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); |
c141ebda | 66 | static int drbd_disconnected(struct drbd_conf *mdev); |
b411b363 | 67 | |
1e9dd291 | 68 | static enum finish_epoch drbd_may_finish_epoch(struct drbd_tconn *, 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 | ||
18c2d522 AG |
153 | static struct page *__drbd_alloc_pages(struct drbd_conf *mdev, |
154 | unsigned int number) | |
b411b363 PR |
155 | { |
156 | struct page *page = NULL; | |
45bb912b | 157 | struct page *tmp = NULL; |
18c2d522 | 158 | unsigned int i = 0; |
b411b363 PR |
159 | |
160 | /* Yes, testing drbd_pp_vacant outside the lock is racy. | |
161 | * So what. It saves a spin_lock. */ | |
45bb912b | 162 | if (drbd_pp_vacant >= number) { |
b411b363 | 163 | spin_lock(&drbd_pp_lock); |
45bb912b LE |
164 | page = page_chain_del(&drbd_pp_pool, number); |
165 | if (page) | |
166 | drbd_pp_vacant -= number; | |
b411b363 | 167 | spin_unlock(&drbd_pp_lock); |
45bb912b LE |
168 | if (page) |
169 | return page; | |
b411b363 | 170 | } |
45bb912b | 171 | |
b411b363 PR |
172 | /* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD |
173 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
174 | * which in turn might block on the other node at this very place. */ | |
45bb912b LE |
175 | for (i = 0; i < number; i++) { |
176 | tmp = alloc_page(GFP_TRY); | |
177 | if (!tmp) | |
178 | break; | |
179 | set_page_private(tmp, (unsigned long)page); | |
180 | page = tmp; | |
181 | } | |
182 | ||
183 | if (i == number) | |
184 | return page; | |
185 | ||
186 | /* Not enough pages immediately available this time. | |
c37c8ecf | 187 | * No need to jump around here, drbd_alloc_pages will retry this |
45bb912b LE |
188 | * function "soon". */ |
189 | if (page) { | |
190 | tmp = page_chain_tail(page, NULL); | |
191 | spin_lock(&drbd_pp_lock); | |
192 | page_chain_add(&drbd_pp_pool, page, tmp); | |
193 | drbd_pp_vacant += i; | |
194 | spin_unlock(&drbd_pp_lock); | |
195 | } | |
196 | return NULL; | |
b411b363 PR |
197 | } |
198 | ||
a990be46 AG |
199 | static void reclaim_finished_net_peer_reqs(struct drbd_conf *mdev, |
200 | struct list_head *to_be_freed) | |
b411b363 | 201 | { |
db830c46 | 202 | struct drbd_peer_request *peer_req; |
b411b363 PR |
203 | struct list_head *le, *tle; |
204 | ||
205 | /* The EEs are always appended to the end of the list. Since | |
206 | they are sent in order over the wire, they have to finish | |
207 | in order. As soon as we see the first not finished we can | |
208 | stop to examine the list... */ | |
209 | ||
210 | list_for_each_safe(le, tle, &mdev->net_ee) { | |
db830c46 | 211 | peer_req = list_entry(le, struct drbd_peer_request, w.list); |
045417f7 | 212 | if (drbd_peer_req_has_active_page(peer_req)) |
b411b363 PR |
213 | break; |
214 | list_move(le, to_be_freed); | |
215 | } | |
216 | } | |
217 | ||
218 | static void drbd_kick_lo_and_reclaim_net(struct drbd_conf *mdev) | |
219 | { | |
220 | LIST_HEAD(reclaimed); | |
db830c46 | 221 | struct drbd_peer_request *peer_req, *t; |
b411b363 | 222 | |
87eeee41 | 223 | spin_lock_irq(&mdev->tconn->req_lock); |
a990be46 | 224 | reclaim_finished_net_peer_reqs(mdev, &reclaimed); |
87eeee41 | 225 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 226 | |
db830c46 | 227 | list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) |
3967deb1 | 228 | drbd_free_net_peer_req(mdev, peer_req); |
b411b363 PR |
229 | } |
230 | ||
231 | /** | |
c37c8ecf | 232 | * drbd_alloc_pages() - Returns @number pages, retries forever (or until signalled) |
b411b363 | 233 | * @mdev: DRBD device. |
45bb912b LE |
234 | * @number: number of pages requested |
235 | * @retry: whether to retry, if not enough pages are available right now | |
236 | * | |
237 | * Tries to allocate number pages, first from our own page pool, then from | |
238 | * the kernel, unless this allocation would exceed the max_buffers setting. | |
239 | * Possibly retry until DRBD frees sufficient pages somewhere else. | |
b411b363 | 240 | * |
45bb912b | 241 | * Returns a page chain linked via page->private. |
b411b363 | 242 | */ |
c37c8ecf AG |
243 | struct page *drbd_alloc_pages(struct drbd_conf *mdev, unsigned int number, |
244 | bool retry) | |
b411b363 PR |
245 | { |
246 | struct page *page = NULL; | |
44ed167d | 247 | struct net_conf *nc; |
b411b363 | 248 | DEFINE_WAIT(wait); |
44ed167d | 249 | int mxb; |
b411b363 | 250 | |
45bb912b LE |
251 | /* Yes, we may run up to @number over max_buffers. If we |
252 | * follow it strictly, the admin will get it wrong anyways. */ | |
44ed167d PR |
253 | rcu_read_lock(); |
254 | nc = rcu_dereference(mdev->tconn->net_conf); | |
255 | mxb = nc ? nc->max_buffers : 1000000; | |
256 | rcu_read_unlock(); | |
257 | ||
258 | if (atomic_read(&mdev->pp_in_use) < mxb) | |
18c2d522 | 259 | page = __drbd_alloc_pages(mdev, number); |
b411b363 | 260 | |
45bb912b | 261 | while (page == NULL) { |
b411b363 PR |
262 | prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE); |
263 | ||
264 | drbd_kick_lo_and_reclaim_net(mdev); | |
265 | ||
44ed167d | 266 | if (atomic_read(&mdev->pp_in_use) < mxb) { |
18c2d522 | 267 | page = __drbd_alloc_pages(mdev, number); |
b411b363 PR |
268 | if (page) |
269 | break; | |
270 | } | |
271 | ||
272 | if (!retry) | |
273 | break; | |
274 | ||
275 | if (signal_pending(current)) { | |
c37c8ecf | 276 | dev_warn(DEV, "drbd_alloc_pages interrupted!\n"); |
b411b363 PR |
277 | break; |
278 | } | |
279 | ||
280 | schedule(); | |
281 | } | |
282 | finish_wait(&drbd_pp_wait, &wait); | |
283 | ||
45bb912b LE |
284 | if (page) |
285 | atomic_add(number, &mdev->pp_in_use); | |
b411b363 PR |
286 | return page; |
287 | } | |
288 | ||
c37c8ecf | 289 | /* Must not be used from irq, as that may deadlock: see drbd_alloc_pages. |
87eeee41 | 290 | * Is also used from inside an other spin_lock_irq(&mdev->tconn->req_lock); |
45bb912b LE |
291 | * Either links the page chain back to the global pool, |
292 | * or returns all pages to the system. */ | |
5cc287e0 | 293 | static void drbd_free_pages(struct drbd_conf *mdev, struct page *page, int is_net) |
b411b363 | 294 | { |
435f0740 | 295 | atomic_t *a = is_net ? &mdev->pp_in_use_by_net : &mdev->pp_in_use; |
b411b363 | 296 | int i; |
435f0740 | 297 | |
81a5d60e | 298 | if (drbd_pp_vacant > (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * minor_count) |
45bb912b LE |
299 | i = page_chain_free(page); |
300 | else { | |
301 | struct page *tmp; | |
302 | tmp = page_chain_tail(page, &i); | |
303 | spin_lock(&drbd_pp_lock); | |
304 | page_chain_add(&drbd_pp_pool, page, tmp); | |
305 | drbd_pp_vacant += i; | |
306 | spin_unlock(&drbd_pp_lock); | |
b411b363 | 307 | } |
435f0740 | 308 | i = atomic_sub_return(i, a); |
45bb912b | 309 | if (i < 0) |
435f0740 LE |
310 | dev_warn(DEV, "ASSERTION FAILED: %s: %d < 0\n", |
311 | is_net ? "pp_in_use_by_net" : "pp_in_use", i); | |
b411b363 PR |
312 | wake_up(&drbd_pp_wait); |
313 | } | |
314 | ||
315 | /* | |
316 | You need to hold the req_lock: | |
317 | _drbd_wait_ee_list_empty() | |
318 | ||
319 | You must not have the req_lock: | |
3967deb1 | 320 | drbd_free_peer_req() |
0db55363 | 321 | drbd_alloc_peer_req() |
7721f567 | 322 | drbd_free_peer_reqs() |
b411b363 | 323 | drbd_ee_fix_bhs() |
a990be46 | 324 | drbd_finish_peer_reqs() |
b411b363 PR |
325 | drbd_clear_done_ee() |
326 | drbd_wait_ee_list_empty() | |
327 | */ | |
328 | ||
f6ffca9f | 329 | struct drbd_peer_request * |
0db55363 AG |
330 | drbd_alloc_peer_req(struct drbd_conf *mdev, u64 id, sector_t sector, |
331 | unsigned int data_size, gfp_t gfp_mask) __must_hold(local) | |
b411b363 | 332 | { |
db830c46 | 333 | struct drbd_peer_request *peer_req; |
b411b363 | 334 | struct page *page; |
45bb912b | 335 | unsigned nr_pages = (data_size + PAGE_SIZE -1) >> PAGE_SHIFT; |
b411b363 | 336 | |
0cf9d27e | 337 | if (drbd_insert_fault(mdev, DRBD_FAULT_AL_EE)) |
b411b363 PR |
338 | return NULL; |
339 | ||
db830c46 AG |
340 | peer_req = mempool_alloc(drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM); |
341 | if (!peer_req) { | |
b411b363 | 342 | if (!(gfp_mask & __GFP_NOWARN)) |
0db55363 | 343 | dev_err(DEV, "%s: allocation failed\n", __func__); |
b411b363 PR |
344 | return NULL; |
345 | } | |
346 | ||
c37c8ecf | 347 | page = drbd_alloc_pages(mdev, nr_pages, (gfp_mask & __GFP_WAIT)); |
45bb912b LE |
348 | if (!page) |
349 | goto fail; | |
b411b363 | 350 | |
db830c46 AG |
351 | drbd_clear_interval(&peer_req->i); |
352 | peer_req->i.size = data_size; | |
353 | peer_req->i.sector = sector; | |
354 | peer_req->i.local = false; | |
355 | peer_req->i.waiting = false; | |
356 | ||
357 | peer_req->epoch = NULL; | |
a21e9298 | 358 | peer_req->w.mdev = mdev; |
db830c46 AG |
359 | peer_req->pages = page; |
360 | atomic_set(&peer_req->pending_bios, 0); | |
361 | peer_req->flags = 0; | |
9a8e7753 AG |
362 | /* |
363 | * The block_id is opaque to the receiver. It is not endianness | |
364 | * converted, and sent back to the sender unchanged. | |
365 | */ | |
db830c46 | 366 | peer_req->block_id = id; |
b411b363 | 367 | |
db830c46 | 368 | return peer_req; |
b411b363 | 369 | |
45bb912b | 370 | fail: |
db830c46 | 371 | mempool_free(peer_req, drbd_ee_mempool); |
b411b363 PR |
372 | return NULL; |
373 | } | |
374 | ||
3967deb1 | 375 | void __drbd_free_peer_req(struct drbd_conf *mdev, struct drbd_peer_request *peer_req, |
f6ffca9f | 376 | int is_net) |
b411b363 | 377 | { |
db830c46 AG |
378 | if (peer_req->flags & EE_HAS_DIGEST) |
379 | kfree(peer_req->digest); | |
5cc287e0 | 380 | drbd_free_pages(mdev, peer_req->pages, is_net); |
db830c46 AG |
381 | D_ASSERT(atomic_read(&peer_req->pending_bios) == 0); |
382 | D_ASSERT(drbd_interval_empty(&peer_req->i)); | |
383 | mempool_free(peer_req, drbd_ee_mempool); | |
b411b363 PR |
384 | } |
385 | ||
7721f567 | 386 | int drbd_free_peer_reqs(struct drbd_conf *mdev, struct list_head *list) |
b411b363 PR |
387 | { |
388 | LIST_HEAD(work_list); | |
db830c46 | 389 | struct drbd_peer_request *peer_req, *t; |
b411b363 | 390 | int count = 0; |
435f0740 | 391 | int is_net = list == &mdev->net_ee; |
b411b363 | 392 | |
87eeee41 | 393 | spin_lock_irq(&mdev->tconn->req_lock); |
b411b363 | 394 | list_splice_init(list, &work_list); |
87eeee41 | 395 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 396 | |
db830c46 | 397 | list_for_each_entry_safe(peer_req, t, &work_list, w.list) { |
3967deb1 | 398 | __drbd_free_peer_req(mdev, peer_req, is_net); |
b411b363 PR |
399 | count++; |
400 | } | |
401 | return count; | |
402 | } | |
403 | ||
a990be46 AG |
404 | /* |
405 | * See also comments in _req_mod(,BARRIER_ACKED) and receive_Barrier. | |
b411b363 | 406 | */ |
a990be46 | 407 | static int drbd_finish_peer_reqs(struct drbd_conf *mdev) |
b411b363 PR |
408 | { |
409 | LIST_HEAD(work_list); | |
410 | LIST_HEAD(reclaimed); | |
db830c46 | 411 | struct drbd_peer_request *peer_req, *t; |
e2b3032b | 412 | int err = 0; |
b411b363 | 413 | |
87eeee41 | 414 | spin_lock_irq(&mdev->tconn->req_lock); |
a990be46 | 415 | reclaim_finished_net_peer_reqs(mdev, &reclaimed); |
b411b363 | 416 | list_splice_init(&mdev->done_ee, &work_list); |
87eeee41 | 417 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 418 | |
db830c46 | 419 | list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) |
3967deb1 | 420 | drbd_free_net_peer_req(mdev, peer_req); |
b411b363 PR |
421 | |
422 | /* possible callbacks here: | |
7be8da07 | 423 | * e_end_block, and e_end_resync_block, e_send_discard_write. |
b411b363 PR |
424 | * all ignore the last argument. |
425 | */ | |
db830c46 | 426 | list_for_each_entry_safe(peer_req, t, &work_list, w.list) { |
e2b3032b AG |
427 | int err2; |
428 | ||
b411b363 | 429 | /* list_del not necessary, next/prev members not touched */ |
e2b3032b AG |
430 | err2 = peer_req->w.cb(&peer_req->w, !!err); |
431 | if (!err) | |
432 | err = err2; | |
3967deb1 | 433 | drbd_free_peer_req(mdev, peer_req); |
b411b363 PR |
434 | } |
435 | wake_up(&mdev->ee_wait); | |
436 | ||
e2b3032b | 437 | return err; |
b411b363 PR |
438 | } |
439 | ||
d4da1537 AG |
440 | static void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, |
441 | struct list_head *head) | |
b411b363 PR |
442 | { |
443 | DEFINE_WAIT(wait); | |
444 | ||
445 | /* avoids spin_lock/unlock | |
446 | * and calling prepare_to_wait in the fast path */ | |
447 | while (!list_empty(head)) { | |
448 | prepare_to_wait(&mdev->ee_wait, &wait, TASK_UNINTERRUPTIBLE); | |
87eeee41 | 449 | spin_unlock_irq(&mdev->tconn->req_lock); |
7eaceacc | 450 | io_schedule(); |
b411b363 | 451 | finish_wait(&mdev->ee_wait, &wait); |
87eeee41 | 452 | spin_lock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
453 | } |
454 | } | |
455 | ||
d4da1537 AG |
456 | static void drbd_wait_ee_list_empty(struct drbd_conf *mdev, |
457 | struct list_head *head) | |
b411b363 | 458 | { |
87eeee41 | 459 | spin_lock_irq(&mdev->tconn->req_lock); |
b411b363 | 460 | _drbd_wait_ee_list_empty(mdev, head); |
87eeee41 | 461 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
462 | } |
463 | ||
464 | /* see also kernel_accept; which is only present since 2.6.18. | |
465 | * also we want to log which part of it failed, exactly */ | |
7653620d | 466 | static int drbd_accept(const char **what, struct socket *sock, struct socket **newsock) |
b411b363 PR |
467 | { |
468 | struct sock *sk = sock->sk; | |
469 | int err = 0; | |
470 | ||
471 | *what = "listen"; | |
472 | err = sock->ops->listen(sock, 5); | |
473 | if (err < 0) | |
474 | goto out; | |
475 | ||
476 | *what = "sock_create_lite"; | |
477 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, | |
478 | newsock); | |
479 | if (err < 0) | |
480 | goto out; | |
481 | ||
482 | *what = "accept"; | |
483 | err = sock->ops->accept(sock, *newsock, 0); | |
484 | if (err < 0) { | |
485 | sock_release(*newsock); | |
486 | *newsock = NULL; | |
487 | goto out; | |
488 | } | |
489 | (*newsock)->ops = sock->ops; | |
dd9b3604 | 490 | __module_get((*newsock)->ops->owner); |
b411b363 PR |
491 | |
492 | out: | |
493 | return err; | |
494 | } | |
495 | ||
dbd9eea0 | 496 | static int drbd_recv_short(struct socket *sock, void *buf, size_t size, int flags) |
b411b363 PR |
497 | { |
498 | mm_segment_t oldfs; | |
499 | struct kvec iov = { | |
500 | .iov_base = buf, | |
501 | .iov_len = size, | |
502 | }; | |
503 | struct msghdr msg = { | |
504 | .msg_iovlen = 1, | |
505 | .msg_iov = (struct iovec *)&iov, | |
506 | .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) | |
507 | }; | |
508 | int rv; | |
509 | ||
510 | oldfs = get_fs(); | |
511 | set_fs(KERNEL_DS); | |
512 | rv = sock_recvmsg(sock, &msg, size, msg.msg_flags); | |
513 | set_fs(oldfs); | |
514 | ||
515 | return rv; | |
516 | } | |
517 | ||
de0ff338 | 518 | static int drbd_recv(struct drbd_tconn *tconn, void *buf, size_t size) |
b411b363 PR |
519 | { |
520 | mm_segment_t oldfs; | |
521 | struct kvec iov = { | |
522 | .iov_base = buf, | |
523 | .iov_len = size, | |
524 | }; | |
525 | struct msghdr msg = { | |
526 | .msg_iovlen = 1, | |
527 | .msg_iov = (struct iovec *)&iov, | |
528 | .msg_flags = MSG_WAITALL | MSG_NOSIGNAL | |
529 | }; | |
530 | int rv; | |
531 | ||
532 | oldfs = get_fs(); | |
533 | set_fs(KERNEL_DS); | |
534 | ||
535 | for (;;) { | |
de0ff338 | 536 | rv = sock_recvmsg(tconn->data.socket, &msg, size, msg.msg_flags); |
b411b363 PR |
537 | if (rv == size) |
538 | break; | |
539 | ||
540 | /* Note: | |
541 | * ECONNRESET other side closed the connection | |
542 | * ERESTARTSYS (on sock) we got a signal | |
543 | */ | |
544 | ||
545 | if (rv < 0) { | |
546 | if (rv == -ECONNRESET) | |
de0ff338 | 547 | conn_info(tconn, "sock was reset by peer\n"); |
b411b363 | 548 | else if (rv != -ERESTARTSYS) |
de0ff338 | 549 | conn_err(tconn, "sock_recvmsg returned %d\n", rv); |
b411b363 PR |
550 | break; |
551 | } else if (rv == 0) { | |
de0ff338 | 552 | conn_info(tconn, "sock was shut down by peer\n"); |
b411b363 PR |
553 | break; |
554 | } else { | |
555 | /* signal came in, or peer/link went down, | |
556 | * after we read a partial message | |
557 | */ | |
558 | /* D_ASSERT(signal_pending(current)); */ | |
559 | break; | |
560 | } | |
561 | }; | |
562 | ||
563 | set_fs(oldfs); | |
564 | ||
565 | if (rv != size) | |
bbeb641c | 566 | conn_request_state(tconn, NS(conn, C_BROKEN_PIPE), CS_HARD); |
b411b363 PR |
567 | |
568 | return rv; | |
569 | } | |
570 | ||
c6967746 AG |
571 | static int drbd_recv_all(struct drbd_tconn *tconn, void *buf, size_t size) |
572 | { | |
573 | int err; | |
574 | ||
575 | err = drbd_recv(tconn, buf, size); | |
576 | if (err != size) { | |
577 | if (err >= 0) | |
578 | err = -EIO; | |
579 | } else | |
580 | err = 0; | |
581 | return err; | |
582 | } | |
583 | ||
a5c31904 AG |
584 | static int drbd_recv_all_warn(struct drbd_tconn *tconn, void *buf, size_t size) |
585 | { | |
586 | int err; | |
587 | ||
588 | err = drbd_recv_all(tconn, buf, size); | |
589 | if (err && !signal_pending(current)) | |
590 | conn_warn(tconn, "short read (expected size %d)\n", (int)size); | |
591 | return err; | |
592 | } | |
593 | ||
5dbf1673 LE |
594 | /* quoting tcp(7): |
595 | * On individual connections, the socket buffer size must be set prior to the | |
596 | * listen(2) or connect(2) calls in order to have it take effect. | |
597 | * This is our wrapper to do so. | |
598 | */ | |
599 | static void drbd_setbufsize(struct socket *sock, unsigned int snd, | |
600 | unsigned int rcv) | |
601 | { | |
602 | /* open coded SO_SNDBUF, SO_RCVBUF */ | |
603 | if (snd) { | |
604 | sock->sk->sk_sndbuf = snd; | |
605 | sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; | |
606 | } | |
607 | if (rcv) { | |
608 | sock->sk->sk_rcvbuf = rcv; | |
609 | sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; | |
610 | } | |
611 | } | |
612 | ||
eac3e990 | 613 | static struct socket *drbd_try_connect(struct drbd_tconn *tconn) |
b411b363 PR |
614 | { |
615 | const char *what; | |
616 | struct socket *sock; | |
617 | struct sockaddr_in6 src_in6; | |
44ed167d PR |
618 | struct sockaddr_in6 peer_in6; |
619 | struct net_conf *nc; | |
620 | int err, peer_addr_len, my_addr_len; | |
69ef82de | 621 | int sndbuf_size, rcvbuf_size, connect_int; |
b411b363 PR |
622 | int disconnect_on_error = 1; |
623 | ||
44ed167d PR |
624 | rcu_read_lock(); |
625 | nc = rcu_dereference(tconn->net_conf); | |
626 | if (!nc) { | |
627 | rcu_read_unlock(); | |
b411b363 | 628 | return NULL; |
44ed167d | 629 | } |
44ed167d PR |
630 | sndbuf_size = nc->sndbuf_size; |
631 | rcvbuf_size = nc->rcvbuf_size; | |
69ef82de | 632 | connect_int = nc->connect_int; |
089c075d | 633 | rcu_read_unlock(); |
44ed167d | 634 | |
089c075d AG |
635 | my_addr_len = min_t(int, tconn->my_addr_len, sizeof(src_in6)); |
636 | memcpy(&src_in6, &tconn->my_addr, my_addr_len); | |
44ed167d | 637 | |
089c075d | 638 | if (((struct sockaddr *)&tconn->my_addr)->sa_family == AF_INET6) |
44ed167d PR |
639 | src_in6.sin6_port = 0; |
640 | else | |
641 | ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ | |
642 | ||
089c075d AG |
643 | peer_addr_len = min_t(int, tconn->peer_addr_len, sizeof(src_in6)); |
644 | memcpy(&peer_in6, &tconn->peer_addr, peer_addr_len); | |
b411b363 PR |
645 | |
646 | what = "sock_create_kern"; | |
44ed167d PR |
647 | err = sock_create_kern(((struct sockaddr *)&src_in6)->sa_family, |
648 | SOCK_STREAM, IPPROTO_TCP, &sock); | |
b411b363 PR |
649 | if (err < 0) { |
650 | sock = NULL; | |
651 | goto out; | |
652 | } | |
653 | ||
654 | sock->sk->sk_rcvtimeo = | |
69ef82de | 655 | sock->sk->sk_sndtimeo = connect_int * HZ; |
44ed167d | 656 | drbd_setbufsize(sock, sndbuf_size, rcvbuf_size); |
b411b363 PR |
657 | |
658 | /* explicitly bind to the configured IP as source IP | |
659 | * for the outgoing connections. | |
660 | * This is needed for multihomed hosts and to be | |
661 | * able to use lo: interfaces for drbd. | |
662 | * Make sure to use 0 as port number, so linux selects | |
663 | * a free one dynamically. | |
664 | */ | |
b411b363 | 665 | what = "bind before connect"; |
44ed167d | 666 | err = sock->ops->bind(sock, (struct sockaddr *) &src_in6, my_addr_len); |
b411b363 PR |
667 | if (err < 0) |
668 | goto out; | |
669 | ||
670 | /* connect may fail, peer not yet available. | |
671 | * stay C_WF_CONNECTION, don't go Disconnecting! */ | |
672 | disconnect_on_error = 0; | |
673 | what = "connect"; | |
44ed167d | 674 | err = sock->ops->connect(sock, (struct sockaddr *) &peer_in6, peer_addr_len, 0); |
b411b363 PR |
675 | |
676 | out: | |
677 | if (err < 0) { | |
678 | if (sock) { | |
679 | sock_release(sock); | |
680 | sock = NULL; | |
681 | } | |
682 | switch (-err) { | |
683 | /* timeout, busy, signal pending */ | |
684 | case ETIMEDOUT: case EAGAIN: case EINPROGRESS: | |
685 | case EINTR: case ERESTARTSYS: | |
686 | /* peer not (yet) available, network problem */ | |
687 | case ECONNREFUSED: case ENETUNREACH: | |
688 | case EHOSTDOWN: case EHOSTUNREACH: | |
689 | disconnect_on_error = 0; | |
690 | break; | |
691 | default: | |
eac3e990 | 692 | conn_err(tconn, "%s failed, err = %d\n", what, err); |
b411b363 PR |
693 | } |
694 | if (disconnect_on_error) | |
bbeb641c | 695 | conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 | 696 | } |
44ed167d | 697 | |
b411b363 PR |
698 | return sock; |
699 | } | |
700 | ||
7653620d | 701 | static struct socket *drbd_wait_for_connect(struct drbd_tconn *tconn) |
b411b363 | 702 | { |
44ed167d | 703 | int timeo, err, my_addr_len; |
69ef82de | 704 | int sndbuf_size, rcvbuf_size, connect_int; |
b411b363 | 705 | struct socket *s_estab = NULL, *s_listen; |
44ed167d PR |
706 | struct sockaddr_in6 my_addr; |
707 | struct net_conf *nc; | |
b411b363 PR |
708 | const char *what; |
709 | ||
44ed167d PR |
710 | rcu_read_lock(); |
711 | nc = rcu_dereference(tconn->net_conf); | |
712 | if (!nc) { | |
713 | rcu_read_unlock(); | |
b411b363 | 714 | return NULL; |
44ed167d | 715 | } |
44ed167d PR |
716 | sndbuf_size = nc->sndbuf_size; |
717 | rcvbuf_size = nc->rcvbuf_size; | |
69ef82de | 718 | connect_int = nc->connect_int; |
44ed167d | 719 | rcu_read_unlock(); |
b411b363 | 720 | |
089c075d AG |
721 | my_addr_len = min_t(int, tconn->my_addr_len, sizeof(struct sockaddr_in6)); |
722 | memcpy(&my_addr, &tconn->my_addr, my_addr_len); | |
723 | ||
b411b363 | 724 | what = "sock_create_kern"; |
44ed167d | 725 | err = sock_create_kern(((struct sockaddr *)&my_addr)->sa_family, |
b411b363 PR |
726 | SOCK_STREAM, IPPROTO_TCP, &s_listen); |
727 | if (err) { | |
728 | s_listen = NULL; | |
729 | goto out; | |
730 | } | |
731 | ||
69ef82de | 732 | timeo = connect_int * HZ; |
b411b363 PR |
733 | timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */ |
734 | ||
735 | s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */ | |
736 | s_listen->sk->sk_rcvtimeo = timeo; | |
737 | s_listen->sk->sk_sndtimeo = timeo; | |
44ed167d | 738 | drbd_setbufsize(s_listen, sndbuf_size, rcvbuf_size); |
b411b363 PR |
739 | |
740 | what = "bind before listen"; | |
44ed167d | 741 | err = s_listen->ops->bind(s_listen, (struct sockaddr *)&my_addr, my_addr_len); |
b411b363 PR |
742 | if (err < 0) |
743 | goto out; | |
744 | ||
7653620d | 745 | err = drbd_accept(&what, s_listen, &s_estab); |
b411b363 PR |
746 | |
747 | out: | |
748 | if (s_listen) | |
749 | sock_release(s_listen); | |
750 | if (err < 0) { | |
751 | if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { | |
7653620d | 752 | conn_err(tconn, "%s failed, err = %d\n", what, err); |
bbeb641c | 753 | conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 PR |
754 | } |
755 | } | |
b411b363 PR |
756 | |
757 | return s_estab; | |
758 | } | |
759 | ||
e658983a | 760 | static int decode_header(struct drbd_tconn *, void *, struct packet_info *); |
b411b363 | 761 | |
9f5bdc33 AG |
762 | static int send_first_packet(struct drbd_tconn *tconn, struct drbd_socket *sock, |
763 | enum drbd_packet cmd) | |
764 | { | |
765 | if (!conn_prepare_command(tconn, sock)) | |
766 | return -EIO; | |
e658983a | 767 | return conn_send_command(tconn, sock, cmd, 0, NULL, 0); |
b411b363 PR |
768 | } |
769 | ||
9f5bdc33 | 770 | static int receive_first_packet(struct drbd_tconn *tconn, struct socket *sock) |
b411b363 | 771 | { |
9f5bdc33 AG |
772 | unsigned int header_size = drbd_header_size(tconn); |
773 | struct packet_info pi; | |
774 | int err; | |
b411b363 | 775 | |
9f5bdc33 AG |
776 | err = drbd_recv_short(sock, tconn->data.rbuf, header_size, 0); |
777 | if (err != header_size) { | |
778 | if (err >= 0) | |
779 | err = -EIO; | |
780 | return err; | |
781 | } | |
782 | err = decode_header(tconn, tconn->data.rbuf, &pi); | |
783 | if (err) | |
784 | return err; | |
785 | return pi.cmd; | |
b411b363 PR |
786 | } |
787 | ||
788 | /** | |
789 | * drbd_socket_okay() - Free the socket if its connection is not okay | |
b411b363 PR |
790 | * @sock: pointer to the pointer to the socket. |
791 | */ | |
dbd9eea0 | 792 | static int drbd_socket_okay(struct socket **sock) |
b411b363 PR |
793 | { |
794 | int rr; | |
795 | char tb[4]; | |
796 | ||
797 | if (!*sock) | |
81e84650 | 798 | return false; |
b411b363 | 799 | |
dbd9eea0 | 800 | rr = drbd_recv_short(*sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); |
b411b363 PR |
801 | |
802 | if (rr > 0 || rr == -EAGAIN) { | |
81e84650 | 803 | return true; |
b411b363 PR |
804 | } else { |
805 | sock_release(*sock); | |
806 | *sock = NULL; | |
81e84650 | 807 | return false; |
b411b363 PR |
808 | } |
809 | } | |
2325eb66 PR |
810 | /* Gets called if a connection is established, or if a new minor gets created |
811 | in a connection */ | |
c141ebda | 812 | int drbd_connected(struct drbd_conf *mdev) |
907599e0 | 813 | { |
0829f5ed | 814 | int err; |
907599e0 PR |
815 | |
816 | atomic_set(&mdev->packet_seq, 0); | |
817 | mdev->peer_seq = 0; | |
818 | ||
8410da8f PR |
819 | mdev->state_mutex = mdev->tconn->agreed_pro_version < 100 ? |
820 | &mdev->tconn->cstate_mutex : | |
821 | &mdev->own_state_mutex; | |
822 | ||
0829f5ed AG |
823 | err = drbd_send_sync_param(mdev); |
824 | if (!err) | |
825 | err = drbd_send_sizes(mdev, 0, 0); | |
826 | if (!err) | |
827 | err = drbd_send_uuids(mdev); | |
828 | if (!err) | |
43de7c85 | 829 | err = drbd_send_current_state(mdev); |
907599e0 PR |
830 | clear_bit(USE_DEGR_WFC_T, &mdev->flags); |
831 | clear_bit(RESIZE_PENDING, &mdev->flags); | |
8b924f1d | 832 | mod_timer(&mdev->request_timer, jiffies + HZ); /* just start it here. */ |
0829f5ed | 833 | return err; |
907599e0 PR |
834 | } |
835 | ||
b411b363 PR |
836 | /* |
837 | * return values: | |
838 | * 1 yes, we have a valid connection | |
839 | * 0 oops, did not work out, please try again | |
840 | * -1 peer talks different language, | |
841 | * no point in trying again, please go standalone. | |
842 | * -2 We do not have a network config... | |
843 | */ | |
81fa2e67 | 844 | static int conn_connect(struct drbd_tconn *tconn) |
b411b363 | 845 | { |
7da35862 | 846 | struct drbd_socket sock, msock; |
c141ebda | 847 | struct drbd_conf *mdev; |
44ed167d | 848 | struct net_conf *nc; |
c141ebda | 849 | int vnr, timeout, try, h, ok; |
08b165ba | 850 | bool discard_my_data; |
b411b363 | 851 | |
bbeb641c | 852 | if (conn_request_state(tconn, NS(conn, C_WF_CONNECTION), CS_VERBOSE) < SS_SUCCESS) |
b411b363 PR |
853 | return -2; |
854 | ||
7da35862 PR |
855 | mutex_init(&sock.mutex); |
856 | sock.sbuf = tconn->data.sbuf; | |
857 | sock.rbuf = tconn->data.rbuf; | |
858 | sock.socket = NULL; | |
859 | mutex_init(&msock.mutex); | |
860 | msock.sbuf = tconn->meta.sbuf; | |
861 | msock.rbuf = tconn->meta.rbuf; | |
862 | msock.socket = NULL; | |
863 | ||
907599e0 | 864 | clear_bit(DISCARD_CONCURRENT, &tconn->flags); |
0916e0e3 AG |
865 | |
866 | /* Assume that the peer only understands protocol 80 until we know better. */ | |
867 | tconn->agreed_pro_version = 80; | |
b411b363 | 868 | |
b411b363 | 869 | do { |
2bf89621 AG |
870 | struct socket *s; |
871 | ||
b411b363 PR |
872 | for (try = 0;;) { |
873 | /* 3 tries, this should take less than a second! */ | |
907599e0 | 874 | s = drbd_try_connect(tconn); |
b411b363 PR |
875 | if (s || ++try >= 3) |
876 | break; | |
877 | /* give the other side time to call bind() & listen() */ | |
20ee6390 | 878 | schedule_timeout_interruptible(HZ / 10); |
b411b363 PR |
879 | } |
880 | ||
881 | if (s) { | |
7da35862 PR |
882 | if (!sock.socket) { |
883 | sock.socket = s; | |
884 | send_first_packet(tconn, &sock, P_INITIAL_DATA); | |
885 | } else if (!msock.socket) { | |
886 | msock.socket = s; | |
887 | send_first_packet(tconn, &msock, P_INITIAL_META); | |
b411b363 | 888 | } else { |
81fa2e67 | 889 | conn_err(tconn, "Logic error in conn_connect()\n"); |
b411b363 PR |
890 | goto out_release_sockets; |
891 | } | |
892 | } | |
893 | ||
7da35862 PR |
894 | if (sock.socket && msock.socket) { |
895 | rcu_read_lock(); | |
896 | nc = rcu_dereference(tconn->net_conf); | |
897 | timeout = nc->ping_timeo * HZ / 10; | |
898 | rcu_read_unlock(); | |
899 | schedule_timeout_interruptible(timeout); | |
900 | ok = drbd_socket_okay(&sock.socket); | |
901 | ok = drbd_socket_okay(&msock.socket) && ok; | |
b411b363 PR |
902 | if (ok) |
903 | break; | |
904 | } | |
905 | ||
906 | retry: | |
907599e0 | 907 | s = drbd_wait_for_connect(tconn); |
b411b363 | 908 | if (s) { |
9f5bdc33 | 909 | try = receive_first_packet(tconn, s); |
7da35862 PR |
910 | drbd_socket_okay(&sock.socket); |
911 | drbd_socket_okay(&msock.socket); | |
b411b363 | 912 | switch (try) { |
e5d6f33a | 913 | case P_INITIAL_DATA: |
7da35862 | 914 | if (sock.socket) { |
907599e0 | 915 | conn_warn(tconn, "initial packet S crossed\n"); |
7da35862 | 916 | sock_release(sock.socket); |
b411b363 | 917 | } |
7da35862 | 918 | sock.socket = s; |
b411b363 | 919 | break; |
e5d6f33a | 920 | case P_INITIAL_META: |
7da35862 | 921 | if (msock.socket) { |
907599e0 | 922 | conn_warn(tconn, "initial packet M crossed\n"); |
7da35862 | 923 | sock_release(msock.socket); |
b411b363 | 924 | } |
7da35862 | 925 | msock.socket = s; |
907599e0 | 926 | set_bit(DISCARD_CONCURRENT, &tconn->flags); |
b411b363 PR |
927 | break; |
928 | default: | |
907599e0 | 929 | conn_warn(tconn, "Error receiving initial packet\n"); |
b411b363 PR |
930 | sock_release(s); |
931 | if (random32() & 1) | |
932 | goto retry; | |
933 | } | |
934 | } | |
935 | ||
bbeb641c | 936 | if (tconn->cstate <= C_DISCONNECTING) |
b411b363 PR |
937 | goto out_release_sockets; |
938 | if (signal_pending(current)) { | |
939 | flush_signals(current); | |
940 | smp_rmb(); | |
907599e0 | 941 | if (get_t_state(&tconn->receiver) == EXITING) |
b411b363 PR |
942 | goto out_release_sockets; |
943 | } | |
944 | ||
7da35862 PR |
945 | if (sock.socket && &msock.socket) { |
946 | ok = drbd_socket_okay(&sock.socket); | |
947 | ok = drbd_socket_okay(&msock.socket) && ok; | |
b411b363 PR |
948 | if (ok) |
949 | break; | |
950 | } | |
951 | } while (1); | |
952 | ||
7da35862 PR |
953 | sock.socket->sk->sk_reuse = 1; /* SO_REUSEADDR */ |
954 | msock.socket->sk->sk_reuse = 1; /* SO_REUSEADDR */ | |
b411b363 | 955 | |
7da35862 PR |
956 | sock.socket->sk->sk_allocation = GFP_NOIO; |
957 | msock.socket->sk->sk_allocation = GFP_NOIO; | |
b411b363 | 958 | |
7da35862 PR |
959 | sock.socket->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; |
960 | msock.socket->sk->sk_priority = TC_PRIO_INTERACTIVE; | |
b411b363 | 961 | |
b411b363 | 962 | /* NOT YET ... |
7da35862 PR |
963 | * sock.socket->sk->sk_sndtimeo = tconn->net_conf->timeout*HZ/10; |
964 | * sock.socket->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
6038178e | 965 | * first set it to the P_CONNECTION_FEATURES timeout, |
b411b363 | 966 | * which we set to 4x the configured ping_timeout. */ |
44ed167d PR |
967 | rcu_read_lock(); |
968 | nc = rcu_dereference(tconn->net_conf); | |
969 | ||
7da35862 PR |
970 | sock.socket->sk->sk_sndtimeo = |
971 | sock.socket->sk->sk_rcvtimeo = nc->ping_timeo*4*HZ/10; | |
44ed167d | 972 | |
7da35862 | 973 | msock.socket->sk->sk_rcvtimeo = nc->ping_int*HZ; |
44ed167d | 974 | timeout = nc->timeout * HZ / 10; |
08b165ba | 975 | discard_my_data = nc->discard_my_data; |
44ed167d | 976 | rcu_read_unlock(); |
b411b363 | 977 | |
7da35862 | 978 | msock.socket->sk->sk_sndtimeo = timeout; |
b411b363 PR |
979 | |
980 | /* we don't want delays. | |
25985edc | 981 | * we use TCP_CORK where appropriate, though */ |
7da35862 PR |
982 | drbd_tcp_nodelay(sock.socket); |
983 | drbd_tcp_nodelay(msock.socket); | |
b411b363 | 984 | |
7da35862 PR |
985 | tconn->data.socket = sock.socket; |
986 | tconn->meta.socket = msock.socket; | |
907599e0 | 987 | tconn->last_received = jiffies; |
b411b363 | 988 | |
6038178e | 989 | h = drbd_do_features(tconn); |
b411b363 PR |
990 | if (h <= 0) |
991 | return h; | |
992 | ||
907599e0 | 993 | if (tconn->cram_hmac_tfm) { |
b411b363 | 994 | /* drbd_request_state(mdev, NS(conn, WFAuth)); */ |
907599e0 | 995 | switch (drbd_do_auth(tconn)) { |
b10d96cb | 996 | case -1: |
907599e0 | 997 | conn_err(tconn, "Authentication of peer failed\n"); |
b411b363 | 998 | return -1; |
b10d96cb | 999 | case 0: |
907599e0 | 1000 | conn_err(tconn, "Authentication of peer failed, trying again.\n"); |
b10d96cb | 1001 | return 0; |
b411b363 PR |
1002 | } |
1003 | } | |
1004 | ||
7da35862 PR |
1005 | tconn->data.socket->sk->sk_sndtimeo = timeout; |
1006 | tconn->data.socket->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
b411b363 | 1007 | |
387eb308 | 1008 | if (drbd_send_protocol(tconn) == -EOPNOTSUPP) |
7e2455c1 | 1009 | return -1; |
b411b363 | 1010 | |
c141ebda PR |
1011 | rcu_read_lock(); |
1012 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { | |
1013 | kref_get(&mdev->kref); | |
1014 | rcu_read_unlock(); | |
08b165ba PR |
1015 | |
1016 | if (discard_my_data) | |
1017 | set_bit(DISCARD_MY_DATA, &mdev->flags); | |
1018 | else | |
1019 | clear_bit(DISCARD_MY_DATA, &mdev->flags); | |
1020 | ||
c141ebda PR |
1021 | drbd_connected(mdev); |
1022 | kref_put(&mdev->kref, &drbd_minor_destroy); | |
1023 | rcu_read_lock(); | |
1024 | } | |
1025 | rcu_read_unlock(); | |
1026 | ||
823bd832 PR |
1027 | if (conn_request_state(tconn, NS(conn, C_WF_REPORT_PARAMS), CS_VERBOSE) < SS_SUCCESS) |
1028 | return 0; | |
1029 | ||
1030 | drbd_thread_start(&tconn->asender); | |
1031 | ||
08b165ba PR |
1032 | mutex_lock(&tconn->conf_update); |
1033 | /* The discard_my_data flag is a single-shot modifier to the next | |
1034 | * connection attempt, the handshake of which is now well underway. | |
1035 | * No need for rcu style copying of the whole struct | |
1036 | * just to clear a single value. */ | |
1037 | tconn->net_conf->discard_my_data = 0; | |
1038 | mutex_unlock(&tconn->conf_update); | |
1039 | ||
d3fcb490 | 1040 | return h; |
b411b363 PR |
1041 | |
1042 | out_release_sockets: | |
7da35862 PR |
1043 | if (sock.socket) |
1044 | sock_release(sock.socket); | |
1045 | if (msock.socket) | |
1046 | sock_release(msock.socket); | |
b411b363 PR |
1047 | return -1; |
1048 | } | |
1049 | ||
e658983a | 1050 | static int decode_header(struct drbd_tconn *tconn, void *header, struct packet_info *pi) |
b411b363 | 1051 | { |
e658983a AG |
1052 | unsigned int header_size = drbd_header_size(tconn); |
1053 | ||
0c8e36d9 AG |
1054 | if (header_size == sizeof(struct p_header100) && |
1055 | *(__be32 *)header == cpu_to_be32(DRBD_MAGIC_100)) { | |
1056 | struct p_header100 *h = header; | |
1057 | if (h->pad != 0) { | |
1058 | conn_err(tconn, "Header padding is not zero\n"); | |
1059 | return -EINVAL; | |
1060 | } | |
1061 | pi->vnr = be16_to_cpu(h->volume); | |
1062 | pi->cmd = be16_to_cpu(h->command); | |
1063 | pi->size = be32_to_cpu(h->length); | |
1064 | } else if (header_size == sizeof(struct p_header95) && | |
1065 | *(__be16 *)header == cpu_to_be16(DRBD_MAGIC_BIG)) { | |
e658983a | 1066 | struct p_header95 *h = header; |
e658983a | 1067 | pi->cmd = be16_to_cpu(h->command); |
b55d84ba AG |
1068 | pi->size = be32_to_cpu(h->length); |
1069 | pi->vnr = 0; | |
e658983a AG |
1070 | } else if (header_size == sizeof(struct p_header80) && |
1071 | *(__be32 *)header == cpu_to_be32(DRBD_MAGIC)) { | |
1072 | struct p_header80 *h = header; | |
1073 | pi->cmd = be16_to_cpu(h->command); | |
1074 | pi->size = be16_to_cpu(h->length); | |
77351055 | 1075 | pi->vnr = 0; |
02918be2 | 1076 | } else { |
e658983a AG |
1077 | conn_err(tconn, "Wrong magic value 0x%08x in protocol version %d\n", |
1078 | be32_to_cpu(*(__be32 *)header), | |
1079 | tconn->agreed_pro_version); | |
8172f3e9 | 1080 | return -EINVAL; |
b411b363 | 1081 | } |
e658983a | 1082 | pi->data = header + header_size; |
8172f3e9 | 1083 | return 0; |
257d0af6 PR |
1084 | } |
1085 | ||
9ba7aa00 | 1086 | static int drbd_recv_header(struct drbd_tconn *tconn, struct packet_info *pi) |
257d0af6 | 1087 | { |
e658983a | 1088 | void *buffer = tconn->data.rbuf; |
69bc7bc3 | 1089 | int err; |
257d0af6 | 1090 | |
e658983a | 1091 | err = drbd_recv_all_warn(tconn, buffer, drbd_header_size(tconn)); |
a5c31904 | 1092 | if (err) |
69bc7bc3 | 1093 | return err; |
257d0af6 | 1094 | |
e658983a | 1095 | err = decode_header(tconn, buffer, pi); |
9ba7aa00 | 1096 | tconn->last_received = jiffies; |
b411b363 | 1097 | |
69bc7bc3 | 1098 | return err; |
b411b363 PR |
1099 | } |
1100 | ||
4b0007c0 | 1101 | static void drbd_flush(struct drbd_tconn *tconn) |
b411b363 PR |
1102 | { |
1103 | int rv; | |
4b0007c0 PR |
1104 | struct drbd_conf *mdev; |
1105 | int vnr; | |
1106 | ||
1107 | if (tconn->write_ordering >= WO_bdev_flush) { | |
615e087f | 1108 | rcu_read_lock(); |
4b0007c0 | 1109 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { |
615e087f LE |
1110 | if (!get_ldev(mdev)) |
1111 | continue; | |
1112 | kref_get(&mdev->kref); | |
1113 | rcu_read_unlock(); | |
1114 | ||
1115 | rv = blkdev_issue_flush(mdev->ldev->backing_bdev, | |
1116 | GFP_NOIO, NULL); | |
1117 | if (rv) { | |
1118 | dev_info(DEV, "local disk flush failed with status %d\n", rv); | |
1119 | /* would rather check on EOPNOTSUPP, but that is not reliable. | |
1120 | * don't try again for ANY return value != 0 | |
1121 | * if (rv == -EOPNOTSUPP) */ | |
1122 | drbd_bump_write_ordering(tconn, WO_drain_io); | |
4b0007c0 | 1123 | } |
615e087f LE |
1124 | put_ldev(mdev); |
1125 | kref_put(&mdev->kref, &drbd_minor_destroy); | |
1126 | ||
1127 | rcu_read_lock(); | |
1128 | if (rv) | |
1129 | break; | |
b411b363 | 1130 | } |
615e087f | 1131 | rcu_read_unlock(); |
b411b363 | 1132 | } |
b411b363 PR |
1133 | } |
1134 | ||
1135 | /** | |
1136 | * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. | |
1137 | * @mdev: DRBD device. | |
1138 | * @epoch: Epoch object. | |
1139 | * @ev: Epoch event. | |
1140 | */ | |
1e9dd291 | 1141 | static enum finish_epoch drbd_may_finish_epoch(struct drbd_tconn *tconn, |
b411b363 PR |
1142 | struct drbd_epoch *epoch, |
1143 | enum epoch_event ev) | |
1144 | { | |
2451fc3b | 1145 | int epoch_size; |
b411b363 | 1146 | struct drbd_epoch *next_epoch; |
b411b363 PR |
1147 | enum finish_epoch rv = FE_STILL_LIVE; |
1148 | ||
12038a3a | 1149 | spin_lock(&tconn->epoch_lock); |
b411b363 PR |
1150 | do { |
1151 | next_epoch = NULL; | |
b411b363 PR |
1152 | |
1153 | epoch_size = atomic_read(&epoch->epoch_size); | |
1154 | ||
1155 | switch (ev & ~EV_CLEANUP) { | |
1156 | case EV_PUT: | |
1157 | atomic_dec(&epoch->active); | |
1158 | break; | |
1159 | case EV_GOT_BARRIER_NR: | |
1160 | set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); | |
b411b363 PR |
1161 | break; |
1162 | case EV_BECAME_LAST: | |
1163 | /* nothing to do*/ | |
1164 | break; | |
1165 | } | |
1166 | ||
b411b363 PR |
1167 | if (epoch_size != 0 && |
1168 | atomic_read(&epoch->active) == 0 && | |
85d73513 | 1169 | (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags) || ev & EV_CLEANUP)) { |
b411b363 | 1170 | if (!(ev & EV_CLEANUP)) { |
12038a3a | 1171 | spin_unlock(&tconn->epoch_lock); |
9ed57dcb | 1172 | drbd_send_b_ack(epoch->tconn, epoch->barrier_nr, epoch_size); |
12038a3a | 1173 | spin_lock(&tconn->epoch_lock); |
b411b363 | 1174 | } |
9ed57dcb LE |
1175 | #if 0 |
1176 | /* FIXME: dec unacked on connection, once we have | |
1177 | * something to count pending connection packets in. */ | |
85d73513 | 1178 | if (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) |
9ed57dcb LE |
1179 | dec_unacked(epoch->tconn); |
1180 | #endif | |
b411b363 | 1181 | |
12038a3a | 1182 | if (tconn->current_epoch != epoch) { |
b411b363 PR |
1183 | next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); |
1184 | list_del(&epoch->list); | |
1185 | ev = EV_BECAME_LAST | (ev & EV_CLEANUP); | |
12038a3a | 1186 | tconn->epochs--; |
b411b363 PR |
1187 | kfree(epoch); |
1188 | ||
1189 | if (rv == FE_STILL_LIVE) | |
1190 | rv = FE_DESTROYED; | |
1191 | } else { | |
1192 | epoch->flags = 0; | |
1193 | atomic_set(&epoch->epoch_size, 0); | |
698f9315 | 1194 | /* atomic_set(&epoch->active, 0); is already zero */ |
b411b363 PR |
1195 | if (rv == FE_STILL_LIVE) |
1196 | rv = FE_RECYCLED; | |
1197 | } | |
1198 | } | |
1199 | ||
1200 | if (!next_epoch) | |
1201 | break; | |
1202 | ||
1203 | epoch = next_epoch; | |
1204 | } while (1); | |
1205 | ||
12038a3a | 1206 | spin_unlock(&tconn->epoch_lock); |
b411b363 | 1207 | |
b411b363 PR |
1208 | return rv; |
1209 | } | |
1210 | ||
1211 | /** | |
1212 | * drbd_bump_write_ordering() - Fall back to an other write ordering method | |
4b0007c0 | 1213 | * @tconn: DRBD connection. |
b411b363 PR |
1214 | * @wo: Write ordering method to try. |
1215 | */ | |
4b0007c0 | 1216 | void drbd_bump_write_ordering(struct drbd_tconn *tconn, enum write_ordering_e wo) |
b411b363 | 1217 | { |
daeda1cc | 1218 | struct disk_conf *dc; |
4b0007c0 | 1219 | struct drbd_conf *mdev; |
b411b363 | 1220 | enum write_ordering_e pwo; |
4b0007c0 | 1221 | int vnr; |
b411b363 PR |
1222 | static char *write_ordering_str[] = { |
1223 | [WO_none] = "none", | |
1224 | [WO_drain_io] = "drain", | |
1225 | [WO_bdev_flush] = "flush", | |
b411b363 PR |
1226 | }; |
1227 | ||
4b0007c0 | 1228 | pwo = tconn->write_ordering; |
b411b363 | 1229 | wo = min(pwo, wo); |
daeda1cc | 1230 | rcu_read_lock(); |
4b0007c0 | 1231 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { |
27eb13e9 | 1232 | if (!get_ldev_if_state(mdev, D_ATTACHING)) |
4b0007c0 PR |
1233 | continue; |
1234 | dc = rcu_dereference(mdev->ldev->disk_conf); | |
1235 | ||
1236 | if (wo == WO_bdev_flush && !dc->disk_flushes) | |
1237 | wo = WO_drain_io; | |
1238 | if (wo == WO_drain_io && !dc->disk_drain) | |
1239 | wo = WO_none; | |
1240 | put_ldev(mdev); | |
1241 | } | |
daeda1cc | 1242 | rcu_read_unlock(); |
4b0007c0 PR |
1243 | tconn->write_ordering = wo; |
1244 | if (pwo != tconn->write_ordering || wo == WO_bdev_flush) | |
1245 | conn_info(tconn, "Method to ensure write ordering: %s\n", write_ordering_str[tconn->write_ordering]); | |
b411b363 PR |
1246 | } |
1247 | ||
45bb912b | 1248 | /** |
fbe29dec | 1249 | * drbd_submit_peer_request() |
45bb912b | 1250 | * @mdev: DRBD device. |
db830c46 | 1251 | * @peer_req: peer request |
45bb912b | 1252 | * @rw: flag field, see bio->bi_rw |
10f6d992 LE |
1253 | * |
1254 | * May spread the pages to multiple bios, | |
1255 | * depending on bio_add_page restrictions. | |
1256 | * | |
1257 | * Returns 0 if all bios have been submitted, | |
1258 | * -ENOMEM if we could not allocate enough bios, | |
1259 | * -ENOSPC (any better suggestion?) if we have not been able to bio_add_page a | |
1260 | * single page to an empty bio (which should never happen and likely indicates | |
1261 | * that the lower level IO stack is in some way broken). This has been observed | |
1262 | * on certain Xen deployments. | |
45bb912b LE |
1263 | */ |
1264 | /* TODO allocate from our own bio_set. */ | |
fbe29dec AG |
1265 | int drbd_submit_peer_request(struct drbd_conf *mdev, |
1266 | struct drbd_peer_request *peer_req, | |
1267 | const unsigned rw, const int fault_type) | |
45bb912b LE |
1268 | { |
1269 | struct bio *bios = NULL; | |
1270 | struct bio *bio; | |
db830c46 AG |
1271 | struct page *page = peer_req->pages; |
1272 | sector_t sector = peer_req->i.sector; | |
1273 | unsigned ds = peer_req->i.size; | |
45bb912b LE |
1274 | unsigned n_bios = 0; |
1275 | unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT; | |
10f6d992 | 1276 | int err = -ENOMEM; |
45bb912b LE |
1277 | |
1278 | /* In most cases, we will only need one bio. But in case the lower | |
1279 | * level restrictions happen to be different at this offset on this | |
1280 | * side than those of the sending peer, we may need to submit the | |
da4a75d2 LE |
1281 | * request in more than one bio. |
1282 | * | |
1283 | * Plain bio_alloc is good enough here, this is no DRBD internally | |
1284 | * generated bio, but a bio allocated on behalf of the peer. | |
1285 | */ | |
45bb912b LE |
1286 | next_bio: |
1287 | bio = bio_alloc(GFP_NOIO, nr_pages); | |
1288 | if (!bio) { | |
1289 | dev_err(DEV, "submit_ee: Allocation of a bio failed\n"); | |
1290 | goto fail; | |
1291 | } | |
db830c46 | 1292 | /* > peer_req->i.sector, unless this is the first bio */ |
45bb912b LE |
1293 | bio->bi_sector = sector; |
1294 | bio->bi_bdev = mdev->ldev->backing_bdev; | |
45bb912b | 1295 | bio->bi_rw = rw; |
db830c46 | 1296 | bio->bi_private = peer_req; |
fcefa62e | 1297 | bio->bi_end_io = drbd_peer_request_endio; |
45bb912b LE |
1298 | |
1299 | bio->bi_next = bios; | |
1300 | bios = bio; | |
1301 | ++n_bios; | |
1302 | ||
1303 | page_chain_for_each(page) { | |
1304 | unsigned len = min_t(unsigned, ds, PAGE_SIZE); | |
1305 | if (!bio_add_page(bio, page, len, 0)) { | |
10f6d992 LE |
1306 | /* A single page must always be possible! |
1307 | * But in case it fails anyways, | |
1308 | * we deal with it, and complain (below). */ | |
1309 | if (bio->bi_vcnt == 0) { | |
1310 | dev_err(DEV, | |
1311 | "bio_add_page failed for len=%u, " | |
1312 | "bi_vcnt=0 (bi_sector=%llu)\n", | |
1313 | len, (unsigned long long)bio->bi_sector); | |
1314 | err = -ENOSPC; | |
1315 | goto fail; | |
1316 | } | |
45bb912b LE |
1317 | goto next_bio; |
1318 | } | |
1319 | ds -= len; | |
1320 | sector += len >> 9; | |
1321 | --nr_pages; | |
1322 | } | |
1323 | D_ASSERT(page == NULL); | |
1324 | D_ASSERT(ds == 0); | |
1325 | ||
db830c46 | 1326 | atomic_set(&peer_req->pending_bios, n_bios); |
45bb912b LE |
1327 | do { |
1328 | bio = bios; | |
1329 | bios = bios->bi_next; | |
1330 | bio->bi_next = NULL; | |
1331 | ||
45bb912b | 1332 | drbd_generic_make_request(mdev, fault_type, bio); |
45bb912b | 1333 | } while (bios); |
45bb912b LE |
1334 | return 0; |
1335 | ||
1336 | fail: | |
1337 | while (bios) { | |
1338 | bio = bios; | |
1339 | bios = bios->bi_next; | |
1340 | bio_put(bio); | |
1341 | } | |
10f6d992 | 1342 | return err; |
45bb912b LE |
1343 | } |
1344 | ||
53840641 | 1345 | static void drbd_remove_epoch_entry_interval(struct drbd_conf *mdev, |
db830c46 | 1346 | struct drbd_peer_request *peer_req) |
53840641 | 1347 | { |
db830c46 | 1348 | struct drbd_interval *i = &peer_req->i; |
53840641 AG |
1349 | |
1350 | drbd_remove_interval(&mdev->write_requests, i); | |
1351 | drbd_clear_interval(i); | |
1352 | ||
6c852bec | 1353 | /* Wake up any processes waiting for this peer request to complete. */ |
53840641 AG |
1354 | if (i->waiting) |
1355 | wake_up(&mdev->misc_wait); | |
1356 | } | |
1357 | ||
77fede51 PR |
1358 | void conn_wait_active_ee_empty(struct drbd_tconn *tconn) |
1359 | { | |
1360 | struct drbd_conf *mdev; | |
1361 | int vnr; | |
1362 | ||
1363 | rcu_read_lock(); | |
1364 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { | |
1365 | kref_get(&mdev->kref); | |
1366 | rcu_read_unlock(); | |
1367 | drbd_wait_ee_list_empty(mdev, &mdev->active_ee); | |
1368 | kref_put(&mdev->kref, &drbd_minor_destroy); | |
1369 | rcu_read_lock(); | |
1370 | } | |
1371 | rcu_read_unlock(); | |
1372 | } | |
1373 | ||
4a76b161 | 1374 | static int receive_Barrier(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 1375 | { |
2451fc3b | 1376 | int rv; |
e658983a | 1377 | struct p_barrier *p = pi->data; |
b411b363 PR |
1378 | struct drbd_epoch *epoch; |
1379 | ||
9ed57dcb LE |
1380 | /* FIXME these are unacked on connection, |
1381 | * not a specific (peer)device. | |
1382 | */ | |
12038a3a | 1383 | tconn->current_epoch->barrier_nr = p->barrier; |
9ed57dcb | 1384 | tconn->current_epoch->tconn = tconn; |
1e9dd291 | 1385 | rv = drbd_may_finish_epoch(tconn, tconn->current_epoch, EV_GOT_BARRIER_NR); |
b411b363 PR |
1386 | |
1387 | /* P_BARRIER_ACK may imply that the corresponding extent is dropped from | |
1388 | * the activity log, which means it would not be resynced in case the | |
1389 | * R_PRIMARY crashes now. | |
1390 | * Therefore we must send the barrier_ack after the barrier request was | |
1391 | * completed. */ | |
4b0007c0 | 1392 | switch (tconn->write_ordering) { |
b411b363 PR |
1393 | case WO_none: |
1394 | if (rv == FE_RECYCLED) | |
82bc0194 | 1395 | return 0; |
2451fc3b PR |
1396 | |
1397 | /* receiver context, in the writeout path of the other node. | |
1398 | * avoid potential distributed deadlock */ | |
1399 | epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); | |
1400 | if (epoch) | |
1401 | break; | |
1402 | else | |
9ed57dcb | 1403 | conn_warn(tconn, "Allocation of an epoch failed, slowing down\n"); |
2451fc3b | 1404 | /* Fall through */ |
b411b363 PR |
1405 | |
1406 | case WO_bdev_flush: | |
1407 | case WO_drain_io: | |
77fede51 | 1408 | conn_wait_active_ee_empty(tconn); |
4b0007c0 | 1409 | drbd_flush(tconn); |
2451fc3b | 1410 | |
12038a3a | 1411 | if (atomic_read(&tconn->current_epoch->epoch_size)) { |
2451fc3b PR |
1412 | epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); |
1413 | if (epoch) | |
1414 | break; | |
b411b363 PR |
1415 | } |
1416 | ||
82bc0194 | 1417 | return 0; |
2451fc3b | 1418 | default: |
9ed57dcb | 1419 | conn_err(tconn, "Strangeness in tconn->write_ordering %d\n", tconn->write_ordering); |
82bc0194 | 1420 | return -EIO; |
b411b363 PR |
1421 | } |
1422 | ||
1423 | epoch->flags = 0; | |
1424 | atomic_set(&epoch->epoch_size, 0); | |
1425 | atomic_set(&epoch->active, 0); | |
1426 | ||
12038a3a PR |
1427 | spin_lock(&tconn->epoch_lock); |
1428 | if (atomic_read(&tconn->current_epoch->epoch_size)) { | |
1429 | list_add(&epoch->list, &tconn->current_epoch->list); | |
1430 | tconn->current_epoch = epoch; | |
1431 | tconn->epochs++; | |
b411b363 PR |
1432 | } else { |
1433 | /* The current_epoch got recycled while we allocated this one... */ | |
1434 | kfree(epoch); | |
1435 | } | |
12038a3a | 1436 | spin_unlock(&tconn->epoch_lock); |
b411b363 | 1437 | |
82bc0194 | 1438 | return 0; |
b411b363 PR |
1439 | } |
1440 | ||
1441 | /* used from receive_RSDataReply (recv_resync_read) | |
1442 | * and from receive_Data */ | |
f6ffca9f AG |
1443 | static struct drbd_peer_request * |
1444 | read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, | |
1445 | int data_size) __must_hold(local) | |
b411b363 | 1446 | { |
6666032a | 1447 | const sector_t capacity = drbd_get_capacity(mdev->this_bdev); |
db830c46 | 1448 | struct drbd_peer_request *peer_req; |
b411b363 | 1449 | struct page *page; |
a5c31904 | 1450 | int dgs, ds, err; |
a0638456 PR |
1451 | void *dig_in = mdev->tconn->int_dig_in; |
1452 | void *dig_vv = mdev->tconn->int_dig_vv; | |
6b4388ac | 1453 | unsigned long *data; |
b411b363 | 1454 | |
88104ca4 AG |
1455 | dgs = 0; |
1456 | if (mdev->tconn->peer_integrity_tfm) { | |
1457 | dgs = crypto_hash_digestsize(mdev->tconn->peer_integrity_tfm); | |
9f5bdc33 AG |
1458 | /* |
1459 | * FIXME: Receive the incoming digest into the receive buffer | |
1460 | * here, together with its struct p_data? | |
1461 | */ | |
a5c31904 AG |
1462 | err = drbd_recv_all_warn(mdev->tconn, dig_in, dgs); |
1463 | if (err) | |
b411b363 | 1464 | return NULL; |
88104ca4 | 1465 | data_size -= dgs; |
b411b363 PR |
1466 | } |
1467 | ||
841ce241 AG |
1468 | if (!expect(data_size != 0)) |
1469 | return NULL; | |
1470 | if (!expect(IS_ALIGNED(data_size, 512))) | |
1471 | return NULL; | |
1472 | if (!expect(data_size <= DRBD_MAX_BIO_SIZE)) | |
1473 | return NULL; | |
b411b363 | 1474 | |
6666032a LE |
1475 | /* even though we trust out peer, |
1476 | * we sometimes have to double check. */ | |
1477 | if (sector + (data_size>>9) > capacity) { | |
fdda6544 LE |
1478 | dev_err(DEV, "request from peer beyond end of local disk: " |
1479 | "capacity: %llus < sector: %llus + size: %u\n", | |
6666032a LE |
1480 | (unsigned long long)capacity, |
1481 | (unsigned long long)sector, data_size); | |
1482 | return NULL; | |
1483 | } | |
1484 | ||
b411b363 PR |
1485 | /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD |
1486 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
1487 | * which in turn might block on the other node at this very place. */ | |
0db55363 | 1488 | peer_req = drbd_alloc_peer_req(mdev, id, sector, data_size, GFP_NOIO); |
db830c46 | 1489 | if (!peer_req) |
b411b363 | 1490 | return NULL; |
45bb912b | 1491 | |
b411b363 | 1492 | ds = data_size; |
db830c46 | 1493 | page = peer_req->pages; |
45bb912b LE |
1494 | page_chain_for_each(page) { |
1495 | unsigned len = min_t(int, ds, PAGE_SIZE); | |
6b4388ac | 1496 | data = kmap(page); |
a5c31904 | 1497 | err = drbd_recv_all_warn(mdev->tconn, data, len); |
0cf9d27e | 1498 | if (drbd_insert_fault(mdev, DRBD_FAULT_RECEIVE)) { |
6b4388ac PR |
1499 | dev_err(DEV, "Fault injection: Corrupting data on receive\n"); |
1500 | data[0] = data[0] ^ (unsigned long)-1; | |
1501 | } | |
b411b363 | 1502 | kunmap(page); |
a5c31904 | 1503 | if (err) { |
3967deb1 | 1504 | drbd_free_peer_req(mdev, peer_req); |
b411b363 PR |
1505 | return NULL; |
1506 | } | |
a5c31904 | 1507 | ds -= len; |
b411b363 PR |
1508 | } |
1509 | ||
1510 | if (dgs) { | |
5b614abe | 1511 | drbd_csum_ee(mdev, mdev->tconn->peer_integrity_tfm, peer_req, dig_vv); |
b411b363 | 1512 | if (memcmp(dig_in, dig_vv, dgs)) { |
470be44a LE |
1513 | dev_err(DEV, "Digest integrity check FAILED: %llus +%u\n", |
1514 | (unsigned long long)sector, data_size); | |
3967deb1 | 1515 | drbd_free_peer_req(mdev, peer_req); |
b411b363 PR |
1516 | return NULL; |
1517 | } | |
1518 | } | |
1519 | mdev->recv_cnt += data_size>>9; | |
db830c46 | 1520 | return peer_req; |
b411b363 PR |
1521 | } |
1522 | ||
1523 | /* drbd_drain_block() just takes a data block | |
1524 | * out of the socket input buffer, and discards it. | |
1525 | */ | |
1526 | static int drbd_drain_block(struct drbd_conf *mdev, int data_size) | |
1527 | { | |
1528 | struct page *page; | |
a5c31904 | 1529 | int err = 0; |
b411b363 PR |
1530 | void *data; |
1531 | ||
c3470cde | 1532 | if (!data_size) |
fc5be839 | 1533 | return 0; |
c3470cde | 1534 | |
c37c8ecf | 1535 | page = drbd_alloc_pages(mdev, 1, 1); |
b411b363 PR |
1536 | |
1537 | data = kmap(page); | |
1538 | while (data_size) { | |
fc5be839 AG |
1539 | unsigned int len = min_t(int, data_size, PAGE_SIZE); |
1540 | ||
a5c31904 AG |
1541 | err = drbd_recv_all_warn(mdev->tconn, data, len); |
1542 | if (err) | |
b411b363 | 1543 | break; |
a5c31904 | 1544 | data_size -= len; |
b411b363 PR |
1545 | } |
1546 | kunmap(page); | |
5cc287e0 | 1547 | drbd_free_pages(mdev, page, 0); |
fc5be839 | 1548 | return err; |
b411b363 PR |
1549 | } |
1550 | ||
1551 | static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req, | |
1552 | sector_t sector, int data_size) | |
1553 | { | |
1554 | struct bio_vec *bvec; | |
1555 | struct bio *bio; | |
a5c31904 | 1556 | int dgs, err, i, expect; |
a0638456 PR |
1557 | void *dig_in = mdev->tconn->int_dig_in; |
1558 | void *dig_vv = mdev->tconn->int_dig_vv; | |
b411b363 | 1559 | |
88104ca4 AG |
1560 | dgs = 0; |
1561 | if (mdev->tconn->peer_integrity_tfm) { | |
1562 | dgs = crypto_hash_digestsize(mdev->tconn->peer_integrity_tfm); | |
a5c31904 AG |
1563 | err = drbd_recv_all_warn(mdev->tconn, dig_in, dgs); |
1564 | if (err) | |
1565 | return err; | |
88104ca4 | 1566 | data_size -= dgs; |
b411b363 PR |
1567 | } |
1568 | ||
b411b363 PR |
1569 | /* optimistically update recv_cnt. if receiving fails below, |
1570 | * we disconnect anyways, and counters will be reset. */ | |
1571 | mdev->recv_cnt += data_size>>9; | |
1572 | ||
1573 | bio = req->master_bio; | |
1574 | D_ASSERT(sector == bio->bi_sector); | |
1575 | ||
1576 | bio_for_each_segment(bvec, bio, i) { | |
a5c31904 | 1577 | void *mapped = kmap(bvec->bv_page) + bvec->bv_offset; |
b411b363 | 1578 | expect = min_t(int, data_size, bvec->bv_len); |
a5c31904 | 1579 | err = drbd_recv_all_warn(mdev->tconn, mapped, expect); |
b411b363 | 1580 | kunmap(bvec->bv_page); |
a5c31904 AG |
1581 | if (err) |
1582 | return err; | |
1583 | data_size -= expect; | |
b411b363 PR |
1584 | } |
1585 | ||
1586 | if (dgs) { | |
5b614abe | 1587 | drbd_csum_bio(mdev, mdev->tconn->peer_integrity_tfm, bio, dig_vv); |
b411b363 PR |
1588 | if (memcmp(dig_in, dig_vv, dgs)) { |
1589 | dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n"); | |
28284cef | 1590 | return -EINVAL; |
b411b363 PR |
1591 | } |
1592 | } | |
1593 | ||
1594 | D_ASSERT(data_size == 0); | |
28284cef | 1595 | return 0; |
b411b363 PR |
1596 | } |
1597 | ||
a990be46 AG |
1598 | /* |
1599 | * e_end_resync_block() is called in asender context via | |
1600 | * drbd_finish_peer_reqs(). | |
1601 | */ | |
99920dc5 | 1602 | static int e_end_resync_block(struct drbd_work *w, int unused) |
b411b363 | 1603 | { |
8050e6d0 AG |
1604 | struct drbd_peer_request *peer_req = |
1605 | container_of(w, struct drbd_peer_request, w); | |
00d56944 | 1606 | struct drbd_conf *mdev = w->mdev; |
db830c46 | 1607 | sector_t sector = peer_req->i.sector; |
99920dc5 | 1608 | int err; |
b411b363 | 1609 | |
db830c46 | 1610 | D_ASSERT(drbd_interval_empty(&peer_req->i)); |
b411b363 | 1611 | |
db830c46 AG |
1612 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
1613 | drbd_set_in_sync(mdev, sector, peer_req->i.size); | |
99920dc5 | 1614 | err = drbd_send_ack(mdev, P_RS_WRITE_ACK, peer_req); |
b411b363 PR |
1615 | } else { |
1616 | /* Record failure to sync */ | |
db830c46 | 1617 | drbd_rs_failed_io(mdev, sector, peer_req->i.size); |
b411b363 | 1618 | |
99920dc5 | 1619 | err = drbd_send_ack(mdev, P_NEG_ACK, peer_req); |
b411b363 PR |
1620 | } |
1621 | dec_unacked(mdev); | |
1622 | ||
99920dc5 | 1623 | return err; |
b411b363 PR |
1624 | } |
1625 | ||
1626 | static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local) | |
1627 | { | |
db830c46 | 1628 | struct drbd_peer_request *peer_req; |
b411b363 | 1629 | |
db830c46 AG |
1630 | peer_req = read_in_block(mdev, ID_SYNCER, sector, data_size); |
1631 | if (!peer_req) | |
45bb912b | 1632 | goto fail; |
b411b363 PR |
1633 | |
1634 | dec_rs_pending(mdev); | |
1635 | ||
b411b363 PR |
1636 | inc_unacked(mdev); |
1637 | /* corresponding dec_unacked() in e_end_resync_block() | |
1638 | * respective _drbd_clear_done_ee */ | |
1639 | ||
db830c46 | 1640 | peer_req->w.cb = e_end_resync_block; |
45bb912b | 1641 | |
87eeee41 | 1642 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 | 1643 | list_add(&peer_req->w.list, &mdev->sync_ee); |
87eeee41 | 1644 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 1645 | |
0f0601f4 | 1646 | atomic_add(data_size >> 9, &mdev->rs_sect_ev); |
fbe29dec | 1647 | if (drbd_submit_peer_request(mdev, peer_req, WRITE, DRBD_FAULT_RS_WR) == 0) |
e1c1b0fc | 1648 | return 0; |
b411b363 | 1649 | |
10f6d992 LE |
1650 | /* don't care for the reason here */ |
1651 | dev_err(DEV, "submit failed, triggering re-connect\n"); | |
87eeee41 | 1652 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 | 1653 | list_del(&peer_req->w.list); |
87eeee41 | 1654 | spin_unlock_irq(&mdev->tconn->req_lock); |
22cc37a9 | 1655 | |
3967deb1 | 1656 | drbd_free_peer_req(mdev, peer_req); |
45bb912b LE |
1657 | fail: |
1658 | put_ldev(mdev); | |
e1c1b0fc | 1659 | return -EIO; |
b411b363 PR |
1660 | } |
1661 | ||
668eebc6 | 1662 | static struct drbd_request * |
bc9c5c41 AG |
1663 | find_request(struct drbd_conf *mdev, struct rb_root *root, u64 id, |
1664 | sector_t sector, bool missing_ok, const char *func) | |
51624585 | 1665 | { |
51624585 AG |
1666 | struct drbd_request *req; |
1667 | ||
bc9c5c41 AG |
1668 | /* Request object according to our peer */ |
1669 | req = (struct drbd_request *)(unsigned long)id; | |
5e472264 | 1670 | if (drbd_contains_interval(root, sector, &req->i) && req->i.local) |
668eebc6 | 1671 | return req; |
c3afd8f5 | 1672 | if (!missing_ok) { |
5af172ed | 1673 | dev_err(DEV, "%s: failed to find request 0x%lx, sector %llus\n", func, |
c3afd8f5 AG |
1674 | (unsigned long)id, (unsigned long long)sector); |
1675 | } | |
51624585 AG |
1676 | return NULL; |
1677 | } | |
1678 | ||
4a76b161 | 1679 | static int receive_DataReply(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 1680 | { |
4a76b161 | 1681 | struct drbd_conf *mdev; |
b411b363 PR |
1682 | struct drbd_request *req; |
1683 | sector_t sector; | |
82bc0194 | 1684 | int err; |
e658983a | 1685 | struct p_data *p = pi->data; |
4a76b161 AG |
1686 | |
1687 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
1688 | if (!mdev) | |
1689 | return -EIO; | |
b411b363 PR |
1690 | |
1691 | sector = be64_to_cpu(p->sector); | |
1692 | ||
87eeee41 | 1693 | spin_lock_irq(&mdev->tconn->req_lock); |
bc9c5c41 | 1694 | req = find_request(mdev, &mdev->read_requests, p->block_id, sector, false, __func__); |
87eeee41 | 1695 | spin_unlock_irq(&mdev->tconn->req_lock); |
c3afd8f5 | 1696 | if (unlikely(!req)) |
82bc0194 | 1697 | return -EIO; |
b411b363 | 1698 | |
24c4830c | 1699 | /* hlist_del(&req->collision) is done in _req_may_be_done, to avoid |
b411b363 PR |
1700 | * special casing it there for the various failure cases. |
1701 | * still no race with drbd_fail_pending_reads */ | |
e2857216 | 1702 | err = recv_dless_read(mdev, req, sector, pi->size); |
82bc0194 | 1703 | if (!err) |
8554df1c | 1704 | req_mod(req, DATA_RECEIVED); |
b411b363 PR |
1705 | /* else: nothing. handled from drbd_disconnect... |
1706 | * I don't think we may complete this just yet | |
1707 | * in case we are "on-disconnect: freeze" */ | |
1708 | ||
82bc0194 | 1709 | return err; |
b411b363 PR |
1710 | } |
1711 | ||
4a76b161 | 1712 | static int receive_RSDataReply(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 1713 | { |
4a76b161 | 1714 | struct drbd_conf *mdev; |
b411b363 | 1715 | sector_t sector; |
82bc0194 | 1716 | int err; |
e658983a | 1717 | struct p_data *p = pi->data; |
4a76b161 AG |
1718 | |
1719 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
1720 | if (!mdev) | |
1721 | return -EIO; | |
b411b363 PR |
1722 | |
1723 | sector = be64_to_cpu(p->sector); | |
1724 | D_ASSERT(p->block_id == ID_SYNCER); | |
1725 | ||
1726 | if (get_ldev(mdev)) { | |
1727 | /* data is submitted to disk within recv_resync_read. | |
1728 | * corresponding put_ldev done below on error, | |
fcefa62e | 1729 | * or in drbd_peer_request_endio. */ |
e2857216 | 1730 | err = recv_resync_read(mdev, sector, pi->size); |
b411b363 PR |
1731 | } else { |
1732 | if (__ratelimit(&drbd_ratelimit_state)) | |
1733 | dev_err(DEV, "Can not write resync data to local disk.\n"); | |
1734 | ||
e2857216 | 1735 | err = drbd_drain_block(mdev, pi->size); |
b411b363 | 1736 | |
e2857216 | 1737 | drbd_send_ack_dp(mdev, P_NEG_ACK, p, pi->size); |
b411b363 PR |
1738 | } |
1739 | ||
e2857216 | 1740 | atomic_add(pi->size >> 9, &mdev->rs_sect_in); |
778f271d | 1741 | |
82bc0194 | 1742 | return err; |
b411b363 PR |
1743 | } |
1744 | ||
7be8da07 AG |
1745 | static void restart_conflicting_writes(struct drbd_conf *mdev, |
1746 | sector_t sector, int size) | |
1747 | { | |
1748 | struct drbd_interval *i; | |
1749 | struct drbd_request *req; | |
1750 | ||
1751 | drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { | |
1752 | if (!i->local) | |
1753 | continue; | |
1754 | req = container_of(i, struct drbd_request, i); | |
1755 | if (req->rq_state & RQ_LOCAL_PENDING || | |
1756 | !(req->rq_state & RQ_POSTPONED)) | |
1757 | continue; | |
2312f0b3 LE |
1758 | /* as it is RQ_POSTPONED, this will cause it to |
1759 | * be queued on the retry workqueue. */ | |
1760 | __req_mod(req, DISCARD_WRITE, NULL); | |
7be8da07 AG |
1761 | } |
1762 | } | |
1763 | ||
a990be46 AG |
1764 | /* |
1765 | * e_end_block() is called in asender context via drbd_finish_peer_reqs(). | |
b411b363 | 1766 | */ |
99920dc5 | 1767 | static int e_end_block(struct drbd_work *w, int cancel) |
b411b363 | 1768 | { |
8050e6d0 AG |
1769 | struct drbd_peer_request *peer_req = |
1770 | container_of(w, struct drbd_peer_request, w); | |
00d56944 | 1771 | struct drbd_conf *mdev = w->mdev; |
db830c46 | 1772 | sector_t sector = peer_req->i.sector; |
99920dc5 | 1773 | int err = 0, pcmd; |
b411b363 | 1774 | |
303d1448 | 1775 | if (peer_req->flags & EE_SEND_WRITE_ACK) { |
db830c46 | 1776 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
1777 | pcmd = (mdev->state.conn >= C_SYNC_SOURCE && |
1778 | mdev->state.conn <= C_PAUSED_SYNC_T && | |
db830c46 | 1779 | peer_req->flags & EE_MAY_SET_IN_SYNC) ? |
b411b363 | 1780 | P_RS_WRITE_ACK : P_WRITE_ACK; |
99920dc5 | 1781 | err = drbd_send_ack(mdev, pcmd, peer_req); |
b411b363 | 1782 | if (pcmd == P_RS_WRITE_ACK) |
db830c46 | 1783 | drbd_set_in_sync(mdev, sector, peer_req->i.size); |
b411b363 | 1784 | } else { |
99920dc5 | 1785 | err = drbd_send_ack(mdev, P_NEG_ACK, peer_req); |
b411b363 PR |
1786 | /* we expect it to be marked out of sync anyways... |
1787 | * maybe assert this? */ | |
1788 | } | |
1789 | dec_unacked(mdev); | |
1790 | } | |
1791 | /* we delete from the conflict detection hash _after_ we sent out the | |
1792 | * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ | |
302bdeae | 1793 | if (peer_req->flags & EE_IN_INTERVAL_TREE) { |
87eeee41 | 1794 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 AG |
1795 | D_ASSERT(!drbd_interval_empty(&peer_req->i)); |
1796 | drbd_remove_epoch_entry_interval(mdev, peer_req); | |
7be8da07 AG |
1797 | if (peer_req->flags & EE_RESTART_REQUESTS) |
1798 | restart_conflicting_writes(mdev, sector, peer_req->i.size); | |
87eeee41 | 1799 | spin_unlock_irq(&mdev->tconn->req_lock); |
bb3bfe96 | 1800 | } else |
db830c46 | 1801 | D_ASSERT(drbd_interval_empty(&peer_req->i)); |
b411b363 | 1802 | |
1e9dd291 | 1803 | drbd_may_finish_epoch(mdev->tconn, peer_req->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); |
b411b363 | 1804 | |
99920dc5 | 1805 | return err; |
b411b363 PR |
1806 | } |
1807 | ||
7be8da07 | 1808 | static int e_send_ack(struct drbd_work *w, enum drbd_packet ack) |
b411b363 | 1809 | { |
7be8da07 | 1810 | struct drbd_conf *mdev = w->mdev; |
8050e6d0 AG |
1811 | struct drbd_peer_request *peer_req = |
1812 | container_of(w, struct drbd_peer_request, w); | |
99920dc5 | 1813 | int err; |
b411b363 | 1814 | |
99920dc5 | 1815 | err = drbd_send_ack(mdev, ack, peer_req); |
b411b363 PR |
1816 | dec_unacked(mdev); |
1817 | ||
99920dc5 | 1818 | return err; |
b411b363 PR |
1819 | } |
1820 | ||
99920dc5 | 1821 | static int e_send_discard_write(struct drbd_work *w, int unused) |
7be8da07 AG |
1822 | { |
1823 | return e_send_ack(w, P_DISCARD_WRITE); | |
1824 | } | |
1825 | ||
99920dc5 | 1826 | static int e_send_retry_write(struct drbd_work *w, int unused) |
7be8da07 AG |
1827 | { |
1828 | struct drbd_tconn *tconn = w->mdev->tconn; | |
1829 | ||
1830 | return e_send_ack(w, tconn->agreed_pro_version >= 100 ? | |
1831 | P_RETRY_WRITE : P_DISCARD_WRITE); | |
1832 | } | |
1833 | ||
3e394da1 AG |
1834 | static bool seq_greater(u32 a, u32 b) |
1835 | { | |
1836 | /* | |
1837 | * We assume 32-bit wrap-around here. | |
1838 | * For 24-bit wrap-around, we would have to shift: | |
1839 | * a <<= 8; b <<= 8; | |
1840 | */ | |
1841 | return (s32)a - (s32)b > 0; | |
1842 | } | |
1843 | ||
1844 | static u32 seq_max(u32 a, u32 b) | |
1845 | { | |
1846 | return seq_greater(a, b) ? a : b; | |
1847 | } | |
1848 | ||
7be8da07 AG |
1849 | static bool need_peer_seq(struct drbd_conf *mdev) |
1850 | { | |
1851 | struct drbd_tconn *tconn = mdev->tconn; | |
302bdeae | 1852 | int tp; |
7be8da07 AG |
1853 | |
1854 | /* | |
1855 | * We only need to keep track of the last packet_seq number of our peer | |
1856 | * if we are in dual-primary mode and we have the discard flag set; see | |
1857 | * handle_write_conflicts(). | |
1858 | */ | |
302bdeae PR |
1859 | |
1860 | rcu_read_lock(); | |
1861 | tp = rcu_dereference(mdev->tconn->net_conf)->two_primaries; | |
1862 | rcu_read_unlock(); | |
1863 | ||
1864 | return tp && test_bit(DISCARD_CONCURRENT, &tconn->flags); | |
7be8da07 AG |
1865 | } |
1866 | ||
43ae077d | 1867 | static void update_peer_seq(struct drbd_conf *mdev, unsigned int peer_seq) |
3e394da1 | 1868 | { |
3c13b680 | 1869 | unsigned int newest_peer_seq; |
3e394da1 | 1870 | |
7be8da07 AG |
1871 | if (need_peer_seq(mdev)) { |
1872 | spin_lock(&mdev->peer_seq_lock); | |
3c13b680 LE |
1873 | newest_peer_seq = seq_max(mdev->peer_seq, peer_seq); |
1874 | mdev->peer_seq = newest_peer_seq; | |
7be8da07 | 1875 | spin_unlock(&mdev->peer_seq_lock); |
3c13b680 LE |
1876 | /* wake up only if we actually changed mdev->peer_seq */ |
1877 | if (peer_seq == newest_peer_seq) | |
7be8da07 AG |
1878 | wake_up(&mdev->seq_wait); |
1879 | } | |
3e394da1 AG |
1880 | } |
1881 | ||
d93f6302 LE |
1882 | static inline int overlaps(sector_t s1, int l1, sector_t s2, int l2) |
1883 | { | |
1884 | return !((s1 + (l1>>9) <= s2) || (s1 >= s2 + (l2>>9))); | |
1885 | } | |
1886 | ||
1887 | /* maybe change sync_ee into interval trees as well? */ | |
1888 | static bool overlaping_resync_write(struct drbd_conf *mdev, struct drbd_peer_request *peer_req) | |
1889 | { | |
1890 | struct drbd_peer_request *rs_req; | |
1891 | bool rv = 0; | |
1892 | ||
1893 | spin_lock_irq(&mdev->tconn->req_lock); | |
1894 | list_for_each_entry(rs_req, &mdev->sync_ee, w.list) { | |
1895 | if (overlaps(peer_req->i.sector, peer_req->i.size, | |
1896 | rs_req->i.sector, rs_req->i.size)) { | |
1897 | rv = 1; | |
1898 | break; | |
1899 | } | |
1900 | } | |
1901 | spin_unlock_irq(&mdev->tconn->req_lock); | |
1902 | ||
1903 | if (rv) | |
1904 | dev_warn(DEV, "WARN: Avoiding concurrent data/resync write to single sector.\n"); | |
1905 | ||
1906 | return rv; | |
1907 | } | |
1908 | ||
b411b363 PR |
1909 | /* Called from receive_Data. |
1910 | * Synchronize packets on sock with packets on msock. | |
1911 | * | |
1912 | * This is here so even when a P_DATA packet traveling via sock overtook an Ack | |
1913 | * packet traveling on msock, they are still processed in the order they have | |
1914 | * been sent. | |
1915 | * | |
1916 | * Note: we don't care for Ack packets overtaking P_DATA packets. | |
1917 | * | |
1918 | * In case packet_seq is larger than mdev->peer_seq number, there are | |
1919 | * outstanding packets on the msock. We wait for them to arrive. | |
1920 | * In case we are the logically next packet, we update mdev->peer_seq | |
1921 | * ourselves. Correctly handles 32bit wrap around. | |
1922 | * | |
1923 | * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, | |
1924 | * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds | |
1925 | * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have | |
1926 | * 1<<9 == 512 seconds aka ages for the 32bit wrap around... | |
1927 | * | |
1928 | * returns 0 if we may process the packet, | |
1929 | * -ERESTARTSYS if we were interrupted (by disconnect signal). */ | |
7be8da07 | 1930 | static int wait_for_and_update_peer_seq(struct drbd_conf *mdev, const u32 peer_seq) |
b411b363 PR |
1931 | { |
1932 | DEFINE_WAIT(wait); | |
b411b363 | 1933 | long timeout; |
7be8da07 AG |
1934 | int ret; |
1935 | ||
1936 | if (!need_peer_seq(mdev)) | |
1937 | return 0; | |
1938 | ||
b411b363 PR |
1939 | spin_lock(&mdev->peer_seq_lock); |
1940 | for (;;) { | |
7be8da07 AG |
1941 | if (!seq_greater(peer_seq - 1, mdev->peer_seq)) { |
1942 | mdev->peer_seq = seq_max(mdev->peer_seq, peer_seq); | |
1943 | ret = 0; | |
b411b363 | 1944 | break; |
7be8da07 | 1945 | } |
b411b363 PR |
1946 | if (signal_pending(current)) { |
1947 | ret = -ERESTARTSYS; | |
1948 | break; | |
1949 | } | |
7be8da07 | 1950 | prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE); |
b411b363 | 1951 | spin_unlock(&mdev->peer_seq_lock); |
44ed167d PR |
1952 | rcu_read_lock(); |
1953 | timeout = rcu_dereference(mdev->tconn->net_conf)->ping_timeo*HZ/10; | |
1954 | rcu_read_unlock(); | |
71b1c1eb | 1955 | timeout = schedule_timeout(timeout); |
b411b363 | 1956 | spin_lock(&mdev->peer_seq_lock); |
7be8da07 | 1957 | if (!timeout) { |
b411b363 | 1958 | ret = -ETIMEDOUT; |
71b1c1eb | 1959 | dev_err(DEV, "Timed out waiting for missing ack packets; disconnecting\n"); |
b411b363 PR |
1960 | break; |
1961 | } | |
1962 | } | |
b411b363 | 1963 | spin_unlock(&mdev->peer_seq_lock); |
7be8da07 | 1964 | finish_wait(&mdev->seq_wait, &wait); |
b411b363 PR |
1965 | return ret; |
1966 | } | |
1967 | ||
688593c5 LE |
1968 | /* see also bio_flags_to_wire() |
1969 | * DRBD_REQ_*, because we need to semantically map the flags to data packet | |
1970 | * flags and back. We may replicate to other kernel versions. */ | |
1971 | static unsigned long wire_flags_to_bio(struct drbd_conf *mdev, u32 dpf) | |
76d2e7ec | 1972 | { |
688593c5 LE |
1973 | return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | |
1974 | (dpf & DP_FUA ? REQ_FUA : 0) | | |
1975 | (dpf & DP_FLUSH ? REQ_FLUSH : 0) | | |
1976 | (dpf & DP_DISCARD ? REQ_DISCARD : 0); | |
76d2e7ec PR |
1977 | } |
1978 | ||
7be8da07 AG |
1979 | static void fail_postponed_requests(struct drbd_conf *mdev, sector_t sector, |
1980 | unsigned int size) | |
1981 | { | |
1982 | struct drbd_interval *i; | |
1983 | ||
1984 | repeat: | |
1985 | drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { | |
1986 | struct drbd_request *req; | |
1987 | struct bio_and_error m; | |
1988 | ||
1989 | if (!i->local) | |
1990 | continue; | |
1991 | req = container_of(i, struct drbd_request, i); | |
1992 | if (!(req->rq_state & RQ_POSTPONED)) | |
1993 | continue; | |
1994 | req->rq_state &= ~RQ_POSTPONED; | |
1995 | __req_mod(req, NEG_ACKED, &m); | |
1996 | spin_unlock_irq(&mdev->tconn->req_lock); | |
1997 | if (m.bio) | |
1998 | complete_master_bio(mdev, &m); | |
1999 | spin_lock_irq(&mdev->tconn->req_lock); | |
2000 | goto repeat; | |
2001 | } | |
2002 | } | |
2003 | ||
2004 | static int handle_write_conflicts(struct drbd_conf *mdev, | |
2005 | struct drbd_peer_request *peer_req) | |
2006 | { | |
2007 | struct drbd_tconn *tconn = mdev->tconn; | |
2008 | bool resolve_conflicts = test_bit(DISCARD_CONCURRENT, &tconn->flags); | |
2009 | sector_t sector = peer_req->i.sector; | |
2010 | const unsigned int size = peer_req->i.size; | |
2011 | struct drbd_interval *i; | |
2012 | bool equal; | |
2013 | int err; | |
2014 | ||
2015 | /* | |
2016 | * Inserting the peer request into the write_requests tree will prevent | |
2017 | * new conflicting local requests from being added. | |
2018 | */ | |
2019 | drbd_insert_interval(&mdev->write_requests, &peer_req->i); | |
2020 | ||
2021 | repeat: | |
2022 | drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { | |
2023 | if (i == &peer_req->i) | |
2024 | continue; | |
2025 | ||
2026 | if (!i->local) { | |
2027 | /* | |
2028 | * Our peer has sent a conflicting remote request; this | |
2029 | * should not happen in a two-node setup. Wait for the | |
2030 | * earlier peer request to complete. | |
2031 | */ | |
2032 | err = drbd_wait_misc(mdev, i); | |
2033 | if (err) | |
2034 | goto out; | |
2035 | goto repeat; | |
2036 | } | |
2037 | ||
2038 | equal = i->sector == sector && i->size == size; | |
2039 | if (resolve_conflicts) { | |
2040 | /* | |
2041 | * If the peer request is fully contained within the | |
2042 | * overlapping request, it can be discarded; otherwise, | |
2043 | * it will be retried once all overlapping requests | |
2044 | * have completed. | |
2045 | */ | |
2046 | bool discard = i->sector <= sector && i->sector + | |
2047 | (i->size >> 9) >= sector + (size >> 9); | |
2048 | ||
2049 | if (!equal) | |
2050 | dev_alert(DEV, "Concurrent writes detected: " | |
2051 | "local=%llus +%u, remote=%llus +%u, " | |
2052 | "assuming %s came first\n", | |
2053 | (unsigned long long)i->sector, i->size, | |
2054 | (unsigned long long)sector, size, | |
2055 | discard ? "local" : "remote"); | |
2056 | ||
2057 | inc_unacked(mdev); | |
2058 | peer_req->w.cb = discard ? e_send_discard_write : | |
2059 | e_send_retry_write; | |
2060 | list_add_tail(&peer_req->w.list, &mdev->done_ee); | |
2061 | wake_asender(mdev->tconn); | |
2062 | ||
2063 | err = -ENOENT; | |
2064 | goto out; | |
2065 | } else { | |
2066 | struct drbd_request *req = | |
2067 | container_of(i, struct drbd_request, i); | |
2068 | ||
2069 | if (!equal) | |
2070 | dev_alert(DEV, "Concurrent writes detected: " | |
2071 | "local=%llus +%u, remote=%llus +%u\n", | |
2072 | (unsigned long long)i->sector, i->size, | |
2073 | (unsigned long long)sector, size); | |
2074 | ||
2075 | if (req->rq_state & RQ_LOCAL_PENDING || | |
2076 | !(req->rq_state & RQ_POSTPONED)) { | |
2077 | /* | |
2078 | * Wait for the node with the discard flag to | |
2079 | * decide if this request will be discarded or | |
2080 | * retried. Requests that are discarded will | |
2081 | * disappear from the write_requests tree. | |
2082 | * | |
2083 | * In addition, wait for the conflicting | |
2084 | * request to finish locally before submitting | |
2085 | * the conflicting peer request. | |
2086 | */ | |
2087 | err = drbd_wait_misc(mdev, &req->i); | |
2088 | if (err) { | |
2089 | _conn_request_state(mdev->tconn, | |
2090 | NS(conn, C_TIMEOUT), | |
2091 | CS_HARD); | |
2092 | fail_postponed_requests(mdev, sector, size); | |
2093 | goto out; | |
2094 | } | |
2095 | goto repeat; | |
2096 | } | |
2097 | /* | |
2098 | * Remember to restart the conflicting requests after | |
2099 | * the new peer request has completed. | |
2100 | */ | |
2101 | peer_req->flags |= EE_RESTART_REQUESTS; | |
2102 | } | |
2103 | } | |
2104 | err = 0; | |
2105 | ||
2106 | out: | |
2107 | if (err) | |
2108 | drbd_remove_epoch_entry_interval(mdev, peer_req); | |
2109 | return err; | |
2110 | } | |
2111 | ||
b411b363 | 2112 | /* mirrored write */ |
4a76b161 | 2113 | static int receive_Data(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 2114 | { |
4a76b161 | 2115 | struct drbd_conf *mdev; |
b411b363 | 2116 | sector_t sector; |
db830c46 | 2117 | struct drbd_peer_request *peer_req; |
e658983a | 2118 | struct p_data *p = pi->data; |
7be8da07 | 2119 | u32 peer_seq = be32_to_cpu(p->seq_num); |
b411b363 PR |
2120 | int rw = WRITE; |
2121 | u32 dp_flags; | |
302bdeae | 2122 | int err, tp; |
b411b363 | 2123 | |
4a76b161 AG |
2124 | mdev = vnr_to_mdev(tconn, pi->vnr); |
2125 | if (!mdev) | |
2126 | return -EIO; | |
2127 | ||
7be8da07 | 2128 | if (!get_ldev(mdev)) { |
82bc0194 AG |
2129 | int err2; |
2130 | ||
7be8da07 | 2131 | err = wait_for_and_update_peer_seq(mdev, peer_seq); |
e2857216 | 2132 | drbd_send_ack_dp(mdev, P_NEG_ACK, p, pi->size); |
12038a3a | 2133 | atomic_inc(&tconn->current_epoch->epoch_size); |
e2857216 | 2134 | err2 = drbd_drain_block(mdev, pi->size); |
82bc0194 AG |
2135 | if (!err) |
2136 | err = err2; | |
2137 | return err; | |
b411b363 PR |
2138 | } |
2139 | ||
fcefa62e AG |
2140 | /* |
2141 | * Corresponding put_ldev done either below (on various errors), or in | |
2142 | * drbd_peer_request_endio, if we successfully submit the data at the | |
2143 | * end of this function. | |
2144 | */ | |
b411b363 PR |
2145 | |
2146 | sector = be64_to_cpu(p->sector); | |
e2857216 | 2147 | peer_req = read_in_block(mdev, p->block_id, sector, pi->size); |
db830c46 | 2148 | if (!peer_req) { |
b411b363 | 2149 | put_ldev(mdev); |
82bc0194 | 2150 | return -EIO; |
b411b363 PR |
2151 | } |
2152 | ||
db830c46 | 2153 | peer_req->w.cb = e_end_block; |
b411b363 | 2154 | |
688593c5 LE |
2155 | dp_flags = be32_to_cpu(p->dp_flags); |
2156 | rw |= wire_flags_to_bio(mdev, dp_flags); | |
2157 | ||
2158 | if (dp_flags & DP_MAY_SET_IN_SYNC) | |
db830c46 | 2159 | peer_req->flags |= EE_MAY_SET_IN_SYNC; |
688593c5 | 2160 | |
12038a3a PR |
2161 | spin_lock(&tconn->epoch_lock); |
2162 | peer_req->epoch = tconn->current_epoch; | |
db830c46 AG |
2163 | atomic_inc(&peer_req->epoch->epoch_size); |
2164 | atomic_inc(&peer_req->epoch->active); | |
12038a3a | 2165 | spin_unlock(&tconn->epoch_lock); |
b411b363 | 2166 | |
302bdeae PR |
2167 | rcu_read_lock(); |
2168 | tp = rcu_dereference(mdev->tconn->net_conf)->two_primaries; | |
2169 | rcu_read_unlock(); | |
2170 | if (tp) { | |
2171 | peer_req->flags |= EE_IN_INTERVAL_TREE; | |
7be8da07 AG |
2172 | err = wait_for_and_update_peer_seq(mdev, peer_seq); |
2173 | if (err) | |
b411b363 | 2174 | goto out_interrupted; |
87eeee41 | 2175 | spin_lock_irq(&mdev->tconn->req_lock); |
7be8da07 AG |
2176 | err = handle_write_conflicts(mdev, peer_req); |
2177 | if (err) { | |
2178 | spin_unlock_irq(&mdev->tconn->req_lock); | |
2179 | if (err == -ENOENT) { | |
b411b363 | 2180 | put_ldev(mdev); |
82bc0194 | 2181 | return 0; |
b411b363 | 2182 | } |
7be8da07 | 2183 | goto out_interrupted; |
b411b363 | 2184 | } |
7be8da07 AG |
2185 | } else |
2186 | spin_lock_irq(&mdev->tconn->req_lock); | |
db830c46 | 2187 | list_add(&peer_req->w.list, &mdev->active_ee); |
87eeee41 | 2188 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 2189 | |
d93f6302 LE |
2190 | if (mdev->state.conn == C_SYNC_TARGET) |
2191 | wait_event(mdev->ee_wait, !overlaping_resync_write(mdev, peer_req)); | |
2192 | ||
303d1448 | 2193 | if (mdev->tconn->agreed_pro_version < 100) { |
44ed167d PR |
2194 | rcu_read_lock(); |
2195 | switch (rcu_dereference(mdev->tconn->net_conf)->wire_protocol) { | |
303d1448 PR |
2196 | case DRBD_PROT_C: |
2197 | dp_flags |= DP_SEND_WRITE_ACK; | |
2198 | break; | |
2199 | case DRBD_PROT_B: | |
2200 | dp_flags |= DP_SEND_RECEIVE_ACK; | |
2201 | break; | |
2202 | } | |
44ed167d | 2203 | rcu_read_unlock(); |
303d1448 PR |
2204 | } |
2205 | ||
2206 | if (dp_flags & DP_SEND_WRITE_ACK) { | |
2207 | peer_req->flags |= EE_SEND_WRITE_ACK; | |
b411b363 PR |
2208 | inc_unacked(mdev); |
2209 | /* corresponding dec_unacked() in e_end_block() | |
2210 | * respective _drbd_clear_done_ee */ | |
303d1448 PR |
2211 | } |
2212 | ||
2213 | if (dp_flags & DP_SEND_RECEIVE_ACK) { | |
b411b363 PR |
2214 | /* I really don't like it that the receiver thread |
2215 | * sends on the msock, but anyways */ | |
db830c46 | 2216 | drbd_send_ack(mdev, P_RECV_ACK, peer_req); |
b411b363 PR |
2217 | } |
2218 | ||
6719fb03 | 2219 | if (mdev->state.pdsk < D_INCONSISTENT) { |
b411b363 | 2220 | /* In case we have the only disk of the cluster, */ |
db830c46 AG |
2221 | drbd_set_out_of_sync(mdev, peer_req->i.sector, peer_req->i.size); |
2222 | peer_req->flags |= EE_CALL_AL_COMPLETE_IO; | |
2223 | peer_req->flags &= ~EE_MAY_SET_IN_SYNC; | |
181286ad | 2224 | drbd_al_begin_io(mdev, &peer_req->i); |
b411b363 PR |
2225 | } |
2226 | ||
82bc0194 AG |
2227 | err = drbd_submit_peer_request(mdev, peer_req, rw, DRBD_FAULT_DT_WR); |
2228 | if (!err) | |
2229 | return 0; | |
b411b363 | 2230 | |
10f6d992 LE |
2231 | /* don't care for the reason here */ |
2232 | dev_err(DEV, "submit failed, triggering re-connect\n"); | |
87eeee41 | 2233 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 AG |
2234 | list_del(&peer_req->w.list); |
2235 | drbd_remove_epoch_entry_interval(mdev, peer_req); | |
87eeee41 | 2236 | spin_unlock_irq(&mdev->tconn->req_lock); |
db830c46 | 2237 | if (peer_req->flags & EE_CALL_AL_COMPLETE_IO) |
181286ad | 2238 | drbd_al_complete_io(mdev, &peer_req->i); |
22cc37a9 | 2239 | |
b411b363 | 2240 | out_interrupted: |
1e9dd291 | 2241 | drbd_may_finish_epoch(tconn, peer_req->epoch, EV_PUT + EV_CLEANUP); |
b411b363 | 2242 | put_ldev(mdev); |
3967deb1 | 2243 | drbd_free_peer_req(mdev, peer_req); |
82bc0194 | 2244 | return err; |
b411b363 PR |
2245 | } |
2246 | ||
0f0601f4 LE |
2247 | /* We may throttle resync, if the lower device seems to be busy, |
2248 | * and current sync rate is above c_min_rate. | |
2249 | * | |
2250 | * To decide whether or not the lower device is busy, we use a scheme similar | |
2251 | * to MD RAID is_mddev_idle(): if the partition stats reveal "significant" | |
2252 | * (more than 64 sectors) of activity we cannot account for with our own resync | |
2253 | * activity, it obviously is "busy". | |
2254 | * | |
2255 | * The current sync rate used here uses only the most recent two step marks, | |
2256 | * to have a short time average so we can react faster. | |
2257 | */ | |
e3555d85 | 2258 | int drbd_rs_should_slow_down(struct drbd_conf *mdev, sector_t sector) |
0f0601f4 LE |
2259 | { |
2260 | struct gendisk *disk = mdev->ldev->backing_bdev->bd_contains->bd_disk; | |
2261 | unsigned long db, dt, dbdt; | |
e3555d85 | 2262 | struct lc_element *tmp; |
0f0601f4 LE |
2263 | int curr_events; |
2264 | int throttle = 0; | |
daeda1cc PR |
2265 | unsigned int c_min_rate; |
2266 | ||
2267 | rcu_read_lock(); | |
2268 | c_min_rate = rcu_dereference(mdev->ldev->disk_conf)->c_min_rate; | |
2269 | rcu_read_unlock(); | |
0f0601f4 LE |
2270 | |
2271 | /* feature disabled? */ | |
daeda1cc | 2272 | if (c_min_rate == 0) |
0f0601f4 LE |
2273 | return 0; |
2274 | ||
e3555d85 PR |
2275 | spin_lock_irq(&mdev->al_lock); |
2276 | tmp = lc_find(mdev->resync, BM_SECT_TO_EXT(sector)); | |
2277 | if (tmp) { | |
2278 | struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); | |
2279 | if (test_bit(BME_PRIORITY, &bm_ext->flags)) { | |
2280 | spin_unlock_irq(&mdev->al_lock); | |
2281 | return 0; | |
2282 | } | |
2283 | /* Do not slow down if app IO is already waiting for this extent */ | |
2284 | } | |
2285 | spin_unlock_irq(&mdev->al_lock); | |
2286 | ||
0f0601f4 LE |
2287 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
2288 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
2289 | atomic_read(&mdev->rs_sect_ev); | |
e3555d85 | 2290 | |
0f0601f4 LE |
2291 | if (!mdev->rs_last_events || curr_events - mdev->rs_last_events > 64) { |
2292 | unsigned long rs_left; | |
2293 | int i; | |
2294 | ||
2295 | mdev->rs_last_events = curr_events; | |
2296 | ||
2297 | /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, | |
2298 | * approx. */ | |
2649f080 LE |
2299 | i = (mdev->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; |
2300 | ||
2301 | if (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T) | |
2302 | rs_left = mdev->ov_left; | |
2303 | else | |
2304 | rs_left = drbd_bm_total_weight(mdev) - mdev->rs_failed; | |
0f0601f4 LE |
2305 | |
2306 | dt = ((long)jiffies - (long)mdev->rs_mark_time[i]) / HZ; | |
2307 | if (!dt) | |
2308 | dt++; | |
2309 | db = mdev->rs_mark_left[i] - rs_left; | |
2310 | dbdt = Bit2KB(db/dt); | |
2311 | ||
daeda1cc | 2312 | if (dbdt > c_min_rate) |
0f0601f4 LE |
2313 | throttle = 1; |
2314 | } | |
2315 | return throttle; | |
2316 | } | |
2317 | ||
2318 | ||
4a76b161 | 2319 | static int receive_DataRequest(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 2320 | { |
4a76b161 | 2321 | struct drbd_conf *mdev; |
b411b363 | 2322 | sector_t sector; |
4a76b161 | 2323 | sector_t capacity; |
db830c46 | 2324 | struct drbd_peer_request *peer_req; |
b411b363 | 2325 | struct digest_info *di = NULL; |
b18b37be | 2326 | int size, verb; |
b411b363 | 2327 | unsigned int fault_type; |
e658983a | 2328 | struct p_block_req *p = pi->data; |
4a76b161 AG |
2329 | |
2330 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
2331 | if (!mdev) | |
2332 | return -EIO; | |
2333 | capacity = drbd_get_capacity(mdev->this_bdev); | |
b411b363 PR |
2334 | |
2335 | sector = be64_to_cpu(p->sector); | |
2336 | size = be32_to_cpu(p->blksize); | |
2337 | ||
c670a398 | 2338 | if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) { |
b411b363 PR |
2339 | dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, |
2340 | (unsigned long long)sector, size); | |
82bc0194 | 2341 | return -EINVAL; |
b411b363 PR |
2342 | } |
2343 | if (sector + (size>>9) > capacity) { | |
2344 | dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, | |
2345 | (unsigned long long)sector, size); | |
82bc0194 | 2346 | return -EINVAL; |
b411b363 PR |
2347 | } |
2348 | ||
2349 | if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) { | |
b18b37be | 2350 | verb = 1; |
e2857216 | 2351 | switch (pi->cmd) { |
b18b37be PR |
2352 | case P_DATA_REQUEST: |
2353 | drbd_send_ack_rp(mdev, P_NEG_DREPLY, p); | |
2354 | break; | |
2355 | case P_RS_DATA_REQUEST: | |
2356 | case P_CSUM_RS_REQUEST: | |
2357 | case P_OV_REQUEST: | |
2358 | drbd_send_ack_rp(mdev, P_NEG_RS_DREPLY , p); | |
2359 | break; | |
2360 | case P_OV_REPLY: | |
2361 | verb = 0; | |
2362 | dec_rs_pending(mdev); | |
2363 | drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, ID_IN_SYNC); | |
2364 | break; | |
2365 | default: | |
49ba9b1b | 2366 | BUG(); |
b18b37be PR |
2367 | } |
2368 | if (verb && __ratelimit(&drbd_ratelimit_state)) | |
b411b363 PR |
2369 | dev_err(DEV, "Can not satisfy peer's read request, " |
2370 | "no local data.\n"); | |
b18b37be | 2371 | |
a821cc4a | 2372 | /* drain possibly payload */ |
e2857216 | 2373 | return drbd_drain_block(mdev, pi->size); |
b411b363 PR |
2374 | } |
2375 | ||
2376 | /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD | |
2377 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
2378 | * which in turn might block on the other node at this very place. */ | |
0db55363 | 2379 | peer_req = drbd_alloc_peer_req(mdev, p->block_id, sector, size, GFP_NOIO); |
db830c46 | 2380 | if (!peer_req) { |
b411b363 | 2381 | put_ldev(mdev); |
82bc0194 | 2382 | return -ENOMEM; |
b411b363 PR |
2383 | } |
2384 | ||
e2857216 | 2385 | switch (pi->cmd) { |
b411b363 | 2386 | case P_DATA_REQUEST: |
db830c46 | 2387 | peer_req->w.cb = w_e_end_data_req; |
b411b363 | 2388 | fault_type = DRBD_FAULT_DT_RD; |
80a40e43 LE |
2389 | /* application IO, don't drbd_rs_begin_io */ |
2390 | goto submit; | |
2391 | ||
b411b363 | 2392 | case P_RS_DATA_REQUEST: |
db830c46 | 2393 | peer_req->w.cb = w_e_end_rsdata_req; |
b411b363 | 2394 | fault_type = DRBD_FAULT_RS_RD; |
5f9915bb LE |
2395 | /* used in the sector offset progress display */ |
2396 | mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); | |
b411b363 PR |
2397 | break; |
2398 | ||
2399 | case P_OV_REPLY: | |
2400 | case P_CSUM_RS_REQUEST: | |
2401 | fault_type = DRBD_FAULT_RS_RD; | |
e2857216 | 2402 | di = kmalloc(sizeof(*di) + pi->size, GFP_NOIO); |
b411b363 PR |
2403 | if (!di) |
2404 | goto out_free_e; | |
2405 | ||
e2857216 | 2406 | di->digest_size = pi->size; |
b411b363 PR |
2407 | di->digest = (((char *)di)+sizeof(struct digest_info)); |
2408 | ||
db830c46 AG |
2409 | peer_req->digest = di; |
2410 | peer_req->flags |= EE_HAS_DIGEST; | |
c36c3ced | 2411 | |
e2857216 | 2412 | if (drbd_recv_all(mdev->tconn, di->digest, pi->size)) |
b411b363 PR |
2413 | goto out_free_e; |
2414 | ||
e2857216 | 2415 | if (pi->cmd == P_CSUM_RS_REQUEST) { |
31890f4a | 2416 | D_ASSERT(mdev->tconn->agreed_pro_version >= 89); |
db830c46 | 2417 | peer_req->w.cb = w_e_end_csum_rs_req; |
5f9915bb LE |
2418 | /* used in the sector offset progress display */ |
2419 | mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); | |
e2857216 | 2420 | } else if (pi->cmd == P_OV_REPLY) { |
2649f080 LE |
2421 | /* track progress, we may need to throttle */ |
2422 | atomic_add(size >> 9, &mdev->rs_sect_in); | |
db830c46 | 2423 | peer_req->w.cb = w_e_end_ov_reply; |
b411b363 | 2424 | dec_rs_pending(mdev); |
0f0601f4 LE |
2425 | /* drbd_rs_begin_io done when we sent this request, |
2426 | * but accounting still needs to be done. */ | |
2427 | goto submit_for_resync; | |
b411b363 PR |
2428 | } |
2429 | break; | |
2430 | ||
2431 | case P_OV_REQUEST: | |
b411b363 | 2432 | if (mdev->ov_start_sector == ~(sector_t)0 && |
31890f4a | 2433 | mdev->tconn->agreed_pro_version >= 90) { |
de228bba LE |
2434 | unsigned long now = jiffies; |
2435 | int i; | |
b411b363 PR |
2436 | mdev->ov_start_sector = sector; |
2437 | mdev->ov_position = sector; | |
30b743a2 LE |
2438 | mdev->ov_left = drbd_bm_bits(mdev) - BM_SECT_TO_BIT(sector); |
2439 | mdev->rs_total = mdev->ov_left; | |
de228bba LE |
2440 | for (i = 0; i < DRBD_SYNC_MARKS; i++) { |
2441 | mdev->rs_mark_left[i] = mdev->ov_left; | |
2442 | mdev->rs_mark_time[i] = now; | |
2443 | } | |
b411b363 PR |
2444 | dev_info(DEV, "Online Verify start sector: %llu\n", |
2445 | (unsigned long long)sector); | |
2446 | } | |
db830c46 | 2447 | peer_req->w.cb = w_e_end_ov_req; |
b411b363 | 2448 | fault_type = DRBD_FAULT_RS_RD; |
b411b363 PR |
2449 | break; |
2450 | ||
b411b363 | 2451 | default: |
49ba9b1b | 2452 | BUG(); |
b411b363 PR |
2453 | } |
2454 | ||
0f0601f4 LE |
2455 | /* Throttle, drbd_rs_begin_io and submit should become asynchronous |
2456 | * wrt the receiver, but it is not as straightforward as it may seem. | |
2457 | * Various places in the resync start and stop logic assume resync | |
2458 | * requests are processed in order, requeuing this on the worker thread | |
2459 | * introduces a bunch of new code for synchronization between threads. | |
2460 | * | |
2461 | * Unlimited throttling before drbd_rs_begin_io may stall the resync | |
2462 | * "forever", throttling after drbd_rs_begin_io will lock that extent | |
2463 | * for application writes for the same time. For now, just throttle | |
2464 | * here, where the rest of the code expects the receiver to sleep for | |
2465 | * a while, anyways. | |
2466 | */ | |
2467 | ||
2468 | /* Throttle before drbd_rs_begin_io, as that locks out application IO; | |
2469 | * this defers syncer requests for some time, before letting at least | |
2470 | * on request through. The resync controller on the receiving side | |
2471 | * will adapt to the incoming rate accordingly. | |
2472 | * | |
2473 | * We cannot throttle here if remote is Primary/SyncTarget: | |
2474 | * we would also throttle its application reads. | |
2475 | * In that case, throttling is done on the SyncTarget only. | |
2476 | */ | |
e3555d85 PR |
2477 | if (mdev->state.peer != R_PRIMARY && drbd_rs_should_slow_down(mdev, sector)) |
2478 | schedule_timeout_uninterruptible(HZ/10); | |
2479 | if (drbd_rs_begin_io(mdev, sector)) | |
80a40e43 | 2480 | goto out_free_e; |
b411b363 | 2481 | |
0f0601f4 LE |
2482 | submit_for_resync: |
2483 | atomic_add(size >> 9, &mdev->rs_sect_ev); | |
2484 | ||
80a40e43 | 2485 | submit: |
b411b363 | 2486 | inc_unacked(mdev); |
87eeee41 | 2487 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 | 2488 | list_add_tail(&peer_req->w.list, &mdev->read_ee); |
87eeee41 | 2489 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 2490 | |
fbe29dec | 2491 | if (drbd_submit_peer_request(mdev, peer_req, READ, fault_type) == 0) |
82bc0194 | 2492 | return 0; |
b411b363 | 2493 | |
10f6d992 LE |
2494 | /* don't care for the reason here */ |
2495 | dev_err(DEV, "submit failed, triggering re-connect\n"); | |
87eeee41 | 2496 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 | 2497 | list_del(&peer_req->w.list); |
87eeee41 | 2498 | spin_unlock_irq(&mdev->tconn->req_lock); |
22cc37a9 LE |
2499 | /* no drbd_rs_complete_io(), we are dropping the connection anyways */ |
2500 | ||
b411b363 | 2501 | out_free_e: |
b411b363 | 2502 | put_ldev(mdev); |
3967deb1 | 2503 | drbd_free_peer_req(mdev, peer_req); |
82bc0194 | 2504 | return -EIO; |
b411b363 PR |
2505 | } |
2506 | ||
2507 | static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local) | |
2508 | { | |
2509 | int self, peer, rv = -100; | |
2510 | unsigned long ch_self, ch_peer; | |
44ed167d | 2511 | enum drbd_after_sb_p after_sb_0p; |
b411b363 PR |
2512 | |
2513 | self = mdev->ldev->md.uuid[UI_BITMAP] & 1; | |
2514 | peer = mdev->p_uuid[UI_BITMAP] & 1; | |
2515 | ||
2516 | ch_peer = mdev->p_uuid[UI_SIZE]; | |
2517 | ch_self = mdev->comm_bm_set; | |
2518 | ||
44ed167d PR |
2519 | rcu_read_lock(); |
2520 | after_sb_0p = rcu_dereference(mdev->tconn->net_conf)->after_sb_0p; | |
2521 | rcu_read_unlock(); | |
2522 | switch (after_sb_0p) { | |
b411b363 PR |
2523 | case ASB_CONSENSUS: |
2524 | case ASB_DISCARD_SECONDARY: | |
2525 | case ASB_CALL_HELPER: | |
44ed167d | 2526 | case ASB_VIOLENTLY: |
b411b363 PR |
2527 | dev_err(DEV, "Configuration error.\n"); |
2528 | break; | |
2529 | case ASB_DISCONNECT: | |
2530 | break; | |
2531 | case ASB_DISCARD_YOUNGER_PRI: | |
2532 | if (self == 0 && peer == 1) { | |
2533 | rv = -1; | |
2534 | break; | |
2535 | } | |
2536 | if (self == 1 && peer == 0) { | |
2537 | rv = 1; | |
2538 | break; | |
2539 | } | |
2540 | /* Else fall through to one of the other strategies... */ | |
2541 | case ASB_DISCARD_OLDER_PRI: | |
2542 | if (self == 0 && peer == 1) { | |
2543 | rv = 1; | |
2544 | break; | |
2545 | } | |
2546 | if (self == 1 && peer == 0) { | |
2547 | rv = -1; | |
2548 | break; | |
2549 | } | |
2550 | /* Else fall through to one of the other strategies... */ | |
ad19bf6e | 2551 | dev_warn(DEV, "Discard younger/older primary did not find a decision\n" |
b411b363 PR |
2552 | "Using discard-least-changes instead\n"); |
2553 | case ASB_DISCARD_ZERO_CHG: | |
2554 | if (ch_peer == 0 && ch_self == 0) { | |
25703f83 | 2555 | rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) |
b411b363 PR |
2556 | ? -1 : 1; |
2557 | break; | |
2558 | } else { | |
2559 | if (ch_peer == 0) { rv = 1; break; } | |
2560 | if (ch_self == 0) { rv = -1; break; } | |
2561 | } | |
44ed167d | 2562 | if (after_sb_0p == ASB_DISCARD_ZERO_CHG) |
b411b363 PR |
2563 | break; |
2564 | case ASB_DISCARD_LEAST_CHG: | |
2565 | if (ch_self < ch_peer) | |
2566 | rv = -1; | |
2567 | else if (ch_self > ch_peer) | |
2568 | rv = 1; | |
2569 | else /* ( ch_self == ch_peer ) */ | |
2570 | /* Well, then use something else. */ | |
25703f83 | 2571 | rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) |
b411b363 PR |
2572 | ? -1 : 1; |
2573 | break; | |
2574 | case ASB_DISCARD_LOCAL: | |
2575 | rv = -1; | |
2576 | break; | |
2577 | case ASB_DISCARD_REMOTE: | |
2578 | rv = 1; | |
2579 | } | |
2580 | ||
2581 | return rv; | |
2582 | } | |
2583 | ||
2584 | static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local) | |
2585 | { | |
6184ea21 | 2586 | int hg, rv = -100; |
44ed167d | 2587 | enum drbd_after_sb_p after_sb_1p; |
b411b363 | 2588 | |
44ed167d PR |
2589 | rcu_read_lock(); |
2590 | after_sb_1p = rcu_dereference(mdev->tconn->net_conf)->after_sb_1p; | |
2591 | rcu_read_unlock(); | |
2592 | switch (after_sb_1p) { | |
b411b363 PR |
2593 | case ASB_DISCARD_YOUNGER_PRI: |
2594 | case ASB_DISCARD_OLDER_PRI: | |
2595 | case ASB_DISCARD_LEAST_CHG: | |
2596 | case ASB_DISCARD_LOCAL: | |
2597 | case ASB_DISCARD_REMOTE: | |
44ed167d | 2598 | case ASB_DISCARD_ZERO_CHG: |
b411b363 PR |
2599 | dev_err(DEV, "Configuration error.\n"); |
2600 | break; | |
2601 | case ASB_DISCONNECT: | |
2602 | break; | |
2603 | case ASB_CONSENSUS: | |
2604 | hg = drbd_asb_recover_0p(mdev); | |
2605 | if (hg == -1 && mdev->state.role == R_SECONDARY) | |
2606 | rv = hg; | |
2607 | if (hg == 1 && mdev->state.role == R_PRIMARY) | |
2608 | rv = hg; | |
2609 | break; | |
2610 | case ASB_VIOLENTLY: | |
2611 | rv = drbd_asb_recover_0p(mdev); | |
2612 | break; | |
2613 | case ASB_DISCARD_SECONDARY: | |
2614 | return mdev->state.role == R_PRIMARY ? 1 : -1; | |
2615 | case ASB_CALL_HELPER: | |
2616 | hg = drbd_asb_recover_0p(mdev); | |
2617 | if (hg == -1 && mdev->state.role == R_PRIMARY) { | |
bb437946 AG |
2618 | enum drbd_state_rv rv2; |
2619 | ||
2620 | drbd_set_role(mdev, R_SECONDARY, 0); | |
b411b363 PR |
2621 | /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, |
2622 | * we might be here in C_WF_REPORT_PARAMS which is transient. | |
2623 | * we do not need to wait for the after state change work either. */ | |
bb437946 AG |
2624 | rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); |
2625 | if (rv2 != SS_SUCCESS) { | |
b411b363 PR |
2626 | drbd_khelper(mdev, "pri-lost-after-sb"); |
2627 | } else { | |
2628 | dev_warn(DEV, "Successfully gave up primary role.\n"); | |
2629 | rv = hg; | |
2630 | } | |
2631 | } else | |
2632 | rv = hg; | |
2633 | } | |
2634 | ||
2635 | return rv; | |
2636 | } | |
2637 | ||
2638 | static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local) | |
2639 | { | |
6184ea21 | 2640 | int hg, rv = -100; |
44ed167d | 2641 | enum drbd_after_sb_p after_sb_2p; |
b411b363 | 2642 | |
44ed167d PR |
2643 | rcu_read_lock(); |
2644 | after_sb_2p = rcu_dereference(mdev->tconn->net_conf)->after_sb_2p; | |
2645 | rcu_read_unlock(); | |
2646 | switch (after_sb_2p) { | |
b411b363 PR |
2647 | case ASB_DISCARD_YOUNGER_PRI: |
2648 | case ASB_DISCARD_OLDER_PRI: | |
2649 | case ASB_DISCARD_LEAST_CHG: | |
2650 | case ASB_DISCARD_LOCAL: | |
2651 | case ASB_DISCARD_REMOTE: | |
2652 | case ASB_CONSENSUS: | |
2653 | case ASB_DISCARD_SECONDARY: | |
44ed167d | 2654 | case ASB_DISCARD_ZERO_CHG: |
b411b363 PR |
2655 | dev_err(DEV, "Configuration error.\n"); |
2656 | break; | |
2657 | case ASB_VIOLENTLY: | |
2658 | rv = drbd_asb_recover_0p(mdev); | |
2659 | break; | |
2660 | case ASB_DISCONNECT: | |
2661 | break; | |
2662 | case ASB_CALL_HELPER: | |
2663 | hg = drbd_asb_recover_0p(mdev); | |
2664 | if (hg == -1) { | |
bb437946 AG |
2665 | enum drbd_state_rv rv2; |
2666 | ||
b411b363 PR |
2667 | /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, |
2668 | * we might be here in C_WF_REPORT_PARAMS which is transient. | |
2669 | * we do not need to wait for the after state change work either. */ | |
bb437946 AG |
2670 | rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); |
2671 | if (rv2 != SS_SUCCESS) { | |
b411b363 PR |
2672 | drbd_khelper(mdev, "pri-lost-after-sb"); |
2673 | } else { | |
2674 | dev_warn(DEV, "Successfully gave up primary role.\n"); | |
2675 | rv = hg; | |
2676 | } | |
2677 | } else | |
2678 | rv = hg; | |
2679 | } | |
2680 | ||
2681 | return rv; | |
2682 | } | |
2683 | ||
2684 | static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid, | |
2685 | u64 bits, u64 flags) | |
2686 | { | |
2687 | if (!uuid) { | |
2688 | dev_info(DEV, "%s uuid info vanished while I was looking!\n", text); | |
2689 | return; | |
2690 | } | |
2691 | dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", | |
2692 | text, | |
2693 | (unsigned long long)uuid[UI_CURRENT], | |
2694 | (unsigned long long)uuid[UI_BITMAP], | |
2695 | (unsigned long long)uuid[UI_HISTORY_START], | |
2696 | (unsigned long long)uuid[UI_HISTORY_END], | |
2697 | (unsigned long long)bits, | |
2698 | (unsigned long long)flags); | |
2699 | } | |
2700 | ||
2701 | /* | |
2702 | 100 after split brain try auto recover | |
2703 | 2 C_SYNC_SOURCE set BitMap | |
2704 | 1 C_SYNC_SOURCE use BitMap | |
2705 | 0 no Sync | |
2706 | -1 C_SYNC_TARGET use BitMap | |
2707 | -2 C_SYNC_TARGET set BitMap | |
2708 | -100 after split brain, disconnect | |
2709 | -1000 unrelated data | |
4a23f264 PR |
2710 | -1091 requires proto 91 |
2711 | -1096 requires proto 96 | |
b411b363 PR |
2712 | */ |
2713 | static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local) | |
2714 | { | |
2715 | u64 self, peer; | |
2716 | int i, j; | |
2717 | ||
2718 | self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); | |
2719 | peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); | |
2720 | ||
2721 | *rule_nr = 10; | |
2722 | if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) | |
2723 | return 0; | |
2724 | ||
2725 | *rule_nr = 20; | |
2726 | if ((self == UUID_JUST_CREATED || self == (u64)0) && | |
2727 | peer != UUID_JUST_CREATED) | |
2728 | return -2; | |
2729 | ||
2730 | *rule_nr = 30; | |
2731 | if (self != UUID_JUST_CREATED && | |
2732 | (peer == UUID_JUST_CREATED || peer == (u64)0)) | |
2733 | return 2; | |
2734 | ||
2735 | if (self == peer) { | |
2736 | int rct, dc; /* roles at crash time */ | |
2737 | ||
2738 | if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) { | |
2739 | ||
31890f4a | 2740 | if (mdev->tconn->agreed_pro_version < 91) |
4a23f264 | 2741 | return -1091; |
b411b363 PR |
2742 | |
2743 | if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) && | |
2744 | (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { | |
2745 | dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n"); | |
2746 | drbd_uuid_set_bm(mdev, 0UL); | |
2747 | ||
2748 | drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, | |
2749 | mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); | |
2750 | *rule_nr = 34; | |
2751 | } else { | |
2752 | dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n"); | |
2753 | *rule_nr = 36; | |
2754 | } | |
2755 | ||
2756 | return 1; | |
2757 | } | |
2758 | ||
2759 | if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) { | |
2760 | ||
31890f4a | 2761 | if (mdev->tconn->agreed_pro_version < 91) |
4a23f264 | 2762 | return -1091; |
b411b363 PR |
2763 | |
2764 | if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) && | |
2765 | (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) { | |
2766 | dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); | |
2767 | ||
2768 | mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START]; | |
2769 | mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP]; | |
2770 | mdev->p_uuid[UI_BITMAP] = 0UL; | |
2771 | ||
2772 | drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); | |
2773 | *rule_nr = 35; | |
2774 | } else { | |
2775 | dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n"); | |
2776 | *rule_nr = 37; | |
2777 | } | |
2778 | ||
2779 | return -1; | |
2780 | } | |
2781 | ||
2782 | /* Common power [off|failure] */ | |
2783 | rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) + | |
2784 | (mdev->p_uuid[UI_FLAGS] & 2); | |
2785 | /* lowest bit is set when we were primary, | |
2786 | * next bit (weight 2) is set when peer was primary */ | |
2787 | *rule_nr = 40; | |
2788 | ||
2789 | switch (rct) { | |
2790 | case 0: /* !self_pri && !peer_pri */ return 0; | |
2791 | case 1: /* self_pri && !peer_pri */ return 1; | |
2792 | case 2: /* !self_pri && peer_pri */ return -1; | |
2793 | case 3: /* self_pri && peer_pri */ | |
25703f83 | 2794 | dc = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags); |
b411b363 PR |
2795 | return dc ? -1 : 1; |
2796 | } | |
2797 | } | |
2798 | ||
2799 | *rule_nr = 50; | |
2800 | peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); | |
2801 | if (self == peer) | |
2802 | return -1; | |
2803 | ||
2804 | *rule_nr = 51; | |
2805 | peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); | |
2806 | if (self == peer) { | |
31890f4a | 2807 | if (mdev->tconn->agreed_pro_version < 96 ? |
4a23f264 PR |
2808 | (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == |
2809 | (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) : | |
2810 | peer + UUID_NEW_BM_OFFSET == (mdev->p_uuid[UI_BITMAP] & ~((u64)1))) { | |
b411b363 PR |
2811 | /* The last P_SYNC_UUID did not get though. Undo the last start of |
2812 | resync as sync source modifications of the peer's UUIDs. */ | |
2813 | ||
31890f4a | 2814 | if (mdev->tconn->agreed_pro_version < 91) |
4a23f264 | 2815 | return -1091; |
b411b363 PR |
2816 | |
2817 | mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START]; | |
2818 | mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1]; | |
4a23f264 PR |
2819 | |
2820 | dev_info(DEV, "Did not got last syncUUID packet, corrected:\n"); | |
2821 | drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); | |
2822 | ||
b411b363 PR |
2823 | return -1; |
2824 | } | |
2825 | } | |
2826 | ||
2827 | *rule_nr = 60; | |
2828 | self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); | |
2829 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { | |
2830 | peer = mdev->p_uuid[i] & ~((u64)1); | |
2831 | if (self == peer) | |
2832 | return -2; | |
2833 | } | |
2834 | ||
2835 | *rule_nr = 70; | |
2836 | self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); | |
2837 | peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); | |
2838 | if (self == peer) | |
2839 | return 1; | |
2840 | ||
2841 | *rule_nr = 71; | |
2842 | self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); | |
2843 | if (self == peer) { | |
31890f4a | 2844 | if (mdev->tconn->agreed_pro_version < 96 ? |
4a23f264 PR |
2845 | (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == |
2846 | (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) : | |
2847 | self + UUID_NEW_BM_OFFSET == (mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) { | |
b411b363 PR |
2848 | /* The last P_SYNC_UUID did not get though. Undo the last start of |
2849 | resync as sync source modifications of our UUIDs. */ | |
2850 | ||
31890f4a | 2851 | if (mdev->tconn->agreed_pro_version < 91) |
4a23f264 | 2852 | return -1091; |
b411b363 PR |
2853 | |
2854 | _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]); | |
2855 | _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]); | |
2856 | ||
4a23f264 | 2857 | dev_info(DEV, "Last syncUUID did not get through, corrected:\n"); |
b411b363 PR |
2858 | drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, |
2859 | mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); | |
2860 | ||
2861 | return 1; | |
2862 | } | |
2863 | } | |
2864 | ||
2865 | ||
2866 | *rule_nr = 80; | |
d8c2a36b | 2867 | peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); |
b411b363 PR |
2868 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { |
2869 | self = mdev->ldev->md.uuid[i] & ~((u64)1); | |
2870 | if (self == peer) | |
2871 | return 2; | |
2872 | } | |
2873 | ||
2874 | *rule_nr = 90; | |
2875 | self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); | |
2876 | peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); | |
2877 | if (self == peer && self != ((u64)0)) | |
2878 | return 100; | |
2879 | ||
2880 | *rule_nr = 100; | |
2881 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { | |
2882 | self = mdev->ldev->md.uuid[i] & ~((u64)1); | |
2883 | for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { | |
2884 | peer = mdev->p_uuid[j] & ~((u64)1); | |
2885 | if (self == peer) | |
2886 | return -100; | |
2887 | } | |
2888 | } | |
2889 | ||
2890 | return -1000; | |
2891 | } | |
2892 | ||
2893 | /* drbd_sync_handshake() returns the new conn state on success, or | |
2894 | CONN_MASK (-1) on failure. | |
2895 | */ | |
2896 | static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role, | |
2897 | enum drbd_disk_state peer_disk) __must_hold(local) | |
2898 | { | |
b411b363 PR |
2899 | enum drbd_conns rv = C_MASK; |
2900 | enum drbd_disk_state mydisk; | |
44ed167d | 2901 | struct net_conf *nc; |
6dff2902 | 2902 | int hg, rule_nr, rr_conflict, tentative; |
b411b363 PR |
2903 | |
2904 | mydisk = mdev->state.disk; | |
2905 | if (mydisk == D_NEGOTIATING) | |
2906 | mydisk = mdev->new_state_tmp.disk; | |
2907 | ||
2908 | dev_info(DEV, "drbd_sync_handshake:\n"); | |
2909 | drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0); | |
2910 | drbd_uuid_dump(mdev, "peer", mdev->p_uuid, | |
2911 | mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); | |
2912 | ||
2913 | hg = drbd_uuid_compare(mdev, &rule_nr); | |
2914 | ||
2915 | dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr); | |
2916 | ||
2917 | if (hg == -1000) { | |
2918 | dev_alert(DEV, "Unrelated data, aborting!\n"); | |
2919 | return C_MASK; | |
2920 | } | |
4a23f264 PR |
2921 | if (hg < -1000) { |
2922 | dev_alert(DEV, "To resolve this both sides have to support at least protocol %d\n", -hg - 1000); | |
b411b363 PR |
2923 | return C_MASK; |
2924 | } | |
2925 | ||
2926 | if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || | |
2927 | (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { | |
2928 | int f = (hg == -100) || abs(hg) == 2; | |
2929 | hg = mydisk > D_INCONSISTENT ? 1 : -1; | |
2930 | if (f) | |
2931 | hg = hg*2; | |
2932 | dev_info(DEV, "Becoming sync %s due to disk states.\n", | |
2933 | hg > 0 ? "source" : "target"); | |
2934 | } | |
2935 | ||
3a11a487 AG |
2936 | if (abs(hg) == 100) |
2937 | drbd_khelper(mdev, "initial-split-brain"); | |
2938 | ||
44ed167d PR |
2939 | rcu_read_lock(); |
2940 | nc = rcu_dereference(mdev->tconn->net_conf); | |
2941 | ||
2942 | if (hg == 100 || (hg == -100 && nc->always_asbp)) { | |
b411b363 PR |
2943 | int pcount = (mdev->state.role == R_PRIMARY) |
2944 | + (peer_role == R_PRIMARY); | |
2945 | int forced = (hg == -100); | |
2946 | ||
2947 | switch (pcount) { | |
2948 | case 0: | |
2949 | hg = drbd_asb_recover_0p(mdev); | |
2950 | break; | |
2951 | case 1: | |
2952 | hg = drbd_asb_recover_1p(mdev); | |
2953 | break; | |
2954 | case 2: | |
2955 | hg = drbd_asb_recover_2p(mdev); | |
2956 | break; | |
2957 | } | |
2958 | if (abs(hg) < 100) { | |
2959 | dev_warn(DEV, "Split-Brain detected, %d primaries, " | |
2960 | "automatically solved. Sync from %s node\n", | |
2961 | pcount, (hg < 0) ? "peer" : "this"); | |
2962 | if (forced) { | |
2963 | dev_warn(DEV, "Doing a full sync, since" | |
2964 | " UUIDs where ambiguous.\n"); | |
2965 | hg = hg*2; | |
2966 | } | |
2967 | } | |
2968 | } | |
2969 | ||
2970 | if (hg == -100) { | |
08b165ba | 2971 | if (test_bit(DISCARD_MY_DATA, &mdev->flags) && !(mdev->p_uuid[UI_FLAGS]&1)) |
b411b363 | 2972 | hg = -1; |
08b165ba | 2973 | if (!test_bit(DISCARD_MY_DATA, &mdev->flags) && (mdev->p_uuid[UI_FLAGS]&1)) |
b411b363 PR |
2974 | hg = 1; |
2975 | ||
2976 | if (abs(hg) < 100) | |
2977 | dev_warn(DEV, "Split-Brain detected, manually solved. " | |
2978 | "Sync from %s node\n", | |
2979 | (hg < 0) ? "peer" : "this"); | |
2980 | } | |
44ed167d | 2981 | rr_conflict = nc->rr_conflict; |
6dff2902 | 2982 | tentative = nc->tentative; |
44ed167d | 2983 | rcu_read_unlock(); |
b411b363 PR |
2984 | |
2985 | if (hg == -100) { | |
580b9767 LE |
2986 | /* FIXME this log message is not correct if we end up here |
2987 | * after an attempted attach on a diskless node. | |
2988 | * We just refuse to attach -- well, we drop the "connection" | |
2989 | * to that disk, in a way... */ | |
3a11a487 | 2990 | dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n"); |
b411b363 PR |
2991 | drbd_khelper(mdev, "split-brain"); |
2992 | return C_MASK; | |
2993 | } | |
2994 | ||
2995 | if (hg > 0 && mydisk <= D_INCONSISTENT) { | |
2996 | dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n"); | |
2997 | return C_MASK; | |
2998 | } | |
2999 | ||
3000 | if (hg < 0 && /* by intention we do not use mydisk here. */ | |
3001 | mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) { | |
44ed167d | 3002 | switch (rr_conflict) { |
b411b363 PR |
3003 | case ASB_CALL_HELPER: |
3004 | drbd_khelper(mdev, "pri-lost"); | |
3005 | /* fall through */ | |
3006 | case ASB_DISCONNECT: | |
3007 | dev_err(DEV, "I shall become SyncTarget, but I am primary!\n"); | |
3008 | return C_MASK; | |
3009 | case ASB_VIOLENTLY: | |
3010 | dev_warn(DEV, "Becoming SyncTarget, violating the stable-data" | |
3011 | "assumption\n"); | |
3012 | } | |
3013 | } | |
3014 | ||
6dff2902 | 3015 | if (tentative || test_bit(CONN_DRY_RUN, &mdev->tconn->flags)) { |
cf14c2e9 PR |
3016 | if (hg == 0) |
3017 | dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n"); | |
3018 | else | |
3019 | dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.", | |
3020 | drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), | |
3021 | abs(hg) >= 2 ? "full" : "bit-map based"); | |
3022 | return C_MASK; | |
3023 | } | |
3024 | ||
b411b363 PR |
3025 | if (abs(hg) >= 2) { |
3026 | dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); | |
20ceb2b2 LE |
3027 | if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake", |
3028 | BM_LOCKED_SET_ALLOWED)) | |
b411b363 PR |
3029 | return C_MASK; |
3030 | } | |
3031 | ||
3032 | if (hg > 0) { /* become sync source. */ | |
3033 | rv = C_WF_BITMAP_S; | |
3034 | } else if (hg < 0) { /* become sync target */ | |
3035 | rv = C_WF_BITMAP_T; | |
3036 | } else { | |
3037 | rv = C_CONNECTED; | |
3038 | if (drbd_bm_total_weight(mdev)) { | |
3039 | dev_info(DEV, "No resync, but %lu bits in bitmap!\n", | |
3040 | drbd_bm_total_weight(mdev)); | |
3041 | } | |
3042 | } | |
3043 | ||
3044 | return rv; | |
3045 | } | |
3046 | ||
f179d76d | 3047 | static enum drbd_after_sb_p convert_after_sb(enum drbd_after_sb_p peer) |
b411b363 PR |
3048 | { |
3049 | /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ | |
f179d76d PR |
3050 | if (peer == ASB_DISCARD_REMOTE) |
3051 | return ASB_DISCARD_LOCAL; | |
b411b363 PR |
3052 | |
3053 | /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ | |
f179d76d PR |
3054 | if (peer == ASB_DISCARD_LOCAL) |
3055 | return ASB_DISCARD_REMOTE; | |
b411b363 PR |
3056 | |
3057 | /* everything else is valid if they are equal on both sides. */ | |
f179d76d | 3058 | return peer; |
b411b363 PR |
3059 | } |
3060 | ||
e2857216 | 3061 | static int receive_protocol(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 3062 | { |
e658983a | 3063 | struct p_protocol *p = pi->data; |
036b17ea PR |
3064 | enum drbd_after_sb_p p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; |
3065 | int p_proto, p_discard_my_data, p_two_primaries, cf; | |
3066 | struct net_conf *nc, *old_net_conf, *new_net_conf = NULL; | |
3067 | char integrity_alg[SHARED_SECRET_MAX] = ""; | |
accdbcc5 | 3068 | struct crypto_hash *peer_integrity_tfm = NULL; |
7aca6c75 | 3069 | void *int_dig_in = NULL, *int_dig_vv = NULL; |
b411b363 | 3070 | |
b411b363 PR |
3071 | p_proto = be32_to_cpu(p->protocol); |
3072 | p_after_sb_0p = be32_to_cpu(p->after_sb_0p); | |
3073 | p_after_sb_1p = be32_to_cpu(p->after_sb_1p); | |
3074 | p_after_sb_2p = be32_to_cpu(p->after_sb_2p); | |
b411b363 | 3075 | p_two_primaries = be32_to_cpu(p->two_primaries); |
cf14c2e9 | 3076 | cf = be32_to_cpu(p->conn_flags); |
6139f60d | 3077 | p_discard_my_data = cf & CF_DISCARD_MY_DATA; |
cf14c2e9 | 3078 | |
86db0618 AG |
3079 | if (tconn->agreed_pro_version >= 87) { |
3080 | int err; | |
3081 | ||
88104ca4 | 3082 | if (pi->size > sizeof(integrity_alg)) |
86db0618 | 3083 | return -EIO; |
88104ca4 | 3084 | err = drbd_recv_all(tconn, integrity_alg, pi->size); |
86db0618 AG |
3085 | if (err) |
3086 | return err; | |
036b17ea PR |
3087 | integrity_alg[SHARED_SECRET_MAX - 1] = 0; |
3088 | } | |
88104ca4 | 3089 | |
7d4c782c | 3090 | if (pi->cmd != P_PROTOCOL_UPDATE) { |
fbc12f45 | 3091 | clear_bit(CONN_DRY_RUN, &tconn->flags); |
036b17ea | 3092 | |
fbc12f45 AG |
3093 | if (cf & CF_DRY_RUN) |
3094 | set_bit(CONN_DRY_RUN, &tconn->flags); | |
cf14c2e9 | 3095 | |
fbc12f45 AG |
3096 | rcu_read_lock(); |
3097 | nc = rcu_dereference(tconn->net_conf); | |
b411b363 | 3098 | |
fbc12f45 | 3099 | if (p_proto != nc->wire_protocol) { |
d505d9be | 3100 | conn_err(tconn, "incompatible %s settings\n", "protocol"); |
fbc12f45 AG |
3101 | goto disconnect_rcu_unlock; |
3102 | } | |
44ed167d | 3103 | |
fbc12f45 | 3104 | if (convert_after_sb(p_after_sb_0p) != nc->after_sb_0p) { |
d505d9be | 3105 | conn_err(tconn, "incompatible %s settings\n", "after-sb-0pri"); |
fbc12f45 AG |
3106 | goto disconnect_rcu_unlock; |
3107 | } | |
b411b363 | 3108 | |
fbc12f45 | 3109 | if (convert_after_sb(p_after_sb_1p) != nc->after_sb_1p) { |
d505d9be | 3110 | conn_err(tconn, "incompatible %s settings\n", "after-sb-1pri"); |
fbc12f45 AG |
3111 | goto disconnect_rcu_unlock; |
3112 | } | |
b411b363 | 3113 | |
fbc12f45 | 3114 | if (convert_after_sb(p_after_sb_2p) != nc->after_sb_2p) { |
d505d9be | 3115 | conn_err(tconn, "incompatible %s settings\n", "after-sb-2pri"); |
fbc12f45 AG |
3116 | goto disconnect_rcu_unlock; |
3117 | } | |
b411b363 | 3118 | |
fbc12f45 | 3119 | if (p_discard_my_data && nc->discard_my_data) { |
d505d9be | 3120 | conn_err(tconn, "incompatible %s settings\n", "discard-my-data"); |
fbc12f45 AG |
3121 | goto disconnect_rcu_unlock; |
3122 | } | |
b411b363 | 3123 | |
fbc12f45 | 3124 | if (p_two_primaries != nc->two_primaries) { |
d505d9be | 3125 | conn_err(tconn, "incompatible %s settings\n", "allow-two-primaries"); |
fbc12f45 AG |
3126 | goto disconnect_rcu_unlock; |
3127 | } | |
b411b363 | 3128 | |
fbc12f45 | 3129 | if (strcmp(integrity_alg, nc->integrity_alg)) { |
d505d9be | 3130 | conn_err(tconn, "incompatible %s settings\n", "data-integrity-alg"); |
fbc12f45 AG |
3131 | goto disconnect_rcu_unlock; |
3132 | } | |
b411b363 | 3133 | |
fbc12f45 | 3134 | rcu_read_unlock(); |
036b17ea | 3135 | } |
7d4c782c AG |
3136 | |
3137 | if (integrity_alg[0]) { | |
3138 | int hash_size; | |
3139 | ||
3140 | /* | |
3141 | * We can only change the peer data integrity algorithm | |
3142 | * here. Changing our own data integrity algorithm | |
3143 | * requires that we send a P_PROTOCOL_UPDATE packet at | |
3144 | * the same time; otherwise, the peer has no way to | |
3145 | * tell between which packets the algorithm should | |
3146 | * change. | |
3147 | */ | |
3148 | ||
3149 | peer_integrity_tfm = crypto_alloc_hash(integrity_alg, 0, CRYPTO_ALG_ASYNC); | |
3150 | if (!peer_integrity_tfm) { | |
3151 | conn_err(tconn, "peer data-integrity-alg %s not supported\n", | |
3152 | integrity_alg); | |
3153 | goto disconnect; | |
3154 | } | |
3155 | ||
3156 | hash_size = crypto_hash_digestsize(peer_integrity_tfm); | |
3157 | int_dig_in = kmalloc(hash_size, GFP_KERNEL); | |
3158 | int_dig_vv = kmalloc(hash_size, GFP_KERNEL); | |
3159 | if (!(int_dig_in && int_dig_vv)) { | |
3160 | conn_err(tconn, "Allocation of buffers for data integrity checking failed\n"); | |
3161 | goto disconnect; | |
3162 | } | |
3163 | } | |
3164 | ||
3165 | new_net_conf = kmalloc(sizeof(struct net_conf), GFP_KERNEL); | |
3166 | if (!new_net_conf) { | |
3167 | conn_err(tconn, "Allocation of new net_conf failed\n"); | |
3168 | goto disconnect; | |
3169 | } | |
3170 | ||
3171 | mutex_lock(&tconn->data.mutex); | |
3172 | mutex_lock(&tconn->conf_update); | |
3173 | old_net_conf = tconn->net_conf; | |
3174 | *new_net_conf = *old_net_conf; | |
3175 | ||
3176 | new_net_conf->wire_protocol = p_proto; | |
3177 | new_net_conf->after_sb_0p = convert_after_sb(p_after_sb_0p); | |
3178 | new_net_conf->after_sb_1p = convert_after_sb(p_after_sb_1p); | |
3179 | new_net_conf->after_sb_2p = convert_after_sb(p_after_sb_2p); | |
3180 | new_net_conf->two_primaries = p_two_primaries; | |
3181 | ||
3182 | rcu_assign_pointer(tconn->net_conf, new_net_conf); | |
3183 | mutex_unlock(&tconn->conf_update); | |
3184 | mutex_unlock(&tconn->data.mutex); | |
3185 | ||
3186 | crypto_free_hash(tconn->peer_integrity_tfm); | |
3187 | kfree(tconn->int_dig_in); | |
3188 | kfree(tconn->int_dig_vv); | |
3189 | tconn->peer_integrity_tfm = peer_integrity_tfm; | |
3190 | tconn->int_dig_in = int_dig_in; | |
3191 | tconn->int_dig_vv = int_dig_vv; | |
3192 | ||
3193 | if (strcmp(old_net_conf->integrity_alg, integrity_alg)) | |
3194 | conn_info(tconn, "peer data-integrity-alg: %s\n", | |
3195 | integrity_alg[0] ? integrity_alg : "(none)"); | |
3196 | ||
3197 | synchronize_rcu(); | |
3198 | kfree(old_net_conf); | |
82bc0194 | 3199 | return 0; |
b411b363 | 3200 | |
44ed167d PR |
3201 | disconnect_rcu_unlock: |
3202 | rcu_read_unlock(); | |
b411b363 | 3203 | disconnect: |
b792c35c | 3204 | crypto_free_hash(peer_integrity_tfm); |
036b17ea PR |
3205 | kfree(int_dig_in); |
3206 | kfree(int_dig_vv); | |
7204624c | 3207 | conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 3208 | return -EIO; |
b411b363 PR |
3209 | } |
3210 | ||
3211 | /* helper function | |
3212 | * input: alg name, feature name | |
3213 | * return: NULL (alg name was "") | |
3214 | * ERR_PTR(error) if something goes wrong | |
3215 | * or the crypto hash ptr, if it worked out ok. */ | |
3216 | struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev, | |
3217 | const char *alg, const char *name) | |
3218 | { | |
3219 | struct crypto_hash *tfm; | |
3220 | ||
3221 | if (!alg[0]) | |
3222 | return NULL; | |
3223 | ||
3224 | tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC); | |
3225 | if (IS_ERR(tfm)) { | |
3226 | dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n", | |
3227 | alg, name, PTR_ERR(tfm)); | |
3228 | return tfm; | |
3229 | } | |
b411b363 PR |
3230 | return tfm; |
3231 | } | |
3232 | ||
4a76b161 AG |
3233 | static int ignore_remaining_packet(struct drbd_tconn *tconn, struct packet_info *pi) |
3234 | { | |
3235 | void *buffer = tconn->data.rbuf; | |
3236 | int size = pi->size; | |
3237 | ||
3238 | while (size) { | |
3239 | int s = min_t(int, size, DRBD_SOCKET_BUFFER_SIZE); | |
3240 | s = drbd_recv(tconn, buffer, s); | |
3241 | if (s <= 0) { | |
3242 | if (s < 0) | |
3243 | return s; | |
3244 | break; | |
3245 | } | |
3246 | size -= s; | |
3247 | } | |
3248 | if (size) | |
3249 | return -EIO; | |
3250 | return 0; | |
3251 | } | |
3252 | ||
3253 | /* | |
3254 | * config_unknown_volume - device configuration command for unknown volume | |
3255 | * | |
3256 | * When a device is added to an existing connection, the node on which the | |
3257 | * device is added first will send configuration commands to its peer but the | |
3258 | * peer will not know about the device yet. It will warn and ignore these | |
3259 | * commands. Once the device is added on the second node, the second node will | |
3260 | * send the same device configuration commands, but in the other direction. | |
3261 | * | |
3262 | * (We can also end up here if drbd is misconfigured.) | |
3263 | */ | |
3264 | static int config_unknown_volume(struct drbd_tconn *tconn, struct packet_info *pi) | |
3265 | { | |
2fcb8f30 AG |
3266 | conn_warn(tconn, "%s packet received for volume %u, which is not configured locally\n", |
3267 | cmdname(pi->cmd), pi->vnr); | |
4a76b161 AG |
3268 | return ignore_remaining_packet(tconn, pi); |
3269 | } | |
3270 | ||
3271 | static int receive_SyncParam(struct drbd_tconn *tconn, struct packet_info *pi) | |
b411b363 | 3272 | { |
4a76b161 | 3273 | struct drbd_conf *mdev; |
e658983a | 3274 | struct p_rs_param_95 *p; |
b411b363 PR |
3275 | unsigned int header_size, data_size, exp_max_sz; |
3276 | struct crypto_hash *verify_tfm = NULL; | |
3277 | struct crypto_hash *csums_tfm = NULL; | |
2ec91e0e | 3278 | struct net_conf *old_net_conf, *new_net_conf = NULL; |
813472ce | 3279 | struct disk_conf *old_disk_conf = NULL, *new_disk_conf = NULL; |
4a76b161 | 3280 | const int apv = tconn->agreed_pro_version; |
813472ce | 3281 | struct fifo_buffer *old_plan = NULL, *new_plan = NULL; |
778f271d | 3282 | int fifo_size = 0; |
82bc0194 | 3283 | int err; |
b411b363 | 3284 | |
4a76b161 AG |
3285 | mdev = vnr_to_mdev(tconn, pi->vnr); |
3286 | if (!mdev) | |
3287 | return config_unknown_volume(tconn, pi); | |
3288 | ||
b411b363 PR |
3289 | exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) |
3290 | : apv == 88 ? sizeof(struct p_rs_param) | |
3291 | + SHARED_SECRET_MAX | |
8e26f9cc PR |
3292 | : apv <= 94 ? sizeof(struct p_rs_param_89) |
3293 | : /* apv >= 95 */ sizeof(struct p_rs_param_95); | |
b411b363 | 3294 | |
e2857216 | 3295 | if (pi->size > exp_max_sz) { |
b411b363 | 3296 | dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n", |
e2857216 | 3297 | pi->size, exp_max_sz); |
82bc0194 | 3298 | return -EIO; |
b411b363 PR |
3299 | } |
3300 | ||
3301 | if (apv <= 88) { | |
e658983a | 3302 | header_size = sizeof(struct p_rs_param); |
e2857216 | 3303 | data_size = pi->size - header_size; |
8e26f9cc | 3304 | } else if (apv <= 94) { |
e658983a | 3305 | header_size = sizeof(struct p_rs_param_89); |
e2857216 | 3306 | data_size = pi->size - header_size; |
b411b363 | 3307 | D_ASSERT(data_size == 0); |
8e26f9cc | 3308 | } else { |
e658983a | 3309 | header_size = sizeof(struct p_rs_param_95); |
e2857216 | 3310 | data_size = pi->size - header_size; |
b411b363 PR |
3311 | D_ASSERT(data_size == 0); |
3312 | } | |
3313 | ||
3314 | /* initialize verify_alg and csums_alg */ | |
e658983a | 3315 | p = pi->data; |
b411b363 PR |
3316 | memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); |
3317 | ||
e658983a | 3318 | err = drbd_recv_all(mdev->tconn, p, header_size); |
82bc0194 AG |
3319 | if (err) |
3320 | return err; | |
b411b363 | 3321 | |
daeda1cc PR |
3322 | mutex_lock(&mdev->tconn->conf_update); |
3323 | old_net_conf = mdev->tconn->net_conf; | |
813472ce PR |
3324 | if (get_ldev(mdev)) { |
3325 | new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); | |
3326 | if (!new_disk_conf) { | |
3327 | put_ldev(mdev); | |
3328 | mutex_unlock(&mdev->tconn->conf_update); | |
3329 | dev_err(DEV, "Allocation of new disk_conf failed\n"); | |
3330 | return -ENOMEM; | |
3331 | } | |
daeda1cc | 3332 | |
813472ce PR |
3333 | old_disk_conf = mdev->ldev->disk_conf; |
3334 | *new_disk_conf = *old_disk_conf; | |
3335 | ||
6394b935 | 3336 | new_disk_conf->resync_rate = be32_to_cpu(p->resync_rate); |
813472ce | 3337 | } |
daeda1cc | 3338 | |
b411b363 PR |
3339 | if (apv >= 88) { |
3340 | if (apv == 88) { | |
3341 | if (data_size > SHARED_SECRET_MAX) { | |
3342 | dev_err(DEV, "verify-alg too long, " | |
3343 | "peer wants %u, accepting only %u byte\n", | |
3344 | data_size, SHARED_SECRET_MAX); | |
813472ce PR |
3345 | err = -EIO; |
3346 | goto reconnect; | |
b411b363 PR |
3347 | } |
3348 | ||
82bc0194 | 3349 | err = drbd_recv_all(mdev->tconn, p->verify_alg, data_size); |
813472ce PR |
3350 | if (err) |
3351 | goto reconnect; | |
b411b363 PR |
3352 | /* we expect NUL terminated string */ |
3353 | /* but just in case someone tries to be evil */ | |
3354 | D_ASSERT(p->verify_alg[data_size-1] == 0); | |
3355 | p->verify_alg[data_size-1] = 0; | |
3356 | ||
3357 | } else /* apv >= 89 */ { | |
3358 | /* we still expect NUL terminated strings */ | |
3359 | /* but just in case someone tries to be evil */ | |
3360 | D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0); | |
3361 | D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0); | |
3362 | p->verify_alg[SHARED_SECRET_MAX-1] = 0; | |
3363 | p->csums_alg[SHARED_SECRET_MAX-1] = 0; | |
3364 | } | |
3365 | ||
2ec91e0e | 3366 | if (strcmp(old_net_conf->verify_alg, p->verify_alg)) { |
b411b363 PR |
3367 | if (mdev->state.conn == C_WF_REPORT_PARAMS) { |
3368 | dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", | |
2ec91e0e | 3369 | old_net_conf->verify_alg, p->verify_alg); |
b411b363 PR |
3370 | goto disconnect; |
3371 | } | |
3372 | verify_tfm = drbd_crypto_alloc_digest_safe(mdev, | |
3373 | p->verify_alg, "verify-alg"); | |
3374 | if (IS_ERR(verify_tfm)) { | |
3375 | verify_tfm = NULL; | |
3376 | goto disconnect; | |
3377 | } | |
3378 | } | |
3379 | ||
2ec91e0e | 3380 | if (apv >= 89 && strcmp(old_net_conf->csums_alg, p->csums_alg)) { |
b411b363 PR |
3381 | if (mdev->state.conn == C_WF_REPORT_PARAMS) { |
3382 | dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", | |
2ec91e0e | 3383 | old_net_conf->csums_alg, p->csums_alg); |
b411b363 PR |
3384 | goto disconnect; |
3385 | } | |
3386 | csums_tfm = drbd_crypto_alloc_digest_safe(mdev, | |
3387 | p->csums_alg, "csums-alg"); | |
3388 | if (IS_ERR(csums_tfm)) { | |
3389 | csums_tfm = NULL; | |
3390 | goto disconnect; | |
3391 | } | |
3392 | } | |
3393 | ||
813472ce | 3394 | if (apv > 94 && new_disk_conf) { |
daeda1cc PR |
3395 | new_disk_conf->c_plan_ahead = be32_to_cpu(p->c_plan_ahead); |
3396 | new_disk_conf->c_delay_target = be32_to_cpu(p->c_delay_target); | |
3397 | new_disk_conf->c_fill_target = be32_to_cpu(p->c_fill_target); | |
3398 | new_disk_conf->c_max_rate = be32_to_cpu(p->c_max_rate); | |
778f271d | 3399 | |
daeda1cc | 3400 | fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ; |
9958c857 | 3401 | if (fifo_size != mdev->rs_plan_s->size) { |
813472ce PR |
3402 | new_plan = fifo_alloc(fifo_size); |
3403 | if (!new_plan) { | |
778f271d | 3404 | dev_err(DEV, "kmalloc of fifo_buffer failed"); |
f399002e | 3405 | put_ldev(mdev); |
778f271d PR |
3406 | goto disconnect; |
3407 | } | |
3408 | } | |
8e26f9cc | 3409 | } |
b411b363 | 3410 | |
91fd4dad | 3411 | if (verify_tfm || csums_tfm) { |
2ec91e0e PR |
3412 | new_net_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL); |
3413 | if (!new_net_conf) { | |
91fd4dad PR |
3414 | dev_err(DEV, "Allocation of new net_conf failed\n"); |
3415 | goto disconnect; | |
3416 | } | |
3417 | ||
2ec91e0e | 3418 | *new_net_conf = *old_net_conf; |
91fd4dad PR |
3419 | |
3420 | if (verify_tfm) { | |
2ec91e0e PR |
3421 | strcpy(new_net_conf->verify_alg, p->verify_alg); |
3422 | new_net_conf->verify_alg_len = strlen(p->verify_alg) + 1; | |
91fd4dad PR |
3423 | crypto_free_hash(mdev->tconn->verify_tfm); |
3424 | mdev->tconn->verify_tfm = verify_tfm; | |
3425 | dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg); | |
3426 | } | |
3427 | if (csums_tfm) { | |
2ec91e0e PR |
3428 | strcpy(new_net_conf->csums_alg, p->csums_alg); |
3429 | new_net_conf->csums_alg_len = strlen(p->csums_alg) + 1; | |
91fd4dad PR |
3430 | crypto_free_hash(mdev->tconn->csums_tfm); |
3431 | mdev->tconn->csums_tfm = csums_tfm; | |
3432 | dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg); | |
3433 | } | |
2ec91e0e | 3434 | rcu_assign_pointer(tconn->net_conf, new_net_conf); |
b411b363 | 3435 | } |
daeda1cc | 3436 | } |
91fd4dad | 3437 | |
813472ce PR |
3438 | if (new_disk_conf) { |
3439 | rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf); | |
3440 | put_ldev(mdev); | |
3441 | } | |
3442 | ||
3443 | if (new_plan) { | |
3444 | old_plan = mdev->rs_plan_s; | |
3445 | rcu_assign_pointer(mdev->rs_plan_s, new_plan); | |
b411b363 | 3446 | } |
daeda1cc PR |
3447 | |
3448 | mutex_unlock(&mdev->tconn->conf_update); | |
3449 | synchronize_rcu(); | |
3450 | if (new_net_conf) | |
3451 | kfree(old_net_conf); | |
3452 | kfree(old_disk_conf); | |
813472ce | 3453 | kfree(old_plan); |
daeda1cc | 3454 | |
82bc0194 | 3455 | return 0; |
b411b363 | 3456 | |
813472ce PR |
3457 | reconnect: |
3458 | if (new_disk_conf) { | |
3459 | put_ldev(mdev); | |
3460 | kfree(new_disk_conf); | |
3461 | } | |
3462 | mutex_unlock(&mdev->tconn->conf_update); | |
3463 | return -EIO; | |
3464 | ||
b411b363 | 3465 | disconnect: |
813472ce PR |
3466 | kfree(new_plan); |
3467 | if (new_disk_conf) { | |
3468 | put_ldev(mdev); | |
3469 | kfree(new_disk_conf); | |
3470 | } | |
a0095508 | 3471 | mutex_unlock(&mdev->tconn->conf_update); |
b411b363 PR |
3472 | /* just for completeness: actually not needed, |
3473 | * as this is not reached if csums_tfm was ok. */ | |
3474 | crypto_free_hash(csums_tfm); | |
3475 | /* but free the verify_tfm again, if csums_tfm did not work out */ | |
3476 | crypto_free_hash(verify_tfm); | |
38fa9988 | 3477 | conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 3478 | return -EIO; |
b411b363 PR |
3479 | } |
3480 | ||
b411b363 PR |
3481 | /* warn if the arguments differ by more than 12.5% */ |
3482 | static void warn_if_differ_considerably(struct drbd_conf *mdev, | |
3483 | const char *s, sector_t a, sector_t b) | |
3484 | { | |
3485 | sector_t d; | |
3486 | if (a == 0 || b == 0) | |
3487 | return; | |
3488 | d = (a > b) ? (a - b) : (b - a); | |
3489 | if (d > (a>>3) || d > (b>>3)) | |
3490 | dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s, | |
3491 | (unsigned long long)a, (unsigned long long)b); | |
3492 | } | |
3493 | ||
4a76b161 | 3494 | static int receive_sizes(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 3495 | { |
4a76b161 | 3496 | struct drbd_conf *mdev; |
e658983a | 3497 | struct p_sizes *p = pi->data; |
b411b363 | 3498 | enum determine_dev_size dd = unchanged; |
b411b363 PR |
3499 | sector_t p_size, p_usize, my_usize; |
3500 | int ldsc = 0; /* local disk size changed */ | |
e89b591c | 3501 | enum dds_flags ddsf; |
b411b363 | 3502 | |
4a76b161 AG |
3503 | mdev = vnr_to_mdev(tconn, pi->vnr); |
3504 | if (!mdev) | |
3505 | return config_unknown_volume(tconn, pi); | |
3506 | ||
b411b363 PR |
3507 | p_size = be64_to_cpu(p->d_size); |
3508 | p_usize = be64_to_cpu(p->u_size); | |
3509 | ||
b411b363 PR |
3510 | /* just store the peer's disk size for now. |
3511 | * we still need to figure out whether we accept that. */ | |
3512 | mdev->p_size = p_size; | |
3513 | ||
b411b363 | 3514 | if (get_ldev(mdev)) { |
daeda1cc PR |
3515 | rcu_read_lock(); |
3516 | my_usize = rcu_dereference(mdev->ldev->disk_conf)->disk_size; | |
3517 | rcu_read_unlock(); | |
3518 | ||
b411b363 PR |
3519 | warn_if_differ_considerably(mdev, "lower level device sizes", |
3520 | p_size, drbd_get_max_capacity(mdev->ldev)); | |
3521 | warn_if_differ_considerably(mdev, "user requested size", | |
daeda1cc | 3522 | p_usize, my_usize); |
b411b363 PR |
3523 | |
3524 | /* if this is the first connect, or an otherwise expected | |
3525 | * param exchange, choose the minimum */ | |
3526 | if (mdev->state.conn == C_WF_REPORT_PARAMS) | |
daeda1cc | 3527 | p_usize = min_not_zero(my_usize, p_usize); |
b411b363 PR |
3528 | |
3529 | /* Never shrink a device with usable data during connect. | |
3530 | But allow online shrinking if we are connected. */ | |
ef5e44a6 | 3531 | if (drbd_new_dev_size(mdev, mdev->ldev, p_usize, 0) < |
daeda1cc PR |
3532 | drbd_get_capacity(mdev->this_bdev) && |
3533 | mdev->state.disk >= D_OUTDATED && | |
3534 | mdev->state.conn < C_CONNECTED) { | |
b411b363 | 3535 | dev_err(DEV, "The peer's disk size is too small!\n"); |
38fa9988 | 3536 | conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 | 3537 | put_ldev(mdev); |
82bc0194 | 3538 | return -EIO; |
b411b363 | 3539 | } |
daeda1cc PR |
3540 | |
3541 | if (my_usize != p_usize) { | |
3542 | struct disk_conf *old_disk_conf, *new_disk_conf = NULL; | |
3543 | ||
3544 | new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); | |
3545 | if (!new_disk_conf) { | |
3546 | dev_err(DEV, "Allocation of new disk_conf failed\n"); | |
3547 | put_ldev(mdev); | |
3548 | return -ENOMEM; | |
3549 | } | |
3550 | ||
3551 | mutex_lock(&mdev->tconn->conf_update); | |
3552 | old_disk_conf = mdev->ldev->disk_conf; | |
3553 | *new_disk_conf = *old_disk_conf; | |
3554 | new_disk_conf->disk_size = p_usize; | |
3555 | ||
3556 | rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf); | |
3557 | mutex_unlock(&mdev->tconn->conf_update); | |
3558 | synchronize_rcu(); | |
3559 | kfree(old_disk_conf); | |
3560 | ||
3561 | dev_info(DEV, "Peer sets u_size to %lu sectors\n", | |
3562 | (unsigned long)my_usize); | |
3563 | } | |
3564 | ||
b411b363 PR |
3565 | put_ldev(mdev); |
3566 | } | |
b411b363 | 3567 | |
e89b591c | 3568 | ddsf = be16_to_cpu(p->dds_flags); |
b411b363 | 3569 | if (get_ldev(mdev)) { |
24c4830c | 3570 | dd = drbd_determine_dev_size(mdev, ddsf); |
b411b363 PR |
3571 | put_ldev(mdev); |
3572 | if (dd == dev_size_error) | |
82bc0194 | 3573 | return -EIO; |
b411b363 PR |
3574 | drbd_md_sync(mdev); |
3575 | } else { | |
3576 | /* I am diskless, need to accept the peer's size. */ | |
3577 | drbd_set_my_capacity(mdev, p_size); | |
3578 | } | |
3579 | ||
99432fcc PR |
3580 | mdev->peer_max_bio_size = be32_to_cpu(p->max_bio_size); |
3581 | drbd_reconsider_max_bio_size(mdev); | |
3582 | ||
b411b363 PR |
3583 | if (get_ldev(mdev)) { |
3584 | if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { | |
3585 | mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); | |
3586 | ldsc = 1; | |
3587 | } | |
3588 | ||
b411b363 PR |
3589 | put_ldev(mdev); |
3590 | } | |
3591 | ||
3592 | if (mdev->state.conn > C_WF_REPORT_PARAMS) { | |
3593 | if (be64_to_cpu(p->c_size) != | |
3594 | drbd_get_capacity(mdev->this_bdev) || ldsc) { | |
3595 | /* we have different sizes, probably peer | |
3596 | * needs to know my new size... */ | |
e89b591c | 3597 | drbd_send_sizes(mdev, 0, ddsf); |
b411b363 PR |
3598 | } |
3599 | if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) || | |
3600 | (dd == grew && mdev->state.conn == C_CONNECTED)) { | |
3601 | if (mdev->state.pdsk >= D_INCONSISTENT && | |
e89b591c PR |
3602 | mdev->state.disk >= D_INCONSISTENT) { |
3603 | if (ddsf & DDSF_NO_RESYNC) | |
3604 | dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n"); | |
3605 | else | |
3606 | resync_after_online_grow(mdev); | |
3607 | } else | |
b411b363 PR |
3608 | set_bit(RESYNC_AFTER_NEG, &mdev->flags); |
3609 | } | |
3610 | } | |
3611 | ||
82bc0194 | 3612 | return 0; |
b411b363 PR |
3613 | } |
3614 | ||
4a76b161 | 3615 | static int receive_uuids(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 3616 | { |
4a76b161 | 3617 | struct drbd_conf *mdev; |
e658983a | 3618 | struct p_uuids *p = pi->data; |
b411b363 | 3619 | u64 *p_uuid; |
62b0da3a | 3620 | int i, updated_uuids = 0; |
b411b363 | 3621 | |
4a76b161 AG |
3622 | mdev = vnr_to_mdev(tconn, pi->vnr); |
3623 | if (!mdev) | |
3624 | return config_unknown_volume(tconn, pi); | |
3625 | ||
b411b363 PR |
3626 | p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); |
3627 | ||
3628 | for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) | |
3629 | p_uuid[i] = be64_to_cpu(p->uuid[i]); | |
3630 | ||
3631 | kfree(mdev->p_uuid); | |
3632 | mdev->p_uuid = p_uuid; | |
3633 | ||
3634 | if (mdev->state.conn < C_CONNECTED && | |
3635 | mdev->state.disk < D_INCONSISTENT && | |
3636 | mdev->state.role == R_PRIMARY && | |
3637 | (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { | |
3638 | dev_err(DEV, "Can only connect to data with current UUID=%016llX\n", | |
3639 | (unsigned long long)mdev->ed_uuid); | |
38fa9988 | 3640 | conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 3641 | return -EIO; |
b411b363 PR |
3642 | } |
3643 | ||
3644 | if (get_ldev(mdev)) { | |
3645 | int skip_initial_sync = | |
3646 | mdev->state.conn == C_CONNECTED && | |
31890f4a | 3647 | mdev->tconn->agreed_pro_version >= 90 && |
b411b363 PR |
3648 | mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && |
3649 | (p_uuid[UI_FLAGS] & 8); | |
3650 | if (skip_initial_sync) { | |
3651 | dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n"); | |
3652 | drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, | |
20ceb2b2 LE |
3653 | "clear_n_write from receive_uuids", |
3654 | BM_LOCKED_TEST_ALLOWED); | |
b411b363 PR |
3655 | _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]); |
3656 | _drbd_uuid_set(mdev, UI_BITMAP, 0); | |
3657 | _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), | |
3658 | CS_VERBOSE, NULL); | |
3659 | drbd_md_sync(mdev); | |
62b0da3a | 3660 | updated_uuids = 1; |
b411b363 PR |
3661 | } |
3662 | put_ldev(mdev); | |
18a50fa2 PR |
3663 | } else if (mdev->state.disk < D_INCONSISTENT && |
3664 | mdev->state.role == R_PRIMARY) { | |
3665 | /* I am a diskless primary, the peer just created a new current UUID | |
3666 | for me. */ | |
62b0da3a | 3667 | updated_uuids = drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); |
b411b363 PR |
3668 | } |
3669 | ||
3670 | /* Before we test for the disk state, we should wait until an eventually | |
3671 | ongoing cluster wide state change is finished. That is important if | |
3672 | we are primary and are detaching from our disk. We need to see the | |
3673 | new disk state... */ | |
8410da8f PR |
3674 | mutex_lock(mdev->state_mutex); |
3675 | mutex_unlock(mdev->state_mutex); | |
b411b363 | 3676 | if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT) |
62b0da3a LE |
3677 | updated_uuids |= drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); |
3678 | ||
3679 | if (updated_uuids) | |
3680 | drbd_print_uuids(mdev, "receiver updated UUIDs to"); | |
b411b363 | 3681 | |
82bc0194 | 3682 | return 0; |
b411b363 PR |
3683 | } |
3684 | ||
3685 | /** | |
3686 | * convert_state() - Converts the peer's view of the cluster state to our point of view | |
3687 | * @ps: The state as seen by the peer. | |
3688 | */ | |
3689 | static union drbd_state convert_state(union drbd_state ps) | |
3690 | { | |
3691 | union drbd_state ms; | |
3692 | ||
3693 | static enum drbd_conns c_tab[] = { | |
369bea63 | 3694 | [C_WF_REPORT_PARAMS] = C_WF_REPORT_PARAMS, |
b411b363 PR |
3695 | [C_CONNECTED] = C_CONNECTED, |
3696 | ||
3697 | [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, | |
3698 | [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, | |
3699 | [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ | |
3700 | [C_VERIFY_S] = C_VERIFY_T, | |
3701 | [C_MASK] = C_MASK, | |
3702 | }; | |
3703 | ||
3704 | ms.i = ps.i; | |
3705 | ||
3706 | ms.conn = c_tab[ps.conn]; | |
3707 | ms.peer = ps.role; | |
3708 | ms.role = ps.peer; | |
3709 | ms.pdsk = ps.disk; | |
3710 | ms.disk = ps.pdsk; | |
3711 | ms.peer_isp = (ps.aftr_isp | ps.user_isp); | |
3712 | ||
3713 | return ms; | |
3714 | } | |
3715 | ||
4a76b161 | 3716 | static int receive_req_state(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 3717 | { |
4a76b161 | 3718 | struct drbd_conf *mdev; |
e658983a | 3719 | struct p_req_state *p = pi->data; |
b411b363 | 3720 | union drbd_state mask, val; |
bf885f8a | 3721 | enum drbd_state_rv rv; |
b411b363 | 3722 | |
4a76b161 AG |
3723 | mdev = vnr_to_mdev(tconn, pi->vnr); |
3724 | if (!mdev) | |
3725 | return -EIO; | |
3726 | ||
b411b363 PR |
3727 | mask.i = be32_to_cpu(p->mask); |
3728 | val.i = be32_to_cpu(p->val); | |
3729 | ||
25703f83 | 3730 | if (test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) && |
8410da8f | 3731 | mutex_is_locked(mdev->state_mutex)) { |
b411b363 | 3732 | drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG); |
82bc0194 | 3733 | return 0; |
b411b363 PR |
3734 | } |
3735 | ||
3736 | mask = convert_state(mask); | |
3737 | val = convert_state(val); | |
3738 | ||
dfafcc8a PR |
3739 | rv = drbd_change_state(mdev, CS_VERBOSE, mask, val); |
3740 | drbd_send_sr_reply(mdev, rv); | |
b411b363 | 3741 | |
b411b363 PR |
3742 | drbd_md_sync(mdev); |
3743 | ||
82bc0194 | 3744 | return 0; |
b411b363 PR |
3745 | } |
3746 | ||
e2857216 | 3747 | static int receive_req_conn_state(struct drbd_tconn *tconn, struct packet_info *pi) |
dfafcc8a | 3748 | { |
e658983a | 3749 | struct p_req_state *p = pi->data; |
dfafcc8a PR |
3750 | union drbd_state mask, val; |
3751 | enum drbd_state_rv rv; | |
3752 | ||
3753 | mask.i = be32_to_cpu(p->mask); | |
3754 | val.i = be32_to_cpu(p->val); | |
3755 | ||
3756 | if (test_bit(DISCARD_CONCURRENT, &tconn->flags) && | |
3757 | mutex_is_locked(&tconn->cstate_mutex)) { | |
3758 | conn_send_sr_reply(tconn, SS_CONCURRENT_ST_CHG); | |
82bc0194 | 3759 | return 0; |
dfafcc8a PR |
3760 | } |
3761 | ||
3762 | mask = convert_state(mask); | |
3763 | val = convert_state(val); | |
3764 | ||
778bcf2e | 3765 | rv = conn_request_state(tconn, mask, val, CS_VERBOSE | CS_LOCAL_ONLY | CS_IGN_OUTD_FAIL); |
dfafcc8a PR |
3766 | conn_send_sr_reply(tconn, rv); |
3767 | ||
82bc0194 | 3768 | return 0; |
dfafcc8a PR |
3769 | } |
3770 | ||
4a76b161 | 3771 | static int receive_state(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 3772 | { |
4a76b161 | 3773 | struct drbd_conf *mdev; |
e658983a | 3774 | struct p_state *p = pi->data; |
4ac4aada | 3775 | union drbd_state os, ns, peer_state; |
b411b363 | 3776 | enum drbd_disk_state real_peer_disk; |
65d922c3 | 3777 | enum chg_state_flags cs_flags; |
b411b363 PR |
3778 | int rv; |
3779 | ||
4a76b161 AG |
3780 | mdev = vnr_to_mdev(tconn, pi->vnr); |
3781 | if (!mdev) | |
3782 | return config_unknown_volume(tconn, pi); | |
3783 | ||
b411b363 PR |
3784 | peer_state.i = be32_to_cpu(p->state); |
3785 | ||
3786 | real_peer_disk = peer_state.disk; | |
3787 | if (peer_state.disk == D_NEGOTIATING) { | |
3788 | real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; | |
3789 | dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); | |
3790 | } | |
3791 | ||
87eeee41 | 3792 | spin_lock_irq(&mdev->tconn->req_lock); |
b411b363 | 3793 | retry: |
78bae59b | 3794 | os = ns = drbd_read_state(mdev); |
87eeee41 | 3795 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 3796 | |
b8853dbd PR |
3797 | /* If some other part of the code (asender thread, timeout) |
3798 | * already decided to close the connection again, | |
3799 | * we must not "re-establish" it here. */ | |
3800 | if (os.conn <= C_TEAR_DOWN) | |
3801 | return false; | |
3802 | ||
9bcd2521 PR |
3803 | /* If this is the "end of sync" confirmation, usually the peer disk |
3804 | * transitions from D_INCONSISTENT to D_UP_TO_DATE. For empty (0 bits | |
3805 | * set) resync started in PausedSyncT, or if the timing of pause-/ | |
3806 | * unpause-sync events has been "just right", the peer disk may | |
3807 | * transition from D_CONSISTENT to D_UP_TO_DATE as well. | |
3808 | */ | |
3809 | if ((os.pdsk == D_INCONSISTENT || os.pdsk == D_CONSISTENT) && | |
3810 | real_peer_disk == D_UP_TO_DATE && | |
e9ef7bb6 LE |
3811 | os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { |
3812 | /* If we are (becoming) SyncSource, but peer is still in sync | |
3813 | * preparation, ignore its uptodate-ness to avoid flapping, it | |
3814 | * will change to inconsistent once the peer reaches active | |
3815 | * syncing states. | |
3816 | * It may have changed syncer-paused flags, however, so we | |
3817 | * cannot ignore this completely. */ | |
3818 | if (peer_state.conn > C_CONNECTED && | |
3819 | peer_state.conn < C_SYNC_SOURCE) | |
3820 | real_peer_disk = D_INCONSISTENT; | |
3821 | ||
3822 | /* if peer_state changes to connected at the same time, | |
3823 | * it explicitly notifies us that it finished resync. | |
3824 | * Maybe we should finish it up, too? */ | |
3825 | else if (os.conn >= C_SYNC_SOURCE && | |
3826 | peer_state.conn == C_CONNECTED) { | |
3827 | if (drbd_bm_total_weight(mdev) <= mdev->rs_failed) | |
3828 | drbd_resync_finished(mdev); | |
82bc0194 | 3829 | return 0; |
e9ef7bb6 LE |
3830 | } |
3831 | } | |
3832 | ||
3833 | /* peer says his disk is inconsistent, while we think it is uptodate, | |
3834 | * and this happens while the peer still thinks we have a sync going on, | |
3835 | * but we think we are already done with the sync. | |
3836 | * We ignore this to avoid flapping pdsk. | |
3837 | * This should not happen, if the peer is a recent version of drbd. */ | |
3838 | if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && | |
3839 | os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) | |
3840 | real_peer_disk = D_UP_TO_DATE; | |
3841 | ||
4ac4aada LE |
3842 | if (ns.conn == C_WF_REPORT_PARAMS) |
3843 | ns.conn = C_CONNECTED; | |
b411b363 | 3844 | |
67531718 PR |
3845 | if (peer_state.conn == C_AHEAD) |
3846 | ns.conn = C_BEHIND; | |
3847 | ||
b411b363 PR |
3848 | if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING && |
3849 | get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
3850 | int cr; /* consider resync */ | |
3851 | ||
3852 | /* if we established a new connection */ | |
4ac4aada | 3853 | cr = (os.conn < C_CONNECTED); |
b411b363 PR |
3854 | /* if we had an established connection |
3855 | * and one of the nodes newly attaches a disk */ | |
4ac4aada | 3856 | cr |= (os.conn == C_CONNECTED && |
b411b363 | 3857 | (peer_state.disk == D_NEGOTIATING || |
4ac4aada | 3858 | os.disk == D_NEGOTIATING)); |
b411b363 PR |
3859 | /* if we have both been inconsistent, and the peer has been |
3860 | * forced to be UpToDate with --overwrite-data */ | |
3861 | cr |= test_bit(CONSIDER_RESYNC, &mdev->flags); | |
3862 | /* if we had been plain connected, and the admin requested to | |
3863 | * start a sync by "invalidate" or "invalidate-remote" */ | |
4ac4aada | 3864 | cr |= (os.conn == C_CONNECTED && |
b411b363 PR |
3865 | (peer_state.conn >= C_STARTING_SYNC_S && |
3866 | peer_state.conn <= C_WF_BITMAP_T)); | |
3867 | ||
3868 | if (cr) | |
4ac4aada | 3869 | ns.conn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk); |
b411b363 PR |
3870 | |
3871 | put_ldev(mdev); | |
4ac4aada LE |
3872 | if (ns.conn == C_MASK) { |
3873 | ns.conn = C_CONNECTED; | |
b411b363 | 3874 | if (mdev->state.disk == D_NEGOTIATING) { |
82f59cc6 | 3875 | drbd_force_state(mdev, NS(disk, D_FAILED)); |
b411b363 PR |
3876 | } else if (peer_state.disk == D_NEGOTIATING) { |
3877 | dev_err(DEV, "Disk attach process on the peer node was aborted.\n"); | |
3878 | peer_state.disk = D_DISKLESS; | |
580b9767 | 3879 | real_peer_disk = D_DISKLESS; |
b411b363 | 3880 | } else { |
8169e41b | 3881 | if (test_and_clear_bit(CONN_DRY_RUN, &mdev->tconn->flags)) |
82bc0194 | 3882 | return -EIO; |
4ac4aada | 3883 | D_ASSERT(os.conn == C_WF_REPORT_PARAMS); |
38fa9988 | 3884 | conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 3885 | return -EIO; |
b411b363 PR |
3886 | } |
3887 | } | |
3888 | } | |
3889 | ||
87eeee41 | 3890 | spin_lock_irq(&mdev->tconn->req_lock); |
78bae59b | 3891 | if (os.i != drbd_read_state(mdev).i) |
b411b363 PR |
3892 | goto retry; |
3893 | clear_bit(CONSIDER_RESYNC, &mdev->flags); | |
b411b363 PR |
3894 | ns.peer = peer_state.role; |
3895 | ns.pdsk = real_peer_disk; | |
3896 | ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); | |
4ac4aada | 3897 | if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) |
b411b363 | 3898 | ns.disk = mdev->new_state_tmp.disk; |
4ac4aada | 3899 | cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); |
2aebfabb | 3900 | if (ns.pdsk == D_CONSISTENT && drbd_suspended(mdev) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && |
481c6f50 | 3901 | test_bit(NEW_CUR_UUID, &mdev->flags)) { |
8554df1c | 3902 | /* Do not allow tl_restart(RESEND) for a rebooted peer. We can only allow this |
481c6f50 | 3903 | for temporal network outages! */ |
87eeee41 | 3904 | spin_unlock_irq(&mdev->tconn->req_lock); |
481c6f50 | 3905 | dev_err(DEV, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); |
2f5cdd0b | 3906 | tl_clear(mdev->tconn); |
481c6f50 PR |
3907 | drbd_uuid_new_current(mdev); |
3908 | clear_bit(NEW_CUR_UUID, &mdev->flags); | |
38fa9988 | 3909 | conn_request_state(mdev->tconn, NS2(conn, C_PROTOCOL_ERROR, susp, 0), CS_HARD); |
82bc0194 | 3910 | return -EIO; |
481c6f50 | 3911 | } |
65d922c3 | 3912 | rv = _drbd_set_state(mdev, ns, cs_flags, NULL); |
78bae59b | 3913 | ns = drbd_read_state(mdev); |
87eeee41 | 3914 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
3915 | |
3916 | if (rv < SS_SUCCESS) { | |
38fa9988 | 3917 | conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 3918 | return -EIO; |
b411b363 PR |
3919 | } |
3920 | ||
4ac4aada LE |
3921 | if (os.conn > C_WF_REPORT_PARAMS) { |
3922 | if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED && | |
b411b363 PR |
3923 | peer_state.disk != D_NEGOTIATING ) { |
3924 | /* we want resync, peer has not yet decided to sync... */ | |
3925 | /* Nowadays only used when forcing a node into primary role and | |
3926 | setting its disk to UpToDate with that */ | |
3927 | drbd_send_uuids(mdev); | |
43de7c85 | 3928 | drbd_send_current_state(mdev); |
b411b363 PR |
3929 | } |
3930 | } | |
3931 | ||
08b165ba | 3932 | clear_bit(DISCARD_MY_DATA, &mdev->flags); |
b411b363 PR |
3933 | |
3934 | drbd_md_sync(mdev); /* update connected indicator, la_size, ... */ | |
3935 | ||
82bc0194 | 3936 | return 0; |
b411b363 PR |
3937 | } |
3938 | ||
4a76b161 | 3939 | static int receive_sync_uuid(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 3940 | { |
4a76b161 | 3941 | struct drbd_conf *mdev; |
e658983a | 3942 | struct p_rs_uuid *p = pi->data; |
4a76b161 AG |
3943 | |
3944 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
3945 | if (!mdev) | |
3946 | return -EIO; | |
b411b363 PR |
3947 | |
3948 | wait_event(mdev->misc_wait, | |
3949 | mdev->state.conn == C_WF_SYNC_UUID || | |
c4752ef1 | 3950 | mdev->state.conn == C_BEHIND || |
b411b363 PR |
3951 | mdev->state.conn < C_CONNECTED || |
3952 | mdev->state.disk < D_NEGOTIATING); | |
3953 | ||
3954 | /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */ | |
3955 | ||
b411b363 PR |
3956 | /* Here the _drbd_uuid_ functions are right, current should |
3957 | _not_ be rotated into the history */ | |
3958 | if (get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
3959 | _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid)); | |
3960 | _drbd_uuid_set(mdev, UI_BITMAP, 0UL); | |
3961 | ||
62b0da3a | 3962 | drbd_print_uuids(mdev, "updated sync uuid"); |
b411b363 PR |
3963 | drbd_start_resync(mdev, C_SYNC_TARGET); |
3964 | ||
3965 | put_ldev(mdev); | |
3966 | } else | |
3967 | dev_err(DEV, "Ignoring SyncUUID packet!\n"); | |
3968 | ||
82bc0194 | 3969 | return 0; |
b411b363 PR |
3970 | } |
3971 | ||
2c46407d AG |
3972 | /** |
3973 | * receive_bitmap_plain | |
3974 | * | |
3975 | * Return 0 when done, 1 when another iteration is needed, and a negative error | |
3976 | * code upon failure. | |
3977 | */ | |
3978 | static int | |
50d0b1ad | 3979 | receive_bitmap_plain(struct drbd_conf *mdev, unsigned int size, |
e658983a | 3980 | unsigned long *p, struct bm_xfer_ctx *c) |
b411b363 | 3981 | { |
50d0b1ad AG |
3982 | unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - |
3983 | drbd_header_size(mdev->tconn); | |
e658983a | 3984 | unsigned int num_words = min_t(size_t, data_size / sizeof(*p), |
50d0b1ad | 3985 | c->bm_words - c->word_offset); |
e658983a | 3986 | unsigned int want = num_words * sizeof(*p); |
2c46407d | 3987 | int err; |
b411b363 | 3988 | |
50d0b1ad AG |
3989 | if (want != size) { |
3990 | dev_err(DEV, "%s:want (%u) != size (%u)\n", __func__, want, size); | |
2c46407d | 3991 | return -EIO; |
b411b363 PR |
3992 | } |
3993 | if (want == 0) | |
2c46407d | 3994 | return 0; |
e658983a | 3995 | err = drbd_recv_all(mdev->tconn, p, want); |
82bc0194 | 3996 | if (err) |
2c46407d | 3997 | return err; |
b411b363 | 3998 | |
e658983a | 3999 | drbd_bm_merge_lel(mdev, c->word_offset, num_words, p); |
b411b363 PR |
4000 | |
4001 | c->word_offset += num_words; | |
4002 | c->bit_offset = c->word_offset * BITS_PER_LONG; | |
4003 | if (c->bit_offset > c->bm_bits) | |
4004 | c->bit_offset = c->bm_bits; | |
4005 | ||
2c46407d | 4006 | return 1; |
b411b363 PR |
4007 | } |
4008 | ||
a02d1240 AG |
4009 | static enum drbd_bitmap_code dcbp_get_code(struct p_compressed_bm *p) |
4010 | { | |
4011 | return (enum drbd_bitmap_code)(p->encoding & 0x0f); | |
4012 | } | |
4013 | ||
4014 | static int dcbp_get_start(struct p_compressed_bm *p) | |
4015 | { | |
4016 | return (p->encoding & 0x80) != 0; | |
4017 | } | |
4018 | ||
4019 | static int dcbp_get_pad_bits(struct p_compressed_bm *p) | |
4020 | { | |
4021 | return (p->encoding >> 4) & 0x7; | |
4022 | } | |
4023 | ||
2c46407d AG |
4024 | /** |
4025 | * recv_bm_rle_bits | |
4026 | * | |
4027 | * Return 0 when done, 1 when another iteration is needed, and a negative error | |
4028 | * code upon failure. | |
4029 | */ | |
4030 | static int | |
b411b363 PR |
4031 | recv_bm_rle_bits(struct drbd_conf *mdev, |
4032 | struct p_compressed_bm *p, | |
c6d25cfe PR |
4033 | struct bm_xfer_ctx *c, |
4034 | unsigned int len) | |
b411b363 PR |
4035 | { |
4036 | struct bitstream bs; | |
4037 | u64 look_ahead; | |
4038 | u64 rl; | |
4039 | u64 tmp; | |
4040 | unsigned long s = c->bit_offset; | |
4041 | unsigned long e; | |
a02d1240 | 4042 | int toggle = dcbp_get_start(p); |
b411b363 PR |
4043 | int have; |
4044 | int bits; | |
4045 | ||
a02d1240 | 4046 | bitstream_init(&bs, p->code, len, dcbp_get_pad_bits(p)); |
b411b363 PR |
4047 | |
4048 | bits = bitstream_get_bits(&bs, &look_ahead, 64); | |
4049 | if (bits < 0) | |
2c46407d | 4050 | return -EIO; |
b411b363 PR |
4051 | |
4052 | for (have = bits; have > 0; s += rl, toggle = !toggle) { | |
4053 | bits = vli_decode_bits(&rl, look_ahead); | |
4054 | if (bits <= 0) | |
2c46407d | 4055 | return -EIO; |
b411b363 PR |
4056 | |
4057 | if (toggle) { | |
4058 | e = s + rl -1; | |
4059 | if (e >= c->bm_bits) { | |
4060 | dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); | |
2c46407d | 4061 | return -EIO; |
b411b363 PR |
4062 | } |
4063 | _drbd_bm_set_bits(mdev, s, e); | |
4064 | } | |
4065 | ||
4066 | if (have < bits) { | |
4067 | dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", | |
4068 | have, bits, look_ahead, | |
4069 | (unsigned int)(bs.cur.b - p->code), | |
4070 | (unsigned int)bs.buf_len); | |
2c46407d | 4071 | return -EIO; |
b411b363 PR |
4072 | } |
4073 | look_ahead >>= bits; | |
4074 | have -= bits; | |
4075 | ||
4076 | bits = bitstream_get_bits(&bs, &tmp, 64 - have); | |
4077 | if (bits < 0) | |
2c46407d | 4078 | return -EIO; |
b411b363 PR |
4079 | look_ahead |= tmp << have; |
4080 | have += bits; | |
4081 | } | |
4082 | ||
4083 | c->bit_offset = s; | |
4084 | bm_xfer_ctx_bit_to_word_offset(c); | |
4085 | ||
2c46407d | 4086 | return (s != c->bm_bits); |
b411b363 PR |
4087 | } |
4088 | ||
2c46407d AG |
4089 | /** |
4090 | * decode_bitmap_c | |
4091 | * | |
4092 | * Return 0 when done, 1 when another iteration is needed, and a negative error | |
4093 | * code upon failure. | |
4094 | */ | |
4095 | static int | |
b411b363 PR |
4096 | decode_bitmap_c(struct drbd_conf *mdev, |
4097 | struct p_compressed_bm *p, | |
c6d25cfe PR |
4098 | struct bm_xfer_ctx *c, |
4099 | unsigned int len) | |
b411b363 | 4100 | { |
a02d1240 | 4101 | if (dcbp_get_code(p) == RLE_VLI_Bits) |
e658983a | 4102 | return recv_bm_rle_bits(mdev, p, c, len - sizeof(*p)); |
b411b363 PR |
4103 | |
4104 | /* other variants had been implemented for evaluation, | |
4105 | * but have been dropped as this one turned out to be "best" | |
4106 | * during all our tests. */ | |
4107 | ||
4108 | dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding); | |
38fa9988 | 4109 | conn_request_state(mdev->tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); |
2c46407d | 4110 | return -EIO; |
b411b363 PR |
4111 | } |
4112 | ||
4113 | void INFO_bm_xfer_stats(struct drbd_conf *mdev, | |
4114 | const char *direction, struct bm_xfer_ctx *c) | |
4115 | { | |
4116 | /* what would it take to transfer it "plaintext" */ | |
50d0b1ad AG |
4117 | unsigned int header_size = drbd_header_size(mdev->tconn); |
4118 | unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - header_size; | |
4119 | unsigned int plain = | |
4120 | header_size * (DIV_ROUND_UP(c->bm_words, data_size) + 1) + | |
4121 | c->bm_words * sizeof(unsigned long); | |
4122 | unsigned int total = c->bytes[0] + c->bytes[1]; | |
4123 | unsigned int r; | |
b411b363 PR |
4124 | |
4125 | /* total can not be zero. but just in case: */ | |
4126 | if (total == 0) | |
4127 | return; | |
4128 | ||
4129 | /* don't report if not compressed */ | |
4130 | if (total >= plain) | |
4131 | return; | |
4132 | ||
4133 | /* total < plain. check for overflow, still */ | |
4134 | r = (total > UINT_MAX/1000) ? (total / (plain/1000)) | |
4135 | : (1000 * total / plain); | |
4136 | ||
4137 | if (r > 1000) | |
4138 | r = 1000; | |
4139 | ||
4140 | r = 1000 - r; | |
4141 | dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " | |
4142 | "total %u; compression: %u.%u%%\n", | |
4143 | direction, | |
4144 | c->bytes[1], c->packets[1], | |
4145 | c->bytes[0], c->packets[0], | |
4146 | total, r/10, r % 10); | |
4147 | } | |
4148 | ||
4149 | /* Since we are processing the bitfield from lower addresses to higher, | |
4150 | it does not matter if the process it in 32 bit chunks or 64 bit | |
4151 | chunks as long as it is little endian. (Understand it as byte stream, | |
4152 | beginning with the lowest byte...) If we would use big endian | |
4153 | we would need to process it from the highest address to the lowest, | |
4154 | in order to be agnostic to the 32 vs 64 bits issue. | |
4155 | ||
4156 | returns 0 on failure, 1 if we successfully received it. */ | |
4a76b161 | 4157 | static int receive_bitmap(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4158 | { |
4a76b161 | 4159 | struct drbd_conf *mdev; |
b411b363 | 4160 | struct bm_xfer_ctx c; |
2c46407d | 4161 | int err; |
4a76b161 AG |
4162 | |
4163 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
4164 | if (!mdev) | |
4165 | return -EIO; | |
b411b363 | 4166 | |
20ceb2b2 LE |
4167 | drbd_bm_lock(mdev, "receive bitmap", BM_LOCKED_SET_ALLOWED); |
4168 | /* you are supposed to send additional out-of-sync information | |
4169 | * if you actually set bits during this phase */ | |
b411b363 | 4170 | |
b411b363 PR |
4171 | c = (struct bm_xfer_ctx) { |
4172 | .bm_bits = drbd_bm_bits(mdev), | |
4173 | .bm_words = drbd_bm_words(mdev), | |
4174 | }; | |
4175 | ||
2c46407d | 4176 | for(;;) { |
e658983a AG |
4177 | if (pi->cmd == P_BITMAP) |
4178 | err = receive_bitmap_plain(mdev, pi->size, pi->data, &c); | |
4179 | else if (pi->cmd == P_COMPRESSED_BITMAP) { | |
b411b363 PR |
4180 | /* MAYBE: sanity check that we speak proto >= 90, |
4181 | * and the feature is enabled! */ | |
e658983a | 4182 | struct p_compressed_bm *p = pi->data; |
b411b363 | 4183 | |
50d0b1ad | 4184 | if (pi->size > DRBD_SOCKET_BUFFER_SIZE - drbd_header_size(tconn)) { |
b411b363 | 4185 | dev_err(DEV, "ReportCBitmap packet too large\n"); |
82bc0194 | 4186 | err = -EIO; |
b411b363 PR |
4187 | goto out; |
4188 | } | |
e658983a | 4189 | if (pi->size <= sizeof(*p)) { |
e2857216 | 4190 | dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", pi->size); |
82bc0194 | 4191 | err = -EIO; |
78fcbdae | 4192 | goto out; |
b411b363 | 4193 | } |
e658983a AG |
4194 | err = drbd_recv_all(mdev->tconn, p, pi->size); |
4195 | if (err) | |
4196 | goto out; | |
e2857216 | 4197 | err = decode_bitmap_c(mdev, p, &c, pi->size); |
b411b363 | 4198 | } else { |
e2857216 | 4199 | dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", pi->cmd); |
82bc0194 | 4200 | err = -EIO; |
b411b363 PR |
4201 | goto out; |
4202 | } | |
4203 | ||
e2857216 | 4204 | c.packets[pi->cmd == P_BITMAP]++; |
50d0b1ad | 4205 | c.bytes[pi->cmd == P_BITMAP] += drbd_header_size(tconn) + pi->size; |
b411b363 | 4206 | |
2c46407d AG |
4207 | if (err <= 0) { |
4208 | if (err < 0) | |
4209 | goto out; | |
b411b363 | 4210 | break; |
2c46407d | 4211 | } |
e2857216 | 4212 | err = drbd_recv_header(mdev->tconn, pi); |
82bc0194 | 4213 | if (err) |
b411b363 | 4214 | goto out; |
2c46407d | 4215 | } |
b411b363 PR |
4216 | |
4217 | INFO_bm_xfer_stats(mdev, "receive", &c); | |
4218 | ||
4219 | if (mdev->state.conn == C_WF_BITMAP_T) { | |
de1f8e4a AG |
4220 | enum drbd_state_rv rv; |
4221 | ||
82bc0194 AG |
4222 | err = drbd_send_bitmap(mdev); |
4223 | if (err) | |
b411b363 PR |
4224 | goto out; |
4225 | /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ | |
de1f8e4a AG |
4226 | rv = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); |
4227 | D_ASSERT(rv == SS_SUCCESS); | |
b411b363 PR |
4228 | } else if (mdev->state.conn != C_WF_BITMAP_S) { |
4229 | /* admin may have requested C_DISCONNECTING, | |
4230 | * other threads may have noticed network errors */ | |
4231 | dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n", | |
4232 | drbd_conn_str(mdev->state.conn)); | |
4233 | } | |
82bc0194 | 4234 | err = 0; |
b411b363 | 4235 | |
b411b363 | 4236 | out: |
20ceb2b2 | 4237 | drbd_bm_unlock(mdev); |
82bc0194 | 4238 | if (!err && mdev->state.conn == C_WF_BITMAP_S) |
b411b363 | 4239 | drbd_start_resync(mdev, C_SYNC_SOURCE); |
82bc0194 | 4240 | return err; |
b411b363 PR |
4241 | } |
4242 | ||
4a76b161 | 4243 | static int receive_skip(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4244 | { |
4a76b161 | 4245 | conn_warn(tconn, "skipping unknown optional packet type %d, l: %d!\n", |
e2857216 | 4246 | pi->cmd, pi->size); |
2de876ef | 4247 | |
4a76b161 | 4248 | return ignore_remaining_packet(tconn, pi); |
2de876ef PR |
4249 | } |
4250 | ||
4a76b161 | 4251 | static int receive_UnplugRemote(struct drbd_tconn *tconn, struct packet_info *pi) |
0ced55a3 | 4252 | { |
e7f52dfb LE |
4253 | /* Make sure we've acked all the TCP data associated |
4254 | * with the data requests being unplugged */ | |
4a76b161 | 4255 | drbd_tcp_quickack(tconn->data.socket); |
0ced55a3 | 4256 | |
82bc0194 | 4257 | return 0; |
0ced55a3 PR |
4258 | } |
4259 | ||
4a76b161 | 4260 | static int receive_out_of_sync(struct drbd_tconn *tconn, struct packet_info *pi) |
73a01a18 | 4261 | { |
4a76b161 | 4262 | struct drbd_conf *mdev; |
e658983a | 4263 | struct p_block_desc *p = pi->data; |
4a76b161 AG |
4264 | |
4265 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
4266 | if (!mdev) | |
4267 | return -EIO; | |
73a01a18 | 4268 | |
f735e363 LE |
4269 | switch (mdev->state.conn) { |
4270 | case C_WF_SYNC_UUID: | |
4271 | case C_WF_BITMAP_T: | |
4272 | case C_BEHIND: | |
4273 | break; | |
4274 | default: | |
4275 | dev_err(DEV, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n", | |
4276 | drbd_conn_str(mdev->state.conn)); | |
4277 | } | |
4278 | ||
73a01a18 PR |
4279 | drbd_set_out_of_sync(mdev, be64_to_cpu(p->sector), be32_to_cpu(p->blksize)); |
4280 | ||
82bc0194 | 4281 | return 0; |
73a01a18 PR |
4282 | } |
4283 | ||
02918be2 PR |
4284 | struct data_cmd { |
4285 | int expect_payload; | |
4286 | size_t pkt_size; | |
4a76b161 | 4287 | int (*fn)(struct drbd_tconn *, struct packet_info *); |
02918be2 PR |
4288 | }; |
4289 | ||
4290 | static struct data_cmd drbd_cmd_handler[] = { | |
4a76b161 AG |
4291 | [P_DATA] = { 1, sizeof(struct p_data), receive_Data }, |
4292 | [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply }, | |
4293 | [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } , | |
4294 | [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } , | |
e658983a AG |
4295 | [P_BITMAP] = { 1, 0, receive_bitmap } , |
4296 | [P_COMPRESSED_BITMAP] = { 1, 0, receive_bitmap } , | |
4297 | [P_UNPLUG_REMOTE] = { 0, 0, receive_UnplugRemote }, | |
4a76b161 AG |
4298 | [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, |
4299 | [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, | |
e658983a AG |
4300 | [P_SYNC_PARAM] = { 1, 0, receive_SyncParam }, |
4301 | [P_SYNC_PARAM89] = { 1, 0, receive_SyncParam }, | |
4a76b161 AG |
4302 | [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol }, |
4303 | [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids }, | |
4304 | [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes }, | |
4305 | [P_STATE] = { 0, sizeof(struct p_state), receive_state }, | |
4306 | [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state }, | |
4307 | [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid }, | |
4308 | [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, | |
4309 | [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest }, | |
4310 | [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest }, | |
4311 | [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip }, | |
4312 | [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync }, | |
4313 | [P_CONN_ST_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_conn_state }, | |
036b17ea | 4314 | [P_PROTOCOL_UPDATE] = { 1, sizeof(struct p_protocol), receive_protocol }, |
b411b363 PR |
4315 | }; |
4316 | ||
eefc2f7d | 4317 | static void drbdd(struct drbd_tconn *tconn) |
b411b363 | 4318 | { |
77351055 | 4319 | struct packet_info pi; |
02918be2 | 4320 | size_t shs; /* sub header size */ |
82bc0194 | 4321 | int err; |
b411b363 | 4322 | |
eefc2f7d | 4323 | while (get_t_state(&tconn->receiver) == RUNNING) { |
deebe195 AG |
4324 | struct data_cmd *cmd; |
4325 | ||
eefc2f7d | 4326 | drbd_thread_current_set_cpu(&tconn->receiver); |
69bc7bc3 | 4327 | if (drbd_recv_header(tconn, &pi)) |
02918be2 | 4328 | goto err_out; |
b411b363 | 4329 | |
deebe195 | 4330 | cmd = &drbd_cmd_handler[pi.cmd]; |
4a76b161 | 4331 | if (unlikely(pi.cmd >= ARRAY_SIZE(drbd_cmd_handler) || !cmd->fn)) { |
2fcb8f30 AG |
4332 | conn_err(tconn, "Unexpected data packet %s (0x%04x)", |
4333 | cmdname(pi.cmd), pi.cmd); | |
02918be2 | 4334 | goto err_out; |
0b33a916 | 4335 | } |
b411b363 | 4336 | |
e658983a AG |
4337 | shs = cmd->pkt_size; |
4338 | if (pi.size > shs && !cmd->expect_payload) { | |
2fcb8f30 AG |
4339 | conn_err(tconn, "No payload expected %s l:%d\n", |
4340 | cmdname(pi.cmd), pi.size); | |
02918be2 | 4341 | goto err_out; |
b411b363 | 4342 | } |
b411b363 | 4343 | |
c13f7e1a | 4344 | if (shs) { |
e658983a | 4345 | err = drbd_recv_all_warn(tconn, pi.data, shs); |
a5c31904 | 4346 | if (err) |
c13f7e1a | 4347 | goto err_out; |
e2857216 | 4348 | pi.size -= shs; |
c13f7e1a LE |
4349 | } |
4350 | ||
4a76b161 AG |
4351 | err = cmd->fn(tconn, &pi); |
4352 | if (err) { | |
9f5bdc33 AG |
4353 | conn_err(tconn, "error receiving %s, e: %d l: %d!\n", |
4354 | cmdname(pi.cmd), err, pi.size); | |
02918be2 | 4355 | goto err_out; |
b411b363 PR |
4356 | } |
4357 | } | |
82bc0194 | 4358 | return; |
b411b363 | 4359 | |
82bc0194 AG |
4360 | err_out: |
4361 | conn_request_state(tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); | |
b411b363 PR |
4362 | } |
4363 | ||
0e29d163 | 4364 | void conn_flush_workqueue(struct drbd_tconn *tconn) |
b411b363 PR |
4365 | { |
4366 | struct drbd_wq_barrier barr; | |
4367 | ||
4368 | barr.w.cb = w_prev_work_done; | |
0e29d163 | 4369 | barr.w.tconn = tconn; |
b411b363 | 4370 | init_completion(&barr.done); |
0e29d163 | 4371 | drbd_queue_work(&tconn->data.work, &barr.w); |
b411b363 PR |
4372 | wait_for_completion(&barr.done); |
4373 | } | |
4374 | ||
81fa2e67 | 4375 | static void conn_disconnect(struct drbd_tconn *tconn) |
b411b363 | 4376 | { |
c141ebda | 4377 | struct drbd_conf *mdev; |
bbeb641c | 4378 | enum drbd_conns oc; |
376694a0 | 4379 | int vnr; |
b411b363 | 4380 | |
bbeb641c | 4381 | if (tconn->cstate == C_STANDALONE) |
b411b363 | 4382 | return; |
b411b363 | 4383 | |
b8853dbd PR |
4384 | /* We are about to start the cleanup after connection loss. |
4385 | * Make sure drbd_make_request knows about that. | |
4386 | * Usually we should be in some network failure state already, | |
4387 | * but just in case we are not, we fix it up here. | |
4388 | */ | |
4389 | conn_request_state(tconn, NS(conn, C_NETWORK_FAILURE), CS_HARD); | |
4390 | ||
b411b363 | 4391 | /* asender does not clean up anything. it must not interfere, either */ |
360cc740 PR |
4392 | drbd_thread_stop(&tconn->asender); |
4393 | drbd_free_sock(tconn); | |
4394 | ||
c141ebda PR |
4395 | rcu_read_lock(); |
4396 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { | |
4397 | kref_get(&mdev->kref); | |
4398 | rcu_read_unlock(); | |
4399 | drbd_disconnected(mdev); | |
4400 | kref_put(&mdev->kref, &drbd_minor_destroy); | |
4401 | rcu_read_lock(); | |
4402 | } | |
4403 | rcu_read_unlock(); | |
4404 | ||
12038a3a PR |
4405 | if (!list_empty(&tconn->current_epoch->list)) |
4406 | conn_err(tconn, "ASSERTION FAILED: tconn->current_epoch->list not empty\n"); | |
4407 | /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ | |
4408 | atomic_set(&tconn->current_epoch->epoch_size, 0); | |
4409 | ||
360cc740 PR |
4410 | conn_info(tconn, "Connection closed\n"); |
4411 | ||
cb703454 PR |
4412 | if (conn_highest_role(tconn) == R_PRIMARY && conn_highest_pdsk(tconn) >= D_UNKNOWN) |
4413 | conn_try_outdate_peer_async(tconn); | |
4414 | ||
360cc740 | 4415 | spin_lock_irq(&tconn->req_lock); |
bbeb641c PR |
4416 | oc = tconn->cstate; |
4417 | if (oc >= C_UNCONNECTED) | |
376694a0 | 4418 | _conn_request_state(tconn, NS(conn, C_UNCONNECTED), CS_VERBOSE); |
bbeb641c | 4419 | |
360cc740 PR |
4420 | spin_unlock_irq(&tconn->req_lock); |
4421 | ||
f3dfa40a | 4422 | if (oc == C_DISCONNECTING) |
d9cc6e23 | 4423 | conn_request_state(tconn, NS(conn, C_STANDALONE), CS_VERBOSE | CS_HARD); |
360cc740 PR |
4424 | } |
4425 | ||
c141ebda | 4426 | static int drbd_disconnected(struct drbd_conf *mdev) |
360cc740 | 4427 | { |
360cc740 | 4428 | unsigned int i; |
b411b363 | 4429 | |
85719573 | 4430 | /* wait for current activity to cease. */ |
87eeee41 | 4431 | spin_lock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
4432 | _drbd_wait_ee_list_empty(mdev, &mdev->active_ee); |
4433 | _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee); | |
4434 | _drbd_wait_ee_list_empty(mdev, &mdev->read_ee); | |
87eeee41 | 4435 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
4436 | |
4437 | /* We do not have data structures that would allow us to | |
4438 | * get the rs_pending_cnt down to 0 again. | |
4439 | * * On C_SYNC_TARGET we do not have any data structures describing | |
4440 | * the pending RSDataRequest's we have sent. | |
4441 | * * On C_SYNC_SOURCE there is no data structure that tracks | |
4442 | * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. | |
4443 | * And no, it is not the sum of the reference counts in the | |
4444 | * resync_LRU. The resync_LRU tracks the whole operation including | |
4445 | * the disk-IO, while the rs_pending_cnt only tracks the blocks | |
4446 | * on the fly. */ | |
4447 | drbd_rs_cancel_all(mdev); | |
4448 | mdev->rs_total = 0; | |
4449 | mdev->rs_failed = 0; | |
4450 | atomic_set(&mdev->rs_pending_cnt, 0); | |
4451 | wake_up(&mdev->misc_wait); | |
4452 | ||
b411b363 | 4453 | del_timer_sync(&mdev->resync_timer); |
b411b363 PR |
4454 | resync_timer_fn((unsigned long)mdev); |
4455 | ||
b411b363 PR |
4456 | /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, |
4457 | * w_make_resync_request etc. which may still be on the worker queue | |
4458 | * to be "canceled" */ | |
a21e9298 | 4459 | drbd_flush_workqueue(mdev); |
b411b363 | 4460 | |
a990be46 | 4461 | drbd_finish_peer_reqs(mdev); |
b411b363 | 4462 | |
d10b4ea3 PR |
4463 | /* This second workqueue flush is necessary, since drbd_finish_peer_reqs() |
4464 | might have issued a work again. The one before drbd_finish_peer_reqs() is | |
4465 | necessary to reclain net_ee in drbd_finish_peer_reqs(). */ | |
4466 | drbd_flush_workqueue(mdev); | |
4467 | ||
b411b363 PR |
4468 | kfree(mdev->p_uuid); |
4469 | mdev->p_uuid = NULL; | |
4470 | ||
2aebfabb | 4471 | if (!drbd_suspended(mdev)) |
2f5cdd0b | 4472 | tl_clear(mdev->tconn); |
b411b363 | 4473 | |
b411b363 PR |
4474 | drbd_md_sync(mdev); |
4475 | ||
20ceb2b2 LE |
4476 | /* serialize with bitmap writeout triggered by the state change, |
4477 | * if any. */ | |
4478 | wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags)); | |
4479 | ||
b411b363 PR |
4480 | /* tcp_close and release of sendpage pages can be deferred. I don't |
4481 | * want to use SO_LINGER, because apparently it can be deferred for | |
4482 | * more than 20 seconds (longest time I checked). | |
4483 | * | |
4484 | * Actually we don't care for exactly when the network stack does its | |
4485 | * put_page(), but release our reference on these pages right here. | |
4486 | */ | |
7721f567 | 4487 | i = drbd_free_peer_reqs(mdev, &mdev->net_ee); |
b411b363 PR |
4488 | if (i) |
4489 | dev_info(DEV, "net_ee not empty, killed %u entries\n", i); | |
435f0740 LE |
4490 | i = atomic_read(&mdev->pp_in_use_by_net); |
4491 | if (i) | |
4492 | dev_info(DEV, "pp_in_use_by_net = %d, expected 0\n", i); | |
b411b363 PR |
4493 | i = atomic_read(&mdev->pp_in_use); |
4494 | if (i) | |
45bb912b | 4495 | dev_info(DEV, "pp_in_use = %d, expected 0\n", i); |
b411b363 PR |
4496 | |
4497 | D_ASSERT(list_empty(&mdev->read_ee)); | |
4498 | D_ASSERT(list_empty(&mdev->active_ee)); | |
4499 | D_ASSERT(list_empty(&mdev->sync_ee)); | |
4500 | D_ASSERT(list_empty(&mdev->done_ee)); | |
4501 | ||
360cc740 | 4502 | return 0; |
b411b363 PR |
4503 | } |
4504 | ||
4505 | /* | |
4506 | * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version | |
4507 | * we can agree on is stored in agreed_pro_version. | |
4508 | * | |
4509 | * feature flags and the reserved array should be enough room for future | |
4510 | * enhancements of the handshake protocol, and possible plugins... | |
4511 | * | |
4512 | * for now, they are expected to be zero, but ignored. | |
4513 | */ | |
6038178e | 4514 | static int drbd_send_features(struct drbd_tconn *tconn) |
b411b363 | 4515 | { |
9f5bdc33 AG |
4516 | struct drbd_socket *sock; |
4517 | struct p_connection_features *p; | |
b411b363 | 4518 | |
9f5bdc33 AG |
4519 | sock = &tconn->data; |
4520 | p = conn_prepare_command(tconn, sock); | |
4521 | if (!p) | |
e8d17b01 | 4522 | return -EIO; |
b411b363 PR |
4523 | memset(p, 0, sizeof(*p)); |
4524 | p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); | |
4525 | p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); | |
9f5bdc33 | 4526 | return conn_send_command(tconn, sock, P_CONNECTION_FEATURES, sizeof(*p), NULL, 0); |
b411b363 PR |
4527 | } |
4528 | ||
4529 | /* | |
4530 | * return values: | |
4531 | * 1 yes, we have a valid connection | |
4532 | * 0 oops, did not work out, please try again | |
4533 | * -1 peer talks different language, | |
4534 | * no point in trying again, please go standalone. | |
4535 | */ | |
6038178e | 4536 | static int drbd_do_features(struct drbd_tconn *tconn) |
b411b363 | 4537 | { |
65d11ed6 | 4538 | /* ASSERT current == tconn->receiver ... */ |
e658983a AG |
4539 | struct p_connection_features *p; |
4540 | const int expect = sizeof(struct p_connection_features); | |
77351055 | 4541 | struct packet_info pi; |
a5c31904 | 4542 | int err; |
b411b363 | 4543 | |
6038178e | 4544 | err = drbd_send_features(tconn); |
e8d17b01 | 4545 | if (err) |
b411b363 PR |
4546 | return 0; |
4547 | ||
69bc7bc3 AG |
4548 | err = drbd_recv_header(tconn, &pi); |
4549 | if (err) | |
b411b363 PR |
4550 | return 0; |
4551 | ||
6038178e AG |
4552 | if (pi.cmd != P_CONNECTION_FEATURES) { |
4553 | conn_err(tconn, "expected ConnectionFeatures packet, received: %s (0x%04x)\n", | |
2fcb8f30 | 4554 | cmdname(pi.cmd), pi.cmd); |
b411b363 PR |
4555 | return -1; |
4556 | } | |
4557 | ||
77351055 | 4558 | if (pi.size != expect) { |
6038178e | 4559 | conn_err(tconn, "expected ConnectionFeatures length: %u, received: %u\n", |
77351055 | 4560 | expect, pi.size); |
b411b363 PR |
4561 | return -1; |
4562 | } | |
4563 | ||
e658983a AG |
4564 | p = pi.data; |
4565 | err = drbd_recv_all_warn(tconn, p, expect); | |
a5c31904 | 4566 | if (err) |
b411b363 | 4567 | return 0; |
b411b363 | 4568 | |
b411b363 PR |
4569 | p->protocol_min = be32_to_cpu(p->protocol_min); |
4570 | p->protocol_max = be32_to_cpu(p->protocol_max); | |
4571 | if (p->protocol_max == 0) | |
4572 | p->protocol_max = p->protocol_min; | |
4573 | ||
4574 | if (PRO_VERSION_MAX < p->protocol_min || | |
4575 | PRO_VERSION_MIN > p->protocol_max) | |
4576 | goto incompat; | |
4577 | ||
65d11ed6 | 4578 | tconn->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); |
b411b363 | 4579 | |
65d11ed6 PR |
4580 | conn_info(tconn, "Handshake successful: " |
4581 | "Agreed network protocol version %d\n", tconn->agreed_pro_version); | |
b411b363 PR |
4582 | |
4583 | return 1; | |
4584 | ||
4585 | incompat: | |
65d11ed6 | 4586 | conn_err(tconn, "incompatible DRBD dialects: " |
b411b363 PR |
4587 | "I support %d-%d, peer supports %d-%d\n", |
4588 | PRO_VERSION_MIN, PRO_VERSION_MAX, | |
4589 | p->protocol_min, p->protocol_max); | |
4590 | return -1; | |
4591 | } | |
4592 | ||
4593 | #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) | |
13e6037d | 4594 | static int drbd_do_auth(struct drbd_tconn *tconn) |
b411b363 PR |
4595 | { |
4596 | dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); | |
4597 | dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); | |
b10d96cb | 4598 | return -1; |
b411b363 PR |
4599 | } |
4600 | #else | |
4601 | #define CHALLENGE_LEN 64 | |
b10d96cb JT |
4602 | |
4603 | /* Return value: | |
4604 | 1 - auth succeeded, | |
4605 | 0 - failed, try again (network error), | |
4606 | -1 - auth failed, don't try again. | |
4607 | */ | |
4608 | ||
13e6037d | 4609 | static int drbd_do_auth(struct drbd_tconn *tconn) |
b411b363 | 4610 | { |
9f5bdc33 | 4611 | struct drbd_socket *sock; |
b411b363 PR |
4612 | char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ |
4613 | struct scatterlist sg; | |
4614 | char *response = NULL; | |
4615 | char *right_response = NULL; | |
4616 | char *peers_ch = NULL; | |
44ed167d PR |
4617 | unsigned int key_len; |
4618 | char secret[SHARED_SECRET_MAX]; /* 64 byte */ | |
b411b363 PR |
4619 | unsigned int resp_size; |
4620 | struct hash_desc desc; | |
77351055 | 4621 | struct packet_info pi; |
44ed167d | 4622 | struct net_conf *nc; |
69bc7bc3 | 4623 | int err, rv; |
b411b363 | 4624 | |
9f5bdc33 AG |
4625 | /* FIXME: Put the challenge/response into the preallocated socket buffer. */ |
4626 | ||
44ed167d PR |
4627 | rcu_read_lock(); |
4628 | nc = rcu_dereference(tconn->net_conf); | |
4629 | key_len = strlen(nc->shared_secret); | |
4630 | memcpy(secret, nc->shared_secret, key_len); | |
4631 | rcu_read_unlock(); | |
4632 | ||
13e6037d | 4633 | desc.tfm = tconn->cram_hmac_tfm; |
b411b363 PR |
4634 | desc.flags = 0; |
4635 | ||
44ed167d | 4636 | rv = crypto_hash_setkey(tconn->cram_hmac_tfm, (u8 *)secret, key_len); |
b411b363 | 4637 | if (rv) { |
13e6037d | 4638 | conn_err(tconn, "crypto_hash_setkey() failed with %d\n", rv); |
b10d96cb | 4639 | rv = -1; |
b411b363 PR |
4640 | goto fail; |
4641 | } | |
4642 | ||
4643 | get_random_bytes(my_challenge, CHALLENGE_LEN); | |
4644 | ||
9f5bdc33 AG |
4645 | sock = &tconn->data; |
4646 | if (!conn_prepare_command(tconn, sock)) { | |
4647 | rv = 0; | |
4648 | goto fail; | |
4649 | } | |
e658983a | 4650 | rv = !conn_send_command(tconn, sock, P_AUTH_CHALLENGE, 0, |
9f5bdc33 | 4651 | my_challenge, CHALLENGE_LEN); |
b411b363 PR |
4652 | if (!rv) |
4653 | goto fail; | |
4654 | ||
69bc7bc3 AG |
4655 | err = drbd_recv_header(tconn, &pi); |
4656 | if (err) { | |
4657 | rv = 0; | |
b411b363 | 4658 | goto fail; |
69bc7bc3 | 4659 | } |
b411b363 | 4660 | |
77351055 | 4661 | if (pi.cmd != P_AUTH_CHALLENGE) { |
13e6037d | 4662 | conn_err(tconn, "expected AuthChallenge packet, received: %s (0x%04x)\n", |
2fcb8f30 | 4663 | cmdname(pi.cmd), pi.cmd); |
b411b363 PR |
4664 | rv = 0; |
4665 | goto fail; | |
4666 | } | |
4667 | ||
77351055 | 4668 | if (pi.size > CHALLENGE_LEN * 2) { |
13e6037d | 4669 | conn_err(tconn, "expected AuthChallenge payload too big.\n"); |
b10d96cb | 4670 | rv = -1; |
b411b363 PR |
4671 | goto fail; |
4672 | } | |
4673 | ||
77351055 | 4674 | peers_ch = kmalloc(pi.size, GFP_NOIO); |
b411b363 | 4675 | if (peers_ch == NULL) { |
13e6037d | 4676 | conn_err(tconn, "kmalloc of peers_ch failed\n"); |
b10d96cb | 4677 | rv = -1; |
b411b363 PR |
4678 | goto fail; |
4679 | } | |
4680 | ||
a5c31904 AG |
4681 | err = drbd_recv_all_warn(tconn, peers_ch, pi.size); |
4682 | if (err) { | |
b411b363 PR |
4683 | rv = 0; |
4684 | goto fail; | |
4685 | } | |
4686 | ||
13e6037d | 4687 | resp_size = crypto_hash_digestsize(tconn->cram_hmac_tfm); |
b411b363 PR |
4688 | response = kmalloc(resp_size, GFP_NOIO); |
4689 | if (response == NULL) { | |
13e6037d | 4690 | conn_err(tconn, "kmalloc of response failed\n"); |
b10d96cb | 4691 | rv = -1; |
b411b363 PR |
4692 | goto fail; |
4693 | } | |
4694 | ||
4695 | sg_init_table(&sg, 1); | |
77351055 | 4696 | sg_set_buf(&sg, peers_ch, pi.size); |
b411b363 PR |
4697 | |
4698 | rv = crypto_hash_digest(&desc, &sg, sg.length, response); | |
4699 | if (rv) { | |
13e6037d | 4700 | conn_err(tconn, "crypto_hash_digest() failed with %d\n", rv); |
b10d96cb | 4701 | rv = -1; |
b411b363 PR |
4702 | goto fail; |
4703 | } | |
4704 | ||
9f5bdc33 AG |
4705 | if (!conn_prepare_command(tconn, sock)) { |
4706 | rv = 0; | |
4707 | goto fail; | |
4708 | } | |
e658983a | 4709 | rv = !conn_send_command(tconn, sock, P_AUTH_RESPONSE, 0, |
9f5bdc33 | 4710 | response, resp_size); |
b411b363 PR |
4711 | if (!rv) |
4712 | goto fail; | |
4713 | ||
69bc7bc3 AG |
4714 | err = drbd_recv_header(tconn, &pi); |
4715 | if (err) { | |
4716 | rv = 0; | |
b411b363 | 4717 | goto fail; |
69bc7bc3 | 4718 | } |
b411b363 | 4719 | |
77351055 | 4720 | if (pi.cmd != P_AUTH_RESPONSE) { |
13e6037d | 4721 | conn_err(tconn, "expected AuthResponse packet, received: %s (0x%04x)\n", |
2fcb8f30 | 4722 | cmdname(pi.cmd), pi.cmd); |
b411b363 PR |
4723 | rv = 0; |
4724 | goto fail; | |
4725 | } | |
4726 | ||
77351055 | 4727 | if (pi.size != resp_size) { |
13e6037d | 4728 | conn_err(tconn, "expected AuthResponse payload of wrong size\n"); |
b411b363 PR |
4729 | rv = 0; |
4730 | goto fail; | |
4731 | } | |
4732 | ||
a5c31904 AG |
4733 | err = drbd_recv_all_warn(tconn, response , resp_size); |
4734 | if (err) { | |
b411b363 PR |
4735 | rv = 0; |
4736 | goto fail; | |
4737 | } | |
4738 | ||
4739 | right_response = kmalloc(resp_size, GFP_NOIO); | |
2d1ee87d | 4740 | if (right_response == NULL) { |
13e6037d | 4741 | conn_err(tconn, "kmalloc of right_response failed\n"); |
b10d96cb | 4742 | rv = -1; |
b411b363 PR |
4743 | goto fail; |
4744 | } | |
4745 | ||
4746 | sg_set_buf(&sg, my_challenge, CHALLENGE_LEN); | |
4747 | ||
4748 | rv = crypto_hash_digest(&desc, &sg, sg.length, right_response); | |
4749 | if (rv) { | |
13e6037d | 4750 | conn_err(tconn, "crypto_hash_digest() failed with %d\n", rv); |
b10d96cb | 4751 | rv = -1; |
b411b363 PR |
4752 | goto fail; |
4753 | } | |
4754 | ||
4755 | rv = !memcmp(response, right_response, resp_size); | |
4756 | ||
4757 | if (rv) | |
44ed167d PR |
4758 | conn_info(tconn, "Peer authenticated using %d bytes HMAC\n", |
4759 | resp_size); | |
b10d96cb JT |
4760 | else |
4761 | rv = -1; | |
b411b363 PR |
4762 | |
4763 | fail: | |
4764 | kfree(peers_ch); | |
4765 | kfree(response); | |
4766 | kfree(right_response); | |
4767 | ||
4768 | return rv; | |
4769 | } | |
4770 | #endif | |
4771 | ||
4772 | int drbdd_init(struct drbd_thread *thi) | |
4773 | { | |
392c8801 | 4774 | struct drbd_tconn *tconn = thi->tconn; |
b411b363 PR |
4775 | int h; |
4776 | ||
4d641dd7 | 4777 | conn_info(tconn, "receiver (re)started\n"); |
b411b363 PR |
4778 | |
4779 | do { | |
81fa2e67 | 4780 | h = conn_connect(tconn); |
b411b363 | 4781 | if (h == 0) { |
81fa2e67 | 4782 | conn_disconnect(tconn); |
20ee6390 | 4783 | schedule_timeout_interruptible(HZ); |
b411b363 PR |
4784 | } |
4785 | if (h == -1) { | |
4d641dd7 | 4786 | conn_warn(tconn, "Discarding network configuration.\n"); |
bbeb641c | 4787 | conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 PR |
4788 | } |
4789 | } while (h == 0); | |
4790 | ||
91fd4dad PR |
4791 | if (h > 0) |
4792 | drbdd(tconn); | |
b411b363 | 4793 | |
81fa2e67 | 4794 | conn_disconnect(tconn); |
b411b363 | 4795 | |
4d641dd7 | 4796 | conn_info(tconn, "receiver terminated\n"); |
b411b363 PR |
4797 | return 0; |
4798 | } | |
4799 | ||
4800 | /* ********* acknowledge sender ******** */ | |
4801 | ||
e05e1e59 | 4802 | static int got_conn_RqSReply(struct drbd_tconn *tconn, struct packet_info *pi) |
e4f78ede | 4803 | { |
e658983a | 4804 | struct p_req_state_reply *p = pi->data; |
e4f78ede PR |
4805 | int retcode = be32_to_cpu(p->retcode); |
4806 | ||
4807 | if (retcode >= SS_SUCCESS) { | |
4808 | set_bit(CONN_WD_ST_CHG_OKAY, &tconn->flags); | |
4809 | } else { | |
4810 | set_bit(CONN_WD_ST_CHG_FAIL, &tconn->flags); | |
4811 | conn_err(tconn, "Requested state change failed by peer: %s (%d)\n", | |
4812 | drbd_set_st_err_str(retcode), retcode); | |
4813 | } | |
4814 | wake_up(&tconn->ping_wait); | |
4815 | ||
2735a594 | 4816 | return 0; |
e4f78ede PR |
4817 | } |
4818 | ||
1952e916 | 4819 | static int got_RqSReply(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4820 | { |
1952e916 | 4821 | struct drbd_conf *mdev; |
e658983a | 4822 | struct p_req_state_reply *p = pi->data; |
b411b363 PR |
4823 | int retcode = be32_to_cpu(p->retcode); |
4824 | ||
1952e916 AG |
4825 | mdev = vnr_to_mdev(tconn, pi->vnr); |
4826 | if (!mdev) | |
2735a594 | 4827 | return -EIO; |
1952e916 | 4828 | |
4d0fc3fd PR |
4829 | if (test_bit(CONN_WD_ST_CHG_REQ, &tconn->flags)) { |
4830 | D_ASSERT(tconn->agreed_pro_version < 100); | |
4831 | return got_conn_RqSReply(tconn, pi); | |
4832 | } | |
4833 | ||
e4f78ede PR |
4834 | if (retcode >= SS_SUCCESS) { |
4835 | set_bit(CL_ST_CHG_SUCCESS, &mdev->flags); | |
4836 | } else { | |
4837 | set_bit(CL_ST_CHG_FAIL, &mdev->flags); | |
4838 | dev_err(DEV, "Requested state change failed by peer: %s (%d)\n", | |
4839 | drbd_set_st_err_str(retcode), retcode); | |
b411b363 | 4840 | } |
e4f78ede PR |
4841 | wake_up(&mdev->state_wait); |
4842 | ||
2735a594 | 4843 | return 0; |
b411b363 PR |
4844 | } |
4845 | ||
e05e1e59 | 4846 | static int got_Ping(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4847 | { |
2735a594 | 4848 | return drbd_send_ping_ack(tconn); |
b411b363 PR |
4849 | |
4850 | } | |
4851 | ||
e05e1e59 | 4852 | static int got_PingAck(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 PR |
4853 | { |
4854 | /* restore idle timeout */ | |
2a67d8b9 PR |
4855 | tconn->meta.socket->sk->sk_rcvtimeo = tconn->net_conf->ping_int*HZ; |
4856 | if (!test_and_set_bit(GOT_PING_ACK, &tconn->flags)) | |
4857 | wake_up(&tconn->ping_wait); | |
b411b363 | 4858 | |
2735a594 | 4859 | return 0; |
b411b363 PR |
4860 | } |
4861 | ||
1952e916 | 4862 | static int got_IsInSync(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4863 | { |
1952e916 | 4864 | struct drbd_conf *mdev; |
e658983a | 4865 | struct p_block_ack *p = pi->data; |
b411b363 PR |
4866 | sector_t sector = be64_to_cpu(p->sector); |
4867 | int blksize = be32_to_cpu(p->blksize); | |
4868 | ||
1952e916 AG |
4869 | mdev = vnr_to_mdev(tconn, pi->vnr); |
4870 | if (!mdev) | |
2735a594 | 4871 | return -EIO; |
1952e916 | 4872 | |
31890f4a | 4873 | D_ASSERT(mdev->tconn->agreed_pro_version >= 89); |
b411b363 PR |
4874 | |
4875 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
4876 | ||
1d53f09e LE |
4877 | if (get_ldev(mdev)) { |
4878 | drbd_rs_complete_io(mdev, sector); | |
4879 | drbd_set_in_sync(mdev, sector, blksize); | |
4880 | /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ | |
4881 | mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); | |
4882 | put_ldev(mdev); | |
4883 | } | |
b411b363 | 4884 | dec_rs_pending(mdev); |
778f271d | 4885 | atomic_add(blksize >> 9, &mdev->rs_sect_in); |
b411b363 | 4886 | |
2735a594 | 4887 | return 0; |
b411b363 PR |
4888 | } |
4889 | ||
bc9c5c41 AG |
4890 | static int |
4891 | validate_req_change_req_state(struct drbd_conf *mdev, u64 id, sector_t sector, | |
4892 | struct rb_root *root, const char *func, | |
4893 | enum drbd_req_event what, bool missing_ok) | |
b411b363 PR |
4894 | { |
4895 | struct drbd_request *req; | |
4896 | struct bio_and_error m; | |
4897 | ||
87eeee41 | 4898 | spin_lock_irq(&mdev->tconn->req_lock); |
bc9c5c41 | 4899 | req = find_request(mdev, root, id, sector, missing_ok, func); |
b411b363 | 4900 | if (unlikely(!req)) { |
87eeee41 | 4901 | spin_unlock_irq(&mdev->tconn->req_lock); |
85997675 | 4902 | return -EIO; |
b411b363 PR |
4903 | } |
4904 | __req_mod(req, what, &m); | |
87eeee41 | 4905 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
4906 | |
4907 | if (m.bio) | |
4908 | complete_master_bio(mdev, &m); | |
85997675 | 4909 | return 0; |
b411b363 PR |
4910 | } |
4911 | ||
1952e916 | 4912 | static int got_BlockAck(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4913 | { |
1952e916 | 4914 | struct drbd_conf *mdev; |
e658983a | 4915 | struct p_block_ack *p = pi->data; |
b411b363 PR |
4916 | sector_t sector = be64_to_cpu(p->sector); |
4917 | int blksize = be32_to_cpu(p->blksize); | |
4918 | enum drbd_req_event what; | |
4919 | ||
1952e916 AG |
4920 | mdev = vnr_to_mdev(tconn, pi->vnr); |
4921 | if (!mdev) | |
2735a594 | 4922 | return -EIO; |
1952e916 | 4923 | |
b411b363 PR |
4924 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); |
4925 | ||
579b57ed | 4926 | if (p->block_id == ID_SYNCER) { |
b411b363 PR |
4927 | drbd_set_in_sync(mdev, sector, blksize); |
4928 | dec_rs_pending(mdev); | |
2735a594 | 4929 | return 0; |
b411b363 | 4930 | } |
e05e1e59 | 4931 | switch (pi->cmd) { |
b411b363 | 4932 | case P_RS_WRITE_ACK: |
8554df1c | 4933 | what = WRITE_ACKED_BY_PEER_AND_SIS; |
b411b363 PR |
4934 | break; |
4935 | case P_WRITE_ACK: | |
8554df1c | 4936 | what = WRITE_ACKED_BY_PEER; |
b411b363 PR |
4937 | break; |
4938 | case P_RECV_ACK: | |
8554df1c | 4939 | what = RECV_ACKED_BY_PEER; |
b411b363 | 4940 | break; |
7be8da07 | 4941 | case P_DISCARD_WRITE: |
7be8da07 AG |
4942 | what = DISCARD_WRITE; |
4943 | break; | |
4944 | case P_RETRY_WRITE: | |
7be8da07 | 4945 | what = POSTPONE_WRITE; |
b411b363 PR |
4946 | break; |
4947 | default: | |
2735a594 | 4948 | BUG(); |
b411b363 PR |
4949 | } |
4950 | ||
2735a594 AG |
4951 | return validate_req_change_req_state(mdev, p->block_id, sector, |
4952 | &mdev->write_requests, __func__, | |
4953 | what, false); | |
b411b363 PR |
4954 | } |
4955 | ||
1952e916 | 4956 | static int got_NegAck(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4957 | { |
1952e916 | 4958 | struct drbd_conf *mdev; |
e658983a | 4959 | struct p_block_ack *p = pi->data; |
b411b363 | 4960 | sector_t sector = be64_to_cpu(p->sector); |
2deb8336 | 4961 | int size = be32_to_cpu(p->blksize); |
85997675 | 4962 | int err; |
b411b363 | 4963 | |
1952e916 AG |
4964 | mdev = vnr_to_mdev(tconn, pi->vnr); |
4965 | if (!mdev) | |
2735a594 | 4966 | return -EIO; |
1952e916 | 4967 | |
b411b363 PR |
4968 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); |
4969 | ||
579b57ed | 4970 | if (p->block_id == ID_SYNCER) { |
b411b363 PR |
4971 | dec_rs_pending(mdev); |
4972 | drbd_rs_failed_io(mdev, sector, size); | |
2735a594 | 4973 | return 0; |
b411b363 | 4974 | } |
2deb8336 | 4975 | |
85997675 AG |
4976 | err = validate_req_change_req_state(mdev, p->block_id, sector, |
4977 | &mdev->write_requests, __func__, | |
303d1448 | 4978 | NEG_ACKED, true); |
85997675 | 4979 | if (err) { |
c3afd8f5 AG |
4980 | /* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs. |
4981 | The master bio might already be completed, therefore the | |
4982 | request is no longer in the collision hash. */ | |
4983 | /* In Protocol B we might already have got a P_RECV_ACK | |
4984 | but then get a P_NEG_ACK afterwards. */ | |
c3afd8f5 | 4985 | drbd_set_out_of_sync(mdev, sector, size); |
2deb8336 | 4986 | } |
2735a594 | 4987 | return 0; |
b411b363 PR |
4988 | } |
4989 | ||
1952e916 | 4990 | static int got_NegDReply(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4991 | { |
1952e916 | 4992 | struct drbd_conf *mdev; |
e658983a | 4993 | struct p_block_ack *p = pi->data; |
b411b363 PR |
4994 | sector_t sector = be64_to_cpu(p->sector); |
4995 | ||
1952e916 AG |
4996 | mdev = vnr_to_mdev(tconn, pi->vnr); |
4997 | if (!mdev) | |
2735a594 | 4998 | return -EIO; |
1952e916 | 4999 | |
b411b363 | 5000 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); |
7be8da07 | 5001 | |
380207d0 | 5002 | dev_err(DEV, "Got NegDReply; Sector %llus, len %u.\n", |
b411b363 PR |
5003 | (unsigned long long)sector, be32_to_cpu(p->blksize)); |
5004 | ||
2735a594 AG |
5005 | return validate_req_change_req_state(mdev, p->block_id, sector, |
5006 | &mdev->read_requests, __func__, | |
5007 | NEG_ACKED, false); | |
b411b363 PR |
5008 | } |
5009 | ||
1952e916 | 5010 | static int got_NegRSDReply(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 5011 | { |
1952e916 | 5012 | struct drbd_conf *mdev; |
b411b363 PR |
5013 | sector_t sector; |
5014 | int size; | |
e658983a | 5015 | struct p_block_ack *p = pi->data; |
1952e916 AG |
5016 | |
5017 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
5018 | if (!mdev) | |
2735a594 | 5019 | return -EIO; |
b411b363 PR |
5020 | |
5021 | sector = be64_to_cpu(p->sector); | |
5022 | size = be32_to_cpu(p->blksize); | |
b411b363 PR |
5023 | |
5024 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
5025 | ||
5026 | dec_rs_pending(mdev); | |
5027 | ||
5028 | if (get_ldev_if_state(mdev, D_FAILED)) { | |
5029 | drbd_rs_complete_io(mdev, sector); | |
e05e1e59 | 5030 | switch (pi->cmd) { |
d612d309 PR |
5031 | case P_NEG_RS_DREPLY: |
5032 | drbd_rs_failed_io(mdev, sector, size); | |
5033 | case P_RS_CANCEL: | |
5034 | break; | |
5035 | default: | |
2735a594 | 5036 | BUG(); |
d612d309 | 5037 | } |
b411b363 PR |
5038 | put_ldev(mdev); |
5039 | } | |
5040 | ||
2735a594 | 5041 | return 0; |
b411b363 PR |
5042 | } |
5043 | ||
1952e916 | 5044 | static int got_BarrierAck(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 5045 | { |
e658983a | 5046 | struct p_barrier_ack *p = pi->data; |
9ed57dcb LE |
5047 | struct drbd_conf *mdev; |
5048 | int vnr; | |
1952e916 | 5049 | |
9ed57dcb | 5050 | tl_release(tconn, p->barrier, be32_to_cpu(p->set_size)); |
b411b363 | 5051 | |
9ed57dcb LE |
5052 | rcu_read_lock(); |
5053 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { | |
5054 | if (mdev->state.conn == C_AHEAD && | |
5055 | atomic_read(&mdev->ap_in_flight) == 0 && | |
5056 | !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &mdev->flags)) { | |
5057 | mdev->start_resync_timer.expires = jiffies + HZ; | |
5058 | add_timer(&mdev->start_resync_timer); | |
5059 | } | |
c4752ef1 | 5060 | } |
9ed57dcb | 5061 | rcu_read_unlock(); |
c4752ef1 | 5062 | |
2735a594 | 5063 | return 0; |
b411b363 PR |
5064 | } |
5065 | ||
1952e916 | 5066 | static int got_OVResult(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 5067 | { |
1952e916 | 5068 | struct drbd_conf *mdev; |
e658983a | 5069 | struct p_block_ack *p = pi->data; |
b411b363 PR |
5070 | struct drbd_work *w; |
5071 | sector_t sector; | |
5072 | int size; | |
5073 | ||
1952e916 AG |
5074 | mdev = vnr_to_mdev(tconn, pi->vnr); |
5075 | if (!mdev) | |
2735a594 | 5076 | return -EIO; |
1952e916 | 5077 | |
b411b363 PR |
5078 | sector = be64_to_cpu(p->sector); |
5079 | size = be32_to_cpu(p->blksize); | |
5080 | ||
5081 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
5082 | ||
5083 | if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) | |
8f7bed77 | 5084 | drbd_ov_out_of_sync_found(mdev, sector, size); |
b411b363 | 5085 | else |
8f7bed77 | 5086 | ov_out_of_sync_print(mdev); |
b411b363 | 5087 | |
1d53f09e | 5088 | if (!get_ldev(mdev)) |
2735a594 | 5089 | return 0; |
1d53f09e | 5090 | |
b411b363 PR |
5091 | drbd_rs_complete_io(mdev, sector); |
5092 | dec_rs_pending(mdev); | |
5093 | ||
ea5442af LE |
5094 | --mdev->ov_left; |
5095 | ||
5096 | /* let's advance progress step marks only for every other megabyte */ | |
5097 | if ((mdev->ov_left & 0x200) == 0x200) | |
5098 | drbd_advance_rs_marks(mdev, mdev->ov_left); | |
5099 | ||
5100 | if (mdev->ov_left == 0) { | |
b411b363 PR |
5101 | w = kmalloc(sizeof(*w), GFP_NOIO); |
5102 | if (w) { | |
5103 | w->cb = w_ov_finished; | |
a21e9298 | 5104 | w->mdev = mdev; |
e42325a5 | 5105 | drbd_queue_work_front(&mdev->tconn->data.work, w); |
b411b363 PR |
5106 | } else { |
5107 | dev_err(DEV, "kmalloc(w) failed."); | |
8f7bed77 | 5108 | ov_out_of_sync_print(mdev); |
b411b363 PR |
5109 | drbd_resync_finished(mdev); |
5110 | } | |
5111 | } | |
1d53f09e | 5112 | put_ldev(mdev); |
2735a594 | 5113 | return 0; |
b411b363 PR |
5114 | } |
5115 | ||
1952e916 | 5116 | static int got_skip(struct drbd_tconn *tconn, struct packet_info *pi) |
0ced55a3 | 5117 | { |
2735a594 | 5118 | return 0; |
0ced55a3 PR |
5119 | } |
5120 | ||
a990be46 | 5121 | static int tconn_finish_peer_reqs(struct drbd_tconn *tconn) |
32862ec7 | 5122 | { |
082a3439 | 5123 | struct drbd_conf *mdev; |
c141ebda | 5124 | int vnr, not_empty = 0; |
32862ec7 PR |
5125 | |
5126 | do { | |
5127 | clear_bit(SIGNAL_ASENDER, &tconn->flags); | |
5128 | flush_signals(current); | |
c141ebda PR |
5129 | |
5130 | rcu_read_lock(); | |
5131 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { | |
5132 | kref_get(&mdev->kref); | |
5133 | rcu_read_unlock(); | |
d3fcb490 | 5134 | if (drbd_finish_peer_reqs(mdev)) { |
c141ebda PR |
5135 | kref_put(&mdev->kref, &drbd_minor_destroy); |
5136 | return 1; | |
d3fcb490 | 5137 | } |
c141ebda PR |
5138 | kref_put(&mdev->kref, &drbd_minor_destroy); |
5139 | rcu_read_lock(); | |
082a3439 | 5140 | } |
32862ec7 | 5141 | set_bit(SIGNAL_ASENDER, &tconn->flags); |
082a3439 PR |
5142 | |
5143 | spin_lock_irq(&tconn->req_lock); | |
c141ebda | 5144 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { |
082a3439 PR |
5145 | not_empty = !list_empty(&mdev->done_ee); |
5146 | if (not_empty) | |
5147 | break; | |
5148 | } | |
5149 | spin_unlock_irq(&tconn->req_lock); | |
c141ebda | 5150 | rcu_read_unlock(); |
32862ec7 PR |
5151 | } while (not_empty); |
5152 | ||
5153 | return 0; | |
5154 | } | |
5155 | ||
7201b972 AG |
5156 | struct asender_cmd { |
5157 | size_t pkt_size; | |
1952e916 | 5158 | int (*fn)(struct drbd_tconn *tconn, struct packet_info *); |
7201b972 AG |
5159 | }; |
5160 | ||
5161 | static struct asender_cmd asender_tbl[] = { | |
e658983a AG |
5162 | [P_PING] = { 0, got_Ping }, |
5163 | [P_PING_ACK] = { 0, got_PingAck }, | |
1952e916 AG |
5164 | [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, |
5165 | [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, | |
5166 | [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, | |
5167 | [P_DISCARD_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, | |
5168 | [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, | |
5169 | [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, | |
5170 | [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply }, | |
5171 | [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, | |
5172 | [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, | |
5173 | [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, | |
5174 | [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, | |
5175 | [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip }, | |
5176 | [P_RS_CANCEL] = { sizeof(struct p_block_ack), got_NegRSDReply }, | |
5177 | [P_CONN_ST_CHG_REPLY]={ sizeof(struct p_req_state_reply), got_conn_RqSReply }, | |
5178 | [P_RETRY_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, | |
7201b972 AG |
5179 | }; |
5180 | ||
b411b363 PR |
5181 | int drbd_asender(struct drbd_thread *thi) |
5182 | { | |
392c8801 | 5183 | struct drbd_tconn *tconn = thi->tconn; |
b411b363 | 5184 | struct asender_cmd *cmd = NULL; |
77351055 | 5185 | struct packet_info pi; |
257d0af6 | 5186 | int rv; |
e658983a | 5187 | void *buf = tconn->meta.rbuf; |
b411b363 | 5188 | int received = 0; |
52b061a4 AG |
5189 | unsigned int header_size = drbd_header_size(tconn); |
5190 | int expect = header_size; | |
44ed167d PR |
5191 | bool ping_timeout_active = false; |
5192 | struct net_conf *nc; | |
bb77d34e | 5193 | int ping_timeo, tcp_cork, ping_int; |
b411b363 | 5194 | |
b411b363 PR |
5195 | current->policy = SCHED_RR; /* Make this a realtime task! */ |
5196 | current->rt_priority = 2; /* more important than all other tasks */ | |
5197 | ||
e77a0a5c | 5198 | while (get_t_state(thi) == RUNNING) { |
80822284 | 5199 | drbd_thread_current_set_cpu(thi); |
44ed167d PR |
5200 | |
5201 | rcu_read_lock(); | |
5202 | nc = rcu_dereference(tconn->net_conf); | |
5203 | ping_timeo = nc->ping_timeo; | |
bb77d34e | 5204 | tcp_cork = nc->tcp_cork; |
44ed167d PR |
5205 | ping_int = nc->ping_int; |
5206 | rcu_read_unlock(); | |
5207 | ||
32862ec7 | 5208 | if (test_and_clear_bit(SEND_PING, &tconn->flags)) { |
a17647aa | 5209 | if (drbd_send_ping(tconn)) { |
32862ec7 | 5210 | conn_err(tconn, "drbd_send_ping has failed\n"); |
841ce241 AG |
5211 | goto reconnect; |
5212 | } | |
44ed167d PR |
5213 | tconn->meta.socket->sk->sk_rcvtimeo = ping_timeo * HZ / 10; |
5214 | ping_timeout_active = true; | |
b411b363 PR |
5215 | } |
5216 | ||
32862ec7 PR |
5217 | /* TODO: conditionally cork; it may hurt latency if we cork without |
5218 | much to send */ | |
bb77d34e | 5219 | if (tcp_cork) |
32862ec7 | 5220 | drbd_tcp_cork(tconn->meta.socket); |
a990be46 AG |
5221 | if (tconn_finish_peer_reqs(tconn)) { |
5222 | conn_err(tconn, "tconn_finish_peer_reqs() failed\n"); | |
32862ec7 | 5223 | goto reconnect; |
082a3439 | 5224 | } |
b411b363 | 5225 | /* but unconditionally uncork unless disabled */ |
bb77d34e | 5226 | if (tcp_cork) |
32862ec7 | 5227 | drbd_tcp_uncork(tconn->meta.socket); |
b411b363 PR |
5228 | |
5229 | /* short circuit, recv_msg would return EINTR anyways. */ | |
5230 | if (signal_pending(current)) | |
5231 | continue; | |
5232 | ||
32862ec7 PR |
5233 | rv = drbd_recv_short(tconn->meta.socket, buf, expect-received, 0); |
5234 | clear_bit(SIGNAL_ASENDER, &tconn->flags); | |
b411b363 PR |
5235 | |
5236 | flush_signals(current); | |
5237 | ||
5238 | /* Note: | |
5239 | * -EINTR (on meta) we got a signal | |
5240 | * -EAGAIN (on meta) rcvtimeo expired | |
5241 | * -ECONNRESET other side closed the connection | |
5242 | * -ERESTARTSYS (on data) we got a signal | |
5243 | * rv < 0 other than above: unexpected error! | |
5244 | * rv == expected: full header or command | |
5245 | * rv < expected: "woken" by signal during receive | |
5246 | * rv == 0 : "connection shut down by peer" | |
5247 | */ | |
5248 | if (likely(rv > 0)) { | |
5249 | received += rv; | |
5250 | buf += rv; | |
5251 | } else if (rv == 0) { | |
32862ec7 | 5252 | conn_err(tconn, "meta connection shut down by peer.\n"); |
b411b363 PR |
5253 | goto reconnect; |
5254 | } else if (rv == -EAGAIN) { | |
cb6518cb LE |
5255 | /* If the data socket received something meanwhile, |
5256 | * that is good enough: peer is still alive. */ | |
32862ec7 PR |
5257 | if (time_after(tconn->last_received, |
5258 | jiffies - tconn->meta.socket->sk->sk_rcvtimeo)) | |
cb6518cb | 5259 | continue; |
f36af18c | 5260 | if (ping_timeout_active) { |
32862ec7 | 5261 | conn_err(tconn, "PingAck did not arrive in time.\n"); |
b411b363 PR |
5262 | goto reconnect; |
5263 | } | |
32862ec7 | 5264 | set_bit(SEND_PING, &tconn->flags); |
b411b363 PR |
5265 | continue; |
5266 | } else if (rv == -EINTR) { | |
5267 | continue; | |
5268 | } else { | |
32862ec7 | 5269 | conn_err(tconn, "sock_recvmsg returned %d\n", rv); |
b411b363 PR |
5270 | goto reconnect; |
5271 | } | |
5272 | ||
5273 | if (received == expect && cmd == NULL) { | |
e658983a | 5274 | if (decode_header(tconn, tconn->meta.rbuf, &pi)) |
b411b363 | 5275 | goto reconnect; |
7201b972 | 5276 | cmd = &asender_tbl[pi.cmd]; |
1952e916 | 5277 | if (pi.cmd >= ARRAY_SIZE(asender_tbl) || !cmd->fn) { |
2fcb8f30 AG |
5278 | conn_err(tconn, "Unexpected meta packet %s (0x%04x)\n", |
5279 | cmdname(pi.cmd), pi.cmd); | |
b411b363 PR |
5280 | goto disconnect; |
5281 | } | |
e658983a | 5282 | expect = header_size + cmd->pkt_size; |
52b061a4 | 5283 | if (pi.size != expect - header_size) { |
32862ec7 | 5284 | conn_err(tconn, "Wrong packet size on meta (c: %d, l: %d)\n", |
77351055 | 5285 | pi.cmd, pi.size); |
b411b363 | 5286 | goto reconnect; |
257d0af6 | 5287 | } |
b411b363 PR |
5288 | } |
5289 | if (received == expect) { | |
2735a594 | 5290 | bool err; |
a4fbda8e | 5291 | |
2735a594 AG |
5292 | err = cmd->fn(tconn, &pi); |
5293 | if (err) { | |
1952e916 | 5294 | conn_err(tconn, "%pf failed\n", cmd->fn); |
b411b363 | 5295 | goto reconnect; |
1952e916 | 5296 | } |
b411b363 | 5297 | |
a4fbda8e PR |
5298 | tconn->last_received = jiffies; |
5299 | ||
44ed167d PR |
5300 | if (cmd == &asender_tbl[P_PING_ACK]) { |
5301 | /* restore idle timeout */ | |
5302 | tconn->meta.socket->sk->sk_rcvtimeo = ping_int * HZ; | |
5303 | ping_timeout_active = false; | |
5304 | } | |
f36af18c | 5305 | |
e658983a | 5306 | buf = tconn->meta.rbuf; |
b411b363 | 5307 | received = 0; |
52b061a4 | 5308 | expect = header_size; |
b411b363 PR |
5309 | cmd = NULL; |
5310 | } | |
5311 | } | |
5312 | ||
5313 | if (0) { | |
5314 | reconnect: | |
bbeb641c | 5315 | conn_request_state(tconn, NS(conn, C_NETWORK_FAILURE), CS_HARD); |
b411b363 PR |
5316 | } |
5317 | if (0) { | |
5318 | disconnect: | |
bbeb641c | 5319 | conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 | 5320 | } |
32862ec7 | 5321 | clear_bit(SIGNAL_ASENDER, &tconn->flags); |
b411b363 | 5322 | |
32862ec7 | 5323 | conn_info(tconn, "asender terminated\n"); |
b411b363 PR |
5324 | |
5325 | return 0; | |
5326 | } |