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 51b411b363SPhilipp Reisner enum finish_epoch { 52b411b363SPhilipp Reisner FE_STILL_LIVE, 53b411b363SPhilipp Reisner FE_DESTROYED, 54b411b363SPhilipp Reisner FE_RECYCLED, 55b411b363SPhilipp Reisner }; 56b411b363SPhilipp Reisner 57b411b363SPhilipp Reisner static int drbd_do_handshake(struct drbd_conf *mdev); 58b411b363SPhilipp Reisner static int drbd_do_auth(struct drbd_conf *mdev); 59b411b363SPhilipp Reisner 60b411b363SPhilipp Reisner static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *, struct drbd_epoch *, enum epoch_event); 61b411b363SPhilipp Reisner static int e_end_block(struct drbd_conf *, struct drbd_work *, int); 62b411b363SPhilipp Reisner 63b411b363SPhilipp Reisner 64b411b363SPhilipp Reisner #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) 65b411b363SPhilipp Reisner 6645bb912bSLars Ellenberg /* 6745bb912bSLars Ellenberg * some helper functions to deal with single linked page lists, 6845bb912bSLars Ellenberg * page->private being our "next" pointer. 6945bb912bSLars Ellenberg */ 7045bb912bSLars Ellenberg 7145bb912bSLars Ellenberg /* If at least n pages are linked at head, get n pages off. 7245bb912bSLars Ellenberg * Otherwise, don't modify head, and return NULL. 7345bb912bSLars Ellenberg * Locking is the responsibility of the caller. 7445bb912bSLars Ellenberg */ 7545bb912bSLars Ellenberg static struct page *page_chain_del(struct page **head, int n) 7645bb912bSLars Ellenberg { 7745bb912bSLars Ellenberg struct page *page; 7845bb912bSLars Ellenberg struct page *tmp; 7945bb912bSLars Ellenberg 8045bb912bSLars Ellenberg BUG_ON(!n); 8145bb912bSLars Ellenberg BUG_ON(!head); 8245bb912bSLars Ellenberg 8345bb912bSLars Ellenberg page = *head; 8423ce4227SPhilipp Reisner 8523ce4227SPhilipp Reisner if (!page) 8623ce4227SPhilipp Reisner return NULL; 8723ce4227SPhilipp Reisner 8845bb912bSLars Ellenberg while (page) { 8945bb912bSLars Ellenberg tmp = page_chain_next(page); 9045bb912bSLars Ellenberg if (--n == 0) 9145bb912bSLars Ellenberg break; /* found sufficient pages */ 9245bb912bSLars Ellenberg if (tmp == NULL) 9345bb912bSLars Ellenberg /* insufficient pages, don't use any of them. */ 9445bb912bSLars Ellenberg return NULL; 9545bb912bSLars Ellenberg page = tmp; 9645bb912bSLars Ellenberg } 9745bb912bSLars Ellenberg 9845bb912bSLars Ellenberg /* add end of list marker for the returned list */ 9945bb912bSLars Ellenberg set_page_private(page, 0); 10045bb912bSLars Ellenberg /* actual return value, and adjustment of head */ 10145bb912bSLars Ellenberg page = *head; 10245bb912bSLars Ellenberg *head = tmp; 10345bb912bSLars Ellenberg return page; 10445bb912bSLars Ellenberg } 10545bb912bSLars Ellenberg 10645bb912bSLars Ellenberg /* may be used outside of locks to find the tail of a (usually short) 10745bb912bSLars Ellenberg * "private" page chain, before adding it back to a global chain head 10845bb912bSLars Ellenberg * with page_chain_add() under a spinlock. */ 10945bb912bSLars Ellenberg static struct page *page_chain_tail(struct page *page, int *len) 11045bb912bSLars Ellenberg { 11145bb912bSLars Ellenberg struct page *tmp; 11245bb912bSLars Ellenberg int i = 1; 11345bb912bSLars Ellenberg while ((tmp = page_chain_next(page))) 11445bb912bSLars Ellenberg ++i, page = tmp; 11545bb912bSLars Ellenberg if (len) 11645bb912bSLars Ellenberg *len = i; 11745bb912bSLars Ellenberg return page; 11845bb912bSLars Ellenberg } 11945bb912bSLars Ellenberg 12045bb912bSLars Ellenberg static int page_chain_free(struct page *page) 12145bb912bSLars Ellenberg { 12245bb912bSLars Ellenberg struct page *tmp; 12345bb912bSLars Ellenberg int i = 0; 12445bb912bSLars Ellenberg page_chain_for_each_safe(page, tmp) { 12545bb912bSLars Ellenberg put_page(page); 12645bb912bSLars Ellenberg ++i; 12745bb912bSLars Ellenberg } 12845bb912bSLars Ellenberg return i; 12945bb912bSLars Ellenberg } 13045bb912bSLars Ellenberg 13145bb912bSLars Ellenberg static void page_chain_add(struct page **head, 13245bb912bSLars Ellenberg struct page *chain_first, struct page *chain_last) 13345bb912bSLars Ellenberg { 13445bb912bSLars Ellenberg #if 1 13545bb912bSLars Ellenberg struct page *tmp; 13645bb912bSLars Ellenberg tmp = page_chain_tail(chain_first, NULL); 13745bb912bSLars Ellenberg BUG_ON(tmp != chain_last); 13845bb912bSLars Ellenberg #endif 13945bb912bSLars Ellenberg 14045bb912bSLars Ellenberg /* add chain to head */ 14145bb912bSLars Ellenberg set_page_private(chain_last, (unsigned long)*head); 14245bb912bSLars Ellenberg *head = chain_first; 14345bb912bSLars Ellenberg } 14445bb912bSLars Ellenberg 14545bb912bSLars Ellenberg static struct page *drbd_pp_first_pages_or_try_alloc(struct drbd_conf *mdev, int number) 146b411b363SPhilipp Reisner { 147b411b363SPhilipp Reisner struct page *page = NULL; 14845bb912bSLars Ellenberg struct page *tmp = NULL; 14945bb912bSLars Ellenberg int i = 0; 150b411b363SPhilipp Reisner 151b411b363SPhilipp Reisner /* Yes, testing drbd_pp_vacant outside the lock is racy. 152b411b363SPhilipp Reisner * So what. It saves a spin_lock. */ 15345bb912bSLars Ellenberg if (drbd_pp_vacant >= number) { 154b411b363SPhilipp Reisner spin_lock(&drbd_pp_lock); 15545bb912bSLars Ellenberg page = page_chain_del(&drbd_pp_pool, number); 15645bb912bSLars Ellenberg if (page) 15745bb912bSLars Ellenberg drbd_pp_vacant -= number; 158b411b363SPhilipp Reisner spin_unlock(&drbd_pp_lock); 15945bb912bSLars Ellenberg if (page) 16045bb912bSLars Ellenberg return page; 161b411b363SPhilipp Reisner } 16245bb912bSLars Ellenberg 163b411b363SPhilipp Reisner /* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD 164b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 165b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 16645bb912bSLars Ellenberg for (i = 0; i < number; i++) { 16745bb912bSLars Ellenberg tmp = alloc_page(GFP_TRY); 16845bb912bSLars Ellenberg if (!tmp) 16945bb912bSLars Ellenberg break; 17045bb912bSLars Ellenberg set_page_private(tmp, (unsigned long)page); 17145bb912bSLars Ellenberg page = tmp; 17245bb912bSLars Ellenberg } 17345bb912bSLars Ellenberg 17445bb912bSLars Ellenberg if (i == number) 175b411b363SPhilipp Reisner return page; 17645bb912bSLars Ellenberg 17745bb912bSLars Ellenberg /* Not enough pages immediately available this time. 17845bb912bSLars Ellenberg * No need to jump around here, drbd_pp_alloc will retry this 17945bb912bSLars Ellenberg * function "soon". */ 18045bb912bSLars Ellenberg if (page) { 18145bb912bSLars Ellenberg tmp = page_chain_tail(page, NULL); 18245bb912bSLars Ellenberg spin_lock(&drbd_pp_lock); 18345bb912bSLars Ellenberg page_chain_add(&drbd_pp_pool, page, tmp); 18445bb912bSLars Ellenberg drbd_pp_vacant += i; 18545bb912bSLars Ellenberg spin_unlock(&drbd_pp_lock); 18645bb912bSLars Ellenberg } 18745bb912bSLars Ellenberg return NULL; 188b411b363SPhilipp Reisner } 189b411b363SPhilipp Reisner 190b411b363SPhilipp Reisner static void reclaim_net_ee(struct drbd_conf *mdev, struct list_head *to_be_freed) 191b411b363SPhilipp Reisner { 192db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 193b411b363SPhilipp Reisner struct list_head *le, *tle; 194b411b363SPhilipp Reisner 195b411b363SPhilipp Reisner /* The EEs are always appended to the end of the list. Since 196b411b363SPhilipp Reisner they are sent in order over the wire, they have to finish 197b411b363SPhilipp Reisner in order. As soon as we see the first not finished we can 198b411b363SPhilipp Reisner stop to examine the list... */ 199b411b363SPhilipp Reisner 200b411b363SPhilipp Reisner list_for_each_safe(le, tle, &mdev->net_ee) { 201db830c46SAndreas Gruenbacher peer_req = list_entry(le, struct drbd_peer_request, w.list); 202db830c46SAndreas Gruenbacher if (drbd_ee_has_active_page(peer_req)) 203b411b363SPhilipp Reisner break; 204b411b363SPhilipp Reisner list_move(le, to_be_freed); 205b411b363SPhilipp Reisner } 206b411b363SPhilipp Reisner } 207b411b363SPhilipp Reisner 208b411b363SPhilipp Reisner static void drbd_kick_lo_and_reclaim_net(struct drbd_conf *mdev) 209b411b363SPhilipp Reisner { 210b411b363SPhilipp Reisner LIST_HEAD(reclaimed); 211db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req, *t; 212b411b363SPhilipp Reisner 21387eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 214b411b363SPhilipp Reisner reclaim_net_ee(mdev, &reclaimed); 21587eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 216b411b363SPhilipp Reisner 217db830c46SAndreas Gruenbacher list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) 218db830c46SAndreas Gruenbacher drbd_free_net_ee(mdev, peer_req); 219b411b363SPhilipp Reisner } 220b411b363SPhilipp Reisner 221b411b363SPhilipp Reisner /** 22245bb912bSLars Ellenberg * drbd_pp_alloc() - Returns @number pages, retries forever (or until signalled) 223b411b363SPhilipp Reisner * @mdev: DRBD device. 22445bb912bSLars Ellenberg * @number: number of pages requested 22545bb912bSLars Ellenberg * @retry: whether to retry, if not enough pages are available right now 226b411b363SPhilipp Reisner * 22745bb912bSLars Ellenberg * Tries to allocate number pages, first from our own page pool, then from 22845bb912bSLars Ellenberg * the kernel, unless this allocation would exceed the max_buffers setting. 22945bb912bSLars Ellenberg * Possibly retry until DRBD frees sufficient pages somewhere else. 23045bb912bSLars Ellenberg * 23145bb912bSLars Ellenberg * Returns a page chain linked via page->private. 232b411b363SPhilipp Reisner */ 23345bb912bSLars Ellenberg static struct page *drbd_pp_alloc(struct drbd_conf *mdev, unsigned number, bool retry) 234b411b363SPhilipp Reisner { 235b411b363SPhilipp Reisner struct page *page = NULL; 236b411b363SPhilipp Reisner DEFINE_WAIT(wait); 237b411b363SPhilipp Reisner 23845bb912bSLars Ellenberg /* Yes, we may run up to @number over max_buffers. If we 23945bb912bSLars Ellenberg * follow it strictly, the admin will get it wrong anyways. */ 24089e58e75SPhilipp Reisner if (atomic_read(&mdev->pp_in_use) < mdev->tconn->net_conf->max_buffers) 24145bb912bSLars Ellenberg page = drbd_pp_first_pages_or_try_alloc(mdev, number); 242b411b363SPhilipp Reisner 24345bb912bSLars Ellenberg while (page == NULL) { 244b411b363SPhilipp Reisner prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE); 245b411b363SPhilipp Reisner 246b411b363SPhilipp Reisner drbd_kick_lo_and_reclaim_net(mdev); 247b411b363SPhilipp Reisner 24889e58e75SPhilipp Reisner if (atomic_read(&mdev->pp_in_use) < mdev->tconn->net_conf->max_buffers) { 24945bb912bSLars Ellenberg page = drbd_pp_first_pages_or_try_alloc(mdev, number); 250b411b363SPhilipp Reisner if (page) 251b411b363SPhilipp Reisner break; 252b411b363SPhilipp Reisner } 253b411b363SPhilipp Reisner 254b411b363SPhilipp Reisner if (!retry) 255b411b363SPhilipp Reisner break; 256b411b363SPhilipp Reisner 257b411b363SPhilipp Reisner if (signal_pending(current)) { 258b411b363SPhilipp Reisner dev_warn(DEV, "drbd_pp_alloc interrupted!\n"); 259b411b363SPhilipp Reisner break; 260b411b363SPhilipp Reisner } 261b411b363SPhilipp Reisner 262b411b363SPhilipp Reisner schedule(); 263b411b363SPhilipp Reisner } 264b411b363SPhilipp Reisner finish_wait(&drbd_pp_wait, &wait); 265b411b363SPhilipp Reisner 26645bb912bSLars Ellenberg if (page) 26745bb912bSLars Ellenberg atomic_add(number, &mdev->pp_in_use); 268b411b363SPhilipp Reisner return page; 269b411b363SPhilipp Reisner } 270b411b363SPhilipp Reisner 271b411b363SPhilipp Reisner /* Must not be used from irq, as that may deadlock: see drbd_pp_alloc. 27287eeee41SPhilipp Reisner * Is also used from inside an other spin_lock_irq(&mdev->tconn->req_lock); 27345bb912bSLars Ellenberg * Either links the page chain back to the global pool, 27445bb912bSLars Ellenberg * or returns all pages to the system. */ 275435f0740SLars Ellenberg static void drbd_pp_free(struct drbd_conf *mdev, struct page *page, int is_net) 276b411b363SPhilipp Reisner { 277435f0740SLars Ellenberg atomic_t *a = is_net ? &mdev->pp_in_use_by_net : &mdev->pp_in_use; 278b411b363SPhilipp Reisner int i; 279435f0740SLars Ellenberg 2801816a2b4SLars Ellenberg if (drbd_pp_vacant > (DRBD_MAX_BIO_SIZE/PAGE_SIZE)*minor_count) 28145bb912bSLars Ellenberg i = page_chain_free(page); 28245bb912bSLars Ellenberg else { 28345bb912bSLars Ellenberg struct page *tmp; 28445bb912bSLars Ellenberg tmp = page_chain_tail(page, &i); 285b411b363SPhilipp Reisner spin_lock(&drbd_pp_lock); 28645bb912bSLars Ellenberg page_chain_add(&drbd_pp_pool, page, tmp); 28745bb912bSLars Ellenberg drbd_pp_vacant += i; 288b411b363SPhilipp Reisner spin_unlock(&drbd_pp_lock); 289b411b363SPhilipp Reisner } 290435f0740SLars Ellenberg i = atomic_sub_return(i, a); 29145bb912bSLars Ellenberg if (i < 0) 292435f0740SLars Ellenberg dev_warn(DEV, "ASSERTION FAILED: %s: %d < 0\n", 293435f0740SLars Ellenberg is_net ? "pp_in_use_by_net" : "pp_in_use", i); 294b411b363SPhilipp Reisner wake_up(&drbd_pp_wait); 295b411b363SPhilipp Reisner } 296b411b363SPhilipp Reisner 297b411b363SPhilipp Reisner /* 298b411b363SPhilipp Reisner You need to hold the req_lock: 299b411b363SPhilipp Reisner _drbd_wait_ee_list_empty() 300b411b363SPhilipp Reisner 301b411b363SPhilipp Reisner You must not have the req_lock: 302b411b363SPhilipp Reisner drbd_free_ee() 303b411b363SPhilipp Reisner drbd_alloc_ee() 304b411b363SPhilipp Reisner drbd_init_ee() 305b411b363SPhilipp Reisner drbd_release_ee() 306b411b363SPhilipp Reisner drbd_ee_fix_bhs() 307b411b363SPhilipp Reisner drbd_process_done_ee() 308b411b363SPhilipp Reisner drbd_clear_done_ee() 309b411b363SPhilipp Reisner drbd_wait_ee_list_empty() 310b411b363SPhilipp Reisner */ 311b411b363SPhilipp Reisner 312f6ffca9fSAndreas Gruenbacher struct drbd_peer_request * 313f6ffca9fSAndreas Gruenbacher drbd_alloc_ee(struct drbd_conf *mdev, u64 id, sector_t sector, 314f6ffca9fSAndreas Gruenbacher unsigned int data_size, gfp_t gfp_mask) __must_hold(local) 315b411b363SPhilipp Reisner { 316db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 317b411b363SPhilipp Reisner struct page *page; 31845bb912bSLars Ellenberg unsigned nr_pages = (data_size + PAGE_SIZE -1) >> PAGE_SHIFT; 319b411b363SPhilipp Reisner 3200cf9d27eSAndreas Gruenbacher if (drbd_insert_fault(mdev, DRBD_FAULT_AL_EE)) 321b411b363SPhilipp Reisner return NULL; 322b411b363SPhilipp Reisner 323db830c46SAndreas Gruenbacher peer_req = mempool_alloc(drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM); 324db830c46SAndreas Gruenbacher if (!peer_req) { 325b411b363SPhilipp Reisner if (!(gfp_mask & __GFP_NOWARN)) 326b411b363SPhilipp Reisner dev_err(DEV, "alloc_ee: Allocation of an EE failed\n"); 327b411b363SPhilipp Reisner return NULL; 328b411b363SPhilipp Reisner } 329b411b363SPhilipp Reisner 33045bb912bSLars Ellenberg page = drbd_pp_alloc(mdev, nr_pages, (gfp_mask & __GFP_WAIT)); 33145bb912bSLars Ellenberg if (!page) 33245bb912bSLars Ellenberg goto fail; 333b411b363SPhilipp Reisner 334db830c46SAndreas Gruenbacher drbd_clear_interval(&peer_req->i); 335db830c46SAndreas Gruenbacher peer_req->i.size = data_size; 336db830c46SAndreas Gruenbacher peer_req->i.sector = sector; 337db830c46SAndreas Gruenbacher peer_req->i.local = false; 338db830c46SAndreas Gruenbacher peer_req->i.waiting = false; 33953840641SAndreas Gruenbacher 340db830c46SAndreas Gruenbacher peer_req->epoch = NULL; 341db830c46SAndreas Gruenbacher peer_req->mdev = mdev; 342db830c46SAndreas Gruenbacher peer_req->pages = page; 343db830c46SAndreas Gruenbacher atomic_set(&peer_req->pending_bios, 0); 344db830c46SAndreas Gruenbacher peer_req->flags = 0; 3459a8e7753SAndreas Gruenbacher /* 3469a8e7753SAndreas Gruenbacher * The block_id is opaque to the receiver. It is not endianness 3479a8e7753SAndreas Gruenbacher * converted, and sent back to the sender unchanged. 3489a8e7753SAndreas Gruenbacher */ 349db830c46SAndreas Gruenbacher peer_req->block_id = id; 350b411b363SPhilipp Reisner 351db830c46SAndreas Gruenbacher return peer_req; 352b411b363SPhilipp Reisner 35345bb912bSLars Ellenberg fail: 354db830c46SAndreas Gruenbacher mempool_free(peer_req, drbd_ee_mempool); 355b411b363SPhilipp Reisner return NULL; 356b411b363SPhilipp Reisner } 357b411b363SPhilipp Reisner 358db830c46SAndreas Gruenbacher void drbd_free_some_ee(struct drbd_conf *mdev, struct drbd_peer_request *peer_req, 359f6ffca9fSAndreas Gruenbacher int is_net) 360b411b363SPhilipp Reisner { 361db830c46SAndreas Gruenbacher if (peer_req->flags & EE_HAS_DIGEST) 362db830c46SAndreas Gruenbacher kfree(peer_req->digest); 363db830c46SAndreas Gruenbacher drbd_pp_free(mdev, peer_req->pages, is_net); 364db830c46SAndreas Gruenbacher D_ASSERT(atomic_read(&peer_req->pending_bios) == 0); 365db830c46SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&peer_req->i)); 366db830c46SAndreas Gruenbacher mempool_free(peer_req, drbd_ee_mempool); 367b411b363SPhilipp Reisner } 368b411b363SPhilipp Reisner 369b411b363SPhilipp Reisner int drbd_release_ee(struct drbd_conf *mdev, struct list_head *list) 370b411b363SPhilipp Reisner { 371b411b363SPhilipp Reisner LIST_HEAD(work_list); 372db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req, *t; 373b411b363SPhilipp Reisner int count = 0; 374435f0740SLars Ellenberg int is_net = list == &mdev->net_ee; 375b411b363SPhilipp Reisner 37687eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 377b411b363SPhilipp Reisner list_splice_init(list, &work_list); 37887eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 379b411b363SPhilipp Reisner 380db830c46SAndreas Gruenbacher list_for_each_entry_safe(peer_req, t, &work_list, w.list) { 381db830c46SAndreas Gruenbacher drbd_free_some_ee(mdev, peer_req, is_net); 382b411b363SPhilipp Reisner count++; 383b411b363SPhilipp Reisner } 384b411b363SPhilipp Reisner return count; 385b411b363SPhilipp Reisner } 386b411b363SPhilipp Reisner 387b411b363SPhilipp Reisner 388b411b363SPhilipp Reisner /* 389b411b363SPhilipp Reisner * This function is called from _asender only_ 3908554df1cSAndreas Gruenbacher * but see also comments in _req_mod(,BARRIER_ACKED) 391b411b363SPhilipp Reisner * and receive_Barrier. 392b411b363SPhilipp Reisner * 393b411b363SPhilipp Reisner * Move entries from net_ee to done_ee, if ready. 394b411b363SPhilipp Reisner * Grab done_ee, call all callbacks, free the entries. 395b411b363SPhilipp Reisner * The callbacks typically send out ACKs. 396b411b363SPhilipp Reisner */ 397b411b363SPhilipp Reisner static int drbd_process_done_ee(struct drbd_conf *mdev) 398b411b363SPhilipp Reisner { 399b411b363SPhilipp Reisner LIST_HEAD(work_list); 400b411b363SPhilipp Reisner LIST_HEAD(reclaimed); 401db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req, *t; 402b411b363SPhilipp Reisner int ok = (mdev->state.conn >= C_WF_REPORT_PARAMS); 403b411b363SPhilipp Reisner 40487eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 405b411b363SPhilipp Reisner reclaim_net_ee(mdev, &reclaimed); 406b411b363SPhilipp Reisner list_splice_init(&mdev->done_ee, &work_list); 40787eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 408b411b363SPhilipp Reisner 409db830c46SAndreas Gruenbacher list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) 410db830c46SAndreas Gruenbacher drbd_free_net_ee(mdev, peer_req); 411b411b363SPhilipp Reisner 412b411b363SPhilipp Reisner /* possible callbacks here: 413b411b363SPhilipp Reisner * e_end_block, and e_end_resync_block, e_send_discard_ack. 414b411b363SPhilipp Reisner * all ignore the last argument. 415b411b363SPhilipp Reisner */ 416db830c46SAndreas Gruenbacher list_for_each_entry_safe(peer_req, t, &work_list, w.list) { 417b411b363SPhilipp Reisner /* list_del not necessary, next/prev members not touched */ 418db830c46SAndreas Gruenbacher ok = peer_req->w.cb(mdev, &peer_req->w, !ok) && ok; 419db830c46SAndreas Gruenbacher drbd_free_ee(mdev, peer_req); 420b411b363SPhilipp Reisner } 421b411b363SPhilipp Reisner wake_up(&mdev->ee_wait); 422b411b363SPhilipp Reisner 423b411b363SPhilipp Reisner return ok; 424b411b363SPhilipp Reisner } 425b411b363SPhilipp Reisner 426b411b363SPhilipp Reisner void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head) 427b411b363SPhilipp Reisner { 428b411b363SPhilipp Reisner DEFINE_WAIT(wait); 429b411b363SPhilipp Reisner 430b411b363SPhilipp Reisner /* avoids spin_lock/unlock 431b411b363SPhilipp Reisner * and calling prepare_to_wait in the fast path */ 432b411b363SPhilipp Reisner while (!list_empty(head)) { 433b411b363SPhilipp Reisner prepare_to_wait(&mdev->ee_wait, &wait, TASK_UNINTERRUPTIBLE); 43487eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 4357eaceaccSJens Axboe io_schedule(); 436b411b363SPhilipp Reisner finish_wait(&mdev->ee_wait, &wait); 43787eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 438b411b363SPhilipp Reisner } 439b411b363SPhilipp Reisner } 440b411b363SPhilipp Reisner 441b411b363SPhilipp Reisner void drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head) 442b411b363SPhilipp Reisner { 44387eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 444b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, head); 44587eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 446b411b363SPhilipp Reisner } 447b411b363SPhilipp Reisner 448b411b363SPhilipp Reisner /* see also kernel_accept; which is only present since 2.6.18. 449b411b363SPhilipp Reisner * also we want to log which part of it failed, exactly */ 4507653620dSPhilipp Reisner static int drbd_accept(const char **what, struct socket *sock, struct socket **newsock) 451b411b363SPhilipp Reisner { 452b411b363SPhilipp Reisner struct sock *sk = sock->sk; 453b411b363SPhilipp Reisner int err = 0; 454b411b363SPhilipp Reisner 455b411b363SPhilipp Reisner *what = "listen"; 456b411b363SPhilipp Reisner err = sock->ops->listen(sock, 5); 457b411b363SPhilipp Reisner if (err < 0) 458b411b363SPhilipp Reisner goto out; 459b411b363SPhilipp Reisner 460b411b363SPhilipp Reisner *what = "sock_create_lite"; 461b411b363SPhilipp Reisner err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, 462b411b363SPhilipp Reisner newsock); 463b411b363SPhilipp Reisner if (err < 0) 464b411b363SPhilipp Reisner goto out; 465b411b363SPhilipp Reisner 466b411b363SPhilipp Reisner *what = "accept"; 467b411b363SPhilipp Reisner err = sock->ops->accept(sock, *newsock, 0); 468b411b363SPhilipp Reisner if (err < 0) { 469b411b363SPhilipp Reisner sock_release(*newsock); 470b411b363SPhilipp Reisner *newsock = NULL; 471b411b363SPhilipp Reisner goto out; 472b411b363SPhilipp Reisner } 473b411b363SPhilipp Reisner (*newsock)->ops = sock->ops; 474b411b363SPhilipp Reisner 475b411b363SPhilipp Reisner out: 476b411b363SPhilipp Reisner return err; 477b411b363SPhilipp Reisner } 478b411b363SPhilipp Reisner 479dbd9eea0SPhilipp Reisner static int drbd_recv_short(struct socket *sock, void *buf, size_t size, int flags) 480b411b363SPhilipp Reisner { 481b411b363SPhilipp Reisner mm_segment_t oldfs; 482b411b363SPhilipp Reisner struct kvec iov = { 483b411b363SPhilipp Reisner .iov_base = buf, 484b411b363SPhilipp Reisner .iov_len = size, 485b411b363SPhilipp Reisner }; 486b411b363SPhilipp Reisner struct msghdr msg = { 487b411b363SPhilipp Reisner .msg_iovlen = 1, 488b411b363SPhilipp Reisner .msg_iov = (struct iovec *)&iov, 489b411b363SPhilipp Reisner .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) 490b411b363SPhilipp Reisner }; 491b411b363SPhilipp Reisner int rv; 492b411b363SPhilipp Reisner 493b411b363SPhilipp Reisner oldfs = get_fs(); 494b411b363SPhilipp Reisner set_fs(KERNEL_DS); 495b411b363SPhilipp Reisner rv = sock_recvmsg(sock, &msg, size, msg.msg_flags); 496b411b363SPhilipp Reisner set_fs(oldfs); 497b411b363SPhilipp Reisner 498b411b363SPhilipp Reisner return rv; 499b411b363SPhilipp Reisner } 500b411b363SPhilipp Reisner 501b411b363SPhilipp Reisner static int drbd_recv(struct drbd_conf *mdev, void *buf, size_t size) 502b411b363SPhilipp Reisner { 503b411b363SPhilipp Reisner mm_segment_t oldfs; 504b411b363SPhilipp Reisner struct kvec iov = { 505b411b363SPhilipp Reisner .iov_base = buf, 506b411b363SPhilipp Reisner .iov_len = size, 507b411b363SPhilipp Reisner }; 508b411b363SPhilipp Reisner struct msghdr msg = { 509b411b363SPhilipp Reisner .msg_iovlen = 1, 510b411b363SPhilipp Reisner .msg_iov = (struct iovec *)&iov, 511b411b363SPhilipp Reisner .msg_flags = MSG_WAITALL | MSG_NOSIGNAL 512b411b363SPhilipp Reisner }; 513b411b363SPhilipp Reisner int rv; 514b411b363SPhilipp Reisner 515b411b363SPhilipp Reisner oldfs = get_fs(); 516b411b363SPhilipp Reisner set_fs(KERNEL_DS); 517b411b363SPhilipp Reisner 518b411b363SPhilipp Reisner for (;;) { 519e42325a5SPhilipp Reisner rv = sock_recvmsg(mdev->tconn->data.socket, &msg, size, msg.msg_flags); 520b411b363SPhilipp Reisner if (rv == size) 521b411b363SPhilipp Reisner break; 522b411b363SPhilipp Reisner 523b411b363SPhilipp Reisner /* Note: 524b411b363SPhilipp Reisner * ECONNRESET other side closed the connection 525b411b363SPhilipp Reisner * ERESTARTSYS (on sock) we got a signal 526b411b363SPhilipp Reisner */ 527b411b363SPhilipp Reisner 528b411b363SPhilipp Reisner if (rv < 0) { 529b411b363SPhilipp Reisner if (rv == -ECONNRESET) 530b411b363SPhilipp Reisner dev_info(DEV, "sock was reset by peer\n"); 531b411b363SPhilipp Reisner else if (rv != -ERESTARTSYS) 532b411b363SPhilipp Reisner dev_err(DEV, "sock_recvmsg returned %d\n", rv); 533b411b363SPhilipp Reisner break; 534b411b363SPhilipp Reisner } else if (rv == 0) { 535b411b363SPhilipp Reisner dev_info(DEV, "sock was shut down by peer\n"); 536b411b363SPhilipp Reisner break; 537b411b363SPhilipp Reisner } else { 538b411b363SPhilipp Reisner /* signal came in, or peer/link went down, 539b411b363SPhilipp Reisner * after we read a partial message 540b411b363SPhilipp Reisner */ 541b411b363SPhilipp Reisner /* D_ASSERT(signal_pending(current)); */ 542b411b363SPhilipp Reisner break; 543b411b363SPhilipp Reisner } 544b411b363SPhilipp Reisner }; 545b411b363SPhilipp Reisner 546b411b363SPhilipp Reisner set_fs(oldfs); 547b411b363SPhilipp Reisner 548b411b363SPhilipp Reisner if (rv != size) 549b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_BROKEN_PIPE)); 550b411b363SPhilipp Reisner 551b411b363SPhilipp Reisner return rv; 552b411b363SPhilipp Reisner } 553b411b363SPhilipp Reisner 5545dbf1673SLars Ellenberg /* quoting tcp(7): 5555dbf1673SLars Ellenberg * On individual connections, the socket buffer size must be set prior to the 5565dbf1673SLars Ellenberg * listen(2) or connect(2) calls in order to have it take effect. 5575dbf1673SLars Ellenberg * This is our wrapper to do so. 5585dbf1673SLars Ellenberg */ 5595dbf1673SLars Ellenberg static void drbd_setbufsize(struct socket *sock, unsigned int snd, 5605dbf1673SLars Ellenberg unsigned int rcv) 5615dbf1673SLars Ellenberg { 5625dbf1673SLars Ellenberg /* open coded SO_SNDBUF, SO_RCVBUF */ 5635dbf1673SLars Ellenberg if (snd) { 5645dbf1673SLars Ellenberg sock->sk->sk_sndbuf = snd; 5655dbf1673SLars Ellenberg sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 5665dbf1673SLars Ellenberg } 5675dbf1673SLars Ellenberg if (rcv) { 5685dbf1673SLars Ellenberg sock->sk->sk_rcvbuf = rcv; 5695dbf1673SLars Ellenberg sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 5705dbf1673SLars Ellenberg } 5715dbf1673SLars Ellenberg } 5725dbf1673SLars Ellenberg 573eac3e990SPhilipp Reisner static struct socket *drbd_try_connect(struct drbd_tconn *tconn) 574b411b363SPhilipp Reisner { 575b411b363SPhilipp Reisner const char *what; 576b411b363SPhilipp Reisner struct socket *sock; 577b411b363SPhilipp Reisner struct sockaddr_in6 src_in6; 578b411b363SPhilipp Reisner int err; 579b411b363SPhilipp Reisner int disconnect_on_error = 1; 580b411b363SPhilipp Reisner 581eac3e990SPhilipp Reisner if (!get_net_conf(tconn)) 582b411b363SPhilipp Reisner return NULL; 583b411b363SPhilipp Reisner 584b411b363SPhilipp Reisner what = "sock_create_kern"; 585eac3e990SPhilipp Reisner err = sock_create_kern(((struct sockaddr *)tconn->net_conf->my_addr)->sa_family, 586b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &sock); 587b411b363SPhilipp Reisner if (err < 0) { 588b411b363SPhilipp Reisner sock = NULL; 589b411b363SPhilipp Reisner goto out; 590b411b363SPhilipp Reisner } 591b411b363SPhilipp Reisner 592b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = 593eac3e990SPhilipp Reisner sock->sk->sk_sndtimeo = tconn->net_conf->try_connect_int*HZ; 594eac3e990SPhilipp Reisner drbd_setbufsize(sock, tconn->net_conf->sndbuf_size, 595eac3e990SPhilipp Reisner tconn->net_conf->rcvbuf_size); 596b411b363SPhilipp Reisner 597b411b363SPhilipp Reisner /* explicitly bind to the configured IP as source IP 598b411b363SPhilipp Reisner * for the outgoing connections. 599b411b363SPhilipp Reisner * This is needed for multihomed hosts and to be 600b411b363SPhilipp Reisner * able to use lo: interfaces for drbd. 601b411b363SPhilipp Reisner * Make sure to use 0 as port number, so linux selects 602b411b363SPhilipp Reisner * a free one dynamically. 603b411b363SPhilipp Reisner */ 604eac3e990SPhilipp Reisner memcpy(&src_in6, tconn->net_conf->my_addr, 605eac3e990SPhilipp Reisner min_t(int, tconn->net_conf->my_addr_len, sizeof(src_in6))); 606eac3e990SPhilipp Reisner if (((struct sockaddr *)tconn->net_conf->my_addr)->sa_family == AF_INET6) 607b411b363SPhilipp Reisner src_in6.sin6_port = 0; 608b411b363SPhilipp Reisner else 609b411b363SPhilipp Reisner ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ 610b411b363SPhilipp Reisner 611b411b363SPhilipp Reisner what = "bind before connect"; 612b411b363SPhilipp Reisner err = sock->ops->bind(sock, 613b411b363SPhilipp Reisner (struct sockaddr *) &src_in6, 614eac3e990SPhilipp Reisner tconn->net_conf->my_addr_len); 615b411b363SPhilipp Reisner if (err < 0) 616b411b363SPhilipp Reisner goto out; 617b411b363SPhilipp Reisner 618b411b363SPhilipp Reisner /* connect may fail, peer not yet available. 619b411b363SPhilipp Reisner * stay C_WF_CONNECTION, don't go Disconnecting! */ 620b411b363SPhilipp Reisner disconnect_on_error = 0; 621b411b363SPhilipp Reisner what = "connect"; 622b411b363SPhilipp Reisner err = sock->ops->connect(sock, 623eac3e990SPhilipp Reisner (struct sockaddr *)tconn->net_conf->peer_addr, 624eac3e990SPhilipp Reisner tconn->net_conf->peer_addr_len, 0); 625b411b363SPhilipp Reisner 626b411b363SPhilipp Reisner out: 627b411b363SPhilipp Reisner if (err < 0) { 628b411b363SPhilipp Reisner if (sock) { 629b411b363SPhilipp Reisner sock_release(sock); 630b411b363SPhilipp Reisner sock = NULL; 631b411b363SPhilipp Reisner } 632b411b363SPhilipp Reisner switch (-err) { 633b411b363SPhilipp Reisner /* timeout, busy, signal pending */ 634b411b363SPhilipp Reisner case ETIMEDOUT: case EAGAIN: case EINPROGRESS: 635b411b363SPhilipp Reisner case EINTR: case ERESTARTSYS: 636b411b363SPhilipp Reisner /* peer not (yet) available, network problem */ 637b411b363SPhilipp Reisner case ECONNREFUSED: case ENETUNREACH: 638b411b363SPhilipp Reisner case EHOSTDOWN: case EHOSTUNREACH: 639b411b363SPhilipp Reisner disconnect_on_error = 0; 640b411b363SPhilipp Reisner break; 641b411b363SPhilipp Reisner default: 642eac3e990SPhilipp Reisner conn_err(tconn, "%s failed, err = %d\n", what, err); 643b411b363SPhilipp Reisner } 644b411b363SPhilipp Reisner if (disconnect_on_error) 645eac3e990SPhilipp Reisner drbd_force_state(tconn->volume0, NS(conn, C_DISCONNECTING)); 646b411b363SPhilipp Reisner } 647eac3e990SPhilipp Reisner put_net_conf(tconn); 648b411b363SPhilipp Reisner return sock; 649b411b363SPhilipp Reisner } 650b411b363SPhilipp Reisner 6517653620dSPhilipp Reisner static struct socket *drbd_wait_for_connect(struct drbd_tconn *tconn) 652b411b363SPhilipp Reisner { 653b411b363SPhilipp Reisner int timeo, err; 654b411b363SPhilipp Reisner struct socket *s_estab = NULL, *s_listen; 655b411b363SPhilipp Reisner const char *what; 656b411b363SPhilipp Reisner 6577653620dSPhilipp Reisner if (!get_net_conf(tconn)) 658b411b363SPhilipp Reisner return NULL; 659b411b363SPhilipp Reisner 660b411b363SPhilipp Reisner what = "sock_create_kern"; 6617653620dSPhilipp Reisner err = sock_create_kern(((struct sockaddr *)tconn->net_conf->my_addr)->sa_family, 662b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &s_listen); 663b411b363SPhilipp Reisner if (err) { 664b411b363SPhilipp Reisner s_listen = NULL; 665b411b363SPhilipp Reisner goto out; 666b411b363SPhilipp Reisner } 667b411b363SPhilipp Reisner 6687653620dSPhilipp Reisner timeo = tconn->net_conf->try_connect_int * HZ; 669b411b363SPhilipp Reisner timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */ 670b411b363SPhilipp Reisner 671b411b363SPhilipp Reisner s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */ 672b411b363SPhilipp Reisner s_listen->sk->sk_rcvtimeo = timeo; 673b411b363SPhilipp Reisner s_listen->sk->sk_sndtimeo = timeo; 6747653620dSPhilipp Reisner drbd_setbufsize(s_listen, tconn->net_conf->sndbuf_size, 6757653620dSPhilipp Reisner tconn->net_conf->rcvbuf_size); 676b411b363SPhilipp Reisner 677b411b363SPhilipp Reisner what = "bind before listen"; 678b411b363SPhilipp Reisner err = s_listen->ops->bind(s_listen, 6797653620dSPhilipp Reisner (struct sockaddr *) tconn->net_conf->my_addr, 6807653620dSPhilipp Reisner tconn->net_conf->my_addr_len); 681b411b363SPhilipp Reisner if (err < 0) 682b411b363SPhilipp Reisner goto out; 683b411b363SPhilipp Reisner 6847653620dSPhilipp Reisner err = drbd_accept(&what, s_listen, &s_estab); 685b411b363SPhilipp Reisner 686b411b363SPhilipp Reisner out: 687b411b363SPhilipp Reisner if (s_listen) 688b411b363SPhilipp Reisner sock_release(s_listen); 689b411b363SPhilipp Reisner if (err < 0) { 690b411b363SPhilipp Reisner if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { 6917653620dSPhilipp Reisner conn_err(tconn, "%s failed, err = %d\n", what, err); 6927653620dSPhilipp Reisner drbd_force_state(tconn->volume0, NS(conn, C_DISCONNECTING)); 693b411b363SPhilipp Reisner } 694b411b363SPhilipp Reisner } 6957653620dSPhilipp Reisner put_net_conf(tconn); 696b411b363SPhilipp Reisner 697b411b363SPhilipp Reisner return s_estab; 698b411b363SPhilipp Reisner } 699b411b363SPhilipp Reisner 700d38e787eSPhilipp Reisner static int drbd_send_fp(struct drbd_tconn *tconn, struct socket *sock, enum drbd_packet cmd) 701b411b363SPhilipp Reisner { 702d38e787eSPhilipp Reisner struct p_header *h = &tconn->data.sbuf.header; 703b411b363SPhilipp Reisner 704d38e787eSPhilipp Reisner return _conn_send_cmd(tconn, 0, sock, cmd, h, sizeof(*h), 0); 705b411b363SPhilipp Reisner } 706b411b363SPhilipp Reisner 707d38e787eSPhilipp Reisner static enum drbd_packet drbd_recv_fp(struct drbd_conf *mdev, struct socket *sock) 708b411b363SPhilipp Reisner { 709e42325a5SPhilipp Reisner struct p_header80 *h = &mdev->tconn->data.rbuf.header.h80; 710b411b363SPhilipp Reisner int rr; 711b411b363SPhilipp Reisner 712dbd9eea0SPhilipp Reisner rr = drbd_recv_short(sock, h, sizeof(*h), 0); 713b411b363SPhilipp Reisner 714ca9bc12bSAndreas Gruenbacher if (rr == sizeof(*h) && h->magic == cpu_to_be32(DRBD_MAGIC)) 715b411b363SPhilipp Reisner return be16_to_cpu(h->command); 716b411b363SPhilipp Reisner 717b411b363SPhilipp Reisner return 0xffff; 718b411b363SPhilipp Reisner } 719b411b363SPhilipp Reisner 720b411b363SPhilipp Reisner /** 721b411b363SPhilipp Reisner * drbd_socket_okay() - Free the socket if its connection is not okay 722b411b363SPhilipp Reisner * @sock: pointer to the pointer to the socket. 723b411b363SPhilipp Reisner */ 724dbd9eea0SPhilipp Reisner static int drbd_socket_okay(struct socket **sock) 725b411b363SPhilipp Reisner { 726b411b363SPhilipp Reisner int rr; 727b411b363SPhilipp Reisner char tb[4]; 728b411b363SPhilipp Reisner 729b411b363SPhilipp Reisner if (!*sock) 73081e84650SAndreas Gruenbacher return false; 731b411b363SPhilipp Reisner 732dbd9eea0SPhilipp Reisner rr = drbd_recv_short(*sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); 733b411b363SPhilipp Reisner 734b411b363SPhilipp Reisner if (rr > 0 || rr == -EAGAIN) { 73581e84650SAndreas Gruenbacher return true; 736b411b363SPhilipp Reisner } else { 737b411b363SPhilipp Reisner sock_release(*sock); 738b411b363SPhilipp Reisner *sock = NULL; 73981e84650SAndreas Gruenbacher return false; 740b411b363SPhilipp Reisner } 741b411b363SPhilipp Reisner } 742b411b363SPhilipp Reisner 743b411b363SPhilipp Reisner /* 744b411b363SPhilipp Reisner * return values: 745b411b363SPhilipp Reisner * 1 yes, we have a valid connection 746b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 747b411b363SPhilipp Reisner * -1 peer talks different language, 748b411b363SPhilipp Reisner * no point in trying again, please go standalone. 749b411b363SPhilipp Reisner * -2 We do not have a network config... 750b411b363SPhilipp Reisner */ 751b411b363SPhilipp Reisner static int drbd_connect(struct drbd_conf *mdev) 752b411b363SPhilipp Reisner { 753b411b363SPhilipp Reisner struct socket *s, *sock, *msock; 754b411b363SPhilipp Reisner int try, h, ok; 755b411b363SPhilipp Reisner 756e42325a5SPhilipp Reisner D_ASSERT(!mdev->tconn->data.socket); 757b411b363SPhilipp Reisner 758b411b363SPhilipp Reisner if (drbd_request_state(mdev, NS(conn, C_WF_CONNECTION)) < SS_SUCCESS) 759b411b363SPhilipp Reisner return -2; 760b411b363SPhilipp Reisner 76125703f83SPhilipp Reisner clear_bit(DISCARD_CONCURRENT, &mdev->tconn->flags); 762fd340c12SPhilipp Reisner mdev->tconn->agreed_pro_version = 99; 763fd340c12SPhilipp Reisner /* agreed_pro_version must be smaller than 100 so we send the old 764fd340c12SPhilipp Reisner header (h80) in the first packet and in the handshake packet. */ 765b411b363SPhilipp Reisner 766b411b363SPhilipp Reisner sock = NULL; 767b411b363SPhilipp Reisner msock = NULL; 768b411b363SPhilipp Reisner 769b411b363SPhilipp Reisner do { 770b411b363SPhilipp Reisner for (try = 0;;) { 771b411b363SPhilipp Reisner /* 3 tries, this should take less than a second! */ 772eac3e990SPhilipp Reisner s = drbd_try_connect(mdev->tconn); 773b411b363SPhilipp Reisner if (s || ++try >= 3) 774b411b363SPhilipp Reisner break; 775b411b363SPhilipp Reisner /* give the other side time to call bind() & listen() */ 77620ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ / 10); 777b411b363SPhilipp Reisner } 778b411b363SPhilipp Reisner 779b411b363SPhilipp Reisner if (s) { 780b411b363SPhilipp Reisner if (!sock) { 781d38e787eSPhilipp Reisner drbd_send_fp(mdev->tconn, s, P_HAND_SHAKE_S); 782b411b363SPhilipp Reisner sock = s; 783b411b363SPhilipp Reisner s = NULL; 784b411b363SPhilipp Reisner } else if (!msock) { 785d38e787eSPhilipp Reisner drbd_send_fp(mdev->tconn, s, P_HAND_SHAKE_M); 786b411b363SPhilipp Reisner msock = s; 787b411b363SPhilipp Reisner s = NULL; 788b411b363SPhilipp Reisner } else { 789b411b363SPhilipp Reisner dev_err(DEV, "Logic error in drbd_connect()\n"); 790b411b363SPhilipp Reisner goto out_release_sockets; 791b411b363SPhilipp Reisner } 792b411b363SPhilipp Reisner } 793b411b363SPhilipp Reisner 794b411b363SPhilipp Reisner if (sock && msock) { 79589e58e75SPhilipp Reisner schedule_timeout_interruptible(mdev->tconn->net_conf->ping_timeo*HZ/10); 796dbd9eea0SPhilipp Reisner ok = drbd_socket_okay(&sock); 797dbd9eea0SPhilipp Reisner ok = drbd_socket_okay(&msock) && ok; 798b411b363SPhilipp Reisner if (ok) 799b411b363SPhilipp Reisner break; 800b411b363SPhilipp Reisner } 801b411b363SPhilipp Reisner 802b411b363SPhilipp Reisner retry: 8037653620dSPhilipp Reisner s = drbd_wait_for_connect(mdev->tconn); 804b411b363SPhilipp Reisner if (s) { 805b411b363SPhilipp Reisner try = drbd_recv_fp(mdev, s); 806dbd9eea0SPhilipp Reisner drbd_socket_okay(&sock); 807dbd9eea0SPhilipp Reisner drbd_socket_okay(&msock); 808b411b363SPhilipp Reisner switch (try) { 809b411b363SPhilipp Reisner case P_HAND_SHAKE_S: 810b411b363SPhilipp Reisner if (sock) { 811b411b363SPhilipp Reisner dev_warn(DEV, "initial packet S crossed\n"); 812b411b363SPhilipp Reisner sock_release(sock); 813b411b363SPhilipp Reisner } 814b411b363SPhilipp Reisner sock = s; 815b411b363SPhilipp Reisner break; 816b411b363SPhilipp Reisner case P_HAND_SHAKE_M: 817b411b363SPhilipp Reisner if (msock) { 818b411b363SPhilipp Reisner dev_warn(DEV, "initial packet M crossed\n"); 819b411b363SPhilipp Reisner sock_release(msock); 820b411b363SPhilipp Reisner } 821b411b363SPhilipp Reisner msock = s; 82225703f83SPhilipp Reisner set_bit(DISCARD_CONCURRENT, &mdev->tconn->flags); 823b411b363SPhilipp Reisner break; 824b411b363SPhilipp Reisner default: 825b411b363SPhilipp Reisner dev_warn(DEV, "Error receiving initial packet\n"); 826b411b363SPhilipp Reisner sock_release(s); 827b411b363SPhilipp Reisner if (random32() & 1) 828b411b363SPhilipp Reisner goto retry; 829b411b363SPhilipp Reisner } 830b411b363SPhilipp Reisner } 831b411b363SPhilipp Reisner 832b411b363SPhilipp Reisner if (mdev->state.conn <= C_DISCONNECTING) 833b411b363SPhilipp Reisner goto out_release_sockets; 834b411b363SPhilipp Reisner if (signal_pending(current)) { 835b411b363SPhilipp Reisner flush_signals(current); 836b411b363SPhilipp Reisner smp_rmb(); 837e6b3ea83SPhilipp Reisner if (get_t_state(&mdev->tconn->receiver) == EXITING) 838b411b363SPhilipp Reisner goto out_release_sockets; 839b411b363SPhilipp Reisner } 840b411b363SPhilipp Reisner 841b411b363SPhilipp Reisner if (sock && msock) { 842dbd9eea0SPhilipp Reisner ok = drbd_socket_okay(&sock); 843dbd9eea0SPhilipp Reisner ok = drbd_socket_okay(&msock) && ok; 844b411b363SPhilipp Reisner if (ok) 845b411b363SPhilipp Reisner break; 846b411b363SPhilipp Reisner } 847b411b363SPhilipp Reisner } while (1); 848b411b363SPhilipp Reisner 849b411b363SPhilipp Reisner msock->sk->sk_reuse = 1; /* SO_REUSEADDR */ 850b411b363SPhilipp Reisner sock->sk->sk_reuse = 1; /* SO_REUSEADDR */ 851b411b363SPhilipp Reisner 852b411b363SPhilipp Reisner sock->sk->sk_allocation = GFP_NOIO; 853b411b363SPhilipp Reisner msock->sk->sk_allocation = GFP_NOIO; 854b411b363SPhilipp Reisner 855b411b363SPhilipp Reisner sock->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; 856b411b363SPhilipp Reisner msock->sk->sk_priority = TC_PRIO_INTERACTIVE; 857b411b363SPhilipp Reisner 858b411b363SPhilipp Reisner /* NOT YET ... 85989e58e75SPhilipp Reisner * sock->sk->sk_sndtimeo = mdev->tconn->net_conf->timeout*HZ/10; 860b411b363SPhilipp Reisner * sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 861b411b363SPhilipp Reisner * first set it to the P_HAND_SHAKE timeout, 862b411b363SPhilipp Reisner * which we set to 4x the configured ping_timeout. */ 863b411b363SPhilipp Reisner sock->sk->sk_sndtimeo = 86489e58e75SPhilipp Reisner sock->sk->sk_rcvtimeo = mdev->tconn->net_conf->ping_timeo*4*HZ/10; 865b411b363SPhilipp Reisner 86689e58e75SPhilipp Reisner msock->sk->sk_sndtimeo = mdev->tconn->net_conf->timeout*HZ/10; 86789e58e75SPhilipp Reisner msock->sk->sk_rcvtimeo = mdev->tconn->net_conf->ping_int*HZ; 868b411b363SPhilipp Reisner 869b411b363SPhilipp Reisner /* we don't want delays. 87025985edcSLucas De Marchi * we use TCP_CORK where appropriate, though */ 871b411b363SPhilipp Reisner drbd_tcp_nodelay(sock); 872b411b363SPhilipp Reisner drbd_tcp_nodelay(msock); 873b411b363SPhilipp Reisner 874e42325a5SPhilipp Reisner mdev->tconn->data.socket = sock; 875e42325a5SPhilipp Reisner mdev->tconn->meta.socket = msock; 87631890f4aSPhilipp Reisner mdev->tconn->last_received = jiffies; 877b411b363SPhilipp Reisner 878e6b3ea83SPhilipp Reisner D_ASSERT(mdev->tconn->asender.task == NULL); 879b411b363SPhilipp Reisner 880b411b363SPhilipp Reisner h = drbd_do_handshake(mdev); 881b411b363SPhilipp Reisner if (h <= 0) 882b411b363SPhilipp Reisner return h; 883b411b363SPhilipp Reisner 884a0638456SPhilipp Reisner if (mdev->tconn->cram_hmac_tfm) { 885b411b363SPhilipp Reisner /* drbd_request_state(mdev, NS(conn, WFAuth)); */ 886b10d96cbSJohannes Thoma switch (drbd_do_auth(mdev)) { 887b10d96cbSJohannes Thoma case -1: 888b411b363SPhilipp Reisner dev_err(DEV, "Authentication of peer failed\n"); 889b411b363SPhilipp Reisner return -1; 890b10d96cbSJohannes Thoma case 0: 891b10d96cbSJohannes Thoma dev_err(DEV, "Authentication of peer failed, trying again.\n"); 892b10d96cbSJohannes Thoma return 0; 893b411b363SPhilipp Reisner } 894b411b363SPhilipp Reisner } 895b411b363SPhilipp Reisner 896b411b363SPhilipp Reisner if (drbd_request_state(mdev, NS(conn, C_WF_REPORT_PARAMS)) < SS_SUCCESS) 897b411b363SPhilipp Reisner return 0; 898b411b363SPhilipp Reisner 89989e58e75SPhilipp Reisner sock->sk->sk_sndtimeo = mdev->tconn->net_conf->timeout*HZ/10; 900b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 901b411b363SPhilipp Reisner 902b411b363SPhilipp Reisner atomic_set(&mdev->packet_seq, 0); 903b411b363SPhilipp Reisner mdev->peer_seq = 0; 904b411b363SPhilipp Reisner 905e6b3ea83SPhilipp Reisner drbd_thread_start(&mdev->tconn->asender); 906b411b363SPhilipp Reisner 907148efa16SPhilipp Reisner if (drbd_send_protocol(mdev) == -1) 9087e2455c1SPhilipp Reisner return -1; 909b411b363SPhilipp Reisner drbd_send_sync_param(mdev, &mdev->sync_conf); 910e89b591cSPhilipp Reisner drbd_send_sizes(mdev, 0, 0); 911b411b363SPhilipp Reisner drbd_send_uuids(mdev); 912b411b363SPhilipp Reisner drbd_send_state(mdev); 913b411b363SPhilipp Reisner clear_bit(USE_DEGR_WFC_T, &mdev->flags); 914b411b363SPhilipp Reisner clear_bit(RESIZE_PENDING, &mdev->flags); 9157fde2be9SPhilipp Reisner mod_timer(&mdev->request_timer, jiffies + HZ); /* just start it here. */ 916b411b363SPhilipp Reisner 917b411b363SPhilipp Reisner return 1; 918b411b363SPhilipp Reisner 919b411b363SPhilipp Reisner out_release_sockets: 920b411b363SPhilipp Reisner if (sock) 921b411b363SPhilipp Reisner sock_release(sock); 922b411b363SPhilipp Reisner if (msock) 923b411b363SPhilipp Reisner sock_release(msock); 924b411b363SPhilipp Reisner return -1; 925b411b363SPhilipp Reisner } 926b411b363SPhilipp Reisner 927d8763023SAndreas Gruenbacher static bool decode_header(struct drbd_conf *mdev, struct p_header *h, 928d8763023SAndreas Gruenbacher enum drbd_packet *cmd, unsigned int *packet_size) 929b411b363SPhilipp Reisner { 930fd340c12SPhilipp Reisner if (h->h80.magic == cpu_to_be32(DRBD_MAGIC)) { 93102918be2SPhilipp Reisner *cmd = be16_to_cpu(h->h80.command); 93202918be2SPhilipp Reisner *packet_size = be16_to_cpu(h->h80.length); 933ca9bc12bSAndreas Gruenbacher } else if (h->h95.magic == cpu_to_be16(DRBD_MAGIC_BIG)) { 93402918be2SPhilipp Reisner *cmd = be16_to_cpu(h->h95.command); 935fd340c12SPhilipp Reisner *packet_size = be32_to_cpu(h->h95.length) & 0x00ffffff; 93602918be2SPhilipp Reisner } else { 937004352faSLars Ellenberg dev_err(DEV, "magic?? on data m: 0x%08x c: %d l: %d\n", 938004352faSLars Ellenberg be32_to_cpu(h->h80.magic), 939004352faSLars Ellenberg be16_to_cpu(h->h80.command), 940004352faSLars Ellenberg be16_to_cpu(h->h80.length)); 94181e84650SAndreas Gruenbacher return false; 942b411b363SPhilipp Reisner } 943257d0af6SPhilipp Reisner return true; 944257d0af6SPhilipp Reisner } 945257d0af6SPhilipp Reisner 946d8763023SAndreas Gruenbacher static int drbd_recv_header(struct drbd_conf *mdev, enum drbd_packet *cmd, 947d8763023SAndreas Gruenbacher unsigned int *packet_size) 948257d0af6SPhilipp Reisner { 949257d0af6SPhilipp Reisner struct p_header *h = &mdev->tconn->data.rbuf.header; 950257d0af6SPhilipp Reisner int r; 951257d0af6SPhilipp Reisner 952257d0af6SPhilipp Reisner r = drbd_recv(mdev, h, sizeof(*h)); 953257d0af6SPhilipp Reisner if (unlikely(r != sizeof(*h))) { 954257d0af6SPhilipp Reisner if (!signal_pending(current)) 955257d0af6SPhilipp Reisner dev_warn(DEV, "short read expecting header on sock: r=%d\n", r); 956257d0af6SPhilipp Reisner return false; 957257d0af6SPhilipp Reisner } 958257d0af6SPhilipp Reisner 959257d0af6SPhilipp Reisner r = decode_header(mdev, h, cmd, packet_size); 96031890f4aSPhilipp Reisner mdev->tconn->last_received = jiffies; 961b411b363SPhilipp Reisner 962257d0af6SPhilipp Reisner return r; 963b411b363SPhilipp Reisner } 964b411b363SPhilipp Reisner 9652451fc3bSPhilipp Reisner static void drbd_flush(struct drbd_conf *mdev) 966b411b363SPhilipp Reisner { 967b411b363SPhilipp Reisner int rv; 968b411b363SPhilipp Reisner 969b411b363SPhilipp Reisner if (mdev->write_ordering >= WO_bdev_flush && get_ldev(mdev)) { 970fbd9b09aSDmitry Monakhov rv = blkdev_issue_flush(mdev->ldev->backing_bdev, GFP_KERNEL, 971dd3932edSChristoph Hellwig NULL); 972b411b363SPhilipp Reisner if (rv) { 973b411b363SPhilipp Reisner dev_err(DEV, "local disk flush failed with status %d\n", rv); 974b411b363SPhilipp Reisner /* would rather check on EOPNOTSUPP, but that is not reliable. 975b411b363SPhilipp Reisner * don't try again for ANY return value != 0 976b411b363SPhilipp Reisner * if (rv == -EOPNOTSUPP) */ 977b411b363SPhilipp Reisner drbd_bump_write_ordering(mdev, WO_drain_io); 978b411b363SPhilipp Reisner } 979b411b363SPhilipp Reisner put_ldev(mdev); 980b411b363SPhilipp Reisner } 981b411b363SPhilipp Reisner } 982b411b363SPhilipp Reisner 983b411b363SPhilipp Reisner /** 984b411b363SPhilipp Reisner * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. 985b411b363SPhilipp Reisner * @mdev: DRBD device. 986b411b363SPhilipp Reisner * @epoch: Epoch object. 987b411b363SPhilipp Reisner * @ev: Epoch event. 988b411b363SPhilipp Reisner */ 989b411b363SPhilipp Reisner static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev, 990b411b363SPhilipp Reisner struct drbd_epoch *epoch, 991b411b363SPhilipp Reisner enum epoch_event ev) 992b411b363SPhilipp Reisner { 9932451fc3bSPhilipp Reisner int epoch_size; 994b411b363SPhilipp Reisner struct drbd_epoch *next_epoch; 995b411b363SPhilipp Reisner enum finish_epoch rv = FE_STILL_LIVE; 996b411b363SPhilipp Reisner 997b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 998b411b363SPhilipp Reisner do { 999b411b363SPhilipp Reisner next_epoch = NULL; 1000b411b363SPhilipp Reisner 1001b411b363SPhilipp Reisner epoch_size = atomic_read(&epoch->epoch_size); 1002b411b363SPhilipp Reisner 1003b411b363SPhilipp Reisner switch (ev & ~EV_CLEANUP) { 1004b411b363SPhilipp Reisner case EV_PUT: 1005b411b363SPhilipp Reisner atomic_dec(&epoch->active); 1006b411b363SPhilipp Reisner break; 1007b411b363SPhilipp Reisner case EV_GOT_BARRIER_NR: 1008b411b363SPhilipp Reisner set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); 1009b411b363SPhilipp Reisner break; 1010b411b363SPhilipp Reisner case EV_BECAME_LAST: 1011b411b363SPhilipp Reisner /* nothing to do*/ 1012b411b363SPhilipp Reisner break; 1013b411b363SPhilipp Reisner } 1014b411b363SPhilipp Reisner 1015b411b363SPhilipp Reisner if (epoch_size != 0 && 1016b411b363SPhilipp Reisner atomic_read(&epoch->active) == 0 && 10172451fc3bSPhilipp Reisner test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) { 1018b411b363SPhilipp Reisner if (!(ev & EV_CLEANUP)) { 1019b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1020b411b363SPhilipp Reisner drbd_send_b_ack(mdev, epoch->barrier_nr, epoch_size); 1021b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1022b411b363SPhilipp Reisner } 1023b411b363SPhilipp Reisner dec_unacked(mdev); 1024b411b363SPhilipp Reisner 1025b411b363SPhilipp Reisner if (mdev->current_epoch != epoch) { 1026b411b363SPhilipp Reisner next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); 1027b411b363SPhilipp Reisner list_del(&epoch->list); 1028b411b363SPhilipp Reisner ev = EV_BECAME_LAST | (ev & EV_CLEANUP); 1029b411b363SPhilipp Reisner mdev->epochs--; 1030b411b363SPhilipp Reisner kfree(epoch); 1031b411b363SPhilipp Reisner 1032b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1033b411b363SPhilipp Reisner rv = FE_DESTROYED; 1034b411b363SPhilipp Reisner } else { 1035b411b363SPhilipp Reisner epoch->flags = 0; 1036b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1037698f9315SUwe Kleine-König /* atomic_set(&epoch->active, 0); is already zero */ 1038b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1039b411b363SPhilipp Reisner rv = FE_RECYCLED; 10402451fc3bSPhilipp Reisner wake_up(&mdev->ee_wait); 1041b411b363SPhilipp Reisner } 1042b411b363SPhilipp Reisner } 1043b411b363SPhilipp Reisner 1044b411b363SPhilipp Reisner if (!next_epoch) 1045b411b363SPhilipp Reisner break; 1046b411b363SPhilipp Reisner 1047b411b363SPhilipp Reisner epoch = next_epoch; 1048b411b363SPhilipp Reisner } while (1); 1049b411b363SPhilipp Reisner 1050b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1051b411b363SPhilipp Reisner 1052b411b363SPhilipp Reisner return rv; 1053b411b363SPhilipp Reisner } 1054b411b363SPhilipp Reisner 1055b411b363SPhilipp Reisner /** 1056b411b363SPhilipp Reisner * drbd_bump_write_ordering() - Fall back to an other write ordering method 1057b411b363SPhilipp Reisner * @mdev: DRBD device. 1058b411b363SPhilipp Reisner * @wo: Write ordering method to try. 1059b411b363SPhilipp Reisner */ 1060b411b363SPhilipp Reisner void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo) __must_hold(local) 1061b411b363SPhilipp Reisner { 1062b411b363SPhilipp Reisner enum write_ordering_e pwo; 1063b411b363SPhilipp Reisner static char *write_ordering_str[] = { 1064b411b363SPhilipp Reisner [WO_none] = "none", 1065b411b363SPhilipp Reisner [WO_drain_io] = "drain", 1066b411b363SPhilipp Reisner [WO_bdev_flush] = "flush", 1067b411b363SPhilipp Reisner }; 1068b411b363SPhilipp Reisner 1069b411b363SPhilipp Reisner pwo = mdev->write_ordering; 1070b411b363SPhilipp Reisner wo = min(pwo, wo); 1071b411b363SPhilipp Reisner if (wo == WO_bdev_flush && mdev->ldev->dc.no_disk_flush) 1072b411b363SPhilipp Reisner wo = WO_drain_io; 1073b411b363SPhilipp Reisner if (wo == WO_drain_io && mdev->ldev->dc.no_disk_drain) 1074b411b363SPhilipp Reisner wo = WO_none; 1075b411b363SPhilipp Reisner mdev->write_ordering = wo; 10762451fc3bSPhilipp Reisner if (pwo != mdev->write_ordering || wo == WO_bdev_flush) 1077b411b363SPhilipp Reisner dev_info(DEV, "Method to ensure write ordering: %s\n", write_ordering_str[mdev->write_ordering]); 1078b411b363SPhilipp Reisner } 1079b411b363SPhilipp Reisner 1080b411b363SPhilipp Reisner /** 108145bb912bSLars Ellenberg * drbd_submit_ee() 108245bb912bSLars Ellenberg * @mdev: DRBD device. 1083db830c46SAndreas Gruenbacher * @peer_req: peer request 108445bb912bSLars Ellenberg * @rw: flag field, see bio->bi_rw 108510f6d992SLars Ellenberg * 108610f6d992SLars Ellenberg * May spread the pages to multiple bios, 108710f6d992SLars Ellenberg * depending on bio_add_page restrictions. 108810f6d992SLars Ellenberg * 108910f6d992SLars Ellenberg * Returns 0 if all bios have been submitted, 109010f6d992SLars Ellenberg * -ENOMEM if we could not allocate enough bios, 109110f6d992SLars Ellenberg * -ENOSPC (any better suggestion?) if we have not been able to bio_add_page a 109210f6d992SLars Ellenberg * single page to an empty bio (which should never happen and likely indicates 109310f6d992SLars Ellenberg * that the lower level IO stack is in some way broken). This has been observed 109410f6d992SLars Ellenberg * on certain Xen deployments. 109545bb912bSLars Ellenberg */ 109645bb912bSLars Ellenberg /* TODO allocate from our own bio_set. */ 1097db830c46SAndreas Gruenbacher int drbd_submit_ee(struct drbd_conf *mdev, struct drbd_peer_request *peer_req, 109845bb912bSLars Ellenberg const unsigned rw, const int fault_type) 109945bb912bSLars Ellenberg { 110045bb912bSLars Ellenberg struct bio *bios = NULL; 110145bb912bSLars Ellenberg struct bio *bio; 1102db830c46SAndreas Gruenbacher struct page *page = peer_req->pages; 1103db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 1104db830c46SAndreas Gruenbacher unsigned ds = peer_req->i.size; 110545bb912bSLars Ellenberg unsigned n_bios = 0; 110645bb912bSLars Ellenberg unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT; 110710f6d992SLars Ellenberg int err = -ENOMEM; 110845bb912bSLars Ellenberg 110945bb912bSLars Ellenberg /* In most cases, we will only need one bio. But in case the lower 111045bb912bSLars Ellenberg * level restrictions happen to be different at this offset on this 111145bb912bSLars Ellenberg * side than those of the sending peer, we may need to submit the 111245bb912bSLars Ellenberg * request in more than one bio. */ 111345bb912bSLars Ellenberg next_bio: 111445bb912bSLars Ellenberg bio = bio_alloc(GFP_NOIO, nr_pages); 111545bb912bSLars Ellenberg if (!bio) { 111645bb912bSLars Ellenberg dev_err(DEV, "submit_ee: Allocation of a bio failed\n"); 111745bb912bSLars Ellenberg goto fail; 111845bb912bSLars Ellenberg } 1119db830c46SAndreas Gruenbacher /* > peer_req->i.sector, unless this is the first bio */ 112045bb912bSLars Ellenberg bio->bi_sector = sector; 112145bb912bSLars Ellenberg bio->bi_bdev = mdev->ldev->backing_bdev; 112245bb912bSLars Ellenberg bio->bi_rw = rw; 1123db830c46SAndreas Gruenbacher bio->bi_private = peer_req; 112445bb912bSLars Ellenberg bio->bi_end_io = drbd_endio_sec; 112545bb912bSLars Ellenberg 112645bb912bSLars Ellenberg bio->bi_next = bios; 112745bb912bSLars Ellenberg bios = bio; 112845bb912bSLars Ellenberg ++n_bios; 112945bb912bSLars Ellenberg 113045bb912bSLars Ellenberg page_chain_for_each(page) { 113145bb912bSLars Ellenberg unsigned len = min_t(unsigned, ds, PAGE_SIZE); 113245bb912bSLars Ellenberg if (!bio_add_page(bio, page, len, 0)) { 113310f6d992SLars Ellenberg /* A single page must always be possible! 113410f6d992SLars Ellenberg * But in case it fails anyways, 113510f6d992SLars Ellenberg * we deal with it, and complain (below). */ 113610f6d992SLars Ellenberg if (bio->bi_vcnt == 0) { 113710f6d992SLars Ellenberg dev_err(DEV, 113810f6d992SLars Ellenberg "bio_add_page failed for len=%u, " 113910f6d992SLars Ellenberg "bi_vcnt=0 (bi_sector=%llu)\n", 114010f6d992SLars Ellenberg len, (unsigned long long)bio->bi_sector); 114110f6d992SLars Ellenberg err = -ENOSPC; 114210f6d992SLars Ellenberg goto fail; 114310f6d992SLars Ellenberg } 114445bb912bSLars Ellenberg goto next_bio; 114545bb912bSLars Ellenberg } 114645bb912bSLars Ellenberg ds -= len; 114745bb912bSLars Ellenberg sector += len >> 9; 114845bb912bSLars Ellenberg --nr_pages; 114945bb912bSLars Ellenberg } 115045bb912bSLars Ellenberg D_ASSERT(page == NULL); 115145bb912bSLars Ellenberg D_ASSERT(ds == 0); 115245bb912bSLars Ellenberg 1153db830c46SAndreas Gruenbacher atomic_set(&peer_req->pending_bios, n_bios); 115445bb912bSLars Ellenberg do { 115545bb912bSLars Ellenberg bio = bios; 115645bb912bSLars Ellenberg bios = bios->bi_next; 115745bb912bSLars Ellenberg bio->bi_next = NULL; 115845bb912bSLars Ellenberg 115945bb912bSLars Ellenberg drbd_generic_make_request(mdev, fault_type, bio); 116045bb912bSLars Ellenberg } while (bios); 116145bb912bSLars Ellenberg return 0; 116245bb912bSLars Ellenberg 116345bb912bSLars Ellenberg fail: 116445bb912bSLars Ellenberg while (bios) { 116545bb912bSLars Ellenberg bio = bios; 116645bb912bSLars Ellenberg bios = bios->bi_next; 116745bb912bSLars Ellenberg bio_put(bio); 116845bb912bSLars Ellenberg } 116910f6d992SLars Ellenberg return err; 117045bb912bSLars Ellenberg } 117145bb912bSLars Ellenberg 117253840641SAndreas Gruenbacher static void drbd_remove_epoch_entry_interval(struct drbd_conf *mdev, 1173db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req) 117453840641SAndreas Gruenbacher { 1175db830c46SAndreas Gruenbacher struct drbd_interval *i = &peer_req->i; 117653840641SAndreas Gruenbacher 117753840641SAndreas Gruenbacher drbd_remove_interval(&mdev->write_requests, i); 117853840641SAndreas Gruenbacher drbd_clear_interval(i); 117953840641SAndreas Gruenbacher 11806c852becSAndreas Gruenbacher /* Wake up any processes waiting for this peer request to complete. */ 118153840641SAndreas Gruenbacher if (i->waiting) 118253840641SAndreas Gruenbacher wake_up(&mdev->misc_wait); 118353840641SAndreas Gruenbacher } 118453840641SAndreas Gruenbacher 1185d8763023SAndreas Gruenbacher static int receive_Barrier(struct drbd_conf *mdev, enum drbd_packet cmd, 1186d8763023SAndreas Gruenbacher unsigned int data_size) 1187b411b363SPhilipp Reisner { 11882451fc3bSPhilipp Reisner int rv; 1189e42325a5SPhilipp Reisner struct p_barrier *p = &mdev->tconn->data.rbuf.barrier; 1190b411b363SPhilipp Reisner struct drbd_epoch *epoch; 1191b411b363SPhilipp Reisner 1192b411b363SPhilipp Reisner inc_unacked(mdev); 1193b411b363SPhilipp Reisner 1194b411b363SPhilipp Reisner mdev->current_epoch->barrier_nr = p->barrier; 1195b411b363SPhilipp Reisner rv = drbd_may_finish_epoch(mdev, mdev->current_epoch, EV_GOT_BARRIER_NR); 1196b411b363SPhilipp Reisner 1197b411b363SPhilipp Reisner /* P_BARRIER_ACK may imply that the corresponding extent is dropped from 1198b411b363SPhilipp Reisner * the activity log, which means it would not be resynced in case the 1199b411b363SPhilipp Reisner * R_PRIMARY crashes now. 1200b411b363SPhilipp Reisner * Therefore we must send the barrier_ack after the barrier request was 1201b411b363SPhilipp Reisner * completed. */ 1202b411b363SPhilipp Reisner switch (mdev->write_ordering) { 1203b411b363SPhilipp Reisner case WO_none: 1204b411b363SPhilipp Reisner if (rv == FE_RECYCLED) 120581e84650SAndreas Gruenbacher return true; 1206b411b363SPhilipp Reisner 1207b411b363SPhilipp Reisner /* receiver context, in the writeout path of the other node. 1208b411b363SPhilipp Reisner * avoid potential distributed deadlock */ 1209b411b363SPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 12102451fc3bSPhilipp Reisner if (epoch) 12112451fc3bSPhilipp Reisner break; 12122451fc3bSPhilipp Reisner else 1213b411b363SPhilipp Reisner dev_warn(DEV, "Allocation of an epoch failed, slowing down\n"); 12142451fc3bSPhilipp Reisner /* Fall through */ 12152451fc3bSPhilipp Reisner 12162451fc3bSPhilipp Reisner case WO_bdev_flush: 12172451fc3bSPhilipp Reisner case WO_drain_io: 1218b411b363SPhilipp Reisner drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 12192451fc3bSPhilipp Reisner drbd_flush(mdev); 12202451fc3bSPhilipp Reisner 12212451fc3bSPhilipp Reisner if (atomic_read(&mdev->current_epoch->epoch_size)) { 12222451fc3bSPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 12232451fc3bSPhilipp Reisner if (epoch) 12242451fc3bSPhilipp Reisner break; 1225b411b363SPhilipp Reisner } 1226b411b363SPhilipp Reisner 12272451fc3bSPhilipp Reisner epoch = mdev->current_epoch; 12282451fc3bSPhilipp Reisner wait_event(mdev->ee_wait, atomic_read(&epoch->epoch_size) == 0); 12292451fc3bSPhilipp Reisner 12302451fc3bSPhilipp Reisner D_ASSERT(atomic_read(&epoch->active) == 0); 12312451fc3bSPhilipp Reisner D_ASSERT(epoch->flags == 0); 1232b411b363SPhilipp Reisner 123381e84650SAndreas Gruenbacher return true; 12342451fc3bSPhilipp Reisner default: 12352451fc3bSPhilipp Reisner dev_err(DEV, "Strangeness in mdev->write_ordering %d\n", mdev->write_ordering); 123681e84650SAndreas Gruenbacher return false; 1237b411b363SPhilipp Reisner } 1238b411b363SPhilipp Reisner 1239b411b363SPhilipp Reisner epoch->flags = 0; 1240b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1241b411b363SPhilipp Reisner atomic_set(&epoch->active, 0); 1242b411b363SPhilipp Reisner 1243b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1244b411b363SPhilipp Reisner if (atomic_read(&mdev->current_epoch->epoch_size)) { 1245b411b363SPhilipp Reisner list_add(&epoch->list, &mdev->current_epoch->list); 1246b411b363SPhilipp Reisner mdev->current_epoch = epoch; 1247b411b363SPhilipp Reisner mdev->epochs++; 1248b411b363SPhilipp Reisner } else { 1249b411b363SPhilipp Reisner /* The current_epoch got recycled while we allocated this one... */ 1250b411b363SPhilipp Reisner kfree(epoch); 1251b411b363SPhilipp Reisner } 1252b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1253b411b363SPhilipp Reisner 125481e84650SAndreas Gruenbacher return true; 1255b411b363SPhilipp Reisner } 1256b411b363SPhilipp Reisner 1257b411b363SPhilipp Reisner /* used from receive_RSDataReply (recv_resync_read) 1258b411b363SPhilipp Reisner * and from receive_Data */ 1259f6ffca9fSAndreas Gruenbacher static struct drbd_peer_request * 1260f6ffca9fSAndreas Gruenbacher read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, 1261f6ffca9fSAndreas Gruenbacher int data_size) __must_hold(local) 1262b411b363SPhilipp Reisner { 12636666032aSLars Ellenberg const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 1264db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 1265b411b363SPhilipp Reisner struct page *page; 126645bb912bSLars Ellenberg int dgs, ds, rr; 1267a0638456SPhilipp Reisner void *dig_in = mdev->tconn->int_dig_in; 1268a0638456SPhilipp Reisner void *dig_vv = mdev->tconn->int_dig_vv; 12696b4388acSPhilipp Reisner unsigned long *data; 1270b411b363SPhilipp Reisner 1271a0638456SPhilipp Reisner dgs = (mdev->tconn->agreed_pro_version >= 87 && mdev->tconn->integrity_r_tfm) ? 1272a0638456SPhilipp Reisner crypto_hash_digestsize(mdev->tconn->integrity_r_tfm) : 0; 1273b411b363SPhilipp Reisner 1274b411b363SPhilipp Reisner if (dgs) { 1275b411b363SPhilipp Reisner rr = drbd_recv(mdev, dig_in, dgs); 1276b411b363SPhilipp Reisner if (rr != dgs) { 12770ddc5549SLars Ellenberg if (!signal_pending(current)) 12780ddc5549SLars Ellenberg dev_warn(DEV, 12790ddc5549SLars Ellenberg "short read receiving data digest: read %d expected %d\n", 1280b411b363SPhilipp Reisner rr, dgs); 1281b411b363SPhilipp Reisner return NULL; 1282b411b363SPhilipp Reisner } 1283b411b363SPhilipp Reisner } 1284b411b363SPhilipp Reisner 1285b411b363SPhilipp Reisner data_size -= dgs; 1286b411b363SPhilipp Reisner 1287841ce241SAndreas Gruenbacher if (!expect(data_size != 0)) 1288841ce241SAndreas Gruenbacher return NULL; 1289841ce241SAndreas Gruenbacher if (!expect(IS_ALIGNED(data_size, 512))) 1290841ce241SAndreas Gruenbacher return NULL; 1291841ce241SAndreas Gruenbacher if (!expect(data_size <= DRBD_MAX_BIO_SIZE)) 1292841ce241SAndreas Gruenbacher return NULL; 1293b411b363SPhilipp Reisner 12946666032aSLars Ellenberg /* even though we trust out peer, 12956666032aSLars Ellenberg * we sometimes have to double check. */ 12966666032aSLars Ellenberg if (sector + (data_size>>9) > capacity) { 1297fdda6544SLars Ellenberg dev_err(DEV, "request from peer beyond end of local disk: " 1298fdda6544SLars Ellenberg "capacity: %llus < sector: %llus + size: %u\n", 12996666032aSLars Ellenberg (unsigned long long)capacity, 13006666032aSLars Ellenberg (unsigned long long)sector, data_size); 13016666032aSLars Ellenberg return NULL; 13026666032aSLars Ellenberg } 13036666032aSLars Ellenberg 1304b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 1305b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 1306b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 1307db830c46SAndreas Gruenbacher peer_req = drbd_alloc_ee(mdev, id, sector, data_size, GFP_NOIO); 1308db830c46SAndreas Gruenbacher if (!peer_req) 1309b411b363SPhilipp Reisner return NULL; 131045bb912bSLars Ellenberg 1311b411b363SPhilipp Reisner ds = data_size; 1312db830c46SAndreas Gruenbacher page = peer_req->pages; 131345bb912bSLars Ellenberg page_chain_for_each(page) { 131445bb912bSLars Ellenberg unsigned len = min_t(int, ds, PAGE_SIZE); 13156b4388acSPhilipp Reisner data = kmap(page); 131645bb912bSLars Ellenberg rr = drbd_recv(mdev, data, len); 13170cf9d27eSAndreas Gruenbacher if (drbd_insert_fault(mdev, DRBD_FAULT_RECEIVE)) { 13186b4388acSPhilipp Reisner dev_err(DEV, "Fault injection: Corrupting data on receive\n"); 13196b4388acSPhilipp Reisner data[0] = data[0] ^ (unsigned long)-1; 13206b4388acSPhilipp Reisner } 1321b411b363SPhilipp Reisner kunmap(page); 132245bb912bSLars Ellenberg if (rr != len) { 1323db830c46SAndreas Gruenbacher drbd_free_ee(mdev, peer_req); 13240ddc5549SLars Ellenberg if (!signal_pending(current)) 1325b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data: read %d expected %d\n", 132645bb912bSLars Ellenberg rr, len); 1327b411b363SPhilipp Reisner return NULL; 1328b411b363SPhilipp Reisner } 1329b411b363SPhilipp Reisner ds -= rr; 1330b411b363SPhilipp Reisner } 1331b411b363SPhilipp Reisner 1332b411b363SPhilipp Reisner if (dgs) { 1333db830c46SAndreas Gruenbacher drbd_csum_ee(mdev, mdev->tconn->integrity_r_tfm, peer_req, dig_vv); 1334b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1335470be44aSLars Ellenberg dev_err(DEV, "Digest integrity check FAILED: %llus +%u\n", 1336470be44aSLars Ellenberg (unsigned long long)sector, data_size); 1337b411b363SPhilipp Reisner drbd_bcast_ee(mdev, "digest failed", 1338db830c46SAndreas Gruenbacher dgs, dig_in, dig_vv, peer_req); 1339db830c46SAndreas Gruenbacher drbd_free_ee(mdev, peer_req); 1340b411b363SPhilipp Reisner return NULL; 1341b411b363SPhilipp Reisner } 1342b411b363SPhilipp Reisner } 1343b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1344db830c46SAndreas Gruenbacher return peer_req; 1345b411b363SPhilipp Reisner } 1346b411b363SPhilipp Reisner 1347b411b363SPhilipp Reisner /* drbd_drain_block() just takes a data block 1348b411b363SPhilipp Reisner * out of the socket input buffer, and discards it. 1349b411b363SPhilipp Reisner */ 1350b411b363SPhilipp Reisner static int drbd_drain_block(struct drbd_conf *mdev, int data_size) 1351b411b363SPhilipp Reisner { 1352b411b363SPhilipp Reisner struct page *page; 1353b411b363SPhilipp Reisner int rr, rv = 1; 1354b411b363SPhilipp Reisner void *data; 1355b411b363SPhilipp Reisner 1356c3470cdeSLars Ellenberg if (!data_size) 135781e84650SAndreas Gruenbacher return true; 1358c3470cdeSLars Ellenberg 135945bb912bSLars Ellenberg page = drbd_pp_alloc(mdev, 1, 1); 1360b411b363SPhilipp Reisner 1361b411b363SPhilipp Reisner data = kmap(page); 1362b411b363SPhilipp Reisner while (data_size) { 1363b411b363SPhilipp Reisner rr = drbd_recv(mdev, data, min_t(int, data_size, PAGE_SIZE)); 1364b411b363SPhilipp Reisner if (rr != min_t(int, data_size, PAGE_SIZE)) { 1365b411b363SPhilipp Reisner rv = 0; 13660ddc5549SLars Ellenberg if (!signal_pending(current)) 13670ddc5549SLars Ellenberg dev_warn(DEV, 13680ddc5549SLars Ellenberg "short read receiving data: read %d expected %d\n", 1369b411b363SPhilipp Reisner rr, min_t(int, data_size, PAGE_SIZE)); 1370b411b363SPhilipp Reisner break; 1371b411b363SPhilipp Reisner } 1372b411b363SPhilipp Reisner data_size -= rr; 1373b411b363SPhilipp Reisner } 1374b411b363SPhilipp Reisner kunmap(page); 1375435f0740SLars Ellenberg drbd_pp_free(mdev, page, 0); 1376b411b363SPhilipp Reisner return rv; 1377b411b363SPhilipp Reisner } 1378b411b363SPhilipp Reisner 1379b411b363SPhilipp Reisner static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req, 1380b411b363SPhilipp Reisner sector_t sector, int data_size) 1381b411b363SPhilipp Reisner { 1382b411b363SPhilipp Reisner struct bio_vec *bvec; 1383b411b363SPhilipp Reisner struct bio *bio; 1384b411b363SPhilipp Reisner int dgs, rr, i, expect; 1385a0638456SPhilipp Reisner void *dig_in = mdev->tconn->int_dig_in; 1386a0638456SPhilipp Reisner void *dig_vv = mdev->tconn->int_dig_vv; 1387b411b363SPhilipp Reisner 1388a0638456SPhilipp Reisner dgs = (mdev->tconn->agreed_pro_version >= 87 && mdev->tconn->integrity_r_tfm) ? 1389a0638456SPhilipp Reisner crypto_hash_digestsize(mdev->tconn->integrity_r_tfm) : 0; 1390b411b363SPhilipp Reisner 1391b411b363SPhilipp Reisner if (dgs) { 1392b411b363SPhilipp Reisner rr = drbd_recv(mdev, dig_in, dgs); 1393b411b363SPhilipp Reisner if (rr != dgs) { 13940ddc5549SLars Ellenberg if (!signal_pending(current)) 13950ddc5549SLars Ellenberg dev_warn(DEV, 13960ddc5549SLars Ellenberg "short read receiving data reply digest: read %d expected %d\n", 1397b411b363SPhilipp Reisner rr, dgs); 1398b411b363SPhilipp Reisner return 0; 1399b411b363SPhilipp Reisner } 1400b411b363SPhilipp Reisner } 1401b411b363SPhilipp Reisner 1402b411b363SPhilipp Reisner data_size -= dgs; 1403b411b363SPhilipp Reisner 1404b411b363SPhilipp Reisner /* optimistically update recv_cnt. if receiving fails below, 1405b411b363SPhilipp Reisner * we disconnect anyways, and counters will be reset. */ 1406b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1407b411b363SPhilipp Reisner 1408b411b363SPhilipp Reisner bio = req->master_bio; 1409b411b363SPhilipp Reisner D_ASSERT(sector == bio->bi_sector); 1410b411b363SPhilipp Reisner 1411b411b363SPhilipp Reisner bio_for_each_segment(bvec, bio, i) { 1412b411b363SPhilipp Reisner expect = min_t(int, data_size, bvec->bv_len); 1413b411b363SPhilipp Reisner rr = drbd_recv(mdev, 1414b411b363SPhilipp Reisner kmap(bvec->bv_page)+bvec->bv_offset, 1415b411b363SPhilipp Reisner expect); 1416b411b363SPhilipp Reisner kunmap(bvec->bv_page); 1417b411b363SPhilipp Reisner if (rr != expect) { 14180ddc5549SLars Ellenberg if (!signal_pending(current)) 1419b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data reply: " 1420b411b363SPhilipp Reisner "read %d expected %d\n", 1421b411b363SPhilipp Reisner rr, expect); 1422b411b363SPhilipp Reisner return 0; 1423b411b363SPhilipp Reisner } 1424b411b363SPhilipp Reisner data_size -= rr; 1425b411b363SPhilipp Reisner } 1426b411b363SPhilipp Reisner 1427b411b363SPhilipp Reisner if (dgs) { 1428a0638456SPhilipp Reisner drbd_csum_bio(mdev, mdev->tconn->integrity_r_tfm, bio, dig_vv); 1429b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1430b411b363SPhilipp Reisner dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n"); 1431b411b363SPhilipp Reisner return 0; 1432b411b363SPhilipp Reisner } 1433b411b363SPhilipp Reisner } 1434b411b363SPhilipp Reisner 1435b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 1436b411b363SPhilipp Reisner return 1; 1437b411b363SPhilipp Reisner } 1438b411b363SPhilipp Reisner 1439b411b363SPhilipp Reisner /* e_end_resync_block() is called via 1440b411b363SPhilipp Reisner * drbd_process_done_ee() by asender only */ 1441b411b363SPhilipp Reisner static int e_end_resync_block(struct drbd_conf *mdev, struct drbd_work *w, int unused) 1442b411b363SPhilipp Reisner { 1443db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req = (struct drbd_peer_request *)w; 1444db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 1445b411b363SPhilipp Reisner int ok; 1446b411b363SPhilipp Reisner 1447db830c46SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&peer_req->i)); 1448b411b363SPhilipp Reisner 1449db830c46SAndreas Gruenbacher if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { 1450db830c46SAndreas Gruenbacher drbd_set_in_sync(mdev, sector, peer_req->i.size); 1451db830c46SAndreas Gruenbacher ok = drbd_send_ack(mdev, P_RS_WRITE_ACK, peer_req); 1452b411b363SPhilipp Reisner } else { 1453b411b363SPhilipp Reisner /* Record failure to sync */ 1454db830c46SAndreas Gruenbacher drbd_rs_failed_io(mdev, sector, peer_req->i.size); 1455b411b363SPhilipp Reisner 1456db830c46SAndreas Gruenbacher ok = drbd_send_ack(mdev, P_NEG_ACK, peer_req); 1457b411b363SPhilipp Reisner } 1458b411b363SPhilipp Reisner dec_unacked(mdev); 1459b411b363SPhilipp Reisner 1460b411b363SPhilipp Reisner return ok; 1461b411b363SPhilipp Reisner } 1462b411b363SPhilipp Reisner 1463b411b363SPhilipp Reisner static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local) 1464b411b363SPhilipp Reisner { 1465db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 1466b411b363SPhilipp Reisner 1467db830c46SAndreas Gruenbacher peer_req = read_in_block(mdev, ID_SYNCER, sector, data_size); 1468db830c46SAndreas Gruenbacher if (!peer_req) 146945bb912bSLars Ellenberg goto fail; 1470b411b363SPhilipp Reisner 1471b411b363SPhilipp Reisner dec_rs_pending(mdev); 1472b411b363SPhilipp Reisner 1473b411b363SPhilipp Reisner inc_unacked(mdev); 1474b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_resync_block() 1475b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 1476b411b363SPhilipp Reisner 1477db830c46SAndreas Gruenbacher peer_req->w.cb = e_end_resync_block; 147845bb912bSLars Ellenberg 147987eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1480db830c46SAndreas Gruenbacher list_add(&peer_req->w.list, &mdev->sync_ee); 148187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1482b411b363SPhilipp Reisner 14830f0601f4SLars Ellenberg atomic_add(data_size >> 9, &mdev->rs_sect_ev); 1484db830c46SAndreas Gruenbacher if (drbd_submit_ee(mdev, peer_req, WRITE, DRBD_FAULT_RS_WR) == 0) 148581e84650SAndreas Gruenbacher return true; 148645bb912bSLars Ellenberg 148710f6d992SLars Ellenberg /* don't care for the reason here */ 148810f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 148987eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1490db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 149187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 149222cc37a9SLars Ellenberg 1493db830c46SAndreas Gruenbacher drbd_free_ee(mdev, peer_req); 149445bb912bSLars Ellenberg fail: 149545bb912bSLars Ellenberg put_ldev(mdev); 149681e84650SAndreas Gruenbacher return false; 1497b411b363SPhilipp Reisner } 1498b411b363SPhilipp Reisner 1499668eebc6SAndreas Gruenbacher static struct drbd_request * 1500bc9c5c41SAndreas Gruenbacher find_request(struct drbd_conf *mdev, struct rb_root *root, u64 id, 1501bc9c5c41SAndreas Gruenbacher sector_t sector, bool missing_ok, const char *func) 1502668eebc6SAndreas Gruenbacher { 1503668eebc6SAndreas Gruenbacher struct drbd_request *req; 1504668eebc6SAndreas Gruenbacher 1505bc9c5c41SAndreas Gruenbacher /* Request object according to our peer */ 1506bc9c5c41SAndreas Gruenbacher req = (struct drbd_request *)(unsigned long)id; 15075e472264SAndreas Gruenbacher if (drbd_contains_interval(root, sector, &req->i) && req->i.local) 1508668eebc6SAndreas Gruenbacher return req; 1509c3afd8f5SAndreas Gruenbacher if (!missing_ok) { 1510c3afd8f5SAndreas Gruenbacher dev_err(DEV, "%s: failed to find request %lu, sector %llus\n", func, 1511c3afd8f5SAndreas Gruenbacher (unsigned long)id, (unsigned long long)sector); 1512c3afd8f5SAndreas Gruenbacher } 1513668eebc6SAndreas Gruenbacher return NULL; 1514668eebc6SAndreas Gruenbacher } 1515668eebc6SAndreas Gruenbacher 1516d8763023SAndreas Gruenbacher static int receive_DataReply(struct drbd_conf *mdev, enum drbd_packet cmd, 1517d8763023SAndreas Gruenbacher unsigned int data_size) 1518b411b363SPhilipp Reisner { 1519b411b363SPhilipp Reisner struct drbd_request *req; 1520b411b363SPhilipp Reisner sector_t sector; 1521b411b363SPhilipp Reisner int ok; 1522e42325a5SPhilipp Reisner struct p_data *p = &mdev->tconn->data.rbuf.data; 1523b411b363SPhilipp Reisner 1524b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1525b411b363SPhilipp Reisner 152687eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1527bc9c5c41SAndreas Gruenbacher req = find_request(mdev, &mdev->read_requests, p->block_id, sector, false, __func__); 152887eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1529c3afd8f5SAndreas Gruenbacher if (unlikely(!req)) 153081e84650SAndreas Gruenbacher return false; 1531b411b363SPhilipp Reisner 153224c4830cSBart Van Assche /* hlist_del(&req->collision) is done in _req_may_be_done, to avoid 1533b411b363SPhilipp Reisner * special casing it there for the various failure cases. 1534b411b363SPhilipp Reisner * still no race with drbd_fail_pending_reads */ 1535b411b363SPhilipp Reisner ok = recv_dless_read(mdev, req, sector, data_size); 1536b411b363SPhilipp Reisner 1537b411b363SPhilipp Reisner if (ok) 15388554df1cSAndreas Gruenbacher req_mod(req, DATA_RECEIVED); 1539b411b363SPhilipp Reisner /* else: nothing. handled from drbd_disconnect... 1540b411b363SPhilipp Reisner * I don't think we may complete this just yet 1541b411b363SPhilipp Reisner * in case we are "on-disconnect: freeze" */ 1542b411b363SPhilipp Reisner 1543b411b363SPhilipp Reisner return ok; 1544b411b363SPhilipp Reisner } 1545b411b363SPhilipp Reisner 1546d8763023SAndreas Gruenbacher static int receive_RSDataReply(struct drbd_conf *mdev, enum drbd_packet cmd, 1547d8763023SAndreas Gruenbacher unsigned int data_size) 1548b411b363SPhilipp Reisner { 1549b411b363SPhilipp Reisner sector_t sector; 1550b411b363SPhilipp Reisner int ok; 1551e42325a5SPhilipp Reisner struct p_data *p = &mdev->tconn->data.rbuf.data; 1552b411b363SPhilipp Reisner 1553b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1554b411b363SPhilipp Reisner D_ASSERT(p->block_id == ID_SYNCER); 1555b411b363SPhilipp Reisner 1556b411b363SPhilipp Reisner if (get_ldev(mdev)) { 1557b411b363SPhilipp Reisner /* data is submitted to disk within recv_resync_read. 1558b411b363SPhilipp Reisner * corresponding put_ldev done below on error, 15599c50842aSAndreas Gruenbacher * or in drbd_endio_sec. */ 1560b411b363SPhilipp Reisner ok = recv_resync_read(mdev, sector, data_size); 1561b411b363SPhilipp Reisner } else { 1562b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 1563b411b363SPhilipp Reisner dev_err(DEV, "Can not write resync data to local disk.\n"); 1564b411b363SPhilipp Reisner 1565b411b363SPhilipp Reisner ok = drbd_drain_block(mdev, data_size); 1566b411b363SPhilipp Reisner 15672b2bf214SLars Ellenberg drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size); 1568b411b363SPhilipp Reisner } 1569b411b363SPhilipp Reisner 1570778f271dSPhilipp Reisner atomic_add(data_size >> 9, &mdev->rs_sect_in); 1571778f271dSPhilipp Reisner 1572b411b363SPhilipp Reisner return ok; 1573b411b363SPhilipp Reisner } 1574b411b363SPhilipp Reisner 1575b411b363SPhilipp Reisner /* e_end_block() is called via drbd_process_done_ee(). 1576b411b363SPhilipp Reisner * this means this function only runs in the asender thread 1577b411b363SPhilipp Reisner */ 1578b411b363SPhilipp Reisner static int e_end_block(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 1579b411b363SPhilipp Reisner { 1580db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req = (struct drbd_peer_request *)w; 1581db830c46SAndreas Gruenbacher sector_t sector = peer_req->i.sector; 1582b411b363SPhilipp Reisner int ok = 1, pcmd; 1583b411b363SPhilipp Reisner 158489e58e75SPhilipp Reisner if (mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C) { 1585db830c46SAndreas Gruenbacher if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { 1586b411b363SPhilipp Reisner pcmd = (mdev->state.conn >= C_SYNC_SOURCE && 1587b411b363SPhilipp Reisner mdev->state.conn <= C_PAUSED_SYNC_T && 1588db830c46SAndreas Gruenbacher peer_req->flags & EE_MAY_SET_IN_SYNC) ? 1589b411b363SPhilipp Reisner P_RS_WRITE_ACK : P_WRITE_ACK; 1590db830c46SAndreas Gruenbacher ok &= drbd_send_ack(mdev, pcmd, peer_req); 1591b411b363SPhilipp Reisner if (pcmd == P_RS_WRITE_ACK) 1592db830c46SAndreas Gruenbacher drbd_set_in_sync(mdev, sector, peer_req->i.size); 1593b411b363SPhilipp Reisner } else { 1594db830c46SAndreas Gruenbacher ok = drbd_send_ack(mdev, P_NEG_ACK, peer_req); 1595b411b363SPhilipp Reisner /* we expect it to be marked out of sync anyways... 1596b411b363SPhilipp Reisner * maybe assert this? */ 1597b411b363SPhilipp Reisner } 1598b411b363SPhilipp Reisner dec_unacked(mdev); 1599b411b363SPhilipp Reisner } 1600b411b363SPhilipp Reisner /* we delete from the conflict detection hash _after_ we sent out the 1601b411b363SPhilipp Reisner * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ 160289e58e75SPhilipp Reisner if (mdev->tconn->net_conf->two_primaries) { 160387eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1604db830c46SAndreas Gruenbacher D_ASSERT(!drbd_interval_empty(&peer_req->i)); 1605db830c46SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 160687eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1607bb3bfe96SAndreas Gruenbacher } else 1608db830c46SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&peer_req->i)); 1609b411b363SPhilipp Reisner 1610db830c46SAndreas Gruenbacher drbd_may_finish_epoch(mdev, peer_req->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); 1611b411b363SPhilipp Reisner 1612b411b363SPhilipp Reisner return ok; 1613b411b363SPhilipp Reisner } 1614b411b363SPhilipp Reisner 1615b411b363SPhilipp Reisner static int e_send_discard_ack(struct drbd_conf *mdev, struct drbd_work *w, int unused) 1616b411b363SPhilipp Reisner { 1617db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req = (struct drbd_peer_request *)w; 1618b411b363SPhilipp Reisner int ok = 1; 1619b411b363SPhilipp Reisner 162089e58e75SPhilipp Reisner D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C); 1621db830c46SAndreas Gruenbacher ok = drbd_send_ack(mdev, P_DISCARD_ACK, peer_req); 1622b411b363SPhilipp Reisner 162387eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1624db830c46SAndreas Gruenbacher D_ASSERT(!drbd_interval_empty(&peer_req->i)); 1625db830c46SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 162687eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1627b411b363SPhilipp Reisner 1628b411b363SPhilipp Reisner dec_unacked(mdev); 1629b411b363SPhilipp Reisner 1630b411b363SPhilipp Reisner return ok; 1631b411b363SPhilipp Reisner } 1632b411b363SPhilipp Reisner 16333e394da1SAndreas Gruenbacher static bool seq_greater(u32 a, u32 b) 16343e394da1SAndreas Gruenbacher { 16353e394da1SAndreas Gruenbacher /* 16363e394da1SAndreas Gruenbacher * We assume 32-bit wrap-around here. 16373e394da1SAndreas Gruenbacher * For 24-bit wrap-around, we would have to shift: 16383e394da1SAndreas Gruenbacher * a <<= 8; b <<= 8; 16393e394da1SAndreas Gruenbacher */ 16403e394da1SAndreas Gruenbacher return (s32)a - (s32)b > 0; 16413e394da1SAndreas Gruenbacher } 16423e394da1SAndreas Gruenbacher 16433e394da1SAndreas Gruenbacher static u32 seq_max(u32 a, u32 b) 16443e394da1SAndreas Gruenbacher { 16453e394da1SAndreas Gruenbacher return seq_greater(a, b) ? a : b; 16463e394da1SAndreas Gruenbacher } 16473e394da1SAndreas Gruenbacher 164843ae077dSAndreas Gruenbacher static void update_peer_seq(struct drbd_conf *mdev, unsigned int peer_seq) 16493e394da1SAndreas Gruenbacher { 165043ae077dSAndreas Gruenbacher unsigned int old_peer_seq; 16513e394da1SAndreas Gruenbacher 16523e394da1SAndreas Gruenbacher spin_lock(&mdev->peer_seq_lock); 165343ae077dSAndreas Gruenbacher old_peer_seq = mdev->peer_seq; 165443ae077dSAndreas Gruenbacher mdev->peer_seq = seq_max(mdev->peer_seq, peer_seq); 16553e394da1SAndreas Gruenbacher spin_unlock(&mdev->peer_seq_lock); 165643ae077dSAndreas Gruenbacher if (old_peer_seq != peer_seq) 16573e394da1SAndreas Gruenbacher wake_up(&mdev->seq_wait); 16583e394da1SAndreas Gruenbacher } 16593e394da1SAndreas Gruenbacher 1660b411b363SPhilipp Reisner /* Called from receive_Data. 1661b411b363SPhilipp Reisner * Synchronize packets on sock with packets on msock. 1662b411b363SPhilipp Reisner * 1663b411b363SPhilipp Reisner * This is here so even when a P_DATA packet traveling via sock overtook an Ack 1664b411b363SPhilipp Reisner * packet traveling on msock, they are still processed in the order they have 1665b411b363SPhilipp Reisner * been sent. 1666b411b363SPhilipp Reisner * 1667b411b363SPhilipp Reisner * Note: we don't care for Ack packets overtaking P_DATA packets. 1668b411b363SPhilipp Reisner * 1669b411b363SPhilipp Reisner * In case packet_seq is larger than mdev->peer_seq number, there are 1670b411b363SPhilipp Reisner * outstanding packets on the msock. We wait for them to arrive. 1671b411b363SPhilipp Reisner * In case we are the logically next packet, we update mdev->peer_seq 1672b411b363SPhilipp Reisner * ourselves. Correctly handles 32bit wrap around. 1673b411b363SPhilipp Reisner * 1674b411b363SPhilipp Reisner * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, 1675b411b363SPhilipp Reisner * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds 1676b411b363SPhilipp Reisner * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have 1677b411b363SPhilipp Reisner * 1<<9 == 512 seconds aka ages for the 32bit wrap around... 1678b411b363SPhilipp Reisner * 1679b411b363SPhilipp Reisner * returns 0 if we may process the packet, 1680b411b363SPhilipp Reisner * -ERESTARTSYS if we were interrupted (by disconnect signal). */ 1681b411b363SPhilipp Reisner static int drbd_wait_peer_seq(struct drbd_conf *mdev, const u32 packet_seq) 1682b411b363SPhilipp Reisner { 1683b411b363SPhilipp Reisner DEFINE_WAIT(wait); 1684b411b363SPhilipp Reisner unsigned int p_seq; 1685b411b363SPhilipp Reisner long timeout; 1686b411b363SPhilipp Reisner int ret = 0; 1687b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1688b411b363SPhilipp Reisner for (;;) { 1689b411b363SPhilipp Reisner prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE); 16903e394da1SAndreas Gruenbacher if (!seq_greater(packet_seq, mdev->peer_seq + 1)) 1691b411b363SPhilipp Reisner break; 1692b411b363SPhilipp Reisner if (signal_pending(current)) { 1693b411b363SPhilipp Reisner ret = -ERESTARTSYS; 1694b411b363SPhilipp Reisner break; 1695b411b363SPhilipp Reisner } 1696b411b363SPhilipp Reisner p_seq = mdev->peer_seq; 1697b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1698b411b363SPhilipp Reisner timeout = schedule_timeout(30*HZ); 1699b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1700b411b363SPhilipp Reisner if (timeout == 0 && p_seq == mdev->peer_seq) { 1701b411b363SPhilipp Reisner ret = -ETIMEDOUT; 1702b411b363SPhilipp Reisner dev_err(DEV, "ASSERT FAILED waited 30 seconds for sequence update, forcing reconnect\n"); 1703b411b363SPhilipp Reisner break; 1704b411b363SPhilipp Reisner } 1705b411b363SPhilipp Reisner } 1706b411b363SPhilipp Reisner finish_wait(&mdev->seq_wait, &wait); 1707b411b363SPhilipp Reisner if (mdev->peer_seq+1 == packet_seq) 1708b411b363SPhilipp Reisner mdev->peer_seq++; 1709b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1710b411b363SPhilipp Reisner return ret; 1711b411b363SPhilipp Reisner } 1712b411b363SPhilipp Reisner 1713688593c5SLars Ellenberg /* see also bio_flags_to_wire() 1714688593c5SLars Ellenberg * DRBD_REQ_*, because we need to semantically map the flags to data packet 1715688593c5SLars Ellenberg * flags and back. We may replicate to other kernel versions. */ 1716688593c5SLars Ellenberg static unsigned long wire_flags_to_bio(struct drbd_conf *mdev, u32 dpf) 171776d2e7ecSPhilipp Reisner { 171876d2e7ecSPhilipp Reisner return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | 171976d2e7ecSPhilipp Reisner (dpf & DP_FUA ? REQ_FUA : 0) | 1720688593c5SLars Ellenberg (dpf & DP_FLUSH ? REQ_FLUSH : 0) | 172176d2e7ecSPhilipp Reisner (dpf & DP_DISCARD ? REQ_DISCARD : 0); 172276d2e7ecSPhilipp Reisner } 172376d2e7ecSPhilipp Reisner 1724b411b363SPhilipp Reisner /* mirrored write */ 1725d8763023SAndreas Gruenbacher static int receive_Data(struct drbd_conf *mdev, enum drbd_packet cmd, 1726d8763023SAndreas Gruenbacher unsigned int data_size) 1727b411b363SPhilipp Reisner { 1728b411b363SPhilipp Reisner sector_t sector; 1729db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 1730e42325a5SPhilipp Reisner struct p_data *p = &mdev->tconn->data.rbuf.data; 1731b411b363SPhilipp Reisner int rw = WRITE; 1732b411b363SPhilipp Reisner u32 dp_flags; 1733b411b363SPhilipp Reisner 1734b411b363SPhilipp Reisner if (!get_ldev(mdev)) { 1735b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1736b411b363SPhilipp Reisner if (mdev->peer_seq+1 == be32_to_cpu(p->seq_num)) 1737b411b363SPhilipp Reisner mdev->peer_seq++; 1738b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1739b411b363SPhilipp Reisner 17402b2bf214SLars Ellenberg drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size); 1741b411b363SPhilipp Reisner atomic_inc(&mdev->current_epoch->epoch_size); 1742b411b363SPhilipp Reisner return drbd_drain_block(mdev, data_size); 1743b411b363SPhilipp Reisner } 1744b411b363SPhilipp Reisner 1745b411b363SPhilipp Reisner /* get_ldev(mdev) successful. 1746b411b363SPhilipp Reisner * Corresponding put_ldev done either below (on various errors), 17479c50842aSAndreas Gruenbacher * or in drbd_endio_sec, if we successfully submit the data at 1748b411b363SPhilipp Reisner * the end of this function. */ 1749b411b363SPhilipp Reisner 1750b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1751db830c46SAndreas Gruenbacher peer_req = read_in_block(mdev, p->block_id, sector, data_size); 1752db830c46SAndreas Gruenbacher if (!peer_req) { 1753b411b363SPhilipp Reisner put_ldev(mdev); 175481e84650SAndreas Gruenbacher return false; 1755b411b363SPhilipp Reisner } 1756b411b363SPhilipp Reisner 1757db830c46SAndreas Gruenbacher peer_req->w.cb = e_end_block; 1758b411b363SPhilipp Reisner 1759688593c5SLars Ellenberg dp_flags = be32_to_cpu(p->dp_flags); 1760688593c5SLars Ellenberg rw |= wire_flags_to_bio(mdev, dp_flags); 1761688593c5SLars Ellenberg 1762688593c5SLars Ellenberg if (dp_flags & DP_MAY_SET_IN_SYNC) 1763db830c46SAndreas Gruenbacher peer_req->flags |= EE_MAY_SET_IN_SYNC; 1764688593c5SLars Ellenberg 1765b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1766db830c46SAndreas Gruenbacher peer_req->epoch = mdev->current_epoch; 1767db830c46SAndreas Gruenbacher atomic_inc(&peer_req->epoch->epoch_size); 1768db830c46SAndreas Gruenbacher atomic_inc(&peer_req->epoch->active); 1769b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1770b411b363SPhilipp Reisner 1771b411b363SPhilipp Reisner /* I'm the receiver, I do hold a net_cnt reference. */ 177289e58e75SPhilipp Reisner if (!mdev->tconn->net_conf->two_primaries) { 177387eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1774b411b363SPhilipp Reisner } else { 1775b411b363SPhilipp Reisner /* don't get the req_lock yet, 1776b411b363SPhilipp Reisner * we may sleep in drbd_wait_peer_seq */ 1777db830c46SAndreas Gruenbacher const int size = peer_req->i.size; 177825703f83SPhilipp Reisner const int discard = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags); 1779b411b363SPhilipp Reisner DEFINE_WAIT(wait); 1780b411b363SPhilipp Reisner int first; 1781b411b363SPhilipp Reisner 178289e58e75SPhilipp Reisner D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C); 1783b411b363SPhilipp Reisner 1784b411b363SPhilipp Reisner /* conflict detection and handling: 1785b411b363SPhilipp Reisner * 1. wait on the sequence number, 1786b411b363SPhilipp Reisner * in case this data packet overtook ACK packets. 17875e472264SAndreas Gruenbacher * 2. check for conflicting write requests. 1788b411b363SPhilipp Reisner * 1789b411b363SPhilipp Reisner * Note: for two_primaries, we are protocol C, 1790b411b363SPhilipp Reisner * so there cannot be any request that is DONE 1791b411b363SPhilipp Reisner * but still on the transfer log. 1792b411b363SPhilipp Reisner * 1793b411b363SPhilipp Reisner * if no conflicting request is found: 1794b411b363SPhilipp Reisner * submit. 1795b411b363SPhilipp Reisner * 1796b411b363SPhilipp Reisner * if any conflicting request is found 1797b411b363SPhilipp Reisner * that has not yet been acked, 1798b411b363SPhilipp Reisner * AND I have the "discard concurrent writes" flag: 1799b411b363SPhilipp Reisner * queue (via done_ee) the P_DISCARD_ACK; OUT. 1800b411b363SPhilipp Reisner * 1801b411b363SPhilipp Reisner * if any conflicting request is found: 1802b411b363SPhilipp Reisner * block the receiver, waiting on misc_wait 1803b411b363SPhilipp Reisner * until no more conflicting requests are there, 1804b411b363SPhilipp Reisner * or we get interrupted (disconnect). 1805b411b363SPhilipp Reisner * 1806b411b363SPhilipp Reisner * we do not just write after local io completion of those 1807b411b363SPhilipp Reisner * requests, but only after req is done completely, i.e. 1808b411b363SPhilipp Reisner * we wait for the P_DISCARD_ACK to arrive! 1809b411b363SPhilipp Reisner * 1810b411b363SPhilipp Reisner * then proceed normally, i.e. submit. 1811b411b363SPhilipp Reisner */ 1812b411b363SPhilipp Reisner if (drbd_wait_peer_seq(mdev, be32_to_cpu(p->seq_num))) 1813b411b363SPhilipp Reisner goto out_interrupted; 1814b411b363SPhilipp Reisner 181587eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1816b411b363SPhilipp Reisner 1817b411b363SPhilipp Reisner first = 1; 1818b411b363SPhilipp Reisner for (;;) { 1819de696716SAndreas Gruenbacher struct drbd_interval *i; 1820b411b363SPhilipp Reisner int have_unacked = 0; 1821b411b363SPhilipp Reisner int have_conflict = 0; 1822b411b363SPhilipp Reisner prepare_to_wait(&mdev->misc_wait, &wait, 1823b411b363SPhilipp Reisner TASK_INTERRUPTIBLE); 1824de696716SAndreas Gruenbacher 1825de696716SAndreas Gruenbacher i = drbd_find_overlap(&mdev->write_requests, sector, size); 1826de696716SAndreas Gruenbacher if (i) { 1827b411b363SPhilipp Reisner /* only ALERT on first iteration, 1828b411b363SPhilipp Reisner * we may be woken up early... */ 1829b411b363SPhilipp Reisner if (first) 18305e472264SAndreas Gruenbacher dev_alert(DEV, "%s[%u] Concurrent %s write detected!" 1831b411b363SPhilipp Reisner " new: %llus +%u; pending: %llus +%u\n", 1832b411b363SPhilipp Reisner current->comm, current->pid, 18335e472264SAndreas Gruenbacher i->local ? "local" : "remote", 1834b411b363SPhilipp Reisner (unsigned long long)sector, size, 18355e472264SAndreas Gruenbacher (unsigned long long)i->sector, i->size); 18365e472264SAndreas Gruenbacher 18375e472264SAndreas Gruenbacher if (i->local) { 18385e472264SAndreas Gruenbacher struct drbd_request *req2; 18395e472264SAndreas Gruenbacher 18405e472264SAndreas Gruenbacher req2 = container_of(i, struct drbd_request, i); 1841de696716SAndreas Gruenbacher if (req2->rq_state & RQ_NET_PENDING) 1842b411b363SPhilipp Reisner ++have_unacked; 18435e472264SAndreas Gruenbacher } 1844b411b363SPhilipp Reisner ++have_conflict; 1845b411b363SPhilipp Reisner } 1846b411b363SPhilipp Reisner if (!have_conflict) 1847b411b363SPhilipp Reisner break; 1848b411b363SPhilipp Reisner 1849b411b363SPhilipp Reisner /* Discard Ack only for the _first_ iteration */ 1850b411b363SPhilipp Reisner if (first && discard && have_unacked) { 1851b411b363SPhilipp Reisner dev_alert(DEV, "Concurrent write! [DISCARD BY FLAG] sec=%llus\n", 1852b411b363SPhilipp Reisner (unsigned long long)sector); 1853b411b363SPhilipp Reisner inc_unacked(mdev); 1854db830c46SAndreas Gruenbacher peer_req->w.cb = e_send_discard_ack; 1855db830c46SAndreas Gruenbacher list_add_tail(&peer_req->w.list, &mdev->done_ee); 1856b411b363SPhilipp Reisner 185787eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1858b411b363SPhilipp Reisner 1859b411b363SPhilipp Reisner /* we could probably send that P_DISCARD_ACK ourselves, 1860b411b363SPhilipp Reisner * but I don't like the receiver using the msock */ 1861b411b363SPhilipp Reisner 1862b411b363SPhilipp Reisner put_ldev(mdev); 18630625ac19SPhilipp Reisner wake_asender(mdev->tconn); 1864b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 186581e84650SAndreas Gruenbacher return true; 1866b411b363SPhilipp Reisner } 1867b411b363SPhilipp Reisner 1868b411b363SPhilipp Reisner if (signal_pending(current)) { 186987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1870b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 1871b411b363SPhilipp Reisner goto out_interrupted; 1872b411b363SPhilipp Reisner } 1873b411b363SPhilipp Reisner 1874a500c2efSAndreas Gruenbacher /* Indicate to wake up mdev->misc_wait upon completion. */ 187553840641SAndreas Gruenbacher i->waiting = true; 1876a500c2efSAndreas Gruenbacher 187787eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1878b411b363SPhilipp Reisner if (first) { 1879b411b363SPhilipp Reisner first = 0; 1880b411b363SPhilipp Reisner dev_alert(DEV, "Concurrent write! [W AFTERWARDS] " 1881b411b363SPhilipp Reisner "sec=%llus\n", (unsigned long long)sector); 1882b411b363SPhilipp Reisner } else if (discard) { 1883b411b363SPhilipp Reisner /* we had none on the first iteration. 1884b411b363SPhilipp Reisner * there must be none now. */ 1885b411b363SPhilipp Reisner D_ASSERT(have_unacked == 0); 1886b411b363SPhilipp Reisner } 1887b411b363SPhilipp Reisner schedule(); 188887eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1889b411b363SPhilipp Reisner } 1890b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 18915e472264SAndreas Gruenbacher 1892db830c46SAndreas Gruenbacher drbd_insert_interval(&mdev->write_requests, &peer_req->i); 1893b411b363SPhilipp Reisner } 1894b411b363SPhilipp Reisner 1895db830c46SAndreas Gruenbacher list_add(&peer_req->w.list, &mdev->active_ee); 189687eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1897b411b363SPhilipp Reisner 189889e58e75SPhilipp Reisner switch (mdev->tconn->net_conf->wire_protocol) { 1899b411b363SPhilipp Reisner case DRBD_PROT_C: 1900b411b363SPhilipp Reisner inc_unacked(mdev); 1901b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_block() 1902b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 1903b411b363SPhilipp Reisner break; 1904b411b363SPhilipp Reisner case DRBD_PROT_B: 1905b411b363SPhilipp Reisner /* I really don't like it that the receiver thread 1906b411b363SPhilipp Reisner * sends on the msock, but anyways */ 1907db830c46SAndreas Gruenbacher drbd_send_ack(mdev, P_RECV_ACK, peer_req); 1908b411b363SPhilipp Reisner break; 1909b411b363SPhilipp Reisner case DRBD_PROT_A: 1910b411b363SPhilipp Reisner /* nothing to do */ 1911b411b363SPhilipp Reisner break; 1912b411b363SPhilipp Reisner } 1913b411b363SPhilipp Reisner 19146719fb03SLars Ellenberg if (mdev->state.pdsk < D_INCONSISTENT) { 1915b411b363SPhilipp Reisner /* In case we have the only disk of the cluster, */ 1916db830c46SAndreas Gruenbacher drbd_set_out_of_sync(mdev, peer_req->i.sector, peer_req->i.size); 1917db830c46SAndreas Gruenbacher peer_req->flags |= EE_CALL_AL_COMPLETE_IO; 1918db830c46SAndreas Gruenbacher peer_req->flags &= ~EE_MAY_SET_IN_SYNC; 1919db830c46SAndreas Gruenbacher drbd_al_begin_io(mdev, peer_req->i.sector); 1920b411b363SPhilipp Reisner } 1921b411b363SPhilipp Reisner 1922db830c46SAndreas Gruenbacher if (drbd_submit_ee(mdev, peer_req, rw, DRBD_FAULT_DT_WR) == 0) 192381e84650SAndreas Gruenbacher return true; 1924b411b363SPhilipp Reisner 192510f6d992SLars Ellenberg /* don't care for the reason here */ 192610f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 192787eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1928db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 1929db830c46SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, peer_req); 193087eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1931db830c46SAndreas Gruenbacher if (peer_req->flags & EE_CALL_AL_COMPLETE_IO) 1932db830c46SAndreas Gruenbacher drbd_al_complete_io(mdev, peer_req->i.sector); 193322cc37a9SLars Ellenberg 1934b411b363SPhilipp Reisner out_interrupted: 1935db830c46SAndreas Gruenbacher drbd_may_finish_epoch(mdev, peer_req->epoch, EV_PUT + EV_CLEANUP); 1936b411b363SPhilipp Reisner put_ldev(mdev); 1937db830c46SAndreas Gruenbacher drbd_free_ee(mdev, peer_req); 193881e84650SAndreas Gruenbacher return false; 1939b411b363SPhilipp Reisner } 1940b411b363SPhilipp Reisner 19410f0601f4SLars Ellenberg /* We may throttle resync, if the lower device seems to be busy, 19420f0601f4SLars Ellenberg * and current sync rate is above c_min_rate. 19430f0601f4SLars Ellenberg * 19440f0601f4SLars Ellenberg * To decide whether or not the lower device is busy, we use a scheme similar 19450f0601f4SLars Ellenberg * to MD RAID is_mddev_idle(): if the partition stats reveal "significant" 19460f0601f4SLars Ellenberg * (more than 64 sectors) of activity we cannot account for with our own resync 19470f0601f4SLars Ellenberg * activity, it obviously is "busy". 19480f0601f4SLars Ellenberg * 19490f0601f4SLars Ellenberg * The current sync rate used here uses only the most recent two step marks, 19500f0601f4SLars Ellenberg * to have a short time average so we can react faster. 19510f0601f4SLars Ellenberg */ 1952e3555d85SPhilipp Reisner int drbd_rs_should_slow_down(struct drbd_conf *mdev, sector_t sector) 19530f0601f4SLars Ellenberg { 19540f0601f4SLars Ellenberg struct gendisk *disk = mdev->ldev->backing_bdev->bd_contains->bd_disk; 19550f0601f4SLars Ellenberg unsigned long db, dt, dbdt; 1956e3555d85SPhilipp Reisner struct lc_element *tmp; 19570f0601f4SLars Ellenberg int curr_events; 19580f0601f4SLars Ellenberg int throttle = 0; 19590f0601f4SLars Ellenberg 19600f0601f4SLars Ellenberg /* feature disabled? */ 19610f0601f4SLars Ellenberg if (mdev->sync_conf.c_min_rate == 0) 19620f0601f4SLars Ellenberg return 0; 19630f0601f4SLars Ellenberg 1964e3555d85SPhilipp Reisner spin_lock_irq(&mdev->al_lock); 1965e3555d85SPhilipp Reisner tmp = lc_find(mdev->resync, BM_SECT_TO_EXT(sector)); 1966e3555d85SPhilipp Reisner if (tmp) { 1967e3555d85SPhilipp Reisner struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); 1968e3555d85SPhilipp Reisner if (test_bit(BME_PRIORITY, &bm_ext->flags)) { 1969e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 1970e3555d85SPhilipp Reisner return 0; 1971e3555d85SPhilipp Reisner } 1972e3555d85SPhilipp Reisner /* Do not slow down if app IO is already waiting for this extent */ 1973e3555d85SPhilipp Reisner } 1974e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 1975e3555d85SPhilipp Reisner 19760f0601f4SLars Ellenberg curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + 19770f0601f4SLars Ellenberg (int)part_stat_read(&disk->part0, sectors[1]) - 19780f0601f4SLars Ellenberg atomic_read(&mdev->rs_sect_ev); 1979e3555d85SPhilipp Reisner 19800f0601f4SLars Ellenberg if (!mdev->rs_last_events || curr_events - mdev->rs_last_events > 64) { 19810f0601f4SLars Ellenberg unsigned long rs_left; 19820f0601f4SLars Ellenberg int i; 19830f0601f4SLars Ellenberg 19840f0601f4SLars Ellenberg mdev->rs_last_events = curr_events; 19850f0601f4SLars Ellenberg 19860f0601f4SLars Ellenberg /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, 19870f0601f4SLars Ellenberg * approx. */ 19882649f080SLars Ellenberg i = (mdev->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; 19892649f080SLars Ellenberg 19902649f080SLars Ellenberg if (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T) 19912649f080SLars Ellenberg rs_left = mdev->ov_left; 19922649f080SLars Ellenberg else 19930f0601f4SLars Ellenberg rs_left = drbd_bm_total_weight(mdev) - mdev->rs_failed; 19940f0601f4SLars Ellenberg 19950f0601f4SLars Ellenberg dt = ((long)jiffies - (long)mdev->rs_mark_time[i]) / HZ; 19960f0601f4SLars Ellenberg if (!dt) 19970f0601f4SLars Ellenberg dt++; 19980f0601f4SLars Ellenberg db = mdev->rs_mark_left[i] - rs_left; 19990f0601f4SLars Ellenberg dbdt = Bit2KB(db/dt); 20000f0601f4SLars Ellenberg 20010f0601f4SLars Ellenberg if (dbdt > mdev->sync_conf.c_min_rate) 20020f0601f4SLars Ellenberg throttle = 1; 20030f0601f4SLars Ellenberg } 20040f0601f4SLars Ellenberg return throttle; 20050f0601f4SLars Ellenberg } 20060f0601f4SLars Ellenberg 20070f0601f4SLars Ellenberg 2008d8763023SAndreas Gruenbacher static int receive_DataRequest(struct drbd_conf *mdev, enum drbd_packet cmd, 2009d8763023SAndreas Gruenbacher unsigned int digest_size) 2010b411b363SPhilipp Reisner { 2011b411b363SPhilipp Reisner sector_t sector; 2012b411b363SPhilipp Reisner const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 2013db830c46SAndreas Gruenbacher struct drbd_peer_request *peer_req; 2014b411b363SPhilipp Reisner struct digest_info *di = NULL; 2015b18b37beSPhilipp Reisner int size, verb; 2016b411b363SPhilipp Reisner unsigned int fault_type; 2017e42325a5SPhilipp Reisner struct p_block_req *p = &mdev->tconn->data.rbuf.block_req; 2018b411b363SPhilipp Reisner 2019b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 2020b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 2021b411b363SPhilipp Reisner 20221816a2b4SLars Ellenberg if (size <= 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_BIO_SIZE) { 2023b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 2024b411b363SPhilipp Reisner (unsigned long long)sector, size); 202581e84650SAndreas Gruenbacher return false; 2026b411b363SPhilipp Reisner } 2027b411b363SPhilipp Reisner if (sector + (size>>9) > capacity) { 2028b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 2029b411b363SPhilipp Reisner (unsigned long long)sector, size); 203081e84650SAndreas Gruenbacher return false; 2031b411b363SPhilipp Reisner } 2032b411b363SPhilipp Reisner 2033b411b363SPhilipp Reisner if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) { 2034b18b37beSPhilipp Reisner verb = 1; 2035b18b37beSPhilipp Reisner switch (cmd) { 2036b18b37beSPhilipp Reisner case P_DATA_REQUEST: 2037b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_DREPLY, p); 2038b18b37beSPhilipp Reisner break; 2039b18b37beSPhilipp Reisner case P_RS_DATA_REQUEST: 2040b18b37beSPhilipp Reisner case P_CSUM_RS_REQUEST: 2041b18b37beSPhilipp Reisner case P_OV_REQUEST: 2042b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_RS_DREPLY , p); 2043b18b37beSPhilipp Reisner break; 2044b18b37beSPhilipp Reisner case P_OV_REPLY: 2045b18b37beSPhilipp Reisner verb = 0; 2046b18b37beSPhilipp Reisner dec_rs_pending(mdev); 2047b18b37beSPhilipp Reisner drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, ID_IN_SYNC); 2048b18b37beSPhilipp Reisner break; 2049b18b37beSPhilipp Reisner default: 2050b18b37beSPhilipp Reisner dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n", 2051b18b37beSPhilipp Reisner cmdname(cmd)); 2052b18b37beSPhilipp Reisner } 2053b18b37beSPhilipp Reisner if (verb && __ratelimit(&drbd_ratelimit_state)) 2054b411b363SPhilipp Reisner dev_err(DEV, "Can not satisfy peer's read request, " 2055b411b363SPhilipp Reisner "no local data.\n"); 2056b18b37beSPhilipp Reisner 2057a821cc4aSLars Ellenberg /* drain possibly payload */ 2058a821cc4aSLars Ellenberg return drbd_drain_block(mdev, digest_size); 2059b411b363SPhilipp Reisner } 2060b411b363SPhilipp Reisner 2061b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 2062b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 2063b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 2064db830c46SAndreas Gruenbacher peer_req = drbd_alloc_ee(mdev, p->block_id, sector, size, GFP_NOIO); 2065db830c46SAndreas Gruenbacher if (!peer_req) { 2066b411b363SPhilipp Reisner put_ldev(mdev); 206781e84650SAndreas Gruenbacher return false; 2068b411b363SPhilipp Reisner } 2069b411b363SPhilipp Reisner 207002918be2SPhilipp Reisner switch (cmd) { 2071b411b363SPhilipp Reisner case P_DATA_REQUEST: 2072db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_data_req; 2073b411b363SPhilipp Reisner fault_type = DRBD_FAULT_DT_RD; 207480a40e43SLars Ellenberg /* application IO, don't drbd_rs_begin_io */ 207580a40e43SLars Ellenberg goto submit; 207680a40e43SLars Ellenberg 2077b411b363SPhilipp Reisner case P_RS_DATA_REQUEST: 2078db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_rsdata_req; 2079b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 20805f9915bbSLars Ellenberg /* used in the sector offset progress display */ 20815f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 2082b411b363SPhilipp Reisner break; 2083b411b363SPhilipp Reisner 2084b411b363SPhilipp Reisner case P_OV_REPLY: 2085b411b363SPhilipp Reisner case P_CSUM_RS_REQUEST: 2086b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2087b411b363SPhilipp Reisner di = kmalloc(sizeof(*di) + digest_size, GFP_NOIO); 2088b411b363SPhilipp Reisner if (!di) 2089b411b363SPhilipp Reisner goto out_free_e; 2090b411b363SPhilipp Reisner 2091b411b363SPhilipp Reisner di->digest_size = digest_size; 2092b411b363SPhilipp Reisner di->digest = (((char *)di)+sizeof(struct digest_info)); 2093b411b363SPhilipp Reisner 2094db830c46SAndreas Gruenbacher peer_req->digest = di; 2095db830c46SAndreas Gruenbacher peer_req->flags |= EE_HAS_DIGEST; 2096c36c3cedSLars Ellenberg 2097b411b363SPhilipp Reisner if (drbd_recv(mdev, di->digest, digest_size) != digest_size) 2098b411b363SPhilipp Reisner goto out_free_e; 2099b411b363SPhilipp Reisner 210002918be2SPhilipp Reisner if (cmd == P_CSUM_RS_REQUEST) { 210131890f4aSPhilipp Reisner D_ASSERT(mdev->tconn->agreed_pro_version >= 89); 2102db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_csum_rs_req; 21035f9915bbSLars Ellenberg /* used in the sector offset progress display */ 21045f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 210502918be2SPhilipp Reisner } else if (cmd == P_OV_REPLY) { 21062649f080SLars Ellenberg /* track progress, we may need to throttle */ 21072649f080SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_in); 2108db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_ov_reply; 2109b411b363SPhilipp Reisner dec_rs_pending(mdev); 21100f0601f4SLars Ellenberg /* drbd_rs_begin_io done when we sent this request, 21110f0601f4SLars Ellenberg * but accounting still needs to be done. */ 21120f0601f4SLars Ellenberg goto submit_for_resync; 2113b411b363SPhilipp Reisner } 2114b411b363SPhilipp Reisner break; 2115b411b363SPhilipp Reisner 2116b411b363SPhilipp Reisner case P_OV_REQUEST: 2117b411b363SPhilipp Reisner if (mdev->ov_start_sector == ~(sector_t)0 && 211831890f4aSPhilipp Reisner mdev->tconn->agreed_pro_version >= 90) { 2119de228bbaSLars Ellenberg unsigned long now = jiffies; 2120de228bbaSLars Ellenberg int i; 2121b411b363SPhilipp Reisner mdev->ov_start_sector = sector; 2122b411b363SPhilipp Reisner mdev->ov_position = sector; 212330b743a2SLars Ellenberg mdev->ov_left = drbd_bm_bits(mdev) - BM_SECT_TO_BIT(sector); 212430b743a2SLars Ellenberg mdev->rs_total = mdev->ov_left; 2125de228bbaSLars Ellenberg for (i = 0; i < DRBD_SYNC_MARKS; i++) { 2126de228bbaSLars Ellenberg mdev->rs_mark_left[i] = mdev->ov_left; 2127de228bbaSLars Ellenberg mdev->rs_mark_time[i] = now; 2128de228bbaSLars Ellenberg } 2129b411b363SPhilipp Reisner dev_info(DEV, "Online Verify start sector: %llu\n", 2130b411b363SPhilipp Reisner (unsigned long long)sector); 2131b411b363SPhilipp Reisner } 2132db830c46SAndreas Gruenbacher peer_req->w.cb = w_e_end_ov_req; 2133b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2134b411b363SPhilipp Reisner break; 2135b411b363SPhilipp Reisner 2136b411b363SPhilipp Reisner default: 2137b411b363SPhilipp Reisner dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n", 213802918be2SPhilipp Reisner cmdname(cmd)); 2139b411b363SPhilipp Reisner fault_type = DRBD_FAULT_MAX; 214080a40e43SLars Ellenberg goto out_free_e; 2141b411b363SPhilipp Reisner } 2142b411b363SPhilipp Reisner 21430f0601f4SLars Ellenberg /* Throttle, drbd_rs_begin_io and submit should become asynchronous 21440f0601f4SLars Ellenberg * wrt the receiver, but it is not as straightforward as it may seem. 21450f0601f4SLars Ellenberg * Various places in the resync start and stop logic assume resync 21460f0601f4SLars Ellenberg * requests are processed in order, requeuing this on the worker thread 21470f0601f4SLars Ellenberg * introduces a bunch of new code for synchronization between threads. 21480f0601f4SLars Ellenberg * 21490f0601f4SLars Ellenberg * Unlimited throttling before drbd_rs_begin_io may stall the resync 21500f0601f4SLars Ellenberg * "forever", throttling after drbd_rs_begin_io will lock that extent 21510f0601f4SLars Ellenberg * for application writes for the same time. For now, just throttle 21520f0601f4SLars Ellenberg * here, where the rest of the code expects the receiver to sleep for 21530f0601f4SLars Ellenberg * a while, anyways. 21540f0601f4SLars Ellenberg */ 2155b411b363SPhilipp Reisner 21560f0601f4SLars Ellenberg /* Throttle before drbd_rs_begin_io, as that locks out application IO; 21570f0601f4SLars Ellenberg * this defers syncer requests for some time, before letting at least 21580f0601f4SLars Ellenberg * on request through. The resync controller on the receiving side 21590f0601f4SLars Ellenberg * will adapt to the incoming rate accordingly. 21600f0601f4SLars Ellenberg * 21610f0601f4SLars Ellenberg * We cannot throttle here if remote is Primary/SyncTarget: 21620f0601f4SLars Ellenberg * we would also throttle its application reads. 21630f0601f4SLars Ellenberg * In that case, throttling is done on the SyncTarget only. 21640f0601f4SLars Ellenberg */ 2165e3555d85SPhilipp Reisner if (mdev->state.peer != R_PRIMARY && drbd_rs_should_slow_down(mdev, sector)) 2166e3555d85SPhilipp Reisner schedule_timeout_uninterruptible(HZ/10); 2167e3555d85SPhilipp Reisner if (drbd_rs_begin_io(mdev, sector)) 216880a40e43SLars Ellenberg goto out_free_e; 2169b411b363SPhilipp Reisner 21700f0601f4SLars Ellenberg submit_for_resync: 21710f0601f4SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_ev); 21720f0601f4SLars Ellenberg 217380a40e43SLars Ellenberg submit: 2174b411b363SPhilipp Reisner inc_unacked(mdev); 217587eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2176db830c46SAndreas Gruenbacher list_add_tail(&peer_req->w.list, &mdev->read_ee); 217787eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 2178b411b363SPhilipp Reisner 2179db830c46SAndreas Gruenbacher if (drbd_submit_ee(mdev, peer_req, READ, fault_type) == 0) 218081e84650SAndreas Gruenbacher return true; 2181b411b363SPhilipp Reisner 218210f6d992SLars Ellenberg /* don't care for the reason here */ 218310f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 218487eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 2185db830c46SAndreas Gruenbacher list_del(&peer_req->w.list); 218687eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 218722cc37a9SLars Ellenberg /* no drbd_rs_complete_io(), we are dropping the connection anyways */ 218822cc37a9SLars Ellenberg 2189b411b363SPhilipp Reisner out_free_e: 2190b411b363SPhilipp Reisner put_ldev(mdev); 2191db830c46SAndreas Gruenbacher drbd_free_ee(mdev, peer_req); 219281e84650SAndreas Gruenbacher return false; 2193b411b363SPhilipp Reisner } 2194b411b363SPhilipp Reisner 2195b411b363SPhilipp Reisner static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local) 2196b411b363SPhilipp Reisner { 2197b411b363SPhilipp Reisner int self, peer, rv = -100; 2198b411b363SPhilipp Reisner unsigned long ch_self, ch_peer; 2199b411b363SPhilipp Reisner 2200b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & 1; 2201b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & 1; 2202b411b363SPhilipp Reisner 2203b411b363SPhilipp Reisner ch_peer = mdev->p_uuid[UI_SIZE]; 2204b411b363SPhilipp Reisner ch_self = mdev->comm_bm_set; 2205b411b363SPhilipp Reisner 220689e58e75SPhilipp Reisner switch (mdev->tconn->net_conf->after_sb_0p) { 2207b411b363SPhilipp Reisner case ASB_CONSENSUS: 2208b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2209b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2210b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2211b411b363SPhilipp Reisner break; 2212b411b363SPhilipp Reisner case ASB_DISCONNECT: 2213b411b363SPhilipp Reisner break; 2214b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2215b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2216b411b363SPhilipp Reisner rv = -1; 2217b411b363SPhilipp Reisner break; 2218b411b363SPhilipp Reisner } 2219b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2220b411b363SPhilipp Reisner rv = 1; 2221b411b363SPhilipp Reisner break; 2222b411b363SPhilipp Reisner } 2223b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2224b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2225b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2226b411b363SPhilipp Reisner rv = 1; 2227b411b363SPhilipp Reisner break; 2228b411b363SPhilipp Reisner } 2229b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2230b411b363SPhilipp Reisner rv = -1; 2231b411b363SPhilipp Reisner break; 2232b411b363SPhilipp Reisner } 2233b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2234ad19bf6eSLars Ellenberg dev_warn(DEV, "Discard younger/older primary did not find a decision\n" 2235b411b363SPhilipp Reisner "Using discard-least-changes instead\n"); 2236b411b363SPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2237b411b363SPhilipp Reisner if (ch_peer == 0 && ch_self == 0) { 223825703f83SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) 2239b411b363SPhilipp Reisner ? -1 : 1; 2240b411b363SPhilipp Reisner break; 2241b411b363SPhilipp Reisner } else { 2242b411b363SPhilipp Reisner if (ch_peer == 0) { rv = 1; break; } 2243b411b363SPhilipp Reisner if (ch_self == 0) { rv = -1; break; } 2244b411b363SPhilipp Reisner } 224589e58e75SPhilipp Reisner if (mdev->tconn->net_conf->after_sb_0p == ASB_DISCARD_ZERO_CHG) 2246b411b363SPhilipp Reisner break; 2247b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2248b411b363SPhilipp Reisner if (ch_self < ch_peer) 2249b411b363SPhilipp Reisner rv = -1; 2250b411b363SPhilipp Reisner else if (ch_self > ch_peer) 2251b411b363SPhilipp Reisner rv = 1; 2252b411b363SPhilipp Reisner else /* ( ch_self == ch_peer ) */ 2253b411b363SPhilipp Reisner /* Well, then use something else. */ 225425703f83SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) 2255b411b363SPhilipp Reisner ? -1 : 1; 2256b411b363SPhilipp Reisner break; 2257b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2258b411b363SPhilipp Reisner rv = -1; 2259b411b363SPhilipp Reisner break; 2260b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2261b411b363SPhilipp Reisner rv = 1; 2262b411b363SPhilipp Reisner } 2263b411b363SPhilipp Reisner 2264b411b363SPhilipp Reisner return rv; 2265b411b363SPhilipp Reisner } 2266b411b363SPhilipp Reisner 2267b411b363SPhilipp Reisner static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local) 2268b411b363SPhilipp Reisner { 22696184ea21SAndreas Gruenbacher int hg, rv = -100; 2270b411b363SPhilipp Reisner 227189e58e75SPhilipp Reisner switch (mdev->tconn->net_conf->after_sb_1p) { 2272b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2273b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2274b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2275b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2276b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2277b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2278b411b363SPhilipp Reisner break; 2279b411b363SPhilipp Reisner case ASB_DISCONNECT: 2280b411b363SPhilipp Reisner break; 2281b411b363SPhilipp Reisner case ASB_CONSENSUS: 2282b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2283b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_SECONDARY) 2284b411b363SPhilipp Reisner rv = hg; 2285b411b363SPhilipp Reisner if (hg == 1 && mdev->state.role == R_PRIMARY) 2286b411b363SPhilipp Reisner rv = hg; 2287b411b363SPhilipp Reisner break; 2288b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2289b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2290b411b363SPhilipp Reisner break; 2291b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2292b411b363SPhilipp Reisner return mdev->state.role == R_PRIMARY ? 1 : -1; 2293b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2294b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2295b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_PRIMARY) { 2296bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2297bb437946SAndreas Gruenbacher 2298bb437946SAndreas Gruenbacher drbd_set_role(mdev, R_SECONDARY, 0); 2299b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2300b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2301b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2302bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2303bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2304b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2305b411b363SPhilipp Reisner } else { 2306b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2307b411b363SPhilipp Reisner rv = hg; 2308b411b363SPhilipp Reisner } 2309b411b363SPhilipp Reisner } else 2310b411b363SPhilipp Reisner rv = hg; 2311b411b363SPhilipp Reisner } 2312b411b363SPhilipp Reisner 2313b411b363SPhilipp Reisner return rv; 2314b411b363SPhilipp Reisner } 2315b411b363SPhilipp Reisner 2316b411b363SPhilipp Reisner static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local) 2317b411b363SPhilipp Reisner { 23186184ea21SAndreas Gruenbacher int hg, rv = -100; 2319b411b363SPhilipp Reisner 232089e58e75SPhilipp Reisner switch (mdev->tconn->net_conf->after_sb_2p) { 2321b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2322b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2323b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2324b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2325b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2326b411b363SPhilipp Reisner case ASB_CONSENSUS: 2327b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2328b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2329b411b363SPhilipp Reisner break; 2330b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2331b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2332b411b363SPhilipp Reisner break; 2333b411b363SPhilipp Reisner case ASB_DISCONNECT: 2334b411b363SPhilipp Reisner break; 2335b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2336b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2337b411b363SPhilipp Reisner if (hg == -1) { 2338bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2339bb437946SAndreas Gruenbacher 2340b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2341b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2342b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2343bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2344bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2345b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2346b411b363SPhilipp Reisner } else { 2347b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2348b411b363SPhilipp Reisner rv = hg; 2349b411b363SPhilipp Reisner } 2350b411b363SPhilipp Reisner } else 2351b411b363SPhilipp Reisner rv = hg; 2352b411b363SPhilipp Reisner } 2353b411b363SPhilipp Reisner 2354b411b363SPhilipp Reisner return rv; 2355b411b363SPhilipp Reisner } 2356b411b363SPhilipp Reisner 2357b411b363SPhilipp Reisner static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid, 2358b411b363SPhilipp Reisner u64 bits, u64 flags) 2359b411b363SPhilipp Reisner { 2360b411b363SPhilipp Reisner if (!uuid) { 2361b411b363SPhilipp Reisner dev_info(DEV, "%s uuid info vanished while I was looking!\n", text); 2362b411b363SPhilipp Reisner return; 2363b411b363SPhilipp Reisner } 2364b411b363SPhilipp Reisner dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", 2365b411b363SPhilipp Reisner text, 2366b411b363SPhilipp Reisner (unsigned long long)uuid[UI_CURRENT], 2367b411b363SPhilipp Reisner (unsigned long long)uuid[UI_BITMAP], 2368b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_START], 2369b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_END], 2370b411b363SPhilipp Reisner (unsigned long long)bits, 2371b411b363SPhilipp Reisner (unsigned long long)flags); 2372b411b363SPhilipp Reisner } 2373b411b363SPhilipp Reisner 2374b411b363SPhilipp Reisner /* 2375b411b363SPhilipp Reisner 100 after split brain try auto recover 2376b411b363SPhilipp Reisner 2 C_SYNC_SOURCE set BitMap 2377b411b363SPhilipp Reisner 1 C_SYNC_SOURCE use BitMap 2378b411b363SPhilipp Reisner 0 no Sync 2379b411b363SPhilipp Reisner -1 C_SYNC_TARGET use BitMap 2380b411b363SPhilipp Reisner -2 C_SYNC_TARGET set BitMap 2381b411b363SPhilipp Reisner -100 after split brain, disconnect 2382b411b363SPhilipp Reisner -1000 unrelated data 23834a23f264SPhilipp Reisner -1091 requires proto 91 23844a23f264SPhilipp Reisner -1096 requires proto 96 2385b411b363SPhilipp Reisner */ 2386b411b363SPhilipp Reisner static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local) 2387b411b363SPhilipp Reisner { 2388b411b363SPhilipp Reisner u64 self, peer; 2389b411b363SPhilipp Reisner int i, j; 2390b411b363SPhilipp Reisner 2391b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2392b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2393b411b363SPhilipp Reisner 2394b411b363SPhilipp Reisner *rule_nr = 10; 2395b411b363SPhilipp Reisner if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) 2396b411b363SPhilipp Reisner return 0; 2397b411b363SPhilipp Reisner 2398b411b363SPhilipp Reisner *rule_nr = 20; 2399b411b363SPhilipp Reisner if ((self == UUID_JUST_CREATED || self == (u64)0) && 2400b411b363SPhilipp Reisner peer != UUID_JUST_CREATED) 2401b411b363SPhilipp Reisner return -2; 2402b411b363SPhilipp Reisner 2403b411b363SPhilipp Reisner *rule_nr = 30; 2404b411b363SPhilipp Reisner if (self != UUID_JUST_CREATED && 2405b411b363SPhilipp Reisner (peer == UUID_JUST_CREATED || peer == (u64)0)) 2406b411b363SPhilipp Reisner return 2; 2407b411b363SPhilipp Reisner 2408b411b363SPhilipp Reisner if (self == peer) { 2409b411b363SPhilipp Reisner int rct, dc; /* roles at crash time */ 2410b411b363SPhilipp Reisner 2411b411b363SPhilipp Reisner if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) { 2412b411b363SPhilipp Reisner 241331890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 24144a23f264SPhilipp Reisner return -1091; 2415b411b363SPhilipp Reisner 2416b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) && 2417b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { 2418b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n"); 2419b411b363SPhilipp Reisner drbd_uuid_set_bm(mdev, 0UL); 2420b411b363SPhilipp Reisner 2421b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2422b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2423b411b363SPhilipp Reisner *rule_nr = 34; 2424b411b363SPhilipp Reisner } else { 2425b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n"); 2426b411b363SPhilipp Reisner *rule_nr = 36; 2427b411b363SPhilipp Reisner } 2428b411b363SPhilipp Reisner 2429b411b363SPhilipp Reisner return 1; 2430b411b363SPhilipp Reisner } 2431b411b363SPhilipp Reisner 2432b411b363SPhilipp Reisner if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) { 2433b411b363SPhilipp Reisner 243431890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 24354a23f264SPhilipp Reisner return -1091; 2436b411b363SPhilipp Reisner 2437b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) && 2438b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) { 2439b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); 2440b411b363SPhilipp Reisner 2441b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START]; 2442b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP]; 2443b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = 0UL; 2444b411b363SPhilipp Reisner 2445b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2446b411b363SPhilipp Reisner *rule_nr = 35; 2447b411b363SPhilipp Reisner } else { 2448b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n"); 2449b411b363SPhilipp Reisner *rule_nr = 37; 2450b411b363SPhilipp Reisner } 2451b411b363SPhilipp Reisner 2452b411b363SPhilipp Reisner return -1; 2453b411b363SPhilipp Reisner } 2454b411b363SPhilipp Reisner 2455b411b363SPhilipp Reisner /* Common power [off|failure] */ 2456b411b363SPhilipp Reisner rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) + 2457b411b363SPhilipp Reisner (mdev->p_uuid[UI_FLAGS] & 2); 2458b411b363SPhilipp Reisner /* lowest bit is set when we were primary, 2459b411b363SPhilipp Reisner * next bit (weight 2) is set when peer was primary */ 2460b411b363SPhilipp Reisner *rule_nr = 40; 2461b411b363SPhilipp Reisner 2462b411b363SPhilipp Reisner switch (rct) { 2463b411b363SPhilipp Reisner case 0: /* !self_pri && !peer_pri */ return 0; 2464b411b363SPhilipp Reisner case 1: /* self_pri && !peer_pri */ return 1; 2465b411b363SPhilipp Reisner case 2: /* !self_pri && peer_pri */ return -1; 2466b411b363SPhilipp Reisner case 3: /* self_pri && peer_pri */ 246725703f83SPhilipp Reisner dc = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags); 2468b411b363SPhilipp Reisner return dc ? -1 : 1; 2469b411b363SPhilipp Reisner } 2470b411b363SPhilipp Reisner } 2471b411b363SPhilipp Reisner 2472b411b363SPhilipp Reisner *rule_nr = 50; 2473b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2474b411b363SPhilipp Reisner if (self == peer) 2475b411b363SPhilipp Reisner return -1; 2476b411b363SPhilipp Reisner 2477b411b363SPhilipp Reisner *rule_nr = 51; 2478b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); 2479b411b363SPhilipp Reisner if (self == peer) { 248031890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 96 ? 24814a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == 24824a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) : 24834a23f264SPhilipp Reisner peer + UUID_NEW_BM_OFFSET == (mdev->p_uuid[UI_BITMAP] & ~((u64)1))) { 2484b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2485b411b363SPhilipp Reisner resync as sync source modifications of the peer's UUIDs. */ 2486b411b363SPhilipp Reisner 248731890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 24884a23f264SPhilipp Reisner return -1091; 2489b411b363SPhilipp Reisner 2490b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START]; 2491b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1]; 24924a23f264SPhilipp Reisner 24934a23f264SPhilipp Reisner dev_info(DEV, "Did not got last syncUUID packet, corrected:\n"); 24944a23f264SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 24954a23f264SPhilipp Reisner 2496b411b363SPhilipp Reisner return -1; 2497b411b363SPhilipp Reisner } 2498b411b363SPhilipp Reisner } 2499b411b363SPhilipp Reisner 2500b411b363SPhilipp Reisner *rule_nr = 60; 2501b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2502b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2503b411b363SPhilipp Reisner peer = mdev->p_uuid[i] & ~((u64)1); 2504b411b363SPhilipp Reisner if (self == peer) 2505b411b363SPhilipp Reisner return -2; 2506b411b363SPhilipp Reisner } 2507b411b363SPhilipp Reisner 2508b411b363SPhilipp Reisner *rule_nr = 70; 2509b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2510b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2511b411b363SPhilipp Reisner if (self == peer) 2512b411b363SPhilipp Reisner return 1; 2513b411b363SPhilipp Reisner 2514b411b363SPhilipp Reisner *rule_nr = 71; 2515b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); 2516b411b363SPhilipp Reisner if (self == peer) { 251731890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 96 ? 25184a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == 25194a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) : 25204a23f264SPhilipp Reisner self + UUID_NEW_BM_OFFSET == (mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) { 2521b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2522b411b363SPhilipp Reisner resync as sync source modifications of our UUIDs. */ 2523b411b363SPhilipp Reisner 252431890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 25254a23f264SPhilipp Reisner return -1091; 2526b411b363SPhilipp Reisner 2527b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]); 2528b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]); 2529b411b363SPhilipp Reisner 25304a23f264SPhilipp Reisner dev_info(DEV, "Last syncUUID did not get through, corrected:\n"); 2531b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2532b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2533b411b363SPhilipp Reisner 2534b411b363SPhilipp Reisner return 1; 2535b411b363SPhilipp Reisner } 2536b411b363SPhilipp Reisner } 2537b411b363SPhilipp Reisner 2538b411b363SPhilipp Reisner 2539b411b363SPhilipp Reisner *rule_nr = 80; 2540d8c2a36bSPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2541b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2542b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2543b411b363SPhilipp Reisner if (self == peer) 2544b411b363SPhilipp Reisner return 2; 2545b411b363SPhilipp Reisner } 2546b411b363SPhilipp Reisner 2547b411b363SPhilipp Reisner *rule_nr = 90; 2548b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2549b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2550b411b363SPhilipp Reisner if (self == peer && self != ((u64)0)) 2551b411b363SPhilipp Reisner return 100; 2552b411b363SPhilipp Reisner 2553b411b363SPhilipp Reisner *rule_nr = 100; 2554b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2555b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2556b411b363SPhilipp Reisner for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { 2557b411b363SPhilipp Reisner peer = mdev->p_uuid[j] & ~((u64)1); 2558b411b363SPhilipp Reisner if (self == peer) 2559b411b363SPhilipp Reisner return -100; 2560b411b363SPhilipp Reisner } 2561b411b363SPhilipp Reisner } 2562b411b363SPhilipp Reisner 2563b411b363SPhilipp Reisner return -1000; 2564b411b363SPhilipp Reisner } 2565b411b363SPhilipp Reisner 2566b411b363SPhilipp Reisner /* drbd_sync_handshake() returns the new conn state on success, or 2567b411b363SPhilipp Reisner CONN_MASK (-1) on failure. 2568b411b363SPhilipp Reisner */ 2569b411b363SPhilipp Reisner static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role, 2570b411b363SPhilipp Reisner enum drbd_disk_state peer_disk) __must_hold(local) 2571b411b363SPhilipp Reisner { 2572b411b363SPhilipp Reisner int hg, rule_nr; 2573b411b363SPhilipp Reisner enum drbd_conns rv = C_MASK; 2574b411b363SPhilipp Reisner enum drbd_disk_state mydisk; 2575b411b363SPhilipp Reisner 2576b411b363SPhilipp Reisner mydisk = mdev->state.disk; 2577b411b363SPhilipp Reisner if (mydisk == D_NEGOTIATING) 2578b411b363SPhilipp Reisner mydisk = mdev->new_state_tmp.disk; 2579b411b363SPhilipp Reisner 2580b411b363SPhilipp Reisner dev_info(DEV, "drbd_sync_handshake:\n"); 2581b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0); 2582b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, 2583b411b363SPhilipp Reisner mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2584b411b363SPhilipp Reisner 2585b411b363SPhilipp Reisner hg = drbd_uuid_compare(mdev, &rule_nr); 2586b411b363SPhilipp Reisner 2587b411b363SPhilipp Reisner dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr); 2588b411b363SPhilipp Reisner 2589b411b363SPhilipp Reisner if (hg == -1000) { 2590b411b363SPhilipp Reisner dev_alert(DEV, "Unrelated data, aborting!\n"); 2591b411b363SPhilipp Reisner return C_MASK; 2592b411b363SPhilipp Reisner } 25934a23f264SPhilipp Reisner if (hg < -1000) { 25944a23f264SPhilipp Reisner dev_alert(DEV, "To resolve this both sides have to support at least protocol %d\n", -hg - 1000); 2595b411b363SPhilipp Reisner return C_MASK; 2596b411b363SPhilipp Reisner } 2597b411b363SPhilipp Reisner 2598b411b363SPhilipp Reisner if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || 2599b411b363SPhilipp Reisner (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { 2600b411b363SPhilipp Reisner int f = (hg == -100) || abs(hg) == 2; 2601b411b363SPhilipp Reisner hg = mydisk > D_INCONSISTENT ? 1 : -1; 2602b411b363SPhilipp Reisner if (f) 2603b411b363SPhilipp Reisner hg = hg*2; 2604b411b363SPhilipp Reisner dev_info(DEV, "Becoming sync %s due to disk states.\n", 2605b411b363SPhilipp Reisner hg > 0 ? "source" : "target"); 2606b411b363SPhilipp Reisner } 2607b411b363SPhilipp Reisner 26083a11a487SAdam Gandelman if (abs(hg) == 100) 26093a11a487SAdam Gandelman drbd_khelper(mdev, "initial-split-brain"); 26103a11a487SAdam Gandelman 261189e58e75SPhilipp Reisner if (hg == 100 || (hg == -100 && mdev->tconn->net_conf->always_asbp)) { 2612b411b363SPhilipp Reisner int pcount = (mdev->state.role == R_PRIMARY) 2613b411b363SPhilipp Reisner + (peer_role == R_PRIMARY); 2614b411b363SPhilipp Reisner int forced = (hg == -100); 2615b411b363SPhilipp Reisner 2616b411b363SPhilipp Reisner switch (pcount) { 2617b411b363SPhilipp Reisner case 0: 2618b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2619b411b363SPhilipp Reisner break; 2620b411b363SPhilipp Reisner case 1: 2621b411b363SPhilipp Reisner hg = drbd_asb_recover_1p(mdev); 2622b411b363SPhilipp Reisner break; 2623b411b363SPhilipp Reisner case 2: 2624b411b363SPhilipp Reisner hg = drbd_asb_recover_2p(mdev); 2625b411b363SPhilipp Reisner break; 2626b411b363SPhilipp Reisner } 2627b411b363SPhilipp Reisner if (abs(hg) < 100) { 2628b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, %d primaries, " 2629b411b363SPhilipp Reisner "automatically solved. Sync from %s node\n", 2630b411b363SPhilipp Reisner pcount, (hg < 0) ? "peer" : "this"); 2631b411b363SPhilipp Reisner if (forced) { 2632b411b363SPhilipp Reisner dev_warn(DEV, "Doing a full sync, since" 2633b411b363SPhilipp Reisner " UUIDs where ambiguous.\n"); 2634b411b363SPhilipp Reisner hg = hg*2; 2635b411b363SPhilipp Reisner } 2636b411b363SPhilipp Reisner } 2637b411b363SPhilipp Reisner } 2638b411b363SPhilipp Reisner 2639b411b363SPhilipp Reisner if (hg == -100) { 264089e58e75SPhilipp Reisner if (mdev->tconn->net_conf->want_lose && !(mdev->p_uuid[UI_FLAGS]&1)) 2641b411b363SPhilipp Reisner hg = -1; 264289e58e75SPhilipp Reisner if (!mdev->tconn->net_conf->want_lose && (mdev->p_uuid[UI_FLAGS]&1)) 2643b411b363SPhilipp Reisner hg = 1; 2644b411b363SPhilipp Reisner 2645b411b363SPhilipp Reisner if (abs(hg) < 100) 2646b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, manually solved. " 2647b411b363SPhilipp Reisner "Sync from %s node\n", 2648b411b363SPhilipp Reisner (hg < 0) ? "peer" : "this"); 2649b411b363SPhilipp Reisner } 2650b411b363SPhilipp Reisner 2651b411b363SPhilipp Reisner if (hg == -100) { 2652580b9767SLars Ellenberg /* FIXME this log message is not correct if we end up here 2653580b9767SLars Ellenberg * after an attempted attach on a diskless node. 2654580b9767SLars Ellenberg * We just refuse to attach -- well, we drop the "connection" 2655580b9767SLars Ellenberg * to that disk, in a way... */ 26563a11a487SAdam Gandelman dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n"); 2657b411b363SPhilipp Reisner drbd_khelper(mdev, "split-brain"); 2658b411b363SPhilipp Reisner return C_MASK; 2659b411b363SPhilipp Reisner } 2660b411b363SPhilipp Reisner 2661b411b363SPhilipp Reisner if (hg > 0 && mydisk <= D_INCONSISTENT) { 2662b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n"); 2663b411b363SPhilipp Reisner return C_MASK; 2664b411b363SPhilipp Reisner } 2665b411b363SPhilipp Reisner 2666b411b363SPhilipp Reisner if (hg < 0 && /* by intention we do not use mydisk here. */ 2667b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) { 266889e58e75SPhilipp Reisner switch (mdev->tconn->net_conf->rr_conflict) { 2669b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2670b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost"); 2671b411b363SPhilipp Reisner /* fall through */ 2672b411b363SPhilipp Reisner case ASB_DISCONNECT: 2673b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncTarget, but I am primary!\n"); 2674b411b363SPhilipp Reisner return C_MASK; 2675b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2676b411b363SPhilipp Reisner dev_warn(DEV, "Becoming SyncTarget, violating the stable-data" 2677b411b363SPhilipp Reisner "assumption\n"); 2678b411b363SPhilipp Reisner } 2679b411b363SPhilipp Reisner } 2680b411b363SPhilipp Reisner 268189e58e75SPhilipp Reisner if (mdev->tconn->net_conf->dry_run || test_bit(CONN_DRY_RUN, &mdev->flags)) { 2682cf14c2e9SPhilipp Reisner if (hg == 0) 2683cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n"); 2684cf14c2e9SPhilipp Reisner else 2685cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.", 2686cf14c2e9SPhilipp Reisner drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), 2687cf14c2e9SPhilipp Reisner abs(hg) >= 2 ? "full" : "bit-map based"); 2688cf14c2e9SPhilipp Reisner return C_MASK; 2689cf14c2e9SPhilipp Reisner } 2690cf14c2e9SPhilipp Reisner 2691b411b363SPhilipp Reisner if (abs(hg) >= 2) { 2692b411b363SPhilipp Reisner dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); 269320ceb2b2SLars Ellenberg if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake", 269420ceb2b2SLars Ellenberg BM_LOCKED_SET_ALLOWED)) 2695b411b363SPhilipp Reisner return C_MASK; 2696b411b363SPhilipp Reisner } 2697b411b363SPhilipp Reisner 2698b411b363SPhilipp Reisner if (hg > 0) { /* become sync source. */ 2699b411b363SPhilipp Reisner rv = C_WF_BITMAP_S; 2700b411b363SPhilipp Reisner } else if (hg < 0) { /* become sync target */ 2701b411b363SPhilipp Reisner rv = C_WF_BITMAP_T; 2702b411b363SPhilipp Reisner } else { 2703b411b363SPhilipp Reisner rv = C_CONNECTED; 2704b411b363SPhilipp Reisner if (drbd_bm_total_weight(mdev)) { 2705b411b363SPhilipp Reisner dev_info(DEV, "No resync, but %lu bits in bitmap!\n", 2706b411b363SPhilipp Reisner drbd_bm_total_weight(mdev)); 2707b411b363SPhilipp Reisner } 2708b411b363SPhilipp Reisner } 2709b411b363SPhilipp Reisner 2710b411b363SPhilipp Reisner return rv; 2711b411b363SPhilipp Reisner } 2712b411b363SPhilipp Reisner 2713b411b363SPhilipp Reisner /* returns 1 if invalid */ 2714b411b363SPhilipp Reisner static int cmp_after_sb(enum drbd_after_sb_p peer, enum drbd_after_sb_p self) 2715b411b363SPhilipp Reisner { 2716b411b363SPhilipp Reisner /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ 2717b411b363SPhilipp Reisner if ((peer == ASB_DISCARD_REMOTE && self == ASB_DISCARD_LOCAL) || 2718b411b363SPhilipp Reisner (self == ASB_DISCARD_REMOTE && peer == ASB_DISCARD_LOCAL)) 2719b411b363SPhilipp Reisner return 0; 2720b411b363SPhilipp Reisner 2721b411b363SPhilipp Reisner /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ 2722b411b363SPhilipp Reisner if (peer == ASB_DISCARD_REMOTE || peer == ASB_DISCARD_LOCAL || 2723b411b363SPhilipp Reisner self == ASB_DISCARD_REMOTE || self == ASB_DISCARD_LOCAL) 2724b411b363SPhilipp Reisner return 1; 2725b411b363SPhilipp Reisner 2726b411b363SPhilipp Reisner /* everything else is valid if they are equal on both sides. */ 2727b411b363SPhilipp Reisner if (peer == self) 2728b411b363SPhilipp Reisner return 0; 2729b411b363SPhilipp Reisner 2730b411b363SPhilipp Reisner /* everything es is invalid. */ 2731b411b363SPhilipp Reisner return 1; 2732b411b363SPhilipp Reisner } 2733b411b363SPhilipp Reisner 2734d8763023SAndreas Gruenbacher static int receive_protocol(struct drbd_conf *mdev, enum drbd_packet cmd, 2735d8763023SAndreas Gruenbacher unsigned int data_size) 2736b411b363SPhilipp Reisner { 2737e42325a5SPhilipp Reisner struct p_protocol *p = &mdev->tconn->data.rbuf.protocol; 2738b411b363SPhilipp Reisner int p_proto, p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; 2739cf14c2e9SPhilipp Reisner int p_want_lose, p_two_primaries, cf; 2740b411b363SPhilipp Reisner char p_integrity_alg[SHARED_SECRET_MAX] = ""; 2741b411b363SPhilipp Reisner 2742b411b363SPhilipp Reisner p_proto = be32_to_cpu(p->protocol); 2743b411b363SPhilipp Reisner p_after_sb_0p = be32_to_cpu(p->after_sb_0p); 2744b411b363SPhilipp Reisner p_after_sb_1p = be32_to_cpu(p->after_sb_1p); 2745b411b363SPhilipp Reisner p_after_sb_2p = be32_to_cpu(p->after_sb_2p); 2746b411b363SPhilipp Reisner p_two_primaries = be32_to_cpu(p->two_primaries); 2747cf14c2e9SPhilipp Reisner cf = be32_to_cpu(p->conn_flags); 2748cf14c2e9SPhilipp Reisner p_want_lose = cf & CF_WANT_LOSE; 2749cf14c2e9SPhilipp Reisner 2750cf14c2e9SPhilipp Reisner clear_bit(CONN_DRY_RUN, &mdev->flags); 2751cf14c2e9SPhilipp Reisner 2752cf14c2e9SPhilipp Reisner if (cf & CF_DRY_RUN) 2753cf14c2e9SPhilipp Reisner set_bit(CONN_DRY_RUN, &mdev->flags); 2754b411b363SPhilipp Reisner 275589e58e75SPhilipp Reisner if (p_proto != mdev->tconn->net_conf->wire_protocol) { 2756b411b363SPhilipp Reisner dev_err(DEV, "incompatible communication protocols\n"); 2757b411b363SPhilipp Reisner goto disconnect; 2758b411b363SPhilipp Reisner } 2759b411b363SPhilipp Reisner 276089e58e75SPhilipp Reisner if (cmp_after_sb(p_after_sb_0p, mdev->tconn->net_conf->after_sb_0p)) { 2761b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-0pri settings\n"); 2762b411b363SPhilipp Reisner goto disconnect; 2763b411b363SPhilipp Reisner } 2764b411b363SPhilipp Reisner 276589e58e75SPhilipp Reisner if (cmp_after_sb(p_after_sb_1p, mdev->tconn->net_conf->after_sb_1p)) { 2766b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-1pri settings\n"); 2767b411b363SPhilipp Reisner goto disconnect; 2768b411b363SPhilipp Reisner } 2769b411b363SPhilipp Reisner 277089e58e75SPhilipp Reisner if (cmp_after_sb(p_after_sb_2p, mdev->tconn->net_conf->after_sb_2p)) { 2771b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-2pri settings\n"); 2772b411b363SPhilipp Reisner goto disconnect; 2773b411b363SPhilipp Reisner } 2774b411b363SPhilipp Reisner 277589e58e75SPhilipp Reisner if (p_want_lose && mdev->tconn->net_conf->want_lose) { 2776b411b363SPhilipp Reisner dev_err(DEV, "both sides have the 'want_lose' flag set\n"); 2777b411b363SPhilipp Reisner goto disconnect; 2778b411b363SPhilipp Reisner } 2779b411b363SPhilipp Reisner 278089e58e75SPhilipp Reisner if (p_two_primaries != mdev->tconn->net_conf->two_primaries) { 2781b411b363SPhilipp Reisner dev_err(DEV, "incompatible setting of the two-primaries options\n"); 2782b411b363SPhilipp Reisner goto disconnect; 2783b411b363SPhilipp Reisner } 2784b411b363SPhilipp Reisner 278531890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version >= 87) { 278689e58e75SPhilipp Reisner unsigned char *my_alg = mdev->tconn->net_conf->integrity_alg; 2787b411b363SPhilipp Reisner 2788b411b363SPhilipp Reisner if (drbd_recv(mdev, p_integrity_alg, data_size) != data_size) 278981e84650SAndreas Gruenbacher return false; 2790b411b363SPhilipp Reisner 2791b411b363SPhilipp Reisner p_integrity_alg[SHARED_SECRET_MAX-1] = 0; 2792b411b363SPhilipp Reisner if (strcmp(p_integrity_alg, my_alg)) { 2793b411b363SPhilipp Reisner dev_err(DEV, "incompatible setting of the data-integrity-alg\n"); 2794b411b363SPhilipp Reisner goto disconnect; 2795b411b363SPhilipp Reisner } 2796b411b363SPhilipp Reisner dev_info(DEV, "data-integrity-alg: %s\n", 2797b411b363SPhilipp Reisner my_alg[0] ? my_alg : (unsigned char *)"<not-used>"); 2798b411b363SPhilipp Reisner } 2799b411b363SPhilipp Reisner 280081e84650SAndreas Gruenbacher return true; 2801b411b363SPhilipp Reisner 2802b411b363SPhilipp Reisner disconnect: 2803b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 280481e84650SAndreas Gruenbacher return false; 2805b411b363SPhilipp Reisner } 2806b411b363SPhilipp Reisner 2807b411b363SPhilipp Reisner /* helper function 2808b411b363SPhilipp Reisner * input: alg name, feature name 2809b411b363SPhilipp Reisner * return: NULL (alg name was "") 2810b411b363SPhilipp Reisner * ERR_PTR(error) if something goes wrong 2811b411b363SPhilipp Reisner * or the crypto hash ptr, if it worked out ok. */ 2812b411b363SPhilipp Reisner struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev, 2813b411b363SPhilipp Reisner const char *alg, const char *name) 2814b411b363SPhilipp Reisner { 2815b411b363SPhilipp Reisner struct crypto_hash *tfm; 2816b411b363SPhilipp Reisner 2817b411b363SPhilipp Reisner if (!alg[0]) 2818b411b363SPhilipp Reisner return NULL; 2819b411b363SPhilipp Reisner 2820b411b363SPhilipp Reisner tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC); 2821b411b363SPhilipp Reisner if (IS_ERR(tfm)) { 2822b411b363SPhilipp Reisner dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n", 2823b411b363SPhilipp Reisner alg, name, PTR_ERR(tfm)); 2824b411b363SPhilipp Reisner return tfm; 2825b411b363SPhilipp Reisner } 2826b411b363SPhilipp Reisner if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) { 2827b411b363SPhilipp Reisner crypto_free_hash(tfm); 2828b411b363SPhilipp Reisner dev_err(DEV, "\"%s\" is not a digest (%s)\n", alg, name); 2829b411b363SPhilipp Reisner return ERR_PTR(-EINVAL); 2830b411b363SPhilipp Reisner } 2831b411b363SPhilipp Reisner return tfm; 2832b411b363SPhilipp Reisner } 2833b411b363SPhilipp Reisner 2834d8763023SAndreas Gruenbacher static int receive_SyncParam(struct drbd_conf *mdev, enum drbd_packet cmd, 2835d8763023SAndreas Gruenbacher unsigned int packet_size) 2836b411b363SPhilipp Reisner { 283781e84650SAndreas Gruenbacher int ok = true; 2838e42325a5SPhilipp Reisner struct p_rs_param_95 *p = &mdev->tconn->data.rbuf.rs_param_95; 2839b411b363SPhilipp Reisner unsigned int header_size, data_size, exp_max_sz; 2840b411b363SPhilipp Reisner struct crypto_hash *verify_tfm = NULL; 2841b411b363SPhilipp Reisner struct crypto_hash *csums_tfm = NULL; 284231890f4aSPhilipp Reisner const int apv = mdev->tconn->agreed_pro_version; 2843778f271dSPhilipp Reisner int *rs_plan_s = NULL; 2844778f271dSPhilipp Reisner int fifo_size = 0; 2845b411b363SPhilipp Reisner 2846b411b363SPhilipp Reisner exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) 2847b411b363SPhilipp Reisner : apv == 88 ? sizeof(struct p_rs_param) 2848b411b363SPhilipp Reisner + SHARED_SECRET_MAX 28498e26f9ccSPhilipp Reisner : apv <= 94 ? sizeof(struct p_rs_param_89) 28508e26f9ccSPhilipp Reisner : /* apv >= 95 */ sizeof(struct p_rs_param_95); 2851b411b363SPhilipp Reisner 285202918be2SPhilipp Reisner if (packet_size > exp_max_sz) { 2853b411b363SPhilipp Reisner dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n", 285402918be2SPhilipp Reisner packet_size, exp_max_sz); 285581e84650SAndreas Gruenbacher return false; 2856b411b363SPhilipp Reisner } 2857b411b363SPhilipp Reisner 2858b411b363SPhilipp Reisner if (apv <= 88) { 2859257d0af6SPhilipp Reisner header_size = sizeof(struct p_rs_param) - sizeof(struct p_header); 286002918be2SPhilipp Reisner data_size = packet_size - header_size; 28618e26f9ccSPhilipp Reisner } else if (apv <= 94) { 2862257d0af6SPhilipp Reisner header_size = sizeof(struct p_rs_param_89) - sizeof(struct p_header); 286302918be2SPhilipp Reisner data_size = packet_size - header_size; 2864b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 28658e26f9ccSPhilipp Reisner } else { 2866257d0af6SPhilipp Reisner header_size = sizeof(struct p_rs_param_95) - sizeof(struct p_header); 286702918be2SPhilipp Reisner data_size = packet_size - header_size; 2868b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 2869b411b363SPhilipp Reisner } 2870b411b363SPhilipp Reisner 2871b411b363SPhilipp Reisner /* initialize verify_alg and csums_alg */ 2872b411b363SPhilipp Reisner memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); 2873b411b363SPhilipp Reisner 287402918be2SPhilipp Reisner if (drbd_recv(mdev, &p->head.payload, header_size) != header_size) 287581e84650SAndreas Gruenbacher return false; 2876b411b363SPhilipp Reisner 2877b411b363SPhilipp Reisner mdev->sync_conf.rate = be32_to_cpu(p->rate); 2878b411b363SPhilipp Reisner 2879b411b363SPhilipp Reisner if (apv >= 88) { 2880b411b363SPhilipp Reisner if (apv == 88) { 2881b411b363SPhilipp Reisner if (data_size > SHARED_SECRET_MAX) { 2882b411b363SPhilipp Reisner dev_err(DEV, "verify-alg too long, " 2883b411b363SPhilipp Reisner "peer wants %u, accepting only %u byte\n", 2884b411b363SPhilipp Reisner data_size, SHARED_SECRET_MAX); 288581e84650SAndreas Gruenbacher return false; 2886b411b363SPhilipp Reisner } 2887b411b363SPhilipp Reisner 2888b411b363SPhilipp Reisner if (drbd_recv(mdev, p->verify_alg, data_size) != data_size) 288981e84650SAndreas Gruenbacher return false; 2890b411b363SPhilipp Reisner 2891b411b363SPhilipp Reisner /* we expect NUL terminated string */ 2892b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 2893b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[data_size-1] == 0); 2894b411b363SPhilipp Reisner p->verify_alg[data_size-1] = 0; 2895b411b363SPhilipp Reisner 2896b411b363SPhilipp Reisner } else /* apv >= 89 */ { 2897b411b363SPhilipp Reisner /* we still expect NUL terminated strings */ 2898b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 2899b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0); 2900b411b363SPhilipp Reisner D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0); 2901b411b363SPhilipp Reisner p->verify_alg[SHARED_SECRET_MAX-1] = 0; 2902b411b363SPhilipp Reisner p->csums_alg[SHARED_SECRET_MAX-1] = 0; 2903b411b363SPhilipp Reisner } 2904b411b363SPhilipp Reisner 2905b411b363SPhilipp Reisner if (strcmp(mdev->sync_conf.verify_alg, p->verify_alg)) { 2906b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 2907b411b363SPhilipp Reisner dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", 2908b411b363SPhilipp Reisner mdev->sync_conf.verify_alg, p->verify_alg); 2909b411b363SPhilipp Reisner goto disconnect; 2910b411b363SPhilipp Reisner } 2911b411b363SPhilipp Reisner verify_tfm = drbd_crypto_alloc_digest_safe(mdev, 2912b411b363SPhilipp Reisner p->verify_alg, "verify-alg"); 2913b411b363SPhilipp Reisner if (IS_ERR(verify_tfm)) { 2914b411b363SPhilipp Reisner verify_tfm = NULL; 2915b411b363SPhilipp Reisner goto disconnect; 2916b411b363SPhilipp Reisner } 2917b411b363SPhilipp Reisner } 2918b411b363SPhilipp Reisner 2919b411b363SPhilipp Reisner if (apv >= 89 && strcmp(mdev->sync_conf.csums_alg, p->csums_alg)) { 2920b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 2921b411b363SPhilipp Reisner dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", 2922b411b363SPhilipp Reisner mdev->sync_conf.csums_alg, p->csums_alg); 2923b411b363SPhilipp Reisner goto disconnect; 2924b411b363SPhilipp Reisner } 2925b411b363SPhilipp Reisner csums_tfm = drbd_crypto_alloc_digest_safe(mdev, 2926b411b363SPhilipp Reisner p->csums_alg, "csums-alg"); 2927b411b363SPhilipp Reisner if (IS_ERR(csums_tfm)) { 2928b411b363SPhilipp Reisner csums_tfm = NULL; 2929b411b363SPhilipp Reisner goto disconnect; 2930b411b363SPhilipp Reisner } 2931b411b363SPhilipp Reisner } 2932b411b363SPhilipp Reisner 29338e26f9ccSPhilipp Reisner if (apv > 94) { 29348e26f9ccSPhilipp Reisner mdev->sync_conf.rate = be32_to_cpu(p->rate); 29358e26f9ccSPhilipp Reisner mdev->sync_conf.c_plan_ahead = be32_to_cpu(p->c_plan_ahead); 29368e26f9ccSPhilipp Reisner mdev->sync_conf.c_delay_target = be32_to_cpu(p->c_delay_target); 29378e26f9ccSPhilipp Reisner mdev->sync_conf.c_fill_target = be32_to_cpu(p->c_fill_target); 29388e26f9ccSPhilipp Reisner mdev->sync_conf.c_max_rate = be32_to_cpu(p->c_max_rate); 2939778f271dSPhilipp Reisner 2940778f271dSPhilipp Reisner fifo_size = (mdev->sync_conf.c_plan_ahead * 10 * SLEEP_TIME) / HZ; 2941778f271dSPhilipp Reisner if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) { 2942778f271dSPhilipp Reisner rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL); 2943778f271dSPhilipp Reisner if (!rs_plan_s) { 2944778f271dSPhilipp Reisner dev_err(DEV, "kmalloc of fifo_buffer failed"); 2945778f271dSPhilipp Reisner goto disconnect; 2946778f271dSPhilipp Reisner } 2947778f271dSPhilipp Reisner } 29488e26f9ccSPhilipp Reisner } 2949b411b363SPhilipp Reisner 2950b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 2951b411b363SPhilipp Reisner /* lock against drbd_nl_syncer_conf() */ 2952b411b363SPhilipp Reisner if (verify_tfm) { 2953b411b363SPhilipp Reisner strcpy(mdev->sync_conf.verify_alg, p->verify_alg); 2954b411b363SPhilipp Reisner mdev->sync_conf.verify_alg_len = strlen(p->verify_alg) + 1; 2955b411b363SPhilipp Reisner crypto_free_hash(mdev->verify_tfm); 2956b411b363SPhilipp Reisner mdev->verify_tfm = verify_tfm; 2957b411b363SPhilipp Reisner dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg); 2958b411b363SPhilipp Reisner } 2959b411b363SPhilipp Reisner if (csums_tfm) { 2960b411b363SPhilipp Reisner strcpy(mdev->sync_conf.csums_alg, p->csums_alg); 2961b411b363SPhilipp Reisner mdev->sync_conf.csums_alg_len = strlen(p->csums_alg) + 1; 2962b411b363SPhilipp Reisner crypto_free_hash(mdev->csums_tfm); 2963b411b363SPhilipp Reisner mdev->csums_tfm = csums_tfm; 2964b411b363SPhilipp Reisner dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg); 2965b411b363SPhilipp Reisner } 2966778f271dSPhilipp Reisner if (fifo_size != mdev->rs_plan_s.size) { 2967778f271dSPhilipp Reisner kfree(mdev->rs_plan_s.values); 2968778f271dSPhilipp Reisner mdev->rs_plan_s.values = rs_plan_s; 2969778f271dSPhilipp Reisner mdev->rs_plan_s.size = fifo_size; 2970778f271dSPhilipp Reisner mdev->rs_planed = 0; 2971778f271dSPhilipp Reisner } 2972b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 2973b411b363SPhilipp Reisner } 2974b411b363SPhilipp Reisner 2975b411b363SPhilipp Reisner return ok; 2976b411b363SPhilipp Reisner disconnect: 2977b411b363SPhilipp Reisner /* just for completeness: actually not needed, 2978b411b363SPhilipp Reisner * as this is not reached if csums_tfm was ok. */ 2979b411b363SPhilipp Reisner crypto_free_hash(csums_tfm); 2980b411b363SPhilipp Reisner /* but free the verify_tfm again, if csums_tfm did not work out */ 2981b411b363SPhilipp Reisner crypto_free_hash(verify_tfm); 2982b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 298381e84650SAndreas Gruenbacher return false; 2984b411b363SPhilipp Reisner } 2985b411b363SPhilipp Reisner 2986b411b363SPhilipp Reisner /* warn if the arguments differ by more than 12.5% */ 2987b411b363SPhilipp Reisner static void warn_if_differ_considerably(struct drbd_conf *mdev, 2988b411b363SPhilipp Reisner const char *s, sector_t a, sector_t b) 2989b411b363SPhilipp Reisner { 2990b411b363SPhilipp Reisner sector_t d; 2991b411b363SPhilipp Reisner if (a == 0 || b == 0) 2992b411b363SPhilipp Reisner return; 2993b411b363SPhilipp Reisner d = (a > b) ? (a - b) : (b - a); 2994b411b363SPhilipp Reisner if (d > (a>>3) || d > (b>>3)) 2995b411b363SPhilipp Reisner dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s, 2996b411b363SPhilipp Reisner (unsigned long long)a, (unsigned long long)b); 2997b411b363SPhilipp Reisner } 2998b411b363SPhilipp Reisner 2999d8763023SAndreas Gruenbacher static int receive_sizes(struct drbd_conf *mdev, enum drbd_packet cmd, 3000d8763023SAndreas Gruenbacher unsigned int data_size) 3001b411b363SPhilipp Reisner { 3002e42325a5SPhilipp Reisner struct p_sizes *p = &mdev->tconn->data.rbuf.sizes; 3003b411b363SPhilipp Reisner enum determine_dev_size dd = unchanged; 3004b411b363SPhilipp Reisner sector_t p_size, p_usize, my_usize; 3005b411b363SPhilipp Reisner int ldsc = 0; /* local disk size changed */ 3006e89b591cSPhilipp Reisner enum dds_flags ddsf; 3007b411b363SPhilipp Reisner 3008b411b363SPhilipp Reisner p_size = be64_to_cpu(p->d_size); 3009b411b363SPhilipp Reisner p_usize = be64_to_cpu(p->u_size); 3010b411b363SPhilipp Reisner 3011b411b363SPhilipp Reisner if (p_size == 0 && mdev->state.disk == D_DISKLESS) { 3012b411b363SPhilipp Reisner dev_err(DEV, "some backing storage is needed\n"); 3013b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 301481e84650SAndreas Gruenbacher return false; 3015b411b363SPhilipp Reisner } 3016b411b363SPhilipp Reisner 3017b411b363SPhilipp Reisner /* just store the peer's disk size for now. 3018b411b363SPhilipp Reisner * we still need to figure out whether we accept that. */ 3019b411b363SPhilipp Reisner mdev->p_size = p_size; 3020b411b363SPhilipp Reisner 3021b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3022b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "lower level device sizes", 3023b411b363SPhilipp Reisner p_size, drbd_get_max_capacity(mdev->ldev)); 3024b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "user requested size", 3025b411b363SPhilipp Reisner p_usize, mdev->ldev->dc.disk_size); 3026b411b363SPhilipp Reisner 3027b411b363SPhilipp Reisner /* if this is the first connect, or an otherwise expected 3028b411b363SPhilipp Reisner * param exchange, choose the minimum */ 3029b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) 3030b411b363SPhilipp Reisner p_usize = min_not_zero((sector_t)mdev->ldev->dc.disk_size, 3031b411b363SPhilipp Reisner p_usize); 3032b411b363SPhilipp Reisner 3033b411b363SPhilipp Reisner my_usize = mdev->ldev->dc.disk_size; 3034b411b363SPhilipp Reisner 3035b411b363SPhilipp Reisner if (mdev->ldev->dc.disk_size != p_usize) { 3036b411b363SPhilipp Reisner mdev->ldev->dc.disk_size = p_usize; 3037b411b363SPhilipp Reisner dev_info(DEV, "Peer sets u_size to %lu sectors\n", 3038b411b363SPhilipp Reisner (unsigned long)mdev->ldev->dc.disk_size); 3039b411b363SPhilipp Reisner } 3040b411b363SPhilipp Reisner 3041b411b363SPhilipp Reisner /* Never shrink a device with usable data during connect. 3042b411b363SPhilipp Reisner But allow online shrinking if we are connected. */ 3043a393db6fSPhilipp Reisner if (drbd_new_dev_size(mdev, mdev->ldev, 0) < 3044b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) && 3045b411b363SPhilipp Reisner mdev->state.disk >= D_OUTDATED && 3046b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED) { 3047b411b363SPhilipp Reisner dev_err(DEV, "The peer's disk size is too small!\n"); 3048b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 3049b411b363SPhilipp Reisner mdev->ldev->dc.disk_size = my_usize; 3050b411b363SPhilipp Reisner put_ldev(mdev); 305181e84650SAndreas Gruenbacher return false; 3052b411b363SPhilipp Reisner } 3053b411b363SPhilipp Reisner put_ldev(mdev); 3054b411b363SPhilipp Reisner } 3055b411b363SPhilipp Reisner 3056e89b591cSPhilipp Reisner ddsf = be16_to_cpu(p->dds_flags); 3057b411b363SPhilipp Reisner if (get_ldev(mdev)) { 305824c4830cSBart Van Assche dd = drbd_determine_dev_size(mdev, ddsf); 3059b411b363SPhilipp Reisner put_ldev(mdev); 3060b411b363SPhilipp Reisner if (dd == dev_size_error) 306181e84650SAndreas Gruenbacher return false; 3062b411b363SPhilipp Reisner drbd_md_sync(mdev); 3063b411b363SPhilipp Reisner } else { 3064b411b363SPhilipp Reisner /* I am diskless, need to accept the peer's size. */ 3065b411b363SPhilipp Reisner drbd_set_my_capacity(mdev, p_size); 3066b411b363SPhilipp Reisner } 3067b411b363SPhilipp Reisner 306899432fccSPhilipp Reisner mdev->peer_max_bio_size = be32_to_cpu(p->max_bio_size); 306999432fccSPhilipp Reisner drbd_reconsider_max_bio_size(mdev); 307099432fccSPhilipp Reisner 3071b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3072b411b363SPhilipp Reisner if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { 3073b411b363SPhilipp Reisner mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); 3074b411b363SPhilipp Reisner ldsc = 1; 3075b411b363SPhilipp Reisner } 3076b411b363SPhilipp Reisner 3077b411b363SPhilipp Reisner put_ldev(mdev); 3078b411b363SPhilipp Reisner } 3079b411b363SPhilipp Reisner 3080b411b363SPhilipp Reisner if (mdev->state.conn > C_WF_REPORT_PARAMS) { 3081b411b363SPhilipp Reisner if (be64_to_cpu(p->c_size) != 3082b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) || ldsc) { 3083b411b363SPhilipp Reisner /* we have different sizes, probably peer 3084b411b363SPhilipp Reisner * needs to know my new size... */ 3085e89b591cSPhilipp Reisner drbd_send_sizes(mdev, 0, ddsf); 3086b411b363SPhilipp Reisner } 3087b411b363SPhilipp Reisner if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) || 3088b411b363SPhilipp Reisner (dd == grew && mdev->state.conn == C_CONNECTED)) { 3089b411b363SPhilipp Reisner if (mdev->state.pdsk >= D_INCONSISTENT && 3090e89b591cSPhilipp Reisner mdev->state.disk >= D_INCONSISTENT) { 3091e89b591cSPhilipp Reisner if (ddsf & DDSF_NO_RESYNC) 3092e89b591cSPhilipp Reisner dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n"); 3093b411b363SPhilipp Reisner else 3094e89b591cSPhilipp Reisner resync_after_online_grow(mdev); 3095e89b591cSPhilipp Reisner } else 3096b411b363SPhilipp Reisner set_bit(RESYNC_AFTER_NEG, &mdev->flags); 3097b411b363SPhilipp Reisner } 3098b411b363SPhilipp Reisner } 3099b411b363SPhilipp Reisner 310081e84650SAndreas Gruenbacher return true; 3101b411b363SPhilipp Reisner } 3102b411b363SPhilipp Reisner 3103d8763023SAndreas Gruenbacher static int receive_uuids(struct drbd_conf *mdev, enum drbd_packet cmd, 3104d8763023SAndreas Gruenbacher unsigned int data_size) 3105b411b363SPhilipp Reisner { 3106e42325a5SPhilipp Reisner struct p_uuids *p = &mdev->tconn->data.rbuf.uuids; 3107b411b363SPhilipp Reisner u64 *p_uuid; 310862b0da3aSLars Ellenberg int i, updated_uuids = 0; 3109b411b363SPhilipp Reisner 3110b411b363SPhilipp Reisner p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); 3111b411b363SPhilipp Reisner 3112b411b363SPhilipp Reisner for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) 3113b411b363SPhilipp Reisner p_uuid[i] = be64_to_cpu(p->uuid[i]); 3114b411b363SPhilipp Reisner 3115b411b363SPhilipp Reisner kfree(mdev->p_uuid); 3116b411b363SPhilipp Reisner mdev->p_uuid = p_uuid; 3117b411b363SPhilipp Reisner 3118b411b363SPhilipp Reisner if (mdev->state.conn < C_CONNECTED && 3119b411b363SPhilipp Reisner mdev->state.disk < D_INCONSISTENT && 3120b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && 3121b411b363SPhilipp Reisner (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { 3122b411b363SPhilipp Reisner dev_err(DEV, "Can only connect to data with current UUID=%016llX\n", 3123b411b363SPhilipp Reisner (unsigned long long)mdev->ed_uuid); 3124b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 312581e84650SAndreas Gruenbacher return false; 3126b411b363SPhilipp Reisner } 3127b411b363SPhilipp Reisner 3128b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3129b411b363SPhilipp Reisner int skip_initial_sync = 3130b411b363SPhilipp Reisner mdev->state.conn == C_CONNECTED && 313131890f4aSPhilipp Reisner mdev->tconn->agreed_pro_version >= 90 && 3132b411b363SPhilipp Reisner mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && 3133b411b363SPhilipp Reisner (p_uuid[UI_FLAGS] & 8); 3134b411b363SPhilipp Reisner if (skip_initial_sync) { 3135b411b363SPhilipp Reisner dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n"); 3136b411b363SPhilipp Reisner drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, 313720ceb2b2SLars Ellenberg "clear_n_write from receive_uuids", 313820ceb2b2SLars Ellenberg BM_LOCKED_TEST_ALLOWED); 3139b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]); 3140b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0); 3141b411b363SPhilipp Reisner _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), 3142b411b363SPhilipp Reisner CS_VERBOSE, NULL); 3143b411b363SPhilipp Reisner drbd_md_sync(mdev); 314462b0da3aSLars Ellenberg updated_uuids = 1; 3145b411b363SPhilipp Reisner } 3146b411b363SPhilipp Reisner put_ldev(mdev); 314718a50fa2SPhilipp Reisner } else if (mdev->state.disk < D_INCONSISTENT && 314818a50fa2SPhilipp Reisner mdev->state.role == R_PRIMARY) { 314918a50fa2SPhilipp Reisner /* I am a diskless primary, the peer just created a new current UUID 315018a50fa2SPhilipp Reisner for me. */ 315162b0da3aSLars Ellenberg updated_uuids = drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 3152b411b363SPhilipp Reisner } 3153b411b363SPhilipp Reisner 3154b411b363SPhilipp Reisner /* Before we test for the disk state, we should wait until an eventually 3155b411b363SPhilipp Reisner ongoing cluster wide state change is finished. That is important if 3156b411b363SPhilipp Reisner we are primary and are detaching from our disk. We need to see the 3157b411b363SPhilipp Reisner new disk state... */ 3158b411b363SPhilipp Reisner wait_event(mdev->misc_wait, !test_bit(CLUSTER_ST_CHANGE, &mdev->flags)); 3159b411b363SPhilipp Reisner if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT) 316062b0da3aSLars Ellenberg updated_uuids |= drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 316162b0da3aSLars Ellenberg 316262b0da3aSLars Ellenberg if (updated_uuids) 316362b0da3aSLars Ellenberg drbd_print_uuids(mdev, "receiver updated UUIDs to"); 3164b411b363SPhilipp Reisner 316581e84650SAndreas Gruenbacher return true; 3166b411b363SPhilipp Reisner } 3167b411b363SPhilipp Reisner 3168b411b363SPhilipp Reisner /** 3169b411b363SPhilipp Reisner * convert_state() - Converts the peer's view of the cluster state to our point of view 3170b411b363SPhilipp Reisner * @ps: The state as seen by the peer. 3171b411b363SPhilipp Reisner */ 3172b411b363SPhilipp Reisner static union drbd_state convert_state(union drbd_state ps) 3173b411b363SPhilipp Reisner { 3174b411b363SPhilipp Reisner union drbd_state ms; 3175b411b363SPhilipp Reisner 3176b411b363SPhilipp Reisner static enum drbd_conns c_tab[] = { 3177b411b363SPhilipp Reisner [C_CONNECTED] = C_CONNECTED, 3178b411b363SPhilipp Reisner 3179b411b363SPhilipp Reisner [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, 3180b411b363SPhilipp Reisner [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, 3181b411b363SPhilipp Reisner [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ 3182b411b363SPhilipp Reisner [C_VERIFY_S] = C_VERIFY_T, 3183b411b363SPhilipp Reisner [C_MASK] = C_MASK, 3184b411b363SPhilipp Reisner }; 3185b411b363SPhilipp Reisner 3186b411b363SPhilipp Reisner ms.i = ps.i; 3187b411b363SPhilipp Reisner 3188b411b363SPhilipp Reisner ms.conn = c_tab[ps.conn]; 3189b411b363SPhilipp Reisner ms.peer = ps.role; 3190b411b363SPhilipp Reisner ms.role = ps.peer; 3191b411b363SPhilipp Reisner ms.pdsk = ps.disk; 3192b411b363SPhilipp Reisner ms.disk = ps.pdsk; 3193b411b363SPhilipp Reisner ms.peer_isp = (ps.aftr_isp | ps.user_isp); 3194b411b363SPhilipp Reisner 3195b411b363SPhilipp Reisner return ms; 3196b411b363SPhilipp Reisner } 3197b411b363SPhilipp Reisner 3198d8763023SAndreas Gruenbacher static int receive_req_state(struct drbd_conf *mdev, enum drbd_packet cmd, 3199d8763023SAndreas Gruenbacher unsigned int data_size) 3200b411b363SPhilipp Reisner { 3201e42325a5SPhilipp Reisner struct p_req_state *p = &mdev->tconn->data.rbuf.req_state; 3202b411b363SPhilipp Reisner union drbd_state mask, val; 3203bf885f8aSAndreas Gruenbacher enum drbd_state_rv rv; 3204b411b363SPhilipp Reisner 3205b411b363SPhilipp Reisner mask.i = be32_to_cpu(p->mask); 3206b411b363SPhilipp Reisner val.i = be32_to_cpu(p->val); 3207b411b363SPhilipp Reisner 320825703f83SPhilipp Reisner if (test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) && 3209b411b363SPhilipp Reisner test_bit(CLUSTER_ST_CHANGE, &mdev->flags)) { 3210b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG); 321181e84650SAndreas Gruenbacher return true; 3212b411b363SPhilipp Reisner } 3213b411b363SPhilipp Reisner 3214b411b363SPhilipp Reisner mask = convert_state(mask); 3215b411b363SPhilipp Reisner val = convert_state(val); 3216b411b363SPhilipp Reisner 3217b411b363SPhilipp Reisner rv = drbd_change_state(mdev, CS_VERBOSE, mask, val); 3218b411b363SPhilipp Reisner 3219b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, rv); 3220b411b363SPhilipp Reisner drbd_md_sync(mdev); 3221b411b363SPhilipp Reisner 322281e84650SAndreas Gruenbacher return true; 3223b411b363SPhilipp Reisner } 3224b411b363SPhilipp Reisner 3225d8763023SAndreas Gruenbacher static int receive_state(struct drbd_conf *mdev, enum drbd_packet cmd, 3226d8763023SAndreas Gruenbacher unsigned int data_size) 3227b411b363SPhilipp Reisner { 3228e42325a5SPhilipp Reisner struct p_state *p = &mdev->tconn->data.rbuf.state; 32294ac4aadaSLars Ellenberg union drbd_state os, ns, peer_state; 3230b411b363SPhilipp Reisner enum drbd_disk_state real_peer_disk; 323165d922c3SPhilipp Reisner enum chg_state_flags cs_flags; 3232b411b363SPhilipp Reisner int rv; 3233b411b363SPhilipp Reisner 3234b411b363SPhilipp Reisner peer_state.i = be32_to_cpu(p->state); 3235b411b363SPhilipp Reisner 3236b411b363SPhilipp Reisner real_peer_disk = peer_state.disk; 3237b411b363SPhilipp Reisner if (peer_state.disk == D_NEGOTIATING) { 3238b411b363SPhilipp Reisner real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; 3239b411b363SPhilipp Reisner dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); 3240b411b363SPhilipp Reisner } 3241b411b363SPhilipp Reisner 324287eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 3243b411b363SPhilipp Reisner retry: 32444ac4aadaSLars Ellenberg os = ns = mdev->state; 324587eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3246b411b363SPhilipp Reisner 3247e9ef7bb6SLars Ellenberg /* peer says his disk is uptodate, while we think it is inconsistent, 3248e9ef7bb6SLars Ellenberg * and this happens while we think we have a sync going on. */ 3249e9ef7bb6SLars Ellenberg if (os.pdsk == D_INCONSISTENT && real_peer_disk == D_UP_TO_DATE && 3250e9ef7bb6SLars Ellenberg os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { 3251e9ef7bb6SLars Ellenberg /* If we are (becoming) SyncSource, but peer is still in sync 3252e9ef7bb6SLars Ellenberg * preparation, ignore its uptodate-ness to avoid flapping, it 3253e9ef7bb6SLars Ellenberg * will change to inconsistent once the peer reaches active 3254e9ef7bb6SLars Ellenberg * syncing states. 3255e9ef7bb6SLars Ellenberg * It may have changed syncer-paused flags, however, so we 3256e9ef7bb6SLars Ellenberg * cannot ignore this completely. */ 3257e9ef7bb6SLars Ellenberg if (peer_state.conn > C_CONNECTED && 3258e9ef7bb6SLars Ellenberg peer_state.conn < C_SYNC_SOURCE) 3259e9ef7bb6SLars Ellenberg real_peer_disk = D_INCONSISTENT; 3260e9ef7bb6SLars Ellenberg 3261e9ef7bb6SLars Ellenberg /* if peer_state changes to connected at the same time, 3262e9ef7bb6SLars Ellenberg * it explicitly notifies us that it finished resync. 3263e9ef7bb6SLars Ellenberg * Maybe we should finish it up, too? */ 3264e9ef7bb6SLars Ellenberg else if (os.conn >= C_SYNC_SOURCE && 3265e9ef7bb6SLars Ellenberg peer_state.conn == C_CONNECTED) { 3266e9ef7bb6SLars Ellenberg if (drbd_bm_total_weight(mdev) <= mdev->rs_failed) 3267e9ef7bb6SLars Ellenberg drbd_resync_finished(mdev); 326881e84650SAndreas Gruenbacher return true; 3269e9ef7bb6SLars Ellenberg } 3270e9ef7bb6SLars Ellenberg } 3271e9ef7bb6SLars Ellenberg 3272e9ef7bb6SLars Ellenberg /* peer says his disk is inconsistent, while we think it is uptodate, 3273e9ef7bb6SLars Ellenberg * and this happens while the peer still thinks we have a sync going on, 3274e9ef7bb6SLars Ellenberg * but we think we are already done with the sync. 3275e9ef7bb6SLars Ellenberg * We ignore this to avoid flapping pdsk. 3276e9ef7bb6SLars Ellenberg * This should not happen, if the peer is a recent version of drbd. */ 3277e9ef7bb6SLars Ellenberg if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && 3278e9ef7bb6SLars Ellenberg os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) 3279e9ef7bb6SLars Ellenberg real_peer_disk = D_UP_TO_DATE; 3280e9ef7bb6SLars Ellenberg 32814ac4aadaSLars Ellenberg if (ns.conn == C_WF_REPORT_PARAMS) 32824ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3283b411b363SPhilipp Reisner 328467531718SPhilipp Reisner if (peer_state.conn == C_AHEAD) 328567531718SPhilipp Reisner ns.conn = C_BEHIND; 328667531718SPhilipp Reisner 3287b411b363SPhilipp Reisner if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING && 3288b411b363SPhilipp Reisner get_ldev_if_state(mdev, D_NEGOTIATING)) { 3289b411b363SPhilipp Reisner int cr; /* consider resync */ 3290b411b363SPhilipp Reisner 3291b411b363SPhilipp Reisner /* if we established a new connection */ 32924ac4aadaSLars Ellenberg cr = (os.conn < C_CONNECTED); 3293b411b363SPhilipp Reisner /* if we had an established connection 3294b411b363SPhilipp Reisner * and one of the nodes newly attaches a disk */ 32954ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3296b411b363SPhilipp Reisner (peer_state.disk == D_NEGOTIATING || 32974ac4aadaSLars Ellenberg os.disk == D_NEGOTIATING)); 3298b411b363SPhilipp Reisner /* if we have both been inconsistent, and the peer has been 3299b411b363SPhilipp Reisner * forced to be UpToDate with --overwrite-data */ 3300b411b363SPhilipp Reisner cr |= test_bit(CONSIDER_RESYNC, &mdev->flags); 3301b411b363SPhilipp Reisner /* if we had been plain connected, and the admin requested to 3302b411b363SPhilipp Reisner * start a sync by "invalidate" or "invalidate-remote" */ 33034ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3304b411b363SPhilipp Reisner (peer_state.conn >= C_STARTING_SYNC_S && 3305b411b363SPhilipp Reisner peer_state.conn <= C_WF_BITMAP_T)); 3306b411b363SPhilipp Reisner 3307b411b363SPhilipp Reisner if (cr) 33084ac4aadaSLars Ellenberg ns.conn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk); 3309b411b363SPhilipp Reisner 3310b411b363SPhilipp Reisner put_ldev(mdev); 33114ac4aadaSLars Ellenberg if (ns.conn == C_MASK) { 33124ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3313b411b363SPhilipp Reisner if (mdev->state.disk == D_NEGOTIATING) { 331482f59cc6SLars Ellenberg drbd_force_state(mdev, NS(disk, D_FAILED)); 3315b411b363SPhilipp Reisner } else if (peer_state.disk == D_NEGOTIATING) { 3316b411b363SPhilipp Reisner dev_err(DEV, "Disk attach process on the peer node was aborted.\n"); 3317b411b363SPhilipp Reisner peer_state.disk = D_DISKLESS; 3318580b9767SLars Ellenberg real_peer_disk = D_DISKLESS; 3319b411b363SPhilipp Reisner } else { 3320cf14c2e9SPhilipp Reisner if (test_and_clear_bit(CONN_DRY_RUN, &mdev->flags)) 332181e84650SAndreas Gruenbacher return false; 33224ac4aadaSLars Ellenberg D_ASSERT(os.conn == C_WF_REPORT_PARAMS); 3323b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 332481e84650SAndreas Gruenbacher return false; 3325b411b363SPhilipp Reisner } 3326b411b363SPhilipp Reisner } 3327b411b363SPhilipp Reisner } 3328b411b363SPhilipp Reisner 332987eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 33304ac4aadaSLars Ellenberg if (mdev->state.i != os.i) 3331b411b363SPhilipp Reisner goto retry; 3332b411b363SPhilipp Reisner clear_bit(CONSIDER_RESYNC, &mdev->flags); 3333b411b363SPhilipp Reisner ns.peer = peer_state.role; 3334b411b363SPhilipp Reisner ns.pdsk = real_peer_disk; 3335b411b363SPhilipp Reisner ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); 33364ac4aadaSLars Ellenberg if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) 3337b411b363SPhilipp Reisner ns.disk = mdev->new_state_tmp.disk; 33384ac4aadaSLars Ellenberg cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); 33394ac4aadaSLars Ellenberg if (ns.pdsk == D_CONSISTENT && is_susp(ns) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && 3340481c6f50SPhilipp Reisner test_bit(NEW_CUR_UUID, &mdev->flags)) { 33418554df1cSAndreas Gruenbacher /* Do not allow tl_restart(RESEND) for a rebooted peer. We can only allow this 3342481c6f50SPhilipp Reisner for temporal network outages! */ 334387eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3344481c6f50SPhilipp Reisner dev_err(DEV, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); 3345481c6f50SPhilipp Reisner tl_clear(mdev); 3346481c6f50SPhilipp Reisner drbd_uuid_new_current(mdev); 3347481c6f50SPhilipp Reisner clear_bit(NEW_CUR_UUID, &mdev->flags); 3348481c6f50SPhilipp Reisner drbd_force_state(mdev, NS2(conn, C_PROTOCOL_ERROR, susp, 0)); 334981e84650SAndreas Gruenbacher return false; 3350481c6f50SPhilipp Reisner } 335165d922c3SPhilipp Reisner rv = _drbd_set_state(mdev, ns, cs_flags, NULL); 3352b411b363SPhilipp Reisner ns = mdev->state; 335387eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3354b411b363SPhilipp Reisner 3355b411b363SPhilipp Reisner if (rv < SS_SUCCESS) { 3356b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 335781e84650SAndreas Gruenbacher return false; 3358b411b363SPhilipp Reisner } 3359b411b363SPhilipp Reisner 33604ac4aadaSLars Ellenberg if (os.conn > C_WF_REPORT_PARAMS) { 33614ac4aadaSLars Ellenberg if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED && 3362b411b363SPhilipp Reisner peer_state.disk != D_NEGOTIATING ) { 3363b411b363SPhilipp Reisner /* we want resync, peer has not yet decided to sync... */ 3364b411b363SPhilipp Reisner /* Nowadays only used when forcing a node into primary role and 3365b411b363SPhilipp Reisner setting its disk to UpToDate with that */ 3366b411b363SPhilipp Reisner drbd_send_uuids(mdev); 3367b411b363SPhilipp Reisner drbd_send_state(mdev); 3368b411b363SPhilipp Reisner } 3369b411b363SPhilipp Reisner } 3370b411b363SPhilipp Reisner 337189e58e75SPhilipp Reisner mdev->tconn->net_conf->want_lose = 0; 3372b411b363SPhilipp Reisner 3373b411b363SPhilipp Reisner drbd_md_sync(mdev); /* update connected indicator, la_size, ... */ 3374b411b363SPhilipp Reisner 337581e84650SAndreas Gruenbacher return true; 3376b411b363SPhilipp Reisner } 3377b411b363SPhilipp Reisner 3378d8763023SAndreas Gruenbacher static int receive_sync_uuid(struct drbd_conf *mdev, enum drbd_packet cmd, 3379d8763023SAndreas Gruenbacher unsigned int data_size) 3380b411b363SPhilipp Reisner { 3381e42325a5SPhilipp Reisner struct p_rs_uuid *p = &mdev->tconn->data.rbuf.rs_uuid; 3382b411b363SPhilipp Reisner 3383b411b363SPhilipp Reisner wait_event(mdev->misc_wait, 3384b411b363SPhilipp Reisner mdev->state.conn == C_WF_SYNC_UUID || 3385c4752ef1SPhilipp Reisner mdev->state.conn == C_BEHIND || 3386b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED || 3387b411b363SPhilipp Reisner mdev->state.disk < D_NEGOTIATING); 3388b411b363SPhilipp Reisner 3389b411b363SPhilipp Reisner /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */ 3390b411b363SPhilipp Reisner 3391b411b363SPhilipp Reisner /* Here the _drbd_uuid_ functions are right, current should 3392b411b363SPhilipp Reisner _not_ be rotated into the history */ 3393b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_NEGOTIATING)) { 3394b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid)); 3395b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0UL); 3396b411b363SPhilipp Reisner 339762b0da3aSLars Ellenberg drbd_print_uuids(mdev, "updated sync uuid"); 3398b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_TARGET); 3399b411b363SPhilipp Reisner 3400b411b363SPhilipp Reisner put_ldev(mdev); 3401b411b363SPhilipp Reisner } else 3402b411b363SPhilipp Reisner dev_err(DEV, "Ignoring SyncUUID packet!\n"); 3403b411b363SPhilipp Reisner 340481e84650SAndreas Gruenbacher return true; 3405b411b363SPhilipp Reisner } 3406b411b363SPhilipp Reisner 34072c46407dSAndreas Gruenbacher /** 34082c46407dSAndreas Gruenbacher * receive_bitmap_plain 34092c46407dSAndreas Gruenbacher * 34102c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 34112c46407dSAndreas Gruenbacher * code upon failure. 34122c46407dSAndreas Gruenbacher */ 34132c46407dSAndreas Gruenbacher static int 341402918be2SPhilipp Reisner receive_bitmap_plain(struct drbd_conf *mdev, unsigned int data_size, 3415b411b363SPhilipp Reisner unsigned long *buffer, struct bm_xfer_ctx *c) 3416b411b363SPhilipp Reisner { 3417b411b363SPhilipp Reisner unsigned num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset); 3418b411b363SPhilipp Reisner unsigned want = num_words * sizeof(long); 34192c46407dSAndreas Gruenbacher int err; 3420b411b363SPhilipp Reisner 342102918be2SPhilipp Reisner if (want != data_size) { 342202918be2SPhilipp Reisner dev_err(DEV, "%s:want (%u) != data_size (%u)\n", __func__, want, data_size); 34232c46407dSAndreas Gruenbacher return -EIO; 3424b411b363SPhilipp Reisner } 3425b411b363SPhilipp Reisner if (want == 0) 34262c46407dSAndreas Gruenbacher return 0; 34272c46407dSAndreas Gruenbacher err = drbd_recv(mdev, buffer, want); 34282c46407dSAndreas Gruenbacher if (err != want) { 34292c46407dSAndreas Gruenbacher if (err >= 0) 34302c46407dSAndreas Gruenbacher err = -EIO; 34312c46407dSAndreas Gruenbacher return err; 34322c46407dSAndreas Gruenbacher } 3433b411b363SPhilipp Reisner 3434b411b363SPhilipp Reisner drbd_bm_merge_lel(mdev, c->word_offset, num_words, buffer); 3435b411b363SPhilipp Reisner 3436b411b363SPhilipp Reisner c->word_offset += num_words; 3437b411b363SPhilipp Reisner c->bit_offset = c->word_offset * BITS_PER_LONG; 3438b411b363SPhilipp Reisner if (c->bit_offset > c->bm_bits) 3439b411b363SPhilipp Reisner c->bit_offset = c->bm_bits; 3440b411b363SPhilipp Reisner 34412c46407dSAndreas Gruenbacher return 1; 3442b411b363SPhilipp Reisner } 3443b411b363SPhilipp Reisner 34442c46407dSAndreas Gruenbacher /** 34452c46407dSAndreas Gruenbacher * recv_bm_rle_bits 34462c46407dSAndreas Gruenbacher * 34472c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 34482c46407dSAndreas Gruenbacher * code upon failure. 34492c46407dSAndreas Gruenbacher */ 34502c46407dSAndreas Gruenbacher static int 3451b411b363SPhilipp Reisner recv_bm_rle_bits(struct drbd_conf *mdev, 3452b411b363SPhilipp Reisner struct p_compressed_bm *p, 3453c6d25cfeSPhilipp Reisner struct bm_xfer_ctx *c, 3454c6d25cfeSPhilipp Reisner unsigned int len) 3455b411b363SPhilipp Reisner { 3456b411b363SPhilipp Reisner struct bitstream bs; 3457b411b363SPhilipp Reisner u64 look_ahead; 3458b411b363SPhilipp Reisner u64 rl; 3459b411b363SPhilipp Reisner u64 tmp; 3460b411b363SPhilipp Reisner unsigned long s = c->bit_offset; 3461b411b363SPhilipp Reisner unsigned long e; 3462b411b363SPhilipp Reisner int toggle = DCBP_get_start(p); 3463b411b363SPhilipp Reisner int have; 3464b411b363SPhilipp Reisner int bits; 3465b411b363SPhilipp Reisner 3466b411b363SPhilipp Reisner bitstream_init(&bs, p->code, len, DCBP_get_pad_bits(p)); 3467b411b363SPhilipp Reisner 3468b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &look_ahead, 64); 3469b411b363SPhilipp Reisner if (bits < 0) 34702c46407dSAndreas Gruenbacher return -EIO; 3471b411b363SPhilipp Reisner 3472b411b363SPhilipp Reisner for (have = bits; have > 0; s += rl, toggle = !toggle) { 3473b411b363SPhilipp Reisner bits = vli_decode_bits(&rl, look_ahead); 3474b411b363SPhilipp Reisner if (bits <= 0) 34752c46407dSAndreas Gruenbacher return -EIO; 3476b411b363SPhilipp Reisner 3477b411b363SPhilipp Reisner if (toggle) { 3478b411b363SPhilipp Reisner e = s + rl -1; 3479b411b363SPhilipp Reisner if (e >= c->bm_bits) { 3480b411b363SPhilipp Reisner dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); 34812c46407dSAndreas Gruenbacher return -EIO; 3482b411b363SPhilipp Reisner } 3483b411b363SPhilipp Reisner _drbd_bm_set_bits(mdev, s, e); 3484b411b363SPhilipp Reisner } 3485b411b363SPhilipp Reisner 3486b411b363SPhilipp Reisner if (have < bits) { 3487b411b363SPhilipp Reisner dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", 3488b411b363SPhilipp Reisner have, bits, look_ahead, 3489b411b363SPhilipp Reisner (unsigned int)(bs.cur.b - p->code), 3490b411b363SPhilipp Reisner (unsigned int)bs.buf_len); 34912c46407dSAndreas Gruenbacher return -EIO; 3492b411b363SPhilipp Reisner } 3493b411b363SPhilipp Reisner look_ahead >>= bits; 3494b411b363SPhilipp Reisner have -= bits; 3495b411b363SPhilipp Reisner 3496b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &tmp, 64 - have); 3497b411b363SPhilipp Reisner if (bits < 0) 34982c46407dSAndreas Gruenbacher return -EIO; 3499b411b363SPhilipp Reisner look_ahead |= tmp << have; 3500b411b363SPhilipp Reisner have += bits; 3501b411b363SPhilipp Reisner } 3502b411b363SPhilipp Reisner 3503b411b363SPhilipp Reisner c->bit_offset = s; 3504b411b363SPhilipp Reisner bm_xfer_ctx_bit_to_word_offset(c); 3505b411b363SPhilipp Reisner 35062c46407dSAndreas Gruenbacher return (s != c->bm_bits); 3507b411b363SPhilipp Reisner } 3508b411b363SPhilipp Reisner 35092c46407dSAndreas Gruenbacher /** 35102c46407dSAndreas Gruenbacher * decode_bitmap_c 35112c46407dSAndreas Gruenbacher * 35122c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 35132c46407dSAndreas Gruenbacher * code upon failure. 35142c46407dSAndreas Gruenbacher */ 35152c46407dSAndreas Gruenbacher static int 3516b411b363SPhilipp Reisner decode_bitmap_c(struct drbd_conf *mdev, 3517b411b363SPhilipp Reisner struct p_compressed_bm *p, 3518c6d25cfeSPhilipp Reisner struct bm_xfer_ctx *c, 3519c6d25cfeSPhilipp Reisner unsigned int len) 3520b411b363SPhilipp Reisner { 3521b411b363SPhilipp Reisner if (DCBP_get_code(p) == RLE_VLI_Bits) 3522c6d25cfeSPhilipp Reisner return recv_bm_rle_bits(mdev, p, c, len); 3523b411b363SPhilipp Reisner 3524b411b363SPhilipp Reisner /* other variants had been implemented for evaluation, 3525b411b363SPhilipp Reisner * but have been dropped as this one turned out to be "best" 3526b411b363SPhilipp Reisner * during all our tests. */ 3527b411b363SPhilipp Reisner 3528b411b363SPhilipp Reisner dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding); 3529b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); 35302c46407dSAndreas Gruenbacher return -EIO; 3531b411b363SPhilipp Reisner } 3532b411b363SPhilipp Reisner 3533b411b363SPhilipp Reisner void INFO_bm_xfer_stats(struct drbd_conf *mdev, 3534b411b363SPhilipp Reisner const char *direction, struct bm_xfer_ctx *c) 3535b411b363SPhilipp Reisner { 3536b411b363SPhilipp Reisner /* what would it take to transfer it "plaintext" */ 3537c012949aSPhilipp Reisner unsigned plain = sizeof(struct p_header) * 3538b411b363SPhilipp Reisner ((c->bm_words+BM_PACKET_WORDS-1)/BM_PACKET_WORDS+1) 3539b411b363SPhilipp Reisner + c->bm_words * sizeof(long); 3540b411b363SPhilipp Reisner unsigned total = c->bytes[0] + c->bytes[1]; 3541b411b363SPhilipp Reisner unsigned r; 3542b411b363SPhilipp Reisner 3543b411b363SPhilipp Reisner /* total can not be zero. but just in case: */ 3544b411b363SPhilipp Reisner if (total == 0) 3545b411b363SPhilipp Reisner return; 3546b411b363SPhilipp Reisner 3547b411b363SPhilipp Reisner /* don't report if not compressed */ 3548b411b363SPhilipp Reisner if (total >= plain) 3549b411b363SPhilipp Reisner return; 3550b411b363SPhilipp Reisner 3551b411b363SPhilipp Reisner /* total < plain. check for overflow, still */ 3552b411b363SPhilipp Reisner r = (total > UINT_MAX/1000) ? (total / (plain/1000)) 3553b411b363SPhilipp Reisner : (1000 * total / plain); 3554b411b363SPhilipp Reisner 3555b411b363SPhilipp Reisner if (r > 1000) 3556b411b363SPhilipp Reisner r = 1000; 3557b411b363SPhilipp Reisner 3558b411b363SPhilipp Reisner r = 1000 - r; 3559b411b363SPhilipp Reisner dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " 3560b411b363SPhilipp Reisner "total %u; compression: %u.%u%%\n", 3561b411b363SPhilipp Reisner direction, 3562b411b363SPhilipp Reisner c->bytes[1], c->packets[1], 3563b411b363SPhilipp Reisner c->bytes[0], c->packets[0], 3564b411b363SPhilipp Reisner total, r/10, r % 10); 3565b411b363SPhilipp Reisner } 3566b411b363SPhilipp Reisner 3567b411b363SPhilipp Reisner /* Since we are processing the bitfield from lower addresses to higher, 3568b411b363SPhilipp Reisner it does not matter if the process it in 32 bit chunks or 64 bit 3569b411b363SPhilipp Reisner chunks as long as it is little endian. (Understand it as byte stream, 3570b411b363SPhilipp Reisner beginning with the lowest byte...) If we would use big endian 3571b411b363SPhilipp Reisner we would need to process it from the highest address to the lowest, 3572b411b363SPhilipp Reisner in order to be agnostic to the 32 vs 64 bits issue. 3573b411b363SPhilipp Reisner 3574b411b363SPhilipp Reisner returns 0 on failure, 1 if we successfully received it. */ 3575d8763023SAndreas Gruenbacher static int receive_bitmap(struct drbd_conf *mdev, enum drbd_packet cmd, 3576d8763023SAndreas Gruenbacher unsigned int data_size) 3577b411b363SPhilipp Reisner { 3578b411b363SPhilipp Reisner struct bm_xfer_ctx c; 3579b411b363SPhilipp Reisner void *buffer; 35802c46407dSAndreas Gruenbacher int err; 358181e84650SAndreas Gruenbacher int ok = false; 3582257d0af6SPhilipp Reisner struct p_header *h = &mdev->tconn->data.rbuf.header; 3583b411b363SPhilipp Reisner 358420ceb2b2SLars Ellenberg drbd_bm_lock(mdev, "receive bitmap", BM_LOCKED_SET_ALLOWED); 358520ceb2b2SLars Ellenberg /* you are supposed to send additional out-of-sync information 358620ceb2b2SLars Ellenberg * if you actually set bits during this phase */ 3587b411b363SPhilipp Reisner 3588b411b363SPhilipp Reisner /* maybe we should use some per thread scratch page, 3589b411b363SPhilipp Reisner * and allocate that during initial device creation? */ 3590b411b363SPhilipp Reisner buffer = (unsigned long *) __get_free_page(GFP_NOIO); 3591b411b363SPhilipp Reisner if (!buffer) { 3592b411b363SPhilipp Reisner dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__); 3593b411b363SPhilipp Reisner goto out; 3594b411b363SPhilipp Reisner } 3595b411b363SPhilipp Reisner 3596b411b363SPhilipp Reisner c = (struct bm_xfer_ctx) { 3597b411b363SPhilipp Reisner .bm_bits = drbd_bm_bits(mdev), 3598b411b363SPhilipp Reisner .bm_words = drbd_bm_words(mdev), 3599b411b363SPhilipp Reisner }; 3600b411b363SPhilipp Reisner 36012c46407dSAndreas Gruenbacher for(;;) { 360202918be2SPhilipp Reisner if (cmd == P_BITMAP) { 36032c46407dSAndreas Gruenbacher err = receive_bitmap_plain(mdev, data_size, buffer, &c); 360402918be2SPhilipp Reisner } else if (cmd == P_COMPRESSED_BITMAP) { 3605b411b363SPhilipp Reisner /* MAYBE: sanity check that we speak proto >= 90, 3606b411b363SPhilipp Reisner * and the feature is enabled! */ 3607b411b363SPhilipp Reisner struct p_compressed_bm *p; 3608b411b363SPhilipp Reisner 360902918be2SPhilipp Reisner if (data_size > BM_PACKET_PAYLOAD_BYTES) { 3610b411b363SPhilipp Reisner dev_err(DEV, "ReportCBitmap packet too large\n"); 3611b411b363SPhilipp Reisner goto out; 3612b411b363SPhilipp Reisner } 3613b411b363SPhilipp Reisner /* use the page buff */ 3614b411b363SPhilipp Reisner p = buffer; 3615b411b363SPhilipp Reisner memcpy(p, h, sizeof(*h)); 361602918be2SPhilipp Reisner if (drbd_recv(mdev, p->head.payload, data_size) != data_size) 3617b411b363SPhilipp Reisner goto out; 3618004352faSLars Ellenberg if (data_size <= (sizeof(*p) - sizeof(p->head))) { 3619004352faSLars Ellenberg dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", data_size); 362078fcbdaeSAndreas Gruenbacher goto out; 3621b411b363SPhilipp Reisner } 3622c6d25cfeSPhilipp Reisner err = decode_bitmap_c(mdev, p, &c, data_size); 3623b411b363SPhilipp Reisner } else { 362402918be2SPhilipp Reisner dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", cmd); 3625b411b363SPhilipp Reisner goto out; 3626b411b363SPhilipp Reisner } 3627b411b363SPhilipp Reisner 362802918be2SPhilipp Reisner c.packets[cmd == P_BITMAP]++; 3629257d0af6SPhilipp Reisner c.bytes[cmd == P_BITMAP] += sizeof(struct p_header) + data_size; 3630b411b363SPhilipp Reisner 36312c46407dSAndreas Gruenbacher if (err <= 0) { 36322c46407dSAndreas Gruenbacher if (err < 0) 36332c46407dSAndreas Gruenbacher goto out; 3634b411b363SPhilipp Reisner break; 36352c46407dSAndreas Gruenbacher } 363602918be2SPhilipp Reisner if (!drbd_recv_header(mdev, &cmd, &data_size)) 3637b411b363SPhilipp Reisner goto out; 36382c46407dSAndreas Gruenbacher } 3639b411b363SPhilipp Reisner 3640b411b363SPhilipp Reisner INFO_bm_xfer_stats(mdev, "receive", &c); 3641b411b363SPhilipp Reisner 3642b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_BITMAP_T) { 3643de1f8e4aSAndreas Gruenbacher enum drbd_state_rv rv; 3644de1f8e4aSAndreas Gruenbacher 3645b411b363SPhilipp Reisner ok = !drbd_send_bitmap(mdev); 3646b411b363SPhilipp Reisner if (!ok) 3647b411b363SPhilipp Reisner goto out; 3648b411b363SPhilipp Reisner /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ 3649de1f8e4aSAndreas Gruenbacher rv = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); 3650de1f8e4aSAndreas Gruenbacher D_ASSERT(rv == SS_SUCCESS); 3651b411b363SPhilipp Reisner } else if (mdev->state.conn != C_WF_BITMAP_S) { 3652b411b363SPhilipp Reisner /* admin may have requested C_DISCONNECTING, 3653b411b363SPhilipp Reisner * other threads may have noticed network errors */ 3654b411b363SPhilipp Reisner dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n", 3655b411b363SPhilipp Reisner drbd_conn_str(mdev->state.conn)); 3656b411b363SPhilipp Reisner } 3657b411b363SPhilipp Reisner 365881e84650SAndreas Gruenbacher ok = true; 3659b411b363SPhilipp Reisner out: 366020ceb2b2SLars Ellenberg drbd_bm_unlock(mdev); 3661b411b363SPhilipp Reisner if (ok && mdev->state.conn == C_WF_BITMAP_S) 3662b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_SOURCE); 3663b411b363SPhilipp Reisner free_page((unsigned long) buffer); 3664b411b363SPhilipp Reisner return ok; 3665b411b363SPhilipp Reisner } 3666b411b363SPhilipp Reisner 3667d8763023SAndreas Gruenbacher static int receive_skip(struct drbd_conf *mdev, enum drbd_packet cmd, 3668d8763023SAndreas Gruenbacher unsigned int data_size) 3669b411b363SPhilipp Reisner { 3670b411b363SPhilipp Reisner /* TODO zero copy sink :) */ 3671b411b363SPhilipp Reisner static char sink[128]; 3672b411b363SPhilipp Reisner int size, want, r; 3673b411b363SPhilipp Reisner 3674b411b363SPhilipp Reisner dev_warn(DEV, "skipping unknown optional packet type %d, l: %d!\n", 367502918be2SPhilipp Reisner cmd, data_size); 3676b411b363SPhilipp Reisner 367702918be2SPhilipp Reisner size = data_size; 3678b411b363SPhilipp Reisner while (size > 0) { 3679b411b363SPhilipp Reisner want = min_t(int, size, sizeof(sink)); 3680b411b363SPhilipp Reisner r = drbd_recv(mdev, sink, want); 3681841ce241SAndreas Gruenbacher if (!expect(r > 0)) 3682841ce241SAndreas Gruenbacher break; 3683b411b363SPhilipp Reisner size -= r; 3684b411b363SPhilipp Reisner } 3685b411b363SPhilipp Reisner return size == 0; 3686b411b363SPhilipp Reisner } 3687b411b363SPhilipp Reisner 3688d8763023SAndreas Gruenbacher static int receive_UnplugRemote(struct drbd_conf *mdev, enum drbd_packet cmd, 3689d8763023SAndreas Gruenbacher unsigned int data_size) 3690b411b363SPhilipp Reisner { 3691b411b363SPhilipp Reisner /* Make sure we've acked all the TCP data associated 3692b411b363SPhilipp Reisner * with the data requests being unplugged */ 3693e42325a5SPhilipp Reisner drbd_tcp_quickack(mdev->tconn->data.socket); 3694b411b363SPhilipp Reisner 369581e84650SAndreas Gruenbacher return true; 3696b411b363SPhilipp Reisner } 3697b411b363SPhilipp Reisner 3698d8763023SAndreas Gruenbacher static int receive_out_of_sync(struct drbd_conf *mdev, enum drbd_packet cmd, 3699d8763023SAndreas Gruenbacher unsigned int data_size) 370073a01a18SPhilipp Reisner { 3701e42325a5SPhilipp Reisner struct p_block_desc *p = &mdev->tconn->data.rbuf.block_desc; 370273a01a18SPhilipp Reisner 3703f735e363SLars Ellenberg switch (mdev->state.conn) { 3704f735e363SLars Ellenberg case C_WF_SYNC_UUID: 3705f735e363SLars Ellenberg case C_WF_BITMAP_T: 3706f735e363SLars Ellenberg case C_BEHIND: 3707f735e363SLars Ellenberg break; 3708f735e363SLars Ellenberg default: 3709f735e363SLars Ellenberg dev_err(DEV, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n", 3710f735e363SLars Ellenberg drbd_conn_str(mdev->state.conn)); 3711f735e363SLars Ellenberg } 3712f735e363SLars Ellenberg 371373a01a18SPhilipp Reisner drbd_set_out_of_sync(mdev, be64_to_cpu(p->sector), be32_to_cpu(p->blksize)); 371473a01a18SPhilipp Reisner 371581e84650SAndreas Gruenbacher return true; 371673a01a18SPhilipp Reisner } 371773a01a18SPhilipp Reisner 3718d8763023SAndreas Gruenbacher typedef int (*drbd_cmd_handler_f)(struct drbd_conf *, enum drbd_packet cmd, 3719d8763023SAndreas Gruenbacher unsigned int to_receive); 3720b411b363SPhilipp Reisner 372102918be2SPhilipp Reisner struct data_cmd { 372202918be2SPhilipp Reisner int expect_payload; 372302918be2SPhilipp Reisner size_t pkt_size; 372402918be2SPhilipp Reisner drbd_cmd_handler_f function; 3725b411b363SPhilipp Reisner }; 3726b411b363SPhilipp Reisner 372702918be2SPhilipp Reisner static struct data_cmd drbd_cmd_handler[] = { 372802918be2SPhilipp Reisner [P_DATA] = { 1, sizeof(struct p_data), receive_Data }, 372902918be2SPhilipp Reisner [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply }, 373002918be2SPhilipp Reisner [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } , 373102918be2SPhilipp Reisner [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } , 3732257d0af6SPhilipp Reisner [P_BITMAP] = { 1, sizeof(struct p_header), receive_bitmap } , 3733257d0af6SPhilipp Reisner [P_COMPRESSED_BITMAP] = { 1, sizeof(struct p_header), receive_bitmap } , 3734257d0af6SPhilipp Reisner [P_UNPLUG_REMOTE] = { 0, sizeof(struct p_header), receive_UnplugRemote }, 373502918be2SPhilipp Reisner [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 373602918be2SPhilipp Reisner [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 3737257d0af6SPhilipp Reisner [P_SYNC_PARAM] = { 1, sizeof(struct p_header), receive_SyncParam }, 3738257d0af6SPhilipp Reisner [P_SYNC_PARAM89] = { 1, sizeof(struct p_header), receive_SyncParam }, 373902918be2SPhilipp Reisner [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol }, 374002918be2SPhilipp Reisner [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids }, 374102918be2SPhilipp Reisner [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes }, 374202918be2SPhilipp Reisner [P_STATE] = { 0, sizeof(struct p_state), receive_state }, 374302918be2SPhilipp Reisner [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state }, 374402918be2SPhilipp Reisner [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid }, 374502918be2SPhilipp Reisner [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 374602918be2SPhilipp Reisner [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 374702918be2SPhilipp Reisner [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 374802918be2SPhilipp Reisner [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip }, 374973a01a18SPhilipp Reisner [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync }, 375002918be2SPhilipp Reisner /* anything missing from this table is in 375102918be2SPhilipp Reisner * the asender_tbl, see get_asender_cmd */ 375202918be2SPhilipp Reisner [P_MAX_CMD] = { 0, 0, NULL }, 375302918be2SPhilipp Reisner }; 375402918be2SPhilipp Reisner 375502918be2SPhilipp Reisner /* All handler functions that expect a sub-header get that sub-heder in 3756e42325a5SPhilipp Reisner mdev->tconn->data.rbuf.header.head.payload. 375702918be2SPhilipp Reisner 3758e42325a5SPhilipp Reisner Usually in mdev->tconn->data.rbuf.header.head the callback can find the usual 375902918be2SPhilipp Reisner p_header, but they may not rely on that. Since there is also p_header95 ! 376002918be2SPhilipp Reisner */ 3761b411b363SPhilipp Reisner 3762b411b363SPhilipp Reisner static void drbdd(struct drbd_conf *mdev) 3763b411b363SPhilipp Reisner { 3764c012949aSPhilipp Reisner struct p_header *header = &mdev->tconn->data.rbuf.header; 376502918be2SPhilipp Reisner unsigned int packet_size; 3766d8763023SAndreas Gruenbacher enum drbd_packet cmd; 376702918be2SPhilipp Reisner size_t shs; /* sub header size */ 376802918be2SPhilipp Reisner int rv; 3769b411b363SPhilipp Reisner 3770e6b3ea83SPhilipp Reisner while (get_t_state(&mdev->tconn->receiver) == RUNNING) { 3771bc31fe33SPhilipp Reisner drbd_thread_current_set_cpu(mdev, &mdev->tconn->receiver); 377202918be2SPhilipp Reisner if (!drbd_recv_header(mdev, &cmd, &packet_size)) 377302918be2SPhilipp Reisner goto err_out; 377402918be2SPhilipp Reisner 377502918be2SPhilipp Reisner if (unlikely(cmd >= P_MAX_CMD || !drbd_cmd_handler[cmd].function)) { 377602918be2SPhilipp Reisner dev_err(DEV, "unknown packet type %d, l: %d!\n", cmd, packet_size); 377702918be2SPhilipp Reisner goto err_out; 37780b33a916SLars Ellenberg } 3779b411b363SPhilipp Reisner 3780c012949aSPhilipp Reisner shs = drbd_cmd_handler[cmd].pkt_size - sizeof(struct p_header); 3781c13f7e1aSLars Ellenberg if (packet_size - shs > 0 && !drbd_cmd_handler[cmd].expect_payload) { 3782c13f7e1aSLars Ellenberg dev_err(DEV, "No payload expected %s l:%d\n", cmdname(cmd), packet_size); 3783c13f7e1aSLars Ellenberg goto err_out; 3784c13f7e1aSLars Ellenberg } 3785c13f7e1aSLars Ellenberg 3786c13f7e1aSLars Ellenberg if (shs) { 3787c012949aSPhilipp Reisner rv = drbd_recv(mdev, &header->payload, shs); 378802918be2SPhilipp Reisner if (unlikely(rv != shs)) { 37890ddc5549SLars Ellenberg if (!signal_pending(current)) 37900ddc5549SLars Ellenberg dev_warn(DEV, "short read while reading sub header: rv=%d\n", rv); 379102918be2SPhilipp Reisner goto err_out; 3792b411b363SPhilipp Reisner } 379302918be2SPhilipp Reisner } 379402918be2SPhilipp Reisner 379502918be2SPhilipp Reisner rv = drbd_cmd_handler[cmd].function(mdev, cmd, packet_size - shs); 379602918be2SPhilipp Reisner 379702918be2SPhilipp Reisner if (unlikely(!rv)) { 3798b411b363SPhilipp Reisner dev_err(DEV, "error receiving %s, l: %d!\n", 379902918be2SPhilipp Reisner cmdname(cmd), packet_size); 380002918be2SPhilipp Reisner goto err_out; 3801b411b363SPhilipp Reisner } 3802b411b363SPhilipp Reisner } 380302918be2SPhilipp Reisner 380402918be2SPhilipp Reisner if (0) { 380502918be2SPhilipp Reisner err_out: 3806b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); 3807b411b363SPhilipp Reisner } 3808856c50c7SLars Ellenberg /* If we leave here, we probably want to update at least the 3809856c50c7SLars Ellenberg * "Connected" indicator on stable storage. Do so explicitly here. */ 3810856c50c7SLars Ellenberg drbd_md_sync(mdev); 3811b411b363SPhilipp Reisner } 3812b411b363SPhilipp Reisner 3813191d3cc8SPhilipp Reisner void drbd_flush_workqueue(struct drbd_tconn *tconn) 3814b411b363SPhilipp Reisner { 3815b411b363SPhilipp Reisner struct drbd_wq_barrier barr; 3816b411b363SPhilipp Reisner 3817b411b363SPhilipp Reisner barr.w.cb = w_prev_work_done; 3818b411b363SPhilipp Reisner init_completion(&barr.done); 3819191d3cc8SPhilipp Reisner drbd_queue_work(&tconn->data.work, &barr.w); 3820b411b363SPhilipp Reisner wait_for_completion(&barr.done); 3821b411b363SPhilipp Reisner } 3822b411b363SPhilipp Reisner 3823b411b363SPhilipp Reisner static void drbd_disconnect(struct drbd_conf *mdev) 3824b411b363SPhilipp Reisner { 3825b411b363SPhilipp Reisner enum drbd_fencing_p fp; 3826b411b363SPhilipp Reisner union drbd_state os, ns; 3827b411b363SPhilipp Reisner int rv = SS_UNKNOWN_ERROR; 3828b411b363SPhilipp Reisner unsigned int i; 3829b411b363SPhilipp Reisner 3830b411b363SPhilipp Reisner if (mdev->state.conn == C_STANDALONE) 3831b411b363SPhilipp Reisner return; 3832b411b363SPhilipp Reisner 3833b411b363SPhilipp Reisner /* asender does not clean up anything. it must not interfere, either */ 3834e6b3ea83SPhilipp Reisner drbd_thread_stop(&mdev->tconn->asender); 3835b411b363SPhilipp Reisner drbd_free_sock(mdev); 3836b411b363SPhilipp Reisner 383785719573SPhilipp Reisner /* wait for current activity to cease. */ 383887eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 3839b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 3840b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee); 3841b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->read_ee); 384287eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3843b411b363SPhilipp Reisner 3844b411b363SPhilipp Reisner /* We do not have data structures that would allow us to 3845b411b363SPhilipp Reisner * get the rs_pending_cnt down to 0 again. 3846b411b363SPhilipp Reisner * * On C_SYNC_TARGET we do not have any data structures describing 3847b411b363SPhilipp Reisner * the pending RSDataRequest's we have sent. 3848b411b363SPhilipp Reisner * * On C_SYNC_SOURCE there is no data structure that tracks 3849b411b363SPhilipp Reisner * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. 3850b411b363SPhilipp Reisner * And no, it is not the sum of the reference counts in the 3851b411b363SPhilipp Reisner * resync_LRU. The resync_LRU tracks the whole operation including 3852b411b363SPhilipp Reisner * the disk-IO, while the rs_pending_cnt only tracks the blocks 3853b411b363SPhilipp Reisner * on the fly. */ 3854b411b363SPhilipp Reisner drbd_rs_cancel_all(mdev); 3855b411b363SPhilipp Reisner mdev->rs_total = 0; 3856b411b363SPhilipp Reisner mdev->rs_failed = 0; 3857b411b363SPhilipp Reisner atomic_set(&mdev->rs_pending_cnt, 0); 3858b411b363SPhilipp Reisner wake_up(&mdev->misc_wait); 3859b411b363SPhilipp Reisner 38607fde2be9SPhilipp Reisner del_timer(&mdev->request_timer); 38617fde2be9SPhilipp Reisner 3862b411b363SPhilipp Reisner /* make sure syncer is stopped and w_resume_next_sg queued */ 3863b411b363SPhilipp Reisner del_timer_sync(&mdev->resync_timer); 3864b411b363SPhilipp Reisner resync_timer_fn((unsigned long)mdev); 3865b411b363SPhilipp Reisner 3866b411b363SPhilipp Reisner /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, 3867b411b363SPhilipp Reisner * w_make_resync_request etc. which may still be on the worker queue 3868b411b363SPhilipp Reisner * to be "canceled" */ 3869191d3cc8SPhilipp Reisner drbd_flush_workqueue(mdev->tconn); 3870b411b363SPhilipp Reisner 3871b411b363SPhilipp Reisner /* This also does reclaim_net_ee(). If we do this too early, we might 3872b411b363SPhilipp Reisner * miss some resync ee and pages.*/ 3873b411b363SPhilipp Reisner drbd_process_done_ee(mdev); 3874b411b363SPhilipp Reisner 3875b411b363SPhilipp Reisner kfree(mdev->p_uuid); 3876b411b363SPhilipp Reisner mdev->p_uuid = NULL; 3877b411b363SPhilipp Reisner 3878fb22c402SPhilipp Reisner if (!is_susp(mdev->state)) 3879b411b363SPhilipp Reisner tl_clear(mdev); 3880b411b363SPhilipp Reisner 3881b411b363SPhilipp Reisner dev_info(DEV, "Connection closed\n"); 3882b411b363SPhilipp Reisner 3883b411b363SPhilipp Reisner drbd_md_sync(mdev); 3884b411b363SPhilipp Reisner 3885b411b363SPhilipp Reisner fp = FP_DONT_CARE; 3886b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3887b411b363SPhilipp Reisner fp = mdev->ldev->dc.fencing; 3888b411b363SPhilipp Reisner put_ldev(mdev); 3889b411b363SPhilipp Reisner } 3890b411b363SPhilipp Reisner 389187f7be4cSPhilipp Reisner if (mdev->state.role == R_PRIMARY && fp >= FP_RESOURCE && mdev->state.pdsk >= D_UNKNOWN) 389287f7be4cSPhilipp Reisner drbd_try_outdate_peer_async(mdev); 3893b411b363SPhilipp Reisner 389487eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 3895b411b363SPhilipp Reisner os = mdev->state; 3896b411b363SPhilipp Reisner if (os.conn >= C_UNCONNECTED) { 3897b411b363SPhilipp Reisner /* Do not restart in case we are C_DISCONNECTING */ 3898b411b363SPhilipp Reisner ns = os; 3899b411b363SPhilipp Reisner ns.conn = C_UNCONNECTED; 3900b411b363SPhilipp Reisner rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); 3901b411b363SPhilipp Reisner } 390287eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3903b411b363SPhilipp Reisner 3904b411b363SPhilipp Reisner if (os.conn == C_DISCONNECTING) { 3905b2fb6dbeSPhilipp Reisner wait_event(mdev->tconn->net_cnt_wait, atomic_read(&mdev->tconn->net_cnt) == 0); 3906b411b363SPhilipp Reisner 3907a0638456SPhilipp Reisner crypto_free_hash(mdev->tconn->cram_hmac_tfm); 3908a0638456SPhilipp Reisner mdev->tconn->cram_hmac_tfm = NULL; 3909b411b363SPhilipp Reisner 391089e58e75SPhilipp Reisner kfree(mdev->tconn->net_conf); 391189e58e75SPhilipp Reisner mdev->tconn->net_conf = NULL; 3912b411b363SPhilipp Reisner drbd_request_state(mdev, NS(conn, C_STANDALONE)); 3913b411b363SPhilipp Reisner } 3914b411b363SPhilipp Reisner 391520ceb2b2SLars Ellenberg /* serialize with bitmap writeout triggered by the state change, 391620ceb2b2SLars Ellenberg * if any. */ 391720ceb2b2SLars Ellenberg wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags)); 391820ceb2b2SLars Ellenberg 3919b411b363SPhilipp Reisner /* tcp_close and release of sendpage pages can be deferred. I don't 3920b411b363SPhilipp Reisner * want to use SO_LINGER, because apparently it can be deferred for 3921b411b363SPhilipp Reisner * more than 20 seconds (longest time I checked). 3922b411b363SPhilipp Reisner * 3923b411b363SPhilipp Reisner * Actually we don't care for exactly when the network stack does its 3924b411b363SPhilipp Reisner * put_page(), but release our reference on these pages right here. 3925b411b363SPhilipp Reisner */ 3926b411b363SPhilipp Reisner i = drbd_release_ee(mdev, &mdev->net_ee); 3927b411b363SPhilipp Reisner if (i) 3928b411b363SPhilipp Reisner dev_info(DEV, "net_ee not empty, killed %u entries\n", i); 3929435f0740SLars Ellenberg i = atomic_read(&mdev->pp_in_use_by_net); 3930435f0740SLars Ellenberg if (i) 3931435f0740SLars Ellenberg dev_info(DEV, "pp_in_use_by_net = %d, expected 0\n", i); 3932b411b363SPhilipp Reisner i = atomic_read(&mdev->pp_in_use); 3933b411b363SPhilipp Reisner if (i) 393445bb912bSLars Ellenberg dev_info(DEV, "pp_in_use = %d, expected 0\n", i); 3935b411b363SPhilipp Reisner 3936b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->read_ee)); 3937b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->active_ee)); 3938b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->sync_ee)); 3939b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->done_ee)); 3940b411b363SPhilipp Reisner 3941b411b363SPhilipp Reisner /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ 3942b411b363SPhilipp Reisner atomic_set(&mdev->current_epoch->epoch_size, 0); 3943b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->current_epoch->list)); 3944b411b363SPhilipp Reisner } 3945b411b363SPhilipp Reisner 3946b411b363SPhilipp Reisner /* 3947b411b363SPhilipp Reisner * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version 3948b411b363SPhilipp Reisner * we can agree on is stored in agreed_pro_version. 3949b411b363SPhilipp Reisner * 3950b411b363SPhilipp Reisner * feature flags and the reserved array should be enough room for future 3951b411b363SPhilipp Reisner * enhancements of the handshake protocol, and possible plugins... 3952b411b363SPhilipp Reisner * 3953b411b363SPhilipp Reisner * for now, they are expected to be zero, but ignored. 3954b411b363SPhilipp Reisner */ 3955b411b363SPhilipp Reisner static int drbd_send_handshake(struct drbd_conf *mdev) 3956b411b363SPhilipp Reisner { 3957e6b3ea83SPhilipp Reisner /* ASSERT current == mdev->tconn->receiver ... */ 3958e42325a5SPhilipp Reisner struct p_handshake *p = &mdev->tconn->data.sbuf.handshake; 3959b411b363SPhilipp Reisner int ok; 3960b411b363SPhilipp Reisner 3961e42325a5SPhilipp Reisner if (mutex_lock_interruptible(&mdev->tconn->data.mutex)) { 3962b411b363SPhilipp Reisner dev_err(DEV, "interrupted during initial handshake\n"); 3963b411b363SPhilipp Reisner return 0; /* interrupted. not ok. */ 3964b411b363SPhilipp Reisner } 3965b411b363SPhilipp Reisner 3966e42325a5SPhilipp Reisner if (mdev->tconn->data.socket == NULL) { 3967e42325a5SPhilipp Reisner mutex_unlock(&mdev->tconn->data.mutex); 3968b411b363SPhilipp Reisner return 0; 3969b411b363SPhilipp Reisner } 3970b411b363SPhilipp Reisner 3971b411b363SPhilipp Reisner memset(p, 0, sizeof(*p)); 3972b411b363SPhilipp Reisner p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); 3973b411b363SPhilipp Reisner p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); 3974e42325a5SPhilipp Reisner ok = _drbd_send_cmd(mdev, mdev->tconn->data.socket, P_HAND_SHAKE, 3975c012949aSPhilipp Reisner &p->head, sizeof(*p), 0 ); 3976e42325a5SPhilipp Reisner mutex_unlock(&mdev->tconn->data.mutex); 3977b411b363SPhilipp Reisner return ok; 3978b411b363SPhilipp Reisner } 3979b411b363SPhilipp Reisner 3980b411b363SPhilipp Reisner /* 3981b411b363SPhilipp Reisner * return values: 3982b411b363SPhilipp Reisner * 1 yes, we have a valid connection 3983b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 3984b411b363SPhilipp Reisner * -1 peer talks different language, 3985b411b363SPhilipp Reisner * no point in trying again, please go standalone. 3986b411b363SPhilipp Reisner */ 3987b411b363SPhilipp Reisner static int drbd_do_handshake(struct drbd_conf *mdev) 3988b411b363SPhilipp Reisner { 3989e6b3ea83SPhilipp Reisner /* ASSERT current == mdev->tconn->receiver ... */ 3990e42325a5SPhilipp Reisner struct p_handshake *p = &mdev->tconn->data.rbuf.handshake; 399102918be2SPhilipp Reisner const int expect = sizeof(struct p_handshake) - sizeof(struct p_header80); 399202918be2SPhilipp Reisner unsigned int length; 3993d8763023SAndreas Gruenbacher enum drbd_packet cmd; 3994b411b363SPhilipp Reisner int rv; 3995b411b363SPhilipp Reisner 3996b411b363SPhilipp Reisner rv = drbd_send_handshake(mdev); 3997b411b363SPhilipp Reisner if (!rv) 3998b411b363SPhilipp Reisner return 0; 3999b411b363SPhilipp Reisner 400002918be2SPhilipp Reisner rv = drbd_recv_header(mdev, &cmd, &length); 4001b411b363SPhilipp Reisner if (!rv) 4002b411b363SPhilipp Reisner return 0; 4003b411b363SPhilipp Reisner 400402918be2SPhilipp Reisner if (cmd != P_HAND_SHAKE) { 4005b411b363SPhilipp Reisner dev_err(DEV, "expected HandShake packet, received: %s (0x%04x)\n", 400602918be2SPhilipp Reisner cmdname(cmd), cmd); 4007b411b363SPhilipp Reisner return -1; 4008b411b363SPhilipp Reisner } 4009b411b363SPhilipp Reisner 401002918be2SPhilipp Reisner if (length != expect) { 4011b411b363SPhilipp Reisner dev_err(DEV, "expected HandShake length: %u, received: %u\n", 401202918be2SPhilipp Reisner expect, length); 4013b411b363SPhilipp Reisner return -1; 4014b411b363SPhilipp Reisner } 4015b411b363SPhilipp Reisner 4016b411b363SPhilipp Reisner rv = drbd_recv(mdev, &p->head.payload, expect); 4017b411b363SPhilipp Reisner 4018b411b363SPhilipp Reisner if (rv != expect) { 40190ddc5549SLars Ellenberg if (!signal_pending(current)) 40200ddc5549SLars Ellenberg dev_warn(DEV, "short read receiving handshake packet: l=%u\n", rv); 4021b411b363SPhilipp Reisner return 0; 4022b411b363SPhilipp Reisner } 4023b411b363SPhilipp Reisner 4024b411b363SPhilipp Reisner p->protocol_min = be32_to_cpu(p->protocol_min); 4025b411b363SPhilipp Reisner p->protocol_max = be32_to_cpu(p->protocol_max); 4026b411b363SPhilipp Reisner if (p->protocol_max == 0) 4027b411b363SPhilipp Reisner p->protocol_max = p->protocol_min; 4028b411b363SPhilipp Reisner 4029b411b363SPhilipp Reisner if (PRO_VERSION_MAX < p->protocol_min || 4030b411b363SPhilipp Reisner PRO_VERSION_MIN > p->protocol_max) 4031b411b363SPhilipp Reisner goto incompat; 4032b411b363SPhilipp Reisner 403331890f4aSPhilipp Reisner mdev->tconn->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); 4034b411b363SPhilipp Reisner 4035b411b363SPhilipp Reisner dev_info(DEV, "Handshake successful: " 403631890f4aSPhilipp Reisner "Agreed network protocol version %d\n", mdev->tconn->agreed_pro_version); 4037b411b363SPhilipp Reisner 4038b411b363SPhilipp Reisner return 1; 4039b411b363SPhilipp Reisner 4040b411b363SPhilipp Reisner incompat: 4041b411b363SPhilipp Reisner dev_err(DEV, "incompatible DRBD dialects: " 4042b411b363SPhilipp Reisner "I support %d-%d, peer supports %d-%d\n", 4043b411b363SPhilipp Reisner PRO_VERSION_MIN, PRO_VERSION_MAX, 4044b411b363SPhilipp Reisner p->protocol_min, p->protocol_max); 4045b411b363SPhilipp Reisner return -1; 4046b411b363SPhilipp Reisner } 4047b411b363SPhilipp Reisner 4048b411b363SPhilipp Reisner #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) 4049b411b363SPhilipp Reisner static int drbd_do_auth(struct drbd_conf *mdev) 4050b411b363SPhilipp Reisner { 4051b411b363SPhilipp Reisner dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); 4052b411b363SPhilipp Reisner dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); 4053b10d96cbSJohannes Thoma return -1; 4054b411b363SPhilipp Reisner } 4055b411b363SPhilipp Reisner #else 4056b411b363SPhilipp Reisner #define CHALLENGE_LEN 64 4057b10d96cbSJohannes Thoma 4058b10d96cbSJohannes Thoma /* Return value: 4059b10d96cbSJohannes Thoma 1 - auth succeeded, 4060b10d96cbSJohannes Thoma 0 - failed, try again (network error), 4061b10d96cbSJohannes Thoma -1 - auth failed, don't try again. 4062b10d96cbSJohannes Thoma */ 4063b10d96cbSJohannes Thoma 4064b411b363SPhilipp Reisner static int drbd_do_auth(struct drbd_conf *mdev) 4065b411b363SPhilipp Reisner { 4066b411b363SPhilipp Reisner char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ 4067b411b363SPhilipp Reisner struct scatterlist sg; 4068b411b363SPhilipp Reisner char *response = NULL; 4069b411b363SPhilipp Reisner char *right_response = NULL; 4070b411b363SPhilipp Reisner char *peers_ch = NULL; 407189e58e75SPhilipp Reisner unsigned int key_len = strlen(mdev->tconn->net_conf->shared_secret); 4072b411b363SPhilipp Reisner unsigned int resp_size; 4073b411b363SPhilipp Reisner struct hash_desc desc; 4074d8763023SAndreas Gruenbacher enum drbd_packet cmd; 407502918be2SPhilipp Reisner unsigned int length; 4076b411b363SPhilipp Reisner int rv; 4077b411b363SPhilipp Reisner 4078a0638456SPhilipp Reisner desc.tfm = mdev->tconn->cram_hmac_tfm; 4079b411b363SPhilipp Reisner desc.flags = 0; 4080b411b363SPhilipp Reisner 4081a0638456SPhilipp Reisner rv = crypto_hash_setkey(mdev->tconn->cram_hmac_tfm, 408289e58e75SPhilipp Reisner (u8 *)mdev->tconn->net_conf->shared_secret, key_len); 4083b411b363SPhilipp Reisner if (rv) { 4084b411b363SPhilipp Reisner dev_err(DEV, "crypto_hash_setkey() failed with %d\n", rv); 4085b10d96cbSJohannes Thoma rv = -1; 4086b411b363SPhilipp Reisner goto fail; 4087b411b363SPhilipp Reisner } 4088b411b363SPhilipp Reisner 4089b411b363SPhilipp Reisner get_random_bytes(my_challenge, CHALLENGE_LEN); 4090b411b363SPhilipp Reisner 4091b411b363SPhilipp Reisner rv = drbd_send_cmd2(mdev, P_AUTH_CHALLENGE, my_challenge, CHALLENGE_LEN); 4092b411b363SPhilipp Reisner if (!rv) 4093b411b363SPhilipp Reisner goto fail; 4094b411b363SPhilipp Reisner 409502918be2SPhilipp Reisner rv = drbd_recv_header(mdev, &cmd, &length); 4096b411b363SPhilipp Reisner if (!rv) 4097b411b363SPhilipp Reisner goto fail; 4098b411b363SPhilipp Reisner 409902918be2SPhilipp Reisner if (cmd != P_AUTH_CHALLENGE) { 4100b411b363SPhilipp Reisner dev_err(DEV, "expected AuthChallenge packet, received: %s (0x%04x)\n", 410102918be2SPhilipp Reisner cmdname(cmd), cmd); 4102b411b363SPhilipp Reisner rv = 0; 4103b411b363SPhilipp Reisner goto fail; 4104b411b363SPhilipp Reisner } 4105b411b363SPhilipp Reisner 410602918be2SPhilipp Reisner if (length > CHALLENGE_LEN * 2) { 4107b411b363SPhilipp Reisner dev_err(DEV, "expected AuthChallenge payload too big.\n"); 4108b10d96cbSJohannes Thoma rv = -1; 4109b411b363SPhilipp Reisner goto fail; 4110b411b363SPhilipp Reisner } 4111b411b363SPhilipp Reisner 411202918be2SPhilipp Reisner peers_ch = kmalloc(length, GFP_NOIO); 4113b411b363SPhilipp Reisner if (peers_ch == NULL) { 4114b411b363SPhilipp Reisner dev_err(DEV, "kmalloc of peers_ch failed\n"); 4115b10d96cbSJohannes Thoma rv = -1; 4116b411b363SPhilipp Reisner goto fail; 4117b411b363SPhilipp Reisner } 4118b411b363SPhilipp Reisner 411902918be2SPhilipp Reisner rv = drbd_recv(mdev, peers_ch, length); 4120b411b363SPhilipp Reisner 412102918be2SPhilipp Reisner if (rv != length) { 41220ddc5549SLars Ellenberg if (!signal_pending(current)) 41230ddc5549SLars Ellenberg dev_warn(DEV, "short read AuthChallenge: l=%u\n", rv); 4124b411b363SPhilipp Reisner rv = 0; 4125b411b363SPhilipp Reisner goto fail; 4126b411b363SPhilipp Reisner } 4127b411b363SPhilipp Reisner 4128a0638456SPhilipp Reisner resp_size = crypto_hash_digestsize(mdev->tconn->cram_hmac_tfm); 4129b411b363SPhilipp Reisner response = kmalloc(resp_size, GFP_NOIO); 4130b411b363SPhilipp Reisner if (response == NULL) { 4131b411b363SPhilipp Reisner dev_err(DEV, "kmalloc of response failed\n"); 4132b10d96cbSJohannes Thoma rv = -1; 4133b411b363SPhilipp Reisner goto fail; 4134b411b363SPhilipp Reisner } 4135b411b363SPhilipp Reisner 4136b411b363SPhilipp Reisner sg_init_table(&sg, 1); 413702918be2SPhilipp Reisner sg_set_buf(&sg, peers_ch, length); 4138b411b363SPhilipp Reisner 4139b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, response); 4140b411b363SPhilipp Reisner if (rv) { 4141b411b363SPhilipp Reisner dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv); 4142b10d96cbSJohannes Thoma rv = -1; 4143b411b363SPhilipp Reisner goto fail; 4144b411b363SPhilipp Reisner } 4145b411b363SPhilipp Reisner 4146b411b363SPhilipp Reisner rv = drbd_send_cmd2(mdev, P_AUTH_RESPONSE, response, resp_size); 4147b411b363SPhilipp Reisner if (!rv) 4148b411b363SPhilipp Reisner goto fail; 4149b411b363SPhilipp Reisner 415002918be2SPhilipp Reisner rv = drbd_recv_header(mdev, &cmd, &length); 4151b411b363SPhilipp Reisner if (!rv) 4152b411b363SPhilipp Reisner goto fail; 4153b411b363SPhilipp Reisner 415402918be2SPhilipp Reisner if (cmd != P_AUTH_RESPONSE) { 4155b411b363SPhilipp Reisner dev_err(DEV, "expected AuthResponse packet, received: %s (0x%04x)\n", 415602918be2SPhilipp Reisner cmdname(cmd), cmd); 4157b411b363SPhilipp Reisner rv = 0; 4158b411b363SPhilipp Reisner goto fail; 4159b411b363SPhilipp Reisner } 4160b411b363SPhilipp Reisner 416102918be2SPhilipp Reisner if (length != resp_size) { 4162b411b363SPhilipp Reisner dev_err(DEV, "expected AuthResponse payload of wrong size\n"); 4163b411b363SPhilipp Reisner rv = 0; 4164b411b363SPhilipp Reisner goto fail; 4165b411b363SPhilipp Reisner } 4166b411b363SPhilipp Reisner 4167b411b363SPhilipp Reisner rv = drbd_recv(mdev, response , resp_size); 4168b411b363SPhilipp Reisner 4169b411b363SPhilipp Reisner if (rv != resp_size) { 41700ddc5549SLars Ellenberg if (!signal_pending(current)) 41710ddc5549SLars Ellenberg dev_warn(DEV, "short read receiving AuthResponse: l=%u\n", rv); 4172b411b363SPhilipp Reisner rv = 0; 4173b411b363SPhilipp Reisner goto fail; 4174b411b363SPhilipp Reisner } 4175b411b363SPhilipp Reisner 4176b411b363SPhilipp Reisner right_response = kmalloc(resp_size, GFP_NOIO); 41772d1ee87dSJulia Lawall if (right_response == NULL) { 4178b411b363SPhilipp Reisner dev_err(DEV, "kmalloc of right_response failed\n"); 4179b10d96cbSJohannes Thoma rv = -1; 4180b411b363SPhilipp Reisner goto fail; 4181b411b363SPhilipp Reisner } 4182b411b363SPhilipp Reisner 4183b411b363SPhilipp Reisner sg_set_buf(&sg, my_challenge, CHALLENGE_LEN); 4184b411b363SPhilipp Reisner 4185b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, right_response); 4186b411b363SPhilipp Reisner if (rv) { 4187b411b363SPhilipp Reisner dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv); 4188b10d96cbSJohannes Thoma rv = -1; 4189b411b363SPhilipp Reisner goto fail; 4190b411b363SPhilipp Reisner } 4191b411b363SPhilipp Reisner 4192b411b363SPhilipp Reisner rv = !memcmp(response, right_response, resp_size); 4193b411b363SPhilipp Reisner 4194b411b363SPhilipp Reisner if (rv) 4195b411b363SPhilipp Reisner dev_info(DEV, "Peer authenticated using %d bytes of '%s' HMAC\n", 419689e58e75SPhilipp Reisner resp_size, mdev->tconn->net_conf->cram_hmac_alg); 4197b10d96cbSJohannes Thoma else 4198b10d96cbSJohannes Thoma rv = -1; 4199b411b363SPhilipp Reisner 4200b411b363SPhilipp Reisner fail: 4201b411b363SPhilipp Reisner kfree(peers_ch); 4202b411b363SPhilipp Reisner kfree(response); 4203b411b363SPhilipp Reisner kfree(right_response); 4204b411b363SPhilipp Reisner 4205b411b363SPhilipp Reisner return rv; 4206b411b363SPhilipp Reisner } 4207b411b363SPhilipp Reisner #endif 4208b411b363SPhilipp Reisner 4209b411b363SPhilipp Reisner int drbdd_init(struct drbd_thread *thi) 4210b411b363SPhilipp Reisner { 4211b411b363SPhilipp Reisner struct drbd_conf *mdev = thi->mdev; 4212b411b363SPhilipp Reisner unsigned int minor = mdev_to_minor(mdev); 4213b411b363SPhilipp Reisner int h; 4214b411b363SPhilipp Reisner 4215b411b363SPhilipp Reisner sprintf(current->comm, "drbd%d_receiver", minor); 4216b411b363SPhilipp Reisner 4217b411b363SPhilipp Reisner dev_info(DEV, "receiver (re)started\n"); 4218b411b363SPhilipp Reisner 4219b411b363SPhilipp Reisner do { 4220b411b363SPhilipp Reisner h = drbd_connect(mdev); 4221b411b363SPhilipp Reisner if (h == 0) { 4222b411b363SPhilipp Reisner drbd_disconnect(mdev); 422320ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ); 4224b411b363SPhilipp Reisner } 4225b411b363SPhilipp Reisner if (h == -1) { 4226b411b363SPhilipp Reisner dev_warn(DEV, "Discarding network configuration.\n"); 4227b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 4228b411b363SPhilipp Reisner } 4229b411b363SPhilipp Reisner } while (h == 0); 4230b411b363SPhilipp Reisner 4231b411b363SPhilipp Reisner if (h > 0) { 4232b2fb6dbeSPhilipp Reisner if (get_net_conf(mdev->tconn)) { 4233b411b363SPhilipp Reisner drbdd(mdev); 4234b2fb6dbeSPhilipp Reisner put_net_conf(mdev->tconn); 4235b411b363SPhilipp Reisner } 4236b411b363SPhilipp Reisner } 4237b411b363SPhilipp Reisner 4238b411b363SPhilipp Reisner drbd_disconnect(mdev); 4239b411b363SPhilipp Reisner 4240b411b363SPhilipp Reisner dev_info(DEV, "receiver terminated\n"); 4241b411b363SPhilipp Reisner return 0; 4242b411b363SPhilipp Reisner } 4243b411b363SPhilipp Reisner 4244b411b363SPhilipp Reisner /* ********* acknowledge sender ******** */ 4245b411b363SPhilipp Reisner 4246d8763023SAndreas Gruenbacher static int got_RqSReply(struct drbd_conf *mdev, enum drbd_packet cmd) 4247b411b363SPhilipp Reisner { 4248257d0af6SPhilipp Reisner struct p_req_state_reply *p = &mdev->tconn->meta.rbuf.req_state_reply; 4249b411b363SPhilipp Reisner 4250b411b363SPhilipp Reisner int retcode = be32_to_cpu(p->retcode); 4251b411b363SPhilipp Reisner 4252b411b363SPhilipp Reisner if (retcode >= SS_SUCCESS) { 4253b411b363SPhilipp Reisner set_bit(CL_ST_CHG_SUCCESS, &mdev->flags); 4254b411b363SPhilipp Reisner } else { 4255b411b363SPhilipp Reisner set_bit(CL_ST_CHG_FAIL, &mdev->flags); 4256b411b363SPhilipp Reisner dev_err(DEV, "Requested state change failed by peer: %s (%d)\n", 4257b411b363SPhilipp Reisner drbd_set_st_err_str(retcode), retcode); 4258b411b363SPhilipp Reisner } 4259b411b363SPhilipp Reisner wake_up(&mdev->state_wait); 4260b411b363SPhilipp Reisner 426181e84650SAndreas Gruenbacher return true; 4262b411b363SPhilipp Reisner } 4263b411b363SPhilipp Reisner 4264d8763023SAndreas Gruenbacher static int got_Ping(struct drbd_conf *mdev, enum drbd_packet cmd) 4265b411b363SPhilipp Reisner { 4266b411b363SPhilipp Reisner return drbd_send_ping_ack(mdev); 4267b411b363SPhilipp Reisner 4268b411b363SPhilipp Reisner } 4269b411b363SPhilipp Reisner 4270d8763023SAndreas Gruenbacher static int got_PingAck(struct drbd_conf *mdev, enum drbd_packet cmd) 4271b411b363SPhilipp Reisner { 4272b411b363SPhilipp Reisner /* restore idle timeout */ 4273e42325a5SPhilipp Reisner mdev->tconn->meta.socket->sk->sk_rcvtimeo = mdev->tconn->net_conf->ping_int*HZ; 4274309d1608SPhilipp Reisner if (!test_and_set_bit(GOT_PING_ACK, &mdev->flags)) 4275309d1608SPhilipp Reisner wake_up(&mdev->misc_wait); 4276b411b363SPhilipp Reisner 427781e84650SAndreas Gruenbacher return true; 4278b411b363SPhilipp Reisner } 4279b411b363SPhilipp Reisner 4280d8763023SAndreas Gruenbacher static int got_IsInSync(struct drbd_conf *mdev, enum drbd_packet cmd) 4281b411b363SPhilipp Reisner { 4282257d0af6SPhilipp Reisner struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack; 4283b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4284b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4285b411b363SPhilipp Reisner 428631890f4aSPhilipp Reisner D_ASSERT(mdev->tconn->agreed_pro_version >= 89); 4287b411b363SPhilipp Reisner 4288b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4289b411b363SPhilipp Reisner 42901d53f09eSLars Ellenberg if (get_ldev(mdev)) { 4291b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4292b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4293b411b363SPhilipp Reisner /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ 4294b411b363SPhilipp Reisner mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); 42951d53f09eSLars Ellenberg put_ldev(mdev); 42961d53f09eSLars Ellenberg } 4297b411b363SPhilipp Reisner dec_rs_pending(mdev); 4298778f271dSPhilipp Reisner atomic_add(blksize >> 9, &mdev->rs_sect_in); 4299b411b363SPhilipp Reisner 430081e84650SAndreas Gruenbacher return true; 4301b411b363SPhilipp Reisner } 4302b411b363SPhilipp Reisner 4303bc9c5c41SAndreas Gruenbacher static int 4304bc9c5c41SAndreas Gruenbacher validate_req_change_req_state(struct drbd_conf *mdev, u64 id, sector_t sector, 4305bc9c5c41SAndreas Gruenbacher struct rb_root *root, const char *func, 4306bc9c5c41SAndreas Gruenbacher enum drbd_req_event what, bool missing_ok) 4307b411b363SPhilipp Reisner { 4308b411b363SPhilipp Reisner struct drbd_request *req; 4309b411b363SPhilipp Reisner struct bio_and_error m; 4310b411b363SPhilipp Reisner 431187eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 4312bc9c5c41SAndreas Gruenbacher req = find_request(mdev, root, id, sector, missing_ok, func); 4313b411b363SPhilipp Reisner if (unlikely(!req)) { 431487eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 431581e84650SAndreas Gruenbacher return false; 4316b411b363SPhilipp Reisner } 4317b411b363SPhilipp Reisner __req_mod(req, what, &m); 431887eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 4319b411b363SPhilipp Reisner 4320b411b363SPhilipp Reisner if (m.bio) 4321b411b363SPhilipp Reisner complete_master_bio(mdev, &m); 432281e84650SAndreas Gruenbacher return true; 4323b411b363SPhilipp Reisner } 4324b411b363SPhilipp Reisner 4325d8763023SAndreas Gruenbacher static int got_BlockAck(struct drbd_conf *mdev, enum drbd_packet cmd) 4326b411b363SPhilipp Reisner { 4327257d0af6SPhilipp Reisner struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack; 4328b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4329b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4330b411b363SPhilipp Reisner enum drbd_req_event what; 4331b411b363SPhilipp Reisner 4332b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4333b411b363SPhilipp Reisner 4334579b57edSAndreas Gruenbacher if (p->block_id == ID_SYNCER) { 4335b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4336b411b363SPhilipp Reisner dec_rs_pending(mdev); 433781e84650SAndreas Gruenbacher return true; 4338b411b363SPhilipp Reisner } 4339257d0af6SPhilipp Reisner switch (cmd) { 4340b411b363SPhilipp Reisner case P_RS_WRITE_ACK: 434189e58e75SPhilipp Reisner D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C); 43428554df1cSAndreas Gruenbacher what = WRITE_ACKED_BY_PEER_AND_SIS; 4343b411b363SPhilipp Reisner break; 4344b411b363SPhilipp Reisner case P_WRITE_ACK: 434589e58e75SPhilipp Reisner D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C); 43468554df1cSAndreas Gruenbacher what = WRITE_ACKED_BY_PEER; 4347b411b363SPhilipp Reisner break; 4348b411b363SPhilipp Reisner case P_RECV_ACK: 434989e58e75SPhilipp Reisner D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_B); 43508554df1cSAndreas Gruenbacher what = RECV_ACKED_BY_PEER; 4351b411b363SPhilipp Reisner break; 4352b411b363SPhilipp Reisner case P_DISCARD_ACK: 435389e58e75SPhilipp Reisner D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C); 43548554df1cSAndreas Gruenbacher what = CONFLICT_DISCARDED_BY_PEER; 4355b411b363SPhilipp Reisner break; 4356b411b363SPhilipp Reisner default: 4357b411b363SPhilipp Reisner D_ASSERT(0); 435881e84650SAndreas Gruenbacher return false; 4359b411b363SPhilipp Reisner } 4360b411b363SPhilipp Reisner 4361b411b363SPhilipp Reisner return validate_req_change_req_state(mdev, p->block_id, sector, 4362bc9c5c41SAndreas Gruenbacher &mdev->write_requests, __func__, 4363bc9c5c41SAndreas Gruenbacher what, false); 4364b411b363SPhilipp Reisner } 4365b411b363SPhilipp Reisner 4366d8763023SAndreas Gruenbacher static int got_NegAck(struct drbd_conf *mdev, enum drbd_packet cmd) 4367b411b363SPhilipp Reisner { 4368257d0af6SPhilipp Reisner struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack; 4369b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 43702deb8336SPhilipp Reisner int size = be32_to_cpu(p->blksize); 437189e58e75SPhilipp Reisner bool missing_ok = mdev->tconn->net_conf->wire_protocol == DRBD_PROT_A || 437289e58e75SPhilipp Reisner mdev->tconn->net_conf->wire_protocol == DRBD_PROT_B; 4373c3afd8f5SAndreas Gruenbacher bool found; 4374b411b363SPhilipp Reisner 4375b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4376b411b363SPhilipp Reisner 4377579b57edSAndreas Gruenbacher if (p->block_id == ID_SYNCER) { 4378b411b363SPhilipp Reisner dec_rs_pending(mdev); 4379b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 438081e84650SAndreas Gruenbacher return true; 4381b411b363SPhilipp Reisner } 43822deb8336SPhilipp Reisner 4383c3afd8f5SAndreas Gruenbacher found = validate_req_change_req_state(mdev, p->block_id, sector, 4384bc9c5c41SAndreas Gruenbacher &mdev->write_requests, __func__, 43858554df1cSAndreas Gruenbacher NEG_ACKED, missing_ok); 4386c3afd8f5SAndreas Gruenbacher if (!found) { 43872deb8336SPhilipp Reisner /* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs. 43882deb8336SPhilipp Reisner The master bio might already be completed, therefore the 4389c3afd8f5SAndreas Gruenbacher request is no longer in the collision hash. */ 43902deb8336SPhilipp Reisner /* In Protocol B we might already have got a P_RECV_ACK 43912deb8336SPhilipp Reisner but then get a P_NEG_ACK afterwards. */ 4392c3afd8f5SAndreas Gruenbacher if (!missing_ok) 43932deb8336SPhilipp Reisner return false; 4394c3afd8f5SAndreas Gruenbacher drbd_set_out_of_sync(mdev, sector, size); 43952deb8336SPhilipp Reisner } 43962deb8336SPhilipp Reisner return true; 4397b411b363SPhilipp Reisner } 4398b411b363SPhilipp Reisner 4399d8763023SAndreas Gruenbacher static int got_NegDReply(struct drbd_conf *mdev, enum drbd_packet cmd) 4400b411b363SPhilipp Reisner { 4401257d0af6SPhilipp Reisner struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack; 4402b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4403b411b363SPhilipp Reisner 4404b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4405b411b363SPhilipp Reisner dev_err(DEV, "Got NegDReply; Sector %llus, len %u; Fail original request.\n", 4406b411b363SPhilipp Reisner (unsigned long long)sector, be32_to_cpu(p->blksize)); 4407b411b363SPhilipp Reisner 4408b411b363SPhilipp Reisner return validate_req_change_req_state(mdev, p->block_id, sector, 4409bc9c5c41SAndreas Gruenbacher &mdev->read_requests, __func__, 44108554df1cSAndreas Gruenbacher NEG_ACKED, false); 4411b411b363SPhilipp Reisner } 4412b411b363SPhilipp Reisner 4413d8763023SAndreas Gruenbacher static int got_NegRSDReply(struct drbd_conf *mdev, enum drbd_packet cmd) 4414b411b363SPhilipp Reisner { 4415b411b363SPhilipp Reisner sector_t sector; 4416b411b363SPhilipp Reisner int size; 4417257d0af6SPhilipp Reisner struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack; 4418b411b363SPhilipp Reisner 4419b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4420b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4421b411b363SPhilipp Reisner 4422b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4423b411b363SPhilipp Reisner 4424b411b363SPhilipp Reisner dec_rs_pending(mdev); 4425b411b363SPhilipp Reisner 4426b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_FAILED)) { 4427b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4428257d0af6SPhilipp Reisner switch (cmd) { 4429d612d309SPhilipp Reisner case P_NEG_RS_DREPLY: 4430b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 4431d612d309SPhilipp Reisner case P_RS_CANCEL: 4432d612d309SPhilipp Reisner break; 4433d612d309SPhilipp Reisner default: 4434d612d309SPhilipp Reisner D_ASSERT(0); 4435d612d309SPhilipp Reisner put_ldev(mdev); 4436d612d309SPhilipp Reisner return false; 4437d612d309SPhilipp Reisner } 4438b411b363SPhilipp Reisner put_ldev(mdev); 4439b411b363SPhilipp Reisner } 4440b411b363SPhilipp Reisner 444181e84650SAndreas Gruenbacher return true; 4442b411b363SPhilipp Reisner } 4443b411b363SPhilipp Reisner 4444d8763023SAndreas Gruenbacher static int got_BarrierAck(struct drbd_conf *mdev, enum drbd_packet cmd) 4445b411b363SPhilipp Reisner { 4446257d0af6SPhilipp Reisner struct p_barrier_ack *p = &mdev->tconn->meta.rbuf.barrier_ack; 4447b411b363SPhilipp Reisner 4448b411b363SPhilipp Reisner tl_release(mdev, p->barrier, be32_to_cpu(p->set_size)); 4449b411b363SPhilipp Reisner 4450c4752ef1SPhilipp Reisner if (mdev->state.conn == C_AHEAD && 4451c4752ef1SPhilipp Reisner atomic_read(&mdev->ap_in_flight) == 0 && 4452370a43e7SPhilipp Reisner !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &mdev->current_epoch->flags)) { 4453370a43e7SPhilipp Reisner mdev->start_resync_timer.expires = jiffies + HZ; 4454370a43e7SPhilipp Reisner add_timer(&mdev->start_resync_timer); 4455c4752ef1SPhilipp Reisner } 4456c4752ef1SPhilipp Reisner 445781e84650SAndreas Gruenbacher return true; 4458b411b363SPhilipp Reisner } 4459b411b363SPhilipp Reisner 4460d8763023SAndreas Gruenbacher static int got_OVResult(struct drbd_conf *mdev, enum drbd_packet cmd) 4461b411b363SPhilipp Reisner { 4462257d0af6SPhilipp Reisner struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack; 4463b411b363SPhilipp Reisner struct drbd_work *w; 4464b411b363SPhilipp Reisner sector_t sector; 4465b411b363SPhilipp Reisner int size; 4466b411b363SPhilipp Reisner 4467b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4468b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4469b411b363SPhilipp Reisner 4470b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4471b411b363SPhilipp Reisner 4472b411b363SPhilipp Reisner if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) 4473b411b363SPhilipp Reisner drbd_ov_oos_found(mdev, sector, size); 4474b411b363SPhilipp Reisner else 4475b411b363SPhilipp Reisner ov_oos_print(mdev); 4476b411b363SPhilipp Reisner 44771d53f09eSLars Ellenberg if (!get_ldev(mdev)) 447881e84650SAndreas Gruenbacher return true; 44791d53f09eSLars Ellenberg 4480b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4481b411b363SPhilipp Reisner dec_rs_pending(mdev); 4482b411b363SPhilipp Reisner 4483ea5442afSLars Ellenberg --mdev->ov_left; 4484ea5442afSLars Ellenberg 4485ea5442afSLars Ellenberg /* let's advance progress step marks only for every other megabyte */ 4486ea5442afSLars Ellenberg if ((mdev->ov_left & 0x200) == 0x200) 4487ea5442afSLars Ellenberg drbd_advance_rs_marks(mdev, mdev->ov_left); 4488ea5442afSLars Ellenberg 4489ea5442afSLars Ellenberg if (mdev->ov_left == 0) { 4490b411b363SPhilipp Reisner w = kmalloc(sizeof(*w), GFP_NOIO); 4491b411b363SPhilipp Reisner if (w) { 4492b411b363SPhilipp Reisner w->cb = w_ov_finished; 4493e42325a5SPhilipp Reisner drbd_queue_work_front(&mdev->tconn->data.work, w); 4494b411b363SPhilipp Reisner } else { 4495b411b363SPhilipp Reisner dev_err(DEV, "kmalloc(w) failed."); 4496b411b363SPhilipp Reisner ov_oos_print(mdev); 4497b411b363SPhilipp Reisner drbd_resync_finished(mdev); 4498b411b363SPhilipp Reisner } 4499b411b363SPhilipp Reisner } 45001d53f09eSLars Ellenberg put_ldev(mdev); 450181e84650SAndreas Gruenbacher return true; 4502b411b363SPhilipp Reisner } 4503b411b363SPhilipp Reisner 4504d8763023SAndreas Gruenbacher static int got_skip(struct drbd_conf *mdev, enum drbd_packet cmd) 45050ced55a3SPhilipp Reisner { 450681e84650SAndreas Gruenbacher return true; 45070ced55a3SPhilipp Reisner } 45080ced55a3SPhilipp Reisner 4509b411b363SPhilipp Reisner struct asender_cmd { 4510b411b363SPhilipp Reisner size_t pkt_size; 4511d8763023SAndreas Gruenbacher int (*process)(struct drbd_conf *mdev, enum drbd_packet cmd); 4512b411b363SPhilipp Reisner }; 4513b411b363SPhilipp Reisner 4514b411b363SPhilipp Reisner static struct asender_cmd *get_asender_cmd(int cmd) 4515b411b363SPhilipp Reisner { 4516b411b363SPhilipp Reisner static struct asender_cmd asender_tbl[] = { 4517b411b363SPhilipp Reisner /* anything missing from this table is in 4518b411b363SPhilipp Reisner * the drbd_cmd_handler (drbd_default_handler) table, 4519b411b363SPhilipp Reisner * see the beginning of drbdd() */ 4520257d0af6SPhilipp Reisner [P_PING] = { sizeof(struct p_header), got_Ping }, 4521257d0af6SPhilipp Reisner [P_PING_ACK] = { sizeof(struct p_header), got_PingAck }, 4522b411b363SPhilipp Reisner [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4523b411b363SPhilipp Reisner [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4524b411b363SPhilipp Reisner [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4525b411b363SPhilipp Reisner [P_DISCARD_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4526b411b363SPhilipp Reisner [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, 4527b411b363SPhilipp Reisner [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, 4528b411b363SPhilipp Reisner [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply}, 4529b411b363SPhilipp Reisner [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, 4530b411b363SPhilipp Reisner [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, 4531b411b363SPhilipp Reisner [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, 4532b411b363SPhilipp Reisner [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, 453302918be2SPhilipp Reisner [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip }, 4534d612d309SPhilipp Reisner [P_RS_CANCEL] = { sizeof(struct p_block_ack), got_NegRSDReply}, 4535b411b363SPhilipp Reisner [P_MAX_CMD] = { 0, NULL }, 4536b411b363SPhilipp Reisner }; 4537b411b363SPhilipp Reisner if (cmd > P_MAX_CMD || asender_tbl[cmd].process == NULL) 4538b411b363SPhilipp Reisner return NULL; 4539b411b363SPhilipp Reisner return &asender_tbl[cmd]; 4540b411b363SPhilipp Reisner } 4541b411b363SPhilipp Reisner 4542b411b363SPhilipp Reisner int drbd_asender(struct drbd_thread *thi) 4543b411b363SPhilipp Reisner { 4544b411b363SPhilipp Reisner struct drbd_conf *mdev = thi->mdev; 4545257d0af6SPhilipp Reisner struct p_header *h = &mdev->tconn->meta.rbuf.header; 4546b411b363SPhilipp Reisner struct asender_cmd *cmd = NULL; 4547b411b363SPhilipp Reisner 4548257d0af6SPhilipp Reisner int rv; 4549b411b363SPhilipp Reisner void *buf = h; 4550b411b363SPhilipp Reisner int received = 0; 4551257d0af6SPhilipp Reisner int expect = sizeof(struct p_header); 4552f36af18cSLars Ellenberg int ping_timeout_active = 0; 4553257d0af6SPhilipp Reisner int empty, pkt_size; 4554d8763023SAndreas Gruenbacher enum drbd_packet cmd_nr; 4555b411b363SPhilipp Reisner 4556b411b363SPhilipp Reisner sprintf(current->comm, "drbd%d_asender", mdev_to_minor(mdev)); 4557b411b363SPhilipp Reisner 4558b411b363SPhilipp Reisner current->policy = SCHED_RR; /* Make this a realtime task! */ 4559b411b363SPhilipp Reisner current->rt_priority = 2; /* more important than all other tasks */ 4560b411b363SPhilipp Reisner 4561e77a0a5cSAndreas Gruenbacher while (get_t_state(thi) == RUNNING) { 4562bc31fe33SPhilipp Reisner drbd_thread_current_set_cpu(mdev, thi); 4563e43ef195SPhilipp Reisner if (test_and_clear_bit(SEND_PING, &mdev->tconn->flags)) { 4564841ce241SAndreas Gruenbacher if (!drbd_send_ping(mdev)) { 4565841ce241SAndreas Gruenbacher dev_err(DEV, "drbd_send_ping has failed\n"); 4566841ce241SAndreas Gruenbacher goto reconnect; 4567841ce241SAndreas Gruenbacher } 4568e42325a5SPhilipp Reisner mdev->tconn->meta.socket->sk->sk_rcvtimeo = 456989e58e75SPhilipp Reisner mdev->tconn->net_conf->ping_timeo*HZ/10; 4570f36af18cSLars Ellenberg ping_timeout_active = 1; 4571b411b363SPhilipp Reisner } 4572b411b363SPhilipp Reisner 4573b411b363SPhilipp Reisner /* conditionally cork; 4574b411b363SPhilipp Reisner * it may hurt latency if we cork without much to send */ 457589e58e75SPhilipp Reisner if (!mdev->tconn->net_conf->no_cork && 4576b411b363SPhilipp Reisner 3 < atomic_read(&mdev->unacked_cnt)) 4577e42325a5SPhilipp Reisner drbd_tcp_cork(mdev->tconn->meta.socket); 4578b411b363SPhilipp Reisner while (1) { 4579808e37b8SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &mdev->tconn->flags); 4580b411b363SPhilipp Reisner flush_signals(current); 45810f8488e1SLars Ellenberg if (!drbd_process_done_ee(mdev)) 4582b411b363SPhilipp Reisner goto reconnect; 4583b411b363SPhilipp Reisner /* to avoid race with newly queued ACKs */ 4584808e37b8SPhilipp Reisner set_bit(SIGNAL_ASENDER, &mdev->tconn->flags); 458587eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 4586b411b363SPhilipp Reisner empty = list_empty(&mdev->done_ee); 458787eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 4588b411b363SPhilipp Reisner /* new ack may have been queued right here, 4589b411b363SPhilipp Reisner * but then there is also a signal pending, 4590b411b363SPhilipp Reisner * and we start over... */ 4591b411b363SPhilipp Reisner if (empty) 4592b411b363SPhilipp Reisner break; 4593b411b363SPhilipp Reisner } 4594b411b363SPhilipp Reisner /* but unconditionally uncork unless disabled */ 459589e58e75SPhilipp Reisner if (!mdev->tconn->net_conf->no_cork) 4596e42325a5SPhilipp Reisner drbd_tcp_uncork(mdev->tconn->meta.socket); 4597b411b363SPhilipp Reisner 4598b411b363SPhilipp Reisner /* short circuit, recv_msg would return EINTR anyways. */ 4599b411b363SPhilipp Reisner if (signal_pending(current)) 4600b411b363SPhilipp Reisner continue; 4601b411b363SPhilipp Reisner 4602dbd9eea0SPhilipp Reisner rv = drbd_recv_short(mdev->tconn->meta.socket, buf, expect-received, 0); 4603808e37b8SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &mdev->tconn->flags); 4604b411b363SPhilipp Reisner 4605b411b363SPhilipp Reisner flush_signals(current); 4606b411b363SPhilipp Reisner 4607b411b363SPhilipp Reisner /* Note: 4608b411b363SPhilipp Reisner * -EINTR (on meta) we got a signal 4609b411b363SPhilipp Reisner * -EAGAIN (on meta) rcvtimeo expired 4610b411b363SPhilipp Reisner * -ECONNRESET other side closed the connection 4611b411b363SPhilipp Reisner * -ERESTARTSYS (on data) we got a signal 4612b411b363SPhilipp Reisner * rv < 0 other than above: unexpected error! 4613b411b363SPhilipp Reisner * rv == expected: full header or command 4614b411b363SPhilipp Reisner * rv < expected: "woken" by signal during receive 4615b411b363SPhilipp Reisner * rv == 0 : "connection shut down by peer" 4616b411b363SPhilipp Reisner */ 4617b411b363SPhilipp Reisner if (likely(rv > 0)) { 4618b411b363SPhilipp Reisner received += rv; 4619b411b363SPhilipp Reisner buf += rv; 4620b411b363SPhilipp Reisner } else if (rv == 0) { 4621b411b363SPhilipp Reisner dev_err(DEV, "meta connection shut down by peer.\n"); 4622b411b363SPhilipp Reisner goto reconnect; 4623b411b363SPhilipp Reisner } else if (rv == -EAGAIN) { 4624cb6518cbSLars Ellenberg /* If the data socket received something meanwhile, 4625cb6518cbSLars Ellenberg * that is good enough: peer is still alive. */ 462631890f4aSPhilipp Reisner if (time_after(mdev->tconn->last_received, 4627e42325a5SPhilipp Reisner jiffies - mdev->tconn->meta.socket->sk->sk_rcvtimeo)) 4628cb6518cbSLars Ellenberg continue; 4629f36af18cSLars Ellenberg if (ping_timeout_active) { 4630b411b363SPhilipp Reisner dev_err(DEV, "PingAck did not arrive in time.\n"); 4631b411b363SPhilipp Reisner goto reconnect; 4632b411b363SPhilipp Reisner } 4633e43ef195SPhilipp Reisner set_bit(SEND_PING, &mdev->tconn->flags); 4634b411b363SPhilipp Reisner continue; 4635b411b363SPhilipp Reisner } else if (rv == -EINTR) { 4636b411b363SPhilipp Reisner continue; 4637b411b363SPhilipp Reisner } else { 4638b411b363SPhilipp Reisner dev_err(DEV, "sock_recvmsg returned %d\n", rv); 4639b411b363SPhilipp Reisner goto reconnect; 4640b411b363SPhilipp Reisner } 4641b411b363SPhilipp Reisner 4642b411b363SPhilipp Reisner if (received == expect && cmd == NULL) { 4643257d0af6SPhilipp Reisner if (!decode_header(mdev, h, &cmd_nr, &pkt_size)) 4644b411b363SPhilipp Reisner goto reconnect; 4645257d0af6SPhilipp Reisner cmd = get_asender_cmd(cmd_nr); 4646b411b363SPhilipp Reisner if (unlikely(cmd == NULL)) { 4647257d0af6SPhilipp Reisner dev_err(DEV, "unknown command %d on meta (l: %d)\n", 4648257d0af6SPhilipp Reisner cmd_nr, pkt_size); 4649b411b363SPhilipp Reisner goto disconnect; 4650b411b363SPhilipp Reisner } 4651b411b363SPhilipp Reisner expect = cmd->pkt_size; 4652257d0af6SPhilipp Reisner if (pkt_size != expect - sizeof(struct p_header)) { 4653257d0af6SPhilipp Reisner dev_err(DEV, "Wrong packet size on meta (c: %d, l: %d)\n", 4654257d0af6SPhilipp Reisner cmd_nr, pkt_size); 4655b411b363SPhilipp Reisner goto reconnect; 4656b411b363SPhilipp Reisner } 4657257d0af6SPhilipp Reisner } 4658b411b363SPhilipp Reisner if (received == expect) { 465931890f4aSPhilipp Reisner mdev->tconn->last_received = jiffies; 4660b411b363SPhilipp Reisner D_ASSERT(cmd != NULL); 4661257d0af6SPhilipp Reisner if (!cmd->process(mdev, cmd_nr)) 4662b411b363SPhilipp Reisner goto reconnect; 4663b411b363SPhilipp Reisner 4664f36af18cSLars Ellenberg /* the idle_timeout (ping-int) 4665f36af18cSLars Ellenberg * has been restored in got_PingAck() */ 4666f36af18cSLars Ellenberg if (cmd == get_asender_cmd(P_PING_ACK)) 4667f36af18cSLars Ellenberg ping_timeout_active = 0; 4668f36af18cSLars Ellenberg 4669b411b363SPhilipp Reisner buf = h; 4670b411b363SPhilipp Reisner received = 0; 4671257d0af6SPhilipp Reisner expect = sizeof(struct p_header); 4672b411b363SPhilipp Reisner cmd = NULL; 4673b411b363SPhilipp Reisner } 4674b411b363SPhilipp Reisner } 4675b411b363SPhilipp Reisner 4676b411b363SPhilipp Reisner if (0) { 4677b411b363SPhilipp Reisner reconnect: 4678b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE)); 4679856c50c7SLars Ellenberg drbd_md_sync(mdev); 4680b411b363SPhilipp Reisner } 4681b411b363SPhilipp Reisner if (0) { 4682b411b363SPhilipp Reisner disconnect: 4683b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 4684856c50c7SLars Ellenberg drbd_md_sync(mdev); 4685b411b363SPhilipp Reisner } 4686808e37b8SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &mdev->tconn->flags); 4687b411b363SPhilipp Reisner 4688b411b363SPhilipp Reisner D_ASSERT(mdev->state.conn < C_CONNECTED); 4689b411b363SPhilipp Reisner dev_info(DEV, "asender terminated\n"); 4690b411b363SPhilipp Reisner 4691b411b363SPhilipp Reisner return 0; 4692b411b363SPhilipp Reisner } 4693