1b411b363SPhilipp Reisner /* 2b411b363SPhilipp Reisner drbd_receiver.c 3b411b363SPhilipp Reisner 4b411b363SPhilipp Reisner This file is part of DRBD by Philipp Reisner and Lars Ellenberg. 5b411b363SPhilipp Reisner 6b411b363SPhilipp Reisner Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. 7b411b363SPhilipp Reisner Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>. 8b411b363SPhilipp Reisner Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. 9b411b363SPhilipp Reisner 10b411b363SPhilipp Reisner drbd is free software; you can redistribute it and/or modify 11b411b363SPhilipp Reisner it under the terms of the GNU General Public License as published by 12b411b363SPhilipp Reisner the Free Software Foundation; either version 2, or (at your option) 13b411b363SPhilipp Reisner any later version. 14b411b363SPhilipp Reisner 15b411b363SPhilipp Reisner drbd is distributed in the hope that it will be useful, 16b411b363SPhilipp Reisner but WITHOUT ANY WARRANTY; without even the implied warranty of 17b411b363SPhilipp Reisner MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18b411b363SPhilipp Reisner GNU General Public License for more details. 19b411b363SPhilipp Reisner 20b411b363SPhilipp Reisner You should have received a copy of the GNU General Public License 21b411b363SPhilipp Reisner along with drbd; see the file COPYING. If not, write to 22b411b363SPhilipp Reisner the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 23b411b363SPhilipp Reisner */ 24b411b363SPhilipp Reisner 25b411b363SPhilipp Reisner 26b411b363SPhilipp Reisner #include <linux/module.h> 27b411b363SPhilipp Reisner 28b411b363SPhilipp Reisner #include <asm/uaccess.h> 29b411b363SPhilipp Reisner #include <net/sock.h> 30b411b363SPhilipp Reisner 31b411b363SPhilipp Reisner #include <linux/drbd.h> 32b411b363SPhilipp Reisner #include <linux/fs.h> 33b411b363SPhilipp Reisner #include <linux/file.h> 34b411b363SPhilipp Reisner #include <linux/in.h> 35b411b363SPhilipp Reisner #include <linux/mm.h> 36b411b363SPhilipp Reisner #include <linux/memcontrol.h> 37b411b363SPhilipp Reisner #include <linux/mm_inline.h> 38b411b363SPhilipp Reisner #include <linux/slab.h> 39b411b363SPhilipp Reisner #include <linux/pkt_sched.h> 40b411b363SPhilipp Reisner #define __KERNEL_SYSCALLS__ 41b411b363SPhilipp Reisner #include <linux/unistd.h> 42b411b363SPhilipp Reisner #include <linux/vmalloc.h> 43b411b363SPhilipp Reisner #include <linux/random.h> 44b411b363SPhilipp Reisner #include <linux/string.h> 45b411b363SPhilipp Reisner #include <linux/scatterlist.h> 46b411b363SPhilipp Reisner #include "drbd_int.h" 47b411b363SPhilipp Reisner #include "drbd_req.h" 48b411b363SPhilipp Reisner 49b411b363SPhilipp Reisner #include "drbd_vli.h" 50b411b363SPhilipp Reisner 5177351055SPhilipp Reisner struct packet_info { 5277351055SPhilipp Reisner enum drbd_packet cmd; 53e2857216SAndreas Gruenbacher unsigned int size; 54e2857216SAndreas Gruenbacher unsigned int vnr; 55e658983aSAndreas Gruenbacher void *data; 5677351055SPhilipp Reisner }; 5777351055SPhilipp Reisner 58b411b363SPhilipp Reisner enum finish_epoch { 59b411b363SPhilipp Reisner FE_STILL_LIVE, 60b411b363SPhilipp Reisner FE_DESTROYED, 61b411b363SPhilipp Reisner FE_RECYCLED, 62b411b363SPhilipp Reisner }; 63b411b363SPhilipp Reisner 646038178eSAndreas Gruenbacher static int drbd_do_features(struct drbd_tconn *tconn); 6513e6037dSPhilipp Reisner static int drbd_do_auth(struct drbd_tconn *tconn); 66c141ebdaSPhilipp Reisner static int drbd_disconnected(struct drbd_conf *mdev); 67b411b363SPhilipp Reisner 68b411b363SPhilipp Reisner static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *, struct drbd_epoch *, enum epoch_event); 6999920dc5SAndreas Gruenbacher static int e_end_block(struct drbd_work *, int); 70b411b363SPhilipp Reisner 71b411b363SPhilipp Reisner 72b411b363SPhilipp Reisner #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) 73b411b363SPhilipp Reisner 7445bb912bSLars Ellenberg /* 7545bb912bSLars Ellenberg * some helper functions to deal with single linked page lists, 7645bb912bSLars Ellenberg * page->private being our "next" pointer. 7745bb912bSLars Ellenberg */ 7845bb912bSLars Ellenberg 7945bb912bSLars Ellenberg /* If at least n pages are linked at head, get n pages off. 8045bb912bSLars Ellenberg * Otherwise, don't modify head, and return NULL. 8145bb912bSLars Ellenberg * Locking is the responsibility of the caller. 8245bb912bSLars Ellenberg */ 8345bb912bSLars Ellenberg static struct page *page_chain_del(struct page **head, int n) 8445bb912bSLars Ellenberg { 8545bb912bSLars Ellenberg struct page *page; 8645bb912bSLars Ellenberg struct page *tmp; 8745bb912bSLars Ellenberg 8845bb912bSLars Ellenberg BUG_ON(!n); 8945bb912bSLars Ellenberg BUG_ON(!head); 9045bb912bSLars Ellenberg 9145bb912bSLars Ellenberg page = *head; 9223ce4227SPhilipp Reisner 9323ce4227SPhilipp Reisner if (!page) 9423ce4227SPhilipp Reisner return NULL; 9523ce4227SPhilipp Reisner 9645bb912bSLars Ellenberg while (page) { 9745bb912bSLars Ellenberg tmp = page_chain_next(page); 9845bb912bSLars Ellenberg if (--n == 0) 9945bb912bSLars Ellenberg break; /* found sufficient pages */ 10045bb912bSLars Ellenberg if (tmp == NULL) 10145bb912bSLars Ellenberg /* insufficient pages, don't use any of them. */ 10245bb912bSLars Ellenberg return NULL; 10345bb912bSLars Ellenberg page = tmp; 10445bb912bSLars Ellenberg } 10545bb912bSLars Ellenberg 10645bb912bSLars Ellenberg /* add end of list marker for the returned list */ 10745bb912bSLars Ellenberg set_page_private(page, 0); 10845bb912bSLars Ellenberg /* actual return value, and adjustment of head */ 10945bb912bSLars Ellenberg page = *head; 11045bb912bSLars Ellenberg *head = tmp; 11145bb912bSLars Ellenberg return page; 11245bb912bSLars Ellenberg } 11345bb912bSLars Ellenberg 11445bb912bSLars Ellenberg /* may be used outside of locks to find the tail of a (usually short) 11545bb912bSLars Ellenberg * "private" page chain, before adding it back to a global chain head 11645bb912bSLars Ellenberg * with page_chain_add() under a spinlock. */ 11745bb912bSLars Ellenberg static struct page *page_chain_tail(struct page *page, int *len) 11845bb912bSLars Ellenberg { 11945bb912bSLars Ellenberg struct page *tmp; 12045bb912bSLars Ellenberg int i = 1; 12145bb912bSLars Ellenberg while ((tmp = page_chain_next(page))) 12245bb912bSLars Ellenberg ++i, page = tmp; 12345bb912bSLars Ellenberg if (len) 12445bb912bSLars Ellenberg *len = i; 12545bb912bSLars Ellenberg return page; 12645bb912bSLars Ellenberg } 12745bb912bSLars Ellenberg 12845bb912bSLars Ellenberg static int page_chain_free(struct page *page) 12945bb912bSLars Ellenberg { 13045bb912bSLars Ellenberg struct page *tmp; 13145bb912bSLars Ellenberg int i = 0; 13245bb912bSLars Ellenberg page_chain_for_each_safe(page, tmp) { 13345bb912bSLars Ellenberg put_page(page); 13445bb912bSLars Ellenberg ++i; 13545bb912bSLars Ellenberg } 13645bb912bSLars Ellenberg return i; 13745bb912bSLars Ellenberg } 13845bb912bSLars Ellenberg 13945bb912bSLars Ellenberg static void page_chain_add(struct page **head, 14045bb912bSLars Ellenberg struct page *chain_first, struct page *chain_last) 14145bb912bSLars Ellenberg { 14245bb912bSLars Ellenberg #if 1 14345bb912bSLars Ellenberg struct page *tmp; 14445bb912bSLars Ellenberg tmp = page_chain_tail(chain_first, NULL); 14545bb912bSLars Ellenberg BUG_ON(tmp != chain_last); 14645bb912bSLars Ellenberg #endif 14745bb912bSLars Ellenberg 14845bb912bSLars Ellenberg /* add chain to head */ 14945bb912bSLars Ellenberg set_page_private(chain_last, (unsigned long)*head); 15045bb912bSLars Ellenberg *head = chain_first; 15145bb912bSLars Ellenberg } 15245bb912bSLars Ellenberg 15318c2d522SAndreas Gruenbacher static struct page *__drbd_alloc_pages(struct drbd_conf *mdev, 15418c2d522SAndreas Gruenbacher unsigned int number) 155b411b363SPhilipp Reisner { 156b411b363SPhilipp Reisner struct page *page = NULL; 15745bb912bSLars Ellenberg struct page *tmp = NULL; 15818c2d522SAndreas Gruenbacher unsigned int i = 0; 159b411b363SPhilipp Reisner 160b411b363SPhilipp Reisner /* Yes, testing drbd_pp_vacant outside the lock is racy. 161b411b363SPhilipp Reisner * So what. It saves a spin_lock. */ 16245bb912bSLars Ellenberg if (drbd_pp_vacant >= number) { 163b411b363SPhilipp Reisner spin_lock(&drbd_pp_lock); 16445bb912bSLars Ellenberg page = page_chain_del(&drbd_pp_pool, number); 16545bb912bSLars Ellenberg if (page) 16645bb912bSLars Ellenberg drbd_pp_vacant -= number; 167b411b363SPhilipp Reisner spin_unlock(&drbd_pp_lock); 16845bb912bSLars Ellenberg if (page) 16945bb912bSLars Ellenberg return page; 170b411b363SPhilipp Reisner } 17145bb912bSLars Ellenberg 172b411b363SPhilipp Reisner /* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD 173b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 174b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 17545bb912bSLars Ellenberg for (i = 0; i < number; i++) { 17645bb912bSLars Ellenberg tmp = alloc_page(GFP_TRY); 17745bb912bSLars Ellenberg if (!tmp) 17845bb912bSLars Ellenberg break; 17945bb912bSLars Ellenberg set_page_private(tmp, (unsigned long)page); 18045bb912bSLars Ellenberg page = tmp; 18145bb912bSLars Ellenberg } 18245bb912bSLars Ellenberg 18345bb912bSLars Ellenberg if (i == number) 184b411b363SPhilipp Reisner return page; 18545bb912bSLars Ellenberg 18645bb912bSLars Ellenberg /* Not enough pages immediately available this time. 187c37c8ecfSAndreas Gruenbacher * No need to jump around here, drbd_alloc_pages will retry this 18845bb912bSLars Ellenberg * function "soon". */ 18945bb912bSLars Ellenberg if (page) { 19045bb912bSLars Ellenberg tmp = page_chain_tail(page, NULL); 19145bb912bSLars Ellenberg spin_lock(&drbd_pp_lock); 19245bb912bSLars Ellenberg page_chain_add(&drbd_pp_pool, page, tmp); 19345bb912bSLars Ellenberg drbd_pp_vacant += i; 19445bb912bSLars Ellenberg spin_unlock(&drbd_pp_lock); 19545bb912bSLars Ellenberg } 19645bb912bSLars Ellenberg return NULL; 197b411b363SPhilipp Reisner } 198b411b363SPhilipp Reisner 199a990be46SAndreas Gruenbacher static void reclaim_finished_net_peer_reqs(struct drbd_conf *mdev, 200a990be46SAndreas Gruenbacher struct list_head *to_be_freed) 201b411b363SPhilipp Reisner { 202db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 203b411b363SPhilipp Reisner struct list_head *le, *tle; 204b411b363SPhilipp Reisner 205b411b363SPhilipp Reisner /* The EEs are always appended to the end of the list. Since 206b411b363SPhilipp Reisner they are sent in order over the wire, they have to finish 207b411b363SPhilipp Reisner in order. As soon as we see the first not finished we can 208b411b363SPhilipp Reisner stop to examine the list... */ 209b411b363SPhilipp Reisner 210b411b363SPhilipp Reisner list_for_each_safe(le, tle, &mdev->net_ee) { 211db830c46SAndreas Gruenbacher peer_req = list_entry(le, struct drbd_peer_request, w.list); 212045417f7SAndreas Gruenbacher if (drbd_peer_req_has_active_page(peer_req)) 213b411b363SPhilipp Reisner break; 214b411b363SPhilipp Reisner list_move(le, to_be_freed); 215b411b363SPhilipp Reisner } 216b411b363SPhilipp Reisner } 217b411b363SPhilipp Reisner 218b411b363SPhilipp Reisner static void drbd_kick_lo_and_reclaim_net(struct drbd_conf *mdev) 219b411b363SPhilipp Reisner { 220b411b363SPhilipp Reisner LIST_HEAD(reclaimed); 221db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req, *t; 222b411b363SPhilipp Reisner 22387eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 224a990be46SAndreas Gruenbacher reclaim_finished_net_peer_reqs(mdev, &reclaimed); 22587eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 226b411b363SPhilipp Reisner 227db830c46SAndreas Gruenbacher list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) 2283967deb1SAndreas Gruenbacher drbd_free_net_peer_req(mdev, peer_req); 229b411b363SPhilipp Reisner } 230b411b363SPhilipp Reisner 231b411b363SPhilipp Reisner /** 232c37c8ecfSAndreas Gruenbacher * drbd_alloc_pages() - Returns @number pages, retries forever (or until signalled) 233b411b363SPhilipp Reisner * @mdev: DRBD device. 23445bb912bSLars Ellenberg * @number: number of pages requested 23545bb912bSLars Ellenberg * @retry: whether to retry, if not enough pages are available right now 236b411b363SPhilipp Reisner * 23745bb912bSLars Ellenberg * Tries to allocate number pages, first from our own page pool, then from 23845bb912bSLars Ellenberg * the kernel, unless this allocation would exceed the max_buffers setting. 23945bb912bSLars Ellenberg * Possibly retry until DRBD frees sufficient pages somewhere else. 24045bb912bSLars Ellenberg * 24145bb912bSLars Ellenberg * Returns a page chain linked via page->private. 242b411b363SPhilipp Reisner */ 243c37c8ecfSAndreas Gruenbacher struct page *drbd_alloc_pages(struct drbd_conf *mdev, unsigned int number, 244c37c8ecfSAndreas Gruenbacher bool retry) 245b411b363SPhilipp Reisner { 246b411b363SPhilipp Reisner struct page *page = NULL; 24744ed167dSPhilipp Reisner struct net_conf *nc; 248b411b363SPhilipp Reisner DEFINE_WAIT(wait); 24944ed167dSPhilipp Reisner int mxb; 250b411b363SPhilipp Reisner 25145bb912bSLars Ellenberg /* Yes, we may run up to @number over max_buffers. If we 25245bb912bSLars Ellenberg * follow it strictly, the admin will get it wrong anyways. */ 25344ed167dSPhilipp Reisner rcu_read_lock(); 25444ed167dSPhilipp Reisner nc = rcu_dereference(mdev->tconn->net_conf); 25544ed167dSPhilipp Reisner mxb = nc ? nc->max_buffers : 1000000; 25644ed167dSPhilipp Reisner rcu_read_unlock(); 25744ed167dSPhilipp Reisner 25844ed167dSPhilipp Reisner if (atomic_read(&mdev->pp_in_use) < mxb) 25918c2d522SAndreas Gruenbacher page = __drbd_alloc_pages(mdev, number); 260b411b363SPhilipp Reisner 26145bb912bSLars Ellenberg while (page == NULL) { 262b411b363SPhilipp Reisner prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE); 263b411b363SPhilipp Reisner 264b411b363SPhilipp Reisner drbd_kick_lo_and_reclaim_net(mdev); 265b411b363SPhilipp Reisner 26644ed167dSPhilipp Reisner if (atomic_read(&mdev->pp_in_use) < mxb) { 26718c2d522SAndreas Gruenbacher page = __drbd_alloc_pages(mdev, number); 268b411b363SPhilipp Reisner if (page) 269b411b363SPhilipp Reisner break; 270b411b363SPhilipp Reisner } 271b411b363SPhilipp Reisner 272b411b363SPhilipp Reisner if (!retry) 273b411b363SPhilipp Reisner break; 274b411b363SPhilipp Reisner 275b411b363SPhilipp Reisner if (signal_pending(current)) { 276c37c8ecfSAndreas Gruenbacher dev_warn(DEV, "drbd_alloc_pages interrupted!\n"); 277b411b363SPhilipp Reisner break; 278b411b363SPhilipp Reisner } 279b411b363SPhilipp Reisner 280b411b363SPhilipp Reisner schedule(); 281b411b363SPhilipp Reisner } 282b411b363SPhilipp Reisner finish_wait(&drbd_pp_wait, &wait); 283b411b363SPhilipp Reisner 28445bb912bSLars Ellenberg if (page) 28545bb912bSLars Ellenberg atomic_add(number, &mdev->pp_in_use); 286b411b363SPhilipp Reisner return page; 287b411b363SPhilipp Reisner } 288b411b363SPhilipp Reisner 289c37c8ecfSAndreas Gruenbacher /* Must not be used from irq, as that may deadlock: see drbd_alloc_pages. 29087eeee41SPhilipp Reisner * Is also used from inside an other spin_lock_irq(&mdev->tconn->req_lock); 29145bb912bSLars Ellenberg * Either links the page chain back to the global pool, 29245bb912bSLars Ellenberg * or returns all pages to the system. */ 2935cc287e0SAndreas Gruenbacher static void drbd_free_pages(struct drbd_conf *mdev, struct page *page, int is_net) 294b411b363SPhilipp Reisner { 295435f0740SLars Ellenberg atomic_t *a = is_net ? &mdev->pp_in_use_by_net : &mdev->pp_in_use; 296b411b363SPhilipp Reisner int i; 297435f0740SLars Ellenberg 2981816a2b4SLars Ellenberg if (drbd_pp_vacant > (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * minor_count) 29945bb912bSLars Ellenberg i = page_chain_free(page); 30045bb912bSLars Ellenberg else { 30145bb912bSLars Ellenberg struct page *tmp; 30245bb912bSLars Ellenberg tmp = page_chain_tail(page, &i); 303b411b363SPhilipp Reisner spin_lock(&drbd_pp_lock); 30445bb912bSLars Ellenberg page_chain_add(&drbd_pp_pool, page, tmp); 30545bb912bSLars Ellenberg drbd_pp_vacant += i; 306b411b363SPhilipp Reisner spin_unlock(&drbd_pp_lock); 307b411b363SPhilipp Reisner } 308435f0740SLars Ellenberg i = atomic_sub_return(i, a); 30945bb912bSLars Ellenberg if (i < 0) 310435f0740SLars Ellenberg dev_warn(DEV, "ASSERTION FAILED: %s: %d < 0\n", 311435f0740SLars Ellenberg is_net ? "pp_in_use_by_net" : "pp_in_use", i); 312b411b363SPhilipp Reisner wake_up(&drbd_pp_wait); 313b411b363SPhilipp Reisner } 314b411b363SPhilipp Reisner 315b411b363SPhilipp Reisner /* 316b411b363SPhilipp Reisner You need to hold the req_lock: 317b411b363SPhilipp Reisner _drbd_wait_ee_list_empty() 318b411b363SPhilipp Reisner 319b411b363SPhilipp Reisner You must not have the req_lock: 3203967deb1SAndreas Gruenbacher drbd_free_peer_req() 3210db55363SAndreas Gruenbacher drbd_alloc_peer_req() 3227721f567SAndreas Gruenbacher drbd_free_peer_reqs() 323b411b363SPhilipp Reisner drbd_ee_fix_bhs() 324a990be46SAndreas Gruenbacher drbd_finish_peer_reqs() 325b411b363SPhilipp Reisner drbd_clear_done_ee() 326b411b363SPhilipp Reisner drbd_wait_ee_list_empty() 327b411b363SPhilipp Reisner */ 328b411b363SPhilipp Reisner 329f6ffca9fSAndreas Gruenbacher struct drbd_peer_request * 3300db55363SAndreas Gruenbacher drbd_alloc_peer_req(struct drbd_conf *mdev, u64 id, sector_t sector, 331f6ffca9fSAndreas Gruenbacher unsigned int data_size, gfp_t gfp_mask) __must_hold(local) 332b411b363SPhilipp Reisner { 333db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 334b411b363SPhilipp Reisner struct page *page; 33545bb912bSLars Ellenberg unsigned nr_pages = (data_size + PAGE_SIZE -1) >> PAGE_SHIFT; 336b411b363SPhilipp Reisner 3370cf9d27eSAndreas Gruenbacher if (drbd_insert_fault(mdev, DRBD_FAULT_AL_EE)) 338b411b363SPhilipp Reisner return NULL; 339b411b363SPhilipp Reisner 340db830c46SAndreas Gruenbacher peer_req = mempool_alloc(drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM); 341db830c46SAndreas Gruenbacher if (!peer_req) { 342b411b363SPhilipp Reisner if (!(gfp_mask & __GFP_NOWARN)) 3430db55363SAndreas Gruenbacher dev_err(DEV, "%s: allocation failed\n", __func__); 344b411b363SPhilipp Reisner return NULL; 345b411b363SPhilipp Reisner } 346b411b363SPhilipp Reisner 347c37c8ecfSAndreas Gruenbacher page = drbd_alloc_pages(mdev, nr_pages, (gfp_mask & __GFP_WAIT)); 34845bb912bSLars Ellenberg if (!page) 34945bb912bSLars Ellenberg goto fail; 350b411b363SPhilipp Reisner 351db830c46SAndreas Gruenbacher drbd_clear_interval(&peer_req->i); 352db830c46SAndreas Gruenbacher peer_req->i.size = data_size; 353db830c46SAndreas Gruenbacher peer_req->i.sector = sector; 354db830c46SAndreas Gruenbacher peer_req->i.local = false; 355db830c46SAndreas Gruenbacher peer_req->i.waiting = false; 35653840641SAndreas Gruenbacher 357db830c46SAndreas Gruenbacher peer_req->epoch = NULL; 358a21e9298SPhilipp Reisner peer_req->w.mdev = mdev; 359db830c46SAndreas Gruenbacher peer_req->pages = page; 360db830c46SAndreas Gruenbacher atomic_set(&peer_req->pending_bios, 0); 361db830c46SAndreas Gruenbacher peer_req->flags = 0; 3629a8e7753SAndreas Gruenbacher /* 3639a8e7753SAndreas Gruenbacher * The block_id is opaque to the receiver. It is not endianness 3649a8e7753SAndreas Gruenbacher * converted, and sent back to the sender unchanged. 3659a8e7753SAndreas Gruenbacher */ 366db830c46SAndreas Gruenbacher peer_req->block_id = id; 367b411b363SPhilipp Reisner 368db830c46SAndreas Gruenbacher return peer_req; 369b411b363SPhilipp Reisner 37045bb912bSLars Ellenberg fail: 371db830c46SAndreas Gruenbacher mempool_free(peer_req, drbd_ee_mempool); 372b411b363SPhilipp Reisner return NULL; 373b411b363SPhilipp Reisner } 374b411b363SPhilipp Reisner 3753967deb1SAndreas Gruenbacher void __drbd_free_peer_req(struct drbd_conf *mdev, struct drbd_peer_request *peer_req, 376f6ffca9fSAndreas Gruenbacher int is_net) 377b411b363SPhilipp Reisner { 378db830c46SAndreas Gruenbacher if (peer_req->flags & EE_HAS_DIGEST) 379db830c46SAndreas Gruenbacher kfree(peer_req->digest); 3805cc287e0SAndreas Gruenbacher drbd_free_pages(mdev, peer_req->pages, is_net); 381db830c46SAndreas Gruenbacher D_ASSERT(atomic_read(&peer_req->pending_bios) == 0); 382db830c46SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&peer_req->i)); 383db830c46SAndreas Gruenbacher mempool_free(peer_req, drbd_ee_mempool); 384b411b363SPhilipp Reisner } 385b411b363SPhilipp Reisner 3867721f567SAndreas Gruenbacher int drbd_free_peer_reqs(struct drbd_conf *mdev, struct list_head *list) 387b411b363SPhilipp Reisner { 388b411b363SPhilipp Reisner LIST_HEAD(work_list); 389db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req, *t; 390b411b363SPhilipp Reisner int count = 0; 391435f0740SLars Ellenberg int is_net = list == &mdev->net_ee; 392b411b363SPhilipp Reisner 39387eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 394b411b363SPhilipp Reisner list_splice_init(list, &work_list); 39587eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 396b411b363SPhilipp Reisner 397db830c46SAndreas Gruenbacher list_for_each_entry_safe(peer_req, t, &work_list, w.list) { 3983967deb1SAndreas Gruenbacher __drbd_free_peer_req(mdev, peer_req, is_net); 399b411b363SPhilipp Reisner count++; 400b411b363SPhilipp Reisner } 401b411b363SPhilipp Reisner return count; 402b411b363SPhilipp Reisner } 403b411b363SPhilipp Reisner 404a990be46SAndreas Gruenbacher /* 405a990be46SAndreas Gruenbacher * See also comments in _req_mod(,BARRIER_ACKED) and receive_Barrier. 406b411b363SPhilipp Reisner */ 407a990be46SAndreas Gruenbacher static int drbd_finish_peer_reqs(struct drbd_conf *mdev) 408b411b363SPhilipp Reisner { 409b411b363SPhilipp Reisner LIST_HEAD(work_list); 410b411b363SPhilipp Reisner LIST_HEAD(reclaimed); 411db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req, *t; 412e2b3032bSAndreas Gruenbacher int err = 0; 413b411b363SPhilipp Reisner 41487eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 415a990be46SAndreas Gruenbacher reclaim_finished_net_peer_reqs(mdev, &reclaimed); 416b411b363SPhilipp Reisner list_splice_init(&mdev->done_ee, &work_list); 41787eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 418b411b363SPhilipp Reisner 419db830c46SAndreas Gruenbacher list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) 4203967deb1SAndreas Gruenbacher drbd_free_net_peer_req(mdev, peer_req); 421b411b363SPhilipp Reisner 422b411b363SPhilipp Reisner /* possible callbacks here: 4237be8da07SAndreas Gruenbacher * e_end_block, and e_end_resync_block, e_send_discard_write. 424b411b363SPhilipp Reisner * all ignore the last argument. 425b411b363SPhilipp Reisner */ 426db830c46SAndreas Gruenbacher list_for_each_entry_safe(peer_req, t, &work_list, w.list) { 427e2b3032bSAndreas Gruenbacher int err2; 428e2b3032bSAndreas Gruenbacher 429b411b363SPhilipp Reisner /* list_del not necessary, next/prev members not touched */ 430e2b3032bSAndreas Gruenbacher err2 = peer_req->w.cb(&peer_req->w, !!err); 431e2b3032bSAndreas Gruenbacher if (!err) 432e2b3032bSAndreas Gruenbacher err = err2; 4333967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 434b411b363SPhilipp Reisner } 435b411b363SPhilipp Reisner wake_up(&mdev->ee_wait); 436b411b363SPhilipp Reisner 437e2b3032bSAndreas Gruenbacher return err; 438b411b363SPhilipp Reisner } 439b411b363SPhilipp Reisner 440d4da1537SAndreas Gruenbacher static void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, 441d4da1537SAndreas Gruenbacher struct list_head *head) 442b411b363SPhilipp Reisner { 443b411b363SPhilipp Reisner DEFINE_WAIT(wait); 444b411b363SPhilipp Reisner 445b411b363SPhilipp Reisner /* avoids spin_lock/unlock 446b411b363SPhilipp Reisner * and calling prepare_to_wait in the fast path */ 447b411b363SPhilipp Reisner while (!list_empty(head)) { 448b411b363SPhilipp Reisner prepare_to_wait(&mdev->ee_wait, &wait, TASK_UNINTERRUPTIBLE); 44987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 4507eaceaccSJens Axboe io_schedule(); 451b411b363SPhilipp Reisner finish_wait(&mdev->ee_wait, &wait); 45287eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 453b411b363SPhilipp Reisner } 454b411b363SPhilipp Reisner } 455b411b363SPhilipp Reisner 456d4da1537SAndreas Gruenbacher static void drbd_wait_ee_list_empty(struct drbd_conf *mdev, 457d4da1537SAndreas Gruenbacher struct list_head *head) 458b411b363SPhilipp Reisner { 45987eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 460b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, head); 46187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 462b411b363SPhilipp Reisner } 463b411b363SPhilipp Reisner 464b411b363SPhilipp Reisner /* see also kernel_accept; which is only present since 2.6.18. 465b411b363SPhilipp Reisner * also we want to log which part of it failed, exactly */ 4667653620dSPhilipp Reisner static int drbd_accept(const char **what, struct socket *sock, struct socket **newsock) 467b411b363SPhilipp Reisner { 468b411b363SPhilipp Reisner struct sock *sk = sock->sk; 469b411b363SPhilipp Reisner int err = 0; 470b411b363SPhilipp Reisner 471b411b363SPhilipp Reisner *what = "listen"; 472b411b363SPhilipp Reisner err = sock->ops->listen(sock, 5); 473b411b363SPhilipp Reisner if (err < 0) 474b411b363SPhilipp Reisner goto out; 475b411b363SPhilipp Reisner 476b411b363SPhilipp Reisner *what = "sock_create_lite"; 477b411b363SPhilipp Reisner err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, 478b411b363SPhilipp Reisner newsock); 479b411b363SPhilipp Reisner if (err < 0) 480b411b363SPhilipp Reisner goto out; 481b411b363SPhilipp Reisner 482b411b363SPhilipp Reisner *what = "accept"; 483b411b363SPhilipp Reisner err = sock->ops->accept(sock, *newsock, 0); 484b411b363SPhilipp Reisner if (err < 0) { 485b411b363SPhilipp Reisner sock_release(*newsock); 486b411b363SPhilipp Reisner *newsock = NULL; 487b411b363SPhilipp Reisner goto out; 488b411b363SPhilipp Reisner } 489b411b363SPhilipp Reisner (*newsock)->ops = sock->ops; 490b411b363SPhilipp Reisner 491b411b363SPhilipp Reisner out: 492b411b363SPhilipp Reisner return err; 493b411b363SPhilipp Reisner } 494b411b363SPhilipp Reisner 495dbd9eea0SPhilipp Reisner static int drbd_recv_short(struct socket *sock, void *buf, size_t size, int flags) 496b411b363SPhilipp Reisner { 497b411b363SPhilipp Reisner mm_segment_t oldfs; 498b411b363SPhilipp Reisner struct kvec iov = { 499b411b363SPhilipp Reisner .iov_base = buf, 500b411b363SPhilipp Reisner .iov_len = size, 501b411b363SPhilipp Reisner }; 502b411b363SPhilipp Reisner struct msghdr msg = { 503b411b363SPhilipp Reisner .msg_iovlen = 1, 504b411b363SPhilipp Reisner .msg_iov = (struct iovec *)&iov, 505b411b363SPhilipp Reisner .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) 506b411b363SPhilipp Reisner }; 507b411b363SPhilipp Reisner int rv; 508b411b363SPhilipp Reisner 509b411b363SPhilipp Reisner oldfs = get_fs(); 510b411b363SPhilipp Reisner set_fs(KERNEL_DS); 511b411b363SPhilipp Reisner rv = sock_recvmsg(sock, &msg, size, msg.msg_flags); 512b411b363SPhilipp Reisner set_fs(oldfs); 513b411b363SPhilipp Reisner 514b411b363SPhilipp Reisner return rv; 515b411b363SPhilipp Reisner } 516b411b363SPhilipp Reisner 517de0ff338SPhilipp Reisner static int drbd_recv(struct drbd_tconn *tconn, void *buf, size_t size) 518b411b363SPhilipp Reisner { 519b411b363SPhilipp Reisner mm_segment_t oldfs; 520b411b363SPhilipp Reisner struct kvec iov = { 521b411b363SPhilipp Reisner .iov_base = buf, 522b411b363SPhilipp Reisner .iov_len = size, 523b411b363SPhilipp Reisner }; 524b411b363SPhilipp Reisner struct msghdr msg = { 525b411b363SPhilipp Reisner .msg_iovlen = 1, 526b411b363SPhilipp Reisner .msg_iov = (struct iovec *)&iov, 527b411b363SPhilipp Reisner .msg_flags = MSG_WAITALL | MSG_NOSIGNAL 528b411b363SPhilipp Reisner }; 529b411b363SPhilipp Reisner int rv; 530b411b363SPhilipp Reisner 531b411b363SPhilipp Reisner oldfs = get_fs(); 532b411b363SPhilipp Reisner set_fs(KERNEL_DS); 533b411b363SPhilipp Reisner 534b411b363SPhilipp Reisner for (;;) { 535de0ff338SPhilipp Reisner rv = sock_recvmsg(tconn->data.socket, &msg, size, msg.msg_flags); 536b411b363SPhilipp Reisner if (rv == size) 537b411b363SPhilipp Reisner break; 538b411b363SPhilipp Reisner 539b411b363SPhilipp Reisner /* Note: 540b411b363SPhilipp Reisner * ECONNRESET other side closed the connection 541b411b363SPhilipp Reisner * ERESTARTSYS (on sock) we got a signal 542b411b363SPhilipp Reisner */ 543b411b363SPhilipp Reisner 544b411b363SPhilipp Reisner if (rv < 0) { 545b411b363SPhilipp Reisner if (rv == -ECONNRESET) 546de0ff338SPhilipp Reisner conn_info(tconn, "sock was reset by peer\n"); 547b411b363SPhilipp Reisner else if (rv != -ERESTARTSYS) 548de0ff338SPhilipp Reisner conn_err(tconn, "sock_recvmsg returned %d\n", rv); 549b411b363SPhilipp Reisner break; 550b411b363SPhilipp Reisner } else if (rv == 0) { 551de0ff338SPhilipp Reisner conn_info(tconn, "sock was shut down by peer\n"); 552b411b363SPhilipp Reisner break; 553b411b363SPhilipp Reisner } else { 554b411b363SPhilipp Reisner /* signal came in, or peer/link went down, 555b411b363SPhilipp Reisner * after we read a partial message 556b411b363SPhilipp Reisner */ 557b411b363SPhilipp Reisner /* D_ASSERT(signal_pending(current)); */ 558b411b363SPhilipp Reisner break; 559b411b363SPhilipp Reisner } 560b411b363SPhilipp Reisner }; 561b411b363SPhilipp Reisner 562b411b363SPhilipp Reisner set_fs(oldfs); 563b411b363SPhilipp Reisner 564b411b363SPhilipp Reisner if (rv != size) 565bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_BROKEN_PIPE), CS_HARD); 566b411b363SPhilipp Reisner 567b411b363SPhilipp Reisner return rv; 568b411b363SPhilipp Reisner } 569b411b363SPhilipp Reisner 570c6967746SAndreas Gruenbacher static int drbd_recv_all(struct drbd_tconn *tconn, void *buf, size_t size) 571c6967746SAndreas Gruenbacher { 572c6967746SAndreas Gruenbacher int err; 573c6967746SAndreas Gruenbacher 574c6967746SAndreas Gruenbacher err = drbd_recv(tconn, buf, size); 575c6967746SAndreas Gruenbacher if (err != size) { 576c6967746SAndreas Gruenbacher if (err >= 0) 577c6967746SAndreas Gruenbacher err = -EIO; 578c6967746SAndreas Gruenbacher } else 579c6967746SAndreas Gruenbacher err = 0; 580c6967746SAndreas Gruenbacher return err; 581c6967746SAndreas Gruenbacher } 582c6967746SAndreas Gruenbacher 583a5c31904SAndreas Gruenbacher static int drbd_recv_all_warn(struct drbd_tconn *tconn, void *buf, size_t size) 584a5c31904SAndreas Gruenbacher { 585a5c31904SAndreas Gruenbacher int err; 586a5c31904SAndreas Gruenbacher 587a5c31904SAndreas Gruenbacher err = drbd_recv_all(tconn, buf, size); 588a5c31904SAndreas Gruenbacher if (err && !signal_pending(current)) 589a5c31904SAndreas Gruenbacher conn_warn(tconn, "short read (expected size %d)\n", (int)size); 590a5c31904SAndreas Gruenbacher return err; 591a5c31904SAndreas Gruenbacher } 592a5c31904SAndreas Gruenbacher 5935dbf1673SLars Ellenberg /* quoting tcp(7): 5945dbf1673SLars Ellenberg * On individual connections, the socket buffer size must be set prior to the 5955dbf1673SLars Ellenberg * listen(2) or connect(2) calls in order to have it take effect. 5965dbf1673SLars Ellenberg * This is our wrapper to do so. 5975dbf1673SLars Ellenberg */ 5985dbf1673SLars Ellenberg static void drbd_setbufsize(struct socket *sock, unsigned int snd, 5995dbf1673SLars Ellenberg unsigned int rcv) 6005dbf1673SLars Ellenberg { 6015dbf1673SLars Ellenberg /* open coded SO_SNDBUF, SO_RCVBUF */ 6025dbf1673SLars Ellenberg if (snd) { 6035dbf1673SLars Ellenberg sock->sk->sk_sndbuf = snd; 6045dbf1673SLars Ellenberg sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 6055dbf1673SLars Ellenberg } 6065dbf1673SLars Ellenberg if (rcv) { 6075dbf1673SLars Ellenberg sock->sk->sk_rcvbuf = rcv; 6085dbf1673SLars Ellenberg sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 6095dbf1673SLars Ellenberg } 6105dbf1673SLars Ellenberg } 6115dbf1673SLars Ellenberg 612eac3e990SPhilipp Reisner static struct socket *drbd_try_connect(struct drbd_tconn *tconn) 613b411b363SPhilipp Reisner { 614b411b363SPhilipp Reisner const char *what; 615b411b363SPhilipp Reisner struct socket *sock; 616b411b363SPhilipp Reisner struct sockaddr_in6 src_in6; 61744ed167dSPhilipp Reisner struct sockaddr_in6 peer_in6; 61844ed167dSPhilipp Reisner struct net_conf *nc; 61944ed167dSPhilipp Reisner int err, peer_addr_len, my_addr_len; 62069ef82deSAndreas Gruenbacher int sndbuf_size, rcvbuf_size, connect_int; 621b411b363SPhilipp Reisner int disconnect_on_error = 1; 622b411b363SPhilipp Reisner 62344ed167dSPhilipp Reisner rcu_read_lock(); 62444ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 62544ed167dSPhilipp Reisner if (!nc) { 62644ed167dSPhilipp Reisner rcu_read_unlock(); 627b411b363SPhilipp Reisner return NULL; 62844ed167dSPhilipp Reisner } 62944ed167dSPhilipp Reisner sndbuf_size = nc->sndbuf_size; 63044ed167dSPhilipp Reisner rcvbuf_size = nc->rcvbuf_size; 63169ef82deSAndreas Gruenbacher connect_int = nc->connect_int; 632089c075dSAndreas Gruenbacher rcu_read_unlock(); 63344ed167dSPhilipp Reisner 634089c075dSAndreas Gruenbacher my_addr_len = min_t(int, tconn->my_addr_len, sizeof(src_in6)); 635089c075dSAndreas Gruenbacher memcpy(&src_in6, &tconn->my_addr, my_addr_len); 63644ed167dSPhilipp Reisner 637089c075dSAndreas Gruenbacher if (((struct sockaddr *)&tconn->my_addr)->sa_family == AF_INET6) 63844ed167dSPhilipp Reisner src_in6.sin6_port = 0; 63944ed167dSPhilipp Reisner else 64044ed167dSPhilipp Reisner ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ 64144ed167dSPhilipp Reisner 642089c075dSAndreas Gruenbacher peer_addr_len = min_t(int, tconn->peer_addr_len, sizeof(src_in6)); 643089c075dSAndreas Gruenbacher memcpy(&peer_in6, &tconn->peer_addr, peer_addr_len); 644b411b363SPhilipp Reisner 645b411b363SPhilipp Reisner what = "sock_create_kern"; 64644ed167dSPhilipp Reisner err = sock_create_kern(((struct sockaddr *)&src_in6)->sa_family, 647b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &sock); 648b411b363SPhilipp Reisner if (err < 0) { 649b411b363SPhilipp Reisner sock = NULL; 650b411b363SPhilipp Reisner goto out; 651b411b363SPhilipp Reisner } 652b411b363SPhilipp Reisner 653b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = 65469ef82deSAndreas Gruenbacher sock->sk->sk_sndtimeo = connect_int * HZ; 65544ed167dSPhilipp Reisner drbd_setbufsize(sock, sndbuf_size, rcvbuf_size); 656b411b363SPhilipp Reisner 657b411b363SPhilipp Reisner /* explicitly bind to the configured IP as source IP 658b411b363SPhilipp Reisner * for the outgoing connections. 659b411b363SPhilipp Reisner * This is needed for multihomed hosts and to be 660b411b363SPhilipp Reisner * able to use lo: interfaces for drbd. 661b411b363SPhilipp Reisner * Make sure to use 0 as port number, so linux selects 662b411b363SPhilipp Reisner * a free one dynamically. 663b411b363SPhilipp Reisner */ 664b411b363SPhilipp Reisner what = "bind before connect"; 66544ed167dSPhilipp Reisner err = sock->ops->bind(sock, (struct sockaddr *) &src_in6, my_addr_len); 666b411b363SPhilipp Reisner if (err < 0) 667b411b363SPhilipp Reisner goto out; 668b411b363SPhilipp Reisner 669b411b363SPhilipp Reisner /* connect may fail, peer not yet available. 670b411b363SPhilipp Reisner * stay C_WF_CONNECTION, don't go Disconnecting! */ 671b411b363SPhilipp Reisner disconnect_on_error = 0; 672b411b363SPhilipp Reisner what = "connect"; 67344ed167dSPhilipp Reisner err = sock->ops->connect(sock, (struct sockaddr *) &peer_in6, peer_addr_len, 0); 674b411b363SPhilipp Reisner 675b411b363SPhilipp Reisner out: 676b411b363SPhilipp Reisner if (err < 0) { 677b411b363SPhilipp Reisner if (sock) { 678b411b363SPhilipp Reisner sock_release(sock); 679b411b363SPhilipp Reisner sock = NULL; 680b411b363SPhilipp Reisner } 681b411b363SPhilipp Reisner switch (-err) { 682b411b363SPhilipp Reisner /* timeout, busy, signal pending */ 683b411b363SPhilipp Reisner case ETIMEDOUT: case EAGAIN: case EINPROGRESS: 684b411b363SPhilipp Reisner case EINTR: case ERESTARTSYS: 685b411b363SPhilipp Reisner /* peer not (yet) available, network problem */ 686b411b363SPhilipp Reisner case ECONNREFUSED: case ENETUNREACH: 687b411b363SPhilipp Reisner case EHOSTDOWN: case EHOSTUNREACH: 688b411b363SPhilipp Reisner disconnect_on_error = 0; 689b411b363SPhilipp Reisner break; 690b411b363SPhilipp Reisner default: 691eac3e990SPhilipp Reisner conn_err(tconn, "%s failed, err = %d\n", what, err); 692b411b363SPhilipp Reisner } 693b411b363SPhilipp Reisner if (disconnect_on_error) 694bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 695b411b363SPhilipp Reisner } 69644ed167dSPhilipp Reisner 697b411b363SPhilipp Reisner return sock; 698b411b363SPhilipp Reisner } 699b411b363SPhilipp Reisner 7007653620dSPhilipp Reisner static struct socket *drbd_wait_for_connect(struct drbd_tconn *tconn) 701b411b363SPhilipp Reisner { 70244ed167dSPhilipp Reisner int timeo, err, my_addr_len; 70369ef82deSAndreas Gruenbacher int sndbuf_size, rcvbuf_size, connect_int; 704b411b363SPhilipp Reisner struct socket *s_estab = NULL, *s_listen; 70544ed167dSPhilipp Reisner struct sockaddr_in6 my_addr; 70644ed167dSPhilipp Reisner struct net_conf *nc; 707b411b363SPhilipp Reisner const char *what; 708b411b363SPhilipp Reisner 70944ed167dSPhilipp Reisner rcu_read_lock(); 71044ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 71144ed167dSPhilipp Reisner if (!nc) { 71244ed167dSPhilipp Reisner rcu_read_unlock(); 713b411b363SPhilipp Reisner return NULL; 71444ed167dSPhilipp Reisner } 71544ed167dSPhilipp Reisner sndbuf_size = nc->sndbuf_size; 71644ed167dSPhilipp Reisner rcvbuf_size = nc->rcvbuf_size; 71769ef82deSAndreas Gruenbacher connect_int = nc->connect_int; 71844ed167dSPhilipp Reisner rcu_read_unlock(); 719b411b363SPhilipp Reisner 720089c075dSAndreas Gruenbacher my_addr_len = min_t(int, tconn->my_addr_len, sizeof(struct sockaddr_in6)); 721089c075dSAndreas Gruenbacher memcpy(&my_addr, &tconn->my_addr, my_addr_len); 722089c075dSAndreas Gruenbacher 723b411b363SPhilipp Reisner what = "sock_create_kern"; 72444ed167dSPhilipp Reisner err = sock_create_kern(((struct sockaddr *)&my_addr)->sa_family, 725b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &s_listen); 726b411b363SPhilipp Reisner if (err) { 727b411b363SPhilipp Reisner s_listen = NULL; 728b411b363SPhilipp Reisner goto out; 729b411b363SPhilipp Reisner } 730b411b363SPhilipp Reisner 73169ef82deSAndreas Gruenbacher timeo = connect_int * HZ; 732b411b363SPhilipp Reisner timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */ 733b411b363SPhilipp Reisner 734b411b363SPhilipp Reisner s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */ 735b411b363SPhilipp Reisner s_listen->sk->sk_rcvtimeo = timeo; 736b411b363SPhilipp Reisner s_listen->sk->sk_sndtimeo = timeo; 73744ed167dSPhilipp Reisner drbd_setbufsize(s_listen, sndbuf_size, rcvbuf_size); 738b411b363SPhilipp Reisner 739b411b363SPhilipp Reisner what = "bind before listen"; 74044ed167dSPhilipp Reisner err = s_listen->ops->bind(s_listen, (struct sockaddr *)&my_addr, my_addr_len); 741b411b363SPhilipp Reisner if (err < 0) 742b411b363SPhilipp Reisner goto out; 743b411b363SPhilipp Reisner 7447653620dSPhilipp Reisner err = drbd_accept(&what, s_listen, &s_estab); 745b411b363SPhilipp Reisner 746b411b363SPhilipp Reisner out: 747b411b363SPhilipp Reisner if (s_listen) 748b411b363SPhilipp Reisner sock_release(s_listen); 749b411b363SPhilipp Reisner if (err < 0) { 750b411b363SPhilipp Reisner if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { 7517653620dSPhilipp Reisner conn_err(tconn, "%s failed, err = %d\n", what, err); 752bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 753b411b363SPhilipp Reisner } 754b411b363SPhilipp Reisner } 755b411b363SPhilipp Reisner 756b411b363SPhilipp Reisner return s_estab; 757b411b363SPhilipp Reisner } 758b411b363SPhilipp Reisner 759e658983aSAndreas Gruenbacher static int decode_header(struct drbd_tconn *, void *, struct packet_info *); 760b411b363SPhilipp Reisner 7619f5bdc33SAndreas Gruenbacher static int send_first_packet(struct drbd_tconn *tconn, struct drbd_socket *sock, 7629f5bdc33SAndreas Gruenbacher enum drbd_packet cmd) 7639f5bdc33SAndreas Gruenbacher { 7649f5bdc33SAndreas Gruenbacher if (!conn_prepare_command(tconn, sock)) 7659f5bdc33SAndreas Gruenbacher return -EIO; 766e658983aSAndreas Gruenbacher return conn_send_command(tconn, sock, cmd, 0, NULL, 0); 767b411b363SPhilipp Reisner } 768b411b363SPhilipp Reisner 7699f5bdc33SAndreas Gruenbacher static int receive_first_packet(struct drbd_tconn *tconn, struct socket *sock) 770b411b363SPhilipp Reisner { 7719f5bdc33SAndreas Gruenbacher unsigned int header_size = drbd_header_size(tconn); 7729f5bdc33SAndreas Gruenbacher struct packet_info pi; 7739f5bdc33SAndreas Gruenbacher int err; 774b411b363SPhilipp Reisner 7759f5bdc33SAndreas Gruenbacher err = drbd_recv_short(sock, tconn->data.rbuf, header_size, 0); 7769f5bdc33SAndreas Gruenbacher if (err != header_size) { 7779f5bdc33SAndreas Gruenbacher if (err >= 0) 7789f5bdc33SAndreas Gruenbacher err = -EIO; 7799f5bdc33SAndreas Gruenbacher return err; 7809f5bdc33SAndreas Gruenbacher } 7819f5bdc33SAndreas Gruenbacher err = decode_header(tconn, tconn->data.rbuf, &pi); 7829f5bdc33SAndreas Gruenbacher if (err) 7839f5bdc33SAndreas Gruenbacher return err; 7849f5bdc33SAndreas Gruenbacher return pi.cmd; 785b411b363SPhilipp Reisner } 786b411b363SPhilipp Reisner 787b411b363SPhilipp Reisner /** 788b411b363SPhilipp Reisner * drbd_socket_okay() - Free the socket if its connection is not okay 789b411b363SPhilipp Reisner * @sock: pointer to the pointer to the socket. 790b411b363SPhilipp Reisner */ 791dbd9eea0SPhilipp Reisner static int drbd_socket_okay(struct socket **sock) 792b411b363SPhilipp Reisner { 793b411b363SPhilipp Reisner int rr; 794b411b363SPhilipp Reisner char tb[4]; 795b411b363SPhilipp Reisner 796b411b363SPhilipp Reisner if (!*sock) 79781e84650SAndreas Gruenbacher return false; 798b411b363SPhilipp Reisner 799dbd9eea0SPhilipp Reisner rr = drbd_recv_short(*sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); 800b411b363SPhilipp Reisner 801b411b363SPhilipp Reisner if (rr > 0 || rr == -EAGAIN) { 80281e84650SAndreas Gruenbacher return true; 803b411b363SPhilipp Reisner } else { 804b411b363SPhilipp Reisner sock_release(*sock); 805b411b363SPhilipp Reisner *sock = NULL; 80681e84650SAndreas Gruenbacher return false; 807b411b363SPhilipp Reisner } 808b411b363SPhilipp Reisner } 8092325eb66SPhilipp Reisner /* Gets called if a connection is established, or if a new minor gets created 8102325eb66SPhilipp Reisner in a connection */ 811c141ebdaSPhilipp Reisner int drbd_connected(struct drbd_conf *mdev) 812907599e0SPhilipp Reisner { 8130829f5edSAndreas Gruenbacher int err; 814907599e0SPhilipp Reisner 815907599e0SPhilipp Reisner atomic_set(&mdev->packet_seq, 0); 816907599e0SPhilipp Reisner mdev->peer_seq = 0; 817907599e0SPhilipp Reisner 8188410da8fSPhilipp Reisner mdev->state_mutex = mdev->tconn->agreed_pro_version < 100 ? 8198410da8fSPhilipp Reisner &mdev->tconn->cstate_mutex : 8208410da8fSPhilipp Reisner &mdev->own_state_mutex; 8218410da8fSPhilipp Reisner 8220829f5edSAndreas Gruenbacher err = drbd_send_sync_param(mdev); 8230829f5edSAndreas Gruenbacher if (!err) 8240829f5edSAndreas Gruenbacher err = drbd_send_sizes(mdev, 0, 0); 8250829f5edSAndreas Gruenbacher if (!err) 8260829f5edSAndreas Gruenbacher err = drbd_send_uuids(mdev); 8270829f5edSAndreas Gruenbacher if (!err) 8280829f5edSAndreas Gruenbacher err = drbd_send_state(mdev); 829907599e0SPhilipp Reisner clear_bit(USE_DEGR_WFC_T, &mdev->flags); 830907599e0SPhilipp Reisner clear_bit(RESIZE_PENDING, &mdev->flags); 8318b924f1dSPhilipp Reisner mod_timer(&mdev->request_timer, jiffies + HZ); /* just start it here. */ 8320829f5edSAndreas Gruenbacher return err; 833907599e0SPhilipp Reisner } 834907599e0SPhilipp Reisner 835b411b363SPhilipp Reisner /* 836b411b363SPhilipp Reisner * return values: 837b411b363SPhilipp Reisner * 1 yes, we have a valid connection 838b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 839b411b363SPhilipp Reisner * -1 peer talks different language, 840b411b363SPhilipp Reisner * no point in trying again, please go standalone. 841b411b363SPhilipp Reisner * -2 We do not have a network config... 842b411b363SPhilipp Reisner */ 84381fa2e67SPhilipp Reisner static int conn_connect(struct drbd_tconn *tconn) 844b411b363SPhilipp Reisner { 8452bf89621SAndreas Gruenbacher struct socket *sock, *msock; 846c141ebdaSPhilipp Reisner struct drbd_conf *mdev; 84744ed167dSPhilipp Reisner struct net_conf *nc; 848c141ebdaSPhilipp Reisner int vnr, timeout, try, h, ok; 849b411b363SPhilipp Reisner 850bbeb641cSPhilipp Reisner if (conn_request_state(tconn, NS(conn, C_WF_CONNECTION), CS_VERBOSE) < SS_SUCCESS) 851b411b363SPhilipp Reisner return -2; 852b411b363SPhilipp Reisner 853907599e0SPhilipp Reisner clear_bit(DISCARD_CONCURRENT, &tconn->flags); 8540916e0e3SAndreas Gruenbacher 8550916e0e3SAndreas Gruenbacher /* Assume that the peer only understands protocol 80 until we know better. */ 8560916e0e3SAndreas Gruenbacher tconn->agreed_pro_version = 80; 857b411b363SPhilipp Reisner 858b411b363SPhilipp Reisner do { 8592bf89621SAndreas Gruenbacher struct socket *s; 8602bf89621SAndreas Gruenbacher 861b411b363SPhilipp Reisner for (try = 0;;) { 862b411b363SPhilipp Reisner /* 3 tries, this should take less than a second! */ 863907599e0SPhilipp Reisner s = drbd_try_connect(tconn); 864b411b363SPhilipp Reisner if (s || ++try >= 3) 865b411b363SPhilipp Reisner break; 866b411b363SPhilipp Reisner /* give the other side time to call bind() & listen() */ 86720ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ / 10); 868b411b363SPhilipp Reisner } 869b411b363SPhilipp Reisner 870b411b363SPhilipp Reisner if (s) { 8712bf89621SAndreas Gruenbacher if (!tconn->data.socket) { 8722bf89621SAndreas Gruenbacher tconn->data.socket = s; 8739f5bdc33SAndreas Gruenbacher send_first_packet(tconn, &tconn->data, P_INITIAL_DATA); 8742bf89621SAndreas Gruenbacher } else if (!tconn->meta.socket) { 8752bf89621SAndreas Gruenbacher tconn->meta.socket = s; 8769f5bdc33SAndreas Gruenbacher send_first_packet(tconn, &tconn->meta, P_INITIAL_META); 877b411b363SPhilipp Reisner } else { 87881fa2e67SPhilipp Reisner conn_err(tconn, "Logic error in conn_connect()\n"); 879b411b363SPhilipp Reisner goto out_release_sockets; 880b411b363SPhilipp Reisner } 881b411b363SPhilipp Reisner } 882b411b363SPhilipp Reisner 8832bf89621SAndreas Gruenbacher if (tconn->data.socket && tconn->meta.socket) { 884907599e0SPhilipp Reisner schedule_timeout_interruptible(tconn->net_conf->ping_timeo*HZ/10); 8852bf89621SAndreas Gruenbacher ok = drbd_socket_okay(&tconn->data.socket); 8862bf89621SAndreas Gruenbacher ok = drbd_socket_okay(&tconn->meta.socket) && ok; 887b411b363SPhilipp Reisner if (ok) 888b411b363SPhilipp Reisner break; 889b411b363SPhilipp Reisner } 890b411b363SPhilipp Reisner 891b411b363SPhilipp Reisner retry: 892907599e0SPhilipp Reisner s = drbd_wait_for_connect(tconn); 893b411b363SPhilipp Reisner if (s) { 8949f5bdc33SAndreas Gruenbacher try = receive_first_packet(tconn, s); 8952bf89621SAndreas Gruenbacher drbd_socket_okay(&tconn->data.socket); 8962bf89621SAndreas Gruenbacher drbd_socket_okay(&tconn->meta.socket); 897b411b363SPhilipp Reisner switch (try) { 898e5d6f33aSAndreas Gruenbacher case P_INITIAL_DATA: 8992bf89621SAndreas Gruenbacher if (tconn->data.socket) { 900907599e0SPhilipp Reisner conn_warn(tconn, "initial packet S crossed\n"); 9012bf89621SAndreas Gruenbacher sock_release(tconn->data.socket); 902b411b363SPhilipp Reisner } 9032bf89621SAndreas Gruenbacher tconn->data.socket = s; 904b411b363SPhilipp Reisner break; 905e5d6f33aSAndreas Gruenbacher case P_INITIAL_META: 9062bf89621SAndreas Gruenbacher if (tconn->meta.socket) { 907907599e0SPhilipp Reisner conn_warn(tconn, "initial packet M crossed\n"); 9082bf89621SAndreas Gruenbacher sock_release(tconn->meta.socket); 909b411b363SPhilipp Reisner } 9102bf89621SAndreas Gruenbacher tconn->meta.socket = s; 911907599e0SPhilipp Reisner set_bit(DISCARD_CONCURRENT, &tconn->flags); 912b411b363SPhilipp Reisner break; 913b411b363SPhilipp Reisner default: 914907599e0SPhilipp Reisner conn_warn(tconn, "Error receiving initial packet\n"); 915b411b363SPhilipp Reisner sock_release(s); 916b411b363SPhilipp Reisner if (random32() & 1) 917b411b363SPhilipp Reisner goto retry; 918b411b363SPhilipp Reisner } 919b411b363SPhilipp Reisner } 920b411b363SPhilipp Reisner 921bbeb641cSPhilipp Reisner if (tconn->cstate <= C_DISCONNECTING) 922b411b363SPhilipp Reisner goto out_release_sockets; 923b411b363SPhilipp Reisner if (signal_pending(current)) { 924b411b363SPhilipp Reisner flush_signals(current); 925b411b363SPhilipp Reisner smp_rmb(); 926907599e0SPhilipp Reisner if (get_t_state(&tconn->receiver) == EXITING) 927b411b363SPhilipp Reisner goto out_release_sockets; 928b411b363SPhilipp Reisner } 929b411b363SPhilipp Reisner 9302bf89621SAndreas Gruenbacher if (tconn->data.socket && &tconn->meta.socket) { 9312bf89621SAndreas Gruenbacher ok = drbd_socket_okay(&tconn->data.socket); 9322bf89621SAndreas Gruenbacher ok = drbd_socket_okay(&tconn->meta.socket) && ok; 933b411b363SPhilipp Reisner if (ok) 934b411b363SPhilipp Reisner break; 935b411b363SPhilipp Reisner } 936b411b363SPhilipp Reisner } while (1); 937b411b363SPhilipp Reisner 9382bf89621SAndreas Gruenbacher sock = tconn->data.socket; 9392bf89621SAndreas Gruenbacher msock = tconn->meta.socket; 9402bf89621SAndreas Gruenbacher 941b411b363SPhilipp Reisner msock->sk->sk_reuse = 1; /* SO_REUSEADDR */ 942b411b363SPhilipp Reisner sock->sk->sk_reuse = 1; /* SO_REUSEADDR */ 943b411b363SPhilipp Reisner 944b411b363SPhilipp Reisner sock->sk->sk_allocation = GFP_NOIO; 945b411b363SPhilipp Reisner msock->sk->sk_allocation = GFP_NOIO; 946b411b363SPhilipp Reisner 947b411b363SPhilipp Reisner sock->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; 948b411b363SPhilipp Reisner msock->sk->sk_priority = TC_PRIO_INTERACTIVE; 949b411b363SPhilipp Reisner 950b411b363SPhilipp Reisner /* NOT YET ... 951907599e0SPhilipp Reisner * sock->sk->sk_sndtimeo = tconn->net_conf->timeout*HZ/10; 952b411b363SPhilipp Reisner * sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 9536038178eSAndreas Gruenbacher * first set it to the P_CONNECTION_FEATURES timeout, 954b411b363SPhilipp Reisner * which we set to 4x the configured ping_timeout. */ 95544ed167dSPhilipp Reisner rcu_read_lock(); 95644ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 957b411b363SPhilipp Reisner 95844ed167dSPhilipp Reisner sock->sk->sk_sndtimeo = 95944ed167dSPhilipp Reisner sock->sk->sk_rcvtimeo = nc->ping_timeo*4*HZ/10; 96044ed167dSPhilipp Reisner 96144ed167dSPhilipp Reisner msock->sk->sk_rcvtimeo = nc->ping_int*HZ; 96244ed167dSPhilipp Reisner timeout = nc->timeout * HZ / 10; 96344ed167dSPhilipp Reisner rcu_read_unlock(); 96444ed167dSPhilipp Reisner 96544ed167dSPhilipp Reisner msock->sk->sk_sndtimeo = timeout; 966b411b363SPhilipp Reisner 967b411b363SPhilipp Reisner /* we don't want delays. 96825985edcSLucas De Marchi * we use TCP_CORK where appropriate, though */ 969b411b363SPhilipp Reisner drbd_tcp_nodelay(sock); 970b411b363SPhilipp Reisner drbd_tcp_nodelay(msock); 971b411b363SPhilipp Reisner 972907599e0SPhilipp Reisner tconn->last_received = jiffies; 973b411b363SPhilipp Reisner 9746038178eSAndreas Gruenbacher h = drbd_do_features(tconn); 975b411b363SPhilipp Reisner if (h <= 0) 976b411b363SPhilipp Reisner return h; 977b411b363SPhilipp Reisner 978907599e0SPhilipp Reisner if (tconn->cram_hmac_tfm) { 979b411b363SPhilipp Reisner /* drbd_request_state(mdev, NS(conn, WFAuth)); */ 980907599e0SPhilipp Reisner switch (drbd_do_auth(tconn)) { 981b10d96cbSJohannes Thoma case -1: 982907599e0SPhilipp Reisner conn_err(tconn, "Authentication of peer failed\n"); 983b411b363SPhilipp Reisner return -1; 984b10d96cbSJohannes Thoma case 0: 985907599e0SPhilipp Reisner conn_err(tconn, "Authentication of peer failed, trying again.\n"); 986b10d96cbSJohannes Thoma return 0; 987b411b363SPhilipp Reisner } 988b411b363SPhilipp Reisner } 989b411b363SPhilipp Reisner 990bbeb641cSPhilipp Reisner if (conn_request_state(tconn, NS(conn, C_WF_REPORT_PARAMS), CS_VERBOSE) < SS_SUCCESS) 991b411b363SPhilipp Reisner return 0; 992b411b363SPhilipp Reisner 99344ed167dSPhilipp Reisner sock->sk->sk_sndtimeo = timeout; 994b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 995b411b363SPhilipp Reisner 996907599e0SPhilipp Reisner drbd_thread_start(&tconn->asender); 997b411b363SPhilipp Reisner 998387eb308SAndreas Gruenbacher if (drbd_send_protocol(tconn) == -EOPNOTSUPP) 9997e2455c1SPhilipp Reisner return -1; 1000b411b363SPhilipp Reisner 1001c141ebdaSPhilipp Reisner rcu_read_lock(); 1002c141ebdaSPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, vnr) { 1003c141ebdaSPhilipp Reisner kref_get(&mdev->kref); 1004c141ebdaSPhilipp Reisner rcu_read_unlock(); 1005c141ebdaSPhilipp Reisner drbd_connected(mdev); 1006c141ebdaSPhilipp Reisner kref_put(&mdev->kref, &drbd_minor_destroy); 1007c141ebdaSPhilipp Reisner rcu_read_lock(); 1008c141ebdaSPhilipp Reisner } 1009c141ebdaSPhilipp Reisner rcu_read_unlock(); 1010c141ebdaSPhilipp Reisner 1011d3fcb490SPhilipp Reisner return h; 1012b411b363SPhilipp Reisner 1013b411b363SPhilipp Reisner out_release_sockets: 10142bf89621SAndreas Gruenbacher if (tconn->data.socket) { 10152bf89621SAndreas Gruenbacher sock_release(tconn->data.socket); 10162bf89621SAndreas Gruenbacher tconn->data.socket = NULL; 10172bf89621SAndreas Gruenbacher } 10182bf89621SAndreas Gruenbacher if (tconn->meta.socket) { 10192bf89621SAndreas Gruenbacher sock_release(tconn->meta.socket); 10202bf89621SAndreas Gruenbacher tconn->meta.socket = NULL; 10212bf89621SAndreas Gruenbacher } 1022b411b363SPhilipp Reisner return -1; 1023b411b363SPhilipp Reisner } 1024b411b363SPhilipp Reisner 1025e658983aSAndreas Gruenbacher static int decode_header(struct drbd_tconn *tconn, void *header, struct packet_info *pi) 1026b411b363SPhilipp Reisner { 1027e658983aSAndreas Gruenbacher unsigned int header_size = drbd_header_size(tconn); 1028e658983aSAndreas Gruenbacher 10290c8e36d9SAndreas Gruenbacher if (header_size == sizeof(struct p_header100) && 10300c8e36d9SAndreas Gruenbacher *(__be32 *)header == cpu_to_be32(DRBD_MAGIC_100)) { 10310c8e36d9SAndreas Gruenbacher struct p_header100 *h = header; 10320c8e36d9SAndreas Gruenbacher if (h->pad != 0) { 10330c8e36d9SAndreas Gruenbacher conn_err(tconn, "Header padding is not zero\n"); 10340c8e36d9SAndreas Gruenbacher return -EINVAL; 10350c8e36d9SAndreas Gruenbacher } 10360c8e36d9SAndreas Gruenbacher pi->vnr = be16_to_cpu(h->volume); 10370c8e36d9SAndreas Gruenbacher pi->cmd = be16_to_cpu(h->command); 10380c8e36d9SAndreas Gruenbacher pi->size = be32_to_cpu(h->length); 10390c8e36d9SAndreas Gruenbacher } else if (header_size == sizeof(struct p_header95) && 1040e658983aSAndreas Gruenbacher *(__be16 *)header == cpu_to_be16(DRBD_MAGIC_BIG)) { 1041e658983aSAndreas Gruenbacher struct p_header95 *h = header; 1042e658983aSAndreas Gruenbacher pi->cmd = be16_to_cpu(h->command); 1043b55d84baSAndreas Gruenbacher pi->size = be32_to_cpu(h->length); 1044eefc2f7dSPhilipp Reisner pi->vnr = 0; 1045e658983aSAndreas Gruenbacher } else if (header_size == sizeof(struct p_header80) && 1046e658983aSAndreas Gruenbacher *(__be32 *)header == cpu_to_be32(DRBD_MAGIC)) { 1047e658983aSAndreas Gruenbacher struct p_header80 *h = header; 1048e658983aSAndreas Gruenbacher pi->cmd = be16_to_cpu(h->command); 1049e658983aSAndreas Gruenbacher pi->size = be16_to_cpu(h->length); 105077351055SPhilipp Reisner pi->vnr = 0; 105102918be2SPhilipp Reisner } else { 1052e658983aSAndreas Gruenbacher conn_err(tconn, "Wrong magic value 0x%08x in protocol version %d\n", 1053e658983aSAndreas Gruenbacher be32_to_cpu(*(__be32 *)header), 1054e658983aSAndreas Gruenbacher tconn->agreed_pro_version); 10558172f3e9SAndreas Gruenbacher return -EINVAL; 1056b411b363SPhilipp Reisner } 1057e658983aSAndreas Gruenbacher pi->data = header + header_size; 10588172f3e9SAndreas Gruenbacher return 0; 1059257d0af6SPhilipp Reisner } 1060257d0af6SPhilipp Reisner 10619ba7aa00SPhilipp Reisner static int drbd_recv_header(struct drbd_tconn *tconn, struct packet_info *pi) 1062257d0af6SPhilipp Reisner { 1063e658983aSAndreas Gruenbacher void *buffer = tconn->data.rbuf; 106469bc7bc3SAndreas Gruenbacher int err; 1065257d0af6SPhilipp Reisner 1066e658983aSAndreas Gruenbacher err = drbd_recv_all_warn(tconn, buffer, drbd_header_size(tconn)); 1067a5c31904SAndreas Gruenbacher if (err) 106869bc7bc3SAndreas Gruenbacher return err; 1069257d0af6SPhilipp Reisner 1070e658983aSAndreas Gruenbacher err = decode_header(tconn, buffer, pi); 10719ba7aa00SPhilipp Reisner tconn->last_received = jiffies; 1072b411b363SPhilipp Reisner 107369bc7bc3SAndreas Gruenbacher return err; 1074b411b363SPhilipp Reisner } 1075b411b363SPhilipp Reisner 10762451fc3bSPhilipp Reisner static void drbd_flush(struct drbd_conf *mdev) 1077b411b363SPhilipp Reisner { 1078b411b363SPhilipp Reisner int rv; 1079b411b363SPhilipp Reisner 1080b411b363SPhilipp Reisner if (mdev->write_ordering >= WO_bdev_flush && get_ldev(mdev)) { 1081fbd9b09aSDmitry Monakhov rv = blkdev_issue_flush(mdev->ldev->backing_bdev, GFP_KERNEL, 1082dd3932edSChristoph Hellwig NULL); 1083b411b363SPhilipp Reisner if (rv) { 1084a67b813cSPhilipp Reisner dev_info(DEV, "local disk flush failed with status %d\n", rv); 1085b411b363SPhilipp Reisner /* would rather check on EOPNOTSUPP, but that is not reliable. 1086b411b363SPhilipp Reisner * don't try again for ANY return value != 0 1087b411b363SPhilipp Reisner * if (rv == -EOPNOTSUPP) */ 1088b411b363SPhilipp Reisner drbd_bump_write_ordering(mdev, WO_drain_io); 1089b411b363SPhilipp Reisner } 1090b411b363SPhilipp Reisner put_ldev(mdev); 1091b411b363SPhilipp Reisner } 1092b411b363SPhilipp Reisner } 1093b411b363SPhilipp Reisner 1094b411b363SPhilipp Reisner /** 1095b411b363SPhilipp Reisner * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. 1096b411b363SPhilipp Reisner * @mdev: DRBD device. 1097b411b363SPhilipp Reisner * @epoch: Epoch object. 1098b411b363SPhilipp Reisner * @ev: Epoch event. 1099b411b363SPhilipp Reisner */ 1100b411b363SPhilipp Reisner static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev, 1101b411b363SPhilipp Reisner struct drbd_epoch *epoch, 1102b411b363SPhilipp Reisner enum epoch_event ev) 1103b411b363SPhilipp Reisner { 11042451fc3bSPhilipp Reisner int epoch_size; 1105b411b363SPhilipp Reisner struct drbd_epoch *next_epoch; 1106b411b363SPhilipp Reisner enum finish_epoch rv = FE_STILL_LIVE; 1107b411b363SPhilipp Reisner 1108b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1109b411b363SPhilipp Reisner do { 1110b411b363SPhilipp Reisner next_epoch = NULL; 1111b411b363SPhilipp Reisner 1112b411b363SPhilipp Reisner epoch_size = atomic_read(&epoch->epoch_size); 1113b411b363SPhilipp Reisner 1114b411b363SPhilipp Reisner switch (ev & ~EV_CLEANUP) { 1115b411b363SPhilipp Reisner case EV_PUT: 1116b411b363SPhilipp Reisner atomic_dec(&epoch->active); 1117b411b363SPhilipp Reisner break; 1118b411b363SPhilipp Reisner case EV_GOT_BARRIER_NR: 1119b411b363SPhilipp Reisner set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); 1120b411b363SPhilipp Reisner break; 1121b411b363SPhilipp Reisner case EV_BECAME_LAST: 1122b411b363SPhilipp Reisner /* nothing to do*/ 1123b411b363SPhilipp Reisner break; 1124b411b363SPhilipp Reisner } 1125b411b363SPhilipp Reisner 1126b411b363SPhilipp Reisner if (epoch_size != 0 && 1127b411b363SPhilipp Reisner atomic_read(&epoch->active) == 0 && 11282451fc3bSPhilipp Reisner test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) { 1129b411b363SPhilipp Reisner if (!(ev & EV_CLEANUP)) { 1130b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1131b411b363SPhilipp Reisner drbd_send_b_ack(mdev, epoch->barrier_nr, epoch_size); 1132b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1133b411b363SPhilipp Reisner } 1134b411b363SPhilipp Reisner dec_unacked(mdev); 1135b411b363SPhilipp Reisner 1136b411b363SPhilipp Reisner if (mdev->current_epoch != epoch) { 1137b411b363SPhilipp Reisner next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); 1138b411b363SPhilipp Reisner list_del(&epoch->list); 1139b411b363SPhilipp Reisner ev = EV_BECAME_LAST | (ev & EV_CLEANUP); 1140b411b363SPhilipp Reisner mdev->epochs--; 1141b411b363SPhilipp Reisner kfree(epoch); 1142b411b363SPhilipp Reisner 1143b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1144b411b363SPhilipp Reisner rv = FE_DESTROYED; 1145b411b363SPhilipp Reisner } else { 1146b411b363SPhilipp Reisner epoch->flags = 0; 1147b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1148698f9315SUwe Kleine-König /* atomic_set(&epoch->active, 0); is already zero */ 1149b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1150b411b363SPhilipp Reisner rv = FE_RECYCLED; 11512451fc3bSPhilipp Reisner wake_up(&mdev->ee_wait); 1152b411b363SPhilipp Reisner } 1153b411b363SPhilipp Reisner } 1154b411b363SPhilipp Reisner 1155b411b363SPhilipp Reisner if (!next_epoch) 1156b411b363SPhilipp Reisner break; 1157b411b363SPhilipp Reisner 1158b411b363SPhilipp Reisner epoch = next_epoch; 1159b411b363SPhilipp Reisner } while (1); 1160b411b363SPhilipp Reisner 1161b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1162b411b363SPhilipp Reisner 1163b411b363SPhilipp Reisner return rv; 1164b411b363SPhilipp Reisner } 1165b411b363SPhilipp Reisner 1166b411b363SPhilipp Reisner /** 1167b411b363SPhilipp Reisner * drbd_bump_write_ordering() - Fall back to an other write ordering method 1168b411b363SPhilipp Reisner * @mdev: DRBD device. 1169b411b363SPhilipp Reisner * @wo: Write ordering method to try. 1170b411b363SPhilipp Reisner */ 1171b411b363SPhilipp Reisner void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo) __must_hold(local) 1172b411b363SPhilipp Reisner { 1173daeda1ccSPhilipp Reisner struct disk_conf *dc; 1174b411b363SPhilipp Reisner enum write_ordering_e pwo; 1175b411b363SPhilipp Reisner static char *write_ordering_str[] = { 1176b411b363SPhilipp Reisner [WO_none] = "none", 1177b411b363SPhilipp Reisner [WO_drain_io] = "drain", 1178b411b363SPhilipp Reisner [WO_bdev_flush] = "flush", 1179b411b363SPhilipp Reisner }; 1180b411b363SPhilipp Reisner 1181b411b363SPhilipp Reisner pwo = mdev->write_ordering; 1182b411b363SPhilipp Reisner wo = min(pwo, wo); 1183daeda1ccSPhilipp Reisner rcu_read_lock(); 1184daeda1ccSPhilipp Reisner dc = rcu_dereference(mdev->ldev->disk_conf); 1185daeda1ccSPhilipp Reisner 118666b2f6b9SAndreas Gruenbacher if (wo == WO_bdev_flush && !dc->disk_flushes) 1187b411b363SPhilipp Reisner wo = WO_drain_io; 1188d0c980e2SAndreas Gruenbacher if (wo == WO_drain_io && !dc->disk_drain) 1189b411b363SPhilipp Reisner wo = WO_none; 1190daeda1ccSPhilipp Reisner rcu_read_unlock(); 1191b411b363SPhilipp Reisner mdev->write_ordering = wo; 11922451fc3bSPhilipp Reisner if (pwo != mdev->write_ordering || wo == WO_bdev_flush) 1193b411b363SPhilipp Reisner dev_info(DEV, "Method to ensure write ordering: %s\n", write_ordering_str[mdev->write_ordering]); 1194b411b363SPhilipp Reisner } 1195b411b363SPhilipp Reisner 1196b411b363SPhilipp Reisner /** 1197fbe29decSAndreas Gruenbacher * drbd_submit_peer_request() 119845bb912bSLars Ellenberg * @mdev: DRBD device. 1199db830c46SAndreas Gruenbacher * @peer_req: peer request 120045bb912bSLars Ellenberg * @rw: flag field, see bio->bi_rw 120110f6d992SLars Ellenberg * 120210f6d992SLars Ellenberg * May spread the pages to multiple bios, 120310f6d992SLars Ellenberg * depending on bio_add_page restrictions. 120410f6d992SLars Ellenberg * 120510f6d992SLars Ellenberg * Returns 0 if all bios have been submitted, 120610f6d992SLars Ellenberg * -ENOMEM if we could not allocate enough bios, 120710f6d992SLars Ellenberg * -ENOSPC (any better suggestion?) if we have not been able to bio_add_page a 120810f6d992SLars Ellenberg * single page to an empty bio (which should never happen and likely indicates 120910f6d992SLars Ellenberg * that the lower level IO stack is in some way broken). This has been observed 121010f6d992SLars Ellenberg * on certain Xen deployments. 121145bb912bSLars Ellenberg */ 121245bb912bSLars Ellenberg /* TODO allocate from our own bio_set. */ 1213fbe29decSAndreas Gruenbacher int drbd_submit_peer_request(struct drbd_conf *mdev, 1214fbe29decSAndreas Gruenbacher struct drbd_peer_request *peer_req, 121545bb912bSLars Ellenberg const unsigned rw, const int fault_type) 121645bb912bSLars Ellenberg { 121745bb912bSLars Ellenberg struct bio *bios = NULL; 121845bb912bSLars Ellenberg struct bio *bio; 1219db830c46SAndreas Gruenbacher struct page *page = peer_req->pages; 1220db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 1221db830c46SAndreas Gruenbacher unsigned ds = peer_req->i.size; 122245bb912bSLars Ellenberg unsigned n_bios = 0; 122345bb912bSLars Ellenberg unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT; 122410f6d992SLars Ellenberg int err = -ENOMEM; 122545bb912bSLars Ellenberg 122645bb912bSLars Ellenberg /* In most cases, we will only need one bio. But in case the lower 122745bb912bSLars Ellenberg * level restrictions happen to be different at this offset on this 122845bb912bSLars Ellenberg * side than those of the sending peer, we may need to submit the 1229da4a75d2SLars Ellenberg * request in more than one bio. 1230da4a75d2SLars Ellenberg * 1231da4a75d2SLars Ellenberg * Plain bio_alloc is good enough here, this is no DRBD internally 1232da4a75d2SLars Ellenberg * generated bio, but a bio allocated on behalf of the peer. 1233da4a75d2SLars Ellenberg */ 123445bb912bSLars Ellenberg next_bio: 123545bb912bSLars Ellenberg bio = bio_alloc(GFP_NOIO, nr_pages); 123645bb912bSLars Ellenberg if (!bio) { 123745bb912bSLars Ellenberg dev_err(DEV, "submit_ee: Allocation of a bio failed\n"); 123845bb912bSLars Ellenberg goto fail; 123945bb912bSLars Ellenberg } 1240db830c46SAndreas Gruenbacher /* > peer_req->i.sector, unless this is the first bio */ 124145bb912bSLars Ellenberg bio->bi_sector = sector; 124245bb912bSLars Ellenberg bio->bi_bdev = mdev->ldev->backing_bdev; 124345bb912bSLars Ellenberg bio->bi_rw = rw; 1244db830c46SAndreas Gruenbacher bio->bi_private = peer_req; 1245fcefa62eSAndreas Gruenbacher bio->bi_end_io = drbd_peer_request_endio; 124645bb912bSLars Ellenberg 124745bb912bSLars Ellenberg bio->bi_next = bios; 124845bb912bSLars Ellenberg bios = bio; 124945bb912bSLars Ellenberg ++n_bios; 125045bb912bSLars Ellenberg 125145bb912bSLars Ellenberg page_chain_for_each(page) { 125245bb912bSLars Ellenberg unsigned len = min_t(unsigned, ds, PAGE_SIZE); 125345bb912bSLars Ellenberg if (!bio_add_page(bio, page, len, 0)) { 125410f6d992SLars Ellenberg /* A single page must always be possible! 125510f6d992SLars Ellenberg * But in case it fails anyways, 125610f6d992SLars Ellenberg * we deal with it, and complain (below). */ 125710f6d992SLars Ellenberg if (bio->bi_vcnt == 0) { 125810f6d992SLars Ellenberg dev_err(DEV, 125910f6d992SLars Ellenberg "bio_add_page failed for len=%u, " 126010f6d992SLars Ellenberg "bi_vcnt=0 (bi_sector=%llu)\n", 126110f6d992SLars Ellenberg len, (unsigned long long)bio->bi_sector); 126210f6d992SLars Ellenberg err = -ENOSPC; 126310f6d992SLars Ellenberg goto fail; 126410f6d992SLars Ellenberg } 126545bb912bSLars Ellenberg goto next_bio; 126645bb912bSLars Ellenberg } 126745bb912bSLars Ellenberg ds -= len; 126845bb912bSLars Ellenberg sector += len >> 9; 126945bb912bSLars Ellenberg --nr_pages; 127045bb912bSLars Ellenberg } 127145bb912bSLars Ellenberg D_ASSERT(page == NULL); 127245bb912bSLars Ellenberg D_ASSERT(ds == 0); 127345bb912bSLars Ellenberg 1274db830c46SAndreas Gruenbacher atomic_set(&peer_req->pending_bios, n_bios); 127545bb912bSLars Ellenberg do { 127645bb912bSLars Ellenberg bio = bios; 127745bb912bSLars Ellenberg bios = bios->bi_next; 127845bb912bSLars Ellenberg bio->bi_next = NULL; 127945bb912bSLars Ellenberg 128045bb912bSLars Ellenberg drbd_generic_make_request(mdev, fault_type, bio); 128145bb912bSLars Ellenberg } while (bios); 128245bb912bSLars Ellenberg return 0; 128345bb912bSLars Ellenberg 128445bb912bSLars Ellenberg fail: 128545bb912bSLars Ellenberg while (bios) { 128645bb912bSLars Ellenberg bio = bios; 128745bb912bSLars Ellenberg bios = bios->bi_next; 128845bb912bSLars Ellenberg bio_put(bio); 128945bb912bSLars Ellenberg } 129010f6d992SLars Ellenberg return err; 129145bb912bSLars Ellenberg } 129245bb912bSLars Ellenberg 129353840641SAndreas Gruenbacher static void drbd_remove_epoch_entry_interval(struct drbd_conf *mdev, 1294db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req) 129553840641SAndreas Gruenbacher { 1296db830c46SAndreas Gruenbacher struct drbd_interval *i = &peer_req->i; 129753840641SAndreas Gruenbacher 129853840641SAndreas Gruenbacher drbd_remove_interval(&mdev->write_requests, i); 129953840641SAndreas Gruenbacher drbd_clear_interval(i); 130053840641SAndreas Gruenbacher 13016c852becSAndreas Gruenbacher /* Wake up any processes waiting for this peer request to complete. */ 130253840641SAndreas Gruenbacher if (i->waiting) 130353840641SAndreas Gruenbacher wake_up(&mdev->misc_wait); 130453840641SAndreas Gruenbacher } 130553840641SAndreas Gruenbacher 13064a76b161SAndreas Gruenbacher static int receive_Barrier(struct drbd_tconn *tconn, struct packet_info *pi) 1307b411b363SPhilipp Reisner { 13084a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 13092451fc3bSPhilipp Reisner int rv; 1310e658983aSAndreas Gruenbacher struct p_barrier *p = pi->data; 1311b411b363SPhilipp Reisner struct drbd_epoch *epoch; 1312b411b363SPhilipp Reisner 13134a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 13144a76b161SAndreas Gruenbacher if (!mdev) 13154a76b161SAndreas Gruenbacher return -EIO; 13164a76b161SAndreas Gruenbacher 1317b411b363SPhilipp Reisner inc_unacked(mdev); 1318b411b363SPhilipp Reisner 1319b411b363SPhilipp Reisner mdev->current_epoch->barrier_nr = p->barrier; 1320b411b363SPhilipp Reisner rv = drbd_may_finish_epoch(mdev, mdev->current_epoch, EV_GOT_BARRIER_NR); 1321b411b363SPhilipp Reisner 1322b411b363SPhilipp Reisner /* P_BARRIER_ACK may imply that the corresponding extent is dropped from 1323b411b363SPhilipp Reisner * the activity log, which means it would not be resynced in case the 1324b411b363SPhilipp Reisner * R_PRIMARY crashes now. 1325b411b363SPhilipp Reisner * Therefore we must send the barrier_ack after the barrier request was 1326b411b363SPhilipp Reisner * completed. */ 1327b411b363SPhilipp Reisner switch (mdev->write_ordering) { 1328b411b363SPhilipp Reisner case WO_none: 1329b411b363SPhilipp Reisner if (rv == FE_RECYCLED) 133082bc0194SAndreas Gruenbacher return 0; 1331b411b363SPhilipp Reisner 1332b411b363SPhilipp Reisner /* receiver context, in the writeout path of the other node. 1333b411b363SPhilipp Reisner * avoid potential distributed deadlock */ 1334b411b363SPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 13352451fc3bSPhilipp Reisner if (epoch) 13362451fc3bSPhilipp Reisner break; 13372451fc3bSPhilipp Reisner else 1338b411b363SPhilipp Reisner dev_warn(DEV, "Allocation of an epoch failed, slowing down\n"); 13392451fc3bSPhilipp Reisner /* Fall through */ 13402451fc3bSPhilipp Reisner 13412451fc3bSPhilipp Reisner case WO_bdev_flush: 13422451fc3bSPhilipp Reisner case WO_drain_io: 1343b411b363SPhilipp Reisner drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 13442451fc3bSPhilipp Reisner drbd_flush(mdev); 13452451fc3bSPhilipp Reisner 13462451fc3bSPhilipp Reisner if (atomic_read(&mdev->current_epoch->epoch_size)) { 13472451fc3bSPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 13482451fc3bSPhilipp Reisner if (epoch) 13492451fc3bSPhilipp Reisner break; 1350b411b363SPhilipp Reisner } 1351b411b363SPhilipp Reisner 13522451fc3bSPhilipp Reisner epoch = mdev->current_epoch; 13532451fc3bSPhilipp Reisner wait_event(mdev->ee_wait, atomic_read(&epoch->epoch_size) == 0); 13542451fc3bSPhilipp Reisner 13552451fc3bSPhilipp Reisner D_ASSERT(atomic_read(&epoch->active) == 0); 13562451fc3bSPhilipp Reisner D_ASSERT(epoch->flags == 0); 1357b411b363SPhilipp Reisner 135882bc0194SAndreas Gruenbacher return 0; 13592451fc3bSPhilipp Reisner default: 13602451fc3bSPhilipp Reisner dev_err(DEV, "Strangeness in mdev->write_ordering %d\n", mdev->write_ordering); 136182bc0194SAndreas Gruenbacher return -EIO; 1362b411b363SPhilipp Reisner } 1363b411b363SPhilipp Reisner 1364b411b363SPhilipp Reisner epoch->flags = 0; 1365b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1366b411b363SPhilipp Reisner atomic_set(&epoch->active, 0); 1367b411b363SPhilipp Reisner 1368b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1369b411b363SPhilipp Reisner if (atomic_read(&mdev->current_epoch->epoch_size)) { 1370b411b363SPhilipp Reisner list_add(&epoch->list, &mdev->current_epoch->list); 1371b411b363SPhilipp Reisner mdev->current_epoch = epoch; 1372b411b363SPhilipp Reisner mdev->epochs++; 1373b411b363SPhilipp Reisner } else { 1374b411b363SPhilipp Reisner /* The current_epoch got recycled while we allocated this one... */ 1375b411b363SPhilipp Reisner kfree(epoch); 1376b411b363SPhilipp Reisner } 1377b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1378b411b363SPhilipp Reisner 137982bc0194SAndreas Gruenbacher return 0; 1380b411b363SPhilipp Reisner } 1381b411b363SPhilipp Reisner 1382b411b363SPhilipp Reisner /* used from receive_RSDataReply (recv_resync_read) 1383b411b363SPhilipp Reisner * and from receive_Data */ 1384f6ffca9fSAndreas Gruenbacher static struct drbd_peer_request * 1385f6ffca9fSAndreas Gruenbacher read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, 1386f6ffca9fSAndreas Gruenbacher int data_size) __must_hold(local) 1387b411b363SPhilipp Reisner { 13886666032aSLars Ellenberg const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 1389db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 1390b411b363SPhilipp Reisner struct page *page; 1391a5c31904SAndreas Gruenbacher int dgs, ds, err; 1392a0638456SPhilipp Reisner void *dig_in = mdev->tconn->int_dig_in; 1393a0638456SPhilipp Reisner void *dig_vv = mdev->tconn->int_dig_vv; 13946b4388acSPhilipp Reisner unsigned long *data; 1395b411b363SPhilipp Reisner 139688104ca4SAndreas Gruenbacher dgs = 0; 139788104ca4SAndreas Gruenbacher if (mdev->tconn->peer_integrity_tfm) { 139888104ca4SAndreas Gruenbacher dgs = crypto_hash_digestsize(mdev->tconn->peer_integrity_tfm); 13999f5bdc33SAndreas Gruenbacher /* 14009f5bdc33SAndreas Gruenbacher * FIXME: Receive the incoming digest into the receive buffer 14019f5bdc33SAndreas Gruenbacher * here, together with its struct p_data? 14029f5bdc33SAndreas Gruenbacher */ 1403a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, dig_in, dgs); 1404a5c31904SAndreas Gruenbacher if (err) 1405b411b363SPhilipp Reisner return NULL; 1406b411b363SPhilipp Reisner data_size -= dgs; 140788104ca4SAndreas Gruenbacher } 1408b411b363SPhilipp Reisner 1409841ce241SAndreas Gruenbacher if (!expect(data_size != 0)) 1410841ce241SAndreas Gruenbacher return NULL; 1411841ce241SAndreas Gruenbacher if (!expect(IS_ALIGNED(data_size, 512))) 1412841ce241SAndreas Gruenbacher return NULL; 1413841ce241SAndreas Gruenbacher if (!expect(data_size <= DRBD_MAX_BIO_SIZE)) 1414841ce241SAndreas Gruenbacher return NULL; 1415b411b363SPhilipp Reisner 14166666032aSLars Ellenberg /* even though we trust out peer, 14176666032aSLars Ellenberg * we sometimes have to double check. */ 14186666032aSLars Ellenberg if (sector + (data_size>>9) > capacity) { 1419fdda6544SLars Ellenberg dev_err(DEV, "request from peer beyond end of local disk: " 1420fdda6544SLars Ellenberg "capacity: %llus < sector: %llus + size: %u\n", 14216666032aSLars Ellenberg (unsigned long long)capacity, 14226666032aSLars Ellenberg (unsigned long long)sector, data_size); 14236666032aSLars Ellenberg return NULL; 14246666032aSLars Ellenberg } 14256666032aSLars Ellenberg 1426b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 1427b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 1428b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 14290db55363SAndreas Gruenbacher peer_req = drbd_alloc_peer_req(mdev, id, sector, data_size, GFP_NOIO); 1430db830c46SAndreas Gruenbacher if (!peer_req) 1431b411b363SPhilipp Reisner return NULL; 143245bb912bSLars Ellenberg 1433b411b363SPhilipp Reisner ds = data_size; 1434db830c46SAndreas Gruenbacher page = peer_req->pages; 143545bb912bSLars Ellenberg page_chain_for_each(page) { 143645bb912bSLars Ellenberg unsigned len = min_t(int, ds, PAGE_SIZE); 14376b4388acSPhilipp Reisner data = kmap(page); 1438a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, data, len); 14390cf9d27eSAndreas Gruenbacher if (drbd_insert_fault(mdev, DRBD_FAULT_RECEIVE)) { 14406b4388acSPhilipp Reisner dev_err(DEV, "Fault injection: Corrupting data on receive\n"); 14416b4388acSPhilipp Reisner data[0] = data[0] ^ (unsigned long)-1; 14426b4388acSPhilipp Reisner } 1443b411b363SPhilipp Reisner kunmap(page); 1444a5c31904SAndreas Gruenbacher if (err) { 14453967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 1446b411b363SPhilipp Reisner return NULL; 1447b411b363SPhilipp Reisner } 1448a5c31904SAndreas Gruenbacher ds -= len; 1449b411b363SPhilipp Reisner } 1450b411b363SPhilipp Reisner 1451b411b363SPhilipp Reisner if (dgs) { 14525b614abeSAndreas Gruenbacher drbd_csum_ee(mdev, mdev->tconn->peer_integrity_tfm, peer_req, dig_vv); 1453b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1454470be44aSLars Ellenberg dev_err(DEV, "Digest integrity check FAILED: %llus +%u\n", 1455470be44aSLars Ellenberg (unsigned long long)sector, data_size); 14563967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 1457b411b363SPhilipp Reisner return NULL; 1458b411b363SPhilipp Reisner } 1459b411b363SPhilipp Reisner } 1460b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1461db830c46SAndreas Gruenbacher return peer_req; 1462b411b363SPhilipp Reisner } 1463b411b363SPhilipp Reisner 1464b411b363SPhilipp Reisner /* drbd_drain_block() just takes a data block 1465b411b363SPhilipp Reisner * out of the socket input buffer, and discards it. 1466b411b363SPhilipp Reisner */ 1467b411b363SPhilipp Reisner static int drbd_drain_block(struct drbd_conf *mdev, int data_size) 1468b411b363SPhilipp Reisner { 1469b411b363SPhilipp Reisner struct page *page; 1470a5c31904SAndreas Gruenbacher int err = 0; 1471b411b363SPhilipp Reisner void *data; 1472b411b363SPhilipp Reisner 1473c3470cdeSLars Ellenberg if (!data_size) 1474fc5be839SAndreas Gruenbacher return 0; 1475c3470cdeSLars Ellenberg 1476c37c8ecfSAndreas Gruenbacher page = drbd_alloc_pages(mdev, 1, 1); 1477b411b363SPhilipp Reisner 1478b411b363SPhilipp Reisner data = kmap(page); 1479b411b363SPhilipp Reisner while (data_size) { 1480fc5be839SAndreas Gruenbacher unsigned int len = min_t(int, data_size, PAGE_SIZE); 1481fc5be839SAndreas Gruenbacher 1482a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, data, len); 1483a5c31904SAndreas Gruenbacher if (err) 1484b411b363SPhilipp Reisner break; 1485a5c31904SAndreas Gruenbacher data_size -= len; 1486b411b363SPhilipp Reisner } 1487b411b363SPhilipp Reisner kunmap(page); 14885cc287e0SAndreas Gruenbacher drbd_free_pages(mdev, page, 0); 1489fc5be839SAndreas Gruenbacher return err; 1490b411b363SPhilipp Reisner } 1491b411b363SPhilipp Reisner 1492b411b363SPhilipp Reisner static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req, 1493b411b363SPhilipp Reisner sector_t sector, int data_size) 1494b411b363SPhilipp Reisner { 1495b411b363SPhilipp Reisner struct bio_vec *bvec; 1496b411b363SPhilipp Reisner struct bio *bio; 1497a5c31904SAndreas Gruenbacher int dgs, err, i, expect; 1498a0638456SPhilipp Reisner void *dig_in = mdev->tconn->int_dig_in; 1499a0638456SPhilipp Reisner void *dig_vv = mdev->tconn->int_dig_vv; 1500b411b363SPhilipp Reisner 150188104ca4SAndreas Gruenbacher dgs = 0; 150288104ca4SAndreas Gruenbacher if (mdev->tconn->peer_integrity_tfm) { 150388104ca4SAndreas Gruenbacher dgs = crypto_hash_digestsize(mdev->tconn->peer_integrity_tfm); 1504a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, dig_in, dgs); 1505a5c31904SAndreas Gruenbacher if (err) 1506a5c31904SAndreas Gruenbacher return err; 1507b411b363SPhilipp Reisner data_size -= dgs; 150888104ca4SAndreas Gruenbacher } 1509b411b363SPhilipp Reisner 1510b411b363SPhilipp Reisner /* optimistically update recv_cnt. if receiving fails below, 1511b411b363SPhilipp Reisner * we disconnect anyways, and counters will be reset. */ 1512b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1513b411b363SPhilipp Reisner 1514b411b363SPhilipp Reisner bio = req->master_bio; 1515b411b363SPhilipp Reisner D_ASSERT(sector == bio->bi_sector); 1516b411b363SPhilipp Reisner 1517b411b363SPhilipp Reisner bio_for_each_segment(bvec, bio, i) { 1518a5c31904SAndreas Gruenbacher void *mapped = kmap(bvec->bv_page) + bvec->bv_offset; 1519b411b363SPhilipp Reisner expect = min_t(int, data_size, bvec->bv_len); 1520a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(mdev->tconn, mapped, expect); 1521b411b363SPhilipp Reisner kunmap(bvec->bv_page); 1522a5c31904SAndreas Gruenbacher if (err) 1523a5c31904SAndreas Gruenbacher return err; 1524a5c31904SAndreas Gruenbacher data_size -= expect; 1525b411b363SPhilipp Reisner } 1526b411b363SPhilipp Reisner 1527b411b363SPhilipp Reisner if (dgs) { 15285b614abeSAndreas Gruenbacher drbd_csum_bio(mdev, mdev->tconn->peer_integrity_tfm, bio, dig_vv); 1529b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1530b411b363SPhilipp Reisner dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n"); 153128284cefSAndreas Gruenbacher return -EINVAL; 1532b411b363SPhilipp Reisner } 1533b411b363SPhilipp Reisner } 1534b411b363SPhilipp Reisner 1535b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 153628284cefSAndreas Gruenbacher return 0; 1537b411b363SPhilipp Reisner } 1538b411b363SPhilipp Reisner 1539a990be46SAndreas Gruenbacher /* 1540a990be46SAndreas Gruenbacher * e_end_resync_block() is called in asender context via 1541a990be46SAndreas Gruenbacher * drbd_finish_peer_reqs(). 1542a990be46SAndreas Gruenbacher */ 154399920dc5SAndreas Gruenbacher static int e_end_resync_block(struct drbd_work *w, int unused) 1544b411b363SPhilipp Reisner { 15458050e6d0SAndreas Gruenbacher struct drbd_peer_request *peer_req = 15468050e6d0SAndreas Gruenbacher container_of(w, struct drbd_peer_request, w); 154700d56944SPhilipp Reisner struct drbd_conf *mdev = w->mdev; 1548db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 154999920dc5SAndreas Gruenbacher int err; 1550b411b363SPhilipp Reisner 1551db830c46SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&peer_req->i)); 1552b411b363SPhilipp Reisner 1553db830c46SAndreas Gruenbacher if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { 1554db830c46SAndreas Gruenbacher drbd_set_in_sync(mdev, sector, peer_req->i.size); 155599920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, P_RS_WRITE_ACK, peer_req); 1556b411b363SPhilipp Reisner } else { 1557b411b363SPhilipp Reisner /* Record failure to sync */ 1558db830c46SAndreas Gruenbacher drbd_rs_failed_io(mdev, sector, peer_req->i.size); 1559b411b363SPhilipp Reisner 156099920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, P_NEG_ACK, peer_req); 1561b411b363SPhilipp Reisner } 1562b411b363SPhilipp Reisner dec_unacked(mdev); 1563b411b363SPhilipp Reisner 156499920dc5SAndreas Gruenbacher return err; 1565b411b363SPhilipp Reisner } 1566b411b363SPhilipp Reisner 1567b411b363SPhilipp Reisner static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local) 1568b411b363SPhilipp Reisner { 1569db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 1570b411b363SPhilipp Reisner 1571db830c46SAndreas Gruenbacher peer_req = read_in_block(mdev, ID_SYNCER, sector, data_size); 1572db830c46SAndreas Gruenbacher if (!peer_req) 157345bb912bSLars Ellenberg goto fail; 1574b411b363SPhilipp Reisner 1575b411b363SPhilipp Reisner dec_rs_pending(mdev); 1576b411b363SPhilipp Reisner 1577b411b363SPhilipp Reisner inc_unacked(mdev); 1578b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_resync_block() 1579b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 1580b411b363SPhilipp Reisner 1581db830c46SAndreas Gruenbacher peer_req->w.cb = e_end_resync_block; 158245bb912bSLars Ellenberg 158387eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1584db830c46SAndreas Gruenbacher list_add(&peer_req->w.list, &mdev->sync_ee); 158587eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1586b411b363SPhilipp Reisner 15870f0601f4SLars Ellenberg atomic_add(data_size >> 9, &mdev->rs_sect_ev); 1588fbe29decSAndreas Gruenbacher if (drbd_submit_peer_request(mdev, peer_req, WRITE, DRBD_FAULT_RS_WR) == 0) 1589e1c1b0fcSAndreas Gruenbacher return 0; 159045bb912bSLars Ellenberg 159110f6d992SLars Ellenberg /* don't care for the reason here */ 159210f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 159387eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1594db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 159587eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 159622cc37a9SLars Ellenberg 15973967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 159845bb912bSLars Ellenberg fail: 159945bb912bSLars Ellenberg put_ldev(mdev); 1600e1c1b0fcSAndreas Gruenbacher return -EIO; 1601b411b363SPhilipp Reisner } 1602b411b363SPhilipp Reisner 1603668eebc6SAndreas Gruenbacher static struct drbd_request * 1604bc9c5c41SAndreas Gruenbacher find_request(struct drbd_conf *mdev, struct rb_root *root, u64 id, 1605bc9c5c41SAndreas Gruenbacher sector_t sector, bool missing_ok, const char *func) 1606668eebc6SAndreas Gruenbacher { 1607668eebc6SAndreas Gruenbacher struct drbd_request *req; 1608668eebc6SAndreas Gruenbacher 1609bc9c5c41SAndreas Gruenbacher /* Request object according to our peer */ 1610bc9c5c41SAndreas Gruenbacher req = (struct drbd_request *)(unsigned long)id; 16115e472264SAndreas Gruenbacher if (drbd_contains_interval(root, sector, &req->i) && req->i.local) 1612668eebc6SAndreas Gruenbacher return req; 1613c3afd8f5SAndreas Gruenbacher if (!missing_ok) { 1614c3afd8f5SAndreas Gruenbacher dev_err(DEV, "%s: failed to find request %lu, sector %llus\n", func, 1615c3afd8f5SAndreas Gruenbacher (unsigned long)id, (unsigned long long)sector); 1616c3afd8f5SAndreas Gruenbacher } 1617668eebc6SAndreas Gruenbacher return NULL; 1618668eebc6SAndreas Gruenbacher } 1619668eebc6SAndreas Gruenbacher 16204a76b161SAndreas Gruenbacher static int receive_DataReply(struct drbd_tconn *tconn, struct packet_info *pi) 1621b411b363SPhilipp Reisner { 16224a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 1623b411b363SPhilipp Reisner struct drbd_request *req; 1624b411b363SPhilipp Reisner sector_t sector; 162582bc0194SAndreas Gruenbacher int err; 1626e658983aSAndreas Gruenbacher struct p_data *p = pi->data; 16274a76b161SAndreas Gruenbacher 16284a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 16294a76b161SAndreas Gruenbacher if (!mdev) 16304a76b161SAndreas Gruenbacher return -EIO; 1631b411b363SPhilipp Reisner 1632b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1633b411b363SPhilipp Reisner 163487eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1635bc9c5c41SAndreas Gruenbacher req = find_request(mdev, &mdev->read_requests, p->block_id, sector, false, __func__); 163687eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1637c3afd8f5SAndreas Gruenbacher if (unlikely(!req)) 163882bc0194SAndreas Gruenbacher return -EIO; 1639b411b363SPhilipp Reisner 164024c4830cSBart Van Assche /* hlist_del(&req->collision) is done in _req_may_be_done, to avoid 1641b411b363SPhilipp Reisner * special casing it there for the various failure cases. 1642b411b363SPhilipp Reisner * still no race with drbd_fail_pending_reads */ 1643e2857216SAndreas Gruenbacher err = recv_dless_read(mdev, req, sector, pi->size); 164482bc0194SAndreas Gruenbacher if (!err) 16458554df1cSAndreas Gruenbacher req_mod(req, DATA_RECEIVED); 1646b411b363SPhilipp Reisner /* else: nothing. handled from drbd_disconnect... 1647b411b363SPhilipp Reisner * I don't think we may complete this just yet 1648b411b363SPhilipp Reisner * in case we are "on-disconnect: freeze" */ 1649b411b363SPhilipp Reisner 165082bc0194SAndreas Gruenbacher return err; 1651b411b363SPhilipp Reisner } 1652b411b363SPhilipp Reisner 16534a76b161SAndreas Gruenbacher static int receive_RSDataReply(struct drbd_tconn *tconn, struct packet_info *pi) 1654b411b363SPhilipp Reisner { 16554a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 1656b411b363SPhilipp Reisner sector_t sector; 165782bc0194SAndreas Gruenbacher int err; 1658e658983aSAndreas Gruenbacher struct p_data *p = pi->data; 16594a76b161SAndreas Gruenbacher 16604a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 16614a76b161SAndreas Gruenbacher if (!mdev) 16624a76b161SAndreas Gruenbacher return -EIO; 1663b411b363SPhilipp Reisner 1664b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1665b411b363SPhilipp Reisner D_ASSERT(p->block_id == ID_SYNCER); 1666b411b363SPhilipp Reisner 1667b411b363SPhilipp Reisner if (get_ldev(mdev)) { 1668b411b363SPhilipp Reisner /* data is submitted to disk within recv_resync_read. 1669b411b363SPhilipp Reisner * corresponding put_ldev done below on error, 1670fcefa62eSAndreas Gruenbacher * or in drbd_peer_request_endio. */ 1671e2857216SAndreas Gruenbacher err = recv_resync_read(mdev, sector, pi->size); 1672b411b363SPhilipp Reisner } else { 1673b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 1674b411b363SPhilipp Reisner dev_err(DEV, "Can not write resync data to local disk.\n"); 1675b411b363SPhilipp Reisner 1676e2857216SAndreas Gruenbacher err = drbd_drain_block(mdev, pi->size); 1677b411b363SPhilipp Reisner 1678e2857216SAndreas Gruenbacher drbd_send_ack_dp(mdev, P_NEG_ACK, p, pi->size); 1679b411b363SPhilipp Reisner } 1680b411b363SPhilipp Reisner 1681e2857216SAndreas Gruenbacher atomic_add(pi->size >> 9, &mdev->rs_sect_in); 1682778f271dSPhilipp Reisner 168382bc0194SAndreas Gruenbacher return err; 1684b411b363SPhilipp Reisner } 1685b411b363SPhilipp Reisner 168699920dc5SAndreas Gruenbacher static int w_restart_write(struct drbd_work *w, int cancel) 16877be8da07SAndreas Gruenbacher { 16887be8da07SAndreas Gruenbacher struct drbd_request *req = container_of(w, struct drbd_request, w); 16897be8da07SAndreas Gruenbacher struct drbd_conf *mdev = w->mdev; 16907be8da07SAndreas Gruenbacher struct bio *bio; 16917be8da07SAndreas Gruenbacher unsigned long start_time; 16927be8da07SAndreas Gruenbacher unsigned long flags; 16937be8da07SAndreas Gruenbacher 16947be8da07SAndreas Gruenbacher spin_lock_irqsave(&mdev->tconn->req_lock, flags); 16957be8da07SAndreas Gruenbacher if (!expect(req->rq_state & RQ_POSTPONED)) { 16967be8da07SAndreas Gruenbacher spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); 169799920dc5SAndreas Gruenbacher return -EIO; 16987be8da07SAndreas Gruenbacher } 16997be8da07SAndreas Gruenbacher bio = req->master_bio; 17007be8da07SAndreas Gruenbacher start_time = req->start_time; 17017be8da07SAndreas Gruenbacher /* Postponed requests will not have their master_bio completed! */ 17027be8da07SAndreas Gruenbacher __req_mod(req, DISCARD_WRITE, NULL); 17037be8da07SAndreas Gruenbacher spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); 17047be8da07SAndreas Gruenbacher 17057be8da07SAndreas Gruenbacher while (__drbd_make_request(mdev, bio, start_time)) 17067be8da07SAndreas Gruenbacher /* retry */ ; 170799920dc5SAndreas Gruenbacher return 0; 17087be8da07SAndreas Gruenbacher } 17097be8da07SAndreas Gruenbacher 17107be8da07SAndreas Gruenbacher static void restart_conflicting_writes(struct drbd_conf *mdev, 17117be8da07SAndreas Gruenbacher sector_t sector, int size) 17127be8da07SAndreas Gruenbacher { 17137be8da07SAndreas Gruenbacher struct drbd_interval *i; 17147be8da07SAndreas Gruenbacher struct drbd_request *req; 17157be8da07SAndreas Gruenbacher 17167be8da07SAndreas Gruenbacher drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { 17177be8da07SAndreas Gruenbacher if (!i->local) 17187be8da07SAndreas Gruenbacher continue; 17197be8da07SAndreas Gruenbacher req = container_of(i, struct drbd_request, i); 17207be8da07SAndreas Gruenbacher if (req->rq_state & RQ_LOCAL_PENDING || 17217be8da07SAndreas Gruenbacher !(req->rq_state & RQ_POSTPONED)) 17227be8da07SAndreas Gruenbacher continue; 17237be8da07SAndreas Gruenbacher if (expect(list_empty(&req->w.list))) { 17247be8da07SAndreas Gruenbacher req->w.mdev = mdev; 17257be8da07SAndreas Gruenbacher req->w.cb = w_restart_write; 17267be8da07SAndreas Gruenbacher drbd_queue_work(&mdev->tconn->data.work, &req->w); 17277be8da07SAndreas Gruenbacher } 17287be8da07SAndreas Gruenbacher } 17297be8da07SAndreas Gruenbacher } 17307be8da07SAndreas Gruenbacher 1731a990be46SAndreas Gruenbacher /* 1732a990be46SAndreas Gruenbacher * e_end_block() is called in asender context via drbd_finish_peer_reqs(). 1733b411b363SPhilipp Reisner */ 173499920dc5SAndreas Gruenbacher static int e_end_block(struct drbd_work *w, int cancel) 1735b411b363SPhilipp Reisner { 17368050e6d0SAndreas Gruenbacher struct drbd_peer_request *peer_req = 17378050e6d0SAndreas Gruenbacher container_of(w, struct drbd_peer_request, w); 173800d56944SPhilipp Reisner struct drbd_conf *mdev = w->mdev; 1739db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 174099920dc5SAndreas Gruenbacher int err = 0, pcmd; 1741b411b363SPhilipp Reisner 1742303d1448SPhilipp Reisner if (peer_req->flags & EE_SEND_WRITE_ACK) { 1743db830c46SAndreas Gruenbacher if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { 1744b411b363SPhilipp Reisner pcmd = (mdev->state.conn >= C_SYNC_SOURCE && 1745b411b363SPhilipp Reisner mdev->state.conn <= C_PAUSED_SYNC_T && 1746db830c46SAndreas Gruenbacher peer_req->flags & EE_MAY_SET_IN_SYNC) ? 1747b411b363SPhilipp Reisner P_RS_WRITE_ACK : P_WRITE_ACK; 174899920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, pcmd, peer_req); 1749b411b363SPhilipp Reisner if (pcmd == P_RS_WRITE_ACK) 1750db830c46SAndreas Gruenbacher drbd_set_in_sync(mdev, sector, peer_req->i.size); 1751b411b363SPhilipp Reisner } else { 175299920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, P_NEG_ACK, peer_req); 1753b411b363SPhilipp Reisner /* we expect it to be marked out of sync anyways... 1754b411b363SPhilipp Reisner * maybe assert this? */ 1755b411b363SPhilipp Reisner } 1756b411b363SPhilipp Reisner dec_unacked(mdev); 1757b411b363SPhilipp Reisner } 1758b411b363SPhilipp Reisner /* we delete from the conflict detection hash _after_ we sent out the 1759b411b363SPhilipp Reisner * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ 1760302bdeaeSPhilipp Reisner if (peer_req->flags & EE_IN_INTERVAL_TREE) { 176187eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1762db830c46SAndreas Gruenbacher D_ASSERT(!drbd_interval_empty(&peer_req->i)); 1763db830c46SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 17647be8da07SAndreas Gruenbacher if (peer_req->flags & EE_RESTART_REQUESTS) 17657be8da07SAndreas Gruenbacher restart_conflicting_writes(mdev, sector, peer_req->i.size); 176687eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1767bb3bfe96SAndreas Gruenbacher } else 1768db830c46SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&peer_req->i)); 1769b411b363SPhilipp Reisner 1770db830c46SAndreas Gruenbacher drbd_may_finish_epoch(mdev, peer_req->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); 1771b411b363SPhilipp Reisner 177299920dc5SAndreas Gruenbacher return err; 1773b411b363SPhilipp Reisner } 1774b411b363SPhilipp Reisner 17757be8da07SAndreas Gruenbacher static int e_send_ack(struct drbd_work *w, enum drbd_packet ack) 1776b411b363SPhilipp Reisner { 17777be8da07SAndreas Gruenbacher struct drbd_conf *mdev = w->mdev; 17788050e6d0SAndreas Gruenbacher struct drbd_peer_request *peer_req = 17798050e6d0SAndreas Gruenbacher container_of(w, struct drbd_peer_request, w); 178099920dc5SAndreas Gruenbacher int err; 1781b411b363SPhilipp Reisner 178299920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, ack, peer_req); 1783b411b363SPhilipp Reisner dec_unacked(mdev); 1784b411b363SPhilipp Reisner 178599920dc5SAndreas Gruenbacher return err; 1786b411b363SPhilipp Reisner } 1787b411b363SPhilipp Reisner 178899920dc5SAndreas Gruenbacher static int e_send_discard_write(struct drbd_work *w, int unused) 17897be8da07SAndreas Gruenbacher { 17907be8da07SAndreas Gruenbacher return e_send_ack(w, P_DISCARD_WRITE); 17917be8da07SAndreas Gruenbacher } 17927be8da07SAndreas Gruenbacher 179399920dc5SAndreas Gruenbacher static int e_send_retry_write(struct drbd_work *w, int unused) 17947be8da07SAndreas Gruenbacher { 17957be8da07SAndreas Gruenbacher struct drbd_tconn *tconn = w->mdev->tconn; 17967be8da07SAndreas Gruenbacher 17977be8da07SAndreas Gruenbacher return e_send_ack(w, tconn->agreed_pro_version >= 100 ? 17987be8da07SAndreas Gruenbacher P_RETRY_WRITE : P_DISCARD_WRITE); 17997be8da07SAndreas Gruenbacher } 18007be8da07SAndreas Gruenbacher 18013e394da1SAndreas Gruenbacher static bool seq_greater(u32 a, u32 b) 18023e394da1SAndreas Gruenbacher { 18033e394da1SAndreas Gruenbacher /* 18043e394da1SAndreas Gruenbacher * We assume 32-bit wrap-around here. 18053e394da1SAndreas Gruenbacher * For 24-bit wrap-around, we would have to shift: 18063e394da1SAndreas Gruenbacher * a <<= 8; b <<= 8; 18073e394da1SAndreas Gruenbacher */ 18083e394da1SAndreas Gruenbacher return (s32)a - (s32)b > 0; 18093e394da1SAndreas Gruenbacher } 18103e394da1SAndreas Gruenbacher 18113e394da1SAndreas Gruenbacher static u32 seq_max(u32 a, u32 b) 18123e394da1SAndreas Gruenbacher { 18133e394da1SAndreas Gruenbacher return seq_greater(a, b) ? a : b; 18143e394da1SAndreas Gruenbacher } 18153e394da1SAndreas Gruenbacher 18167be8da07SAndreas Gruenbacher static bool need_peer_seq(struct drbd_conf *mdev) 18177be8da07SAndreas Gruenbacher { 18187be8da07SAndreas Gruenbacher struct drbd_tconn *tconn = mdev->tconn; 1819302bdeaeSPhilipp Reisner int tp; 18207be8da07SAndreas Gruenbacher 18217be8da07SAndreas Gruenbacher /* 18227be8da07SAndreas Gruenbacher * We only need to keep track of the last packet_seq number of our peer 18237be8da07SAndreas Gruenbacher * if we are in dual-primary mode and we have the discard flag set; see 18247be8da07SAndreas Gruenbacher * handle_write_conflicts(). 18257be8da07SAndreas Gruenbacher */ 1826302bdeaeSPhilipp Reisner 1827302bdeaeSPhilipp Reisner rcu_read_lock(); 1828302bdeaeSPhilipp Reisner tp = rcu_dereference(mdev->tconn->net_conf)->two_primaries; 1829302bdeaeSPhilipp Reisner rcu_read_unlock(); 1830302bdeaeSPhilipp Reisner 1831302bdeaeSPhilipp Reisner return tp && test_bit(DISCARD_CONCURRENT, &tconn->flags); 18327be8da07SAndreas Gruenbacher } 18337be8da07SAndreas Gruenbacher 183443ae077dSAndreas Gruenbacher static void update_peer_seq(struct drbd_conf *mdev, unsigned int peer_seq) 18353e394da1SAndreas Gruenbacher { 18363c13b680SLars Ellenberg unsigned int newest_peer_seq; 18373e394da1SAndreas Gruenbacher 18387be8da07SAndreas Gruenbacher if (need_peer_seq(mdev)) { 18393e394da1SAndreas Gruenbacher spin_lock(&mdev->peer_seq_lock); 18403c13b680SLars Ellenberg newest_peer_seq = seq_max(mdev->peer_seq, peer_seq); 18413c13b680SLars Ellenberg mdev->peer_seq = newest_peer_seq; 18423e394da1SAndreas Gruenbacher spin_unlock(&mdev->peer_seq_lock); 18433c13b680SLars Ellenberg /* wake up only if we actually changed mdev->peer_seq */ 18443c13b680SLars Ellenberg if (peer_seq == newest_peer_seq) 18453e394da1SAndreas Gruenbacher wake_up(&mdev->seq_wait); 18463e394da1SAndreas Gruenbacher } 18477be8da07SAndreas Gruenbacher } 18483e394da1SAndreas Gruenbacher 1849b411b363SPhilipp Reisner /* Called from receive_Data. 1850b411b363SPhilipp Reisner * Synchronize packets on sock with packets on msock. 1851b411b363SPhilipp Reisner * 1852b411b363SPhilipp Reisner * This is here so even when a P_DATA packet traveling via sock overtook an Ack 1853b411b363SPhilipp Reisner * packet traveling on msock, they are still processed in the order they have 1854b411b363SPhilipp Reisner * been sent. 1855b411b363SPhilipp Reisner * 1856b411b363SPhilipp Reisner * Note: we don't care for Ack packets overtaking P_DATA packets. 1857b411b363SPhilipp Reisner * 1858b411b363SPhilipp Reisner * In case packet_seq is larger than mdev->peer_seq number, there are 1859b411b363SPhilipp Reisner * outstanding packets on the msock. We wait for them to arrive. 1860b411b363SPhilipp Reisner * In case we are the logically next packet, we update mdev->peer_seq 1861b411b363SPhilipp Reisner * ourselves. Correctly handles 32bit wrap around. 1862b411b363SPhilipp Reisner * 1863b411b363SPhilipp Reisner * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, 1864b411b363SPhilipp Reisner * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds 1865b411b363SPhilipp Reisner * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have 1866b411b363SPhilipp Reisner * 1<<9 == 512 seconds aka ages for the 32bit wrap around... 1867b411b363SPhilipp Reisner * 1868b411b363SPhilipp Reisner * returns 0 if we may process the packet, 1869b411b363SPhilipp Reisner * -ERESTARTSYS if we were interrupted (by disconnect signal). */ 18707be8da07SAndreas Gruenbacher static int wait_for_and_update_peer_seq(struct drbd_conf *mdev, const u32 peer_seq) 1871b411b363SPhilipp Reisner { 1872b411b363SPhilipp Reisner DEFINE_WAIT(wait); 1873b411b363SPhilipp Reisner long timeout; 18747be8da07SAndreas Gruenbacher int ret; 18757be8da07SAndreas Gruenbacher 18767be8da07SAndreas Gruenbacher if (!need_peer_seq(mdev)) 18777be8da07SAndreas Gruenbacher return 0; 18787be8da07SAndreas Gruenbacher 1879b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1880b411b363SPhilipp Reisner for (;;) { 18817be8da07SAndreas Gruenbacher if (!seq_greater(peer_seq - 1, mdev->peer_seq)) { 18827be8da07SAndreas Gruenbacher mdev->peer_seq = seq_max(mdev->peer_seq, peer_seq); 18837be8da07SAndreas Gruenbacher ret = 0; 1884b411b363SPhilipp Reisner break; 18857be8da07SAndreas Gruenbacher } 1886b411b363SPhilipp Reisner if (signal_pending(current)) { 1887b411b363SPhilipp Reisner ret = -ERESTARTSYS; 1888b411b363SPhilipp Reisner break; 1889b411b363SPhilipp Reisner } 18907be8da07SAndreas Gruenbacher prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE); 1891b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 189244ed167dSPhilipp Reisner rcu_read_lock(); 189344ed167dSPhilipp Reisner timeout = rcu_dereference(mdev->tconn->net_conf)->ping_timeo*HZ/10; 189444ed167dSPhilipp Reisner rcu_read_unlock(); 189571b1c1ebSAndreas Gruenbacher timeout = schedule_timeout(timeout); 1896b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 18977be8da07SAndreas Gruenbacher if (!timeout) { 1898b411b363SPhilipp Reisner ret = -ETIMEDOUT; 189971b1c1ebSAndreas Gruenbacher dev_err(DEV, "Timed out waiting for missing ack packets; disconnecting\n"); 1900b411b363SPhilipp Reisner break; 1901b411b363SPhilipp Reisner } 1902b411b363SPhilipp Reisner } 1903b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 19047be8da07SAndreas Gruenbacher finish_wait(&mdev->seq_wait, &wait); 1905b411b363SPhilipp Reisner return ret; 1906b411b363SPhilipp Reisner } 1907b411b363SPhilipp Reisner 1908688593c5SLars Ellenberg /* see also bio_flags_to_wire() 1909688593c5SLars Ellenberg * DRBD_REQ_*, because we need to semantically map the flags to data packet 1910688593c5SLars Ellenberg * flags and back. We may replicate to other kernel versions. */ 1911688593c5SLars Ellenberg static unsigned long wire_flags_to_bio(struct drbd_conf *mdev, u32 dpf) 191276d2e7ecSPhilipp Reisner { 191376d2e7ecSPhilipp Reisner return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | 191476d2e7ecSPhilipp Reisner (dpf & DP_FUA ? REQ_FUA : 0) | 1915688593c5SLars Ellenberg (dpf & DP_FLUSH ? REQ_FLUSH : 0) | 191676d2e7ecSPhilipp Reisner (dpf & DP_DISCARD ? REQ_DISCARD : 0); 191776d2e7ecSPhilipp Reisner } 191876d2e7ecSPhilipp Reisner 19197be8da07SAndreas Gruenbacher static void fail_postponed_requests(struct drbd_conf *mdev, sector_t sector, 19207be8da07SAndreas Gruenbacher unsigned int size) 19217be8da07SAndreas Gruenbacher { 19227be8da07SAndreas Gruenbacher struct drbd_interval *i; 19237be8da07SAndreas Gruenbacher 19247be8da07SAndreas Gruenbacher repeat: 19257be8da07SAndreas Gruenbacher drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { 19267be8da07SAndreas Gruenbacher struct drbd_request *req; 19277be8da07SAndreas Gruenbacher struct bio_and_error m; 19287be8da07SAndreas Gruenbacher 19297be8da07SAndreas Gruenbacher if (!i->local) 19307be8da07SAndreas Gruenbacher continue; 19317be8da07SAndreas Gruenbacher req = container_of(i, struct drbd_request, i); 19327be8da07SAndreas Gruenbacher if (!(req->rq_state & RQ_POSTPONED)) 19337be8da07SAndreas Gruenbacher continue; 19347be8da07SAndreas Gruenbacher req->rq_state &= ~RQ_POSTPONED; 19357be8da07SAndreas Gruenbacher __req_mod(req, NEG_ACKED, &m); 19367be8da07SAndreas Gruenbacher spin_unlock_irq(&mdev->tconn->req_lock); 19377be8da07SAndreas Gruenbacher if (m.bio) 19387be8da07SAndreas Gruenbacher complete_master_bio(mdev, &m); 19397be8da07SAndreas Gruenbacher spin_lock_irq(&mdev->tconn->req_lock); 19407be8da07SAndreas Gruenbacher goto repeat; 19417be8da07SAndreas Gruenbacher } 19427be8da07SAndreas Gruenbacher } 19437be8da07SAndreas Gruenbacher 19447be8da07SAndreas Gruenbacher static int handle_write_conflicts(struct drbd_conf *mdev, 19457be8da07SAndreas Gruenbacher struct drbd_peer_request *peer_req) 19467be8da07SAndreas Gruenbacher { 19477be8da07SAndreas Gruenbacher struct drbd_tconn *tconn = mdev->tconn; 19487be8da07SAndreas Gruenbacher bool resolve_conflicts = test_bit(DISCARD_CONCURRENT, &tconn->flags); 19497be8da07SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 19507be8da07SAndreas Gruenbacher const unsigned int size = peer_req->i.size; 19517be8da07SAndreas Gruenbacher struct drbd_interval *i; 19527be8da07SAndreas Gruenbacher bool equal; 19537be8da07SAndreas Gruenbacher int err; 19547be8da07SAndreas Gruenbacher 19557be8da07SAndreas Gruenbacher /* 19567be8da07SAndreas Gruenbacher * Inserting the peer request into the write_requests tree will prevent 19577be8da07SAndreas Gruenbacher * new conflicting local requests from being added. 19587be8da07SAndreas Gruenbacher */ 19597be8da07SAndreas Gruenbacher drbd_insert_interval(&mdev->write_requests, &peer_req->i); 19607be8da07SAndreas Gruenbacher 19617be8da07SAndreas Gruenbacher repeat: 19627be8da07SAndreas Gruenbacher drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { 19637be8da07SAndreas Gruenbacher if (i == &peer_req->i) 19647be8da07SAndreas Gruenbacher continue; 19657be8da07SAndreas Gruenbacher 19667be8da07SAndreas Gruenbacher if (!i->local) { 19677be8da07SAndreas Gruenbacher /* 19687be8da07SAndreas Gruenbacher * Our peer has sent a conflicting remote request; this 19697be8da07SAndreas Gruenbacher * should not happen in a two-node setup. Wait for the 19707be8da07SAndreas Gruenbacher * earlier peer request to complete. 19717be8da07SAndreas Gruenbacher */ 19727be8da07SAndreas Gruenbacher err = drbd_wait_misc(mdev, i); 19737be8da07SAndreas Gruenbacher if (err) 19747be8da07SAndreas Gruenbacher goto out; 19757be8da07SAndreas Gruenbacher goto repeat; 19767be8da07SAndreas Gruenbacher } 19777be8da07SAndreas Gruenbacher 19787be8da07SAndreas Gruenbacher equal = i->sector == sector && i->size == size; 19797be8da07SAndreas Gruenbacher if (resolve_conflicts) { 19807be8da07SAndreas Gruenbacher /* 19817be8da07SAndreas Gruenbacher * If the peer request is fully contained within the 19827be8da07SAndreas Gruenbacher * overlapping request, it can be discarded; otherwise, 19837be8da07SAndreas Gruenbacher * it will be retried once all overlapping requests 19847be8da07SAndreas Gruenbacher * have completed. 19857be8da07SAndreas Gruenbacher */ 19867be8da07SAndreas Gruenbacher bool discard = i->sector <= sector && i->sector + 19877be8da07SAndreas Gruenbacher (i->size >> 9) >= sector + (size >> 9); 19887be8da07SAndreas Gruenbacher 19897be8da07SAndreas Gruenbacher if (!equal) 19907be8da07SAndreas Gruenbacher dev_alert(DEV, "Concurrent writes detected: " 19917be8da07SAndreas Gruenbacher "local=%llus +%u, remote=%llus +%u, " 19927be8da07SAndreas Gruenbacher "assuming %s came first\n", 19937be8da07SAndreas Gruenbacher (unsigned long long)i->sector, i->size, 19947be8da07SAndreas Gruenbacher (unsigned long long)sector, size, 19957be8da07SAndreas Gruenbacher discard ? "local" : "remote"); 19967be8da07SAndreas Gruenbacher 19977be8da07SAndreas Gruenbacher inc_unacked(mdev); 19987be8da07SAndreas Gruenbacher peer_req->w.cb = discard ? e_send_discard_write : 19997be8da07SAndreas Gruenbacher e_send_retry_write; 20007be8da07SAndreas Gruenbacher list_add_tail(&peer_req->w.list, &mdev->done_ee); 20017be8da07SAndreas Gruenbacher wake_asender(mdev->tconn); 20027be8da07SAndreas Gruenbacher 20037be8da07SAndreas Gruenbacher err = -ENOENT; 20047be8da07SAndreas Gruenbacher goto out; 20057be8da07SAndreas Gruenbacher } else { 20067be8da07SAndreas Gruenbacher struct drbd_request *req = 20077be8da07SAndreas Gruenbacher container_of(i, struct drbd_request, i); 20087be8da07SAndreas Gruenbacher 20097be8da07SAndreas Gruenbacher if (!equal) 20107be8da07SAndreas Gruenbacher dev_alert(DEV, "Concurrent writes detected: " 20117be8da07SAndreas Gruenbacher "local=%llus +%u, remote=%llus +%u\n", 20127be8da07SAndreas Gruenbacher (unsigned long long)i->sector, i->size, 20137be8da07SAndreas Gruenbacher (unsigned long long)sector, size); 20147be8da07SAndreas Gruenbacher 20157be8da07SAndreas Gruenbacher if (req->rq_state & RQ_LOCAL_PENDING || 20167be8da07SAndreas Gruenbacher !(req->rq_state & RQ_POSTPONED)) { 20177be8da07SAndreas Gruenbacher /* 20187be8da07SAndreas Gruenbacher * Wait for the node with the discard flag to 20197be8da07SAndreas Gruenbacher * decide if this request will be discarded or 20207be8da07SAndreas Gruenbacher * retried. Requests that are discarded will 20217be8da07SAndreas Gruenbacher * disappear from the write_requests tree. 20227be8da07SAndreas Gruenbacher * 20237be8da07SAndreas Gruenbacher * In addition, wait for the conflicting 20247be8da07SAndreas Gruenbacher * request to finish locally before submitting 20257be8da07SAndreas Gruenbacher * the conflicting peer request. 20267be8da07SAndreas Gruenbacher */ 20277be8da07SAndreas Gruenbacher err = drbd_wait_misc(mdev, &req->i); 20287be8da07SAndreas Gruenbacher if (err) { 20297be8da07SAndreas Gruenbacher _conn_request_state(mdev->tconn, 20307be8da07SAndreas Gruenbacher NS(conn, C_TIMEOUT), 20317be8da07SAndreas Gruenbacher CS_HARD); 20327be8da07SAndreas Gruenbacher fail_postponed_requests(mdev, sector, size); 20337be8da07SAndreas Gruenbacher goto out; 20347be8da07SAndreas Gruenbacher } 20357be8da07SAndreas Gruenbacher goto repeat; 20367be8da07SAndreas Gruenbacher } 20377be8da07SAndreas Gruenbacher /* 20387be8da07SAndreas Gruenbacher * Remember to restart the conflicting requests after 20397be8da07SAndreas Gruenbacher * the new peer request has completed. 20407be8da07SAndreas Gruenbacher */ 20417be8da07SAndreas Gruenbacher peer_req->flags |= EE_RESTART_REQUESTS; 20427be8da07SAndreas Gruenbacher } 20437be8da07SAndreas Gruenbacher } 20447be8da07SAndreas Gruenbacher err = 0; 20457be8da07SAndreas Gruenbacher 20467be8da07SAndreas Gruenbacher out: 20477be8da07SAndreas Gruenbacher if (err) 20487be8da07SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 20497be8da07SAndreas Gruenbacher return err; 20507be8da07SAndreas Gruenbacher } 20517be8da07SAndreas Gruenbacher 2052b411b363SPhilipp Reisner /* mirrored write */ 20534a76b161SAndreas Gruenbacher static int receive_Data(struct drbd_tconn *tconn, struct packet_info *pi) 2054b411b363SPhilipp Reisner { 20554a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 2056b411b363SPhilipp Reisner sector_t sector; 2057db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 2058e658983aSAndreas Gruenbacher struct p_data *p = pi->data; 20597be8da07SAndreas Gruenbacher u32 peer_seq = be32_to_cpu(p->seq_num); 2060b411b363SPhilipp Reisner int rw = WRITE; 2061b411b363SPhilipp Reisner u32 dp_flags; 2062302bdeaeSPhilipp Reisner int err, tp; 20637be8da07SAndreas Gruenbacher 20644a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 20654a76b161SAndreas Gruenbacher if (!mdev) 20664a76b161SAndreas Gruenbacher return -EIO; 20674a76b161SAndreas Gruenbacher 2068b411b363SPhilipp Reisner if (!get_ldev(mdev)) { 206982bc0194SAndreas Gruenbacher int err2; 207082bc0194SAndreas Gruenbacher 20717be8da07SAndreas Gruenbacher err = wait_for_and_update_peer_seq(mdev, peer_seq); 2072e2857216SAndreas Gruenbacher drbd_send_ack_dp(mdev, P_NEG_ACK, p, pi->size); 2073b411b363SPhilipp Reisner atomic_inc(&mdev->current_epoch->epoch_size); 2074e2857216SAndreas Gruenbacher err2 = drbd_drain_block(mdev, pi->size); 207582bc0194SAndreas Gruenbacher if (!err) 207682bc0194SAndreas Gruenbacher err = err2; 207782bc0194SAndreas Gruenbacher return err; 2078b411b363SPhilipp Reisner } 2079b411b363SPhilipp Reisner 2080fcefa62eSAndreas Gruenbacher /* 2081fcefa62eSAndreas Gruenbacher * Corresponding put_ldev done either below (on various errors), or in 2082fcefa62eSAndreas Gruenbacher * drbd_peer_request_endio, if we successfully submit the data at the 2083fcefa62eSAndreas Gruenbacher * end of this function. 2084fcefa62eSAndreas Gruenbacher */ 2085b411b363SPhilipp Reisner 2086b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 2087e2857216SAndreas Gruenbacher peer_req = read_in_block(mdev, p->block_id, sector, pi->size); 2088db830c46SAndreas Gruenbacher if (!peer_req) { 2089b411b363SPhilipp Reisner put_ldev(mdev); 209082bc0194SAndreas Gruenbacher return -EIO; 2091b411b363SPhilipp Reisner } 2092b411b363SPhilipp Reisner 2093db830c46SAndreas Gruenbacher peer_req->w.cb = e_end_block; 2094b411b363SPhilipp Reisner 2095688593c5SLars Ellenberg dp_flags = be32_to_cpu(p->dp_flags); 2096688593c5SLars Ellenberg rw |= wire_flags_to_bio(mdev, dp_flags); 2097688593c5SLars Ellenberg 2098688593c5SLars Ellenberg if (dp_flags & DP_MAY_SET_IN_SYNC) 2099db830c46SAndreas Gruenbacher peer_req->flags |= EE_MAY_SET_IN_SYNC; 2100688593c5SLars Ellenberg 2101b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 2102db830c46SAndreas Gruenbacher peer_req->epoch = mdev->current_epoch; 2103db830c46SAndreas Gruenbacher atomic_inc(&peer_req->epoch->epoch_size); 2104db830c46SAndreas Gruenbacher atomic_inc(&peer_req->epoch->active); 2105b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 2106b411b363SPhilipp Reisner 2107302bdeaeSPhilipp Reisner rcu_read_lock(); 2108302bdeaeSPhilipp Reisner tp = rcu_dereference(mdev->tconn->net_conf)->two_primaries; 2109302bdeaeSPhilipp Reisner rcu_read_unlock(); 2110302bdeaeSPhilipp Reisner if (tp) { 2111302bdeaeSPhilipp Reisner peer_req->flags |= EE_IN_INTERVAL_TREE; 21127be8da07SAndreas Gruenbacher err = wait_for_and_update_peer_seq(mdev, peer_seq); 21137be8da07SAndreas Gruenbacher if (err) 2114b411b363SPhilipp Reisner goto out_interrupted; 211587eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 21167be8da07SAndreas Gruenbacher err = handle_write_conflicts(mdev, peer_req); 21177be8da07SAndreas Gruenbacher if (err) { 211887eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 21197be8da07SAndreas Gruenbacher if (err == -ENOENT) { 2120b411b363SPhilipp Reisner put_ldev(mdev); 212182bc0194SAndreas Gruenbacher return 0; 2122b411b363SPhilipp Reisner } 2123b411b363SPhilipp Reisner goto out_interrupted; 2124b411b363SPhilipp Reisner } 21257be8da07SAndreas Gruenbacher } else 212687eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2127db830c46SAndreas Gruenbacher list_add(&peer_req->w.list, &mdev->active_ee); 212887eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 2129b411b363SPhilipp Reisner 2130303d1448SPhilipp Reisner if (mdev->tconn->agreed_pro_version < 100) { 213144ed167dSPhilipp Reisner rcu_read_lock(); 213244ed167dSPhilipp Reisner switch (rcu_dereference(mdev->tconn->net_conf)->wire_protocol) { 2133b411b363SPhilipp Reisner case DRBD_PROT_C: 2134303d1448SPhilipp Reisner dp_flags |= DP_SEND_WRITE_ACK; 2135303d1448SPhilipp Reisner break; 2136303d1448SPhilipp Reisner case DRBD_PROT_B: 2137303d1448SPhilipp Reisner dp_flags |= DP_SEND_RECEIVE_ACK; 2138303d1448SPhilipp Reisner break; 2139303d1448SPhilipp Reisner } 214044ed167dSPhilipp Reisner rcu_read_unlock(); 2141303d1448SPhilipp Reisner } 2142303d1448SPhilipp Reisner 2143303d1448SPhilipp Reisner if (dp_flags & DP_SEND_WRITE_ACK) { 2144303d1448SPhilipp Reisner peer_req->flags |= EE_SEND_WRITE_ACK; 2145b411b363SPhilipp Reisner inc_unacked(mdev); 2146b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_block() 2147b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 2148303d1448SPhilipp Reisner } 2149303d1448SPhilipp Reisner 2150303d1448SPhilipp Reisner if (dp_flags & DP_SEND_RECEIVE_ACK) { 2151b411b363SPhilipp Reisner /* I really don't like it that the receiver thread 2152b411b363SPhilipp Reisner * sends on the msock, but anyways */ 2153db830c46SAndreas Gruenbacher drbd_send_ack(mdev, P_RECV_ACK, peer_req); 2154b411b363SPhilipp Reisner } 2155b411b363SPhilipp Reisner 21566719fb03SLars Ellenberg if (mdev->state.pdsk < D_INCONSISTENT) { 2157b411b363SPhilipp Reisner /* In case we have the only disk of the cluster, */ 2158db830c46SAndreas Gruenbacher drbd_set_out_of_sync(mdev, peer_req->i.sector, peer_req->i.size); 2159db830c46SAndreas Gruenbacher peer_req->flags |= EE_CALL_AL_COMPLETE_IO; 2160db830c46SAndreas Gruenbacher peer_req->flags &= ~EE_MAY_SET_IN_SYNC; 2161181286adSLars Ellenberg drbd_al_begin_io(mdev, &peer_req->i); 2162b411b363SPhilipp Reisner } 2163b411b363SPhilipp Reisner 216482bc0194SAndreas Gruenbacher err = drbd_submit_peer_request(mdev, peer_req, rw, DRBD_FAULT_DT_WR); 216582bc0194SAndreas Gruenbacher if (!err) 216682bc0194SAndreas Gruenbacher return 0; 2167b411b363SPhilipp Reisner 216810f6d992SLars Ellenberg /* don't care for the reason here */ 216910f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 217087eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2171db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 2172db830c46SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 217387eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 2174db830c46SAndreas Gruenbacher if (peer_req->flags & EE_CALL_AL_COMPLETE_IO) 2175181286adSLars Ellenberg drbd_al_complete_io(mdev, &peer_req->i); 217622cc37a9SLars Ellenberg 2177b411b363SPhilipp Reisner out_interrupted: 2178db830c46SAndreas Gruenbacher drbd_may_finish_epoch(mdev, peer_req->epoch, EV_PUT + EV_CLEANUP); 2179b411b363SPhilipp Reisner put_ldev(mdev); 21803967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 218182bc0194SAndreas Gruenbacher return err; 2182b411b363SPhilipp Reisner } 2183b411b363SPhilipp Reisner 21840f0601f4SLars Ellenberg /* We may throttle resync, if the lower device seems to be busy, 21850f0601f4SLars Ellenberg * and current sync rate is above c_min_rate. 21860f0601f4SLars Ellenberg * 21870f0601f4SLars Ellenberg * To decide whether or not the lower device is busy, we use a scheme similar 21880f0601f4SLars Ellenberg * to MD RAID is_mddev_idle(): if the partition stats reveal "significant" 21890f0601f4SLars Ellenberg * (more than 64 sectors) of activity we cannot account for with our own resync 21900f0601f4SLars Ellenberg * activity, it obviously is "busy". 21910f0601f4SLars Ellenberg * 21920f0601f4SLars Ellenberg * The current sync rate used here uses only the most recent two step marks, 21930f0601f4SLars Ellenberg * to have a short time average so we can react faster. 21940f0601f4SLars Ellenberg */ 2195e3555d85SPhilipp Reisner int drbd_rs_should_slow_down(struct drbd_conf *mdev, sector_t sector) 21960f0601f4SLars Ellenberg { 21970f0601f4SLars Ellenberg struct gendisk *disk = mdev->ldev->backing_bdev->bd_contains->bd_disk; 21980f0601f4SLars Ellenberg unsigned long db, dt, dbdt; 2199e3555d85SPhilipp Reisner struct lc_element *tmp; 22000f0601f4SLars Ellenberg int curr_events; 22010f0601f4SLars Ellenberg int throttle = 0; 2202daeda1ccSPhilipp Reisner unsigned int c_min_rate; 2203daeda1ccSPhilipp Reisner 2204daeda1ccSPhilipp Reisner rcu_read_lock(); 2205daeda1ccSPhilipp Reisner c_min_rate = rcu_dereference(mdev->ldev->disk_conf)->c_min_rate; 2206daeda1ccSPhilipp Reisner rcu_read_unlock(); 22070f0601f4SLars Ellenberg 22080f0601f4SLars Ellenberg /* feature disabled? */ 2209daeda1ccSPhilipp Reisner if (c_min_rate == 0) 22100f0601f4SLars Ellenberg return 0; 22110f0601f4SLars Ellenberg 2212e3555d85SPhilipp Reisner spin_lock_irq(&mdev->al_lock); 2213e3555d85SPhilipp Reisner tmp = lc_find(mdev->resync, BM_SECT_TO_EXT(sector)); 2214e3555d85SPhilipp Reisner if (tmp) { 2215e3555d85SPhilipp Reisner struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); 2216e3555d85SPhilipp Reisner if (test_bit(BME_PRIORITY, &bm_ext->flags)) { 2217e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 2218e3555d85SPhilipp Reisner return 0; 2219e3555d85SPhilipp Reisner } 2220e3555d85SPhilipp Reisner /* Do not slow down if app IO is already waiting for this extent */ 2221e3555d85SPhilipp Reisner } 2222e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 2223e3555d85SPhilipp Reisner 22240f0601f4SLars Ellenberg curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + 22250f0601f4SLars Ellenberg (int)part_stat_read(&disk->part0, sectors[1]) - 22260f0601f4SLars Ellenberg atomic_read(&mdev->rs_sect_ev); 2227e3555d85SPhilipp Reisner 22280f0601f4SLars Ellenberg if (!mdev->rs_last_events || curr_events - mdev->rs_last_events > 64) { 22290f0601f4SLars Ellenberg unsigned long rs_left; 22300f0601f4SLars Ellenberg int i; 22310f0601f4SLars Ellenberg 22320f0601f4SLars Ellenberg mdev->rs_last_events = curr_events; 22330f0601f4SLars Ellenberg 22340f0601f4SLars Ellenberg /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, 22350f0601f4SLars Ellenberg * approx. */ 22362649f080SLars Ellenberg i = (mdev->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; 22372649f080SLars Ellenberg 22382649f080SLars Ellenberg if (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T) 22392649f080SLars Ellenberg rs_left = mdev->ov_left; 22402649f080SLars Ellenberg else 22410f0601f4SLars Ellenberg rs_left = drbd_bm_total_weight(mdev) - mdev->rs_failed; 22420f0601f4SLars Ellenberg 22430f0601f4SLars Ellenberg dt = ((long)jiffies - (long)mdev->rs_mark_time[i]) / HZ; 22440f0601f4SLars Ellenberg if (!dt) 22450f0601f4SLars Ellenberg dt++; 22460f0601f4SLars Ellenberg db = mdev->rs_mark_left[i] - rs_left; 22470f0601f4SLars Ellenberg dbdt = Bit2KB(db/dt); 22480f0601f4SLars Ellenberg 2249daeda1ccSPhilipp Reisner if (dbdt > c_min_rate) 22500f0601f4SLars Ellenberg throttle = 1; 22510f0601f4SLars Ellenberg } 22520f0601f4SLars Ellenberg return throttle; 22530f0601f4SLars Ellenberg } 22540f0601f4SLars Ellenberg 22550f0601f4SLars Ellenberg 22564a76b161SAndreas Gruenbacher static int receive_DataRequest(struct drbd_tconn *tconn, struct packet_info *pi) 2257b411b363SPhilipp Reisner { 22584a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 2259b411b363SPhilipp Reisner sector_t sector; 22604a76b161SAndreas Gruenbacher sector_t capacity; 2261db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 2262b411b363SPhilipp Reisner struct digest_info *di = NULL; 2263b18b37beSPhilipp Reisner int size, verb; 2264b411b363SPhilipp Reisner unsigned int fault_type; 2265e658983aSAndreas Gruenbacher struct p_block_req *p = pi->data; 22664a76b161SAndreas Gruenbacher 22674a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 22684a76b161SAndreas Gruenbacher if (!mdev) 22694a76b161SAndreas Gruenbacher return -EIO; 22704a76b161SAndreas Gruenbacher capacity = drbd_get_capacity(mdev->this_bdev); 2271b411b363SPhilipp Reisner 2272b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 2273b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 2274b411b363SPhilipp Reisner 2275c670a398SAndreas Gruenbacher if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) { 2276b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 2277b411b363SPhilipp Reisner (unsigned long long)sector, size); 227882bc0194SAndreas Gruenbacher return -EINVAL; 2279b411b363SPhilipp Reisner } 2280b411b363SPhilipp Reisner if (sector + (size>>9) > capacity) { 2281b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 2282b411b363SPhilipp Reisner (unsigned long long)sector, size); 228382bc0194SAndreas Gruenbacher return -EINVAL; 2284b411b363SPhilipp Reisner } 2285b411b363SPhilipp Reisner 2286b411b363SPhilipp Reisner if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) { 2287b18b37beSPhilipp Reisner verb = 1; 2288e2857216SAndreas Gruenbacher switch (pi->cmd) { 2289b18b37beSPhilipp Reisner case P_DATA_REQUEST: 2290b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_DREPLY, p); 2291b18b37beSPhilipp Reisner break; 2292b18b37beSPhilipp Reisner case P_RS_DATA_REQUEST: 2293b18b37beSPhilipp Reisner case P_CSUM_RS_REQUEST: 2294b18b37beSPhilipp Reisner case P_OV_REQUEST: 2295b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_RS_DREPLY , p); 2296b18b37beSPhilipp Reisner break; 2297b18b37beSPhilipp Reisner case P_OV_REPLY: 2298b18b37beSPhilipp Reisner verb = 0; 2299b18b37beSPhilipp Reisner dec_rs_pending(mdev); 2300b18b37beSPhilipp Reisner drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, ID_IN_SYNC); 2301b18b37beSPhilipp Reisner break; 2302b18b37beSPhilipp Reisner default: 230349ba9b1bSAndreas Gruenbacher BUG(); 2304b18b37beSPhilipp Reisner } 2305b18b37beSPhilipp Reisner if (verb && __ratelimit(&drbd_ratelimit_state)) 2306b411b363SPhilipp Reisner dev_err(DEV, "Can not satisfy peer's read request, " 2307b411b363SPhilipp Reisner "no local data.\n"); 2308b18b37beSPhilipp Reisner 2309a821cc4aSLars Ellenberg /* drain possibly payload */ 2310e2857216SAndreas Gruenbacher return drbd_drain_block(mdev, pi->size); 2311b411b363SPhilipp Reisner } 2312b411b363SPhilipp Reisner 2313b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 2314b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 2315b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 23160db55363SAndreas Gruenbacher peer_req = drbd_alloc_peer_req(mdev, p->block_id, sector, size, GFP_NOIO); 2317db830c46SAndreas Gruenbacher if (!peer_req) { 2318b411b363SPhilipp Reisner put_ldev(mdev); 231982bc0194SAndreas Gruenbacher return -ENOMEM; 2320b411b363SPhilipp Reisner } 2321b411b363SPhilipp Reisner 2322e2857216SAndreas Gruenbacher switch (pi->cmd) { 2323b411b363SPhilipp Reisner case P_DATA_REQUEST: 2324db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_data_req; 2325b411b363SPhilipp Reisner fault_type = DRBD_FAULT_DT_RD; 232680a40e43SLars Ellenberg /* application IO, don't drbd_rs_begin_io */ 232780a40e43SLars Ellenberg goto submit; 232880a40e43SLars Ellenberg 2329b411b363SPhilipp Reisner case P_RS_DATA_REQUEST: 2330db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_rsdata_req; 2331b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 23325f9915bbSLars Ellenberg /* used in the sector offset progress display */ 23335f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 2334b411b363SPhilipp Reisner break; 2335b411b363SPhilipp Reisner 2336b411b363SPhilipp Reisner case P_OV_REPLY: 2337b411b363SPhilipp Reisner case P_CSUM_RS_REQUEST: 2338b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2339e2857216SAndreas Gruenbacher di = kmalloc(sizeof(*di) + pi->size, GFP_NOIO); 2340b411b363SPhilipp Reisner if (!di) 2341b411b363SPhilipp Reisner goto out_free_e; 2342b411b363SPhilipp Reisner 2343e2857216SAndreas Gruenbacher di->digest_size = pi->size; 2344b411b363SPhilipp Reisner di->digest = (((char *)di)+sizeof(struct digest_info)); 2345b411b363SPhilipp Reisner 2346db830c46SAndreas Gruenbacher peer_req->digest = di; 2347db830c46SAndreas Gruenbacher peer_req->flags |= EE_HAS_DIGEST; 2348c36c3cedSLars Ellenberg 2349e2857216SAndreas Gruenbacher if (drbd_recv_all(mdev->tconn, di->digest, pi->size)) 2350b411b363SPhilipp Reisner goto out_free_e; 2351b411b363SPhilipp Reisner 2352e2857216SAndreas Gruenbacher if (pi->cmd == P_CSUM_RS_REQUEST) { 235331890f4aSPhilipp Reisner D_ASSERT(mdev->tconn->agreed_pro_version >= 89); 2354db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_csum_rs_req; 23555f9915bbSLars Ellenberg /* used in the sector offset progress display */ 23565f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 2357e2857216SAndreas Gruenbacher } else if (pi->cmd == P_OV_REPLY) { 23582649f080SLars Ellenberg /* track progress, we may need to throttle */ 23592649f080SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_in); 2360db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_ov_reply; 2361b411b363SPhilipp Reisner dec_rs_pending(mdev); 23620f0601f4SLars Ellenberg /* drbd_rs_begin_io done when we sent this request, 23630f0601f4SLars Ellenberg * but accounting still needs to be done. */ 23640f0601f4SLars Ellenberg goto submit_for_resync; 2365b411b363SPhilipp Reisner } 2366b411b363SPhilipp Reisner break; 2367b411b363SPhilipp Reisner 2368b411b363SPhilipp Reisner case P_OV_REQUEST: 2369b411b363SPhilipp Reisner if (mdev->ov_start_sector == ~(sector_t)0 && 237031890f4aSPhilipp Reisner mdev->tconn->agreed_pro_version >= 90) { 2371de228bbaSLars Ellenberg unsigned long now = jiffies; 2372de228bbaSLars Ellenberg int i; 2373b411b363SPhilipp Reisner mdev->ov_start_sector = sector; 2374b411b363SPhilipp Reisner mdev->ov_position = sector; 237530b743a2SLars Ellenberg mdev->ov_left = drbd_bm_bits(mdev) - BM_SECT_TO_BIT(sector); 237630b743a2SLars Ellenberg mdev->rs_total = mdev->ov_left; 2377de228bbaSLars Ellenberg for (i = 0; i < DRBD_SYNC_MARKS; i++) { 2378de228bbaSLars Ellenberg mdev->rs_mark_left[i] = mdev->ov_left; 2379de228bbaSLars Ellenberg mdev->rs_mark_time[i] = now; 2380de228bbaSLars Ellenberg } 2381b411b363SPhilipp Reisner dev_info(DEV, "Online Verify start sector: %llu\n", 2382b411b363SPhilipp Reisner (unsigned long long)sector); 2383b411b363SPhilipp Reisner } 2384db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_ov_req; 2385b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2386b411b363SPhilipp Reisner break; 2387b411b363SPhilipp Reisner 2388b411b363SPhilipp Reisner default: 238949ba9b1bSAndreas Gruenbacher BUG(); 2390b411b363SPhilipp Reisner } 2391b411b363SPhilipp Reisner 23920f0601f4SLars Ellenberg /* Throttle, drbd_rs_begin_io and submit should become asynchronous 23930f0601f4SLars Ellenberg * wrt the receiver, but it is not as straightforward as it may seem. 23940f0601f4SLars Ellenberg * Various places in the resync start and stop logic assume resync 23950f0601f4SLars Ellenberg * requests are processed in order, requeuing this on the worker thread 23960f0601f4SLars Ellenberg * introduces a bunch of new code for synchronization between threads. 23970f0601f4SLars Ellenberg * 23980f0601f4SLars Ellenberg * Unlimited throttling before drbd_rs_begin_io may stall the resync 23990f0601f4SLars Ellenberg * "forever", throttling after drbd_rs_begin_io will lock that extent 24000f0601f4SLars Ellenberg * for application writes for the same time. For now, just throttle 24010f0601f4SLars Ellenberg * here, where the rest of the code expects the receiver to sleep for 24020f0601f4SLars Ellenberg * a while, anyways. 24030f0601f4SLars Ellenberg */ 2404b411b363SPhilipp Reisner 24050f0601f4SLars Ellenberg /* Throttle before drbd_rs_begin_io, as that locks out application IO; 24060f0601f4SLars Ellenberg * this defers syncer requests for some time, before letting at least 24070f0601f4SLars Ellenberg * on request through. The resync controller on the receiving side 24080f0601f4SLars Ellenberg * will adapt to the incoming rate accordingly. 24090f0601f4SLars Ellenberg * 24100f0601f4SLars Ellenberg * We cannot throttle here if remote is Primary/SyncTarget: 24110f0601f4SLars Ellenberg * we would also throttle its application reads. 24120f0601f4SLars Ellenberg * In that case, throttling is done on the SyncTarget only. 24130f0601f4SLars Ellenberg */ 2414e3555d85SPhilipp Reisner if (mdev->state.peer != R_PRIMARY && drbd_rs_should_slow_down(mdev, sector)) 2415e3555d85SPhilipp Reisner schedule_timeout_uninterruptible(HZ/10); 2416e3555d85SPhilipp Reisner if (drbd_rs_begin_io(mdev, sector)) 241780a40e43SLars Ellenberg goto out_free_e; 2418b411b363SPhilipp Reisner 24190f0601f4SLars Ellenberg submit_for_resync: 24200f0601f4SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_ev); 24210f0601f4SLars Ellenberg 242280a40e43SLars Ellenberg submit: 2423b411b363SPhilipp Reisner inc_unacked(mdev); 242487eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2425db830c46SAndreas Gruenbacher list_add_tail(&peer_req->w.list, &mdev->read_ee); 242687eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 2427b411b363SPhilipp Reisner 2428fbe29decSAndreas Gruenbacher if (drbd_submit_peer_request(mdev, peer_req, READ, fault_type) == 0) 242982bc0194SAndreas Gruenbacher return 0; 2430b411b363SPhilipp Reisner 243110f6d992SLars Ellenberg /* don't care for the reason here */ 243210f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 243387eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2434db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 243587eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 243622cc37a9SLars Ellenberg /* no drbd_rs_complete_io(), we are dropping the connection anyways */ 243722cc37a9SLars Ellenberg 2438b411b363SPhilipp Reisner out_free_e: 2439b411b363SPhilipp Reisner put_ldev(mdev); 24403967deb1SAndreas Gruenbacher drbd_free_peer_req(mdev, peer_req); 244182bc0194SAndreas Gruenbacher return -EIO; 2442b411b363SPhilipp Reisner } 2443b411b363SPhilipp Reisner 2444b411b363SPhilipp Reisner static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local) 2445b411b363SPhilipp Reisner { 2446b411b363SPhilipp Reisner int self, peer, rv = -100; 2447b411b363SPhilipp Reisner unsigned long ch_self, ch_peer; 244844ed167dSPhilipp Reisner enum drbd_after_sb_p after_sb_0p; 2449b411b363SPhilipp Reisner 2450b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & 1; 2451b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & 1; 2452b411b363SPhilipp Reisner 2453b411b363SPhilipp Reisner ch_peer = mdev->p_uuid[UI_SIZE]; 2454b411b363SPhilipp Reisner ch_self = mdev->comm_bm_set; 2455b411b363SPhilipp Reisner 245644ed167dSPhilipp Reisner rcu_read_lock(); 245744ed167dSPhilipp Reisner after_sb_0p = rcu_dereference(mdev->tconn->net_conf)->after_sb_0p; 245844ed167dSPhilipp Reisner rcu_read_unlock(); 245944ed167dSPhilipp Reisner switch (after_sb_0p) { 2460b411b363SPhilipp Reisner case ASB_CONSENSUS: 2461b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2462b411b363SPhilipp Reisner case ASB_CALL_HELPER: 246344ed167dSPhilipp Reisner case ASB_VIOLENTLY: 2464b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2465b411b363SPhilipp Reisner break; 2466b411b363SPhilipp Reisner case ASB_DISCONNECT: 2467b411b363SPhilipp Reisner break; 2468b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2469b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2470b411b363SPhilipp Reisner rv = -1; 2471b411b363SPhilipp Reisner break; 2472b411b363SPhilipp Reisner } 2473b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2474b411b363SPhilipp Reisner rv = 1; 2475b411b363SPhilipp Reisner break; 2476b411b363SPhilipp Reisner } 2477b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2478b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2479b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2480b411b363SPhilipp Reisner rv = 1; 2481b411b363SPhilipp Reisner break; 2482b411b363SPhilipp Reisner } 2483b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2484b411b363SPhilipp Reisner rv = -1; 2485b411b363SPhilipp Reisner break; 2486b411b363SPhilipp Reisner } 2487b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2488ad19bf6eSLars Ellenberg dev_warn(DEV, "Discard younger/older primary did not find a decision\n" 2489b411b363SPhilipp Reisner "Using discard-least-changes instead\n"); 2490b411b363SPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2491b411b363SPhilipp Reisner if (ch_peer == 0 && ch_self == 0) { 249225703f83SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) 2493b411b363SPhilipp Reisner ? -1 : 1; 2494b411b363SPhilipp Reisner break; 2495b411b363SPhilipp Reisner } else { 2496b411b363SPhilipp Reisner if (ch_peer == 0) { rv = 1; break; } 2497b411b363SPhilipp Reisner if (ch_self == 0) { rv = -1; break; } 2498b411b363SPhilipp Reisner } 249944ed167dSPhilipp Reisner if (after_sb_0p == ASB_DISCARD_ZERO_CHG) 2500b411b363SPhilipp Reisner break; 2501b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2502b411b363SPhilipp Reisner if (ch_self < ch_peer) 2503b411b363SPhilipp Reisner rv = -1; 2504b411b363SPhilipp Reisner else if (ch_self > ch_peer) 2505b411b363SPhilipp Reisner rv = 1; 2506b411b363SPhilipp Reisner else /* ( ch_self == ch_peer ) */ 2507b411b363SPhilipp Reisner /* Well, then use something else. */ 250825703f83SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) 2509b411b363SPhilipp Reisner ? -1 : 1; 2510b411b363SPhilipp Reisner break; 2511b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2512b411b363SPhilipp Reisner rv = -1; 2513b411b363SPhilipp Reisner break; 2514b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2515b411b363SPhilipp Reisner rv = 1; 2516b411b363SPhilipp Reisner } 2517b411b363SPhilipp Reisner 2518b411b363SPhilipp Reisner return rv; 2519b411b363SPhilipp Reisner } 2520b411b363SPhilipp Reisner 2521b411b363SPhilipp Reisner static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local) 2522b411b363SPhilipp Reisner { 25236184ea21SAndreas Gruenbacher int hg, rv = -100; 252444ed167dSPhilipp Reisner enum drbd_after_sb_p after_sb_1p; 2525b411b363SPhilipp Reisner 252644ed167dSPhilipp Reisner rcu_read_lock(); 252744ed167dSPhilipp Reisner after_sb_1p = rcu_dereference(mdev->tconn->net_conf)->after_sb_1p; 252844ed167dSPhilipp Reisner rcu_read_unlock(); 252944ed167dSPhilipp Reisner switch (after_sb_1p) { 2530b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2531b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2532b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2533b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2534b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 253544ed167dSPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2536b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2537b411b363SPhilipp Reisner break; 2538b411b363SPhilipp Reisner case ASB_DISCONNECT: 2539b411b363SPhilipp Reisner break; 2540b411b363SPhilipp Reisner case ASB_CONSENSUS: 2541b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2542b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_SECONDARY) 2543b411b363SPhilipp Reisner rv = hg; 2544b411b363SPhilipp Reisner if (hg == 1 && mdev->state.role == R_PRIMARY) 2545b411b363SPhilipp Reisner rv = hg; 2546b411b363SPhilipp Reisner break; 2547b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2548b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2549b411b363SPhilipp Reisner break; 2550b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2551b411b363SPhilipp Reisner return mdev->state.role == R_PRIMARY ? 1 : -1; 2552b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2553b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2554b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_PRIMARY) { 2555bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2556bb437946SAndreas Gruenbacher 2557bb437946SAndreas Gruenbacher drbd_set_role(mdev, R_SECONDARY, 0); 2558b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2559b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2560b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2561bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2562bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2563b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2564b411b363SPhilipp Reisner } else { 2565b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2566b411b363SPhilipp Reisner rv = hg; 2567b411b363SPhilipp Reisner } 2568b411b363SPhilipp Reisner } else 2569b411b363SPhilipp Reisner rv = hg; 2570b411b363SPhilipp Reisner } 2571b411b363SPhilipp Reisner 2572b411b363SPhilipp Reisner return rv; 2573b411b363SPhilipp Reisner } 2574b411b363SPhilipp Reisner 2575b411b363SPhilipp Reisner static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local) 2576b411b363SPhilipp Reisner { 25776184ea21SAndreas Gruenbacher int hg, rv = -100; 257844ed167dSPhilipp Reisner enum drbd_after_sb_p after_sb_2p; 2579b411b363SPhilipp Reisner 258044ed167dSPhilipp Reisner rcu_read_lock(); 258144ed167dSPhilipp Reisner after_sb_2p = rcu_dereference(mdev->tconn->net_conf)->after_sb_2p; 258244ed167dSPhilipp Reisner rcu_read_unlock(); 258344ed167dSPhilipp Reisner switch (after_sb_2p) { 2584b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2585b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2586b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2587b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2588b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2589b411b363SPhilipp Reisner case ASB_CONSENSUS: 2590b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 259144ed167dSPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2592b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2593b411b363SPhilipp Reisner break; 2594b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2595b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2596b411b363SPhilipp Reisner break; 2597b411b363SPhilipp Reisner case ASB_DISCONNECT: 2598b411b363SPhilipp Reisner break; 2599b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2600b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2601b411b363SPhilipp Reisner if (hg == -1) { 2602bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2603bb437946SAndreas Gruenbacher 2604b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2605b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2606b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2607bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2608bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2609b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2610b411b363SPhilipp Reisner } else { 2611b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2612b411b363SPhilipp Reisner rv = hg; 2613b411b363SPhilipp Reisner } 2614b411b363SPhilipp Reisner } else 2615b411b363SPhilipp Reisner rv = hg; 2616b411b363SPhilipp Reisner } 2617b411b363SPhilipp Reisner 2618b411b363SPhilipp Reisner return rv; 2619b411b363SPhilipp Reisner } 2620b411b363SPhilipp Reisner 2621b411b363SPhilipp Reisner static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid, 2622b411b363SPhilipp Reisner u64 bits, u64 flags) 2623b411b363SPhilipp Reisner { 2624b411b363SPhilipp Reisner if (!uuid) { 2625b411b363SPhilipp Reisner dev_info(DEV, "%s uuid info vanished while I was looking!\n", text); 2626b411b363SPhilipp Reisner return; 2627b411b363SPhilipp Reisner } 2628b411b363SPhilipp Reisner dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", 2629b411b363SPhilipp Reisner text, 2630b411b363SPhilipp Reisner (unsigned long long)uuid[UI_CURRENT], 2631b411b363SPhilipp Reisner (unsigned long long)uuid[UI_BITMAP], 2632b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_START], 2633b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_END], 2634b411b363SPhilipp Reisner (unsigned long long)bits, 2635b411b363SPhilipp Reisner (unsigned long long)flags); 2636b411b363SPhilipp Reisner } 2637b411b363SPhilipp Reisner 2638b411b363SPhilipp Reisner /* 2639b411b363SPhilipp Reisner 100 after split brain try auto recover 2640b411b363SPhilipp Reisner 2 C_SYNC_SOURCE set BitMap 2641b411b363SPhilipp Reisner 1 C_SYNC_SOURCE use BitMap 2642b411b363SPhilipp Reisner 0 no Sync 2643b411b363SPhilipp Reisner -1 C_SYNC_TARGET use BitMap 2644b411b363SPhilipp Reisner -2 C_SYNC_TARGET set BitMap 2645b411b363SPhilipp Reisner -100 after split brain, disconnect 2646b411b363SPhilipp Reisner -1000 unrelated data 26474a23f264SPhilipp Reisner -1091 requires proto 91 26484a23f264SPhilipp Reisner -1096 requires proto 96 2649b411b363SPhilipp Reisner */ 2650b411b363SPhilipp Reisner static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local) 2651b411b363SPhilipp Reisner { 2652b411b363SPhilipp Reisner u64 self, peer; 2653b411b363SPhilipp Reisner int i, j; 2654b411b363SPhilipp Reisner 2655b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2656b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2657b411b363SPhilipp Reisner 2658b411b363SPhilipp Reisner *rule_nr = 10; 2659b411b363SPhilipp Reisner if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) 2660b411b363SPhilipp Reisner return 0; 2661b411b363SPhilipp Reisner 2662b411b363SPhilipp Reisner *rule_nr = 20; 2663b411b363SPhilipp Reisner if ((self == UUID_JUST_CREATED || self == (u64)0) && 2664b411b363SPhilipp Reisner peer != UUID_JUST_CREATED) 2665b411b363SPhilipp Reisner return -2; 2666b411b363SPhilipp Reisner 2667b411b363SPhilipp Reisner *rule_nr = 30; 2668b411b363SPhilipp Reisner if (self != UUID_JUST_CREATED && 2669b411b363SPhilipp Reisner (peer == UUID_JUST_CREATED || peer == (u64)0)) 2670b411b363SPhilipp Reisner return 2; 2671b411b363SPhilipp Reisner 2672b411b363SPhilipp Reisner if (self == peer) { 2673b411b363SPhilipp Reisner int rct, dc; /* roles at crash time */ 2674b411b363SPhilipp Reisner 2675b411b363SPhilipp Reisner if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) { 2676b411b363SPhilipp Reisner 267731890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 26784a23f264SPhilipp Reisner return -1091; 2679b411b363SPhilipp Reisner 2680b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) && 2681b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { 2682b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n"); 2683b411b363SPhilipp Reisner drbd_uuid_set_bm(mdev, 0UL); 2684b411b363SPhilipp Reisner 2685b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2686b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2687b411b363SPhilipp Reisner *rule_nr = 34; 2688b411b363SPhilipp Reisner } else { 2689b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n"); 2690b411b363SPhilipp Reisner *rule_nr = 36; 2691b411b363SPhilipp Reisner } 2692b411b363SPhilipp Reisner 2693b411b363SPhilipp Reisner return 1; 2694b411b363SPhilipp Reisner } 2695b411b363SPhilipp Reisner 2696b411b363SPhilipp Reisner if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) { 2697b411b363SPhilipp Reisner 269831890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 26994a23f264SPhilipp Reisner return -1091; 2700b411b363SPhilipp Reisner 2701b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) && 2702b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) { 2703b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); 2704b411b363SPhilipp Reisner 2705b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START]; 2706b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP]; 2707b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = 0UL; 2708b411b363SPhilipp Reisner 2709b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2710b411b363SPhilipp Reisner *rule_nr = 35; 2711b411b363SPhilipp Reisner } else { 2712b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n"); 2713b411b363SPhilipp Reisner *rule_nr = 37; 2714b411b363SPhilipp Reisner } 2715b411b363SPhilipp Reisner 2716b411b363SPhilipp Reisner return -1; 2717b411b363SPhilipp Reisner } 2718b411b363SPhilipp Reisner 2719b411b363SPhilipp Reisner /* Common power [off|failure] */ 2720b411b363SPhilipp Reisner rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) + 2721b411b363SPhilipp Reisner (mdev->p_uuid[UI_FLAGS] & 2); 2722b411b363SPhilipp Reisner /* lowest bit is set when we were primary, 2723b411b363SPhilipp Reisner * next bit (weight 2) is set when peer was primary */ 2724b411b363SPhilipp Reisner *rule_nr = 40; 2725b411b363SPhilipp Reisner 2726b411b363SPhilipp Reisner switch (rct) { 2727b411b363SPhilipp Reisner case 0: /* !self_pri && !peer_pri */ return 0; 2728b411b363SPhilipp Reisner case 1: /* self_pri && !peer_pri */ return 1; 2729b411b363SPhilipp Reisner case 2: /* !self_pri && peer_pri */ return -1; 2730b411b363SPhilipp Reisner case 3: /* self_pri && peer_pri */ 273125703f83SPhilipp Reisner dc = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags); 2732b411b363SPhilipp Reisner return dc ? -1 : 1; 2733b411b363SPhilipp Reisner } 2734b411b363SPhilipp Reisner } 2735b411b363SPhilipp Reisner 2736b411b363SPhilipp Reisner *rule_nr = 50; 2737b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2738b411b363SPhilipp Reisner if (self == peer) 2739b411b363SPhilipp Reisner return -1; 2740b411b363SPhilipp Reisner 2741b411b363SPhilipp Reisner *rule_nr = 51; 2742b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); 2743b411b363SPhilipp Reisner if (self == peer) { 274431890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 96 ? 27454a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == 27464a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) : 27474a23f264SPhilipp Reisner peer + UUID_NEW_BM_OFFSET == (mdev->p_uuid[UI_BITMAP] & ~((u64)1))) { 2748b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2749b411b363SPhilipp Reisner resync as sync source modifications of the peer's UUIDs. */ 2750b411b363SPhilipp Reisner 275131890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 27524a23f264SPhilipp Reisner return -1091; 2753b411b363SPhilipp Reisner 2754b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START]; 2755b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1]; 27564a23f264SPhilipp Reisner 27574a23f264SPhilipp Reisner dev_info(DEV, "Did not got last syncUUID packet, corrected:\n"); 27584a23f264SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 27594a23f264SPhilipp Reisner 2760b411b363SPhilipp Reisner return -1; 2761b411b363SPhilipp Reisner } 2762b411b363SPhilipp Reisner } 2763b411b363SPhilipp Reisner 2764b411b363SPhilipp Reisner *rule_nr = 60; 2765b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2766b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2767b411b363SPhilipp Reisner peer = mdev->p_uuid[i] & ~((u64)1); 2768b411b363SPhilipp Reisner if (self == peer) 2769b411b363SPhilipp Reisner return -2; 2770b411b363SPhilipp Reisner } 2771b411b363SPhilipp Reisner 2772b411b363SPhilipp Reisner *rule_nr = 70; 2773b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2774b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2775b411b363SPhilipp Reisner if (self == peer) 2776b411b363SPhilipp Reisner return 1; 2777b411b363SPhilipp Reisner 2778b411b363SPhilipp Reisner *rule_nr = 71; 2779b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); 2780b411b363SPhilipp Reisner if (self == peer) { 278131890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 96 ? 27824a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == 27834a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) : 27844a23f264SPhilipp Reisner self + UUID_NEW_BM_OFFSET == (mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) { 2785b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2786b411b363SPhilipp Reisner resync as sync source modifications of our UUIDs. */ 2787b411b363SPhilipp Reisner 278831890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 27894a23f264SPhilipp Reisner return -1091; 2790b411b363SPhilipp Reisner 2791b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]); 2792b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]); 2793b411b363SPhilipp Reisner 27944a23f264SPhilipp Reisner dev_info(DEV, "Last syncUUID did not get through, corrected:\n"); 2795b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2796b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2797b411b363SPhilipp Reisner 2798b411b363SPhilipp Reisner return 1; 2799b411b363SPhilipp Reisner } 2800b411b363SPhilipp Reisner } 2801b411b363SPhilipp Reisner 2802b411b363SPhilipp Reisner 2803b411b363SPhilipp Reisner *rule_nr = 80; 2804d8c2a36bSPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2805b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2806b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2807b411b363SPhilipp Reisner if (self == peer) 2808b411b363SPhilipp Reisner return 2; 2809b411b363SPhilipp Reisner } 2810b411b363SPhilipp Reisner 2811b411b363SPhilipp Reisner *rule_nr = 90; 2812b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2813b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2814b411b363SPhilipp Reisner if (self == peer && self != ((u64)0)) 2815b411b363SPhilipp Reisner return 100; 2816b411b363SPhilipp Reisner 2817b411b363SPhilipp Reisner *rule_nr = 100; 2818b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2819b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2820b411b363SPhilipp Reisner for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { 2821b411b363SPhilipp Reisner peer = mdev->p_uuid[j] & ~((u64)1); 2822b411b363SPhilipp Reisner if (self == peer) 2823b411b363SPhilipp Reisner return -100; 2824b411b363SPhilipp Reisner } 2825b411b363SPhilipp Reisner } 2826b411b363SPhilipp Reisner 2827b411b363SPhilipp Reisner return -1000; 2828b411b363SPhilipp Reisner } 2829b411b363SPhilipp Reisner 2830b411b363SPhilipp Reisner /* drbd_sync_handshake() returns the new conn state on success, or 2831b411b363SPhilipp Reisner CONN_MASK (-1) on failure. 2832b411b363SPhilipp Reisner */ 2833b411b363SPhilipp Reisner static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role, 2834b411b363SPhilipp Reisner enum drbd_disk_state peer_disk) __must_hold(local) 2835b411b363SPhilipp Reisner { 2836b411b363SPhilipp Reisner enum drbd_conns rv = C_MASK; 2837b411b363SPhilipp Reisner enum drbd_disk_state mydisk; 283844ed167dSPhilipp Reisner struct net_conf *nc; 283944ed167dSPhilipp Reisner int hg, rule_nr, rr_conflict, dry_run; 2840b411b363SPhilipp Reisner 2841b411b363SPhilipp Reisner mydisk = mdev->state.disk; 2842b411b363SPhilipp Reisner if (mydisk == D_NEGOTIATING) 2843b411b363SPhilipp Reisner mydisk = mdev->new_state_tmp.disk; 2844b411b363SPhilipp Reisner 2845b411b363SPhilipp Reisner dev_info(DEV, "drbd_sync_handshake:\n"); 2846b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0); 2847b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, 2848b411b363SPhilipp Reisner mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2849b411b363SPhilipp Reisner 2850b411b363SPhilipp Reisner hg = drbd_uuid_compare(mdev, &rule_nr); 2851b411b363SPhilipp Reisner 2852b411b363SPhilipp Reisner dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr); 2853b411b363SPhilipp Reisner 2854b411b363SPhilipp Reisner if (hg == -1000) { 2855b411b363SPhilipp Reisner dev_alert(DEV, "Unrelated data, aborting!\n"); 2856b411b363SPhilipp Reisner return C_MASK; 2857b411b363SPhilipp Reisner } 28584a23f264SPhilipp Reisner if (hg < -1000) { 28594a23f264SPhilipp Reisner dev_alert(DEV, "To resolve this both sides have to support at least protocol %d\n", -hg - 1000); 2860b411b363SPhilipp Reisner return C_MASK; 2861b411b363SPhilipp Reisner } 2862b411b363SPhilipp Reisner 2863b411b363SPhilipp Reisner if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || 2864b411b363SPhilipp Reisner (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { 2865b411b363SPhilipp Reisner int f = (hg == -100) || abs(hg) == 2; 2866b411b363SPhilipp Reisner hg = mydisk > D_INCONSISTENT ? 1 : -1; 2867b411b363SPhilipp Reisner if (f) 2868b411b363SPhilipp Reisner hg = hg*2; 2869b411b363SPhilipp Reisner dev_info(DEV, "Becoming sync %s due to disk states.\n", 2870b411b363SPhilipp Reisner hg > 0 ? "source" : "target"); 2871b411b363SPhilipp Reisner } 2872b411b363SPhilipp Reisner 28733a11a487SAdam Gandelman if (abs(hg) == 100) 28743a11a487SAdam Gandelman drbd_khelper(mdev, "initial-split-brain"); 28753a11a487SAdam Gandelman 287644ed167dSPhilipp Reisner rcu_read_lock(); 287744ed167dSPhilipp Reisner nc = rcu_dereference(mdev->tconn->net_conf); 287844ed167dSPhilipp Reisner 287944ed167dSPhilipp Reisner if (hg == 100 || (hg == -100 && nc->always_asbp)) { 2880b411b363SPhilipp Reisner int pcount = (mdev->state.role == R_PRIMARY) 2881b411b363SPhilipp Reisner + (peer_role == R_PRIMARY); 2882b411b363SPhilipp Reisner int forced = (hg == -100); 2883b411b363SPhilipp Reisner 2884b411b363SPhilipp Reisner switch (pcount) { 2885b411b363SPhilipp Reisner case 0: 2886b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2887b411b363SPhilipp Reisner break; 2888b411b363SPhilipp Reisner case 1: 2889b411b363SPhilipp Reisner hg = drbd_asb_recover_1p(mdev); 2890b411b363SPhilipp Reisner break; 2891b411b363SPhilipp Reisner case 2: 2892b411b363SPhilipp Reisner hg = drbd_asb_recover_2p(mdev); 2893b411b363SPhilipp Reisner break; 2894b411b363SPhilipp Reisner } 2895b411b363SPhilipp Reisner if (abs(hg) < 100) { 2896b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, %d primaries, " 2897b411b363SPhilipp Reisner "automatically solved. Sync from %s node\n", 2898b411b363SPhilipp Reisner pcount, (hg < 0) ? "peer" : "this"); 2899b411b363SPhilipp Reisner if (forced) { 2900b411b363SPhilipp Reisner dev_warn(DEV, "Doing a full sync, since" 2901b411b363SPhilipp Reisner " UUIDs where ambiguous.\n"); 2902b411b363SPhilipp Reisner hg = hg*2; 2903b411b363SPhilipp Reisner } 2904b411b363SPhilipp Reisner } 2905b411b363SPhilipp Reisner } 2906b411b363SPhilipp Reisner 2907b411b363SPhilipp Reisner if (hg == -100) { 29086139f60dSAndreas Gruenbacher if (nc->discard_my_data && !(mdev->p_uuid[UI_FLAGS]&1)) 2909b411b363SPhilipp Reisner hg = -1; 29106139f60dSAndreas Gruenbacher if (!nc->discard_my_data && (mdev->p_uuid[UI_FLAGS]&1)) 2911b411b363SPhilipp Reisner hg = 1; 2912b411b363SPhilipp Reisner 2913b411b363SPhilipp Reisner if (abs(hg) < 100) 2914b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, manually solved. " 2915b411b363SPhilipp Reisner "Sync from %s node\n", 2916b411b363SPhilipp Reisner (hg < 0) ? "peer" : "this"); 2917b411b363SPhilipp Reisner } 291844ed167dSPhilipp Reisner rr_conflict = nc->rr_conflict; 291944ed167dSPhilipp Reisner dry_run = nc->dry_run; 292044ed167dSPhilipp Reisner rcu_read_unlock(); 2921b411b363SPhilipp Reisner 2922b411b363SPhilipp Reisner if (hg == -100) { 2923580b9767SLars Ellenberg /* FIXME this log message is not correct if we end up here 2924580b9767SLars Ellenberg * after an attempted attach on a diskless node. 2925580b9767SLars Ellenberg * We just refuse to attach -- well, we drop the "connection" 2926580b9767SLars Ellenberg * to that disk, in a way... */ 29273a11a487SAdam Gandelman dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n"); 2928b411b363SPhilipp Reisner drbd_khelper(mdev, "split-brain"); 2929b411b363SPhilipp Reisner return C_MASK; 2930b411b363SPhilipp Reisner } 2931b411b363SPhilipp Reisner 2932b411b363SPhilipp Reisner if (hg > 0 && mydisk <= D_INCONSISTENT) { 2933b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n"); 2934b411b363SPhilipp Reisner return C_MASK; 2935b411b363SPhilipp Reisner } 2936b411b363SPhilipp Reisner 2937b411b363SPhilipp Reisner if (hg < 0 && /* by intention we do not use mydisk here. */ 2938b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) { 293944ed167dSPhilipp Reisner switch (rr_conflict) { 2940b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2941b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost"); 2942b411b363SPhilipp Reisner /* fall through */ 2943b411b363SPhilipp Reisner case ASB_DISCONNECT: 2944b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncTarget, but I am primary!\n"); 2945b411b363SPhilipp Reisner return C_MASK; 2946b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2947b411b363SPhilipp Reisner dev_warn(DEV, "Becoming SyncTarget, violating the stable-data" 2948b411b363SPhilipp Reisner "assumption\n"); 2949b411b363SPhilipp Reisner } 2950b411b363SPhilipp Reisner } 2951b411b363SPhilipp Reisner 295244ed167dSPhilipp Reisner if (dry_run || test_bit(CONN_DRY_RUN, &mdev->tconn->flags)) { 2953cf14c2e9SPhilipp Reisner if (hg == 0) 2954cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n"); 2955cf14c2e9SPhilipp Reisner else 2956cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.", 2957cf14c2e9SPhilipp Reisner drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), 2958cf14c2e9SPhilipp Reisner abs(hg) >= 2 ? "full" : "bit-map based"); 2959cf14c2e9SPhilipp Reisner return C_MASK; 2960cf14c2e9SPhilipp Reisner } 2961cf14c2e9SPhilipp Reisner 2962b411b363SPhilipp Reisner if (abs(hg) >= 2) { 2963b411b363SPhilipp Reisner dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); 296420ceb2b2SLars Ellenberg if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake", 296520ceb2b2SLars Ellenberg BM_LOCKED_SET_ALLOWED)) 2966b411b363SPhilipp Reisner return C_MASK; 2967b411b363SPhilipp Reisner } 2968b411b363SPhilipp Reisner 2969b411b363SPhilipp Reisner if (hg > 0) { /* become sync source. */ 2970b411b363SPhilipp Reisner rv = C_WF_BITMAP_S; 2971b411b363SPhilipp Reisner } else if (hg < 0) { /* become sync target */ 2972b411b363SPhilipp Reisner rv = C_WF_BITMAP_T; 2973b411b363SPhilipp Reisner } else { 2974b411b363SPhilipp Reisner rv = C_CONNECTED; 2975b411b363SPhilipp Reisner if (drbd_bm_total_weight(mdev)) { 2976b411b363SPhilipp Reisner dev_info(DEV, "No resync, but %lu bits in bitmap!\n", 2977b411b363SPhilipp Reisner drbd_bm_total_weight(mdev)); 2978b411b363SPhilipp Reisner } 2979b411b363SPhilipp Reisner } 2980b411b363SPhilipp Reisner 2981b411b363SPhilipp Reisner return rv; 2982b411b363SPhilipp Reisner } 2983b411b363SPhilipp Reisner 2984f179d76dSPhilipp Reisner static enum drbd_after_sb_p convert_after_sb(enum drbd_after_sb_p peer) 2985b411b363SPhilipp Reisner { 2986b411b363SPhilipp Reisner /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ 2987f179d76dSPhilipp Reisner if (peer == ASB_DISCARD_REMOTE) 2988f179d76dSPhilipp Reisner return ASB_DISCARD_LOCAL; 2989b411b363SPhilipp Reisner 2990b411b363SPhilipp Reisner /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ 2991f179d76dSPhilipp Reisner if (peer == ASB_DISCARD_LOCAL) 2992f179d76dSPhilipp Reisner return ASB_DISCARD_REMOTE; 2993b411b363SPhilipp Reisner 2994b411b363SPhilipp Reisner /* everything else is valid if they are equal on both sides. */ 2995f179d76dSPhilipp Reisner return peer; 2996b411b363SPhilipp Reisner } 2997b411b363SPhilipp Reisner 2998e2857216SAndreas Gruenbacher static int receive_protocol(struct drbd_tconn *tconn, struct packet_info *pi) 2999b411b363SPhilipp Reisner { 3000e658983aSAndreas Gruenbacher struct p_protocol *p = pi->data; 3001036b17eaSPhilipp Reisner enum drbd_after_sb_p p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; 3002036b17eaSPhilipp Reisner int p_proto, p_discard_my_data, p_two_primaries, cf; 3003036b17eaSPhilipp Reisner struct net_conf *nc, *old_net_conf, *new_net_conf = NULL; 3004036b17eaSPhilipp Reisner char integrity_alg[SHARED_SECRET_MAX] = ""; 3005036b17eaSPhilipp Reisner struct crypto_hash *peer_tfm = NULL, *tfm = NULL; 30067aca6c75SPhilipp Reisner void *int_dig_in = NULL, *int_dig_vv = NULL; 3007b411b363SPhilipp Reisner 3008b411b363SPhilipp Reisner p_proto = be32_to_cpu(p->protocol); 3009b411b363SPhilipp Reisner p_after_sb_0p = be32_to_cpu(p->after_sb_0p); 3010b411b363SPhilipp Reisner p_after_sb_1p = be32_to_cpu(p->after_sb_1p); 3011b411b363SPhilipp Reisner p_after_sb_2p = be32_to_cpu(p->after_sb_2p); 3012b411b363SPhilipp Reisner p_two_primaries = be32_to_cpu(p->two_primaries); 3013cf14c2e9SPhilipp Reisner cf = be32_to_cpu(p->conn_flags); 30146139f60dSAndreas Gruenbacher p_discard_my_data = cf & CF_DISCARD_MY_DATA; 3015cf14c2e9SPhilipp Reisner 301686db0618SAndreas Gruenbacher if (tconn->agreed_pro_version >= 87) { 301786db0618SAndreas Gruenbacher int err; 301886db0618SAndreas Gruenbacher 301988104ca4SAndreas Gruenbacher if (pi->size > sizeof(integrity_alg)) 302086db0618SAndreas Gruenbacher return -EIO; 302188104ca4SAndreas Gruenbacher err = drbd_recv_all(tconn, integrity_alg, pi->size); 302286db0618SAndreas Gruenbacher if (err) 302386db0618SAndreas Gruenbacher return err; 302488104ca4SAndreas Gruenbacher integrity_alg[SHARED_SECRET_MAX - 1] = 0; 3025036b17eaSPhilipp Reisner } 302686db0618SAndreas Gruenbacher 3027036b17eaSPhilipp Reisner if (pi->cmd == P_PROTOCOL_UPDATE) { 302888104ca4SAndreas Gruenbacher if (integrity_alg[0]) { 30297aca6c75SPhilipp Reisner int hash_size; 30307aca6c75SPhilipp Reisner 3031036b17eaSPhilipp Reisner peer_tfm = crypto_alloc_hash(integrity_alg, 0, CRYPTO_ALG_ASYNC); 303288104ca4SAndreas Gruenbacher tfm = crypto_alloc_hash(integrity_alg, 0, CRYPTO_ALG_ASYNC); 3033036b17eaSPhilipp Reisner if (!(peer_tfm && tfm)) { 303488104ca4SAndreas Gruenbacher conn_err(tconn, "peer data-integrity-alg %s not supported\n", 303588104ca4SAndreas Gruenbacher integrity_alg); 303688104ca4SAndreas Gruenbacher goto disconnect; 303788104ca4SAndreas Gruenbacher } 30387aca6c75SPhilipp Reisner 30397aca6c75SPhilipp Reisner hash_size = crypto_hash_digestsize(tfm); 30407aca6c75SPhilipp Reisner int_dig_in = kmalloc(hash_size, GFP_KERNEL); 30417aca6c75SPhilipp Reisner int_dig_vv = kmalloc(hash_size, GFP_KERNEL); 30427aca6c75SPhilipp Reisner if (!(int_dig_in && int_dig_vv)) { 3043036b17eaSPhilipp Reisner conn_err(tconn, "Allocation of buffers for data integrity checking failed\n"); 30447aca6c75SPhilipp Reisner goto disconnect; 30457aca6c75SPhilipp Reisner } 304688104ca4SAndreas Gruenbacher } 304788104ca4SAndreas Gruenbacher 3048036b17eaSPhilipp Reisner new_net_conf = kmalloc(sizeof(struct net_conf), GFP_KERNEL); 3049036b17eaSPhilipp Reisner if (!new_net_conf) { 3050036b17eaSPhilipp Reisner conn_err(tconn, "Allocation of new net_conf failed\n"); 3051036b17eaSPhilipp Reisner goto disconnect; 3052036b17eaSPhilipp Reisner } 3053036b17eaSPhilipp Reisner 3054036b17eaSPhilipp Reisner mutex_lock(&tconn->data.mutex); 3055036b17eaSPhilipp Reisner mutex_lock(&tconn->conf_update); 3056036b17eaSPhilipp Reisner old_net_conf = tconn->net_conf; 3057036b17eaSPhilipp Reisner *new_net_conf = *old_net_conf; 3058036b17eaSPhilipp Reisner 3059036b17eaSPhilipp Reisner new_net_conf->wire_protocol = p_proto; 3060036b17eaSPhilipp Reisner new_net_conf->after_sb_0p = convert_after_sb(p_after_sb_0p); 3061036b17eaSPhilipp Reisner new_net_conf->after_sb_1p = convert_after_sb(p_after_sb_1p); 3062036b17eaSPhilipp Reisner new_net_conf->after_sb_2p = convert_after_sb(p_after_sb_2p); 3063036b17eaSPhilipp Reisner new_net_conf->two_primaries = p_two_primaries; 3064036b17eaSPhilipp Reisner strcpy(new_net_conf->integrity_alg, integrity_alg); 3065036b17eaSPhilipp Reisner new_net_conf->integrity_alg_len = strlen(integrity_alg) + 1; 3066036b17eaSPhilipp Reisner 3067036b17eaSPhilipp Reisner crypto_free_hash(tconn->integrity_tfm); 3068036b17eaSPhilipp Reisner tconn->integrity_tfm = tfm; 3069036b17eaSPhilipp Reisner 3070036b17eaSPhilipp Reisner rcu_assign_pointer(tconn->net_conf, new_net_conf); 3071036b17eaSPhilipp Reisner mutex_unlock(&tconn->conf_update); 3072036b17eaSPhilipp Reisner mutex_unlock(&tconn->data.mutex); 3073036b17eaSPhilipp Reisner 307488104ca4SAndreas Gruenbacher crypto_free_hash(tconn->peer_integrity_tfm); 30757aca6c75SPhilipp Reisner kfree(tconn->int_dig_in); 30767aca6c75SPhilipp Reisner kfree(tconn->int_dig_vv); 3077036b17eaSPhilipp Reisner tconn->peer_integrity_tfm = peer_tfm; 30787aca6c75SPhilipp Reisner tconn->int_dig_in = int_dig_in; 30797aca6c75SPhilipp Reisner tconn->int_dig_vv = int_dig_vv; 3080036b17eaSPhilipp Reisner 3081036b17eaSPhilipp Reisner if (strcmp(old_net_conf->integrity_alg, integrity_alg)) 3082036b17eaSPhilipp Reisner conn_info(tconn, "peer data-integrity-alg: %s\n", integrity_alg); 3083036b17eaSPhilipp Reisner 3084036b17eaSPhilipp Reisner synchronize_rcu(); 3085036b17eaSPhilipp Reisner kfree(old_net_conf); 3086036b17eaSPhilipp Reisner 3087036b17eaSPhilipp Reisner return 0; 308886db0618SAndreas Gruenbacher } 308986db0618SAndreas Gruenbacher 30907204624cSPhilipp Reisner clear_bit(CONN_DRY_RUN, &tconn->flags); 3091cf14c2e9SPhilipp Reisner 3092cf14c2e9SPhilipp Reisner if (cf & CF_DRY_RUN) 30937204624cSPhilipp Reisner set_bit(CONN_DRY_RUN, &tconn->flags); 3094b411b363SPhilipp Reisner 309544ed167dSPhilipp Reisner rcu_read_lock(); 309644ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 309744ed167dSPhilipp Reisner 3098036b17eaSPhilipp Reisner if (p_proto != nc->wire_protocol) { 30997204624cSPhilipp Reisner conn_err(tconn, "incompatible communication protocols\n"); 310044ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3101b411b363SPhilipp Reisner } 3102b411b363SPhilipp Reisner 3103f179d76dSPhilipp Reisner if (convert_after_sb(p_after_sb_0p) != nc->after_sb_0p) { 31047204624cSPhilipp Reisner conn_err(tconn, "incompatible after-sb-0pri settings\n"); 310544ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3106b411b363SPhilipp Reisner } 3107b411b363SPhilipp Reisner 3108f179d76dSPhilipp Reisner if (convert_after_sb(p_after_sb_1p) != nc->after_sb_1p) { 31097204624cSPhilipp Reisner conn_err(tconn, "incompatible after-sb-1pri settings\n"); 311044ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3111b411b363SPhilipp Reisner } 3112b411b363SPhilipp Reisner 3113f179d76dSPhilipp Reisner if (convert_after_sb(p_after_sb_2p) != nc->after_sb_2p) { 31147204624cSPhilipp Reisner conn_err(tconn, "incompatible after-sb-2pri settings\n"); 311544ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3116b411b363SPhilipp Reisner } 3117b411b363SPhilipp Reisner 31186139f60dSAndreas Gruenbacher if (p_discard_my_data && nc->discard_my_data) { 31196139f60dSAndreas Gruenbacher conn_err(tconn, "both sides have the 'discard_my_data' flag set\n"); 312044ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3121b411b363SPhilipp Reisner } 3122b411b363SPhilipp Reisner 312344ed167dSPhilipp Reisner if (p_two_primaries != nc->two_primaries) { 31247204624cSPhilipp Reisner conn_err(tconn, "incompatible setting of the two-primaries options\n"); 312544ed167dSPhilipp Reisner goto disconnect_rcu_unlock; 3126b411b363SPhilipp Reisner } 3127b411b363SPhilipp Reisner 3128036b17eaSPhilipp Reisner if (strcmp(integrity_alg, nc->integrity_alg)) { 3129036b17eaSPhilipp Reisner conn_err(tconn, "incompatible setting of the data-integrity-alg\n"); 3130036b17eaSPhilipp Reisner goto disconnect_rcu_unlock; 3131036b17eaSPhilipp Reisner } 3132036b17eaSPhilipp Reisner 313386db0618SAndreas Gruenbacher rcu_read_unlock(); 313486db0618SAndreas Gruenbacher 313582bc0194SAndreas Gruenbacher return 0; 3136b411b363SPhilipp Reisner 313744ed167dSPhilipp Reisner disconnect_rcu_unlock: 313844ed167dSPhilipp Reisner rcu_read_unlock(); 3139b411b363SPhilipp Reisner disconnect: 3140036b17eaSPhilipp Reisner crypto_free_hash(peer_tfm); 3141036b17eaSPhilipp Reisner crypto_free_hash(tfm); 3142036b17eaSPhilipp Reisner kfree(int_dig_in); 3143036b17eaSPhilipp Reisner kfree(int_dig_vv); 31447204624cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 314582bc0194SAndreas Gruenbacher return -EIO; 3146b411b363SPhilipp Reisner } 3147b411b363SPhilipp Reisner 3148b411b363SPhilipp Reisner /* helper function 3149b411b363SPhilipp Reisner * input: alg name, feature name 3150b411b363SPhilipp Reisner * return: NULL (alg name was "") 3151b411b363SPhilipp Reisner * ERR_PTR(error) if something goes wrong 3152b411b363SPhilipp Reisner * or the crypto hash ptr, if it worked out ok. */ 3153b411b363SPhilipp Reisner struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev, 3154b411b363SPhilipp Reisner const char *alg, const char *name) 3155b411b363SPhilipp Reisner { 3156b411b363SPhilipp Reisner struct crypto_hash *tfm; 3157b411b363SPhilipp Reisner 3158b411b363SPhilipp Reisner if (!alg[0]) 3159b411b363SPhilipp Reisner return NULL; 3160b411b363SPhilipp Reisner 3161b411b363SPhilipp Reisner tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC); 3162b411b363SPhilipp Reisner if (IS_ERR(tfm)) { 3163b411b363SPhilipp Reisner dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n", 3164b411b363SPhilipp Reisner alg, name, PTR_ERR(tfm)); 3165b411b363SPhilipp Reisner return tfm; 3166b411b363SPhilipp Reisner } 3167b411b363SPhilipp Reisner return tfm; 3168b411b363SPhilipp Reisner } 3169b411b363SPhilipp Reisner 31704a76b161SAndreas Gruenbacher static int ignore_remaining_packet(struct drbd_tconn *tconn, struct packet_info *pi) 3171b411b363SPhilipp Reisner { 31724a76b161SAndreas Gruenbacher void *buffer = tconn->data.rbuf; 31734a76b161SAndreas Gruenbacher int size = pi->size; 31744a76b161SAndreas Gruenbacher 31754a76b161SAndreas Gruenbacher while (size) { 31764a76b161SAndreas Gruenbacher int s = min_t(int, size, DRBD_SOCKET_BUFFER_SIZE); 31774a76b161SAndreas Gruenbacher s = drbd_recv(tconn, buffer, s); 31784a76b161SAndreas Gruenbacher if (s <= 0) { 31794a76b161SAndreas Gruenbacher if (s < 0) 31804a76b161SAndreas Gruenbacher return s; 31814a76b161SAndreas Gruenbacher break; 31824a76b161SAndreas Gruenbacher } 31834a76b161SAndreas Gruenbacher size -= s; 31844a76b161SAndreas Gruenbacher } 31854a76b161SAndreas Gruenbacher if (size) 31864a76b161SAndreas Gruenbacher return -EIO; 31874a76b161SAndreas Gruenbacher return 0; 31884a76b161SAndreas Gruenbacher } 31894a76b161SAndreas Gruenbacher 31904a76b161SAndreas Gruenbacher /* 31914a76b161SAndreas Gruenbacher * config_unknown_volume - device configuration command for unknown volume 31924a76b161SAndreas Gruenbacher * 31934a76b161SAndreas Gruenbacher * When a device is added to an existing connection, the node on which the 31944a76b161SAndreas Gruenbacher * device is added first will send configuration commands to its peer but the 31954a76b161SAndreas Gruenbacher * peer will not know about the device yet. It will warn and ignore these 31964a76b161SAndreas Gruenbacher * commands. Once the device is added on the second node, the second node will 31974a76b161SAndreas Gruenbacher * send the same device configuration commands, but in the other direction. 31984a76b161SAndreas Gruenbacher * 31994a76b161SAndreas Gruenbacher * (We can also end up here if drbd is misconfigured.) 32004a76b161SAndreas Gruenbacher */ 32014a76b161SAndreas Gruenbacher static int config_unknown_volume(struct drbd_tconn *tconn, struct packet_info *pi) 32024a76b161SAndreas Gruenbacher { 32034a76b161SAndreas Gruenbacher conn_warn(tconn, "Volume %u unknown; ignoring %s packet\n", 32044a76b161SAndreas Gruenbacher pi->vnr, cmdname(pi->cmd)); 32054a76b161SAndreas Gruenbacher return ignore_remaining_packet(tconn, pi); 32064a76b161SAndreas Gruenbacher } 32074a76b161SAndreas Gruenbacher 32084a76b161SAndreas Gruenbacher static int receive_SyncParam(struct drbd_tconn *tconn, struct packet_info *pi) 32094a76b161SAndreas Gruenbacher { 32104a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3211e658983aSAndreas Gruenbacher struct p_rs_param_95 *p; 3212b411b363SPhilipp Reisner unsigned int header_size, data_size, exp_max_sz; 3213b411b363SPhilipp Reisner struct crypto_hash *verify_tfm = NULL; 3214b411b363SPhilipp Reisner struct crypto_hash *csums_tfm = NULL; 32152ec91e0eSPhilipp Reisner struct net_conf *old_net_conf, *new_net_conf = NULL; 3216813472ceSPhilipp Reisner struct disk_conf *old_disk_conf = NULL, *new_disk_conf = NULL; 32174a76b161SAndreas Gruenbacher const int apv = tconn->agreed_pro_version; 3218813472ceSPhilipp Reisner struct fifo_buffer *old_plan = NULL, *new_plan = NULL; 3219778f271dSPhilipp Reisner int fifo_size = 0; 322082bc0194SAndreas Gruenbacher int err; 3221b411b363SPhilipp Reisner 32224a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 32234a76b161SAndreas Gruenbacher if (!mdev) 32244a76b161SAndreas Gruenbacher return config_unknown_volume(tconn, pi); 32254a76b161SAndreas Gruenbacher 3226b411b363SPhilipp Reisner exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) 3227b411b363SPhilipp Reisner : apv == 88 ? sizeof(struct p_rs_param) 3228b411b363SPhilipp Reisner + SHARED_SECRET_MAX 32298e26f9ccSPhilipp Reisner : apv <= 94 ? sizeof(struct p_rs_param_89) 32308e26f9ccSPhilipp Reisner : /* apv >= 95 */ sizeof(struct p_rs_param_95); 3231b411b363SPhilipp Reisner 3232e2857216SAndreas Gruenbacher if (pi->size > exp_max_sz) { 3233b411b363SPhilipp Reisner dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n", 3234e2857216SAndreas Gruenbacher pi->size, exp_max_sz); 323582bc0194SAndreas Gruenbacher return -EIO; 3236b411b363SPhilipp Reisner } 3237b411b363SPhilipp Reisner 3238b411b363SPhilipp Reisner if (apv <= 88) { 3239e658983aSAndreas Gruenbacher header_size = sizeof(struct p_rs_param); 3240e2857216SAndreas Gruenbacher data_size = pi->size - header_size; 32418e26f9ccSPhilipp Reisner } else if (apv <= 94) { 3242e658983aSAndreas Gruenbacher header_size = sizeof(struct p_rs_param_89); 3243e2857216SAndreas Gruenbacher data_size = pi->size - header_size; 3244b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 32458e26f9ccSPhilipp Reisner } else { 3246e658983aSAndreas Gruenbacher header_size = sizeof(struct p_rs_param_95); 3247e2857216SAndreas Gruenbacher data_size = pi->size - header_size; 3248b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 3249b411b363SPhilipp Reisner } 3250b411b363SPhilipp Reisner 3251b411b363SPhilipp Reisner /* initialize verify_alg and csums_alg */ 3252e658983aSAndreas Gruenbacher p = pi->data; 3253b411b363SPhilipp Reisner memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); 3254b411b363SPhilipp Reisner 3255e658983aSAndreas Gruenbacher err = drbd_recv_all(mdev->tconn, p, header_size); 325682bc0194SAndreas Gruenbacher if (err) 325782bc0194SAndreas Gruenbacher return err; 3258b411b363SPhilipp Reisner 3259813472ceSPhilipp Reisner mutex_lock(&mdev->tconn->conf_update); 3260813472ceSPhilipp Reisner old_net_conf = mdev->tconn->net_conf; 3261813472ceSPhilipp Reisner if (get_ldev(mdev)) { 3262daeda1ccSPhilipp Reisner new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); 3263daeda1ccSPhilipp Reisner if (!new_disk_conf) { 3264813472ceSPhilipp Reisner put_ldev(mdev); 3265813472ceSPhilipp Reisner mutex_unlock(&mdev->tconn->conf_update); 3266daeda1ccSPhilipp Reisner dev_err(DEV, "Allocation of new disk_conf failed\n"); 3267daeda1ccSPhilipp Reisner return -ENOMEM; 3268f399002eSLars Ellenberg } 3269b411b363SPhilipp Reisner 3270daeda1ccSPhilipp Reisner old_disk_conf = mdev->ldev->disk_conf; 3271daeda1ccSPhilipp Reisner *new_disk_conf = *old_disk_conf; 3272daeda1ccSPhilipp Reisner 32736394b935SAndreas Gruenbacher new_disk_conf->resync_rate = be32_to_cpu(p->resync_rate); 3274813472ceSPhilipp Reisner } 3275daeda1ccSPhilipp Reisner 3276b411b363SPhilipp Reisner if (apv >= 88) { 3277b411b363SPhilipp Reisner if (apv == 88) { 3278b411b363SPhilipp Reisner if (data_size > SHARED_SECRET_MAX) { 3279b411b363SPhilipp Reisner dev_err(DEV, "verify-alg too long, " 3280b411b363SPhilipp Reisner "peer wants %u, accepting only %u byte\n", 3281b411b363SPhilipp Reisner data_size, SHARED_SECRET_MAX); 3282813472ceSPhilipp Reisner err = -EIO; 3283813472ceSPhilipp Reisner goto reconnect; 3284b411b363SPhilipp Reisner } 3285b411b363SPhilipp Reisner 328682bc0194SAndreas Gruenbacher err = drbd_recv_all(mdev->tconn, p->verify_alg, data_size); 3287813472ceSPhilipp Reisner if (err) 3288813472ceSPhilipp Reisner goto reconnect; 3289b411b363SPhilipp Reisner /* we expect NUL terminated string */ 3290b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 3291b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[data_size-1] == 0); 3292b411b363SPhilipp Reisner p->verify_alg[data_size-1] = 0; 3293b411b363SPhilipp Reisner 3294b411b363SPhilipp Reisner } else /* apv >= 89 */ { 3295b411b363SPhilipp Reisner /* we still expect NUL terminated strings */ 3296b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 3297b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0); 3298b411b363SPhilipp Reisner D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0); 3299b411b363SPhilipp Reisner p->verify_alg[SHARED_SECRET_MAX-1] = 0; 3300b411b363SPhilipp Reisner p->csums_alg[SHARED_SECRET_MAX-1] = 0; 3301b411b363SPhilipp Reisner } 3302b411b363SPhilipp Reisner 33032ec91e0eSPhilipp Reisner if (strcmp(old_net_conf->verify_alg, p->verify_alg)) { 3304b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 3305b411b363SPhilipp Reisner dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", 33062ec91e0eSPhilipp Reisner old_net_conf->verify_alg, p->verify_alg); 3307b411b363SPhilipp Reisner goto disconnect; 3308b411b363SPhilipp Reisner } 3309b411b363SPhilipp Reisner verify_tfm = drbd_crypto_alloc_digest_safe(mdev, 3310b411b363SPhilipp Reisner p->verify_alg, "verify-alg"); 3311b411b363SPhilipp Reisner if (IS_ERR(verify_tfm)) { 3312b411b363SPhilipp Reisner verify_tfm = NULL; 3313b411b363SPhilipp Reisner goto disconnect; 3314b411b363SPhilipp Reisner } 3315b411b363SPhilipp Reisner } 3316b411b363SPhilipp Reisner 33172ec91e0eSPhilipp Reisner if (apv >= 89 && strcmp(old_net_conf->csums_alg, p->csums_alg)) { 3318b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 3319b411b363SPhilipp Reisner dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", 33202ec91e0eSPhilipp Reisner old_net_conf->csums_alg, p->csums_alg); 3321b411b363SPhilipp Reisner goto disconnect; 3322b411b363SPhilipp Reisner } 3323b411b363SPhilipp Reisner csums_tfm = drbd_crypto_alloc_digest_safe(mdev, 3324b411b363SPhilipp Reisner p->csums_alg, "csums-alg"); 3325b411b363SPhilipp Reisner if (IS_ERR(csums_tfm)) { 3326b411b363SPhilipp Reisner csums_tfm = NULL; 3327b411b363SPhilipp Reisner goto disconnect; 3328b411b363SPhilipp Reisner } 3329b411b363SPhilipp Reisner } 3330b411b363SPhilipp Reisner 3331813472ceSPhilipp Reisner if (apv > 94 && new_disk_conf) { 3332daeda1ccSPhilipp Reisner new_disk_conf->c_plan_ahead = be32_to_cpu(p->c_plan_ahead); 3333daeda1ccSPhilipp Reisner new_disk_conf->c_delay_target = be32_to_cpu(p->c_delay_target); 3334daeda1ccSPhilipp Reisner new_disk_conf->c_fill_target = be32_to_cpu(p->c_fill_target); 3335daeda1ccSPhilipp Reisner new_disk_conf->c_max_rate = be32_to_cpu(p->c_max_rate); 3336778f271dSPhilipp Reisner 3337daeda1ccSPhilipp Reisner fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ; 33389958c857SPhilipp Reisner if (fifo_size != mdev->rs_plan_s->size) { 3339813472ceSPhilipp Reisner new_plan = fifo_alloc(fifo_size); 3340813472ceSPhilipp Reisner if (!new_plan) { 3341778f271dSPhilipp Reisner dev_err(DEV, "kmalloc of fifo_buffer failed"); 3342f399002eSLars Ellenberg put_ldev(mdev); 3343778f271dSPhilipp Reisner goto disconnect; 3344778f271dSPhilipp Reisner } 3345778f271dSPhilipp Reisner } 33468e26f9ccSPhilipp Reisner } 3347b411b363SPhilipp Reisner 334891fd4dadSPhilipp Reisner if (verify_tfm || csums_tfm) { 33492ec91e0eSPhilipp Reisner new_net_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL); 33502ec91e0eSPhilipp Reisner if (!new_net_conf) { 335191fd4dadSPhilipp Reisner dev_err(DEV, "Allocation of new net_conf failed\n"); 335291fd4dadSPhilipp Reisner goto disconnect; 335391fd4dadSPhilipp Reisner } 335491fd4dadSPhilipp Reisner 33552ec91e0eSPhilipp Reisner *new_net_conf = *old_net_conf; 335691fd4dadSPhilipp Reisner 3357b411b363SPhilipp Reisner if (verify_tfm) { 33582ec91e0eSPhilipp Reisner strcpy(new_net_conf->verify_alg, p->verify_alg); 33592ec91e0eSPhilipp Reisner new_net_conf->verify_alg_len = strlen(p->verify_alg) + 1; 3360f399002eSLars Ellenberg crypto_free_hash(mdev->tconn->verify_tfm); 3361f399002eSLars Ellenberg mdev->tconn->verify_tfm = verify_tfm; 3362b411b363SPhilipp Reisner dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg); 3363b411b363SPhilipp Reisner } 3364b411b363SPhilipp Reisner if (csums_tfm) { 33652ec91e0eSPhilipp Reisner strcpy(new_net_conf->csums_alg, p->csums_alg); 33662ec91e0eSPhilipp Reisner new_net_conf->csums_alg_len = strlen(p->csums_alg) + 1; 3367f399002eSLars Ellenberg crypto_free_hash(mdev->tconn->csums_tfm); 3368f399002eSLars Ellenberg mdev->tconn->csums_tfm = csums_tfm; 3369b411b363SPhilipp Reisner dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg); 3370b411b363SPhilipp Reisner } 33712ec91e0eSPhilipp Reisner rcu_assign_pointer(tconn->net_conf, new_net_conf); 337291fd4dadSPhilipp Reisner } 337391fd4dadSPhilipp Reisner } 337491fd4dadSPhilipp Reisner 3375813472ceSPhilipp Reisner if (new_disk_conf) { 3376daeda1ccSPhilipp Reisner rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf); 3377813472ceSPhilipp Reisner put_ldev(mdev); 3378778f271dSPhilipp Reisner } 3379813472ceSPhilipp Reisner 3380813472ceSPhilipp Reisner if (new_plan) { 3381813472ceSPhilipp Reisner old_plan = mdev->rs_plan_s; 3382813472ceSPhilipp Reisner rcu_assign_pointer(mdev->rs_plan_s, new_plan); 3383813472ceSPhilipp Reisner } 3384daeda1ccSPhilipp Reisner 3385daeda1ccSPhilipp Reisner mutex_unlock(&mdev->tconn->conf_update); 3386daeda1ccSPhilipp Reisner synchronize_rcu(); 3387daeda1ccSPhilipp Reisner if (new_net_conf) 3388daeda1ccSPhilipp Reisner kfree(old_net_conf); 3389daeda1ccSPhilipp Reisner kfree(old_disk_conf); 3390813472ceSPhilipp Reisner kfree(old_plan); 3391daeda1ccSPhilipp Reisner 339282bc0194SAndreas Gruenbacher return 0; 3393b411b363SPhilipp Reisner 3394813472ceSPhilipp Reisner reconnect: 3395813472ceSPhilipp Reisner if (new_disk_conf) { 3396813472ceSPhilipp Reisner put_ldev(mdev); 3397813472ceSPhilipp Reisner kfree(new_disk_conf); 3398813472ceSPhilipp Reisner } 3399813472ceSPhilipp Reisner mutex_unlock(&mdev->tconn->conf_update); 3400813472ceSPhilipp Reisner return -EIO; 3401813472ceSPhilipp Reisner 3402b411b363SPhilipp Reisner disconnect: 3403813472ceSPhilipp Reisner kfree(new_plan); 3404813472ceSPhilipp Reisner if (new_disk_conf) { 3405813472ceSPhilipp Reisner put_ldev(mdev); 3406813472ceSPhilipp Reisner kfree(new_disk_conf); 3407813472ceSPhilipp Reisner } 3408a0095508SPhilipp Reisner mutex_unlock(&mdev->tconn->conf_update); 3409b411b363SPhilipp Reisner /* just for completeness: actually not needed, 3410b411b363SPhilipp Reisner * as this is not reached if csums_tfm was ok. */ 3411b411b363SPhilipp Reisner crypto_free_hash(csums_tfm); 3412b411b363SPhilipp Reisner /* but free the verify_tfm again, if csums_tfm did not work out */ 3413b411b363SPhilipp Reisner crypto_free_hash(verify_tfm); 341438fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 341582bc0194SAndreas Gruenbacher return -EIO; 3416b411b363SPhilipp Reisner } 3417b411b363SPhilipp Reisner 3418b411b363SPhilipp Reisner /* warn if the arguments differ by more than 12.5% */ 3419b411b363SPhilipp Reisner static void warn_if_differ_considerably(struct drbd_conf *mdev, 3420b411b363SPhilipp Reisner const char *s, sector_t a, sector_t b) 3421b411b363SPhilipp Reisner { 3422b411b363SPhilipp Reisner sector_t d; 3423b411b363SPhilipp Reisner if (a == 0 || b == 0) 3424b411b363SPhilipp Reisner return; 3425b411b363SPhilipp Reisner d = (a > b) ? (a - b) : (b - a); 3426b411b363SPhilipp Reisner if (d > (a>>3) || d > (b>>3)) 3427b411b363SPhilipp Reisner dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s, 3428b411b363SPhilipp Reisner (unsigned long long)a, (unsigned long long)b); 3429b411b363SPhilipp Reisner } 3430b411b363SPhilipp Reisner 34314a76b161SAndreas Gruenbacher static int receive_sizes(struct drbd_tconn *tconn, struct packet_info *pi) 3432b411b363SPhilipp Reisner { 34334a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3434e658983aSAndreas Gruenbacher struct p_sizes *p = pi->data; 3435b411b363SPhilipp Reisner enum determine_dev_size dd = unchanged; 3436b411b363SPhilipp Reisner sector_t p_size, p_usize, my_usize; 3437b411b363SPhilipp Reisner int ldsc = 0; /* local disk size changed */ 3438e89b591cSPhilipp Reisner enum dds_flags ddsf; 3439b411b363SPhilipp Reisner 34404a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 34414a76b161SAndreas Gruenbacher if (!mdev) 34424a76b161SAndreas Gruenbacher return config_unknown_volume(tconn, pi); 34434a76b161SAndreas Gruenbacher 3444b411b363SPhilipp Reisner p_size = be64_to_cpu(p->d_size); 3445b411b363SPhilipp Reisner p_usize = be64_to_cpu(p->u_size); 3446b411b363SPhilipp Reisner 3447b411b363SPhilipp Reisner /* just store the peer's disk size for now. 3448b411b363SPhilipp Reisner * we still need to figure out whether we accept that. */ 3449b411b363SPhilipp Reisner mdev->p_size = p_size; 3450b411b363SPhilipp Reisner 3451b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3452daeda1ccSPhilipp Reisner rcu_read_lock(); 3453daeda1ccSPhilipp Reisner my_usize = rcu_dereference(mdev->ldev->disk_conf)->disk_size; 3454daeda1ccSPhilipp Reisner rcu_read_unlock(); 3455daeda1ccSPhilipp Reisner 3456b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "lower level device sizes", 3457b411b363SPhilipp Reisner p_size, drbd_get_max_capacity(mdev->ldev)); 3458b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "user requested size", 3459daeda1ccSPhilipp Reisner p_usize, my_usize); 3460b411b363SPhilipp Reisner 3461b411b363SPhilipp Reisner /* if this is the first connect, or an otherwise expected 3462b411b363SPhilipp Reisner * param exchange, choose the minimum */ 3463b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) 3464daeda1ccSPhilipp Reisner p_usize = min_not_zero(my_usize, p_usize); 3465b411b363SPhilipp Reisner 3466b411b363SPhilipp Reisner /* Never shrink a device with usable data during connect. 3467b411b363SPhilipp Reisner But allow online shrinking if we are connected. */ 3468ef5e44a6SPhilipp Reisner if (drbd_new_dev_size(mdev, mdev->ldev, p_usize, 0) < 3469b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) && 3470b411b363SPhilipp Reisner mdev->state.disk >= D_OUTDATED && 3471b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED) { 3472b411b363SPhilipp Reisner dev_err(DEV, "The peer's disk size is too small!\n"); 347338fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 3474b411b363SPhilipp Reisner put_ldev(mdev); 347582bc0194SAndreas Gruenbacher return -EIO; 3476b411b363SPhilipp Reisner } 3477daeda1ccSPhilipp Reisner 3478daeda1ccSPhilipp Reisner if (my_usize != p_usize) { 3479daeda1ccSPhilipp Reisner struct disk_conf *old_disk_conf, *new_disk_conf = NULL; 3480daeda1ccSPhilipp Reisner 3481daeda1ccSPhilipp Reisner new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); 3482daeda1ccSPhilipp Reisner if (!new_disk_conf) { 3483daeda1ccSPhilipp Reisner dev_err(DEV, "Allocation of new disk_conf failed\n"); 3484daeda1ccSPhilipp Reisner put_ldev(mdev); 3485daeda1ccSPhilipp Reisner return -ENOMEM; 3486daeda1ccSPhilipp Reisner } 3487daeda1ccSPhilipp Reisner 3488daeda1ccSPhilipp Reisner mutex_lock(&mdev->tconn->conf_update); 3489daeda1ccSPhilipp Reisner old_disk_conf = mdev->ldev->disk_conf; 3490daeda1ccSPhilipp Reisner *new_disk_conf = *old_disk_conf; 3491daeda1ccSPhilipp Reisner new_disk_conf->disk_size = p_usize; 3492daeda1ccSPhilipp Reisner 3493daeda1ccSPhilipp Reisner rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf); 3494daeda1ccSPhilipp Reisner mutex_unlock(&mdev->tconn->conf_update); 3495daeda1ccSPhilipp Reisner synchronize_rcu(); 3496daeda1ccSPhilipp Reisner kfree(old_disk_conf); 3497daeda1ccSPhilipp Reisner 3498daeda1ccSPhilipp Reisner dev_info(DEV, "Peer sets u_size to %lu sectors\n", 3499daeda1ccSPhilipp Reisner (unsigned long)my_usize); 3500daeda1ccSPhilipp Reisner } 3501daeda1ccSPhilipp Reisner 3502b411b363SPhilipp Reisner put_ldev(mdev); 3503b411b363SPhilipp Reisner } 3504b411b363SPhilipp Reisner 3505e89b591cSPhilipp Reisner ddsf = be16_to_cpu(p->dds_flags); 3506b411b363SPhilipp Reisner if (get_ldev(mdev)) { 350724c4830cSBart Van Assche dd = drbd_determine_dev_size(mdev, ddsf); 3508b411b363SPhilipp Reisner put_ldev(mdev); 3509b411b363SPhilipp Reisner if (dd == dev_size_error) 351082bc0194SAndreas Gruenbacher return -EIO; 3511b411b363SPhilipp Reisner drbd_md_sync(mdev); 3512b411b363SPhilipp Reisner } else { 3513b411b363SPhilipp Reisner /* I am diskless, need to accept the peer's size. */ 3514b411b363SPhilipp Reisner drbd_set_my_capacity(mdev, p_size); 3515b411b363SPhilipp Reisner } 3516b411b363SPhilipp Reisner 351799432fccSPhilipp Reisner mdev->peer_max_bio_size = be32_to_cpu(p->max_bio_size); 351899432fccSPhilipp Reisner drbd_reconsider_max_bio_size(mdev); 351999432fccSPhilipp Reisner 3520b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3521b411b363SPhilipp Reisner if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { 3522b411b363SPhilipp Reisner mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); 3523b411b363SPhilipp Reisner ldsc = 1; 3524b411b363SPhilipp Reisner } 3525b411b363SPhilipp Reisner 3526b411b363SPhilipp Reisner put_ldev(mdev); 3527b411b363SPhilipp Reisner } 3528b411b363SPhilipp Reisner 3529b411b363SPhilipp Reisner if (mdev->state.conn > C_WF_REPORT_PARAMS) { 3530b411b363SPhilipp Reisner if (be64_to_cpu(p->c_size) != 3531b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) || ldsc) { 3532b411b363SPhilipp Reisner /* we have different sizes, probably peer 3533b411b363SPhilipp Reisner * needs to know my new size... */ 3534e89b591cSPhilipp Reisner drbd_send_sizes(mdev, 0, ddsf); 3535b411b363SPhilipp Reisner } 3536b411b363SPhilipp Reisner if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) || 3537b411b363SPhilipp Reisner (dd == grew && mdev->state.conn == C_CONNECTED)) { 3538b411b363SPhilipp Reisner if (mdev->state.pdsk >= D_INCONSISTENT && 3539e89b591cSPhilipp Reisner mdev->state.disk >= D_INCONSISTENT) { 3540e89b591cSPhilipp Reisner if (ddsf & DDSF_NO_RESYNC) 3541e89b591cSPhilipp Reisner dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n"); 3542b411b363SPhilipp Reisner else 3543e89b591cSPhilipp Reisner resync_after_online_grow(mdev); 3544e89b591cSPhilipp Reisner } else 3545b411b363SPhilipp Reisner set_bit(RESYNC_AFTER_NEG, &mdev->flags); 3546b411b363SPhilipp Reisner } 3547b411b363SPhilipp Reisner } 3548b411b363SPhilipp Reisner 354982bc0194SAndreas Gruenbacher return 0; 3550b411b363SPhilipp Reisner } 3551b411b363SPhilipp Reisner 35524a76b161SAndreas Gruenbacher static int receive_uuids(struct drbd_tconn *tconn, struct packet_info *pi) 3553b411b363SPhilipp Reisner { 35544a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3555e658983aSAndreas Gruenbacher struct p_uuids *p = pi->data; 3556b411b363SPhilipp Reisner u64 *p_uuid; 355762b0da3aSLars Ellenberg int i, updated_uuids = 0; 3558b411b363SPhilipp Reisner 35594a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 35604a76b161SAndreas Gruenbacher if (!mdev) 35614a76b161SAndreas Gruenbacher return config_unknown_volume(tconn, pi); 35624a76b161SAndreas Gruenbacher 3563b411b363SPhilipp Reisner p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); 3564b411b363SPhilipp Reisner 3565b411b363SPhilipp Reisner for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) 3566b411b363SPhilipp Reisner p_uuid[i] = be64_to_cpu(p->uuid[i]); 3567b411b363SPhilipp Reisner 3568b411b363SPhilipp Reisner kfree(mdev->p_uuid); 3569b411b363SPhilipp Reisner mdev->p_uuid = p_uuid; 3570b411b363SPhilipp Reisner 3571b411b363SPhilipp Reisner if (mdev->state.conn < C_CONNECTED && 3572b411b363SPhilipp Reisner mdev->state.disk < D_INCONSISTENT && 3573b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && 3574b411b363SPhilipp Reisner (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { 3575b411b363SPhilipp Reisner dev_err(DEV, "Can only connect to data with current UUID=%016llX\n", 3576b411b363SPhilipp Reisner (unsigned long long)mdev->ed_uuid); 357738fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 357882bc0194SAndreas Gruenbacher return -EIO; 3579b411b363SPhilipp Reisner } 3580b411b363SPhilipp Reisner 3581b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3582b411b363SPhilipp Reisner int skip_initial_sync = 3583b411b363SPhilipp Reisner mdev->state.conn == C_CONNECTED && 358431890f4aSPhilipp Reisner mdev->tconn->agreed_pro_version >= 90 && 3585b411b363SPhilipp Reisner mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && 3586b411b363SPhilipp Reisner (p_uuid[UI_FLAGS] & 8); 3587b411b363SPhilipp Reisner if (skip_initial_sync) { 3588b411b363SPhilipp Reisner dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n"); 3589b411b363SPhilipp Reisner drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, 359020ceb2b2SLars Ellenberg "clear_n_write from receive_uuids", 359120ceb2b2SLars Ellenberg BM_LOCKED_TEST_ALLOWED); 3592b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]); 3593b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0); 3594b411b363SPhilipp Reisner _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), 3595b411b363SPhilipp Reisner CS_VERBOSE, NULL); 3596b411b363SPhilipp Reisner drbd_md_sync(mdev); 359762b0da3aSLars Ellenberg updated_uuids = 1; 3598b411b363SPhilipp Reisner } 3599b411b363SPhilipp Reisner put_ldev(mdev); 360018a50fa2SPhilipp Reisner } else if (mdev->state.disk < D_INCONSISTENT && 360118a50fa2SPhilipp Reisner mdev->state.role == R_PRIMARY) { 360218a50fa2SPhilipp Reisner /* I am a diskless primary, the peer just created a new current UUID 360318a50fa2SPhilipp Reisner for me. */ 360462b0da3aSLars Ellenberg updated_uuids = drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 3605b411b363SPhilipp Reisner } 3606b411b363SPhilipp Reisner 3607b411b363SPhilipp Reisner /* Before we test for the disk state, we should wait until an eventually 3608b411b363SPhilipp Reisner ongoing cluster wide state change is finished. That is important if 3609b411b363SPhilipp Reisner we are primary and are detaching from our disk. We need to see the 3610b411b363SPhilipp Reisner new disk state... */ 36118410da8fSPhilipp Reisner mutex_lock(mdev->state_mutex); 36128410da8fSPhilipp Reisner mutex_unlock(mdev->state_mutex); 3613b411b363SPhilipp Reisner if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT) 361462b0da3aSLars Ellenberg updated_uuids |= drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 361562b0da3aSLars Ellenberg 361662b0da3aSLars Ellenberg if (updated_uuids) 361762b0da3aSLars Ellenberg drbd_print_uuids(mdev, "receiver updated UUIDs to"); 3618b411b363SPhilipp Reisner 361982bc0194SAndreas Gruenbacher return 0; 3620b411b363SPhilipp Reisner } 3621b411b363SPhilipp Reisner 3622b411b363SPhilipp Reisner /** 3623b411b363SPhilipp Reisner * convert_state() - Converts the peer's view of the cluster state to our point of view 3624b411b363SPhilipp Reisner * @ps: The state as seen by the peer. 3625b411b363SPhilipp Reisner */ 3626b411b363SPhilipp Reisner static union drbd_state convert_state(union drbd_state ps) 3627b411b363SPhilipp Reisner { 3628b411b363SPhilipp Reisner union drbd_state ms; 3629b411b363SPhilipp Reisner 3630b411b363SPhilipp Reisner static enum drbd_conns c_tab[] = { 3631b411b363SPhilipp Reisner [C_CONNECTED] = C_CONNECTED, 3632b411b363SPhilipp Reisner 3633b411b363SPhilipp Reisner [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, 3634b411b363SPhilipp Reisner [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, 3635b411b363SPhilipp Reisner [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ 3636b411b363SPhilipp Reisner [C_VERIFY_S] = C_VERIFY_T, 3637b411b363SPhilipp Reisner [C_MASK] = C_MASK, 3638b411b363SPhilipp Reisner }; 3639b411b363SPhilipp Reisner 3640b411b363SPhilipp Reisner ms.i = ps.i; 3641b411b363SPhilipp Reisner 3642b411b363SPhilipp Reisner ms.conn = c_tab[ps.conn]; 3643b411b363SPhilipp Reisner ms.peer = ps.role; 3644b411b363SPhilipp Reisner ms.role = ps.peer; 3645b411b363SPhilipp Reisner ms.pdsk = ps.disk; 3646b411b363SPhilipp Reisner ms.disk = ps.pdsk; 3647b411b363SPhilipp Reisner ms.peer_isp = (ps.aftr_isp | ps.user_isp); 3648b411b363SPhilipp Reisner 3649b411b363SPhilipp Reisner return ms; 3650b411b363SPhilipp Reisner } 3651b411b363SPhilipp Reisner 36524a76b161SAndreas Gruenbacher static int receive_req_state(struct drbd_tconn *tconn, struct packet_info *pi) 3653b411b363SPhilipp Reisner { 36544a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3655e658983aSAndreas Gruenbacher struct p_req_state *p = pi->data; 3656b411b363SPhilipp Reisner union drbd_state mask, val; 3657bf885f8aSAndreas Gruenbacher enum drbd_state_rv rv; 3658b411b363SPhilipp Reisner 36594a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 36604a76b161SAndreas Gruenbacher if (!mdev) 36614a76b161SAndreas Gruenbacher return -EIO; 36624a76b161SAndreas Gruenbacher 3663b411b363SPhilipp Reisner mask.i = be32_to_cpu(p->mask); 3664b411b363SPhilipp Reisner val.i = be32_to_cpu(p->val); 3665b411b363SPhilipp Reisner 366625703f83SPhilipp Reisner if (test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) && 36678410da8fSPhilipp Reisner mutex_is_locked(mdev->state_mutex)) { 3668b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG); 366982bc0194SAndreas Gruenbacher return 0; 3670b411b363SPhilipp Reisner } 3671b411b363SPhilipp Reisner 3672b411b363SPhilipp Reisner mask = convert_state(mask); 3673b411b363SPhilipp Reisner val = convert_state(val); 3674b411b363SPhilipp Reisner 3675b411b363SPhilipp Reisner rv = drbd_change_state(mdev, CS_VERBOSE, mask, val); 3676b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, rv); 3677047cd4a6SPhilipp Reisner 3678b411b363SPhilipp Reisner drbd_md_sync(mdev); 3679b411b363SPhilipp Reisner 368082bc0194SAndreas Gruenbacher return 0; 3681b411b363SPhilipp Reisner } 3682b411b363SPhilipp Reisner 3683e2857216SAndreas Gruenbacher static int receive_req_conn_state(struct drbd_tconn *tconn, struct packet_info *pi) 3684dfafcc8aSPhilipp Reisner { 3685e658983aSAndreas Gruenbacher struct p_req_state *p = pi->data; 3686dfafcc8aSPhilipp Reisner union drbd_state mask, val; 3687dfafcc8aSPhilipp Reisner enum drbd_state_rv rv; 3688dfafcc8aSPhilipp Reisner 3689dfafcc8aSPhilipp Reisner mask.i = be32_to_cpu(p->mask); 3690dfafcc8aSPhilipp Reisner val.i = be32_to_cpu(p->val); 3691dfafcc8aSPhilipp Reisner 3692dfafcc8aSPhilipp Reisner if (test_bit(DISCARD_CONCURRENT, &tconn->flags) && 3693dfafcc8aSPhilipp Reisner mutex_is_locked(&tconn->cstate_mutex)) { 3694dfafcc8aSPhilipp Reisner conn_send_sr_reply(tconn, SS_CONCURRENT_ST_CHG); 369582bc0194SAndreas Gruenbacher return 0; 3696dfafcc8aSPhilipp Reisner } 3697dfafcc8aSPhilipp Reisner 3698dfafcc8aSPhilipp Reisner mask = convert_state(mask); 3699dfafcc8aSPhilipp Reisner val = convert_state(val); 3700dfafcc8aSPhilipp Reisner 3701778bcf2eSPhilipp Reisner rv = conn_request_state(tconn, mask, val, CS_VERBOSE | CS_LOCAL_ONLY | CS_IGN_OUTD_FAIL); 3702dfafcc8aSPhilipp Reisner conn_send_sr_reply(tconn, rv); 3703dfafcc8aSPhilipp Reisner 370482bc0194SAndreas Gruenbacher return 0; 3705dfafcc8aSPhilipp Reisner } 3706dfafcc8aSPhilipp Reisner 37074a76b161SAndreas Gruenbacher static int receive_state(struct drbd_tconn *tconn, struct packet_info *pi) 3708b411b363SPhilipp Reisner { 37094a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3710e658983aSAndreas Gruenbacher struct p_state *p = pi->data; 37114ac4aadaSLars Ellenberg union drbd_state os, ns, peer_state; 3712b411b363SPhilipp Reisner enum drbd_disk_state real_peer_disk; 371365d922c3SPhilipp Reisner enum chg_state_flags cs_flags; 3714b411b363SPhilipp Reisner int rv; 3715b411b363SPhilipp Reisner 37164a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 37174a76b161SAndreas Gruenbacher if (!mdev) 37184a76b161SAndreas Gruenbacher return config_unknown_volume(tconn, pi); 37194a76b161SAndreas Gruenbacher 3720b411b363SPhilipp Reisner peer_state.i = be32_to_cpu(p->state); 3721b411b363SPhilipp Reisner 3722b411b363SPhilipp Reisner real_peer_disk = peer_state.disk; 3723b411b363SPhilipp Reisner if (peer_state.disk == D_NEGOTIATING) { 3724b411b363SPhilipp Reisner real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; 3725b411b363SPhilipp Reisner dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); 3726b411b363SPhilipp Reisner } 3727b411b363SPhilipp Reisner 372887eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 3729b411b363SPhilipp Reisner retry: 373078bae59bSPhilipp Reisner os = ns = drbd_read_state(mdev); 373187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3732b411b363SPhilipp Reisner 3733e9ef7bb6SLars Ellenberg /* peer says his disk is uptodate, while we think it is inconsistent, 3734e9ef7bb6SLars Ellenberg * and this happens while we think we have a sync going on. */ 3735e9ef7bb6SLars Ellenberg if (os.pdsk == D_INCONSISTENT && real_peer_disk == D_UP_TO_DATE && 3736e9ef7bb6SLars Ellenberg os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { 3737e9ef7bb6SLars Ellenberg /* If we are (becoming) SyncSource, but peer is still in sync 3738e9ef7bb6SLars Ellenberg * preparation, ignore its uptodate-ness to avoid flapping, it 3739e9ef7bb6SLars Ellenberg * will change to inconsistent once the peer reaches active 3740e9ef7bb6SLars Ellenberg * syncing states. 3741e9ef7bb6SLars Ellenberg * It may have changed syncer-paused flags, however, so we 3742e9ef7bb6SLars Ellenberg * cannot ignore this completely. */ 3743e9ef7bb6SLars Ellenberg if (peer_state.conn > C_CONNECTED && 3744e9ef7bb6SLars Ellenberg peer_state.conn < C_SYNC_SOURCE) 3745e9ef7bb6SLars Ellenberg real_peer_disk = D_INCONSISTENT; 3746e9ef7bb6SLars Ellenberg 3747e9ef7bb6SLars Ellenberg /* if peer_state changes to connected at the same time, 3748e9ef7bb6SLars Ellenberg * it explicitly notifies us that it finished resync. 3749e9ef7bb6SLars Ellenberg * Maybe we should finish it up, too? */ 3750e9ef7bb6SLars Ellenberg else if (os.conn >= C_SYNC_SOURCE && 3751e9ef7bb6SLars Ellenberg peer_state.conn == C_CONNECTED) { 3752e9ef7bb6SLars Ellenberg if (drbd_bm_total_weight(mdev) <= mdev->rs_failed) 3753e9ef7bb6SLars Ellenberg drbd_resync_finished(mdev); 375482bc0194SAndreas Gruenbacher return 0; 3755e9ef7bb6SLars Ellenberg } 3756e9ef7bb6SLars Ellenberg } 3757e9ef7bb6SLars Ellenberg 3758e9ef7bb6SLars Ellenberg /* peer says his disk is inconsistent, while we think it is uptodate, 3759e9ef7bb6SLars Ellenberg * and this happens while the peer still thinks we have a sync going on, 3760e9ef7bb6SLars Ellenberg * but we think we are already done with the sync. 3761e9ef7bb6SLars Ellenberg * We ignore this to avoid flapping pdsk. 3762e9ef7bb6SLars Ellenberg * This should not happen, if the peer is a recent version of drbd. */ 3763e9ef7bb6SLars Ellenberg if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && 3764e9ef7bb6SLars Ellenberg os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) 3765e9ef7bb6SLars Ellenberg real_peer_disk = D_UP_TO_DATE; 3766e9ef7bb6SLars Ellenberg 37674ac4aadaSLars Ellenberg if (ns.conn == C_WF_REPORT_PARAMS) 37684ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3769b411b363SPhilipp Reisner 377067531718SPhilipp Reisner if (peer_state.conn == C_AHEAD) 377167531718SPhilipp Reisner ns.conn = C_BEHIND; 377267531718SPhilipp Reisner 3773b411b363SPhilipp Reisner if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING && 3774b411b363SPhilipp Reisner get_ldev_if_state(mdev, D_NEGOTIATING)) { 3775b411b363SPhilipp Reisner int cr; /* consider resync */ 3776b411b363SPhilipp Reisner 3777b411b363SPhilipp Reisner /* if we established a new connection */ 37784ac4aadaSLars Ellenberg cr = (os.conn < C_CONNECTED); 3779b411b363SPhilipp Reisner /* if we had an established connection 3780b411b363SPhilipp Reisner * and one of the nodes newly attaches a disk */ 37814ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3782b411b363SPhilipp Reisner (peer_state.disk == D_NEGOTIATING || 37834ac4aadaSLars Ellenberg os.disk == D_NEGOTIATING)); 3784b411b363SPhilipp Reisner /* if we have both been inconsistent, and the peer has been 3785b411b363SPhilipp Reisner * forced to be UpToDate with --overwrite-data */ 3786b411b363SPhilipp Reisner cr |= test_bit(CONSIDER_RESYNC, &mdev->flags); 3787b411b363SPhilipp Reisner /* if we had been plain connected, and the admin requested to 3788b411b363SPhilipp Reisner * start a sync by "invalidate" or "invalidate-remote" */ 37894ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3790b411b363SPhilipp Reisner (peer_state.conn >= C_STARTING_SYNC_S && 3791b411b363SPhilipp Reisner peer_state.conn <= C_WF_BITMAP_T)); 3792b411b363SPhilipp Reisner 3793b411b363SPhilipp Reisner if (cr) 37944ac4aadaSLars Ellenberg ns.conn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk); 3795b411b363SPhilipp Reisner 3796b411b363SPhilipp Reisner put_ldev(mdev); 37974ac4aadaSLars Ellenberg if (ns.conn == C_MASK) { 37984ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3799b411b363SPhilipp Reisner if (mdev->state.disk == D_NEGOTIATING) { 380082f59cc6SLars Ellenberg drbd_force_state(mdev, NS(disk, D_FAILED)); 3801b411b363SPhilipp Reisner } else if (peer_state.disk == D_NEGOTIATING) { 3802b411b363SPhilipp Reisner dev_err(DEV, "Disk attach process on the peer node was aborted.\n"); 3803b411b363SPhilipp Reisner peer_state.disk = D_DISKLESS; 3804580b9767SLars Ellenberg real_peer_disk = D_DISKLESS; 3805b411b363SPhilipp Reisner } else { 38068169e41bSPhilipp Reisner if (test_and_clear_bit(CONN_DRY_RUN, &mdev->tconn->flags)) 380782bc0194SAndreas Gruenbacher return -EIO; 38084ac4aadaSLars Ellenberg D_ASSERT(os.conn == C_WF_REPORT_PARAMS); 380938fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 381082bc0194SAndreas Gruenbacher return -EIO; 3811b411b363SPhilipp Reisner } 3812b411b363SPhilipp Reisner } 3813b411b363SPhilipp Reisner } 3814b411b363SPhilipp Reisner 381587eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 381678bae59bSPhilipp Reisner if (os.i != drbd_read_state(mdev).i) 3817b411b363SPhilipp Reisner goto retry; 3818b411b363SPhilipp Reisner clear_bit(CONSIDER_RESYNC, &mdev->flags); 3819b411b363SPhilipp Reisner ns.peer = peer_state.role; 3820b411b363SPhilipp Reisner ns.pdsk = real_peer_disk; 3821b411b363SPhilipp Reisner ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); 38224ac4aadaSLars Ellenberg if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) 3823b411b363SPhilipp Reisner ns.disk = mdev->new_state_tmp.disk; 38244ac4aadaSLars Ellenberg cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); 38252aebfabbSPhilipp Reisner if (ns.pdsk == D_CONSISTENT && drbd_suspended(mdev) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && 3826481c6f50SPhilipp Reisner test_bit(NEW_CUR_UUID, &mdev->flags)) { 38278554df1cSAndreas Gruenbacher /* Do not allow tl_restart(RESEND) for a rebooted peer. We can only allow this 3828481c6f50SPhilipp Reisner for temporal network outages! */ 382987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3830481c6f50SPhilipp Reisner dev_err(DEV, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); 38312f5cdd0bSPhilipp Reisner tl_clear(mdev->tconn); 3832481c6f50SPhilipp Reisner drbd_uuid_new_current(mdev); 3833481c6f50SPhilipp Reisner clear_bit(NEW_CUR_UUID, &mdev->flags); 383438fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS2(conn, C_PROTOCOL_ERROR, susp, 0), CS_HARD); 383582bc0194SAndreas Gruenbacher return -EIO; 3836481c6f50SPhilipp Reisner } 383765d922c3SPhilipp Reisner rv = _drbd_set_state(mdev, ns, cs_flags, NULL); 383878bae59bSPhilipp Reisner ns = drbd_read_state(mdev); 383987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3840b411b363SPhilipp Reisner 3841b411b363SPhilipp Reisner if (rv < SS_SUCCESS) { 384238fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 384382bc0194SAndreas Gruenbacher return -EIO; 3844b411b363SPhilipp Reisner } 3845b411b363SPhilipp Reisner 38464ac4aadaSLars Ellenberg if (os.conn > C_WF_REPORT_PARAMS) { 38474ac4aadaSLars Ellenberg if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED && 3848b411b363SPhilipp Reisner peer_state.disk != D_NEGOTIATING ) { 3849b411b363SPhilipp Reisner /* we want resync, peer has not yet decided to sync... */ 3850b411b363SPhilipp Reisner /* Nowadays only used when forcing a node into primary role and 3851b411b363SPhilipp Reisner setting its disk to UpToDate with that */ 3852b411b363SPhilipp Reisner drbd_send_uuids(mdev); 3853b411b363SPhilipp Reisner drbd_send_state(mdev); 3854b411b363SPhilipp Reisner } 3855b411b363SPhilipp Reisner } 3856b411b363SPhilipp Reisner 3857a0095508SPhilipp Reisner mutex_lock(&mdev->tconn->conf_update); 38586139f60dSAndreas Gruenbacher mdev->tconn->net_conf->discard_my_data = 0; /* without copy; single bit op is atomic */ 3859a0095508SPhilipp Reisner mutex_unlock(&mdev->tconn->conf_update); 3860b411b363SPhilipp Reisner 3861b411b363SPhilipp Reisner drbd_md_sync(mdev); /* update connected indicator, la_size, ... */ 3862b411b363SPhilipp Reisner 386382bc0194SAndreas Gruenbacher return 0; 3864b411b363SPhilipp Reisner } 3865b411b363SPhilipp Reisner 38664a76b161SAndreas Gruenbacher static int receive_sync_uuid(struct drbd_tconn *tconn, struct packet_info *pi) 3867b411b363SPhilipp Reisner { 38684a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 3869e658983aSAndreas Gruenbacher struct p_rs_uuid *p = pi->data; 38704a76b161SAndreas Gruenbacher 38714a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 38724a76b161SAndreas Gruenbacher if (!mdev) 38734a76b161SAndreas Gruenbacher return -EIO; 3874b411b363SPhilipp Reisner 3875b411b363SPhilipp Reisner wait_event(mdev->misc_wait, 3876b411b363SPhilipp Reisner mdev->state.conn == C_WF_SYNC_UUID || 3877c4752ef1SPhilipp Reisner mdev->state.conn == C_BEHIND || 3878b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED || 3879b411b363SPhilipp Reisner mdev->state.disk < D_NEGOTIATING); 3880b411b363SPhilipp Reisner 3881b411b363SPhilipp Reisner /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */ 3882b411b363SPhilipp Reisner 3883b411b363SPhilipp Reisner /* Here the _drbd_uuid_ functions are right, current should 3884b411b363SPhilipp Reisner _not_ be rotated into the history */ 3885b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_NEGOTIATING)) { 3886b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid)); 3887b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0UL); 3888b411b363SPhilipp Reisner 388962b0da3aSLars Ellenberg drbd_print_uuids(mdev, "updated sync uuid"); 3890b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_TARGET); 3891b411b363SPhilipp Reisner 3892b411b363SPhilipp Reisner put_ldev(mdev); 3893b411b363SPhilipp Reisner } else 3894b411b363SPhilipp Reisner dev_err(DEV, "Ignoring SyncUUID packet!\n"); 3895b411b363SPhilipp Reisner 389682bc0194SAndreas Gruenbacher return 0; 3897b411b363SPhilipp Reisner } 3898b411b363SPhilipp Reisner 38992c46407dSAndreas Gruenbacher /** 39002c46407dSAndreas Gruenbacher * receive_bitmap_plain 39012c46407dSAndreas Gruenbacher * 39022c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 39032c46407dSAndreas Gruenbacher * code upon failure. 39042c46407dSAndreas Gruenbacher */ 39052c46407dSAndreas Gruenbacher static int 390650d0b1adSAndreas Gruenbacher receive_bitmap_plain(struct drbd_conf *mdev, unsigned int size, 3907e658983aSAndreas Gruenbacher unsigned long *p, struct bm_xfer_ctx *c) 3908b411b363SPhilipp Reisner { 390950d0b1adSAndreas Gruenbacher unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - 391050d0b1adSAndreas Gruenbacher drbd_header_size(mdev->tconn); 3911e658983aSAndreas Gruenbacher unsigned int num_words = min_t(size_t, data_size / sizeof(*p), 391250d0b1adSAndreas Gruenbacher c->bm_words - c->word_offset); 3913e658983aSAndreas Gruenbacher unsigned int want = num_words * sizeof(*p); 39142c46407dSAndreas Gruenbacher int err; 3915b411b363SPhilipp Reisner 391650d0b1adSAndreas Gruenbacher if (want != size) { 391750d0b1adSAndreas Gruenbacher dev_err(DEV, "%s:want (%u) != size (%u)\n", __func__, want, size); 39182c46407dSAndreas Gruenbacher return -EIO; 3919b411b363SPhilipp Reisner } 3920b411b363SPhilipp Reisner if (want == 0) 39212c46407dSAndreas Gruenbacher return 0; 3922e658983aSAndreas Gruenbacher err = drbd_recv_all(mdev->tconn, p, want); 392382bc0194SAndreas Gruenbacher if (err) 39242c46407dSAndreas Gruenbacher return err; 3925b411b363SPhilipp Reisner 3926e658983aSAndreas Gruenbacher drbd_bm_merge_lel(mdev, c->word_offset, num_words, p); 3927b411b363SPhilipp Reisner 3928b411b363SPhilipp Reisner c->word_offset += num_words; 3929b411b363SPhilipp Reisner c->bit_offset = c->word_offset * BITS_PER_LONG; 3930b411b363SPhilipp Reisner if (c->bit_offset > c->bm_bits) 3931b411b363SPhilipp Reisner c->bit_offset = c->bm_bits; 3932b411b363SPhilipp Reisner 39332c46407dSAndreas Gruenbacher return 1; 3934b411b363SPhilipp Reisner } 3935b411b363SPhilipp Reisner 3936a02d1240SAndreas Gruenbacher static enum drbd_bitmap_code dcbp_get_code(struct p_compressed_bm *p) 3937a02d1240SAndreas Gruenbacher { 3938a02d1240SAndreas Gruenbacher return (enum drbd_bitmap_code)(p->encoding & 0x0f); 3939a02d1240SAndreas Gruenbacher } 3940a02d1240SAndreas Gruenbacher 3941a02d1240SAndreas Gruenbacher static int dcbp_get_start(struct p_compressed_bm *p) 3942a02d1240SAndreas Gruenbacher { 3943a02d1240SAndreas Gruenbacher return (p->encoding & 0x80) != 0; 3944a02d1240SAndreas Gruenbacher } 3945a02d1240SAndreas Gruenbacher 3946a02d1240SAndreas Gruenbacher static int dcbp_get_pad_bits(struct p_compressed_bm *p) 3947a02d1240SAndreas Gruenbacher { 3948a02d1240SAndreas Gruenbacher return (p->encoding >> 4) & 0x7; 3949a02d1240SAndreas Gruenbacher } 3950a02d1240SAndreas Gruenbacher 39512c46407dSAndreas Gruenbacher /** 39522c46407dSAndreas Gruenbacher * recv_bm_rle_bits 39532c46407dSAndreas Gruenbacher * 39542c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 39552c46407dSAndreas Gruenbacher * code upon failure. 39562c46407dSAndreas Gruenbacher */ 39572c46407dSAndreas Gruenbacher static int 3958b411b363SPhilipp Reisner recv_bm_rle_bits(struct drbd_conf *mdev, 3959b411b363SPhilipp Reisner struct p_compressed_bm *p, 3960c6d25cfeSPhilipp Reisner struct bm_xfer_ctx *c, 3961c6d25cfeSPhilipp Reisner unsigned int len) 3962b411b363SPhilipp Reisner { 3963b411b363SPhilipp Reisner struct bitstream bs; 3964b411b363SPhilipp Reisner u64 look_ahead; 3965b411b363SPhilipp Reisner u64 rl; 3966b411b363SPhilipp Reisner u64 tmp; 3967b411b363SPhilipp Reisner unsigned long s = c->bit_offset; 3968b411b363SPhilipp Reisner unsigned long e; 3969a02d1240SAndreas Gruenbacher int toggle = dcbp_get_start(p); 3970b411b363SPhilipp Reisner int have; 3971b411b363SPhilipp Reisner int bits; 3972b411b363SPhilipp Reisner 3973a02d1240SAndreas Gruenbacher bitstream_init(&bs, p->code, len, dcbp_get_pad_bits(p)); 3974b411b363SPhilipp Reisner 3975b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &look_ahead, 64); 3976b411b363SPhilipp Reisner if (bits < 0) 39772c46407dSAndreas Gruenbacher return -EIO; 3978b411b363SPhilipp Reisner 3979b411b363SPhilipp Reisner for (have = bits; have > 0; s += rl, toggle = !toggle) { 3980b411b363SPhilipp Reisner bits = vli_decode_bits(&rl, look_ahead); 3981b411b363SPhilipp Reisner if (bits <= 0) 39822c46407dSAndreas Gruenbacher return -EIO; 3983b411b363SPhilipp Reisner 3984b411b363SPhilipp Reisner if (toggle) { 3985b411b363SPhilipp Reisner e = s + rl -1; 3986b411b363SPhilipp Reisner if (e >= c->bm_bits) { 3987b411b363SPhilipp Reisner dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); 39882c46407dSAndreas Gruenbacher return -EIO; 3989b411b363SPhilipp Reisner } 3990b411b363SPhilipp Reisner _drbd_bm_set_bits(mdev, s, e); 3991b411b363SPhilipp Reisner } 3992b411b363SPhilipp Reisner 3993b411b363SPhilipp Reisner if (have < bits) { 3994b411b363SPhilipp Reisner dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", 3995b411b363SPhilipp Reisner have, bits, look_ahead, 3996b411b363SPhilipp Reisner (unsigned int)(bs.cur.b - p->code), 3997b411b363SPhilipp Reisner (unsigned int)bs.buf_len); 39982c46407dSAndreas Gruenbacher return -EIO; 3999b411b363SPhilipp Reisner } 4000b411b363SPhilipp Reisner look_ahead >>= bits; 4001b411b363SPhilipp Reisner have -= bits; 4002b411b363SPhilipp Reisner 4003b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &tmp, 64 - have); 4004b411b363SPhilipp Reisner if (bits < 0) 40052c46407dSAndreas Gruenbacher return -EIO; 4006b411b363SPhilipp Reisner look_ahead |= tmp << have; 4007b411b363SPhilipp Reisner have += bits; 4008b411b363SPhilipp Reisner } 4009b411b363SPhilipp Reisner 4010b411b363SPhilipp Reisner c->bit_offset = s; 4011b411b363SPhilipp Reisner bm_xfer_ctx_bit_to_word_offset(c); 4012b411b363SPhilipp Reisner 40132c46407dSAndreas Gruenbacher return (s != c->bm_bits); 4014b411b363SPhilipp Reisner } 4015b411b363SPhilipp Reisner 40162c46407dSAndreas Gruenbacher /** 40172c46407dSAndreas Gruenbacher * decode_bitmap_c 40182c46407dSAndreas Gruenbacher * 40192c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 40202c46407dSAndreas Gruenbacher * code upon failure. 40212c46407dSAndreas Gruenbacher */ 40222c46407dSAndreas Gruenbacher static int 4023b411b363SPhilipp Reisner decode_bitmap_c(struct drbd_conf *mdev, 4024b411b363SPhilipp Reisner struct p_compressed_bm *p, 4025c6d25cfeSPhilipp Reisner struct bm_xfer_ctx *c, 4026c6d25cfeSPhilipp Reisner unsigned int len) 4027b411b363SPhilipp Reisner { 4028a02d1240SAndreas Gruenbacher if (dcbp_get_code(p) == RLE_VLI_Bits) 4029e658983aSAndreas Gruenbacher return recv_bm_rle_bits(mdev, p, c, len - sizeof(*p)); 4030b411b363SPhilipp Reisner 4031b411b363SPhilipp Reisner /* other variants had been implemented for evaluation, 4032b411b363SPhilipp Reisner * but have been dropped as this one turned out to be "best" 4033b411b363SPhilipp Reisner * during all our tests. */ 4034b411b363SPhilipp Reisner 4035b411b363SPhilipp Reisner dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding); 403638fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); 40372c46407dSAndreas Gruenbacher return -EIO; 4038b411b363SPhilipp Reisner } 4039b411b363SPhilipp Reisner 4040b411b363SPhilipp Reisner void INFO_bm_xfer_stats(struct drbd_conf *mdev, 4041b411b363SPhilipp Reisner const char *direction, struct bm_xfer_ctx *c) 4042b411b363SPhilipp Reisner { 4043b411b363SPhilipp Reisner /* what would it take to transfer it "plaintext" */ 404450d0b1adSAndreas Gruenbacher unsigned int header_size = drbd_header_size(mdev->tconn); 404550d0b1adSAndreas Gruenbacher unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - header_size; 404650d0b1adSAndreas Gruenbacher unsigned int plain = 404750d0b1adSAndreas Gruenbacher header_size * (DIV_ROUND_UP(c->bm_words, data_size) + 1) + 404850d0b1adSAndreas Gruenbacher c->bm_words * sizeof(unsigned long); 404950d0b1adSAndreas Gruenbacher unsigned int total = c->bytes[0] + c->bytes[1]; 405050d0b1adSAndreas Gruenbacher unsigned int r; 4051b411b363SPhilipp Reisner 4052b411b363SPhilipp Reisner /* total can not be zero. but just in case: */ 4053b411b363SPhilipp Reisner if (total == 0) 4054b411b363SPhilipp Reisner return; 4055b411b363SPhilipp Reisner 4056b411b363SPhilipp Reisner /* don't report if not compressed */ 4057b411b363SPhilipp Reisner if (total >= plain) 4058b411b363SPhilipp Reisner return; 4059b411b363SPhilipp Reisner 4060b411b363SPhilipp Reisner /* total < plain. check for overflow, still */ 4061b411b363SPhilipp Reisner r = (total > UINT_MAX/1000) ? (total / (plain/1000)) 4062b411b363SPhilipp Reisner : (1000 * total / plain); 4063b411b363SPhilipp Reisner 4064b411b363SPhilipp Reisner if (r > 1000) 4065b411b363SPhilipp Reisner r = 1000; 4066b411b363SPhilipp Reisner 4067b411b363SPhilipp Reisner r = 1000 - r; 4068b411b363SPhilipp Reisner dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " 4069b411b363SPhilipp Reisner "total %u; compression: %u.%u%%\n", 4070b411b363SPhilipp Reisner direction, 4071b411b363SPhilipp Reisner c->bytes[1], c->packets[1], 4072b411b363SPhilipp Reisner c->bytes[0], c->packets[0], 4073b411b363SPhilipp Reisner total, r/10, r % 10); 4074b411b363SPhilipp Reisner } 4075b411b363SPhilipp Reisner 4076b411b363SPhilipp Reisner /* Since we are processing the bitfield from lower addresses to higher, 4077b411b363SPhilipp Reisner it does not matter if the process it in 32 bit chunks or 64 bit 4078b411b363SPhilipp Reisner chunks as long as it is little endian. (Understand it as byte stream, 4079b411b363SPhilipp Reisner beginning with the lowest byte...) If we would use big endian 4080b411b363SPhilipp Reisner we would need to process it from the highest address to the lowest, 4081b411b363SPhilipp Reisner in order to be agnostic to the 32 vs 64 bits issue. 4082b411b363SPhilipp Reisner 4083b411b363SPhilipp Reisner returns 0 on failure, 1 if we successfully received it. */ 40844a76b161SAndreas Gruenbacher static int receive_bitmap(struct drbd_tconn *tconn, struct packet_info *pi) 4085b411b363SPhilipp Reisner { 40864a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 4087b411b363SPhilipp Reisner struct bm_xfer_ctx c; 40882c46407dSAndreas Gruenbacher int err; 40894a76b161SAndreas Gruenbacher 40904a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 40914a76b161SAndreas Gruenbacher if (!mdev) 40924a76b161SAndreas Gruenbacher return -EIO; 4093b411b363SPhilipp Reisner 409420ceb2b2SLars Ellenberg drbd_bm_lock(mdev, "receive bitmap", BM_LOCKED_SET_ALLOWED); 409520ceb2b2SLars Ellenberg /* you are supposed to send additional out-of-sync information 409620ceb2b2SLars Ellenberg * if you actually set bits during this phase */ 4097b411b363SPhilipp Reisner 4098b411b363SPhilipp Reisner c = (struct bm_xfer_ctx) { 4099b411b363SPhilipp Reisner .bm_bits = drbd_bm_bits(mdev), 4100b411b363SPhilipp Reisner .bm_words = drbd_bm_words(mdev), 4101b411b363SPhilipp Reisner }; 4102b411b363SPhilipp Reisner 41032c46407dSAndreas Gruenbacher for(;;) { 4104e658983aSAndreas Gruenbacher if (pi->cmd == P_BITMAP) 4105e658983aSAndreas Gruenbacher err = receive_bitmap_plain(mdev, pi->size, pi->data, &c); 4106e658983aSAndreas Gruenbacher else if (pi->cmd == P_COMPRESSED_BITMAP) { 4107b411b363SPhilipp Reisner /* MAYBE: sanity check that we speak proto >= 90, 4108b411b363SPhilipp Reisner * and the feature is enabled! */ 4109e658983aSAndreas Gruenbacher struct p_compressed_bm *p = pi->data; 4110b411b363SPhilipp Reisner 411150d0b1adSAndreas Gruenbacher if (pi->size > DRBD_SOCKET_BUFFER_SIZE - drbd_header_size(tconn)) { 4112b411b363SPhilipp Reisner dev_err(DEV, "ReportCBitmap packet too large\n"); 411382bc0194SAndreas Gruenbacher err = -EIO; 4114b411b363SPhilipp Reisner goto out; 4115b411b363SPhilipp Reisner } 4116e658983aSAndreas Gruenbacher if (pi->size <= sizeof(*p)) { 4117e2857216SAndreas Gruenbacher dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", pi->size); 411882bc0194SAndreas Gruenbacher err = -EIO; 411978fcbdaeSAndreas Gruenbacher goto out; 4120b411b363SPhilipp Reisner } 4121e658983aSAndreas Gruenbacher err = drbd_recv_all(mdev->tconn, p, pi->size); 4122e658983aSAndreas Gruenbacher if (err) 4123e658983aSAndreas Gruenbacher goto out; 4124e2857216SAndreas Gruenbacher err = decode_bitmap_c(mdev, p, &c, pi->size); 4125b411b363SPhilipp Reisner } else { 4126e2857216SAndreas Gruenbacher dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", pi->cmd); 412782bc0194SAndreas Gruenbacher err = -EIO; 4128b411b363SPhilipp Reisner goto out; 4129b411b363SPhilipp Reisner } 4130b411b363SPhilipp Reisner 4131e2857216SAndreas Gruenbacher c.packets[pi->cmd == P_BITMAP]++; 413250d0b1adSAndreas Gruenbacher c.bytes[pi->cmd == P_BITMAP] += drbd_header_size(tconn) + pi->size; 4133b411b363SPhilipp Reisner 41342c46407dSAndreas Gruenbacher if (err <= 0) { 41352c46407dSAndreas Gruenbacher if (err < 0) 41362c46407dSAndreas Gruenbacher goto out; 4137b411b363SPhilipp Reisner break; 41382c46407dSAndreas Gruenbacher } 4139e2857216SAndreas Gruenbacher err = drbd_recv_header(mdev->tconn, pi); 414082bc0194SAndreas Gruenbacher if (err) 4141b411b363SPhilipp Reisner goto out; 41422c46407dSAndreas Gruenbacher } 4143b411b363SPhilipp Reisner 4144b411b363SPhilipp Reisner INFO_bm_xfer_stats(mdev, "receive", &c); 4145b411b363SPhilipp Reisner 4146b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_BITMAP_T) { 4147de1f8e4aSAndreas Gruenbacher enum drbd_state_rv rv; 4148de1f8e4aSAndreas Gruenbacher 414982bc0194SAndreas Gruenbacher err = drbd_send_bitmap(mdev); 415082bc0194SAndreas Gruenbacher if (err) 4151b411b363SPhilipp Reisner goto out; 4152b411b363SPhilipp Reisner /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ 4153de1f8e4aSAndreas Gruenbacher rv = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); 4154de1f8e4aSAndreas Gruenbacher D_ASSERT(rv == SS_SUCCESS); 4155b411b363SPhilipp Reisner } else if (mdev->state.conn != C_WF_BITMAP_S) { 4156b411b363SPhilipp Reisner /* admin may have requested C_DISCONNECTING, 4157b411b363SPhilipp Reisner * other threads may have noticed network errors */ 4158b411b363SPhilipp Reisner dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n", 4159b411b363SPhilipp Reisner drbd_conn_str(mdev->state.conn)); 4160b411b363SPhilipp Reisner } 416182bc0194SAndreas Gruenbacher err = 0; 4162b411b363SPhilipp Reisner 4163b411b363SPhilipp Reisner out: 416420ceb2b2SLars Ellenberg drbd_bm_unlock(mdev); 416582bc0194SAndreas Gruenbacher if (!err && mdev->state.conn == C_WF_BITMAP_S) 4166b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_SOURCE); 416782bc0194SAndreas Gruenbacher return err; 4168b411b363SPhilipp Reisner } 4169b411b363SPhilipp Reisner 41704a76b161SAndreas Gruenbacher static int receive_skip(struct drbd_tconn *tconn, struct packet_info *pi) 4171b411b363SPhilipp Reisner { 41724a76b161SAndreas Gruenbacher conn_warn(tconn, "skipping unknown optional packet type %d, l: %d!\n", 4173e2857216SAndreas Gruenbacher pi->cmd, pi->size); 41742de876efSPhilipp Reisner 41754a76b161SAndreas Gruenbacher return ignore_remaining_packet(tconn, pi); 41762de876efSPhilipp Reisner } 41772de876efSPhilipp Reisner 41784a76b161SAndreas Gruenbacher static int receive_UnplugRemote(struct drbd_tconn *tconn, struct packet_info *pi) 4179b411b363SPhilipp Reisner { 4180b411b363SPhilipp Reisner /* Make sure we've acked all the TCP data associated 4181b411b363SPhilipp Reisner * with the data requests being unplugged */ 41824a76b161SAndreas Gruenbacher drbd_tcp_quickack(tconn->data.socket); 4183b411b363SPhilipp Reisner 418482bc0194SAndreas Gruenbacher return 0; 4185b411b363SPhilipp Reisner } 4186b411b363SPhilipp Reisner 41874a76b161SAndreas Gruenbacher static int receive_out_of_sync(struct drbd_tconn *tconn, struct packet_info *pi) 418873a01a18SPhilipp Reisner { 41894a76b161SAndreas Gruenbacher struct drbd_conf *mdev; 4190e658983aSAndreas Gruenbacher struct p_block_desc *p = pi->data; 41914a76b161SAndreas Gruenbacher 41924a76b161SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 41934a76b161SAndreas Gruenbacher if (!mdev) 41944a76b161SAndreas Gruenbacher return -EIO; 419573a01a18SPhilipp Reisner 4196f735e363SLars Ellenberg switch (mdev->state.conn) { 4197f735e363SLars Ellenberg case C_WF_SYNC_UUID: 4198f735e363SLars Ellenberg case C_WF_BITMAP_T: 4199f735e363SLars Ellenberg case C_BEHIND: 4200f735e363SLars Ellenberg break; 4201f735e363SLars Ellenberg default: 4202f735e363SLars Ellenberg dev_err(DEV, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n", 4203f735e363SLars Ellenberg drbd_conn_str(mdev->state.conn)); 4204f735e363SLars Ellenberg } 4205f735e363SLars Ellenberg 420673a01a18SPhilipp Reisner drbd_set_out_of_sync(mdev, be64_to_cpu(p->sector), be32_to_cpu(p->blksize)); 420773a01a18SPhilipp Reisner 420882bc0194SAndreas Gruenbacher return 0; 420973a01a18SPhilipp Reisner } 421073a01a18SPhilipp Reisner 421102918be2SPhilipp Reisner struct data_cmd { 421202918be2SPhilipp Reisner int expect_payload; 421302918be2SPhilipp Reisner size_t pkt_size; 42144a76b161SAndreas Gruenbacher int (*fn)(struct drbd_tconn *, struct packet_info *); 4215b411b363SPhilipp Reisner }; 4216b411b363SPhilipp Reisner 421702918be2SPhilipp Reisner static struct data_cmd drbd_cmd_handler[] = { 42184a76b161SAndreas Gruenbacher [P_DATA] = { 1, sizeof(struct p_data), receive_Data }, 42194a76b161SAndreas Gruenbacher [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply }, 42204a76b161SAndreas Gruenbacher [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } , 42214a76b161SAndreas Gruenbacher [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } , 4222e658983aSAndreas Gruenbacher [P_BITMAP] = { 1, 0, receive_bitmap } , 4223e658983aSAndreas Gruenbacher [P_COMPRESSED_BITMAP] = { 1, 0, receive_bitmap } , 4224e658983aSAndreas Gruenbacher [P_UNPLUG_REMOTE] = { 0, 0, receive_UnplugRemote }, 42254a76b161SAndreas Gruenbacher [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 42264a76b161SAndreas Gruenbacher [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 4227e658983aSAndreas Gruenbacher [P_SYNC_PARAM] = { 1, 0, receive_SyncParam }, 4228e658983aSAndreas Gruenbacher [P_SYNC_PARAM89] = { 1, 0, receive_SyncParam }, 42294a76b161SAndreas Gruenbacher [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol }, 42304a76b161SAndreas Gruenbacher [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids }, 42314a76b161SAndreas Gruenbacher [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes }, 42324a76b161SAndreas Gruenbacher [P_STATE] = { 0, sizeof(struct p_state), receive_state }, 42334a76b161SAndreas Gruenbacher [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state }, 42344a76b161SAndreas Gruenbacher [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid }, 42354a76b161SAndreas Gruenbacher [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 42364a76b161SAndreas Gruenbacher [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 42374a76b161SAndreas Gruenbacher [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 42384a76b161SAndreas Gruenbacher [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip }, 42394a76b161SAndreas Gruenbacher [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync }, 42404a76b161SAndreas Gruenbacher [P_CONN_ST_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_conn_state }, 4241036b17eaSPhilipp Reisner [P_PROTOCOL_UPDATE] = { 1, sizeof(struct p_protocol), receive_protocol }, 424202918be2SPhilipp Reisner }; 424302918be2SPhilipp Reisner 4244eefc2f7dSPhilipp Reisner static void drbdd(struct drbd_tconn *tconn) 4245b411b363SPhilipp Reisner { 424677351055SPhilipp Reisner struct packet_info pi; 424702918be2SPhilipp Reisner size_t shs; /* sub header size */ 424882bc0194SAndreas Gruenbacher int err; 4249b411b363SPhilipp Reisner 4250eefc2f7dSPhilipp Reisner while (get_t_state(&tconn->receiver) == RUNNING) { 4251deebe195SAndreas Gruenbacher struct data_cmd *cmd; 4252deebe195SAndreas Gruenbacher 4253eefc2f7dSPhilipp Reisner drbd_thread_current_set_cpu(&tconn->receiver); 425469bc7bc3SAndreas Gruenbacher if (drbd_recv_header(tconn, &pi)) 425502918be2SPhilipp Reisner goto err_out; 425602918be2SPhilipp Reisner 4257deebe195SAndreas Gruenbacher cmd = &drbd_cmd_handler[pi.cmd]; 42584a76b161SAndreas Gruenbacher if (unlikely(pi.cmd >= ARRAY_SIZE(drbd_cmd_handler) || !cmd->fn)) { 4259eefc2f7dSPhilipp Reisner conn_err(tconn, "unknown packet type %d, l: %d!\n", pi.cmd, pi.size); 426002918be2SPhilipp Reisner goto err_out; 42610b33a916SLars Ellenberg } 4262b411b363SPhilipp Reisner 4263e658983aSAndreas Gruenbacher shs = cmd->pkt_size; 4264e658983aSAndreas Gruenbacher if (pi.size > shs && !cmd->expect_payload) { 4265eefc2f7dSPhilipp Reisner conn_err(tconn, "No payload expected %s l:%d\n", cmdname(pi.cmd), pi.size); 4266c13f7e1aSLars Ellenberg goto err_out; 4267c13f7e1aSLars Ellenberg } 4268c13f7e1aSLars Ellenberg 4269c13f7e1aSLars Ellenberg if (shs) { 4270e658983aSAndreas Gruenbacher err = drbd_recv_all_warn(tconn, pi.data, shs); 4271a5c31904SAndreas Gruenbacher if (err) 427202918be2SPhilipp Reisner goto err_out; 4273e2857216SAndreas Gruenbacher pi.size -= shs; 4274b411b363SPhilipp Reisner } 427502918be2SPhilipp Reisner 42764a76b161SAndreas Gruenbacher err = cmd->fn(tconn, &pi); 42774a76b161SAndreas Gruenbacher if (err) { 42789f5bdc33SAndreas Gruenbacher conn_err(tconn, "error receiving %s, e: %d l: %d!\n", 42799f5bdc33SAndreas Gruenbacher cmdname(pi.cmd), err, pi.size); 428002918be2SPhilipp Reisner goto err_out; 4281b411b363SPhilipp Reisner } 4282b411b363SPhilipp Reisner } 428382bc0194SAndreas Gruenbacher return; 428402918be2SPhilipp Reisner 428502918be2SPhilipp Reisner err_out: 4286bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); 4287b411b363SPhilipp Reisner } 4288b411b363SPhilipp Reisner 42890e29d163SPhilipp Reisner void conn_flush_workqueue(struct drbd_tconn *tconn) 4290b411b363SPhilipp Reisner { 4291b411b363SPhilipp Reisner struct drbd_wq_barrier barr; 4292b411b363SPhilipp Reisner 4293b411b363SPhilipp Reisner barr.w.cb = w_prev_work_done; 42940e29d163SPhilipp Reisner barr.w.tconn = tconn; 4295b411b363SPhilipp Reisner init_completion(&barr.done); 42960e29d163SPhilipp Reisner drbd_queue_work(&tconn->data.work, &barr.w); 4297b411b363SPhilipp Reisner wait_for_completion(&barr.done); 4298b411b363SPhilipp Reisner } 4299b411b363SPhilipp Reisner 430081fa2e67SPhilipp Reisner static void conn_disconnect(struct drbd_tconn *tconn) 4301b411b363SPhilipp Reisner { 4302c141ebdaSPhilipp Reisner struct drbd_conf *mdev; 4303bbeb641cSPhilipp Reisner enum drbd_conns oc; 4304c141ebdaSPhilipp Reisner int vnr, rv = SS_UNKNOWN_ERROR; 4305b411b363SPhilipp Reisner 4306bbeb641cSPhilipp Reisner if (tconn->cstate == C_STANDALONE) 4307b411b363SPhilipp Reisner return; 4308b411b363SPhilipp Reisner 4309b411b363SPhilipp Reisner /* asender does not clean up anything. it must not interfere, either */ 4310360cc740SPhilipp Reisner drbd_thread_stop(&tconn->asender); 4311360cc740SPhilipp Reisner drbd_free_sock(tconn); 4312360cc740SPhilipp Reisner 4313c141ebdaSPhilipp Reisner rcu_read_lock(); 4314c141ebdaSPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, vnr) { 4315c141ebdaSPhilipp Reisner kref_get(&mdev->kref); 4316c141ebdaSPhilipp Reisner rcu_read_unlock(); 4317c141ebdaSPhilipp Reisner drbd_disconnected(mdev); 4318c141ebdaSPhilipp Reisner kref_put(&mdev->kref, &drbd_minor_destroy); 4319c141ebdaSPhilipp Reisner rcu_read_lock(); 4320c141ebdaSPhilipp Reisner } 4321c141ebdaSPhilipp Reisner rcu_read_unlock(); 4322c141ebdaSPhilipp Reisner 4323360cc740SPhilipp Reisner conn_info(tconn, "Connection closed\n"); 4324360cc740SPhilipp Reisner 4325cb703454SPhilipp Reisner if (conn_highest_role(tconn) == R_PRIMARY && conn_highest_pdsk(tconn) >= D_UNKNOWN) 4326cb703454SPhilipp Reisner conn_try_outdate_peer_async(tconn); 4327cb703454SPhilipp Reisner 4328360cc740SPhilipp Reisner spin_lock_irq(&tconn->req_lock); 4329bbeb641cSPhilipp Reisner oc = tconn->cstate; 4330bbeb641cSPhilipp Reisner if (oc >= C_UNCONNECTED) 4331bbeb641cSPhilipp Reisner rv = _conn_request_state(tconn, NS(conn, C_UNCONNECTED), CS_VERBOSE); 4332bbeb641cSPhilipp Reisner 4333360cc740SPhilipp Reisner spin_unlock_irq(&tconn->req_lock); 4334360cc740SPhilipp Reisner 4335f3dfa40aSLars Ellenberg if (oc == C_DISCONNECTING) 4336d9cc6e23SLars Ellenberg conn_request_state(tconn, NS(conn, C_STANDALONE), CS_VERBOSE | CS_HARD); 4337360cc740SPhilipp Reisner } 4338360cc740SPhilipp Reisner 4339c141ebdaSPhilipp Reisner static int drbd_disconnected(struct drbd_conf *mdev) 4340360cc740SPhilipp Reisner { 4341360cc740SPhilipp Reisner enum drbd_fencing_p fp; 4342360cc740SPhilipp Reisner unsigned int i; 4343b411b363SPhilipp Reisner 434485719573SPhilipp Reisner /* wait for current activity to cease. */ 434587eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 4346b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 4347b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee); 4348b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->read_ee); 434987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 4350b411b363SPhilipp Reisner 4351b411b363SPhilipp Reisner /* We do not have data structures that would allow us to 4352b411b363SPhilipp Reisner * get the rs_pending_cnt down to 0 again. 4353b411b363SPhilipp Reisner * * On C_SYNC_TARGET we do not have any data structures describing 4354b411b363SPhilipp Reisner * the pending RSDataRequest's we have sent. 4355b411b363SPhilipp Reisner * * On C_SYNC_SOURCE there is no data structure that tracks 4356b411b363SPhilipp Reisner * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. 4357b411b363SPhilipp Reisner * And no, it is not the sum of the reference counts in the 4358b411b363SPhilipp Reisner * resync_LRU. The resync_LRU tracks the whole operation including 4359b411b363SPhilipp Reisner * the disk-IO, while the rs_pending_cnt only tracks the blocks 4360b411b363SPhilipp Reisner * on the fly. */ 4361b411b363SPhilipp Reisner drbd_rs_cancel_all(mdev); 4362b411b363SPhilipp Reisner mdev->rs_total = 0; 4363b411b363SPhilipp Reisner mdev->rs_failed = 0; 4364b411b363SPhilipp Reisner atomic_set(&mdev->rs_pending_cnt, 0); 4365b411b363SPhilipp Reisner wake_up(&mdev->misc_wait); 4366b411b363SPhilipp Reisner 43677fde2be9SPhilipp Reisner del_timer(&mdev->request_timer); 43687fde2be9SPhilipp Reisner 4369b411b363SPhilipp Reisner del_timer_sync(&mdev->resync_timer); 4370b411b363SPhilipp Reisner resync_timer_fn((unsigned long)mdev); 4371b411b363SPhilipp Reisner 4372b411b363SPhilipp Reisner /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, 4373b411b363SPhilipp Reisner * w_make_resync_request etc. which may still be on the worker queue 4374b411b363SPhilipp Reisner * to be "canceled" */ 4375a21e9298SPhilipp Reisner drbd_flush_workqueue(mdev); 4376b411b363SPhilipp Reisner 4377a990be46SAndreas Gruenbacher drbd_finish_peer_reqs(mdev); 4378b411b363SPhilipp Reisner 4379b411b363SPhilipp Reisner kfree(mdev->p_uuid); 4380b411b363SPhilipp Reisner mdev->p_uuid = NULL; 4381b411b363SPhilipp Reisner 43822aebfabbSPhilipp Reisner if (!drbd_suspended(mdev)) 43832f5cdd0bSPhilipp Reisner tl_clear(mdev->tconn); 4384b411b363SPhilipp Reisner 4385b411b363SPhilipp Reisner drbd_md_sync(mdev); 4386b411b363SPhilipp Reisner 4387b411b363SPhilipp Reisner fp = FP_DONT_CARE; 4388b411b363SPhilipp Reisner if (get_ldev(mdev)) { 4389daeda1ccSPhilipp Reisner rcu_read_lock(); 4390daeda1ccSPhilipp Reisner fp = rcu_dereference(mdev->ldev->disk_conf)->fencing; 4391daeda1ccSPhilipp Reisner rcu_read_unlock(); 4392b411b363SPhilipp Reisner put_ldev(mdev); 4393b411b363SPhilipp Reisner } 4394b411b363SPhilipp Reisner 439520ceb2b2SLars Ellenberg /* serialize with bitmap writeout triggered by the state change, 439620ceb2b2SLars Ellenberg * if any. */ 439720ceb2b2SLars Ellenberg wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags)); 439820ceb2b2SLars Ellenberg 4399b411b363SPhilipp Reisner /* tcp_close and release of sendpage pages can be deferred. I don't 4400b411b363SPhilipp Reisner * want to use SO_LINGER, because apparently it can be deferred for 4401b411b363SPhilipp Reisner * more than 20 seconds (longest time I checked). 4402b411b363SPhilipp Reisner * 4403b411b363SPhilipp Reisner * Actually we don't care for exactly when the network stack does its 4404b411b363SPhilipp Reisner * put_page(), but release our reference on these pages right here. 4405b411b363SPhilipp Reisner */ 44067721f567SAndreas Gruenbacher i = drbd_free_peer_reqs(mdev, &mdev->net_ee); 4407b411b363SPhilipp Reisner if (i) 4408b411b363SPhilipp Reisner dev_info(DEV, "net_ee not empty, killed %u entries\n", i); 4409435f0740SLars Ellenberg i = atomic_read(&mdev->pp_in_use_by_net); 4410435f0740SLars Ellenberg if (i) 4411435f0740SLars Ellenberg dev_info(DEV, "pp_in_use_by_net = %d, expected 0\n", i); 4412b411b363SPhilipp Reisner i = atomic_read(&mdev->pp_in_use); 4413b411b363SPhilipp Reisner if (i) 441445bb912bSLars Ellenberg dev_info(DEV, "pp_in_use = %d, expected 0\n", i); 4415b411b363SPhilipp Reisner 4416b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->read_ee)); 4417b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->active_ee)); 4418b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->sync_ee)); 4419b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->done_ee)); 4420b411b363SPhilipp Reisner 4421b411b363SPhilipp Reisner /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ 4422b411b363SPhilipp Reisner atomic_set(&mdev->current_epoch->epoch_size, 0); 4423b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->current_epoch->list)); 4424360cc740SPhilipp Reisner 4425360cc740SPhilipp Reisner return 0; 4426b411b363SPhilipp Reisner } 4427b411b363SPhilipp Reisner 4428b411b363SPhilipp Reisner /* 4429b411b363SPhilipp Reisner * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version 4430b411b363SPhilipp Reisner * we can agree on is stored in agreed_pro_version. 4431b411b363SPhilipp Reisner * 4432b411b363SPhilipp Reisner * feature flags and the reserved array should be enough room for future 4433b411b363SPhilipp Reisner * enhancements of the handshake protocol, and possible plugins... 4434b411b363SPhilipp Reisner * 4435b411b363SPhilipp Reisner * for now, they are expected to be zero, but ignored. 4436b411b363SPhilipp Reisner */ 44376038178eSAndreas Gruenbacher static int drbd_send_features(struct drbd_tconn *tconn) 4438b411b363SPhilipp Reisner { 44399f5bdc33SAndreas Gruenbacher struct drbd_socket *sock; 44409f5bdc33SAndreas Gruenbacher struct p_connection_features *p; 4441b411b363SPhilipp Reisner 44429f5bdc33SAndreas Gruenbacher sock = &tconn->data; 44439f5bdc33SAndreas Gruenbacher p = conn_prepare_command(tconn, sock); 44449f5bdc33SAndreas Gruenbacher if (!p) 4445e8d17b01SAndreas Gruenbacher return -EIO; 4446b411b363SPhilipp Reisner memset(p, 0, sizeof(*p)); 4447b411b363SPhilipp Reisner p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); 4448b411b363SPhilipp Reisner p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); 44499f5bdc33SAndreas Gruenbacher return conn_send_command(tconn, sock, P_CONNECTION_FEATURES, sizeof(*p), NULL, 0); 4450b411b363SPhilipp Reisner } 4451b411b363SPhilipp Reisner 4452b411b363SPhilipp Reisner /* 4453b411b363SPhilipp Reisner * return values: 4454b411b363SPhilipp Reisner * 1 yes, we have a valid connection 4455b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 4456b411b363SPhilipp Reisner * -1 peer talks different language, 4457b411b363SPhilipp Reisner * no point in trying again, please go standalone. 4458b411b363SPhilipp Reisner */ 44596038178eSAndreas Gruenbacher static int drbd_do_features(struct drbd_tconn *tconn) 4460b411b363SPhilipp Reisner { 446165d11ed6SPhilipp Reisner /* ASSERT current == tconn->receiver ... */ 4462e658983aSAndreas Gruenbacher struct p_connection_features *p; 4463e658983aSAndreas Gruenbacher const int expect = sizeof(struct p_connection_features); 446477351055SPhilipp Reisner struct packet_info pi; 4465a5c31904SAndreas Gruenbacher int err; 4466b411b363SPhilipp Reisner 44676038178eSAndreas Gruenbacher err = drbd_send_features(tconn); 4468e8d17b01SAndreas Gruenbacher if (err) 4469b411b363SPhilipp Reisner return 0; 4470b411b363SPhilipp Reisner 447169bc7bc3SAndreas Gruenbacher err = drbd_recv_header(tconn, &pi); 447269bc7bc3SAndreas Gruenbacher if (err) 4473b411b363SPhilipp Reisner return 0; 4474b411b363SPhilipp Reisner 44756038178eSAndreas Gruenbacher if (pi.cmd != P_CONNECTION_FEATURES) { 44766038178eSAndreas Gruenbacher conn_err(tconn, "expected ConnectionFeatures packet, received: %s (0x%04x)\n", 447777351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 4478b411b363SPhilipp Reisner return -1; 4479b411b363SPhilipp Reisner } 4480b411b363SPhilipp Reisner 448177351055SPhilipp Reisner if (pi.size != expect) { 44826038178eSAndreas Gruenbacher conn_err(tconn, "expected ConnectionFeatures length: %u, received: %u\n", 448377351055SPhilipp Reisner expect, pi.size); 4484b411b363SPhilipp Reisner return -1; 4485b411b363SPhilipp Reisner } 4486b411b363SPhilipp Reisner 4487e658983aSAndreas Gruenbacher p = pi.data; 4488e658983aSAndreas Gruenbacher err = drbd_recv_all_warn(tconn, p, expect); 4489a5c31904SAndreas Gruenbacher if (err) 4490b411b363SPhilipp Reisner return 0; 4491b411b363SPhilipp Reisner 4492b411b363SPhilipp Reisner p->protocol_min = be32_to_cpu(p->protocol_min); 4493b411b363SPhilipp Reisner p->protocol_max = be32_to_cpu(p->protocol_max); 4494b411b363SPhilipp Reisner if (p->protocol_max == 0) 4495b411b363SPhilipp Reisner p->protocol_max = p->protocol_min; 4496b411b363SPhilipp Reisner 4497b411b363SPhilipp Reisner if (PRO_VERSION_MAX < p->protocol_min || 4498b411b363SPhilipp Reisner PRO_VERSION_MIN > p->protocol_max) 4499b411b363SPhilipp Reisner goto incompat; 4500b411b363SPhilipp Reisner 450165d11ed6SPhilipp Reisner tconn->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); 4502b411b363SPhilipp Reisner 450365d11ed6SPhilipp Reisner conn_info(tconn, "Handshake successful: " 450465d11ed6SPhilipp Reisner "Agreed network protocol version %d\n", tconn->agreed_pro_version); 4505b411b363SPhilipp Reisner 4506b411b363SPhilipp Reisner return 1; 4507b411b363SPhilipp Reisner 4508b411b363SPhilipp Reisner incompat: 450965d11ed6SPhilipp Reisner conn_err(tconn, "incompatible DRBD dialects: " 4510b411b363SPhilipp Reisner "I support %d-%d, peer supports %d-%d\n", 4511b411b363SPhilipp Reisner PRO_VERSION_MIN, PRO_VERSION_MAX, 4512b411b363SPhilipp Reisner p->protocol_min, p->protocol_max); 4513b411b363SPhilipp Reisner return -1; 4514b411b363SPhilipp Reisner } 4515b411b363SPhilipp Reisner 4516b411b363SPhilipp Reisner #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) 451713e6037dSPhilipp Reisner static int drbd_do_auth(struct drbd_tconn *tconn) 4518b411b363SPhilipp Reisner { 4519b411b363SPhilipp Reisner dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); 4520b411b363SPhilipp Reisner dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); 4521b10d96cbSJohannes Thoma return -1; 4522b411b363SPhilipp Reisner } 4523b411b363SPhilipp Reisner #else 4524b411b363SPhilipp Reisner #define CHALLENGE_LEN 64 4525b10d96cbSJohannes Thoma 4526b10d96cbSJohannes Thoma /* Return value: 4527b10d96cbSJohannes Thoma 1 - auth succeeded, 4528b10d96cbSJohannes Thoma 0 - failed, try again (network error), 4529b10d96cbSJohannes Thoma -1 - auth failed, don't try again. 4530b10d96cbSJohannes Thoma */ 4531b10d96cbSJohannes Thoma 453213e6037dSPhilipp Reisner static int drbd_do_auth(struct drbd_tconn *tconn) 4533b411b363SPhilipp Reisner { 45349f5bdc33SAndreas Gruenbacher struct drbd_socket *sock; 4535b411b363SPhilipp Reisner char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ 4536b411b363SPhilipp Reisner struct scatterlist sg; 4537b411b363SPhilipp Reisner char *response = NULL; 4538b411b363SPhilipp Reisner char *right_response = NULL; 4539b411b363SPhilipp Reisner char *peers_ch = NULL; 454044ed167dSPhilipp Reisner unsigned int key_len; 454144ed167dSPhilipp Reisner char secret[SHARED_SECRET_MAX]; /* 64 byte */ 4542b411b363SPhilipp Reisner unsigned int resp_size; 4543b411b363SPhilipp Reisner struct hash_desc desc; 454477351055SPhilipp Reisner struct packet_info pi; 454544ed167dSPhilipp Reisner struct net_conf *nc; 454669bc7bc3SAndreas Gruenbacher int err, rv; 4547b411b363SPhilipp Reisner 45489f5bdc33SAndreas Gruenbacher /* FIXME: Put the challenge/response into the preallocated socket buffer. */ 45499f5bdc33SAndreas Gruenbacher 455044ed167dSPhilipp Reisner rcu_read_lock(); 455144ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 455244ed167dSPhilipp Reisner key_len = strlen(nc->shared_secret); 455344ed167dSPhilipp Reisner memcpy(secret, nc->shared_secret, key_len); 455444ed167dSPhilipp Reisner rcu_read_unlock(); 455544ed167dSPhilipp Reisner 455613e6037dSPhilipp Reisner desc.tfm = tconn->cram_hmac_tfm; 4557b411b363SPhilipp Reisner desc.flags = 0; 4558b411b363SPhilipp Reisner 455944ed167dSPhilipp Reisner rv = crypto_hash_setkey(tconn->cram_hmac_tfm, (u8 *)secret, key_len); 4560b411b363SPhilipp Reisner if (rv) { 456113e6037dSPhilipp Reisner conn_err(tconn, "crypto_hash_setkey() failed with %d\n", rv); 4562b10d96cbSJohannes Thoma rv = -1; 4563b411b363SPhilipp Reisner goto fail; 4564b411b363SPhilipp Reisner } 4565b411b363SPhilipp Reisner 4566b411b363SPhilipp Reisner get_random_bytes(my_challenge, CHALLENGE_LEN); 4567b411b363SPhilipp Reisner 45689f5bdc33SAndreas Gruenbacher sock = &tconn->data; 45699f5bdc33SAndreas Gruenbacher if (!conn_prepare_command(tconn, sock)) { 45709f5bdc33SAndreas Gruenbacher rv = 0; 45719f5bdc33SAndreas Gruenbacher goto fail; 45729f5bdc33SAndreas Gruenbacher } 4573e658983aSAndreas Gruenbacher rv = !conn_send_command(tconn, sock, P_AUTH_CHALLENGE, 0, 45749f5bdc33SAndreas Gruenbacher my_challenge, CHALLENGE_LEN); 4575b411b363SPhilipp Reisner if (!rv) 4576b411b363SPhilipp Reisner goto fail; 4577b411b363SPhilipp Reisner 457869bc7bc3SAndreas Gruenbacher err = drbd_recv_header(tconn, &pi); 457969bc7bc3SAndreas Gruenbacher if (err) { 458069bc7bc3SAndreas Gruenbacher rv = 0; 4581b411b363SPhilipp Reisner goto fail; 458269bc7bc3SAndreas Gruenbacher } 4583b411b363SPhilipp Reisner 458477351055SPhilipp Reisner if (pi.cmd != P_AUTH_CHALLENGE) { 458513e6037dSPhilipp Reisner conn_err(tconn, "expected AuthChallenge packet, received: %s (0x%04x)\n", 458677351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 4587b411b363SPhilipp Reisner rv = 0; 4588b411b363SPhilipp Reisner goto fail; 4589b411b363SPhilipp Reisner } 4590b411b363SPhilipp Reisner 459177351055SPhilipp Reisner if (pi.size > CHALLENGE_LEN * 2) { 459213e6037dSPhilipp Reisner conn_err(tconn, "expected AuthChallenge payload too big.\n"); 4593b10d96cbSJohannes Thoma rv = -1; 4594b411b363SPhilipp Reisner goto fail; 4595b411b363SPhilipp Reisner } 4596b411b363SPhilipp Reisner 459777351055SPhilipp Reisner peers_ch = kmalloc(pi.size, GFP_NOIO); 4598b411b363SPhilipp Reisner if (peers_ch == NULL) { 459913e6037dSPhilipp Reisner conn_err(tconn, "kmalloc of peers_ch failed\n"); 4600b10d96cbSJohannes Thoma rv = -1; 4601b411b363SPhilipp Reisner goto fail; 4602b411b363SPhilipp Reisner } 4603b411b363SPhilipp Reisner 4604a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(tconn, peers_ch, pi.size); 4605a5c31904SAndreas Gruenbacher if (err) { 4606b411b363SPhilipp Reisner rv = 0; 4607b411b363SPhilipp Reisner goto fail; 4608b411b363SPhilipp Reisner } 4609b411b363SPhilipp Reisner 461013e6037dSPhilipp Reisner resp_size = crypto_hash_digestsize(tconn->cram_hmac_tfm); 4611b411b363SPhilipp Reisner response = kmalloc(resp_size, GFP_NOIO); 4612b411b363SPhilipp Reisner if (response == NULL) { 461313e6037dSPhilipp Reisner conn_err(tconn, "kmalloc of response failed\n"); 4614b10d96cbSJohannes Thoma rv = -1; 4615b411b363SPhilipp Reisner goto fail; 4616b411b363SPhilipp Reisner } 4617b411b363SPhilipp Reisner 4618b411b363SPhilipp Reisner sg_init_table(&sg, 1); 461977351055SPhilipp Reisner sg_set_buf(&sg, peers_ch, pi.size); 4620b411b363SPhilipp Reisner 4621b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, response); 4622b411b363SPhilipp Reisner if (rv) { 462313e6037dSPhilipp Reisner conn_err(tconn, "crypto_hash_digest() failed with %d\n", rv); 4624b10d96cbSJohannes Thoma rv = -1; 4625b411b363SPhilipp Reisner goto fail; 4626b411b363SPhilipp Reisner } 4627b411b363SPhilipp Reisner 46289f5bdc33SAndreas Gruenbacher if (!conn_prepare_command(tconn, sock)) { 46299f5bdc33SAndreas Gruenbacher rv = 0; 46309f5bdc33SAndreas Gruenbacher goto fail; 46319f5bdc33SAndreas Gruenbacher } 4632e658983aSAndreas Gruenbacher rv = !conn_send_command(tconn, sock, P_AUTH_RESPONSE, 0, 46339f5bdc33SAndreas Gruenbacher response, resp_size); 4634b411b363SPhilipp Reisner if (!rv) 4635b411b363SPhilipp Reisner goto fail; 4636b411b363SPhilipp Reisner 463769bc7bc3SAndreas Gruenbacher err = drbd_recv_header(tconn, &pi); 463869bc7bc3SAndreas Gruenbacher if (err) { 463969bc7bc3SAndreas Gruenbacher rv = 0; 4640b411b363SPhilipp Reisner goto fail; 464169bc7bc3SAndreas Gruenbacher } 4642b411b363SPhilipp Reisner 464377351055SPhilipp Reisner if (pi.cmd != P_AUTH_RESPONSE) { 464413e6037dSPhilipp Reisner conn_err(tconn, "expected AuthResponse packet, received: %s (0x%04x)\n", 464577351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 4646b411b363SPhilipp Reisner rv = 0; 4647b411b363SPhilipp Reisner goto fail; 4648b411b363SPhilipp Reisner } 4649b411b363SPhilipp Reisner 465077351055SPhilipp Reisner if (pi.size != resp_size) { 465113e6037dSPhilipp Reisner conn_err(tconn, "expected AuthResponse payload of wrong size\n"); 4652b411b363SPhilipp Reisner rv = 0; 4653b411b363SPhilipp Reisner goto fail; 4654b411b363SPhilipp Reisner } 4655b411b363SPhilipp Reisner 4656a5c31904SAndreas Gruenbacher err = drbd_recv_all_warn(tconn, response , resp_size); 4657a5c31904SAndreas Gruenbacher if (err) { 4658b411b363SPhilipp Reisner rv = 0; 4659b411b363SPhilipp Reisner goto fail; 4660b411b363SPhilipp Reisner } 4661b411b363SPhilipp Reisner 4662b411b363SPhilipp Reisner right_response = kmalloc(resp_size, GFP_NOIO); 46632d1ee87dSJulia Lawall if (right_response == NULL) { 466413e6037dSPhilipp Reisner conn_err(tconn, "kmalloc of right_response failed\n"); 4665b10d96cbSJohannes Thoma rv = -1; 4666b411b363SPhilipp Reisner goto fail; 4667b411b363SPhilipp Reisner } 4668b411b363SPhilipp Reisner 4669b411b363SPhilipp Reisner sg_set_buf(&sg, my_challenge, CHALLENGE_LEN); 4670b411b363SPhilipp Reisner 4671b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, right_response); 4672b411b363SPhilipp Reisner if (rv) { 467313e6037dSPhilipp Reisner conn_err(tconn, "crypto_hash_digest() failed with %d\n", rv); 4674b10d96cbSJohannes Thoma rv = -1; 4675b411b363SPhilipp Reisner goto fail; 4676b411b363SPhilipp Reisner } 4677b411b363SPhilipp Reisner 4678b411b363SPhilipp Reisner rv = !memcmp(response, right_response, resp_size); 4679b411b363SPhilipp Reisner 4680b411b363SPhilipp Reisner if (rv) 468144ed167dSPhilipp Reisner conn_info(tconn, "Peer authenticated using %d bytes HMAC\n", 468244ed167dSPhilipp Reisner resp_size); 4683b10d96cbSJohannes Thoma else 4684b10d96cbSJohannes Thoma rv = -1; 4685b411b363SPhilipp Reisner 4686b411b363SPhilipp Reisner fail: 4687b411b363SPhilipp Reisner kfree(peers_ch); 4688b411b363SPhilipp Reisner kfree(response); 4689b411b363SPhilipp Reisner kfree(right_response); 4690b411b363SPhilipp Reisner 4691b411b363SPhilipp Reisner return rv; 4692b411b363SPhilipp Reisner } 4693b411b363SPhilipp Reisner #endif 4694b411b363SPhilipp Reisner 4695b411b363SPhilipp Reisner int drbdd_init(struct drbd_thread *thi) 4696b411b363SPhilipp Reisner { 4697392c8801SPhilipp Reisner struct drbd_tconn *tconn = thi->tconn; 4698b411b363SPhilipp Reisner int h; 4699b411b363SPhilipp Reisner 47004d641dd7SPhilipp Reisner conn_info(tconn, "receiver (re)started\n"); 4701b411b363SPhilipp Reisner 4702b411b363SPhilipp Reisner do { 470381fa2e67SPhilipp Reisner h = conn_connect(tconn); 4704b411b363SPhilipp Reisner if (h == 0) { 470581fa2e67SPhilipp Reisner conn_disconnect(tconn); 470620ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ); 4707b411b363SPhilipp Reisner } 4708b411b363SPhilipp Reisner if (h == -1) { 47094d641dd7SPhilipp Reisner conn_warn(tconn, "Discarding network configuration.\n"); 4710bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 4711b411b363SPhilipp Reisner } 4712b411b363SPhilipp Reisner } while (h == 0); 4713b411b363SPhilipp Reisner 471491fd4dadSPhilipp Reisner if (h > 0) 47154d641dd7SPhilipp Reisner drbdd(tconn); 4716b411b363SPhilipp Reisner 471781fa2e67SPhilipp Reisner conn_disconnect(tconn); 4718b411b363SPhilipp Reisner 47194d641dd7SPhilipp Reisner conn_info(tconn, "receiver terminated\n"); 4720b411b363SPhilipp Reisner return 0; 4721b411b363SPhilipp Reisner } 4722b411b363SPhilipp Reisner 4723b411b363SPhilipp Reisner /* ********* acknowledge sender ******** */ 4724b411b363SPhilipp Reisner 4725e05e1e59SAndreas Gruenbacher static int got_conn_RqSReply(struct drbd_tconn *tconn, struct packet_info *pi) 4726b411b363SPhilipp Reisner { 4727e658983aSAndreas Gruenbacher struct p_req_state_reply *p = pi->data; 4728b411b363SPhilipp Reisner int retcode = be32_to_cpu(p->retcode); 4729b411b363SPhilipp Reisner 4730fc3b10a4SPhilipp Reisner if (retcode >= SS_SUCCESS) { 4731fc3b10a4SPhilipp Reisner set_bit(CONN_WD_ST_CHG_OKAY, &tconn->flags); 4732fc3b10a4SPhilipp Reisner } else { 4733fc3b10a4SPhilipp Reisner set_bit(CONN_WD_ST_CHG_FAIL, &tconn->flags); 4734fc3b10a4SPhilipp Reisner conn_err(tconn, "Requested state change failed by peer: %s (%d)\n", 4735fc3b10a4SPhilipp Reisner drbd_set_st_err_str(retcode), retcode); 4736fc3b10a4SPhilipp Reisner } 4737fc3b10a4SPhilipp Reisner wake_up(&tconn->ping_wait); 4738e4f78edeSPhilipp Reisner 47392735a594SAndreas Gruenbacher return 0; 4740fc3b10a4SPhilipp Reisner } 4741e4f78edeSPhilipp Reisner 47421952e916SAndreas Gruenbacher static int got_RqSReply(struct drbd_tconn *tconn, struct packet_info *pi) 4743e4f78edeSPhilipp Reisner { 47441952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4745e658983aSAndreas Gruenbacher struct p_req_state_reply *p = pi->data; 4746e4f78edeSPhilipp Reisner int retcode = be32_to_cpu(p->retcode); 4747e4f78edeSPhilipp Reisner 47481952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 47491952e916SAndreas Gruenbacher if (!mdev) 47502735a594SAndreas Gruenbacher return -EIO; 47511952e916SAndreas Gruenbacher 4752e4f78edeSPhilipp Reisner if (retcode >= SS_SUCCESS) { 4753e4f78edeSPhilipp Reisner set_bit(CL_ST_CHG_SUCCESS, &mdev->flags); 4754e4f78edeSPhilipp Reisner } else { 4755e4f78edeSPhilipp Reisner set_bit(CL_ST_CHG_FAIL, &mdev->flags); 4756e4f78edeSPhilipp Reisner dev_err(DEV, "Requested state change failed by peer: %s (%d)\n", 4757e4f78edeSPhilipp Reisner drbd_set_st_err_str(retcode), retcode); 4758e4f78edeSPhilipp Reisner } 4759e4f78edeSPhilipp Reisner wake_up(&mdev->state_wait); 4760e4f78edeSPhilipp Reisner 47612735a594SAndreas Gruenbacher return 0; 4762b411b363SPhilipp Reisner } 4763b411b363SPhilipp Reisner 4764e05e1e59SAndreas Gruenbacher static int got_Ping(struct drbd_tconn *tconn, struct packet_info *pi) 4765b411b363SPhilipp Reisner { 47662735a594SAndreas Gruenbacher return drbd_send_ping_ack(tconn); 4767b411b363SPhilipp Reisner 4768b411b363SPhilipp Reisner } 4769b411b363SPhilipp Reisner 4770e05e1e59SAndreas Gruenbacher static int got_PingAck(struct drbd_tconn *tconn, struct packet_info *pi) 4771b411b363SPhilipp Reisner { 4772b411b363SPhilipp Reisner /* restore idle timeout */ 47732a67d8b9SPhilipp Reisner tconn->meta.socket->sk->sk_rcvtimeo = tconn->net_conf->ping_int*HZ; 47742a67d8b9SPhilipp Reisner if (!test_and_set_bit(GOT_PING_ACK, &tconn->flags)) 47752a67d8b9SPhilipp Reisner wake_up(&tconn->ping_wait); 4776b411b363SPhilipp Reisner 47772735a594SAndreas Gruenbacher return 0; 4778b411b363SPhilipp Reisner } 4779b411b363SPhilipp Reisner 47801952e916SAndreas Gruenbacher static int got_IsInSync(struct drbd_tconn *tconn, struct packet_info *pi) 4781b411b363SPhilipp Reisner { 47821952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4783e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4784b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4785b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4786b411b363SPhilipp Reisner 47871952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 47881952e916SAndreas Gruenbacher if (!mdev) 47892735a594SAndreas Gruenbacher return -EIO; 47901952e916SAndreas Gruenbacher 479131890f4aSPhilipp Reisner D_ASSERT(mdev->tconn->agreed_pro_version >= 89); 4792b411b363SPhilipp Reisner 4793b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4794b411b363SPhilipp Reisner 47951d53f09eSLars Ellenberg if (get_ldev(mdev)) { 4796b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4797b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4798b411b363SPhilipp Reisner /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ 4799b411b363SPhilipp Reisner mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); 48001d53f09eSLars Ellenberg put_ldev(mdev); 48011d53f09eSLars Ellenberg } 4802b411b363SPhilipp Reisner dec_rs_pending(mdev); 4803778f271dSPhilipp Reisner atomic_add(blksize >> 9, &mdev->rs_sect_in); 4804b411b363SPhilipp Reisner 48052735a594SAndreas Gruenbacher return 0; 4806b411b363SPhilipp Reisner } 4807b411b363SPhilipp Reisner 4808bc9c5c41SAndreas Gruenbacher static int 4809bc9c5c41SAndreas Gruenbacher validate_req_change_req_state(struct drbd_conf *mdev, u64 id, sector_t sector, 4810bc9c5c41SAndreas Gruenbacher struct rb_root *root, const char *func, 4811bc9c5c41SAndreas Gruenbacher enum drbd_req_event what, bool missing_ok) 4812b411b363SPhilipp Reisner { 4813b411b363SPhilipp Reisner struct drbd_request *req; 4814b411b363SPhilipp Reisner struct bio_and_error m; 4815b411b363SPhilipp Reisner 481687eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 4817bc9c5c41SAndreas Gruenbacher req = find_request(mdev, root, id, sector, missing_ok, func); 4818b411b363SPhilipp Reisner if (unlikely(!req)) { 481987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 482085997675SAndreas Gruenbacher return -EIO; 4821b411b363SPhilipp Reisner } 4822b411b363SPhilipp Reisner __req_mod(req, what, &m); 482387eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 4824b411b363SPhilipp Reisner 4825b411b363SPhilipp Reisner if (m.bio) 4826b411b363SPhilipp Reisner complete_master_bio(mdev, &m); 482785997675SAndreas Gruenbacher return 0; 4828b411b363SPhilipp Reisner } 4829b411b363SPhilipp Reisner 48301952e916SAndreas Gruenbacher static int got_BlockAck(struct drbd_tconn *tconn, struct packet_info *pi) 4831b411b363SPhilipp Reisner { 48321952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4833e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4834b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4835b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4836b411b363SPhilipp Reisner enum drbd_req_event what; 4837b411b363SPhilipp Reisner 48381952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 48391952e916SAndreas Gruenbacher if (!mdev) 48402735a594SAndreas Gruenbacher return -EIO; 48411952e916SAndreas Gruenbacher 4842b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4843b411b363SPhilipp Reisner 4844579b57edSAndreas Gruenbacher if (p->block_id == ID_SYNCER) { 4845b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4846b411b363SPhilipp Reisner dec_rs_pending(mdev); 48472735a594SAndreas Gruenbacher return 0; 4848b411b363SPhilipp Reisner } 4849e05e1e59SAndreas Gruenbacher switch (pi->cmd) { 4850b411b363SPhilipp Reisner case P_RS_WRITE_ACK: 48518554df1cSAndreas Gruenbacher what = WRITE_ACKED_BY_PEER_AND_SIS; 4852b411b363SPhilipp Reisner break; 4853b411b363SPhilipp Reisner case P_WRITE_ACK: 48548554df1cSAndreas Gruenbacher what = WRITE_ACKED_BY_PEER; 4855b411b363SPhilipp Reisner break; 4856b411b363SPhilipp Reisner case P_RECV_ACK: 48578554df1cSAndreas Gruenbacher what = RECV_ACKED_BY_PEER; 4858b411b363SPhilipp Reisner break; 48597be8da07SAndreas Gruenbacher case P_DISCARD_WRITE: 48607be8da07SAndreas Gruenbacher what = DISCARD_WRITE; 48617be8da07SAndreas Gruenbacher break; 48627be8da07SAndreas Gruenbacher case P_RETRY_WRITE: 48637be8da07SAndreas Gruenbacher what = POSTPONE_WRITE; 4864b411b363SPhilipp Reisner break; 4865b411b363SPhilipp Reisner default: 48662735a594SAndreas Gruenbacher BUG(); 4867b411b363SPhilipp Reisner } 4868b411b363SPhilipp Reisner 48692735a594SAndreas Gruenbacher return validate_req_change_req_state(mdev, p->block_id, sector, 4870bc9c5c41SAndreas Gruenbacher &mdev->write_requests, __func__, 4871bc9c5c41SAndreas Gruenbacher what, false); 4872b411b363SPhilipp Reisner } 4873b411b363SPhilipp Reisner 48741952e916SAndreas Gruenbacher static int got_NegAck(struct drbd_tconn *tconn, struct packet_info *pi) 4875b411b363SPhilipp Reisner { 48761952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4877e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4878b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 48792deb8336SPhilipp Reisner int size = be32_to_cpu(p->blksize); 488085997675SAndreas Gruenbacher int err; 4881b411b363SPhilipp Reisner 48821952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 48831952e916SAndreas Gruenbacher if (!mdev) 48842735a594SAndreas Gruenbacher return -EIO; 48851952e916SAndreas Gruenbacher 4886b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4887b411b363SPhilipp Reisner 4888579b57edSAndreas Gruenbacher if (p->block_id == ID_SYNCER) { 4889b411b363SPhilipp Reisner dec_rs_pending(mdev); 4890b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 48912735a594SAndreas Gruenbacher return 0; 4892b411b363SPhilipp Reisner } 48932deb8336SPhilipp Reisner 489485997675SAndreas Gruenbacher err = validate_req_change_req_state(mdev, p->block_id, sector, 4895bc9c5c41SAndreas Gruenbacher &mdev->write_requests, __func__, 4896303d1448SPhilipp Reisner NEG_ACKED, true); 489785997675SAndreas Gruenbacher if (err) { 48982deb8336SPhilipp Reisner /* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs. 48992deb8336SPhilipp Reisner The master bio might already be completed, therefore the 4900c3afd8f5SAndreas Gruenbacher request is no longer in the collision hash. */ 49012deb8336SPhilipp Reisner /* In Protocol B we might already have got a P_RECV_ACK 49022deb8336SPhilipp Reisner but then get a P_NEG_ACK afterwards. */ 4903c3afd8f5SAndreas Gruenbacher drbd_set_out_of_sync(mdev, sector, size); 49042deb8336SPhilipp Reisner } 49052735a594SAndreas Gruenbacher return 0; 4906b411b363SPhilipp Reisner } 4907b411b363SPhilipp Reisner 49081952e916SAndreas Gruenbacher static int got_NegDReply(struct drbd_tconn *tconn, struct packet_info *pi) 4909b411b363SPhilipp Reisner { 49101952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4911e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4912b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4913b411b363SPhilipp Reisner 49141952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 49151952e916SAndreas Gruenbacher if (!mdev) 49162735a594SAndreas Gruenbacher return -EIO; 49171952e916SAndreas Gruenbacher 4918b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 49197be8da07SAndreas Gruenbacher 4920b411b363SPhilipp Reisner dev_err(DEV, "Got NegDReply; Sector %llus, len %u; Fail original request.\n", 4921b411b363SPhilipp Reisner (unsigned long long)sector, be32_to_cpu(p->blksize)); 4922b411b363SPhilipp Reisner 49232735a594SAndreas Gruenbacher return validate_req_change_req_state(mdev, p->block_id, sector, 4924bc9c5c41SAndreas Gruenbacher &mdev->read_requests, __func__, 49258554df1cSAndreas Gruenbacher NEG_ACKED, false); 4926b411b363SPhilipp Reisner } 4927b411b363SPhilipp Reisner 49281952e916SAndreas Gruenbacher static int got_NegRSDReply(struct drbd_tconn *tconn, struct packet_info *pi) 4929b411b363SPhilipp Reisner { 49301952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4931b411b363SPhilipp Reisner sector_t sector; 4932b411b363SPhilipp Reisner int size; 4933e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 49341952e916SAndreas Gruenbacher 49351952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 49361952e916SAndreas Gruenbacher if (!mdev) 49372735a594SAndreas Gruenbacher return -EIO; 4938b411b363SPhilipp Reisner 4939b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4940b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4941b411b363SPhilipp Reisner 4942b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4943b411b363SPhilipp Reisner 4944b411b363SPhilipp Reisner dec_rs_pending(mdev); 4945b411b363SPhilipp Reisner 4946b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_FAILED)) { 4947b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4948e05e1e59SAndreas Gruenbacher switch (pi->cmd) { 4949d612d309SPhilipp Reisner case P_NEG_RS_DREPLY: 4950b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 4951d612d309SPhilipp Reisner case P_RS_CANCEL: 4952d612d309SPhilipp Reisner break; 4953d612d309SPhilipp Reisner default: 49542735a594SAndreas Gruenbacher BUG(); 4955d612d309SPhilipp Reisner } 4956b411b363SPhilipp Reisner put_ldev(mdev); 4957b411b363SPhilipp Reisner } 4958b411b363SPhilipp Reisner 49592735a594SAndreas Gruenbacher return 0; 4960b411b363SPhilipp Reisner } 4961b411b363SPhilipp Reisner 49621952e916SAndreas Gruenbacher static int got_BarrierAck(struct drbd_tconn *tconn, struct packet_info *pi) 4963b411b363SPhilipp Reisner { 49641952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4965e658983aSAndreas Gruenbacher struct p_barrier_ack *p = pi->data; 49661952e916SAndreas Gruenbacher 49671952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 49681952e916SAndreas Gruenbacher if (!mdev) 49692735a594SAndreas Gruenbacher return -EIO; 4970b411b363SPhilipp Reisner 49712f5cdd0bSPhilipp Reisner tl_release(mdev->tconn, p->barrier, be32_to_cpu(p->set_size)); 4972b411b363SPhilipp Reisner 4973c4752ef1SPhilipp Reisner if (mdev->state.conn == C_AHEAD && 4974c4752ef1SPhilipp Reisner atomic_read(&mdev->ap_in_flight) == 0 && 4975370a43e7SPhilipp Reisner !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &mdev->current_epoch->flags)) { 4976370a43e7SPhilipp Reisner mdev->start_resync_timer.expires = jiffies + HZ; 4977370a43e7SPhilipp Reisner add_timer(&mdev->start_resync_timer); 4978c4752ef1SPhilipp Reisner } 4979c4752ef1SPhilipp Reisner 49802735a594SAndreas Gruenbacher return 0; 4981b411b363SPhilipp Reisner } 4982b411b363SPhilipp Reisner 49831952e916SAndreas Gruenbacher static int got_OVResult(struct drbd_tconn *tconn, struct packet_info *pi) 4984b411b363SPhilipp Reisner { 49851952e916SAndreas Gruenbacher struct drbd_conf *mdev; 4986e658983aSAndreas Gruenbacher struct p_block_ack *p = pi->data; 4987b411b363SPhilipp Reisner struct drbd_work *w; 4988b411b363SPhilipp Reisner sector_t sector; 4989b411b363SPhilipp Reisner int size; 4990b411b363SPhilipp Reisner 49911952e916SAndreas Gruenbacher mdev = vnr_to_mdev(tconn, pi->vnr); 49921952e916SAndreas Gruenbacher if (!mdev) 49932735a594SAndreas Gruenbacher return -EIO; 49941952e916SAndreas Gruenbacher 4995b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4996b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4997b411b363SPhilipp Reisner 4998b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4999b411b363SPhilipp Reisner 5000b411b363SPhilipp Reisner if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) 50018f7bed77SAndreas Gruenbacher drbd_ov_out_of_sync_found(mdev, sector, size); 5002b411b363SPhilipp Reisner else 50038f7bed77SAndreas Gruenbacher ov_out_of_sync_print(mdev); 5004b411b363SPhilipp Reisner 50051d53f09eSLars Ellenberg if (!get_ldev(mdev)) 50062735a594SAndreas Gruenbacher return 0; 50071d53f09eSLars Ellenberg 5008b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 5009b411b363SPhilipp Reisner dec_rs_pending(mdev); 5010b411b363SPhilipp Reisner 5011ea5442afSLars Ellenberg --mdev->ov_left; 5012ea5442afSLars Ellenberg 5013ea5442afSLars Ellenberg /* let's advance progress step marks only for every other megabyte */ 5014ea5442afSLars Ellenberg if ((mdev->ov_left & 0x200) == 0x200) 5015ea5442afSLars Ellenberg drbd_advance_rs_marks(mdev, mdev->ov_left); 5016ea5442afSLars Ellenberg 5017ea5442afSLars Ellenberg if (mdev->ov_left == 0) { 5018b411b363SPhilipp Reisner w = kmalloc(sizeof(*w), GFP_NOIO); 5019b411b363SPhilipp Reisner if (w) { 5020b411b363SPhilipp Reisner w->cb = w_ov_finished; 5021a21e9298SPhilipp Reisner w->mdev = mdev; 5022e42325a5SPhilipp Reisner drbd_queue_work_front(&mdev->tconn->data.work, w); 5023b411b363SPhilipp Reisner } else { 5024b411b363SPhilipp Reisner dev_err(DEV, "kmalloc(w) failed."); 50258f7bed77SAndreas Gruenbacher ov_out_of_sync_print(mdev); 5026b411b363SPhilipp Reisner drbd_resync_finished(mdev); 5027b411b363SPhilipp Reisner } 5028b411b363SPhilipp Reisner } 50291d53f09eSLars Ellenberg put_ldev(mdev); 50302735a594SAndreas Gruenbacher return 0; 5031b411b363SPhilipp Reisner } 5032b411b363SPhilipp Reisner 50331952e916SAndreas Gruenbacher static int got_skip(struct drbd_tconn *tconn, struct packet_info *pi) 50340ced55a3SPhilipp Reisner { 50352735a594SAndreas Gruenbacher return 0; 50360ced55a3SPhilipp Reisner } 50370ced55a3SPhilipp Reisner 5038a990be46SAndreas Gruenbacher static int tconn_finish_peer_reqs(struct drbd_tconn *tconn) 503932862ec7SPhilipp Reisner { 5040082a3439SPhilipp Reisner struct drbd_conf *mdev; 5041c141ebdaSPhilipp Reisner int vnr, not_empty = 0; 504232862ec7SPhilipp Reisner 504332862ec7SPhilipp Reisner do { 504432862ec7SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &tconn->flags); 504532862ec7SPhilipp Reisner flush_signals(current); 5046c141ebdaSPhilipp Reisner 5047c141ebdaSPhilipp Reisner rcu_read_lock(); 5048c141ebdaSPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, vnr) { 5049c141ebdaSPhilipp Reisner kref_get(&mdev->kref); 5050c141ebdaSPhilipp Reisner rcu_read_unlock(); 5051d3fcb490SPhilipp Reisner if (drbd_finish_peer_reqs(mdev)) { 5052c141ebdaSPhilipp Reisner kref_put(&mdev->kref, &drbd_minor_destroy); 5053c141ebdaSPhilipp Reisner return 1; 5054082a3439SPhilipp Reisner } 5055c141ebdaSPhilipp Reisner kref_put(&mdev->kref, &drbd_minor_destroy); 5056c141ebdaSPhilipp Reisner rcu_read_lock(); 5057d3fcb490SPhilipp Reisner } 505832862ec7SPhilipp Reisner set_bit(SIGNAL_ASENDER, &tconn->flags); 5059082a3439SPhilipp Reisner 5060082a3439SPhilipp Reisner spin_lock_irq(&tconn->req_lock); 5061c141ebdaSPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, vnr) { 5062082a3439SPhilipp Reisner not_empty = !list_empty(&mdev->done_ee); 5063082a3439SPhilipp Reisner if (not_empty) 5064082a3439SPhilipp Reisner break; 5065082a3439SPhilipp Reisner } 5066082a3439SPhilipp Reisner spin_unlock_irq(&tconn->req_lock); 5067c141ebdaSPhilipp Reisner rcu_read_unlock(); 506832862ec7SPhilipp Reisner } while (not_empty); 506932862ec7SPhilipp Reisner 507032862ec7SPhilipp Reisner return 0; 507132862ec7SPhilipp Reisner } 507232862ec7SPhilipp Reisner 50737201b972SAndreas Gruenbacher struct asender_cmd { 50747201b972SAndreas Gruenbacher size_t pkt_size; 50751952e916SAndreas Gruenbacher int (*fn)(struct drbd_tconn *tconn, struct packet_info *); 50767201b972SAndreas Gruenbacher }; 50777201b972SAndreas Gruenbacher 50787201b972SAndreas Gruenbacher static struct asender_cmd asender_tbl[] = { 5079e658983aSAndreas Gruenbacher [P_PING] = { 0, got_Ping }, 5080e658983aSAndreas Gruenbacher [P_PING_ACK] = { 0, got_PingAck }, 50811952e916SAndreas Gruenbacher [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 50821952e916SAndreas Gruenbacher [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 50831952e916SAndreas Gruenbacher [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 50841952e916SAndreas Gruenbacher [P_DISCARD_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, 50851952e916SAndreas Gruenbacher [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, 50861952e916SAndreas Gruenbacher [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, 50871952e916SAndreas Gruenbacher [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply }, 50881952e916SAndreas Gruenbacher [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, 50891952e916SAndreas Gruenbacher [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, 50901952e916SAndreas Gruenbacher [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, 50911952e916SAndreas Gruenbacher [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, 50921952e916SAndreas Gruenbacher [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip }, 50931952e916SAndreas Gruenbacher [P_RS_CANCEL] = { sizeof(struct p_block_ack), got_NegRSDReply }, 50941952e916SAndreas Gruenbacher [P_CONN_ST_CHG_REPLY]={ sizeof(struct p_req_state_reply), got_conn_RqSReply }, 50951952e916SAndreas Gruenbacher [P_RETRY_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, 50967201b972SAndreas Gruenbacher }; 50977201b972SAndreas Gruenbacher 5098b411b363SPhilipp Reisner int drbd_asender(struct drbd_thread *thi) 5099b411b363SPhilipp Reisner { 5100392c8801SPhilipp Reisner struct drbd_tconn *tconn = thi->tconn; 5101b411b363SPhilipp Reisner struct asender_cmd *cmd = NULL; 510277351055SPhilipp Reisner struct packet_info pi; 5103257d0af6SPhilipp Reisner int rv; 5104e658983aSAndreas Gruenbacher void *buf = tconn->meta.rbuf; 5105b411b363SPhilipp Reisner int received = 0; 510652b061a4SAndreas Gruenbacher unsigned int header_size = drbd_header_size(tconn); 510752b061a4SAndreas Gruenbacher int expect = header_size; 510844ed167dSPhilipp Reisner bool ping_timeout_active = false; 510944ed167dSPhilipp Reisner struct net_conf *nc; 5110bb77d34eSAndreas Gruenbacher int ping_timeo, tcp_cork, ping_int; 5111b411b363SPhilipp Reisner 5112b411b363SPhilipp Reisner current->policy = SCHED_RR; /* Make this a realtime task! */ 5113b411b363SPhilipp Reisner current->rt_priority = 2; /* more important than all other tasks */ 5114b411b363SPhilipp Reisner 5115e77a0a5cSAndreas Gruenbacher while (get_t_state(thi) == RUNNING) { 511680822284SPhilipp Reisner drbd_thread_current_set_cpu(thi); 511744ed167dSPhilipp Reisner 511844ed167dSPhilipp Reisner rcu_read_lock(); 511944ed167dSPhilipp Reisner nc = rcu_dereference(tconn->net_conf); 512044ed167dSPhilipp Reisner ping_timeo = nc->ping_timeo; 5121bb77d34eSAndreas Gruenbacher tcp_cork = nc->tcp_cork; 512244ed167dSPhilipp Reisner ping_int = nc->ping_int; 512344ed167dSPhilipp Reisner rcu_read_unlock(); 512444ed167dSPhilipp Reisner 512532862ec7SPhilipp Reisner if (test_and_clear_bit(SEND_PING, &tconn->flags)) { 5126a17647aaSAndreas Gruenbacher if (drbd_send_ping(tconn)) { 512732862ec7SPhilipp Reisner conn_err(tconn, "drbd_send_ping has failed\n"); 5128841ce241SAndreas Gruenbacher goto reconnect; 5129841ce241SAndreas Gruenbacher } 513044ed167dSPhilipp Reisner tconn->meta.socket->sk->sk_rcvtimeo = ping_timeo * HZ / 10; 513144ed167dSPhilipp Reisner ping_timeout_active = true; 5132b411b363SPhilipp Reisner } 5133b411b363SPhilipp Reisner 513432862ec7SPhilipp Reisner /* TODO: conditionally cork; it may hurt latency if we cork without 513532862ec7SPhilipp Reisner much to send */ 5136bb77d34eSAndreas Gruenbacher if (tcp_cork) 513732862ec7SPhilipp Reisner drbd_tcp_cork(tconn->meta.socket); 5138a990be46SAndreas Gruenbacher if (tconn_finish_peer_reqs(tconn)) { 5139a990be46SAndreas Gruenbacher conn_err(tconn, "tconn_finish_peer_reqs() failed\n"); 5140b411b363SPhilipp Reisner goto reconnect; 5141082a3439SPhilipp Reisner } 5142b411b363SPhilipp Reisner /* but unconditionally uncork unless disabled */ 5143bb77d34eSAndreas Gruenbacher if (tcp_cork) 514432862ec7SPhilipp Reisner drbd_tcp_uncork(tconn->meta.socket); 5145b411b363SPhilipp Reisner 5146b411b363SPhilipp Reisner /* short circuit, recv_msg would return EINTR anyways. */ 5147b411b363SPhilipp Reisner if (signal_pending(current)) 5148b411b363SPhilipp Reisner continue; 5149b411b363SPhilipp Reisner 515032862ec7SPhilipp Reisner rv = drbd_recv_short(tconn->meta.socket, buf, expect-received, 0); 515132862ec7SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &tconn->flags); 5152b411b363SPhilipp Reisner 5153b411b363SPhilipp Reisner flush_signals(current); 5154b411b363SPhilipp Reisner 5155b411b363SPhilipp Reisner /* Note: 5156b411b363SPhilipp Reisner * -EINTR (on meta) we got a signal 5157b411b363SPhilipp Reisner * -EAGAIN (on meta) rcvtimeo expired 5158b411b363SPhilipp Reisner * -ECONNRESET other side closed the connection 5159b411b363SPhilipp Reisner * -ERESTARTSYS (on data) we got a signal 5160b411b363SPhilipp Reisner * rv < 0 other than above: unexpected error! 5161b411b363SPhilipp Reisner * rv == expected: full header or command 5162b411b363SPhilipp Reisner * rv < expected: "woken" by signal during receive 5163b411b363SPhilipp Reisner * rv == 0 : "connection shut down by peer" 5164b411b363SPhilipp Reisner */ 5165b411b363SPhilipp Reisner if (likely(rv > 0)) { 5166b411b363SPhilipp Reisner received += rv; 5167b411b363SPhilipp Reisner buf += rv; 5168b411b363SPhilipp Reisner } else if (rv == 0) { 516932862ec7SPhilipp Reisner conn_err(tconn, "meta connection shut down by peer.\n"); 5170b411b363SPhilipp Reisner goto reconnect; 5171b411b363SPhilipp Reisner } else if (rv == -EAGAIN) { 5172cb6518cbSLars Ellenberg /* If the data socket received something meanwhile, 5173cb6518cbSLars Ellenberg * that is good enough: peer is still alive. */ 517432862ec7SPhilipp Reisner if (time_after(tconn->last_received, 517532862ec7SPhilipp Reisner jiffies - tconn->meta.socket->sk->sk_rcvtimeo)) 5176cb6518cbSLars Ellenberg continue; 5177f36af18cSLars Ellenberg if (ping_timeout_active) { 517832862ec7SPhilipp Reisner conn_err(tconn, "PingAck did not arrive in time.\n"); 5179b411b363SPhilipp Reisner goto reconnect; 5180b411b363SPhilipp Reisner } 518132862ec7SPhilipp Reisner set_bit(SEND_PING, &tconn->flags); 5182b411b363SPhilipp Reisner continue; 5183b411b363SPhilipp Reisner } else if (rv == -EINTR) { 5184b411b363SPhilipp Reisner continue; 5185b411b363SPhilipp Reisner } else { 518632862ec7SPhilipp Reisner conn_err(tconn, "sock_recvmsg returned %d\n", rv); 5187b411b363SPhilipp Reisner goto reconnect; 5188b411b363SPhilipp Reisner } 5189b411b363SPhilipp Reisner 5190b411b363SPhilipp Reisner if (received == expect && cmd == NULL) { 5191e658983aSAndreas Gruenbacher if (decode_header(tconn, tconn->meta.rbuf, &pi)) 5192b411b363SPhilipp Reisner goto reconnect; 51937201b972SAndreas Gruenbacher cmd = &asender_tbl[pi.cmd]; 51941952e916SAndreas Gruenbacher if (pi.cmd >= ARRAY_SIZE(asender_tbl) || !cmd->fn) { 519532862ec7SPhilipp Reisner conn_err(tconn, "unknown command %d on meta (l: %d)\n", 519677351055SPhilipp Reisner pi.cmd, pi.size); 5197b411b363SPhilipp Reisner goto disconnect; 5198b411b363SPhilipp Reisner } 5199e658983aSAndreas Gruenbacher expect = header_size + cmd->pkt_size; 520052b061a4SAndreas Gruenbacher if (pi.size != expect - header_size) { 520132862ec7SPhilipp Reisner conn_err(tconn, "Wrong packet size on meta (c: %d, l: %d)\n", 520277351055SPhilipp Reisner pi.cmd, pi.size); 5203b411b363SPhilipp Reisner goto reconnect; 5204b411b363SPhilipp Reisner } 5205257d0af6SPhilipp Reisner } 5206b411b363SPhilipp Reisner if (received == expect) { 52072735a594SAndreas Gruenbacher bool err; 5208a4fbda8eSPhilipp Reisner 52092735a594SAndreas Gruenbacher err = cmd->fn(tconn, &pi); 52102735a594SAndreas Gruenbacher if (err) { 52111952e916SAndreas Gruenbacher conn_err(tconn, "%pf failed\n", cmd->fn); 5212b411b363SPhilipp Reisner goto reconnect; 52131952e916SAndreas Gruenbacher } 5214b411b363SPhilipp Reisner 5215a4fbda8eSPhilipp Reisner tconn->last_received = jiffies; 5216a4fbda8eSPhilipp Reisner 521744ed167dSPhilipp Reisner if (cmd == &asender_tbl[P_PING_ACK]) { 521844ed167dSPhilipp Reisner /* restore idle timeout */ 521944ed167dSPhilipp Reisner tconn->meta.socket->sk->sk_rcvtimeo = ping_int * HZ; 522044ed167dSPhilipp Reisner ping_timeout_active = false; 522144ed167dSPhilipp Reisner } 5222f36af18cSLars Ellenberg 5223e658983aSAndreas Gruenbacher buf = tconn->meta.rbuf; 5224b411b363SPhilipp Reisner received = 0; 522552b061a4SAndreas Gruenbacher expect = header_size; 5226b411b363SPhilipp Reisner cmd = NULL; 5227b411b363SPhilipp Reisner } 5228b411b363SPhilipp Reisner } 5229b411b363SPhilipp Reisner 5230b411b363SPhilipp Reisner if (0) { 5231b411b363SPhilipp Reisner reconnect: 5232bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_NETWORK_FAILURE), CS_HARD); 5233b411b363SPhilipp Reisner } 5234b411b363SPhilipp Reisner if (0) { 5235b411b363SPhilipp Reisner disconnect: 5236bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 5237b411b363SPhilipp Reisner } 523832862ec7SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &tconn->flags); 5239b411b363SPhilipp Reisner 524032862ec7SPhilipp Reisner conn_info(tconn, "asender terminated\n"); 5241b411b363SPhilipp Reisner 5242b411b363SPhilipp Reisner return 0; 5243b411b363SPhilipp Reisner } 5244