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