Commit | Line | Data |
---|---|---|
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> | |
b411b363 PR |
39 | #include <linux/pkt_sched.h> |
40 | #define __KERNEL_SYSCALLS__ | |
41 | #include <linux/unistd.h> | |
42 | #include <linux/vmalloc.h> | |
43 | #include <linux/random.h> | |
b411b363 PR |
44 | #include <linux/string.h> |
45 | #include <linux/scatterlist.h> | |
46 | #include "drbd_int.h" | |
b411b363 PR |
47 | #include "drbd_req.h" |
48 | ||
49 | #include "drbd_vli.h" | |
50 | ||
77351055 PR |
51 | struct packet_info { |
52 | enum drbd_packet cmd; | |
e2857216 AG |
53 | unsigned int size; |
54 | unsigned int vnr; | |
e658983a | 55 | void *data; |
77351055 PR |
56 | }; |
57 | ||
b411b363 PR |
58 | enum finish_epoch { |
59 | FE_STILL_LIVE, | |
60 | FE_DESTROYED, | |
61 | FE_RECYCLED, | |
62 | }; | |
63 | ||
6038178e | 64 | static int drbd_do_features(struct drbd_tconn *tconn); |
13e6037d | 65 | static int drbd_do_auth(struct drbd_tconn *tconn); |
360cc740 | 66 | static int drbd_disconnected(int vnr, void *p, void *data); |
b411b363 PR |
67 | |
68 | static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *, struct drbd_epoch *, enum epoch_event); | |
99920dc5 | 69 | static int e_end_block(struct drbd_work *, int); |
b411b363 | 70 | |
b411b363 PR |
71 | |
72 | #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) | |
73 | ||
45bb912b LE |
74 | /* |
75 | * some helper functions to deal with single linked page lists, | |
76 | * page->private being our "next" pointer. | |
77 | */ | |
78 | ||
79 | /* If at least n pages are linked at head, get n pages off. | |
80 | * Otherwise, don't modify head, and return NULL. | |
81 | * Locking is the responsibility of the caller. | |
82 | */ | |
83 | static struct page *page_chain_del(struct page **head, int n) | |
84 | { | |
85 | struct page *page; | |
86 | struct page *tmp; | |
87 | ||
88 | BUG_ON(!n); | |
89 | BUG_ON(!head); | |
90 | ||
91 | page = *head; | |
23ce4227 PR |
92 | |
93 | if (!page) | |
94 | return NULL; | |
95 | ||
45bb912b LE |
96 | while (page) { |
97 | tmp = page_chain_next(page); | |
98 | if (--n == 0) | |
99 | break; /* found sufficient pages */ | |
100 | if (tmp == NULL) | |
101 | /* insufficient pages, don't use any of them. */ | |
102 | return NULL; | |
103 | page = tmp; | |
104 | } | |
105 | ||
106 | /* add end of list marker for the returned list */ | |
107 | set_page_private(page, 0); | |
108 | /* actual return value, and adjustment of head */ | |
109 | page = *head; | |
110 | *head = tmp; | |
111 | return page; | |
112 | } | |
113 | ||
114 | /* may be used outside of locks to find the tail of a (usually short) | |
115 | * "private" page chain, before adding it back to a global chain head | |
116 | * with page_chain_add() under a spinlock. */ | |
117 | static struct page *page_chain_tail(struct page *page, int *len) | |
118 | { | |
119 | struct page *tmp; | |
120 | int i = 1; | |
121 | while ((tmp = page_chain_next(page))) | |
122 | ++i, page = tmp; | |
123 | if (len) | |
124 | *len = i; | |
125 | return page; | |
126 | } | |
127 | ||
128 | static int page_chain_free(struct page *page) | |
129 | { | |
130 | struct page *tmp; | |
131 | int i = 0; | |
132 | page_chain_for_each_safe(page, tmp) { | |
133 | put_page(page); | |
134 | ++i; | |
135 | } | |
136 | return i; | |
137 | } | |
138 | ||
139 | static void page_chain_add(struct page **head, | |
140 | struct page *chain_first, struct page *chain_last) | |
141 | { | |
142 | #if 1 | |
143 | struct page *tmp; | |
144 | tmp = page_chain_tail(chain_first, NULL); | |
145 | BUG_ON(tmp != chain_last); | |
146 | #endif | |
147 | ||
148 | /* add chain to head */ | |
149 | set_page_private(chain_last, (unsigned long)*head); | |
150 | *head = chain_first; | |
151 | } | |
152 | ||
153 | static struct page *drbd_pp_first_pages_or_try_alloc(struct drbd_conf *mdev, int number) | |
b411b363 PR |
154 | { |
155 | struct page *page = NULL; | |
45bb912b LE |
156 | struct page *tmp = NULL; |
157 | int i = 0; | |
b411b363 PR |
158 | |
159 | /* Yes, testing drbd_pp_vacant outside the lock is racy. | |
160 | * So what. It saves a spin_lock. */ | |
45bb912b | 161 | if (drbd_pp_vacant >= number) { |
b411b363 | 162 | spin_lock(&drbd_pp_lock); |
45bb912b LE |
163 | page = page_chain_del(&drbd_pp_pool, number); |
164 | if (page) | |
165 | drbd_pp_vacant -= number; | |
b411b363 | 166 | spin_unlock(&drbd_pp_lock); |
45bb912b LE |
167 | if (page) |
168 | return page; | |
b411b363 | 169 | } |
45bb912b | 170 | |
b411b363 PR |
171 | /* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD |
172 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
173 | * which in turn might block on the other node at this very place. */ | |
45bb912b LE |
174 | for (i = 0; i < number; i++) { |
175 | tmp = alloc_page(GFP_TRY); | |
176 | if (!tmp) | |
177 | break; | |
178 | set_page_private(tmp, (unsigned long)page); | |
179 | page = tmp; | |
180 | } | |
181 | ||
182 | if (i == number) | |
183 | return page; | |
184 | ||
185 | /* Not enough pages immediately available this time. | |
186 | * No need to jump around here, drbd_pp_alloc will retry this | |
187 | * function "soon". */ | |
188 | if (page) { | |
189 | tmp = page_chain_tail(page, NULL); | |
190 | spin_lock(&drbd_pp_lock); | |
191 | page_chain_add(&drbd_pp_pool, page, tmp); | |
192 | drbd_pp_vacant += i; | |
193 | spin_unlock(&drbd_pp_lock); | |
194 | } | |
195 | return NULL; | |
b411b363 PR |
196 | } |
197 | ||
a990be46 AG |
198 | static void reclaim_finished_net_peer_reqs(struct drbd_conf *mdev, |
199 | struct list_head *to_be_freed) | |
b411b363 | 200 | { |
db830c46 | 201 | struct drbd_peer_request *peer_req; |
b411b363 PR |
202 | struct list_head *le, *tle; |
203 | ||
204 | /* The EEs are always appended to the end of the list. Since | |
205 | they are sent in order over the wire, they have to finish | |
206 | in order. As soon as we see the first not finished we can | |
207 | stop to examine the list... */ | |
208 | ||
209 | list_for_each_safe(le, tle, &mdev->net_ee) { | |
db830c46 | 210 | peer_req = list_entry(le, struct drbd_peer_request, w.list); |
045417f7 | 211 | if (drbd_peer_req_has_active_page(peer_req)) |
b411b363 PR |
212 | break; |
213 | list_move(le, to_be_freed); | |
214 | } | |
215 | } | |
216 | ||
217 | static void drbd_kick_lo_and_reclaim_net(struct drbd_conf *mdev) | |
218 | { | |
219 | LIST_HEAD(reclaimed); | |
db830c46 | 220 | struct drbd_peer_request *peer_req, *t; |
b411b363 | 221 | |
87eeee41 | 222 | spin_lock_irq(&mdev->tconn->req_lock); |
a990be46 | 223 | reclaim_finished_net_peer_reqs(mdev, &reclaimed); |
87eeee41 | 224 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 225 | |
db830c46 | 226 | list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) |
3967deb1 | 227 | drbd_free_net_peer_req(mdev, peer_req); |
b411b363 PR |
228 | } |
229 | ||
230 | /** | |
45bb912b | 231 | * drbd_pp_alloc() - Returns @number pages, retries forever (or until signalled) |
b411b363 | 232 | * @mdev: DRBD device. |
45bb912b LE |
233 | * @number: number of pages requested |
234 | * @retry: whether to retry, if not enough pages are available right now | |
235 | * | |
236 | * Tries to allocate number pages, first from our own page pool, then from | |
237 | * the kernel, unless this allocation would exceed the max_buffers setting. | |
238 | * Possibly retry until DRBD frees sufficient pages somewhere else. | |
b411b363 | 239 | * |
45bb912b | 240 | * Returns a page chain linked via page->private. |
b411b363 | 241 | */ |
45bb912b | 242 | static struct page *drbd_pp_alloc(struct drbd_conf *mdev, unsigned number, bool retry) |
b411b363 PR |
243 | { |
244 | struct page *page = NULL; | |
245 | DEFINE_WAIT(wait); | |
246 | ||
45bb912b LE |
247 | /* Yes, we may run up to @number over max_buffers. If we |
248 | * follow it strictly, the admin will get it wrong anyways. */ | |
89e58e75 | 249 | if (atomic_read(&mdev->pp_in_use) < mdev->tconn->net_conf->max_buffers) |
45bb912b | 250 | page = drbd_pp_first_pages_or_try_alloc(mdev, number); |
b411b363 | 251 | |
45bb912b | 252 | while (page == NULL) { |
b411b363 PR |
253 | prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE); |
254 | ||
255 | drbd_kick_lo_and_reclaim_net(mdev); | |
256 | ||
89e58e75 | 257 | if (atomic_read(&mdev->pp_in_use) < mdev->tconn->net_conf->max_buffers) { |
45bb912b | 258 | page = drbd_pp_first_pages_or_try_alloc(mdev, number); |
b411b363 PR |
259 | if (page) |
260 | break; | |
261 | } | |
262 | ||
263 | if (!retry) | |
264 | break; | |
265 | ||
266 | if (signal_pending(current)) { | |
267 | dev_warn(DEV, "drbd_pp_alloc interrupted!\n"); | |
268 | break; | |
269 | } | |
270 | ||
271 | schedule(); | |
272 | } | |
273 | finish_wait(&drbd_pp_wait, &wait); | |
274 | ||
45bb912b LE |
275 | if (page) |
276 | atomic_add(number, &mdev->pp_in_use); | |
b411b363 PR |
277 | return page; |
278 | } | |
279 | ||
280 | /* Must not be used from irq, as that may deadlock: see drbd_pp_alloc. | |
87eeee41 | 281 | * Is also used from inside an other spin_lock_irq(&mdev->tconn->req_lock); |
45bb912b LE |
282 | * Either links the page chain back to the global pool, |
283 | * or returns all pages to the system. */ | |
435f0740 | 284 | static void drbd_pp_free(struct drbd_conf *mdev, struct page *page, int is_net) |
b411b363 | 285 | { |
435f0740 | 286 | atomic_t *a = is_net ? &mdev->pp_in_use_by_net : &mdev->pp_in_use; |
b411b363 | 287 | int i; |
435f0740 | 288 | |
81a5d60e | 289 | if (drbd_pp_vacant > (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * minor_count) |
45bb912b LE |
290 | i = page_chain_free(page); |
291 | else { | |
292 | struct page *tmp; | |
293 | tmp = page_chain_tail(page, &i); | |
294 | spin_lock(&drbd_pp_lock); | |
295 | page_chain_add(&drbd_pp_pool, page, tmp); | |
296 | drbd_pp_vacant += i; | |
297 | spin_unlock(&drbd_pp_lock); | |
b411b363 | 298 | } |
435f0740 | 299 | i = atomic_sub_return(i, a); |
45bb912b | 300 | if (i < 0) |
435f0740 LE |
301 | dev_warn(DEV, "ASSERTION FAILED: %s: %d < 0\n", |
302 | is_net ? "pp_in_use_by_net" : "pp_in_use", i); | |
b411b363 PR |
303 | wake_up(&drbd_pp_wait); |
304 | } | |
305 | ||
306 | /* | |
307 | You need to hold the req_lock: | |
308 | _drbd_wait_ee_list_empty() | |
309 | ||
310 | You must not have the req_lock: | |
3967deb1 | 311 | drbd_free_peer_req() |
0db55363 | 312 | drbd_alloc_peer_req() |
7721f567 | 313 | drbd_free_peer_reqs() |
b411b363 | 314 | drbd_ee_fix_bhs() |
a990be46 | 315 | drbd_finish_peer_reqs() |
b411b363 PR |
316 | drbd_clear_done_ee() |
317 | drbd_wait_ee_list_empty() | |
318 | */ | |
319 | ||
f6ffca9f | 320 | struct drbd_peer_request * |
0db55363 AG |
321 | drbd_alloc_peer_req(struct drbd_conf *mdev, u64 id, sector_t sector, |
322 | unsigned int data_size, gfp_t gfp_mask) __must_hold(local) | |
b411b363 | 323 | { |
db830c46 | 324 | struct drbd_peer_request *peer_req; |
b411b363 | 325 | struct page *page; |
45bb912b | 326 | unsigned nr_pages = (data_size + PAGE_SIZE -1) >> PAGE_SHIFT; |
b411b363 | 327 | |
0cf9d27e | 328 | if (drbd_insert_fault(mdev, DRBD_FAULT_AL_EE)) |
b411b363 PR |
329 | return NULL; |
330 | ||
db830c46 AG |
331 | peer_req = mempool_alloc(drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM); |
332 | if (!peer_req) { | |
b411b363 | 333 | if (!(gfp_mask & __GFP_NOWARN)) |
0db55363 | 334 | dev_err(DEV, "%s: allocation failed\n", __func__); |
b411b363 PR |
335 | return NULL; |
336 | } | |
337 | ||
45bb912b LE |
338 | page = drbd_pp_alloc(mdev, nr_pages, (gfp_mask & __GFP_WAIT)); |
339 | if (!page) | |
340 | goto fail; | |
b411b363 | 341 | |
db830c46 AG |
342 | drbd_clear_interval(&peer_req->i); |
343 | peer_req->i.size = data_size; | |
344 | peer_req->i.sector = sector; | |
345 | peer_req->i.local = false; | |
346 | peer_req->i.waiting = false; | |
347 | ||
348 | peer_req->epoch = NULL; | |
a21e9298 | 349 | peer_req->w.mdev = mdev; |
db830c46 AG |
350 | peer_req->pages = page; |
351 | atomic_set(&peer_req->pending_bios, 0); | |
352 | peer_req->flags = 0; | |
9a8e7753 AG |
353 | /* |
354 | * The block_id is opaque to the receiver. It is not endianness | |
355 | * converted, and sent back to the sender unchanged. | |
356 | */ | |
db830c46 | 357 | peer_req->block_id = id; |
b411b363 | 358 | |
db830c46 | 359 | return peer_req; |
b411b363 | 360 | |
45bb912b | 361 | fail: |
db830c46 | 362 | mempool_free(peer_req, drbd_ee_mempool); |
b411b363 PR |
363 | return NULL; |
364 | } | |
365 | ||
3967deb1 | 366 | void __drbd_free_peer_req(struct drbd_conf *mdev, struct drbd_peer_request *peer_req, |
f6ffca9f | 367 | int is_net) |
b411b363 | 368 | { |
db830c46 AG |
369 | if (peer_req->flags & EE_HAS_DIGEST) |
370 | kfree(peer_req->digest); | |
371 | drbd_pp_free(mdev, peer_req->pages, is_net); | |
372 | D_ASSERT(atomic_read(&peer_req->pending_bios) == 0); | |
373 | D_ASSERT(drbd_interval_empty(&peer_req->i)); | |
374 | mempool_free(peer_req, drbd_ee_mempool); | |
b411b363 PR |
375 | } |
376 | ||
7721f567 | 377 | int drbd_free_peer_reqs(struct drbd_conf *mdev, struct list_head *list) |
b411b363 PR |
378 | { |
379 | LIST_HEAD(work_list); | |
db830c46 | 380 | struct drbd_peer_request *peer_req, *t; |
b411b363 | 381 | int count = 0; |
435f0740 | 382 | int is_net = list == &mdev->net_ee; |
b411b363 | 383 | |
87eeee41 | 384 | spin_lock_irq(&mdev->tconn->req_lock); |
b411b363 | 385 | list_splice_init(list, &work_list); |
87eeee41 | 386 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 387 | |
db830c46 | 388 | list_for_each_entry_safe(peer_req, t, &work_list, w.list) { |
3967deb1 | 389 | __drbd_free_peer_req(mdev, peer_req, is_net); |
b411b363 PR |
390 | count++; |
391 | } | |
392 | return count; | |
393 | } | |
394 | ||
a990be46 AG |
395 | /* |
396 | * See also comments in _req_mod(,BARRIER_ACKED) and receive_Barrier. | |
b411b363 | 397 | */ |
a990be46 | 398 | static int drbd_finish_peer_reqs(struct drbd_conf *mdev) |
b411b363 PR |
399 | { |
400 | LIST_HEAD(work_list); | |
401 | LIST_HEAD(reclaimed); | |
db830c46 | 402 | struct drbd_peer_request *peer_req, *t; |
e2b3032b | 403 | int err = 0; |
b411b363 | 404 | |
87eeee41 | 405 | spin_lock_irq(&mdev->tconn->req_lock); |
a990be46 | 406 | reclaim_finished_net_peer_reqs(mdev, &reclaimed); |
b411b363 | 407 | list_splice_init(&mdev->done_ee, &work_list); |
87eeee41 | 408 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 409 | |
db830c46 | 410 | list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) |
3967deb1 | 411 | drbd_free_net_peer_req(mdev, peer_req); |
b411b363 PR |
412 | |
413 | /* possible callbacks here: | |
7be8da07 | 414 | * e_end_block, and e_end_resync_block, e_send_discard_write. |
b411b363 PR |
415 | * all ignore the last argument. |
416 | */ | |
db830c46 | 417 | list_for_each_entry_safe(peer_req, t, &work_list, w.list) { |
e2b3032b AG |
418 | int err2; |
419 | ||
b411b363 | 420 | /* list_del not necessary, next/prev members not touched */ |
e2b3032b AG |
421 | err2 = peer_req->w.cb(&peer_req->w, !!err); |
422 | if (!err) | |
423 | err = err2; | |
3967deb1 | 424 | drbd_free_peer_req(mdev, peer_req); |
b411b363 PR |
425 | } |
426 | wake_up(&mdev->ee_wait); | |
427 | ||
e2b3032b | 428 | return err; |
b411b363 PR |
429 | } |
430 | ||
d4da1537 AG |
431 | static void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, |
432 | struct list_head *head) | |
b411b363 PR |
433 | { |
434 | DEFINE_WAIT(wait); | |
435 | ||
436 | /* avoids spin_lock/unlock | |
437 | * and calling prepare_to_wait in the fast path */ | |
438 | while (!list_empty(head)) { | |
439 | prepare_to_wait(&mdev->ee_wait, &wait, TASK_UNINTERRUPTIBLE); | |
87eeee41 | 440 | spin_unlock_irq(&mdev->tconn->req_lock); |
7eaceacc | 441 | io_schedule(); |
b411b363 | 442 | finish_wait(&mdev->ee_wait, &wait); |
87eeee41 | 443 | spin_lock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
444 | } |
445 | } | |
446 | ||
d4da1537 AG |
447 | static void drbd_wait_ee_list_empty(struct drbd_conf *mdev, |
448 | struct list_head *head) | |
b411b363 | 449 | { |
87eeee41 | 450 | spin_lock_irq(&mdev->tconn->req_lock); |
b411b363 | 451 | _drbd_wait_ee_list_empty(mdev, head); |
87eeee41 | 452 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
453 | } |
454 | ||
455 | /* see also kernel_accept; which is only present since 2.6.18. | |
456 | * also we want to log which part of it failed, exactly */ | |
7653620d | 457 | static int drbd_accept(const char **what, struct socket *sock, struct socket **newsock) |
b411b363 PR |
458 | { |
459 | struct sock *sk = sock->sk; | |
460 | int err = 0; | |
461 | ||
462 | *what = "listen"; | |
463 | err = sock->ops->listen(sock, 5); | |
464 | if (err < 0) | |
465 | goto out; | |
466 | ||
467 | *what = "sock_create_lite"; | |
468 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, | |
469 | newsock); | |
470 | if (err < 0) | |
471 | goto out; | |
472 | ||
473 | *what = "accept"; | |
474 | err = sock->ops->accept(sock, *newsock, 0); | |
475 | if (err < 0) { | |
476 | sock_release(*newsock); | |
477 | *newsock = NULL; | |
478 | goto out; | |
479 | } | |
480 | (*newsock)->ops = sock->ops; | |
481 | ||
482 | out: | |
483 | return err; | |
484 | } | |
485 | ||
dbd9eea0 | 486 | static int drbd_recv_short(struct socket *sock, void *buf, size_t size, int flags) |
b411b363 PR |
487 | { |
488 | mm_segment_t oldfs; | |
489 | struct kvec iov = { | |
490 | .iov_base = buf, | |
491 | .iov_len = size, | |
492 | }; | |
493 | struct msghdr msg = { | |
494 | .msg_iovlen = 1, | |
495 | .msg_iov = (struct iovec *)&iov, | |
496 | .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) | |
497 | }; | |
498 | int rv; | |
499 | ||
500 | oldfs = get_fs(); | |
501 | set_fs(KERNEL_DS); | |
502 | rv = sock_recvmsg(sock, &msg, size, msg.msg_flags); | |
503 | set_fs(oldfs); | |
504 | ||
505 | return rv; | |
506 | } | |
507 | ||
de0ff338 | 508 | static int drbd_recv(struct drbd_tconn *tconn, void *buf, size_t size) |
b411b363 PR |
509 | { |
510 | mm_segment_t oldfs; | |
511 | struct kvec iov = { | |
512 | .iov_base = buf, | |
513 | .iov_len = size, | |
514 | }; | |
515 | struct msghdr msg = { | |
516 | .msg_iovlen = 1, | |
517 | .msg_iov = (struct iovec *)&iov, | |
518 | .msg_flags = MSG_WAITALL | MSG_NOSIGNAL | |
519 | }; | |
520 | int rv; | |
521 | ||
522 | oldfs = get_fs(); | |
523 | set_fs(KERNEL_DS); | |
524 | ||
525 | for (;;) { | |
de0ff338 | 526 | rv = sock_recvmsg(tconn->data.socket, &msg, size, msg.msg_flags); |
b411b363 PR |
527 | if (rv == size) |
528 | break; | |
529 | ||
530 | /* Note: | |
531 | * ECONNRESET other side closed the connection | |
532 | * ERESTARTSYS (on sock) we got a signal | |
533 | */ | |
534 | ||
535 | if (rv < 0) { | |
536 | if (rv == -ECONNRESET) | |
de0ff338 | 537 | conn_info(tconn, "sock was reset by peer\n"); |
b411b363 | 538 | else if (rv != -ERESTARTSYS) |
de0ff338 | 539 | conn_err(tconn, "sock_recvmsg returned %d\n", rv); |
b411b363 PR |
540 | break; |
541 | } else if (rv == 0) { | |
de0ff338 | 542 | conn_info(tconn, "sock was shut down by peer\n"); |
b411b363 PR |
543 | break; |
544 | } else { | |
545 | /* signal came in, or peer/link went down, | |
546 | * after we read a partial message | |
547 | */ | |
548 | /* D_ASSERT(signal_pending(current)); */ | |
549 | break; | |
550 | } | |
551 | }; | |
552 | ||
553 | set_fs(oldfs); | |
554 | ||
555 | if (rv != size) | |
bbeb641c | 556 | conn_request_state(tconn, NS(conn, C_BROKEN_PIPE), CS_HARD); |
b411b363 PR |
557 | |
558 | return rv; | |
559 | } | |
560 | ||
c6967746 AG |
561 | static int drbd_recv_all(struct drbd_tconn *tconn, void *buf, size_t size) |
562 | { | |
563 | int err; | |
564 | ||
565 | err = drbd_recv(tconn, buf, size); | |
566 | if (err != size) { | |
567 | if (err >= 0) | |
568 | err = -EIO; | |
569 | } else | |
570 | err = 0; | |
571 | return err; | |
572 | } | |
573 | ||
a5c31904 AG |
574 | static int drbd_recv_all_warn(struct drbd_tconn *tconn, void *buf, size_t size) |
575 | { | |
576 | int err; | |
577 | ||
578 | err = drbd_recv_all(tconn, buf, size); | |
579 | if (err && !signal_pending(current)) | |
580 | conn_warn(tconn, "short read (expected size %d)\n", (int)size); | |
581 | return err; | |
582 | } | |
583 | ||
5dbf1673 LE |
584 | /* quoting tcp(7): |
585 | * On individual connections, the socket buffer size must be set prior to the | |
586 | * listen(2) or connect(2) calls in order to have it take effect. | |
587 | * This is our wrapper to do so. | |
588 | */ | |
589 | static void drbd_setbufsize(struct socket *sock, unsigned int snd, | |
590 | unsigned int rcv) | |
591 | { | |
592 | /* open coded SO_SNDBUF, SO_RCVBUF */ | |
593 | if (snd) { | |
594 | sock->sk->sk_sndbuf = snd; | |
595 | sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; | |
596 | } | |
597 | if (rcv) { | |
598 | sock->sk->sk_rcvbuf = rcv; | |
599 | sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; | |
600 | } | |
601 | } | |
602 | ||
eac3e990 | 603 | static struct socket *drbd_try_connect(struct drbd_tconn *tconn) |
b411b363 PR |
604 | { |
605 | const char *what; | |
606 | struct socket *sock; | |
607 | struct sockaddr_in6 src_in6; | |
608 | int err; | |
609 | int disconnect_on_error = 1; | |
610 | ||
eac3e990 | 611 | if (!get_net_conf(tconn)) |
b411b363 PR |
612 | return NULL; |
613 | ||
614 | what = "sock_create_kern"; | |
eac3e990 | 615 | err = sock_create_kern(((struct sockaddr *)tconn->net_conf->my_addr)->sa_family, |
b411b363 PR |
616 | SOCK_STREAM, IPPROTO_TCP, &sock); |
617 | if (err < 0) { | |
618 | sock = NULL; | |
619 | goto out; | |
620 | } | |
621 | ||
622 | sock->sk->sk_rcvtimeo = | |
eac3e990 PR |
623 | sock->sk->sk_sndtimeo = tconn->net_conf->try_connect_int*HZ; |
624 | drbd_setbufsize(sock, tconn->net_conf->sndbuf_size, | |
625 | tconn->net_conf->rcvbuf_size); | |
b411b363 PR |
626 | |
627 | /* explicitly bind to the configured IP as source IP | |
628 | * for the outgoing connections. | |
629 | * This is needed for multihomed hosts and to be | |
630 | * able to use lo: interfaces for drbd. | |
631 | * Make sure to use 0 as port number, so linux selects | |
632 | * a free one dynamically. | |
633 | */ | |
eac3e990 PR |
634 | memcpy(&src_in6, tconn->net_conf->my_addr, |
635 | min_t(int, tconn->net_conf->my_addr_len, sizeof(src_in6))); | |
636 | if (((struct sockaddr *)tconn->net_conf->my_addr)->sa_family == AF_INET6) | |
b411b363 PR |
637 | src_in6.sin6_port = 0; |
638 | else | |
639 | ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ | |
640 | ||
641 | what = "bind before connect"; | |
642 | err = sock->ops->bind(sock, | |
643 | (struct sockaddr *) &src_in6, | |
eac3e990 | 644 | tconn->net_conf->my_addr_len); |
b411b363 PR |
645 | if (err < 0) |
646 | goto out; | |
647 | ||
648 | /* connect may fail, peer not yet available. | |
649 | * stay C_WF_CONNECTION, don't go Disconnecting! */ | |
650 | disconnect_on_error = 0; | |
651 | what = "connect"; | |
652 | err = sock->ops->connect(sock, | |
eac3e990 PR |
653 | (struct sockaddr *)tconn->net_conf->peer_addr, |
654 | tconn->net_conf->peer_addr_len, 0); | |
b411b363 PR |
655 | |
656 | out: | |
657 | if (err < 0) { | |
658 | if (sock) { | |
659 | sock_release(sock); | |
660 | sock = NULL; | |
661 | } | |
662 | switch (-err) { | |
663 | /* timeout, busy, signal pending */ | |
664 | case ETIMEDOUT: case EAGAIN: case EINPROGRESS: | |
665 | case EINTR: case ERESTARTSYS: | |
666 | /* peer not (yet) available, network problem */ | |
667 | case ECONNREFUSED: case ENETUNREACH: | |
668 | case EHOSTDOWN: case EHOSTUNREACH: | |
669 | disconnect_on_error = 0; | |
670 | break; | |
671 | default: | |
eac3e990 | 672 | conn_err(tconn, "%s failed, err = %d\n", what, err); |
b411b363 PR |
673 | } |
674 | if (disconnect_on_error) | |
bbeb641c | 675 | conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 | 676 | } |
eac3e990 | 677 | put_net_conf(tconn); |
b411b363 PR |
678 | return sock; |
679 | } | |
680 | ||
7653620d | 681 | static struct socket *drbd_wait_for_connect(struct drbd_tconn *tconn) |
b411b363 PR |
682 | { |
683 | int timeo, err; | |
684 | struct socket *s_estab = NULL, *s_listen; | |
685 | const char *what; | |
686 | ||
7653620d | 687 | if (!get_net_conf(tconn)) |
b411b363 PR |
688 | return NULL; |
689 | ||
690 | what = "sock_create_kern"; | |
7653620d | 691 | err = sock_create_kern(((struct sockaddr *)tconn->net_conf->my_addr)->sa_family, |
b411b363 PR |
692 | SOCK_STREAM, IPPROTO_TCP, &s_listen); |
693 | if (err) { | |
694 | s_listen = NULL; | |
695 | goto out; | |
696 | } | |
697 | ||
7653620d | 698 | timeo = tconn->net_conf->try_connect_int * HZ; |
b411b363 PR |
699 | timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */ |
700 | ||
701 | s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */ | |
702 | s_listen->sk->sk_rcvtimeo = timeo; | |
703 | s_listen->sk->sk_sndtimeo = timeo; | |
7653620d PR |
704 | drbd_setbufsize(s_listen, tconn->net_conf->sndbuf_size, |
705 | tconn->net_conf->rcvbuf_size); | |
b411b363 PR |
706 | |
707 | what = "bind before listen"; | |
708 | err = s_listen->ops->bind(s_listen, | |
7653620d PR |
709 | (struct sockaddr *) tconn->net_conf->my_addr, |
710 | tconn->net_conf->my_addr_len); | |
b411b363 PR |
711 | if (err < 0) |
712 | goto out; | |
713 | ||
7653620d | 714 | err = drbd_accept(&what, s_listen, &s_estab); |
b411b363 PR |
715 | |
716 | out: | |
717 | if (s_listen) | |
718 | sock_release(s_listen); | |
719 | if (err < 0) { | |
720 | if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { | |
7653620d | 721 | conn_err(tconn, "%s failed, err = %d\n", what, err); |
bbeb641c | 722 | conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 PR |
723 | } |
724 | } | |
7653620d | 725 | put_net_conf(tconn); |
b411b363 PR |
726 | |
727 | return s_estab; | |
728 | } | |
729 | ||
e658983a | 730 | static int decode_header(struct drbd_tconn *, void *, struct packet_info *); |
b411b363 | 731 | |
9f5bdc33 AG |
732 | static int send_first_packet(struct drbd_tconn *tconn, struct drbd_socket *sock, |
733 | enum drbd_packet cmd) | |
734 | { | |
735 | if (!conn_prepare_command(tconn, sock)) | |
736 | return -EIO; | |
e658983a | 737 | return conn_send_command(tconn, sock, cmd, 0, NULL, 0); |
b411b363 PR |
738 | } |
739 | ||
9f5bdc33 | 740 | static int receive_first_packet(struct drbd_tconn *tconn, struct socket *sock) |
b411b363 | 741 | { |
9f5bdc33 AG |
742 | unsigned int header_size = drbd_header_size(tconn); |
743 | struct packet_info pi; | |
744 | int err; | |
b411b363 | 745 | |
9f5bdc33 AG |
746 | err = drbd_recv_short(sock, tconn->data.rbuf, header_size, 0); |
747 | if (err != header_size) { | |
748 | if (err >= 0) | |
749 | err = -EIO; | |
750 | return err; | |
751 | } | |
752 | err = decode_header(tconn, tconn->data.rbuf, &pi); | |
753 | if (err) | |
754 | return err; | |
755 | return pi.cmd; | |
b411b363 PR |
756 | } |
757 | ||
758 | /** | |
759 | * drbd_socket_okay() - Free the socket if its connection is not okay | |
b411b363 PR |
760 | * @sock: pointer to the pointer to the socket. |
761 | */ | |
dbd9eea0 | 762 | static int drbd_socket_okay(struct socket **sock) |
b411b363 PR |
763 | { |
764 | int rr; | |
765 | char tb[4]; | |
766 | ||
767 | if (!*sock) | |
81e84650 | 768 | return false; |
b411b363 | 769 | |
dbd9eea0 | 770 | rr = drbd_recv_short(*sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); |
b411b363 PR |
771 | |
772 | if (rr > 0 || rr == -EAGAIN) { | |
81e84650 | 773 | return true; |
b411b363 PR |
774 | } else { |
775 | sock_release(*sock); | |
776 | *sock = NULL; | |
81e84650 | 777 | return false; |
b411b363 PR |
778 | } |
779 | } | |
2325eb66 PR |
780 | /* Gets called if a connection is established, or if a new minor gets created |
781 | in a connection */ | |
782 | int drbd_connected(int vnr, void *p, void *data) | |
907599e0 PR |
783 | { |
784 | struct drbd_conf *mdev = (struct drbd_conf *)p; | |
0829f5ed | 785 | int err; |
907599e0 PR |
786 | |
787 | atomic_set(&mdev->packet_seq, 0); | |
788 | mdev->peer_seq = 0; | |
789 | ||
8410da8f PR |
790 | mdev->state_mutex = mdev->tconn->agreed_pro_version < 100 ? |
791 | &mdev->tconn->cstate_mutex : | |
792 | &mdev->own_state_mutex; | |
793 | ||
0829f5ed AG |
794 | err = drbd_send_sync_param(mdev); |
795 | if (!err) | |
796 | err = drbd_send_sizes(mdev, 0, 0); | |
797 | if (!err) | |
798 | err = drbd_send_uuids(mdev); | |
799 | if (!err) | |
800 | err = drbd_send_state(mdev); | |
907599e0 PR |
801 | clear_bit(USE_DEGR_WFC_T, &mdev->flags); |
802 | clear_bit(RESIZE_PENDING, &mdev->flags); | |
8b924f1d | 803 | mod_timer(&mdev->request_timer, jiffies + HZ); /* just start it here. */ |
0829f5ed | 804 | return err; |
907599e0 PR |
805 | } |
806 | ||
b411b363 PR |
807 | /* |
808 | * return values: | |
809 | * 1 yes, we have a valid connection | |
810 | * 0 oops, did not work out, please try again | |
811 | * -1 peer talks different language, | |
812 | * no point in trying again, please go standalone. | |
813 | * -2 We do not have a network config... | |
814 | */ | |
907599e0 | 815 | static int drbd_connect(struct drbd_tconn *tconn) |
b411b363 | 816 | { |
2bf89621 | 817 | struct socket *sock, *msock; |
b411b363 PR |
818 | int try, h, ok; |
819 | ||
bbeb641c | 820 | if (conn_request_state(tconn, NS(conn, C_WF_CONNECTION), CS_VERBOSE) < SS_SUCCESS) |
b411b363 PR |
821 | return -2; |
822 | ||
907599e0 | 823 | clear_bit(DISCARD_CONCURRENT, &tconn->flags); |
0916e0e3 AG |
824 | |
825 | /* Assume that the peer only understands protocol 80 until we know better. */ | |
826 | tconn->agreed_pro_version = 80; | |
b411b363 | 827 | |
b411b363 | 828 | do { |
2bf89621 AG |
829 | struct socket *s; |
830 | ||
b411b363 PR |
831 | for (try = 0;;) { |
832 | /* 3 tries, this should take less than a second! */ | |
907599e0 | 833 | s = drbd_try_connect(tconn); |
b411b363 PR |
834 | if (s || ++try >= 3) |
835 | break; | |
836 | /* give the other side time to call bind() & listen() */ | |
20ee6390 | 837 | schedule_timeout_interruptible(HZ / 10); |
b411b363 PR |
838 | } |
839 | ||
840 | if (s) { | |
2bf89621 AG |
841 | if (!tconn->data.socket) { |
842 | tconn->data.socket = s; | |
9f5bdc33 | 843 | send_first_packet(tconn, &tconn->data, P_INITIAL_DATA); |
2bf89621 AG |
844 | } else if (!tconn->meta.socket) { |
845 | tconn->meta.socket = s; | |
9f5bdc33 | 846 | send_first_packet(tconn, &tconn->meta, P_INITIAL_META); |
b411b363 | 847 | } else { |
907599e0 | 848 | conn_err(tconn, "Logic error in drbd_connect()\n"); |
b411b363 PR |
849 | goto out_release_sockets; |
850 | } | |
851 | } | |
852 | ||
2bf89621 | 853 | if (tconn->data.socket && tconn->meta.socket) { |
907599e0 | 854 | schedule_timeout_interruptible(tconn->net_conf->ping_timeo*HZ/10); |
2bf89621 AG |
855 | ok = drbd_socket_okay(&tconn->data.socket); |
856 | ok = drbd_socket_okay(&tconn->meta.socket) && ok; | |
b411b363 PR |
857 | if (ok) |
858 | break; | |
859 | } | |
860 | ||
861 | retry: | |
907599e0 | 862 | s = drbd_wait_for_connect(tconn); |
b411b363 | 863 | if (s) { |
9f5bdc33 | 864 | try = receive_first_packet(tconn, s); |
2bf89621 AG |
865 | drbd_socket_okay(&tconn->data.socket); |
866 | drbd_socket_okay(&tconn->meta.socket); | |
b411b363 | 867 | switch (try) { |
e5d6f33a | 868 | case P_INITIAL_DATA: |
2bf89621 | 869 | if (tconn->data.socket) { |
907599e0 | 870 | conn_warn(tconn, "initial packet S crossed\n"); |
2bf89621 | 871 | sock_release(tconn->data.socket); |
b411b363 | 872 | } |
2bf89621 | 873 | tconn->data.socket = s; |
b411b363 | 874 | break; |
e5d6f33a | 875 | case P_INITIAL_META: |
2bf89621 | 876 | if (tconn->meta.socket) { |
907599e0 | 877 | conn_warn(tconn, "initial packet M crossed\n"); |
2bf89621 | 878 | sock_release(tconn->meta.socket); |
b411b363 | 879 | } |
2bf89621 | 880 | tconn->meta.socket = s; |
907599e0 | 881 | set_bit(DISCARD_CONCURRENT, &tconn->flags); |
b411b363 PR |
882 | break; |
883 | default: | |
907599e0 | 884 | conn_warn(tconn, "Error receiving initial packet\n"); |
b411b363 PR |
885 | sock_release(s); |
886 | if (random32() & 1) | |
887 | goto retry; | |
888 | } | |
889 | } | |
890 | ||
bbeb641c | 891 | if (tconn->cstate <= C_DISCONNECTING) |
b411b363 PR |
892 | goto out_release_sockets; |
893 | if (signal_pending(current)) { | |
894 | flush_signals(current); | |
895 | smp_rmb(); | |
907599e0 | 896 | if (get_t_state(&tconn->receiver) == EXITING) |
b411b363 PR |
897 | goto out_release_sockets; |
898 | } | |
899 | ||
2bf89621 AG |
900 | if (tconn->data.socket && &tconn->meta.socket) { |
901 | ok = drbd_socket_okay(&tconn->data.socket); | |
902 | ok = drbd_socket_okay(&tconn->meta.socket) && ok; | |
b411b363 PR |
903 | if (ok) |
904 | break; | |
905 | } | |
906 | } while (1); | |
907 | ||
2bf89621 AG |
908 | sock = tconn->data.socket; |
909 | msock = tconn->meta.socket; | |
910 | ||
b411b363 PR |
911 | msock->sk->sk_reuse = 1; /* SO_REUSEADDR */ |
912 | sock->sk->sk_reuse = 1; /* SO_REUSEADDR */ | |
913 | ||
914 | sock->sk->sk_allocation = GFP_NOIO; | |
915 | msock->sk->sk_allocation = GFP_NOIO; | |
916 | ||
917 | sock->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; | |
918 | msock->sk->sk_priority = TC_PRIO_INTERACTIVE; | |
919 | ||
b411b363 | 920 | /* NOT YET ... |
907599e0 | 921 | * sock->sk->sk_sndtimeo = tconn->net_conf->timeout*HZ/10; |
b411b363 | 922 | * sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; |
6038178e | 923 | * first set it to the P_CONNECTION_FEATURES timeout, |
b411b363 PR |
924 | * which we set to 4x the configured ping_timeout. */ |
925 | sock->sk->sk_sndtimeo = | |
907599e0 | 926 | sock->sk->sk_rcvtimeo = tconn->net_conf->ping_timeo*4*HZ/10; |
b411b363 | 927 | |
907599e0 PR |
928 | msock->sk->sk_sndtimeo = tconn->net_conf->timeout*HZ/10; |
929 | msock->sk->sk_rcvtimeo = tconn->net_conf->ping_int*HZ; | |
b411b363 PR |
930 | |
931 | /* we don't want delays. | |
25985edc | 932 | * we use TCP_CORK where appropriate, though */ |
b411b363 PR |
933 | drbd_tcp_nodelay(sock); |
934 | drbd_tcp_nodelay(msock); | |
935 | ||
907599e0 | 936 | tconn->last_received = jiffies; |
b411b363 | 937 | |
6038178e | 938 | h = drbd_do_features(tconn); |
b411b363 PR |
939 | if (h <= 0) |
940 | return h; | |
941 | ||
907599e0 | 942 | if (tconn->cram_hmac_tfm) { |
b411b363 | 943 | /* drbd_request_state(mdev, NS(conn, WFAuth)); */ |
907599e0 | 944 | switch (drbd_do_auth(tconn)) { |
b10d96cb | 945 | case -1: |
907599e0 | 946 | conn_err(tconn, "Authentication of peer failed\n"); |
b411b363 | 947 | return -1; |
b10d96cb | 948 | case 0: |
907599e0 | 949 | conn_err(tconn, "Authentication of peer failed, trying again.\n"); |
b10d96cb | 950 | return 0; |
b411b363 PR |
951 | } |
952 | } | |
953 | ||
bbeb641c | 954 | if (conn_request_state(tconn, NS(conn, C_WF_REPORT_PARAMS), CS_VERBOSE) < SS_SUCCESS) |
b411b363 PR |
955 | return 0; |
956 | ||
907599e0 | 957 | sock->sk->sk_sndtimeo = tconn->net_conf->timeout*HZ/10; |
b411b363 PR |
958 | sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; |
959 | ||
907599e0 | 960 | drbd_thread_start(&tconn->asender); |
b411b363 | 961 | |
387eb308 | 962 | if (drbd_send_protocol(tconn) == -EOPNOTSUPP) |
7e2455c1 | 963 | return -1; |
b411b363 | 964 | |
907599e0 | 965 | return !idr_for_each(&tconn->volumes, drbd_connected, tconn); |
b411b363 PR |
966 | |
967 | out_release_sockets: | |
2bf89621 AG |
968 | if (tconn->data.socket) { |
969 | sock_release(tconn->data.socket); | |
970 | tconn->data.socket = NULL; | |
971 | } | |
972 | if (tconn->meta.socket) { | |
973 | sock_release(tconn->meta.socket); | |
974 | tconn->meta.socket = NULL; | |
975 | } | |
b411b363 PR |
976 | return -1; |
977 | } | |
978 | ||
e658983a | 979 | static int decode_header(struct drbd_tconn *tconn, void *header, struct packet_info *pi) |
b411b363 | 980 | { |
e658983a AG |
981 | unsigned int header_size = drbd_header_size(tconn); |
982 | ||
0c8e36d9 AG |
983 | if (header_size == sizeof(struct p_header100) && |
984 | *(__be32 *)header == cpu_to_be32(DRBD_MAGIC_100)) { | |
985 | struct p_header100 *h = header; | |
986 | if (h->pad != 0) { | |
987 | conn_err(tconn, "Header padding is not zero\n"); | |
988 | return -EINVAL; | |
989 | } | |
990 | pi->vnr = be16_to_cpu(h->volume); | |
991 | pi->cmd = be16_to_cpu(h->command); | |
992 | pi->size = be32_to_cpu(h->length); | |
993 | } else if (header_size == sizeof(struct p_header95) && | |
994 | *(__be16 *)header == cpu_to_be16(DRBD_MAGIC_BIG)) { | |
e658983a | 995 | struct p_header95 *h = header; |
e658983a | 996 | pi->cmd = be16_to_cpu(h->command); |
b55d84ba AG |
997 | pi->size = be32_to_cpu(h->length); |
998 | pi->vnr = 0; | |
e658983a AG |
999 | } else if (header_size == sizeof(struct p_header80) && |
1000 | *(__be32 *)header == cpu_to_be32(DRBD_MAGIC)) { | |
1001 | struct p_header80 *h = header; | |
1002 | pi->cmd = be16_to_cpu(h->command); | |
1003 | pi->size = be16_to_cpu(h->length); | |
77351055 | 1004 | pi->vnr = 0; |
02918be2 | 1005 | } else { |
e658983a AG |
1006 | conn_err(tconn, "Wrong magic value 0x%08x in protocol version %d\n", |
1007 | be32_to_cpu(*(__be32 *)header), | |
1008 | tconn->agreed_pro_version); | |
8172f3e9 | 1009 | return -EINVAL; |
b411b363 | 1010 | } |
e658983a | 1011 | pi->data = header + header_size; |
8172f3e9 | 1012 | return 0; |
257d0af6 PR |
1013 | } |
1014 | ||
9ba7aa00 | 1015 | static int drbd_recv_header(struct drbd_tconn *tconn, struct packet_info *pi) |
257d0af6 | 1016 | { |
e658983a | 1017 | void *buffer = tconn->data.rbuf; |
69bc7bc3 | 1018 | int err; |
257d0af6 | 1019 | |
e658983a | 1020 | err = drbd_recv_all_warn(tconn, buffer, drbd_header_size(tconn)); |
a5c31904 | 1021 | if (err) |
69bc7bc3 | 1022 | return err; |
257d0af6 | 1023 | |
e658983a | 1024 | err = decode_header(tconn, buffer, pi); |
9ba7aa00 | 1025 | tconn->last_received = jiffies; |
b411b363 | 1026 | |
69bc7bc3 | 1027 | return err; |
b411b363 PR |
1028 | } |
1029 | ||
2451fc3b | 1030 | static void drbd_flush(struct drbd_conf *mdev) |
b411b363 PR |
1031 | { |
1032 | int rv; | |
1033 | ||
1034 | if (mdev->write_ordering >= WO_bdev_flush && get_ldev(mdev)) { | |
fbd9b09a | 1035 | rv = blkdev_issue_flush(mdev->ldev->backing_bdev, GFP_KERNEL, |
dd3932ed | 1036 | NULL); |
b411b363 PR |
1037 | if (rv) { |
1038 | dev_err(DEV, "local disk flush failed with status %d\n", rv); | |
1039 | /* would rather check on EOPNOTSUPP, but that is not reliable. | |
1040 | * don't try again for ANY return value != 0 | |
1041 | * if (rv == -EOPNOTSUPP) */ | |
1042 | drbd_bump_write_ordering(mdev, WO_drain_io); | |
1043 | } | |
1044 | put_ldev(mdev); | |
1045 | } | |
b411b363 PR |
1046 | } |
1047 | ||
1048 | /** | |
1049 | * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. | |
1050 | * @mdev: DRBD device. | |
1051 | * @epoch: Epoch object. | |
1052 | * @ev: Epoch event. | |
1053 | */ | |
1054 | static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev, | |
1055 | struct drbd_epoch *epoch, | |
1056 | enum epoch_event ev) | |
1057 | { | |
2451fc3b | 1058 | int epoch_size; |
b411b363 | 1059 | struct drbd_epoch *next_epoch; |
b411b363 PR |
1060 | enum finish_epoch rv = FE_STILL_LIVE; |
1061 | ||
1062 | spin_lock(&mdev->epoch_lock); | |
1063 | do { | |
1064 | next_epoch = NULL; | |
b411b363 PR |
1065 | |
1066 | epoch_size = atomic_read(&epoch->epoch_size); | |
1067 | ||
1068 | switch (ev & ~EV_CLEANUP) { | |
1069 | case EV_PUT: | |
1070 | atomic_dec(&epoch->active); | |
1071 | break; | |
1072 | case EV_GOT_BARRIER_NR: | |
1073 | set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); | |
b411b363 PR |
1074 | break; |
1075 | case EV_BECAME_LAST: | |
1076 | /* nothing to do*/ | |
1077 | break; | |
1078 | } | |
1079 | ||
b411b363 PR |
1080 | if (epoch_size != 0 && |
1081 | atomic_read(&epoch->active) == 0 && | |
2451fc3b | 1082 | test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) { |
b411b363 PR |
1083 | if (!(ev & EV_CLEANUP)) { |
1084 | spin_unlock(&mdev->epoch_lock); | |
1085 | drbd_send_b_ack(mdev, epoch->barrier_nr, epoch_size); | |
1086 | spin_lock(&mdev->epoch_lock); | |
1087 | } | |
1088 | dec_unacked(mdev); | |
1089 | ||
1090 | if (mdev->current_epoch != epoch) { | |
1091 | next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); | |
1092 | list_del(&epoch->list); | |
1093 | ev = EV_BECAME_LAST | (ev & EV_CLEANUP); | |
1094 | mdev->epochs--; | |
b411b363 PR |
1095 | kfree(epoch); |
1096 | ||
1097 | if (rv == FE_STILL_LIVE) | |
1098 | rv = FE_DESTROYED; | |
1099 | } else { | |
1100 | epoch->flags = 0; | |
1101 | atomic_set(&epoch->epoch_size, 0); | |
698f9315 | 1102 | /* atomic_set(&epoch->active, 0); is already zero */ |
b411b363 PR |
1103 | if (rv == FE_STILL_LIVE) |
1104 | rv = FE_RECYCLED; | |
2451fc3b | 1105 | wake_up(&mdev->ee_wait); |
b411b363 PR |
1106 | } |
1107 | } | |
1108 | ||
1109 | if (!next_epoch) | |
1110 | break; | |
1111 | ||
1112 | epoch = next_epoch; | |
1113 | } while (1); | |
1114 | ||
1115 | spin_unlock(&mdev->epoch_lock); | |
1116 | ||
b411b363 PR |
1117 | return rv; |
1118 | } | |
1119 | ||
1120 | /** | |
1121 | * drbd_bump_write_ordering() - Fall back to an other write ordering method | |
1122 | * @mdev: DRBD device. | |
1123 | * @wo: Write ordering method to try. | |
1124 | */ | |
1125 | void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo) __must_hold(local) | |
1126 | { | |
1127 | enum write_ordering_e pwo; | |
1128 | static char *write_ordering_str[] = { | |
1129 | [WO_none] = "none", | |
1130 | [WO_drain_io] = "drain", | |
1131 | [WO_bdev_flush] = "flush", | |
b411b363 PR |
1132 | }; |
1133 | ||
1134 | pwo = mdev->write_ordering; | |
1135 | wo = min(pwo, wo); | |
b411b363 PR |
1136 | if (wo == WO_bdev_flush && mdev->ldev->dc.no_disk_flush) |
1137 | wo = WO_drain_io; | |
1138 | if (wo == WO_drain_io && mdev->ldev->dc.no_disk_drain) | |
1139 | wo = WO_none; | |
1140 | mdev->write_ordering = wo; | |
2451fc3b | 1141 | if (pwo != mdev->write_ordering || wo == WO_bdev_flush) |
b411b363 PR |
1142 | dev_info(DEV, "Method to ensure write ordering: %s\n", write_ordering_str[mdev->write_ordering]); |
1143 | } | |
1144 | ||
45bb912b | 1145 | /** |
fbe29dec | 1146 | * drbd_submit_peer_request() |
45bb912b | 1147 | * @mdev: DRBD device. |
db830c46 | 1148 | * @peer_req: peer request |
45bb912b | 1149 | * @rw: flag field, see bio->bi_rw |
10f6d992 LE |
1150 | * |
1151 | * May spread the pages to multiple bios, | |
1152 | * depending on bio_add_page restrictions. | |
1153 | * | |
1154 | * Returns 0 if all bios have been submitted, | |
1155 | * -ENOMEM if we could not allocate enough bios, | |
1156 | * -ENOSPC (any better suggestion?) if we have not been able to bio_add_page a | |
1157 | * single page to an empty bio (which should never happen and likely indicates | |
1158 | * that the lower level IO stack is in some way broken). This has been observed | |
1159 | * on certain Xen deployments. | |
45bb912b LE |
1160 | */ |
1161 | /* TODO allocate from our own bio_set. */ | |
fbe29dec AG |
1162 | int drbd_submit_peer_request(struct drbd_conf *mdev, |
1163 | struct drbd_peer_request *peer_req, | |
1164 | const unsigned rw, const int fault_type) | |
45bb912b LE |
1165 | { |
1166 | struct bio *bios = NULL; | |
1167 | struct bio *bio; | |
db830c46 AG |
1168 | struct page *page = peer_req->pages; |
1169 | sector_t sector = peer_req->i.sector; | |
1170 | unsigned ds = peer_req->i.size; | |
45bb912b LE |
1171 | unsigned n_bios = 0; |
1172 | unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT; | |
10f6d992 | 1173 | int err = -ENOMEM; |
45bb912b LE |
1174 | |
1175 | /* In most cases, we will only need one bio. But in case the lower | |
1176 | * level restrictions happen to be different at this offset on this | |
1177 | * side than those of the sending peer, we may need to submit the | |
da4a75d2 LE |
1178 | * request in more than one bio. |
1179 | * | |
1180 | * Plain bio_alloc is good enough here, this is no DRBD internally | |
1181 | * generated bio, but a bio allocated on behalf of the peer. | |
1182 | */ | |
45bb912b LE |
1183 | next_bio: |
1184 | bio = bio_alloc(GFP_NOIO, nr_pages); | |
1185 | if (!bio) { | |
1186 | dev_err(DEV, "submit_ee: Allocation of a bio failed\n"); | |
1187 | goto fail; | |
1188 | } | |
db830c46 | 1189 | /* > peer_req->i.sector, unless this is the first bio */ |
45bb912b LE |
1190 | bio->bi_sector = sector; |
1191 | bio->bi_bdev = mdev->ldev->backing_bdev; | |
45bb912b | 1192 | bio->bi_rw = rw; |
db830c46 | 1193 | bio->bi_private = peer_req; |
fcefa62e | 1194 | bio->bi_end_io = drbd_peer_request_endio; |
45bb912b LE |
1195 | |
1196 | bio->bi_next = bios; | |
1197 | bios = bio; | |
1198 | ++n_bios; | |
1199 | ||
1200 | page_chain_for_each(page) { | |
1201 | unsigned len = min_t(unsigned, ds, PAGE_SIZE); | |
1202 | if (!bio_add_page(bio, page, len, 0)) { | |
10f6d992 LE |
1203 | /* A single page must always be possible! |
1204 | * But in case it fails anyways, | |
1205 | * we deal with it, and complain (below). */ | |
1206 | if (bio->bi_vcnt == 0) { | |
1207 | dev_err(DEV, | |
1208 | "bio_add_page failed for len=%u, " | |
1209 | "bi_vcnt=0 (bi_sector=%llu)\n", | |
1210 | len, (unsigned long long)bio->bi_sector); | |
1211 | err = -ENOSPC; | |
1212 | goto fail; | |
1213 | } | |
45bb912b LE |
1214 | goto next_bio; |
1215 | } | |
1216 | ds -= len; | |
1217 | sector += len >> 9; | |
1218 | --nr_pages; | |
1219 | } | |
1220 | D_ASSERT(page == NULL); | |
1221 | D_ASSERT(ds == 0); | |
1222 | ||
db830c46 | 1223 | atomic_set(&peer_req->pending_bios, n_bios); |
45bb912b LE |
1224 | do { |
1225 | bio = bios; | |
1226 | bios = bios->bi_next; | |
1227 | bio->bi_next = NULL; | |
1228 | ||
45bb912b | 1229 | drbd_generic_make_request(mdev, fault_type, bio); |
45bb912b | 1230 | } while (bios); |
45bb912b LE |
1231 | return 0; |
1232 | ||
1233 | fail: | |
1234 | while (bios) { | |
1235 | bio = bios; | |
1236 | bios = bios->bi_next; | |
1237 | bio_put(bio); | |
1238 | } | |
10f6d992 | 1239 | return err; |
45bb912b LE |
1240 | } |
1241 | ||
53840641 | 1242 | static void drbd_remove_epoch_entry_interval(struct drbd_conf *mdev, |
db830c46 | 1243 | struct drbd_peer_request *peer_req) |
53840641 | 1244 | { |
db830c46 | 1245 | struct drbd_interval *i = &peer_req->i; |
53840641 AG |
1246 | |
1247 | drbd_remove_interval(&mdev->write_requests, i); | |
1248 | drbd_clear_interval(i); | |
1249 | ||
6c852bec | 1250 | /* Wake up any processes waiting for this peer request to complete. */ |
53840641 AG |
1251 | if (i->waiting) |
1252 | wake_up(&mdev->misc_wait); | |
1253 | } | |
1254 | ||
4a76b161 | 1255 | static int receive_Barrier(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 1256 | { |
4a76b161 | 1257 | struct drbd_conf *mdev; |
2451fc3b | 1258 | int rv; |
e658983a | 1259 | struct p_barrier *p = pi->data; |
b411b363 PR |
1260 | struct drbd_epoch *epoch; |
1261 | ||
4a76b161 AG |
1262 | mdev = vnr_to_mdev(tconn, pi->vnr); |
1263 | if (!mdev) | |
1264 | return -EIO; | |
1265 | ||
b411b363 PR |
1266 | inc_unacked(mdev); |
1267 | ||
b411b363 PR |
1268 | mdev->current_epoch->barrier_nr = p->barrier; |
1269 | rv = drbd_may_finish_epoch(mdev, mdev->current_epoch, EV_GOT_BARRIER_NR); | |
1270 | ||
1271 | /* P_BARRIER_ACK may imply that the corresponding extent is dropped from | |
1272 | * the activity log, which means it would not be resynced in case the | |
1273 | * R_PRIMARY crashes now. | |
1274 | * Therefore we must send the barrier_ack after the barrier request was | |
1275 | * completed. */ | |
1276 | switch (mdev->write_ordering) { | |
b411b363 PR |
1277 | case WO_none: |
1278 | if (rv == FE_RECYCLED) | |
82bc0194 | 1279 | return 0; |
2451fc3b PR |
1280 | |
1281 | /* receiver context, in the writeout path of the other node. | |
1282 | * avoid potential distributed deadlock */ | |
1283 | epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); | |
1284 | if (epoch) | |
1285 | break; | |
1286 | else | |
1287 | dev_warn(DEV, "Allocation of an epoch failed, slowing down\n"); | |
1288 | /* Fall through */ | |
b411b363 PR |
1289 | |
1290 | case WO_bdev_flush: | |
1291 | case WO_drain_io: | |
b411b363 | 1292 | drbd_wait_ee_list_empty(mdev, &mdev->active_ee); |
2451fc3b PR |
1293 | drbd_flush(mdev); |
1294 | ||
1295 | if (atomic_read(&mdev->current_epoch->epoch_size)) { | |
1296 | epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); | |
1297 | if (epoch) | |
1298 | break; | |
b411b363 PR |
1299 | } |
1300 | ||
2451fc3b PR |
1301 | epoch = mdev->current_epoch; |
1302 | wait_event(mdev->ee_wait, atomic_read(&epoch->epoch_size) == 0); | |
1303 | ||
1304 | D_ASSERT(atomic_read(&epoch->active) == 0); | |
1305 | D_ASSERT(epoch->flags == 0); | |
b411b363 | 1306 | |
82bc0194 | 1307 | return 0; |
2451fc3b PR |
1308 | default: |
1309 | dev_err(DEV, "Strangeness in mdev->write_ordering %d\n", mdev->write_ordering); | |
82bc0194 | 1310 | return -EIO; |
b411b363 PR |
1311 | } |
1312 | ||
1313 | epoch->flags = 0; | |
1314 | atomic_set(&epoch->epoch_size, 0); | |
1315 | atomic_set(&epoch->active, 0); | |
1316 | ||
1317 | spin_lock(&mdev->epoch_lock); | |
1318 | if (atomic_read(&mdev->current_epoch->epoch_size)) { | |
1319 | list_add(&epoch->list, &mdev->current_epoch->list); | |
1320 | mdev->current_epoch = epoch; | |
1321 | mdev->epochs++; | |
b411b363 PR |
1322 | } else { |
1323 | /* The current_epoch got recycled while we allocated this one... */ | |
1324 | kfree(epoch); | |
1325 | } | |
1326 | spin_unlock(&mdev->epoch_lock); | |
1327 | ||
82bc0194 | 1328 | return 0; |
b411b363 PR |
1329 | } |
1330 | ||
1331 | /* used from receive_RSDataReply (recv_resync_read) | |
1332 | * and from receive_Data */ | |
f6ffca9f AG |
1333 | static struct drbd_peer_request * |
1334 | read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, | |
1335 | int data_size) __must_hold(local) | |
b411b363 | 1336 | { |
6666032a | 1337 | const sector_t capacity = drbd_get_capacity(mdev->this_bdev); |
db830c46 | 1338 | struct drbd_peer_request *peer_req; |
b411b363 | 1339 | struct page *page; |
a5c31904 | 1340 | int dgs, ds, err; |
a0638456 PR |
1341 | void *dig_in = mdev->tconn->int_dig_in; |
1342 | void *dig_vv = mdev->tconn->int_dig_vv; | |
6b4388ac | 1343 | unsigned long *data; |
b411b363 | 1344 | |
a0638456 PR |
1345 | dgs = (mdev->tconn->agreed_pro_version >= 87 && mdev->tconn->integrity_r_tfm) ? |
1346 | crypto_hash_digestsize(mdev->tconn->integrity_r_tfm) : 0; | |
b411b363 PR |
1347 | |
1348 | if (dgs) { | |
9f5bdc33 AG |
1349 | /* |
1350 | * FIXME: Receive the incoming digest into the receive buffer | |
1351 | * here, together with its struct p_data? | |
1352 | */ | |
a5c31904 AG |
1353 | err = drbd_recv_all_warn(mdev->tconn, dig_in, dgs); |
1354 | if (err) | |
b411b363 | 1355 | return NULL; |
b411b363 PR |
1356 | } |
1357 | ||
1358 | data_size -= dgs; | |
1359 | ||
841ce241 AG |
1360 | if (!expect(data_size != 0)) |
1361 | return NULL; | |
1362 | if (!expect(IS_ALIGNED(data_size, 512))) | |
1363 | return NULL; | |
1364 | if (!expect(data_size <= DRBD_MAX_BIO_SIZE)) | |
1365 | return NULL; | |
b411b363 | 1366 | |
6666032a LE |
1367 | /* even though we trust out peer, |
1368 | * we sometimes have to double check. */ | |
1369 | if (sector + (data_size>>9) > capacity) { | |
fdda6544 LE |
1370 | dev_err(DEV, "request from peer beyond end of local disk: " |
1371 | "capacity: %llus < sector: %llus + size: %u\n", | |
6666032a LE |
1372 | (unsigned long long)capacity, |
1373 | (unsigned long long)sector, data_size); | |
1374 | return NULL; | |
1375 | } | |
1376 | ||
b411b363 PR |
1377 | /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD |
1378 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
1379 | * which in turn might block on the other node at this very place. */ | |
0db55363 | 1380 | peer_req = drbd_alloc_peer_req(mdev, id, sector, data_size, GFP_NOIO); |
db830c46 | 1381 | if (!peer_req) |
b411b363 | 1382 | return NULL; |
45bb912b | 1383 | |
b411b363 | 1384 | ds = data_size; |
db830c46 | 1385 | page = peer_req->pages; |
45bb912b LE |
1386 | page_chain_for_each(page) { |
1387 | unsigned len = min_t(int, ds, PAGE_SIZE); | |
6b4388ac | 1388 | data = kmap(page); |
a5c31904 | 1389 | err = drbd_recv_all_warn(mdev->tconn, data, len); |
0cf9d27e | 1390 | if (drbd_insert_fault(mdev, DRBD_FAULT_RECEIVE)) { |
6b4388ac PR |
1391 | dev_err(DEV, "Fault injection: Corrupting data on receive\n"); |
1392 | data[0] = data[0] ^ (unsigned long)-1; | |
1393 | } | |
b411b363 | 1394 | kunmap(page); |
a5c31904 | 1395 | if (err) { |
3967deb1 | 1396 | drbd_free_peer_req(mdev, peer_req); |
b411b363 PR |
1397 | return NULL; |
1398 | } | |
a5c31904 | 1399 | ds -= len; |
b411b363 PR |
1400 | } |
1401 | ||
1402 | if (dgs) { | |
db830c46 | 1403 | drbd_csum_ee(mdev, mdev->tconn->integrity_r_tfm, peer_req, dig_vv); |
b411b363 | 1404 | if (memcmp(dig_in, dig_vv, dgs)) { |
470be44a LE |
1405 | dev_err(DEV, "Digest integrity check FAILED: %llus +%u\n", |
1406 | (unsigned long long)sector, data_size); | |
3967deb1 | 1407 | drbd_free_peer_req(mdev, peer_req); |
b411b363 PR |
1408 | return NULL; |
1409 | } | |
1410 | } | |
1411 | mdev->recv_cnt += data_size>>9; | |
db830c46 | 1412 | return peer_req; |
b411b363 PR |
1413 | } |
1414 | ||
1415 | /* drbd_drain_block() just takes a data block | |
1416 | * out of the socket input buffer, and discards it. | |
1417 | */ | |
1418 | static int drbd_drain_block(struct drbd_conf *mdev, int data_size) | |
1419 | { | |
1420 | struct page *page; | |
a5c31904 | 1421 | int err = 0; |
b411b363 PR |
1422 | void *data; |
1423 | ||
c3470cde | 1424 | if (!data_size) |
fc5be839 | 1425 | return 0; |
c3470cde | 1426 | |
45bb912b | 1427 | page = drbd_pp_alloc(mdev, 1, 1); |
b411b363 PR |
1428 | |
1429 | data = kmap(page); | |
1430 | while (data_size) { | |
fc5be839 AG |
1431 | unsigned int len = min_t(int, data_size, PAGE_SIZE); |
1432 | ||
a5c31904 AG |
1433 | err = drbd_recv_all_warn(mdev->tconn, data, len); |
1434 | if (err) | |
b411b363 | 1435 | break; |
a5c31904 | 1436 | data_size -= len; |
b411b363 PR |
1437 | } |
1438 | kunmap(page); | |
435f0740 | 1439 | drbd_pp_free(mdev, page, 0); |
fc5be839 | 1440 | return err; |
b411b363 PR |
1441 | } |
1442 | ||
1443 | static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req, | |
1444 | sector_t sector, int data_size) | |
1445 | { | |
1446 | struct bio_vec *bvec; | |
1447 | struct bio *bio; | |
a5c31904 | 1448 | int dgs, err, i, expect; |
a0638456 PR |
1449 | void *dig_in = mdev->tconn->int_dig_in; |
1450 | void *dig_vv = mdev->tconn->int_dig_vv; | |
b411b363 | 1451 | |
a0638456 PR |
1452 | dgs = (mdev->tconn->agreed_pro_version >= 87 && mdev->tconn->integrity_r_tfm) ? |
1453 | crypto_hash_digestsize(mdev->tconn->integrity_r_tfm) : 0; | |
b411b363 PR |
1454 | |
1455 | if (dgs) { | |
a5c31904 AG |
1456 | err = drbd_recv_all_warn(mdev->tconn, dig_in, dgs); |
1457 | if (err) | |
1458 | return err; | |
b411b363 PR |
1459 | } |
1460 | ||
1461 | data_size -= dgs; | |
1462 | ||
1463 | /* optimistically update recv_cnt. if receiving fails below, | |
1464 | * we disconnect anyways, and counters will be reset. */ | |
1465 | mdev->recv_cnt += data_size>>9; | |
1466 | ||
1467 | bio = req->master_bio; | |
1468 | D_ASSERT(sector == bio->bi_sector); | |
1469 | ||
1470 | bio_for_each_segment(bvec, bio, i) { | |
a5c31904 | 1471 | void *mapped = kmap(bvec->bv_page) + bvec->bv_offset; |
b411b363 | 1472 | expect = min_t(int, data_size, bvec->bv_len); |
a5c31904 | 1473 | err = drbd_recv_all_warn(mdev->tconn, mapped, expect); |
b411b363 | 1474 | kunmap(bvec->bv_page); |
a5c31904 AG |
1475 | if (err) |
1476 | return err; | |
1477 | data_size -= expect; | |
b411b363 PR |
1478 | } |
1479 | ||
1480 | if (dgs) { | |
a0638456 | 1481 | drbd_csum_bio(mdev, mdev->tconn->integrity_r_tfm, bio, dig_vv); |
b411b363 PR |
1482 | if (memcmp(dig_in, dig_vv, dgs)) { |
1483 | dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n"); | |
28284cef | 1484 | return -EINVAL; |
b411b363 PR |
1485 | } |
1486 | } | |
1487 | ||
1488 | D_ASSERT(data_size == 0); | |
28284cef | 1489 | return 0; |
b411b363 PR |
1490 | } |
1491 | ||
a990be46 AG |
1492 | /* |
1493 | * e_end_resync_block() is called in asender context via | |
1494 | * drbd_finish_peer_reqs(). | |
1495 | */ | |
99920dc5 | 1496 | static int e_end_resync_block(struct drbd_work *w, int unused) |
b411b363 | 1497 | { |
8050e6d0 AG |
1498 | struct drbd_peer_request *peer_req = |
1499 | container_of(w, struct drbd_peer_request, w); | |
00d56944 | 1500 | struct drbd_conf *mdev = w->mdev; |
db830c46 | 1501 | sector_t sector = peer_req->i.sector; |
99920dc5 | 1502 | int err; |
b411b363 | 1503 | |
db830c46 | 1504 | D_ASSERT(drbd_interval_empty(&peer_req->i)); |
b411b363 | 1505 | |
db830c46 AG |
1506 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
1507 | drbd_set_in_sync(mdev, sector, peer_req->i.size); | |
99920dc5 | 1508 | err = drbd_send_ack(mdev, P_RS_WRITE_ACK, peer_req); |
b411b363 PR |
1509 | } else { |
1510 | /* Record failure to sync */ | |
db830c46 | 1511 | drbd_rs_failed_io(mdev, sector, peer_req->i.size); |
b411b363 | 1512 | |
99920dc5 | 1513 | err = drbd_send_ack(mdev, P_NEG_ACK, peer_req); |
b411b363 PR |
1514 | } |
1515 | dec_unacked(mdev); | |
1516 | ||
99920dc5 | 1517 | return err; |
b411b363 PR |
1518 | } |
1519 | ||
1520 | static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local) | |
1521 | { | |
db830c46 | 1522 | struct drbd_peer_request *peer_req; |
b411b363 | 1523 | |
db830c46 AG |
1524 | peer_req = read_in_block(mdev, ID_SYNCER, sector, data_size); |
1525 | if (!peer_req) | |
45bb912b | 1526 | goto fail; |
b411b363 PR |
1527 | |
1528 | dec_rs_pending(mdev); | |
1529 | ||
b411b363 PR |
1530 | inc_unacked(mdev); |
1531 | /* corresponding dec_unacked() in e_end_resync_block() | |
1532 | * respective _drbd_clear_done_ee */ | |
1533 | ||
db830c46 | 1534 | peer_req->w.cb = e_end_resync_block; |
45bb912b | 1535 | |
87eeee41 | 1536 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 | 1537 | list_add(&peer_req->w.list, &mdev->sync_ee); |
87eeee41 | 1538 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 1539 | |
0f0601f4 | 1540 | atomic_add(data_size >> 9, &mdev->rs_sect_ev); |
fbe29dec | 1541 | if (drbd_submit_peer_request(mdev, peer_req, WRITE, DRBD_FAULT_RS_WR) == 0) |
e1c1b0fc | 1542 | return 0; |
b411b363 | 1543 | |
10f6d992 LE |
1544 | /* don't care for the reason here */ |
1545 | dev_err(DEV, "submit failed, triggering re-connect\n"); | |
87eeee41 | 1546 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 | 1547 | list_del(&peer_req->w.list); |
87eeee41 | 1548 | spin_unlock_irq(&mdev->tconn->req_lock); |
22cc37a9 | 1549 | |
3967deb1 | 1550 | drbd_free_peer_req(mdev, peer_req); |
45bb912b LE |
1551 | fail: |
1552 | put_ldev(mdev); | |
e1c1b0fc | 1553 | return -EIO; |
b411b363 PR |
1554 | } |
1555 | ||
668eebc6 | 1556 | static struct drbd_request * |
bc9c5c41 AG |
1557 | find_request(struct drbd_conf *mdev, struct rb_root *root, u64 id, |
1558 | sector_t sector, bool missing_ok, const char *func) | |
51624585 | 1559 | { |
51624585 AG |
1560 | struct drbd_request *req; |
1561 | ||
bc9c5c41 AG |
1562 | /* Request object according to our peer */ |
1563 | req = (struct drbd_request *)(unsigned long)id; | |
5e472264 | 1564 | if (drbd_contains_interval(root, sector, &req->i) && req->i.local) |
668eebc6 | 1565 | return req; |
c3afd8f5 AG |
1566 | if (!missing_ok) { |
1567 | dev_err(DEV, "%s: failed to find request %lu, sector %llus\n", func, | |
1568 | (unsigned long)id, (unsigned long long)sector); | |
1569 | } | |
51624585 AG |
1570 | return NULL; |
1571 | } | |
1572 | ||
4a76b161 | 1573 | static int receive_DataReply(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 1574 | { |
4a76b161 | 1575 | struct drbd_conf *mdev; |
b411b363 PR |
1576 | struct drbd_request *req; |
1577 | sector_t sector; | |
82bc0194 | 1578 | int err; |
e658983a | 1579 | struct p_data *p = pi->data; |
4a76b161 AG |
1580 | |
1581 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
1582 | if (!mdev) | |
1583 | return -EIO; | |
b411b363 PR |
1584 | |
1585 | sector = be64_to_cpu(p->sector); | |
1586 | ||
87eeee41 | 1587 | spin_lock_irq(&mdev->tconn->req_lock); |
bc9c5c41 | 1588 | req = find_request(mdev, &mdev->read_requests, p->block_id, sector, false, __func__); |
87eeee41 | 1589 | spin_unlock_irq(&mdev->tconn->req_lock); |
c3afd8f5 | 1590 | if (unlikely(!req)) |
82bc0194 | 1591 | return -EIO; |
b411b363 | 1592 | |
24c4830c | 1593 | /* hlist_del(&req->collision) is done in _req_may_be_done, to avoid |
b411b363 PR |
1594 | * special casing it there for the various failure cases. |
1595 | * still no race with drbd_fail_pending_reads */ | |
e2857216 | 1596 | err = recv_dless_read(mdev, req, sector, pi->size); |
82bc0194 | 1597 | if (!err) |
8554df1c | 1598 | req_mod(req, DATA_RECEIVED); |
b411b363 PR |
1599 | /* else: nothing. handled from drbd_disconnect... |
1600 | * I don't think we may complete this just yet | |
1601 | * in case we are "on-disconnect: freeze" */ | |
1602 | ||
82bc0194 | 1603 | return err; |
b411b363 PR |
1604 | } |
1605 | ||
4a76b161 | 1606 | static int receive_RSDataReply(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 1607 | { |
4a76b161 | 1608 | struct drbd_conf *mdev; |
b411b363 | 1609 | sector_t sector; |
82bc0194 | 1610 | int err; |
e658983a | 1611 | struct p_data *p = pi->data; |
4a76b161 AG |
1612 | |
1613 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
1614 | if (!mdev) | |
1615 | return -EIO; | |
b411b363 PR |
1616 | |
1617 | sector = be64_to_cpu(p->sector); | |
1618 | D_ASSERT(p->block_id == ID_SYNCER); | |
1619 | ||
1620 | if (get_ldev(mdev)) { | |
1621 | /* data is submitted to disk within recv_resync_read. | |
1622 | * corresponding put_ldev done below on error, | |
fcefa62e | 1623 | * or in drbd_peer_request_endio. */ |
e2857216 | 1624 | err = recv_resync_read(mdev, sector, pi->size); |
b411b363 PR |
1625 | } else { |
1626 | if (__ratelimit(&drbd_ratelimit_state)) | |
1627 | dev_err(DEV, "Can not write resync data to local disk.\n"); | |
1628 | ||
e2857216 | 1629 | err = drbd_drain_block(mdev, pi->size); |
b411b363 | 1630 | |
e2857216 | 1631 | drbd_send_ack_dp(mdev, P_NEG_ACK, p, pi->size); |
b411b363 PR |
1632 | } |
1633 | ||
e2857216 | 1634 | atomic_add(pi->size >> 9, &mdev->rs_sect_in); |
778f271d | 1635 | |
82bc0194 | 1636 | return err; |
b411b363 PR |
1637 | } |
1638 | ||
99920dc5 | 1639 | static int w_restart_write(struct drbd_work *w, int cancel) |
7be8da07 AG |
1640 | { |
1641 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
1642 | struct drbd_conf *mdev = w->mdev; | |
1643 | struct bio *bio; | |
1644 | unsigned long start_time; | |
1645 | unsigned long flags; | |
1646 | ||
1647 | spin_lock_irqsave(&mdev->tconn->req_lock, flags); | |
1648 | if (!expect(req->rq_state & RQ_POSTPONED)) { | |
1649 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); | |
99920dc5 | 1650 | return -EIO; |
7be8da07 AG |
1651 | } |
1652 | bio = req->master_bio; | |
1653 | start_time = req->start_time; | |
1654 | /* Postponed requests will not have their master_bio completed! */ | |
1655 | __req_mod(req, DISCARD_WRITE, NULL); | |
1656 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); | |
1657 | ||
1658 | while (__drbd_make_request(mdev, bio, start_time)) | |
1659 | /* retry */ ; | |
99920dc5 | 1660 | return 0; |
7be8da07 AG |
1661 | } |
1662 | ||
1663 | static void restart_conflicting_writes(struct drbd_conf *mdev, | |
1664 | sector_t sector, int size) | |
1665 | { | |
1666 | struct drbd_interval *i; | |
1667 | struct drbd_request *req; | |
1668 | ||
1669 | drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { | |
1670 | if (!i->local) | |
1671 | continue; | |
1672 | req = container_of(i, struct drbd_request, i); | |
1673 | if (req->rq_state & RQ_LOCAL_PENDING || | |
1674 | !(req->rq_state & RQ_POSTPONED)) | |
1675 | continue; | |
1676 | if (expect(list_empty(&req->w.list))) { | |
1677 | req->w.mdev = mdev; | |
1678 | req->w.cb = w_restart_write; | |
1679 | drbd_queue_work(&mdev->tconn->data.work, &req->w); | |
1680 | } | |
1681 | } | |
1682 | } | |
1683 | ||
a990be46 AG |
1684 | /* |
1685 | * e_end_block() is called in asender context via drbd_finish_peer_reqs(). | |
b411b363 | 1686 | */ |
99920dc5 | 1687 | static int e_end_block(struct drbd_work *w, int cancel) |
b411b363 | 1688 | { |
8050e6d0 AG |
1689 | struct drbd_peer_request *peer_req = |
1690 | container_of(w, struct drbd_peer_request, w); | |
00d56944 | 1691 | struct drbd_conf *mdev = w->mdev; |
db830c46 | 1692 | sector_t sector = peer_req->i.sector; |
99920dc5 | 1693 | int err = 0, pcmd; |
b411b363 | 1694 | |
89e58e75 | 1695 | if (mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C) { |
db830c46 | 1696 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
1697 | pcmd = (mdev->state.conn >= C_SYNC_SOURCE && |
1698 | mdev->state.conn <= C_PAUSED_SYNC_T && | |
db830c46 | 1699 | peer_req->flags & EE_MAY_SET_IN_SYNC) ? |
b411b363 | 1700 | P_RS_WRITE_ACK : P_WRITE_ACK; |
99920dc5 | 1701 | err = drbd_send_ack(mdev, pcmd, peer_req); |
b411b363 | 1702 | if (pcmd == P_RS_WRITE_ACK) |
db830c46 | 1703 | drbd_set_in_sync(mdev, sector, peer_req->i.size); |
b411b363 | 1704 | } else { |
99920dc5 | 1705 | err = drbd_send_ack(mdev, P_NEG_ACK, peer_req); |
b411b363 PR |
1706 | /* we expect it to be marked out of sync anyways... |
1707 | * maybe assert this? */ | |
1708 | } | |
1709 | dec_unacked(mdev); | |
1710 | } | |
1711 | /* we delete from the conflict detection hash _after_ we sent out the | |
1712 | * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ | |
89e58e75 | 1713 | if (mdev->tconn->net_conf->two_primaries) { |
87eeee41 | 1714 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 AG |
1715 | D_ASSERT(!drbd_interval_empty(&peer_req->i)); |
1716 | drbd_remove_epoch_entry_interval(mdev, peer_req); | |
7be8da07 AG |
1717 | if (peer_req->flags & EE_RESTART_REQUESTS) |
1718 | restart_conflicting_writes(mdev, sector, peer_req->i.size); | |
87eeee41 | 1719 | spin_unlock_irq(&mdev->tconn->req_lock); |
bb3bfe96 | 1720 | } else |
db830c46 | 1721 | D_ASSERT(drbd_interval_empty(&peer_req->i)); |
b411b363 | 1722 | |
db830c46 | 1723 | drbd_may_finish_epoch(mdev, peer_req->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); |
b411b363 | 1724 | |
99920dc5 | 1725 | return err; |
b411b363 PR |
1726 | } |
1727 | ||
7be8da07 | 1728 | static int e_send_ack(struct drbd_work *w, enum drbd_packet ack) |
b411b363 | 1729 | { |
7be8da07 | 1730 | struct drbd_conf *mdev = w->mdev; |
8050e6d0 AG |
1731 | struct drbd_peer_request *peer_req = |
1732 | container_of(w, struct drbd_peer_request, w); | |
99920dc5 | 1733 | int err; |
b411b363 | 1734 | |
99920dc5 | 1735 | err = drbd_send_ack(mdev, ack, peer_req); |
b411b363 PR |
1736 | dec_unacked(mdev); |
1737 | ||
99920dc5 | 1738 | return err; |
b411b363 PR |
1739 | } |
1740 | ||
99920dc5 | 1741 | static int e_send_discard_write(struct drbd_work *w, int unused) |
7be8da07 AG |
1742 | { |
1743 | return e_send_ack(w, P_DISCARD_WRITE); | |
1744 | } | |
1745 | ||
99920dc5 | 1746 | static int e_send_retry_write(struct drbd_work *w, int unused) |
7be8da07 AG |
1747 | { |
1748 | struct drbd_tconn *tconn = w->mdev->tconn; | |
1749 | ||
1750 | return e_send_ack(w, tconn->agreed_pro_version >= 100 ? | |
1751 | P_RETRY_WRITE : P_DISCARD_WRITE); | |
1752 | } | |
1753 | ||
3e394da1 AG |
1754 | static bool seq_greater(u32 a, u32 b) |
1755 | { | |
1756 | /* | |
1757 | * We assume 32-bit wrap-around here. | |
1758 | * For 24-bit wrap-around, we would have to shift: | |
1759 | * a <<= 8; b <<= 8; | |
1760 | */ | |
1761 | return (s32)a - (s32)b > 0; | |
1762 | } | |
1763 | ||
1764 | static u32 seq_max(u32 a, u32 b) | |
1765 | { | |
1766 | return seq_greater(a, b) ? a : b; | |
1767 | } | |
1768 | ||
7be8da07 AG |
1769 | static bool need_peer_seq(struct drbd_conf *mdev) |
1770 | { | |
1771 | struct drbd_tconn *tconn = mdev->tconn; | |
1772 | ||
1773 | /* | |
1774 | * We only need to keep track of the last packet_seq number of our peer | |
1775 | * if we are in dual-primary mode and we have the discard flag set; see | |
1776 | * handle_write_conflicts(). | |
1777 | */ | |
1778 | return tconn->net_conf->two_primaries && | |
1779 | test_bit(DISCARD_CONCURRENT, &tconn->flags); | |
1780 | } | |
1781 | ||
43ae077d | 1782 | static void update_peer_seq(struct drbd_conf *mdev, unsigned int peer_seq) |
3e394da1 | 1783 | { |
3c13b680 | 1784 | unsigned int newest_peer_seq; |
3e394da1 | 1785 | |
7be8da07 AG |
1786 | if (need_peer_seq(mdev)) { |
1787 | spin_lock(&mdev->peer_seq_lock); | |
3c13b680 LE |
1788 | newest_peer_seq = seq_max(mdev->peer_seq, peer_seq); |
1789 | mdev->peer_seq = newest_peer_seq; | |
7be8da07 | 1790 | spin_unlock(&mdev->peer_seq_lock); |
3c13b680 LE |
1791 | /* wake up only if we actually changed mdev->peer_seq */ |
1792 | if (peer_seq == newest_peer_seq) | |
7be8da07 AG |
1793 | wake_up(&mdev->seq_wait); |
1794 | } | |
3e394da1 AG |
1795 | } |
1796 | ||
b411b363 PR |
1797 | /* Called from receive_Data. |
1798 | * Synchronize packets on sock with packets on msock. | |
1799 | * | |
1800 | * This is here so even when a P_DATA packet traveling via sock overtook an Ack | |
1801 | * packet traveling on msock, they are still processed in the order they have | |
1802 | * been sent. | |
1803 | * | |
1804 | * Note: we don't care for Ack packets overtaking P_DATA packets. | |
1805 | * | |
1806 | * In case packet_seq is larger than mdev->peer_seq number, there are | |
1807 | * outstanding packets on the msock. We wait for them to arrive. | |
1808 | * In case we are the logically next packet, we update mdev->peer_seq | |
1809 | * ourselves. Correctly handles 32bit wrap around. | |
1810 | * | |
1811 | * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, | |
1812 | * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds | |
1813 | * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have | |
1814 | * 1<<9 == 512 seconds aka ages for the 32bit wrap around... | |
1815 | * | |
1816 | * returns 0 if we may process the packet, | |
1817 | * -ERESTARTSYS if we were interrupted (by disconnect signal). */ | |
7be8da07 | 1818 | static int wait_for_and_update_peer_seq(struct drbd_conf *mdev, const u32 peer_seq) |
b411b363 PR |
1819 | { |
1820 | DEFINE_WAIT(wait); | |
b411b363 | 1821 | long timeout; |
7be8da07 AG |
1822 | int ret; |
1823 | ||
1824 | if (!need_peer_seq(mdev)) | |
1825 | return 0; | |
1826 | ||
b411b363 PR |
1827 | spin_lock(&mdev->peer_seq_lock); |
1828 | for (;;) { | |
7be8da07 AG |
1829 | if (!seq_greater(peer_seq - 1, mdev->peer_seq)) { |
1830 | mdev->peer_seq = seq_max(mdev->peer_seq, peer_seq); | |
1831 | ret = 0; | |
b411b363 | 1832 | break; |
7be8da07 | 1833 | } |
b411b363 PR |
1834 | if (signal_pending(current)) { |
1835 | ret = -ERESTARTSYS; | |
1836 | break; | |
1837 | } | |
7be8da07 | 1838 | prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE); |
b411b363 | 1839 | spin_unlock(&mdev->peer_seq_lock); |
71b1c1eb AG |
1840 | timeout = mdev->tconn->net_conf->ping_timeo*HZ/10; |
1841 | timeout = schedule_timeout(timeout); | |
b411b363 | 1842 | spin_lock(&mdev->peer_seq_lock); |
7be8da07 | 1843 | if (!timeout) { |
b411b363 | 1844 | ret = -ETIMEDOUT; |
71b1c1eb | 1845 | dev_err(DEV, "Timed out waiting for missing ack packets; disconnecting\n"); |
b411b363 PR |
1846 | break; |
1847 | } | |
1848 | } | |
b411b363 | 1849 | spin_unlock(&mdev->peer_seq_lock); |
7be8da07 | 1850 | finish_wait(&mdev->seq_wait, &wait); |
b411b363 PR |
1851 | return ret; |
1852 | } | |
1853 | ||
688593c5 LE |
1854 | /* see also bio_flags_to_wire() |
1855 | * DRBD_REQ_*, because we need to semantically map the flags to data packet | |
1856 | * flags and back. We may replicate to other kernel versions. */ | |
1857 | static unsigned long wire_flags_to_bio(struct drbd_conf *mdev, u32 dpf) | |
76d2e7ec | 1858 | { |
688593c5 LE |
1859 | return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | |
1860 | (dpf & DP_FUA ? REQ_FUA : 0) | | |
1861 | (dpf & DP_FLUSH ? REQ_FLUSH : 0) | | |
1862 | (dpf & DP_DISCARD ? REQ_DISCARD : 0); | |
76d2e7ec PR |
1863 | } |
1864 | ||
7be8da07 AG |
1865 | static void fail_postponed_requests(struct drbd_conf *mdev, sector_t sector, |
1866 | unsigned int size) | |
1867 | { | |
1868 | struct drbd_interval *i; | |
1869 | ||
1870 | repeat: | |
1871 | drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { | |
1872 | struct drbd_request *req; | |
1873 | struct bio_and_error m; | |
1874 | ||
1875 | if (!i->local) | |
1876 | continue; | |
1877 | req = container_of(i, struct drbd_request, i); | |
1878 | if (!(req->rq_state & RQ_POSTPONED)) | |
1879 | continue; | |
1880 | req->rq_state &= ~RQ_POSTPONED; | |
1881 | __req_mod(req, NEG_ACKED, &m); | |
1882 | spin_unlock_irq(&mdev->tconn->req_lock); | |
1883 | if (m.bio) | |
1884 | complete_master_bio(mdev, &m); | |
1885 | spin_lock_irq(&mdev->tconn->req_lock); | |
1886 | goto repeat; | |
1887 | } | |
1888 | } | |
1889 | ||
1890 | static int handle_write_conflicts(struct drbd_conf *mdev, | |
1891 | struct drbd_peer_request *peer_req) | |
1892 | { | |
1893 | struct drbd_tconn *tconn = mdev->tconn; | |
1894 | bool resolve_conflicts = test_bit(DISCARD_CONCURRENT, &tconn->flags); | |
1895 | sector_t sector = peer_req->i.sector; | |
1896 | const unsigned int size = peer_req->i.size; | |
1897 | struct drbd_interval *i; | |
1898 | bool equal; | |
1899 | int err; | |
1900 | ||
1901 | /* | |
1902 | * Inserting the peer request into the write_requests tree will prevent | |
1903 | * new conflicting local requests from being added. | |
1904 | */ | |
1905 | drbd_insert_interval(&mdev->write_requests, &peer_req->i); | |
1906 | ||
1907 | repeat: | |
1908 | drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { | |
1909 | if (i == &peer_req->i) | |
1910 | continue; | |
1911 | ||
1912 | if (!i->local) { | |
1913 | /* | |
1914 | * Our peer has sent a conflicting remote request; this | |
1915 | * should not happen in a two-node setup. Wait for the | |
1916 | * earlier peer request to complete. | |
1917 | */ | |
1918 | err = drbd_wait_misc(mdev, i); | |
1919 | if (err) | |
1920 | goto out; | |
1921 | goto repeat; | |
1922 | } | |
1923 | ||
1924 | equal = i->sector == sector && i->size == size; | |
1925 | if (resolve_conflicts) { | |
1926 | /* | |
1927 | * If the peer request is fully contained within the | |
1928 | * overlapping request, it can be discarded; otherwise, | |
1929 | * it will be retried once all overlapping requests | |
1930 | * have completed. | |
1931 | */ | |
1932 | bool discard = i->sector <= sector && i->sector + | |
1933 | (i->size >> 9) >= sector + (size >> 9); | |
1934 | ||
1935 | if (!equal) | |
1936 | dev_alert(DEV, "Concurrent writes detected: " | |
1937 | "local=%llus +%u, remote=%llus +%u, " | |
1938 | "assuming %s came first\n", | |
1939 | (unsigned long long)i->sector, i->size, | |
1940 | (unsigned long long)sector, size, | |
1941 | discard ? "local" : "remote"); | |
1942 | ||
1943 | inc_unacked(mdev); | |
1944 | peer_req->w.cb = discard ? e_send_discard_write : | |
1945 | e_send_retry_write; | |
1946 | list_add_tail(&peer_req->w.list, &mdev->done_ee); | |
1947 | wake_asender(mdev->tconn); | |
1948 | ||
1949 | err = -ENOENT; | |
1950 | goto out; | |
1951 | } else { | |
1952 | struct drbd_request *req = | |
1953 | container_of(i, struct drbd_request, i); | |
1954 | ||
1955 | if (!equal) | |
1956 | dev_alert(DEV, "Concurrent writes detected: " | |
1957 | "local=%llus +%u, remote=%llus +%u\n", | |
1958 | (unsigned long long)i->sector, i->size, | |
1959 | (unsigned long long)sector, size); | |
1960 | ||
1961 | if (req->rq_state & RQ_LOCAL_PENDING || | |
1962 | !(req->rq_state & RQ_POSTPONED)) { | |
1963 | /* | |
1964 | * Wait for the node with the discard flag to | |
1965 | * decide if this request will be discarded or | |
1966 | * retried. Requests that are discarded will | |
1967 | * disappear from the write_requests tree. | |
1968 | * | |
1969 | * In addition, wait for the conflicting | |
1970 | * request to finish locally before submitting | |
1971 | * the conflicting peer request. | |
1972 | */ | |
1973 | err = drbd_wait_misc(mdev, &req->i); | |
1974 | if (err) { | |
1975 | _conn_request_state(mdev->tconn, | |
1976 | NS(conn, C_TIMEOUT), | |
1977 | CS_HARD); | |
1978 | fail_postponed_requests(mdev, sector, size); | |
1979 | goto out; | |
1980 | } | |
1981 | goto repeat; | |
1982 | } | |
1983 | /* | |
1984 | * Remember to restart the conflicting requests after | |
1985 | * the new peer request has completed. | |
1986 | */ | |
1987 | peer_req->flags |= EE_RESTART_REQUESTS; | |
1988 | } | |
1989 | } | |
1990 | err = 0; | |
1991 | ||
1992 | out: | |
1993 | if (err) | |
1994 | drbd_remove_epoch_entry_interval(mdev, peer_req); | |
1995 | return err; | |
1996 | } | |
1997 | ||
b411b363 | 1998 | /* mirrored write */ |
4a76b161 | 1999 | static int receive_Data(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 2000 | { |
4a76b161 | 2001 | struct drbd_conf *mdev; |
b411b363 | 2002 | sector_t sector; |
db830c46 | 2003 | struct drbd_peer_request *peer_req; |
e658983a | 2004 | struct p_data *p = pi->data; |
7be8da07 | 2005 | u32 peer_seq = be32_to_cpu(p->seq_num); |
b411b363 PR |
2006 | int rw = WRITE; |
2007 | u32 dp_flags; | |
7be8da07 | 2008 | int err; |
b411b363 | 2009 | |
4a76b161 AG |
2010 | mdev = vnr_to_mdev(tconn, pi->vnr); |
2011 | if (!mdev) | |
2012 | return -EIO; | |
2013 | ||
7be8da07 | 2014 | if (!get_ldev(mdev)) { |
82bc0194 AG |
2015 | int err2; |
2016 | ||
7be8da07 | 2017 | err = wait_for_and_update_peer_seq(mdev, peer_seq); |
e2857216 | 2018 | drbd_send_ack_dp(mdev, P_NEG_ACK, p, pi->size); |
b411b363 | 2019 | atomic_inc(&mdev->current_epoch->epoch_size); |
e2857216 | 2020 | err2 = drbd_drain_block(mdev, pi->size); |
82bc0194 AG |
2021 | if (!err) |
2022 | err = err2; | |
2023 | return err; | |
b411b363 PR |
2024 | } |
2025 | ||
fcefa62e AG |
2026 | /* |
2027 | * Corresponding put_ldev done either below (on various errors), or in | |
2028 | * drbd_peer_request_endio, if we successfully submit the data at the | |
2029 | * end of this function. | |
2030 | */ | |
b411b363 PR |
2031 | |
2032 | sector = be64_to_cpu(p->sector); | |
e2857216 | 2033 | peer_req = read_in_block(mdev, p->block_id, sector, pi->size); |
db830c46 | 2034 | if (!peer_req) { |
b411b363 | 2035 | put_ldev(mdev); |
82bc0194 | 2036 | return -EIO; |
b411b363 PR |
2037 | } |
2038 | ||
db830c46 | 2039 | peer_req->w.cb = e_end_block; |
b411b363 | 2040 | |
688593c5 LE |
2041 | dp_flags = be32_to_cpu(p->dp_flags); |
2042 | rw |= wire_flags_to_bio(mdev, dp_flags); | |
2043 | ||
2044 | if (dp_flags & DP_MAY_SET_IN_SYNC) | |
db830c46 | 2045 | peer_req->flags |= EE_MAY_SET_IN_SYNC; |
688593c5 | 2046 | |
b411b363 | 2047 | spin_lock(&mdev->epoch_lock); |
db830c46 AG |
2048 | peer_req->epoch = mdev->current_epoch; |
2049 | atomic_inc(&peer_req->epoch->epoch_size); | |
2050 | atomic_inc(&peer_req->epoch->active); | |
b411b363 PR |
2051 | spin_unlock(&mdev->epoch_lock); |
2052 | ||
7be8da07 AG |
2053 | if (mdev->tconn->net_conf->two_primaries) { |
2054 | err = wait_for_and_update_peer_seq(mdev, peer_seq); | |
2055 | if (err) | |
b411b363 | 2056 | goto out_interrupted; |
87eeee41 | 2057 | spin_lock_irq(&mdev->tconn->req_lock); |
7be8da07 AG |
2058 | err = handle_write_conflicts(mdev, peer_req); |
2059 | if (err) { | |
2060 | spin_unlock_irq(&mdev->tconn->req_lock); | |
2061 | if (err == -ENOENT) { | |
b411b363 | 2062 | put_ldev(mdev); |
82bc0194 | 2063 | return 0; |
b411b363 | 2064 | } |
7be8da07 | 2065 | goto out_interrupted; |
b411b363 | 2066 | } |
7be8da07 AG |
2067 | } else |
2068 | spin_lock_irq(&mdev->tconn->req_lock); | |
db830c46 | 2069 | list_add(&peer_req->w.list, &mdev->active_ee); |
87eeee41 | 2070 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 2071 | |
89e58e75 | 2072 | switch (mdev->tconn->net_conf->wire_protocol) { |
b411b363 PR |
2073 | case DRBD_PROT_C: |
2074 | inc_unacked(mdev); | |
2075 | /* corresponding dec_unacked() in e_end_block() | |
2076 | * respective _drbd_clear_done_ee */ | |
2077 | break; | |
2078 | case DRBD_PROT_B: | |
2079 | /* I really don't like it that the receiver thread | |
2080 | * sends on the msock, but anyways */ | |
db830c46 | 2081 | drbd_send_ack(mdev, P_RECV_ACK, peer_req); |
b411b363 PR |
2082 | break; |
2083 | case DRBD_PROT_A: | |
2084 | /* nothing to do */ | |
2085 | break; | |
2086 | } | |
2087 | ||
6719fb03 | 2088 | if (mdev->state.pdsk < D_INCONSISTENT) { |
b411b363 | 2089 | /* In case we have the only disk of the cluster, */ |
db830c46 AG |
2090 | drbd_set_out_of_sync(mdev, peer_req->i.sector, peer_req->i.size); |
2091 | peer_req->flags |= EE_CALL_AL_COMPLETE_IO; | |
2092 | peer_req->flags &= ~EE_MAY_SET_IN_SYNC; | |
181286ad | 2093 | drbd_al_begin_io(mdev, &peer_req->i); |
b411b363 PR |
2094 | } |
2095 | ||
82bc0194 AG |
2096 | err = drbd_submit_peer_request(mdev, peer_req, rw, DRBD_FAULT_DT_WR); |
2097 | if (!err) | |
2098 | return 0; | |
b411b363 | 2099 | |
10f6d992 LE |
2100 | /* don't care for the reason here */ |
2101 | dev_err(DEV, "submit failed, triggering re-connect\n"); | |
87eeee41 | 2102 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 AG |
2103 | list_del(&peer_req->w.list); |
2104 | drbd_remove_epoch_entry_interval(mdev, peer_req); | |
87eeee41 | 2105 | spin_unlock_irq(&mdev->tconn->req_lock); |
db830c46 | 2106 | if (peer_req->flags & EE_CALL_AL_COMPLETE_IO) |
181286ad | 2107 | drbd_al_complete_io(mdev, &peer_req->i); |
22cc37a9 | 2108 | |
b411b363 | 2109 | out_interrupted: |
db830c46 | 2110 | drbd_may_finish_epoch(mdev, peer_req->epoch, EV_PUT + EV_CLEANUP); |
b411b363 | 2111 | put_ldev(mdev); |
3967deb1 | 2112 | drbd_free_peer_req(mdev, peer_req); |
82bc0194 | 2113 | return err; |
b411b363 PR |
2114 | } |
2115 | ||
0f0601f4 LE |
2116 | /* We may throttle resync, if the lower device seems to be busy, |
2117 | * and current sync rate is above c_min_rate. | |
2118 | * | |
2119 | * To decide whether or not the lower device is busy, we use a scheme similar | |
2120 | * to MD RAID is_mddev_idle(): if the partition stats reveal "significant" | |
2121 | * (more than 64 sectors) of activity we cannot account for with our own resync | |
2122 | * activity, it obviously is "busy". | |
2123 | * | |
2124 | * The current sync rate used here uses only the most recent two step marks, | |
2125 | * to have a short time average so we can react faster. | |
2126 | */ | |
e3555d85 | 2127 | int drbd_rs_should_slow_down(struct drbd_conf *mdev, sector_t sector) |
0f0601f4 LE |
2128 | { |
2129 | struct gendisk *disk = mdev->ldev->backing_bdev->bd_contains->bd_disk; | |
2130 | unsigned long db, dt, dbdt; | |
e3555d85 | 2131 | struct lc_element *tmp; |
0f0601f4 LE |
2132 | int curr_events; |
2133 | int throttle = 0; | |
2134 | ||
2135 | /* feature disabled? */ | |
f399002e | 2136 | if (mdev->ldev->dc.c_min_rate == 0) |
0f0601f4 LE |
2137 | return 0; |
2138 | ||
e3555d85 PR |
2139 | spin_lock_irq(&mdev->al_lock); |
2140 | tmp = lc_find(mdev->resync, BM_SECT_TO_EXT(sector)); | |
2141 | if (tmp) { | |
2142 | struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); | |
2143 | if (test_bit(BME_PRIORITY, &bm_ext->flags)) { | |
2144 | spin_unlock_irq(&mdev->al_lock); | |
2145 | return 0; | |
2146 | } | |
2147 | /* Do not slow down if app IO is already waiting for this extent */ | |
2148 | } | |
2149 | spin_unlock_irq(&mdev->al_lock); | |
2150 | ||
0f0601f4 LE |
2151 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
2152 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
2153 | atomic_read(&mdev->rs_sect_ev); | |
e3555d85 | 2154 | |
0f0601f4 LE |
2155 | if (!mdev->rs_last_events || curr_events - mdev->rs_last_events > 64) { |
2156 | unsigned long rs_left; | |
2157 | int i; | |
2158 | ||
2159 | mdev->rs_last_events = curr_events; | |
2160 | ||
2161 | /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, | |
2162 | * approx. */ | |
2649f080 LE |
2163 | i = (mdev->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; |
2164 | ||
2165 | if (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T) | |
2166 | rs_left = mdev->ov_left; | |
2167 | else | |
2168 | rs_left = drbd_bm_total_weight(mdev) - mdev->rs_failed; | |
0f0601f4 LE |
2169 | |
2170 | dt = ((long)jiffies - (long)mdev->rs_mark_time[i]) / HZ; | |
2171 | if (!dt) | |
2172 | dt++; | |
2173 | db = mdev->rs_mark_left[i] - rs_left; | |
2174 | dbdt = Bit2KB(db/dt); | |
2175 | ||
f399002e | 2176 | if (dbdt > mdev->ldev->dc.c_min_rate) |
0f0601f4 LE |
2177 | throttle = 1; |
2178 | } | |
2179 | return throttle; | |
2180 | } | |
2181 | ||
2182 | ||
4a76b161 | 2183 | static int receive_DataRequest(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 2184 | { |
4a76b161 | 2185 | struct drbd_conf *mdev; |
b411b363 | 2186 | sector_t sector; |
4a76b161 | 2187 | sector_t capacity; |
db830c46 | 2188 | struct drbd_peer_request *peer_req; |
b411b363 | 2189 | struct digest_info *di = NULL; |
b18b37be | 2190 | int size, verb; |
b411b363 | 2191 | unsigned int fault_type; |
e658983a | 2192 | struct p_block_req *p = pi->data; |
4a76b161 AG |
2193 | |
2194 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
2195 | if (!mdev) | |
2196 | return -EIO; | |
2197 | capacity = drbd_get_capacity(mdev->this_bdev); | |
b411b363 PR |
2198 | |
2199 | sector = be64_to_cpu(p->sector); | |
2200 | size = be32_to_cpu(p->blksize); | |
2201 | ||
c670a398 | 2202 | if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) { |
b411b363 PR |
2203 | dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, |
2204 | (unsigned long long)sector, size); | |
82bc0194 | 2205 | return -EINVAL; |
b411b363 PR |
2206 | } |
2207 | if (sector + (size>>9) > capacity) { | |
2208 | dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, | |
2209 | (unsigned long long)sector, size); | |
82bc0194 | 2210 | return -EINVAL; |
b411b363 PR |
2211 | } |
2212 | ||
2213 | if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) { | |
b18b37be | 2214 | verb = 1; |
e2857216 | 2215 | switch (pi->cmd) { |
b18b37be PR |
2216 | case P_DATA_REQUEST: |
2217 | drbd_send_ack_rp(mdev, P_NEG_DREPLY, p); | |
2218 | break; | |
2219 | case P_RS_DATA_REQUEST: | |
2220 | case P_CSUM_RS_REQUEST: | |
2221 | case P_OV_REQUEST: | |
2222 | drbd_send_ack_rp(mdev, P_NEG_RS_DREPLY , p); | |
2223 | break; | |
2224 | case P_OV_REPLY: | |
2225 | verb = 0; | |
2226 | dec_rs_pending(mdev); | |
2227 | drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, ID_IN_SYNC); | |
2228 | break; | |
2229 | default: | |
49ba9b1b | 2230 | BUG(); |
b18b37be PR |
2231 | } |
2232 | if (verb && __ratelimit(&drbd_ratelimit_state)) | |
b411b363 PR |
2233 | dev_err(DEV, "Can not satisfy peer's read request, " |
2234 | "no local data.\n"); | |
b18b37be | 2235 | |
a821cc4a | 2236 | /* drain possibly payload */ |
e2857216 | 2237 | return drbd_drain_block(mdev, pi->size); |
b411b363 PR |
2238 | } |
2239 | ||
2240 | /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD | |
2241 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
2242 | * which in turn might block on the other node at this very place. */ | |
0db55363 | 2243 | peer_req = drbd_alloc_peer_req(mdev, p->block_id, sector, size, GFP_NOIO); |
db830c46 | 2244 | if (!peer_req) { |
b411b363 | 2245 | put_ldev(mdev); |
82bc0194 | 2246 | return -ENOMEM; |
b411b363 PR |
2247 | } |
2248 | ||
e2857216 | 2249 | switch (pi->cmd) { |
b411b363 | 2250 | case P_DATA_REQUEST: |
db830c46 | 2251 | peer_req->w.cb = w_e_end_data_req; |
b411b363 | 2252 | fault_type = DRBD_FAULT_DT_RD; |
80a40e43 LE |
2253 | /* application IO, don't drbd_rs_begin_io */ |
2254 | goto submit; | |
2255 | ||
b411b363 | 2256 | case P_RS_DATA_REQUEST: |
db830c46 | 2257 | peer_req->w.cb = w_e_end_rsdata_req; |
b411b363 | 2258 | fault_type = DRBD_FAULT_RS_RD; |
5f9915bb LE |
2259 | /* used in the sector offset progress display */ |
2260 | mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); | |
b411b363 PR |
2261 | break; |
2262 | ||
2263 | case P_OV_REPLY: | |
2264 | case P_CSUM_RS_REQUEST: | |
2265 | fault_type = DRBD_FAULT_RS_RD; | |
e2857216 | 2266 | di = kmalloc(sizeof(*di) + pi->size, GFP_NOIO); |
b411b363 PR |
2267 | if (!di) |
2268 | goto out_free_e; | |
2269 | ||
e2857216 | 2270 | di->digest_size = pi->size; |
b411b363 PR |
2271 | di->digest = (((char *)di)+sizeof(struct digest_info)); |
2272 | ||
db830c46 AG |
2273 | peer_req->digest = di; |
2274 | peer_req->flags |= EE_HAS_DIGEST; | |
c36c3ced | 2275 | |
e2857216 | 2276 | if (drbd_recv_all(mdev->tconn, di->digest, pi->size)) |
b411b363 PR |
2277 | goto out_free_e; |
2278 | ||
e2857216 | 2279 | if (pi->cmd == P_CSUM_RS_REQUEST) { |
31890f4a | 2280 | D_ASSERT(mdev->tconn->agreed_pro_version >= 89); |
db830c46 | 2281 | peer_req->w.cb = w_e_end_csum_rs_req; |
5f9915bb LE |
2282 | /* used in the sector offset progress display */ |
2283 | mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); | |
e2857216 | 2284 | } else if (pi->cmd == P_OV_REPLY) { |
2649f080 LE |
2285 | /* track progress, we may need to throttle */ |
2286 | atomic_add(size >> 9, &mdev->rs_sect_in); | |
db830c46 | 2287 | peer_req->w.cb = w_e_end_ov_reply; |
b411b363 | 2288 | dec_rs_pending(mdev); |
0f0601f4 LE |
2289 | /* drbd_rs_begin_io done when we sent this request, |
2290 | * but accounting still needs to be done. */ | |
2291 | goto submit_for_resync; | |
b411b363 PR |
2292 | } |
2293 | break; | |
2294 | ||
2295 | case P_OV_REQUEST: | |
b411b363 | 2296 | if (mdev->ov_start_sector == ~(sector_t)0 && |
31890f4a | 2297 | mdev->tconn->agreed_pro_version >= 90) { |
de228bba LE |
2298 | unsigned long now = jiffies; |
2299 | int i; | |
b411b363 PR |
2300 | mdev->ov_start_sector = sector; |
2301 | mdev->ov_position = sector; | |
30b743a2 LE |
2302 | mdev->ov_left = drbd_bm_bits(mdev) - BM_SECT_TO_BIT(sector); |
2303 | mdev->rs_total = mdev->ov_left; | |
de228bba LE |
2304 | for (i = 0; i < DRBD_SYNC_MARKS; i++) { |
2305 | mdev->rs_mark_left[i] = mdev->ov_left; | |
2306 | mdev->rs_mark_time[i] = now; | |
2307 | } | |
b411b363 PR |
2308 | dev_info(DEV, "Online Verify start sector: %llu\n", |
2309 | (unsigned long long)sector); | |
2310 | } | |
db830c46 | 2311 | peer_req->w.cb = w_e_end_ov_req; |
b411b363 | 2312 | fault_type = DRBD_FAULT_RS_RD; |
b411b363 PR |
2313 | break; |
2314 | ||
b411b363 | 2315 | default: |
49ba9b1b | 2316 | BUG(); |
b411b363 PR |
2317 | } |
2318 | ||
0f0601f4 LE |
2319 | /* Throttle, drbd_rs_begin_io and submit should become asynchronous |
2320 | * wrt the receiver, but it is not as straightforward as it may seem. | |
2321 | * Various places in the resync start and stop logic assume resync | |
2322 | * requests are processed in order, requeuing this on the worker thread | |
2323 | * introduces a bunch of new code for synchronization between threads. | |
2324 | * | |
2325 | * Unlimited throttling before drbd_rs_begin_io may stall the resync | |
2326 | * "forever", throttling after drbd_rs_begin_io will lock that extent | |
2327 | * for application writes for the same time. For now, just throttle | |
2328 | * here, where the rest of the code expects the receiver to sleep for | |
2329 | * a while, anyways. | |
2330 | */ | |
2331 | ||
2332 | /* Throttle before drbd_rs_begin_io, as that locks out application IO; | |
2333 | * this defers syncer requests for some time, before letting at least | |
2334 | * on request through. The resync controller on the receiving side | |
2335 | * will adapt to the incoming rate accordingly. | |
2336 | * | |
2337 | * We cannot throttle here if remote is Primary/SyncTarget: | |
2338 | * we would also throttle its application reads. | |
2339 | * In that case, throttling is done on the SyncTarget only. | |
2340 | */ | |
e3555d85 PR |
2341 | if (mdev->state.peer != R_PRIMARY && drbd_rs_should_slow_down(mdev, sector)) |
2342 | schedule_timeout_uninterruptible(HZ/10); | |
2343 | if (drbd_rs_begin_io(mdev, sector)) | |
80a40e43 | 2344 | goto out_free_e; |
b411b363 | 2345 | |
0f0601f4 LE |
2346 | submit_for_resync: |
2347 | atomic_add(size >> 9, &mdev->rs_sect_ev); | |
2348 | ||
80a40e43 | 2349 | submit: |
b411b363 | 2350 | inc_unacked(mdev); |
87eeee41 | 2351 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 | 2352 | list_add_tail(&peer_req->w.list, &mdev->read_ee); |
87eeee41 | 2353 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 2354 | |
fbe29dec | 2355 | if (drbd_submit_peer_request(mdev, peer_req, READ, fault_type) == 0) |
82bc0194 | 2356 | return 0; |
b411b363 | 2357 | |
10f6d992 LE |
2358 | /* don't care for the reason here */ |
2359 | dev_err(DEV, "submit failed, triggering re-connect\n"); | |
87eeee41 | 2360 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 | 2361 | list_del(&peer_req->w.list); |
87eeee41 | 2362 | spin_unlock_irq(&mdev->tconn->req_lock); |
22cc37a9 LE |
2363 | /* no drbd_rs_complete_io(), we are dropping the connection anyways */ |
2364 | ||
b411b363 | 2365 | out_free_e: |
b411b363 | 2366 | put_ldev(mdev); |
3967deb1 | 2367 | drbd_free_peer_req(mdev, peer_req); |
82bc0194 | 2368 | return -EIO; |
b411b363 PR |
2369 | } |
2370 | ||
2371 | static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local) | |
2372 | { | |
2373 | int self, peer, rv = -100; | |
2374 | unsigned long ch_self, ch_peer; | |
2375 | ||
2376 | self = mdev->ldev->md.uuid[UI_BITMAP] & 1; | |
2377 | peer = mdev->p_uuid[UI_BITMAP] & 1; | |
2378 | ||
2379 | ch_peer = mdev->p_uuid[UI_SIZE]; | |
2380 | ch_self = mdev->comm_bm_set; | |
2381 | ||
89e58e75 | 2382 | switch (mdev->tconn->net_conf->after_sb_0p) { |
b411b363 PR |
2383 | case ASB_CONSENSUS: |
2384 | case ASB_DISCARD_SECONDARY: | |
2385 | case ASB_CALL_HELPER: | |
2386 | dev_err(DEV, "Configuration error.\n"); | |
2387 | break; | |
2388 | case ASB_DISCONNECT: | |
2389 | break; | |
2390 | case ASB_DISCARD_YOUNGER_PRI: | |
2391 | if (self == 0 && peer == 1) { | |
2392 | rv = -1; | |
2393 | break; | |
2394 | } | |
2395 | if (self == 1 && peer == 0) { | |
2396 | rv = 1; | |
2397 | break; | |
2398 | } | |
2399 | /* Else fall through to one of the other strategies... */ | |
2400 | case ASB_DISCARD_OLDER_PRI: | |
2401 | if (self == 0 && peer == 1) { | |
2402 | rv = 1; | |
2403 | break; | |
2404 | } | |
2405 | if (self == 1 && peer == 0) { | |
2406 | rv = -1; | |
2407 | break; | |
2408 | } | |
2409 | /* Else fall through to one of the other strategies... */ | |
ad19bf6e | 2410 | dev_warn(DEV, "Discard younger/older primary did not find a decision\n" |
b411b363 PR |
2411 | "Using discard-least-changes instead\n"); |
2412 | case ASB_DISCARD_ZERO_CHG: | |
2413 | if (ch_peer == 0 && ch_self == 0) { | |
25703f83 | 2414 | rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) |
b411b363 PR |
2415 | ? -1 : 1; |
2416 | break; | |
2417 | } else { | |
2418 | if (ch_peer == 0) { rv = 1; break; } | |
2419 | if (ch_self == 0) { rv = -1; break; } | |
2420 | } | |
89e58e75 | 2421 | if (mdev->tconn->net_conf->after_sb_0p == ASB_DISCARD_ZERO_CHG) |
b411b363 PR |
2422 | break; |
2423 | case ASB_DISCARD_LEAST_CHG: | |
2424 | if (ch_self < ch_peer) | |
2425 | rv = -1; | |
2426 | else if (ch_self > ch_peer) | |
2427 | rv = 1; | |
2428 | else /* ( ch_self == ch_peer ) */ | |
2429 | /* Well, then use something else. */ | |
25703f83 | 2430 | rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) |
b411b363 PR |
2431 | ? -1 : 1; |
2432 | break; | |
2433 | case ASB_DISCARD_LOCAL: | |
2434 | rv = -1; | |
2435 | break; | |
2436 | case ASB_DISCARD_REMOTE: | |
2437 | rv = 1; | |
2438 | } | |
2439 | ||
2440 | return rv; | |
2441 | } | |
2442 | ||
2443 | static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local) | |
2444 | { | |
6184ea21 | 2445 | int hg, rv = -100; |
b411b363 | 2446 | |
89e58e75 | 2447 | switch (mdev->tconn->net_conf->after_sb_1p) { |
b411b363 PR |
2448 | case ASB_DISCARD_YOUNGER_PRI: |
2449 | case ASB_DISCARD_OLDER_PRI: | |
2450 | case ASB_DISCARD_LEAST_CHG: | |
2451 | case ASB_DISCARD_LOCAL: | |
2452 | case ASB_DISCARD_REMOTE: | |
2453 | dev_err(DEV, "Configuration error.\n"); | |
2454 | break; | |
2455 | case ASB_DISCONNECT: | |
2456 | break; | |
2457 | case ASB_CONSENSUS: | |
2458 | hg = drbd_asb_recover_0p(mdev); | |
2459 | if (hg == -1 && mdev->state.role == R_SECONDARY) | |
2460 | rv = hg; | |
2461 | if (hg == 1 && mdev->state.role == R_PRIMARY) | |
2462 | rv = hg; | |
2463 | break; | |
2464 | case ASB_VIOLENTLY: | |
2465 | rv = drbd_asb_recover_0p(mdev); | |
2466 | break; | |
2467 | case ASB_DISCARD_SECONDARY: | |
2468 | return mdev->state.role == R_PRIMARY ? 1 : -1; | |
2469 | case ASB_CALL_HELPER: | |
2470 | hg = drbd_asb_recover_0p(mdev); | |
2471 | if (hg == -1 && mdev->state.role == R_PRIMARY) { | |
bb437946 AG |
2472 | enum drbd_state_rv rv2; |
2473 | ||
2474 | drbd_set_role(mdev, R_SECONDARY, 0); | |
b411b363 PR |
2475 | /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, |
2476 | * we might be here in C_WF_REPORT_PARAMS which is transient. | |
2477 | * we do not need to wait for the after state change work either. */ | |
bb437946 AG |
2478 | rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); |
2479 | if (rv2 != SS_SUCCESS) { | |
b411b363 PR |
2480 | drbd_khelper(mdev, "pri-lost-after-sb"); |
2481 | } else { | |
2482 | dev_warn(DEV, "Successfully gave up primary role.\n"); | |
2483 | rv = hg; | |
2484 | } | |
2485 | } else | |
2486 | rv = hg; | |
2487 | } | |
2488 | ||
2489 | return rv; | |
2490 | } | |
2491 | ||
2492 | static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local) | |
2493 | { | |
6184ea21 | 2494 | int hg, rv = -100; |
b411b363 | 2495 | |
89e58e75 | 2496 | switch (mdev->tconn->net_conf->after_sb_2p) { |
b411b363 PR |
2497 | case ASB_DISCARD_YOUNGER_PRI: |
2498 | case ASB_DISCARD_OLDER_PRI: | |
2499 | case ASB_DISCARD_LEAST_CHG: | |
2500 | case ASB_DISCARD_LOCAL: | |
2501 | case ASB_DISCARD_REMOTE: | |
2502 | case ASB_CONSENSUS: | |
2503 | case ASB_DISCARD_SECONDARY: | |
2504 | dev_err(DEV, "Configuration error.\n"); | |
2505 | break; | |
2506 | case ASB_VIOLENTLY: | |
2507 | rv = drbd_asb_recover_0p(mdev); | |
2508 | break; | |
2509 | case ASB_DISCONNECT: | |
2510 | break; | |
2511 | case ASB_CALL_HELPER: | |
2512 | hg = drbd_asb_recover_0p(mdev); | |
2513 | if (hg == -1) { | |
bb437946 AG |
2514 | enum drbd_state_rv rv2; |
2515 | ||
b411b363 PR |
2516 | /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, |
2517 | * we might be here in C_WF_REPORT_PARAMS which is transient. | |
2518 | * we do not need to wait for the after state change work either. */ | |
bb437946 AG |
2519 | rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); |
2520 | if (rv2 != SS_SUCCESS) { | |
b411b363 PR |
2521 | drbd_khelper(mdev, "pri-lost-after-sb"); |
2522 | } else { | |
2523 | dev_warn(DEV, "Successfully gave up primary role.\n"); | |
2524 | rv = hg; | |
2525 | } | |
2526 | } else | |
2527 | rv = hg; | |
2528 | } | |
2529 | ||
2530 | return rv; | |
2531 | } | |
2532 | ||
2533 | static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid, | |
2534 | u64 bits, u64 flags) | |
2535 | { | |
2536 | if (!uuid) { | |
2537 | dev_info(DEV, "%s uuid info vanished while I was looking!\n", text); | |
2538 | return; | |
2539 | } | |
2540 | dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", | |
2541 | text, | |
2542 | (unsigned long long)uuid[UI_CURRENT], | |
2543 | (unsigned long long)uuid[UI_BITMAP], | |
2544 | (unsigned long long)uuid[UI_HISTORY_START], | |
2545 | (unsigned long long)uuid[UI_HISTORY_END], | |
2546 | (unsigned long long)bits, | |
2547 | (unsigned long long)flags); | |
2548 | } | |
2549 | ||
2550 | /* | |
2551 | 100 after split brain try auto recover | |
2552 | 2 C_SYNC_SOURCE set BitMap | |
2553 | 1 C_SYNC_SOURCE use BitMap | |
2554 | 0 no Sync | |
2555 | -1 C_SYNC_TARGET use BitMap | |
2556 | -2 C_SYNC_TARGET set BitMap | |
2557 | -100 after split brain, disconnect | |
2558 | -1000 unrelated data | |
4a23f264 PR |
2559 | -1091 requires proto 91 |
2560 | -1096 requires proto 96 | |
b411b363 PR |
2561 | */ |
2562 | static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local) | |
2563 | { | |
2564 | u64 self, peer; | |
2565 | int i, j; | |
2566 | ||
2567 | self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); | |
2568 | peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); | |
2569 | ||
2570 | *rule_nr = 10; | |
2571 | if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) | |
2572 | return 0; | |
2573 | ||
2574 | *rule_nr = 20; | |
2575 | if ((self == UUID_JUST_CREATED || self == (u64)0) && | |
2576 | peer != UUID_JUST_CREATED) | |
2577 | return -2; | |
2578 | ||
2579 | *rule_nr = 30; | |
2580 | if (self != UUID_JUST_CREATED && | |
2581 | (peer == UUID_JUST_CREATED || peer == (u64)0)) | |
2582 | return 2; | |
2583 | ||
2584 | if (self == peer) { | |
2585 | int rct, dc; /* roles at crash time */ | |
2586 | ||
2587 | if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) { | |
2588 | ||
31890f4a | 2589 | if (mdev->tconn->agreed_pro_version < 91) |
4a23f264 | 2590 | return -1091; |
b411b363 PR |
2591 | |
2592 | if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) && | |
2593 | (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { | |
2594 | dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n"); | |
2595 | drbd_uuid_set_bm(mdev, 0UL); | |
2596 | ||
2597 | drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, | |
2598 | mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); | |
2599 | *rule_nr = 34; | |
2600 | } else { | |
2601 | dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n"); | |
2602 | *rule_nr = 36; | |
2603 | } | |
2604 | ||
2605 | return 1; | |
2606 | } | |
2607 | ||
2608 | if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) { | |
2609 | ||
31890f4a | 2610 | if (mdev->tconn->agreed_pro_version < 91) |
4a23f264 | 2611 | return -1091; |
b411b363 PR |
2612 | |
2613 | if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) && | |
2614 | (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) { | |
2615 | dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); | |
2616 | ||
2617 | mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START]; | |
2618 | mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP]; | |
2619 | mdev->p_uuid[UI_BITMAP] = 0UL; | |
2620 | ||
2621 | drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); | |
2622 | *rule_nr = 35; | |
2623 | } else { | |
2624 | dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n"); | |
2625 | *rule_nr = 37; | |
2626 | } | |
2627 | ||
2628 | return -1; | |
2629 | } | |
2630 | ||
2631 | /* Common power [off|failure] */ | |
2632 | rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) + | |
2633 | (mdev->p_uuid[UI_FLAGS] & 2); | |
2634 | /* lowest bit is set when we were primary, | |
2635 | * next bit (weight 2) is set when peer was primary */ | |
2636 | *rule_nr = 40; | |
2637 | ||
2638 | switch (rct) { | |
2639 | case 0: /* !self_pri && !peer_pri */ return 0; | |
2640 | case 1: /* self_pri && !peer_pri */ return 1; | |
2641 | case 2: /* !self_pri && peer_pri */ return -1; | |
2642 | case 3: /* self_pri && peer_pri */ | |
25703f83 | 2643 | dc = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags); |
b411b363 PR |
2644 | return dc ? -1 : 1; |
2645 | } | |
2646 | } | |
2647 | ||
2648 | *rule_nr = 50; | |
2649 | peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); | |
2650 | if (self == peer) | |
2651 | return -1; | |
2652 | ||
2653 | *rule_nr = 51; | |
2654 | peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); | |
2655 | if (self == peer) { | |
31890f4a | 2656 | if (mdev->tconn->agreed_pro_version < 96 ? |
4a23f264 PR |
2657 | (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == |
2658 | (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) : | |
2659 | peer + UUID_NEW_BM_OFFSET == (mdev->p_uuid[UI_BITMAP] & ~((u64)1))) { | |
b411b363 PR |
2660 | /* The last P_SYNC_UUID did not get though. Undo the last start of |
2661 | resync as sync source modifications of the peer's UUIDs. */ | |
2662 | ||
31890f4a | 2663 | if (mdev->tconn->agreed_pro_version < 91) |
4a23f264 | 2664 | return -1091; |
b411b363 PR |
2665 | |
2666 | mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START]; | |
2667 | mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1]; | |
4a23f264 PR |
2668 | |
2669 | dev_info(DEV, "Did not got last syncUUID packet, corrected:\n"); | |
2670 | drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); | |
2671 | ||
b411b363 PR |
2672 | return -1; |
2673 | } | |
2674 | } | |
2675 | ||
2676 | *rule_nr = 60; | |
2677 | self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); | |
2678 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { | |
2679 | peer = mdev->p_uuid[i] & ~((u64)1); | |
2680 | if (self == peer) | |
2681 | return -2; | |
2682 | } | |
2683 | ||
2684 | *rule_nr = 70; | |
2685 | self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); | |
2686 | peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); | |
2687 | if (self == peer) | |
2688 | return 1; | |
2689 | ||
2690 | *rule_nr = 71; | |
2691 | self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); | |
2692 | if (self == peer) { | |
31890f4a | 2693 | if (mdev->tconn->agreed_pro_version < 96 ? |
4a23f264 PR |
2694 | (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == |
2695 | (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) : | |
2696 | self + UUID_NEW_BM_OFFSET == (mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) { | |
b411b363 PR |
2697 | /* The last P_SYNC_UUID did not get though. Undo the last start of |
2698 | resync as sync source modifications of our UUIDs. */ | |
2699 | ||
31890f4a | 2700 | if (mdev->tconn->agreed_pro_version < 91) |
4a23f264 | 2701 | return -1091; |
b411b363 PR |
2702 | |
2703 | _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]); | |
2704 | _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]); | |
2705 | ||
4a23f264 | 2706 | dev_info(DEV, "Last syncUUID did not get through, corrected:\n"); |
b411b363 PR |
2707 | drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, |
2708 | mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); | |
2709 | ||
2710 | return 1; | |
2711 | } | |
2712 | } | |
2713 | ||
2714 | ||
2715 | *rule_nr = 80; | |
d8c2a36b | 2716 | peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); |
b411b363 PR |
2717 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { |
2718 | self = mdev->ldev->md.uuid[i] & ~((u64)1); | |
2719 | if (self == peer) | |
2720 | return 2; | |
2721 | } | |
2722 | ||
2723 | *rule_nr = 90; | |
2724 | self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); | |
2725 | peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); | |
2726 | if (self == peer && self != ((u64)0)) | |
2727 | return 100; | |
2728 | ||
2729 | *rule_nr = 100; | |
2730 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { | |
2731 | self = mdev->ldev->md.uuid[i] & ~((u64)1); | |
2732 | for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { | |
2733 | peer = mdev->p_uuid[j] & ~((u64)1); | |
2734 | if (self == peer) | |
2735 | return -100; | |
2736 | } | |
2737 | } | |
2738 | ||
2739 | return -1000; | |
2740 | } | |
2741 | ||
2742 | /* drbd_sync_handshake() returns the new conn state on success, or | |
2743 | CONN_MASK (-1) on failure. | |
2744 | */ | |
2745 | static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role, | |
2746 | enum drbd_disk_state peer_disk) __must_hold(local) | |
2747 | { | |
2748 | int hg, rule_nr; | |
2749 | enum drbd_conns rv = C_MASK; | |
2750 | enum drbd_disk_state mydisk; | |
2751 | ||
2752 | mydisk = mdev->state.disk; | |
2753 | if (mydisk == D_NEGOTIATING) | |
2754 | mydisk = mdev->new_state_tmp.disk; | |
2755 | ||
2756 | dev_info(DEV, "drbd_sync_handshake:\n"); | |
2757 | drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0); | |
2758 | drbd_uuid_dump(mdev, "peer", mdev->p_uuid, | |
2759 | mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); | |
2760 | ||
2761 | hg = drbd_uuid_compare(mdev, &rule_nr); | |
2762 | ||
2763 | dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr); | |
2764 | ||
2765 | if (hg == -1000) { | |
2766 | dev_alert(DEV, "Unrelated data, aborting!\n"); | |
2767 | return C_MASK; | |
2768 | } | |
4a23f264 PR |
2769 | if (hg < -1000) { |
2770 | dev_alert(DEV, "To resolve this both sides have to support at least protocol %d\n", -hg - 1000); | |
b411b363 PR |
2771 | return C_MASK; |
2772 | } | |
2773 | ||
2774 | if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || | |
2775 | (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { | |
2776 | int f = (hg == -100) || abs(hg) == 2; | |
2777 | hg = mydisk > D_INCONSISTENT ? 1 : -1; | |
2778 | if (f) | |
2779 | hg = hg*2; | |
2780 | dev_info(DEV, "Becoming sync %s due to disk states.\n", | |
2781 | hg > 0 ? "source" : "target"); | |
2782 | } | |
2783 | ||
3a11a487 AG |
2784 | if (abs(hg) == 100) |
2785 | drbd_khelper(mdev, "initial-split-brain"); | |
2786 | ||
89e58e75 | 2787 | if (hg == 100 || (hg == -100 && mdev->tconn->net_conf->always_asbp)) { |
b411b363 PR |
2788 | int pcount = (mdev->state.role == R_PRIMARY) |
2789 | + (peer_role == R_PRIMARY); | |
2790 | int forced = (hg == -100); | |
2791 | ||
2792 | switch (pcount) { | |
2793 | case 0: | |
2794 | hg = drbd_asb_recover_0p(mdev); | |
2795 | break; | |
2796 | case 1: | |
2797 | hg = drbd_asb_recover_1p(mdev); | |
2798 | break; | |
2799 | case 2: | |
2800 | hg = drbd_asb_recover_2p(mdev); | |
2801 | break; | |
2802 | } | |
2803 | if (abs(hg) < 100) { | |
2804 | dev_warn(DEV, "Split-Brain detected, %d primaries, " | |
2805 | "automatically solved. Sync from %s node\n", | |
2806 | pcount, (hg < 0) ? "peer" : "this"); | |
2807 | if (forced) { | |
2808 | dev_warn(DEV, "Doing a full sync, since" | |
2809 | " UUIDs where ambiguous.\n"); | |
2810 | hg = hg*2; | |
2811 | } | |
2812 | } | |
2813 | } | |
2814 | ||
2815 | if (hg == -100) { | |
89e58e75 | 2816 | if (mdev->tconn->net_conf->want_lose && !(mdev->p_uuid[UI_FLAGS]&1)) |
b411b363 | 2817 | hg = -1; |
89e58e75 | 2818 | if (!mdev->tconn->net_conf->want_lose && (mdev->p_uuid[UI_FLAGS]&1)) |
b411b363 PR |
2819 | hg = 1; |
2820 | ||
2821 | if (abs(hg) < 100) | |
2822 | dev_warn(DEV, "Split-Brain detected, manually solved. " | |
2823 | "Sync from %s node\n", | |
2824 | (hg < 0) ? "peer" : "this"); | |
2825 | } | |
2826 | ||
2827 | if (hg == -100) { | |
580b9767 LE |
2828 | /* FIXME this log message is not correct if we end up here |
2829 | * after an attempted attach on a diskless node. | |
2830 | * We just refuse to attach -- well, we drop the "connection" | |
2831 | * to that disk, in a way... */ | |
3a11a487 | 2832 | dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n"); |
b411b363 PR |
2833 | drbd_khelper(mdev, "split-brain"); |
2834 | return C_MASK; | |
2835 | } | |
2836 | ||
2837 | if (hg > 0 && mydisk <= D_INCONSISTENT) { | |
2838 | dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n"); | |
2839 | return C_MASK; | |
2840 | } | |
2841 | ||
2842 | if (hg < 0 && /* by intention we do not use mydisk here. */ | |
2843 | mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) { | |
89e58e75 | 2844 | switch (mdev->tconn->net_conf->rr_conflict) { |
b411b363 PR |
2845 | case ASB_CALL_HELPER: |
2846 | drbd_khelper(mdev, "pri-lost"); | |
2847 | /* fall through */ | |
2848 | case ASB_DISCONNECT: | |
2849 | dev_err(DEV, "I shall become SyncTarget, but I am primary!\n"); | |
2850 | return C_MASK; | |
2851 | case ASB_VIOLENTLY: | |
2852 | dev_warn(DEV, "Becoming SyncTarget, violating the stable-data" | |
2853 | "assumption\n"); | |
2854 | } | |
2855 | } | |
2856 | ||
8169e41b | 2857 | if (mdev->tconn->net_conf->dry_run || test_bit(CONN_DRY_RUN, &mdev->tconn->flags)) { |
cf14c2e9 PR |
2858 | if (hg == 0) |
2859 | dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n"); | |
2860 | else | |
2861 | dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.", | |
2862 | drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), | |
2863 | abs(hg) >= 2 ? "full" : "bit-map based"); | |
2864 | return C_MASK; | |
2865 | } | |
2866 | ||
b411b363 PR |
2867 | if (abs(hg) >= 2) { |
2868 | dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); | |
20ceb2b2 LE |
2869 | if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake", |
2870 | BM_LOCKED_SET_ALLOWED)) | |
b411b363 PR |
2871 | return C_MASK; |
2872 | } | |
2873 | ||
2874 | if (hg > 0) { /* become sync source. */ | |
2875 | rv = C_WF_BITMAP_S; | |
2876 | } else if (hg < 0) { /* become sync target */ | |
2877 | rv = C_WF_BITMAP_T; | |
2878 | } else { | |
2879 | rv = C_CONNECTED; | |
2880 | if (drbd_bm_total_weight(mdev)) { | |
2881 | dev_info(DEV, "No resync, but %lu bits in bitmap!\n", | |
2882 | drbd_bm_total_weight(mdev)); | |
2883 | } | |
2884 | } | |
2885 | ||
2886 | return rv; | |
2887 | } | |
2888 | ||
2889 | /* returns 1 if invalid */ | |
2890 | static int cmp_after_sb(enum drbd_after_sb_p peer, enum drbd_after_sb_p self) | |
2891 | { | |
2892 | /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ | |
2893 | if ((peer == ASB_DISCARD_REMOTE && self == ASB_DISCARD_LOCAL) || | |
2894 | (self == ASB_DISCARD_REMOTE && peer == ASB_DISCARD_LOCAL)) | |
2895 | return 0; | |
2896 | ||
2897 | /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ | |
2898 | if (peer == ASB_DISCARD_REMOTE || peer == ASB_DISCARD_LOCAL || | |
2899 | self == ASB_DISCARD_REMOTE || self == ASB_DISCARD_LOCAL) | |
2900 | return 1; | |
2901 | ||
2902 | /* everything else is valid if they are equal on both sides. */ | |
2903 | if (peer == self) | |
2904 | return 0; | |
2905 | ||
2906 | /* everything es is invalid. */ | |
2907 | return 1; | |
2908 | } | |
2909 | ||
e2857216 | 2910 | static int receive_protocol(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 2911 | { |
e658983a | 2912 | struct p_protocol *p = pi->data; |
b411b363 | 2913 | int p_proto, p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; |
cf14c2e9 | 2914 | int p_want_lose, p_two_primaries, cf; |
b411b363 PR |
2915 | char p_integrity_alg[SHARED_SECRET_MAX] = ""; |
2916 | ||
b411b363 PR |
2917 | p_proto = be32_to_cpu(p->protocol); |
2918 | p_after_sb_0p = be32_to_cpu(p->after_sb_0p); | |
2919 | p_after_sb_1p = be32_to_cpu(p->after_sb_1p); | |
2920 | p_after_sb_2p = be32_to_cpu(p->after_sb_2p); | |
b411b363 | 2921 | p_two_primaries = be32_to_cpu(p->two_primaries); |
cf14c2e9 PR |
2922 | cf = be32_to_cpu(p->conn_flags); |
2923 | p_want_lose = cf & CF_WANT_LOSE; | |
2924 | ||
7204624c | 2925 | clear_bit(CONN_DRY_RUN, &tconn->flags); |
cf14c2e9 PR |
2926 | |
2927 | if (cf & CF_DRY_RUN) | |
7204624c | 2928 | set_bit(CONN_DRY_RUN, &tconn->flags); |
b411b363 | 2929 | |
7204624c PR |
2930 | if (p_proto != tconn->net_conf->wire_protocol) { |
2931 | conn_err(tconn, "incompatible communication protocols\n"); | |
b411b363 PR |
2932 | goto disconnect; |
2933 | } | |
2934 | ||
7204624c PR |
2935 | if (cmp_after_sb(p_after_sb_0p, tconn->net_conf->after_sb_0p)) { |
2936 | conn_err(tconn, "incompatible after-sb-0pri settings\n"); | |
b411b363 PR |
2937 | goto disconnect; |
2938 | } | |
2939 | ||
7204624c PR |
2940 | if (cmp_after_sb(p_after_sb_1p, tconn->net_conf->after_sb_1p)) { |
2941 | conn_err(tconn, "incompatible after-sb-1pri settings\n"); | |
b411b363 PR |
2942 | goto disconnect; |
2943 | } | |
2944 | ||
7204624c PR |
2945 | if (cmp_after_sb(p_after_sb_2p, tconn->net_conf->after_sb_2p)) { |
2946 | conn_err(tconn, "incompatible after-sb-2pri settings\n"); | |
b411b363 PR |
2947 | goto disconnect; |
2948 | } | |
2949 | ||
7204624c PR |
2950 | if (p_want_lose && tconn->net_conf->want_lose) { |
2951 | conn_err(tconn, "both sides have the 'want_lose' flag set\n"); | |
b411b363 PR |
2952 | goto disconnect; |
2953 | } | |
2954 | ||
7204624c PR |
2955 | if (p_two_primaries != tconn->net_conf->two_primaries) { |
2956 | conn_err(tconn, "incompatible setting of the two-primaries options\n"); | |
b411b363 PR |
2957 | goto disconnect; |
2958 | } | |
2959 | ||
7204624c PR |
2960 | if (tconn->agreed_pro_version >= 87) { |
2961 | unsigned char *my_alg = tconn->net_conf->integrity_alg; | |
82bc0194 | 2962 | int err; |
b411b363 | 2963 | |
e2857216 | 2964 | err = drbd_recv_all(tconn, p_integrity_alg, pi->size); |
82bc0194 AG |
2965 | if (err) |
2966 | return err; | |
b411b363 PR |
2967 | |
2968 | p_integrity_alg[SHARED_SECRET_MAX-1] = 0; | |
2969 | if (strcmp(p_integrity_alg, my_alg)) { | |
7204624c | 2970 | conn_err(tconn, "incompatible setting of the data-integrity-alg\n"); |
b411b363 PR |
2971 | goto disconnect; |
2972 | } | |
7204624c | 2973 | conn_info(tconn, "data-integrity-alg: %s\n", |
b411b363 PR |
2974 | my_alg[0] ? my_alg : (unsigned char *)"<not-used>"); |
2975 | } | |
2976 | ||
82bc0194 | 2977 | return 0; |
b411b363 PR |
2978 | |
2979 | disconnect: | |
7204624c | 2980 | conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 2981 | return -EIO; |
b411b363 PR |
2982 | } |
2983 | ||
2984 | /* helper function | |
2985 | * input: alg name, feature name | |
2986 | * return: NULL (alg name was "") | |
2987 | * ERR_PTR(error) if something goes wrong | |
2988 | * or the crypto hash ptr, if it worked out ok. */ | |
2989 | struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev, | |
2990 | const char *alg, const char *name) | |
2991 | { | |
2992 | struct crypto_hash *tfm; | |
2993 | ||
2994 | if (!alg[0]) | |
2995 | return NULL; | |
2996 | ||
2997 | tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC); | |
2998 | if (IS_ERR(tfm)) { | |
2999 | dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n", | |
3000 | alg, name, PTR_ERR(tfm)); | |
3001 | return tfm; | |
3002 | } | |
3003 | if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) { | |
3004 | crypto_free_hash(tfm); | |
3005 | dev_err(DEV, "\"%s\" is not a digest (%s)\n", alg, name); | |
3006 | return ERR_PTR(-EINVAL); | |
3007 | } | |
3008 | return tfm; | |
3009 | } | |
3010 | ||
4a76b161 AG |
3011 | static int ignore_remaining_packet(struct drbd_tconn *tconn, struct packet_info *pi) |
3012 | { | |
3013 | void *buffer = tconn->data.rbuf; | |
3014 | int size = pi->size; | |
3015 | ||
3016 | while (size) { | |
3017 | int s = min_t(int, size, DRBD_SOCKET_BUFFER_SIZE); | |
3018 | s = drbd_recv(tconn, buffer, s); | |
3019 | if (s <= 0) { | |
3020 | if (s < 0) | |
3021 | return s; | |
3022 | break; | |
3023 | } | |
3024 | size -= s; | |
3025 | } | |
3026 | if (size) | |
3027 | return -EIO; | |
3028 | return 0; | |
3029 | } | |
3030 | ||
3031 | /* | |
3032 | * config_unknown_volume - device configuration command for unknown volume | |
3033 | * | |
3034 | * When a device is added to an existing connection, the node on which the | |
3035 | * device is added first will send configuration commands to its peer but the | |
3036 | * peer will not know about the device yet. It will warn and ignore these | |
3037 | * commands. Once the device is added on the second node, the second node will | |
3038 | * send the same device configuration commands, but in the other direction. | |
3039 | * | |
3040 | * (We can also end up here if drbd is misconfigured.) | |
3041 | */ | |
3042 | static int config_unknown_volume(struct drbd_tconn *tconn, struct packet_info *pi) | |
3043 | { | |
3044 | conn_warn(tconn, "Volume %u unknown; ignoring %s packet\n", | |
3045 | pi->vnr, cmdname(pi->cmd)); | |
3046 | return ignore_remaining_packet(tconn, pi); | |
3047 | } | |
3048 | ||
3049 | static int receive_SyncParam(struct drbd_tconn *tconn, struct packet_info *pi) | |
b411b363 | 3050 | { |
4a76b161 | 3051 | struct drbd_conf *mdev; |
e658983a | 3052 | struct p_rs_param_95 *p; |
b411b363 PR |
3053 | unsigned int header_size, data_size, exp_max_sz; |
3054 | struct crypto_hash *verify_tfm = NULL; | |
3055 | struct crypto_hash *csums_tfm = NULL; | |
4a76b161 | 3056 | const int apv = tconn->agreed_pro_version; |
778f271d PR |
3057 | int *rs_plan_s = NULL; |
3058 | int fifo_size = 0; | |
82bc0194 | 3059 | int err; |
b411b363 | 3060 | |
4a76b161 AG |
3061 | mdev = vnr_to_mdev(tconn, pi->vnr); |
3062 | if (!mdev) | |
3063 | return config_unknown_volume(tconn, pi); | |
3064 | ||
b411b363 PR |
3065 | exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) |
3066 | : apv == 88 ? sizeof(struct p_rs_param) | |
3067 | + SHARED_SECRET_MAX | |
8e26f9cc PR |
3068 | : apv <= 94 ? sizeof(struct p_rs_param_89) |
3069 | : /* apv >= 95 */ sizeof(struct p_rs_param_95); | |
b411b363 | 3070 | |
e2857216 | 3071 | if (pi->size > exp_max_sz) { |
b411b363 | 3072 | dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n", |
e2857216 | 3073 | pi->size, exp_max_sz); |
82bc0194 | 3074 | return -EIO; |
b411b363 PR |
3075 | } |
3076 | ||
3077 | if (apv <= 88) { | |
e658983a | 3078 | header_size = sizeof(struct p_rs_param); |
e2857216 | 3079 | data_size = pi->size - header_size; |
8e26f9cc | 3080 | } else if (apv <= 94) { |
e658983a | 3081 | header_size = sizeof(struct p_rs_param_89); |
e2857216 | 3082 | data_size = pi->size - header_size; |
b411b363 | 3083 | D_ASSERT(data_size == 0); |
8e26f9cc | 3084 | } else { |
e658983a | 3085 | header_size = sizeof(struct p_rs_param_95); |
e2857216 | 3086 | data_size = pi->size - header_size; |
b411b363 PR |
3087 | D_ASSERT(data_size == 0); |
3088 | } | |
3089 | ||
3090 | /* initialize verify_alg and csums_alg */ | |
e658983a | 3091 | p = pi->data; |
b411b363 PR |
3092 | memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); |
3093 | ||
e658983a | 3094 | err = drbd_recv_all(mdev->tconn, p, header_size); |
82bc0194 AG |
3095 | if (err) |
3096 | return err; | |
b411b363 | 3097 | |
f399002e LE |
3098 | if (get_ldev(mdev)) { |
3099 | mdev->ldev->dc.resync_rate = be32_to_cpu(p->rate); | |
3100 | put_ldev(mdev); | |
3101 | } | |
b411b363 PR |
3102 | |
3103 | if (apv >= 88) { | |
3104 | if (apv == 88) { | |
3105 | if (data_size > SHARED_SECRET_MAX) { | |
3106 | dev_err(DEV, "verify-alg too long, " | |
3107 | "peer wants %u, accepting only %u byte\n", | |
3108 | data_size, SHARED_SECRET_MAX); | |
82bc0194 | 3109 | return -EIO; |
b411b363 PR |
3110 | } |
3111 | ||
82bc0194 AG |
3112 | err = drbd_recv_all(mdev->tconn, p->verify_alg, data_size); |
3113 | if (err) | |
3114 | return err; | |
b411b363 PR |
3115 | |
3116 | /* we expect NUL terminated string */ | |
3117 | /* but just in case someone tries to be evil */ | |
3118 | D_ASSERT(p->verify_alg[data_size-1] == 0); | |
3119 | p->verify_alg[data_size-1] = 0; | |
3120 | ||
3121 | } else /* apv >= 89 */ { | |
3122 | /* we still expect NUL terminated strings */ | |
3123 | /* but just in case someone tries to be evil */ | |
3124 | D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0); | |
3125 | D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0); | |
3126 | p->verify_alg[SHARED_SECRET_MAX-1] = 0; | |
3127 | p->csums_alg[SHARED_SECRET_MAX-1] = 0; | |
3128 | } | |
3129 | ||
f399002e | 3130 | if (strcmp(mdev->tconn->net_conf->verify_alg, p->verify_alg)) { |
b411b363 PR |
3131 | if (mdev->state.conn == C_WF_REPORT_PARAMS) { |
3132 | dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", | |
f399002e | 3133 | mdev->tconn->net_conf->verify_alg, p->verify_alg); |
b411b363 PR |
3134 | goto disconnect; |
3135 | } | |
3136 | verify_tfm = drbd_crypto_alloc_digest_safe(mdev, | |
3137 | p->verify_alg, "verify-alg"); | |
3138 | if (IS_ERR(verify_tfm)) { | |
3139 | verify_tfm = NULL; | |
3140 | goto disconnect; | |
3141 | } | |
3142 | } | |
3143 | ||
f399002e | 3144 | if (apv >= 89 && strcmp(mdev->tconn->net_conf->csums_alg, p->csums_alg)) { |
b411b363 PR |
3145 | if (mdev->state.conn == C_WF_REPORT_PARAMS) { |
3146 | dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", | |
f399002e | 3147 | mdev->tconn->net_conf->csums_alg, p->csums_alg); |
b411b363 PR |
3148 | goto disconnect; |
3149 | } | |
3150 | csums_tfm = drbd_crypto_alloc_digest_safe(mdev, | |
3151 | p->csums_alg, "csums-alg"); | |
3152 | if (IS_ERR(csums_tfm)) { | |
3153 | csums_tfm = NULL; | |
3154 | goto disconnect; | |
3155 | } | |
3156 | } | |
3157 | ||
f399002e LE |
3158 | if (apv > 94 && get_ldev(mdev)) { |
3159 | mdev->ldev->dc.resync_rate = be32_to_cpu(p->rate); | |
3160 | mdev->ldev->dc.c_plan_ahead = be32_to_cpu(p->c_plan_ahead); | |
3161 | mdev->ldev->dc.c_delay_target = be32_to_cpu(p->c_delay_target); | |
3162 | mdev->ldev->dc.c_fill_target = be32_to_cpu(p->c_fill_target); | |
3163 | mdev->ldev->dc.c_max_rate = be32_to_cpu(p->c_max_rate); | |
778f271d | 3164 | |
f399002e | 3165 | fifo_size = (mdev->ldev->dc.c_plan_ahead * 10 * SLEEP_TIME) / HZ; |
778f271d PR |
3166 | if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) { |
3167 | rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL); | |
3168 | if (!rs_plan_s) { | |
3169 | dev_err(DEV, "kmalloc of fifo_buffer failed"); | |
f399002e | 3170 | put_ldev(mdev); |
778f271d PR |
3171 | goto disconnect; |
3172 | } | |
3173 | } | |
f399002e | 3174 | put_ldev(mdev); |
8e26f9cc | 3175 | } |
b411b363 PR |
3176 | |
3177 | spin_lock(&mdev->peer_seq_lock); | |
3178 | /* lock against drbd_nl_syncer_conf() */ | |
3179 | if (verify_tfm) { | |
f399002e LE |
3180 | strcpy(mdev->tconn->net_conf->verify_alg, p->verify_alg); |
3181 | mdev->tconn->net_conf->verify_alg_len = strlen(p->verify_alg) + 1; | |
3182 | crypto_free_hash(mdev->tconn->verify_tfm); | |
3183 | mdev->tconn->verify_tfm = verify_tfm; | |
b411b363 PR |
3184 | dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg); |
3185 | } | |
3186 | if (csums_tfm) { | |
f399002e LE |
3187 | strcpy(mdev->tconn->net_conf->csums_alg, p->csums_alg); |
3188 | mdev->tconn->net_conf->csums_alg_len = strlen(p->csums_alg) + 1; | |
3189 | crypto_free_hash(mdev->tconn->csums_tfm); | |
3190 | mdev->tconn->csums_tfm = csums_tfm; | |
b411b363 PR |
3191 | dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg); |
3192 | } | |
778f271d PR |
3193 | if (fifo_size != mdev->rs_plan_s.size) { |
3194 | kfree(mdev->rs_plan_s.values); | |
3195 | mdev->rs_plan_s.values = rs_plan_s; | |
3196 | mdev->rs_plan_s.size = fifo_size; | |
3197 | mdev->rs_planed = 0; | |
3198 | } | |
b411b363 PR |
3199 | spin_unlock(&mdev->peer_seq_lock); |
3200 | } | |
82bc0194 | 3201 | return 0; |
b411b363 | 3202 | |
b411b363 PR |
3203 | disconnect: |
3204 | /* just for completeness: actually not needed, | |
3205 | * as this is not reached if csums_tfm was ok. */ | |
3206 | crypto_free_hash(csums_tfm); | |
3207 | /* but free the verify_tfm again, if csums_tfm did not work out */ | |
3208 | crypto_free_hash(verify_tfm); | |
38fa9988 | 3209 | conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 3210 | return -EIO; |
b411b363 PR |
3211 | } |
3212 | ||
b411b363 PR |
3213 | /* warn if the arguments differ by more than 12.5% */ |
3214 | static void warn_if_differ_considerably(struct drbd_conf *mdev, | |
3215 | const char *s, sector_t a, sector_t b) | |
3216 | { | |
3217 | sector_t d; | |
3218 | if (a == 0 || b == 0) | |
3219 | return; | |
3220 | d = (a > b) ? (a - b) : (b - a); | |
3221 | if (d > (a>>3) || d > (b>>3)) | |
3222 | dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s, | |
3223 | (unsigned long long)a, (unsigned long long)b); | |
3224 | } | |
3225 | ||
4a76b161 | 3226 | static int receive_sizes(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 3227 | { |
4a76b161 | 3228 | struct drbd_conf *mdev; |
e658983a | 3229 | struct p_sizes *p = pi->data; |
b411b363 | 3230 | enum determine_dev_size dd = unchanged; |
b411b363 PR |
3231 | sector_t p_size, p_usize, my_usize; |
3232 | int ldsc = 0; /* local disk size changed */ | |
e89b591c | 3233 | enum dds_flags ddsf; |
b411b363 | 3234 | |
4a76b161 AG |
3235 | mdev = vnr_to_mdev(tconn, pi->vnr); |
3236 | if (!mdev) | |
3237 | return config_unknown_volume(tconn, pi); | |
3238 | ||
b411b363 PR |
3239 | p_size = be64_to_cpu(p->d_size); |
3240 | p_usize = be64_to_cpu(p->u_size); | |
3241 | ||
b411b363 PR |
3242 | /* just store the peer's disk size for now. |
3243 | * we still need to figure out whether we accept that. */ | |
3244 | mdev->p_size = p_size; | |
3245 | ||
b411b363 PR |
3246 | if (get_ldev(mdev)) { |
3247 | warn_if_differ_considerably(mdev, "lower level device sizes", | |
3248 | p_size, drbd_get_max_capacity(mdev->ldev)); | |
3249 | warn_if_differ_considerably(mdev, "user requested size", | |
3250 | p_usize, mdev->ldev->dc.disk_size); | |
3251 | ||
3252 | /* if this is the first connect, or an otherwise expected | |
3253 | * param exchange, choose the minimum */ | |
3254 | if (mdev->state.conn == C_WF_REPORT_PARAMS) | |
3255 | p_usize = min_not_zero((sector_t)mdev->ldev->dc.disk_size, | |
3256 | p_usize); | |
3257 | ||
3258 | my_usize = mdev->ldev->dc.disk_size; | |
3259 | ||
3260 | if (mdev->ldev->dc.disk_size != p_usize) { | |
3261 | mdev->ldev->dc.disk_size = p_usize; | |
3262 | dev_info(DEV, "Peer sets u_size to %lu sectors\n", | |
3263 | (unsigned long)mdev->ldev->dc.disk_size); | |
3264 | } | |
3265 | ||
3266 | /* Never shrink a device with usable data during connect. | |
3267 | But allow online shrinking if we are connected. */ | |
a393db6f | 3268 | if (drbd_new_dev_size(mdev, mdev->ldev, 0) < |
b411b363 PR |
3269 | drbd_get_capacity(mdev->this_bdev) && |
3270 | mdev->state.disk >= D_OUTDATED && | |
3271 | mdev->state.conn < C_CONNECTED) { | |
3272 | dev_err(DEV, "The peer's disk size is too small!\n"); | |
38fa9988 | 3273 | conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 PR |
3274 | mdev->ldev->dc.disk_size = my_usize; |
3275 | put_ldev(mdev); | |
82bc0194 | 3276 | return -EIO; |
b411b363 PR |
3277 | } |
3278 | put_ldev(mdev); | |
3279 | } | |
b411b363 | 3280 | |
e89b591c | 3281 | ddsf = be16_to_cpu(p->dds_flags); |
b411b363 | 3282 | if (get_ldev(mdev)) { |
24c4830c | 3283 | dd = drbd_determine_dev_size(mdev, ddsf); |
b411b363 PR |
3284 | put_ldev(mdev); |
3285 | if (dd == dev_size_error) | |
82bc0194 | 3286 | return -EIO; |
b411b363 PR |
3287 | drbd_md_sync(mdev); |
3288 | } else { | |
3289 | /* I am diskless, need to accept the peer's size. */ | |
3290 | drbd_set_my_capacity(mdev, p_size); | |
3291 | } | |
3292 | ||
99432fcc PR |
3293 | mdev->peer_max_bio_size = be32_to_cpu(p->max_bio_size); |
3294 | drbd_reconsider_max_bio_size(mdev); | |
3295 | ||
b411b363 PR |
3296 | if (get_ldev(mdev)) { |
3297 | if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { | |
3298 | mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); | |
3299 | ldsc = 1; | |
3300 | } | |
3301 | ||
b411b363 PR |
3302 | put_ldev(mdev); |
3303 | } | |
3304 | ||
3305 | if (mdev->state.conn > C_WF_REPORT_PARAMS) { | |
3306 | if (be64_to_cpu(p->c_size) != | |
3307 | drbd_get_capacity(mdev->this_bdev) || ldsc) { | |
3308 | /* we have different sizes, probably peer | |
3309 | * needs to know my new size... */ | |
e89b591c | 3310 | drbd_send_sizes(mdev, 0, ddsf); |
b411b363 PR |
3311 | } |
3312 | if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) || | |
3313 | (dd == grew && mdev->state.conn == C_CONNECTED)) { | |
3314 | if (mdev->state.pdsk >= D_INCONSISTENT && | |
e89b591c PR |
3315 | mdev->state.disk >= D_INCONSISTENT) { |
3316 | if (ddsf & DDSF_NO_RESYNC) | |
3317 | dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n"); | |
3318 | else | |
3319 | resync_after_online_grow(mdev); | |
3320 | } else | |
b411b363 PR |
3321 | set_bit(RESYNC_AFTER_NEG, &mdev->flags); |
3322 | } | |
3323 | } | |
3324 | ||
82bc0194 | 3325 | return 0; |
b411b363 PR |
3326 | } |
3327 | ||
4a76b161 | 3328 | static int receive_uuids(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 3329 | { |
4a76b161 | 3330 | struct drbd_conf *mdev; |
e658983a | 3331 | struct p_uuids *p = pi->data; |
b411b363 | 3332 | u64 *p_uuid; |
62b0da3a | 3333 | int i, updated_uuids = 0; |
b411b363 | 3334 | |
4a76b161 AG |
3335 | mdev = vnr_to_mdev(tconn, pi->vnr); |
3336 | if (!mdev) | |
3337 | return config_unknown_volume(tconn, pi); | |
3338 | ||
b411b363 PR |
3339 | p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); |
3340 | ||
3341 | for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) | |
3342 | p_uuid[i] = be64_to_cpu(p->uuid[i]); | |
3343 | ||
3344 | kfree(mdev->p_uuid); | |
3345 | mdev->p_uuid = p_uuid; | |
3346 | ||
3347 | if (mdev->state.conn < C_CONNECTED && | |
3348 | mdev->state.disk < D_INCONSISTENT && | |
3349 | mdev->state.role == R_PRIMARY && | |
3350 | (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { | |
3351 | dev_err(DEV, "Can only connect to data with current UUID=%016llX\n", | |
3352 | (unsigned long long)mdev->ed_uuid); | |
38fa9988 | 3353 | conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 3354 | return -EIO; |
b411b363 PR |
3355 | } |
3356 | ||
3357 | if (get_ldev(mdev)) { | |
3358 | int skip_initial_sync = | |
3359 | mdev->state.conn == C_CONNECTED && | |
31890f4a | 3360 | mdev->tconn->agreed_pro_version >= 90 && |
b411b363 PR |
3361 | mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && |
3362 | (p_uuid[UI_FLAGS] & 8); | |
3363 | if (skip_initial_sync) { | |
3364 | dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n"); | |
3365 | drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, | |
20ceb2b2 LE |
3366 | "clear_n_write from receive_uuids", |
3367 | BM_LOCKED_TEST_ALLOWED); | |
b411b363 PR |
3368 | _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]); |
3369 | _drbd_uuid_set(mdev, UI_BITMAP, 0); | |
3370 | _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), | |
3371 | CS_VERBOSE, NULL); | |
3372 | drbd_md_sync(mdev); | |
62b0da3a | 3373 | updated_uuids = 1; |
b411b363 PR |
3374 | } |
3375 | put_ldev(mdev); | |
18a50fa2 PR |
3376 | } else if (mdev->state.disk < D_INCONSISTENT && |
3377 | mdev->state.role == R_PRIMARY) { | |
3378 | /* I am a diskless primary, the peer just created a new current UUID | |
3379 | for me. */ | |
62b0da3a | 3380 | updated_uuids = drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); |
b411b363 PR |
3381 | } |
3382 | ||
3383 | /* Before we test for the disk state, we should wait until an eventually | |
3384 | ongoing cluster wide state change is finished. That is important if | |
3385 | we are primary and are detaching from our disk. We need to see the | |
3386 | new disk state... */ | |
8410da8f PR |
3387 | mutex_lock(mdev->state_mutex); |
3388 | mutex_unlock(mdev->state_mutex); | |
b411b363 | 3389 | if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT) |
62b0da3a LE |
3390 | updated_uuids |= drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); |
3391 | ||
3392 | if (updated_uuids) | |
3393 | drbd_print_uuids(mdev, "receiver updated UUIDs to"); | |
b411b363 | 3394 | |
82bc0194 | 3395 | return 0; |
b411b363 PR |
3396 | } |
3397 | ||
3398 | /** | |
3399 | * convert_state() - Converts the peer's view of the cluster state to our point of view | |
3400 | * @ps: The state as seen by the peer. | |
3401 | */ | |
3402 | static union drbd_state convert_state(union drbd_state ps) | |
3403 | { | |
3404 | union drbd_state ms; | |
3405 | ||
3406 | static enum drbd_conns c_tab[] = { | |
3407 | [C_CONNECTED] = C_CONNECTED, | |
3408 | ||
3409 | [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, | |
3410 | [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, | |
3411 | [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ | |
3412 | [C_VERIFY_S] = C_VERIFY_T, | |
3413 | [C_MASK] = C_MASK, | |
3414 | }; | |
3415 | ||
3416 | ms.i = ps.i; | |
3417 | ||
3418 | ms.conn = c_tab[ps.conn]; | |
3419 | ms.peer = ps.role; | |
3420 | ms.role = ps.peer; | |
3421 | ms.pdsk = ps.disk; | |
3422 | ms.disk = ps.pdsk; | |
3423 | ms.peer_isp = (ps.aftr_isp | ps.user_isp); | |
3424 | ||
3425 | return ms; | |
3426 | } | |
3427 | ||
4a76b161 | 3428 | static int receive_req_state(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 3429 | { |
4a76b161 | 3430 | struct drbd_conf *mdev; |
e658983a | 3431 | struct p_req_state *p = pi->data; |
b411b363 | 3432 | union drbd_state mask, val; |
bf885f8a | 3433 | enum drbd_state_rv rv; |
b411b363 | 3434 | |
4a76b161 AG |
3435 | mdev = vnr_to_mdev(tconn, pi->vnr); |
3436 | if (!mdev) | |
3437 | return -EIO; | |
3438 | ||
b411b363 PR |
3439 | mask.i = be32_to_cpu(p->mask); |
3440 | val.i = be32_to_cpu(p->val); | |
3441 | ||
25703f83 | 3442 | if (test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) && |
8410da8f | 3443 | mutex_is_locked(mdev->state_mutex)) { |
b411b363 | 3444 | drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG); |
82bc0194 | 3445 | return 0; |
b411b363 PR |
3446 | } |
3447 | ||
3448 | mask = convert_state(mask); | |
3449 | val = convert_state(val); | |
3450 | ||
dfafcc8a PR |
3451 | rv = drbd_change_state(mdev, CS_VERBOSE, mask, val); |
3452 | drbd_send_sr_reply(mdev, rv); | |
b411b363 | 3453 | |
b411b363 PR |
3454 | drbd_md_sync(mdev); |
3455 | ||
82bc0194 | 3456 | return 0; |
b411b363 PR |
3457 | } |
3458 | ||
e2857216 | 3459 | static int receive_req_conn_state(struct drbd_tconn *tconn, struct packet_info *pi) |
dfafcc8a | 3460 | { |
e658983a | 3461 | struct p_req_state *p = pi->data; |
dfafcc8a PR |
3462 | union drbd_state mask, val; |
3463 | enum drbd_state_rv rv; | |
3464 | ||
3465 | mask.i = be32_to_cpu(p->mask); | |
3466 | val.i = be32_to_cpu(p->val); | |
3467 | ||
3468 | if (test_bit(DISCARD_CONCURRENT, &tconn->flags) && | |
3469 | mutex_is_locked(&tconn->cstate_mutex)) { | |
3470 | conn_send_sr_reply(tconn, SS_CONCURRENT_ST_CHG); | |
82bc0194 | 3471 | return 0; |
dfafcc8a PR |
3472 | } |
3473 | ||
3474 | mask = convert_state(mask); | |
3475 | val = convert_state(val); | |
3476 | ||
778bcf2e | 3477 | rv = conn_request_state(tconn, mask, val, CS_VERBOSE | CS_LOCAL_ONLY | CS_IGN_OUTD_FAIL); |
dfafcc8a PR |
3478 | conn_send_sr_reply(tconn, rv); |
3479 | ||
82bc0194 | 3480 | return 0; |
dfafcc8a PR |
3481 | } |
3482 | ||
4a76b161 | 3483 | static int receive_state(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 3484 | { |
4a76b161 | 3485 | struct drbd_conf *mdev; |
e658983a | 3486 | struct p_state *p = pi->data; |
4ac4aada | 3487 | union drbd_state os, ns, peer_state; |
b411b363 | 3488 | enum drbd_disk_state real_peer_disk; |
65d922c3 | 3489 | enum chg_state_flags cs_flags; |
b411b363 PR |
3490 | int rv; |
3491 | ||
4a76b161 AG |
3492 | mdev = vnr_to_mdev(tconn, pi->vnr); |
3493 | if (!mdev) | |
3494 | return config_unknown_volume(tconn, pi); | |
3495 | ||
b411b363 PR |
3496 | peer_state.i = be32_to_cpu(p->state); |
3497 | ||
3498 | real_peer_disk = peer_state.disk; | |
3499 | if (peer_state.disk == D_NEGOTIATING) { | |
3500 | real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; | |
3501 | dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); | |
3502 | } | |
3503 | ||
87eeee41 | 3504 | spin_lock_irq(&mdev->tconn->req_lock); |
b411b363 | 3505 | retry: |
78bae59b | 3506 | os = ns = drbd_read_state(mdev); |
87eeee41 | 3507 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 3508 | |
e9ef7bb6 LE |
3509 | /* peer says his disk is uptodate, while we think it is inconsistent, |
3510 | * and this happens while we think we have a sync going on. */ | |
3511 | if (os.pdsk == D_INCONSISTENT && real_peer_disk == D_UP_TO_DATE && | |
3512 | os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { | |
3513 | /* If we are (becoming) SyncSource, but peer is still in sync | |
3514 | * preparation, ignore its uptodate-ness to avoid flapping, it | |
3515 | * will change to inconsistent once the peer reaches active | |
3516 | * syncing states. | |
3517 | * It may have changed syncer-paused flags, however, so we | |
3518 | * cannot ignore this completely. */ | |
3519 | if (peer_state.conn > C_CONNECTED && | |
3520 | peer_state.conn < C_SYNC_SOURCE) | |
3521 | real_peer_disk = D_INCONSISTENT; | |
3522 | ||
3523 | /* if peer_state changes to connected at the same time, | |
3524 | * it explicitly notifies us that it finished resync. | |
3525 | * Maybe we should finish it up, too? */ | |
3526 | else if (os.conn >= C_SYNC_SOURCE && | |
3527 | peer_state.conn == C_CONNECTED) { | |
3528 | if (drbd_bm_total_weight(mdev) <= mdev->rs_failed) | |
3529 | drbd_resync_finished(mdev); | |
82bc0194 | 3530 | return 0; |
e9ef7bb6 LE |
3531 | } |
3532 | } | |
3533 | ||
3534 | /* peer says his disk is inconsistent, while we think it is uptodate, | |
3535 | * and this happens while the peer still thinks we have a sync going on, | |
3536 | * but we think we are already done with the sync. | |
3537 | * We ignore this to avoid flapping pdsk. | |
3538 | * This should not happen, if the peer is a recent version of drbd. */ | |
3539 | if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && | |
3540 | os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) | |
3541 | real_peer_disk = D_UP_TO_DATE; | |
3542 | ||
4ac4aada LE |
3543 | if (ns.conn == C_WF_REPORT_PARAMS) |
3544 | ns.conn = C_CONNECTED; | |
b411b363 | 3545 | |
67531718 PR |
3546 | if (peer_state.conn == C_AHEAD) |
3547 | ns.conn = C_BEHIND; | |
3548 | ||
b411b363 PR |
3549 | if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING && |
3550 | get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
3551 | int cr; /* consider resync */ | |
3552 | ||
3553 | /* if we established a new connection */ | |
4ac4aada | 3554 | cr = (os.conn < C_CONNECTED); |
b411b363 PR |
3555 | /* if we had an established connection |
3556 | * and one of the nodes newly attaches a disk */ | |
4ac4aada | 3557 | cr |= (os.conn == C_CONNECTED && |
b411b363 | 3558 | (peer_state.disk == D_NEGOTIATING || |
4ac4aada | 3559 | os.disk == D_NEGOTIATING)); |
b411b363 PR |
3560 | /* if we have both been inconsistent, and the peer has been |
3561 | * forced to be UpToDate with --overwrite-data */ | |
3562 | cr |= test_bit(CONSIDER_RESYNC, &mdev->flags); | |
3563 | /* if we had been plain connected, and the admin requested to | |
3564 | * start a sync by "invalidate" or "invalidate-remote" */ | |
4ac4aada | 3565 | cr |= (os.conn == C_CONNECTED && |
b411b363 PR |
3566 | (peer_state.conn >= C_STARTING_SYNC_S && |
3567 | peer_state.conn <= C_WF_BITMAP_T)); | |
3568 | ||
3569 | if (cr) | |
4ac4aada | 3570 | ns.conn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk); |
b411b363 PR |
3571 | |
3572 | put_ldev(mdev); | |
4ac4aada LE |
3573 | if (ns.conn == C_MASK) { |
3574 | ns.conn = C_CONNECTED; | |
b411b363 | 3575 | if (mdev->state.disk == D_NEGOTIATING) { |
82f59cc6 | 3576 | drbd_force_state(mdev, NS(disk, D_FAILED)); |
b411b363 PR |
3577 | } else if (peer_state.disk == D_NEGOTIATING) { |
3578 | dev_err(DEV, "Disk attach process on the peer node was aborted.\n"); | |
3579 | peer_state.disk = D_DISKLESS; | |
580b9767 | 3580 | real_peer_disk = D_DISKLESS; |
b411b363 | 3581 | } else { |
8169e41b | 3582 | if (test_and_clear_bit(CONN_DRY_RUN, &mdev->tconn->flags)) |
82bc0194 | 3583 | return -EIO; |
4ac4aada | 3584 | D_ASSERT(os.conn == C_WF_REPORT_PARAMS); |
38fa9988 | 3585 | conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 3586 | return -EIO; |
b411b363 PR |
3587 | } |
3588 | } | |
3589 | } | |
3590 | ||
87eeee41 | 3591 | spin_lock_irq(&mdev->tconn->req_lock); |
78bae59b | 3592 | if (os.i != drbd_read_state(mdev).i) |
b411b363 PR |
3593 | goto retry; |
3594 | clear_bit(CONSIDER_RESYNC, &mdev->flags); | |
b411b363 PR |
3595 | ns.peer = peer_state.role; |
3596 | ns.pdsk = real_peer_disk; | |
3597 | ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); | |
4ac4aada | 3598 | if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) |
b411b363 | 3599 | ns.disk = mdev->new_state_tmp.disk; |
4ac4aada | 3600 | cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); |
2aebfabb | 3601 | if (ns.pdsk == D_CONSISTENT && drbd_suspended(mdev) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && |
481c6f50 | 3602 | test_bit(NEW_CUR_UUID, &mdev->flags)) { |
8554df1c | 3603 | /* Do not allow tl_restart(RESEND) for a rebooted peer. We can only allow this |
481c6f50 | 3604 | for temporal network outages! */ |
87eeee41 | 3605 | spin_unlock_irq(&mdev->tconn->req_lock); |
481c6f50 | 3606 | dev_err(DEV, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); |
2f5cdd0b | 3607 | tl_clear(mdev->tconn); |
481c6f50 PR |
3608 | drbd_uuid_new_current(mdev); |
3609 | clear_bit(NEW_CUR_UUID, &mdev->flags); | |
38fa9988 | 3610 | conn_request_state(mdev->tconn, NS2(conn, C_PROTOCOL_ERROR, susp, 0), CS_HARD); |
82bc0194 | 3611 | return -EIO; |
481c6f50 | 3612 | } |
65d922c3 | 3613 | rv = _drbd_set_state(mdev, ns, cs_flags, NULL); |
78bae59b | 3614 | ns = drbd_read_state(mdev); |
87eeee41 | 3615 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
3616 | |
3617 | if (rv < SS_SUCCESS) { | |
38fa9988 | 3618 | conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 3619 | return -EIO; |
b411b363 PR |
3620 | } |
3621 | ||
4ac4aada LE |
3622 | if (os.conn > C_WF_REPORT_PARAMS) { |
3623 | if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED && | |
b411b363 PR |
3624 | peer_state.disk != D_NEGOTIATING ) { |
3625 | /* we want resync, peer has not yet decided to sync... */ | |
3626 | /* Nowadays only used when forcing a node into primary role and | |
3627 | setting its disk to UpToDate with that */ | |
3628 | drbd_send_uuids(mdev); | |
3629 | drbd_send_state(mdev); | |
3630 | } | |
3631 | } | |
3632 | ||
89e58e75 | 3633 | mdev->tconn->net_conf->want_lose = 0; |
b411b363 PR |
3634 | |
3635 | drbd_md_sync(mdev); /* update connected indicator, la_size, ... */ | |
3636 | ||
82bc0194 | 3637 | return 0; |
b411b363 PR |
3638 | } |
3639 | ||
4a76b161 | 3640 | static int receive_sync_uuid(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 3641 | { |
4a76b161 | 3642 | struct drbd_conf *mdev; |
e658983a | 3643 | struct p_rs_uuid *p = pi->data; |
4a76b161 AG |
3644 | |
3645 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
3646 | if (!mdev) | |
3647 | return -EIO; | |
b411b363 PR |
3648 | |
3649 | wait_event(mdev->misc_wait, | |
3650 | mdev->state.conn == C_WF_SYNC_UUID || | |
c4752ef1 | 3651 | mdev->state.conn == C_BEHIND || |
b411b363 PR |
3652 | mdev->state.conn < C_CONNECTED || |
3653 | mdev->state.disk < D_NEGOTIATING); | |
3654 | ||
3655 | /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */ | |
3656 | ||
b411b363 PR |
3657 | /* Here the _drbd_uuid_ functions are right, current should |
3658 | _not_ be rotated into the history */ | |
3659 | if (get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
3660 | _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid)); | |
3661 | _drbd_uuid_set(mdev, UI_BITMAP, 0UL); | |
3662 | ||
62b0da3a | 3663 | drbd_print_uuids(mdev, "updated sync uuid"); |
b411b363 PR |
3664 | drbd_start_resync(mdev, C_SYNC_TARGET); |
3665 | ||
3666 | put_ldev(mdev); | |
3667 | } else | |
3668 | dev_err(DEV, "Ignoring SyncUUID packet!\n"); | |
3669 | ||
82bc0194 | 3670 | return 0; |
b411b363 PR |
3671 | } |
3672 | ||
2c46407d AG |
3673 | /** |
3674 | * receive_bitmap_plain | |
3675 | * | |
3676 | * Return 0 when done, 1 when another iteration is needed, and a negative error | |
3677 | * code upon failure. | |
3678 | */ | |
3679 | static int | |
50d0b1ad | 3680 | receive_bitmap_plain(struct drbd_conf *mdev, unsigned int size, |
e658983a | 3681 | unsigned long *p, struct bm_xfer_ctx *c) |
b411b363 | 3682 | { |
50d0b1ad AG |
3683 | unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - |
3684 | drbd_header_size(mdev->tconn); | |
e658983a | 3685 | unsigned int num_words = min_t(size_t, data_size / sizeof(*p), |
50d0b1ad | 3686 | c->bm_words - c->word_offset); |
e658983a | 3687 | unsigned int want = num_words * sizeof(*p); |
2c46407d | 3688 | int err; |
b411b363 | 3689 | |
50d0b1ad AG |
3690 | if (want != size) { |
3691 | dev_err(DEV, "%s:want (%u) != size (%u)\n", __func__, want, size); | |
2c46407d | 3692 | return -EIO; |
b411b363 PR |
3693 | } |
3694 | if (want == 0) | |
2c46407d | 3695 | return 0; |
e658983a | 3696 | err = drbd_recv_all(mdev->tconn, p, want); |
82bc0194 | 3697 | if (err) |
2c46407d | 3698 | return err; |
b411b363 | 3699 | |
e658983a | 3700 | drbd_bm_merge_lel(mdev, c->word_offset, num_words, p); |
b411b363 PR |
3701 | |
3702 | c->word_offset += num_words; | |
3703 | c->bit_offset = c->word_offset * BITS_PER_LONG; | |
3704 | if (c->bit_offset > c->bm_bits) | |
3705 | c->bit_offset = c->bm_bits; | |
3706 | ||
2c46407d | 3707 | return 1; |
b411b363 PR |
3708 | } |
3709 | ||
a02d1240 AG |
3710 | static enum drbd_bitmap_code dcbp_get_code(struct p_compressed_bm *p) |
3711 | { | |
3712 | return (enum drbd_bitmap_code)(p->encoding & 0x0f); | |
3713 | } | |
3714 | ||
3715 | static int dcbp_get_start(struct p_compressed_bm *p) | |
3716 | { | |
3717 | return (p->encoding & 0x80) != 0; | |
3718 | } | |
3719 | ||
3720 | static int dcbp_get_pad_bits(struct p_compressed_bm *p) | |
3721 | { | |
3722 | return (p->encoding >> 4) & 0x7; | |
3723 | } | |
3724 | ||
2c46407d AG |
3725 | /** |
3726 | * recv_bm_rle_bits | |
3727 | * | |
3728 | * Return 0 when done, 1 when another iteration is needed, and a negative error | |
3729 | * code upon failure. | |
3730 | */ | |
3731 | static int | |
b411b363 PR |
3732 | recv_bm_rle_bits(struct drbd_conf *mdev, |
3733 | struct p_compressed_bm *p, | |
c6d25cfe PR |
3734 | struct bm_xfer_ctx *c, |
3735 | unsigned int len) | |
b411b363 PR |
3736 | { |
3737 | struct bitstream bs; | |
3738 | u64 look_ahead; | |
3739 | u64 rl; | |
3740 | u64 tmp; | |
3741 | unsigned long s = c->bit_offset; | |
3742 | unsigned long e; | |
a02d1240 | 3743 | int toggle = dcbp_get_start(p); |
b411b363 PR |
3744 | int have; |
3745 | int bits; | |
3746 | ||
a02d1240 | 3747 | bitstream_init(&bs, p->code, len, dcbp_get_pad_bits(p)); |
b411b363 PR |
3748 | |
3749 | bits = bitstream_get_bits(&bs, &look_ahead, 64); | |
3750 | if (bits < 0) | |
2c46407d | 3751 | return -EIO; |
b411b363 PR |
3752 | |
3753 | for (have = bits; have > 0; s += rl, toggle = !toggle) { | |
3754 | bits = vli_decode_bits(&rl, look_ahead); | |
3755 | if (bits <= 0) | |
2c46407d | 3756 | return -EIO; |
b411b363 PR |
3757 | |
3758 | if (toggle) { | |
3759 | e = s + rl -1; | |
3760 | if (e >= c->bm_bits) { | |
3761 | dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); | |
2c46407d | 3762 | return -EIO; |
b411b363 PR |
3763 | } |
3764 | _drbd_bm_set_bits(mdev, s, e); | |
3765 | } | |
3766 | ||
3767 | if (have < bits) { | |
3768 | dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", | |
3769 | have, bits, look_ahead, | |
3770 | (unsigned int)(bs.cur.b - p->code), | |
3771 | (unsigned int)bs.buf_len); | |
2c46407d | 3772 | return -EIO; |
b411b363 PR |
3773 | } |
3774 | look_ahead >>= bits; | |
3775 | have -= bits; | |
3776 | ||
3777 | bits = bitstream_get_bits(&bs, &tmp, 64 - have); | |
3778 | if (bits < 0) | |
2c46407d | 3779 | return -EIO; |
b411b363 PR |
3780 | look_ahead |= tmp << have; |
3781 | have += bits; | |
3782 | } | |
3783 | ||
3784 | c->bit_offset = s; | |
3785 | bm_xfer_ctx_bit_to_word_offset(c); | |
3786 | ||
2c46407d | 3787 | return (s != c->bm_bits); |
b411b363 PR |
3788 | } |
3789 | ||
2c46407d AG |
3790 | /** |
3791 | * decode_bitmap_c | |
3792 | * | |
3793 | * Return 0 when done, 1 when another iteration is needed, and a negative error | |
3794 | * code upon failure. | |
3795 | */ | |
3796 | static int | |
b411b363 PR |
3797 | decode_bitmap_c(struct drbd_conf *mdev, |
3798 | struct p_compressed_bm *p, | |
c6d25cfe PR |
3799 | struct bm_xfer_ctx *c, |
3800 | unsigned int len) | |
b411b363 | 3801 | { |
a02d1240 | 3802 | if (dcbp_get_code(p) == RLE_VLI_Bits) |
e658983a | 3803 | return recv_bm_rle_bits(mdev, p, c, len - sizeof(*p)); |
b411b363 PR |
3804 | |
3805 | /* other variants had been implemented for evaluation, | |
3806 | * but have been dropped as this one turned out to be "best" | |
3807 | * during all our tests. */ | |
3808 | ||
3809 | dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding); | |
38fa9988 | 3810 | conn_request_state(mdev->tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); |
2c46407d | 3811 | return -EIO; |
b411b363 PR |
3812 | } |
3813 | ||
3814 | void INFO_bm_xfer_stats(struct drbd_conf *mdev, | |
3815 | const char *direction, struct bm_xfer_ctx *c) | |
3816 | { | |
3817 | /* what would it take to transfer it "plaintext" */ | |
50d0b1ad AG |
3818 | unsigned int header_size = drbd_header_size(mdev->tconn); |
3819 | unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - header_size; | |
3820 | unsigned int plain = | |
3821 | header_size * (DIV_ROUND_UP(c->bm_words, data_size) + 1) + | |
3822 | c->bm_words * sizeof(unsigned long); | |
3823 | unsigned int total = c->bytes[0] + c->bytes[1]; | |
3824 | unsigned int r; | |
b411b363 PR |
3825 | |
3826 | /* total can not be zero. but just in case: */ | |
3827 | if (total == 0) | |
3828 | return; | |
3829 | ||
3830 | /* don't report if not compressed */ | |
3831 | if (total >= plain) | |
3832 | return; | |
3833 | ||
3834 | /* total < plain. check for overflow, still */ | |
3835 | r = (total > UINT_MAX/1000) ? (total / (plain/1000)) | |
3836 | : (1000 * total / plain); | |
3837 | ||
3838 | if (r > 1000) | |
3839 | r = 1000; | |
3840 | ||
3841 | r = 1000 - r; | |
3842 | dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " | |
3843 | "total %u; compression: %u.%u%%\n", | |
3844 | direction, | |
3845 | c->bytes[1], c->packets[1], | |
3846 | c->bytes[0], c->packets[0], | |
3847 | total, r/10, r % 10); | |
3848 | } | |
3849 | ||
3850 | /* Since we are processing the bitfield from lower addresses to higher, | |
3851 | it does not matter if the process it in 32 bit chunks or 64 bit | |
3852 | chunks as long as it is little endian. (Understand it as byte stream, | |
3853 | beginning with the lowest byte...) If we would use big endian | |
3854 | we would need to process it from the highest address to the lowest, | |
3855 | in order to be agnostic to the 32 vs 64 bits issue. | |
3856 | ||
3857 | returns 0 on failure, 1 if we successfully received it. */ | |
4a76b161 | 3858 | static int receive_bitmap(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 3859 | { |
4a76b161 | 3860 | struct drbd_conf *mdev; |
b411b363 | 3861 | struct bm_xfer_ctx c; |
2c46407d | 3862 | int err; |
4a76b161 AG |
3863 | |
3864 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
3865 | if (!mdev) | |
3866 | return -EIO; | |
b411b363 | 3867 | |
20ceb2b2 LE |
3868 | drbd_bm_lock(mdev, "receive bitmap", BM_LOCKED_SET_ALLOWED); |
3869 | /* you are supposed to send additional out-of-sync information | |
3870 | * if you actually set bits during this phase */ | |
b411b363 | 3871 | |
b411b363 PR |
3872 | c = (struct bm_xfer_ctx) { |
3873 | .bm_bits = drbd_bm_bits(mdev), | |
3874 | .bm_words = drbd_bm_words(mdev), | |
3875 | }; | |
3876 | ||
2c46407d | 3877 | for(;;) { |
e658983a AG |
3878 | if (pi->cmd == P_BITMAP) |
3879 | err = receive_bitmap_plain(mdev, pi->size, pi->data, &c); | |
3880 | else if (pi->cmd == P_COMPRESSED_BITMAP) { | |
b411b363 PR |
3881 | /* MAYBE: sanity check that we speak proto >= 90, |
3882 | * and the feature is enabled! */ | |
e658983a | 3883 | struct p_compressed_bm *p = pi->data; |
b411b363 | 3884 | |
50d0b1ad | 3885 | if (pi->size > DRBD_SOCKET_BUFFER_SIZE - drbd_header_size(tconn)) { |
b411b363 | 3886 | dev_err(DEV, "ReportCBitmap packet too large\n"); |
82bc0194 | 3887 | err = -EIO; |
b411b363 PR |
3888 | goto out; |
3889 | } | |
e658983a | 3890 | if (pi->size <= sizeof(*p)) { |
e2857216 | 3891 | dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", pi->size); |
82bc0194 | 3892 | err = -EIO; |
78fcbdae | 3893 | goto out; |
b411b363 | 3894 | } |
e658983a AG |
3895 | err = drbd_recv_all(mdev->tconn, p, pi->size); |
3896 | if (err) | |
3897 | goto out; | |
e2857216 | 3898 | err = decode_bitmap_c(mdev, p, &c, pi->size); |
b411b363 | 3899 | } else { |
e2857216 | 3900 | dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", pi->cmd); |
82bc0194 | 3901 | err = -EIO; |
b411b363 PR |
3902 | goto out; |
3903 | } | |
3904 | ||
e2857216 | 3905 | c.packets[pi->cmd == P_BITMAP]++; |
50d0b1ad | 3906 | c.bytes[pi->cmd == P_BITMAP] += drbd_header_size(tconn) + pi->size; |
b411b363 | 3907 | |
2c46407d AG |
3908 | if (err <= 0) { |
3909 | if (err < 0) | |
3910 | goto out; | |
b411b363 | 3911 | break; |
2c46407d | 3912 | } |
e2857216 | 3913 | err = drbd_recv_header(mdev->tconn, pi); |
82bc0194 | 3914 | if (err) |
b411b363 | 3915 | goto out; |
2c46407d | 3916 | } |
b411b363 PR |
3917 | |
3918 | INFO_bm_xfer_stats(mdev, "receive", &c); | |
3919 | ||
3920 | if (mdev->state.conn == C_WF_BITMAP_T) { | |
de1f8e4a AG |
3921 | enum drbd_state_rv rv; |
3922 | ||
82bc0194 AG |
3923 | err = drbd_send_bitmap(mdev); |
3924 | if (err) | |
b411b363 PR |
3925 | goto out; |
3926 | /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ | |
de1f8e4a AG |
3927 | rv = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); |
3928 | D_ASSERT(rv == SS_SUCCESS); | |
b411b363 PR |
3929 | } else if (mdev->state.conn != C_WF_BITMAP_S) { |
3930 | /* admin may have requested C_DISCONNECTING, | |
3931 | * other threads may have noticed network errors */ | |
3932 | dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n", | |
3933 | drbd_conn_str(mdev->state.conn)); | |
3934 | } | |
82bc0194 | 3935 | err = 0; |
b411b363 | 3936 | |
b411b363 | 3937 | out: |
20ceb2b2 | 3938 | drbd_bm_unlock(mdev); |
82bc0194 | 3939 | if (!err && mdev->state.conn == C_WF_BITMAP_S) |
b411b363 | 3940 | drbd_start_resync(mdev, C_SYNC_SOURCE); |
82bc0194 | 3941 | return err; |
b411b363 PR |
3942 | } |
3943 | ||
4a76b161 | 3944 | static int receive_skip(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 3945 | { |
4a76b161 | 3946 | conn_warn(tconn, "skipping unknown optional packet type %d, l: %d!\n", |
e2857216 | 3947 | pi->cmd, pi->size); |
2de876ef | 3948 | |
4a76b161 | 3949 | return ignore_remaining_packet(tconn, pi); |
2de876ef PR |
3950 | } |
3951 | ||
4a76b161 | 3952 | static int receive_UnplugRemote(struct drbd_tconn *tconn, struct packet_info *pi) |
0ced55a3 | 3953 | { |
e7f52dfb LE |
3954 | /* Make sure we've acked all the TCP data associated |
3955 | * with the data requests being unplugged */ | |
4a76b161 | 3956 | drbd_tcp_quickack(tconn->data.socket); |
0ced55a3 | 3957 | |
82bc0194 | 3958 | return 0; |
0ced55a3 PR |
3959 | } |
3960 | ||
4a76b161 | 3961 | static int receive_out_of_sync(struct drbd_tconn *tconn, struct packet_info *pi) |
73a01a18 | 3962 | { |
4a76b161 | 3963 | struct drbd_conf *mdev; |
e658983a | 3964 | struct p_block_desc *p = pi->data; |
4a76b161 AG |
3965 | |
3966 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
3967 | if (!mdev) | |
3968 | return -EIO; | |
73a01a18 | 3969 | |
f735e363 LE |
3970 | switch (mdev->state.conn) { |
3971 | case C_WF_SYNC_UUID: | |
3972 | case C_WF_BITMAP_T: | |
3973 | case C_BEHIND: | |
3974 | break; | |
3975 | default: | |
3976 | dev_err(DEV, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n", | |
3977 | drbd_conn_str(mdev->state.conn)); | |
3978 | } | |
3979 | ||
73a01a18 PR |
3980 | drbd_set_out_of_sync(mdev, be64_to_cpu(p->sector), be32_to_cpu(p->blksize)); |
3981 | ||
82bc0194 | 3982 | return 0; |
73a01a18 PR |
3983 | } |
3984 | ||
02918be2 PR |
3985 | struct data_cmd { |
3986 | int expect_payload; | |
3987 | size_t pkt_size; | |
4a76b161 | 3988 | int (*fn)(struct drbd_tconn *, struct packet_info *); |
02918be2 PR |
3989 | }; |
3990 | ||
3991 | static struct data_cmd drbd_cmd_handler[] = { | |
4a76b161 AG |
3992 | [P_DATA] = { 1, sizeof(struct p_data), receive_Data }, |
3993 | [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply }, | |
3994 | [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } , | |
3995 | [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } , | |
e658983a AG |
3996 | [P_BITMAP] = { 1, 0, receive_bitmap } , |
3997 | [P_COMPRESSED_BITMAP] = { 1, 0, receive_bitmap } , | |
3998 | [P_UNPLUG_REMOTE] = { 0, 0, receive_UnplugRemote }, | |
4a76b161 AG |
3999 | [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, |
4000 | [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, | |
e658983a AG |
4001 | [P_SYNC_PARAM] = { 1, 0, receive_SyncParam }, |
4002 | [P_SYNC_PARAM89] = { 1, 0, receive_SyncParam }, | |
4a76b161 AG |
4003 | [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol }, |
4004 | [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids }, | |
4005 | [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes }, | |
4006 | [P_STATE] = { 0, sizeof(struct p_state), receive_state }, | |
4007 | [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state }, | |
4008 | [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid }, | |
4009 | [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, | |
4010 | [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest }, | |
4011 | [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest }, | |
4012 | [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip }, | |
4013 | [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync }, | |
4014 | [P_CONN_ST_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_conn_state }, | |
b411b363 PR |
4015 | }; |
4016 | ||
eefc2f7d | 4017 | static void drbdd(struct drbd_tconn *tconn) |
b411b363 | 4018 | { |
77351055 | 4019 | struct packet_info pi; |
02918be2 | 4020 | size_t shs; /* sub header size */ |
82bc0194 | 4021 | int err; |
b411b363 | 4022 | |
eefc2f7d | 4023 | while (get_t_state(&tconn->receiver) == RUNNING) { |
deebe195 AG |
4024 | struct data_cmd *cmd; |
4025 | ||
eefc2f7d | 4026 | drbd_thread_current_set_cpu(&tconn->receiver); |
69bc7bc3 | 4027 | if (drbd_recv_header(tconn, &pi)) |
02918be2 | 4028 | goto err_out; |
b411b363 | 4029 | |
deebe195 | 4030 | cmd = &drbd_cmd_handler[pi.cmd]; |
4a76b161 | 4031 | if (unlikely(pi.cmd >= ARRAY_SIZE(drbd_cmd_handler) || !cmd->fn)) { |
eefc2f7d | 4032 | conn_err(tconn, "unknown packet type %d, l: %d!\n", pi.cmd, pi.size); |
02918be2 | 4033 | goto err_out; |
0b33a916 | 4034 | } |
b411b363 | 4035 | |
e658983a AG |
4036 | shs = cmd->pkt_size; |
4037 | if (pi.size > shs && !cmd->expect_payload) { | |
eefc2f7d | 4038 | conn_err(tconn, "No payload expected %s l:%d\n", cmdname(pi.cmd), pi.size); |
02918be2 | 4039 | goto err_out; |
b411b363 | 4040 | } |
b411b363 | 4041 | |
c13f7e1a | 4042 | if (shs) { |
e658983a | 4043 | err = drbd_recv_all_warn(tconn, pi.data, shs); |
a5c31904 | 4044 | if (err) |
c13f7e1a | 4045 | goto err_out; |
e2857216 | 4046 | pi.size -= shs; |
c13f7e1a LE |
4047 | } |
4048 | ||
4a76b161 AG |
4049 | err = cmd->fn(tconn, &pi); |
4050 | if (err) { | |
9f5bdc33 AG |
4051 | conn_err(tconn, "error receiving %s, e: %d l: %d!\n", |
4052 | cmdname(pi.cmd), err, pi.size); | |
02918be2 | 4053 | goto err_out; |
b411b363 PR |
4054 | } |
4055 | } | |
82bc0194 | 4056 | return; |
b411b363 | 4057 | |
82bc0194 AG |
4058 | err_out: |
4059 | conn_request_state(tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); | |
b411b363 PR |
4060 | } |
4061 | ||
0e29d163 | 4062 | void conn_flush_workqueue(struct drbd_tconn *tconn) |
b411b363 PR |
4063 | { |
4064 | struct drbd_wq_barrier barr; | |
4065 | ||
4066 | barr.w.cb = w_prev_work_done; | |
0e29d163 | 4067 | barr.w.tconn = tconn; |
b411b363 | 4068 | init_completion(&barr.done); |
0e29d163 | 4069 | drbd_queue_work(&tconn->data.work, &barr.w); |
b411b363 PR |
4070 | wait_for_completion(&barr.done); |
4071 | } | |
4072 | ||
360cc740 | 4073 | static void drbd_disconnect(struct drbd_tconn *tconn) |
b411b363 | 4074 | { |
bbeb641c | 4075 | enum drbd_conns oc; |
b411b363 | 4076 | int rv = SS_UNKNOWN_ERROR; |
b411b363 | 4077 | |
bbeb641c | 4078 | if (tconn->cstate == C_STANDALONE) |
b411b363 | 4079 | return; |
b411b363 PR |
4080 | |
4081 | /* asender does not clean up anything. it must not interfere, either */ | |
360cc740 PR |
4082 | drbd_thread_stop(&tconn->asender); |
4083 | drbd_free_sock(tconn); | |
4084 | ||
4085 | idr_for_each(&tconn->volumes, drbd_disconnected, tconn); | |
360cc740 PR |
4086 | conn_info(tconn, "Connection closed\n"); |
4087 | ||
cb703454 PR |
4088 | if (conn_highest_role(tconn) == R_PRIMARY && conn_highest_pdsk(tconn) >= D_UNKNOWN) |
4089 | conn_try_outdate_peer_async(tconn); | |
4090 | ||
360cc740 | 4091 | spin_lock_irq(&tconn->req_lock); |
bbeb641c PR |
4092 | oc = tconn->cstate; |
4093 | if (oc >= C_UNCONNECTED) | |
4094 | rv = _conn_request_state(tconn, NS(conn, C_UNCONNECTED), CS_VERBOSE); | |
4095 | ||
360cc740 PR |
4096 | spin_unlock_irq(&tconn->req_lock); |
4097 | ||
bbeb641c | 4098 | if (oc == C_DISCONNECTING) { |
360cc740 PR |
4099 | wait_event(tconn->net_cnt_wait, atomic_read(&tconn->net_cnt) == 0); |
4100 | ||
4101 | crypto_free_hash(tconn->cram_hmac_tfm); | |
4102 | tconn->cram_hmac_tfm = NULL; | |
4103 | ||
4104 | kfree(tconn->net_conf); | |
4105 | tconn->net_conf = NULL; | |
bbeb641c | 4106 | conn_request_state(tconn, NS(conn, C_STANDALONE), CS_VERBOSE); |
360cc740 PR |
4107 | } |
4108 | } | |
4109 | ||
4110 | static int drbd_disconnected(int vnr, void *p, void *data) | |
4111 | { | |
4112 | struct drbd_conf *mdev = (struct drbd_conf *)p; | |
4113 | enum drbd_fencing_p fp; | |
4114 | unsigned int i; | |
b411b363 | 4115 | |
85719573 | 4116 | /* wait for current activity to cease. */ |
87eeee41 | 4117 | spin_lock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
4118 | _drbd_wait_ee_list_empty(mdev, &mdev->active_ee); |
4119 | _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee); | |
4120 | _drbd_wait_ee_list_empty(mdev, &mdev->read_ee); | |
87eeee41 | 4121 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
4122 | |
4123 | /* We do not have data structures that would allow us to | |
4124 | * get the rs_pending_cnt down to 0 again. | |
4125 | * * On C_SYNC_TARGET we do not have any data structures describing | |
4126 | * the pending RSDataRequest's we have sent. | |
4127 | * * On C_SYNC_SOURCE there is no data structure that tracks | |
4128 | * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. | |
4129 | * And no, it is not the sum of the reference counts in the | |
4130 | * resync_LRU. The resync_LRU tracks the whole operation including | |
4131 | * the disk-IO, while the rs_pending_cnt only tracks the blocks | |
4132 | * on the fly. */ | |
4133 | drbd_rs_cancel_all(mdev); | |
4134 | mdev->rs_total = 0; | |
4135 | mdev->rs_failed = 0; | |
4136 | atomic_set(&mdev->rs_pending_cnt, 0); | |
4137 | wake_up(&mdev->misc_wait); | |
4138 | ||
7fde2be9 PR |
4139 | del_timer(&mdev->request_timer); |
4140 | ||
b411b363 | 4141 | del_timer_sync(&mdev->resync_timer); |
b411b363 PR |
4142 | resync_timer_fn((unsigned long)mdev); |
4143 | ||
b411b363 PR |
4144 | /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, |
4145 | * w_make_resync_request etc. which may still be on the worker queue | |
4146 | * to be "canceled" */ | |
a21e9298 | 4147 | drbd_flush_workqueue(mdev); |
b411b363 | 4148 | |
a990be46 | 4149 | drbd_finish_peer_reqs(mdev); |
b411b363 PR |
4150 | |
4151 | kfree(mdev->p_uuid); | |
4152 | mdev->p_uuid = NULL; | |
4153 | ||
2aebfabb | 4154 | if (!drbd_suspended(mdev)) |
2f5cdd0b | 4155 | tl_clear(mdev->tconn); |
b411b363 | 4156 | |
b411b363 PR |
4157 | drbd_md_sync(mdev); |
4158 | ||
4159 | fp = FP_DONT_CARE; | |
4160 | if (get_ldev(mdev)) { | |
4161 | fp = mdev->ldev->dc.fencing; | |
4162 | put_ldev(mdev); | |
4163 | } | |
4164 | ||
20ceb2b2 LE |
4165 | /* serialize with bitmap writeout triggered by the state change, |
4166 | * if any. */ | |
4167 | wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags)); | |
4168 | ||
b411b363 PR |
4169 | /* tcp_close and release of sendpage pages can be deferred. I don't |
4170 | * want to use SO_LINGER, because apparently it can be deferred for | |
4171 | * more than 20 seconds (longest time I checked). | |
4172 | * | |
4173 | * Actually we don't care for exactly when the network stack does its | |
4174 | * put_page(), but release our reference on these pages right here. | |
4175 | */ | |
7721f567 | 4176 | i = drbd_free_peer_reqs(mdev, &mdev->net_ee); |
b411b363 PR |
4177 | if (i) |
4178 | dev_info(DEV, "net_ee not empty, killed %u entries\n", i); | |
435f0740 LE |
4179 | i = atomic_read(&mdev->pp_in_use_by_net); |
4180 | if (i) | |
4181 | dev_info(DEV, "pp_in_use_by_net = %d, expected 0\n", i); | |
b411b363 PR |
4182 | i = atomic_read(&mdev->pp_in_use); |
4183 | if (i) | |
45bb912b | 4184 | dev_info(DEV, "pp_in_use = %d, expected 0\n", i); |
b411b363 PR |
4185 | |
4186 | D_ASSERT(list_empty(&mdev->read_ee)); | |
4187 | D_ASSERT(list_empty(&mdev->active_ee)); | |
4188 | D_ASSERT(list_empty(&mdev->sync_ee)); | |
4189 | D_ASSERT(list_empty(&mdev->done_ee)); | |
4190 | ||
4191 | /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ | |
4192 | atomic_set(&mdev->current_epoch->epoch_size, 0); | |
4193 | D_ASSERT(list_empty(&mdev->current_epoch->list)); | |
360cc740 PR |
4194 | |
4195 | return 0; | |
b411b363 PR |
4196 | } |
4197 | ||
4198 | /* | |
4199 | * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version | |
4200 | * we can agree on is stored in agreed_pro_version. | |
4201 | * | |
4202 | * feature flags and the reserved array should be enough room for future | |
4203 | * enhancements of the handshake protocol, and possible plugins... | |
4204 | * | |
4205 | * for now, they are expected to be zero, but ignored. | |
4206 | */ | |
6038178e | 4207 | static int drbd_send_features(struct drbd_tconn *tconn) |
b411b363 | 4208 | { |
9f5bdc33 AG |
4209 | struct drbd_socket *sock; |
4210 | struct p_connection_features *p; | |
b411b363 | 4211 | |
9f5bdc33 AG |
4212 | sock = &tconn->data; |
4213 | p = conn_prepare_command(tconn, sock); | |
4214 | if (!p) | |
e8d17b01 | 4215 | return -EIO; |
b411b363 PR |
4216 | memset(p, 0, sizeof(*p)); |
4217 | p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); | |
4218 | p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); | |
9f5bdc33 | 4219 | return conn_send_command(tconn, sock, P_CONNECTION_FEATURES, sizeof(*p), NULL, 0); |
b411b363 PR |
4220 | } |
4221 | ||
4222 | /* | |
4223 | * return values: | |
4224 | * 1 yes, we have a valid connection | |
4225 | * 0 oops, did not work out, please try again | |
4226 | * -1 peer talks different language, | |
4227 | * no point in trying again, please go standalone. | |
4228 | */ | |
6038178e | 4229 | static int drbd_do_features(struct drbd_tconn *tconn) |
b411b363 | 4230 | { |
65d11ed6 | 4231 | /* ASSERT current == tconn->receiver ... */ |
e658983a AG |
4232 | struct p_connection_features *p; |
4233 | const int expect = sizeof(struct p_connection_features); | |
77351055 | 4234 | struct packet_info pi; |
a5c31904 | 4235 | int err; |
b411b363 | 4236 | |
6038178e | 4237 | err = drbd_send_features(tconn); |
e8d17b01 | 4238 | if (err) |
b411b363 PR |
4239 | return 0; |
4240 | ||
69bc7bc3 AG |
4241 | err = drbd_recv_header(tconn, &pi); |
4242 | if (err) | |
b411b363 PR |
4243 | return 0; |
4244 | ||
6038178e AG |
4245 | if (pi.cmd != P_CONNECTION_FEATURES) { |
4246 | conn_err(tconn, "expected ConnectionFeatures packet, received: %s (0x%04x)\n", | |
77351055 | 4247 | cmdname(pi.cmd), pi.cmd); |
b411b363 PR |
4248 | return -1; |
4249 | } | |
4250 | ||
77351055 | 4251 | if (pi.size != expect) { |
6038178e | 4252 | conn_err(tconn, "expected ConnectionFeatures length: %u, received: %u\n", |
77351055 | 4253 | expect, pi.size); |
b411b363 PR |
4254 | return -1; |
4255 | } | |
4256 | ||
e658983a AG |
4257 | p = pi.data; |
4258 | err = drbd_recv_all_warn(tconn, p, expect); | |
a5c31904 | 4259 | if (err) |
b411b363 | 4260 | return 0; |
b411b363 | 4261 | |
b411b363 PR |
4262 | p->protocol_min = be32_to_cpu(p->protocol_min); |
4263 | p->protocol_max = be32_to_cpu(p->protocol_max); | |
4264 | if (p->protocol_max == 0) | |
4265 | p->protocol_max = p->protocol_min; | |
4266 | ||
4267 | if (PRO_VERSION_MAX < p->protocol_min || | |
4268 | PRO_VERSION_MIN > p->protocol_max) | |
4269 | goto incompat; | |
4270 | ||
65d11ed6 | 4271 | tconn->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); |
b411b363 | 4272 | |
65d11ed6 PR |
4273 | conn_info(tconn, "Handshake successful: " |
4274 | "Agreed network protocol version %d\n", tconn->agreed_pro_version); | |
b411b363 PR |
4275 | |
4276 | return 1; | |
4277 | ||
4278 | incompat: | |
65d11ed6 | 4279 | conn_err(tconn, "incompatible DRBD dialects: " |
b411b363 PR |
4280 | "I support %d-%d, peer supports %d-%d\n", |
4281 | PRO_VERSION_MIN, PRO_VERSION_MAX, | |
4282 | p->protocol_min, p->protocol_max); | |
4283 | return -1; | |
4284 | } | |
4285 | ||
4286 | #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) | |
13e6037d | 4287 | static int drbd_do_auth(struct drbd_tconn *tconn) |
b411b363 PR |
4288 | { |
4289 | dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); | |
4290 | dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); | |
b10d96cb | 4291 | return -1; |
b411b363 PR |
4292 | } |
4293 | #else | |
4294 | #define CHALLENGE_LEN 64 | |
b10d96cb JT |
4295 | |
4296 | /* Return value: | |
4297 | 1 - auth succeeded, | |
4298 | 0 - failed, try again (network error), | |
4299 | -1 - auth failed, don't try again. | |
4300 | */ | |
4301 | ||
13e6037d | 4302 | static int drbd_do_auth(struct drbd_tconn *tconn) |
b411b363 | 4303 | { |
9f5bdc33 | 4304 | struct drbd_socket *sock; |
b411b363 PR |
4305 | char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ |
4306 | struct scatterlist sg; | |
4307 | char *response = NULL; | |
4308 | char *right_response = NULL; | |
4309 | char *peers_ch = NULL; | |
13e6037d | 4310 | unsigned int key_len = strlen(tconn->net_conf->shared_secret); |
b411b363 PR |
4311 | unsigned int resp_size; |
4312 | struct hash_desc desc; | |
77351055 | 4313 | struct packet_info pi; |
69bc7bc3 | 4314 | int err, rv; |
b411b363 | 4315 | |
9f5bdc33 AG |
4316 | /* FIXME: Put the challenge/response into the preallocated socket buffer. */ |
4317 | ||
13e6037d | 4318 | desc.tfm = tconn->cram_hmac_tfm; |
b411b363 PR |
4319 | desc.flags = 0; |
4320 | ||
13e6037d PR |
4321 | rv = crypto_hash_setkey(tconn->cram_hmac_tfm, |
4322 | (u8 *)tconn->net_conf->shared_secret, key_len); | |
b411b363 | 4323 | if (rv) { |
13e6037d | 4324 | conn_err(tconn, "crypto_hash_setkey() failed with %d\n", rv); |
b10d96cb | 4325 | rv = -1; |
b411b363 PR |
4326 | goto fail; |
4327 | } | |
4328 | ||
4329 | get_random_bytes(my_challenge, CHALLENGE_LEN); | |
4330 | ||
9f5bdc33 AG |
4331 | sock = &tconn->data; |
4332 | if (!conn_prepare_command(tconn, sock)) { | |
4333 | rv = 0; | |
4334 | goto fail; | |
4335 | } | |
e658983a | 4336 | rv = !conn_send_command(tconn, sock, P_AUTH_CHALLENGE, 0, |
9f5bdc33 | 4337 | my_challenge, CHALLENGE_LEN); |
b411b363 PR |
4338 | if (!rv) |
4339 | goto fail; | |
4340 | ||
69bc7bc3 AG |
4341 | err = drbd_recv_header(tconn, &pi); |
4342 | if (err) { | |
4343 | rv = 0; | |
b411b363 | 4344 | goto fail; |
69bc7bc3 | 4345 | } |
b411b363 | 4346 | |
77351055 | 4347 | if (pi.cmd != P_AUTH_CHALLENGE) { |
13e6037d | 4348 | conn_err(tconn, "expected AuthChallenge packet, received: %s (0x%04x)\n", |
77351055 | 4349 | cmdname(pi.cmd), pi.cmd); |
b411b363 PR |
4350 | rv = 0; |
4351 | goto fail; | |
4352 | } | |
4353 | ||
77351055 | 4354 | if (pi.size > CHALLENGE_LEN * 2) { |
13e6037d | 4355 | conn_err(tconn, "expected AuthChallenge payload too big.\n"); |
b10d96cb | 4356 | rv = -1; |
b411b363 PR |
4357 | goto fail; |
4358 | } | |
4359 | ||
77351055 | 4360 | peers_ch = kmalloc(pi.size, GFP_NOIO); |
b411b363 | 4361 | if (peers_ch == NULL) { |
13e6037d | 4362 | conn_err(tconn, "kmalloc of peers_ch failed\n"); |
b10d96cb | 4363 | rv = -1; |
b411b363 PR |
4364 | goto fail; |
4365 | } | |
4366 | ||
a5c31904 AG |
4367 | err = drbd_recv_all_warn(tconn, peers_ch, pi.size); |
4368 | if (err) { | |
b411b363 PR |
4369 | rv = 0; |
4370 | goto fail; | |
4371 | } | |
4372 | ||
13e6037d | 4373 | resp_size = crypto_hash_digestsize(tconn->cram_hmac_tfm); |
b411b363 PR |
4374 | response = kmalloc(resp_size, GFP_NOIO); |
4375 | if (response == NULL) { | |
13e6037d | 4376 | conn_err(tconn, "kmalloc of response failed\n"); |
b10d96cb | 4377 | rv = -1; |
b411b363 PR |
4378 | goto fail; |
4379 | } | |
4380 | ||
4381 | sg_init_table(&sg, 1); | |
77351055 | 4382 | sg_set_buf(&sg, peers_ch, pi.size); |
b411b363 PR |
4383 | |
4384 | rv = crypto_hash_digest(&desc, &sg, sg.length, response); | |
4385 | if (rv) { | |
13e6037d | 4386 | conn_err(tconn, "crypto_hash_digest() failed with %d\n", rv); |
b10d96cb | 4387 | rv = -1; |
b411b363 PR |
4388 | goto fail; |
4389 | } | |
4390 | ||
9f5bdc33 AG |
4391 | if (!conn_prepare_command(tconn, sock)) { |
4392 | rv = 0; | |
4393 | goto fail; | |
4394 | } | |
e658983a | 4395 | rv = !conn_send_command(tconn, sock, P_AUTH_RESPONSE, 0, |
9f5bdc33 | 4396 | response, resp_size); |
b411b363 PR |
4397 | if (!rv) |
4398 | goto fail; | |
4399 | ||
69bc7bc3 AG |
4400 | err = drbd_recv_header(tconn, &pi); |
4401 | if (err) { | |
4402 | rv = 0; | |
b411b363 | 4403 | goto fail; |
69bc7bc3 | 4404 | } |
b411b363 | 4405 | |
77351055 | 4406 | if (pi.cmd != P_AUTH_RESPONSE) { |
13e6037d | 4407 | conn_err(tconn, "expected AuthResponse packet, received: %s (0x%04x)\n", |
77351055 | 4408 | cmdname(pi.cmd), pi.cmd); |
b411b363 PR |
4409 | rv = 0; |
4410 | goto fail; | |
4411 | } | |
4412 | ||
77351055 | 4413 | if (pi.size != resp_size) { |
13e6037d | 4414 | conn_err(tconn, "expected AuthResponse payload of wrong size\n"); |
b411b363 PR |
4415 | rv = 0; |
4416 | goto fail; | |
4417 | } | |
4418 | ||
a5c31904 AG |
4419 | err = drbd_recv_all_warn(tconn, response , resp_size); |
4420 | if (err) { | |
b411b363 PR |
4421 | rv = 0; |
4422 | goto fail; | |
4423 | } | |
4424 | ||
4425 | right_response = kmalloc(resp_size, GFP_NOIO); | |
2d1ee87d | 4426 | if (right_response == NULL) { |
13e6037d | 4427 | conn_err(tconn, "kmalloc of right_response failed\n"); |
b10d96cb | 4428 | rv = -1; |
b411b363 PR |
4429 | goto fail; |
4430 | } | |
4431 | ||
4432 | sg_set_buf(&sg, my_challenge, CHALLENGE_LEN); | |
4433 | ||
4434 | rv = crypto_hash_digest(&desc, &sg, sg.length, right_response); | |
4435 | if (rv) { | |
13e6037d | 4436 | conn_err(tconn, "crypto_hash_digest() failed with %d\n", rv); |
b10d96cb | 4437 | rv = -1; |
b411b363 PR |
4438 | goto fail; |
4439 | } | |
4440 | ||
4441 | rv = !memcmp(response, right_response, resp_size); | |
4442 | ||
4443 | if (rv) | |
13e6037d PR |
4444 | conn_info(tconn, "Peer authenticated using %d bytes of '%s' HMAC\n", |
4445 | resp_size, tconn->net_conf->cram_hmac_alg); | |
b10d96cb JT |
4446 | else |
4447 | rv = -1; | |
b411b363 PR |
4448 | |
4449 | fail: | |
4450 | kfree(peers_ch); | |
4451 | kfree(response); | |
4452 | kfree(right_response); | |
4453 | ||
4454 | return rv; | |
4455 | } | |
4456 | #endif | |
4457 | ||
4458 | int drbdd_init(struct drbd_thread *thi) | |
4459 | { | |
392c8801 | 4460 | struct drbd_tconn *tconn = thi->tconn; |
b411b363 PR |
4461 | int h; |
4462 | ||
4d641dd7 | 4463 | conn_info(tconn, "receiver (re)started\n"); |
b411b363 PR |
4464 | |
4465 | do { | |
4d641dd7 | 4466 | h = drbd_connect(tconn); |
b411b363 | 4467 | if (h == 0) { |
4d641dd7 | 4468 | drbd_disconnect(tconn); |
20ee6390 | 4469 | schedule_timeout_interruptible(HZ); |
b411b363 PR |
4470 | } |
4471 | if (h == -1) { | |
4d641dd7 | 4472 | conn_warn(tconn, "Discarding network configuration.\n"); |
bbeb641c | 4473 | conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 PR |
4474 | } |
4475 | } while (h == 0); | |
4476 | ||
4477 | if (h > 0) { | |
4d641dd7 PR |
4478 | if (get_net_conf(tconn)) { |
4479 | drbdd(tconn); | |
4480 | put_net_conf(tconn); | |
b411b363 PR |
4481 | } |
4482 | } | |
4483 | ||
4d641dd7 | 4484 | drbd_disconnect(tconn); |
b411b363 | 4485 | |
4d641dd7 | 4486 | conn_info(tconn, "receiver terminated\n"); |
b411b363 PR |
4487 | return 0; |
4488 | } | |
4489 | ||
4490 | /* ********* acknowledge sender ******** */ | |
4491 | ||
e05e1e59 | 4492 | static int got_conn_RqSReply(struct drbd_tconn *tconn, struct packet_info *pi) |
e4f78ede | 4493 | { |
e658983a | 4494 | struct p_req_state_reply *p = pi->data; |
e4f78ede PR |
4495 | int retcode = be32_to_cpu(p->retcode); |
4496 | ||
4497 | if (retcode >= SS_SUCCESS) { | |
4498 | set_bit(CONN_WD_ST_CHG_OKAY, &tconn->flags); | |
4499 | } else { | |
4500 | set_bit(CONN_WD_ST_CHG_FAIL, &tconn->flags); | |
4501 | conn_err(tconn, "Requested state change failed by peer: %s (%d)\n", | |
4502 | drbd_set_st_err_str(retcode), retcode); | |
4503 | } | |
4504 | wake_up(&tconn->ping_wait); | |
4505 | ||
2735a594 | 4506 | return 0; |
e4f78ede PR |
4507 | } |
4508 | ||
1952e916 | 4509 | static int got_RqSReply(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4510 | { |
1952e916 | 4511 | struct drbd_conf *mdev; |
e658983a | 4512 | struct p_req_state_reply *p = pi->data; |
b411b363 PR |
4513 | int retcode = be32_to_cpu(p->retcode); |
4514 | ||
1952e916 AG |
4515 | mdev = vnr_to_mdev(tconn, pi->vnr); |
4516 | if (!mdev) | |
2735a594 | 4517 | return -EIO; |
1952e916 | 4518 | |
e4f78ede PR |
4519 | if (retcode >= SS_SUCCESS) { |
4520 | set_bit(CL_ST_CHG_SUCCESS, &mdev->flags); | |
4521 | } else { | |
4522 | set_bit(CL_ST_CHG_FAIL, &mdev->flags); | |
4523 | dev_err(DEV, "Requested state change failed by peer: %s (%d)\n", | |
4524 | drbd_set_st_err_str(retcode), retcode); | |
b411b363 | 4525 | } |
e4f78ede PR |
4526 | wake_up(&mdev->state_wait); |
4527 | ||
2735a594 | 4528 | return 0; |
b411b363 PR |
4529 | } |
4530 | ||
e05e1e59 | 4531 | static int got_Ping(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4532 | { |
2735a594 | 4533 | return drbd_send_ping_ack(tconn); |
b411b363 PR |
4534 | |
4535 | } | |
4536 | ||
e05e1e59 | 4537 | static int got_PingAck(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 PR |
4538 | { |
4539 | /* restore idle timeout */ | |
2a67d8b9 PR |
4540 | tconn->meta.socket->sk->sk_rcvtimeo = tconn->net_conf->ping_int*HZ; |
4541 | if (!test_and_set_bit(GOT_PING_ACK, &tconn->flags)) | |
4542 | wake_up(&tconn->ping_wait); | |
b411b363 | 4543 | |
2735a594 | 4544 | return 0; |
b411b363 PR |
4545 | } |
4546 | ||
1952e916 | 4547 | static int got_IsInSync(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4548 | { |
1952e916 | 4549 | struct drbd_conf *mdev; |
e658983a | 4550 | struct p_block_ack *p = pi->data; |
b411b363 PR |
4551 | sector_t sector = be64_to_cpu(p->sector); |
4552 | int blksize = be32_to_cpu(p->blksize); | |
4553 | ||
1952e916 AG |
4554 | mdev = vnr_to_mdev(tconn, pi->vnr); |
4555 | if (!mdev) | |
2735a594 | 4556 | return -EIO; |
1952e916 | 4557 | |
31890f4a | 4558 | D_ASSERT(mdev->tconn->agreed_pro_version >= 89); |
b411b363 PR |
4559 | |
4560 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
4561 | ||
1d53f09e LE |
4562 | if (get_ldev(mdev)) { |
4563 | drbd_rs_complete_io(mdev, sector); | |
4564 | drbd_set_in_sync(mdev, sector, blksize); | |
4565 | /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ | |
4566 | mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); | |
4567 | put_ldev(mdev); | |
4568 | } | |
b411b363 | 4569 | dec_rs_pending(mdev); |
778f271d | 4570 | atomic_add(blksize >> 9, &mdev->rs_sect_in); |
b411b363 | 4571 | |
2735a594 | 4572 | return 0; |
b411b363 PR |
4573 | } |
4574 | ||
bc9c5c41 AG |
4575 | static int |
4576 | validate_req_change_req_state(struct drbd_conf *mdev, u64 id, sector_t sector, | |
4577 | struct rb_root *root, const char *func, | |
4578 | enum drbd_req_event what, bool missing_ok) | |
b411b363 PR |
4579 | { |
4580 | struct drbd_request *req; | |
4581 | struct bio_and_error m; | |
4582 | ||
87eeee41 | 4583 | spin_lock_irq(&mdev->tconn->req_lock); |
bc9c5c41 | 4584 | req = find_request(mdev, root, id, sector, missing_ok, func); |
b411b363 | 4585 | if (unlikely(!req)) { |
87eeee41 | 4586 | spin_unlock_irq(&mdev->tconn->req_lock); |
85997675 | 4587 | return -EIO; |
b411b363 PR |
4588 | } |
4589 | __req_mod(req, what, &m); | |
87eeee41 | 4590 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
4591 | |
4592 | if (m.bio) | |
4593 | complete_master_bio(mdev, &m); | |
85997675 | 4594 | return 0; |
b411b363 PR |
4595 | } |
4596 | ||
1952e916 | 4597 | static int got_BlockAck(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4598 | { |
1952e916 | 4599 | struct drbd_conf *mdev; |
e658983a | 4600 | struct p_block_ack *p = pi->data; |
b411b363 PR |
4601 | sector_t sector = be64_to_cpu(p->sector); |
4602 | int blksize = be32_to_cpu(p->blksize); | |
4603 | enum drbd_req_event what; | |
4604 | ||
1952e916 AG |
4605 | mdev = vnr_to_mdev(tconn, pi->vnr); |
4606 | if (!mdev) | |
2735a594 | 4607 | return -EIO; |
1952e916 | 4608 | |
b411b363 PR |
4609 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); |
4610 | ||
579b57ed | 4611 | if (p->block_id == ID_SYNCER) { |
b411b363 PR |
4612 | drbd_set_in_sync(mdev, sector, blksize); |
4613 | dec_rs_pending(mdev); | |
2735a594 | 4614 | return 0; |
b411b363 | 4615 | } |
e05e1e59 | 4616 | switch (pi->cmd) { |
b411b363 | 4617 | case P_RS_WRITE_ACK: |
89e58e75 | 4618 | D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C); |
8554df1c | 4619 | what = WRITE_ACKED_BY_PEER_AND_SIS; |
b411b363 PR |
4620 | break; |
4621 | case P_WRITE_ACK: | |
89e58e75 | 4622 | D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C); |
8554df1c | 4623 | what = WRITE_ACKED_BY_PEER; |
b411b363 PR |
4624 | break; |
4625 | case P_RECV_ACK: | |
89e58e75 | 4626 | D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_B); |
8554df1c | 4627 | what = RECV_ACKED_BY_PEER; |
b411b363 | 4628 | break; |
7be8da07 | 4629 | case P_DISCARD_WRITE: |
89e58e75 | 4630 | D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C); |
7be8da07 AG |
4631 | what = DISCARD_WRITE; |
4632 | break; | |
4633 | case P_RETRY_WRITE: | |
4634 | D_ASSERT(mdev->tconn->net_conf->wire_protocol == DRBD_PROT_C); | |
4635 | what = POSTPONE_WRITE; | |
b411b363 PR |
4636 | break; |
4637 | default: | |
2735a594 | 4638 | BUG(); |
b411b363 PR |
4639 | } |
4640 | ||
2735a594 AG |
4641 | return validate_req_change_req_state(mdev, p->block_id, sector, |
4642 | &mdev->write_requests, __func__, | |
4643 | what, false); | |
b411b363 PR |
4644 | } |
4645 | ||
1952e916 | 4646 | static int got_NegAck(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4647 | { |
1952e916 | 4648 | struct drbd_conf *mdev; |
e658983a | 4649 | struct p_block_ack *p = pi->data; |
b411b363 | 4650 | sector_t sector = be64_to_cpu(p->sector); |
2deb8336 | 4651 | int size = be32_to_cpu(p->blksize); |
1952e916 AG |
4652 | bool missing_ok = tconn->net_conf->wire_protocol == DRBD_PROT_A || |
4653 | tconn->net_conf->wire_protocol == DRBD_PROT_B; | |
85997675 | 4654 | int err; |
b411b363 | 4655 | |
1952e916 AG |
4656 | mdev = vnr_to_mdev(tconn, pi->vnr); |
4657 | if (!mdev) | |
2735a594 | 4658 | return -EIO; |
1952e916 | 4659 | |
b411b363 PR |
4660 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); |
4661 | ||
579b57ed | 4662 | if (p->block_id == ID_SYNCER) { |
b411b363 PR |
4663 | dec_rs_pending(mdev); |
4664 | drbd_rs_failed_io(mdev, sector, size); | |
2735a594 | 4665 | return 0; |
b411b363 | 4666 | } |
2deb8336 | 4667 | |
85997675 AG |
4668 | err = validate_req_change_req_state(mdev, p->block_id, sector, |
4669 | &mdev->write_requests, __func__, | |
4670 | NEG_ACKED, missing_ok); | |
4671 | if (err) { | |
c3afd8f5 AG |
4672 | /* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs. |
4673 | The master bio might already be completed, therefore the | |
4674 | request is no longer in the collision hash. */ | |
4675 | /* In Protocol B we might already have got a P_RECV_ACK | |
4676 | but then get a P_NEG_ACK afterwards. */ | |
4677 | if (!missing_ok) | |
2735a594 | 4678 | return err; |
c3afd8f5 | 4679 | drbd_set_out_of_sync(mdev, sector, size); |
2deb8336 | 4680 | } |
2735a594 | 4681 | return 0; |
b411b363 PR |
4682 | } |
4683 | ||
1952e916 | 4684 | static int got_NegDReply(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4685 | { |
1952e916 | 4686 | struct drbd_conf *mdev; |
e658983a | 4687 | struct p_block_ack *p = pi->data; |
b411b363 PR |
4688 | sector_t sector = be64_to_cpu(p->sector); |
4689 | ||
1952e916 AG |
4690 | mdev = vnr_to_mdev(tconn, pi->vnr); |
4691 | if (!mdev) | |
2735a594 | 4692 | return -EIO; |
1952e916 | 4693 | |
b411b363 | 4694 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); |
7be8da07 | 4695 | |
b411b363 PR |
4696 | dev_err(DEV, "Got NegDReply; Sector %llus, len %u; Fail original request.\n", |
4697 | (unsigned long long)sector, be32_to_cpu(p->blksize)); | |
4698 | ||
2735a594 AG |
4699 | return validate_req_change_req_state(mdev, p->block_id, sector, |
4700 | &mdev->read_requests, __func__, | |
4701 | NEG_ACKED, false); | |
b411b363 PR |
4702 | } |
4703 | ||
1952e916 | 4704 | static int got_NegRSDReply(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4705 | { |
1952e916 | 4706 | struct drbd_conf *mdev; |
b411b363 PR |
4707 | sector_t sector; |
4708 | int size; | |
e658983a | 4709 | struct p_block_ack *p = pi->data; |
1952e916 AG |
4710 | |
4711 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
4712 | if (!mdev) | |
2735a594 | 4713 | return -EIO; |
b411b363 PR |
4714 | |
4715 | sector = be64_to_cpu(p->sector); | |
4716 | size = be32_to_cpu(p->blksize); | |
b411b363 PR |
4717 | |
4718 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
4719 | ||
4720 | dec_rs_pending(mdev); | |
4721 | ||
4722 | if (get_ldev_if_state(mdev, D_FAILED)) { | |
4723 | drbd_rs_complete_io(mdev, sector); | |
e05e1e59 | 4724 | switch (pi->cmd) { |
d612d309 PR |
4725 | case P_NEG_RS_DREPLY: |
4726 | drbd_rs_failed_io(mdev, sector, size); | |
4727 | case P_RS_CANCEL: | |
4728 | break; | |
4729 | default: | |
2735a594 | 4730 | BUG(); |
d612d309 | 4731 | } |
b411b363 PR |
4732 | put_ldev(mdev); |
4733 | } | |
4734 | ||
2735a594 | 4735 | return 0; |
b411b363 PR |
4736 | } |
4737 | ||
1952e916 | 4738 | static int got_BarrierAck(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4739 | { |
1952e916 | 4740 | struct drbd_conf *mdev; |
e658983a | 4741 | struct p_barrier_ack *p = pi->data; |
1952e916 AG |
4742 | |
4743 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
4744 | if (!mdev) | |
2735a594 | 4745 | return -EIO; |
b411b363 | 4746 | |
2f5cdd0b | 4747 | tl_release(mdev->tconn, p->barrier, be32_to_cpu(p->set_size)); |
b411b363 | 4748 | |
c4752ef1 PR |
4749 | if (mdev->state.conn == C_AHEAD && |
4750 | atomic_read(&mdev->ap_in_flight) == 0 && | |
370a43e7 PR |
4751 | !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &mdev->current_epoch->flags)) { |
4752 | mdev->start_resync_timer.expires = jiffies + HZ; | |
4753 | add_timer(&mdev->start_resync_timer); | |
c4752ef1 PR |
4754 | } |
4755 | ||
2735a594 | 4756 | return 0; |
b411b363 PR |
4757 | } |
4758 | ||
1952e916 | 4759 | static int got_OVResult(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4760 | { |
1952e916 | 4761 | struct drbd_conf *mdev; |
e658983a | 4762 | struct p_block_ack *p = pi->data; |
b411b363 PR |
4763 | struct drbd_work *w; |
4764 | sector_t sector; | |
4765 | int size; | |
4766 | ||
1952e916 AG |
4767 | mdev = vnr_to_mdev(tconn, pi->vnr); |
4768 | if (!mdev) | |
2735a594 | 4769 | return -EIO; |
1952e916 | 4770 | |
b411b363 PR |
4771 | sector = be64_to_cpu(p->sector); |
4772 | size = be32_to_cpu(p->blksize); | |
4773 | ||
4774 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
4775 | ||
4776 | if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) | |
8f7bed77 | 4777 | drbd_ov_out_of_sync_found(mdev, sector, size); |
b411b363 | 4778 | else |
8f7bed77 | 4779 | ov_out_of_sync_print(mdev); |
b411b363 | 4780 | |
1d53f09e | 4781 | if (!get_ldev(mdev)) |
2735a594 | 4782 | return 0; |
1d53f09e | 4783 | |
b411b363 PR |
4784 | drbd_rs_complete_io(mdev, sector); |
4785 | dec_rs_pending(mdev); | |
4786 | ||
ea5442af LE |
4787 | --mdev->ov_left; |
4788 | ||
4789 | /* let's advance progress step marks only for every other megabyte */ | |
4790 | if ((mdev->ov_left & 0x200) == 0x200) | |
4791 | drbd_advance_rs_marks(mdev, mdev->ov_left); | |
4792 | ||
4793 | if (mdev->ov_left == 0) { | |
b411b363 PR |
4794 | w = kmalloc(sizeof(*w), GFP_NOIO); |
4795 | if (w) { | |
4796 | w->cb = w_ov_finished; | |
a21e9298 | 4797 | w->mdev = mdev; |
e42325a5 | 4798 | drbd_queue_work_front(&mdev->tconn->data.work, w); |
b411b363 PR |
4799 | } else { |
4800 | dev_err(DEV, "kmalloc(w) failed."); | |
8f7bed77 | 4801 | ov_out_of_sync_print(mdev); |
b411b363 PR |
4802 | drbd_resync_finished(mdev); |
4803 | } | |
4804 | } | |
1d53f09e | 4805 | put_ldev(mdev); |
2735a594 | 4806 | return 0; |
b411b363 PR |
4807 | } |
4808 | ||
1952e916 | 4809 | static int got_skip(struct drbd_tconn *tconn, struct packet_info *pi) |
0ced55a3 | 4810 | { |
2735a594 | 4811 | return 0; |
0ced55a3 PR |
4812 | } |
4813 | ||
a990be46 | 4814 | static int tconn_finish_peer_reqs(struct drbd_tconn *tconn) |
32862ec7 | 4815 | { |
082a3439 PR |
4816 | struct drbd_conf *mdev; |
4817 | int i, not_empty = 0; | |
32862ec7 PR |
4818 | |
4819 | do { | |
4820 | clear_bit(SIGNAL_ASENDER, &tconn->flags); | |
4821 | flush_signals(current); | |
082a3439 | 4822 | idr_for_each_entry(&tconn->volumes, mdev, i) { |
a990be46 | 4823 | if (drbd_finish_peer_reqs(mdev)) |
082a3439 PR |
4824 | return 1; /* error */ |
4825 | } | |
32862ec7 | 4826 | set_bit(SIGNAL_ASENDER, &tconn->flags); |
082a3439 PR |
4827 | |
4828 | spin_lock_irq(&tconn->req_lock); | |
4829 | idr_for_each_entry(&tconn->volumes, mdev, i) { | |
4830 | not_empty = !list_empty(&mdev->done_ee); | |
4831 | if (not_empty) | |
4832 | break; | |
4833 | } | |
4834 | spin_unlock_irq(&tconn->req_lock); | |
32862ec7 PR |
4835 | } while (not_empty); |
4836 | ||
4837 | return 0; | |
4838 | } | |
4839 | ||
7201b972 AG |
4840 | struct asender_cmd { |
4841 | size_t pkt_size; | |
1952e916 | 4842 | int (*fn)(struct drbd_tconn *tconn, struct packet_info *); |
7201b972 AG |
4843 | }; |
4844 | ||
4845 | static struct asender_cmd asender_tbl[] = { | |
e658983a AG |
4846 | [P_PING] = { 0, got_Ping }, |
4847 | [P_PING_ACK] = { 0, got_PingAck }, | |
1952e916 AG |
4848 | [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, |
4849 | [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, | |
4850 | [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, | |
4851 | [P_DISCARD_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, | |
4852 | [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, | |
4853 | [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, | |
4854 | [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply }, | |
4855 | [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, | |
4856 | [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, | |
4857 | [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, | |
4858 | [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, | |
4859 | [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip }, | |
4860 | [P_RS_CANCEL] = { sizeof(struct p_block_ack), got_NegRSDReply }, | |
4861 | [P_CONN_ST_CHG_REPLY]={ sizeof(struct p_req_state_reply), got_conn_RqSReply }, | |
4862 | [P_RETRY_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, | |
7201b972 AG |
4863 | }; |
4864 | ||
b411b363 PR |
4865 | int drbd_asender(struct drbd_thread *thi) |
4866 | { | |
392c8801 | 4867 | struct drbd_tconn *tconn = thi->tconn; |
b411b363 | 4868 | struct asender_cmd *cmd = NULL; |
77351055 | 4869 | struct packet_info pi; |
257d0af6 | 4870 | int rv; |
e658983a | 4871 | void *buf = tconn->meta.rbuf; |
b411b363 | 4872 | int received = 0; |
52b061a4 AG |
4873 | unsigned int header_size = drbd_header_size(tconn); |
4874 | int expect = header_size; | |
f36af18c | 4875 | int ping_timeout_active = 0; |
b411b363 | 4876 | |
b411b363 PR |
4877 | current->policy = SCHED_RR; /* Make this a realtime task! */ |
4878 | current->rt_priority = 2; /* more important than all other tasks */ | |
4879 | ||
e77a0a5c | 4880 | while (get_t_state(thi) == RUNNING) { |
80822284 | 4881 | drbd_thread_current_set_cpu(thi); |
32862ec7 | 4882 | if (test_and_clear_bit(SEND_PING, &tconn->flags)) { |
a17647aa | 4883 | if (drbd_send_ping(tconn)) { |
32862ec7 | 4884 | conn_err(tconn, "drbd_send_ping has failed\n"); |
841ce241 AG |
4885 | goto reconnect; |
4886 | } | |
32862ec7 PR |
4887 | tconn->meta.socket->sk->sk_rcvtimeo = |
4888 | tconn->net_conf->ping_timeo*HZ/10; | |
f36af18c | 4889 | ping_timeout_active = 1; |
b411b363 PR |
4890 | } |
4891 | ||
32862ec7 PR |
4892 | /* TODO: conditionally cork; it may hurt latency if we cork without |
4893 | much to send */ | |
4894 | if (!tconn->net_conf->no_cork) | |
4895 | drbd_tcp_cork(tconn->meta.socket); | |
a990be46 AG |
4896 | if (tconn_finish_peer_reqs(tconn)) { |
4897 | conn_err(tconn, "tconn_finish_peer_reqs() failed\n"); | |
32862ec7 | 4898 | goto reconnect; |
082a3439 | 4899 | } |
b411b363 | 4900 | /* but unconditionally uncork unless disabled */ |
32862ec7 PR |
4901 | if (!tconn->net_conf->no_cork) |
4902 | drbd_tcp_uncork(tconn->meta.socket); | |
b411b363 PR |
4903 | |
4904 | /* short circuit, recv_msg would return EINTR anyways. */ | |
4905 | if (signal_pending(current)) | |
4906 | continue; | |
4907 | ||
32862ec7 PR |
4908 | rv = drbd_recv_short(tconn->meta.socket, buf, expect-received, 0); |
4909 | clear_bit(SIGNAL_ASENDER, &tconn->flags); | |
b411b363 PR |
4910 | |
4911 | flush_signals(current); | |
4912 | ||
4913 | /* Note: | |
4914 | * -EINTR (on meta) we got a signal | |
4915 | * -EAGAIN (on meta) rcvtimeo expired | |
4916 | * -ECONNRESET other side closed the connection | |
4917 | * -ERESTARTSYS (on data) we got a signal | |
4918 | * rv < 0 other than above: unexpected error! | |
4919 | * rv == expected: full header or command | |
4920 | * rv < expected: "woken" by signal during receive | |
4921 | * rv == 0 : "connection shut down by peer" | |
4922 | */ | |
4923 | if (likely(rv > 0)) { | |
4924 | received += rv; | |
4925 | buf += rv; | |
4926 | } else if (rv == 0) { | |
32862ec7 | 4927 | conn_err(tconn, "meta connection shut down by peer.\n"); |
b411b363 PR |
4928 | goto reconnect; |
4929 | } else if (rv == -EAGAIN) { | |
cb6518cb LE |
4930 | /* If the data socket received something meanwhile, |
4931 | * that is good enough: peer is still alive. */ | |
32862ec7 PR |
4932 | if (time_after(tconn->last_received, |
4933 | jiffies - tconn->meta.socket->sk->sk_rcvtimeo)) | |
cb6518cb | 4934 | continue; |
f36af18c | 4935 | if (ping_timeout_active) { |
32862ec7 | 4936 | conn_err(tconn, "PingAck did not arrive in time.\n"); |
b411b363 PR |
4937 | goto reconnect; |
4938 | } | |
32862ec7 | 4939 | set_bit(SEND_PING, &tconn->flags); |
b411b363 PR |
4940 | continue; |
4941 | } else if (rv == -EINTR) { | |
4942 | continue; | |
4943 | } else { | |
32862ec7 | 4944 | conn_err(tconn, "sock_recvmsg returned %d\n", rv); |
b411b363 PR |
4945 | goto reconnect; |
4946 | } | |
4947 | ||
4948 | if (received == expect && cmd == NULL) { | |
e658983a | 4949 | if (decode_header(tconn, tconn->meta.rbuf, &pi)) |
b411b363 | 4950 | goto reconnect; |
7201b972 | 4951 | cmd = &asender_tbl[pi.cmd]; |
1952e916 | 4952 | if (pi.cmd >= ARRAY_SIZE(asender_tbl) || !cmd->fn) { |
32862ec7 | 4953 | conn_err(tconn, "unknown command %d on meta (l: %d)\n", |
77351055 | 4954 | pi.cmd, pi.size); |
b411b363 PR |
4955 | goto disconnect; |
4956 | } | |
e658983a | 4957 | expect = header_size + cmd->pkt_size; |
52b061a4 | 4958 | if (pi.size != expect - header_size) { |
32862ec7 | 4959 | conn_err(tconn, "Wrong packet size on meta (c: %d, l: %d)\n", |
77351055 | 4960 | pi.cmd, pi.size); |
b411b363 | 4961 | goto reconnect; |
257d0af6 | 4962 | } |
b411b363 PR |
4963 | } |
4964 | if (received == expect) { | |
2735a594 | 4965 | bool err; |
a4fbda8e | 4966 | |
2735a594 AG |
4967 | err = cmd->fn(tconn, &pi); |
4968 | if (err) { | |
1952e916 | 4969 | conn_err(tconn, "%pf failed\n", cmd->fn); |
b411b363 | 4970 | goto reconnect; |
1952e916 | 4971 | } |
b411b363 | 4972 | |
a4fbda8e PR |
4973 | tconn->last_received = jiffies; |
4974 | ||
f36af18c LE |
4975 | /* the idle_timeout (ping-int) |
4976 | * has been restored in got_PingAck() */ | |
7201b972 | 4977 | if (cmd == &asender_tbl[P_PING_ACK]) |
f36af18c LE |
4978 | ping_timeout_active = 0; |
4979 | ||
e658983a | 4980 | buf = tconn->meta.rbuf; |
b411b363 | 4981 | received = 0; |
52b061a4 | 4982 | expect = header_size; |
b411b363 PR |
4983 | cmd = NULL; |
4984 | } | |
4985 | } | |
4986 | ||
4987 | if (0) { | |
4988 | reconnect: | |
bbeb641c | 4989 | conn_request_state(tconn, NS(conn, C_NETWORK_FAILURE), CS_HARD); |
b411b363 PR |
4990 | } |
4991 | if (0) { | |
4992 | disconnect: | |
bbeb641c | 4993 | conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 | 4994 | } |
32862ec7 | 4995 | clear_bit(SIGNAL_ASENDER, &tconn->flags); |
b411b363 | 4996 | |
32862ec7 | 4997 | conn_info(tconn, "asender terminated\n"); |
b411b363 PR |
4998 | |
4999 | return 0; | |
5000 | } |