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 63a4fbda8eSPhilipp Reisner enum mdev_or_conn { 64a4fbda8eSPhilipp Reisner MDEV, 65a4fbda8eSPhilipp Reisner CONN, 66a4fbda8eSPhilipp Reisner }; 67a4fbda8eSPhilipp Reisner 6865d11ed6SPhilipp Reisner static int drbd_do_handshake(struct drbd_tconn *tconn); 6913e6037dSPhilipp Reisner static int drbd_do_auth(struct drbd_tconn *tconn); 70360cc740SPhilipp Reisner static int drbd_disconnected(int vnr, void *p, void *data); 71b411b363SPhilipp Reisner 72b411b363SPhilipp Reisner static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *, struct drbd_epoch *, enum epoch_event); 7399920dc5SAndreas Gruenbacher static int e_end_block(struct drbd_work *, int); 74b411b363SPhilipp Reisner 75b411b363SPhilipp Reisner 76b411b363SPhilipp Reisner #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) 77b411b363SPhilipp Reisner 7845bb912bSLars Ellenberg /* 7945bb912bSLars Ellenberg * some helper functions to deal with single linked page lists, 8045bb912bSLars Ellenberg * page->private being our "next" pointer. 8145bb912bSLars Ellenberg */ 8245bb912bSLars Ellenberg 8345bb912bSLars Ellenberg /* If at least n pages are linked at head, get n pages off. 8445bb912bSLars Ellenberg * Otherwise, don't modify head, and return NULL. 8545bb912bSLars Ellenberg * Locking is the responsibility of the caller. 8645bb912bSLars Ellenberg */ 8745bb912bSLars Ellenberg static struct page *page_chain_del(struct page **head, int n) 8845bb912bSLars Ellenberg { 8945bb912bSLars Ellenberg struct page *page; 9045bb912bSLars Ellenberg struct page *tmp; 9145bb912bSLars Ellenberg 9245bb912bSLars Ellenberg BUG_ON(!n); 9345bb912bSLars Ellenberg BUG_ON(!head); 9445bb912bSLars Ellenberg 9545bb912bSLars Ellenberg page = *head; 9623ce4227SPhilipp Reisner 9723ce4227SPhilipp Reisner if (!page) 9823ce4227SPhilipp Reisner return NULL; 9923ce4227SPhilipp Reisner 10045bb912bSLars Ellenberg while (page) { 10145bb912bSLars Ellenberg tmp = page_chain_next(page); 10245bb912bSLars Ellenberg if (--n == 0) 10345bb912bSLars Ellenberg break; /* found sufficient pages */ 10445bb912bSLars Ellenberg if (tmp == NULL) 10545bb912bSLars Ellenberg /* insufficient pages, don't use any of them. */ 10645bb912bSLars Ellenberg return NULL; 10745bb912bSLars Ellenberg page = tmp; 10845bb912bSLars Ellenberg } 10945bb912bSLars Ellenberg 11045bb912bSLars Ellenberg /* add end of list marker for the returned list */ 11145bb912bSLars Ellenberg set_page_private(page, 0); 11245bb912bSLars Ellenberg /* actual return value, and adjustment of head */ 11345bb912bSLars Ellenberg page = *head; 11445bb912bSLars Ellenberg *head = tmp; 11545bb912bSLars Ellenberg return page; 11645bb912bSLars Ellenberg } 11745bb912bSLars Ellenberg 11845bb912bSLars Ellenberg /* may be used outside of locks to find the tail of a (usually short) 11945bb912bSLars Ellenberg * "private" page chain, before adding it back to a global chain head 12045bb912bSLars Ellenberg * with page_chain_add() under a spinlock. */ 12145bb912bSLars Ellenberg static struct page *page_chain_tail(struct page *page, int *len) 12245bb912bSLars Ellenberg { 12345bb912bSLars Ellenberg struct page *tmp; 12445bb912bSLars Ellenberg int i = 1; 12545bb912bSLars Ellenberg while ((tmp = page_chain_next(page))) 12645bb912bSLars Ellenberg ++i, page = tmp; 12745bb912bSLars Ellenberg if (len) 12845bb912bSLars Ellenberg *len = i; 12945bb912bSLars Ellenberg return page; 13045bb912bSLars Ellenberg } 13145bb912bSLars Ellenberg 13245bb912bSLars Ellenberg static int page_chain_free(struct page *page) 13345bb912bSLars Ellenberg { 13445bb912bSLars Ellenberg struct page *tmp; 13545bb912bSLars Ellenberg int i = 0; 13645bb912bSLars Ellenberg page_chain_for_each_safe(page, tmp) { 13745bb912bSLars Ellenberg put_page(page); 13845bb912bSLars Ellenberg ++i; 13945bb912bSLars Ellenberg } 14045bb912bSLars Ellenberg return i; 14145bb912bSLars Ellenberg } 14245bb912bSLars Ellenberg 14345bb912bSLars Ellenberg static void page_chain_add(struct page **head, 14445bb912bSLars Ellenberg struct page *chain_first, struct page *chain_last) 14545bb912bSLars Ellenberg { 14645bb912bSLars Ellenberg #if 1 14745bb912bSLars Ellenberg struct page *tmp; 14845bb912bSLars Ellenberg tmp = page_chain_tail(chain_first, NULL); 14945bb912bSLars Ellenberg BUG_ON(tmp != chain_last); 15045bb912bSLars Ellenberg #endif 15145bb912bSLars Ellenberg 15245bb912bSLars Ellenberg /* add chain to head */ 15345bb912bSLars Ellenberg set_page_private(chain_last, (unsigned long)*head); 15445bb912bSLars Ellenberg *head = chain_first; 15545bb912bSLars Ellenberg } 15645bb912bSLars Ellenberg 15745bb912bSLars Ellenberg static struct page *drbd_pp_first_pages_or_try_alloc(struct drbd_conf *mdev, int number) 158b411b363SPhilipp Reisner { 159b411b363SPhilipp Reisner struct page *page = NULL; 16045bb912bSLars Ellenberg struct page *tmp = NULL; 16145bb912bSLars Ellenberg int i = 0; 162b411b363SPhilipp Reisner 163b411b363SPhilipp Reisner /* Yes, testing drbd_pp_vacant outside the lock is racy. 164b411b363SPhilipp Reisner * So what. It saves a spin_lock. */ 16545bb912bSLars Ellenberg if (drbd_pp_vacant >= number) { 166b411b363SPhilipp Reisner spin_lock(&drbd_pp_lock); 16745bb912bSLars Ellenberg page = page_chain_del(&drbd_pp_pool, number); 16845bb912bSLars Ellenberg if (page) 16945bb912bSLars Ellenberg drbd_pp_vacant -= number; 170b411b363SPhilipp Reisner spin_unlock(&drbd_pp_lock); 17145bb912bSLars Ellenberg if (page) 17245bb912bSLars Ellenberg return page; 173b411b363SPhilipp Reisner } 17445bb912bSLars Ellenberg 175b411b363SPhilipp Reisner /* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD 176b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 177b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 17845bb912bSLars Ellenberg for (i = 0; i < number; i++) { 17945bb912bSLars Ellenberg tmp = alloc_page(GFP_TRY); 18045bb912bSLars Ellenberg if (!tmp) 18145bb912bSLars Ellenberg break; 18245bb912bSLars Ellenberg set_page_private(tmp, (unsigned long)page); 18345bb912bSLars Ellenberg page = tmp; 18445bb912bSLars Ellenberg } 18545bb912bSLars Ellenberg 18645bb912bSLars Ellenberg if (i == number) 187b411b363SPhilipp Reisner return page; 18845bb912bSLars Ellenberg 18945bb912bSLars Ellenberg /* Not enough pages immediately available this time. 19045bb912bSLars Ellenberg * No need to jump around here, drbd_pp_alloc will retry this 19145bb912bSLars Ellenberg * function "soon". */ 19245bb912bSLars Ellenberg if (page) { 19345bb912bSLars Ellenberg tmp = page_chain_tail(page, NULL); 19445bb912bSLars Ellenberg spin_lock(&drbd_pp_lock); 19545bb912bSLars Ellenberg page_chain_add(&drbd_pp_pool, page, tmp); 19645bb912bSLars Ellenberg drbd_pp_vacant += i; 19745bb912bSLars Ellenberg spin_unlock(&drbd_pp_lock); 19845bb912bSLars Ellenberg } 19945bb912bSLars Ellenberg return NULL; 200b411b363SPhilipp Reisner } 201b411b363SPhilipp Reisner 202b411b363SPhilipp Reisner static void reclaim_net_ee(struct drbd_conf *mdev, struct list_head *to_be_freed) 203b411b363SPhilipp Reisner { 204db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 205b411b363SPhilipp Reisner struct list_head *le, *tle; 206b411b363SPhilipp Reisner 207b411b363SPhilipp Reisner /* The EEs are always appended to the end of the list. Since 208b411b363SPhilipp Reisner they are sent in order over the wire, they have to finish 209b411b363SPhilipp Reisner in order. As soon as we see the first not finished we can 210b411b363SPhilipp Reisner stop to examine the list... */ 211b411b363SPhilipp Reisner 212b411b363SPhilipp Reisner list_for_each_safe(le, tle, &mdev->net_ee) { 213db830c46SAndreas Gruenbacher peer_req = list_entry(le, struct drbd_peer_request, w.list); 214db830c46SAndreas Gruenbacher if (drbd_ee_has_active_page(peer_req)) 215b411b363SPhilipp Reisner break; 216b411b363SPhilipp Reisner list_move(le, to_be_freed); 217b411b363SPhilipp Reisner } 218b411b363SPhilipp Reisner } 219b411b363SPhilipp Reisner 220b411b363SPhilipp Reisner static void drbd_kick_lo_and_reclaim_net(struct drbd_conf *mdev) 221b411b363SPhilipp Reisner { 222b411b363SPhilipp Reisner LIST_HEAD(reclaimed); 223db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req, *t; 224b411b363SPhilipp Reisner 22587eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 226b411b363SPhilipp Reisner reclaim_net_ee(mdev, &reclaimed); 22787eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 228b411b363SPhilipp Reisner 229db830c46SAndreas Gruenbacher list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) 230db830c46SAndreas Gruenbacher drbd_free_net_ee(mdev, peer_req); 231b411b363SPhilipp Reisner } 232b411b363SPhilipp Reisner 233b411b363SPhilipp Reisner /** 23445bb912bSLars Ellenberg * drbd_pp_alloc() - Returns @number pages, retries forever (or until signalled) 235b411b363SPhilipp Reisner * @mdev: DRBD device. 23645bb912bSLars Ellenberg * @number: number of pages requested 23745bb912bSLars Ellenberg * @retry: whether to retry, if not enough pages are available right now 238b411b363SPhilipp Reisner * 23945bb912bSLars Ellenberg * Tries to allocate number pages, first from our own page pool, then from 24045bb912bSLars Ellenberg * the kernel, unless this allocation would exceed the max_buffers setting. 24145bb912bSLars Ellenberg * Possibly retry until DRBD frees sufficient pages somewhere else. 24245bb912bSLars Ellenberg * 24345bb912bSLars Ellenberg * Returns a page chain linked via page->private. 244b411b363SPhilipp Reisner */ 24545bb912bSLars Ellenberg static struct page *drbd_pp_alloc(struct drbd_conf *mdev, unsigned number, bool retry) 246b411b363SPhilipp Reisner { 247b411b363SPhilipp Reisner struct page *page = NULL; 248b411b363SPhilipp Reisner DEFINE_WAIT(wait); 249b411b363SPhilipp Reisner 25045bb912bSLars Ellenberg /* Yes, we may run up to @number over max_buffers. If we 25145bb912bSLars Ellenberg * follow it strictly, the admin will get it wrong anyways. */ 25289e58e75SPhilipp Reisner if (atomic_read(&mdev->pp_in_use) < mdev->tconn->net_conf->max_buffers) 25345bb912bSLars Ellenberg page = drbd_pp_first_pages_or_try_alloc(mdev, number); 254b411b363SPhilipp Reisner 25545bb912bSLars Ellenberg while (page == NULL) { 256b411b363SPhilipp Reisner prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE); 257b411b363SPhilipp Reisner 258b411b363SPhilipp Reisner drbd_kick_lo_and_reclaim_net(mdev); 259b411b363SPhilipp Reisner 26089e58e75SPhilipp Reisner if (atomic_read(&mdev->pp_in_use) < mdev->tconn->net_conf->max_buffers) { 26145bb912bSLars Ellenberg page = drbd_pp_first_pages_or_try_alloc(mdev, number); 262b411b363SPhilipp Reisner if (page) 263b411b363SPhilipp Reisner break; 264b411b363SPhilipp Reisner } 265b411b363SPhilipp Reisner 266b411b363SPhilipp Reisner if (!retry) 267b411b363SPhilipp Reisner break; 268b411b363SPhilipp Reisner 269b411b363SPhilipp Reisner if (signal_pending(current)) { 270b411b363SPhilipp Reisner dev_warn(DEV, "drbd_pp_alloc interrupted!\n"); 271b411b363SPhilipp Reisner break; 272b411b363SPhilipp Reisner } 273b411b363SPhilipp Reisner 274b411b363SPhilipp Reisner schedule(); 275b411b363SPhilipp Reisner } 276b411b363SPhilipp Reisner finish_wait(&drbd_pp_wait, &wait); 277b411b363SPhilipp Reisner 27845bb912bSLars Ellenberg if (page) 27945bb912bSLars Ellenberg atomic_add(number, &mdev->pp_in_use); 280b411b363SPhilipp Reisner return page; 281b411b363SPhilipp Reisner } 282b411b363SPhilipp Reisner 283b411b363SPhilipp Reisner /* Must not be used from irq, as that may deadlock: see drbd_pp_alloc. 28487eeee41SPhilipp Reisner * Is also used from inside an other spin_lock_irq(&mdev->tconn->req_lock); 28545bb912bSLars Ellenberg * Either links the page chain back to the global pool, 28645bb912bSLars Ellenberg * or returns all pages to the system. */ 287435f0740SLars Ellenberg static void drbd_pp_free(struct drbd_conf *mdev, struct page *page, int is_net) 288b411b363SPhilipp Reisner { 289435f0740SLars Ellenberg atomic_t *a = is_net ? &mdev->pp_in_use_by_net : &mdev->pp_in_use; 290b411b363SPhilipp Reisner int i; 291435f0740SLars Ellenberg 2921816a2b4SLars Ellenberg if (drbd_pp_vacant > (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * minor_count) 29345bb912bSLars Ellenberg i = page_chain_free(page); 29445bb912bSLars Ellenberg else { 29545bb912bSLars Ellenberg struct page *tmp; 29645bb912bSLars Ellenberg tmp = page_chain_tail(page, &i); 297b411b363SPhilipp Reisner spin_lock(&drbd_pp_lock); 29845bb912bSLars Ellenberg page_chain_add(&drbd_pp_pool, page, tmp); 29945bb912bSLars Ellenberg drbd_pp_vacant += i; 300b411b363SPhilipp Reisner spin_unlock(&drbd_pp_lock); 301b411b363SPhilipp Reisner } 302435f0740SLars Ellenberg i = atomic_sub_return(i, a); 30345bb912bSLars Ellenberg if (i < 0) 304435f0740SLars Ellenberg dev_warn(DEV, "ASSERTION FAILED: %s: %d < 0\n", 305435f0740SLars Ellenberg is_net ? "pp_in_use_by_net" : "pp_in_use", i); 306b411b363SPhilipp Reisner wake_up(&drbd_pp_wait); 307b411b363SPhilipp Reisner } 308b411b363SPhilipp Reisner 309b411b363SPhilipp Reisner /* 310b411b363SPhilipp Reisner You need to hold the req_lock: 311b411b363SPhilipp Reisner _drbd_wait_ee_list_empty() 312b411b363SPhilipp Reisner 313b411b363SPhilipp Reisner You must not have the req_lock: 314b411b363SPhilipp Reisner drbd_free_ee() 315b411b363SPhilipp Reisner drbd_alloc_ee() 316b411b363SPhilipp Reisner drbd_init_ee() 317b411b363SPhilipp Reisner drbd_release_ee() 318b411b363SPhilipp Reisner drbd_ee_fix_bhs() 319b411b363SPhilipp Reisner drbd_process_done_ee() 320b411b363SPhilipp Reisner drbd_clear_done_ee() 321b411b363SPhilipp Reisner drbd_wait_ee_list_empty() 322b411b363SPhilipp Reisner */ 323b411b363SPhilipp Reisner 324f6ffca9fSAndreas Gruenbacher struct drbd_peer_request * 325f6ffca9fSAndreas Gruenbacher drbd_alloc_ee(struct drbd_conf *mdev, u64 id, sector_t sector, 326f6ffca9fSAndreas Gruenbacher unsigned int data_size, gfp_t gfp_mask) __must_hold(local) 327b411b363SPhilipp Reisner { 328db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 329b411b363SPhilipp Reisner struct page *page; 33045bb912bSLars Ellenberg unsigned nr_pages = (data_size + PAGE_SIZE -1) >> PAGE_SHIFT; 331b411b363SPhilipp Reisner 3320cf9d27eSAndreas Gruenbacher if (drbd_insert_fault(mdev, DRBD_FAULT_AL_EE)) 333b411b363SPhilipp Reisner return NULL; 334b411b363SPhilipp Reisner 335db830c46SAndreas Gruenbacher peer_req = mempool_alloc(drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM); 336db830c46SAndreas Gruenbacher if (!peer_req) { 337b411b363SPhilipp Reisner if (!(gfp_mask & __GFP_NOWARN)) 338b411b363SPhilipp Reisner dev_err(DEV, "alloc_ee: Allocation of an EE failed\n"); 339b411b363SPhilipp Reisner return NULL; 340b411b363SPhilipp Reisner } 341b411b363SPhilipp Reisner 34245bb912bSLars Ellenberg page = drbd_pp_alloc(mdev, nr_pages, (gfp_mask & __GFP_WAIT)); 34345bb912bSLars Ellenberg if (!page) 34445bb912bSLars Ellenberg goto fail; 345b411b363SPhilipp Reisner 346db830c46SAndreas Gruenbacher drbd_clear_interval(&peer_req->i); 347db830c46SAndreas Gruenbacher peer_req->i.size = data_size; 348db830c46SAndreas Gruenbacher peer_req->i.sector = sector; 349db830c46SAndreas Gruenbacher peer_req->i.local = false; 350db830c46SAndreas Gruenbacher peer_req->i.waiting = false; 35153840641SAndreas Gruenbacher 352db830c46SAndreas Gruenbacher peer_req->epoch = NULL; 353a21e9298SPhilipp Reisner peer_req->w.mdev = mdev; 354db830c46SAndreas Gruenbacher peer_req->pages = page; 355db830c46SAndreas Gruenbacher atomic_set(&peer_req->pending_bios, 0); 356db830c46SAndreas Gruenbacher peer_req->flags = 0; 3579a8e7753SAndreas Gruenbacher /* 3589a8e7753SAndreas Gruenbacher * The block_id is opaque to the receiver. It is not endianness 3599a8e7753SAndreas Gruenbacher * converted, and sent back to the sender unchanged. 3609a8e7753SAndreas Gruenbacher */ 361db830c46SAndreas Gruenbacher peer_req->block_id = id; 362b411b363SPhilipp Reisner 363db830c46SAndreas Gruenbacher return peer_req; 364b411b363SPhilipp Reisner 36545bb912bSLars Ellenberg fail: 366db830c46SAndreas Gruenbacher mempool_free(peer_req, drbd_ee_mempool); 367b411b363SPhilipp Reisner return NULL; 368b411b363SPhilipp Reisner } 369b411b363SPhilipp Reisner 370db830c46SAndreas Gruenbacher void drbd_free_some_ee(struct drbd_conf *mdev, struct drbd_peer_request *peer_req, 371f6ffca9fSAndreas Gruenbacher int is_net) 372b411b363SPhilipp Reisner { 373db830c46SAndreas Gruenbacher if (peer_req->flags & EE_HAS_DIGEST) 374db830c46SAndreas Gruenbacher kfree(peer_req->digest); 375db830c46SAndreas Gruenbacher drbd_pp_free(mdev, peer_req->pages, is_net); 376db830c46SAndreas Gruenbacher D_ASSERT(atomic_read(&peer_req->pending_bios) == 0); 377db830c46SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&peer_req->i)); 378db830c46SAndreas Gruenbacher mempool_free(peer_req, drbd_ee_mempool); 379b411b363SPhilipp Reisner } 380b411b363SPhilipp Reisner 381b411b363SPhilipp Reisner int drbd_release_ee(struct drbd_conf *mdev, struct list_head *list) 382b411b363SPhilipp Reisner { 383b411b363SPhilipp Reisner LIST_HEAD(work_list); 384db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req, *t; 385b411b363SPhilipp Reisner int count = 0; 386435f0740SLars Ellenberg int is_net = list == &mdev->net_ee; 387b411b363SPhilipp Reisner 38887eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 389b411b363SPhilipp Reisner list_splice_init(list, &work_list); 39087eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 391b411b363SPhilipp Reisner 392db830c46SAndreas Gruenbacher list_for_each_entry_safe(peer_req, t, &work_list, w.list) { 393db830c46SAndreas Gruenbacher drbd_free_some_ee(mdev, peer_req, is_net); 394b411b363SPhilipp Reisner count++; 395b411b363SPhilipp Reisner } 396b411b363SPhilipp Reisner return count; 397b411b363SPhilipp Reisner } 398b411b363SPhilipp Reisner 399b411b363SPhilipp Reisner 40032862ec7SPhilipp Reisner /* See also comments in _req_mod(,BARRIER_ACKED) 401b411b363SPhilipp Reisner * and receive_Barrier. 402b411b363SPhilipp Reisner * 403b411b363SPhilipp Reisner * Move entries from net_ee to done_ee, if ready. 404b411b363SPhilipp Reisner * Grab done_ee, call all callbacks, free the entries. 405b411b363SPhilipp Reisner * The callbacks typically send out ACKs. 406b411b363SPhilipp Reisner */ 407b411b363SPhilipp Reisner static int drbd_process_done_ee(struct drbd_conf *mdev) 408b411b363SPhilipp Reisner { 409b411b363SPhilipp Reisner LIST_HEAD(work_list); 410b411b363SPhilipp Reisner LIST_HEAD(reclaimed); 411db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req, *t; 412e2b3032bSAndreas Gruenbacher int err = 0; 413b411b363SPhilipp Reisner 41487eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 415b411b363SPhilipp Reisner reclaim_net_ee(mdev, &reclaimed); 416b411b363SPhilipp Reisner list_splice_init(&mdev->done_ee, &work_list); 41787eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 418b411b363SPhilipp Reisner 419db830c46SAndreas Gruenbacher list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) 420db830c46SAndreas Gruenbacher drbd_free_net_ee(mdev, peer_req); 421b411b363SPhilipp Reisner 422b411b363SPhilipp Reisner /* possible callbacks here: 4237be8da07SAndreas Gruenbacher * e_end_block, and e_end_resync_block, e_send_discard_write. 424b411b363SPhilipp Reisner * all ignore the last argument. 425b411b363SPhilipp Reisner */ 426db830c46SAndreas Gruenbacher list_for_each_entry_safe(peer_req, t, &work_list, w.list) { 427e2b3032bSAndreas Gruenbacher int err2; 428e2b3032bSAndreas Gruenbacher 429b411b363SPhilipp Reisner /* list_del not necessary, next/prev members not touched */ 430e2b3032bSAndreas Gruenbacher err2 = peer_req->w.cb(&peer_req->w, !!err); 431e2b3032bSAndreas Gruenbacher if (!err) 432e2b3032bSAndreas Gruenbacher err = err2; 433db830c46SAndreas Gruenbacher drbd_free_ee(mdev, peer_req); 434b411b363SPhilipp Reisner } 435b411b363SPhilipp Reisner wake_up(&mdev->ee_wait); 436b411b363SPhilipp Reisner 437e2b3032bSAndreas Gruenbacher return err; 438b411b363SPhilipp Reisner } 439b411b363SPhilipp Reisner 440b411b363SPhilipp Reisner void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head) 441b411b363SPhilipp Reisner { 442b411b363SPhilipp Reisner DEFINE_WAIT(wait); 443b411b363SPhilipp Reisner 444b411b363SPhilipp Reisner /* avoids spin_lock/unlock 445b411b363SPhilipp Reisner * and calling prepare_to_wait in the fast path */ 446b411b363SPhilipp Reisner while (!list_empty(head)) { 447b411b363SPhilipp Reisner prepare_to_wait(&mdev->ee_wait, &wait, TASK_UNINTERRUPTIBLE); 44887eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 4497eaceaccSJens Axboe io_schedule(); 450b411b363SPhilipp Reisner finish_wait(&mdev->ee_wait, &wait); 45187eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 452b411b363SPhilipp Reisner } 453b411b363SPhilipp Reisner } 454b411b363SPhilipp Reisner 455b411b363SPhilipp Reisner void drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head) 456b411b363SPhilipp Reisner { 45787eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 458b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, head); 45987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 460b411b363SPhilipp Reisner } 461b411b363SPhilipp Reisner 462b411b363SPhilipp Reisner /* see also kernel_accept; which is only present since 2.6.18. 463b411b363SPhilipp Reisner * also we want to log which part of it failed, exactly */ 4647653620dSPhilipp Reisner static int drbd_accept(const char **what, struct socket *sock, struct socket **newsock) 465b411b363SPhilipp Reisner { 466b411b363SPhilipp Reisner struct sock *sk = sock->sk; 467b411b363SPhilipp Reisner int err = 0; 468b411b363SPhilipp Reisner 469b411b363SPhilipp Reisner *what = "listen"; 470b411b363SPhilipp Reisner err = sock->ops->listen(sock, 5); 471b411b363SPhilipp Reisner if (err < 0) 472b411b363SPhilipp Reisner goto out; 473b411b363SPhilipp Reisner 474b411b363SPhilipp Reisner *what = "sock_create_lite"; 475b411b363SPhilipp Reisner err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, 476b411b363SPhilipp Reisner newsock); 477b411b363SPhilipp Reisner if (err < 0) 478b411b363SPhilipp Reisner goto out; 479b411b363SPhilipp Reisner 480b411b363SPhilipp Reisner *what = "accept"; 481b411b363SPhilipp Reisner err = sock->ops->accept(sock, *newsock, 0); 482b411b363SPhilipp Reisner if (err < 0) { 483b411b363SPhilipp Reisner sock_release(*newsock); 484b411b363SPhilipp Reisner *newsock = NULL; 485b411b363SPhilipp Reisner goto out; 486b411b363SPhilipp Reisner } 487b411b363SPhilipp Reisner (*newsock)->ops = sock->ops; 488b411b363SPhilipp Reisner 489b411b363SPhilipp Reisner out: 490b411b363SPhilipp Reisner return err; 491b411b363SPhilipp Reisner } 492b411b363SPhilipp Reisner 493dbd9eea0SPhilipp Reisner static int drbd_recv_short(struct socket *sock, void *buf, size_t size, int flags) 494b411b363SPhilipp Reisner { 495b411b363SPhilipp Reisner mm_segment_t oldfs; 496b411b363SPhilipp Reisner struct kvec iov = { 497b411b363SPhilipp Reisner .iov_base = buf, 498b411b363SPhilipp Reisner .iov_len = size, 499b411b363SPhilipp Reisner }; 500b411b363SPhilipp Reisner struct msghdr msg = { 501b411b363SPhilipp Reisner .msg_iovlen = 1, 502b411b363SPhilipp Reisner .msg_iov = (struct iovec *)&iov, 503b411b363SPhilipp Reisner .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) 504b411b363SPhilipp Reisner }; 505b411b363SPhilipp Reisner int rv; 506b411b363SPhilipp Reisner 507b411b363SPhilipp Reisner oldfs = get_fs(); 508b411b363SPhilipp Reisner set_fs(KERNEL_DS); 509b411b363SPhilipp Reisner rv = sock_recvmsg(sock, &msg, size, msg.msg_flags); 510b411b363SPhilipp Reisner set_fs(oldfs); 511b411b363SPhilipp Reisner 512b411b363SPhilipp Reisner return rv; 513b411b363SPhilipp Reisner } 514b411b363SPhilipp Reisner 515de0ff338SPhilipp Reisner static int drbd_recv(struct drbd_tconn *tconn, void *buf, size_t size) 516b411b363SPhilipp Reisner { 517b411b363SPhilipp Reisner mm_segment_t oldfs; 518b411b363SPhilipp Reisner struct kvec iov = { 519b411b363SPhilipp Reisner .iov_base = buf, 520b411b363SPhilipp Reisner .iov_len = size, 521b411b363SPhilipp Reisner }; 522b411b363SPhilipp Reisner struct msghdr msg = { 523b411b363SPhilipp Reisner .msg_iovlen = 1, 524b411b363SPhilipp Reisner .msg_iov = (struct iovec *)&iov, 525b411b363SPhilipp Reisner .msg_flags = MSG_WAITALL | MSG_NOSIGNAL 526b411b363SPhilipp Reisner }; 527b411b363SPhilipp Reisner int rv; 528b411b363SPhilipp Reisner 529b411b363SPhilipp Reisner oldfs = get_fs(); 530b411b363SPhilipp Reisner set_fs(KERNEL_DS); 531b411b363SPhilipp Reisner 532b411b363SPhilipp Reisner for (;;) { 533de0ff338SPhilipp Reisner rv = sock_recvmsg(tconn->data.socket, &msg, size, msg.msg_flags); 534b411b363SPhilipp Reisner if (rv == size) 535b411b363SPhilipp Reisner break; 536b411b363SPhilipp Reisner 537b411b363SPhilipp Reisner /* Note: 538b411b363SPhilipp Reisner * ECONNRESET other side closed the connection 539b411b363SPhilipp Reisner * ERESTARTSYS (on sock) we got a signal 540b411b363SPhilipp Reisner */ 541b411b363SPhilipp Reisner 542b411b363SPhilipp Reisner if (rv < 0) { 543b411b363SPhilipp Reisner if (rv == -ECONNRESET) 544de0ff338SPhilipp Reisner conn_info(tconn, "sock was reset by peer\n"); 545b411b363SPhilipp Reisner else if (rv != -ERESTARTSYS) 546de0ff338SPhilipp Reisner conn_err(tconn, "sock_recvmsg returned %d\n", rv); 547b411b363SPhilipp Reisner break; 548b411b363SPhilipp Reisner } else if (rv == 0) { 549de0ff338SPhilipp Reisner conn_info(tconn, "sock was shut down by peer\n"); 550b411b363SPhilipp Reisner break; 551b411b363SPhilipp Reisner } else { 552b411b363SPhilipp Reisner /* signal came in, or peer/link went down, 553b411b363SPhilipp Reisner * after we read a partial message 554b411b363SPhilipp Reisner */ 555b411b363SPhilipp Reisner /* D_ASSERT(signal_pending(current)); */ 556b411b363SPhilipp Reisner break; 557b411b363SPhilipp Reisner } 558b411b363SPhilipp Reisner }; 559b411b363SPhilipp Reisner 560b411b363SPhilipp Reisner set_fs(oldfs); 561b411b363SPhilipp Reisner 562b411b363SPhilipp Reisner if (rv != size) 563bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_BROKEN_PIPE), CS_HARD); 564b411b363SPhilipp Reisner 565b411b363SPhilipp Reisner return rv; 566b411b363SPhilipp Reisner } 567b411b363SPhilipp Reisner 5685dbf1673SLars Ellenberg /* quoting tcp(7): 5695dbf1673SLars Ellenberg * On individual connections, the socket buffer size must be set prior to the 5705dbf1673SLars Ellenberg * listen(2) or connect(2) calls in order to have it take effect. 5715dbf1673SLars Ellenberg * This is our wrapper to do so. 5725dbf1673SLars Ellenberg */ 5735dbf1673SLars Ellenberg static void drbd_setbufsize(struct socket *sock, unsigned int snd, 5745dbf1673SLars Ellenberg unsigned int rcv) 5755dbf1673SLars Ellenberg { 5765dbf1673SLars Ellenberg /* open coded SO_SNDBUF, SO_RCVBUF */ 5775dbf1673SLars Ellenberg if (snd) { 5785dbf1673SLars Ellenberg sock->sk->sk_sndbuf = snd; 5795dbf1673SLars Ellenberg sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 5805dbf1673SLars Ellenberg } 5815dbf1673SLars Ellenberg if (rcv) { 5825dbf1673SLars Ellenberg sock->sk->sk_rcvbuf = rcv; 5835dbf1673SLars Ellenberg sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 5845dbf1673SLars Ellenberg } 5855dbf1673SLars Ellenberg } 5865dbf1673SLars Ellenberg 587eac3e990SPhilipp Reisner static struct socket *drbd_try_connect(struct drbd_tconn *tconn) 588b411b363SPhilipp Reisner { 589b411b363SPhilipp Reisner const char *what; 590b411b363SPhilipp Reisner struct socket *sock; 591b411b363SPhilipp Reisner struct sockaddr_in6 src_in6; 592b411b363SPhilipp Reisner int err; 593b411b363SPhilipp Reisner int disconnect_on_error = 1; 594b411b363SPhilipp Reisner 595eac3e990SPhilipp Reisner if (!get_net_conf(tconn)) 596b411b363SPhilipp Reisner return NULL; 597b411b363SPhilipp Reisner 598b411b363SPhilipp Reisner what = "sock_create_kern"; 599eac3e990SPhilipp Reisner err = sock_create_kern(((struct sockaddr *)tconn->net_conf->my_addr)->sa_family, 600b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &sock); 601b411b363SPhilipp Reisner if (err < 0) { 602b411b363SPhilipp Reisner sock = NULL; 603b411b363SPhilipp Reisner goto out; 604b411b363SPhilipp Reisner } 605b411b363SPhilipp Reisner 606b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = 607eac3e990SPhilipp Reisner sock->sk->sk_sndtimeo = tconn->net_conf->try_connect_int*HZ; 608eac3e990SPhilipp Reisner drbd_setbufsize(sock, tconn->net_conf->sndbuf_size, 609eac3e990SPhilipp Reisner tconn->net_conf->rcvbuf_size); 610b411b363SPhilipp Reisner 611b411b363SPhilipp Reisner /* explicitly bind to the configured IP as source IP 612b411b363SPhilipp Reisner * for the outgoing connections. 613b411b363SPhilipp Reisner * This is needed for multihomed hosts and to be 614b411b363SPhilipp Reisner * able to use lo: interfaces for drbd. 615b411b363SPhilipp Reisner * Make sure to use 0 as port number, so linux selects 616b411b363SPhilipp Reisner * a free one dynamically. 617b411b363SPhilipp Reisner */ 618eac3e990SPhilipp Reisner memcpy(&src_in6, tconn->net_conf->my_addr, 619eac3e990SPhilipp Reisner min_t(int, tconn->net_conf->my_addr_len, sizeof(src_in6))); 620eac3e990SPhilipp Reisner if (((struct sockaddr *)tconn->net_conf->my_addr)->sa_family == AF_INET6) 621b411b363SPhilipp Reisner src_in6.sin6_port = 0; 622b411b363SPhilipp Reisner else 623b411b363SPhilipp Reisner ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ 624b411b363SPhilipp Reisner 625b411b363SPhilipp Reisner what = "bind before connect"; 626b411b363SPhilipp Reisner err = sock->ops->bind(sock, 627b411b363SPhilipp Reisner (struct sockaddr *) &src_in6, 628eac3e990SPhilipp Reisner tconn->net_conf->my_addr_len); 629b411b363SPhilipp Reisner if (err < 0) 630b411b363SPhilipp Reisner goto out; 631b411b363SPhilipp Reisner 632b411b363SPhilipp Reisner /* connect may fail, peer not yet available. 633b411b363SPhilipp Reisner * stay C_WF_CONNECTION, don't go Disconnecting! */ 634b411b363SPhilipp Reisner disconnect_on_error = 0; 635b411b363SPhilipp Reisner what = "connect"; 636b411b363SPhilipp Reisner err = sock->ops->connect(sock, 637eac3e990SPhilipp Reisner (struct sockaddr *)tconn->net_conf->peer_addr, 638eac3e990SPhilipp Reisner tconn->net_conf->peer_addr_len, 0); 639b411b363SPhilipp Reisner 640b411b363SPhilipp Reisner out: 641b411b363SPhilipp Reisner if (err < 0) { 642b411b363SPhilipp Reisner if (sock) { 643b411b363SPhilipp Reisner sock_release(sock); 644b411b363SPhilipp Reisner sock = NULL; 645b411b363SPhilipp Reisner } 646b411b363SPhilipp Reisner switch (-err) { 647b411b363SPhilipp Reisner /* timeout, busy, signal pending */ 648b411b363SPhilipp Reisner case ETIMEDOUT: case EAGAIN: case EINPROGRESS: 649b411b363SPhilipp Reisner case EINTR: case ERESTARTSYS: 650b411b363SPhilipp Reisner /* peer not (yet) available, network problem */ 651b411b363SPhilipp Reisner case ECONNREFUSED: case ENETUNREACH: 652b411b363SPhilipp Reisner case EHOSTDOWN: case EHOSTUNREACH: 653b411b363SPhilipp Reisner disconnect_on_error = 0; 654b411b363SPhilipp Reisner break; 655b411b363SPhilipp Reisner default: 656eac3e990SPhilipp Reisner conn_err(tconn, "%s failed, err = %d\n", what, err); 657b411b363SPhilipp Reisner } 658b411b363SPhilipp Reisner if (disconnect_on_error) 659bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 660b411b363SPhilipp Reisner } 661eac3e990SPhilipp Reisner put_net_conf(tconn); 662b411b363SPhilipp Reisner return sock; 663b411b363SPhilipp Reisner } 664b411b363SPhilipp Reisner 6657653620dSPhilipp Reisner static struct socket *drbd_wait_for_connect(struct drbd_tconn *tconn) 666b411b363SPhilipp Reisner { 667b411b363SPhilipp Reisner int timeo, err; 668b411b363SPhilipp Reisner struct socket *s_estab = NULL, *s_listen; 669b411b363SPhilipp Reisner const char *what; 670b411b363SPhilipp Reisner 6717653620dSPhilipp Reisner if (!get_net_conf(tconn)) 672b411b363SPhilipp Reisner return NULL; 673b411b363SPhilipp Reisner 674b411b363SPhilipp Reisner what = "sock_create_kern"; 6757653620dSPhilipp Reisner err = sock_create_kern(((struct sockaddr *)tconn->net_conf->my_addr)->sa_family, 676b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &s_listen); 677b411b363SPhilipp Reisner if (err) { 678b411b363SPhilipp Reisner s_listen = NULL; 679b411b363SPhilipp Reisner goto out; 680b411b363SPhilipp Reisner } 681b411b363SPhilipp Reisner 6827653620dSPhilipp Reisner timeo = tconn->net_conf->try_connect_int * HZ; 683b411b363SPhilipp Reisner timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */ 684b411b363SPhilipp Reisner 685b411b363SPhilipp Reisner s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */ 686b411b363SPhilipp Reisner s_listen->sk->sk_rcvtimeo = timeo; 687b411b363SPhilipp Reisner s_listen->sk->sk_sndtimeo = timeo; 6887653620dSPhilipp Reisner drbd_setbufsize(s_listen, tconn->net_conf->sndbuf_size, 6897653620dSPhilipp Reisner tconn->net_conf->rcvbuf_size); 690b411b363SPhilipp Reisner 691b411b363SPhilipp Reisner what = "bind before listen"; 692b411b363SPhilipp Reisner err = s_listen->ops->bind(s_listen, 6937653620dSPhilipp Reisner (struct sockaddr *) tconn->net_conf->my_addr, 6947653620dSPhilipp Reisner tconn->net_conf->my_addr_len); 695b411b363SPhilipp Reisner if (err < 0) 696b411b363SPhilipp Reisner goto out; 697b411b363SPhilipp Reisner 6987653620dSPhilipp Reisner err = drbd_accept(&what, s_listen, &s_estab); 699b411b363SPhilipp Reisner 700b411b363SPhilipp Reisner out: 701b411b363SPhilipp Reisner if (s_listen) 702b411b363SPhilipp Reisner sock_release(s_listen); 703b411b363SPhilipp Reisner if (err < 0) { 704b411b363SPhilipp Reisner if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { 7057653620dSPhilipp Reisner conn_err(tconn, "%s failed, err = %d\n", what, err); 706bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 707b411b363SPhilipp Reisner } 708b411b363SPhilipp Reisner } 7097653620dSPhilipp Reisner put_net_conf(tconn); 710b411b363SPhilipp Reisner 711b411b363SPhilipp Reisner return s_estab; 712b411b363SPhilipp Reisner } 713b411b363SPhilipp Reisner 714d38e787eSPhilipp Reisner static int drbd_send_fp(struct drbd_tconn *tconn, struct socket *sock, enum drbd_packet cmd) 715b411b363SPhilipp Reisner { 716d38e787eSPhilipp Reisner struct p_header *h = &tconn->data.sbuf.header; 717b411b363SPhilipp Reisner 718ecf2363cSAndreas Gruenbacher return !_conn_send_cmd(tconn, 0, sock, cmd, h, sizeof(*h), 0); 719b411b363SPhilipp Reisner } 720b411b363SPhilipp Reisner 721a25b63f1SPhilipp Reisner static enum drbd_packet drbd_recv_fp(struct drbd_tconn *tconn, struct socket *sock) 722b411b363SPhilipp Reisner { 723a25b63f1SPhilipp Reisner struct p_header80 *h = &tconn->data.rbuf.header.h80; 724b411b363SPhilipp Reisner int rr; 725b411b363SPhilipp Reisner 726dbd9eea0SPhilipp Reisner rr = drbd_recv_short(sock, h, sizeof(*h), 0); 727b411b363SPhilipp Reisner 728ca9bc12bSAndreas Gruenbacher if (rr == sizeof(*h) && h->magic == cpu_to_be32(DRBD_MAGIC)) 729b411b363SPhilipp Reisner return be16_to_cpu(h->command); 730b411b363SPhilipp Reisner 731b411b363SPhilipp Reisner return 0xffff; 732b411b363SPhilipp Reisner } 733b411b363SPhilipp Reisner 734b411b363SPhilipp Reisner /** 735b411b363SPhilipp Reisner * drbd_socket_okay() - Free the socket if its connection is not okay 736b411b363SPhilipp Reisner * @sock: pointer to the pointer to the socket. 737b411b363SPhilipp Reisner */ 738dbd9eea0SPhilipp Reisner static int drbd_socket_okay(struct socket **sock) 739b411b363SPhilipp Reisner { 740b411b363SPhilipp Reisner int rr; 741b411b363SPhilipp Reisner char tb[4]; 742b411b363SPhilipp Reisner 743b411b363SPhilipp Reisner if (!*sock) 74481e84650SAndreas Gruenbacher return false; 745b411b363SPhilipp Reisner 746dbd9eea0SPhilipp Reisner rr = drbd_recv_short(*sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); 747b411b363SPhilipp Reisner 748b411b363SPhilipp Reisner if (rr > 0 || rr == -EAGAIN) { 74981e84650SAndreas Gruenbacher return true; 750b411b363SPhilipp Reisner } else { 751b411b363SPhilipp Reisner sock_release(*sock); 752b411b363SPhilipp Reisner *sock = NULL; 75381e84650SAndreas Gruenbacher return false; 754b411b363SPhilipp Reisner } 755b411b363SPhilipp Reisner } 7562325eb66SPhilipp Reisner /* Gets called if a connection is established, or if a new minor gets created 7572325eb66SPhilipp Reisner in a connection */ 7582325eb66SPhilipp Reisner int drbd_connected(int vnr, void *p, void *data) 759907599e0SPhilipp Reisner { 760907599e0SPhilipp Reisner struct drbd_conf *mdev = (struct drbd_conf *)p; 761907599e0SPhilipp Reisner int ok = 1; 762907599e0SPhilipp Reisner 763907599e0SPhilipp Reisner atomic_set(&mdev->packet_seq, 0); 764907599e0SPhilipp Reisner mdev->peer_seq = 0; 765907599e0SPhilipp Reisner 7668410da8fSPhilipp Reisner mdev->state_mutex = mdev->tconn->agreed_pro_version < 100 ? 7678410da8fSPhilipp Reisner &mdev->tconn->cstate_mutex : 7688410da8fSPhilipp Reisner &mdev->own_state_mutex; 7698410da8fSPhilipp Reisner 770103ea275SAndreas Gruenbacher ok &= !drbd_send_sync_param(mdev); 771f02d4d0aSAndreas Gruenbacher ok &= !drbd_send_sizes(mdev, 0, 0); 7722ae5f95bSAndreas Gruenbacher ok &= !drbd_send_uuids(mdev); 773927036f9SAndreas Gruenbacher ok &= !drbd_send_state(mdev); 774907599e0SPhilipp Reisner clear_bit(USE_DEGR_WFC_T, &mdev->flags); 775907599e0SPhilipp Reisner clear_bit(RESIZE_PENDING, &mdev->flags); 776907599e0SPhilipp Reisner 7778410da8fSPhilipp Reisner 778907599e0SPhilipp Reisner return !ok; 779907599e0SPhilipp Reisner } 780907599e0SPhilipp Reisner 781b411b363SPhilipp Reisner /* 782b411b363SPhilipp Reisner * return values: 783b411b363SPhilipp Reisner * 1 yes, we have a valid connection 784b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 785b411b363SPhilipp Reisner * -1 peer talks different language, 786b411b363SPhilipp Reisner * no point in trying again, please go standalone. 787b411b363SPhilipp Reisner * -2 We do not have a network config... 788b411b363SPhilipp Reisner */ 789907599e0SPhilipp Reisner static int drbd_connect(struct drbd_tconn *tconn) 790b411b363SPhilipp Reisner { 791b411b363SPhilipp Reisner struct socket *s, *sock, *msock; 792b411b363SPhilipp Reisner int try, h, ok; 793b411b363SPhilipp Reisner 794bbeb641cSPhilipp Reisner if (conn_request_state(tconn, NS(conn, C_WF_CONNECTION), CS_VERBOSE) < SS_SUCCESS) 795b411b363SPhilipp Reisner return -2; 796b411b363SPhilipp Reisner 797907599e0SPhilipp Reisner clear_bit(DISCARD_CONCURRENT, &tconn->flags); 798907599e0SPhilipp Reisner tconn->agreed_pro_version = 99; 799fd340c12SPhilipp Reisner /* agreed_pro_version must be smaller than 100 so we send the old 800fd340c12SPhilipp Reisner header (h80) in the first packet and in the handshake packet. */ 801b411b363SPhilipp Reisner 802b411b363SPhilipp Reisner sock = NULL; 803b411b363SPhilipp Reisner msock = NULL; 804b411b363SPhilipp Reisner 805b411b363SPhilipp Reisner do { 806b411b363SPhilipp Reisner for (try = 0;;) { 807b411b363SPhilipp Reisner /* 3 tries, this should take less than a second! */ 808907599e0SPhilipp Reisner s = drbd_try_connect(tconn); 809b411b363SPhilipp Reisner if (s || ++try >= 3) 810b411b363SPhilipp Reisner break; 811b411b363SPhilipp Reisner /* give the other side time to call bind() & listen() */ 81220ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ / 10); 813b411b363SPhilipp Reisner } 814b411b363SPhilipp Reisner 815b411b363SPhilipp Reisner if (s) { 816b411b363SPhilipp Reisner if (!sock) { 817907599e0SPhilipp Reisner drbd_send_fp(tconn, s, P_HAND_SHAKE_S); 818b411b363SPhilipp Reisner sock = s; 819b411b363SPhilipp Reisner s = NULL; 820b411b363SPhilipp Reisner } else if (!msock) { 821907599e0SPhilipp Reisner drbd_send_fp(tconn, s, P_HAND_SHAKE_M); 822b411b363SPhilipp Reisner msock = s; 823b411b363SPhilipp Reisner s = NULL; 824b411b363SPhilipp Reisner } else { 825907599e0SPhilipp Reisner conn_err(tconn, "Logic error in drbd_connect()\n"); 826b411b363SPhilipp Reisner goto out_release_sockets; 827b411b363SPhilipp Reisner } 828b411b363SPhilipp Reisner } 829b411b363SPhilipp Reisner 830b411b363SPhilipp Reisner if (sock && msock) { 831907599e0SPhilipp Reisner schedule_timeout_interruptible(tconn->net_conf->ping_timeo*HZ/10); 832dbd9eea0SPhilipp Reisner ok = drbd_socket_okay(&sock); 833dbd9eea0SPhilipp Reisner ok = drbd_socket_okay(&msock) && ok; 834b411b363SPhilipp Reisner if (ok) 835b411b363SPhilipp Reisner break; 836b411b363SPhilipp Reisner } 837b411b363SPhilipp Reisner 838b411b363SPhilipp Reisner retry: 839907599e0SPhilipp Reisner s = drbd_wait_for_connect(tconn); 840b411b363SPhilipp Reisner if (s) { 841907599e0SPhilipp Reisner try = drbd_recv_fp(tconn, s); 842dbd9eea0SPhilipp Reisner drbd_socket_okay(&sock); 843dbd9eea0SPhilipp Reisner drbd_socket_okay(&msock); 844b411b363SPhilipp Reisner switch (try) { 845b411b363SPhilipp Reisner case P_HAND_SHAKE_S: 846b411b363SPhilipp Reisner if (sock) { 847907599e0SPhilipp Reisner conn_warn(tconn, "initial packet S crossed\n"); 848b411b363SPhilipp Reisner sock_release(sock); 849b411b363SPhilipp Reisner } 850b411b363SPhilipp Reisner sock = s; 851b411b363SPhilipp Reisner break; 852b411b363SPhilipp Reisner case P_HAND_SHAKE_M: 853b411b363SPhilipp Reisner if (msock) { 854907599e0SPhilipp Reisner conn_warn(tconn, "initial packet M crossed\n"); 855b411b363SPhilipp Reisner sock_release(msock); 856b411b363SPhilipp Reisner } 857b411b363SPhilipp Reisner msock = s; 858907599e0SPhilipp Reisner set_bit(DISCARD_CONCURRENT, &tconn->flags); 859b411b363SPhilipp Reisner break; 860b411b363SPhilipp Reisner default: 861907599e0SPhilipp Reisner conn_warn(tconn, "Error receiving initial packet\n"); 862b411b363SPhilipp Reisner sock_release(s); 863b411b363SPhilipp Reisner if (random32() & 1) 864b411b363SPhilipp Reisner goto retry; 865b411b363SPhilipp Reisner } 866b411b363SPhilipp Reisner } 867b411b363SPhilipp Reisner 868bbeb641cSPhilipp Reisner if (tconn->cstate <= C_DISCONNECTING) 869b411b363SPhilipp Reisner goto out_release_sockets; 870b411b363SPhilipp Reisner if (signal_pending(current)) { 871b411b363SPhilipp Reisner flush_signals(current); 872b411b363SPhilipp Reisner smp_rmb(); 873907599e0SPhilipp Reisner if (get_t_state(&tconn->receiver) == EXITING) 874b411b363SPhilipp Reisner goto out_release_sockets; 875b411b363SPhilipp Reisner } 876b411b363SPhilipp Reisner 877b411b363SPhilipp Reisner if (sock && msock) { 878dbd9eea0SPhilipp Reisner ok = drbd_socket_okay(&sock); 879dbd9eea0SPhilipp Reisner ok = drbd_socket_okay(&msock) && ok; 880b411b363SPhilipp Reisner if (ok) 881b411b363SPhilipp Reisner break; 882b411b363SPhilipp Reisner } 883b411b363SPhilipp Reisner } while (1); 884b411b363SPhilipp Reisner 885b411b363SPhilipp Reisner msock->sk->sk_reuse = 1; /* SO_REUSEADDR */ 886b411b363SPhilipp Reisner sock->sk->sk_reuse = 1; /* SO_REUSEADDR */ 887b411b363SPhilipp Reisner 888b411b363SPhilipp Reisner sock->sk->sk_allocation = GFP_NOIO; 889b411b363SPhilipp Reisner msock->sk->sk_allocation = GFP_NOIO; 890b411b363SPhilipp Reisner 891b411b363SPhilipp Reisner sock->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; 892b411b363SPhilipp Reisner msock->sk->sk_priority = TC_PRIO_INTERACTIVE; 893b411b363SPhilipp Reisner 894b411b363SPhilipp Reisner /* NOT YET ... 895907599e0SPhilipp Reisner * sock->sk->sk_sndtimeo = tconn->net_conf->timeout*HZ/10; 896b411b363SPhilipp Reisner * sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 897b411b363SPhilipp Reisner * first set it to the P_HAND_SHAKE timeout, 898b411b363SPhilipp Reisner * which we set to 4x the configured ping_timeout. */ 899b411b363SPhilipp Reisner sock->sk->sk_sndtimeo = 900907599e0SPhilipp Reisner sock->sk->sk_rcvtimeo = tconn->net_conf->ping_timeo*4*HZ/10; 901b411b363SPhilipp Reisner 902907599e0SPhilipp Reisner msock->sk->sk_sndtimeo = tconn->net_conf->timeout*HZ/10; 903907599e0SPhilipp Reisner msock->sk->sk_rcvtimeo = tconn->net_conf->ping_int*HZ; 904b411b363SPhilipp Reisner 905b411b363SPhilipp Reisner /* we don't want delays. 90625985edcSLucas De Marchi * we use TCP_CORK where appropriate, though */ 907b411b363SPhilipp Reisner drbd_tcp_nodelay(sock); 908b411b363SPhilipp Reisner drbd_tcp_nodelay(msock); 909b411b363SPhilipp Reisner 910907599e0SPhilipp Reisner tconn->data.socket = sock; 911907599e0SPhilipp Reisner tconn->meta.socket = msock; 912907599e0SPhilipp Reisner tconn->last_received = jiffies; 913b411b363SPhilipp Reisner 914907599e0SPhilipp Reisner h = drbd_do_handshake(tconn); 915b411b363SPhilipp Reisner if (h <= 0) 916b411b363SPhilipp Reisner return h; 917b411b363SPhilipp Reisner 918907599e0SPhilipp Reisner if (tconn->cram_hmac_tfm) { 919b411b363SPhilipp Reisner /* drbd_request_state(mdev, NS(conn, WFAuth)); */ 920907599e0SPhilipp Reisner switch (drbd_do_auth(tconn)) { 921b10d96cbSJohannes Thoma case -1: 922907599e0SPhilipp Reisner conn_err(tconn, "Authentication of peer failed\n"); 923b411b363SPhilipp Reisner return -1; 924b10d96cbSJohannes Thoma case 0: 925907599e0SPhilipp Reisner conn_err(tconn, "Authentication of peer failed, trying again.\n"); 926b10d96cbSJohannes Thoma return 0; 927b411b363SPhilipp Reisner } 928b411b363SPhilipp Reisner } 929b411b363SPhilipp Reisner 930bbeb641cSPhilipp Reisner if (conn_request_state(tconn, NS(conn, C_WF_REPORT_PARAMS), CS_VERBOSE) < SS_SUCCESS) 931b411b363SPhilipp Reisner return 0; 932b411b363SPhilipp Reisner 933907599e0SPhilipp Reisner sock->sk->sk_sndtimeo = tconn->net_conf->timeout*HZ/10; 934b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 935b411b363SPhilipp Reisner 936907599e0SPhilipp Reisner drbd_thread_start(&tconn->asender); 937b411b363SPhilipp Reisner 938387eb308SAndreas Gruenbacher if (drbd_send_protocol(tconn) == -EOPNOTSUPP) 9397e2455c1SPhilipp Reisner return -1; 940b411b363SPhilipp Reisner 941907599e0SPhilipp Reisner return !idr_for_each(&tconn->volumes, drbd_connected, tconn); 942b411b363SPhilipp Reisner 943b411b363SPhilipp Reisner out_release_sockets: 944b411b363SPhilipp Reisner if (sock) 945b411b363SPhilipp Reisner sock_release(sock); 946b411b363SPhilipp Reisner if (msock) 947b411b363SPhilipp Reisner sock_release(msock); 948b411b363SPhilipp Reisner return -1; 949b411b363SPhilipp Reisner } 950b411b363SPhilipp Reisner 9518172f3e9SAndreas Gruenbacher static int decode_header(struct drbd_tconn *tconn, struct p_header *h, struct packet_info *pi) 952b411b363SPhilipp Reisner { 953fd340c12SPhilipp Reisner if (h->h80.magic == cpu_to_be32(DRBD_MAGIC)) { 95477351055SPhilipp Reisner pi->cmd = be16_to_cpu(h->h80.command); 95577351055SPhilipp Reisner pi->size = be16_to_cpu(h->h80.length); 956eefc2f7dSPhilipp Reisner pi->vnr = 0; 957ca9bc12bSAndreas Gruenbacher } else if (h->h95.magic == cpu_to_be16(DRBD_MAGIC_BIG)) { 95877351055SPhilipp Reisner pi->cmd = be16_to_cpu(h->h95.command); 95977351055SPhilipp Reisner pi->size = be32_to_cpu(h->h95.length) & 0x00ffffff; 96077351055SPhilipp Reisner pi->vnr = 0; 96102918be2SPhilipp Reisner } else { 962ce243853SPhilipp Reisner conn_err(tconn, "magic?? on data m: 0x%08x c: %d l: %d\n", 963004352faSLars Ellenberg be32_to_cpu(h->h80.magic), 964004352faSLars Ellenberg be16_to_cpu(h->h80.command), 965004352faSLars Ellenberg be16_to_cpu(h->h80.length)); 9668172f3e9SAndreas Gruenbacher return -EINVAL; 967b411b363SPhilipp Reisner } 9688172f3e9SAndreas Gruenbacher return 0; 969257d0af6SPhilipp Reisner } 970257d0af6SPhilipp Reisner 9719ba7aa00SPhilipp Reisner static int drbd_recv_header(struct drbd_tconn *tconn, struct packet_info *pi) 972257d0af6SPhilipp Reisner { 9739ba7aa00SPhilipp Reisner struct p_header *h = &tconn->data.rbuf.header; 97469bc7bc3SAndreas Gruenbacher int err; 975257d0af6SPhilipp Reisner 97669bc7bc3SAndreas Gruenbacher err = drbd_recv(tconn, h, sizeof(*h)); 97769bc7bc3SAndreas Gruenbacher if (unlikely(err != sizeof(*h))) { 978257d0af6SPhilipp Reisner if (!signal_pending(current)) 97969bc7bc3SAndreas Gruenbacher conn_warn(tconn, "short read expecting header on sock: r=%d\n", err); 98069bc7bc3SAndreas Gruenbacher if (err >= 0) 98169bc7bc3SAndreas Gruenbacher err = -EIO; 98269bc7bc3SAndreas Gruenbacher return err; 983257d0af6SPhilipp Reisner } 984257d0af6SPhilipp Reisner 98569bc7bc3SAndreas Gruenbacher err = decode_header(tconn, h, pi); 9869ba7aa00SPhilipp Reisner tconn->last_received = jiffies; 987b411b363SPhilipp Reisner 98869bc7bc3SAndreas Gruenbacher return err; 989b411b363SPhilipp Reisner } 990b411b363SPhilipp Reisner 9912451fc3bSPhilipp Reisner static void drbd_flush(struct drbd_conf *mdev) 992b411b363SPhilipp Reisner { 993b411b363SPhilipp Reisner int rv; 994b411b363SPhilipp Reisner 995b411b363SPhilipp Reisner if (mdev->write_ordering >= WO_bdev_flush && get_ldev(mdev)) { 996fbd9b09aSDmitry Monakhov rv = blkdev_issue_flush(mdev->ldev->backing_bdev, GFP_KERNEL, 997dd3932edSChristoph Hellwig NULL); 998b411b363SPhilipp Reisner if (rv) { 999b411b363SPhilipp Reisner dev_err(DEV, "local disk flush failed with status %d\n", rv); 1000b411b363SPhilipp Reisner /* would rather check on EOPNOTSUPP, but that is not reliable. 1001b411b363SPhilipp Reisner * don't try again for ANY return value != 0 1002b411b363SPhilipp Reisner * if (rv == -EOPNOTSUPP) */ 1003b411b363SPhilipp Reisner drbd_bump_write_ordering(mdev, WO_drain_io); 1004b411b363SPhilipp Reisner } 1005b411b363SPhilipp Reisner put_ldev(mdev); 1006b411b363SPhilipp Reisner } 1007b411b363SPhilipp Reisner } 1008b411b363SPhilipp Reisner 1009b411b363SPhilipp Reisner /** 1010b411b363SPhilipp Reisner * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. 1011b411b363SPhilipp Reisner * @mdev: DRBD device. 1012b411b363SPhilipp Reisner * @epoch: Epoch object. 1013b411b363SPhilipp Reisner * @ev: Epoch event. 1014b411b363SPhilipp Reisner */ 1015b411b363SPhilipp Reisner static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev, 1016b411b363SPhilipp Reisner struct drbd_epoch *epoch, 1017b411b363SPhilipp Reisner enum epoch_event ev) 1018b411b363SPhilipp Reisner { 10192451fc3bSPhilipp Reisner int epoch_size; 1020b411b363SPhilipp Reisner struct drbd_epoch *next_epoch; 1021b411b363SPhilipp Reisner enum finish_epoch rv = FE_STILL_LIVE; 1022b411b363SPhilipp Reisner 1023b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1024b411b363SPhilipp Reisner do { 1025b411b363SPhilipp Reisner next_epoch = NULL; 1026b411b363SPhilipp Reisner 1027b411b363SPhilipp Reisner epoch_size = atomic_read(&epoch->epoch_size); 1028b411b363SPhilipp Reisner 1029b411b363SPhilipp Reisner switch (ev & ~EV_CLEANUP) { 1030b411b363SPhilipp Reisner case EV_PUT: 1031b411b363SPhilipp Reisner atomic_dec(&epoch->active); 1032b411b363SPhilipp Reisner break; 1033b411b363SPhilipp Reisner case EV_GOT_BARRIER_NR: 1034b411b363SPhilipp Reisner set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); 1035b411b363SPhilipp Reisner break; 1036b411b363SPhilipp Reisner case EV_BECAME_LAST: 1037b411b363SPhilipp Reisner /* nothing to do*/ 1038b411b363SPhilipp Reisner break; 1039b411b363SPhilipp Reisner } 1040b411b363SPhilipp Reisner 1041b411b363SPhilipp Reisner if (epoch_size != 0 && 1042b411b363SPhilipp Reisner atomic_read(&epoch->active) == 0 && 10432451fc3bSPhilipp Reisner test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) { 1044b411b363SPhilipp Reisner if (!(ev & EV_CLEANUP)) { 1045b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1046b411b363SPhilipp Reisner drbd_send_b_ack(mdev, epoch->barrier_nr, epoch_size); 1047b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1048b411b363SPhilipp Reisner } 1049b411b363SPhilipp Reisner dec_unacked(mdev); 1050b411b363SPhilipp Reisner 1051b411b363SPhilipp Reisner if (mdev->current_epoch != epoch) { 1052b411b363SPhilipp Reisner next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); 1053b411b363SPhilipp Reisner list_del(&epoch->list); 1054b411b363SPhilipp Reisner ev = EV_BECAME_LAST | (ev & EV_CLEANUP); 1055b411b363SPhilipp Reisner mdev->epochs--; 1056b411b363SPhilipp Reisner kfree(epoch); 1057b411b363SPhilipp Reisner 1058b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1059b411b363SPhilipp Reisner rv = FE_DESTROYED; 1060b411b363SPhilipp Reisner } else { 1061b411b363SPhilipp Reisner epoch->flags = 0; 1062b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1063698f9315SUwe Kleine-König /* atomic_set(&epoch->active, 0); is already zero */ 1064b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1065b411b363SPhilipp Reisner rv = FE_RECYCLED; 10662451fc3bSPhilipp Reisner wake_up(&mdev->ee_wait); 1067b411b363SPhilipp Reisner } 1068b411b363SPhilipp Reisner } 1069b411b363SPhilipp Reisner 1070b411b363SPhilipp Reisner if (!next_epoch) 1071b411b363SPhilipp Reisner break; 1072b411b363SPhilipp Reisner 1073b411b363SPhilipp Reisner epoch = next_epoch; 1074b411b363SPhilipp Reisner } while (1); 1075b411b363SPhilipp Reisner 1076b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1077b411b363SPhilipp Reisner 1078b411b363SPhilipp Reisner return rv; 1079b411b363SPhilipp Reisner } 1080b411b363SPhilipp Reisner 1081b411b363SPhilipp Reisner /** 1082b411b363SPhilipp Reisner * drbd_bump_write_ordering() - Fall back to an other write ordering method 1083b411b363SPhilipp Reisner * @mdev: DRBD device. 1084b411b363SPhilipp Reisner * @wo: Write ordering method to try. 1085b411b363SPhilipp Reisner */ 1086b411b363SPhilipp Reisner void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo) __must_hold(local) 1087b411b363SPhilipp Reisner { 1088b411b363SPhilipp Reisner enum write_ordering_e pwo; 1089b411b363SPhilipp Reisner static char *write_ordering_str[] = { 1090b411b363SPhilipp Reisner [WO_none] = "none", 1091b411b363SPhilipp Reisner [WO_drain_io] = "drain", 1092b411b363SPhilipp Reisner [WO_bdev_flush] = "flush", 1093b411b363SPhilipp Reisner }; 1094b411b363SPhilipp Reisner 1095b411b363SPhilipp Reisner pwo = mdev->write_ordering; 1096b411b363SPhilipp Reisner wo = min(pwo, wo); 1097b411b363SPhilipp Reisner if (wo == WO_bdev_flush && mdev->ldev->dc.no_disk_flush) 1098b411b363SPhilipp Reisner wo = WO_drain_io; 1099b411b363SPhilipp Reisner if (wo == WO_drain_io && mdev->ldev->dc.no_disk_drain) 1100b411b363SPhilipp Reisner wo = WO_none; 1101b411b363SPhilipp Reisner mdev->write_ordering = wo; 11022451fc3bSPhilipp Reisner if (pwo != mdev->write_ordering || wo == WO_bdev_flush) 1103b411b363SPhilipp Reisner dev_info(DEV, "Method to ensure write ordering: %s\n", write_ordering_str[mdev->write_ordering]); 1104b411b363SPhilipp Reisner } 1105b411b363SPhilipp Reisner 1106b411b363SPhilipp Reisner /** 1107fbe29decSAndreas Gruenbacher * drbd_submit_peer_request() 110845bb912bSLars Ellenberg * @mdev: DRBD device. 1109db830c46SAndreas Gruenbacher * @peer_req: peer request 111045bb912bSLars Ellenberg * @rw: flag field, see bio->bi_rw 111110f6d992SLars Ellenberg * 111210f6d992SLars Ellenberg * May spread the pages to multiple bios, 111310f6d992SLars Ellenberg * depending on bio_add_page restrictions. 111410f6d992SLars Ellenberg * 111510f6d992SLars Ellenberg * Returns 0 if all bios have been submitted, 111610f6d992SLars Ellenberg * -ENOMEM if we could not allocate enough bios, 111710f6d992SLars Ellenberg * -ENOSPC (any better suggestion?) if we have not been able to bio_add_page a 111810f6d992SLars Ellenberg * single page to an empty bio (which should never happen and likely indicates 111910f6d992SLars Ellenberg * that the lower level IO stack is in some way broken). This has been observed 112010f6d992SLars Ellenberg * on certain Xen deployments. 112145bb912bSLars Ellenberg */ 112245bb912bSLars Ellenberg /* TODO allocate from our own bio_set. */ 1123fbe29decSAndreas Gruenbacher int drbd_submit_peer_request(struct drbd_conf *mdev, 1124fbe29decSAndreas Gruenbacher struct drbd_peer_request *peer_req, 112545bb912bSLars Ellenberg const unsigned rw, const int fault_type) 112645bb912bSLars Ellenberg { 112745bb912bSLars Ellenberg struct bio *bios = NULL; 112845bb912bSLars Ellenberg struct bio *bio; 1129db830c46SAndreas Gruenbacher struct page *page = peer_req->pages; 1130db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 1131db830c46SAndreas Gruenbacher unsigned ds = peer_req->i.size; 113245bb912bSLars Ellenberg unsigned n_bios = 0; 113345bb912bSLars Ellenberg unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT; 113410f6d992SLars Ellenberg int err = -ENOMEM; 113545bb912bSLars Ellenberg 113645bb912bSLars Ellenberg /* In most cases, we will only need one bio. But in case the lower 113745bb912bSLars Ellenberg * level restrictions happen to be different at this offset on this 113845bb912bSLars Ellenberg * side than those of the sending peer, we may need to submit the 1139da4a75d2SLars Ellenberg * request in more than one bio. 1140da4a75d2SLars Ellenberg * 1141da4a75d2SLars Ellenberg * Plain bio_alloc is good enough here, this is no DRBD internally 1142da4a75d2SLars Ellenberg * generated bio, but a bio allocated on behalf of the peer. 1143da4a75d2SLars Ellenberg */ 114445bb912bSLars Ellenberg next_bio: 114545bb912bSLars Ellenberg bio = bio_alloc(GFP_NOIO, nr_pages); 114645bb912bSLars Ellenberg if (!bio) { 114745bb912bSLars Ellenberg dev_err(DEV, "submit_ee: Allocation of a bio failed\n"); 114845bb912bSLars Ellenberg goto fail; 114945bb912bSLars Ellenberg } 1150db830c46SAndreas Gruenbacher /* > peer_req->i.sector, unless this is the first bio */ 115145bb912bSLars Ellenberg bio->bi_sector = sector; 115245bb912bSLars Ellenberg bio->bi_bdev = mdev->ldev->backing_bdev; 115345bb912bSLars Ellenberg bio->bi_rw = rw; 1154db830c46SAndreas Gruenbacher bio->bi_private = peer_req; 1155fcefa62eSAndreas Gruenbacher bio->bi_end_io = drbd_peer_request_endio; 115645bb912bSLars Ellenberg 115745bb912bSLars Ellenberg bio->bi_next = bios; 115845bb912bSLars Ellenberg bios = bio; 115945bb912bSLars Ellenberg ++n_bios; 116045bb912bSLars Ellenberg 116145bb912bSLars Ellenberg page_chain_for_each(page) { 116245bb912bSLars Ellenberg unsigned len = min_t(unsigned, ds, PAGE_SIZE); 116345bb912bSLars Ellenberg if (!bio_add_page(bio, page, len, 0)) { 116410f6d992SLars Ellenberg /* A single page must always be possible! 116510f6d992SLars Ellenberg * But in case it fails anyways, 116610f6d992SLars Ellenberg * we deal with it, and complain (below). */ 116710f6d992SLars Ellenberg if (bio->bi_vcnt == 0) { 116810f6d992SLars Ellenberg dev_err(DEV, 116910f6d992SLars Ellenberg "bio_add_page failed for len=%u, " 117010f6d992SLars Ellenberg "bi_vcnt=0 (bi_sector=%llu)\n", 117110f6d992SLars Ellenberg len, (unsigned long long)bio->bi_sector); 117210f6d992SLars Ellenberg err = -ENOSPC; 117310f6d992SLars Ellenberg goto fail; 117410f6d992SLars Ellenberg } 117545bb912bSLars Ellenberg goto next_bio; 117645bb912bSLars Ellenberg } 117745bb912bSLars Ellenberg ds -= len; 117845bb912bSLars Ellenberg sector += len >> 9; 117945bb912bSLars Ellenberg --nr_pages; 118045bb912bSLars Ellenberg } 118145bb912bSLars Ellenberg D_ASSERT(page == NULL); 118245bb912bSLars Ellenberg D_ASSERT(ds == 0); 118345bb912bSLars Ellenberg 1184db830c46SAndreas Gruenbacher atomic_set(&peer_req->pending_bios, n_bios); 118545bb912bSLars Ellenberg do { 118645bb912bSLars Ellenberg bio = bios; 118745bb912bSLars Ellenberg bios = bios->bi_next; 118845bb912bSLars Ellenberg bio->bi_next = NULL; 118945bb912bSLars Ellenberg 119045bb912bSLars Ellenberg drbd_generic_make_request(mdev, fault_type, bio); 119145bb912bSLars Ellenberg } while (bios); 119245bb912bSLars Ellenberg return 0; 119345bb912bSLars Ellenberg 119445bb912bSLars Ellenberg fail: 119545bb912bSLars Ellenberg while (bios) { 119645bb912bSLars Ellenberg bio = bios; 119745bb912bSLars Ellenberg bios = bios->bi_next; 119845bb912bSLars Ellenberg bio_put(bio); 119945bb912bSLars Ellenberg } 120010f6d992SLars Ellenberg return err; 120145bb912bSLars Ellenberg } 120245bb912bSLars Ellenberg 120353840641SAndreas Gruenbacher static void drbd_remove_epoch_entry_interval(struct drbd_conf *mdev, 1204db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req) 120553840641SAndreas Gruenbacher { 1206db830c46SAndreas Gruenbacher struct drbd_interval *i = &peer_req->i; 120753840641SAndreas Gruenbacher 120853840641SAndreas Gruenbacher drbd_remove_interval(&mdev->write_requests, i); 120953840641SAndreas Gruenbacher drbd_clear_interval(i); 121053840641SAndreas Gruenbacher 12116c852becSAndreas Gruenbacher /* Wake up any processes waiting for this peer request to complete. */ 121253840641SAndreas Gruenbacher if (i->waiting) 121353840641SAndreas Gruenbacher wake_up(&mdev->misc_wait); 121453840641SAndreas Gruenbacher } 121553840641SAndreas Gruenbacher 1216d8763023SAndreas Gruenbacher static int receive_Barrier(struct drbd_conf *mdev, enum drbd_packet cmd, 1217d8763023SAndreas Gruenbacher unsigned int data_size) 1218b411b363SPhilipp Reisner { 12192451fc3bSPhilipp Reisner int rv; 1220e42325a5SPhilipp Reisner struct p_barrier *p = &mdev->tconn->data.rbuf.barrier; 1221b411b363SPhilipp Reisner struct drbd_epoch *epoch; 1222b411b363SPhilipp Reisner 1223b411b363SPhilipp Reisner inc_unacked(mdev); 1224b411b363SPhilipp Reisner 1225b411b363SPhilipp Reisner mdev->current_epoch->barrier_nr = p->barrier; 1226b411b363SPhilipp Reisner rv = drbd_may_finish_epoch(mdev, mdev->current_epoch, EV_GOT_BARRIER_NR); 1227b411b363SPhilipp Reisner 1228b411b363SPhilipp Reisner /* P_BARRIER_ACK may imply that the corresponding extent is dropped from 1229b411b363SPhilipp Reisner * the activity log, which means it would not be resynced in case the 1230b411b363SPhilipp Reisner * R_PRIMARY crashes now. 1231b411b363SPhilipp Reisner * Therefore we must send the barrier_ack after the barrier request was 1232b411b363SPhilipp Reisner * completed. */ 1233b411b363SPhilipp Reisner switch (mdev->write_ordering) { 1234b411b363SPhilipp Reisner case WO_none: 1235b411b363SPhilipp Reisner if (rv == FE_RECYCLED) 123681e84650SAndreas Gruenbacher return true; 1237b411b363SPhilipp Reisner 1238b411b363SPhilipp Reisner /* receiver context, in the writeout path of the other node. 1239b411b363SPhilipp Reisner * avoid potential distributed deadlock */ 1240b411b363SPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 12412451fc3bSPhilipp Reisner if (epoch) 12422451fc3bSPhilipp Reisner break; 12432451fc3bSPhilipp Reisner else 1244b411b363SPhilipp Reisner dev_warn(DEV, "Allocation of an epoch failed, slowing down\n"); 12452451fc3bSPhilipp Reisner /* Fall through */ 12462451fc3bSPhilipp Reisner 12472451fc3bSPhilipp Reisner case WO_bdev_flush: 12482451fc3bSPhilipp Reisner case WO_drain_io: 1249b411b363SPhilipp Reisner drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 12502451fc3bSPhilipp Reisner drbd_flush(mdev); 12512451fc3bSPhilipp Reisner 12522451fc3bSPhilipp Reisner if (atomic_read(&mdev->current_epoch->epoch_size)) { 12532451fc3bSPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 12542451fc3bSPhilipp Reisner if (epoch) 12552451fc3bSPhilipp Reisner break; 1256b411b363SPhilipp Reisner } 1257b411b363SPhilipp Reisner 12582451fc3bSPhilipp Reisner epoch = mdev->current_epoch; 12592451fc3bSPhilipp Reisner wait_event(mdev->ee_wait, atomic_read(&epoch->epoch_size) == 0); 12602451fc3bSPhilipp Reisner 12612451fc3bSPhilipp Reisner D_ASSERT(atomic_read(&epoch->active) == 0); 12622451fc3bSPhilipp Reisner D_ASSERT(epoch->flags == 0); 1263b411b363SPhilipp Reisner 126481e84650SAndreas Gruenbacher return true; 12652451fc3bSPhilipp Reisner default: 12662451fc3bSPhilipp Reisner dev_err(DEV, "Strangeness in mdev->write_ordering %d\n", mdev->write_ordering); 126781e84650SAndreas Gruenbacher return false; 1268b411b363SPhilipp Reisner } 1269b411b363SPhilipp Reisner 1270b411b363SPhilipp Reisner epoch->flags = 0; 1271b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1272b411b363SPhilipp Reisner atomic_set(&epoch->active, 0); 1273b411b363SPhilipp Reisner 1274b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1275b411b363SPhilipp Reisner if (atomic_read(&mdev->current_epoch->epoch_size)) { 1276b411b363SPhilipp Reisner list_add(&epoch->list, &mdev->current_epoch->list); 1277b411b363SPhilipp Reisner mdev->current_epoch = epoch; 1278b411b363SPhilipp Reisner mdev->epochs++; 1279b411b363SPhilipp Reisner } else { 1280b411b363SPhilipp Reisner /* The current_epoch got recycled while we allocated this one... */ 1281b411b363SPhilipp Reisner kfree(epoch); 1282b411b363SPhilipp Reisner } 1283b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1284b411b363SPhilipp Reisner 128581e84650SAndreas Gruenbacher return true; 1286b411b363SPhilipp Reisner } 1287b411b363SPhilipp Reisner 1288b411b363SPhilipp Reisner /* used from receive_RSDataReply (recv_resync_read) 1289b411b363SPhilipp Reisner * and from receive_Data */ 1290f6ffca9fSAndreas Gruenbacher static struct drbd_peer_request * 1291f6ffca9fSAndreas Gruenbacher read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, 1292f6ffca9fSAndreas Gruenbacher int data_size) __must_hold(local) 1293b411b363SPhilipp Reisner { 12946666032aSLars Ellenberg const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 1295db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 1296b411b363SPhilipp Reisner struct page *page; 129745bb912bSLars Ellenberg int dgs, ds, rr; 1298a0638456SPhilipp Reisner void *dig_in = mdev->tconn->int_dig_in; 1299a0638456SPhilipp Reisner void *dig_vv = mdev->tconn->int_dig_vv; 13006b4388acSPhilipp Reisner unsigned long *data; 1301b411b363SPhilipp Reisner 1302a0638456SPhilipp Reisner dgs = (mdev->tconn->agreed_pro_version >= 87 && mdev->tconn->integrity_r_tfm) ? 1303a0638456SPhilipp Reisner crypto_hash_digestsize(mdev->tconn->integrity_r_tfm) : 0; 1304b411b363SPhilipp Reisner 1305b411b363SPhilipp Reisner if (dgs) { 1306de0ff338SPhilipp Reisner rr = drbd_recv(mdev->tconn, dig_in, dgs); 1307b411b363SPhilipp Reisner if (rr != dgs) { 13080ddc5549SLars Ellenberg if (!signal_pending(current)) 13090ddc5549SLars Ellenberg dev_warn(DEV, 13100ddc5549SLars Ellenberg "short read receiving data digest: read %d expected %d\n", 1311b411b363SPhilipp Reisner rr, dgs); 1312b411b363SPhilipp Reisner return NULL; 1313b411b363SPhilipp Reisner } 1314b411b363SPhilipp Reisner } 1315b411b363SPhilipp Reisner 1316b411b363SPhilipp Reisner data_size -= dgs; 1317b411b363SPhilipp Reisner 1318841ce241SAndreas Gruenbacher if (!expect(data_size != 0)) 1319841ce241SAndreas Gruenbacher return NULL; 1320841ce241SAndreas Gruenbacher if (!expect(IS_ALIGNED(data_size, 512))) 1321841ce241SAndreas Gruenbacher return NULL; 1322841ce241SAndreas Gruenbacher if (!expect(data_size <= DRBD_MAX_BIO_SIZE)) 1323841ce241SAndreas Gruenbacher return NULL; 1324b411b363SPhilipp Reisner 13256666032aSLars Ellenberg /* even though we trust out peer, 13266666032aSLars Ellenberg * we sometimes have to double check. */ 13276666032aSLars Ellenberg if (sector + (data_size>>9) > capacity) { 1328fdda6544SLars Ellenberg dev_err(DEV, "request from peer beyond end of local disk: " 1329fdda6544SLars Ellenberg "capacity: %llus < sector: %llus + size: %u\n", 13306666032aSLars Ellenberg (unsigned long long)capacity, 13316666032aSLars Ellenberg (unsigned long long)sector, data_size); 13326666032aSLars Ellenberg return NULL; 13336666032aSLars Ellenberg } 13346666032aSLars Ellenberg 1335b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 1336b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 1337b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 1338db830c46SAndreas Gruenbacher peer_req = drbd_alloc_ee(mdev, id, sector, data_size, GFP_NOIO); 1339db830c46SAndreas Gruenbacher if (!peer_req) 1340b411b363SPhilipp Reisner return NULL; 134145bb912bSLars Ellenberg 1342b411b363SPhilipp Reisner ds = data_size; 1343db830c46SAndreas Gruenbacher page = peer_req->pages; 134445bb912bSLars Ellenberg page_chain_for_each(page) { 134545bb912bSLars Ellenberg unsigned len = min_t(int, ds, PAGE_SIZE); 13466b4388acSPhilipp Reisner data = kmap(page); 1347de0ff338SPhilipp Reisner rr = drbd_recv(mdev->tconn, data, len); 13480cf9d27eSAndreas Gruenbacher if (drbd_insert_fault(mdev, DRBD_FAULT_RECEIVE)) { 13496b4388acSPhilipp Reisner dev_err(DEV, "Fault injection: Corrupting data on receive\n"); 13506b4388acSPhilipp Reisner data[0] = data[0] ^ (unsigned long)-1; 13516b4388acSPhilipp Reisner } 1352b411b363SPhilipp Reisner kunmap(page); 135345bb912bSLars Ellenberg if (rr != len) { 1354db830c46SAndreas Gruenbacher drbd_free_ee(mdev, peer_req); 13550ddc5549SLars Ellenberg if (!signal_pending(current)) 1356b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data: read %d expected %d\n", 135745bb912bSLars Ellenberg rr, len); 1358b411b363SPhilipp Reisner return NULL; 1359b411b363SPhilipp Reisner } 1360b411b363SPhilipp Reisner ds -= rr; 1361b411b363SPhilipp Reisner } 1362b411b363SPhilipp Reisner 1363b411b363SPhilipp Reisner if (dgs) { 1364db830c46SAndreas Gruenbacher drbd_csum_ee(mdev, mdev->tconn->integrity_r_tfm, peer_req, dig_vv); 1365b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1366470be44aSLars Ellenberg dev_err(DEV, "Digest integrity check FAILED: %llus +%u\n", 1367470be44aSLars Ellenberg (unsigned long long)sector, data_size); 1368db830c46SAndreas Gruenbacher drbd_free_ee(mdev, peer_req); 1369b411b363SPhilipp Reisner return NULL; 1370b411b363SPhilipp Reisner } 1371b411b363SPhilipp Reisner } 1372b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1373db830c46SAndreas Gruenbacher return peer_req; 1374b411b363SPhilipp Reisner } 1375b411b363SPhilipp Reisner 1376b411b363SPhilipp Reisner /* drbd_drain_block() just takes a data block 1377b411b363SPhilipp Reisner * out of the socket input buffer, and discards it. 1378b411b363SPhilipp Reisner */ 1379b411b363SPhilipp Reisner static int drbd_drain_block(struct drbd_conf *mdev, int data_size) 1380b411b363SPhilipp Reisner { 1381b411b363SPhilipp Reisner struct page *page; 1382b411b363SPhilipp Reisner int rr, rv = 1; 1383b411b363SPhilipp Reisner void *data; 1384b411b363SPhilipp Reisner 1385c3470cdeSLars Ellenberg if (!data_size) 138681e84650SAndreas Gruenbacher return true; 1387c3470cdeSLars Ellenberg 138845bb912bSLars Ellenberg page = drbd_pp_alloc(mdev, 1, 1); 1389b411b363SPhilipp Reisner 1390b411b363SPhilipp Reisner data = kmap(page); 1391b411b363SPhilipp Reisner while (data_size) { 1392de0ff338SPhilipp Reisner rr = drbd_recv(mdev->tconn, data, min_t(int, data_size, PAGE_SIZE)); 1393b411b363SPhilipp Reisner if (rr != min_t(int, data_size, PAGE_SIZE)) { 1394b411b363SPhilipp Reisner rv = 0; 13950ddc5549SLars Ellenberg if (!signal_pending(current)) 13960ddc5549SLars Ellenberg dev_warn(DEV, 13970ddc5549SLars Ellenberg "short read receiving data: read %d expected %d\n", 1398b411b363SPhilipp Reisner rr, min_t(int, data_size, PAGE_SIZE)); 1399b411b363SPhilipp Reisner break; 1400b411b363SPhilipp Reisner } 1401b411b363SPhilipp Reisner data_size -= rr; 1402b411b363SPhilipp Reisner } 1403b411b363SPhilipp Reisner kunmap(page); 1404435f0740SLars Ellenberg drbd_pp_free(mdev, page, 0); 1405b411b363SPhilipp Reisner return rv; 1406b411b363SPhilipp Reisner } 1407b411b363SPhilipp Reisner 1408b411b363SPhilipp Reisner static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req, 1409b411b363SPhilipp Reisner sector_t sector, int data_size) 1410b411b363SPhilipp Reisner { 1411b411b363SPhilipp Reisner struct bio_vec *bvec; 1412b411b363SPhilipp Reisner struct bio *bio; 1413b411b363SPhilipp Reisner int dgs, rr, i, expect; 1414a0638456SPhilipp Reisner void *dig_in = mdev->tconn->int_dig_in; 1415a0638456SPhilipp Reisner void *dig_vv = mdev->tconn->int_dig_vv; 1416b411b363SPhilipp Reisner 1417a0638456SPhilipp Reisner dgs = (mdev->tconn->agreed_pro_version >= 87 && mdev->tconn->integrity_r_tfm) ? 1418a0638456SPhilipp Reisner crypto_hash_digestsize(mdev->tconn->integrity_r_tfm) : 0; 1419b411b363SPhilipp Reisner 1420b411b363SPhilipp Reisner if (dgs) { 1421de0ff338SPhilipp Reisner rr = drbd_recv(mdev->tconn, dig_in, dgs); 1422b411b363SPhilipp Reisner if (rr != dgs) { 14230ddc5549SLars Ellenberg if (!signal_pending(current)) 14240ddc5549SLars Ellenberg dev_warn(DEV, 14250ddc5549SLars Ellenberg "short read receiving data reply digest: read %d expected %d\n", 1426b411b363SPhilipp Reisner rr, dgs); 1427b411b363SPhilipp Reisner return 0; 1428b411b363SPhilipp Reisner } 1429b411b363SPhilipp Reisner } 1430b411b363SPhilipp Reisner 1431b411b363SPhilipp Reisner data_size -= dgs; 1432b411b363SPhilipp Reisner 1433b411b363SPhilipp Reisner /* optimistically update recv_cnt. if receiving fails below, 1434b411b363SPhilipp Reisner * we disconnect anyways, and counters will be reset. */ 1435b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1436b411b363SPhilipp Reisner 1437b411b363SPhilipp Reisner bio = req->master_bio; 1438b411b363SPhilipp Reisner D_ASSERT(sector == bio->bi_sector); 1439b411b363SPhilipp Reisner 1440b411b363SPhilipp Reisner bio_for_each_segment(bvec, bio, i) { 1441b411b363SPhilipp Reisner expect = min_t(int, data_size, bvec->bv_len); 1442de0ff338SPhilipp Reisner rr = drbd_recv(mdev->tconn, 1443b411b363SPhilipp Reisner kmap(bvec->bv_page)+bvec->bv_offset, 1444b411b363SPhilipp Reisner expect); 1445b411b363SPhilipp Reisner kunmap(bvec->bv_page); 1446b411b363SPhilipp Reisner if (rr != expect) { 14470ddc5549SLars Ellenberg if (!signal_pending(current)) 1448b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data reply: " 1449b411b363SPhilipp Reisner "read %d expected %d\n", 1450b411b363SPhilipp Reisner rr, expect); 1451b411b363SPhilipp Reisner return 0; 1452b411b363SPhilipp Reisner } 1453b411b363SPhilipp Reisner data_size -= rr; 1454b411b363SPhilipp Reisner } 1455b411b363SPhilipp Reisner 1456b411b363SPhilipp Reisner if (dgs) { 1457a0638456SPhilipp Reisner drbd_csum_bio(mdev, mdev->tconn->integrity_r_tfm, bio, dig_vv); 1458b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1459b411b363SPhilipp Reisner dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n"); 1460b411b363SPhilipp Reisner return 0; 1461b411b363SPhilipp Reisner } 1462b411b363SPhilipp Reisner } 1463b411b363SPhilipp Reisner 1464b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 1465b411b363SPhilipp Reisner return 1; 1466b411b363SPhilipp Reisner } 1467b411b363SPhilipp Reisner 1468b411b363SPhilipp Reisner /* e_end_resync_block() is called via 1469b411b363SPhilipp Reisner * drbd_process_done_ee() by asender only */ 147099920dc5SAndreas Gruenbacher static int e_end_resync_block(struct drbd_work *w, int unused) 1471b411b363SPhilipp Reisner { 14728050e6d0SAndreas Gruenbacher struct drbd_peer_request *peer_req = 14738050e6d0SAndreas Gruenbacher container_of(w, struct drbd_peer_request, w); 147400d56944SPhilipp Reisner struct drbd_conf *mdev = w->mdev; 1475db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 147699920dc5SAndreas Gruenbacher int err; 1477b411b363SPhilipp Reisner 1478db830c46SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&peer_req->i)); 1479b411b363SPhilipp Reisner 1480db830c46SAndreas Gruenbacher if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { 1481db830c46SAndreas Gruenbacher drbd_set_in_sync(mdev, sector, peer_req->i.size); 148299920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, P_RS_WRITE_ACK, peer_req); 1483b411b363SPhilipp Reisner } else { 1484b411b363SPhilipp Reisner /* Record failure to sync */ 1485db830c46SAndreas Gruenbacher drbd_rs_failed_io(mdev, sector, peer_req->i.size); 1486b411b363SPhilipp Reisner 148799920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, P_NEG_ACK, peer_req); 1488b411b363SPhilipp Reisner } 1489b411b363SPhilipp Reisner dec_unacked(mdev); 1490b411b363SPhilipp Reisner 149199920dc5SAndreas Gruenbacher return err; 1492b411b363SPhilipp Reisner } 1493b411b363SPhilipp Reisner 1494b411b363SPhilipp Reisner static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local) 1495b411b363SPhilipp Reisner { 1496db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 1497b411b363SPhilipp Reisner 1498db830c46SAndreas Gruenbacher peer_req = read_in_block(mdev, ID_SYNCER, sector, data_size); 1499db830c46SAndreas Gruenbacher if (!peer_req) 150045bb912bSLars Ellenberg goto fail; 1501b411b363SPhilipp Reisner 1502b411b363SPhilipp Reisner dec_rs_pending(mdev); 1503b411b363SPhilipp Reisner 1504b411b363SPhilipp Reisner inc_unacked(mdev); 1505b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_resync_block() 1506b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 1507b411b363SPhilipp Reisner 1508db830c46SAndreas Gruenbacher peer_req->w.cb = e_end_resync_block; 150945bb912bSLars Ellenberg 151087eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1511db830c46SAndreas Gruenbacher list_add(&peer_req->w.list, &mdev->sync_ee); 151287eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1513b411b363SPhilipp Reisner 15140f0601f4SLars Ellenberg atomic_add(data_size >> 9, &mdev->rs_sect_ev); 1515fbe29decSAndreas Gruenbacher if (drbd_submit_peer_request(mdev, peer_req, WRITE, DRBD_FAULT_RS_WR) == 0) 151681e84650SAndreas Gruenbacher return true; 151745bb912bSLars Ellenberg 151810f6d992SLars Ellenberg /* don't care for the reason here */ 151910f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 152087eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1521db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 152287eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 152322cc37a9SLars Ellenberg 1524db830c46SAndreas Gruenbacher drbd_free_ee(mdev, peer_req); 152545bb912bSLars Ellenberg fail: 152645bb912bSLars Ellenberg put_ldev(mdev); 152781e84650SAndreas Gruenbacher return false; 1528b411b363SPhilipp Reisner } 1529b411b363SPhilipp Reisner 1530668eebc6SAndreas Gruenbacher static struct drbd_request * 1531bc9c5c41SAndreas Gruenbacher find_request(struct drbd_conf *mdev, struct rb_root *root, u64 id, 1532bc9c5c41SAndreas Gruenbacher sector_t sector, bool missing_ok, const char *func) 1533668eebc6SAndreas Gruenbacher { 1534668eebc6SAndreas Gruenbacher struct drbd_request *req; 1535668eebc6SAndreas Gruenbacher 1536bc9c5c41SAndreas Gruenbacher /* Request object according to our peer */ 1537bc9c5c41SAndreas Gruenbacher req = (struct drbd_request *)(unsigned long)id; 15385e472264SAndreas Gruenbacher if (drbd_contains_interval(root, sector, &req->i) && req->i.local) 1539668eebc6SAndreas Gruenbacher return req; 1540c3afd8f5SAndreas Gruenbacher if (!missing_ok) { 1541c3afd8f5SAndreas Gruenbacher dev_err(DEV, "%s: failed to find request %lu, sector %llus\n", func, 1542c3afd8f5SAndreas Gruenbacher (unsigned long)id, (unsigned long long)sector); 1543c3afd8f5SAndreas Gruenbacher } 1544668eebc6SAndreas Gruenbacher return NULL; 1545668eebc6SAndreas Gruenbacher } 1546668eebc6SAndreas Gruenbacher 1547d8763023SAndreas Gruenbacher static int receive_DataReply(struct drbd_conf *mdev, enum drbd_packet cmd, 1548d8763023SAndreas Gruenbacher unsigned int data_size) 1549b411b363SPhilipp Reisner { 1550b411b363SPhilipp Reisner struct drbd_request *req; 1551b411b363SPhilipp Reisner sector_t sector; 1552b411b363SPhilipp Reisner int ok; 1553e42325a5SPhilipp Reisner struct p_data *p = &mdev->tconn->data.rbuf.data; 1554b411b363SPhilipp Reisner 1555b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1556b411b363SPhilipp Reisner 155787eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1558bc9c5c41SAndreas Gruenbacher req = find_request(mdev, &mdev->read_requests, p->block_id, sector, false, __func__); 155987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1560c3afd8f5SAndreas Gruenbacher if (unlikely(!req)) 156181e84650SAndreas Gruenbacher return false; 1562b411b363SPhilipp Reisner 156324c4830cSBart Van Assche /* hlist_del(&req->collision) is done in _req_may_be_done, to avoid 1564b411b363SPhilipp Reisner * special casing it there for the various failure cases. 1565b411b363SPhilipp Reisner * still no race with drbd_fail_pending_reads */ 1566b411b363SPhilipp Reisner ok = recv_dless_read(mdev, req, sector, data_size); 1567b411b363SPhilipp Reisner 1568b411b363SPhilipp Reisner if (ok) 15698554df1cSAndreas Gruenbacher req_mod(req, DATA_RECEIVED); 1570b411b363SPhilipp Reisner /* else: nothing. handled from drbd_disconnect... 1571b411b363SPhilipp Reisner * I don't think we may complete this just yet 1572b411b363SPhilipp Reisner * in case we are "on-disconnect: freeze" */ 1573b411b363SPhilipp Reisner 1574b411b363SPhilipp Reisner return ok; 1575b411b363SPhilipp Reisner } 1576b411b363SPhilipp Reisner 1577d8763023SAndreas Gruenbacher static int receive_RSDataReply(struct drbd_conf *mdev, enum drbd_packet cmd, 1578d8763023SAndreas Gruenbacher unsigned int data_size) 1579b411b363SPhilipp Reisner { 1580b411b363SPhilipp Reisner sector_t sector; 1581b411b363SPhilipp Reisner int ok; 1582e42325a5SPhilipp Reisner struct p_data *p = &mdev->tconn->data.rbuf.data; 1583b411b363SPhilipp Reisner 1584b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1585b411b363SPhilipp Reisner D_ASSERT(p->block_id == ID_SYNCER); 1586b411b363SPhilipp Reisner 1587b411b363SPhilipp Reisner if (get_ldev(mdev)) { 1588b411b363SPhilipp Reisner /* data is submitted to disk within recv_resync_read. 1589b411b363SPhilipp Reisner * corresponding put_ldev done below on error, 1590fcefa62eSAndreas Gruenbacher * or in drbd_peer_request_endio. */ 1591b411b363SPhilipp Reisner ok = recv_resync_read(mdev, sector, data_size); 1592b411b363SPhilipp Reisner } else { 1593b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 1594b411b363SPhilipp Reisner dev_err(DEV, "Can not write resync data to local disk.\n"); 1595b411b363SPhilipp Reisner 1596b411b363SPhilipp Reisner ok = drbd_drain_block(mdev, data_size); 1597b411b363SPhilipp Reisner 15982b2bf214SLars Ellenberg drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size); 1599b411b363SPhilipp Reisner } 1600b411b363SPhilipp Reisner 1601778f271dSPhilipp Reisner atomic_add(data_size >> 9, &mdev->rs_sect_in); 1602778f271dSPhilipp Reisner 1603b411b363SPhilipp Reisner return ok; 1604b411b363SPhilipp Reisner } 1605b411b363SPhilipp Reisner 160699920dc5SAndreas Gruenbacher static int w_restart_write(struct drbd_work *w, int cancel) 16077be8da07SAndreas Gruenbacher { 16087be8da07SAndreas Gruenbacher struct drbd_request *req = container_of(w, struct drbd_request, w); 16097be8da07SAndreas Gruenbacher struct drbd_conf *mdev = w->mdev; 16107be8da07SAndreas Gruenbacher struct bio *bio; 16117be8da07SAndreas Gruenbacher unsigned long start_time; 16127be8da07SAndreas Gruenbacher unsigned long flags; 16137be8da07SAndreas Gruenbacher 16147be8da07SAndreas Gruenbacher spin_lock_irqsave(&mdev->tconn->req_lock, flags); 16157be8da07SAndreas Gruenbacher if (!expect(req->rq_state & RQ_POSTPONED)) { 16167be8da07SAndreas Gruenbacher spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); 161799920dc5SAndreas Gruenbacher return -EIO; 16187be8da07SAndreas Gruenbacher } 16197be8da07SAndreas Gruenbacher bio = req->master_bio; 16207be8da07SAndreas Gruenbacher start_time = req->start_time; 16217be8da07SAndreas Gruenbacher /* Postponed requests will not have their master_bio completed! */ 16227be8da07SAndreas Gruenbacher __req_mod(req, DISCARD_WRITE, NULL); 16237be8da07SAndreas Gruenbacher spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); 16247be8da07SAndreas Gruenbacher 16257be8da07SAndreas Gruenbacher while (__drbd_make_request(mdev, bio, start_time)) 16267be8da07SAndreas Gruenbacher /* retry */ ; 162799920dc5SAndreas Gruenbacher return 0; 16287be8da07SAndreas Gruenbacher } 16297be8da07SAndreas Gruenbacher 16307be8da07SAndreas Gruenbacher static void restart_conflicting_writes(struct drbd_conf *mdev, 16317be8da07SAndreas Gruenbacher sector_t sector, int size) 16327be8da07SAndreas Gruenbacher { 16337be8da07SAndreas Gruenbacher struct drbd_interval *i; 16347be8da07SAndreas Gruenbacher struct drbd_request *req; 16357be8da07SAndreas Gruenbacher 16367be8da07SAndreas Gruenbacher drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { 16377be8da07SAndreas Gruenbacher if (!i->local) 16387be8da07SAndreas Gruenbacher continue; 16397be8da07SAndreas Gruenbacher req = container_of(i, struct drbd_request, i); 16407be8da07SAndreas Gruenbacher if (req->rq_state & RQ_LOCAL_PENDING || 16417be8da07SAndreas Gruenbacher !(req->rq_state & RQ_POSTPONED)) 16427be8da07SAndreas Gruenbacher continue; 16437be8da07SAndreas Gruenbacher if (expect(list_empty(&req->w.list))) { 16447be8da07SAndreas Gruenbacher req->w.mdev = mdev; 16457be8da07SAndreas Gruenbacher req->w.cb = w_restart_write; 16467be8da07SAndreas Gruenbacher drbd_queue_work(&mdev->tconn->data.work, &req->w); 16477be8da07SAndreas Gruenbacher } 16487be8da07SAndreas Gruenbacher } 16497be8da07SAndreas Gruenbacher } 16507be8da07SAndreas Gruenbacher 1651b411b363SPhilipp Reisner /* e_end_block() is called via drbd_process_done_ee(). 1652b411b363SPhilipp Reisner * this means this function only runs in the asender thread 1653b411b363SPhilipp Reisner */ 165499920dc5SAndreas Gruenbacher static int e_end_block(struct drbd_work *w, int cancel) 1655b411b363SPhilipp Reisner { 16568050e6d0SAndreas Gruenbacher struct drbd_peer_request *peer_req = 16578050e6d0SAndreas Gruenbacher container_of(w, struct drbd_peer_request, w); 165800d56944SPhilipp Reisner struct drbd_conf *mdev = w->mdev; 1659db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 166099920dc5SAndreas Gruenbacher int err = 0, pcmd; 1661b411b363SPhilipp Reisner 166289e58e75SPhilipp Reisner if (mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C) { 1663db830c46SAndreas Gruenbacher if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { 1664b411b363SPhilipp Reisner pcmd = (mdev->state.conn >= C_SYNC_SOURCE && 1665b411b363SPhilipp Reisner mdev->state.conn <= C_PAUSED_SYNC_T && 1666db830c46SAndreas Gruenbacher peer_req->flags & EE_MAY_SET_IN_SYNC) ? 1667b411b363SPhilipp Reisner P_RS_WRITE_ACK : P_WRITE_ACK; 166899920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, pcmd, peer_req); 1669b411b363SPhilipp Reisner if (pcmd == P_RS_WRITE_ACK) 1670db830c46SAndreas Gruenbacher drbd_set_in_sync(mdev, sector, peer_req->i.size); 1671b411b363SPhilipp Reisner } else { 167299920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, P_NEG_ACK, peer_req); 1673b411b363SPhilipp Reisner /* we expect it to be marked out of sync anyways... 1674b411b363SPhilipp Reisner * maybe assert this? */ 1675b411b363SPhilipp Reisner } 1676b411b363SPhilipp Reisner dec_unacked(mdev); 1677b411b363SPhilipp Reisner } 1678b411b363SPhilipp Reisner /* we delete from the conflict detection hash _after_ we sent out the 1679b411b363SPhilipp Reisner * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ 168089e58e75SPhilipp Reisner if (mdev->tconn->net_conf->two_primaries) { 168187eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1682db830c46SAndreas Gruenbacher D_ASSERT(!drbd_interval_empty(&peer_req->i)); 1683db830c46SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 16847be8da07SAndreas Gruenbacher if (peer_req->flags & EE_RESTART_REQUESTS) 16857be8da07SAndreas Gruenbacher restart_conflicting_writes(mdev, sector, peer_req->i.size); 168687eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1687bb3bfe96SAndreas Gruenbacher } else 1688db830c46SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&peer_req->i)); 1689b411b363SPhilipp Reisner 1690db830c46SAndreas Gruenbacher drbd_may_finish_epoch(mdev, peer_req->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); 1691b411b363SPhilipp Reisner 169299920dc5SAndreas Gruenbacher return err; 1693b411b363SPhilipp Reisner } 1694b411b363SPhilipp Reisner 16957be8da07SAndreas Gruenbacher static int e_send_ack(struct drbd_work *w, enum drbd_packet ack) 1696b411b363SPhilipp Reisner { 16977be8da07SAndreas Gruenbacher struct drbd_conf *mdev = w->mdev; 16988050e6d0SAndreas Gruenbacher struct drbd_peer_request *peer_req = 16998050e6d0SAndreas Gruenbacher container_of(w, struct drbd_peer_request, w); 170099920dc5SAndreas Gruenbacher int err; 1701b411b363SPhilipp Reisner 170299920dc5SAndreas Gruenbacher err = drbd_send_ack(mdev, ack, peer_req); 1703b411b363SPhilipp Reisner dec_unacked(mdev); 1704b411b363SPhilipp Reisner 170599920dc5SAndreas Gruenbacher return err; 1706b411b363SPhilipp Reisner } 1707b411b363SPhilipp Reisner 170899920dc5SAndreas Gruenbacher static int e_send_discard_write(struct drbd_work *w, int unused) 17097be8da07SAndreas Gruenbacher { 17107be8da07SAndreas Gruenbacher return e_send_ack(w, P_DISCARD_WRITE); 17117be8da07SAndreas Gruenbacher } 17127be8da07SAndreas Gruenbacher 171399920dc5SAndreas Gruenbacher static int e_send_retry_write(struct drbd_work *w, int unused) 17147be8da07SAndreas Gruenbacher { 17157be8da07SAndreas Gruenbacher struct drbd_tconn *tconn = w->mdev->tconn; 17167be8da07SAndreas Gruenbacher 17177be8da07SAndreas Gruenbacher return e_send_ack(w, tconn->agreed_pro_version >= 100 ? 17187be8da07SAndreas Gruenbacher P_RETRY_WRITE : P_DISCARD_WRITE); 17197be8da07SAndreas Gruenbacher } 17207be8da07SAndreas Gruenbacher 17213e394da1SAndreas Gruenbacher static bool seq_greater(u32 a, u32 b) 17223e394da1SAndreas Gruenbacher { 17233e394da1SAndreas Gruenbacher /* 17243e394da1SAndreas Gruenbacher * We assume 32-bit wrap-around here. 17253e394da1SAndreas Gruenbacher * For 24-bit wrap-around, we would have to shift: 17263e394da1SAndreas Gruenbacher * a <<= 8; b <<= 8; 17273e394da1SAndreas Gruenbacher */ 17283e394da1SAndreas Gruenbacher return (s32)a - (s32)b > 0; 17293e394da1SAndreas Gruenbacher } 17303e394da1SAndreas Gruenbacher 17313e394da1SAndreas Gruenbacher static u32 seq_max(u32 a, u32 b) 17323e394da1SAndreas Gruenbacher { 17333e394da1SAndreas Gruenbacher return seq_greater(a, b) ? a : b; 17343e394da1SAndreas Gruenbacher } 17353e394da1SAndreas Gruenbacher 17367be8da07SAndreas Gruenbacher static bool need_peer_seq(struct drbd_conf *mdev) 17377be8da07SAndreas Gruenbacher { 17387be8da07SAndreas Gruenbacher struct drbd_tconn *tconn = mdev->tconn; 17397be8da07SAndreas Gruenbacher 17407be8da07SAndreas Gruenbacher /* 17417be8da07SAndreas Gruenbacher * We only need to keep track of the last packet_seq number of our peer 17427be8da07SAndreas Gruenbacher * if we are in dual-primary mode and we have the discard flag set; see 17437be8da07SAndreas Gruenbacher * handle_write_conflicts(). 17447be8da07SAndreas Gruenbacher */ 17457be8da07SAndreas Gruenbacher return tconn->net_conf->two_primaries && 17467be8da07SAndreas Gruenbacher test_bit(DISCARD_CONCURRENT, &tconn->flags); 17477be8da07SAndreas Gruenbacher } 17487be8da07SAndreas Gruenbacher 174943ae077dSAndreas Gruenbacher static void update_peer_seq(struct drbd_conf *mdev, unsigned int peer_seq) 17503e394da1SAndreas Gruenbacher { 17513c13b680SLars Ellenberg unsigned int newest_peer_seq; 17523e394da1SAndreas Gruenbacher 17537be8da07SAndreas Gruenbacher if (need_peer_seq(mdev)) { 17543e394da1SAndreas Gruenbacher spin_lock(&mdev->peer_seq_lock); 17553c13b680SLars Ellenberg newest_peer_seq = seq_max(mdev->peer_seq, peer_seq); 17563c13b680SLars Ellenberg mdev->peer_seq = newest_peer_seq; 17573e394da1SAndreas Gruenbacher spin_unlock(&mdev->peer_seq_lock); 17583c13b680SLars Ellenberg /* wake up only if we actually changed mdev->peer_seq */ 17593c13b680SLars Ellenberg if (peer_seq == newest_peer_seq) 17603e394da1SAndreas Gruenbacher wake_up(&mdev->seq_wait); 17613e394da1SAndreas Gruenbacher } 17627be8da07SAndreas Gruenbacher } 17633e394da1SAndreas Gruenbacher 1764b411b363SPhilipp Reisner /* Called from receive_Data. 1765b411b363SPhilipp Reisner * Synchronize packets on sock with packets on msock. 1766b411b363SPhilipp Reisner * 1767b411b363SPhilipp Reisner * This is here so even when a P_DATA packet traveling via sock overtook an Ack 1768b411b363SPhilipp Reisner * packet traveling on msock, they are still processed in the order they have 1769b411b363SPhilipp Reisner * been sent. 1770b411b363SPhilipp Reisner * 1771b411b363SPhilipp Reisner * Note: we don't care for Ack packets overtaking P_DATA packets. 1772b411b363SPhilipp Reisner * 1773b411b363SPhilipp Reisner * In case packet_seq is larger than mdev->peer_seq number, there are 1774b411b363SPhilipp Reisner * outstanding packets on the msock. We wait for them to arrive. 1775b411b363SPhilipp Reisner * In case we are the logically next packet, we update mdev->peer_seq 1776b411b363SPhilipp Reisner * ourselves. Correctly handles 32bit wrap around. 1777b411b363SPhilipp Reisner * 1778b411b363SPhilipp Reisner * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, 1779b411b363SPhilipp Reisner * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds 1780b411b363SPhilipp Reisner * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have 1781b411b363SPhilipp Reisner * 1<<9 == 512 seconds aka ages for the 32bit wrap around... 1782b411b363SPhilipp Reisner * 1783b411b363SPhilipp Reisner * returns 0 if we may process the packet, 1784b411b363SPhilipp Reisner * -ERESTARTSYS if we were interrupted (by disconnect signal). */ 17857be8da07SAndreas Gruenbacher static int wait_for_and_update_peer_seq(struct drbd_conf *mdev, const u32 peer_seq) 1786b411b363SPhilipp Reisner { 1787b411b363SPhilipp Reisner DEFINE_WAIT(wait); 1788b411b363SPhilipp Reisner long timeout; 17897be8da07SAndreas Gruenbacher int ret; 17907be8da07SAndreas Gruenbacher 17917be8da07SAndreas Gruenbacher if (!need_peer_seq(mdev)) 17927be8da07SAndreas Gruenbacher return 0; 17937be8da07SAndreas Gruenbacher 1794b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1795b411b363SPhilipp Reisner for (;;) { 17967be8da07SAndreas Gruenbacher if (!seq_greater(peer_seq - 1, mdev->peer_seq)) { 17977be8da07SAndreas Gruenbacher mdev->peer_seq = seq_max(mdev->peer_seq, peer_seq); 17987be8da07SAndreas Gruenbacher ret = 0; 1799b411b363SPhilipp Reisner break; 18007be8da07SAndreas Gruenbacher } 1801b411b363SPhilipp Reisner if (signal_pending(current)) { 1802b411b363SPhilipp Reisner ret = -ERESTARTSYS; 1803b411b363SPhilipp Reisner break; 1804b411b363SPhilipp Reisner } 18057be8da07SAndreas Gruenbacher prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE); 1806b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 180771b1c1ebSAndreas Gruenbacher timeout = mdev->tconn->net_conf->ping_timeo*HZ/10; 180871b1c1ebSAndreas Gruenbacher timeout = schedule_timeout(timeout); 1809b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 18107be8da07SAndreas Gruenbacher if (!timeout) { 1811b411b363SPhilipp Reisner ret = -ETIMEDOUT; 181271b1c1ebSAndreas Gruenbacher dev_err(DEV, "Timed out waiting for missing ack packets; disconnecting\n"); 1813b411b363SPhilipp Reisner break; 1814b411b363SPhilipp Reisner } 1815b411b363SPhilipp Reisner } 1816b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 18177be8da07SAndreas Gruenbacher finish_wait(&mdev->seq_wait, &wait); 1818b411b363SPhilipp Reisner return ret; 1819b411b363SPhilipp Reisner } 1820b411b363SPhilipp Reisner 1821688593c5SLars Ellenberg /* see also bio_flags_to_wire() 1822688593c5SLars Ellenberg * DRBD_REQ_*, because we need to semantically map the flags to data packet 1823688593c5SLars Ellenberg * flags and back. We may replicate to other kernel versions. */ 1824688593c5SLars Ellenberg static unsigned long wire_flags_to_bio(struct drbd_conf *mdev, u32 dpf) 182576d2e7ecSPhilipp Reisner { 182676d2e7ecSPhilipp Reisner return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | 182776d2e7ecSPhilipp Reisner (dpf & DP_FUA ? REQ_FUA : 0) | 1828688593c5SLars Ellenberg (dpf & DP_FLUSH ? REQ_FLUSH : 0) | 182976d2e7ecSPhilipp Reisner (dpf & DP_DISCARD ? REQ_DISCARD : 0); 183076d2e7ecSPhilipp Reisner } 183176d2e7ecSPhilipp Reisner 18327be8da07SAndreas Gruenbacher static void fail_postponed_requests(struct drbd_conf *mdev, sector_t sector, 18337be8da07SAndreas Gruenbacher unsigned int size) 18347be8da07SAndreas Gruenbacher { 18357be8da07SAndreas Gruenbacher struct drbd_interval *i; 18367be8da07SAndreas Gruenbacher 18377be8da07SAndreas Gruenbacher repeat: 18387be8da07SAndreas Gruenbacher drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { 18397be8da07SAndreas Gruenbacher struct drbd_request *req; 18407be8da07SAndreas Gruenbacher struct bio_and_error m; 18417be8da07SAndreas Gruenbacher 18427be8da07SAndreas Gruenbacher if (!i->local) 18437be8da07SAndreas Gruenbacher continue; 18447be8da07SAndreas Gruenbacher req = container_of(i, struct drbd_request, i); 18457be8da07SAndreas Gruenbacher if (!(req->rq_state & RQ_POSTPONED)) 18467be8da07SAndreas Gruenbacher continue; 18477be8da07SAndreas Gruenbacher req->rq_state &= ~RQ_POSTPONED; 18487be8da07SAndreas Gruenbacher __req_mod(req, NEG_ACKED, &m); 18497be8da07SAndreas Gruenbacher spin_unlock_irq(&mdev->tconn->req_lock); 18507be8da07SAndreas Gruenbacher if (m.bio) 18517be8da07SAndreas Gruenbacher complete_master_bio(mdev, &m); 18527be8da07SAndreas Gruenbacher spin_lock_irq(&mdev->tconn->req_lock); 18537be8da07SAndreas Gruenbacher goto repeat; 18547be8da07SAndreas Gruenbacher } 18557be8da07SAndreas Gruenbacher } 18567be8da07SAndreas Gruenbacher 18577be8da07SAndreas Gruenbacher static int handle_write_conflicts(struct drbd_conf *mdev, 18587be8da07SAndreas Gruenbacher struct drbd_peer_request *peer_req) 18597be8da07SAndreas Gruenbacher { 18607be8da07SAndreas Gruenbacher struct drbd_tconn *tconn = mdev->tconn; 18617be8da07SAndreas Gruenbacher bool resolve_conflicts = test_bit(DISCARD_CONCURRENT, &tconn->flags); 18627be8da07SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 18637be8da07SAndreas Gruenbacher const unsigned int size = peer_req->i.size; 18647be8da07SAndreas Gruenbacher struct drbd_interval *i; 18657be8da07SAndreas Gruenbacher bool equal; 18667be8da07SAndreas Gruenbacher int err; 18677be8da07SAndreas Gruenbacher 18687be8da07SAndreas Gruenbacher /* 18697be8da07SAndreas Gruenbacher * Inserting the peer request into the write_requests tree will prevent 18707be8da07SAndreas Gruenbacher * new conflicting local requests from being added. 18717be8da07SAndreas Gruenbacher */ 18727be8da07SAndreas Gruenbacher drbd_insert_interval(&mdev->write_requests, &peer_req->i); 18737be8da07SAndreas Gruenbacher 18747be8da07SAndreas Gruenbacher repeat: 18757be8da07SAndreas Gruenbacher drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { 18767be8da07SAndreas Gruenbacher if (i == &peer_req->i) 18777be8da07SAndreas Gruenbacher continue; 18787be8da07SAndreas Gruenbacher 18797be8da07SAndreas Gruenbacher if (!i->local) { 18807be8da07SAndreas Gruenbacher /* 18817be8da07SAndreas Gruenbacher * Our peer has sent a conflicting remote request; this 18827be8da07SAndreas Gruenbacher * should not happen in a two-node setup. Wait for the 18837be8da07SAndreas Gruenbacher * earlier peer request to complete. 18847be8da07SAndreas Gruenbacher */ 18857be8da07SAndreas Gruenbacher err = drbd_wait_misc(mdev, i); 18867be8da07SAndreas Gruenbacher if (err) 18877be8da07SAndreas Gruenbacher goto out; 18887be8da07SAndreas Gruenbacher goto repeat; 18897be8da07SAndreas Gruenbacher } 18907be8da07SAndreas Gruenbacher 18917be8da07SAndreas Gruenbacher equal = i->sector == sector && i->size == size; 18927be8da07SAndreas Gruenbacher if (resolve_conflicts) { 18937be8da07SAndreas Gruenbacher /* 18947be8da07SAndreas Gruenbacher * If the peer request is fully contained within the 18957be8da07SAndreas Gruenbacher * overlapping request, it can be discarded; otherwise, 18967be8da07SAndreas Gruenbacher * it will be retried once all overlapping requests 18977be8da07SAndreas Gruenbacher * have completed. 18987be8da07SAndreas Gruenbacher */ 18997be8da07SAndreas Gruenbacher bool discard = i->sector <= sector && i->sector + 19007be8da07SAndreas Gruenbacher (i->size >> 9) >= sector + (size >> 9); 19017be8da07SAndreas Gruenbacher 19027be8da07SAndreas Gruenbacher if (!equal) 19037be8da07SAndreas Gruenbacher dev_alert(DEV, "Concurrent writes detected: " 19047be8da07SAndreas Gruenbacher "local=%llus +%u, remote=%llus +%u, " 19057be8da07SAndreas Gruenbacher "assuming %s came first\n", 19067be8da07SAndreas Gruenbacher (unsigned long long)i->sector, i->size, 19077be8da07SAndreas Gruenbacher (unsigned long long)sector, size, 19087be8da07SAndreas Gruenbacher discard ? "local" : "remote"); 19097be8da07SAndreas Gruenbacher 19107be8da07SAndreas Gruenbacher inc_unacked(mdev); 19117be8da07SAndreas Gruenbacher peer_req->w.cb = discard ? e_send_discard_write : 19127be8da07SAndreas Gruenbacher e_send_retry_write; 19137be8da07SAndreas Gruenbacher list_add_tail(&peer_req->w.list, &mdev->done_ee); 19147be8da07SAndreas Gruenbacher wake_asender(mdev->tconn); 19157be8da07SAndreas Gruenbacher 19167be8da07SAndreas Gruenbacher err = -ENOENT; 19177be8da07SAndreas Gruenbacher goto out; 19187be8da07SAndreas Gruenbacher } else { 19197be8da07SAndreas Gruenbacher struct drbd_request *req = 19207be8da07SAndreas Gruenbacher container_of(i, struct drbd_request, i); 19217be8da07SAndreas Gruenbacher 19227be8da07SAndreas Gruenbacher if (!equal) 19237be8da07SAndreas Gruenbacher dev_alert(DEV, "Concurrent writes detected: " 19247be8da07SAndreas Gruenbacher "local=%llus +%u, remote=%llus +%u\n", 19257be8da07SAndreas Gruenbacher (unsigned long long)i->sector, i->size, 19267be8da07SAndreas Gruenbacher (unsigned long long)sector, size); 19277be8da07SAndreas Gruenbacher 19287be8da07SAndreas Gruenbacher if (req->rq_state & RQ_LOCAL_PENDING || 19297be8da07SAndreas Gruenbacher !(req->rq_state & RQ_POSTPONED)) { 19307be8da07SAndreas Gruenbacher /* 19317be8da07SAndreas Gruenbacher * Wait for the node with the discard flag to 19327be8da07SAndreas Gruenbacher * decide if this request will be discarded or 19337be8da07SAndreas Gruenbacher * retried. Requests that are discarded will 19347be8da07SAndreas Gruenbacher * disappear from the write_requests tree. 19357be8da07SAndreas Gruenbacher * 19367be8da07SAndreas Gruenbacher * In addition, wait for the conflicting 19377be8da07SAndreas Gruenbacher * request to finish locally before submitting 19387be8da07SAndreas Gruenbacher * the conflicting peer request. 19397be8da07SAndreas Gruenbacher */ 19407be8da07SAndreas Gruenbacher err = drbd_wait_misc(mdev, &req->i); 19417be8da07SAndreas Gruenbacher if (err) { 19427be8da07SAndreas Gruenbacher _conn_request_state(mdev->tconn, 19437be8da07SAndreas Gruenbacher NS(conn, C_TIMEOUT), 19447be8da07SAndreas Gruenbacher CS_HARD); 19457be8da07SAndreas Gruenbacher fail_postponed_requests(mdev, sector, size); 19467be8da07SAndreas Gruenbacher goto out; 19477be8da07SAndreas Gruenbacher } 19487be8da07SAndreas Gruenbacher goto repeat; 19497be8da07SAndreas Gruenbacher } 19507be8da07SAndreas Gruenbacher /* 19517be8da07SAndreas Gruenbacher * Remember to restart the conflicting requests after 19527be8da07SAndreas Gruenbacher * the new peer request has completed. 19537be8da07SAndreas Gruenbacher */ 19547be8da07SAndreas Gruenbacher peer_req->flags |= EE_RESTART_REQUESTS; 19557be8da07SAndreas Gruenbacher } 19567be8da07SAndreas Gruenbacher } 19577be8da07SAndreas Gruenbacher err = 0; 19587be8da07SAndreas Gruenbacher 19597be8da07SAndreas Gruenbacher out: 19607be8da07SAndreas Gruenbacher if (err) 19617be8da07SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 19627be8da07SAndreas Gruenbacher return err; 19637be8da07SAndreas Gruenbacher } 19647be8da07SAndreas Gruenbacher 1965b411b363SPhilipp Reisner /* mirrored write */ 1966d8763023SAndreas Gruenbacher static int receive_Data(struct drbd_conf *mdev, enum drbd_packet cmd, 1967d8763023SAndreas Gruenbacher unsigned int data_size) 1968b411b363SPhilipp Reisner { 1969b411b363SPhilipp Reisner sector_t sector; 1970db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 1971e42325a5SPhilipp Reisner struct p_data *p = &mdev->tconn->data.rbuf.data; 19727be8da07SAndreas Gruenbacher u32 peer_seq = be32_to_cpu(p->seq_num); 1973b411b363SPhilipp Reisner int rw = WRITE; 1974b411b363SPhilipp Reisner u32 dp_flags; 19757be8da07SAndreas Gruenbacher int err; 19767be8da07SAndreas Gruenbacher 1977b411b363SPhilipp Reisner 1978b411b363SPhilipp Reisner if (!get_ldev(mdev)) { 19797be8da07SAndreas Gruenbacher err = wait_for_and_update_peer_seq(mdev, peer_seq); 19802b2bf214SLars Ellenberg drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size); 1981b411b363SPhilipp Reisner atomic_inc(&mdev->current_epoch->epoch_size); 19827be8da07SAndreas Gruenbacher return drbd_drain_block(mdev, data_size) && err == 0; 1983b411b363SPhilipp Reisner } 1984b411b363SPhilipp Reisner 1985fcefa62eSAndreas Gruenbacher /* 1986fcefa62eSAndreas Gruenbacher * Corresponding put_ldev done either below (on various errors), or in 1987fcefa62eSAndreas Gruenbacher * drbd_peer_request_endio, if we successfully submit the data at the 1988fcefa62eSAndreas Gruenbacher * end of this function. 1989fcefa62eSAndreas Gruenbacher */ 1990b411b363SPhilipp Reisner 1991b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1992db830c46SAndreas Gruenbacher peer_req = read_in_block(mdev, p->block_id, sector, data_size); 1993db830c46SAndreas Gruenbacher if (!peer_req) { 1994b411b363SPhilipp Reisner put_ldev(mdev); 199581e84650SAndreas Gruenbacher return false; 1996b411b363SPhilipp Reisner } 1997b411b363SPhilipp Reisner 1998db830c46SAndreas Gruenbacher peer_req->w.cb = e_end_block; 1999b411b363SPhilipp Reisner 2000688593c5SLars Ellenberg dp_flags = be32_to_cpu(p->dp_flags); 2001688593c5SLars Ellenberg rw |= wire_flags_to_bio(mdev, dp_flags); 2002688593c5SLars Ellenberg 2003688593c5SLars Ellenberg if (dp_flags & DP_MAY_SET_IN_SYNC) 2004db830c46SAndreas Gruenbacher peer_req->flags |= EE_MAY_SET_IN_SYNC; 2005688593c5SLars Ellenberg 2006b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 2007db830c46SAndreas Gruenbacher peer_req->epoch = mdev->current_epoch; 2008db830c46SAndreas Gruenbacher atomic_inc(&peer_req->epoch->epoch_size); 2009db830c46SAndreas Gruenbacher atomic_inc(&peer_req->epoch->active); 2010b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 2011b411b363SPhilipp Reisner 20127be8da07SAndreas Gruenbacher if (mdev->tconn->net_conf->two_primaries) { 20137be8da07SAndreas Gruenbacher err = wait_for_and_update_peer_seq(mdev, peer_seq); 20147be8da07SAndreas Gruenbacher if (err) 2015b411b363SPhilipp Reisner goto out_interrupted; 201687eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 20177be8da07SAndreas Gruenbacher err = handle_write_conflicts(mdev, peer_req); 20187be8da07SAndreas Gruenbacher if (err) { 201987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 20207be8da07SAndreas Gruenbacher if (err == -ENOENT) { 2021b411b363SPhilipp Reisner put_ldev(mdev); 202281e84650SAndreas Gruenbacher return true; 2023b411b363SPhilipp Reisner } 2024b411b363SPhilipp Reisner goto out_interrupted; 2025b411b363SPhilipp Reisner } 20267be8da07SAndreas Gruenbacher } else 202787eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2028db830c46SAndreas Gruenbacher list_add(&peer_req->w.list, &mdev->active_ee); 202987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 2030b411b363SPhilipp Reisner 203189e58e75SPhilipp Reisner switch (mdev->tconn->net_conf->wire_protocol) { 2032b411b363SPhilipp Reisner case DRBD_PROT_C: 2033b411b363SPhilipp Reisner inc_unacked(mdev); 2034b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_block() 2035b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 2036b411b363SPhilipp Reisner break; 2037b411b363SPhilipp Reisner case DRBD_PROT_B: 2038b411b363SPhilipp Reisner /* I really don't like it that the receiver thread 2039b411b363SPhilipp Reisner * sends on the msock, but anyways */ 2040db830c46SAndreas Gruenbacher drbd_send_ack(mdev, P_RECV_ACK, peer_req); 2041b411b363SPhilipp Reisner break; 2042b411b363SPhilipp Reisner case DRBD_PROT_A: 2043b411b363SPhilipp Reisner /* nothing to do */ 2044b411b363SPhilipp Reisner break; 2045b411b363SPhilipp Reisner } 2046b411b363SPhilipp Reisner 20476719fb03SLars Ellenberg if (mdev->state.pdsk < D_INCONSISTENT) { 2048b411b363SPhilipp Reisner /* In case we have the only disk of the cluster, */ 2049db830c46SAndreas Gruenbacher drbd_set_out_of_sync(mdev, peer_req->i.sector, peer_req->i.size); 2050db830c46SAndreas Gruenbacher peer_req->flags |= EE_CALL_AL_COMPLETE_IO; 2051db830c46SAndreas Gruenbacher peer_req->flags &= ~EE_MAY_SET_IN_SYNC; 2052db830c46SAndreas Gruenbacher drbd_al_begin_io(mdev, peer_req->i.sector); 2053b411b363SPhilipp Reisner } 2054b411b363SPhilipp Reisner 2055fbe29decSAndreas Gruenbacher if (drbd_submit_peer_request(mdev, peer_req, rw, DRBD_FAULT_DT_WR) == 0) 205681e84650SAndreas Gruenbacher return true; 2057b411b363SPhilipp Reisner 205810f6d992SLars Ellenberg /* don't care for the reason here */ 205910f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 206087eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2061db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 2062db830c46SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 206387eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 2064db830c46SAndreas Gruenbacher if (peer_req->flags & EE_CALL_AL_COMPLETE_IO) 2065db830c46SAndreas Gruenbacher drbd_al_complete_io(mdev, peer_req->i.sector); 206622cc37a9SLars Ellenberg 2067b411b363SPhilipp Reisner out_interrupted: 2068db830c46SAndreas Gruenbacher drbd_may_finish_epoch(mdev, peer_req->epoch, EV_PUT + EV_CLEANUP); 2069b411b363SPhilipp Reisner put_ldev(mdev); 2070db830c46SAndreas Gruenbacher drbd_free_ee(mdev, peer_req); 207181e84650SAndreas Gruenbacher return false; 2072b411b363SPhilipp Reisner } 2073b411b363SPhilipp Reisner 20740f0601f4SLars Ellenberg /* We may throttle resync, if the lower device seems to be busy, 20750f0601f4SLars Ellenberg * and current sync rate is above c_min_rate. 20760f0601f4SLars Ellenberg * 20770f0601f4SLars Ellenberg * To decide whether or not the lower device is busy, we use a scheme similar 20780f0601f4SLars Ellenberg * to MD RAID is_mddev_idle(): if the partition stats reveal "significant" 20790f0601f4SLars Ellenberg * (more than 64 sectors) of activity we cannot account for with our own resync 20800f0601f4SLars Ellenberg * activity, it obviously is "busy". 20810f0601f4SLars Ellenberg * 20820f0601f4SLars Ellenberg * The current sync rate used here uses only the most recent two step marks, 20830f0601f4SLars Ellenberg * to have a short time average so we can react faster. 20840f0601f4SLars Ellenberg */ 2085e3555d85SPhilipp Reisner int drbd_rs_should_slow_down(struct drbd_conf *mdev, sector_t sector) 20860f0601f4SLars Ellenberg { 20870f0601f4SLars Ellenberg struct gendisk *disk = mdev->ldev->backing_bdev->bd_contains->bd_disk; 20880f0601f4SLars Ellenberg unsigned long db, dt, dbdt; 2089e3555d85SPhilipp Reisner struct lc_element *tmp; 20900f0601f4SLars Ellenberg int curr_events; 20910f0601f4SLars Ellenberg int throttle = 0; 20920f0601f4SLars Ellenberg 20930f0601f4SLars Ellenberg /* feature disabled? */ 2094f399002eSLars Ellenberg if (mdev->ldev->dc.c_min_rate == 0) 20950f0601f4SLars Ellenberg return 0; 20960f0601f4SLars Ellenberg 2097e3555d85SPhilipp Reisner spin_lock_irq(&mdev->al_lock); 2098e3555d85SPhilipp Reisner tmp = lc_find(mdev->resync, BM_SECT_TO_EXT(sector)); 2099e3555d85SPhilipp Reisner if (tmp) { 2100e3555d85SPhilipp Reisner struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); 2101e3555d85SPhilipp Reisner if (test_bit(BME_PRIORITY, &bm_ext->flags)) { 2102e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 2103e3555d85SPhilipp Reisner return 0; 2104e3555d85SPhilipp Reisner } 2105e3555d85SPhilipp Reisner /* Do not slow down if app IO is already waiting for this extent */ 2106e3555d85SPhilipp Reisner } 2107e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 2108e3555d85SPhilipp Reisner 21090f0601f4SLars Ellenberg curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + 21100f0601f4SLars Ellenberg (int)part_stat_read(&disk->part0, sectors[1]) - 21110f0601f4SLars Ellenberg atomic_read(&mdev->rs_sect_ev); 2112e3555d85SPhilipp Reisner 21130f0601f4SLars Ellenberg if (!mdev->rs_last_events || curr_events - mdev->rs_last_events > 64) { 21140f0601f4SLars Ellenberg unsigned long rs_left; 21150f0601f4SLars Ellenberg int i; 21160f0601f4SLars Ellenberg 21170f0601f4SLars Ellenberg mdev->rs_last_events = curr_events; 21180f0601f4SLars Ellenberg 21190f0601f4SLars Ellenberg /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, 21200f0601f4SLars Ellenberg * approx. */ 21212649f080SLars Ellenberg i = (mdev->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; 21222649f080SLars Ellenberg 21232649f080SLars Ellenberg if (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T) 21242649f080SLars Ellenberg rs_left = mdev->ov_left; 21252649f080SLars Ellenberg else 21260f0601f4SLars Ellenberg rs_left = drbd_bm_total_weight(mdev) - mdev->rs_failed; 21270f0601f4SLars Ellenberg 21280f0601f4SLars Ellenberg dt = ((long)jiffies - (long)mdev->rs_mark_time[i]) / HZ; 21290f0601f4SLars Ellenberg if (!dt) 21300f0601f4SLars Ellenberg dt++; 21310f0601f4SLars Ellenberg db = mdev->rs_mark_left[i] - rs_left; 21320f0601f4SLars Ellenberg dbdt = Bit2KB(db/dt); 21330f0601f4SLars Ellenberg 2134f399002eSLars Ellenberg if (dbdt > mdev->ldev->dc.c_min_rate) 21350f0601f4SLars Ellenberg throttle = 1; 21360f0601f4SLars Ellenberg } 21370f0601f4SLars Ellenberg return throttle; 21380f0601f4SLars Ellenberg } 21390f0601f4SLars Ellenberg 21400f0601f4SLars Ellenberg 2141d8763023SAndreas Gruenbacher static int receive_DataRequest(struct drbd_conf *mdev, enum drbd_packet cmd, 2142d8763023SAndreas Gruenbacher unsigned int digest_size) 2143b411b363SPhilipp Reisner { 2144b411b363SPhilipp Reisner sector_t sector; 2145b411b363SPhilipp Reisner const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 2146db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 2147b411b363SPhilipp Reisner struct digest_info *di = NULL; 2148b18b37beSPhilipp Reisner int size, verb; 2149b411b363SPhilipp Reisner unsigned int fault_type; 2150e42325a5SPhilipp Reisner struct p_block_req *p = &mdev->tconn->data.rbuf.block_req; 2151b411b363SPhilipp Reisner 2152b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 2153b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 2154b411b363SPhilipp Reisner 2155c670a398SAndreas Gruenbacher if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) { 2156b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 2157b411b363SPhilipp Reisner (unsigned long long)sector, size); 215881e84650SAndreas Gruenbacher return false; 2159b411b363SPhilipp Reisner } 2160b411b363SPhilipp Reisner if (sector + (size>>9) > capacity) { 2161b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 2162b411b363SPhilipp Reisner (unsigned long long)sector, size); 216381e84650SAndreas Gruenbacher return false; 2164b411b363SPhilipp Reisner } 2165b411b363SPhilipp Reisner 2166b411b363SPhilipp Reisner if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) { 2167b18b37beSPhilipp Reisner verb = 1; 2168b18b37beSPhilipp Reisner switch (cmd) { 2169b18b37beSPhilipp Reisner case P_DATA_REQUEST: 2170b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_DREPLY, p); 2171b18b37beSPhilipp Reisner break; 2172b18b37beSPhilipp Reisner case P_RS_DATA_REQUEST: 2173b18b37beSPhilipp Reisner case P_CSUM_RS_REQUEST: 2174b18b37beSPhilipp Reisner case P_OV_REQUEST: 2175b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_RS_DREPLY , p); 2176b18b37beSPhilipp Reisner break; 2177b18b37beSPhilipp Reisner case P_OV_REPLY: 2178b18b37beSPhilipp Reisner verb = 0; 2179b18b37beSPhilipp Reisner dec_rs_pending(mdev); 2180b18b37beSPhilipp Reisner drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, ID_IN_SYNC); 2181b18b37beSPhilipp Reisner break; 2182b18b37beSPhilipp Reisner default: 2183b18b37beSPhilipp Reisner dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n", 2184b18b37beSPhilipp Reisner cmdname(cmd)); 2185b18b37beSPhilipp Reisner } 2186b18b37beSPhilipp Reisner if (verb && __ratelimit(&drbd_ratelimit_state)) 2187b411b363SPhilipp Reisner dev_err(DEV, "Can not satisfy peer's read request, " 2188b411b363SPhilipp Reisner "no local data.\n"); 2189b18b37beSPhilipp Reisner 2190a821cc4aSLars Ellenberg /* drain possibly payload */ 2191a821cc4aSLars Ellenberg return drbd_drain_block(mdev, digest_size); 2192b411b363SPhilipp Reisner } 2193b411b363SPhilipp Reisner 2194b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 2195b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 2196b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 2197db830c46SAndreas Gruenbacher peer_req = drbd_alloc_ee(mdev, p->block_id, sector, size, GFP_NOIO); 2198db830c46SAndreas Gruenbacher if (!peer_req) { 2199b411b363SPhilipp Reisner put_ldev(mdev); 220081e84650SAndreas Gruenbacher return false; 2201b411b363SPhilipp Reisner } 2202b411b363SPhilipp Reisner 220302918be2SPhilipp Reisner switch (cmd) { 2204b411b363SPhilipp Reisner case P_DATA_REQUEST: 2205db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_data_req; 2206b411b363SPhilipp Reisner fault_type = DRBD_FAULT_DT_RD; 220780a40e43SLars Ellenberg /* application IO, don't drbd_rs_begin_io */ 220880a40e43SLars Ellenberg goto submit; 220980a40e43SLars Ellenberg 2210b411b363SPhilipp Reisner case P_RS_DATA_REQUEST: 2211db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_rsdata_req; 2212b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 22135f9915bbSLars Ellenberg /* used in the sector offset progress display */ 22145f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 2215b411b363SPhilipp Reisner break; 2216b411b363SPhilipp Reisner 2217b411b363SPhilipp Reisner case P_OV_REPLY: 2218b411b363SPhilipp Reisner case P_CSUM_RS_REQUEST: 2219b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2220b411b363SPhilipp Reisner di = kmalloc(sizeof(*di) + digest_size, GFP_NOIO); 2221b411b363SPhilipp Reisner if (!di) 2222b411b363SPhilipp Reisner goto out_free_e; 2223b411b363SPhilipp Reisner 2224b411b363SPhilipp Reisner di->digest_size = digest_size; 2225b411b363SPhilipp Reisner di->digest = (((char *)di)+sizeof(struct digest_info)); 2226b411b363SPhilipp Reisner 2227db830c46SAndreas Gruenbacher peer_req->digest = di; 2228db830c46SAndreas Gruenbacher peer_req->flags |= EE_HAS_DIGEST; 2229c36c3cedSLars Ellenberg 2230de0ff338SPhilipp Reisner if (drbd_recv(mdev->tconn, di->digest, digest_size) != digest_size) 2231b411b363SPhilipp Reisner goto out_free_e; 2232b411b363SPhilipp Reisner 223302918be2SPhilipp Reisner if (cmd == P_CSUM_RS_REQUEST) { 223431890f4aSPhilipp Reisner D_ASSERT(mdev->tconn->agreed_pro_version >= 89); 2235db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_csum_rs_req; 22365f9915bbSLars Ellenberg /* used in the sector offset progress display */ 22375f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 223802918be2SPhilipp Reisner } else if (cmd == P_OV_REPLY) { 22392649f080SLars Ellenberg /* track progress, we may need to throttle */ 22402649f080SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_in); 2241db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_ov_reply; 2242b411b363SPhilipp Reisner dec_rs_pending(mdev); 22430f0601f4SLars Ellenberg /* drbd_rs_begin_io done when we sent this request, 22440f0601f4SLars Ellenberg * but accounting still needs to be done. */ 22450f0601f4SLars Ellenberg goto submit_for_resync; 2246b411b363SPhilipp Reisner } 2247b411b363SPhilipp Reisner break; 2248b411b363SPhilipp Reisner 2249b411b363SPhilipp Reisner case P_OV_REQUEST: 2250b411b363SPhilipp Reisner if (mdev->ov_start_sector == ~(sector_t)0 && 225131890f4aSPhilipp Reisner mdev->tconn->agreed_pro_version >= 90) { 2252de228bbaSLars Ellenberg unsigned long now = jiffies; 2253de228bbaSLars Ellenberg int i; 2254b411b363SPhilipp Reisner mdev->ov_start_sector = sector; 2255b411b363SPhilipp Reisner mdev->ov_position = sector; 225630b743a2SLars Ellenberg mdev->ov_left = drbd_bm_bits(mdev) - BM_SECT_TO_BIT(sector); 225730b743a2SLars Ellenberg mdev->rs_total = mdev->ov_left; 2258de228bbaSLars Ellenberg for (i = 0; i < DRBD_SYNC_MARKS; i++) { 2259de228bbaSLars Ellenberg mdev->rs_mark_left[i] = mdev->ov_left; 2260de228bbaSLars Ellenberg mdev->rs_mark_time[i] = now; 2261de228bbaSLars Ellenberg } 2262b411b363SPhilipp Reisner dev_info(DEV, "Online Verify start sector: %llu\n", 2263b411b363SPhilipp Reisner (unsigned long long)sector); 2264b411b363SPhilipp Reisner } 2265db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_ov_req; 2266b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2267b411b363SPhilipp Reisner break; 2268b411b363SPhilipp Reisner 2269b411b363SPhilipp Reisner default: 2270b411b363SPhilipp Reisner dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n", 227102918be2SPhilipp Reisner cmdname(cmd)); 2272b411b363SPhilipp Reisner fault_type = DRBD_FAULT_MAX; 227380a40e43SLars Ellenberg goto out_free_e; 2274b411b363SPhilipp Reisner } 2275b411b363SPhilipp Reisner 22760f0601f4SLars Ellenberg /* Throttle, drbd_rs_begin_io and submit should become asynchronous 22770f0601f4SLars Ellenberg * wrt the receiver, but it is not as straightforward as it may seem. 22780f0601f4SLars Ellenberg * Various places in the resync start and stop logic assume resync 22790f0601f4SLars Ellenberg * requests are processed in order, requeuing this on the worker thread 22800f0601f4SLars Ellenberg * introduces a bunch of new code for synchronization between threads. 22810f0601f4SLars Ellenberg * 22820f0601f4SLars Ellenberg * Unlimited throttling before drbd_rs_begin_io may stall the resync 22830f0601f4SLars Ellenberg * "forever", throttling after drbd_rs_begin_io will lock that extent 22840f0601f4SLars Ellenberg * for application writes for the same time. For now, just throttle 22850f0601f4SLars Ellenberg * here, where the rest of the code expects the receiver to sleep for 22860f0601f4SLars Ellenberg * a while, anyways. 22870f0601f4SLars Ellenberg */ 2288b411b363SPhilipp Reisner 22890f0601f4SLars Ellenberg /* Throttle before drbd_rs_begin_io, as that locks out application IO; 22900f0601f4SLars Ellenberg * this defers syncer requests for some time, before letting at least 22910f0601f4SLars Ellenberg * on request through. The resync controller on the receiving side 22920f0601f4SLars Ellenberg * will adapt to the incoming rate accordingly. 22930f0601f4SLars Ellenberg * 22940f0601f4SLars Ellenberg * We cannot throttle here if remote is Primary/SyncTarget: 22950f0601f4SLars Ellenberg * we would also throttle its application reads. 22960f0601f4SLars Ellenberg * In that case, throttling is done on the SyncTarget only. 22970f0601f4SLars Ellenberg */ 2298e3555d85SPhilipp Reisner if (mdev->state.peer != R_PRIMARY && drbd_rs_should_slow_down(mdev, sector)) 2299e3555d85SPhilipp Reisner schedule_timeout_uninterruptible(HZ/10); 2300e3555d85SPhilipp Reisner if (drbd_rs_begin_io(mdev, sector)) 230180a40e43SLars Ellenberg goto out_free_e; 2302b411b363SPhilipp Reisner 23030f0601f4SLars Ellenberg submit_for_resync: 23040f0601f4SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_ev); 23050f0601f4SLars Ellenberg 230680a40e43SLars Ellenberg submit: 2307b411b363SPhilipp Reisner inc_unacked(mdev); 230887eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2309db830c46SAndreas Gruenbacher list_add_tail(&peer_req->w.list, &mdev->read_ee); 231087eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 2311b411b363SPhilipp Reisner 2312fbe29decSAndreas Gruenbacher if (drbd_submit_peer_request(mdev, peer_req, READ, fault_type) == 0) 231381e84650SAndreas Gruenbacher return true; 2314b411b363SPhilipp Reisner 231510f6d992SLars Ellenberg /* don't care for the reason here */ 231610f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 231787eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2318db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 231987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 232022cc37a9SLars Ellenberg /* no drbd_rs_complete_io(), we are dropping the connection anyways */ 232122cc37a9SLars Ellenberg 2322b411b363SPhilipp Reisner out_free_e: 2323b411b363SPhilipp Reisner put_ldev(mdev); 2324db830c46SAndreas Gruenbacher drbd_free_ee(mdev, peer_req); 232581e84650SAndreas Gruenbacher return false; 2326b411b363SPhilipp Reisner } 2327b411b363SPhilipp Reisner 2328b411b363SPhilipp Reisner static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local) 2329b411b363SPhilipp Reisner { 2330b411b363SPhilipp Reisner int self, peer, rv = -100; 2331b411b363SPhilipp Reisner unsigned long ch_self, ch_peer; 2332b411b363SPhilipp Reisner 2333b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & 1; 2334b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & 1; 2335b411b363SPhilipp Reisner 2336b411b363SPhilipp Reisner ch_peer = mdev->p_uuid[UI_SIZE]; 2337b411b363SPhilipp Reisner ch_self = mdev->comm_bm_set; 2338b411b363SPhilipp Reisner 233989e58e75SPhilipp Reisner switch (mdev->tconn->net_conf->after_sb_0p) { 2340b411b363SPhilipp Reisner case ASB_CONSENSUS: 2341b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2342b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2343b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2344b411b363SPhilipp Reisner break; 2345b411b363SPhilipp Reisner case ASB_DISCONNECT: 2346b411b363SPhilipp Reisner break; 2347b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2348b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2349b411b363SPhilipp Reisner rv = -1; 2350b411b363SPhilipp Reisner break; 2351b411b363SPhilipp Reisner } 2352b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2353b411b363SPhilipp Reisner rv = 1; 2354b411b363SPhilipp Reisner break; 2355b411b363SPhilipp Reisner } 2356b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2357b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2358b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2359b411b363SPhilipp Reisner rv = 1; 2360b411b363SPhilipp Reisner break; 2361b411b363SPhilipp Reisner } 2362b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2363b411b363SPhilipp Reisner rv = -1; 2364b411b363SPhilipp Reisner break; 2365b411b363SPhilipp Reisner } 2366b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2367ad19bf6eSLars Ellenberg dev_warn(DEV, "Discard younger/older primary did not find a decision\n" 2368b411b363SPhilipp Reisner "Using discard-least-changes instead\n"); 2369b411b363SPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2370b411b363SPhilipp Reisner if (ch_peer == 0 && ch_self == 0) { 237125703f83SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) 2372b411b363SPhilipp Reisner ? -1 : 1; 2373b411b363SPhilipp Reisner break; 2374b411b363SPhilipp Reisner } else { 2375b411b363SPhilipp Reisner if (ch_peer == 0) { rv = 1; break; } 2376b411b363SPhilipp Reisner if (ch_self == 0) { rv = -1; break; } 2377b411b363SPhilipp Reisner } 237889e58e75SPhilipp Reisner if (mdev->tconn->net_conf->after_sb_0p == ASB_DISCARD_ZERO_CHG) 2379b411b363SPhilipp Reisner break; 2380b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2381b411b363SPhilipp Reisner if (ch_self < ch_peer) 2382b411b363SPhilipp Reisner rv = -1; 2383b411b363SPhilipp Reisner else if (ch_self > ch_peer) 2384b411b363SPhilipp Reisner rv = 1; 2385b411b363SPhilipp Reisner else /* ( ch_self == ch_peer ) */ 2386b411b363SPhilipp Reisner /* Well, then use something else. */ 238725703f83SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) 2388b411b363SPhilipp Reisner ? -1 : 1; 2389b411b363SPhilipp Reisner break; 2390b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2391b411b363SPhilipp Reisner rv = -1; 2392b411b363SPhilipp Reisner break; 2393b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2394b411b363SPhilipp Reisner rv = 1; 2395b411b363SPhilipp Reisner } 2396b411b363SPhilipp Reisner 2397b411b363SPhilipp Reisner return rv; 2398b411b363SPhilipp Reisner } 2399b411b363SPhilipp Reisner 2400b411b363SPhilipp Reisner static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local) 2401b411b363SPhilipp Reisner { 24026184ea21SAndreas Gruenbacher int hg, rv = -100; 2403b411b363SPhilipp Reisner 240489e58e75SPhilipp Reisner switch (mdev->tconn->net_conf->after_sb_1p) { 2405b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2406b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2407b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2408b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2409b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2410b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2411b411b363SPhilipp Reisner break; 2412b411b363SPhilipp Reisner case ASB_DISCONNECT: 2413b411b363SPhilipp Reisner break; 2414b411b363SPhilipp Reisner case ASB_CONSENSUS: 2415b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2416b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_SECONDARY) 2417b411b363SPhilipp Reisner rv = hg; 2418b411b363SPhilipp Reisner if (hg == 1 && mdev->state.role == R_PRIMARY) 2419b411b363SPhilipp Reisner rv = hg; 2420b411b363SPhilipp Reisner break; 2421b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2422b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2423b411b363SPhilipp Reisner break; 2424b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2425b411b363SPhilipp Reisner return mdev->state.role == R_PRIMARY ? 1 : -1; 2426b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2427b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2428b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_PRIMARY) { 2429bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2430bb437946SAndreas Gruenbacher 2431bb437946SAndreas Gruenbacher drbd_set_role(mdev, R_SECONDARY, 0); 2432b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2433b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2434b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2435bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2436bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2437b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2438b411b363SPhilipp Reisner } else { 2439b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2440b411b363SPhilipp Reisner rv = hg; 2441b411b363SPhilipp Reisner } 2442b411b363SPhilipp Reisner } else 2443b411b363SPhilipp Reisner rv = hg; 2444b411b363SPhilipp Reisner } 2445b411b363SPhilipp Reisner 2446b411b363SPhilipp Reisner return rv; 2447b411b363SPhilipp Reisner } 2448b411b363SPhilipp Reisner 2449b411b363SPhilipp Reisner static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local) 2450b411b363SPhilipp Reisner { 24516184ea21SAndreas Gruenbacher int hg, rv = -100; 2452b411b363SPhilipp Reisner 245389e58e75SPhilipp Reisner switch (mdev->tconn->net_conf->after_sb_2p) { 2454b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2455b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2456b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2457b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2458b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2459b411b363SPhilipp Reisner case ASB_CONSENSUS: 2460b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2461b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2462b411b363SPhilipp Reisner break; 2463b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2464b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2465b411b363SPhilipp Reisner break; 2466b411b363SPhilipp Reisner case ASB_DISCONNECT: 2467b411b363SPhilipp Reisner break; 2468b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2469b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2470b411b363SPhilipp Reisner if (hg == -1) { 2471bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2472bb437946SAndreas Gruenbacher 2473b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2474b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2475b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2476bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2477bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2478b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2479b411b363SPhilipp Reisner } else { 2480b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2481b411b363SPhilipp Reisner rv = hg; 2482b411b363SPhilipp Reisner } 2483b411b363SPhilipp Reisner } else 2484b411b363SPhilipp Reisner rv = hg; 2485b411b363SPhilipp Reisner } 2486b411b363SPhilipp Reisner 2487b411b363SPhilipp Reisner return rv; 2488b411b363SPhilipp Reisner } 2489b411b363SPhilipp Reisner 2490b411b363SPhilipp Reisner static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid, 2491b411b363SPhilipp Reisner u64 bits, u64 flags) 2492b411b363SPhilipp Reisner { 2493b411b363SPhilipp Reisner if (!uuid) { 2494b411b363SPhilipp Reisner dev_info(DEV, "%s uuid info vanished while I was looking!\n", text); 2495b411b363SPhilipp Reisner return; 2496b411b363SPhilipp Reisner } 2497b411b363SPhilipp Reisner dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", 2498b411b363SPhilipp Reisner text, 2499b411b363SPhilipp Reisner (unsigned long long)uuid[UI_CURRENT], 2500b411b363SPhilipp Reisner (unsigned long long)uuid[UI_BITMAP], 2501b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_START], 2502b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_END], 2503b411b363SPhilipp Reisner (unsigned long long)bits, 2504b411b363SPhilipp Reisner (unsigned long long)flags); 2505b411b363SPhilipp Reisner } 2506b411b363SPhilipp Reisner 2507b411b363SPhilipp Reisner /* 2508b411b363SPhilipp Reisner 100 after split brain try auto recover 2509b411b363SPhilipp Reisner 2 C_SYNC_SOURCE set BitMap 2510b411b363SPhilipp Reisner 1 C_SYNC_SOURCE use BitMap 2511b411b363SPhilipp Reisner 0 no Sync 2512b411b363SPhilipp Reisner -1 C_SYNC_TARGET use BitMap 2513b411b363SPhilipp Reisner -2 C_SYNC_TARGET set BitMap 2514b411b363SPhilipp Reisner -100 after split brain, disconnect 2515b411b363SPhilipp Reisner -1000 unrelated data 25164a23f264SPhilipp Reisner -1091 requires proto 91 25174a23f264SPhilipp Reisner -1096 requires proto 96 2518b411b363SPhilipp Reisner */ 2519b411b363SPhilipp Reisner static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local) 2520b411b363SPhilipp Reisner { 2521b411b363SPhilipp Reisner u64 self, peer; 2522b411b363SPhilipp Reisner int i, j; 2523b411b363SPhilipp Reisner 2524b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2525b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2526b411b363SPhilipp Reisner 2527b411b363SPhilipp Reisner *rule_nr = 10; 2528b411b363SPhilipp Reisner if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) 2529b411b363SPhilipp Reisner return 0; 2530b411b363SPhilipp Reisner 2531b411b363SPhilipp Reisner *rule_nr = 20; 2532b411b363SPhilipp Reisner if ((self == UUID_JUST_CREATED || self == (u64)0) && 2533b411b363SPhilipp Reisner peer != UUID_JUST_CREATED) 2534b411b363SPhilipp Reisner return -2; 2535b411b363SPhilipp Reisner 2536b411b363SPhilipp Reisner *rule_nr = 30; 2537b411b363SPhilipp Reisner if (self != UUID_JUST_CREATED && 2538b411b363SPhilipp Reisner (peer == UUID_JUST_CREATED || peer == (u64)0)) 2539b411b363SPhilipp Reisner return 2; 2540b411b363SPhilipp Reisner 2541b411b363SPhilipp Reisner if (self == peer) { 2542b411b363SPhilipp Reisner int rct, dc; /* roles at crash time */ 2543b411b363SPhilipp Reisner 2544b411b363SPhilipp Reisner if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) { 2545b411b363SPhilipp Reisner 254631890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 25474a23f264SPhilipp Reisner return -1091; 2548b411b363SPhilipp Reisner 2549b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) && 2550b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { 2551b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n"); 2552b411b363SPhilipp Reisner drbd_uuid_set_bm(mdev, 0UL); 2553b411b363SPhilipp Reisner 2554b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2555b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2556b411b363SPhilipp Reisner *rule_nr = 34; 2557b411b363SPhilipp Reisner } else { 2558b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n"); 2559b411b363SPhilipp Reisner *rule_nr = 36; 2560b411b363SPhilipp Reisner } 2561b411b363SPhilipp Reisner 2562b411b363SPhilipp Reisner return 1; 2563b411b363SPhilipp Reisner } 2564b411b363SPhilipp Reisner 2565b411b363SPhilipp Reisner if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) { 2566b411b363SPhilipp Reisner 256731890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 25684a23f264SPhilipp Reisner return -1091; 2569b411b363SPhilipp Reisner 2570b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) && 2571b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) { 2572b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); 2573b411b363SPhilipp Reisner 2574b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START]; 2575b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP]; 2576b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = 0UL; 2577b411b363SPhilipp Reisner 2578b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2579b411b363SPhilipp Reisner *rule_nr = 35; 2580b411b363SPhilipp Reisner } else { 2581b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n"); 2582b411b363SPhilipp Reisner *rule_nr = 37; 2583b411b363SPhilipp Reisner } 2584b411b363SPhilipp Reisner 2585b411b363SPhilipp Reisner return -1; 2586b411b363SPhilipp Reisner } 2587b411b363SPhilipp Reisner 2588b411b363SPhilipp Reisner /* Common power [off|failure] */ 2589b411b363SPhilipp Reisner rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) + 2590b411b363SPhilipp Reisner (mdev->p_uuid[UI_FLAGS] & 2); 2591b411b363SPhilipp Reisner /* lowest bit is set when we were primary, 2592b411b363SPhilipp Reisner * next bit (weight 2) is set when peer was primary */ 2593b411b363SPhilipp Reisner *rule_nr = 40; 2594b411b363SPhilipp Reisner 2595b411b363SPhilipp Reisner switch (rct) { 2596b411b363SPhilipp Reisner case 0: /* !self_pri && !peer_pri */ return 0; 2597b411b363SPhilipp Reisner case 1: /* self_pri && !peer_pri */ return 1; 2598b411b363SPhilipp Reisner case 2: /* !self_pri && peer_pri */ return -1; 2599b411b363SPhilipp Reisner case 3: /* self_pri && peer_pri */ 260025703f83SPhilipp Reisner dc = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags); 2601b411b363SPhilipp Reisner return dc ? -1 : 1; 2602b411b363SPhilipp Reisner } 2603b411b363SPhilipp Reisner } 2604b411b363SPhilipp Reisner 2605b411b363SPhilipp Reisner *rule_nr = 50; 2606b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2607b411b363SPhilipp Reisner if (self == peer) 2608b411b363SPhilipp Reisner return -1; 2609b411b363SPhilipp Reisner 2610b411b363SPhilipp Reisner *rule_nr = 51; 2611b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); 2612b411b363SPhilipp Reisner if (self == peer) { 261331890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 96 ? 26144a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == 26154a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) : 26164a23f264SPhilipp Reisner peer + UUID_NEW_BM_OFFSET == (mdev->p_uuid[UI_BITMAP] & ~((u64)1))) { 2617b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2618b411b363SPhilipp Reisner resync as sync source modifications of the peer's UUIDs. */ 2619b411b363SPhilipp Reisner 262031890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 26214a23f264SPhilipp Reisner return -1091; 2622b411b363SPhilipp Reisner 2623b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START]; 2624b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1]; 26254a23f264SPhilipp Reisner 26264a23f264SPhilipp Reisner dev_info(DEV, "Did not got last syncUUID packet, corrected:\n"); 26274a23f264SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 26284a23f264SPhilipp Reisner 2629b411b363SPhilipp Reisner return -1; 2630b411b363SPhilipp Reisner } 2631b411b363SPhilipp Reisner } 2632b411b363SPhilipp Reisner 2633b411b363SPhilipp Reisner *rule_nr = 60; 2634b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2635b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2636b411b363SPhilipp Reisner peer = mdev->p_uuid[i] & ~((u64)1); 2637b411b363SPhilipp Reisner if (self == peer) 2638b411b363SPhilipp Reisner return -2; 2639b411b363SPhilipp Reisner } 2640b411b363SPhilipp Reisner 2641b411b363SPhilipp Reisner *rule_nr = 70; 2642b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2643b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2644b411b363SPhilipp Reisner if (self == peer) 2645b411b363SPhilipp Reisner return 1; 2646b411b363SPhilipp Reisner 2647b411b363SPhilipp Reisner *rule_nr = 71; 2648b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); 2649b411b363SPhilipp Reisner if (self == peer) { 265031890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 96 ? 26514a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == 26524a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) : 26534a23f264SPhilipp Reisner self + UUID_NEW_BM_OFFSET == (mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) { 2654b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2655b411b363SPhilipp Reisner resync as sync source modifications of our UUIDs. */ 2656b411b363SPhilipp Reisner 265731890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 26584a23f264SPhilipp Reisner return -1091; 2659b411b363SPhilipp Reisner 2660b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]); 2661b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]); 2662b411b363SPhilipp Reisner 26634a23f264SPhilipp Reisner dev_info(DEV, "Last syncUUID did not get through, corrected:\n"); 2664b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2665b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2666b411b363SPhilipp Reisner 2667b411b363SPhilipp Reisner return 1; 2668b411b363SPhilipp Reisner } 2669b411b363SPhilipp Reisner } 2670b411b363SPhilipp Reisner 2671b411b363SPhilipp Reisner 2672b411b363SPhilipp Reisner *rule_nr = 80; 2673d8c2a36bSPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2674b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2675b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2676b411b363SPhilipp Reisner if (self == peer) 2677b411b363SPhilipp Reisner return 2; 2678b411b363SPhilipp Reisner } 2679b411b363SPhilipp Reisner 2680b411b363SPhilipp Reisner *rule_nr = 90; 2681b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2682b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2683b411b363SPhilipp Reisner if (self == peer && self != ((u64)0)) 2684b411b363SPhilipp Reisner return 100; 2685b411b363SPhilipp Reisner 2686b411b363SPhilipp Reisner *rule_nr = 100; 2687b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2688b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2689b411b363SPhilipp Reisner for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { 2690b411b363SPhilipp Reisner peer = mdev->p_uuid[j] & ~((u64)1); 2691b411b363SPhilipp Reisner if (self == peer) 2692b411b363SPhilipp Reisner return -100; 2693b411b363SPhilipp Reisner } 2694b411b363SPhilipp Reisner } 2695b411b363SPhilipp Reisner 2696b411b363SPhilipp Reisner return -1000; 2697b411b363SPhilipp Reisner } 2698b411b363SPhilipp Reisner 2699b411b363SPhilipp Reisner /* drbd_sync_handshake() returns the new conn state on success, or 2700b411b363SPhilipp Reisner CONN_MASK (-1) on failure. 2701b411b363SPhilipp Reisner */ 2702b411b363SPhilipp Reisner static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role, 2703b411b363SPhilipp Reisner enum drbd_disk_state peer_disk) __must_hold(local) 2704b411b363SPhilipp Reisner { 2705b411b363SPhilipp Reisner int hg, rule_nr; 2706b411b363SPhilipp Reisner enum drbd_conns rv = C_MASK; 2707b411b363SPhilipp Reisner enum drbd_disk_state mydisk; 2708b411b363SPhilipp Reisner 2709b411b363SPhilipp Reisner mydisk = mdev->state.disk; 2710b411b363SPhilipp Reisner if (mydisk == D_NEGOTIATING) 2711b411b363SPhilipp Reisner mydisk = mdev->new_state_tmp.disk; 2712b411b363SPhilipp Reisner 2713b411b363SPhilipp Reisner dev_info(DEV, "drbd_sync_handshake:\n"); 2714b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0); 2715b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, 2716b411b363SPhilipp Reisner mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2717b411b363SPhilipp Reisner 2718b411b363SPhilipp Reisner hg = drbd_uuid_compare(mdev, &rule_nr); 2719b411b363SPhilipp Reisner 2720b411b363SPhilipp Reisner dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr); 2721b411b363SPhilipp Reisner 2722b411b363SPhilipp Reisner if (hg == -1000) { 2723b411b363SPhilipp Reisner dev_alert(DEV, "Unrelated data, aborting!\n"); 2724b411b363SPhilipp Reisner return C_MASK; 2725b411b363SPhilipp Reisner } 27264a23f264SPhilipp Reisner if (hg < -1000) { 27274a23f264SPhilipp Reisner dev_alert(DEV, "To resolve this both sides have to support at least protocol %d\n", -hg - 1000); 2728b411b363SPhilipp Reisner return C_MASK; 2729b411b363SPhilipp Reisner } 2730b411b363SPhilipp Reisner 2731b411b363SPhilipp Reisner if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || 2732b411b363SPhilipp Reisner (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { 2733b411b363SPhilipp Reisner int f = (hg == -100) || abs(hg) == 2; 2734b411b363SPhilipp Reisner hg = mydisk > D_INCONSISTENT ? 1 : -1; 2735b411b363SPhilipp Reisner if (f) 2736b411b363SPhilipp Reisner hg = hg*2; 2737b411b363SPhilipp Reisner dev_info(DEV, "Becoming sync %s due to disk states.\n", 2738b411b363SPhilipp Reisner hg > 0 ? "source" : "target"); 2739b411b363SPhilipp Reisner } 2740b411b363SPhilipp Reisner 27413a11a487SAdam Gandelman if (abs(hg) == 100) 27423a11a487SAdam Gandelman drbd_khelper(mdev, "initial-split-brain"); 27433a11a487SAdam Gandelman 274489e58e75SPhilipp Reisner if (hg == 100 || (hg == -100 && mdev->tconn->net_conf->always_asbp)) { 2745b411b363SPhilipp Reisner int pcount = (mdev->state.role == R_PRIMARY) 2746b411b363SPhilipp Reisner + (peer_role == R_PRIMARY); 2747b411b363SPhilipp Reisner int forced = (hg == -100); 2748b411b363SPhilipp Reisner 2749b411b363SPhilipp Reisner switch (pcount) { 2750b411b363SPhilipp Reisner case 0: 2751b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2752b411b363SPhilipp Reisner break; 2753b411b363SPhilipp Reisner case 1: 2754b411b363SPhilipp Reisner hg = drbd_asb_recover_1p(mdev); 2755b411b363SPhilipp Reisner break; 2756b411b363SPhilipp Reisner case 2: 2757b411b363SPhilipp Reisner hg = drbd_asb_recover_2p(mdev); 2758b411b363SPhilipp Reisner break; 2759b411b363SPhilipp Reisner } 2760b411b363SPhilipp Reisner if (abs(hg) < 100) { 2761b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, %d primaries, " 2762b411b363SPhilipp Reisner "automatically solved. Sync from %s node\n", 2763b411b363SPhilipp Reisner pcount, (hg < 0) ? "peer" : "this"); 2764b411b363SPhilipp Reisner if (forced) { 2765b411b363SPhilipp Reisner dev_warn(DEV, "Doing a full sync, since" 2766b411b363SPhilipp Reisner " UUIDs where ambiguous.\n"); 2767b411b363SPhilipp Reisner hg = hg*2; 2768b411b363SPhilipp Reisner } 2769b411b363SPhilipp Reisner } 2770b411b363SPhilipp Reisner } 2771b411b363SPhilipp Reisner 2772b411b363SPhilipp Reisner if (hg == -100) { 277389e58e75SPhilipp Reisner if (mdev->tconn->net_conf->want_lose && !(mdev->p_uuid[UI_FLAGS]&1)) 2774b411b363SPhilipp Reisner hg = -1; 277589e58e75SPhilipp Reisner if (!mdev->tconn->net_conf->want_lose && (mdev->p_uuid[UI_FLAGS]&1)) 2776b411b363SPhilipp Reisner hg = 1; 2777b411b363SPhilipp Reisner 2778b411b363SPhilipp Reisner if (abs(hg) < 100) 2779b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, manually solved. " 2780b411b363SPhilipp Reisner "Sync from %s node\n", 2781b411b363SPhilipp Reisner (hg < 0) ? "peer" : "this"); 2782b411b363SPhilipp Reisner } 2783b411b363SPhilipp Reisner 2784b411b363SPhilipp Reisner if (hg == -100) { 2785580b9767SLars Ellenberg /* FIXME this log message is not correct if we end up here 2786580b9767SLars Ellenberg * after an attempted attach on a diskless node. 2787580b9767SLars Ellenberg * We just refuse to attach -- well, we drop the "connection" 2788580b9767SLars Ellenberg * to that disk, in a way... */ 27893a11a487SAdam Gandelman dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n"); 2790b411b363SPhilipp Reisner drbd_khelper(mdev, "split-brain"); 2791b411b363SPhilipp Reisner return C_MASK; 2792b411b363SPhilipp Reisner } 2793b411b363SPhilipp Reisner 2794b411b363SPhilipp Reisner if (hg > 0 && mydisk <= D_INCONSISTENT) { 2795b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n"); 2796b411b363SPhilipp Reisner return C_MASK; 2797b411b363SPhilipp Reisner } 2798b411b363SPhilipp Reisner 2799b411b363SPhilipp Reisner if (hg < 0 && /* by intention we do not use mydisk here. */ 2800b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) { 280189e58e75SPhilipp Reisner switch (mdev->tconn->net_conf->rr_conflict) { 2802b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2803b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost"); 2804b411b363SPhilipp Reisner /* fall through */ 2805b411b363SPhilipp Reisner case ASB_DISCONNECT: 2806b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncTarget, but I am primary!\n"); 2807b411b363SPhilipp Reisner return C_MASK; 2808b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2809b411b363SPhilipp Reisner dev_warn(DEV, "Becoming SyncTarget, violating the stable-data" 2810b411b363SPhilipp Reisner "assumption\n"); 2811b411b363SPhilipp Reisner } 2812b411b363SPhilipp Reisner } 2813b411b363SPhilipp Reisner 28148169e41bSPhilipp Reisner if (mdev->tconn->net_conf->dry_run || test_bit(CONN_DRY_RUN, &mdev->tconn->flags)) { 2815cf14c2e9SPhilipp Reisner if (hg == 0) 2816cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n"); 2817cf14c2e9SPhilipp Reisner else 2818cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.", 2819cf14c2e9SPhilipp Reisner drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), 2820cf14c2e9SPhilipp Reisner abs(hg) >= 2 ? "full" : "bit-map based"); 2821cf14c2e9SPhilipp Reisner return C_MASK; 2822cf14c2e9SPhilipp Reisner } 2823cf14c2e9SPhilipp Reisner 2824b411b363SPhilipp Reisner if (abs(hg) >= 2) { 2825b411b363SPhilipp Reisner dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); 282620ceb2b2SLars Ellenberg if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake", 282720ceb2b2SLars Ellenberg BM_LOCKED_SET_ALLOWED)) 2828b411b363SPhilipp Reisner return C_MASK; 2829b411b363SPhilipp Reisner } 2830b411b363SPhilipp Reisner 2831b411b363SPhilipp Reisner if (hg > 0) { /* become sync source. */ 2832b411b363SPhilipp Reisner rv = C_WF_BITMAP_S; 2833b411b363SPhilipp Reisner } else if (hg < 0) { /* become sync target */ 2834b411b363SPhilipp Reisner rv = C_WF_BITMAP_T; 2835b411b363SPhilipp Reisner } else { 2836b411b363SPhilipp Reisner rv = C_CONNECTED; 2837b411b363SPhilipp Reisner if (drbd_bm_total_weight(mdev)) { 2838b411b363SPhilipp Reisner dev_info(DEV, "No resync, but %lu bits in bitmap!\n", 2839b411b363SPhilipp Reisner drbd_bm_total_weight(mdev)); 2840b411b363SPhilipp Reisner } 2841b411b363SPhilipp Reisner } 2842b411b363SPhilipp Reisner 2843b411b363SPhilipp Reisner return rv; 2844b411b363SPhilipp Reisner } 2845b411b363SPhilipp Reisner 2846b411b363SPhilipp Reisner /* returns 1 if invalid */ 2847b411b363SPhilipp Reisner static int cmp_after_sb(enum drbd_after_sb_p peer, enum drbd_after_sb_p self) 2848b411b363SPhilipp Reisner { 2849b411b363SPhilipp Reisner /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ 2850b411b363SPhilipp Reisner if ((peer == ASB_DISCARD_REMOTE && self == ASB_DISCARD_LOCAL) || 2851b411b363SPhilipp Reisner (self == ASB_DISCARD_REMOTE && peer == ASB_DISCARD_LOCAL)) 2852b411b363SPhilipp Reisner return 0; 2853b411b363SPhilipp Reisner 2854b411b363SPhilipp Reisner /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ 2855b411b363SPhilipp Reisner if (peer == ASB_DISCARD_REMOTE || peer == ASB_DISCARD_LOCAL || 2856b411b363SPhilipp Reisner self == ASB_DISCARD_REMOTE || self == ASB_DISCARD_LOCAL) 2857b411b363SPhilipp Reisner return 1; 2858b411b363SPhilipp Reisner 2859b411b363SPhilipp Reisner /* everything else is valid if they are equal on both sides. */ 2860b411b363SPhilipp Reisner if (peer == self) 2861b411b363SPhilipp Reisner return 0; 2862b411b363SPhilipp Reisner 2863b411b363SPhilipp Reisner /* everything es is invalid. */ 2864b411b363SPhilipp Reisner return 1; 2865b411b363SPhilipp Reisner } 2866b411b363SPhilipp Reisner 28677204624cSPhilipp Reisner static int receive_protocol(struct drbd_tconn *tconn, enum drbd_packet cmd, 2868d8763023SAndreas Gruenbacher unsigned int data_size) 2869b411b363SPhilipp Reisner { 28707204624cSPhilipp Reisner struct p_protocol *p = &tconn->data.rbuf.protocol; 2871b411b363SPhilipp Reisner int p_proto, p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; 2872cf14c2e9SPhilipp Reisner int p_want_lose, p_two_primaries, cf; 2873b411b363SPhilipp Reisner char p_integrity_alg[SHARED_SECRET_MAX] = ""; 2874b411b363SPhilipp Reisner 2875b411b363SPhilipp Reisner p_proto = be32_to_cpu(p->protocol); 2876b411b363SPhilipp Reisner p_after_sb_0p = be32_to_cpu(p->after_sb_0p); 2877b411b363SPhilipp Reisner p_after_sb_1p = be32_to_cpu(p->after_sb_1p); 2878b411b363SPhilipp Reisner p_after_sb_2p = be32_to_cpu(p->after_sb_2p); 2879b411b363SPhilipp Reisner p_two_primaries = be32_to_cpu(p->two_primaries); 2880cf14c2e9SPhilipp Reisner cf = be32_to_cpu(p->conn_flags); 2881cf14c2e9SPhilipp Reisner p_want_lose = cf & CF_WANT_LOSE; 2882cf14c2e9SPhilipp Reisner 28837204624cSPhilipp Reisner clear_bit(CONN_DRY_RUN, &tconn->flags); 2884cf14c2e9SPhilipp Reisner 2885cf14c2e9SPhilipp Reisner if (cf & CF_DRY_RUN) 28867204624cSPhilipp Reisner set_bit(CONN_DRY_RUN, &tconn->flags); 2887b411b363SPhilipp Reisner 28887204624cSPhilipp Reisner if (p_proto != tconn->net_conf->wire_protocol) { 28897204624cSPhilipp Reisner conn_err(tconn, "incompatible communication protocols\n"); 2890b411b363SPhilipp Reisner goto disconnect; 2891b411b363SPhilipp Reisner } 2892b411b363SPhilipp Reisner 28937204624cSPhilipp Reisner if (cmp_after_sb(p_after_sb_0p, tconn->net_conf->after_sb_0p)) { 28947204624cSPhilipp Reisner conn_err(tconn, "incompatible after-sb-0pri settings\n"); 2895b411b363SPhilipp Reisner goto disconnect; 2896b411b363SPhilipp Reisner } 2897b411b363SPhilipp Reisner 28987204624cSPhilipp Reisner if (cmp_after_sb(p_after_sb_1p, tconn->net_conf->after_sb_1p)) { 28997204624cSPhilipp Reisner conn_err(tconn, "incompatible after-sb-1pri settings\n"); 2900b411b363SPhilipp Reisner goto disconnect; 2901b411b363SPhilipp Reisner } 2902b411b363SPhilipp Reisner 29037204624cSPhilipp Reisner if (cmp_after_sb(p_after_sb_2p, tconn->net_conf->after_sb_2p)) { 29047204624cSPhilipp Reisner conn_err(tconn, "incompatible after-sb-2pri settings\n"); 2905b411b363SPhilipp Reisner goto disconnect; 2906b411b363SPhilipp Reisner } 2907b411b363SPhilipp Reisner 29087204624cSPhilipp Reisner if (p_want_lose && tconn->net_conf->want_lose) { 29097204624cSPhilipp Reisner conn_err(tconn, "both sides have the 'want_lose' flag set\n"); 2910b411b363SPhilipp Reisner goto disconnect; 2911b411b363SPhilipp Reisner } 2912b411b363SPhilipp Reisner 29137204624cSPhilipp Reisner if (p_two_primaries != tconn->net_conf->two_primaries) { 29147204624cSPhilipp Reisner conn_err(tconn, "incompatible setting of the two-primaries options\n"); 2915b411b363SPhilipp Reisner goto disconnect; 2916b411b363SPhilipp Reisner } 2917b411b363SPhilipp Reisner 29187204624cSPhilipp Reisner if (tconn->agreed_pro_version >= 87) { 29197204624cSPhilipp Reisner unsigned char *my_alg = tconn->net_conf->integrity_alg; 2920b411b363SPhilipp Reisner 29217204624cSPhilipp Reisner if (drbd_recv(tconn, p_integrity_alg, data_size) != data_size) 292281e84650SAndreas Gruenbacher return false; 2923b411b363SPhilipp Reisner 2924b411b363SPhilipp Reisner p_integrity_alg[SHARED_SECRET_MAX-1] = 0; 2925b411b363SPhilipp Reisner if (strcmp(p_integrity_alg, my_alg)) { 29267204624cSPhilipp Reisner conn_err(tconn, "incompatible setting of the data-integrity-alg\n"); 2927b411b363SPhilipp Reisner goto disconnect; 2928b411b363SPhilipp Reisner } 29297204624cSPhilipp Reisner conn_info(tconn, "data-integrity-alg: %s\n", 2930b411b363SPhilipp Reisner my_alg[0] ? my_alg : (unsigned char *)"<not-used>"); 2931b411b363SPhilipp Reisner } 2932b411b363SPhilipp Reisner 293381e84650SAndreas Gruenbacher return true; 2934b411b363SPhilipp Reisner 2935b411b363SPhilipp Reisner disconnect: 29367204624cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 293781e84650SAndreas Gruenbacher return false; 2938b411b363SPhilipp Reisner } 2939b411b363SPhilipp Reisner 2940b411b363SPhilipp Reisner /* helper function 2941b411b363SPhilipp Reisner * input: alg name, feature name 2942b411b363SPhilipp Reisner * return: NULL (alg name was "") 2943b411b363SPhilipp Reisner * ERR_PTR(error) if something goes wrong 2944b411b363SPhilipp Reisner * or the crypto hash ptr, if it worked out ok. */ 2945b411b363SPhilipp Reisner struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev, 2946b411b363SPhilipp Reisner const char *alg, const char *name) 2947b411b363SPhilipp Reisner { 2948b411b363SPhilipp Reisner struct crypto_hash *tfm; 2949b411b363SPhilipp Reisner 2950b411b363SPhilipp Reisner if (!alg[0]) 2951b411b363SPhilipp Reisner return NULL; 2952b411b363SPhilipp Reisner 2953b411b363SPhilipp Reisner tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC); 2954b411b363SPhilipp Reisner if (IS_ERR(tfm)) { 2955b411b363SPhilipp Reisner dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n", 2956b411b363SPhilipp Reisner alg, name, PTR_ERR(tfm)); 2957b411b363SPhilipp Reisner return tfm; 2958b411b363SPhilipp Reisner } 2959b411b363SPhilipp Reisner if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) { 2960b411b363SPhilipp Reisner crypto_free_hash(tfm); 2961b411b363SPhilipp Reisner dev_err(DEV, "\"%s\" is not a digest (%s)\n", alg, name); 2962b411b363SPhilipp Reisner return ERR_PTR(-EINVAL); 2963b411b363SPhilipp Reisner } 2964b411b363SPhilipp Reisner return tfm; 2965b411b363SPhilipp Reisner } 2966b411b363SPhilipp Reisner 2967d8763023SAndreas Gruenbacher static int receive_SyncParam(struct drbd_conf *mdev, enum drbd_packet cmd, 2968d8763023SAndreas Gruenbacher unsigned int packet_size) 2969b411b363SPhilipp Reisner { 297081e84650SAndreas Gruenbacher int ok = true; 2971e42325a5SPhilipp Reisner struct p_rs_param_95 *p = &mdev->tconn->data.rbuf.rs_param_95; 2972b411b363SPhilipp Reisner unsigned int header_size, data_size, exp_max_sz; 2973b411b363SPhilipp Reisner struct crypto_hash *verify_tfm = NULL; 2974b411b363SPhilipp Reisner struct crypto_hash *csums_tfm = NULL; 297531890f4aSPhilipp Reisner const int apv = mdev->tconn->agreed_pro_version; 2976778f271dSPhilipp Reisner int *rs_plan_s = NULL; 2977778f271dSPhilipp Reisner int fifo_size = 0; 2978b411b363SPhilipp Reisner 2979b411b363SPhilipp Reisner exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) 2980b411b363SPhilipp Reisner : apv == 88 ? sizeof(struct p_rs_param) 2981b411b363SPhilipp Reisner + SHARED_SECRET_MAX 29828e26f9ccSPhilipp Reisner : apv <= 94 ? sizeof(struct p_rs_param_89) 29838e26f9ccSPhilipp Reisner : /* apv >= 95 */ sizeof(struct p_rs_param_95); 2984b411b363SPhilipp Reisner 298502918be2SPhilipp Reisner if (packet_size > exp_max_sz) { 2986b411b363SPhilipp Reisner dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n", 298702918be2SPhilipp Reisner packet_size, exp_max_sz); 298881e84650SAndreas Gruenbacher return false; 2989b411b363SPhilipp Reisner } 2990b411b363SPhilipp Reisner 2991b411b363SPhilipp Reisner if (apv <= 88) { 2992257d0af6SPhilipp Reisner header_size = sizeof(struct p_rs_param) - sizeof(struct p_header); 299302918be2SPhilipp Reisner data_size = packet_size - header_size; 29948e26f9ccSPhilipp Reisner } else if (apv <= 94) { 2995257d0af6SPhilipp Reisner header_size = sizeof(struct p_rs_param_89) - sizeof(struct p_header); 299602918be2SPhilipp Reisner data_size = packet_size - header_size; 2997b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 29988e26f9ccSPhilipp Reisner } else { 2999257d0af6SPhilipp Reisner header_size = sizeof(struct p_rs_param_95) - sizeof(struct p_header); 300002918be2SPhilipp Reisner data_size = packet_size - header_size; 3001b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 3002b411b363SPhilipp Reisner } 3003b411b363SPhilipp Reisner 3004b411b363SPhilipp Reisner /* initialize verify_alg and csums_alg */ 3005b411b363SPhilipp Reisner memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); 3006b411b363SPhilipp Reisner 3007de0ff338SPhilipp Reisner if (drbd_recv(mdev->tconn, &p->head.payload, header_size) != header_size) 300881e84650SAndreas Gruenbacher return false; 3009b411b363SPhilipp Reisner 3010f399002eSLars Ellenberg if (get_ldev(mdev)) { 3011f399002eSLars Ellenberg mdev->ldev->dc.resync_rate = be32_to_cpu(p->rate); 3012f399002eSLars Ellenberg put_ldev(mdev); 3013f399002eSLars Ellenberg } 3014b411b363SPhilipp Reisner 3015b411b363SPhilipp Reisner if (apv >= 88) { 3016b411b363SPhilipp Reisner if (apv == 88) { 3017b411b363SPhilipp Reisner if (data_size > SHARED_SECRET_MAX) { 3018b411b363SPhilipp Reisner dev_err(DEV, "verify-alg too long, " 3019b411b363SPhilipp Reisner "peer wants %u, accepting only %u byte\n", 3020b411b363SPhilipp Reisner data_size, SHARED_SECRET_MAX); 302181e84650SAndreas Gruenbacher return false; 3022b411b363SPhilipp Reisner } 3023b411b363SPhilipp Reisner 3024de0ff338SPhilipp Reisner if (drbd_recv(mdev->tconn, p->verify_alg, data_size) != data_size) 302581e84650SAndreas Gruenbacher return false; 3026b411b363SPhilipp Reisner 3027b411b363SPhilipp Reisner /* we expect NUL terminated string */ 3028b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 3029b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[data_size-1] == 0); 3030b411b363SPhilipp Reisner p->verify_alg[data_size-1] = 0; 3031b411b363SPhilipp Reisner 3032b411b363SPhilipp Reisner } else /* apv >= 89 */ { 3033b411b363SPhilipp Reisner /* we still expect NUL terminated strings */ 3034b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 3035b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0); 3036b411b363SPhilipp Reisner D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0); 3037b411b363SPhilipp Reisner p->verify_alg[SHARED_SECRET_MAX-1] = 0; 3038b411b363SPhilipp Reisner p->csums_alg[SHARED_SECRET_MAX-1] = 0; 3039b411b363SPhilipp Reisner } 3040b411b363SPhilipp Reisner 3041f399002eSLars Ellenberg if (strcmp(mdev->tconn->net_conf->verify_alg, p->verify_alg)) { 3042b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 3043b411b363SPhilipp Reisner dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", 3044f399002eSLars Ellenberg mdev->tconn->net_conf->verify_alg, p->verify_alg); 3045b411b363SPhilipp Reisner goto disconnect; 3046b411b363SPhilipp Reisner } 3047b411b363SPhilipp Reisner verify_tfm = drbd_crypto_alloc_digest_safe(mdev, 3048b411b363SPhilipp Reisner p->verify_alg, "verify-alg"); 3049b411b363SPhilipp Reisner if (IS_ERR(verify_tfm)) { 3050b411b363SPhilipp Reisner verify_tfm = NULL; 3051b411b363SPhilipp Reisner goto disconnect; 3052b411b363SPhilipp Reisner } 3053b411b363SPhilipp Reisner } 3054b411b363SPhilipp Reisner 3055f399002eSLars Ellenberg if (apv >= 89 && strcmp(mdev->tconn->net_conf->csums_alg, p->csums_alg)) { 3056b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 3057b411b363SPhilipp Reisner dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", 3058f399002eSLars Ellenberg mdev->tconn->net_conf->csums_alg, p->csums_alg); 3059b411b363SPhilipp Reisner goto disconnect; 3060b411b363SPhilipp Reisner } 3061b411b363SPhilipp Reisner csums_tfm = drbd_crypto_alloc_digest_safe(mdev, 3062b411b363SPhilipp Reisner p->csums_alg, "csums-alg"); 3063b411b363SPhilipp Reisner if (IS_ERR(csums_tfm)) { 3064b411b363SPhilipp Reisner csums_tfm = NULL; 3065b411b363SPhilipp Reisner goto disconnect; 3066b411b363SPhilipp Reisner } 3067b411b363SPhilipp Reisner } 3068b411b363SPhilipp Reisner 3069f399002eSLars Ellenberg if (apv > 94 && get_ldev(mdev)) { 3070f399002eSLars Ellenberg mdev->ldev->dc.resync_rate = be32_to_cpu(p->rate); 3071f399002eSLars Ellenberg mdev->ldev->dc.c_plan_ahead = be32_to_cpu(p->c_plan_ahead); 3072f399002eSLars Ellenberg mdev->ldev->dc.c_delay_target = be32_to_cpu(p->c_delay_target); 3073f399002eSLars Ellenberg mdev->ldev->dc.c_fill_target = be32_to_cpu(p->c_fill_target); 3074f399002eSLars Ellenberg mdev->ldev->dc.c_max_rate = be32_to_cpu(p->c_max_rate); 3075778f271dSPhilipp Reisner 3076f399002eSLars Ellenberg fifo_size = (mdev->ldev->dc.c_plan_ahead * 10 * SLEEP_TIME) / HZ; 3077778f271dSPhilipp Reisner if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) { 3078778f271dSPhilipp Reisner rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL); 3079778f271dSPhilipp Reisner if (!rs_plan_s) { 3080778f271dSPhilipp Reisner dev_err(DEV, "kmalloc of fifo_buffer failed"); 3081f399002eSLars Ellenberg put_ldev(mdev); 3082778f271dSPhilipp Reisner goto disconnect; 3083778f271dSPhilipp Reisner } 3084778f271dSPhilipp Reisner } 3085f399002eSLars Ellenberg put_ldev(mdev); 30868e26f9ccSPhilipp Reisner } 3087b411b363SPhilipp Reisner 3088b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 3089b411b363SPhilipp Reisner /* lock against drbd_nl_syncer_conf() */ 3090b411b363SPhilipp Reisner if (verify_tfm) { 3091f399002eSLars Ellenberg strcpy(mdev->tconn->net_conf->verify_alg, p->verify_alg); 3092f399002eSLars Ellenberg mdev->tconn->net_conf->verify_alg_len = strlen(p->verify_alg) + 1; 3093f399002eSLars Ellenberg crypto_free_hash(mdev->tconn->verify_tfm); 3094f399002eSLars Ellenberg mdev->tconn->verify_tfm = verify_tfm; 3095b411b363SPhilipp Reisner dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg); 3096b411b363SPhilipp Reisner } 3097b411b363SPhilipp Reisner if (csums_tfm) { 3098f399002eSLars Ellenberg strcpy(mdev->tconn->net_conf->csums_alg, p->csums_alg); 3099f399002eSLars Ellenberg mdev->tconn->net_conf->csums_alg_len = strlen(p->csums_alg) + 1; 3100f399002eSLars Ellenberg crypto_free_hash(mdev->tconn->csums_tfm); 3101f399002eSLars Ellenberg mdev->tconn->csums_tfm = csums_tfm; 3102b411b363SPhilipp Reisner dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg); 3103b411b363SPhilipp Reisner } 3104778f271dSPhilipp Reisner if (fifo_size != mdev->rs_plan_s.size) { 3105778f271dSPhilipp Reisner kfree(mdev->rs_plan_s.values); 3106778f271dSPhilipp Reisner mdev->rs_plan_s.values = rs_plan_s; 3107778f271dSPhilipp Reisner mdev->rs_plan_s.size = fifo_size; 3108778f271dSPhilipp Reisner mdev->rs_planed = 0; 3109778f271dSPhilipp Reisner } 3110b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 3111b411b363SPhilipp Reisner } 3112b411b363SPhilipp Reisner 3113b411b363SPhilipp Reisner return ok; 3114b411b363SPhilipp Reisner disconnect: 3115b411b363SPhilipp Reisner /* just for completeness: actually not needed, 3116b411b363SPhilipp Reisner * as this is not reached if csums_tfm was ok. */ 3117b411b363SPhilipp Reisner crypto_free_hash(csums_tfm); 3118b411b363SPhilipp Reisner /* but free the verify_tfm again, if csums_tfm did not work out */ 3119b411b363SPhilipp Reisner crypto_free_hash(verify_tfm); 312038fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 312181e84650SAndreas Gruenbacher return false; 3122b411b363SPhilipp Reisner } 3123b411b363SPhilipp Reisner 3124b411b363SPhilipp Reisner /* warn if the arguments differ by more than 12.5% */ 3125b411b363SPhilipp Reisner static void warn_if_differ_considerably(struct drbd_conf *mdev, 3126b411b363SPhilipp Reisner const char *s, sector_t a, sector_t b) 3127b411b363SPhilipp Reisner { 3128b411b363SPhilipp Reisner sector_t d; 3129b411b363SPhilipp Reisner if (a == 0 || b == 0) 3130b411b363SPhilipp Reisner return; 3131b411b363SPhilipp Reisner d = (a > b) ? (a - b) : (b - a); 3132b411b363SPhilipp Reisner if (d > (a>>3) || d > (b>>3)) 3133b411b363SPhilipp Reisner dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s, 3134b411b363SPhilipp Reisner (unsigned long long)a, (unsigned long long)b); 3135b411b363SPhilipp Reisner } 3136b411b363SPhilipp Reisner 3137d8763023SAndreas Gruenbacher static int receive_sizes(struct drbd_conf *mdev, enum drbd_packet cmd, 3138d8763023SAndreas Gruenbacher unsigned int data_size) 3139b411b363SPhilipp Reisner { 3140e42325a5SPhilipp Reisner struct p_sizes *p = &mdev->tconn->data.rbuf.sizes; 3141b411b363SPhilipp Reisner enum determine_dev_size dd = unchanged; 3142b411b363SPhilipp Reisner sector_t p_size, p_usize, my_usize; 3143b411b363SPhilipp Reisner int ldsc = 0; /* local disk size changed */ 3144e89b591cSPhilipp Reisner enum dds_flags ddsf; 3145b411b363SPhilipp Reisner 3146b411b363SPhilipp Reisner p_size = be64_to_cpu(p->d_size); 3147b411b363SPhilipp Reisner p_usize = be64_to_cpu(p->u_size); 3148b411b363SPhilipp Reisner 3149b411b363SPhilipp Reisner /* just store the peer's disk size for now. 3150b411b363SPhilipp Reisner * we still need to figure out whether we accept that. */ 3151b411b363SPhilipp Reisner mdev->p_size = p_size; 3152b411b363SPhilipp Reisner 3153b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3154b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "lower level device sizes", 3155b411b363SPhilipp Reisner p_size, drbd_get_max_capacity(mdev->ldev)); 3156b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "user requested size", 3157b411b363SPhilipp Reisner p_usize, mdev->ldev->dc.disk_size); 3158b411b363SPhilipp Reisner 3159b411b363SPhilipp Reisner /* if this is the first connect, or an otherwise expected 3160b411b363SPhilipp Reisner * param exchange, choose the minimum */ 3161b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) 3162b411b363SPhilipp Reisner p_usize = min_not_zero((sector_t)mdev->ldev->dc.disk_size, 3163b411b363SPhilipp Reisner p_usize); 3164b411b363SPhilipp Reisner 3165b411b363SPhilipp Reisner my_usize = mdev->ldev->dc.disk_size; 3166b411b363SPhilipp Reisner 3167b411b363SPhilipp Reisner if (mdev->ldev->dc.disk_size != p_usize) { 3168b411b363SPhilipp Reisner mdev->ldev->dc.disk_size = p_usize; 3169b411b363SPhilipp Reisner dev_info(DEV, "Peer sets u_size to %lu sectors\n", 3170b411b363SPhilipp Reisner (unsigned long)mdev->ldev->dc.disk_size); 3171b411b363SPhilipp Reisner } 3172b411b363SPhilipp Reisner 3173b411b363SPhilipp Reisner /* Never shrink a device with usable data during connect. 3174b411b363SPhilipp Reisner But allow online shrinking if we are connected. */ 3175a393db6fSPhilipp Reisner if (drbd_new_dev_size(mdev, mdev->ldev, 0) < 3176b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) && 3177b411b363SPhilipp Reisner mdev->state.disk >= D_OUTDATED && 3178b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED) { 3179b411b363SPhilipp Reisner dev_err(DEV, "The peer's disk size is too small!\n"); 318038fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 3181b411b363SPhilipp Reisner mdev->ldev->dc.disk_size = my_usize; 3182b411b363SPhilipp Reisner put_ldev(mdev); 318381e84650SAndreas Gruenbacher return false; 3184b411b363SPhilipp Reisner } 3185b411b363SPhilipp Reisner put_ldev(mdev); 3186b411b363SPhilipp Reisner } 3187b411b363SPhilipp Reisner 3188e89b591cSPhilipp Reisner ddsf = be16_to_cpu(p->dds_flags); 3189b411b363SPhilipp Reisner if (get_ldev(mdev)) { 319024c4830cSBart Van Assche dd = drbd_determine_dev_size(mdev, ddsf); 3191b411b363SPhilipp Reisner put_ldev(mdev); 3192b411b363SPhilipp Reisner if (dd == dev_size_error) 319381e84650SAndreas Gruenbacher return false; 3194b411b363SPhilipp Reisner drbd_md_sync(mdev); 3195b411b363SPhilipp Reisner } else { 3196b411b363SPhilipp Reisner /* I am diskless, need to accept the peer's size. */ 3197b411b363SPhilipp Reisner drbd_set_my_capacity(mdev, p_size); 3198b411b363SPhilipp Reisner } 3199b411b363SPhilipp Reisner 320099432fccSPhilipp Reisner mdev->peer_max_bio_size = be32_to_cpu(p->max_bio_size); 320199432fccSPhilipp Reisner drbd_reconsider_max_bio_size(mdev); 320299432fccSPhilipp Reisner 3203b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3204b411b363SPhilipp Reisner if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { 3205b411b363SPhilipp Reisner mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); 3206b411b363SPhilipp Reisner ldsc = 1; 3207b411b363SPhilipp Reisner } 3208b411b363SPhilipp Reisner 3209b411b363SPhilipp Reisner put_ldev(mdev); 3210b411b363SPhilipp Reisner } 3211b411b363SPhilipp Reisner 3212b411b363SPhilipp Reisner if (mdev->state.conn > C_WF_REPORT_PARAMS) { 3213b411b363SPhilipp Reisner if (be64_to_cpu(p->c_size) != 3214b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) || ldsc) { 3215b411b363SPhilipp Reisner /* we have different sizes, probably peer 3216b411b363SPhilipp Reisner * needs to know my new size... */ 3217e89b591cSPhilipp Reisner drbd_send_sizes(mdev, 0, ddsf); 3218b411b363SPhilipp Reisner } 3219b411b363SPhilipp Reisner if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) || 3220b411b363SPhilipp Reisner (dd == grew && mdev->state.conn == C_CONNECTED)) { 3221b411b363SPhilipp Reisner if (mdev->state.pdsk >= D_INCONSISTENT && 3222e89b591cSPhilipp Reisner mdev->state.disk >= D_INCONSISTENT) { 3223e89b591cSPhilipp Reisner if (ddsf & DDSF_NO_RESYNC) 3224e89b591cSPhilipp Reisner dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n"); 3225b411b363SPhilipp Reisner else 3226e89b591cSPhilipp Reisner resync_after_online_grow(mdev); 3227e89b591cSPhilipp Reisner } else 3228b411b363SPhilipp Reisner set_bit(RESYNC_AFTER_NEG, &mdev->flags); 3229b411b363SPhilipp Reisner } 3230b411b363SPhilipp Reisner } 3231b411b363SPhilipp Reisner 323281e84650SAndreas Gruenbacher return true; 3233b411b363SPhilipp Reisner } 3234b411b363SPhilipp Reisner 3235d8763023SAndreas Gruenbacher static int receive_uuids(struct drbd_conf *mdev, enum drbd_packet cmd, 3236d8763023SAndreas Gruenbacher unsigned int data_size) 3237b411b363SPhilipp Reisner { 3238e42325a5SPhilipp Reisner struct p_uuids *p = &mdev->tconn->data.rbuf.uuids; 3239b411b363SPhilipp Reisner u64 *p_uuid; 324062b0da3aSLars Ellenberg int i, updated_uuids = 0; 3241b411b363SPhilipp Reisner 3242b411b363SPhilipp Reisner p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); 3243b411b363SPhilipp Reisner 3244b411b363SPhilipp Reisner for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) 3245b411b363SPhilipp Reisner p_uuid[i] = be64_to_cpu(p->uuid[i]); 3246b411b363SPhilipp Reisner 3247b411b363SPhilipp Reisner kfree(mdev->p_uuid); 3248b411b363SPhilipp Reisner mdev->p_uuid = p_uuid; 3249b411b363SPhilipp Reisner 3250b411b363SPhilipp Reisner if (mdev->state.conn < C_CONNECTED && 3251b411b363SPhilipp Reisner mdev->state.disk < D_INCONSISTENT && 3252b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && 3253b411b363SPhilipp Reisner (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { 3254b411b363SPhilipp Reisner dev_err(DEV, "Can only connect to data with current UUID=%016llX\n", 3255b411b363SPhilipp Reisner (unsigned long long)mdev->ed_uuid); 325638fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 325781e84650SAndreas Gruenbacher return false; 3258b411b363SPhilipp Reisner } 3259b411b363SPhilipp Reisner 3260b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3261b411b363SPhilipp Reisner int skip_initial_sync = 3262b411b363SPhilipp Reisner mdev->state.conn == C_CONNECTED && 326331890f4aSPhilipp Reisner mdev->tconn->agreed_pro_version >= 90 && 3264b411b363SPhilipp Reisner mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && 3265b411b363SPhilipp Reisner (p_uuid[UI_FLAGS] & 8); 3266b411b363SPhilipp Reisner if (skip_initial_sync) { 3267b411b363SPhilipp Reisner dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n"); 3268b411b363SPhilipp Reisner drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, 326920ceb2b2SLars Ellenberg "clear_n_write from receive_uuids", 327020ceb2b2SLars Ellenberg BM_LOCKED_TEST_ALLOWED); 3271b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]); 3272b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0); 3273b411b363SPhilipp Reisner _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), 3274b411b363SPhilipp Reisner CS_VERBOSE, NULL); 3275b411b363SPhilipp Reisner drbd_md_sync(mdev); 327662b0da3aSLars Ellenberg updated_uuids = 1; 3277b411b363SPhilipp Reisner } 3278b411b363SPhilipp Reisner put_ldev(mdev); 327918a50fa2SPhilipp Reisner } else if (mdev->state.disk < D_INCONSISTENT && 328018a50fa2SPhilipp Reisner mdev->state.role == R_PRIMARY) { 328118a50fa2SPhilipp Reisner /* I am a diskless primary, the peer just created a new current UUID 328218a50fa2SPhilipp Reisner for me. */ 328362b0da3aSLars Ellenberg updated_uuids = drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 3284b411b363SPhilipp Reisner } 3285b411b363SPhilipp Reisner 3286b411b363SPhilipp Reisner /* Before we test for the disk state, we should wait until an eventually 3287b411b363SPhilipp Reisner ongoing cluster wide state change is finished. That is important if 3288b411b363SPhilipp Reisner we are primary and are detaching from our disk. We need to see the 3289b411b363SPhilipp Reisner new disk state... */ 32908410da8fSPhilipp Reisner mutex_lock(mdev->state_mutex); 32918410da8fSPhilipp Reisner mutex_unlock(mdev->state_mutex); 3292b411b363SPhilipp Reisner if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT) 329362b0da3aSLars Ellenberg updated_uuids |= drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 329462b0da3aSLars Ellenberg 329562b0da3aSLars Ellenberg if (updated_uuids) 329662b0da3aSLars Ellenberg drbd_print_uuids(mdev, "receiver updated UUIDs to"); 3297b411b363SPhilipp Reisner 329881e84650SAndreas Gruenbacher return true; 3299b411b363SPhilipp Reisner } 3300b411b363SPhilipp Reisner 3301b411b363SPhilipp Reisner /** 3302b411b363SPhilipp Reisner * convert_state() - Converts the peer's view of the cluster state to our point of view 3303b411b363SPhilipp Reisner * @ps: The state as seen by the peer. 3304b411b363SPhilipp Reisner */ 3305b411b363SPhilipp Reisner static union drbd_state convert_state(union drbd_state ps) 3306b411b363SPhilipp Reisner { 3307b411b363SPhilipp Reisner union drbd_state ms; 3308b411b363SPhilipp Reisner 3309b411b363SPhilipp Reisner static enum drbd_conns c_tab[] = { 3310b411b363SPhilipp Reisner [C_CONNECTED] = C_CONNECTED, 3311b411b363SPhilipp Reisner 3312b411b363SPhilipp Reisner [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, 3313b411b363SPhilipp Reisner [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, 3314b411b363SPhilipp Reisner [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ 3315b411b363SPhilipp Reisner [C_VERIFY_S] = C_VERIFY_T, 3316b411b363SPhilipp Reisner [C_MASK] = C_MASK, 3317b411b363SPhilipp Reisner }; 3318b411b363SPhilipp Reisner 3319b411b363SPhilipp Reisner ms.i = ps.i; 3320b411b363SPhilipp Reisner 3321b411b363SPhilipp Reisner ms.conn = c_tab[ps.conn]; 3322b411b363SPhilipp Reisner ms.peer = ps.role; 3323b411b363SPhilipp Reisner ms.role = ps.peer; 3324b411b363SPhilipp Reisner ms.pdsk = ps.disk; 3325b411b363SPhilipp Reisner ms.disk = ps.pdsk; 3326b411b363SPhilipp Reisner ms.peer_isp = (ps.aftr_isp | ps.user_isp); 3327b411b363SPhilipp Reisner 3328b411b363SPhilipp Reisner return ms; 3329b411b363SPhilipp Reisner } 3330b411b363SPhilipp Reisner 3331d8763023SAndreas Gruenbacher static int receive_req_state(struct drbd_conf *mdev, enum drbd_packet cmd, 3332d8763023SAndreas Gruenbacher unsigned int data_size) 3333b411b363SPhilipp Reisner { 3334e42325a5SPhilipp Reisner struct p_req_state *p = &mdev->tconn->data.rbuf.req_state; 3335b411b363SPhilipp Reisner union drbd_state mask, val; 3336bf885f8aSAndreas Gruenbacher enum drbd_state_rv rv; 3337b411b363SPhilipp Reisner 3338b411b363SPhilipp Reisner mask.i = be32_to_cpu(p->mask); 3339b411b363SPhilipp Reisner val.i = be32_to_cpu(p->val); 3340b411b363SPhilipp Reisner 334125703f83SPhilipp Reisner if (test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) && 33428410da8fSPhilipp Reisner mutex_is_locked(mdev->state_mutex)) { 3343b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG); 334481e84650SAndreas Gruenbacher return true; 3345b411b363SPhilipp Reisner } 3346b411b363SPhilipp Reisner 3347b411b363SPhilipp Reisner mask = convert_state(mask); 3348b411b363SPhilipp Reisner val = convert_state(val); 3349b411b363SPhilipp Reisner 3350b411b363SPhilipp Reisner rv = drbd_change_state(mdev, CS_VERBOSE, mask, val); 3351b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, rv); 3352047cd4a6SPhilipp Reisner 3353b411b363SPhilipp Reisner drbd_md_sync(mdev); 3354b411b363SPhilipp Reisner 335581e84650SAndreas Gruenbacher return true; 3356b411b363SPhilipp Reisner } 3357b411b363SPhilipp Reisner 3358dfafcc8aSPhilipp Reisner static int receive_req_conn_state(struct drbd_tconn *tconn, enum drbd_packet cmd, 3359dfafcc8aSPhilipp Reisner unsigned int data_size) 3360dfafcc8aSPhilipp Reisner { 3361dfafcc8aSPhilipp Reisner struct p_req_state *p = &tconn->data.rbuf.req_state; 3362dfafcc8aSPhilipp Reisner union drbd_state mask, val; 3363dfafcc8aSPhilipp Reisner enum drbd_state_rv rv; 3364dfafcc8aSPhilipp Reisner 3365dfafcc8aSPhilipp Reisner mask.i = be32_to_cpu(p->mask); 3366dfafcc8aSPhilipp Reisner val.i = be32_to_cpu(p->val); 3367dfafcc8aSPhilipp Reisner 3368dfafcc8aSPhilipp Reisner if (test_bit(DISCARD_CONCURRENT, &tconn->flags) && 3369dfafcc8aSPhilipp Reisner mutex_is_locked(&tconn->cstate_mutex)) { 3370dfafcc8aSPhilipp Reisner conn_send_sr_reply(tconn, SS_CONCURRENT_ST_CHG); 3371dfafcc8aSPhilipp Reisner return true; 3372dfafcc8aSPhilipp Reisner } 3373dfafcc8aSPhilipp Reisner 3374dfafcc8aSPhilipp Reisner mask = convert_state(mask); 3375dfafcc8aSPhilipp Reisner val = convert_state(val); 3376dfafcc8aSPhilipp Reisner 3377dfafcc8aSPhilipp Reisner rv = conn_request_state(tconn, mask, val, CS_VERBOSE | CS_LOCAL_ONLY); 3378dfafcc8aSPhilipp Reisner conn_send_sr_reply(tconn, rv); 3379dfafcc8aSPhilipp Reisner 3380dfafcc8aSPhilipp Reisner return true; 3381dfafcc8aSPhilipp Reisner } 3382dfafcc8aSPhilipp Reisner 3383d8763023SAndreas Gruenbacher static int receive_state(struct drbd_conf *mdev, enum drbd_packet cmd, 3384d8763023SAndreas Gruenbacher unsigned int data_size) 3385b411b363SPhilipp Reisner { 3386e42325a5SPhilipp Reisner struct p_state *p = &mdev->tconn->data.rbuf.state; 33874ac4aadaSLars Ellenberg union drbd_state os, ns, peer_state; 3388b411b363SPhilipp Reisner enum drbd_disk_state real_peer_disk; 338965d922c3SPhilipp Reisner enum chg_state_flags cs_flags; 3390b411b363SPhilipp Reisner int rv; 3391b411b363SPhilipp Reisner 3392b411b363SPhilipp Reisner peer_state.i = be32_to_cpu(p->state); 3393b411b363SPhilipp Reisner 3394b411b363SPhilipp Reisner real_peer_disk = peer_state.disk; 3395b411b363SPhilipp Reisner if (peer_state.disk == D_NEGOTIATING) { 3396b411b363SPhilipp Reisner real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; 3397b411b363SPhilipp Reisner dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); 3398b411b363SPhilipp Reisner } 3399b411b363SPhilipp Reisner 340087eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 3401b411b363SPhilipp Reisner retry: 34024ac4aadaSLars Ellenberg os = ns = mdev->state; 340387eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3404b411b363SPhilipp Reisner 3405e9ef7bb6SLars Ellenberg /* peer says his disk is uptodate, while we think it is inconsistent, 3406e9ef7bb6SLars Ellenberg * and this happens while we think we have a sync going on. */ 3407e9ef7bb6SLars Ellenberg if (os.pdsk == D_INCONSISTENT && real_peer_disk == D_UP_TO_DATE && 3408e9ef7bb6SLars Ellenberg os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { 3409e9ef7bb6SLars Ellenberg /* If we are (becoming) SyncSource, but peer is still in sync 3410e9ef7bb6SLars Ellenberg * preparation, ignore its uptodate-ness to avoid flapping, it 3411e9ef7bb6SLars Ellenberg * will change to inconsistent once the peer reaches active 3412e9ef7bb6SLars Ellenberg * syncing states. 3413e9ef7bb6SLars Ellenberg * It may have changed syncer-paused flags, however, so we 3414e9ef7bb6SLars Ellenberg * cannot ignore this completely. */ 3415e9ef7bb6SLars Ellenberg if (peer_state.conn > C_CONNECTED && 3416e9ef7bb6SLars Ellenberg peer_state.conn < C_SYNC_SOURCE) 3417e9ef7bb6SLars Ellenberg real_peer_disk = D_INCONSISTENT; 3418e9ef7bb6SLars Ellenberg 3419e9ef7bb6SLars Ellenberg /* if peer_state changes to connected at the same time, 3420e9ef7bb6SLars Ellenberg * it explicitly notifies us that it finished resync. 3421e9ef7bb6SLars Ellenberg * Maybe we should finish it up, too? */ 3422e9ef7bb6SLars Ellenberg else if (os.conn >= C_SYNC_SOURCE && 3423e9ef7bb6SLars Ellenberg peer_state.conn == C_CONNECTED) { 3424e9ef7bb6SLars Ellenberg if (drbd_bm_total_weight(mdev) <= mdev->rs_failed) 3425e9ef7bb6SLars Ellenberg drbd_resync_finished(mdev); 342681e84650SAndreas Gruenbacher return true; 3427e9ef7bb6SLars Ellenberg } 3428e9ef7bb6SLars Ellenberg } 3429e9ef7bb6SLars Ellenberg 3430e9ef7bb6SLars Ellenberg /* peer says his disk is inconsistent, while we think it is uptodate, 3431e9ef7bb6SLars Ellenberg * and this happens while the peer still thinks we have a sync going on, 3432e9ef7bb6SLars Ellenberg * but we think we are already done with the sync. 3433e9ef7bb6SLars Ellenberg * We ignore this to avoid flapping pdsk. 3434e9ef7bb6SLars Ellenberg * This should not happen, if the peer is a recent version of drbd. */ 3435e9ef7bb6SLars Ellenberg if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && 3436e9ef7bb6SLars Ellenberg os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) 3437e9ef7bb6SLars Ellenberg real_peer_disk = D_UP_TO_DATE; 3438e9ef7bb6SLars Ellenberg 34394ac4aadaSLars Ellenberg if (ns.conn == C_WF_REPORT_PARAMS) 34404ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3441b411b363SPhilipp Reisner 344267531718SPhilipp Reisner if (peer_state.conn == C_AHEAD) 344367531718SPhilipp Reisner ns.conn = C_BEHIND; 344467531718SPhilipp Reisner 3445b411b363SPhilipp Reisner if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING && 3446b411b363SPhilipp Reisner get_ldev_if_state(mdev, D_NEGOTIATING)) { 3447b411b363SPhilipp Reisner int cr; /* consider resync */ 3448b411b363SPhilipp Reisner 3449b411b363SPhilipp Reisner /* if we established a new connection */ 34504ac4aadaSLars Ellenberg cr = (os.conn < C_CONNECTED); 3451b411b363SPhilipp Reisner /* if we had an established connection 3452b411b363SPhilipp Reisner * and one of the nodes newly attaches a disk */ 34534ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3454b411b363SPhilipp Reisner (peer_state.disk == D_NEGOTIATING || 34554ac4aadaSLars Ellenberg os.disk == D_NEGOTIATING)); 3456b411b363SPhilipp Reisner /* if we have both been inconsistent, and the peer has been 3457b411b363SPhilipp Reisner * forced to be UpToDate with --overwrite-data */ 3458b411b363SPhilipp Reisner cr |= test_bit(CONSIDER_RESYNC, &mdev->flags); 3459b411b363SPhilipp Reisner /* if we had been plain connected, and the admin requested to 3460b411b363SPhilipp Reisner * start a sync by "invalidate" or "invalidate-remote" */ 34614ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3462b411b363SPhilipp Reisner (peer_state.conn >= C_STARTING_SYNC_S && 3463b411b363SPhilipp Reisner peer_state.conn <= C_WF_BITMAP_T)); 3464b411b363SPhilipp Reisner 3465b411b363SPhilipp Reisner if (cr) 34664ac4aadaSLars Ellenberg ns.conn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk); 3467b411b363SPhilipp Reisner 3468b411b363SPhilipp Reisner put_ldev(mdev); 34694ac4aadaSLars Ellenberg if (ns.conn == C_MASK) { 34704ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3471b411b363SPhilipp Reisner if (mdev->state.disk == D_NEGOTIATING) { 347282f59cc6SLars Ellenberg drbd_force_state(mdev, NS(disk, D_FAILED)); 3473b411b363SPhilipp Reisner } else if (peer_state.disk == D_NEGOTIATING) { 3474b411b363SPhilipp Reisner dev_err(DEV, "Disk attach process on the peer node was aborted.\n"); 3475b411b363SPhilipp Reisner peer_state.disk = D_DISKLESS; 3476580b9767SLars Ellenberg real_peer_disk = D_DISKLESS; 3477b411b363SPhilipp Reisner } else { 34788169e41bSPhilipp Reisner if (test_and_clear_bit(CONN_DRY_RUN, &mdev->tconn->flags)) 347981e84650SAndreas Gruenbacher return false; 34804ac4aadaSLars Ellenberg D_ASSERT(os.conn == C_WF_REPORT_PARAMS); 348138fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 348281e84650SAndreas Gruenbacher return false; 3483b411b363SPhilipp Reisner } 3484b411b363SPhilipp Reisner } 3485b411b363SPhilipp Reisner } 3486b411b363SPhilipp Reisner 348787eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 34884ac4aadaSLars Ellenberg if (mdev->state.i != os.i) 3489b411b363SPhilipp Reisner goto retry; 3490b411b363SPhilipp Reisner clear_bit(CONSIDER_RESYNC, &mdev->flags); 3491b411b363SPhilipp Reisner ns.peer = peer_state.role; 3492b411b363SPhilipp Reisner ns.pdsk = real_peer_disk; 3493b411b363SPhilipp Reisner ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); 34944ac4aadaSLars Ellenberg if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) 3495b411b363SPhilipp Reisner ns.disk = mdev->new_state_tmp.disk; 34964ac4aadaSLars Ellenberg cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); 34974ac4aadaSLars Ellenberg if (ns.pdsk == D_CONSISTENT && is_susp(ns) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && 3498481c6f50SPhilipp Reisner test_bit(NEW_CUR_UUID, &mdev->flags)) { 34998554df1cSAndreas Gruenbacher /* Do not allow tl_restart(RESEND) for a rebooted peer. We can only allow this 3500481c6f50SPhilipp Reisner for temporal network outages! */ 350187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3502481c6f50SPhilipp Reisner dev_err(DEV, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); 35032f5cdd0bSPhilipp Reisner tl_clear(mdev->tconn); 3504481c6f50SPhilipp Reisner drbd_uuid_new_current(mdev); 3505481c6f50SPhilipp Reisner clear_bit(NEW_CUR_UUID, &mdev->flags); 350638fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS2(conn, C_PROTOCOL_ERROR, susp, 0), CS_HARD); 350781e84650SAndreas Gruenbacher return false; 3508481c6f50SPhilipp Reisner } 350965d922c3SPhilipp Reisner rv = _drbd_set_state(mdev, ns, cs_flags, NULL); 3510b411b363SPhilipp Reisner ns = mdev->state; 351187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3512b411b363SPhilipp Reisner 3513b411b363SPhilipp Reisner if (rv < SS_SUCCESS) { 351438fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); 351581e84650SAndreas Gruenbacher return false; 3516b411b363SPhilipp Reisner } 3517b411b363SPhilipp Reisner 35184ac4aadaSLars Ellenberg if (os.conn > C_WF_REPORT_PARAMS) { 35194ac4aadaSLars Ellenberg if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED && 3520b411b363SPhilipp Reisner peer_state.disk != D_NEGOTIATING ) { 3521b411b363SPhilipp Reisner /* we want resync, peer has not yet decided to sync... */ 3522b411b363SPhilipp Reisner /* Nowadays only used when forcing a node into primary role and 3523b411b363SPhilipp Reisner setting its disk to UpToDate with that */ 3524b411b363SPhilipp Reisner drbd_send_uuids(mdev); 3525b411b363SPhilipp Reisner drbd_send_state(mdev); 3526b411b363SPhilipp Reisner } 3527b411b363SPhilipp Reisner } 3528b411b363SPhilipp Reisner 352989e58e75SPhilipp Reisner mdev->tconn->net_conf->want_lose = 0; 3530b411b363SPhilipp Reisner 3531b411b363SPhilipp Reisner drbd_md_sync(mdev); /* update connected indicator, la_size, ... */ 3532b411b363SPhilipp Reisner 353381e84650SAndreas Gruenbacher return true; 3534b411b363SPhilipp Reisner } 3535b411b363SPhilipp Reisner 3536d8763023SAndreas Gruenbacher static int receive_sync_uuid(struct drbd_conf *mdev, enum drbd_packet cmd, 3537d8763023SAndreas Gruenbacher unsigned int data_size) 3538b411b363SPhilipp Reisner { 3539e42325a5SPhilipp Reisner struct p_rs_uuid *p = &mdev->tconn->data.rbuf.rs_uuid; 3540b411b363SPhilipp Reisner 3541b411b363SPhilipp Reisner wait_event(mdev->misc_wait, 3542b411b363SPhilipp Reisner mdev->state.conn == C_WF_SYNC_UUID || 3543c4752ef1SPhilipp Reisner mdev->state.conn == C_BEHIND || 3544b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED || 3545b411b363SPhilipp Reisner mdev->state.disk < D_NEGOTIATING); 3546b411b363SPhilipp Reisner 3547b411b363SPhilipp Reisner /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */ 3548b411b363SPhilipp Reisner 3549b411b363SPhilipp Reisner /* Here the _drbd_uuid_ functions are right, current should 3550b411b363SPhilipp Reisner _not_ be rotated into the history */ 3551b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_NEGOTIATING)) { 3552b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid)); 3553b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0UL); 3554b411b363SPhilipp Reisner 355562b0da3aSLars Ellenberg drbd_print_uuids(mdev, "updated sync uuid"); 3556b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_TARGET); 3557b411b363SPhilipp Reisner 3558b411b363SPhilipp Reisner put_ldev(mdev); 3559b411b363SPhilipp Reisner } else 3560b411b363SPhilipp Reisner dev_err(DEV, "Ignoring SyncUUID packet!\n"); 3561b411b363SPhilipp Reisner 356281e84650SAndreas Gruenbacher return true; 3563b411b363SPhilipp Reisner } 3564b411b363SPhilipp Reisner 35652c46407dSAndreas Gruenbacher /** 35662c46407dSAndreas Gruenbacher * receive_bitmap_plain 35672c46407dSAndreas Gruenbacher * 35682c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 35692c46407dSAndreas Gruenbacher * code upon failure. 35702c46407dSAndreas Gruenbacher */ 35712c46407dSAndreas Gruenbacher static int 357202918be2SPhilipp Reisner receive_bitmap_plain(struct drbd_conf *mdev, unsigned int data_size, 3573b411b363SPhilipp Reisner unsigned long *buffer, struct bm_xfer_ctx *c) 3574b411b363SPhilipp Reisner { 3575b411b363SPhilipp Reisner unsigned num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset); 3576b411b363SPhilipp Reisner unsigned want = num_words * sizeof(long); 35772c46407dSAndreas Gruenbacher int err; 3578b411b363SPhilipp Reisner 357902918be2SPhilipp Reisner if (want != data_size) { 358002918be2SPhilipp Reisner dev_err(DEV, "%s:want (%u) != data_size (%u)\n", __func__, want, data_size); 35812c46407dSAndreas Gruenbacher return -EIO; 3582b411b363SPhilipp Reisner } 3583b411b363SPhilipp Reisner if (want == 0) 35842c46407dSAndreas Gruenbacher return 0; 3585de0ff338SPhilipp Reisner err = drbd_recv(mdev->tconn, buffer, want); 35862c46407dSAndreas Gruenbacher if (err != want) { 35872c46407dSAndreas Gruenbacher if (err >= 0) 35882c46407dSAndreas Gruenbacher err = -EIO; 35892c46407dSAndreas Gruenbacher return err; 35902c46407dSAndreas Gruenbacher } 3591b411b363SPhilipp Reisner 3592b411b363SPhilipp Reisner drbd_bm_merge_lel(mdev, c->word_offset, num_words, buffer); 3593b411b363SPhilipp Reisner 3594b411b363SPhilipp Reisner c->word_offset += num_words; 3595b411b363SPhilipp Reisner c->bit_offset = c->word_offset * BITS_PER_LONG; 3596b411b363SPhilipp Reisner if (c->bit_offset > c->bm_bits) 3597b411b363SPhilipp Reisner c->bit_offset = c->bm_bits; 3598b411b363SPhilipp Reisner 35992c46407dSAndreas Gruenbacher return 1; 3600b411b363SPhilipp Reisner } 3601b411b363SPhilipp Reisner 36022c46407dSAndreas Gruenbacher /** 36032c46407dSAndreas Gruenbacher * recv_bm_rle_bits 36042c46407dSAndreas Gruenbacher * 36052c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 36062c46407dSAndreas Gruenbacher * code upon failure. 36072c46407dSAndreas Gruenbacher */ 36082c46407dSAndreas Gruenbacher static int 3609b411b363SPhilipp Reisner recv_bm_rle_bits(struct drbd_conf *mdev, 3610b411b363SPhilipp Reisner struct p_compressed_bm *p, 3611c6d25cfeSPhilipp Reisner struct bm_xfer_ctx *c, 3612c6d25cfeSPhilipp Reisner unsigned int len) 3613b411b363SPhilipp Reisner { 3614b411b363SPhilipp Reisner struct bitstream bs; 3615b411b363SPhilipp Reisner u64 look_ahead; 3616b411b363SPhilipp Reisner u64 rl; 3617b411b363SPhilipp Reisner u64 tmp; 3618b411b363SPhilipp Reisner unsigned long s = c->bit_offset; 3619b411b363SPhilipp Reisner unsigned long e; 3620b411b363SPhilipp Reisner int toggle = DCBP_get_start(p); 3621b411b363SPhilipp Reisner int have; 3622b411b363SPhilipp Reisner int bits; 3623b411b363SPhilipp Reisner 3624b411b363SPhilipp Reisner bitstream_init(&bs, p->code, len, DCBP_get_pad_bits(p)); 3625b411b363SPhilipp Reisner 3626b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &look_ahead, 64); 3627b411b363SPhilipp Reisner if (bits < 0) 36282c46407dSAndreas Gruenbacher return -EIO; 3629b411b363SPhilipp Reisner 3630b411b363SPhilipp Reisner for (have = bits; have > 0; s += rl, toggle = !toggle) { 3631b411b363SPhilipp Reisner bits = vli_decode_bits(&rl, look_ahead); 3632b411b363SPhilipp Reisner if (bits <= 0) 36332c46407dSAndreas Gruenbacher return -EIO; 3634b411b363SPhilipp Reisner 3635b411b363SPhilipp Reisner if (toggle) { 3636b411b363SPhilipp Reisner e = s + rl -1; 3637b411b363SPhilipp Reisner if (e >= c->bm_bits) { 3638b411b363SPhilipp Reisner dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); 36392c46407dSAndreas Gruenbacher return -EIO; 3640b411b363SPhilipp Reisner } 3641b411b363SPhilipp Reisner _drbd_bm_set_bits(mdev, s, e); 3642b411b363SPhilipp Reisner } 3643b411b363SPhilipp Reisner 3644b411b363SPhilipp Reisner if (have < bits) { 3645b411b363SPhilipp Reisner dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", 3646b411b363SPhilipp Reisner have, bits, look_ahead, 3647b411b363SPhilipp Reisner (unsigned int)(bs.cur.b - p->code), 3648b411b363SPhilipp Reisner (unsigned int)bs.buf_len); 36492c46407dSAndreas Gruenbacher return -EIO; 3650b411b363SPhilipp Reisner } 3651b411b363SPhilipp Reisner look_ahead >>= bits; 3652b411b363SPhilipp Reisner have -= bits; 3653b411b363SPhilipp Reisner 3654b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &tmp, 64 - have); 3655b411b363SPhilipp Reisner if (bits < 0) 36562c46407dSAndreas Gruenbacher return -EIO; 3657b411b363SPhilipp Reisner look_ahead |= tmp << have; 3658b411b363SPhilipp Reisner have += bits; 3659b411b363SPhilipp Reisner } 3660b411b363SPhilipp Reisner 3661b411b363SPhilipp Reisner c->bit_offset = s; 3662b411b363SPhilipp Reisner bm_xfer_ctx_bit_to_word_offset(c); 3663b411b363SPhilipp Reisner 36642c46407dSAndreas Gruenbacher return (s != c->bm_bits); 3665b411b363SPhilipp Reisner } 3666b411b363SPhilipp Reisner 36672c46407dSAndreas Gruenbacher /** 36682c46407dSAndreas Gruenbacher * decode_bitmap_c 36692c46407dSAndreas Gruenbacher * 36702c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 36712c46407dSAndreas Gruenbacher * code upon failure. 36722c46407dSAndreas Gruenbacher */ 36732c46407dSAndreas Gruenbacher static int 3674b411b363SPhilipp Reisner decode_bitmap_c(struct drbd_conf *mdev, 3675b411b363SPhilipp Reisner struct p_compressed_bm *p, 3676c6d25cfeSPhilipp Reisner struct bm_xfer_ctx *c, 3677c6d25cfeSPhilipp Reisner unsigned int len) 3678b411b363SPhilipp Reisner { 3679b411b363SPhilipp Reisner if (DCBP_get_code(p) == RLE_VLI_Bits) 3680c6d25cfeSPhilipp Reisner return recv_bm_rle_bits(mdev, p, c, len); 3681b411b363SPhilipp Reisner 3682b411b363SPhilipp Reisner /* other variants had been implemented for evaluation, 3683b411b363SPhilipp Reisner * but have been dropped as this one turned out to be "best" 3684b411b363SPhilipp Reisner * during all our tests. */ 3685b411b363SPhilipp Reisner 3686b411b363SPhilipp Reisner dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding); 368738fa9988SPhilipp Reisner conn_request_state(mdev->tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); 36882c46407dSAndreas Gruenbacher return -EIO; 3689b411b363SPhilipp Reisner } 3690b411b363SPhilipp Reisner 3691b411b363SPhilipp Reisner void INFO_bm_xfer_stats(struct drbd_conf *mdev, 3692b411b363SPhilipp Reisner const char *direction, struct bm_xfer_ctx *c) 3693b411b363SPhilipp Reisner { 3694b411b363SPhilipp Reisner /* what would it take to transfer it "plaintext" */ 3695c012949aSPhilipp Reisner unsigned plain = sizeof(struct p_header) * 3696b411b363SPhilipp Reisner ((c->bm_words+BM_PACKET_WORDS-1)/BM_PACKET_WORDS+1) 3697b411b363SPhilipp Reisner + c->bm_words * sizeof(long); 3698b411b363SPhilipp Reisner unsigned total = c->bytes[0] + c->bytes[1]; 3699b411b363SPhilipp Reisner unsigned r; 3700b411b363SPhilipp Reisner 3701b411b363SPhilipp Reisner /* total can not be zero. but just in case: */ 3702b411b363SPhilipp Reisner if (total == 0) 3703b411b363SPhilipp Reisner return; 3704b411b363SPhilipp Reisner 3705b411b363SPhilipp Reisner /* don't report if not compressed */ 3706b411b363SPhilipp Reisner if (total >= plain) 3707b411b363SPhilipp Reisner return; 3708b411b363SPhilipp Reisner 3709b411b363SPhilipp Reisner /* total < plain. check for overflow, still */ 3710b411b363SPhilipp Reisner r = (total > UINT_MAX/1000) ? (total / (plain/1000)) 3711b411b363SPhilipp Reisner : (1000 * total / plain); 3712b411b363SPhilipp Reisner 3713b411b363SPhilipp Reisner if (r > 1000) 3714b411b363SPhilipp Reisner r = 1000; 3715b411b363SPhilipp Reisner 3716b411b363SPhilipp Reisner r = 1000 - r; 3717b411b363SPhilipp Reisner dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " 3718b411b363SPhilipp Reisner "total %u; compression: %u.%u%%\n", 3719b411b363SPhilipp Reisner direction, 3720b411b363SPhilipp Reisner c->bytes[1], c->packets[1], 3721b411b363SPhilipp Reisner c->bytes[0], c->packets[0], 3722b411b363SPhilipp Reisner total, r/10, r % 10); 3723b411b363SPhilipp Reisner } 3724b411b363SPhilipp Reisner 3725b411b363SPhilipp Reisner /* Since we are processing the bitfield from lower addresses to higher, 3726b411b363SPhilipp Reisner it does not matter if the process it in 32 bit chunks or 64 bit 3727b411b363SPhilipp Reisner chunks as long as it is little endian. (Understand it as byte stream, 3728b411b363SPhilipp Reisner beginning with the lowest byte...) If we would use big endian 3729b411b363SPhilipp Reisner we would need to process it from the highest address to the lowest, 3730b411b363SPhilipp Reisner in order to be agnostic to the 32 vs 64 bits issue. 3731b411b363SPhilipp Reisner 3732b411b363SPhilipp Reisner returns 0 on failure, 1 if we successfully received it. */ 3733d8763023SAndreas Gruenbacher static int receive_bitmap(struct drbd_conf *mdev, enum drbd_packet cmd, 3734d8763023SAndreas Gruenbacher unsigned int data_size) 3735b411b363SPhilipp Reisner { 3736b411b363SPhilipp Reisner struct bm_xfer_ctx c; 3737b411b363SPhilipp Reisner void *buffer; 37382c46407dSAndreas Gruenbacher int err; 373981e84650SAndreas Gruenbacher int ok = false; 3740257d0af6SPhilipp Reisner struct p_header *h = &mdev->tconn->data.rbuf.header; 374177351055SPhilipp Reisner struct packet_info pi; 3742b411b363SPhilipp Reisner 374320ceb2b2SLars Ellenberg drbd_bm_lock(mdev, "receive bitmap", BM_LOCKED_SET_ALLOWED); 374420ceb2b2SLars Ellenberg /* you are supposed to send additional out-of-sync information 374520ceb2b2SLars Ellenberg * if you actually set bits during this phase */ 3746b411b363SPhilipp Reisner 3747b411b363SPhilipp Reisner /* maybe we should use some per thread scratch page, 3748b411b363SPhilipp Reisner * and allocate that during initial device creation? */ 3749b411b363SPhilipp Reisner buffer = (unsigned long *) __get_free_page(GFP_NOIO); 3750b411b363SPhilipp Reisner if (!buffer) { 3751b411b363SPhilipp Reisner dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__); 3752b411b363SPhilipp Reisner goto out; 3753b411b363SPhilipp Reisner } 3754b411b363SPhilipp Reisner 3755b411b363SPhilipp Reisner c = (struct bm_xfer_ctx) { 3756b411b363SPhilipp Reisner .bm_bits = drbd_bm_bits(mdev), 3757b411b363SPhilipp Reisner .bm_words = drbd_bm_words(mdev), 3758b411b363SPhilipp Reisner }; 3759b411b363SPhilipp Reisner 37602c46407dSAndreas Gruenbacher for(;;) { 376102918be2SPhilipp Reisner if (cmd == P_BITMAP) { 37622c46407dSAndreas Gruenbacher err = receive_bitmap_plain(mdev, data_size, buffer, &c); 376302918be2SPhilipp Reisner } else if (cmd == P_COMPRESSED_BITMAP) { 3764b411b363SPhilipp Reisner /* MAYBE: sanity check that we speak proto >= 90, 3765b411b363SPhilipp Reisner * and the feature is enabled! */ 3766b411b363SPhilipp Reisner struct p_compressed_bm *p; 3767b411b363SPhilipp Reisner 376802918be2SPhilipp Reisner if (data_size > BM_PACKET_PAYLOAD_BYTES) { 3769b411b363SPhilipp Reisner dev_err(DEV, "ReportCBitmap packet too large\n"); 3770b411b363SPhilipp Reisner goto out; 3771b411b363SPhilipp Reisner } 3772b411b363SPhilipp Reisner /* use the page buff */ 3773b411b363SPhilipp Reisner p = buffer; 3774b411b363SPhilipp Reisner memcpy(p, h, sizeof(*h)); 3775de0ff338SPhilipp Reisner if (drbd_recv(mdev->tconn, p->head.payload, data_size) != data_size) 3776b411b363SPhilipp Reisner goto out; 3777004352faSLars Ellenberg if (data_size <= (sizeof(*p) - sizeof(p->head))) { 3778004352faSLars Ellenberg dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", data_size); 377978fcbdaeSAndreas Gruenbacher goto out; 3780b411b363SPhilipp Reisner } 3781c6d25cfeSPhilipp Reisner err = decode_bitmap_c(mdev, p, &c, data_size); 3782b411b363SPhilipp Reisner } else { 378302918be2SPhilipp Reisner dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", cmd); 3784b411b363SPhilipp Reisner goto out; 3785b411b363SPhilipp Reisner } 3786b411b363SPhilipp Reisner 378702918be2SPhilipp Reisner c.packets[cmd == P_BITMAP]++; 3788257d0af6SPhilipp Reisner c.bytes[cmd == P_BITMAP] += sizeof(struct p_header) + data_size; 3789b411b363SPhilipp Reisner 37902c46407dSAndreas Gruenbacher if (err <= 0) { 37912c46407dSAndreas Gruenbacher if (err < 0) 37922c46407dSAndreas Gruenbacher goto out; 3793b411b363SPhilipp Reisner break; 37942c46407dSAndreas Gruenbacher } 379569bc7bc3SAndreas Gruenbacher if (drbd_recv_header(mdev->tconn, &pi)) 3796b411b363SPhilipp Reisner goto out; 379777351055SPhilipp Reisner cmd = pi.cmd; 379877351055SPhilipp Reisner data_size = pi.size; 37992c46407dSAndreas Gruenbacher } 3800b411b363SPhilipp Reisner 3801b411b363SPhilipp Reisner INFO_bm_xfer_stats(mdev, "receive", &c); 3802b411b363SPhilipp Reisner 3803b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_BITMAP_T) { 3804de1f8e4aSAndreas Gruenbacher enum drbd_state_rv rv; 3805de1f8e4aSAndreas Gruenbacher 3806b411b363SPhilipp Reisner ok = !drbd_send_bitmap(mdev); 3807b411b363SPhilipp Reisner if (!ok) 3808b411b363SPhilipp Reisner goto out; 3809b411b363SPhilipp Reisner /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ 3810de1f8e4aSAndreas Gruenbacher rv = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); 3811de1f8e4aSAndreas Gruenbacher D_ASSERT(rv == SS_SUCCESS); 3812b411b363SPhilipp Reisner } else if (mdev->state.conn != C_WF_BITMAP_S) { 3813b411b363SPhilipp Reisner /* admin may have requested C_DISCONNECTING, 3814b411b363SPhilipp Reisner * other threads may have noticed network errors */ 3815b411b363SPhilipp Reisner dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n", 3816b411b363SPhilipp Reisner drbd_conn_str(mdev->state.conn)); 3817b411b363SPhilipp Reisner } 3818b411b363SPhilipp Reisner 381981e84650SAndreas Gruenbacher ok = true; 3820b411b363SPhilipp Reisner out: 382120ceb2b2SLars Ellenberg drbd_bm_unlock(mdev); 3822b411b363SPhilipp Reisner if (ok && mdev->state.conn == C_WF_BITMAP_S) 3823b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_SOURCE); 3824b411b363SPhilipp Reisner free_page((unsigned long) buffer); 3825b411b363SPhilipp Reisner return ok; 3826b411b363SPhilipp Reisner } 3827b411b363SPhilipp Reisner 38282de876efSPhilipp Reisner static int _tconn_receive_skip(struct drbd_tconn *tconn, unsigned int data_size) 3829b411b363SPhilipp Reisner { 3830b411b363SPhilipp Reisner /* TODO zero copy sink :) */ 3831b411b363SPhilipp Reisner static char sink[128]; 3832b411b363SPhilipp Reisner int size, want, r; 3833b411b363SPhilipp Reisner 383402918be2SPhilipp Reisner size = data_size; 3835b411b363SPhilipp Reisner while (size > 0) { 3836b411b363SPhilipp Reisner want = min_t(int, size, sizeof(sink)); 38372de876efSPhilipp Reisner r = drbd_recv(tconn, sink, want); 38382de876efSPhilipp Reisner if (r <= 0) 3839841ce241SAndreas Gruenbacher break; 3840b411b363SPhilipp Reisner size -= r; 3841b411b363SPhilipp Reisner } 3842b411b363SPhilipp Reisner return size == 0; 3843b411b363SPhilipp Reisner } 3844b411b363SPhilipp Reisner 38452de876efSPhilipp Reisner static int receive_skip(struct drbd_conf *mdev, enum drbd_packet cmd, 38462de876efSPhilipp Reisner unsigned int data_size) 38472de876efSPhilipp Reisner { 38482de876efSPhilipp Reisner dev_warn(DEV, "skipping unknown optional packet type %d, l: %d!\n", 38492de876efSPhilipp Reisner cmd, data_size); 38502de876efSPhilipp Reisner 38512de876efSPhilipp Reisner return _tconn_receive_skip(mdev->tconn, data_size); 38522de876efSPhilipp Reisner } 38532de876efSPhilipp Reisner 38542de876efSPhilipp Reisner static int tconn_receive_skip(struct drbd_tconn *tconn, enum drbd_packet cmd, unsigned int data_size) 38552de876efSPhilipp Reisner { 38562de876efSPhilipp Reisner conn_warn(tconn, "skipping packet for non existing volume type %d, l: %d!\n", 38572de876efSPhilipp Reisner cmd, data_size); 38582de876efSPhilipp Reisner 38592de876efSPhilipp Reisner return _tconn_receive_skip(tconn, data_size); 38602de876efSPhilipp Reisner } 38612de876efSPhilipp Reisner 3862d8763023SAndreas Gruenbacher static int receive_UnplugRemote(struct drbd_conf *mdev, enum drbd_packet cmd, 3863d8763023SAndreas Gruenbacher unsigned int data_size) 3864b411b363SPhilipp Reisner { 3865b411b363SPhilipp Reisner /* Make sure we've acked all the TCP data associated 3866b411b363SPhilipp Reisner * with the data requests being unplugged */ 3867e42325a5SPhilipp Reisner drbd_tcp_quickack(mdev->tconn->data.socket); 3868b411b363SPhilipp Reisner 386981e84650SAndreas Gruenbacher return true; 3870b411b363SPhilipp Reisner } 3871b411b363SPhilipp Reisner 3872d8763023SAndreas Gruenbacher static int receive_out_of_sync(struct drbd_conf *mdev, enum drbd_packet cmd, 3873d8763023SAndreas Gruenbacher unsigned int data_size) 387473a01a18SPhilipp Reisner { 3875e42325a5SPhilipp Reisner struct p_block_desc *p = &mdev->tconn->data.rbuf.block_desc; 387673a01a18SPhilipp Reisner 3877f735e363SLars Ellenberg switch (mdev->state.conn) { 3878f735e363SLars Ellenberg case C_WF_SYNC_UUID: 3879f735e363SLars Ellenberg case C_WF_BITMAP_T: 3880f735e363SLars Ellenberg case C_BEHIND: 3881f735e363SLars Ellenberg break; 3882f735e363SLars Ellenberg default: 3883f735e363SLars Ellenberg dev_err(DEV, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n", 3884f735e363SLars Ellenberg drbd_conn_str(mdev->state.conn)); 3885f735e363SLars Ellenberg } 3886f735e363SLars Ellenberg 388773a01a18SPhilipp Reisner drbd_set_out_of_sync(mdev, be64_to_cpu(p->sector), be32_to_cpu(p->blksize)); 388873a01a18SPhilipp Reisner 388981e84650SAndreas Gruenbacher return true; 389073a01a18SPhilipp Reisner } 389173a01a18SPhilipp Reisner 389202918be2SPhilipp Reisner struct data_cmd { 389302918be2SPhilipp Reisner int expect_payload; 389402918be2SPhilipp Reisner size_t pkt_size; 3895a4fbda8eSPhilipp Reisner enum mdev_or_conn fa_type; /* first argument's type */ 3896d9ae84e7SPhilipp Reisner union { 3897d9ae84e7SPhilipp Reisner int (*mdev_fn)(struct drbd_conf *, enum drbd_packet cmd, 3898d9ae84e7SPhilipp Reisner unsigned int to_receive); 3899d9ae84e7SPhilipp Reisner int (*conn_fn)(struct drbd_tconn *, enum drbd_packet cmd, 3900d9ae84e7SPhilipp Reisner unsigned int to_receive); 3901d9ae84e7SPhilipp Reisner }; 3902b411b363SPhilipp Reisner }; 3903b411b363SPhilipp Reisner 390402918be2SPhilipp Reisner static struct data_cmd drbd_cmd_handler[] = { 3905d9ae84e7SPhilipp Reisner [P_DATA] = { 1, sizeof(struct p_data), MDEV, { receive_Data } }, 3906d9ae84e7SPhilipp Reisner [P_DATA_REPLY] = { 1, sizeof(struct p_data), MDEV, { receive_DataReply } }, 3907d9ae84e7SPhilipp Reisner [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), MDEV, { receive_RSDataReply } } , 3908d9ae84e7SPhilipp Reisner [P_BARRIER] = { 0, sizeof(struct p_barrier), MDEV, { receive_Barrier } } , 3909d9ae84e7SPhilipp Reisner [P_BITMAP] = { 1, sizeof(struct p_header), MDEV, { receive_bitmap } } , 3910d9ae84e7SPhilipp Reisner [P_COMPRESSED_BITMAP] = { 1, sizeof(struct p_header), MDEV, { receive_bitmap } } , 3911d9ae84e7SPhilipp Reisner [P_UNPLUG_REMOTE] = { 0, sizeof(struct p_header), MDEV, { receive_UnplugRemote } }, 3912d9ae84e7SPhilipp Reisner [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), MDEV, { receive_DataRequest } }, 3913d9ae84e7SPhilipp Reisner [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), MDEV, { receive_DataRequest } }, 3914d9ae84e7SPhilipp Reisner [P_SYNC_PARAM] = { 1, sizeof(struct p_header), MDEV, { receive_SyncParam } }, 3915d9ae84e7SPhilipp Reisner [P_SYNC_PARAM89] = { 1, sizeof(struct p_header), MDEV, { receive_SyncParam } }, 39167204624cSPhilipp Reisner [P_PROTOCOL] = { 1, sizeof(struct p_protocol), CONN, { .conn_fn = receive_protocol } }, 3917d9ae84e7SPhilipp Reisner [P_UUIDS] = { 0, sizeof(struct p_uuids), MDEV, { receive_uuids } }, 3918d9ae84e7SPhilipp Reisner [P_SIZES] = { 0, sizeof(struct p_sizes), MDEV, { receive_sizes } }, 3919d9ae84e7SPhilipp Reisner [P_STATE] = { 0, sizeof(struct p_state), MDEV, { receive_state } }, 3920d9ae84e7SPhilipp Reisner [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), MDEV, { receive_req_state } }, 3921d9ae84e7SPhilipp Reisner [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), MDEV, { receive_sync_uuid } }, 3922d9ae84e7SPhilipp Reisner [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), MDEV, { receive_DataRequest } }, 3923d9ae84e7SPhilipp Reisner [P_OV_REPLY] = { 1, sizeof(struct p_block_req), MDEV, { receive_DataRequest } }, 3924d9ae84e7SPhilipp Reisner [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), MDEV, { receive_DataRequest } }, 3925d9ae84e7SPhilipp Reisner [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), MDEV, { receive_skip } }, 3926d9ae84e7SPhilipp Reisner [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), MDEV, { receive_out_of_sync } }, 3927dfafcc8aSPhilipp Reisner [P_CONN_ST_CHG_REQ] = { 0, sizeof(struct p_req_state), CONN, { .conn_fn = receive_req_conn_state } }, 392802918be2SPhilipp Reisner }; 392902918be2SPhilipp Reisner 393002918be2SPhilipp Reisner /* All handler functions that expect a sub-header get that sub-heder in 3931e42325a5SPhilipp Reisner mdev->tconn->data.rbuf.header.head.payload. 393202918be2SPhilipp Reisner 3933e42325a5SPhilipp Reisner Usually in mdev->tconn->data.rbuf.header.head the callback can find the usual 393402918be2SPhilipp Reisner p_header, but they may not rely on that. Since there is also p_header95 ! 393502918be2SPhilipp Reisner */ 3936b411b363SPhilipp Reisner 3937eefc2f7dSPhilipp Reisner static void drbdd(struct drbd_tconn *tconn) 3938b411b363SPhilipp Reisner { 3939eefc2f7dSPhilipp Reisner struct p_header *header = &tconn->data.rbuf.header; 394077351055SPhilipp Reisner struct packet_info pi; 394102918be2SPhilipp Reisner size_t shs; /* sub header size */ 394202918be2SPhilipp Reisner int rv; 3943b411b363SPhilipp Reisner 3944eefc2f7dSPhilipp Reisner while (get_t_state(&tconn->receiver) == RUNNING) { 3945eefc2f7dSPhilipp Reisner drbd_thread_current_set_cpu(&tconn->receiver); 394669bc7bc3SAndreas Gruenbacher if (drbd_recv_header(tconn, &pi)) 394702918be2SPhilipp Reisner goto err_out; 394802918be2SPhilipp Reisner 39496e849ce8SAndreas Gruenbacher if (unlikely(pi.cmd >= ARRAY_SIZE(drbd_cmd_handler) || 3950d9ae84e7SPhilipp Reisner !drbd_cmd_handler[pi.cmd].mdev_fn)) { 3951eefc2f7dSPhilipp Reisner conn_err(tconn, "unknown packet type %d, l: %d!\n", pi.cmd, pi.size); 395202918be2SPhilipp Reisner goto err_out; 39530b33a916SLars Ellenberg } 3954b411b363SPhilipp Reisner 395577351055SPhilipp Reisner shs = drbd_cmd_handler[pi.cmd].pkt_size - sizeof(struct p_header); 395677351055SPhilipp Reisner if (pi.size - shs > 0 && !drbd_cmd_handler[pi.cmd].expect_payload) { 3957eefc2f7dSPhilipp Reisner conn_err(tconn, "No payload expected %s l:%d\n", cmdname(pi.cmd), pi.size); 3958c13f7e1aSLars Ellenberg goto err_out; 3959c13f7e1aSLars Ellenberg } 3960c13f7e1aSLars Ellenberg 3961c13f7e1aSLars Ellenberg if (shs) { 3962eefc2f7dSPhilipp Reisner rv = drbd_recv(tconn, &header->payload, shs); 396302918be2SPhilipp Reisner if (unlikely(rv != shs)) { 39640ddc5549SLars Ellenberg if (!signal_pending(current)) 3965eefc2f7dSPhilipp Reisner conn_warn(tconn, "short read while reading sub header: rv=%d\n", rv); 396602918be2SPhilipp Reisner goto err_out; 3967b411b363SPhilipp Reisner } 396802918be2SPhilipp Reisner } 396902918be2SPhilipp Reisner 3970a4fbda8eSPhilipp Reisner if (drbd_cmd_handler[pi.cmd].fa_type == CONN) { 3971d9ae84e7SPhilipp Reisner rv = drbd_cmd_handler[pi.cmd].conn_fn(tconn, pi.cmd, pi.size - shs); 3972d9ae84e7SPhilipp Reisner } else { 3973d9ae84e7SPhilipp Reisner struct drbd_conf *mdev = vnr_to_mdev(tconn, pi.vnr); 39742de876efSPhilipp Reisner rv = mdev ? 3975d9ae84e7SPhilipp Reisner drbd_cmd_handler[pi.cmd].mdev_fn(mdev, pi.cmd, pi.size - shs) : 39762de876efSPhilipp Reisner tconn_receive_skip(tconn, pi.cmd, pi.size - shs); 3977d9ae84e7SPhilipp Reisner } 397802918be2SPhilipp Reisner 397902918be2SPhilipp Reisner if (unlikely(!rv)) { 3980eefc2f7dSPhilipp Reisner conn_err(tconn, "error receiving %s, l: %d!\n", 398177351055SPhilipp Reisner cmdname(pi.cmd), pi.size); 398202918be2SPhilipp Reisner goto err_out; 3983b411b363SPhilipp Reisner } 3984b411b363SPhilipp Reisner } 398502918be2SPhilipp Reisner 398602918be2SPhilipp Reisner if (0) { 398702918be2SPhilipp Reisner err_out: 3988bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); 3989b411b363SPhilipp Reisner } 3990b411b363SPhilipp Reisner } 3991b411b363SPhilipp Reisner 39920e29d163SPhilipp Reisner void conn_flush_workqueue(struct drbd_tconn *tconn) 3993b411b363SPhilipp Reisner { 3994b411b363SPhilipp Reisner struct drbd_wq_barrier barr; 3995b411b363SPhilipp Reisner 3996b411b363SPhilipp Reisner barr.w.cb = w_prev_work_done; 39970e29d163SPhilipp Reisner barr.w.tconn = tconn; 3998b411b363SPhilipp Reisner init_completion(&barr.done); 39990e29d163SPhilipp Reisner drbd_queue_work(&tconn->data.work, &barr.w); 4000b411b363SPhilipp Reisner wait_for_completion(&barr.done); 4001b411b363SPhilipp Reisner } 4002b411b363SPhilipp Reisner 4003360cc740SPhilipp Reisner static void drbd_disconnect(struct drbd_tconn *tconn) 4004b411b363SPhilipp Reisner { 4005bbeb641cSPhilipp Reisner enum drbd_conns oc; 4006b411b363SPhilipp Reisner int rv = SS_UNKNOWN_ERROR; 4007b411b363SPhilipp Reisner 4008bbeb641cSPhilipp Reisner if (tconn->cstate == C_STANDALONE) 4009b411b363SPhilipp Reisner return; 4010b411b363SPhilipp Reisner 4011b411b363SPhilipp Reisner /* asender does not clean up anything. it must not interfere, either */ 4012360cc740SPhilipp Reisner drbd_thread_stop(&tconn->asender); 4013360cc740SPhilipp Reisner drbd_free_sock(tconn); 4014360cc740SPhilipp Reisner 4015360cc740SPhilipp Reisner idr_for_each(&tconn->volumes, drbd_disconnected, tconn); 4016360cc740SPhilipp Reisner 4017360cc740SPhilipp Reisner conn_info(tconn, "Connection closed\n"); 4018360cc740SPhilipp Reisner 4019360cc740SPhilipp Reisner spin_lock_irq(&tconn->req_lock); 4020bbeb641cSPhilipp Reisner oc = tconn->cstate; 4021bbeb641cSPhilipp Reisner if (oc >= C_UNCONNECTED) 4022bbeb641cSPhilipp Reisner rv = _conn_request_state(tconn, NS(conn, C_UNCONNECTED), CS_VERBOSE); 4023bbeb641cSPhilipp Reisner 4024360cc740SPhilipp Reisner spin_unlock_irq(&tconn->req_lock); 4025360cc740SPhilipp Reisner 4026bbeb641cSPhilipp Reisner if (oc == C_DISCONNECTING) { 4027360cc740SPhilipp Reisner wait_event(tconn->net_cnt_wait, atomic_read(&tconn->net_cnt) == 0); 4028360cc740SPhilipp Reisner 4029360cc740SPhilipp Reisner crypto_free_hash(tconn->cram_hmac_tfm); 4030360cc740SPhilipp Reisner tconn->cram_hmac_tfm = NULL; 4031360cc740SPhilipp Reisner 4032360cc740SPhilipp Reisner kfree(tconn->net_conf); 4033360cc740SPhilipp Reisner tconn->net_conf = NULL; 4034bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_STANDALONE), CS_VERBOSE); 4035360cc740SPhilipp Reisner } 4036360cc740SPhilipp Reisner } 4037360cc740SPhilipp Reisner 4038360cc740SPhilipp Reisner static int drbd_disconnected(int vnr, void *p, void *data) 4039360cc740SPhilipp Reisner { 4040360cc740SPhilipp Reisner struct drbd_conf *mdev = (struct drbd_conf *)p; 4041360cc740SPhilipp Reisner enum drbd_fencing_p fp; 4042360cc740SPhilipp Reisner unsigned int i; 4043b411b363SPhilipp Reisner 404485719573SPhilipp Reisner /* wait for current activity to cease. */ 404587eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 4046b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 4047b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee); 4048b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->read_ee); 404987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 4050b411b363SPhilipp Reisner 4051b411b363SPhilipp Reisner /* We do not have data structures that would allow us to 4052b411b363SPhilipp Reisner * get the rs_pending_cnt down to 0 again. 4053b411b363SPhilipp Reisner * * On C_SYNC_TARGET we do not have any data structures describing 4054b411b363SPhilipp Reisner * the pending RSDataRequest's we have sent. 4055b411b363SPhilipp Reisner * * On C_SYNC_SOURCE there is no data structure that tracks 4056b411b363SPhilipp Reisner * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. 4057b411b363SPhilipp Reisner * And no, it is not the sum of the reference counts in the 4058b411b363SPhilipp Reisner * resync_LRU. The resync_LRU tracks the whole operation including 4059b411b363SPhilipp Reisner * the disk-IO, while the rs_pending_cnt only tracks the blocks 4060b411b363SPhilipp Reisner * on the fly. */ 4061b411b363SPhilipp Reisner drbd_rs_cancel_all(mdev); 4062b411b363SPhilipp Reisner mdev->rs_total = 0; 4063b411b363SPhilipp Reisner mdev->rs_failed = 0; 4064b411b363SPhilipp Reisner atomic_set(&mdev->rs_pending_cnt, 0); 4065b411b363SPhilipp Reisner wake_up(&mdev->misc_wait); 4066b411b363SPhilipp Reisner 40677fde2be9SPhilipp Reisner del_timer(&mdev->request_timer); 40687fde2be9SPhilipp Reisner 4069b411b363SPhilipp Reisner del_timer_sync(&mdev->resync_timer); 4070b411b363SPhilipp Reisner resync_timer_fn((unsigned long)mdev); 4071b411b363SPhilipp Reisner 4072b411b363SPhilipp Reisner /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, 4073b411b363SPhilipp Reisner * w_make_resync_request etc. which may still be on the worker queue 4074b411b363SPhilipp Reisner * to be "canceled" */ 4075a21e9298SPhilipp Reisner drbd_flush_workqueue(mdev); 4076b411b363SPhilipp Reisner 4077b411b363SPhilipp Reisner /* This also does reclaim_net_ee(). If we do this too early, we might 4078b411b363SPhilipp Reisner * miss some resync ee and pages.*/ 4079b411b363SPhilipp Reisner drbd_process_done_ee(mdev); 4080b411b363SPhilipp Reisner 4081b411b363SPhilipp Reisner kfree(mdev->p_uuid); 4082b411b363SPhilipp Reisner mdev->p_uuid = NULL; 4083b411b363SPhilipp Reisner 4084fb22c402SPhilipp Reisner if (!is_susp(mdev->state)) 40852f5cdd0bSPhilipp Reisner tl_clear(mdev->tconn); 4086b411b363SPhilipp Reisner 4087b411b363SPhilipp Reisner drbd_md_sync(mdev); 4088b411b363SPhilipp Reisner 4089b411b363SPhilipp Reisner fp = FP_DONT_CARE; 4090b411b363SPhilipp Reisner if (get_ldev(mdev)) { 4091b411b363SPhilipp Reisner fp = mdev->ldev->dc.fencing; 4092b411b363SPhilipp Reisner put_ldev(mdev); 4093b411b363SPhilipp Reisner } 4094b411b363SPhilipp Reisner 409587f7be4cSPhilipp Reisner if (mdev->state.role == R_PRIMARY && fp >= FP_RESOURCE && mdev->state.pdsk >= D_UNKNOWN) 409687f7be4cSPhilipp Reisner drbd_try_outdate_peer_async(mdev); 4097b411b363SPhilipp Reisner 409820ceb2b2SLars Ellenberg /* serialize with bitmap writeout triggered by the state change, 409920ceb2b2SLars Ellenberg * if any. */ 410020ceb2b2SLars Ellenberg wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags)); 410120ceb2b2SLars Ellenberg 4102b411b363SPhilipp Reisner /* tcp_close and release of sendpage pages can be deferred. I don't 4103b411b363SPhilipp Reisner * want to use SO_LINGER, because apparently it can be deferred for 4104b411b363SPhilipp Reisner * more than 20 seconds (longest time I checked). 4105b411b363SPhilipp Reisner * 4106b411b363SPhilipp Reisner * Actually we don't care for exactly when the network stack does its 4107b411b363SPhilipp Reisner * put_page(), but release our reference on these pages right here. 4108b411b363SPhilipp Reisner */ 4109b411b363SPhilipp Reisner i = drbd_release_ee(mdev, &mdev->net_ee); 4110b411b363SPhilipp Reisner if (i) 4111b411b363SPhilipp Reisner dev_info(DEV, "net_ee not empty, killed %u entries\n", i); 4112435f0740SLars Ellenberg i = atomic_read(&mdev->pp_in_use_by_net); 4113435f0740SLars Ellenberg if (i) 4114435f0740SLars Ellenberg dev_info(DEV, "pp_in_use_by_net = %d, expected 0\n", i); 4115b411b363SPhilipp Reisner i = atomic_read(&mdev->pp_in_use); 4116b411b363SPhilipp Reisner if (i) 411745bb912bSLars Ellenberg dev_info(DEV, "pp_in_use = %d, expected 0\n", i); 4118b411b363SPhilipp Reisner 4119b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->read_ee)); 4120b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->active_ee)); 4121b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->sync_ee)); 4122b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->done_ee)); 4123b411b363SPhilipp Reisner 4124b411b363SPhilipp Reisner /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ 4125b411b363SPhilipp Reisner atomic_set(&mdev->current_epoch->epoch_size, 0); 4126b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->current_epoch->list)); 4127360cc740SPhilipp Reisner 4128360cc740SPhilipp Reisner return 0; 4129b411b363SPhilipp Reisner } 4130b411b363SPhilipp Reisner 4131b411b363SPhilipp Reisner /* 4132b411b363SPhilipp Reisner * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version 4133b411b363SPhilipp Reisner * we can agree on is stored in agreed_pro_version. 4134b411b363SPhilipp Reisner * 4135b411b363SPhilipp Reisner * feature flags and the reserved array should be enough room for future 4136b411b363SPhilipp Reisner * enhancements of the handshake protocol, and possible plugins... 4137b411b363SPhilipp Reisner * 4138b411b363SPhilipp Reisner * for now, they are expected to be zero, but ignored. 4139b411b363SPhilipp Reisner */ 41408a22ccccSPhilipp Reisner static int drbd_send_handshake(struct drbd_tconn *tconn) 4141b411b363SPhilipp Reisner { 4142e6b3ea83SPhilipp Reisner /* ASSERT current == mdev->tconn->receiver ... */ 41438a22ccccSPhilipp Reisner struct p_handshake *p = &tconn->data.sbuf.handshake; 4144e8d17b01SAndreas Gruenbacher int err; 4145b411b363SPhilipp Reisner 41468a22ccccSPhilipp Reisner if (mutex_lock_interruptible(&tconn->data.mutex)) { 41478a22ccccSPhilipp Reisner conn_err(tconn, "interrupted during initial handshake\n"); 4148e8d17b01SAndreas Gruenbacher return -EINTR; 4149b411b363SPhilipp Reisner } 4150b411b363SPhilipp Reisner 41518a22ccccSPhilipp Reisner if (tconn->data.socket == NULL) { 41528a22ccccSPhilipp Reisner mutex_unlock(&tconn->data.mutex); 4153e8d17b01SAndreas Gruenbacher return -EIO; 4154b411b363SPhilipp Reisner } 4155b411b363SPhilipp Reisner 4156b411b363SPhilipp Reisner memset(p, 0, sizeof(*p)); 4157b411b363SPhilipp Reisner p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); 4158b411b363SPhilipp Reisner p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); 4159e8d17b01SAndreas Gruenbacher err = _conn_send_cmd(tconn, 0, tconn->data.socket, P_HAND_SHAKE, 4160c012949aSPhilipp Reisner &p->head, sizeof(*p), 0); 41618a22ccccSPhilipp Reisner mutex_unlock(&tconn->data.mutex); 4162e8d17b01SAndreas Gruenbacher return err; 4163b411b363SPhilipp Reisner } 4164b411b363SPhilipp Reisner 4165b411b363SPhilipp Reisner /* 4166b411b363SPhilipp Reisner * return values: 4167b411b363SPhilipp Reisner * 1 yes, we have a valid connection 4168b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 4169b411b363SPhilipp Reisner * -1 peer talks different language, 4170b411b363SPhilipp Reisner * no point in trying again, please go standalone. 4171b411b363SPhilipp Reisner */ 417265d11ed6SPhilipp Reisner static int drbd_do_handshake(struct drbd_tconn *tconn) 4173b411b363SPhilipp Reisner { 417465d11ed6SPhilipp Reisner /* ASSERT current == tconn->receiver ... */ 417565d11ed6SPhilipp Reisner struct p_handshake *p = &tconn->data.rbuf.handshake; 417602918be2SPhilipp Reisner const int expect = sizeof(struct p_handshake) - sizeof(struct p_header80); 417777351055SPhilipp Reisner struct packet_info pi; 4178e8d17b01SAndreas Gruenbacher int err, rv; 4179b411b363SPhilipp Reisner 4180e8d17b01SAndreas Gruenbacher err = drbd_send_handshake(tconn); 4181e8d17b01SAndreas Gruenbacher if (err) 4182b411b363SPhilipp Reisner return 0; 4183b411b363SPhilipp Reisner 418469bc7bc3SAndreas Gruenbacher err = drbd_recv_header(tconn, &pi); 418569bc7bc3SAndreas Gruenbacher if (err) 4186b411b363SPhilipp Reisner return 0; 4187b411b363SPhilipp Reisner 418877351055SPhilipp Reisner if (pi.cmd != P_HAND_SHAKE) { 418965d11ed6SPhilipp Reisner conn_err(tconn, "expected HandShake packet, received: %s (0x%04x)\n", 419077351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 4191b411b363SPhilipp Reisner return -1; 4192b411b363SPhilipp Reisner } 4193b411b363SPhilipp Reisner 419477351055SPhilipp Reisner if (pi.size != expect) { 419565d11ed6SPhilipp Reisner conn_err(tconn, "expected HandShake length: %u, received: %u\n", 419677351055SPhilipp Reisner expect, pi.size); 4197b411b363SPhilipp Reisner return -1; 4198b411b363SPhilipp Reisner } 4199b411b363SPhilipp Reisner 420065d11ed6SPhilipp Reisner rv = drbd_recv(tconn, &p->head.payload, expect); 4201b411b363SPhilipp Reisner 4202b411b363SPhilipp Reisner if (rv != expect) { 42030ddc5549SLars Ellenberg if (!signal_pending(current)) 420465d11ed6SPhilipp Reisner conn_warn(tconn, "short read receiving handshake packet: l=%u\n", rv); 4205b411b363SPhilipp Reisner return 0; 4206b411b363SPhilipp Reisner } 4207b411b363SPhilipp Reisner 4208b411b363SPhilipp Reisner p->protocol_min = be32_to_cpu(p->protocol_min); 4209b411b363SPhilipp Reisner p->protocol_max = be32_to_cpu(p->protocol_max); 4210b411b363SPhilipp Reisner if (p->protocol_max == 0) 4211b411b363SPhilipp Reisner p->protocol_max = p->protocol_min; 4212b411b363SPhilipp Reisner 4213b411b363SPhilipp Reisner if (PRO_VERSION_MAX < p->protocol_min || 4214b411b363SPhilipp Reisner PRO_VERSION_MIN > p->protocol_max) 4215b411b363SPhilipp Reisner goto incompat; 4216b411b363SPhilipp Reisner 421765d11ed6SPhilipp Reisner tconn->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); 4218b411b363SPhilipp Reisner 421965d11ed6SPhilipp Reisner conn_info(tconn, "Handshake successful: " 422065d11ed6SPhilipp Reisner "Agreed network protocol version %d\n", tconn->agreed_pro_version); 4221b411b363SPhilipp Reisner 4222b411b363SPhilipp Reisner return 1; 4223b411b363SPhilipp Reisner 4224b411b363SPhilipp Reisner incompat: 422565d11ed6SPhilipp Reisner conn_err(tconn, "incompatible DRBD dialects: " 4226b411b363SPhilipp Reisner "I support %d-%d, peer supports %d-%d\n", 4227b411b363SPhilipp Reisner PRO_VERSION_MIN, PRO_VERSION_MAX, 4228b411b363SPhilipp Reisner p->protocol_min, p->protocol_max); 4229b411b363SPhilipp Reisner return -1; 4230b411b363SPhilipp Reisner } 4231b411b363SPhilipp Reisner 4232b411b363SPhilipp Reisner #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) 423313e6037dSPhilipp Reisner static int drbd_do_auth(struct drbd_tconn *tconn) 4234b411b363SPhilipp Reisner { 4235b411b363SPhilipp Reisner dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); 4236b411b363SPhilipp Reisner dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); 4237b10d96cbSJohannes Thoma return -1; 4238b411b363SPhilipp Reisner } 4239b411b363SPhilipp Reisner #else 4240b411b363SPhilipp Reisner #define CHALLENGE_LEN 64 4241b10d96cbSJohannes Thoma 4242b10d96cbSJohannes Thoma /* Return value: 4243b10d96cbSJohannes Thoma 1 - auth succeeded, 4244b10d96cbSJohannes Thoma 0 - failed, try again (network error), 4245b10d96cbSJohannes Thoma -1 - auth failed, don't try again. 4246b10d96cbSJohannes Thoma */ 4247b10d96cbSJohannes Thoma 424813e6037dSPhilipp Reisner static int drbd_do_auth(struct drbd_tconn *tconn) 4249b411b363SPhilipp Reisner { 4250b411b363SPhilipp Reisner char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ 4251b411b363SPhilipp Reisner struct scatterlist sg; 4252b411b363SPhilipp Reisner char *response = NULL; 4253b411b363SPhilipp Reisner char *right_response = NULL; 4254b411b363SPhilipp Reisner char *peers_ch = NULL; 425513e6037dSPhilipp Reisner unsigned int key_len = strlen(tconn->net_conf->shared_secret); 4256b411b363SPhilipp Reisner unsigned int resp_size; 4257b411b363SPhilipp Reisner struct hash_desc desc; 425877351055SPhilipp Reisner struct packet_info pi; 425969bc7bc3SAndreas Gruenbacher int err, rv; 4260b411b363SPhilipp Reisner 426113e6037dSPhilipp Reisner desc.tfm = tconn->cram_hmac_tfm; 4262b411b363SPhilipp Reisner desc.flags = 0; 4263b411b363SPhilipp Reisner 426413e6037dSPhilipp Reisner rv = crypto_hash_setkey(tconn->cram_hmac_tfm, 426513e6037dSPhilipp Reisner (u8 *)tconn->net_conf->shared_secret, key_len); 4266b411b363SPhilipp Reisner if (rv) { 426713e6037dSPhilipp Reisner conn_err(tconn, "crypto_hash_setkey() failed with %d\n", rv); 4268b10d96cbSJohannes Thoma rv = -1; 4269b411b363SPhilipp Reisner goto fail; 4270b411b363SPhilipp Reisner } 4271b411b363SPhilipp Reisner 4272b411b363SPhilipp Reisner get_random_bytes(my_challenge, CHALLENGE_LEN); 4273b411b363SPhilipp Reisner 4274ce9879cbSAndreas Gruenbacher rv = !conn_send_cmd2(tconn, P_AUTH_CHALLENGE, my_challenge, CHALLENGE_LEN); 4275b411b363SPhilipp Reisner if (!rv) 4276b411b363SPhilipp Reisner goto fail; 4277b411b363SPhilipp Reisner 427869bc7bc3SAndreas Gruenbacher err = drbd_recv_header(tconn, &pi); 427969bc7bc3SAndreas Gruenbacher if (err) { 428069bc7bc3SAndreas Gruenbacher rv = 0; 4281b411b363SPhilipp Reisner goto fail; 428269bc7bc3SAndreas Gruenbacher } 4283b411b363SPhilipp Reisner 428477351055SPhilipp Reisner if (pi.cmd != P_AUTH_CHALLENGE) { 428513e6037dSPhilipp Reisner conn_err(tconn, "expected AuthChallenge packet, received: %s (0x%04x)\n", 428677351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 4287b411b363SPhilipp Reisner rv = 0; 4288b411b363SPhilipp Reisner goto fail; 4289b411b363SPhilipp Reisner } 4290b411b363SPhilipp Reisner 429177351055SPhilipp Reisner if (pi.size > CHALLENGE_LEN * 2) { 429213e6037dSPhilipp Reisner conn_err(tconn, "expected AuthChallenge payload too big.\n"); 4293b10d96cbSJohannes Thoma rv = -1; 4294b411b363SPhilipp Reisner goto fail; 4295b411b363SPhilipp Reisner } 4296b411b363SPhilipp Reisner 429777351055SPhilipp Reisner peers_ch = kmalloc(pi.size, GFP_NOIO); 4298b411b363SPhilipp Reisner if (peers_ch == NULL) { 429913e6037dSPhilipp Reisner conn_err(tconn, "kmalloc of peers_ch failed\n"); 4300b10d96cbSJohannes Thoma rv = -1; 4301b411b363SPhilipp Reisner goto fail; 4302b411b363SPhilipp Reisner } 4303b411b363SPhilipp Reisner 430413e6037dSPhilipp Reisner rv = drbd_recv(tconn, peers_ch, pi.size); 4305b411b363SPhilipp Reisner 430677351055SPhilipp Reisner if (rv != pi.size) { 43070ddc5549SLars Ellenberg if (!signal_pending(current)) 430813e6037dSPhilipp Reisner conn_warn(tconn, "short read AuthChallenge: l=%u\n", rv); 4309b411b363SPhilipp Reisner rv = 0; 4310b411b363SPhilipp Reisner goto fail; 4311b411b363SPhilipp Reisner } 4312b411b363SPhilipp Reisner 431313e6037dSPhilipp Reisner resp_size = crypto_hash_digestsize(tconn->cram_hmac_tfm); 4314b411b363SPhilipp Reisner response = kmalloc(resp_size, GFP_NOIO); 4315b411b363SPhilipp Reisner if (response == NULL) { 431613e6037dSPhilipp Reisner conn_err(tconn, "kmalloc of response failed\n"); 4317b10d96cbSJohannes Thoma rv = -1; 4318b411b363SPhilipp Reisner goto fail; 4319b411b363SPhilipp Reisner } 4320b411b363SPhilipp Reisner 4321b411b363SPhilipp Reisner sg_init_table(&sg, 1); 432277351055SPhilipp Reisner sg_set_buf(&sg, peers_ch, pi.size); 4323b411b363SPhilipp Reisner 4324b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, response); 4325b411b363SPhilipp Reisner if (rv) { 432613e6037dSPhilipp Reisner conn_err(tconn, "crypto_hash_digest() failed with %d\n", rv); 4327b10d96cbSJohannes Thoma rv = -1; 4328b411b363SPhilipp Reisner goto fail; 4329b411b363SPhilipp Reisner } 4330b411b363SPhilipp Reisner 4331ce9879cbSAndreas Gruenbacher rv = !conn_send_cmd2(tconn, P_AUTH_RESPONSE, response, resp_size); 4332b411b363SPhilipp Reisner if (!rv) 4333b411b363SPhilipp Reisner goto fail; 4334b411b363SPhilipp Reisner 433569bc7bc3SAndreas Gruenbacher err = drbd_recv_header(tconn, &pi); 433669bc7bc3SAndreas Gruenbacher if (err) { 433769bc7bc3SAndreas Gruenbacher rv = 0; 4338b411b363SPhilipp Reisner goto fail; 433969bc7bc3SAndreas Gruenbacher } 4340b411b363SPhilipp Reisner 434177351055SPhilipp Reisner if (pi.cmd != P_AUTH_RESPONSE) { 434213e6037dSPhilipp Reisner conn_err(tconn, "expected AuthResponse packet, received: %s (0x%04x)\n", 434377351055SPhilipp Reisner cmdname(pi.cmd), pi.cmd); 4344b411b363SPhilipp Reisner rv = 0; 4345b411b363SPhilipp Reisner goto fail; 4346b411b363SPhilipp Reisner } 4347b411b363SPhilipp Reisner 434877351055SPhilipp Reisner if (pi.size != resp_size) { 434913e6037dSPhilipp Reisner conn_err(tconn, "expected AuthResponse payload of wrong size\n"); 4350b411b363SPhilipp Reisner rv = 0; 4351b411b363SPhilipp Reisner goto fail; 4352b411b363SPhilipp Reisner } 4353b411b363SPhilipp Reisner 435413e6037dSPhilipp Reisner rv = drbd_recv(tconn, response , resp_size); 4355b411b363SPhilipp Reisner 4356b411b363SPhilipp Reisner if (rv != resp_size) { 43570ddc5549SLars Ellenberg if (!signal_pending(current)) 435813e6037dSPhilipp Reisner conn_warn(tconn, "short read receiving AuthResponse: l=%u\n", rv); 4359b411b363SPhilipp Reisner rv = 0; 4360b411b363SPhilipp Reisner goto fail; 4361b411b363SPhilipp Reisner } 4362b411b363SPhilipp Reisner 4363b411b363SPhilipp Reisner right_response = kmalloc(resp_size, GFP_NOIO); 43642d1ee87dSJulia Lawall if (right_response == NULL) { 436513e6037dSPhilipp Reisner conn_err(tconn, "kmalloc of right_response failed\n"); 4366b10d96cbSJohannes Thoma rv = -1; 4367b411b363SPhilipp Reisner goto fail; 4368b411b363SPhilipp Reisner } 4369b411b363SPhilipp Reisner 4370b411b363SPhilipp Reisner sg_set_buf(&sg, my_challenge, CHALLENGE_LEN); 4371b411b363SPhilipp Reisner 4372b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, right_response); 4373b411b363SPhilipp Reisner if (rv) { 437413e6037dSPhilipp Reisner conn_err(tconn, "crypto_hash_digest() failed with %d\n", rv); 4375b10d96cbSJohannes Thoma rv = -1; 4376b411b363SPhilipp Reisner goto fail; 4377b411b363SPhilipp Reisner } 4378b411b363SPhilipp Reisner 4379b411b363SPhilipp Reisner rv = !memcmp(response, right_response, resp_size); 4380b411b363SPhilipp Reisner 4381b411b363SPhilipp Reisner if (rv) 438213e6037dSPhilipp Reisner conn_info(tconn, "Peer authenticated using %d bytes of '%s' HMAC\n", 438313e6037dSPhilipp Reisner resp_size, tconn->net_conf->cram_hmac_alg); 4384b10d96cbSJohannes Thoma else 4385b10d96cbSJohannes Thoma rv = -1; 4386b411b363SPhilipp Reisner 4387b411b363SPhilipp Reisner fail: 4388b411b363SPhilipp Reisner kfree(peers_ch); 4389b411b363SPhilipp Reisner kfree(response); 4390b411b363SPhilipp Reisner kfree(right_response); 4391b411b363SPhilipp Reisner 4392b411b363SPhilipp Reisner return rv; 4393b411b363SPhilipp Reisner } 4394b411b363SPhilipp Reisner #endif 4395b411b363SPhilipp Reisner 4396b411b363SPhilipp Reisner int drbdd_init(struct drbd_thread *thi) 4397b411b363SPhilipp Reisner { 4398392c8801SPhilipp Reisner struct drbd_tconn *tconn = thi->tconn; 4399b411b363SPhilipp Reisner int h; 4400b411b363SPhilipp Reisner 44014d641dd7SPhilipp Reisner conn_info(tconn, "receiver (re)started\n"); 4402b411b363SPhilipp Reisner 4403b411b363SPhilipp Reisner do { 44044d641dd7SPhilipp Reisner h = drbd_connect(tconn); 4405b411b363SPhilipp Reisner if (h == 0) { 44064d641dd7SPhilipp Reisner drbd_disconnect(tconn); 440720ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ); 4408b411b363SPhilipp Reisner } 4409b411b363SPhilipp Reisner if (h == -1) { 44104d641dd7SPhilipp Reisner conn_warn(tconn, "Discarding network configuration.\n"); 4411bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 4412b411b363SPhilipp Reisner } 4413b411b363SPhilipp Reisner } while (h == 0); 4414b411b363SPhilipp Reisner 4415b411b363SPhilipp Reisner if (h > 0) { 44164d641dd7SPhilipp Reisner if (get_net_conf(tconn)) { 44174d641dd7SPhilipp Reisner drbdd(tconn); 44184d641dd7SPhilipp Reisner put_net_conf(tconn); 4419b411b363SPhilipp Reisner } 4420b411b363SPhilipp Reisner } 4421b411b363SPhilipp Reisner 44224d641dd7SPhilipp Reisner drbd_disconnect(tconn); 4423b411b363SPhilipp Reisner 44244d641dd7SPhilipp Reisner conn_info(tconn, "receiver terminated\n"); 4425b411b363SPhilipp Reisner return 0; 4426b411b363SPhilipp Reisner } 4427b411b363SPhilipp Reisner 4428b411b363SPhilipp Reisner /* ********* acknowledge sender ******** */ 4429b411b363SPhilipp Reisner 4430e4f78edeSPhilipp Reisner static int got_conn_RqSReply(struct drbd_tconn *tconn, enum drbd_packet cmd) 4431b411b363SPhilipp Reisner { 4432e4f78edeSPhilipp Reisner struct p_req_state_reply *p = &tconn->meta.rbuf.req_state_reply; 4433b411b363SPhilipp Reisner int retcode = be32_to_cpu(p->retcode); 4434b411b363SPhilipp Reisner 4435fc3b10a4SPhilipp Reisner if (retcode >= SS_SUCCESS) { 4436fc3b10a4SPhilipp Reisner set_bit(CONN_WD_ST_CHG_OKAY, &tconn->flags); 4437fc3b10a4SPhilipp Reisner } else { 4438fc3b10a4SPhilipp Reisner set_bit(CONN_WD_ST_CHG_FAIL, &tconn->flags); 4439fc3b10a4SPhilipp Reisner conn_err(tconn, "Requested state change failed by peer: %s (%d)\n", 4440fc3b10a4SPhilipp Reisner drbd_set_st_err_str(retcode), retcode); 4441fc3b10a4SPhilipp Reisner } 4442fc3b10a4SPhilipp Reisner wake_up(&tconn->ping_wait); 4443e4f78edeSPhilipp Reisner 4444e4f78edeSPhilipp Reisner return true; 4445fc3b10a4SPhilipp Reisner } 4446e4f78edeSPhilipp Reisner 4447e4f78edeSPhilipp Reisner static int got_RqSReply(struct drbd_conf *mdev, enum drbd_packet cmd) 4448e4f78edeSPhilipp Reisner { 4449e4f78edeSPhilipp Reisner struct p_req_state_reply *p = &mdev->tconn->meta.rbuf.req_state_reply; 4450e4f78edeSPhilipp Reisner int retcode = be32_to_cpu(p->retcode); 4451e4f78edeSPhilipp Reisner 4452e4f78edeSPhilipp Reisner if (retcode >= SS_SUCCESS) { 4453e4f78edeSPhilipp Reisner set_bit(CL_ST_CHG_SUCCESS, &mdev->flags); 4454e4f78edeSPhilipp Reisner } else { 4455e4f78edeSPhilipp Reisner set_bit(CL_ST_CHG_FAIL, &mdev->flags); 4456e4f78edeSPhilipp Reisner dev_err(DEV, "Requested state change failed by peer: %s (%d)\n", 4457e4f78edeSPhilipp Reisner drbd_set_st_err_str(retcode), retcode); 4458e4f78edeSPhilipp Reisner } 4459e4f78edeSPhilipp Reisner wake_up(&mdev->state_wait); 4460e4f78edeSPhilipp Reisner 446181e84650SAndreas Gruenbacher return true; 4462b411b363SPhilipp Reisner } 4463b411b363SPhilipp Reisner 4464f19e4f8bSPhilipp Reisner static int got_Ping(struct drbd_tconn *tconn, enum drbd_packet cmd) 4465b411b363SPhilipp Reisner { 4466f19e4f8bSPhilipp Reisner return drbd_send_ping_ack(tconn); 4467b411b363SPhilipp Reisner 4468b411b363SPhilipp Reisner } 4469b411b363SPhilipp Reisner 4470f19e4f8bSPhilipp Reisner static int got_PingAck(struct drbd_tconn *tconn, enum drbd_packet cmd) 4471b411b363SPhilipp Reisner { 4472b411b363SPhilipp Reisner /* restore idle timeout */ 44732a67d8b9SPhilipp Reisner tconn->meta.socket->sk->sk_rcvtimeo = tconn->net_conf->ping_int*HZ; 44742a67d8b9SPhilipp Reisner if (!test_and_set_bit(GOT_PING_ACK, &tconn->flags)) 44752a67d8b9SPhilipp Reisner wake_up(&tconn->ping_wait); 4476b411b363SPhilipp Reisner 447781e84650SAndreas Gruenbacher return true; 4478b411b363SPhilipp Reisner } 4479b411b363SPhilipp Reisner 4480d8763023SAndreas Gruenbacher static int got_IsInSync(struct drbd_conf *mdev, enum drbd_packet cmd) 4481b411b363SPhilipp Reisner { 4482257d0af6SPhilipp Reisner struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack; 4483b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4484b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4485b411b363SPhilipp Reisner 448631890f4aSPhilipp Reisner D_ASSERT(mdev->tconn->agreed_pro_version >= 89); 4487b411b363SPhilipp Reisner 4488b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4489b411b363SPhilipp Reisner 44901d53f09eSLars Ellenberg if (get_ldev(mdev)) { 4491b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4492b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4493b411b363SPhilipp Reisner /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ 4494b411b363SPhilipp Reisner mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); 44951d53f09eSLars Ellenberg put_ldev(mdev); 44961d53f09eSLars Ellenberg } 4497b411b363SPhilipp Reisner dec_rs_pending(mdev); 4498778f271dSPhilipp Reisner atomic_add(blksize >> 9, &mdev->rs_sect_in); 4499b411b363SPhilipp Reisner 450081e84650SAndreas Gruenbacher return true; 4501b411b363SPhilipp Reisner } 4502b411b363SPhilipp Reisner 4503bc9c5c41SAndreas Gruenbacher static int 4504bc9c5c41SAndreas Gruenbacher validate_req_change_req_state(struct drbd_conf *mdev, u64 id, sector_t sector, 4505bc9c5c41SAndreas Gruenbacher struct rb_root *root, const char *func, 4506bc9c5c41SAndreas Gruenbacher enum drbd_req_event what, bool missing_ok) 4507b411b363SPhilipp Reisner { 4508b411b363SPhilipp Reisner struct drbd_request *req; 4509b411b363SPhilipp Reisner struct bio_and_error m; 4510b411b363SPhilipp Reisner 451187eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 4512bc9c5c41SAndreas Gruenbacher req = find_request(mdev, root, id, sector, missing_ok, func); 4513b411b363SPhilipp Reisner if (unlikely(!req)) { 451487eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 451581e84650SAndreas Gruenbacher return false; 4516b411b363SPhilipp Reisner } 4517b411b363SPhilipp Reisner __req_mod(req, what, &m); 451887eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 4519b411b363SPhilipp Reisner 4520b411b363SPhilipp Reisner if (m.bio) 4521b411b363SPhilipp Reisner complete_master_bio(mdev, &m); 452281e84650SAndreas Gruenbacher return true; 4523b411b363SPhilipp Reisner } 4524b411b363SPhilipp Reisner 4525d8763023SAndreas Gruenbacher static int got_BlockAck(struct drbd_conf *mdev, enum drbd_packet cmd) 4526b411b363SPhilipp Reisner { 4527257d0af6SPhilipp Reisner struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack; 4528b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4529b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4530b411b363SPhilipp Reisner enum drbd_req_event what; 4531b411b363SPhilipp Reisner 4532b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4533b411b363SPhilipp Reisner 4534579b57edSAndreas Gruenbacher if (p->block_id == ID_SYNCER) { 4535b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4536b411b363SPhilipp Reisner dec_rs_pending(mdev); 453781e84650SAndreas Gruenbacher return true; 4538b411b363SPhilipp Reisner } 4539257d0af6SPhilipp Reisner switch (cmd) { 4540b411b363SPhilipp Reisner case P_RS_WRITE_ACK: 454189e58e75SPhilipp Reisner D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C); 45428554df1cSAndreas Gruenbacher what = WRITE_ACKED_BY_PEER_AND_SIS; 4543b411b363SPhilipp Reisner break; 4544b411b363SPhilipp Reisner case P_WRITE_ACK: 454589e58e75SPhilipp Reisner D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C); 45468554df1cSAndreas Gruenbacher what = WRITE_ACKED_BY_PEER; 4547b411b363SPhilipp Reisner break; 4548b411b363SPhilipp Reisner case P_RECV_ACK: 454989e58e75SPhilipp Reisner D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_B); 45508554df1cSAndreas Gruenbacher what = RECV_ACKED_BY_PEER; 4551b411b363SPhilipp Reisner break; 45527be8da07SAndreas Gruenbacher case P_DISCARD_WRITE: 455389e58e75SPhilipp Reisner D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C); 45547be8da07SAndreas Gruenbacher what = DISCARD_WRITE; 45557be8da07SAndreas Gruenbacher break; 45567be8da07SAndreas Gruenbacher case P_RETRY_WRITE: 45577be8da07SAndreas Gruenbacher D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C); 45587be8da07SAndreas Gruenbacher what = POSTPONE_WRITE; 4559b411b363SPhilipp Reisner break; 4560b411b363SPhilipp Reisner default: 4561b411b363SPhilipp Reisner D_ASSERT(0); 456281e84650SAndreas Gruenbacher return false; 4563b411b363SPhilipp Reisner } 4564b411b363SPhilipp Reisner 4565b411b363SPhilipp Reisner return validate_req_change_req_state(mdev, p->block_id, sector, 4566bc9c5c41SAndreas Gruenbacher &mdev->write_requests, __func__, 4567bc9c5c41SAndreas Gruenbacher what, false); 4568b411b363SPhilipp Reisner } 4569b411b363SPhilipp Reisner 4570d8763023SAndreas Gruenbacher static int got_NegAck(struct drbd_conf *mdev, enum drbd_packet cmd) 4571b411b363SPhilipp Reisner { 4572257d0af6SPhilipp Reisner struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack; 4573b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 45742deb8336SPhilipp Reisner int size = be32_to_cpu(p->blksize); 457589e58e75SPhilipp Reisner bool missing_ok = mdev->tconn->net_conf->wire_protocol == DRBD_PROT_A || 457689e58e75SPhilipp Reisner mdev->tconn->net_conf->wire_protocol == DRBD_PROT_B; 4577c3afd8f5SAndreas Gruenbacher bool found; 4578b411b363SPhilipp Reisner 4579b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4580b411b363SPhilipp Reisner 4581579b57edSAndreas Gruenbacher if (p->block_id == ID_SYNCER) { 4582b411b363SPhilipp Reisner dec_rs_pending(mdev); 4583b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 458481e84650SAndreas Gruenbacher return true; 4585b411b363SPhilipp Reisner } 45862deb8336SPhilipp Reisner 4587c3afd8f5SAndreas Gruenbacher found = validate_req_change_req_state(mdev, p->block_id, sector, 4588bc9c5c41SAndreas Gruenbacher &mdev->write_requests, __func__, 45898554df1cSAndreas Gruenbacher NEG_ACKED, missing_ok); 4590c3afd8f5SAndreas Gruenbacher if (!found) { 45912deb8336SPhilipp Reisner /* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs. 45922deb8336SPhilipp Reisner The master bio might already be completed, therefore the 4593c3afd8f5SAndreas Gruenbacher request is no longer in the collision hash. */ 45942deb8336SPhilipp Reisner /* In Protocol B we might already have got a P_RECV_ACK 45952deb8336SPhilipp Reisner but then get a P_NEG_ACK afterwards. */ 4596c3afd8f5SAndreas Gruenbacher if (!missing_ok) 45972deb8336SPhilipp Reisner return false; 4598c3afd8f5SAndreas Gruenbacher drbd_set_out_of_sync(mdev, sector, size); 45992deb8336SPhilipp Reisner } 46002deb8336SPhilipp Reisner return true; 4601b411b363SPhilipp Reisner } 4602b411b363SPhilipp Reisner 4603d8763023SAndreas Gruenbacher static int got_NegDReply(struct drbd_conf *mdev, enum drbd_packet cmd) 4604b411b363SPhilipp Reisner { 4605257d0af6SPhilipp Reisner struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack; 4606b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4607b411b363SPhilipp Reisner 4608b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 46097be8da07SAndreas Gruenbacher 4610b411b363SPhilipp Reisner dev_err(DEV, "Got NegDReply; Sector %llus, len %u; Fail original request.\n", 4611b411b363SPhilipp Reisner (unsigned long long)sector, be32_to_cpu(p->blksize)); 4612b411b363SPhilipp Reisner 4613b411b363SPhilipp Reisner return validate_req_change_req_state(mdev, p->block_id, sector, 4614bc9c5c41SAndreas Gruenbacher &mdev->read_requests, __func__, 46158554df1cSAndreas Gruenbacher NEG_ACKED, false); 4616b411b363SPhilipp Reisner } 4617b411b363SPhilipp Reisner 4618d8763023SAndreas Gruenbacher static int got_NegRSDReply(struct drbd_conf *mdev, enum drbd_packet cmd) 4619b411b363SPhilipp Reisner { 4620b411b363SPhilipp Reisner sector_t sector; 4621b411b363SPhilipp Reisner int size; 4622257d0af6SPhilipp Reisner struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack; 4623b411b363SPhilipp Reisner 4624b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4625b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4626b411b363SPhilipp Reisner 4627b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4628b411b363SPhilipp Reisner 4629b411b363SPhilipp Reisner dec_rs_pending(mdev); 4630b411b363SPhilipp Reisner 4631b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_FAILED)) { 4632b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4633257d0af6SPhilipp Reisner switch (cmd) { 4634d612d309SPhilipp Reisner case P_NEG_RS_DREPLY: 4635b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 4636d612d309SPhilipp Reisner case P_RS_CANCEL: 4637d612d309SPhilipp Reisner break; 4638d612d309SPhilipp Reisner default: 4639d612d309SPhilipp Reisner D_ASSERT(0); 4640d612d309SPhilipp Reisner put_ldev(mdev); 4641d612d309SPhilipp Reisner return false; 4642d612d309SPhilipp Reisner } 4643b411b363SPhilipp Reisner put_ldev(mdev); 4644b411b363SPhilipp Reisner } 4645b411b363SPhilipp Reisner 464681e84650SAndreas Gruenbacher return true; 4647b411b363SPhilipp Reisner } 4648b411b363SPhilipp Reisner 4649d8763023SAndreas Gruenbacher static int got_BarrierAck(struct drbd_conf *mdev, enum drbd_packet cmd) 4650b411b363SPhilipp Reisner { 4651257d0af6SPhilipp Reisner struct p_barrier_ack *p = &mdev->tconn->meta.rbuf.barrier_ack; 4652b411b363SPhilipp Reisner 46532f5cdd0bSPhilipp Reisner tl_release(mdev->tconn, p->barrier, be32_to_cpu(p->set_size)); 4654b411b363SPhilipp Reisner 4655c4752ef1SPhilipp Reisner if (mdev->state.conn == C_AHEAD && 4656c4752ef1SPhilipp Reisner atomic_read(&mdev->ap_in_flight) == 0 && 4657370a43e7SPhilipp Reisner !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &mdev->current_epoch->flags)) { 4658370a43e7SPhilipp Reisner mdev->start_resync_timer.expires = jiffies + HZ; 4659370a43e7SPhilipp Reisner add_timer(&mdev->start_resync_timer); 4660c4752ef1SPhilipp Reisner } 4661c4752ef1SPhilipp Reisner 466281e84650SAndreas Gruenbacher return true; 4663b411b363SPhilipp Reisner } 4664b411b363SPhilipp Reisner 4665d8763023SAndreas Gruenbacher static int got_OVResult(struct drbd_conf *mdev, enum drbd_packet cmd) 4666b411b363SPhilipp Reisner { 4667257d0af6SPhilipp Reisner struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack; 4668b411b363SPhilipp Reisner struct drbd_work *w; 4669b411b363SPhilipp Reisner sector_t sector; 4670b411b363SPhilipp Reisner int size; 4671b411b363SPhilipp Reisner 4672b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4673b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4674b411b363SPhilipp Reisner 4675b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4676b411b363SPhilipp Reisner 4677b411b363SPhilipp Reisner if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) 4678b411b363SPhilipp Reisner drbd_ov_oos_found(mdev, sector, size); 4679b411b363SPhilipp Reisner else 4680b411b363SPhilipp Reisner ov_oos_print(mdev); 4681b411b363SPhilipp Reisner 46821d53f09eSLars Ellenberg if (!get_ldev(mdev)) 468381e84650SAndreas Gruenbacher return true; 46841d53f09eSLars Ellenberg 4685b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4686b411b363SPhilipp Reisner dec_rs_pending(mdev); 4687b411b363SPhilipp Reisner 4688ea5442afSLars Ellenberg --mdev->ov_left; 4689ea5442afSLars Ellenberg 4690ea5442afSLars Ellenberg /* let's advance progress step marks only for every other megabyte */ 4691ea5442afSLars Ellenberg if ((mdev->ov_left & 0x200) == 0x200) 4692ea5442afSLars Ellenberg drbd_advance_rs_marks(mdev, mdev->ov_left); 4693ea5442afSLars Ellenberg 4694ea5442afSLars Ellenberg if (mdev->ov_left == 0) { 4695b411b363SPhilipp Reisner w = kmalloc(sizeof(*w), GFP_NOIO); 4696b411b363SPhilipp Reisner if (w) { 4697b411b363SPhilipp Reisner w->cb = w_ov_finished; 4698a21e9298SPhilipp Reisner w->mdev = mdev; 4699e42325a5SPhilipp Reisner drbd_queue_work_front(&mdev->tconn->data.work, w); 4700b411b363SPhilipp Reisner } else { 4701b411b363SPhilipp Reisner dev_err(DEV, "kmalloc(w) failed."); 4702b411b363SPhilipp Reisner ov_oos_print(mdev); 4703b411b363SPhilipp Reisner drbd_resync_finished(mdev); 4704b411b363SPhilipp Reisner } 4705b411b363SPhilipp Reisner } 47061d53f09eSLars Ellenberg put_ldev(mdev); 470781e84650SAndreas Gruenbacher return true; 4708b411b363SPhilipp Reisner } 4709b411b363SPhilipp Reisner 4710d8763023SAndreas Gruenbacher static int got_skip(struct drbd_conf *mdev, enum drbd_packet cmd) 47110ced55a3SPhilipp Reisner { 471281e84650SAndreas Gruenbacher return true; 47130ced55a3SPhilipp Reisner } 47140ced55a3SPhilipp Reisner 471532862ec7SPhilipp Reisner static int tconn_process_done_ee(struct drbd_tconn *tconn) 471632862ec7SPhilipp Reisner { 4717082a3439SPhilipp Reisner struct drbd_conf *mdev; 4718082a3439SPhilipp Reisner int i, not_empty = 0; 471932862ec7SPhilipp Reisner 472032862ec7SPhilipp Reisner do { 472132862ec7SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &tconn->flags); 472232862ec7SPhilipp Reisner flush_signals(current); 4723082a3439SPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, i) { 4724e2b3032bSAndreas Gruenbacher if (drbd_process_done_ee(mdev)) 4725082a3439SPhilipp Reisner return 1; /* error */ 4726082a3439SPhilipp Reisner } 472732862ec7SPhilipp Reisner set_bit(SIGNAL_ASENDER, &tconn->flags); 4728082a3439SPhilipp Reisner 4729082a3439SPhilipp Reisner spin_lock_irq(&tconn->req_lock); 4730082a3439SPhilipp Reisner idr_for_each_entry(&tconn->volumes, mdev, i) { 4731082a3439SPhilipp Reisner not_empty = !list_empty(&mdev->done_ee); 4732082a3439SPhilipp Reisner if (not_empty) 4733082a3439SPhilipp Reisner break; 4734082a3439SPhilipp Reisner } 4735082a3439SPhilipp Reisner spin_unlock_irq(&tconn->req_lock); 473632862ec7SPhilipp Reisner } while (not_empty); 473732862ec7SPhilipp Reisner 473832862ec7SPhilipp Reisner return 0; 473932862ec7SPhilipp Reisner } 474032862ec7SPhilipp Reisner 47417201b972SAndreas Gruenbacher struct asender_cmd { 47427201b972SAndreas Gruenbacher size_t pkt_size; 4743a4fbda8eSPhilipp Reisner enum mdev_or_conn fa_type; /* first argument's type */ 4744a4fbda8eSPhilipp Reisner union { 4745a4fbda8eSPhilipp Reisner int (*mdev_fn)(struct drbd_conf *mdev, enum drbd_packet cmd); 4746a4fbda8eSPhilipp Reisner int (*conn_fn)(struct drbd_tconn *tconn, enum drbd_packet cmd); 4747a4fbda8eSPhilipp Reisner }; 47487201b972SAndreas Gruenbacher }; 47497201b972SAndreas Gruenbacher 47507201b972SAndreas Gruenbacher static struct asender_cmd asender_tbl[] = { 4751f19e4f8bSPhilipp Reisner [P_PING] = { sizeof(struct p_header), CONN, { .conn_fn = got_Ping } }, 4752f19e4f8bSPhilipp Reisner [P_PING_ACK] = { sizeof(struct p_header), CONN, { .conn_fn = got_PingAck } }, 4753a4fbda8eSPhilipp Reisner [P_RECV_ACK] = { sizeof(struct p_block_ack), MDEV, { got_BlockAck } }, 4754a4fbda8eSPhilipp Reisner [P_WRITE_ACK] = { sizeof(struct p_block_ack), MDEV, { got_BlockAck } }, 4755a4fbda8eSPhilipp Reisner [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), MDEV, { got_BlockAck } }, 4756a4fbda8eSPhilipp Reisner [P_DISCARD_WRITE] = { sizeof(struct p_block_ack), MDEV, { got_BlockAck } }, 4757a4fbda8eSPhilipp Reisner [P_NEG_ACK] = { sizeof(struct p_block_ack), MDEV, { got_NegAck } }, 4758a4fbda8eSPhilipp Reisner [P_NEG_DREPLY] = { sizeof(struct p_block_ack), MDEV, { got_NegDReply } }, 4759a4fbda8eSPhilipp Reisner [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), MDEV, { got_NegRSDReply } }, 4760a4fbda8eSPhilipp Reisner [P_OV_RESULT] = { sizeof(struct p_block_ack), MDEV, { got_OVResult } }, 4761a4fbda8eSPhilipp Reisner [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), MDEV, { got_BarrierAck } }, 4762a4fbda8eSPhilipp Reisner [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), MDEV, { got_RqSReply } }, 4763a4fbda8eSPhilipp Reisner [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), MDEV, { got_IsInSync } }, 4764a4fbda8eSPhilipp Reisner [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), MDEV, { got_skip } }, 4765a4fbda8eSPhilipp Reisner [P_RS_CANCEL] = { sizeof(struct p_block_ack), MDEV, { got_NegRSDReply } }, 4766e4f78edeSPhilipp Reisner [P_CONN_ST_CHG_REPLY]={ sizeof(struct p_req_state_reply), CONN, {.conn_fn = got_conn_RqSReply}}, 4767a4fbda8eSPhilipp Reisner [P_RETRY_WRITE] = { sizeof(struct p_block_ack), MDEV, { got_BlockAck } }, 47687201b972SAndreas Gruenbacher }; 47697201b972SAndreas Gruenbacher 4770b411b363SPhilipp Reisner int drbd_asender(struct drbd_thread *thi) 4771b411b363SPhilipp Reisner { 4772392c8801SPhilipp Reisner struct drbd_tconn *tconn = thi->tconn; 477332862ec7SPhilipp Reisner struct p_header *h = &tconn->meta.rbuf.header; 4774b411b363SPhilipp Reisner struct asender_cmd *cmd = NULL; 477577351055SPhilipp Reisner struct packet_info pi; 4776257d0af6SPhilipp Reisner int rv; 4777b411b363SPhilipp Reisner void *buf = h; 4778b411b363SPhilipp Reisner int received = 0; 4779257d0af6SPhilipp Reisner int expect = sizeof(struct p_header); 4780f36af18cSLars Ellenberg int ping_timeout_active = 0; 4781b411b363SPhilipp Reisner 4782b411b363SPhilipp Reisner current->policy = SCHED_RR; /* Make this a realtime task! */ 4783b411b363SPhilipp Reisner current->rt_priority = 2; /* more important than all other tasks */ 4784b411b363SPhilipp Reisner 4785e77a0a5cSAndreas Gruenbacher while (get_t_state(thi) == RUNNING) { 478680822284SPhilipp Reisner drbd_thread_current_set_cpu(thi); 478732862ec7SPhilipp Reisner if (test_and_clear_bit(SEND_PING, &tconn->flags)) { 47882a67d8b9SPhilipp Reisner if (!drbd_send_ping(tconn)) { 478932862ec7SPhilipp Reisner conn_err(tconn, "drbd_send_ping has failed\n"); 4790841ce241SAndreas Gruenbacher goto reconnect; 4791841ce241SAndreas Gruenbacher } 479232862ec7SPhilipp Reisner tconn->meta.socket->sk->sk_rcvtimeo = 479332862ec7SPhilipp Reisner tconn->net_conf->ping_timeo*HZ/10; 4794f36af18cSLars Ellenberg ping_timeout_active = 1; 4795b411b363SPhilipp Reisner } 4796b411b363SPhilipp Reisner 479732862ec7SPhilipp Reisner /* TODO: conditionally cork; it may hurt latency if we cork without 479832862ec7SPhilipp Reisner much to send */ 479932862ec7SPhilipp Reisner if (!tconn->net_conf->no_cork) 480032862ec7SPhilipp Reisner drbd_tcp_cork(tconn->meta.socket); 4801082a3439SPhilipp Reisner if (tconn_process_done_ee(tconn)) { 4802082a3439SPhilipp Reisner conn_err(tconn, "tconn_process_done_ee() failed\n"); 4803b411b363SPhilipp Reisner goto reconnect; 4804082a3439SPhilipp Reisner } 4805b411b363SPhilipp Reisner /* but unconditionally uncork unless disabled */ 480632862ec7SPhilipp Reisner if (!tconn->net_conf->no_cork) 480732862ec7SPhilipp Reisner drbd_tcp_uncork(tconn->meta.socket); 4808b411b363SPhilipp Reisner 4809b411b363SPhilipp Reisner /* short circuit, recv_msg would return EINTR anyways. */ 4810b411b363SPhilipp Reisner if (signal_pending(current)) 4811b411b363SPhilipp Reisner continue; 4812b411b363SPhilipp Reisner 481332862ec7SPhilipp Reisner rv = drbd_recv_short(tconn->meta.socket, buf, expect-received, 0); 481432862ec7SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &tconn->flags); 4815b411b363SPhilipp Reisner 4816b411b363SPhilipp Reisner flush_signals(current); 4817b411b363SPhilipp Reisner 4818b411b363SPhilipp Reisner /* Note: 4819b411b363SPhilipp Reisner * -EINTR (on meta) we got a signal 4820b411b363SPhilipp Reisner * -EAGAIN (on meta) rcvtimeo expired 4821b411b363SPhilipp Reisner * -ECONNRESET other side closed the connection 4822b411b363SPhilipp Reisner * -ERESTARTSYS (on data) we got a signal 4823b411b363SPhilipp Reisner * rv < 0 other than above: unexpected error! 4824b411b363SPhilipp Reisner * rv == expected: full header or command 4825b411b363SPhilipp Reisner * rv < expected: "woken" by signal during receive 4826b411b363SPhilipp Reisner * rv == 0 : "connection shut down by peer" 4827b411b363SPhilipp Reisner */ 4828b411b363SPhilipp Reisner if (likely(rv > 0)) { 4829b411b363SPhilipp Reisner received += rv; 4830b411b363SPhilipp Reisner buf += rv; 4831b411b363SPhilipp Reisner } else if (rv == 0) { 483232862ec7SPhilipp Reisner conn_err(tconn, "meta connection shut down by peer.\n"); 4833b411b363SPhilipp Reisner goto reconnect; 4834b411b363SPhilipp Reisner } else if (rv == -EAGAIN) { 4835cb6518cbSLars Ellenberg /* If the data socket received something meanwhile, 4836cb6518cbSLars Ellenberg * that is good enough: peer is still alive. */ 483732862ec7SPhilipp Reisner if (time_after(tconn->last_received, 483832862ec7SPhilipp Reisner jiffies - tconn->meta.socket->sk->sk_rcvtimeo)) 4839cb6518cbSLars Ellenberg continue; 4840f36af18cSLars Ellenberg if (ping_timeout_active) { 484132862ec7SPhilipp Reisner conn_err(tconn, "PingAck did not arrive in time.\n"); 4842b411b363SPhilipp Reisner goto reconnect; 4843b411b363SPhilipp Reisner } 484432862ec7SPhilipp Reisner set_bit(SEND_PING, &tconn->flags); 4845b411b363SPhilipp Reisner continue; 4846b411b363SPhilipp Reisner } else if (rv == -EINTR) { 4847b411b363SPhilipp Reisner continue; 4848b411b363SPhilipp Reisner } else { 484932862ec7SPhilipp Reisner conn_err(tconn, "sock_recvmsg returned %d\n", rv); 4850b411b363SPhilipp Reisner goto reconnect; 4851b411b363SPhilipp Reisner } 4852b411b363SPhilipp Reisner 4853b411b363SPhilipp Reisner if (received == expect && cmd == NULL) { 48548172f3e9SAndreas Gruenbacher if (decode_header(tconn, h, &pi)) 4855b411b363SPhilipp Reisner goto reconnect; 48567201b972SAndreas Gruenbacher cmd = &asender_tbl[pi.cmd]; 48577201b972SAndreas Gruenbacher if (pi.cmd >= ARRAY_SIZE(asender_tbl) || !cmd) { 485832862ec7SPhilipp Reisner conn_err(tconn, "unknown command %d on meta (l: %d)\n", 485977351055SPhilipp Reisner pi.cmd, pi.size); 4860b411b363SPhilipp Reisner goto disconnect; 4861b411b363SPhilipp Reisner } 4862b411b363SPhilipp Reisner expect = cmd->pkt_size; 486377351055SPhilipp Reisner if (pi.size != expect - sizeof(struct p_header)) { 486432862ec7SPhilipp Reisner conn_err(tconn, "Wrong packet size on meta (c: %d, l: %d)\n", 486577351055SPhilipp Reisner pi.cmd, pi.size); 4866b411b363SPhilipp Reisner goto reconnect; 4867b411b363SPhilipp Reisner } 4868257d0af6SPhilipp Reisner } 4869b411b363SPhilipp Reisner if (received == expect) { 4870a4fbda8eSPhilipp Reisner bool rv; 4871a4fbda8eSPhilipp Reisner 4872a4fbda8eSPhilipp Reisner if (cmd->fa_type == CONN) { 4873a4fbda8eSPhilipp Reisner rv = cmd->conn_fn(tconn, pi.cmd); 4874a4fbda8eSPhilipp Reisner } else { 4875a4fbda8eSPhilipp Reisner struct drbd_conf *mdev = vnr_to_mdev(tconn, pi.vnr); 4876a4fbda8eSPhilipp Reisner rv = cmd->mdev_fn(mdev, pi.cmd); 4877a4fbda8eSPhilipp Reisner } 4878a4fbda8eSPhilipp Reisner 4879a4fbda8eSPhilipp Reisner if (!rv) 4880b411b363SPhilipp Reisner goto reconnect; 4881b411b363SPhilipp Reisner 4882a4fbda8eSPhilipp Reisner tconn->last_received = jiffies; 4883a4fbda8eSPhilipp Reisner 4884f36af18cSLars Ellenberg /* the idle_timeout (ping-int) 4885f36af18cSLars Ellenberg * has been restored in got_PingAck() */ 48867201b972SAndreas Gruenbacher if (cmd == &asender_tbl[P_PING_ACK]) 4887f36af18cSLars Ellenberg ping_timeout_active = 0; 4888f36af18cSLars Ellenberg 4889b411b363SPhilipp Reisner buf = h; 4890b411b363SPhilipp Reisner received = 0; 4891257d0af6SPhilipp Reisner expect = sizeof(struct p_header); 4892b411b363SPhilipp Reisner cmd = NULL; 4893b411b363SPhilipp Reisner } 4894b411b363SPhilipp Reisner } 4895b411b363SPhilipp Reisner 4896b411b363SPhilipp Reisner if (0) { 4897b411b363SPhilipp Reisner reconnect: 4898bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_NETWORK_FAILURE), CS_HARD); 4899b411b363SPhilipp Reisner } 4900b411b363SPhilipp Reisner if (0) { 4901b411b363SPhilipp Reisner disconnect: 4902bbeb641cSPhilipp Reisner conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); 4903b411b363SPhilipp Reisner } 490432862ec7SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &tconn->flags); 4905b411b363SPhilipp Reisner 490632862ec7SPhilipp Reisner conn_info(tconn, "asender terminated\n"); 4907b411b363SPhilipp Reisner 4908b411b363SPhilipp Reisner return 0; 4909b411b363SPhilipp Reisner } 4910