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 { 192f6ffca9fSAndreas Gruenbacher struct drbd_peer_request *e; 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) { 201f6ffca9fSAndreas Gruenbacher e = list_entry(le, struct drbd_peer_request, w.list); 20245bb912bSLars Ellenberg if (drbd_ee_has_active_page(e)) 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); 211f6ffca9fSAndreas Gruenbacher struct drbd_peer_request *e, *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 217b411b363SPhilipp Reisner list_for_each_entry_safe(e, t, &reclaimed, w.list) 218435f0740SLars Ellenberg drbd_free_net_ee(mdev, e); 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 { 316f6ffca9fSAndreas Gruenbacher struct drbd_peer_request *e; 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 323b411b363SPhilipp Reisner e = mempool_alloc(drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM); 324b411b363SPhilipp Reisner if (!e) { 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 3348b946255SAndreas Gruenbacher drbd_clear_interval(&e->i); 33553840641SAndreas Gruenbacher e->i.size = data_size; 33653840641SAndreas Gruenbacher e->i.sector = sector; 3375e472264SAndreas Gruenbacher e->i.local = false; 33853840641SAndreas Gruenbacher e->i.waiting = false; 33953840641SAndreas Gruenbacher 340b411b363SPhilipp Reisner e->epoch = NULL; 34145bb912bSLars Ellenberg e->mdev = mdev; 34245bb912bSLars Ellenberg e->pages = page; 34345bb912bSLars Ellenberg atomic_set(&e->pending_bios, 0); 344b411b363SPhilipp Reisner e->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 */ 34945bb912bSLars Ellenberg e->block_id = id; 350b411b363SPhilipp Reisner 351b411b363SPhilipp Reisner return e; 352b411b363SPhilipp Reisner 35345bb912bSLars Ellenberg fail: 354b411b363SPhilipp Reisner mempool_free(e, drbd_ee_mempool); 355b411b363SPhilipp Reisner return NULL; 356b411b363SPhilipp Reisner } 357b411b363SPhilipp Reisner 358f6ffca9fSAndreas Gruenbacher void drbd_free_some_ee(struct drbd_conf *mdev, struct drbd_peer_request *e, 359f6ffca9fSAndreas Gruenbacher int is_net) 360b411b363SPhilipp Reisner { 361c36c3cedSLars Ellenberg if (e->flags & EE_HAS_DIGEST) 362c36c3cedSLars Ellenberg kfree(e->digest); 363435f0740SLars Ellenberg drbd_pp_free(mdev, e->pages, is_net); 36445bb912bSLars Ellenberg D_ASSERT(atomic_read(&e->pending_bios) == 0); 3658b946255SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&e->i)); 366b411b363SPhilipp Reisner mempool_free(e, 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); 372f6ffca9fSAndreas Gruenbacher struct drbd_peer_request *e, *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 380b411b363SPhilipp Reisner list_for_each_entry_safe(e, t, &work_list, w.list) { 381435f0740SLars Ellenberg drbd_free_some_ee(mdev, e, 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); 401f6ffca9fSAndreas Gruenbacher struct drbd_peer_request *e, *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 409b411b363SPhilipp Reisner list_for_each_entry_safe(e, t, &reclaimed, w.list) 410435f0740SLars Ellenberg drbd_free_net_ee(mdev, e); 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 */ 416b411b363SPhilipp Reisner list_for_each_entry_safe(e, t, &work_list, w.list) { 417b411b363SPhilipp Reisner /* list_del not necessary, next/prev members not touched */ 418b411b363SPhilipp Reisner ok = e->w.cb(mdev, &e->w, !ok) && ok; 419b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 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 */ 450b411b363SPhilipp Reisner static int drbd_accept(struct drbd_conf *mdev, const char **what, 451b411b363SPhilipp Reisner struct socket *sock, struct socket **newsock) 452b411b363SPhilipp Reisner { 453b411b363SPhilipp Reisner struct sock *sk = sock->sk; 454b411b363SPhilipp Reisner int err = 0; 455b411b363SPhilipp Reisner 456b411b363SPhilipp Reisner *what = "listen"; 457b411b363SPhilipp Reisner err = sock->ops->listen(sock, 5); 458b411b363SPhilipp Reisner if (err < 0) 459b411b363SPhilipp Reisner goto out; 460b411b363SPhilipp Reisner 461b411b363SPhilipp Reisner *what = "sock_create_lite"; 462b411b363SPhilipp Reisner err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, 463b411b363SPhilipp Reisner newsock); 464b411b363SPhilipp Reisner if (err < 0) 465b411b363SPhilipp Reisner goto out; 466b411b363SPhilipp Reisner 467b411b363SPhilipp Reisner *what = "accept"; 468b411b363SPhilipp Reisner err = sock->ops->accept(sock, *newsock, 0); 469b411b363SPhilipp Reisner if (err < 0) { 470b411b363SPhilipp Reisner sock_release(*newsock); 471b411b363SPhilipp Reisner *newsock = NULL; 472b411b363SPhilipp Reisner goto out; 473b411b363SPhilipp Reisner } 474b411b363SPhilipp Reisner (*newsock)->ops = sock->ops; 475b411b363SPhilipp Reisner 476b411b363SPhilipp Reisner out: 477b411b363SPhilipp Reisner return err; 478b411b363SPhilipp Reisner } 479b411b363SPhilipp Reisner 480b411b363SPhilipp Reisner static int drbd_recv_short(struct drbd_conf *mdev, struct socket *sock, 481b411b363SPhilipp Reisner void *buf, size_t size, int flags) 482b411b363SPhilipp Reisner { 483b411b363SPhilipp Reisner mm_segment_t oldfs; 484b411b363SPhilipp Reisner struct kvec iov = { 485b411b363SPhilipp Reisner .iov_base = buf, 486b411b363SPhilipp Reisner .iov_len = size, 487b411b363SPhilipp Reisner }; 488b411b363SPhilipp Reisner struct msghdr msg = { 489b411b363SPhilipp Reisner .msg_iovlen = 1, 490b411b363SPhilipp Reisner .msg_iov = (struct iovec *)&iov, 491b411b363SPhilipp Reisner .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) 492b411b363SPhilipp Reisner }; 493b411b363SPhilipp Reisner int rv; 494b411b363SPhilipp Reisner 495b411b363SPhilipp Reisner oldfs = get_fs(); 496b411b363SPhilipp Reisner set_fs(KERNEL_DS); 497b411b363SPhilipp Reisner rv = sock_recvmsg(sock, &msg, size, msg.msg_flags); 498b411b363SPhilipp Reisner set_fs(oldfs); 499b411b363SPhilipp Reisner 500b411b363SPhilipp Reisner return rv; 501b411b363SPhilipp Reisner } 502b411b363SPhilipp Reisner 503b411b363SPhilipp Reisner static int drbd_recv(struct drbd_conf *mdev, void *buf, size_t size) 504b411b363SPhilipp Reisner { 505b411b363SPhilipp Reisner mm_segment_t oldfs; 506b411b363SPhilipp Reisner struct kvec iov = { 507b411b363SPhilipp Reisner .iov_base = buf, 508b411b363SPhilipp Reisner .iov_len = size, 509b411b363SPhilipp Reisner }; 510b411b363SPhilipp Reisner struct msghdr msg = { 511b411b363SPhilipp Reisner .msg_iovlen = 1, 512b411b363SPhilipp Reisner .msg_iov = (struct iovec *)&iov, 513b411b363SPhilipp Reisner .msg_flags = MSG_WAITALL | MSG_NOSIGNAL 514b411b363SPhilipp Reisner }; 515b411b363SPhilipp Reisner int rv; 516b411b363SPhilipp Reisner 517b411b363SPhilipp Reisner oldfs = get_fs(); 518b411b363SPhilipp Reisner set_fs(KERNEL_DS); 519b411b363SPhilipp Reisner 520b411b363SPhilipp Reisner for (;;) { 521e42325a5SPhilipp Reisner rv = sock_recvmsg(mdev->tconn->data.socket, &msg, size, msg.msg_flags); 522b411b363SPhilipp Reisner if (rv == size) 523b411b363SPhilipp Reisner break; 524b411b363SPhilipp Reisner 525b411b363SPhilipp Reisner /* Note: 526b411b363SPhilipp Reisner * ECONNRESET other side closed the connection 527b411b363SPhilipp Reisner * ERESTARTSYS (on sock) we got a signal 528b411b363SPhilipp Reisner */ 529b411b363SPhilipp Reisner 530b411b363SPhilipp Reisner if (rv < 0) { 531b411b363SPhilipp Reisner if (rv == -ECONNRESET) 532b411b363SPhilipp Reisner dev_info(DEV, "sock was reset by peer\n"); 533b411b363SPhilipp Reisner else if (rv != -ERESTARTSYS) 534b411b363SPhilipp Reisner dev_err(DEV, "sock_recvmsg returned %d\n", rv); 535b411b363SPhilipp Reisner break; 536b411b363SPhilipp Reisner } else if (rv == 0) { 537b411b363SPhilipp Reisner dev_info(DEV, "sock was shut down by peer\n"); 538b411b363SPhilipp Reisner break; 539b411b363SPhilipp Reisner } else { 540b411b363SPhilipp Reisner /* signal came in, or peer/link went down, 541b411b363SPhilipp Reisner * after we read a partial message 542b411b363SPhilipp Reisner */ 543b411b363SPhilipp Reisner /* D_ASSERT(signal_pending(current)); */ 544b411b363SPhilipp Reisner break; 545b411b363SPhilipp Reisner } 546b411b363SPhilipp Reisner }; 547b411b363SPhilipp Reisner 548b411b363SPhilipp Reisner set_fs(oldfs); 549b411b363SPhilipp Reisner 550b411b363SPhilipp Reisner if (rv != size) 551b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_BROKEN_PIPE)); 552b411b363SPhilipp Reisner 553b411b363SPhilipp Reisner return rv; 554b411b363SPhilipp Reisner } 555b411b363SPhilipp Reisner 5565dbf1673SLars Ellenberg /* quoting tcp(7): 5575dbf1673SLars Ellenberg * On individual connections, the socket buffer size must be set prior to the 5585dbf1673SLars Ellenberg * listen(2) or connect(2) calls in order to have it take effect. 5595dbf1673SLars Ellenberg * This is our wrapper to do so. 5605dbf1673SLars Ellenberg */ 5615dbf1673SLars Ellenberg static void drbd_setbufsize(struct socket *sock, unsigned int snd, 5625dbf1673SLars Ellenberg unsigned int rcv) 5635dbf1673SLars Ellenberg { 5645dbf1673SLars Ellenberg /* open coded SO_SNDBUF, SO_RCVBUF */ 5655dbf1673SLars Ellenberg if (snd) { 5665dbf1673SLars Ellenberg sock->sk->sk_sndbuf = snd; 5675dbf1673SLars Ellenberg sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 5685dbf1673SLars Ellenberg } 5695dbf1673SLars Ellenberg if (rcv) { 5705dbf1673SLars Ellenberg sock->sk->sk_rcvbuf = rcv; 5715dbf1673SLars Ellenberg sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 5725dbf1673SLars Ellenberg } 5735dbf1673SLars Ellenberg } 5745dbf1673SLars Ellenberg 575b411b363SPhilipp Reisner static struct socket *drbd_try_connect(struct drbd_conf *mdev) 576b411b363SPhilipp Reisner { 577b411b363SPhilipp Reisner const char *what; 578b411b363SPhilipp Reisner struct socket *sock; 579b411b363SPhilipp Reisner struct sockaddr_in6 src_in6; 580b411b363SPhilipp Reisner int err; 581b411b363SPhilipp Reisner int disconnect_on_error = 1; 582b411b363SPhilipp Reisner 583b2fb6dbeSPhilipp Reisner if (!get_net_conf(mdev->tconn)) 584b411b363SPhilipp Reisner return NULL; 585b411b363SPhilipp Reisner 586b411b363SPhilipp Reisner what = "sock_create_kern"; 58789e58e75SPhilipp Reisner err = sock_create_kern(((struct sockaddr *)mdev->tconn->net_conf->my_addr)->sa_family, 588b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &sock); 589b411b363SPhilipp Reisner if (err < 0) { 590b411b363SPhilipp Reisner sock = NULL; 591b411b363SPhilipp Reisner goto out; 592b411b363SPhilipp Reisner } 593b411b363SPhilipp Reisner 594b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = 59589e58e75SPhilipp Reisner sock->sk->sk_sndtimeo = mdev->tconn->net_conf->try_connect_int*HZ; 59689e58e75SPhilipp Reisner drbd_setbufsize(sock, mdev->tconn->net_conf->sndbuf_size, 59789e58e75SPhilipp Reisner mdev->tconn->net_conf->rcvbuf_size); 598b411b363SPhilipp Reisner 599b411b363SPhilipp Reisner /* explicitly bind to the configured IP as source IP 600b411b363SPhilipp Reisner * for the outgoing connections. 601b411b363SPhilipp Reisner * This is needed for multihomed hosts and to be 602b411b363SPhilipp Reisner * able to use lo: interfaces for drbd. 603b411b363SPhilipp Reisner * Make sure to use 0 as port number, so linux selects 604b411b363SPhilipp Reisner * a free one dynamically. 605b411b363SPhilipp Reisner */ 60689e58e75SPhilipp Reisner memcpy(&src_in6, mdev->tconn->net_conf->my_addr, 60789e58e75SPhilipp Reisner min_t(int, mdev->tconn->net_conf->my_addr_len, sizeof(src_in6))); 60889e58e75SPhilipp Reisner if (((struct sockaddr *)mdev->tconn->net_conf->my_addr)->sa_family == AF_INET6) 609b411b363SPhilipp Reisner src_in6.sin6_port = 0; 610b411b363SPhilipp Reisner else 611b411b363SPhilipp Reisner ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ 612b411b363SPhilipp Reisner 613b411b363SPhilipp Reisner what = "bind before connect"; 614b411b363SPhilipp Reisner err = sock->ops->bind(sock, 615b411b363SPhilipp Reisner (struct sockaddr *) &src_in6, 61689e58e75SPhilipp Reisner mdev->tconn->net_conf->my_addr_len); 617b411b363SPhilipp Reisner if (err < 0) 618b411b363SPhilipp Reisner goto out; 619b411b363SPhilipp Reisner 620b411b363SPhilipp Reisner /* connect may fail, peer not yet available. 621b411b363SPhilipp Reisner * stay C_WF_CONNECTION, don't go Disconnecting! */ 622b411b363SPhilipp Reisner disconnect_on_error = 0; 623b411b363SPhilipp Reisner what = "connect"; 624b411b363SPhilipp Reisner err = sock->ops->connect(sock, 62589e58e75SPhilipp Reisner (struct sockaddr *)mdev->tconn->net_conf->peer_addr, 62689e58e75SPhilipp Reisner mdev->tconn->net_conf->peer_addr_len, 0); 627b411b363SPhilipp Reisner 628b411b363SPhilipp Reisner out: 629b411b363SPhilipp Reisner if (err < 0) { 630b411b363SPhilipp Reisner if (sock) { 631b411b363SPhilipp Reisner sock_release(sock); 632b411b363SPhilipp Reisner sock = NULL; 633b411b363SPhilipp Reisner } 634b411b363SPhilipp Reisner switch (-err) { 635b411b363SPhilipp Reisner /* timeout, busy, signal pending */ 636b411b363SPhilipp Reisner case ETIMEDOUT: case EAGAIN: case EINPROGRESS: 637b411b363SPhilipp Reisner case EINTR: case ERESTARTSYS: 638b411b363SPhilipp Reisner /* peer not (yet) available, network problem */ 639b411b363SPhilipp Reisner case ECONNREFUSED: case ENETUNREACH: 640b411b363SPhilipp Reisner case EHOSTDOWN: case EHOSTUNREACH: 641b411b363SPhilipp Reisner disconnect_on_error = 0; 642b411b363SPhilipp Reisner break; 643b411b363SPhilipp Reisner default: 644b411b363SPhilipp Reisner dev_err(DEV, "%s failed, err = %d\n", what, err); 645b411b363SPhilipp Reisner } 646b411b363SPhilipp Reisner if (disconnect_on_error) 647b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 648b411b363SPhilipp Reisner } 649b2fb6dbeSPhilipp Reisner put_net_conf(mdev->tconn); 650b411b363SPhilipp Reisner return sock; 651b411b363SPhilipp Reisner } 652b411b363SPhilipp Reisner 653b411b363SPhilipp Reisner static struct socket *drbd_wait_for_connect(struct drbd_conf *mdev) 654b411b363SPhilipp Reisner { 655b411b363SPhilipp Reisner int timeo, err; 656b411b363SPhilipp Reisner struct socket *s_estab = NULL, *s_listen; 657b411b363SPhilipp Reisner const char *what; 658b411b363SPhilipp Reisner 659b2fb6dbeSPhilipp Reisner if (!get_net_conf(mdev->tconn)) 660b411b363SPhilipp Reisner return NULL; 661b411b363SPhilipp Reisner 662b411b363SPhilipp Reisner what = "sock_create_kern"; 66389e58e75SPhilipp Reisner err = sock_create_kern(((struct sockaddr *)mdev->tconn->net_conf->my_addr)->sa_family, 664b411b363SPhilipp Reisner SOCK_STREAM, IPPROTO_TCP, &s_listen); 665b411b363SPhilipp Reisner if (err) { 666b411b363SPhilipp Reisner s_listen = NULL; 667b411b363SPhilipp Reisner goto out; 668b411b363SPhilipp Reisner } 669b411b363SPhilipp Reisner 67089e58e75SPhilipp Reisner timeo = mdev->tconn->net_conf->try_connect_int * HZ; 671b411b363SPhilipp Reisner timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */ 672b411b363SPhilipp Reisner 673b411b363SPhilipp Reisner s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */ 674b411b363SPhilipp Reisner s_listen->sk->sk_rcvtimeo = timeo; 675b411b363SPhilipp Reisner s_listen->sk->sk_sndtimeo = timeo; 67689e58e75SPhilipp Reisner drbd_setbufsize(s_listen, mdev->tconn->net_conf->sndbuf_size, 67789e58e75SPhilipp Reisner mdev->tconn->net_conf->rcvbuf_size); 678b411b363SPhilipp Reisner 679b411b363SPhilipp Reisner what = "bind before listen"; 680b411b363SPhilipp Reisner err = s_listen->ops->bind(s_listen, 68189e58e75SPhilipp Reisner (struct sockaddr *) mdev->tconn->net_conf->my_addr, 68289e58e75SPhilipp Reisner mdev->tconn->net_conf->my_addr_len); 683b411b363SPhilipp Reisner if (err < 0) 684b411b363SPhilipp Reisner goto out; 685b411b363SPhilipp Reisner 686b411b363SPhilipp Reisner err = drbd_accept(mdev, &what, s_listen, &s_estab); 687b411b363SPhilipp Reisner 688b411b363SPhilipp Reisner out: 689b411b363SPhilipp Reisner if (s_listen) 690b411b363SPhilipp Reisner sock_release(s_listen); 691b411b363SPhilipp Reisner if (err < 0) { 692b411b363SPhilipp Reisner if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { 693b411b363SPhilipp Reisner dev_err(DEV, "%s failed, err = %d\n", what, err); 694b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 695b411b363SPhilipp Reisner } 696b411b363SPhilipp Reisner } 697b2fb6dbeSPhilipp Reisner put_net_conf(mdev->tconn); 698b411b363SPhilipp Reisner 699b411b363SPhilipp Reisner return s_estab; 700b411b363SPhilipp Reisner } 701b411b363SPhilipp Reisner 702d8763023SAndreas Gruenbacher static int drbd_send_fp(struct drbd_conf *mdev, struct socket *sock, 703d8763023SAndreas Gruenbacher enum drbd_packet cmd) 704b411b363SPhilipp Reisner { 705c012949aSPhilipp Reisner struct p_header *h = &mdev->tconn->data.sbuf.header; 706b411b363SPhilipp Reisner 707b411b363SPhilipp Reisner return _drbd_send_cmd(mdev, sock, cmd, h, sizeof(*h), 0); 708b411b363SPhilipp Reisner } 709b411b363SPhilipp Reisner 710d8763023SAndreas Gruenbacher static enum drbd_packet drbd_recv_fp(struct drbd_conf *mdev, 711d8763023SAndreas Gruenbacher struct socket *sock) 712b411b363SPhilipp Reisner { 713e42325a5SPhilipp Reisner struct p_header80 *h = &mdev->tconn->data.rbuf.header.h80; 714b411b363SPhilipp Reisner int rr; 715b411b363SPhilipp Reisner 716b411b363SPhilipp Reisner rr = drbd_recv_short(mdev, sock, h, sizeof(*h), 0); 717b411b363SPhilipp Reisner 718ca9bc12bSAndreas Gruenbacher if (rr == sizeof(*h) && h->magic == cpu_to_be32(DRBD_MAGIC)) 719b411b363SPhilipp Reisner return be16_to_cpu(h->command); 720b411b363SPhilipp Reisner 721b411b363SPhilipp Reisner return 0xffff; 722b411b363SPhilipp Reisner } 723b411b363SPhilipp Reisner 724b411b363SPhilipp Reisner /** 725b411b363SPhilipp Reisner * drbd_socket_okay() - Free the socket if its connection is not okay 726b411b363SPhilipp Reisner * @mdev: DRBD device. 727b411b363SPhilipp Reisner * @sock: pointer to the pointer to the socket. 728b411b363SPhilipp Reisner */ 729b411b363SPhilipp Reisner static int drbd_socket_okay(struct drbd_conf *mdev, struct socket **sock) 730b411b363SPhilipp Reisner { 731b411b363SPhilipp Reisner int rr; 732b411b363SPhilipp Reisner char tb[4]; 733b411b363SPhilipp Reisner 734b411b363SPhilipp Reisner if (!*sock) 73581e84650SAndreas Gruenbacher return false; 736b411b363SPhilipp Reisner 737b411b363SPhilipp Reisner rr = drbd_recv_short(mdev, *sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); 738b411b363SPhilipp Reisner 739b411b363SPhilipp Reisner if (rr > 0 || rr == -EAGAIN) { 74081e84650SAndreas Gruenbacher return true; 741b411b363SPhilipp Reisner } else { 742b411b363SPhilipp Reisner sock_release(*sock); 743b411b363SPhilipp Reisner *sock = NULL; 74481e84650SAndreas Gruenbacher return false; 745b411b363SPhilipp Reisner } 746b411b363SPhilipp Reisner } 747b411b363SPhilipp Reisner 748b411b363SPhilipp Reisner /* 749b411b363SPhilipp Reisner * return values: 750b411b363SPhilipp Reisner * 1 yes, we have a valid connection 751b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 752b411b363SPhilipp Reisner * -1 peer talks different language, 753b411b363SPhilipp Reisner * no point in trying again, please go standalone. 754b411b363SPhilipp Reisner * -2 We do not have a network config... 755b411b363SPhilipp Reisner */ 756b411b363SPhilipp Reisner static int drbd_connect(struct drbd_conf *mdev) 757b411b363SPhilipp Reisner { 758b411b363SPhilipp Reisner struct socket *s, *sock, *msock; 759b411b363SPhilipp Reisner int try, h, ok; 760b411b363SPhilipp Reisner 761e42325a5SPhilipp Reisner D_ASSERT(!mdev->tconn->data.socket); 762b411b363SPhilipp Reisner 763b411b363SPhilipp Reisner if (drbd_request_state(mdev, NS(conn, C_WF_CONNECTION)) < SS_SUCCESS) 764b411b363SPhilipp Reisner return -2; 765b411b363SPhilipp Reisner 766b411b363SPhilipp Reisner clear_bit(DISCARD_CONCURRENT, &mdev->flags); 767fd340c12SPhilipp Reisner mdev->tconn->agreed_pro_version = 99; 768fd340c12SPhilipp Reisner /* agreed_pro_version must be smaller than 100 so we send the old 769fd340c12SPhilipp Reisner header (h80) in the first packet and in the handshake packet. */ 770b411b363SPhilipp Reisner 771b411b363SPhilipp Reisner sock = NULL; 772b411b363SPhilipp Reisner msock = NULL; 773b411b363SPhilipp Reisner 774b411b363SPhilipp Reisner do { 775b411b363SPhilipp Reisner for (try = 0;;) { 776b411b363SPhilipp Reisner /* 3 tries, this should take less than a second! */ 777b411b363SPhilipp Reisner s = drbd_try_connect(mdev); 778b411b363SPhilipp Reisner if (s || ++try >= 3) 779b411b363SPhilipp Reisner break; 780b411b363SPhilipp Reisner /* give the other side time to call bind() & listen() */ 78120ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ / 10); 782b411b363SPhilipp Reisner } 783b411b363SPhilipp Reisner 784b411b363SPhilipp Reisner if (s) { 785b411b363SPhilipp Reisner if (!sock) { 786b411b363SPhilipp Reisner drbd_send_fp(mdev, s, P_HAND_SHAKE_S); 787b411b363SPhilipp Reisner sock = s; 788b411b363SPhilipp Reisner s = NULL; 789b411b363SPhilipp Reisner } else if (!msock) { 790b411b363SPhilipp Reisner drbd_send_fp(mdev, s, P_HAND_SHAKE_M); 791b411b363SPhilipp Reisner msock = s; 792b411b363SPhilipp Reisner s = NULL; 793b411b363SPhilipp Reisner } else { 794b411b363SPhilipp Reisner dev_err(DEV, "Logic error in drbd_connect()\n"); 795b411b363SPhilipp Reisner goto out_release_sockets; 796b411b363SPhilipp Reisner } 797b411b363SPhilipp Reisner } 798b411b363SPhilipp Reisner 799b411b363SPhilipp Reisner if (sock && msock) { 80089e58e75SPhilipp Reisner schedule_timeout_interruptible(mdev->tconn->net_conf->ping_timeo*HZ/10); 801b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &sock); 802b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &msock) && ok; 803b411b363SPhilipp Reisner if (ok) 804b411b363SPhilipp Reisner break; 805b411b363SPhilipp Reisner } 806b411b363SPhilipp Reisner 807b411b363SPhilipp Reisner retry: 808b411b363SPhilipp Reisner s = drbd_wait_for_connect(mdev); 809b411b363SPhilipp Reisner if (s) { 810b411b363SPhilipp Reisner try = drbd_recv_fp(mdev, s); 811b411b363SPhilipp Reisner drbd_socket_okay(mdev, &sock); 812b411b363SPhilipp Reisner drbd_socket_okay(mdev, &msock); 813b411b363SPhilipp Reisner switch (try) { 814b411b363SPhilipp Reisner case P_HAND_SHAKE_S: 815b411b363SPhilipp Reisner if (sock) { 816b411b363SPhilipp Reisner dev_warn(DEV, "initial packet S crossed\n"); 817b411b363SPhilipp Reisner sock_release(sock); 818b411b363SPhilipp Reisner } 819b411b363SPhilipp Reisner sock = s; 820b411b363SPhilipp Reisner break; 821b411b363SPhilipp Reisner case P_HAND_SHAKE_M: 822b411b363SPhilipp Reisner if (msock) { 823b411b363SPhilipp Reisner dev_warn(DEV, "initial packet M crossed\n"); 824b411b363SPhilipp Reisner sock_release(msock); 825b411b363SPhilipp Reisner } 826b411b363SPhilipp Reisner msock = s; 827b411b363SPhilipp Reisner set_bit(DISCARD_CONCURRENT, &mdev->flags); 828b411b363SPhilipp Reisner break; 829b411b363SPhilipp Reisner default: 830b411b363SPhilipp Reisner dev_warn(DEV, "Error receiving initial packet\n"); 831b411b363SPhilipp Reisner sock_release(s); 832b411b363SPhilipp Reisner if (random32() & 1) 833b411b363SPhilipp Reisner goto retry; 834b411b363SPhilipp Reisner } 835b411b363SPhilipp Reisner } 836b411b363SPhilipp Reisner 837b411b363SPhilipp Reisner if (mdev->state.conn <= C_DISCONNECTING) 838b411b363SPhilipp Reisner goto out_release_sockets; 839b411b363SPhilipp Reisner if (signal_pending(current)) { 840b411b363SPhilipp Reisner flush_signals(current); 841b411b363SPhilipp Reisner smp_rmb(); 842e6b3ea83SPhilipp Reisner if (get_t_state(&mdev->tconn->receiver) == EXITING) 843b411b363SPhilipp Reisner goto out_release_sockets; 844b411b363SPhilipp Reisner } 845b411b363SPhilipp Reisner 846b411b363SPhilipp Reisner if (sock && msock) { 847b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &sock); 848b411b363SPhilipp Reisner ok = drbd_socket_okay(mdev, &msock) && ok; 849b411b363SPhilipp Reisner if (ok) 850b411b363SPhilipp Reisner break; 851b411b363SPhilipp Reisner } 852b411b363SPhilipp Reisner } while (1); 853b411b363SPhilipp Reisner 854b411b363SPhilipp Reisner msock->sk->sk_reuse = 1; /* SO_REUSEADDR */ 855b411b363SPhilipp Reisner sock->sk->sk_reuse = 1; /* SO_REUSEADDR */ 856b411b363SPhilipp Reisner 857b411b363SPhilipp Reisner sock->sk->sk_allocation = GFP_NOIO; 858b411b363SPhilipp Reisner msock->sk->sk_allocation = GFP_NOIO; 859b411b363SPhilipp Reisner 860b411b363SPhilipp Reisner sock->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; 861b411b363SPhilipp Reisner msock->sk->sk_priority = TC_PRIO_INTERACTIVE; 862b411b363SPhilipp Reisner 863b411b363SPhilipp Reisner /* NOT YET ... 86489e58e75SPhilipp Reisner * sock->sk->sk_sndtimeo = mdev->tconn->net_conf->timeout*HZ/10; 865b411b363SPhilipp Reisner * sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 866b411b363SPhilipp Reisner * first set it to the P_HAND_SHAKE timeout, 867b411b363SPhilipp Reisner * which we set to 4x the configured ping_timeout. */ 868b411b363SPhilipp Reisner sock->sk->sk_sndtimeo = 86989e58e75SPhilipp Reisner sock->sk->sk_rcvtimeo = mdev->tconn->net_conf->ping_timeo*4*HZ/10; 870b411b363SPhilipp Reisner 87189e58e75SPhilipp Reisner msock->sk->sk_sndtimeo = mdev->tconn->net_conf->timeout*HZ/10; 87289e58e75SPhilipp Reisner msock->sk->sk_rcvtimeo = mdev->tconn->net_conf->ping_int*HZ; 873b411b363SPhilipp Reisner 874b411b363SPhilipp Reisner /* we don't want delays. 87525985edcSLucas De Marchi * we use TCP_CORK where appropriate, though */ 876b411b363SPhilipp Reisner drbd_tcp_nodelay(sock); 877b411b363SPhilipp Reisner drbd_tcp_nodelay(msock); 878b411b363SPhilipp Reisner 879e42325a5SPhilipp Reisner mdev->tconn->data.socket = sock; 880e42325a5SPhilipp Reisner mdev->tconn->meta.socket = msock; 88131890f4aSPhilipp Reisner mdev->tconn->last_received = jiffies; 882b411b363SPhilipp Reisner 883e6b3ea83SPhilipp Reisner D_ASSERT(mdev->tconn->asender.task == NULL); 884b411b363SPhilipp Reisner 885b411b363SPhilipp Reisner h = drbd_do_handshake(mdev); 886b411b363SPhilipp Reisner if (h <= 0) 887b411b363SPhilipp Reisner return h; 888b411b363SPhilipp Reisner 889a0638456SPhilipp Reisner if (mdev->tconn->cram_hmac_tfm) { 890b411b363SPhilipp Reisner /* drbd_request_state(mdev, NS(conn, WFAuth)); */ 891b10d96cbSJohannes Thoma switch (drbd_do_auth(mdev)) { 892b10d96cbSJohannes Thoma case -1: 893b411b363SPhilipp Reisner dev_err(DEV, "Authentication of peer failed\n"); 894b411b363SPhilipp Reisner return -1; 895b10d96cbSJohannes Thoma case 0: 896b10d96cbSJohannes Thoma dev_err(DEV, "Authentication of peer failed, trying again.\n"); 897b10d96cbSJohannes Thoma return 0; 898b411b363SPhilipp Reisner } 899b411b363SPhilipp Reisner } 900b411b363SPhilipp Reisner 901b411b363SPhilipp Reisner if (drbd_request_state(mdev, NS(conn, C_WF_REPORT_PARAMS)) < SS_SUCCESS) 902b411b363SPhilipp Reisner return 0; 903b411b363SPhilipp Reisner 90489e58e75SPhilipp Reisner sock->sk->sk_sndtimeo = mdev->tconn->net_conf->timeout*HZ/10; 905b411b363SPhilipp Reisner sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 906b411b363SPhilipp Reisner 907b411b363SPhilipp Reisner atomic_set(&mdev->packet_seq, 0); 908b411b363SPhilipp Reisner mdev->peer_seq = 0; 909b411b363SPhilipp Reisner 910e6b3ea83SPhilipp Reisner drbd_thread_start(&mdev->tconn->asender); 911b411b363SPhilipp Reisner 912148efa16SPhilipp Reisner if (drbd_send_protocol(mdev) == -1) 9137e2455c1SPhilipp Reisner return -1; 914b411b363SPhilipp Reisner drbd_send_sync_param(mdev, &mdev->sync_conf); 915e89b591cSPhilipp Reisner drbd_send_sizes(mdev, 0, 0); 916b411b363SPhilipp Reisner drbd_send_uuids(mdev); 917b411b363SPhilipp Reisner drbd_send_state(mdev); 918b411b363SPhilipp Reisner clear_bit(USE_DEGR_WFC_T, &mdev->flags); 919b411b363SPhilipp Reisner clear_bit(RESIZE_PENDING, &mdev->flags); 9207fde2be9SPhilipp Reisner mod_timer(&mdev->request_timer, jiffies + HZ); /* just start it here. */ 921b411b363SPhilipp Reisner 922b411b363SPhilipp Reisner return 1; 923b411b363SPhilipp Reisner 924b411b363SPhilipp Reisner out_release_sockets: 925b411b363SPhilipp Reisner if (sock) 926b411b363SPhilipp Reisner sock_release(sock); 927b411b363SPhilipp Reisner if (msock) 928b411b363SPhilipp Reisner sock_release(msock); 929b411b363SPhilipp Reisner return -1; 930b411b363SPhilipp Reisner } 931b411b363SPhilipp Reisner 932d8763023SAndreas Gruenbacher static bool decode_header(struct drbd_conf *mdev, struct p_header *h, 933d8763023SAndreas Gruenbacher enum drbd_packet *cmd, unsigned int *packet_size) 934b411b363SPhilipp Reisner { 935fd340c12SPhilipp Reisner if (h->h80.magic == cpu_to_be32(DRBD_MAGIC)) { 93602918be2SPhilipp Reisner *cmd = be16_to_cpu(h->h80.command); 93702918be2SPhilipp Reisner *packet_size = be16_to_cpu(h->h80.length); 938ca9bc12bSAndreas Gruenbacher } else if (h->h95.magic == cpu_to_be16(DRBD_MAGIC_BIG)) { 93902918be2SPhilipp Reisner *cmd = be16_to_cpu(h->h95.command); 940fd340c12SPhilipp Reisner *packet_size = be32_to_cpu(h->h95.length) & 0x00ffffff; 94102918be2SPhilipp Reisner } else { 942004352faSLars Ellenberg dev_err(DEV, "magic?? on data m: 0x%08x c: %d l: %d\n", 943004352faSLars Ellenberg be32_to_cpu(h->h80.magic), 944004352faSLars Ellenberg be16_to_cpu(h->h80.command), 945004352faSLars Ellenberg be16_to_cpu(h->h80.length)); 94681e84650SAndreas Gruenbacher return false; 947b411b363SPhilipp Reisner } 948257d0af6SPhilipp Reisner return true; 949257d0af6SPhilipp Reisner } 950257d0af6SPhilipp Reisner 951d8763023SAndreas Gruenbacher static int drbd_recv_header(struct drbd_conf *mdev, enum drbd_packet *cmd, 952d8763023SAndreas Gruenbacher unsigned int *packet_size) 953257d0af6SPhilipp Reisner { 954257d0af6SPhilipp Reisner struct p_header *h = &mdev->tconn->data.rbuf.header; 955257d0af6SPhilipp Reisner int r; 956257d0af6SPhilipp Reisner 957257d0af6SPhilipp Reisner r = drbd_recv(mdev, h, sizeof(*h)); 958257d0af6SPhilipp Reisner if (unlikely(r != sizeof(*h))) { 959257d0af6SPhilipp Reisner if (!signal_pending(current)) 960257d0af6SPhilipp Reisner dev_warn(DEV, "short read expecting header on sock: r=%d\n", r); 961257d0af6SPhilipp Reisner return false; 962257d0af6SPhilipp Reisner } 963257d0af6SPhilipp Reisner 964257d0af6SPhilipp Reisner r = decode_header(mdev, h, cmd, packet_size); 96531890f4aSPhilipp Reisner mdev->tconn->last_received = jiffies; 966b411b363SPhilipp Reisner 967257d0af6SPhilipp Reisner return r; 968b411b363SPhilipp Reisner } 969b411b363SPhilipp Reisner 9702451fc3bSPhilipp Reisner static void drbd_flush(struct drbd_conf *mdev) 971b411b363SPhilipp Reisner { 972b411b363SPhilipp Reisner int rv; 973b411b363SPhilipp Reisner 974b411b363SPhilipp Reisner if (mdev->write_ordering >= WO_bdev_flush && get_ldev(mdev)) { 975fbd9b09aSDmitry Monakhov rv = blkdev_issue_flush(mdev->ldev->backing_bdev, GFP_KERNEL, 976dd3932edSChristoph Hellwig NULL); 977b411b363SPhilipp Reisner if (rv) { 978b411b363SPhilipp Reisner dev_err(DEV, "local disk flush failed with status %d\n", rv); 979b411b363SPhilipp Reisner /* would rather check on EOPNOTSUPP, but that is not reliable. 980b411b363SPhilipp Reisner * don't try again for ANY return value != 0 981b411b363SPhilipp Reisner * if (rv == -EOPNOTSUPP) */ 982b411b363SPhilipp Reisner drbd_bump_write_ordering(mdev, WO_drain_io); 983b411b363SPhilipp Reisner } 984b411b363SPhilipp Reisner put_ldev(mdev); 985b411b363SPhilipp Reisner } 986b411b363SPhilipp Reisner } 987b411b363SPhilipp Reisner 988b411b363SPhilipp Reisner /** 989b411b363SPhilipp Reisner * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. 990b411b363SPhilipp Reisner * @mdev: DRBD device. 991b411b363SPhilipp Reisner * @epoch: Epoch object. 992b411b363SPhilipp Reisner * @ev: Epoch event. 993b411b363SPhilipp Reisner */ 994b411b363SPhilipp Reisner static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev, 995b411b363SPhilipp Reisner struct drbd_epoch *epoch, 996b411b363SPhilipp Reisner enum epoch_event ev) 997b411b363SPhilipp Reisner { 9982451fc3bSPhilipp Reisner int epoch_size; 999b411b363SPhilipp Reisner struct drbd_epoch *next_epoch; 1000b411b363SPhilipp Reisner enum finish_epoch rv = FE_STILL_LIVE; 1001b411b363SPhilipp Reisner 1002b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1003b411b363SPhilipp Reisner do { 1004b411b363SPhilipp Reisner next_epoch = NULL; 1005b411b363SPhilipp Reisner 1006b411b363SPhilipp Reisner epoch_size = atomic_read(&epoch->epoch_size); 1007b411b363SPhilipp Reisner 1008b411b363SPhilipp Reisner switch (ev & ~EV_CLEANUP) { 1009b411b363SPhilipp Reisner case EV_PUT: 1010b411b363SPhilipp Reisner atomic_dec(&epoch->active); 1011b411b363SPhilipp Reisner break; 1012b411b363SPhilipp Reisner case EV_GOT_BARRIER_NR: 1013b411b363SPhilipp Reisner set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); 1014b411b363SPhilipp Reisner break; 1015b411b363SPhilipp Reisner case EV_BECAME_LAST: 1016b411b363SPhilipp Reisner /* nothing to do*/ 1017b411b363SPhilipp Reisner break; 1018b411b363SPhilipp Reisner } 1019b411b363SPhilipp Reisner 1020b411b363SPhilipp Reisner if (epoch_size != 0 && 1021b411b363SPhilipp Reisner atomic_read(&epoch->active) == 0 && 10222451fc3bSPhilipp Reisner test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) { 1023b411b363SPhilipp Reisner if (!(ev & EV_CLEANUP)) { 1024b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1025b411b363SPhilipp Reisner drbd_send_b_ack(mdev, epoch->barrier_nr, epoch_size); 1026b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1027b411b363SPhilipp Reisner } 1028b411b363SPhilipp Reisner dec_unacked(mdev); 1029b411b363SPhilipp Reisner 1030b411b363SPhilipp Reisner if (mdev->current_epoch != epoch) { 1031b411b363SPhilipp Reisner next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); 1032b411b363SPhilipp Reisner list_del(&epoch->list); 1033b411b363SPhilipp Reisner ev = EV_BECAME_LAST | (ev & EV_CLEANUP); 1034b411b363SPhilipp Reisner mdev->epochs--; 1035b411b363SPhilipp Reisner kfree(epoch); 1036b411b363SPhilipp Reisner 1037b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1038b411b363SPhilipp Reisner rv = FE_DESTROYED; 1039b411b363SPhilipp Reisner } else { 1040b411b363SPhilipp Reisner epoch->flags = 0; 1041b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1042698f9315SUwe Kleine-König /* atomic_set(&epoch->active, 0); is already zero */ 1043b411b363SPhilipp Reisner if (rv == FE_STILL_LIVE) 1044b411b363SPhilipp Reisner rv = FE_RECYCLED; 10452451fc3bSPhilipp Reisner wake_up(&mdev->ee_wait); 1046b411b363SPhilipp Reisner } 1047b411b363SPhilipp Reisner } 1048b411b363SPhilipp Reisner 1049b411b363SPhilipp Reisner if (!next_epoch) 1050b411b363SPhilipp Reisner break; 1051b411b363SPhilipp Reisner 1052b411b363SPhilipp Reisner epoch = next_epoch; 1053b411b363SPhilipp Reisner } while (1); 1054b411b363SPhilipp Reisner 1055b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1056b411b363SPhilipp Reisner 1057b411b363SPhilipp Reisner return rv; 1058b411b363SPhilipp Reisner } 1059b411b363SPhilipp Reisner 1060b411b363SPhilipp Reisner /** 1061b411b363SPhilipp Reisner * drbd_bump_write_ordering() - Fall back to an other write ordering method 1062b411b363SPhilipp Reisner * @mdev: DRBD device. 1063b411b363SPhilipp Reisner * @wo: Write ordering method to try. 1064b411b363SPhilipp Reisner */ 1065b411b363SPhilipp Reisner void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo) __must_hold(local) 1066b411b363SPhilipp Reisner { 1067b411b363SPhilipp Reisner enum write_ordering_e pwo; 1068b411b363SPhilipp Reisner static char *write_ordering_str[] = { 1069b411b363SPhilipp Reisner [WO_none] = "none", 1070b411b363SPhilipp Reisner [WO_drain_io] = "drain", 1071b411b363SPhilipp Reisner [WO_bdev_flush] = "flush", 1072b411b363SPhilipp Reisner }; 1073b411b363SPhilipp Reisner 1074b411b363SPhilipp Reisner pwo = mdev->write_ordering; 1075b411b363SPhilipp Reisner wo = min(pwo, wo); 1076b411b363SPhilipp Reisner if (wo == WO_bdev_flush && mdev->ldev->dc.no_disk_flush) 1077b411b363SPhilipp Reisner wo = WO_drain_io; 1078b411b363SPhilipp Reisner if (wo == WO_drain_io && mdev->ldev->dc.no_disk_drain) 1079b411b363SPhilipp Reisner wo = WO_none; 1080b411b363SPhilipp Reisner mdev->write_ordering = wo; 10812451fc3bSPhilipp Reisner if (pwo != mdev->write_ordering || wo == WO_bdev_flush) 1082b411b363SPhilipp Reisner dev_info(DEV, "Method to ensure write ordering: %s\n", write_ordering_str[mdev->write_ordering]); 1083b411b363SPhilipp Reisner } 1084b411b363SPhilipp Reisner 1085b411b363SPhilipp Reisner /** 108645bb912bSLars Ellenberg * drbd_submit_ee() 108745bb912bSLars Ellenberg * @mdev: DRBD device. 10886c852becSAndreas Gruenbacher * @e: peer request 108945bb912bSLars Ellenberg * @rw: flag field, see bio->bi_rw 109010f6d992SLars Ellenberg * 109110f6d992SLars Ellenberg * May spread the pages to multiple bios, 109210f6d992SLars Ellenberg * depending on bio_add_page restrictions. 109310f6d992SLars Ellenberg * 109410f6d992SLars Ellenberg * Returns 0 if all bios have been submitted, 109510f6d992SLars Ellenberg * -ENOMEM if we could not allocate enough bios, 109610f6d992SLars Ellenberg * -ENOSPC (any better suggestion?) if we have not been able to bio_add_page a 109710f6d992SLars Ellenberg * single page to an empty bio (which should never happen and likely indicates 109810f6d992SLars Ellenberg * that the lower level IO stack is in some way broken). This has been observed 109910f6d992SLars Ellenberg * on certain Xen deployments. 110045bb912bSLars Ellenberg */ 110145bb912bSLars Ellenberg /* TODO allocate from our own bio_set. */ 1102f6ffca9fSAndreas Gruenbacher int drbd_submit_ee(struct drbd_conf *mdev, struct drbd_peer_request *e, 110345bb912bSLars Ellenberg const unsigned rw, const int fault_type) 110445bb912bSLars Ellenberg { 110545bb912bSLars Ellenberg struct bio *bios = NULL; 110645bb912bSLars Ellenberg struct bio *bio; 110745bb912bSLars Ellenberg struct page *page = e->pages; 1108010f6e67SAndreas Gruenbacher sector_t sector = e->i.sector; 1109010f6e67SAndreas Gruenbacher unsigned ds = e->i.size; 111045bb912bSLars Ellenberg unsigned n_bios = 0; 111145bb912bSLars Ellenberg unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT; 111210f6d992SLars Ellenberg int err = -ENOMEM; 111345bb912bSLars Ellenberg 111445bb912bSLars Ellenberg /* In most cases, we will only need one bio. But in case the lower 111545bb912bSLars Ellenberg * level restrictions happen to be different at this offset on this 111645bb912bSLars Ellenberg * side than those of the sending peer, we may need to submit the 111745bb912bSLars Ellenberg * request in more than one bio. */ 111845bb912bSLars Ellenberg next_bio: 111945bb912bSLars Ellenberg bio = bio_alloc(GFP_NOIO, nr_pages); 112045bb912bSLars Ellenberg if (!bio) { 112145bb912bSLars Ellenberg dev_err(DEV, "submit_ee: Allocation of a bio failed\n"); 112245bb912bSLars Ellenberg goto fail; 112345bb912bSLars Ellenberg } 1124010f6e67SAndreas Gruenbacher /* > e->i.sector, unless this is the first bio */ 112545bb912bSLars Ellenberg bio->bi_sector = sector; 112645bb912bSLars Ellenberg bio->bi_bdev = mdev->ldev->backing_bdev; 112745bb912bSLars Ellenberg bio->bi_rw = rw; 112845bb912bSLars Ellenberg bio->bi_private = e; 112945bb912bSLars Ellenberg bio->bi_end_io = drbd_endio_sec; 113045bb912bSLars Ellenberg 113145bb912bSLars Ellenberg bio->bi_next = bios; 113245bb912bSLars Ellenberg bios = bio; 113345bb912bSLars Ellenberg ++n_bios; 113445bb912bSLars Ellenberg 113545bb912bSLars Ellenberg page_chain_for_each(page) { 113645bb912bSLars Ellenberg unsigned len = min_t(unsigned, ds, PAGE_SIZE); 113745bb912bSLars Ellenberg if (!bio_add_page(bio, page, len, 0)) { 113810f6d992SLars Ellenberg /* A single page must always be possible! 113910f6d992SLars Ellenberg * But in case it fails anyways, 114010f6d992SLars Ellenberg * we deal with it, and complain (below). */ 114110f6d992SLars Ellenberg if (bio->bi_vcnt == 0) { 114210f6d992SLars Ellenberg dev_err(DEV, 114310f6d992SLars Ellenberg "bio_add_page failed for len=%u, " 114410f6d992SLars Ellenberg "bi_vcnt=0 (bi_sector=%llu)\n", 114510f6d992SLars Ellenberg len, (unsigned long long)bio->bi_sector); 114610f6d992SLars Ellenberg err = -ENOSPC; 114710f6d992SLars Ellenberg goto fail; 114810f6d992SLars Ellenberg } 114945bb912bSLars Ellenberg goto next_bio; 115045bb912bSLars Ellenberg } 115145bb912bSLars Ellenberg ds -= len; 115245bb912bSLars Ellenberg sector += len >> 9; 115345bb912bSLars Ellenberg --nr_pages; 115445bb912bSLars Ellenberg } 115545bb912bSLars Ellenberg D_ASSERT(page == NULL); 115645bb912bSLars Ellenberg D_ASSERT(ds == 0); 115745bb912bSLars Ellenberg 115845bb912bSLars Ellenberg atomic_set(&e->pending_bios, n_bios); 115945bb912bSLars Ellenberg do { 116045bb912bSLars Ellenberg bio = bios; 116145bb912bSLars Ellenberg bios = bios->bi_next; 116245bb912bSLars Ellenberg bio->bi_next = NULL; 116345bb912bSLars Ellenberg 116445bb912bSLars Ellenberg drbd_generic_make_request(mdev, fault_type, bio); 116545bb912bSLars Ellenberg } while (bios); 116645bb912bSLars Ellenberg return 0; 116745bb912bSLars Ellenberg 116845bb912bSLars Ellenberg fail: 116945bb912bSLars Ellenberg while (bios) { 117045bb912bSLars Ellenberg bio = bios; 117145bb912bSLars Ellenberg bios = bios->bi_next; 117245bb912bSLars Ellenberg bio_put(bio); 117345bb912bSLars Ellenberg } 117410f6d992SLars Ellenberg return err; 117545bb912bSLars Ellenberg } 117645bb912bSLars Ellenberg 117753840641SAndreas Gruenbacher static void drbd_remove_epoch_entry_interval(struct drbd_conf *mdev, 1178f6ffca9fSAndreas Gruenbacher struct drbd_peer_request *e) 117953840641SAndreas Gruenbacher { 118053840641SAndreas Gruenbacher struct drbd_interval *i = &e->i; 118153840641SAndreas Gruenbacher 118253840641SAndreas Gruenbacher drbd_remove_interval(&mdev->write_requests, i); 118353840641SAndreas Gruenbacher drbd_clear_interval(i); 118453840641SAndreas Gruenbacher 11856c852becSAndreas Gruenbacher /* Wake up any processes waiting for this peer request to complete. */ 118653840641SAndreas Gruenbacher if (i->waiting) 118753840641SAndreas Gruenbacher wake_up(&mdev->misc_wait); 118853840641SAndreas Gruenbacher } 118953840641SAndreas Gruenbacher 1190d8763023SAndreas Gruenbacher static int receive_Barrier(struct drbd_conf *mdev, enum drbd_packet cmd, 1191d8763023SAndreas Gruenbacher unsigned int data_size) 1192b411b363SPhilipp Reisner { 11932451fc3bSPhilipp Reisner int rv; 1194e42325a5SPhilipp Reisner struct p_barrier *p = &mdev->tconn->data.rbuf.barrier; 1195b411b363SPhilipp Reisner struct drbd_epoch *epoch; 1196b411b363SPhilipp Reisner 1197b411b363SPhilipp Reisner inc_unacked(mdev); 1198b411b363SPhilipp Reisner 1199b411b363SPhilipp Reisner mdev->current_epoch->barrier_nr = p->barrier; 1200b411b363SPhilipp Reisner rv = drbd_may_finish_epoch(mdev, mdev->current_epoch, EV_GOT_BARRIER_NR); 1201b411b363SPhilipp Reisner 1202b411b363SPhilipp Reisner /* P_BARRIER_ACK may imply that the corresponding extent is dropped from 1203b411b363SPhilipp Reisner * the activity log, which means it would not be resynced in case the 1204b411b363SPhilipp Reisner * R_PRIMARY crashes now. 1205b411b363SPhilipp Reisner * Therefore we must send the barrier_ack after the barrier request was 1206b411b363SPhilipp Reisner * completed. */ 1207b411b363SPhilipp Reisner switch (mdev->write_ordering) { 1208b411b363SPhilipp Reisner case WO_none: 1209b411b363SPhilipp Reisner if (rv == FE_RECYCLED) 121081e84650SAndreas Gruenbacher return true; 1211b411b363SPhilipp Reisner 1212b411b363SPhilipp Reisner /* receiver context, in the writeout path of the other node. 1213b411b363SPhilipp Reisner * avoid potential distributed deadlock */ 1214b411b363SPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 12152451fc3bSPhilipp Reisner if (epoch) 12162451fc3bSPhilipp Reisner break; 12172451fc3bSPhilipp Reisner else 1218b411b363SPhilipp Reisner dev_warn(DEV, "Allocation of an epoch failed, slowing down\n"); 12192451fc3bSPhilipp Reisner /* Fall through */ 12202451fc3bSPhilipp Reisner 12212451fc3bSPhilipp Reisner case WO_bdev_flush: 12222451fc3bSPhilipp Reisner case WO_drain_io: 1223b411b363SPhilipp Reisner drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 12242451fc3bSPhilipp Reisner drbd_flush(mdev); 12252451fc3bSPhilipp Reisner 12262451fc3bSPhilipp Reisner if (atomic_read(&mdev->current_epoch->epoch_size)) { 12272451fc3bSPhilipp Reisner epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); 12282451fc3bSPhilipp Reisner if (epoch) 12292451fc3bSPhilipp Reisner break; 1230b411b363SPhilipp Reisner } 1231b411b363SPhilipp Reisner 12322451fc3bSPhilipp Reisner epoch = mdev->current_epoch; 12332451fc3bSPhilipp Reisner wait_event(mdev->ee_wait, atomic_read(&epoch->epoch_size) == 0); 12342451fc3bSPhilipp Reisner 12352451fc3bSPhilipp Reisner D_ASSERT(atomic_read(&epoch->active) == 0); 12362451fc3bSPhilipp Reisner D_ASSERT(epoch->flags == 0); 1237b411b363SPhilipp Reisner 123881e84650SAndreas Gruenbacher return true; 12392451fc3bSPhilipp Reisner default: 12402451fc3bSPhilipp Reisner dev_err(DEV, "Strangeness in mdev->write_ordering %d\n", mdev->write_ordering); 124181e84650SAndreas Gruenbacher return false; 1242b411b363SPhilipp Reisner } 1243b411b363SPhilipp Reisner 1244b411b363SPhilipp Reisner epoch->flags = 0; 1245b411b363SPhilipp Reisner atomic_set(&epoch->epoch_size, 0); 1246b411b363SPhilipp Reisner atomic_set(&epoch->active, 0); 1247b411b363SPhilipp Reisner 1248b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1249b411b363SPhilipp Reisner if (atomic_read(&mdev->current_epoch->epoch_size)) { 1250b411b363SPhilipp Reisner list_add(&epoch->list, &mdev->current_epoch->list); 1251b411b363SPhilipp Reisner mdev->current_epoch = epoch; 1252b411b363SPhilipp Reisner mdev->epochs++; 1253b411b363SPhilipp Reisner } else { 1254b411b363SPhilipp Reisner /* The current_epoch got recycled while we allocated this one... */ 1255b411b363SPhilipp Reisner kfree(epoch); 1256b411b363SPhilipp Reisner } 1257b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1258b411b363SPhilipp Reisner 125981e84650SAndreas Gruenbacher return true; 1260b411b363SPhilipp Reisner } 1261b411b363SPhilipp Reisner 1262b411b363SPhilipp Reisner /* used from receive_RSDataReply (recv_resync_read) 1263b411b363SPhilipp Reisner * and from receive_Data */ 1264f6ffca9fSAndreas Gruenbacher static struct drbd_peer_request * 1265f6ffca9fSAndreas Gruenbacher read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, 1266f6ffca9fSAndreas Gruenbacher int data_size) __must_hold(local) 1267b411b363SPhilipp Reisner { 12686666032aSLars Ellenberg const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 1269f6ffca9fSAndreas Gruenbacher struct drbd_peer_request *e; 1270b411b363SPhilipp Reisner struct page *page; 127145bb912bSLars Ellenberg int dgs, ds, rr; 1272a0638456SPhilipp Reisner void *dig_in = mdev->tconn->int_dig_in; 1273a0638456SPhilipp Reisner void *dig_vv = mdev->tconn->int_dig_vv; 12746b4388acSPhilipp Reisner unsigned long *data; 1275b411b363SPhilipp Reisner 1276a0638456SPhilipp Reisner dgs = (mdev->tconn->agreed_pro_version >= 87 && mdev->tconn->integrity_r_tfm) ? 1277a0638456SPhilipp Reisner crypto_hash_digestsize(mdev->tconn->integrity_r_tfm) : 0; 1278b411b363SPhilipp Reisner 1279b411b363SPhilipp Reisner if (dgs) { 1280b411b363SPhilipp Reisner rr = drbd_recv(mdev, dig_in, dgs); 1281b411b363SPhilipp Reisner if (rr != dgs) { 12820ddc5549SLars Ellenberg if (!signal_pending(current)) 12830ddc5549SLars Ellenberg dev_warn(DEV, 12840ddc5549SLars Ellenberg "short read receiving data digest: read %d expected %d\n", 1285b411b363SPhilipp Reisner rr, dgs); 1286b411b363SPhilipp Reisner return NULL; 1287b411b363SPhilipp Reisner } 1288b411b363SPhilipp Reisner } 1289b411b363SPhilipp Reisner 1290b411b363SPhilipp Reisner data_size -= dgs; 1291b411b363SPhilipp Reisner 1292841ce241SAndreas Gruenbacher if (!expect(data_size != 0)) 1293841ce241SAndreas Gruenbacher return NULL; 1294841ce241SAndreas Gruenbacher if (!expect(IS_ALIGNED(data_size, 512))) 1295841ce241SAndreas Gruenbacher return NULL; 1296841ce241SAndreas Gruenbacher if (!expect(data_size <= DRBD_MAX_BIO_SIZE)) 1297841ce241SAndreas Gruenbacher return NULL; 1298b411b363SPhilipp Reisner 12996666032aSLars Ellenberg /* even though we trust out peer, 13006666032aSLars Ellenberg * we sometimes have to double check. */ 13016666032aSLars Ellenberg if (sector + (data_size>>9) > capacity) { 1302fdda6544SLars Ellenberg dev_err(DEV, "request from peer beyond end of local disk: " 1303fdda6544SLars Ellenberg "capacity: %llus < sector: %llus + size: %u\n", 13046666032aSLars Ellenberg (unsigned long long)capacity, 13056666032aSLars Ellenberg (unsigned long long)sector, data_size); 13066666032aSLars Ellenberg return NULL; 13076666032aSLars Ellenberg } 13086666032aSLars Ellenberg 1309b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 1310b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 1311b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 1312b411b363SPhilipp Reisner e = drbd_alloc_ee(mdev, id, sector, data_size, GFP_NOIO); 1313b411b363SPhilipp Reisner if (!e) 1314b411b363SPhilipp Reisner return NULL; 131545bb912bSLars Ellenberg 1316b411b363SPhilipp Reisner ds = data_size; 131745bb912bSLars Ellenberg page = e->pages; 131845bb912bSLars Ellenberg page_chain_for_each(page) { 131945bb912bSLars Ellenberg unsigned len = min_t(int, ds, PAGE_SIZE); 13206b4388acSPhilipp Reisner data = kmap(page); 132145bb912bSLars Ellenberg rr = drbd_recv(mdev, data, len); 13220cf9d27eSAndreas Gruenbacher if (drbd_insert_fault(mdev, DRBD_FAULT_RECEIVE)) { 13236b4388acSPhilipp Reisner dev_err(DEV, "Fault injection: Corrupting data on receive\n"); 13246b4388acSPhilipp Reisner data[0] = data[0] ^ (unsigned long)-1; 13256b4388acSPhilipp Reisner } 1326b411b363SPhilipp Reisner kunmap(page); 132745bb912bSLars Ellenberg if (rr != len) { 1328b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 13290ddc5549SLars Ellenberg if (!signal_pending(current)) 1330b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data: read %d expected %d\n", 133145bb912bSLars Ellenberg rr, len); 1332b411b363SPhilipp Reisner return NULL; 1333b411b363SPhilipp Reisner } 1334b411b363SPhilipp Reisner ds -= rr; 1335b411b363SPhilipp Reisner } 1336b411b363SPhilipp Reisner 1337b411b363SPhilipp Reisner if (dgs) { 1338a0638456SPhilipp Reisner drbd_csum_ee(mdev, mdev->tconn->integrity_r_tfm, e, dig_vv); 1339b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1340470be44aSLars Ellenberg dev_err(DEV, "Digest integrity check FAILED: %llus +%u\n", 1341470be44aSLars Ellenberg (unsigned long long)sector, data_size); 1342b411b363SPhilipp Reisner drbd_bcast_ee(mdev, "digest failed", 1343b411b363SPhilipp Reisner dgs, dig_in, dig_vv, e); 1344b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 1345b411b363SPhilipp Reisner return NULL; 1346b411b363SPhilipp Reisner } 1347b411b363SPhilipp Reisner } 1348b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1349b411b363SPhilipp Reisner return e; 1350b411b363SPhilipp Reisner } 1351b411b363SPhilipp Reisner 1352b411b363SPhilipp Reisner /* drbd_drain_block() just takes a data block 1353b411b363SPhilipp Reisner * out of the socket input buffer, and discards it. 1354b411b363SPhilipp Reisner */ 1355b411b363SPhilipp Reisner static int drbd_drain_block(struct drbd_conf *mdev, int data_size) 1356b411b363SPhilipp Reisner { 1357b411b363SPhilipp Reisner struct page *page; 1358b411b363SPhilipp Reisner int rr, rv = 1; 1359b411b363SPhilipp Reisner void *data; 1360b411b363SPhilipp Reisner 1361c3470cdeSLars Ellenberg if (!data_size) 136281e84650SAndreas Gruenbacher return true; 1363c3470cdeSLars Ellenberg 136445bb912bSLars Ellenberg page = drbd_pp_alloc(mdev, 1, 1); 1365b411b363SPhilipp Reisner 1366b411b363SPhilipp Reisner data = kmap(page); 1367b411b363SPhilipp Reisner while (data_size) { 1368b411b363SPhilipp Reisner rr = drbd_recv(mdev, data, min_t(int, data_size, PAGE_SIZE)); 1369b411b363SPhilipp Reisner if (rr != min_t(int, data_size, PAGE_SIZE)) { 1370b411b363SPhilipp Reisner rv = 0; 13710ddc5549SLars Ellenberg if (!signal_pending(current)) 13720ddc5549SLars Ellenberg dev_warn(DEV, 13730ddc5549SLars Ellenberg "short read receiving data: read %d expected %d\n", 1374b411b363SPhilipp Reisner rr, min_t(int, data_size, PAGE_SIZE)); 1375b411b363SPhilipp Reisner break; 1376b411b363SPhilipp Reisner } 1377b411b363SPhilipp Reisner data_size -= rr; 1378b411b363SPhilipp Reisner } 1379b411b363SPhilipp Reisner kunmap(page); 1380435f0740SLars Ellenberg drbd_pp_free(mdev, page, 0); 1381b411b363SPhilipp Reisner return rv; 1382b411b363SPhilipp Reisner } 1383b411b363SPhilipp Reisner 1384b411b363SPhilipp Reisner static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req, 1385b411b363SPhilipp Reisner sector_t sector, int data_size) 1386b411b363SPhilipp Reisner { 1387b411b363SPhilipp Reisner struct bio_vec *bvec; 1388b411b363SPhilipp Reisner struct bio *bio; 1389b411b363SPhilipp Reisner int dgs, rr, i, expect; 1390a0638456SPhilipp Reisner void *dig_in = mdev->tconn->int_dig_in; 1391a0638456SPhilipp Reisner void *dig_vv = mdev->tconn->int_dig_vv; 1392b411b363SPhilipp Reisner 1393a0638456SPhilipp Reisner dgs = (mdev->tconn->agreed_pro_version >= 87 && mdev->tconn->integrity_r_tfm) ? 1394a0638456SPhilipp Reisner crypto_hash_digestsize(mdev->tconn->integrity_r_tfm) : 0; 1395b411b363SPhilipp Reisner 1396b411b363SPhilipp Reisner if (dgs) { 1397b411b363SPhilipp Reisner rr = drbd_recv(mdev, dig_in, dgs); 1398b411b363SPhilipp Reisner if (rr != dgs) { 13990ddc5549SLars Ellenberg if (!signal_pending(current)) 14000ddc5549SLars Ellenberg dev_warn(DEV, 14010ddc5549SLars Ellenberg "short read receiving data reply digest: read %d expected %d\n", 1402b411b363SPhilipp Reisner rr, dgs); 1403b411b363SPhilipp Reisner return 0; 1404b411b363SPhilipp Reisner } 1405b411b363SPhilipp Reisner } 1406b411b363SPhilipp Reisner 1407b411b363SPhilipp Reisner data_size -= dgs; 1408b411b363SPhilipp Reisner 1409b411b363SPhilipp Reisner /* optimistically update recv_cnt. if receiving fails below, 1410b411b363SPhilipp Reisner * we disconnect anyways, and counters will be reset. */ 1411b411b363SPhilipp Reisner mdev->recv_cnt += data_size>>9; 1412b411b363SPhilipp Reisner 1413b411b363SPhilipp Reisner bio = req->master_bio; 1414b411b363SPhilipp Reisner D_ASSERT(sector == bio->bi_sector); 1415b411b363SPhilipp Reisner 1416b411b363SPhilipp Reisner bio_for_each_segment(bvec, bio, i) { 1417b411b363SPhilipp Reisner expect = min_t(int, data_size, bvec->bv_len); 1418b411b363SPhilipp Reisner rr = drbd_recv(mdev, 1419b411b363SPhilipp Reisner kmap(bvec->bv_page)+bvec->bv_offset, 1420b411b363SPhilipp Reisner expect); 1421b411b363SPhilipp Reisner kunmap(bvec->bv_page); 1422b411b363SPhilipp Reisner if (rr != expect) { 14230ddc5549SLars Ellenberg if (!signal_pending(current)) 1424b411b363SPhilipp Reisner dev_warn(DEV, "short read receiving data reply: " 1425b411b363SPhilipp Reisner "read %d expected %d\n", 1426b411b363SPhilipp Reisner rr, expect); 1427b411b363SPhilipp Reisner return 0; 1428b411b363SPhilipp Reisner } 1429b411b363SPhilipp Reisner data_size -= rr; 1430b411b363SPhilipp Reisner } 1431b411b363SPhilipp Reisner 1432b411b363SPhilipp Reisner if (dgs) { 1433a0638456SPhilipp Reisner drbd_csum_bio(mdev, mdev->tconn->integrity_r_tfm, bio, dig_vv); 1434b411b363SPhilipp Reisner if (memcmp(dig_in, dig_vv, dgs)) { 1435b411b363SPhilipp Reisner dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n"); 1436b411b363SPhilipp Reisner return 0; 1437b411b363SPhilipp Reisner } 1438b411b363SPhilipp Reisner } 1439b411b363SPhilipp Reisner 1440b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 1441b411b363SPhilipp Reisner return 1; 1442b411b363SPhilipp Reisner } 1443b411b363SPhilipp Reisner 1444b411b363SPhilipp Reisner /* e_end_resync_block() is called via 1445b411b363SPhilipp Reisner * drbd_process_done_ee() by asender only */ 1446b411b363SPhilipp Reisner static int e_end_resync_block(struct drbd_conf *mdev, struct drbd_work *w, int unused) 1447b411b363SPhilipp Reisner { 1448f6ffca9fSAndreas Gruenbacher struct drbd_peer_request *e = (struct drbd_peer_request *)w; 1449010f6e67SAndreas Gruenbacher sector_t sector = e->i.sector; 1450b411b363SPhilipp Reisner int ok; 1451b411b363SPhilipp Reisner 14528b946255SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&e->i)); 1453b411b363SPhilipp Reisner 145445bb912bSLars Ellenberg if (likely((e->flags & EE_WAS_ERROR) == 0)) { 1455010f6e67SAndreas Gruenbacher drbd_set_in_sync(mdev, sector, e->i.size); 1456b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_RS_WRITE_ACK, e); 1457b411b363SPhilipp Reisner } else { 1458b411b363SPhilipp Reisner /* Record failure to sync */ 1459010f6e67SAndreas Gruenbacher drbd_rs_failed_io(mdev, sector, e->i.size); 1460b411b363SPhilipp Reisner 1461b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_NEG_ACK, e); 1462b411b363SPhilipp Reisner } 1463b411b363SPhilipp Reisner dec_unacked(mdev); 1464b411b363SPhilipp Reisner 1465b411b363SPhilipp Reisner return ok; 1466b411b363SPhilipp Reisner } 1467b411b363SPhilipp Reisner 1468b411b363SPhilipp Reisner static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local) 1469b411b363SPhilipp Reisner { 1470f6ffca9fSAndreas Gruenbacher struct drbd_peer_request *e; 1471b411b363SPhilipp Reisner 1472b411b363SPhilipp Reisner e = read_in_block(mdev, ID_SYNCER, sector, data_size); 147345bb912bSLars Ellenberg if (!e) 147445bb912bSLars Ellenberg goto fail; 1475b411b363SPhilipp Reisner 1476b411b363SPhilipp Reisner dec_rs_pending(mdev); 1477b411b363SPhilipp Reisner 1478b411b363SPhilipp Reisner inc_unacked(mdev); 1479b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_resync_block() 1480b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 1481b411b363SPhilipp Reisner 148245bb912bSLars Ellenberg e->w.cb = e_end_resync_block; 148345bb912bSLars Ellenberg 148487eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1485b411b363SPhilipp Reisner list_add(&e->w.list, &mdev->sync_ee); 148687eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1487b411b363SPhilipp Reisner 14880f0601f4SLars Ellenberg atomic_add(data_size >> 9, &mdev->rs_sect_ev); 148945bb912bSLars Ellenberg if (drbd_submit_ee(mdev, e, WRITE, DRBD_FAULT_RS_WR) == 0) 149081e84650SAndreas Gruenbacher return true; 149145bb912bSLars Ellenberg 149210f6d992SLars Ellenberg /* don't care for the reason here */ 149310f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 149487eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 149522cc37a9SLars Ellenberg list_del(&e->w.list); 149687eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 149722cc37a9SLars Ellenberg 149845bb912bSLars Ellenberg drbd_free_ee(mdev, e); 149945bb912bSLars Ellenberg fail: 150045bb912bSLars Ellenberg put_ldev(mdev); 150181e84650SAndreas Gruenbacher return false; 1502b411b363SPhilipp Reisner } 1503b411b363SPhilipp Reisner 1504668eebc6SAndreas Gruenbacher static struct drbd_request * 1505bc9c5c41SAndreas Gruenbacher find_request(struct drbd_conf *mdev, struct rb_root *root, u64 id, 1506bc9c5c41SAndreas Gruenbacher sector_t sector, bool missing_ok, const char *func) 1507668eebc6SAndreas Gruenbacher { 1508668eebc6SAndreas Gruenbacher struct drbd_request *req; 1509668eebc6SAndreas Gruenbacher 1510bc9c5c41SAndreas Gruenbacher /* Request object according to our peer */ 1511bc9c5c41SAndreas Gruenbacher req = (struct drbd_request *)(unsigned long)id; 15125e472264SAndreas Gruenbacher if (drbd_contains_interval(root, sector, &req->i) && req->i.local) 1513668eebc6SAndreas Gruenbacher return req; 1514c3afd8f5SAndreas Gruenbacher if (!missing_ok) { 1515c3afd8f5SAndreas Gruenbacher dev_err(DEV, "%s: failed to find request %lu, sector %llus\n", func, 1516c3afd8f5SAndreas Gruenbacher (unsigned long)id, (unsigned long long)sector); 1517c3afd8f5SAndreas Gruenbacher } 1518668eebc6SAndreas Gruenbacher return NULL; 1519668eebc6SAndreas Gruenbacher } 1520668eebc6SAndreas Gruenbacher 1521d8763023SAndreas Gruenbacher static int receive_DataReply(struct drbd_conf *mdev, enum drbd_packet cmd, 1522d8763023SAndreas Gruenbacher unsigned int data_size) 1523b411b363SPhilipp Reisner { 1524b411b363SPhilipp Reisner struct drbd_request *req; 1525b411b363SPhilipp Reisner sector_t sector; 1526b411b363SPhilipp Reisner int ok; 1527e42325a5SPhilipp Reisner struct p_data *p = &mdev->tconn->data.rbuf.data; 1528b411b363SPhilipp Reisner 1529b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1530b411b363SPhilipp Reisner 153187eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1532bc9c5c41SAndreas Gruenbacher req = find_request(mdev, &mdev->read_requests, p->block_id, sector, false, __func__); 153387eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1534c3afd8f5SAndreas Gruenbacher if (unlikely(!req)) 153581e84650SAndreas Gruenbacher return false; 1536b411b363SPhilipp Reisner 153724c4830cSBart Van Assche /* hlist_del(&req->collision) is done in _req_may_be_done, to avoid 1538b411b363SPhilipp Reisner * special casing it there for the various failure cases. 1539b411b363SPhilipp Reisner * still no race with drbd_fail_pending_reads */ 1540b411b363SPhilipp Reisner ok = recv_dless_read(mdev, req, sector, data_size); 1541b411b363SPhilipp Reisner 1542b411b363SPhilipp Reisner if (ok) 15438554df1cSAndreas Gruenbacher req_mod(req, DATA_RECEIVED); 1544b411b363SPhilipp Reisner /* else: nothing. handled from drbd_disconnect... 1545b411b363SPhilipp Reisner * I don't think we may complete this just yet 1546b411b363SPhilipp Reisner * in case we are "on-disconnect: freeze" */ 1547b411b363SPhilipp Reisner 1548b411b363SPhilipp Reisner return ok; 1549b411b363SPhilipp Reisner } 1550b411b363SPhilipp Reisner 1551d8763023SAndreas Gruenbacher static int receive_RSDataReply(struct drbd_conf *mdev, enum drbd_packet cmd, 1552d8763023SAndreas Gruenbacher unsigned int data_size) 1553b411b363SPhilipp Reisner { 1554b411b363SPhilipp Reisner sector_t sector; 1555b411b363SPhilipp Reisner int ok; 1556e42325a5SPhilipp Reisner struct p_data *p = &mdev->tconn->data.rbuf.data; 1557b411b363SPhilipp Reisner 1558b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1559b411b363SPhilipp Reisner D_ASSERT(p->block_id == ID_SYNCER); 1560b411b363SPhilipp Reisner 1561b411b363SPhilipp Reisner if (get_ldev(mdev)) { 1562b411b363SPhilipp Reisner /* data is submitted to disk within recv_resync_read. 1563b411b363SPhilipp Reisner * corresponding put_ldev done below on error, 15649c50842aSAndreas Gruenbacher * or in drbd_endio_sec. */ 1565b411b363SPhilipp Reisner ok = recv_resync_read(mdev, sector, data_size); 1566b411b363SPhilipp Reisner } else { 1567b411b363SPhilipp Reisner if (__ratelimit(&drbd_ratelimit_state)) 1568b411b363SPhilipp Reisner dev_err(DEV, "Can not write resync data to local disk.\n"); 1569b411b363SPhilipp Reisner 1570b411b363SPhilipp Reisner ok = drbd_drain_block(mdev, data_size); 1571b411b363SPhilipp Reisner 15722b2bf214SLars Ellenberg drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size); 1573b411b363SPhilipp Reisner } 1574b411b363SPhilipp Reisner 1575778f271dSPhilipp Reisner atomic_add(data_size >> 9, &mdev->rs_sect_in); 1576778f271dSPhilipp Reisner 1577b411b363SPhilipp Reisner return ok; 1578b411b363SPhilipp Reisner } 1579b411b363SPhilipp Reisner 1580b411b363SPhilipp Reisner /* e_end_block() is called via drbd_process_done_ee(). 1581b411b363SPhilipp Reisner * this means this function only runs in the asender thread 1582b411b363SPhilipp Reisner */ 1583b411b363SPhilipp Reisner static int e_end_block(struct drbd_conf *mdev, struct drbd_work *w, int cancel) 1584b411b363SPhilipp Reisner { 1585f6ffca9fSAndreas Gruenbacher struct drbd_peer_request *e = (struct drbd_peer_request *)w; 1586010f6e67SAndreas Gruenbacher sector_t sector = e->i.sector; 1587b411b363SPhilipp Reisner int ok = 1, pcmd; 1588b411b363SPhilipp Reisner 158989e58e75SPhilipp Reisner if (mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C) { 159045bb912bSLars Ellenberg if (likely((e->flags & EE_WAS_ERROR) == 0)) { 1591b411b363SPhilipp Reisner pcmd = (mdev->state.conn >= C_SYNC_SOURCE && 1592b411b363SPhilipp Reisner mdev->state.conn <= C_PAUSED_SYNC_T && 1593b411b363SPhilipp Reisner e->flags & EE_MAY_SET_IN_SYNC) ? 1594b411b363SPhilipp Reisner P_RS_WRITE_ACK : P_WRITE_ACK; 1595b411b363SPhilipp Reisner ok &= drbd_send_ack(mdev, pcmd, e); 1596b411b363SPhilipp Reisner if (pcmd == P_RS_WRITE_ACK) 1597010f6e67SAndreas Gruenbacher drbd_set_in_sync(mdev, sector, e->i.size); 1598b411b363SPhilipp Reisner } else { 1599b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_NEG_ACK, e); 1600b411b363SPhilipp Reisner /* we expect it to be marked out of sync anyways... 1601b411b363SPhilipp Reisner * maybe assert this? */ 1602b411b363SPhilipp Reisner } 1603b411b363SPhilipp Reisner dec_unacked(mdev); 1604b411b363SPhilipp Reisner } 1605b411b363SPhilipp Reisner /* we delete from the conflict detection hash _after_ we sent out the 1606b411b363SPhilipp Reisner * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ 160789e58e75SPhilipp Reisner if (mdev->tconn->net_conf->two_primaries) { 160887eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 16098b946255SAndreas Gruenbacher D_ASSERT(!drbd_interval_empty(&e->i)); 161053840641SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, e); 161187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1612bb3bfe96SAndreas Gruenbacher } else 16138b946255SAndreas Gruenbacher D_ASSERT(drbd_interval_empty(&e->i)); 1614b411b363SPhilipp Reisner 1615b411b363SPhilipp Reisner drbd_may_finish_epoch(mdev, e->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); 1616b411b363SPhilipp Reisner 1617b411b363SPhilipp Reisner return ok; 1618b411b363SPhilipp Reisner } 1619b411b363SPhilipp Reisner 1620b411b363SPhilipp Reisner static int e_send_discard_ack(struct drbd_conf *mdev, struct drbd_work *w, int unused) 1621b411b363SPhilipp Reisner { 1622f6ffca9fSAndreas Gruenbacher struct drbd_peer_request *e = (struct drbd_peer_request *)w; 1623b411b363SPhilipp Reisner int ok = 1; 1624b411b363SPhilipp Reisner 162589e58e75SPhilipp Reisner D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C); 1626b411b363SPhilipp Reisner ok = drbd_send_ack(mdev, P_DISCARD_ACK, e); 1627b411b363SPhilipp Reisner 162887eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 16298b946255SAndreas Gruenbacher D_ASSERT(!drbd_interval_empty(&e->i)); 163053840641SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, e); 163187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1632b411b363SPhilipp Reisner 1633b411b363SPhilipp Reisner dec_unacked(mdev); 1634b411b363SPhilipp Reisner 1635b411b363SPhilipp Reisner return ok; 1636b411b363SPhilipp Reisner } 1637b411b363SPhilipp Reisner 16383e394da1SAndreas Gruenbacher static bool seq_greater(u32 a, u32 b) 16393e394da1SAndreas Gruenbacher { 16403e394da1SAndreas Gruenbacher /* 16413e394da1SAndreas Gruenbacher * We assume 32-bit wrap-around here. 16423e394da1SAndreas Gruenbacher * For 24-bit wrap-around, we would have to shift: 16433e394da1SAndreas Gruenbacher * a <<= 8; b <<= 8; 16443e394da1SAndreas Gruenbacher */ 16453e394da1SAndreas Gruenbacher return (s32)a - (s32)b > 0; 16463e394da1SAndreas Gruenbacher } 16473e394da1SAndreas Gruenbacher 16483e394da1SAndreas Gruenbacher static u32 seq_max(u32 a, u32 b) 16493e394da1SAndreas Gruenbacher { 16503e394da1SAndreas Gruenbacher return seq_greater(a, b) ? a : b; 16513e394da1SAndreas Gruenbacher } 16523e394da1SAndreas Gruenbacher 165343ae077dSAndreas Gruenbacher static void update_peer_seq(struct drbd_conf *mdev, unsigned int peer_seq) 16543e394da1SAndreas Gruenbacher { 165543ae077dSAndreas Gruenbacher unsigned int old_peer_seq; 16563e394da1SAndreas Gruenbacher 16573e394da1SAndreas Gruenbacher spin_lock(&mdev->peer_seq_lock); 165843ae077dSAndreas Gruenbacher old_peer_seq = mdev->peer_seq; 165943ae077dSAndreas Gruenbacher mdev->peer_seq = seq_max(mdev->peer_seq, peer_seq); 16603e394da1SAndreas Gruenbacher spin_unlock(&mdev->peer_seq_lock); 166143ae077dSAndreas Gruenbacher if (old_peer_seq != peer_seq) 16623e394da1SAndreas Gruenbacher wake_up(&mdev->seq_wait); 16633e394da1SAndreas Gruenbacher } 16643e394da1SAndreas Gruenbacher 1665b411b363SPhilipp Reisner /* Called from receive_Data. 1666b411b363SPhilipp Reisner * Synchronize packets on sock with packets on msock. 1667b411b363SPhilipp Reisner * 1668b411b363SPhilipp Reisner * This is here so even when a P_DATA packet traveling via sock overtook an Ack 1669b411b363SPhilipp Reisner * packet traveling on msock, they are still processed in the order they have 1670b411b363SPhilipp Reisner * been sent. 1671b411b363SPhilipp Reisner * 1672b411b363SPhilipp Reisner * Note: we don't care for Ack packets overtaking P_DATA packets. 1673b411b363SPhilipp Reisner * 1674b411b363SPhilipp Reisner * In case packet_seq is larger than mdev->peer_seq number, there are 1675b411b363SPhilipp Reisner * outstanding packets on the msock. We wait for them to arrive. 1676b411b363SPhilipp Reisner * In case we are the logically next packet, we update mdev->peer_seq 1677b411b363SPhilipp Reisner * ourselves. Correctly handles 32bit wrap around. 1678b411b363SPhilipp Reisner * 1679b411b363SPhilipp Reisner * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, 1680b411b363SPhilipp Reisner * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds 1681b411b363SPhilipp Reisner * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have 1682b411b363SPhilipp Reisner * 1<<9 == 512 seconds aka ages for the 32bit wrap around... 1683b411b363SPhilipp Reisner * 1684b411b363SPhilipp Reisner * returns 0 if we may process the packet, 1685b411b363SPhilipp Reisner * -ERESTARTSYS if we were interrupted (by disconnect signal). */ 1686b411b363SPhilipp Reisner static int drbd_wait_peer_seq(struct drbd_conf *mdev, const u32 packet_seq) 1687b411b363SPhilipp Reisner { 1688b411b363SPhilipp Reisner DEFINE_WAIT(wait); 1689b411b363SPhilipp Reisner unsigned int p_seq; 1690b411b363SPhilipp Reisner long timeout; 1691b411b363SPhilipp Reisner int ret = 0; 1692b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1693b411b363SPhilipp Reisner for (;;) { 1694b411b363SPhilipp Reisner prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE); 16953e394da1SAndreas Gruenbacher if (!seq_greater(packet_seq, mdev->peer_seq + 1)) 1696b411b363SPhilipp Reisner break; 1697b411b363SPhilipp Reisner if (signal_pending(current)) { 1698b411b363SPhilipp Reisner ret = -ERESTARTSYS; 1699b411b363SPhilipp Reisner break; 1700b411b363SPhilipp Reisner } 1701b411b363SPhilipp Reisner p_seq = mdev->peer_seq; 1702b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1703b411b363SPhilipp Reisner timeout = schedule_timeout(30*HZ); 1704b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1705b411b363SPhilipp Reisner if (timeout == 0 && p_seq == mdev->peer_seq) { 1706b411b363SPhilipp Reisner ret = -ETIMEDOUT; 1707b411b363SPhilipp Reisner dev_err(DEV, "ASSERT FAILED waited 30 seconds for sequence update, forcing reconnect\n"); 1708b411b363SPhilipp Reisner break; 1709b411b363SPhilipp Reisner } 1710b411b363SPhilipp Reisner } 1711b411b363SPhilipp Reisner finish_wait(&mdev->seq_wait, &wait); 1712b411b363SPhilipp Reisner if (mdev->peer_seq+1 == packet_seq) 1713b411b363SPhilipp Reisner mdev->peer_seq++; 1714b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1715b411b363SPhilipp Reisner return ret; 1716b411b363SPhilipp Reisner } 1717b411b363SPhilipp Reisner 1718688593c5SLars Ellenberg /* see also bio_flags_to_wire() 1719688593c5SLars Ellenberg * DRBD_REQ_*, because we need to semantically map the flags to data packet 1720688593c5SLars Ellenberg * flags and back. We may replicate to other kernel versions. */ 1721688593c5SLars Ellenberg static unsigned long wire_flags_to_bio(struct drbd_conf *mdev, u32 dpf) 172276d2e7ecSPhilipp Reisner { 172376d2e7ecSPhilipp Reisner return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | 172476d2e7ecSPhilipp Reisner (dpf & DP_FUA ? REQ_FUA : 0) | 1725688593c5SLars Ellenberg (dpf & DP_FLUSH ? REQ_FLUSH : 0) | 172676d2e7ecSPhilipp Reisner (dpf & DP_DISCARD ? REQ_DISCARD : 0); 172776d2e7ecSPhilipp Reisner } 172876d2e7ecSPhilipp Reisner 1729b411b363SPhilipp Reisner /* mirrored write */ 1730d8763023SAndreas Gruenbacher static int receive_Data(struct drbd_conf *mdev, enum drbd_packet cmd, 1731d8763023SAndreas Gruenbacher unsigned int data_size) 1732b411b363SPhilipp Reisner { 1733b411b363SPhilipp Reisner sector_t sector; 1734f6ffca9fSAndreas Gruenbacher struct drbd_peer_request *e; 1735e42325a5SPhilipp Reisner struct p_data *p = &mdev->tconn->data.rbuf.data; 1736b411b363SPhilipp Reisner int rw = WRITE; 1737b411b363SPhilipp Reisner u32 dp_flags; 1738b411b363SPhilipp Reisner 1739b411b363SPhilipp Reisner if (!get_ldev(mdev)) { 1740b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 1741b411b363SPhilipp Reisner if (mdev->peer_seq+1 == be32_to_cpu(p->seq_num)) 1742b411b363SPhilipp Reisner mdev->peer_seq++; 1743b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 1744b411b363SPhilipp Reisner 17452b2bf214SLars Ellenberg drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size); 1746b411b363SPhilipp Reisner atomic_inc(&mdev->current_epoch->epoch_size); 1747b411b363SPhilipp Reisner return drbd_drain_block(mdev, data_size); 1748b411b363SPhilipp Reisner } 1749b411b363SPhilipp Reisner 1750b411b363SPhilipp Reisner /* get_ldev(mdev) successful. 1751b411b363SPhilipp Reisner * Corresponding put_ldev done either below (on various errors), 17529c50842aSAndreas Gruenbacher * or in drbd_endio_sec, if we successfully submit the data at 1753b411b363SPhilipp Reisner * the end of this function. */ 1754b411b363SPhilipp Reisner 1755b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 1756b411b363SPhilipp Reisner e = read_in_block(mdev, p->block_id, sector, data_size); 1757b411b363SPhilipp Reisner if (!e) { 1758b411b363SPhilipp Reisner put_ldev(mdev); 175981e84650SAndreas Gruenbacher return false; 1760b411b363SPhilipp Reisner } 1761b411b363SPhilipp Reisner 1762b411b363SPhilipp Reisner e->w.cb = e_end_block; 1763b411b363SPhilipp Reisner 1764688593c5SLars Ellenberg dp_flags = be32_to_cpu(p->dp_flags); 1765688593c5SLars Ellenberg rw |= wire_flags_to_bio(mdev, dp_flags); 1766688593c5SLars Ellenberg 1767688593c5SLars Ellenberg if (dp_flags & DP_MAY_SET_IN_SYNC) 1768688593c5SLars Ellenberg e->flags |= EE_MAY_SET_IN_SYNC; 1769688593c5SLars Ellenberg 1770b411b363SPhilipp Reisner spin_lock(&mdev->epoch_lock); 1771b411b363SPhilipp Reisner e->epoch = mdev->current_epoch; 1772b411b363SPhilipp Reisner atomic_inc(&e->epoch->epoch_size); 1773b411b363SPhilipp Reisner atomic_inc(&e->epoch->active); 1774b411b363SPhilipp Reisner spin_unlock(&mdev->epoch_lock); 1775b411b363SPhilipp Reisner 1776b411b363SPhilipp Reisner /* I'm the receiver, I do hold a net_cnt reference. */ 177789e58e75SPhilipp Reisner if (!mdev->tconn->net_conf->two_primaries) { 177887eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1779b411b363SPhilipp Reisner } else { 1780b411b363SPhilipp Reisner /* don't get the req_lock yet, 1781b411b363SPhilipp Reisner * we may sleep in drbd_wait_peer_seq */ 1782010f6e67SAndreas Gruenbacher const int size = e->i.size; 1783b411b363SPhilipp Reisner const int discard = test_bit(DISCARD_CONCURRENT, &mdev->flags); 1784b411b363SPhilipp Reisner DEFINE_WAIT(wait); 1785b411b363SPhilipp Reisner int first; 1786b411b363SPhilipp Reisner 178789e58e75SPhilipp Reisner D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C); 1788b411b363SPhilipp Reisner 1789b411b363SPhilipp Reisner /* conflict detection and handling: 1790b411b363SPhilipp Reisner * 1. wait on the sequence number, 1791b411b363SPhilipp Reisner * in case this data packet overtook ACK packets. 17925e472264SAndreas Gruenbacher * 2. check for conflicting write requests. 1793b411b363SPhilipp Reisner * 1794b411b363SPhilipp Reisner * Note: for two_primaries, we are protocol C, 1795b411b363SPhilipp Reisner * so there cannot be any request that is DONE 1796b411b363SPhilipp Reisner * but still on the transfer log. 1797b411b363SPhilipp Reisner * 1798b411b363SPhilipp Reisner * if no conflicting request is found: 1799b411b363SPhilipp Reisner * submit. 1800b411b363SPhilipp Reisner * 1801b411b363SPhilipp Reisner * if any conflicting request is found 1802b411b363SPhilipp Reisner * that has not yet been acked, 1803b411b363SPhilipp Reisner * AND I have the "discard concurrent writes" flag: 1804b411b363SPhilipp Reisner * queue (via done_ee) the P_DISCARD_ACK; OUT. 1805b411b363SPhilipp Reisner * 1806b411b363SPhilipp Reisner * if any conflicting request is found: 1807b411b363SPhilipp Reisner * block the receiver, waiting on misc_wait 1808b411b363SPhilipp Reisner * until no more conflicting requests are there, 1809b411b363SPhilipp Reisner * or we get interrupted (disconnect). 1810b411b363SPhilipp Reisner * 1811b411b363SPhilipp Reisner * we do not just write after local io completion of those 1812b411b363SPhilipp Reisner * requests, but only after req is done completely, i.e. 1813b411b363SPhilipp Reisner * we wait for the P_DISCARD_ACK to arrive! 1814b411b363SPhilipp Reisner * 1815b411b363SPhilipp Reisner * then proceed normally, i.e. submit. 1816b411b363SPhilipp Reisner */ 1817b411b363SPhilipp Reisner if (drbd_wait_peer_seq(mdev, be32_to_cpu(p->seq_num))) 1818b411b363SPhilipp Reisner goto out_interrupted; 1819b411b363SPhilipp Reisner 182087eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1821b411b363SPhilipp Reisner 1822b411b363SPhilipp Reisner first = 1; 1823b411b363SPhilipp Reisner for (;;) { 1824de696716SAndreas Gruenbacher struct drbd_interval *i; 1825b411b363SPhilipp Reisner int have_unacked = 0; 1826b411b363SPhilipp Reisner int have_conflict = 0; 1827b411b363SPhilipp Reisner prepare_to_wait(&mdev->misc_wait, &wait, 1828b411b363SPhilipp Reisner TASK_INTERRUPTIBLE); 1829de696716SAndreas Gruenbacher 1830de696716SAndreas Gruenbacher i = drbd_find_overlap(&mdev->write_requests, sector, size); 1831de696716SAndreas Gruenbacher if (i) { 1832b411b363SPhilipp Reisner /* only ALERT on first iteration, 1833b411b363SPhilipp Reisner * we may be woken up early... */ 1834b411b363SPhilipp Reisner if (first) 18355e472264SAndreas Gruenbacher dev_alert(DEV, "%s[%u] Concurrent %s write detected!" 1836b411b363SPhilipp Reisner " new: %llus +%u; pending: %llus +%u\n", 1837b411b363SPhilipp Reisner current->comm, current->pid, 18385e472264SAndreas Gruenbacher i->local ? "local" : "remote", 1839b411b363SPhilipp Reisner (unsigned long long)sector, size, 18405e472264SAndreas Gruenbacher (unsigned long long)i->sector, i->size); 18415e472264SAndreas Gruenbacher 18425e472264SAndreas Gruenbacher if (i->local) { 18435e472264SAndreas Gruenbacher struct drbd_request *req2; 18445e472264SAndreas Gruenbacher 18455e472264SAndreas Gruenbacher req2 = container_of(i, struct drbd_request, i); 1846de696716SAndreas Gruenbacher if (req2->rq_state & RQ_NET_PENDING) 1847b411b363SPhilipp Reisner ++have_unacked; 18485e472264SAndreas Gruenbacher } 1849b411b363SPhilipp Reisner ++have_conflict; 1850b411b363SPhilipp Reisner } 1851b411b363SPhilipp Reisner if (!have_conflict) 1852b411b363SPhilipp Reisner break; 1853b411b363SPhilipp Reisner 1854b411b363SPhilipp Reisner /* Discard Ack only for the _first_ iteration */ 1855b411b363SPhilipp Reisner if (first && discard && have_unacked) { 1856b411b363SPhilipp Reisner dev_alert(DEV, "Concurrent write! [DISCARD BY FLAG] sec=%llus\n", 1857b411b363SPhilipp Reisner (unsigned long long)sector); 1858b411b363SPhilipp Reisner inc_unacked(mdev); 1859b411b363SPhilipp Reisner e->w.cb = e_send_discard_ack; 1860b411b363SPhilipp Reisner list_add_tail(&e->w.list, &mdev->done_ee); 1861b411b363SPhilipp Reisner 186287eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1863b411b363SPhilipp Reisner 1864b411b363SPhilipp Reisner /* we could probably send that P_DISCARD_ACK ourselves, 1865b411b363SPhilipp Reisner * but I don't like the receiver using the msock */ 1866b411b363SPhilipp Reisner 1867b411b363SPhilipp Reisner put_ldev(mdev); 1868b411b363SPhilipp Reisner wake_asender(mdev); 1869b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 187081e84650SAndreas Gruenbacher return true; 1871b411b363SPhilipp Reisner } 1872b411b363SPhilipp Reisner 1873b411b363SPhilipp Reisner if (signal_pending(current)) { 187487eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1875b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 1876b411b363SPhilipp Reisner goto out_interrupted; 1877b411b363SPhilipp Reisner } 1878b411b363SPhilipp Reisner 1879a500c2efSAndreas Gruenbacher /* Indicate to wake up mdev->misc_wait upon completion. */ 188053840641SAndreas Gruenbacher i->waiting = true; 1881a500c2efSAndreas Gruenbacher 188287eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1883b411b363SPhilipp Reisner if (first) { 1884b411b363SPhilipp Reisner first = 0; 1885b411b363SPhilipp Reisner dev_alert(DEV, "Concurrent write! [W AFTERWARDS] " 1886b411b363SPhilipp Reisner "sec=%llus\n", (unsigned long long)sector); 1887b411b363SPhilipp Reisner } else if (discard) { 1888b411b363SPhilipp Reisner /* we had none on the first iteration. 1889b411b363SPhilipp Reisner * there must be none now. */ 1890b411b363SPhilipp Reisner D_ASSERT(have_unacked == 0); 1891b411b363SPhilipp Reisner } 1892b411b363SPhilipp Reisner schedule(); 189387eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 1894b411b363SPhilipp Reisner } 1895b411b363SPhilipp Reisner finish_wait(&mdev->misc_wait, &wait); 18965e472264SAndreas Gruenbacher 18975e472264SAndreas Gruenbacher drbd_insert_interval(&mdev->write_requests, &e->i); 1898b411b363SPhilipp Reisner } 1899b411b363SPhilipp Reisner 1900b411b363SPhilipp Reisner list_add(&e->w.list, &mdev->active_ee); 190187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 1902b411b363SPhilipp Reisner 190389e58e75SPhilipp Reisner switch (mdev->tconn->net_conf->wire_protocol) { 1904b411b363SPhilipp Reisner case DRBD_PROT_C: 1905b411b363SPhilipp Reisner inc_unacked(mdev); 1906b411b363SPhilipp Reisner /* corresponding dec_unacked() in e_end_block() 1907b411b363SPhilipp Reisner * respective _drbd_clear_done_ee */ 1908b411b363SPhilipp Reisner break; 1909b411b363SPhilipp Reisner case DRBD_PROT_B: 1910b411b363SPhilipp Reisner /* I really don't like it that the receiver thread 1911b411b363SPhilipp Reisner * sends on the msock, but anyways */ 1912b411b363SPhilipp Reisner drbd_send_ack(mdev, P_RECV_ACK, e); 1913b411b363SPhilipp Reisner break; 1914b411b363SPhilipp Reisner case DRBD_PROT_A: 1915b411b363SPhilipp Reisner /* nothing to do */ 1916b411b363SPhilipp Reisner break; 1917b411b363SPhilipp Reisner } 1918b411b363SPhilipp Reisner 19196719fb03SLars Ellenberg if (mdev->state.pdsk < D_INCONSISTENT) { 1920b411b363SPhilipp Reisner /* In case we have the only disk of the cluster, */ 1921010f6e67SAndreas Gruenbacher drbd_set_out_of_sync(mdev, e->i.sector, e->i.size); 1922b411b363SPhilipp Reisner e->flags |= EE_CALL_AL_COMPLETE_IO; 19236719fb03SLars Ellenberg e->flags &= ~EE_MAY_SET_IN_SYNC; 1924010f6e67SAndreas Gruenbacher drbd_al_begin_io(mdev, e->i.sector); 1925b411b363SPhilipp Reisner } 1926b411b363SPhilipp Reisner 192745bb912bSLars Ellenberg if (drbd_submit_ee(mdev, e, rw, DRBD_FAULT_DT_WR) == 0) 192881e84650SAndreas Gruenbacher return true; 1929b411b363SPhilipp Reisner 193010f6d992SLars Ellenberg /* don't care for the reason here */ 193110f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 193287eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 193322cc37a9SLars Ellenberg list_del(&e->w.list); 193453840641SAndreas Gruenbacher drbd_remove_epoch_entry_interval(mdev, e); 193587eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 193622cc37a9SLars Ellenberg if (e->flags & EE_CALL_AL_COMPLETE_IO) 1937010f6e67SAndreas Gruenbacher drbd_al_complete_io(mdev, e->i.sector); 193822cc37a9SLars Ellenberg 1939b411b363SPhilipp Reisner out_interrupted: 194010f6d992SLars Ellenberg drbd_may_finish_epoch(mdev, e->epoch, EV_PUT + EV_CLEANUP); 1941b411b363SPhilipp Reisner put_ldev(mdev); 1942b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 194381e84650SAndreas Gruenbacher return false; 1944b411b363SPhilipp Reisner } 1945b411b363SPhilipp Reisner 19460f0601f4SLars Ellenberg /* We may throttle resync, if the lower device seems to be busy, 19470f0601f4SLars Ellenberg * and current sync rate is above c_min_rate. 19480f0601f4SLars Ellenberg * 19490f0601f4SLars Ellenberg * To decide whether or not the lower device is busy, we use a scheme similar 19500f0601f4SLars Ellenberg * to MD RAID is_mddev_idle(): if the partition stats reveal "significant" 19510f0601f4SLars Ellenberg * (more than 64 sectors) of activity we cannot account for with our own resync 19520f0601f4SLars Ellenberg * activity, it obviously is "busy". 19530f0601f4SLars Ellenberg * 19540f0601f4SLars Ellenberg * The current sync rate used here uses only the most recent two step marks, 19550f0601f4SLars Ellenberg * to have a short time average so we can react faster. 19560f0601f4SLars Ellenberg */ 1957e3555d85SPhilipp Reisner int drbd_rs_should_slow_down(struct drbd_conf *mdev, sector_t sector) 19580f0601f4SLars Ellenberg { 19590f0601f4SLars Ellenberg struct gendisk *disk = mdev->ldev->backing_bdev->bd_contains->bd_disk; 19600f0601f4SLars Ellenberg unsigned long db, dt, dbdt; 1961e3555d85SPhilipp Reisner struct lc_element *tmp; 19620f0601f4SLars Ellenberg int curr_events; 19630f0601f4SLars Ellenberg int throttle = 0; 19640f0601f4SLars Ellenberg 19650f0601f4SLars Ellenberg /* feature disabled? */ 19660f0601f4SLars Ellenberg if (mdev->sync_conf.c_min_rate == 0) 19670f0601f4SLars Ellenberg return 0; 19680f0601f4SLars Ellenberg 1969e3555d85SPhilipp Reisner spin_lock_irq(&mdev->al_lock); 1970e3555d85SPhilipp Reisner tmp = lc_find(mdev->resync, BM_SECT_TO_EXT(sector)); 1971e3555d85SPhilipp Reisner if (tmp) { 1972e3555d85SPhilipp Reisner struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); 1973e3555d85SPhilipp Reisner if (test_bit(BME_PRIORITY, &bm_ext->flags)) { 1974e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 1975e3555d85SPhilipp Reisner return 0; 1976e3555d85SPhilipp Reisner } 1977e3555d85SPhilipp Reisner /* Do not slow down if app IO is already waiting for this extent */ 1978e3555d85SPhilipp Reisner } 1979e3555d85SPhilipp Reisner spin_unlock_irq(&mdev->al_lock); 1980e3555d85SPhilipp Reisner 19810f0601f4SLars Ellenberg curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + 19820f0601f4SLars Ellenberg (int)part_stat_read(&disk->part0, sectors[1]) - 19830f0601f4SLars Ellenberg atomic_read(&mdev->rs_sect_ev); 1984e3555d85SPhilipp Reisner 19850f0601f4SLars Ellenberg if (!mdev->rs_last_events || curr_events - mdev->rs_last_events > 64) { 19860f0601f4SLars Ellenberg unsigned long rs_left; 19870f0601f4SLars Ellenberg int i; 19880f0601f4SLars Ellenberg 19890f0601f4SLars Ellenberg mdev->rs_last_events = curr_events; 19900f0601f4SLars Ellenberg 19910f0601f4SLars Ellenberg /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, 19920f0601f4SLars Ellenberg * approx. */ 19932649f080SLars Ellenberg i = (mdev->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; 19942649f080SLars Ellenberg 19952649f080SLars Ellenberg if (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T) 19962649f080SLars Ellenberg rs_left = mdev->ov_left; 19972649f080SLars Ellenberg else 19980f0601f4SLars Ellenberg rs_left = drbd_bm_total_weight(mdev) - mdev->rs_failed; 19990f0601f4SLars Ellenberg 20000f0601f4SLars Ellenberg dt = ((long)jiffies - (long)mdev->rs_mark_time[i]) / HZ; 20010f0601f4SLars Ellenberg if (!dt) 20020f0601f4SLars Ellenberg dt++; 20030f0601f4SLars Ellenberg db = mdev->rs_mark_left[i] - rs_left; 20040f0601f4SLars Ellenberg dbdt = Bit2KB(db/dt); 20050f0601f4SLars Ellenberg 20060f0601f4SLars Ellenberg if (dbdt > mdev->sync_conf.c_min_rate) 20070f0601f4SLars Ellenberg throttle = 1; 20080f0601f4SLars Ellenberg } 20090f0601f4SLars Ellenberg return throttle; 20100f0601f4SLars Ellenberg } 20110f0601f4SLars Ellenberg 20120f0601f4SLars Ellenberg 2013d8763023SAndreas Gruenbacher static int receive_DataRequest(struct drbd_conf *mdev, enum drbd_packet cmd, 2014d8763023SAndreas Gruenbacher unsigned int digest_size) 2015b411b363SPhilipp Reisner { 2016b411b363SPhilipp Reisner sector_t sector; 2017b411b363SPhilipp Reisner const sector_t capacity = drbd_get_capacity(mdev->this_bdev); 2018f6ffca9fSAndreas Gruenbacher struct drbd_peer_request *e; 2019b411b363SPhilipp Reisner struct digest_info *di = NULL; 2020b18b37beSPhilipp Reisner int size, verb; 2021b411b363SPhilipp Reisner unsigned int fault_type; 2022e42325a5SPhilipp Reisner struct p_block_req *p = &mdev->tconn->data.rbuf.block_req; 2023b411b363SPhilipp Reisner 2024b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 2025b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 2026b411b363SPhilipp Reisner 20271816a2b4SLars Ellenberg if (size <= 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_BIO_SIZE) { 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 if (sector + (size>>9) > capacity) { 2033b411b363SPhilipp Reisner dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, 2034b411b363SPhilipp Reisner (unsigned long long)sector, size); 203581e84650SAndreas Gruenbacher return false; 2036b411b363SPhilipp Reisner } 2037b411b363SPhilipp Reisner 2038b411b363SPhilipp Reisner if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) { 2039b18b37beSPhilipp Reisner verb = 1; 2040b18b37beSPhilipp Reisner switch (cmd) { 2041b18b37beSPhilipp Reisner case P_DATA_REQUEST: 2042b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_DREPLY, p); 2043b18b37beSPhilipp Reisner break; 2044b18b37beSPhilipp Reisner case P_RS_DATA_REQUEST: 2045b18b37beSPhilipp Reisner case P_CSUM_RS_REQUEST: 2046b18b37beSPhilipp Reisner case P_OV_REQUEST: 2047b18b37beSPhilipp Reisner drbd_send_ack_rp(mdev, P_NEG_RS_DREPLY , p); 2048b18b37beSPhilipp Reisner break; 2049b18b37beSPhilipp Reisner case P_OV_REPLY: 2050b18b37beSPhilipp Reisner verb = 0; 2051b18b37beSPhilipp Reisner dec_rs_pending(mdev); 2052b18b37beSPhilipp Reisner drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, ID_IN_SYNC); 2053b18b37beSPhilipp Reisner break; 2054b18b37beSPhilipp Reisner default: 2055b18b37beSPhilipp Reisner dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n", 2056b18b37beSPhilipp Reisner cmdname(cmd)); 2057b18b37beSPhilipp Reisner } 2058b18b37beSPhilipp Reisner if (verb && __ratelimit(&drbd_ratelimit_state)) 2059b411b363SPhilipp Reisner dev_err(DEV, "Can not satisfy peer's read request, " 2060b411b363SPhilipp Reisner "no local data.\n"); 2061b18b37beSPhilipp Reisner 2062a821cc4aSLars Ellenberg /* drain possibly payload */ 2063a821cc4aSLars Ellenberg return drbd_drain_block(mdev, digest_size); 2064b411b363SPhilipp Reisner } 2065b411b363SPhilipp Reisner 2066b411b363SPhilipp Reisner /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD 2067b411b363SPhilipp Reisner * "criss-cross" setup, that might cause write-out on some other DRBD, 2068b411b363SPhilipp Reisner * which in turn might block on the other node at this very place. */ 2069b411b363SPhilipp Reisner e = drbd_alloc_ee(mdev, p->block_id, sector, size, GFP_NOIO); 2070b411b363SPhilipp Reisner if (!e) { 2071b411b363SPhilipp Reisner put_ldev(mdev); 207281e84650SAndreas Gruenbacher return false; 2073b411b363SPhilipp Reisner } 2074b411b363SPhilipp Reisner 207502918be2SPhilipp Reisner switch (cmd) { 2076b411b363SPhilipp Reisner case P_DATA_REQUEST: 2077b411b363SPhilipp Reisner e->w.cb = w_e_end_data_req; 2078b411b363SPhilipp Reisner fault_type = DRBD_FAULT_DT_RD; 207980a40e43SLars Ellenberg /* application IO, don't drbd_rs_begin_io */ 208080a40e43SLars Ellenberg goto submit; 208180a40e43SLars Ellenberg 2082b411b363SPhilipp Reisner case P_RS_DATA_REQUEST: 2083b411b363SPhilipp Reisner e->w.cb = w_e_end_rsdata_req; 2084b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 20855f9915bbSLars Ellenberg /* used in the sector offset progress display */ 20865f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 2087b411b363SPhilipp Reisner break; 2088b411b363SPhilipp Reisner 2089b411b363SPhilipp Reisner case P_OV_REPLY: 2090b411b363SPhilipp Reisner case P_CSUM_RS_REQUEST: 2091b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2092b411b363SPhilipp Reisner di = kmalloc(sizeof(*di) + digest_size, GFP_NOIO); 2093b411b363SPhilipp Reisner if (!di) 2094b411b363SPhilipp Reisner goto out_free_e; 2095b411b363SPhilipp Reisner 2096b411b363SPhilipp Reisner di->digest_size = digest_size; 2097b411b363SPhilipp Reisner di->digest = (((char *)di)+sizeof(struct digest_info)); 2098b411b363SPhilipp Reisner 2099c36c3cedSLars Ellenberg e->digest = di; 2100c36c3cedSLars Ellenberg e->flags |= EE_HAS_DIGEST; 2101c36c3cedSLars Ellenberg 2102b411b363SPhilipp Reisner if (drbd_recv(mdev, di->digest, digest_size) != digest_size) 2103b411b363SPhilipp Reisner goto out_free_e; 2104b411b363SPhilipp Reisner 210502918be2SPhilipp Reisner if (cmd == P_CSUM_RS_REQUEST) { 210631890f4aSPhilipp Reisner D_ASSERT(mdev->tconn->agreed_pro_version >= 89); 2107b411b363SPhilipp Reisner e->w.cb = w_e_end_csum_rs_req; 21085f9915bbSLars Ellenberg /* used in the sector offset progress display */ 21095f9915bbSLars Ellenberg mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); 211002918be2SPhilipp Reisner } else if (cmd == P_OV_REPLY) { 21112649f080SLars Ellenberg /* track progress, we may need to throttle */ 21122649f080SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_in); 2113b411b363SPhilipp Reisner e->w.cb = w_e_end_ov_reply; 2114b411b363SPhilipp Reisner dec_rs_pending(mdev); 21150f0601f4SLars Ellenberg /* drbd_rs_begin_io done when we sent this request, 21160f0601f4SLars Ellenberg * but accounting still needs to be done. */ 21170f0601f4SLars Ellenberg goto submit_for_resync; 2118b411b363SPhilipp Reisner } 2119b411b363SPhilipp Reisner break; 2120b411b363SPhilipp Reisner 2121b411b363SPhilipp Reisner case P_OV_REQUEST: 2122b411b363SPhilipp Reisner if (mdev->ov_start_sector == ~(sector_t)0 && 212331890f4aSPhilipp Reisner mdev->tconn->agreed_pro_version >= 90) { 2124de228bbaSLars Ellenberg unsigned long now = jiffies; 2125de228bbaSLars Ellenberg int i; 2126b411b363SPhilipp Reisner mdev->ov_start_sector = sector; 2127b411b363SPhilipp Reisner mdev->ov_position = sector; 212830b743a2SLars Ellenberg mdev->ov_left = drbd_bm_bits(mdev) - BM_SECT_TO_BIT(sector); 212930b743a2SLars Ellenberg mdev->rs_total = mdev->ov_left; 2130de228bbaSLars Ellenberg for (i = 0; i < DRBD_SYNC_MARKS; i++) { 2131de228bbaSLars Ellenberg mdev->rs_mark_left[i] = mdev->ov_left; 2132de228bbaSLars Ellenberg mdev->rs_mark_time[i] = now; 2133de228bbaSLars Ellenberg } 2134b411b363SPhilipp Reisner dev_info(DEV, "Online Verify start sector: %llu\n", 2135b411b363SPhilipp Reisner (unsigned long long)sector); 2136b411b363SPhilipp Reisner } 2137b411b363SPhilipp Reisner e->w.cb = w_e_end_ov_req; 2138b411b363SPhilipp Reisner fault_type = DRBD_FAULT_RS_RD; 2139b411b363SPhilipp Reisner break; 2140b411b363SPhilipp Reisner 2141b411b363SPhilipp Reisner default: 2142b411b363SPhilipp Reisner dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n", 214302918be2SPhilipp Reisner cmdname(cmd)); 2144b411b363SPhilipp Reisner fault_type = DRBD_FAULT_MAX; 214580a40e43SLars Ellenberg goto out_free_e; 2146b411b363SPhilipp Reisner } 2147b411b363SPhilipp Reisner 21480f0601f4SLars Ellenberg /* Throttle, drbd_rs_begin_io and submit should become asynchronous 21490f0601f4SLars Ellenberg * wrt the receiver, but it is not as straightforward as it may seem. 21500f0601f4SLars Ellenberg * Various places in the resync start and stop logic assume resync 21510f0601f4SLars Ellenberg * requests are processed in order, requeuing this on the worker thread 21520f0601f4SLars Ellenberg * introduces a bunch of new code for synchronization between threads. 21530f0601f4SLars Ellenberg * 21540f0601f4SLars Ellenberg * Unlimited throttling before drbd_rs_begin_io may stall the resync 21550f0601f4SLars Ellenberg * "forever", throttling after drbd_rs_begin_io will lock that extent 21560f0601f4SLars Ellenberg * for application writes for the same time. For now, just throttle 21570f0601f4SLars Ellenberg * here, where the rest of the code expects the receiver to sleep for 21580f0601f4SLars Ellenberg * a while, anyways. 21590f0601f4SLars Ellenberg */ 2160b411b363SPhilipp Reisner 21610f0601f4SLars Ellenberg /* Throttle before drbd_rs_begin_io, as that locks out application IO; 21620f0601f4SLars Ellenberg * this defers syncer requests for some time, before letting at least 21630f0601f4SLars Ellenberg * on request through. The resync controller on the receiving side 21640f0601f4SLars Ellenberg * will adapt to the incoming rate accordingly. 21650f0601f4SLars Ellenberg * 21660f0601f4SLars Ellenberg * We cannot throttle here if remote is Primary/SyncTarget: 21670f0601f4SLars Ellenberg * we would also throttle its application reads. 21680f0601f4SLars Ellenberg * In that case, throttling is done on the SyncTarget only. 21690f0601f4SLars Ellenberg */ 2170e3555d85SPhilipp Reisner if (mdev->state.peer != R_PRIMARY && drbd_rs_should_slow_down(mdev, sector)) 2171e3555d85SPhilipp Reisner schedule_timeout_uninterruptible(HZ/10); 2172e3555d85SPhilipp Reisner if (drbd_rs_begin_io(mdev, sector)) 217380a40e43SLars Ellenberg goto out_free_e; 2174b411b363SPhilipp Reisner 21750f0601f4SLars Ellenberg submit_for_resync: 21760f0601f4SLars Ellenberg atomic_add(size >> 9, &mdev->rs_sect_ev); 21770f0601f4SLars Ellenberg 217880a40e43SLars Ellenberg submit: 2179b411b363SPhilipp Reisner inc_unacked(mdev); 218087eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 218180a40e43SLars Ellenberg list_add_tail(&e->w.list, &mdev->read_ee); 218287eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 2183b411b363SPhilipp Reisner 218445bb912bSLars Ellenberg if (drbd_submit_ee(mdev, e, READ, fault_type) == 0) 218581e84650SAndreas Gruenbacher return true; 2186b411b363SPhilipp Reisner 218710f6d992SLars Ellenberg /* don't care for the reason here */ 218810f6d992SLars Ellenberg dev_err(DEV, "submit failed, triggering re-connect\n"); 218987eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 219022cc37a9SLars Ellenberg list_del(&e->w.list); 219187eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 219222cc37a9SLars Ellenberg /* no drbd_rs_complete_io(), we are dropping the connection anyways */ 219322cc37a9SLars Ellenberg 2194b411b363SPhilipp Reisner out_free_e: 2195b411b363SPhilipp Reisner put_ldev(mdev); 2196b411b363SPhilipp Reisner drbd_free_ee(mdev, e); 219781e84650SAndreas Gruenbacher return false; 2198b411b363SPhilipp Reisner } 2199b411b363SPhilipp Reisner 2200b411b363SPhilipp Reisner static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local) 2201b411b363SPhilipp Reisner { 2202b411b363SPhilipp Reisner int self, peer, rv = -100; 2203b411b363SPhilipp Reisner unsigned long ch_self, ch_peer; 2204b411b363SPhilipp Reisner 2205b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & 1; 2206b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & 1; 2207b411b363SPhilipp Reisner 2208b411b363SPhilipp Reisner ch_peer = mdev->p_uuid[UI_SIZE]; 2209b411b363SPhilipp Reisner ch_self = mdev->comm_bm_set; 2210b411b363SPhilipp Reisner 221189e58e75SPhilipp Reisner switch (mdev->tconn->net_conf->after_sb_0p) { 2212b411b363SPhilipp Reisner case ASB_CONSENSUS: 2213b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2214b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2215b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2216b411b363SPhilipp Reisner break; 2217b411b363SPhilipp Reisner case ASB_DISCONNECT: 2218b411b363SPhilipp Reisner break; 2219b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2220b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2221b411b363SPhilipp Reisner rv = -1; 2222b411b363SPhilipp Reisner break; 2223b411b363SPhilipp Reisner } 2224b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2225b411b363SPhilipp Reisner rv = 1; 2226b411b363SPhilipp Reisner break; 2227b411b363SPhilipp Reisner } 2228b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2229b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2230b411b363SPhilipp Reisner if (self == 0 && peer == 1) { 2231b411b363SPhilipp Reisner rv = 1; 2232b411b363SPhilipp Reisner break; 2233b411b363SPhilipp Reisner } 2234b411b363SPhilipp Reisner if (self == 1 && peer == 0) { 2235b411b363SPhilipp Reisner rv = -1; 2236b411b363SPhilipp Reisner break; 2237b411b363SPhilipp Reisner } 2238b411b363SPhilipp Reisner /* Else fall through to one of the other strategies... */ 2239ad19bf6eSLars Ellenberg dev_warn(DEV, "Discard younger/older primary did not find a decision\n" 2240b411b363SPhilipp Reisner "Using discard-least-changes instead\n"); 2241b411b363SPhilipp Reisner case ASB_DISCARD_ZERO_CHG: 2242b411b363SPhilipp Reisner if (ch_peer == 0 && ch_self == 0) { 2243b411b363SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->flags) 2244b411b363SPhilipp Reisner ? -1 : 1; 2245b411b363SPhilipp Reisner break; 2246b411b363SPhilipp Reisner } else { 2247b411b363SPhilipp Reisner if (ch_peer == 0) { rv = 1; break; } 2248b411b363SPhilipp Reisner if (ch_self == 0) { rv = -1; break; } 2249b411b363SPhilipp Reisner } 225089e58e75SPhilipp Reisner if (mdev->tconn->net_conf->after_sb_0p == ASB_DISCARD_ZERO_CHG) 2251b411b363SPhilipp Reisner break; 2252b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2253b411b363SPhilipp Reisner if (ch_self < ch_peer) 2254b411b363SPhilipp Reisner rv = -1; 2255b411b363SPhilipp Reisner else if (ch_self > ch_peer) 2256b411b363SPhilipp Reisner rv = 1; 2257b411b363SPhilipp Reisner else /* ( ch_self == ch_peer ) */ 2258b411b363SPhilipp Reisner /* Well, then use something else. */ 2259b411b363SPhilipp Reisner rv = test_bit(DISCARD_CONCURRENT, &mdev->flags) 2260b411b363SPhilipp Reisner ? -1 : 1; 2261b411b363SPhilipp Reisner break; 2262b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2263b411b363SPhilipp Reisner rv = -1; 2264b411b363SPhilipp Reisner break; 2265b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2266b411b363SPhilipp Reisner rv = 1; 2267b411b363SPhilipp Reisner } 2268b411b363SPhilipp Reisner 2269b411b363SPhilipp Reisner return rv; 2270b411b363SPhilipp Reisner } 2271b411b363SPhilipp Reisner 2272b411b363SPhilipp Reisner static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local) 2273b411b363SPhilipp Reisner { 22746184ea21SAndreas Gruenbacher int hg, rv = -100; 2275b411b363SPhilipp Reisner 227689e58e75SPhilipp Reisner switch (mdev->tconn->net_conf->after_sb_1p) { 2277b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2278b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2279b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2280b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2281b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2282b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2283b411b363SPhilipp Reisner break; 2284b411b363SPhilipp Reisner case ASB_DISCONNECT: 2285b411b363SPhilipp Reisner break; 2286b411b363SPhilipp Reisner case ASB_CONSENSUS: 2287b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2288b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_SECONDARY) 2289b411b363SPhilipp Reisner rv = hg; 2290b411b363SPhilipp Reisner if (hg == 1 && mdev->state.role == R_PRIMARY) 2291b411b363SPhilipp Reisner rv = hg; 2292b411b363SPhilipp Reisner break; 2293b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2294b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2295b411b363SPhilipp Reisner break; 2296b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2297b411b363SPhilipp Reisner return mdev->state.role == R_PRIMARY ? 1 : -1; 2298b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2299b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2300b411b363SPhilipp Reisner if (hg == -1 && mdev->state.role == R_PRIMARY) { 2301bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2302bb437946SAndreas Gruenbacher 2303bb437946SAndreas Gruenbacher drbd_set_role(mdev, R_SECONDARY, 0); 2304b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2305b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2306b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2307bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2308bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2309b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2310b411b363SPhilipp Reisner } else { 2311b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2312b411b363SPhilipp Reisner rv = hg; 2313b411b363SPhilipp Reisner } 2314b411b363SPhilipp Reisner } else 2315b411b363SPhilipp Reisner rv = hg; 2316b411b363SPhilipp Reisner } 2317b411b363SPhilipp Reisner 2318b411b363SPhilipp Reisner return rv; 2319b411b363SPhilipp Reisner } 2320b411b363SPhilipp Reisner 2321b411b363SPhilipp Reisner static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local) 2322b411b363SPhilipp Reisner { 23236184ea21SAndreas Gruenbacher int hg, rv = -100; 2324b411b363SPhilipp Reisner 232589e58e75SPhilipp Reisner switch (mdev->tconn->net_conf->after_sb_2p) { 2326b411b363SPhilipp Reisner case ASB_DISCARD_YOUNGER_PRI: 2327b411b363SPhilipp Reisner case ASB_DISCARD_OLDER_PRI: 2328b411b363SPhilipp Reisner case ASB_DISCARD_LEAST_CHG: 2329b411b363SPhilipp Reisner case ASB_DISCARD_LOCAL: 2330b411b363SPhilipp Reisner case ASB_DISCARD_REMOTE: 2331b411b363SPhilipp Reisner case ASB_CONSENSUS: 2332b411b363SPhilipp Reisner case ASB_DISCARD_SECONDARY: 2333b411b363SPhilipp Reisner dev_err(DEV, "Configuration error.\n"); 2334b411b363SPhilipp Reisner break; 2335b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2336b411b363SPhilipp Reisner rv = drbd_asb_recover_0p(mdev); 2337b411b363SPhilipp Reisner break; 2338b411b363SPhilipp Reisner case ASB_DISCONNECT: 2339b411b363SPhilipp Reisner break; 2340b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2341b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2342b411b363SPhilipp Reisner if (hg == -1) { 2343bb437946SAndreas Gruenbacher enum drbd_state_rv rv2; 2344bb437946SAndreas Gruenbacher 2345b411b363SPhilipp Reisner /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, 2346b411b363SPhilipp Reisner * we might be here in C_WF_REPORT_PARAMS which is transient. 2347b411b363SPhilipp Reisner * we do not need to wait for the after state change work either. */ 2348bb437946SAndreas Gruenbacher rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); 2349bb437946SAndreas Gruenbacher if (rv2 != SS_SUCCESS) { 2350b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost-after-sb"); 2351b411b363SPhilipp Reisner } else { 2352b411b363SPhilipp Reisner dev_warn(DEV, "Successfully gave up primary role.\n"); 2353b411b363SPhilipp Reisner rv = hg; 2354b411b363SPhilipp Reisner } 2355b411b363SPhilipp Reisner } else 2356b411b363SPhilipp Reisner rv = hg; 2357b411b363SPhilipp Reisner } 2358b411b363SPhilipp Reisner 2359b411b363SPhilipp Reisner return rv; 2360b411b363SPhilipp Reisner } 2361b411b363SPhilipp Reisner 2362b411b363SPhilipp Reisner static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid, 2363b411b363SPhilipp Reisner u64 bits, u64 flags) 2364b411b363SPhilipp Reisner { 2365b411b363SPhilipp Reisner if (!uuid) { 2366b411b363SPhilipp Reisner dev_info(DEV, "%s uuid info vanished while I was looking!\n", text); 2367b411b363SPhilipp Reisner return; 2368b411b363SPhilipp Reisner } 2369b411b363SPhilipp Reisner dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", 2370b411b363SPhilipp Reisner text, 2371b411b363SPhilipp Reisner (unsigned long long)uuid[UI_CURRENT], 2372b411b363SPhilipp Reisner (unsigned long long)uuid[UI_BITMAP], 2373b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_START], 2374b411b363SPhilipp Reisner (unsigned long long)uuid[UI_HISTORY_END], 2375b411b363SPhilipp Reisner (unsigned long long)bits, 2376b411b363SPhilipp Reisner (unsigned long long)flags); 2377b411b363SPhilipp Reisner } 2378b411b363SPhilipp Reisner 2379b411b363SPhilipp Reisner /* 2380b411b363SPhilipp Reisner 100 after split brain try auto recover 2381b411b363SPhilipp Reisner 2 C_SYNC_SOURCE set BitMap 2382b411b363SPhilipp Reisner 1 C_SYNC_SOURCE use BitMap 2383b411b363SPhilipp Reisner 0 no Sync 2384b411b363SPhilipp Reisner -1 C_SYNC_TARGET use BitMap 2385b411b363SPhilipp Reisner -2 C_SYNC_TARGET set BitMap 2386b411b363SPhilipp Reisner -100 after split brain, disconnect 2387b411b363SPhilipp Reisner -1000 unrelated data 23884a23f264SPhilipp Reisner -1091 requires proto 91 23894a23f264SPhilipp Reisner -1096 requires proto 96 2390b411b363SPhilipp Reisner */ 2391b411b363SPhilipp Reisner static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local) 2392b411b363SPhilipp Reisner { 2393b411b363SPhilipp Reisner u64 self, peer; 2394b411b363SPhilipp Reisner int i, j; 2395b411b363SPhilipp Reisner 2396b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2397b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2398b411b363SPhilipp Reisner 2399b411b363SPhilipp Reisner *rule_nr = 10; 2400b411b363SPhilipp Reisner if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) 2401b411b363SPhilipp Reisner return 0; 2402b411b363SPhilipp Reisner 2403b411b363SPhilipp Reisner *rule_nr = 20; 2404b411b363SPhilipp Reisner if ((self == UUID_JUST_CREATED || self == (u64)0) && 2405b411b363SPhilipp Reisner peer != UUID_JUST_CREATED) 2406b411b363SPhilipp Reisner return -2; 2407b411b363SPhilipp Reisner 2408b411b363SPhilipp Reisner *rule_nr = 30; 2409b411b363SPhilipp Reisner if (self != UUID_JUST_CREATED && 2410b411b363SPhilipp Reisner (peer == UUID_JUST_CREATED || peer == (u64)0)) 2411b411b363SPhilipp Reisner return 2; 2412b411b363SPhilipp Reisner 2413b411b363SPhilipp Reisner if (self == peer) { 2414b411b363SPhilipp Reisner int rct, dc; /* roles at crash time */ 2415b411b363SPhilipp Reisner 2416b411b363SPhilipp Reisner if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) { 2417b411b363SPhilipp Reisner 241831890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 24194a23f264SPhilipp Reisner return -1091; 2420b411b363SPhilipp Reisner 2421b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) && 2422b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { 2423b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n"); 2424b411b363SPhilipp Reisner drbd_uuid_set_bm(mdev, 0UL); 2425b411b363SPhilipp Reisner 2426b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2427b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2428b411b363SPhilipp Reisner *rule_nr = 34; 2429b411b363SPhilipp Reisner } else { 2430b411b363SPhilipp Reisner dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n"); 2431b411b363SPhilipp Reisner *rule_nr = 36; 2432b411b363SPhilipp Reisner } 2433b411b363SPhilipp Reisner 2434b411b363SPhilipp Reisner return 1; 2435b411b363SPhilipp Reisner } 2436b411b363SPhilipp Reisner 2437b411b363SPhilipp Reisner if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) { 2438b411b363SPhilipp Reisner 243931890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 24404a23f264SPhilipp Reisner return -1091; 2441b411b363SPhilipp Reisner 2442b411b363SPhilipp Reisner if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) && 2443b411b363SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) { 2444b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); 2445b411b363SPhilipp Reisner 2446b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START]; 2447b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP]; 2448b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = 0UL; 2449b411b363SPhilipp Reisner 2450b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2451b411b363SPhilipp Reisner *rule_nr = 35; 2452b411b363SPhilipp Reisner } else { 2453b411b363SPhilipp Reisner dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n"); 2454b411b363SPhilipp Reisner *rule_nr = 37; 2455b411b363SPhilipp Reisner } 2456b411b363SPhilipp Reisner 2457b411b363SPhilipp Reisner return -1; 2458b411b363SPhilipp Reisner } 2459b411b363SPhilipp Reisner 2460b411b363SPhilipp Reisner /* Common power [off|failure] */ 2461b411b363SPhilipp Reisner rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) + 2462b411b363SPhilipp Reisner (mdev->p_uuid[UI_FLAGS] & 2); 2463b411b363SPhilipp Reisner /* lowest bit is set when we were primary, 2464b411b363SPhilipp Reisner * next bit (weight 2) is set when peer was primary */ 2465b411b363SPhilipp Reisner *rule_nr = 40; 2466b411b363SPhilipp Reisner 2467b411b363SPhilipp Reisner switch (rct) { 2468b411b363SPhilipp Reisner case 0: /* !self_pri && !peer_pri */ return 0; 2469b411b363SPhilipp Reisner case 1: /* self_pri && !peer_pri */ return 1; 2470b411b363SPhilipp Reisner case 2: /* !self_pri && peer_pri */ return -1; 2471b411b363SPhilipp Reisner case 3: /* self_pri && peer_pri */ 2472b411b363SPhilipp Reisner dc = test_bit(DISCARD_CONCURRENT, &mdev->flags); 2473b411b363SPhilipp Reisner return dc ? -1 : 1; 2474b411b363SPhilipp Reisner } 2475b411b363SPhilipp Reisner } 2476b411b363SPhilipp Reisner 2477b411b363SPhilipp Reisner *rule_nr = 50; 2478b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2479b411b363SPhilipp Reisner if (self == peer) 2480b411b363SPhilipp Reisner return -1; 2481b411b363SPhilipp Reisner 2482b411b363SPhilipp Reisner *rule_nr = 51; 2483b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); 2484b411b363SPhilipp Reisner if (self == peer) { 248531890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 96 ? 24864a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == 24874a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) : 24884a23f264SPhilipp Reisner peer + UUID_NEW_BM_OFFSET == (mdev->p_uuid[UI_BITMAP] & ~((u64)1))) { 2489b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2490b411b363SPhilipp Reisner resync as sync source modifications of the peer's UUIDs. */ 2491b411b363SPhilipp Reisner 249231890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 24934a23f264SPhilipp Reisner return -1091; 2494b411b363SPhilipp Reisner 2495b411b363SPhilipp Reisner mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START]; 2496b411b363SPhilipp Reisner mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1]; 24974a23f264SPhilipp Reisner 24984a23f264SPhilipp Reisner dev_info(DEV, "Did not got last syncUUID packet, corrected:\n"); 24994a23f264SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 25004a23f264SPhilipp Reisner 2501b411b363SPhilipp Reisner return -1; 2502b411b363SPhilipp Reisner } 2503b411b363SPhilipp Reisner } 2504b411b363SPhilipp Reisner 2505b411b363SPhilipp Reisner *rule_nr = 60; 2506b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); 2507b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2508b411b363SPhilipp Reisner peer = mdev->p_uuid[i] & ~((u64)1); 2509b411b363SPhilipp Reisner if (self == peer) 2510b411b363SPhilipp Reisner return -2; 2511b411b363SPhilipp Reisner } 2512b411b363SPhilipp Reisner 2513b411b363SPhilipp Reisner *rule_nr = 70; 2514b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2515b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2516b411b363SPhilipp Reisner if (self == peer) 2517b411b363SPhilipp Reisner return 1; 2518b411b363SPhilipp Reisner 2519b411b363SPhilipp Reisner *rule_nr = 71; 2520b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); 2521b411b363SPhilipp Reisner if (self == peer) { 252231890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 96 ? 25234a23f264SPhilipp Reisner (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == 25244a23f264SPhilipp Reisner (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) : 25254a23f264SPhilipp Reisner self + UUID_NEW_BM_OFFSET == (mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) { 2526b411b363SPhilipp Reisner /* The last P_SYNC_UUID did not get though. Undo the last start of 2527b411b363SPhilipp Reisner resync as sync source modifications of our UUIDs. */ 2528b411b363SPhilipp Reisner 252931890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version < 91) 25304a23f264SPhilipp Reisner return -1091; 2531b411b363SPhilipp Reisner 2532b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]); 2533b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]); 2534b411b363SPhilipp Reisner 25354a23f264SPhilipp Reisner dev_info(DEV, "Last syncUUID did not get through, corrected:\n"); 2536b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, 2537b411b363SPhilipp Reisner mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); 2538b411b363SPhilipp Reisner 2539b411b363SPhilipp Reisner return 1; 2540b411b363SPhilipp Reisner } 2541b411b363SPhilipp Reisner } 2542b411b363SPhilipp Reisner 2543b411b363SPhilipp Reisner 2544b411b363SPhilipp Reisner *rule_nr = 80; 2545d8c2a36bSPhilipp Reisner peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); 2546b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2547b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2548b411b363SPhilipp Reisner if (self == peer) 2549b411b363SPhilipp Reisner return 2; 2550b411b363SPhilipp Reisner } 2551b411b363SPhilipp Reisner 2552b411b363SPhilipp Reisner *rule_nr = 90; 2553b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); 2554b411b363SPhilipp Reisner peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); 2555b411b363SPhilipp Reisner if (self == peer && self != ((u64)0)) 2556b411b363SPhilipp Reisner return 100; 2557b411b363SPhilipp Reisner 2558b411b363SPhilipp Reisner *rule_nr = 100; 2559b411b363SPhilipp Reisner for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { 2560b411b363SPhilipp Reisner self = mdev->ldev->md.uuid[i] & ~((u64)1); 2561b411b363SPhilipp Reisner for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { 2562b411b363SPhilipp Reisner peer = mdev->p_uuid[j] & ~((u64)1); 2563b411b363SPhilipp Reisner if (self == peer) 2564b411b363SPhilipp Reisner return -100; 2565b411b363SPhilipp Reisner } 2566b411b363SPhilipp Reisner } 2567b411b363SPhilipp Reisner 2568b411b363SPhilipp Reisner return -1000; 2569b411b363SPhilipp Reisner } 2570b411b363SPhilipp Reisner 2571b411b363SPhilipp Reisner /* drbd_sync_handshake() returns the new conn state on success, or 2572b411b363SPhilipp Reisner CONN_MASK (-1) on failure. 2573b411b363SPhilipp Reisner */ 2574b411b363SPhilipp Reisner static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role, 2575b411b363SPhilipp Reisner enum drbd_disk_state peer_disk) __must_hold(local) 2576b411b363SPhilipp Reisner { 2577b411b363SPhilipp Reisner int hg, rule_nr; 2578b411b363SPhilipp Reisner enum drbd_conns rv = C_MASK; 2579b411b363SPhilipp Reisner enum drbd_disk_state mydisk; 2580b411b363SPhilipp Reisner 2581b411b363SPhilipp Reisner mydisk = mdev->state.disk; 2582b411b363SPhilipp Reisner if (mydisk == D_NEGOTIATING) 2583b411b363SPhilipp Reisner mydisk = mdev->new_state_tmp.disk; 2584b411b363SPhilipp Reisner 2585b411b363SPhilipp Reisner dev_info(DEV, "drbd_sync_handshake:\n"); 2586b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0); 2587b411b363SPhilipp Reisner drbd_uuid_dump(mdev, "peer", mdev->p_uuid, 2588b411b363SPhilipp Reisner mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); 2589b411b363SPhilipp Reisner 2590b411b363SPhilipp Reisner hg = drbd_uuid_compare(mdev, &rule_nr); 2591b411b363SPhilipp Reisner 2592b411b363SPhilipp Reisner dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr); 2593b411b363SPhilipp Reisner 2594b411b363SPhilipp Reisner if (hg == -1000) { 2595b411b363SPhilipp Reisner dev_alert(DEV, "Unrelated data, aborting!\n"); 2596b411b363SPhilipp Reisner return C_MASK; 2597b411b363SPhilipp Reisner } 25984a23f264SPhilipp Reisner if (hg < -1000) { 25994a23f264SPhilipp Reisner dev_alert(DEV, "To resolve this both sides have to support at least protocol %d\n", -hg - 1000); 2600b411b363SPhilipp Reisner return C_MASK; 2601b411b363SPhilipp Reisner } 2602b411b363SPhilipp Reisner 2603b411b363SPhilipp Reisner if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || 2604b411b363SPhilipp Reisner (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { 2605b411b363SPhilipp Reisner int f = (hg == -100) || abs(hg) == 2; 2606b411b363SPhilipp Reisner hg = mydisk > D_INCONSISTENT ? 1 : -1; 2607b411b363SPhilipp Reisner if (f) 2608b411b363SPhilipp Reisner hg = hg*2; 2609b411b363SPhilipp Reisner dev_info(DEV, "Becoming sync %s due to disk states.\n", 2610b411b363SPhilipp Reisner hg > 0 ? "source" : "target"); 2611b411b363SPhilipp Reisner } 2612b411b363SPhilipp Reisner 26133a11a487SAdam Gandelman if (abs(hg) == 100) 26143a11a487SAdam Gandelman drbd_khelper(mdev, "initial-split-brain"); 26153a11a487SAdam Gandelman 261689e58e75SPhilipp Reisner if (hg == 100 || (hg == -100 && mdev->tconn->net_conf->always_asbp)) { 2617b411b363SPhilipp Reisner int pcount = (mdev->state.role == R_PRIMARY) 2618b411b363SPhilipp Reisner + (peer_role == R_PRIMARY); 2619b411b363SPhilipp Reisner int forced = (hg == -100); 2620b411b363SPhilipp Reisner 2621b411b363SPhilipp Reisner switch (pcount) { 2622b411b363SPhilipp Reisner case 0: 2623b411b363SPhilipp Reisner hg = drbd_asb_recover_0p(mdev); 2624b411b363SPhilipp Reisner break; 2625b411b363SPhilipp Reisner case 1: 2626b411b363SPhilipp Reisner hg = drbd_asb_recover_1p(mdev); 2627b411b363SPhilipp Reisner break; 2628b411b363SPhilipp Reisner case 2: 2629b411b363SPhilipp Reisner hg = drbd_asb_recover_2p(mdev); 2630b411b363SPhilipp Reisner break; 2631b411b363SPhilipp Reisner } 2632b411b363SPhilipp Reisner if (abs(hg) < 100) { 2633b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, %d primaries, " 2634b411b363SPhilipp Reisner "automatically solved. Sync from %s node\n", 2635b411b363SPhilipp Reisner pcount, (hg < 0) ? "peer" : "this"); 2636b411b363SPhilipp Reisner if (forced) { 2637b411b363SPhilipp Reisner dev_warn(DEV, "Doing a full sync, since" 2638b411b363SPhilipp Reisner " UUIDs where ambiguous.\n"); 2639b411b363SPhilipp Reisner hg = hg*2; 2640b411b363SPhilipp Reisner } 2641b411b363SPhilipp Reisner } 2642b411b363SPhilipp Reisner } 2643b411b363SPhilipp Reisner 2644b411b363SPhilipp Reisner if (hg == -100) { 264589e58e75SPhilipp Reisner if (mdev->tconn->net_conf->want_lose && !(mdev->p_uuid[UI_FLAGS]&1)) 2646b411b363SPhilipp Reisner hg = -1; 264789e58e75SPhilipp Reisner if (!mdev->tconn->net_conf->want_lose && (mdev->p_uuid[UI_FLAGS]&1)) 2648b411b363SPhilipp Reisner hg = 1; 2649b411b363SPhilipp Reisner 2650b411b363SPhilipp Reisner if (abs(hg) < 100) 2651b411b363SPhilipp Reisner dev_warn(DEV, "Split-Brain detected, manually solved. " 2652b411b363SPhilipp Reisner "Sync from %s node\n", 2653b411b363SPhilipp Reisner (hg < 0) ? "peer" : "this"); 2654b411b363SPhilipp Reisner } 2655b411b363SPhilipp Reisner 2656b411b363SPhilipp Reisner if (hg == -100) { 2657580b9767SLars Ellenberg /* FIXME this log message is not correct if we end up here 2658580b9767SLars Ellenberg * after an attempted attach on a diskless node. 2659580b9767SLars Ellenberg * We just refuse to attach -- well, we drop the "connection" 2660580b9767SLars Ellenberg * to that disk, in a way... */ 26613a11a487SAdam Gandelman dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n"); 2662b411b363SPhilipp Reisner drbd_khelper(mdev, "split-brain"); 2663b411b363SPhilipp Reisner return C_MASK; 2664b411b363SPhilipp Reisner } 2665b411b363SPhilipp Reisner 2666b411b363SPhilipp Reisner if (hg > 0 && mydisk <= D_INCONSISTENT) { 2667b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n"); 2668b411b363SPhilipp Reisner return C_MASK; 2669b411b363SPhilipp Reisner } 2670b411b363SPhilipp Reisner 2671b411b363SPhilipp Reisner if (hg < 0 && /* by intention we do not use mydisk here. */ 2672b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) { 267389e58e75SPhilipp Reisner switch (mdev->tconn->net_conf->rr_conflict) { 2674b411b363SPhilipp Reisner case ASB_CALL_HELPER: 2675b411b363SPhilipp Reisner drbd_khelper(mdev, "pri-lost"); 2676b411b363SPhilipp Reisner /* fall through */ 2677b411b363SPhilipp Reisner case ASB_DISCONNECT: 2678b411b363SPhilipp Reisner dev_err(DEV, "I shall become SyncTarget, but I am primary!\n"); 2679b411b363SPhilipp Reisner return C_MASK; 2680b411b363SPhilipp Reisner case ASB_VIOLENTLY: 2681b411b363SPhilipp Reisner dev_warn(DEV, "Becoming SyncTarget, violating the stable-data" 2682b411b363SPhilipp Reisner "assumption\n"); 2683b411b363SPhilipp Reisner } 2684b411b363SPhilipp Reisner } 2685b411b363SPhilipp Reisner 268689e58e75SPhilipp Reisner if (mdev->tconn->net_conf->dry_run || test_bit(CONN_DRY_RUN, &mdev->flags)) { 2687cf14c2e9SPhilipp Reisner if (hg == 0) 2688cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n"); 2689cf14c2e9SPhilipp Reisner else 2690cf14c2e9SPhilipp Reisner dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.", 2691cf14c2e9SPhilipp Reisner drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), 2692cf14c2e9SPhilipp Reisner abs(hg) >= 2 ? "full" : "bit-map based"); 2693cf14c2e9SPhilipp Reisner return C_MASK; 2694cf14c2e9SPhilipp Reisner } 2695cf14c2e9SPhilipp Reisner 2696b411b363SPhilipp Reisner if (abs(hg) >= 2) { 2697b411b363SPhilipp Reisner dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); 269820ceb2b2SLars Ellenberg if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake", 269920ceb2b2SLars Ellenberg BM_LOCKED_SET_ALLOWED)) 2700b411b363SPhilipp Reisner return C_MASK; 2701b411b363SPhilipp Reisner } 2702b411b363SPhilipp Reisner 2703b411b363SPhilipp Reisner if (hg > 0) { /* become sync source. */ 2704b411b363SPhilipp Reisner rv = C_WF_BITMAP_S; 2705b411b363SPhilipp Reisner } else if (hg < 0) { /* become sync target */ 2706b411b363SPhilipp Reisner rv = C_WF_BITMAP_T; 2707b411b363SPhilipp Reisner } else { 2708b411b363SPhilipp Reisner rv = C_CONNECTED; 2709b411b363SPhilipp Reisner if (drbd_bm_total_weight(mdev)) { 2710b411b363SPhilipp Reisner dev_info(DEV, "No resync, but %lu bits in bitmap!\n", 2711b411b363SPhilipp Reisner drbd_bm_total_weight(mdev)); 2712b411b363SPhilipp Reisner } 2713b411b363SPhilipp Reisner } 2714b411b363SPhilipp Reisner 2715b411b363SPhilipp Reisner return rv; 2716b411b363SPhilipp Reisner } 2717b411b363SPhilipp Reisner 2718b411b363SPhilipp Reisner /* returns 1 if invalid */ 2719b411b363SPhilipp Reisner static int cmp_after_sb(enum drbd_after_sb_p peer, enum drbd_after_sb_p self) 2720b411b363SPhilipp Reisner { 2721b411b363SPhilipp Reisner /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ 2722b411b363SPhilipp Reisner if ((peer == ASB_DISCARD_REMOTE && self == ASB_DISCARD_LOCAL) || 2723b411b363SPhilipp Reisner (self == ASB_DISCARD_REMOTE && peer == ASB_DISCARD_LOCAL)) 2724b411b363SPhilipp Reisner return 0; 2725b411b363SPhilipp Reisner 2726b411b363SPhilipp Reisner /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ 2727b411b363SPhilipp Reisner if (peer == ASB_DISCARD_REMOTE || peer == ASB_DISCARD_LOCAL || 2728b411b363SPhilipp Reisner self == ASB_DISCARD_REMOTE || self == ASB_DISCARD_LOCAL) 2729b411b363SPhilipp Reisner return 1; 2730b411b363SPhilipp Reisner 2731b411b363SPhilipp Reisner /* everything else is valid if they are equal on both sides. */ 2732b411b363SPhilipp Reisner if (peer == self) 2733b411b363SPhilipp Reisner return 0; 2734b411b363SPhilipp Reisner 2735b411b363SPhilipp Reisner /* everything es is invalid. */ 2736b411b363SPhilipp Reisner return 1; 2737b411b363SPhilipp Reisner } 2738b411b363SPhilipp Reisner 2739d8763023SAndreas Gruenbacher static int receive_protocol(struct drbd_conf *mdev, enum drbd_packet cmd, 2740d8763023SAndreas Gruenbacher unsigned int data_size) 2741b411b363SPhilipp Reisner { 2742e42325a5SPhilipp Reisner struct p_protocol *p = &mdev->tconn->data.rbuf.protocol; 2743b411b363SPhilipp Reisner int p_proto, p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; 2744cf14c2e9SPhilipp Reisner int p_want_lose, p_two_primaries, cf; 2745b411b363SPhilipp Reisner char p_integrity_alg[SHARED_SECRET_MAX] = ""; 2746b411b363SPhilipp Reisner 2747b411b363SPhilipp Reisner p_proto = be32_to_cpu(p->protocol); 2748b411b363SPhilipp Reisner p_after_sb_0p = be32_to_cpu(p->after_sb_0p); 2749b411b363SPhilipp Reisner p_after_sb_1p = be32_to_cpu(p->after_sb_1p); 2750b411b363SPhilipp Reisner p_after_sb_2p = be32_to_cpu(p->after_sb_2p); 2751b411b363SPhilipp Reisner p_two_primaries = be32_to_cpu(p->two_primaries); 2752cf14c2e9SPhilipp Reisner cf = be32_to_cpu(p->conn_flags); 2753cf14c2e9SPhilipp Reisner p_want_lose = cf & CF_WANT_LOSE; 2754cf14c2e9SPhilipp Reisner 2755cf14c2e9SPhilipp Reisner clear_bit(CONN_DRY_RUN, &mdev->flags); 2756cf14c2e9SPhilipp Reisner 2757cf14c2e9SPhilipp Reisner if (cf & CF_DRY_RUN) 2758cf14c2e9SPhilipp Reisner set_bit(CONN_DRY_RUN, &mdev->flags); 2759b411b363SPhilipp Reisner 276089e58e75SPhilipp Reisner if (p_proto != mdev->tconn->net_conf->wire_protocol) { 2761b411b363SPhilipp Reisner dev_err(DEV, "incompatible communication protocols\n"); 2762b411b363SPhilipp Reisner goto disconnect; 2763b411b363SPhilipp Reisner } 2764b411b363SPhilipp Reisner 276589e58e75SPhilipp Reisner if (cmp_after_sb(p_after_sb_0p, mdev->tconn->net_conf->after_sb_0p)) { 2766b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-0pri settings\n"); 2767b411b363SPhilipp Reisner goto disconnect; 2768b411b363SPhilipp Reisner } 2769b411b363SPhilipp Reisner 277089e58e75SPhilipp Reisner if (cmp_after_sb(p_after_sb_1p, mdev->tconn->net_conf->after_sb_1p)) { 2771b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-1pri settings\n"); 2772b411b363SPhilipp Reisner goto disconnect; 2773b411b363SPhilipp Reisner } 2774b411b363SPhilipp Reisner 277589e58e75SPhilipp Reisner if (cmp_after_sb(p_after_sb_2p, mdev->tconn->net_conf->after_sb_2p)) { 2776b411b363SPhilipp Reisner dev_err(DEV, "incompatible after-sb-2pri settings\n"); 2777b411b363SPhilipp Reisner goto disconnect; 2778b411b363SPhilipp Reisner } 2779b411b363SPhilipp Reisner 278089e58e75SPhilipp Reisner if (p_want_lose && mdev->tconn->net_conf->want_lose) { 2781b411b363SPhilipp Reisner dev_err(DEV, "both sides have the 'want_lose' flag set\n"); 2782b411b363SPhilipp Reisner goto disconnect; 2783b411b363SPhilipp Reisner } 2784b411b363SPhilipp Reisner 278589e58e75SPhilipp Reisner if (p_two_primaries != mdev->tconn->net_conf->two_primaries) { 2786b411b363SPhilipp Reisner dev_err(DEV, "incompatible setting of the two-primaries options\n"); 2787b411b363SPhilipp Reisner goto disconnect; 2788b411b363SPhilipp Reisner } 2789b411b363SPhilipp Reisner 279031890f4aSPhilipp Reisner if (mdev->tconn->agreed_pro_version >= 87) { 279189e58e75SPhilipp Reisner unsigned char *my_alg = mdev->tconn->net_conf->integrity_alg; 2792b411b363SPhilipp Reisner 2793b411b363SPhilipp Reisner if (drbd_recv(mdev, p_integrity_alg, data_size) != data_size) 279481e84650SAndreas Gruenbacher return false; 2795b411b363SPhilipp Reisner 2796b411b363SPhilipp Reisner p_integrity_alg[SHARED_SECRET_MAX-1] = 0; 2797b411b363SPhilipp Reisner if (strcmp(p_integrity_alg, my_alg)) { 2798b411b363SPhilipp Reisner dev_err(DEV, "incompatible setting of the data-integrity-alg\n"); 2799b411b363SPhilipp Reisner goto disconnect; 2800b411b363SPhilipp Reisner } 2801b411b363SPhilipp Reisner dev_info(DEV, "data-integrity-alg: %s\n", 2802b411b363SPhilipp Reisner my_alg[0] ? my_alg : (unsigned char *)"<not-used>"); 2803b411b363SPhilipp Reisner } 2804b411b363SPhilipp Reisner 280581e84650SAndreas Gruenbacher return true; 2806b411b363SPhilipp Reisner 2807b411b363SPhilipp Reisner disconnect: 2808b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 280981e84650SAndreas Gruenbacher return false; 2810b411b363SPhilipp Reisner } 2811b411b363SPhilipp Reisner 2812b411b363SPhilipp Reisner /* helper function 2813b411b363SPhilipp Reisner * input: alg name, feature name 2814b411b363SPhilipp Reisner * return: NULL (alg name was "") 2815b411b363SPhilipp Reisner * ERR_PTR(error) if something goes wrong 2816b411b363SPhilipp Reisner * or the crypto hash ptr, if it worked out ok. */ 2817b411b363SPhilipp Reisner struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev, 2818b411b363SPhilipp Reisner const char *alg, const char *name) 2819b411b363SPhilipp Reisner { 2820b411b363SPhilipp Reisner struct crypto_hash *tfm; 2821b411b363SPhilipp Reisner 2822b411b363SPhilipp Reisner if (!alg[0]) 2823b411b363SPhilipp Reisner return NULL; 2824b411b363SPhilipp Reisner 2825b411b363SPhilipp Reisner tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC); 2826b411b363SPhilipp Reisner if (IS_ERR(tfm)) { 2827b411b363SPhilipp Reisner dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n", 2828b411b363SPhilipp Reisner alg, name, PTR_ERR(tfm)); 2829b411b363SPhilipp Reisner return tfm; 2830b411b363SPhilipp Reisner } 2831b411b363SPhilipp Reisner if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) { 2832b411b363SPhilipp Reisner crypto_free_hash(tfm); 2833b411b363SPhilipp Reisner dev_err(DEV, "\"%s\" is not a digest (%s)\n", alg, name); 2834b411b363SPhilipp Reisner return ERR_PTR(-EINVAL); 2835b411b363SPhilipp Reisner } 2836b411b363SPhilipp Reisner return tfm; 2837b411b363SPhilipp Reisner } 2838b411b363SPhilipp Reisner 2839d8763023SAndreas Gruenbacher static int receive_SyncParam(struct drbd_conf *mdev, enum drbd_packet cmd, 2840d8763023SAndreas Gruenbacher unsigned int packet_size) 2841b411b363SPhilipp Reisner { 284281e84650SAndreas Gruenbacher int ok = true; 2843e42325a5SPhilipp Reisner struct p_rs_param_95 *p = &mdev->tconn->data.rbuf.rs_param_95; 2844b411b363SPhilipp Reisner unsigned int header_size, data_size, exp_max_sz; 2845b411b363SPhilipp Reisner struct crypto_hash *verify_tfm = NULL; 2846b411b363SPhilipp Reisner struct crypto_hash *csums_tfm = NULL; 284731890f4aSPhilipp Reisner const int apv = mdev->tconn->agreed_pro_version; 2848778f271dSPhilipp Reisner int *rs_plan_s = NULL; 2849778f271dSPhilipp Reisner int fifo_size = 0; 2850b411b363SPhilipp Reisner 2851b411b363SPhilipp Reisner exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) 2852b411b363SPhilipp Reisner : apv == 88 ? sizeof(struct p_rs_param) 2853b411b363SPhilipp Reisner + SHARED_SECRET_MAX 28548e26f9ccSPhilipp Reisner : apv <= 94 ? sizeof(struct p_rs_param_89) 28558e26f9ccSPhilipp Reisner : /* apv >= 95 */ sizeof(struct p_rs_param_95); 2856b411b363SPhilipp Reisner 285702918be2SPhilipp Reisner if (packet_size > exp_max_sz) { 2858b411b363SPhilipp Reisner dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n", 285902918be2SPhilipp Reisner packet_size, exp_max_sz); 286081e84650SAndreas Gruenbacher return false; 2861b411b363SPhilipp Reisner } 2862b411b363SPhilipp Reisner 2863b411b363SPhilipp Reisner if (apv <= 88) { 2864257d0af6SPhilipp Reisner header_size = sizeof(struct p_rs_param) - sizeof(struct p_header); 286502918be2SPhilipp Reisner data_size = packet_size - header_size; 28668e26f9ccSPhilipp Reisner } else if (apv <= 94) { 2867257d0af6SPhilipp Reisner header_size = sizeof(struct p_rs_param_89) - sizeof(struct p_header); 286802918be2SPhilipp Reisner data_size = packet_size - header_size; 2869b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 28708e26f9ccSPhilipp Reisner } else { 2871257d0af6SPhilipp Reisner header_size = sizeof(struct p_rs_param_95) - sizeof(struct p_header); 287202918be2SPhilipp Reisner data_size = packet_size - header_size; 2873b411b363SPhilipp Reisner D_ASSERT(data_size == 0); 2874b411b363SPhilipp Reisner } 2875b411b363SPhilipp Reisner 2876b411b363SPhilipp Reisner /* initialize verify_alg and csums_alg */ 2877b411b363SPhilipp Reisner memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); 2878b411b363SPhilipp Reisner 287902918be2SPhilipp Reisner if (drbd_recv(mdev, &p->head.payload, header_size) != header_size) 288081e84650SAndreas Gruenbacher return false; 2881b411b363SPhilipp Reisner 2882b411b363SPhilipp Reisner mdev->sync_conf.rate = be32_to_cpu(p->rate); 2883b411b363SPhilipp Reisner 2884b411b363SPhilipp Reisner if (apv >= 88) { 2885b411b363SPhilipp Reisner if (apv == 88) { 2886b411b363SPhilipp Reisner if (data_size > SHARED_SECRET_MAX) { 2887b411b363SPhilipp Reisner dev_err(DEV, "verify-alg too long, " 2888b411b363SPhilipp Reisner "peer wants %u, accepting only %u byte\n", 2889b411b363SPhilipp Reisner data_size, SHARED_SECRET_MAX); 289081e84650SAndreas Gruenbacher return false; 2891b411b363SPhilipp Reisner } 2892b411b363SPhilipp Reisner 2893b411b363SPhilipp Reisner if (drbd_recv(mdev, p->verify_alg, data_size) != data_size) 289481e84650SAndreas Gruenbacher return false; 2895b411b363SPhilipp Reisner 2896b411b363SPhilipp Reisner /* we expect NUL terminated string */ 2897b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 2898b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[data_size-1] == 0); 2899b411b363SPhilipp Reisner p->verify_alg[data_size-1] = 0; 2900b411b363SPhilipp Reisner 2901b411b363SPhilipp Reisner } else /* apv >= 89 */ { 2902b411b363SPhilipp Reisner /* we still expect NUL terminated strings */ 2903b411b363SPhilipp Reisner /* but just in case someone tries to be evil */ 2904b411b363SPhilipp Reisner D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0); 2905b411b363SPhilipp Reisner D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0); 2906b411b363SPhilipp Reisner p->verify_alg[SHARED_SECRET_MAX-1] = 0; 2907b411b363SPhilipp Reisner p->csums_alg[SHARED_SECRET_MAX-1] = 0; 2908b411b363SPhilipp Reisner } 2909b411b363SPhilipp Reisner 2910b411b363SPhilipp Reisner if (strcmp(mdev->sync_conf.verify_alg, p->verify_alg)) { 2911b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 2912b411b363SPhilipp Reisner dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", 2913b411b363SPhilipp Reisner mdev->sync_conf.verify_alg, p->verify_alg); 2914b411b363SPhilipp Reisner goto disconnect; 2915b411b363SPhilipp Reisner } 2916b411b363SPhilipp Reisner verify_tfm = drbd_crypto_alloc_digest_safe(mdev, 2917b411b363SPhilipp Reisner p->verify_alg, "verify-alg"); 2918b411b363SPhilipp Reisner if (IS_ERR(verify_tfm)) { 2919b411b363SPhilipp Reisner verify_tfm = NULL; 2920b411b363SPhilipp Reisner goto disconnect; 2921b411b363SPhilipp Reisner } 2922b411b363SPhilipp Reisner } 2923b411b363SPhilipp Reisner 2924b411b363SPhilipp Reisner if (apv >= 89 && strcmp(mdev->sync_conf.csums_alg, p->csums_alg)) { 2925b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) { 2926b411b363SPhilipp Reisner dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", 2927b411b363SPhilipp Reisner mdev->sync_conf.csums_alg, p->csums_alg); 2928b411b363SPhilipp Reisner goto disconnect; 2929b411b363SPhilipp Reisner } 2930b411b363SPhilipp Reisner csums_tfm = drbd_crypto_alloc_digest_safe(mdev, 2931b411b363SPhilipp Reisner p->csums_alg, "csums-alg"); 2932b411b363SPhilipp Reisner if (IS_ERR(csums_tfm)) { 2933b411b363SPhilipp Reisner csums_tfm = NULL; 2934b411b363SPhilipp Reisner goto disconnect; 2935b411b363SPhilipp Reisner } 2936b411b363SPhilipp Reisner } 2937b411b363SPhilipp Reisner 29388e26f9ccSPhilipp Reisner if (apv > 94) { 29398e26f9ccSPhilipp Reisner mdev->sync_conf.rate = be32_to_cpu(p->rate); 29408e26f9ccSPhilipp Reisner mdev->sync_conf.c_plan_ahead = be32_to_cpu(p->c_plan_ahead); 29418e26f9ccSPhilipp Reisner mdev->sync_conf.c_delay_target = be32_to_cpu(p->c_delay_target); 29428e26f9ccSPhilipp Reisner mdev->sync_conf.c_fill_target = be32_to_cpu(p->c_fill_target); 29438e26f9ccSPhilipp Reisner mdev->sync_conf.c_max_rate = be32_to_cpu(p->c_max_rate); 2944778f271dSPhilipp Reisner 2945778f271dSPhilipp Reisner fifo_size = (mdev->sync_conf.c_plan_ahead * 10 * SLEEP_TIME) / HZ; 2946778f271dSPhilipp Reisner if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) { 2947778f271dSPhilipp Reisner rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL); 2948778f271dSPhilipp Reisner if (!rs_plan_s) { 2949778f271dSPhilipp Reisner dev_err(DEV, "kmalloc of fifo_buffer failed"); 2950778f271dSPhilipp Reisner goto disconnect; 2951778f271dSPhilipp Reisner } 2952778f271dSPhilipp Reisner } 29538e26f9ccSPhilipp Reisner } 2954b411b363SPhilipp Reisner 2955b411b363SPhilipp Reisner spin_lock(&mdev->peer_seq_lock); 2956b411b363SPhilipp Reisner /* lock against drbd_nl_syncer_conf() */ 2957b411b363SPhilipp Reisner if (verify_tfm) { 2958b411b363SPhilipp Reisner strcpy(mdev->sync_conf.verify_alg, p->verify_alg); 2959b411b363SPhilipp Reisner mdev->sync_conf.verify_alg_len = strlen(p->verify_alg) + 1; 2960b411b363SPhilipp Reisner crypto_free_hash(mdev->verify_tfm); 2961b411b363SPhilipp Reisner mdev->verify_tfm = verify_tfm; 2962b411b363SPhilipp Reisner dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg); 2963b411b363SPhilipp Reisner } 2964b411b363SPhilipp Reisner if (csums_tfm) { 2965b411b363SPhilipp Reisner strcpy(mdev->sync_conf.csums_alg, p->csums_alg); 2966b411b363SPhilipp Reisner mdev->sync_conf.csums_alg_len = strlen(p->csums_alg) + 1; 2967b411b363SPhilipp Reisner crypto_free_hash(mdev->csums_tfm); 2968b411b363SPhilipp Reisner mdev->csums_tfm = csums_tfm; 2969b411b363SPhilipp Reisner dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg); 2970b411b363SPhilipp Reisner } 2971778f271dSPhilipp Reisner if (fifo_size != mdev->rs_plan_s.size) { 2972778f271dSPhilipp Reisner kfree(mdev->rs_plan_s.values); 2973778f271dSPhilipp Reisner mdev->rs_plan_s.values = rs_plan_s; 2974778f271dSPhilipp Reisner mdev->rs_plan_s.size = fifo_size; 2975778f271dSPhilipp Reisner mdev->rs_planed = 0; 2976778f271dSPhilipp Reisner } 2977b411b363SPhilipp Reisner spin_unlock(&mdev->peer_seq_lock); 2978b411b363SPhilipp Reisner } 2979b411b363SPhilipp Reisner 2980b411b363SPhilipp Reisner return ok; 2981b411b363SPhilipp Reisner disconnect: 2982b411b363SPhilipp Reisner /* just for completeness: actually not needed, 2983b411b363SPhilipp Reisner * as this is not reached if csums_tfm was ok. */ 2984b411b363SPhilipp Reisner crypto_free_hash(csums_tfm); 2985b411b363SPhilipp Reisner /* but free the verify_tfm again, if csums_tfm did not work out */ 2986b411b363SPhilipp Reisner crypto_free_hash(verify_tfm); 2987b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 298881e84650SAndreas Gruenbacher return false; 2989b411b363SPhilipp Reisner } 2990b411b363SPhilipp Reisner 2991b411b363SPhilipp Reisner /* warn if the arguments differ by more than 12.5% */ 2992b411b363SPhilipp Reisner static void warn_if_differ_considerably(struct drbd_conf *mdev, 2993b411b363SPhilipp Reisner const char *s, sector_t a, sector_t b) 2994b411b363SPhilipp Reisner { 2995b411b363SPhilipp Reisner sector_t d; 2996b411b363SPhilipp Reisner if (a == 0 || b == 0) 2997b411b363SPhilipp Reisner return; 2998b411b363SPhilipp Reisner d = (a > b) ? (a - b) : (b - a); 2999b411b363SPhilipp Reisner if (d > (a>>3) || d > (b>>3)) 3000b411b363SPhilipp Reisner dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s, 3001b411b363SPhilipp Reisner (unsigned long long)a, (unsigned long long)b); 3002b411b363SPhilipp Reisner } 3003b411b363SPhilipp Reisner 3004d8763023SAndreas Gruenbacher static int receive_sizes(struct drbd_conf *mdev, enum drbd_packet cmd, 3005d8763023SAndreas Gruenbacher unsigned int data_size) 3006b411b363SPhilipp Reisner { 3007e42325a5SPhilipp Reisner struct p_sizes *p = &mdev->tconn->data.rbuf.sizes; 3008b411b363SPhilipp Reisner enum determine_dev_size dd = unchanged; 3009b411b363SPhilipp Reisner sector_t p_size, p_usize, my_usize; 3010b411b363SPhilipp Reisner int ldsc = 0; /* local disk size changed */ 3011e89b591cSPhilipp Reisner enum dds_flags ddsf; 3012b411b363SPhilipp Reisner 3013b411b363SPhilipp Reisner p_size = be64_to_cpu(p->d_size); 3014b411b363SPhilipp Reisner p_usize = be64_to_cpu(p->u_size); 3015b411b363SPhilipp Reisner 3016b411b363SPhilipp Reisner if (p_size == 0 && mdev->state.disk == D_DISKLESS) { 3017b411b363SPhilipp Reisner dev_err(DEV, "some backing storage is needed\n"); 3018b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 301981e84650SAndreas Gruenbacher return false; 3020b411b363SPhilipp Reisner } 3021b411b363SPhilipp Reisner 3022b411b363SPhilipp Reisner /* just store the peer's disk size for now. 3023b411b363SPhilipp Reisner * we still need to figure out whether we accept that. */ 3024b411b363SPhilipp Reisner mdev->p_size = p_size; 3025b411b363SPhilipp Reisner 3026b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3027b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "lower level device sizes", 3028b411b363SPhilipp Reisner p_size, drbd_get_max_capacity(mdev->ldev)); 3029b411b363SPhilipp Reisner warn_if_differ_considerably(mdev, "user requested size", 3030b411b363SPhilipp Reisner p_usize, mdev->ldev->dc.disk_size); 3031b411b363SPhilipp Reisner 3032b411b363SPhilipp Reisner /* if this is the first connect, or an otherwise expected 3033b411b363SPhilipp Reisner * param exchange, choose the minimum */ 3034b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_REPORT_PARAMS) 3035b411b363SPhilipp Reisner p_usize = min_not_zero((sector_t)mdev->ldev->dc.disk_size, 3036b411b363SPhilipp Reisner p_usize); 3037b411b363SPhilipp Reisner 3038b411b363SPhilipp Reisner my_usize = mdev->ldev->dc.disk_size; 3039b411b363SPhilipp Reisner 3040b411b363SPhilipp Reisner if (mdev->ldev->dc.disk_size != p_usize) { 3041b411b363SPhilipp Reisner mdev->ldev->dc.disk_size = p_usize; 3042b411b363SPhilipp Reisner dev_info(DEV, "Peer sets u_size to %lu sectors\n", 3043b411b363SPhilipp Reisner (unsigned long)mdev->ldev->dc.disk_size); 3044b411b363SPhilipp Reisner } 3045b411b363SPhilipp Reisner 3046b411b363SPhilipp Reisner /* Never shrink a device with usable data during connect. 3047b411b363SPhilipp Reisner But allow online shrinking if we are connected. */ 3048a393db6fSPhilipp Reisner if (drbd_new_dev_size(mdev, mdev->ldev, 0) < 3049b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) && 3050b411b363SPhilipp Reisner mdev->state.disk >= D_OUTDATED && 3051b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED) { 3052b411b363SPhilipp Reisner dev_err(DEV, "The peer's disk size is too small!\n"); 3053b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 3054b411b363SPhilipp Reisner mdev->ldev->dc.disk_size = my_usize; 3055b411b363SPhilipp Reisner put_ldev(mdev); 305681e84650SAndreas Gruenbacher return false; 3057b411b363SPhilipp Reisner } 3058b411b363SPhilipp Reisner put_ldev(mdev); 3059b411b363SPhilipp Reisner } 3060b411b363SPhilipp Reisner 3061e89b591cSPhilipp Reisner ddsf = be16_to_cpu(p->dds_flags); 3062b411b363SPhilipp Reisner if (get_ldev(mdev)) { 306324c4830cSBart Van Assche dd = drbd_determine_dev_size(mdev, ddsf); 3064b411b363SPhilipp Reisner put_ldev(mdev); 3065b411b363SPhilipp Reisner if (dd == dev_size_error) 306681e84650SAndreas Gruenbacher return false; 3067b411b363SPhilipp Reisner drbd_md_sync(mdev); 3068b411b363SPhilipp Reisner } else { 3069b411b363SPhilipp Reisner /* I am diskless, need to accept the peer's size. */ 3070b411b363SPhilipp Reisner drbd_set_my_capacity(mdev, p_size); 3071b411b363SPhilipp Reisner } 3072b411b363SPhilipp Reisner 307399432fccSPhilipp Reisner mdev->peer_max_bio_size = be32_to_cpu(p->max_bio_size); 307499432fccSPhilipp Reisner drbd_reconsider_max_bio_size(mdev); 307599432fccSPhilipp Reisner 3076b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3077b411b363SPhilipp Reisner if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { 3078b411b363SPhilipp Reisner mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); 3079b411b363SPhilipp Reisner ldsc = 1; 3080b411b363SPhilipp Reisner } 3081b411b363SPhilipp Reisner 3082b411b363SPhilipp Reisner put_ldev(mdev); 3083b411b363SPhilipp Reisner } 3084b411b363SPhilipp Reisner 3085b411b363SPhilipp Reisner if (mdev->state.conn > C_WF_REPORT_PARAMS) { 3086b411b363SPhilipp Reisner if (be64_to_cpu(p->c_size) != 3087b411b363SPhilipp Reisner drbd_get_capacity(mdev->this_bdev) || ldsc) { 3088b411b363SPhilipp Reisner /* we have different sizes, probably peer 3089b411b363SPhilipp Reisner * needs to know my new size... */ 3090e89b591cSPhilipp Reisner drbd_send_sizes(mdev, 0, ddsf); 3091b411b363SPhilipp Reisner } 3092b411b363SPhilipp Reisner if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) || 3093b411b363SPhilipp Reisner (dd == grew && mdev->state.conn == C_CONNECTED)) { 3094b411b363SPhilipp Reisner if (mdev->state.pdsk >= D_INCONSISTENT && 3095e89b591cSPhilipp Reisner mdev->state.disk >= D_INCONSISTENT) { 3096e89b591cSPhilipp Reisner if (ddsf & DDSF_NO_RESYNC) 3097e89b591cSPhilipp Reisner dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n"); 3098b411b363SPhilipp Reisner else 3099e89b591cSPhilipp Reisner resync_after_online_grow(mdev); 3100e89b591cSPhilipp Reisner } else 3101b411b363SPhilipp Reisner set_bit(RESYNC_AFTER_NEG, &mdev->flags); 3102b411b363SPhilipp Reisner } 3103b411b363SPhilipp Reisner } 3104b411b363SPhilipp Reisner 310581e84650SAndreas Gruenbacher return true; 3106b411b363SPhilipp Reisner } 3107b411b363SPhilipp Reisner 3108d8763023SAndreas Gruenbacher static int receive_uuids(struct drbd_conf *mdev, enum drbd_packet cmd, 3109d8763023SAndreas Gruenbacher unsigned int data_size) 3110b411b363SPhilipp Reisner { 3111e42325a5SPhilipp Reisner struct p_uuids *p = &mdev->tconn->data.rbuf.uuids; 3112b411b363SPhilipp Reisner u64 *p_uuid; 311362b0da3aSLars Ellenberg int i, updated_uuids = 0; 3114b411b363SPhilipp Reisner 3115b411b363SPhilipp Reisner p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); 3116b411b363SPhilipp Reisner 3117b411b363SPhilipp Reisner for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) 3118b411b363SPhilipp Reisner p_uuid[i] = be64_to_cpu(p->uuid[i]); 3119b411b363SPhilipp Reisner 3120b411b363SPhilipp Reisner kfree(mdev->p_uuid); 3121b411b363SPhilipp Reisner mdev->p_uuid = p_uuid; 3122b411b363SPhilipp Reisner 3123b411b363SPhilipp Reisner if (mdev->state.conn < C_CONNECTED && 3124b411b363SPhilipp Reisner mdev->state.disk < D_INCONSISTENT && 3125b411b363SPhilipp Reisner mdev->state.role == R_PRIMARY && 3126b411b363SPhilipp Reisner (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { 3127b411b363SPhilipp Reisner dev_err(DEV, "Can only connect to data with current UUID=%016llX\n", 3128b411b363SPhilipp Reisner (unsigned long long)mdev->ed_uuid); 3129b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 313081e84650SAndreas Gruenbacher return false; 3131b411b363SPhilipp Reisner } 3132b411b363SPhilipp Reisner 3133b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3134b411b363SPhilipp Reisner int skip_initial_sync = 3135b411b363SPhilipp Reisner mdev->state.conn == C_CONNECTED && 313631890f4aSPhilipp Reisner mdev->tconn->agreed_pro_version >= 90 && 3137b411b363SPhilipp Reisner mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && 3138b411b363SPhilipp Reisner (p_uuid[UI_FLAGS] & 8); 3139b411b363SPhilipp Reisner if (skip_initial_sync) { 3140b411b363SPhilipp Reisner dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n"); 3141b411b363SPhilipp Reisner drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, 314220ceb2b2SLars Ellenberg "clear_n_write from receive_uuids", 314320ceb2b2SLars Ellenberg BM_LOCKED_TEST_ALLOWED); 3144b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]); 3145b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0); 3146b411b363SPhilipp Reisner _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), 3147b411b363SPhilipp Reisner CS_VERBOSE, NULL); 3148b411b363SPhilipp Reisner drbd_md_sync(mdev); 314962b0da3aSLars Ellenberg updated_uuids = 1; 3150b411b363SPhilipp Reisner } 3151b411b363SPhilipp Reisner put_ldev(mdev); 315218a50fa2SPhilipp Reisner } else if (mdev->state.disk < D_INCONSISTENT && 315318a50fa2SPhilipp Reisner mdev->state.role == R_PRIMARY) { 315418a50fa2SPhilipp Reisner /* I am a diskless primary, the peer just created a new current UUID 315518a50fa2SPhilipp Reisner for me. */ 315662b0da3aSLars Ellenberg updated_uuids = drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 3157b411b363SPhilipp Reisner } 3158b411b363SPhilipp Reisner 3159b411b363SPhilipp Reisner /* Before we test for the disk state, we should wait until an eventually 3160b411b363SPhilipp Reisner ongoing cluster wide state change is finished. That is important if 3161b411b363SPhilipp Reisner we are primary and are detaching from our disk. We need to see the 3162b411b363SPhilipp Reisner new disk state... */ 3163b411b363SPhilipp Reisner wait_event(mdev->misc_wait, !test_bit(CLUSTER_ST_CHANGE, &mdev->flags)); 3164b411b363SPhilipp Reisner if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT) 316562b0da3aSLars Ellenberg updated_uuids |= drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); 316662b0da3aSLars Ellenberg 316762b0da3aSLars Ellenberg if (updated_uuids) 316862b0da3aSLars Ellenberg drbd_print_uuids(mdev, "receiver updated UUIDs to"); 3169b411b363SPhilipp Reisner 317081e84650SAndreas Gruenbacher return true; 3171b411b363SPhilipp Reisner } 3172b411b363SPhilipp Reisner 3173b411b363SPhilipp Reisner /** 3174b411b363SPhilipp Reisner * convert_state() - Converts the peer's view of the cluster state to our point of view 3175b411b363SPhilipp Reisner * @ps: The state as seen by the peer. 3176b411b363SPhilipp Reisner */ 3177b411b363SPhilipp Reisner static union drbd_state convert_state(union drbd_state ps) 3178b411b363SPhilipp Reisner { 3179b411b363SPhilipp Reisner union drbd_state ms; 3180b411b363SPhilipp Reisner 3181b411b363SPhilipp Reisner static enum drbd_conns c_tab[] = { 3182b411b363SPhilipp Reisner [C_CONNECTED] = C_CONNECTED, 3183b411b363SPhilipp Reisner 3184b411b363SPhilipp Reisner [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, 3185b411b363SPhilipp Reisner [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, 3186b411b363SPhilipp Reisner [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ 3187b411b363SPhilipp Reisner [C_VERIFY_S] = C_VERIFY_T, 3188b411b363SPhilipp Reisner [C_MASK] = C_MASK, 3189b411b363SPhilipp Reisner }; 3190b411b363SPhilipp Reisner 3191b411b363SPhilipp Reisner ms.i = ps.i; 3192b411b363SPhilipp Reisner 3193b411b363SPhilipp Reisner ms.conn = c_tab[ps.conn]; 3194b411b363SPhilipp Reisner ms.peer = ps.role; 3195b411b363SPhilipp Reisner ms.role = ps.peer; 3196b411b363SPhilipp Reisner ms.pdsk = ps.disk; 3197b411b363SPhilipp Reisner ms.disk = ps.pdsk; 3198b411b363SPhilipp Reisner ms.peer_isp = (ps.aftr_isp | ps.user_isp); 3199b411b363SPhilipp Reisner 3200b411b363SPhilipp Reisner return ms; 3201b411b363SPhilipp Reisner } 3202b411b363SPhilipp Reisner 3203d8763023SAndreas Gruenbacher static int receive_req_state(struct drbd_conf *mdev, enum drbd_packet cmd, 3204d8763023SAndreas Gruenbacher unsigned int data_size) 3205b411b363SPhilipp Reisner { 3206e42325a5SPhilipp Reisner struct p_req_state *p = &mdev->tconn->data.rbuf.req_state; 3207b411b363SPhilipp Reisner union drbd_state mask, val; 3208bf885f8aSAndreas Gruenbacher enum drbd_state_rv rv; 3209b411b363SPhilipp Reisner 3210b411b363SPhilipp Reisner mask.i = be32_to_cpu(p->mask); 3211b411b363SPhilipp Reisner val.i = be32_to_cpu(p->val); 3212b411b363SPhilipp Reisner 3213b411b363SPhilipp Reisner if (test_bit(DISCARD_CONCURRENT, &mdev->flags) && 3214b411b363SPhilipp Reisner test_bit(CLUSTER_ST_CHANGE, &mdev->flags)) { 3215b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG); 321681e84650SAndreas Gruenbacher return true; 3217b411b363SPhilipp Reisner } 3218b411b363SPhilipp Reisner 3219b411b363SPhilipp Reisner mask = convert_state(mask); 3220b411b363SPhilipp Reisner val = convert_state(val); 3221b411b363SPhilipp Reisner 3222b411b363SPhilipp Reisner rv = drbd_change_state(mdev, CS_VERBOSE, mask, val); 3223b411b363SPhilipp Reisner 3224b411b363SPhilipp Reisner drbd_send_sr_reply(mdev, rv); 3225b411b363SPhilipp Reisner drbd_md_sync(mdev); 3226b411b363SPhilipp Reisner 322781e84650SAndreas Gruenbacher return true; 3228b411b363SPhilipp Reisner } 3229b411b363SPhilipp Reisner 3230d8763023SAndreas Gruenbacher static int receive_state(struct drbd_conf *mdev, enum drbd_packet cmd, 3231d8763023SAndreas Gruenbacher unsigned int data_size) 3232b411b363SPhilipp Reisner { 3233e42325a5SPhilipp Reisner struct p_state *p = &mdev->tconn->data.rbuf.state; 32344ac4aadaSLars Ellenberg union drbd_state os, ns, peer_state; 3235b411b363SPhilipp Reisner enum drbd_disk_state real_peer_disk; 323665d922c3SPhilipp Reisner enum chg_state_flags cs_flags; 3237b411b363SPhilipp Reisner int rv; 3238b411b363SPhilipp Reisner 3239b411b363SPhilipp Reisner peer_state.i = be32_to_cpu(p->state); 3240b411b363SPhilipp Reisner 3241b411b363SPhilipp Reisner real_peer_disk = peer_state.disk; 3242b411b363SPhilipp Reisner if (peer_state.disk == D_NEGOTIATING) { 3243b411b363SPhilipp Reisner real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; 3244b411b363SPhilipp Reisner dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); 3245b411b363SPhilipp Reisner } 3246b411b363SPhilipp Reisner 324787eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 3248b411b363SPhilipp Reisner retry: 32494ac4aadaSLars Ellenberg os = ns = mdev->state; 325087eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3251b411b363SPhilipp Reisner 3252e9ef7bb6SLars Ellenberg /* peer says his disk is uptodate, while we think it is inconsistent, 3253e9ef7bb6SLars Ellenberg * and this happens while we think we have a sync going on. */ 3254e9ef7bb6SLars Ellenberg if (os.pdsk == D_INCONSISTENT && real_peer_disk == D_UP_TO_DATE && 3255e9ef7bb6SLars Ellenberg os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { 3256e9ef7bb6SLars Ellenberg /* If we are (becoming) SyncSource, but peer is still in sync 3257e9ef7bb6SLars Ellenberg * preparation, ignore its uptodate-ness to avoid flapping, it 3258e9ef7bb6SLars Ellenberg * will change to inconsistent once the peer reaches active 3259e9ef7bb6SLars Ellenberg * syncing states. 3260e9ef7bb6SLars Ellenberg * It may have changed syncer-paused flags, however, so we 3261e9ef7bb6SLars Ellenberg * cannot ignore this completely. */ 3262e9ef7bb6SLars Ellenberg if (peer_state.conn > C_CONNECTED && 3263e9ef7bb6SLars Ellenberg peer_state.conn < C_SYNC_SOURCE) 3264e9ef7bb6SLars Ellenberg real_peer_disk = D_INCONSISTENT; 3265e9ef7bb6SLars Ellenberg 3266e9ef7bb6SLars Ellenberg /* if peer_state changes to connected at the same time, 3267e9ef7bb6SLars Ellenberg * it explicitly notifies us that it finished resync. 3268e9ef7bb6SLars Ellenberg * Maybe we should finish it up, too? */ 3269e9ef7bb6SLars Ellenberg else if (os.conn >= C_SYNC_SOURCE && 3270e9ef7bb6SLars Ellenberg peer_state.conn == C_CONNECTED) { 3271e9ef7bb6SLars Ellenberg if (drbd_bm_total_weight(mdev) <= mdev->rs_failed) 3272e9ef7bb6SLars Ellenberg drbd_resync_finished(mdev); 327381e84650SAndreas Gruenbacher return true; 3274e9ef7bb6SLars Ellenberg } 3275e9ef7bb6SLars Ellenberg } 3276e9ef7bb6SLars Ellenberg 3277e9ef7bb6SLars Ellenberg /* peer says his disk is inconsistent, while we think it is uptodate, 3278e9ef7bb6SLars Ellenberg * and this happens while the peer still thinks we have a sync going on, 3279e9ef7bb6SLars Ellenberg * but we think we are already done with the sync. 3280e9ef7bb6SLars Ellenberg * We ignore this to avoid flapping pdsk. 3281e9ef7bb6SLars Ellenberg * This should not happen, if the peer is a recent version of drbd. */ 3282e9ef7bb6SLars Ellenberg if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && 3283e9ef7bb6SLars Ellenberg os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) 3284e9ef7bb6SLars Ellenberg real_peer_disk = D_UP_TO_DATE; 3285e9ef7bb6SLars Ellenberg 32864ac4aadaSLars Ellenberg if (ns.conn == C_WF_REPORT_PARAMS) 32874ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3288b411b363SPhilipp Reisner 328967531718SPhilipp Reisner if (peer_state.conn == C_AHEAD) 329067531718SPhilipp Reisner ns.conn = C_BEHIND; 329167531718SPhilipp Reisner 3292b411b363SPhilipp Reisner if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING && 3293b411b363SPhilipp Reisner get_ldev_if_state(mdev, D_NEGOTIATING)) { 3294b411b363SPhilipp Reisner int cr; /* consider resync */ 3295b411b363SPhilipp Reisner 3296b411b363SPhilipp Reisner /* if we established a new connection */ 32974ac4aadaSLars Ellenberg cr = (os.conn < C_CONNECTED); 3298b411b363SPhilipp Reisner /* if we had an established connection 3299b411b363SPhilipp Reisner * and one of the nodes newly attaches a disk */ 33004ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3301b411b363SPhilipp Reisner (peer_state.disk == D_NEGOTIATING || 33024ac4aadaSLars Ellenberg os.disk == D_NEGOTIATING)); 3303b411b363SPhilipp Reisner /* if we have both been inconsistent, and the peer has been 3304b411b363SPhilipp Reisner * forced to be UpToDate with --overwrite-data */ 3305b411b363SPhilipp Reisner cr |= test_bit(CONSIDER_RESYNC, &mdev->flags); 3306b411b363SPhilipp Reisner /* if we had been plain connected, and the admin requested to 3307b411b363SPhilipp Reisner * start a sync by "invalidate" or "invalidate-remote" */ 33084ac4aadaSLars Ellenberg cr |= (os.conn == C_CONNECTED && 3309b411b363SPhilipp Reisner (peer_state.conn >= C_STARTING_SYNC_S && 3310b411b363SPhilipp Reisner peer_state.conn <= C_WF_BITMAP_T)); 3311b411b363SPhilipp Reisner 3312b411b363SPhilipp Reisner if (cr) 33134ac4aadaSLars Ellenberg ns.conn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk); 3314b411b363SPhilipp Reisner 3315b411b363SPhilipp Reisner put_ldev(mdev); 33164ac4aadaSLars Ellenberg if (ns.conn == C_MASK) { 33174ac4aadaSLars Ellenberg ns.conn = C_CONNECTED; 3318b411b363SPhilipp Reisner if (mdev->state.disk == D_NEGOTIATING) { 331982f59cc6SLars Ellenberg drbd_force_state(mdev, NS(disk, D_FAILED)); 3320b411b363SPhilipp Reisner } else if (peer_state.disk == D_NEGOTIATING) { 3321b411b363SPhilipp Reisner dev_err(DEV, "Disk attach process on the peer node was aborted.\n"); 3322b411b363SPhilipp Reisner peer_state.disk = D_DISKLESS; 3323580b9767SLars Ellenberg real_peer_disk = D_DISKLESS; 3324b411b363SPhilipp Reisner } else { 3325cf14c2e9SPhilipp Reisner if (test_and_clear_bit(CONN_DRY_RUN, &mdev->flags)) 332681e84650SAndreas Gruenbacher return false; 33274ac4aadaSLars Ellenberg D_ASSERT(os.conn == C_WF_REPORT_PARAMS); 3328b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 332981e84650SAndreas Gruenbacher return false; 3330b411b363SPhilipp Reisner } 3331b411b363SPhilipp Reisner } 3332b411b363SPhilipp Reisner } 3333b411b363SPhilipp Reisner 333487eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 33354ac4aadaSLars Ellenberg if (mdev->state.i != os.i) 3336b411b363SPhilipp Reisner goto retry; 3337b411b363SPhilipp Reisner clear_bit(CONSIDER_RESYNC, &mdev->flags); 3338b411b363SPhilipp Reisner ns.peer = peer_state.role; 3339b411b363SPhilipp Reisner ns.pdsk = real_peer_disk; 3340b411b363SPhilipp Reisner ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); 33414ac4aadaSLars Ellenberg if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) 3342b411b363SPhilipp Reisner ns.disk = mdev->new_state_tmp.disk; 33434ac4aadaSLars Ellenberg cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); 33444ac4aadaSLars Ellenberg if (ns.pdsk == D_CONSISTENT && is_susp(ns) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && 3345481c6f50SPhilipp Reisner test_bit(NEW_CUR_UUID, &mdev->flags)) { 33468554df1cSAndreas Gruenbacher /* Do not allow tl_restart(RESEND) for a rebooted peer. We can only allow this 3347481c6f50SPhilipp Reisner for temporal network outages! */ 334887eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3349481c6f50SPhilipp Reisner dev_err(DEV, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); 3350481c6f50SPhilipp Reisner tl_clear(mdev); 3351481c6f50SPhilipp Reisner drbd_uuid_new_current(mdev); 3352481c6f50SPhilipp Reisner clear_bit(NEW_CUR_UUID, &mdev->flags); 3353481c6f50SPhilipp Reisner drbd_force_state(mdev, NS2(conn, C_PROTOCOL_ERROR, susp, 0)); 335481e84650SAndreas Gruenbacher return false; 3355481c6f50SPhilipp Reisner } 335665d922c3SPhilipp Reisner rv = _drbd_set_state(mdev, ns, cs_flags, NULL); 3357b411b363SPhilipp Reisner ns = mdev->state; 335887eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3359b411b363SPhilipp Reisner 3360b411b363SPhilipp Reisner if (rv < SS_SUCCESS) { 3361b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 336281e84650SAndreas Gruenbacher return false; 3363b411b363SPhilipp Reisner } 3364b411b363SPhilipp Reisner 33654ac4aadaSLars Ellenberg if (os.conn > C_WF_REPORT_PARAMS) { 33664ac4aadaSLars Ellenberg if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED && 3367b411b363SPhilipp Reisner peer_state.disk != D_NEGOTIATING ) { 3368b411b363SPhilipp Reisner /* we want resync, peer has not yet decided to sync... */ 3369b411b363SPhilipp Reisner /* Nowadays only used when forcing a node into primary role and 3370b411b363SPhilipp Reisner setting its disk to UpToDate with that */ 3371b411b363SPhilipp Reisner drbd_send_uuids(mdev); 3372b411b363SPhilipp Reisner drbd_send_state(mdev); 3373b411b363SPhilipp Reisner } 3374b411b363SPhilipp Reisner } 3375b411b363SPhilipp Reisner 337689e58e75SPhilipp Reisner mdev->tconn->net_conf->want_lose = 0; 3377b411b363SPhilipp Reisner 3378b411b363SPhilipp Reisner drbd_md_sync(mdev); /* update connected indicator, la_size, ... */ 3379b411b363SPhilipp Reisner 338081e84650SAndreas Gruenbacher return true; 3381b411b363SPhilipp Reisner } 3382b411b363SPhilipp Reisner 3383d8763023SAndreas Gruenbacher static int receive_sync_uuid(struct drbd_conf *mdev, enum drbd_packet cmd, 3384d8763023SAndreas Gruenbacher unsigned int data_size) 3385b411b363SPhilipp Reisner { 3386e42325a5SPhilipp Reisner struct p_rs_uuid *p = &mdev->tconn->data.rbuf.rs_uuid; 3387b411b363SPhilipp Reisner 3388b411b363SPhilipp Reisner wait_event(mdev->misc_wait, 3389b411b363SPhilipp Reisner mdev->state.conn == C_WF_SYNC_UUID || 3390c4752ef1SPhilipp Reisner mdev->state.conn == C_BEHIND || 3391b411b363SPhilipp Reisner mdev->state.conn < C_CONNECTED || 3392b411b363SPhilipp Reisner mdev->state.disk < D_NEGOTIATING); 3393b411b363SPhilipp Reisner 3394b411b363SPhilipp Reisner /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */ 3395b411b363SPhilipp Reisner 3396b411b363SPhilipp Reisner /* Here the _drbd_uuid_ functions are right, current should 3397b411b363SPhilipp Reisner _not_ be rotated into the history */ 3398b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_NEGOTIATING)) { 3399b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid)); 3400b411b363SPhilipp Reisner _drbd_uuid_set(mdev, UI_BITMAP, 0UL); 3401b411b363SPhilipp Reisner 340262b0da3aSLars Ellenberg drbd_print_uuids(mdev, "updated sync uuid"); 3403b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_TARGET); 3404b411b363SPhilipp Reisner 3405b411b363SPhilipp Reisner put_ldev(mdev); 3406b411b363SPhilipp Reisner } else 3407b411b363SPhilipp Reisner dev_err(DEV, "Ignoring SyncUUID packet!\n"); 3408b411b363SPhilipp Reisner 340981e84650SAndreas Gruenbacher return true; 3410b411b363SPhilipp Reisner } 3411b411b363SPhilipp Reisner 34122c46407dSAndreas Gruenbacher /** 34132c46407dSAndreas Gruenbacher * receive_bitmap_plain 34142c46407dSAndreas Gruenbacher * 34152c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 34162c46407dSAndreas Gruenbacher * code upon failure. 34172c46407dSAndreas Gruenbacher */ 34182c46407dSAndreas Gruenbacher static int 341902918be2SPhilipp Reisner receive_bitmap_plain(struct drbd_conf *mdev, unsigned int data_size, 3420b411b363SPhilipp Reisner unsigned long *buffer, struct bm_xfer_ctx *c) 3421b411b363SPhilipp Reisner { 3422b411b363SPhilipp Reisner unsigned num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset); 3423b411b363SPhilipp Reisner unsigned want = num_words * sizeof(long); 34242c46407dSAndreas Gruenbacher int err; 3425b411b363SPhilipp Reisner 342602918be2SPhilipp Reisner if (want != data_size) { 342702918be2SPhilipp Reisner dev_err(DEV, "%s:want (%u) != data_size (%u)\n", __func__, want, data_size); 34282c46407dSAndreas Gruenbacher return -EIO; 3429b411b363SPhilipp Reisner } 3430b411b363SPhilipp Reisner if (want == 0) 34312c46407dSAndreas Gruenbacher return 0; 34322c46407dSAndreas Gruenbacher err = drbd_recv(mdev, buffer, want); 34332c46407dSAndreas Gruenbacher if (err != want) { 34342c46407dSAndreas Gruenbacher if (err >= 0) 34352c46407dSAndreas Gruenbacher err = -EIO; 34362c46407dSAndreas Gruenbacher return err; 34372c46407dSAndreas Gruenbacher } 3438b411b363SPhilipp Reisner 3439b411b363SPhilipp Reisner drbd_bm_merge_lel(mdev, c->word_offset, num_words, buffer); 3440b411b363SPhilipp Reisner 3441b411b363SPhilipp Reisner c->word_offset += num_words; 3442b411b363SPhilipp Reisner c->bit_offset = c->word_offset * BITS_PER_LONG; 3443b411b363SPhilipp Reisner if (c->bit_offset > c->bm_bits) 3444b411b363SPhilipp Reisner c->bit_offset = c->bm_bits; 3445b411b363SPhilipp Reisner 34462c46407dSAndreas Gruenbacher return 1; 3447b411b363SPhilipp Reisner } 3448b411b363SPhilipp Reisner 34492c46407dSAndreas Gruenbacher /** 34502c46407dSAndreas Gruenbacher * recv_bm_rle_bits 34512c46407dSAndreas Gruenbacher * 34522c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 34532c46407dSAndreas Gruenbacher * code upon failure. 34542c46407dSAndreas Gruenbacher */ 34552c46407dSAndreas Gruenbacher static int 3456b411b363SPhilipp Reisner recv_bm_rle_bits(struct drbd_conf *mdev, 3457b411b363SPhilipp Reisner struct p_compressed_bm *p, 3458c6d25cfeSPhilipp Reisner struct bm_xfer_ctx *c, 3459c6d25cfeSPhilipp Reisner unsigned int len) 3460b411b363SPhilipp Reisner { 3461b411b363SPhilipp Reisner struct bitstream bs; 3462b411b363SPhilipp Reisner u64 look_ahead; 3463b411b363SPhilipp Reisner u64 rl; 3464b411b363SPhilipp Reisner u64 tmp; 3465b411b363SPhilipp Reisner unsigned long s = c->bit_offset; 3466b411b363SPhilipp Reisner unsigned long e; 3467b411b363SPhilipp Reisner int toggle = DCBP_get_start(p); 3468b411b363SPhilipp Reisner int have; 3469b411b363SPhilipp Reisner int bits; 3470b411b363SPhilipp Reisner 3471b411b363SPhilipp Reisner bitstream_init(&bs, p->code, len, DCBP_get_pad_bits(p)); 3472b411b363SPhilipp Reisner 3473b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &look_ahead, 64); 3474b411b363SPhilipp Reisner if (bits < 0) 34752c46407dSAndreas Gruenbacher return -EIO; 3476b411b363SPhilipp Reisner 3477b411b363SPhilipp Reisner for (have = bits; have > 0; s += rl, toggle = !toggle) { 3478b411b363SPhilipp Reisner bits = vli_decode_bits(&rl, look_ahead); 3479b411b363SPhilipp Reisner if (bits <= 0) 34802c46407dSAndreas Gruenbacher return -EIO; 3481b411b363SPhilipp Reisner 3482b411b363SPhilipp Reisner if (toggle) { 3483b411b363SPhilipp Reisner e = s + rl -1; 3484b411b363SPhilipp Reisner if (e >= c->bm_bits) { 3485b411b363SPhilipp Reisner dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); 34862c46407dSAndreas Gruenbacher return -EIO; 3487b411b363SPhilipp Reisner } 3488b411b363SPhilipp Reisner _drbd_bm_set_bits(mdev, s, e); 3489b411b363SPhilipp Reisner } 3490b411b363SPhilipp Reisner 3491b411b363SPhilipp Reisner if (have < bits) { 3492b411b363SPhilipp Reisner dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", 3493b411b363SPhilipp Reisner have, bits, look_ahead, 3494b411b363SPhilipp Reisner (unsigned int)(bs.cur.b - p->code), 3495b411b363SPhilipp Reisner (unsigned int)bs.buf_len); 34962c46407dSAndreas Gruenbacher return -EIO; 3497b411b363SPhilipp Reisner } 3498b411b363SPhilipp Reisner look_ahead >>= bits; 3499b411b363SPhilipp Reisner have -= bits; 3500b411b363SPhilipp Reisner 3501b411b363SPhilipp Reisner bits = bitstream_get_bits(&bs, &tmp, 64 - have); 3502b411b363SPhilipp Reisner if (bits < 0) 35032c46407dSAndreas Gruenbacher return -EIO; 3504b411b363SPhilipp Reisner look_ahead |= tmp << have; 3505b411b363SPhilipp Reisner have += bits; 3506b411b363SPhilipp Reisner } 3507b411b363SPhilipp Reisner 3508b411b363SPhilipp Reisner c->bit_offset = s; 3509b411b363SPhilipp Reisner bm_xfer_ctx_bit_to_word_offset(c); 3510b411b363SPhilipp Reisner 35112c46407dSAndreas Gruenbacher return (s != c->bm_bits); 3512b411b363SPhilipp Reisner } 3513b411b363SPhilipp Reisner 35142c46407dSAndreas Gruenbacher /** 35152c46407dSAndreas Gruenbacher * decode_bitmap_c 35162c46407dSAndreas Gruenbacher * 35172c46407dSAndreas Gruenbacher * Return 0 when done, 1 when another iteration is needed, and a negative error 35182c46407dSAndreas Gruenbacher * code upon failure. 35192c46407dSAndreas Gruenbacher */ 35202c46407dSAndreas Gruenbacher static int 3521b411b363SPhilipp Reisner decode_bitmap_c(struct drbd_conf *mdev, 3522b411b363SPhilipp Reisner struct p_compressed_bm *p, 3523c6d25cfeSPhilipp Reisner struct bm_xfer_ctx *c, 3524c6d25cfeSPhilipp Reisner unsigned int len) 3525b411b363SPhilipp Reisner { 3526b411b363SPhilipp Reisner if (DCBP_get_code(p) == RLE_VLI_Bits) 3527c6d25cfeSPhilipp Reisner return recv_bm_rle_bits(mdev, p, c, len); 3528b411b363SPhilipp Reisner 3529b411b363SPhilipp Reisner /* other variants had been implemented for evaluation, 3530b411b363SPhilipp Reisner * but have been dropped as this one turned out to be "best" 3531b411b363SPhilipp Reisner * during all our tests. */ 3532b411b363SPhilipp Reisner 3533b411b363SPhilipp Reisner dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding); 3534b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); 35352c46407dSAndreas Gruenbacher return -EIO; 3536b411b363SPhilipp Reisner } 3537b411b363SPhilipp Reisner 3538b411b363SPhilipp Reisner void INFO_bm_xfer_stats(struct drbd_conf *mdev, 3539b411b363SPhilipp Reisner const char *direction, struct bm_xfer_ctx *c) 3540b411b363SPhilipp Reisner { 3541b411b363SPhilipp Reisner /* what would it take to transfer it "plaintext" */ 3542c012949aSPhilipp Reisner unsigned plain = sizeof(struct p_header) * 3543b411b363SPhilipp Reisner ((c->bm_words+BM_PACKET_WORDS-1)/BM_PACKET_WORDS+1) 3544b411b363SPhilipp Reisner + c->bm_words * sizeof(long); 3545b411b363SPhilipp Reisner unsigned total = c->bytes[0] + c->bytes[1]; 3546b411b363SPhilipp Reisner unsigned r; 3547b411b363SPhilipp Reisner 3548b411b363SPhilipp Reisner /* total can not be zero. but just in case: */ 3549b411b363SPhilipp Reisner if (total == 0) 3550b411b363SPhilipp Reisner return; 3551b411b363SPhilipp Reisner 3552b411b363SPhilipp Reisner /* don't report if not compressed */ 3553b411b363SPhilipp Reisner if (total >= plain) 3554b411b363SPhilipp Reisner return; 3555b411b363SPhilipp Reisner 3556b411b363SPhilipp Reisner /* total < plain. check for overflow, still */ 3557b411b363SPhilipp Reisner r = (total > UINT_MAX/1000) ? (total / (plain/1000)) 3558b411b363SPhilipp Reisner : (1000 * total / plain); 3559b411b363SPhilipp Reisner 3560b411b363SPhilipp Reisner if (r > 1000) 3561b411b363SPhilipp Reisner r = 1000; 3562b411b363SPhilipp Reisner 3563b411b363SPhilipp Reisner r = 1000 - r; 3564b411b363SPhilipp Reisner dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " 3565b411b363SPhilipp Reisner "total %u; compression: %u.%u%%\n", 3566b411b363SPhilipp Reisner direction, 3567b411b363SPhilipp Reisner c->bytes[1], c->packets[1], 3568b411b363SPhilipp Reisner c->bytes[0], c->packets[0], 3569b411b363SPhilipp Reisner total, r/10, r % 10); 3570b411b363SPhilipp Reisner } 3571b411b363SPhilipp Reisner 3572b411b363SPhilipp Reisner /* Since we are processing the bitfield from lower addresses to higher, 3573b411b363SPhilipp Reisner it does not matter if the process it in 32 bit chunks or 64 bit 3574b411b363SPhilipp Reisner chunks as long as it is little endian. (Understand it as byte stream, 3575b411b363SPhilipp Reisner beginning with the lowest byte...) If we would use big endian 3576b411b363SPhilipp Reisner we would need to process it from the highest address to the lowest, 3577b411b363SPhilipp Reisner in order to be agnostic to the 32 vs 64 bits issue. 3578b411b363SPhilipp Reisner 3579b411b363SPhilipp Reisner returns 0 on failure, 1 if we successfully received it. */ 3580d8763023SAndreas Gruenbacher static int receive_bitmap(struct drbd_conf *mdev, enum drbd_packet cmd, 3581d8763023SAndreas Gruenbacher unsigned int data_size) 3582b411b363SPhilipp Reisner { 3583b411b363SPhilipp Reisner struct bm_xfer_ctx c; 3584b411b363SPhilipp Reisner void *buffer; 35852c46407dSAndreas Gruenbacher int err; 358681e84650SAndreas Gruenbacher int ok = false; 3587257d0af6SPhilipp Reisner struct p_header *h = &mdev->tconn->data.rbuf.header; 3588b411b363SPhilipp Reisner 358920ceb2b2SLars Ellenberg drbd_bm_lock(mdev, "receive bitmap", BM_LOCKED_SET_ALLOWED); 359020ceb2b2SLars Ellenberg /* you are supposed to send additional out-of-sync information 359120ceb2b2SLars Ellenberg * if you actually set bits during this phase */ 3592b411b363SPhilipp Reisner 3593b411b363SPhilipp Reisner /* maybe we should use some per thread scratch page, 3594b411b363SPhilipp Reisner * and allocate that during initial device creation? */ 3595b411b363SPhilipp Reisner buffer = (unsigned long *) __get_free_page(GFP_NOIO); 3596b411b363SPhilipp Reisner if (!buffer) { 3597b411b363SPhilipp Reisner dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__); 3598b411b363SPhilipp Reisner goto out; 3599b411b363SPhilipp Reisner } 3600b411b363SPhilipp Reisner 3601b411b363SPhilipp Reisner c = (struct bm_xfer_ctx) { 3602b411b363SPhilipp Reisner .bm_bits = drbd_bm_bits(mdev), 3603b411b363SPhilipp Reisner .bm_words = drbd_bm_words(mdev), 3604b411b363SPhilipp Reisner }; 3605b411b363SPhilipp Reisner 36062c46407dSAndreas Gruenbacher for(;;) { 360702918be2SPhilipp Reisner if (cmd == P_BITMAP) { 36082c46407dSAndreas Gruenbacher err = receive_bitmap_plain(mdev, data_size, buffer, &c); 360902918be2SPhilipp Reisner } else if (cmd == P_COMPRESSED_BITMAP) { 3610b411b363SPhilipp Reisner /* MAYBE: sanity check that we speak proto >= 90, 3611b411b363SPhilipp Reisner * and the feature is enabled! */ 3612b411b363SPhilipp Reisner struct p_compressed_bm *p; 3613b411b363SPhilipp Reisner 361402918be2SPhilipp Reisner if (data_size > BM_PACKET_PAYLOAD_BYTES) { 3615b411b363SPhilipp Reisner dev_err(DEV, "ReportCBitmap packet too large\n"); 3616b411b363SPhilipp Reisner goto out; 3617b411b363SPhilipp Reisner } 3618b411b363SPhilipp Reisner /* use the page buff */ 3619b411b363SPhilipp Reisner p = buffer; 3620b411b363SPhilipp Reisner memcpy(p, h, sizeof(*h)); 362102918be2SPhilipp Reisner if (drbd_recv(mdev, p->head.payload, data_size) != data_size) 3622b411b363SPhilipp Reisner goto out; 3623004352faSLars Ellenberg if (data_size <= (sizeof(*p) - sizeof(p->head))) { 3624004352faSLars Ellenberg dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", data_size); 362578fcbdaeSAndreas Gruenbacher goto out; 3626b411b363SPhilipp Reisner } 3627c6d25cfeSPhilipp Reisner err = decode_bitmap_c(mdev, p, &c, data_size); 3628b411b363SPhilipp Reisner } else { 362902918be2SPhilipp Reisner dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", cmd); 3630b411b363SPhilipp Reisner goto out; 3631b411b363SPhilipp Reisner } 3632b411b363SPhilipp Reisner 363302918be2SPhilipp Reisner c.packets[cmd == P_BITMAP]++; 3634257d0af6SPhilipp Reisner c.bytes[cmd == P_BITMAP] += sizeof(struct p_header) + data_size; 3635b411b363SPhilipp Reisner 36362c46407dSAndreas Gruenbacher if (err <= 0) { 36372c46407dSAndreas Gruenbacher if (err < 0) 36382c46407dSAndreas Gruenbacher goto out; 3639b411b363SPhilipp Reisner break; 36402c46407dSAndreas Gruenbacher } 364102918be2SPhilipp Reisner if (!drbd_recv_header(mdev, &cmd, &data_size)) 3642b411b363SPhilipp Reisner goto out; 36432c46407dSAndreas Gruenbacher } 3644b411b363SPhilipp Reisner 3645b411b363SPhilipp Reisner INFO_bm_xfer_stats(mdev, "receive", &c); 3646b411b363SPhilipp Reisner 3647b411b363SPhilipp Reisner if (mdev->state.conn == C_WF_BITMAP_T) { 3648de1f8e4aSAndreas Gruenbacher enum drbd_state_rv rv; 3649de1f8e4aSAndreas Gruenbacher 3650b411b363SPhilipp Reisner ok = !drbd_send_bitmap(mdev); 3651b411b363SPhilipp Reisner if (!ok) 3652b411b363SPhilipp Reisner goto out; 3653b411b363SPhilipp Reisner /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ 3654de1f8e4aSAndreas Gruenbacher rv = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); 3655de1f8e4aSAndreas Gruenbacher D_ASSERT(rv == SS_SUCCESS); 3656b411b363SPhilipp Reisner } else if (mdev->state.conn != C_WF_BITMAP_S) { 3657b411b363SPhilipp Reisner /* admin may have requested C_DISCONNECTING, 3658b411b363SPhilipp Reisner * other threads may have noticed network errors */ 3659b411b363SPhilipp Reisner dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n", 3660b411b363SPhilipp Reisner drbd_conn_str(mdev->state.conn)); 3661b411b363SPhilipp Reisner } 3662b411b363SPhilipp Reisner 366381e84650SAndreas Gruenbacher ok = true; 3664b411b363SPhilipp Reisner out: 366520ceb2b2SLars Ellenberg drbd_bm_unlock(mdev); 3666b411b363SPhilipp Reisner if (ok && mdev->state.conn == C_WF_BITMAP_S) 3667b411b363SPhilipp Reisner drbd_start_resync(mdev, C_SYNC_SOURCE); 3668b411b363SPhilipp Reisner free_page((unsigned long) buffer); 3669b411b363SPhilipp Reisner return ok; 3670b411b363SPhilipp Reisner } 3671b411b363SPhilipp Reisner 3672d8763023SAndreas Gruenbacher static int receive_skip(struct drbd_conf *mdev, enum drbd_packet cmd, 3673d8763023SAndreas Gruenbacher unsigned int data_size) 3674b411b363SPhilipp Reisner { 3675b411b363SPhilipp Reisner /* TODO zero copy sink :) */ 3676b411b363SPhilipp Reisner static char sink[128]; 3677b411b363SPhilipp Reisner int size, want, r; 3678b411b363SPhilipp Reisner 3679b411b363SPhilipp Reisner dev_warn(DEV, "skipping unknown optional packet type %d, l: %d!\n", 368002918be2SPhilipp Reisner cmd, data_size); 3681b411b363SPhilipp Reisner 368202918be2SPhilipp Reisner size = data_size; 3683b411b363SPhilipp Reisner while (size > 0) { 3684b411b363SPhilipp Reisner want = min_t(int, size, sizeof(sink)); 3685b411b363SPhilipp Reisner r = drbd_recv(mdev, sink, want); 3686841ce241SAndreas Gruenbacher if (!expect(r > 0)) 3687841ce241SAndreas Gruenbacher break; 3688b411b363SPhilipp Reisner size -= r; 3689b411b363SPhilipp Reisner } 3690b411b363SPhilipp Reisner return size == 0; 3691b411b363SPhilipp Reisner } 3692b411b363SPhilipp Reisner 3693d8763023SAndreas Gruenbacher static int receive_UnplugRemote(struct drbd_conf *mdev, enum drbd_packet cmd, 3694d8763023SAndreas Gruenbacher unsigned int data_size) 3695b411b363SPhilipp Reisner { 3696b411b363SPhilipp Reisner /* Make sure we've acked all the TCP data associated 3697b411b363SPhilipp Reisner * with the data requests being unplugged */ 3698e42325a5SPhilipp Reisner drbd_tcp_quickack(mdev->tconn->data.socket); 3699b411b363SPhilipp Reisner 370081e84650SAndreas Gruenbacher return true; 3701b411b363SPhilipp Reisner } 3702b411b363SPhilipp Reisner 3703d8763023SAndreas Gruenbacher static int receive_out_of_sync(struct drbd_conf *mdev, enum drbd_packet cmd, 3704d8763023SAndreas Gruenbacher unsigned int data_size) 370573a01a18SPhilipp Reisner { 3706e42325a5SPhilipp Reisner struct p_block_desc *p = &mdev->tconn->data.rbuf.block_desc; 370773a01a18SPhilipp Reisner 3708f735e363SLars Ellenberg switch (mdev->state.conn) { 3709f735e363SLars Ellenberg case C_WF_SYNC_UUID: 3710f735e363SLars Ellenberg case C_WF_BITMAP_T: 3711f735e363SLars Ellenberg case C_BEHIND: 3712f735e363SLars Ellenberg break; 3713f735e363SLars Ellenberg default: 3714f735e363SLars Ellenberg dev_err(DEV, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n", 3715f735e363SLars Ellenberg drbd_conn_str(mdev->state.conn)); 3716f735e363SLars Ellenberg } 3717f735e363SLars Ellenberg 371873a01a18SPhilipp Reisner drbd_set_out_of_sync(mdev, be64_to_cpu(p->sector), be32_to_cpu(p->blksize)); 371973a01a18SPhilipp Reisner 372081e84650SAndreas Gruenbacher return true; 372173a01a18SPhilipp Reisner } 372273a01a18SPhilipp Reisner 3723d8763023SAndreas Gruenbacher typedef int (*drbd_cmd_handler_f)(struct drbd_conf *, enum drbd_packet cmd, 3724d8763023SAndreas Gruenbacher unsigned int to_receive); 3725b411b363SPhilipp Reisner 372602918be2SPhilipp Reisner struct data_cmd { 372702918be2SPhilipp Reisner int expect_payload; 372802918be2SPhilipp Reisner size_t pkt_size; 372902918be2SPhilipp Reisner drbd_cmd_handler_f function; 3730b411b363SPhilipp Reisner }; 3731b411b363SPhilipp Reisner 373202918be2SPhilipp Reisner static struct data_cmd drbd_cmd_handler[] = { 373302918be2SPhilipp Reisner [P_DATA] = { 1, sizeof(struct p_data), receive_Data }, 373402918be2SPhilipp Reisner [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply }, 373502918be2SPhilipp Reisner [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } , 373602918be2SPhilipp Reisner [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } , 3737257d0af6SPhilipp Reisner [P_BITMAP] = { 1, sizeof(struct p_header), receive_bitmap } , 3738257d0af6SPhilipp Reisner [P_COMPRESSED_BITMAP] = { 1, sizeof(struct p_header), receive_bitmap } , 3739257d0af6SPhilipp Reisner [P_UNPLUG_REMOTE] = { 0, sizeof(struct p_header), receive_UnplugRemote }, 374002918be2SPhilipp Reisner [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 374102918be2SPhilipp Reisner [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 3742257d0af6SPhilipp Reisner [P_SYNC_PARAM] = { 1, sizeof(struct p_header), receive_SyncParam }, 3743257d0af6SPhilipp Reisner [P_SYNC_PARAM89] = { 1, sizeof(struct p_header), receive_SyncParam }, 374402918be2SPhilipp Reisner [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol }, 374502918be2SPhilipp Reisner [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids }, 374602918be2SPhilipp Reisner [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes }, 374702918be2SPhilipp Reisner [P_STATE] = { 0, sizeof(struct p_state), receive_state }, 374802918be2SPhilipp Reisner [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state }, 374902918be2SPhilipp Reisner [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid }, 375002918be2SPhilipp Reisner [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, 375102918be2SPhilipp Reisner [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 375202918be2SPhilipp Reisner [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest }, 375302918be2SPhilipp Reisner [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip }, 375473a01a18SPhilipp Reisner [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync }, 375502918be2SPhilipp Reisner /* anything missing from this table is in 375602918be2SPhilipp Reisner * the asender_tbl, see get_asender_cmd */ 375702918be2SPhilipp Reisner [P_MAX_CMD] = { 0, 0, NULL }, 375802918be2SPhilipp Reisner }; 375902918be2SPhilipp Reisner 376002918be2SPhilipp Reisner /* All handler functions that expect a sub-header get that sub-heder in 3761e42325a5SPhilipp Reisner mdev->tconn->data.rbuf.header.head.payload. 376202918be2SPhilipp Reisner 3763e42325a5SPhilipp Reisner Usually in mdev->tconn->data.rbuf.header.head the callback can find the usual 376402918be2SPhilipp Reisner p_header, but they may not rely on that. Since there is also p_header95 ! 376502918be2SPhilipp Reisner */ 3766b411b363SPhilipp Reisner 3767b411b363SPhilipp Reisner static void drbdd(struct drbd_conf *mdev) 3768b411b363SPhilipp Reisner { 3769c012949aSPhilipp Reisner struct p_header *header = &mdev->tconn->data.rbuf.header; 377002918be2SPhilipp Reisner unsigned int packet_size; 3771d8763023SAndreas Gruenbacher enum drbd_packet cmd; 377202918be2SPhilipp Reisner size_t shs; /* sub header size */ 377302918be2SPhilipp Reisner int rv; 3774b411b363SPhilipp Reisner 3775e6b3ea83SPhilipp Reisner while (get_t_state(&mdev->tconn->receiver) == RUNNING) { 3776b411b363SPhilipp Reisner drbd_thread_current_set_cpu(mdev); 377702918be2SPhilipp Reisner if (!drbd_recv_header(mdev, &cmd, &packet_size)) 377802918be2SPhilipp Reisner goto err_out; 377902918be2SPhilipp Reisner 378002918be2SPhilipp Reisner if (unlikely(cmd >= P_MAX_CMD || !drbd_cmd_handler[cmd].function)) { 378102918be2SPhilipp Reisner dev_err(DEV, "unknown packet type %d, l: %d!\n", cmd, packet_size); 378202918be2SPhilipp Reisner goto err_out; 37830b33a916SLars Ellenberg } 3784b411b363SPhilipp Reisner 3785c012949aSPhilipp Reisner shs = drbd_cmd_handler[cmd].pkt_size - sizeof(struct p_header); 3786c13f7e1aSLars Ellenberg if (packet_size - shs > 0 && !drbd_cmd_handler[cmd].expect_payload) { 3787c13f7e1aSLars Ellenberg dev_err(DEV, "No payload expected %s l:%d\n", cmdname(cmd), packet_size); 3788c13f7e1aSLars Ellenberg goto err_out; 3789c13f7e1aSLars Ellenberg } 3790c13f7e1aSLars Ellenberg 3791c13f7e1aSLars Ellenberg if (shs) { 3792c012949aSPhilipp Reisner rv = drbd_recv(mdev, &header->payload, shs); 379302918be2SPhilipp Reisner if (unlikely(rv != shs)) { 37940ddc5549SLars Ellenberg if (!signal_pending(current)) 37950ddc5549SLars Ellenberg dev_warn(DEV, "short read while reading sub header: rv=%d\n", rv); 379602918be2SPhilipp Reisner goto err_out; 3797b411b363SPhilipp Reisner } 379802918be2SPhilipp Reisner } 379902918be2SPhilipp Reisner 380002918be2SPhilipp Reisner rv = drbd_cmd_handler[cmd].function(mdev, cmd, packet_size - shs); 380102918be2SPhilipp Reisner 380202918be2SPhilipp Reisner if (unlikely(!rv)) { 3803b411b363SPhilipp Reisner dev_err(DEV, "error receiving %s, l: %d!\n", 380402918be2SPhilipp Reisner cmdname(cmd), packet_size); 380502918be2SPhilipp Reisner goto err_out; 3806b411b363SPhilipp Reisner } 3807b411b363SPhilipp Reisner } 380802918be2SPhilipp Reisner 380902918be2SPhilipp Reisner if (0) { 381002918be2SPhilipp Reisner err_out: 3811b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); 3812b411b363SPhilipp Reisner } 3813856c50c7SLars Ellenberg /* If we leave here, we probably want to update at least the 3814856c50c7SLars Ellenberg * "Connected" indicator on stable storage. Do so explicitly here. */ 3815856c50c7SLars Ellenberg drbd_md_sync(mdev); 3816b411b363SPhilipp Reisner } 3817b411b363SPhilipp Reisner 3818191d3cc8SPhilipp Reisner void drbd_flush_workqueue(struct drbd_tconn *tconn) 3819b411b363SPhilipp Reisner { 3820b411b363SPhilipp Reisner struct drbd_wq_barrier barr; 3821b411b363SPhilipp Reisner 3822b411b363SPhilipp Reisner barr.w.cb = w_prev_work_done; 3823b411b363SPhilipp Reisner init_completion(&barr.done); 3824191d3cc8SPhilipp Reisner drbd_queue_work(&tconn->data.work, &barr.w); 3825b411b363SPhilipp Reisner wait_for_completion(&barr.done); 3826b411b363SPhilipp Reisner } 3827b411b363SPhilipp Reisner 3828b411b363SPhilipp Reisner static void drbd_disconnect(struct drbd_conf *mdev) 3829b411b363SPhilipp Reisner { 3830b411b363SPhilipp Reisner enum drbd_fencing_p fp; 3831b411b363SPhilipp Reisner union drbd_state os, ns; 3832b411b363SPhilipp Reisner int rv = SS_UNKNOWN_ERROR; 3833b411b363SPhilipp Reisner unsigned int i; 3834b411b363SPhilipp Reisner 3835b411b363SPhilipp Reisner if (mdev->state.conn == C_STANDALONE) 3836b411b363SPhilipp Reisner return; 3837b411b363SPhilipp Reisner 3838b411b363SPhilipp Reisner /* asender does not clean up anything. it must not interfere, either */ 3839e6b3ea83SPhilipp Reisner drbd_thread_stop(&mdev->tconn->asender); 3840b411b363SPhilipp Reisner drbd_free_sock(mdev); 3841b411b363SPhilipp Reisner 384285719573SPhilipp Reisner /* wait for current activity to cease. */ 384387eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 3844b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->active_ee); 3845b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee); 3846b411b363SPhilipp Reisner _drbd_wait_ee_list_empty(mdev, &mdev->read_ee); 384787eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3848b411b363SPhilipp Reisner 3849b411b363SPhilipp Reisner /* We do not have data structures that would allow us to 3850b411b363SPhilipp Reisner * get the rs_pending_cnt down to 0 again. 3851b411b363SPhilipp Reisner * * On C_SYNC_TARGET we do not have any data structures describing 3852b411b363SPhilipp Reisner * the pending RSDataRequest's we have sent. 3853b411b363SPhilipp Reisner * * On C_SYNC_SOURCE there is no data structure that tracks 3854b411b363SPhilipp Reisner * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. 3855b411b363SPhilipp Reisner * And no, it is not the sum of the reference counts in the 3856b411b363SPhilipp Reisner * resync_LRU. The resync_LRU tracks the whole operation including 3857b411b363SPhilipp Reisner * the disk-IO, while the rs_pending_cnt only tracks the blocks 3858b411b363SPhilipp Reisner * on the fly. */ 3859b411b363SPhilipp Reisner drbd_rs_cancel_all(mdev); 3860b411b363SPhilipp Reisner mdev->rs_total = 0; 3861b411b363SPhilipp Reisner mdev->rs_failed = 0; 3862b411b363SPhilipp Reisner atomic_set(&mdev->rs_pending_cnt, 0); 3863b411b363SPhilipp Reisner wake_up(&mdev->misc_wait); 3864b411b363SPhilipp Reisner 38657fde2be9SPhilipp Reisner del_timer(&mdev->request_timer); 38667fde2be9SPhilipp Reisner 3867b411b363SPhilipp Reisner /* make sure syncer is stopped and w_resume_next_sg queued */ 3868b411b363SPhilipp Reisner del_timer_sync(&mdev->resync_timer); 3869b411b363SPhilipp Reisner resync_timer_fn((unsigned long)mdev); 3870b411b363SPhilipp Reisner 3871b411b363SPhilipp Reisner /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, 3872b411b363SPhilipp Reisner * w_make_resync_request etc. which may still be on the worker queue 3873b411b363SPhilipp Reisner * to be "canceled" */ 3874191d3cc8SPhilipp Reisner drbd_flush_workqueue(mdev->tconn); 3875b411b363SPhilipp Reisner 3876b411b363SPhilipp Reisner /* This also does reclaim_net_ee(). If we do this too early, we might 3877b411b363SPhilipp Reisner * miss some resync ee and pages.*/ 3878b411b363SPhilipp Reisner drbd_process_done_ee(mdev); 3879b411b363SPhilipp Reisner 3880b411b363SPhilipp Reisner kfree(mdev->p_uuid); 3881b411b363SPhilipp Reisner mdev->p_uuid = NULL; 3882b411b363SPhilipp Reisner 3883fb22c402SPhilipp Reisner if (!is_susp(mdev->state)) 3884b411b363SPhilipp Reisner tl_clear(mdev); 3885b411b363SPhilipp Reisner 3886b411b363SPhilipp Reisner dev_info(DEV, "Connection closed\n"); 3887b411b363SPhilipp Reisner 3888b411b363SPhilipp Reisner drbd_md_sync(mdev); 3889b411b363SPhilipp Reisner 3890b411b363SPhilipp Reisner fp = FP_DONT_CARE; 3891b411b363SPhilipp Reisner if (get_ldev(mdev)) { 3892b411b363SPhilipp Reisner fp = mdev->ldev->dc.fencing; 3893b411b363SPhilipp Reisner put_ldev(mdev); 3894b411b363SPhilipp Reisner } 3895b411b363SPhilipp Reisner 389687f7be4cSPhilipp Reisner if (mdev->state.role == R_PRIMARY && fp >= FP_RESOURCE && mdev->state.pdsk >= D_UNKNOWN) 389787f7be4cSPhilipp Reisner drbd_try_outdate_peer_async(mdev); 3898b411b363SPhilipp Reisner 389987eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 3900b411b363SPhilipp Reisner os = mdev->state; 3901b411b363SPhilipp Reisner if (os.conn >= C_UNCONNECTED) { 3902b411b363SPhilipp Reisner /* Do not restart in case we are C_DISCONNECTING */ 3903b411b363SPhilipp Reisner ns = os; 3904b411b363SPhilipp Reisner ns.conn = C_UNCONNECTED; 3905b411b363SPhilipp Reisner rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); 3906b411b363SPhilipp Reisner } 390787eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 3908b411b363SPhilipp Reisner 3909b411b363SPhilipp Reisner if (os.conn == C_DISCONNECTING) { 3910b2fb6dbeSPhilipp Reisner wait_event(mdev->tconn->net_cnt_wait, atomic_read(&mdev->tconn->net_cnt) == 0); 3911b411b363SPhilipp Reisner 3912a0638456SPhilipp Reisner crypto_free_hash(mdev->tconn->cram_hmac_tfm); 3913a0638456SPhilipp Reisner mdev->tconn->cram_hmac_tfm = NULL; 3914b411b363SPhilipp Reisner 391589e58e75SPhilipp Reisner kfree(mdev->tconn->net_conf); 391689e58e75SPhilipp Reisner mdev->tconn->net_conf = NULL; 3917b411b363SPhilipp Reisner drbd_request_state(mdev, NS(conn, C_STANDALONE)); 3918b411b363SPhilipp Reisner } 3919b411b363SPhilipp Reisner 392020ceb2b2SLars Ellenberg /* serialize with bitmap writeout triggered by the state change, 392120ceb2b2SLars Ellenberg * if any. */ 392220ceb2b2SLars Ellenberg wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags)); 392320ceb2b2SLars Ellenberg 3924b411b363SPhilipp Reisner /* tcp_close and release of sendpage pages can be deferred. I don't 3925b411b363SPhilipp Reisner * want to use SO_LINGER, because apparently it can be deferred for 3926b411b363SPhilipp Reisner * more than 20 seconds (longest time I checked). 3927b411b363SPhilipp Reisner * 3928b411b363SPhilipp Reisner * Actually we don't care for exactly when the network stack does its 3929b411b363SPhilipp Reisner * put_page(), but release our reference on these pages right here. 3930b411b363SPhilipp Reisner */ 3931b411b363SPhilipp Reisner i = drbd_release_ee(mdev, &mdev->net_ee); 3932b411b363SPhilipp Reisner if (i) 3933b411b363SPhilipp Reisner dev_info(DEV, "net_ee not empty, killed %u entries\n", i); 3934435f0740SLars Ellenberg i = atomic_read(&mdev->pp_in_use_by_net); 3935435f0740SLars Ellenberg if (i) 3936435f0740SLars Ellenberg dev_info(DEV, "pp_in_use_by_net = %d, expected 0\n", i); 3937b411b363SPhilipp Reisner i = atomic_read(&mdev->pp_in_use); 3938b411b363SPhilipp Reisner if (i) 393945bb912bSLars Ellenberg dev_info(DEV, "pp_in_use = %d, expected 0\n", i); 3940b411b363SPhilipp Reisner 3941b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->read_ee)); 3942b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->active_ee)); 3943b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->sync_ee)); 3944b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->done_ee)); 3945b411b363SPhilipp Reisner 3946b411b363SPhilipp Reisner /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ 3947b411b363SPhilipp Reisner atomic_set(&mdev->current_epoch->epoch_size, 0); 3948b411b363SPhilipp Reisner D_ASSERT(list_empty(&mdev->current_epoch->list)); 3949b411b363SPhilipp Reisner } 3950b411b363SPhilipp Reisner 3951b411b363SPhilipp Reisner /* 3952b411b363SPhilipp Reisner * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version 3953b411b363SPhilipp Reisner * we can agree on is stored in agreed_pro_version. 3954b411b363SPhilipp Reisner * 3955b411b363SPhilipp Reisner * feature flags and the reserved array should be enough room for future 3956b411b363SPhilipp Reisner * enhancements of the handshake protocol, and possible plugins... 3957b411b363SPhilipp Reisner * 3958b411b363SPhilipp Reisner * for now, they are expected to be zero, but ignored. 3959b411b363SPhilipp Reisner */ 3960b411b363SPhilipp Reisner static int drbd_send_handshake(struct drbd_conf *mdev) 3961b411b363SPhilipp Reisner { 3962e6b3ea83SPhilipp Reisner /* ASSERT current == mdev->tconn->receiver ... */ 3963e42325a5SPhilipp Reisner struct p_handshake *p = &mdev->tconn->data.sbuf.handshake; 3964b411b363SPhilipp Reisner int ok; 3965b411b363SPhilipp Reisner 3966e42325a5SPhilipp Reisner if (mutex_lock_interruptible(&mdev->tconn->data.mutex)) { 3967b411b363SPhilipp Reisner dev_err(DEV, "interrupted during initial handshake\n"); 3968b411b363SPhilipp Reisner return 0; /* interrupted. not ok. */ 3969b411b363SPhilipp Reisner } 3970b411b363SPhilipp Reisner 3971e42325a5SPhilipp Reisner if (mdev->tconn->data.socket == NULL) { 3972e42325a5SPhilipp Reisner mutex_unlock(&mdev->tconn->data.mutex); 3973b411b363SPhilipp Reisner return 0; 3974b411b363SPhilipp Reisner } 3975b411b363SPhilipp Reisner 3976b411b363SPhilipp Reisner memset(p, 0, sizeof(*p)); 3977b411b363SPhilipp Reisner p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); 3978b411b363SPhilipp Reisner p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); 3979e42325a5SPhilipp Reisner ok = _drbd_send_cmd(mdev, mdev->tconn->data.socket, P_HAND_SHAKE, 3980c012949aSPhilipp Reisner &p->head, sizeof(*p), 0 ); 3981e42325a5SPhilipp Reisner mutex_unlock(&mdev->tconn->data.mutex); 3982b411b363SPhilipp Reisner return ok; 3983b411b363SPhilipp Reisner } 3984b411b363SPhilipp Reisner 3985b411b363SPhilipp Reisner /* 3986b411b363SPhilipp Reisner * return values: 3987b411b363SPhilipp Reisner * 1 yes, we have a valid connection 3988b411b363SPhilipp Reisner * 0 oops, did not work out, please try again 3989b411b363SPhilipp Reisner * -1 peer talks different language, 3990b411b363SPhilipp Reisner * no point in trying again, please go standalone. 3991b411b363SPhilipp Reisner */ 3992b411b363SPhilipp Reisner static int drbd_do_handshake(struct drbd_conf *mdev) 3993b411b363SPhilipp Reisner { 3994e6b3ea83SPhilipp Reisner /* ASSERT current == mdev->tconn->receiver ... */ 3995e42325a5SPhilipp Reisner struct p_handshake *p = &mdev->tconn->data.rbuf.handshake; 399602918be2SPhilipp Reisner const int expect = sizeof(struct p_handshake) - sizeof(struct p_header80); 399702918be2SPhilipp Reisner unsigned int length; 3998d8763023SAndreas Gruenbacher enum drbd_packet cmd; 3999b411b363SPhilipp Reisner int rv; 4000b411b363SPhilipp Reisner 4001b411b363SPhilipp Reisner rv = drbd_send_handshake(mdev); 4002b411b363SPhilipp Reisner if (!rv) 4003b411b363SPhilipp Reisner return 0; 4004b411b363SPhilipp Reisner 400502918be2SPhilipp Reisner rv = drbd_recv_header(mdev, &cmd, &length); 4006b411b363SPhilipp Reisner if (!rv) 4007b411b363SPhilipp Reisner return 0; 4008b411b363SPhilipp Reisner 400902918be2SPhilipp Reisner if (cmd != P_HAND_SHAKE) { 4010b411b363SPhilipp Reisner dev_err(DEV, "expected HandShake packet, received: %s (0x%04x)\n", 401102918be2SPhilipp Reisner cmdname(cmd), cmd); 4012b411b363SPhilipp Reisner return -1; 4013b411b363SPhilipp Reisner } 4014b411b363SPhilipp Reisner 401502918be2SPhilipp Reisner if (length != expect) { 4016b411b363SPhilipp Reisner dev_err(DEV, "expected HandShake length: %u, received: %u\n", 401702918be2SPhilipp Reisner expect, length); 4018b411b363SPhilipp Reisner return -1; 4019b411b363SPhilipp Reisner } 4020b411b363SPhilipp Reisner 4021b411b363SPhilipp Reisner rv = drbd_recv(mdev, &p->head.payload, expect); 4022b411b363SPhilipp Reisner 4023b411b363SPhilipp Reisner if (rv != expect) { 40240ddc5549SLars Ellenberg if (!signal_pending(current)) 40250ddc5549SLars Ellenberg dev_warn(DEV, "short read receiving handshake packet: l=%u\n", rv); 4026b411b363SPhilipp Reisner return 0; 4027b411b363SPhilipp Reisner } 4028b411b363SPhilipp Reisner 4029b411b363SPhilipp Reisner p->protocol_min = be32_to_cpu(p->protocol_min); 4030b411b363SPhilipp Reisner p->protocol_max = be32_to_cpu(p->protocol_max); 4031b411b363SPhilipp Reisner if (p->protocol_max == 0) 4032b411b363SPhilipp Reisner p->protocol_max = p->protocol_min; 4033b411b363SPhilipp Reisner 4034b411b363SPhilipp Reisner if (PRO_VERSION_MAX < p->protocol_min || 4035b411b363SPhilipp Reisner PRO_VERSION_MIN > p->protocol_max) 4036b411b363SPhilipp Reisner goto incompat; 4037b411b363SPhilipp Reisner 403831890f4aSPhilipp Reisner mdev->tconn->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); 4039b411b363SPhilipp Reisner 4040b411b363SPhilipp Reisner dev_info(DEV, "Handshake successful: " 404131890f4aSPhilipp Reisner "Agreed network protocol version %d\n", mdev->tconn->agreed_pro_version); 4042b411b363SPhilipp Reisner 4043b411b363SPhilipp Reisner return 1; 4044b411b363SPhilipp Reisner 4045b411b363SPhilipp Reisner incompat: 4046b411b363SPhilipp Reisner dev_err(DEV, "incompatible DRBD dialects: " 4047b411b363SPhilipp Reisner "I support %d-%d, peer supports %d-%d\n", 4048b411b363SPhilipp Reisner PRO_VERSION_MIN, PRO_VERSION_MAX, 4049b411b363SPhilipp Reisner p->protocol_min, p->protocol_max); 4050b411b363SPhilipp Reisner return -1; 4051b411b363SPhilipp Reisner } 4052b411b363SPhilipp Reisner 4053b411b363SPhilipp Reisner #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) 4054b411b363SPhilipp Reisner static int drbd_do_auth(struct drbd_conf *mdev) 4055b411b363SPhilipp Reisner { 4056b411b363SPhilipp Reisner dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); 4057b411b363SPhilipp Reisner dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); 4058b10d96cbSJohannes Thoma return -1; 4059b411b363SPhilipp Reisner } 4060b411b363SPhilipp Reisner #else 4061b411b363SPhilipp Reisner #define CHALLENGE_LEN 64 4062b10d96cbSJohannes Thoma 4063b10d96cbSJohannes Thoma /* Return value: 4064b10d96cbSJohannes Thoma 1 - auth succeeded, 4065b10d96cbSJohannes Thoma 0 - failed, try again (network error), 4066b10d96cbSJohannes Thoma -1 - auth failed, don't try again. 4067b10d96cbSJohannes Thoma */ 4068b10d96cbSJohannes Thoma 4069b411b363SPhilipp Reisner static int drbd_do_auth(struct drbd_conf *mdev) 4070b411b363SPhilipp Reisner { 4071b411b363SPhilipp Reisner char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ 4072b411b363SPhilipp Reisner struct scatterlist sg; 4073b411b363SPhilipp Reisner char *response = NULL; 4074b411b363SPhilipp Reisner char *right_response = NULL; 4075b411b363SPhilipp Reisner char *peers_ch = NULL; 407689e58e75SPhilipp Reisner unsigned int key_len = strlen(mdev->tconn->net_conf->shared_secret); 4077b411b363SPhilipp Reisner unsigned int resp_size; 4078b411b363SPhilipp Reisner struct hash_desc desc; 4079d8763023SAndreas Gruenbacher enum drbd_packet cmd; 408002918be2SPhilipp Reisner unsigned int length; 4081b411b363SPhilipp Reisner int rv; 4082b411b363SPhilipp Reisner 4083a0638456SPhilipp Reisner desc.tfm = mdev->tconn->cram_hmac_tfm; 4084b411b363SPhilipp Reisner desc.flags = 0; 4085b411b363SPhilipp Reisner 4086a0638456SPhilipp Reisner rv = crypto_hash_setkey(mdev->tconn->cram_hmac_tfm, 408789e58e75SPhilipp Reisner (u8 *)mdev->tconn->net_conf->shared_secret, key_len); 4088b411b363SPhilipp Reisner if (rv) { 4089b411b363SPhilipp Reisner dev_err(DEV, "crypto_hash_setkey() failed with %d\n", rv); 4090b10d96cbSJohannes Thoma rv = -1; 4091b411b363SPhilipp Reisner goto fail; 4092b411b363SPhilipp Reisner } 4093b411b363SPhilipp Reisner 4094b411b363SPhilipp Reisner get_random_bytes(my_challenge, CHALLENGE_LEN); 4095b411b363SPhilipp Reisner 4096b411b363SPhilipp Reisner rv = drbd_send_cmd2(mdev, P_AUTH_CHALLENGE, my_challenge, CHALLENGE_LEN); 4097b411b363SPhilipp Reisner if (!rv) 4098b411b363SPhilipp Reisner goto fail; 4099b411b363SPhilipp Reisner 410002918be2SPhilipp Reisner rv = drbd_recv_header(mdev, &cmd, &length); 4101b411b363SPhilipp Reisner if (!rv) 4102b411b363SPhilipp Reisner goto fail; 4103b411b363SPhilipp Reisner 410402918be2SPhilipp Reisner if (cmd != P_AUTH_CHALLENGE) { 4105b411b363SPhilipp Reisner dev_err(DEV, "expected AuthChallenge packet, received: %s (0x%04x)\n", 410602918be2SPhilipp Reisner cmdname(cmd), cmd); 4107b411b363SPhilipp Reisner rv = 0; 4108b411b363SPhilipp Reisner goto fail; 4109b411b363SPhilipp Reisner } 4110b411b363SPhilipp Reisner 411102918be2SPhilipp Reisner if (length > CHALLENGE_LEN * 2) { 4112b411b363SPhilipp Reisner dev_err(DEV, "expected AuthChallenge payload too big.\n"); 4113b10d96cbSJohannes Thoma rv = -1; 4114b411b363SPhilipp Reisner goto fail; 4115b411b363SPhilipp Reisner } 4116b411b363SPhilipp Reisner 411702918be2SPhilipp Reisner peers_ch = kmalloc(length, GFP_NOIO); 4118b411b363SPhilipp Reisner if (peers_ch == NULL) { 4119b411b363SPhilipp Reisner dev_err(DEV, "kmalloc of peers_ch failed\n"); 4120b10d96cbSJohannes Thoma rv = -1; 4121b411b363SPhilipp Reisner goto fail; 4122b411b363SPhilipp Reisner } 4123b411b363SPhilipp Reisner 412402918be2SPhilipp Reisner rv = drbd_recv(mdev, peers_ch, length); 4125b411b363SPhilipp Reisner 412602918be2SPhilipp Reisner if (rv != length) { 41270ddc5549SLars Ellenberg if (!signal_pending(current)) 41280ddc5549SLars Ellenberg dev_warn(DEV, "short read AuthChallenge: l=%u\n", rv); 4129b411b363SPhilipp Reisner rv = 0; 4130b411b363SPhilipp Reisner goto fail; 4131b411b363SPhilipp Reisner } 4132b411b363SPhilipp Reisner 4133a0638456SPhilipp Reisner resp_size = crypto_hash_digestsize(mdev->tconn->cram_hmac_tfm); 4134b411b363SPhilipp Reisner response = kmalloc(resp_size, GFP_NOIO); 4135b411b363SPhilipp Reisner if (response == NULL) { 4136b411b363SPhilipp Reisner dev_err(DEV, "kmalloc of response failed\n"); 4137b10d96cbSJohannes Thoma rv = -1; 4138b411b363SPhilipp Reisner goto fail; 4139b411b363SPhilipp Reisner } 4140b411b363SPhilipp Reisner 4141b411b363SPhilipp Reisner sg_init_table(&sg, 1); 414202918be2SPhilipp Reisner sg_set_buf(&sg, peers_ch, length); 4143b411b363SPhilipp Reisner 4144b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, response); 4145b411b363SPhilipp Reisner if (rv) { 4146b411b363SPhilipp Reisner dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv); 4147b10d96cbSJohannes Thoma rv = -1; 4148b411b363SPhilipp Reisner goto fail; 4149b411b363SPhilipp Reisner } 4150b411b363SPhilipp Reisner 4151b411b363SPhilipp Reisner rv = drbd_send_cmd2(mdev, P_AUTH_RESPONSE, response, resp_size); 4152b411b363SPhilipp Reisner if (!rv) 4153b411b363SPhilipp Reisner goto fail; 4154b411b363SPhilipp Reisner 415502918be2SPhilipp Reisner rv = drbd_recv_header(mdev, &cmd, &length); 4156b411b363SPhilipp Reisner if (!rv) 4157b411b363SPhilipp Reisner goto fail; 4158b411b363SPhilipp Reisner 415902918be2SPhilipp Reisner if (cmd != P_AUTH_RESPONSE) { 4160b411b363SPhilipp Reisner dev_err(DEV, "expected AuthResponse packet, received: %s (0x%04x)\n", 416102918be2SPhilipp Reisner cmdname(cmd), cmd); 4162b411b363SPhilipp Reisner rv = 0; 4163b411b363SPhilipp Reisner goto fail; 4164b411b363SPhilipp Reisner } 4165b411b363SPhilipp Reisner 416602918be2SPhilipp Reisner if (length != resp_size) { 4167b411b363SPhilipp Reisner dev_err(DEV, "expected AuthResponse payload of wrong size\n"); 4168b411b363SPhilipp Reisner rv = 0; 4169b411b363SPhilipp Reisner goto fail; 4170b411b363SPhilipp Reisner } 4171b411b363SPhilipp Reisner 4172b411b363SPhilipp Reisner rv = drbd_recv(mdev, response , resp_size); 4173b411b363SPhilipp Reisner 4174b411b363SPhilipp Reisner if (rv != resp_size) { 41750ddc5549SLars Ellenberg if (!signal_pending(current)) 41760ddc5549SLars Ellenberg dev_warn(DEV, "short read receiving AuthResponse: l=%u\n", rv); 4177b411b363SPhilipp Reisner rv = 0; 4178b411b363SPhilipp Reisner goto fail; 4179b411b363SPhilipp Reisner } 4180b411b363SPhilipp Reisner 4181b411b363SPhilipp Reisner right_response = kmalloc(resp_size, GFP_NOIO); 41822d1ee87dSJulia Lawall if (right_response == NULL) { 4183b411b363SPhilipp Reisner dev_err(DEV, "kmalloc of right_response failed\n"); 4184b10d96cbSJohannes Thoma rv = -1; 4185b411b363SPhilipp Reisner goto fail; 4186b411b363SPhilipp Reisner } 4187b411b363SPhilipp Reisner 4188b411b363SPhilipp Reisner sg_set_buf(&sg, my_challenge, CHALLENGE_LEN); 4189b411b363SPhilipp Reisner 4190b411b363SPhilipp Reisner rv = crypto_hash_digest(&desc, &sg, sg.length, right_response); 4191b411b363SPhilipp Reisner if (rv) { 4192b411b363SPhilipp Reisner dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv); 4193b10d96cbSJohannes Thoma rv = -1; 4194b411b363SPhilipp Reisner goto fail; 4195b411b363SPhilipp Reisner } 4196b411b363SPhilipp Reisner 4197b411b363SPhilipp Reisner rv = !memcmp(response, right_response, resp_size); 4198b411b363SPhilipp Reisner 4199b411b363SPhilipp Reisner if (rv) 4200b411b363SPhilipp Reisner dev_info(DEV, "Peer authenticated using %d bytes of '%s' HMAC\n", 420189e58e75SPhilipp Reisner resp_size, mdev->tconn->net_conf->cram_hmac_alg); 4202b10d96cbSJohannes Thoma else 4203b10d96cbSJohannes Thoma rv = -1; 4204b411b363SPhilipp Reisner 4205b411b363SPhilipp Reisner fail: 4206b411b363SPhilipp Reisner kfree(peers_ch); 4207b411b363SPhilipp Reisner kfree(response); 4208b411b363SPhilipp Reisner kfree(right_response); 4209b411b363SPhilipp Reisner 4210b411b363SPhilipp Reisner return rv; 4211b411b363SPhilipp Reisner } 4212b411b363SPhilipp Reisner #endif 4213b411b363SPhilipp Reisner 4214b411b363SPhilipp Reisner int drbdd_init(struct drbd_thread *thi) 4215b411b363SPhilipp Reisner { 4216b411b363SPhilipp Reisner struct drbd_conf *mdev = thi->mdev; 4217b411b363SPhilipp Reisner unsigned int minor = mdev_to_minor(mdev); 4218b411b363SPhilipp Reisner int h; 4219b411b363SPhilipp Reisner 4220b411b363SPhilipp Reisner sprintf(current->comm, "drbd%d_receiver", minor); 4221b411b363SPhilipp Reisner 4222b411b363SPhilipp Reisner dev_info(DEV, "receiver (re)started\n"); 4223b411b363SPhilipp Reisner 4224b411b363SPhilipp Reisner do { 4225b411b363SPhilipp Reisner h = drbd_connect(mdev); 4226b411b363SPhilipp Reisner if (h == 0) { 4227b411b363SPhilipp Reisner drbd_disconnect(mdev); 422820ee6390SPhilipp Reisner schedule_timeout_interruptible(HZ); 4229b411b363SPhilipp Reisner } 4230b411b363SPhilipp Reisner if (h == -1) { 4231b411b363SPhilipp Reisner dev_warn(DEV, "Discarding network configuration.\n"); 4232b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 4233b411b363SPhilipp Reisner } 4234b411b363SPhilipp Reisner } while (h == 0); 4235b411b363SPhilipp Reisner 4236b411b363SPhilipp Reisner if (h > 0) { 4237b2fb6dbeSPhilipp Reisner if (get_net_conf(mdev->tconn)) { 4238b411b363SPhilipp Reisner drbdd(mdev); 4239b2fb6dbeSPhilipp Reisner put_net_conf(mdev->tconn); 4240b411b363SPhilipp Reisner } 4241b411b363SPhilipp Reisner } 4242b411b363SPhilipp Reisner 4243b411b363SPhilipp Reisner drbd_disconnect(mdev); 4244b411b363SPhilipp Reisner 4245b411b363SPhilipp Reisner dev_info(DEV, "receiver terminated\n"); 4246b411b363SPhilipp Reisner return 0; 4247b411b363SPhilipp Reisner } 4248b411b363SPhilipp Reisner 4249b411b363SPhilipp Reisner /* ********* acknowledge sender ******** */ 4250b411b363SPhilipp Reisner 4251d8763023SAndreas Gruenbacher static int got_RqSReply(struct drbd_conf *mdev, enum drbd_packet cmd) 4252b411b363SPhilipp Reisner { 4253257d0af6SPhilipp Reisner struct p_req_state_reply *p = &mdev->tconn->meta.rbuf.req_state_reply; 4254b411b363SPhilipp Reisner 4255b411b363SPhilipp Reisner int retcode = be32_to_cpu(p->retcode); 4256b411b363SPhilipp Reisner 4257b411b363SPhilipp Reisner if (retcode >= SS_SUCCESS) { 4258b411b363SPhilipp Reisner set_bit(CL_ST_CHG_SUCCESS, &mdev->flags); 4259b411b363SPhilipp Reisner } else { 4260b411b363SPhilipp Reisner set_bit(CL_ST_CHG_FAIL, &mdev->flags); 4261b411b363SPhilipp Reisner dev_err(DEV, "Requested state change failed by peer: %s (%d)\n", 4262b411b363SPhilipp Reisner drbd_set_st_err_str(retcode), retcode); 4263b411b363SPhilipp Reisner } 4264b411b363SPhilipp Reisner wake_up(&mdev->state_wait); 4265b411b363SPhilipp Reisner 426681e84650SAndreas Gruenbacher return true; 4267b411b363SPhilipp Reisner } 4268b411b363SPhilipp Reisner 4269d8763023SAndreas Gruenbacher static int got_Ping(struct drbd_conf *mdev, enum drbd_packet cmd) 4270b411b363SPhilipp Reisner { 4271b411b363SPhilipp Reisner return drbd_send_ping_ack(mdev); 4272b411b363SPhilipp Reisner 4273b411b363SPhilipp Reisner } 4274b411b363SPhilipp Reisner 4275d8763023SAndreas Gruenbacher static int got_PingAck(struct drbd_conf *mdev, enum drbd_packet cmd) 4276b411b363SPhilipp Reisner { 4277b411b363SPhilipp Reisner /* restore idle timeout */ 4278e42325a5SPhilipp Reisner mdev->tconn->meta.socket->sk->sk_rcvtimeo = mdev->tconn->net_conf->ping_int*HZ; 4279309d1608SPhilipp Reisner if (!test_and_set_bit(GOT_PING_ACK, &mdev->flags)) 4280309d1608SPhilipp Reisner wake_up(&mdev->misc_wait); 4281b411b363SPhilipp Reisner 428281e84650SAndreas Gruenbacher return true; 4283b411b363SPhilipp Reisner } 4284b411b363SPhilipp Reisner 4285d8763023SAndreas Gruenbacher static int got_IsInSync(struct drbd_conf *mdev, enum drbd_packet cmd) 4286b411b363SPhilipp Reisner { 4287257d0af6SPhilipp Reisner struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack; 4288b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4289b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4290b411b363SPhilipp Reisner 429131890f4aSPhilipp Reisner D_ASSERT(mdev->tconn->agreed_pro_version >= 89); 4292b411b363SPhilipp Reisner 4293b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4294b411b363SPhilipp Reisner 42951d53f09eSLars Ellenberg if (get_ldev(mdev)) { 4296b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4297b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4298b411b363SPhilipp Reisner /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ 4299b411b363SPhilipp Reisner mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); 43001d53f09eSLars Ellenberg put_ldev(mdev); 43011d53f09eSLars Ellenberg } 4302b411b363SPhilipp Reisner dec_rs_pending(mdev); 4303778f271dSPhilipp Reisner atomic_add(blksize >> 9, &mdev->rs_sect_in); 4304b411b363SPhilipp Reisner 430581e84650SAndreas Gruenbacher return true; 4306b411b363SPhilipp Reisner } 4307b411b363SPhilipp Reisner 4308bc9c5c41SAndreas Gruenbacher static int 4309bc9c5c41SAndreas Gruenbacher validate_req_change_req_state(struct drbd_conf *mdev, u64 id, sector_t sector, 4310bc9c5c41SAndreas Gruenbacher struct rb_root *root, const char *func, 4311bc9c5c41SAndreas Gruenbacher enum drbd_req_event what, bool missing_ok) 4312b411b363SPhilipp Reisner { 4313b411b363SPhilipp Reisner struct drbd_request *req; 4314b411b363SPhilipp Reisner struct bio_and_error m; 4315b411b363SPhilipp Reisner 431687eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 4317bc9c5c41SAndreas Gruenbacher req = find_request(mdev, root, id, sector, missing_ok, func); 4318b411b363SPhilipp Reisner if (unlikely(!req)) { 431987eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 432081e84650SAndreas Gruenbacher return false; 4321b411b363SPhilipp Reisner } 4322b411b363SPhilipp Reisner __req_mod(req, what, &m); 432387eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 4324b411b363SPhilipp Reisner 4325b411b363SPhilipp Reisner if (m.bio) 4326b411b363SPhilipp Reisner complete_master_bio(mdev, &m); 432781e84650SAndreas Gruenbacher return true; 4328b411b363SPhilipp Reisner } 4329b411b363SPhilipp Reisner 4330d8763023SAndreas Gruenbacher static int got_BlockAck(struct drbd_conf *mdev, enum drbd_packet cmd) 4331b411b363SPhilipp Reisner { 4332257d0af6SPhilipp Reisner struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack; 4333b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4334b411b363SPhilipp Reisner int blksize = be32_to_cpu(p->blksize); 4335b411b363SPhilipp Reisner enum drbd_req_event what; 4336b411b363SPhilipp Reisner 4337b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4338b411b363SPhilipp Reisner 4339579b57edSAndreas Gruenbacher if (p->block_id == ID_SYNCER) { 4340b411b363SPhilipp Reisner drbd_set_in_sync(mdev, sector, blksize); 4341b411b363SPhilipp Reisner dec_rs_pending(mdev); 434281e84650SAndreas Gruenbacher return true; 4343b411b363SPhilipp Reisner } 4344257d0af6SPhilipp Reisner switch (cmd) { 4345b411b363SPhilipp Reisner case P_RS_WRITE_ACK: 434689e58e75SPhilipp Reisner D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C); 43478554df1cSAndreas Gruenbacher what = WRITE_ACKED_BY_PEER_AND_SIS; 4348b411b363SPhilipp Reisner break; 4349b411b363SPhilipp Reisner case P_WRITE_ACK: 435089e58e75SPhilipp Reisner D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C); 43518554df1cSAndreas Gruenbacher what = WRITE_ACKED_BY_PEER; 4352b411b363SPhilipp Reisner break; 4353b411b363SPhilipp Reisner case P_RECV_ACK: 435489e58e75SPhilipp Reisner D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_B); 43558554df1cSAndreas Gruenbacher what = RECV_ACKED_BY_PEER; 4356b411b363SPhilipp Reisner break; 4357b411b363SPhilipp Reisner case P_DISCARD_ACK: 435889e58e75SPhilipp Reisner D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C); 43598554df1cSAndreas Gruenbacher what = CONFLICT_DISCARDED_BY_PEER; 4360b411b363SPhilipp Reisner break; 4361b411b363SPhilipp Reisner default: 4362b411b363SPhilipp Reisner D_ASSERT(0); 436381e84650SAndreas Gruenbacher return false; 4364b411b363SPhilipp Reisner } 4365b411b363SPhilipp Reisner 4366b411b363SPhilipp Reisner return validate_req_change_req_state(mdev, p->block_id, sector, 4367bc9c5c41SAndreas Gruenbacher &mdev->write_requests, __func__, 4368bc9c5c41SAndreas Gruenbacher what, false); 4369b411b363SPhilipp Reisner } 4370b411b363SPhilipp Reisner 4371d8763023SAndreas Gruenbacher static int got_NegAck(struct drbd_conf *mdev, enum drbd_packet cmd) 4372b411b363SPhilipp Reisner { 4373257d0af6SPhilipp Reisner struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack; 4374b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 43752deb8336SPhilipp Reisner int size = be32_to_cpu(p->blksize); 437689e58e75SPhilipp Reisner bool missing_ok = mdev->tconn->net_conf->wire_protocol == DRBD_PROT_A || 437789e58e75SPhilipp Reisner mdev->tconn->net_conf->wire_protocol == DRBD_PROT_B; 4378c3afd8f5SAndreas Gruenbacher bool found; 4379b411b363SPhilipp Reisner 4380b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4381b411b363SPhilipp Reisner 4382579b57edSAndreas Gruenbacher if (p->block_id == ID_SYNCER) { 4383b411b363SPhilipp Reisner dec_rs_pending(mdev); 4384b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 438581e84650SAndreas Gruenbacher return true; 4386b411b363SPhilipp Reisner } 43872deb8336SPhilipp Reisner 4388c3afd8f5SAndreas Gruenbacher found = validate_req_change_req_state(mdev, p->block_id, sector, 4389bc9c5c41SAndreas Gruenbacher &mdev->write_requests, __func__, 43908554df1cSAndreas Gruenbacher NEG_ACKED, missing_ok); 4391c3afd8f5SAndreas Gruenbacher if (!found) { 43922deb8336SPhilipp Reisner /* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs. 43932deb8336SPhilipp Reisner The master bio might already be completed, therefore the 4394c3afd8f5SAndreas Gruenbacher request is no longer in the collision hash. */ 43952deb8336SPhilipp Reisner /* In Protocol B we might already have got a P_RECV_ACK 43962deb8336SPhilipp Reisner but then get a P_NEG_ACK afterwards. */ 4397c3afd8f5SAndreas Gruenbacher if (!missing_ok) 43982deb8336SPhilipp Reisner return false; 4399c3afd8f5SAndreas Gruenbacher drbd_set_out_of_sync(mdev, sector, size); 44002deb8336SPhilipp Reisner } 44012deb8336SPhilipp Reisner return true; 4402b411b363SPhilipp Reisner } 4403b411b363SPhilipp Reisner 4404d8763023SAndreas Gruenbacher static int got_NegDReply(struct drbd_conf *mdev, enum drbd_packet cmd) 4405b411b363SPhilipp Reisner { 4406257d0af6SPhilipp Reisner struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack; 4407b411b363SPhilipp Reisner sector_t sector = be64_to_cpu(p->sector); 4408b411b363SPhilipp Reisner 4409b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4410b411b363SPhilipp Reisner dev_err(DEV, "Got NegDReply; Sector %llus, len %u; Fail original request.\n", 4411b411b363SPhilipp Reisner (unsigned long long)sector, be32_to_cpu(p->blksize)); 4412b411b363SPhilipp Reisner 4413b411b363SPhilipp Reisner return validate_req_change_req_state(mdev, p->block_id, sector, 4414bc9c5c41SAndreas Gruenbacher &mdev->read_requests, __func__, 44158554df1cSAndreas Gruenbacher NEG_ACKED, false); 4416b411b363SPhilipp Reisner } 4417b411b363SPhilipp Reisner 4418d8763023SAndreas Gruenbacher static int got_NegRSDReply(struct drbd_conf *mdev, enum drbd_packet cmd) 4419b411b363SPhilipp Reisner { 4420b411b363SPhilipp Reisner sector_t sector; 4421b411b363SPhilipp Reisner int size; 4422257d0af6SPhilipp Reisner struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack; 4423b411b363SPhilipp Reisner 4424b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4425b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4426b411b363SPhilipp Reisner 4427b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4428b411b363SPhilipp Reisner 4429b411b363SPhilipp Reisner dec_rs_pending(mdev); 4430b411b363SPhilipp Reisner 4431b411b363SPhilipp Reisner if (get_ldev_if_state(mdev, D_FAILED)) { 4432b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4433257d0af6SPhilipp Reisner switch (cmd) { 4434d612d309SPhilipp Reisner case P_NEG_RS_DREPLY: 4435b411b363SPhilipp Reisner drbd_rs_failed_io(mdev, sector, size); 4436d612d309SPhilipp Reisner case P_RS_CANCEL: 4437d612d309SPhilipp Reisner break; 4438d612d309SPhilipp Reisner default: 4439d612d309SPhilipp Reisner D_ASSERT(0); 4440d612d309SPhilipp Reisner put_ldev(mdev); 4441d612d309SPhilipp Reisner return false; 4442d612d309SPhilipp Reisner } 4443b411b363SPhilipp Reisner put_ldev(mdev); 4444b411b363SPhilipp Reisner } 4445b411b363SPhilipp Reisner 444681e84650SAndreas Gruenbacher return true; 4447b411b363SPhilipp Reisner } 4448b411b363SPhilipp Reisner 4449d8763023SAndreas Gruenbacher static int got_BarrierAck(struct drbd_conf *mdev, enum drbd_packet cmd) 4450b411b363SPhilipp Reisner { 4451257d0af6SPhilipp Reisner struct p_barrier_ack *p = &mdev->tconn->meta.rbuf.barrier_ack; 4452b411b363SPhilipp Reisner 4453b411b363SPhilipp Reisner tl_release(mdev, p->barrier, be32_to_cpu(p->set_size)); 4454b411b363SPhilipp Reisner 4455c4752ef1SPhilipp Reisner if (mdev->state.conn == C_AHEAD && 4456c4752ef1SPhilipp Reisner atomic_read(&mdev->ap_in_flight) == 0 && 4457370a43e7SPhilipp Reisner !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &mdev->current_epoch->flags)) { 4458370a43e7SPhilipp Reisner mdev->start_resync_timer.expires = jiffies + HZ; 4459370a43e7SPhilipp Reisner add_timer(&mdev->start_resync_timer); 4460c4752ef1SPhilipp Reisner } 4461c4752ef1SPhilipp Reisner 446281e84650SAndreas Gruenbacher return true; 4463b411b363SPhilipp Reisner } 4464b411b363SPhilipp Reisner 4465d8763023SAndreas Gruenbacher static int got_OVResult(struct drbd_conf *mdev, enum drbd_packet cmd) 4466b411b363SPhilipp Reisner { 4467257d0af6SPhilipp Reisner struct p_block_ack *p = &mdev->tconn->meta.rbuf.block_ack; 4468b411b363SPhilipp Reisner struct drbd_work *w; 4469b411b363SPhilipp Reisner sector_t sector; 4470b411b363SPhilipp Reisner int size; 4471b411b363SPhilipp Reisner 4472b411b363SPhilipp Reisner sector = be64_to_cpu(p->sector); 4473b411b363SPhilipp Reisner size = be32_to_cpu(p->blksize); 4474b411b363SPhilipp Reisner 4475b411b363SPhilipp Reisner update_peer_seq(mdev, be32_to_cpu(p->seq_num)); 4476b411b363SPhilipp Reisner 4477b411b363SPhilipp Reisner if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) 4478b411b363SPhilipp Reisner drbd_ov_oos_found(mdev, sector, size); 4479b411b363SPhilipp Reisner else 4480b411b363SPhilipp Reisner ov_oos_print(mdev); 4481b411b363SPhilipp Reisner 44821d53f09eSLars Ellenberg if (!get_ldev(mdev)) 448381e84650SAndreas Gruenbacher return true; 44841d53f09eSLars Ellenberg 4485b411b363SPhilipp Reisner drbd_rs_complete_io(mdev, sector); 4486b411b363SPhilipp Reisner dec_rs_pending(mdev); 4487b411b363SPhilipp Reisner 4488ea5442afSLars Ellenberg --mdev->ov_left; 4489ea5442afSLars Ellenberg 4490ea5442afSLars Ellenberg /* let's advance progress step marks only for every other megabyte */ 4491ea5442afSLars Ellenberg if ((mdev->ov_left & 0x200) == 0x200) 4492ea5442afSLars Ellenberg drbd_advance_rs_marks(mdev, mdev->ov_left); 4493ea5442afSLars Ellenberg 4494ea5442afSLars Ellenberg if (mdev->ov_left == 0) { 4495b411b363SPhilipp Reisner w = kmalloc(sizeof(*w), GFP_NOIO); 4496b411b363SPhilipp Reisner if (w) { 4497b411b363SPhilipp Reisner w->cb = w_ov_finished; 4498e42325a5SPhilipp Reisner drbd_queue_work_front(&mdev->tconn->data.work, w); 4499b411b363SPhilipp Reisner } else { 4500b411b363SPhilipp Reisner dev_err(DEV, "kmalloc(w) failed."); 4501b411b363SPhilipp Reisner ov_oos_print(mdev); 4502b411b363SPhilipp Reisner drbd_resync_finished(mdev); 4503b411b363SPhilipp Reisner } 4504b411b363SPhilipp Reisner } 45051d53f09eSLars Ellenberg put_ldev(mdev); 450681e84650SAndreas Gruenbacher return true; 4507b411b363SPhilipp Reisner } 4508b411b363SPhilipp Reisner 4509d8763023SAndreas Gruenbacher static int got_skip(struct drbd_conf *mdev, enum drbd_packet cmd) 45100ced55a3SPhilipp Reisner { 451181e84650SAndreas Gruenbacher return true; 45120ced55a3SPhilipp Reisner } 45130ced55a3SPhilipp Reisner 4514b411b363SPhilipp Reisner struct asender_cmd { 4515b411b363SPhilipp Reisner size_t pkt_size; 4516d8763023SAndreas Gruenbacher int (*process)(struct drbd_conf *mdev, enum drbd_packet cmd); 4517b411b363SPhilipp Reisner }; 4518b411b363SPhilipp Reisner 4519b411b363SPhilipp Reisner static struct asender_cmd *get_asender_cmd(int cmd) 4520b411b363SPhilipp Reisner { 4521b411b363SPhilipp Reisner static struct asender_cmd asender_tbl[] = { 4522b411b363SPhilipp Reisner /* anything missing from this table is in 4523b411b363SPhilipp Reisner * the drbd_cmd_handler (drbd_default_handler) table, 4524b411b363SPhilipp Reisner * see the beginning of drbdd() */ 4525257d0af6SPhilipp Reisner [P_PING] = { sizeof(struct p_header), got_Ping }, 4526257d0af6SPhilipp Reisner [P_PING_ACK] = { sizeof(struct p_header), got_PingAck }, 4527b411b363SPhilipp Reisner [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4528b411b363SPhilipp Reisner [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4529b411b363SPhilipp Reisner [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4530b411b363SPhilipp Reisner [P_DISCARD_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, 4531b411b363SPhilipp Reisner [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, 4532b411b363SPhilipp Reisner [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, 4533b411b363SPhilipp Reisner [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply}, 4534b411b363SPhilipp Reisner [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, 4535b411b363SPhilipp Reisner [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, 4536b411b363SPhilipp Reisner [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, 4537b411b363SPhilipp Reisner [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, 453802918be2SPhilipp Reisner [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip }, 4539d612d309SPhilipp Reisner [P_RS_CANCEL] = { sizeof(struct p_block_ack), got_NegRSDReply}, 4540b411b363SPhilipp Reisner [P_MAX_CMD] = { 0, NULL }, 4541b411b363SPhilipp Reisner }; 4542b411b363SPhilipp Reisner if (cmd > P_MAX_CMD || asender_tbl[cmd].process == NULL) 4543b411b363SPhilipp Reisner return NULL; 4544b411b363SPhilipp Reisner return &asender_tbl[cmd]; 4545b411b363SPhilipp Reisner } 4546b411b363SPhilipp Reisner 4547b411b363SPhilipp Reisner int drbd_asender(struct drbd_thread *thi) 4548b411b363SPhilipp Reisner { 4549b411b363SPhilipp Reisner struct drbd_conf *mdev = thi->mdev; 4550257d0af6SPhilipp Reisner struct p_header *h = &mdev->tconn->meta.rbuf.header; 4551b411b363SPhilipp Reisner struct asender_cmd *cmd = NULL; 4552b411b363SPhilipp Reisner 4553257d0af6SPhilipp Reisner int rv; 4554b411b363SPhilipp Reisner void *buf = h; 4555b411b363SPhilipp Reisner int received = 0; 4556257d0af6SPhilipp Reisner int expect = sizeof(struct p_header); 4557f36af18cSLars Ellenberg int ping_timeout_active = 0; 4558257d0af6SPhilipp Reisner int empty, pkt_size; 4559d8763023SAndreas Gruenbacher enum drbd_packet cmd_nr; 4560b411b363SPhilipp Reisner 4561b411b363SPhilipp Reisner sprintf(current->comm, "drbd%d_asender", mdev_to_minor(mdev)); 4562b411b363SPhilipp Reisner 4563b411b363SPhilipp Reisner current->policy = SCHED_RR; /* Make this a realtime task! */ 4564b411b363SPhilipp Reisner current->rt_priority = 2; /* more important than all other tasks */ 4565b411b363SPhilipp Reisner 4566e77a0a5cSAndreas Gruenbacher while (get_t_state(thi) == RUNNING) { 4567b411b363SPhilipp Reisner drbd_thread_current_set_cpu(mdev); 4568b411b363SPhilipp Reisner if (test_and_clear_bit(SEND_PING, &mdev->flags)) { 4569841ce241SAndreas Gruenbacher if (!drbd_send_ping(mdev)) { 4570841ce241SAndreas Gruenbacher dev_err(DEV, "drbd_send_ping has failed\n"); 4571841ce241SAndreas Gruenbacher goto reconnect; 4572841ce241SAndreas Gruenbacher } 4573e42325a5SPhilipp Reisner mdev->tconn->meta.socket->sk->sk_rcvtimeo = 457489e58e75SPhilipp Reisner mdev->tconn->net_conf->ping_timeo*HZ/10; 4575f36af18cSLars Ellenberg ping_timeout_active = 1; 4576b411b363SPhilipp Reisner } 4577b411b363SPhilipp Reisner 4578b411b363SPhilipp Reisner /* conditionally cork; 4579b411b363SPhilipp Reisner * it may hurt latency if we cork without much to send */ 458089e58e75SPhilipp Reisner if (!mdev->tconn->net_conf->no_cork && 4581b411b363SPhilipp Reisner 3 < atomic_read(&mdev->unacked_cnt)) 4582e42325a5SPhilipp Reisner drbd_tcp_cork(mdev->tconn->meta.socket); 4583b411b363SPhilipp Reisner while (1) { 4584b411b363SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &mdev->flags); 4585b411b363SPhilipp Reisner flush_signals(current); 45860f8488e1SLars Ellenberg if (!drbd_process_done_ee(mdev)) 4587b411b363SPhilipp Reisner goto reconnect; 4588b411b363SPhilipp Reisner /* to avoid race with newly queued ACKs */ 4589b411b363SPhilipp Reisner set_bit(SIGNAL_ASENDER, &mdev->flags); 459087eeee41SPhilipp Reisner spin_lock_irq(&mdev->tconn->req_lock); 4591b411b363SPhilipp Reisner empty = list_empty(&mdev->done_ee); 459287eeee41SPhilipp Reisner spin_unlock_irq(&mdev->tconn->req_lock); 4593b411b363SPhilipp Reisner /* new ack may have been queued right here, 4594b411b363SPhilipp Reisner * but then there is also a signal pending, 4595b411b363SPhilipp Reisner * and we start over... */ 4596b411b363SPhilipp Reisner if (empty) 4597b411b363SPhilipp Reisner break; 4598b411b363SPhilipp Reisner } 4599b411b363SPhilipp Reisner /* but unconditionally uncork unless disabled */ 460089e58e75SPhilipp Reisner if (!mdev->tconn->net_conf->no_cork) 4601e42325a5SPhilipp Reisner drbd_tcp_uncork(mdev->tconn->meta.socket); 4602b411b363SPhilipp Reisner 4603b411b363SPhilipp Reisner /* short circuit, recv_msg would return EINTR anyways. */ 4604b411b363SPhilipp Reisner if (signal_pending(current)) 4605b411b363SPhilipp Reisner continue; 4606b411b363SPhilipp Reisner 4607e42325a5SPhilipp Reisner rv = drbd_recv_short(mdev, mdev->tconn->meta.socket, 4608b411b363SPhilipp Reisner buf, expect-received, 0); 4609b411b363SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &mdev->flags); 4610b411b363SPhilipp Reisner 4611b411b363SPhilipp Reisner flush_signals(current); 4612b411b363SPhilipp Reisner 4613b411b363SPhilipp Reisner /* Note: 4614b411b363SPhilipp Reisner * -EINTR (on meta) we got a signal 4615b411b363SPhilipp Reisner * -EAGAIN (on meta) rcvtimeo expired 4616b411b363SPhilipp Reisner * -ECONNRESET other side closed the connection 4617b411b363SPhilipp Reisner * -ERESTARTSYS (on data) we got a signal 4618b411b363SPhilipp Reisner * rv < 0 other than above: unexpected error! 4619b411b363SPhilipp Reisner * rv == expected: full header or command 4620b411b363SPhilipp Reisner * rv < expected: "woken" by signal during receive 4621b411b363SPhilipp Reisner * rv == 0 : "connection shut down by peer" 4622b411b363SPhilipp Reisner */ 4623b411b363SPhilipp Reisner if (likely(rv > 0)) { 4624b411b363SPhilipp Reisner received += rv; 4625b411b363SPhilipp Reisner buf += rv; 4626b411b363SPhilipp Reisner } else if (rv == 0) { 4627b411b363SPhilipp Reisner dev_err(DEV, "meta connection shut down by peer.\n"); 4628b411b363SPhilipp Reisner goto reconnect; 4629b411b363SPhilipp Reisner } else if (rv == -EAGAIN) { 4630cb6518cbSLars Ellenberg /* If the data socket received something meanwhile, 4631cb6518cbSLars Ellenberg * that is good enough: peer is still alive. */ 463231890f4aSPhilipp Reisner if (time_after(mdev->tconn->last_received, 4633e42325a5SPhilipp Reisner jiffies - mdev->tconn->meta.socket->sk->sk_rcvtimeo)) 4634cb6518cbSLars Ellenberg continue; 4635f36af18cSLars Ellenberg if (ping_timeout_active) { 4636b411b363SPhilipp Reisner dev_err(DEV, "PingAck did not arrive in time.\n"); 4637b411b363SPhilipp Reisner goto reconnect; 4638b411b363SPhilipp Reisner } 4639b411b363SPhilipp Reisner set_bit(SEND_PING, &mdev->flags); 4640b411b363SPhilipp Reisner continue; 4641b411b363SPhilipp Reisner } else if (rv == -EINTR) { 4642b411b363SPhilipp Reisner continue; 4643b411b363SPhilipp Reisner } else { 4644b411b363SPhilipp Reisner dev_err(DEV, "sock_recvmsg returned %d\n", rv); 4645b411b363SPhilipp Reisner goto reconnect; 4646b411b363SPhilipp Reisner } 4647b411b363SPhilipp Reisner 4648b411b363SPhilipp Reisner if (received == expect && cmd == NULL) { 4649257d0af6SPhilipp Reisner if (!decode_header(mdev, h, &cmd_nr, &pkt_size)) 4650b411b363SPhilipp Reisner goto reconnect; 4651257d0af6SPhilipp Reisner cmd = get_asender_cmd(cmd_nr); 4652b411b363SPhilipp Reisner if (unlikely(cmd == NULL)) { 4653257d0af6SPhilipp Reisner dev_err(DEV, "unknown command %d on meta (l: %d)\n", 4654257d0af6SPhilipp Reisner cmd_nr, pkt_size); 4655b411b363SPhilipp Reisner goto disconnect; 4656b411b363SPhilipp Reisner } 4657b411b363SPhilipp Reisner expect = cmd->pkt_size; 4658257d0af6SPhilipp Reisner if (pkt_size != expect - sizeof(struct p_header)) { 4659257d0af6SPhilipp Reisner dev_err(DEV, "Wrong packet size on meta (c: %d, l: %d)\n", 4660257d0af6SPhilipp Reisner cmd_nr, pkt_size); 4661b411b363SPhilipp Reisner goto reconnect; 4662b411b363SPhilipp Reisner } 4663257d0af6SPhilipp Reisner } 4664b411b363SPhilipp Reisner if (received == expect) { 466531890f4aSPhilipp Reisner mdev->tconn->last_received = jiffies; 4666b411b363SPhilipp Reisner D_ASSERT(cmd != NULL); 4667257d0af6SPhilipp Reisner if (!cmd->process(mdev, cmd_nr)) 4668b411b363SPhilipp Reisner goto reconnect; 4669b411b363SPhilipp Reisner 4670f36af18cSLars Ellenberg /* the idle_timeout (ping-int) 4671f36af18cSLars Ellenberg * has been restored in got_PingAck() */ 4672f36af18cSLars Ellenberg if (cmd == get_asender_cmd(P_PING_ACK)) 4673f36af18cSLars Ellenberg ping_timeout_active = 0; 4674f36af18cSLars Ellenberg 4675b411b363SPhilipp Reisner buf = h; 4676b411b363SPhilipp Reisner received = 0; 4677257d0af6SPhilipp Reisner expect = sizeof(struct p_header); 4678b411b363SPhilipp Reisner cmd = NULL; 4679b411b363SPhilipp Reisner } 4680b411b363SPhilipp Reisner } 4681b411b363SPhilipp Reisner 4682b411b363SPhilipp Reisner if (0) { 4683b411b363SPhilipp Reisner reconnect: 4684b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE)); 4685856c50c7SLars Ellenberg drbd_md_sync(mdev); 4686b411b363SPhilipp Reisner } 4687b411b363SPhilipp Reisner if (0) { 4688b411b363SPhilipp Reisner disconnect: 4689b411b363SPhilipp Reisner drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); 4690856c50c7SLars Ellenberg drbd_md_sync(mdev); 4691b411b363SPhilipp Reisner } 4692b411b363SPhilipp Reisner clear_bit(SIGNAL_ASENDER, &mdev->flags); 4693b411b363SPhilipp Reisner 4694b411b363SPhilipp Reisner D_ASSERT(mdev->state.conn < C_CONNECTED); 4695b411b363SPhilipp Reisner dev_info(DEV, "asender terminated\n"); 4696b411b363SPhilipp Reisner 4697b411b363SPhilipp Reisner return 0; 4698b411b363SPhilipp Reisner } 4699