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 | ||
b411b363 PR |
31 | #include <linux/drbd.h> |
32 | #include <linux/fs.h> | |
33 | #include <linux/file.h> | |
34 | #include <linux/in.h> | |
35 | #include <linux/mm.h> | |
36 | #include <linux/memcontrol.h> | |
37 | #include <linux/mm_inline.h> | |
38 | #include <linux/slab.h> | |
39 | #include <linux/smp_lock.h> | |
40 | #include <linux/pkt_sched.h> | |
41 | #define __KERNEL_SYSCALLS__ | |
42 | #include <linux/unistd.h> | |
43 | #include <linux/vmalloc.h> | |
44 | #include <linux/random.h> | |
45 | #include <linux/mm.h> | |
46 | #include <linux/string.h> | |
47 | #include <linux/scatterlist.h> | |
48 | #include "drbd_int.h" | |
b411b363 PR |
49 | #include "drbd_req.h" |
50 | ||
51 | #include "drbd_vli.h" | |
52 | ||
53 | struct flush_work { | |
54 | struct drbd_work w; | |
55 | struct drbd_epoch *epoch; | |
56 | }; | |
57 | ||
58 | enum finish_epoch { | |
59 | FE_STILL_LIVE, | |
60 | FE_DESTROYED, | |
61 | FE_RECYCLED, | |
62 | }; | |
63 | ||
64 | static int drbd_do_handshake(struct drbd_conf *mdev); | |
65 | static int drbd_do_auth(struct drbd_conf *mdev); | |
66 | ||
67 | static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *, struct drbd_epoch *, enum epoch_event); | |
68 | static int e_end_block(struct drbd_conf *, struct drbd_work *, int); | |
69 | ||
70 | static struct drbd_epoch *previous_epoch(struct drbd_conf *mdev, struct drbd_epoch *epoch) | |
71 | { | |
72 | struct drbd_epoch *prev; | |
73 | spin_lock(&mdev->epoch_lock); | |
74 | prev = list_entry(epoch->list.prev, struct drbd_epoch, list); | |
75 | if (prev == epoch || prev == mdev->current_epoch) | |
76 | prev = NULL; | |
77 | spin_unlock(&mdev->epoch_lock); | |
78 | return prev; | |
79 | } | |
80 | ||
81 | #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) | |
82 | ||
83 | static struct page *drbd_pp_first_page_or_try_alloc(struct drbd_conf *mdev) | |
84 | { | |
85 | struct page *page = NULL; | |
86 | ||
87 | /* Yes, testing drbd_pp_vacant outside the lock is racy. | |
88 | * So what. It saves a spin_lock. */ | |
89 | if (drbd_pp_vacant > 0) { | |
90 | spin_lock(&drbd_pp_lock); | |
91 | page = drbd_pp_pool; | |
92 | if (page) { | |
93 | drbd_pp_pool = (struct page *)page_private(page); | |
94 | set_page_private(page, 0); /* just to be polite */ | |
95 | drbd_pp_vacant--; | |
96 | } | |
97 | spin_unlock(&drbd_pp_lock); | |
98 | } | |
99 | /* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD | |
100 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
101 | * which in turn might block on the other node at this very place. */ | |
102 | if (!page) | |
103 | page = alloc_page(GFP_TRY); | |
104 | if (page) | |
105 | atomic_inc(&mdev->pp_in_use); | |
106 | return page; | |
107 | } | |
108 | ||
109 | /* kick lower level device, if we have more than (arbitrary number) | |
110 | * reference counts on it, which typically are locally submitted io | |
111 | * requests. don't use unacked_cnt, so we speed up proto A and B, too. */ | |
112 | static void maybe_kick_lo(struct drbd_conf *mdev) | |
113 | { | |
114 | if (atomic_read(&mdev->local_cnt) >= mdev->net_conf->unplug_watermark) | |
115 | drbd_kick_lo(mdev); | |
116 | } | |
117 | ||
118 | static void reclaim_net_ee(struct drbd_conf *mdev, struct list_head *to_be_freed) | |
119 | { | |
120 | struct drbd_epoch_entry *e; | |
121 | struct list_head *le, *tle; | |
122 | ||
123 | /* The EEs are always appended to the end of the list. Since | |
124 | they are sent in order over the wire, they have to finish | |
125 | in order. As soon as we see the first not finished we can | |
126 | stop to examine the list... */ | |
127 | ||
128 | list_for_each_safe(le, tle, &mdev->net_ee) { | |
129 | e = list_entry(le, struct drbd_epoch_entry, w.list); | |
130 | if (drbd_bio_has_active_page(e->private_bio)) | |
131 | break; | |
132 | list_move(le, to_be_freed); | |
133 | } | |
134 | } | |
135 | ||
136 | static void drbd_kick_lo_and_reclaim_net(struct drbd_conf *mdev) | |
137 | { | |
138 | LIST_HEAD(reclaimed); | |
139 | struct drbd_epoch_entry *e, *t; | |
140 | ||
141 | maybe_kick_lo(mdev); | |
142 | spin_lock_irq(&mdev->req_lock); | |
143 | reclaim_net_ee(mdev, &reclaimed); | |
144 | spin_unlock_irq(&mdev->req_lock); | |
145 | ||
146 | list_for_each_entry_safe(e, t, &reclaimed, w.list) | |
147 | drbd_free_ee(mdev, e); | |
148 | } | |
149 | ||
150 | /** | |
151 | * drbd_pp_alloc() - Returns a page, fails only if a signal comes in | |
152 | * @mdev: DRBD device. | |
153 | * @retry: whether or not to retry allocation forever (or until signalled) | |
154 | * | |
155 | * Tries to allocate a page, first from our own page pool, then from the | |
156 | * kernel, unless this allocation would exceed the max_buffers setting. | |
157 | * If @retry is non-zero, retry until DRBD frees a page somewhere else. | |
158 | */ | |
159 | static struct page *drbd_pp_alloc(struct drbd_conf *mdev, int retry) | |
160 | { | |
161 | struct page *page = NULL; | |
162 | DEFINE_WAIT(wait); | |
163 | ||
164 | if (atomic_read(&mdev->pp_in_use) < mdev->net_conf->max_buffers) { | |
165 | page = drbd_pp_first_page_or_try_alloc(mdev); | |
166 | if (page) | |
167 | return page; | |
168 | } | |
169 | ||
170 | for (;;) { | |
171 | prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE); | |
172 | ||
173 | drbd_kick_lo_and_reclaim_net(mdev); | |
174 | ||
175 | if (atomic_read(&mdev->pp_in_use) < mdev->net_conf->max_buffers) { | |
176 | page = drbd_pp_first_page_or_try_alloc(mdev); | |
177 | if (page) | |
178 | break; | |
179 | } | |
180 | ||
181 | if (!retry) | |
182 | break; | |
183 | ||
184 | if (signal_pending(current)) { | |
185 | dev_warn(DEV, "drbd_pp_alloc interrupted!\n"); | |
186 | break; | |
187 | } | |
188 | ||
189 | schedule(); | |
190 | } | |
191 | finish_wait(&drbd_pp_wait, &wait); | |
192 | ||
193 | return page; | |
194 | } | |
195 | ||
196 | /* Must not be used from irq, as that may deadlock: see drbd_pp_alloc. | |
197 | * Is also used from inside an other spin_lock_irq(&mdev->req_lock) */ | |
198 | static void drbd_pp_free(struct drbd_conf *mdev, struct page *page) | |
199 | { | |
200 | int free_it; | |
201 | ||
202 | spin_lock(&drbd_pp_lock); | |
203 | if (drbd_pp_vacant > (DRBD_MAX_SEGMENT_SIZE/PAGE_SIZE)*minor_count) { | |
204 | free_it = 1; | |
205 | } else { | |
206 | set_page_private(page, (unsigned long)drbd_pp_pool); | |
207 | drbd_pp_pool = page; | |
208 | drbd_pp_vacant++; | |
209 | free_it = 0; | |
210 | } | |
211 | spin_unlock(&drbd_pp_lock); | |
212 | ||
213 | atomic_dec(&mdev->pp_in_use); | |
214 | ||
215 | if (free_it) | |
216 | __free_page(page); | |
217 | ||
218 | wake_up(&drbd_pp_wait); | |
219 | } | |
220 | ||
221 | static void drbd_pp_free_bio_pages(struct drbd_conf *mdev, struct bio *bio) | |
222 | { | |
223 | struct page *p_to_be_freed = NULL; | |
224 | struct page *page; | |
225 | struct bio_vec *bvec; | |
226 | int i; | |
227 | ||
228 | spin_lock(&drbd_pp_lock); | |
229 | __bio_for_each_segment(bvec, bio, i, 0) { | |
230 | if (drbd_pp_vacant > (DRBD_MAX_SEGMENT_SIZE/PAGE_SIZE)*minor_count) { | |
231 | set_page_private(bvec->bv_page, (unsigned long)p_to_be_freed); | |
232 | p_to_be_freed = bvec->bv_page; | |
233 | } else { | |
234 | set_page_private(bvec->bv_page, (unsigned long)drbd_pp_pool); | |
235 | drbd_pp_pool = bvec->bv_page; | |
236 | drbd_pp_vacant++; | |
237 | } | |
238 | } | |
239 | spin_unlock(&drbd_pp_lock); | |
240 | atomic_sub(bio->bi_vcnt, &mdev->pp_in_use); | |
241 | ||
242 | while (p_to_be_freed) { | |
243 | page = p_to_be_freed; | |
244 | p_to_be_freed = (struct page *)page_private(page); | |
245 | set_page_private(page, 0); /* just to be polite */ | |
246 | put_page(page); | |
247 | } | |
248 | ||
249 | wake_up(&drbd_pp_wait); | |
250 | } | |
251 | ||
252 | /* | |
253 | You need to hold the req_lock: | |
254 | _drbd_wait_ee_list_empty() | |
255 | ||
256 | You must not have the req_lock: | |
257 | drbd_free_ee() | |
258 | drbd_alloc_ee() | |
259 | drbd_init_ee() | |
260 | drbd_release_ee() | |
261 | drbd_ee_fix_bhs() | |
262 | drbd_process_done_ee() | |
263 | drbd_clear_done_ee() | |
264 | drbd_wait_ee_list_empty() | |
265 | */ | |
266 | ||
267 | struct drbd_epoch_entry *drbd_alloc_ee(struct drbd_conf *mdev, | |
268 | u64 id, | |
269 | sector_t sector, | |
270 | unsigned int data_size, | |
271 | gfp_t gfp_mask) __must_hold(local) | |
272 | { | |
273 | struct request_queue *q; | |
274 | struct drbd_epoch_entry *e; | |
275 | struct page *page; | |
276 | struct bio *bio; | |
277 | unsigned int ds; | |
278 | ||
279 | if (FAULT_ACTIVE(mdev, DRBD_FAULT_AL_EE)) | |
280 | return NULL; | |
281 | ||
282 | e = mempool_alloc(drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM); | |
283 | if (!e) { | |
284 | if (!(gfp_mask & __GFP_NOWARN)) | |
285 | dev_err(DEV, "alloc_ee: Allocation of an EE failed\n"); | |
286 | return NULL; | |
287 | } | |
288 | ||
289 | bio = bio_alloc(gfp_mask & ~__GFP_HIGHMEM, div_ceil(data_size, PAGE_SIZE)); | |
290 | if (!bio) { | |
291 | if (!(gfp_mask & __GFP_NOWARN)) | |
292 | dev_err(DEV, "alloc_ee: Allocation of a bio failed\n"); | |
293 | goto fail1; | |
294 | } | |
295 | ||
296 | bio->bi_bdev = mdev->ldev->backing_bdev; | |
297 | bio->bi_sector = sector; | |
298 | ||
299 | ds = data_size; | |
300 | while (ds) { | |
301 | page = drbd_pp_alloc(mdev, (gfp_mask & __GFP_WAIT)); | |
302 | if (!page) { | |
303 | if (!(gfp_mask & __GFP_NOWARN)) | |
304 | dev_err(DEV, "alloc_ee: Allocation of a page failed\n"); | |
305 | goto fail2; | |
306 | } | |
307 | if (!bio_add_page(bio, page, min_t(int, ds, PAGE_SIZE), 0)) { | |
308 | drbd_pp_free(mdev, page); | |
309 | dev_err(DEV, "alloc_ee: bio_add_page(s=%llu," | |
310 | "data_size=%u,ds=%u) failed\n", | |
311 | (unsigned long long)sector, data_size, ds); | |
312 | ||
313 | q = bdev_get_queue(bio->bi_bdev); | |
314 | if (q->merge_bvec_fn) { | |
315 | struct bvec_merge_data bvm = { | |
316 | .bi_bdev = bio->bi_bdev, | |
317 | .bi_sector = bio->bi_sector, | |
318 | .bi_size = bio->bi_size, | |
319 | .bi_rw = bio->bi_rw, | |
320 | }; | |
321 | int l = q->merge_bvec_fn(q, &bvm, | |
322 | &bio->bi_io_vec[bio->bi_vcnt]); | |
323 | dev_err(DEV, "merge_bvec_fn() = %d\n", l); | |
324 | } | |
325 | ||
326 | /* dump more of the bio. */ | |
327 | dev_err(DEV, "bio->bi_max_vecs = %d\n", bio->bi_max_vecs); | |
328 | dev_err(DEV, "bio->bi_vcnt = %d\n", bio->bi_vcnt); | |
329 | dev_err(DEV, "bio->bi_size = %d\n", bio->bi_size); | |
330 | dev_err(DEV, "bio->bi_phys_segments = %d\n", bio->bi_phys_segments); | |
331 | ||
332 | goto fail2; | |
333 | break; | |
334 | } | |
335 | ds -= min_t(int, ds, PAGE_SIZE); | |
336 | } | |
337 | ||
338 | D_ASSERT(data_size == bio->bi_size); | |
339 | ||
340 | bio->bi_private = e; | |
341 | e->mdev = mdev; | |
342 | e->sector = sector; | |
343 | e->size = bio->bi_size; | |
344 | ||
345 | e->private_bio = bio; | |
346 | e->block_id = id; | |
347 | INIT_HLIST_NODE(&e->colision); | |
348 | e->epoch = NULL; | |
349 | e->flags = 0; | |
350 | ||
b411b363 PR |
351 | return e; |
352 | ||
353 | fail2: | |
354 | drbd_pp_free_bio_pages(mdev, bio); | |
355 | bio_put(bio); | |
356 | fail1: | |
357 | mempool_free(e, drbd_ee_mempool); | |
358 | ||
359 | return NULL; | |
360 | } | |
361 | ||
362 | void drbd_free_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e) | |
363 | { | |
364 | struct bio *bio = e->private_bio; | |
b411b363 PR |
365 | drbd_pp_free_bio_pages(mdev, bio); |
366 | bio_put(bio); | |
367 | D_ASSERT(hlist_unhashed(&e->colision)); | |
368 | mempool_free(e, drbd_ee_mempool); | |
369 | } | |
370 | ||
371 | int drbd_release_ee(struct drbd_conf *mdev, struct list_head *list) | |
372 | { | |
373 | LIST_HEAD(work_list); | |
374 | struct drbd_epoch_entry *e, *t; | |
375 | int count = 0; | |
376 | ||
377 | spin_lock_irq(&mdev->req_lock); | |
378 | list_splice_init(list, &work_list); | |
379 | spin_unlock_irq(&mdev->req_lock); | |
380 | ||
381 | list_for_each_entry_safe(e, t, &work_list, w.list) { | |
382 | drbd_free_ee(mdev, e); | |
383 | count++; | |
384 | } | |
385 | return count; | |
386 | } | |
387 | ||
388 | ||
389 | /* | |
390 | * This function is called from _asender only_ | |
391 | * but see also comments in _req_mod(,barrier_acked) | |
392 | * and receive_Barrier. | |
393 | * | |
394 | * Move entries from net_ee to done_ee, if ready. | |
395 | * Grab done_ee, call all callbacks, free the entries. | |
396 | * The callbacks typically send out ACKs. | |
397 | */ | |
398 | static int drbd_process_done_ee(struct drbd_conf *mdev) | |
399 | { | |
400 | LIST_HEAD(work_list); | |
401 | LIST_HEAD(reclaimed); | |
402 | struct drbd_epoch_entry *e, *t; | |
403 | int ok = (mdev->state.conn >= C_WF_REPORT_PARAMS); | |
404 | ||
405 | spin_lock_irq(&mdev->req_lock); | |
406 | reclaim_net_ee(mdev, &reclaimed); | |
407 | list_splice_init(&mdev->done_ee, &work_list); | |
408 | spin_unlock_irq(&mdev->req_lock); | |
409 | ||
410 | list_for_each_entry_safe(e, t, &reclaimed, w.list) | |
411 | drbd_free_ee(mdev, e); | |
412 | ||
413 | /* possible callbacks here: | |
414 | * e_end_block, and e_end_resync_block, e_send_discard_ack. | |
415 | * all ignore the last argument. | |
416 | */ | |
417 | list_for_each_entry_safe(e, t, &work_list, w.list) { | |
b411b363 PR |
418 | /* list_del not necessary, next/prev members not touched */ |
419 | ok = e->w.cb(mdev, &e->w, !ok) && ok; | |
420 | drbd_free_ee(mdev, e); | |
421 | } | |
422 | wake_up(&mdev->ee_wait); | |
423 | ||
424 | return ok; | |
425 | } | |
426 | ||
427 | void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head) | |
428 | { | |
429 | DEFINE_WAIT(wait); | |
430 | ||
431 | /* avoids spin_lock/unlock | |
432 | * and calling prepare_to_wait in the fast path */ | |
433 | while (!list_empty(head)) { | |
434 | prepare_to_wait(&mdev->ee_wait, &wait, TASK_UNINTERRUPTIBLE); | |
435 | spin_unlock_irq(&mdev->req_lock); | |
436 | drbd_kick_lo(mdev); | |
437 | schedule(); | |
438 | finish_wait(&mdev->ee_wait, &wait); | |
439 | spin_lock_irq(&mdev->req_lock); | |
440 | } | |
441 | } | |
442 | ||
443 | void drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head) | |
444 | { | |
445 | spin_lock_irq(&mdev->req_lock); | |
446 | _drbd_wait_ee_list_empty(mdev, head); | |
447 | spin_unlock_irq(&mdev->req_lock); | |
448 | } | |
449 | ||
450 | /* see also kernel_accept; which is only present since 2.6.18. | |
451 | * also we want to log which part of it failed, exactly */ | |
452 | static int drbd_accept(struct drbd_conf *mdev, const char **what, | |
453 | struct socket *sock, struct socket **newsock) | |
454 | { | |
455 | struct sock *sk = sock->sk; | |
456 | int err = 0; | |
457 | ||
458 | *what = "listen"; | |
459 | err = sock->ops->listen(sock, 5); | |
460 | if (err < 0) | |
461 | goto out; | |
462 | ||
463 | *what = "sock_create_lite"; | |
464 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, | |
465 | newsock); | |
466 | if (err < 0) | |
467 | goto out; | |
468 | ||
469 | *what = "accept"; | |
470 | err = sock->ops->accept(sock, *newsock, 0); | |
471 | if (err < 0) { | |
472 | sock_release(*newsock); | |
473 | *newsock = NULL; | |
474 | goto out; | |
475 | } | |
476 | (*newsock)->ops = sock->ops; | |
477 | ||
478 | out: | |
479 | return err; | |
480 | } | |
481 | ||
482 | static int drbd_recv_short(struct drbd_conf *mdev, struct socket *sock, | |
483 | void *buf, size_t size, int flags) | |
484 | { | |
485 | mm_segment_t oldfs; | |
486 | struct kvec iov = { | |
487 | .iov_base = buf, | |
488 | .iov_len = size, | |
489 | }; | |
490 | struct msghdr msg = { | |
491 | .msg_iovlen = 1, | |
492 | .msg_iov = (struct iovec *)&iov, | |
493 | .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) | |
494 | }; | |
495 | int rv; | |
496 | ||
497 | oldfs = get_fs(); | |
498 | set_fs(KERNEL_DS); | |
499 | rv = sock_recvmsg(sock, &msg, size, msg.msg_flags); | |
500 | set_fs(oldfs); | |
501 | ||
502 | return rv; | |
503 | } | |
504 | ||
505 | static int drbd_recv(struct drbd_conf *mdev, void *buf, size_t size) | |
506 | { | |
507 | mm_segment_t oldfs; | |
508 | struct kvec iov = { | |
509 | .iov_base = buf, | |
510 | .iov_len = size, | |
511 | }; | |
512 | struct msghdr msg = { | |
513 | .msg_iovlen = 1, | |
514 | .msg_iov = (struct iovec *)&iov, | |
515 | .msg_flags = MSG_WAITALL | MSG_NOSIGNAL | |
516 | }; | |
517 | int rv; | |
518 | ||
519 | oldfs = get_fs(); | |
520 | set_fs(KERNEL_DS); | |
521 | ||
522 | for (;;) { | |
523 | rv = sock_recvmsg(mdev->data.socket, &msg, size, msg.msg_flags); | |
524 | if (rv == size) | |
525 | break; | |
526 | ||
527 | /* Note: | |
528 | * ECONNRESET other side closed the connection | |
529 | * ERESTARTSYS (on sock) we got a signal | |
530 | */ | |
531 | ||
532 | if (rv < 0) { | |
533 | if (rv == -ECONNRESET) | |
534 | dev_info(DEV, "sock was reset by peer\n"); | |
535 | else if (rv != -ERESTARTSYS) | |
536 | dev_err(DEV, "sock_recvmsg returned %d\n", rv); | |
537 | break; | |
538 | } else if (rv == 0) { | |
539 | dev_info(DEV, "sock was shut down by peer\n"); | |
540 | break; | |
541 | } else { | |
542 | /* signal came in, or peer/link went down, | |
543 | * after we read a partial message | |
544 | */ | |
545 | /* D_ASSERT(signal_pending(current)); */ | |
546 | break; | |
547 | } | |
548 | }; | |
549 | ||
550 | set_fs(oldfs); | |
551 | ||
552 | if (rv != size) | |
553 | drbd_force_state(mdev, NS(conn, C_BROKEN_PIPE)); | |
554 | ||
555 | return rv; | |
556 | } | |
557 | ||
558 | static struct socket *drbd_try_connect(struct drbd_conf *mdev) | |
559 | { | |
560 | const char *what; | |
561 | struct socket *sock; | |
562 | struct sockaddr_in6 src_in6; | |
563 | int err; | |
564 | int disconnect_on_error = 1; | |
565 | ||
566 | if (!get_net_conf(mdev)) | |
567 | return NULL; | |
568 | ||
569 | what = "sock_create_kern"; | |
570 | err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family, | |
571 | SOCK_STREAM, IPPROTO_TCP, &sock); | |
572 | if (err < 0) { | |
573 | sock = NULL; | |
574 | goto out; | |
575 | } | |
576 | ||
577 | sock->sk->sk_rcvtimeo = | |
578 | sock->sk->sk_sndtimeo = mdev->net_conf->try_connect_int*HZ; | |
579 | ||
580 | /* explicitly bind to the configured IP as source IP | |
581 | * for the outgoing connections. | |
582 | * This is needed for multihomed hosts and to be | |
583 | * able to use lo: interfaces for drbd. | |
584 | * Make sure to use 0 as port number, so linux selects | |
585 | * a free one dynamically. | |
586 | */ | |
587 | memcpy(&src_in6, mdev->net_conf->my_addr, | |
588 | min_t(int, mdev->net_conf->my_addr_len, sizeof(src_in6))); | |
589 | if (((struct sockaddr *)mdev->net_conf->my_addr)->sa_family == AF_INET6) | |
590 | src_in6.sin6_port = 0; | |
591 | else | |
592 | ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ | |
593 | ||
594 | what = "bind before connect"; | |
595 | err = sock->ops->bind(sock, | |
596 | (struct sockaddr *) &src_in6, | |
597 | mdev->net_conf->my_addr_len); | |
598 | if (err < 0) | |
599 | goto out; | |
600 | ||
601 | /* connect may fail, peer not yet available. | |
602 | * stay C_WF_CONNECTION, don't go Disconnecting! */ | |
603 | disconnect_on_error = 0; | |
604 | what = "connect"; | |
605 | err = sock->ops->connect(sock, | |
606 | (struct sockaddr *)mdev->net_conf->peer_addr, | |
607 | mdev->net_conf->peer_addr_len, 0); | |
608 | ||
609 | out: | |
610 | if (err < 0) { | |
611 | if (sock) { | |
612 | sock_release(sock); | |
613 | sock = NULL; | |
614 | } | |
615 | switch (-err) { | |
616 | /* timeout, busy, signal pending */ | |
617 | case ETIMEDOUT: case EAGAIN: case EINPROGRESS: | |
618 | case EINTR: case ERESTARTSYS: | |
619 | /* peer not (yet) available, network problem */ | |
620 | case ECONNREFUSED: case ENETUNREACH: | |
621 | case EHOSTDOWN: case EHOSTUNREACH: | |
622 | disconnect_on_error = 0; | |
623 | break; | |
624 | default: | |
625 | dev_err(DEV, "%s failed, err = %d\n", what, err); | |
626 | } | |
627 | if (disconnect_on_error) | |
628 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
629 | } | |
630 | put_net_conf(mdev); | |
631 | return sock; | |
632 | } | |
633 | ||
634 | static struct socket *drbd_wait_for_connect(struct drbd_conf *mdev) | |
635 | { | |
636 | int timeo, err; | |
637 | struct socket *s_estab = NULL, *s_listen; | |
638 | const char *what; | |
639 | ||
640 | if (!get_net_conf(mdev)) | |
641 | return NULL; | |
642 | ||
643 | what = "sock_create_kern"; | |
644 | err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family, | |
645 | SOCK_STREAM, IPPROTO_TCP, &s_listen); | |
646 | if (err) { | |
647 | s_listen = NULL; | |
648 | goto out; | |
649 | } | |
650 | ||
651 | timeo = mdev->net_conf->try_connect_int * HZ; | |
652 | timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */ | |
653 | ||
654 | s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */ | |
655 | s_listen->sk->sk_rcvtimeo = timeo; | |
656 | s_listen->sk->sk_sndtimeo = timeo; | |
657 | ||
658 | what = "bind before listen"; | |
659 | err = s_listen->ops->bind(s_listen, | |
660 | (struct sockaddr *) mdev->net_conf->my_addr, | |
661 | mdev->net_conf->my_addr_len); | |
662 | if (err < 0) | |
663 | goto out; | |
664 | ||
665 | err = drbd_accept(mdev, &what, s_listen, &s_estab); | |
666 | ||
667 | out: | |
668 | if (s_listen) | |
669 | sock_release(s_listen); | |
670 | if (err < 0) { | |
671 | if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { | |
672 | dev_err(DEV, "%s failed, err = %d\n", what, err); | |
673 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
674 | } | |
675 | } | |
676 | put_net_conf(mdev); | |
677 | ||
678 | return s_estab; | |
679 | } | |
680 | ||
681 | static int drbd_send_fp(struct drbd_conf *mdev, | |
682 | struct socket *sock, enum drbd_packets cmd) | |
683 | { | |
684 | struct p_header *h = (struct p_header *) &mdev->data.sbuf.header; | |
685 | ||
686 | return _drbd_send_cmd(mdev, sock, cmd, h, sizeof(*h), 0); | |
687 | } | |
688 | ||
689 | static enum drbd_packets drbd_recv_fp(struct drbd_conf *mdev, struct socket *sock) | |
690 | { | |
691 | struct p_header *h = (struct p_header *) &mdev->data.sbuf.header; | |
692 | int rr; | |
693 | ||
694 | rr = drbd_recv_short(mdev, sock, h, sizeof(*h), 0); | |
695 | ||
696 | if (rr == sizeof(*h) && h->magic == BE_DRBD_MAGIC) | |
697 | return be16_to_cpu(h->command); | |
698 | ||
699 | return 0xffff; | |
700 | } | |
701 | ||
702 | /** | |
703 | * drbd_socket_okay() - Free the socket if its connection is not okay | |
704 | * @mdev: DRBD device. | |
705 | * @sock: pointer to the pointer to the socket. | |
706 | */ | |
707 | static int drbd_socket_okay(struct drbd_conf *mdev, struct socket **sock) | |
708 | { | |
709 | int rr; | |
710 | char tb[4]; | |
711 | ||
712 | if (!*sock) | |
713 | return FALSE; | |
714 | ||
715 | rr = drbd_recv_short(mdev, *sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); | |
716 | ||
717 | if (rr > 0 || rr == -EAGAIN) { | |
718 | return TRUE; | |
719 | } else { | |
720 | sock_release(*sock); | |
721 | *sock = NULL; | |
722 | return FALSE; | |
723 | } | |
724 | } | |
725 | ||
726 | /* | |
727 | * return values: | |
728 | * 1 yes, we have a valid connection | |
729 | * 0 oops, did not work out, please try again | |
730 | * -1 peer talks different language, | |
731 | * no point in trying again, please go standalone. | |
732 | * -2 We do not have a network config... | |
733 | */ | |
734 | static int drbd_connect(struct drbd_conf *mdev) | |
735 | { | |
736 | struct socket *s, *sock, *msock; | |
737 | int try, h, ok; | |
738 | ||
739 | D_ASSERT(!mdev->data.socket); | |
740 | ||
741 | if (test_and_clear_bit(CREATE_BARRIER, &mdev->flags)) | |
742 | dev_err(DEV, "CREATE_BARRIER flag was set in drbd_connect - now cleared!\n"); | |
743 | ||
744 | if (drbd_request_state(mdev, NS(conn, C_WF_CONNECTION)) < SS_SUCCESS) | |
745 | return -2; | |
746 | ||
747 | clear_bit(DISCARD_CONCURRENT, &mdev->flags); | |
748 | ||
749 | sock = NULL; | |
750 | msock = NULL; | |
751 | ||
752 | do { | |
753 | for (try = 0;;) { | |
754 | /* 3 tries, this should take less than a second! */ | |
755 | s = drbd_try_connect(mdev); | |
756 | if (s || ++try >= 3) | |
757 | break; | |
758 | /* give the other side time to call bind() & listen() */ | |
759 | __set_current_state(TASK_INTERRUPTIBLE); | |
760 | schedule_timeout(HZ / 10); | |
761 | } | |
762 | ||
763 | if (s) { | |
764 | if (!sock) { | |
765 | drbd_send_fp(mdev, s, P_HAND_SHAKE_S); | |
766 | sock = s; | |
767 | s = NULL; | |
768 | } else if (!msock) { | |
769 | drbd_send_fp(mdev, s, P_HAND_SHAKE_M); | |
770 | msock = s; | |
771 | s = NULL; | |
772 | } else { | |
773 | dev_err(DEV, "Logic error in drbd_connect()\n"); | |
774 | goto out_release_sockets; | |
775 | } | |
776 | } | |
777 | ||
778 | if (sock && msock) { | |
779 | __set_current_state(TASK_INTERRUPTIBLE); | |
780 | schedule_timeout(HZ / 10); | |
781 | ok = drbd_socket_okay(mdev, &sock); | |
782 | ok = drbd_socket_okay(mdev, &msock) && ok; | |
783 | if (ok) | |
784 | break; | |
785 | } | |
786 | ||
787 | retry: | |
788 | s = drbd_wait_for_connect(mdev); | |
789 | if (s) { | |
790 | try = drbd_recv_fp(mdev, s); | |
791 | drbd_socket_okay(mdev, &sock); | |
792 | drbd_socket_okay(mdev, &msock); | |
793 | switch (try) { | |
794 | case P_HAND_SHAKE_S: | |
795 | if (sock) { | |
796 | dev_warn(DEV, "initial packet S crossed\n"); | |
797 | sock_release(sock); | |
798 | } | |
799 | sock = s; | |
800 | break; | |
801 | case P_HAND_SHAKE_M: | |
802 | if (msock) { | |
803 | dev_warn(DEV, "initial packet M crossed\n"); | |
804 | sock_release(msock); | |
805 | } | |
806 | msock = s; | |
807 | set_bit(DISCARD_CONCURRENT, &mdev->flags); | |
808 | break; | |
809 | default: | |
810 | dev_warn(DEV, "Error receiving initial packet\n"); | |
811 | sock_release(s); | |
812 | if (random32() & 1) | |
813 | goto retry; | |
814 | } | |
815 | } | |
816 | ||
817 | if (mdev->state.conn <= C_DISCONNECTING) | |
818 | goto out_release_sockets; | |
819 | if (signal_pending(current)) { | |
820 | flush_signals(current); | |
821 | smp_rmb(); | |
822 | if (get_t_state(&mdev->receiver) == Exiting) | |
823 | goto out_release_sockets; | |
824 | } | |
825 | ||
826 | if (sock && msock) { | |
827 | ok = drbd_socket_okay(mdev, &sock); | |
828 | ok = drbd_socket_okay(mdev, &msock) && ok; | |
829 | if (ok) | |
830 | break; | |
831 | } | |
832 | } while (1); | |
833 | ||
834 | msock->sk->sk_reuse = 1; /* SO_REUSEADDR */ | |
835 | sock->sk->sk_reuse = 1; /* SO_REUSEADDR */ | |
836 | ||
837 | sock->sk->sk_allocation = GFP_NOIO; | |
838 | msock->sk->sk_allocation = GFP_NOIO; | |
839 | ||
840 | sock->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; | |
841 | msock->sk->sk_priority = TC_PRIO_INTERACTIVE; | |
842 | ||
843 | if (mdev->net_conf->sndbuf_size) { | |
844 | sock->sk->sk_sndbuf = mdev->net_conf->sndbuf_size; | |
845 | sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; | |
846 | } | |
847 | ||
848 | if (mdev->net_conf->rcvbuf_size) { | |
849 | sock->sk->sk_rcvbuf = mdev->net_conf->rcvbuf_size; | |
850 | sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; | |
851 | } | |
852 | ||
853 | /* NOT YET ... | |
854 | * sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; | |
855 | * sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
856 | * first set it to the P_HAND_SHAKE timeout, | |
857 | * which we set to 4x the configured ping_timeout. */ | |
858 | sock->sk->sk_sndtimeo = | |
859 | sock->sk->sk_rcvtimeo = mdev->net_conf->ping_timeo*4*HZ/10; | |
860 | ||
861 | msock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; | |
862 | msock->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ; | |
863 | ||
864 | /* we don't want delays. | |
865 | * we use TCP_CORK where apropriate, though */ | |
866 | drbd_tcp_nodelay(sock); | |
867 | drbd_tcp_nodelay(msock); | |
868 | ||
869 | mdev->data.socket = sock; | |
870 | mdev->meta.socket = msock; | |
871 | mdev->last_received = jiffies; | |
872 | ||
873 | D_ASSERT(mdev->asender.task == NULL); | |
874 | ||
875 | h = drbd_do_handshake(mdev); | |
876 | if (h <= 0) | |
877 | return h; | |
878 | ||
879 | if (mdev->cram_hmac_tfm) { | |
880 | /* drbd_request_state(mdev, NS(conn, WFAuth)); */ | |
b10d96cb JT |
881 | switch (drbd_do_auth(mdev)) { |
882 | case -1: | |
b411b363 PR |
883 | dev_err(DEV, "Authentication of peer failed\n"); |
884 | return -1; | |
b10d96cb JT |
885 | case 0: |
886 | dev_err(DEV, "Authentication of peer failed, trying again.\n"); | |
887 | return 0; | |
b411b363 PR |
888 | } |
889 | } | |
890 | ||
891 | if (drbd_request_state(mdev, NS(conn, C_WF_REPORT_PARAMS)) < SS_SUCCESS) | |
892 | return 0; | |
893 | ||
894 | sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; | |
895 | sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
896 | ||
897 | atomic_set(&mdev->packet_seq, 0); | |
898 | mdev->peer_seq = 0; | |
899 | ||
900 | drbd_thread_start(&mdev->asender); | |
901 | ||
7e2455c1 PR |
902 | if (!drbd_send_protocol(mdev)) |
903 | return -1; | |
b411b363 PR |
904 | drbd_send_sync_param(mdev, &mdev->sync_conf); |
905 | drbd_send_sizes(mdev, 0); | |
906 | drbd_send_uuids(mdev); | |
907 | drbd_send_state(mdev); | |
908 | clear_bit(USE_DEGR_WFC_T, &mdev->flags); | |
909 | clear_bit(RESIZE_PENDING, &mdev->flags); | |
910 | ||
911 | return 1; | |
912 | ||
913 | out_release_sockets: | |
914 | if (sock) | |
915 | sock_release(sock); | |
916 | if (msock) | |
917 | sock_release(msock); | |
918 | return -1; | |
919 | } | |
920 | ||
921 | static int drbd_recv_header(struct drbd_conf *mdev, struct p_header *h) | |
922 | { | |
923 | int r; | |
924 | ||
925 | r = drbd_recv(mdev, h, sizeof(*h)); | |
926 | ||
927 | if (unlikely(r != sizeof(*h))) { | |
928 | dev_err(DEV, "short read expecting header on sock: r=%d\n", r); | |
929 | return FALSE; | |
930 | }; | |
931 | h->command = be16_to_cpu(h->command); | |
932 | h->length = be16_to_cpu(h->length); | |
933 | if (unlikely(h->magic != BE_DRBD_MAGIC)) { | |
934 | dev_err(DEV, "magic?? on data m: 0x%lx c: %d l: %d\n", | |
935 | (long)be32_to_cpu(h->magic), | |
936 | h->command, h->length); | |
937 | return FALSE; | |
938 | } | |
939 | mdev->last_received = jiffies; | |
940 | ||
941 | return TRUE; | |
942 | } | |
943 | ||
944 | static enum finish_epoch drbd_flush_after_epoch(struct drbd_conf *mdev, struct drbd_epoch *epoch) | |
945 | { | |
946 | int rv; | |
947 | ||
948 | if (mdev->write_ordering >= WO_bdev_flush && get_ldev(mdev)) { | |
949 | rv = blkdev_issue_flush(mdev->ldev->backing_bdev, NULL); | |
950 | if (rv) { | |
951 | dev_err(DEV, "local disk flush failed with status %d\n", rv); | |
952 | /* would rather check on EOPNOTSUPP, but that is not reliable. | |
953 | * don't try again for ANY return value != 0 | |
954 | * if (rv == -EOPNOTSUPP) */ | |
955 | drbd_bump_write_ordering(mdev, WO_drain_io); | |
956 | } | |
957 | put_ldev(mdev); | |
958 | } | |
959 | ||
960 | return drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE); | |
961 | } | |
962 | ||
963 | static int w_flush(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
964 | { | |
965 | struct flush_work *fw = (struct flush_work *)w; | |
966 | struct drbd_epoch *epoch = fw->epoch; | |
967 | ||
968 | kfree(w); | |
969 | ||
970 | if (!test_and_set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags)) | |
971 | drbd_flush_after_epoch(mdev, epoch); | |
972 | ||
973 | drbd_may_finish_epoch(mdev, epoch, EV_PUT | | |
974 | (mdev->state.conn < C_CONNECTED ? EV_CLEANUP : 0)); | |
975 | ||
976 | return 1; | |
977 | } | |
978 | ||
979 | /** | |
980 | * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. | |
981 | * @mdev: DRBD device. | |
982 | * @epoch: Epoch object. | |
983 | * @ev: Epoch event. | |
984 | */ | |
985 | static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev, | |
986 | struct drbd_epoch *epoch, | |
987 | enum epoch_event ev) | |
988 | { | |
989 | int finish, epoch_size; | |
990 | struct drbd_epoch *next_epoch; | |
991 | int schedule_flush = 0; | |
992 | enum finish_epoch rv = FE_STILL_LIVE; | |
993 | ||
994 | spin_lock(&mdev->epoch_lock); | |
995 | do { | |
996 | next_epoch = NULL; | |
997 | finish = 0; | |
998 | ||
999 | epoch_size = atomic_read(&epoch->epoch_size); | |
1000 | ||
1001 | switch (ev & ~EV_CLEANUP) { | |
1002 | case EV_PUT: | |
1003 | atomic_dec(&epoch->active); | |
1004 | break; | |
1005 | case EV_GOT_BARRIER_NR: | |
1006 | set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); | |
1007 | ||
1008 | /* Special case: If we just switched from WO_bio_barrier to | |
1009 | WO_bdev_flush we should not finish the current epoch */ | |
1010 | if (test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags) && epoch_size == 1 && | |
1011 | mdev->write_ordering != WO_bio_barrier && | |
1012 | epoch == mdev->current_epoch) | |
1013 | clear_bit(DE_CONTAINS_A_BARRIER, &epoch->flags); | |
1014 | break; | |
1015 | case EV_BARRIER_DONE: | |
1016 | set_bit(DE_BARRIER_IN_NEXT_EPOCH_DONE, &epoch->flags); | |
1017 | break; | |
1018 | case EV_BECAME_LAST: | |
1019 | /* nothing to do*/ | |
1020 | break; | |
1021 | } | |
1022 | ||
b411b363 PR |
1023 | if (epoch_size != 0 && |
1024 | atomic_read(&epoch->active) == 0 && | |
1025 | test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags) && | |
1026 | epoch->list.prev == &mdev->current_epoch->list && | |
1027 | !test_bit(DE_IS_FINISHING, &epoch->flags)) { | |
1028 | /* Nearly all conditions are met to finish that epoch... */ | |
1029 | if (test_bit(DE_BARRIER_IN_NEXT_EPOCH_DONE, &epoch->flags) || | |
1030 | mdev->write_ordering == WO_none || | |
1031 | (epoch_size == 1 && test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags)) || | |
1032 | ev & EV_CLEANUP) { | |
1033 | finish = 1; | |
1034 | set_bit(DE_IS_FINISHING, &epoch->flags); | |
1035 | } else if (!test_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags) && | |
1036 | mdev->write_ordering == WO_bio_barrier) { | |
1037 | atomic_inc(&epoch->active); | |
1038 | schedule_flush = 1; | |
1039 | } | |
1040 | } | |
1041 | if (finish) { | |
1042 | if (!(ev & EV_CLEANUP)) { | |
1043 | spin_unlock(&mdev->epoch_lock); | |
1044 | drbd_send_b_ack(mdev, epoch->barrier_nr, epoch_size); | |
1045 | spin_lock(&mdev->epoch_lock); | |
1046 | } | |
1047 | dec_unacked(mdev); | |
1048 | ||
1049 | if (mdev->current_epoch != epoch) { | |
1050 | next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); | |
1051 | list_del(&epoch->list); | |
1052 | ev = EV_BECAME_LAST | (ev & EV_CLEANUP); | |
1053 | mdev->epochs--; | |
b411b363 PR |
1054 | kfree(epoch); |
1055 | ||
1056 | if (rv == FE_STILL_LIVE) | |
1057 | rv = FE_DESTROYED; | |
1058 | } else { | |
1059 | epoch->flags = 0; | |
1060 | atomic_set(&epoch->epoch_size, 0); | |
1061 | /* atomic_set(&epoch->active, 0); is alrady zero */ | |
1062 | if (rv == FE_STILL_LIVE) | |
1063 | rv = FE_RECYCLED; | |
1064 | } | |
1065 | } | |
1066 | ||
1067 | if (!next_epoch) | |
1068 | break; | |
1069 | ||
1070 | epoch = next_epoch; | |
1071 | } while (1); | |
1072 | ||
1073 | spin_unlock(&mdev->epoch_lock); | |
1074 | ||
1075 | if (schedule_flush) { | |
1076 | struct flush_work *fw; | |
1077 | fw = kmalloc(sizeof(*fw), GFP_ATOMIC); | |
1078 | if (fw) { | |
b411b363 PR |
1079 | fw->w.cb = w_flush; |
1080 | fw->epoch = epoch; | |
1081 | drbd_queue_work(&mdev->data.work, &fw->w); | |
1082 | } else { | |
1083 | dev_warn(DEV, "Could not kmalloc a flush_work obj\n"); | |
1084 | set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags); | |
1085 | /* That is not a recursion, only one level */ | |
1086 | drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE); | |
1087 | drbd_may_finish_epoch(mdev, epoch, EV_PUT); | |
1088 | } | |
1089 | } | |
1090 | ||
1091 | return rv; | |
1092 | } | |
1093 | ||
1094 | /** | |
1095 | * drbd_bump_write_ordering() - Fall back to an other write ordering method | |
1096 | * @mdev: DRBD device. | |
1097 | * @wo: Write ordering method to try. | |
1098 | */ | |
1099 | void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo) __must_hold(local) | |
1100 | { | |
1101 | enum write_ordering_e pwo; | |
1102 | static char *write_ordering_str[] = { | |
1103 | [WO_none] = "none", | |
1104 | [WO_drain_io] = "drain", | |
1105 | [WO_bdev_flush] = "flush", | |
1106 | [WO_bio_barrier] = "barrier", | |
1107 | }; | |
1108 | ||
1109 | pwo = mdev->write_ordering; | |
1110 | wo = min(pwo, wo); | |
1111 | if (wo == WO_bio_barrier && mdev->ldev->dc.no_disk_barrier) | |
1112 | wo = WO_bdev_flush; | |
1113 | if (wo == WO_bdev_flush && mdev->ldev->dc.no_disk_flush) | |
1114 | wo = WO_drain_io; | |
1115 | if (wo == WO_drain_io && mdev->ldev->dc.no_disk_drain) | |
1116 | wo = WO_none; | |
1117 | mdev->write_ordering = wo; | |
1118 | if (pwo != mdev->write_ordering || wo == WO_bio_barrier) | |
1119 | dev_info(DEV, "Method to ensure write ordering: %s\n", write_ordering_str[mdev->write_ordering]); | |
1120 | } | |
1121 | ||
1122 | /** | |
1123 | * w_e_reissue() - Worker callback; Resubmit a bio, without BIO_RW_BARRIER set | |
1124 | * @mdev: DRBD device. | |
1125 | * @w: work object. | |
1126 | * @cancel: The connection will be closed anyways (unused in this callback) | |
1127 | */ | |
1128 | int w_e_reissue(struct drbd_conf *mdev, struct drbd_work *w, int cancel) __releases(local) | |
1129 | { | |
1130 | struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; | |
1131 | struct bio *bio = e->private_bio; | |
1132 | ||
1133 | /* We leave DE_CONTAINS_A_BARRIER and EE_IS_BARRIER in place, | |
1134 | (and DE_BARRIER_IN_NEXT_EPOCH_ISSUED in the previous Epoch) | |
1135 | so that we can finish that epoch in drbd_may_finish_epoch(). | |
1136 | That is necessary if we already have a long chain of Epochs, before | |
1137 | we realize that BIO_RW_BARRIER is actually not supported */ | |
1138 | ||
1139 | /* As long as the -ENOTSUPP on the barrier is reported immediately | |
1140 | that will never trigger. If it is reported late, we will just | |
1141 | print that warning and continue correctly for all future requests | |
1142 | with WO_bdev_flush */ | |
1143 | if (previous_epoch(mdev, e->epoch)) | |
1144 | dev_warn(DEV, "Write ordering was not enforced (one time event)\n"); | |
1145 | ||
1146 | /* prepare bio for re-submit, | |
1147 | * re-init volatile members */ | |
1148 | /* we still have a local reference, | |
1149 | * get_ldev was done in receive_Data. */ | |
1150 | bio->bi_bdev = mdev->ldev->backing_bdev; | |
1151 | bio->bi_sector = e->sector; | |
1152 | bio->bi_size = e->size; | |
1153 | bio->bi_idx = 0; | |
1154 | ||
1155 | bio->bi_flags &= ~(BIO_POOL_MASK - 1); | |
1156 | bio->bi_flags |= 1 << BIO_UPTODATE; | |
1157 | ||
1158 | /* don't know whether this is necessary: */ | |
1159 | bio->bi_phys_segments = 0; | |
1160 | bio->bi_next = NULL; | |
1161 | ||
1162 | /* these should be unchanged: */ | |
1163 | /* bio->bi_end_io = drbd_endio_write_sec; */ | |
1164 | /* bio->bi_vcnt = whatever; */ | |
1165 | ||
1166 | e->w.cb = e_end_block; | |
1167 | ||
1168 | /* This is no longer a barrier request. */ | |
1169 | bio->bi_rw &= ~(1UL << BIO_RW_BARRIER); | |
1170 | ||
1171 | drbd_generic_make_request(mdev, DRBD_FAULT_DT_WR, bio); | |
1172 | ||
1173 | return 1; | |
1174 | } | |
1175 | ||
1176 | static int receive_Barrier(struct drbd_conf *mdev, struct p_header *h) | |
1177 | { | |
1178 | int rv, issue_flush; | |
1179 | struct p_barrier *p = (struct p_barrier *)h; | |
1180 | struct drbd_epoch *epoch; | |
1181 | ||
1182 | ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; | |
1183 | ||
1184 | rv = drbd_recv(mdev, h->payload, h->length); | |
1185 | ERR_IF(rv != h->length) return FALSE; | |
1186 | ||
1187 | inc_unacked(mdev); | |
1188 | ||
1189 | if (mdev->net_conf->wire_protocol != DRBD_PROT_C) | |
1190 | drbd_kick_lo(mdev); | |
1191 | ||
1192 | mdev->current_epoch->barrier_nr = p->barrier; | |
1193 | rv = drbd_may_finish_epoch(mdev, mdev->current_epoch, EV_GOT_BARRIER_NR); | |
1194 | ||
1195 | /* P_BARRIER_ACK may imply that the corresponding extent is dropped from | |
1196 | * the activity log, which means it would not be resynced in case the | |
1197 | * R_PRIMARY crashes now. | |
1198 | * Therefore we must send the barrier_ack after the barrier request was | |
1199 | * completed. */ | |
1200 | switch (mdev->write_ordering) { | |
1201 | case WO_bio_barrier: | |
1202 | case WO_none: | |
1203 | if (rv == FE_RECYCLED) | |
1204 | return TRUE; | |
1205 | break; | |
1206 | ||
1207 | case WO_bdev_flush: | |
1208 | case WO_drain_io: | |
367a8d73 PR |
1209 | if (rv == FE_STILL_LIVE) { |
1210 | set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &mdev->current_epoch->flags); | |
1211 | drbd_wait_ee_list_empty(mdev, &mdev->active_ee); | |
1212 | rv = drbd_flush_after_epoch(mdev, mdev->current_epoch); | |
1213 | } | |
b411b363 PR |
1214 | if (rv == FE_RECYCLED) |
1215 | return TRUE; | |
1216 | ||
1217 | /* The asender will send all the ACKs and barrier ACKs out, since | |
1218 | all EEs moved from the active_ee to the done_ee. We need to | |
1219 | provide a new epoch object for the EEs that come in soon */ | |
1220 | break; | |
1221 | } | |
1222 | ||
1223 | /* receiver context, in the writeout path of the other node. | |
1224 | * avoid potential distributed deadlock */ | |
1225 | epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); | |
1226 | if (!epoch) { | |
1227 | dev_warn(DEV, "Allocation of an epoch failed, slowing down\n"); | |
d3db7b48 | 1228 | issue_flush = !test_and_set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &mdev->current_epoch->flags); |
b411b363 PR |
1229 | drbd_wait_ee_list_empty(mdev, &mdev->active_ee); |
1230 | if (issue_flush) { | |
1231 | rv = drbd_flush_after_epoch(mdev, mdev->current_epoch); | |
1232 | if (rv == FE_RECYCLED) | |
1233 | return TRUE; | |
1234 | } | |
1235 | ||
1236 | drbd_wait_ee_list_empty(mdev, &mdev->done_ee); | |
1237 | ||
1238 | return TRUE; | |
1239 | } | |
1240 | ||
1241 | epoch->flags = 0; | |
1242 | atomic_set(&epoch->epoch_size, 0); | |
1243 | atomic_set(&epoch->active, 0); | |
1244 | ||
1245 | spin_lock(&mdev->epoch_lock); | |
1246 | if (atomic_read(&mdev->current_epoch->epoch_size)) { | |
1247 | list_add(&epoch->list, &mdev->current_epoch->list); | |
1248 | mdev->current_epoch = epoch; | |
1249 | mdev->epochs++; | |
b411b363 PR |
1250 | } else { |
1251 | /* The current_epoch got recycled while we allocated this one... */ | |
1252 | kfree(epoch); | |
1253 | } | |
1254 | spin_unlock(&mdev->epoch_lock); | |
1255 | ||
1256 | return TRUE; | |
1257 | } | |
1258 | ||
1259 | /* used from receive_RSDataReply (recv_resync_read) | |
1260 | * and from receive_Data */ | |
1261 | static struct drbd_epoch_entry * | |
1262 | read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, int data_size) __must_hold(local) | |
1263 | { | |
1264 | struct drbd_epoch_entry *e; | |
1265 | struct bio_vec *bvec; | |
1266 | struct page *page; | |
1267 | struct bio *bio; | |
1268 | int dgs, ds, i, rr; | |
1269 | void *dig_in = mdev->int_dig_in; | |
1270 | void *dig_vv = mdev->int_dig_vv; | |
1271 | ||
1272 | dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ? | |
1273 | crypto_hash_digestsize(mdev->integrity_r_tfm) : 0; | |
1274 | ||
1275 | if (dgs) { | |
1276 | rr = drbd_recv(mdev, dig_in, dgs); | |
1277 | if (rr != dgs) { | |
1278 | dev_warn(DEV, "short read receiving data digest: read %d expected %d\n", | |
1279 | rr, dgs); | |
1280 | return NULL; | |
1281 | } | |
1282 | } | |
1283 | ||
1284 | data_size -= dgs; | |
1285 | ||
1286 | ERR_IF(data_size & 0x1ff) return NULL; | |
1287 | ERR_IF(data_size > DRBD_MAX_SEGMENT_SIZE) return NULL; | |
1288 | ||
1289 | /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD | |
1290 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
1291 | * which in turn might block on the other node at this very place. */ | |
1292 | e = drbd_alloc_ee(mdev, id, sector, data_size, GFP_NOIO); | |
1293 | if (!e) | |
1294 | return NULL; | |
1295 | bio = e->private_bio; | |
1296 | ds = data_size; | |
1297 | bio_for_each_segment(bvec, bio, i) { | |
1298 | page = bvec->bv_page; | |
1299 | rr = drbd_recv(mdev, kmap(page), min_t(int, ds, PAGE_SIZE)); | |
1300 | kunmap(page); | |
1301 | if (rr != min_t(int, ds, PAGE_SIZE)) { | |
1302 | drbd_free_ee(mdev, e); | |
1303 | dev_warn(DEV, "short read receiving data: read %d expected %d\n", | |
1304 | rr, min_t(int, ds, PAGE_SIZE)); | |
1305 | return NULL; | |
1306 | } | |
1307 | ds -= rr; | |
1308 | } | |
1309 | ||
1310 | if (dgs) { | |
1311 | drbd_csum(mdev, mdev->integrity_r_tfm, bio, dig_vv); | |
1312 | if (memcmp(dig_in, dig_vv, dgs)) { | |
1313 | dev_err(DEV, "Digest integrity check FAILED.\n"); | |
1314 | drbd_bcast_ee(mdev, "digest failed", | |
1315 | dgs, dig_in, dig_vv, e); | |
1316 | drbd_free_ee(mdev, e); | |
1317 | return NULL; | |
1318 | } | |
1319 | } | |
1320 | mdev->recv_cnt += data_size>>9; | |
1321 | return e; | |
1322 | } | |
1323 | ||
1324 | /* drbd_drain_block() just takes a data block | |
1325 | * out of the socket input buffer, and discards it. | |
1326 | */ | |
1327 | static int drbd_drain_block(struct drbd_conf *mdev, int data_size) | |
1328 | { | |
1329 | struct page *page; | |
1330 | int rr, rv = 1; | |
1331 | void *data; | |
1332 | ||
1333 | page = drbd_pp_alloc(mdev, 1); | |
1334 | ||
1335 | data = kmap(page); | |
1336 | while (data_size) { | |
1337 | rr = drbd_recv(mdev, data, min_t(int, data_size, PAGE_SIZE)); | |
1338 | if (rr != min_t(int, data_size, PAGE_SIZE)) { | |
1339 | rv = 0; | |
1340 | dev_warn(DEV, "short read receiving data: read %d expected %d\n", | |
1341 | rr, min_t(int, data_size, PAGE_SIZE)); | |
1342 | break; | |
1343 | } | |
1344 | data_size -= rr; | |
1345 | } | |
1346 | kunmap(page); | |
1347 | drbd_pp_free(mdev, page); | |
1348 | return rv; | |
1349 | } | |
1350 | ||
1351 | static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req, | |
1352 | sector_t sector, int data_size) | |
1353 | { | |
1354 | struct bio_vec *bvec; | |
1355 | struct bio *bio; | |
1356 | int dgs, rr, i, expect; | |
1357 | void *dig_in = mdev->int_dig_in; | |
1358 | void *dig_vv = mdev->int_dig_vv; | |
1359 | ||
1360 | dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ? | |
1361 | crypto_hash_digestsize(mdev->integrity_r_tfm) : 0; | |
1362 | ||
1363 | if (dgs) { | |
1364 | rr = drbd_recv(mdev, dig_in, dgs); | |
1365 | if (rr != dgs) { | |
1366 | dev_warn(DEV, "short read receiving data reply digest: read %d expected %d\n", | |
1367 | rr, dgs); | |
1368 | return 0; | |
1369 | } | |
1370 | } | |
1371 | ||
1372 | data_size -= dgs; | |
1373 | ||
1374 | /* optimistically update recv_cnt. if receiving fails below, | |
1375 | * we disconnect anyways, and counters will be reset. */ | |
1376 | mdev->recv_cnt += data_size>>9; | |
1377 | ||
1378 | bio = req->master_bio; | |
1379 | D_ASSERT(sector == bio->bi_sector); | |
1380 | ||
1381 | bio_for_each_segment(bvec, bio, i) { | |
1382 | expect = min_t(int, data_size, bvec->bv_len); | |
1383 | rr = drbd_recv(mdev, | |
1384 | kmap(bvec->bv_page)+bvec->bv_offset, | |
1385 | expect); | |
1386 | kunmap(bvec->bv_page); | |
1387 | if (rr != expect) { | |
1388 | dev_warn(DEV, "short read receiving data reply: " | |
1389 | "read %d expected %d\n", | |
1390 | rr, expect); | |
1391 | return 0; | |
1392 | } | |
1393 | data_size -= rr; | |
1394 | } | |
1395 | ||
1396 | if (dgs) { | |
1397 | drbd_csum(mdev, mdev->integrity_r_tfm, bio, dig_vv); | |
1398 | if (memcmp(dig_in, dig_vv, dgs)) { | |
1399 | dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n"); | |
1400 | return 0; | |
1401 | } | |
1402 | } | |
1403 | ||
1404 | D_ASSERT(data_size == 0); | |
1405 | return 1; | |
1406 | } | |
1407 | ||
1408 | /* e_end_resync_block() is called via | |
1409 | * drbd_process_done_ee() by asender only */ | |
1410 | static int e_end_resync_block(struct drbd_conf *mdev, struct drbd_work *w, int unused) | |
1411 | { | |
1412 | struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; | |
1413 | sector_t sector = e->sector; | |
1414 | int ok; | |
1415 | ||
1416 | D_ASSERT(hlist_unhashed(&e->colision)); | |
1417 | ||
1418 | if (likely(drbd_bio_uptodate(e->private_bio))) { | |
1419 | drbd_set_in_sync(mdev, sector, e->size); | |
1420 | ok = drbd_send_ack(mdev, P_RS_WRITE_ACK, e); | |
1421 | } else { | |
1422 | /* Record failure to sync */ | |
1423 | drbd_rs_failed_io(mdev, sector, e->size); | |
1424 | ||
1425 | ok = drbd_send_ack(mdev, P_NEG_ACK, e); | |
1426 | } | |
1427 | dec_unacked(mdev); | |
1428 | ||
1429 | return ok; | |
1430 | } | |
1431 | ||
1432 | static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local) | |
1433 | { | |
1434 | struct drbd_epoch_entry *e; | |
1435 | ||
1436 | e = read_in_block(mdev, ID_SYNCER, sector, data_size); | |
1437 | if (!e) { | |
1438 | put_ldev(mdev); | |
1439 | return FALSE; | |
1440 | } | |
1441 | ||
1442 | dec_rs_pending(mdev); | |
1443 | ||
1444 | e->private_bio->bi_end_io = drbd_endio_write_sec; | |
1445 | e->private_bio->bi_rw = WRITE; | |
1446 | e->w.cb = e_end_resync_block; | |
1447 | ||
1448 | inc_unacked(mdev); | |
1449 | /* corresponding dec_unacked() in e_end_resync_block() | |
1450 | * respective _drbd_clear_done_ee */ | |
1451 | ||
1452 | spin_lock_irq(&mdev->req_lock); | |
1453 | list_add(&e->w.list, &mdev->sync_ee); | |
1454 | spin_unlock_irq(&mdev->req_lock); | |
1455 | ||
b411b363 PR |
1456 | drbd_generic_make_request(mdev, DRBD_FAULT_RS_WR, e->private_bio); |
1457 | /* accounting done in endio */ | |
1458 | ||
1459 | maybe_kick_lo(mdev); | |
1460 | return TRUE; | |
1461 | } | |
1462 | ||
1463 | static int receive_DataReply(struct drbd_conf *mdev, struct p_header *h) | |
1464 | { | |
1465 | struct drbd_request *req; | |
1466 | sector_t sector; | |
1467 | unsigned int header_size, data_size; | |
1468 | int ok; | |
1469 | struct p_data *p = (struct p_data *)h; | |
1470 | ||
1471 | header_size = sizeof(*p) - sizeof(*h); | |
1472 | data_size = h->length - header_size; | |
1473 | ||
1474 | ERR_IF(data_size == 0) return FALSE; | |
1475 | ||
1476 | if (drbd_recv(mdev, h->payload, header_size) != header_size) | |
1477 | return FALSE; | |
1478 | ||
1479 | sector = be64_to_cpu(p->sector); | |
1480 | ||
1481 | spin_lock_irq(&mdev->req_lock); | |
1482 | req = _ar_id_to_req(mdev, p->block_id, sector); | |
1483 | spin_unlock_irq(&mdev->req_lock); | |
1484 | if (unlikely(!req)) { | |
1485 | dev_err(DEV, "Got a corrupt block_id/sector pair(1).\n"); | |
1486 | return FALSE; | |
1487 | } | |
1488 | ||
1489 | /* hlist_del(&req->colision) is done in _req_may_be_done, to avoid | |
1490 | * special casing it there for the various failure cases. | |
1491 | * still no race with drbd_fail_pending_reads */ | |
1492 | ok = recv_dless_read(mdev, req, sector, data_size); | |
1493 | ||
1494 | if (ok) | |
1495 | req_mod(req, data_received); | |
1496 | /* else: nothing. handled from drbd_disconnect... | |
1497 | * I don't think we may complete this just yet | |
1498 | * in case we are "on-disconnect: freeze" */ | |
1499 | ||
1500 | return ok; | |
1501 | } | |
1502 | ||
1503 | static int receive_RSDataReply(struct drbd_conf *mdev, struct p_header *h) | |
1504 | { | |
1505 | sector_t sector; | |
1506 | unsigned int header_size, data_size; | |
1507 | int ok; | |
1508 | struct p_data *p = (struct p_data *)h; | |
1509 | ||
1510 | header_size = sizeof(*p) - sizeof(*h); | |
1511 | data_size = h->length - header_size; | |
1512 | ||
1513 | ERR_IF(data_size == 0) return FALSE; | |
1514 | ||
1515 | if (drbd_recv(mdev, h->payload, header_size) != header_size) | |
1516 | return FALSE; | |
1517 | ||
1518 | sector = be64_to_cpu(p->sector); | |
1519 | D_ASSERT(p->block_id == ID_SYNCER); | |
1520 | ||
1521 | if (get_ldev(mdev)) { | |
1522 | /* data is submitted to disk within recv_resync_read. | |
1523 | * corresponding put_ldev done below on error, | |
1524 | * or in drbd_endio_write_sec. */ | |
1525 | ok = recv_resync_read(mdev, sector, data_size); | |
1526 | } else { | |
1527 | if (__ratelimit(&drbd_ratelimit_state)) | |
1528 | dev_err(DEV, "Can not write resync data to local disk.\n"); | |
1529 | ||
1530 | ok = drbd_drain_block(mdev, data_size); | |
1531 | ||
1532 | drbd_send_ack_dp(mdev, P_NEG_ACK, p); | |
1533 | } | |
1534 | ||
1535 | return ok; | |
1536 | } | |
1537 | ||
1538 | /* e_end_block() is called via drbd_process_done_ee(). | |
1539 | * this means this function only runs in the asender thread | |
1540 | */ | |
1541 | static int e_end_block(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1542 | { | |
1543 | struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; | |
1544 | sector_t sector = e->sector; | |
1545 | struct drbd_epoch *epoch; | |
1546 | int ok = 1, pcmd; | |
1547 | ||
1548 | if (e->flags & EE_IS_BARRIER) { | |
1549 | epoch = previous_epoch(mdev, e->epoch); | |
1550 | if (epoch) | |
1551 | drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE + (cancel ? EV_CLEANUP : 0)); | |
1552 | } | |
1553 | ||
1554 | if (mdev->net_conf->wire_protocol == DRBD_PROT_C) { | |
1555 | if (likely(drbd_bio_uptodate(e->private_bio))) { | |
1556 | pcmd = (mdev->state.conn >= C_SYNC_SOURCE && | |
1557 | mdev->state.conn <= C_PAUSED_SYNC_T && | |
1558 | e->flags & EE_MAY_SET_IN_SYNC) ? | |
1559 | P_RS_WRITE_ACK : P_WRITE_ACK; | |
1560 | ok &= drbd_send_ack(mdev, pcmd, e); | |
1561 | if (pcmd == P_RS_WRITE_ACK) | |
1562 | drbd_set_in_sync(mdev, sector, e->size); | |
1563 | } else { | |
1564 | ok = drbd_send_ack(mdev, P_NEG_ACK, e); | |
1565 | /* we expect it to be marked out of sync anyways... | |
1566 | * maybe assert this? */ | |
1567 | } | |
1568 | dec_unacked(mdev); | |
1569 | } | |
1570 | /* we delete from the conflict detection hash _after_ we sent out the | |
1571 | * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ | |
1572 | if (mdev->net_conf->two_primaries) { | |
1573 | spin_lock_irq(&mdev->req_lock); | |
1574 | D_ASSERT(!hlist_unhashed(&e->colision)); | |
1575 | hlist_del_init(&e->colision); | |
1576 | spin_unlock_irq(&mdev->req_lock); | |
1577 | } else { | |
1578 | D_ASSERT(hlist_unhashed(&e->colision)); | |
1579 | } | |
1580 | ||
1581 | drbd_may_finish_epoch(mdev, e->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); | |
1582 | ||
1583 | return ok; | |
1584 | } | |
1585 | ||
1586 | static int e_send_discard_ack(struct drbd_conf *mdev, struct drbd_work *w, int unused) | |
1587 | { | |
1588 | struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; | |
1589 | int ok = 1; | |
1590 | ||
1591 | D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); | |
1592 | ok = drbd_send_ack(mdev, P_DISCARD_ACK, e); | |
1593 | ||
1594 | spin_lock_irq(&mdev->req_lock); | |
1595 | D_ASSERT(!hlist_unhashed(&e->colision)); | |
1596 | hlist_del_init(&e->colision); | |
1597 | spin_unlock_irq(&mdev->req_lock); | |
1598 | ||
1599 | dec_unacked(mdev); | |
1600 | ||
1601 | return ok; | |
1602 | } | |
1603 | ||
1604 | /* Called from receive_Data. | |
1605 | * Synchronize packets on sock with packets on msock. | |
1606 | * | |
1607 | * This is here so even when a P_DATA packet traveling via sock overtook an Ack | |
1608 | * packet traveling on msock, they are still processed in the order they have | |
1609 | * been sent. | |
1610 | * | |
1611 | * Note: we don't care for Ack packets overtaking P_DATA packets. | |
1612 | * | |
1613 | * In case packet_seq is larger than mdev->peer_seq number, there are | |
1614 | * outstanding packets on the msock. We wait for them to arrive. | |
1615 | * In case we are the logically next packet, we update mdev->peer_seq | |
1616 | * ourselves. Correctly handles 32bit wrap around. | |
1617 | * | |
1618 | * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, | |
1619 | * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds | |
1620 | * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have | |
1621 | * 1<<9 == 512 seconds aka ages for the 32bit wrap around... | |
1622 | * | |
1623 | * returns 0 if we may process the packet, | |
1624 | * -ERESTARTSYS if we were interrupted (by disconnect signal). */ | |
1625 | static int drbd_wait_peer_seq(struct drbd_conf *mdev, const u32 packet_seq) | |
1626 | { | |
1627 | DEFINE_WAIT(wait); | |
1628 | unsigned int p_seq; | |
1629 | long timeout; | |
1630 | int ret = 0; | |
1631 | spin_lock(&mdev->peer_seq_lock); | |
1632 | for (;;) { | |
1633 | prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE); | |
1634 | if (seq_le(packet_seq, mdev->peer_seq+1)) | |
1635 | break; | |
1636 | if (signal_pending(current)) { | |
1637 | ret = -ERESTARTSYS; | |
1638 | break; | |
1639 | } | |
1640 | p_seq = mdev->peer_seq; | |
1641 | spin_unlock(&mdev->peer_seq_lock); | |
1642 | timeout = schedule_timeout(30*HZ); | |
1643 | spin_lock(&mdev->peer_seq_lock); | |
1644 | if (timeout == 0 && p_seq == mdev->peer_seq) { | |
1645 | ret = -ETIMEDOUT; | |
1646 | dev_err(DEV, "ASSERT FAILED waited 30 seconds for sequence update, forcing reconnect\n"); | |
1647 | break; | |
1648 | } | |
1649 | } | |
1650 | finish_wait(&mdev->seq_wait, &wait); | |
1651 | if (mdev->peer_seq+1 == packet_seq) | |
1652 | mdev->peer_seq++; | |
1653 | spin_unlock(&mdev->peer_seq_lock); | |
1654 | return ret; | |
1655 | } | |
1656 | ||
1657 | /* mirrored write */ | |
1658 | static int receive_Data(struct drbd_conf *mdev, struct p_header *h) | |
1659 | { | |
1660 | sector_t sector; | |
1661 | struct drbd_epoch_entry *e; | |
1662 | struct p_data *p = (struct p_data *)h; | |
1663 | int header_size, data_size; | |
1664 | int rw = WRITE; | |
1665 | u32 dp_flags; | |
1666 | ||
1667 | header_size = sizeof(*p) - sizeof(*h); | |
1668 | data_size = h->length - header_size; | |
1669 | ||
1670 | ERR_IF(data_size == 0) return FALSE; | |
1671 | ||
1672 | if (drbd_recv(mdev, h->payload, header_size) != header_size) | |
1673 | return FALSE; | |
1674 | ||
1675 | if (!get_ldev(mdev)) { | |
1676 | if (__ratelimit(&drbd_ratelimit_state)) | |
1677 | dev_err(DEV, "Can not write mirrored data block " | |
1678 | "to local disk.\n"); | |
1679 | spin_lock(&mdev->peer_seq_lock); | |
1680 | if (mdev->peer_seq+1 == be32_to_cpu(p->seq_num)) | |
1681 | mdev->peer_seq++; | |
1682 | spin_unlock(&mdev->peer_seq_lock); | |
1683 | ||
1684 | drbd_send_ack_dp(mdev, P_NEG_ACK, p); | |
1685 | atomic_inc(&mdev->current_epoch->epoch_size); | |
1686 | return drbd_drain_block(mdev, data_size); | |
1687 | } | |
1688 | ||
1689 | /* get_ldev(mdev) successful. | |
1690 | * Corresponding put_ldev done either below (on various errors), | |
1691 | * or in drbd_endio_write_sec, if we successfully submit the data at | |
1692 | * the end of this function. */ | |
1693 | ||
1694 | sector = be64_to_cpu(p->sector); | |
1695 | e = read_in_block(mdev, p->block_id, sector, data_size); | |
1696 | if (!e) { | |
1697 | put_ldev(mdev); | |
1698 | return FALSE; | |
1699 | } | |
1700 | ||
1701 | e->private_bio->bi_end_io = drbd_endio_write_sec; | |
1702 | e->w.cb = e_end_block; | |
1703 | ||
1704 | spin_lock(&mdev->epoch_lock); | |
1705 | e->epoch = mdev->current_epoch; | |
1706 | atomic_inc(&e->epoch->epoch_size); | |
1707 | atomic_inc(&e->epoch->active); | |
1708 | ||
1709 | if (mdev->write_ordering == WO_bio_barrier && atomic_read(&e->epoch->epoch_size) == 1) { | |
1710 | struct drbd_epoch *epoch; | |
1711 | /* Issue a barrier if we start a new epoch, and the previous epoch | |
1712 | was not a epoch containing a single request which already was | |
1713 | a Barrier. */ | |
1714 | epoch = list_entry(e->epoch->list.prev, struct drbd_epoch, list); | |
1715 | if (epoch == e->epoch) { | |
1716 | set_bit(DE_CONTAINS_A_BARRIER, &e->epoch->flags); | |
b411b363 PR |
1717 | rw |= (1<<BIO_RW_BARRIER); |
1718 | e->flags |= EE_IS_BARRIER; | |
1719 | } else { | |
1720 | if (atomic_read(&epoch->epoch_size) > 1 || | |
1721 | !test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags)) { | |
1722 | set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags); | |
b411b363 | 1723 | set_bit(DE_CONTAINS_A_BARRIER, &e->epoch->flags); |
b411b363 PR |
1724 | rw |= (1<<BIO_RW_BARRIER); |
1725 | e->flags |= EE_IS_BARRIER; | |
1726 | } | |
1727 | } | |
1728 | } | |
1729 | spin_unlock(&mdev->epoch_lock); | |
1730 | ||
1731 | dp_flags = be32_to_cpu(p->dp_flags); | |
1732 | if (dp_flags & DP_HARDBARRIER) { | |
1733 | dev_err(DEV, "ASSERT FAILED would have submitted barrier request\n"); | |
1734 | /* rw |= (1<<BIO_RW_BARRIER); */ | |
1735 | } | |
1736 | if (dp_flags & DP_RW_SYNC) | |
1737 | rw |= (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG); | |
1738 | if (dp_flags & DP_MAY_SET_IN_SYNC) | |
1739 | e->flags |= EE_MAY_SET_IN_SYNC; | |
1740 | ||
1741 | /* I'm the receiver, I do hold a net_cnt reference. */ | |
1742 | if (!mdev->net_conf->two_primaries) { | |
1743 | spin_lock_irq(&mdev->req_lock); | |
1744 | } else { | |
1745 | /* don't get the req_lock yet, | |
1746 | * we may sleep in drbd_wait_peer_seq */ | |
1747 | const int size = e->size; | |
1748 | const int discard = test_bit(DISCARD_CONCURRENT, &mdev->flags); | |
1749 | DEFINE_WAIT(wait); | |
1750 | struct drbd_request *i; | |
1751 | struct hlist_node *n; | |
1752 | struct hlist_head *slot; | |
1753 | int first; | |
1754 | ||
1755 | D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); | |
1756 | BUG_ON(mdev->ee_hash == NULL); | |
1757 | BUG_ON(mdev->tl_hash == NULL); | |
1758 | ||
1759 | /* conflict detection and handling: | |
1760 | * 1. wait on the sequence number, | |
1761 | * in case this data packet overtook ACK packets. | |
1762 | * 2. check our hash tables for conflicting requests. | |
1763 | * we only need to walk the tl_hash, since an ee can not | |
1764 | * have a conflict with an other ee: on the submitting | |
1765 | * node, the corresponding req had already been conflicting, | |
1766 | * and a conflicting req is never sent. | |
1767 | * | |
1768 | * Note: for two_primaries, we are protocol C, | |
1769 | * so there cannot be any request that is DONE | |
1770 | * but still on the transfer log. | |
1771 | * | |
1772 | * unconditionally add to the ee_hash. | |
1773 | * | |
1774 | * if no conflicting request is found: | |
1775 | * submit. | |
1776 | * | |
1777 | * if any conflicting request is found | |
1778 | * that has not yet been acked, | |
1779 | * AND I have the "discard concurrent writes" flag: | |
1780 | * queue (via done_ee) the P_DISCARD_ACK; OUT. | |
1781 | * | |
1782 | * if any conflicting request is found: | |
1783 | * block the receiver, waiting on misc_wait | |
1784 | * until no more conflicting requests are there, | |
1785 | * or we get interrupted (disconnect). | |
1786 | * | |
1787 | * we do not just write after local io completion of those | |
1788 | * requests, but only after req is done completely, i.e. | |
1789 | * we wait for the P_DISCARD_ACK to arrive! | |
1790 | * | |
1791 | * then proceed normally, i.e. submit. | |
1792 | */ | |
1793 | if (drbd_wait_peer_seq(mdev, be32_to_cpu(p->seq_num))) | |
1794 | goto out_interrupted; | |
1795 | ||
1796 | spin_lock_irq(&mdev->req_lock); | |
1797 | ||
1798 | hlist_add_head(&e->colision, ee_hash_slot(mdev, sector)); | |
1799 | ||
1800 | #define OVERLAPS overlaps(i->sector, i->size, sector, size) | |
1801 | slot = tl_hash_slot(mdev, sector); | |
1802 | first = 1; | |
1803 | for (;;) { | |
1804 | int have_unacked = 0; | |
1805 | int have_conflict = 0; | |
1806 | prepare_to_wait(&mdev->misc_wait, &wait, | |
1807 | TASK_INTERRUPTIBLE); | |
1808 | hlist_for_each_entry(i, n, slot, colision) { | |
1809 | if (OVERLAPS) { | |
1810 | /* only ALERT on first iteration, | |
1811 | * we may be woken up early... */ | |
1812 | if (first) | |
1813 | dev_alert(DEV, "%s[%u] Concurrent local write detected!" | |
1814 | " new: %llus +%u; pending: %llus +%u\n", | |
1815 | current->comm, current->pid, | |
1816 | (unsigned long long)sector, size, | |
1817 | (unsigned long long)i->sector, i->size); | |
1818 | if (i->rq_state & RQ_NET_PENDING) | |
1819 | ++have_unacked; | |
1820 | ++have_conflict; | |
1821 | } | |
1822 | } | |
1823 | #undef OVERLAPS | |
1824 | if (!have_conflict) | |
1825 | break; | |
1826 | ||
1827 | /* Discard Ack only for the _first_ iteration */ | |
1828 | if (first && discard && have_unacked) { | |
1829 | dev_alert(DEV, "Concurrent write! [DISCARD BY FLAG] sec=%llus\n", | |
1830 | (unsigned long long)sector); | |
1831 | inc_unacked(mdev); | |
1832 | e->w.cb = e_send_discard_ack; | |
1833 | list_add_tail(&e->w.list, &mdev->done_ee); | |
1834 | ||
1835 | spin_unlock_irq(&mdev->req_lock); | |
1836 | ||
1837 | /* we could probably send that P_DISCARD_ACK ourselves, | |
1838 | * but I don't like the receiver using the msock */ | |
1839 | ||
1840 | put_ldev(mdev); | |
1841 | wake_asender(mdev); | |
1842 | finish_wait(&mdev->misc_wait, &wait); | |
1843 | return TRUE; | |
1844 | } | |
1845 | ||
1846 | if (signal_pending(current)) { | |
1847 | hlist_del_init(&e->colision); | |
1848 | ||
1849 | spin_unlock_irq(&mdev->req_lock); | |
1850 | ||
1851 | finish_wait(&mdev->misc_wait, &wait); | |
1852 | goto out_interrupted; | |
1853 | } | |
1854 | ||
1855 | spin_unlock_irq(&mdev->req_lock); | |
1856 | if (first) { | |
1857 | first = 0; | |
1858 | dev_alert(DEV, "Concurrent write! [W AFTERWARDS] " | |
1859 | "sec=%llus\n", (unsigned long long)sector); | |
1860 | } else if (discard) { | |
1861 | /* we had none on the first iteration. | |
1862 | * there must be none now. */ | |
1863 | D_ASSERT(have_unacked == 0); | |
1864 | } | |
1865 | schedule(); | |
1866 | spin_lock_irq(&mdev->req_lock); | |
1867 | } | |
1868 | finish_wait(&mdev->misc_wait, &wait); | |
1869 | } | |
1870 | ||
1871 | list_add(&e->w.list, &mdev->active_ee); | |
1872 | spin_unlock_irq(&mdev->req_lock); | |
1873 | ||
1874 | switch (mdev->net_conf->wire_protocol) { | |
1875 | case DRBD_PROT_C: | |
1876 | inc_unacked(mdev); | |
1877 | /* corresponding dec_unacked() in e_end_block() | |
1878 | * respective _drbd_clear_done_ee */ | |
1879 | break; | |
1880 | case DRBD_PROT_B: | |
1881 | /* I really don't like it that the receiver thread | |
1882 | * sends on the msock, but anyways */ | |
1883 | drbd_send_ack(mdev, P_RECV_ACK, e); | |
1884 | break; | |
1885 | case DRBD_PROT_A: | |
1886 | /* nothing to do */ | |
1887 | break; | |
1888 | } | |
1889 | ||
1890 | if (mdev->state.pdsk == D_DISKLESS) { | |
1891 | /* In case we have the only disk of the cluster, */ | |
1892 | drbd_set_out_of_sync(mdev, e->sector, e->size); | |
1893 | e->flags |= EE_CALL_AL_COMPLETE_IO; | |
1894 | drbd_al_begin_io(mdev, e->sector); | |
1895 | } | |
1896 | ||
1897 | e->private_bio->bi_rw = rw; | |
b411b363 PR |
1898 | drbd_generic_make_request(mdev, DRBD_FAULT_DT_WR, e->private_bio); |
1899 | /* accounting done in endio */ | |
1900 | ||
1901 | maybe_kick_lo(mdev); | |
1902 | return TRUE; | |
1903 | ||
1904 | out_interrupted: | |
1905 | /* yes, the epoch_size now is imbalanced. | |
1906 | * but we drop the connection anyways, so we don't have a chance to | |
1907 | * receive a barrier... atomic_inc(&mdev->epoch_size); */ | |
1908 | put_ldev(mdev); | |
1909 | drbd_free_ee(mdev, e); | |
1910 | return FALSE; | |
1911 | } | |
1912 | ||
1913 | static int receive_DataRequest(struct drbd_conf *mdev, struct p_header *h) | |
1914 | { | |
1915 | sector_t sector; | |
1916 | const sector_t capacity = drbd_get_capacity(mdev->this_bdev); | |
1917 | struct drbd_epoch_entry *e; | |
1918 | struct digest_info *di = NULL; | |
1919 | int size, digest_size; | |
1920 | unsigned int fault_type; | |
1921 | struct p_block_req *p = | |
1922 | (struct p_block_req *)h; | |
1923 | const int brps = sizeof(*p)-sizeof(*h); | |
1924 | ||
1925 | if (drbd_recv(mdev, h->payload, brps) != brps) | |
1926 | return FALSE; | |
1927 | ||
1928 | sector = be64_to_cpu(p->sector); | |
1929 | size = be32_to_cpu(p->blksize); | |
1930 | ||
1931 | if (size <= 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_SEGMENT_SIZE) { | |
1932 | dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, | |
1933 | (unsigned long long)sector, size); | |
1934 | return FALSE; | |
1935 | } | |
1936 | if (sector + (size>>9) > capacity) { | |
1937 | dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, | |
1938 | (unsigned long long)sector, size); | |
1939 | return FALSE; | |
1940 | } | |
1941 | ||
1942 | if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) { | |
1943 | if (__ratelimit(&drbd_ratelimit_state)) | |
1944 | dev_err(DEV, "Can not satisfy peer's read request, " | |
1945 | "no local data.\n"); | |
1946 | drbd_send_ack_rp(mdev, h->command == P_DATA_REQUEST ? P_NEG_DREPLY : | |
1947 | P_NEG_RS_DREPLY , p); | |
1948 | return TRUE; | |
1949 | } | |
1950 | ||
1951 | /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD | |
1952 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
1953 | * which in turn might block on the other node at this very place. */ | |
1954 | e = drbd_alloc_ee(mdev, p->block_id, sector, size, GFP_NOIO); | |
1955 | if (!e) { | |
1956 | put_ldev(mdev); | |
1957 | return FALSE; | |
1958 | } | |
1959 | ||
1960 | e->private_bio->bi_rw = READ; | |
1961 | e->private_bio->bi_end_io = drbd_endio_read_sec; | |
1962 | ||
1963 | switch (h->command) { | |
1964 | case P_DATA_REQUEST: | |
1965 | e->w.cb = w_e_end_data_req; | |
1966 | fault_type = DRBD_FAULT_DT_RD; | |
1967 | break; | |
1968 | case P_RS_DATA_REQUEST: | |
1969 | e->w.cb = w_e_end_rsdata_req; | |
1970 | fault_type = DRBD_FAULT_RS_RD; | |
1971 | /* Eventually this should become asynchronously. Currently it | |
1972 | * blocks the whole receiver just to delay the reading of a | |
1973 | * resync data block. | |
1974 | * the drbd_work_queue mechanism is made for this... | |
1975 | */ | |
1976 | if (!drbd_rs_begin_io(mdev, sector)) { | |
1977 | /* we have been interrupted, | |
1978 | * probably connection lost! */ | |
1979 | D_ASSERT(signal_pending(current)); | |
1980 | goto out_free_e; | |
1981 | } | |
1982 | break; | |
1983 | ||
1984 | case P_OV_REPLY: | |
1985 | case P_CSUM_RS_REQUEST: | |
1986 | fault_type = DRBD_FAULT_RS_RD; | |
1987 | digest_size = h->length - brps ; | |
1988 | di = kmalloc(sizeof(*di) + digest_size, GFP_NOIO); | |
1989 | if (!di) | |
1990 | goto out_free_e; | |
1991 | ||
1992 | di->digest_size = digest_size; | |
1993 | di->digest = (((char *)di)+sizeof(struct digest_info)); | |
1994 | ||
1995 | if (drbd_recv(mdev, di->digest, digest_size) != digest_size) | |
1996 | goto out_free_e; | |
1997 | ||
1998 | e->block_id = (u64)(unsigned long)di; | |
1999 | if (h->command == P_CSUM_RS_REQUEST) { | |
2000 | D_ASSERT(mdev->agreed_pro_version >= 89); | |
2001 | e->w.cb = w_e_end_csum_rs_req; | |
2002 | } else if (h->command == P_OV_REPLY) { | |
2003 | e->w.cb = w_e_end_ov_reply; | |
2004 | dec_rs_pending(mdev); | |
2005 | break; | |
2006 | } | |
2007 | ||
2008 | if (!drbd_rs_begin_io(mdev, sector)) { | |
2009 | /* we have been interrupted, probably connection lost! */ | |
2010 | D_ASSERT(signal_pending(current)); | |
2011 | goto out_free_e; | |
2012 | } | |
2013 | break; | |
2014 | ||
2015 | case P_OV_REQUEST: | |
2016 | if (mdev->state.conn >= C_CONNECTED && | |
2017 | mdev->state.conn != C_VERIFY_T) | |
2018 | dev_warn(DEV, "ASSERT FAILED: got P_OV_REQUEST while being %s\n", | |
2019 | drbd_conn_str(mdev->state.conn)); | |
2020 | if (mdev->ov_start_sector == ~(sector_t)0 && | |
2021 | mdev->agreed_pro_version >= 90) { | |
2022 | mdev->ov_start_sector = sector; | |
2023 | mdev->ov_position = sector; | |
2024 | mdev->ov_left = mdev->rs_total - BM_SECT_TO_BIT(sector); | |
2025 | dev_info(DEV, "Online Verify start sector: %llu\n", | |
2026 | (unsigned long long)sector); | |
2027 | } | |
2028 | e->w.cb = w_e_end_ov_req; | |
2029 | fault_type = DRBD_FAULT_RS_RD; | |
2030 | /* Eventually this should become asynchronous. Currently it | |
2031 | * blocks the whole receiver just to delay the reading of a | |
2032 | * resync data block. | |
2033 | * the drbd_work_queue mechanism is made for this... | |
2034 | */ | |
2035 | if (!drbd_rs_begin_io(mdev, sector)) { | |
2036 | /* we have been interrupted, | |
2037 | * probably connection lost! */ | |
2038 | D_ASSERT(signal_pending(current)); | |
2039 | goto out_free_e; | |
2040 | } | |
2041 | break; | |
2042 | ||
2043 | ||
2044 | default: | |
2045 | dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n", | |
2046 | cmdname(h->command)); | |
2047 | fault_type = DRBD_FAULT_MAX; | |
2048 | } | |
2049 | ||
2050 | spin_lock_irq(&mdev->req_lock); | |
2051 | list_add(&e->w.list, &mdev->read_ee); | |
2052 | spin_unlock_irq(&mdev->req_lock); | |
2053 | ||
2054 | inc_unacked(mdev); | |
2055 | ||
b411b363 PR |
2056 | drbd_generic_make_request(mdev, fault_type, e->private_bio); |
2057 | maybe_kick_lo(mdev); | |
2058 | ||
2059 | return TRUE; | |
2060 | ||
2061 | out_free_e: | |
2062 | kfree(di); | |
2063 | put_ldev(mdev); | |
2064 | drbd_free_ee(mdev, e); | |
2065 | return FALSE; | |
2066 | } | |
2067 | ||
2068 | static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local) | |
2069 | { | |
2070 | int self, peer, rv = -100; | |
2071 | unsigned long ch_self, ch_peer; | |
2072 | ||
2073 | self = mdev->ldev->md.uuid[UI_BITMAP] & 1; | |
2074 | peer = mdev->p_uuid[UI_BITMAP] & 1; | |
2075 | ||
2076 | ch_peer = mdev->p_uuid[UI_SIZE]; | |
2077 | ch_self = mdev->comm_bm_set; | |
2078 | ||
2079 | switch (mdev->net_conf->after_sb_0p) { | |
2080 | case ASB_CONSENSUS: | |
2081 | case ASB_DISCARD_SECONDARY: | |
2082 | case ASB_CALL_HELPER: | |
2083 | dev_err(DEV, "Configuration error.\n"); | |
2084 | break; | |
2085 | case ASB_DISCONNECT: | |
2086 | break; | |
2087 | case ASB_DISCARD_YOUNGER_PRI: | |
2088 | if (self == 0 && peer == 1) { | |
2089 | rv = -1; | |
2090 | break; | |
2091 | } | |
2092 | if (self == 1 && peer == 0) { | |
2093 | rv = 1; | |
2094 | break; | |
2095 | } | |
2096 | /* Else fall through to one of the other strategies... */ | |
2097 | case ASB_DISCARD_OLDER_PRI: | |
2098 | if (self == 0 && peer == 1) { | |
2099 | rv = 1; | |
2100 | break; | |
2101 | } | |
2102 | if (self == 1 && peer == 0) { | |
2103 | rv = -1; | |
2104 | break; | |
2105 | } | |
2106 | /* Else fall through to one of the other strategies... */ | |
ad19bf6e | 2107 | dev_warn(DEV, "Discard younger/older primary did not find a decision\n" |
b411b363 PR |
2108 | "Using discard-least-changes instead\n"); |
2109 | case ASB_DISCARD_ZERO_CHG: | |
2110 | if (ch_peer == 0 && ch_self == 0) { | |
2111 | rv = test_bit(DISCARD_CONCURRENT, &mdev->flags) | |
2112 | ? -1 : 1; | |
2113 | break; | |
2114 | } else { | |
2115 | if (ch_peer == 0) { rv = 1; break; } | |
2116 | if (ch_self == 0) { rv = -1; break; } | |
2117 | } | |
2118 | if (mdev->net_conf->after_sb_0p == ASB_DISCARD_ZERO_CHG) | |
2119 | break; | |
2120 | case ASB_DISCARD_LEAST_CHG: | |
2121 | if (ch_self < ch_peer) | |
2122 | rv = -1; | |
2123 | else if (ch_self > ch_peer) | |
2124 | rv = 1; | |
2125 | else /* ( ch_self == ch_peer ) */ | |
2126 | /* Well, then use something else. */ | |
2127 | rv = test_bit(DISCARD_CONCURRENT, &mdev->flags) | |
2128 | ? -1 : 1; | |
2129 | break; | |
2130 | case ASB_DISCARD_LOCAL: | |
2131 | rv = -1; | |
2132 | break; | |
2133 | case ASB_DISCARD_REMOTE: | |
2134 | rv = 1; | |
2135 | } | |
2136 | ||
2137 | return rv; | |
2138 | } | |
2139 | ||
2140 | static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local) | |
2141 | { | |
2142 | int self, peer, hg, rv = -100; | |
2143 | ||
2144 | self = mdev->ldev->md.uuid[UI_BITMAP] & 1; | |
2145 | peer = mdev->p_uuid[UI_BITMAP] & 1; | |
2146 | ||
2147 | switch (mdev->net_conf->after_sb_1p) { | |
2148 | case ASB_DISCARD_YOUNGER_PRI: | |
2149 | case ASB_DISCARD_OLDER_PRI: | |
2150 | case ASB_DISCARD_LEAST_CHG: | |
2151 | case ASB_DISCARD_LOCAL: | |
2152 | case ASB_DISCARD_REMOTE: | |
2153 | dev_err(DEV, "Configuration error.\n"); | |
2154 | break; | |
2155 | case ASB_DISCONNECT: | |
2156 | break; | |
2157 | case ASB_CONSENSUS: | |
2158 | hg = drbd_asb_recover_0p(mdev); | |
2159 | if (hg == -1 && mdev->state.role == R_SECONDARY) | |
2160 | rv = hg; | |
2161 | if (hg == 1 && mdev->state.role == R_PRIMARY) | |
2162 | rv = hg; | |
2163 | break; | |
2164 | case ASB_VIOLENTLY: | |
2165 | rv = drbd_asb_recover_0p(mdev); | |
2166 | break; | |
2167 | case ASB_DISCARD_SECONDARY: | |
2168 | return mdev->state.role == R_PRIMARY ? 1 : -1; | |
2169 | case ASB_CALL_HELPER: | |
2170 | hg = drbd_asb_recover_0p(mdev); | |
2171 | if (hg == -1 && mdev->state.role == R_PRIMARY) { | |
2172 | self = drbd_set_role(mdev, R_SECONDARY, 0); | |
2173 | /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, | |
2174 | * we might be here in C_WF_REPORT_PARAMS which is transient. | |
2175 | * we do not need to wait for the after state change work either. */ | |
2176 | self = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); | |
2177 | if (self != SS_SUCCESS) { | |
2178 | drbd_khelper(mdev, "pri-lost-after-sb"); | |
2179 | } else { | |
2180 | dev_warn(DEV, "Successfully gave up primary role.\n"); | |
2181 | rv = hg; | |
2182 | } | |
2183 | } else | |
2184 | rv = hg; | |
2185 | } | |
2186 | ||
2187 | return rv; | |
2188 | } | |
2189 | ||
2190 | static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local) | |
2191 | { | |
2192 | int self, peer, hg, rv = -100; | |
2193 | ||
2194 | self = mdev->ldev->md.uuid[UI_BITMAP] & 1; | |
2195 | peer = mdev->p_uuid[UI_BITMAP] & 1; | |
2196 | ||
2197 | switch (mdev->net_conf->after_sb_2p) { | |
2198 | case ASB_DISCARD_YOUNGER_PRI: | |
2199 | case ASB_DISCARD_OLDER_PRI: | |
2200 | case ASB_DISCARD_LEAST_CHG: | |
2201 | case ASB_DISCARD_LOCAL: | |
2202 | case ASB_DISCARD_REMOTE: | |
2203 | case ASB_CONSENSUS: | |
2204 | case ASB_DISCARD_SECONDARY: | |
2205 | dev_err(DEV, "Configuration error.\n"); | |
2206 | break; | |
2207 | case ASB_VIOLENTLY: | |
2208 | rv = drbd_asb_recover_0p(mdev); | |
2209 | break; | |
2210 | case ASB_DISCONNECT: | |
2211 | break; | |
2212 | case ASB_CALL_HELPER: | |
2213 | hg = drbd_asb_recover_0p(mdev); | |
2214 | if (hg == -1) { | |
2215 | /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, | |
2216 | * we might be here in C_WF_REPORT_PARAMS which is transient. | |
2217 | * we do not need to wait for the after state change work either. */ | |
2218 | self = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); | |
2219 | if (self != SS_SUCCESS) { | |
2220 | drbd_khelper(mdev, "pri-lost-after-sb"); | |
2221 | } else { | |
2222 | dev_warn(DEV, "Successfully gave up primary role.\n"); | |
2223 | rv = hg; | |
2224 | } | |
2225 | } else | |
2226 | rv = hg; | |
2227 | } | |
2228 | ||
2229 | return rv; | |
2230 | } | |
2231 | ||
2232 | static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid, | |
2233 | u64 bits, u64 flags) | |
2234 | { | |
2235 | if (!uuid) { | |
2236 | dev_info(DEV, "%s uuid info vanished while I was looking!\n", text); | |
2237 | return; | |
2238 | } | |
2239 | dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", | |
2240 | text, | |
2241 | (unsigned long long)uuid[UI_CURRENT], | |
2242 | (unsigned long long)uuid[UI_BITMAP], | |
2243 | (unsigned long long)uuid[UI_HISTORY_START], | |
2244 | (unsigned long long)uuid[UI_HISTORY_END], | |
2245 | (unsigned long long)bits, | |
2246 | (unsigned long long)flags); | |
2247 | } | |
2248 | ||
2249 | /* | |
2250 | 100 after split brain try auto recover | |
2251 | 2 C_SYNC_SOURCE set BitMap | |
2252 | 1 C_SYNC_SOURCE use BitMap | |
2253 | 0 no Sync | |
2254 | -1 C_SYNC_TARGET use BitMap | |
2255 | -2 C_SYNC_TARGET set BitMap | |
2256 | -100 after split brain, disconnect | |
2257 | -1000 unrelated data | |
2258 | */ | |
2259 | static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local) | |
2260 | { | |
2261 | u64 self, peer; | |
2262 | int i, j; | |
2263 | ||
2264 | self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); | |
2265 | peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); | |
2266 | ||
2267 | *rule_nr = 10; | |
2268 | if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) | |
2269 | return 0; | |
2270 | ||
2271 | *rule_nr = 20; | |
2272 | if ((self == UUID_JUST_CREATED || self == (u64)0) && | |
2273 | peer != UUID_JUST_CREATED) | |
2274 | return -2; | |
2275 | ||
2276 | *rule_nr = 30; | |
2277 | if (self != UUID_JUST_CREATED && | |
2278 | (peer == UUID_JUST_CREATED || peer == (u64)0)) | |
2279 | return 2; | |
2280 | ||
2281 | if (self == peer) { | |
2282 | int rct, dc; /* roles at crash time */ | |
2283 | ||
2284 | if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) { | |
2285 | ||
2286 | if (mdev->agreed_pro_version < 91) | |
2287 | return -1001; | |
2288 | ||
2289 | if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) && | |
2290 | (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { | |
2291 | dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n"); | |
2292 | drbd_uuid_set_bm(mdev, 0UL); | |
2293 | ||
2294 | drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, | |
2295 | mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); | |
2296 | *rule_nr = 34; | |
2297 | } else { | |
2298 | dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n"); | |
2299 | *rule_nr = 36; | |
2300 | } | |
2301 | ||
2302 | return 1; | |
2303 | } | |
2304 | ||
2305 | if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) { | |
2306 | ||
2307 | if (mdev->agreed_pro_version < 91) | |
2308 | return -1001; | |
2309 | ||
2310 | if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) && | |
2311 | (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) { | |
2312 | dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); | |
2313 | ||
2314 | mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START]; | |
2315 | mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP]; | |
2316 | mdev->p_uuid[UI_BITMAP] = 0UL; | |
2317 | ||
2318 | drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); | |
2319 | *rule_nr = 35; | |
2320 | } else { | |
2321 | dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n"); | |
2322 | *rule_nr = 37; | |
2323 | } | |
2324 | ||
2325 | return -1; | |
2326 | } | |
2327 | ||
2328 | /* Common power [off|failure] */ | |
2329 | rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) + | |
2330 | (mdev->p_uuid[UI_FLAGS] & 2); | |
2331 | /* lowest bit is set when we were primary, | |
2332 | * next bit (weight 2) is set when peer was primary */ | |
2333 | *rule_nr = 40; | |
2334 | ||
2335 | switch (rct) { | |
2336 | case 0: /* !self_pri && !peer_pri */ return 0; | |
2337 | case 1: /* self_pri && !peer_pri */ return 1; | |
2338 | case 2: /* !self_pri && peer_pri */ return -1; | |
2339 | case 3: /* self_pri && peer_pri */ | |
2340 | dc = test_bit(DISCARD_CONCURRENT, &mdev->flags); | |
2341 | return dc ? -1 : 1; | |
2342 | } | |
2343 | } | |
2344 | ||
2345 | *rule_nr = 50; | |
2346 | peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); | |
2347 | if (self == peer) | |
2348 | return -1; | |
2349 | ||
2350 | *rule_nr = 51; | |
2351 | peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); | |
2352 | if (self == peer) { | |
2353 | self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); | |
2354 | peer = mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1); | |
2355 | if (self == peer) { | |
2356 | /* The last P_SYNC_UUID did not get though. Undo the last start of | |
2357 | resync as sync source modifications of the peer's UUIDs. */ | |
2358 | ||
2359 | if (mdev->agreed_pro_version < 91) | |
2360 | return -1001; | |
2361 | ||
2362 | mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START]; | |
2363 | mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1]; | |
2364 | return -1; | |
2365 | } | |
2366 | } | |
2367 | ||
2368 | *rule_nr = 60; | |
2369 | self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); | |
2370 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { | |
2371 | peer = mdev->p_uuid[i] & ~((u64)1); | |
2372 | if (self == peer) | |
2373 | return -2; | |
2374 | } | |
2375 | ||
2376 | *rule_nr = 70; | |
2377 | self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); | |
2378 | peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); | |
2379 | if (self == peer) | |
2380 | return 1; | |
2381 | ||
2382 | *rule_nr = 71; | |
2383 | self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); | |
2384 | if (self == peer) { | |
2385 | self = mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1); | |
2386 | peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); | |
2387 | if (self == peer) { | |
2388 | /* The last P_SYNC_UUID did not get though. Undo the last start of | |
2389 | resync as sync source modifications of our UUIDs. */ | |
2390 | ||
2391 | if (mdev->agreed_pro_version < 91) | |
2392 | return -1001; | |
2393 | ||
2394 | _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]); | |
2395 | _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]); | |
2396 | ||
2397 | dev_info(DEV, "Undid last start of resync:\n"); | |
2398 | ||
2399 | drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, | |
2400 | mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); | |
2401 | ||
2402 | return 1; | |
2403 | } | |
2404 | } | |
2405 | ||
2406 | ||
2407 | *rule_nr = 80; | |
d8c2a36b | 2408 | peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); |
b411b363 PR |
2409 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { |
2410 | self = mdev->ldev->md.uuid[i] & ~((u64)1); | |
2411 | if (self == peer) | |
2412 | return 2; | |
2413 | } | |
2414 | ||
2415 | *rule_nr = 90; | |
2416 | self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); | |
2417 | peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); | |
2418 | if (self == peer && self != ((u64)0)) | |
2419 | return 100; | |
2420 | ||
2421 | *rule_nr = 100; | |
2422 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { | |
2423 | self = mdev->ldev->md.uuid[i] & ~((u64)1); | |
2424 | for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { | |
2425 | peer = mdev->p_uuid[j] & ~((u64)1); | |
2426 | if (self == peer) | |
2427 | return -100; | |
2428 | } | |
2429 | } | |
2430 | ||
2431 | return -1000; | |
2432 | } | |
2433 | ||
2434 | /* drbd_sync_handshake() returns the new conn state on success, or | |
2435 | CONN_MASK (-1) on failure. | |
2436 | */ | |
2437 | static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role, | |
2438 | enum drbd_disk_state peer_disk) __must_hold(local) | |
2439 | { | |
2440 | int hg, rule_nr; | |
2441 | enum drbd_conns rv = C_MASK; | |
2442 | enum drbd_disk_state mydisk; | |
2443 | ||
2444 | mydisk = mdev->state.disk; | |
2445 | if (mydisk == D_NEGOTIATING) | |
2446 | mydisk = mdev->new_state_tmp.disk; | |
2447 | ||
2448 | dev_info(DEV, "drbd_sync_handshake:\n"); | |
2449 | drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0); | |
2450 | drbd_uuid_dump(mdev, "peer", mdev->p_uuid, | |
2451 | mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); | |
2452 | ||
2453 | hg = drbd_uuid_compare(mdev, &rule_nr); | |
2454 | ||
2455 | dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr); | |
2456 | ||
2457 | if (hg == -1000) { | |
2458 | dev_alert(DEV, "Unrelated data, aborting!\n"); | |
2459 | return C_MASK; | |
2460 | } | |
2461 | if (hg == -1001) { | |
2462 | dev_alert(DEV, "To resolve this both sides have to support at least protocol\n"); | |
2463 | return C_MASK; | |
2464 | } | |
2465 | ||
2466 | if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || | |
2467 | (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { | |
2468 | int f = (hg == -100) || abs(hg) == 2; | |
2469 | hg = mydisk > D_INCONSISTENT ? 1 : -1; | |
2470 | if (f) | |
2471 | hg = hg*2; | |
2472 | dev_info(DEV, "Becoming sync %s due to disk states.\n", | |
2473 | hg > 0 ? "source" : "target"); | |
2474 | } | |
2475 | ||
2476 | if (hg == 100 || (hg == -100 && mdev->net_conf->always_asbp)) { | |
2477 | int pcount = (mdev->state.role == R_PRIMARY) | |
2478 | + (peer_role == R_PRIMARY); | |
2479 | int forced = (hg == -100); | |
2480 | ||
2481 | switch (pcount) { | |
2482 | case 0: | |
2483 | hg = drbd_asb_recover_0p(mdev); | |
2484 | break; | |
2485 | case 1: | |
2486 | hg = drbd_asb_recover_1p(mdev); | |
2487 | break; | |
2488 | case 2: | |
2489 | hg = drbd_asb_recover_2p(mdev); | |
2490 | break; | |
2491 | } | |
2492 | if (abs(hg) < 100) { | |
2493 | dev_warn(DEV, "Split-Brain detected, %d primaries, " | |
2494 | "automatically solved. Sync from %s node\n", | |
2495 | pcount, (hg < 0) ? "peer" : "this"); | |
2496 | if (forced) { | |
2497 | dev_warn(DEV, "Doing a full sync, since" | |
2498 | " UUIDs where ambiguous.\n"); | |
2499 | hg = hg*2; | |
2500 | } | |
2501 | } | |
2502 | } | |
2503 | ||
2504 | if (hg == -100) { | |
2505 | if (mdev->net_conf->want_lose && !(mdev->p_uuid[UI_FLAGS]&1)) | |
2506 | hg = -1; | |
2507 | if (!mdev->net_conf->want_lose && (mdev->p_uuid[UI_FLAGS]&1)) | |
2508 | hg = 1; | |
2509 | ||
2510 | if (abs(hg) < 100) | |
2511 | dev_warn(DEV, "Split-Brain detected, manually solved. " | |
2512 | "Sync from %s node\n", | |
2513 | (hg < 0) ? "peer" : "this"); | |
2514 | } | |
2515 | ||
2516 | if (hg == -100) { | |
580b9767 LE |
2517 | /* FIXME this log message is not correct if we end up here |
2518 | * after an attempted attach on a diskless node. | |
2519 | * We just refuse to attach -- well, we drop the "connection" | |
2520 | * to that disk, in a way... */ | |
b411b363 PR |
2521 | dev_alert(DEV, "Split-Brain detected, dropping connection!\n"); |
2522 | drbd_khelper(mdev, "split-brain"); | |
2523 | return C_MASK; | |
2524 | } | |
2525 | ||
2526 | if (hg > 0 && mydisk <= D_INCONSISTENT) { | |
2527 | dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n"); | |
2528 | return C_MASK; | |
2529 | } | |
2530 | ||
2531 | if (hg < 0 && /* by intention we do not use mydisk here. */ | |
2532 | mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) { | |
2533 | switch (mdev->net_conf->rr_conflict) { | |
2534 | case ASB_CALL_HELPER: | |
2535 | drbd_khelper(mdev, "pri-lost"); | |
2536 | /* fall through */ | |
2537 | case ASB_DISCONNECT: | |
2538 | dev_err(DEV, "I shall become SyncTarget, but I am primary!\n"); | |
2539 | return C_MASK; | |
2540 | case ASB_VIOLENTLY: | |
2541 | dev_warn(DEV, "Becoming SyncTarget, violating the stable-data" | |
2542 | "assumption\n"); | |
2543 | } | |
2544 | } | |
2545 | ||
cf14c2e9 PR |
2546 | if (mdev->net_conf->dry_run || test_bit(CONN_DRY_RUN, &mdev->flags)) { |
2547 | if (hg == 0) | |
2548 | dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n"); | |
2549 | else | |
2550 | dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.", | |
2551 | drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), | |
2552 | abs(hg) >= 2 ? "full" : "bit-map based"); | |
2553 | return C_MASK; | |
2554 | } | |
2555 | ||
b411b363 PR |
2556 | if (abs(hg) >= 2) { |
2557 | dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); | |
2558 | if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake")) | |
2559 | return C_MASK; | |
2560 | } | |
2561 | ||
2562 | if (hg > 0) { /* become sync source. */ | |
2563 | rv = C_WF_BITMAP_S; | |
2564 | } else if (hg < 0) { /* become sync target */ | |
2565 | rv = C_WF_BITMAP_T; | |
2566 | } else { | |
2567 | rv = C_CONNECTED; | |
2568 | if (drbd_bm_total_weight(mdev)) { | |
2569 | dev_info(DEV, "No resync, but %lu bits in bitmap!\n", | |
2570 | drbd_bm_total_weight(mdev)); | |
2571 | } | |
2572 | } | |
2573 | ||
2574 | return rv; | |
2575 | } | |
2576 | ||
2577 | /* returns 1 if invalid */ | |
2578 | static int cmp_after_sb(enum drbd_after_sb_p peer, enum drbd_after_sb_p self) | |
2579 | { | |
2580 | /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ | |
2581 | if ((peer == ASB_DISCARD_REMOTE && self == ASB_DISCARD_LOCAL) || | |
2582 | (self == ASB_DISCARD_REMOTE && peer == ASB_DISCARD_LOCAL)) | |
2583 | return 0; | |
2584 | ||
2585 | /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ | |
2586 | if (peer == ASB_DISCARD_REMOTE || peer == ASB_DISCARD_LOCAL || | |
2587 | self == ASB_DISCARD_REMOTE || self == ASB_DISCARD_LOCAL) | |
2588 | return 1; | |
2589 | ||
2590 | /* everything else is valid if they are equal on both sides. */ | |
2591 | if (peer == self) | |
2592 | return 0; | |
2593 | ||
2594 | /* everything es is invalid. */ | |
2595 | return 1; | |
2596 | } | |
2597 | ||
2598 | static int receive_protocol(struct drbd_conf *mdev, struct p_header *h) | |
2599 | { | |
2600 | struct p_protocol *p = (struct p_protocol *)h; | |
2601 | int header_size, data_size; | |
2602 | int p_proto, p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; | |
cf14c2e9 | 2603 | int p_want_lose, p_two_primaries, cf; |
b411b363 PR |
2604 | char p_integrity_alg[SHARED_SECRET_MAX] = ""; |
2605 | ||
2606 | header_size = sizeof(*p) - sizeof(*h); | |
2607 | data_size = h->length - header_size; | |
2608 | ||
2609 | if (drbd_recv(mdev, h->payload, header_size) != header_size) | |
2610 | return FALSE; | |
2611 | ||
2612 | p_proto = be32_to_cpu(p->protocol); | |
2613 | p_after_sb_0p = be32_to_cpu(p->after_sb_0p); | |
2614 | p_after_sb_1p = be32_to_cpu(p->after_sb_1p); | |
2615 | p_after_sb_2p = be32_to_cpu(p->after_sb_2p); | |
b411b363 | 2616 | p_two_primaries = be32_to_cpu(p->two_primaries); |
cf14c2e9 PR |
2617 | cf = be32_to_cpu(p->conn_flags); |
2618 | p_want_lose = cf & CF_WANT_LOSE; | |
2619 | ||
2620 | clear_bit(CONN_DRY_RUN, &mdev->flags); | |
2621 | ||
2622 | if (cf & CF_DRY_RUN) | |
2623 | set_bit(CONN_DRY_RUN, &mdev->flags); | |
b411b363 PR |
2624 | |
2625 | if (p_proto != mdev->net_conf->wire_protocol) { | |
2626 | dev_err(DEV, "incompatible communication protocols\n"); | |
2627 | goto disconnect; | |
2628 | } | |
2629 | ||
2630 | if (cmp_after_sb(p_after_sb_0p, mdev->net_conf->after_sb_0p)) { | |
2631 | dev_err(DEV, "incompatible after-sb-0pri settings\n"); | |
2632 | goto disconnect; | |
2633 | } | |
2634 | ||
2635 | if (cmp_after_sb(p_after_sb_1p, mdev->net_conf->after_sb_1p)) { | |
2636 | dev_err(DEV, "incompatible after-sb-1pri settings\n"); | |
2637 | goto disconnect; | |
2638 | } | |
2639 | ||
2640 | if (cmp_after_sb(p_after_sb_2p, mdev->net_conf->after_sb_2p)) { | |
2641 | dev_err(DEV, "incompatible after-sb-2pri settings\n"); | |
2642 | goto disconnect; | |
2643 | } | |
2644 | ||
2645 | if (p_want_lose && mdev->net_conf->want_lose) { | |
2646 | dev_err(DEV, "both sides have the 'want_lose' flag set\n"); | |
2647 | goto disconnect; | |
2648 | } | |
2649 | ||
2650 | if (p_two_primaries != mdev->net_conf->two_primaries) { | |
2651 | dev_err(DEV, "incompatible setting of the two-primaries options\n"); | |
2652 | goto disconnect; | |
2653 | } | |
2654 | ||
2655 | if (mdev->agreed_pro_version >= 87) { | |
2656 | unsigned char *my_alg = mdev->net_conf->integrity_alg; | |
2657 | ||
2658 | if (drbd_recv(mdev, p_integrity_alg, data_size) != data_size) | |
2659 | return FALSE; | |
2660 | ||
2661 | p_integrity_alg[SHARED_SECRET_MAX-1] = 0; | |
2662 | if (strcmp(p_integrity_alg, my_alg)) { | |
2663 | dev_err(DEV, "incompatible setting of the data-integrity-alg\n"); | |
2664 | goto disconnect; | |
2665 | } | |
2666 | dev_info(DEV, "data-integrity-alg: %s\n", | |
2667 | my_alg[0] ? my_alg : (unsigned char *)"<not-used>"); | |
2668 | } | |
2669 | ||
2670 | return TRUE; | |
2671 | ||
2672 | disconnect: | |
2673 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
2674 | return FALSE; | |
2675 | } | |
2676 | ||
2677 | /* helper function | |
2678 | * input: alg name, feature name | |
2679 | * return: NULL (alg name was "") | |
2680 | * ERR_PTR(error) if something goes wrong | |
2681 | * or the crypto hash ptr, if it worked out ok. */ | |
2682 | struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev, | |
2683 | const char *alg, const char *name) | |
2684 | { | |
2685 | struct crypto_hash *tfm; | |
2686 | ||
2687 | if (!alg[0]) | |
2688 | return NULL; | |
2689 | ||
2690 | tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC); | |
2691 | if (IS_ERR(tfm)) { | |
2692 | dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n", | |
2693 | alg, name, PTR_ERR(tfm)); | |
2694 | return tfm; | |
2695 | } | |
2696 | if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) { | |
2697 | crypto_free_hash(tfm); | |
2698 | dev_err(DEV, "\"%s\" is not a digest (%s)\n", alg, name); | |
2699 | return ERR_PTR(-EINVAL); | |
2700 | } | |
2701 | return tfm; | |
2702 | } | |
2703 | ||
2704 | static int receive_SyncParam(struct drbd_conf *mdev, struct p_header *h) | |
2705 | { | |
2706 | int ok = TRUE; | |
2707 | struct p_rs_param_89 *p = (struct p_rs_param_89 *)h; | |
2708 | unsigned int header_size, data_size, exp_max_sz; | |
2709 | struct crypto_hash *verify_tfm = NULL; | |
2710 | struct crypto_hash *csums_tfm = NULL; | |
2711 | const int apv = mdev->agreed_pro_version; | |
2712 | ||
2713 | exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) | |
2714 | : apv == 88 ? sizeof(struct p_rs_param) | |
2715 | + SHARED_SECRET_MAX | |
2716 | : /* 89 */ sizeof(struct p_rs_param_89); | |
2717 | ||
2718 | if (h->length > exp_max_sz) { | |
2719 | dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n", | |
2720 | h->length, exp_max_sz); | |
2721 | return FALSE; | |
2722 | } | |
2723 | ||
2724 | if (apv <= 88) { | |
2725 | header_size = sizeof(struct p_rs_param) - sizeof(*h); | |
2726 | data_size = h->length - header_size; | |
2727 | } else /* apv >= 89 */ { | |
2728 | header_size = sizeof(struct p_rs_param_89) - sizeof(*h); | |
2729 | data_size = h->length - header_size; | |
2730 | D_ASSERT(data_size == 0); | |
2731 | } | |
2732 | ||
2733 | /* initialize verify_alg and csums_alg */ | |
2734 | memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); | |
2735 | ||
2736 | if (drbd_recv(mdev, h->payload, header_size) != header_size) | |
2737 | return FALSE; | |
2738 | ||
2739 | mdev->sync_conf.rate = be32_to_cpu(p->rate); | |
2740 | ||
2741 | if (apv >= 88) { | |
2742 | if (apv == 88) { | |
2743 | if (data_size > SHARED_SECRET_MAX) { | |
2744 | dev_err(DEV, "verify-alg too long, " | |
2745 | "peer wants %u, accepting only %u byte\n", | |
2746 | data_size, SHARED_SECRET_MAX); | |
2747 | return FALSE; | |
2748 | } | |
2749 | ||
2750 | if (drbd_recv(mdev, p->verify_alg, data_size) != data_size) | |
2751 | return FALSE; | |
2752 | ||
2753 | /* we expect NUL terminated string */ | |
2754 | /* but just in case someone tries to be evil */ | |
2755 | D_ASSERT(p->verify_alg[data_size-1] == 0); | |
2756 | p->verify_alg[data_size-1] = 0; | |
2757 | ||
2758 | } else /* apv >= 89 */ { | |
2759 | /* we still expect NUL terminated strings */ | |
2760 | /* but just in case someone tries to be evil */ | |
2761 | D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0); | |
2762 | D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0); | |
2763 | p->verify_alg[SHARED_SECRET_MAX-1] = 0; | |
2764 | p->csums_alg[SHARED_SECRET_MAX-1] = 0; | |
2765 | } | |
2766 | ||
2767 | if (strcmp(mdev->sync_conf.verify_alg, p->verify_alg)) { | |
2768 | if (mdev->state.conn == C_WF_REPORT_PARAMS) { | |
2769 | dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", | |
2770 | mdev->sync_conf.verify_alg, p->verify_alg); | |
2771 | goto disconnect; | |
2772 | } | |
2773 | verify_tfm = drbd_crypto_alloc_digest_safe(mdev, | |
2774 | p->verify_alg, "verify-alg"); | |
2775 | if (IS_ERR(verify_tfm)) { | |
2776 | verify_tfm = NULL; | |
2777 | goto disconnect; | |
2778 | } | |
2779 | } | |
2780 | ||
2781 | if (apv >= 89 && strcmp(mdev->sync_conf.csums_alg, p->csums_alg)) { | |
2782 | if (mdev->state.conn == C_WF_REPORT_PARAMS) { | |
2783 | dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", | |
2784 | mdev->sync_conf.csums_alg, p->csums_alg); | |
2785 | goto disconnect; | |
2786 | } | |
2787 | csums_tfm = drbd_crypto_alloc_digest_safe(mdev, | |
2788 | p->csums_alg, "csums-alg"); | |
2789 | if (IS_ERR(csums_tfm)) { | |
2790 | csums_tfm = NULL; | |
2791 | goto disconnect; | |
2792 | } | |
2793 | } | |
2794 | ||
2795 | ||
2796 | spin_lock(&mdev->peer_seq_lock); | |
2797 | /* lock against drbd_nl_syncer_conf() */ | |
2798 | if (verify_tfm) { | |
2799 | strcpy(mdev->sync_conf.verify_alg, p->verify_alg); | |
2800 | mdev->sync_conf.verify_alg_len = strlen(p->verify_alg) + 1; | |
2801 | crypto_free_hash(mdev->verify_tfm); | |
2802 | mdev->verify_tfm = verify_tfm; | |
2803 | dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg); | |
2804 | } | |
2805 | if (csums_tfm) { | |
2806 | strcpy(mdev->sync_conf.csums_alg, p->csums_alg); | |
2807 | mdev->sync_conf.csums_alg_len = strlen(p->csums_alg) + 1; | |
2808 | crypto_free_hash(mdev->csums_tfm); | |
2809 | mdev->csums_tfm = csums_tfm; | |
2810 | dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg); | |
2811 | } | |
2812 | spin_unlock(&mdev->peer_seq_lock); | |
2813 | } | |
2814 | ||
2815 | return ok; | |
2816 | disconnect: | |
2817 | /* just for completeness: actually not needed, | |
2818 | * as this is not reached if csums_tfm was ok. */ | |
2819 | crypto_free_hash(csums_tfm); | |
2820 | /* but free the verify_tfm again, if csums_tfm did not work out */ | |
2821 | crypto_free_hash(verify_tfm); | |
2822 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
2823 | return FALSE; | |
2824 | } | |
2825 | ||
2826 | static void drbd_setup_order_type(struct drbd_conf *mdev, int peer) | |
2827 | { | |
2828 | /* sorry, we currently have no working implementation | |
2829 | * of distributed TCQ */ | |
2830 | } | |
2831 | ||
2832 | /* warn if the arguments differ by more than 12.5% */ | |
2833 | static void warn_if_differ_considerably(struct drbd_conf *mdev, | |
2834 | const char *s, sector_t a, sector_t b) | |
2835 | { | |
2836 | sector_t d; | |
2837 | if (a == 0 || b == 0) | |
2838 | return; | |
2839 | d = (a > b) ? (a - b) : (b - a); | |
2840 | if (d > (a>>3) || d > (b>>3)) | |
2841 | dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s, | |
2842 | (unsigned long long)a, (unsigned long long)b); | |
2843 | } | |
2844 | ||
2845 | static int receive_sizes(struct drbd_conf *mdev, struct p_header *h) | |
2846 | { | |
2847 | struct p_sizes *p = (struct p_sizes *)h; | |
2848 | enum determine_dev_size dd = unchanged; | |
2849 | unsigned int max_seg_s; | |
2850 | sector_t p_size, p_usize, my_usize; | |
2851 | int ldsc = 0; /* local disk size changed */ | |
2852 | enum drbd_conns nconn; | |
2853 | ||
2854 | ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; | |
2855 | if (drbd_recv(mdev, h->payload, h->length) != h->length) | |
2856 | return FALSE; | |
2857 | ||
2858 | p_size = be64_to_cpu(p->d_size); | |
2859 | p_usize = be64_to_cpu(p->u_size); | |
2860 | ||
2861 | if (p_size == 0 && mdev->state.disk == D_DISKLESS) { | |
2862 | dev_err(DEV, "some backing storage is needed\n"); | |
2863 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
2864 | return FALSE; | |
2865 | } | |
2866 | ||
2867 | /* just store the peer's disk size for now. | |
2868 | * we still need to figure out whether we accept that. */ | |
2869 | mdev->p_size = p_size; | |
2870 | ||
2871 | #define min_not_zero(l, r) (l == 0) ? r : ((r == 0) ? l : min(l, r)) | |
2872 | if (get_ldev(mdev)) { | |
2873 | warn_if_differ_considerably(mdev, "lower level device sizes", | |
2874 | p_size, drbd_get_max_capacity(mdev->ldev)); | |
2875 | warn_if_differ_considerably(mdev, "user requested size", | |
2876 | p_usize, mdev->ldev->dc.disk_size); | |
2877 | ||
2878 | /* if this is the first connect, or an otherwise expected | |
2879 | * param exchange, choose the minimum */ | |
2880 | if (mdev->state.conn == C_WF_REPORT_PARAMS) | |
2881 | p_usize = min_not_zero((sector_t)mdev->ldev->dc.disk_size, | |
2882 | p_usize); | |
2883 | ||
2884 | my_usize = mdev->ldev->dc.disk_size; | |
2885 | ||
2886 | if (mdev->ldev->dc.disk_size != p_usize) { | |
2887 | mdev->ldev->dc.disk_size = p_usize; | |
2888 | dev_info(DEV, "Peer sets u_size to %lu sectors\n", | |
2889 | (unsigned long)mdev->ldev->dc.disk_size); | |
2890 | } | |
2891 | ||
2892 | /* Never shrink a device with usable data during connect. | |
2893 | But allow online shrinking if we are connected. */ | |
a393db6f | 2894 | if (drbd_new_dev_size(mdev, mdev->ldev, 0) < |
b411b363 PR |
2895 | drbd_get_capacity(mdev->this_bdev) && |
2896 | mdev->state.disk >= D_OUTDATED && | |
2897 | mdev->state.conn < C_CONNECTED) { | |
2898 | dev_err(DEV, "The peer's disk size is too small!\n"); | |
2899 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
2900 | mdev->ldev->dc.disk_size = my_usize; | |
2901 | put_ldev(mdev); | |
2902 | return FALSE; | |
2903 | } | |
2904 | put_ldev(mdev); | |
2905 | } | |
2906 | #undef min_not_zero | |
2907 | ||
2908 | if (get_ldev(mdev)) { | |
a393db6f | 2909 | dd = drbd_determin_dev_size(mdev, 0); |
b411b363 PR |
2910 | put_ldev(mdev); |
2911 | if (dd == dev_size_error) | |
2912 | return FALSE; | |
2913 | drbd_md_sync(mdev); | |
2914 | } else { | |
2915 | /* I am diskless, need to accept the peer's size. */ | |
2916 | drbd_set_my_capacity(mdev, p_size); | |
2917 | } | |
2918 | ||
2919 | if (mdev->p_uuid && mdev->state.conn <= C_CONNECTED && get_ldev(mdev)) { | |
2920 | nconn = drbd_sync_handshake(mdev, | |
2921 | mdev->state.peer, mdev->state.pdsk); | |
2922 | put_ldev(mdev); | |
2923 | ||
2924 | if (nconn == C_MASK) { | |
2925 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
2926 | return FALSE; | |
2927 | } | |
2928 | ||
2929 | if (drbd_request_state(mdev, NS(conn, nconn)) < SS_SUCCESS) { | |
2930 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
2931 | return FALSE; | |
2932 | } | |
2933 | } | |
2934 | ||
2935 | if (get_ldev(mdev)) { | |
2936 | if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { | |
2937 | mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); | |
2938 | ldsc = 1; | |
2939 | } | |
2940 | ||
2941 | max_seg_s = be32_to_cpu(p->max_segment_size); | |
2942 | if (max_seg_s != queue_max_segment_size(mdev->rq_queue)) | |
2943 | drbd_setup_queue_param(mdev, max_seg_s); | |
2944 | ||
2945 | drbd_setup_order_type(mdev, be32_to_cpu(p->queue_order_type)); | |
2946 | put_ldev(mdev); | |
2947 | } | |
2948 | ||
2949 | if (mdev->state.conn > C_WF_REPORT_PARAMS) { | |
2950 | if (be64_to_cpu(p->c_size) != | |
2951 | drbd_get_capacity(mdev->this_bdev) || ldsc) { | |
2952 | /* we have different sizes, probably peer | |
2953 | * needs to know my new size... */ | |
2954 | drbd_send_sizes(mdev, 0); | |
2955 | } | |
2956 | if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) || | |
2957 | (dd == grew && mdev->state.conn == C_CONNECTED)) { | |
2958 | if (mdev->state.pdsk >= D_INCONSISTENT && | |
2959 | mdev->state.disk >= D_INCONSISTENT) | |
2960 | resync_after_online_grow(mdev); | |
2961 | else | |
2962 | set_bit(RESYNC_AFTER_NEG, &mdev->flags); | |
2963 | } | |
2964 | } | |
2965 | ||
2966 | return TRUE; | |
2967 | } | |
2968 | ||
2969 | static int receive_uuids(struct drbd_conf *mdev, struct p_header *h) | |
2970 | { | |
2971 | struct p_uuids *p = (struct p_uuids *)h; | |
2972 | u64 *p_uuid; | |
2973 | int i; | |
2974 | ||
2975 | ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; | |
2976 | if (drbd_recv(mdev, h->payload, h->length) != h->length) | |
2977 | return FALSE; | |
2978 | ||
2979 | p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); | |
2980 | ||
2981 | for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) | |
2982 | p_uuid[i] = be64_to_cpu(p->uuid[i]); | |
2983 | ||
2984 | kfree(mdev->p_uuid); | |
2985 | mdev->p_uuid = p_uuid; | |
2986 | ||
2987 | if (mdev->state.conn < C_CONNECTED && | |
2988 | mdev->state.disk < D_INCONSISTENT && | |
2989 | mdev->state.role == R_PRIMARY && | |
2990 | (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { | |
2991 | dev_err(DEV, "Can only connect to data with current UUID=%016llX\n", | |
2992 | (unsigned long long)mdev->ed_uuid); | |
2993 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
2994 | return FALSE; | |
2995 | } | |
2996 | ||
2997 | if (get_ldev(mdev)) { | |
2998 | int skip_initial_sync = | |
2999 | mdev->state.conn == C_CONNECTED && | |
3000 | mdev->agreed_pro_version >= 90 && | |
3001 | mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && | |
3002 | (p_uuid[UI_FLAGS] & 8); | |
3003 | if (skip_initial_sync) { | |
3004 | dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n"); | |
3005 | drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, | |
3006 | "clear_n_write from receive_uuids"); | |
3007 | _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]); | |
3008 | _drbd_uuid_set(mdev, UI_BITMAP, 0); | |
3009 | _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), | |
3010 | CS_VERBOSE, NULL); | |
3011 | drbd_md_sync(mdev); | |
3012 | } | |
3013 | put_ldev(mdev); | |
3014 | } | |
3015 | ||
3016 | /* Before we test for the disk state, we should wait until an eventually | |
3017 | ongoing cluster wide state change is finished. That is important if | |
3018 | we are primary and are detaching from our disk. We need to see the | |
3019 | new disk state... */ | |
3020 | wait_event(mdev->misc_wait, !test_bit(CLUSTER_ST_CHANGE, &mdev->flags)); | |
3021 | if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT) | |
3022 | drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); | |
3023 | ||
3024 | return TRUE; | |
3025 | } | |
3026 | ||
3027 | /** | |
3028 | * convert_state() - Converts the peer's view of the cluster state to our point of view | |
3029 | * @ps: The state as seen by the peer. | |
3030 | */ | |
3031 | static union drbd_state convert_state(union drbd_state ps) | |
3032 | { | |
3033 | union drbd_state ms; | |
3034 | ||
3035 | static enum drbd_conns c_tab[] = { | |
3036 | [C_CONNECTED] = C_CONNECTED, | |
3037 | ||
3038 | [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, | |
3039 | [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, | |
3040 | [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ | |
3041 | [C_VERIFY_S] = C_VERIFY_T, | |
3042 | [C_MASK] = C_MASK, | |
3043 | }; | |
3044 | ||
3045 | ms.i = ps.i; | |
3046 | ||
3047 | ms.conn = c_tab[ps.conn]; | |
3048 | ms.peer = ps.role; | |
3049 | ms.role = ps.peer; | |
3050 | ms.pdsk = ps.disk; | |
3051 | ms.disk = ps.pdsk; | |
3052 | ms.peer_isp = (ps.aftr_isp | ps.user_isp); | |
3053 | ||
3054 | return ms; | |
3055 | } | |
3056 | ||
3057 | static int receive_req_state(struct drbd_conf *mdev, struct p_header *h) | |
3058 | { | |
3059 | struct p_req_state *p = (struct p_req_state *)h; | |
3060 | union drbd_state mask, val; | |
3061 | int rv; | |
3062 | ||
3063 | ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; | |
3064 | if (drbd_recv(mdev, h->payload, h->length) != h->length) | |
3065 | return FALSE; | |
3066 | ||
3067 | mask.i = be32_to_cpu(p->mask); | |
3068 | val.i = be32_to_cpu(p->val); | |
3069 | ||
3070 | if (test_bit(DISCARD_CONCURRENT, &mdev->flags) && | |
3071 | test_bit(CLUSTER_ST_CHANGE, &mdev->flags)) { | |
3072 | drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG); | |
3073 | return TRUE; | |
3074 | } | |
3075 | ||
3076 | mask = convert_state(mask); | |
3077 | val = convert_state(val); | |
3078 | ||
3079 | rv = drbd_change_state(mdev, CS_VERBOSE, mask, val); | |
3080 | ||
3081 | drbd_send_sr_reply(mdev, rv); | |
3082 | drbd_md_sync(mdev); | |
3083 | ||
3084 | return TRUE; | |
3085 | } | |
3086 | ||
3087 | static int receive_state(struct drbd_conf *mdev, struct p_header *h) | |
3088 | { | |
3089 | struct p_state *p = (struct p_state *)h; | |
3090 | enum drbd_conns nconn, oconn; | |
3091 | union drbd_state ns, peer_state; | |
3092 | enum drbd_disk_state real_peer_disk; | |
3093 | int rv; | |
3094 | ||
3095 | ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) | |
3096 | return FALSE; | |
3097 | ||
3098 | if (drbd_recv(mdev, h->payload, h->length) != h->length) | |
3099 | return FALSE; | |
3100 | ||
3101 | peer_state.i = be32_to_cpu(p->state); | |
3102 | ||
3103 | real_peer_disk = peer_state.disk; | |
3104 | if (peer_state.disk == D_NEGOTIATING) { | |
3105 | real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; | |
3106 | dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); | |
3107 | } | |
3108 | ||
3109 | spin_lock_irq(&mdev->req_lock); | |
3110 | retry: | |
3111 | oconn = nconn = mdev->state.conn; | |
3112 | spin_unlock_irq(&mdev->req_lock); | |
3113 | ||
3114 | if (nconn == C_WF_REPORT_PARAMS) | |
3115 | nconn = C_CONNECTED; | |
3116 | ||
3117 | if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING && | |
3118 | get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
3119 | int cr; /* consider resync */ | |
3120 | ||
3121 | /* if we established a new connection */ | |
3122 | cr = (oconn < C_CONNECTED); | |
3123 | /* if we had an established connection | |
3124 | * and one of the nodes newly attaches a disk */ | |
3125 | cr |= (oconn == C_CONNECTED && | |
3126 | (peer_state.disk == D_NEGOTIATING || | |
3127 | mdev->state.disk == D_NEGOTIATING)); | |
3128 | /* if we have both been inconsistent, and the peer has been | |
3129 | * forced to be UpToDate with --overwrite-data */ | |
3130 | cr |= test_bit(CONSIDER_RESYNC, &mdev->flags); | |
3131 | /* if we had been plain connected, and the admin requested to | |
3132 | * start a sync by "invalidate" or "invalidate-remote" */ | |
3133 | cr |= (oconn == C_CONNECTED && | |
3134 | (peer_state.conn >= C_STARTING_SYNC_S && | |
3135 | peer_state.conn <= C_WF_BITMAP_T)); | |
3136 | ||
3137 | if (cr) | |
3138 | nconn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk); | |
3139 | ||
3140 | put_ldev(mdev); | |
3141 | if (nconn == C_MASK) { | |
580b9767 | 3142 | nconn = C_CONNECTED; |
b411b363 PR |
3143 | if (mdev->state.disk == D_NEGOTIATING) { |
3144 | drbd_force_state(mdev, NS(disk, D_DISKLESS)); | |
b411b363 PR |
3145 | } else if (peer_state.disk == D_NEGOTIATING) { |
3146 | dev_err(DEV, "Disk attach process on the peer node was aborted.\n"); | |
3147 | peer_state.disk = D_DISKLESS; | |
580b9767 | 3148 | real_peer_disk = D_DISKLESS; |
b411b363 | 3149 | } else { |
cf14c2e9 PR |
3150 | if (test_and_clear_bit(CONN_DRY_RUN, &mdev->flags)) |
3151 | return FALSE; | |
b411b363 PR |
3152 | D_ASSERT(oconn == C_WF_REPORT_PARAMS); |
3153 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
3154 | return FALSE; | |
3155 | } | |
3156 | } | |
3157 | } | |
3158 | ||
3159 | spin_lock_irq(&mdev->req_lock); | |
3160 | if (mdev->state.conn != oconn) | |
3161 | goto retry; | |
3162 | clear_bit(CONSIDER_RESYNC, &mdev->flags); | |
3163 | ns.i = mdev->state.i; | |
3164 | ns.conn = nconn; | |
3165 | ns.peer = peer_state.role; | |
3166 | ns.pdsk = real_peer_disk; | |
3167 | ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); | |
3168 | if ((nconn == C_CONNECTED || nconn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) | |
3169 | ns.disk = mdev->new_state_tmp.disk; | |
3170 | ||
3171 | rv = _drbd_set_state(mdev, ns, CS_VERBOSE | CS_HARD, NULL); | |
3172 | ns = mdev->state; | |
3173 | spin_unlock_irq(&mdev->req_lock); | |
3174 | ||
3175 | if (rv < SS_SUCCESS) { | |
3176 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
3177 | return FALSE; | |
3178 | } | |
3179 | ||
3180 | if (oconn > C_WF_REPORT_PARAMS) { | |
3181 | if (nconn > C_CONNECTED && peer_state.conn <= C_CONNECTED && | |
3182 | peer_state.disk != D_NEGOTIATING ) { | |
3183 | /* we want resync, peer has not yet decided to sync... */ | |
3184 | /* Nowadays only used when forcing a node into primary role and | |
3185 | setting its disk to UpToDate with that */ | |
3186 | drbd_send_uuids(mdev); | |
3187 | drbd_send_state(mdev); | |
3188 | } | |
3189 | } | |
3190 | ||
3191 | mdev->net_conf->want_lose = 0; | |
3192 | ||
3193 | drbd_md_sync(mdev); /* update connected indicator, la_size, ... */ | |
3194 | ||
3195 | return TRUE; | |
3196 | } | |
3197 | ||
3198 | static int receive_sync_uuid(struct drbd_conf *mdev, struct p_header *h) | |
3199 | { | |
3200 | struct p_rs_uuid *p = (struct p_rs_uuid *)h; | |
3201 | ||
3202 | wait_event(mdev->misc_wait, | |
3203 | mdev->state.conn == C_WF_SYNC_UUID || | |
3204 | mdev->state.conn < C_CONNECTED || | |
3205 | mdev->state.disk < D_NEGOTIATING); | |
3206 | ||
3207 | /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */ | |
3208 | ||
3209 | ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; | |
3210 | if (drbd_recv(mdev, h->payload, h->length) != h->length) | |
3211 | return FALSE; | |
3212 | ||
3213 | /* Here the _drbd_uuid_ functions are right, current should | |
3214 | _not_ be rotated into the history */ | |
3215 | if (get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
3216 | _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid)); | |
3217 | _drbd_uuid_set(mdev, UI_BITMAP, 0UL); | |
3218 | ||
3219 | drbd_start_resync(mdev, C_SYNC_TARGET); | |
3220 | ||
3221 | put_ldev(mdev); | |
3222 | } else | |
3223 | dev_err(DEV, "Ignoring SyncUUID packet!\n"); | |
3224 | ||
3225 | return TRUE; | |
3226 | } | |
3227 | ||
3228 | enum receive_bitmap_ret { OK, DONE, FAILED }; | |
3229 | ||
3230 | static enum receive_bitmap_ret | |
3231 | receive_bitmap_plain(struct drbd_conf *mdev, struct p_header *h, | |
3232 | unsigned long *buffer, struct bm_xfer_ctx *c) | |
3233 | { | |
3234 | unsigned num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset); | |
3235 | unsigned want = num_words * sizeof(long); | |
3236 | ||
3237 | if (want != h->length) { | |
3238 | dev_err(DEV, "%s:want (%u) != h->length (%u)\n", __func__, want, h->length); | |
3239 | return FAILED; | |
3240 | } | |
3241 | if (want == 0) | |
3242 | return DONE; | |
3243 | if (drbd_recv(mdev, buffer, want) != want) | |
3244 | return FAILED; | |
3245 | ||
3246 | drbd_bm_merge_lel(mdev, c->word_offset, num_words, buffer); | |
3247 | ||
3248 | c->word_offset += num_words; | |
3249 | c->bit_offset = c->word_offset * BITS_PER_LONG; | |
3250 | if (c->bit_offset > c->bm_bits) | |
3251 | c->bit_offset = c->bm_bits; | |
3252 | ||
3253 | return OK; | |
3254 | } | |
3255 | ||
3256 | static enum receive_bitmap_ret | |
3257 | recv_bm_rle_bits(struct drbd_conf *mdev, | |
3258 | struct p_compressed_bm *p, | |
3259 | struct bm_xfer_ctx *c) | |
3260 | { | |
3261 | struct bitstream bs; | |
3262 | u64 look_ahead; | |
3263 | u64 rl; | |
3264 | u64 tmp; | |
3265 | unsigned long s = c->bit_offset; | |
3266 | unsigned long e; | |
3267 | int len = p->head.length - (sizeof(*p) - sizeof(p->head)); | |
3268 | int toggle = DCBP_get_start(p); | |
3269 | int have; | |
3270 | int bits; | |
3271 | ||
3272 | bitstream_init(&bs, p->code, len, DCBP_get_pad_bits(p)); | |
3273 | ||
3274 | bits = bitstream_get_bits(&bs, &look_ahead, 64); | |
3275 | if (bits < 0) | |
3276 | return FAILED; | |
3277 | ||
3278 | for (have = bits; have > 0; s += rl, toggle = !toggle) { | |
3279 | bits = vli_decode_bits(&rl, look_ahead); | |
3280 | if (bits <= 0) | |
3281 | return FAILED; | |
3282 | ||
3283 | if (toggle) { | |
3284 | e = s + rl -1; | |
3285 | if (e >= c->bm_bits) { | |
3286 | dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); | |
3287 | return FAILED; | |
3288 | } | |
3289 | _drbd_bm_set_bits(mdev, s, e); | |
3290 | } | |
3291 | ||
3292 | if (have < bits) { | |
3293 | dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", | |
3294 | have, bits, look_ahead, | |
3295 | (unsigned int)(bs.cur.b - p->code), | |
3296 | (unsigned int)bs.buf_len); | |
3297 | return FAILED; | |
3298 | } | |
3299 | look_ahead >>= bits; | |
3300 | have -= bits; | |
3301 | ||
3302 | bits = bitstream_get_bits(&bs, &tmp, 64 - have); | |
3303 | if (bits < 0) | |
3304 | return FAILED; | |
3305 | look_ahead |= tmp << have; | |
3306 | have += bits; | |
3307 | } | |
3308 | ||
3309 | c->bit_offset = s; | |
3310 | bm_xfer_ctx_bit_to_word_offset(c); | |
3311 | ||
3312 | return (s == c->bm_bits) ? DONE : OK; | |
3313 | } | |
3314 | ||
3315 | static enum receive_bitmap_ret | |
3316 | decode_bitmap_c(struct drbd_conf *mdev, | |
3317 | struct p_compressed_bm *p, | |
3318 | struct bm_xfer_ctx *c) | |
3319 | { | |
3320 | if (DCBP_get_code(p) == RLE_VLI_Bits) | |
3321 | return recv_bm_rle_bits(mdev, p, c); | |
3322 | ||
3323 | /* other variants had been implemented for evaluation, | |
3324 | * but have been dropped as this one turned out to be "best" | |
3325 | * during all our tests. */ | |
3326 | ||
3327 | dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding); | |
3328 | drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); | |
3329 | return FAILED; | |
3330 | } | |
3331 | ||
3332 | void INFO_bm_xfer_stats(struct drbd_conf *mdev, | |
3333 | const char *direction, struct bm_xfer_ctx *c) | |
3334 | { | |
3335 | /* what would it take to transfer it "plaintext" */ | |
3336 | unsigned plain = sizeof(struct p_header) * | |
3337 | ((c->bm_words+BM_PACKET_WORDS-1)/BM_PACKET_WORDS+1) | |
3338 | + c->bm_words * sizeof(long); | |
3339 | unsigned total = c->bytes[0] + c->bytes[1]; | |
3340 | unsigned r; | |
3341 | ||
3342 | /* total can not be zero. but just in case: */ | |
3343 | if (total == 0) | |
3344 | return; | |
3345 | ||
3346 | /* don't report if not compressed */ | |
3347 | if (total >= plain) | |
3348 | return; | |
3349 | ||
3350 | /* total < plain. check for overflow, still */ | |
3351 | r = (total > UINT_MAX/1000) ? (total / (plain/1000)) | |
3352 | : (1000 * total / plain); | |
3353 | ||
3354 | if (r > 1000) | |
3355 | r = 1000; | |
3356 | ||
3357 | r = 1000 - r; | |
3358 | dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " | |
3359 | "total %u; compression: %u.%u%%\n", | |
3360 | direction, | |
3361 | c->bytes[1], c->packets[1], | |
3362 | c->bytes[0], c->packets[0], | |
3363 | total, r/10, r % 10); | |
3364 | } | |
3365 | ||
3366 | /* Since we are processing the bitfield from lower addresses to higher, | |
3367 | it does not matter if the process it in 32 bit chunks or 64 bit | |
3368 | chunks as long as it is little endian. (Understand it as byte stream, | |
3369 | beginning with the lowest byte...) If we would use big endian | |
3370 | we would need to process it from the highest address to the lowest, | |
3371 | in order to be agnostic to the 32 vs 64 bits issue. | |
3372 | ||
3373 | returns 0 on failure, 1 if we successfully received it. */ | |
3374 | static int receive_bitmap(struct drbd_conf *mdev, struct p_header *h) | |
3375 | { | |
3376 | struct bm_xfer_ctx c; | |
3377 | void *buffer; | |
3378 | enum receive_bitmap_ret ret; | |
3379 | int ok = FALSE; | |
3380 | ||
3381 | wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt)); | |
3382 | ||
3383 | drbd_bm_lock(mdev, "receive bitmap"); | |
3384 | ||
3385 | /* maybe we should use some per thread scratch page, | |
3386 | * and allocate that during initial device creation? */ | |
3387 | buffer = (unsigned long *) __get_free_page(GFP_NOIO); | |
3388 | if (!buffer) { | |
3389 | dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__); | |
3390 | goto out; | |
3391 | } | |
3392 | ||
3393 | c = (struct bm_xfer_ctx) { | |
3394 | .bm_bits = drbd_bm_bits(mdev), | |
3395 | .bm_words = drbd_bm_words(mdev), | |
3396 | }; | |
3397 | ||
3398 | do { | |
3399 | if (h->command == P_BITMAP) { | |
3400 | ret = receive_bitmap_plain(mdev, h, buffer, &c); | |
3401 | } else if (h->command == P_COMPRESSED_BITMAP) { | |
3402 | /* MAYBE: sanity check that we speak proto >= 90, | |
3403 | * and the feature is enabled! */ | |
3404 | struct p_compressed_bm *p; | |
3405 | ||
3406 | if (h->length > BM_PACKET_PAYLOAD_BYTES) { | |
3407 | dev_err(DEV, "ReportCBitmap packet too large\n"); | |
3408 | goto out; | |
3409 | } | |
3410 | /* use the page buff */ | |
3411 | p = buffer; | |
3412 | memcpy(p, h, sizeof(*h)); | |
3413 | if (drbd_recv(mdev, p->head.payload, h->length) != h->length) | |
3414 | goto out; | |
3415 | if (p->head.length <= (sizeof(*p) - sizeof(p->head))) { | |
3416 | dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", p->head.length); | |
3417 | return FAILED; | |
3418 | } | |
3419 | ret = decode_bitmap_c(mdev, p, &c); | |
3420 | } else { | |
3421 | dev_warn(DEV, "receive_bitmap: h->command neither ReportBitMap nor ReportCBitMap (is 0x%x)", h->command); | |
3422 | goto out; | |
3423 | } | |
3424 | ||
3425 | c.packets[h->command == P_BITMAP]++; | |
3426 | c.bytes[h->command == P_BITMAP] += sizeof(struct p_header) + h->length; | |
3427 | ||
3428 | if (ret != OK) | |
3429 | break; | |
3430 | ||
3431 | if (!drbd_recv_header(mdev, h)) | |
3432 | goto out; | |
3433 | } while (ret == OK); | |
3434 | if (ret == FAILED) | |
3435 | goto out; | |
3436 | ||
3437 | INFO_bm_xfer_stats(mdev, "receive", &c); | |
3438 | ||
3439 | if (mdev->state.conn == C_WF_BITMAP_T) { | |
3440 | ok = !drbd_send_bitmap(mdev); | |
3441 | if (!ok) | |
3442 | goto out; | |
3443 | /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ | |
3444 | ok = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); | |
3445 | D_ASSERT(ok == SS_SUCCESS); | |
3446 | } else if (mdev->state.conn != C_WF_BITMAP_S) { | |
3447 | /* admin may have requested C_DISCONNECTING, | |
3448 | * other threads may have noticed network errors */ | |
3449 | dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n", | |
3450 | drbd_conn_str(mdev->state.conn)); | |
3451 | } | |
3452 | ||
3453 | ok = TRUE; | |
3454 | out: | |
3455 | drbd_bm_unlock(mdev); | |
3456 | if (ok && mdev->state.conn == C_WF_BITMAP_S) | |
3457 | drbd_start_resync(mdev, C_SYNC_SOURCE); | |
3458 | free_page((unsigned long) buffer); | |
3459 | return ok; | |
3460 | } | |
3461 | ||
3462 | static int receive_skip(struct drbd_conf *mdev, struct p_header *h) | |
3463 | { | |
3464 | /* TODO zero copy sink :) */ | |
3465 | static char sink[128]; | |
3466 | int size, want, r; | |
3467 | ||
3468 | dev_warn(DEV, "skipping unknown optional packet type %d, l: %d!\n", | |
3469 | h->command, h->length); | |
3470 | ||
3471 | size = h->length; | |
3472 | while (size > 0) { | |
3473 | want = min_t(int, size, sizeof(sink)); | |
3474 | r = drbd_recv(mdev, sink, want); | |
3475 | ERR_IF(r <= 0) break; | |
3476 | size -= r; | |
3477 | } | |
3478 | return size == 0; | |
3479 | } | |
3480 | ||
3481 | static int receive_UnplugRemote(struct drbd_conf *mdev, struct p_header *h) | |
3482 | { | |
3483 | if (mdev->state.disk >= D_INCONSISTENT) | |
3484 | drbd_kick_lo(mdev); | |
3485 | ||
3486 | /* Make sure we've acked all the TCP data associated | |
3487 | * with the data requests being unplugged */ | |
3488 | drbd_tcp_quickack(mdev->data.socket); | |
3489 | ||
3490 | return TRUE; | |
3491 | } | |
3492 | ||
3493 | typedef int (*drbd_cmd_handler_f)(struct drbd_conf *, struct p_header *); | |
3494 | ||
3495 | static drbd_cmd_handler_f drbd_default_handler[] = { | |
3496 | [P_DATA] = receive_Data, | |
3497 | [P_DATA_REPLY] = receive_DataReply, | |
3498 | [P_RS_DATA_REPLY] = receive_RSDataReply, | |
3499 | [P_BARRIER] = receive_Barrier, | |
3500 | [P_BITMAP] = receive_bitmap, | |
3501 | [P_COMPRESSED_BITMAP] = receive_bitmap, | |
3502 | [P_UNPLUG_REMOTE] = receive_UnplugRemote, | |
3503 | [P_DATA_REQUEST] = receive_DataRequest, | |
3504 | [P_RS_DATA_REQUEST] = receive_DataRequest, | |
3505 | [P_SYNC_PARAM] = receive_SyncParam, | |
3506 | [P_SYNC_PARAM89] = receive_SyncParam, | |
3507 | [P_PROTOCOL] = receive_protocol, | |
3508 | [P_UUIDS] = receive_uuids, | |
3509 | [P_SIZES] = receive_sizes, | |
3510 | [P_STATE] = receive_state, | |
3511 | [P_STATE_CHG_REQ] = receive_req_state, | |
3512 | [P_SYNC_UUID] = receive_sync_uuid, | |
3513 | [P_OV_REQUEST] = receive_DataRequest, | |
3514 | [P_OV_REPLY] = receive_DataRequest, | |
3515 | [P_CSUM_RS_REQUEST] = receive_DataRequest, | |
3516 | /* anything missing from this table is in | |
3517 | * the asender_tbl, see get_asender_cmd */ | |
3518 | [P_MAX_CMD] = NULL, | |
3519 | }; | |
3520 | ||
3521 | static drbd_cmd_handler_f *drbd_cmd_handler = drbd_default_handler; | |
3522 | static drbd_cmd_handler_f *drbd_opt_cmd_handler; | |
3523 | ||
3524 | static void drbdd(struct drbd_conf *mdev) | |
3525 | { | |
3526 | drbd_cmd_handler_f handler; | |
3527 | struct p_header *header = &mdev->data.rbuf.header; | |
3528 | ||
3529 | while (get_t_state(&mdev->receiver) == Running) { | |
3530 | drbd_thread_current_set_cpu(mdev); | |
0b33a916 LE |
3531 | if (!drbd_recv_header(mdev, header)) { |
3532 | drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); | |
b411b363 | 3533 | break; |
0b33a916 | 3534 | } |
b411b363 PR |
3535 | |
3536 | if (header->command < P_MAX_CMD) | |
3537 | handler = drbd_cmd_handler[header->command]; | |
3538 | else if (P_MAY_IGNORE < header->command | |
3539 | && header->command < P_MAX_OPT_CMD) | |
3540 | handler = drbd_opt_cmd_handler[header->command-P_MAY_IGNORE]; | |
3541 | else if (header->command > P_MAX_OPT_CMD) | |
3542 | handler = receive_skip; | |
3543 | else | |
3544 | handler = NULL; | |
3545 | ||
3546 | if (unlikely(!handler)) { | |
3547 | dev_err(DEV, "unknown packet type %d, l: %d!\n", | |
3548 | header->command, header->length); | |
3549 | drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); | |
3550 | break; | |
3551 | } | |
3552 | if (unlikely(!handler(mdev, header))) { | |
3553 | dev_err(DEV, "error receiving %s, l: %d!\n", | |
3554 | cmdname(header->command), header->length); | |
3555 | drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); | |
3556 | break; | |
3557 | } | |
b411b363 PR |
3558 | } |
3559 | } | |
3560 | ||
3561 | static void drbd_fail_pending_reads(struct drbd_conf *mdev) | |
3562 | { | |
3563 | struct hlist_head *slot; | |
3564 | struct hlist_node *pos; | |
3565 | struct hlist_node *tmp; | |
3566 | struct drbd_request *req; | |
3567 | int i; | |
3568 | ||
3569 | /* | |
3570 | * Application READ requests | |
3571 | */ | |
3572 | spin_lock_irq(&mdev->req_lock); | |
3573 | for (i = 0; i < APP_R_HSIZE; i++) { | |
3574 | slot = mdev->app_reads_hash+i; | |
3575 | hlist_for_each_entry_safe(req, pos, tmp, slot, colision) { | |
3576 | /* it may (but should not any longer!) | |
3577 | * be on the work queue; if that assert triggers, | |
3578 | * we need to also grab the | |
3579 | * spin_lock_irq(&mdev->data.work.q_lock); | |
3580 | * and list_del_init here. */ | |
3581 | D_ASSERT(list_empty(&req->w.list)); | |
3582 | /* It would be nice to complete outside of spinlock. | |
3583 | * But this is easier for now. */ | |
3584 | _req_mod(req, connection_lost_while_pending); | |
3585 | } | |
3586 | } | |
3587 | for (i = 0; i < APP_R_HSIZE; i++) | |
3588 | if (!hlist_empty(mdev->app_reads_hash+i)) | |
3589 | dev_warn(DEV, "ASSERT FAILED: app_reads_hash[%d].first: " | |
3590 | "%p, should be NULL\n", i, mdev->app_reads_hash[i].first); | |
3591 | ||
3592 | memset(mdev->app_reads_hash, 0, APP_R_HSIZE*sizeof(void *)); | |
3593 | spin_unlock_irq(&mdev->req_lock); | |
3594 | } | |
3595 | ||
3596 | void drbd_flush_workqueue(struct drbd_conf *mdev) | |
3597 | { | |
3598 | struct drbd_wq_barrier barr; | |
3599 | ||
3600 | barr.w.cb = w_prev_work_done; | |
3601 | init_completion(&barr.done); | |
3602 | drbd_queue_work(&mdev->data.work, &barr.w); | |
3603 | wait_for_completion(&barr.done); | |
3604 | } | |
3605 | ||
3606 | static void drbd_disconnect(struct drbd_conf *mdev) | |
3607 | { | |
3608 | enum drbd_fencing_p fp; | |
3609 | union drbd_state os, ns; | |
3610 | int rv = SS_UNKNOWN_ERROR; | |
3611 | unsigned int i; | |
3612 | ||
3613 | if (mdev->state.conn == C_STANDALONE) | |
3614 | return; | |
3615 | if (mdev->state.conn >= C_WF_CONNECTION) | |
3616 | dev_err(DEV, "ASSERT FAILED cstate = %s, expected < WFConnection\n", | |
3617 | drbd_conn_str(mdev->state.conn)); | |
3618 | ||
3619 | /* asender does not clean up anything. it must not interfere, either */ | |
3620 | drbd_thread_stop(&mdev->asender); | |
b411b363 | 3621 | drbd_free_sock(mdev); |
b411b363 PR |
3622 | |
3623 | spin_lock_irq(&mdev->req_lock); | |
3624 | _drbd_wait_ee_list_empty(mdev, &mdev->active_ee); | |
3625 | _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee); | |
3626 | _drbd_wait_ee_list_empty(mdev, &mdev->read_ee); | |
3627 | spin_unlock_irq(&mdev->req_lock); | |
3628 | ||
3629 | /* We do not have data structures that would allow us to | |
3630 | * get the rs_pending_cnt down to 0 again. | |
3631 | * * On C_SYNC_TARGET we do not have any data structures describing | |
3632 | * the pending RSDataRequest's we have sent. | |
3633 | * * On C_SYNC_SOURCE there is no data structure that tracks | |
3634 | * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. | |
3635 | * And no, it is not the sum of the reference counts in the | |
3636 | * resync_LRU. The resync_LRU tracks the whole operation including | |
3637 | * the disk-IO, while the rs_pending_cnt only tracks the blocks | |
3638 | * on the fly. */ | |
3639 | drbd_rs_cancel_all(mdev); | |
3640 | mdev->rs_total = 0; | |
3641 | mdev->rs_failed = 0; | |
3642 | atomic_set(&mdev->rs_pending_cnt, 0); | |
3643 | wake_up(&mdev->misc_wait); | |
3644 | ||
3645 | /* make sure syncer is stopped and w_resume_next_sg queued */ | |
3646 | del_timer_sync(&mdev->resync_timer); | |
3647 | set_bit(STOP_SYNC_TIMER, &mdev->flags); | |
3648 | resync_timer_fn((unsigned long)mdev); | |
3649 | ||
b411b363 PR |
3650 | /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, |
3651 | * w_make_resync_request etc. which may still be on the worker queue | |
3652 | * to be "canceled" */ | |
3653 | drbd_flush_workqueue(mdev); | |
3654 | ||
3655 | /* This also does reclaim_net_ee(). If we do this too early, we might | |
3656 | * miss some resync ee and pages.*/ | |
3657 | drbd_process_done_ee(mdev); | |
3658 | ||
3659 | kfree(mdev->p_uuid); | |
3660 | mdev->p_uuid = NULL; | |
3661 | ||
3662 | if (!mdev->state.susp) | |
3663 | tl_clear(mdev); | |
3664 | ||
3665 | drbd_fail_pending_reads(mdev); | |
3666 | ||
3667 | dev_info(DEV, "Connection closed\n"); | |
3668 | ||
3669 | drbd_md_sync(mdev); | |
3670 | ||
3671 | fp = FP_DONT_CARE; | |
3672 | if (get_ldev(mdev)) { | |
3673 | fp = mdev->ldev->dc.fencing; | |
3674 | put_ldev(mdev); | |
3675 | } | |
3676 | ||
3677 | if (mdev->state.role == R_PRIMARY) { | |
3678 | if (fp >= FP_RESOURCE && mdev->state.pdsk >= D_UNKNOWN) { | |
3679 | enum drbd_disk_state nps = drbd_try_outdate_peer(mdev); | |
3680 | drbd_request_state(mdev, NS(pdsk, nps)); | |
3681 | } | |
3682 | } | |
3683 | ||
3684 | spin_lock_irq(&mdev->req_lock); | |
3685 | os = mdev->state; | |
3686 | if (os.conn >= C_UNCONNECTED) { | |
3687 | /* Do not restart in case we are C_DISCONNECTING */ | |
3688 | ns = os; | |
3689 | ns.conn = C_UNCONNECTED; | |
3690 | rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); | |
3691 | } | |
3692 | spin_unlock_irq(&mdev->req_lock); | |
3693 | ||
3694 | if (os.conn == C_DISCONNECTING) { | |
3695 | struct hlist_head *h; | |
3696 | wait_event(mdev->misc_wait, atomic_read(&mdev->net_cnt) == 0); | |
3697 | ||
3698 | /* we must not free the tl_hash | |
3699 | * while application io is still on the fly */ | |
3700 | wait_event(mdev->misc_wait, atomic_read(&mdev->ap_bio_cnt) == 0); | |
3701 | ||
3702 | spin_lock_irq(&mdev->req_lock); | |
3703 | /* paranoia code */ | |
3704 | for (h = mdev->ee_hash; h < mdev->ee_hash + mdev->ee_hash_s; h++) | |
3705 | if (h->first) | |
3706 | dev_err(DEV, "ASSERT FAILED ee_hash[%u].first == %p, expected NULL\n", | |
3707 | (int)(h - mdev->ee_hash), h->first); | |
3708 | kfree(mdev->ee_hash); | |
3709 | mdev->ee_hash = NULL; | |
3710 | mdev->ee_hash_s = 0; | |
3711 | ||
3712 | /* paranoia code */ | |
3713 | for (h = mdev->tl_hash; h < mdev->tl_hash + mdev->tl_hash_s; h++) | |
3714 | if (h->first) | |
3715 | dev_err(DEV, "ASSERT FAILED tl_hash[%u] == %p, expected NULL\n", | |
3716 | (int)(h - mdev->tl_hash), h->first); | |
3717 | kfree(mdev->tl_hash); | |
3718 | mdev->tl_hash = NULL; | |
3719 | mdev->tl_hash_s = 0; | |
3720 | spin_unlock_irq(&mdev->req_lock); | |
3721 | ||
3722 | crypto_free_hash(mdev->cram_hmac_tfm); | |
3723 | mdev->cram_hmac_tfm = NULL; | |
3724 | ||
3725 | kfree(mdev->net_conf); | |
3726 | mdev->net_conf = NULL; | |
3727 | drbd_request_state(mdev, NS(conn, C_STANDALONE)); | |
3728 | } | |
3729 | ||
3730 | /* tcp_close and release of sendpage pages can be deferred. I don't | |
3731 | * want to use SO_LINGER, because apparently it can be deferred for | |
3732 | * more than 20 seconds (longest time I checked). | |
3733 | * | |
3734 | * Actually we don't care for exactly when the network stack does its | |
3735 | * put_page(), but release our reference on these pages right here. | |
3736 | */ | |
3737 | i = drbd_release_ee(mdev, &mdev->net_ee); | |
3738 | if (i) | |
3739 | dev_info(DEV, "net_ee not empty, killed %u entries\n", i); | |
3740 | i = atomic_read(&mdev->pp_in_use); | |
3741 | if (i) | |
3742 | dev_info(DEV, "pp_in_use = %u, expected 0\n", i); | |
3743 | ||
3744 | D_ASSERT(list_empty(&mdev->read_ee)); | |
3745 | D_ASSERT(list_empty(&mdev->active_ee)); | |
3746 | D_ASSERT(list_empty(&mdev->sync_ee)); | |
3747 | D_ASSERT(list_empty(&mdev->done_ee)); | |
3748 | ||
3749 | /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ | |
3750 | atomic_set(&mdev->current_epoch->epoch_size, 0); | |
3751 | D_ASSERT(list_empty(&mdev->current_epoch->list)); | |
3752 | } | |
3753 | ||
3754 | /* | |
3755 | * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version | |
3756 | * we can agree on is stored in agreed_pro_version. | |
3757 | * | |
3758 | * feature flags and the reserved array should be enough room for future | |
3759 | * enhancements of the handshake protocol, and possible plugins... | |
3760 | * | |
3761 | * for now, they are expected to be zero, but ignored. | |
3762 | */ | |
3763 | static int drbd_send_handshake(struct drbd_conf *mdev) | |
3764 | { | |
3765 | /* ASSERT current == mdev->receiver ... */ | |
3766 | struct p_handshake *p = &mdev->data.sbuf.handshake; | |
3767 | int ok; | |
3768 | ||
3769 | if (mutex_lock_interruptible(&mdev->data.mutex)) { | |
3770 | dev_err(DEV, "interrupted during initial handshake\n"); | |
3771 | return 0; /* interrupted. not ok. */ | |
3772 | } | |
3773 | ||
3774 | if (mdev->data.socket == NULL) { | |
3775 | mutex_unlock(&mdev->data.mutex); | |
3776 | return 0; | |
3777 | } | |
3778 | ||
3779 | memset(p, 0, sizeof(*p)); | |
3780 | p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); | |
3781 | p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); | |
3782 | ok = _drbd_send_cmd( mdev, mdev->data.socket, P_HAND_SHAKE, | |
3783 | (struct p_header *)p, sizeof(*p), 0 ); | |
3784 | mutex_unlock(&mdev->data.mutex); | |
3785 | return ok; | |
3786 | } | |
3787 | ||
3788 | /* | |
3789 | * return values: | |
3790 | * 1 yes, we have a valid connection | |
3791 | * 0 oops, did not work out, please try again | |
3792 | * -1 peer talks different language, | |
3793 | * no point in trying again, please go standalone. | |
3794 | */ | |
3795 | static int drbd_do_handshake(struct drbd_conf *mdev) | |
3796 | { | |
3797 | /* ASSERT current == mdev->receiver ... */ | |
3798 | struct p_handshake *p = &mdev->data.rbuf.handshake; | |
3799 | const int expect = sizeof(struct p_handshake) | |
3800 | -sizeof(struct p_header); | |
3801 | int rv; | |
3802 | ||
3803 | rv = drbd_send_handshake(mdev); | |
3804 | if (!rv) | |
3805 | return 0; | |
3806 | ||
3807 | rv = drbd_recv_header(mdev, &p->head); | |
3808 | if (!rv) | |
3809 | return 0; | |
3810 | ||
3811 | if (p->head.command != P_HAND_SHAKE) { | |
3812 | dev_err(DEV, "expected HandShake packet, received: %s (0x%04x)\n", | |
3813 | cmdname(p->head.command), p->head.command); | |
3814 | return -1; | |
3815 | } | |
3816 | ||
3817 | if (p->head.length != expect) { | |
3818 | dev_err(DEV, "expected HandShake length: %u, received: %u\n", | |
3819 | expect, p->head.length); | |
3820 | return -1; | |
3821 | } | |
3822 | ||
3823 | rv = drbd_recv(mdev, &p->head.payload, expect); | |
3824 | ||
3825 | if (rv != expect) { | |
3826 | dev_err(DEV, "short read receiving handshake packet: l=%u\n", rv); | |
3827 | return 0; | |
3828 | } | |
3829 | ||
b411b363 PR |
3830 | p->protocol_min = be32_to_cpu(p->protocol_min); |
3831 | p->protocol_max = be32_to_cpu(p->protocol_max); | |
3832 | if (p->protocol_max == 0) | |
3833 | p->protocol_max = p->protocol_min; | |
3834 | ||
3835 | if (PRO_VERSION_MAX < p->protocol_min || | |
3836 | PRO_VERSION_MIN > p->protocol_max) | |
3837 | goto incompat; | |
3838 | ||
3839 | mdev->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); | |
3840 | ||
3841 | dev_info(DEV, "Handshake successful: " | |
3842 | "Agreed network protocol version %d\n", mdev->agreed_pro_version); | |
3843 | ||
3844 | return 1; | |
3845 | ||
3846 | incompat: | |
3847 | dev_err(DEV, "incompatible DRBD dialects: " | |
3848 | "I support %d-%d, peer supports %d-%d\n", | |
3849 | PRO_VERSION_MIN, PRO_VERSION_MAX, | |
3850 | p->protocol_min, p->protocol_max); | |
3851 | return -1; | |
3852 | } | |
3853 | ||
3854 | #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) | |
3855 | static int drbd_do_auth(struct drbd_conf *mdev) | |
3856 | { | |
3857 | dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); | |
3858 | dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); | |
b10d96cb | 3859 | return -1; |
b411b363 PR |
3860 | } |
3861 | #else | |
3862 | #define CHALLENGE_LEN 64 | |
b10d96cb JT |
3863 | |
3864 | /* Return value: | |
3865 | 1 - auth succeeded, | |
3866 | 0 - failed, try again (network error), | |
3867 | -1 - auth failed, don't try again. | |
3868 | */ | |
3869 | ||
b411b363 PR |
3870 | static int drbd_do_auth(struct drbd_conf *mdev) |
3871 | { | |
3872 | char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ | |
3873 | struct scatterlist sg; | |
3874 | char *response = NULL; | |
3875 | char *right_response = NULL; | |
3876 | char *peers_ch = NULL; | |
3877 | struct p_header p; | |
3878 | unsigned int key_len = strlen(mdev->net_conf->shared_secret); | |
3879 | unsigned int resp_size; | |
3880 | struct hash_desc desc; | |
3881 | int rv; | |
3882 | ||
3883 | desc.tfm = mdev->cram_hmac_tfm; | |
3884 | desc.flags = 0; | |
3885 | ||
3886 | rv = crypto_hash_setkey(mdev->cram_hmac_tfm, | |
3887 | (u8 *)mdev->net_conf->shared_secret, key_len); | |
3888 | if (rv) { | |
3889 | dev_err(DEV, "crypto_hash_setkey() failed with %d\n", rv); | |
b10d96cb | 3890 | rv = -1; |
b411b363 PR |
3891 | goto fail; |
3892 | } | |
3893 | ||
3894 | get_random_bytes(my_challenge, CHALLENGE_LEN); | |
3895 | ||
3896 | rv = drbd_send_cmd2(mdev, P_AUTH_CHALLENGE, my_challenge, CHALLENGE_LEN); | |
3897 | if (!rv) | |
3898 | goto fail; | |
3899 | ||
3900 | rv = drbd_recv_header(mdev, &p); | |
3901 | if (!rv) | |
3902 | goto fail; | |
3903 | ||
3904 | if (p.command != P_AUTH_CHALLENGE) { | |
3905 | dev_err(DEV, "expected AuthChallenge packet, received: %s (0x%04x)\n", | |
3906 | cmdname(p.command), p.command); | |
3907 | rv = 0; | |
3908 | goto fail; | |
3909 | } | |
3910 | ||
3911 | if (p.length > CHALLENGE_LEN*2) { | |
3912 | dev_err(DEV, "expected AuthChallenge payload too big.\n"); | |
b10d96cb | 3913 | rv = -1; |
b411b363 PR |
3914 | goto fail; |
3915 | } | |
3916 | ||
3917 | peers_ch = kmalloc(p.length, GFP_NOIO); | |
3918 | if (peers_ch == NULL) { | |
3919 | dev_err(DEV, "kmalloc of peers_ch failed\n"); | |
b10d96cb | 3920 | rv = -1; |
b411b363 PR |
3921 | goto fail; |
3922 | } | |
3923 | ||
3924 | rv = drbd_recv(mdev, peers_ch, p.length); | |
3925 | ||
3926 | if (rv != p.length) { | |
3927 | dev_err(DEV, "short read AuthChallenge: l=%u\n", rv); | |
3928 | rv = 0; | |
3929 | goto fail; | |
3930 | } | |
3931 | ||
3932 | resp_size = crypto_hash_digestsize(mdev->cram_hmac_tfm); | |
3933 | response = kmalloc(resp_size, GFP_NOIO); | |
3934 | if (response == NULL) { | |
3935 | dev_err(DEV, "kmalloc of response failed\n"); | |
b10d96cb | 3936 | rv = -1; |
b411b363 PR |
3937 | goto fail; |
3938 | } | |
3939 | ||
3940 | sg_init_table(&sg, 1); | |
3941 | sg_set_buf(&sg, peers_ch, p.length); | |
3942 | ||
3943 | rv = crypto_hash_digest(&desc, &sg, sg.length, response); | |
3944 | if (rv) { | |
3945 | dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv); | |
b10d96cb | 3946 | rv = -1; |
b411b363 PR |
3947 | goto fail; |
3948 | } | |
3949 | ||
3950 | rv = drbd_send_cmd2(mdev, P_AUTH_RESPONSE, response, resp_size); | |
3951 | if (!rv) | |
3952 | goto fail; | |
3953 | ||
3954 | rv = drbd_recv_header(mdev, &p); | |
3955 | if (!rv) | |
3956 | goto fail; | |
3957 | ||
3958 | if (p.command != P_AUTH_RESPONSE) { | |
3959 | dev_err(DEV, "expected AuthResponse packet, received: %s (0x%04x)\n", | |
3960 | cmdname(p.command), p.command); | |
3961 | rv = 0; | |
3962 | goto fail; | |
3963 | } | |
3964 | ||
3965 | if (p.length != resp_size) { | |
3966 | dev_err(DEV, "expected AuthResponse payload of wrong size\n"); | |
3967 | rv = 0; | |
3968 | goto fail; | |
3969 | } | |
3970 | ||
3971 | rv = drbd_recv(mdev, response , resp_size); | |
3972 | ||
3973 | if (rv != resp_size) { | |
3974 | dev_err(DEV, "short read receiving AuthResponse: l=%u\n", rv); | |
3975 | rv = 0; | |
3976 | goto fail; | |
3977 | } | |
3978 | ||
3979 | right_response = kmalloc(resp_size, GFP_NOIO); | |
2d1ee87d | 3980 | if (right_response == NULL) { |
b411b363 | 3981 | dev_err(DEV, "kmalloc of right_response failed\n"); |
b10d96cb | 3982 | rv = -1; |
b411b363 PR |
3983 | goto fail; |
3984 | } | |
3985 | ||
3986 | sg_set_buf(&sg, my_challenge, CHALLENGE_LEN); | |
3987 | ||
3988 | rv = crypto_hash_digest(&desc, &sg, sg.length, right_response); | |
3989 | if (rv) { | |
3990 | dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv); | |
b10d96cb | 3991 | rv = -1; |
b411b363 PR |
3992 | goto fail; |
3993 | } | |
3994 | ||
3995 | rv = !memcmp(response, right_response, resp_size); | |
3996 | ||
3997 | if (rv) | |
3998 | dev_info(DEV, "Peer authenticated using %d bytes of '%s' HMAC\n", | |
3999 | resp_size, mdev->net_conf->cram_hmac_alg); | |
b10d96cb JT |
4000 | else |
4001 | rv = -1; | |
b411b363 PR |
4002 | |
4003 | fail: | |
4004 | kfree(peers_ch); | |
4005 | kfree(response); | |
4006 | kfree(right_response); | |
4007 | ||
4008 | return rv; | |
4009 | } | |
4010 | #endif | |
4011 | ||
4012 | int drbdd_init(struct drbd_thread *thi) | |
4013 | { | |
4014 | struct drbd_conf *mdev = thi->mdev; | |
4015 | unsigned int minor = mdev_to_minor(mdev); | |
4016 | int h; | |
4017 | ||
4018 | sprintf(current->comm, "drbd%d_receiver", minor); | |
4019 | ||
4020 | dev_info(DEV, "receiver (re)started\n"); | |
4021 | ||
4022 | do { | |
4023 | h = drbd_connect(mdev); | |
4024 | if (h == 0) { | |
4025 | drbd_disconnect(mdev); | |
4026 | __set_current_state(TASK_INTERRUPTIBLE); | |
4027 | schedule_timeout(HZ); | |
4028 | } | |
4029 | if (h == -1) { | |
4030 | dev_warn(DEV, "Discarding network configuration.\n"); | |
4031 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
4032 | } | |
4033 | } while (h == 0); | |
4034 | ||
4035 | if (h > 0) { | |
4036 | if (get_net_conf(mdev)) { | |
4037 | drbdd(mdev); | |
4038 | put_net_conf(mdev); | |
4039 | } | |
4040 | } | |
4041 | ||
4042 | drbd_disconnect(mdev); | |
4043 | ||
4044 | dev_info(DEV, "receiver terminated\n"); | |
4045 | return 0; | |
4046 | } | |
4047 | ||
4048 | /* ********* acknowledge sender ******** */ | |
4049 | ||
4050 | static int got_RqSReply(struct drbd_conf *mdev, struct p_header *h) | |
4051 | { | |
4052 | struct p_req_state_reply *p = (struct p_req_state_reply *)h; | |
4053 | ||
4054 | int retcode = be32_to_cpu(p->retcode); | |
4055 | ||
4056 | if (retcode >= SS_SUCCESS) { | |
4057 | set_bit(CL_ST_CHG_SUCCESS, &mdev->flags); | |
4058 | } else { | |
4059 | set_bit(CL_ST_CHG_FAIL, &mdev->flags); | |
4060 | dev_err(DEV, "Requested state change failed by peer: %s (%d)\n", | |
4061 | drbd_set_st_err_str(retcode), retcode); | |
4062 | } | |
4063 | wake_up(&mdev->state_wait); | |
4064 | ||
4065 | return TRUE; | |
4066 | } | |
4067 | ||
4068 | static int got_Ping(struct drbd_conf *mdev, struct p_header *h) | |
4069 | { | |
4070 | return drbd_send_ping_ack(mdev); | |
4071 | ||
4072 | } | |
4073 | ||
4074 | static int got_PingAck(struct drbd_conf *mdev, struct p_header *h) | |
4075 | { | |
4076 | /* restore idle timeout */ | |
4077 | mdev->meta.socket->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ; | |
309d1608 PR |
4078 | if (!test_and_set_bit(GOT_PING_ACK, &mdev->flags)) |
4079 | wake_up(&mdev->misc_wait); | |
b411b363 PR |
4080 | |
4081 | return TRUE; | |
4082 | } | |
4083 | ||
4084 | static int got_IsInSync(struct drbd_conf *mdev, struct p_header *h) | |
4085 | { | |
4086 | struct p_block_ack *p = (struct p_block_ack *)h; | |
4087 | sector_t sector = be64_to_cpu(p->sector); | |
4088 | int blksize = be32_to_cpu(p->blksize); | |
4089 | ||
4090 | D_ASSERT(mdev->agreed_pro_version >= 89); | |
4091 | ||
4092 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
4093 | ||
4094 | drbd_rs_complete_io(mdev, sector); | |
4095 | drbd_set_in_sync(mdev, sector, blksize); | |
4096 | /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ | |
4097 | mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); | |
4098 | dec_rs_pending(mdev); | |
4099 | ||
4100 | return TRUE; | |
4101 | } | |
4102 | ||
4103 | /* when we receive the ACK for a write request, | |
4104 | * verify that we actually know about it */ | |
4105 | static struct drbd_request *_ack_id_to_req(struct drbd_conf *mdev, | |
4106 | u64 id, sector_t sector) | |
4107 | { | |
4108 | struct hlist_head *slot = tl_hash_slot(mdev, sector); | |
4109 | struct hlist_node *n; | |
4110 | struct drbd_request *req; | |
4111 | ||
4112 | hlist_for_each_entry(req, n, slot, colision) { | |
4113 | if ((unsigned long)req == (unsigned long)id) { | |
4114 | if (req->sector != sector) { | |
4115 | dev_err(DEV, "_ack_id_to_req: found req %p but it has " | |
4116 | "wrong sector (%llus versus %llus)\n", req, | |
4117 | (unsigned long long)req->sector, | |
4118 | (unsigned long long)sector); | |
4119 | break; | |
4120 | } | |
4121 | return req; | |
4122 | } | |
4123 | } | |
4124 | dev_err(DEV, "_ack_id_to_req: failed to find req %p, sector %llus in list\n", | |
4125 | (void *)(unsigned long)id, (unsigned long long)sector); | |
4126 | return NULL; | |
4127 | } | |
4128 | ||
4129 | typedef struct drbd_request *(req_validator_fn) | |
4130 | (struct drbd_conf *mdev, u64 id, sector_t sector); | |
4131 | ||
4132 | static int validate_req_change_req_state(struct drbd_conf *mdev, | |
4133 | u64 id, sector_t sector, req_validator_fn validator, | |
4134 | const char *func, enum drbd_req_event what) | |
4135 | { | |
4136 | struct drbd_request *req; | |
4137 | struct bio_and_error m; | |
4138 | ||
4139 | spin_lock_irq(&mdev->req_lock); | |
4140 | req = validator(mdev, id, sector); | |
4141 | if (unlikely(!req)) { | |
4142 | spin_unlock_irq(&mdev->req_lock); | |
4143 | dev_err(DEV, "%s: got a corrupt block_id/sector pair\n", func); | |
4144 | return FALSE; | |
4145 | } | |
4146 | __req_mod(req, what, &m); | |
4147 | spin_unlock_irq(&mdev->req_lock); | |
4148 | ||
4149 | if (m.bio) | |
4150 | complete_master_bio(mdev, &m); | |
4151 | return TRUE; | |
4152 | } | |
4153 | ||
4154 | static int got_BlockAck(struct drbd_conf *mdev, struct p_header *h) | |
4155 | { | |
4156 | struct p_block_ack *p = (struct p_block_ack *)h; | |
4157 | sector_t sector = be64_to_cpu(p->sector); | |
4158 | int blksize = be32_to_cpu(p->blksize); | |
4159 | enum drbd_req_event what; | |
4160 | ||
4161 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
4162 | ||
4163 | if (is_syncer_block_id(p->block_id)) { | |
4164 | drbd_set_in_sync(mdev, sector, blksize); | |
4165 | dec_rs_pending(mdev); | |
4166 | return TRUE; | |
4167 | } | |
4168 | switch (be16_to_cpu(h->command)) { | |
4169 | case P_RS_WRITE_ACK: | |
4170 | D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); | |
4171 | what = write_acked_by_peer_and_sis; | |
4172 | break; | |
4173 | case P_WRITE_ACK: | |
4174 | D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); | |
4175 | what = write_acked_by_peer; | |
4176 | break; | |
4177 | case P_RECV_ACK: | |
4178 | D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_B); | |
4179 | what = recv_acked_by_peer; | |
4180 | break; | |
4181 | case P_DISCARD_ACK: | |
4182 | D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); | |
4183 | what = conflict_discarded_by_peer; | |
4184 | break; | |
4185 | default: | |
4186 | D_ASSERT(0); | |
4187 | return FALSE; | |
4188 | } | |
4189 | ||
4190 | return validate_req_change_req_state(mdev, p->block_id, sector, | |
4191 | _ack_id_to_req, __func__ , what); | |
4192 | } | |
4193 | ||
4194 | static int got_NegAck(struct drbd_conf *mdev, struct p_header *h) | |
4195 | { | |
4196 | struct p_block_ack *p = (struct p_block_ack *)h; | |
4197 | sector_t sector = be64_to_cpu(p->sector); | |
4198 | ||
4199 | if (__ratelimit(&drbd_ratelimit_state)) | |
4200 | dev_warn(DEV, "Got NegAck packet. Peer is in troubles?\n"); | |
4201 | ||
4202 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
4203 | ||
4204 | if (is_syncer_block_id(p->block_id)) { | |
4205 | int size = be32_to_cpu(p->blksize); | |
4206 | dec_rs_pending(mdev); | |
4207 | drbd_rs_failed_io(mdev, sector, size); | |
4208 | return TRUE; | |
4209 | } | |
4210 | return validate_req_change_req_state(mdev, p->block_id, sector, | |
4211 | _ack_id_to_req, __func__ , neg_acked); | |
4212 | } | |
4213 | ||
4214 | static int got_NegDReply(struct drbd_conf *mdev, struct p_header *h) | |
4215 | { | |
4216 | struct p_block_ack *p = (struct p_block_ack *)h; | |
4217 | sector_t sector = be64_to_cpu(p->sector); | |
4218 | ||
4219 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
4220 | dev_err(DEV, "Got NegDReply; Sector %llus, len %u; Fail original request.\n", | |
4221 | (unsigned long long)sector, be32_to_cpu(p->blksize)); | |
4222 | ||
4223 | return validate_req_change_req_state(mdev, p->block_id, sector, | |
4224 | _ar_id_to_req, __func__ , neg_acked); | |
4225 | } | |
4226 | ||
4227 | static int got_NegRSDReply(struct drbd_conf *mdev, struct p_header *h) | |
4228 | { | |
4229 | sector_t sector; | |
4230 | int size; | |
4231 | struct p_block_ack *p = (struct p_block_ack *)h; | |
4232 | ||
4233 | sector = be64_to_cpu(p->sector); | |
4234 | size = be32_to_cpu(p->blksize); | |
4235 | D_ASSERT(p->block_id == ID_SYNCER); | |
4236 | ||
4237 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
4238 | ||
4239 | dec_rs_pending(mdev); | |
4240 | ||
4241 | if (get_ldev_if_state(mdev, D_FAILED)) { | |
4242 | drbd_rs_complete_io(mdev, sector); | |
4243 | drbd_rs_failed_io(mdev, sector, size); | |
4244 | put_ldev(mdev); | |
4245 | } | |
4246 | ||
4247 | return TRUE; | |
4248 | } | |
4249 | ||
4250 | static int got_BarrierAck(struct drbd_conf *mdev, struct p_header *h) | |
4251 | { | |
4252 | struct p_barrier_ack *p = (struct p_barrier_ack *)h; | |
4253 | ||
4254 | tl_release(mdev, p->barrier, be32_to_cpu(p->set_size)); | |
4255 | ||
4256 | return TRUE; | |
4257 | } | |
4258 | ||
4259 | static int got_OVResult(struct drbd_conf *mdev, struct p_header *h) | |
4260 | { | |
4261 | struct p_block_ack *p = (struct p_block_ack *)h; | |
4262 | struct drbd_work *w; | |
4263 | sector_t sector; | |
4264 | int size; | |
4265 | ||
4266 | sector = be64_to_cpu(p->sector); | |
4267 | size = be32_to_cpu(p->blksize); | |
4268 | ||
4269 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
4270 | ||
4271 | if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) | |
4272 | drbd_ov_oos_found(mdev, sector, size); | |
4273 | else | |
4274 | ov_oos_print(mdev); | |
4275 | ||
4276 | drbd_rs_complete_io(mdev, sector); | |
4277 | dec_rs_pending(mdev); | |
4278 | ||
4279 | if (--mdev->ov_left == 0) { | |
4280 | w = kmalloc(sizeof(*w), GFP_NOIO); | |
4281 | if (w) { | |
4282 | w->cb = w_ov_finished; | |
4283 | drbd_queue_work_front(&mdev->data.work, w); | |
4284 | } else { | |
4285 | dev_err(DEV, "kmalloc(w) failed."); | |
4286 | ov_oos_print(mdev); | |
4287 | drbd_resync_finished(mdev); | |
4288 | } | |
4289 | } | |
4290 | return TRUE; | |
4291 | } | |
4292 | ||
4293 | struct asender_cmd { | |
4294 | size_t pkt_size; | |
4295 | int (*process)(struct drbd_conf *mdev, struct p_header *h); | |
4296 | }; | |
4297 | ||
4298 | static struct asender_cmd *get_asender_cmd(int cmd) | |
4299 | { | |
4300 | static struct asender_cmd asender_tbl[] = { | |
4301 | /* anything missing from this table is in | |
4302 | * the drbd_cmd_handler (drbd_default_handler) table, | |
4303 | * see the beginning of drbdd() */ | |
4304 | [P_PING] = { sizeof(struct p_header), got_Ping }, | |
4305 | [P_PING_ACK] = { sizeof(struct p_header), got_PingAck }, | |
4306 | [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, | |
4307 | [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, | |
4308 | [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, | |
4309 | [P_DISCARD_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, | |
4310 | [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, | |
4311 | [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, | |
4312 | [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply}, | |
4313 | [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, | |
4314 | [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, | |
4315 | [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, | |
4316 | [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, | |
4317 | [P_MAX_CMD] = { 0, NULL }, | |
4318 | }; | |
4319 | if (cmd > P_MAX_CMD || asender_tbl[cmd].process == NULL) | |
4320 | return NULL; | |
4321 | return &asender_tbl[cmd]; | |
4322 | } | |
4323 | ||
4324 | int drbd_asender(struct drbd_thread *thi) | |
4325 | { | |
4326 | struct drbd_conf *mdev = thi->mdev; | |
4327 | struct p_header *h = &mdev->meta.rbuf.header; | |
4328 | struct asender_cmd *cmd = NULL; | |
4329 | ||
4330 | int rv, len; | |
4331 | void *buf = h; | |
4332 | int received = 0; | |
4333 | int expect = sizeof(struct p_header); | |
4334 | int empty; | |
4335 | ||
4336 | sprintf(current->comm, "drbd%d_asender", mdev_to_minor(mdev)); | |
4337 | ||
4338 | current->policy = SCHED_RR; /* Make this a realtime task! */ | |
4339 | current->rt_priority = 2; /* more important than all other tasks */ | |
4340 | ||
4341 | while (get_t_state(thi) == Running) { | |
4342 | drbd_thread_current_set_cpu(mdev); | |
4343 | if (test_and_clear_bit(SEND_PING, &mdev->flags)) { | |
4344 | ERR_IF(!drbd_send_ping(mdev)) goto reconnect; | |
4345 | mdev->meta.socket->sk->sk_rcvtimeo = | |
4346 | mdev->net_conf->ping_timeo*HZ/10; | |
4347 | } | |
4348 | ||
4349 | /* conditionally cork; | |
4350 | * it may hurt latency if we cork without much to send */ | |
4351 | if (!mdev->net_conf->no_cork && | |
4352 | 3 < atomic_read(&mdev->unacked_cnt)) | |
4353 | drbd_tcp_cork(mdev->meta.socket); | |
4354 | while (1) { | |
4355 | clear_bit(SIGNAL_ASENDER, &mdev->flags); | |
4356 | flush_signals(current); | |
4357 | if (!drbd_process_done_ee(mdev)) { | |
4358 | dev_err(DEV, "process_done_ee() = NOT_OK\n"); | |
4359 | goto reconnect; | |
4360 | } | |
4361 | /* to avoid race with newly queued ACKs */ | |
4362 | set_bit(SIGNAL_ASENDER, &mdev->flags); | |
4363 | spin_lock_irq(&mdev->req_lock); | |
4364 | empty = list_empty(&mdev->done_ee); | |
4365 | spin_unlock_irq(&mdev->req_lock); | |
4366 | /* new ack may have been queued right here, | |
4367 | * but then there is also a signal pending, | |
4368 | * and we start over... */ | |
4369 | if (empty) | |
4370 | break; | |
4371 | } | |
4372 | /* but unconditionally uncork unless disabled */ | |
4373 | if (!mdev->net_conf->no_cork) | |
4374 | drbd_tcp_uncork(mdev->meta.socket); | |
4375 | ||
4376 | /* short circuit, recv_msg would return EINTR anyways. */ | |
4377 | if (signal_pending(current)) | |
4378 | continue; | |
4379 | ||
4380 | rv = drbd_recv_short(mdev, mdev->meta.socket, | |
4381 | buf, expect-received, 0); | |
4382 | clear_bit(SIGNAL_ASENDER, &mdev->flags); | |
4383 | ||
4384 | flush_signals(current); | |
4385 | ||
4386 | /* Note: | |
4387 | * -EINTR (on meta) we got a signal | |
4388 | * -EAGAIN (on meta) rcvtimeo expired | |
4389 | * -ECONNRESET other side closed the connection | |
4390 | * -ERESTARTSYS (on data) we got a signal | |
4391 | * rv < 0 other than above: unexpected error! | |
4392 | * rv == expected: full header or command | |
4393 | * rv < expected: "woken" by signal during receive | |
4394 | * rv == 0 : "connection shut down by peer" | |
4395 | */ | |
4396 | if (likely(rv > 0)) { | |
4397 | received += rv; | |
4398 | buf += rv; | |
4399 | } else if (rv == 0) { | |
4400 | dev_err(DEV, "meta connection shut down by peer.\n"); | |
4401 | goto reconnect; | |
4402 | } else if (rv == -EAGAIN) { | |
4403 | if (mdev->meta.socket->sk->sk_rcvtimeo == | |
4404 | mdev->net_conf->ping_timeo*HZ/10) { | |
4405 | dev_err(DEV, "PingAck did not arrive in time.\n"); | |
4406 | goto reconnect; | |
4407 | } | |
4408 | set_bit(SEND_PING, &mdev->flags); | |
4409 | continue; | |
4410 | } else if (rv == -EINTR) { | |
4411 | continue; | |
4412 | } else { | |
4413 | dev_err(DEV, "sock_recvmsg returned %d\n", rv); | |
4414 | goto reconnect; | |
4415 | } | |
4416 | ||
4417 | if (received == expect && cmd == NULL) { | |
4418 | if (unlikely(h->magic != BE_DRBD_MAGIC)) { | |
4419 | dev_err(DEV, "magic?? on meta m: 0x%lx c: %d l: %d\n", | |
4420 | (long)be32_to_cpu(h->magic), | |
4421 | h->command, h->length); | |
4422 | goto reconnect; | |
4423 | } | |
4424 | cmd = get_asender_cmd(be16_to_cpu(h->command)); | |
4425 | len = be16_to_cpu(h->length); | |
4426 | if (unlikely(cmd == NULL)) { | |
4427 | dev_err(DEV, "unknown command?? on meta m: 0x%lx c: %d l: %d\n", | |
4428 | (long)be32_to_cpu(h->magic), | |
4429 | h->command, h->length); | |
4430 | goto disconnect; | |
4431 | } | |
4432 | expect = cmd->pkt_size; | |
6a0afdf5 | 4433 | ERR_IF(len != expect-sizeof(struct p_header)) |
b411b363 | 4434 | goto reconnect; |
b411b363 PR |
4435 | } |
4436 | if (received == expect) { | |
4437 | D_ASSERT(cmd != NULL); | |
b411b363 PR |
4438 | if (!cmd->process(mdev, h)) |
4439 | goto reconnect; | |
4440 | ||
4441 | buf = h; | |
4442 | received = 0; | |
4443 | expect = sizeof(struct p_header); | |
4444 | cmd = NULL; | |
4445 | } | |
4446 | } | |
4447 | ||
4448 | if (0) { | |
4449 | reconnect: | |
4450 | drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE)); | |
4451 | } | |
4452 | if (0) { | |
4453 | disconnect: | |
4454 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
4455 | } | |
4456 | clear_bit(SIGNAL_ASENDER, &mdev->flags); | |
4457 | ||
4458 | D_ASSERT(mdev->state.conn < C_CONNECTED); | |
4459 | dev_info(DEV, "asender terminated\n"); | |
4460 | ||
4461 | return 0; | |
4462 | } |