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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 | ||
45bb912b LE |
83 | /* |
84 | * some helper functions to deal with single linked page lists, | |
85 | * page->private being our "next" pointer. | |
86 | */ | |
87 | ||
88 | /* If at least n pages are linked at head, get n pages off. | |
89 | * Otherwise, don't modify head, and return NULL. | |
90 | * Locking is the responsibility of the caller. | |
91 | */ | |
92 | static struct page *page_chain_del(struct page **head, int n) | |
93 | { | |
94 | struct page *page; | |
95 | struct page *tmp; | |
96 | ||
97 | BUG_ON(!n); | |
98 | BUG_ON(!head); | |
99 | ||
100 | page = *head; | |
101 | while (page) { | |
102 | tmp = page_chain_next(page); | |
103 | if (--n == 0) | |
104 | break; /* found sufficient pages */ | |
105 | if (tmp == NULL) | |
106 | /* insufficient pages, don't use any of them. */ | |
107 | return NULL; | |
108 | page = tmp; | |
109 | } | |
110 | ||
111 | /* add end of list marker for the returned list */ | |
112 | set_page_private(page, 0); | |
113 | /* actual return value, and adjustment of head */ | |
114 | page = *head; | |
115 | *head = tmp; | |
116 | return page; | |
117 | } | |
118 | ||
119 | /* may be used outside of locks to find the tail of a (usually short) | |
120 | * "private" page chain, before adding it back to a global chain head | |
121 | * with page_chain_add() under a spinlock. */ | |
122 | static struct page *page_chain_tail(struct page *page, int *len) | |
123 | { | |
124 | struct page *tmp; | |
125 | int i = 1; | |
126 | while ((tmp = page_chain_next(page))) | |
127 | ++i, page = tmp; | |
128 | if (len) | |
129 | *len = i; | |
130 | return page; | |
131 | } | |
132 | ||
133 | static int page_chain_free(struct page *page) | |
134 | { | |
135 | struct page *tmp; | |
136 | int i = 0; | |
137 | page_chain_for_each_safe(page, tmp) { | |
138 | put_page(page); | |
139 | ++i; | |
140 | } | |
141 | return i; | |
142 | } | |
143 | ||
144 | static void page_chain_add(struct page **head, | |
145 | struct page *chain_first, struct page *chain_last) | |
146 | { | |
147 | #if 1 | |
148 | struct page *tmp; | |
149 | tmp = page_chain_tail(chain_first, NULL); | |
150 | BUG_ON(tmp != chain_last); | |
151 | #endif | |
152 | ||
153 | /* add chain to head */ | |
154 | set_page_private(chain_last, (unsigned long)*head); | |
155 | *head = chain_first; | |
156 | } | |
157 | ||
158 | static struct page *drbd_pp_first_pages_or_try_alloc(struct drbd_conf *mdev, int number) | |
b411b363 PR |
159 | { |
160 | struct page *page = NULL; | |
45bb912b LE |
161 | struct page *tmp = NULL; |
162 | int i = 0; | |
b411b363 PR |
163 | |
164 | /* Yes, testing drbd_pp_vacant outside the lock is racy. | |
165 | * So what. It saves a spin_lock. */ | |
45bb912b | 166 | if (drbd_pp_vacant >= number) { |
b411b363 | 167 | spin_lock(&drbd_pp_lock); |
45bb912b LE |
168 | page = page_chain_del(&drbd_pp_pool, number); |
169 | if (page) | |
170 | drbd_pp_vacant -= number; | |
b411b363 | 171 | spin_unlock(&drbd_pp_lock); |
45bb912b LE |
172 | if (page) |
173 | return page; | |
b411b363 | 174 | } |
45bb912b | 175 | |
b411b363 PR |
176 | /* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD |
177 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
178 | * which in turn might block on the other node at this very place. */ | |
45bb912b LE |
179 | for (i = 0; i < number; i++) { |
180 | tmp = alloc_page(GFP_TRY); | |
181 | if (!tmp) | |
182 | break; | |
183 | set_page_private(tmp, (unsigned long)page); | |
184 | page = tmp; | |
185 | } | |
186 | ||
187 | if (i == number) | |
188 | return page; | |
189 | ||
190 | /* Not enough pages immediately available this time. | |
191 | * No need to jump around here, drbd_pp_alloc will retry this | |
192 | * function "soon". */ | |
193 | if (page) { | |
194 | tmp = page_chain_tail(page, NULL); | |
195 | spin_lock(&drbd_pp_lock); | |
196 | page_chain_add(&drbd_pp_pool, page, tmp); | |
197 | drbd_pp_vacant += i; | |
198 | spin_unlock(&drbd_pp_lock); | |
199 | } | |
200 | return NULL; | |
b411b363 PR |
201 | } |
202 | ||
203 | /* kick lower level device, if we have more than (arbitrary number) | |
204 | * reference counts on it, which typically are locally submitted io | |
205 | * requests. don't use unacked_cnt, so we speed up proto A and B, too. */ | |
206 | static void maybe_kick_lo(struct drbd_conf *mdev) | |
207 | { | |
208 | if (atomic_read(&mdev->local_cnt) >= mdev->net_conf->unplug_watermark) | |
209 | drbd_kick_lo(mdev); | |
210 | } | |
211 | ||
212 | static void reclaim_net_ee(struct drbd_conf *mdev, struct list_head *to_be_freed) | |
213 | { | |
214 | struct drbd_epoch_entry *e; | |
215 | struct list_head *le, *tle; | |
216 | ||
217 | /* The EEs are always appended to the end of the list. Since | |
218 | they are sent in order over the wire, they have to finish | |
219 | in order. As soon as we see the first not finished we can | |
220 | stop to examine the list... */ | |
221 | ||
222 | list_for_each_safe(le, tle, &mdev->net_ee) { | |
223 | e = list_entry(le, struct drbd_epoch_entry, w.list); | |
45bb912b | 224 | if (drbd_ee_has_active_page(e)) |
b411b363 PR |
225 | break; |
226 | list_move(le, to_be_freed); | |
227 | } | |
228 | } | |
229 | ||
230 | static void drbd_kick_lo_and_reclaim_net(struct drbd_conf *mdev) | |
231 | { | |
232 | LIST_HEAD(reclaimed); | |
233 | struct drbd_epoch_entry *e, *t; | |
234 | ||
235 | maybe_kick_lo(mdev); | |
236 | spin_lock_irq(&mdev->req_lock); | |
237 | reclaim_net_ee(mdev, &reclaimed); | |
238 | spin_unlock_irq(&mdev->req_lock); | |
239 | ||
240 | list_for_each_entry_safe(e, t, &reclaimed, w.list) | |
241 | drbd_free_ee(mdev, e); | |
242 | } | |
243 | ||
244 | /** | |
45bb912b | 245 | * drbd_pp_alloc() - Returns @number pages, retries forever (or until signalled) |
b411b363 | 246 | * @mdev: DRBD device. |
45bb912b LE |
247 | * @number: number of pages requested |
248 | * @retry: whether to retry, if not enough pages are available right now | |
249 | * | |
250 | * Tries to allocate number pages, first from our own page pool, then from | |
251 | * the kernel, unless this allocation would exceed the max_buffers setting. | |
252 | * Possibly retry until DRBD frees sufficient pages somewhere else. | |
b411b363 | 253 | * |
45bb912b | 254 | * Returns a page chain linked via page->private. |
b411b363 | 255 | */ |
45bb912b | 256 | static struct page *drbd_pp_alloc(struct drbd_conf *mdev, unsigned number, bool retry) |
b411b363 PR |
257 | { |
258 | struct page *page = NULL; | |
259 | DEFINE_WAIT(wait); | |
260 | ||
45bb912b LE |
261 | /* Yes, we may run up to @number over max_buffers. If we |
262 | * follow it strictly, the admin will get it wrong anyways. */ | |
263 | if (atomic_read(&mdev->pp_in_use) < mdev->net_conf->max_buffers) | |
264 | page = drbd_pp_first_pages_or_try_alloc(mdev, number); | |
b411b363 | 265 | |
45bb912b | 266 | while (page == NULL) { |
b411b363 PR |
267 | prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE); |
268 | ||
269 | drbd_kick_lo_and_reclaim_net(mdev); | |
270 | ||
271 | if (atomic_read(&mdev->pp_in_use) < mdev->net_conf->max_buffers) { | |
45bb912b | 272 | page = drbd_pp_first_pages_or_try_alloc(mdev, number); |
b411b363 PR |
273 | if (page) |
274 | break; | |
275 | } | |
276 | ||
277 | if (!retry) | |
278 | break; | |
279 | ||
280 | if (signal_pending(current)) { | |
281 | dev_warn(DEV, "drbd_pp_alloc interrupted!\n"); | |
282 | break; | |
283 | } | |
284 | ||
285 | schedule(); | |
286 | } | |
287 | finish_wait(&drbd_pp_wait, &wait); | |
288 | ||
45bb912b LE |
289 | if (page) |
290 | atomic_add(number, &mdev->pp_in_use); | |
b411b363 PR |
291 | return page; |
292 | } | |
293 | ||
294 | /* Must not be used from irq, as that may deadlock: see drbd_pp_alloc. | |
45bb912b LE |
295 | * Is also used from inside an other spin_lock_irq(&mdev->req_lock); |
296 | * Either links the page chain back to the global pool, | |
297 | * or returns all pages to the system. */ | |
b411b363 PR |
298 | static void drbd_pp_free(struct drbd_conf *mdev, struct page *page) |
299 | { | |
b411b363 | 300 | int i; |
45bb912b LE |
301 | if (drbd_pp_vacant > (DRBD_MAX_SEGMENT_SIZE/PAGE_SIZE)*minor_count) |
302 | i = page_chain_free(page); | |
303 | else { | |
304 | struct page *tmp; | |
305 | tmp = page_chain_tail(page, &i); | |
306 | spin_lock(&drbd_pp_lock); | |
307 | page_chain_add(&drbd_pp_pool, page, tmp); | |
308 | drbd_pp_vacant += i; | |
309 | spin_unlock(&drbd_pp_lock); | |
b411b363 | 310 | } |
45bb912b LE |
311 | atomic_sub(i, &mdev->pp_in_use); |
312 | i = atomic_read(&mdev->pp_in_use); | |
313 | if (i < 0) | |
314 | dev_warn(DEV, "ASSERTION FAILED: pp_in_use: %d < 0\n", i); | |
b411b363 PR |
315 | wake_up(&drbd_pp_wait); |
316 | } | |
317 | ||
318 | /* | |
319 | You need to hold the req_lock: | |
320 | _drbd_wait_ee_list_empty() | |
321 | ||
322 | You must not have the req_lock: | |
323 | drbd_free_ee() | |
324 | drbd_alloc_ee() | |
325 | drbd_init_ee() | |
326 | drbd_release_ee() | |
327 | drbd_ee_fix_bhs() | |
328 | drbd_process_done_ee() | |
329 | drbd_clear_done_ee() | |
330 | drbd_wait_ee_list_empty() | |
331 | */ | |
332 | ||
333 | struct drbd_epoch_entry *drbd_alloc_ee(struct drbd_conf *mdev, | |
334 | u64 id, | |
335 | sector_t sector, | |
336 | unsigned int data_size, | |
337 | gfp_t gfp_mask) __must_hold(local) | |
338 | { | |
b411b363 PR |
339 | struct drbd_epoch_entry *e; |
340 | struct page *page; | |
45bb912b | 341 | unsigned nr_pages = (data_size + PAGE_SIZE -1) >> PAGE_SHIFT; |
b411b363 PR |
342 | |
343 | if (FAULT_ACTIVE(mdev, DRBD_FAULT_AL_EE)) | |
344 | return NULL; | |
345 | ||
346 | e = mempool_alloc(drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM); | |
347 | if (!e) { | |
348 | if (!(gfp_mask & __GFP_NOWARN)) | |
349 | dev_err(DEV, "alloc_ee: Allocation of an EE failed\n"); | |
350 | return NULL; | |
351 | } | |
352 | ||
45bb912b LE |
353 | page = drbd_pp_alloc(mdev, nr_pages, (gfp_mask & __GFP_WAIT)); |
354 | if (!page) | |
355 | goto fail; | |
b411b363 | 356 | |
b411b363 PR |
357 | INIT_HLIST_NODE(&e->colision); |
358 | e->epoch = NULL; | |
45bb912b LE |
359 | e->mdev = mdev; |
360 | e->pages = page; | |
361 | atomic_set(&e->pending_bios, 0); | |
362 | e->size = data_size; | |
b411b363 | 363 | e->flags = 0; |
45bb912b LE |
364 | e->sector = sector; |
365 | e->sector = sector; | |
366 | e->block_id = id; | |
b411b363 | 367 | |
b411b363 PR |
368 | return e; |
369 | ||
45bb912b | 370 | fail: |
b411b363 | 371 | mempool_free(e, drbd_ee_mempool); |
b411b363 PR |
372 | return NULL; |
373 | } | |
374 | ||
375 | void drbd_free_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e) | |
376 | { | |
45bb912b LE |
377 | drbd_pp_free(mdev, e->pages); |
378 | D_ASSERT(atomic_read(&e->pending_bios) == 0); | |
b411b363 PR |
379 | D_ASSERT(hlist_unhashed(&e->colision)); |
380 | mempool_free(e, drbd_ee_mempool); | |
381 | } | |
382 | ||
383 | int drbd_release_ee(struct drbd_conf *mdev, struct list_head *list) | |
384 | { | |
385 | LIST_HEAD(work_list); | |
386 | struct drbd_epoch_entry *e, *t; | |
387 | int count = 0; | |
388 | ||
389 | spin_lock_irq(&mdev->req_lock); | |
390 | list_splice_init(list, &work_list); | |
391 | spin_unlock_irq(&mdev->req_lock); | |
392 | ||
393 | list_for_each_entry_safe(e, t, &work_list, w.list) { | |
394 | drbd_free_ee(mdev, e); | |
395 | count++; | |
396 | } | |
397 | return count; | |
398 | } | |
399 | ||
400 | ||
401 | /* | |
402 | * This function is called from _asender only_ | |
403 | * but see also comments in _req_mod(,barrier_acked) | |
404 | * and receive_Barrier. | |
405 | * | |
406 | * Move entries from net_ee to done_ee, if ready. | |
407 | * Grab done_ee, call all callbacks, free the entries. | |
408 | * The callbacks typically send out ACKs. | |
409 | */ | |
410 | static int drbd_process_done_ee(struct drbd_conf *mdev) | |
411 | { | |
412 | LIST_HEAD(work_list); | |
413 | LIST_HEAD(reclaimed); | |
414 | struct drbd_epoch_entry *e, *t; | |
415 | int ok = (mdev->state.conn >= C_WF_REPORT_PARAMS); | |
416 | ||
417 | spin_lock_irq(&mdev->req_lock); | |
418 | reclaim_net_ee(mdev, &reclaimed); | |
419 | list_splice_init(&mdev->done_ee, &work_list); | |
420 | spin_unlock_irq(&mdev->req_lock); | |
421 | ||
422 | list_for_each_entry_safe(e, t, &reclaimed, w.list) | |
423 | drbd_free_ee(mdev, e); | |
424 | ||
425 | /* possible callbacks here: | |
426 | * e_end_block, and e_end_resync_block, e_send_discard_ack. | |
427 | * all ignore the last argument. | |
428 | */ | |
429 | list_for_each_entry_safe(e, t, &work_list, w.list) { | |
b411b363 PR |
430 | /* list_del not necessary, next/prev members not touched */ |
431 | ok = e->w.cb(mdev, &e->w, !ok) && ok; | |
432 | drbd_free_ee(mdev, e); | |
433 | } | |
434 | wake_up(&mdev->ee_wait); | |
435 | ||
436 | return ok; | |
437 | } | |
438 | ||
439 | void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head) | |
440 | { | |
441 | DEFINE_WAIT(wait); | |
442 | ||
443 | /* avoids spin_lock/unlock | |
444 | * and calling prepare_to_wait in the fast path */ | |
445 | while (!list_empty(head)) { | |
446 | prepare_to_wait(&mdev->ee_wait, &wait, TASK_UNINTERRUPTIBLE); | |
447 | spin_unlock_irq(&mdev->req_lock); | |
448 | drbd_kick_lo(mdev); | |
449 | schedule(); | |
450 | finish_wait(&mdev->ee_wait, &wait); | |
451 | spin_lock_irq(&mdev->req_lock); | |
452 | } | |
453 | } | |
454 | ||
455 | void drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head) | |
456 | { | |
457 | spin_lock_irq(&mdev->req_lock); | |
458 | _drbd_wait_ee_list_empty(mdev, head); | |
459 | spin_unlock_irq(&mdev->req_lock); | |
460 | } | |
461 | ||
462 | /* see also kernel_accept; which is only present since 2.6.18. | |
463 | * also we want to log which part of it failed, exactly */ | |
464 | static int drbd_accept(struct drbd_conf *mdev, const char **what, | |
465 | struct socket *sock, struct socket **newsock) | |
466 | { | |
467 | struct sock *sk = sock->sk; | |
468 | int err = 0; | |
469 | ||
470 | *what = "listen"; | |
471 | err = sock->ops->listen(sock, 5); | |
472 | if (err < 0) | |
473 | goto out; | |
474 | ||
475 | *what = "sock_create_lite"; | |
476 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, | |
477 | newsock); | |
478 | if (err < 0) | |
479 | goto out; | |
480 | ||
481 | *what = "accept"; | |
482 | err = sock->ops->accept(sock, *newsock, 0); | |
483 | if (err < 0) { | |
484 | sock_release(*newsock); | |
485 | *newsock = NULL; | |
486 | goto out; | |
487 | } | |
488 | (*newsock)->ops = sock->ops; | |
489 | ||
490 | out: | |
491 | return err; | |
492 | } | |
493 | ||
494 | static int drbd_recv_short(struct drbd_conf *mdev, struct socket *sock, | |
495 | void *buf, size_t size, int flags) | |
496 | { | |
497 | mm_segment_t oldfs; | |
498 | struct kvec iov = { | |
499 | .iov_base = buf, | |
500 | .iov_len = size, | |
501 | }; | |
502 | struct msghdr msg = { | |
503 | .msg_iovlen = 1, | |
504 | .msg_iov = (struct iovec *)&iov, | |
505 | .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) | |
506 | }; | |
507 | int rv; | |
508 | ||
509 | oldfs = get_fs(); | |
510 | set_fs(KERNEL_DS); | |
511 | rv = sock_recvmsg(sock, &msg, size, msg.msg_flags); | |
512 | set_fs(oldfs); | |
513 | ||
514 | return rv; | |
515 | } | |
516 | ||
517 | static int drbd_recv(struct drbd_conf *mdev, void *buf, size_t size) | |
518 | { | |
519 | mm_segment_t oldfs; | |
520 | struct kvec iov = { | |
521 | .iov_base = buf, | |
522 | .iov_len = size, | |
523 | }; | |
524 | struct msghdr msg = { | |
525 | .msg_iovlen = 1, | |
526 | .msg_iov = (struct iovec *)&iov, | |
527 | .msg_flags = MSG_WAITALL | MSG_NOSIGNAL | |
528 | }; | |
529 | int rv; | |
530 | ||
531 | oldfs = get_fs(); | |
532 | set_fs(KERNEL_DS); | |
533 | ||
534 | for (;;) { | |
535 | rv = sock_recvmsg(mdev->data.socket, &msg, size, msg.msg_flags); | |
536 | if (rv == size) | |
537 | break; | |
538 | ||
539 | /* Note: | |
540 | * ECONNRESET other side closed the connection | |
541 | * ERESTARTSYS (on sock) we got a signal | |
542 | */ | |
543 | ||
544 | if (rv < 0) { | |
545 | if (rv == -ECONNRESET) | |
546 | dev_info(DEV, "sock was reset by peer\n"); | |
547 | else if (rv != -ERESTARTSYS) | |
548 | dev_err(DEV, "sock_recvmsg returned %d\n", rv); | |
549 | break; | |
550 | } else if (rv == 0) { | |
551 | dev_info(DEV, "sock was shut down by peer\n"); | |
552 | break; | |
553 | } else { | |
554 | /* signal came in, or peer/link went down, | |
555 | * after we read a partial message | |
556 | */ | |
557 | /* D_ASSERT(signal_pending(current)); */ | |
558 | break; | |
559 | } | |
560 | }; | |
561 | ||
562 | set_fs(oldfs); | |
563 | ||
564 | if (rv != size) | |
565 | drbd_force_state(mdev, NS(conn, C_BROKEN_PIPE)); | |
566 | ||
567 | return rv; | |
568 | } | |
569 | ||
570 | static struct socket *drbd_try_connect(struct drbd_conf *mdev) | |
571 | { | |
572 | const char *what; | |
573 | struct socket *sock; | |
574 | struct sockaddr_in6 src_in6; | |
575 | int err; | |
576 | int disconnect_on_error = 1; | |
577 | ||
578 | if (!get_net_conf(mdev)) | |
579 | return NULL; | |
580 | ||
581 | what = "sock_create_kern"; | |
582 | err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family, | |
583 | SOCK_STREAM, IPPROTO_TCP, &sock); | |
584 | if (err < 0) { | |
585 | sock = NULL; | |
586 | goto out; | |
587 | } | |
588 | ||
589 | sock->sk->sk_rcvtimeo = | |
590 | sock->sk->sk_sndtimeo = mdev->net_conf->try_connect_int*HZ; | |
591 | ||
592 | /* explicitly bind to the configured IP as source IP | |
593 | * for the outgoing connections. | |
594 | * This is needed for multihomed hosts and to be | |
595 | * able to use lo: interfaces for drbd. | |
596 | * Make sure to use 0 as port number, so linux selects | |
597 | * a free one dynamically. | |
598 | */ | |
599 | memcpy(&src_in6, mdev->net_conf->my_addr, | |
600 | min_t(int, mdev->net_conf->my_addr_len, sizeof(src_in6))); | |
601 | if (((struct sockaddr *)mdev->net_conf->my_addr)->sa_family == AF_INET6) | |
602 | src_in6.sin6_port = 0; | |
603 | else | |
604 | ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ | |
605 | ||
606 | what = "bind before connect"; | |
607 | err = sock->ops->bind(sock, | |
608 | (struct sockaddr *) &src_in6, | |
609 | mdev->net_conf->my_addr_len); | |
610 | if (err < 0) | |
611 | goto out; | |
612 | ||
613 | /* connect may fail, peer not yet available. | |
614 | * stay C_WF_CONNECTION, don't go Disconnecting! */ | |
615 | disconnect_on_error = 0; | |
616 | what = "connect"; | |
617 | err = sock->ops->connect(sock, | |
618 | (struct sockaddr *)mdev->net_conf->peer_addr, | |
619 | mdev->net_conf->peer_addr_len, 0); | |
620 | ||
621 | out: | |
622 | if (err < 0) { | |
623 | if (sock) { | |
624 | sock_release(sock); | |
625 | sock = NULL; | |
626 | } | |
627 | switch (-err) { | |
628 | /* timeout, busy, signal pending */ | |
629 | case ETIMEDOUT: case EAGAIN: case EINPROGRESS: | |
630 | case EINTR: case ERESTARTSYS: | |
631 | /* peer not (yet) available, network problem */ | |
632 | case ECONNREFUSED: case ENETUNREACH: | |
633 | case EHOSTDOWN: case EHOSTUNREACH: | |
634 | disconnect_on_error = 0; | |
635 | break; | |
636 | default: | |
637 | dev_err(DEV, "%s failed, err = %d\n", what, err); | |
638 | } | |
639 | if (disconnect_on_error) | |
640 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
641 | } | |
642 | put_net_conf(mdev); | |
643 | return sock; | |
644 | } | |
645 | ||
646 | static struct socket *drbd_wait_for_connect(struct drbd_conf *mdev) | |
647 | { | |
648 | int timeo, err; | |
649 | struct socket *s_estab = NULL, *s_listen; | |
650 | const char *what; | |
651 | ||
652 | if (!get_net_conf(mdev)) | |
653 | return NULL; | |
654 | ||
655 | what = "sock_create_kern"; | |
656 | err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family, | |
657 | SOCK_STREAM, IPPROTO_TCP, &s_listen); | |
658 | if (err) { | |
659 | s_listen = NULL; | |
660 | goto out; | |
661 | } | |
662 | ||
663 | timeo = mdev->net_conf->try_connect_int * HZ; | |
664 | timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */ | |
665 | ||
666 | s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */ | |
667 | s_listen->sk->sk_rcvtimeo = timeo; | |
668 | s_listen->sk->sk_sndtimeo = timeo; | |
669 | ||
670 | what = "bind before listen"; | |
671 | err = s_listen->ops->bind(s_listen, | |
672 | (struct sockaddr *) mdev->net_conf->my_addr, | |
673 | mdev->net_conf->my_addr_len); | |
674 | if (err < 0) | |
675 | goto out; | |
676 | ||
677 | err = drbd_accept(mdev, &what, s_listen, &s_estab); | |
678 | ||
679 | out: | |
680 | if (s_listen) | |
681 | sock_release(s_listen); | |
682 | if (err < 0) { | |
683 | if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { | |
684 | dev_err(DEV, "%s failed, err = %d\n", what, err); | |
685 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
686 | } | |
687 | } | |
688 | put_net_conf(mdev); | |
689 | ||
690 | return s_estab; | |
691 | } | |
692 | ||
693 | static int drbd_send_fp(struct drbd_conf *mdev, | |
694 | struct socket *sock, enum drbd_packets cmd) | |
695 | { | |
696 | struct p_header *h = (struct p_header *) &mdev->data.sbuf.header; | |
697 | ||
698 | return _drbd_send_cmd(mdev, sock, cmd, h, sizeof(*h), 0); | |
699 | } | |
700 | ||
701 | static enum drbd_packets drbd_recv_fp(struct drbd_conf *mdev, struct socket *sock) | |
702 | { | |
703 | struct p_header *h = (struct p_header *) &mdev->data.sbuf.header; | |
704 | int rr; | |
705 | ||
706 | rr = drbd_recv_short(mdev, sock, h, sizeof(*h), 0); | |
707 | ||
708 | if (rr == sizeof(*h) && h->magic == BE_DRBD_MAGIC) | |
709 | return be16_to_cpu(h->command); | |
710 | ||
711 | return 0xffff; | |
712 | } | |
713 | ||
714 | /** | |
715 | * drbd_socket_okay() - Free the socket if its connection is not okay | |
716 | * @mdev: DRBD device. | |
717 | * @sock: pointer to the pointer to the socket. | |
718 | */ | |
719 | static int drbd_socket_okay(struct drbd_conf *mdev, struct socket **sock) | |
720 | { | |
721 | int rr; | |
722 | char tb[4]; | |
723 | ||
724 | if (!*sock) | |
725 | return FALSE; | |
726 | ||
727 | rr = drbd_recv_short(mdev, *sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); | |
728 | ||
729 | if (rr > 0 || rr == -EAGAIN) { | |
730 | return TRUE; | |
731 | } else { | |
732 | sock_release(*sock); | |
733 | *sock = NULL; | |
734 | return FALSE; | |
735 | } | |
736 | } | |
737 | ||
738 | /* | |
739 | * return values: | |
740 | * 1 yes, we have a valid connection | |
741 | * 0 oops, did not work out, please try again | |
742 | * -1 peer talks different language, | |
743 | * no point in trying again, please go standalone. | |
744 | * -2 We do not have a network config... | |
745 | */ | |
746 | static int drbd_connect(struct drbd_conf *mdev) | |
747 | { | |
748 | struct socket *s, *sock, *msock; | |
749 | int try, h, ok; | |
750 | ||
751 | D_ASSERT(!mdev->data.socket); | |
752 | ||
753 | if (test_and_clear_bit(CREATE_BARRIER, &mdev->flags)) | |
754 | dev_err(DEV, "CREATE_BARRIER flag was set in drbd_connect - now cleared!\n"); | |
755 | ||
756 | if (drbd_request_state(mdev, NS(conn, C_WF_CONNECTION)) < SS_SUCCESS) | |
757 | return -2; | |
758 | ||
759 | clear_bit(DISCARD_CONCURRENT, &mdev->flags); | |
760 | ||
761 | sock = NULL; | |
762 | msock = NULL; | |
763 | ||
764 | do { | |
765 | for (try = 0;;) { | |
766 | /* 3 tries, this should take less than a second! */ | |
767 | s = drbd_try_connect(mdev); | |
768 | if (s || ++try >= 3) | |
769 | break; | |
770 | /* give the other side time to call bind() & listen() */ | |
771 | __set_current_state(TASK_INTERRUPTIBLE); | |
772 | schedule_timeout(HZ / 10); | |
773 | } | |
774 | ||
775 | if (s) { | |
776 | if (!sock) { | |
777 | drbd_send_fp(mdev, s, P_HAND_SHAKE_S); | |
778 | sock = s; | |
779 | s = NULL; | |
780 | } else if (!msock) { | |
781 | drbd_send_fp(mdev, s, P_HAND_SHAKE_M); | |
782 | msock = s; | |
783 | s = NULL; | |
784 | } else { | |
785 | dev_err(DEV, "Logic error in drbd_connect()\n"); | |
786 | goto out_release_sockets; | |
787 | } | |
788 | } | |
789 | ||
790 | if (sock && msock) { | |
791 | __set_current_state(TASK_INTERRUPTIBLE); | |
792 | schedule_timeout(HZ / 10); | |
793 | ok = drbd_socket_okay(mdev, &sock); | |
794 | ok = drbd_socket_okay(mdev, &msock) && ok; | |
795 | if (ok) | |
796 | break; | |
797 | } | |
798 | ||
799 | retry: | |
800 | s = drbd_wait_for_connect(mdev); | |
801 | if (s) { | |
802 | try = drbd_recv_fp(mdev, s); | |
803 | drbd_socket_okay(mdev, &sock); | |
804 | drbd_socket_okay(mdev, &msock); | |
805 | switch (try) { | |
806 | case P_HAND_SHAKE_S: | |
807 | if (sock) { | |
808 | dev_warn(DEV, "initial packet S crossed\n"); | |
809 | sock_release(sock); | |
810 | } | |
811 | sock = s; | |
812 | break; | |
813 | case P_HAND_SHAKE_M: | |
814 | if (msock) { | |
815 | dev_warn(DEV, "initial packet M crossed\n"); | |
816 | sock_release(msock); | |
817 | } | |
818 | msock = s; | |
819 | set_bit(DISCARD_CONCURRENT, &mdev->flags); | |
820 | break; | |
821 | default: | |
822 | dev_warn(DEV, "Error receiving initial packet\n"); | |
823 | sock_release(s); | |
824 | if (random32() & 1) | |
825 | goto retry; | |
826 | } | |
827 | } | |
828 | ||
829 | if (mdev->state.conn <= C_DISCONNECTING) | |
830 | goto out_release_sockets; | |
831 | if (signal_pending(current)) { | |
832 | flush_signals(current); | |
833 | smp_rmb(); | |
834 | if (get_t_state(&mdev->receiver) == Exiting) | |
835 | goto out_release_sockets; | |
836 | } | |
837 | ||
838 | if (sock && msock) { | |
839 | ok = drbd_socket_okay(mdev, &sock); | |
840 | ok = drbd_socket_okay(mdev, &msock) && ok; | |
841 | if (ok) | |
842 | break; | |
843 | } | |
844 | } while (1); | |
845 | ||
846 | msock->sk->sk_reuse = 1; /* SO_REUSEADDR */ | |
847 | sock->sk->sk_reuse = 1; /* SO_REUSEADDR */ | |
848 | ||
849 | sock->sk->sk_allocation = GFP_NOIO; | |
850 | msock->sk->sk_allocation = GFP_NOIO; | |
851 | ||
852 | sock->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; | |
853 | msock->sk->sk_priority = TC_PRIO_INTERACTIVE; | |
854 | ||
855 | if (mdev->net_conf->sndbuf_size) { | |
856 | sock->sk->sk_sndbuf = mdev->net_conf->sndbuf_size; | |
857 | sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; | |
858 | } | |
859 | ||
860 | if (mdev->net_conf->rcvbuf_size) { | |
861 | sock->sk->sk_rcvbuf = mdev->net_conf->rcvbuf_size; | |
862 | sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; | |
863 | } | |
864 | ||
865 | /* NOT YET ... | |
866 | * sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; | |
867 | * sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
868 | * first set it to the P_HAND_SHAKE timeout, | |
869 | * which we set to 4x the configured ping_timeout. */ | |
870 | sock->sk->sk_sndtimeo = | |
871 | sock->sk->sk_rcvtimeo = mdev->net_conf->ping_timeo*4*HZ/10; | |
872 | ||
873 | msock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; | |
874 | msock->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ; | |
875 | ||
876 | /* we don't want delays. | |
877 | * we use TCP_CORK where apropriate, though */ | |
878 | drbd_tcp_nodelay(sock); | |
879 | drbd_tcp_nodelay(msock); | |
880 | ||
881 | mdev->data.socket = sock; | |
882 | mdev->meta.socket = msock; | |
883 | mdev->last_received = jiffies; | |
884 | ||
885 | D_ASSERT(mdev->asender.task == NULL); | |
886 | ||
887 | h = drbd_do_handshake(mdev); | |
888 | if (h <= 0) | |
889 | return h; | |
890 | ||
891 | if (mdev->cram_hmac_tfm) { | |
892 | /* drbd_request_state(mdev, NS(conn, WFAuth)); */ | |
b10d96cb JT |
893 | switch (drbd_do_auth(mdev)) { |
894 | case -1: | |
b411b363 PR |
895 | dev_err(DEV, "Authentication of peer failed\n"); |
896 | return -1; | |
b10d96cb JT |
897 | case 0: |
898 | dev_err(DEV, "Authentication of peer failed, trying again.\n"); | |
899 | return 0; | |
b411b363 PR |
900 | } |
901 | } | |
902 | ||
903 | if (drbd_request_state(mdev, NS(conn, C_WF_REPORT_PARAMS)) < SS_SUCCESS) | |
904 | return 0; | |
905 | ||
906 | sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10; | |
907 | sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
908 | ||
909 | atomic_set(&mdev->packet_seq, 0); | |
910 | mdev->peer_seq = 0; | |
911 | ||
912 | drbd_thread_start(&mdev->asender); | |
913 | ||
7e2455c1 PR |
914 | if (!drbd_send_protocol(mdev)) |
915 | return -1; | |
b411b363 | 916 | drbd_send_sync_param(mdev, &mdev->sync_conf); |
e89b591c | 917 | drbd_send_sizes(mdev, 0, 0); |
b411b363 PR |
918 | drbd_send_uuids(mdev); |
919 | drbd_send_state(mdev); | |
920 | clear_bit(USE_DEGR_WFC_T, &mdev->flags); | |
921 | clear_bit(RESIZE_PENDING, &mdev->flags); | |
922 | ||
923 | return 1; | |
924 | ||
925 | out_release_sockets: | |
926 | if (sock) | |
927 | sock_release(sock); | |
928 | if (msock) | |
929 | sock_release(msock); | |
930 | return -1; | |
931 | } | |
932 | ||
933 | static int drbd_recv_header(struct drbd_conf *mdev, struct p_header *h) | |
934 | { | |
935 | int r; | |
936 | ||
937 | r = drbd_recv(mdev, h, sizeof(*h)); | |
938 | ||
939 | if (unlikely(r != sizeof(*h))) { | |
940 | dev_err(DEV, "short read expecting header on sock: r=%d\n", r); | |
941 | return FALSE; | |
942 | }; | |
943 | h->command = be16_to_cpu(h->command); | |
944 | h->length = be16_to_cpu(h->length); | |
945 | if (unlikely(h->magic != BE_DRBD_MAGIC)) { | |
946 | dev_err(DEV, "magic?? on data m: 0x%lx c: %d l: %d\n", | |
947 | (long)be32_to_cpu(h->magic), | |
948 | h->command, h->length); | |
949 | return FALSE; | |
950 | } | |
951 | mdev->last_received = jiffies; | |
952 | ||
953 | return TRUE; | |
954 | } | |
955 | ||
956 | static enum finish_epoch drbd_flush_after_epoch(struct drbd_conf *mdev, struct drbd_epoch *epoch) | |
957 | { | |
958 | int rv; | |
959 | ||
960 | if (mdev->write_ordering >= WO_bdev_flush && get_ldev(mdev)) { | |
fbd9b09a DM |
961 | rv = blkdev_issue_flush(mdev->ldev->backing_bdev, GFP_KERNEL, |
962 | NULL, BLKDEV_IFL_WAIT); | |
b411b363 PR |
963 | if (rv) { |
964 | dev_err(DEV, "local disk flush failed with status %d\n", rv); | |
965 | /* would rather check on EOPNOTSUPP, but that is not reliable. | |
966 | * don't try again for ANY return value != 0 | |
967 | * if (rv == -EOPNOTSUPP) */ | |
968 | drbd_bump_write_ordering(mdev, WO_drain_io); | |
969 | } | |
970 | put_ldev(mdev); | |
971 | } | |
972 | ||
973 | return drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE); | |
974 | } | |
975 | ||
976 | static int w_flush(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
977 | { | |
978 | struct flush_work *fw = (struct flush_work *)w; | |
979 | struct drbd_epoch *epoch = fw->epoch; | |
980 | ||
981 | kfree(w); | |
982 | ||
983 | if (!test_and_set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags)) | |
984 | drbd_flush_after_epoch(mdev, epoch); | |
985 | ||
986 | drbd_may_finish_epoch(mdev, epoch, EV_PUT | | |
987 | (mdev->state.conn < C_CONNECTED ? EV_CLEANUP : 0)); | |
988 | ||
989 | return 1; | |
990 | } | |
991 | ||
992 | /** | |
993 | * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. | |
994 | * @mdev: DRBD device. | |
995 | * @epoch: Epoch object. | |
996 | * @ev: Epoch event. | |
997 | */ | |
998 | static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev, | |
999 | struct drbd_epoch *epoch, | |
1000 | enum epoch_event ev) | |
1001 | { | |
1002 | int finish, epoch_size; | |
1003 | struct drbd_epoch *next_epoch; | |
1004 | int schedule_flush = 0; | |
1005 | enum finish_epoch rv = FE_STILL_LIVE; | |
1006 | ||
1007 | spin_lock(&mdev->epoch_lock); | |
1008 | do { | |
1009 | next_epoch = NULL; | |
1010 | finish = 0; | |
1011 | ||
1012 | epoch_size = atomic_read(&epoch->epoch_size); | |
1013 | ||
1014 | switch (ev & ~EV_CLEANUP) { | |
1015 | case EV_PUT: | |
1016 | atomic_dec(&epoch->active); | |
1017 | break; | |
1018 | case EV_GOT_BARRIER_NR: | |
1019 | set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); | |
1020 | ||
1021 | /* Special case: If we just switched from WO_bio_barrier to | |
1022 | WO_bdev_flush we should not finish the current epoch */ | |
1023 | if (test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags) && epoch_size == 1 && | |
1024 | mdev->write_ordering != WO_bio_barrier && | |
1025 | epoch == mdev->current_epoch) | |
1026 | clear_bit(DE_CONTAINS_A_BARRIER, &epoch->flags); | |
1027 | break; | |
1028 | case EV_BARRIER_DONE: | |
1029 | set_bit(DE_BARRIER_IN_NEXT_EPOCH_DONE, &epoch->flags); | |
1030 | break; | |
1031 | case EV_BECAME_LAST: | |
1032 | /* nothing to do*/ | |
1033 | break; | |
1034 | } | |
1035 | ||
b411b363 PR |
1036 | if (epoch_size != 0 && |
1037 | atomic_read(&epoch->active) == 0 && | |
1038 | test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags) && | |
1039 | epoch->list.prev == &mdev->current_epoch->list && | |
1040 | !test_bit(DE_IS_FINISHING, &epoch->flags)) { | |
1041 | /* Nearly all conditions are met to finish that epoch... */ | |
1042 | if (test_bit(DE_BARRIER_IN_NEXT_EPOCH_DONE, &epoch->flags) || | |
1043 | mdev->write_ordering == WO_none || | |
1044 | (epoch_size == 1 && test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags)) || | |
1045 | ev & EV_CLEANUP) { | |
1046 | finish = 1; | |
1047 | set_bit(DE_IS_FINISHING, &epoch->flags); | |
1048 | } else if (!test_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags) && | |
1049 | mdev->write_ordering == WO_bio_barrier) { | |
1050 | atomic_inc(&epoch->active); | |
1051 | schedule_flush = 1; | |
1052 | } | |
1053 | } | |
1054 | if (finish) { | |
1055 | if (!(ev & EV_CLEANUP)) { | |
1056 | spin_unlock(&mdev->epoch_lock); | |
1057 | drbd_send_b_ack(mdev, epoch->barrier_nr, epoch_size); | |
1058 | spin_lock(&mdev->epoch_lock); | |
1059 | } | |
1060 | dec_unacked(mdev); | |
1061 | ||
1062 | if (mdev->current_epoch != epoch) { | |
1063 | next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); | |
1064 | list_del(&epoch->list); | |
1065 | ev = EV_BECAME_LAST | (ev & EV_CLEANUP); | |
1066 | mdev->epochs--; | |
b411b363 PR |
1067 | kfree(epoch); |
1068 | ||
1069 | if (rv == FE_STILL_LIVE) | |
1070 | rv = FE_DESTROYED; | |
1071 | } else { | |
1072 | epoch->flags = 0; | |
1073 | atomic_set(&epoch->epoch_size, 0); | |
1074 | /* atomic_set(&epoch->active, 0); is alrady zero */ | |
1075 | if (rv == FE_STILL_LIVE) | |
1076 | rv = FE_RECYCLED; | |
1077 | } | |
1078 | } | |
1079 | ||
1080 | if (!next_epoch) | |
1081 | break; | |
1082 | ||
1083 | epoch = next_epoch; | |
1084 | } while (1); | |
1085 | ||
1086 | spin_unlock(&mdev->epoch_lock); | |
1087 | ||
1088 | if (schedule_flush) { | |
1089 | struct flush_work *fw; | |
1090 | fw = kmalloc(sizeof(*fw), GFP_ATOMIC); | |
1091 | if (fw) { | |
b411b363 PR |
1092 | fw->w.cb = w_flush; |
1093 | fw->epoch = epoch; | |
1094 | drbd_queue_work(&mdev->data.work, &fw->w); | |
1095 | } else { | |
1096 | dev_warn(DEV, "Could not kmalloc a flush_work obj\n"); | |
1097 | set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags); | |
1098 | /* That is not a recursion, only one level */ | |
1099 | drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE); | |
1100 | drbd_may_finish_epoch(mdev, epoch, EV_PUT); | |
1101 | } | |
1102 | } | |
1103 | ||
1104 | return rv; | |
1105 | } | |
1106 | ||
1107 | /** | |
1108 | * drbd_bump_write_ordering() - Fall back to an other write ordering method | |
1109 | * @mdev: DRBD device. | |
1110 | * @wo: Write ordering method to try. | |
1111 | */ | |
1112 | void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo) __must_hold(local) | |
1113 | { | |
1114 | enum write_ordering_e pwo; | |
1115 | static char *write_ordering_str[] = { | |
1116 | [WO_none] = "none", | |
1117 | [WO_drain_io] = "drain", | |
1118 | [WO_bdev_flush] = "flush", | |
1119 | [WO_bio_barrier] = "barrier", | |
1120 | }; | |
1121 | ||
1122 | pwo = mdev->write_ordering; | |
1123 | wo = min(pwo, wo); | |
1124 | if (wo == WO_bio_barrier && mdev->ldev->dc.no_disk_barrier) | |
1125 | wo = WO_bdev_flush; | |
1126 | if (wo == WO_bdev_flush && mdev->ldev->dc.no_disk_flush) | |
1127 | wo = WO_drain_io; | |
1128 | if (wo == WO_drain_io && mdev->ldev->dc.no_disk_drain) | |
1129 | wo = WO_none; | |
1130 | mdev->write_ordering = wo; | |
1131 | if (pwo != mdev->write_ordering || wo == WO_bio_barrier) | |
1132 | dev_info(DEV, "Method to ensure write ordering: %s\n", write_ordering_str[mdev->write_ordering]); | |
1133 | } | |
1134 | ||
45bb912b LE |
1135 | /** |
1136 | * drbd_submit_ee() | |
1137 | * @mdev: DRBD device. | |
1138 | * @e: epoch entry | |
1139 | * @rw: flag field, see bio->bi_rw | |
1140 | */ | |
1141 | /* TODO allocate from our own bio_set. */ | |
1142 | int drbd_submit_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e, | |
1143 | const unsigned rw, const int fault_type) | |
1144 | { | |
1145 | struct bio *bios = NULL; | |
1146 | struct bio *bio; | |
1147 | struct page *page = e->pages; | |
1148 | sector_t sector = e->sector; | |
1149 | unsigned ds = e->size; | |
1150 | unsigned n_bios = 0; | |
1151 | unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT; | |
1152 | ||
0c3f3451 PR |
1153 | if (atomic_read(&mdev->new_c_uuid)) { |
1154 | if (atomic_add_unless(&mdev->new_c_uuid, -1, 1)) { | |
1155 | drbd_uuid_new_current(mdev); | |
1156 | drbd_md_sync(mdev); | |
1157 | ||
1158 | atomic_dec(&mdev->new_c_uuid); | |
1159 | wake_up(&mdev->misc_wait); | |
1160 | } | |
1161 | wait_event(mdev->misc_wait, !atomic_read(&mdev->new_c_uuid)); | |
1162 | } | |
1163 | ||
45bb912b LE |
1164 | /* In most cases, we will only need one bio. But in case the lower |
1165 | * level restrictions happen to be different at this offset on this | |
1166 | * side than those of the sending peer, we may need to submit the | |
1167 | * request in more than one bio. */ | |
1168 | next_bio: | |
1169 | bio = bio_alloc(GFP_NOIO, nr_pages); | |
1170 | if (!bio) { | |
1171 | dev_err(DEV, "submit_ee: Allocation of a bio failed\n"); | |
1172 | goto fail; | |
1173 | } | |
1174 | /* > e->sector, unless this is the first bio */ | |
1175 | bio->bi_sector = sector; | |
1176 | bio->bi_bdev = mdev->ldev->backing_bdev; | |
1177 | /* we special case some flags in the multi-bio case, see below | |
1178 | * (BIO_RW_UNPLUG, BIO_RW_BARRIER) */ | |
1179 | bio->bi_rw = rw; | |
1180 | bio->bi_private = e; | |
1181 | bio->bi_end_io = drbd_endio_sec; | |
1182 | ||
1183 | bio->bi_next = bios; | |
1184 | bios = bio; | |
1185 | ++n_bios; | |
1186 | ||
1187 | page_chain_for_each(page) { | |
1188 | unsigned len = min_t(unsigned, ds, PAGE_SIZE); | |
1189 | if (!bio_add_page(bio, page, len, 0)) { | |
1190 | /* a single page must always be possible! */ | |
1191 | BUG_ON(bio->bi_vcnt == 0); | |
1192 | goto next_bio; | |
1193 | } | |
1194 | ds -= len; | |
1195 | sector += len >> 9; | |
1196 | --nr_pages; | |
1197 | } | |
1198 | D_ASSERT(page == NULL); | |
1199 | D_ASSERT(ds == 0); | |
1200 | ||
1201 | atomic_set(&e->pending_bios, n_bios); | |
1202 | do { | |
1203 | bio = bios; | |
1204 | bios = bios->bi_next; | |
1205 | bio->bi_next = NULL; | |
1206 | ||
1207 | /* strip off BIO_RW_UNPLUG unless it is the last bio */ | |
1208 | if (bios) | |
1209 | bio->bi_rw &= ~(1<<BIO_RW_UNPLUG); | |
1210 | ||
1211 | drbd_generic_make_request(mdev, fault_type, bio); | |
1212 | ||
1213 | /* strip off BIO_RW_BARRIER, | |
1214 | * unless it is the first or last bio */ | |
1215 | if (bios && bios->bi_next) | |
1216 | bios->bi_rw &= ~(1<<BIO_RW_BARRIER); | |
1217 | } while (bios); | |
1218 | maybe_kick_lo(mdev); | |
1219 | return 0; | |
1220 | ||
1221 | fail: | |
1222 | while (bios) { | |
1223 | bio = bios; | |
1224 | bios = bios->bi_next; | |
1225 | bio_put(bio); | |
1226 | } | |
1227 | return -ENOMEM; | |
1228 | } | |
1229 | ||
b411b363 PR |
1230 | /** |
1231 | * w_e_reissue() - Worker callback; Resubmit a bio, without BIO_RW_BARRIER set | |
1232 | * @mdev: DRBD device. | |
1233 | * @w: work object. | |
1234 | * @cancel: The connection will be closed anyways (unused in this callback) | |
1235 | */ | |
1236 | int w_e_reissue(struct drbd_conf *mdev, struct drbd_work *w, int cancel) __releases(local) | |
1237 | { | |
1238 | struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; | |
b411b363 PR |
1239 | /* We leave DE_CONTAINS_A_BARRIER and EE_IS_BARRIER in place, |
1240 | (and DE_BARRIER_IN_NEXT_EPOCH_ISSUED in the previous Epoch) | |
1241 | so that we can finish that epoch in drbd_may_finish_epoch(). | |
1242 | That is necessary if we already have a long chain of Epochs, before | |
1243 | we realize that BIO_RW_BARRIER is actually not supported */ | |
1244 | ||
1245 | /* As long as the -ENOTSUPP on the barrier is reported immediately | |
1246 | that will never trigger. If it is reported late, we will just | |
1247 | print that warning and continue correctly for all future requests | |
1248 | with WO_bdev_flush */ | |
1249 | if (previous_epoch(mdev, e->epoch)) | |
1250 | dev_warn(DEV, "Write ordering was not enforced (one time event)\n"); | |
1251 | ||
b411b363 PR |
1252 | /* we still have a local reference, |
1253 | * get_ldev was done in receive_Data. */ | |
b411b363 PR |
1254 | |
1255 | e->w.cb = e_end_block; | |
45bb912b LE |
1256 | if (drbd_submit_ee(mdev, e, WRITE, DRBD_FAULT_DT_WR) != 0) { |
1257 | /* drbd_submit_ee fails for one reason only: | |
1258 | * if was not able to allocate sufficient bios. | |
1259 | * requeue, try again later. */ | |
1260 | e->w.cb = w_e_reissue; | |
1261 | drbd_queue_work(&mdev->data.work, &e->w); | |
1262 | } | |
b411b363 PR |
1263 | return 1; |
1264 | } | |
1265 | ||
1266 | static int receive_Barrier(struct drbd_conf *mdev, struct p_header *h) | |
1267 | { | |
1268 | int rv, issue_flush; | |
1269 | struct p_barrier *p = (struct p_barrier *)h; | |
1270 | struct drbd_epoch *epoch; | |
1271 | ||
1272 | ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; | |
1273 | ||
1274 | rv = drbd_recv(mdev, h->payload, h->length); | |
1275 | ERR_IF(rv != h->length) return FALSE; | |
1276 | ||
1277 | inc_unacked(mdev); | |
1278 | ||
1279 | if (mdev->net_conf->wire_protocol != DRBD_PROT_C) | |
1280 | drbd_kick_lo(mdev); | |
1281 | ||
1282 | mdev->current_epoch->barrier_nr = p->barrier; | |
1283 | rv = drbd_may_finish_epoch(mdev, mdev->current_epoch, EV_GOT_BARRIER_NR); | |
1284 | ||
1285 | /* P_BARRIER_ACK may imply that the corresponding extent is dropped from | |
1286 | * the activity log, which means it would not be resynced in case the | |
1287 | * R_PRIMARY crashes now. | |
1288 | * Therefore we must send the barrier_ack after the barrier request was | |
1289 | * completed. */ | |
1290 | switch (mdev->write_ordering) { | |
1291 | case WO_bio_barrier: | |
1292 | case WO_none: | |
1293 | if (rv == FE_RECYCLED) | |
1294 | return TRUE; | |
1295 | break; | |
1296 | ||
1297 | case WO_bdev_flush: | |
1298 | case WO_drain_io: | |
367a8d73 PR |
1299 | if (rv == FE_STILL_LIVE) { |
1300 | set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &mdev->current_epoch->flags); | |
1301 | drbd_wait_ee_list_empty(mdev, &mdev->active_ee); | |
1302 | rv = drbd_flush_after_epoch(mdev, mdev->current_epoch); | |
1303 | } | |
b411b363 PR |
1304 | if (rv == FE_RECYCLED) |
1305 | return TRUE; | |
1306 | ||
1307 | /* The asender will send all the ACKs and barrier ACKs out, since | |
1308 | all EEs moved from the active_ee to the done_ee. We need to | |
1309 | provide a new epoch object for the EEs that come in soon */ | |
1310 | break; | |
1311 | } | |
1312 | ||
1313 | /* receiver context, in the writeout path of the other node. | |
1314 | * avoid potential distributed deadlock */ | |
1315 | epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); | |
1316 | if (!epoch) { | |
1317 | dev_warn(DEV, "Allocation of an epoch failed, slowing down\n"); | |
d3db7b48 | 1318 | issue_flush = !test_and_set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &mdev->current_epoch->flags); |
b411b363 PR |
1319 | drbd_wait_ee_list_empty(mdev, &mdev->active_ee); |
1320 | if (issue_flush) { | |
1321 | rv = drbd_flush_after_epoch(mdev, mdev->current_epoch); | |
1322 | if (rv == FE_RECYCLED) | |
1323 | return TRUE; | |
1324 | } | |
1325 | ||
1326 | drbd_wait_ee_list_empty(mdev, &mdev->done_ee); | |
1327 | ||
1328 | return TRUE; | |
1329 | } | |
1330 | ||
1331 | epoch->flags = 0; | |
1332 | atomic_set(&epoch->epoch_size, 0); | |
1333 | atomic_set(&epoch->active, 0); | |
1334 | ||
1335 | spin_lock(&mdev->epoch_lock); | |
1336 | if (atomic_read(&mdev->current_epoch->epoch_size)) { | |
1337 | list_add(&epoch->list, &mdev->current_epoch->list); | |
1338 | mdev->current_epoch = epoch; | |
1339 | mdev->epochs++; | |
b411b363 PR |
1340 | } else { |
1341 | /* The current_epoch got recycled while we allocated this one... */ | |
1342 | kfree(epoch); | |
1343 | } | |
1344 | spin_unlock(&mdev->epoch_lock); | |
1345 | ||
1346 | return TRUE; | |
1347 | } | |
1348 | ||
1349 | /* used from receive_RSDataReply (recv_resync_read) | |
1350 | * and from receive_Data */ | |
1351 | static struct drbd_epoch_entry * | |
1352 | read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, int data_size) __must_hold(local) | |
1353 | { | |
6666032a | 1354 | const sector_t capacity = drbd_get_capacity(mdev->this_bdev); |
b411b363 | 1355 | struct drbd_epoch_entry *e; |
b411b363 | 1356 | struct page *page; |
45bb912b | 1357 | int dgs, ds, rr; |
b411b363 PR |
1358 | void *dig_in = mdev->int_dig_in; |
1359 | void *dig_vv = mdev->int_dig_vv; | |
6b4388ac | 1360 | unsigned long *data; |
b411b363 PR |
1361 | |
1362 | dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ? | |
1363 | crypto_hash_digestsize(mdev->integrity_r_tfm) : 0; | |
1364 | ||
1365 | if (dgs) { | |
1366 | rr = drbd_recv(mdev, dig_in, dgs); | |
1367 | if (rr != dgs) { | |
1368 | dev_warn(DEV, "short read receiving data digest: read %d expected %d\n", | |
1369 | rr, dgs); | |
1370 | return NULL; | |
1371 | } | |
1372 | } | |
1373 | ||
1374 | data_size -= dgs; | |
1375 | ||
1376 | ERR_IF(data_size & 0x1ff) return NULL; | |
1377 | ERR_IF(data_size > DRBD_MAX_SEGMENT_SIZE) return NULL; | |
1378 | ||
6666032a LE |
1379 | /* even though we trust out peer, |
1380 | * we sometimes have to double check. */ | |
1381 | if (sector + (data_size>>9) > capacity) { | |
1382 | dev_err(DEV, "capacity: %llus < sector: %llus + size: %u\n", | |
1383 | (unsigned long long)capacity, | |
1384 | (unsigned long long)sector, data_size); | |
1385 | return NULL; | |
1386 | } | |
1387 | ||
b411b363 PR |
1388 | /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD |
1389 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
1390 | * which in turn might block on the other node at this very place. */ | |
1391 | e = drbd_alloc_ee(mdev, id, sector, data_size, GFP_NOIO); | |
1392 | if (!e) | |
1393 | return NULL; | |
45bb912b | 1394 | |
b411b363 | 1395 | ds = data_size; |
45bb912b LE |
1396 | page = e->pages; |
1397 | page_chain_for_each(page) { | |
1398 | unsigned len = min_t(int, ds, PAGE_SIZE); | |
6b4388ac | 1399 | data = kmap(page); |
45bb912b | 1400 | rr = drbd_recv(mdev, data, len); |
6b4388ac PR |
1401 | if (FAULT_ACTIVE(mdev, DRBD_FAULT_RECEIVE)) { |
1402 | dev_err(DEV, "Fault injection: Corrupting data on receive\n"); | |
1403 | data[0] = data[0] ^ (unsigned long)-1; | |
1404 | } | |
b411b363 | 1405 | kunmap(page); |
45bb912b | 1406 | if (rr != len) { |
b411b363 PR |
1407 | drbd_free_ee(mdev, e); |
1408 | dev_warn(DEV, "short read receiving data: read %d expected %d\n", | |
45bb912b | 1409 | rr, len); |
b411b363 PR |
1410 | return NULL; |
1411 | } | |
1412 | ds -= rr; | |
1413 | } | |
1414 | ||
1415 | if (dgs) { | |
45bb912b | 1416 | drbd_csum_ee(mdev, mdev->integrity_r_tfm, e, dig_vv); |
b411b363 PR |
1417 | if (memcmp(dig_in, dig_vv, dgs)) { |
1418 | dev_err(DEV, "Digest integrity check FAILED.\n"); | |
1419 | drbd_bcast_ee(mdev, "digest failed", | |
1420 | dgs, dig_in, dig_vv, e); | |
1421 | drbd_free_ee(mdev, e); | |
1422 | return NULL; | |
1423 | } | |
1424 | } | |
1425 | mdev->recv_cnt += data_size>>9; | |
1426 | return e; | |
1427 | } | |
1428 | ||
1429 | /* drbd_drain_block() just takes a data block | |
1430 | * out of the socket input buffer, and discards it. | |
1431 | */ | |
1432 | static int drbd_drain_block(struct drbd_conf *mdev, int data_size) | |
1433 | { | |
1434 | struct page *page; | |
1435 | int rr, rv = 1; | |
1436 | void *data; | |
1437 | ||
c3470cde LE |
1438 | if (!data_size) |
1439 | return TRUE; | |
1440 | ||
45bb912b | 1441 | page = drbd_pp_alloc(mdev, 1, 1); |
b411b363 PR |
1442 | |
1443 | data = kmap(page); | |
1444 | while (data_size) { | |
1445 | rr = drbd_recv(mdev, data, min_t(int, data_size, PAGE_SIZE)); | |
1446 | if (rr != min_t(int, data_size, PAGE_SIZE)) { | |
1447 | rv = 0; | |
1448 | dev_warn(DEV, "short read receiving data: read %d expected %d\n", | |
1449 | rr, min_t(int, data_size, PAGE_SIZE)); | |
1450 | break; | |
1451 | } | |
1452 | data_size -= rr; | |
1453 | } | |
1454 | kunmap(page); | |
1455 | drbd_pp_free(mdev, page); | |
1456 | return rv; | |
1457 | } | |
1458 | ||
1459 | static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req, | |
1460 | sector_t sector, int data_size) | |
1461 | { | |
1462 | struct bio_vec *bvec; | |
1463 | struct bio *bio; | |
1464 | int dgs, rr, i, expect; | |
1465 | void *dig_in = mdev->int_dig_in; | |
1466 | void *dig_vv = mdev->int_dig_vv; | |
1467 | ||
1468 | dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ? | |
1469 | crypto_hash_digestsize(mdev->integrity_r_tfm) : 0; | |
1470 | ||
1471 | if (dgs) { | |
1472 | rr = drbd_recv(mdev, dig_in, dgs); | |
1473 | if (rr != dgs) { | |
1474 | dev_warn(DEV, "short read receiving data reply digest: read %d expected %d\n", | |
1475 | rr, dgs); | |
1476 | return 0; | |
1477 | } | |
1478 | } | |
1479 | ||
1480 | data_size -= dgs; | |
1481 | ||
1482 | /* optimistically update recv_cnt. if receiving fails below, | |
1483 | * we disconnect anyways, and counters will be reset. */ | |
1484 | mdev->recv_cnt += data_size>>9; | |
1485 | ||
1486 | bio = req->master_bio; | |
1487 | D_ASSERT(sector == bio->bi_sector); | |
1488 | ||
1489 | bio_for_each_segment(bvec, bio, i) { | |
1490 | expect = min_t(int, data_size, bvec->bv_len); | |
1491 | rr = drbd_recv(mdev, | |
1492 | kmap(bvec->bv_page)+bvec->bv_offset, | |
1493 | expect); | |
1494 | kunmap(bvec->bv_page); | |
1495 | if (rr != expect) { | |
1496 | dev_warn(DEV, "short read receiving data reply: " | |
1497 | "read %d expected %d\n", | |
1498 | rr, expect); | |
1499 | return 0; | |
1500 | } | |
1501 | data_size -= rr; | |
1502 | } | |
1503 | ||
1504 | if (dgs) { | |
45bb912b | 1505 | drbd_csum_bio(mdev, mdev->integrity_r_tfm, bio, dig_vv); |
b411b363 PR |
1506 | if (memcmp(dig_in, dig_vv, dgs)) { |
1507 | dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n"); | |
1508 | return 0; | |
1509 | } | |
1510 | } | |
1511 | ||
1512 | D_ASSERT(data_size == 0); | |
1513 | return 1; | |
1514 | } | |
1515 | ||
1516 | /* e_end_resync_block() is called via | |
1517 | * drbd_process_done_ee() by asender only */ | |
1518 | static int e_end_resync_block(struct drbd_conf *mdev, struct drbd_work *w, int unused) | |
1519 | { | |
1520 | struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; | |
1521 | sector_t sector = e->sector; | |
1522 | int ok; | |
1523 | ||
1524 | D_ASSERT(hlist_unhashed(&e->colision)); | |
1525 | ||
45bb912b | 1526 | if (likely((e->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
1527 | drbd_set_in_sync(mdev, sector, e->size); |
1528 | ok = drbd_send_ack(mdev, P_RS_WRITE_ACK, e); | |
1529 | } else { | |
1530 | /* Record failure to sync */ | |
1531 | drbd_rs_failed_io(mdev, sector, e->size); | |
1532 | ||
1533 | ok = drbd_send_ack(mdev, P_NEG_ACK, e); | |
1534 | } | |
1535 | dec_unacked(mdev); | |
1536 | ||
1537 | return ok; | |
1538 | } | |
1539 | ||
1540 | static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local) | |
1541 | { | |
1542 | struct drbd_epoch_entry *e; | |
1543 | ||
1544 | e = read_in_block(mdev, ID_SYNCER, sector, data_size); | |
45bb912b LE |
1545 | if (!e) |
1546 | goto fail; | |
b411b363 PR |
1547 | |
1548 | dec_rs_pending(mdev); | |
1549 | ||
b411b363 PR |
1550 | inc_unacked(mdev); |
1551 | /* corresponding dec_unacked() in e_end_resync_block() | |
1552 | * respective _drbd_clear_done_ee */ | |
1553 | ||
45bb912b LE |
1554 | e->w.cb = e_end_resync_block; |
1555 | ||
b411b363 PR |
1556 | spin_lock_irq(&mdev->req_lock); |
1557 | list_add(&e->w.list, &mdev->sync_ee); | |
1558 | spin_unlock_irq(&mdev->req_lock); | |
1559 | ||
45bb912b LE |
1560 | if (drbd_submit_ee(mdev, e, WRITE, DRBD_FAULT_RS_WR) == 0) |
1561 | return TRUE; | |
b411b363 | 1562 | |
45bb912b LE |
1563 | drbd_free_ee(mdev, e); |
1564 | fail: | |
1565 | put_ldev(mdev); | |
1566 | return FALSE; | |
b411b363 PR |
1567 | } |
1568 | ||
1569 | static int receive_DataReply(struct drbd_conf *mdev, struct p_header *h) | |
1570 | { | |
1571 | struct drbd_request *req; | |
1572 | sector_t sector; | |
1573 | unsigned int header_size, data_size; | |
1574 | int ok; | |
1575 | struct p_data *p = (struct p_data *)h; | |
1576 | ||
1577 | header_size = sizeof(*p) - sizeof(*h); | |
1578 | data_size = h->length - header_size; | |
1579 | ||
1580 | ERR_IF(data_size == 0) return FALSE; | |
1581 | ||
1582 | if (drbd_recv(mdev, h->payload, header_size) != header_size) | |
1583 | return FALSE; | |
1584 | ||
1585 | sector = be64_to_cpu(p->sector); | |
1586 | ||
1587 | spin_lock_irq(&mdev->req_lock); | |
1588 | req = _ar_id_to_req(mdev, p->block_id, sector); | |
1589 | spin_unlock_irq(&mdev->req_lock); | |
1590 | if (unlikely(!req)) { | |
1591 | dev_err(DEV, "Got a corrupt block_id/sector pair(1).\n"); | |
1592 | return FALSE; | |
1593 | } | |
1594 | ||
1595 | /* hlist_del(&req->colision) is done in _req_may_be_done, to avoid | |
1596 | * special casing it there for the various failure cases. | |
1597 | * still no race with drbd_fail_pending_reads */ | |
1598 | ok = recv_dless_read(mdev, req, sector, data_size); | |
1599 | ||
1600 | if (ok) | |
1601 | req_mod(req, data_received); | |
1602 | /* else: nothing. handled from drbd_disconnect... | |
1603 | * I don't think we may complete this just yet | |
1604 | * in case we are "on-disconnect: freeze" */ | |
1605 | ||
1606 | return ok; | |
1607 | } | |
1608 | ||
1609 | static int receive_RSDataReply(struct drbd_conf *mdev, struct p_header *h) | |
1610 | { | |
1611 | sector_t sector; | |
1612 | unsigned int header_size, data_size; | |
1613 | int ok; | |
1614 | struct p_data *p = (struct p_data *)h; | |
1615 | ||
1616 | header_size = sizeof(*p) - sizeof(*h); | |
1617 | data_size = h->length - header_size; | |
1618 | ||
1619 | ERR_IF(data_size == 0) return FALSE; | |
1620 | ||
1621 | if (drbd_recv(mdev, h->payload, header_size) != header_size) | |
1622 | return FALSE; | |
1623 | ||
1624 | sector = be64_to_cpu(p->sector); | |
1625 | D_ASSERT(p->block_id == ID_SYNCER); | |
1626 | ||
1627 | if (get_ldev(mdev)) { | |
1628 | /* data is submitted to disk within recv_resync_read. | |
1629 | * corresponding put_ldev done below on error, | |
1630 | * or in drbd_endio_write_sec. */ | |
1631 | ok = recv_resync_read(mdev, sector, data_size); | |
1632 | } else { | |
1633 | if (__ratelimit(&drbd_ratelimit_state)) | |
1634 | dev_err(DEV, "Can not write resync data to local disk.\n"); | |
1635 | ||
1636 | ok = drbd_drain_block(mdev, data_size); | |
1637 | ||
1638 | drbd_send_ack_dp(mdev, P_NEG_ACK, p); | |
1639 | } | |
1640 | ||
1641 | return ok; | |
1642 | } | |
1643 | ||
1644 | /* e_end_block() is called via drbd_process_done_ee(). | |
1645 | * this means this function only runs in the asender thread | |
1646 | */ | |
1647 | static int e_end_block(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1648 | { | |
1649 | struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; | |
1650 | sector_t sector = e->sector; | |
1651 | struct drbd_epoch *epoch; | |
1652 | int ok = 1, pcmd; | |
1653 | ||
1654 | if (e->flags & EE_IS_BARRIER) { | |
1655 | epoch = previous_epoch(mdev, e->epoch); | |
1656 | if (epoch) | |
1657 | drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE + (cancel ? EV_CLEANUP : 0)); | |
1658 | } | |
1659 | ||
1660 | if (mdev->net_conf->wire_protocol == DRBD_PROT_C) { | |
45bb912b | 1661 | if (likely((e->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
1662 | pcmd = (mdev->state.conn >= C_SYNC_SOURCE && |
1663 | mdev->state.conn <= C_PAUSED_SYNC_T && | |
1664 | e->flags & EE_MAY_SET_IN_SYNC) ? | |
1665 | P_RS_WRITE_ACK : P_WRITE_ACK; | |
1666 | ok &= drbd_send_ack(mdev, pcmd, e); | |
1667 | if (pcmd == P_RS_WRITE_ACK) | |
1668 | drbd_set_in_sync(mdev, sector, e->size); | |
1669 | } else { | |
1670 | ok = drbd_send_ack(mdev, P_NEG_ACK, e); | |
1671 | /* we expect it to be marked out of sync anyways... | |
1672 | * maybe assert this? */ | |
1673 | } | |
1674 | dec_unacked(mdev); | |
1675 | } | |
1676 | /* we delete from the conflict detection hash _after_ we sent out the | |
1677 | * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ | |
1678 | if (mdev->net_conf->two_primaries) { | |
1679 | spin_lock_irq(&mdev->req_lock); | |
1680 | D_ASSERT(!hlist_unhashed(&e->colision)); | |
1681 | hlist_del_init(&e->colision); | |
1682 | spin_unlock_irq(&mdev->req_lock); | |
1683 | } else { | |
1684 | D_ASSERT(hlist_unhashed(&e->colision)); | |
1685 | } | |
1686 | ||
1687 | drbd_may_finish_epoch(mdev, e->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); | |
1688 | ||
1689 | return ok; | |
1690 | } | |
1691 | ||
1692 | static int e_send_discard_ack(struct drbd_conf *mdev, struct drbd_work *w, int unused) | |
1693 | { | |
1694 | struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w; | |
1695 | int ok = 1; | |
1696 | ||
1697 | D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); | |
1698 | ok = drbd_send_ack(mdev, P_DISCARD_ACK, e); | |
1699 | ||
1700 | spin_lock_irq(&mdev->req_lock); | |
1701 | D_ASSERT(!hlist_unhashed(&e->colision)); | |
1702 | hlist_del_init(&e->colision); | |
1703 | spin_unlock_irq(&mdev->req_lock); | |
1704 | ||
1705 | dec_unacked(mdev); | |
1706 | ||
1707 | return ok; | |
1708 | } | |
1709 | ||
1710 | /* Called from receive_Data. | |
1711 | * Synchronize packets on sock with packets on msock. | |
1712 | * | |
1713 | * This is here so even when a P_DATA packet traveling via sock overtook an Ack | |
1714 | * packet traveling on msock, they are still processed in the order they have | |
1715 | * been sent. | |
1716 | * | |
1717 | * Note: we don't care for Ack packets overtaking P_DATA packets. | |
1718 | * | |
1719 | * In case packet_seq is larger than mdev->peer_seq number, there are | |
1720 | * outstanding packets on the msock. We wait for them to arrive. | |
1721 | * In case we are the logically next packet, we update mdev->peer_seq | |
1722 | * ourselves. Correctly handles 32bit wrap around. | |
1723 | * | |
1724 | * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, | |
1725 | * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds | |
1726 | * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have | |
1727 | * 1<<9 == 512 seconds aka ages for the 32bit wrap around... | |
1728 | * | |
1729 | * returns 0 if we may process the packet, | |
1730 | * -ERESTARTSYS if we were interrupted (by disconnect signal). */ | |
1731 | static int drbd_wait_peer_seq(struct drbd_conf *mdev, const u32 packet_seq) | |
1732 | { | |
1733 | DEFINE_WAIT(wait); | |
1734 | unsigned int p_seq; | |
1735 | long timeout; | |
1736 | int ret = 0; | |
1737 | spin_lock(&mdev->peer_seq_lock); | |
1738 | for (;;) { | |
1739 | prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE); | |
1740 | if (seq_le(packet_seq, mdev->peer_seq+1)) | |
1741 | break; | |
1742 | if (signal_pending(current)) { | |
1743 | ret = -ERESTARTSYS; | |
1744 | break; | |
1745 | } | |
1746 | p_seq = mdev->peer_seq; | |
1747 | spin_unlock(&mdev->peer_seq_lock); | |
1748 | timeout = schedule_timeout(30*HZ); | |
1749 | spin_lock(&mdev->peer_seq_lock); | |
1750 | if (timeout == 0 && p_seq == mdev->peer_seq) { | |
1751 | ret = -ETIMEDOUT; | |
1752 | dev_err(DEV, "ASSERT FAILED waited 30 seconds for sequence update, forcing reconnect\n"); | |
1753 | break; | |
1754 | } | |
1755 | } | |
1756 | finish_wait(&mdev->seq_wait, &wait); | |
1757 | if (mdev->peer_seq+1 == packet_seq) | |
1758 | mdev->peer_seq++; | |
1759 | spin_unlock(&mdev->peer_seq_lock); | |
1760 | return ret; | |
1761 | } | |
1762 | ||
1763 | /* mirrored write */ | |
1764 | static int receive_Data(struct drbd_conf *mdev, struct p_header *h) | |
1765 | { | |
1766 | sector_t sector; | |
1767 | struct drbd_epoch_entry *e; | |
1768 | struct p_data *p = (struct p_data *)h; | |
1769 | int header_size, data_size; | |
1770 | int rw = WRITE; | |
1771 | u32 dp_flags; | |
1772 | ||
1773 | header_size = sizeof(*p) - sizeof(*h); | |
1774 | data_size = h->length - header_size; | |
1775 | ||
1776 | ERR_IF(data_size == 0) return FALSE; | |
1777 | ||
1778 | if (drbd_recv(mdev, h->payload, header_size) != header_size) | |
1779 | return FALSE; | |
1780 | ||
1781 | if (!get_ldev(mdev)) { | |
1782 | if (__ratelimit(&drbd_ratelimit_state)) | |
1783 | dev_err(DEV, "Can not write mirrored data block " | |
1784 | "to local disk.\n"); | |
1785 | spin_lock(&mdev->peer_seq_lock); | |
1786 | if (mdev->peer_seq+1 == be32_to_cpu(p->seq_num)) | |
1787 | mdev->peer_seq++; | |
1788 | spin_unlock(&mdev->peer_seq_lock); | |
1789 | ||
1790 | drbd_send_ack_dp(mdev, P_NEG_ACK, p); | |
1791 | atomic_inc(&mdev->current_epoch->epoch_size); | |
1792 | return drbd_drain_block(mdev, data_size); | |
1793 | } | |
1794 | ||
1795 | /* get_ldev(mdev) successful. | |
1796 | * Corresponding put_ldev done either below (on various errors), | |
1797 | * or in drbd_endio_write_sec, if we successfully submit the data at | |
1798 | * the end of this function. */ | |
1799 | ||
1800 | sector = be64_to_cpu(p->sector); | |
1801 | e = read_in_block(mdev, p->block_id, sector, data_size); | |
1802 | if (!e) { | |
1803 | put_ldev(mdev); | |
1804 | return FALSE; | |
1805 | } | |
1806 | ||
b411b363 PR |
1807 | e->w.cb = e_end_block; |
1808 | ||
1809 | spin_lock(&mdev->epoch_lock); | |
1810 | e->epoch = mdev->current_epoch; | |
1811 | atomic_inc(&e->epoch->epoch_size); | |
1812 | atomic_inc(&e->epoch->active); | |
1813 | ||
1814 | if (mdev->write_ordering == WO_bio_barrier && atomic_read(&e->epoch->epoch_size) == 1) { | |
1815 | struct drbd_epoch *epoch; | |
1816 | /* Issue a barrier if we start a new epoch, and the previous epoch | |
1817 | was not a epoch containing a single request which already was | |
1818 | a Barrier. */ | |
1819 | epoch = list_entry(e->epoch->list.prev, struct drbd_epoch, list); | |
1820 | if (epoch == e->epoch) { | |
1821 | set_bit(DE_CONTAINS_A_BARRIER, &e->epoch->flags); | |
b411b363 PR |
1822 | rw |= (1<<BIO_RW_BARRIER); |
1823 | e->flags |= EE_IS_BARRIER; | |
1824 | } else { | |
1825 | if (atomic_read(&epoch->epoch_size) > 1 || | |
1826 | !test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags)) { | |
1827 | set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags); | |
b411b363 | 1828 | set_bit(DE_CONTAINS_A_BARRIER, &e->epoch->flags); |
b411b363 PR |
1829 | rw |= (1<<BIO_RW_BARRIER); |
1830 | e->flags |= EE_IS_BARRIER; | |
1831 | } | |
1832 | } | |
1833 | } | |
1834 | spin_unlock(&mdev->epoch_lock); | |
1835 | ||
1836 | dp_flags = be32_to_cpu(p->dp_flags); | |
1837 | if (dp_flags & DP_HARDBARRIER) { | |
1838 | dev_err(DEV, "ASSERT FAILED would have submitted barrier request\n"); | |
1839 | /* rw |= (1<<BIO_RW_BARRIER); */ | |
1840 | } | |
1841 | if (dp_flags & DP_RW_SYNC) | |
1842 | rw |= (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG); | |
1843 | if (dp_flags & DP_MAY_SET_IN_SYNC) | |
1844 | e->flags |= EE_MAY_SET_IN_SYNC; | |
1845 | ||
1846 | /* I'm the receiver, I do hold a net_cnt reference. */ | |
1847 | if (!mdev->net_conf->two_primaries) { | |
1848 | spin_lock_irq(&mdev->req_lock); | |
1849 | } else { | |
1850 | /* don't get the req_lock yet, | |
1851 | * we may sleep in drbd_wait_peer_seq */ | |
1852 | const int size = e->size; | |
1853 | const int discard = test_bit(DISCARD_CONCURRENT, &mdev->flags); | |
1854 | DEFINE_WAIT(wait); | |
1855 | struct drbd_request *i; | |
1856 | struct hlist_node *n; | |
1857 | struct hlist_head *slot; | |
1858 | int first; | |
1859 | ||
1860 | D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); | |
1861 | BUG_ON(mdev->ee_hash == NULL); | |
1862 | BUG_ON(mdev->tl_hash == NULL); | |
1863 | ||
1864 | /* conflict detection and handling: | |
1865 | * 1. wait on the sequence number, | |
1866 | * in case this data packet overtook ACK packets. | |
1867 | * 2. check our hash tables for conflicting requests. | |
1868 | * we only need to walk the tl_hash, since an ee can not | |
1869 | * have a conflict with an other ee: on the submitting | |
1870 | * node, the corresponding req had already been conflicting, | |
1871 | * and a conflicting req is never sent. | |
1872 | * | |
1873 | * Note: for two_primaries, we are protocol C, | |
1874 | * so there cannot be any request that is DONE | |
1875 | * but still on the transfer log. | |
1876 | * | |
1877 | * unconditionally add to the ee_hash. | |
1878 | * | |
1879 | * if no conflicting request is found: | |
1880 | * submit. | |
1881 | * | |
1882 | * if any conflicting request is found | |
1883 | * that has not yet been acked, | |
1884 | * AND I have the "discard concurrent writes" flag: | |
1885 | * queue (via done_ee) the P_DISCARD_ACK; OUT. | |
1886 | * | |
1887 | * if any conflicting request is found: | |
1888 | * block the receiver, waiting on misc_wait | |
1889 | * until no more conflicting requests are there, | |
1890 | * or we get interrupted (disconnect). | |
1891 | * | |
1892 | * we do not just write after local io completion of those | |
1893 | * requests, but only after req is done completely, i.e. | |
1894 | * we wait for the P_DISCARD_ACK to arrive! | |
1895 | * | |
1896 | * then proceed normally, i.e. submit. | |
1897 | */ | |
1898 | if (drbd_wait_peer_seq(mdev, be32_to_cpu(p->seq_num))) | |
1899 | goto out_interrupted; | |
1900 | ||
1901 | spin_lock_irq(&mdev->req_lock); | |
1902 | ||
1903 | hlist_add_head(&e->colision, ee_hash_slot(mdev, sector)); | |
1904 | ||
1905 | #define OVERLAPS overlaps(i->sector, i->size, sector, size) | |
1906 | slot = tl_hash_slot(mdev, sector); | |
1907 | first = 1; | |
1908 | for (;;) { | |
1909 | int have_unacked = 0; | |
1910 | int have_conflict = 0; | |
1911 | prepare_to_wait(&mdev->misc_wait, &wait, | |
1912 | TASK_INTERRUPTIBLE); | |
1913 | hlist_for_each_entry(i, n, slot, colision) { | |
1914 | if (OVERLAPS) { | |
1915 | /* only ALERT on first iteration, | |
1916 | * we may be woken up early... */ | |
1917 | if (first) | |
1918 | dev_alert(DEV, "%s[%u] Concurrent local write detected!" | |
1919 | " new: %llus +%u; pending: %llus +%u\n", | |
1920 | current->comm, current->pid, | |
1921 | (unsigned long long)sector, size, | |
1922 | (unsigned long long)i->sector, i->size); | |
1923 | if (i->rq_state & RQ_NET_PENDING) | |
1924 | ++have_unacked; | |
1925 | ++have_conflict; | |
1926 | } | |
1927 | } | |
1928 | #undef OVERLAPS | |
1929 | if (!have_conflict) | |
1930 | break; | |
1931 | ||
1932 | /* Discard Ack only for the _first_ iteration */ | |
1933 | if (first && discard && have_unacked) { | |
1934 | dev_alert(DEV, "Concurrent write! [DISCARD BY FLAG] sec=%llus\n", | |
1935 | (unsigned long long)sector); | |
1936 | inc_unacked(mdev); | |
1937 | e->w.cb = e_send_discard_ack; | |
1938 | list_add_tail(&e->w.list, &mdev->done_ee); | |
1939 | ||
1940 | spin_unlock_irq(&mdev->req_lock); | |
1941 | ||
1942 | /* we could probably send that P_DISCARD_ACK ourselves, | |
1943 | * but I don't like the receiver using the msock */ | |
1944 | ||
1945 | put_ldev(mdev); | |
1946 | wake_asender(mdev); | |
1947 | finish_wait(&mdev->misc_wait, &wait); | |
1948 | return TRUE; | |
1949 | } | |
1950 | ||
1951 | if (signal_pending(current)) { | |
1952 | hlist_del_init(&e->colision); | |
1953 | ||
1954 | spin_unlock_irq(&mdev->req_lock); | |
1955 | ||
1956 | finish_wait(&mdev->misc_wait, &wait); | |
1957 | goto out_interrupted; | |
1958 | } | |
1959 | ||
1960 | spin_unlock_irq(&mdev->req_lock); | |
1961 | if (first) { | |
1962 | first = 0; | |
1963 | dev_alert(DEV, "Concurrent write! [W AFTERWARDS] " | |
1964 | "sec=%llus\n", (unsigned long long)sector); | |
1965 | } else if (discard) { | |
1966 | /* we had none on the first iteration. | |
1967 | * there must be none now. */ | |
1968 | D_ASSERT(have_unacked == 0); | |
1969 | } | |
1970 | schedule(); | |
1971 | spin_lock_irq(&mdev->req_lock); | |
1972 | } | |
1973 | finish_wait(&mdev->misc_wait, &wait); | |
1974 | } | |
1975 | ||
1976 | list_add(&e->w.list, &mdev->active_ee); | |
1977 | spin_unlock_irq(&mdev->req_lock); | |
1978 | ||
1979 | switch (mdev->net_conf->wire_protocol) { | |
1980 | case DRBD_PROT_C: | |
1981 | inc_unacked(mdev); | |
1982 | /* corresponding dec_unacked() in e_end_block() | |
1983 | * respective _drbd_clear_done_ee */ | |
1984 | break; | |
1985 | case DRBD_PROT_B: | |
1986 | /* I really don't like it that the receiver thread | |
1987 | * sends on the msock, but anyways */ | |
1988 | drbd_send_ack(mdev, P_RECV_ACK, e); | |
1989 | break; | |
1990 | case DRBD_PROT_A: | |
1991 | /* nothing to do */ | |
1992 | break; | |
1993 | } | |
1994 | ||
1995 | if (mdev->state.pdsk == D_DISKLESS) { | |
1996 | /* In case we have the only disk of the cluster, */ | |
1997 | drbd_set_out_of_sync(mdev, e->sector, e->size); | |
1998 | e->flags |= EE_CALL_AL_COMPLETE_IO; | |
1999 | drbd_al_begin_io(mdev, e->sector); | |
2000 | } | |
2001 | ||
45bb912b LE |
2002 | if (drbd_submit_ee(mdev, e, rw, DRBD_FAULT_DT_WR) == 0) |
2003 | return TRUE; | |
b411b363 PR |
2004 | |
2005 | out_interrupted: | |
2006 | /* yes, the epoch_size now is imbalanced. | |
2007 | * but we drop the connection anyways, so we don't have a chance to | |
2008 | * receive a barrier... atomic_inc(&mdev->epoch_size); */ | |
2009 | put_ldev(mdev); | |
2010 | drbd_free_ee(mdev, e); | |
2011 | return FALSE; | |
2012 | } | |
2013 | ||
2014 | static int receive_DataRequest(struct drbd_conf *mdev, struct p_header *h) | |
2015 | { | |
2016 | sector_t sector; | |
2017 | const sector_t capacity = drbd_get_capacity(mdev->this_bdev); | |
2018 | struct drbd_epoch_entry *e; | |
2019 | struct digest_info *di = NULL; | |
2020 | int size, digest_size; | |
2021 | unsigned int fault_type; | |
2022 | struct p_block_req *p = | |
2023 | (struct p_block_req *)h; | |
2024 | const int brps = sizeof(*p)-sizeof(*h); | |
2025 | ||
2026 | if (drbd_recv(mdev, h->payload, brps) != brps) | |
2027 | return FALSE; | |
2028 | ||
2029 | sector = be64_to_cpu(p->sector); | |
2030 | size = be32_to_cpu(p->blksize); | |
2031 | ||
2032 | if (size <= 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_SEGMENT_SIZE) { | |
2033 | dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, | |
2034 | (unsigned long long)sector, size); | |
2035 | return FALSE; | |
2036 | } | |
2037 | if (sector + (size>>9) > capacity) { | |
2038 | dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, | |
2039 | (unsigned long long)sector, size); | |
2040 | return FALSE; | |
2041 | } | |
2042 | ||
2043 | if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) { | |
2044 | if (__ratelimit(&drbd_ratelimit_state)) | |
2045 | dev_err(DEV, "Can not satisfy peer's read request, " | |
2046 | "no local data.\n"); | |
2047 | drbd_send_ack_rp(mdev, h->command == P_DATA_REQUEST ? P_NEG_DREPLY : | |
2048 | P_NEG_RS_DREPLY , p); | |
c3470cde | 2049 | return drbd_drain_block(mdev, h->length - brps); |
b411b363 PR |
2050 | } |
2051 | ||
2052 | /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD | |
2053 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
2054 | * which in turn might block on the other node at this very place. */ | |
2055 | e = drbd_alloc_ee(mdev, p->block_id, sector, size, GFP_NOIO); | |
2056 | if (!e) { | |
2057 | put_ldev(mdev); | |
2058 | return FALSE; | |
2059 | } | |
2060 | ||
b411b363 PR |
2061 | switch (h->command) { |
2062 | case P_DATA_REQUEST: | |
2063 | e->w.cb = w_e_end_data_req; | |
2064 | fault_type = DRBD_FAULT_DT_RD; | |
2065 | break; | |
2066 | case P_RS_DATA_REQUEST: | |
2067 | e->w.cb = w_e_end_rsdata_req; | |
2068 | fault_type = DRBD_FAULT_RS_RD; | |
2069 | /* Eventually this should become asynchronously. Currently it | |
2070 | * blocks the whole receiver just to delay the reading of a | |
2071 | * resync data block. | |
2072 | * the drbd_work_queue mechanism is made for this... | |
2073 | */ | |
2074 | if (!drbd_rs_begin_io(mdev, sector)) { | |
2075 | /* we have been interrupted, | |
2076 | * probably connection lost! */ | |
2077 | D_ASSERT(signal_pending(current)); | |
2078 | goto out_free_e; | |
2079 | } | |
2080 | break; | |
2081 | ||
2082 | case P_OV_REPLY: | |
2083 | case P_CSUM_RS_REQUEST: | |
2084 | fault_type = DRBD_FAULT_RS_RD; | |
2085 | digest_size = h->length - brps ; | |
2086 | di = kmalloc(sizeof(*di) + digest_size, GFP_NOIO); | |
2087 | if (!di) | |
2088 | goto out_free_e; | |
2089 | ||
2090 | di->digest_size = digest_size; | |
2091 | di->digest = (((char *)di)+sizeof(struct digest_info)); | |
2092 | ||
2093 | if (drbd_recv(mdev, di->digest, digest_size) != digest_size) | |
2094 | goto out_free_e; | |
2095 | ||
2096 | e->block_id = (u64)(unsigned long)di; | |
2097 | if (h->command == P_CSUM_RS_REQUEST) { | |
2098 | D_ASSERT(mdev->agreed_pro_version >= 89); | |
2099 | e->w.cb = w_e_end_csum_rs_req; | |
2100 | } else if (h->command == P_OV_REPLY) { | |
2101 | e->w.cb = w_e_end_ov_reply; | |
2102 | dec_rs_pending(mdev); | |
2103 | break; | |
2104 | } | |
2105 | ||
2106 | if (!drbd_rs_begin_io(mdev, sector)) { | |
2107 | /* we have been interrupted, probably connection lost! */ | |
2108 | D_ASSERT(signal_pending(current)); | |
2109 | goto out_free_e; | |
2110 | } | |
2111 | break; | |
2112 | ||
2113 | case P_OV_REQUEST: | |
2114 | if (mdev->state.conn >= C_CONNECTED && | |
2115 | mdev->state.conn != C_VERIFY_T) | |
2116 | dev_warn(DEV, "ASSERT FAILED: got P_OV_REQUEST while being %s\n", | |
2117 | drbd_conn_str(mdev->state.conn)); | |
2118 | if (mdev->ov_start_sector == ~(sector_t)0 && | |
2119 | mdev->agreed_pro_version >= 90) { | |
2120 | mdev->ov_start_sector = sector; | |
2121 | mdev->ov_position = sector; | |
2122 | mdev->ov_left = mdev->rs_total - BM_SECT_TO_BIT(sector); | |
2123 | dev_info(DEV, "Online Verify start sector: %llu\n", | |
2124 | (unsigned long long)sector); | |
2125 | } | |
2126 | e->w.cb = w_e_end_ov_req; | |
2127 | fault_type = DRBD_FAULT_RS_RD; | |
2128 | /* Eventually this should become asynchronous. Currently it | |
2129 | * blocks the whole receiver just to delay the reading of a | |
2130 | * resync data block. | |
2131 | * the drbd_work_queue mechanism is made for this... | |
2132 | */ | |
2133 | if (!drbd_rs_begin_io(mdev, sector)) { | |
2134 | /* we have been interrupted, | |
2135 | * probably connection lost! */ | |
2136 | D_ASSERT(signal_pending(current)); | |
2137 | goto out_free_e; | |
2138 | } | |
2139 | break; | |
2140 | ||
2141 | ||
2142 | default: | |
2143 | dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n", | |
2144 | cmdname(h->command)); | |
2145 | fault_type = DRBD_FAULT_MAX; | |
2146 | } | |
2147 | ||
2148 | spin_lock_irq(&mdev->req_lock); | |
2149 | list_add(&e->w.list, &mdev->read_ee); | |
2150 | spin_unlock_irq(&mdev->req_lock); | |
2151 | ||
2152 | inc_unacked(mdev); | |
2153 | ||
45bb912b LE |
2154 | if (drbd_submit_ee(mdev, e, READ, fault_type) == 0) |
2155 | return TRUE; | |
b411b363 PR |
2156 | |
2157 | out_free_e: | |
2158 | kfree(di); | |
2159 | put_ldev(mdev); | |
2160 | drbd_free_ee(mdev, e); | |
2161 | return FALSE; | |
2162 | } | |
2163 | ||
2164 | static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local) | |
2165 | { | |
2166 | int self, peer, rv = -100; | |
2167 | unsigned long ch_self, ch_peer; | |
2168 | ||
2169 | self = mdev->ldev->md.uuid[UI_BITMAP] & 1; | |
2170 | peer = mdev->p_uuid[UI_BITMAP] & 1; | |
2171 | ||
2172 | ch_peer = mdev->p_uuid[UI_SIZE]; | |
2173 | ch_self = mdev->comm_bm_set; | |
2174 | ||
2175 | switch (mdev->net_conf->after_sb_0p) { | |
2176 | case ASB_CONSENSUS: | |
2177 | case ASB_DISCARD_SECONDARY: | |
2178 | case ASB_CALL_HELPER: | |
2179 | dev_err(DEV, "Configuration error.\n"); | |
2180 | break; | |
2181 | case ASB_DISCONNECT: | |
2182 | break; | |
2183 | case ASB_DISCARD_YOUNGER_PRI: | |
2184 | if (self == 0 && peer == 1) { | |
2185 | rv = -1; | |
2186 | break; | |
2187 | } | |
2188 | if (self == 1 && peer == 0) { | |
2189 | rv = 1; | |
2190 | break; | |
2191 | } | |
2192 | /* Else fall through to one of the other strategies... */ | |
2193 | case ASB_DISCARD_OLDER_PRI: | |
2194 | if (self == 0 && peer == 1) { | |
2195 | rv = 1; | |
2196 | break; | |
2197 | } | |
2198 | if (self == 1 && peer == 0) { | |
2199 | rv = -1; | |
2200 | break; | |
2201 | } | |
2202 | /* Else fall through to one of the other strategies... */ | |
ad19bf6e | 2203 | dev_warn(DEV, "Discard younger/older primary did not find a decision\n" |
b411b363 PR |
2204 | "Using discard-least-changes instead\n"); |
2205 | case ASB_DISCARD_ZERO_CHG: | |
2206 | if (ch_peer == 0 && ch_self == 0) { | |
2207 | rv = test_bit(DISCARD_CONCURRENT, &mdev->flags) | |
2208 | ? -1 : 1; | |
2209 | break; | |
2210 | } else { | |
2211 | if (ch_peer == 0) { rv = 1; break; } | |
2212 | if (ch_self == 0) { rv = -1; break; } | |
2213 | } | |
2214 | if (mdev->net_conf->after_sb_0p == ASB_DISCARD_ZERO_CHG) | |
2215 | break; | |
2216 | case ASB_DISCARD_LEAST_CHG: | |
2217 | if (ch_self < ch_peer) | |
2218 | rv = -1; | |
2219 | else if (ch_self > ch_peer) | |
2220 | rv = 1; | |
2221 | else /* ( ch_self == ch_peer ) */ | |
2222 | /* Well, then use something else. */ | |
2223 | rv = test_bit(DISCARD_CONCURRENT, &mdev->flags) | |
2224 | ? -1 : 1; | |
2225 | break; | |
2226 | case ASB_DISCARD_LOCAL: | |
2227 | rv = -1; | |
2228 | break; | |
2229 | case ASB_DISCARD_REMOTE: | |
2230 | rv = 1; | |
2231 | } | |
2232 | ||
2233 | return rv; | |
2234 | } | |
2235 | ||
2236 | static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local) | |
2237 | { | |
2238 | int self, peer, hg, rv = -100; | |
2239 | ||
2240 | self = mdev->ldev->md.uuid[UI_BITMAP] & 1; | |
2241 | peer = mdev->p_uuid[UI_BITMAP] & 1; | |
2242 | ||
2243 | switch (mdev->net_conf->after_sb_1p) { | |
2244 | case ASB_DISCARD_YOUNGER_PRI: | |
2245 | case ASB_DISCARD_OLDER_PRI: | |
2246 | case ASB_DISCARD_LEAST_CHG: | |
2247 | case ASB_DISCARD_LOCAL: | |
2248 | case ASB_DISCARD_REMOTE: | |
2249 | dev_err(DEV, "Configuration error.\n"); | |
2250 | break; | |
2251 | case ASB_DISCONNECT: | |
2252 | break; | |
2253 | case ASB_CONSENSUS: | |
2254 | hg = drbd_asb_recover_0p(mdev); | |
2255 | if (hg == -1 && mdev->state.role == R_SECONDARY) | |
2256 | rv = hg; | |
2257 | if (hg == 1 && mdev->state.role == R_PRIMARY) | |
2258 | rv = hg; | |
2259 | break; | |
2260 | case ASB_VIOLENTLY: | |
2261 | rv = drbd_asb_recover_0p(mdev); | |
2262 | break; | |
2263 | case ASB_DISCARD_SECONDARY: | |
2264 | return mdev->state.role == R_PRIMARY ? 1 : -1; | |
2265 | case ASB_CALL_HELPER: | |
2266 | hg = drbd_asb_recover_0p(mdev); | |
2267 | if (hg == -1 && mdev->state.role == R_PRIMARY) { | |
2268 | self = drbd_set_role(mdev, R_SECONDARY, 0); | |
2269 | /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, | |
2270 | * we might be here in C_WF_REPORT_PARAMS which is transient. | |
2271 | * we do not need to wait for the after state change work either. */ | |
2272 | self = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); | |
2273 | if (self != SS_SUCCESS) { | |
2274 | drbd_khelper(mdev, "pri-lost-after-sb"); | |
2275 | } else { | |
2276 | dev_warn(DEV, "Successfully gave up primary role.\n"); | |
2277 | rv = hg; | |
2278 | } | |
2279 | } else | |
2280 | rv = hg; | |
2281 | } | |
2282 | ||
2283 | return rv; | |
2284 | } | |
2285 | ||
2286 | static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local) | |
2287 | { | |
2288 | int self, peer, hg, rv = -100; | |
2289 | ||
2290 | self = mdev->ldev->md.uuid[UI_BITMAP] & 1; | |
2291 | peer = mdev->p_uuid[UI_BITMAP] & 1; | |
2292 | ||
2293 | switch (mdev->net_conf->after_sb_2p) { | |
2294 | case ASB_DISCARD_YOUNGER_PRI: | |
2295 | case ASB_DISCARD_OLDER_PRI: | |
2296 | case ASB_DISCARD_LEAST_CHG: | |
2297 | case ASB_DISCARD_LOCAL: | |
2298 | case ASB_DISCARD_REMOTE: | |
2299 | case ASB_CONSENSUS: | |
2300 | case ASB_DISCARD_SECONDARY: | |
2301 | dev_err(DEV, "Configuration error.\n"); | |
2302 | break; | |
2303 | case ASB_VIOLENTLY: | |
2304 | rv = drbd_asb_recover_0p(mdev); | |
2305 | break; | |
2306 | case ASB_DISCONNECT: | |
2307 | break; | |
2308 | case ASB_CALL_HELPER: | |
2309 | hg = drbd_asb_recover_0p(mdev); | |
2310 | if (hg == -1) { | |
2311 | /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, | |
2312 | * we might be here in C_WF_REPORT_PARAMS which is transient. | |
2313 | * we do not need to wait for the after state change work either. */ | |
2314 | self = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); | |
2315 | if (self != SS_SUCCESS) { | |
2316 | drbd_khelper(mdev, "pri-lost-after-sb"); | |
2317 | } else { | |
2318 | dev_warn(DEV, "Successfully gave up primary role.\n"); | |
2319 | rv = hg; | |
2320 | } | |
2321 | } else | |
2322 | rv = hg; | |
2323 | } | |
2324 | ||
2325 | return rv; | |
2326 | } | |
2327 | ||
2328 | static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid, | |
2329 | u64 bits, u64 flags) | |
2330 | { | |
2331 | if (!uuid) { | |
2332 | dev_info(DEV, "%s uuid info vanished while I was looking!\n", text); | |
2333 | return; | |
2334 | } | |
2335 | dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", | |
2336 | text, | |
2337 | (unsigned long long)uuid[UI_CURRENT], | |
2338 | (unsigned long long)uuid[UI_BITMAP], | |
2339 | (unsigned long long)uuid[UI_HISTORY_START], | |
2340 | (unsigned long long)uuid[UI_HISTORY_END], | |
2341 | (unsigned long long)bits, | |
2342 | (unsigned long long)flags); | |
2343 | } | |
2344 | ||
2345 | /* | |
2346 | 100 after split brain try auto recover | |
2347 | 2 C_SYNC_SOURCE set BitMap | |
2348 | 1 C_SYNC_SOURCE use BitMap | |
2349 | 0 no Sync | |
2350 | -1 C_SYNC_TARGET use BitMap | |
2351 | -2 C_SYNC_TARGET set BitMap | |
2352 | -100 after split brain, disconnect | |
2353 | -1000 unrelated data | |
2354 | */ | |
2355 | static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local) | |
2356 | { | |
2357 | u64 self, peer; | |
2358 | int i, j; | |
2359 | ||
2360 | self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); | |
2361 | peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); | |
2362 | ||
2363 | *rule_nr = 10; | |
2364 | if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) | |
2365 | return 0; | |
2366 | ||
2367 | *rule_nr = 20; | |
2368 | if ((self == UUID_JUST_CREATED || self == (u64)0) && | |
2369 | peer != UUID_JUST_CREATED) | |
2370 | return -2; | |
2371 | ||
2372 | *rule_nr = 30; | |
2373 | if (self != UUID_JUST_CREATED && | |
2374 | (peer == UUID_JUST_CREATED || peer == (u64)0)) | |
2375 | return 2; | |
2376 | ||
2377 | if (self == peer) { | |
2378 | int rct, dc; /* roles at crash time */ | |
2379 | ||
2380 | if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) { | |
2381 | ||
2382 | if (mdev->agreed_pro_version < 91) | |
2383 | return -1001; | |
2384 | ||
2385 | if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) && | |
2386 | (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { | |
2387 | dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n"); | |
2388 | drbd_uuid_set_bm(mdev, 0UL); | |
2389 | ||
2390 | drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, | |
2391 | mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); | |
2392 | *rule_nr = 34; | |
2393 | } else { | |
2394 | dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n"); | |
2395 | *rule_nr = 36; | |
2396 | } | |
2397 | ||
2398 | return 1; | |
2399 | } | |
2400 | ||
2401 | if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) { | |
2402 | ||
2403 | if (mdev->agreed_pro_version < 91) | |
2404 | return -1001; | |
2405 | ||
2406 | if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) && | |
2407 | (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) { | |
2408 | dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); | |
2409 | ||
2410 | mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START]; | |
2411 | mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP]; | |
2412 | mdev->p_uuid[UI_BITMAP] = 0UL; | |
2413 | ||
2414 | drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); | |
2415 | *rule_nr = 35; | |
2416 | } else { | |
2417 | dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n"); | |
2418 | *rule_nr = 37; | |
2419 | } | |
2420 | ||
2421 | return -1; | |
2422 | } | |
2423 | ||
2424 | /* Common power [off|failure] */ | |
2425 | rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) + | |
2426 | (mdev->p_uuid[UI_FLAGS] & 2); | |
2427 | /* lowest bit is set when we were primary, | |
2428 | * next bit (weight 2) is set when peer was primary */ | |
2429 | *rule_nr = 40; | |
2430 | ||
2431 | switch (rct) { | |
2432 | case 0: /* !self_pri && !peer_pri */ return 0; | |
2433 | case 1: /* self_pri && !peer_pri */ return 1; | |
2434 | case 2: /* !self_pri && peer_pri */ return -1; | |
2435 | case 3: /* self_pri && peer_pri */ | |
2436 | dc = test_bit(DISCARD_CONCURRENT, &mdev->flags); | |
2437 | return dc ? -1 : 1; | |
2438 | } | |
2439 | } | |
2440 | ||
2441 | *rule_nr = 50; | |
2442 | peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); | |
2443 | if (self == peer) | |
2444 | return -1; | |
2445 | ||
2446 | *rule_nr = 51; | |
2447 | peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); | |
2448 | if (self == peer) { | |
2449 | self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); | |
2450 | peer = mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1); | |
2451 | if (self == peer) { | |
2452 | /* The last P_SYNC_UUID did not get though. Undo the last start of | |
2453 | resync as sync source modifications of the peer's UUIDs. */ | |
2454 | ||
2455 | if (mdev->agreed_pro_version < 91) | |
2456 | return -1001; | |
2457 | ||
2458 | mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START]; | |
2459 | mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1]; | |
2460 | return -1; | |
2461 | } | |
2462 | } | |
2463 | ||
2464 | *rule_nr = 60; | |
2465 | self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); | |
2466 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { | |
2467 | peer = mdev->p_uuid[i] & ~((u64)1); | |
2468 | if (self == peer) | |
2469 | return -2; | |
2470 | } | |
2471 | ||
2472 | *rule_nr = 70; | |
2473 | self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); | |
2474 | peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); | |
2475 | if (self == peer) | |
2476 | return 1; | |
2477 | ||
2478 | *rule_nr = 71; | |
2479 | self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); | |
2480 | if (self == peer) { | |
2481 | self = mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1); | |
2482 | peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); | |
2483 | if (self == peer) { | |
2484 | /* The last P_SYNC_UUID did not get though. Undo the last start of | |
2485 | resync as sync source modifications of our UUIDs. */ | |
2486 | ||
2487 | if (mdev->agreed_pro_version < 91) | |
2488 | return -1001; | |
2489 | ||
2490 | _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]); | |
2491 | _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]); | |
2492 | ||
2493 | dev_info(DEV, "Undid last start of resync:\n"); | |
2494 | ||
2495 | drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, | |
2496 | mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); | |
2497 | ||
2498 | return 1; | |
2499 | } | |
2500 | } | |
2501 | ||
2502 | ||
2503 | *rule_nr = 80; | |
d8c2a36b | 2504 | peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); |
b411b363 PR |
2505 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { |
2506 | self = mdev->ldev->md.uuid[i] & ~((u64)1); | |
2507 | if (self == peer) | |
2508 | return 2; | |
2509 | } | |
2510 | ||
2511 | *rule_nr = 90; | |
2512 | self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); | |
2513 | peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); | |
2514 | if (self == peer && self != ((u64)0)) | |
2515 | return 100; | |
2516 | ||
2517 | *rule_nr = 100; | |
2518 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { | |
2519 | self = mdev->ldev->md.uuid[i] & ~((u64)1); | |
2520 | for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { | |
2521 | peer = mdev->p_uuid[j] & ~((u64)1); | |
2522 | if (self == peer) | |
2523 | return -100; | |
2524 | } | |
2525 | } | |
2526 | ||
2527 | return -1000; | |
2528 | } | |
2529 | ||
2530 | /* drbd_sync_handshake() returns the new conn state on success, or | |
2531 | CONN_MASK (-1) on failure. | |
2532 | */ | |
2533 | static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role, | |
2534 | enum drbd_disk_state peer_disk) __must_hold(local) | |
2535 | { | |
2536 | int hg, rule_nr; | |
2537 | enum drbd_conns rv = C_MASK; | |
2538 | enum drbd_disk_state mydisk; | |
2539 | ||
2540 | mydisk = mdev->state.disk; | |
2541 | if (mydisk == D_NEGOTIATING) | |
2542 | mydisk = mdev->new_state_tmp.disk; | |
2543 | ||
2544 | dev_info(DEV, "drbd_sync_handshake:\n"); | |
2545 | drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0); | |
2546 | drbd_uuid_dump(mdev, "peer", mdev->p_uuid, | |
2547 | mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); | |
2548 | ||
2549 | hg = drbd_uuid_compare(mdev, &rule_nr); | |
2550 | ||
2551 | dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr); | |
2552 | ||
2553 | if (hg == -1000) { | |
2554 | dev_alert(DEV, "Unrelated data, aborting!\n"); | |
2555 | return C_MASK; | |
2556 | } | |
2557 | if (hg == -1001) { | |
2558 | dev_alert(DEV, "To resolve this both sides have to support at least protocol\n"); | |
2559 | return C_MASK; | |
2560 | } | |
2561 | ||
2562 | if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || | |
2563 | (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { | |
2564 | int f = (hg == -100) || abs(hg) == 2; | |
2565 | hg = mydisk > D_INCONSISTENT ? 1 : -1; | |
2566 | if (f) | |
2567 | hg = hg*2; | |
2568 | dev_info(DEV, "Becoming sync %s due to disk states.\n", | |
2569 | hg > 0 ? "source" : "target"); | |
2570 | } | |
2571 | ||
3a11a487 AG |
2572 | if (abs(hg) == 100) |
2573 | drbd_khelper(mdev, "initial-split-brain"); | |
2574 | ||
b411b363 PR |
2575 | if (hg == 100 || (hg == -100 && mdev->net_conf->always_asbp)) { |
2576 | int pcount = (mdev->state.role == R_PRIMARY) | |
2577 | + (peer_role == R_PRIMARY); | |
2578 | int forced = (hg == -100); | |
2579 | ||
2580 | switch (pcount) { | |
2581 | case 0: | |
2582 | hg = drbd_asb_recover_0p(mdev); | |
2583 | break; | |
2584 | case 1: | |
2585 | hg = drbd_asb_recover_1p(mdev); | |
2586 | break; | |
2587 | case 2: | |
2588 | hg = drbd_asb_recover_2p(mdev); | |
2589 | break; | |
2590 | } | |
2591 | if (abs(hg) < 100) { | |
2592 | dev_warn(DEV, "Split-Brain detected, %d primaries, " | |
2593 | "automatically solved. Sync from %s node\n", | |
2594 | pcount, (hg < 0) ? "peer" : "this"); | |
2595 | if (forced) { | |
2596 | dev_warn(DEV, "Doing a full sync, since" | |
2597 | " UUIDs where ambiguous.\n"); | |
2598 | hg = hg*2; | |
2599 | } | |
2600 | } | |
2601 | } | |
2602 | ||
2603 | if (hg == -100) { | |
2604 | if (mdev->net_conf->want_lose && !(mdev->p_uuid[UI_FLAGS]&1)) | |
2605 | hg = -1; | |
2606 | if (!mdev->net_conf->want_lose && (mdev->p_uuid[UI_FLAGS]&1)) | |
2607 | hg = 1; | |
2608 | ||
2609 | if (abs(hg) < 100) | |
2610 | dev_warn(DEV, "Split-Brain detected, manually solved. " | |
2611 | "Sync from %s node\n", | |
2612 | (hg < 0) ? "peer" : "this"); | |
2613 | } | |
2614 | ||
2615 | if (hg == -100) { | |
580b9767 LE |
2616 | /* FIXME this log message is not correct if we end up here |
2617 | * after an attempted attach on a diskless node. | |
2618 | * We just refuse to attach -- well, we drop the "connection" | |
2619 | * to that disk, in a way... */ | |
3a11a487 | 2620 | dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n"); |
b411b363 PR |
2621 | drbd_khelper(mdev, "split-brain"); |
2622 | return C_MASK; | |
2623 | } | |
2624 | ||
2625 | if (hg > 0 && mydisk <= D_INCONSISTENT) { | |
2626 | dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n"); | |
2627 | return C_MASK; | |
2628 | } | |
2629 | ||
2630 | if (hg < 0 && /* by intention we do not use mydisk here. */ | |
2631 | mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) { | |
2632 | switch (mdev->net_conf->rr_conflict) { | |
2633 | case ASB_CALL_HELPER: | |
2634 | drbd_khelper(mdev, "pri-lost"); | |
2635 | /* fall through */ | |
2636 | case ASB_DISCONNECT: | |
2637 | dev_err(DEV, "I shall become SyncTarget, but I am primary!\n"); | |
2638 | return C_MASK; | |
2639 | case ASB_VIOLENTLY: | |
2640 | dev_warn(DEV, "Becoming SyncTarget, violating the stable-data" | |
2641 | "assumption\n"); | |
2642 | } | |
2643 | } | |
2644 | ||
cf14c2e9 PR |
2645 | if (mdev->net_conf->dry_run || test_bit(CONN_DRY_RUN, &mdev->flags)) { |
2646 | if (hg == 0) | |
2647 | dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n"); | |
2648 | else | |
2649 | dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.", | |
2650 | drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), | |
2651 | abs(hg) >= 2 ? "full" : "bit-map based"); | |
2652 | return C_MASK; | |
2653 | } | |
2654 | ||
b411b363 PR |
2655 | if (abs(hg) >= 2) { |
2656 | dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); | |
2657 | if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake")) | |
2658 | return C_MASK; | |
2659 | } | |
2660 | ||
2661 | if (hg > 0) { /* become sync source. */ | |
2662 | rv = C_WF_BITMAP_S; | |
2663 | } else if (hg < 0) { /* become sync target */ | |
2664 | rv = C_WF_BITMAP_T; | |
2665 | } else { | |
2666 | rv = C_CONNECTED; | |
2667 | if (drbd_bm_total_weight(mdev)) { | |
2668 | dev_info(DEV, "No resync, but %lu bits in bitmap!\n", | |
2669 | drbd_bm_total_weight(mdev)); | |
2670 | } | |
2671 | } | |
2672 | ||
2673 | return rv; | |
2674 | } | |
2675 | ||
2676 | /* returns 1 if invalid */ | |
2677 | static int cmp_after_sb(enum drbd_after_sb_p peer, enum drbd_after_sb_p self) | |
2678 | { | |
2679 | /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ | |
2680 | if ((peer == ASB_DISCARD_REMOTE && self == ASB_DISCARD_LOCAL) || | |
2681 | (self == ASB_DISCARD_REMOTE && peer == ASB_DISCARD_LOCAL)) | |
2682 | return 0; | |
2683 | ||
2684 | /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ | |
2685 | if (peer == ASB_DISCARD_REMOTE || peer == ASB_DISCARD_LOCAL || | |
2686 | self == ASB_DISCARD_REMOTE || self == ASB_DISCARD_LOCAL) | |
2687 | return 1; | |
2688 | ||
2689 | /* everything else is valid if they are equal on both sides. */ | |
2690 | if (peer == self) | |
2691 | return 0; | |
2692 | ||
2693 | /* everything es is invalid. */ | |
2694 | return 1; | |
2695 | } | |
2696 | ||
2697 | static int receive_protocol(struct drbd_conf *mdev, struct p_header *h) | |
2698 | { | |
2699 | struct p_protocol *p = (struct p_protocol *)h; | |
2700 | int header_size, data_size; | |
2701 | int p_proto, p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; | |
cf14c2e9 | 2702 | int p_want_lose, p_two_primaries, cf; |
b411b363 PR |
2703 | char p_integrity_alg[SHARED_SECRET_MAX] = ""; |
2704 | ||
2705 | header_size = sizeof(*p) - sizeof(*h); | |
2706 | data_size = h->length - header_size; | |
2707 | ||
2708 | if (drbd_recv(mdev, h->payload, header_size) != header_size) | |
2709 | return FALSE; | |
2710 | ||
2711 | p_proto = be32_to_cpu(p->protocol); | |
2712 | p_after_sb_0p = be32_to_cpu(p->after_sb_0p); | |
2713 | p_after_sb_1p = be32_to_cpu(p->after_sb_1p); | |
2714 | p_after_sb_2p = be32_to_cpu(p->after_sb_2p); | |
b411b363 | 2715 | p_two_primaries = be32_to_cpu(p->two_primaries); |
cf14c2e9 PR |
2716 | cf = be32_to_cpu(p->conn_flags); |
2717 | p_want_lose = cf & CF_WANT_LOSE; | |
2718 | ||
2719 | clear_bit(CONN_DRY_RUN, &mdev->flags); | |
2720 | ||
2721 | if (cf & CF_DRY_RUN) | |
2722 | set_bit(CONN_DRY_RUN, &mdev->flags); | |
b411b363 PR |
2723 | |
2724 | if (p_proto != mdev->net_conf->wire_protocol) { | |
2725 | dev_err(DEV, "incompatible communication protocols\n"); | |
2726 | goto disconnect; | |
2727 | } | |
2728 | ||
2729 | if (cmp_after_sb(p_after_sb_0p, mdev->net_conf->after_sb_0p)) { | |
2730 | dev_err(DEV, "incompatible after-sb-0pri settings\n"); | |
2731 | goto disconnect; | |
2732 | } | |
2733 | ||
2734 | if (cmp_after_sb(p_after_sb_1p, mdev->net_conf->after_sb_1p)) { | |
2735 | dev_err(DEV, "incompatible after-sb-1pri settings\n"); | |
2736 | goto disconnect; | |
2737 | } | |
2738 | ||
2739 | if (cmp_after_sb(p_after_sb_2p, mdev->net_conf->after_sb_2p)) { | |
2740 | dev_err(DEV, "incompatible after-sb-2pri settings\n"); | |
2741 | goto disconnect; | |
2742 | } | |
2743 | ||
2744 | if (p_want_lose && mdev->net_conf->want_lose) { | |
2745 | dev_err(DEV, "both sides have the 'want_lose' flag set\n"); | |
2746 | goto disconnect; | |
2747 | } | |
2748 | ||
2749 | if (p_two_primaries != mdev->net_conf->two_primaries) { | |
2750 | dev_err(DEV, "incompatible setting of the two-primaries options\n"); | |
2751 | goto disconnect; | |
2752 | } | |
2753 | ||
2754 | if (mdev->agreed_pro_version >= 87) { | |
2755 | unsigned char *my_alg = mdev->net_conf->integrity_alg; | |
2756 | ||
2757 | if (drbd_recv(mdev, p_integrity_alg, data_size) != data_size) | |
2758 | return FALSE; | |
2759 | ||
2760 | p_integrity_alg[SHARED_SECRET_MAX-1] = 0; | |
2761 | if (strcmp(p_integrity_alg, my_alg)) { | |
2762 | dev_err(DEV, "incompatible setting of the data-integrity-alg\n"); | |
2763 | goto disconnect; | |
2764 | } | |
2765 | dev_info(DEV, "data-integrity-alg: %s\n", | |
2766 | my_alg[0] ? my_alg : (unsigned char *)"<not-used>"); | |
2767 | } | |
2768 | ||
2769 | return TRUE; | |
2770 | ||
2771 | disconnect: | |
2772 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
2773 | return FALSE; | |
2774 | } | |
2775 | ||
2776 | /* helper function | |
2777 | * input: alg name, feature name | |
2778 | * return: NULL (alg name was "") | |
2779 | * ERR_PTR(error) if something goes wrong | |
2780 | * or the crypto hash ptr, if it worked out ok. */ | |
2781 | struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev, | |
2782 | const char *alg, const char *name) | |
2783 | { | |
2784 | struct crypto_hash *tfm; | |
2785 | ||
2786 | if (!alg[0]) | |
2787 | return NULL; | |
2788 | ||
2789 | tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC); | |
2790 | if (IS_ERR(tfm)) { | |
2791 | dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n", | |
2792 | alg, name, PTR_ERR(tfm)); | |
2793 | return tfm; | |
2794 | } | |
2795 | if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) { | |
2796 | crypto_free_hash(tfm); | |
2797 | dev_err(DEV, "\"%s\" is not a digest (%s)\n", alg, name); | |
2798 | return ERR_PTR(-EINVAL); | |
2799 | } | |
2800 | return tfm; | |
2801 | } | |
2802 | ||
2803 | static int receive_SyncParam(struct drbd_conf *mdev, struct p_header *h) | |
2804 | { | |
2805 | int ok = TRUE; | |
2806 | struct p_rs_param_89 *p = (struct p_rs_param_89 *)h; | |
2807 | unsigned int header_size, data_size, exp_max_sz; | |
2808 | struct crypto_hash *verify_tfm = NULL; | |
2809 | struct crypto_hash *csums_tfm = NULL; | |
2810 | const int apv = mdev->agreed_pro_version; | |
2811 | ||
2812 | exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) | |
2813 | : apv == 88 ? sizeof(struct p_rs_param) | |
2814 | + SHARED_SECRET_MAX | |
2815 | : /* 89 */ sizeof(struct p_rs_param_89); | |
2816 | ||
2817 | if (h->length > exp_max_sz) { | |
2818 | dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n", | |
2819 | h->length, exp_max_sz); | |
2820 | return FALSE; | |
2821 | } | |
2822 | ||
2823 | if (apv <= 88) { | |
2824 | header_size = sizeof(struct p_rs_param) - sizeof(*h); | |
2825 | data_size = h->length - header_size; | |
2826 | } else /* apv >= 89 */ { | |
2827 | header_size = sizeof(struct p_rs_param_89) - sizeof(*h); | |
2828 | data_size = h->length - header_size; | |
2829 | D_ASSERT(data_size == 0); | |
2830 | } | |
2831 | ||
2832 | /* initialize verify_alg and csums_alg */ | |
2833 | memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); | |
2834 | ||
2835 | if (drbd_recv(mdev, h->payload, header_size) != header_size) | |
2836 | return FALSE; | |
2837 | ||
2838 | mdev->sync_conf.rate = be32_to_cpu(p->rate); | |
2839 | ||
2840 | if (apv >= 88) { | |
2841 | if (apv == 88) { | |
2842 | if (data_size > SHARED_SECRET_MAX) { | |
2843 | dev_err(DEV, "verify-alg too long, " | |
2844 | "peer wants %u, accepting only %u byte\n", | |
2845 | data_size, SHARED_SECRET_MAX); | |
2846 | return FALSE; | |
2847 | } | |
2848 | ||
2849 | if (drbd_recv(mdev, p->verify_alg, data_size) != data_size) | |
2850 | return FALSE; | |
2851 | ||
2852 | /* we expect NUL terminated string */ | |
2853 | /* but just in case someone tries to be evil */ | |
2854 | D_ASSERT(p->verify_alg[data_size-1] == 0); | |
2855 | p->verify_alg[data_size-1] = 0; | |
2856 | ||
2857 | } else /* apv >= 89 */ { | |
2858 | /* we still expect NUL terminated strings */ | |
2859 | /* but just in case someone tries to be evil */ | |
2860 | D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0); | |
2861 | D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0); | |
2862 | p->verify_alg[SHARED_SECRET_MAX-1] = 0; | |
2863 | p->csums_alg[SHARED_SECRET_MAX-1] = 0; | |
2864 | } | |
2865 | ||
2866 | if (strcmp(mdev->sync_conf.verify_alg, p->verify_alg)) { | |
2867 | if (mdev->state.conn == C_WF_REPORT_PARAMS) { | |
2868 | dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", | |
2869 | mdev->sync_conf.verify_alg, p->verify_alg); | |
2870 | goto disconnect; | |
2871 | } | |
2872 | verify_tfm = drbd_crypto_alloc_digest_safe(mdev, | |
2873 | p->verify_alg, "verify-alg"); | |
2874 | if (IS_ERR(verify_tfm)) { | |
2875 | verify_tfm = NULL; | |
2876 | goto disconnect; | |
2877 | } | |
2878 | } | |
2879 | ||
2880 | if (apv >= 89 && strcmp(mdev->sync_conf.csums_alg, p->csums_alg)) { | |
2881 | if (mdev->state.conn == C_WF_REPORT_PARAMS) { | |
2882 | dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", | |
2883 | mdev->sync_conf.csums_alg, p->csums_alg); | |
2884 | goto disconnect; | |
2885 | } | |
2886 | csums_tfm = drbd_crypto_alloc_digest_safe(mdev, | |
2887 | p->csums_alg, "csums-alg"); | |
2888 | if (IS_ERR(csums_tfm)) { | |
2889 | csums_tfm = NULL; | |
2890 | goto disconnect; | |
2891 | } | |
2892 | } | |
2893 | ||
2894 | ||
2895 | spin_lock(&mdev->peer_seq_lock); | |
2896 | /* lock against drbd_nl_syncer_conf() */ | |
2897 | if (verify_tfm) { | |
2898 | strcpy(mdev->sync_conf.verify_alg, p->verify_alg); | |
2899 | mdev->sync_conf.verify_alg_len = strlen(p->verify_alg) + 1; | |
2900 | crypto_free_hash(mdev->verify_tfm); | |
2901 | mdev->verify_tfm = verify_tfm; | |
2902 | dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg); | |
2903 | } | |
2904 | if (csums_tfm) { | |
2905 | strcpy(mdev->sync_conf.csums_alg, p->csums_alg); | |
2906 | mdev->sync_conf.csums_alg_len = strlen(p->csums_alg) + 1; | |
2907 | crypto_free_hash(mdev->csums_tfm); | |
2908 | mdev->csums_tfm = csums_tfm; | |
2909 | dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg); | |
2910 | } | |
2911 | spin_unlock(&mdev->peer_seq_lock); | |
2912 | } | |
2913 | ||
2914 | return ok; | |
2915 | disconnect: | |
2916 | /* just for completeness: actually not needed, | |
2917 | * as this is not reached if csums_tfm was ok. */ | |
2918 | crypto_free_hash(csums_tfm); | |
2919 | /* but free the verify_tfm again, if csums_tfm did not work out */ | |
2920 | crypto_free_hash(verify_tfm); | |
2921 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
2922 | return FALSE; | |
2923 | } | |
2924 | ||
2925 | static void drbd_setup_order_type(struct drbd_conf *mdev, int peer) | |
2926 | { | |
2927 | /* sorry, we currently have no working implementation | |
2928 | * of distributed TCQ */ | |
2929 | } | |
2930 | ||
2931 | /* warn if the arguments differ by more than 12.5% */ | |
2932 | static void warn_if_differ_considerably(struct drbd_conf *mdev, | |
2933 | const char *s, sector_t a, sector_t b) | |
2934 | { | |
2935 | sector_t d; | |
2936 | if (a == 0 || b == 0) | |
2937 | return; | |
2938 | d = (a > b) ? (a - b) : (b - a); | |
2939 | if (d > (a>>3) || d > (b>>3)) | |
2940 | dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s, | |
2941 | (unsigned long long)a, (unsigned long long)b); | |
2942 | } | |
2943 | ||
2944 | static int receive_sizes(struct drbd_conf *mdev, struct p_header *h) | |
2945 | { | |
2946 | struct p_sizes *p = (struct p_sizes *)h; | |
2947 | enum determine_dev_size dd = unchanged; | |
2948 | unsigned int max_seg_s; | |
2949 | sector_t p_size, p_usize, my_usize; | |
2950 | int ldsc = 0; /* local disk size changed */ | |
e89b591c | 2951 | enum dds_flags ddsf; |
b411b363 PR |
2952 | |
2953 | ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; | |
2954 | if (drbd_recv(mdev, h->payload, h->length) != h->length) | |
2955 | return FALSE; | |
2956 | ||
2957 | p_size = be64_to_cpu(p->d_size); | |
2958 | p_usize = be64_to_cpu(p->u_size); | |
2959 | ||
2960 | if (p_size == 0 && mdev->state.disk == D_DISKLESS) { | |
2961 | dev_err(DEV, "some backing storage is needed\n"); | |
2962 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
2963 | return FALSE; | |
2964 | } | |
2965 | ||
2966 | /* just store the peer's disk size for now. | |
2967 | * we still need to figure out whether we accept that. */ | |
2968 | mdev->p_size = p_size; | |
2969 | ||
2970 | #define min_not_zero(l, r) (l == 0) ? r : ((r == 0) ? l : min(l, r)) | |
2971 | if (get_ldev(mdev)) { | |
2972 | warn_if_differ_considerably(mdev, "lower level device sizes", | |
2973 | p_size, drbd_get_max_capacity(mdev->ldev)); | |
2974 | warn_if_differ_considerably(mdev, "user requested size", | |
2975 | p_usize, mdev->ldev->dc.disk_size); | |
2976 | ||
2977 | /* if this is the first connect, or an otherwise expected | |
2978 | * param exchange, choose the minimum */ | |
2979 | if (mdev->state.conn == C_WF_REPORT_PARAMS) | |
2980 | p_usize = min_not_zero((sector_t)mdev->ldev->dc.disk_size, | |
2981 | p_usize); | |
2982 | ||
2983 | my_usize = mdev->ldev->dc.disk_size; | |
2984 | ||
2985 | if (mdev->ldev->dc.disk_size != p_usize) { | |
2986 | mdev->ldev->dc.disk_size = p_usize; | |
2987 | dev_info(DEV, "Peer sets u_size to %lu sectors\n", | |
2988 | (unsigned long)mdev->ldev->dc.disk_size); | |
2989 | } | |
2990 | ||
2991 | /* Never shrink a device with usable data during connect. | |
2992 | But allow online shrinking if we are connected. */ | |
a393db6f | 2993 | if (drbd_new_dev_size(mdev, mdev->ldev, 0) < |
b411b363 PR |
2994 | drbd_get_capacity(mdev->this_bdev) && |
2995 | mdev->state.disk >= D_OUTDATED && | |
2996 | mdev->state.conn < C_CONNECTED) { | |
2997 | dev_err(DEV, "The peer's disk size is too small!\n"); | |
2998 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
2999 | mdev->ldev->dc.disk_size = my_usize; | |
3000 | put_ldev(mdev); | |
3001 | return FALSE; | |
3002 | } | |
3003 | put_ldev(mdev); | |
3004 | } | |
3005 | #undef min_not_zero | |
3006 | ||
e89b591c | 3007 | ddsf = be16_to_cpu(p->dds_flags); |
b411b363 | 3008 | if (get_ldev(mdev)) { |
e89b591c | 3009 | dd = drbd_determin_dev_size(mdev, ddsf); |
b411b363 PR |
3010 | put_ldev(mdev); |
3011 | if (dd == dev_size_error) | |
3012 | return FALSE; | |
3013 | drbd_md_sync(mdev); | |
3014 | } else { | |
3015 | /* I am diskless, need to accept the peer's size. */ | |
3016 | drbd_set_my_capacity(mdev, p_size); | |
3017 | } | |
3018 | ||
b411b363 PR |
3019 | if (get_ldev(mdev)) { |
3020 | if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { | |
3021 | mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); | |
3022 | ldsc = 1; | |
3023 | } | |
3024 | ||
a1c88d0d LE |
3025 | if (mdev->agreed_pro_version < 94) |
3026 | max_seg_s = be32_to_cpu(p->max_segment_size); | |
3027 | else /* drbd 8.3.8 onwards */ | |
3028 | max_seg_s = DRBD_MAX_SEGMENT_SIZE; | |
3029 | ||
b411b363 PR |
3030 | if (max_seg_s != queue_max_segment_size(mdev->rq_queue)) |
3031 | drbd_setup_queue_param(mdev, max_seg_s); | |
3032 | ||
e89b591c | 3033 | drbd_setup_order_type(mdev, be16_to_cpu(p->queue_order_type)); |
b411b363 PR |
3034 | put_ldev(mdev); |
3035 | } | |
3036 | ||
3037 | if (mdev->state.conn > C_WF_REPORT_PARAMS) { | |
3038 | if (be64_to_cpu(p->c_size) != | |
3039 | drbd_get_capacity(mdev->this_bdev) || ldsc) { | |
3040 | /* we have different sizes, probably peer | |
3041 | * needs to know my new size... */ | |
e89b591c | 3042 | drbd_send_sizes(mdev, 0, ddsf); |
b411b363 PR |
3043 | } |
3044 | if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) || | |
3045 | (dd == grew && mdev->state.conn == C_CONNECTED)) { | |
3046 | if (mdev->state.pdsk >= D_INCONSISTENT && | |
e89b591c PR |
3047 | mdev->state.disk >= D_INCONSISTENT) { |
3048 | if (ddsf & DDSF_NO_RESYNC) | |
3049 | dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n"); | |
3050 | else | |
3051 | resync_after_online_grow(mdev); | |
3052 | } else | |
b411b363 PR |
3053 | set_bit(RESYNC_AFTER_NEG, &mdev->flags); |
3054 | } | |
3055 | } | |
3056 | ||
3057 | return TRUE; | |
3058 | } | |
3059 | ||
3060 | static int receive_uuids(struct drbd_conf *mdev, struct p_header *h) | |
3061 | { | |
3062 | struct p_uuids *p = (struct p_uuids *)h; | |
3063 | u64 *p_uuid; | |
3064 | int i; | |
3065 | ||
3066 | ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; | |
3067 | if (drbd_recv(mdev, h->payload, h->length) != h->length) | |
3068 | return FALSE; | |
3069 | ||
3070 | p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); | |
3071 | ||
3072 | for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) | |
3073 | p_uuid[i] = be64_to_cpu(p->uuid[i]); | |
3074 | ||
3075 | kfree(mdev->p_uuid); | |
3076 | mdev->p_uuid = p_uuid; | |
3077 | ||
3078 | if (mdev->state.conn < C_CONNECTED && | |
3079 | mdev->state.disk < D_INCONSISTENT && | |
3080 | mdev->state.role == R_PRIMARY && | |
3081 | (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { | |
3082 | dev_err(DEV, "Can only connect to data with current UUID=%016llX\n", | |
3083 | (unsigned long long)mdev->ed_uuid); | |
3084 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
3085 | return FALSE; | |
3086 | } | |
3087 | ||
3088 | if (get_ldev(mdev)) { | |
3089 | int skip_initial_sync = | |
3090 | mdev->state.conn == C_CONNECTED && | |
3091 | mdev->agreed_pro_version >= 90 && | |
3092 | mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && | |
3093 | (p_uuid[UI_FLAGS] & 8); | |
3094 | if (skip_initial_sync) { | |
3095 | dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n"); | |
3096 | drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, | |
3097 | "clear_n_write from receive_uuids"); | |
3098 | _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]); | |
3099 | _drbd_uuid_set(mdev, UI_BITMAP, 0); | |
3100 | _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), | |
3101 | CS_VERBOSE, NULL); | |
3102 | drbd_md_sync(mdev); | |
3103 | } | |
3104 | put_ldev(mdev); | |
3105 | } | |
3106 | ||
3107 | /* Before we test for the disk state, we should wait until an eventually | |
3108 | ongoing cluster wide state change is finished. That is important if | |
3109 | we are primary and are detaching from our disk. We need to see the | |
3110 | new disk state... */ | |
3111 | wait_event(mdev->misc_wait, !test_bit(CLUSTER_ST_CHANGE, &mdev->flags)); | |
3112 | if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT) | |
3113 | drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); | |
3114 | ||
3115 | return TRUE; | |
3116 | } | |
3117 | ||
3118 | /** | |
3119 | * convert_state() - Converts the peer's view of the cluster state to our point of view | |
3120 | * @ps: The state as seen by the peer. | |
3121 | */ | |
3122 | static union drbd_state convert_state(union drbd_state ps) | |
3123 | { | |
3124 | union drbd_state ms; | |
3125 | ||
3126 | static enum drbd_conns c_tab[] = { | |
3127 | [C_CONNECTED] = C_CONNECTED, | |
3128 | ||
3129 | [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, | |
3130 | [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, | |
3131 | [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ | |
3132 | [C_VERIFY_S] = C_VERIFY_T, | |
3133 | [C_MASK] = C_MASK, | |
3134 | }; | |
3135 | ||
3136 | ms.i = ps.i; | |
3137 | ||
3138 | ms.conn = c_tab[ps.conn]; | |
3139 | ms.peer = ps.role; | |
3140 | ms.role = ps.peer; | |
3141 | ms.pdsk = ps.disk; | |
3142 | ms.disk = ps.pdsk; | |
3143 | ms.peer_isp = (ps.aftr_isp | ps.user_isp); | |
3144 | ||
3145 | return ms; | |
3146 | } | |
3147 | ||
3148 | static int receive_req_state(struct drbd_conf *mdev, struct p_header *h) | |
3149 | { | |
3150 | struct p_req_state *p = (struct p_req_state *)h; | |
3151 | union drbd_state mask, val; | |
3152 | int rv; | |
3153 | ||
3154 | ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; | |
3155 | if (drbd_recv(mdev, h->payload, h->length) != h->length) | |
3156 | return FALSE; | |
3157 | ||
3158 | mask.i = be32_to_cpu(p->mask); | |
3159 | val.i = be32_to_cpu(p->val); | |
3160 | ||
3161 | if (test_bit(DISCARD_CONCURRENT, &mdev->flags) && | |
3162 | test_bit(CLUSTER_ST_CHANGE, &mdev->flags)) { | |
3163 | drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG); | |
3164 | return TRUE; | |
3165 | } | |
3166 | ||
3167 | mask = convert_state(mask); | |
3168 | val = convert_state(val); | |
3169 | ||
3170 | rv = drbd_change_state(mdev, CS_VERBOSE, mask, val); | |
3171 | ||
3172 | drbd_send_sr_reply(mdev, rv); | |
3173 | drbd_md_sync(mdev); | |
3174 | ||
3175 | return TRUE; | |
3176 | } | |
3177 | ||
3178 | static int receive_state(struct drbd_conf *mdev, struct p_header *h) | |
3179 | { | |
3180 | struct p_state *p = (struct p_state *)h; | |
3181 | enum drbd_conns nconn, oconn; | |
3182 | union drbd_state ns, peer_state; | |
3183 | enum drbd_disk_state real_peer_disk; | |
3184 | int rv; | |
3185 | ||
3186 | ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) | |
3187 | return FALSE; | |
3188 | ||
3189 | if (drbd_recv(mdev, h->payload, h->length) != h->length) | |
3190 | return FALSE; | |
3191 | ||
3192 | peer_state.i = be32_to_cpu(p->state); | |
3193 | ||
3194 | real_peer_disk = peer_state.disk; | |
3195 | if (peer_state.disk == D_NEGOTIATING) { | |
3196 | real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; | |
3197 | dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); | |
3198 | } | |
3199 | ||
3200 | spin_lock_irq(&mdev->req_lock); | |
3201 | retry: | |
3202 | oconn = nconn = mdev->state.conn; | |
3203 | spin_unlock_irq(&mdev->req_lock); | |
3204 | ||
3205 | if (nconn == C_WF_REPORT_PARAMS) | |
3206 | nconn = C_CONNECTED; | |
3207 | ||
3208 | if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING && | |
3209 | get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
3210 | int cr; /* consider resync */ | |
3211 | ||
3212 | /* if we established a new connection */ | |
3213 | cr = (oconn < C_CONNECTED); | |
3214 | /* if we had an established connection | |
3215 | * and one of the nodes newly attaches a disk */ | |
3216 | cr |= (oconn == C_CONNECTED && | |
3217 | (peer_state.disk == D_NEGOTIATING || | |
3218 | mdev->state.disk == D_NEGOTIATING)); | |
3219 | /* if we have both been inconsistent, and the peer has been | |
3220 | * forced to be UpToDate with --overwrite-data */ | |
3221 | cr |= test_bit(CONSIDER_RESYNC, &mdev->flags); | |
3222 | /* if we had been plain connected, and the admin requested to | |
3223 | * start a sync by "invalidate" or "invalidate-remote" */ | |
3224 | cr |= (oconn == C_CONNECTED && | |
3225 | (peer_state.conn >= C_STARTING_SYNC_S && | |
3226 | peer_state.conn <= C_WF_BITMAP_T)); | |
3227 | ||
3228 | if (cr) | |
3229 | nconn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk); | |
3230 | ||
3231 | put_ldev(mdev); | |
3232 | if (nconn == C_MASK) { | |
580b9767 | 3233 | nconn = C_CONNECTED; |
b411b363 PR |
3234 | if (mdev->state.disk == D_NEGOTIATING) { |
3235 | drbd_force_state(mdev, NS(disk, D_DISKLESS)); | |
b411b363 PR |
3236 | } else if (peer_state.disk == D_NEGOTIATING) { |
3237 | dev_err(DEV, "Disk attach process on the peer node was aborted.\n"); | |
3238 | peer_state.disk = D_DISKLESS; | |
580b9767 | 3239 | real_peer_disk = D_DISKLESS; |
b411b363 | 3240 | } else { |
cf14c2e9 PR |
3241 | if (test_and_clear_bit(CONN_DRY_RUN, &mdev->flags)) |
3242 | return FALSE; | |
b411b363 PR |
3243 | D_ASSERT(oconn == C_WF_REPORT_PARAMS); |
3244 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
3245 | return FALSE; | |
3246 | } | |
3247 | } | |
3248 | } | |
3249 | ||
3250 | spin_lock_irq(&mdev->req_lock); | |
3251 | if (mdev->state.conn != oconn) | |
3252 | goto retry; | |
3253 | clear_bit(CONSIDER_RESYNC, &mdev->flags); | |
3254 | ns.i = mdev->state.i; | |
3255 | ns.conn = nconn; | |
3256 | ns.peer = peer_state.role; | |
3257 | ns.pdsk = real_peer_disk; | |
3258 | ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); | |
3259 | if ((nconn == C_CONNECTED || nconn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) | |
3260 | ns.disk = mdev->new_state_tmp.disk; | |
3261 | ||
3262 | rv = _drbd_set_state(mdev, ns, CS_VERBOSE | CS_HARD, NULL); | |
3263 | ns = mdev->state; | |
3264 | spin_unlock_irq(&mdev->req_lock); | |
3265 | ||
3266 | if (rv < SS_SUCCESS) { | |
3267 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
3268 | return FALSE; | |
3269 | } | |
3270 | ||
3271 | if (oconn > C_WF_REPORT_PARAMS) { | |
3272 | if (nconn > C_CONNECTED && peer_state.conn <= C_CONNECTED && | |
3273 | peer_state.disk != D_NEGOTIATING ) { | |
3274 | /* we want resync, peer has not yet decided to sync... */ | |
3275 | /* Nowadays only used when forcing a node into primary role and | |
3276 | setting its disk to UpToDate with that */ | |
3277 | drbd_send_uuids(mdev); | |
3278 | drbd_send_state(mdev); | |
3279 | } | |
3280 | } | |
3281 | ||
3282 | mdev->net_conf->want_lose = 0; | |
3283 | ||
3284 | drbd_md_sync(mdev); /* update connected indicator, la_size, ... */ | |
3285 | ||
3286 | return TRUE; | |
3287 | } | |
3288 | ||
3289 | static int receive_sync_uuid(struct drbd_conf *mdev, struct p_header *h) | |
3290 | { | |
3291 | struct p_rs_uuid *p = (struct p_rs_uuid *)h; | |
3292 | ||
3293 | wait_event(mdev->misc_wait, | |
3294 | mdev->state.conn == C_WF_SYNC_UUID || | |
3295 | mdev->state.conn < C_CONNECTED || | |
3296 | mdev->state.disk < D_NEGOTIATING); | |
3297 | ||
3298 | /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */ | |
3299 | ||
3300 | ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; | |
3301 | if (drbd_recv(mdev, h->payload, h->length) != h->length) | |
3302 | return FALSE; | |
3303 | ||
3304 | /* Here the _drbd_uuid_ functions are right, current should | |
3305 | _not_ be rotated into the history */ | |
3306 | if (get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
3307 | _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid)); | |
3308 | _drbd_uuid_set(mdev, UI_BITMAP, 0UL); | |
3309 | ||
3310 | drbd_start_resync(mdev, C_SYNC_TARGET); | |
3311 | ||
3312 | put_ldev(mdev); | |
3313 | } else | |
3314 | dev_err(DEV, "Ignoring SyncUUID packet!\n"); | |
3315 | ||
3316 | return TRUE; | |
3317 | } | |
3318 | ||
3319 | enum receive_bitmap_ret { OK, DONE, FAILED }; | |
3320 | ||
3321 | static enum receive_bitmap_ret | |
3322 | receive_bitmap_plain(struct drbd_conf *mdev, struct p_header *h, | |
3323 | unsigned long *buffer, struct bm_xfer_ctx *c) | |
3324 | { | |
3325 | unsigned num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset); | |
3326 | unsigned want = num_words * sizeof(long); | |
3327 | ||
3328 | if (want != h->length) { | |
3329 | dev_err(DEV, "%s:want (%u) != h->length (%u)\n", __func__, want, h->length); | |
3330 | return FAILED; | |
3331 | } | |
3332 | if (want == 0) | |
3333 | return DONE; | |
3334 | if (drbd_recv(mdev, buffer, want) != want) | |
3335 | return FAILED; | |
3336 | ||
3337 | drbd_bm_merge_lel(mdev, c->word_offset, num_words, buffer); | |
3338 | ||
3339 | c->word_offset += num_words; | |
3340 | c->bit_offset = c->word_offset * BITS_PER_LONG; | |
3341 | if (c->bit_offset > c->bm_bits) | |
3342 | c->bit_offset = c->bm_bits; | |
3343 | ||
3344 | return OK; | |
3345 | } | |
3346 | ||
3347 | static enum receive_bitmap_ret | |
3348 | recv_bm_rle_bits(struct drbd_conf *mdev, | |
3349 | struct p_compressed_bm *p, | |
3350 | struct bm_xfer_ctx *c) | |
3351 | { | |
3352 | struct bitstream bs; | |
3353 | u64 look_ahead; | |
3354 | u64 rl; | |
3355 | u64 tmp; | |
3356 | unsigned long s = c->bit_offset; | |
3357 | unsigned long e; | |
3358 | int len = p->head.length - (sizeof(*p) - sizeof(p->head)); | |
3359 | int toggle = DCBP_get_start(p); | |
3360 | int have; | |
3361 | int bits; | |
3362 | ||
3363 | bitstream_init(&bs, p->code, len, DCBP_get_pad_bits(p)); | |
3364 | ||
3365 | bits = bitstream_get_bits(&bs, &look_ahead, 64); | |
3366 | if (bits < 0) | |
3367 | return FAILED; | |
3368 | ||
3369 | for (have = bits; have > 0; s += rl, toggle = !toggle) { | |
3370 | bits = vli_decode_bits(&rl, look_ahead); | |
3371 | if (bits <= 0) | |
3372 | return FAILED; | |
3373 | ||
3374 | if (toggle) { | |
3375 | e = s + rl -1; | |
3376 | if (e >= c->bm_bits) { | |
3377 | dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); | |
3378 | return FAILED; | |
3379 | } | |
3380 | _drbd_bm_set_bits(mdev, s, e); | |
3381 | } | |
3382 | ||
3383 | if (have < bits) { | |
3384 | dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", | |
3385 | have, bits, look_ahead, | |
3386 | (unsigned int)(bs.cur.b - p->code), | |
3387 | (unsigned int)bs.buf_len); | |
3388 | return FAILED; | |
3389 | } | |
3390 | look_ahead >>= bits; | |
3391 | have -= bits; | |
3392 | ||
3393 | bits = bitstream_get_bits(&bs, &tmp, 64 - have); | |
3394 | if (bits < 0) | |
3395 | return FAILED; | |
3396 | look_ahead |= tmp << have; | |
3397 | have += bits; | |
3398 | } | |
3399 | ||
3400 | c->bit_offset = s; | |
3401 | bm_xfer_ctx_bit_to_word_offset(c); | |
3402 | ||
3403 | return (s == c->bm_bits) ? DONE : OK; | |
3404 | } | |
3405 | ||
3406 | static enum receive_bitmap_ret | |
3407 | decode_bitmap_c(struct drbd_conf *mdev, | |
3408 | struct p_compressed_bm *p, | |
3409 | struct bm_xfer_ctx *c) | |
3410 | { | |
3411 | if (DCBP_get_code(p) == RLE_VLI_Bits) | |
3412 | return recv_bm_rle_bits(mdev, p, c); | |
3413 | ||
3414 | /* other variants had been implemented for evaluation, | |
3415 | * but have been dropped as this one turned out to be "best" | |
3416 | * during all our tests. */ | |
3417 | ||
3418 | dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding); | |
3419 | drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); | |
3420 | return FAILED; | |
3421 | } | |
3422 | ||
3423 | void INFO_bm_xfer_stats(struct drbd_conf *mdev, | |
3424 | const char *direction, struct bm_xfer_ctx *c) | |
3425 | { | |
3426 | /* what would it take to transfer it "plaintext" */ | |
3427 | unsigned plain = sizeof(struct p_header) * | |
3428 | ((c->bm_words+BM_PACKET_WORDS-1)/BM_PACKET_WORDS+1) | |
3429 | + c->bm_words * sizeof(long); | |
3430 | unsigned total = c->bytes[0] + c->bytes[1]; | |
3431 | unsigned r; | |
3432 | ||
3433 | /* total can not be zero. but just in case: */ | |
3434 | if (total == 0) | |
3435 | return; | |
3436 | ||
3437 | /* don't report if not compressed */ | |
3438 | if (total >= plain) | |
3439 | return; | |
3440 | ||
3441 | /* total < plain. check for overflow, still */ | |
3442 | r = (total > UINT_MAX/1000) ? (total / (plain/1000)) | |
3443 | : (1000 * total / plain); | |
3444 | ||
3445 | if (r > 1000) | |
3446 | r = 1000; | |
3447 | ||
3448 | r = 1000 - r; | |
3449 | dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " | |
3450 | "total %u; compression: %u.%u%%\n", | |
3451 | direction, | |
3452 | c->bytes[1], c->packets[1], | |
3453 | c->bytes[0], c->packets[0], | |
3454 | total, r/10, r % 10); | |
3455 | } | |
3456 | ||
3457 | /* Since we are processing the bitfield from lower addresses to higher, | |
3458 | it does not matter if the process it in 32 bit chunks or 64 bit | |
3459 | chunks as long as it is little endian. (Understand it as byte stream, | |
3460 | beginning with the lowest byte...) If we would use big endian | |
3461 | we would need to process it from the highest address to the lowest, | |
3462 | in order to be agnostic to the 32 vs 64 bits issue. | |
3463 | ||
3464 | returns 0 on failure, 1 if we successfully received it. */ | |
3465 | static int receive_bitmap(struct drbd_conf *mdev, struct p_header *h) | |
3466 | { | |
3467 | struct bm_xfer_ctx c; | |
3468 | void *buffer; | |
3469 | enum receive_bitmap_ret ret; | |
3470 | int ok = FALSE; | |
3471 | ||
3472 | wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt)); | |
3473 | ||
3474 | drbd_bm_lock(mdev, "receive bitmap"); | |
3475 | ||
3476 | /* maybe we should use some per thread scratch page, | |
3477 | * and allocate that during initial device creation? */ | |
3478 | buffer = (unsigned long *) __get_free_page(GFP_NOIO); | |
3479 | if (!buffer) { | |
3480 | dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__); | |
3481 | goto out; | |
3482 | } | |
3483 | ||
3484 | c = (struct bm_xfer_ctx) { | |
3485 | .bm_bits = drbd_bm_bits(mdev), | |
3486 | .bm_words = drbd_bm_words(mdev), | |
3487 | }; | |
3488 | ||
3489 | do { | |
3490 | if (h->command == P_BITMAP) { | |
3491 | ret = receive_bitmap_plain(mdev, h, buffer, &c); | |
3492 | } else if (h->command == P_COMPRESSED_BITMAP) { | |
3493 | /* MAYBE: sanity check that we speak proto >= 90, | |
3494 | * and the feature is enabled! */ | |
3495 | struct p_compressed_bm *p; | |
3496 | ||
3497 | if (h->length > BM_PACKET_PAYLOAD_BYTES) { | |
3498 | dev_err(DEV, "ReportCBitmap packet too large\n"); | |
3499 | goto out; | |
3500 | } | |
3501 | /* use the page buff */ | |
3502 | p = buffer; | |
3503 | memcpy(p, h, sizeof(*h)); | |
3504 | if (drbd_recv(mdev, p->head.payload, h->length) != h->length) | |
3505 | goto out; | |
3506 | if (p->head.length <= (sizeof(*p) - sizeof(p->head))) { | |
3507 | dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", p->head.length); | |
3508 | return FAILED; | |
3509 | } | |
3510 | ret = decode_bitmap_c(mdev, p, &c); | |
3511 | } else { | |
3512 | dev_warn(DEV, "receive_bitmap: h->command neither ReportBitMap nor ReportCBitMap (is 0x%x)", h->command); | |
3513 | goto out; | |
3514 | } | |
3515 | ||
3516 | c.packets[h->command == P_BITMAP]++; | |
3517 | c.bytes[h->command == P_BITMAP] += sizeof(struct p_header) + h->length; | |
3518 | ||
3519 | if (ret != OK) | |
3520 | break; | |
3521 | ||
3522 | if (!drbd_recv_header(mdev, h)) | |
3523 | goto out; | |
3524 | } while (ret == OK); | |
3525 | if (ret == FAILED) | |
3526 | goto out; | |
3527 | ||
3528 | INFO_bm_xfer_stats(mdev, "receive", &c); | |
3529 | ||
3530 | if (mdev->state.conn == C_WF_BITMAP_T) { | |
3531 | ok = !drbd_send_bitmap(mdev); | |
3532 | if (!ok) | |
3533 | goto out; | |
3534 | /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ | |
3535 | ok = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); | |
3536 | D_ASSERT(ok == SS_SUCCESS); | |
3537 | } else if (mdev->state.conn != C_WF_BITMAP_S) { | |
3538 | /* admin may have requested C_DISCONNECTING, | |
3539 | * other threads may have noticed network errors */ | |
3540 | dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n", | |
3541 | drbd_conn_str(mdev->state.conn)); | |
3542 | } | |
3543 | ||
3544 | ok = TRUE; | |
3545 | out: | |
3546 | drbd_bm_unlock(mdev); | |
3547 | if (ok && mdev->state.conn == C_WF_BITMAP_S) | |
3548 | drbd_start_resync(mdev, C_SYNC_SOURCE); | |
3549 | free_page((unsigned long) buffer); | |
3550 | return ok; | |
3551 | } | |
3552 | ||
3553 | static int receive_skip(struct drbd_conf *mdev, struct p_header *h) | |
3554 | { | |
3555 | /* TODO zero copy sink :) */ | |
3556 | static char sink[128]; | |
3557 | int size, want, r; | |
3558 | ||
3559 | dev_warn(DEV, "skipping unknown optional packet type %d, l: %d!\n", | |
3560 | h->command, h->length); | |
3561 | ||
3562 | size = h->length; | |
3563 | while (size > 0) { | |
3564 | want = min_t(int, size, sizeof(sink)); | |
3565 | r = drbd_recv(mdev, sink, want); | |
3566 | ERR_IF(r <= 0) break; | |
3567 | size -= r; | |
3568 | } | |
3569 | return size == 0; | |
3570 | } | |
3571 | ||
3572 | static int receive_UnplugRemote(struct drbd_conf *mdev, struct p_header *h) | |
3573 | { | |
3574 | if (mdev->state.disk >= D_INCONSISTENT) | |
3575 | drbd_kick_lo(mdev); | |
3576 | ||
3577 | /* Make sure we've acked all the TCP data associated | |
3578 | * with the data requests being unplugged */ | |
3579 | drbd_tcp_quickack(mdev->data.socket); | |
3580 | ||
3581 | return TRUE; | |
3582 | } | |
3583 | ||
0ced55a3 PR |
3584 | static void timeval_sub_us(struct timeval* tv, unsigned int us) |
3585 | { | |
3586 | tv->tv_sec -= us / 1000000; | |
3587 | us = us % 1000000; | |
3588 | if (tv->tv_usec > us) { | |
3589 | tv->tv_usec += 1000000; | |
3590 | tv->tv_sec--; | |
3591 | } | |
3592 | tv->tv_usec -= us; | |
3593 | } | |
3594 | ||
3595 | static void got_delay_probe(struct drbd_conf *mdev, int from, struct p_delay_probe *p) | |
3596 | { | |
3597 | struct delay_probe *dp; | |
3598 | struct list_head *le; | |
3599 | struct timeval now; | |
3600 | int seq_num; | |
3601 | int offset; | |
3602 | int data_delay; | |
3603 | ||
3604 | seq_num = be32_to_cpu(p->seq_num); | |
3605 | offset = be32_to_cpu(p->offset); | |
3606 | ||
3607 | spin_lock(&mdev->peer_seq_lock); | |
3608 | if (!list_empty(&mdev->delay_probes)) { | |
3609 | if (from == USE_DATA_SOCKET) | |
3610 | le = mdev->delay_probes.next; | |
3611 | else | |
3612 | le = mdev->delay_probes.prev; | |
3613 | ||
3614 | dp = list_entry(le, struct delay_probe, list); | |
3615 | ||
3616 | if (dp->seq_num == seq_num) { | |
3617 | list_del(le); | |
3618 | spin_unlock(&mdev->peer_seq_lock); | |
3619 | do_gettimeofday(&now); | |
3620 | timeval_sub_us(&now, offset); | |
3621 | data_delay = | |
3622 | now.tv_usec - dp->time.tv_usec + | |
3623 | (now.tv_sec - dp->time.tv_sec) * 1000000; | |
3624 | ||
3625 | if (data_delay > 0) | |
3626 | mdev->data_delay = data_delay; | |
3627 | ||
3628 | kfree(dp); | |
3629 | return; | |
3630 | } | |
3631 | ||
3632 | if (dp->seq_num > seq_num) { | |
3633 | spin_unlock(&mdev->peer_seq_lock); | |
3634 | dev_warn(DEV, "Previous allocation failure of struct delay_probe?\n"); | |
3635 | return; /* Do not alloca a struct delay_probe.... */ | |
3636 | } | |
3637 | } | |
3638 | spin_unlock(&mdev->peer_seq_lock); | |
3639 | ||
3640 | dp = kmalloc(sizeof(struct delay_probe), GFP_NOIO); | |
3641 | if (!dp) { | |
3642 | dev_warn(DEV, "Failed to allocate a struct delay_probe, do not worry.\n"); | |
3643 | return; | |
3644 | } | |
3645 | ||
3646 | dp->seq_num = seq_num; | |
3647 | do_gettimeofday(&dp->time); | |
3648 | timeval_sub_us(&dp->time, offset); | |
3649 | ||
3650 | spin_lock(&mdev->peer_seq_lock); | |
3651 | if (from == USE_DATA_SOCKET) | |
3652 | list_add(&dp->list, &mdev->delay_probes); | |
3653 | else | |
3654 | list_add_tail(&dp->list, &mdev->delay_probes); | |
3655 | spin_unlock(&mdev->peer_seq_lock); | |
3656 | } | |
3657 | ||
3658 | static int receive_delay_probe(struct drbd_conf *mdev, struct p_header *h) | |
3659 | { | |
3660 | struct p_delay_probe *p = (struct p_delay_probe *)h; | |
3661 | ||
3662 | ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE; | |
3663 | if (drbd_recv(mdev, h->payload, h->length) != h->length) | |
3664 | return FALSE; | |
3665 | ||
3666 | got_delay_probe(mdev, USE_DATA_SOCKET, p); | |
3667 | return TRUE; | |
3668 | } | |
3669 | ||
b411b363 PR |
3670 | typedef int (*drbd_cmd_handler_f)(struct drbd_conf *, struct p_header *); |
3671 | ||
3672 | static drbd_cmd_handler_f drbd_default_handler[] = { | |
3673 | [P_DATA] = receive_Data, | |
3674 | [P_DATA_REPLY] = receive_DataReply, | |
3675 | [P_RS_DATA_REPLY] = receive_RSDataReply, | |
3676 | [P_BARRIER] = receive_Barrier, | |
3677 | [P_BITMAP] = receive_bitmap, | |
3678 | [P_COMPRESSED_BITMAP] = receive_bitmap, | |
3679 | [P_UNPLUG_REMOTE] = receive_UnplugRemote, | |
3680 | [P_DATA_REQUEST] = receive_DataRequest, | |
3681 | [P_RS_DATA_REQUEST] = receive_DataRequest, | |
3682 | [P_SYNC_PARAM] = receive_SyncParam, | |
3683 | [P_SYNC_PARAM89] = receive_SyncParam, | |
3684 | [P_PROTOCOL] = receive_protocol, | |
3685 | [P_UUIDS] = receive_uuids, | |
3686 | [P_SIZES] = receive_sizes, | |
3687 | [P_STATE] = receive_state, | |
3688 | [P_STATE_CHG_REQ] = receive_req_state, | |
3689 | [P_SYNC_UUID] = receive_sync_uuid, | |
3690 | [P_OV_REQUEST] = receive_DataRequest, | |
3691 | [P_OV_REPLY] = receive_DataRequest, | |
3692 | [P_CSUM_RS_REQUEST] = receive_DataRequest, | |
0ced55a3 | 3693 | [P_DELAY_PROBE] = receive_delay_probe, |
b411b363 PR |
3694 | /* anything missing from this table is in |
3695 | * the asender_tbl, see get_asender_cmd */ | |
3696 | [P_MAX_CMD] = NULL, | |
3697 | }; | |
3698 | ||
3699 | static drbd_cmd_handler_f *drbd_cmd_handler = drbd_default_handler; | |
3700 | static drbd_cmd_handler_f *drbd_opt_cmd_handler; | |
3701 | ||
3702 | static void drbdd(struct drbd_conf *mdev) | |
3703 | { | |
3704 | drbd_cmd_handler_f handler; | |
3705 | struct p_header *header = &mdev->data.rbuf.header; | |
3706 | ||
3707 | while (get_t_state(&mdev->receiver) == Running) { | |
3708 | drbd_thread_current_set_cpu(mdev); | |
0b33a916 LE |
3709 | if (!drbd_recv_header(mdev, header)) { |
3710 | drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); | |
b411b363 | 3711 | break; |
0b33a916 | 3712 | } |
b411b363 PR |
3713 | |
3714 | if (header->command < P_MAX_CMD) | |
3715 | handler = drbd_cmd_handler[header->command]; | |
3716 | else if (P_MAY_IGNORE < header->command | |
3717 | && header->command < P_MAX_OPT_CMD) | |
3718 | handler = drbd_opt_cmd_handler[header->command-P_MAY_IGNORE]; | |
3719 | else if (header->command > P_MAX_OPT_CMD) | |
3720 | handler = receive_skip; | |
3721 | else | |
3722 | handler = NULL; | |
3723 | ||
3724 | if (unlikely(!handler)) { | |
3725 | dev_err(DEV, "unknown packet type %d, l: %d!\n", | |
3726 | header->command, header->length); | |
3727 | drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); | |
3728 | break; | |
3729 | } | |
3730 | if (unlikely(!handler(mdev, header))) { | |
3731 | dev_err(DEV, "error receiving %s, l: %d!\n", | |
3732 | cmdname(header->command), header->length); | |
3733 | drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); | |
3734 | break; | |
3735 | } | |
b411b363 PR |
3736 | } |
3737 | } | |
3738 | ||
3739 | static void drbd_fail_pending_reads(struct drbd_conf *mdev) | |
3740 | { | |
3741 | struct hlist_head *slot; | |
3742 | struct hlist_node *pos; | |
3743 | struct hlist_node *tmp; | |
3744 | struct drbd_request *req; | |
3745 | int i; | |
3746 | ||
3747 | /* | |
3748 | * Application READ requests | |
3749 | */ | |
3750 | spin_lock_irq(&mdev->req_lock); | |
3751 | for (i = 0; i < APP_R_HSIZE; i++) { | |
3752 | slot = mdev->app_reads_hash+i; | |
3753 | hlist_for_each_entry_safe(req, pos, tmp, slot, colision) { | |
3754 | /* it may (but should not any longer!) | |
3755 | * be on the work queue; if that assert triggers, | |
3756 | * we need to also grab the | |
3757 | * spin_lock_irq(&mdev->data.work.q_lock); | |
3758 | * and list_del_init here. */ | |
3759 | D_ASSERT(list_empty(&req->w.list)); | |
3760 | /* It would be nice to complete outside of spinlock. | |
3761 | * But this is easier for now. */ | |
3762 | _req_mod(req, connection_lost_while_pending); | |
3763 | } | |
3764 | } | |
3765 | for (i = 0; i < APP_R_HSIZE; i++) | |
3766 | if (!hlist_empty(mdev->app_reads_hash+i)) | |
3767 | dev_warn(DEV, "ASSERT FAILED: app_reads_hash[%d].first: " | |
3768 | "%p, should be NULL\n", i, mdev->app_reads_hash[i].first); | |
3769 | ||
3770 | memset(mdev->app_reads_hash, 0, APP_R_HSIZE*sizeof(void *)); | |
3771 | spin_unlock_irq(&mdev->req_lock); | |
3772 | } | |
3773 | ||
3774 | void drbd_flush_workqueue(struct drbd_conf *mdev) | |
3775 | { | |
3776 | struct drbd_wq_barrier barr; | |
3777 | ||
3778 | barr.w.cb = w_prev_work_done; | |
3779 | init_completion(&barr.done); | |
3780 | drbd_queue_work(&mdev->data.work, &barr.w); | |
3781 | wait_for_completion(&barr.done); | |
3782 | } | |
3783 | ||
3784 | static void drbd_disconnect(struct drbd_conf *mdev) | |
3785 | { | |
3786 | enum drbd_fencing_p fp; | |
3787 | union drbd_state os, ns; | |
3788 | int rv = SS_UNKNOWN_ERROR; | |
3789 | unsigned int i; | |
3790 | ||
3791 | if (mdev->state.conn == C_STANDALONE) | |
3792 | return; | |
3793 | if (mdev->state.conn >= C_WF_CONNECTION) | |
3794 | dev_err(DEV, "ASSERT FAILED cstate = %s, expected < WFConnection\n", | |
3795 | drbd_conn_str(mdev->state.conn)); | |
3796 | ||
3797 | /* asender does not clean up anything. it must not interfere, either */ | |
3798 | drbd_thread_stop(&mdev->asender); | |
b411b363 | 3799 | drbd_free_sock(mdev); |
b411b363 PR |
3800 | |
3801 | spin_lock_irq(&mdev->req_lock); | |
3802 | _drbd_wait_ee_list_empty(mdev, &mdev->active_ee); | |
3803 | _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee); | |
3804 | _drbd_wait_ee_list_empty(mdev, &mdev->read_ee); | |
3805 | spin_unlock_irq(&mdev->req_lock); | |
3806 | ||
3807 | /* We do not have data structures that would allow us to | |
3808 | * get the rs_pending_cnt down to 0 again. | |
3809 | * * On C_SYNC_TARGET we do not have any data structures describing | |
3810 | * the pending RSDataRequest's we have sent. | |
3811 | * * On C_SYNC_SOURCE there is no data structure that tracks | |
3812 | * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. | |
3813 | * And no, it is not the sum of the reference counts in the | |
3814 | * resync_LRU. The resync_LRU tracks the whole operation including | |
3815 | * the disk-IO, while the rs_pending_cnt only tracks the blocks | |
3816 | * on the fly. */ | |
3817 | drbd_rs_cancel_all(mdev); | |
3818 | mdev->rs_total = 0; | |
3819 | mdev->rs_failed = 0; | |
3820 | atomic_set(&mdev->rs_pending_cnt, 0); | |
3821 | wake_up(&mdev->misc_wait); | |
3822 | ||
3823 | /* make sure syncer is stopped and w_resume_next_sg queued */ | |
3824 | del_timer_sync(&mdev->resync_timer); | |
3825 | set_bit(STOP_SYNC_TIMER, &mdev->flags); | |
3826 | resync_timer_fn((unsigned long)mdev); | |
3827 | ||
b411b363 PR |
3828 | /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, |
3829 | * w_make_resync_request etc. which may still be on the worker queue | |
3830 | * to be "canceled" */ | |
3831 | drbd_flush_workqueue(mdev); | |
3832 | ||
3833 | /* This also does reclaim_net_ee(). If we do this too early, we might | |
3834 | * miss some resync ee and pages.*/ | |
3835 | drbd_process_done_ee(mdev); | |
3836 | ||
3837 | kfree(mdev->p_uuid); | |
3838 | mdev->p_uuid = NULL; | |
3839 | ||
3840 | if (!mdev->state.susp) | |
3841 | tl_clear(mdev); | |
3842 | ||
3843 | drbd_fail_pending_reads(mdev); | |
3844 | ||
3845 | dev_info(DEV, "Connection closed\n"); | |
3846 | ||
3847 | drbd_md_sync(mdev); | |
3848 | ||
3849 | fp = FP_DONT_CARE; | |
3850 | if (get_ldev(mdev)) { | |
3851 | fp = mdev->ldev->dc.fencing; | |
3852 | put_ldev(mdev); | |
3853 | } | |
3854 | ||
3855 | if (mdev->state.role == R_PRIMARY) { | |
3856 | if (fp >= FP_RESOURCE && mdev->state.pdsk >= D_UNKNOWN) { | |
3857 | enum drbd_disk_state nps = drbd_try_outdate_peer(mdev); | |
3858 | drbd_request_state(mdev, NS(pdsk, nps)); | |
3859 | } | |
3860 | } | |
3861 | ||
3862 | spin_lock_irq(&mdev->req_lock); | |
3863 | os = mdev->state; | |
3864 | if (os.conn >= C_UNCONNECTED) { | |
3865 | /* Do not restart in case we are C_DISCONNECTING */ | |
3866 | ns = os; | |
3867 | ns.conn = C_UNCONNECTED; | |
3868 | rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); | |
3869 | } | |
3870 | spin_unlock_irq(&mdev->req_lock); | |
3871 | ||
3872 | if (os.conn == C_DISCONNECTING) { | |
3873 | struct hlist_head *h; | |
3874 | wait_event(mdev->misc_wait, atomic_read(&mdev->net_cnt) == 0); | |
3875 | ||
3876 | /* we must not free the tl_hash | |
3877 | * while application io is still on the fly */ | |
3878 | wait_event(mdev->misc_wait, atomic_read(&mdev->ap_bio_cnt) == 0); | |
3879 | ||
3880 | spin_lock_irq(&mdev->req_lock); | |
3881 | /* paranoia code */ | |
3882 | for (h = mdev->ee_hash; h < mdev->ee_hash + mdev->ee_hash_s; h++) | |
3883 | if (h->first) | |
3884 | dev_err(DEV, "ASSERT FAILED ee_hash[%u].first == %p, expected NULL\n", | |
3885 | (int)(h - mdev->ee_hash), h->first); | |
3886 | kfree(mdev->ee_hash); | |
3887 | mdev->ee_hash = NULL; | |
3888 | mdev->ee_hash_s = 0; | |
3889 | ||
3890 | /* paranoia code */ | |
3891 | for (h = mdev->tl_hash; h < mdev->tl_hash + mdev->tl_hash_s; h++) | |
3892 | if (h->first) | |
3893 | dev_err(DEV, "ASSERT FAILED tl_hash[%u] == %p, expected NULL\n", | |
3894 | (int)(h - mdev->tl_hash), h->first); | |
3895 | kfree(mdev->tl_hash); | |
3896 | mdev->tl_hash = NULL; | |
3897 | mdev->tl_hash_s = 0; | |
3898 | spin_unlock_irq(&mdev->req_lock); | |
3899 | ||
3900 | crypto_free_hash(mdev->cram_hmac_tfm); | |
3901 | mdev->cram_hmac_tfm = NULL; | |
3902 | ||
3903 | kfree(mdev->net_conf); | |
3904 | mdev->net_conf = NULL; | |
3905 | drbd_request_state(mdev, NS(conn, C_STANDALONE)); | |
3906 | } | |
3907 | ||
3908 | /* tcp_close and release of sendpage pages can be deferred. I don't | |
3909 | * want to use SO_LINGER, because apparently it can be deferred for | |
3910 | * more than 20 seconds (longest time I checked). | |
3911 | * | |
3912 | * Actually we don't care for exactly when the network stack does its | |
3913 | * put_page(), but release our reference on these pages right here. | |
3914 | */ | |
3915 | i = drbd_release_ee(mdev, &mdev->net_ee); | |
3916 | if (i) | |
3917 | dev_info(DEV, "net_ee not empty, killed %u entries\n", i); | |
3918 | i = atomic_read(&mdev->pp_in_use); | |
3919 | if (i) | |
45bb912b | 3920 | dev_info(DEV, "pp_in_use = %d, expected 0\n", i); |
b411b363 PR |
3921 | |
3922 | D_ASSERT(list_empty(&mdev->read_ee)); | |
3923 | D_ASSERT(list_empty(&mdev->active_ee)); | |
3924 | D_ASSERT(list_empty(&mdev->sync_ee)); | |
3925 | D_ASSERT(list_empty(&mdev->done_ee)); | |
3926 | ||
3927 | /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ | |
3928 | atomic_set(&mdev->current_epoch->epoch_size, 0); | |
3929 | D_ASSERT(list_empty(&mdev->current_epoch->list)); | |
3930 | } | |
3931 | ||
3932 | /* | |
3933 | * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version | |
3934 | * we can agree on is stored in agreed_pro_version. | |
3935 | * | |
3936 | * feature flags and the reserved array should be enough room for future | |
3937 | * enhancements of the handshake protocol, and possible plugins... | |
3938 | * | |
3939 | * for now, they are expected to be zero, but ignored. | |
3940 | */ | |
3941 | static int drbd_send_handshake(struct drbd_conf *mdev) | |
3942 | { | |
3943 | /* ASSERT current == mdev->receiver ... */ | |
3944 | struct p_handshake *p = &mdev->data.sbuf.handshake; | |
3945 | int ok; | |
3946 | ||
3947 | if (mutex_lock_interruptible(&mdev->data.mutex)) { | |
3948 | dev_err(DEV, "interrupted during initial handshake\n"); | |
3949 | return 0; /* interrupted. not ok. */ | |
3950 | } | |
3951 | ||
3952 | if (mdev->data.socket == NULL) { | |
3953 | mutex_unlock(&mdev->data.mutex); | |
3954 | return 0; | |
3955 | } | |
3956 | ||
3957 | memset(p, 0, sizeof(*p)); | |
3958 | p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); | |
3959 | p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); | |
3960 | ok = _drbd_send_cmd( mdev, mdev->data.socket, P_HAND_SHAKE, | |
3961 | (struct p_header *)p, sizeof(*p), 0 ); | |
3962 | mutex_unlock(&mdev->data.mutex); | |
3963 | return ok; | |
3964 | } | |
3965 | ||
3966 | /* | |
3967 | * return values: | |
3968 | * 1 yes, we have a valid connection | |
3969 | * 0 oops, did not work out, please try again | |
3970 | * -1 peer talks different language, | |
3971 | * no point in trying again, please go standalone. | |
3972 | */ | |
3973 | static int drbd_do_handshake(struct drbd_conf *mdev) | |
3974 | { | |
3975 | /* ASSERT current == mdev->receiver ... */ | |
3976 | struct p_handshake *p = &mdev->data.rbuf.handshake; | |
3977 | const int expect = sizeof(struct p_handshake) | |
3978 | -sizeof(struct p_header); | |
3979 | int rv; | |
3980 | ||
3981 | rv = drbd_send_handshake(mdev); | |
3982 | if (!rv) | |
3983 | return 0; | |
3984 | ||
3985 | rv = drbd_recv_header(mdev, &p->head); | |
3986 | if (!rv) | |
3987 | return 0; | |
3988 | ||
3989 | if (p->head.command != P_HAND_SHAKE) { | |
3990 | dev_err(DEV, "expected HandShake packet, received: %s (0x%04x)\n", | |
3991 | cmdname(p->head.command), p->head.command); | |
3992 | return -1; | |
3993 | } | |
3994 | ||
3995 | if (p->head.length != expect) { | |
3996 | dev_err(DEV, "expected HandShake length: %u, received: %u\n", | |
3997 | expect, p->head.length); | |
3998 | return -1; | |
3999 | } | |
4000 | ||
4001 | rv = drbd_recv(mdev, &p->head.payload, expect); | |
4002 | ||
4003 | if (rv != expect) { | |
4004 | dev_err(DEV, "short read receiving handshake packet: l=%u\n", rv); | |
4005 | return 0; | |
4006 | } | |
4007 | ||
b411b363 PR |
4008 | p->protocol_min = be32_to_cpu(p->protocol_min); |
4009 | p->protocol_max = be32_to_cpu(p->protocol_max); | |
4010 | if (p->protocol_max == 0) | |
4011 | p->protocol_max = p->protocol_min; | |
4012 | ||
4013 | if (PRO_VERSION_MAX < p->protocol_min || | |
4014 | PRO_VERSION_MIN > p->protocol_max) | |
4015 | goto incompat; | |
4016 | ||
4017 | mdev->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); | |
4018 | ||
4019 | dev_info(DEV, "Handshake successful: " | |
4020 | "Agreed network protocol version %d\n", mdev->agreed_pro_version); | |
4021 | ||
4022 | return 1; | |
4023 | ||
4024 | incompat: | |
4025 | dev_err(DEV, "incompatible DRBD dialects: " | |
4026 | "I support %d-%d, peer supports %d-%d\n", | |
4027 | PRO_VERSION_MIN, PRO_VERSION_MAX, | |
4028 | p->protocol_min, p->protocol_max); | |
4029 | return -1; | |
4030 | } | |
4031 | ||
4032 | #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) | |
4033 | static int drbd_do_auth(struct drbd_conf *mdev) | |
4034 | { | |
4035 | dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); | |
4036 | dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); | |
b10d96cb | 4037 | return -1; |
b411b363 PR |
4038 | } |
4039 | #else | |
4040 | #define CHALLENGE_LEN 64 | |
b10d96cb JT |
4041 | |
4042 | /* Return value: | |
4043 | 1 - auth succeeded, | |
4044 | 0 - failed, try again (network error), | |
4045 | -1 - auth failed, don't try again. | |
4046 | */ | |
4047 | ||
b411b363 PR |
4048 | static int drbd_do_auth(struct drbd_conf *mdev) |
4049 | { | |
4050 | char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ | |
4051 | struct scatterlist sg; | |
4052 | char *response = NULL; | |
4053 | char *right_response = NULL; | |
4054 | char *peers_ch = NULL; | |
4055 | struct p_header p; | |
4056 | unsigned int key_len = strlen(mdev->net_conf->shared_secret); | |
4057 | unsigned int resp_size; | |
4058 | struct hash_desc desc; | |
4059 | int rv; | |
4060 | ||
4061 | desc.tfm = mdev->cram_hmac_tfm; | |
4062 | desc.flags = 0; | |
4063 | ||
4064 | rv = crypto_hash_setkey(mdev->cram_hmac_tfm, | |
4065 | (u8 *)mdev->net_conf->shared_secret, key_len); | |
4066 | if (rv) { | |
4067 | dev_err(DEV, "crypto_hash_setkey() failed with %d\n", rv); | |
b10d96cb | 4068 | rv = -1; |
b411b363 PR |
4069 | goto fail; |
4070 | } | |
4071 | ||
4072 | get_random_bytes(my_challenge, CHALLENGE_LEN); | |
4073 | ||
4074 | rv = drbd_send_cmd2(mdev, P_AUTH_CHALLENGE, my_challenge, CHALLENGE_LEN); | |
4075 | if (!rv) | |
4076 | goto fail; | |
4077 | ||
4078 | rv = drbd_recv_header(mdev, &p); | |
4079 | if (!rv) | |
4080 | goto fail; | |
4081 | ||
4082 | if (p.command != P_AUTH_CHALLENGE) { | |
4083 | dev_err(DEV, "expected AuthChallenge packet, received: %s (0x%04x)\n", | |
4084 | cmdname(p.command), p.command); | |
4085 | rv = 0; | |
4086 | goto fail; | |
4087 | } | |
4088 | ||
4089 | if (p.length > CHALLENGE_LEN*2) { | |
4090 | dev_err(DEV, "expected AuthChallenge payload too big.\n"); | |
b10d96cb | 4091 | rv = -1; |
b411b363 PR |
4092 | goto fail; |
4093 | } | |
4094 | ||
4095 | peers_ch = kmalloc(p.length, GFP_NOIO); | |
4096 | if (peers_ch == NULL) { | |
4097 | dev_err(DEV, "kmalloc of peers_ch failed\n"); | |
b10d96cb | 4098 | rv = -1; |
b411b363 PR |
4099 | goto fail; |
4100 | } | |
4101 | ||
4102 | rv = drbd_recv(mdev, peers_ch, p.length); | |
4103 | ||
4104 | if (rv != p.length) { | |
4105 | dev_err(DEV, "short read AuthChallenge: l=%u\n", rv); | |
4106 | rv = 0; | |
4107 | goto fail; | |
4108 | } | |
4109 | ||
4110 | resp_size = crypto_hash_digestsize(mdev->cram_hmac_tfm); | |
4111 | response = kmalloc(resp_size, GFP_NOIO); | |
4112 | if (response == NULL) { | |
4113 | dev_err(DEV, "kmalloc of response failed\n"); | |
b10d96cb | 4114 | rv = -1; |
b411b363 PR |
4115 | goto fail; |
4116 | } | |
4117 | ||
4118 | sg_init_table(&sg, 1); | |
4119 | sg_set_buf(&sg, peers_ch, p.length); | |
4120 | ||
4121 | rv = crypto_hash_digest(&desc, &sg, sg.length, response); | |
4122 | if (rv) { | |
4123 | dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv); | |
b10d96cb | 4124 | rv = -1; |
b411b363 PR |
4125 | goto fail; |
4126 | } | |
4127 | ||
4128 | rv = drbd_send_cmd2(mdev, P_AUTH_RESPONSE, response, resp_size); | |
4129 | if (!rv) | |
4130 | goto fail; | |
4131 | ||
4132 | rv = drbd_recv_header(mdev, &p); | |
4133 | if (!rv) | |
4134 | goto fail; | |
4135 | ||
4136 | if (p.command != P_AUTH_RESPONSE) { | |
4137 | dev_err(DEV, "expected AuthResponse packet, received: %s (0x%04x)\n", | |
4138 | cmdname(p.command), p.command); | |
4139 | rv = 0; | |
4140 | goto fail; | |
4141 | } | |
4142 | ||
4143 | if (p.length != resp_size) { | |
4144 | dev_err(DEV, "expected AuthResponse payload of wrong size\n"); | |
4145 | rv = 0; | |
4146 | goto fail; | |
4147 | } | |
4148 | ||
4149 | rv = drbd_recv(mdev, response , resp_size); | |
4150 | ||
4151 | if (rv != resp_size) { | |
4152 | dev_err(DEV, "short read receiving AuthResponse: l=%u\n", rv); | |
4153 | rv = 0; | |
4154 | goto fail; | |
4155 | } | |
4156 | ||
4157 | right_response = kmalloc(resp_size, GFP_NOIO); | |
2d1ee87d | 4158 | if (right_response == NULL) { |
b411b363 | 4159 | dev_err(DEV, "kmalloc of right_response failed\n"); |
b10d96cb | 4160 | rv = -1; |
b411b363 PR |
4161 | goto fail; |
4162 | } | |
4163 | ||
4164 | sg_set_buf(&sg, my_challenge, CHALLENGE_LEN); | |
4165 | ||
4166 | rv = crypto_hash_digest(&desc, &sg, sg.length, right_response); | |
4167 | if (rv) { | |
4168 | dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv); | |
b10d96cb | 4169 | rv = -1; |
b411b363 PR |
4170 | goto fail; |
4171 | } | |
4172 | ||
4173 | rv = !memcmp(response, right_response, resp_size); | |
4174 | ||
4175 | if (rv) | |
4176 | dev_info(DEV, "Peer authenticated using %d bytes of '%s' HMAC\n", | |
4177 | resp_size, mdev->net_conf->cram_hmac_alg); | |
b10d96cb JT |
4178 | else |
4179 | rv = -1; | |
b411b363 PR |
4180 | |
4181 | fail: | |
4182 | kfree(peers_ch); | |
4183 | kfree(response); | |
4184 | kfree(right_response); | |
4185 | ||
4186 | return rv; | |
4187 | } | |
4188 | #endif | |
4189 | ||
4190 | int drbdd_init(struct drbd_thread *thi) | |
4191 | { | |
4192 | struct drbd_conf *mdev = thi->mdev; | |
4193 | unsigned int minor = mdev_to_minor(mdev); | |
4194 | int h; | |
4195 | ||
4196 | sprintf(current->comm, "drbd%d_receiver", minor); | |
4197 | ||
4198 | dev_info(DEV, "receiver (re)started\n"); | |
4199 | ||
4200 | do { | |
4201 | h = drbd_connect(mdev); | |
4202 | if (h == 0) { | |
4203 | drbd_disconnect(mdev); | |
4204 | __set_current_state(TASK_INTERRUPTIBLE); | |
4205 | schedule_timeout(HZ); | |
4206 | } | |
4207 | if (h == -1) { | |
4208 | dev_warn(DEV, "Discarding network configuration.\n"); | |
4209 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
4210 | } | |
4211 | } while (h == 0); | |
4212 | ||
4213 | if (h > 0) { | |
4214 | if (get_net_conf(mdev)) { | |
4215 | drbdd(mdev); | |
4216 | put_net_conf(mdev); | |
4217 | } | |
4218 | } | |
4219 | ||
4220 | drbd_disconnect(mdev); | |
4221 | ||
4222 | dev_info(DEV, "receiver terminated\n"); | |
4223 | return 0; | |
4224 | } | |
4225 | ||
4226 | /* ********* acknowledge sender ******** */ | |
4227 | ||
4228 | static int got_RqSReply(struct drbd_conf *mdev, struct p_header *h) | |
4229 | { | |
4230 | struct p_req_state_reply *p = (struct p_req_state_reply *)h; | |
4231 | ||
4232 | int retcode = be32_to_cpu(p->retcode); | |
4233 | ||
4234 | if (retcode >= SS_SUCCESS) { | |
4235 | set_bit(CL_ST_CHG_SUCCESS, &mdev->flags); | |
4236 | } else { | |
4237 | set_bit(CL_ST_CHG_FAIL, &mdev->flags); | |
4238 | dev_err(DEV, "Requested state change failed by peer: %s (%d)\n", | |
4239 | drbd_set_st_err_str(retcode), retcode); | |
4240 | } | |
4241 | wake_up(&mdev->state_wait); | |
4242 | ||
4243 | return TRUE; | |
4244 | } | |
4245 | ||
4246 | static int got_Ping(struct drbd_conf *mdev, struct p_header *h) | |
4247 | { | |
4248 | return drbd_send_ping_ack(mdev); | |
4249 | ||
4250 | } | |
4251 | ||
4252 | static int got_PingAck(struct drbd_conf *mdev, struct p_header *h) | |
4253 | { | |
4254 | /* restore idle timeout */ | |
4255 | mdev->meta.socket->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ; | |
309d1608 PR |
4256 | if (!test_and_set_bit(GOT_PING_ACK, &mdev->flags)) |
4257 | wake_up(&mdev->misc_wait); | |
b411b363 PR |
4258 | |
4259 | return TRUE; | |
4260 | } | |
4261 | ||
4262 | static int got_IsInSync(struct drbd_conf *mdev, struct p_header *h) | |
4263 | { | |
4264 | struct p_block_ack *p = (struct p_block_ack *)h; | |
4265 | sector_t sector = be64_to_cpu(p->sector); | |
4266 | int blksize = be32_to_cpu(p->blksize); | |
4267 | ||
4268 | D_ASSERT(mdev->agreed_pro_version >= 89); | |
4269 | ||
4270 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
4271 | ||
4272 | drbd_rs_complete_io(mdev, sector); | |
4273 | drbd_set_in_sync(mdev, sector, blksize); | |
4274 | /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ | |
4275 | mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); | |
4276 | dec_rs_pending(mdev); | |
4277 | ||
4278 | return TRUE; | |
4279 | } | |
4280 | ||
4281 | /* when we receive the ACK for a write request, | |
4282 | * verify that we actually know about it */ | |
4283 | static struct drbd_request *_ack_id_to_req(struct drbd_conf *mdev, | |
4284 | u64 id, sector_t sector) | |
4285 | { | |
4286 | struct hlist_head *slot = tl_hash_slot(mdev, sector); | |
4287 | struct hlist_node *n; | |
4288 | struct drbd_request *req; | |
4289 | ||
4290 | hlist_for_each_entry(req, n, slot, colision) { | |
4291 | if ((unsigned long)req == (unsigned long)id) { | |
4292 | if (req->sector != sector) { | |
4293 | dev_err(DEV, "_ack_id_to_req: found req %p but it has " | |
4294 | "wrong sector (%llus versus %llus)\n", req, | |
4295 | (unsigned long long)req->sector, | |
4296 | (unsigned long long)sector); | |
4297 | break; | |
4298 | } | |
4299 | return req; | |
4300 | } | |
4301 | } | |
4302 | dev_err(DEV, "_ack_id_to_req: failed to find req %p, sector %llus in list\n", | |
4303 | (void *)(unsigned long)id, (unsigned long long)sector); | |
4304 | return NULL; | |
4305 | } | |
4306 | ||
4307 | typedef struct drbd_request *(req_validator_fn) | |
4308 | (struct drbd_conf *mdev, u64 id, sector_t sector); | |
4309 | ||
4310 | static int validate_req_change_req_state(struct drbd_conf *mdev, | |
4311 | u64 id, sector_t sector, req_validator_fn validator, | |
4312 | const char *func, enum drbd_req_event what) | |
4313 | { | |
4314 | struct drbd_request *req; | |
4315 | struct bio_and_error m; | |
4316 | ||
4317 | spin_lock_irq(&mdev->req_lock); | |
4318 | req = validator(mdev, id, sector); | |
4319 | if (unlikely(!req)) { | |
4320 | spin_unlock_irq(&mdev->req_lock); | |
4321 | dev_err(DEV, "%s: got a corrupt block_id/sector pair\n", func); | |
4322 | return FALSE; | |
4323 | } | |
4324 | __req_mod(req, what, &m); | |
4325 | spin_unlock_irq(&mdev->req_lock); | |
4326 | ||
4327 | if (m.bio) | |
4328 | complete_master_bio(mdev, &m); | |
4329 | return TRUE; | |
4330 | } | |
4331 | ||
4332 | static int got_BlockAck(struct drbd_conf *mdev, struct p_header *h) | |
4333 | { | |
4334 | struct p_block_ack *p = (struct p_block_ack *)h; | |
4335 | sector_t sector = be64_to_cpu(p->sector); | |
4336 | int blksize = be32_to_cpu(p->blksize); | |
4337 | enum drbd_req_event what; | |
4338 | ||
4339 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
4340 | ||
4341 | if (is_syncer_block_id(p->block_id)) { | |
4342 | drbd_set_in_sync(mdev, sector, blksize); | |
4343 | dec_rs_pending(mdev); | |
4344 | return TRUE; | |
4345 | } | |
4346 | switch (be16_to_cpu(h->command)) { | |
4347 | case P_RS_WRITE_ACK: | |
4348 | D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); | |
4349 | what = write_acked_by_peer_and_sis; | |
4350 | break; | |
4351 | case P_WRITE_ACK: | |
4352 | D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); | |
4353 | what = write_acked_by_peer; | |
4354 | break; | |
4355 | case P_RECV_ACK: | |
4356 | D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_B); | |
4357 | what = recv_acked_by_peer; | |
4358 | break; | |
4359 | case P_DISCARD_ACK: | |
4360 | D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C); | |
4361 | what = conflict_discarded_by_peer; | |
4362 | break; | |
4363 | default: | |
4364 | D_ASSERT(0); | |
4365 | return FALSE; | |
4366 | } | |
4367 | ||
4368 | return validate_req_change_req_state(mdev, p->block_id, sector, | |
4369 | _ack_id_to_req, __func__ , what); | |
4370 | } | |
4371 | ||
4372 | static int got_NegAck(struct drbd_conf *mdev, struct p_header *h) | |
4373 | { | |
4374 | struct p_block_ack *p = (struct p_block_ack *)h; | |
4375 | sector_t sector = be64_to_cpu(p->sector); | |
4376 | ||
4377 | if (__ratelimit(&drbd_ratelimit_state)) | |
4378 | dev_warn(DEV, "Got NegAck packet. Peer is in troubles?\n"); | |
4379 | ||
4380 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
4381 | ||
4382 | if (is_syncer_block_id(p->block_id)) { | |
4383 | int size = be32_to_cpu(p->blksize); | |
4384 | dec_rs_pending(mdev); | |
4385 | drbd_rs_failed_io(mdev, sector, size); | |
4386 | return TRUE; | |
4387 | } | |
4388 | return validate_req_change_req_state(mdev, p->block_id, sector, | |
4389 | _ack_id_to_req, __func__ , neg_acked); | |
4390 | } | |
4391 | ||
4392 | static int got_NegDReply(struct drbd_conf *mdev, struct p_header *h) | |
4393 | { | |
4394 | struct p_block_ack *p = (struct p_block_ack *)h; | |
4395 | sector_t sector = be64_to_cpu(p->sector); | |
4396 | ||
4397 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
4398 | dev_err(DEV, "Got NegDReply; Sector %llus, len %u; Fail original request.\n", | |
4399 | (unsigned long long)sector, be32_to_cpu(p->blksize)); | |
4400 | ||
4401 | return validate_req_change_req_state(mdev, p->block_id, sector, | |
4402 | _ar_id_to_req, __func__ , neg_acked); | |
4403 | } | |
4404 | ||
4405 | static int got_NegRSDReply(struct drbd_conf *mdev, struct p_header *h) | |
4406 | { | |
4407 | sector_t sector; | |
4408 | int size; | |
4409 | struct p_block_ack *p = (struct p_block_ack *)h; | |
4410 | ||
4411 | sector = be64_to_cpu(p->sector); | |
4412 | size = be32_to_cpu(p->blksize); | |
b411b363 PR |
4413 | |
4414 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
4415 | ||
4416 | dec_rs_pending(mdev); | |
4417 | ||
4418 | if (get_ldev_if_state(mdev, D_FAILED)) { | |
4419 | drbd_rs_complete_io(mdev, sector); | |
4420 | drbd_rs_failed_io(mdev, sector, size); | |
4421 | put_ldev(mdev); | |
4422 | } | |
4423 | ||
4424 | return TRUE; | |
4425 | } | |
4426 | ||
4427 | static int got_BarrierAck(struct drbd_conf *mdev, struct p_header *h) | |
4428 | { | |
4429 | struct p_barrier_ack *p = (struct p_barrier_ack *)h; | |
4430 | ||
4431 | tl_release(mdev, p->barrier, be32_to_cpu(p->set_size)); | |
4432 | ||
4433 | return TRUE; | |
4434 | } | |
4435 | ||
4436 | static int got_OVResult(struct drbd_conf *mdev, struct p_header *h) | |
4437 | { | |
4438 | struct p_block_ack *p = (struct p_block_ack *)h; | |
4439 | struct drbd_work *w; | |
4440 | sector_t sector; | |
4441 | int size; | |
4442 | ||
4443 | sector = be64_to_cpu(p->sector); | |
4444 | size = be32_to_cpu(p->blksize); | |
4445 | ||
4446 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
4447 | ||
4448 | if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) | |
4449 | drbd_ov_oos_found(mdev, sector, size); | |
4450 | else | |
4451 | ov_oos_print(mdev); | |
4452 | ||
4453 | drbd_rs_complete_io(mdev, sector); | |
4454 | dec_rs_pending(mdev); | |
4455 | ||
4456 | if (--mdev->ov_left == 0) { | |
4457 | w = kmalloc(sizeof(*w), GFP_NOIO); | |
4458 | if (w) { | |
4459 | w->cb = w_ov_finished; | |
4460 | drbd_queue_work_front(&mdev->data.work, w); | |
4461 | } else { | |
4462 | dev_err(DEV, "kmalloc(w) failed."); | |
4463 | ov_oos_print(mdev); | |
4464 | drbd_resync_finished(mdev); | |
4465 | } | |
4466 | } | |
4467 | return TRUE; | |
4468 | } | |
4469 | ||
0ced55a3 PR |
4470 | static int got_delay_probe_m(struct drbd_conf *mdev, struct p_header *h) |
4471 | { | |
4472 | struct p_delay_probe *p = (struct p_delay_probe *)h; | |
4473 | ||
4474 | got_delay_probe(mdev, USE_META_SOCKET, p); | |
4475 | return TRUE; | |
4476 | } | |
4477 | ||
b411b363 PR |
4478 | struct asender_cmd { |
4479 | size_t pkt_size; | |
4480 | int (*process)(struct drbd_conf *mdev, struct p_header *h); | |
4481 | }; | |
4482 | ||
4483 | static struct asender_cmd *get_asender_cmd(int cmd) | |
4484 | { | |
4485 | static struct asender_cmd asender_tbl[] = { | |
4486 | /* anything missing from this table is in | |
4487 | * the drbd_cmd_handler (drbd_default_handler) table, | |
4488 | * see the beginning of drbdd() */ | |
4489 | [P_PING] = { sizeof(struct p_header), got_Ping }, | |
4490 | [P_PING_ACK] = { sizeof(struct p_header), got_PingAck }, | |
4491 | [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, | |
4492 | [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, | |
4493 | [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, | |
4494 | [P_DISCARD_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, | |
4495 | [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, | |
4496 | [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, | |
4497 | [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply}, | |
4498 | [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, | |
4499 | [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, | |
4500 | [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, | |
4501 | [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, | |
0ced55a3 | 4502 | [P_DELAY_PROBE] = { sizeof(struct p_delay_probe), got_delay_probe_m }, |
b411b363 PR |
4503 | [P_MAX_CMD] = { 0, NULL }, |
4504 | }; | |
4505 | if (cmd > P_MAX_CMD || asender_tbl[cmd].process == NULL) | |
4506 | return NULL; | |
4507 | return &asender_tbl[cmd]; | |
4508 | } | |
4509 | ||
4510 | int drbd_asender(struct drbd_thread *thi) | |
4511 | { | |
4512 | struct drbd_conf *mdev = thi->mdev; | |
4513 | struct p_header *h = &mdev->meta.rbuf.header; | |
4514 | struct asender_cmd *cmd = NULL; | |
4515 | ||
4516 | int rv, len; | |
4517 | void *buf = h; | |
4518 | int received = 0; | |
4519 | int expect = sizeof(struct p_header); | |
4520 | int empty; | |
4521 | ||
4522 | sprintf(current->comm, "drbd%d_asender", mdev_to_minor(mdev)); | |
4523 | ||
4524 | current->policy = SCHED_RR; /* Make this a realtime task! */ | |
4525 | current->rt_priority = 2; /* more important than all other tasks */ | |
4526 | ||
4527 | while (get_t_state(thi) == Running) { | |
4528 | drbd_thread_current_set_cpu(mdev); | |
4529 | if (test_and_clear_bit(SEND_PING, &mdev->flags)) { | |
4530 | ERR_IF(!drbd_send_ping(mdev)) goto reconnect; | |
4531 | mdev->meta.socket->sk->sk_rcvtimeo = | |
4532 | mdev->net_conf->ping_timeo*HZ/10; | |
4533 | } | |
4534 | ||
4535 | /* conditionally cork; | |
4536 | * it may hurt latency if we cork without much to send */ | |
4537 | if (!mdev->net_conf->no_cork && | |
4538 | 3 < atomic_read(&mdev->unacked_cnt)) | |
4539 | drbd_tcp_cork(mdev->meta.socket); | |
4540 | while (1) { | |
4541 | clear_bit(SIGNAL_ASENDER, &mdev->flags); | |
4542 | flush_signals(current); | |
4543 | if (!drbd_process_done_ee(mdev)) { | |
4544 | dev_err(DEV, "process_done_ee() = NOT_OK\n"); | |
4545 | goto reconnect; | |
4546 | } | |
4547 | /* to avoid race with newly queued ACKs */ | |
4548 | set_bit(SIGNAL_ASENDER, &mdev->flags); | |
4549 | spin_lock_irq(&mdev->req_lock); | |
4550 | empty = list_empty(&mdev->done_ee); | |
4551 | spin_unlock_irq(&mdev->req_lock); | |
4552 | /* new ack may have been queued right here, | |
4553 | * but then there is also a signal pending, | |
4554 | * and we start over... */ | |
4555 | if (empty) | |
4556 | break; | |
4557 | } | |
4558 | /* but unconditionally uncork unless disabled */ | |
4559 | if (!mdev->net_conf->no_cork) | |
4560 | drbd_tcp_uncork(mdev->meta.socket); | |
4561 | ||
4562 | /* short circuit, recv_msg would return EINTR anyways. */ | |
4563 | if (signal_pending(current)) | |
4564 | continue; | |
4565 | ||
4566 | rv = drbd_recv_short(mdev, mdev->meta.socket, | |
4567 | buf, expect-received, 0); | |
4568 | clear_bit(SIGNAL_ASENDER, &mdev->flags); | |
4569 | ||
4570 | flush_signals(current); | |
4571 | ||
4572 | /* Note: | |
4573 | * -EINTR (on meta) we got a signal | |
4574 | * -EAGAIN (on meta) rcvtimeo expired | |
4575 | * -ECONNRESET other side closed the connection | |
4576 | * -ERESTARTSYS (on data) we got a signal | |
4577 | * rv < 0 other than above: unexpected error! | |
4578 | * rv == expected: full header or command | |
4579 | * rv < expected: "woken" by signal during receive | |
4580 | * rv == 0 : "connection shut down by peer" | |
4581 | */ | |
4582 | if (likely(rv > 0)) { | |
4583 | received += rv; | |
4584 | buf += rv; | |
4585 | } else if (rv == 0) { | |
4586 | dev_err(DEV, "meta connection shut down by peer.\n"); | |
4587 | goto reconnect; | |
4588 | } else if (rv == -EAGAIN) { | |
4589 | if (mdev->meta.socket->sk->sk_rcvtimeo == | |
4590 | mdev->net_conf->ping_timeo*HZ/10) { | |
4591 | dev_err(DEV, "PingAck did not arrive in time.\n"); | |
4592 | goto reconnect; | |
4593 | } | |
4594 | set_bit(SEND_PING, &mdev->flags); | |
4595 | continue; | |
4596 | } else if (rv == -EINTR) { | |
4597 | continue; | |
4598 | } else { | |
4599 | dev_err(DEV, "sock_recvmsg returned %d\n", rv); | |
4600 | goto reconnect; | |
4601 | } | |
4602 | ||
4603 | if (received == expect && cmd == NULL) { | |
4604 | if (unlikely(h->magic != BE_DRBD_MAGIC)) { | |
4605 | dev_err(DEV, "magic?? on meta m: 0x%lx c: %d l: %d\n", | |
4606 | (long)be32_to_cpu(h->magic), | |
4607 | h->command, h->length); | |
4608 | goto reconnect; | |
4609 | } | |
4610 | cmd = get_asender_cmd(be16_to_cpu(h->command)); | |
4611 | len = be16_to_cpu(h->length); | |
4612 | if (unlikely(cmd == NULL)) { | |
4613 | dev_err(DEV, "unknown command?? on meta m: 0x%lx c: %d l: %d\n", | |
4614 | (long)be32_to_cpu(h->magic), | |
4615 | h->command, h->length); | |
4616 | goto disconnect; | |
4617 | } | |
4618 | expect = cmd->pkt_size; | |
6a0afdf5 | 4619 | ERR_IF(len != expect-sizeof(struct p_header)) |
b411b363 | 4620 | goto reconnect; |
b411b363 PR |
4621 | } |
4622 | if (received == expect) { | |
4623 | D_ASSERT(cmd != NULL); | |
b411b363 PR |
4624 | if (!cmd->process(mdev, h)) |
4625 | goto reconnect; | |
4626 | ||
4627 | buf = h; | |
4628 | received = 0; | |
4629 | expect = sizeof(struct p_header); | |
4630 | cmd = NULL; | |
4631 | } | |
4632 | } | |
4633 | ||
4634 | if (0) { | |
4635 | reconnect: | |
4636 | drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE)); | |
4637 | } | |
4638 | if (0) { | |
4639 | disconnect: | |
4640 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
4641 | } | |
4642 | clear_bit(SIGNAL_ASENDER, &mdev->flags); | |
4643 | ||
4644 | D_ASSERT(mdev->state.conn < C_CONNECTED); | |
4645 | dev_info(DEV, "asender terminated\n"); | |
4646 | ||
4647 | return 0; | |
4648 | } |