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drbd: add missing drbd command names to avoid <NULL> in error messages
[net-next-2.6.git] / drivers / block / drbd / drbd_receiver.c
CommitLineData
b411b363
PR		 1/*
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
b411b363
PR		 26#include <linux/module.h>
27
28#include <asm/uaccess.h>
29#include <net/sock.h>
30
b411b363
PR		 31#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>
39#include <linux/smp_lock.h>
40#include <linux/pkt_sched.h>
41#define __KERNEL_SYSCALLS__
42#include <linux/unistd.h>
43#include <linux/vmalloc.h>
44#include <linux/random.h>
45#include <linux/mm.h>
46#include <linux/string.h>
47#include <linux/scatterlist.h>
48#include "drbd_int.h"
b411b363
PR		 49#include "drbd_req.h"
50
51#include "drbd_vli.h"
52
53struct flush_work {
54 struct drbd_work w;
55 struct drbd_epoch *epoch;
56};
57
58enum finish_epoch {
59 FE_STILL_LIVE,
60 FE_DESTROYED,
61 FE_RECYCLED,
62};
63
64static int drbd_do_handshake(struct drbd_conf *mdev);
65static int drbd_do_auth(struct drbd_conf *mdev);
66
67static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *, struct drbd_epoch *, enum epoch_event);
68static int e_end_block(struct drbd_conf *, struct drbd_work *, int);
69
70static struct drbd_epoch *previous_epoch(struct drbd_conf *mdev, struct drbd_epoch *epoch)
71{
72 struct drbd_epoch *prev;
73 spin_lock(&mdev->epoch_lock);
74 prev = list_entry(epoch->list.prev, struct drbd_epoch, list);
75 if (prev == epoch || prev == mdev->current_epoch)
76 prev = NULL;
77 spin_unlock(&mdev->epoch_lock);
78 return prev;
79}
80
81#define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN)
82
83static struct page *drbd_pp_first_page_or_try_alloc(struct drbd_conf *mdev)
84{
85 struct page *page = NULL;
86
87 /* Yes, testing drbd_pp_vacant outside the lock is racy.
88 * So what. It saves a spin_lock. */
89 if (drbd_pp_vacant > 0) {
90 spin_lock(&drbd_pp_lock);
91 page = drbd_pp_pool;
92 if (page) {
93 drbd_pp_pool = (struct page *)page_private(page);
94 set_page_private(page, 0); /* just to be polite */
95 drbd_pp_vacant--;
96 }
97 spin_unlock(&drbd_pp_lock);
98 }
99 /* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD
100 * "criss-cross" setup, that might cause write-out on some other DRBD,
101 * which in turn might block on the other node at this very place. */
102 if (!page)
103 page = alloc_page(GFP_TRY);
104 if (page)
105 atomic_inc(&mdev->pp_in_use);
106 return page;
107}
108
109/* kick lower level device, if we have more than (arbitrary number)
110 * reference counts on it, which typically are locally submitted io
111 * requests. don't use unacked_cnt, so we speed up proto A and B, too. */
112static void maybe_kick_lo(struct drbd_conf *mdev)
113{
114 if (atomic_read(&mdev->local_cnt) >= mdev->net_conf->unplug_watermark)
115 drbd_kick_lo(mdev);
116}
117
118static void reclaim_net_ee(struct drbd_conf *mdev, struct list_head *to_be_freed)
119{
120 struct drbd_epoch_entry *e;
121 struct list_head *le, *tle;
122
123 /* The EEs are always appended to the end of the list. Since
124 they are sent in order over the wire, they have to finish
125 in order. As soon as we see the first not finished we can
126 stop to examine the list... */
127
128 list_for_each_safe(le, tle, &mdev->net_ee) {
129 e = list_entry(le, struct drbd_epoch_entry, w.list);
130 if (drbd_bio_has_active_page(e->private_bio))
131 break;
132 list_move(le, to_be_freed);
133 }
134}
135
136static void drbd_kick_lo_and_reclaim_net(struct drbd_conf *mdev)
137{
138 LIST_HEAD(reclaimed);
139 struct drbd_epoch_entry *e, *t;
140
141 maybe_kick_lo(mdev);
142 spin_lock_irq(&mdev->req_lock);
143 reclaim_net_ee(mdev, &reclaimed);
144 spin_unlock_irq(&mdev->req_lock);
145
146 list_for_each_entry_safe(e, t, &reclaimed, w.list)
147 drbd_free_ee(mdev, e);
148}
149
150/**
151 * drbd_pp_alloc() - Returns a page, fails only if a signal comes in
152 * @mdev: DRBD device.
153 * @retry: whether or not to retry allocation forever (or until signalled)
154 *
155 * Tries to allocate a page, first from our own page pool, then from the
156 * kernel, unless this allocation would exceed the max_buffers setting.
157 * If @retry is non-zero, retry until DRBD frees a page somewhere else.
158 */
159static struct page *drbd_pp_alloc(struct drbd_conf *mdev, int retry)
160{
161 struct page *page = NULL;
162 DEFINE_WAIT(wait);
163
164 if (atomic_read(&mdev->pp_in_use) < mdev->net_conf->max_buffers) {
165 page = drbd_pp_first_page_or_try_alloc(mdev);
166 if (page)
167 return page;
168 }
169
170 for (;;) {
171 prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE);
172
173 drbd_kick_lo_and_reclaim_net(mdev);
174
175 if (atomic_read(&mdev->pp_in_use) < mdev->net_conf->max_buffers) {
176 page = drbd_pp_first_page_or_try_alloc(mdev);
177 if (page)
178 break;
179 }
180
181 if (!retry)
182 break;
183
184 if (signal_pending(current)) {
185 dev_warn(DEV, "drbd_pp_alloc interrupted!\n");
186 break;
187 }
188
189 schedule();
190 }
191 finish_wait(&drbd_pp_wait, &wait);
192
193 return page;
194}
195
196/* Must not be used from irq, as that may deadlock: see drbd_pp_alloc.
197 * Is also used from inside an other spin_lock_irq(&mdev->req_lock) */
198static void drbd_pp_free(struct drbd_conf *mdev, struct page *page)
199{
200 int free_it;
201
202 spin_lock(&drbd_pp_lock);
203 if (drbd_pp_vacant > (DRBD_MAX_SEGMENT_SIZE/PAGE_SIZE)*minor_count) {
204 free_it = 1;
205 } else {
206 set_page_private(page, (unsigned long)drbd_pp_pool);
207 drbd_pp_pool = page;
208 drbd_pp_vacant++;
209 free_it = 0;
210 }
211 spin_unlock(&drbd_pp_lock);
212
213 atomic_dec(&mdev->pp_in_use);
214
215 if (free_it)
216 __free_page(page);
217
218 wake_up(&drbd_pp_wait);
219}
220
221static void drbd_pp_free_bio_pages(struct drbd_conf *mdev, struct bio *bio)
222{
223 struct page *p_to_be_freed = NULL;
224 struct page *page;
225 struct bio_vec *bvec;
226 int i;
227
228 spin_lock(&drbd_pp_lock);
229 __bio_for_each_segment(bvec, bio, i, 0) {
230 if (drbd_pp_vacant > (DRBD_MAX_SEGMENT_SIZE/PAGE_SIZE)*minor_count) {
231 set_page_private(bvec->bv_page, (unsigned long)p_to_be_freed);
232 p_to_be_freed = bvec->bv_page;
233 } else {
234 set_page_private(bvec->bv_page, (unsigned long)drbd_pp_pool);
235 drbd_pp_pool = bvec->bv_page;
236 drbd_pp_vacant++;
237 }
238 }
239 spin_unlock(&drbd_pp_lock);
240 atomic_sub(bio->bi_vcnt, &mdev->pp_in_use);
241
242 while (p_to_be_freed) {
243 page = p_to_be_freed;
244 p_to_be_freed = (struct page *)page_private(page);
245 set_page_private(page, 0); /* just to be polite */
246 put_page(page);
247 }
248
249 wake_up(&drbd_pp_wait);
250}
251
252/*
253You need to hold the req_lock:
254 _drbd_wait_ee_list_empty()
255
256You must not have the req_lock:
257 drbd_free_ee()
258 drbd_alloc_ee()
259 drbd_init_ee()
260 drbd_release_ee()
261 drbd_ee_fix_bhs()
262 drbd_process_done_ee()
263 drbd_clear_done_ee()
264 drbd_wait_ee_list_empty()
265*/
266
267struct drbd_epoch_entry *drbd_alloc_ee(struct drbd_conf *mdev,
268 u64 id,
269 sector_t sector,
270 unsigned int data_size,
271 gfp_t gfp_mask) __must_hold(local)
272{
273 struct request_queue *q;
274 struct drbd_epoch_entry *e;
275 struct page *page;
276 struct bio *bio;
277 unsigned int ds;
278
279 if (FAULT_ACTIVE(mdev, DRBD_FAULT_AL_EE))
280 return NULL;
281
282 e = mempool_alloc(drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM);
283 if (!e) {
284 if (!(gfp_mask & __GFP_NOWARN))
285 dev_err(DEV, "alloc_ee: Allocation of an EE failed\n");
286 return NULL;
287 }
288
289 bio = bio_alloc(gfp_mask & ~__GFP_HIGHMEM, div_ceil(data_size, PAGE_SIZE));
290 if (!bio) {
291 if (!(gfp_mask & __GFP_NOWARN))
292 dev_err(DEV, "alloc_ee: Allocation of a bio failed\n");
293 goto fail1;
294 }
295
296 bio->bi_bdev = mdev->ldev->backing_bdev;
297 bio->bi_sector = sector;
298
299 ds = data_size;
300 while (ds) {
301 page = drbd_pp_alloc(mdev, (gfp_mask & __GFP_WAIT));
302 if (!page) {
303 if (!(gfp_mask & __GFP_NOWARN))
304 dev_err(DEV, "alloc_ee: Allocation of a page failed\n");
305 goto fail2;
306 }
307 if (!bio_add_page(bio, page, min_t(int, ds, PAGE_SIZE), 0)) {
308 drbd_pp_free(mdev, page);
309 dev_err(DEV, "alloc_ee: bio_add_page(s=%llu,"
310 "data_size=%u,ds=%u) failed\n",
311 (unsigned long long)sector, data_size, ds);
312
313 q = bdev_get_queue(bio->bi_bdev);
314 if (q->merge_bvec_fn) {
315 struct bvec_merge_data bvm = {
316 .bi_bdev = bio->bi_bdev,
317 .bi_sector = bio->bi_sector,
318 .bi_size = bio->bi_size,
319 .bi_rw = bio->bi_rw,
320 };
321 int l = q->merge_bvec_fn(q, &bvm,
322 &bio->bi_io_vec[bio->bi_vcnt]);
323 dev_err(DEV, "merge_bvec_fn() = %d\n", l);
324 }
325
326 /* dump more of the bio. */
327 dev_err(DEV, "bio->bi_max_vecs = %d\n", bio->bi_max_vecs);
328 dev_err(DEV, "bio->bi_vcnt = %d\n", bio->bi_vcnt);
329 dev_err(DEV, "bio->bi_size = %d\n", bio->bi_size);
330 dev_err(DEV, "bio->bi_phys_segments = %d\n", bio->bi_phys_segments);
331
332 goto fail2;
333 break;
334 }
335 ds -= min_t(int, ds, PAGE_SIZE);
336 }
337
338 D_ASSERT(data_size == bio->bi_size);
339
340 bio->bi_private = e;
341 e->mdev = mdev;
342 e->sector = sector;
343 e->size = bio->bi_size;
344
345 e->private_bio = bio;
346 e->block_id = id;
347 INIT_HLIST_NODE(&e->colision);
348 e->epoch = NULL;
349 e->flags = 0;
350
b411b363
PR		 351 return e;
352
353 fail2:
354 drbd_pp_free_bio_pages(mdev, bio);
355 bio_put(bio);
356 fail1:
357 mempool_free(e, drbd_ee_mempool);
358
359 return NULL;
360}
361
362void drbd_free_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e)
363{
364 struct bio *bio = e->private_bio;
b411b363
PR		 365 drbd_pp_free_bio_pages(mdev, bio);
366 bio_put(bio);
367 D_ASSERT(hlist_unhashed(&e->colision));
368 mempool_free(e, drbd_ee_mempool);
369}
370
371int drbd_release_ee(struct drbd_conf *mdev, struct list_head *list)
372{
373 LIST_HEAD(work_list);
374 struct drbd_epoch_entry *e, *t;
375 int count = 0;
376
377 spin_lock_irq(&mdev->req_lock);
378 list_splice_init(list, &work_list);
379 spin_unlock_irq(&mdev->req_lock);
380
381 list_for_each_entry_safe(e, t, &work_list, w.list) {
382 drbd_free_ee(mdev, e);
383 count++;
384 }
385 return count;
386}
387
388
389/*
390 * This function is called from _asender only_
391 * but see also comments in _req_mod(,barrier_acked)
392 * and receive_Barrier.
393 *
394 * Move entries from net_ee to done_ee, if ready.
395 * Grab done_ee, call all callbacks, free the entries.
396 * The callbacks typically send out ACKs.
397 */
398static int drbd_process_done_ee(struct drbd_conf *mdev)
399{
400 LIST_HEAD(work_list);
401 LIST_HEAD(reclaimed);
402 struct drbd_epoch_entry *e, *t;
403 int ok = (mdev->state.conn >= C_WF_REPORT_PARAMS);
404
405 spin_lock_irq(&mdev->req_lock);
406 reclaim_net_ee(mdev, &reclaimed);
407 list_splice_init(&mdev->done_ee, &work_list);
408 spin_unlock_irq(&mdev->req_lock);
409
410 list_for_each_entry_safe(e, t, &reclaimed, w.list)
411 drbd_free_ee(mdev, e);
412
413 /* possible callbacks here:
414 * e_end_block, and e_end_resync_block, e_send_discard_ack.
415 * all ignore the last argument.
416 */
417 list_for_each_entry_safe(e, t, &work_list, w.list) {
b411b363
PR		 418 /* list_del not necessary, next/prev members not touched */
419 ok = e->w.cb(mdev, &e->w, !ok) && ok;
420 drbd_free_ee(mdev, e);
421 }
422 wake_up(&mdev->ee_wait);
423
424 return ok;
425}
426
427void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head)
428{
429 DEFINE_WAIT(wait);
430
431 /* avoids spin_lock/unlock
432 * and calling prepare_to_wait in the fast path */
433 while (!list_empty(head)) {
434 prepare_to_wait(&mdev->ee_wait, &wait, TASK_UNINTERRUPTIBLE);
435 spin_unlock_irq(&mdev->req_lock);
436 drbd_kick_lo(mdev);
437 schedule();
438 finish_wait(&mdev->ee_wait, &wait);
439 spin_lock_irq(&mdev->req_lock);
440 }
441}
442
443void drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head)
444{
445 spin_lock_irq(&mdev->req_lock);
446 _drbd_wait_ee_list_empty(mdev, head);
447 spin_unlock_irq(&mdev->req_lock);
448}
449
450/* see also kernel_accept; which is only present since 2.6.18.
451 * also we want to log which part of it failed, exactly */
452static int drbd_accept(struct drbd_conf *mdev, const char **what,
453 struct socket *sock, struct socket **newsock)
454{
455 struct sock *sk = sock->sk;
456 int err = 0;
457
458 *what = "listen";
459 err = sock->ops->listen(sock, 5);
460 if (err < 0)
461 goto out;
462
463 *what = "sock_create_lite";
464 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
465 newsock);
466 if (err < 0)
467 goto out;
468
469 *what = "accept";
470 err = sock->ops->accept(sock, *newsock, 0);
471 if (err < 0) {
472 sock_release(*newsock);
473 *newsock = NULL;
474 goto out;
475 }
476 (*newsock)->ops = sock->ops;
477
478out:
479 return err;
480}
481
482static int drbd_recv_short(struct drbd_conf *mdev, struct socket *sock,
483 void *buf, size_t size, int flags)
484{
485 mm_segment_t oldfs;
486 struct kvec iov = {
487 .iov_base = buf,
488 .iov_len = size,
489 };
490 struct msghdr msg = {
491 .msg_iovlen = 1,
492 .msg_iov = (struct iovec *)&iov,
493 .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL)
494 };
495 int rv;
496
497 oldfs = get_fs();
498 set_fs(KERNEL_DS);
499 rv = sock_recvmsg(sock, &msg, size, msg.msg_flags);
500 set_fs(oldfs);
501
502 return rv;
503}
504
505static int drbd_recv(struct drbd_conf *mdev, void *buf, size_t size)
506{
507 mm_segment_t oldfs;
508 struct kvec iov = {
509 .iov_base = buf,
510 .iov_len = size,
511 };
512 struct msghdr msg = {
513 .msg_iovlen = 1,
514 .msg_iov = (struct iovec *)&iov,
515 .msg_flags = MSG_WAITALL | MSG_NOSIGNAL
516 };
517 int rv;
518
519 oldfs = get_fs();
520 set_fs(KERNEL_DS);
521
522 for (;;) {
523 rv = sock_recvmsg(mdev->data.socket, &msg, size, msg.msg_flags);
524 if (rv == size)
525 break;
526
527 /* Note:
528 * ECONNRESET other side closed the connection
529 * ERESTARTSYS (on sock) we got a signal
530 */
531
532 if (rv < 0) {
533 if (rv == -ECONNRESET)
534 dev_info(DEV, "sock was reset by peer\n");
535 else if (rv != -ERESTARTSYS)
536 dev_err(DEV, "sock_recvmsg returned %d\n", rv);
537 break;
538 } else if (rv == 0) {
539 dev_info(DEV, "sock was shut down by peer\n");
540 break;
541 } else {
542 /* signal came in, or peer/link went down,
543 * after we read a partial message
544 */
545 /* D_ASSERT(signal_pending(current)); */
546 break;
547 }
548 };
549
550 set_fs(oldfs);
551
552 if (rv != size)
553 drbd_force_state(mdev, NS(conn, C_BROKEN_PIPE));
554
555 return rv;
556}
557
558static struct socket *drbd_try_connect(struct drbd_conf *mdev)
559{
560 const char *what;
561 struct socket *sock;
562 struct sockaddr_in6 src_in6;
563 int err;
564 int disconnect_on_error = 1;
565
566 if (!get_net_conf(mdev))
567 return NULL;
568
569 what = "sock_create_kern";
570 err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family,
571 SOCK_STREAM, IPPROTO_TCP, &sock);
572 if (err < 0) {
573 sock = NULL;
574 goto out;
575 }
576
577 sock->sk->sk_rcvtimeo =
578 sock->sk->sk_sndtimeo = mdev->net_conf->try_connect_int*HZ;
579
580 /* explicitly bind to the configured IP as source IP
581 * for the outgoing connections.
582 * This is needed for multihomed hosts and to be
583 * able to use lo: interfaces for drbd.
584 * Make sure to use 0 as port number, so linux selects
585 * a free one dynamically.
586 */
587 memcpy(&src_in6, mdev->net_conf->my_addr,
588 min_t(int, mdev->net_conf->my_addr_len, sizeof(src_in6)));
589 if (((struct sockaddr *)mdev->net_conf->my_addr)->sa_family == AF_INET6)
590 src_in6.sin6_port = 0;
591 else
592 ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */
593
594 what = "bind before connect";
595 err = sock->ops->bind(sock,
596 (struct sockaddr *) &src_in6,
597 mdev->net_conf->my_addr_len);
598 if (err < 0)
599 goto out;
600
601 /* connect may fail, peer not yet available.
602 * stay C_WF_CONNECTION, don't go Disconnecting! */
603 disconnect_on_error = 0;
604 what = "connect";
605 err = sock->ops->connect(sock,
606 (struct sockaddr *)mdev->net_conf->peer_addr,
607 mdev->net_conf->peer_addr_len, 0);
608
609out:
610 if (err < 0) {
611 if (sock) {
612 sock_release(sock);
613 sock = NULL;
614 }
615 switch (-err) {
616 /* timeout, busy, signal pending */
617 case ETIMEDOUT: case EAGAIN: case EINPROGRESS:
618 case EINTR: case ERESTARTSYS:
619 /* peer not (yet) available, network problem */
620 case ECONNREFUSED: case ENETUNREACH:
621 case EHOSTDOWN: case EHOSTUNREACH:
622 disconnect_on_error = 0;
623 break;
624 default:
625 dev_err(DEV, "%s failed, err = %d\n", what, err);
626 }
627 if (disconnect_on_error)
628 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
629 }
630 put_net_conf(mdev);
631 return sock;
632}
633
634static struct socket *drbd_wait_for_connect(struct drbd_conf *mdev)
635{
636 int timeo, err;
637 struct socket *s_estab = NULL, *s_listen;
638 const char *what;
639
640 if (!get_net_conf(mdev))
641 return NULL;
642
643 what = "sock_create_kern";
644 err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family,
645 SOCK_STREAM, IPPROTO_TCP, &s_listen);
646 if (err) {
647 s_listen = NULL;
648 goto out;
649 }
650
651 timeo = mdev->net_conf->try_connect_int * HZ;
652 timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */
653
654 s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */
655 s_listen->sk->sk_rcvtimeo = timeo;
656 s_listen->sk->sk_sndtimeo = timeo;
657
658 what = "bind before listen";
659 err = s_listen->ops->bind(s_listen,
660 (struct sockaddr *) mdev->net_conf->my_addr,
661 mdev->net_conf->my_addr_len);
662 if (err < 0)
663 goto out;
664
665 err = drbd_accept(mdev, &what, s_listen, &s_estab);
666
667out:
668 if (s_listen)
669 sock_release(s_listen);
670 if (err < 0) {
671 if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) {
672 dev_err(DEV, "%s failed, err = %d\n", what, err);
673 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
674 }
675 }
676 put_net_conf(mdev);
677
678 return s_estab;
679}
680
681static int drbd_send_fp(struct drbd_conf *mdev,
682 struct socket *sock, enum drbd_packets cmd)
683{
684 struct p_header *h = (struct p_header *) &mdev->data.sbuf.header;
685
686 return _drbd_send_cmd(mdev, sock, cmd, h, sizeof(*h), 0);
687}
688
689static enum drbd_packets drbd_recv_fp(struct drbd_conf *mdev, struct socket *sock)
690{
691 struct p_header *h = (struct p_header *) &mdev->data.sbuf.header;
692 int rr;
693
694 rr = drbd_recv_short(mdev, sock, h, sizeof(*h), 0);
695
696 if (rr == sizeof(*h) && h->magic == BE_DRBD_MAGIC)
697 return be16_to_cpu(h->command);
698
699 return 0xffff;
700}
701
702/**
703 * drbd_socket_okay() - Free the socket if its connection is not okay
704 * @mdev: DRBD device.
705 * @sock: pointer to the pointer to the socket.
706 */
707static int drbd_socket_okay(struct drbd_conf *mdev, struct socket **sock)
708{
709 int rr;
710 char tb[4];
711
712 if (!*sock)
713 return FALSE;
714
715 rr = drbd_recv_short(mdev, *sock, tb, 4, MSG_DONTWAIT | MSG_PEEK);
716
717 if (rr > 0 || rr == -EAGAIN) {
718 return TRUE;
719 } else {
720 sock_release(*sock);
721 *sock = NULL;
722 return FALSE;
723 }
724}
725
726/*
727 * return values:
728 * 1 yes, we have a valid connection
729 * 0 oops, did not work out, please try again
730 * -1 peer talks different language,
731 * no point in trying again, please go standalone.
732 * -2 We do not have a network config...
733 */
734static int drbd_connect(struct drbd_conf *mdev)
735{
736 struct socket *s, *sock, *msock;
737 int try, h, ok;
738
739 D_ASSERT(!mdev->data.socket);
740
741 if (test_and_clear_bit(CREATE_BARRIER, &mdev->flags))
742 dev_err(DEV, "CREATE_BARRIER flag was set in drbd_connect - now cleared!\n");
743
744 if (drbd_request_state(mdev, NS(conn, C_WF_CONNECTION)) < SS_SUCCESS)
745 return -2;
746
747 clear_bit(DISCARD_CONCURRENT, &mdev->flags);
748
749 sock = NULL;
750 msock = NULL;
751
752 do {
753 for (try = 0;;) {
754 /* 3 tries, this should take less than a second! */
755 s = drbd_try_connect(mdev);
756 if (s || ++try >= 3)
757 break;
758 /* give the other side time to call bind() & listen() */
759 __set_current_state(TASK_INTERRUPTIBLE);
760 schedule_timeout(HZ / 10);
761 }
762
763 if (s) {
764 if (!sock) {
765 drbd_send_fp(mdev, s, P_HAND_SHAKE_S);
766 sock = s;
767 s = NULL;
768 } else if (!msock) {
769 drbd_send_fp(mdev, s, P_HAND_SHAKE_M);
770 msock = s;
771 s = NULL;
772 } else {
773 dev_err(DEV, "Logic error in drbd_connect()\n");
774 goto out_release_sockets;
775 }
776 }
777
778 if (sock && msock) {
779 __set_current_state(TASK_INTERRUPTIBLE);
780 schedule_timeout(HZ / 10);
781 ok = drbd_socket_okay(mdev, &sock);
782 ok = drbd_socket_okay(mdev, &msock) && ok;
783 if (ok)
784 break;
785 }
786
787retry:
788 s = drbd_wait_for_connect(mdev);
789 if (s) {
790 try = drbd_recv_fp(mdev, s);
791 drbd_socket_okay(mdev, &sock);
792 drbd_socket_okay(mdev, &msock);
793 switch (try) {
794 case P_HAND_SHAKE_S:
795 if (sock) {
796 dev_warn(DEV, "initial packet S crossed\n");
797 sock_release(sock);
798 }
799 sock = s;
800 break;
801 case P_HAND_SHAKE_M:
802 if (msock) {
803 dev_warn(DEV, "initial packet M crossed\n");
804 sock_release(msock);
805 }
806 msock = s;
807 set_bit(DISCARD_CONCURRENT, &mdev->flags);
808 break;
809 default:
810 dev_warn(DEV, "Error receiving initial packet\n");
811 sock_release(s);
812 if (random32() & 1)
813 goto retry;
814 }
815 }
816
817 if (mdev->state.conn <= C_DISCONNECTING)
818 goto out_release_sockets;
819 if (signal_pending(current)) {
820 flush_signals(current);
821 smp_rmb();
822 if (get_t_state(&mdev->receiver) == Exiting)
823 goto out_release_sockets;
824 }
825
826 if (sock && msock) {
827 ok = drbd_socket_okay(mdev, &sock);
828 ok = drbd_socket_okay(mdev, &msock) && ok;
829 if (ok)
830 break;
831 }
832 } while (1);
833
834 msock->sk->sk_reuse = 1; /* SO_REUSEADDR */
835 sock->sk->sk_reuse = 1; /* SO_REUSEADDR */
836
837 sock->sk->sk_allocation = GFP_NOIO;
838 msock->sk->sk_allocation = GFP_NOIO;
839
840 sock->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK;
841 msock->sk->sk_priority = TC_PRIO_INTERACTIVE;
842
843 if (mdev->net_conf->sndbuf_size) {
844 sock->sk->sk_sndbuf = mdev->net_conf->sndbuf_size;
845 sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
846 }
847
848 if (mdev->net_conf->rcvbuf_size) {
849 sock->sk->sk_rcvbuf = mdev->net_conf->rcvbuf_size;
850 sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
851 }
852
853 /* NOT YET ...
854 * sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10;
855 * sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
856 * first set it to the P_HAND_SHAKE timeout,
857 * which we set to 4x the configured ping_timeout. */
858 sock->sk->sk_sndtimeo =
859 sock->sk->sk_rcvtimeo = mdev->net_conf->ping_timeo*4*HZ/10;
860
861 msock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10;
862 msock->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ;
863
864 /* we don't want delays.
865 * we use TCP_CORK where apropriate, though */
866 drbd_tcp_nodelay(sock);
867 drbd_tcp_nodelay(msock);
868
869 mdev->data.socket = sock;
870 mdev->meta.socket = msock;
871 mdev->last_received = jiffies;
872
873 D_ASSERT(mdev->asender.task == NULL);
874
875 h = drbd_do_handshake(mdev);
876 if (h <= 0)
877 return h;
878
879 if (mdev->cram_hmac_tfm) {
880 /* drbd_request_state(mdev, NS(conn, WFAuth)); */
b10d96cb
JT		 881 switch (drbd_do_auth(mdev)) {
882 case -1:
b411b363
PR		 883 dev_err(DEV, "Authentication of peer failed\n");
884 return -1;
b10d96cb
JT		 885 case 0:
886 dev_err(DEV, "Authentication of peer failed, trying again.\n");
887 return 0;
b411b363
PR		 888 }
889 }
890
891 if (drbd_request_state(mdev, NS(conn, C_WF_REPORT_PARAMS)) < SS_SUCCESS)
892 return 0;
893
894 sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10;
895 sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
896
897 atomic_set(&mdev->packet_seq, 0);
898 mdev->peer_seq = 0;
899
900 drbd_thread_start(&mdev->asender);
901
902 drbd_send_protocol(mdev);
903 drbd_send_sync_param(mdev, &mdev->sync_conf);
904 drbd_send_sizes(mdev, 0);
905 drbd_send_uuids(mdev);
906 drbd_send_state(mdev);
907 clear_bit(USE_DEGR_WFC_T, &mdev->flags);
908 clear_bit(RESIZE_PENDING, &mdev->flags);
909
910 return 1;
911
912out_release_sockets:
913 if (sock)
914 sock_release(sock);
915 if (msock)
916 sock_release(msock);
917 return -1;
918}
919
920static int drbd_recv_header(struct drbd_conf *mdev, struct p_header *h)
921{
922 int r;
923
924 r = drbd_recv(mdev, h, sizeof(*h));
925
926 if (unlikely(r != sizeof(*h))) {
927 dev_err(DEV, "short read expecting header on sock: r=%d\n", r);
928 return FALSE;
929 };
930 h->command = be16_to_cpu(h->command);
931 h->length = be16_to_cpu(h->length);
932 if (unlikely(h->magic != BE_DRBD_MAGIC)) {
933 dev_err(DEV, "magic?? on data m: 0x%lx c: %d l: %d\n",
934 (long)be32_to_cpu(h->magic),
935 h->command, h->length);
936 return FALSE;
937 }
938 mdev->last_received = jiffies;
939
940 return TRUE;
941}
942
943static enum finish_epoch drbd_flush_after_epoch(struct drbd_conf *mdev, struct drbd_epoch *epoch)
944{
945 int rv;
946
947 if (mdev->write_ordering >= WO_bdev_flush && get_ldev(mdev)) {
948 rv = blkdev_issue_flush(mdev->ldev->backing_bdev, NULL);
949 if (rv) {
950 dev_err(DEV, "local disk flush failed with status %d\n", rv);
951 /* would rather check on EOPNOTSUPP, but that is not reliable.
952 * don't try again for ANY return value != 0
953 * if (rv == -EOPNOTSUPP) */
954 drbd_bump_write_ordering(mdev, WO_drain_io);
955 }
956 put_ldev(mdev);
957 }
958
959 return drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE);
960}
961
962static int w_flush(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
963{
964 struct flush_work *fw = (struct flush_work *)w;
965 struct drbd_epoch *epoch = fw->epoch;
966
967 kfree(w);
968
969 if (!test_and_set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags))
970 drbd_flush_after_epoch(mdev, epoch);
971
972 drbd_may_finish_epoch(mdev, epoch, EV_PUT |
973 (mdev->state.conn < C_CONNECTED ? EV_CLEANUP : 0));
974
975 return 1;
976}
977
978/**
979 * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it.
980 * @mdev: DRBD device.
981 * @epoch: Epoch object.
982 * @ev: Epoch event.
983 */
984static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev,
985 struct drbd_epoch *epoch,
986 enum epoch_event ev)
987{
988 int finish, epoch_size;
989 struct drbd_epoch *next_epoch;
990 int schedule_flush = 0;
991 enum finish_epoch rv = FE_STILL_LIVE;
992
993 spin_lock(&mdev->epoch_lock);
994 do {
995 next_epoch = NULL;
996 finish = 0;
997
998 epoch_size = atomic_read(&epoch->epoch_size);
999
1000 switch (ev & ~EV_CLEANUP) {
1001 case EV_PUT:
1002 atomic_dec(&epoch->active);
1003 break;
1004 case EV_GOT_BARRIER_NR:
1005 set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags);
1006
1007 /* Special case: If we just switched from WO_bio_barrier to
1008 WO_bdev_flush we should not finish the current epoch */
1009 if (test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags) && epoch_size == 1 &&
1010 mdev->write_ordering != WO_bio_barrier &&
1011 epoch == mdev->current_epoch)
1012 clear_bit(DE_CONTAINS_A_BARRIER, &epoch->flags);
1013 break;
1014 case EV_BARRIER_DONE:
1015 set_bit(DE_BARRIER_IN_NEXT_EPOCH_DONE, &epoch->flags);
1016 break;
1017 case EV_BECAME_LAST:
1018 /* nothing to do*/
1019 break;
1020 }
1021
b411b363
PR		 1022 if (epoch_size != 0 &&
1023 atomic_read(&epoch->active) == 0 &&
1024 test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags) &&
1025 epoch->list.prev == &mdev->current_epoch->list &&
1026 !test_bit(DE_IS_FINISHING, &epoch->flags)) {
1027 /* Nearly all conditions are met to finish that epoch... */
1028 if (test_bit(DE_BARRIER_IN_NEXT_EPOCH_DONE, &epoch->flags) ||
1029 mdev->write_ordering == WO_none ||
1030 (epoch_size == 1 && test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags)) ||
1031 ev & EV_CLEANUP) {
1032 finish = 1;
1033 set_bit(DE_IS_FINISHING, &epoch->flags);
1034 } else if (!test_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags) &&
1035 mdev->write_ordering == WO_bio_barrier) {
1036 atomic_inc(&epoch->active);
1037 schedule_flush = 1;
1038 }
1039 }
1040 if (finish) {
1041 if (!(ev & EV_CLEANUP)) {
1042 spin_unlock(&mdev->epoch_lock);
1043 drbd_send_b_ack(mdev, epoch->barrier_nr, epoch_size);
1044 spin_lock(&mdev->epoch_lock);
1045 }
1046 dec_unacked(mdev);
1047
1048 if (mdev->current_epoch != epoch) {
1049 next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list);
1050 list_del(&epoch->list);
1051 ev = EV_BECAME_LAST | (ev & EV_CLEANUP);
1052 mdev->epochs--;
b411b363
PR		 1053 kfree(epoch);
1054
1055 if (rv == FE_STILL_LIVE)
1056 rv = FE_DESTROYED;
1057 } else {
1058 epoch->flags = 0;
1059 atomic_set(&epoch->epoch_size, 0);
1060 /* atomic_set(&epoch->active, 0); is alrady zero */
1061 if (rv == FE_STILL_LIVE)
1062 rv = FE_RECYCLED;
1063 }
1064 }
1065
1066 if (!next_epoch)
1067 break;
1068
1069 epoch = next_epoch;
1070 } while (1);
1071
1072 spin_unlock(&mdev->epoch_lock);
1073
1074 if (schedule_flush) {
1075 struct flush_work *fw;
1076 fw = kmalloc(sizeof(*fw), GFP_ATOMIC);
1077 if (fw) {
b411b363
PR		 1078 fw->w.cb = w_flush;
1079 fw->epoch = epoch;
1080 drbd_queue_work(&mdev->data.work, &fw->w);
1081 } else {
1082 dev_warn(DEV, "Could not kmalloc a flush_work obj\n");
1083 set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags);
1084 /* That is not a recursion, only one level */
1085 drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE);
1086 drbd_may_finish_epoch(mdev, epoch, EV_PUT);
1087 }
1088 }
1089
1090 return rv;
1091}
1092
1093/**
1094 * drbd_bump_write_ordering() - Fall back to an other write ordering method
1095 * @mdev: DRBD device.
1096 * @wo: Write ordering method to try.
1097 */
1098void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo) __must_hold(local)
1099{
1100 enum write_ordering_e pwo;
1101 static char *write_ordering_str[] = {
1102 [WO_none] = "none",
1103 [WO_drain_io] = "drain",
1104 [WO_bdev_flush] = "flush",
1105 [WO_bio_barrier] = "barrier",
1106 };
1107
1108 pwo = mdev->write_ordering;
1109 wo = min(pwo, wo);
1110 if (wo == WO_bio_barrier && mdev->ldev->dc.no_disk_barrier)
1111 wo = WO_bdev_flush;
1112 if (wo == WO_bdev_flush && mdev->ldev->dc.no_disk_flush)
1113 wo = WO_drain_io;
1114 if (wo == WO_drain_io && mdev->ldev->dc.no_disk_drain)
1115 wo = WO_none;
1116 mdev->write_ordering = wo;
1117 if (pwo != mdev->write_ordering || wo == WO_bio_barrier)
1118 dev_info(DEV, "Method to ensure write ordering: %s\n", write_ordering_str[mdev->write_ordering]);
1119}
1120
1121/**
1122 * w_e_reissue() - Worker callback; Resubmit a bio, without BIO_RW_BARRIER set
1123 * @mdev: DRBD device.
1124 * @w: work object.
1125 * @cancel: The connection will be closed anyways (unused in this callback)
1126 */
1127int w_e_reissue(struct drbd_conf *mdev, struct drbd_work *w, int cancel) __releases(local)
1128{
1129 struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w;
1130 struct bio *bio = e->private_bio;
1131
1132 /* We leave DE_CONTAINS_A_BARRIER and EE_IS_BARRIER in place,
1133 (and DE_BARRIER_IN_NEXT_EPOCH_ISSUED in the previous Epoch)
1134 so that we can finish that epoch in drbd_may_finish_epoch().
1135 That is necessary if we already have a long chain of Epochs, before
1136 we realize that BIO_RW_BARRIER is actually not supported */
1137
1138 /* As long as the -ENOTSUPP on the barrier is reported immediately
1139 that will never trigger. If it is reported late, we will just
1140 print that warning and continue correctly for all future requests
1141 with WO_bdev_flush */
1142 if (previous_epoch(mdev, e->epoch))
1143 dev_warn(DEV, "Write ordering was not enforced (one time event)\n");
1144
1145 /* prepare bio for re-submit,
1146 * re-init volatile members */
1147 /* we still have a local reference,
1148 * get_ldev was done in receive_Data. */
1149 bio->bi_bdev = mdev->ldev->backing_bdev;
1150 bio->bi_sector = e->sector;
1151 bio->bi_size = e->size;
1152 bio->bi_idx = 0;
1153
1154 bio->bi_flags &= ~(BIO_POOL_MASK - 1);
1155 bio->bi_flags |= 1 << BIO_UPTODATE;
1156
1157 /* don't know whether this is necessary: */
1158 bio->bi_phys_segments = 0;
1159 bio->bi_next = NULL;
1160
1161 /* these should be unchanged: */
1162 /* bio->bi_end_io = drbd_endio_write_sec; */
1163 /* bio->bi_vcnt = whatever; */
1164
1165 e->w.cb = e_end_block;
1166
1167 /* This is no longer a barrier request. */
1168 bio->bi_rw &= ~(1UL << BIO_RW_BARRIER);
1169
1170 drbd_generic_make_request(mdev, DRBD_FAULT_DT_WR, bio);
1171
1172 return 1;
1173}
1174
1175static int receive_Barrier(struct drbd_conf *mdev, struct p_header *h)
1176{
1177 int rv, issue_flush;
1178 struct p_barrier *p = (struct p_barrier *)h;
1179 struct drbd_epoch *epoch;
1180
1181 ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE;
1182
1183 rv = drbd_recv(mdev, h->payload, h->length);
1184 ERR_IF(rv != h->length) return FALSE;
1185
1186 inc_unacked(mdev);
1187
1188 if (mdev->net_conf->wire_protocol != DRBD_PROT_C)
1189 drbd_kick_lo(mdev);
1190
1191 mdev->current_epoch->barrier_nr = p->barrier;
1192 rv = drbd_may_finish_epoch(mdev, mdev->current_epoch, EV_GOT_BARRIER_NR);
1193
1194 /* P_BARRIER_ACK may imply that the corresponding extent is dropped from
1195 * the activity log, which means it would not be resynced in case the
1196 * R_PRIMARY crashes now.
1197 * Therefore we must send the barrier_ack after the barrier request was
1198 * completed. */
1199 switch (mdev->write_ordering) {
1200 case WO_bio_barrier:
1201 case WO_none:
1202 if (rv == FE_RECYCLED)
1203 return TRUE;
1204 break;
1205
1206 case WO_bdev_flush:
1207 case WO_drain_io:
367a8d73
PR		 1208 if (rv == FE_STILL_LIVE) {
1209 set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &mdev->current_epoch->flags);
1210 drbd_wait_ee_list_empty(mdev, &mdev->active_ee);
1211 rv = drbd_flush_after_epoch(mdev, mdev->current_epoch);
1212 }
b411b363
PR		 1213 if (rv == FE_RECYCLED)
1214 return TRUE;
1215
1216 /* The asender will send all the ACKs and barrier ACKs out, since
1217 all EEs moved from the active_ee to the done_ee. We need to
1218 provide a new epoch object for the EEs that come in soon */
1219 break;
1220 }
1221
1222 /* receiver context, in the writeout path of the other node.
1223 * avoid potential distributed deadlock */
1224 epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO);
1225 if (!epoch) {
1226 dev_warn(DEV, "Allocation of an epoch failed, slowing down\n");
d3db7b48 1227 issue_flush = !test_and_set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &mdev->current_epoch->flags);
b411b363
PR		 1228 drbd_wait_ee_list_empty(mdev, &mdev->active_ee);
1229 if (issue_flush) {
1230 rv = drbd_flush_after_epoch(mdev, mdev->current_epoch);
1231 if (rv == FE_RECYCLED)
1232 return TRUE;
1233 }
1234
1235 drbd_wait_ee_list_empty(mdev, &mdev->done_ee);
1236
1237 return TRUE;
1238 }
1239
1240 epoch->flags = 0;
1241 atomic_set(&epoch->epoch_size, 0);
1242 atomic_set(&epoch->active, 0);
1243
1244 spin_lock(&mdev->epoch_lock);
1245 if (atomic_read(&mdev->current_epoch->epoch_size)) {
1246 list_add(&epoch->list, &mdev->current_epoch->list);
1247 mdev->current_epoch = epoch;
1248 mdev->epochs++;
b411b363
PR		 1249 } else {
1250 /* The current_epoch got recycled while we allocated this one... */
1251 kfree(epoch);
1252 }
1253 spin_unlock(&mdev->epoch_lock);
1254
1255 return TRUE;
1256}
1257
1258/* used from receive_RSDataReply (recv_resync_read)
1259 * and from receive_Data */
1260static struct drbd_epoch_entry *
1261read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, int data_size) __must_hold(local)
1262{
1263 struct drbd_epoch_entry *e;
1264 struct bio_vec *bvec;
1265 struct page *page;
1266 struct bio *bio;
1267 int dgs, ds, i, rr;
1268 void *dig_in = mdev->int_dig_in;
1269 void *dig_vv = mdev->int_dig_vv;
1270
1271 dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ?
1272 crypto_hash_digestsize(mdev->integrity_r_tfm) : 0;
1273
1274 if (dgs) {
1275 rr = drbd_recv(mdev, dig_in, dgs);
1276 if (rr != dgs) {
1277 dev_warn(DEV, "short read receiving data digest: read %d expected %d\n",
1278 rr, dgs);
1279 return NULL;
1280 }
1281 }
1282
1283 data_size -= dgs;
1284
1285 ERR_IF(data_size & 0x1ff) return NULL;
1286 ERR_IF(data_size > DRBD_MAX_SEGMENT_SIZE) return NULL;
1287
1288 /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD
1289 * "criss-cross" setup, that might cause write-out on some other DRBD,
1290 * which in turn might block on the other node at this very place. */
1291 e = drbd_alloc_ee(mdev, id, sector, data_size, GFP_NOIO);
1292 if (!e)
1293 return NULL;
1294 bio = e->private_bio;
1295 ds = data_size;
1296 bio_for_each_segment(bvec, bio, i) {
1297 page = bvec->bv_page;
1298 rr = drbd_recv(mdev, kmap(page), min_t(int, ds, PAGE_SIZE));
1299 kunmap(page);
1300 if (rr != min_t(int, ds, PAGE_SIZE)) {
1301 drbd_free_ee(mdev, e);
1302 dev_warn(DEV, "short read receiving data: read %d expected %d\n",
1303 rr, min_t(int, ds, PAGE_SIZE));
1304 return NULL;
1305 }
1306 ds -= rr;
1307 }
1308
1309 if (dgs) {
1310 drbd_csum(mdev, mdev->integrity_r_tfm, bio, dig_vv);
1311 if (memcmp(dig_in, dig_vv, dgs)) {
1312 dev_err(DEV, "Digest integrity check FAILED.\n");
1313 drbd_bcast_ee(mdev, "digest failed",
1314 dgs, dig_in, dig_vv, e);
1315 drbd_free_ee(mdev, e);
1316 return NULL;
1317 }
1318 }
1319 mdev->recv_cnt += data_size>>9;
1320 return e;
1321}
1322
1323/* drbd_drain_block() just takes a data block
1324 * out of the socket input buffer, and discards it.
1325 */
1326static int drbd_drain_block(struct drbd_conf *mdev, int data_size)
1327{
1328 struct page *page;
1329 int rr, rv = 1;
1330 void *data;
1331
1332 page = drbd_pp_alloc(mdev, 1);
1333
1334 data = kmap(page);
1335 while (data_size) {
1336 rr = drbd_recv(mdev, data, min_t(int, data_size, PAGE_SIZE));
1337 if (rr != min_t(int, data_size, PAGE_SIZE)) {
1338 rv = 0;
1339 dev_warn(DEV, "short read receiving data: read %d expected %d\n",
1340 rr, min_t(int, data_size, PAGE_SIZE));
1341 break;
1342 }
1343 data_size -= rr;
1344 }
1345 kunmap(page);
1346 drbd_pp_free(mdev, page);
1347 return rv;
1348}
1349
1350static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req,
1351 sector_t sector, int data_size)
1352{
1353 struct bio_vec *bvec;
1354 struct bio *bio;
1355 int dgs, rr, i, expect;
1356 void *dig_in = mdev->int_dig_in;
1357 void *dig_vv = mdev->int_dig_vv;
1358
1359 dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ?
1360 crypto_hash_digestsize(mdev->integrity_r_tfm) : 0;
1361
1362 if (dgs) {
1363 rr = drbd_recv(mdev, dig_in, dgs);
1364 if (rr != dgs) {
1365 dev_warn(DEV, "short read receiving data reply digest: read %d expected %d\n",
1366 rr, dgs);
1367 return 0;
1368 }
1369 }
1370
1371 data_size -= dgs;
1372
1373 /* optimistically update recv_cnt. if receiving fails below,
1374 * we disconnect anyways, and counters will be reset. */
1375 mdev->recv_cnt += data_size>>9;
1376
1377 bio = req->master_bio;
1378 D_ASSERT(sector == bio->bi_sector);
1379
1380 bio_for_each_segment(bvec, bio, i) {
1381 expect = min_t(int, data_size, bvec->bv_len);
1382 rr = drbd_recv(mdev,
1383 kmap(bvec->bv_page)+bvec->bv_offset,
1384 expect);
1385 kunmap(bvec->bv_page);
1386 if (rr != expect) {
1387 dev_warn(DEV, "short read receiving data reply: "
1388 "read %d expected %d\n",
1389 rr, expect);
1390 return 0;
1391 }
1392 data_size -= rr;
1393 }
1394
1395 if (dgs) {
1396 drbd_csum(mdev, mdev->integrity_r_tfm, bio, dig_vv);
1397 if (memcmp(dig_in, dig_vv, dgs)) {
1398 dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n");
1399 return 0;
1400 }
1401 }
1402
1403 D_ASSERT(data_size == 0);
1404 return 1;
1405}
1406
1407/* e_end_resync_block() is called via
1408 * drbd_process_done_ee() by asender only */
1409static int e_end_resync_block(struct drbd_conf *mdev, struct drbd_work *w, int unused)
1410{
1411 struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w;
1412 sector_t sector = e->sector;
1413 int ok;
1414
1415 D_ASSERT(hlist_unhashed(&e->colision));
1416
1417 if (likely(drbd_bio_uptodate(e->private_bio))) {
1418 drbd_set_in_sync(mdev, sector, e->size);
1419 ok = drbd_send_ack(mdev, P_RS_WRITE_ACK, e);
1420 } else {
1421 /* Record failure to sync */
1422 drbd_rs_failed_io(mdev, sector, e->size);
1423
1424 ok = drbd_send_ack(mdev, P_NEG_ACK, e);
1425 }
1426 dec_unacked(mdev);
1427
1428 return ok;
1429}
1430
1431static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local)
1432{
1433 struct drbd_epoch_entry *e;
1434
1435 e = read_in_block(mdev, ID_SYNCER, sector, data_size);
1436 if (!e) {
1437 put_ldev(mdev);
1438 return FALSE;
1439 }
1440
1441 dec_rs_pending(mdev);
1442
1443 e->private_bio->bi_end_io = drbd_endio_write_sec;
1444 e->private_bio->bi_rw = WRITE;
1445 e->w.cb = e_end_resync_block;
1446
1447 inc_unacked(mdev);
1448 /* corresponding dec_unacked() in e_end_resync_block()
1449 * respective _drbd_clear_done_ee */
1450
1451 spin_lock_irq(&mdev->req_lock);
1452 list_add(&e->w.list, &mdev->sync_ee);
1453 spin_unlock_irq(&mdev->req_lock);
1454
b411b363
PR		 1455 drbd_generic_make_request(mdev, DRBD_FAULT_RS_WR, e->private_bio);
1456 /* accounting done in endio */
1457
1458 maybe_kick_lo(mdev);
1459 return TRUE;
1460}
1461
1462static int receive_DataReply(struct drbd_conf *mdev, struct p_header *h)
1463{
1464 struct drbd_request *req;
1465 sector_t sector;
1466 unsigned int header_size, data_size;
1467 int ok;
1468 struct p_data *p = (struct p_data *)h;
1469
1470 header_size = sizeof(*p) - sizeof(*h);
1471 data_size = h->length - header_size;
1472
1473 ERR_IF(data_size == 0) return FALSE;
1474
1475 if (drbd_recv(mdev, h->payload, header_size) != header_size)
1476 return FALSE;
1477
1478 sector = be64_to_cpu(p->sector);
1479
1480 spin_lock_irq(&mdev->req_lock);
1481 req = _ar_id_to_req(mdev, p->block_id, sector);
1482 spin_unlock_irq(&mdev->req_lock);
1483 if (unlikely(!req)) {
1484 dev_err(DEV, "Got a corrupt block_id/sector pair(1).\n");
1485 return FALSE;
1486 }
1487
1488 /* hlist_del(&req->colision) is done in _req_may_be_done, to avoid
1489 * special casing it there for the various failure cases.
1490 * still no race with drbd_fail_pending_reads */
1491 ok = recv_dless_read(mdev, req, sector, data_size);
1492
1493 if (ok)
1494 req_mod(req, data_received);
1495 /* else: nothing. handled from drbd_disconnect...
1496 * I don't think we may complete this just yet
1497 * in case we are "on-disconnect: freeze" */
1498
1499 return ok;
1500}
1501
1502static int receive_RSDataReply(struct drbd_conf *mdev, struct p_header *h)
1503{
1504 sector_t sector;
1505 unsigned int header_size, data_size;
1506 int ok;
1507 struct p_data *p = (struct p_data *)h;
1508
1509 header_size = sizeof(*p) - sizeof(*h);
1510 data_size = h->length - header_size;
1511
1512 ERR_IF(data_size == 0) return FALSE;
1513
1514 if (drbd_recv(mdev, h->payload, header_size) != header_size)
1515 return FALSE;
1516
1517 sector = be64_to_cpu(p->sector);
1518 D_ASSERT(p->block_id == ID_SYNCER);
1519
1520 if (get_ldev(mdev)) {
1521 /* data is submitted to disk within recv_resync_read.
1522 * corresponding put_ldev done below on error,
1523 * or in drbd_endio_write_sec. */
1524 ok = recv_resync_read(mdev, sector, data_size);
1525 } else {
1526 if (__ratelimit(&drbd_ratelimit_state))
1527 dev_err(DEV, "Can not write resync data to local disk.\n");
1528
1529 ok = drbd_drain_block(mdev, data_size);
1530
1531 drbd_send_ack_dp(mdev, P_NEG_ACK, p);
1532 }
1533
1534 return ok;
1535}
1536
1537/* e_end_block() is called via drbd_process_done_ee().
1538 * this means this function only runs in the asender thread
1539 */
1540static int e_end_block(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
1541{
1542 struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w;
1543 sector_t sector = e->sector;
1544 struct drbd_epoch *epoch;
1545 int ok = 1, pcmd;
1546
1547 if (e->flags & EE_IS_BARRIER) {
1548 epoch = previous_epoch(mdev, e->epoch);
1549 if (epoch)
1550 drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE + (cancel ? EV_CLEANUP : 0));
1551 }
1552
1553 if (mdev->net_conf->wire_protocol == DRBD_PROT_C) {
1554 if (likely(drbd_bio_uptodate(e->private_bio))) {
1555 pcmd = (mdev->state.conn >= C_SYNC_SOURCE &&
1556 mdev->state.conn <= C_PAUSED_SYNC_T &&
1557 e->flags & EE_MAY_SET_IN_SYNC) ?
1558 P_RS_WRITE_ACK : P_WRITE_ACK;
1559 ok &= drbd_send_ack(mdev, pcmd, e);
1560 if (pcmd == P_RS_WRITE_ACK)
1561 drbd_set_in_sync(mdev, sector, e->size);
1562 } else {
1563 ok = drbd_send_ack(mdev, P_NEG_ACK, e);
1564 /* we expect it to be marked out of sync anyways...
1565 * maybe assert this? */
1566 }
1567 dec_unacked(mdev);
1568 }
1569 /* we delete from the conflict detection hash _after_ we sent out the
1570 * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */
1571 if (mdev->net_conf->two_primaries) {
1572 spin_lock_irq(&mdev->req_lock);
1573 D_ASSERT(!hlist_unhashed(&e->colision));
1574 hlist_del_init(&e->colision);
1575 spin_unlock_irq(&mdev->req_lock);
1576 } else {
1577 D_ASSERT(hlist_unhashed(&e->colision));
1578 }
1579
1580 drbd_may_finish_epoch(mdev, e->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0));
1581
1582 return ok;
1583}
1584
1585static int e_send_discard_ack(struct drbd_conf *mdev, struct drbd_work *w, int unused)
1586{
1587 struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w;
1588 int ok = 1;
1589
1590 D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C);
1591 ok = drbd_send_ack(mdev, P_DISCARD_ACK, e);
1592
1593 spin_lock_irq(&mdev->req_lock);
1594 D_ASSERT(!hlist_unhashed(&e->colision));
1595 hlist_del_init(&e->colision);
1596 spin_unlock_irq(&mdev->req_lock);
1597
1598 dec_unacked(mdev);
1599
1600 return ok;
1601}
1602
1603/* Called from receive_Data.
1604 * Synchronize packets on sock with packets on msock.
1605 *
1606 * This is here so even when a P_DATA packet traveling via sock overtook an Ack
1607 * packet traveling on msock, they are still processed in the order they have
1608 * been sent.
1609 *
1610 * Note: we don't care for Ack packets overtaking P_DATA packets.
1611 *
1612 * In case packet_seq is larger than mdev->peer_seq number, there are
1613 * outstanding packets on the msock. We wait for them to arrive.
1614 * In case we are the logically next packet, we update mdev->peer_seq
1615 * ourselves. Correctly handles 32bit wrap around.
1616 *
1617 * Assume we have a 10 GBit connection, that is about 1<<30 byte per second,
1618 * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds
1619 * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have
1620 * 1<<9 == 512 seconds aka ages for the 32bit wrap around...
1621 *
1622 * returns 0 if we may process the packet,
1623 * -ERESTARTSYS if we were interrupted (by disconnect signal). */
1624static int drbd_wait_peer_seq(struct drbd_conf *mdev, const u32 packet_seq)
1625{
1626 DEFINE_WAIT(wait);
1627 unsigned int p_seq;
1628 long timeout;
1629 int ret = 0;
1630 spin_lock(&mdev->peer_seq_lock);
1631 for (;;) {
1632 prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE);
1633 if (seq_le(packet_seq, mdev->peer_seq+1))
1634 break;
1635 if (signal_pending(current)) {
1636 ret = -ERESTARTSYS;
1637 break;
1638 }
1639 p_seq = mdev->peer_seq;
1640 spin_unlock(&mdev->peer_seq_lock);
1641 timeout = schedule_timeout(30*HZ);
1642 spin_lock(&mdev->peer_seq_lock);
1643 if (timeout == 0 && p_seq == mdev->peer_seq) {
1644 ret = -ETIMEDOUT;
1645 dev_err(DEV, "ASSERT FAILED waited 30 seconds for sequence update, forcing reconnect\n");
1646 break;
1647 }
1648 }
1649 finish_wait(&mdev->seq_wait, &wait);
1650 if (mdev->peer_seq+1 == packet_seq)
1651 mdev->peer_seq++;
1652 spin_unlock(&mdev->peer_seq_lock);
1653 return ret;
1654}
1655
1656/* mirrored write */
1657static int receive_Data(struct drbd_conf *mdev, struct p_header *h)
1658{
1659 sector_t sector;
1660 struct drbd_epoch_entry *e;
1661 struct p_data *p = (struct p_data *)h;
1662 int header_size, data_size;
1663 int rw = WRITE;
1664 u32 dp_flags;
1665
1666 header_size = sizeof(*p) - sizeof(*h);
1667 data_size = h->length - header_size;
1668
1669 ERR_IF(data_size == 0) return FALSE;
1670
1671 if (drbd_recv(mdev, h->payload, header_size) != header_size)
1672 return FALSE;
1673
1674 if (!get_ldev(mdev)) {
1675 if (__ratelimit(&drbd_ratelimit_state))
1676 dev_err(DEV, "Can not write mirrored data block "
1677 "to local disk.\n");
1678 spin_lock(&mdev->peer_seq_lock);
1679 if (mdev->peer_seq+1 == be32_to_cpu(p->seq_num))
1680 mdev->peer_seq++;
1681 spin_unlock(&mdev->peer_seq_lock);
1682
1683 drbd_send_ack_dp(mdev, P_NEG_ACK, p);
1684 atomic_inc(&mdev->current_epoch->epoch_size);
1685 return drbd_drain_block(mdev, data_size);
1686 }
1687
1688 /* get_ldev(mdev) successful.
1689 * Corresponding put_ldev done either below (on various errors),
1690 * or in drbd_endio_write_sec, if we successfully submit the data at
1691 * the end of this function. */
1692
1693 sector = be64_to_cpu(p->sector);
1694 e = read_in_block(mdev, p->block_id, sector, data_size);
1695 if (!e) {
1696 put_ldev(mdev);
1697 return FALSE;
1698 }
1699
1700 e->private_bio->bi_end_io = drbd_endio_write_sec;
1701 e->w.cb = e_end_block;
1702
1703 spin_lock(&mdev->epoch_lock);
1704 e->epoch = mdev->current_epoch;
1705 atomic_inc(&e->epoch->epoch_size);
1706 atomic_inc(&e->epoch->active);
1707
1708 if (mdev->write_ordering == WO_bio_barrier && atomic_read(&e->epoch->epoch_size) == 1) {
1709 struct drbd_epoch *epoch;
1710 /* Issue a barrier if we start a new epoch, and the previous epoch
1711 was not a epoch containing a single request which already was
1712 a Barrier. */
1713 epoch = list_entry(e->epoch->list.prev, struct drbd_epoch, list);
1714 if (epoch == e->epoch) {
1715 set_bit(DE_CONTAINS_A_BARRIER, &e->epoch->flags);
b411b363
PR		 1716 rw |= (1<<BIO_RW_BARRIER);
1717 e->flags |= EE_IS_BARRIER;
1718 } else {
1719 if (atomic_read(&epoch->epoch_size) > 1 ||
1720 !test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags)) {
1721 set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags);
b411b363 1722 set_bit(DE_CONTAINS_A_BARRIER, &e->epoch->flags);
b411b363
PR		 1723 rw |= (1<<BIO_RW_BARRIER);
1724 e->flags |= EE_IS_BARRIER;
1725 }
1726 }
1727 }
1728 spin_unlock(&mdev->epoch_lock);
1729
1730 dp_flags = be32_to_cpu(p->dp_flags);
1731 if (dp_flags & DP_HARDBARRIER) {
1732 dev_err(DEV, "ASSERT FAILED would have submitted barrier request\n");
1733 /* rw |= (1<<BIO_RW_BARRIER); */
1734 }
1735 if (dp_flags & DP_RW_SYNC)
1736 rw |= (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG);
1737 if (dp_flags & DP_MAY_SET_IN_SYNC)
1738 e->flags |= EE_MAY_SET_IN_SYNC;
1739
1740 /* I'm the receiver, I do hold a net_cnt reference. */
1741 if (!mdev->net_conf->two_primaries) {
1742 spin_lock_irq(&mdev->req_lock);
1743 } else {
1744 /* don't get the req_lock yet,
1745 * we may sleep in drbd_wait_peer_seq */
1746 const int size = e->size;
1747 const int discard = test_bit(DISCARD_CONCURRENT, &mdev->flags);
1748 DEFINE_WAIT(wait);
1749 struct drbd_request *i;
1750 struct hlist_node *n;
1751 struct hlist_head *slot;
1752 int first;
1753
1754 D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C);
1755 BUG_ON(mdev->ee_hash == NULL);
1756 BUG_ON(mdev->tl_hash == NULL);
1757
1758 /* conflict detection and handling:
1759 * 1. wait on the sequence number,
1760 * in case this data packet overtook ACK packets.
1761 * 2. check our hash tables for conflicting requests.
1762 * we only need to walk the tl_hash, since an ee can not
1763 * have a conflict with an other ee: on the submitting
1764 * node, the corresponding req had already been conflicting,
1765 * and a conflicting req is never sent.
1766 *
1767 * Note: for two_primaries, we are protocol C,
1768 * so there cannot be any request that is DONE
1769 * but still on the transfer log.
1770 *
1771 * unconditionally add to the ee_hash.
1772 *
1773 * if no conflicting request is found:
1774 * submit.
1775 *
1776 * if any conflicting request is found
1777 * that has not yet been acked,
1778 * AND I have the "discard concurrent writes" flag:
1779 * queue (via done_ee) the P_DISCARD_ACK; OUT.
1780 *
1781 * if any conflicting request is found:
1782 * block the receiver, waiting on misc_wait
1783 * until no more conflicting requests are there,
1784 * or we get interrupted (disconnect).
1785 *
1786 * we do not just write after local io completion of those
1787 * requests, but only after req is done completely, i.e.
1788 * we wait for the P_DISCARD_ACK to arrive!
1789 *
1790 * then proceed normally, i.e. submit.
1791 */
1792 if (drbd_wait_peer_seq(mdev, be32_to_cpu(p->seq_num)))
1793 goto out_interrupted;
1794
1795 spin_lock_irq(&mdev->req_lock);
1796
1797 hlist_add_head(&e->colision, ee_hash_slot(mdev, sector));
1798
1799#define OVERLAPS overlaps(i->sector, i->size, sector, size)
1800 slot = tl_hash_slot(mdev, sector);
1801 first = 1;
1802 for (;;) {
1803 int have_unacked = 0;
1804 int have_conflict = 0;
1805 prepare_to_wait(&mdev->misc_wait, &wait,
1806 TASK_INTERRUPTIBLE);
1807 hlist_for_each_entry(i, n, slot, colision) {
1808 if (OVERLAPS) {
1809 /* only ALERT on first iteration,
1810 * we may be woken up early... */
1811 if (first)
1812 dev_alert(DEV, "%s[%u] Concurrent local write detected!"
1813 " new: %llus +%u; pending: %llus +%u\n",
1814 current->comm, current->pid,
1815 (unsigned long long)sector, size,
1816 (unsigned long long)i->sector, i->size);
1817 if (i->rq_state & RQ_NET_PENDING)
1818 ++have_unacked;
1819 ++have_conflict;
1820 }
1821 }
1822#undef OVERLAPS
1823 if (!have_conflict)
1824 break;
1825
1826 /* Discard Ack only for the _first_ iteration */
1827 if (first && discard && have_unacked) {
1828 dev_alert(DEV, "Concurrent write! [DISCARD BY FLAG] sec=%llus\n",
1829 (unsigned long long)sector);
1830 inc_unacked(mdev);
1831 e->w.cb = e_send_discard_ack;
1832 list_add_tail(&e->w.list, &mdev->done_ee);
1833
1834 spin_unlock_irq(&mdev->req_lock);
1835
1836 /* we could probably send that P_DISCARD_ACK ourselves,
1837 * but I don't like the receiver using the msock */
1838
1839 put_ldev(mdev);
1840 wake_asender(mdev);
1841 finish_wait(&mdev->misc_wait, &wait);
1842 return TRUE;
1843 }
1844
1845 if (signal_pending(current)) {
1846 hlist_del_init(&e->colision);
1847
1848 spin_unlock_irq(&mdev->req_lock);
1849
1850 finish_wait(&mdev->misc_wait, &wait);
1851 goto out_interrupted;
1852 }
1853
1854 spin_unlock_irq(&mdev->req_lock);
1855 if (first) {
1856 first = 0;
1857 dev_alert(DEV, "Concurrent write! [W AFTERWARDS] "
1858 "sec=%llus\n", (unsigned long long)sector);
1859 } else if (discard) {
1860 /* we had none on the first iteration.
1861 * there must be none now. */
1862 D_ASSERT(have_unacked == 0);
1863 }
1864 schedule();
1865 spin_lock_irq(&mdev->req_lock);
1866 }
1867 finish_wait(&mdev->misc_wait, &wait);
1868 }
1869
1870 list_add(&e->w.list, &mdev->active_ee);
1871 spin_unlock_irq(&mdev->req_lock);
1872
1873 switch (mdev->net_conf->wire_protocol) {
1874 case DRBD_PROT_C:
1875 inc_unacked(mdev);
1876 /* corresponding dec_unacked() in e_end_block()
1877 * respective _drbd_clear_done_ee */
1878 break;
1879 case DRBD_PROT_B:
1880 /* I really don't like it that the receiver thread
1881 * sends on the msock, but anyways */
1882 drbd_send_ack(mdev, P_RECV_ACK, e);
1883 break;
1884 case DRBD_PROT_A:
1885 /* nothing to do */
1886 break;
1887 }
1888
1889 if (mdev->state.pdsk == D_DISKLESS) {
1890 /* In case we have the only disk of the cluster, */
1891 drbd_set_out_of_sync(mdev, e->sector, e->size);
1892 e->flags |= EE_CALL_AL_COMPLETE_IO;
1893 drbd_al_begin_io(mdev, e->sector);
1894 }
1895
1896 e->private_bio->bi_rw = rw;
b411b363
PR		 1897 drbd_generic_make_request(mdev, DRBD_FAULT_DT_WR, e->private_bio);
1898 /* accounting done in endio */
1899
1900 maybe_kick_lo(mdev);
1901 return TRUE;
1902
1903out_interrupted:
1904 /* yes, the epoch_size now is imbalanced.
1905 * but we drop the connection anyways, so we don't have a chance to
1906 * receive a barrier... atomic_inc(&mdev->epoch_size); */
1907 put_ldev(mdev);
1908 drbd_free_ee(mdev, e);
1909 return FALSE;
1910}
1911
1912static int receive_DataRequest(struct drbd_conf *mdev, struct p_header *h)
1913{
1914 sector_t sector;
1915 const sector_t capacity = drbd_get_capacity(mdev->this_bdev);
1916 struct drbd_epoch_entry *e;
1917 struct digest_info *di = NULL;
1918 int size, digest_size;
1919 unsigned int fault_type;
1920 struct p_block_req *p =
1921 (struct p_block_req *)h;
1922 const int brps = sizeof(*p)-sizeof(*h);
1923
1924 if (drbd_recv(mdev, h->payload, brps) != brps)
1925 return FALSE;
1926
1927 sector = be64_to_cpu(p->sector);
1928 size = be32_to_cpu(p->blksize);
1929
1930 if (size <= 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_SEGMENT_SIZE) {
1931 dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__,
1932 (unsigned long long)sector, size);
1933 return FALSE;
1934 }
1935 if (sector + (size>>9) > capacity) {
1936 dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__,
1937 (unsigned long long)sector, size);
1938 return FALSE;
1939 }
1940
1941 if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) {
1942 if (__ratelimit(&drbd_ratelimit_state))
1943 dev_err(DEV, "Can not satisfy peer's read request, "
1944 "no local data.\n");
1945 drbd_send_ack_rp(mdev, h->command == P_DATA_REQUEST ? P_NEG_DREPLY :
1946 P_NEG_RS_DREPLY , p);
1947 return TRUE;
1948 }
1949
1950 /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD
1951 * "criss-cross" setup, that might cause write-out on some other DRBD,
1952 * which in turn might block on the other node at this very place. */
1953 e = drbd_alloc_ee(mdev, p->block_id, sector, size, GFP_NOIO);
1954 if (!e) {
1955 put_ldev(mdev);
1956 return FALSE;
1957 }
1958
1959 e->private_bio->bi_rw = READ;
1960 e->private_bio->bi_end_io = drbd_endio_read_sec;
1961
1962 switch (h->command) {
1963 case P_DATA_REQUEST:
1964 e->w.cb = w_e_end_data_req;
1965 fault_type = DRBD_FAULT_DT_RD;
1966 break;
1967 case P_RS_DATA_REQUEST:
1968 e->w.cb = w_e_end_rsdata_req;
1969 fault_type = DRBD_FAULT_RS_RD;
1970 /* Eventually this should become asynchronously. Currently it
1971 * blocks the whole receiver just to delay the reading of a
1972 * resync data block.
1973 * the drbd_work_queue mechanism is made for this...
1974 */
1975 if (!drbd_rs_begin_io(mdev, sector)) {
1976 /* we have been interrupted,
1977 * probably connection lost! */
1978 D_ASSERT(signal_pending(current));
1979 goto out_free_e;
1980 }
1981 break;
1982
1983 case P_OV_REPLY:
1984 case P_CSUM_RS_REQUEST:
1985 fault_type = DRBD_FAULT_RS_RD;
1986 digest_size = h->length - brps ;
1987 di = kmalloc(sizeof(*di) + digest_size, GFP_NOIO);
1988 if (!di)
1989 goto out_free_e;
1990
1991 di->digest_size = digest_size;
1992 di->digest = (((char *)di)+sizeof(struct digest_info));
1993
1994 if (drbd_recv(mdev, di->digest, digest_size) != digest_size)
1995 goto out_free_e;
1996
1997 e->block_id = (u64)(unsigned long)di;
1998 if (h->command == P_CSUM_RS_REQUEST) {
1999 D_ASSERT(mdev->agreed_pro_version >= 89);
2000 e->w.cb = w_e_end_csum_rs_req;
2001 } else if (h->command == P_OV_REPLY) {
2002 e->w.cb = w_e_end_ov_reply;
2003 dec_rs_pending(mdev);
2004 break;
2005 }
2006
2007 if (!drbd_rs_begin_io(mdev, sector)) {
2008 /* we have been interrupted, probably connection lost! */
2009 D_ASSERT(signal_pending(current));
2010 goto out_free_e;
2011 }
2012 break;
2013
2014 case P_OV_REQUEST:
2015 if (mdev->state.conn >= C_CONNECTED &&
2016 mdev->state.conn != C_VERIFY_T)
2017 dev_warn(DEV, "ASSERT FAILED: got P_OV_REQUEST while being %s\n",
2018 drbd_conn_str(mdev->state.conn));
2019 if (mdev->ov_start_sector == ~(sector_t)0 &&
2020 mdev->agreed_pro_version >= 90) {
2021 mdev->ov_start_sector = sector;
2022 mdev->ov_position = sector;
2023 mdev->ov_left = mdev->rs_total - BM_SECT_TO_BIT(sector);
2024 dev_info(DEV, "Online Verify start sector: %llu\n",
2025 (unsigned long long)sector);
2026 }
2027 e->w.cb = w_e_end_ov_req;
2028 fault_type = DRBD_FAULT_RS_RD;
2029 /* Eventually this should become asynchronous. Currently it
2030 * blocks the whole receiver just to delay the reading of a
2031 * resync data block.
2032 * the drbd_work_queue mechanism is made for this...
2033 */
2034 if (!drbd_rs_begin_io(mdev, sector)) {
2035 /* we have been interrupted,
2036 * probably connection lost! */
2037 D_ASSERT(signal_pending(current));
2038 goto out_free_e;
2039 }
2040 break;
2041
2042
2043 default:
2044 dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n",
2045 cmdname(h->command));
2046 fault_type = DRBD_FAULT_MAX;
2047 }
2048
2049 spin_lock_irq(&mdev->req_lock);
2050 list_add(&e->w.list, &mdev->read_ee);
2051 spin_unlock_irq(&mdev->req_lock);
2052
2053 inc_unacked(mdev);
2054
b411b363
PR		 2055 drbd_generic_make_request(mdev, fault_type, e->private_bio);
2056 maybe_kick_lo(mdev);
2057
2058 return TRUE;
2059
2060out_free_e:
2061 kfree(di);
2062 put_ldev(mdev);
2063 drbd_free_ee(mdev, e);
2064 return FALSE;
2065}
2066
2067static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local)
2068{
2069 int self, peer, rv = -100;
2070 unsigned long ch_self, ch_peer;
2071
2072 self = mdev->ldev->md.uuid[UI_BITMAP] & 1;
2073 peer = mdev->p_uuid[UI_BITMAP] & 1;
2074
2075 ch_peer = mdev->p_uuid[UI_SIZE];
2076 ch_self = mdev->comm_bm_set;
2077
2078 switch (mdev->net_conf->after_sb_0p) {
2079 case ASB_CONSENSUS:
2080 case ASB_DISCARD_SECONDARY:
2081 case ASB_CALL_HELPER:
2082 dev_err(DEV, "Configuration error.\n");
2083 break;
2084 case ASB_DISCONNECT:
2085 break;
2086 case ASB_DISCARD_YOUNGER_PRI:
2087 if (self == 0 && peer == 1) {
2088 rv = -1;
2089 break;
2090 }
2091 if (self == 1 && peer == 0) {
2092 rv = 1;
2093 break;
2094 }
2095 /* Else fall through to one of the other strategies... */
2096 case ASB_DISCARD_OLDER_PRI:
2097 if (self == 0 && peer == 1) {
2098 rv = 1;
2099 break;
2100 }
2101 if (self == 1 && peer == 0) {
2102 rv = -1;
2103 break;
2104 }
2105 /* Else fall through to one of the other strategies... */
ad19bf6e 2106 dev_warn(DEV, "Discard younger/older primary did not find a decision\n"
b411b363
PR		 2107 "Using discard-least-changes instead\n");
2108 case ASB_DISCARD_ZERO_CHG:
2109 if (ch_peer == 0 && ch_self == 0) {
2110 rv = test_bit(DISCARD_CONCURRENT, &mdev->flags)
2111 ? -1 : 1;
2112 break;
2113 } else {
2114 if (ch_peer == 0) { rv = 1; break; }
2115 if (ch_self == 0) { rv = -1; break; }
2116 }
2117 if (mdev->net_conf->after_sb_0p == ASB_DISCARD_ZERO_CHG)
2118 break;
2119 case ASB_DISCARD_LEAST_CHG:
2120 if (ch_self < ch_peer)
2121 rv = -1;
2122 else if (ch_self > ch_peer)
2123 rv = 1;
2124 else /* ( ch_self == ch_peer ) */
2125 /* Well, then use something else. */
2126 rv = test_bit(DISCARD_CONCURRENT, &mdev->flags)
2127 ? -1 : 1;
2128 break;
2129 case ASB_DISCARD_LOCAL:
2130 rv = -1;
2131 break;
2132 case ASB_DISCARD_REMOTE:
2133 rv = 1;
2134 }
2135
2136 return rv;
2137}
2138
2139static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local)
2140{
2141 int self, peer, hg, rv = -100;
2142
2143 self = mdev->ldev->md.uuid[UI_BITMAP] & 1;
2144 peer = mdev->p_uuid[UI_BITMAP] & 1;
2145
2146 switch (mdev->net_conf->after_sb_1p) {
2147 case ASB_DISCARD_YOUNGER_PRI:
2148 case ASB_DISCARD_OLDER_PRI:
2149 case ASB_DISCARD_LEAST_CHG:
2150 case ASB_DISCARD_LOCAL:
2151 case ASB_DISCARD_REMOTE:
2152 dev_err(DEV, "Configuration error.\n");
2153 break;
2154 case ASB_DISCONNECT:
2155 break;
2156 case ASB_CONSENSUS:
2157 hg = drbd_asb_recover_0p(mdev);
2158 if (hg == -1 && mdev->state.role == R_SECONDARY)
2159 rv = hg;
2160 if (hg == 1 && mdev->state.role == R_PRIMARY)
2161 rv = hg;
2162 break;
2163 case ASB_VIOLENTLY:
2164 rv = drbd_asb_recover_0p(mdev);
2165 break;
2166 case ASB_DISCARD_SECONDARY:
2167 return mdev->state.role == R_PRIMARY ? 1 : -1;
2168 case ASB_CALL_HELPER:
2169 hg = drbd_asb_recover_0p(mdev);
2170 if (hg == -1 && mdev->state.role == R_PRIMARY) {
2171 self = drbd_set_role(mdev, R_SECONDARY, 0);
2172 /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE,
2173 * we might be here in C_WF_REPORT_PARAMS which is transient.
2174 * we do not need to wait for the after state change work either. */
2175 self = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY));
2176 if (self != SS_SUCCESS) {
2177 drbd_khelper(mdev, "pri-lost-after-sb");
2178 } else {
2179 dev_warn(DEV, "Successfully gave up primary role.\n");
2180 rv = hg;
2181 }
2182 } else
2183 rv = hg;
2184 }
2185
2186 return rv;
2187}
2188
2189static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local)
2190{
2191 int self, peer, hg, rv = -100;
2192
2193 self = mdev->ldev->md.uuid[UI_BITMAP] & 1;
2194 peer = mdev->p_uuid[UI_BITMAP] & 1;
2195
2196 switch (mdev->net_conf->after_sb_2p) {
2197 case ASB_DISCARD_YOUNGER_PRI:
2198 case ASB_DISCARD_OLDER_PRI:
2199 case ASB_DISCARD_LEAST_CHG:
2200 case ASB_DISCARD_LOCAL:
2201 case ASB_DISCARD_REMOTE:
2202 case ASB_CONSENSUS:
2203 case ASB_DISCARD_SECONDARY:
2204 dev_err(DEV, "Configuration error.\n");
2205 break;
2206 case ASB_VIOLENTLY:
2207 rv = drbd_asb_recover_0p(mdev);
2208 break;
2209 case ASB_DISCONNECT:
2210 break;
2211 case ASB_CALL_HELPER:
2212 hg = drbd_asb_recover_0p(mdev);
2213 if (hg == -1) {
2214 /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE,
2215 * we might be here in C_WF_REPORT_PARAMS which is transient.
2216 * we do not need to wait for the after state change work either. */
2217 self = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY));
2218 if (self != SS_SUCCESS) {
2219 drbd_khelper(mdev, "pri-lost-after-sb");
2220 } else {
2221 dev_warn(DEV, "Successfully gave up primary role.\n");
2222 rv = hg;
2223 }
2224 } else
2225 rv = hg;
2226 }
2227
2228 return rv;
2229}
2230
2231static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid,
2232 u64 bits, u64 flags)
2233{
2234 if (!uuid) {
2235 dev_info(DEV, "%s uuid info vanished while I was looking!\n", text);
2236 return;
2237 }
2238 dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n",
2239 text,
2240 (unsigned long long)uuid[UI_CURRENT],
2241 (unsigned long long)uuid[UI_BITMAP],
2242 (unsigned long long)uuid[UI_HISTORY_START],
2243 (unsigned long long)uuid[UI_HISTORY_END],
2244 (unsigned long long)bits,
2245 (unsigned long long)flags);
2246}
2247
2248/*
2249 100 after split brain try auto recover
2250 2 C_SYNC_SOURCE set BitMap
2251 1 C_SYNC_SOURCE use BitMap
2252 0 no Sync
2253 -1 C_SYNC_TARGET use BitMap
2254 -2 C_SYNC_TARGET set BitMap
2255 -100 after split brain, disconnect
2256-1000 unrelated data
2257 */
2258static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local)
2259{
2260 u64 self, peer;
2261 int i, j;
2262
2263 self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1);
2264 peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1);
2265
2266 *rule_nr = 10;
2267 if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED)
2268 return 0;
2269
2270 *rule_nr = 20;
2271 if ((self == UUID_JUST_CREATED || self == (u64)0) &&
2272 peer != UUID_JUST_CREATED)
2273 return -2;
2274
2275 *rule_nr = 30;
2276 if (self != UUID_JUST_CREATED &&
2277 (peer == UUID_JUST_CREATED || peer == (u64)0))
2278 return 2;
2279
2280 if (self == peer) {
2281 int rct, dc; /* roles at crash time */
2282
2283 if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) {
2284
2285 if (mdev->agreed_pro_version < 91)
2286 return -1001;
2287
2288 if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) &&
2289 (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) {
2290 dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n");
2291 drbd_uuid_set_bm(mdev, 0UL);
2292
2293 drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid,
2294 mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0);
2295 *rule_nr = 34;
2296 } else {
2297 dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n");
2298 *rule_nr = 36;
2299 }
2300
2301 return 1;
2302 }
2303
2304 if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) {
2305
2306 if (mdev->agreed_pro_version < 91)
2307 return -1001;
2308
2309 if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) &&
2310 (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) {
2311 dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n");
2312
2313 mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START];
2314 mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP];
2315 mdev->p_uuid[UI_BITMAP] = 0UL;
2316
2317 drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]);
2318 *rule_nr = 35;
2319 } else {
2320 dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n");
2321 *rule_nr = 37;
2322 }
2323
2324 return -1;
2325 }
2326
2327 /* Common power [off|failure] */
2328 rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) +
2329 (mdev->p_uuid[UI_FLAGS] & 2);
2330 /* lowest bit is set when we were primary,
2331 * next bit (weight 2) is set when peer was primary */
2332 *rule_nr = 40;
2333
2334 switch (rct) {
2335 case 0: /* !self_pri && !peer_pri */ return 0;
2336 case 1: /* self_pri && !peer_pri */ return 1;
2337 case 2: /* !self_pri && peer_pri */ return -1;
2338 case 3: /* self_pri && peer_pri */
2339 dc = test_bit(DISCARD_CONCURRENT, &mdev->flags);
2340 return dc ? -1 : 1;
2341 }
2342 }
2343
2344 *rule_nr = 50;
2345 peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1);
2346 if (self == peer)
2347 return -1;
2348
2349 *rule_nr = 51;
2350 peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1);
2351 if (self == peer) {
2352 self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1);
2353 peer = mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1);
2354 if (self == peer) {
2355 /* The last P_SYNC_UUID did not get though. Undo the last start of
2356 resync as sync source modifications of the peer's UUIDs. */
2357
2358 if (mdev->agreed_pro_version < 91)
2359 return -1001;
2360
2361 mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START];
2362 mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1];
2363 return -1;
2364 }
2365 }
2366
2367 *rule_nr = 60;
2368 self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1);
2369 for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) {
2370 peer = mdev->p_uuid[i] & ~((u64)1);
2371 if (self == peer)
2372 return -2;
2373 }
2374
2375 *rule_nr = 70;
2376 self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1);
2377 peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1);
2378 if (self == peer)
2379 return 1;
2380
2381 *rule_nr = 71;
2382 self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1);
2383 if (self == peer) {
2384 self = mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1);
2385 peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1);
2386 if (self == peer) {
2387 /* The last P_SYNC_UUID did not get though. Undo the last start of
2388 resync as sync source modifications of our UUIDs. */
2389
2390 if (mdev->agreed_pro_version < 91)
2391 return -1001;
2392
2393 _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]);
2394 _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]);
2395
2396 dev_info(DEV, "Undid last start of resync:\n");
2397
2398 drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid,
2399 mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0);
2400
2401 return 1;
2402 }
2403 }
2404
2405
2406 *rule_nr = 80;
d8c2a36b 2407 peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1);
b411b363
PR		 2408 for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) {
2409 self = mdev->ldev->md.uuid[i] & ~((u64)1);
2410 if (self == peer)
2411 return 2;
2412 }
2413
2414 *rule_nr = 90;
2415 self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1);
2416 peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1);
2417 if (self == peer && self != ((u64)0))
2418 return 100;
2419
2420 *rule_nr = 100;
2421 for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) {
2422 self = mdev->ldev->md.uuid[i] & ~((u64)1);
2423 for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) {
2424 peer = mdev->p_uuid[j] & ~((u64)1);
2425 if (self == peer)
2426 return -100;
2427 }
2428 }
2429
2430 return -1000;
2431}
2432
2433/* drbd_sync_handshake() returns the new conn state on success, or
2434 CONN_MASK (-1) on failure.
2435 */
2436static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role,
2437 enum drbd_disk_state peer_disk) __must_hold(local)
2438{
2439 int hg, rule_nr;
2440 enum drbd_conns rv = C_MASK;
2441 enum drbd_disk_state mydisk;
2442
2443 mydisk = mdev->state.disk;
2444 if (mydisk == D_NEGOTIATING)
2445 mydisk = mdev->new_state_tmp.disk;
2446
2447 dev_info(DEV, "drbd_sync_handshake:\n");
2448 drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0);
2449 drbd_uuid_dump(mdev, "peer", mdev->p_uuid,
2450 mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]);
2451
2452 hg = drbd_uuid_compare(mdev, &rule_nr);
2453
2454 dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr);
2455
2456 if (hg == -1000) {
2457 dev_alert(DEV, "Unrelated data, aborting!\n");
2458 return C_MASK;
2459 }
2460 if (hg == -1001) {
2461 dev_alert(DEV, "To resolve this both sides have to support at least protocol\n");
2462 return C_MASK;
2463 }
2464
2465 if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) ||
2466 (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) {
2467 int f = (hg == -100) || abs(hg) == 2;
2468 hg = mydisk > D_INCONSISTENT ? 1 : -1;
2469 if (f)
2470 hg = hg*2;
2471 dev_info(DEV, "Becoming sync %s due to disk states.\n",
2472 hg > 0 ? "source" : "target");
2473 }
2474
2475 if (hg == 100 || (hg == -100 && mdev->net_conf->always_asbp)) {
2476 int pcount = (mdev->state.role == R_PRIMARY)
2477 + (peer_role == R_PRIMARY);
2478 int forced = (hg == -100);
2479
2480 switch (pcount) {
2481 case 0:
2482 hg = drbd_asb_recover_0p(mdev);
2483 break;
2484 case 1:
2485 hg = drbd_asb_recover_1p(mdev);
2486 break;
2487 case 2:
2488 hg = drbd_asb_recover_2p(mdev);
2489 break;
2490 }
2491 if (abs(hg) < 100) {
2492 dev_warn(DEV, "Split-Brain detected, %d primaries, "
2493 "automatically solved. Sync from %s node\n",
2494 pcount, (hg < 0) ? "peer" : "this");
2495 if (forced) {
2496 dev_warn(DEV, "Doing a full sync, since"
2497 " UUIDs where ambiguous.\n");
2498 hg = hg*2;
2499 }
2500 }
2501 }
2502
2503 if (hg == -100) {
2504 if (mdev->net_conf->want_lose && !(mdev->p_uuid[UI_FLAGS]&1))
2505 hg = -1;
2506 if (!mdev->net_conf->want_lose && (mdev->p_uuid[UI_FLAGS]&1))
2507 hg = 1;
2508
2509 if (abs(hg) < 100)
2510 dev_warn(DEV, "Split-Brain detected, manually solved. "
2511 "Sync from %s node\n",
2512 (hg < 0) ? "peer" : "this");
2513 }
2514
2515 if (hg == -100) {
580b9767
LE		 2516 /* FIXME this log message is not correct if we end up here
2517 * after an attempted attach on a diskless node.
2518 * We just refuse to attach -- well, we drop the "connection"
2519 * to that disk, in a way... */
b411b363
PR		 2520 dev_alert(DEV, "Split-Brain detected, dropping connection!\n");
2521 drbd_khelper(mdev, "split-brain");
2522 return C_MASK;
2523 }
2524
2525 if (hg > 0 && mydisk <= D_INCONSISTENT) {
2526 dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n");
2527 return C_MASK;
2528 }
2529
2530 if (hg < 0 && /* by intention we do not use mydisk here. */
2531 mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) {
2532 switch (mdev->net_conf->rr_conflict) {
2533 case ASB_CALL_HELPER:
2534 drbd_khelper(mdev, "pri-lost");
2535 /* fall through */
2536 case ASB_DISCONNECT:
2537 dev_err(DEV, "I shall become SyncTarget, but I am primary!\n");
2538 return C_MASK;
2539 case ASB_VIOLENTLY:
2540 dev_warn(DEV, "Becoming SyncTarget, violating the stable-data"
2541 "assumption\n");
2542 }
2543 }
2544
cf14c2e9
PR		 2545 if (mdev->net_conf->dry_run || test_bit(CONN_DRY_RUN, &mdev->flags)) {
2546 if (hg == 0)
2547 dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n");
2548 else
2549 dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.",
2550 drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET),
2551 abs(hg) >= 2 ? "full" : "bit-map based");
2552 return C_MASK;
2553 }
2554
b411b363
PR		 2555 if (abs(hg) >= 2) {
2556 dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n");
2557 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake"))
2558 return C_MASK;
2559 }
2560
2561 if (hg > 0) { /* become sync source. */
2562 rv = C_WF_BITMAP_S;
2563 } else if (hg < 0) { /* become sync target */
2564 rv = C_WF_BITMAP_T;
2565 } else {
2566 rv = C_CONNECTED;
2567 if (drbd_bm_total_weight(mdev)) {
2568 dev_info(DEV, "No resync, but %lu bits in bitmap!\n",
2569 drbd_bm_total_weight(mdev));
2570 }
2571 }
2572
2573 return rv;
2574}
2575
2576/* returns 1 if invalid */
2577static int cmp_after_sb(enum drbd_after_sb_p peer, enum drbd_after_sb_p self)
2578{
2579 /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */
2580 if ((peer == ASB_DISCARD_REMOTE && self == ASB_DISCARD_LOCAL) ||
2581 (self == ASB_DISCARD_REMOTE && peer == ASB_DISCARD_LOCAL))
2582 return 0;
2583
2584 /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */
2585 if (peer == ASB_DISCARD_REMOTE || peer == ASB_DISCARD_LOCAL ||
2586 self == ASB_DISCARD_REMOTE || self == ASB_DISCARD_LOCAL)
2587 return 1;
2588
2589 /* everything else is valid if they are equal on both sides. */
2590 if (peer == self)
2591 return 0;
2592
2593 /* everything es is invalid. */
2594 return 1;
2595}
2596
2597static int receive_protocol(struct drbd_conf *mdev, struct p_header *h)
2598{
2599 struct p_protocol *p = (struct p_protocol *)h;
2600 int header_size, data_size;
2601 int p_proto, p_after_sb_0p, p_after_sb_1p, p_after_sb_2p;
cf14c2e9 2602 int p_want_lose, p_two_primaries, cf;
b411b363
PR		 2603 char p_integrity_alg[SHARED_SECRET_MAX] = "";
2604
2605 header_size = sizeof(*p) - sizeof(*h);
2606 data_size = h->length - header_size;
2607
2608 if (drbd_recv(mdev, h->payload, header_size) != header_size)
2609 return FALSE;
2610
2611 p_proto = be32_to_cpu(p->protocol);
2612 p_after_sb_0p = be32_to_cpu(p->after_sb_0p);
2613 p_after_sb_1p = be32_to_cpu(p->after_sb_1p);
2614 p_after_sb_2p = be32_to_cpu(p->after_sb_2p);
b411b363 2615 p_two_primaries = be32_to_cpu(p->two_primaries);
cf14c2e9
PR		 2616 cf = be32_to_cpu(p->conn_flags);
2617 p_want_lose = cf & CF_WANT_LOSE;
2618
2619 clear_bit(CONN_DRY_RUN, &mdev->flags);
2620
2621 if (cf & CF_DRY_RUN)
2622 set_bit(CONN_DRY_RUN, &mdev->flags);
b411b363
PR		 2623
2624 if (p_proto != mdev->net_conf->wire_protocol) {
2625 dev_err(DEV, "incompatible communication protocols\n");
2626 goto disconnect;
2627 }
2628
2629 if (cmp_after_sb(p_after_sb_0p, mdev->net_conf->after_sb_0p)) {
2630 dev_err(DEV, "incompatible after-sb-0pri settings\n");
2631 goto disconnect;
2632 }
2633
2634 if (cmp_after_sb(p_after_sb_1p, mdev->net_conf->after_sb_1p)) {
2635 dev_err(DEV, "incompatible after-sb-1pri settings\n");
2636 goto disconnect;
2637 }
2638
2639 if (cmp_after_sb(p_after_sb_2p, mdev->net_conf->after_sb_2p)) {
2640 dev_err(DEV, "incompatible after-sb-2pri settings\n");
2641 goto disconnect;
2642 }
2643
2644 if (p_want_lose && mdev->net_conf->want_lose) {
2645 dev_err(DEV, "both sides have the 'want_lose' flag set\n");
2646 goto disconnect;
2647 }
2648
2649 if (p_two_primaries != mdev->net_conf->two_primaries) {
2650 dev_err(DEV, "incompatible setting of the two-primaries options\n");
2651 goto disconnect;
2652 }
2653
2654 if (mdev->agreed_pro_version >= 87) {
2655 unsigned char *my_alg = mdev->net_conf->integrity_alg;
2656
2657 if (drbd_recv(mdev, p_integrity_alg, data_size) != data_size)
2658 return FALSE;
2659
2660 p_integrity_alg[SHARED_SECRET_MAX-1] = 0;
2661 if (strcmp(p_integrity_alg, my_alg)) {
2662 dev_err(DEV, "incompatible setting of the data-integrity-alg\n");
2663 goto disconnect;
2664 }
2665 dev_info(DEV, "data-integrity-alg: %s\n",
2666 my_alg[0] ? my_alg : (unsigned char *)"<not-used>");
2667 }
2668
2669 return TRUE;
2670
2671disconnect:
2672 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
2673 return FALSE;
2674}
2675
2676/* helper function
2677 * input: alg name, feature name
2678 * return: NULL (alg name was "")
2679 * ERR_PTR(error) if something goes wrong
2680 * or the crypto hash ptr, if it worked out ok. */
2681struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev,
2682 const char *alg, const char *name)
2683{
2684 struct crypto_hash *tfm;
2685
2686 if (!alg[0])
2687 return NULL;
2688
2689 tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC);
2690 if (IS_ERR(tfm)) {
2691 dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n",
2692 alg, name, PTR_ERR(tfm));
2693 return tfm;
2694 }
2695 if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) {
2696 crypto_free_hash(tfm);
2697 dev_err(DEV, "\"%s\" is not a digest (%s)\n", alg, name);
2698 return ERR_PTR(-EINVAL);
2699 }
2700 return tfm;
2701}
2702
2703static int receive_SyncParam(struct drbd_conf *mdev, struct p_header *h)
2704{
2705 int ok = TRUE;
2706 struct p_rs_param_89 *p = (struct p_rs_param_89 *)h;
2707 unsigned int header_size, data_size, exp_max_sz;
2708 struct crypto_hash *verify_tfm = NULL;
2709 struct crypto_hash *csums_tfm = NULL;
2710 const int apv = mdev->agreed_pro_version;
2711
2712 exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param)
2713 : apv == 88 ? sizeof(struct p_rs_param)
2714 + SHARED_SECRET_MAX
2715 : /* 89 */ sizeof(struct p_rs_param_89);
2716
2717 if (h->length > exp_max_sz) {
2718 dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n",
2719 h->length, exp_max_sz);
2720 return FALSE;
2721 }
2722
2723 if (apv <= 88) {
2724 header_size = sizeof(struct p_rs_param) - sizeof(*h);
2725 data_size = h->length - header_size;
2726 } else /* apv >= 89 */ {
2727 header_size = sizeof(struct p_rs_param_89) - sizeof(*h);
2728 data_size = h->length - header_size;
2729 D_ASSERT(data_size == 0);
2730 }
2731
2732 /* initialize verify_alg and csums_alg */
2733 memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX);
2734
2735 if (drbd_recv(mdev, h->payload, header_size) != header_size)
2736 return FALSE;
2737
2738 mdev->sync_conf.rate = be32_to_cpu(p->rate);
2739
2740 if (apv >= 88) {
2741 if (apv == 88) {
2742 if (data_size > SHARED_SECRET_MAX) {
2743 dev_err(DEV, "verify-alg too long, "
2744 "peer wants %u, accepting only %u byte\n",
2745 data_size, SHARED_SECRET_MAX);
2746 return FALSE;
2747 }
2748
2749 if (drbd_recv(mdev, p->verify_alg, data_size) != data_size)
2750 return FALSE;
2751
2752 /* we expect NUL terminated string */
2753 /* but just in case someone tries to be evil */
2754 D_ASSERT(p->verify_alg[data_size-1] == 0);
2755 p->verify_alg[data_size-1] = 0;
2756
2757 } else /* apv >= 89 */ {
2758 /* we still expect NUL terminated strings */
2759 /* but just in case someone tries to be evil */
2760 D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0);
2761 D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0);
2762 p->verify_alg[SHARED_SECRET_MAX-1] = 0;
2763 p->csums_alg[SHARED_SECRET_MAX-1] = 0;
2764 }
2765
2766 if (strcmp(mdev->sync_conf.verify_alg, p->verify_alg)) {
2767 if (mdev->state.conn == C_WF_REPORT_PARAMS) {
2768 dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n",
2769 mdev->sync_conf.verify_alg, p->verify_alg);
2770 goto disconnect;
2771 }
2772 verify_tfm = drbd_crypto_alloc_digest_safe(mdev,
2773 p->verify_alg, "verify-alg");
2774 if (IS_ERR(verify_tfm)) {
2775 verify_tfm = NULL;
2776 goto disconnect;
2777 }
2778 }
2779
2780 if (apv >= 89 && strcmp(mdev->sync_conf.csums_alg, p->csums_alg)) {
2781 if (mdev->state.conn == C_WF_REPORT_PARAMS) {
2782 dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n",
2783 mdev->sync_conf.csums_alg, p->csums_alg);
2784 goto disconnect;
2785 }
2786 csums_tfm = drbd_crypto_alloc_digest_safe(mdev,
2787 p->csums_alg, "csums-alg");
2788 if (IS_ERR(csums_tfm)) {
2789 csums_tfm = NULL;
2790 goto disconnect;
2791 }
2792 }
2793
2794
2795 spin_lock(&mdev->peer_seq_lock);
2796 /* lock against drbd_nl_syncer_conf() */
2797 if (verify_tfm) {
2798 strcpy(mdev->sync_conf.verify_alg, p->verify_alg);
2799 mdev->sync_conf.verify_alg_len = strlen(p->verify_alg) + 1;
2800 crypto_free_hash(mdev->verify_tfm);
2801 mdev->verify_tfm = verify_tfm;
2802 dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg);
2803 }
2804 if (csums_tfm) {
2805 strcpy(mdev->sync_conf.csums_alg, p->csums_alg);
2806 mdev->sync_conf.csums_alg_len = strlen(p->csums_alg) + 1;
2807 crypto_free_hash(mdev->csums_tfm);
2808 mdev->csums_tfm = csums_tfm;
2809 dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg);
2810 }
2811 spin_unlock(&mdev->peer_seq_lock);
2812 }
2813
2814 return ok;
2815disconnect:
2816 /* just for completeness: actually not needed,
2817 * as this is not reached if csums_tfm was ok. */
2818 crypto_free_hash(csums_tfm);
2819 /* but free the verify_tfm again, if csums_tfm did not work out */
2820 crypto_free_hash(verify_tfm);
2821 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
2822 return FALSE;
2823}
2824
2825static void drbd_setup_order_type(struct drbd_conf *mdev, int peer)
2826{
2827 /* sorry, we currently have no working implementation
2828 * of distributed TCQ */
2829}
2830
2831/* warn if the arguments differ by more than 12.5% */
2832static void warn_if_differ_considerably(struct drbd_conf *mdev,
2833 const char *s, sector_t a, sector_t b)
2834{
2835 sector_t d;
2836 if (a == 0 || b == 0)
2837 return;
2838 d = (a > b) ? (a - b) : (b - a);
2839 if (d > (a>>3) || d > (b>>3))
2840 dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s,
2841 (unsigned long long)a, (unsigned long long)b);
2842}
2843
2844static int receive_sizes(struct drbd_conf *mdev, struct p_header *h)
2845{
2846 struct p_sizes *p = (struct p_sizes *)h;
2847 enum determine_dev_size dd = unchanged;
2848 unsigned int max_seg_s;
2849 sector_t p_size, p_usize, my_usize;
2850 int ldsc = 0; /* local disk size changed */
2851 enum drbd_conns nconn;
2852
2853 ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE;
2854 if (drbd_recv(mdev, h->payload, h->length) != h->length)
2855 return FALSE;
2856
2857 p_size = be64_to_cpu(p->d_size);
2858 p_usize = be64_to_cpu(p->u_size);
2859
2860 if (p_size == 0 && mdev->state.disk == D_DISKLESS) {
2861 dev_err(DEV, "some backing storage is needed\n");
2862 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
2863 return FALSE;
2864 }
2865
2866 /* just store the peer's disk size for now.
2867 * we still need to figure out whether we accept that. */
2868 mdev->p_size = p_size;
2869
2870#define min_not_zero(l, r) (l == 0) ? r : ((r == 0) ? l : min(l, r))
2871 if (get_ldev(mdev)) {
2872 warn_if_differ_considerably(mdev, "lower level device sizes",
2873 p_size, drbd_get_max_capacity(mdev->ldev));
2874 warn_if_differ_considerably(mdev, "user requested size",
2875 p_usize, mdev->ldev->dc.disk_size);
2876
2877 /* if this is the first connect, or an otherwise expected
2878 * param exchange, choose the minimum */
2879 if (mdev->state.conn == C_WF_REPORT_PARAMS)
2880 p_usize = min_not_zero((sector_t)mdev->ldev->dc.disk_size,
2881 p_usize);
2882
2883 my_usize = mdev->ldev->dc.disk_size;
2884
2885 if (mdev->ldev->dc.disk_size != p_usize) {
2886 mdev->ldev->dc.disk_size = p_usize;
2887 dev_info(DEV, "Peer sets u_size to %lu sectors\n",
2888 (unsigned long)mdev->ldev->dc.disk_size);
2889 }
2890
2891 /* Never shrink a device with usable data during connect.
2892 But allow online shrinking if we are connected. */
a393db6f 2893 if (drbd_new_dev_size(mdev, mdev->ldev, 0) <
b411b363
PR		 2894 drbd_get_capacity(mdev->this_bdev) &&
2895 mdev->state.disk >= D_OUTDATED &&
2896 mdev->state.conn < C_CONNECTED) {
2897 dev_err(DEV, "The peer's disk size is too small!\n");
2898 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
2899 mdev->ldev->dc.disk_size = my_usize;
2900 put_ldev(mdev);
2901 return FALSE;
2902 }
2903 put_ldev(mdev);
2904 }
2905#undef min_not_zero
2906
2907 if (get_ldev(mdev)) {
a393db6f 2908 dd = drbd_determin_dev_size(mdev, 0);
b411b363
PR		 2909 put_ldev(mdev);
2910 if (dd == dev_size_error)
2911 return FALSE;
2912 drbd_md_sync(mdev);
2913 } else {
2914 /* I am diskless, need to accept the peer's size. */
2915 drbd_set_my_capacity(mdev, p_size);
2916 }
2917
2918 if (mdev->p_uuid && mdev->state.conn <= C_CONNECTED && get_ldev(mdev)) {
2919 nconn = drbd_sync_handshake(mdev,
2920 mdev->state.peer, mdev->state.pdsk);
2921 put_ldev(mdev);
2922
2923 if (nconn == C_MASK) {
2924 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
2925 return FALSE;
2926 }
2927
2928 if (drbd_request_state(mdev, NS(conn, nconn)) < SS_SUCCESS) {
2929 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
2930 return FALSE;
2931 }
2932 }
2933
2934 if (get_ldev(mdev)) {
2935 if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) {
2936 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
2937 ldsc = 1;
2938 }
2939
2940 max_seg_s = be32_to_cpu(p->max_segment_size);
2941 if (max_seg_s != queue_max_segment_size(mdev->rq_queue))
2942 drbd_setup_queue_param(mdev, max_seg_s);
2943
2944 drbd_setup_order_type(mdev, be32_to_cpu(p->queue_order_type));
2945 put_ldev(mdev);
2946 }
2947
2948 if (mdev->state.conn > C_WF_REPORT_PARAMS) {
2949 if (be64_to_cpu(p->c_size) !=
2950 drbd_get_capacity(mdev->this_bdev) || ldsc) {
2951 /* we have different sizes, probably peer
2952 * needs to know my new size... */
2953 drbd_send_sizes(mdev, 0);
2954 }
2955 if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) ||
2956 (dd == grew && mdev->state.conn == C_CONNECTED)) {
2957 if (mdev->state.pdsk >= D_INCONSISTENT &&
2958 mdev->state.disk >= D_INCONSISTENT)
2959 resync_after_online_grow(mdev);
2960 else
2961 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
2962 }
2963 }
2964
2965 return TRUE;
2966}
2967
2968static int receive_uuids(struct drbd_conf *mdev, struct p_header *h)
2969{
2970 struct p_uuids *p = (struct p_uuids *)h;
2971 u64 *p_uuid;
2972 int i;
2973
2974 ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE;
2975 if (drbd_recv(mdev, h->payload, h->length) != h->length)
2976 return FALSE;
2977
2978 p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO);
2979
2980 for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++)
2981 p_uuid[i] = be64_to_cpu(p->uuid[i]);
2982
2983 kfree(mdev->p_uuid);
2984 mdev->p_uuid = p_uuid;
2985
2986 if (mdev->state.conn < C_CONNECTED &&
2987 mdev->state.disk < D_INCONSISTENT &&
2988 mdev->state.role == R_PRIMARY &&
2989 (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) {
2990 dev_err(DEV, "Can only connect to data with current UUID=%016llX\n",
2991 (unsigned long long)mdev->ed_uuid);
2992 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
2993 return FALSE;
2994 }
2995
2996 if (get_ldev(mdev)) {
2997 int skip_initial_sync =
2998 mdev->state.conn == C_CONNECTED &&
2999 mdev->agreed_pro_version >= 90 &&
3000 mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED &&
3001 (p_uuid[UI_FLAGS] & 8);
3002 if (skip_initial_sync) {
3003 dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n");
3004 drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write,
3005 "clear_n_write from receive_uuids");
3006 _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]);
3007 _drbd_uuid_set(mdev, UI_BITMAP, 0);
3008 _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
3009 CS_VERBOSE, NULL);
3010 drbd_md_sync(mdev);
3011 }
3012 put_ldev(mdev);
3013 }
3014
3015 /* Before we test for the disk state, we should wait until an eventually
3016 ongoing cluster wide state change is finished. That is important if
3017 we are primary and are detaching from our disk. We need to see the
3018 new disk state... */
3019 wait_event(mdev->misc_wait, !test_bit(CLUSTER_ST_CHANGE, &mdev->flags));
3020 if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT)
3021 drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]);
3022
3023 return TRUE;
3024}
3025
3026/**
3027 * convert_state() - Converts the peer's view of the cluster state to our point of view
3028 * @ps: The state as seen by the peer.
3029 */
3030static union drbd_state convert_state(union drbd_state ps)
3031{
3032 union drbd_state ms;
3033
3034 static enum drbd_conns c_tab[] = {
3035 [C_CONNECTED] = C_CONNECTED,
3036
3037 [C_STARTING_SYNC_S] = C_STARTING_SYNC_T,
3038 [C_STARTING_SYNC_T] = C_STARTING_SYNC_S,
3039 [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */
3040 [C_VERIFY_S] = C_VERIFY_T,
3041 [C_MASK] = C_MASK,
3042 };
3043
3044 ms.i = ps.i;
3045
3046 ms.conn = c_tab[ps.conn];
3047 ms.peer = ps.role;
3048 ms.role = ps.peer;
3049 ms.pdsk = ps.disk;
3050 ms.disk = ps.pdsk;
3051 ms.peer_isp = (ps.aftr_isp | ps.user_isp);
3052
3053 return ms;
3054}
3055
3056static int receive_req_state(struct drbd_conf *mdev, struct p_header *h)
3057{
3058 struct p_req_state *p = (struct p_req_state *)h;
3059 union drbd_state mask, val;
3060 int rv;
3061
3062 ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE;
3063 if (drbd_recv(mdev, h->payload, h->length) != h->length)
3064 return FALSE;
3065
3066 mask.i = be32_to_cpu(p->mask);
3067 val.i = be32_to_cpu(p->val);
3068
3069 if (test_bit(DISCARD_CONCURRENT, &mdev->flags) &&
3070 test_bit(CLUSTER_ST_CHANGE, &mdev->flags)) {
3071 drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG);
3072 return TRUE;
3073 }
3074
3075 mask = convert_state(mask);
3076 val = convert_state(val);
3077
3078 rv = drbd_change_state(mdev, CS_VERBOSE, mask, val);
3079
3080 drbd_send_sr_reply(mdev, rv);
3081 drbd_md_sync(mdev);
3082
3083 return TRUE;
3084}
3085
3086static int receive_state(struct drbd_conf *mdev, struct p_header *h)
3087{
3088 struct p_state *p = (struct p_state *)h;
3089 enum drbd_conns nconn, oconn;
3090 union drbd_state ns, peer_state;
3091 enum drbd_disk_state real_peer_disk;
3092 int rv;
3093
3094 ERR_IF(h->length != (sizeof(*p)-sizeof(*h)))
3095 return FALSE;
3096
3097 if (drbd_recv(mdev, h->payload, h->length) != h->length)
3098 return FALSE;
3099
3100 peer_state.i = be32_to_cpu(p->state);
3101
3102 real_peer_disk = peer_state.disk;
3103 if (peer_state.disk == D_NEGOTIATING) {
3104 real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT;
3105 dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk));
3106 }
3107
3108 spin_lock_irq(&mdev->req_lock);
3109 retry:
3110 oconn = nconn = mdev->state.conn;
3111 spin_unlock_irq(&mdev->req_lock);
3112
3113 if (nconn == C_WF_REPORT_PARAMS)
3114 nconn = C_CONNECTED;
3115
3116 if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING &&
3117 get_ldev_if_state(mdev, D_NEGOTIATING)) {
3118 int cr; /* consider resync */
3119
3120 /* if we established a new connection */
3121 cr = (oconn < C_CONNECTED);
3122 /* if we had an established connection
3123 * and one of the nodes newly attaches a disk */
3124 cr |= (oconn == C_CONNECTED &&
3125 (peer_state.disk == D_NEGOTIATING ||
3126 mdev->state.disk == D_NEGOTIATING));
3127 /* if we have both been inconsistent, and the peer has been
3128 * forced to be UpToDate with --overwrite-data */
3129 cr |= test_bit(CONSIDER_RESYNC, &mdev->flags);
3130 /* if we had been plain connected, and the admin requested to
3131 * start a sync by "invalidate" or "invalidate-remote" */
3132 cr |= (oconn == C_CONNECTED &&
3133 (peer_state.conn >= C_STARTING_SYNC_S &&
3134 peer_state.conn <= C_WF_BITMAP_T));
3135
3136 if (cr)
3137 nconn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk);
3138
3139 put_ldev(mdev);
3140 if (nconn == C_MASK) {
580b9767 3141 nconn = C_CONNECTED;
b411b363
PR		 3142 if (mdev->state.disk == D_NEGOTIATING) {
3143 drbd_force_state(mdev, NS(disk, D_DISKLESS));
b411b363
PR		 3144 } else if (peer_state.disk == D_NEGOTIATING) {
3145 dev_err(DEV, "Disk attach process on the peer node was aborted.\n");
3146 peer_state.disk = D_DISKLESS;
580b9767 3147 real_peer_disk = D_DISKLESS;
b411b363 3148 } else {
cf14c2e9
PR		 3149 if (test_and_clear_bit(CONN_DRY_RUN, &mdev->flags))
3150 return FALSE;
b411b363
PR		 3151 D_ASSERT(oconn == C_WF_REPORT_PARAMS);
3152 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
3153 return FALSE;
3154 }
3155 }
3156 }
3157
3158 spin_lock_irq(&mdev->req_lock);
3159 if (mdev->state.conn != oconn)
3160 goto retry;
3161 clear_bit(CONSIDER_RESYNC, &mdev->flags);
3162 ns.i = mdev->state.i;
3163 ns.conn = nconn;
3164 ns.peer = peer_state.role;
3165 ns.pdsk = real_peer_disk;
3166 ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp);
3167 if ((nconn == C_CONNECTED || nconn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING)
3168 ns.disk = mdev->new_state_tmp.disk;
3169
3170 rv = _drbd_set_state(mdev, ns, CS_VERBOSE | CS_HARD, NULL);
3171 ns = mdev->state;
3172 spin_unlock_irq(&mdev->req_lock);
3173
3174 if (rv < SS_SUCCESS) {
3175 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
3176 return FALSE;
3177 }
3178
3179 if (oconn > C_WF_REPORT_PARAMS) {
3180 if (nconn > C_CONNECTED && peer_state.conn <= C_CONNECTED &&
3181 peer_state.disk != D_NEGOTIATING ) {
3182 /* we want resync, peer has not yet decided to sync... */
3183 /* Nowadays only used when forcing a node into primary role and
3184 setting its disk to UpToDate with that */
3185 drbd_send_uuids(mdev);
3186 drbd_send_state(mdev);
3187 }
3188 }
3189
3190 mdev->net_conf->want_lose = 0;
3191
3192 drbd_md_sync(mdev); /* update connected indicator, la_size, ... */
3193
3194 return TRUE;
3195}
3196
3197static int receive_sync_uuid(struct drbd_conf *mdev, struct p_header *h)
3198{
3199 struct p_rs_uuid *p = (struct p_rs_uuid *)h;
3200
3201 wait_event(mdev->misc_wait,
3202 mdev->state.conn == C_WF_SYNC_UUID ||
3203 mdev->state.conn < C_CONNECTED ||
3204 mdev->state.disk < D_NEGOTIATING);
3205
3206 /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */
3207
3208 ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE;
3209 if (drbd_recv(mdev, h->payload, h->length) != h->length)
3210 return FALSE;
3211
3212 /* Here the _drbd_uuid_ functions are right, current should
3213 _not_ be rotated into the history */
3214 if (get_ldev_if_state(mdev, D_NEGOTIATING)) {
3215 _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid));
3216 _drbd_uuid_set(mdev, UI_BITMAP, 0UL);
3217
3218 drbd_start_resync(mdev, C_SYNC_TARGET);
3219
3220 put_ldev(mdev);
3221 } else
3222 dev_err(DEV, "Ignoring SyncUUID packet!\n");
3223
3224 return TRUE;
3225}
3226
3227enum receive_bitmap_ret { OK, DONE, FAILED };
3228
3229static enum receive_bitmap_ret
3230receive_bitmap_plain(struct drbd_conf *mdev, struct p_header *h,
3231 unsigned long *buffer, struct bm_xfer_ctx *c)
3232{
3233 unsigned num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset);
3234 unsigned want = num_words * sizeof(long);
3235
3236 if (want != h->length) {
3237 dev_err(DEV, "%s:want (%u) != h->length (%u)\n", __func__, want, h->length);
3238 return FAILED;
3239 }
3240 if (want == 0)
3241 return DONE;
3242 if (drbd_recv(mdev, buffer, want) != want)
3243 return FAILED;
3244
3245 drbd_bm_merge_lel(mdev, c->word_offset, num_words, buffer);
3246
3247 c->word_offset += num_words;
3248 c->bit_offset = c->word_offset * BITS_PER_LONG;
3249 if (c->bit_offset > c->bm_bits)
3250 c->bit_offset = c->bm_bits;
3251
3252 return OK;
3253}
3254
3255static enum receive_bitmap_ret
3256recv_bm_rle_bits(struct drbd_conf *mdev,
3257 struct p_compressed_bm *p,
3258 struct bm_xfer_ctx *c)
3259{
3260 struct bitstream bs;
3261 u64 look_ahead;
3262 u64 rl;
3263 u64 tmp;
3264 unsigned long s = c->bit_offset;
3265 unsigned long e;
3266 int len = p->head.length - (sizeof(*p) - sizeof(p->head));
3267 int toggle = DCBP_get_start(p);
3268 int have;
3269 int bits;
3270
3271 bitstream_init(&bs, p->code, len, DCBP_get_pad_bits(p));
3272
3273 bits = bitstream_get_bits(&bs, &look_ahead, 64);
3274 if (bits < 0)
3275 return FAILED;
3276
3277 for (have = bits; have > 0; s += rl, toggle = !toggle) {
3278 bits = vli_decode_bits(&rl, look_ahead);
3279 if (bits <= 0)
3280 return FAILED;
3281
3282 if (toggle) {
3283 e = s + rl -1;
3284 if (e >= c->bm_bits) {
3285 dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e);
3286 return FAILED;
3287 }
3288 _drbd_bm_set_bits(mdev, s, e);
3289 }
3290
3291 if (have < bits) {
3292 dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n",
3293 have, bits, look_ahead,
3294 (unsigned int)(bs.cur.b - p->code),
3295 (unsigned int)bs.buf_len);
3296 return FAILED;
3297 }
3298 look_ahead >>= bits;
3299 have -= bits;
3300
3301 bits = bitstream_get_bits(&bs, &tmp, 64 - have);
3302 if (bits < 0)
3303 return FAILED;
3304 look_ahead |= tmp << have;
3305 have += bits;
3306 }
3307
3308 c->bit_offset = s;
3309 bm_xfer_ctx_bit_to_word_offset(c);
3310
3311 return (s == c->bm_bits) ? DONE : OK;
3312}
3313
3314static enum receive_bitmap_ret
3315decode_bitmap_c(struct drbd_conf *mdev,
3316 struct p_compressed_bm *p,
3317 struct bm_xfer_ctx *c)
3318{
3319 if (DCBP_get_code(p) == RLE_VLI_Bits)
3320 return recv_bm_rle_bits(mdev, p, c);
3321
3322 /* other variants had been implemented for evaluation,
3323 * but have been dropped as this one turned out to be "best"
3324 * during all our tests. */
3325
3326 dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding);
3327 drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR));
3328 return FAILED;
3329}
3330
3331void INFO_bm_xfer_stats(struct drbd_conf *mdev,
3332 const char *direction, struct bm_xfer_ctx *c)
3333{
3334 /* what would it take to transfer it "plaintext" */
3335 unsigned plain = sizeof(struct p_header) *
3336 ((c->bm_words+BM_PACKET_WORDS-1)/BM_PACKET_WORDS+1)
3337 + c->bm_words * sizeof(long);
3338 unsigned total = c->bytes[0] + c->bytes[1];
3339 unsigned r;
3340
3341 /* total can not be zero. but just in case: */
3342 if (total == 0)
3343 return;
3344
3345 /* don't report if not compressed */
3346 if (total >= plain)
3347 return;
3348
3349 /* total < plain. check for overflow, still */
3350 r = (total > UINT_MAX/1000) ? (total / (plain/1000))
3351 : (1000 * total / plain);
3352
3353 if (r > 1000)
3354 r = 1000;
3355
3356 r = 1000 - r;
3357 dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), "
3358 "total %u; compression: %u.%u%%\n",
3359 direction,
3360 c->bytes[1], c->packets[1],
3361 c->bytes[0], c->packets[0],
3362 total, r/10, r % 10);
3363}
3364
3365/* Since we are processing the bitfield from lower addresses to higher,
3366 it does not matter if the process it in 32 bit chunks or 64 bit
3367 chunks as long as it is little endian. (Understand it as byte stream,
3368 beginning with the lowest byte...) If we would use big endian
3369 we would need to process it from the highest address to the lowest,
3370 in order to be agnostic to the 32 vs 64 bits issue.
3371
3372 returns 0 on failure, 1 if we successfully received it. */
3373static int receive_bitmap(struct drbd_conf *mdev, struct p_header *h)
3374{
3375 struct bm_xfer_ctx c;
3376 void *buffer;
3377 enum receive_bitmap_ret ret;
3378 int ok = FALSE;
3379
3380 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
3381
3382 drbd_bm_lock(mdev, "receive bitmap");
3383
3384 /* maybe we should use some per thread scratch page,
3385 * and allocate that during initial device creation? */
3386 buffer = (unsigned long *) __get_free_page(GFP_NOIO);
3387 if (!buffer) {
3388 dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__);
3389 goto out;
3390 }
3391
3392 c = (struct bm_xfer_ctx) {
3393 .bm_bits = drbd_bm_bits(mdev),
3394 .bm_words = drbd_bm_words(mdev),
3395 };
3396
3397 do {
3398 if (h->command == P_BITMAP) {
3399 ret = receive_bitmap_plain(mdev, h, buffer, &c);
3400 } else if (h->command == P_COMPRESSED_BITMAP) {
3401 /* MAYBE: sanity check that we speak proto >= 90,
3402 * and the feature is enabled! */
3403 struct p_compressed_bm *p;
3404
3405 if (h->length > BM_PACKET_PAYLOAD_BYTES) {
3406 dev_err(DEV, "ReportCBitmap packet too large\n");
3407 goto out;
3408 }
3409 /* use the page buff */
3410 p = buffer;
3411 memcpy(p, h, sizeof(*h));
3412 if (drbd_recv(mdev, p->head.payload, h->length) != h->length)
3413 goto out;
3414 if (p->head.length <= (sizeof(*p) - sizeof(p->head))) {
3415 dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", p->head.length);
3416 return FAILED;
3417 }
3418 ret = decode_bitmap_c(mdev, p, &c);
3419 } else {
3420 dev_warn(DEV, "receive_bitmap: h->command neither ReportBitMap nor ReportCBitMap (is 0x%x)", h->command);
3421 goto out;
3422 }
3423
3424 c.packets[h->command == P_BITMAP]++;
3425 c.bytes[h->command == P_BITMAP] += sizeof(struct p_header) + h->length;
3426
3427 if (ret != OK)
3428 break;
3429
3430 if (!drbd_recv_header(mdev, h))
3431 goto out;
3432 } while (ret == OK);
3433 if (ret == FAILED)
3434 goto out;
3435
3436 INFO_bm_xfer_stats(mdev, "receive", &c);
3437
3438 if (mdev->state.conn == C_WF_BITMAP_T) {
3439 ok = !drbd_send_bitmap(mdev);
3440 if (!ok)
3441 goto out;
3442 /* Omit CS_ORDERED with this state transition to avoid deadlocks. */
3443 ok = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE);
3444 D_ASSERT(ok == SS_SUCCESS);
3445 } else if (mdev->state.conn != C_WF_BITMAP_S) {
3446 /* admin may have requested C_DISCONNECTING,
3447 * other threads may have noticed network errors */
3448 dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n",
3449 drbd_conn_str(mdev->state.conn));
3450 }
3451
3452 ok = TRUE;
3453 out:
3454 drbd_bm_unlock(mdev);
3455 if (ok && mdev->state.conn == C_WF_BITMAP_S)
3456 drbd_start_resync(mdev, C_SYNC_SOURCE);
3457 free_page((unsigned long) buffer);
3458 return ok;
3459}
3460
3461static int receive_skip(struct drbd_conf *mdev, struct p_header *h)
3462{
3463 /* TODO zero copy sink :) */
3464 static char sink[128];
3465 int size, want, r;
3466
3467 dev_warn(DEV, "skipping unknown optional packet type %d, l: %d!\n",
3468 h->command, h->length);
3469
3470 size = h->length;
3471 while (size > 0) {
3472 want = min_t(int, size, sizeof(sink));
3473 r = drbd_recv(mdev, sink, want);
3474 ERR_IF(r <= 0) break;
3475 size -= r;
3476 }
3477 return size == 0;
3478}
3479
3480static int receive_UnplugRemote(struct drbd_conf *mdev, struct p_header *h)
3481{
3482 if (mdev->state.disk >= D_INCONSISTENT)
3483 drbd_kick_lo(mdev);
3484
3485 /* Make sure we've acked all the TCP data associated
3486 * with the data requests being unplugged */
3487 drbd_tcp_quickack(mdev->data.socket);
3488
3489 return TRUE;
3490}
3491
3492typedef int (*drbd_cmd_handler_f)(struct drbd_conf *, struct p_header *);
3493
3494static drbd_cmd_handler_f drbd_default_handler[] = {
3495 [P_DATA] = receive_Data,
3496 [P_DATA_REPLY] = receive_DataReply,
3497 [P_RS_DATA_REPLY] = receive_RSDataReply,
3498 [P_BARRIER] = receive_Barrier,
3499 [P_BITMAP] = receive_bitmap,
3500 [P_COMPRESSED_BITMAP] = receive_bitmap,
3501 [P_UNPLUG_REMOTE] = receive_UnplugRemote,
3502 [P_DATA_REQUEST] = receive_DataRequest,
3503 [P_RS_DATA_REQUEST] = receive_DataRequest,
3504 [P_SYNC_PARAM] = receive_SyncParam,
3505 [P_SYNC_PARAM89] = receive_SyncParam,
3506 [P_PROTOCOL] = receive_protocol,
3507 [P_UUIDS] = receive_uuids,
3508 [P_SIZES] = receive_sizes,
3509 [P_STATE] = receive_state,
3510 [P_STATE_CHG_REQ] = receive_req_state,
3511 [P_SYNC_UUID] = receive_sync_uuid,
3512 [P_OV_REQUEST] = receive_DataRequest,
3513 [P_OV_REPLY] = receive_DataRequest,
3514 [P_CSUM_RS_REQUEST] = receive_DataRequest,
3515 /* anything missing from this table is in
3516 * the asender_tbl, see get_asender_cmd */
3517 [P_MAX_CMD] = NULL,
3518};
3519
3520static drbd_cmd_handler_f *drbd_cmd_handler = drbd_default_handler;
3521static drbd_cmd_handler_f *drbd_opt_cmd_handler;
3522
3523static void drbdd(struct drbd_conf *mdev)
3524{
3525 drbd_cmd_handler_f handler;
3526 struct p_header *header = &mdev->data.rbuf.header;
3527
3528 while (get_t_state(&mdev->receiver) == Running) {
3529 drbd_thread_current_set_cpu(mdev);
0b33a916
LE		 3530 if (!drbd_recv_header(mdev, header)) {
3531 drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR));
b411b363 3532 break;
0b33a916 3533 }
b411b363
PR		 3534
3535 if (header->command < P_MAX_CMD)
3536 handler = drbd_cmd_handler[header->command];
3537 else if (P_MAY_IGNORE < header->command
3538 && header->command < P_MAX_OPT_CMD)
3539 handler = drbd_opt_cmd_handler[header->command-P_MAY_IGNORE];
3540 else if (header->command > P_MAX_OPT_CMD)
3541 handler = receive_skip;
3542 else
3543 handler = NULL;
3544
3545 if (unlikely(!handler)) {
3546 dev_err(DEV, "unknown packet type %d, l: %d!\n",
3547 header->command, header->length);
3548 drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR));
3549 break;
3550 }
3551 if (unlikely(!handler(mdev, header))) {
3552 dev_err(DEV, "error receiving %s, l: %d!\n",
3553 cmdname(header->command), header->length);
3554 drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR));
3555 break;
3556 }
b411b363
PR		 3557 }
3558}
3559
3560static void drbd_fail_pending_reads(struct drbd_conf *mdev)
3561{
3562 struct hlist_head *slot;
3563 struct hlist_node *pos;
3564 struct hlist_node *tmp;
3565 struct drbd_request *req;
3566 int i;
3567
3568 /*
3569 * Application READ requests
3570 */
3571 spin_lock_irq(&mdev->req_lock);
3572 for (i = 0; i < APP_R_HSIZE; i++) {
3573 slot = mdev->app_reads_hash+i;
3574 hlist_for_each_entry_safe(req, pos, tmp, slot, colision) {
3575 /* it may (but should not any longer!)
3576 * be on the work queue; if that assert triggers,
3577 * we need to also grab the
3578 * spin_lock_irq(&mdev->data.work.q_lock);
3579 * and list_del_init here. */
3580 D_ASSERT(list_empty(&req->w.list));
3581 /* It would be nice to complete outside of spinlock.
3582 * But this is easier for now. */
3583 _req_mod(req, connection_lost_while_pending);
3584 }
3585 }
3586 for (i = 0; i < APP_R_HSIZE; i++)
3587 if (!hlist_empty(mdev->app_reads_hash+i))
3588 dev_warn(DEV, "ASSERT FAILED: app_reads_hash[%d].first: "
3589 "%p, should be NULL\n", i, mdev->app_reads_hash[i].first);
3590
3591 memset(mdev->app_reads_hash, 0, APP_R_HSIZE*sizeof(void *));
3592 spin_unlock_irq(&mdev->req_lock);
3593}
3594
3595void drbd_flush_workqueue(struct drbd_conf *mdev)
3596{
3597 struct drbd_wq_barrier barr;
3598
3599 barr.w.cb = w_prev_work_done;
3600 init_completion(&barr.done);
3601 drbd_queue_work(&mdev->data.work, &barr.w);
3602 wait_for_completion(&barr.done);
3603}
3604
3605static void drbd_disconnect(struct drbd_conf *mdev)
3606{
3607 enum drbd_fencing_p fp;
3608 union drbd_state os, ns;
3609 int rv = SS_UNKNOWN_ERROR;
3610 unsigned int i;
3611
3612 if (mdev->state.conn == C_STANDALONE)
3613 return;
3614 if (mdev->state.conn >= C_WF_CONNECTION)
3615 dev_err(DEV, "ASSERT FAILED cstate = %s, expected < WFConnection\n",
3616 drbd_conn_str(mdev->state.conn));
3617
3618 /* asender does not clean up anything. it must not interfere, either */
3619 drbd_thread_stop(&mdev->asender);
b411b363 3620 drbd_free_sock(mdev);
b411b363
PR		 3621
3622 spin_lock_irq(&mdev->req_lock);
3623 _drbd_wait_ee_list_empty(mdev, &mdev->active_ee);
3624 _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee);
3625 _drbd_wait_ee_list_empty(mdev, &mdev->read_ee);
3626 spin_unlock_irq(&mdev->req_lock);
3627
3628 /* We do not have data structures that would allow us to
3629 * get the rs_pending_cnt down to 0 again.
3630 * * On C_SYNC_TARGET we do not have any data structures describing
3631 * the pending RSDataRequest's we have sent.
3632 * * On C_SYNC_SOURCE there is no data structure that tracks
3633 * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget.
3634 * And no, it is not the sum of the reference counts in the
3635 * resync_LRU. The resync_LRU tracks the whole operation including
3636 * the disk-IO, while the rs_pending_cnt only tracks the blocks
3637 * on the fly. */
3638 drbd_rs_cancel_all(mdev);
3639 mdev->rs_total = 0;
3640 mdev->rs_failed = 0;
3641 atomic_set(&mdev->rs_pending_cnt, 0);
3642 wake_up(&mdev->misc_wait);
3643
3644 /* make sure syncer is stopped and w_resume_next_sg queued */
3645 del_timer_sync(&mdev->resync_timer);
3646 set_bit(STOP_SYNC_TIMER, &mdev->flags);
3647 resync_timer_fn((unsigned long)mdev);
3648
b411b363
PR		 3649 /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier,
3650 * w_make_resync_request etc. which may still be on the worker queue
3651 * to be "canceled" */
3652 drbd_flush_workqueue(mdev);
3653
3654 /* This also does reclaim_net_ee(). If we do this too early, we might
3655 * miss some resync ee and pages.*/
3656 drbd_process_done_ee(mdev);
3657
3658 kfree(mdev->p_uuid);
3659 mdev->p_uuid = NULL;
3660
3661 if (!mdev->state.susp)
3662 tl_clear(mdev);
3663
3664 drbd_fail_pending_reads(mdev);
3665
3666 dev_info(DEV, "Connection closed\n");
3667
3668 drbd_md_sync(mdev);
3669
3670 fp = FP_DONT_CARE;
3671 if (get_ldev(mdev)) {
3672 fp = mdev->ldev->dc.fencing;
3673 put_ldev(mdev);
3674 }
3675
3676 if (mdev->state.role == R_PRIMARY) {
3677 if (fp >= FP_RESOURCE && mdev->state.pdsk >= D_UNKNOWN) {
3678 enum drbd_disk_state nps = drbd_try_outdate_peer(mdev);
3679 drbd_request_state(mdev, NS(pdsk, nps));
3680 }
3681 }
3682
3683 spin_lock_irq(&mdev->req_lock);
3684 os = mdev->state;
3685 if (os.conn >= C_UNCONNECTED) {
3686 /* Do not restart in case we are C_DISCONNECTING */
3687 ns = os;
3688 ns.conn = C_UNCONNECTED;
3689 rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
3690 }
3691 spin_unlock_irq(&mdev->req_lock);
3692
3693 if (os.conn == C_DISCONNECTING) {
3694 struct hlist_head *h;
3695 wait_event(mdev->misc_wait, atomic_read(&mdev->net_cnt) == 0);
3696
3697 /* we must not free the tl_hash
3698 * while application io is still on the fly */
3699 wait_event(mdev->misc_wait, atomic_read(&mdev->ap_bio_cnt) == 0);
3700
3701 spin_lock_irq(&mdev->req_lock);
3702 /* paranoia code */
3703 for (h = mdev->ee_hash; h < mdev->ee_hash + mdev->ee_hash_s; h++)
3704 if (h->first)
3705 dev_err(DEV, "ASSERT FAILED ee_hash[%u].first == %p, expected NULL\n",
3706 (int)(h - mdev->ee_hash), h->first);
3707 kfree(mdev->ee_hash);
3708 mdev->ee_hash = NULL;
3709 mdev->ee_hash_s = 0;
3710
3711 /* paranoia code */
3712 for (h = mdev->tl_hash; h < mdev->tl_hash + mdev->tl_hash_s; h++)
3713 if (h->first)
3714 dev_err(DEV, "ASSERT FAILED tl_hash[%u] == %p, expected NULL\n",
3715 (int)(h - mdev->tl_hash), h->first);
3716 kfree(mdev->tl_hash);
3717 mdev->tl_hash = NULL;
3718 mdev->tl_hash_s = 0;
3719 spin_unlock_irq(&mdev->req_lock);
3720
3721 crypto_free_hash(mdev->cram_hmac_tfm);
3722 mdev->cram_hmac_tfm = NULL;
3723
3724 kfree(mdev->net_conf);
3725 mdev->net_conf = NULL;
3726 drbd_request_state(mdev, NS(conn, C_STANDALONE));
3727 }
3728
3729 /* tcp_close and release of sendpage pages can be deferred. I don't
3730 * want to use SO_LINGER, because apparently it can be deferred for
3731 * more than 20 seconds (longest time I checked).
3732 *
3733 * Actually we don't care for exactly when the network stack does its
3734 * put_page(), but release our reference on these pages right here.
3735 */
3736 i = drbd_release_ee(mdev, &mdev->net_ee);
3737 if (i)
3738 dev_info(DEV, "net_ee not empty, killed %u entries\n", i);
3739 i = atomic_read(&mdev->pp_in_use);
3740 if (i)
3741 dev_info(DEV, "pp_in_use = %u, expected 0\n", i);
3742
3743 D_ASSERT(list_empty(&mdev->read_ee));
3744 D_ASSERT(list_empty(&mdev->active_ee));
3745 D_ASSERT(list_empty(&mdev->sync_ee));
3746 D_ASSERT(list_empty(&mdev->done_ee));
3747
3748 /* ok, no more ee's on the fly, it is safe to reset the epoch_size */
3749 atomic_set(&mdev->current_epoch->epoch_size, 0);
3750 D_ASSERT(list_empty(&mdev->current_epoch->list));
3751}
3752
3753/*
3754 * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version
3755 * we can agree on is stored in agreed_pro_version.
3756 *
3757 * feature flags and the reserved array should be enough room for future
3758 * enhancements of the handshake protocol, and possible plugins...
3759 *
3760 * for now, they are expected to be zero, but ignored.
3761 */
3762static int drbd_send_handshake(struct drbd_conf *mdev)
3763{
3764 /* ASSERT current == mdev->receiver ... */
3765 struct p_handshake *p = &mdev->data.sbuf.handshake;
3766 int ok;
3767
3768 if (mutex_lock_interruptible(&mdev->data.mutex)) {
3769 dev_err(DEV, "interrupted during initial handshake\n");
3770 return 0; /* interrupted. not ok. */
3771 }
3772
3773 if (mdev->data.socket == NULL) {
3774 mutex_unlock(&mdev->data.mutex);
3775 return 0;
3776 }
3777
3778 memset(p, 0, sizeof(*p));
3779 p->protocol_min = cpu_to_be32(PRO_VERSION_MIN);
3780 p->protocol_max = cpu_to_be32(PRO_VERSION_MAX);
3781 ok = _drbd_send_cmd( mdev, mdev->data.socket, P_HAND_SHAKE,
3782 (struct p_header *)p, sizeof(*p), 0 );
3783 mutex_unlock(&mdev->data.mutex);
3784 return ok;
3785}
3786
3787/*
3788 * return values:
3789 * 1 yes, we have a valid connection
3790 * 0 oops, did not work out, please try again
3791 * -1 peer talks different language,
3792 * no point in trying again, please go standalone.
3793 */
3794static int drbd_do_handshake(struct drbd_conf *mdev)
3795{
3796 /* ASSERT current == mdev->receiver ... */
3797 struct p_handshake *p = &mdev->data.rbuf.handshake;
3798 const int expect = sizeof(struct p_handshake)
3799 -sizeof(struct p_header);
3800 int rv;
3801
3802 rv = drbd_send_handshake(mdev);
3803 if (!rv)
3804 return 0;
3805
3806 rv = drbd_recv_header(mdev, &p->head);
3807 if (!rv)
3808 return 0;
3809
3810 if (p->head.command != P_HAND_SHAKE) {
3811 dev_err(DEV, "expected HandShake packet, received: %s (0x%04x)\n",
3812 cmdname(p->head.command), p->head.command);
3813 return -1;
3814 }
3815
3816 if (p->head.length != expect) {
3817 dev_err(DEV, "expected HandShake length: %u, received: %u\n",
3818 expect, p->head.length);
3819 return -1;
3820 }
3821
3822 rv = drbd_recv(mdev, &p->head.payload, expect);
3823
3824 if (rv != expect) {
3825 dev_err(DEV, "short read receiving handshake packet: l=%u\n", rv);
3826 return 0;
3827 }
3828
b411b363
PR		 3829 p->protocol_min = be32_to_cpu(p->protocol_min);
3830 p->protocol_max = be32_to_cpu(p->protocol_max);
3831 if (p->protocol_max == 0)
3832 p->protocol_max = p->protocol_min;
3833
3834 if (PRO_VERSION_MAX < p->protocol_min ||
3835 PRO_VERSION_MIN > p->protocol_max)
3836 goto incompat;
3837
3838 mdev->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max);
3839
3840 dev_info(DEV, "Handshake successful: "
3841 "Agreed network protocol version %d\n", mdev->agreed_pro_version);
3842
3843 return 1;
3844
3845 incompat:
3846 dev_err(DEV, "incompatible DRBD dialects: "
3847 "I support %d-%d, peer supports %d-%d\n",
3848 PRO_VERSION_MIN, PRO_VERSION_MAX,
3849 p->protocol_min, p->protocol_max);
3850 return -1;
3851}
3852
3853#if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE)
3854static int drbd_do_auth(struct drbd_conf *mdev)
3855{
3856 dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n");
3857 dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n");
b10d96cb 3858 return -1;
b411b363
PR		 3859}
3860#else
3861#define CHALLENGE_LEN 64
b10d96cb
JT		 3862
3863/* Return value:
3864 1 - auth succeeded,
3865 0 - failed, try again (network error),
3866 -1 - auth failed, don't try again.
3867*/
3868
b411b363
PR		 3869static int drbd_do_auth(struct drbd_conf *mdev)
3870{
3871 char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */
3872 struct scatterlist sg;
3873 char *response = NULL;
3874 char *right_response = NULL;
3875 char *peers_ch = NULL;
3876 struct p_header p;
3877 unsigned int key_len = strlen(mdev->net_conf->shared_secret);
3878 unsigned int resp_size;
3879 struct hash_desc desc;
3880 int rv;
3881
3882 desc.tfm = mdev->cram_hmac_tfm;
3883 desc.flags = 0;
3884
3885 rv = crypto_hash_setkey(mdev->cram_hmac_tfm,
3886 (u8 *)mdev->net_conf->shared_secret, key_len);
3887 if (rv) {
3888 dev_err(DEV, "crypto_hash_setkey() failed with %d\n", rv);
b10d96cb 3889 rv = -1;
b411b363
PR		 3890 goto fail;
3891 }
3892
3893 get_random_bytes(my_challenge, CHALLENGE_LEN);
3894
3895 rv = drbd_send_cmd2(mdev, P_AUTH_CHALLENGE, my_challenge, CHALLENGE_LEN);
3896 if (!rv)
3897 goto fail;
3898
3899 rv = drbd_recv_header(mdev, &p);
3900 if (!rv)
3901 goto fail;
3902
3903 if (p.command != P_AUTH_CHALLENGE) {
3904 dev_err(DEV, "expected AuthChallenge packet, received: %s (0x%04x)\n",
3905 cmdname(p.command), p.command);
3906 rv = 0;
3907 goto fail;
3908 }
3909
3910 if (p.length > CHALLENGE_LEN*2) {
3911 dev_err(DEV, "expected AuthChallenge payload too big.\n");
b10d96cb 3912 rv = -1;
b411b363
PR		 3913 goto fail;
3914 }
3915
3916 peers_ch = kmalloc(p.length, GFP_NOIO);
3917 if (peers_ch == NULL) {
3918 dev_err(DEV, "kmalloc of peers_ch failed\n");
b10d96cb 3919 rv = -1;
b411b363
PR		 3920 goto fail;
3921 }
3922
3923 rv = drbd_recv(mdev, peers_ch, p.length);
3924
3925 if (rv != p.length) {
3926 dev_err(DEV, "short read AuthChallenge: l=%u\n", rv);
3927 rv = 0;
3928 goto fail;
3929 }
3930
3931 resp_size = crypto_hash_digestsize(mdev->cram_hmac_tfm);
3932 response = kmalloc(resp_size, GFP_NOIO);
3933 if (response == NULL) {
3934 dev_err(DEV, "kmalloc of response failed\n");
b10d96cb 3935 rv = -1;
b411b363
PR		 3936 goto fail;
3937 }
3938
3939 sg_init_table(&sg, 1);
3940 sg_set_buf(&sg, peers_ch, p.length);
3941
3942 rv = crypto_hash_digest(&desc, &sg, sg.length, response);
3943 if (rv) {
3944 dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv);
b10d96cb 3945 rv = -1;
b411b363
PR		 3946 goto fail;
3947 }
3948
3949 rv = drbd_send_cmd2(mdev, P_AUTH_RESPONSE, response, resp_size);
3950 if (!rv)
3951 goto fail;
3952
3953 rv = drbd_recv_header(mdev, &p);
3954 if (!rv)
3955 goto fail;
3956
3957 if (p.command != P_AUTH_RESPONSE) {
3958 dev_err(DEV, "expected AuthResponse packet, received: %s (0x%04x)\n",
3959 cmdname(p.command), p.command);
3960 rv = 0;
3961 goto fail;
3962 }
3963
3964 if (p.length != resp_size) {
3965 dev_err(DEV, "expected AuthResponse payload of wrong size\n");
3966 rv = 0;
3967 goto fail;
3968 }
3969
3970 rv = drbd_recv(mdev, response , resp_size);
3971
3972 if (rv != resp_size) {
3973 dev_err(DEV, "short read receiving AuthResponse: l=%u\n", rv);
3974 rv = 0;
3975 goto fail;
3976 }
3977
3978 right_response = kmalloc(resp_size, GFP_NOIO);
2d1ee87d 3979 if (right_response == NULL) {
b411b363 3980 dev_err(DEV, "kmalloc of right_response failed\n");
b10d96cb 3981 rv = -1;
b411b363
PR		 3982 goto fail;
3983 }
3984
3985 sg_set_buf(&sg, my_challenge, CHALLENGE_LEN);
3986
3987 rv = crypto_hash_digest(&desc, &sg, sg.length, right_response);
3988 if (rv) {
3989 dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv);
b10d96cb 3990 rv = -1;
b411b363
PR		 3991 goto fail;
3992 }
3993
3994 rv = !memcmp(response, right_response, resp_size);
3995
3996 if (rv)
3997 dev_info(DEV, "Peer authenticated using %d bytes of '%s' HMAC\n",
3998 resp_size, mdev->net_conf->cram_hmac_alg);
b10d96cb
JT		 3999 else
4000 rv = -1;
b411b363
PR		 4001
4002 fail:
4003 kfree(peers_ch);
4004 kfree(response);
4005 kfree(right_response);
4006
4007 return rv;
4008}
4009#endif
4010
4011int drbdd_init(struct drbd_thread *thi)
4012{
4013 struct drbd_conf *mdev = thi->mdev;
4014 unsigned int minor = mdev_to_minor(mdev);
4015 int h;
4016
4017 sprintf(current->comm, "drbd%d_receiver", minor);
4018
4019 dev_info(DEV, "receiver (re)started\n");
4020
4021 do {
4022 h = drbd_connect(mdev);
4023 if (h == 0) {
4024 drbd_disconnect(mdev);
4025 __set_current_state(TASK_INTERRUPTIBLE);
4026 schedule_timeout(HZ);
4027 }
4028 if (h == -1) {
4029 dev_warn(DEV, "Discarding network configuration.\n");
4030 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
4031 }
4032 } while (h == 0);
4033
4034 if (h > 0) {
4035 if (get_net_conf(mdev)) {
4036 drbdd(mdev);
4037 put_net_conf(mdev);
4038 }
4039 }
4040
4041 drbd_disconnect(mdev);
4042
4043 dev_info(DEV, "receiver terminated\n");
4044 return 0;
4045}
4046
4047/* ********* acknowledge sender ******** */
4048
4049static int got_RqSReply(struct drbd_conf *mdev, struct p_header *h)
4050{
4051 struct p_req_state_reply *p = (struct p_req_state_reply *)h;
4052
4053 int retcode = be32_to_cpu(p->retcode);
4054
4055 if (retcode >= SS_SUCCESS) {
4056 set_bit(CL_ST_CHG_SUCCESS, &mdev->flags);
4057 } else {
4058 set_bit(CL_ST_CHG_FAIL, &mdev->flags);
4059 dev_err(DEV, "Requested state change failed by peer: %s (%d)\n",
4060 drbd_set_st_err_str(retcode), retcode);
4061 }
4062 wake_up(&mdev->state_wait);
4063
4064 return TRUE;
4065}
4066
4067static int got_Ping(struct drbd_conf *mdev, struct p_header *h)
4068{
4069 return drbd_send_ping_ack(mdev);
4070
4071}
4072
4073static int got_PingAck(struct drbd_conf *mdev, struct p_header *h)
4074{
4075 /* restore idle timeout */
4076 mdev->meta.socket->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ;
4077
4078 return TRUE;
4079}
4080
4081static int got_IsInSync(struct drbd_conf *mdev, struct p_header *h)
4082{
4083 struct p_block_ack *p = (struct p_block_ack *)h;
4084 sector_t sector = be64_to_cpu(p->sector);
4085 int blksize = be32_to_cpu(p->blksize);
4086
4087 D_ASSERT(mdev->agreed_pro_version >= 89);
4088
4089 update_peer_seq(mdev, be32_to_cpu(p->seq_num));
4090
4091 drbd_rs_complete_io(mdev, sector);
4092 drbd_set_in_sync(mdev, sector, blksize);
4093 /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */
4094 mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT);
4095 dec_rs_pending(mdev);
4096
4097 return TRUE;
4098}
4099
4100/* when we receive the ACK for a write request,
4101 * verify that we actually know about it */
4102static struct drbd_request *_ack_id_to_req(struct drbd_conf *mdev,
4103 u64 id, sector_t sector)
4104{
4105 struct hlist_head *slot = tl_hash_slot(mdev, sector);
4106 struct hlist_node *n;
4107 struct drbd_request *req;
4108
4109 hlist_for_each_entry(req, n, slot, colision) {
4110 if ((unsigned long)req == (unsigned long)id) {
4111 if (req->sector != sector) {
4112 dev_err(DEV, "_ack_id_to_req: found req %p but it has "
4113 "wrong sector (%llus versus %llus)\n", req,
4114 (unsigned long long)req->sector,
4115 (unsigned long long)sector);
4116 break;
4117 }
4118 return req;
4119 }
4120 }
4121 dev_err(DEV, "_ack_id_to_req: failed to find req %p, sector %llus in list\n",
4122 (void *)(unsigned long)id, (unsigned long long)sector);
4123 return NULL;
4124}
4125
4126typedef struct drbd_request *(req_validator_fn)
4127 (struct drbd_conf *mdev, u64 id, sector_t sector);
4128
4129static int validate_req_change_req_state(struct drbd_conf *mdev,
4130 u64 id, sector_t sector, req_validator_fn validator,
4131 const char *func, enum drbd_req_event what)
4132{
4133 struct drbd_request *req;
4134 struct bio_and_error m;
4135
4136 spin_lock_irq(&mdev->req_lock);
4137 req = validator(mdev, id, sector);
4138 if (unlikely(!req)) {
4139 spin_unlock_irq(&mdev->req_lock);
4140 dev_err(DEV, "%s: got a corrupt block_id/sector pair\n", func);
4141 return FALSE;
4142 }
4143 __req_mod(req, what, &m);
4144 spin_unlock_irq(&mdev->req_lock);
4145
4146 if (m.bio)
4147 complete_master_bio(mdev, &m);
4148 return TRUE;
4149}
4150
4151static int got_BlockAck(struct drbd_conf *mdev, struct p_header *h)
4152{
4153 struct p_block_ack *p = (struct p_block_ack *)h;
4154 sector_t sector = be64_to_cpu(p->sector);
4155 int blksize = be32_to_cpu(p->blksize);
4156 enum drbd_req_event what;
4157
4158 update_peer_seq(mdev, be32_to_cpu(p->seq_num));
4159
4160 if (is_syncer_block_id(p->block_id)) {
4161 drbd_set_in_sync(mdev, sector, blksize);
4162 dec_rs_pending(mdev);
4163 return TRUE;
4164 }
4165 switch (be16_to_cpu(h->command)) {
4166 case P_RS_WRITE_ACK:
4167 D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C);
4168 what = write_acked_by_peer_and_sis;
4169 break;
4170 case P_WRITE_ACK:
4171 D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C);
4172 what = write_acked_by_peer;
4173 break;
4174 case P_RECV_ACK:
4175 D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_B);
4176 what = recv_acked_by_peer;
4177 break;
4178 case P_DISCARD_ACK:
4179 D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C);
4180 what = conflict_discarded_by_peer;
4181 break;
4182 default:
4183 D_ASSERT(0);
4184 return FALSE;
4185 }
4186
4187 return validate_req_change_req_state(mdev, p->block_id, sector,
4188 _ack_id_to_req, __func__ , what);
4189}
4190
4191static int got_NegAck(struct drbd_conf *mdev, struct p_header *h)
4192{
4193 struct p_block_ack *p = (struct p_block_ack *)h;
4194 sector_t sector = be64_to_cpu(p->sector);
4195
4196 if (__ratelimit(&drbd_ratelimit_state))
4197 dev_warn(DEV, "Got NegAck packet. Peer is in troubles?\n");
4198
4199 update_peer_seq(mdev, be32_to_cpu(p->seq_num));
4200
4201 if (is_syncer_block_id(p->block_id)) {
4202 int size = be32_to_cpu(p->blksize);
4203 dec_rs_pending(mdev);
4204 drbd_rs_failed_io(mdev, sector, size);
4205 return TRUE;
4206 }
4207 return validate_req_change_req_state(mdev, p->block_id, sector,
4208 _ack_id_to_req, __func__ , neg_acked);
4209}
4210
4211static int got_NegDReply(struct drbd_conf *mdev, struct p_header *h)
4212{
4213 struct p_block_ack *p = (struct p_block_ack *)h;
4214 sector_t sector = be64_to_cpu(p->sector);
4215
4216 update_peer_seq(mdev, be32_to_cpu(p->seq_num));
4217 dev_err(DEV, "Got NegDReply; Sector %llus, len %u; Fail original request.\n",
4218 (unsigned long long)sector, be32_to_cpu(p->blksize));
4219
4220 return validate_req_change_req_state(mdev, p->block_id, sector,
4221 _ar_id_to_req, __func__ , neg_acked);
4222}
4223
4224static int got_NegRSDReply(struct drbd_conf *mdev, struct p_header *h)
4225{
4226 sector_t sector;
4227 int size;
4228 struct p_block_ack *p = (struct p_block_ack *)h;
4229
4230 sector = be64_to_cpu(p->sector);
4231 size = be32_to_cpu(p->blksize);
4232 D_ASSERT(p->block_id == ID_SYNCER);
4233
4234 update_peer_seq(mdev, be32_to_cpu(p->seq_num));
4235
4236 dec_rs_pending(mdev);
4237
4238 if (get_ldev_if_state(mdev, D_FAILED)) {
4239 drbd_rs_complete_io(mdev, sector);
4240 drbd_rs_failed_io(mdev, sector, size);
4241 put_ldev(mdev);
4242 }
4243
4244 return TRUE;
4245}
4246
4247static int got_BarrierAck(struct drbd_conf *mdev, struct p_header *h)
4248{
4249 struct p_barrier_ack *p = (struct p_barrier_ack *)h;
4250
4251 tl_release(mdev, p->barrier, be32_to_cpu(p->set_size));
4252
4253 return TRUE;
4254}
4255
4256static int got_OVResult(struct drbd_conf *mdev, struct p_header *h)
4257{
4258 struct p_block_ack *p = (struct p_block_ack *)h;
4259 struct drbd_work *w;
4260 sector_t sector;
4261 int size;
4262
4263 sector = be64_to_cpu(p->sector);
4264 size = be32_to_cpu(p->blksize);
4265
4266 update_peer_seq(mdev, be32_to_cpu(p->seq_num));
4267
4268 if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC)
4269 drbd_ov_oos_found(mdev, sector, size);
4270 else
4271 ov_oos_print(mdev);
4272
4273 drbd_rs_complete_io(mdev, sector);
4274 dec_rs_pending(mdev);
4275
4276 if (--mdev->ov_left == 0) {
4277 w = kmalloc(sizeof(*w), GFP_NOIO);
4278 if (w) {
4279 w->cb = w_ov_finished;
4280 drbd_queue_work_front(&mdev->data.work, w);
4281 } else {
4282 dev_err(DEV, "kmalloc(w) failed.");
4283 ov_oos_print(mdev);
4284 drbd_resync_finished(mdev);
4285 }
4286 }
4287 return TRUE;
4288}
4289
4290struct asender_cmd {
4291 size_t pkt_size;
4292 int (*process)(struct drbd_conf *mdev, struct p_header *h);
4293};
4294
4295static struct asender_cmd *get_asender_cmd(int cmd)
4296{
4297 static struct asender_cmd asender_tbl[] = {
4298 /* anything missing from this table is in
4299 * the drbd_cmd_handler (drbd_default_handler) table,
4300 * see the beginning of drbdd() */
4301 [P_PING] = { sizeof(struct p_header), got_Ping },
4302 [P_PING_ACK] = { sizeof(struct p_header), got_PingAck },
4303 [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck },
4304 [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck },
4305 [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck },
4306 [P_DISCARD_ACK] = { sizeof(struct p_block_ack), got_BlockAck },
4307 [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck },
4308 [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply },
4309 [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply},
4310 [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult },
4311 [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck },
4312 [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply },
4313 [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync },
4314 [P_MAX_CMD] = { 0, NULL },
4315 };
4316 if (cmd > P_MAX_CMD || asender_tbl[cmd].process == NULL)
4317 return NULL;
4318 return &asender_tbl[cmd];
4319}
4320
4321int drbd_asender(struct drbd_thread *thi)
4322{
4323 struct drbd_conf *mdev = thi->mdev;
4324 struct p_header *h = &mdev->meta.rbuf.header;
4325 struct asender_cmd *cmd = NULL;
4326
4327 int rv, len;
4328 void *buf = h;
4329 int received = 0;
4330 int expect = sizeof(struct p_header);
4331 int empty;
4332
4333 sprintf(current->comm, "drbd%d_asender", mdev_to_minor(mdev));
4334
4335 current->policy = SCHED_RR; /* Make this a realtime task! */
4336 current->rt_priority = 2; /* more important than all other tasks */
4337
4338 while (get_t_state(thi) == Running) {
4339 drbd_thread_current_set_cpu(mdev);
4340 if (test_and_clear_bit(SEND_PING, &mdev->flags)) {
4341 ERR_IF(!drbd_send_ping(mdev)) goto reconnect;
4342 mdev->meta.socket->sk->sk_rcvtimeo =
4343 mdev->net_conf->ping_timeo*HZ/10;
4344 }
4345
4346 /* conditionally cork;
4347 * it may hurt latency if we cork without much to send */
4348 if (!mdev->net_conf->no_cork &&
4349 3 < atomic_read(&mdev->unacked_cnt))
4350 drbd_tcp_cork(mdev->meta.socket);
4351 while (1) {
4352 clear_bit(SIGNAL_ASENDER, &mdev->flags);
4353 flush_signals(current);
4354 if (!drbd_process_done_ee(mdev)) {
4355 dev_err(DEV, "process_done_ee() = NOT_OK\n");
4356 goto reconnect;
4357 }
4358 /* to avoid race with newly queued ACKs */
4359 set_bit(SIGNAL_ASENDER, &mdev->flags);
4360 spin_lock_irq(&mdev->req_lock);
4361 empty = list_empty(&mdev->done_ee);
4362 spin_unlock_irq(&mdev->req_lock);
4363 /* new ack may have been queued right here,
4364 * but then there is also a signal pending,
4365 * and we start over... */
4366 if (empty)
4367 break;
4368 }
4369 /* but unconditionally uncork unless disabled */
4370 if (!mdev->net_conf->no_cork)
4371 drbd_tcp_uncork(mdev->meta.socket);
4372
4373 /* short circuit, recv_msg would return EINTR anyways. */
4374 if (signal_pending(current))
4375 continue;
4376
4377 rv = drbd_recv_short(mdev, mdev->meta.socket,
4378 buf, expect-received, 0);
4379 clear_bit(SIGNAL_ASENDER, &mdev->flags);
4380
4381 flush_signals(current);
4382
4383 /* Note:
4384 * -EINTR (on meta) we got a signal
4385 * -EAGAIN (on meta) rcvtimeo expired
4386 * -ECONNRESET other side closed the connection
4387 * -ERESTARTSYS (on data) we got a signal
4388 * rv < 0 other than above: unexpected error!
4389 * rv == expected: full header or command
4390 * rv < expected: "woken" by signal during receive
4391 * rv == 0 : "connection shut down by peer"
4392 */
4393 if (likely(rv > 0)) {
4394 received += rv;
4395 buf += rv;
4396 } else if (rv == 0) {
4397 dev_err(DEV, "meta connection shut down by peer.\n");
4398 goto reconnect;
4399 } else if (rv == -EAGAIN) {
4400 if (mdev->meta.socket->sk->sk_rcvtimeo ==
4401 mdev->net_conf->ping_timeo*HZ/10) {
4402 dev_err(DEV, "PingAck did not arrive in time.\n");
4403 goto reconnect;
4404 }
4405 set_bit(SEND_PING, &mdev->flags);
4406 continue;
4407 } else if (rv == -EINTR) {
4408 continue;
4409 } else {
4410 dev_err(DEV, "sock_recvmsg returned %d\n", rv);
4411 goto reconnect;
4412 }
4413
4414 if (received == expect && cmd == NULL) {
4415 if (unlikely(h->magic != BE_DRBD_MAGIC)) {
4416 dev_err(DEV, "magic?? on meta m: 0x%lx c: %d l: %d\n",
4417 (long)be32_to_cpu(h->magic),
4418 h->command, h->length);
4419 goto reconnect;
4420 }
4421 cmd = get_asender_cmd(be16_to_cpu(h->command));
4422 len = be16_to_cpu(h->length);
4423 if (unlikely(cmd == NULL)) {
4424 dev_err(DEV, "unknown command?? on meta m: 0x%lx c: %d l: %d\n",
4425 (long)be32_to_cpu(h->magic),
4426 h->command, h->length);
4427 goto disconnect;
4428 }
4429 expect = cmd->pkt_size;
6a0afdf5 4430 ERR_IF(len != expect-sizeof(struct p_header))
b411b363 4431 goto reconnect;
b411b363
PR		 4432 }
4433 if (received == expect) {
4434 D_ASSERT(cmd != NULL);
b411b363
PR		 4435 if (!cmd->process(mdev, h))
4436 goto reconnect;
4437
4438 buf = h;
4439 received = 0;
4440 expect = sizeof(struct p_header);
4441 cmd = NULL;
4442 }
4443 }
4444
4445 if (0) {
4446reconnect:
4447 drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE));
4448 }
4449 if (0) {
4450disconnect:
4451 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
4452 }
4453 clear_bit(SIGNAL_ASENDER, &mdev->flags);
4454
4455 D_ASSERT(mdev->state.conn < C_CONNECTED);
4456 dev_info(DEV, "asender terminated\n");
4457
4458 return 0;
4459}
Clone of davem's net-next-2.6 tree