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; 5377351055SPhilipp Reisner int size; 5477351055SPhilipp Reisner int vnr; 5577351055SPhilipp Reisner }; 5677351055SPhilipp Reisner 57b411b363SPhilipp Reisner enum finish_epoch { 58b411b363SPhilipp Reisner FE_STILL_LIVE, 59b411b363SPhilipp Reisner FE_DESTROYED, 60b411b363SPhilipp Reisner FE_RECYCLED, 61b411b363SPhilipp Reisner }; 62b411b363SPhilipp Reisner 6365d11ed6SPhilipp Reisner static int drbd_do_handshake(struct drbd_tconn *tconn); 6413e6037dSPhilipp Reisner static int drbd_do_auth(struct drbd_tconn *tconn); 65360cc740SPhilipp Reisner static int drbd_disconnected(int vnr, void *p, void *data); 66b411b363SPhilipp Reisner 67b411b363SPhilipp Reisner static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *, struct drbd_epoch *, enum epoch_event); 6800d56944SPhilipp Reisner static int e_end_block(struct drbd_work *, int); 69b411b363SPhilipp Reisner 70b411b363SPhilipp Reisner 71b411b363SPhilipp Reisner #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) 72b411b363SPhilipp Reisner 7345bb912bSLars Ellenberg /* 7445bb912bSLars Ellenberg * some helper functions to deal with single linked page lists, 7545bb912bSLars Ellenberg * page->private being our "next" pointer. 7645bb912bSLars Ellenberg */ 7745bb912bSLars Ellenberg 7845bb912bSLars Ellenberg /* If at least n pages are linked at head, get n pages off. 7945bb912bSLars Ellenberg * Otherwise, don't modify head, and return NULL. 8045bb912bSLars Ellenberg * Locking is the responsibility of the caller. 8145bb912bSLars Ellenberg */ 8245bb912bSLars Ellenberg static struct page *page_chain_del(struct page **head, int n) 8345bb912bSLars Ellenberg { 8445bb912bSLars Ellenberg struct page *page; 8545bb912bSLars Ellenberg struct page *tmp; 8645bb912bSLars Ellenberg 8745bb912bSLars Ellenberg BUG_ON(!n); 8845bb912bSLars Ellenberg BUG_ON(!head); 8945bb912bSLars Ellenberg 9045bb912bSLars Ellenberg page = *head; 9123ce4227SPhilipp Reisner 9223ce4227SPhilipp Reisner if (!page) 9323ce4227SPhilipp Reisner return NULL; 9423ce4227SPhilipp Reisner 9545bb912bSLars Ellenberg while (page) { 9645bb912bSLars Ellenberg tmp = page_chain_next(page); 9745bb912bSLars Ellenberg if (--n == 0) 9845bb912bSLars Ellenberg break; /* found sufficient pages */ 9945bb912bSLars Ellenberg if (tmp == NULL) 10045bb912bSLars Ellenberg /* insufficient pages, don't use any of them. */ 10145bb912bSLars Ellenberg return NULL; 10245bb912bSLars Ellenberg page = tmp; 10345bb912bSLars Ellenberg } 10445bb912bSLars Ellenberg 10545bb912bSLars Ellenberg /* add end of list marker for the returned list */ 10645bb912bSLars Ellenberg set_page_private(page, 0); 10745bb912bSLars Ellenberg /* actual return value, and adjustment of head */ 10845bb912bSLars Ellenberg page = *head; 10945bb912bSLars Ellenberg *head = tmp; 11045bb912bSLars Ellenberg return page; 11145bb912bSLars Ellenberg } 11245bb912bSLars Ellenberg 11345bb912bSLars Ellenberg /* may be used outside of locks to find the tail of a (usually short) 11445bb912bSLars Ellenberg * "private" page chain, before adding it back to a global chain head 11545bb912bSLars Ellenberg * with page_chain_add() under a spinlock. */ 11645bb912bSLars Ellenberg static struct page *page_chain_tail(struct page *page, int *len) 11745bb912bSLars Ellenberg { 11845bb912bSLars Ellenberg struct page *tmp; 11945bb912bSLars Ellenberg int i = 1; 12045bb912bSLars Ellenberg while ((tmp = page_chain_next(page))) 12145bb912bSLars Ellenberg ++i, page = tmp; 12245bb912bSLars Ellenberg if (len) 12345bb912bSLars Ellenberg *len = i; 12445bb912bSLars Ellenberg return page; 12545bb912bSLars Ellenberg } 12645bb912bSLars Ellenberg 12745bb912bSLars Ellenberg static int page_chain_free(struct page *page) 12845bb912bSLars Ellenberg { 12945bb912bSLars Ellenberg struct page *tmp; 13045bb912bSLars Ellenberg int i = 0; 13145bb912bSLars Ellenberg page_chain_for_each_safe(page, tmp) { 13245bb912bSLars Ellenberg put_page(page); 13345bb912bSLars Ellenberg ++i; 13445bb912bSLars Ellenberg } 13545bb912bSLars Ellenberg return i; 13645bb912bSLars Ellenberg } 13745bb912bSLars Ellenberg 13845bb912bSLars Ellenberg static void page_chain_add(struct page **head, 13945bb912bSLars Ellenberg struct page *chain_first, struct page *chain_last) 14045bb912bSLars Ellenberg { 14145bb912bSLars Ellenberg #if 1 14245bb912bSLars Ellenberg struct page *tmp; 14345bb912bSLars Ellenberg tmp = page_chain_tail(chain_first, NULL); 14445bb912bSLars Ellenberg BUG_ON(tmp != chain_last); 14545bb912bSLars Ellenberg #endif 14645bb912bSLars Ellenberg 14745bb912bSLars Ellenberg /* add chain to head */ 14845bb912bSLars Ellenberg set_page_private(chain_last, (unsigned long)*head); 14945bb912bSLars Ellenberg *head = chain_first; 15045bb912bSLars Ellenberg } 15145bb912bSLars Ellenberg 15245bb912bSLars Ellenberg static struct page *drbd_pp_first_pages_or_try_alloc(struct drbd_conf *mdev, int number) 153b411b363SPhilipp Reisner { 154b411b363SPhilipp Reisner struct page *page = NULL; 15545bb912bSLars Ellenberg struct page *tmp = NULL; 15645bb912bSLars Ellenberg int i = 0; 157b411b363SPhilipp Reisner 158b411b363SPhilipp Reisner /* Yes, testing drbd_pp_vacant outside the lock is racy. 159b411b363SPhilipp Reisner * So what. It saves a spin_lock. */ 16045bb912bSLars Ellenberg if (drbd_pp_vacant >= number) { 161b411b363SPhilipp Reisner spin_lock(&drbd_pp_lock); 16245bb912bSLars Ellenberg page = page_chain_del(&drbd_pp_pool, number); 16345bb912bSLars Ellenberg if (page) 16445bb912bSLars Ellenberg drbd_pp_vacant -= number; 165b411b363SPhilipp Reisner spin_unlock(&drbd_pp_lock); 16645bb912bSLars Ellenberg if (page) 16745bb912bSLars Ellenberg return page; 168b411b363SPhilipp Reisner } 16945bb912bSLars Ellenberg 170b411b363SPhilipp Reisner /* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD 171b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 172b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 17345bb912bSLars Ellenberg for (i = 0; i < number; i++) { 17445bb912bSLars Ellenberg tmp = alloc_page(GFP_TRY); 17545bb912bSLars Ellenberg if (!tmp) 17645bb912bSLars Ellenberg break; 17745bb912bSLars Ellenberg set_page_private(tmp, (unsigned long)page); 17845bb912bSLars Ellenberg page = tmp; 17945bb912bSLars Ellenberg } 18045bb912bSLars Ellenberg 18145bb912bSLars Ellenberg if (i == number) 182b411b363SPhilipp Reisner return page; 18345bb912bSLars Ellenberg 18445bb912bSLars Ellenberg /* Not enough pages immediately available this time. 18545bb912bSLars Ellenberg * No need to jump around here, drbd_pp_alloc will retry this 18645bb912bSLars Ellenberg * function "soon". */ 18745bb912bSLars Ellenberg if (page) { 18845bb912bSLars Ellenberg tmp = page_chain_tail(page, NULL); 18945bb912bSLars Ellenberg spin_lock(&drbd_pp_lock); 19045bb912bSLars Ellenberg page_chain_add(&drbd_pp_pool, page, tmp); 19145bb912bSLars Ellenberg drbd_pp_vacant += i; 19245bb912bSLars Ellenberg spin_unlock(&drbd_pp_lock); 19345bb912bSLars Ellenberg } 19445bb912bSLars Ellenberg return NULL; 195b411b363SPhilipp Reisner } 196b411b363SPhilipp Reisner 197b411b363SPhilipp Reisner static void reclaim_net_ee(struct drbd_conf *mdev, struct list_head *to_be_freed) 198b411b363SPhilipp Reisner { 199db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 200b411b363SPhilipp Reisner struct list_head *le, *tle; 201b411b363SPhilipp Reisner 202b411b363SPhilipp Reisner /* The EEs are always appended to the end of the list. Since 203b411b363SPhilipp Reisner they are sent in order over the wire, they have to finish 204b411b363SPhilipp Reisner in order. As soon as we see the first not finished we can 205b411b363SPhilipp Reisner stop to examine the list... */ 206b411b363SPhilipp Reisner 207b411b363SPhilipp Reisner list_for_each_safe(le, tle, &mdev->net_ee) { 208db830c46SAndreas Gruenbacher peer_req = list_entry(le, struct drbd_peer_request, w.list); 209db830c46SAndreas Gruenbacher if (drbd_ee_has_active_page(peer_req)) 210b411b363SPhilipp Reisner break; 211b411b363SPhilipp Reisner list_move(le, to_be_freed); 212b411b363SPhilipp Reisner } 213b411b363SPhilipp Reisner } 214b411b363SPhilipp Reisner 215b411b363SPhilipp Reisner static void drbd_kick_lo_and_reclaim_net(struct drbd_conf *mdev) 216b411b363SPhilipp Reisner { 217b411b363SPhilipp Reisner LIST_HEAD(reclaimed); 218db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req, *t; 219b411b363SPhilipp Reisner 22087eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 221b411b363SPhilipp Reisner reclaim_net_ee(mdev, &reclaimed); 22287eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 223b411b363SPhilipp Reisner 224db830c46SAndreas Gruenbacher list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) 225db830c46SAndreas Gruenbacher drbd_free_net_ee(mdev, peer_req); 226b411b363SPhilipp Reisner } 227b411b363SPhilipp Reisner 228b411b363SPhilipp Reisner /** 22945bb912bSLars Ellenberg * drbd_pp_alloc() - Returns @number pages, retries forever (or until signalled) 230b411b363SPhilipp Reisner * @mdev: DRBD device. 23145bb912bSLars Ellenberg * @number: number of pages requested 23245bb912bSLars Ellenberg * @retry: whether to retry, if not enough pages are available right now 233b411b363SPhilipp Reisner * 23445bb912bSLars Ellenberg * Tries to allocate number pages, first from our own page pool, then from 23545bb912bSLars Ellenberg * the kernel, unless this allocation would exceed the max_buffers setting. 23645bb912bSLars Ellenberg * Possibly retry until DRBD frees sufficient pages somewhere else. 23745bb912bSLars Ellenberg * 23845bb912bSLars Ellenberg * Returns a page chain linked via page->private. 239b411b363SPhilipp Reisner */ 24045bb912bSLars Ellenberg static struct page *drbd_pp_alloc(struct drbd_conf *mdev, unsigned number, bool retry) 241b411b363SPhilipp Reisner { 242b411b363SPhilipp Reisner struct page *page = NULL; 243b411b363SPhilipp Reisner DEFINE_WAIT(wait); 244b411b363SPhilipp Reisner 24545bb912bSLars Ellenberg /* Yes, we may run up to @number over max_buffers. If we 24645bb912bSLars Ellenberg * follow it strictly, the admin will get it wrong anyways. */ 24789e58e75SPhilipp Reisner if (atomic_read(&mdev->pp_in_use) < mdev->tconn->net_conf->max_buffers) 24845bb912bSLars Ellenberg page = drbd_pp_first_pages_or_try_alloc(mdev, number); 249b411b363SPhilipp Reisner 25045bb912bSLars Ellenberg while (page == NULL) { 251b411b363SPhilipp Reisner prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE); 252b411b363SPhilipp Reisner 253b411b363SPhilipp Reisner drbd_kick_lo_and_reclaim_net(mdev); 254b411b363SPhilipp Reisner 25589e58e75SPhilipp Reisner if (atomic_read(&mdev->pp_in_use) < mdev->tconn->net_conf->max_buffers) { 25645bb912bSLars Ellenberg page = drbd_pp_first_pages_or_try_alloc(mdev, number); 257b411b363SPhilipp Reisner if (page) 258b411b363SPhilipp Reisner break; 259b411b363SPhilipp Reisner } 260b411b363SPhilipp Reisner 261b411b363SPhilipp Reisner if (!retry) 262b411b363SPhilipp Reisner break; 263b411b363SPhilipp Reisner 264b411b363SPhilipp Reisner if (signal_pending(current)) { 265b411b363SPhilipp Reisner dev_warn(DEV, "drbd_pp_alloc interrupted!\n"); 266b411b363SPhilipp Reisner break; 267b411b363SPhilipp Reisner } 268b411b363SPhilipp Reisner 269b411b363SPhilipp Reisner schedule(); 270b411b363SPhilipp Reisner } 271b411b363SPhilipp Reisner finish_wait(&drbd_pp_wait, &wait); 272b411b363SPhilipp Reisner 27345bb912bSLars Ellenberg if (page) 27445bb912bSLars Ellenberg atomic_add(number, &mdev->pp_in_use); 275b411b363SPhilipp Reisner return page; 276b411b363SPhilipp Reisner } 277b411b363SPhilipp Reisner 278b411b363SPhilipp Reisner /* Must not be used from irq, as that may deadlock: see drbd_pp_alloc. 27987eeee41SPhilipp Reisner * Is also used from inside an other spin_lock_irq(&mdev->tconn->req_lock); 28045bb912bSLars Ellenberg * Either links the page chain back to the global pool, 28145bb912bSLars Ellenberg * or returns all pages to the system. */ 282435f0740SLars Ellenberg static void drbd_pp_free(struct drbd_conf *mdev, struct page *page, int is_net) 283b411b363SPhilipp Reisner { 284435f0740SLars Ellenberg atomic_t *a = is_net ? &mdev->pp_in_use_by_net : &mdev->pp_in_use; 285b411b363SPhilipp Reisner int i; 286435f0740SLars Ellenberg 2871816a2b4SLars Ellenberg if (drbd_pp_vacant > (DRBD_MAX_BIO_SIZE/PAGE_SIZE)*minor_count) 28845bb912bSLars Ellenberg i = page_chain_free(page); 28945bb912bSLars Ellenberg else { 29045bb912bSLars Ellenberg struct page *tmp; 29145bb912bSLars Ellenberg tmp = page_chain_tail(page, &i); 292b411b363SPhilipp Reisner spin_lock(&drbd_pp_lock); 29345bb912bSLars Ellenberg page_chain_add(&drbd_pp_pool, page, tmp); 29445bb912bSLars Ellenberg drbd_pp_vacant += i; 295b411b363SPhilipp Reisner spin_unlock(&drbd_pp_lock); 296b411b363SPhilipp Reisner } 297435f0740SLars Ellenberg i = atomic_sub_return(i, a); 29845bb912bSLars Ellenberg if (i < 0) 299435f0740SLars Ellenberg dev_warn(DEV, "ASSERTION FAILED: %s: %d < 0\n", 300435f0740SLars Ellenberg is_net ? "pp_in_use_by_net" : "pp_in_use", i); 301b411b363SPhilipp Reisner wake_up(&drbd_pp_wait); 302b411b363SPhilipp Reisner } 303b411b363SPhilipp Reisner 304b411b363SPhilipp Reisner /* 305b411b363SPhilipp Reisner You need to hold the req_lock: 306b411b363SPhilipp Reisner _drbd_wait_ee_list_empty() 307b411b363SPhilipp Reisner 308b411b363SPhilipp Reisner You must not have the req_lock: 309b411b363SPhilipp Reisner drbd_free_ee() 310b411b363SPhilipp Reisner drbd_alloc_ee() 311b411b363SPhilipp Reisner drbd_init_ee() 312b411b363SPhilipp Reisner drbd_release_ee() 313b411b363SPhilipp Reisner drbd_ee_fix_bhs() 314b411b363SPhilipp Reisner drbd_process_done_ee() 315b411b363SPhilipp Reisner drbd_clear_done_ee() 316b411b363SPhilipp Reisner drbd_wait_ee_list_empty() 317b411b363SPhilipp Reisner */ 318b411b363SPhilipp Reisner 319f6ffca9fSAndreas Gruenbacher struct drbd_peer_request * 320f6ffca9fSAndreas Gruenbacher drbd_alloc_ee(struct drbd_conf *mdev, u64 id, sector_t sector, 321f6ffca9fSAndreas Gruenbacher unsigned int data_size, gfp_t gfp_mask) __must_hold(local) 322b411b363SPhilipp Reisner { 323db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 324b411b363SPhilipp Reisner struct page *page; 32545bb912bSLars Ellenberg unsigned nr_pages = (data_size + PAGE_SIZE -1) >> PAGE_SHIFT; 326b411b363SPhilipp Reisner 3270cf9d27eSAndreas Gruenbacher if (drbd_insert_fault(mdev, DRBD_FAULT_AL_EE)) 328b411b363SPhilipp Reisner return NULL; 329b411b363SPhilipp Reisner 330db830c46SAndreas Gruenbacher peer_req = mempool_alloc(drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM); 331db830c46SAndreas Gruenbacher if (!peer_req) { 332b411b363SPhilipp Reisner if (!(gfp_mask & __GFP_NOWARN)) 333b411b363SPhilipp Reisner dev_err(DEV, "alloc_ee: Allocation of an EE failed\n"); 334b411b363SPhilipp Reisner return NULL; 335b411b363SPhilipp Reisner } 336b411b363SPhilipp Reisner 33745bb912bSLars Ellenberg page = drbd_pp_alloc(mdev, nr_pages, (gfp_mask & __GFP_WAIT)); 33845bb912bSLars Ellenberg if (!page) 33945bb912bSLars Ellenberg goto fail; 340b411b363SPhilipp Reisner 341db830c46SAndreas Gruenbacher drbd_clear_interval(&peer_req->i); 342db830c46SAndreas Gruenbacher peer_req->i.size = data_size; 343db830c46SAndreas Gruenbacher peer_req->i.sector = sector; 344db830c46SAndreas Gruenbacher peer_req->i.local = false; 345db830c46SAndreas Gruenbacher peer_req->i.waiting = false; 34653840641SAndreas Gruenbacher 347db830c46SAndreas Gruenbacher peer_req->epoch = NULL; 348a21e9298SPhilipp Reisner peer_req->w.mdev = mdev; 349db830c46SAndreas Gruenbacher peer_req->pages = page; 350db830c46SAndreas Gruenbacher atomic_set(&peer_req->pending_bios, 0); 351db830c46SAndreas Gruenbacher peer_req->flags = 0; 3529a8e7753SAndreas Gruenbacher /* 3539a8e7753SAndreas Gruenbacher * The block_id is opaque to the receiver. It is not endianness 3549a8e7753SAndreas Gruenbacher * converted, and sent back to the sender unchanged. 3559a8e7753SAndreas Gruenbacher */ 356db830c46SAndreas Gruenbacher peer_req->block_id = id; 357b411b363SPhilipp Reisner 358db830c46SAndreas Gruenbacher return peer_req; 359b411b363SPhilipp Reisner 36045bb912bSLars Ellenberg fail: 361db830c46SAndreas Gruenbacher mempool_free(peer_req, drbd_ee_mempool); 362b411b363SPhilipp Reisner return NULL; 363b411b363SPhilipp Reisner } 364b411b363SPhilipp Reisner 365db830c46SAndreas Gruenbacher void drbd_free_some_ee(struct drbd_conf *mdev, struct drbd_peer_request *peer_req, 366f6ffca9fSAndreas Gruenbacher int is_net) 367b411b363SPhilipp Reisner { 368db830c46SAndreas Gruenbacher if (peer_req->flags & EE_HAS_DIGEST) 369db830c46SAndreas Gruenbacher kfree(peer_req->digest); 370db830c46SAndreas Gruenbacher drbd_pp_free(mdev, peer_req->pages, is_net); 371db830c46SAndreas Gruenbacher D_ASSERT(atomic_read(&peer_req->pending_bios) == 0); 372db830c46SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&peer_req->i)); 373db830c46SAndreas Gruenbacher mempool_free(peer_req, drbd_ee_mempool); 374b411b363SPhilipp Reisner } 375b411b363SPhilipp Reisner 376b411b363SPhilipp Reisner int drbd_release_ee(struct drbd_conf *mdev, struct list_head *list) 377b411b363SPhilipp Reisner { 378b411b363SPhilipp Reisner LIST_HEAD(work_list); 379db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req, *t; 380b411b363SPhilipp Reisner int count = 0; 381435f0740SLars Ellenberg int is_net = list == &mdev->net_ee; 382b411b363SPhilipp Reisner 38387eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 384b411b363SPhilipp Reisner list_splice_init(list, &work_list); 38587eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 386b411b363SPhilipp Reisner 387db830c46SAndreas Gruenbacher list_for_each_entry_safe(peer_req, t, &work_list, w.list) { 388db830c46SAndreas Gruenbacher drbd_free_some_ee(mdev, peer_req, is_net); 389b411b363SPhilipp Reisner count++; 390b411b363SPhilipp Reisner } 391b411b363SPhilipp Reisner return count; 392b411b363SPhilipp Reisner } 393b411b363SPhilipp Reisner 394b411b363SPhilipp Reisner 39532862ec7SPhilipp Reisner /* See also comments in _req_mod(,BARRIER_ACKED) 396b411b363SPhilipp Reisner * and receive_Barrier. 397b411b363SPhilipp Reisner * 398b411b363SPhilipp Reisner * Move entries from net_ee to done_ee, if ready. 399b411b363SPhilipp Reisner * Grab done_ee, call all callbacks, free the entries. 400b411b363SPhilipp Reisner * The callbacks typically send out ACKs. 401b411b363SPhilipp Reisner */ 402b411b363SPhilipp Reisner static int drbd_process_done_ee(struct drbd_conf *mdev) 403b411b363SPhilipp Reisner { 404b411b363SPhilipp Reisner LIST_HEAD(work_list); 405b411b363SPhilipp Reisner LIST_HEAD(reclaimed); 406db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req, *t; 407b411b363SPhilipp Reisner int ok = (mdev->state.conn >= C_WF_REPORT_PARAMS); 408b411b363SPhilipp Reisner 40987eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 410b411b363SPhilipp Reisner reclaim_net_ee(mdev, &reclaimed); 411b411b363SPhilipp Reisner list_splice_init(&mdev->done_ee, &work_list); 41287eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 413b411b363SPhilipp Reisner 414db830c46SAndreas Gruenbacher list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) 415db830c46SAndreas Gruenbacher drbd_free_net_ee(mdev, peer_req); 416b411b363SPhilipp Reisner 417b411b363SPhilipp Reisner /* possible callbacks here: 418b411b363SPhilipp Reisner * e_end_block, and e_end_resync_block, e_send_discard_ack. 419b411b363SPhilipp Reisner * all ignore the last argument. 420b411b363SPhilipp Reisner */ 421db830c46SAndreas Gruenbacher list_for_each_entry_safe(peer_req, t, &work_list, w.list) { 422b411b363SPhilipp Reisner /* list_del not necessary, next/prev members not touched */ 42300d56944SPhilipp Reisner ok = peer_req->w.cb(&peer_req->w, !ok) && ok; 424db830c46SAndreas Gruenbacher drbd_free_ee(mdev, peer_req); 425b411b363SPhilipp Reisner } 426b411b363SPhilipp Reisner wake_up(&mdev->ee_wait); 427b411b363SPhilipp Reisner 428b411b363SPhilipp Reisner return ok; 429b411b363SPhilipp Reisner } 430b411b363SPhilipp Reisner 431b411b363SPhilipp Reisner void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head) 432b411b363SPhilipp Reisner { 433b411b363SPhilipp Reisner DEFINE_WAIT(wait); 434b411b363SPhilipp Reisner 435b411b363SPhilipp Reisner /* avoids spin_lock/unlock 436b411b363SPhilipp Reisner * and calling prepare_to_wait in the fast path */ 437b411b363SPhilipp Reisner while (!list_empty(head)) { 438b411b363SPhilipp Reisner prepare_to_wait(&mdev->ee_wait, &wait, TASK_UNINTERRUPTIBLE); 43987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 4407eaceaccSJens Axboe io_schedule(); 441b411b363SPhilipp Reisner finish_wait(&mdev->ee_wait, &wait); 44287eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 443b411b363SPhilipp Reisner } 444b411b363SPhilipp Reisner } 445b411b363SPhilipp Reisner 446b411b363SPhilipp Reisner void drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head) 447b411b363SPhilipp Reisner { 44887eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 449b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, head); 45087eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 451b411b363SPhilipp Reisner } 452b411b363SPhilipp Reisner 453b411b363SPhilipp Reisner /* see also kernel_accept; which is only present since 2.6.18. 454b411b363SPhilipp Reisner * also we want to log which part of it failed, exactly */ 4557653620dSPhilipp Reisner static int drbd_accept(const char **what, struct socket *sock, struct socket **newsock) 456b411b363SPhilipp Reisner { 457b411b363SPhilipp Reisner struct sock *sk = sock->sk; 458b411b363SPhilipp Reisner int err = 0; 459b411b363SPhilipp Reisner 460b411b363SPhilipp Reisner *what = "listen"; 461b411b363SPhilipp Reisner err = sock->ops->listen(sock, 5); 462b411b363SPhilipp Reisner if (err < 0) 463b411b363SPhilipp Reisner goto out; 464b411b363SPhilipp Reisner 465b411b363SPhilipp Reisner *what = "sock_create_lite"; 466b411b363SPhilipp Reisner err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, 467b411b363SPhilipp Reisner newsock); 468b411b363SPhilipp Reisner if (err < 0) 469b411b363SPhilipp Reisner goto out; 470b411b363SPhilipp Reisner 471b411b363SPhilipp Reisner *what = "accept"; 472b411b363SPhilipp Reisner err = sock->ops->accept(sock, *newsock, 0); 473b411b363SPhilipp Reisner if (err < 0) { 474b411b363SPhilipp Reisner sock_release(*newsock); 475b411b363SPhilipp Reisner *newsock = NULL; 476b411b363SPhilipp Reisner goto out; 477b411b363SPhilipp Reisner } 478b411b363SPhilipp Reisner (*newsock)->ops = sock->ops; 479b411b363SPhilipp Reisner 480b411b363SPhilipp Reisner out: 481b411b363SPhilipp Reisner return err; 482b411b363SPhilipp Reisner } 483b411b363SPhilipp Reisner 484dbd9eea0SPhilipp Reisner static int drbd_recv_short(struct socket *sock, void *buf, size_t size, int flags) 485b411b363SPhilipp Reisner { 486b411b363SPhilipp Reisner mm_segment_t oldfs; 487b411b363SPhilipp Reisner struct kvec iov = { 488b411b363SPhilipp Reisner .iov_base = buf, 489b411b363SPhilipp Reisner .iov_len = size, 490b411b363SPhilipp Reisner }; 491b411b363SPhilipp Reisner struct msghdr msg = { 492b411b363SPhilipp Reisner .msg_iovlen = 1, 493b411b363SPhilipp Reisner .msg_iov = (struct iovec *)&iov, 494b411b363SPhilipp Reisner .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) 495b411b363SPhilipp Reisner }; 496b411b363SPhilipp Reisner int rv; 497b411b363SPhilipp Reisner 498b411b363SPhilipp Reisner oldfs = get_fs(); 499b411b363SPhilipp Reisner set_fs(KERNEL_DS); 500b411b363SPhilipp Reisner rv = sock_recvmsg(sock, &msg, size, msg.msg_flags); 501b411b363SPhilipp Reisner set_fs(oldfs); 502b411b363SPhilipp Reisner 503b411b363SPhilipp Reisner return rv; 504b411b363SPhilipp Reisner } 505b411b363SPhilipp Reisner 506de0ff338SPhilipp Reisner static int drbd_recv(struct drbd_tconn *tconn, void *buf, size_t size) 507b411b363SPhilipp Reisner { 508b411b363SPhilipp Reisner mm_segment_t oldfs; 509b411b363SPhilipp Reisner struct kvec iov = { 510b411b363SPhilipp Reisner .iov_base = buf, 511b411b363SPhilipp Reisner .iov_len = size, 512b411b363SPhilipp Reisner }; 513b411b363SPhilipp Reisner struct msghdr msg = { 514b411b363SPhilipp Reisner .msg_iovlen = 1, 515b411b363SPhilipp Reisner .msg_iov = (struct iovec *)&iov, 516b411b363SPhilipp Reisner .msg_flags = MSG_WAITALL | MSG_NOSIGNAL 517b411b363SPhilipp Reisner }; 518b411b363SPhilipp Reisner int rv; 519b411b363SPhilipp Reisner 520b411b363SPhilipp Reisner oldfs = get_fs(); 521b411b363SPhilipp Reisner set_fs(KERNEL_DS); 522b411b363SPhilipp Reisner 523b411b363SPhilipp Reisner for (;;) { 524de0ff338SPhilipp Reisner rv = sock_recvmsg(tconn->data.socket, &msg, size, msg.msg_flags); 525b411b363SPhilipp Reisner if (rv == size) 526b411b363SPhilipp Reisner break; 527b411b363SPhilipp Reisner 528b411b363SPhilipp Reisner /* Note: 529b411b363SPhilipp Reisner * ECONNRESET other side closed the connection 530b411b363SPhilipp Reisner * ERESTARTSYS (on sock) we got a signal 531b411b363SPhilipp Reisner */ 532b411b363SPhilipp Reisner 533b411b363SPhilipp Reisner if (rv < 0) { 534b411b363SPhilipp Reisner if (rv == -ECONNRESET) 535de0ff338SPhilipp Reisner conn_info(tconn, "sock was reset by peer\n"); 536b411b363SPhilipp Reisner else if (rv != -ERESTARTSYS) 537de0ff338SPhilipp Reisner conn_err(tconn, "sock_recvmsg returned %d\n", rv); 538b411b363SPhilipp Reisner break; 539b411b363SPhilipp Reisner } else if (rv == 0) { 540de0ff338SPhilipp Reisner conn_info(tconn, "sock was shut down by peer\n"); 541b411b363SPhilipp Reisner break; 542b411b363SPhilipp Reisner } else { 543b411b363SPhilipp Reisner /* signal came in, or peer/link went down, 544b411b363SPhilipp Reisner * after we read a partial message 545b411b363SPhilipp Reisner */ 546b411b363SPhilipp Reisner /* D_ASSERT(signal_pending(current)); */ 547b411b363SPhilipp Reisner break; 548b411b363SPhilipp Reisner } 549b411b363SPhilipp Reisner }; 550b411b363SPhilipp Reisner 551b411b363SPhilipp Reisner set_fs(oldfs); 552b411b363SPhilipp Reisner 553b411b363SPhilipp Reisner if (rv != size) 554bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_BROKEN_PIPE), CS_HARD); 555b411b363SPhilipp Reisner 556b411b363SPhilipp Reisner return rv; 557b411b363SPhilipp Reisner } 558b411b363SPhilipp Reisner 5595dbf1673SLars Ellenberg /* quoting tcp(7): 5605dbf1673SLars Ellenberg * On individual connections, the socket buffer size must be set prior to the 5615dbf1673SLars Ellenberg * listen(2) or connect(2) calls in order to have it take effect. 5625dbf1673SLars Ellenberg * This is our wrapper to do so. 5635dbf1673SLars Ellenberg */ 5645dbf1673SLars Ellenberg static void drbd_setbufsize(struct socket *sock, unsigned int snd, 5655dbf1673SLars Ellenberg unsigned int rcv) 5665dbf1673SLars Ellenberg { 5675dbf1673SLars Ellenberg /* open coded SO_SNDBUF, SO_RCVBUF */ 5685dbf1673SLars Ellenberg if (snd) { 5695dbf1673SLars Ellenberg sock->sk->sk_sndbuf = snd; 5705dbf1673SLars Ellenberg sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 5715dbf1673SLars Ellenberg } 5725dbf1673SLars Ellenberg if (rcv) { 5735dbf1673SLars Ellenberg sock->sk->sk_rcvbuf = rcv; 5745dbf1673SLars Ellenberg sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 5755dbf1673SLars Ellenberg } 5765dbf1673SLars Ellenberg } 5775dbf1673SLars Ellenberg 578eac3e990SPhilipp Reisner static struct socket *drbd_try_connect(struct drbd_tconn *tconn) 579b411b363SPhilipp Reisner { 580b411b363SPhilipp Reisner const char *what; 581b411b363SPhilipp Reisner struct socket *sock; 582b411b363SPhilipp Reisner struct sockaddr_in6 src_in6; 583b411b363SPhilipp Reisner int err; 584b411b363SPhilipp Reisner int disconnect_on_error = 1; 585b411b363SPhilipp Reisner 586eac3e990SPhilipp Reisner if (!get_net_conf(tconn)) 587b411b363SPhilipp Reisner return NULL; 588b411b363SPhilipp Reisner 589b411b363SPhilipp Reisner what = "sock_create_kern"; 590eac3e990SPhilipp Reisner err = sock_create_kern(((struct sockaddr *)tconn->net_conf->my_addr)->sa_family, 591b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &sock); 592b411b363SPhilipp Reisner if (err < 0) { 593b411b363SPhilipp Reisner sock = NULL; 594b411b363SPhilipp Reisner goto out; 595b411b363SPhilipp Reisner } 596b411b363SPhilipp Reisner 597b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = 598eac3e990SPhilipp Reisner sock->sk->sk_sndtimeo = tconn->net_conf->try_connect_int*HZ; 599eac3e990SPhilipp Reisner drbd_setbufsize(sock, tconn->net_conf->sndbuf_size, 600eac3e990SPhilipp Reisner tconn->net_conf->rcvbuf_size); 601b411b363SPhilipp Reisner 602b411b363SPhilipp Reisner /* explicitly bind to the configured IP as source IP 603b411b363SPhilipp Reisner * for the outgoing connections. 604b411b363SPhilipp Reisner * This is needed for multihomed hosts and to be 605b411b363SPhilipp Reisner * able to use lo: interfaces for drbd. 606b411b363SPhilipp Reisner * Make sure to use 0 as port number, so linux selects 607b411b363SPhilipp Reisner * a free one dynamically. 608b411b363SPhilipp Reisner */ 609eac3e990SPhilipp Reisner memcpy(&src_in6, tconn->net_conf->my_addr, 610eac3e990SPhilipp Reisner min_t(int, tconn->net_conf->my_addr_len, sizeof(src_in6))); 611eac3e990SPhilipp Reisner if (((struct sockaddr *)tconn->net_conf->my_addr)->sa_family == AF_INET6) 612b411b363SPhilipp Reisner src_in6.sin6_port = 0; 613b411b363SPhilipp Reisner else 614b411b363SPhilipp Reisner ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ 615b411b363SPhilipp Reisner 616b411b363SPhilipp Reisner what = "bind before connect"; 617b411b363SPhilipp Reisner err = sock->ops->bind(sock, 618b411b363SPhilipp Reisner (struct sockaddr *) &src_in6, 619eac3e990SPhilipp Reisner tconn->net_conf->my_addr_len); 620b411b363SPhilipp Reisner if (err < 0) 621b411b363SPhilipp Reisner goto out; 622b411b363SPhilipp Reisner 623b411b363SPhilipp Reisner /* connect may fail, peer not yet available. 624b411b363SPhilipp Reisner * stay C_WF_CONNECTION, don't go Disconnecting! */ 625b411b363SPhilipp Reisner disconnect_on_error = 0; 626b411b363SPhilipp Reisner what = "connect"; 627b411b363SPhilipp Reisner err = sock->ops->connect(sock, 628eac3e990SPhilipp Reisner (struct sockaddr *)tconn->net_conf->peer_addr, 629eac3e990SPhilipp Reisner tconn->net_conf->peer_addr_len, 0); 630b411b363SPhilipp Reisner 631b411b363SPhilipp Reisner out: 632b411b363SPhilipp Reisner if (err < 0) { 633b411b363SPhilipp Reisner if (sock) { 634b411b363SPhilipp Reisner sock_release(sock); 635b411b363SPhilipp Reisner sock = NULL; 636b411b363SPhilipp Reisner } 637b411b363SPhilipp Reisner switch (-err) { 638b411b363SPhilipp Reisner /* timeout, busy, signal pending */ 639b411b363SPhilipp Reisner case ETIMEDOUT: case EAGAIN: case EINPROGRESS: 640b411b363SPhilipp Reisner case EINTR: case ERESTARTSYS: 641b411b363SPhilipp Reisner /* peer not (yet) available, network problem */ 642b411b363SPhilipp Reisner case ECONNREFUSED: case ENETUNREACH: 643b411b363SPhilipp Reisner case EHOSTDOWN: case EHOSTUNREACH: 644b411b363SPhilipp Reisner disconnect_on_error = 0; 645b411b363SPhilipp Reisner break; 646b411b363SPhilipp Reisner default: 647eac3e990SPhilipp Reisner conn_err(tconn, "%s failed, err = %d\n", what, err); 648b411b363SPhilipp Reisner } 649b411b363SPhilipp Reisner if (disconnect_on_error) 650bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 651b411b363SPhilipp Reisner } 652eac3e990SPhilipp Reisner put_net_conf(tconn); 653b411b363SPhilipp Reisner return sock; 654b411b363SPhilipp Reisner } 655b411b363SPhilipp Reisner 6567653620dSPhilipp Reisner static struct socket *drbd_wait_for_connect(struct drbd_tconn *tconn) 657b411b363SPhilipp Reisner { 658b411b363SPhilipp Reisner int timeo, err; 659b411b363SPhilipp Reisner struct socket *s_estab = NULL, *s_listen; 660b411b363SPhilipp Reisner const char *what; 661b411b363SPhilipp Reisner 6627653620dSPhilipp Reisner if (!get_net_conf(tconn)) 663b411b363SPhilipp Reisner return NULL; 664b411b363SPhilipp Reisner 665b411b363SPhilipp Reisner what = "sock_create_kern"; 6667653620dSPhilipp Reisner err = sock_create_kern(((struct sockaddr *)tconn->net_conf->my_addr)->sa_family, 667b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &s_listen); 668b411b363SPhilipp Reisner if (err) { 669b411b363SPhilipp Reisner s_listen = NULL; 670b411b363SPhilipp Reisner goto out; 671b411b363SPhilipp Reisner } 672b411b363SPhilipp Reisner 6737653620dSPhilipp Reisner timeo = tconn->net_conf->try_connect_int * HZ; 674b411b363SPhilipp Reisner timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */ 675b411b363SPhilipp Reisner 676b411b363SPhilipp Reisner s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */ 677b411b363SPhilipp Reisner s_listen->sk->sk_rcvtimeo = timeo; 678b411b363SPhilipp Reisner s_listen->sk->sk_sndtimeo = timeo; 6797653620dSPhilipp Reisner drbd_setbufsize(s_listen, tconn->net_conf->sndbuf_size, 6807653620dSPhilipp Reisner tconn->net_conf->rcvbuf_size); 681b411b363SPhilipp Reisner 682b411b363SPhilipp Reisner what = "bind before listen"; 683b411b363SPhilipp Reisner err = s_listen->ops->bind(s_listen, 6847653620dSPhilipp Reisner (struct sockaddr *) tconn->net_conf->my_addr, 6857653620dSPhilipp Reisner tconn->net_conf->my_addr_len); 686b411b363SPhilipp Reisner if (err < 0) 687b411b363SPhilipp Reisner goto out; 688b411b363SPhilipp Reisner 6897653620dSPhilipp Reisner err = drbd_accept(&what, s_listen, &s_estab); 690b411b363SPhilipp Reisner 691b411b363SPhilipp Reisner out: 692b411b363SPhilipp Reisner if (s_listen) 693b411b363SPhilipp Reisner sock_release(s_listen); 694b411b363SPhilipp Reisner if (err < 0) { 695b411b363SPhilipp Reisner if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { 6967653620dSPhilipp Reisner conn_err(tconn, "%s failed, err = %d\n", what, err); 697bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 698b411b363SPhilipp Reisner } 699b411b363SPhilipp Reisner } 7007653620dSPhilipp Reisner put_net_conf(tconn); 701b411b363SPhilipp Reisner 702b411b363SPhilipp Reisner return s_estab; 703b411b363SPhilipp Reisner } 704b411b363SPhilipp Reisner 705d38e787eSPhilipp Reisner static int drbd_send_fp(struct drbd_tconn *tconn, struct socket *sock, enum drbd_packet cmd) 706b411b363SPhilipp Reisner { 707d38e787eSPhilipp Reisner struct p_header *h = &tconn->data.sbuf.header; 708b411b363SPhilipp Reisner 709d38e787eSPhilipp Reisner return _conn_send_cmd(tconn, 0, sock, cmd, h, sizeof(*h), 0); 710b411b363SPhilipp Reisner } 711b411b363SPhilipp Reisner 712a25b63f1SPhilipp Reisner static enum drbd_packet drbd_recv_fp(struct drbd_tconn *tconn, struct socket *sock) 713b411b363SPhilipp Reisner { 714a25b63f1SPhilipp Reisner struct p_header80 *h = &tconn->data.rbuf.header.h80; 715b411b363SPhilipp Reisner int rr; 716b411b363SPhilipp Reisner 717dbd9eea0SPhilipp Reisner rr = drbd_recv_short(sock, h, sizeof(*h), 0); 718b411b363SPhilipp Reisner 719ca9bc12bSAndreas Gruenbacher if (rr == sizeof(*h) && h->magic == cpu_to_be32(DRBD_MAGIC)) 720b411b363SPhilipp Reisner return be16_to_cpu(h->command); 721b411b363SPhilipp Reisner 722b411b363SPhilipp Reisner return 0xffff; 723b411b363SPhilipp Reisner } 724b411b363SPhilipp Reisner 725b411b363SPhilipp Reisner /** 726b411b363SPhilipp Reisner * drbd_socket_okay() - Free the socket if its connection is not okay 727b411b363SPhilipp Reisner * @sock: pointer to the pointer to the socket. 728b411b363SPhilipp Reisner */ 729dbd9eea0SPhilipp Reisner static int drbd_socket_okay(struct socket **sock) 730b411b363SPhilipp Reisner { 731b411b363SPhilipp Reisner int rr; 732b411b363SPhilipp Reisner char tb[4]; 733b411b363SPhilipp Reisner 734b411b363SPhilipp Reisner if (!*sock) 73581e84650SAndreas Gruenbacher return false; 736b411b363SPhilipp Reisner 737dbd9eea0SPhilipp Reisner rr = drbd_recv_short(*sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); 738b411b363SPhilipp Reisner 739b411b363SPhilipp Reisner if (rr > 0 || rr == -EAGAIN) { 74081e84650SAndreas Gruenbacher return true; 741b411b363SPhilipp Reisner } else { 742b411b363SPhilipp Reisner sock_release(*sock); 743b411b363SPhilipp Reisner *sock = NULL; 74481e84650SAndreas Gruenbacher return false; 745b411b363SPhilipp Reisner } 746b411b363SPhilipp Reisner } 747b411b363SPhilipp Reisner 748907599e0SPhilipp Reisner static int drbd_connected(int vnr, void *p, void *data) 749907599e0SPhilipp Reisner { 750907599e0SPhilipp Reisner struct drbd_conf *mdev = (struct drbd_conf *)p; 751907599e0SPhilipp Reisner int ok = 1; 752907599e0SPhilipp Reisner 753907599e0SPhilipp Reisner atomic_set(&mdev->packet_seq, 0); 754907599e0SPhilipp Reisner mdev->peer_seq = 0; 755907599e0SPhilipp Reisner 756907599e0SPhilipp Reisner ok &= drbd_send_sync_param(mdev, &mdev->sync_conf); 757907599e0SPhilipp Reisner ok &= drbd_send_sizes(mdev, 0, 0); 758907599e0SPhilipp Reisner ok &= drbd_send_uuids(mdev); 759907599e0SPhilipp Reisner ok &= drbd_send_state(mdev); 760907599e0SPhilipp Reisner clear_bit(USE_DEGR_WFC_T, &mdev->flags); 761907599e0SPhilipp Reisner clear_bit(RESIZE_PENDING, &mdev->flags); 762907599e0SPhilipp Reisner 763907599e0SPhilipp Reisner return !ok; 764907599e0SPhilipp Reisner } 765907599e0SPhilipp Reisner 766b411b363SPhilipp Reisner /* 767b411b363SPhilipp Reisner * return values: 768b411b363SPhilipp Reisner * 1 yes, we have a valid connection 769b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 770b411b363SPhilipp Reisner * -1 peer talks different language, 771b411b363SPhilipp Reisner * no point in trying again, please go standalone. 772b411b363SPhilipp Reisner * -2 We do not have a network config... 773b411b363SPhilipp Reisner */ 774907599e0SPhilipp Reisner static int drbd_connect(struct drbd_tconn *tconn) 775b411b363SPhilipp Reisner { 776b411b363SPhilipp Reisner struct socket *s, *sock, *msock; 777b411b363SPhilipp Reisner int try, h, ok; 778b411b363SPhilipp Reisner 779bbeb641cSPhilipp Reisner if (conn_request_state(tconn, NS(conn, C_WF_CONNECTION), CS_VERBOSE) < SS_SUCCESS) 780b411b363SPhilipp Reisner return -2; 781b411b363SPhilipp Reisner 782907599e0SPhilipp Reisner clear_bit(DISCARD_CONCURRENT, &tconn->flags); 783907599e0SPhilipp Reisner tconn->agreed_pro_version = 99; 784fd340c12SPhilipp Reisner /* agreed_pro_version must be smaller than 100 so we send the old 785fd340c12SPhilipp Reisner header (h80) in the first packet and in the handshake packet. */ 786b411b363SPhilipp Reisner 787b411b363SPhilipp Reisner sock = NULL; 788b411b363SPhilipp Reisner msock = NULL; 789b411b363SPhilipp Reisner 790b411b363SPhilipp Reisner do { 791b411b363SPhilipp Reisner for (try = 0;;) { 792b411b363SPhilipp Reisner /* 3 tries, this should take less than a second! */ 793907599e0SPhilipp Reisner s = drbd_try_connect(tconn); 794b411b363SPhilipp Reisner if (s || ++try >= 3) 795b411b363SPhilipp Reisner break; 796b411b363SPhilipp Reisner /* give the other side time to call bind() & listen() */ 79720ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ / 10); 798b411b363SPhilipp Reisner } 799b411b363SPhilipp Reisner 800b411b363SPhilipp Reisner if (s) { 801b411b363SPhilipp Reisner if (!sock) { 802907599e0SPhilipp Reisner drbd_send_fp(tconn, s, P_HAND_SHAKE_S); 803b411b363SPhilipp Reisner sock = s; 804b411b363SPhilipp Reisner s = NULL; 805b411b363SPhilipp Reisner } else if (!msock) { 806907599e0SPhilipp Reisner drbd_send_fp(tconn, s, P_HAND_SHAKE_M); 807b411b363SPhilipp Reisner msock = s; 808b411b363SPhilipp Reisner s = NULL; 809b411b363SPhilipp Reisner } else { 810907599e0SPhilipp Reisner conn_err(tconn, "Logic error in drbd_connect()\n"); 811b411b363SPhilipp Reisner goto out_release_sockets; 812b411b363SPhilipp Reisner } 813b411b363SPhilipp Reisner } 814b411b363SPhilipp Reisner 815b411b363SPhilipp Reisner if (sock && msock) { 816907599e0SPhilipp Reisner schedule_timeout_interruptible(tconn->net_conf->ping_timeo*HZ/10); 817dbd9eea0SPhilipp Reisner ok = drbd_socket_okay(&sock); 818dbd9eea0SPhilipp Reisner ok = drbd_socket_okay(&msock) && ok; 819b411b363SPhilipp Reisner if (ok) 820b411b363SPhilipp Reisner break; 821b411b363SPhilipp Reisner } 822b411b363SPhilipp Reisner 823b411b363SPhilipp Reisner retry: 824907599e0SPhilipp Reisner s = drbd_wait_for_connect(tconn); 825b411b363SPhilipp Reisner if (s) { 826907599e0SPhilipp Reisner try = drbd_recv_fp(tconn, s); 827dbd9eea0SPhilipp Reisner drbd_socket_okay(&sock); 828dbd9eea0SPhilipp Reisner drbd_socket_okay(&msock); 829b411b363SPhilipp Reisner switch (try) { 830b411b363SPhilipp Reisner case P_HAND_SHAKE_S: 831b411b363SPhilipp Reisner if (sock) { 832907599e0SPhilipp Reisner conn_warn(tconn, "initial packet S crossed\n"); 833b411b363SPhilipp Reisner sock_release(sock); 834b411b363SPhilipp Reisner } 835b411b363SPhilipp Reisner sock = s; 836b411b363SPhilipp Reisner break; 837b411b363SPhilipp Reisner case P_HAND_SHAKE_M: 838b411b363SPhilipp Reisner if (msock) { 839907599e0SPhilipp Reisner conn_warn(tconn, "initial packet M crossed\n"); 840b411b363SPhilipp Reisner sock_release(msock); 841b411b363SPhilipp Reisner } 842b411b363SPhilipp Reisner msock = s; 843907599e0SPhilipp Reisner set_bit(DISCARD_CONCURRENT, &tconn->flags); 844b411b363SPhilipp Reisner break; 845b411b363SPhilipp Reisner default: 846907599e0SPhilipp Reisner conn_warn(tconn, "Error receiving initial packet\n"); 847b411b363SPhilipp Reisner sock_release(s); 848b411b363SPhilipp Reisner if (random32() & 1) 849b411b363SPhilipp Reisner goto retry; 850b411b363SPhilipp Reisner } 851b411b363SPhilipp Reisner } 852b411b363SPhilipp Reisner 853bbeb641cSPhilipp Reisner if (tconn->cstate <= C_DISCONNECTING) 854b411b363SPhilipp Reisner goto out_release_sockets; 855b411b363SPhilipp Reisner if (signal_pending(current)) { 856b411b363SPhilipp Reisner flush_signals(current); 857b411b363SPhilipp Reisner smp_rmb(); 858907599e0SPhilipp Reisner if (get_t_state(&tconn->receiver) == EXITING) 859b411b363SPhilipp Reisner goto out_release_sockets; 860b411b363SPhilipp Reisner } 861b411b363SPhilipp Reisner 862b411b363SPhilipp Reisner if (sock && msock) { 863dbd9eea0SPhilipp Reisner ok = drbd_socket_okay(&sock); 864dbd9eea0SPhilipp Reisner ok = drbd_socket_okay(&msock) && ok; 865b411b363SPhilipp Reisner if (ok) 866b411b363SPhilipp Reisner break; 867b411b363SPhilipp Reisner } 868b411b363SPhilipp Reisner } while (1); 869b411b363SPhilipp Reisner 870b411b363SPhilipp Reisner msock->sk->sk_reuse = 1; /* SO_REUSEADDR */ 871b411b363SPhilipp Reisner sock->sk->sk_reuse = 1; /* SO_REUSEADDR */ 872b411b363SPhilipp Reisner 873b411b363SPhilipp Reisner sock->sk->sk_allocation = GFP_NOIO; 874b411b363SPhilipp Reisner msock->sk->sk_allocation = GFP_NOIO; 875b411b363SPhilipp Reisner 876b411b363SPhilipp Reisner sock->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; 877b411b363SPhilipp Reisner msock->sk->sk_priority = TC_PRIO_INTERACTIVE; 878b411b363SPhilipp Reisner 879b411b363SPhilipp Reisner /* NOT YET ... 880907599e0SPhilipp Reisner * sock->sk->sk_sndtimeo = tconn->net_conf->timeout*HZ/10; 881b411b363SPhilipp Reisner * sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 882b411b363SPhilipp Reisner * first set it to the P_HAND_SHAKE timeout, 883b411b363SPhilipp Reisner * which we set to 4x the configured ping_timeout. */ 884b411b363SPhilipp Reisner sock->sk->sk_sndtimeo = 885907599e0SPhilipp Reisner sock->sk->sk_rcvtimeo = tconn->net_conf->ping_timeo*4*HZ/10; 886b411b363SPhilipp Reisner 887907599e0SPhilipp Reisner msock->sk->sk_sndtimeo = tconn->net_conf->timeout*HZ/10; 888907599e0SPhilipp Reisner msock->sk->sk_rcvtimeo = tconn->net_conf->ping_int*HZ; 889b411b363SPhilipp Reisner 890b411b363SPhilipp Reisner /* we don't want delays. 89125985edcSLucas De Marchi * we use TCP_CORK where appropriate, though */ 892b411b363SPhilipp Reisner drbd_tcp_nodelay(sock); 893b411b363SPhilipp Reisner drbd_tcp_nodelay(msock); 894b411b363SPhilipp Reisner 895907599e0SPhilipp Reisner tconn->data.socket = sock; 896907599e0SPhilipp Reisner tconn->meta.socket = msock; 897907599e0SPhilipp Reisner tconn->last_received = jiffies; 898b411b363SPhilipp Reisner 899907599e0SPhilipp Reisner h = drbd_do_handshake(tconn); 900b411b363SPhilipp Reisner if (h <= 0) 901b411b363SPhilipp Reisner return h; 902b411b363SPhilipp Reisner 903907599e0SPhilipp Reisner if (tconn->cram_hmac_tfm) { 904b411b363SPhilipp Reisner /* drbd_request_state(mdev, NS(conn, WFAuth)); */ 905907599e0SPhilipp Reisner switch (drbd_do_auth(tconn)) { 906b10d96cbSJohannes Thoma case -1: 907907599e0SPhilipp Reisner conn_err(tconn, "Authentication of peer failed\n"); 908b411b363SPhilipp Reisner return -1; 909b10d96cbSJohannes Thoma case 0: 910907599e0SPhilipp Reisner conn_err(tconn, "Authentication of peer failed, trying again.\n"); 911b10d96cbSJohannes Thoma return 0; 912b411b363SPhilipp Reisner } 913b411b363SPhilipp Reisner } 914b411b363SPhilipp Reisner 915bbeb641cSPhilipp Reisner if (conn_request_state(tconn, NS(conn, C_WF_REPORT_PARAMS), CS_VERBOSE) < SS_SUCCESS) 916b411b363SPhilipp Reisner return 0; 917b411b363SPhilipp Reisner 918907599e0SPhilipp Reisner sock->sk->sk_sndtimeo = tconn->net_conf->timeout*HZ/10; 919b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 920b411b363SPhilipp Reisner 921907599e0SPhilipp Reisner drbd_thread_start(&tconn->asender); 922b411b363SPhilipp Reisner 923907599e0SPhilipp Reisner if (drbd_send_protocol(tconn) == -1) 9247e2455c1SPhilipp Reisner return -1; 925b411b363SPhilipp Reisner 926907599e0SPhilipp Reisner return !idr_for_each(&tconn->volumes, drbd_connected, tconn); 927b411b363SPhilipp Reisner 928b411b363SPhilipp Reisner out_release_sockets: 929b411b363SPhilipp Reisner if (sock) 930b411b363SPhilipp Reisner sock_release(sock); 931b411b363SPhilipp Reisner if (msock) 932b411b363SPhilipp Reisner sock_release(msock); 933b411b363SPhilipp Reisner return -1; 934b411b363SPhilipp Reisner } 935b411b363SPhilipp Reisner 936ce243853SPhilipp Reisner static bool decode_header(struct drbd_tconn *tconn, struct p_header *h, struct packet_info *pi) 937b411b363SPhilipp Reisner { 938fd340c12SPhilipp Reisner if (h->h80.magic == cpu_to_be32(DRBD_MAGIC)) { 93977351055SPhilipp Reisner pi->cmd = be16_to_cpu(h->h80.command); 94077351055SPhilipp Reisner pi->size = be16_to_cpu(h->h80.length); 941eefc2f7dSPhilipp Reisner pi->vnr = 0; 942ca9bc12bSAndreas Gruenbacher } else if (h->h95.magic == cpu_to_be16(DRBD_MAGIC_BIG)) { 94377351055SPhilipp Reisner pi->cmd = be16_to_cpu(h->h95.command); 94477351055SPhilipp Reisner pi->size = be32_to_cpu(h->h95.length) & 0x00ffffff; 94577351055SPhilipp Reisner pi->vnr = 0; 94602918be2SPhilipp Reisner } else { 947ce243853SPhilipp Reisner conn_err(tconn, "magic?? on data m: 0x%08x c: %d l: %d\n", 948004352faSLars Ellenberg be32_to_cpu(h->h80.magic), 949004352faSLars Ellenberg be16_to_cpu(h->h80.command), 950004352faSLars Ellenberg be16_to_cpu(h->h80.length)); 95181e84650SAndreas Gruenbacher return false; 952b411b363SPhilipp Reisner } 953257d0af6SPhilipp Reisner return true; 954257d0af6SPhilipp Reisner } 955257d0af6SPhilipp Reisner 9569ba7aa00SPhilipp Reisner static int drbd_recv_header(struct drbd_tconn *tconn, struct packet_info *pi) 957257d0af6SPhilipp Reisner { 9589ba7aa00SPhilipp Reisner struct p_header *h = &tconn->data.rbuf.header; 959257d0af6SPhilipp Reisner int r; 960257d0af6SPhilipp Reisner 9619ba7aa00SPhilipp Reisner r = drbd_recv(tconn, h, sizeof(*h)); 962257d0af6SPhilipp Reisner if (unlikely(r != sizeof(*h))) { 963257d0af6SPhilipp Reisner if (!signal_pending(current)) 9649ba7aa00SPhilipp Reisner conn_warn(tconn, "short read expecting header on sock: r=%d\n", r); 965257d0af6SPhilipp Reisner return false; 966257d0af6SPhilipp Reisner } 967257d0af6SPhilipp Reisner 9689ba7aa00SPhilipp Reisner r = decode_header(tconn, h, pi); 9699ba7aa00SPhilipp Reisner tconn->last_received = jiffies; 970b411b363SPhilipp Reisner 971257d0af6SPhilipp Reisner return r; 972b411b363SPhilipp Reisner } 973b411b363SPhilipp Reisner 9742451fc3bSPhilipp Reisner static void drbd_flush(struct drbd_conf *mdev) 975b411b363SPhilipp Reisner { 976b411b363SPhilipp Reisner int rv; 977b411b363SPhilipp Reisner 978b411b363SPhilipp Reisner if (mdev->write_ordering >= WO_bdev_flush && get_ldev(mdev)) { 979fbd9b09aSDmitry Monakhov rv = blkdev_issue_flush(mdev->ldev->backing_bdev, GFP_KERNEL, 980dd3932edSChristoph Hellwig NULL); 981b411b363SPhilipp Reisner if (rv) { 982b411b363SPhilipp Reisner dev_err(DEV, "local disk flush failed with status %d\n", rv); 983b411b363SPhilipp Reisner /* would rather check on EOPNOTSUPP, but that is not reliable. 984b411b363SPhilipp Reisner * don't try again for ANY return value != 0 985b411b363SPhilipp Reisner * if (rv == -EOPNOTSUPP) */ 986b411b363SPhilipp Reisner drbd_bump_write_ordering(mdev, WO_drain_io); 987b411b363SPhilipp Reisner } 988b411b363SPhilipp Reisner put_ldev(mdev); 989b411b363SPhilipp Reisner } 990b411b363SPhilipp Reisner } 991b411b363SPhilipp Reisner 992b411b363SPhilipp Reisner /** 993b411b363SPhilipp Reisner * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. 994b411b363SPhilipp Reisner * @mdev: DRBD device. 995b411b363SPhilipp Reisner * @epoch: Epoch object. 996b411b363SPhilipp Reisner * @ev: Epoch event. 997b411b363SPhilipp Reisner */ 998b411b363SPhilipp Reisner static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev, 999b411b363SPhilipp Reisner struct drbd_epoch *epoch, 1000b411b363SPhilipp Reisner enum epoch_event ev) 1001b411b363SPhilipp Reisner { 10022451fc3bSPhilipp Reisner int epoch_size; 1003b411b363SPhilipp Reisner struct drbd_epoch *next_epoch; 1004b411b363SPhilipp Reisner enum finish_epoch rv = FE_STILL_LIVE; 1005b411b363SPhilipp Reisner 1006b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1007b411b363SPhilipp Reisner do { 1008b411b363SPhilipp Reisner next_epoch = NULL; 1009b411b363SPhilipp Reisner 1010b411b363SPhilipp Reisner epoch_size = atomic_read(&epoch->epoch_size); 1011b411b363SPhilipp Reisner 1012b411b363SPhilipp Reisner switch (ev & ~EV_CLEANUP) { 1013b411b363SPhilipp Reisner case EV_PUT: 1014b411b363SPhilipp Reisner atomic_dec(&epoch->active); 1015b411b363SPhilipp Reisner break; 1016b411b363SPhilipp Reisner case EV_GOT_BARRIER_NR: 1017b411b363SPhilipp Reisner set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); 1018b411b363SPhilipp Reisner break; 1019b411b363SPhilipp Reisner case EV_BECAME_LAST: 1020b411b363SPhilipp Reisner /* nothing to do*/ 1021b411b363SPhilipp Reisner break; 1022b411b363SPhilipp Reisner } 1023b411b363SPhilipp Reisner 1024b411b363SPhilipp Reisner if (epoch_size != 0 && 1025b411b363SPhilipp Reisner atomic_read(&epoch->active) == 0 && 10262451fc3bSPhilipp Reisner test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) { 1027b411b363SPhilipp Reisner if (!(ev & EV_CLEANUP)) { 1028b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1029b411b363SPhilipp Reisner drbd_send_b_ack(mdev, epoch->barrier_nr, epoch_size); 1030b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1031b411b363SPhilipp Reisner } 1032b411b363SPhilipp Reisner dec_unacked(mdev); 1033b411b363SPhilipp Reisner 1034b411b363SPhilipp Reisner if (mdev->current_epoch != epoch) { 1035b411b363SPhilipp Reisner next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); 1036b411b363SPhilipp Reisner list_del(&epoch->list); 1037b411b363SPhilipp Reisner ev = EV_BECAME_LAST | (ev & EV_CLEANUP); 1038b411b363SPhilipp Reisner mdev->epochs--; 1039b411b363SPhilipp Reisner kfree(epoch); 1040b411b363SPhilipp Reisner 1041b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1042b411b363SPhilipp Reisner rv = FE_DESTROYED; 1043b411b363SPhilipp Reisner } else { 1044b411b363SPhilipp Reisner epoch->flags = 0; 1045b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1046698f9315SUwe Kleine-König /* atomic_set(&epoch->active, 0); is already zero */ 1047b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1048b411b363SPhilipp Reisner rv = FE_RECYCLED; 10492451fc3bSPhilipp Reisner wake_up(&mdev->ee_wait); 1050b411b363SPhilipp Reisner } 1051b411b363SPhilipp Reisner } 1052b411b363SPhilipp Reisner 1053b411b363SPhilipp Reisner if (!next_epoch) 1054b411b363SPhilipp Reisner break; 1055b411b363SPhilipp Reisner 1056b411b363SPhilipp Reisner epoch = next_epoch; 1057b411b363SPhilipp Reisner } while (1); 1058b411b363SPhilipp Reisner 1059b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1060b411b363SPhilipp Reisner 1061b411b363SPhilipp Reisner return rv; 1062b411b363SPhilipp Reisner } 1063b411b363SPhilipp Reisner 1064b411b363SPhilipp Reisner /** 1065b411b363SPhilipp Reisner * drbd_bump_write_ordering() - Fall back to an other write ordering method 1066b411b363SPhilipp Reisner * @mdev: DRBD device. 1067b411b363SPhilipp Reisner * @wo: Write ordering method to try. 1068b411b363SPhilipp Reisner */ 1069b411b363SPhilipp Reisner void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo) __must_hold(local) 1070b411b363SPhilipp Reisner { 1071b411b363SPhilipp Reisner enum write_ordering_e pwo; 1072b411b363SPhilipp Reisner static char *write_ordering_str[] = { 1073b411b363SPhilipp Reisner [WO_none] = "none", 1074b411b363SPhilipp Reisner [WO_drain_io] = "drain", 1075b411b363SPhilipp Reisner [WO_bdev_flush] = "flush", 1076b411b363SPhilipp Reisner }; 1077b411b363SPhilipp Reisner 1078b411b363SPhilipp Reisner pwo = mdev->write_ordering; 1079b411b363SPhilipp Reisner wo = min(pwo, wo); 1080b411b363SPhilipp Reisner if (wo == WO_bdev_flush && mdev->ldev->dc.no_disk_flush) 1081b411b363SPhilipp Reisner wo = WO_drain_io; 1082b411b363SPhilipp Reisner if (wo == WO_drain_io && mdev->ldev->dc.no_disk_drain) 1083b411b363SPhilipp Reisner wo = WO_none; 1084b411b363SPhilipp Reisner mdev->write_ordering = wo; 10852451fc3bSPhilipp Reisner if (pwo != mdev->write_ordering || wo == WO_bdev_flush) 1086b411b363SPhilipp Reisner dev_info(DEV, "Method to ensure write ordering: %s\n", write_ordering_str[mdev->write_ordering]); 1087b411b363SPhilipp Reisner } 1088b411b363SPhilipp Reisner 1089b411b363SPhilipp Reisner /** 109045bb912bSLars Ellenberg * drbd_submit_ee() 109145bb912bSLars Ellenberg * @mdev: DRBD device. 1092db830c46SAndreas Gruenbacher * @peer_req: peer request 109345bb912bSLars Ellenberg * @rw: flag field, see bio->bi_rw 109410f6d992SLars Ellenberg * 109510f6d992SLars Ellenberg * May spread the pages to multiple bios, 109610f6d992SLars Ellenberg * depending on bio_add_page restrictions. 109710f6d992SLars Ellenberg * 109810f6d992SLars Ellenberg * Returns 0 if all bios have been submitted, 109910f6d992SLars Ellenberg * -ENOMEM if we could not allocate enough bios, 110010f6d992SLars Ellenberg * -ENOSPC (any better suggestion?) if we have not been able to bio_add_page a 110110f6d992SLars Ellenberg * single page to an empty bio (which should never happen and likely indicates 110210f6d992SLars Ellenberg * that the lower level IO stack is in some way broken). This has been observed 110310f6d992SLars Ellenberg * on certain Xen deployments. 110445bb912bSLars Ellenberg */ 110545bb912bSLars Ellenberg /* TODO allocate from our own bio_set. */ 1106db830c46SAndreas Gruenbacher int drbd_submit_ee(struct drbd_conf *mdev, struct drbd_peer_request *peer_req, 110745bb912bSLars Ellenberg const unsigned rw, const int fault_type) 110845bb912bSLars Ellenberg { 110945bb912bSLars Ellenberg struct bio *bios = NULL; 111045bb912bSLars Ellenberg struct bio *bio; 1111db830c46SAndreas Gruenbacher struct page *page = peer_req->pages; 1112db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 1113db830c46SAndreas Gruenbacher unsigned ds = peer_req->i.size; 111445bb912bSLars Ellenberg unsigned n_bios = 0; 111545bb912bSLars Ellenberg unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT; 111610f6d992SLars Ellenberg int err = -ENOMEM; 111745bb912bSLars Ellenberg 111845bb912bSLars Ellenberg /* In most cases, we will only need one bio. But in case the lower 111945bb912bSLars Ellenberg * level restrictions happen to be different at this offset on this 112045bb912bSLars Ellenberg * side than those of the sending peer, we may need to submit the 112145bb912bSLars Ellenberg * request in more than one bio. */ 112245bb912bSLars Ellenberg next_bio: 112345bb912bSLars Ellenberg bio = bio_alloc(GFP_NOIO, nr_pages); 112445bb912bSLars Ellenberg if (!bio) { 112545bb912bSLars Ellenberg dev_err(DEV, "submit_ee: Allocation of a bio failed\n"); 112645bb912bSLars Ellenberg goto fail; 112745bb912bSLars Ellenberg } 1128db830c46SAndreas Gruenbacher /* > peer_req->i.sector, unless this is the first bio */ 112945bb912bSLars Ellenberg bio->bi_sector = sector; 113045bb912bSLars Ellenberg bio->bi_bdev = mdev->ldev->backing_bdev; 113145bb912bSLars Ellenberg bio->bi_rw = rw; 1132db830c46SAndreas Gruenbacher bio->bi_private = peer_req; 113345bb912bSLars Ellenberg bio->bi_end_io = drbd_endio_sec; 113445bb912bSLars Ellenberg 113545bb912bSLars Ellenberg bio->bi_next = bios; 113645bb912bSLars Ellenberg bios = bio; 113745bb912bSLars Ellenberg ++n_bios; 113845bb912bSLars Ellenberg 113945bb912bSLars Ellenberg page_chain_for_each(page) { 114045bb912bSLars Ellenberg unsigned len = min_t(unsigned, ds, PAGE_SIZE); 114145bb912bSLars Ellenberg if (!bio_add_page(bio, page, len, 0)) { 114210f6d992SLars Ellenberg /* A single page must always be possible! 114310f6d992SLars Ellenberg * But in case it fails anyways, 114410f6d992SLars Ellenberg * we deal with it, and complain (below). */ 114510f6d992SLars Ellenberg if (bio->bi_vcnt == 0) { 114610f6d992SLars Ellenberg dev_err(DEV, 114710f6d992SLars Ellenberg "bio_add_page failed for len=%u, " 114810f6d992SLars Ellenberg "bi_vcnt=0 (bi_sector=%llu)\n", 114910f6d992SLars Ellenberg len, (unsigned long long)bio->bi_sector); 115010f6d992SLars Ellenberg err = -ENOSPC; 115110f6d992SLars Ellenberg goto fail; 115210f6d992SLars Ellenberg } 115345bb912bSLars Ellenberg goto next_bio; 115445bb912bSLars Ellenberg } 115545bb912bSLars Ellenberg ds -= len; 115645bb912bSLars Ellenberg sector += len >> 9; 115745bb912bSLars Ellenberg --nr_pages; 115845bb912bSLars Ellenberg } 115945bb912bSLars Ellenberg D_ASSERT(page == NULL); 116045bb912bSLars Ellenberg D_ASSERT(ds == 0); 116145bb912bSLars Ellenberg 1162db830c46SAndreas Gruenbacher atomic_set(&peer_req->pending_bios, n_bios); 116345bb912bSLars Ellenberg do { 116445bb912bSLars Ellenberg bio = bios; 116545bb912bSLars Ellenberg bios = bios->bi_next; 116645bb912bSLars Ellenberg bio->bi_next = NULL; 116745bb912bSLars Ellenberg 116845bb912bSLars Ellenberg drbd_generic_make_request(mdev, fault_type, bio); 116945bb912bSLars Ellenberg } while (bios); 117045bb912bSLars Ellenberg return 0; 117145bb912bSLars Ellenberg 117245bb912bSLars Ellenberg fail: 117345bb912bSLars Ellenberg while (bios) { 117445bb912bSLars Ellenberg bio = bios; 117545bb912bSLars Ellenberg bios = bios->bi_next; 117645bb912bSLars Ellenberg bio_put(bio); 117745bb912bSLars Ellenberg } 117810f6d992SLars Ellenberg return err; 117945bb912bSLars Ellenberg } 118045bb912bSLars Ellenberg 118153840641SAndreas Gruenbacher static void drbd_remove_epoch_entry_interval(struct drbd_conf *mdev, 1182db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req) 118353840641SAndreas Gruenbacher { 1184db830c46SAndreas Gruenbacher struct drbd_interval *i = &peer_req->i; 118553840641SAndreas Gruenbacher 118653840641SAndreas Gruenbacher drbd_remove_interval(&mdev->write_requests, i); 118753840641SAndreas Gruenbacher drbd_clear_interval(i); 118853840641SAndreas Gruenbacher 11896c852becSAndreas Gruenbacher /* Wake up any processes waiting for this peer request to complete. */ 119053840641SAndreas Gruenbacher if (i->waiting) 119153840641SAndreas Gruenbacher wake_up(&mdev->misc_wait); 119253840641SAndreas Gruenbacher } 119353840641SAndreas Gruenbacher 1194d8763023SAndreas Gruenbacher static int receive_Barrier(struct drbd_conf *mdev, enum drbd_packet cmd, 1195d8763023SAndreas Gruenbacher unsigned int data_size) 1196b411b363SPhilipp Reisner { 11972451fc3bSPhilipp Reisner int rv; 1198e42325a5SPhilipp Reisner struct p_barrier *p = &mdev->tconn->data.rbuf.barrier; 1199b411b363SPhilipp Reisner struct drbd_epoch *epoch; 1200b411b363SPhilipp Reisner 1201b411b363SPhilipp Reisner inc_unacked(mdev); 1202b411b363SPhilipp Reisner 1203b411b363SPhilipp Reisner mdev->current_epoch->barrier_nr = p->barrier; 1204b411b363SPhilipp Reisner rv = drbd_may_finish_epoch(mdev, mdev->current_epoch, EV_GOT_BARRIER_NR); 1205b411b363SPhilipp Reisner 1206b411b363SPhilipp Reisner /* P_BARRIER_ACK may imply that the corresponding extent is dropped from 1207b411b363SPhilipp Reisner * the activity log, which means it would not be resynced in case the 1208b411b363SPhilipp Reisner * R_PRIMARY crashes now. 1209b411b363SPhilipp Reisner * Therefore we must send the barrier_ack after the barrier request was 1210b411b363SPhilipp Reisner * completed. */ 1211b411b363SPhilipp Reisner switch (mdev->write_ordering) { 1212b411b363SPhilipp Reisner case WO_none: 1213b411b363SPhilipp Reisner if (rv == FE_RECYCLED) 121481e84650SAndreas Gruenbacher return true; 1215b411b363SPhilipp Reisner 1216b411b363SPhilipp Reisner /* receiver context, in the writeout path of the other node. 1217b411b363SPhilipp Reisner * avoid potential distributed deadlock */ 1218b411b363SPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 12192451fc3bSPhilipp Reisner if (epoch) 12202451fc3bSPhilipp Reisner break; 12212451fc3bSPhilipp Reisner else 1222b411b363SPhilipp Reisner dev_warn(DEV, "Allocation of an epoch failed, slowing down\n"); 12232451fc3bSPhilipp Reisner /* Fall through */ 12242451fc3bSPhilipp Reisner 12252451fc3bSPhilipp Reisner case WO_bdev_flush: 12262451fc3bSPhilipp Reisner case WO_drain_io: 1227b411b363SPhilipp Reisner drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 12282451fc3bSPhilipp Reisner drbd_flush(mdev); 12292451fc3bSPhilipp Reisner 12302451fc3bSPhilipp Reisner if (atomic_read(&mdev->current_epoch->epoch_size)) { 12312451fc3bSPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 12322451fc3bSPhilipp Reisner if (epoch) 12332451fc3bSPhilipp Reisner break; 1234b411b363SPhilipp Reisner } 1235b411b363SPhilipp Reisner 12362451fc3bSPhilipp Reisner epoch = mdev->current_epoch; 12372451fc3bSPhilipp Reisner wait_event(mdev->ee_wait, atomic_read(&epoch->epoch_size) == 0); 12382451fc3bSPhilipp Reisner 12392451fc3bSPhilipp Reisner D_ASSERT(atomic_read(&epoch->active) == 0); 12402451fc3bSPhilipp Reisner D_ASSERT(epoch->flags == 0); 1241b411b363SPhilipp Reisner 124281e84650SAndreas Gruenbacher return true; 12432451fc3bSPhilipp Reisner default: 12442451fc3bSPhilipp Reisner dev_err(DEV, "Strangeness in mdev->write_ordering %d\n", mdev->write_ordering); 124581e84650SAndreas Gruenbacher return false; 1246b411b363SPhilipp Reisner } 1247b411b363SPhilipp Reisner 1248b411b363SPhilipp Reisner epoch->flags = 0; 1249b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1250b411b363SPhilipp Reisner atomic_set(&epoch->active, 0); 1251b411b363SPhilipp Reisner 1252b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1253b411b363SPhilipp Reisner if (atomic_read(&mdev->current_epoch->epoch_size)) { 1254b411b363SPhilipp Reisner list_add(&epoch->list, &mdev->current_epoch->list); 1255b411b363SPhilipp Reisner mdev->current_epoch = epoch; 1256b411b363SPhilipp Reisner mdev->epochs++; 1257b411b363SPhilipp Reisner } else { 1258b411b363SPhilipp Reisner /* The current_epoch got recycled while we allocated this one... */ 1259b411b363SPhilipp Reisner kfree(epoch); 1260b411b363SPhilipp Reisner } 1261b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1262b411b363SPhilipp Reisner 126381e84650SAndreas Gruenbacher return true; 1264b411b363SPhilipp Reisner } 1265b411b363SPhilipp Reisner 1266b411b363SPhilipp Reisner /* used from receive_RSDataReply (recv_resync_read) 1267b411b363SPhilipp Reisner * and from receive_Data */ 1268f6ffca9fSAndreas Gruenbacher static struct drbd_peer_request * 1269f6ffca9fSAndreas Gruenbacher read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, 1270f6ffca9fSAndreas Gruenbacher int data_size) __must_hold(local) 1271b411b363SPhilipp Reisner { 12726666032aSLars Ellenberg const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 1273db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 1274b411b363SPhilipp Reisner struct page *page; 127545bb912bSLars Ellenberg int dgs, ds, rr; 1276a0638456SPhilipp Reisner void *dig_in = mdev->tconn->int_dig_in; 1277a0638456SPhilipp Reisner void *dig_vv = mdev->tconn->int_dig_vv; 12786b4388acSPhilipp Reisner unsigned long *data; 1279b411b363SPhilipp Reisner 1280a0638456SPhilipp Reisner dgs = (mdev->tconn->agreed_pro_version >= 87 && mdev->tconn->integrity_r_tfm) ? 1281a0638456SPhilipp Reisner crypto_hash_digestsize(mdev->tconn->integrity_r_tfm) : 0; 1282b411b363SPhilipp Reisner 1283b411b363SPhilipp Reisner if (dgs) { 1284de0ff338SPhilipp Reisner rr = drbd_recv(mdev->tconn, dig_in, dgs); 1285b411b363SPhilipp Reisner if (rr != dgs) { 12860ddc5549SLars Ellenberg if (!signal_pending(current)) 12870ddc5549SLars Ellenberg dev_warn(DEV, 12880ddc5549SLars Ellenberg "short read receiving data digest: read %d expected %d\n", 1289b411b363SPhilipp Reisner rr, dgs); 1290b411b363SPhilipp Reisner return NULL; 1291b411b363SPhilipp Reisner } 1292b411b363SPhilipp Reisner } 1293b411b363SPhilipp Reisner 1294b411b363SPhilipp Reisner data_size -= dgs; 1295b411b363SPhilipp Reisner 1296841ce241SAndreas Gruenbacher if (!expect(data_size != 0)) 1297841ce241SAndreas Gruenbacher return NULL; 1298841ce241SAndreas Gruenbacher if (!expect(IS_ALIGNED(data_size, 512))) 1299841ce241SAndreas Gruenbacher return NULL; 1300841ce241SAndreas Gruenbacher if (!expect(data_size <= DRBD_MAX_BIO_SIZE)) 1301841ce241SAndreas Gruenbacher return NULL; 1302b411b363SPhilipp Reisner 13036666032aSLars Ellenberg /* even though we trust out peer, 13046666032aSLars Ellenberg * we sometimes have to double check. */ 13056666032aSLars Ellenberg if (sector + (data_size>>9) > capacity) { 1306fdda6544SLars Ellenberg dev_err(DEV, "request from peer beyond end of local disk: " 1307fdda6544SLars Ellenberg "capacity: %llus < sector: %llus + size: %u\n", 13086666032aSLars Ellenberg (unsigned long long)capacity, 13096666032aSLars Ellenberg (unsigned long long)sector, data_size); 13106666032aSLars Ellenberg return NULL; 13116666032aSLars Ellenberg } 13126666032aSLars Ellenberg 1313b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 1314b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 1315b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 1316db830c46SAndreas Gruenbacher peer_req = drbd_alloc_ee(mdev, id, sector, data_size, GFP_NOIO); 1317db830c46SAndreas Gruenbacher if (!peer_req) 1318b411b363SPhilipp Reisner return NULL; 131945bb912bSLars Ellenberg 1320b411b363SPhilipp Reisner ds = data_size; 1321db830c46SAndreas Gruenbacher page = peer_req->pages; 132245bb912bSLars Ellenberg page_chain_for_each(page) { 132345bb912bSLars Ellenberg unsigned len = min_t(int, ds, PAGE_SIZE); 13246b4388acSPhilipp Reisner data = kmap(page); 1325de0ff338SPhilipp Reisner rr = drbd_recv(mdev->tconn, data, len); 13260cf9d27eSAndreas Gruenbacher if (drbd_insert_fault(mdev, DRBD_FAULT_RECEIVE)) { 13276b4388acSPhilipp Reisner dev_err(DEV, "Fault injection: Corrupting data on receive\n"); 13286b4388acSPhilipp Reisner data[0] = data[0] ^ (unsigned long)-1; 13296b4388acSPhilipp Reisner } 1330b411b363SPhilipp Reisner kunmap(page); 133145bb912bSLars Ellenberg if (rr != len) { 1332db830c46SAndreas Gruenbacher drbd_free_ee(mdev, peer_req); 13330ddc5549SLars Ellenberg if (!signal_pending(current)) 1334b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data: read %d expected %d\n", 133545bb912bSLars Ellenberg rr, len); 1336b411b363SPhilipp Reisner return NULL; 1337b411b363SPhilipp Reisner } 1338b411b363SPhilipp Reisner ds -= rr; 1339b411b363SPhilipp Reisner } 1340b411b363SPhilipp Reisner 1341b411b363SPhilipp Reisner if (dgs) { 1342db830c46SAndreas Gruenbacher drbd_csum_ee(mdev, mdev->tconn->integrity_r_tfm, peer_req, dig_vv); 1343b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1344470be44aSLars Ellenberg dev_err(DEV, "Digest integrity check FAILED: %llus +%u\n", 1345470be44aSLars Ellenberg (unsigned long long)sector, data_size); 1346b411b363SPhilipp Reisner drbd_bcast_ee(mdev, "digest failed", 1347db830c46SAndreas Gruenbacher dgs, dig_in, dig_vv, peer_req); 1348db830c46SAndreas Gruenbacher drbd_free_ee(mdev, peer_req); 1349b411b363SPhilipp Reisner return NULL; 1350b411b363SPhilipp Reisner } 1351b411b363SPhilipp Reisner } 1352b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1353db830c46SAndreas Gruenbacher return peer_req; 1354b411b363SPhilipp Reisner } 1355b411b363SPhilipp Reisner 1356b411b363SPhilipp Reisner /* drbd_drain_block() just takes a data block 1357b411b363SPhilipp Reisner * out of the socket input buffer, and discards it. 1358b411b363SPhilipp Reisner */ 1359b411b363SPhilipp Reisner static int drbd_drain_block(struct drbd_conf *mdev, int data_size) 1360b411b363SPhilipp Reisner { 1361b411b363SPhilipp Reisner struct page *page; 1362b411b363SPhilipp Reisner int rr, rv = 1; 1363b411b363SPhilipp Reisner void *data; 1364b411b363SPhilipp Reisner 1365c3470cdeSLars Ellenberg if (!data_size) 136681e84650SAndreas Gruenbacher return true; 1367c3470cdeSLars Ellenberg 136845bb912bSLars Ellenberg page = drbd_pp_alloc(mdev, 1, 1); 1369b411b363SPhilipp Reisner 1370b411b363SPhilipp Reisner data = kmap(page); 1371b411b363SPhilipp Reisner while (data_size) { 1372de0ff338SPhilipp Reisner rr = drbd_recv(mdev->tconn, data, min_t(int, data_size, PAGE_SIZE)); 1373b411b363SPhilipp Reisner if (rr != min_t(int, data_size, PAGE_SIZE)) { 1374b411b363SPhilipp Reisner rv = 0; 13750ddc5549SLars Ellenberg if (!signal_pending(current)) 13760ddc5549SLars Ellenberg dev_warn(DEV, 13770ddc5549SLars Ellenberg "short read receiving data: read %d expected %d\n", 1378b411b363SPhilipp Reisner rr, min_t(int, data_size, PAGE_SIZE)); 1379b411b363SPhilipp Reisner break; 1380b411b363SPhilipp Reisner } 1381b411b363SPhilipp Reisner data_size -= rr; 1382b411b363SPhilipp Reisner } 1383b411b363SPhilipp Reisner kunmap(page); 1384435f0740SLars Ellenberg drbd_pp_free(mdev, page, 0); 1385b411b363SPhilipp Reisner return rv; 1386b411b363SPhilipp Reisner } 1387b411b363SPhilipp Reisner 1388b411b363SPhilipp Reisner static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req, 1389b411b363SPhilipp Reisner sector_t sector, int data_size) 1390b411b363SPhilipp Reisner { 1391b411b363SPhilipp Reisner struct bio_vec *bvec; 1392b411b363SPhilipp Reisner struct bio *bio; 1393b411b363SPhilipp Reisner int dgs, rr, i, expect; 1394a0638456SPhilipp Reisner void *dig_in = mdev->tconn->int_dig_in; 1395a0638456SPhilipp Reisner void *dig_vv = mdev->tconn->int_dig_vv; 1396b411b363SPhilipp Reisner 1397a0638456SPhilipp Reisner dgs = (mdev->tconn->agreed_pro_version >= 87 && mdev->tconn->integrity_r_tfm) ? 1398a0638456SPhilipp Reisner crypto_hash_digestsize(mdev->tconn->integrity_r_tfm) : 0; 1399b411b363SPhilipp Reisner 1400b411b363SPhilipp Reisner if (dgs) { 1401de0ff338SPhilipp Reisner rr = drbd_recv(mdev->tconn, dig_in, dgs); 1402b411b363SPhilipp Reisner if (rr != dgs) { 14030ddc5549SLars Ellenberg if (!signal_pending(current)) 14040ddc5549SLars Ellenberg dev_warn(DEV, 14050ddc5549SLars Ellenberg "short read receiving data reply digest: read %d expected %d\n", 1406b411b363SPhilipp Reisner rr, dgs); 1407b411b363SPhilipp Reisner return 0; 1408b411b363SPhilipp Reisner } 1409b411b363SPhilipp Reisner } 1410b411b363SPhilipp Reisner 1411b411b363SPhilipp Reisner data_size -= dgs; 1412b411b363SPhilipp Reisner 1413b411b363SPhilipp Reisner /* optimistically update recv_cnt. if receiving fails below, 1414b411b363SPhilipp Reisner * we disconnect anyways, and counters will be reset. */ 1415b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1416b411b363SPhilipp Reisner 1417b411b363SPhilipp Reisner bio = req->master_bio; 1418b411b363SPhilipp Reisner D_ASSERT(sector == bio->bi_sector); 1419b411b363SPhilipp Reisner 1420b411b363SPhilipp Reisner bio_for_each_segment(bvec, bio, i) { 1421b411b363SPhilipp Reisner expect = min_t(int, data_size, bvec->bv_len); 1422de0ff338SPhilipp Reisner rr = drbd_recv(mdev->tconn, 1423b411b363SPhilipp Reisner kmap(bvec->bv_page)+bvec->bv_offset, 1424b411b363SPhilipp Reisner expect); 1425b411b363SPhilipp Reisner kunmap(bvec->bv_page); 1426b411b363SPhilipp Reisner if (rr != expect) { 14270ddc5549SLars Ellenberg if (!signal_pending(current)) 1428b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data reply: " 1429b411b363SPhilipp Reisner "read %d expected %d\n", 1430b411b363SPhilipp Reisner rr, expect); 1431b411b363SPhilipp Reisner return 0; 1432b411b363SPhilipp Reisner } 1433b411b363SPhilipp Reisner data_size -= rr; 1434b411b363SPhilipp Reisner } 1435b411b363SPhilipp Reisner 1436b411b363SPhilipp Reisner if (dgs) { 1437a0638456SPhilipp Reisner drbd_csum_bio(mdev, mdev->tconn->integrity_r_tfm, bio, dig_vv); 1438b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1439b411b363SPhilipp Reisner dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n"); 1440b411b363SPhilipp Reisner return 0; 1441b411b363SPhilipp Reisner } 1442b411b363SPhilipp Reisner } 1443b411b363SPhilipp Reisner 1444b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 1445b411b363SPhilipp Reisner return 1; 1446b411b363SPhilipp Reisner } 1447b411b363SPhilipp Reisner 1448b411b363SPhilipp Reisner /* e_end_resync_block() is called via 1449b411b363SPhilipp Reisner * drbd_process_done_ee() by asender only */ 145000d56944SPhilipp Reisner static int e_end_resync_block(struct drbd_work *w, int unused) 1451b411b363SPhilipp Reisner { 1452db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req = (struct drbd_peer_request *)w; 145300d56944SPhilipp Reisner struct drbd_conf *mdev = w->mdev; 1454db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 1455b411b363SPhilipp Reisner int ok; 1456b411b363SPhilipp Reisner 1457db830c46SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&peer_req->i)); 1458b411b363SPhilipp Reisner 1459db830c46SAndreas Gruenbacher if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { 1460db830c46SAndreas Gruenbacher drbd_set_in_sync(mdev, sector, peer_req->i.size); 1461db830c46SAndreas Gruenbacher ok = drbd_send_ack(mdev, P_RS_WRITE_ACK, peer_req); 1462b411b363SPhilipp Reisner } else { 1463b411b363SPhilipp Reisner /* Record failure to sync */ 1464db830c46SAndreas Gruenbacher drbd_rs_failed_io(mdev, sector, peer_req->i.size); 1465b411b363SPhilipp Reisner 1466db830c46SAndreas Gruenbacher ok = drbd_send_ack(mdev, P_NEG_ACK, peer_req); 1467b411b363SPhilipp Reisner } 1468b411b363SPhilipp Reisner dec_unacked(mdev); 1469b411b363SPhilipp Reisner 1470b411b363SPhilipp Reisner return ok; 1471b411b363SPhilipp Reisner } 1472b411b363SPhilipp Reisner 1473b411b363SPhilipp Reisner static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local) 1474b411b363SPhilipp Reisner { 1475db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 1476b411b363SPhilipp Reisner 1477db830c46SAndreas Gruenbacher peer_req = read_in_block(mdev, ID_SYNCER, sector, data_size); 1478db830c46SAndreas Gruenbacher if (!peer_req) 147945bb912bSLars Ellenberg goto fail; 1480b411b363SPhilipp Reisner 1481b411b363SPhilipp Reisner dec_rs_pending(mdev); 1482b411b363SPhilipp Reisner 1483b411b363SPhilipp Reisner inc_unacked(mdev); 1484b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_resync_block() 1485b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 1486b411b363SPhilipp Reisner 1487db830c46SAndreas Gruenbacher peer_req->w.cb = e_end_resync_block; 148845bb912bSLars Ellenberg 148987eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1490db830c46SAndreas Gruenbacher list_add(&peer_req->w.list, &mdev->sync_ee); 149187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1492b411b363SPhilipp Reisner 14930f0601f4SLars Ellenberg atomic_add(data_size >> 9, &mdev->rs_sect_ev); 1494db830c46SAndreas Gruenbacher if (drbd_submit_ee(mdev, peer_req, WRITE, DRBD_FAULT_RS_WR) == 0) 149581e84650SAndreas Gruenbacher return true; 149645bb912bSLars Ellenberg 149710f6d992SLars Ellenberg /* don't care for the reason here */ 149810f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 149987eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1500db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 150187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 150222cc37a9SLars Ellenberg 1503db830c46SAndreas Gruenbacher drbd_free_ee(mdev, peer_req); 150445bb912bSLars Ellenberg fail: 150545bb912bSLars Ellenberg put_ldev(mdev); 150681e84650SAndreas Gruenbacher return false; 1507b411b363SPhilipp Reisner } 1508b411b363SPhilipp Reisner 1509668eebc6SAndreas Gruenbacher static struct drbd_request * 1510bc9c5c41SAndreas Gruenbacher find_request(struct drbd_conf *mdev, struct rb_root *root, u64 id, 1511bc9c5c41SAndreas Gruenbacher sector_t sector, bool missing_ok, const char *func) 1512668eebc6SAndreas Gruenbacher { 1513668eebc6SAndreas Gruenbacher struct drbd_request *req; 1514668eebc6SAndreas Gruenbacher 1515bc9c5c41SAndreas Gruenbacher /* Request object according to our peer */ 1516bc9c5c41SAndreas Gruenbacher req = (struct drbd_request *)(unsigned long)id; 15175e472264SAndreas Gruenbacher if (drbd_contains_interval(root, sector, &req->i) && req->i.local) 1518668eebc6SAndreas Gruenbacher return req; 1519c3afd8f5SAndreas Gruenbacher if (!missing_ok) { 1520c3afd8f5SAndreas Gruenbacher dev_err(DEV, "%s: failed to find request %lu, sector %llus\n", func, 1521c3afd8f5SAndreas Gruenbacher (unsigned long)id, (unsigned long long)sector); 1522c3afd8f5SAndreas Gruenbacher } 1523668eebc6SAndreas Gruenbacher return NULL; 1524668eebc6SAndreas Gruenbacher } 1525668eebc6SAndreas Gruenbacher 1526d8763023SAndreas Gruenbacher static int receive_DataReply(struct drbd_conf *mdev, enum drbd_packet cmd, 1527d8763023SAndreas Gruenbacher unsigned int data_size) 1528b411b363SPhilipp Reisner { 1529b411b363SPhilipp Reisner struct drbd_request *req; 1530b411b363SPhilipp Reisner sector_t sector; 1531b411b363SPhilipp Reisner int ok; 1532e42325a5SPhilipp Reisner struct p_data *p = &mdev->tconn->data.rbuf.data; 1533b411b363SPhilipp Reisner 1534b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1535b411b363SPhilipp Reisner 153687eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1537bc9c5c41SAndreas Gruenbacher req = find_request(mdev, &mdev->read_requests, p->block_id, sector, false, __func__); 153887eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1539c3afd8f5SAndreas Gruenbacher if (unlikely(!req)) 154081e84650SAndreas Gruenbacher return false; 1541b411b363SPhilipp Reisner 154224c4830cSBart Van Assche /* hlist_del(&req->collision) is done in _req_may_be_done, to avoid 1543b411b363SPhilipp Reisner * special casing it there for the various failure cases. 1544b411b363SPhilipp Reisner * still no race with drbd_fail_pending_reads */ 1545b411b363SPhilipp Reisner ok = recv_dless_read(mdev, req, sector, data_size); 1546b411b363SPhilipp Reisner 1547b411b363SPhilipp Reisner if (ok) 15488554df1cSAndreas Gruenbacher req_mod(req, DATA_RECEIVED); 1549b411b363SPhilipp Reisner /* else: nothing. handled from drbd_disconnect... 1550b411b363SPhilipp Reisner * I don't think we may complete this just yet 1551b411b363SPhilipp Reisner * in case we are "on-disconnect: freeze" */ 1552b411b363SPhilipp Reisner 1553b411b363SPhilipp Reisner return ok; 1554b411b363SPhilipp Reisner } 1555b411b363SPhilipp Reisner 1556d8763023SAndreas Gruenbacher static int receive_RSDataReply(struct drbd_conf *mdev, enum drbd_packet cmd, 1557d8763023SAndreas Gruenbacher unsigned int data_size) 1558b411b363SPhilipp Reisner { 1559b411b363SPhilipp Reisner sector_t sector; 1560b411b363SPhilipp Reisner int ok; 1561e42325a5SPhilipp Reisner struct p_data *p = &mdev->tconn->data.rbuf.data; 1562b411b363SPhilipp Reisner 1563b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1564b411b363SPhilipp Reisner D_ASSERT(p->block_id == ID_SYNCER); 1565b411b363SPhilipp Reisner 1566b411b363SPhilipp Reisner if (get_ldev(mdev)) { 1567b411b363SPhilipp Reisner /* data is submitted to disk within recv_resync_read. 1568b411b363SPhilipp Reisner * corresponding put_ldev done below on error, 15699c50842aSAndreas Gruenbacher * or in drbd_endio_sec. */ 1570b411b363SPhilipp Reisner ok = recv_resync_read(mdev, sector, data_size); 1571b411b363SPhilipp Reisner } else { 1572b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 1573b411b363SPhilipp Reisner dev_err(DEV, "Can not write resync data to local disk.\n"); 1574b411b363SPhilipp Reisner 1575b411b363SPhilipp Reisner ok = drbd_drain_block(mdev, data_size); 1576b411b363SPhilipp Reisner 15772b2bf214SLars Ellenberg drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size); 1578b411b363SPhilipp Reisner } 1579b411b363SPhilipp Reisner 1580778f271dSPhilipp Reisner atomic_add(data_size >> 9, &mdev->rs_sect_in); 1581778f271dSPhilipp Reisner 1582b411b363SPhilipp Reisner return ok; 1583b411b363SPhilipp Reisner } 1584b411b363SPhilipp Reisner 1585b411b363SPhilipp Reisner /* e_end_block() is called via drbd_process_done_ee(). 1586b411b363SPhilipp Reisner * this means this function only runs in the asender thread 1587b411b363SPhilipp Reisner */ 158800d56944SPhilipp Reisner static int e_end_block(struct drbd_work *w, int cancel) 1589b411b363SPhilipp Reisner { 1590db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req = (struct drbd_peer_request *)w; 159100d56944SPhilipp Reisner struct drbd_conf *mdev = w->mdev; 1592db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 1593b411b363SPhilipp Reisner int ok = 1, pcmd; 1594b411b363SPhilipp Reisner 159589e58e75SPhilipp Reisner if (mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C) { 1596db830c46SAndreas Gruenbacher if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { 1597b411b363SPhilipp Reisner pcmd = (mdev->state.conn >= C_SYNC_SOURCE && 1598b411b363SPhilipp Reisner mdev->state.conn <= C_PAUSED_SYNC_T && 1599db830c46SAndreas Gruenbacher peer_req->flags & EE_MAY_SET_IN_SYNC) ? 1600b411b363SPhilipp Reisner P_RS_WRITE_ACK : P_WRITE_ACK; 1601db830c46SAndreas Gruenbacher ok &= drbd_send_ack(mdev, pcmd, peer_req); 1602b411b363SPhilipp Reisner if (pcmd == P_RS_WRITE_ACK) 1603db830c46SAndreas Gruenbacher drbd_set_in_sync(mdev, sector, peer_req->i.size); 1604b411b363SPhilipp Reisner } else { 1605db830c46SAndreas Gruenbacher ok = drbd_send_ack(mdev, P_NEG_ACK, peer_req); 1606b411b363SPhilipp Reisner /* we expect it to be marked out of sync anyways... 1607b411b363SPhilipp Reisner * maybe assert this? */ 1608b411b363SPhilipp Reisner } 1609b411b363SPhilipp Reisner dec_unacked(mdev); 1610b411b363SPhilipp Reisner } 1611b411b363SPhilipp Reisner /* we delete from the conflict detection hash _after_ we sent out the 1612b411b363SPhilipp Reisner * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ 161389e58e75SPhilipp Reisner if (mdev->tconn->net_conf->two_primaries) { 161487eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1615db830c46SAndreas Gruenbacher D_ASSERT(!drbd_interval_empty(&peer_req->i)); 1616db830c46SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 161787eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1618bb3bfe96SAndreas Gruenbacher } else 1619db830c46SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&peer_req->i)); 1620b411b363SPhilipp Reisner 1621db830c46SAndreas Gruenbacher drbd_may_finish_epoch(mdev, peer_req->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); 1622b411b363SPhilipp Reisner 1623b411b363SPhilipp Reisner return ok; 1624b411b363SPhilipp Reisner } 1625b411b363SPhilipp Reisner 162600d56944SPhilipp Reisner static int e_send_discard_ack(struct drbd_work *w, int unused) 1627b411b363SPhilipp Reisner { 1628db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req = (struct drbd_peer_request *)w; 162900d56944SPhilipp Reisner struct drbd_conf *mdev = w->mdev; 1630b411b363SPhilipp Reisner int ok = 1; 1631b411b363SPhilipp Reisner 163289e58e75SPhilipp Reisner D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C); 1633db830c46SAndreas Gruenbacher ok = drbd_send_ack(mdev, P_DISCARD_ACK, peer_req); 1634b411b363SPhilipp Reisner 163587eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1636db830c46SAndreas Gruenbacher D_ASSERT(!drbd_interval_empty(&peer_req->i)); 1637db830c46SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 163887eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1639b411b363SPhilipp Reisner 1640b411b363SPhilipp Reisner dec_unacked(mdev); 1641b411b363SPhilipp Reisner 1642b411b363SPhilipp Reisner return ok; 1643b411b363SPhilipp Reisner } 1644b411b363SPhilipp Reisner 16453e394da1SAndreas Gruenbacher static bool seq_greater(u32 a, u32 b) 16463e394da1SAndreas Gruenbacher { 16473e394da1SAndreas Gruenbacher /* 16483e394da1SAndreas Gruenbacher * We assume 32-bit wrap-around here. 16493e394da1SAndreas Gruenbacher * For 24-bit wrap-around, we would have to shift: 16503e394da1SAndreas Gruenbacher * a <<= 8; b <<= 8; 16513e394da1SAndreas Gruenbacher */ 16523e394da1SAndreas Gruenbacher return (s32)a - (s32)b > 0; 16533e394da1SAndreas Gruenbacher } 16543e394da1SAndreas Gruenbacher 16553e394da1SAndreas Gruenbacher static u32 seq_max(u32 a, u32 b) 16563e394da1SAndreas Gruenbacher { 16573e394da1SAndreas Gruenbacher return seq_greater(a, b) ? a : b; 16583e394da1SAndreas Gruenbacher } 16593e394da1SAndreas Gruenbacher 166043ae077dSAndreas Gruenbacher static void update_peer_seq(struct drbd_conf *mdev, unsigned int peer_seq) 16613e394da1SAndreas Gruenbacher { 166243ae077dSAndreas Gruenbacher unsigned int old_peer_seq; 16633e394da1SAndreas Gruenbacher 16643e394da1SAndreas Gruenbacher spin_lock(&mdev->peer_seq_lock); 166543ae077dSAndreas Gruenbacher old_peer_seq = mdev->peer_seq; 166643ae077dSAndreas Gruenbacher mdev->peer_seq = seq_max(mdev->peer_seq, peer_seq); 16673e394da1SAndreas Gruenbacher spin_unlock(&mdev->peer_seq_lock); 166843ae077dSAndreas Gruenbacher if (old_peer_seq != peer_seq) 16693e394da1SAndreas Gruenbacher wake_up(&mdev->seq_wait); 16703e394da1SAndreas Gruenbacher } 16713e394da1SAndreas Gruenbacher 1672b411b363SPhilipp Reisner /* Called from receive_Data. 1673b411b363SPhilipp Reisner * Synchronize packets on sock with packets on msock. 1674b411b363SPhilipp Reisner * 1675b411b363SPhilipp Reisner * This is here so even when a P_DATA packet traveling via sock overtook an Ack 1676b411b363SPhilipp Reisner * packet traveling on msock, they are still processed in the order they have 1677b411b363SPhilipp Reisner * been sent. 1678b411b363SPhilipp Reisner * 1679b411b363SPhilipp Reisner * Note: we don't care for Ack packets overtaking P_DATA packets. 1680b411b363SPhilipp Reisner * 1681b411b363SPhilipp Reisner * In case packet_seq is larger than mdev->peer_seq number, there are 1682b411b363SPhilipp Reisner * outstanding packets on the msock. We wait for them to arrive. 1683b411b363SPhilipp Reisner * In case we are the logically next packet, we update mdev->peer_seq 1684b411b363SPhilipp Reisner * ourselves. Correctly handles 32bit wrap around. 1685b411b363SPhilipp Reisner * 1686b411b363SPhilipp Reisner * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, 1687b411b363SPhilipp Reisner * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds 1688b411b363SPhilipp Reisner * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have 1689b411b363SPhilipp Reisner * 1<<9 == 512 seconds aka ages for the 32bit wrap around... 1690b411b363SPhilipp Reisner * 1691b411b363SPhilipp Reisner * returns 0 if we may process the packet, 1692b411b363SPhilipp Reisner * -ERESTARTSYS if we were interrupted (by disconnect signal). */ 1693b411b363SPhilipp Reisner static int drbd_wait_peer_seq(struct drbd_conf *mdev, const u32 packet_seq) 1694b411b363SPhilipp Reisner { 1695b411b363SPhilipp Reisner DEFINE_WAIT(wait); 1696b411b363SPhilipp Reisner unsigned int p_seq; 1697b411b363SPhilipp Reisner long timeout; 1698b411b363SPhilipp Reisner int ret = 0; 1699b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1700b411b363SPhilipp Reisner for (;;) { 1701b411b363SPhilipp Reisner prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE); 17023e394da1SAndreas Gruenbacher if (!seq_greater(packet_seq, mdev->peer_seq + 1)) 1703b411b363SPhilipp Reisner break; 1704b411b363SPhilipp Reisner if (signal_pending(current)) { 1705b411b363SPhilipp Reisner ret = -ERESTARTSYS; 1706b411b363SPhilipp Reisner break; 1707b411b363SPhilipp Reisner } 1708b411b363SPhilipp Reisner p_seq = mdev->peer_seq; 1709b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1710b411b363SPhilipp Reisner timeout = schedule_timeout(30*HZ); 1711b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1712b411b363SPhilipp Reisner if (timeout == 0 && p_seq == mdev->peer_seq) { 1713b411b363SPhilipp Reisner ret = -ETIMEDOUT; 1714b411b363SPhilipp Reisner dev_err(DEV, "ASSERT FAILED waited 30 seconds for sequence update, forcing reconnect\n"); 1715b411b363SPhilipp Reisner break; 1716b411b363SPhilipp Reisner } 1717b411b363SPhilipp Reisner } 1718b411b363SPhilipp Reisner finish_wait(&mdev->seq_wait, &wait); 1719b411b363SPhilipp Reisner if (mdev->peer_seq+1 == packet_seq) 1720b411b363SPhilipp Reisner mdev->peer_seq++; 1721b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1722b411b363SPhilipp Reisner return ret; 1723b411b363SPhilipp Reisner } 1724b411b363SPhilipp Reisner 1725688593c5SLars Ellenberg /* see also bio_flags_to_wire() 1726688593c5SLars Ellenberg * DRBD_REQ_*, because we need to semantically map the flags to data packet 1727688593c5SLars Ellenberg * flags and back. We may replicate to other kernel versions. */ 1728688593c5SLars Ellenberg static unsigned long wire_flags_to_bio(struct drbd_conf *mdev, u32 dpf) 172976d2e7ecSPhilipp Reisner { 173076d2e7ecSPhilipp Reisner return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | 173176d2e7ecSPhilipp Reisner (dpf & DP_FUA ? REQ_FUA : 0) | 1732688593c5SLars Ellenberg (dpf & DP_FLUSH ? REQ_FLUSH : 0) | 173376d2e7ecSPhilipp Reisner (dpf & DP_DISCARD ? REQ_DISCARD : 0); 173476d2e7ecSPhilipp Reisner } 173576d2e7ecSPhilipp Reisner 1736b411b363SPhilipp Reisner /* mirrored write */ 1737d8763023SAndreas Gruenbacher static int receive_Data(struct drbd_conf *mdev, enum drbd_packet cmd, 1738d8763023SAndreas Gruenbacher unsigned int data_size) 1739b411b363SPhilipp Reisner { 1740b411b363SPhilipp Reisner sector_t sector; 1741db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 1742e42325a5SPhilipp Reisner struct p_data *p = &mdev->tconn->data.rbuf.data; 1743b411b363SPhilipp Reisner int rw = WRITE; 1744b411b363SPhilipp Reisner u32 dp_flags; 1745b411b363SPhilipp Reisner 1746b411b363SPhilipp Reisner if (!get_ldev(mdev)) { 1747b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1748b411b363SPhilipp Reisner if (mdev->peer_seq+1 == be32_to_cpu(p->seq_num)) 1749b411b363SPhilipp Reisner mdev->peer_seq++; 1750b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1751b411b363SPhilipp Reisner 17522b2bf214SLars Ellenberg drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size); 1753b411b363SPhilipp Reisner atomic_inc(&mdev->current_epoch->epoch_size); 1754b411b363SPhilipp Reisner return drbd_drain_block(mdev, data_size); 1755b411b363SPhilipp Reisner } 1756b411b363SPhilipp Reisner 1757b411b363SPhilipp Reisner /* get_ldev(mdev) successful. 1758b411b363SPhilipp Reisner * Corresponding put_ldev done either below (on various errors), 17599c50842aSAndreas Gruenbacher * or in drbd_endio_sec, if we successfully submit the data at 1760b411b363SPhilipp Reisner * the end of this function. */ 1761b411b363SPhilipp Reisner 1762b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1763db830c46SAndreas Gruenbacher peer_req = read_in_block(mdev, p->block_id, sector, data_size); 1764db830c46SAndreas Gruenbacher if (!peer_req) { 1765b411b363SPhilipp Reisner put_ldev(mdev); 176681e84650SAndreas Gruenbacher return false; 1767b411b363SPhilipp Reisner } 1768b411b363SPhilipp Reisner 1769db830c46SAndreas Gruenbacher peer_req->w.cb = e_end_block; 1770b411b363SPhilipp Reisner 1771688593c5SLars Ellenberg dp_flags = be32_to_cpu(p->dp_flags); 1772688593c5SLars Ellenberg rw |= wire_flags_to_bio(mdev, dp_flags); 1773688593c5SLars Ellenberg 1774688593c5SLars Ellenberg if (dp_flags & DP_MAY_SET_IN_SYNC) 1775db830c46SAndreas Gruenbacher peer_req->flags |= EE_MAY_SET_IN_SYNC; 1776688593c5SLars Ellenberg 1777b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1778db830c46SAndreas Gruenbacher peer_req->epoch = mdev->current_epoch; 1779db830c46SAndreas Gruenbacher atomic_inc(&peer_req->epoch->epoch_size); 1780db830c46SAndreas Gruenbacher atomic_inc(&peer_req->epoch->active); 1781b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1782b411b363SPhilipp Reisner 1783b411b363SPhilipp Reisner /* I'm the receiver, I do hold a net_cnt reference. */ 178489e58e75SPhilipp Reisner if (!mdev->tconn->net_conf->two_primaries) { 178587eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1786b411b363SPhilipp Reisner } else { 1787b411b363SPhilipp Reisner /* don't get the req_lock yet, 1788b411b363SPhilipp Reisner * we may sleep in drbd_wait_peer_seq */ 1789db830c46SAndreas Gruenbacher const int size = peer_req->i.size; 179025703f83SPhilipp Reisner const int discard = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags); 1791b411b363SPhilipp Reisner DEFINE_WAIT(wait); 1792b411b363SPhilipp Reisner int first; 1793b411b363SPhilipp Reisner 179489e58e75SPhilipp Reisner D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C); 1795b411b363SPhilipp Reisner 1796b411b363SPhilipp Reisner /* conflict detection and handling: 1797b411b363SPhilipp Reisner * 1. wait on the sequence number, 1798b411b363SPhilipp Reisner * in case this data packet overtook ACK packets. 17995e472264SAndreas Gruenbacher * 2. check for conflicting write requests. 1800b411b363SPhilipp Reisner * 1801b411b363SPhilipp Reisner * Note: for two_primaries, we are protocol C, 1802b411b363SPhilipp Reisner * so there cannot be any request that is DONE 1803b411b363SPhilipp Reisner * but still on the transfer log. 1804b411b363SPhilipp Reisner * 1805b411b363SPhilipp Reisner * if no conflicting request is found: 1806b411b363SPhilipp Reisner * submit. 1807b411b363SPhilipp Reisner * 1808b411b363SPhilipp Reisner * if any conflicting request is found 1809b411b363SPhilipp Reisner * that has not yet been acked, 1810b411b363SPhilipp Reisner * AND I have the "discard concurrent writes" flag: 1811b411b363SPhilipp Reisner * queue (via done_ee) the P_DISCARD_ACK; OUT. 1812b411b363SPhilipp Reisner * 1813b411b363SPhilipp Reisner * if any conflicting request is found: 1814b411b363SPhilipp Reisner * block the receiver, waiting on misc_wait 1815b411b363SPhilipp Reisner * until no more conflicting requests are there, 1816b411b363SPhilipp Reisner * or we get interrupted (disconnect). 1817b411b363SPhilipp Reisner * 1818b411b363SPhilipp Reisner * we do not just write after local io completion of those 1819b411b363SPhilipp Reisner * requests, but only after req is done completely, i.e. 1820b411b363SPhilipp Reisner * we wait for the P_DISCARD_ACK to arrive! 1821b411b363SPhilipp Reisner * 1822b411b363SPhilipp Reisner * then proceed normally, i.e. submit. 1823b411b363SPhilipp Reisner */ 1824b411b363SPhilipp Reisner if (drbd_wait_peer_seq(mdev, be32_to_cpu(p->seq_num))) 1825b411b363SPhilipp Reisner goto out_interrupted; 1826b411b363SPhilipp Reisner 182787eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1828b411b363SPhilipp Reisner 1829b411b363SPhilipp Reisner first = 1; 1830b411b363SPhilipp Reisner for (;;) { 1831de696716SAndreas Gruenbacher struct drbd_interval *i; 1832b411b363SPhilipp Reisner int have_unacked = 0; 1833b411b363SPhilipp Reisner int have_conflict = 0; 1834b411b363SPhilipp Reisner prepare_to_wait(&mdev->misc_wait, &wait, 1835b411b363SPhilipp Reisner TASK_INTERRUPTIBLE); 1836de696716SAndreas Gruenbacher 1837de696716SAndreas Gruenbacher i = drbd_find_overlap(&mdev->write_requests, sector, size); 1838de696716SAndreas Gruenbacher if (i) { 1839b411b363SPhilipp Reisner /* only ALERT on first iteration, 1840b411b363SPhilipp Reisner * we may be woken up early... */ 1841b411b363SPhilipp Reisner if (first) 18425e472264SAndreas Gruenbacher dev_alert(DEV, "%s[%u] Concurrent %s write detected!" 1843b411b363SPhilipp Reisner " new: %llus +%u; pending: %llus +%u\n", 1844b411b363SPhilipp Reisner current->comm, current->pid, 18455e472264SAndreas Gruenbacher i->local ? "local" : "remote", 1846b411b363SPhilipp Reisner (unsigned long long)sector, size, 18475e472264SAndreas Gruenbacher (unsigned long long)i->sector, i->size); 18485e472264SAndreas Gruenbacher 18495e472264SAndreas Gruenbacher if (i->local) { 18505e472264SAndreas Gruenbacher struct drbd_request *req2; 18515e472264SAndreas Gruenbacher 18525e472264SAndreas Gruenbacher req2 = container_of(i, struct drbd_request, i); 1853de696716SAndreas Gruenbacher if (req2->rq_state & RQ_NET_PENDING) 1854b411b363SPhilipp Reisner ++have_unacked; 18555e472264SAndreas Gruenbacher } 1856b411b363SPhilipp Reisner ++have_conflict; 1857b411b363SPhilipp Reisner } 1858b411b363SPhilipp Reisner if (!have_conflict) 1859b411b363SPhilipp Reisner break; 1860b411b363SPhilipp Reisner 1861b411b363SPhilipp Reisner /* Discard Ack only for the _first_ iteration */ 1862b411b363SPhilipp Reisner if (first && discard && have_unacked) { 1863b411b363SPhilipp Reisner dev_alert(DEV, "Concurrent write! [DISCARD BY FLAG] sec=%llus\n", 1864b411b363SPhilipp Reisner (unsigned long long)sector); 1865b411b363SPhilipp Reisner inc_unacked(mdev); 1866db830c46SAndreas Gruenbacher peer_req->w.cb = e_send_discard_ack; 1867db830c46SAndreas Gruenbacher list_add_tail(&peer_req->w.list, &mdev->done_ee); 1868b411b363SPhilipp Reisner 186987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1870b411b363SPhilipp Reisner 1871b411b363SPhilipp Reisner /* we could probably send that P_DISCARD_ACK ourselves, 1872b411b363SPhilipp Reisner * but I don't like the receiver using the msock */ 1873b411b363SPhilipp Reisner 1874b411b363SPhilipp Reisner put_ldev(mdev); 18750625ac19SPhilipp Reisner wake_asender(mdev->tconn); 1876b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 187781e84650SAndreas Gruenbacher return true; 1878b411b363SPhilipp Reisner } 1879b411b363SPhilipp Reisner 1880b411b363SPhilipp Reisner if (signal_pending(current)) { 188187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1882b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 1883b411b363SPhilipp Reisner goto out_interrupted; 1884b411b363SPhilipp Reisner } 1885b411b363SPhilipp Reisner 1886a500c2efSAndreas Gruenbacher /* Indicate to wake up mdev->misc_wait upon completion. */ 188753840641SAndreas Gruenbacher i->waiting = true; 1888a500c2efSAndreas Gruenbacher 188987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1890b411b363SPhilipp Reisner if (first) { 1891b411b363SPhilipp Reisner first = 0; 1892b411b363SPhilipp Reisner dev_alert(DEV, "Concurrent write! [W AFTERWARDS] " 1893b411b363SPhilipp Reisner "sec=%llus\n", (unsigned long long)sector); 1894b411b363SPhilipp Reisner } else if (discard) { 1895b411b363SPhilipp Reisner /* we had none on the first iteration. 1896b411b363SPhilipp Reisner * there must be none now. */ 1897b411b363SPhilipp Reisner D_ASSERT(have_unacked == 0); 1898b411b363SPhilipp Reisner } 1899b411b363SPhilipp Reisner schedule(); 190087eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1901b411b363SPhilipp Reisner } 1902b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 19035e472264SAndreas Gruenbacher 1904db830c46SAndreas Gruenbacher drbd_insert_interval(&mdev->write_requests, &peer_req->i); 1905b411b363SPhilipp Reisner } 1906b411b363SPhilipp Reisner 1907db830c46SAndreas Gruenbacher list_add(&peer_req->w.list, &mdev->active_ee); 190887eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1909b411b363SPhilipp Reisner 191089e58e75SPhilipp Reisner switch (mdev->tconn->net_conf->wire_protocol) { 1911b411b363SPhilipp Reisner case DRBD_PROT_C: 1912b411b363SPhilipp Reisner inc_unacked(mdev); 1913b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_block() 1914b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 1915b411b363SPhilipp Reisner break; 1916b411b363SPhilipp Reisner case DRBD_PROT_B: 1917b411b363SPhilipp Reisner /* I really don't like it that the receiver thread 1918b411b363SPhilipp Reisner * sends on the msock, but anyways */ 1919db830c46SAndreas Gruenbacher drbd_send_ack(mdev, P_RECV_ACK, peer_req); 1920b411b363SPhilipp Reisner break; 1921b411b363SPhilipp Reisner case DRBD_PROT_A: 1922b411b363SPhilipp Reisner /* nothing to do */ 1923b411b363SPhilipp Reisner break; 1924b411b363SPhilipp Reisner } 1925b411b363SPhilipp Reisner 19266719fb03SLars Ellenberg if (mdev->state.pdsk < D_INCONSISTENT) { 1927b411b363SPhilipp Reisner /* In case we have the only disk of the cluster, */ 1928db830c46SAndreas Gruenbacher drbd_set_out_of_sync(mdev, peer_req->i.sector, peer_req->i.size); 1929db830c46SAndreas Gruenbacher peer_req->flags |= EE_CALL_AL_COMPLETE_IO; 1930db830c46SAndreas Gruenbacher peer_req->flags &= ~EE_MAY_SET_IN_SYNC; 1931db830c46SAndreas Gruenbacher drbd_al_begin_io(mdev, peer_req->i.sector); 1932b411b363SPhilipp Reisner } 1933b411b363SPhilipp Reisner 1934db830c46SAndreas Gruenbacher if (drbd_submit_ee(mdev, peer_req, rw, DRBD_FAULT_DT_WR) == 0) 193581e84650SAndreas Gruenbacher return true; 1936b411b363SPhilipp Reisner 193710f6d992SLars Ellenberg /* don't care for the reason here */ 193810f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 193987eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1940db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 1941db830c46SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 194287eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1943db830c46SAndreas Gruenbacher if (peer_req->flags & EE_CALL_AL_COMPLETE_IO) 1944db830c46SAndreas Gruenbacher drbd_al_complete_io(mdev, peer_req->i.sector); 194522cc37a9SLars Ellenberg 1946b411b363SPhilipp Reisner out_interrupted: 1947db830c46SAndreas Gruenbacher drbd_may_finish_epoch(mdev, peer_req->epoch, EV_PUT + EV_CLEANUP); 1948b411b363SPhilipp Reisner put_ldev(mdev); 1949db830c46SAndreas Gruenbacher drbd_free_ee(mdev, peer_req); 195081e84650SAndreas Gruenbacher return false; 1951b411b363SPhilipp Reisner } 1952b411b363SPhilipp Reisner 19530f0601f4SLars Ellenberg /* We may throttle resync, if the lower device seems to be busy, 19540f0601f4SLars Ellenberg * and current sync rate is above c_min_rate. 19550f0601f4SLars Ellenberg * 19560f0601f4SLars Ellenberg * To decide whether or not the lower device is busy, we use a scheme similar 19570f0601f4SLars Ellenberg * to MD RAID is_mddev_idle(): if the partition stats reveal "significant" 19580f0601f4SLars Ellenberg * (more than 64 sectors) of activity we cannot account for with our own resync 19590f0601f4SLars Ellenberg * activity, it obviously is "busy". 19600f0601f4SLars Ellenberg * 19610f0601f4SLars Ellenberg * The current sync rate used here uses only the most recent two step marks, 19620f0601f4SLars Ellenberg * to have a short time average so we can react faster. 19630f0601f4SLars Ellenberg */ 1964e3555d85SPhilipp Reisner int drbd_rs_should_slow_down(struct drbd_conf *mdev, sector_t sector) 19650f0601f4SLars Ellenberg { 19660f0601f4SLars Ellenberg struct gendisk *disk = mdev->ldev->backing_bdev->bd_contains->bd_disk; 19670f0601f4SLars Ellenberg unsigned long db, dt, dbdt; 1968e3555d85SPhilipp Reisner struct lc_element *tmp; 19690f0601f4SLars Ellenberg int curr_events; 19700f0601f4SLars Ellenberg int throttle = 0; 19710f0601f4SLars Ellenberg 19720f0601f4SLars Ellenberg /* feature disabled? */ 19730f0601f4SLars Ellenberg if (mdev->sync_conf.c_min_rate == 0) 19740f0601f4SLars Ellenberg return 0; 19750f0601f4SLars Ellenberg 1976e3555d85SPhilipp Reisner spin_lock_irq(&mdev->al_lock); 1977e3555d85SPhilipp Reisner tmp = lc_find(mdev->resync, BM_SECT_TO_EXT(sector)); 1978e3555d85SPhilipp Reisner if (tmp) { 1979e3555d85SPhilipp Reisner struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); 1980e3555d85SPhilipp Reisner if (test_bit(BME_PRIORITY, &bm_ext->flags)) { 1981e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 1982e3555d85SPhilipp Reisner return 0; 1983e3555d85SPhilipp Reisner } 1984e3555d85SPhilipp Reisner /* Do not slow down if app IO is already waiting for this extent */ 1985e3555d85SPhilipp Reisner } 1986e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 1987e3555d85SPhilipp Reisner 19880f0601f4SLars Ellenberg curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + 19890f0601f4SLars Ellenberg (int)part_stat_read(&disk->part0, sectors[1]) - 19900f0601f4SLars Ellenberg atomic_read(&mdev->rs_sect_ev); 1991e3555d85SPhilipp Reisner 19920f0601f4SLars Ellenberg if (!mdev->rs_last_events || curr_events - mdev->rs_last_events > 64) { 19930f0601f4SLars Ellenberg unsigned long rs_left; 19940f0601f4SLars Ellenberg int i; 19950f0601f4SLars Ellenberg 19960f0601f4SLars Ellenberg mdev->rs_last_events = curr_events; 19970f0601f4SLars Ellenberg 19980f0601f4SLars Ellenberg /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, 19990f0601f4SLars Ellenberg * approx. */ 20002649f080SLars Ellenberg i = (mdev->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; 20012649f080SLars Ellenberg 20022649f080SLars Ellenberg if (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T) 20032649f080SLars Ellenberg rs_left = mdev->ov_left; 20042649f080SLars Ellenberg else 20050f0601f4SLars Ellenberg rs_left = drbd_bm_total_weight(mdev) - mdev->rs_failed; 20060f0601f4SLars Ellenberg 20070f0601f4SLars Ellenberg dt = ((long)jiffies - (long)mdev->rs_mark_time[i]) / HZ; 20080f0601f4SLars Ellenberg if (!dt) 20090f0601f4SLars Ellenberg dt++; 20100f0601f4SLars Ellenberg db = mdev->rs_mark_left[i] - rs_left; 20110f0601f4SLars Ellenberg dbdt = Bit2KB(db/dt); 20120f0601f4SLars Ellenberg 20130f0601f4SLars Ellenberg if (dbdt > mdev->sync_conf.c_min_rate) 20140f0601f4SLars Ellenberg throttle = 1; 20150f0601f4SLars Ellenberg } 20160f0601f4SLars Ellenberg return throttle; 20170f0601f4SLars Ellenberg } 20180f0601f4SLars Ellenberg 20190f0601f4SLars Ellenberg 2020d8763023SAndreas Gruenbacher static int receive_DataRequest(struct drbd_conf *mdev, enum drbd_packet cmd, 2021d8763023SAndreas Gruenbacher unsigned int digest_size) 2022b411b363SPhilipp Reisner { 2023b411b363SPhilipp Reisner sector_t sector; 2024b411b363SPhilipp Reisner const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 2025db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 2026b411b363SPhilipp Reisner struct digest_info *di = NULL; 2027b18b37beSPhilipp Reisner int size, verb; 2028b411b363SPhilipp Reisner unsigned int fault_type; 2029e42325a5SPhilipp Reisner struct p_block_req *p = &mdev->tconn->data.rbuf.block_req; 2030b411b363SPhilipp Reisner 2031b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 2032b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 2033b411b363SPhilipp Reisner 20341816a2b4SLars Ellenberg if (size <= 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_BIO_SIZE) { 2035b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 2036b411b363SPhilipp Reisner (unsigned long long)sector, size); 203781e84650SAndreas Gruenbacher return false; 2038b411b363SPhilipp Reisner } 2039b411b363SPhilipp Reisner if (sector + (size>>9) > capacity) { 2040b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 2041b411b363SPhilipp Reisner (unsigned long long)sector, size); 204281e84650SAndreas Gruenbacher return false; 2043b411b363SPhilipp Reisner } 2044b411b363SPhilipp Reisner 2045b411b363SPhilipp Reisner if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) { 2046b18b37beSPhilipp Reisner verb = 1; 2047b18b37beSPhilipp Reisner switch (cmd) { 2048b18b37beSPhilipp Reisner case P_DATA_REQUEST: 2049b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_DREPLY, p); 2050b18b37beSPhilipp Reisner break; 2051b18b37beSPhilipp Reisner case P_RS_DATA_REQUEST: 2052b18b37beSPhilipp Reisner case P_CSUM_RS_REQUEST: 2053b18b37beSPhilipp Reisner case P_OV_REQUEST: 2054b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_RS_DREPLY , p); 2055b18b37beSPhilipp Reisner break; 2056b18b37beSPhilipp Reisner case P_OV_REPLY: 2057b18b37beSPhilipp Reisner verb = 0; 2058b18b37beSPhilipp Reisner dec_rs_pending(mdev); 2059b18b37beSPhilipp Reisner drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, ID_IN_SYNC); 2060b18b37beSPhilipp Reisner break; 2061b18b37beSPhilipp Reisner default: 2062b18b37beSPhilipp Reisner dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n", 2063b18b37beSPhilipp Reisner cmdname(cmd)); 2064b18b37beSPhilipp Reisner } 2065b18b37beSPhilipp Reisner if (verb && __ratelimit(&drbd_ratelimit_state)) 2066b411b363SPhilipp Reisner dev_err(DEV, "Can not satisfy peer's read request, " 2067b411b363SPhilipp Reisner "no local data.\n"); 2068b18b37beSPhilipp Reisner 2069a821cc4aSLars Ellenberg /* drain possibly payload */ 2070a821cc4aSLars Ellenberg return drbd_drain_block(mdev, digest_size); 2071b411b363SPhilipp Reisner } 2072b411b363SPhilipp Reisner 2073b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 2074b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 2075b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 2076db830c46SAndreas Gruenbacher peer_req = drbd_alloc_ee(mdev, p->block_id, sector, size, GFP_NOIO); 2077db830c46SAndreas Gruenbacher if (!peer_req) { 2078b411b363SPhilipp Reisner put_ldev(mdev); 207981e84650SAndreas Gruenbacher return false; 2080b411b363SPhilipp Reisner } 2081b411b363SPhilipp Reisner 208202918be2SPhilipp Reisner switch (cmd) { 2083b411b363SPhilipp Reisner case P_DATA_REQUEST: 2084db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_data_req; 2085b411b363SPhilipp Reisner fault_type = DRBD_FAULT_DT_RD; 208680a40e43SLars Ellenberg /* application IO, don't drbd_rs_begin_io */ 208780a40e43SLars Ellenberg goto submit; 208880a40e43SLars Ellenberg 2089b411b363SPhilipp Reisner case P_RS_DATA_REQUEST: 2090db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_rsdata_req; 2091b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 20925f9915bbSLars Ellenberg /* used in the sector offset progress display */ 20935f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 2094b411b363SPhilipp Reisner break; 2095b411b363SPhilipp Reisner 2096b411b363SPhilipp Reisner case P_OV_REPLY: 2097b411b363SPhilipp Reisner case P_CSUM_RS_REQUEST: 2098b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2099b411b363SPhilipp Reisner di = kmalloc(sizeof(*di) + digest_size, GFP_NOIO); 2100b411b363SPhilipp Reisner if (!di) 2101b411b363SPhilipp Reisner goto out_free_e; 2102b411b363SPhilipp Reisner 2103b411b363SPhilipp Reisner di->digest_size = digest_size; 2104b411b363SPhilipp Reisner di->digest = (((char *)di)+sizeof(struct digest_info)); 2105b411b363SPhilipp Reisner 2106db830c46SAndreas Gruenbacher peer_req->digest = di; 2107db830c46SAndreas Gruenbacher peer_req->flags |= EE_HAS_DIGEST; 2108c36c3cedSLars Ellenberg 2109de0ff338SPhilipp Reisner if (drbd_recv(mdev->tconn, di->digest, digest_size) != digest_size) 2110b411b363SPhilipp Reisner goto out_free_e; 2111b411b363SPhilipp Reisner 211202918be2SPhilipp Reisner if (cmd == P_CSUM_RS_REQUEST) { 211331890f4aSPhilipp Reisner D_ASSERT(mdev->tconn->agreed_pro_version >= 89); 2114db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_csum_rs_req; 21155f9915bbSLars Ellenberg /* used in the sector offset progress display */ 21165f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 211702918be2SPhilipp Reisner } else if (cmd == P_OV_REPLY) { 21182649f080SLars Ellenberg /* track progress, we may need to throttle */ 21192649f080SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_in); 2120db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_ov_reply; 2121b411b363SPhilipp Reisner dec_rs_pending(mdev); 21220f0601f4SLars Ellenberg /* drbd_rs_begin_io done when we sent this request, 21230f0601f4SLars Ellenberg * but accounting still needs to be done. */ 21240f0601f4SLars Ellenberg goto submit_for_resync; 2125b411b363SPhilipp Reisner } 2126b411b363SPhilipp Reisner break; 2127b411b363SPhilipp Reisner 2128b411b363SPhilipp Reisner case P_OV_REQUEST: 2129b411b363SPhilipp Reisner if (mdev->ov_start_sector == ~(sector_t)0 && 213031890f4aSPhilipp Reisner mdev->tconn->agreed_pro_version >= 90) { 2131de228bbaSLars Ellenberg unsigned long now = jiffies; 2132de228bbaSLars Ellenberg int i; 2133b411b363SPhilipp Reisner mdev->ov_start_sector = sector; 2134b411b363SPhilipp Reisner mdev->ov_position = sector; 213530b743a2SLars Ellenberg mdev->ov_left = drbd_bm_bits(mdev) - BM_SECT_TO_BIT(sector); 213630b743a2SLars Ellenberg mdev->rs_total = mdev->ov_left; 2137de228bbaSLars Ellenberg for (i = 0; i < DRBD_SYNC_MARKS; i++) { 2138de228bbaSLars Ellenberg mdev->rs_mark_left[i] = mdev->ov_left; 2139de228bbaSLars Ellenberg mdev->rs_mark_time[i] = now; 2140de228bbaSLars Ellenberg } 2141b411b363SPhilipp Reisner dev_info(DEV, "Online Verify start sector: %llu\n", 2142b411b363SPhilipp Reisner (unsigned long long)sector); 2143b411b363SPhilipp Reisner } 2144db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_ov_req; 2145b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2146b411b363SPhilipp Reisner break; 2147b411b363SPhilipp Reisner 2148b411b363SPhilipp Reisner default: 2149b411b363SPhilipp Reisner dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n", 215002918be2SPhilipp Reisner cmdname(cmd)); 2151b411b363SPhilipp Reisner fault_type = DRBD_FAULT_MAX; 215280a40e43SLars Ellenberg goto out_free_e; 2153b411b363SPhilipp Reisner } 2154b411b363SPhilipp Reisner 21550f0601f4SLars Ellenberg /* Throttle, drbd_rs_begin_io and submit should become asynchronous 21560f0601f4SLars Ellenberg * wrt the receiver, but it is not as straightforward as it may seem. 21570f0601f4SLars Ellenberg * Various places in the resync start and stop logic assume resync 21580f0601f4SLars Ellenberg * requests are processed in order, requeuing this on the worker thread 21590f0601f4SLars Ellenberg * introduces a bunch of new code for synchronization between threads. 21600f0601f4SLars Ellenberg * 21610f0601f4SLars Ellenberg * Unlimited throttling before drbd_rs_begin_io may stall the resync 21620f0601f4SLars Ellenberg * "forever", throttling after drbd_rs_begin_io will lock that extent 21630f0601f4SLars Ellenberg * for application writes for the same time. For now, just throttle 21640f0601f4SLars Ellenberg * here, where the rest of the code expects the receiver to sleep for 21650f0601f4SLars Ellenberg * a while, anyways. 21660f0601f4SLars Ellenberg */ 2167b411b363SPhilipp Reisner 21680f0601f4SLars Ellenberg /* Throttle before drbd_rs_begin_io, as that locks out application IO; 21690f0601f4SLars Ellenberg * this defers syncer requests for some time, before letting at least 21700f0601f4SLars Ellenberg * on request through. The resync controller on the receiving side 21710f0601f4SLars Ellenberg * will adapt to the incoming rate accordingly. 21720f0601f4SLars Ellenberg * 21730f0601f4SLars Ellenberg * We cannot throttle here if remote is Primary/SyncTarget: 21740f0601f4SLars Ellenberg * we would also throttle its application reads. 21750f0601f4SLars Ellenberg * In that case, throttling is done on the SyncTarget only. 21760f0601f4SLars Ellenberg */ 2177e3555d85SPhilipp Reisner if (mdev->state.peer != R_PRIMARY && drbd_rs_should_slow_down(mdev, sector)) 2178e3555d85SPhilipp Reisner schedule_timeout_uninterruptible(HZ/10); 2179e3555d85SPhilipp Reisner if (drbd_rs_begin_io(mdev, sector)) 218080a40e43SLars Ellenberg goto out_free_e; 2181b411b363SPhilipp Reisner 21820f0601f4SLars Ellenberg submit_for_resync: 21830f0601f4SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_ev); 21840f0601f4SLars Ellenberg 218580a40e43SLars Ellenberg submit: 2186b411b363SPhilipp Reisner inc_unacked(mdev); 218787eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2188db830c46SAndreas Gruenbacher list_add_tail(&peer_req->w.list, &mdev->read_ee); 218987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 2190b411b363SPhilipp Reisner 2191db830c46SAndreas Gruenbacher if (drbd_submit_ee(mdev, peer_req, READ, fault_type) == 0) 219281e84650SAndreas Gruenbacher return true; 2193b411b363SPhilipp Reisner 219410f6d992SLars Ellenberg /* don't care for the reason here */ 219510f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 219687eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2197db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 219887eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 219922cc37a9SLars Ellenberg /* no drbd_rs_complete_io(), we are dropping the connection anyways */ 220022cc37a9SLars Ellenberg 2201b411b363SPhilipp Reisner out_free_e: 2202b411b363SPhilipp Reisner put_ldev(mdev); 2203db830c46SAndreas Gruenbacher drbd_free_ee(mdev, peer_req); 220481e84650SAndreas Gruenbacher return false; 2205b411b363SPhilipp Reisner } 2206b411b363SPhilipp Reisner 2207b411b363SPhilipp Reisner static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local) 2208b411b363SPhilipp Reisner { 2209b411b363SPhilipp Reisner int self, peer, rv = -100; 2210b411b363SPhilipp Reisner unsigned long ch_self, ch_peer; 2211b411b363SPhilipp Reisner 2212b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & 1; 2213b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & 1; 2214b411b363SPhilipp Reisner 2215b411b363SPhilipp Reisner ch_peer = mdev->p_uuid[UI_SIZE]; 2216b411b363SPhilipp Reisner ch_self = mdev->comm_bm_set; 2217b411b363SPhilipp Reisner 221889e58e75SPhilipp Reisner switch (mdev->tconn->net_conf->after_sb_0p) { 2219b411b363SPhilipp Reisner case ASB_CONSENSUS: 2220b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2221b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2222b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2223b411b363SPhilipp Reisner break; 2224b411b363SPhilipp Reisner case ASB_DISCONNECT: 2225b411b363SPhilipp Reisner break; 2226b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2227b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2228b411b363SPhilipp Reisner rv = -1; 2229b411b363SPhilipp Reisner break; 2230b411b363SPhilipp Reisner } 2231b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2232b411b363SPhilipp Reisner rv = 1; 2233b411b363SPhilipp Reisner break; 2234b411b363SPhilipp Reisner } 2235b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2236b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2237b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2238b411b363SPhilipp Reisner rv = 1; 2239b411b363SPhilipp Reisner break; 2240b411b363SPhilipp Reisner } 2241b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2242b411b363SPhilipp Reisner rv = -1; 2243b411b363SPhilipp Reisner break; 2244b411b363SPhilipp Reisner } 2245b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2246ad19bf6eSLars Ellenberg dev_warn(DEV, "Discard younger/older primary did not find a decision\n" 2247b411b363SPhilipp Reisner "Using discard-least-changes instead\n"); 2248b411b363SPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2249b411b363SPhilipp Reisner if (ch_peer == 0 && ch_self == 0) { 225025703f83SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) 2251b411b363SPhilipp Reisner ? -1 : 1; 2252b411b363SPhilipp Reisner break; 2253b411b363SPhilipp Reisner } else { 2254b411b363SPhilipp Reisner if (ch_peer == 0) { rv = 1; break; } 2255b411b363SPhilipp Reisner if (ch_self == 0) { rv = -1; break; } 2256b411b363SPhilipp Reisner } 225789e58e75SPhilipp Reisner if (mdev->tconn->net_conf->after_sb_0p == ASB_DISCARD_ZERO_CHG) 2258b411b363SPhilipp Reisner break; 2259b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2260b411b363SPhilipp Reisner if (ch_self < ch_peer) 2261b411b363SPhilipp Reisner rv = -1; 2262b411b363SPhilipp Reisner else if (ch_self > ch_peer) 2263b411b363SPhilipp Reisner rv = 1; 2264b411b363SPhilipp Reisner else /* ( ch_self == ch_peer ) */ 2265b411b363SPhilipp Reisner /* Well, then use something else. */ 226625703f83SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) 2267b411b363SPhilipp Reisner ? -1 : 1; 2268b411b363SPhilipp Reisner break; 2269b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2270b411b363SPhilipp Reisner rv = -1; 2271b411b363SPhilipp Reisner break; 2272b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2273b411b363SPhilipp Reisner rv = 1; 2274b411b363SPhilipp Reisner } 2275b411b363SPhilipp Reisner 2276b411b363SPhilipp Reisner return rv; 2277b411b363SPhilipp Reisner } 2278b411b363SPhilipp Reisner 2279b411b363SPhilipp Reisner static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local) 2280b411b363SPhilipp Reisner { 22816184ea21SAndreas Gruenbacher int hg, rv = -100; 2282b411b363SPhilipp Reisner 228389e58e75SPhilipp Reisner switch (mdev->tconn->net_conf->after_sb_1p) { 2284b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2285b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2286b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2287b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2288b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2289b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2290b411b363SPhilipp Reisner break; 2291b411b363SPhilipp Reisner case ASB_DISCONNECT: 2292b411b363SPhilipp Reisner break; 2293b411b363SPhilipp Reisner case ASB_CONSENSUS: 2294b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2295b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_SECONDARY) 2296b411b363SPhilipp Reisner rv = hg; 2297b411b363SPhilipp Reisner if (hg == 1 && mdev->state.role == R_PRIMARY) 2298b411b363SPhilipp Reisner rv = hg; 2299b411b363SPhilipp Reisner break; 2300b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2301b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2302b411b363SPhilipp Reisner break; 2303b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2304b411b363SPhilipp Reisner return mdev->state.role == R_PRIMARY ? 1 : -1; 2305b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2306b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2307b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_PRIMARY) { 2308bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2309bb437946SAndreas Gruenbacher 2310bb437946SAndreas Gruenbacher drbd_set_role(mdev, R_SECONDARY, 0); 2311b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2312b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2313b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2314bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2315bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2316b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2317b411b363SPhilipp Reisner } else { 2318b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2319b411b363SPhilipp Reisner rv = hg; 2320b411b363SPhilipp Reisner } 2321b411b363SPhilipp Reisner } else 2322b411b363SPhilipp Reisner rv = hg; 2323b411b363SPhilipp Reisner } 2324b411b363SPhilipp Reisner 2325b411b363SPhilipp Reisner return rv; 2326b411b363SPhilipp Reisner } 2327b411b363SPhilipp Reisner 2328b411b363SPhilipp Reisner static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local) 2329b411b363SPhilipp Reisner { 23306184ea21SAndreas Gruenbacher int hg, rv = -100; 2331b411b363SPhilipp Reisner 233289e58e75SPhilipp Reisner switch (mdev->tconn->net_conf->after_sb_2p) { 2333b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2334b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2335b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2336b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2337b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2338b411b363SPhilipp Reisner case ASB_CONSENSUS: 2339b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2340b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2341b411b363SPhilipp Reisner break; 2342b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2343b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2344b411b363SPhilipp Reisner break; 2345b411b363SPhilipp Reisner case ASB_DISCONNECT: 2346b411b363SPhilipp Reisner break; 2347b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2348b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2349b411b363SPhilipp Reisner if (hg == -1) { 2350bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2351bb437946SAndreas Gruenbacher 2352b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2353b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2354b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2355bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2356bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2357b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2358b411b363SPhilipp Reisner } else { 2359b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2360b411b363SPhilipp Reisner rv = hg; 2361b411b363SPhilipp Reisner } 2362b411b363SPhilipp Reisner } else 2363b411b363SPhilipp Reisner rv = hg; 2364b411b363SPhilipp Reisner } 2365b411b363SPhilipp Reisner 2366b411b363SPhilipp Reisner return rv; 2367b411b363SPhilipp Reisner } 2368b411b363SPhilipp Reisner 2369b411b363SPhilipp Reisner static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid, 2370b411b363SPhilipp Reisner u64 bits, u64 flags) 2371b411b363SPhilipp Reisner { 2372b411b363SPhilipp Reisner if (!uuid) { 2373b411b363SPhilipp Reisner dev_info(DEV, "%s uuid info vanished while I was looking!\n", text); 2374b411b363SPhilipp Reisner return; 2375b411b363SPhilipp Reisner } 2376b411b363SPhilipp Reisner dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", 2377b411b363SPhilipp Reisner text, 2378b411b363SPhilipp Reisner (unsigned long long)uuid[UI_CURRENT], 2379b411b363SPhilipp Reisner (unsigned long long)uuid[UI_BITMAP], 2380b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_START], 2381b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_END], 2382b411b363SPhilipp Reisner (unsigned long long)bits, 2383b411b363SPhilipp Reisner (unsigned long long)flags); 2384b411b363SPhilipp Reisner } 2385b411b363SPhilipp Reisner 2386b411b363SPhilipp Reisner /* 2387b411b363SPhilipp Reisner 100 after split brain try auto recover 2388b411b363SPhilipp Reisner 2 C_SYNC_SOURCE set BitMap 2389b411b363SPhilipp Reisner 1 C_SYNC_SOURCE use BitMap 2390b411b363SPhilipp Reisner 0 no Sync 2391b411b363SPhilipp Reisner -1 C_SYNC_TARGET use BitMap 2392b411b363SPhilipp Reisner -2 C_SYNC_TARGET set BitMap 2393b411b363SPhilipp Reisner -100 after split brain, disconnect 2394b411b363SPhilipp Reisner -1000 unrelated data 23954a23f264SPhilipp Reisner -1091 requires proto 91 23964a23f264SPhilipp Reisner -1096 requires proto 96 2397b411b363SPhilipp Reisner */ 2398b411b363SPhilipp Reisner static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local) 2399b411b363SPhilipp Reisner { 2400b411b363SPhilipp Reisner u64 self, peer; 2401b411b363SPhilipp Reisner int i, j; 2402b411b363SPhilipp Reisner 2403b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2404b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2405b411b363SPhilipp Reisner 2406b411b363SPhilipp Reisner *rule_nr = 10; 2407b411b363SPhilipp Reisner if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) 2408b411b363SPhilipp Reisner return 0; 2409b411b363SPhilipp Reisner 2410b411b363SPhilipp Reisner *rule_nr = 20; 2411b411b363SPhilipp Reisner if ((self == UUID_JUST_CREATED || self == (u64)0) && 2412b411b363SPhilipp Reisner peer != UUID_JUST_CREATED) 2413b411b363SPhilipp Reisner return -2; 2414b411b363SPhilipp Reisner 2415b411b363SPhilipp Reisner *rule_nr = 30; 2416b411b363SPhilipp Reisner if (self != UUID_JUST_CREATED && 2417b411b363SPhilipp Reisner (peer == UUID_JUST_CREATED || peer == (u64)0)) 2418b411b363SPhilipp Reisner return 2; 2419b411b363SPhilipp Reisner 2420b411b363SPhilipp Reisner if (self == peer) { 2421b411b363SPhilipp Reisner int rct, dc; /* roles at crash time */ 2422b411b363SPhilipp Reisner 2423b411b363SPhilipp Reisner if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) { 2424b411b363SPhilipp Reisner 242531890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 24264a23f264SPhilipp Reisner return -1091; 2427b411b363SPhilipp Reisner 2428b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) && 2429b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { 2430b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n"); 2431b411b363SPhilipp Reisner drbd_uuid_set_bm(mdev, 0UL); 2432b411b363SPhilipp Reisner 2433b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2434b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2435b411b363SPhilipp Reisner *rule_nr = 34; 2436b411b363SPhilipp Reisner } else { 2437b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n"); 2438b411b363SPhilipp Reisner *rule_nr = 36; 2439b411b363SPhilipp Reisner } 2440b411b363SPhilipp Reisner 2441b411b363SPhilipp Reisner return 1; 2442b411b363SPhilipp Reisner } 2443b411b363SPhilipp Reisner 2444b411b363SPhilipp Reisner if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) { 2445b411b363SPhilipp Reisner 244631890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 24474a23f264SPhilipp Reisner return -1091; 2448b411b363SPhilipp Reisner 2449b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) && 2450b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) { 2451b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); 2452b411b363SPhilipp Reisner 2453b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START]; 2454b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP]; 2455b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = 0UL; 2456b411b363SPhilipp Reisner 2457b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2458b411b363SPhilipp Reisner *rule_nr = 35; 2459b411b363SPhilipp Reisner } else { 2460b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n"); 2461b411b363SPhilipp Reisner *rule_nr = 37; 2462b411b363SPhilipp Reisner } 2463b411b363SPhilipp Reisner 2464b411b363SPhilipp Reisner return -1; 2465b411b363SPhilipp Reisner } 2466b411b363SPhilipp Reisner 2467b411b363SPhilipp Reisner /* Common power [off|failure] */ 2468b411b363SPhilipp Reisner rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) + 2469b411b363SPhilipp Reisner (mdev->p_uuid[UI_FLAGS] & 2); 2470b411b363SPhilipp Reisner /* lowest bit is set when we were primary, 2471b411b363SPhilipp Reisner * next bit (weight 2) is set when peer was primary */ 2472b411b363SPhilipp Reisner *rule_nr = 40; 2473b411b363SPhilipp Reisner 2474b411b363SPhilipp Reisner switch (rct) { 2475b411b363SPhilipp Reisner case 0: /* !self_pri && !peer_pri */ return 0; 2476b411b363SPhilipp Reisner case 1: /* self_pri && !peer_pri */ return 1; 2477b411b363SPhilipp Reisner case 2: /* !self_pri && peer_pri */ return -1; 2478b411b363SPhilipp Reisner case 3: /* self_pri && peer_pri */ 247925703f83SPhilipp Reisner dc = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags); 2480b411b363SPhilipp Reisner return dc ? -1 : 1; 2481b411b363SPhilipp Reisner } 2482b411b363SPhilipp Reisner } 2483b411b363SPhilipp Reisner 2484b411b363SPhilipp Reisner *rule_nr = 50; 2485b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2486b411b363SPhilipp Reisner if (self == peer) 2487b411b363SPhilipp Reisner return -1; 2488b411b363SPhilipp Reisner 2489b411b363SPhilipp Reisner *rule_nr = 51; 2490b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); 2491b411b363SPhilipp Reisner if (self == peer) { 249231890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 96 ? 24934a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == 24944a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) : 24954a23f264SPhilipp Reisner peer + UUID_NEW_BM_OFFSET == (mdev->p_uuid[UI_BITMAP] & ~((u64)1))) { 2496b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2497b411b363SPhilipp Reisner resync as sync source modifications of the peer's UUIDs. */ 2498b411b363SPhilipp Reisner 249931890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 25004a23f264SPhilipp Reisner return -1091; 2501b411b363SPhilipp Reisner 2502b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START]; 2503b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1]; 25044a23f264SPhilipp Reisner 25054a23f264SPhilipp Reisner dev_info(DEV, "Did not got last syncUUID packet, corrected:\n"); 25064a23f264SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 25074a23f264SPhilipp Reisner 2508b411b363SPhilipp Reisner return -1; 2509b411b363SPhilipp Reisner } 2510b411b363SPhilipp Reisner } 2511b411b363SPhilipp Reisner 2512b411b363SPhilipp Reisner *rule_nr = 60; 2513b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2514b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2515b411b363SPhilipp Reisner peer = mdev->p_uuid[i] & ~((u64)1); 2516b411b363SPhilipp Reisner if (self == peer) 2517b411b363SPhilipp Reisner return -2; 2518b411b363SPhilipp Reisner } 2519b411b363SPhilipp Reisner 2520b411b363SPhilipp Reisner *rule_nr = 70; 2521b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2522b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2523b411b363SPhilipp Reisner if (self == peer) 2524b411b363SPhilipp Reisner return 1; 2525b411b363SPhilipp Reisner 2526b411b363SPhilipp Reisner *rule_nr = 71; 2527b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); 2528b411b363SPhilipp Reisner if (self == peer) { 252931890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 96 ? 25304a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == 25314a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) : 25324a23f264SPhilipp Reisner self + UUID_NEW_BM_OFFSET == (mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) { 2533b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2534b411b363SPhilipp Reisner resync as sync source modifications of our UUIDs. */ 2535b411b363SPhilipp Reisner 253631890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 25374a23f264SPhilipp Reisner return -1091; 2538b411b363SPhilipp Reisner 2539b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]); 2540b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]); 2541b411b363SPhilipp Reisner 25424a23f264SPhilipp Reisner dev_info(DEV, "Last syncUUID did not get through, corrected:\n"); 2543b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2544b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2545b411b363SPhilipp Reisner 2546b411b363SPhilipp Reisner return 1; 2547b411b363SPhilipp Reisner } 2548b411b363SPhilipp Reisner } 2549b411b363SPhilipp Reisner 2550b411b363SPhilipp Reisner 2551b411b363SPhilipp Reisner *rule_nr = 80; 2552d8c2a36bSPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2553b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2554b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2555b411b363SPhilipp Reisner if (self == peer) 2556b411b363SPhilipp Reisner return 2; 2557b411b363SPhilipp Reisner } 2558b411b363SPhilipp Reisner 2559b411b363SPhilipp Reisner *rule_nr = 90; 2560b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2561b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2562b411b363SPhilipp Reisner if (self == peer && self != ((u64)0)) 2563b411b363SPhilipp Reisner return 100; 2564b411b363SPhilipp Reisner 2565b411b363SPhilipp Reisner *rule_nr = 100; 2566b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2567b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2568b411b363SPhilipp Reisner for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { 2569b411b363SPhilipp Reisner peer = mdev->p_uuid[j] & ~((u64)1); 2570b411b363SPhilipp Reisner if (self == peer) 2571b411b363SPhilipp Reisner return -100; 2572b411b363SPhilipp Reisner } 2573b411b363SPhilipp Reisner } 2574b411b363SPhilipp Reisner 2575b411b363SPhilipp Reisner return -1000; 2576b411b363SPhilipp Reisner } 2577b411b363SPhilipp Reisner 2578b411b363SPhilipp Reisner /* drbd_sync_handshake() returns the new conn state on success, or 2579b411b363SPhilipp Reisner CONN_MASK (-1) on failure. 2580b411b363SPhilipp Reisner */ 2581b411b363SPhilipp Reisner static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role, 2582b411b363SPhilipp Reisner enum drbd_disk_state peer_disk) __must_hold(local) 2583b411b363SPhilipp Reisner { 2584b411b363SPhilipp Reisner int hg, rule_nr; 2585b411b363SPhilipp Reisner enum drbd_conns rv = C_MASK; 2586b411b363SPhilipp Reisner enum drbd_disk_state mydisk; 2587b411b363SPhilipp Reisner 2588b411b363SPhilipp Reisner mydisk = mdev->state.disk; 2589b411b363SPhilipp Reisner if (mydisk == D_NEGOTIATING) 2590b411b363SPhilipp Reisner mydisk = mdev->new_state_tmp.disk; 2591b411b363SPhilipp Reisner 2592b411b363SPhilipp Reisner dev_info(DEV, "drbd_sync_handshake:\n"); 2593b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0); 2594b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, 2595b411b363SPhilipp Reisner mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2596b411b363SPhilipp Reisner 2597b411b363SPhilipp Reisner hg = drbd_uuid_compare(mdev, &rule_nr); 2598b411b363SPhilipp Reisner 2599b411b363SPhilipp Reisner dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr); 2600b411b363SPhilipp Reisner 2601b411b363SPhilipp Reisner if (hg == -1000) { 2602b411b363SPhilipp Reisner dev_alert(DEV, "Unrelated data, aborting!\n"); 2603b411b363SPhilipp Reisner return C_MASK; 2604b411b363SPhilipp Reisner } 26054a23f264SPhilipp Reisner if (hg < -1000) { 26064a23f264SPhilipp Reisner dev_alert(DEV, "To resolve this both sides have to support at least protocol %d\n", -hg - 1000); 2607b411b363SPhilipp Reisner return C_MASK; 2608b411b363SPhilipp Reisner } 2609b411b363SPhilipp Reisner 2610b411b363SPhilipp Reisner if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || 2611b411b363SPhilipp Reisner (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { 2612b411b363SPhilipp Reisner int f = (hg == -100) || abs(hg) == 2; 2613b411b363SPhilipp Reisner hg = mydisk > D_INCONSISTENT ? 1 : -1; 2614b411b363SPhilipp Reisner if (f) 2615b411b363SPhilipp Reisner hg = hg*2; 2616b411b363SPhilipp Reisner dev_info(DEV, "Becoming sync %s due to disk states.\n", 2617b411b363SPhilipp Reisner hg > 0 ? "source" : "target"); 2618b411b363SPhilipp Reisner } 2619b411b363SPhilipp Reisner 26203a11a487SAdam Gandelman if (abs(hg) == 100) 26213a11a487SAdam Gandelman drbd_khelper(mdev, "initial-split-brain"); 26223a11a487SAdam Gandelman 262389e58e75SPhilipp Reisner if (hg == 100 || (hg == -100 && mdev->tconn->net_conf->always_asbp)) { 2624b411b363SPhilipp Reisner int pcount = (mdev->state.role == R_PRIMARY) 2625b411b363SPhilipp Reisner + (peer_role == R_PRIMARY); 2626b411b363SPhilipp Reisner int forced = (hg == -100); 2627b411b363SPhilipp Reisner 2628b411b363SPhilipp Reisner switch (pcount) { 2629b411b363SPhilipp Reisner case 0: 2630b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2631b411b363SPhilipp Reisner break; 2632b411b363SPhilipp Reisner case 1: 2633b411b363SPhilipp Reisner hg = drbd_asb_recover_1p(mdev); 2634b411b363SPhilipp Reisner break; 2635b411b363SPhilipp Reisner case 2: 2636b411b363SPhilipp Reisner hg = drbd_asb_recover_2p(mdev); 2637b411b363SPhilipp Reisner break; 2638b411b363SPhilipp Reisner } 2639b411b363SPhilipp Reisner if (abs(hg) < 100) { 2640b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, %d primaries, " 2641b411b363SPhilipp Reisner "automatically solved. Sync from %s node\n", 2642b411b363SPhilipp Reisner pcount, (hg < 0) ? "peer" : "this"); 2643b411b363SPhilipp Reisner if (forced) { 2644b411b363SPhilipp Reisner dev_warn(DEV, "Doing a full sync, since" 2645b411b363SPhilipp Reisner " UUIDs where ambiguous.\n"); 2646b411b363SPhilipp Reisner hg = hg*2; 2647b411b363SPhilipp Reisner } 2648b411b363SPhilipp Reisner } 2649b411b363SPhilipp Reisner } 2650b411b363SPhilipp Reisner 2651b411b363SPhilipp Reisner if (hg == -100) { 265289e58e75SPhilipp Reisner if (mdev->tconn->net_conf->want_lose && !(mdev->p_uuid[UI_FLAGS]&1)) 2653b411b363SPhilipp Reisner hg = -1; 265489e58e75SPhilipp Reisner if (!mdev->tconn->net_conf->want_lose && (mdev->p_uuid[UI_FLAGS]&1)) 2655b411b363SPhilipp Reisner hg = 1; 2656b411b363SPhilipp Reisner 2657b411b363SPhilipp Reisner if (abs(hg) < 100) 2658b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, manually solved. " 2659b411b363SPhilipp Reisner "Sync from %s node\n", 2660b411b363SPhilipp Reisner (hg < 0) ? "peer" : "this"); 2661b411b363SPhilipp Reisner } 2662b411b363SPhilipp Reisner 2663b411b363SPhilipp Reisner if (hg == -100) { 2664580b9767SLars Ellenberg /* FIXME this log message is not correct if we end up here 2665580b9767SLars Ellenberg * after an attempted attach on a diskless node. 2666580b9767SLars Ellenberg * We just refuse to attach -- well, we drop the "connection" 2667580b9767SLars Ellenberg * to that disk, in a way... */ 26683a11a487SAdam Gandelman dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n"); 2669b411b363SPhilipp Reisner drbd_khelper(mdev, "split-brain"); 2670b411b363SPhilipp Reisner return C_MASK; 2671b411b363SPhilipp Reisner } 2672b411b363SPhilipp Reisner 2673b411b363SPhilipp Reisner if (hg > 0 && mydisk <= D_INCONSISTENT) { 2674b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n"); 2675b411b363SPhilipp Reisner return C_MASK; 2676b411b363SPhilipp Reisner } 2677b411b363SPhilipp Reisner 2678b411b363SPhilipp Reisner if (hg < 0 && /* by intention we do not use mydisk here. */ 2679b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) { 268089e58e75SPhilipp Reisner switch (mdev->tconn->net_conf->rr_conflict) { 2681b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2682b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost"); 2683b411b363SPhilipp Reisner /* fall through */ 2684b411b363SPhilipp Reisner case ASB_DISCONNECT: 2685b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncTarget, but I am primary!\n"); 2686b411b363SPhilipp Reisner return C_MASK; 2687b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2688b411b363SPhilipp Reisner dev_warn(DEV, "Becoming SyncTarget, violating the stable-data" 2689b411b363SPhilipp Reisner "assumption\n"); 2690b411b363SPhilipp Reisner } 2691b411b363SPhilipp Reisner } 2692b411b363SPhilipp Reisner 269389e58e75SPhilipp Reisner if (mdev->tconn->net_conf->dry_run || test_bit(CONN_DRY_RUN, &mdev->flags)) { 2694cf14c2e9SPhilipp Reisner if (hg == 0) 2695cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n"); 2696cf14c2e9SPhilipp Reisner else 2697cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.", 2698cf14c2e9SPhilipp Reisner drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), 2699cf14c2e9SPhilipp Reisner abs(hg) >= 2 ? "full" : "bit-map based"); 2700cf14c2e9SPhilipp Reisner return C_MASK; 2701cf14c2e9SPhilipp Reisner } 2702cf14c2e9SPhilipp Reisner 2703b411b363SPhilipp Reisner if (abs(hg) >= 2) { 2704b411b363SPhilipp Reisner dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); 270520ceb2b2SLars Ellenberg if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake", 270620ceb2b2SLars Ellenberg BM_LOCKED_SET_ALLOWED)) 2707b411b363SPhilipp Reisner return C_MASK; 2708b411b363SPhilipp Reisner } 2709b411b363SPhilipp Reisner 2710b411b363SPhilipp Reisner if (hg > 0) { /* become sync source. */ 2711b411b363SPhilipp Reisner rv = C_WF_BITMAP_S; 2712b411b363SPhilipp Reisner } else if (hg < 0) { /* become sync target */ 2713b411b363SPhilipp Reisner rv = C_WF_BITMAP_T; 2714b411b363SPhilipp Reisner } else { 2715b411b363SPhilipp Reisner rv = C_CONNECTED; 2716b411b363SPhilipp Reisner if (drbd_bm_total_weight(mdev)) { 2717b411b363SPhilipp Reisner dev_info(DEV, "No resync, but %lu bits in bitmap!\n", 2718b411b363SPhilipp Reisner drbd_bm_total_weight(mdev)); 2719b411b363SPhilipp Reisner } 2720b411b363SPhilipp Reisner } 2721b411b363SPhilipp Reisner 2722b411b363SPhilipp Reisner return rv; 2723b411b363SPhilipp Reisner } 2724b411b363SPhilipp Reisner 2725b411b363SPhilipp Reisner /* returns 1 if invalid */ 2726b411b363SPhilipp Reisner static int cmp_after_sb(enum drbd_after_sb_p peer, enum drbd_after_sb_p self) 2727b411b363SPhilipp Reisner { 2728b411b363SPhilipp Reisner /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ 2729b411b363SPhilipp Reisner if ((peer == ASB_DISCARD_REMOTE && self == ASB_DISCARD_LOCAL) || 2730b411b363SPhilipp Reisner (self == ASB_DISCARD_REMOTE && peer == ASB_DISCARD_LOCAL)) 2731b411b363SPhilipp Reisner return 0; 2732b411b363SPhilipp Reisner 2733b411b363SPhilipp Reisner /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ 2734b411b363SPhilipp Reisner if (peer == ASB_DISCARD_REMOTE || peer == ASB_DISCARD_LOCAL || 2735b411b363SPhilipp Reisner self == ASB_DISCARD_REMOTE || self == ASB_DISCARD_LOCAL) 2736b411b363SPhilipp Reisner return 1; 2737b411b363SPhilipp Reisner 2738b411b363SPhilipp Reisner /* everything else is valid if they are equal on both sides. */ 2739b411b363SPhilipp Reisner if (peer == self) 2740b411b363SPhilipp Reisner return 0; 2741b411b363SPhilipp Reisner 2742b411b363SPhilipp Reisner /* everything es is invalid. */ 2743b411b363SPhilipp Reisner return 1; 2744b411b363SPhilipp Reisner } 2745b411b363SPhilipp Reisner 2746d8763023SAndreas Gruenbacher static int receive_protocol(struct drbd_conf *mdev, enum drbd_packet cmd, 2747d8763023SAndreas Gruenbacher unsigned int data_size) 2748b411b363SPhilipp Reisner { 2749e42325a5SPhilipp Reisner struct p_protocol *p = &mdev->tconn->data.rbuf.protocol; 2750b411b363SPhilipp Reisner int p_proto, p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; 2751cf14c2e9SPhilipp Reisner int p_want_lose, p_two_primaries, cf; 2752b411b363SPhilipp Reisner char p_integrity_alg[SHARED_SECRET_MAX] = ""; 2753b411b363SPhilipp Reisner 2754b411b363SPhilipp Reisner p_proto = be32_to_cpu(p->protocol); 2755b411b363SPhilipp Reisner p_after_sb_0p = be32_to_cpu(p->after_sb_0p); 2756b411b363SPhilipp Reisner p_after_sb_1p = be32_to_cpu(p->after_sb_1p); 2757b411b363SPhilipp Reisner p_after_sb_2p = be32_to_cpu(p->after_sb_2p); 2758b411b363SPhilipp Reisner p_two_primaries = be32_to_cpu(p->two_primaries); 2759cf14c2e9SPhilipp Reisner cf = be32_to_cpu(p->conn_flags); 2760cf14c2e9SPhilipp Reisner p_want_lose = cf & CF_WANT_LOSE; 2761cf14c2e9SPhilipp Reisner 2762cf14c2e9SPhilipp Reisner clear_bit(CONN_DRY_RUN, &mdev->flags); 2763cf14c2e9SPhilipp Reisner 2764cf14c2e9SPhilipp Reisner if (cf & CF_DRY_RUN) 2765cf14c2e9SPhilipp Reisner set_bit(CONN_DRY_RUN, &mdev->flags); 2766b411b363SPhilipp Reisner 276789e58e75SPhilipp Reisner if (p_proto != mdev->tconn->net_conf->wire_protocol) { 2768b411b363SPhilipp Reisner dev_err(DEV, "incompatible communication protocols\n"); 2769b411b363SPhilipp Reisner goto disconnect; 2770b411b363SPhilipp Reisner } 2771b411b363SPhilipp Reisner 277289e58e75SPhilipp Reisner if (cmp_after_sb(p_after_sb_0p, mdev->tconn->net_conf->after_sb_0p)) { 2773b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-0pri settings\n"); 2774b411b363SPhilipp Reisner goto disconnect; 2775b411b363SPhilipp Reisner } 2776b411b363SPhilipp Reisner 277789e58e75SPhilipp Reisner if (cmp_after_sb(p_after_sb_1p, mdev->tconn->net_conf->after_sb_1p)) { 2778b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-1pri settings\n"); 2779b411b363SPhilipp Reisner goto disconnect; 2780b411b363SPhilipp Reisner } 2781b411b363SPhilipp Reisner 278289e58e75SPhilipp Reisner if (cmp_after_sb(p_after_sb_2p, mdev->tconn->net_conf->after_sb_2p)) { 2783b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-2pri settings\n"); 2784b411b363SPhilipp Reisner goto disconnect; 2785b411b363SPhilipp Reisner } 2786b411b363SPhilipp Reisner 278789e58e75SPhilipp Reisner if (p_want_lose && mdev->tconn->net_conf->want_lose) { 2788b411b363SPhilipp Reisner dev_err(DEV, "both sides have the 'want_lose' flag set\n"); 2789b411b363SPhilipp Reisner goto disconnect; 2790b411b363SPhilipp Reisner } 2791b411b363SPhilipp Reisner 279289e58e75SPhilipp Reisner if (p_two_primaries != mdev->tconn->net_conf->two_primaries) { 2793b411b363SPhilipp Reisner dev_err(DEV, "incompatible setting of the two-primaries options\n"); 2794b411b363SPhilipp Reisner goto disconnect; 2795b411b363SPhilipp Reisner } 2796b411b363SPhilipp Reisner 279731890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version >= 87) { 279889e58e75SPhilipp Reisner unsigned char *my_alg = mdev->tconn->net_conf->integrity_alg; 2799b411b363SPhilipp Reisner 2800de0ff338SPhilipp Reisner if (drbd_recv(mdev->tconn, p_integrity_alg, data_size) != data_size) 280181e84650SAndreas Gruenbacher return false; 2802b411b363SPhilipp Reisner 2803b411b363SPhilipp Reisner p_integrity_alg[SHARED_SECRET_MAX-1] = 0; 2804b411b363SPhilipp Reisner if (strcmp(p_integrity_alg, my_alg)) { 2805b411b363SPhilipp Reisner dev_err(DEV, "incompatible setting of the data-integrity-alg\n"); 2806b411b363SPhilipp Reisner goto disconnect; 2807b411b363SPhilipp Reisner } 2808b411b363SPhilipp Reisner dev_info(DEV, "data-integrity-alg: %s\n", 2809b411b363SPhilipp Reisner my_alg[0] ? my_alg : (unsigned char *)"<not-used>"); 2810b411b363SPhilipp Reisner } 2811b411b363SPhilipp Reisner 281281e84650SAndreas Gruenbacher return true; 2813b411b363SPhilipp Reisner 2814b411b363SPhilipp Reisner disconnect: 2815b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 281681e84650SAndreas Gruenbacher return false; 2817b411b363SPhilipp Reisner } 2818b411b363SPhilipp Reisner 2819b411b363SPhilipp Reisner /* helper function 2820b411b363SPhilipp Reisner * input: alg name, feature name 2821b411b363SPhilipp Reisner * return: NULL (alg name was "") 2822b411b363SPhilipp Reisner * ERR_PTR(error) if something goes wrong 2823b411b363SPhilipp Reisner * or the crypto hash ptr, if it worked out ok. */ 2824b411b363SPhilipp Reisner struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev, 2825b411b363SPhilipp Reisner const char *alg, const char *name) 2826b411b363SPhilipp Reisner { 2827b411b363SPhilipp Reisner struct crypto_hash *tfm; 2828b411b363SPhilipp Reisner 2829b411b363SPhilipp Reisner if (!alg[0]) 2830b411b363SPhilipp Reisner return NULL; 2831b411b363SPhilipp Reisner 2832b411b363SPhilipp Reisner tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC); 2833b411b363SPhilipp Reisner if (IS_ERR(tfm)) { 2834b411b363SPhilipp Reisner dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n", 2835b411b363SPhilipp Reisner alg, name, PTR_ERR(tfm)); 2836b411b363SPhilipp Reisner return tfm; 2837b411b363SPhilipp Reisner } 2838b411b363SPhilipp Reisner if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) { 2839b411b363SPhilipp Reisner crypto_free_hash(tfm); 2840b411b363SPhilipp Reisner dev_err(DEV, "\"%s\" is not a digest (%s)\n", alg, name); 2841b411b363SPhilipp Reisner return ERR_PTR(-EINVAL); 2842b411b363SPhilipp Reisner } 2843b411b363SPhilipp Reisner return tfm; 2844b411b363SPhilipp Reisner } 2845b411b363SPhilipp Reisner 2846d8763023SAndreas Gruenbacher static int receive_SyncParam(struct drbd_conf *mdev, enum drbd_packet cmd, 2847d8763023SAndreas Gruenbacher unsigned int packet_size) 2848b411b363SPhilipp Reisner { 284981e84650SAndreas Gruenbacher int ok = true; 2850e42325a5SPhilipp Reisner struct p_rs_param_95 *p = &mdev->tconn->data.rbuf.rs_param_95; 2851b411b363SPhilipp Reisner unsigned int header_size, data_size, exp_max_sz; 2852b411b363SPhilipp Reisner struct crypto_hash *verify_tfm = NULL; 2853b411b363SPhilipp Reisner struct crypto_hash *csums_tfm = NULL; 285431890f4aSPhilipp Reisner const int apv = mdev->tconn->agreed_pro_version; 2855778f271dSPhilipp Reisner int *rs_plan_s = NULL; 2856778f271dSPhilipp Reisner int fifo_size = 0; 2857b411b363SPhilipp Reisner 2858b411b363SPhilipp Reisner exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) 2859b411b363SPhilipp Reisner : apv == 88 ? sizeof(struct p_rs_param) 2860b411b363SPhilipp Reisner + SHARED_SECRET_MAX 28618e26f9ccSPhilipp Reisner : apv <= 94 ? sizeof(struct p_rs_param_89) 28628e26f9ccSPhilipp Reisner : /* apv >= 95 */ sizeof(struct p_rs_param_95); 2863b411b363SPhilipp Reisner 286402918be2SPhilipp Reisner if (packet_size > exp_max_sz) { 2865b411b363SPhilipp Reisner dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n", 286602918be2SPhilipp Reisner packet_size, exp_max_sz); 286781e84650SAndreas Gruenbacher return false; 2868b411b363SPhilipp Reisner } 2869b411b363SPhilipp Reisner 2870b411b363SPhilipp Reisner if (apv <= 88) { 2871257d0af6SPhilipp Reisner header_size = sizeof(struct p_rs_param) - sizeof(struct p_header); 287202918be2SPhilipp Reisner data_size = packet_size - header_size; 28738e26f9ccSPhilipp Reisner } else if (apv <= 94) { 2874257d0af6SPhilipp Reisner header_size = sizeof(struct p_rs_param_89) - sizeof(struct p_header); 287502918be2SPhilipp Reisner data_size = packet_size - header_size; 2876b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 28778e26f9ccSPhilipp Reisner } else { 2878257d0af6SPhilipp Reisner header_size = sizeof(struct p_rs_param_95) - sizeof(struct p_header); 287902918be2SPhilipp Reisner data_size = packet_size - header_size; 2880b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 2881b411b363SPhilipp Reisner } 2882b411b363SPhilipp Reisner 2883b411b363SPhilipp Reisner /* initialize verify_alg and csums_alg */ 2884b411b363SPhilipp Reisner memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); 2885b411b363SPhilipp Reisner 2886de0ff338SPhilipp Reisner if (drbd_recv(mdev->tconn, &p->head.payload, header_size) != header_size) 288781e84650SAndreas Gruenbacher return false; 2888b411b363SPhilipp Reisner 2889b411b363SPhilipp Reisner mdev->sync_conf.rate = be32_to_cpu(p->rate); 2890b411b363SPhilipp Reisner 2891b411b363SPhilipp Reisner if (apv >= 88) { 2892b411b363SPhilipp Reisner if (apv == 88) { 2893b411b363SPhilipp Reisner if (data_size > SHARED_SECRET_MAX) { 2894b411b363SPhilipp Reisner dev_err(DEV, "verify-alg too long, " 2895b411b363SPhilipp Reisner "peer wants %u, accepting only %u byte\n", 2896b411b363SPhilipp Reisner data_size, SHARED_SECRET_MAX); 289781e84650SAndreas Gruenbacher return false; 2898b411b363SPhilipp Reisner } 2899b411b363SPhilipp Reisner 2900de0ff338SPhilipp Reisner if (drbd_recv(mdev->tconn, p->verify_alg, data_size) != data_size) 290181e84650SAndreas Gruenbacher return false; 2902b411b363SPhilipp Reisner 2903b411b363SPhilipp Reisner /* we expect NUL terminated string */ 2904b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 2905b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[data_size-1] == 0); 2906b411b363SPhilipp Reisner p->verify_alg[data_size-1] = 0; 2907b411b363SPhilipp Reisner 2908b411b363SPhilipp Reisner } else /* apv >= 89 */ { 2909b411b363SPhilipp Reisner /* we still expect NUL terminated strings */ 2910b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 2911b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0); 2912b411b363SPhilipp Reisner D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0); 2913b411b363SPhilipp Reisner p->verify_alg[SHARED_SECRET_MAX-1] = 0; 2914b411b363SPhilipp Reisner p->csums_alg[SHARED_SECRET_MAX-1] = 0; 2915b411b363SPhilipp Reisner } 2916b411b363SPhilipp Reisner 2917b411b363SPhilipp Reisner if (strcmp(mdev->sync_conf.verify_alg, p->verify_alg)) { 2918b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 2919b411b363SPhilipp Reisner dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", 2920b411b363SPhilipp Reisner mdev->sync_conf.verify_alg, p->verify_alg); 2921b411b363SPhilipp Reisner goto disconnect; 2922b411b363SPhilipp Reisner } 2923b411b363SPhilipp Reisner verify_tfm = drbd_crypto_alloc_digest_safe(mdev, 2924b411b363SPhilipp Reisner p->verify_alg, "verify-alg"); 2925b411b363SPhilipp Reisner if (IS_ERR(verify_tfm)) { 2926b411b363SPhilipp Reisner verify_tfm = NULL; 2927b411b363SPhilipp Reisner goto disconnect; 2928b411b363SPhilipp Reisner } 2929b411b363SPhilipp Reisner } 2930b411b363SPhilipp Reisner 2931b411b363SPhilipp Reisner if (apv >= 89 && strcmp(mdev->sync_conf.csums_alg, p->csums_alg)) { 2932b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 2933b411b363SPhilipp Reisner dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", 2934b411b363SPhilipp Reisner mdev->sync_conf.csums_alg, p->csums_alg); 2935b411b363SPhilipp Reisner goto disconnect; 2936b411b363SPhilipp Reisner } 2937b411b363SPhilipp Reisner csums_tfm = drbd_crypto_alloc_digest_safe(mdev, 2938b411b363SPhilipp Reisner p->csums_alg, "csums-alg"); 2939b411b363SPhilipp Reisner if (IS_ERR(csums_tfm)) { 2940b411b363SPhilipp Reisner csums_tfm = NULL; 2941b411b363SPhilipp Reisner goto disconnect; 2942b411b363SPhilipp Reisner } 2943b411b363SPhilipp Reisner } 2944b411b363SPhilipp Reisner 29458e26f9ccSPhilipp Reisner if (apv > 94) { 29468e26f9ccSPhilipp Reisner mdev->sync_conf.rate = be32_to_cpu(p->rate); 29478e26f9ccSPhilipp Reisner mdev->sync_conf.c_plan_ahead = be32_to_cpu(p->c_plan_ahead); 29488e26f9ccSPhilipp Reisner mdev->sync_conf.c_delay_target = be32_to_cpu(p->c_delay_target); 29498e26f9ccSPhilipp Reisner mdev->sync_conf.c_fill_target = be32_to_cpu(p->c_fill_target); 29508e26f9ccSPhilipp Reisner mdev->sync_conf.c_max_rate = be32_to_cpu(p->c_max_rate); 2951778f271dSPhilipp Reisner 2952778f271dSPhilipp Reisner fifo_size = (mdev->sync_conf.c_plan_ahead * 10 * SLEEP_TIME) / HZ; 2953778f271dSPhilipp Reisner if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) { 2954778f271dSPhilipp Reisner rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL); 2955778f271dSPhilipp Reisner if (!rs_plan_s) { 2956778f271dSPhilipp Reisner dev_err(DEV, "kmalloc of fifo_buffer failed"); 2957778f271dSPhilipp Reisner goto disconnect; 2958778f271dSPhilipp Reisner } 2959778f271dSPhilipp Reisner } 29608e26f9ccSPhilipp Reisner } 2961b411b363SPhilipp Reisner 2962b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 2963b411b363SPhilipp Reisner /* lock against drbd_nl_syncer_conf() */ 2964b411b363SPhilipp Reisner if (verify_tfm) { 2965b411b363SPhilipp Reisner strcpy(mdev->sync_conf.verify_alg, p->verify_alg); 2966b411b363SPhilipp Reisner mdev->sync_conf.verify_alg_len = strlen(p->verify_alg) + 1; 2967b411b363SPhilipp Reisner crypto_free_hash(mdev->verify_tfm); 2968b411b363SPhilipp Reisner mdev->verify_tfm = verify_tfm; 2969b411b363SPhilipp Reisner dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg); 2970b411b363SPhilipp Reisner } 2971b411b363SPhilipp Reisner if (csums_tfm) { 2972b411b363SPhilipp Reisner strcpy(mdev->sync_conf.csums_alg, p->csums_alg); 2973b411b363SPhilipp Reisner mdev->sync_conf.csums_alg_len = strlen(p->csums_alg) + 1; 2974b411b363SPhilipp Reisner crypto_free_hash(mdev->csums_tfm); 2975b411b363SPhilipp Reisner mdev->csums_tfm = csums_tfm; 2976b411b363SPhilipp Reisner dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg); 2977b411b363SPhilipp Reisner } 2978778f271dSPhilipp Reisner if (fifo_size != mdev->rs_plan_s.size) { 2979778f271dSPhilipp Reisner kfree(mdev->rs_plan_s.values); 2980778f271dSPhilipp Reisner mdev->rs_plan_s.values = rs_plan_s; 2981778f271dSPhilipp Reisner mdev->rs_plan_s.size = fifo_size; 2982778f271dSPhilipp Reisner mdev->rs_planed = 0; 2983778f271dSPhilipp Reisner } 2984b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 2985b411b363SPhilipp Reisner } 2986b411b363SPhilipp Reisner 2987b411b363SPhilipp Reisner return ok; 2988b411b363SPhilipp Reisner disconnect: 2989b411b363SPhilipp Reisner /* just for completeness: actually not needed, 2990b411b363SPhilipp Reisner * as this is not reached if csums_tfm was ok. */ 2991b411b363SPhilipp Reisner crypto_free_hash(csums_tfm); 2992b411b363SPhilipp Reisner /* but free the verify_tfm again, if csums_tfm did not work out */ 2993b411b363SPhilipp Reisner crypto_free_hash(verify_tfm); 2994b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 299581e84650SAndreas Gruenbacher return false; 2996b411b363SPhilipp Reisner } 2997b411b363SPhilipp Reisner 2998b411b363SPhilipp Reisner /* warn if the arguments differ by more than 12.5% */ 2999b411b363SPhilipp Reisner static void warn_if_differ_considerably(struct drbd_conf *mdev, 3000b411b363SPhilipp Reisner const char *s, sector_t a, sector_t b) 3001b411b363SPhilipp Reisner { 3002b411b363SPhilipp Reisner sector_t d; 3003b411b363SPhilipp Reisner if (a == 0 || b == 0) 3004b411b363SPhilipp Reisner return; 3005b411b363SPhilipp Reisner d = (a > b) ? (a - b) : (b - a); 3006b411b363SPhilipp Reisner if (d > (a>>3) || d > (b>>3)) 3007b411b363SPhilipp Reisner dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s, 3008b411b363SPhilipp Reisner (unsigned long long)a, (unsigned long long)b); 3009b411b363SPhilipp Reisner } 3010b411b363SPhilipp Reisner 3011d8763023SAndreas Gruenbacher static int receive_sizes(struct drbd_conf *mdev, enum drbd_packet cmd, 3012d8763023SAndreas Gruenbacher unsigned int data_size) 3013b411b363SPhilipp Reisner { 3014e42325a5SPhilipp Reisner struct p_sizes *p = &mdev->tconn->data.rbuf.sizes; 3015b411b363SPhilipp Reisner enum determine_dev_size dd = unchanged; 3016b411b363SPhilipp Reisner sector_t p_size, p_usize, my_usize; 3017b411b363SPhilipp Reisner int ldsc = 0; /* local disk size changed */ 3018e89b591cSPhilipp Reisner enum dds_flags ddsf; 3019b411b363SPhilipp Reisner 3020b411b363SPhilipp Reisner p_size = be64_to_cpu(p->d_size); 3021b411b363SPhilipp Reisner p_usize = be64_to_cpu(p->u_size); 3022b411b363SPhilipp Reisner 3023b411b363SPhilipp Reisner if (p_size == 0 && mdev->state.disk == D_DISKLESS) { 3024b411b363SPhilipp Reisner dev_err(DEV, "some backing storage is needed\n"); 3025b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 302681e84650SAndreas Gruenbacher return false; 3027b411b363SPhilipp Reisner } 3028b411b363SPhilipp Reisner 3029b411b363SPhilipp Reisner /* just store the peer's disk size for now. 3030b411b363SPhilipp Reisner * we still need to figure out whether we accept that. */ 3031b411b363SPhilipp Reisner mdev->p_size = p_size; 3032b411b363SPhilipp Reisner 3033b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3034b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "lower level device sizes", 3035b411b363SPhilipp Reisner p_size, drbd_get_max_capacity(mdev->ldev)); 3036b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "user requested size", 3037b411b363SPhilipp Reisner p_usize, mdev->ldev->dc.disk_size); 3038b411b363SPhilipp Reisner 3039b411b363SPhilipp Reisner /* if this is the first connect, or an otherwise expected 3040b411b363SPhilipp Reisner * param exchange, choose the minimum */ 3041b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) 3042b411b363SPhilipp Reisner p_usize = min_not_zero((sector_t)mdev->ldev->dc.disk_size, 3043b411b363SPhilipp Reisner p_usize); 3044b411b363SPhilipp Reisner 3045b411b363SPhilipp Reisner my_usize = mdev->ldev->dc.disk_size; 3046b411b363SPhilipp Reisner 3047b411b363SPhilipp Reisner if (mdev->ldev->dc.disk_size != p_usize) { 3048b411b363SPhilipp Reisner mdev->ldev->dc.disk_size = p_usize; 3049b411b363SPhilipp Reisner dev_info(DEV, "Peer sets u_size to %lu sectors\n", 3050b411b363SPhilipp Reisner (unsigned long)mdev->ldev->dc.disk_size); 3051b411b363SPhilipp Reisner } 3052b411b363SPhilipp Reisner 3053b411b363SPhilipp Reisner /* Never shrink a device with usable data during connect. 3054b411b363SPhilipp Reisner But allow online shrinking if we are connected. */ 3055a393db6fSPhilipp Reisner if (drbd_new_dev_size(mdev, mdev->ldev, 0) < 3056b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) && 3057b411b363SPhilipp Reisner mdev->state.disk >= D_OUTDATED && 3058b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED) { 3059b411b363SPhilipp Reisner dev_err(DEV, "The peer's disk size is too small!\n"); 3060b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 3061b411b363SPhilipp Reisner mdev->ldev->dc.disk_size = my_usize; 3062b411b363SPhilipp Reisner put_ldev(mdev); 306381e84650SAndreas Gruenbacher return false; 3064b411b363SPhilipp Reisner } 3065b411b363SPhilipp Reisner put_ldev(mdev); 3066b411b363SPhilipp Reisner } 3067b411b363SPhilipp Reisner 3068e89b591cSPhilipp Reisner ddsf = be16_to_cpu(p->dds_flags); 3069b411b363SPhilipp Reisner if (get_ldev(mdev)) { 307024c4830cSBart Van Assche dd = drbd_determine_dev_size(mdev, ddsf); 3071b411b363SPhilipp Reisner put_ldev(mdev); 3072b411b363SPhilipp Reisner if (dd == dev_size_error) 307381e84650SAndreas Gruenbacher return false; 3074b411b363SPhilipp Reisner drbd_md_sync(mdev); 3075b411b363SPhilipp Reisner } else { 3076b411b363SPhilipp Reisner /* I am diskless, need to accept the peer's size. */ 3077b411b363SPhilipp Reisner drbd_set_my_capacity(mdev, p_size); 3078b411b363SPhilipp Reisner } 3079b411b363SPhilipp Reisner 308099432fccSPhilipp Reisner mdev->peer_max_bio_size = be32_to_cpu(p->max_bio_size); 308199432fccSPhilipp Reisner drbd_reconsider_max_bio_size(mdev); 308299432fccSPhilipp Reisner 3083b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3084b411b363SPhilipp Reisner if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { 3085b411b363SPhilipp Reisner mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); 3086b411b363SPhilipp Reisner ldsc = 1; 3087b411b363SPhilipp Reisner } 3088b411b363SPhilipp Reisner 3089b411b363SPhilipp Reisner put_ldev(mdev); 3090b411b363SPhilipp Reisner } 3091b411b363SPhilipp Reisner 3092b411b363SPhilipp Reisner if (mdev->state.conn > C_WF_REPORT_PARAMS) { 3093b411b363SPhilipp Reisner if (be64_to_cpu(p->c_size) != 3094b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) || ldsc) { 3095b411b363SPhilipp Reisner /* we have different sizes, probably peer 3096b411b363SPhilipp Reisner * needs to know my new size... */ 3097e89b591cSPhilipp Reisner drbd_send_sizes(mdev, 0, ddsf); 3098b411b363SPhilipp Reisner } 3099b411b363SPhilipp Reisner if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) || 3100b411b363SPhilipp Reisner (dd == grew && mdev->state.conn == C_CONNECTED)) { 3101b411b363SPhilipp Reisner if (mdev->state.pdsk >= D_INCONSISTENT && 3102e89b591cSPhilipp Reisner mdev->state.disk >= D_INCONSISTENT) { 3103e89b591cSPhilipp Reisner if (ddsf & DDSF_NO_RESYNC) 3104e89b591cSPhilipp Reisner dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n"); 3105b411b363SPhilipp Reisner else 3106e89b591cSPhilipp Reisner resync_after_online_grow(mdev); 3107e89b591cSPhilipp Reisner } else 3108b411b363SPhilipp Reisner set_bit(RESYNC_AFTER_NEG, &mdev->flags); 3109b411b363SPhilipp Reisner } 3110b411b363SPhilipp Reisner } 3111b411b363SPhilipp Reisner 311281e84650SAndreas Gruenbacher return true; 3113b411b363SPhilipp Reisner } 3114b411b363SPhilipp Reisner 3115d8763023SAndreas Gruenbacher static int receive_uuids(struct drbd_conf *mdev, enum drbd_packet cmd, 3116d8763023SAndreas Gruenbacher unsigned int data_size) 3117b411b363SPhilipp Reisner { 3118e42325a5SPhilipp Reisner struct p_uuids *p = &mdev->tconn->data.rbuf.uuids; 3119b411b363SPhilipp Reisner u64 *p_uuid; 312062b0da3aSLars Ellenberg int i, updated_uuids = 0; 3121b411b363SPhilipp Reisner 3122b411b363SPhilipp Reisner p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); 3123b411b363SPhilipp Reisner 3124b411b363SPhilipp Reisner for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) 3125b411b363SPhilipp Reisner p_uuid[i] = be64_to_cpu(p->uuid[i]); 3126b411b363SPhilipp Reisner 3127b411b363SPhilipp Reisner kfree(mdev->p_uuid); 3128b411b363SPhilipp Reisner mdev->p_uuid = p_uuid; 3129b411b363SPhilipp Reisner 3130b411b363SPhilipp Reisner if (mdev->state.conn < C_CONNECTED && 3131b411b363SPhilipp Reisner mdev->state.disk < D_INCONSISTENT && 3132b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && 3133b411b363SPhilipp Reisner (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { 3134b411b363SPhilipp Reisner dev_err(DEV, "Can only connect to data with current UUID=%016llX\n", 3135b411b363SPhilipp Reisner (unsigned long long)mdev->ed_uuid); 3136b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 313781e84650SAndreas Gruenbacher return false; 3138b411b363SPhilipp Reisner } 3139b411b363SPhilipp Reisner 3140b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3141b411b363SPhilipp Reisner int skip_initial_sync = 3142b411b363SPhilipp Reisner mdev->state.conn == C_CONNECTED && 314331890f4aSPhilipp Reisner mdev->tconn->agreed_pro_version >= 90 && 3144b411b363SPhilipp Reisner mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && 3145b411b363SPhilipp Reisner (p_uuid[UI_FLAGS] & 8); 3146b411b363SPhilipp Reisner if (skip_initial_sync) { 3147b411b363SPhilipp Reisner dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n"); 3148b411b363SPhilipp Reisner drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, 314920ceb2b2SLars Ellenberg "clear_n_write from receive_uuids", 315020ceb2b2SLars Ellenberg BM_LOCKED_TEST_ALLOWED); 3151b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]); 3152b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0); 3153b411b363SPhilipp Reisner _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), 3154b411b363SPhilipp Reisner CS_VERBOSE, NULL); 3155b411b363SPhilipp Reisner drbd_md_sync(mdev); 315662b0da3aSLars Ellenberg updated_uuids = 1; 3157b411b363SPhilipp Reisner } 3158b411b363SPhilipp Reisner put_ldev(mdev); 315918a50fa2SPhilipp Reisner } else if (mdev->state.disk < D_INCONSISTENT && 316018a50fa2SPhilipp Reisner mdev->state.role == R_PRIMARY) { 316118a50fa2SPhilipp Reisner /* I am a diskless primary, the peer just created a new current UUID 316218a50fa2SPhilipp Reisner for me. */ 316362b0da3aSLars Ellenberg updated_uuids = drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 3164b411b363SPhilipp Reisner } 3165b411b363SPhilipp Reisner 3166b411b363SPhilipp Reisner /* Before we test for the disk state, we should wait until an eventually 3167b411b363SPhilipp Reisner ongoing cluster wide state change is finished. That is important if 3168b411b363SPhilipp Reisner we are primary and are detaching from our disk. We need to see the 3169b411b363SPhilipp Reisner new disk state... */ 3170b411b363SPhilipp Reisner wait_event(mdev->misc_wait, !test_bit(CLUSTER_ST_CHANGE, &mdev->flags)); 3171b411b363SPhilipp Reisner if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT) 317262b0da3aSLars Ellenberg updated_uuids |= drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 317362b0da3aSLars Ellenberg 317462b0da3aSLars Ellenberg if (updated_uuids) 317562b0da3aSLars Ellenberg drbd_print_uuids(mdev, "receiver updated UUIDs to"); 3176b411b363SPhilipp Reisner 317781e84650SAndreas Gruenbacher return true; 3178b411b363SPhilipp Reisner } 3179b411b363SPhilipp Reisner 3180b411b363SPhilipp Reisner /** 3181b411b363SPhilipp Reisner * convert_state() - Converts the peer's view of the cluster state to our point of view 3182b411b363SPhilipp Reisner * @ps: The state as seen by the peer. 3183b411b363SPhilipp Reisner */ 3184b411b363SPhilipp Reisner static union drbd_state convert_state(union drbd_state ps) 3185b411b363SPhilipp Reisner { 3186b411b363SPhilipp Reisner union drbd_state ms; 3187b411b363SPhilipp Reisner 3188b411b363SPhilipp Reisner static enum drbd_conns c_tab[] = { 3189b411b363SPhilipp Reisner [C_CONNECTED] = C_CONNECTED, 3190b411b363SPhilipp Reisner 3191b411b363SPhilipp Reisner [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, 3192b411b363SPhilipp Reisner [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, 3193b411b363SPhilipp Reisner [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ 3194b411b363SPhilipp Reisner [C_VERIFY_S] = C_VERIFY_T, 3195b411b363SPhilipp Reisner [C_MASK] = C_MASK, 3196b411b363SPhilipp Reisner }; 3197b411b363SPhilipp Reisner 3198b411b363SPhilipp Reisner ms.i = ps.i; 3199b411b363SPhilipp Reisner 3200b411b363SPhilipp Reisner ms.conn = c_tab[ps.conn]; 3201b411b363SPhilipp Reisner ms.peer = ps.role; 3202b411b363SPhilipp Reisner ms.role = ps.peer; 3203b411b363SPhilipp Reisner ms.pdsk = ps.disk; 3204b411b363SPhilipp Reisner ms.disk = ps.pdsk; 3205b411b363SPhilipp Reisner ms.peer_isp = (ps.aftr_isp | ps.user_isp); 3206b411b363SPhilipp Reisner 3207b411b363SPhilipp Reisner return ms; 3208b411b363SPhilipp Reisner } 3209b411b363SPhilipp Reisner 3210d8763023SAndreas Gruenbacher static int receive_req_state(struct drbd_conf *mdev, enum drbd_packet cmd, 3211d8763023SAndreas Gruenbacher unsigned int data_size) 3212b411b363SPhilipp Reisner { 3213e42325a5SPhilipp Reisner struct p_req_state *p = &mdev->tconn->data.rbuf.req_state; 3214b411b363SPhilipp Reisner union drbd_state mask, val; 3215bf885f8aSAndreas Gruenbacher enum drbd_state_rv rv; 3216b411b363SPhilipp Reisner 3217b411b363SPhilipp Reisner mask.i = be32_to_cpu(p->mask); 3218b411b363SPhilipp Reisner val.i = be32_to_cpu(p->val); 3219b411b363SPhilipp Reisner 322025703f83SPhilipp Reisner if (test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) && 3221b411b363SPhilipp Reisner test_bit(CLUSTER_ST_CHANGE, &mdev->flags)) { 3222b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG); 322381e84650SAndreas Gruenbacher return true; 3224b411b363SPhilipp Reisner } 3225b411b363SPhilipp Reisner 3226b411b363SPhilipp Reisner mask = convert_state(mask); 3227b411b363SPhilipp Reisner val = convert_state(val); 3228b411b363SPhilipp Reisner 3229b411b363SPhilipp Reisner rv = drbd_change_state(mdev, CS_VERBOSE, mask, val); 3230b411b363SPhilipp Reisner 3231b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, rv); 3232b411b363SPhilipp Reisner drbd_md_sync(mdev); 3233b411b363SPhilipp Reisner 323481e84650SAndreas Gruenbacher return true; 3235b411b363SPhilipp Reisner } 3236b411b363SPhilipp Reisner 3237d8763023SAndreas Gruenbacher static int receive_state(struct drbd_conf *mdev, enum drbd_packet cmd, 3238d8763023SAndreas Gruenbacher unsigned int data_size) 3239b411b363SPhilipp Reisner { 3240e42325a5SPhilipp Reisner struct p_state *p = &mdev->tconn->data.rbuf.state; 32414ac4aadaSLars Ellenberg union drbd_state os, ns, peer_state; 3242b411b363SPhilipp Reisner enum drbd_disk_state real_peer_disk; 324365d922c3SPhilipp Reisner enum chg_state_flags cs_flags; 3244b411b363SPhilipp Reisner int rv; 3245b411b363SPhilipp Reisner 3246b411b363SPhilipp Reisner peer_state.i = be32_to_cpu(p->state); 3247b411b363SPhilipp Reisner 3248b411b363SPhilipp Reisner real_peer_disk = peer_state.disk; 3249b411b363SPhilipp Reisner if (peer_state.disk == D_NEGOTIATING) { 3250b411b363SPhilipp Reisner real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; 3251b411b363SPhilipp Reisner dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); 3252b411b363SPhilipp Reisner } 3253b411b363SPhilipp Reisner 325487eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 3255b411b363SPhilipp Reisner retry: 32564ac4aadaSLars Ellenberg os = ns = mdev->state; 325787eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3258b411b363SPhilipp Reisner 3259e9ef7bb6SLars Ellenberg /* peer says his disk is uptodate, while we think it is inconsistent, 3260e9ef7bb6SLars Ellenberg * and this happens while we think we have a sync going on. */ 3261e9ef7bb6SLars Ellenberg if (os.pdsk == D_INCONSISTENT && real_peer_disk == D_UP_TO_DATE && 3262e9ef7bb6SLars Ellenberg os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { 3263e9ef7bb6SLars Ellenberg /* If we are (becoming) SyncSource, but peer is still in sync 3264e9ef7bb6SLars Ellenberg * preparation, ignore its uptodate-ness to avoid flapping, it 3265e9ef7bb6SLars Ellenberg * will change to inconsistent once the peer reaches active 3266e9ef7bb6SLars Ellenberg * syncing states. 3267e9ef7bb6SLars Ellenberg * It may have changed syncer-paused flags, however, so we 3268e9ef7bb6SLars Ellenberg * cannot ignore this completely. */ 3269e9ef7bb6SLars Ellenberg if (peer_state.conn > C_CONNECTED && 3270e9ef7bb6SLars Ellenberg peer_state.conn < C_SYNC_SOURCE) 3271e9ef7bb6SLars Ellenberg real_peer_disk = D_INCONSISTENT; 3272e9ef7bb6SLars Ellenberg 3273e9ef7bb6SLars Ellenberg /* if peer_state changes to connected at the same time, 3274e9ef7bb6SLars Ellenberg * it explicitly notifies us that it finished resync. 3275e9ef7bb6SLars Ellenberg * Maybe we should finish it up, too? */ 3276e9ef7bb6SLars Ellenberg else if (os.conn >= C_SYNC_SOURCE && 3277e9ef7bb6SLars Ellenberg peer_state.conn == C_CONNECTED) { 3278e9ef7bb6SLars Ellenberg if (drbd_bm_total_weight(mdev) <= mdev->rs_failed) 3279e9ef7bb6SLars Ellenberg drbd_resync_finished(mdev); 328081e84650SAndreas Gruenbacher return true; 3281e9ef7bb6SLars Ellenberg } 3282e9ef7bb6SLars Ellenberg } 3283e9ef7bb6SLars Ellenberg 3284e9ef7bb6SLars Ellenberg /* peer says his disk is inconsistent, while we think it is uptodate, 3285e9ef7bb6SLars Ellenberg * and this happens while the peer still thinks we have a sync going on, 3286e9ef7bb6SLars Ellenberg * but we think we are already done with the sync. 3287e9ef7bb6SLars Ellenberg * We ignore this to avoid flapping pdsk. 3288e9ef7bb6SLars Ellenberg * This should not happen, if the peer is a recent version of drbd. */ 3289e9ef7bb6SLars Ellenberg if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && 3290e9ef7bb6SLars Ellenberg os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) 3291e9ef7bb6SLars Ellenberg real_peer_disk = D_UP_TO_DATE; 3292e9ef7bb6SLars Ellenberg 32934ac4aadaSLars Ellenberg if (ns.conn == C_WF_REPORT_PARAMS) 32944ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3295b411b363SPhilipp Reisner 329667531718SPhilipp Reisner if (peer_state.conn == C_AHEAD) 329767531718SPhilipp Reisner ns.conn = C_BEHIND; 329867531718SPhilipp Reisner 3299b411b363SPhilipp Reisner if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING && 3300b411b363SPhilipp Reisner get_ldev_if_state(mdev, D_NEGOTIATING)) { 3301b411b363SPhilipp Reisner int cr; /* consider resync */ 3302b411b363SPhilipp Reisner 3303b411b363SPhilipp Reisner /* if we established a new connection */ 33044ac4aadaSLars Ellenberg cr = (os.conn < C_CONNECTED); 3305b411b363SPhilipp Reisner /* if we had an established connection 3306b411b363SPhilipp Reisner * and one of the nodes newly attaches a disk */ 33074ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3308b411b363SPhilipp Reisner (peer_state.disk == D_NEGOTIATING || 33094ac4aadaSLars Ellenberg os.disk == D_NEGOTIATING)); 3310b411b363SPhilipp Reisner /* if we have both been inconsistent, and the peer has been 3311b411b363SPhilipp Reisner * forced to be UpToDate with --overwrite-data */ 3312b411b363SPhilipp Reisner cr |= test_bit(CONSIDER_RESYNC, &mdev->flags); 3313b411b363SPhilipp Reisner /* if we had been plain connected, and the admin requested to 3314b411b363SPhilipp Reisner * start a sync by "invalidate" or "invalidate-remote" */ 33154ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3316b411b363SPhilipp Reisner (peer_state.conn >= C_STARTING_SYNC_S && 3317b411b363SPhilipp Reisner peer_state.conn <= C_WF_BITMAP_T)); 3318b411b363SPhilipp Reisner 3319b411b363SPhilipp Reisner if (cr) 33204ac4aadaSLars Ellenberg ns.conn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk); 3321b411b363SPhilipp Reisner 3322b411b363SPhilipp Reisner put_ldev(mdev); 33234ac4aadaSLars Ellenberg if (ns.conn == C_MASK) { 33244ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3325b411b363SPhilipp Reisner if (mdev->state.disk == D_NEGOTIATING) { 332682f59cc6SLars Ellenberg drbd_force_state(mdev, NS(disk, D_FAILED)); 3327b411b363SPhilipp Reisner } else if (peer_state.disk == D_NEGOTIATING) { 3328b411b363SPhilipp Reisner dev_err(DEV, "Disk attach process on the peer node was aborted.\n"); 3329b411b363SPhilipp Reisner peer_state.disk = D_DISKLESS; 3330580b9767SLars Ellenberg real_peer_disk = D_DISKLESS; 3331b411b363SPhilipp Reisner } else { 3332cf14c2e9SPhilipp Reisner if (test_and_clear_bit(CONN_DRY_RUN, &mdev->flags)) 333381e84650SAndreas Gruenbacher return false; 33344ac4aadaSLars Ellenberg D_ASSERT(os.conn == C_WF_REPORT_PARAMS); 3335b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 333681e84650SAndreas Gruenbacher return false; 3337b411b363SPhilipp Reisner } 3338b411b363SPhilipp Reisner } 3339b411b363SPhilipp Reisner } 3340b411b363SPhilipp Reisner 334187eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 33424ac4aadaSLars Ellenberg if (mdev->state.i != os.i) 3343b411b363SPhilipp Reisner goto retry; 3344b411b363SPhilipp Reisner clear_bit(CONSIDER_RESYNC, &mdev->flags); 3345b411b363SPhilipp Reisner ns.peer = peer_state.role; 3346b411b363SPhilipp Reisner ns.pdsk = real_peer_disk; 3347b411b363SPhilipp Reisner ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); 33484ac4aadaSLars Ellenberg if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) 3349b411b363SPhilipp Reisner ns.disk = mdev->new_state_tmp.disk; 33504ac4aadaSLars Ellenberg cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); 33514ac4aadaSLars Ellenberg if (ns.pdsk == D_CONSISTENT && is_susp(ns) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && 3352481c6f50SPhilipp Reisner test_bit(NEW_CUR_UUID, &mdev->flags)) { 33538554df1cSAndreas Gruenbacher /* Do not allow tl_restart(RESEND) for a rebooted peer. We can only allow this 3354481c6f50SPhilipp Reisner for temporal network outages! */ 335587eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3356481c6f50SPhilipp Reisner dev_err(DEV, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); 3357481c6f50SPhilipp Reisner tl_clear(mdev); 3358481c6f50SPhilipp Reisner drbd_uuid_new_current(mdev); 3359481c6f50SPhilipp Reisner clear_bit(NEW_CUR_UUID, &mdev->flags); 3360481c6f50SPhilipp Reisner drbd_force_state(mdev, NS2(conn, C_PROTOCOL_ERROR, susp, 0)); 336181e84650SAndreas Gruenbacher return false; 3362481c6f50SPhilipp Reisner } 336365d922c3SPhilipp Reisner rv = _drbd_set_state(mdev, ns, cs_flags, NULL); 3364b411b363SPhilipp Reisner ns = mdev->state; 336587eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3366b411b363SPhilipp Reisner 3367b411b363SPhilipp Reisner if (rv < SS_SUCCESS) { 3368b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 336981e84650SAndreas Gruenbacher return false; 3370b411b363SPhilipp Reisner } 3371b411b363SPhilipp Reisner 33724ac4aadaSLars Ellenberg if (os.conn > C_WF_REPORT_PARAMS) { 33734ac4aadaSLars Ellenberg if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED && 3374b411b363SPhilipp Reisner peer_state.disk != D_NEGOTIATING ) { 3375b411b363SPhilipp Reisner /* we want resync, peer has not yet decided to sync... */ 3376b411b363SPhilipp Reisner /* Nowadays only used when forcing a node into primary role and 3377b411b363SPhilipp Reisner setting its disk to UpToDate with that */ 3378b411b363SPhilipp Reisner drbd_send_uuids(mdev); 3379b411b363SPhilipp Reisner drbd_send_state(mdev); 3380b411b363SPhilipp Reisner } 3381b411b363SPhilipp Reisner } 3382b411b363SPhilipp Reisner 338389e58e75SPhilipp Reisner mdev->tconn->net_conf->want_lose = 0; 3384b411b363SPhilipp Reisner 3385b411b363SPhilipp Reisner drbd_md_sync(mdev); /* update connected indicator, la_size, ... */ 3386b411b363SPhilipp Reisner 338781e84650SAndreas Gruenbacher return true; 3388b411b363SPhilipp Reisner } 3389b411b363SPhilipp Reisner 3390d8763023SAndreas Gruenbacher static int receive_sync_uuid(struct drbd_conf *mdev, enum drbd_packet cmd, 3391d8763023SAndreas Gruenbacher unsigned int data_size) 3392b411b363SPhilipp Reisner { 3393e42325a5SPhilipp Reisner struct p_rs_uuid *p = &mdev->tconn->data.rbuf.rs_uuid; 3394b411b363SPhilipp Reisner 3395b411b363SPhilipp Reisner wait_event(mdev->misc_wait, 3396b411b363SPhilipp Reisner mdev->state.conn == C_WF_SYNC_UUID || 3397c4752ef1SPhilipp Reisner mdev->state.conn == C_BEHIND || 3398b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED || 3399b411b363SPhilipp Reisner mdev->state.disk < D_NEGOTIATING); 3400b411b363SPhilipp Reisner 3401b411b363SPhilipp Reisner /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */ 3402b411b363SPhilipp Reisner 3403b411b363SPhilipp Reisner /* Here the _drbd_uuid_ functions are right, current should 3404b411b363SPhilipp Reisner _not_ be rotated into the history */ 3405b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_NEGOTIATING)) { 3406b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid)); 3407b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0UL); 3408b411b363SPhilipp Reisner 340962b0da3aSLars Ellenberg drbd_print_uuids(mdev, "updated sync uuid"); 3410b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_TARGET); 3411b411b363SPhilipp Reisner 3412b411b363SPhilipp Reisner put_ldev(mdev); 3413b411b363SPhilipp Reisner } else 3414b411b363SPhilipp Reisner dev_err(DEV, "Ignoring SyncUUID packet!\n"); 3415b411b363SPhilipp Reisner 341681e84650SAndreas Gruenbacher return true; 3417b411b363SPhilipp Reisner } 3418b411b363SPhilipp Reisner 34192c46407dSAndreas Gruenbacher /** 34202c46407dSAndreas Gruenbacher * receive_bitmap_plain 34212c46407dSAndreas Gruenbacher * 34222c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 34232c46407dSAndreas Gruenbacher * code upon failure. 34242c46407dSAndreas Gruenbacher */ 34252c46407dSAndreas Gruenbacher static int 342602918be2SPhilipp Reisner receive_bitmap_plain(struct drbd_conf *mdev, unsigned int data_size, 3427b411b363SPhilipp Reisner unsigned long *buffer, struct bm_xfer_ctx *c) 3428b411b363SPhilipp Reisner { 3429b411b363SPhilipp Reisner unsigned num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset); 3430b411b363SPhilipp Reisner unsigned want = num_words * sizeof(long); 34312c46407dSAndreas Gruenbacher int err; 3432b411b363SPhilipp Reisner 343302918be2SPhilipp Reisner if (want != data_size) { 343402918be2SPhilipp Reisner dev_err(DEV, "%s:want (%u) != data_size (%u)\n", __func__, want, data_size); 34352c46407dSAndreas Gruenbacher return -EIO; 3436b411b363SPhilipp Reisner } 3437b411b363SPhilipp Reisner if (want == 0) 34382c46407dSAndreas Gruenbacher return 0; 3439de0ff338SPhilipp Reisner err = drbd_recv(mdev->tconn, buffer, want); 34402c46407dSAndreas Gruenbacher if (err != want) { 34412c46407dSAndreas Gruenbacher if (err >= 0) 34422c46407dSAndreas Gruenbacher err = -EIO; 34432c46407dSAndreas Gruenbacher return err; 34442c46407dSAndreas Gruenbacher } 3445b411b363SPhilipp Reisner 3446b411b363SPhilipp Reisner drbd_bm_merge_lel(mdev, c->word_offset, num_words, buffer); 3447b411b363SPhilipp Reisner 3448b411b363SPhilipp Reisner c->word_offset += num_words; 3449b411b363SPhilipp Reisner c->bit_offset = c->word_offset * BITS_PER_LONG; 3450b411b363SPhilipp Reisner if (c->bit_offset > c->bm_bits) 3451b411b363SPhilipp Reisner c->bit_offset = c->bm_bits; 3452b411b363SPhilipp Reisner 34532c46407dSAndreas Gruenbacher return 1; 3454b411b363SPhilipp Reisner } 3455b411b363SPhilipp Reisner 34562c46407dSAndreas Gruenbacher /** 34572c46407dSAndreas Gruenbacher * recv_bm_rle_bits 34582c46407dSAndreas Gruenbacher * 34592c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 34602c46407dSAndreas Gruenbacher * code upon failure. 34612c46407dSAndreas Gruenbacher */ 34622c46407dSAndreas Gruenbacher static int 3463b411b363SPhilipp Reisner recv_bm_rle_bits(struct drbd_conf *mdev, 3464b411b363SPhilipp Reisner struct p_compressed_bm *p, 3465c6d25cfeSPhilipp Reisner struct bm_xfer_ctx *c, 3466c6d25cfeSPhilipp Reisner unsigned int len) 3467b411b363SPhilipp Reisner { 3468b411b363SPhilipp Reisner struct bitstream bs; 3469b411b363SPhilipp Reisner u64 look_ahead; 3470b411b363SPhilipp Reisner u64 rl; 3471b411b363SPhilipp Reisner u64 tmp; 3472b411b363SPhilipp Reisner unsigned long s = c->bit_offset; 3473b411b363SPhilipp Reisner unsigned long e; 3474b411b363SPhilipp Reisner int toggle = DCBP_get_start(p); 3475b411b363SPhilipp Reisner int have; 3476b411b363SPhilipp Reisner int bits; 3477b411b363SPhilipp Reisner 3478b411b363SPhilipp Reisner bitstream_init(&bs, p->code, len, DCBP_get_pad_bits(p)); 3479b411b363SPhilipp Reisner 3480b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &look_ahead, 64); 3481b411b363SPhilipp Reisner if (bits < 0) 34822c46407dSAndreas Gruenbacher return -EIO; 3483b411b363SPhilipp Reisner 3484b411b363SPhilipp Reisner for (have = bits; have > 0; s += rl, toggle = !toggle) { 3485b411b363SPhilipp Reisner bits = vli_decode_bits(&rl, look_ahead); 3486b411b363SPhilipp Reisner if (bits <= 0) 34872c46407dSAndreas Gruenbacher return -EIO; 3488b411b363SPhilipp Reisner 3489b411b363SPhilipp Reisner if (toggle) { 3490b411b363SPhilipp Reisner e = s + rl -1; 3491b411b363SPhilipp Reisner if (e >= c->bm_bits) { 3492b411b363SPhilipp Reisner dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); 34932c46407dSAndreas Gruenbacher return -EIO; 3494b411b363SPhilipp Reisner } 3495b411b363SPhilipp Reisner _drbd_bm_set_bits(mdev, s, e); 3496b411b363SPhilipp Reisner } 3497b411b363SPhilipp Reisner 3498b411b363SPhilipp Reisner if (have < bits) { 3499b411b363SPhilipp Reisner dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", 3500b411b363SPhilipp Reisner have, bits, look_ahead, 3501b411b363SPhilipp Reisner (unsigned int)(bs.cur.b - p->code), 3502b411b363SPhilipp Reisner (unsigned int)bs.buf_len); 35032c46407dSAndreas Gruenbacher return -EIO; 3504b411b363SPhilipp Reisner } 3505b411b363SPhilipp Reisner look_ahead >>= bits; 3506b411b363SPhilipp Reisner have -= bits; 3507b411b363SPhilipp Reisner 3508b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &tmp, 64 - have); 3509b411b363SPhilipp Reisner if (bits < 0) 35102c46407dSAndreas Gruenbacher return -EIO; 3511b411b363SPhilipp Reisner look_ahead |= tmp << have; 3512b411b363SPhilipp Reisner have += bits; 3513b411b363SPhilipp Reisner } 3514b411b363SPhilipp Reisner 3515b411b363SPhilipp Reisner c->bit_offset = s; 3516b411b363SPhilipp Reisner bm_xfer_ctx_bit_to_word_offset(c); 3517b411b363SPhilipp Reisner 35182c46407dSAndreas Gruenbacher return (s != c->bm_bits); 3519b411b363SPhilipp Reisner } 3520b411b363SPhilipp Reisner 35212c46407dSAndreas Gruenbacher /** 35222c46407dSAndreas Gruenbacher * decode_bitmap_c 35232c46407dSAndreas Gruenbacher * 35242c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 35252c46407dSAndreas Gruenbacher * code upon failure. 35262c46407dSAndreas Gruenbacher */ 35272c46407dSAndreas Gruenbacher static int 3528b411b363SPhilipp Reisner decode_bitmap_c(struct drbd_conf *mdev, 3529b411b363SPhilipp Reisner struct p_compressed_bm *p, 3530c6d25cfeSPhilipp Reisner struct bm_xfer_ctx *c, 3531c6d25cfeSPhilipp Reisner unsigned int len) 3532b411b363SPhilipp Reisner { 3533b411b363SPhilipp Reisner if (DCBP_get_code(p) == RLE_VLI_Bits) 3534c6d25cfeSPhilipp Reisner return recv_bm_rle_bits(mdev, p, c, len); 3535b411b363SPhilipp Reisner 3536b411b363SPhilipp Reisner /* other variants had been implemented for evaluation, 3537b411b363SPhilipp Reisner * but have been dropped as this one turned out to be "best" 3538b411b363SPhilipp Reisner * during all our tests. */ 3539b411b363SPhilipp Reisner 3540b411b363SPhilipp Reisner dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding); 3541b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); 35422c46407dSAndreas Gruenbacher return -EIO; 3543b411b363SPhilipp Reisner } 3544b411b363SPhilipp Reisner 3545b411b363SPhilipp Reisner void INFO_bm_xfer_stats(struct drbd_conf *mdev, 3546b411b363SPhilipp Reisner const char *direction, struct bm_xfer_ctx *c) 3547b411b363SPhilipp Reisner { 3548b411b363SPhilipp Reisner /* what would it take to transfer it "plaintext" */ 3549c012949aSPhilipp Reisner unsigned plain = sizeof(struct p_header) * 3550b411b363SPhilipp Reisner ((c->bm_words+BM_PACKET_WORDS-1)/BM_PACKET_WORDS+1) 3551b411b363SPhilipp Reisner + c->bm_words * sizeof(long); 3552b411b363SPhilipp Reisner unsigned total = c->bytes[0] + c->bytes[1]; 3553b411b363SPhilipp Reisner unsigned r; 3554b411b363SPhilipp Reisner 3555b411b363SPhilipp Reisner /* total can not be zero. but just in case: */ 3556b411b363SPhilipp Reisner if (total == 0) 3557b411b363SPhilipp Reisner return; 3558b411b363SPhilipp Reisner 3559b411b363SPhilipp Reisner /* don't report if not compressed */ 3560b411b363SPhilipp Reisner if (total >= plain) 3561b411b363SPhilipp Reisner return; 3562b411b363SPhilipp Reisner 3563b411b363SPhilipp Reisner /* total < plain. check for overflow, still */ 3564b411b363SPhilipp Reisner r = (total > UINT_MAX/1000) ? (total / (plain/1000)) 3565b411b363SPhilipp Reisner : (1000 * total / plain); 3566b411b363SPhilipp Reisner 3567b411b363SPhilipp Reisner if (r > 1000) 3568b411b363SPhilipp Reisner r = 1000; 3569b411b363SPhilipp Reisner 3570b411b363SPhilipp Reisner r = 1000 - r; 3571b411b363SPhilipp Reisner dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " 3572b411b363SPhilipp Reisner "total %u; compression: %u.%u%%\n", 3573b411b363SPhilipp Reisner direction, 3574b411b363SPhilipp Reisner c->bytes[1], c->packets[1], 3575b411b363SPhilipp Reisner c->bytes[0], c->packets[0], 3576b411b363SPhilipp Reisner total, r/10, r % 10); 3577b411b363SPhilipp Reisner } 3578b411b363SPhilipp Reisner 3579b411b363SPhilipp Reisner /* Since we are processing the bitfield from lower addresses to higher, 3580b411b363SPhilipp Reisner it does not matter if the process it in 32 bit chunks or 64 bit 3581b411b363SPhilipp Reisner chunks as long as it is little endian. (Understand it as byte stream, 3582b411b363SPhilipp Reisner beginning with the lowest byte...) If we would use big endian 3583b411b363SPhilipp Reisner we would need to process it from the highest address to the lowest, 3584b411b363SPhilipp Reisner in order to be agnostic to the 32 vs 64 bits issue. 3585b411b363SPhilipp Reisner 3586b411b363SPhilipp Reisner returns 0 on failure, 1 if we successfully received it. */ 3587d8763023SAndreas Gruenbacher static int receive_bitmap(struct drbd_conf *mdev, enum drbd_packet cmd, 3588d8763023SAndreas Gruenbacher unsigned int data_size) 3589b411b363SPhilipp Reisner { 3590b411b363SPhilipp Reisner struct bm_xfer_ctx c; 3591b411b363SPhilipp Reisner void *buffer; 35922c46407dSAndreas Gruenbacher int err; 359381e84650SAndreas Gruenbacher int ok = false; 3594257d0af6SPhilipp Reisner struct p_header *h = &mdev->tconn->data.rbuf.header; 359577351055SPhilipp Reisner struct packet_info pi; 3596b411b363SPhilipp Reisner 359720ceb2b2SLars Ellenberg drbd_bm_lock(mdev, "receive bitmap", BM_LOCKED_SET_ALLOWED); 359820ceb2b2SLars Ellenberg /* you are supposed to send additional out-of-sync information 359920ceb2b2SLars Ellenberg * if you actually set bits during this phase */ 3600b411b363SPhilipp Reisner 3601b411b363SPhilipp Reisner /* maybe we should use some per thread scratch page, 3602b411b363SPhilipp Reisner * and allocate that during initial device creation? */ 3603b411b363SPhilipp Reisner buffer = (unsigned long *) __get_free_page(GFP_NOIO); 3604b411b363SPhilipp Reisner if (!buffer) { 3605b411b363SPhilipp Reisner dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__); 3606b411b363SPhilipp Reisner goto out; 3607b411b363SPhilipp Reisner } 3608b411b363SPhilipp Reisner 3609b411b363SPhilipp Reisner c = (struct bm_xfer_ctx) { 3610b411b363SPhilipp Reisner .bm_bits = drbd_bm_bits(mdev), 3611b411b363SPhilipp Reisner .bm_words = drbd_bm_words(mdev), 3612b411b363SPhilipp Reisner }; 3613b411b363SPhilipp Reisner 36142c46407dSAndreas Gruenbacher for(;;) { 361502918be2SPhilipp Reisner if (cmd == P_BITMAP) { 36162c46407dSAndreas Gruenbacher err = receive_bitmap_plain(mdev, data_size, buffer, &c); 361702918be2SPhilipp Reisner } else if (cmd == P_COMPRESSED_BITMAP) { 3618b411b363SPhilipp Reisner /* MAYBE: sanity check that we speak proto >= 90, 3619b411b363SPhilipp Reisner * and the feature is enabled! */ 3620b411b363SPhilipp Reisner struct p_compressed_bm *p; 3621b411b363SPhilipp Reisner 362202918be2SPhilipp Reisner if (data_size > BM_PACKET_PAYLOAD_BYTES) { 3623b411b363SPhilipp Reisner dev_err(DEV, "ReportCBitmap packet too large\n"); 3624b411b363SPhilipp Reisner goto out; 3625b411b363SPhilipp Reisner } 3626b411b363SPhilipp Reisner /* use the page buff */ 3627b411b363SPhilipp Reisner p = buffer; 3628b411b363SPhilipp Reisner memcpy(p, h, sizeof(*h)); 3629de0ff338SPhilipp Reisner if (drbd_recv(mdev->tconn, p->head.payload, data_size) != data_size) 3630b411b363SPhilipp Reisner goto out; 3631004352faSLars Ellenberg if (data_size <= (sizeof(*p) - sizeof(p->head))) { 3632004352faSLars Ellenberg dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", data_size); 363378fcbdaeSAndreas Gruenbacher goto out; 3634b411b363SPhilipp Reisner } 3635c6d25cfeSPhilipp Reisner err = decode_bitmap_c(mdev, p, &c, data_size); 3636b411b363SPhilipp Reisner } else { 363702918be2SPhilipp Reisner dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", cmd); 3638b411b363SPhilipp Reisner goto out; 3639b411b363SPhilipp Reisner } 3640b411b363SPhilipp Reisner 364102918be2SPhilipp Reisner c.packets[cmd == P_BITMAP]++; 3642257d0af6SPhilipp Reisner c.bytes[cmd == P_BITMAP] += sizeof(struct p_header) + data_size; 3643b411b363SPhilipp Reisner 36442c46407dSAndreas Gruenbacher if (err <= 0) { 36452c46407dSAndreas Gruenbacher if (err < 0) 36462c46407dSAndreas Gruenbacher goto out; 3647b411b363SPhilipp Reisner break; 36482c46407dSAndreas Gruenbacher } 36499ba7aa00SPhilipp Reisner if (!drbd_recv_header(mdev->tconn, &pi)) 3650b411b363SPhilipp Reisner goto out; 365177351055SPhilipp Reisner cmd = pi.cmd; 365277351055SPhilipp Reisner data_size = pi.size; 36532c46407dSAndreas Gruenbacher } 3654b411b363SPhilipp Reisner 3655b411b363SPhilipp Reisner INFO_bm_xfer_stats(mdev, "receive", &c); 3656b411b363SPhilipp Reisner 3657b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_BITMAP_T) { 3658de1f8e4aSAndreas Gruenbacher enum drbd_state_rv rv; 3659de1f8e4aSAndreas Gruenbacher 3660b411b363SPhilipp Reisner ok = !drbd_send_bitmap(mdev); 3661b411b363SPhilipp Reisner if (!ok) 3662b411b363SPhilipp Reisner goto out; 3663b411b363SPhilipp Reisner /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ 3664de1f8e4aSAndreas Gruenbacher rv = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); 3665de1f8e4aSAndreas Gruenbacher D_ASSERT(rv == SS_SUCCESS); 3666b411b363SPhilipp Reisner } else if (mdev->state.conn != C_WF_BITMAP_S) { 3667b411b363SPhilipp Reisner /* admin may have requested C_DISCONNECTING, 3668b411b363SPhilipp Reisner * other threads may have noticed network errors */ 3669b411b363SPhilipp Reisner dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n", 3670b411b363SPhilipp Reisner drbd_conn_str(mdev->state.conn)); 3671b411b363SPhilipp Reisner } 3672b411b363SPhilipp Reisner 367381e84650SAndreas Gruenbacher ok = true; 3674b411b363SPhilipp Reisner out: 367520ceb2b2SLars Ellenberg drbd_bm_unlock(mdev); 3676b411b363SPhilipp Reisner if (ok && mdev->state.conn == C_WF_BITMAP_S) 3677b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_SOURCE); 3678b411b363SPhilipp Reisner free_page((unsigned long) buffer); 3679b411b363SPhilipp Reisner return ok; 3680b411b363SPhilipp Reisner } 3681b411b363SPhilipp Reisner 3682d8763023SAndreas Gruenbacher static int receive_skip(struct drbd_conf *mdev, enum drbd_packet cmd, 3683d8763023SAndreas Gruenbacher unsigned int data_size) 3684b411b363SPhilipp Reisner { 3685b411b363SPhilipp Reisner /* TODO zero copy sink :) */ 3686b411b363SPhilipp Reisner static char sink[128]; 3687b411b363SPhilipp Reisner int size, want, r; 3688b411b363SPhilipp Reisner 3689b411b363SPhilipp Reisner dev_warn(DEV, "skipping unknown optional packet type %d, l: %d!\n", 369002918be2SPhilipp Reisner cmd, data_size); 3691b411b363SPhilipp Reisner 369202918be2SPhilipp Reisner size = data_size; 3693b411b363SPhilipp Reisner while (size > 0) { 3694b411b363SPhilipp Reisner want = min_t(int, size, sizeof(sink)); 3695de0ff338SPhilipp Reisner r = drbd_recv(mdev->tconn, sink, want); 3696841ce241SAndreas Gruenbacher if (!expect(r > 0)) 3697841ce241SAndreas Gruenbacher break; 3698b411b363SPhilipp Reisner size -= r; 3699b411b363SPhilipp Reisner } 3700b411b363SPhilipp Reisner return size == 0; 3701b411b363SPhilipp Reisner } 3702b411b363SPhilipp Reisner 3703d8763023SAndreas Gruenbacher static int receive_UnplugRemote(struct drbd_conf *mdev, enum drbd_packet cmd, 3704d8763023SAndreas Gruenbacher unsigned int data_size) 3705b411b363SPhilipp Reisner { 3706b411b363SPhilipp Reisner /* Make sure we've acked all the TCP data associated 3707b411b363SPhilipp Reisner * with the data requests being unplugged */ 3708e42325a5SPhilipp Reisner drbd_tcp_quickack(mdev->tconn->data.socket); 3709b411b363SPhilipp Reisner 371081e84650SAndreas Gruenbacher return true; 3711b411b363SPhilipp Reisner } 3712b411b363SPhilipp Reisner 3713d8763023SAndreas Gruenbacher static int receive_out_of_sync(struct drbd_conf *mdev, enum drbd_packet cmd, 3714d8763023SAndreas Gruenbacher unsigned int data_size) 371573a01a18SPhilipp Reisner { 3716e42325a5SPhilipp Reisner struct p_block_desc *p = &mdev->tconn->data.rbuf.block_desc; 371773a01a18SPhilipp Reisner 3718f735e363SLars Ellenberg switch (mdev->state.conn) { 3719f735e363SLars Ellenberg case C_WF_SYNC_UUID: 3720f735e363SLars Ellenberg case C_WF_BITMAP_T: 3721f735e363SLars Ellenberg case C_BEHIND: 3722f735e363SLars Ellenberg break; 3723f735e363SLars Ellenberg default: 3724f735e363SLars Ellenberg dev_err(DEV, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n", 3725f735e363SLars Ellenberg drbd_conn_str(mdev->state.conn)); 3726f735e363SLars Ellenberg } 3727f735e363SLars Ellenberg 372873a01a18SPhilipp Reisner drbd_set_out_of_sync(mdev, be64_to_cpu(p->sector), be32_to_cpu(p->blksize)); 372973a01a18SPhilipp Reisner 373081e84650SAndreas Gruenbacher return true; 373173a01a18SPhilipp Reisner } 373273a01a18SPhilipp Reisner 3733d8763023SAndreas Gruenbacher typedef int (*drbd_cmd_handler_f)(struct drbd_conf *, enum drbd_packet cmd, 3734d8763023SAndreas Gruenbacher unsigned int to_receive); 3735b411b363SPhilipp Reisner 373602918be2SPhilipp Reisner struct data_cmd { 373702918be2SPhilipp Reisner int expect_payload; 373802918be2SPhilipp Reisner size_t pkt_size; 373902918be2SPhilipp Reisner drbd_cmd_handler_f function; 3740b411b363SPhilipp Reisner }; 3741b411b363SPhilipp Reisner 374202918be2SPhilipp Reisner static struct data_cmd drbd_cmd_handler[] = { 374302918be2SPhilipp Reisner [P_DATA] = { 1, sizeof(struct p_data), receive_Data }, 374402918be2SPhilipp Reisner [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply }, 374502918be2SPhilipp Reisner [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } , 374602918be2SPhilipp Reisner [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } , 3747257d0af6SPhilipp Reisner [P_BITMAP] = { 1, sizeof(struct p_header), receive_bitmap } , 3748257d0af6SPhilipp Reisner [P_COMPRESSED_BITMAP] = { 1, sizeof(struct p_header), receive_bitmap } , 3749257d0af6SPhilipp Reisner [P_UNPLUG_REMOTE] = { 0, sizeof(struct p_header), receive_UnplugRemote }, 375002918be2SPhilipp Reisner [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 375102918be2SPhilipp Reisner [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 3752257d0af6SPhilipp Reisner [P_SYNC_PARAM] = { 1, sizeof(struct p_header), receive_SyncParam }, 3753257d0af6SPhilipp Reisner [P_SYNC_PARAM89] = { 1, sizeof(struct p_header), receive_SyncParam }, 375402918be2SPhilipp Reisner [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol }, 375502918be2SPhilipp Reisner [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids }, 375602918be2SPhilipp Reisner [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes }, 375702918be2SPhilipp Reisner [P_STATE] = { 0, sizeof(struct p_state), receive_state }, 375802918be2SPhilipp Reisner [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state }, 375902918be2SPhilipp Reisner [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid }, 376002918be2SPhilipp Reisner [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 376102918be2SPhilipp Reisner [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 376202918be2SPhilipp Reisner [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 376302918be2SPhilipp Reisner [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip }, 376473a01a18SPhilipp Reisner [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync }, 376502918be2SPhilipp Reisner /* anything missing from this table is in 376602918be2SPhilipp Reisner * the asender_tbl, see get_asender_cmd */ 376702918be2SPhilipp Reisner [P_MAX_CMD] = { 0, 0, NULL }, 376802918be2SPhilipp Reisner }; 376902918be2SPhilipp Reisner 377002918be2SPhilipp Reisner /* All handler functions that expect a sub-header get that sub-heder in 3771e42325a5SPhilipp Reisner mdev->tconn->data.rbuf.header.head.payload. 377202918be2SPhilipp Reisner 3773e42325a5SPhilipp Reisner Usually in mdev->tconn->data.rbuf.header.head the callback can find the usual 377402918be2SPhilipp Reisner p_header, but they may not rely on that. Since there is also p_header95 ! 377502918be2SPhilipp Reisner */ 3776b411b363SPhilipp Reisner 3777eefc2f7dSPhilipp Reisner static void drbdd(struct drbd_tconn *tconn) 3778b411b363SPhilipp Reisner { 3779eefc2f7dSPhilipp Reisner struct p_header *header = &tconn->data.rbuf.header; 378077351055SPhilipp Reisner struct packet_info pi; 378102918be2SPhilipp Reisner size_t shs; /* sub header size */ 378202918be2SPhilipp Reisner int rv; 3783b411b363SPhilipp Reisner 3784eefc2f7dSPhilipp Reisner while (get_t_state(&tconn->receiver) == RUNNING) { 3785eefc2f7dSPhilipp Reisner drbd_thread_current_set_cpu(&tconn->receiver); 3786eefc2f7dSPhilipp Reisner if (!drbd_recv_header(tconn, &pi)) 378702918be2SPhilipp Reisner goto err_out; 378802918be2SPhilipp Reisner 378977351055SPhilipp Reisner if (unlikely(pi.cmd >= P_MAX_CMD || !drbd_cmd_handler[pi.cmd].function)) { 3790eefc2f7dSPhilipp Reisner conn_err(tconn, "unknown packet type %d, l: %d!\n", pi.cmd, pi.size); 379102918be2SPhilipp Reisner goto err_out; 37920b33a916SLars Ellenberg } 3793b411b363SPhilipp Reisner 379477351055SPhilipp Reisner shs = drbd_cmd_handler[pi.cmd].pkt_size - sizeof(struct p_header); 379577351055SPhilipp Reisner if (pi.size - shs > 0 && !drbd_cmd_handler[pi.cmd].expect_payload) { 3796eefc2f7dSPhilipp Reisner conn_err(tconn, "No payload expected %s l:%d\n", cmdname(pi.cmd), pi.size); 3797c13f7e1aSLars Ellenberg goto err_out; 3798c13f7e1aSLars Ellenberg } 3799c13f7e1aSLars Ellenberg 3800c13f7e1aSLars Ellenberg if (shs) { 3801eefc2f7dSPhilipp Reisner rv = drbd_recv(tconn, &header->payload, shs); 380202918be2SPhilipp Reisner if (unlikely(rv != shs)) { 38030ddc5549SLars Ellenberg if (!signal_pending(current)) 3804eefc2f7dSPhilipp Reisner conn_warn(tconn, "short read while reading sub header: rv=%d\n", rv); 380502918be2SPhilipp Reisner goto err_out; 3806b411b363SPhilipp Reisner } 380702918be2SPhilipp Reisner } 380802918be2SPhilipp Reisner 3809eefc2f7dSPhilipp Reisner rv = drbd_cmd_handler[pi.cmd].function(vnr_to_mdev(tconn, pi.vnr), pi.cmd, pi.size - shs); 381002918be2SPhilipp Reisner 381102918be2SPhilipp Reisner if (unlikely(!rv)) { 3812eefc2f7dSPhilipp Reisner conn_err(tconn, "error receiving %s, l: %d!\n", 381377351055SPhilipp Reisner cmdname(pi.cmd), pi.size); 381402918be2SPhilipp Reisner goto err_out; 3815b411b363SPhilipp Reisner } 3816b411b363SPhilipp Reisner } 381702918be2SPhilipp Reisner 381802918be2SPhilipp Reisner if (0) { 381902918be2SPhilipp Reisner err_out: 3820bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); 3821b411b363SPhilipp Reisner } 3822b411b363SPhilipp Reisner } 3823b411b363SPhilipp Reisner 3824a21e9298SPhilipp Reisner void drbd_flush_workqueue(struct drbd_conf *mdev) 3825b411b363SPhilipp Reisner { 3826b411b363SPhilipp Reisner struct drbd_wq_barrier barr; 3827b411b363SPhilipp Reisner 3828b411b363SPhilipp Reisner barr.w.cb = w_prev_work_done; 3829a21e9298SPhilipp Reisner barr.w.mdev = mdev; 3830b411b363SPhilipp Reisner init_completion(&barr.done); 3831a21e9298SPhilipp Reisner drbd_queue_work(&mdev->tconn->data.work, &barr.w); 3832b411b363SPhilipp Reisner wait_for_completion(&barr.done); 3833b411b363SPhilipp Reisner } 3834b411b363SPhilipp Reisner 3835360cc740SPhilipp Reisner static void drbd_disconnect(struct drbd_tconn *tconn) 3836b411b363SPhilipp Reisner { 3837bbeb641cSPhilipp Reisner enum drbd_conns oc; 3838b411b363SPhilipp Reisner int rv = SS_UNKNOWN_ERROR; 3839b411b363SPhilipp Reisner 3840bbeb641cSPhilipp Reisner if (tconn->cstate == C_STANDALONE) 3841b411b363SPhilipp Reisner return; 3842b411b363SPhilipp Reisner 3843b411b363SPhilipp Reisner /* asender does not clean up anything. it must not interfere, either */ 3844360cc740SPhilipp Reisner drbd_thread_stop(&tconn->asender); 3845360cc740SPhilipp Reisner drbd_free_sock(tconn); 3846360cc740SPhilipp Reisner 3847360cc740SPhilipp Reisner idr_for_each(&tconn->volumes, drbd_disconnected, tconn); 3848360cc740SPhilipp Reisner 3849360cc740SPhilipp Reisner conn_info(tconn, "Connection closed\n"); 3850360cc740SPhilipp Reisner 3851360cc740SPhilipp Reisner spin_lock_irq(&tconn->req_lock); 3852bbeb641cSPhilipp Reisner oc = tconn->cstate; 3853bbeb641cSPhilipp Reisner if (oc >= C_UNCONNECTED) 3854bbeb641cSPhilipp Reisner rv = _conn_request_state(tconn, NS(conn, C_UNCONNECTED), CS_VERBOSE); 3855bbeb641cSPhilipp Reisner 3856360cc740SPhilipp Reisner spin_unlock_irq(&tconn->req_lock); 3857360cc740SPhilipp Reisner 3858bbeb641cSPhilipp Reisner if (oc == C_DISCONNECTING) { 3859360cc740SPhilipp Reisner wait_event(tconn->net_cnt_wait, atomic_read(&tconn->net_cnt) == 0); 3860360cc740SPhilipp Reisner 3861360cc740SPhilipp Reisner crypto_free_hash(tconn->cram_hmac_tfm); 3862360cc740SPhilipp Reisner tconn->cram_hmac_tfm = NULL; 3863360cc740SPhilipp Reisner 3864360cc740SPhilipp Reisner kfree(tconn->net_conf); 3865360cc740SPhilipp Reisner tconn->net_conf = NULL; 3866bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_STANDALONE), CS_VERBOSE); 3867360cc740SPhilipp Reisner } 3868360cc740SPhilipp Reisner } 3869360cc740SPhilipp Reisner 3870360cc740SPhilipp Reisner static int drbd_disconnected(int vnr, void *p, void *data) 3871360cc740SPhilipp Reisner { 3872360cc740SPhilipp Reisner struct drbd_conf *mdev = (struct drbd_conf *)p; 3873360cc740SPhilipp Reisner enum drbd_fencing_p fp; 3874360cc740SPhilipp Reisner unsigned int i; 3875b411b363SPhilipp Reisner 387685719573SPhilipp Reisner /* wait for current activity to cease. */ 387787eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 3878b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 3879b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee); 3880b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->read_ee); 388187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3882b411b363SPhilipp Reisner 3883b411b363SPhilipp Reisner /* We do not have data structures that would allow us to 3884b411b363SPhilipp Reisner * get the rs_pending_cnt down to 0 again. 3885b411b363SPhilipp Reisner * * On C_SYNC_TARGET we do not have any data structures describing 3886b411b363SPhilipp Reisner * the pending RSDataRequest's we have sent. 3887b411b363SPhilipp Reisner * * On C_SYNC_SOURCE there is no data structure that tracks 3888b411b363SPhilipp Reisner * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. 3889b411b363SPhilipp Reisner * And no, it is not the sum of the reference counts in the 3890b411b363SPhilipp Reisner * resync_LRU. The resync_LRU tracks the whole operation including 3891b411b363SPhilipp Reisner * the disk-IO, while the rs_pending_cnt only tracks the blocks 3892b411b363SPhilipp Reisner * on the fly. */ 3893b411b363SPhilipp Reisner drbd_rs_cancel_all(mdev); 3894b411b363SPhilipp Reisner mdev->rs_total = 0; 3895b411b363SPhilipp Reisner mdev->rs_failed = 0; 3896b411b363SPhilipp Reisner atomic_set(&mdev->rs_pending_cnt, 0); 3897b411b363SPhilipp Reisner wake_up(&mdev->misc_wait); 3898b411b363SPhilipp Reisner 38997fde2be9SPhilipp Reisner del_timer(&mdev->request_timer); 39007fde2be9SPhilipp Reisner 3901b411b363SPhilipp Reisner /* make sure syncer is stopped and w_resume_next_sg queued */ 3902b411b363SPhilipp Reisner del_timer_sync(&mdev->resync_timer); 3903b411b363SPhilipp Reisner resync_timer_fn((unsigned long)mdev); 3904b411b363SPhilipp Reisner 3905b411b363SPhilipp Reisner /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, 3906b411b363SPhilipp Reisner * w_make_resync_request etc. which may still be on the worker queue 3907b411b363SPhilipp Reisner * to be "canceled" */ 3908a21e9298SPhilipp Reisner drbd_flush_workqueue(mdev); 3909b411b363SPhilipp Reisner 3910b411b363SPhilipp Reisner /* This also does reclaim_net_ee(). If we do this too early, we might 3911b411b363SPhilipp Reisner * miss some resync ee and pages.*/ 3912b411b363SPhilipp Reisner drbd_process_done_ee(mdev); 3913b411b363SPhilipp Reisner 3914b411b363SPhilipp Reisner kfree(mdev->p_uuid); 3915b411b363SPhilipp Reisner mdev->p_uuid = NULL; 3916b411b363SPhilipp Reisner 3917fb22c402SPhilipp Reisner if (!is_susp(mdev->state)) 3918b411b363SPhilipp Reisner tl_clear(mdev); 3919b411b363SPhilipp Reisner 3920b411b363SPhilipp Reisner drbd_md_sync(mdev); 3921b411b363SPhilipp Reisner 3922b411b363SPhilipp Reisner fp = FP_DONT_CARE; 3923b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3924b411b363SPhilipp Reisner fp = mdev->ldev->dc.fencing; 3925b411b363SPhilipp Reisner put_ldev(mdev); 3926b411b363SPhilipp Reisner } 3927b411b363SPhilipp Reisner 392887f7be4cSPhilipp Reisner if (mdev->state.role == R_PRIMARY && fp >= FP_RESOURCE && mdev->state.pdsk >= D_UNKNOWN) 392987f7be4cSPhilipp Reisner drbd_try_outdate_peer_async(mdev); 3930b411b363SPhilipp Reisner 393120ceb2b2SLars Ellenberg /* serialize with bitmap writeout triggered by the state change, 393220ceb2b2SLars Ellenberg * if any. */ 393320ceb2b2SLars Ellenberg wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags)); 393420ceb2b2SLars Ellenberg 3935b411b363SPhilipp Reisner /* tcp_close and release of sendpage pages can be deferred. I don't 3936b411b363SPhilipp Reisner * want to use SO_LINGER, because apparently it can be deferred for 3937b411b363SPhilipp Reisner * more than 20 seconds (longest time I checked). 3938b411b363SPhilipp Reisner * 3939b411b363SPhilipp Reisner * Actually we don't care for exactly when the network stack does its 3940b411b363SPhilipp Reisner * put_page(), but release our reference on these pages right here. 3941b411b363SPhilipp Reisner */ 3942b411b363SPhilipp Reisner i = drbd_release_ee(mdev, &mdev->net_ee); 3943b411b363SPhilipp Reisner if (i) 3944b411b363SPhilipp Reisner dev_info(DEV, "net_ee not empty, killed %u entries\n", i); 3945435f0740SLars Ellenberg i = atomic_read(&mdev->pp_in_use_by_net); 3946435f0740SLars Ellenberg if (i) 3947435f0740SLars Ellenberg dev_info(DEV, "pp_in_use_by_net = %d, expected 0\n", i); 3948b411b363SPhilipp Reisner i = atomic_read(&mdev->pp_in_use); 3949b411b363SPhilipp Reisner if (i) 395045bb912bSLars Ellenberg dev_info(DEV, "pp_in_use = %d, expected 0\n", i); 3951b411b363SPhilipp Reisner 3952b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->read_ee)); 3953b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->active_ee)); 3954b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->sync_ee)); 3955b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->done_ee)); 3956b411b363SPhilipp Reisner 3957b411b363SPhilipp Reisner /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ 3958b411b363SPhilipp Reisner atomic_set(&mdev->current_epoch->epoch_size, 0); 3959b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->current_epoch->list)); 3960360cc740SPhilipp Reisner 3961360cc740SPhilipp Reisner return 0; 3962b411b363SPhilipp Reisner } 3963b411b363SPhilipp Reisner 3964b411b363SPhilipp Reisner /* 3965b411b363SPhilipp Reisner * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version 3966b411b363SPhilipp Reisner * we can agree on is stored in agreed_pro_version. 3967b411b363SPhilipp Reisner * 3968b411b363SPhilipp Reisner * feature flags and the reserved array should be enough room for future 3969b411b363SPhilipp Reisner * enhancements of the handshake protocol, and possible plugins... 3970b411b363SPhilipp Reisner * 3971b411b363SPhilipp Reisner * for now, they are expected to be zero, but ignored. 3972b411b363SPhilipp Reisner */ 39738a22ccccSPhilipp Reisner static int drbd_send_handshake(struct drbd_tconn *tconn) 3974b411b363SPhilipp Reisner { 3975e6b3ea83SPhilipp Reisner /* ASSERT current == mdev->tconn->receiver ... */ 39768a22ccccSPhilipp Reisner struct p_handshake *p = &tconn->data.sbuf.handshake; 3977b411b363SPhilipp Reisner int ok; 3978b411b363SPhilipp Reisner 39798a22ccccSPhilipp Reisner if (mutex_lock_interruptible(&tconn->data.mutex)) { 39808a22ccccSPhilipp Reisner conn_err(tconn, "interrupted during initial handshake\n"); 3981b411b363SPhilipp Reisner return 0; /* interrupted. not ok. */ 3982b411b363SPhilipp Reisner } 3983b411b363SPhilipp Reisner 39848a22ccccSPhilipp Reisner if (tconn->data.socket == NULL) { 39858a22ccccSPhilipp Reisner mutex_unlock(&tconn->data.mutex); 3986b411b363SPhilipp Reisner return 0; 3987b411b363SPhilipp Reisner } 3988b411b363SPhilipp Reisner 3989b411b363SPhilipp Reisner memset(p, 0, sizeof(*p)); 3990b411b363SPhilipp Reisner p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); 3991b411b363SPhilipp Reisner p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); 39928a22ccccSPhilipp Reisner ok = _conn_send_cmd(tconn, 0, tconn->data.socket, P_HAND_SHAKE, 3993c012949aSPhilipp Reisner &p->head, sizeof(*p), 0); 39948a22ccccSPhilipp Reisner mutex_unlock(&tconn->data.mutex); 3995b411b363SPhilipp Reisner return ok; 3996b411b363SPhilipp Reisner } 3997b411b363SPhilipp Reisner 3998b411b363SPhilipp Reisner /* 3999b411b363SPhilipp Reisner * return values: 4000b411b363SPhilipp Reisner * 1 yes, we have a valid connection 4001b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 4002b411b363SPhilipp Reisner * -1 peer talks different language, 4003b411b363SPhilipp Reisner * no point in trying again, please go standalone. 4004b411b363SPhilipp Reisner */ 400565d11ed6SPhilipp Reisner static int drbd_do_handshake(struct drbd_tconn *tconn) 4006b411b363SPhilipp Reisner { 400765d11ed6SPhilipp Reisner /* ASSERT current == tconn->receiver ... */ 400865d11ed6SPhilipp Reisner struct p_handshake *p = &tconn->data.rbuf.handshake; 400902918be2SPhilipp Reisner const int expect = sizeof(struct p_handshake) - sizeof(struct p_header80); 401077351055SPhilipp Reisner struct packet_info pi; 4011b411b363SPhilipp Reisner int rv; 4012b411b363SPhilipp Reisner 401365d11ed6SPhilipp Reisner rv = drbd_send_handshake(tconn); 4014b411b363SPhilipp Reisner if (!rv) 4015b411b363SPhilipp Reisner return 0; 4016b411b363SPhilipp Reisner 401765d11ed6SPhilipp Reisner rv = drbd_recv_header(tconn, &pi); 4018b411b363SPhilipp Reisner if (!rv) 4019b411b363SPhilipp Reisner return 0; 4020b411b363SPhilipp Reisner 402177351055SPhilipp Reisner if (pi.cmd != P_HAND_SHAKE) { 402265d11ed6SPhilipp Reisner conn_err(tconn, "expected HandShake packet, received: %s (0x%04x)\n", 402377351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 4024b411b363SPhilipp Reisner return -1; 4025b411b363SPhilipp Reisner } 4026b411b363SPhilipp Reisner 402777351055SPhilipp Reisner if (pi.size != expect) { 402865d11ed6SPhilipp Reisner conn_err(tconn, "expected HandShake length: %u, received: %u\n", 402977351055SPhilipp Reisner expect, pi.size); 4030b411b363SPhilipp Reisner return -1; 4031b411b363SPhilipp Reisner } 4032b411b363SPhilipp Reisner 403365d11ed6SPhilipp Reisner rv = drbd_recv(tconn, &p->head.payload, expect); 4034b411b363SPhilipp Reisner 4035b411b363SPhilipp Reisner if (rv != expect) { 40360ddc5549SLars Ellenberg if (!signal_pending(current)) 403765d11ed6SPhilipp Reisner conn_warn(tconn, "short read receiving handshake packet: l=%u\n", rv); 4038b411b363SPhilipp Reisner return 0; 4039b411b363SPhilipp Reisner } 4040b411b363SPhilipp Reisner 4041b411b363SPhilipp Reisner p->protocol_min = be32_to_cpu(p->protocol_min); 4042b411b363SPhilipp Reisner p->protocol_max = be32_to_cpu(p->protocol_max); 4043b411b363SPhilipp Reisner if (p->protocol_max == 0) 4044b411b363SPhilipp Reisner p->protocol_max = p->protocol_min; 4045b411b363SPhilipp Reisner 4046b411b363SPhilipp Reisner if (PRO_VERSION_MAX < p->protocol_min || 4047b411b363SPhilipp Reisner PRO_VERSION_MIN > p->protocol_max) 4048b411b363SPhilipp Reisner goto incompat; 4049b411b363SPhilipp Reisner 405065d11ed6SPhilipp Reisner tconn->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); 4051b411b363SPhilipp Reisner 405265d11ed6SPhilipp Reisner conn_info(tconn, "Handshake successful: " 405365d11ed6SPhilipp Reisner "Agreed network protocol version %d\n", tconn->agreed_pro_version); 4054b411b363SPhilipp Reisner 4055b411b363SPhilipp Reisner return 1; 4056b411b363SPhilipp Reisner 4057b411b363SPhilipp Reisner incompat: 405865d11ed6SPhilipp Reisner conn_err(tconn, "incompatible DRBD dialects: " 4059b411b363SPhilipp Reisner "I support %d-%d, peer supports %d-%d\n", 4060b411b363SPhilipp Reisner PRO_VERSION_MIN, PRO_VERSION_MAX, 4061b411b363SPhilipp Reisner p->protocol_min, p->protocol_max); 4062b411b363SPhilipp Reisner return -1; 4063b411b363SPhilipp Reisner } 4064b411b363SPhilipp Reisner 4065b411b363SPhilipp Reisner #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) 406613e6037dSPhilipp Reisner static int drbd_do_auth(struct drbd_tconn *tconn) 4067b411b363SPhilipp Reisner { 4068b411b363SPhilipp Reisner dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); 4069b411b363SPhilipp Reisner dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); 4070b10d96cbSJohannes Thoma return -1; 4071b411b363SPhilipp Reisner } 4072b411b363SPhilipp Reisner #else 4073b411b363SPhilipp Reisner #define CHALLENGE_LEN 64 4074b10d96cbSJohannes Thoma 4075b10d96cbSJohannes Thoma /* Return value: 4076b10d96cbSJohannes Thoma 1 - auth succeeded, 4077b10d96cbSJohannes Thoma 0 - failed, try again (network error), 4078b10d96cbSJohannes Thoma -1 - auth failed, don't try again. 4079b10d96cbSJohannes Thoma */ 4080b10d96cbSJohannes Thoma 408113e6037dSPhilipp Reisner static int drbd_do_auth(struct drbd_tconn *tconn) 4082b411b363SPhilipp Reisner { 4083b411b363SPhilipp Reisner char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ 4084b411b363SPhilipp Reisner struct scatterlist sg; 4085b411b363SPhilipp Reisner char *response = NULL; 4086b411b363SPhilipp Reisner char *right_response = NULL; 4087b411b363SPhilipp Reisner char *peers_ch = NULL; 408813e6037dSPhilipp Reisner unsigned int key_len = strlen(tconn->net_conf->shared_secret); 4089b411b363SPhilipp Reisner unsigned int resp_size; 4090b411b363SPhilipp Reisner struct hash_desc desc; 409177351055SPhilipp Reisner struct packet_info pi; 4092b411b363SPhilipp Reisner int rv; 4093b411b363SPhilipp Reisner 409413e6037dSPhilipp Reisner desc.tfm = tconn->cram_hmac_tfm; 4095b411b363SPhilipp Reisner desc.flags = 0; 4096b411b363SPhilipp Reisner 409713e6037dSPhilipp Reisner rv = crypto_hash_setkey(tconn->cram_hmac_tfm, 409813e6037dSPhilipp Reisner (u8 *)tconn->net_conf->shared_secret, key_len); 4099b411b363SPhilipp Reisner if (rv) { 410013e6037dSPhilipp Reisner conn_err(tconn, "crypto_hash_setkey() failed with %d\n", rv); 4101b10d96cbSJohannes Thoma rv = -1; 4102b411b363SPhilipp Reisner goto fail; 4103b411b363SPhilipp Reisner } 4104b411b363SPhilipp Reisner 4105b411b363SPhilipp Reisner get_random_bytes(my_challenge, CHALLENGE_LEN); 4106b411b363SPhilipp Reisner 410713e6037dSPhilipp Reisner rv = conn_send_cmd2(tconn, P_AUTH_CHALLENGE, my_challenge, CHALLENGE_LEN); 4108b411b363SPhilipp Reisner if (!rv) 4109b411b363SPhilipp Reisner goto fail; 4110b411b363SPhilipp Reisner 411113e6037dSPhilipp Reisner rv = drbd_recv_header(tconn, &pi); 4112b411b363SPhilipp Reisner if (!rv) 4113b411b363SPhilipp Reisner goto fail; 4114b411b363SPhilipp Reisner 411577351055SPhilipp Reisner if (pi.cmd != P_AUTH_CHALLENGE) { 411613e6037dSPhilipp Reisner conn_err(tconn, "expected AuthChallenge packet, received: %s (0x%04x)\n", 411777351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 4118b411b363SPhilipp Reisner rv = 0; 4119b411b363SPhilipp Reisner goto fail; 4120b411b363SPhilipp Reisner } 4121b411b363SPhilipp Reisner 412277351055SPhilipp Reisner if (pi.size > CHALLENGE_LEN * 2) { 412313e6037dSPhilipp Reisner conn_err(tconn, "expected AuthChallenge payload too big.\n"); 4124b10d96cbSJohannes Thoma rv = -1; 4125b411b363SPhilipp Reisner goto fail; 4126b411b363SPhilipp Reisner } 4127b411b363SPhilipp Reisner 412877351055SPhilipp Reisner peers_ch = kmalloc(pi.size, GFP_NOIO); 4129b411b363SPhilipp Reisner if (peers_ch == NULL) { 413013e6037dSPhilipp Reisner conn_err(tconn, "kmalloc of peers_ch failed\n"); 4131b10d96cbSJohannes Thoma rv = -1; 4132b411b363SPhilipp Reisner goto fail; 4133b411b363SPhilipp Reisner } 4134b411b363SPhilipp Reisner 413513e6037dSPhilipp Reisner rv = drbd_recv(tconn, peers_ch, pi.size); 4136b411b363SPhilipp Reisner 413777351055SPhilipp Reisner if (rv != pi.size) { 41380ddc5549SLars Ellenberg if (!signal_pending(current)) 413913e6037dSPhilipp Reisner conn_warn(tconn, "short read AuthChallenge: l=%u\n", rv); 4140b411b363SPhilipp Reisner rv = 0; 4141b411b363SPhilipp Reisner goto fail; 4142b411b363SPhilipp Reisner } 4143b411b363SPhilipp Reisner 414413e6037dSPhilipp Reisner resp_size = crypto_hash_digestsize(tconn->cram_hmac_tfm); 4145b411b363SPhilipp Reisner response = kmalloc(resp_size, GFP_NOIO); 4146b411b363SPhilipp Reisner if (response == NULL) { 414713e6037dSPhilipp Reisner conn_err(tconn, "kmalloc of response failed\n"); 4148b10d96cbSJohannes Thoma rv = -1; 4149b411b363SPhilipp Reisner goto fail; 4150b411b363SPhilipp Reisner } 4151b411b363SPhilipp Reisner 4152b411b363SPhilipp Reisner sg_init_table(&sg, 1); 415377351055SPhilipp Reisner sg_set_buf(&sg, peers_ch, pi.size); 4154b411b363SPhilipp Reisner 4155b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, response); 4156b411b363SPhilipp Reisner if (rv) { 415713e6037dSPhilipp Reisner conn_err(tconn, "crypto_hash_digest() failed with %d\n", rv); 4158b10d96cbSJohannes Thoma rv = -1; 4159b411b363SPhilipp Reisner goto fail; 4160b411b363SPhilipp Reisner } 4161b411b363SPhilipp Reisner 416213e6037dSPhilipp Reisner rv = conn_send_cmd2(tconn, P_AUTH_RESPONSE, response, resp_size); 4163b411b363SPhilipp Reisner if (!rv) 4164b411b363SPhilipp Reisner goto fail; 4165b411b363SPhilipp Reisner 416613e6037dSPhilipp Reisner rv = drbd_recv_header(tconn, &pi); 4167b411b363SPhilipp Reisner if (!rv) 4168b411b363SPhilipp Reisner goto fail; 4169b411b363SPhilipp Reisner 417077351055SPhilipp Reisner if (pi.cmd != P_AUTH_RESPONSE) { 417113e6037dSPhilipp Reisner conn_err(tconn, "expected AuthResponse packet, received: %s (0x%04x)\n", 417277351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 4173b411b363SPhilipp Reisner rv = 0; 4174b411b363SPhilipp Reisner goto fail; 4175b411b363SPhilipp Reisner } 4176b411b363SPhilipp Reisner 417777351055SPhilipp Reisner if (pi.size != resp_size) { 417813e6037dSPhilipp Reisner conn_err(tconn, "expected AuthResponse payload of wrong size\n"); 4179b411b363SPhilipp Reisner rv = 0; 4180b411b363SPhilipp Reisner goto fail; 4181b411b363SPhilipp Reisner } 4182b411b363SPhilipp Reisner 418313e6037dSPhilipp Reisner rv = drbd_recv(tconn, response , resp_size); 4184b411b363SPhilipp Reisner 4185b411b363SPhilipp Reisner if (rv != resp_size) { 41860ddc5549SLars Ellenberg if (!signal_pending(current)) 418713e6037dSPhilipp Reisner conn_warn(tconn, "short read receiving AuthResponse: l=%u\n", rv); 4188b411b363SPhilipp Reisner rv = 0; 4189b411b363SPhilipp Reisner goto fail; 4190b411b363SPhilipp Reisner } 4191b411b363SPhilipp Reisner 4192b411b363SPhilipp Reisner right_response = kmalloc(resp_size, GFP_NOIO); 41932d1ee87dSJulia Lawall if (right_response == NULL) { 419413e6037dSPhilipp Reisner conn_err(tconn, "kmalloc of right_response failed\n"); 4195b10d96cbSJohannes Thoma rv = -1; 4196b411b363SPhilipp Reisner goto fail; 4197b411b363SPhilipp Reisner } 4198b411b363SPhilipp Reisner 4199b411b363SPhilipp Reisner sg_set_buf(&sg, my_challenge, CHALLENGE_LEN); 4200b411b363SPhilipp Reisner 4201b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, right_response); 4202b411b363SPhilipp Reisner if (rv) { 420313e6037dSPhilipp Reisner conn_err(tconn, "crypto_hash_digest() failed with %d\n", rv); 4204b10d96cbSJohannes Thoma rv = -1; 4205b411b363SPhilipp Reisner goto fail; 4206b411b363SPhilipp Reisner } 4207b411b363SPhilipp Reisner 4208b411b363SPhilipp Reisner rv = !memcmp(response, right_response, resp_size); 4209b411b363SPhilipp Reisner 4210b411b363SPhilipp Reisner if (rv) 421113e6037dSPhilipp Reisner conn_info(tconn, "Peer authenticated using %d bytes of '%s' HMAC\n", 421213e6037dSPhilipp Reisner resp_size, tconn->net_conf->cram_hmac_alg); 4213b10d96cbSJohannes Thoma else 4214b10d96cbSJohannes Thoma rv = -1; 4215b411b363SPhilipp Reisner 4216b411b363SPhilipp Reisner fail: 4217b411b363SPhilipp Reisner kfree(peers_ch); 4218b411b363SPhilipp Reisner kfree(response); 4219b411b363SPhilipp Reisner kfree(right_response); 4220b411b363SPhilipp Reisner 4221b411b363SPhilipp Reisner return rv; 4222b411b363SPhilipp Reisner } 4223b411b363SPhilipp Reisner #endif 4224b411b363SPhilipp Reisner 4225b411b363SPhilipp Reisner int drbdd_init(struct drbd_thread *thi) 4226b411b363SPhilipp Reisner { 4227392c8801SPhilipp Reisner struct drbd_tconn *tconn = thi->tconn; 4228b411b363SPhilipp Reisner int h; 4229b411b363SPhilipp Reisner 42304d641dd7SPhilipp Reisner conn_info(tconn, "receiver (re)started\n"); 4231b411b363SPhilipp Reisner 4232b411b363SPhilipp Reisner do { 42334d641dd7SPhilipp Reisner h = drbd_connect(tconn); 4234b411b363SPhilipp Reisner if (h == 0) { 42354d641dd7SPhilipp Reisner drbd_disconnect(tconn); 423620ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ); 4237b411b363SPhilipp Reisner } 4238b411b363SPhilipp Reisner if (h == -1) { 42394d641dd7SPhilipp Reisner conn_warn(tconn, "Discarding network configuration.\n"); 4240bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 4241b411b363SPhilipp Reisner } 4242b411b363SPhilipp Reisner } while (h == 0); 4243b411b363SPhilipp Reisner 4244b411b363SPhilipp Reisner if (h > 0) { 42454d641dd7SPhilipp Reisner if (get_net_conf(tconn)) { 42464d641dd7SPhilipp Reisner drbdd(tconn); 42474d641dd7SPhilipp Reisner put_net_conf(tconn); 4248b411b363SPhilipp Reisner } 4249b411b363SPhilipp Reisner } 4250b411b363SPhilipp Reisner 42514d641dd7SPhilipp Reisner drbd_disconnect(tconn); 4252b411b363SPhilipp Reisner 42534d641dd7SPhilipp Reisner conn_info(tconn, "receiver terminated\n"); 4254b411b363SPhilipp Reisner return 0; 4255b411b363SPhilipp Reisner } 4256b411b363SPhilipp Reisner 4257b411b363SPhilipp Reisner /* ********* acknowledge sender ******** */ 4258b411b363SPhilipp Reisner 4259d8763023SAndreas Gruenbacher static int got_RqSReply(struct drbd_conf *mdev, enum drbd_packet cmd) 4260b411b363SPhilipp Reisner { 4261257d0af6SPhilipp Reisner struct p_req_state_reply *p = &mdev->tconn->meta.rbuf.req_state_reply; 4262b411b363SPhilipp Reisner 4263b411b363SPhilipp Reisner int retcode = be32_to_cpu(p->retcode); 4264b411b363SPhilipp Reisner 4265b411b363SPhilipp Reisner if (retcode >= SS_SUCCESS) { 4266b411b363SPhilipp Reisner set_bit(CL_ST_CHG_SUCCESS, &mdev->flags); 4267b411b363SPhilipp Reisner } else { 4268b411b363SPhilipp Reisner set_bit(CL_ST_CHG_FAIL, &mdev->flags); 4269b411b363SPhilipp Reisner dev_err(DEV, "Requested state change failed by peer: %s (%d)\n", 4270b411b363SPhilipp Reisner drbd_set_st_err_str(retcode), retcode); 4271b411b363SPhilipp Reisner } 4272b411b363SPhilipp Reisner wake_up(&mdev->state_wait); 4273b411b363SPhilipp Reisner 427481e84650SAndreas Gruenbacher return true; 4275b411b363SPhilipp Reisner } 4276b411b363SPhilipp Reisner 4277d8763023SAndreas Gruenbacher static int got_Ping(struct drbd_conf *mdev, enum drbd_packet cmd) 4278b411b363SPhilipp Reisner { 42792a67d8b9SPhilipp Reisner return drbd_send_ping_ack(mdev->tconn); 4280b411b363SPhilipp Reisner 4281b411b363SPhilipp Reisner } 4282b411b363SPhilipp Reisner 4283d8763023SAndreas Gruenbacher static int got_PingAck(struct drbd_conf *mdev, enum drbd_packet cmd) 4284b411b363SPhilipp Reisner { 42852a67d8b9SPhilipp Reisner struct drbd_tconn *tconn = mdev->tconn; 4286b411b363SPhilipp Reisner /* restore idle timeout */ 42872a67d8b9SPhilipp Reisner tconn->meta.socket->sk->sk_rcvtimeo = tconn->net_conf->ping_int*HZ; 42882a67d8b9SPhilipp Reisner if (!test_and_set_bit(GOT_PING_ACK, &tconn->flags)) 42892a67d8b9SPhilipp Reisner wake_up(&tconn->ping_wait); 4290b411b363SPhilipp Reisner 429181e84650SAndreas Gruenbacher return true; 4292b411b363SPhilipp Reisner } 4293b411b363SPhilipp Reisner 4294d8763023SAndreas Gruenbacher static int got_IsInSync(struct drbd_conf *mdev, enum drbd_packet cmd) 4295b411b363SPhilipp Reisner { 4296257d0af6SPhilipp Reisner struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack; 4297b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4298b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4299b411b363SPhilipp Reisner 430031890f4aSPhilipp Reisner D_ASSERT(mdev->tconn->agreed_pro_version >= 89); 4301b411b363SPhilipp Reisner 4302b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4303b411b363SPhilipp Reisner 43041d53f09eSLars Ellenberg if (get_ldev(mdev)) { 4305b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4306b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4307b411b363SPhilipp Reisner /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ 4308b411b363SPhilipp Reisner mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); 43091d53f09eSLars Ellenberg put_ldev(mdev); 43101d53f09eSLars Ellenberg } 4311b411b363SPhilipp Reisner dec_rs_pending(mdev); 4312778f271dSPhilipp Reisner atomic_add(blksize >> 9, &mdev->rs_sect_in); 4313b411b363SPhilipp Reisner 431481e84650SAndreas Gruenbacher return true; 4315b411b363SPhilipp Reisner } 4316b411b363SPhilipp Reisner 4317bc9c5c41SAndreas Gruenbacher static int 4318bc9c5c41SAndreas Gruenbacher validate_req_change_req_state(struct drbd_conf *mdev, u64 id, sector_t sector, 4319bc9c5c41SAndreas Gruenbacher struct rb_root *root, const char *func, 4320bc9c5c41SAndreas Gruenbacher enum drbd_req_event what, bool missing_ok) 4321b411b363SPhilipp Reisner { 4322b411b363SPhilipp Reisner struct drbd_request *req; 4323b411b363SPhilipp Reisner struct bio_and_error m; 4324b411b363SPhilipp Reisner 432587eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 4326bc9c5c41SAndreas Gruenbacher req = find_request(mdev, root, id, sector, missing_ok, func); 4327b411b363SPhilipp Reisner if (unlikely(!req)) { 432887eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 432981e84650SAndreas Gruenbacher return false; 4330b411b363SPhilipp Reisner } 4331b411b363SPhilipp Reisner __req_mod(req, what, &m); 433287eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 4333b411b363SPhilipp Reisner 4334b411b363SPhilipp Reisner if (m.bio) 4335b411b363SPhilipp Reisner complete_master_bio(mdev, &m); 433681e84650SAndreas Gruenbacher return true; 4337b411b363SPhilipp Reisner } 4338b411b363SPhilipp Reisner 4339d8763023SAndreas Gruenbacher static int got_BlockAck(struct drbd_conf *mdev, enum drbd_packet cmd) 4340b411b363SPhilipp Reisner { 4341257d0af6SPhilipp Reisner struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack; 4342b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4343b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4344b411b363SPhilipp Reisner enum drbd_req_event what; 4345b411b363SPhilipp Reisner 4346b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4347b411b363SPhilipp Reisner 4348579b57edSAndreas Gruenbacher if (p->block_id == ID_SYNCER) { 4349b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4350b411b363SPhilipp Reisner dec_rs_pending(mdev); 435181e84650SAndreas Gruenbacher return true; 4352b411b363SPhilipp Reisner } 4353257d0af6SPhilipp Reisner switch (cmd) { 4354b411b363SPhilipp Reisner case P_RS_WRITE_ACK: 435589e58e75SPhilipp Reisner D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C); 43568554df1cSAndreas Gruenbacher what = WRITE_ACKED_BY_PEER_AND_SIS; 4357b411b363SPhilipp Reisner break; 4358b411b363SPhilipp Reisner case P_WRITE_ACK: 435989e58e75SPhilipp Reisner D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C); 43608554df1cSAndreas Gruenbacher what = WRITE_ACKED_BY_PEER; 4361b411b363SPhilipp Reisner break; 4362b411b363SPhilipp Reisner case P_RECV_ACK: 436389e58e75SPhilipp Reisner D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_B); 43648554df1cSAndreas Gruenbacher what = RECV_ACKED_BY_PEER; 4365b411b363SPhilipp Reisner break; 4366b411b363SPhilipp Reisner case P_DISCARD_ACK: 436789e58e75SPhilipp Reisner D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C); 43688554df1cSAndreas Gruenbacher what = CONFLICT_DISCARDED_BY_PEER; 4369b411b363SPhilipp Reisner break; 4370b411b363SPhilipp Reisner default: 4371b411b363SPhilipp Reisner D_ASSERT(0); 437281e84650SAndreas Gruenbacher return false; 4373b411b363SPhilipp Reisner } 4374b411b363SPhilipp Reisner 4375b411b363SPhilipp Reisner return validate_req_change_req_state(mdev, p->block_id, sector, 4376bc9c5c41SAndreas Gruenbacher &mdev->write_requests, __func__, 4377bc9c5c41SAndreas Gruenbacher what, false); 4378b411b363SPhilipp Reisner } 4379b411b363SPhilipp Reisner 4380d8763023SAndreas Gruenbacher static int got_NegAck(struct drbd_conf *mdev, enum drbd_packet cmd) 4381b411b363SPhilipp Reisner { 4382257d0af6SPhilipp Reisner struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack; 4383b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 43842deb8336SPhilipp Reisner int size = be32_to_cpu(p->blksize); 438589e58e75SPhilipp Reisner bool missing_ok = mdev->tconn->net_conf->wire_protocol == DRBD_PROT_A || 438689e58e75SPhilipp Reisner mdev->tconn->net_conf->wire_protocol == DRBD_PROT_B; 4387c3afd8f5SAndreas Gruenbacher bool found; 4388b411b363SPhilipp Reisner 4389b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4390b411b363SPhilipp Reisner 4391579b57edSAndreas Gruenbacher if (p->block_id == ID_SYNCER) { 4392b411b363SPhilipp Reisner dec_rs_pending(mdev); 4393b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 439481e84650SAndreas Gruenbacher return true; 4395b411b363SPhilipp Reisner } 43962deb8336SPhilipp Reisner 4397c3afd8f5SAndreas Gruenbacher found = validate_req_change_req_state(mdev, p->block_id, sector, 4398bc9c5c41SAndreas Gruenbacher &mdev->write_requests, __func__, 43998554df1cSAndreas Gruenbacher NEG_ACKED, missing_ok); 4400c3afd8f5SAndreas Gruenbacher if (!found) { 44012deb8336SPhilipp Reisner /* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs. 44022deb8336SPhilipp Reisner The master bio might already be completed, therefore the 4403c3afd8f5SAndreas Gruenbacher request is no longer in the collision hash. */ 44042deb8336SPhilipp Reisner /* In Protocol B we might already have got a P_RECV_ACK 44052deb8336SPhilipp Reisner but then get a P_NEG_ACK afterwards. */ 4406c3afd8f5SAndreas Gruenbacher if (!missing_ok) 44072deb8336SPhilipp Reisner return false; 4408c3afd8f5SAndreas Gruenbacher drbd_set_out_of_sync(mdev, sector, size); 44092deb8336SPhilipp Reisner } 44102deb8336SPhilipp Reisner return true; 4411b411b363SPhilipp Reisner } 4412b411b363SPhilipp Reisner 4413d8763023SAndreas Gruenbacher static int got_NegDReply(struct drbd_conf *mdev, enum drbd_packet cmd) 4414b411b363SPhilipp Reisner { 4415257d0af6SPhilipp Reisner struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack; 4416b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4417b411b363SPhilipp Reisner 4418b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4419b411b363SPhilipp Reisner dev_err(DEV, "Got NegDReply; Sector %llus, len %u; Fail original request.\n", 4420b411b363SPhilipp Reisner (unsigned long long)sector, be32_to_cpu(p->blksize)); 4421b411b363SPhilipp Reisner 4422b411b363SPhilipp Reisner return validate_req_change_req_state(mdev, p->block_id, sector, 4423bc9c5c41SAndreas Gruenbacher &mdev->read_requests, __func__, 44248554df1cSAndreas Gruenbacher NEG_ACKED, false); 4425b411b363SPhilipp Reisner } 4426b411b363SPhilipp Reisner 4427d8763023SAndreas Gruenbacher static int got_NegRSDReply(struct drbd_conf *mdev, enum drbd_packet cmd) 4428b411b363SPhilipp Reisner { 4429b411b363SPhilipp Reisner sector_t sector; 4430b411b363SPhilipp Reisner int size; 4431257d0af6SPhilipp Reisner struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack; 4432b411b363SPhilipp Reisner 4433b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4434b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4435b411b363SPhilipp Reisner 4436b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4437b411b363SPhilipp Reisner 4438b411b363SPhilipp Reisner dec_rs_pending(mdev); 4439b411b363SPhilipp Reisner 4440b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_FAILED)) { 4441b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4442257d0af6SPhilipp Reisner switch (cmd) { 4443d612d309SPhilipp Reisner case P_NEG_RS_DREPLY: 4444b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 4445d612d309SPhilipp Reisner case P_RS_CANCEL: 4446d612d309SPhilipp Reisner break; 4447d612d309SPhilipp Reisner default: 4448d612d309SPhilipp Reisner D_ASSERT(0); 4449d612d309SPhilipp Reisner put_ldev(mdev); 4450d612d309SPhilipp Reisner return false; 4451d612d309SPhilipp Reisner } 4452b411b363SPhilipp Reisner put_ldev(mdev); 4453b411b363SPhilipp Reisner } 4454b411b363SPhilipp Reisner 445581e84650SAndreas Gruenbacher return true; 4456b411b363SPhilipp Reisner } 4457b411b363SPhilipp Reisner 4458d8763023SAndreas Gruenbacher static int got_BarrierAck(struct drbd_conf *mdev, enum drbd_packet cmd) 4459b411b363SPhilipp Reisner { 4460257d0af6SPhilipp Reisner struct p_barrier_ack *p = &mdev->tconn->meta.rbuf.barrier_ack; 4461b411b363SPhilipp Reisner 4462b411b363SPhilipp Reisner tl_release(mdev, p->barrier, be32_to_cpu(p->set_size)); 4463b411b363SPhilipp Reisner 4464c4752ef1SPhilipp Reisner if (mdev->state.conn == C_AHEAD && 4465c4752ef1SPhilipp Reisner atomic_read(&mdev->ap_in_flight) == 0 && 4466370a43e7SPhilipp Reisner !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &mdev->current_epoch->flags)) { 4467370a43e7SPhilipp Reisner mdev->start_resync_timer.expires = jiffies + HZ; 4468370a43e7SPhilipp Reisner add_timer(&mdev->start_resync_timer); 4469c4752ef1SPhilipp Reisner } 4470c4752ef1SPhilipp Reisner 447181e84650SAndreas Gruenbacher return true; 4472b411b363SPhilipp Reisner } 4473b411b363SPhilipp Reisner 4474d8763023SAndreas Gruenbacher static int got_OVResult(struct drbd_conf *mdev, enum drbd_packet cmd) 4475b411b363SPhilipp Reisner { 4476257d0af6SPhilipp Reisner struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack; 4477b411b363SPhilipp Reisner struct drbd_work *w; 4478b411b363SPhilipp Reisner sector_t sector; 4479b411b363SPhilipp Reisner int size; 4480b411b363SPhilipp Reisner 4481b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4482b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4483b411b363SPhilipp Reisner 4484b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4485b411b363SPhilipp Reisner 4486b411b363SPhilipp Reisner if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) 4487b411b363SPhilipp Reisner drbd_ov_oos_found(mdev, sector, size); 4488b411b363SPhilipp Reisner else 4489b411b363SPhilipp Reisner ov_oos_print(mdev); 4490b411b363SPhilipp Reisner 44911d53f09eSLars Ellenberg if (!get_ldev(mdev)) 449281e84650SAndreas Gruenbacher return true; 44931d53f09eSLars Ellenberg 4494b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4495b411b363SPhilipp Reisner dec_rs_pending(mdev); 4496b411b363SPhilipp Reisner 4497ea5442afSLars Ellenberg --mdev->ov_left; 4498ea5442afSLars Ellenberg 4499ea5442afSLars Ellenberg /* let's advance progress step marks only for every other megabyte */ 4500ea5442afSLars Ellenberg if ((mdev->ov_left & 0x200) == 0x200) 4501ea5442afSLars Ellenberg drbd_advance_rs_marks(mdev, mdev->ov_left); 4502ea5442afSLars Ellenberg 4503ea5442afSLars Ellenberg if (mdev->ov_left == 0) { 4504b411b363SPhilipp Reisner w = kmalloc(sizeof(*w), GFP_NOIO); 4505b411b363SPhilipp Reisner if (w) { 4506b411b363SPhilipp Reisner w->cb = w_ov_finished; 4507a21e9298SPhilipp Reisner w->mdev = mdev; 4508e42325a5SPhilipp Reisner drbd_queue_work_front(&mdev->tconn->data.work, w); 4509b411b363SPhilipp Reisner } else { 4510b411b363SPhilipp Reisner dev_err(DEV, "kmalloc(w) failed."); 4511b411b363SPhilipp Reisner ov_oos_print(mdev); 4512b411b363SPhilipp Reisner drbd_resync_finished(mdev); 4513b411b363SPhilipp Reisner } 4514b411b363SPhilipp Reisner } 45151d53f09eSLars Ellenberg put_ldev(mdev); 451681e84650SAndreas Gruenbacher return true; 4517b411b363SPhilipp Reisner } 4518b411b363SPhilipp Reisner 4519d8763023SAndreas Gruenbacher static int got_skip(struct drbd_conf *mdev, enum drbd_packet cmd) 45200ced55a3SPhilipp Reisner { 452181e84650SAndreas Gruenbacher return true; 45220ced55a3SPhilipp Reisner } 45230ced55a3SPhilipp Reisner 4524b411b363SPhilipp Reisner struct asender_cmd { 4525b411b363SPhilipp Reisner size_t pkt_size; 4526d8763023SAndreas Gruenbacher int (*process)(struct drbd_conf *mdev, enum drbd_packet cmd); 4527b411b363SPhilipp Reisner }; 4528b411b363SPhilipp Reisner 4529b411b363SPhilipp Reisner static struct asender_cmd *get_asender_cmd(int cmd) 4530b411b363SPhilipp Reisner { 4531b411b363SPhilipp Reisner static struct asender_cmd asender_tbl[] = { 4532b411b363SPhilipp Reisner /* anything missing from this table is in 4533b411b363SPhilipp Reisner * the drbd_cmd_handler (drbd_default_handler) table, 4534b411b363SPhilipp Reisner * see the beginning of drbdd() */ 4535257d0af6SPhilipp Reisner [P_PING] = { sizeof(struct p_header), got_Ping }, 4536257d0af6SPhilipp Reisner [P_PING_ACK] = { sizeof(struct p_header), got_PingAck }, 4537b411b363SPhilipp Reisner [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4538b411b363SPhilipp Reisner [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4539b411b363SPhilipp Reisner [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4540b411b363SPhilipp Reisner [P_DISCARD_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4541b411b363SPhilipp Reisner [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, 4542b411b363SPhilipp Reisner [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, 4543b411b363SPhilipp Reisner [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply}, 4544b411b363SPhilipp Reisner [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, 4545b411b363SPhilipp Reisner [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, 4546b411b363SPhilipp Reisner [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, 4547b411b363SPhilipp Reisner [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, 454802918be2SPhilipp Reisner [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip }, 4549d612d309SPhilipp Reisner [P_RS_CANCEL] = { sizeof(struct p_block_ack), got_NegRSDReply}, 4550b411b363SPhilipp Reisner [P_MAX_CMD] = { 0, NULL }, 4551b411b363SPhilipp Reisner }; 4552b411b363SPhilipp Reisner if (cmd > P_MAX_CMD || asender_tbl[cmd].process == NULL) 4553b411b363SPhilipp Reisner return NULL; 4554b411b363SPhilipp Reisner return &asender_tbl[cmd]; 4555b411b363SPhilipp Reisner } 4556b411b363SPhilipp Reisner 455732862ec7SPhilipp Reisner static int _drbd_process_done_ee(int vnr, void *p, void *data) 455832862ec7SPhilipp Reisner { 455932862ec7SPhilipp Reisner struct drbd_conf *mdev = (struct drbd_conf *)p; 456032862ec7SPhilipp Reisner return !drbd_process_done_ee(mdev); 456132862ec7SPhilipp Reisner } 456232862ec7SPhilipp Reisner 456332862ec7SPhilipp Reisner static int _check_ee_empty(int vnr, void *p, void *data) 456432862ec7SPhilipp Reisner { 456532862ec7SPhilipp Reisner struct drbd_conf *mdev = (struct drbd_conf *)p; 456632862ec7SPhilipp Reisner struct drbd_tconn *tconn = mdev->tconn; 456732862ec7SPhilipp Reisner int not_empty; 456832862ec7SPhilipp Reisner 456932862ec7SPhilipp Reisner spin_lock_irq(&tconn->req_lock); 457032862ec7SPhilipp Reisner not_empty = !list_empty(&mdev->done_ee); 457132862ec7SPhilipp Reisner spin_unlock_irq(&tconn->req_lock); 457232862ec7SPhilipp Reisner 457332862ec7SPhilipp Reisner return not_empty; 457432862ec7SPhilipp Reisner } 457532862ec7SPhilipp Reisner 457632862ec7SPhilipp Reisner static int tconn_process_done_ee(struct drbd_tconn *tconn) 457732862ec7SPhilipp Reisner { 457832862ec7SPhilipp Reisner int not_empty, err; 457932862ec7SPhilipp Reisner 458032862ec7SPhilipp Reisner do { 458132862ec7SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &tconn->flags); 458232862ec7SPhilipp Reisner flush_signals(current); 458332862ec7SPhilipp Reisner err = idr_for_each(&tconn->volumes, _drbd_process_done_ee, NULL); 458432862ec7SPhilipp Reisner if (err) 458532862ec7SPhilipp Reisner return err; 458632862ec7SPhilipp Reisner set_bit(SIGNAL_ASENDER, &tconn->flags); 458732862ec7SPhilipp Reisner not_empty = idr_for_each(&tconn->volumes, _check_ee_empty, NULL); 458832862ec7SPhilipp Reisner } while (not_empty); 458932862ec7SPhilipp Reisner 459032862ec7SPhilipp Reisner return 0; 459132862ec7SPhilipp Reisner } 459232862ec7SPhilipp Reisner 4593b411b363SPhilipp Reisner int drbd_asender(struct drbd_thread *thi) 4594b411b363SPhilipp Reisner { 4595392c8801SPhilipp Reisner struct drbd_tconn *tconn = thi->tconn; 459632862ec7SPhilipp Reisner struct p_header *h = &tconn->meta.rbuf.header; 4597b411b363SPhilipp Reisner struct asender_cmd *cmd = NULL; 459877351055SPhilipp Reisner struct packet_info pi; 4599257d0af6SPhilipp Reisner int rv; 4600b411b363SPhilipp Reisner void *buf = h; 4601b411b363SPhilipp Reisner int received = 0; 4602257d0af6SPhilipp Reisner int expect = sizeof(struct p_header); 4603f36af18cSLars Ellenberg int ping_timeout_active = 0; 4604b411b363SPhilipp Reisner 4605b411b363SPhilipp Reisner current->policy = SCHED_RR; /* Make this a realtime task! */ 4606b411b363SPhilipp Reisner current->rt_priority = 2; /* more important than all other tasks */ 4607b411b363SPhilipp Reisner 4608e77a0a5cSAndreas Gruenbacher while (get_t_state(thi) == RUNNING) { 460980822284SPhilipp Reisner drbd_thread_current_set_cpu(thi); 461032862ec7SPhilipp Reisner if (test_and_clear_bit(SEND_PING, &tconn->flags)) { 46112a67d8b9SPhilipp Reisner if (!drbd_send_ping(tconn)) { 461232862ec7SPhilipp Reisner conn_err(tconn, "drbd_send_ping has failed\n"); 4613841ce241SAndreas Gruenbacher goto reconnect; 4614841ce241SAndreas Gruenbacher } 461532862ec7SPhilipp Reisner tconn->meta.socket->sk->sk_rcvtimeo = 461632862ec7SPhilipp Reisner tconn->net_conf->ping_timeo*HZ/10; 4617f36af18cSLars Ellenberg ping_timeout_active = 1; 4618b411b363SPhilipp Reisner } 4619b411b363SPhilipp Reisner 462032862ec7SPhilipp Reisner /* TODO: conditionally cork; it may hurt latency if we cork without 462132862ec7SPhilipp Reisner much to send */ 462232862ec7SPhilipp Reisner if (!tconn->net_conf->no_cork) 462332862ec7SPhilipp Reisner drbd_tcp_cork(tconn->meta.socket); 462432862ec7SPhilipp Reisner if (tconn_process_done_ee(tconn)) 4625b411b363SPhilipp Reisner goto reconnect; 4626b411b363SPhilipp Reisner /* but unconditionally uncork unless disabled */ 462732862ec7SPhilipp Reisner if (!tconn->net_conf->no_cork) 462832862ec7SPhilipp Reisner drbd_tcp_uncork(tconn->meta.socket); 4629b411b363SPhilipp Reisner 4630b411b363SPhilipp Reisner /* short circuit, recv_msg would return EINTR anyways. */ 4631b411b363SPhilipp Reisner if (signal_pending(current)) 4632b411b363SPhilipp Reisner continue; 4633b411b363SPhilipp Reisner 463432862ec7SPhilipp Reisner rv = drbd_recv_short(tconn->meta.socket, buf, expect-received, 0); 463532862ec7SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &tconn->flags); 4636b411b363SPhilipp Reisner 4637b411b363SPhilipp Reisner flush_signals(current); 4638b411b363SPhilipp Reisner 4639b411b363SPhilipp Reisner /* Note: 4640b411b363SPhilipp Reisner * -EINTR (on meta) we got a signal 4641b411b363SPhilipp Reisner * -EAGAIN (on meta) rcvtimeo expired 4642b411b363SPhilipp Reisner * -ECONNRESET other side closed the connection 4643b411b363SPhilipp Reisner * -ERESTARTSYS (on data) we got a signal 4644b411b363SPhilipp Reisner * rv < 0 other than above: unexpected error! 4645b411b363SPhilipp Reisner * rv == expected: full header or command 4646b411b363SPhilipp Reisner * rv < expected: "woken" by signal during receive 4647b411b363SPhilipp Reisner * rv == 0 : "connection shut down by peer" 4648b411b363SPhilipp Reisner */ 4649b411b363SPhilipp Reisner if (likely(rv > 0)) { 4650b411b363SPhilipp Reisner received += rv; 4651b411b363SPhilipp Reisner buf += rv; 4652b411b363SPhilipp Reisner } else if (rv == 0) { 465332862ec7SPhilipp Reisner conn_err(tconn, "meta connection shut down by peer.\n"); 4654b411b363SPhilipp Reisner goto reconnect; 4655b411b363SPhilipp Reisner } else if (rv == -EAGAIN) { 4656cb6518cbSLars Ellenberg /* If the data socket received something meanwhile, 4657cb6518cbSLars Ellenberg * that is good enough: peer is still alive. */ 465832862ec7SPhilipp Reisner if (time_after(tconn->last_received, 465932862ec7SPhilipp Reisner jiffies - tconn->meta.socket->sk->sk_rcvtimeo)) 4660cb6518cbSLars Ellenberg continue; 4661f36af18cSLars Ellenberg if (ping_timeout_active) { 466232862ec7SPhilipp Reisner conn_err(tconn, "PingAck did not arrive in time.\n"); 4663b411b363SPhilipp Reisner goto reconnect; 4664b411b363SPhilipp Reisner } 466532862ec7SPhilipp Reisner set_bit(SEND_PING, &tconn->flags); 4666b411b363SPhilipp Reisner continue; 4667b411b363SPhilipp Reisner } else if (rv == -EINTR) { 4668b411b363SPhilipp Reisner continue; 4669b411b363SPhilipp Reisner } else { 467032862ec7SPhilipp Reisner conn_err(tconn, "sock_recvmsg returned %d\n", rv); 4671b411b363SPhilipp Reisner goto reconnect; 4672b411b363SPhilipp Reisner } 4673b411b363SPhilipp Reisner 4674b411b363SPhilipp Reisner if (received == expect && cmd == NULL) { 467532862ec7SPhilipp Reisner if (!decode_header(tconn, h, &pi)) 4676b411b363SPhilipp Reisner goto reconnect; 467777351055SPhilipp Reisner cmd = get_asender_cmd(pi.cmd); 4678b411b363SPhilipp Reisner if (unlikely(cmd == NULL)) { 467932862ec7SPhilipp Reisner conn_err(tconn, "unknown command %d on meta (l: %d)\n", 468077351055SPhilipp Reisner pi.cmd, pi.size); 4681b411b363SPhilipp Reisner goto disconnect; 4682b411b363SPhilipp Reisner } 4683b411b363SPhilipp Reisner expect = cmd->pkt_size; 468477351055SPhilipp Reisner if (pi.size != expect - sizeof(struct p_header)) { 468532862ec7SPhilipp Reisner conn_err(tconn, "Wrong packet size on meta (c: %d, l: %d)\n", 468677351055SPhilipp Reisner pi.cmd, pi.size); 4687b411b363SPhilipp Reisner goto reconnect; 4688b411b363SPhilipp Reisner } 4689257d0af6SPhilipp Reisner } 4690b411b363SPhilipp Reisner if (received == expect) { 469132862ec7SPhilipp Reisner tconn->last_received = jiffies; 469232862ec7SPhilipp Reisner if (!cmd->process(vnr_to_mdev(tconn, pi.vnr), pi.cmd)) 4693b411b363SPhilipp Reisner goto reconnect; 4694b411b363SPhilipp Reisner 4695f36af18cSLars Ellenberg /* the idle_timeout (ping-int) 4696f36af18cSLars Ellenberg * has been restored in got_PingAck() */ 4697f36af18cSLars Ellenberg if (cmd == get_asender_cmd(P_PING_ACK)) 4698f36af18cSLars Ellenberg ping_timeout_active = 0; 4699f36af18cSLars Ellenberg 4700b411b363SPhilipp Reisner buf = h; 4701b411b363SPhilipp Reisner received = 0; 4702257d0af6SPhilipp Reisner expect = sizeof(struct p_header); 4703b411b363SPhilipp Reisner cmd = NULL; 4704b411b363SPhilipp Reisner } 4705b411b363SPhilipp Reisner } 4706b411b363SPhilipp Reisner 4707b411b363SPhilipp Reisner if (0) { 4708b411b363SPhilipp Reisner reconnect: 4709bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_NETWORK_FAILURE), CS_HARD); 4710b411b363SPhilipp Reisner } 4711b411b363SPhilipp Reisner if (0) { 4712b411b363SPhilipp Reisner disconnect: 4713bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 4714b411b363SPhilipp Reisner } 471532862ec7SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &tconn->flags); 4716b411b363SPhilipp Reisner 471732862ec7SPhilipp Reisner conn_info(tconn, "asender terminated\n"); 4718b411b363SPhilipp Reisner 4719b411b363SPhilipp Reisner return 0; 4720b411b363SPhilipp Reisner } 4721