blob: d34d093278c7bc2f495c047e2f5c63747f844e15 [file] [log] [blame]
Philipp Reisnerb411b362009-09-25 16:07:19 -07001/*
2 drbd_receiver.c
3
4 This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
5
6 Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
7 Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
8 Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
9
10 drbd is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2, or (at your option)
13 any later version.
14
15 drbd is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with drbd; see the file COPYING. If not, write to
22 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
23 */
24
25
Philipp Reisnerb411b362009-09-25 16:07:19 -070026#include <linux/module.h>
27
28#include <asm/uaccess.h>
29#include <net/sock.h>
30
Philipp Reisnerb411b362009-09-25 16:07:19 -070031#include <linux/drbd.h>
32#include <linux/fs.h>
33#include <linux/file.h>
34#include <linux/in.h>
35#include <linux/mm.h>
36#include <linux/memcontrol.h>
37#include <linux/mm_inline.h>
38#include <linux/slab.h>
Philipp Reisnerb411b362009-09-25 16:07:19 -070039#include <linux/pkt_sched.h>
40#define __KERNEL_SYSCALLS__
41#include <linux/unistd.h>
42#include <linux/vmalloc.h>
43#include <linux/random.h>
Philipp Reisnerb411b362009-09-25 16:07:19 -070044#include <linux/string.h>
45#include <linux/scatterlist.h>
46#include "drbd_int.h"
Philipp Reisnerb411b362009-09-25 16:07:19 -070047#include "drbd_req.h"
48
49#include "drbd_vli.h"
50
Philipp Reisnerb411b362009-09-25 16:07:19 -070051enum finish_epoch {
52 FE_STILL_LIVE,
53 FE_DESTROYED,
54 FE_RECYCLED,
55};
56
57static int drbd_do_handshake(struct drbd_conf *mdev);
58static int drbd_do_auth(struct drbd_conf *mdev);
59
60static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *, struct drbd_epoch *, enum epoch_event);
61static int e_end_block(struct drbd_conf *, struct drbd_work *, int);
62
Philipp Reisnerb411b362009-09-25 16:07:19 -070063
64#define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN)
65
Lars Ellenberg45bb9122010-05-14 17:10:48 +020066/*
67 * some helper functions to deal with single linked page lists,
68 * page->private being our "next" pointer.
69 */
70
71/* If at least n pages are linked at head, get n pages off.
72 * Otherwise, don't modify head, and return NULL.
73 * Locking is the responsibility of the caller.
74 */
75static struct page *page_chain_del(struct page **head, int n)
76{
77 struct page *page;
78 struct page *tmp;
79
80 BUG_ON(!n);
81 BUG_ON(!head);
82
83 page = *head;
Philipp Reisner23ce4222010-05-20 13:35:31 +020084
85 if (!page)
86 return NULL;
87
Lars Ellenberg45bb9122010-05-14 17:10:48 +020088 while (page) {
89 tmp = page_chain_next(page);
90 if (--n == 0)
91 break; /* found sufficient pages */
92 if (tmp == NULL)
93 /* insufficient pages, don't use any of them. */
94 return NULL;
95 page = tmp;
96 }
97
98 /* add end of list marker for the returned list */
99 set_page_private(page, 0);
100 /* actual return value, and adjustment of head */
101 page = *head;
102 *head = tmp;
103 return page;
104}
105
106/* may be used outside of locks to find the tail of a (usually short)
107 * "private" page chain, before adding it back to a global chain head
108 * with page_chain_add() under a spinlock. */
109static struct page *page_chain_tail(struct page *page, int *len)
110{
111 struct page *tmp;
112 int i = 1;
113 while ((tmp = page_chain_next(page)))
114 ++i, page = tmp;
115 if (len)
116 *len = i;
117 return page;
118}
119
120static int page_chain_free(struct page *page)
121{
122 struct page *tmp;
123 int i = 0;
124 page_chain_for_each_safe(page, tmp) {
125 put_page(page);
126 ++i;
127 }
128 return i;
129}
130
131static void page_chain_add(struct page **head,
132 struct page *chain_first, struct page *chain_last)
133{
134#if 1
135 struct page *tmp;
136 tmp = page_chain_tail(chain_first, NULL);
137 BUG_ON(tmp != chain_last);
138#endif
139
140 /* add chain to head */
141 set_page_private(chain_last, (unsigned long)*head);
142 *head = chain_first;
143}
144
145static struct page *drbd_pp_first_pages_or_try_alloc(struct drbd_conf *mdev, int number)
Philipp Reisnerb411b362009-09-25 16:07:19 -0700146{
147 struct page *page = NULL;
Lars Ellenberg45bb9122010-05-14 17:10:48 +0200148 struct page *tmp = NULL;
149 int i = 0;
Philipp Reisnerb411b362009-09-25 16:07:19 -0700150
151 /* Yes, testing drbd_pp_vacant outside the lock is racy.
152 * So what. It saves a spin_lock. */
Lars Ellenberg45bb9122010-05-14 17:10:48 +0200153 if (drbd_pp_vacant >= number) {
Philipp Reisnerb411b362009-09-25 16:07:19 -0700154 spin_lock(&drbd_pp_lock);
Lars Ellenberg45bb9122010-05-14 17:10:48 +0200155 page = page_chain_del(&drbd_pp_pool, number);
156 if (page)
157 drbd_pp_vacant -= number;
Philipp Reisnerb411b362009-09-25 16:07:19 -0700158 spin_unlock(&drbd_pp_lock);
Lars Ellenberg45bb9122010-05-14 17:10:48 +0200159 if (page)
160 return page;
Philipp Reisnerb411b362009-09-25 16:07:19 -0700161 }
Lars Ellenberg45bb9122010-05-14 17:10:48 +0200162
Philipp Reisnerb411b362009-09-25 16:07:19 -0700163 /* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD
164 * "criss-cross" setup, that might cause write-out on some other DRBD,
165 * which in turn might block on the other node at this very place. */
Lars Ellenberg45bb9122010-05-14 17:10:48 +0200166 for (i = 0; i < number; i++) {
167 tmp = alloc_page(GFP_TRY);
168 if (!tmp)
169 break;
170 set_page_private(tmp, (unsigned long)page);
171 page = tmp;
172 }
173
174 if (i == number)
175 return page;
176
177 /* Not enough pages immediately available this time.
178 * No need to jump around here, drbd_pp_alloc will retry this
179 * function "soon". */
180 if (page) {
181 tmp = page_chain_tail(page, NULL);
182 spin_lock(&drbd_pp_lock);
183 page_chain_add(&drbd_pp_pool, page, tmp);
184 drbd_pp_vacant += i;
185 spin_unlock(&drbd_pp_lock);
186 }
187 return NULL;
Philipp Reisnerb411b362009-09-25 16:07:19 -0700188}
189
Philipp Reisnerb411b362009-09-25 16:07:19 -0700190static void reclaim_net_ee(struct drbd_conf *mdev, struct list_head *to_be_freed)
191{
192 struct drbd_epoch_entry *e;
193 struct list_head *le, *tle;
194
195 /* The EEs are always appended to the end of the list. Since
196 they are sent in order over the wire, they have to finish
197 in order. As soon as we see the first not finished we can
198 stop to examine the list... */
199
200 list_for_each_safe(le, tle, &mdev->net_ee) {
201 e = list_entry(le, struct drbd_epoch_entry, w.list);
Lars Ellenberg45bb9122010-05-14 17:10:48 +0200202 if (drbd_ee_has_active_page(e))
Philipp Reisnerb411b362009-09-25 16:07:19 -0700203 break;
204 list_move(le, to_be_freed);
205 }
206}
207
208static void drbd_kick_lo_and_reclaim_net(struct drbd_conf *mdev)
209{
210 LIST_HEAD(reclaimed);
211 struct drbd_epoch_entry *e, *t;
212
Philipp Reisnerb411b362009-09-25 16:07:19 -0700213 spin_lock_irq(&mdev->req_lock);
214 reclaim_net_ee(mdev, &reclaimed);
215 spin_unlock_irq(&mdev->req_lock);
216
217 list_for_each_entry_safe(e, t, &reclaimed, w.list)
Lars Ellenberg435f0742010-09-06 12:30:25 +0200218 drbd_free_net_ee(mdev, e);
Philipp Reisnerb411b362009-09-25 16:07:19 -0700219}
220
221/**
Lars Ellenberg45bb9122010-05-14 17:10:48 +0200222 * drbd_pp_alloc() - Returns @number pages, retries forever (or until signalled)
Philipp Reisnerb411b362009-09-25 16:07:19 -0700223 * @mdev: DRBD device.
Lars Ellenberg45bb9122010-05-14 17:10:48 +0200224 * @number: number of pages requested
225 * @retry: whether to retry, if not enough pages are available right now
Philipp Reisnerb411b362009-09-25 16:07:19 -0700226 *
Lars Ellenberg45bb9122010-05-14 17:10:48 +0200227 * Tries to allocate number pages, first from our own page pool, then from
228 * the kernel, unless this allocation would exceed the max_buffers setting.
229 * Possibly retry until DRBD frees sufficient pages somewhere else.
230 *
231 * Returns a page chain linked via page->private.
Philipp Reisnerb411b362009-09-25 16:07:19 -0700232 */
Lars Ellenberg45bb9122010-05-14 17:10:48 +0200233static struct page *drbd_pp_alloc(struct drbd_conf *mdev, unsigned number, bool retry)
Philipp Reisnerb411b362009-09-25 16:07:19 -0700234{
235 struct page *page = NULL;
236 DEFINE_WAIT(wait);
237
Lars Ellenberg45bb9122010-05-14 17:10:48 +0200238 /* Yes, we may run up to @number over max_buffers. If we
239 * follow it strictly, the admin will get it wrong anyways. */
240 if (atomic_read(&mdev->pp_in_use) < mdev->net_conf->max_buffers)
241 page = drbd_pp_first_pages_or_try_alloc(mdev, number);
Philipp Reisnerb411b362009-09-25 16:07:19 -0700242
Lars Ellenberg45bb9122010-05-14 17:10:48 +0200243 while (page == NULL) {
Philipp Reisnerb411b362009-09-25 16:07:19 -0700244 prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE);
245
246 drbd_kick_lo_and_reclaim_net(mdev);
247
248 if (atomic_read(&mdev->pp_in_use) < mdev->net_conf->max_buffers) {
Lars Ellenberg45bb9122010-05-14 17:10:48 +0200249 page = drbd_pp_first_pages_or_try_alloc(mdev, number);
Philipp Reisnerb411b362009-09-25 16:07:19 -0700250 if (page)
251 break;
252 }
253
254 if (!retry)
255 break;
256
257 if (signal_pending(current)) {
258 dev_warn(DEV, "drbd_pp_alloc interrupted!\n");
259 break;
260 }
261
262 schedule();
263 }
264 finish_wait(&drbd_pp_wait, &wait);
265
Lars Ellenberg45bb9122010-05-14 17:10:48 +0200266 if (page)
267 atomic_add(number, &mdev->pp_in_use);
Philipp Reisnerb411b362009-09-25 16:07:19 -0700268 return page;
269}
270
271/* Must not be used from irq, as that may deadlock: see drbd_pp_alloc.
Lars Ellenberg45bb9122010-05-14 17:10:48 +0200272 * Is also used from inside an other spin_lock_irq(&mdev->req_lock);
273 * Either links the page chain back to the global pool,
274 * or returns all pages to the system. */
Lars Ellenberg435f0742010-09-06 12:30:25 +0200275static void drbd_pp_free(struct drbd_conf *mdev, struct page *page, int is_net)
Philipp Reisnerb411b362009-09-25 16:07:19 -0700276{
Lars Ellenberg435f0742010-09-06 12:30:25 +0200277 atomic_t *a = is_net ? &mdev->pp_in_use_by_net : &mdev->pp_in_use;
Philipp Reisnerb411b362009-09-25 16:07:19 -0700278 int i;
Lars Ellenberg435f0742010-09-06 12:30:25 +0200279
Lars Ellenberg1816a2b2010-11-11 15:19:07 +0100280 if (drbd_pp_vacant > (DRBD_MAX_BIO_SIZE/PAGE_SIZE)*minor_count)
Lars Ellenberg45bb9122010-05-14 17:10:48 +0200281 i = page_chain_free(page);
282 else {
283 struct page *tmp;
284 tmp = page_chain_tail(page, &i);
285 spin_lock(&drbd_pp_lock);
286 page_chain_add(&drbd_pp_pool, page, tmp);
287 drbd_pp_vacant += i;
288 spin_unlock(&drbd_pp_lock);
Philipp Reisnerb411b362009-09-25 16:07:19 -0700289 }
Lars Ellenberg435f0742010-09-06 12:30:25 +0200290 i = atomic_sub_return(i, a);
Lars Ellenberg45bb9122010-05-14 17:10:48 +0200291 if (i < 0)
Lars Ellenberg435f0742010-09-06 12:30:25 +0200292 dev_warn(DEV, "ASSERTION FAILED: %s: %d < 0\n",
293 is_net ? "pp_in_use_by_net" : "pp_in_use", i);
Philipp Reisnerb411b362009-09-25 16:07:19 -0700294 wake_up(&drbd_pp_wait);
295}
296
297/*
298You need to hold the req_lock:
299 _drbd_wait_ee_list_empty()
300
301You must not have the req_lock:
302 drbd_free_ee()
303 drbd_alloc_ee()
304 drbd_init_ee()
305 drbd_release_ee()
306 drbd_ee_fix_bhs()
307 drbd_process_done_ee()
308 drbd_clear_done_ee()
309 drbd_wait_ee_list_empty()
310*/
311
312struct drbd_epoch_entry *drbd_alloc_ee(struct drbd_conf *mdev,
313 u64 id,
314 sector_t sector,
315 unsigned int data_size,
316 gfp_t gfp_mask) __must_hold(local)
317{
Philipp Reisnerb411b362009-09-25 16:07:19 -0700318 struct drbd_epoch_entry *e;
319 struct page *page;
Lars Ellenberg45bb9122010-05-14 17:10:48 +0200320 unsigned nr_pages = (data_size + PAGE_SIZE -1) >> PAGE_SHIFT;
Philipp Reisnerb411b362009-09-25 16:07:19 -0700321
Andreas Gruenbacher0cf9d272010-12-07 10:43:29 +0100322 if (drbd_insert_fault(mdev, DRBD_FAULT_AL_EE))
Philipp Reisnerb411b362009-09-25 16:07:19 -0700323 return NULL;
324
325 e = mempool_alloc(drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM);
326 if (!e) {
327 if (!(gfp_mask & __GFP_NOWARN))
328 dev_err(DEV, "alloc_ee: Allocation of an EE failed\n");
329 return NULL;
330 }
331
Lars Ellenberg45bb9122010-05-14 17:10:48 +0200332 page = drbd_pp_alloc(mdev, nr_pages, (gfp_mask & __GFP_WAIT));
333 if (!page)
334 goto fail;
Philipp Reisnerb411b362009-09-25 16:07:19 -0700335
Philipp Reisnerb411b362009-09-25 16:07:19 -0700336 INIT_HLIST_NODE(&e->colision);
337 e->epoch = NULL;
Lars Ellenberg45bb9122010-05-14 17:10:48 +0200338 e->mdev = mdev;
339 e->pages = page;
340 atomic_set(&e->pending_bios, 0);
341 e->size = data_size;
Philipp Reisnerb411b362009-09-25 16:07:19 -0700342 e->flags = 0;
Lars Ellenberg45bb9122010-05-14 17:10:48 +0200343 e->sector = sector;
Lars Ellenberg45bb9122010-05-14 17:10:48 +0200344 e->block_id = id;
Philipp Reisnerb411b362009-09-25 16:07:19 -0700345
Philipp Reisnerb411b362009-09-25 16:07:19 -0700346 return e;
347
Lars Ellenberg45bb9122010-05-14 17:10:48 +0200348 fail:
Philipp Reisnerb411b362009-09-25 16:07:19 -0700349 mempool_free(e, drbd_ee_mempool);
Philipp Reisnerb411b362009-09-25 16:07:19 -0700350 return NULL;
351}
352
Lars Ellenberg435f0742010-09-06 12:30:25 +0200353void drbd_free_some_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e, int is_net)
Philipp Reisnerb411b362009-09-25 16:07:19 -0700354{
Lars Ellenbergc36c3ce2010-08-11 20:42:55 +0200355 if (e->flags & EE_HAS_DIGEST)
356 kfree(e->digest);
Lars Ellenberg435f0742010-09-06 12:30:25 +0200357 drbd_pp_free(mdev, e->pages, is_net);
Lars Ellenberg45bb9122010-05-14 17:10:48 +0200358 D_ASSERT(atomic_read(&e->pending_bios) == 0);
Philipp Reisnerb411b362009-09-25 16:07:19 -0700359 D_ASSERT(hlist_unhashed(&e->colision));
360 mempool_free(e, drbd_ee_mempool);
361}
362
363int drbd_release_ee(struct drbd_conf *mdev, struct list_head *list)
364{
365 LIST_HEAD(work_list);
366 struct drbd_epoch_entry *e, *t;
367 int count = 0;
Lars Ellenberg435f0742010-09-06 12:30:25 +0200368 int is_net = list == &mdev->net_ee;
Philipp Reisnerb411b362009-09-25 16:07:19 -0700369
370 spin_lock_irq(&mdev->req_lock);
371 list_splice_init(list, &work_list);
372 spin_unlock_irq(&mdev->req_lock);
373
374 list_for_each_entry_safe(e, t, &work_list, w.list) {
Lars Ellenberg435f0742010-09-06 12:30:25 +0200375 drbd_free_some_ee(mdev, e, is_net);
Philipp Reisnerb411b362009-09-25 16:07:19 -0700376 count++;
377 }
378 return count;
379}
380
381
382/*
383 * This function is called from _asender only_
384 * but see also comments in _req_mod(,barrier_acked)
385 * and receive_Barrier.
386 *
387 * Move entries from net_ee to done_ee, if ready.
388 * Grab done_ee, call all callbacks, free the entries.
389 * The callbacks typically send out ACKs.
390 */
391static int drbd_process_done_ee(struct drbd_conf *mdev)
392{
393 LIST_HEAD(work_list);
394 LIST_HEAD(reclaimed);
395 struct drbd_epoch_entry *e, *t;
396 int ok = (mdev->state.conn >= C_WF_REPORT_PARAMS);
397
398 spin_lock_irq(&mdev->req_lock);
399 reclaim_net_ee(mdev, &reclaimed);
400 list_splice_init(&mdev->done_ee, &work_list);
401 spin_unlock_irq(&mdev->req_lock);
402
403 list_for_each_entry_safe(e, t, &reclaimed, w.list)
Lars Ellenberg435f0742010-09-06 12:30:25 +0200404 drbd_free_net_ee(mdev, e);
Philipp Reisnerb411b362009-09-25 16:07:19 -0700405
406 /* possible callbacks here:
407 * e_end_block, and e_end_resync_block, e_send_discard_ack.
408 * all ignore the last argument.
409 */
410 list_for_each_entry_safe(e, t, &work_list, w.list) {
Philipp Reisnerb411b362009-09-25 16:07:19 -0700411 /* list_del not necessary, next/prev members not touched */
412 ok = e->w.cb(mdev, &e->w, !ok) && ok;
413 drbd_free_ee(mdev, e);
414 }
415 wake_up(&mdev->ee_wait);
416
417 return ok;
418}
419
420void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head)
421{
422 DEFINE_WAIT(wait);
423
424 /* avoids spin_lock/unlock
425 * and calling prepare_to_wait in the fast path */
426 while (!list_empty(head)) {
427 prepare_to_wait(&mdev->ee_wait, &wait, TASK_UNINTERRUPTIBLE);
428 spin_unlock_irq(&mdev->req_lock);
Jens Axboe7eaceac2011-03-10 08:52:07 +0100429 io_schedule();
Philipp Reisnerb411b362009-09-25 16:07:19 -0700430 finish_wait(&mdev->ee_wait, &wait);
431 spin_lock_irq(&mdev->req_lock);
432 }
433}
434
435void drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head)
436{
437 spin_lock_irq(&mdev->req_lock);
438 _drbd_wait_ee_list_empty(mdev, head);
439 spin_unlock_irq(&mdev->req_lock);
440}
441
442/* see also kernel_accept; which is only present since 2.6.18.
443 * also we want to log which part of it failed, exactly */
444static int drbd_accept(struct drbd_conf *mdev, const char **what,
445 struct socket *sock, struct socket **newsock)
446{
447 struct sock *sk = sock->sk;
448 int err = 0;
449
450 *what = "listen";
451 err = sock->ops->listen(sock, 5);
452 if (err < 0)
453 goto out;
454
455 *what = "sock_create_lite";
456 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
457 newsock);
458 if (err < 0)
459 goto out;
460
461 *what = "accept";
462 err = sock->ops->accept(sock, *newsock, 0);
463 if (err < 0) {
464 sock_release(*newsock);
465 *newsock = NULL;
466 goto out;
467 }
468 (*newsock)->ops = sock->ops;
469
470out:
471 return err;
472}
473
474static int drbd_recv_short(struct drbd_conf *mdev, struct socket *sock,
475 void *buf, size_t size, int flags)
476{
477 mm_segment_t oldfs;
478 struct kvec iov = {
479 .iov_base = buf,
480 .iov_len = size,
481 };
482 struct msghdr msg = {
483 .msg_iovlen = 1,
484 .msg_iov = (struct iovec *)&iov,
485 .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL)
486 };
487 int rv;
488
489 oldfs = get_fs();
490 set_fs(KERNEL_DS);
491 rv = sock_recvmsg(sock, &msg, size, msg.msg_flags);
492 set_fs(oldfs);
493
494 return rv;
495}
496
497static int drbd_recv(struct drbd_conf *mdev, void *buf, size_t size)
498{
499 mm_segment_t oldfs;
500 struct kvec iov = {
501 .iov_base = buf,
502 .iov_len = size,
503 };
504 struct msghdr msg = {
505 .msg_iovlen = 1,
506 .msg_iov = (struct iovec *)&iov,
507 .msg_flags = MSG_WAITALL | MSG_NOSIGNAL
508 };
509 int rv;
510
511 oldfs = get_fs();
512 set_fs(KERNEL_DS);
513
514 for (;;) {
515 rv = sock_recvmsg(mdev->data.socket, &msg, size, msg.msg_flags);
516 if (rv == size)
517 break;
518
519 /* Note:
520 * ECONNRESET other side closed the connection
521 * ERESTARTSYS (on sock) we got a signal
522 */
523
524 if (rv < 0) {
525 if (rv == -ECONNRESET)
526 dev_info(DEV, "sock was reset by peer\n");
527 else if (rv != -ERESTARTSYS)
528 dev_err(DEV, "sock_recvmsg returned %d\n", rv);
529 break;
530 } else if (rv == 0) {
531 dev_info(DEV, "sock was shut down by peer\n");
532 break;
533 } else {
534 /* signal came in, or peer/link went down,
535 * after we read a partial message
536 */
537 /* D_ASSERT(signal_pending(current)); */
538 break;
539 }
540 };
541
542 set_fs(oldfs);
543
544 if (rv != size)
545 drbd_force_state(mdev, NS(conn, C_BROKEN_PIPE));
546
547 return rv;
548}
549
Lars Ellenberg5dbf1672010-05-25 16:18:01 +0200550/* quoting tcp(7):
551 * On individual connections, the socket buffer size must be set prior to the
552 * listen(2) or connect(2) calls in order to have it take effect.
553 * This is our wrapper to do so.
554 */
555static void drbd_setbufsize(struct socket *sock, unsigned int snd,
556 unsigned int rcv)
557{
558 /* open coded SO_SNDBUF, SO_RCVBUF */
559 if (snd) {
560 sock->sk->sk_sndbuf = snd;
561 sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
562 }
563 if (rcv) {
564 sock->sk->sk_rcvbuf = rcv;
565 sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
566 }
567}
568
Philipp Reisnerb411b362009-09-25 16:07:19 -0700569static struct socket *drbd_try_connect(struct drbd_conf *mdev)
570{
571 const char *what;
572 struct socket *sock;
573 struct sockaddr_in6 src_in6;
574 int err;
575 int disconnect_on_error = 1;
576
577 if (!get_net_conf(mdev))
578 return NULL;
579
580 what = "sock_create_kern";
581 err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family,
582 SOCK_STREAM, IPPROTO_TCP, &sock);
583 if (err < 0) {
584 sock = NULL;
585 goto out;
586 }
587
588 sock->sk->sk_rcvtimeo =
589 sock->sk->sk_sndtimeo = mdev->net_conf->try_connect_int*HZ;
Lars Ellenberg5dbf1672010-05-25 16:18:01 +0200590 drbd_setbufsize(sock, mdev->net_conf->sndbuf_size,
591 mdev->net_conf->rcvbuf_size);
Philipp Reisnerb411b362009-09-25 16:07:19 -0700592
593 /* explicitly bind to the configured IP as source IP
594 * for the outgoing connections.
595 * This is needed for multihomed hosts and to be
596 * able to use lo: interfaces for drbd.
597 * Make sure to use 0 as port number, so linux selects
598 * a free one dynamically.
599 */
600 memcpy(&src_in6, mdev->net_conf->my_addr,
601 min_t(int, mdev->net_conf->my_addr_len, sizeof(src_in6)));
602 if (((struct sockaddr *)mdev->net_conf->my_addr)->sa_family == AF_INET6)
603 src_in6.sin6_port = 0;
604 else
605 ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */
606
607 what = "bind before connect";
608 err = sock->ops->bind(sock,
609 (struct sockaddr *) &src_in6,
610 mdev->net_conf->my_addr_len);
611 if (err < 0)
612 goto out;
613
614 /* connect may fail, peer not yet available.
615 * stay C_WF_CONNECTION, don't go Disconnecting! */
616 disconnect_on_error = 0;
617 what = "connect";
618 err = sock->ops->connect(sock,
619 (struct sockaddr *)mdev->net_conf->peer_addr,
620 mdev->net_conf->peer_addr_len, 0);
621
622out:
623 if (err < 0) {
624 if (sock) {
625 sock_release(sock);
626 sock = NULL;
627 }
628 switch (-err) {
629 /* timeout, busy, signal pending */
630 case ETIMEDOUT: case EAGAIN: case EINPROGRESS:
631 case EINTR: case ERESTARTSYS:
632 /* peer not (yet) available, network problem */
633 case ECONNREFUSED: case ENETUNREACH:
634 case EHOSTDOWN: case EHOSTUNREACH:
635 disconnect_on_error = 0;
636 break;
637 default:
638 dev_err(DEV, "%s failed, err = %d\n", what, err);
639 }
640 if (disconnect_on_error)
641 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
642 }
643 put_net_conf(mdev);
644 return sock;
645}
646
647static struct socket *drbd_wait_for_connect(struct drbd_conf *mdev)
648{
649 int timeo, err;
650 struct socket *s_estab = NULL, *s_listen;
651 const char *what;
652
653 if (!get_net_conf(mdev))
654 return NULL;
655
656 what = "sock_create_kern";
657 err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family,
658 SOCK_STREAM, IPPROTO_TCP, &s_listen);
659 if (err) {
660 s_listen = NULL;
661 goto out;
662 }
663
664 timeo = mdev->net_conf->try_connect_int * HZ;
665 timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */
666
667 s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */
668 s_listen->sk->sk_rcvtimeo = timeo;
669 s_listen->sk->sk_sndtimeo = timeo;
Lars Ellenberg5dbf1672010-05-25 16:18:01 +0200670 drbd_setbufsize(s_listen, mdev->net_conf->sndbuf_size,
671 mdev->net_conf->rcvbuf_size);
Philipp Reisnerb411b362009-09-25 16:07:19 -0700672
673 what = "bind before listen";
674 err = s_listen->ops->bind(s_listen,
675 (struct sockaddr *) mdev->net_conf->my_addr,
676 mdev->net_conf->my_addr_len);
677 if (err < 0)
678 goto out;
679
680 err = drbd_accept(mdev, &what, s_listen, &s_estab);
681
682out:
683 if (s_listen)
684 sock_release(s_listen);
685 if (err < 0) {
686 if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) {
687 dev_err(DEV, "%s failed, err = %d\n", what, err);
688 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
689 }
690 }
691 put_net_conf(mdev);
692
693 return s_estab;
694}
695
696static int drbd_send_fp(struct drbd_conf *mdev,
697 struct socket *sock, enum drbd_packets cmd)
698{
Philipp Reisner02918be2010-08-20 14:35:10 +0200699 struct p_header80 *h = &mdev->data.sbuf.header.h80;
Philipp Reisnerb411b362009-09-25 16:07:19 -0700700
701 return _drbd_send_cmd(mdev, sock, cmd, h, sizeof(*h), 0);
702}
703
704static enum drbd_packets drbd_recv_fp(struct drbd_conf *mdev, struct socket *sock)
705{
Philipp Reisner02918be2010-08-20 14:35:10 +0200706 struct p_header80 *h = &mdev->data.rbuf.header.h80;
Philipp Reisnerb411b362009-09-25 16:07:19 -0700707 int rr;
708
709 rr = drbd_recv_short(mdev, sock, h, sizeof(*h), 0);
710
711 if (rr == sizeof(*h) && h->magic == BE_DRBD_MAGIC)
712 return be16_to_cpu(h->command);
713
714 return 0xffff;
715}
716
717/**
718 * drbd_socket_okay() - Free the socket if its connection is not okay
719 * @mdev: DRBD device.
720 * @sock: pointer to the pointer to the socket.
721 */
722static int drbd_socket_okay(struct drbd_conf *mdev, struct socket **sock)
723{
724 int rr;
725 char tb[4];
726
727 if (!*sock)
728 return FALSE;
729
730 rr = drbd_recv_short(mdev, *sock, tb, 4, MSG_DONTWAIT | MSG_PEEK);
731
732 if (rr > 0 || rr == -EAGAIN) {
733 return TRUE;
734 } else {
735 sock_release(*sock);
736 *sock = NULL;
737 return FALSE;
738 }
739}
740
741/*
742 * return values:
743 * 1 yes, we have a valid connection
744 * 0 oops, did not work out, please try again
745 * -1 peer talks different language,
746 * no point in trying again, please go standalone.
747 * -2 We do not have a network config...
748 */
749static int drbd_connect(struct drbd_conf *mdev)
750{
751 struct socket *s, *sock, *msock;
752 int try, h, ok;
753
754 D_ASSERT(!mdev->data.socket);
755
Philipp Reisnerb411b362009-09-25 16:07:19 -0700756 if (drbd_request_state(mdev, NS(conn, C_WF_CONNECTION)) < SS_SUCCESS)
757 return -2;
758
759 clear_bit(DISCARD_CONCURRENT, &mdev->flags);
760
761 sock = NULL;
762 msock = NULL;
763
764 do {
765 for (try = 0;;) {
766 /* 3 tries, this should take less than a second! */
767 s = drbd_try_connect(mdev);
768 if (s || ++try >= 3)
769 break;
770 /* give the other side time to call bind() & listen() */
771 __set_current_state(TASK_INTERRUPTIBLE);
772 schedule_timeout(HZ / 10);
773 }
774
775 if (s) {
776 if (!sock) {
777 drbd_send_fp(mdev, s, P_HAND_SHAKE_S);
778 sock = s;
779 s = NULL;
780 } else if (!msock) {
781 drbd_send_fp(mdev, s, P_HAND_SHAKE_M);
782 msock = s;
783 s = NULL;
784 } else {
785 dev_err(DEV, "Logic error in drbd_connect()\n");
786 goto out_release_sockets;
787 }
788 }
789
790 if (sock && msock) {
791 __set_current_state(TASK_INTERRUPTIBLE);
792 schedule_timeout(HZ / 10);
793 ok = drbd_socket_okay(mdev, &sock);
794 ok = drbd_socket_okay(mdev, &msock) && ok;
795 if (ok)
796 break;
797 }
798
799retry:
800 s = drbd_wait_for_connect(mdev);
801 if (s) {
802 try = drbd_recv_fp(mdev, s);
803 drbd_socket_okay(mdev, &sock);
804 drbd_socket_okay(mdev, &msock);
805 switch (try) {
806 case P_HAND_SHAKE_S:
807 if (sock) {
808 dev_warn(DEV, "initial packet S crossed\n");
809 sock_release(sock);
810 }
811 sock = s;
812 break;
813 case P_HAND_SHAKE_M:
814 if (msock) {
815 dev_warn(DEV, "initial packet M crossed\n");
816 sock_release(msock);
817 }
818 msock = s;
819 set_bit(DISCARD_CONCURRENT, &mdev->flags);
820 break;
821 default:
822 dev_warn(DEV, "Error receiving initial packet\n");
823 sock_release(s);
824 if (random32() & 1)
825 goto retry;
826 }
827 }
828
829 if (mdev->state.conn <= C_DISCONNECTING)
830 goto out_release_sockets;
831 if (signal_pending(current)) {
832 flush_signals(current);
833 smp_rmb();
834 if (get_t_state(&mdev->receiver) == Exiting)
835 goto out_release_sockets;
836 }
837
838 if (sock && msock) {
839 ok = drbd_socket_okay(mdev, &sock);
840 ok = drbd_socket_okay(mdev, &msock) && ok;
841 if (ok)
842 break;
843 }
844 } while (1);
845
846 msock->sk->sk_reuse = 1; /* SO_REUSEADDR */
847 sock->sk->sk_reuse = 1; /* SO_REUSEADDR */
848
849 sock->sk->sk_allocation = GFP_NOIO;
850 msock->sk->sk_allocation = GFP_NOIO;
851
852 sock->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK;
853 msock->sk->sk_priority = TC_PRIO_INTERACTIVE;
854
Philipp Reisnerb411b362009-09-25 16:07:19 -0700855 /* NOT YET ...
856 * sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10;
857 * sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
858 * first set it to the P_HAND_SHAKE timeout,
859 * which we set to 4x the configured ping_timeout. */
860 sock->sk->sk_sndtimeo =
861 sock->sk->sk_rcvtimeo = mdev->net_conf->ping_timeo*4*HZ/10;
862
863 msock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10;
864 msock->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ;
865
866 /* we don't want delays.
867 * we use TCP_CORK where apropriate, though */
868 drbd_tcp_nodelay(sock);
869 drbd_tcp_nodelay(msock);
870
871 mdev->data.socket = sock;
872 mdev->meta.socket = msock;
873 mdev->last_received = jiffies;
874
875 D_ASSERT(mdev->asender.task == NULL);
876
877 h = drbd_do_handshake(mdev);
878 if (h <= 0)
879 return h;
880
881 if (mdev->cram_hmac_tfm) {
882 /* drbd_request_state(mdev, NS(conn, WFAuth)); */
Johannes Thomab10d96c2010-01-07 16:02:50 +0100883 switch (drbd_do_auth(mdev)) {
884 case -1:
Philipp Reisnerb411b362009-09-25 16:07:19 -0700885 dev_err(DEV, "Authentication of peer failed\n");
886 return -1;
Johannes Thomab10d96c2010-01-07 16:02:50 +0100887 case 0:
888 dev_err(DEV, "Authentication of peer failed, trying again.\n");
889 return 0;
Philipp Reisnerb411b362009-09-25 16:07:19 -0700890 }
891 }
892
893 if (drbd_request_state(mdev, NS(conn, C_WF_REPORT_PARAMS)) < SS_SUCCESS)
894 return 0;
895
896 sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10;
897 sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
898
899 atomic_set(&mdev->packet_seq, 0);
900 mdev->peer_seq = 0;
901
902 drbd_thread_start(&mdev->asender);
903
Philipp Reisnerd5373382010-08-23 15:18:33 +0200904 if (mdev->agreed_pro_version < 95 && get_ldev(mdev)) {
905 drbd_setup_queue_param(mdev, DRBD_MAX_SIZE_H80_PACKET);
906 put_ldev(mdev);
907 }
908
Philipp Reisner7e2455c2010-04-22 14:50:23 +0200909 if (!drbd_send_protocol(mdev))
910 return -1;
Philipp Reisnerb411b362009-09-25 16:07:19 -0700911 drbd_send_sync_param(mdev, &mdev->sync_conf);
Philipp Reisnere89b5912010-03-24 17:11:33 +0100912 drbd_send_sizes(mdev, 0, 0);
Philipp Reisnerb411b362009-09-25 16:07:19 -0700913 drbd_send_uuids(mdev);
914 drbd_send_state(mdev);
915 clear_bit(USE_DEGR_WFC_T, &mdev->flags);
916 clear_bit(RESIZE_PENDING, &mdev->flags);
917
918 return 1;
919
920out_release_sockets:
921 if (sock)
922 sock_release(sock);
923 if (msock)
924 sock_release(msock);
925 return -1;
926}
927
Philipp Reisner02918be2010-08-20 14:35:10 +0200928static int drbd_recv_header(struct drbd_conf *mdev, enum drbd_packets *cmd, unsigned int *packet_size)
Philipp Reisnerb411b362009-09-25 16:07:19 -0700929{
Philipp Reisner02918be2010-08-20 14:35:10 +0200930 union p_header *h = &mdev->data.rbuf.header;
Philipp Reisnerb411b362009-09-25 16:07:19 -0700931 int r;
932
933 r = drbd_recv(mdev, h, sizeof(*h));
Philipp Reisnerb411b362009-09-25 16:07:19 -0700934 if (unlikely(r != sizeof(*h))) {
935 dev_err(DEV, "short read expecting header on sock: r=%d\n", r);
936 return FALSE;
Philipp Reisner02918be2010-08-20 14:35:10 +0200937 }
938
939 if (likely(h->h80.magic == BE_DRBD_MAGIC)) {
940 *cmd = be16_to_cpu(h->h80.command);
941 *packet_size = be16_to_cpu(h->h80.length);
942 } else if (h->h95.magic == BE_DRBD_MAGIC_BIG) {
943 *cmd = be16_to_cpu(h->h95.command);
944 *packet_size = be32_to_cpu(h->h95.length);
945 } else {
Lars Ellenberg004352f2010-10-05 20:13:58 +0200946 dev_err(DEV, "magic?? on data m: 0x%08x c: %d l: %d\n",
947 be32_to_cpu(h->h80.magic),
948 be16_to_cpu(h->h80.command),
949 be16_to_cpu(h->h80.length));
Philipp Reisnerb411b362009-09-25 16:07:19 -0700950 return FALSE;
951 }
952 mdev->last_received = jiffies;
953
954 return TRUE;
955}
956
Philipp Reisner2451fc32010-08-24 13:43:11 +0200957static void drbd_flush(struct drbd_conf *mdev)
Philipp Reisnerb411b362009-09-25 16:07:19 -0700958{
959 int rv;
960
961 if (mdev->write_ordering >= WO_bdev_flush && get_ldev(mdev)) {
Dmitry Monakhovfbd9b092010-04-28 17:55:06 +0400962 rv = blkdev_issue_flush(mdev->ldev->backing_bdev, GFP_KERNEL,
Christoph Hellwigdd3932e2010-09-16 20:51:46 +0200963 NULL);
Philipp Reisnerb411b362009-09-25 16:07:19 -0700964 if (rv) {
965 dev_err(DEV, "local disk flush failed with status %d\n", rv);
966 /* would rather check on EOPNOTSUPP, but that is not reliable.
967 * don't try again for ANY return value != 0
968 * if (rv == -EOPNOTSUPP) */
969 drbd_bump_write_ordering(mdev, WO_drain_io);
970 }
971 put_ldev(mdev);
972 }
Philipp Reisnerb411b362009-09-25 16:07:19 -0700973}
974
975/**
976 * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it.
977 * @mdev: DRBD device.
978 * @epoch: Epoch object.
979 * @ev: Epoch event.
980 */
981static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev,
982 struct drbd_epoch *epoch,
983 enum epoch_event ev)
984{
Philipp Reisner2451fc32010-08-24 13:43:11 +0200985 int epoch_size;
Philipp Reisnerb411b362009-09-25 16:07:19 -0700986 struct drbd_epoch *next_epoch;
Philipp Reisnerb411b362009-09-25 16:07:19 -0700987 enum finish_epoch rv = FE_STILL_LIVE;
988
989 spin_lock(&mdev->epoch_lock);
990 do {
991 next_epoch = NULL;
Philipp Reisnerb411b362009-09-25 16:07:19 -0700992
993 epoch_size = atomic_read(&epoch->epoch_size);
994
995 switch (ev & ~EV_CLEANUP) {
996 case EV_PUT:
997 atomic_dec(&epoch->active);
998 break;
999 case EV_GOT_BARRIER_NR:
1000 set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags);
Philipp Reisnerb411b362009-09-25 16:07:19 -07001001 break;
1002 case EV_BECAME_LAST:
1003 /* nothing to do*/
1004 break;
1005 }
1006
Philipp Reisnerb411b362009-09-25 16:07:19 -07001007 if (epoch_size != 0 &&
1008 atomic_read(&epoch->active) == 0 &&
Philipp Reisner2451fc32010-08-24 13:43:11 +02001009 test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) {
Philipp Reisnerb411b362009-09-25 16:07:19 -07001010 if (!(ev & EV_CLEANUP)) {
1011 spin_unlock(&mdev->epoch_lock);
1012 drbd_send_b_ack(mdev, epoch->barrier_nr, epoch_size);
1013 spin_lock(&mdev->epoch_lock);
1014 }
1015 dec_unacked(mdev);
1016
1017 if (mdev->current_epoch != epoch) {
1018 next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list);
1019 list_del(&epoch->list);
1020 ev = EV_BECAME_LAST | (ev & EV_CLEANUP);
1021 mdev->epochs--;
Philipp Reisnerb411b362009-09-25 16:07:19 -07001022 kfree(epoch);
1023
1024 if (rv == FE_STILL_LIVE)
1025 rv = FE_DESTROYED;
1026 } else {
1027 epoch->flags = 0;
1028 atomic_set(&epoch->epoch_size, 0);
Uwe Kleine-König698f9312010-07-02 20:41:51 +02001029 /* atomic_set(&epoch->active, 0); is already zero */
Philipp Reisnerb411b362009-09-25 16:07:19 -07001030 if (rv == FE_STILL_LIVE)
1031 rv = FE_RECYCLED;
Philipp Reisner2451fc32010-08-24 13:43:11 +02001032 wake_up(&mdev->ee_wait);
Philipp Reisnerb411b362009-09-25 16:07:19 -07001033 }
1034 }
1035
1036 if (!next_epoch)
1037 break;
1038
1039 epoch = next_epoch;
1040 } while (1);
1041
1042 spin_unlock(&mdev->epoch_lock);
1043
Philipp Reisnerb411b362009-09-25 16:07:19 -07001044 return rv;
1045}
1046
1047/**
1048 * drbd_bump_write_ordering() - Fall back to an other write ordering method
1049 * @mdev: DRBD device.
1050 * @wo: Write ordering method to try.
1051 */
1052void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo) __must_hold(local)
1053{
1054 enum write_ordering_e pwo;
1055 static char *write_ordering_str[] = {
1056 [WO_none] = "none",
1057 [WO_drain_io] = "drain",
1058 [WO_bdev_flush] = "flush",
Philipp Reisnerb411b362009-09-25 16:07:19 -07001059 };
1060
1061 pwo = mdev->write_ordering;
1062 wo = min(pwo, wo);
Philipp Reisnerb411b362009-09-25 16:07:19 -07001063 if (wo == WO_bdev_flush && mdev->ldev->dc.no_disk_flush)
1064 wo = WO_drain_io;
1065 if (wo == WO_drain_io && mdev->ldev->dc.no_disk_drain)
1066 wo = WO_none;
1067 mdev->write_ordering = wo;
Philipp Reisner2451fc32010-08-24 13:43:11 +02001068 if (pwo != mdev->write_ordering || wo == WO_bdev_flush)
Philipp Reisnerb411b362009-09-25 16:07:19 -07001069 dev_info(DEV, "Method to ensure write ordering: %s\n", write_ordering_str[mdev->write_ordering]);
1070}
1071
1072/**
Lars Ellenberg45bb9122010-05-14 17:10:48 +02001073 * drbd_submit_ee()
1074 * @mdev: DRBD device.
1075 * @e: epoch entry
1076 * @rw: flag field, see bio->bi_rw
1077 */
1078/* TODO allocate from our own bio_set. */
1079int drbd_submit_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e,
1080 const unsigned rw, const int fault_type)
1081{
1082 struct bio *bios = NULL;
1083 struct bio *bio;
1084 struct page *page = e->pages;
1085 sector_t sector = e->sector;
1086 unsigned ds = e->size;
1087 unsigned n_bios = 0;
1088 unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT;
1089
1090 /* In most cases, we will only need one bio. But in case the lower
1091 * level restrictions happen to be different at this offset on this
1092 * side than those of the sending peer, we may need to submit the
1093 * request in more than one bio. */
1094next_bio:
1095 bio = bio_alloc(GFP_NOIO, nr_pages);
1096 if (!bio) {
1097 dev_err(DEV, "submit_ee: Allocation of a bio failed\n");
1098 goto fail;
1099 }
1100 /* > e->sector, unless this is the first bio */
1101 bio->bi_sector = sector;
1102 bio->bi_bdev = mdev->ldev->backing_bdev;
Lars Ellenberg45bb9122010-05-14 17:10:48 +02001103 bio->bi_rw = rw;
1104 bio->bi_private = e;
1105 bio->bi_end_io = drbd_endio_sec;
1106
1107 bio->bi_next = bios;
1108 bios = bio;
1109 ++n_bios;
1110
1111 page_chain_for_each(page) {
1112 unsigned len = min_t(unsigned, ds, PAGE_SIZE);
1113 if (!bio_add_page(bio, page, len, 0)) {
1114 /* a single page must always be possible! */
1115 BUG_ON(bio->bi_vcnt == 0);
1116 goto next_bio;
1117 }
1118 ds -= len;
1119 sector += len >> 9;
1120 --nr_pages;
1121 }
1122 D_ASSERT(page == NULL);
1123 D_ASSERT(ds == 0);
1124
1125 atomic_set(&e->pending_bios, n_bios);
1126 do {
1127 bio = bios;
1128 bios = bios->bi_next;
1129 bio->bi_next = NULL;
1130
Lars Ellenberg45bb9122010-05-14 17:10:48 +02001131 drbd_generic_make_request(mdev, fault_type, bio);
Lars Ellenberg45bb9122010-05-14 17:10:48 +02001132 } while (bios);
Lars Ellenberg45bb9122010-05-14 17:10:48 +02001133 return 0;
1134
1135fail:
1136 while (bios) {
1137 bio = bios;
1138 bios = bios->bi_next;
1139 bio_put(bio);
1140 }
1141 return -ENOMEM;
1142}
1143
Philipp Reisner02918be2010-08-20 14:35:10 +02001144static int receive_Barrier(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
Philipp Reisnerb411b362009-09-25 16:07:19 -07001145{
Philipp Reisner2451fc32010-08-24 13:43:11 +02001146 int rv;
Philipp Reisner02918be2010-08-20 14:35:10 +02001147 struct p_barrier *p = &mdev->data.rbuf.barrier;
Philipp Reisnerb411b362009-09-25 16:07:19 -07001148 struct drbd_epoch *epoch;
1149
Philipp Reisnerb411b362009-09-25 16:07:19 -07001150 inc_unacked(mdev);
1151
Philipp Reisnerb411b362009-09-25 16:07:19 -07001152 mdev->current_epoch->barrier_nr = p->barrier;
1153 rv = drbd_may_finish_epoch(mdev, mdev->current_epoch, EV_GOT_BARRIER_NR);
1154
1155 /* P_BARRIER_ACK may imply that the corresponding extent is dropped from
1156 * the activity log, which means it would not be resynced in case the
1157 * R_PRIMARY crashes now.
1158 * Therefore we must send the barrier_ack after the barrier request was
1159 * completed. */
1160 switch (mdev->write_ordering) {
Philipp Reisnerb411b362009-09-25 16:07:19 -07001161 case WO_none:
1162 if (rv == FE_RECYCLED)
1163 return TRUE;
Philipp Reisner2451fc32010-08-24 13:43:11 +02001164
1165 /* receiver context, in the writeout path of the other node.
1166 * avoid potential distributed deadlock */
1167 epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO);
1168 if (epoch)
1169 break;
1170 else
1171 dev_warn(DEV, "Allocation of an epoch failed, slowing down\n");
1172 /* Fall through */
Philipp Reisnerb411b362009-09-25 16:07:19 -07001173
1174 case WO_bdev_flush:
1175 case WO_drain_io:
Philipp Reisnerb411b362009-09-25 16:07:19 -07001176 drbd_wait_ee_list_empty(mdev, &mdev->active_ee);
Philipp Reisner2451fc32010-08-24 13:43:11 +02001177 drbd_flush(mdev);
1178
1179 if (atomic_read(&mdev->current_epoch->epoch_size)) {
1180 epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO);
1181 if (epoch)
1182 break;
Philipp Reisnerb411b362009-09-25 16:07:19 -07001183 }
1184
Philipp Reisner2451fc32010-08-24 13:43:11 +02001185 epoch = mdev->current_epoch;
1186 wait_event(mdev->ee_wait, atomic_read(&epoch->epoch_size) == 0);
1187
1188 D_ASSERT(atomic_read(&epoch->active) == 0);
1189 D_ASSERT(epoch->flags == 0);
Philipp Reisnerb411b362009-09-25 16:07:19 -07001190
1191 return TRUE;
Philipp Reisner2451fc32010-08-24 13:43:11 +02001192 default:
1193 dev_err(DEV, "Strangeness in mdev->write_ordering %d\n", mdev->write_ordering);
1194 return FALSE;
Philipp Reisnerb411b362009-09-25 16:07:19 -07001195 }
1196
1197 epoch->flags = 0;
1198 atomic_set(&epoch->epoch_size, 0);
1199 atomic_set(&epoch->active, 0);
1200
1201 spin_lock(&mdev->epoch_lock);
1202 if (atomic_read(&mdev->current_epoch->epoch_size)) {
1203 list_add(&epoch->list, &mdev->current_epoch->list);
1204 mdev->current_epoch = epoch;
1205 mdev->epochs++;
Philipp Reisnerb411b362009-09-25 16:07:19 -07001206 } else {
1207 /* The current_epoch got recycled while we allocated this one... */
1208 kfree(epoch);
1209 }
1210 spin_unlock(&mdev->epoch_lock);
1211
1212 return TRUE;
1213}
1214
1215/* used from receive_RSDataReply (recv_resync_read)
1216 * and from receive_Data */
1217static struct drbd_epoch_entry *
1218read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, int data_size) __must_hold(local)
1219{
Lars Ellenberg66660322010-04-06 12:15:04 +02001220 const sector_t capacity = drbd_get_capacity(mdev->this_bdev);
Philipp Reisnerb411b362009-09-25 16:07:19 -07001221 struct drbd_epoch_entry *e;
Philipp Reisnerb411b362009-09-25 16:07:19 -07001222 struct page *page;
Lars Ellenberg45bb9122010-05-14 17:10:48 +02001223 int dgs, ds, rr;
Philipp Reisnerb411b362009-09-25 16:07:19 -07001224 void *dig_in = mdev->int_dig_in;
1225 void *dig_vv = mdev->int_dig_vv;
Philipp Reisner6b4388a2010-04-26 14:11:45 +02001226 unsigned long *data;
Philipp Reisnerb411b362009-09-25 16:07:19 -07001227
1228 dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ?
1229 crypto_hash_digestsize(mdev->integrity_r_tfm) : 0;
1230
1231 if (dgs) {
1232 rr = drbd_recv(mdev, dig_in, dgs);
1233 if (rr != dgs) {
1234 dev_warn(DEV, "short read receiving data digest: read %d expected %d\n",
1235 rr, dgs);
1236 return NULL;
1237 }
1238 }
1239
1240 data_size -= dgs;
1241
1242 ERR_IF(data_size & 0x1ff) return NULL;
Lars Ellenberg1816a2b2010-11-11 15:19:07 +01001243 ERR_IF(data_size > DRBD_MAX_BIO_SIZE) return NULL;
Philipp Reisnerb411b362009-09-25 16:07:19 -07001244
Lars Ellenberg66660322010-04-06 12:15:04 +02001245 /* even though we trust out peer,
1246 * we sometimes have to double check. */
1247 if (sector + (data_size>>9) > capacity) {
1248 dev_err(DEV, "capacity: %llus < sector: %llus + size: %u\n",
1249 (unsigned long long)capacity,
1250 (unsigned long long)sector, data_size);
1251 return NULL;
1252 }
1253
Philipp Reisnerb411b362009-09-25 16:07:19 -07001254 /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD
1255 * "criss-cross" setup, that might cause write-out on some other DRBD,
1256 * which in turn might block on the other node at this very place. */
1257 e = drbd_alloc_ee(mdev, id, sector, data_size, GFP_NOIO);
1258 if (!e)
1259 return NULL;
Lars Ellenberg45bb9122010-05-14 17:10:48 +02001260
Philipp Reisnerb411b362009-09-25 16:07:19 -07001261 ds = data_size;
Lars Ellenberg45bb9122010-05-14 17:10:48 +02001262 page = e->pages;
1263 page_chain_for_each(page) {
1264 unsigned len = min_t(int, ds, PAGE_SIZE);
Philipp Reisner6b4388a2010-04-26 14:11:45 +02001265 data = kmap(page);
Lars Ellenberg45bb9122010-05-14 17:10:48 +02001266 rr = drbd_recv(mdev, data, len);
Andreas Gruenbacher0cf9d272010-12-07 10:43:29 +01001267 if (drbd_insert_fault(mdev, DRBD_FAULT_RECEIVE)) {
Philipp Reisner6b4388a2010-04-26 14:11:45 +02001268 dev_err(DEV, "Fault injection: Corrupting data on receive\n");
1269 data[0] = data[0] ^ (unsigned long)-1;
1270 }
Philipp Reisnerb411b362009-09-25 16:07:19 -07001271 kunmap(page);
Lars Ellenberg45bb9122010-05-14 17:10:48 +02001272 if (rr != len) {
Philipp Reisnerb411b362009-09-25 16:07:19 -07001273 drbd_free_ee(mdev, e);
1274 dev_warn(DEV, "short read receiving data: read %d expected %d\n",
Lars Ellenberg45bb9122010-05-14 17:10:48 +02001275 rr, len);
Philipp Reisnerb411b362009-09-25 16:07:19 -07001276 return NULL;
1277 }
1278 ds -= rr;
1279 }
1280
1281 if (dgs) {
Lars Ellenberg45bb9122010-05-14 17:10:48 +02001282 drbd_csum_ee(mdev, mdev->integrity_r_tfm, e, dig_vv);
Philipp Reisnerb411b362009-09-25 16:07:19 -07001283 if (memcmp(dig_in, dig_vv, dgs)) {
Lars Ellenberg470be442010-11-10 10:36:52 +01001284 dev_err(DEV, "Digest integrity check FAILED: %llus +%u\n",
1285 (unsigned long long)sector, data_size);
Philipp Reisnerb411b362009-09-25 16:07:19 -07001286 drbd_bcast_ee(mdev, "digest failed",
1287 dgs, dig_in, dig_vv, e);
1288 drbd_free_ee(mdev, e);
1289 return NULL;
1290 }
1291 }
1292 mdev->recv_cnt += data_size>>9;
1293 return e;
1294}
1295
1296/* drbd_drain_block() just takes a data block
1297 * out of the socket input buffer, and discards it.
1298 */
1299static int drbd_drain_block(struct drbd_conf *mdev, int data_size)
1300{
1301 struct page *page;
1302 int rr, rv = 1;
1303 void *data;
1304
Lars Ellenbergc3470cd2010-04-01 16:57:19 +02001305 if (!data_size)
1306 return TRUE;
1307
Lars Ellenberg45bb9122010-05-14 17:10:48 +02001308 page = drbd_pp_alloc(mdev, 1, 1);
Philipp Reisnerb411b362009-09-25 16:07:19 -07001309
1310 data = kmap(page);
1311 while (data_size) {
1312 rr = drbd_recv(mdev, data, min_t(int, data_size, PAGE_SIZE));
1313 if (rr != min_t(int, data_size, PAGE_SIZE)) {
1314 rv = 0;
1315 dev_warn(DEV, "short read receiving data: read %d expected %d\n",
1316 rr, min_t(int, data_size, PAGE_SIZE));
1317 break;
1318 }
1319 data_size -= rr;
1320 }
1321 kunmap(page);
Lars Ellenberg435f0742010-09-06 12:30:25 +02001322 drbd_pp_free(mdev, page, 0);
Philipp Reisnerb411b362009-09-25 16:07:19 -07001323 return rv;
1324}
1325
1326static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req,
1327 sector_t sector, int data_size)
1328{
1329 struct bio_vec *bvec;
1330 struct bio *bio;
1331 int dgs, rr, i, expect;
1332 void *dig_in = mdev->int_dig_in;
1333 void *dig_vv = mdev->int_dig_vv;
1334
1335 dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ?
1336 crypto_hash_digestsize(mdev->integrity_r_tfm) : 0;
1337
1338 if (dgs) {
1339 rr = drbd_recv(mdev, dig_in, dgs);
1340 if (rr != dgs) {
1341 dev_warn(DEV, "short read receiving data reply digest: read %d expected %d\n",
1342 rr, dgs);
1343 return 0;
1344 }
1345 }
1346
1347 data_size -= dgs;
1348
1349 /* optimistically update recv_cnt. if receiving fails below,
1350 * we disconnect anyways, and counters will be reset. */
1351 mdev->recv_cnt += data_size>>9;
1352
1353 bio = req->master_bio;
1354 D_ASSERT(sector == bio->bi_sector);
1355
1356 bio_for_each_segment(bvec, bio, i) {
1357 expect = min_t(int, data_size, bvec->bv_len);
1358 rr = drbd_recv(mdev,
1359 kmap(bvec->bv_page)+bvec->bv_offset,
1360 expect);
1361 kunmap(bvec->bv_page);
1362 if (rr != expect) {
1363 dev_warn(DEV, "short read receiving data reply: "
1364 "read %d expected %d\n",
1365 rr, expect);
1366 return 0;
1367 }
1368 data_size -= rr;
1369 }
1370
1371 if (dgs) {
Lars Ellenberg45bb9122010-05-14 17:10:48 +02001372 drbd_csum_bio(mdev, mdev->integrity_r_tfm, bio, dig_vv);
Philipp Reisnerb411b362009-09-25 16:07:19 -07001373 if (memcmp(dig_in, dig_vv, dgs)) {
1374 dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n");
1375 return 0;
1376 }
1377 }
1378
1379 D_ASSERT(data_size == 0);
1380 return 1;
1381}
1382
1383/* e_end_resync_block() is called via
1384 * drbd_process_done_ee() by asender only */
1385static int e_end_resync_block(struct drbd_conf *mdev, struct drbd_work *w, int unused)
1386{
1387 struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w;
1388 sector_t sector = e->sector;
1389 int ok;
1390
1391 D_ASSERT(hlist_unhashed(&e->colision));
1392
Lars Ellenberg45bb9122010-05-14 17:10:48 +02001393 if (likely((e->flags & EE_WAS_ERROR) == 0)) {
Philipp Reisnerb411b362009-09-25 16:07:19 -07001394 drbd_set_in_sync(mdev, sector, e->size);
1395 ok = drbd_send_ack(mdev, P_RS_WRITE_ACK, e);
1396 } else {
1397 /* Record failure to sync */
1398 drbd_rs_failed_io(mdev, sector, e->size);
1399
1400 ok = drbd_send_ack(mdev, P_NEG_ACK, e);
1401 }
1402 dec_unacked(mdev);
1403
1404 return ok;
1405}
1406
1407static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local)
1408{
1409 struct drbd_epoch_entry *e;
1410
1411 e = read_in_block(mdev, ID_SYNCER, sector, data_size);
Lars Ellenberg45bb9122010-05-14 17:10:48 +02001412 if (!e)
1413 goto fail;
Philipp Reisnerb411b362009-09-25 16:07:19 -07001414
1415 dec_rs_pending(mdev);
1416
Philipp Reisnerb411b362009-09-25 16:07:19 -07001417 inc_unacked(mdev);
1418 /* corresponding dec_unacked() in e_end_resync_block()
1419 * respective _drbd_clear_done_ee */
1420
Lars Ellenberg45bb9122010-05-14 17:10:48 +02001421 e->w.cb = e_end_resync_block;
1422
Philipp Reisnerb411b362009-09-25 16:07:19 -07001423 spin_lock_irq(&mdev->req_lock);
1424 list_add(&e->w.list, &mdev->sync_ee);
1425 spin_unlock_irq(&mdev->req_lock);
1426
Lars Ellenberg0f0601f2010-08-11 23:40:24 +02001427 atomic_add(data_size >> 9, &mdev->rs_sect_ev);
Lars Ellenberg45bb9122010-05-14 17:10:48 +02001428 if (drbd_submit_ee(mdev, e, WRITE, DRBD_FAULT_RS_WR) == 0)
1429 return TRUE;
Philipp Reisnerb411b362009-09-25 16:07:19 -07001430
Lars Ellenberg22cc37a2010-09-14 20:40:41 +02001431 /* drbd_submit_ee currently fails for one reason only:
1432 * not being able to allocate enough bios.
1433 * Is dropping the connection going to help? */
1434 spin_lock_irq(&mdev->req_lock);
1435 list_del(&e->w.list);
1436 spin_unlock_irq(&mdev->req_lock);
1437
Lars Ellenberg45bb9122010-05-14 17:10:48 +02001438 drbd_free_ee(mdev, e);
1439fail:
1440 put_ldev(mdev);
1441 return FALSE;
Philipp Reisnerb411b362009-09-25 16:07:19 -07001442}
1443
Philipp Reisner02918be2010-08-20 14:35:10 +02001444static int receive_DataReply(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
Philipp Reisnerb411b362009-09-25 16:07:19 -07001445{
1446 struct drbd_request *req;
1447 sector_t sector;
Philipp Reisnerb411b362009-09-25 16:07:19 -07001448 int ok;
Philipp Reisner02918be2010-08-20 14:35:10 +02001449 struct p_data *p = &mdev->data.rbuf.data;
Philipp Reisnerb411b362009-09-25 16:07:19 -07001450
1451 sector = be64_to_cpu(p->sector);
1452
1453 spin_lock_irq(&mdev->req_lock);
1454 req = _ar_id_to_req(mdev, p->block_id, sector);
1455 spin_unlock_irq(&mdev->req_lock);
1456 if (unlikely(!req)) {
1457 dev_err(DEV, "Got a corrupt block_id/sector pair(1).\n");
1458 return FALSE;
1459 }
1460
1461 /* hlist_del(&req->colision) is done in _req_may_be_done, to avoid
1462 * special casing it there for the various failure cases.
1463 * still no race with drbd_fail_pending_reads */
1464 ok = recv_dless_read(mdev, req, sector, data_size);
1465
1466 if (ok)
1467 req_mod(req, data_received);
1468 /* else: nothing. handled from drbd_disconnect...
1469 * I don't think we may complete this just yet
1470 * in case we are "on-disconnect: freeze" */
1471
1472 return ok;
1473}
1474
Philipp Reisner02918be2010-08-20 14:35:10 +02001475static int receive_RSDataReply(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
Philipp Reisnerb411b362009-09-25 16:07:19 -07001476{
1477 sector_t sector;
Philipp Reisnerb411b362009-09-25 16:07:19 -07001478 int ok;
Philipp Reisner02918be2010-08-20 14:35:10 +02001479 struct p_data *p = &mdev->data.rbuf.data;
Philipp Reisnerb411b362009-09-25 16:07:19 -07001480
1481 sector = be64_to_cpu(p->sector);
1482 D_ASSERT(p->block_id == ID_SYNCER);
1483
1484 if (get_ldev(mdev)) {
1485 /* data is submitted to disk within recv_resync_read.
1486 * corresponding put_ldev done below on error,
1487 * or in drbd_endio_write_sec. */
1488 ok = recv_resync_read(mdev, sector, data_size);
1489 } else {
1490 if (__ratelimit(&drbd_ratelimit_state))
1491 dev_err(DEV, "Can not write resync data to local disk.\n");
1492
1493 ok = drbd_drain_block(mdev, data_size);
1494
Lars Ellenberg2b2bf212010-10-06 11:46:55 +02001495 drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size);
Philipp Reisnerb411b362009-09-25 16:07:19 -07001496 }
1497
Philipp Reisner778f2712010-07-06 11:14:00 +02001498 atomic_add(data_size >> 9, &mdev->rs_sect_in);
1499
Philipp Reisnerb411b362009-09-25 16:07:19 -07001500 return ok;
1501}
1502
1503/* e_end_block() is called via drbd_process_done_ee().
1504 * this means this function only runs in the asender thread
1505 */
1506static int e_end_block(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
1507{
1508 struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w;
1509 sector_t sector = e->sector;
Philipp Reisnerb411b362009-09-25 16:07:19 -07001510 int ok = 1, pcmd;
1511
Philipp Reisnerb411b362009-09-25 16:07:19 -07001512 if (mdev->net_conf->wire_protocol == DRBD_PROT_C) {
Lars Ellenberg45bb9122010-05-14 17:10:48 +02001513 if (likely((e->flags & EE_WAS_ERROR) == 0)) {
Philipp Reisnerb411b362009-09-25 16:07:19 -07001514 pcmd = (mdev->state.conn >= C_SYNC_SOURCE &&
1515 mdev->state.conn <= C_PAUSED_SYNC_T &&
1516 e->flags & EE_MAY_SET_IN_SYNC) ?
1517 P_RS_WRITE_ACK : P_WRITE_ACK;
1518 ok &= drbd_send_ack(mdev, pcmd, e);
1519 if (pcmd == P_RS_WRITE_ACK)
1520 drbd_set_in_sync(mdev, sector, e->size);
1521 } else {
1522 ok = drbd_send_ack(mdev, P_NEG_ACK, e);
1523 /* we expect it to be marked out of sync anyways...
1524 * maybe assert this? */
1525 }
1526 dec_unacked(mdev);
1527 }
1528 /* we delete from the conflict detection hash _after_ we sent out the
1529 * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */
1530 if (mdev->net_conf->two_primaries) {
1531 spin_lock_irq(&mdev->req_lock);
1532 D_ASSERT(!hlist_unhashed(&e->colision));
1533 hlist_del_init(&e->colision);
1534 spin_unlock_irq(&mdev->req_lock);
1535 } else {
1536 D_ASSERT(hlist_unhashed(&e->colision));
1537 }
1538
1539 drbd_may_finish_epoch(mdev, e->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0));
1540
1541 return ok;
1542}
1543
1544static int e_send_discard_ack(struct drbd_conf *mdev, struct drbd_work *w, int unused)
1545{
1546 struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w;
1547 int ok = 1;
1548
1549 D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C);
1550 ok = drbd_send_ack(mdev, P_DISCARD_ACK, e);
1551
1552 spin_lock_irq(&mdev->req_lock);
1553 D_ASSERT(!hlist_unhashed(&e->colision));
1554 hlist_del_init(&e->colision);
1555 spin_unlock_irq(&mdev->req_lock);
1556
1557 dec_unacked(mdev);
1558
1559 return ok;
1560}
1561
1562/* Called from receive_Data.
1563 * Synchronize packets on sock with packets on msock.
1564 *
1565 * This is here so even when a P_DATA packet traveling via sock overtook an Ack
1566 * packet traveling on msock, they are still processed in the order they have
1567 * been sent.
1568 *
1569 * Note: we don't care for Ack packets overtaking P_DATA packets.
1570 *
1571 * In case packet_seq is larger than mdev->peer_seq number, there are
1572 * outstanding packets on the msock. We wait for them to arrive.
1573 * In case we are the logically next packet, we update mdev->peer_seq
1574 * ourselves. Correctly handles 32bit wrap around.
1575 *
1576 * Assume we have a 10 GBit connection, that is about 1<<30 byte per second,
1577 * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds
1578 * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have
1579 * 1<<9 == 512 seconds aka ages for the 32bit wrap around...
1580 *
1581 * returns 0 if we may process the packet,
1582 * -ERESTARTSYS if we were interrupted (by disconnect signal). */
1583static int drbd_wait_peer_seq(struct drbd_conf *mdev, const u32 packet_seq)
1584{
1585 DEFINE_WAIT(wait);
1586 unsigned int p_seq;
1587 long timeout;
1588 int ret = 0;
1589 spin_lock(&mdev->peer_seq_lock);
1590 for (;;) {
1591 prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE);
1592 if (seq_le(packet_seq, mdev->peer_seq+1))
1593 break;
1594 if (signal_pending(current)) {
1595 ret = -ERESTARTSYS;
1596 break;
1597 }
1598 p_seq = mdev->peer_seq;
1599 spin_unlock(&mdev->peer_seq_lock);
1600 timeout = schedule_timeout(30*HZ);
1601 spin_lock(&mdev->peer_seq_lock);
1602 if (timeout == 0 && p_seq == mdev->peer_seq) {
1603 ret = -ETIMEDOUT;
1604 dev_err(DEV, "ASSERT FAILED waited 30 seconds for sequence update, forcing reconnect\n");
1605 break;
1606 }
1607 }
1608 finish_wait(&mdev->seq_wait, &wait);
1609 if (mdev->peer_seq+1 == packet_seq)
1610 mdev->peer_seq++;
1611 spin_unlock(&mdev->peer_seq_lock);
1612 return ret;
1613}
1614
Lars Ellenberg688593c2010-11-17 22:25:03 +01001615/* see also bio_flags_to_wire()
1616 * DRBD_REQ_*, because we need to semantically map the flags to data packet
1617 * flags and back. We may replicate to other kernel versions. */
1618static unsigned long wire_flags_to_bio(struct drbd_conf *mdev, u32 dpf)
Philipp Reisner76d2e7e2010-08-25 11:58:05 +02001619{
Lars Ellenberg688593c2010-11-17 22:25:03 +01001620 return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) |
1621 (dpf & DP_FUA ? REQ_FUA : 0) |
1622 (dpf & DP_FLUSH ? REQ_FLUSH : 0) |
1623 (dpf & DP_DISCARD ? REQ_DISCARD : 0);
Philipp Reisner76d2e7e2010-08-25 11:58:05 +02001624}
1625
Philipp Reisnerb411b362009-09-25 16:07:19 -07001626/* mirrored write */
Philipp Reisner02918be2010-08-20 14:35:10 +02001627static int receive_Data(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
Philipp Reisnerb411b362009-09-25 16:07:19 -07001628{
1629 sector_t sector;
1630 struct drbd_epoch_entry *e;
Philipp Reisner02918be2010-08-20 14:35:10 +02001631 struct p_data *p = &mdev->data.rbuf.data;
Philipp Reisnerb411b362009-09-25 16:07:19 -07001632 int rw = WRITE;
1633 u32 dp_flags;
1634
Philipp Reisnerb411b362009-09-25 16:07:19 -07001635 if (!get_ldev(mdev)) {
1636 if (__ratelimit(&drbd_ratelimit_state))
1637 dev_err(DEV, "Can not write mirrored data block "
1638 "to local disk.\n");
1639 spin_lock(&mdev->peer_seq_lock);
1640 if (mdev->peer_seq+1 == be32_to_cpu(p->seq_num))
1641 mdev->peer_seq++;
1642 spin_unlock(&mdev->peer_seq_lock);
1643
Lars Ellenberg2b2bf212010-10-06 11:46:55 +02001644 drbd_send_ack_dp(mdev, P_NEG_ACK, p, data_size);
Philipp Reisnerb411b362009-09-25 16:07:19 -07001645 atomic_inc(&mdev->current_epoch->epoch_size);
1646 return drbd_drain_block(mdev, data_size);
1647 }
1648
1649 /* get_ldev(mdev) successful.
1650 * Corresponding put_ldev done either below (on various errors),
1651 * or in drbd_endio_write_sec, if we successfully submit the data at
1652 * the end of this function. */
1653
1654 sector = be64_to_cpu(p->sector);
1655 e = read_in_block(mdev, p->block_id, sector, data_size);
1656 if (!e) {
1657 put_ldev(mdev);
1658 return FALSE;
1659 }
1660
Philipp Reisnerb411b362009-09-25 16:07:19 -07001661 e->w.cb = e_end_block;
1662
Lars Ellenberg688593c2010-11-17 22:25:03 +01001663 dp_flags = be32_to_cpu(p->dp_flags);
1664 rw |= wire_flags_to_bio(mdev, dp_flags);
1665
1666 if (dp_flags & DP_MAY_SET_IN_SYNC)
1667 e->flags |= EE_MAY_SET_IN_SYNC;
1668
Philipp Reisnerb411b362009-09-25 16:07:19 -07001669 spin_lock(&mdev->epoch_lock);
1670 e->epoch = mdev->current_epoch;
1671 atomic_inc(&e->epoch->epoch_size);
1672 atomic_inc(&e->epoch->active);
Philipp Reisnerb411b362009-09-25 16:07:19 -07001673 spin_unlock(&mdev->epoch_lock);
1674
Philipp Reisnerb411b362009-09-25 16:07:19 -07001675 /* I'm the receiver, I do hold a net_cnt reference. */
1676 if (!mdev->net_conf->two_primaries) {
1677 spin_lock_irq(&mdev->req_lock);
1678 } else {
1679 /* don't get the req_lock yet,
1680 * we may sleep in drbd_wait_peer_seq */
1681 const int size = e->size;
1682 const int discard = test_bit(DISCARD_CONCURRENT, &mdev->flags);
1683 DEFINE_WAIT(wait);
1684 struct drbd_request *i;
1685 struct hlist_node *n;
1686 struct hlist_head *slot;
1687 int first;
1688
1689 D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C);
1690 BUG_ON(mdev->ee_hash == NULL);
1691 BUG_ON(mdev->tl_hash == NULL);
1692
1693 /* conflict detection and handling:
1694 * 1. wait on the sequence number,
1695 * in case this data packet overtook ACK packets.
1696 * 2. check our hash tables for conflicting requests.
1697 * we only need to walk the tl_hash, since an ee can not
1698 * have a conflict with an other ee: on the submitting
1699 * node, the corresponding req had already been conflicting,
1700 * and a conflicting req is never sent.
1701 *
1702 * Note: for two_primaries, we are protocol C,
1703 * so there cannot be any request that is DONE
1704 * but still on the transfer log.
1705 *
1706 * unconditionally add to the ee_hash.
1707 *
1708 * if no conflicting request is found:
1709 * submit.
1710 *
1711 * if any conflicting request is found
1712 * that has not yet been acked,
1713 * AND I have the "discard concurrent writes" flag:
1714 * queue (via done_ee) the P_DISCARD_ACK; OUT.
1715 *
1716 * if any conflicting request is found:
1717 * block the receiver, waiting on misc_wait
1718 * until no more conflicting requests are there,
1719 * or we get interrupted (disconnect).
1720 *
1721 * we do not just write after local io completion of those
1722 * requests, but only after req is done completely, i.e.
1723 * we wait for the P_DISCARD_ACK to arrive!
1724 *
1725 * then proceed normally, i.e. submit.
1726 */
1727 if (drbd_wait_peer_seq(mdev, be32_to_cpu(p->seq_num)))
1728 goto out_interrupted;
1729
1730 spin_lock_irq(&mdev->req_lock);
1731
1732 hlist_add_head(&e->colision, ee_hash_slot(mdev, sector));
1733
1734#define OVERLAPS overlaps(i->sector, i->size, sector, size)
1735 slot = tl_hash_slot(mdev, sector);
1736 first = 1;
1737 for (;;) {
1738 int have_unacked = 0;
1739 int have_conflict = 0;
1740 prepare_to_wait(&mdev->misc_wait, &wait,
1741 TASK_INTERRUPTIBLE);
1742 hlist_for_each_entry(i, n, slot, colision) {
1743 if (OVERLAPS) {
1744 /* only ALERT on first iteration,
1745 * we may be woken up early... */
1746 if (first)
1747 dev_alert(DEV, "%s[%u] Concurrent local write detected!"
1748 " new: %llus +%u; pending: %llus +%u\n",
1749 current->comm, current->pid,
1750 (unsigned long long)sector, size,
1751 (unsigned long long)i->sector, i->size);
1752 if (i->rq_state & RQ_NET_PENDING)
1753 ++have_unacked;
1754 ++have_conflict;
1755 }
1756 }
1757#undef OVERLAPS
1758 if (!have_conflict)
1759 break;
1760
1761 /* Discard Ack only for the _first_ iteration */
1762 if (first && discard && have_unacked) {
1763 dev_alert(DEV, "Concurrent write! [DISCARD BY FLAG] sec=%llus\n",
1764 (unsigned long long)sector);
1765 inc_unacked(mdev);
1766 e->w.cb = e_send_discard_ack;
1767 list_add_tail(&e->w.list, &mdev->done_ee);
1768
1769 spin_unlock_irq(&mdev->req_lock);
1770
1771 /* we could probably send that P_DISCARD_ACK ourselves,
1772 * but I don't like the receiver using the msock */
1773
1774 put_ldev(mdev);
1775 wake_asender(mdev);
1776 finish_wait(&mdev->misc_wait, &wait);
1777 return TRUE;
1778 }
1779
1780 if (signal_pending(current)) {
1781 hlist_del_init(&e->colision);
1782
1783 spin_unlock_irq(&mdev->req_lock);
1784
1785 finish_wait(&mdev->misc_wait, &wait);
1786 goto out_interrupted;
1787 }
1788
1789 spin_unlock_irq(&mdev->req_lock);
1790 if (first) {
1791 first = 0;
1792 dev_alert(DEV, "Concurrent write! [W AFTERWARDS] "
1793 "sec=%llus\n", (unsigned long long)sector);
1794 } else if (discard) {
1795 /* we had none on the first iteration.
1796 * there must be none now. */
1797 D_ASSERT(have_unacked == 0);
1798 }
1799 schedule();
1800 spin_lock_irq(&mdev->req_lock);
1801 }
1802 finish_wait(&mdev->misc_wait, &wait);
1803 }
1804
1805 list_add(&e->w.list, &mdev->active_ee);
1806 spin_unlock_irq(&mdev->req_lock);
1807
1808 switch (mdev->net_conf->wire_protocol) {
1809 case DRBD_PROT_C:
1810 inc_unacked(mdev);
1811 /* corresponding dec_unacked() in e_end_block()
1812 * respective _drbd_clear_done_ee */
1813 break;
1814 case DRBD_PROT_B:
1815 /* I really don't like it that the receiver thread
1816 * sends on the msock, but anyways */
1817 drbd_send_ack(mdev, P_RECV_ACK, e);
1818 break;
1819 case DRBD_PROT_A:
1820 /* nothing to do */
1821 break;
1822 }
1823
Lars Ellenberg6719fb02010-10-18 23:04:07 +02001824 if (mdev->state.pdsk < D_INCONSISTENT) {
Philipp Reisnerb411b362009-09-25 16:07:19 -07001825 /* In case we have the only disk of the cluster, */
1826 drbd_set_out_of_sync(mdev, e->sector, e->size);
1827 e->flags |= EE_CALL_AL_COMPLETE_IO;
Lars Ellenberg6719fb02010-10-18 23:04:07 +02001828 e->flags &= ~EE_MAY_SET_IN_SYNC;
Philipp Reisnerb411b362009-09-25 16:07:19 -07001829 drbd_al_begin_io(mdev, e->sector);
1830 }
1831
Lars Ellenberg45bb9122010-05-14 17:10:48 +02001832 if (drbd_submit_ee(mdev, e, rw, DRBD_FAULT_DT_WR) == 0)
1833 return TRUE;
Philipp Reisnerb411b362009-09-25 16:07:19 -07001834
Lars Ellenberg22cc37a2010-09-14 20:40:41 +02001835 /* drbd_submit_ee currently fails for one reason only:
1836 * not being able to allocate enough bios.
1837 * Is dropping the connection going to help? */
1838 spin_lock_irq(&mdev->req_lock);
1839 list_del(&e->w.list);
1840 hlist_del_init(&e->colision);
1841 spin_unlock_irq(&mdev->req_lock);
1842 if (e->flags & EE_CALL_AL_COMPLETE_IO)
1843 drbd_al_complete_io(mdev, e->sector);
1844
Philipp Reisnerb411b362009-09-25 16:07:19 -07001845out_interrupted:
1846 /* yes, the epoch_size now is imbalanced.
1847 * but we drop the connection anyways, so we don't have a chance to
1848 * receive a barrier... atomic_inc(&mdev->epoch_size); */
1849 put_ldev(mdev);
1850 drbd_free_ee(mdev, e);
1851 return FALSE;
1852}
1853
Lars Ellenberg0f0601f2010-08-11 23:40:24 +02001854/* We may throttle resync, if the lower device seems to be busy,
1855 * and current sync rate is above c_min_rate.
1856 *
1857 * To decide whether or not the lower device is busy, we use a scheme similar
1858 * to MD RAID is_mddev_idle(): if the partition stats reveal "significant"
1859 * (more than 64 sectors) of activity we cannot account for with our own resync
1860 * activity, it obviously is "busy".
1861 *
1862 * The current sync rate used here uses only the most recent two step marks,
1863 * to have a short time average so we can react faster.
1864 */
Philipp Reisnere3555d82010-11-07 15:56:29 +01001865int drbd_rs_should_slow_down(struct drbd_conf *mdev, sector_t sector)
Lars Ellenberg0f0601f2010-08-11 23:40:24 +02001866{
1867 struct gendisk *disk = mdev->ldev->backing_bdev->bd_contains->bd_disk;
1868 unsigned long db, dt, dbdt;
Philipp Reisnere3555d82010-11-07 15:56:29 +01001869 struct lc_element *tmp;
Lars Ellenberg0f0601f2010-08-11 23:40:24 +02001870 int curr_events;
1871 int throttle = 0;
1872
1873 /* feature disabled? */
1874 if (mdev->sync_conf.c_min_rate == 0)
1875 return 0;
1876
Philipp Reisnere3555d82010-11-07 15:56:29 +01001877 spin_lock_irq(&mdev->al_lock);
1878 tmp = lc_find(mdev->resync, BM_SECT_TO_EXT(sector));
1879 if (tmp) {
1880 struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce);
1881 if (test_bit(BME_PRIORITY, &bm_ext->flags)) {
1882 spin_unlock_irq(&mdev->al_lock);
1883 return 0;
1884 }
1885 /* Do not slow down if app IO is already waiting for this extent */
1886 }
1887 spin_unlock_irq(&mdev->al_lock);
1888
Lars Ellenberg0f0601f2010-08-11 23:40:24 +02001889 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
1890 (int)part_stat_read(&disk->part0, sectors[1]) -
1891 atomic_read(&mdev->rs_sect_ev);
Philipp Reisnere3555d82010-11-07 15:56:29 +01001892
Lars Ellenberg0f0601f2010-08-11 23:40:24 +02001893 if (!mdev->rs_last_events || curr_events - mdev->rs_last_events > 64) {
1894 unsigned long rs_left;
1895 int i;
1896
1897 mdev->rs_last_events = curr_events;
1898
1899 /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP,
1900 * approx. */
Lars Ellenberg2649f082010-11-05 10:05:47 +01001901 i = (mdev->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS;
1902
1903 if (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T)
1904 rs_left = mdev->ov_left;
1905 else
1906 rs_left = drbd_bm_total_weight(mdev) - mdev->rs_failed;
Lars Ellenberg0f0601f2010-08-11 23:40:24 +02001907
1908 dt = ((long)jiffies - (long)mdev->rs_mark_time[i]) / HZ;
1909 if (!dt)
1910 dt++;
1911 db = mdev->rs_mark_left[i] - rs_left;
1912 dbdt = Bit2KB(db/dt);
1913
1914 if (dbdt > mdev->sync_conf.c_min_rate)
1915 throttle = 1;
1916 }
1917 return throttle;
1918}
1919
1920
Philipp Reisner02918be2010-08-20 14:35:10 +02001921static int receive_DataRequest(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int digest_size)
Philipp Reisnerb411b362009-09-25 16:07:19 -07001922{
1923 sector_t sector;
1924 const sector_t capacity = drbd_get_capacity(mdev->this_bdev);
1925 struct drbd_epoch_entry *e;
1926 struct digest_info *di = NULL;
Philipp Reisnerb18b37b2010-10-13 15:32:44 +02001927 int size, verb;
Philipp Reisnerb411b362009-09-25 16:07:19 -07001928 unsigned int fault_type;
Philipp Reisner02918be2010-08-20 14:35:10 +02001929 struct p_block_req *p = &mdev->data.rbuf.block_req;
Philipp Reisnerb411b362009-09-25 16:07:19 -07001930
1931 sector = be64_to_cpu(p->sector);
1932 size = be32_to_cpu(p->blksize);
1933
Lars Ellenberg1816a2b2010-11-11 15:19:07 +01001934 if (size <= 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_BIO_SIZE) {
Philipp Reisnerb411b362009-09-25 16:07:19 -07001935 dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__,
1936 (unsigned long long)sector, size);
1937 return FALSE;
1938 }
1939 if (sector + (size>>9) > capacity) {
1940 dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__,
1941 (unsigned long long)sector, size);
1942 return FALSE;
1943 }
1944
1945 if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) {
Philipp Reisnerb18b37b2010-10-13 15:32:44 +02001946 verb = 1;
1947 switch (cmd) {
1948 case P_DATA_REQUEST:
1949 drbd_send_ack_rp(mdev, P_NEG_DREPLY, p);
1950 break;
1951 case P_RS_DATA_REQUEST:
1952 case P_CSUM_RS_REQUEST:
1953 case P_OV_REQUEST:
1954 drbd_send_ack_rp(mdev, P_NEG_RS_DREPLY , p);
1955 break;
1956 case P_OV_REPLY:
1957 verb = 0;
1958 dec_rs_pending(mdev);
1959 drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, ID_IN_SYNC);
1960 break;
1961 default:
1962 dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n",
1963 cmdname(cmd));
1964 }
1965 if (verb && __ratelimit(&drbd_ratelimit_state))
Philipp Reisnerb411b362009-09-25 16:07:19 -07001966 dev_err(DEV, "Can not satisfy peer's read request, "
1967 "no local data.\n");
Philipp Reisnerb18b37b2010-10-13 15:32:44 +02001968
Lars Ellenberga821cc42010-09-06 12:31:37 +02001969 /* drain possibly payload */
1970 return drbd_drain_block(mdev, digest_size);
Philipp Reisnerb411b362009-09-25 16:07:19 -07001971 }
1972
1973 /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD
1974 * "criss-cross" setup, that might cause write-out on some other DRBD,
1975 * which in turn might block on the other node at this very place. */
1976 e = drbd_alloc_ee(mdev, p->block_id, sector, size, GFP_NOIO);
1977 if (!e) {
1978 put_ldev(mdev);
1979 return FALSE;
1980 }
1981
Philipp Reisner02918be2010-08-20 14:35:10 +02001982 switch (cmd) {
Philipp Reisnerb411b362009-09-25 16:07:19 -07001983 case P_DATA_REQUEST:
1984 e->w.cb = w_e_end_data_req;
1985 fault_type = DRBD_FAULT_DT_RD;
Lars Ellenberg80a40e42010-08-11 23:28:00 +02001986 /* application IO, don't drbd_rs_begin_io */
1987 goto submit;
1988
Philipp Reisnerb411b362009-09-25 16:07:19 -07001989 case P_RS_DATA_REQUEST:
1990 e->w.cb = w_e_end_rsdata_req;
1991 fault_type = DRBD_FAULT_RS_RD;
Lars Ellenberg5f9915b2010-11-09 14:15:24 +01001992 /* used in the sector offset progress display */
1993 mdev->bm_resync_fo = BM_SECT_TO_BIT(sector);
Philipp Reisnerb411b362009-09-25 16:07:19 -07001994 break;
1995
1996 case P_OV_REPLY:
1997 case P_CSUM_RS_REQUEST:
1998 fault_type = DRBD_FAULT_RS_RD;
Philipp Reisnerb411b362009-09-25 16:07:19 -07001999 di = kmalloc(sizeof(*di) + digest_size, GFP_NOIO);
2000 if (!di)
2001 goto out_free_e;
2002
2003 di->digest_size = digest_size;
2004 di->digest = (((char *)di)+sizeof(struct digest_info));
2005
Lars Ellenbergc36c3ce2010-08-11 20:42:55 +02002006 e->digest = di;
2007 e->flags |= EE_HAS_DIGEST;
2008
Philipp Reisnerb411b362009-09-25 16:07:19 -07002009 if (drbd_recv(mdev, di->digest, digest_size) != digest_size)
2010 goto out_free_e;
2011
Philipp Reisner02918be2010-08-20 14:35:10 +02002012 if (cmd == P_CSUM_RS_REQUEST) {
Philipp Reisnerb411b362009-09-25 16:07:19 -07002013 D_ASSERT(mdev->agreed_pro_version >= 89);
2014 e->w.cb = w_e_end_csum_rs_req;
Lars Ellenberg5f9915b2010-11-09 14:15:24 +01002015 /* used in the sector offset progress display */
2016 mdev->bm_resync_fo = BM_SECT_TO_BIT(sector);
Philipp Reisner02918be2010-08-20 14:35:10 +02002017 } else if (cmd == P_OV_REPLY) {
Lars Ellenberg2649f082010-11-05 10:05:47 +01002018 /* track progress, we may need to throttle */
2019 atomic_add(size >> 9, &mdev->rs_sect_in);
Philipp Reisnerb411b362009-09-25 16:07:19 -07002020 e->w.cb = w_e_end_ov_reply;
2021 dec_rs_pending(mdev);
Lars Ellenberg0f0601f2010-08-11 23:40:24 +02002022 /* drbd_rs_begin_io done when we sent this request,
2023 * but accounting still needs to be done. */
2024 goto submit_for_resync;
Philipp Reisnerb411b362009-09-25 16:07:19 -07002025 }
2026 break;
2027
2028 case P_OV_REQUEST:
Philipp Reisnerb411b362009-09-25 16:07:19 -07002029 if (mdev->ov_start_sector == ~(sector_t)0 &&
2030 mdev->agreed_pro_version >= 90) {
Lars Ellenbergde228bb2010-11-05 09:43:15 +01002031 unsigned long now = jiffies;
2032 int i;
Philipp Reisnerb411b362009-09-25 16:07:19 -07002033 mdev->ov_start_sector = sector;
2034 mdev->ov_position = sector;
Lars Ellenberg30b743a2010-11-05 09:39:06 +01002035 mdev->ov_left = drbd_bm_bits(mdev) - BM_SECT_TO_BIT(sector);
2036 mdev->rs_total = mdev->ov_left;
Lars Ellenbergde228bb2010-11-05 09:43:15 +01002037 for (i = 0; i < DRBD_SYNC_MARKS; i++) {
2038 mdev->rs_mark_left[i] = mdev->ov_left;
2039 mdev->rs_mark_time[i] = now;
2040 }
Philipp Reisnerb411b362009-09-25 16:07:19 -07002041 dev_info(DEV, "Online Verify start sector: %llu\n",
2042 (unsigned long long)sector);
2043 }
2044 e->w.cb = w_e_end_ov_req;
2045 fault_type = DRBD_FAULT_RS_RD;
Philipp Reisnerb411b362009-09-25 16:07:19 -07002046 break;
2047
Philipp Reisnerb411b362009-09-25 16:07:19 -07002048 default:
2049 dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n",
Philipp Reisner02918be2010-08-20 14:35:10 +02002050 cmdname(cmd));
Philipp Reisnerb411b362009-09-25 16:07:19 -07002051 fault_type = DRBD_FAULT_MAX;
Lars Ellenberg80a40e42010-08-11 23:28:00 +02002052 goto out_free_e;
Philipp Reisnerb411b362009-09-25 16:07:19 -07002053 }
2054
Lars Ellenberg0f0601f2010-08-11 23:40:24 +02002055 /* Throttle, drbd_rs_begin_io and submit should become asynchronous
2056 * wrt the receiver, but it is not as straightforward as it may seem.
2057 * Various places in the resync start and stop logic assume resync
2058 * requests are processed in order, requeuing this on the worker thread
2059 * introduces a bunch of new code for synchronization between threads.
2060 *
2061 * Unlimited throttling before drbd_rs_begin_io may stall the resync
2062 * "forever", throttling after drbd_rs_begin_io will lock that extent
2063 * for application writes for the same time. For now, just throttle
2064 * here, where the rest of the code expects the receiver to sleep for
2065 * a while, anyways.
2066 */
Philipp Reisnerb411b362009-09-25 16:07:19 -07002067
Lars Ellenberg0f0601f2010-08-11 23:40:24 +02002068 /* Throttle before drbd_rs_begin_io, as that locks out application IO;
2069 * this defers syncer requests for some time, before letting at least
2070 * on request through. The resync controller on the receiving side
2071 * will adapt to the incoming rate accordingly.
2072 *
2073 * We cannot throttle here if remote is Primary/SyncTarget:
2074 * we would also throttle its application reads.
2075 * In that case, throttling is done on the SyncTarget only.
2076 */
Philipp Reisnere3555d82010-11-07 15:56:29 +01002077 if (mdev->state.peer != R_PRIMARY && drbd_rs_should_slow_down(mdev, sector))
2078 schedule_timeout_uninterruptible(HZ/10);
2079 if (drbd_rs_begin_io(mdev, sector))
Lars Ellenberg80a40e42010-08-11 23:28:00 +02002080 goto out_free_e;
Philipp Reisnerb411b362009-09-25 16:07:19 -07002081
Lars Ellenberg0f0601f2010-08-11 23:40:24 +02002082submit_for_resync:
2083 atomic_add(size >> 9, &mdev->rs_sect_ev);
2084
Lars Ellenberg80a40e42010-08-11 23:28:00 +02002085submit:
Philipp Reisnerb411b362009-09-25 16:07:19 -07002086 inc_unacked(mdev);
Lars Ellenberg80a40e42010-08-11 23:28:00 +02002087 spin_lock_irq(&mdev->req_lock);
2088 list_add_tail(&e->w.list, &mdev->read_ee);
2089 spin_unlock_irq(&mdev->req_lock);
Philipp Reisnerb411b362009-09-25 16:07:19 -07002090
Lars Ellenberg45bb9122010-05-14 17:10:48 +02002091 if (drbd_submit_ee(mdev, e, READ, fault_type) == 0)
2092 return TRUE;
Philipp Reisnerb411b362009-09-25 16:07:19 -07002093
Lars Ellenberg22cc37a2010-09-14 20:40:41 +02002094 /* drbd_submit_ee currently fails for one reason only:
2095 * not being able to allocate enough bios.
2096 * Is dropping the connection going to help? */
2097 spin_lock_irq(&mdev->req_lock);
2098 list_del(&e->w.list);
2099 spin_unlock_irq(&mdev->req_lock);
2100 /* no drbd_rs_complete_io(), we are dropping the connection anyways */
2101
Philipp Reisnerb411b362009-09-25 16:07:19 -07002102out_free_e:
Philipp Reisnerb411b362009-09-25 16:07:19 -07002103 put_ldev(mdev);
2104 drbd_free_ee(mdev, e);
2105 return FALSE;
2106}
2107
2108static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local)
2109{
2110 int self, peer, rv = -100;
2111 unsigned long ch_self, ch_peer;
2112
2113 self = mdev->ldev->md.uuid[UI_BITMAP] & 1;
2114 peer = mdev->p_uuid[UI_BITMAP] & 1;
2115
2116 ch_peer = mdev->p_uuid[UI_SIZE];
2117 ch_self = mdev->comm_bm_set;
2118
2119 switch (mdev->net_conf->after_sb_0p) {
2120 case ASB_CONSENSUS:
2121 case ASB_DISCARD_SECONDARY:
2122 case ASB_CALL_HELPER:
2123 dev_err(DEV, "Configuration error.\n");
2124 break;
2125 case ASB_DISCONNECT:
2126 break;
2127 case ASB_DISCARD_YOUNGER_PRI:
2128 if (self == 0 && peer == 1) {
2129 rv = -1;
2130 break;
2131 }
2132 if (self == 1 && peer == 0) {
2133 rv = 1;
2134 break;
2135 }
2136 /* Else fall through to one of the other strategies... */
2137 case ASB_DISCARD_OLDER_PRI:
2138 if (self == 0 && peer == 1) {
2139 rv = 1;
2140 break;
2141 }
2142 if (self == 1 && peer == 0) {
2143 rv = -1;
2144 break;
2145 }
2146 /* Else fall through to one of the other strategies... */
Lars Ellenbergad19bf62009-10-14 09:36:49 +02002147 dev_warn(DEV, "Discard younger/older primary did not find a decision\n"
Philipp Reisnerb411b362009-09-25 16:07:19 -07002148 "Using discard-least-changes instead\n");
2149 case ASB_DISCARD_ZERO_CHG:
2150 if (ch_peer == 0 && ch_self == 0) {
2151 rv = test_bit(DISCARD_CONCURRENT, &mdev->flags)
2152 ? -1 : 1;
2153 break;
2154 } else {
2155 if (ch_peer == 0) { rv = 1; break; }
2156 if (ch_self == 0) { rv = -1; break; }
2157 }
2158 if (mdev->net_conf->after_sb_0p == ASB_DISCARD_ZERO_CHG)
2159 break;
2160 case ASB_DISCARD_LEAST_CHG:
2161 if (ch_self < ch_peer)
2162 rv = -1;
2163 else if (ch_self > ch_peer)
2164 rv = 1;
2165 else /* ( ch_self == ch_peer ) */
2166 /* Well, then use something else. */
2167 rv = test_bit(DISCARD_CONCURRENT, &mdev->flags)
2168 ? -1 : 1;
2169 break;
2170 case ASB_DISCARD_LOCAL:
2171 rv = -1;
2172 break;
2173 case ASB_DISCARD_REMOTE:
2174 rv = 1;
2175 }
2176
2177 return rv;
2178}
2179
2180static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local)
2181{
2182 int self, peer, hg, rv = -100;
2183
2184 self = mdev->ldev->md.uuid[UI_BITMAP] & 1;
2185 peer = mdev->p_uuid[UI_BITMAP] & 1;
2186
2187 switch (mdev->net_conf->after_sb_1p) {
2188 case ASB_DISCARD_YOUNGER_PRI:
2189 case ASB_DISCARD_OLDER_PRI:
2190 case ASB_DISCARD_LEAST_CHG:
2191 case ASB_DISCARD_LOCAL:
2192 case ASB_DISCARD_REMOTE:
2193 dev_err(DEV, "Configuration error.\n");
2194 break;
2195 case ASB_DISCONNECT:
2196 break;
2197 case ASB_CONSENSUS:
2198 hg = drbd_asb_recover_0p(mdev);
2199 if (hg == -1 && mdev->state.role == R_SECONDARY)
2200 rv = hg;
2201 if (hg == 1 && mdev->state.role == R_PRIMARY)
2202 rv = hg;
2203 break;
2204 case ASB_VIOLENTLY:
2205 rv = drbd_asb_recover_0p(mdev);
2206 break;
2207 case ASB_DISCARD_SECONDARY:
2208 return mdev->state.role == R_PRIMARY ? 1 : -1;
2209 case ASB_CALL_HELPER:
2210 hg = drbd_asb_recover_0p(mdev);
2211 if (hg == -1 && mdev->state.role == R_PRIMARY) {
2212 self = drbd_set_role(mdev, R_SECONDARY, 0);
2213 /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE,
2214 * we might be here in C_WF_REPORT_PARAMS which is transient.
2215 * we do not need to wait for the after state change work either. */
2216 self = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY));
2217 if (self != SS_SUCCESS) {
2218 drbd_khelper(mdev, "pri-lost-after-sb");
2219 } else {
2220 dev_warn(DEV, "Successfully gave up primary role.\n");
2221 rv = hg;
2222 }
2223 } else
2224 rv = hg;
2225 }
2226
2227 return rv;
2228}
2229
2230static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local)
2231{
2232 int self, peer, hg, rv = -100;
2233
2234 self = mdev->ldev->md.uuid[UI_BITMAP] & 1;
2235 peer = mdev->p_uuid[UI_BITMAP] & 1;
2236
2237 switch (mdev->net_conf->after_sb_2p) {
2238 case ASB_DISCARD_YOUNGER_PRI:
2239 case ASB_DISCARD_OLDER_PRI:
2240 case ASB_DISCARD_LEAST_CHG:
2241 case ASB_DISCARD_LOCAL:
2242 case ASB_DISCARD_REMOTE:
2243 case ASB_CONSENSUS:
2244 case ASB_DISCARD_SECONDARY:
2245 dev_err(DEV, "Configuration error.\n");
2246 break;
2247 case ASB_VIOLENTLY:
2248 rv = drbd_asb_recover_0p(mdev);
2249 break;
2250 case ASB_DISCONNECT:
2251 break;
2252 case ASB_CALL_HELPER:
2253 hg = drbd_asb_recover_0p(mdev);
2254 if (hg == -1) {
2255 /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE,
2256 * we might be here in C_WF_REPORT_PARAMS which is transient.
2257 * we do not need to wait for the after state change work either. */
2258 self = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY));
2259 if (self != SS_SUCCESS) {
2260 drbd_khelper(mdev, "pri-lost-after-sb");
2261 } else {
2262 dev_warn(DEV, "Successfully gave up primary role.\n");
2263 rv = hg;
2264 }
2265 } else
2266 rv = hg;
2267 }
2268
2269 return rv;
2270}
2271
2272static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid,
2273 u64 bits, u64 flags)
2274{
2275 if (!uuid) {
2276 dev_info(DEV, "%s uuid info vanished while I was looking!\n", text);
2277 return;
2278 }
2279 dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n",
2280 text,
2281 (unsigned long long)uuid[UI_CURRENT],
2282 (unsigned long long)uuid[UI_BITMAP],
2283 (unsigned long long)uuid[UI_HISTORY_START],
2284 (unsigned long long)uuid[UI_HISTORY_END],
2285 (unsigned long long)bits,
2286 (unsigned long long)flags);
2287}
2288
2289/*
2290 100 after split brain try auto recover
2291 2 C_SYNC_SOURCE set BitMap
2292 1 C_SYNC_SOURCE use BitMap
2293 0 no Sync
2294 -1 C_SYNC_TARGET use BitMap
2295 -2 C_SYNC_TARGET set BitMap
2296 -100 after split brain, disconnect
2297-1000 unrelated data
2298 */
2299static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local)
2300{
2301 u64 self, peer;
2302 int i, j;
2303
2304 self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1);
2305 peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1);
2306
2307 *rule_nr = 10;
2308 if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED)
2309 return 0;
2310
2311 *rule_nr = 20;
2312 if ((self == UUID_JUST_CREATED || self == (u64)0) &&
2313 peer != UUID_JUST_CREATED)
2314 return -2;
2315
2316 *rule_nr = 30;
2317 if (self != UUID_JUST_CREATED &&
2318 (peer == UUID_JUST_CREATED || peer == (u64)0))
2319 return 2;
2320
2321 if (self == peer) {
2322 int rct, dc; /* roles at crash time */
2323
2324 if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) {
2325
2326 if (mdev->agreed_pro_version < 91)
2327 return -1001;
2328
2329 if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) &&
2330 (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) {
2331 dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n");
2332 drbd_uuid_set_bm(mdev, 0UL);
2333
2334 drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid,
2335 mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0);
2336 *rule_nr = 34;
2337 } else {
2338 dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n");
2339 *rule_nr = 36;
2340 }
2341
2342 return 1;
2343 }
2344
2345 if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) {
2346
2347 if (mdev->agreed_pro_version < 91)
2348 return -1001;
2349
2350 if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) &&
2351 (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) {
2352 dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n");
2353
2354 mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START];
2355 mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP];
2356 mdev->p_uuid[UI_BITMAP] = 0UL;
2357
2358 drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]);
2359 *rule_nr = 35;
2360 } else {
2361 dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n");
2362 *rule_nr = 37;
2363 }
2364
2365 return -1;
2366 }
2367
2368 /* Common power [off|failure] */
2369 rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) +
2370 (mdev->p_uuid[UI_FLAGS] & 2);
2371 /* lowest bit is set when we were primary,
2372 * next bit (weight 2) is set when peer was primary */
2373 *rule_nr = 40;
2374
2375 switch (rct) {
2376 case 0: /* !self_pri && !peer_pri */ return 0;
2377 case 1: /* self_pri && !peer_pri */ return 1;
2378 case 2: /* !self_pri && peer_pri */ return -1;
2379 case 3: /* self_pri && peer_pri */
2380 dc = test_bit(DISCARD_CONCURRENT, &mdev->flags);
2381 return dc ? -1 : 1;
2382 }
2383 }
2384
2385 *rule_nr = 50;
2386 peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1);
2387 if (self == peer)
2388 return -1;
2389
2390 *rule_nr = 51;
2391 peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1);
2392 if (self == peer) {
2393 self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1);
2394 peer = mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1);
2395 if (self == peer) {
2396 /* The last P_SYNC_UUID did not get though. Undo the last start of
2397 resync as sync source modifications of the peer's UUIDs. */
2398
2399 if (mdev->agreed_pro_version < 91)
2400 return -1001;
2401
2402 mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START];
2403 mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1];
2404 return -1;
2405 }
2406 }
2407
2408 *rule_nr = 60;
2409 self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1);
2410 for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) {
2411 peer = mdev->p_uuid[i] & ~((u64)1);
2412 if (self == peer)
2413 return -2;
2414 }
2415
2416 *rule_nr = 70;
2417 self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1);
2418 peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1);
2419 if (self == peer)
2420 return 1;
2421
2422 *rule_nr = 71;
2423 self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1);
2424 if (self == peer) {
2425 self = mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1);
2426 peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1);
2427 if (self == peer) {
2428 /* The last P_SYNC_UUID did not get though. Undo the last start of
2429 resync as sync source modifications of our UUIDs. */
2430
2431 if (mdev->agreed_pro_version < 91)
2432 return -1001;
2433
2434 _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]);
2435 _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]);
2436
2437 dev_info(DEV, "Undid last start of resync:\n");
2438
2439 drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid,
2440 mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0);
2441
2442 return 1;
2443 }
2444 }
2445
2446
2447 *rule_nr = 80;
Philipp Reisnerd8c2a362009-11-18 15:52:51 +01002448 peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1);
Philipp Reisnerb411b362009-09-25 16:07:19 -07002449 for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) {
2450 self = mdev->ldev->md.uuid[i] & ~((u64)1);
2451 if (self == peer)
2452 return 2;
2453 }
2454
2455 *rule_nr = 90;
2456 self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1);
2457 peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1);
2458 if (self == peer && self != ((u64)0))
2459 return 100;
2460
2461 *rule_nr = 100;
2462 for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) {
2463 self = mdev->ldev->md.uuid[i] & ~((u64)1);
2464 for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) {
2465 peer = mdev->p_uuid[j] & ~((u64)1);
2466 if (self == peer)
2467 return -100;
2468 }
2469 }
2470
2471 return -1000;
2472}
2473
2474/* drbd_sync_handshake() returns the new conn state on success, or
2475 CONN_MASK (-1) on failure.
2476 */
2477static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role,
2478 enum drbd_disk_state peer_disk) __must_hold(local)
2479{
2480 int hg, rule_nr;
2481 enum drbd_conns rv = C_MASK;
2482 enum drbd_disk_state mydisk;
2483
2484 mydisk = mdev->state.disk;
2485 if (mydisk == D_NEGOTIATING)
2486 mydisk = mdev->new_state_tmp.disk;
2487
2488 dev_info(DEV, "drbd_sync_handshake:\n");
2489 drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0);
2490 drbd_uuid_dump(mdev, "peer", mdev->p_uuid,
2491 mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]);
2492
2493 hg = drbd_uuid_compare(mdev, &rule_nr);
2494
2495 dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr);
2496
2497 if (hg == -1000) {
2498 dev_alert(DEV, "Unrelated data, aborting!\n");
2499 return C_MASK;
2500 }
2501 if (hg == -1001) {
Lars Ellenberg220df4d2010-12-09 15:21:02 +01002502 dev_alert(DEV, "To resolve this both sides have to support at least protocol 91\n");
Philipp Reisnerb411b362009-09-25 16:07:19 -07002503 return C_MASK;
2504 }
2505
2506 if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) ||
2507 (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) {
2508 int f = (hg == -100) || abs(hg) == 2;
2509 hg = mydisk > D_INCONSISTENT ? 1 : -1;
2510 if (f)
2511 hg = hg*2;
2512 dev_info(DEV, "Becoming sync %s due to disk states.\n",
2513 hg > 0 ? "source" : "target");
2514 }
2515
Adam Gandelman3a11a482010-04-08 16:48:23 -07002516 if (abs(hg) == 100)
2517 drbd_khelper(mdev, "initial-split-brain");
2518
Philipp Reisnerb411b362009-09-25 16:07:19 -07002519 if (hg == 100 || (hg == -100 && mdev->net_conf->always_asbp)) {
2520 int pcount = (mdev->state.role == R_PRIMARY)
2521 + (peer_role == R_PRIMARY);
2522 int forced = (hg == -100);
2523
2524 switch (pcount) {
2525 case 0:
2526 hg = drbd_asb_recover_0p(mdev);
2527 break;
2528 case 1:
2529 hg = drbd_asb_recover_1p(mdev);
2530 break;
2531 case 2:
2532 hg = drbd_asb_recover_2p(mdev);
2533 break;
2534 }
2535 if (abs(hg) < 100) {
2536 dev_warn(DEV, "Split-Brain detected, %d primaries, "
2537 "automatically solved. Sync from %s node\n",
2538 pcount, (hg < 0) ? "peer" : "this");
2539 if (forced) {
2540 dev_warn(DEV, "Doing a full sync, since"
2541 " UUIDs where ambiguous.\n");
2542 hg = hg*2;
2543 }
2544 }
2545 }
2546
2547 if (hg == -100) {
2548 if (mdev->net_conf->want_lose && !(mdev->p_uuid[UI_FLAGS]&1))
2549 hg = -1;
2550 if (!mdev->net_conf->want_lose && (mdev->p_uuid[UI_FLAGS]&1))
2551 hg = 1;
2552
2553 if (abs(hg) < 100)
2554 dev_warn(DEV, "Split-Brain detected, manually solved. "
2555 "Sync from %s node\n",
2556 (hg < 0) ? "peer" : "this");
2557 }
2558
2559 if (hg == -100) {
Lars Ellenberg580b9762010-02-26 23:15:23 +01002560 /* FIXME this log message is not correct if we end up here
2561 * after an attempted attach on a diskless node.
2562 * We just refuse to attach -- well, we drop the "connection"
2563 * to that disk, in a way... */
Adam Gandelman3a11a482010-04-08 16:48:23 -07002564 dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n");
Philipp Reisnerb411b362009-09-25 16:07:19 -07002565 drbd_khelper(mdev, "split-brain");
2566 return C_MASK;
2567 }
2568
2569 if (hg > 0 && mydisk <= D_INCONSISTENT) {
2570 dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n");
2571 return C_MASK;
2572 }
2573
2574 if (hg < 0 && /* by intention we do not use mydisk here. */
2575 mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) {
2576 switch (mdev->net_conf->rr_conflict) {
2577 case ASB_CALL_HELPER:
2578 drbd_khelper(mdev, "pri-lost");
2579 /* fall through */
2580 case ASB_DISCONNECT:
2581 dev_err(DEV, "I shall become SyncTarget, but I am primary!\n");
2582 return C_MASK;
2583 case ASB_VIOLENTLY:
2584 dev_warn(DEV, "Becoming SyncTarget, violating the stable-data"
2585 "assumption\n");
2586 }
2587 }
2588
Philipp Reisnercf14c2e2010-02-02 21:03:50 +01002589 if (mdev->net_conf->dry_run || test_bit(CONN_DRY_RUN, &mdev->flags)) {
2590 if (hg == 0)
2591 dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n");
2592 else
2593 dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.",
2594 drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET),
2595 abs(hg) >= 2 ? "full" : "bit-map based");
2596 return C_MASK;
2597 }
2598
Philipp Reisnerb411b362009-09-25 16:07:19 -07002599 if (abs(hg) >= 2) {
2600 dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n");
2601 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake"))
2602 return C_MASK;
2603 }
2604
2605 if (hg > 0) { /* become sync source. */
2606 rv = C_WF_BITMAP_S;
2607 } else if (hg < 0) { /* become sync target */
2608 rv = C_WF_BITMAP_T;
2609 } else {
2610 rv = C_CONNECTED;
2611 if (drbd_bm_total_weight(mdev)) {
2612 dev_info(DEV, "No resync, but %lu bits in bitmap!\n",
2613 drbd_bm_total_weight(mdev));
2614 }
2615 }
2616
2617 return rv;
2618}
2619
2620/* returns 1 if invalid */
2621static int cmp_after_sb(enum drbd_after_sb_p peer, enum drbd_after_sb_p self)
2622{
2623 /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */
2624 if ((peer == ASB_DISCARD_REMOTE && self == ASB_DISCARD_LOCAL) ||
2625 (self == ASB_DISCARD_REMOTE && peer == ASB_DISCARD_LOCAL))
2626 return 0;
2627
2628 /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */
2629 if (peer == ASB_DISCARD_REMOTE || peer == ASB_DISCARD_LOCAL ||
2630 self == ASB_DISCARD_REMOTE || self == ASB_DISCARD_LOCAL)
2631 return 1;
2632
2633 /* everything else is valid if they are equal on both sides. */
2634 if (peer == self)
2635 return 0;
2636
2637 /* everything es is invalid. */
2638 return 1;
2639}
2640
Philipp Reisner02918be2010-08-20 14:35:10 +02002641static int receive_protocol(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
Philipp Reisnerb411b362009-09-25 16:07:19 -07002642{
Philipp Reisner02918be2010-08-20 14:35:10 +02002643 struct p_protocol *p = &mdev->data.rbuf.protocol;
Philipp Reisnerb411b362009-09-25 16:07:19 -07002644 int p_proto, p_after_sb_0p, p_after_sb_1p, p_after_sb_2p;
Philipp Reisnercf14c2e2010-02-02 21:03:50 +01002645 int p_want_lose, p_two_primaries, cf;
Philipp Reisnerb411b362009-09-25 16:07:19 -07002646 char p_integrity_alg[SHARED_SECRET_MAX] = "";
2647
Philipp Reisnerb411b362009-09-25 16:07:19 -07002648 p_proto = be32_to_cpu(p->protocol);
2649 p_after_sb_0p = be32_to_cpu(p->after_sb_0p);
2650 p_after_sb_1p = be32_to_cpu(p->after_sb_1p);
2651 p_after_sb_2p = be32_to_cpu(p->after_sb_2p);
Philipp Reisnerb411b362009-09-25 16:07:19 -07002652 p_two_primaries = be32_to_cpu(p->two_primaries);
Philipp Reisnercf14c2e2010-02-02 21:03:50 +01002653 cf = be32_to_cpu(p->conn_flags);
2654 p_want_lose = cf & CF_WANT_LOSE;
2655
2656 clear_bit(CONN_DRY_RUN, &mdev->flags);
2657
2658 if (cf & CF_DRY_RUN)
2659 set_bit(CONN_DRY_RUN, &mdev->flags);
Philipp Reisnerb411b362009-09-25 16:07:19 -07002660
2661 if (p_proto != mdev->net_conf->wire_protocol) {
2662 dev_err(DEV, "incompatible communication protocols\n");
2663 goto disconnect;
2664 }
2665
2666 if (cmp_after_sb(p_after_sb_0p, mdev->net_conf->after_sb_0p)) {
2667 dev_err(DEV, "incompatible after-sb-0pri settings\n");
2668 goto disconnect;
2669 }
2670
2671 if (cmp_after_sb(p_after_sb_1p, mdev->net_conf->after_sb_1p)) {
2672 dev_err(DEV, "incompatible after-sb-1pri settings\n");
2673 goto disconnect;
2674 }
2675
2676 if (cmp_after_sb(p_after_sb_2p, mdev->net_conf->after_sb_2p)) {
2677 dev_err(DEV, "incompatible after-sb-2pri settings\n");
2678 goto disconnect;
2679 }
2680
2681 if (p_want_lose && mdev->net_conf->want_lose) {
2682 dev_err(DEV, "both sides have the 'want_lose' flag set\n");
2683 goto disconnect;
2684 }
2685
2686 if (p_two_primaries != mdev->net_conf->two_primaries) {
2687 dev_err(DEV, "incompatible setting of the two-primaries options\n");
2688 goto disconnect;
2689 }
2690
2691 if (mdev->agreed_pro_version >= 87) {
2692 unsigned char *my_alg = mdev->net_conf->integrity_alg;
2693
2694 if (drbd_recv(mdev, p_integrity_alg, data_size) != data_size)
2695 return FALSE;
2696
2697 p_integrity_alg[SHARED_SECRET_MAX-1] = 0;
2698 if (strcmp(p_integrity_alg, my_alg)) {
2699 dev_err(DEV, "incompatible setting of the data-integrity-alg\n");
2700 goto disconnect;
2701 }
2702 dev_info(DEV, "data-integrity-alg: %s\n",
2703 my_alg[0] ? my_alg : (unsigned char *)"<not-used>");
2704 }
2705
2706 return TRUE;
2707
2708disconnect:
2709 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
2710 return FALSE;
2711}
2712
2713/* helper function
2714 * input: alg name, feature name
2715 * return: NULL (alg name was "")
2716 * ERR_PTR(error) if something goes wrong
2717 * or the crypto hash ptr, if it worked out ok. */
2718struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev,
2719 const char *alg, const char *name)
2720{
2721 struct crypto_hash *tfm;
2722
2723 if (!alg[0])
2724 return NULL;
2725
2726 tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC);
2727 if (IS_ERR(tfm)) {
2728 dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n",
2729 alg, name, PTR_ERR(tfm));
2730 return tfm;
2731 }
2732 if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) {
2733 crypto_free_hash(tfm);
2734 dev_err(DEV, "\"%s\" is not a digest (%s)\n", alg, name);
2735 return ERR_PTR(-EINVAL);
2736 }
2737 return tfm;
2738}
2739
Philipp Reisner02918be2010-08-20 14:35:10 +02002740static int receive_SyncParam(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int packet_size)
Philipp Reisnerb411b362009-09-25 16:07:19 -07002741{
2742 int ok = TRUE;
Philipp Reisner02918be2010-08-20 14:35:10 +02002743 struct p_rs_param_95 *p = &mdev->data.rbuf.rs_param_95;
Philipp Reisnerb411b362009-09-25 16:07:19 -07002744 unsigned int header_size, data_size, exp_max_sz;
2745 struct crypto_hash *verify_tfm = NULL;
2746 struct crypto_hash *csums_tfm = NULL;
2747 const int apv = mdev->agreed_pro_version;
Philipp Reisner778f2712010-07-06 11:14:00 +02002748 int *rs_plan_s = NULL;
2749 int fifo_size = 0;
Philipp Reisnerb411b362009-09-25 16:07:19 -07002750
2751 exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param)
2752 : apv == 88 ? sizeof(struct p_rs_param)
2753 + SHARED_SECRET_MAX
Philipp Reisner8e26f9c2010-07-06 17:25:54 +02002754 : apv <= 94 ? sizeof(struct p_rs_param_89)
2755 : /* apv >= 95 */ sizeof(struct p_rs_param_95);
Philipp Reisnerb411b362009-09-25 16:07:19 -07002756
Philipp Reisner02918be2010-08-20 14:35:10 +02002757 if (packet_size > exp_max_sz) {
Philipp Reisnerb411b362009-09-25 16:07:19 -07002758 dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n",
Philipp Reisner02918be2010-08-20 14:35:10 +02002759 packet_size, exp_max_sz);
Philipp Reisnerb411b362009-09-25 16:07:19 -07002760 return FALSE;
2761 }
2762
2763 if (apv <= 88) {
Philipp Reisner02918be2010-08-20 14:35:10 +02002764 header_size = sizeof(struct p_rs_param) - sizeof(struct p_header80);
2765 data_size = packet_size - header_size;
Philipp Reisner8e26f9c2010-07-06 17:25:54 +02002766 } else if (apv <= 94) {
Philipp Reisner02918be2010-08-20 14:35:10 +02002767 header_size = sizeof(struct p_rs_param_89) - sizeof(struct p_header80);
2768 data_size = packet_size - header_size;
Philipp Reisnerb411b362009-09-25 16:07:19 -07002769 D_ASSERT(data_size == 0);
Philipp Reisner8e26f9c2010-07-06 17:25:54 +02002770 } else {
Philipp Reisner02918be2010-08-20 14:35:10 +02002771 header_size = sizeof(struct p_rs_param_95) - sizeof(struct p_header80);
2772 data_size = packet_size - header_size;
Philipp Reisnerb411b362009-09-25 16:07:19 -07002773 D_ASSERT(data_size == 0);
2774 }
2775
2776 /* initialize verify_alg and csums_alg */
2777 memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX);
2778
Philipp Reisner02918be2010-08-20 14:35:10 +02002779 if (drbd_recv(mdev, &p->head.payload, header_size) != header_size)
Philipp Reisnerb411b362009-09-25 16:07:19 -07002780 return FALSE;
2781
2782 mdev->sync_conf.rate = be32_to_cpu(p->rate);
2783
2784 if (apv >= 88) {
2785 if (apv == 88) {
2786 if (data_size > SHARED_SECRET_MAX) {
2787 dev_err(DEV, "verify-alg too long, "
2788 "peer wants %u, accepting only %u byte\n",
2789 data_size, SHARED_SECRET_MAX);
2790 return FALSE;
2791 }
2792
2793 if (drbd_recv(mdev, p->verify_alg, data_size) != data_size)
2794 return FALSE;
2795
2796 /* we expect NUL terminated string */
2797 /* but just in case someone tries to be evil */
2798 D_ASSERT(p->verify_alg[data_size-1] == 0);
2799 p->verify_alg[data_size-1] = 0;
2800
2801 } else /* apv >= 89 */ {
2802 /* we still expect NUL terminated strings */
2803 /* but just in case someone tries to be evil */
2804 D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0);
2805 D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0);
2806 p->verify_alg[SHARED_SECRET_MAX-1] = 0;
2807 p->csums_alg[SHARED_SECRET_MAX-1] = 0;
2808 }
2809
2810 if (strcmp(mdev->sync_conf.verify_alg, p->verify_alg)) {
2811 if (mdev->state.conn == C_WF_REPORT_PARAMS) {
2812 dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n",
2813 mdev->sync_conf.verify_alg, p->verify_alg);
2814 goto disconnect;
2815 }
2816 verify_tfm = drbd_crypto_alloc_digest_safe(mdev,
2817 p->verify_alg, "verify-alg");
2818 if (IS_ERR(verify_tfm)) {
2819 verify_tfm = NULL;
2820 goto disconnect;
2821 }
2822 }
2823
2824 if (apv >= 89 && strcmp(mdev->sync_conf.csums_alg, p->csums_alg)) {
2825 if (mdev->state.conn == C_WF_REPORT_PARAMS) {
2826 dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n",
2827 mdev->sync_conf.csums_alg, p->csums_alg);
2828 goto disconnect;
2829 }
2830 csums_tfm = drbd_crypto_alloc_digest_safe(mdev,
2831 p->csums_alg, "csums-alg");
2832 if (IS_ERR(csums_tfm)) {
2833 csums_tfm = NULL;
2834 goto disconnect;
2835 }
2836 }
2837
Philipp Reisner8e26f9c2010-07-06 17:25:54 +02002838 if (apv > 94) {
2839 mdev->sync_conf.rate = be32_to_cpu(p->rate);
2840 mdev->sync_conf.c_plan_ahead = be32_to_cpu(p->c_plan_ahead);
2841 mdev->sync_conf.c_delay_target = be32_to_cpu(p->c_delay_target);
2842 mdev->sync_conf.c_fill_target = be32_to_cpu(p->c_fill_target);
2843 mdev->sync_conf.c_max_rate = be32_to_cpu(p->c_max_rate);
Philipp Reisner778f2712010-07-06 11:14:00 +02002844
2845 fifo_size = (mdev->sync_conf.c_plan_ahead * 10 * SLEEP_TIME) / HZ;
2846 if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) {
2847 rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL);
2848 if (!rs_plan_s) {
2849 dev_err(DEV, "kmalloc of fifo_buffer failed");
2850 goto disconnect;
2851 }
2852 }
Philipp Reisner8e26f9c2010-07-06 17:25:54 +02002853 }
Philipp Reisnerb411b362009-09-25 16:07:19 -07002854
2855 spin_lock(&mdev->peer_seq_lock);
2856 /* lock against drbd_nl_syncer_conf() */
2857 if (verify_tfm) {
2858 strcpy(mdev->sync_conf.verify_alg, p->verify_alg);
2859 mdev->sync_conf.verify_alg_len = strlen(p->verify_alg) + 1;
2860 crypto_free_hash(mdev->verify_tfm);
2861 mdev->verify_tfm = verify_tfm;
2862 dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg);
2863 }
2864 if (csums_tfm) {
2865 strcpy(mdev->sync_conf.csums_alg, p->csums_alg);
2866 mdev->sync_conf.csums_alg_len = strlen(p->csums_alg) + 1;
2867 crypto_free_hash(mdev->csums_tfm);
2868 mdev->csums_tfm = csums_tfm;
2869 dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg);
2870 }
Philipp Reisner778f2712010-07-06 11:14:00 +02002871 if (fifo_size != mdev->rs_plan_s.size) {
2872 kfree(mdev->rs_plan_s.values);
2873 mdev->rs_plan_s.values = rs_plan_s;
2874 mdev->rs_plan_s.size = fifo_size;
2875 mdev->rs_planed = 0;
2876 }
Philipp Reisnerb411b362009-09-25 16:07:19 -07002877 spin_unlock(&mdev->peer_seq_lock);
2878 }
2879
2880 return ok;
2881disconnect:
2882 /* just for completeness: actually not needed,
2883 * as this is not reached if csums_tfm was ok. */
2884 crypto_free_hash(csums_tfm);
2885 /* but free the verify_tfm again, if csums_tfm did not work out */
2886 crypto_free_hash(verify_tfm);
2887 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
2888 return FALSE;
2889}
2890
2891static void drbd_setup_order_type(struct drbd_conf *mdev, int peer)
2892{
2893 /* sorry, we currently have no working implementation
2894 * of distributed TCQ */
2895}
2896
2897/* warn if the arguments differ by more than 12.5% */
2898static void warn_if_differ_considerably(struct drbd_conf *mdev,
2899 const char *s, sector_t a, sector_t b)
2900{
2901 sector_t d;
2902 if (a == 0 || b == 0)
2903 return;
2904 d = (a > b) ? (a - b) : (b - a);
2905 if (d > (a>>3) || d > (b>>3))
2906 dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s,
2907 (unsigned long long)a, (unsigned long long)b);
2908}
2909
Philipp Reisner02918be2010-08-20 14:35:10 +02002910static int receive_sizes(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
Philipp Reisnerb411b362009-09-25 16:07:19 -07002911{
Philipp Reisner02918be2010-08-20 14:35:10 +02002912 struct p_sizes *p = &mdev->data.rbuf.sizes;
Philipp Reisnerb411b362009-09-25 16:07:19 -07002913 enum determine_dev_size dd = unchanged;
Lars Ellenberg1816a2b2010-11-11 15:19:07 +01002914 unsigned int max_bio_size;
Philipp Reisnerb411b362009-09-25 16:07:19 -07002915 sector_t p_size, p_usize, my_usize;
2916 int ldsc = 0; /* local disk size changed */
Philipp Reisnere89b5912010-03-24 17:11:33 +01002917 enum dds_flags ddsf;
Philipp Reisnerb411b362009-09-25 16:07:19 -07002918
Philipp Reisnerb411b362009-09-25 16:07:19 -07002919 p_size = be64_to_cpu(p->d_size);
2920 p_usize = be64_to_cpu(p->u_size);
2921
2922 if (p_size == 0 && mdev->state.disk == D_DISKLESS) {
2923 dev_err(DEV, "some backing storage is needed\n");
2924 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
2925 return FALSE;
2926 }
2927
2928 /* just store the peer's disk size for now.
2929 * we still need to figure out whether we accept that. */
2930 mdev->p_size = p_size;
2931
Philipp Reisnerb411b362009-09-25 16:07:19 -07002932 if (get_ldev(mdev)) {
2933 warn_if_differ_considerably(mdev, "lower level device sizes",
2934 p_size, drbd_get_max_capacity(mdev->ldev));
2935 warn_if_differ_considerably(mdev, "user requested size",
2936 p_usize, mdev->ldev->dc.disk_size);
2937
2938 /* if this is the first connect, or an otherwise expected
2939 * param exchange, choose the minimum */
2940 if (mdev->state.conn == C_WF_REPORT_PARAMS)
2941 p_usize = min_not_zero((sector_t)mdev->ldev->dc.disk_size,
2942 p_usize);
2943
2944 my_usize = mdev->ldev->dc.disk_size;
2945
2946 if (mdev->ldev->dc.disk_size != p_usize) {
2947 mdev->ldev->dc.disk_size = p_usize;
2948 dev_info(DEV, "Peer sets u_size to %lu sectors\n",
2949 (unsigned long)mdev->ldev->dc.disk_size);
2950 }
2951
2952 /* Never shrink a device with usable data during connect.
2953 But allow online shrinking if we are connected. */
Philipp Reisnera393db62009-12-22 13:35:52 +01002954 if (drbd_new_dev_size(mdev, mdev->ldev, 0) <
Philipp Reisnerb411b362009-09-25 16:07:19 -07002955 drbd_get_capacity(mdev->this_bdev) &&
2956 mdev->state.disk >= D_OUTDATED &&
2957 mdev->state.conn < C_CONNECTED) {
2958 dev_err(DEV, "The peer's disk size is too small!\n");
2959 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
2960 mdev->ldev->dc.disk_size = my_usize;
2961 put_ldev(mdev);
2962 return FALSE;
2963 }
2964 put_ldev(mdev);
2965 }
Philipp Reisnerb411b362009-09-25 16:07:19 -07002966
Philipp Reisnere89b5912010-03-24 17:11:33 +01002967 ddsf = be16_to_cpu(p->dds_flags);
Philipp Reisnerb411b362009-09-25 16:07:19 -07002968 if (get_ldev(mdev)) {
Philipp Reisnere89b5912010-03-24 17:11:33 +01002969 dd = drbd_determin_dev_size(mdev, ddsf);
Philipp Reisnerb411b362009-09-25 16:07:19 -07002970 put_ldev(mdev);
2971 if (dd == dev_size_error)
2972 return FALSE;
2973 drbd_md_sync(mdev);
2974 } else {
2975 /* I am diskless, need to accept the peer's size. */
2976 drbd_set_my_capacity(mdev, p_size);
2977 }
2978
Philipp Reisnerb411b362009-09-25 16:07:19 -07002979 if (get_ldev(mdev)) {
2980 if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) {
2981 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
2982 ldsc = 1;
2983 }
2984
Lars Ellenberga1c88d02010-05-14 19:16:41 +02002985 if (mdev->agreed_pro_version < 94)
Lars Ellenberg1816a2b2010-11-11 15:19:07 +01002986 max_bio_size = be32_to_cpu(p->max_bio_size);
Lars Ellenberg8979d9c2010-09-14 15:56:29 +02002987 else if (mdev->agreed_pro_version == 94)
Lars Ellenberg1816a2b2010-11-11 15:19:07 +01002988 max_bio_size = DRBD_MAX_SIZE_H80_PACKET;
Lars Ellenberga1c88d02010-05-14 19:16:41 +02002989 else /* drbd 8.3.8 onwards */
Lars Ellenberg1816a2b2010-11-11 15:19:07 +01002990 max_bio_size = DRBD_MAX_BIO_SIZE;
Lars Ellenberga1c88d02010-05-14 19:16:41 +02002991
Lars Ellenberg1816a2b2010-11-11 15:19:07 +01002992 if (max_bio_size != queue_max_hw_sectors(mdev->rq_queue) << 9)
2993 drbd_setup_queue_param(mdev, max_bio_size);
Philipp Reisnerb411b362009-09-25 16:07:19 -07002994
Philipp Reisnere89b5912010-03-24 17:11:33 +01002995 drbd_setup_order_type(mdev, be16_to_cpu(p->queue_order_type));
Philipp Reisnerb411b362009-09-25 16:07:19 -07002996 put_ldev(mdev);
2997 }
2998
2999 if (mdev->state.conn > C_WF_REPORT_PARAMS) {
3000 if (be64_to_cpu(p->c_size) !=
3001 drbd_get_capacity(mdev->this_bdev) || ldsc) {
3002 /* we have different sizes, probably peer
3003 * needs to know my new size... */
Philipp Reisnere89b5912010-03-24 17:11:33 +01003004 drbd_send_sizes(mdev, 0, ddsf);
Philipp Reisnerb411b362009-09-25 16:07:19 -07003005 }
3006 if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) ||
3007 (dd == grew && mdev->state.conn == C_CONNECTED)) {
3008 if (mdev->state.pdsk >= D_INCONSISTENT &&
Philipp Reisnere89b5912010-03-24 17:11:33 +01003009 mdev->state.disk >= D_INCONSISTENT) {
3010 if (ddsf & DDSF_NO_RESYNC)
3011 dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n");
3012 else
3013 resync_after_online_grow(mdev);
3014 } else
Philipp Reisnerb411b362009-09-25 16:07:19 -07003015 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
3016 }
3017 }
3018
3019 return TRUE;
3020}
3021
Philipp Reisner02918be2010-08-20 14:35:10 +02003022static int receive_uuids(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
Philipp Reisnerb411b362009-09-25 16:07:19 -07003023{
Philipp Reisner02918be2010-08-20 14:35:10 +02003024 struct p_uuids *p = &mdev->data.rbuf.uuids;
Philipp Reisnerb411b362009-09-25 16:07:19 -07003025 u64 *p_uuid;
3026 int i;
3027
Philipp Reisnerb411b362009-09-25 16:07:19 -07003028 p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO);
3029
3030 for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++)
3031 p_uuid[i] = be64_to_cpu(p->uuid[i]);
3032
3033 kfree(mdev->p_uuid);
3034 mdev->p_uuid = p_uuid;
3035
3036 if (mdev->state.conn < C_CONNECTED &&
3037 mdev->state.disk < D_INCONSISTENT &&
3038 mdev->state.role == R_PRIMARY &&
3039 (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) {
3040 dev_err(DEV, "Can only connect to data with current UUID=%016llX\n",
3041 (unsigned long long)mdev->ed_uuid);
3042 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
3043 return FALSE;
3044 }
3045
3046 if (get_ldev(mdev)) {
3047 int skip_initial_sync =
3048 mdev->state.conn == C_CONNECTED &&
3049 mdev->agreed_pro_version >= 90 &&
3050 mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED &&
3051 (p_uuid[UI_FLAGS] & 8);
3052 if (skip_initial_sync) {
3053 dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n");
3054 drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write,
3055 "clear_n_write from receive_uuids");
3056 _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]);
3057 _drbd_uuid_set(mdev, UI_BITMAP, 0);
3058 _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
3059 CS_VERBOSE, NULL);
3060 drbd_md_sync(mdev);
3061 }
3062 put_ldev(mdev);
Philipp Reisner18a50fa2010-06-21 14:14:15 +02003063 } else if (mdev->state.disk < D_INCONSISTENT &&
3064 mdev->state.role == R_PRIMARY) {
3065 /* I am a diskless primary, the peer just created a new current UUID
3066 for me. */
3067 drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]);
Philipp Reisnerb411b362009-09-25 16:07:19 -07003068 }
3069
3070 /* Before we test for the disk state, we should wait until an eventually
3071 ongoing cluster wide state change is finished. That is important if
3072 we are primary and are detaching from our disk. We need to see the
3073 new disk state... */
3074 wait_event(mdev->misc_wait, !test_bit(CLUSTER_ST_CHANGE, &mdev->flags));
3075 if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT)
3076 drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]);
3077
3078 return TRUE;
3079}
3080
3081/**
3082 * convert_state() - Converts the peer's view of the cluster state to our point of view
3083 * @ps: The state as seen by the peer.
3084 */
3085static union drbd_state convert_state(union drbd_state ps)
3086{
3087 union drbd_state ms;
3088
3089 static enum drbd_conns c_tab[] = {
3090 [C_CONNECTED] = C_CONNECTED,
3091
3092 [C_STARTING_SYNC_S] = C_STARTING_SYNC_T,
3093 [C_STARTING_SYNC_T] = C_STARTING_SYNC_S,
3094 [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */
3095 [C_VERIFY_S] = C_VERIFY_T,
3096 [C_MASK] = C_MASK,
3097 };
3098
3099 ms.i = ps.i;
3100
3101 ms.conn = c_tab[ps.conn];
3102 ms.peer = ps.role;
3103 ms.role = ps.peer;
3104 ms.pdsk = ps.disk;
3105 ms.disk = ps.pdsk;
3106 ms.peer_isp = (ps.aftr_isp | ps.user_isp);
3107
3108 return ms;
3109}
3110
Philipp Reisner02918be2010-08-20 14:35:10 +02003111static int receive_req_state(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
Philipp Reisnerb411b362009-09-25 16:07:19 -07003112{
Philipp Reisner02918be2010-08-20 14:35:10 +02003113 struct p_req_state *p = &mdev->data.rbuf.req_state;
Philipp Reisnerb411b362009-09-25 16:07:19 -07003114 union drbd_state mask, val;
3115 int rv;
3116
Philipp Reisnerb411b362009-09-25 16:07:19 -07003117 mask.i = be32_to_cpu(p->mask);
3118 val.i = be32_to_cpu(p->val);
3119
3120 if (test_bit(DISCARD_CONCURRENT, &mdev->flags) &&
3121 test_bit(CLUSTER_ST_CHANGE, &mdev->flags)) {
3122 drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG);
3123 return TRUE;
3124 }
3125
3126 mask = convert_state(mask);
3127 val = convert_state(val);
3128
3129 rv = drbd_change_state(mdev, CS_VERBOSE, mask, val);
3130
3131 drbd_send_sr_reply(mdev, rv);
3132 drbd_md_sync(mdev);
3133
3134 return TRUE;
3135}
3136
Philipp Reisner02918be2010-08-20 14:35:10 +02003137static int receive_state(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
Philipp Reisnerb411b362009-09-25 16:07:19 -07003138{
Philipp Reisner02918be2010-08-20 14:35:10 +02003139 struct p_state *p = &mdev->data.rbuf.state;
Lars Ellenberg4ac4aad2010-07-22 17:39:26 +02003140 union drbd_state os, ns, peer_state;
Philipp Reisnerb411b362009-09-25 16:07:19 -07003141 enum drbd_disk_state real_peer_disk;
Philipp Reisner65d922c2010-06-16 16:18:09 +02003142 enum chg_state_flags cs_flags;
Philipp Reisnerb411b362009-09-25 16:07:19 -07003143 int rv;
3144
Philipp Reisnerb411b362009-09-25 16:07:19 -07003145 peer_state.i = be32_to_cpu(p->state);
3146
3147 real_peer_disk = peer_state.disk;
3148 if (peer_state.disk == D_NEGOTIATING) {
3149 real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT;
3150 dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk));
3151 }
3152
3153 spin_lock_irq(&mdev->req_lock);
3154 retry:
Lars Ellenberg4ac4aad2010-07-22 17:39:26 +02003155 os = ns = mdev->state;
Philipp Reisnerb411b362009-09-25 16:07:19 -07003156 spin_unlock_irq(&mdev->req_lock);
3157
Lars Ellenberge9ef7bb2010-10-07 15:55:39 +02003158 /* peer says his disk is uptodate, while we think it is inconsistent,
3159 * and this happens while we think we have a sync going on. */
3160 if (os.pdsk == D_INCONSISTENT && real_peer_disk == D_UP_TO_DATE &&
3161 os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) {
3162 /* If we are (becoming) SyncSource, but peer is still in sync
3163 * preparation, ignore its uptodate-ness to avoid flapping, it
3164 * will change to inconsistent once the peer reaches active
3165 * syncing states.
3166 * It may have changed syncer-paused flags, however, so we
3167 * cannot ignore this completely. */
3168 if (peer_state.conn > C_CONNECTED &&
3169 peer_state.conn < C_SYNC_SOURCE)
3170 real_peer_disk = D_INCONSISTENT;
3171
3172 /* if peer_state changes to connected at the same time,
3173 * it explicitly notifies us that it finished resync.
3174 * Maybe we should finish it up, too? */
3175 else if (os.conn >= C_SYNC_SOURCE &&
3176 peer_state.conn == C_CONNECTED) {
3177 if (drbd_bm_total_weight(mdev) <= mdev->rs_failed)
3178 drbd_resync_finished(mdev);
3179 return TRUE;
3180 }
3181 }
3182
3183 /* peer says his disk is inconsistent, while we think it is uptodate,
3184 * and this happens while the peer still thinks we have a sync going on,
3185 * but we think we are already done with the sync.
3186 * We ignore this to avoid flapping pdsk.
3187 * This should not happen, if the peer is a recent version of drbd. */
3188 if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT &&
3189 os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE)
3190 real_peer_disk = D_UP_TO_DATE;
3191
Lars Ellenberg4ac4aad2010-07-22 17:39:26 +02003192 if (ns.conn == C_WF_REPORT_PARAMS)
3193 ns.conn = C_CONNECTED;
Philipp Reisnerb411b362009-09-25 16:07:19 -07003194
Philipp Reisner67531712010-10-27 12:21:30 +02003195 if (peer_state.conn == C_AHEAD)
3196 ns.conn = C_BEHIND;
3197
Philipp Reisnerb411b362009-09-25 16:07:19 -07003198 if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING &&
3199 get_ldev_if_state(mdev, D_NEGOTIATING)) {
3200 int cr; /* consider resync */
3201
3202 /* if we established a new connection */
Lars Ellenberg4ac4aad2010-07-22 17:39:26 +02003203 cr = (os.conn < C_CONNECTED);
Philipp Reisnerb411b362009-09-25 16:07:19 -07003204 /* if we had an established connection
3205 * and one of the nodes newly attaches a disk */
Lars Ellenberg4ac4aad2010-07-22 17:39:26 +02003206 cr |= (os.conn == C_CONNECTED &&
Philipp Reisnerb411b362009-09-25 16:07:19 -07003207 (peer_state.disk == D_NEGOTIATING ||
Lars Ellenberg4ac4aad2010-07-22 17:39:26 +02003208 os.disk == D_NEGOTIATING));
Philipp Reisnerb411b362009-09-25 16:07:19 -07003209 /* if we have both been inconsistent, and the peer has been
3210 * forced to be UpToDate with --overwrite-data */
3211 cr |= test_bit(CONSIDER_RESYNC, &mdev->flags);
3212 /* if we had been plain connected, and the admin requested to
3213 * start a sync by "invalidate" or "invalidate-remote" */
Lars Ellenberg4ac4aad2010-07-22 17:39:26 +02003214 cr |= (os.conn == C_CONNECTED &&
Philipp Reisnerb411b362009-09-25 16:07:19 -07003215 (peer_state.conn >= C_STARTING_SYNC_S &&
3216 peer_state.conn <= C_WF_BITMAP_T));
3217
3218 if (cr)
Lars Ellenberg4ac4aad2010-07-22 17:39:26 +02003219 ns.conn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk);
Philipp Reisnerb411b362009-09-25 16:07:19 -07003220
3221 put_ldev(mdev);
Lars Ellenberg4ac4aad2010-07-22 17:39:26 +02003222 if (ns.conn == C_MASK) {
3223 ns.conn = C_CONNECTED;
Philipp Reisnerb411b362009-09-25 16:07:19 -07003224 if (mdev->state.disk == D_NEGOTIATING) {
Lars Ellenberg82f59cc2010-10-16 12:13:47 +02003225 drbd_force_state(mdev, NS(disk, D_FAILED));
Philipp Reisnerb411b362009-09-25 16:07:19 -07003226 } else if (peer_state.disk == D_NEGOTIATING) {
3227 dev_err(DEV, "Disk attach process on the peer node was aborted.\n");
3228 peer_state.disk = D_DISKLESS;
Lars Ellenberg580b9762010-02-26 23:15:23 +01003229 real_peer_disk = D_DISKLESS;
Philipp Reisnerb411b362009-09-25 16:07:19 -07003230 } else {
Philipp Reisnercf14c2e2010-02-02 21:03:50 +01003231 if (test_and_clear_bit(CONN_DRY_RUN, &mdev->flags))
3232 return FALSE;
Lars Ellenberg4ac4aad2010-07-22 17:39:26 +02003233 D_ASSERT(os.conn == C_WF_REPORT_PARAMS);
Philipp Reisnerb411b362009-09-25 16:07:19 -07003234 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
3235 return FALSE;
3236 }
3237 }
3238 }
3239
3240 spin_lock_irq(&mdev->req_lock);
Lars Ellenberg4ac4aad2010-07-22 17:39:26 +02003241 if (mdev->state.i != os.i)
Philipp Reisnerb411b362009-09-25 16:07:19 -07003242 goto retry;
3243 clear_bit(CONSIDER_RESYNC, &mdev->flags);
Philipp Reisnerb411b362009-09-25 16:07:19 -07003244 ns.peer = peer_state.role;
3245 ns.pdsk = real_peer_disk;
3246 ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp);
Lars Ellenberg4ac4aad2010-07-22 17:39:26 +02003247 if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING)
Philipp Reisnerb411b362009-09-25 16:07:19 -07003248 ns.disk = mdev->new_state_tmp.disk;
Lars Ellenberg4ac4aad2010-07-22 17:39:26 +02003249 cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD);
3250 if (ns.pdsk == D_CONSISTENT && is_susp(ns) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED &&
Philipp Reisner481c6f52010-06-22 14:03:27 +02003251 test_bit(NEW_CUR_UUID, &mdev->flags)) {
3252 /* Do not allow tl_restart(resend) for a rebooted peer. We can only allow this
3253 for temporal network outages! */
3254 spin_unlock_irq(&mdev->req_lock);
3255 dev_err(DEV, "Aborting Connect, can not thaw IO with an only Consistent peer\n");
3256 tl_clear(mdev);
3257 drbd_uuid_new_current(mdev);
3258 clear_bit(NEW_CUR_UUID, &mdev->flags);
3259 drbd_force_state(mdev, NS2(conn, C_PROTOCOL_ERROR, susp, 0));
3260 return FALSE;
3261 }
Philipp Reisner65d922c2010-06-16 16:18:09 +02003262 rv = _drbd_set_state(mdev, ns, cs_flags, NULL);
Philipp Reisnerb411b362009-09-25 16:07:19 -07003263 ns = mdev->state;
3264 spin_unlock_irq(&mdev->req_lock);
3265
3266 if (rv < SS_SUCCESS) {
3267 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
3268 return FALSE;
3269 }
3270
Lars Ellenberg4ac4aad2010-07-22 17:39:26 +02003271 if (os.conn > C_WF_REPORT_PARAMS) {
3272 if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED &&
Philipp Reisnerb411b362009-09-25 16:07:19 -07003273 peer_state.disk != D_NEGOTIATING ) {
3274 /* we want resync, peer has not yet decided to sync... */
3275 /* Nowadays only used when forcing a node into primary role and
3276 setting its disk to UpToDate with that */
3277 drbd_send_uuids(mdev);
3278 drbd_send_state(mdev);
3279 }
3280 }
3281
3282 mdev->net_conf->want_lose = 0;
3283
3284 drbd_md_sync(mdev); /* update connected indicator, la_size, ... */
3285
3286 return TRUE;
3287}
3288
Philipp Reisner02918be2010-08-20 14:35:10 +02003289static int receive_sync_uuid(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
Philipp Reisnerb411b362009-09-25 16:07:19 -07003290{
Philipp Reisner02918be2010-08-20 14:35:10 +02003291 struct p_rs_uuid *p = &mdev->data.rbuf.rs_uuid;
Philipp Reisnerb411b362009-09-25 16:07:19 -07003292
3293 wait_event(mdev->misc_wait,
3294 mdev->state.conn == C_WF_SYNC_UUID ||
Philipp Reisnerc4752ef2010-10-27 17:32:36 +02003295 mdev->state.conn == C_BEHIND ||
Philipp Reisnerb411b362009-09-25 16:07:19 -07003296 mdev->state.conn < C_CONNECTED ||
3297 mdev->state.disk < D_NEGOTIATING);
3298
3299 /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */
3300
Philipp Reisnerb411b362009-09-25 16:07:19 -07003301 /* Here the _drbd_uuid_ functions are right, current should
3302 _not_ be rotated into the history */
3303 if (get_ldev_if_state(mdev, D_NEGOTIATING)) {
3304 _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid));
3305 _drbd_uuid_set(mdev, UI_BITMAP, 0UL);
3306
3307 drbd_start_resync(mdev, C_SYNC_TARGET);
3308
3309 put_ldev(mdev);
3310 } else
3311 dev_err(DEV, "Ignoring SyncUUID packet!\n");
3312
3313 return TRUE;
3314}
3315
3316enum receive_bitmap_ret { OK, DONE, FAILED };
3317
3318static enum receive_bitmap_ret
Philipp Reisner02918be2010-08-20 14:35:10 +02003319receive_bitmap_plain(struct drbd_conf *mdev, unsigned int data_size,
3320 unsigned long *buffer, struct bm_xfer_ctx *c)
Philipp Reisnerb411b362009-09-25 16:07:19 -07003321{
3322 unsigned num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset);
3323 unsigned want = num_words * sizeof(long);
3324
Philipp Reisner02918be2010-08-20 14:35:10 +02003325 if (want != data_size) {
3326 dev_err(DEV, "%s:want (%u) != data_size (%u)\n", __func__, want, data_size);
Philipp Reisnerb411b362009-09-25 16:07:19 -07003327 return FAILED;
3328 }
3329 if (want == 0)
3330 return DONE;
3331 if (drbd_recv(mdev, buffer, want) != want)
3332 return FAILED;
3333
3334 drbd_bm_merge_lel(mdev, c->word_offset, num_words, buffer);
3335
3336 c->word_offset += num_words;
3337 c->bit_offset = c->word_offset * BITS_PER_LONG;
3338 if (c->bit_offset > c->bm_bits)
3339 c->bit_offset = c->bm_bits;
3340
3341 return OK;
3342}
3343
3344static enum receive_bitmap_ret
3345recv_bm_rle_bits(struct drbd_conf *mdev,
3346 struct p_compressed_bm *p,
3347 struct bm_xfer_ctx *c)
3348{
3349 struct bitstream bs;
3350 u64 look_ahead;
3351 u64 rl;
3352 u64 tmp;
3353 unsigned long s = c->bit_offset;
3354 unsigned long e;
Lars Ellenberg004352f2010-10-05 20:13:58 +02003355 int len = be16_to_cpu(p->head.length) - (sizeof(*p) - sizeof(p->head));
Philipp Reisnerb411b362009-09-25 16:07:19 -07003356 int toggle = DCBP_get_start(p);
3357 int have;
3358 int bits;
3359
3360 bitstream_init(&bs, p->code, len, DCBP_get_pad_bits(p));
3361
3362 bits = bitstream_get_bits(&bs, &look_ahead, 64);
3363 if (bits < 0)
3364 return FAILED;
3365
3366 for (have = bits; have > 0; s += rl, toggle = !toggle) {
3367 bits = vli_decode_bits(&rl, look_ahead);
3368 if (bits <= 0)
3369 return FAILED;
3370
3371 if (toggle) {
3372 e = s + rl -1;
3373 if (e >= c->bm_bits) {
3374 dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e);
3375 return FAILED;
3376 }
3377 _drbd_bm_set_bits(mdev, s, e);
3378 }
3379
3380 if (have < bits) {
3381 dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n",
3382 have, bits, look_ahead,
3383 (unsigned int)(bs.cur.b - p->code),
3384 (unsigned int)bs.buf_len);
3385 return FAILED;
3386 }
3387 look_ahead >>= bits;
3388 have -= bits;
3389
3390 bits = bitstream_get_bits(&bs, &tmp, 64 - have);
3391 if (bits < 0)
3392 return FAILED;
3393 look_ahead |= tmp << have;
3394 have += bits;
3395 }
3396
3397 c->bit_offset = s;
3398 bm_xfer_ctx_bit_to_word_offset(c);
3399
3400 return (s == c->bm_bits) ? DONE : OK;
3401}
3402
3403static enum receive_bitmap_ret
3404decode_bitmap_c(struct drbd_conf *mdev,
3405 struct p_compressed_bm *p,
3406 struct bm_xfer_ctx *c)
3407{
3408 if (DCBP_get_code(p) == RLE_VLI_Bits)
3409 return recv_bm_rle_bits(mdev, p, c);
3410
3411 /* other variants had been implemented for evaluation,
3412 * but have been dropped as this one turned out to be "best"
3413 * during all our tests. */
3414
3415 dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding);
3416 drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR));
3417 return FAILED;
3418}
3419
3420void INFO_bm_xfer_stats(struct drbd_conf *mdev,
3421 const char *direction, struct bm_xfer_ctx *c)
3422{
3423 /* what would it take to transfer it "plaintext" */
Philipp Reisner0b70a132010-08-20 13:36:10 +02003424 unsigned plain = sizeof(struct p_header80) *
Philipp Reisnerb411b362009-09-25 16:07:19 -07003425 ((c->bm_words+BM_PACKET_WORDS-1)/BM_PACKET_WORDS+1)
3426 + c->bm_words * sizeof(long);
3427 unsigned total = c->bytes[0] + c->bytes[1];
3428 unsigned r;
3429
3430 /* total can not be zero. but just in case: */
3431 if (total == 0)
3432 return;
3433
3434 /* don't report if not compressed */
3435 if (total >= plain)
3436 return;
3437
3438 /* total < plain. check for overflow, still */
3439 r = (total > UINT_MAX/1000) ? (total / (plain/1000))
3440 : (1000 * total / plain);
3441
3442 if (r > 1000)
3443 r = 1000;
3444
3445 r = 1000 - r;
3446 dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), "
3447 "total %u; compression: %u.%u%%\n",
3448 direction,
3449 c->bytes[1], c->packets[1],
3450 c->bytes[0], c->packets[0],
3451 total, r/10, r % 10);
3452}
3453
3454/* Since we are processing the bitfield from lower addresses to higher,
3455 it does not matter if the process it in 32 bit chunks or 64 bit
3456 chunks as long as it is little endian. (Understand it as byte stream,
3457 beginning with the lowest byte...) If we would use big endian
3458 we would need to process it from the highest address to the lowest,
3459 in order to be agnostic to the 32 vs 64 bits issue.
3460
3461 returns 0 on failure, 1 if we successfully received it. */
Philipp Reisner02918be2010-08-20 14:35:10 +02003462static int receive_bitmap(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
Philipp Reisnerb411b362009-09-25 16:07:19 -07003463{
3464 struct bm_xfer_ctx c;
3465 void *buffer;
3466 enum receive_bitmap_ret ret;
3467 int ok = FALSE;
Philipp Reisner02918be2010-08-20 14:35:10 +02003468 struct p_header80 *h = &mdev->data.rbuf.header.h80;
Philipp Reisnerb411b362009-09-25 16:07:19 -07003469
Philipp Reisner37190942010-11-10 12:08:37 +01003470 /* drbd_bm_lock(mdev, "receive bitmap"); By intention no bm_lock */
Philipp Reisnerb411b362009-09-25 16:07:19 -07003471
3472 /* maybe we should use some per thread scratch page,
3473 * and allocate that during initial device creation? */
3474 buffer = (unsigned long *) __get_free_page(GFP_NOIO);
3475 if (!buffer) {
3476 dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__);
3477 goto out;
3478 }
3479
3480 c = (struct bm_xfer_ctx) {
3481 .bm_bits = drbd_bm_bits(mdev),
3482 .bm_words = drbd_bm_words(mdev),
3483 };
3484
3485 do {
Philipp Reisner02918be2010-08-20 14:35:10 +02003486 if (cmd == P_BITMAP) {
3487 ret = receive_bitmap_plain(mdev, data_size, buffer, &c);
3488 } else if (cmd == P_COMPRESSED_BITMAP) {
Philipp Reisnerb411b362009-09-25 16:07:19 -07003489 /* MAYBE: sanity check that we speak proto >= 90,
3490 * and the feature is enabled! */
3491 struct p_compressed_bm *p;
3492
Philipp Reisner02918be2010-08-20 14:35:10 +02003493 if (data_size > BM_PACKET_PAYLOAD_BYTES) {
Philipp Reisnerb411b362009-09-25 16:07:19 -07003494 dev_err(DEV, "ReportCBitmap packet too large\n");
3495 goto out;
3496 }
3497 /* use the page buff */
3498 p = buffer;
3499 memcpy(p, h, sizeof(*h));
Philipp Reisner02918be2010-08-20 14:35:10 +02003500 if (drbd_recv(mdev, p->head.payload, data_size) != data_size)
Philipp Reisnerb411b362009-09-25 16:07:19 -07003501 goto out;
Lars Ellenberg004352f2010-10-05 20:13:58 +02003502 if (data_size <= (sizeof(*p) - sizeof(p->head))) {
3503 dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", data_size);
Philipp Reisnerb411b362009-09-25 16:07:19 -07003504 return FAILED;
3505 }
3506 ret = decode_bitmap_c(mdev, p, &c);
3507 } else {
Philipp Reisner02918be2010-08-20 14:35:10 +02003508 dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", cmd);
Philipp Reisnerb411b362009-09-25 16:07:19 -07003509 goto out;
3510 }
3511
Philipp Reisner02918be2010-08-20 14:35:10 +02003512 c.packets[cmd == P_BITMAP]++;
3513 c.bytes[cmd == P_BITMAP] += sizeof(struct p_header80) + data_size;
Philipp Reisnerb411b362009-09-25 16:07:19 -07003514
3515 if (ret != OK)
3516 break;
3517
Philipp Reisner02918be2010-08-20 14:35:10 +02003518 if (!drbd_recv_header(mdev, &cmd, &data_size))
Philipp Reisnerb411b362009-09-25 16:07:19 -07003519 goto out;
3520 } while (ret == OK);
3521 if (ret == FAILED)
3522 goto out;
3523
3524 INFO_bm_xfer_stats(mdev, "receive", &c);
3525
3526 if (mdev->state.conn == C_WF_BITMAP_T) {
3527 ok = !drbd_send_bitmap(mdev);
3528 if (!ok)
3529 goto out;
3530 /* Omit CS_ORDERED with this state transition to avoid deadlocks. */
3531 ok = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE);
3532 D_ASSERT(ok == SS_SUCCESS);
3533 } else if (mdev->state.conn != C_WF_BITMAP_S) {
3534 /* admin may have requested C_DISCONNECTING,
3535 * other threads may have noticed network errors */
3536 dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n",
3537 drbd_conn_str(mdev->state.conn));
3538 }
3539
3540 ok = TRUE;
3541 out:
Philipp Reisner37190942010-11-10 12:08:37 +01003542 /* drbd_bm_unlock(mdev); by intention no lock */
Philipp Reisnerb411b362009-09-25 16:07:19 -07003543 if (ok && mdev->state.conn == C_WF_BITMAP_S)
3544 drbd_start_resync(mdev, C_SYNC_SOURCE);
3545 free_page((unsigned long) buffer);
3546 return ok;
3547}
3548
Philipp Reisner02918be2010-08-20 14:35:10 +02003549static int receive_skip(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
Philipp Reisnerb411b362009-09-25 16:07:19 -07003550{
3551 /* TODO zero copy sink :) */
3552 static char sink[128];
3553 int size, want, r;
3554
Philipp Reisner02918be2010-08-20 14:35:10 +02003555 dev_warn(DEV, "skipping unknown optional packet type %d, l: %d!\n",
3556 cmd, data_size);
Philipp Reisnerb411b362009-09-25 16:07:19 -07003557
Philipp Reisner02918be2010-08-20 14:35:10 +02003558 size = data_size;
Philipp Reisnerb411b362009-09-25 16:07:19 -07003559 while (size > 0) {
3560 want = min_t(int, size, sizeof(sink));
3561 r = drbd_recv(mdev, sink, want);
3562 ERR_IF(r <= 0) break;
3563 size -= r;
3564 }
3565 return size == 0;
3566}
3567
Philipp Reisner02918be2010-08-20 14:35:10 +02003568static int receive_UnplugRemote(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
Philipp Reisnerb411b362009-09-25 16:07:19 -07003569{
Philipp Reisnerb411b362009-09-25 16:07:19 -07003570 /* Make sure we've acked all the TCP data associated
3571 * with the data requests being unplugged */
3572 drbd_tcp_quickack(mdev->data.socket);
3573
3574 return TRUE;
3575}
3576
Philipp Reisner73a01a12010-10-27 14:33:00 +02003577static int receive_out_of_sync(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size)
3578{
3579 struct p_block_desc *p = &mdev->data.rbuf.block_desc;
3580
3581 drbd_set_out_of_sync(mdev, be64_to_cpu(p->sector), be32_to_cpu(p->blksize));
3582
3583 return TRUE;
3584}
3585
Philipp Reisner02918be2010-08-20 14:35:10 +02003586typedef int (*drbd_cmd_handler_f)(struct drbd_conf *, enum drbd_packets cmd, unsigned int to_receive);
Philipp Reisnerb411b362009-09-25 16:07:19 -07003587
Philipp Reisner02918be2010-08-20 14:35:10 +02003588struct data_cmd {
3589 int expect_payload;
3590 size_t pkt_size;
3591 drbd_cmd_handler_f function;
Philipp Reisnerb411b362009-09-25 16:07:19 -07003592};
3593
Philipp Reisner02918be2010-08-20 14:35:10 +02003594static struct data_cmd drbd_cmd_handler[] = {
3595 [P_DATA] = { 1, sizeof(struct p_data), receive_Data },
3596 [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply },
3597 [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } ,
3598 [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } ,
3599 [P_BITMAP] = { 1, sizeof(struct p_header80), receive_bitmap } ,
3600 [P_COMPRESSED_BITMAP] = { 1, sizeof(struct p_header80), receive_bitmap } ,
3601 [P_UNPLUG_REMOTE] = { 0, sizeof(struct p_header80), receive_UnplugRemote },
3602 [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest },
3603 [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest },
3604 [P_SYNC_PARAM] = { 1, sizeof(struct p_header80), receive_SyncParam },
3605 [P_SYNC_PARAM89] = { 1, sizeof(struct p_header80), receive_SyncParam },
3606 [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol },
3607 [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids },
3608 [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes },
3609 [P_STATE] = { 0, sizeof(struct p_state), receive_state },
3610 [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state },
3611 [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid },
3612 [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest },
3613 [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest },
3614 [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest },
3615 [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip },
Philipp Reisner73a01a12010-10-27 14:33:00 +02003616 [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync },
Philipp Reisner02918be2010-08-20 14:35:10 +02003617 /* anything missing from this table is in
3618 * the asender_tbl, see get_asender_cmd */
3619 [P_MAX_CMD] = { 0, 0, NULL },
3620};
3621
3622/* All handler functions that expect a sub-header get that sub-heder in
3623 mdev->data.rbuf.header.head.payload.
3624
3625 Usually in mdev->data.rbuf.header.head the callback can find the usual
3626 p_header, but they may not rely on that. Since there is also p_header95 !
3627 */
Philipp Reisnerb411b362009-09-25 16:07:19 -07003628
3629static void drbdd(struct drbd_conf *mdev)
3630{
Philipp Reisner02918be2010-08-20 14:35:10 +02003631 union p_header *header = &mdev->data.rbuf.header;
3632 unsigned int packet_size;
3633 enum drbd_packets cmd;
3634 size_t shs; /* sub header size */
3635 int rv;
Philipp Reisnerb411b362009-09-25 16:07:19 -07003636
3637 while (get_t_state(&mdev->receiver) == Running) {
3638 drbd_thread_current_set_cpu(mdev);
Philipp Reisner02918be2010-08-20 14:35:10 +02003639 if (!drbd_recv_header(mdev, &cmd, &packet_size))
3640 goto err_out;
3641
3642 if (unlikely(cmd >= P_MAX_CMD || !drbd_cmd_handler[cmd].function)) {
3643 dev_err(DEV, "unknown packet type %d, l: %d!\n", cmd, packet_size);
3644 goto err_out;
Lars Ellenberg0b33a912009-11-16 15:58:04 +01003645 }
Philipp Reisnerb411b362009-09-25 16:07:19 -07003646
Philipp Reisner02918be2010-08-20 14:35:10 +02003647 shs = drbd_cmd_handler[cmd].pkt_size - sizeof(union p_header);
Philipp Reisner02918be2010-08-20 14:35:10 +02003648 if (packet_size - shs > 0 && !drbd_cmd_handler[cmd].expect_payload) {
3649 dev_err(DEV, "No payload expected %s l:%d\n", cmdname(cmd), packet_size);
3650 goto err_out;
3651 }
3652
Lars Ellenbergc13f7e12010-10-29 23:32:01 +02003653 if (shs) {
3654 rv = drbd_recv(mdev, &header->h80.payload, shs);
3655 if (unlikely(rv != shs)) {
3656 dev_err(DEV, "short read while reading sub header: rv=%d\n", rv);
3657 goto err_out;
3658 }
3659 }
3660
Philipp Reisner02918be2010-08-20 14:35:10 +02003661 rv = drbd_cmd_handler[cmd].function(mdev, cmd, packet_size - shs);
3662
3663 if (unlikely(!rv)) {
Philipp Reisnerb411b362009-09-25 16:07:19 -07003664 dev_err(DEV, "error receiving %s, l: %d!\n",
Philipp Reisner02918be2010-08-20 14:35:10 +02003665 cmdname(cmd), packet_size);
3666 goto err_out;
Philipp Reisnerb411b362009-09-25 16:07:19 -07003667 }
Philipp Reisnerb411b362009-09-25 16:07:19 -07003668 }
Philipp Reisnerb411b362009-09-25 16:07:19 -07003669
Philipp Reisner02918be2010-08-20 14:35:10 +02003670 if (0) {
3671 err_out:
3672 drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR));
Philipp Reisnerb411b362009-09-25 16:07:19 -07003673 }
Lars Ellenberg856c50c2010-10-14 13:37:40 +02003674 /* If we leave here, we probably want to update at least the
3675 * "Connected" indicator on stable storage. Do so explicitly here. */
3676 drbd_md_sync(mdev);
Philipp Reisnerb411b362009-09-25 16:07:19 -07003677}
3678
3679void drbd_flush_workqueue(struct drbd_conf *mdev)
3680{
3681 struct drbd_wq_barrier barr;
3682
3683 barr.w.cb = w_prev_work_done;
3684 init_completion(&barr.done);
3685 drbd_queue_work(&mdev->data.work, &barr.w);
3686 wait_for_completion(&barr.done);
3687}
3688
Philipp Reisnerf70b35112010-06-24 14:34:40 +02003689void drbd_free_tl_hash(struct drbd_conf *mdev)
3690{
3691 struct hlist_head *h;
3692
3693 spin_lock_irq(&mdev->req_lock);
3694
3695 if (!mdev->tl_hash || mdev->state.conn != C_STANDALONE) {
3696 spin_unlock_irq(&mdev->req_lock);
3697 return;
3698 }
3699 /* paranoia code */
3700 for (h = mdev->ee_hash; h < mdev->ee_hash + mdev->ee_hash_s; h++)
3701 if (h->first)
3702 dev_err(DEV, "ASSERT FAILED ee_hash[%u].first == %p, expected NULL\n",
3703 (int)(h - mdev->ee_hash), h->first);
3704 kfree(mdev->ee_hash);
3705 mdev->ee_hash = NULL;
3706 mdev->ee_hash_s = 0;
3707
3708 /* paranoia code */
3709 for (h = mdev->tl_hash; h < mdev->tl_hash + mdev->tl_hash_s; h++)
3710 if (h->first)
3711 dev_err(DEV, "ASSERT FAILED tl_hash[%u] == %p, expected NULL\n",
3712 (int)(h - mdev->tl_hash), h->first);
3713 kfree(mdev->tl_hash);
3714 mdev->tl_hash = NULL;
3715 mdev->tl_hash_s = 0;
3716 spin_unlock_irq(&mdev->req_lock);
3717}
3718
Philipp Reisnerb411b362009-09-25 16:07:19 -07003719static void drbd_disconnect(struct drbd_conf *mdev)
3720{
3721 enum drbd_fencing_p fp;
3722 union drbd_state os, ns;
3723 int rv = SS_UNKNOWN_ERROR;
3724 unsigned int i;
3725
3726 if (mdev->state.conn == C_STANDALONE)
3727 return;
3728 if (mdev->state.conn >= C_WF_CONNECTION)
3729 dev_err(DEV, "ASSERT FAILED cstate = %s, expected < WFConnection\n",
3730 drbd_conn_str(mdev->state.conn));
3731
3732 /* asender does not clean up anything. it must not interfere, either */
3733 drbd_thread_stop(&mdev->asender);
Philipp Reisnerb411b362009-09-25 16:07:19 -07003734 drbd_free_sock(mdev);
Philipp Reisnerb411b362009-09-25 16:07:19 -07003735
Philipp Reisner85719572010-07-21 10:20:17 +02003736 /* wait for current activity to cease. */
Philipp Reisnerb411b362009-09-25 16:07:19 -07003737 spin_lock_irq(&mdev->req_lock);
3738 _drbd_wait_ee_list_empty(mdev, &mdev->active_ee);
3739 _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee);
3740 _drbd_wait_ee_list_empty(mdev, &mdev->read_ee);
3741 spin_unlock_irq(&mdev->req_lock);
3742
3743 /* We do not have data structures that would allow us to
3744 * get the rs_pending_cnt down to 0 again.
3745 * * On C_SYNC_TARGET we do not have any data structures describing
3746 * the pending RSDataRequest's we have sent.
3747 * * On C_SYNC_SOURCE there is no data structure that tracks
3748 * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget.
3749 * And no, it is not the sum of the reference counts in the
3750 * resync_LRU. The resync_LRU tracks the whole operation including
3751 * the disk-IO, while the rs_pending_cnt only tracks the blocks
3752 * on the fly. */
3753 drbd_rs_cancel_all(mdev);
3754 mdev->rs_total = 0;
3755 mdev->rs_failed = 0;
3756 atomic_set(&mdev->rs_pending_cnt, 0);
3757 wake_up(&mdev->misc_wait);
3758
3759 /* make sure syncer is stopped and w_resume_next_sg queued */
3760 del_timer_sync(&mdev->resync_timer);
Philipp Reisnerb411b362009-09-25 16:07:19 -07003761 resync_timer_fn((unsigned long)mdev);
3762
Philipp Reisnerb411b362009-09-25 16:07:19 -07003763 /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier,
3764 * w_make_resync_request etc. which may still be on the worker queue
3765 * to be "canceled" */
3766 drbd_flush_workqueue(mdev);
3767
3768 /* This also does reclaim_net_ee(). If we do this too early, we might
3769 * miss some resync ee and pages.*/
3770 drbd_process_done_ee(mdev);
3771
3772 kfree(mdev->p_uuid);
3773 mdev->p_uuid = NULL;
3774
Philipp Reisnerfb22c402010-09-08 23:20:21 +02003775 if (!is_susp(mdev->state))
Philipp Reisnerb411b362009-09-25 16:07:19 -07003776 tl_clear(mdev);
3777
Philipp Reisnerb411b362009-09-25 16:07:19 -07003778 dev_info(DEV, "Connection closed\n");
3779
3780 drbd_md_sync(mdev);
3781
3782 fp = FP_DONT_CARE;
3783 if (get_ldev(mdev)) {
3784 fp = mdev->ldev->dc.fencing;
3785 put_ldev(mdev);
3786 }
3787
Philipp Reisner87f7be42010-06-11 13:56:33 +02003788 if (mdev->state.role == R_PRIMARY && fp >= FP_RESOURCE && mdev->state.pdsk >= D_UNKNOWN)
3789 drbd_try_outdate_peer_async(mdev);
Philipp Reisnerb411b362009-09-25 16:07:19 -07003790
3791 spin_lock_irq(&mdev->req_lock);
3792 os = mdev->state;
3793 if (os.conn >= C_UNCONNECTED) {
3794 /* Do not restart in case we are C_DISCONNECTING */
3795 ns = os;
3796 ns.conn = C_UNCONNECTED;
3797 rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
3798 }
3799 spin_unlock_irq(&mdev->req_lock);
3800
3801 if (os.conn == C_DISCONNECTING) {
Philipp Reisner84dfb9f2010-06-23 11:20:05 +02003802 wait_event(mdev->net_cnt_wait, atomic_read(&mdev->net_cnt) == 0);
Philipp Reisnerb411b362009-09-25 16:07:19 -07003803
Philipp Reisnerb411b362009-09-25 16:07:19 -07003804 crypto_free_hash(mdev->cram_hmac_tfm);
3805 mdev->cram_hmac_tfm = NULL;
3806
3807 kfree(mdev->net_conf);
3808 mdev->net_conf = NULL;
3809 drbd_request_state(mdev, NS(conn, C_STANDALONE));
3810 }
3811
3812 /* tcp_close and release of sendpage pages can be deferred. I don't
3813 * want to use SO_LINGER, because apparently it can be deferred for
3814 * more than 20 seconds (longest time I checked).
3815 *
3816 * Actually we don't care for exactly when the network stack does its
3817 * put_page(), but release our reference on these pages right here.
3818 */
3819 i = drbd_release_ee(mdev, &mdev->net_ee);
3820 if (i)
3821 dev_info(DEV, "net_ee not empty, killed %u entries\n", i);
Lars Ellenberg435f0742010-09-06 12:30:25 +02003822 i = atomic_read(&mdev->pp_in_use_by_net);
3823 if (i)
3824 dev_info(DEV, "pp_in_use_by_net = %d, expected 0\n", i);
Philipp Reisnerb411b362009-09-25 16:07:19 -07003825 i = atomic_read(&mdev->pp_in_use);
3826 if (i)
Lars Ellenberg45bb9122010-05-14 17:10:48 +02003827 dev_info(DEV, "pp_in_use = %d, expected 0\n", i);
Philipp Reisnerb411b362009-09-25 16:07:19 -07003828
3829 D_ASSERT(list_empty(&mdev->read_ee));
3830 D_ASSERT(list_empty(&mdev->active_ee));
3831 D_ASSERT(list_empty(&mdev->sync_ee));
3832 D_ASSERT(list_empty(&mdev->done_ee));
3833
3834 /* ok, no more ee's on the fly, it is safe to reset the epoch_size */
3835 atomic_set(&mdev->current_epoch->epoch_size, 0);
3836 D_ASSERT(list_empty(&mdev->current_epoch->list));
3837}
3838
3839/*
3840 * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version
3841 * we can agree on is stored in agreed_pro_version.
3842 *
3843 * feature flags and the reserved array should be enough room for future
3844 * enhancements of the handshake protocol, and possible plugins...
3845 *
3846 * for now, they are expected to be zero, but ignored.
3847 */
3848static int drbd_send_handshake(struct drbd_conf *mdev)
3849{
3850 /* ASSERT current == mdev->receiver ... */
3851 struct p_handshake *p = &mdev->data.sbuf.handshake;
3852 int ok;
3853
3854 if (mutex_lock_interruptible(&mdev->data.mutex)) {
3855 dev_err(DEV, "interrupted during initial handshake\n");
3856 return 0; /* interrupted. not ok. */
3857 }
3858
3859 if (mdev->data.socket == NULL) {
3860 mutex_unlock(&mdev->data.mutex);
3861 return 0;
3862 }
3863
3864 memset(p, 0, sizeof(*p));
3865 p->protocol_min = cpu_to_be32(PRO_VERSION_MIN);
3866 p->protocol_max = cpu_to_be32(PRO_VERSION_MAX);
3867 ok = _drbd_send_cmd( mdev, mdev->data.socket, P_HAND_SHAKE,
Philipp Reisner0b70a132010-08-20 13:36:10 +02003868 (struct p_header80 *)p, sizeof(*p), 0 );
Philipp Reisnerb411b362009-09-25 16:07:19 -07003869 mutex_unlock(&mdev->data.mutex);
3870 return ok;
3871}
3872
3873/*
3874 * return values:
3875 * 1 yes, we have a valid connection
3876 * 0 oops, did not work out, please try again
3877 * -1 peer talks different language,
3878 * no point in trying again, please go standalone.
3879 */
3880static int drbd_do_handshake(struct drbd_conf *mdev)
3881{
3882 /* ASSERT current == mdev->receiver ... */
3883 struct p_handshake *p = &mdev->data.rbuf.handshake;
Philipp Reisner02918be2010-08-20 14:35:10 +02003884 const int expect = sizeof(struct p_handshake) - sizeof(struct p_header80);
3885 unsigned int length;
3886 enum drbd_packets cmd;
Philipp Reisnerb411b362009-09-25 16:07:19 -07003887 int rv;
3888
3889 rv = drbd_send_handshake(mdev);
3890 if (!rv)
3891 return 0;
3892
Philipp Reisner02918be2010-08-20 14:35:10 +02003893 rv = drbd_recv_header(mdev, &cmd, &length);
Philipp Reisnerb411b362009-09-25 16:07:19 -07003894 if (!rv)
3895 return 0;
3896
Philipp Reisner02918be2010-08-20 14:35:10 +02003897 if (cmd != P_HAND_SHAKE) {
Philipp Reisnerb411b362009-09-25 16:07:19 -07003898 dev_err(DEV, "expected HandShake packet, received: %s (0x%04x)\n",
Philipp Reisner02918be2010-08-20 14:35:10 +02003899 cmdname(cmd), cmd);
Philipp Reisnerb411b362009-09-25 16:07:19 -07003900 return -1;
3901 }
3902
Philipp Reisner02918be2010-08-20 14:35:10 +02003903 if (length != expect) {
Philipp Reisnerb411b362009-09-25 16:07:19 -07003904 dev_err(DEV, "expected HandShake length: %u, received: %u\n",
Philipp Reisner02918be2010-08-20 14:35:10 +02003905 expect, length);
Philipp Reisnerb411b362009-09-25 16:07:19 -07003906 return -1;
3907 }
3908
3909 rv = drbd_recv(mdev, &p->head.payload, expect);
3910
3911 if (rv != expect) {
3912 dev_err(DEV, "short read receiving handshake packet: l=%u\n", rv);
3913 return 0;
3914 }
3915
Philipp Reisnerb411b362009-09-25 16:07:19 -07003916 p->protocol_min = be32_to_cpu(p->protocol_min);
3917 p->protocol_max = be32_to_cpu(p->protocol_max);
3918 if (p->protocol_max == 0)
3919 p->protocol_max = p->protocol_min;
3920
3921 if (PRO_VERSION_MAX < p->protocol_min ||
3922 PRO_VERSION_MIN > p->protocol_max)
3923 goto incompat;
3924
3925 mdev->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max);
3926
3927 dev_info(DEV, "Handshake successful: "
3928 "Agreed network protocol version %d\n", mdev->agreed_pro_version);
3929
3930 return 1;
3931
3932 incompat:
3933 dev_err(DEV, "incompatible DRBD dialects: "
3934 "I support %d-%d, peer supports %d-%d\n",
3935 PRO_VERSION_MIN, PRO_VERSION_MAX,
3936 p->protocol_min, p->protocol_max);
3937 return -1;
3938}
3939
3940#if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE)
3941static int drbd_do_auth(struct drbd_conf *mdev)
3942{
3943 dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n");
3944 dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n");
Johannes Thomab10d96c2010-01-07 16:02:50 +01003945 return -1;
Philipp Reisnerb411b362009-09-25 16:07:19 -07003946}
3947#else
3948#define CHALLENGE_LEN 64
Johannes Thomab10d96c2010-01-07 16:02:50 +01003949
3950/* Return value:
3951 1 - auth succeeded,
3952 0 - failed, try again (network error),
3953 -1 - auth failed, don't try again.
3954*/
3955
Philipp Reisnerb411b362009-09-25 16:07:19 -07003956static int drbd_do_auth(struct drbd_conf *mdev)
3957{
3958 char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */
3959 struct scatterlist sg;
3960 char *response = NULL;
3961 char *right_response = NULL;
3962 char *peers_ch = NULL;
Philipp Reisnerb411b362009-09-25 16:07:19 -07003963 unsigned int key_len = strlen(mdev->net_conf->shared_secret);
3964 unsigned int resp_size;
3965 struct hash_desc desc;
Philipp Reisner02918be2010-08-20 14:35:10 +02003966 enum drbd_packets cmd;
3967 unsigned int length;
Philipp Reisnerb411b362009-09-25 16:07:19 -07003968 int rv;
3969
3970 desc.tfm = mdev->cram_hmac_tfm;
3971 desc.flags = 0;
3972
3973 rv = crypto_hash_setkey(mdev->cram_hmac_tfm,
3974 (u8 *)mdev->net_conf->shared_secret, key_len);
3975 if (rv) {
3976 dev_err(DEV, "crypto_hash_setkey() failed with %d\n", rv);
Johannes Thomab10d96c2010-01-07 16:02:50 +01003977 rv = -1;
Philipp Reisnerb411b362009-09-25 16:07:19 -07003978 goto fail;
3979 }
3980
3981 get_random_bytes(my_challenge, CHALLENGE_LEN);
3982
3983 rv = drbd_send_cmd2(mdev, P_AUTH_CHALLENGE, my_challenge, CHALLENGE_LEN);
3984 if (!rv)
3985 goto fail;
3986
Philipp Reisner02918be2010-08-20 14:35:10 +02003987 rv = drbd_recv_header(mdev, &cmd, &length);
Philipp Reisnerb411b362009-09-25 16:07:19 -07003988 if (!rv)
3989 goto fail;
3990
Philipp Reisner02918be2010-08-20 14:35:10 +02003991 if (cmd != P_AUTH_CHALLENGE) {
Philipp Reisnerb411b362009-09-25 16:07:19 -07003992 dev_err(DEV, "expected AuthChallenge packet, received: %s (0x%04x)\n",
Philipp Reisner02918be2010-08-20 14:35:10 +02003993 cmdname(cmd), cmd);
Philipp Reisnerb411b362009-09-25 16:07:19 -07003994 rv = 0;
3995 goto fail;
3996 }
3997
Philipp Reisner02918be2010-08-20 14:35:10 +02003998 if (length > CHALLENGE_LEN * 2) {
Philipp Reisnerb411b362009-09-25 16:07:19 -07003999 dev_err(DEV, "expected AuthChallenge payload too big.\n");
Johannes Thomab10d96c2010-01-07 16:02:50 +01004000 rv = -1;
Philipp Reisnerb411b362009-09-25 16:07:19 -07004001 goto fail;
4002 }
4003
Philipp Reisner02918be2010-08-20 14:35:10 +02004004 peers_ch = kmalloc(length, GFP_NOIO);
Philipp Reisnerb411b362009-09-25 16:07:19 -07004005 if (peers_ch == NULL) {
4006 dev_err(DEV, "kmalloc of peers_ch failed\n");
Johannes Thomab10d96c2010-01-07 16:02:50 +01004007 rv = -1;
Philipp Reisnerb411b362009-09-25 16:07:19 -07004008 goto fail;
4009 }
4010
Philipp Reisner02918be2010-08-20 14:35:10 +02004011 rv = drbd_recv(mdev, peers_ch, length);
Philipp Reisnerb411b362009-09-25 16:07:19 -07004012
Philipp Reisner02918be2010-08-20 14:35:10 +02004013 if (rv != length) {
Philipp Reisnerb411b362009-09-25 16:07:19 -07004014 dev_err(DEV, "short read AuthChallenge: l=%u\n", rv);
4015 rv = 0;
4016 goto fail;
4017 }
4018
4019 resp_size = crypto_hash_digestsize(mdev->cram_hmac_tfm);
4020 response = kmalloc(resp_size, GFP_NOIO);
4021 if (response == NULL) {
4022 dev_err(DEV, "kmalloc of response failed\n");
Johannes Thomab10d96c2010-01-07 16:02:50 +01004023 rv = -1;
Philipp Reisnerb411b362009-09-25 16:07:19 -07004024 goto fail;
4025 }
4026
4027 sg_init_table(&sg, 1);
Philipp Reisner02918be2010-08-20 14:35:10 +02004028 sg_set_buf(&sg, peers_ch, length);
Philipp Reisnerb411b362009-09-25 16:07:19 -07004029
4030 rv = crypto_hash_digest(&desc, &sg, sg.length, response);
4031 if (rv) {
4032 dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv);
Johannes Thomab10d96c2010-01-07 16:02:50 +01004033 rv = -1;
Philipp Reisnerb411b362009-09-25 16:07:19 -07004034 goto fail;
4035 }
4036
4037 rv = drbd_send_cmd2(mdev, P_AUTH_RESPONSE, response, resp_size);
4038 if (!rv)
4039 goto fail;
4040
Philipp Reisner02918be2010-08-20 14:35:10 +02004041 rv = drbd_recv_header(mdev, &cmd, &length);
Philipp Reisnerb411b362009-09-25 16:07:19 -07004042 if (!rv)
4043 goto fail;
4044
Philipp Reisner02918be2010-08-20 14:35:10 +02004045 if (cmd != P_AUTH_RESPONSE) {
Philipp Reisnerb411b362009-09-25 16:07:19 -07004046 dev_err(DEV, "expected AuthResponse packet, received: %s (0x%04x)\n",
Philipp Reisner02918be2010-08-20 14:35:10 +02004047 cmdname(cmd), cmd);
Philipp Reisnerb411b362009-09-25 16:07:19 -07004048 rv = 0;
4049 goto fail;
4050 }
4051
Philipp Reisner02918be2010-08-20 14:35:10 +02004052 if (length != resp_size) {
Philipp Reisnerb411b362009-09-25 16:07:19 -07004053 dev_err(DEV, "expected AuthResponse payload of wrong size\n");
4054 rv = 0;
4055 goto fail;
4056 }
4057
4058 rv = drbd_recv(mdev, response , resp_size);
4059
4060 if (rv != resp_size) {
4061 dev_err(DEV, "short read receiving AuthResponse: l=%u\n", rv);
4062 rv = 0;
4063 goto fail;
4064 }
4065
4066 right_response = kmalloc(resp_size, GFP_NOIO);
Julia Lawall2d1ee872009-12-27 22:27:11 +01004067 if (right_response == NULL) {
Philipp Reisnerb411b362009-09-25 16:07:19 -07004068 dev_err(DEV, "kmalloc of right_response failed\n");
Johannes Thomab10d96c2010-01-07 16:02:50 +01004069 rv = -1;
Philipp Reisnerb411b362009-09-25 16:07:19 -07004070 goto fail;
4071 }
4072
4073 sg_set_buf(&sg, my_challenge, CHALLENGE_LEN);
4074
4075 rv = crypto_hash_digest(&desc, &sg, sg.length, right_response);
4076 if (rv) {
4077 dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv);
Johannes Thomab10d96c2010-01-07 16:02:50 +01004078 rv = -1;
Philipp Reisnerb411b362009-09-25 16:07:19 -07004079 goto fail;
4080 }
4081
4082 rv = !memcmp(response, right_response, resp_size);
4083
4084 if (rv)
4085 dev_info(DEV, "Peer authenticated using %d bytes of '%s' HMAC\n",
4086 resp_size, mdev->net_conf->cram_hmac_alg);
Johannes Thomab10d96c2010-01-07 16:02:50 +01004087 else
4088 rv = -1;
Philipp Reisnerb411b362009-09-25 16:07:19 -07004089
4090 fail:
4091 kfree(peers_ch);
4092 kfree(response);
4093 kfree(right_response);
4094
4095 return rv;
4096}
4097#endif
4098
4099int drbdd_init(struct drbd_thread *thi)
4100{
4101 struct drbd_conf *mdev = thi->mdev;
4102 unsigned int minor = mdev_to_minor(mdev);
4103 int h;
4104
4105 sprintf(current->comm, "drbd%d_receiver", minor);
4106
4107 dev_info(DEV, "receiver (re)started\n");
4108
4109 do {
4110 h = drbd_connect(mdev);
4111 if (h == 0) {
4112 drbd_disconnect(mdev);
4113 __set_current_state(TASK_INTERRUPTIBLE);
4114 schedule_timeout(HZ);
4115 }
4116 if (h == -1) {
4117 dev_warn(DEV, "Discarding network configuration.\n");
4118 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
4119 }
4120 } while (h == 0);
4121
4122 if (h > 0) {
4123 if (get_net_conf(mdev)) {
4124 drbdd(mdev);
4125 put_net_conf(mdev);
4126 }
4127 }
4128
4129 drbd_disconnect(mdev);
4130
4131 dev_info(DEV, "receiver terminated\n");
4132 return 0;
4133}
4134
4135/* ********* acknowledge sender ******** */
4136
Philipp Reisner0b70a132010-08-20 13:36:10 +02004137static int got_RqSReply(struct drbd_conf *mdev, struct p_header80 *h)
Philipp Reisnerb411b362009-09-25 16:07:19 -07004138{
4139 struct p_req_state_reply *p = (struct p_req_state_reply *)h;
4140
4141 int retcode = be32_to_cpu(p->retcode);
4142
4143 if (retcode >= SS_SUCCESS) {
4144 set_bit(CL_ST_CHG_SUCCESS, &mdev->flags);
4145 } else {
4146 set_bit(CL_ST_CHG_FAIL, &mdev->flags);
4147 dev_err(DEV, "Requested state change failed by peer: %s (%d)\n",
4148 drbd_set_st_err_str(retcode), retcode);
4149 }
4150 wake_up(&mdev->state_wait);
4151
4152 return TRUE;
4153}
4154
Philipp Reisner0b70a132010-08-20 13:36:10 +02004155static int got_Ping(struct drbd_conf *mdev, struct p_header80 *h)
Philipp Reisnerb411b362009-09-25 16:07:19 -07004156{
4157 return drbd_send_ping_ack(mdev);
4158
4159}
4160
Philipp Reisner0b70a132010-08-20 13:36:10 +02004161static int got_PingAck(struct drbd_conf *mdev, struct p_header80 *h)
Philipp Reisnerb411b362009-09-25 16:07:19 -07004162{
4163 /* restore idle timeout */
4164 mdev->meta.socket->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ;
Philipp Reisner309d1602010-03-02 15:03:44 +01004165 if (!test_and_set_bit(GOT_PING_ACK, &mdev->flags))
4166 wake_up(&mdev->misc_wait);
Philipp Reisnerb411b362009-09-25 16:07:19 -07004167
4168 return TRUE;
4169}
4170
Philipp Reisner0b70a132010-08-20 13:36:10 +02004171static int got_IsInSync(struct drbd_conf *mdev, struct p_header80 *h)
Philipp Reisnerb411b362009-09-25 16:07:19 -07004172{
4173 struct p_block_ack *p = (struct p_block_ack *)h;
4174 sector_t sector = be64_to_cpu(p->sector);
4175 int blksize = be32_to_cpu(p->blksize);
4176
4177 D_ASSERT(mdev->agreed_pro_version >= 89);
4178
4179 update_peer_seq(mdev, be32_to_cpu(p->seq_num));
4180
Lars Ellenberg1d53f092010-09-05 01:13:24 +02004181 if (get_ldev(mdev)) {
4182 drbd_rs_complete_io(mdev, sector);
4183 drbd_set_in_sync(mdev, sector, blksize);
4184 /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */
4185 mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT);
4186 put_ldev(mdev);
4187 }
Philipp Reisnerb411b362009-09-25 16:07:19 -07004188 dec_rs_pending(mdev);
Philipp Reisner778f2712010-07-06 11:14:00 +02004189 atomic_add(blksize >> 9, &mdev->rs_sect_in);
Philipp Reisnerb411b362009-09-25 16:07:19 -07004190
4191 return TRUE;
4192}
4193
4194/* when we receive the ACK for a write request,
4195 * verify that we actually know about it */
4196static struct drbd_request *_ack_id_to_req(struct drbd_conf *mdev,
4197 u64 id, sector_t sector)
4198{
4199 struct hlist_head *slot = tl_hash_slot(mdev, sector);
4200 struct hlist_node *n;
4201 struct drbd_request *req;
4202
4203 hlist_for_each_entry(req, n, slot, colision) {
4204 if ((unsigned long)req == (unsigned long)id) {
4205 if (req->sector != sector) {
4206 dev_err(DEV, "_ack_id_to_req: found req %p but it has "
4207 "wrong sector (%llus versus %llus)\n", req,
4208 (unsigned long long)req->sector,
4209 (unsigned long long)sector);
4210 break;
4211 }
4212 return req;
4213 }
4214 }
4215 dev_err(DEV, "_ack_id_to_req: failed to find req %p, sector %llus in list\n",
4216 (void *)(unsigned long)id, (unsigned long long)sector);
4217 return NULL;
4218}
4219
4220typedef struct drbd_request *(req_validator_fn)
4221 (struct drbd_conf *mdev, u64 id, sector_t sector);
4222
4223static int validate_req_change_req_state(struct drbd_conf *mdev,
4224 u64 id, sector_t sector, req_validator_fn validator,
4225 const char *func, enum drbd_req_event what)
4226{
4227 struct drbd_request *req;
4228 struct bio_and_error m;
4229
4230 spin_lock_irq(&mdev->req_lock);
4231 req = validator(mdev, id, sector);
4232 if (unlikely(!req)) {
4233 spin_unlock_irq(&mdev->req_lock);
4234 dev_err(DEV, "%s: got a corrupt block_id/sector pair\n", func);
4235 return FALSE;
4236 }
4237 __req_mod(req, what, &m);
4238 spin_unlock_irq(&mdev->req_lock);
4239
4240 if (m.bio)
4241 complete_master_bio(mdev, &m);
4242 return TRUE;
4243}
4244
Philipp Reisner0b70a132010-08-20 13:36:10 +02004245static int got_BlockAck(struct drbd_conf *mdev, struct p_header80 *h)
Philipp Reisnerb411b362009-09-25 16:07:19 -07004246{
4247 struct p_block_ack *p = (struct p_block_ack *)h;
4248 sector_t sector = be64_to_cpu(p->sector);
4249 int blksize = be32_to_cpu(p->blksize);
4250 enum drbd_req_event what;
4251
4252 update_peer_seq(mdev, be32_to_cpu(p->seq_num));
4253
4254 if (is_syncer_block_id(p->block_id)) {
4255 drbd_set_in_sync(mdev, sector, blksize);
4256 dec_rs_pending(mdev);
4257 return TRUE;
4258 }
4259 switch (be16_to_cpu(h->command)) {
4260 case P_RS_WRITE_ACK:
4261 D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C);
4262 what = write_acked_by_peer_and_sis;
4263 break;
4264 case P_WRITE_ACK:
4265 D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C);
4266 what = write_acked_by_peer;
4267 break;
4268 case P_RECV_ACK:
4269 D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_B);
4270 what = recv_acked_by_peer;
4271 break;
4272 case P_DISCARD_ACK:
4273 D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C);
4274 what = conflict_discarded_by_peer;
4275 break;
4276 default:
4277 D_ASSERT(0);
4278 return FALSE;
4279 }
4280
4281 return validate_req_change_req_state(mdev, p->block_id, sector,
4282 _ack_id_to_req, __func__ , what);
4283}
4284
Philipp Reisner0b70a132010-08-20 13:36:10 +02004285static int got_NegAck(struct drbd_conf *mdev, struct p_header80 *h)
Philipp Reisnerb411b362009-09-25 16:07:19 -07004286{
4287 struct p_block_ack *p = (struct p_block_ack *)h;
4288 sector_t sector = be64_to_cpu(p->sector);
4289
4290 if (__ratelimit(&drbd_ratelimit_state))
4291 dev_warn(DEV, "Got NegAck packet. Peer is in troubles?\n");
4292
4293 update_peer_seq(mdev, be32_to_cpu(p->seq_num));
4294
4295 if (is_syncer_block_id(p->block_id)) {
4296 int size = be32_to_cpu(p->blksize);
4297 dec_rs_pending(mdev);
4298 drbd_rs_failed_io(mdev, sector, size);
4299 return TRUE;
4300 }
4301 return validate_req_change_req_state(mdev, p->block_id, sector,
4302 _ack_id_to_req, __func__ , neg_acked);
4303}
4304
Philipp Reisner0b70a132010-08-20 13:36:10 +02004305static int got_NegDReply(struct drbd_conf *mdev, struct p_header80 *h)
Philipp Reisnerb411b362009-09-25 16:07:19 -07004306{
4307 struct p_block_ack *p = (struct p_block_ack *)h;
4308 sector_t sector = be64_to_cpu(p->sector);
4309
4310 update_peer_seq(mdev, be32_to_cpu(p->seq_num));
4311 dev_err(DEV, "Got NegDReply; Sector %llus, len %u; Fail original request.\n",
4312 (unsigned long long)sector, be32_to_cpu(p->blksize));
4313
4314 return validate_req_change_req_state(mdev, p->block_id, sector,
4315 _ar_id_to_req, __func__ , neg_acked);
4316}
4317
Philipp Reisner0b70a132010-08-20 13:36:10 +02004318static int got_NegRSDReply(struct drbd_conf *mdev, struct p_header80 *h)
Philipp Reisnerb411b362009-09-25 16:07:19 -07004319{
4320 sector_t sector;
4321 int size;
4322 struct p_block_ack *p = (struct p_block_ack *)h;
4323
4324 sector = be64_to_cpu(p->sector);
4325 size = be32_to_cpu(p->blksize);
Philipp Reisnerb411b362009-09-25 16:07:19 -07004326
4327 update_peer_seq(mdev, be32_to_cpu(p->seq_num));
4328
4329 dec_rs_pending(mdev);
4330
4331 if (get_ldev_if_state(mdev, D_FAILED)) {
4332 drbd_rs_complete_io(mdev, sector);
4333 drbd_rs_failed_io(mdev, sector, size);
4334 put_ldev(mdev);
4335 }
4336
4337 return TRUE;
4338}
4339
Philipp Reisner0b70a132010-08-20 13:36:10 +02004340static int got_BarrierAck(struct drbd_conf *mdev, struct p_header80 *h)
Philipp Reisnerb411b362009-09-25 16:07:19 -07004341{
4342 struct p_barrier_ack *p = (struct p_barrier_ack *)h;
4343
4344 tl_release(mdev, p->barrier, be32_to_cpu(p->set_size));
4345
Philipp Reisnerc4752ef2010-10-27 17:32:36 +02004346 if (mdev->state.conn == C_AHEAD &&
4347 atomic_read(&mdev->ap_in_flight) == 0 &&
4348 list_empty(&mdev->start_resync_work.list)) {
4349 struct drbd_work *w = &mdev->start_resync_work;
4350 w->cb = w_start_resync;
4351 drbd_queue_work_front(&mdev->data.work, w);
4352 }
4353
Philipp Reisnerb411b362009-09-25 16:07:19 -07004354 return TRUE;
4355}
4356
Philipp Reisner0b70a132010-08-20 13:36:10 +02004357static int got_OVResult(struct drbd_conf *mdev, struct p_header80 *h)
Philipp Reisnerb411b362009-09-25 16:07:19 -07004358{
4359 struct p_block_ack *p = (struct p_block_ack *)h;
4360 struct drbd_work *w;
4361 sector_t sector;
4362 int size;
4363
4364 sector = be64_to_cpu(p->sector);
4365 size = be32_to_cpu(p->blksize);
4366
4367 update_peer_seq(mdev, be32_to_cpu(p->seq_num));
4368
4369 if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC)
4370 drbd_ov_oos_found(mdev, sector, size);
4371 else
4372 ov_oos_print(mdev);
4373
Lars Ellenberg1d53f092010-09-05 01:13:24 +02004374 if (!get_ldev(mdev))
4375 return TRUE;
4376
Philipp Reisnerb411b362009-09-25 16:07:19 -07004377 drbd_rs_complete_io(mdev, sector);
4378 dec_rs_pending(mdev);
4379
Lars Ellenbergea5442a2010-11-05 09:48:01 +01004380 --mdev->ov_left;
4381
4382 /* let's advance progress step marks only for every other megabyte */
4383 if ((mdev->ov_left & 0x200) == 0x200)
4384 drbd_advance_rs_marks(mdev, mdev->ov_left);
4385
4386 if (mdev->ov_left == 0) {
Philipp Reisnerb411b362009-09-25 16:07:19 -07004387 w = kmalloc(sizeof(*w), GFP_NOIO);
4388 if (w) {
4389 w->cb = w_ov_finished;
4390 drbd_queue_work_front(&mdev->data.work, w);
4391 } else {
4392 dev_err(DEV, "kmalloc(w) failed.");
4393 ov_oos_print(mdev);
4394 drbd_resync_finished(mdev);
4395 }
4396 }
Lars Ellenberg1d53f092010-09-05 01:13:24 +02004397 put_ldev(mdev);
Philipp Reisnerb411b362009-09-25 16:07:19 -07004398 return TRUE;
4399}
4400
Philipp Reisner02918be2010-08-20 14:35:10 +02004401static int got_skip(struct drbd_conf *mdev, struct p_header80 *h)
Philipp Reisner0ced55a2010-04-30 15:26:20 +02004402{
Philipp Reisner0ced55a2010-04-30 15:26:20 +02004403 return TRUE;
4404}
4405
Philipp Reisnerb411b362009-09-25 16:07:19 -07004406struct asender_cmd {
4407 size_t pkt_size;
Philipp Reisner0b70a132010-08-20 13:36:10 +02004408 int (*process)(struct drbd_conf *mdev, struct p_header80 *h);
Philipp Reisnerb411b362009-09-25 16:07:19 -07004409};
4410
4411static struct asender_cmd *get_asender_cmd(int cmd)
4412{
4413 static struct asender_cmd asender_tbl[] = {
4414 /* anything missing from this table is in
4415 * the drbd_cmd_handler (drbd_default_handler) table,
4416 * see the beginning of drbdd() */
Philipp Reisner0b70a132010-08-20 13:36:10 +02004417 [P_PING] = { sizeof(struct p_header80), got_Ping },
4418 [P_PING_ACK] = { sizeof(struct p_header80), got_PingAck },
Philipp Reisnerb411b362009-09-25 16:07:19 -07004419 [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck },
4420 [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck },
4421 [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck },
4422 [P_DISCARD_ACK] = { sizeof(struct p_block_ack), got_BlockAck },
4423 [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck },
4424 [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply },
4425 [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply},
4426 [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult },
4427 [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck },
4428 [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply },
4429 [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync },
Philipp Reisner02918be2010-08-20 14:35:10 +02004430 [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip },
Philipp Reisnerb411b362009-09-25 16:07:19 -07004431 [P_MAX_CMD] = { 0, NULL },
4432 };
4433 if (cmd > P_MAX_CMD || asender_tbl[cmd].process == NULL)
4434 return NULL;
4435 return &asender_tbl[cmd];
4436}
4437
4438int drbd_asender(struct drbd_thread *thi)
4439{
4440 struct drbd_conf *mdev = thi->mdev;
Philipp Reisner02918be2010-08-20 14:35:10 +02004441 struct p_header80 *h = &mdev->meta.rbuf.header.h80;
Philipp Reisnerb411b362009-09-25 16:07:19 -07004442 struct asender_cmd *cmd = NULL;
4443
4444 int rv, len;
4445 void *buf = h;
4446 int received = 0;
Philipp Reisner0b70a132010-08-20 13:36:10 +02004447 int expect = sizeof(struct p_header80);
Philipp Reisnerb411b362009-09-25 16:07:19 -07004448 int empty;
4449
4450 sprintf(current->comm, "drbd%d_asender", mdev_to_minor(mdev));
4451
4452 current->policy = SCHED_RR; /* Make this a realtime task! */
4453 current->rt_priority = 2; /* more important than all other tasks */
4454
4455 while (get_t_state(thi) == Running) {
4456 drbd_thread_current_set_cpu(mdev);
4457 if (test_and_clear_bit(SEND_PING, &mdev->flags)) {
4458 ERR_IF(!drbd_send_ping(mdev)) goto reconnect;
4459 mdev->meta.socket->sk->sk_rcvtimeo =
4460 mdev->net_conf->ping_timeo*HZ/10;
4461 }
4462
4463 /* conditionally cork;
4464 * it may hurt latency if we cork without much to send */
4465 if (!mdev->net_conf->no_cork &&
4466 3 < atomic_read(&mdev->unacked_cnt))
4467 drbd_tcp_cork(mdev->meta.socket);
4468 while (1) {
4469 clear_bit(SIGNAL_ASENDER, &mdev->flags);
4470 flush_signals(current);
Lars Ellenberg0f8488e2010-10-13 18:19:23 +02004471 if (!drbd_process_done_ee(mdev))
Philipp Reisnerb411b362009-09-25 16:07:19 -07004472 goto reconnect;
Philipp Reisnerb411b362009-09-25 16:07:19 -07004473 /* to avoid race with newly queued ACKs */
4474 set_bit(SIGNAL_ASENDER, &mdev->flags);
4475 spin_lock_irq(&mdev->req_lock);
4476 empty = list_empty(&mdev->done_ee);
4477 spin_unlock_irq(&mdev->req_lock);
4478 /* new ack may have been queued right here,
4479 * but then there is also a signal pending,
4480 * and we start over... */
4481 if (empty)
4482 break;
4483 }
4484 /* but unconditionally uncork unless disabled */
4485 if (!mdev->net_conf->no_cork)
4486 drbd_tcp_uncork(mdev->meta.socket);
4487
4488 /* short circuit, recv_msg would return EINTR anyways. */
4489 if (signal_pending(current))
4490 continue;
4491
4492 rv = drbd_recv_short(mdev, mdev->meta.socket,
4493 buf, expect-received, 0);
4494 clear_bit(SIGNAL_ASENDER, &mdev->flags);
4495
4496 flush_signals(current);
4497
4498 /* Note:
4499 * -EINTR (on meta) we got a signal
4500 * -EAGAIN (on meta) rcvtimeo expired
4501 * -ECONNRESET other side closed the connection
4502 * -ERESTARTSYS (on data) we got a signal
4503 * rv < 0 other than above: unexpected error!
4504 * rv == expected: full header or command
4505 * rv < expected: "woken" by signal during receive
4506 * rv == 0 : "connection shut down by peer"
4507 */
4508 if (likely(rv > 0)) {
4509 received += rv;
4510 buf += rv;
4511 } else if (rv == 0) {
4512 dev_err(DEV, "meta connection shut down by peer.\n");
4513 goto reconnect;
4514 } else if (rv == -EAGAIN) {
4515 if (mdev->meta.socket->sk->sk_rcvtimeo ==
4516 mdev->net_conf->ping_timeo*HZ/10) {
4517 dev_err(DEV, "PingAck did not arrive in time.\n");
4518 goto reconnect;
4519 }
4520 set_bit(SEND_PING, &mdev->flags);
4521 continue;
4522 } else if (rv == -EINTR) {
4523 continue;
4524 } else {
4525 dev_err(DEV, "sock_recvmsg returned %d\n", rv);
4526 goto reconnect;
4527 }
4528
4529 if (received == expect && cmd == NULL) {
4530 if (unlikely(h->magic != BE_DRBD_MAGIC)) {
Lars Ellenberg004352f2010-10-05 20:13:58 +02004531 dev_err(DEV, "magic?? on meta m: 0x%08x c: %d l: %d\n",
4532 be32_to_cpu(h->magic),
4533 be16_to_cpu(h->command),
4534 be16_to_cpu(h->length));
Philipp Reisnerb411b362009-09-25 16:07:19 -07004535 goto reconnect;
4536 }
4537 cmd = get_asender_cmd(be16_to_cpu(h->command));
4538 len = be16_to_cpu(h->length);
4539 if (unlikely(cmd == NULL)) {
Lars Ellenberg004352f2010-10-05 20:13:58 +02004540 dev_err(DEV, "unknown command?? on meta m: 0x%08x c: %d l: %d\n",
4541 be32_to_cpu(h->magic),
4542 be16_to_cpu(h->command),
4543 be16_to_cpu(h->length));
Philipp Reisnerb411b362009-09-25 16:07:19 -07004544 goto disconnect;
4545 }
4546 expect = cmd->pkt_size;
Philipp Reisner0b70a132010-08-20 13:36:10 +02004547 ERR_IF(len != expect-sizeof(struct p_header80))
Philipp Reisnerb411b362009-09-25 16:07:19 -07004548 goto reconnect;
Philipp Reisnerb411b362009-09-25 16:07:19 -07004549 }
4550 if (received == expect) {
4551 D_ASSERT(cmd != NULL);
Philipp Reisnerb411b362009-09-25 16:07:19 -07004552 if (!cmd->process(mdev, h))
4553 goto reconnect;
4554
4555 buf = h;
4556 received = 0;
Philipp Reisner0b70a132010-08-20 13:36:10 +02004557 expect = sizeof(struct p_header80);
Philipp Reisnerb411b362009-09-25 16:07:19 -07004558 cmd = NULL;
4559 }
4560 }
4561
4562 if (0) {
4563reconnect:
4564 drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE));
Lars Ellenberg856c50c2010-10-14 13:37:40 +02004565 drbd_md_sync(mdev);
Philipp Reisnerb411b362009-09-25 16:07:19 -07004566 }
4567 if (0) {
4568disconnect:
4569 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
Lars Ellenberg856c50c2010-10-14 13:37:40 +02004570 drbd_md_sync(mdev);
Philipp Reisnerb411b362009-09-25 16:07:19 -07004571 }
4572 clear_bit(SIGNAL_ASENDER, &mdev->flags);
4573
4574 D_ASSERT(mdev->state.conn < C_CONNECTED);
4575 dev_info(DEV, "asender terminated\n");
4576
4577 return 0;
4578}