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; | |
490 | ||
491 | out: | |
492 | return err; | |
493 | } | |
494 | ||
dbd9eea0 | 495 | static int drbd_recv_short(struct socket *sock, void *buf, size_t size, int flags) |
b411b363 PR |
496 | { |
497 | mm_segment_t oldfs; | |
498 | struct kvec iov = { | |
499 | .iov_base = buf, | |
500 | .iov_len = size, | |
501 | }; | |
502 | struct msghdr msg = { | |
503 | .msg_iovlen = 1, | |
504 | .msg_iov = (struct iovec *)&iov, | |
505 | .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) | |
506 | }; | |
507 | int rv; | |
508 | ||
509 | oldfs = get_fs(); | |
510 | set_fs(KERNEL_DS); | |
511 | rv = sock_recvmsg(sock, &msg, size, msg.msg_flags); | |
512 | set_fs(oldfs); | |
513 | ||
514 | return rv; | |
515 | } | |
516 | ||
de0ff338 | 517 | static int drbd_recv(struct drbd_tconn *tconn, void *buf, size_t size) |
b411b363 PR |
518 | { |
519 | mm_segment_t oldfs; | |
520 | struct kvec iov = { | |
521 | .iov_base = buf, | |
522 | .iov_len = size, | |
523 | }; | |
524 | struct msghdr msg = { | |
525 | .msg_iovlen = 1, | |
526 | .msg_iov = (struct iovec *)&iov, | |
527 | .msg_flags = MSG_WAITALL | MSG_NOSIGNAL | |
528 | }; | |
529 | int rv; | |
530 | ||
531 | oldfs = get_fs(); | |
532 | set_fs(KERNEL_DS); | |
533 | ||
534 | for (;;) { | |
de0ff338 | 535 | rv = sock_recvmsg(tconn->data.socket, &msg, size, msg.msg_flags); |
b411b363 PR |
536 | if (rv == size) |
537 | break; | |
538 | ||
539 | /* Note: | |
540 | * ECONNRESET other side closed the connection | |
541 | * ERESTARTSYS (on sock) we got a signal | |
542 | */ | |
543 | ||
544 | if (rv < 0) { | |
545 | if (rv == -ECONNRESET) | |
de0ff338 | 546 | conn_info(tconn, "sock was reset by peer\n"); |
b411b363 | 547 | else if (rv != -ERESTARTSYS) |
de0ff338 | 548 | conn_err(tconn, "sock_recvmsg returned %d\n", rv); |
b411b363 PR |
549 | break; |
550 | } else if (rv == 0) { | |
de0ff338 | 551 | conn_info(tconn, "sock was shut down by peer\n"); |
b411b363 PR |
552 | break; |
553 | } else { | |
554 | /* signal came in, or peer/link went down, | |
555 | * after we read a partial message | |
556 | */ | |
557 | /* D_ASSERT(signal_pending(current)); */ | |
558 | break; | |
559 | } | |
560 | }; | |
561 | ||
562 | set_fs(oldfs); | |
563 | ||
564 | if (rv != size) | |
bbeb641c | 565 | conn_request_state(tconn, NS(conn, C_BROKEN_PIPE), CS_HARD); |
b411b363 PR |
566 | |
567 | return rv; | |
568 | } | |
569 | ||
c6967746 AG |
570 | static int drbd_recv_all(struct drbd_tconn *tconn, void *buf, size_t size) |
571 | { | |
572 | int err; | |
573 | ||
574 | err = drbd_recv(tconn, buf, size); | |
575 | if (err != size) { | |
576 | if (err >= 0) | |
577 | err = -EIO; | |
578 | } else | |
579 | err = 0; | |
580 | return err; | |
581 | } | |
582 | ||
a5c31904 AG |
583 | static int drbd_recv_all_warn(struct drbd_tconn *tconn, void *buf, size_t size) |
584 | { | |
585 | int err; | |
586 | ||
587 | err = drbd_recv_all(tconn, buf, size); | |
588 | if (err && !signal_pending(current)) | |
589 | conn_warn(tconn, "short read (expected size %d)\n", (int)size); | |
590 | return err; | |
591 | } | |
592 | ||
5dbf1673 LE |
593 | /* quoting tcp(7): |
594 | * On individual connections, the socket buffer size must be set prior to the | |
595 | * listen(2) or connect(2) calls in order to have it take effect. | |
596 | * This is our wrapper to do so. | |
597 | */ | |
598 | static void drbd_setbufsize(struct socket *sock, unsigned int snd, | |
599 | unsigned int rcv) | |
600 | { | |
601 | /* open coded SO_SNDBUF, SO_RCVBUF */ | |
602 | if (snd) { | |
603 | sock->sk->sk_sndbuf = snd; | |
604 | sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; | |
605 | } | |
606 | if (rcv) { | |
607 | sock->sk->sk_rcvbuf = rcv; | |
608 | sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; | |
609 | } | |
610 | } | |
611 | ||
eac3e990 | 612 | static struct socket *drbd_try_connect(struct drbd_tconn *tconn) |
b411b363 PR |
613 | { |
614 | const char *what; | |
615 | struct socket *sock; | |
616 | struct sockaddr_in6 src_in6; | |
44ed167d PR |
617 | struct sockaddr_in6 peer_in6; |
618 | struct net_conf *nc; | |
619 | int err, peer_addr_len, my_addr_len; | |
69ef82de | 620 | int sndbuf_size, rcvbuf_size, connect_int; |
b411b363 PR |
621 | int disconnect_on_error = 1; |
622 | ||
44ed167d PR |
623 | rcu_read_lock(); |
624 | nc = rcu_dereference(tconn->net_conf); | |
625 | if (!nc) { | |
626 | rcu_read_unlock(); | |
b411b363 | 627 | return NULL; |
44ed167d | 628 | } |
44ed167d PR |
629 | sndbuf_size = nc->sndbuf_size; |
630 | rcvbuf_size = nc->rcvbuf_size; | |
69ef82de | 631 | connect_int = nc->connect_int; |
089c075d | 632 | rcu_read_unlock(); |
44ed167d | 633 | |
089c075d AG |
634 | my_addr_len = min_t(int, tconn->my_addr_len, sizeof(src_in6)); |
635 | memcpy(&src_in6, &tconn->my_addr, my_addr_len); | |
44ed167d | 636 | |
089c075d | 637 | if (((struct sockaddr *)&tconn->my_addr)->sa_family == AF_INET6) |
44ed167d PR |
638 | src_in6.sin6_port = 0; |
639 | else | |
640 | ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ | |
641 | ||
089c075d AG |
642 | peer_addr_len = min_t(int, tconn->peer_addr_len, sizeof(src_in6)); |
643 | memcpy(&peer_in6, &tconn->peer_addr, peer_addr_len); | |
b411b363 PR |
644 | |
645 | what = "sock_create_kern"; | |
44ed167d PR |
646 | err = sock_create_kern(((struct sockaddr *)&src_in6)->sa_family, |
647 | SOCK_STREAM, IPPROTO_TCP, &sock); | |
b411b363 PR |
648 | if (err < 0) { |
649 | sock = NULL; | |
650 | goto out; | |
651 | } | |
652 | ||
653 | sock->sk->sk_rcvtimeo = | |
69ef82de | 654 | sock->sk->sk_sndtimeo = connect_int * HZ; |
44ed167d | 655 | drbd_setbufsize(sock, sndbuf_size, rcvbuf_size); |
b411b363 PR |
656 | |
657 | /* explicitly bind to the configured IP as source IP | |
658 | * for the outgoing connections. | |
659 | * This is needed for multihomed hosts and to be | |
660 | * able to use lo: interfaces for drbd. | |
661 | * Make sure to use 0 as port number, so linux selects | |
662 | * a free one dynamically. | |
663 | */ | |
b411b363 | 664 | what = "bind before connect"; |
44ed167d | 665 | err = sock->ops->bind(sock, (struct sockaddr *) &src_in6, my_addr_len); |
b411b363 PR |
666 | if (err < 0) |
667 | goto out; | |
668 | ||
669 | /* connect may fail, peer not yet available. | |
670 | * stay C_WF_CONNECTION, don't go Disconnecting! */ | |
671 | disconnect_on_error = 0; | |
672 | what = "connect"; | |
44ed167d | 673 | err = sock->ops->connect(sock, (struct sockaddr *) &peer_in6, peer_addr_len, 0); |
b411b363 PR |
674 | |
675 | out: | |
676 | if (err < 0) { | |
677 | if (sock) { | |
678 | sock_release(sock); | |
679 | sock = NULL; | |
680 | } | |
681 | switch (-err) { | |
682 | /* timeout, busy, signal pending */ | |
683 | case ETIMEDOUT: case EAGAIN: case EINPROGRESS: | |
684 | case EINTR: case ERESTARTSYS: | |
685 | /* peer not (yet) available, network problem */ | |
686 | case ECONNREFUSED: case ENETUNREACH: | |
687 | case EHOSTDOWN: case EHOSTUNREACH: | |
688 | disconnect_on_error = 0; | |
689 | break; | |
690 | default: | |
eac3e990 | 691 | conn_err(tconn, "%s failed, err = %d\n", what, err); |
b411b363 PR |
692 | } |
693 | if (disconnect_on_error) | |
bbeb641c | 694 | conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 | 695 | } |
44ed167d | 696 | |
b411b363 PR |
697 | return sock; |
698 | } | |
699 | ||
7653620d | 700 | static struct socket *drbd_wait_for_connect(struct drbd_tconn *tconn) |
b411b363 | 701 | { |
44ed167d | 702 | int timeo, err, my_addr_len; |
69ef82de | 703 | int sndbuf_size, rcvbuf_size, connect_int; |
b411b363 | 704 | struct socket *s_estab = NULL, *s_listen; |
44ed167d PR |
705 | struct sockaddr_in6 my_addr; |
706 | struct net_conf *nc; | |
b411b363 PR |
707 | const char *what; |
708 | ||
44ed167d PR |
709 | rcu_read_lock(); |
710 | nc = rcu_dereference(tconn->net_conf); | |
711 | if (!nc) { | |
712 | rcu_read_unlock(); | |
b411b363 | 713 | return NULL; |
44ed167d | 714 | } |
44ed167d PR |
715 | sndbuf_size = nc->sndbuf_size; |
716 | rcvbuf_size = nc->rcvbuf_size; | |
69ef82de | 717 | connect_int = nc->connect_int; |
44ed167d | 718 | rcu_read_unlock(); |
b411b363 | 719 | |
089c075d AG |
720 | my_addr_len = min_t(int, tconn->my_addr_len, sizeof(struct sockaddr_in6)); |
721 | memcpy(&my_addr, &tconn->my_addr, my_addr_len); | |
722 | ||
b411b363 | 723 | what = "sock_create_kern"; |
44ed167d | 724 | err = sock_create_kern(((struct sockaddr *)&my_addr)->sa_family, |
b411b363 PR |
725 | SOCK_STREAM, IPPROTO_TCP, &s_listen); |
726 | if (err) { | |
727 | s_listen = NULL; | |
728 | goto out; | |
729 | } | |
730 | ||
69ef82de | 731 | timeo = connect_int * HZ; |
b411b363 PR |
732 | timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */ |
733 | ||
734 | s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */ | |
735 | s_listen->sk->sk_rcvtimeo = timeo; | |
736 | s_listen->sk->sk_sndtimeo = timeo; | |
44ed167d | 737 | drbd_setbufsize(s_listen, sndbuf_size, rcvbuf_size); |
b411b363 PR |
738 | |
739 | what = "bind before listen"; | |
44ed167d | 740 | err = s_listen->ops->bind(s_listen, (struct sockaddr *)&my_addr, my_addr_len); |
b411b363 PR |
741 | if (err < 0) |
742 | goto out; | |
743 | ||
7653620d | 744 | err = drbd_accept(&what, s_listen, &s_estab); |
b411b363 PR |
745 | |
746 | out: | |
747 | if (s_listen) | |
748 | sock_release(s_listen); | |
749 | if (err < 0) { | |
750 | if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { | |
7653620d | 751 | conn_err(tconn, "%s failed, err = %d\n", what, err); |
bbeb641c | 752 | conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 PR |
753 | } |
754 | } | |
b411b363 PR |
755 | |
756 | return s_estab; | |
757 | } | |
758 | ||
e658983a | 759 | static int decode_header(struct drbd_tconn *, void *, struct packet_info *); |
b411b363 | 760 | |
9f5bdc33 AG |
761 | static int send_first_packet(struct drbd_tconn *tconn, struct drbd_socket *sock, |
762 | enum drbd_packet cmd) | |
763 | { | |
764 | if (!conn_prepare_command(tconn, sock)) | |
765 | return -EIO; | |
e658983a | 766 | return conn_send_command(tconn, sock, cmd, 0, NULL, 0); |
b411b363 PR |
767 | } |
768 | ||
9f5bdc33 | 769 | static int receive_first_packet(struct drbd_tconn *tconn, struct socket *sock) |
b411b363 | 770 | { |
9f5bdc33 AG |
771 | unsigned int header_size = drbd_header_size(tconn); |
772 | struct packet_info pi; | |
773 | int err; | |
b411b363 | 774 | |
9f5bdc33 AG |
775 | err = drbd_recv_short(sock, tconn->data.rbuf, header_size, 0); |
776 | if (err != header_size) { | |
777 | if (err >= 0) | |
778 | err = -EIO; | |
779 | return err; | |
780 | } | |
781 | err = decode_header(tconn, tconn->data.rbuf, &pi); | |
782 | if (err) | |
783 | return err; | |
784 | return pi.cmd; | |
b411b363 PR |
785 | } |
786 | ||
787 | /** | |
788 | * drbd_socket_okay() - Free the socket if its connection is not okay | |
b411b363 PR |
789 | * @sock: pointer to the pointer to the socket. |
790 | */ | |
dbd9eea0 | 791 | static int drbd_socket_okay(struct socket **sock) |
b411b363 PR |
792 | { |
793 | int rr; | |
794 | char tb[4]; | |
795 | ||
796 | if (!*sock) | |
81e84650 | 797 | return false; |
b411b363 | 798 | |
dbd9eea0 | 799 | rr = drbd_recv_short(*sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); |
b411b363 PR |
800 | |
801 | if (rr > 0 || rr == -EAGAIN) { | |
81e84650 | 802 | return true; |
b411b363 PR |
803 | } else { |
804 | sock_release(*sock); | |
805 | *sock = NULL; | |
81e84650 | 806 | return false; |
b411b363 PR |
807 | } |
808 | } | |
2325eb66 PR |
809 | /* Gets called if a connection is established, or if a new minor gets created |
810 | in a connection */ | |
c141ebda | 811 | int drbd_connected(struct drbd_conf *mdev) |
907599e0 | 812 | { |
0829f5ed | 813 | int err; |
907599e0 PR |
814 | |
815 | atomic_set(&mdev->packet_seq, 0); | |
816 | mdev->peer_seq = 0; | |
817 | ||
8410da8f PR |
818 | mdev->state_mutex = mdev->tconn->agreed_pro_version < 100 ? |
819 | &mdev->tconn->cstate_mutex : | |
820 | &mdev->own_state_mutex; | |
821 | ||
0829f5ed AG |
822 | err = drbd_send_sync_param(mdev); |
823 | if (!err) | |
824 | err = drbd_send_sizes(mdev, 0, 0); | |
825 | if (!err) | |
826 | err = drbd_send_uuids(mdev); | |
827 | if (!err) | |
43de7c85 | 828 | err = drbd_send_current_state(mdev); |
907599e0 PR |
829 | clear_bit(USE_DEGR_WFC_T, &mdev->flags); |
830 | clear_bit(RESIZE_PENDING, &mdev->flags); | |
8b924f1d | 831 | mod_timer(&mdev->request_timer, jiffies + HZ); /* just start it here. */ |
0829f5ed | 832 | return err; |
907599e0 PR |
833 | } |
834 | ||
b411b363 PR |
835 | /* |
836 | * return values: | |
837 | * 1 yes, we have a valid connection | |
838 | * 0 oops, did not work out, please try again | |
839 | * -1 peer talks different language, | |
840 | * no point in trying again, please go standalone. | |
841 | * -2 We do not have a network config... | |
842 | */ | |
81fa2e67 | 843 | static int conn_connect(struct drbd_tconn *tconn) |
b411b363 | 844 | { |
2bf89621 | 845 | struct socket *sock, *msock; |
c141ebda | 846 | struct drbd_conf *mdev; |
44ed167d | 847 | struct net_conf *nc; |
c141ebda | 848 | int vnr, timeout, try, h, ok; |
08b165ba | 849 | bool discard_my_data; |
b411b363 | 850 | |
bbeb641c | 851 | if (conn_request_state(tconn, NS(conn, C_WF_CONNECTION), CS_VERBOSE) < SS_SUCCESS) |
b411b363 PR |
852 | return -2; |
853 | ||
907599e0 | 854 | clear_bit(DISCARD_CONCURRENT, &tconn->flags); |
0916e0e3 AG |
855 | |
856 | /* Assume that the peer only understands protocol 80 until we know better. */ | |
857 | tconn->agreed_pro_version = 80; | |
b411b363 | 858 | |
b411b363 | 859 | do { |
2bf89621 AG |
860 | struct socket *s; |
861 | ||
b411b363 PR |
862 | for (try = 0;;) { |
863 | /* 3 tries, this should take less than a second! */ | |
907599e0 | 864 | s = drbd_try_connect(tconn); |
b411b363 PR |
865 | if (s || ++try >= 3) |
866 | break; | |
867 | /* give the other side time to call bind() & listen() */ | |
20ee6390 | 868 | schedule_timeout_interruptible(HZ / 10); |
b411b363 PR |
869 | } |
870 | ||
871 | if (s) { | |
2bf89621 AG |
872 | if (!tconn->data.socket) { |
873 | tconn->data.socket = s; | |
9f5bdc33 | 874 | send_first_packet(tconn, &tconn->data, P_INITIAL_DATA); |
2bf89621 AG |
875 | } else if (!tconn->meta.socket) { |
876 | tconn->meta.socket = s; | |
9f5bdc33 | 877 | send_first_packet(tconn, &tconn->meta, P_INITIAL_META); |
b411b363 | 878 | } else { |
81fa2e67 | 879 | conn_err(tconn, "Logic error in conn_connect()\n"); |
b411b363 PR |
880 | goto out_release_sockets; |
881 | } | |
882 | } | |
883 | ||
2bf89621 | 884 | if (tconn->data.socket && tconn->meta.socket) { |
907599e0 | 885 | schedule_timeout_interruptible(tconn->net_conf->ping_timeo*HZ/10); |
2bf89621 AG |
886 | ok = drbd_socket_okay(&tconn->data.socket); |
887 | ok = drbd_socket_okay(&tconn->meta.socket) && ok; | |
b411b363 PR |
888 | if (ok) |
889 | break; | |
890 | } | |
891 | ||
892 | retry: | |
907599e0 | 893 | s = drbd_wait_for_connect(tconn); |
b411b363 | 894 | if (s) { |
9f5bdc33 | 895 | try = receive_first_packet(tconn, s); |
2bf89621 AG |
896 | drbd_socket_okay(&tconn->data.socket); |
897 | drbd_socket_okay(&tconn->meta.socket); | |
b411b363 | 898 | switch (try) { |
e5d6f33a | 899 | case P_INITIAL_DATA: |
2bf89621 | 900 | if (tconn->data.socket) { |
907599e0 | 901 | conn_warn(tconn, "initial packet S crossed\n"); |
2bf89621 | 902 | sock_release(tconn->data.socket); |
b411b363 | 903 | } |
2bf89621 | 904 | tconn->data.socket = s; |
b411b363 | 905 | break; |
e5d6f33a | 906 | case P_INITIAL_META: |
2bf89621 | 907 | if (tconn->meta.socket) { |
907599e0 | 908 | conn_warn(tconn, "initial packet M crossed\n"); |
2bf89621 | 909 | sock_release(tconn->meta.socket); |
b411b363 | 910 | } |
2bf89621 | 911 | tconn->meta.socket = s; |
907599e0 | 912 | set_bit(DISCARD_CONCURRENT, &tconn->flags); |
b411b363 PR |
913 | break; |
914 | default: | |
907599e0 | 915 | conn_warn(tconn, "Error receiving initial packet\n"); |
b411b363 PR |
916 | sock_release(s); |
917 | if (random32() & 1) | |
918 | goto retry; | |
919 | } | |
920 | } | |
921 | ||
bbeb641c | 922 | if (tconn->cstate <= C_DISCONNECTING) |
b411b363 PR |
923 | goto out_release_sockets; |
924 | if (signal_pending(current)) { | |
925 | flush_signals(current); | |
926 | smp_rmb(); | |
907599e0 | 927 | if (get_t_state(&tconn->receiver) == EXITING) |
b411b363 PR |
928 | goto out_release_sockets; |
929 | } | |
930 | ||
2bf89621 AG |
931 | if (tconn->data.socket && &tconn->meta.socket) { |
932 | ok = drbd_socket_okay(&tconn->data.socket); | |
933 | ok = drbd_socket_okay(&tconn->meta.socket) && ok; | |
b411b363 PR |
934 | if (ok) |
935 | break; | |
936 | } | |
937 | } while (1); | |
938 | ||
2bf89621 AG |
939 | sock = tconn->data.socket; |
940 | msock = tconn->meta.socket; | |
941 | ||
b411b363 PR |
942 | msock->sk->sk_reuse = 1; /* SO_REUSEADDR */ |
943 | sock->sk->sk_reuse = 1; /* SO_REUSEADDR */ | |
944 | ||
945 | sock->sk->sk_allocation = GFP_NOIO; | |
946 | msock->sk->sk_allocation = GFP_NOIO; | |
947 | ||
948 | sock->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; | |
949 | msock->sk->sk_priority = TC_PRIO_INTERACTIVE; | |
950 | ||
b411b363 | 951 | /* NOT YET ... |
907599e0 | 952 | * sock->sk->sk_sndtimeo = tconn->net_conf->timeout*HZ/10; |
b411b363 | 953 | * sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; |
6038178e | 954 | * first set it to the P_CONNECTION_FEATURES timeout, |
b411b363 | 955 | * which we set to 4x the configured ping_timeout. */ |
44ed167d PR |
956 | rcu_read_lock(); |
957 | nc = rcu_dereference(tconn->net_conf); | |
958 | ||
b411b363 | 959 | sock->sk->sk_sndtimeo = |
44ed167d PR |
960 | sock->sk->sk_rcvtimeo = nc->ping_timeo*4*HZ/10; |
961 | ||
962 | msock->sk->sk_rcvtimeo = nc->ping_int*HZ; | |
963 | timeout = nc->timeout * HZ / 10; | |
08b165ba | 964 | discard_my_data = nc->discard_my_data; |
44ed167d | 965 | rcu_read_unlock(); |
b411b363 | 966 | |
44ed167d | 967 | msock->sk->sk_sndtimeo = timeout; |
b411b363 PR |
968 | |
969 | /* we don't want delays. | |
25985edc | 970 | * we use TCP_CORK where appropriate, though */ |
b411b363 PR |
971 | drbd_tcp_nodelay(sock); |
972 | drbd_tcp_nodelay(msock); | |
973 | ||
907599e0 | 974 | tconn->last_received = jiffies; |
b411b363 | 975 | |
6038178e | 976 | h = drbd_do_features(tconn); |
b411b363 PR |
977 | if (h <= 0) |
978 | return h; | |
979 | ||
907599e0 | 980 | if (tconn->cram_hmac_tfm) { |
b411b363 | 981 | /* drbd_request_state(mdev, NS(conn, WFAuth)); */ |
907599e0 | 982 | switch (drbd_do_auth(tconn)) { |
b10d96cb | 983 | case -1: |
907599e0 | 984 | conn_err(tconn, "Authentication of peer failed\n"); |
b411b363 | 985 | return -1; |
b10d96cb | 986 | case 0: |
907599e0 | 987 | conn_err(tconn, "Authentication of peer failed, trying again.\n"); |
b10d96cb | 988 | return 0; |
b411b363 PR |
989 | } |
990 | } | |
991 | ||
44ed167d | 992 | sock->sk->sk_sndtimeo = timeout; |
b411b363 PR |
993 | sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; |
994 | ||
387eb308 | 995 | if (drbd_send_protocol(tconn) == -EOPNOTSUPP) |
7e2455c1 | 996 | return -1; |
b411b363 | 997 | |
c141ebda PR |
998 | rcu_read_lock(); |
999 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { | |
1000 | kref_get(&mdev->kref); | |
1001 | rcu_read_unlock(); | |
08b165ba PR |
1002 | |
1003 | if (discard_my_data) | |
1004 | set_bit(DISCARD_MY_DATA, &mdev->flags); | |
1005 | else | |
1006 | clear_bit(DISCARD_MY_DATA, &mdev->flags); | |
1007 | ||
c141ebda PR |
1008 | drbd_connected(mdev); |
1009 | kref_put(&mdev->kref, &drbd_minor_destroy); | |
1010 | rcu_read_lock(); | |
1011 | } | |
1012 | rcu_read_unlock(); | |
1013 | ||
823bd832 PR |
1014 | if (conn_request_state(tconn, NS(conn, C_WF_REPORT_PARAMS), CS_VERBOSE) < SS_SUCCESS) |
1015 | return 0; | |
1016 | ||
1017 | drbd_thread_start(&tconn->asender); | |
1018 | ||
08b165ba PR |
1019 | mutex_lock(&tconn->conf_update); |
1020 | /* The discard_my_data flag is a single-shot modifier to the next | |
1021 | * connection attempt, the handshake of which is now well underway. | |
1022 | * No need for rcu style copying of the whole struct | |
1023 | * just to clear a single value. */ | |
1024 | tconn->net_conf->discard_my_data = 0; | |
1025 | mutex_unlock(&tconn->conf_update); | |
1026 | ||
d3fcb490 | 1027 | return h; |
b411b363 PR |
1028 | |
1029 | out_release_sockets: | |
2bf89621 AG |
1030 | if (tconn->data.socket) { |
1031 | sock_release(tconn->data.socket); | |
1032 | tconn->data.socket = NULL; | |
1033 | } | |
1034 | if (tconn->meta.socket) { | |
1035 | sock_release(tconn->meta.socket); | |
1036 | tconn->meta.socket = NULL; | |
1037 | } | |
b411b363 PR |
1038 | return -1; |
1039 | } | |
1040 | ||
e658983a | 1041 | static int decode_header(struct drbd_tconn *tconn, void *header, struct packet_info *pi) |
b411b363 | 1042 | { |
e658983a AG |
1043 | unsigned int header_size = drbd_header_size(tconn); |
1044 | ||
0c8e36d9 AG |
1045 | if (header_size == sizeof(struct p_header100) && |
1046 | *(__be32 *)header == cpu_to_be32(DRBD_MAGIC_100)) { | |
1047 | struct p_header100 *h = header; | |
1048 | if (h->pad != 0) { | |
1049 | conn_err(tconn, "Header padding is not zero\n"); | |
1050 | return -EINVAL; | |
1051 | } | |
1052 | pi->vnr = be16_to_cpu(h->volume); | |
1053 | pi->cmd = be16_to_cpu(h->command); | |
1054 | pi->size = be32_to_cpu(h->length); | |
1055 | } else if (header_size == sizeof(struct p_header95) && | |
1056 | *(__be16 *)header == cpu_to_be16(DRBD_MAGIC_BIG)) { | |
e658983a | 1057 | struct p_header95 *h = header; |
e658983a | 1058 | pi->cmd = be16_to_cpu(h->command); |
b55d84ba AG |
1059 | pi->size = be32_to_cpu(h->length); |
1060 | pi->vnr = 0; | |
e658983a AG |
1061 | } else if (header_size == sizeof(struct p_header80) && |
1062 | *(__be32 *)header == cpu_to_be32(DRBD_MAGIC)) { | |
1063 | struct p_header80 *h = header; | |
1064 | pi->cmd = be16_to_cpu(h->command); | |
1065 | pi->size = be16_to_cpu(h->length); | |
77351055 | 1066 | pi->vnr = 0; |
02918be2 | 1067 | } else { |
e658983a AG |
1068 | conn_err(tconn, "Wrong magic value 0x%08x in protocol version %d\n", |
1069 | be32_to_cpu(*(__be32 *)header), | |
1070 | tconn->agreed_pro_version); | |
8172f3e9 | 1071 | return -EINVAL; |
b411b363 | 1072 | } |
e658983a | 1073 | pi->data = header + header_size; |
8172f3e9 | 1074 | return 0; |
257d0af6 PR |
1075 | } |
1076 | ||
9ba7aa00 | 1077 | static int drbd_recv_header(struct drbd_tconn *tconn, struct packet_info *pi) |
257d0af6 | 1078 | { |
e658983a | 1079 | void *buffer = tconn->data.rbuf; |
69bc7bc3 | 1080 | int err; |
257d0af6 | 1081 | |
e658983a | 1082 | err = drbd_recv_all_warn(tconn, buffer, drbd_header_size(tconn)); |
a5c31904 | 1083 | if (err) |
69bc7bc3 | 1084 | return err; |
257d0af6 | 1085 | |
e658983a | 1086 | err = decode_header(tconn, buffer, pi); |
9ba7aa00 | 1087 | tconn->last_received = jiffies; |
b411b363 | 1088 | |
69bc7bc3 | 1089 | return err; |
b411b363 PR |
1090 | } |
1091 | ||
4b0007c0 | 1092 | static void drbd_flush(struct drbd_tconn *tconn) |
b411b363 PR |
1093 | { |
1094 | int rv; | |
4b0007c0 PR |
1095 | struct drbd_conf *mdev; |
1096 | int vnr; | |
1097 | ||
1098 | if (tconn->write_ordering >= WO_bdev_flush) { | |
1099 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { | |
1100 | if (get_ldev(mdev)) { | |
1101 | rv = blkdev_issue_flush(mdev->ldev->backing_bdev, GFP_KERNEL, | |
1102 | NULL); | |
1103 | put_ldev(mdev); | |
1104 | ||
1105 | if (rv) { | |
1106 | dev_info(DEV, "local disk flush failed with status %d\n", rv); | |
1107 | /* would rather check on EOPNOTSUPP, but that is not reliable. | |
1108 | * don't try again for ANY return value != 0 | |
1109 | * if (rv == -EOPNOTSUPP) */ | |
1110 | drbd_bump_write_ordering(tconn, WO_drain_io); | |
1111 | break; | |
1112 | } | |
1113 | } | |
b411b363 | 1114 | } |
b411b363 | 1115 | } |
b411b363 PR |
1116 | } |
1117 | ||
1118 | /** | |
1119 | * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. | |
1120 | * @mdev: DRBD device. | |
1121 | * @epoch: Epoch object. | |
1122 | * @ev: Epoch event. | |
1123 | */ | |
1e9dd291 | 1124 | static enum finish_epoch drbd_may_finish_epoch(struct drbd_tconn *tconn, |
b411b363 PR |
1125 | struct drbd_epoch *epoch, |
1126 | enum epoch_event ev) | |
1127 | { | |
2451fc3b | 1128 | int epoch_size; |
b411b363 | 1129 | struct drbd_epoch *next_epoch; |
b411b363 PR |
1130 | enum finish_epoch rv = FE_STILL_LIVE; |
1131 | ||
12038a3a | 1132 | spin_lock(&tconn->epoch_lock); |
b411b363 PR |
1133 | do { |
1134 | next_epoch = NULL; | |
b411b363 PR |
1135 | |
1136 | epoch_size = atomic_read(&epoch->epoch_size); | |
1137 | ||
1138 | switch (ev & ~EV_CLEANUP) { | |
1139 | case EV_PUT: | |
1140 | atomic_dec(&epoch->active); | |
1141 | break; | |
1142 | case EV_GOT_BARRIER_NR: | |
1143 | set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); | |
b411b363 PR |
1144 | break; |
1145 | case EV_BECAME_LAST: | |
1146 | /* nothing to do*/ | |
1147 | break; | |
1148 | } | |
1149 | ||
b411b363 PR |
1150 | if (epoch_size != 0 && |
1151 | atomic_read(&epoch->active) == 0 && | |
85d73513 | 1152 | (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags) || ev & EV_CLEANUP)) { |
b411b363 | 1153 | if (!(ev & EV_CLEANUP)) { |
12038a3a | 1154 | spin_unlock(&tconn->epoch_lock); |
1d2783d5 | 1155 | drbd_send_b_ack(epoch->mdev, epoch->barrier_nr, epoch_size); |
12038a3a | 1156 | spin_lock(&tconn->epoch_lock); |
b411b363 | 1157 | } |
85d73513 | 1158 | if (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) |
1d2783d5 | 1159 | dec_unacked(epoch->mdev); |
b411b363 | 1160 | |
12038a3a | 1161 | if (tconn->current_epoch != epoch) { |
b411b363 PR |
1162 | next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); |
1163 | list_del(&epoch->list); | |
1164 | ev = EV_BECAME_LAST | (ev & EV_CLEANUP); | |
12038a3a | 1165 | tconn->epochs--; |
b411b363 PR |
1166 | kfree(epoch); |
1167 | ||
1168 | if (rv == FE_STILL_LIVE) | |
1169 | rv = FE_DESTROYED; | |
1170 | } else { | |
1171 | epoch->flags = 0; | |
1172 | atomic_set(&epoch->epoch_size, 0); | |
698f9315 | 1173 | /* atomic_set(&epoch->active, 0); is already zero */ |
b411b363 PR |
1174 | if (rv == FE_STILL_LIVE) |
1175 | rv = FE_RECYCLED; | |
1176 | } | |
1177 | } | |
1178 | ||
1179 | if (!next_epoch) | |
1180 | break; | |
1181 | ||
1182 | epoch = next_epoch; | |
1183 | } while (1); | |
1184 | ||
12038a3a | 1185 | spin_unlock(&tconn->epoch_lock); |
b411b363 | 1186 | |
b411b363 PR |
1187 | return rv; |
1188 | } | |
1189 | ||
1190 | /** | |
1191 | * drbd_bump_write_ordering() - Fall back to an other write ordering method | |
4b0007c0 | 1192 | * @tconn: DRBD connection. |
b411b363 PR |
1193 | * @wo: Write ordering method to try. |
1194 | */ | |
4b0007c0 | 1195 | void drbd_bump_write_ordering(struct drbd_tconn *tconn, enum write_ordering_e wo) |
b411b363 | 1196 | { |
daeda1cc | 1197 | struct disk_conf *dc; |
4b0007c0 | 1198 | struct drbd_conf *mdev; |
b411b363 | 1199 | enum write_ordering_e pwo; |
4b0007c0 | 1200 | int vnr; |
b411b363 PR |
1201 | static char *write_ordering_str[] = { |
1202 | [WO_none] = "none", | |
1203 | [WO_drain_io] = "drain", | |
1204 | [WO_bdev_flush] = "flush", | |
b411b363 PR |
1205 | }; |
1206 | ||
4b0007c0 | 1207 | pwo = tconn->write_ordering; |
b411b363 | 1208 | wo = min(pwo, wo); |
daeda1cc | 1209 | rcu_read_lock(); |
4b0007c0 PR |
1210 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { |
1211 | if (!get_ldev(mdev)) | |
1212 | continue; | |
1213 | dc = rcu_dereference(mdev->ldev->disk_conf); | |
1214 | ||
1215 | if (wo == WO_bdev_flush && !dc->disk_flushes) | |
1216 | wo = WO_drain_io; | |
1217 | if (wo == WO_drain_io && !dc->disk_drain) | |
1218 | wo = WO_none; | |
1219 | put_ldev(mdev); | |
1220 | } | |
daeda1cc | 1221 | rcu_read_unlock(); |
4b0007c0 PR |
1222 | tconn->write_ordering = wo; |
1223 | if (pwo != tconn->write_ordering || wo == WO_bdev_flush) | |
1224 | conn_info(tconn, "Method to ensure write ordering: %s\n", write_ordering_str[tconn->write_ordering]); | |
b411b363 PR |
1225 | } |
1226 | ||
45bb912b | 1227 | /** |
fbe29dec | 1228 | * drbd_submit_peer_request() |
45bb912b | 1229 | * @mdev: DRBD device. |
db830c46 | 1230 | * @peer_req: peer request |
45bb912b | 1231 | * @rw: flag field, see bio->bi_rw |
10f6d992 LE |
1232 | * |
1233 | * May spread the pages to multiple bios, | |
1234 | * depending on bio_add_page restrictions. | |
1235 | * | |
1236 | * Returns 0 if all bios have been submitted, | |
1237 | * -ENOMEM if we could not allocate enough bios, | |
1238 | * -ENOSPC (any better suggestion?) if we have not been able to bio_add_page a | |
1239 | * single page to an empty bio (which should never happen and likely indicates | |
1240 | * that the lower level IO stack is in some way broken). This has been observed | |
1241 | * on certain Xen deployments. | |
45bb912b LE |
1242 | */ |
1243 | /* TODO allocate from our own bio_set. */ | |
fbe29dec AG |
1244 | int drbd_submit_peer_request(struct drbd_conf *mdev, |
1245 | struct drbd_peer_request *peer_req, | |
1246 | const unsigned rw, const int fault_type) | |
45bb912b LE |
1247 | { |
1248 | struct bio *bios = NULL; | |
1249 | struct bio *bio; | |
db830c46 AG |
1250 | struct page *page = peer_req->pages; |
1251 | sector_t sector = peer_req->i.sector; | |
1252 | unsigned ds = peer_req->i.size; | |
45bb912b LE |
1253 | unsigned n_bios = 0; |
1254 | unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT; | |
10f6d992 | 1255 | int err = -ENOMEM; |
45bb912b LE |
1256 | |
1257 | /* In most cases, we will only need one bio. But in case the lower | |
1258 | * level restrictions happen to be different at this offset on this | |
1259 | * side than those of the sending peer, we may need to submit the | |
da4a75d2 LE |
1260 | * request in more than one bio. |
1261 | * | |
1262 | * Plain bio_alloc is good enough here, this is no DRBD internally | |
1263 | * generated bio, but a bio allocated on behalf of the peer. | |
1264 | */ | |
45bb912b LE |
1265 | next_bio: |
1266 | bio = bio_alloc(GFP_NOIO, nr_pages); | |
1267 | if (!bio) { | |
1268 | dev_err(DEV, "submit_ee: Allocation of a bio failed\n"); | |
1269 | goto fail; | |
1270 | } | |
db830c46 | 1271 | /* > peer_req->i.sector, unless this is the first bio */ |
45bb912b LE |
1272 | bio->bi_sector = sector; |
1273 | bio->bi_bdev = mdev->ldev->backing_bdev; | |
45bb912b | 1274 | bio->bi_rw = rw; |
db830c46 | 1275 | bio->bi_private = peer_req; |
fcefa62e | 1276 | bio->bi_end_io = drbd_peer_request_endio; |
45bb912b LE |
1277 | |
1278 | bio->bi_next = bios; | |
1279 | bios = bio; | |
1280 | ++n_bios; | |
1281 | ||
1282 | page_chain_for_each(page) { | |
1283 | unsigned len = min_t(unsigned, ds, PAGE_SIZE); | |
1284 | if (!bio_add_page(bio, page, len, 0)) { | |
10f6d992 LE |
1285 | /* A single page must always be possible! |
1286 | * But in case it fails anyways, | |
1287 | * we deal with it, and complain (below). */ | |
1288 | if (bio->bi_vcnt == 0) { | |
1289 | dev_err(DEV, | |
1290 | "bio_add_page failed for len=%u, " | |
1291 | "bi_vcnt=0 (bi_sector=%llu)\n", | |
1292 | len, (unsigned long long)bio->bi_sector); | |
1293 | err = -ENOSPC; | |
1294 | goto fail; | |
1295 | } | |
45bb912b LE |
1296 | goto next_bio; |
1297 | } | |
1298 | ds -= len; | |
1299 | sector += len >> 9; | |
1300 | --nr_pages; | |
1301 | } | |
1302 | D_ASSERT(page == NULL); | |
1303 | D_ASSERT(ds == 0); | |
1304 | ||
db830c46 | 1305 | atomic_set(&peer_req->pending_bios, n_bios); |
45bb912b LE |
1306 | do { |
1307 | bio = bios; | |
1308 | bios = bios->bi_next; | |
1309 | bio->bi_next = NULL; | |
1310 | ||
45bb912b | 1311 | drbd_generic_make_request(mdev, fault_type, bio); |
45bb912b | 1312 | } while (bios); |
45bb912b LE |
1313 | return 0; |
1314 | ||
1315 | fail: | |
1316 | while (bios) { | |
1317 | bio = bios; | |
1318 | bios = bios->bi_next; | |
1319 | bio_put(bio); | |
1320 | } | |
10f6d992 | 1321 | return err; |
45bb912b LE |
1322 | } |
1323 | ||
53840641 | 1324 | static void drbd_remove_epoch_entry_interval(struct drbd_conf *mdev, |
db830c46 | 1325 | struct drbd_peer_request *peer_req) |
53840641 | 1326 | { |
db830c46 | 1327 | struct drbd_interval *i = &peer_req->i; |
53840641 AG |
1328 | |
1329 | drbd_remove_interval(&mdev->write_requests, i); | |
1330 | drbd_clear_interval(i); | |
1331 | ||
6c852bec | 1332 | /* Wake up any processes waiting for this peer request to complete. */ |
53840641 AG |
1333 | if (i->waiting) |
1334 | wake_up(&mdev->misc_wait); | |
1335 | } | |
1336 | ||
77fede51 PR |
1337 | void conn_wait_active_ee_empty(struct drbd_tconn *tconn) |
1338 | { | |
1339 | struct drbd_conf *mdev; | |
1340 | int vnr; | |
1341 | ||
1342 | rcu_read_lock(); | |
1343 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { | |
1344 | kref_get(&mdev->kref); | |
1345 | rcu_read_unlock(); | |
1346 | drbd_wait_ee_list_empty(mdev, &mdev->active_ee); | |
1347 | kref_put(&mdev->kref, &drbd_minor_destroy); | |
1348 | rcu_read_lock(); | |
1349 | } | |
1350 | rcu_read_unlock(); | |
1351 | } | |
1352 | ||
4a76b161 | 1353 | static int receive_Barrier(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 1354 | { |
4a76b161 | 1355 | struct drbd_conf *mdev; |
2451fc3b | 1356 | int rv; |
e658983a | 1357 | struct p_barrier *p = pi->data; |
b411b363 PR |
1358 | struct drbd_epoch *epoch; |
1359 | ||
4a76b161 AG |
1360 | mdev = vnr_to_mdev(tconn, pi->vnr); |
1361 | if (!mdev) | |
1362 | return -EIO; | |
1363 | ||
b411b363 PR |
1364 | inc_unacked(mdev); |
1365 | ||
12038a3a PR |
1366 | tconn->current_epoch->barrier_nr = p->barrier; |
1367 | tconn->current_epoch->mdev = mdev; | |
1e9dd291 | 1368 | rv = drbd_may_finish_epoch(tconn, tconn->current_epoch, EV_GOT_BARRIER_NR); |
b411b363 PR |
1369 | |
1370 | /* P_BARRIER_ACK may imply that the corresponding extent is dropped from | |
1371 | * the activity log, which means it would not be resynced in case the | |
1372 | * R_PRIMARY crashes now. | |
1373 | * Therefore we must send the barrier_ack after the barrier request was | |
1374 | * completed. */ | |
4b0007c0 | 1375 | switch (tconn->write_ordering) { |
b411b363 PR |
1376 | case WO_none: |
1377 | if (rv == FE_RECYCLED) | |
82bc0194 | 1378 | return 0; |
2451fc3b PR |
1379 | |
1380 | /* receiver context, in the writeout path of the other node. | |
1381 | * avoid potential distributed deadlock */ | |
1382 | epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); | |
1383 | if (epoch) | |
1384 | break; | |
1385 | else | |
1386 | dev_warn(DEV, "Allocation of an epoch failed, slowing down\n"); | |
1387 | /* Fall through */ | |
b411b363 PR |
1388 | |
1389 | case WO_bdev_flush: | |
1390 | case WO_drain_io: | |
77fede51 | 1391 | conn_wait_active_ee_empty(tconn); |
4b0007c0 | 1392 | drbd_flush(tconn); |
2451fc3b | 1393 | |
12038a3a | 1394 | if (atomic_read(&tconn->current_epoch->epoch_size)) { |
2451fc3b PR |
1395 | epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); |
1396 | if (epoch) | |
1397 | break; | |
b411b363 PR |
1398 | } |
1399 | ||
12038a3a | 1400 | epoch = tconn->current_epoch; |
2451fc3b PR |
1401 | wait_event(mdev->ee_wait, atomic_read(&epoch->epoch_size) == 0); |
1402 | ||
1403 | D_ASSERT(atomic_read(&epoch->active) == 0); | |
1404 | D_ASSERT(epoch->flags == 0); | |
b411b363 | 1405 | |
82bc0194 | 1406 | return 0; |
2451fc3b | 1407 | default: |
4b0007c0 | 1408 | dev_err(DEV, "Strangeness in tconn->write_ordering %d\n", tconn->write_ordering); |
82bc0194 | 1409 | return -EIO; |
b411b363 PR |
1410 | } |
1411 | ||
1412 | epoch->flags = 0; | |
1413 | atomic_set(&epoch->epoch_size, 0); | |
1414 | atomic_set(&epoch->active, 0); | |
1415 | ||
12038a3a PR |
1416 | spin_lock(&tconn->epoch_lock); |
1417 | if (atomic_read(&tconn->current_epoch->epoch_size)) { | |
1418 | list_add(&epoch->list, &tconn->current_epoch->list); | |
1419 | tconn->current_epoch = epoch; | |
1420 | tconn->epochs++; | |
b411b363 PR |
1421 | } else { |
1422 | /* The current_epoch got recycled while we allocated this one... */ | |
1423 | kfree(epoch); | |
1424 | } | |
12038a3a | 1425 | spin_unlock(&tconn->epoch_lock); |
b411b363 | 1426 | |
82bc0194 | 1427 | return 0; |
b411b363 PR |
1428 | } |
1429 | ||
1430 | /* used from receive_RSDataReply (recv_resync_read) | |
1431 | * and from receive_Data */ | |
f6ffca9f AG |
1432 | static struct drbd_peer_request * |
1433 | read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, | |
1434 | int data_size) __must_hold(local) | |
b411b363 | 1435 | { |
6666032a | 1436 | const sector_t capacity = drbd_get_capacity(mdev->this_bdev); |
db830c46 | 1437 | struct drbd_peer_request *peer_req; |
b411b363 | 1438 | struct page *page; |
a5c31904 | 1439 | int dgs, ds, err; |
a0638456 PR |
1440 | void *dig_in = mdev->tconn->int_dig_in; |
1441 | void *dig_vv = mdev->tconn->int_dig_vv; | |
6b4388ac | 1442 | unsigned long *data; |
b411b363 | 1443 | |
88104ca4 AG |
1444 | dgs = 0; |
1445 | if (mdev->tconn->peer_integrity_tfm) { | |
1446 | dgs = crypto_hash_digestsize(mdev->tconn->peer_integrity_tfm); | |
9f5bdc33 AG |
1447 | /* |
1448 | * FIXME: Receive the incoming digest into the receive buffer | |
1449 | * here, together with its struct p_data? | |
1450 | */ | |
a5c31904 AG |
1451 | err = drbd_recv_all_warn(mdev->tconn, dig_in, dgs); |
1452 | if (err) | |
b411b363 | 1453 | return NULL; |
88104ca4 | 1454 | data_size -= dgs; |
b411b363 PR |
1455 | } |
1456 | ||
841ce241 AG |
1457 | if (!expect(data_size != 0)) |
1458 | return NULL; | |
1459 | if (!expect(IS_ALIGNED(data_size, 512))) | |
1460 | return NULL; | |
1461 | if (!expect(data_size <= DRBD_MAX_BIO_SIZE)) | |
1462 | return NULL; | |
b411b363 | 1463 | |
6666032a LE |
1464 | /* even though we trust out peer, |
1465 | * we sometimes have to double check. */ | |
1466 | if (sector + (data_size>>9) > capacity) { | |
fdda6544 LE |
1467 | dev_err(DEV, "request from peer beyond end of local disk: " |
1468 | "capacity: %llus < sector: %llus + size: %u\n", | |
6666032a LE |
1469 | (unsigned long long)capacity, |
1470 | (unsigned long long)sector, data_size); | |
1471 | return NULL; | |
1472 | } | |
1473 | ||
b411b363 PR |
1474 | /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD |
1475 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
1476 | * which in turn might block on the other node at this very place. */ | |
0db55363 | 1477 | peer_req = drbd_alloc_peer_req(mdev, id, sector, data_size, GFP_NOIO); |
db830c46 | 1478 | if (!peer_req) |
b411b363 | 1479 | return NULL; |
45bb912b | 1480 | |
b411b363 | 1481 | ds = data_size; |
db830c46 | 1482 | page = peer_req->pages; |
45bb912b LE |
1483 | page_chain_for_each(page) { |
1484 | unsigned len = min_t(int, ds, PAGE_SIZE); | |
6b4388ac | 1485 | data = kmap(page); |
a5c31904 | 1486 | err = drbd_recv_all_warn(mdev->tconn, data, len); |
0cf9d27e | 1487 | if (drbd_insert_fault(mdev, DRBD_FAULT_RECEIVE)) { |
6b4388ac PR |
1488 | dev_err(DEV, "Fault injection: Corrupting data on receive\n"); |
1489 | data[0] = data[0] ^ (unsigned long)-1; | |
1490 | } | |
b411b363 | 1491 | kunmap(page); |
a5c31904 | 1492 | if (err) { |
3967deb1 | 1493 | drbd_free_peer_req(mdev, peer_req); |
b411b363 PR |
1494 | return NULL; |
1495 | } | |
a5c31904 | 1496 | ds -= len; |
b411b363 PR |
1497 | } |
1498 | ||
1499 | if (dgs) { | |
5b614abe | 1500 | drbd_csum_ee(mdev, mdev->tconn->peer_integrity_tfm, peer_req, dig_vv); |
b411b363 | 1501 | if (memcmp(dig_in, dig_vv, dgs)) { |
470be44a LE |
1502 | dev_err(DEV, "Digest integrity check FAILED: %llus +%u\n", |
1503 | (unsigned long long)sector, data_size); | |
3967deb1 | 1504 | drbd_free_peer_req(mdev, peer_req); |
b411b363 PR |
1505 | return NULL; |
1506 | } | |
1507 | } | |
1508 | mdev->recv_cnt += data_size>>9; | |
db830c46 | 1509 | return peer_req; |
b411b363 PR |
1510 | } |
1511 | ||
1512 | /* drbd_drain_block() just takes a data block | |
1513 | * out of the socket input buffer, and discards it. | |
1514 | */ | |
1515 | static int drbd_drain_block(struct drbd_conf *mdev, int data_size) | |
1516 | { | |
1517 | struct page *page; | |
a5c31904 | 1518 | int err = 0; |
b411b363 PR |
1519 | void *data; |
1520 | ||
c3470cde | 1521 | if (!data_size) |
fc5be839 | 1522 | return 0; |
c3470cde | 1523 | |
c37c8ecf | 1524 | page = drbd_alloc_pages(mdev, 1, 1); |
b411b363 PR |
1525 | |
1526 | data = kmap(page); | |
1527 | while (data_size) { | |
fc5be839 AG |
1528 | unsigned int len = min_t(int, data_size, PAGE_SIZE); |
1529 | ||
a5c31904 AG |
1530 | err = drbd_recv_all_warn(mdev->tconn, data, len); |
1531 | if (err) | |
b411b363 | 1532 | break; |
a5c31904 | 1533 | data_size -= len; |
b411b363 PR |
1534 | } |
1535 | kunmap(page); | |
5cc287e0 | 1536 | drbd_free_pages(mdev, page, 0); |
fc5be839 | 1537 | return err; |
b411b363 PR |
1538 | } |
1539 | ||
1540 | static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req, | |
1541 | sector_t sector, int data_size) | |
1542 | { | |
1543 | struct bio_vec *bvec; | |
1544 | struct bio *bio; | |
a5c31904 | 1545 | int dgs, err, i, expect; |
a0638456 PR |
1546 | void *dig_in = mdev->tconn->int_dig_in; |
1547 | void *dig_vv = mdev->tconn->int_dig_vv; | |
b411b363 | 1548 | |
88104ca4 AG |
1549 | dgs = 0; |
1550 | if (mdev->tconn->peer_integrity_tfm) { | |
1551 | dgs = crypto_hash_digestsize(mdev->tconn->peer_integrity_tfm); | |
a5c31904 AG |
1552 | err = drbd_recv_all_warn(mdev->tconn, dig_in, dgs); |
1553 | if (err) | |
1554 | return err; | |
88104ca4 | 1555 | data_size -= dgs; |
b411b363 PR |
1556 | } |
1557 | ||
b411b363 PR |
1558 | /* optimistically update recv_cnt. if receiving fails below, |
1559 | * we disconnect anyways, and counters will be reset. */ | |
1560 | mdev->recv_cnt += data_size>>9; | |
1561 | ||
1562 | bio = req->master_bio; | |
1563 | D_ASSERT(sector == bio->bi_sector); | |
1564 | ||
1565 | bio_for_each_segment(bvec, bio, i) { | |
a5c31904 | 1566 | void *mapped = kmap(bvec->bv_page) + bvec->bv_offset; |
b411b363 | 1567 | expect = min_t(int, data_size, bvec->bv_len); |
a5c31904 | 1568 | err = drbd_recv_all_warn(mdev->tconn, mapped, expect); |
b411b363 | 1569 | kunmap(bvec->bv_page); |
a5c31904 AG |
1570 | if (err) |
1571 | return err; | |
1572 | data_size -= expect; | |
b411b363 PR |
1573 | } |
1574 | ||
1575 | if (dgs) { | |
5b614abe | 1576 | drbd_csum_bio(mdev, mdev->tconn->peer_integrity_tfm, bio, dig_vv); |
b411b363 PR |
1577 | if (memcmp(dig_in, dig_vv, dgs)) { |
1578 | dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n"); | |
28284cef | 1579 | return -EINVAL; |
b411b363 PR |
1580 | } |
1581 | } | |
1582 | ||
1583 | D_ASSERT(data_size == 0); | |
28284cef | 1584 | return 0; |
b411b363 PR |
1585 | } |
1586 | ||
a990be46 AG |
1587 | /* |
1588 | * e_end_resync_block() is called in asender context via | |
1589 | * drbd_finish_peer_reqs(). | |
1590 | */ | |
99920dc5 | 1591 | static int e_end_resync_block(struct drbd_work *w, int unused) |
b411b363 | 1592 | { |
8050e6d0 AG |
1593 | struct drbd_peer_request *peer_req = |
1594 | container_of(w, struct drbd_peer_request, w); | |
00d56944 | 1595 | struct drbd_conf *mdev = w->mdev; |
db830c46 | 1596 | sector_t sector = peer_req->i.sector; |
99920dc5 | 1597 | int err; |
b411b363 | 1598 | |
db830c46 | 1599 | D_ASSERT(drbd_interval_empty(&peer_req->i)); |
b411b363 | 1600 | |
db830c46 AG |
1601 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
1602 | drbd_set_in_sync(mdev, sector, peer_req->i.size); | |
99920dc5 | 1603 | err = drbd_send_ack(mdev, P_RS_WRITE_ACK, peer_req); |
b411b363 PR |
1604 | } else { |
1605 | /* Record failure to sync */ | |
db830c46 | 1606 | drbd_rs_failed_io(mdev, sector, peer_req->i.size); |
b411b363 | 1607 | |
99920dc5 | 1608 | err = drbd_send_ack(mdev, P_NEG_ACK, peer_req); |
b411b363 PR |
1609 | } |
1610 | dec_unacked(mdev); | |
1611 | ||
99920dc5 | 1612 | return err; |
b411b363 PR |
1613 | } |
1614 | ||
1615 | static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local) | |
1616 | { | |
db830c46 | 1617 | struct drbd_peer_request *peer_req; |
b411b363 | 1618 | |
db830c46 AG |
1619 | peer_req = read_in_block(mdev, ID_SYNCER, sector, data_size); |
1620 | if (!peer_req) | |
45bb912b | 1621 | goto fail; |
b411b363 PR |
1622 | |
1623 | dec_rs_pending(mdev); | |
1624 | ||
b411b363 PR |
1625 | inc_unacked(mdev); |
1626 | /* corresponding dec_unacked() in e_end_resync_block() | |
1627 | * respective _drbd_clear_done_ee */ | |
1628 | ||
db830c46 | 1629 | peer_req->w.cb = e_end_resync_block; |
45bb912b | 1630 | |
87eeee41 | 1631 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 | 1632 | list_add(&peer_req->w.list, &mdev->sync_ee); |
87eeee41 | 1633 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 1634 | |
0f0601f4 | 1635 | atomic_add(data_size >> 9, &mdev->rs_sect_ev); |
fbe29dec | 1636 | if (drbd_submit_peer_request(mdev, peer_req, WRITE, DRBD_FAULT_RS_WR) == 0) |
e1c1b0fc | 1637 | return 0; |
b411b363 | 1638 | |
10f6d992 LE |
1639 | /* don't care for the reason here */ |
1640 | dev_err(DEV, "submit failed, triggering re-connect\n"); | |
87eeee41 | 1641 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 | 1642 | list_del(&peer_req->w.list); |
87eeee41 | 1643 | spin_unlock_irq(&mdev->tconn->req_lock); |
22cc37a9 | 1644 | |
3967deb1 | 1645 | drbd_free_peer_req(mdev, peer_req); |
45bb912b LE |
1646 | fail: |
1647 | put_ldev(mdev); | |
e1c1b0fc | 1648 | return -EIO; |
b411b363 PR |
1649 | } |
1650 | ||
668eebc6 | 1651 | static struct drbd_request * |
bc9c5c41 AG |
1652 | find_request(struct drbd_conf *mdev, struct rb_root *root, u64 id, |
1653 | sector_t sector, bool missing_ok, const char *func) | |
51624585 | 1654 | { |
51624585 AG |
1655 | struct drbd_request *req; |
1656 | ||
bc9c5c41 AG |
1657 | /* Request object according to our peer */ |
1658 | req = (struct drbd_request *)(unsigned long)id; | |
5e472264 | 1659 | if (drbd_contains_interval(root, sector, &req->i) && req->i.local) |
668eebc6 | 1660 | return req; |
c3afd8f5 | 1661 | if (!missing_ok) { |
5af172ed | 1662 | dev_err(DEV, "%s: failed to find request 0x%lx, sector %llus\n", func, |
c3afd8f5 AG |
1663 | (unsigned long)id, (unsigned long long)sector); |
1664 | } | |
51624585 AG |
1665 | return NULL; |
1666 | } | |
1667 | ||
4a76b161 | 1668 | static int receive_DataReply(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 1669 | { |
4a76b161 | 1670 | struct drbd_conf *mdev; |
b411b363 PR |
1671 | struct drbd_request *req; |
1672 | sector_t sector; | |
82bc0194 | 1673 | int err; |
e658983a | 1674 | struct p_data *p = pi->data; |
4a76b161 AG |
1675 | |
1676 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
1677 | if (!mdev) | |
1678 | return -EIO; | |
b411b363 PR |
1679 | |
1680 | sector = be64_to_cpu(p->sector); | |
1681 | ||
87eeee41 | 1682 | spin_lock_irq(&mdev->tconn->req_lock); |
bc9c5c41 | 1683 | req = find_request(mdev, &mdev->read_requests, p->block_id, sector, false, __func__); |
87eeee41 | 1684 | spin_unlock_irq(&mdev->tconn->req_lock); |
c3afd8f5 | 1685 | if (unlikely(!req)) |
82bc0194 | 1686 | return -EIO; |
b411b363 | 1687 | |
24c4830c | 1688 | /* hlist_del(&req->collision) is done in _req_may_be_done, to avoid |
b411b363 PR |
1689 | * special casing it there for the various failure cases. |
1690 | * still no race with drbd_fail_pending_reads */ | |
e2857216 | 1691 | err = recv_dless_read(mdev, req, sector, pi->size); |
82bc0194 | 1692 | if (!err) |
8554df1c | 1693 | req_mod(req, DATA_RECEIVED); |
b411b363 PR |
1694 | /* else: nothing. handled from drbd_disconnect... |
1695 | * I don't think we may complete this just yet | |
1696 | * in case we are "on-disconnect: freeze" */ | |
1697 | ||
82bc0194 | 1698 | return err; |
b411b363 PR |
1699 | } |
1700 | ||
4a76b161 | 1701 | static int receive_RSDataReply(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 1702 | { |
4a76b161 | 1703 | struct drbd_conf *mdev; |
b411b363 | 1704 | sector_t sector; |
82bc0194 | 1705 | int err; |
e658983a | 1706 | struct p_data *p = pi->data; |
4a76b161 AG |
1707 | |
1708 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
1709 | if (!mdev) | |
1710 | return -EIO; | |
b411b363 PR |
1711 | |
1712 | sector = be64_to_cpu(p->sector); | |
1713 | D_ASSERT(p->block_id == ID_SYNCER); | |
1714 | ||
1715 | if (get_ldev(mdev)) { | |
1716 | /* data is submitted to disk within recv_resync_read. | |
1717 | * corresponding put_ldev done below on error, | |
fcefa62e | 1718 | * or in drbd_peer_request_endio. */ |
e2857216 | 1719 | err = recv_resync_read(mdev, sector, pi->size); |
b411b363 PR |
1720 | } else { |
1721 | if (__ratelimit(&drbd_ratelimit_state)) | |
1722 | dev_err(DEV, "Can not write resync data to local disk.\n"); | |
1723 | ||
e2857216 | 1724 | err = drbd_drain_block(mdev, pi->size); |
b411b363 | 1725 | |
e2857216 | 1726 | drbd_send_ack_dp(mdev, P_NEG_ACK, p, pi->size); |
b411b363 PR |
1727 | } |
1728 | ||
e2857216 | 1729 | atomic_add(pi->size >> 9, &mdev->rs_sect_in); |
778f271d | 1730 | |
82bc0194 | 1731 | return err; |
b411b363 PR |
1732 | } |
1733 | ||
99920dc5 | 1734 | static int w_restart_write(struct drbd_work *w, int cancel) |
7be8da07 AG |
1735 | { |
1736 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
1737 | struct drbd_conf *mdev = w->mdev; | |
1738 | struct bio *bio; | |
1739 | unsigned long start_time; | |
1740 | unsigned long flags; | |
1741 | ||
1742 | spin_lock_irqsave(&mdev->tconn->req_lock, flags); | |
1743 | if (!expect(req->rq_state & RQ_POSTPONED)) { | |
1744 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); | |
99920dc5 | 1745 | return -EIO; |
7be8da07 AG |
1746 | } |
1747 | bio = req->master_bio; | |
1748 | start_time = req->start_time; | |
1749 | /* Postponed requests will not have their master_bio completed! */ | |
1750 | __req_mod(req, DISCARD_WRITE, NULL); | |
1751 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); | |
1752 | ||
1753 | while (__drbd_make_request(mdev, bio, start_time)) | |
1754 | /* retry */ ; | |
99920dc5 | 1755 | return 0; |
7be8da07 AG |
1756 | } |
1757 | ||
1758 | static void restart_conflicting_writes(struct drbd_conf *mdev, | |
1759 | sector_t sector, int size) | |
1760 | { | |
1761 | struct drbd_interval *i; | |
1762 | struct drbd_request *req; | |
1763 | ||
1764 | drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { | |
1765 | if (!i->local) | |
1766 | continue; | |
1767 | req = container_of(i, struct drbd_request, i); | |
1768 | if (req->rq_state & RQ_LOCAL_PENDING || | |
1769 | !(req->rq_state & RQ_POSTPONED)) | |
1770 | continue; | |
1771 | if (expect(list_empty(&req->w.list))) { | |
1772 | req->w.mdev = mdev; | |
1773 | req->w.cb = w_restart_write; | |
1774 | drbd_queue_work(&mdev->tconn->data.work, &req->w); | |
1775 | } | |
1776 | } | |
1777 | } | |
1778 | ||
a990be46 AG |
1779 | /* |
1780 | * e_end_block() is called in asender context via drbd_finish_peer_reqs(). | |
b411b363 | 1781 | */ |
99920dc5 | 1782 | static int e_end_block(struct drbd_work *w, int cancel) |
b411b363 | 1783 | { |
8050e6d0 AG |
1784 | struct drbd_peer_request *peer_req = |
1785 | container_of(w, struct drbd_peer_request, w); | |
00d56944 | 1786 | struct drbd_conf *mdev = w->mdev; |
db830c46 | 1787 | sector_t sector = peer_req->i.sector; |
99920dc5 | 1788 | int err = 0, pcmd; |
b411b363 | 1789 | |
303d1448 | 1790 | if (peer_req->flags & EE_SEND_WRITE_ACK) { |
db830c46 | 1791 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
1792 | pcmd = (mdev->state.conn >= C_SYNC_SOURCE && |
1793 | mdev->state.conn <= C_PAUSED_SYNC_T && | |
db830c46 | 1794 | peer_req->flags & EE_MAY_SET_IN_SYNC) ? |
b411b363 | 1795 | P_RS_WRITE_ACK : P_WRITE_ACK; |
99920dc5 | 1796 | err = drbd_send_ack(mdev, pcmd, peer_req); |
b411b363 | 1797 | if (pcmd == P_RS_WRITE_ACK) |
db830c46 | 1798 | drbd_set_in_sync(mdev, sector, peer_req->i.size); |
b411b363 | 1799 | } else { |
99920dc5 | 1800 | err = drbd_send_ack(mdev, P_NEG_ACK, peer_req); |
b411b363 PR |
1801 | /* we expect it to be marked out of sync anyways... |
1802 | * maybe assert this? */ | |
1803 | } | |
1804 | dec_unacked(mdev); | |
1805 | } | |
1806 | /* we delete from the conflict detection hash _after_ we sent out the | |
1807 | * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ | |
302bdeae | 1808 | if (peer_req->flags & EE_IN_INTERVAL_TREE) { |
87eeee41 | 1809 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 AG |
1810 | D_ASSERT(!drbd_interval_empty(&peer_req->i)); |
1811 | drbd_remove_epoch_entry_interval(mdev, peer_req); | |
7be8da07 AG |
1812 | if (peer_req->flags & EE_RESTART_REQUESTS) |
1813 | restart_conflicting_writes(mdev, sector, peer_req->i.size); | |
87eeee41 | 1814 | spin_unlock_irq(&mdev->tconn->req_lock); |
bb3bfe96 | 1815 | } else |
db830c46 | 1816 | D_ASSERT(drbd_interval_empty(&peer_req->i)); |
b411b363 | 1817 | |
1e9dd291 | 1818 | drbd_may_finish_epoch(mdev->tconn, peer_req->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); |
b411b363 | 1819 | |
99920dc5 | 1820 | return err; |
b411b363 PR |
1821 | } |
1822 | ||
7be8da07 | 1823 | static int e_send_ack(struct drbd_work *w, enum drbd_packet ack) |
b411b363 | 1824 | { |
7be8da07 | 1825 | struct drbd_conf *mdev = w->mdev; |
8050e6d0 AG |
1826 | struct drbd_peer_request *peer_req = |
1827 | container_of(w, struct drbd_peer_request, w); | |
99920dc5 | 1828 | int err; |
b411b363 | 1829 | |
99920dc5 | 1830 | err = drbd_send_ack(mdev, ack, peer_req); |
b411b363 PR |
1831 | dec_unacked(mdev); |
1832 | ||
99920dc5 | 1833 | return err; |
b411b363 PR |
1834 | } |
1835 | ||
99920dc5 | 1836 | static int e_send_discard_write(struct drbd_work *w, int unused) |
7be8da07 AG |
1837 | { |
1838 | return e_send_ack(w, P_DISCARD_WRITE); | |
1839 | } | |
1840 | ||
99920dc5 | 1841 | static int e_send_retry_write(struct drbd_work *w, int unused) |
7be8da07 AG |
1842 | { |
1843 | struct drbd_tconn *tconn = w->mdev->tconn; | |
1844 | ||
1845 | return e_send_ack(w, tconn->agreed_pro_version >= 100 ? | |
1846 | P_RETRY_WRITE : P_DISCARD_WRITE); | |
1847 | } | |
1848 | ||
3e394da1 AG |
1849 | static bool seq_greater(u32 a, u32 b) |
1850 | { | |
1851 | /* | |
1852 | * We assume 32-bit wrap-around here. | |
1853 | * For 24-bit wrap-around, we would have to shift: | |
1854 | * a <<= 8; b <<= 8; | |
1855 | */ | |
1856 | return (s32)a - (s32)b > 0; | |
1857 | } | |
1858 | ||
1859 | static u32 seq_max(u32 a, u32 b) | |
1860 | { | |
1861 | return seq_greater(a, b) ? a : b; | |
1862 | } | |
1863 | ||
7be8da07 AG |
1864 | static bool need_peer_seq(struct drbd_conf *mdev) |
1865 | { | |
1866 | struct drbd_tconn *tconn = mdev->tconn; | |
302bdeae | 1867 | int tp; |
7be8da07 AG |
1868 | |
1869 | /* | |
1870 | * We only need to keep track of the last packet_seq number of our peer | |
1871 | * if we are in dual-primary mode and we have the discard flag set; see | |
1872 | * handle_write_conflicts(). | |
1873 | */ | |
302bdeae PR |
1874 | |
1875 | rcu_read_lock(); | |
1876 | tp = rcu_dereference(mdev->tconn->net_conf)->two_primaries; | |
1877 | rcu_read_unlock(); | |
1878 | ||
1879 | return tp && test_bit(DISCARD_CONCURRENT, &tconn->flags); | |
7be8da07 AG |
1880 | } |
1881 | ||
43ae077d | 1882 | static void update_peer_seq(struct drbd_conf *mdev, unsigned int peer_seq) |
3e394da1 | 1883 | { |
3c13b680 | 1884 | unsigned int newest_peer_seq; |
3e394da1 | 1885 | |
7be8da07 AG |
1886 | if (need_peer_seq(mdev)) { |
1887 | spin_lock(&mdev->peer_seq_lock); | |
3c13b680 LE |
1888 | newest_peer_seq = seq_max(mdev->peer_seq, peer_seq); |
1889 | mdev->peer_seq = newest_peer_seq; | |
7be8da07 | 1890 | spin_unlock(&mdev->peer_seq_lock); |
3c13b680 LE |
1891 | /* wake up only if we actually changed mdev->peer_seq */ |
1892 | if (peer_seq == newest_peer_seq) | |
7be8da07 AG |
1893 | wake_up(&mdev->seq_wait); |
1894 | } | |
3e394da1 AG |
1895 | } |
1896 | ||
b411b363 PR |
1897 | /* Called from receive_Data. |
1898 | * Synchronize packets on sock with packets on msock. | |
1899 | * | |
1900 | * This is here so even when a P_DATA packet traveling via sock overtook an Ack | |
1901 | * packet traveling on msock, they are still processed in the order they have | |
1902 | * been sent. | |
1903 | * | |
1904 | * Note: we don't care for Ack packets overtaking P_DATA packets. | |
1905 | * | |
1906 | * In case packet_seq is larger than mdev->peer_seq number, there are | |
1907 | * outstanding packets on the msock. We wait for them to arrive. | |
1908 | * In case we are the logically next packet, we update mdev->peer_seq | |
1909 | * ourselves. Correctly handles 32bit wrap around. | |
1910 | * | |
1911 | * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, | |
1912 | * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds | |
1913 | * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have | |
1914 | * 1<<9 == 512 seconds aka ages for the 32bit wrap around... | |
1915 | * | |
1916 | * returns 0 if we may process the packet, | |
1917 | * -ERESTARTSYS if we were interrupted (by disconnect signal). */ | |
7be8da07 | 1918 | static int wait_for_and_update_peer_seq(struct drbd_conf *mdev, const u32 peer_seq) |
b411b363 PR |
1919 | { |
1920 | DEFINE_WAIT(wait); | |
b411b363 | 1921 | long timeout; |
7be8da07 AG |
1922 | int ret; |
1923 | ||
1924 | if (!need_peer_seq(mdev)) | |
1925 | return 0; | |
1926 | ||
b411b363 PR |
1927 | spin_lock(&mdev->peer_seq_lock); |
1928 | for (;;) { | |
7be8da07 AG |
1929 | if (!seq_greater(peer_seq - 1, mdev->peer_seq)) { |
1930 | mdev->peer_seq = seq_max(mdev->peer_seq, peer_seq); | |
1931 | ret = 0; | |
b411b363 | 1932 | break; |
7be8da07 | 1933 | } |
b411b363 PR |
1934 | if (signal_pending(current)) { |
1935 | ret = -ERESTARTSYS; | |
1936 | break; | |
1937 | } | |
7be8da07 | 1938 | prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE); |
b411b363 | 1939 | spin_unlock(&mdev->peer_seq_lock); |
44ed167d PR |
1940 | rcu_read_lock(); |
1941 | timeout = rcu_dereference(mdev->tconn->net_conf)->ping_timeo*HZ/10; | |
1942 | rcu_read_unlock(); | |
71b1c1eb | 1943 | timeout = schedule_timeout(timeout); |
b411b363 | 1944 | spin_lock(&mdev->peer_seq_lock); |
7be8da07 | 1945 | if (!timeout) { |
b411b363 | 1946 | ret = -ETIMEDOUT; |
71b1c1eb | 1947 | dev_err(DEV, "Timed out waiting for missing ack packets; disconnecting\n"); |
b411b363 PR |
1948 | break; |
1949 | } | |
1950 | } | |
b411b363 | 1951 | spin_unlock(&mdev->peer_seq_lock); |
7be8da07 | 1952 | finish_wait(&mdev->seq_wait, &wait); |
b411b363 PR |
1953 | return ret; |
1954 | } | |
1955 | ||
688593c5 LE |
1956 | /* see also bio_flags_to_wire() |
1957 | * DRBD_REQ_*, because we need to semantically map the flags to data packet | |
1958 | * flags and back. We may replicate to other kernel versions. */ | |
1959 | static unsigned long wire_flags_to_bio(struct drbd_conf *mdev, u32 dpf) | |
76d2e7ec | 1960 | { |
688593c5 LE |
1961 | return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | |
1962 | (dpf & DP_FUA ? REQ_FUA : 0) | | |
1963 | (dpf & DP_FLUSH ? REQ_FLUSH : 0) | | |
1964 | (dpf & DP_DISCARD ? REQ_DISCARD : 0); | |
76d2e7ec PR |
1965 | } |
1966 | ||
7be8da07 AG |
1967 | static void fail_postponed_requests(struct drbd_conf *mdev, sector_t sector, |
1968 | unsigned int size) | |
1969 | { | |
1970 | struct drbd_interval *i; | |
1971 | ||
1972 | repeat: | |
1973 | drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { | |
1974 | struct drbd_request *req; | |
1975 | struct bio_and_error m; | |
1976 | ||
1977 | if (!i->local) | |
1978 | continue; | |
1979 | req = container_of(i, struct drbd_request, i); | |
1980 | if (!(req->rq_state & RQ_POSTPONED)) | |
1981 | continue; | |
1982 | req->rq_state &= ~RQ_POSTPONED; | |
1983 | __req_mod(req, NEG_ACKED, &m); | |
1984 | spin_unlock_irq(&mdev->tconn->req_lock); | |
1985 | if (m.bio) | |
1986 | complete_master_bio(mdev, &m); | |
1987 | spin_lock_irq(&mdev->tconn->req_lock); | |
1988 | goto repeat; | |
1989 | } | |
1990 | } | |
1991 | ||
1992 | static int handle_write_conflicts(struct drbd_conf *mdev, | |
1993 | struct drbd_peer_request *peer_req) | |
1994 | { | |
1995 | struct drbd_tconn *tconn = mdev->tconn; | |
1996 | bool resolve_conflicts = test_bit(DISCARD_CONCURRENT, &tconn->flags); | |
1997 | sector_t sector = peer_req->i.sector; | |
1998 | const unsigned int size = peer_req->i.size; | |
1999 | struct drbd_interval *i; | |
2000 | bool equal; | |
2001 | int err; | |
2002 | ||
2003 | /* | |
2004 | * Inserting the peer request into the write_requests tree will prevent | |
2005 | * new conflicting local requests from being added. | |
2006 | */ | |
2007 | drbd_insert_interval(&mdev->write_requests, &peer_req->i); | |
2008 | ||
2009 | repeat: | |
2010 | drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { | |
2011 | if (i == &peer_req->i) | |
2012 | continue; | |
2013 | ||
2014 | if (!i->local) { | |
2015 | /* | |
2016 | * Our peer has sent a conflicting remote request; this | |
2017 | * should not happen in a two-node setup. Wait for the | |
2018 | * earlier peer request to complete. | |
2019 | */ | |
2020 | err = drbd_wait_misc(mdev, i); | |
2021 | if (err) | |
2022 | goto out; | |
2023 | goto repeat; | |
2024 | } | |
2025 | ||
2026 | equal = i->sector == sector && i->size == size; | |
2027 | if (resolve_conflicts) { | |
2028 | /* | |
2029 | * If the peer request is fully contained within the | |
2030 | * overlapping request, it can be discarded; otherwise, | |
2031 | * it will be retried once all overlapping requests | |
2032 | * have completed. | |
2033 | */ | |
2034 | bool discard = i->sector <= sector && i->sector + | |
2035 | (i->size >> 9) >= sector + (size >> 9); | |
2036 | ||
2037 | if (!equal) | |
2038 | dev_alert(DEV, "Concurrent writes detected: " | |
2039 | "local=%llus +%u, remote=%llus +%u, " | |
2040 | "assuming %s came first\n", | |
2041 | (unsigned long long)i->sector, i->size, | |
2042 | (unsigned long long)sector, size, | |
2043 | discard ? "local" : "remote"); | |
2044 | ||
2045 | inc_unacked(mdev); | |
2046 | peer_req->w.cb = discard ? e_send_discard_write : | |
2047 | e_send_retry_write; | |
2048 | list_add_tail(&peer_req->w.list, &mdev->done_ee); | |
2049 | wake_asender(mdev->tconn); | |
2050 | ||
2051 | err = -ENOENT; | |
2052 | goto out; | |
2053 | } else { | |
2054 | struct drbd_request *req = | |
2055 | container_of(i, struct drbd_request, i); | |
2056 | ||
2057 | if (!equal) | |
2058 | dev_alert(DEV, "Concurrent writes detected: " | |
2059 | "local=%llus +%u, remote=%llus +%u\n", | |
2060 | (unsigned long long)i->sector, i->size, | |
2061 | (unsigned long long)sector, size); | |
2062 | ||
2063 | if (req->rq_state & RQ_LOCAL_PENDING || | |
2064 | !(req->rq_state & RQ_POSTPONED)) { | |
2065 | /* | |
2066 | * Wait for the node with the discard flag to | |
2067 | * decide if this request will be discarded or | |
2068 | * retried. Requests that are discarded will | |
2069 | * disappear from the write_requests tree. | |
2070 | * | |
2071 | * In addition, wait for the conflicting | |
2072 | * request to finish locally before submitting | |
2073 | * the conflicting peer request. | |
2074 | */ | |
2075 | err = drbd_wait_misc(mdev, &req->i); | |
2076 | if (err) { | |
2077 | _conn_request_state(mdev->tconn, | |
2078 | NS(conn, C_TIMEOUT), | |
2079 | CS_HARD); | |
2080 | fail_postponed_requests(mdev, sector, size); | |
2081 | goto out; | |
2082 | } | |
2083 | goto repeat; | |
2084 | } | |
2085 | /* | |
2086 | * Remember to restart the conflicting requests after | |
2087 | * the new peer request has completed. | |
2088 | */ | |
2089 | peer_req->flags |= EE_RESTART_REQUESTS; | |
2090 | } | |
2091 | } | |
2092 | err = 0; | |
2093 | ||
2094 | out: | |
2095 | if (err) | |
2096 | drbd_remove_epoch_entry_interval(mdev, peer_req); | |
2097 | return err; | |
2098 | } | |
2099 | ||
b411b363 | 2100 | /* mirrored write */ |
4a76b161 | 2101 | static int receive_Data(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 2102 | { |
4a76b161 | 2103 | struct drbd_conf *mdev; |
b411b363 | 2104 | sector_t sector; |
db830c46 | 2105 | struct drbd_peer_request *peer_req; |
e658983a | 2106 | struct p_data *p = pi->data; |
7be8da07 | 2107 | u32 peer_seq = be32_to_cpu(p->seq_num); |
b411b363 PR |
2108 | int rw = WRITE; |
2109 | u32 dp_flags; | |
302bdeae | 2110 | int err, tp; |
b411b363 | 2111 | |
4a76b161 AG |
2112 | mdev = vnr_to_mdev(tconn, pi->vnr); |
2113 | if (!mdev) | |
2114 | return -EIO; | |
2115 | ||
7be8da07 | 2116 | if (!get_ldev(mdev)) { |
82bc0194 AG |
2117 | int err2; |
2118 | ||
7be8da07 | 2119 | err = wait_for_and_update_peer_seq(mdev, peer_seq); |
e2857216 | 2120 | drbd_send_ack_dp(mdev, P_NEG_ACK, p, pi->size); |
12038a3a | 2121 | atomic_inc(&tconn->current_epoch->epoch_size); |
e2857216 | 2122 | err2 = drbd_drain_block(mdev, pi->size); |
82bc0194 AG |
2123 | if (!err) |
2124 | err = err2; | |
2125 | return err; | |
b411b363 PR |
2126 | } |
2127 | ||
fcefa62e AG |
2128 | /* |
2129 | * Corresponding put_ldev done either below (on various errors), or in | |
2130 | * drbd_peer_request_endio, if we successfully submit the data at the | |
2131 | * end of this function. | |
2132 | */ | |
b411b363 PR |
2133 | |
2134 | sector = be64_to_cpu(p->sector); | |
e2857216 | 2135 | peer_req = read_in_block(mdev, p->block_id, sector, pi->size); |
db830c46 | 2136 | if (!peer_req) { |
b411b363 | 2137 | put_ldev(mdev); |
82bc0194 | 2138 | return -EIO; |
b411b363 PR |
2139 | } |
2140 | ||
db830c46 | 2141 | peer_req->w.cb = e_end_block; |
b411b363 | 2142 | |
688593c5 LE |
2143 | dp_flags = be32_to_cpu(p->dp_flags); |
2144 | rw |= wire_flags_to_bio(mdev, dp_flags); | |
2145 | ||
2146 | if (dp_flags & DP_MAY_SET_IN_SYNC) | |
db830c46 | 2147 | peer_req->flags |= EE_MAY_SET_IN_SYNC; |
688593c5 | 2148 | |
12038a3a PR |
2149 | spin_lock(&tconn->epoch_lock); |
2150 | peer_req->epoch = tconn->current_epoch; | |
db830c46 AG |
2151 | atomic_inc(&peer_req->epoch->epoch_size); |
2152 | atomic_inc(&peer_req->epoch->active); | |
12038a3a | 2153 | spin_unlock(&tconn->epoch_lock); |
b411b363 | 2154 | |
302bdeae PR |
2155 | rcu_read_lock(); |
2156 | tp = rcu_dereference(mdev->tconn->net_conf)->two_primaries; | |
2157 | rcu_read_unlock(); | |
2158 | if (tp) { | |
2159 | peer_req->flags |= EE_IN_INTERVAL_TREE; | |
7be8da07 AG |
2160 | err = wait_for_and_update_peer_seq(mdev, peer_seq); |
2161 | if (err) | |
b411b363 | 2162 | goto out_interrupted; |
87eeee41 | 2163 | spin_lock_irq(&mdev->tconn->req_lock); |
7be8da07 AG |
2164 | err = handle_write_conflicts(mdev, peer_req); |
2165 | if (err) { | |
2166 | spin_unlock_irq(&mdev->tconn->req_lock); | |
2167 | if (err == -ENOENT) { | |
b411b363 | 2168 | put_ldev(mdev); |
82bc0194 | 2169 | return 0; |
b411b363 | 2170 | } |
7be8da07 | 2171 | goto out_interrupted; |
b411b363 | 2172 | } |
7be8da07 AG |
2173 | } else |
2174 | spin_lock_irq(&mdev->tconn->req_lock); | |
db830c46 | 2175 | list_add(&peer_req->w.list, &mdev->active_ee); |
87eeee41 | 2176 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 2177 | |
303d1448 | 2178 | if (mdev->tconn->agreed_pro_version < 100) { |
44ed167d PR |
2179 | rcu_read_lock(); |
2180 | switch (rcu_dereference(mdev->tconn->net_conf)->wire_protocol) { | |
303d1448 PR |
2181 | case DRBD_PROT_C: |
2182 | dp_flags |= DP_SEND_WRITE_ACK; | |
2183 | break; | |
2184 | case DRBD_PROT_B: | |
2185 | dp_flags |= DP_SEND_RECEIVE_ACK; | |
2186 | break; | |
2187 | } | |
44ed167d | 2188 | rcu_read_unlock(); |
303d1448 PR |
2189 | } |
2190 | ||
2191 | if (dp_flags & DP_SEND_WRITE_ACK) { | |
2192 | peer_req->flags |= EE_SEND_WRITE_ACK; | |
b411b363 PR |
2193 | inc_unacked(mdev); |
2194 | /* corresponding dec_unacked() in e_end_block() | |
2195 | * respective _drbd_clear_done_ee */ | |
303d1448 PR |
2196 | } |
2197 | ||
2198 | if (dp_flags & DP_SEND_RECEIVE_ACK) { | |
b411b363 PR |
2199 | /* I really don't like it that the receiver thread |
2200 | * sends on the msock, but anyways */ | |
db830c46 | 2201 | drbd_send_ack(mdev, P_RECV_ACK, peer_req); |
b411b363 PR |
2202 | } |
2203 | ||
6719fb03 | 2204 | if (mdev->state.pdsk < D_INCONSISTENT) { |
b411b363 | 2205 | /* In case we have the only disk of the cluster, */ |
db830c46 AG |
2206 | drbd_set_out_of_sync(mdev, peer_req->i.sector, peer_req->i.size); |
2207 | peer_req->flags |= EE_CALL_AL_COMPLETE_IO; | |
2208 | peer_req->flags &= ~EE_MAY_SET_IN_SYNC; | |
181286ad | 2209 | drbd_al_begin_io(mdev, &peer_req->i); |
b411b363 PR |
2210 | } |
2211 | ||
82bc0194 AG |
2212 | err = drbd_submit_peer_request(mdev, peer_req, rw, DRBD_FAULT_DT_WR); |
2213 | if (!err) | |
2214 | return 0; | |
b411b363 | 2215 | |
10f6d992 LE |
2216 | /* don't care for the reason here */ |
2217 | dev_err(DEV, "submit failed, triggering re-connect\n"); | |
87eeee41 | 2218 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 AG |
2219 | list_del(&peer_req->w.list); |
2220 | drbd_remove_epoch_entry_interval(mdev, peer_req); | |
87eeee41 | 2221 | spin_unlock_irq(&mdev->tconn->req_lock); |
db830c46 | 2222 | if (peer_req->flags & EE_CALL_AL_COMPLETE_IO) |
181286ad | 2223 | drbd_al_complete_io(mdev, &peer_req->i); |
22cc37a9 | 2224 | |
b411b363 | 2225 | out_interrupted: |
1e9dd291 | 2226 | drbd_may_finish_epoch(tconn, peer_req->epoch, EV_PUT + EV_CLEANUP); |
b411b363 | 2227 | put_ldev(mdev); |
3967deb1 | 2228 | drbd_free_peer_req(mdev, peer_req); |
82bc0194 | 2229 | return err; |
b411b363 PR |
2230 | } |
2231 | ||
0f0601f4 LE |
2232 | /* We may throttle resync, if the lower device seems to be busy, |
2233 | * and current sync rate is above c_min_rate. | |
2234 | * | |
2235 | * To decide whether or not the lower device is busy, we use a scheme similar | |
2236 | * to MD RAID is_mddev_idle(): if the partition stats reveal "significant" | |
2237 | * (more than 64 sectors) of activity we cannot account for with our own resync | |
2238 | * activity, it obviously is "busy". | |
2239 | * | |
2240 | * The current sync rate used here uses only the most recent two step marks, | |
2241 | * to have a short time average so we can react faster. | |
2242 | */ | |
e3555d85 | 2243 | int drbd_rs_should_slow_down(struct drbd_conf *mdev, sector_t sector) |
0f0601f4 LE |
2244 | { |
2245 | struct gendisk *disk = mdev->ldev->backing_bdev->bd_contains->bd_disk; | |
2246 | unsigned long db, dt, dbdt; | |
e3555d85 | 2247 | struct lc_element *tmp; |
0f0601f4 LE |
2248 | int curr_events; |
2249 | int throttle = 0; | |
daeda1cc PR |
2250 | unsigned int c_min_rate; |
2251 | ||
2252 | rcu_read_lock(); | |
2253 | c_min_rate = rcu_dereference(mdev->ldev->disk_conf)->c_min_rate; | |
2254 | rcu_read_unlock(); | |
0f0601f4 LE |
2255 | |
2256 | /* feature disabled? */ | |
daeda1cc | 2257 | if (c_min_rate == 0) |
0f0601f4 LE |
2258 | return 0; |
2259 | ||
e3555d85 PR |
2260 | spin_lock_irq(&mdev->al_lock); |
2261 | tmp = lc_find(mdev->resync, BM_SECT_TO_EXT(sector)); | |
2262 | if (tmp) { | |
2263 | struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); | |
2264 | if (test_bit(BME_PRIORITY, &bm_ext->flags)) { | |
2265 | spin_unlock_irq(&mdev->al_lock); | |
2266 | return 0; | |
2267 | } | |
2268 | /* Do not slow down if app IO is already waiting for this extent */ | |
2269 | } | |
2270 | spin_unlock_irq(&mdev->al_lock); | |
2271 | ||
0f0601f4 LE |
2272 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
2273 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
2274 | atomic_read(&mdev->rs_sect_ev); | |
e3555d85 | 2275 | |
0f0601f4 LE |
2276 | if (!mdev->rs_last_events || curr_events - mdev->rs_last_events > 64) { |
2277 | unsigned long rs_left; | |
2278 | int i; | |
2279 | ||
2280 | mdev->rs_last_events = curr_events; | |
2281 | ||
2282 | /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, | |
2283 | * approx. */ | |
2649f080 LE |
2284 | i = (mdev->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; |
2285 | ||
2286 | if (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T) | |
2287 | rs_left = mdev->ov_left; | |
2288 | else | |
2289 | rs_left = drbd_bm_total_weight(mdev) - mdev->rs_failed; | |
0f0601f4 LE |
2290 | |
2291 | dt = ((long)jiffies - (long)mdev->rs_mark_time[i]) / HZ; | |
2292 | if (!dt) | |
2293 | dt++; | |
2294 | db = mdev->rs_mark_left[i] - rs_left; | |
2295 | dbdt = Bit2KB(db/dt); | |
2296 | ||
daeda1cc | 2297 | if (dbdt > c_min_rate) |
0f0601f4 LE |
2298 | throttle = 1; |
2299 | } | |
2300 | return throttle; | |
2301 | } | |
2302 | ||
2303 | ||
4a76b161 | 2304 | static int receive_DataRequest(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 2305 | { |
4a76b161 | 2306 | struct drbd_conf *mdev; |
b411b363 | 2307 | sector_t sector; |
4a76b161 | 2308 | sector_t capacity; |
db830c46 | 2309 | struct drbd_peer_request *peer_req; |
b411b363 | 2310 | struct digest_info *di = NULL; |
b18b37be | 2311 | int size, verb; |
b411b363 | 2312 | unsigned int fault_type; |
e658983a | 2313 | struct p_block_req *p = pi->data; |
4a76b161 AG |
2314 | |
2315 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
2316 | if (!mdev) | |
2317 | return -EIO; | |
2318 | capacity = drbd_get_capacity(mdev->this_bdev); | |
b411b363 PR |
2319 | |
2320 | sector = be64_to_cpu(p->sector); | |
2321 | size = be32_to_cpu(p->blksize); | |
2322 | ||
c670a398 | 2323 | if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) { |
b411b363 PR |
2324 | dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, |
2325 | (unsigned long long)sector, size); | |
82bc0194 | 2326 | return -EINVAL; |
b411b363 PR |
2327 | } |
2328 | if (sector + (size>>9) > capacity) { | |
2329 | dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, | |
2330 | (unsigned long long)sector, size); | |
82bc0194 | 2331 | return -EINVAL; |
b411b363 PR |
2332 | } |
2333 | ||
2334 | if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) { | |
b18b37be | 2335 | verb = 1; |
e2857216 | 2336 | switch (pi->cmd) { |
b18b37be PR |
2337 | case P_DATA_REQUEST: |
2338 | drbd_send_ack_rp(mdev, P_NEG_DREPLY, p); | |
2339 | break; | |
2340 | case P_RS_DATA_REQUEST: | |
2341 | case P_CSUM_RS_REQUEST: | |
2342 | case P_OV_REQUEST: | |
2343 | drbd_send_ack_rp(mdev, P_NEG_RS_DREPLY , p); | |
2344 | break; | |
2345 | case P_OV_REPLY: | |
2346 | verb = 0; | |
2347 | dec_rs_pending(mdev); | |
2348 | drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, ID_IN_SYNC); | |
2349 | break; | |
2350 | default: | |
49ba9b1b | 2351 | BUG(); |
b18b37be PR |
2352 | } |
2353 | if (verb && __ratelimit(&drbd_ratelimit_state)) | |
b411b363 PR |
2354 | dev_err(DEV, "Can not satisfy peer's read request, " |
2355 | "no local data.\n"); | |
b18b37be | 2356 | |
a821cc4a | 2357 | /* drain possibly payload */ |
e2857216 | 2358 | return drbd_drain_block(mdev, pi->size); |
b411b363 PR |
2359 | } |
2360 | ||
2361 | /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD | |
2362 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
2363 | * which in turn might block on the other node at this very place. */ | |
0db55363 | 2364 | peer_req = drbd_alloc_peer_req(mdev, p->block_id, sector, size, GFP_NOIO); |
db830c46 | 2365 | if (!peer_req) { |
b411b363 | 2366 | put_ldev(mdev); |
82bc0194 | 2367 | return -ENOMEM; |
b411b363 PR |
2368 | } |
2369 | ||
e2857216 | 2370 | switch (pi->cmd) { |
b411b363 | 2371 | case P_DATA_REQUEST: |
db830c46 | 2372 | peer_req->w.cb = w_e_end_data_req; |
b411b363 | 2373 | fault_type = DRBD_FAULT_DT_RD; |
80a40e43 LE |
2374 | /* application IO, don't drbd_rs_begin_io */ |
2375 | goto submit; | |
2376 | ||
b411b363 | 2377 | case P_RS_DATA_REQUEST: |
db830c46 | 2378 | peer_req->w.cb = w_e_end_rsdata_req; |
b411b363 | 2379 | fault_type = DRBD_FAULT_RS_RD; |
5f9915bb LE |
2380 | /* used in the sector offset progress display */ |
2381 | mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); | |
b411b363 PR |
2382 | break; |
2383 | ||
2384 | case P_OV_REPLY: | |
2385 | case P_CSUM_RS_REQUEST: | |
2386 | fault_type = DRBD_FAULT_RS_RD; | |
e2857216 | 2387 | di = kmalloc(sizeof(*di) + pi->size, GFP_NOIO); |
b411b363 PR |
2388 | if (!di) |
2389 | goto out_free_e; | |
2390 | ||
e2857216 | 2391 | di->digest_size = pi->size; |
b411b363 PR |
2392 | di->digest = (((char *)di)+sizeof(struct digest_info)); |
2393 | ||
db830c46 AG |
2394 | peer_req->digest = di; |
2395 | peer_req->flags |= EE_HAS_DIGEST; | |
c36c3ced | 2396 | |
e2857216 | 2397 | if (drbd_recv_all(mdev->tconn, di->digest, pi->size)) |
b411b363 PR |
2398 | goto out_free_e; |
2399 | ||
e2857216 | 2400 | if (pi->cmd == P_CSUM_RS_REQUEST) { |
31890f4a | 2401 | D_ASSERT(mdev->tconn->agreed_pro_version >= 89); |
db830c46 | 2402 | peer_req->w.cb = w_e_end_csum_rs_req; |
5f9915bb LE |
2403 | /* used in the sector offset progress display */ |
2404 | mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); | |
e2857216 | 2405 | } else if (pi->cmd == P_OV_REPLY) { |
2649f080 LE |
2406 | /* track progress, we may need to throttle */ |
2407 | atomic_add(size >> 9, &mdev->rs_sect_in); | |
db830c46 | 2408 | peer_req->w.cb = w_e_end_ov_reply; |
b411b363 | 2409 | dec_rs_pending(mdev); |
0f0601f4 LE |
2410 | /* drbd_rs_begin_io done when we sent this request, |
2411 | * but accounting still needs to be done. */ | |
2412 | goto submit_for_resync; | |
b411b363 PR |
2413 | } |
2414 | break; | |
2415 | ||
2416 | case P_OV_REQUEST: | |
b411b363 | 2417 | if (mdev->ov_start_sector == ~(sector_t)0 && |
31890f4a | 2418 | mdev->tconn->agreed_pro_version >= 90) { |
de228bba LE |
2419 | unsigned long now = jiffies; |
2420 | int i; | |
b411b363 PR |
2421 | mdev->ov_start_sector = sector; |
2422 | mdev->ov_position = sector; | |
30b743a2 LE |
2423 | mdev->ov_left = drbd_bm_bits(mdev) - BM_SECT_TO_BIT(sector); |
2424 | mdev->rs_total = mdev->ov_left; | |
de228bba LE |
2425 | for (i = 0; i < DRBD_SYNC_MARKS; i++) { |
2426 | mdev->rs_mark_left[i] = mdev->ov_left; | |
2427 | mdev->rs_mark_time[i] = now; | |
2428 | } | |
b411b363 PR |
2429 | dev_info(DEV, "Online Verify start sector: %llu\n", |
2430 | (unsigned long long)sector); | |
2431 | } | |
db830c46 | 2432 | peer_req->w.cb = w_e_end_ov_req; |
b411b363 | 2433 | fault_type = DRBD_FAULT_RS_RD; |
b411b363 PR |
2434 | break; |
2435 | ||
b411b363 | 2436 | default: |
49ba9b1b | 2437 | BUG(); |
b411b363 PR |
2438 | } |
2439 | ||
0f0601f4 LE |
2440 | /* Throttle, drbd_rs_begin_io and submit should become asynchronous |
2441 | * wrt the receiver, but it is not as straightforward as it may seem. | |
2442 | * Various places in the resync start and stop logic assume resync | |
2443 | * requests are processed in order, requeuing this on the worker thread | |
2444 | * introduces a bunch of new code for synchronization between threads. | |
2445 | * | |
2446 | * Unlimited throttling before drbd_rs_begin_io may stall the resync | |
2447 | * "forever", throttling after drbd_rs_begin_io will lock that extent | |
2448 | * for application writes for the same time. For now, just throttle | |
2449 | * here, where the rest of the code expects the receiver to sleep for | |
2450 | * a while, anyways. | |
2451 | */ | |
2452 | ||
2453 | /* Throttle before drbd_rs_begin_io, as that locks out application IO; | |
2454 | * this defers syncer requests for some time, before letting at least | |
2455 | * on request through. The resync controller on the receiving side | |
2456 | * will adapt to the incoming rate accordingly. | |
2457 | * | |
2458 | * We cannot throttle here if remote is Primary/SyncTarget: | |
2459 | * we would also throttle its application reads. | |
2460 | * In that case, throttling is done on the SyncTarget only. | |
2461 | */ | |
e3555d85 PR |
2462 | if (mdev->state.peer != R_PRIMARY && drbd_rs_should_slow_down(mdev, sector)) |
2463 | schedule_timeout_uninterruptible(HZ/10); | |
2464 | if (drbd_rs_begin_io(mdev, sector)) | |
80a40e43 | 2465 | goto out_free_e; |
b411b363 | 2466 | |
0f0601f4 LE |
2467 | submit_for_resync: |
2468 | atomic_add(size >> 9, &mdev->rs_sect_ev); | |
2469 | ||
80a40e43 | 2470 | submit: |
b411b363 | 2471 | inc_unacked(mdev); |
87eeee41 | 2472 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 | 2473 | list_add_tail(&peer_req->w.list, &mdev->read_ee); |
87eeee41 | 2474 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 2475 | |
fbe29dec | 2476 | if (drbd_submit_peer_request(mdev, peer_req, READ, fault_type) == 0) |
82bc0194 | 2477 | return 0; |
b411b363 | 2478 | |
10f6d992 LE |
2479 | /* don't care for the reason here */ |
2480 | dev_err(DEV, "submit failed, triggering re-connect\n"); | |
87eeee41 | 2481 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 | 2482 | list_del(&peer_req->w.list); |
87eeee41 | 2483 | spin_unlock_irq(&mdev->tconn->req_lock); |
22cc37a9 LE |
2484 | /* no drbd_rs_complete_io(), we are dropping the connection anyways */ |
2485 | ||
b411b363 | 2486 | out_free_e: |
b411b363 | 2487 | put_ldev(mdev); |
3967deb1 | 2488 | drbd_free_peer_req(mdev, peer_req); |
82bc0194 | 2489 | return -EIO; |
b411b363 PR |
2490 | } |
2491 | ||
2492 | static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local) | |
2493 | { | |
2494 | int self, peer, rv = -100; | |
2495 | unsigned long ch_self, ch_peer; | |
44ed167d | 2496 | enum drbd_after_sb_p after_sb_0p; |
b411b363 PR |
2497 | |
2498 | self = mdev->ldev->md.uuid[UI_BITMAP] & 1; | |
2499 | peer = mdev->p_uuid[UI_BITMAP] & 1; | |
2500 | ||
2501 | ch_peer = mdev->p_uuid[UI_SIZE]; | |
2502 | ch_self = mdev->comm_bm_set; | |
2503 | ||
44ed167d PR |
2504 | rcu_read_lock(); |
2505 | after_sb_0p = rcu_dereference(mdev->tconn->net_conf)->after_sb_0p; | |
2506 | rcu_read_unlock(); | |
2507 | switch (after_sb_0p) { | |
b411b363 PR |
2508 | case ASB_CONSENSUS: |
2509 | case ASB_DISCARD_SECONDARY: | |
2510 | case ASB_CALL_HELPER: | |
44ed167d | 2511 | case ASB_VIOLENTLY: |
b411b363 PR |
2512 | dev_err(DEV, "Configuration error.\n"); |
2513 | break; | |
2514 | case ASB_DISCONNECT: | |
2515 | break; | |
2516 | case ASB_DISCARD_YOUNGER_PRI: | |
2517 | if (self == 0 && peer == 1) { | |
2518 | rv = -1; | |
2519 | break; | |
2520 | } | |
2521 | if (self == 1 && peer == 0) { | |
2522 | rv = 1; | |
2523 | break; | |
2524 | } | |
2525 | /* Else fall through to one of the other strategies... */ | |
2526 | case ASB_DISCARD_OLDER_PRI: | |
2527 | if (self == 0 && peer == 1) { | |
2528 | rv = 1; | |
2529 | break; | |
2530 | } | |
2531 | if (self == 1 && peer == 0) { | |
2532 | rv = -1; | |
2533 | break; | |
2534 | } | |
2535 | /* Else fall through to one of the other strategies... */ | |
ad19bf6e | 2536 | dev_warn(DEV, "Discard younger/older primary did not find a decision\n" |
b411b363 PR |
2537 | "Using discard-least-changes instead\n"); |
2538 | case ASB_DISCARD_ZERO_CHG: | |
2539 | if (ch_peer == 0 && ch_self == 0) { | |
25703f83 | 2540 | rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) |
b411b363 PR |
2541 | ? -1 : 1; |
2542 | break; | |
2543 | } else { | |
2544 | if (ch_peer == 0) { rv = 1; break; } | |
2545 | if (ch_self == 0) { rv = -1; break; } | |
2546 | } | |
44ed167d | 2547 | if (after_sb_0p == ASB_DISCARD_ZERO_CHG) |
b411b363 PR |
2548 | break; |
2549 | case ASB_DISCARD_LEAST_CHG: | |
2550 | if (ch_self < ch_peer) | |
2551 | rv = -1; | |
2552 | else if (ch_self > ch_peer) | |
2553 | rv = 1; | |
2554 | else /* ( ch_self == ch_peer ) */ | |
2555 | /* Well, then use something else. */ | |
25703f83 | 2556 | rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) |
b411b363 PR |
2557 | ? -1 : 1; |
2558 | break; | |
2559 | case ASB_DISCARD_LOCAL: | |
2560 | rv = -1; | |
2561 | break; | |
2562 | case ASB_DISCARD_REMOTE: | |
2563 | rv = 1; | |
2564 | } | |
2565 | ||
2566 | return rv; | |
2567 | } | |
2568 | ||
2569 | static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local) | |
2570 | { | |
6184ea21 | 2571 | int hg, rv = -100; |
44ed167d | 2572 | enum drbd_after_sb_p after_sb_1p; |
b411b363 | 2573 | |
44ed167d PR |
2574 | rcu_read_lock(); |
2575 | after_sb_1p = rcu_dereference(mdev->tconn->net_conf)->after_sb_1p; | |
2576 | rcu_read_unlock(); | |
2577 | switch (after_sb_1p) { | |
b411b363 PR |
2578 | case ASB_DISCARD_YOUNGER_PRI: |
2579 | case ASB_DISCARD_OLDER_PRI: | |
2580 | case ASB_DISCARD_LEAST_CHG: | |
2581 | case ASB_DISCARD_LOCAL: | |
2582 | case ASB_DISCARD_REMOTE: | |
44ed167d | 2583 | case ASB_DISCARD_ZERO_CHG: |
b411b363 PR |
2584 | dev_err(DEV, "Configuration error.\n"); |
2585 | break; | |
2586 | case ASB_DISCONNECT: | |
2587 | break; | |
2588 | case ASB_CONSENSUS: | |
2589 | hg = drbd_asb_recover_0p(mdev); | |
2590 | if (hg == -1 && mdev->state.role == R_SECONDARY) | |
2591 | rv = hg; | |
2592 | if (hg == 1 && mdev->state.role == R_PRIMARY) | |
2593 | rv = hg; | |
2594 | break; | |
2595 | case ASB_VIOLENTLY: | |
2596 | rv = drbd_asb_recover_0p(mdev); | |
2597 | break; | |
2598 | case ASB_DISCARD_SECONDARY: | |
2599 | return mdev->state.role == R_PRIMARY ? 1 : -1; | |
2600 | case ASB_CALL_HELPER: | |
2601 | hg = drbd_asb_recover_0p(mdev); | |
2602 | if (hg == -1 && mdev->state.role == R_PRIMARY) { | |
bb437946 AG |
2603 | enum drbd_state_rv rv2; |
2604 | ||
2605 | drbd_set_role(mdev, R_SECONDARY, 0); | |
b411b363 PR |
2606 | /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, |
2607 | * we might be here in C_WF_REPORT_PARAMS which is transient. | |
2608 | * we do not need to wait for the after state change work either. */ | |
bb437946 AG |
2609 | rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); |
2610 | if (rv2 != SS_SUCCESS) { | |
b411b363 PR |
2611 | drbd_khelper(mdev, "pri-lost-after-sb"); |
2612 | } else { | |
2613 | dev_warn(DEV, "Successfully gave up primary role.\n"); | |
2614 | rv = hg; | |
2615 | } | |
2616 | } else | |
2617 | rv = hg; | |
2618 | } | |
2619 | ||
2620 | return rv; | |
2621 | } | |
2622 | ||
2623 | static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local) | |
2624 | { | |
6184ea21 | 2625 | int hg, rv = -100; |
44ed167d | 2626 | enum drbd_after_sb_p after_sb_2p; |
b411b363 | 2627 | |
44ed167d PR |
2628 | rcu_read_lock(); |
2629 | after_sb_2p = rcu_dereference(mdev->tconn->net_conf)->after_sb_2p; | |
2630 | rcu_read_unlock(); | |
2631 | switch (after_sb_2p) { | |
b411b363 PR |
2632 | case ASB_DISCARD_YOUNGER_PRI: |
2633 | case ASB_DISCARD_OLDER_PRI: | |
2634 | case ASB_DISCARD_LEAST_CHG: | |
2635 | case ASB_DISCARD_LOCAL: | |
2636 | case ASB_DISCARD_REMOTE: | |
2637 | case ASB_CONSENSUS: | |
2638 | case ASB_DISCARD_SECONDARY: | |
44ed167d | 2639 | case ASB_DISCARD_ZERO_CHG: |
b411b363 PR |
2640 | dev_err(DEV, "Configuration error.\n"); |
2641 | break; | |
2642 | case ASB_VIOLENTLY: | |
2643 | rv = drbd_asb_recover_0p(mdev); | |
2644 | break; | |
2645 | case ASB_DISCONNECT: | |
2646 | break; | |
2647 | case ASB_CALL_HELPER: | |
2648 | hg = drbd_asb_recover_0p(mdev); | |
2649 | if (hg == -1) { | |
bb437946 AG |
2650 | enum drbd_state_rv rv2; |
2651 | ||
b411b363 PR |
2652 | /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, |
2653 | * we might be here in C_WF_REPORT_PARAMS which is transient. | |
2654 | * we do not need to wait for the after state change work either. */ | |
bb437946 AG |
2655 | rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); |
2656 | if (rv2 != SS_SUCCESS) { | |
b411b363 PR |
2657 | drbd_khelper(mdev, "pri-lost-after-sb"); |
2658 | } else { | |
2659 | dev_warn(DEV, "Successfully gave up primary role.\n"); | |
2660 | rv = hg; | |
2661 | } | |
2662 | } else | |
2663 | rv = hg; | |
2664 | } | |
2665 | ||
2666 | return rv; | |
2667 | } | |
2668 | ||
2669 | static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid, | |
2670 | u64 bits, u64 flags) | |
2671 | { | |
2672 | if (!uuid) { | |
2673 | dev_info(DEV, "%s uuid info vanished while I was looking!\n", text); | |
2674 | return; | |
2675 | } | |
2676 | dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", | |
2677 | text, | |
2678 | (unsigned long long)uuid[UI_CURRENT], | |
2679 | (unsigned long long)uuid[UI_BITMAP], | |
2680 | (unsigned long long)uuid[UI_HISTORY_START], | |
2681 | (unsigned long long)uuid[UI_HISTORY_END], | |
2682 | (unsigned long long)bits, | |
2683 | (unsigned long long)flags); | |
2684 | } | |
2685 | ||
2686 | /* | |
2687 | 100 after split brain try auto recover | |
2688 | 2 C_SYNC_SOURCE set BitMap | |
2689 | 1 C_SYNC_SOURCE use BitMap | |
2690 | 0 no Sync | |
2691 | -1 C_SYNC_TARGET use BitMap | |
2692 | -2 C_SYNC_TARGET set BitMap | |
2693 | -100 after split brain, disconnect | |
2694 | -1000 unrelated data | |
4a23f264 PR |
2695 | -1091 requires proto 91 |
2696 | -1096 requires proto 96 | |
b411b363 PR |
2697 | */ |
2698 | static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local) | |
2699 | { | |
2700 | u64 self, peer; | |
2701 | int i, j; | |
2702 | ||
2703 | self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); | |
2704 | peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); | |
2705 | ||
2706 | *rule_nr = 10; | |
2707 | if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) | |
2708 | return 0; | |
2709 | ||
2710 | *rule_nr = 20; | |
2711 | if ((self == UUID_JUST_CREATED || self == (u64)0) && | |
2712 | peer != UUID_JUST_CREATED) | |
2713 | return -2; | |
2714 | ||
2715 | *rule_nr = 30; | |
2716 | if (self != UUID_JUST_CREATED && | |
2717 | (peer == UUID_JUST_CREATED || peer == (u64)0)) | |
2718 | return 2; | |
2719 | ||
2720 | if (self == peer) { | |
2721 | int rct, dc; /* roles at crash time */ | |
2722 | ||
2723 | if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) { | |
2724 | ||
31890f4a | 2725 | if (mdev->tconn->agreed_pro_version < 91) |
4a23f264 | 2726 | return -1091; |
b411b363 PR |
2727 | |
2728 | if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) && | |
2729 | (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { | |
2730 | dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n"); | |
2731 | drbd_uuid_set_bm(mdev, 0UL); | |
2732 | ||
2733 | drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, | |
2734 | mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); | |
2735 | *rule_nr = 34; | |
2736 | } else { | |
2737 | dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n"); | |
2738 | *rule_nr = 36; | |
2739 | } | |
2740 | ||
2741 | return 1; | |
2742 | } | |
2743 | ||
2744 | if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) { | |
2745 | ||
31890f4a | 2746 | if (mdev->tconn->agreed_pro_version < 91) |
4a23f264 | 2747 | return -1091; |
b411b363 PR |
2748 | |
2749 | if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) && | |
2750 | (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) { | |
2751 | dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); | |
2752 | ||
2753 | mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START]; | |
2754 | mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP]; | |
2755 | mdev->p_uuid[UI_BITMAP] = 0UL; | |
2756 | ||
2757 | drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); | |
2758 | *rule_nr = 35; | |
2759 | } else { | |
2760 | dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n"); | |
2761 | *rule_nr = 37; | |
2762 | } | |
2763 | ||
2764 | return -1; | |
2765 | } | |
2766 | ||
2767 | /* Common power [off|failure] */ | |
2768 | rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) + | |
2769 | (mdev->p_uuid[UI_FLAGS] & 2); | |
2770 | /* lowest bit is set when we were primary, | |
2771 | * next bit (weight 2) is set when peer was primary */ | |
2772 | *rule_nr = 40; | |
2773 | ||
2774 | switch (rct) { | |
2775 | case 0: /* !self_pri && !peer_pri */ return 0; | |
2776 | case 1: /* self_pri && !peer_pri */ return 1; | |
2777 | case 2: /* !self_pri && peer_pri */ return -1; | |
2778 | case 3: /* self_pri && peer_pri */ | |
25703f83 | 2779 | dc = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags); |
b411b363 PR |
2780 | return dc ? -1 : 1; |
2781 | } | |
2782 | } | |
2783 | ||
2784 | *rule_nr = 50; | |
2785 | peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); | |
2786 | if (self == peer) | |
2787 | return -1; | |
2788 | ||
2789 | *rule_nr = 51; | |
2790 | peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); | |
2791 | if (self == peer) { | |
31890f4a | 2792 | if (mdev->tconn->agreed_pro_version < 96 ? |
4a23f264 PR |
2793 | (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == |
2794 | (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) : | |
2795 | peer + UUID_NEW_BM_OFFSET == (mdev->p_uuid[UI_BITMAP] & ~((u64)1))) { | |
b411b363 PR |
2796 | /* The last P_SYNC_UUID did not get though. Undo the last start of |
2797 | resync as sync source modifications of the peer's UUIDs. */ | |
2798 | ||
31890f4a | 2799 | if (mdev->tconn->agreed_pro_version < 91) |
4a23f264 | 2800 | return -1091; |
b411b363 PR |
2801 | |
2802 | mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START]; | |
2803 | mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1]; | |
4a23f264 PR |
2804 | |
2805 | dev_info(DEV, "Did not got last syncUUID packet, corrected:\n"); | |
2806 | drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); | |
2807 | ||
b411b363 PR |
2808 | return -1; |
2809 | } | |
2810 | } | |
2811 | ||
2812 | *rule_nr = 60; | |
2813 | self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); | |
2814 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { | |
2815 | peer = mdev->p_uuid[i] & ~((u64)1); | |
2816 | if (self == peer) | |
2817 | return -2; | |
2818 | } | |
2819 | ||
2820 | *rule_nr = 70; | |
2821 | self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); | |
2822 | peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); | |
2823 | if (self == peer) | |
2824 | return 1; | |
2825 | ||
2826 | *rule_nr = 71; | |
2827 | self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); | |
2828 | if (self == peer) { | |
31890f4a | 2829 | if (mdev->tconn->agreed_pro_version < 96 ? |
4a23f264 PR |
2830 | (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == |
2831 | (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) : | |
2832 | self + UUID_NEW_BM_OFFSET == (mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) { | |
b411b363 PR |
2833 | /* The last P_SYNC_UUID did not get though. Undo the last start of |
2834 | resync as sync source modifications of our UUIDs. */ | |
2835 | ||
31890f4a | 2836 | if (mdev->tconn->agreed_pro_version < 91) |
4a23f264 | 2837 | return -1091; |
b411b363 PR |
2838 | |
2839 | _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]); | |
2840 | _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]); | |
2841 | ||
4a23f264 | 2842 | dev_info(DEV, "Last syncUUID did not get through, corrected:\n"); |
b411b363 PR |
2843 | drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, |
2844 | mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); | |
2845 | ||
2846 | return 1; | |
2847 | } | |
2848 | } | |
2849 | ||
2850 | ||
2851 | *rule_nr = 80; | |
d8c2a36b | 2852 | peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); |
b411b363 PR |
2853 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { |
2854 | self = mdev->ldev->md.uuid[i] & ~((u64)1); | |
2855 | if (self == peer) | |
2856 | return 2; | |
2857 | } | |
2858 | ||
2859 | *rule_nr = 90; | |
2860 | self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); | |
2861 | peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); | |
2862 | if (self == peer && self != ((u64)0)) | |
2863 | return 100; | |
2864 | ||
2865 | *rule_nr = 100; | |
2866 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { | |
2867 | self = mdev->ldev->md.uuid[i] & ~((u64)1); | |
2868 | for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { | |
2869 | peer = mdev->p_uuid[j] & ~((u64)1); | |
2870 | if (self == peer) | |
2871 | return -100; | |
2872 | } | |
2873 | } | |
2874 | ||
2875 | return -1000; | |
2876 | } | |
2877 | ||
2878 | /* drbd_sync_handshake() returns the new conn state on success, or | |
2879 | CONN_MASK (-1) on failure. | |
2880 | */ | |
2881 | static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role, | |
2882 | enum drbd_disk_state peer_disk) __must_hold(local) | |
2883 | { | |
b411b363 PR |
2884 | enum drbd_conns rv = C_MASK; |
2885 | enum drbd_disk_state mydisk; | |
44ed167d | 2886 | struct net_conf *nc; |
6dff2902 | 2887 | int hg, rule_nr, rr_conflict, tentative; |
b411b363 PR |
2888 | |
2889 | mydisk = mdev->state.disk; | |
2890 | if (mydisk == D_NEGOTIATING) | |
2891 | mydisk = mdev->new_state_tmp.disk; | |
2892 | ||
2893 | dev_info(DEV, "drbd_sync_handshake:\n"); | |
2894 | drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0); | |
2895 | drbd_uuid_dump(mdev, "peer", mdev->p_uuid, | |
2896 | mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); | |
2897 | ||
2898 | hg = drbd_uuid_compare(mdev, &rule_nr); | |
2899 | ||
2900 | dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr); | |
2901 | ||
2902 | if (hg == -1000) { | |
2903 | dev_alert(DEV, "Unrelated data, aborting!\n"); | |
2904 | return C_MASK; | |
2905 | } | |
4a23f264 PR |
2906 | if (hg < -1000) { |
2907 | dev_alert(DEV, "To resolve this both sides have to support at least protocol %d\n", -hg - 1000); | |
b411b363 PR |
2908 | return C_MASK; |
2909 | } | |
2910 | ||
2911 | if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || | |
2912 | (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { | |
2913 | int f = (hg == -100) || abs(hg) == 2; | |
2914 | hg = mydisk > D_INCONSISTENT ? 1 : -1; | |
2915 | if (f) | |
2916 | hg = hg*2; | |
2917 | dev_info(DEV, "Becoming sync %s due to disk states.\n", | |
2918 | hg > 0 ? "source" : "target"); | |
2919 | } | |
2920 | ||
3a11a487 AG |
2921 | if (abs(hg) == 100) |
2922 | drbd_khelper(mdev, "initial-split-brain"); | |
2923 | ||
44ed167d PR |
2924 | rcu_read_lock(); |
2925 | nc = rcu_dereference(mdev->tconn->net_conf); | |
2926 | ||
2927 | if (hg == 100 || (hg == -100 && nc->always_asbp)) { | |
b411b363 PR |
2928 | int pcount = (mdev->state.role == R_PRIMARY) |
2929 | + (peer_role == R_PRIMARY); | |
2930 | int forced = (hg == -100); | |
2931 | ||
2932 | switch (pcount) { | |
2933 | case 0: | |
2934 | hg = drbd_asb_recover_0p(mdev); | |
2935 | break; | |
2936 | case 1: | |
2937 | hg = drbd_asb_recover_1p(mdev); | |
2938 | break; | |
2939 | case 2: | |
2940 | hg = drbd_asb_recover_2p(mdev); | |
2941 | break; | |
2942 | } | |
2943 | if (abs(hg) < 100) { | |
2944 | dev_warn(DEV, "Split-Brain detected, %d primaries, " | |
2945 | "automatically solved. Sync from %s node\n", | |
2946 | pcount, (hg < 0) ? "peer" : "this"); | |
2947 | if (forced) { | |
2948 | dev_warn(DEV, "Doing a full sync, since" | |
2949 | " UUIDs where ambiguous.\n"); | |
2950 | hg = hg*2; | |
2951 | } | |
2952 | } | |
2953 | } | |
2954 | ||
2955 | if (hg == -100) { | |
08b165ba | 2956 | if (test_bit(DISCARD_MY_DATA, &mdev->flags) && !(mdev->p_uuid[UI_FLAGS]&1)) |
b411b363 | 2957 | hg = -1; |
08b165ba | 2958 | if (!test_bit(DISCARD_MY_DATA, &mdev->flags) && (mdev->p_uuid[UI_FLAGS]&1)) |
b411b363 PR |
2959 | hg = 1; |
2960 | ||
2961 | if (abs(hg) < 100) | |
2962 | dev_warn(DEV, "Split-Brain detected, manually solved. " | |
2963 | "Sync from %s node\n", | |
2964 | (hg < 0) ? "peer" : "this"); | |
2965 | } | |
44ed167d | 2966 | rr_conflict = nc->rr_conflict; |
6dff2902 | 2967 | tentative = nc->tentative; |
44ed167d | 2968 | rcu_read_unlock(); |
b411b363 PR |
2969 | |
2970 | if (hg == -100) { | |
580b9767 LE |
2971 | /* FIXME this log message is not correct if we end up here |
2972 | * after an attempted attach on a diskless node. | |
2973 | * We just refuse to attach -- well, we drop the "connection" | |
2974 | * to that disk, in a way... */ | |
3a11a487 | 2975 | dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n"); |
b411b363 PR |
2976 | drbd_khelper(mdev, "split-brain"); |
2977 | return C_MASK; | |
2978 | } | |
2979 | ||
2980 | if (hg > 0 && mydisk <= D_INCONSISTENT) { | |
2981 | dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n"); | |
2982 | return C_MASK; | |
2983 | } | |
2984 | ||
2985 | if (hg < 0 && /* by intention we do not use mydisk here. */ | |
2986 | mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) { | |
44ed167d | 2987 | switch (rr_conflict) { |
b411b363 PR |
2988 | case ASB_CALL_HELPER: |
2989 | drbd_khelper(mdev, "pri-lost"); | |
2990 | /* fall through */ | |
2991 | case ASB_DISCONNECT: | |
2992 | dev_err(DEV, "I shall become SyncTarget, but I am primary!\n"); | |
2993 | return C_MASK; | |
2994 | case ASB_VIOLENTLY: | |
2995 | dev_warn(DEV, "Becoming SyncTarget, violating the stable-data" | |
2996 | "assumption\n"); | |
2997 | } | |
2998 | } | |
2999 | ||
6dff2902 | 3000 | if (tentative || test_bit(CONN_DRY_RUN, &mdev->tconn->flags)) { |
cf14c2e9 PR |
3001 | if (hg == 0) |
3002 | dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n"); | |
3003 | else | |
3004 | dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.", | |
3005 | drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), | |
3006 | abs(hg) >= 2 ? "full" : "bit-map based"); | |
3007 | return C_MASK; | |
3008 | } | |
3009 | ||
b411b363 PR |
3010 | if (abs(hg) >= 2) { |
3011 | dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); | |
20ceb2b2 LE |
3012 | if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake", |
3013 | BM_LOCKED_SET_ALLOWED)) | |
b411b363 PR |
3014 | return C_MASK; |
3015 | } | |
3016 | ||
3017 | if (hg > 0) { /* become sync source. */ | |
3018 | rv = C_WF_BITMAP_S; | |
3019 | } else if (hg < 0) { /* become sync target */ | |
3020 | rv = C_WF_BITMAP_T; | |
3021 | } else { | |
3022 | rv = C_CONNECTED; | |
3023 | if (drbd_bm_total_weight(mdev)) { | |
3024 | dev_info(DEV, "No resync, but %lu bits in bitmap!\n", | |
3025 | drbd_bm_total_weight(mdev)); | |
3026 | } | |
3027 | } | |
3028 | ||
3029 | return rv; | |
3030 | } | |
3031 | ||
f179d76d | 3032 | static enum drbd_after_sb_p convert_after_sb(enum drbd_after_sb_p peer) |
b411b363 PR |
3033 | { |
3034 | /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ | |
f179d76d PR |
3035 | if (peer == ASB_DISCARD_REMOTE) |
3036 | return ASB_DISCARD_LOCAL; | |
b411b363 PR |
3037 | |
3038 | /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ | |
f179d76d PR |
3039 | if (peer == ASB_DISCARD_LOCAL) |
3040 | return ASB_DISCARD_REMOTE; | |
b411b363 PR |
3041 | |
3042 | /* everything else is valid if they are equal on both sides. */ | |
f179d76d | 3043 | return peer; |
b411b363 PR |
3044 | } |
3045 | ||
e2857216 | 3046 | static int receive_protocol(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 3047 | { |
e658983a | 3048 | struct p_protocol *p = pi->data; |
036b17ea PR |
3049 | enum drbd_after_sb_p p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; |
3050 | int p_proto, p_discard_my_data, p_two_primaries, cf; | |
3051 | struct net_conf *nc, *old_net_conf, *new_net_conf = NULL; | |
3052 | char integrity_alg[SHARED_SECRET_MAX] = ""; | |
accdbcc5 | 3053 | struct crypto_hash *peer_integrity_tfm = NULL; |
7aca6c75 | 3054 | void *int_dig_in = NULL, *int_dig_vv = NULL; |
b411b363 | 3055 | |
b411b363 PR |
3056 | p_proto = be32_to_cpu(p->protocol); |
3057 | p_after_sb_0p = be32_to_cpu(p->after_sb_0p); | |
3058 | p_after_sb_1p = be32_to_cpu(p->after_sb_1p); | |
3059 | p_after_sb_2p = be32_to_cpu(p->after_sb_2p); | |
b411b363 | 3060 | p_two_primaries = be32_to_cpu(p->two_primaries); |
cf14c2e9 | 3061 | cf = be32_to_cpu(p->conn_flags); |
6139f60d | 3062 | p_discard_my_data = cf & CF_DISCARD_MY_DATA; |
cf14c2e9 | 3063 | |
86db0618 AG |
3064 | if (tconn->agreed_pro_version >= 87) { |
3065 | int err; | |
3066 | ||
88104ca4 | 3067 | if (pi->size > sizeof(integrity_alg)) |
86db0618 | 3068 | return -EIO; |
88104ca4 | 3069 | err = drbd_recv_all(tconn, integrity_alg, pi->size); |
86db0618 AG |
3070 | if (err) |
3071 | return err; | |
036b17ea PR |
3072 | integrity_alg[SHARED_SECRET_MAX - 1] = 0; |
3073 | } | |
88104ca4 | 3074 | |
7d4c782c | 3075 | if (pi->cmd != P_PROTOCOL_UPDATE) { |
fbc12f45 | 3076 | clear_bit(CONN_DRY_RUN, &tconn->flags); |
036b17ea | 3077 | |
fbc12f45 AG |
3078 | if (cf & CF_DRY_RUN) |
3079 | set_bit(CONN_DRY_RUN, &tconn->flags); | |
cf14c2e9 | 3080 | |
fbc12f45 AG |
3081 | rcu_read_lock(); |
3082 | nc = rcu_dereference(tconn->net_conf); | |
b411b363 | 3083 | |
fbc12f45 | 3084 | if (p_proto != nc->wire_protocol) { |
d505d9be | 3085 | conn_err(tconn, "incompatible %s settings\n", "protocol"); |
fbc12f45 AG |
3086 | goto disconnect_rcu_unlock; |
3087 | } | |
44ed167d | 3088 | |
fbc12f45 | 3089 | if (convert_after_sb(p_after_sb_0p) != nc->after_sb_0p) { |
d505d9be | 3090 | conn_err(tconn, "incompatible %s settings\n", "after-sb-0pri"); |
fbc12f45 AG |
3091 | goto disconnect_rcu_unlock; |
3092 | } | |
b411b363 | 3093 | |
fbc12f45 | 3094 | if (convert_after_sb(p_after_sb_1p) != nc->after_sb_1p) { |
d505d9be | 3095 | conn_err(tconn, "incompatible %s settings\n", "after-sb-1pri"); |
fbc12f45 AG |
3096 | goto disconnect_rcu_unlock; |
3097 | } | |
b411b363 | 3098 | |
fbc12f45 | 3099 | if (convert_after_sb(p_after_sb_2p) != nc->after_sb_2p) { |
d505d9be | 3100 | conn_err(tconn, "incompatible %s settings\n", "after-sb-2pri"); |
fbc12f45 AG |
3101 | goto disconnect_rcu_unlock; |
3102 | } | |
b411b363 | 3103 | |
fbc12f45 | 3104 | if (p_discard_my_data && nc->discard_my_data) { |
d505d9be | 3105 | conn_err(tconn, "incompatible %s settings\n", "discard-my-data"); |
fbc12f45 AG |
3106 | goto disconnect_rcu_unlock; |
3107 | } | |
b411b363 | 3108 | |
fbc12f45 | 3109 | if (p_two_primaries != nc->two_primaries) { |
d505d9be | 3110 | conn_err(tconn, "incompatible %s settings\n", "allow-two-primaries"); |
fbc12f45 AG |
3111 | goto disconnect_rcu_unlock; |
3112 | } | |
b411b363 | 3113 | |
fbc12f45 | 3114 | if (strcmp(integrity_alg, nc->integrity_alg)) { |
d505d9be | 3115 | conn_err(tconn, "incompatible %s settings\n", "data-integrity-alg"); |
fbc12f45 AG |
3116 | goto disconnect_rcu_unlock; |
3117 | } | |
b411b363 | 3118 | |
fbc12f45 | 3119 | rcu_read_unlock(); |
036b17ea | 3120 | } |
7d4c782c AG |
3121 | |
3122 | if (integrity_alg[0]) { | |
3123 | int hash_size; | |
3124 | ||
3125 | /* | |
3126 | * We can only change the peer data integrity algorithm | |
3127 | * here. Changing our own data integrity algorithm | |
3128 | * requires that we send a P_PROTOCOL_UPDATE packet at | |
3129 | * the same time; otherwise, the peer has no way to | |
3130 | * tell between which packets the algorithm should | |
3131 | * change. | |
3132 | */ | |
3133 | ||
3134 | peer_integrity_tfm = crypto_alloc_hash(integrity_alg, 0, CRYPTO_ALG_ASYNC); | |
3135 | if (!peer_integrity_tfm) { | |
3136 | conn_err(tconn, "peer data-integrity-alg %s not supported\n", | |
3137 | integrity_alg); | |
3138 | goto disconnect; | |
3139 | } | |
3140 | ||
3141 | hash_size = crypto_hash_digestsize(peer_integrity_tfm); | |
3142 | int_dig_in = kmalloc(hash_size, GFP_KERNEL); | |
3143 | int_dig_vv = kmalloc(hash_size, GFP_KERNEL); | |
3144 | if (!(int_dig_in && int_dig_vv)) { | |
3145 | conn_err(tconn, "Allocation of buffers for data integrity checking failed\n"); | |
3146 | goto disconnect; | |
3147 | } | |
3148 | } | |
3149 | ||
3150 | new_net_conf = kmalloc(sizeof(struct net_conf), GFP_KERNEL); | |
3151 | if (!new_net_conf) { | |
3152 | conn_err(tconn, "Allocation of new net_conf failed\n"); | |
3153 | goto disconnect; | |
3154 | } | |
3155 | ||
3156 | mutex_lock(&tconn->data.mutex); | |
3157 | mutex_lock(&tconn->conf_update); | |
3158 | old_net_conf = tconn->net_conf; | |
3159 | *new_net_conf = *old_net_conf; | |
3160 | ||
3161 | new_net_conf->wire_protocol = p_proto; | |
3162 | new_net_conf->after_sb_0p = convert_after_sb(p_after_sb_0p); | |
3163 | new_net_conf->after_sb_1p = convert_after_sb(p_after_sb_1p); | |
3164 | new_net_conf->after_sb_2p = convert_after_sb(p_after_sb_2p); | |
3165 | new_net_conf->two_primaries = p_two_primaries; | |
3166 | ||
3167 | rcu_assign_pointer(tconn->net_conf, new_net_conf); | |
3168 | mutex_unlock(&tconn->conf_update); | |
3169 | mutex_unlock(&tconn->data.mutex); | |
3170 | ||
3171 | crypto_free_hash(tconn->peer_integrity_tfm); | |
3172 | kfree(tconn->int_dig_in); | |
3173 | kfree(tconn->int_dig_vv); | |
3174 | tconn->peer_integrity_tfm = peer_integrity_tfm; | |
3175 | tconn->int_dig_in = int_dig_in; | |
3176 | tconn->int_dig_vv = int_dig_vv; | |
3177 | ||
3178 | if (strcmp(old_net_conf->integrity_alg, integrity_alg)) | |
3179 | conn_info(tconn, "peer data-integrity-alg: %s\n", | |
3180 | integrity_alg[0] ? integrity_alg : "(none)"); | |
3181 | ||
3182 | synchronize_rcu(); | |
3183 | kfree(old_net_conf); | |
82bc0194 | 3184 | return 0; |
b411b363 | 3185 | |
44ed167d PR |
3186 | disconnect_rcu_unlock: |
3187 | rcu_read_unlock(); | |
b411b363 | 3188 | disconnect: |
b792c35c | 3189 | crypto_free_hash(peer_integrity_tfm); |
036b17ea PR |
3190 | kfree(int_dig_in); |
3191 | kfree(int_dig_vv); | |
7204624c | 3192 | conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 3193 | return -EIO; |
b411b363 PR |
3194 | } |
3195 | ||
3196 | /* helper function | |
3197 | * input: alg name, feature name | |
3198 | * return: NULL (alg name was "") | |
3199 | * ERR_PTR(error) if something goes wrong | |
3200 | * or the crypto hash ptr, if it worked out ok. */ | |
3201 | struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev, | |
3202 | const char *alg, const char *name) | |
3203 | { | |
3204 | struct crypto_hash *tfm; | |
3205 | ||
3206 | if (!alg[0]) | |
3207 | return NULL; | |
3208 | ||
3209 | tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC); | |
3210 | if (IS_ERR(tfm)) { | |
3211 | dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n", | |
3212 | alg, name, PTR_ERR(tfm)); | |
3213 | return tfm; | |
3214 | } | |
b411b363 PR |
3215 | return tfm; |
3216 | } | |
3217 | ||
4a76b161 AG |
3218 | static int ignore_remaining_packet(struct drbd_tconn *tconn, struct packet_info *pi) |
3219 | { | |
3220 | void *buffer = tconn->data.rbuf; | |
3221 | int size = pi->size; | |
3222 | ||
3223 | while (size) { | |
3224 | int s = min_t(int, size, DRBD_SOCKET_BUFFER_SIZE); | |
3225 | s = drbd_recv(tconn, buffer, s); | |
3226 | if (s <= 0) { | |
3227 | if (s < 0) | |
3228 | return s; | |
3229 | break; | |
3230 | } | |
3231 | size -= s; | |
3232 | } | |
3233 | if (size) | |
3234 | return -EIO; | |
3235 | return 0; | |
3236 | } | |
3237 | ||
3238 | /* | |
3239 | * config_unknown_volume - device configuration command for unknown volume | |
3240 | * | |
3241 | * When a device is added to an existing connection, the node on which the | |
3242 | * device is added first will send configuration commands to its peer but the | |
3243 | * peer will not know about the device yet. It will warn and ignore these | |
3244 | * commands. Once the device is added on the second node, the second node will | |
3245 | * send the same device configuration commands, but in the other direction. | |
3246 | * | |
3247 | * (We can also end up here if drbd is misconfigured.) | |
3248 | */ | |
3249 | static int config_unknown_volume(struct drbd_tconn *tconn, struct packet_info *pi) | |
3250 | { | |
2fcb8f30 AG |
3251 | conn_warn(tconn, "%s packet received for volume %u, which is not configured locally\n", |
3252 | cmdname(pi->cmd), pi->vnr); | |
4a76b161 AG |
3253 | return ignore_remaining_packet(tconn, pi); |
3254 | } | |
3255 | ||
3256 | static int receive_SyncParam(struct drbd_tconn *tconn, struct packet_info *pi) | |
b411b363 | 3257 | { |
4a76b161 | 3258 | struct drbd_conf *mdev; |
e658983a | 3259 | struct p_rs_param_95 *p; |
b411b363 PR |
3260 | unsigned int header_size, data_size, exp_max_sz; |
3261 | struct crypto_hash *verify_tfm = NULL; | |
3262 | struct crypto_hash *csums_tfm = NULL; | |
2ec91e0e | 3263 | struct net_conf *old_net_conf, *new_net_conf = NULL; |
813472ce | 3264 | struct disk_conf *old_disk_conf = NULL, *new_disk_conf = NULL; |
4a76b161 | 3265 | const int apv = tconn->agreed_pro_version; |
813472ce | 3266 | struct fifo_buffer *old_plan = NULL, *new_plan = NULL; |
778f271d | 3267 | int fifo_size = 0; |
82bc0194 | 3268 | int err; |
b411b363 | 3269 | |
4a76b161 AG |
3270 | mdev = vnr_to_mdev(tconn, pi->vnr); |
3271 | if (!mdev) | |
3272 | return config_unknown_volume(tconn, pi); | |
3273 | ||
b411b363 PR |
3274 | exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) |
3275 | : apv == 88 ? sizeof(struct p_rs_param) | |
3276 | + SHARED_SECRET_MAX | |
8e26f9cc PR |
3277 | : apv <= 94 ? sizeof(struct p_rs_param_89) |
3278 | : /* apv >= 95 */ sizeof(struct p_rs_param_95); | |
b411b363 | 3279 | |
e2857216 | 3280 | if (pi->size > exp_max_sz) { |
b411b363 | 3281 | dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n", |
e2857216 | 3282 | pi->size, exp_max_sz); |
82bc0194 | 3283 | return -EIO; |
b411b363 PR |
3284 | } |
3285 | ||
3286 | if (apv <= 88) { | |
e658983a | 3287 | header_size = sizeof(struct p_rs_param); |
e2857216 | 3288 | data_size = pi->size - header_size; |
8e26f9cc | 3289 | } else if (apv <= 94) { |
e658983a | 3290 | header_size = sizeof(struct p_rs_param_89); |
e2857216 | 3291 | data_size = pi->size - header_size; |
b411b363 | 3292 | D_ASSERT(data_size == 0); |
8e26f9cc | 3293 | } else { |
e658983a | 3294 | header_size = sizeof(struct p_rs_param_95); |
e2857216 | 3295 | data_size = pi->size - header_size; |
b411b363 PR |
3296 | D_ASSERT(data_size == 0); |
3297 | } | |
3298 | ||
3299 | /* initialize verify_alg and csums_alg */ | |
e658983a | 3300 | p = pi->data; |
b411b363 PR |
3301 | memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); |
3302 | ||
e658983a | 3303 | err = drbd_recv_all(mdev->tconn, p, header_size); |
82bc0194 AG |
3304 | if (err) |
3305 | return err; | |
b411b363 | 3306 | |
daeda1cc PR |
3307 | mutex_lock(&mdev->tconn->conf_update); |
3308 | old_net_conf = mdev->tconn->net_conf; | |
813472ce PR |
3309 | if (get_ldev(mdev)) { |
3310 | new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); | |
3311 | if (!new_disk_conf) { | |
3312 | put_ldev(mdev); | |
3313 | mutex_unlock(&mdev->tconn->conf_update); | |
3314 | dev_err(DEV, "Allocation of new disk_conf failed\n"); | |
3315 | return -ENOMEM; | |
3316 | } | |
daeda1cc | 3317 | |
813472ce PR |
3318 | old_disk_conf = mdev->ldev->disk_conf; |
3319 | *new_disk_conf = *old_disk_conf; | |
3320 | ||
6394b935 | 3321 | new_disk_conf->resync_rate = be32_to_cpu(p->resync_rate); |
813472ce | 3322 | } |
daeda1cc | 3323 | |
b411b363 PR |
3324 | if (apv >= 88) { |
3325 | if (apv == 88) { | |
3326 | if (data_size > SHARED_SECRET_MAX) { | |
3327 | dev_err(DEV, "verify-alg too long, " | |
3328 | "peer wants %u, accepting only %u byte\n", | |
3329 | data_size, SHARED_SECRET_MAX); | |
813472ce PR |
3330 | err = -EIO; |
3331 | goto reconnect; | |
b411b363 PR |
3332 | } |
3333 | ||
82bc0194 | 3334 | err = drbd_recv_all(mdev->tconn, p->verify_alg, data_size); |
813472ce PR |
3335 | if (err) |
3336 | goto reconnect; | |
b411b363 PR |
3337 | /* we expect NUL terminated string */ |
3338 | /* but just in case someone tries to be evil */ | |
3339 | D_ASSERT(p->verify_alg[data_size-1] == 0); | |
3340 | p->verify_alg[data_size-1] = 0; | |
3341 | ||
3342 | } else /* apv >= 89 */ { | |
3343 | /* we still expect NUL terminated strings */ | |
3344 | /* but just in case someone tries to be evil */ | |
3345 | D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0); | |
3346 | D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0); | |
3347 | p->verify_alg[SHARED_SECRET_MAX-1] = 0; | |
3348 | p->csums_alg[SHARED_SECRET_MAX-1] = 0; | |
3349 | } | |
3350 | ||
2ec91e0e | 3351 | if (strcmp(old_net_conf->verify_alg, p->verify_alg)) { |
b411b363 PR |
3352 | if (mdev->state.conn == C_WF_REPORT_PARAMS) { |
3353 | dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", | |
2ec91e0e | 3354 | old_net_conf->verify_alg, p->verify_alg); |
b411b363 PR |
3355 | goto disconnect; |
3356 | } | |
3357 | verify_tfm = drbd_crypto_alloc_digest_safe(mdev, | |
3358 | p->verify_alg, "verify-alg"); | |
3359 | if (IS_ERR(verify_tfm)) { | |
3360 | verify_tfm = NULL; | |
3361 | goto disconnect; | |
3362 | } | |
3363 | } | |
3364 | ||
2ec91e0e | 3365 | if (apv >= 89 && strcmp(old_net_conf->csums_alg, p->csums_alg)) { |
b411b363 PR |
3366 | if (mdev->state.conn == C_WF_REPORT_PARAMS) { |
3367 | dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", | |
2ec91e0e | 3368 | old_net_conf->csums_alg, p->csums_alg); |
b411b363 PR |
3369 | goto disconnect; |
3370 | } | |
3371 | csums_tfm = drbd_crypto_alloc_digest_safe(mdev, | |
3372 | p->csums_alg, "csums-alg"); | |
3373 | if (IS_ERR(csums_tfm)) { | |
3374 | csums_tfm = NULL; | |
3375 | goto disconnect; | |
3376 | } | |
3377 | } | |
3378 | ||
813472ce | 3379 | if (apv > 94 && new_disk_conf) { |
daeda1cc PR |
3380 | new_disk_conf->c_plan_ahead = be32_to_cpu(p->c_plan_ahead); |
3381 | new_disk_conf->c_delay_target = be32_to_cpu(p->c_delay_target); | |
3382 | new_disk_conf->c_fill_target = be32_to_cpu(p->c_fill_target); | |
3383 | new_disk_conf->c_max_rate = be32_to_cpu(p->c_max_rate); | |
778f271d | 3384 | |
daeda1cc | 3385 | fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ; |
9958c857 | 3386 | if (fifo_size != mdev->rs_plan_s->size) { |
813472ce PR |
3387 | new_plan = fifo_alloc(fifo_size); |
3388 | if (!new_plan) { | |
778f271d | 3389 | dev_err(DEV, "kmalloc of fifo_buffer failed"); |
f399002e | 3390 | put_ldev(mdev); |
778f271d PR |
3391 | goto disconnect; |
3392 | } | |
3393 | } | |
8e26f9cc | 3394 | } |
b411b363 | 3395 | |
91fd4dad | 3396 | if (verify_tfm || csums_tfm) { |
2ec91e0e PR |
3397 | new_net_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL); |
3398 | if (!new_net_conf) { | |
91fd4dad PR |
3399 | dev_err(DEV, "Allocation of new net_conf failed\n"); |
3400 | goto disconnect; | |
3401 | } | |
3402 | ||
2ec91e0e | 3403 | *new_net_conf = *old_net_conf; |
91fd4dad PR |
3404 | |
3405 | if (verify_tfm) { | |
2ec91e0e PR |
3406 | strcpy(new_net_conf->verify_alg, p->verify_alg); |
3407 | new_net_conf->verify_alg_len = strlen(p->verify_alg) + 1; | |
91fd4dad PR |
3408 | crypto_free_hash(mdev->tconn->verify_tfm); |
3409 | mdev->tconn->verify_tfm = verify_tfm; | |
3410 | dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg); | |
3411 | } | |
3412 | if (csums_tfm) { | |
2ec91e0e PR |
3413 | strcpy(new_net_conf->csums_alg, p->csums_alg); |
3414 | new_net_conf->csums_alg_len = strlen(p->csums_alg) + 1; | |
91fd4dad PR |
3415 | crypto_free_hash(mdev->tconn->csums_tfm); |
3416 | mdev->tconn->csums_tfm = csums_tfm; | |
3417 | dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg); | |
3418 | } | |
2ec91e0e | 3419 | rcu_assign_pointer(tconn->net_conf, new_net_conf); |
b411b363 | 3420 | } |
daeda1cc | 3421 | } |
91fd4dad | 3422 | |
813472ce PR |
3423 | if (new_disk_conf) { |
3424 | rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf); | |
3425 | put_ldev(mdev); | |
3426 | } | |
3427 | ||
3428 | if (new_plan) { | |
3429 | old_plan = mdev->rs_plan_s; | |
3430 | rcu_assign_pointer(mdev->rs_plan_s, new_plan); | |
b411b363 | 3431 | } |
daeda1cc PR |
3432 | |
3433 | mutex_unlock(&mdev->tconn->conf_update); | |
3434 | synchronize_rcu(); | |
3435 | if (new_net_conf) | |
3436 | kfree(old_net_conf); | |
3437 | kfree(old_disk_conf); | |
813472ce | 3438 | kfree(old_plan); |
daeda1cc | 3439 | |
82bc0194 | 3440 | return 0; |
b411b363 | 3441 | |
813472ce PR |
3442 | reconnect: |
3443 | if (new_disk_conf) { | |
3444 | put_ldev(mdev); | |
3445 | kfree(new_disk_conf); | |
3446 | } | |
3447 | mutex_unlock(&mdev->tconn->conf_update); | |
3448 | return -EIO; | |
3449 | ||
b411b363 | 3450 | disconnect: |
813472ce PR |
3451 | kfree(new_plan); |
3452 | if (new_disk_conf) { | |
3453 | put_ldev(mdev); | |
3454 | kfree(new_disk_conf); | |
3455 | } | |
a0095508 | 3456 | mutex_unlock(&mdev->tconn->conf_update); |
b411b363 PR |
3457 | /* just for completeness: actually not needed, |
3458 | * as this is not reached if csums_tfm was ok. */ | |
3459 | crypto_free_hash(csums_tfm); | |
3460 | /* but free the verify_tfm again, if csums_tfm did not work out */ | |
3461 | crypto_free_hash(verify_tfm); | |
38fa9988 | 3462 | conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 3463 | return -EIO; |
b411b363 PR |
3464 | } |
3465 | ||
b411b363 PR |
3466 | /* warn if the arguments differ by more than 12.5% */ |
3467 | static void warn_if_differ_considerably(struct drbd_conf *mdev, | |
3468 | const char *s, sector_t a, sector_t b) | |
3469 | { | |
3470 | sector_t d; | |
3471 | if (a == 0 || b == 0) | |
3472 | return; | |
3473 | d = (a > b) ? (a - b) : (b - a); | |
3474 | if (d > (a>>3) || d > (b>>3)) | |
3475 | dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s, | |
3476 | (unsigned long long)a, (unsigned long long)b); | |
3477 | } | |
3478 | ||
4a76b161 | 3479 | static int receive_sizes(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 3480 | { |
4a76b161 | 3481 | struct drbd_conf *mdev; |
e658983a | 3482 | struct p_sizes *p = pi->data; |
b411b363 | 3483 | enum determine_dev_size dd = unchanged; |
b411b363 PR |
3484 | sector_t p_size, p_usize, my_usize; |
3485 | int ldsc = 0; /* local disk size changed */ | |
e89b591c | 3486 | enum dds_flags ddsf; |
b411b363 | 3487 | |
4a76b161 AG |
3488 | mdev = vnr_to_mdev(tconn, pi->vnr); |
3489 | if (!mdev) | |
3490 | return config_unknown_volume(tconn, pi); | |
3491 | ||
b411b363 PR |
3492 | p_size = be64_to_cpu(p->d_size); |
3493 | p_usize = be64_to_cpu(p->u_size); | |
3494 | ||
b411b363 PR |
3495 | /* just store the peer's disk size for now. |
3496 | * we still need to figure out whether we accept that. */ | |
3497 | mdev->p_size = p_size; | |
3498 | ||
b411b363 | 3499 | if (get_ldev(mdev)) { |
daeda1cc PR |
3500 | rcu_read_lock(); |
3501 | my_usize = rcu_dereference(mdev->ldev->disk_conf)->disk_size; | |
3502 | rcu_read_unlock(); | |
3503 | ||
b411b363 PR |
3504 | warn_if_differ_considerably(mdev, "lower level device sizes", |
3505 | p_size, drbd_get_max_capacity(mdev->ldev)); | |
3506 | warn_if_differ_considerably(mdev, "user requested size", | |
daeda1cc | 3507 | p_usize, my_usize); |
b411b363 PR |
3508 | |
3509 | /* if this is the first connect, or an otherwise expected | |
3510 | * param exchange, choose the minimum */ | |
3511 | if (mdev->state.conn == C_WF_REPORT_PARAMS) | |
daeda1cc | 3512 | p_usize = min_not_zero(my_usize, p_usize); |
b411b363 PR |
3513 | |
3514 | /* Never shrink a device with usable data during connect. | |
3515 | But allow online shrinking if we are connected. */ | |
ef5e44a6 | 3516 | if (drbd_new_dev_size(mdev, mdev->ldev, p_usize, 0) < |
daeda1cc PR |
3517 | drbd_get_capacity(mdev->this_bdev) && |
3518 | mdev->state.disk >= D_OUTDATED && | |
3519 | mdev->state.conn < C_CONNECTED) { | |
b411b363 | 3520 | dev_err(DEV, "The peer's disk size is too small!\n"); |
38fa9988 | 3521 | conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 | 3522 | put_ldev(mdev); |
82bc0194 | 3523 | return -EIO; |
b411b363 | 3524 | } |
daeda1cc PR |
3525 | |
3526 | if (my_usize != p_usize) { | |
3527 | struct disk_conf *old_disk_conf, *new_disk_conf = NULL; | |
3528 | ||
3529 | new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); | |
3530 | if (!new_disk_conf) { | |
3531 | dev_err(DEV, "Allocation of new disk_conf failed\n"); | |
3532 | put_ldev(mdev); | |
3533 | return -ENOMEM; | |
3534 | } | |
3535 | ||
3536 | mutex_lock(&mdev->tconn->conf_update); | |
3537 | old_disk_conf = mdev->ldev->disk_conf; | |
3538 | *new_disk_conf = *old_disk_conf; | |
3539 | new_disk_conf->disk_size = p_usize; | |
3540 | ||
3541 | rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf); | |
3542 | mutex_unlock(&mdev->tconn->conf_update); | |
3543 | synchronize_rcu(); | |
3544 | kfree(old_disk_conf); | |
3545 | ||
3546 | dev_info(DEV, "Peer sets u_size to %lu sectors\n", | |
3547 | (unsigned long)my_usize); | |
3548 | } | |
3549 | ||
b411b363 PR |
3550 | put_ldev(mdev); |
3551 | } | |
b411b363 | 3552 | |
e89b591c | 3553 | ddsf = be16_to_cpu(p->dds_flags); |
b411b363 | 3554 | if (get_ldev(mdev)) { |
24c4830c | 3555 | dd = drbd_determine_dev_size(mdev, ddsf); |
b411b363 PR |
3556 | put_ldev(mdev); |
3557 | if (dd == dev_size_error) | |
82bc0194 | 3558 | return -EIO; |
b411b363 PR |
3559 | drbd_md_sync(mdev); |
3560 | } else { | |
3561 | /* I am diskless, need to accept the peer's size. */ | |
3562 | drbd_set_my_capacity(mdev, p_size); | |
3563 | } | |
3564 | ||
99432fcc PR |
3565 | mdev->peer_max_bio_size = be32_to_cpu(p->max_bio_size); |
3566 | drbd_reconsider_max_bio_size(mdev); | |
3567 | ||
b411b363 PR |
3568 | if (get_ldev(mdev)) { |
3569 | if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { | |
3570 | mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); | |
3571 | ldsc = 1; | |
3572 | } | |
3573 | ||
b411b363 PR |
3574 | put_ldev(mdev); |
3575 | } | |
3576 | ||
3577 | if (mdev->state.conn > C_WF_REPORT_PARAMS) { | |
3578 | if (be64_to_cpu(p->c_size) != | |
3579 | drbd_get_capacity(mdev->this_bdev) || ldsc) { | |
3580 | /* we have different sizes, probably peer | |
3581 | * needs to know my new size... */ | |
e89b591c | 3582 | drbd_send_sizes(mdev, 0, ddsf); |
b411b363 PR |
3583 | } |
3584 | if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) || | |
3585 | (dd == grew && mdev->state.conn == C_CONNECTED)) { | |
3586 | if (mdev->state.pdsk >= D_INCONSISTENT && | |
e89b591c PR |
3587 | mdev->state.disk >= D_INCONSISTENT) { |
3588 | if (ddsf & DDSF_NO_RESYNC) | |
3589 | dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n"); | |
3590 | else | |
3591 | resync_after_online_grow(mdev); | |
3592 | } else | |
b411b363 PR |
3593 | set_bit(RESYNC_AFTER_NEG, &mdev->flags); |
3594 | } | |
3595 | } | |
3596 | ||
82bc0194 | 3597 | return 0; |
b411b363 PR |
3598 | } |
3599 | ||
4a76b161 | 3600 | static int receive_uuids(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 3601 | { |
4a76b161 | 3602 | struct drbd_conf *mdev; |
e658983a | 3603 | struct p_uuids *p = pi->data; |
b411b363 | 3604 | u64 *p_uuid; |
62b0da3a | 3605 | int i, updated_uuids = 0; |
b411b363 | 3606 | |
4a76b161 AG |
3607 | mdev = vnr_to_mdev(tconn, pi->vnr); |
3608 | if (!mdev) | |
3609 | return config_unknown_volume(tconn, pi); | |
3610 | ||
b411b363 PR |
3611 | p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); |
3612 | ||
3613 | for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) | |
3614 | p_uuid[i] = be64_to_cpu(p->uuid[i]); | |
3615 | ||
3616 | kfree(mdev->p_uuid); | |
3617 | mdev->p_uuid = p_uuid; | |
3618 | ||
3619 | if (mdev->state.conn < C_CONNECTED && | |
3620 | mdev->state.disk < D_INCONSISTENT && | |
3621 | mdev->state.role == R_PRIMARY && | |
3622 | (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { | |
3623 | dev_err(DEV, "Can only connect to data with current UUID=%016llX\n", | |
3624 | (unsigned long long)mdev->ed_uuid); | |
38fa9988 | 3625 | conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 3626 | return -EIO; |
b411b363 PR |
3627 | } |
3628 | ||
3629 | if (get_ldev(mdev)) { | |
3630 | int skip_initial_sync = | |
3631 | mdev->state.conn == C_CONNECTED && | |
31890f4a | 3632 | mdev->tconn->agreed_pro_version >= 90 && |
b411b363 PR |
3633 | mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && |
3634 | (p_uuid[UI_FLAGS] & 8); | |
3635 | if (skip_initial_sync) { | |
3636 | dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n"); | |
3637 | drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, | |
20ceb2b2 LE |
3638 | "clear_n_write from receive_uuids", |
3639 | BM_LOCKED_TEST_ALLOWED); | |
b411b363 PR |
3640 | _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]); |
3641 | _drbd_uuid_set(mdev, UI_BITMAP, 0); | |
3642 | _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), | |
3643 | CS_VERBOSE, NULL); | |
3644 | drbd_md_sync(mdev); | |
62b0da3a | 3645 | updated_uuids = 1; |
b411b363 PR |
3646 | } |
3647 | put_ldev(mdev); | |
18a50fa2 PR |
3648 | } else if (mdev->state.disk < D_INCONSISTENT && |
3649 | mdev->state.role == R_PRIMARY) { | |
3650 | /* I am a diskless primary, the peer just created a new current UUID | |
3651 | for me. */ | |
62b0da3a | 3652 | updated_uuids = drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); |
b411b363 PR |
3653 | } |
3654 | ||
3655 | /* Before we test for the disk state, we should wait until an eventually | |
3656 | ongoing cluster wide state change is finished. That is important if | |
3657 | we are primary and are detaching from our disk. We need to see the | |
3658 | new disk state... */ | |
8410da8f PR |
3659 | mutex_lock(mdev->state_mutex); |
3660 | mutex_unlock(mdev->state_mutex); | |
b411b363 | 3661 | if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT) |
62b0da3a LE |
3662 | updated_uuids |= drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); |
3663 | ||
3664 | if (updated_uuids) | |
3665 | drbd_print_uuids(mdev, "receiver updated UUIDs to"); | |
b411b363 | 3666 | |
82bc0194 | 3667 | return 0; |
b411b363 PR |
3668 | } |
3669 | ||
3670 | /** | |
3671 | * convert_state() - Converts the peer's view of the cluster state to our point of view | |
3672 | * @ps: The state as seen by the peer. | |
3673 | */ | |
3674 | static union drbd_state convert_state(union drbd_state ps) | |
3675 | { | |
3676 | union drbd_state ms; | |
3677 | ||
3678 | static enum drbd_conns c_tab[] = { | |
369bea63 | 3679 | [C_WF_REPORT_PARAMS] = C_WF_REPORT_PARAMS, |
b411b363 PR |
3680 | [C_CONNECTED] = C_CONNECTED, |
3681 | ||
3682 | [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, | |
3683 | [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, | |
3684 | [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ | |
3685 | [C_VERIFY_S] = C_VERIFY_T, | |
3686 | [C_MASK] = C_MASK, | |
3687 | }; | |
3688 | ||
3689 | ms.i = ps.i; | |
3690 | ||
3691 | ms.conn = c_tab[ps.conn]; | |
3692 | ms.peer = ps.role; | |
3693 | ms.role = ps.peer; | |
3694 | ms.pdsk = ps.disk; | |
3695 | ms.disk = ps.pdsk; | |
3696 | ms.peer_isp = (ps.aftr_isp | ps.user_isp); | |
3697 | ||
3698 | return ms; | |
3699 | } | |
3700 | ||
4a76b161 | 3701 | static int receive_req_state(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 3702 | { |
4a76b161 | 3703 | struct drbd_conf *mdev; |
e658983a | 3704 | struct p_req_state *p = pi->data; |
b411b363 | 3705 | union drbd_state mask, val; |
bf885f8a | 3706 | enum drbd_state_rv rv; |
b411b363 | 3707 | |
4a76b161 AG |
3708 | mdev = vnr_to_mdev(tconn, pi->vnr); |
3709 | if (!mdev) | |
3710 | return -EIO; | |
3711 | ||
b411b363 PR |
3712 | mask.i = be32_to_cpu(p->mask); |
3713 | val.i = be32_to_cpu(p->val); | |
3714 | ||
25703f83 | 3715 | if (test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) && |
8410da8f | 3716 | mutex_is_locked(mdev->state_mutex)) { |
b411b363 | 3717 | drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG); |
82bc0194 | 3718 | return 0; |
b411b363 PR |
3719 | } |
3720 | ||
3721 | mask = convert_state(mask); | |
3722 | val = convert_state(val); | |
3723 | ||
dfafcc8a PR |
3724 | rv = drbd_change_state(mdev, CS_VERBOSE, mask, val); |
3725 | drbd_send_sr_reply(mdev, rv); | |
b411b363 | 3726 | |
b411b363 PR |
3727 | drbd_md_sync(mdev); |
3728 | ||
82bc0194 | 3729 | return 0; |
b411b363 PR |
3730 | } |
3731 | ||
e2857216 | 3732 | static int receive_req_conn_state(struct drbd_tconn *tconn, struct packet_info *pi) |
dfafcc8a | 3733 | { |
e658983a | 3734 | struct p_req_state *p = pi->data; |
dfafcc8a PR |
3735 | union drbd_state mask, val; |
3736 | enum drbd_state_rv rv; | |
3737 | ||
3738 | mask.i = be32_to_cpu(p->mask); | |
3739 | val.i = be32_to_cpu(p->val); | |
3740 | ||
3741 | if (test_bit(DISCARD_CONCURRENT, &tconn->flags) && | |
3742 | mutex_is_locked(&tconn->cstate_mutex)) { | |
3743 | conn_send_sr_reply(tconn, SS_CONCURRENT_ST_CHG); | |
82bc0194 | 3744 | return 0; |
dfafcc8a PR |
3745 | } |
3746 | ||
3747 | mask = convert_state(mask); | |
3748 | val = convert_state(val); | |
3749 | ||
778bcf2e | 3750 | rv = conn_request_state(tconn, mask, val, CS_VERBOSE | CS_LOCAL_ONLY | CS_IGN_OUTD_FAIL); |
dfafcc8a PR |
3751 | conn_send_sr_reply(tconn, rv); |
3752 | ||
82bc0194 | 3753 | return 0; |
dfafcc8a PR |
3754 | } |
3755 | ||
4a76b161 | 3756 | static int receive_state(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 3757 | { |
4a76b161 | 3758 | struct drbd_conf *mdev; |
e658983a | 3759 | struct p_state *p = pi->data; |
4ac4aada | 3760 | union drbd_state os, ns, peer_state; |
b411b363 | 3761 | enum drbd_disk_state real_peer_disk; |
65d922c3 | 3762 | enum chg_state_flags cs_flags; |
b411b363 PR |
3763 | int rv; |
3764 | ||
4a76b161 AG |
3765 | mdev = vnr_to_mdev(tconn, pi->vnr); |
3766 | if (!mdev) | |
3767 | return config_unknown_volume(tconn, pi); | |
3768 | ||
b411b363 PR |
3769 | peer_state.i = be32_to_cpu(p->state); |
3770 | ||
3771 | real_peer_disk = peer_state.disk; | |
3772 | if (peer_state.disk == D_NEGOTIATING) { | |
3773 | real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; | |
3774 | dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); | |
3775 | } | |
3776 | ||
87eeee41 | 3777 | spin_lock_irq(&mdev->tconn->req_lock); |
b411b363 | 3778 | retry: |
78bae59b | 3779 | os = ns = drbd_read_state(mdev); |
87eeee41 | 3780 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 3781 | |
9bcd2521 PR |
3782 | /* If this is the "end of sync" confirmation, usually the peer disk |
3783 | * transitions from D_INCONSISTENT to D_UP_TO_DATE. For empty (0 bits | |
3784 | * set) resync started in PausedSyncT, or if the timing of pause-/ | |
3785 | * unpause-sync events has been "just right", the peer disk may | |
3786 | * transition from D_CONSISTENT to D_UP_TO_DATE as well. | |
3787 | */ | |
3788 | if ((os.pdsk == D_INCONSISTENT || os.pdsk == D_CONSISTENT) && | |
3789 | real_peer_disk == D_UP_TO_DATE && | |
e9ef7bb6 LE |
3790 | os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { |
3791 | /* If we are (becoming) SyncSource, but peer is still in sync | |
3792 | * preparation, ignore its uptodate-ness to avoid flapping, it | |
3793 | * will change to inconsistent once the peer reaches active | |
3794 | * syncing states. | |
3795 | * It may have changed syncer-paused flags, however, so we | |
3796 | * cannot ignore this completely. */ | |
3797 | if (peer_state.conn > C_CONNECTED && | |
3798 | peer_state.conn < C_SYNC_SOURCE) | |
3799 | real_peer_disk = D_INCONSISTENT; | |
3800 | ||
3801 | /* if peer_state changes to connected at the same time, | |
3802 | * it explicitly notifies us that it finished resync. | |
3803 | * Maybe we should finish it up, too? */ | |
3804 | else if (os.conn >= C_SYNC_SOURCE && | |
3805 | peer_state.conn == C_CONNECTED) { | |
3806 | if (drbd_bm_total_weight(mdev) <= mdev->rs_failed) | |
3807 | drbd_resync_finished(mdev); | |
82bc0194 | 3808 | return 0; |
e9ef7bb6 LE |
3809 | } |
3810 | } | |
3811 | ||
3812 | /* peer says his disk is inconsistent, while we think it is uptodate, | |
3813 | * and this happens while the peer still thinks we have a sync going on, | |
3814 | * but we think we are already done with the sync. | |
3815 | * We ignore this to avoid flapping pdsk. | |
3816 | * This should not happen, if the peer is a recent version of drbd. */ | |
3817 | if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && | |
3818 | os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) | |
3819 | real_peer_disk = D_UP_TO_DATE; | |
3820 | ||
4ac4aada LE |
3821 | if (ns.conn == C_WF_REPORT_PARAMS) |
3822 | ns.conn = C_CONNECTED; | |
b411b363 | 3823 | |
67531718 PR |
3824 | if (peer_state.conn == C_AHEAD) |
3825 | ns.conn = C_BEHIND; | |
3826 | ||
b411b363 PR |
3827 | if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING && |
3828 | get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
3829 | int cr; /* consider resync */ | |
3830 | ||
3831 | /* if we established a new connection */ | |
4ac4aada | 3832 | cr = (os.conn < C_CONNECTED); |
b411b363 PR |
3833 | /* if we had an established connection |
3834 | * and one of the nodes newly attaches a disk */ | |
4ac4aada | 3835 | cr |= (os.conn == C_CONNECTED && |
b411b363 | 3836 | (peer_state.disk == D_NEGOTIATING || |
4ac4aada | 3837 | os.disk == D_NEGOTIATING)); |
b411b363 PR |
3838 | /* if we have both been inconsistent, and the peer has been |
3839 | * forced to be UpToDate with --overwrite-data */ | |
3840 | cr |= test_bit(CONSIDER_RESYNC, &mdev->flags); | |
3841 | /* if we had been plain connected, and the admin requested to | |
3842 | * start a sync by "invalidate" or "invalidate-remote" */ | |
4ac4aada | 3843 | cr |= (os.conn == C_CONNECTED && |
b411b363 PR |
3844 | (peer_state.conn >= C_STARTING_SYNC_S && |
3845 | peer_state.conn <= C_WF_BITMAP_T)); | |
3846 | ||
3847 | if (cr) | |
4ac4aada | 3848 | ns.conn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk); |
b411b363 PR |
3849 | |
3850 | put_ldev(mdev); | |
4ac4aada LE |
3851 | if (ns.conn == C_MASK) { |
3852 | ns.conn = C_CONNECTED; | |
b411b363 | 3853 | if (mdev->state.disk == D_NEGOTIATING) { |
82f59cc6 | 3854 | drbd_force_state(mdev, NS(disk, D_FAILED)); |
b411b363 PR |
3855 | } else if (peer_state.disk == D_NEGOTIATING) { |
3856 | dev_err(DEV, "Disk attach process on the peer node was aborted.\n"); | |
3857 | peer_state.disk = D_DISKLESS; | |
580b9767 | 3858 | real_peer_disk = D_DISKLESS; |
b411b363 | 3859 | } else { |
8169e41b | 3860 | if (test_and_clear_bit(CONN_DRY_RUN, &mdev->tconn->flags)) |
82bc0194 | 3861 | return -EIO; |
4ac4aada | 3862 | D_ASSERT(os.conn == C_WF_REPORT_PARAMS); |
38fa9988 | 3863 | conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 3864 | return -EIO; |
b411b363 PR |
3865 | } |
3866 | } | |
3867 | } | |
3868 | ||
87eeee41 | 3869 | spin_lock_irq(&mdev->tconn->req_lock); |
78bae59b | 3870 | if (os.i != drbd_read_state(mdev).i) |
b411b363 PR |
3871 | goto retry; |
3872 | clear_bit(CONSIDER_RESYNC, &mdev->flags); | |
b411b363 PR |
3873 | ns.peer = peer_state.role; |
3874 | ns.pdsk = real_peer_disk; | |
3875 | ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); | |
4ac4aada | 3876 | if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) |
b411b363 | 3877 | ns.disk = mdev->new_state_tmp.disk; |
4ac4aada | 3878 | cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); |
2aebfabb | 3879 | if (ns.pdsk == D_CONSISTENT && drbd_suspended(mdev) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && |
481c6f50 | 3880 | test_bit(NEW_CUR_UUID, &mdev->flags)) { |
8554df1c | 3881 | /* Do not allow tl_restart(RESEND) for a rebooted peer. We can only allow this |
481c6f50 | 3882 | for temporal network outages! */ |
87eeee41 | 3883 | spin_unlock_irq(&mdev->tconn->req_lock); |
481c6f50 | 3884 | dev_err(DEV, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); |
2f5cdd0b | 3885 | tl_clear(mdev->tconn); |
481c6f50 PR |
3886 | drbd_uuid_new_current(mdev); |
3887 | clear_bit(NEW_CUR_UUID, &mdev->flags); | |
38fa9988 | 3888 | conn_request_state(mdev->tconn, NS2(conn, C_PROTOCOL_ERROR, susp, 0), CS_HARD); |
82bc0194 | 3889 | return -EIO; |
481c6f50 | 3890 | } |
65d922c3 | 3891 | rv = _drbd_set_state(mdev, ns, cs_flags, NULL); |
78bae59b | 3892 | ns = drbd_read_state(mdev); |
87eeee41 | 3893 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
3894 | |
3895 | if (rv < SS_SUCCESS) { | |
38fa9988 | 3896 | conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 3897 | return -EIO; |
b411b363 PR |
3898 | } |
3899 | ||
4ac4aada LE |
3900 | if (os.conn > C_WF_REPORT_PARAMS) { |
3901 | if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED && | |
b411b363 PR |
3902 | peer_state.disk != D_NEGOTIATING ) { |
3903 | /* we want resync, peer has not yet decided to sync... */ | |
3904 | /* Nowadays only used when forcing a node into primary role and | |
3905 | setting its disk to UpToDate with that */ | |
3906 | drbd_send_uuids(mdev); | |
43de7c85 | 3907 | drbd_send_current_state(mdev); |
b411b363 PR |
3908 | } |
3909 | } | |
3910 | ||
08b165ba | 3911 | clear_bit(DISCARD_MY_DATA, &mdev->flags); |
b411b363 PR |
3912 | |
3913 | drbd_md_sync(mdev); /* update connected indicator, la_size, ... */ | |
3914 | ||
82bc0194 | 3915 | return 0; |
b411b363 PR |
3916 | } |
3917 | ||
4a76b161 | 3918 | static int receive_sync_uuid(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 3919 | { |
4a76b161 | 3920 | struct drbd_conf *mdev; |
e658983a | 3921 | struct p_rs_uuid *p = pi->data; |
4a76b161 AG |
3922 | |
3923 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
3924 | if (!mdev) | |
3925 | return -EIO; | |
b411b363 PR |
3926 | |
3927 | wait_event(mdev->misc_wait, | |
3928 | mdev->state.conn == C_WF_SYNC_UUID || | |
c4752ef1 | 3929 | mdev->state.conn == C_BEHIND || |
b411b363 PR |
3930 | mdev->state.conn < C_CONNECTED || |
3931 | mdev->state.disk < D_NEGOTIATING); | |
3932 | ||
3933 | /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */ | |
3934 | ||
b411b363 PR |
3935 | /* Here the _drbd_uuid_ functions are right, current should |
3936 | _not_ be rotated into the history */ | |
3937 | if (get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
3938 | _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid)); | |
3939 | _drbd_uuid_set(mdev, UI_BITMAP, 0UL); | |
3940 | ||
62b0da3a | 3941 | drbd_print_uuids(mdev, "updated sync uuid"); |
b411b363 PR |
3942 | drbd_start_resync(mdev, C_SYNC_TARGET); |
3943 | ||
3944 | put_ldev(mdev); | |
3945 | } else | |
3946 | dev_err(DEV, "Ignoring SyncUUID packet!\n"); | |
3947 | ||
82bc0194 | 3948 | return 0; |
b411b363 PR |
3949 | } |
3950 | ||
2c46407d AG |
3951 | /** |
3952 | * receive_bitmap_plain | |
3953 | * | |
3954 | * Return 0 when done, 1 when another iteration is needed, and a negative error | |
3955 | * code upon failure. | |
3956 | */ | |
3957 | static int | |
50d0b1ad | 3958 | receive_bitmap_plain(struct drbd_conf *mdev, unsigned int size, |
e658983a | 3959 | unsigned long *p, struct bm_xfer_ctx *c) |
b411b363 | 3960 | { |
50d0b1ad AG |
3961 | unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - |
3962 | drbd_header_size(mdev->tconn); | |
e658983a | 3963 | unsigned int num_words = min_t(size_t, data_size / sizeof(*p), |
50d0b1ad | 3964 | c->bm_words - c->word_offset); |
e658983a | 3965 | unsigned int want = num_words * sizeof(*p); |
2c46407d | 3966 | int err; |
b411b363 | 3967 | |
50d0b1ad AG |
3968 | if (want != size) { |
3969 | dev_err(DEV, "%s:want (%u) != size (%u)\n", __func__, want, size); | |
2c46407d | 3970 | return -EIO; |
b411b363 PR |
3971 | } |
3972 | if (want == 0) | |
2c46407d | 3973 | return 0; |
e658983a | 3974 | err = drbd_recv_all(mdev->tconn, p, want); |
82bc0194 | 3975 | if (err) |
2c46407d | 3976 | return err; |
b411b363 | 3977 | |
e658983a | 3978 | drbd_bm_merge_lel(mdev, c->word_offset, num_words, p); |
b411b363 PR |
3979 | |
3980 | c->word_offset += num_words; | |
3981 | c->bit_offset = c->word_offset * BITS_PER_LONG; | |
3982 | if (c->bit_offset > c->bm_bits) | |
3983 | c->bit_offset = c->bm_bits; | |
3984 | ||
2c46407d | 3985 | return 1; |
b411b363 PR |
3986 | } |
3987 | ||
a02d1240 AG |
3988 | static enum drbd_bitmap_code dcbp_get_code(struct p_compressed_bm *p) |
3989 | { | |
3990 | return (enum drbd_bitmap_code)(p->encoding & 0x0f); | |
3991 | } | |
3992 | ||
3993 | static int dcbp_get_start(struct p_compressed_bm *p) | |
3994 | { | |
3995 | return (p->encoding & 0x80) != 0; | |
3996 | } | |
3997 | ||
3998 | static int dcbp_get_pad_bits(struct p_compressed_bm *p) | |
3999 | { | |
4000 | return (p->encoding >> 4) & 0x7; | |
4001 | } | |
4002 | ||
2c46407d AG |
4003 | /** |
4004 | * recv_bm_rle_bits | |
4005 | * | |
4006 | * Return 0 when done, 1 when another iteration is needed, and a negative error | |
4007 | * code upon failure. | |
4008 | */ | |
4009 | static int | |
b411b363 PR |
4010 | recv_bm_rle_bits(struct drbd_conf *mdev, |
4011 | struct p_compressed_bm *p, | |
c6d25cfe PR |
4012 | struct bm_xfer_ctx *c, |
4013 | unsigned int len) | |
b411b363 PR |
4014 | { |
4015 | struct bitstream bs; | |
4016 | u64 look_ahead; | |
4017 | u64 rl; | |
4018 | u64 tmp; | |
4019 | unsigned long s = c->bit_offset; | |
4020 | unsigned long e; | |
a02d1240 | 4021 | int toggle = dcbp_get_start(p); |
b411b363 PR |
4022 | int have; |
4023 | int bits; | |
4024 | ||
a02d1240 | 4025 | bitstream_init(&bs, p->code, len, dcbp_get_pad_bits(p)); |
b411b363 PR |
4026 | |
4027 | bits = bitstream_get_bits(&bs, &look_ahead, 64); | |
4028 | if (bits < 0) | |
2c46407d | 4029 | return -EIO; |
b411b363 PR |
4030 | |
4031 | for (have = bits; have > 0; s += rl, toggle = !toggle) { | |
4032 | bits = vli_decode_bits(&rl, look_ahead); | |
4033 | if (bits <= 0) | |
2c46407d | 4034 | return -EIO; |
b411b363 PR |
4035 | |
4036 | if (toggle) { | |
4037 | e = s + rl -1; | |
4038 | if (e >= c->bm_bits) { | |
4039 | dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); | |
2c46407d | 4040 | return -EIO; |
b411b363 PR |
4041 | } |
4042 | _drbd_bm_set_bits(mdev, s, e); | |
4043 | } | |
4044 | ||
4045 | if (have < bits) { | |
4046 | dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", | |
4047 | have, bits, look_ahead, | |
4048 | (unsigned int)(bs.cur.b - p->code), | |
4049 | (unsigned int)bs.buf_len); | |
2c46407d | 4050 | return -EIO; |
b411b363 PR |
4051 | } |
4052 | look_ahead >>= bits; | |
4053 | have -= bits; | |
4054 | ||
4055 | bits = bitstream_get_bits(&bs, &tmp, 64 - have); | |
4056 | if (bits < 0) | |
2c46407d | 4057 | return -EIO; |
b411b363 PR |
4058 | look_ahead |= tmp << have; |
4059 | have += bits; | |
4060 | } | |
4061 | ||
4062 | c->bit_offset = s; | |
4063 | bm_xfer_ctx_bit_to_word_offset(c); | |
4064 | ||
2c46407d | 4065 | return (s != c->bm_bits); |
b411b363 PR |
4066 | } |
4067 | ||
2c46407d AG |
4068 | /** |
4069 | * decode_bitmap_c | |
4070 | * | |
4071 | * Return 0 when done, 1 when another iteration is needed, and a negative error | |
4072 | * code upon failure. | |
4073 | */ | |
4074 | static int | |
b411b363 PR |
4075 | decode_bitmap_c(struct drbd_conf *mdev, |
4076 | struct p_compressed_bm *p, | |
c6d25cfe PR |
4077 | struct bm_xfer_ctx *c, |
4078 | unsigned int len) | |
b411b363 | 4079 | { |
a02d1240 | 4080 | if (dcbp_get_code(p) == RLE_VLI_Bits) |
e658983a | 4081 | return recv_bm_rle_bits(mdev, p, c, len - sizeof(*p)); |
b411b363 PR |
4082 | |
4083 | /* other variants had been implemented for evaluation, | |
4084 | * but have been dropped as this one turned out to be "best" | |
4085 | * during all our tests. */ | |
4086 | ||
4087 | dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding); | |
38fa9988 | 4088 | conn_request_state(mdev->tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); |
2c46407d | 4089 | return -EIO; |
b411b363 PR |
4090 | } |
4091 | ||
4092 | void INFO_bm_xfer_stats(struct drbd_conf *mdev, | |
4093 | const char *direction, struct bm_xfer_ctx *c) | |
4094 | { | |
4095 | /* what would it take to transfer it "plaintext" */ | |
50d0b1ad AG |
4096 | unsigned int header_size = drbd_header_size(mdev->tconn); |
4097 | unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - header_size; | |
4098 | unsigned int plain = | |
4099 | header_size * (DIV_ROUND_UP(c->bm_words, data_size) + 1) + | |
4100 | c->bm_words * sizeof(unsigned long); | |
4101 | unsigned int total = c->bytes[0] + c->bytes[1]; | |
4102 | unsigned int r; | |
b411b363 PR |
4103 | |
4104 | /* total can not be zero. but just in case: */ | |
4105 | if (total == 0) | |
4106 | return; | |
4107 | ||
4108 | /* don't report if not compressed */ | |
4109 | if (total >= plain) | |
4110 | return; | |
4111 | ||
4112 | /* total < plain. check for overflow, still */ | |
4113 | r = (total > UINT_MAX/1000) ? (total / (plain/1000)) | |
4114 | : (1000 * total / plain); | |
4115 | ||
4116 | if (r > 1000) | |
4117 | r = 1000; | |
4118 | ||
4119 | r = 1000 - r; | |
4120 | dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " | |
4121 | "total %u; compression: %u.%u%%\n", | |
4122 | direction, | |
4123 | c->bytes[1], c->packets[1], | |
4124 | c->bytes[0], c->packets[0], | |
4125 | total, r/10, r % 10); | |
4126 | } | |
4127 | ||
4128 | /* Since we are processing the bitfield from lower addresses to higher, | |
4129 | it does not matter if the process it in 32 bit chunks or 64 bit | |
4130 | chunks as long as it is little endian. (Understand it as byte stream, | |
4131 | beginning with the lowest byte...) If we would use big endian | |
4132 | we would need to process it from the highest address to the lowest, | |
4133 | in order to be agnostic to the 32 vs 64 bits issue. | |
4134 | ||
4135 | returns 0 on failure, 1 if we successfully received it. */ | |
4a76b161 | 4136 | static int receive_bitmap(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4137 | { |
4a76b161 | 4138 | struct drbd_conf *mdev; |
b411b363 | 4139 | struct bm_xfer_ctx c; |
2c46407d | 4140 | int err; |
4a76b161 AG |
4141 | |
4142 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
4143 | if (!mdev) | |
4144 | return -EIO; | |
b411b363 | 4145 | |
20ceb2b2 LE |
4146 | drbd_bm_lock(mdev, "receive bitmap", BM_LOCKED_SET_ALLOWED); |
4147 | /* you are supposed to send additional out-of-sync information | |
4148 | * if you actually set bits during this phase */ | |
b411b363 | 4149 | |
b411b363 PR |
4150 | c = (struct bm_xfer_ctx) { |
4151 | .bm_bits = drbd_bm_bits(mdev), | |
4152 | .bm_words = drbd_bm_words(mdev), | |
4153 | }; | |
4154 | ||
2c46407d | 4155 | for(;;) { |
e658983a AG |
4156 | if (pi->cmd == P_BITMAP) |
4157 | err = receive_bitmap_plain(mdev, pi->size, pi->data, &c); | |
4158 | else if (pi->cmd == P_COMPRESSED_BITMAP) { | |
b411b363 PR |
4159 | /* MAYBE: sanity check that we speak proto >= 90, |
4160 | * and the feature is enabled! */ | |
e658983a | 4161 | struct p_compressed_bm *p = pi->data; |
b411b363 | 4162 | |
50d0b1ad | 4163 | if (pi->size > DRBD_SOCKET_BUFFER_SIZE - drbd_header_size(tconn)) { |
b411b363 | 4164 | dev_err(DEV, "ReportCBitmap packet too large\n"); |
82bc0194 | 4165 | err = -EIO; |
b411b363 PR |
4166 | goto out; |
4167 | } | |
e658983a | 4168 | if (pi->size <= sizeof(*p)) { |
e2857216 | 4169 | dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", pi->size); |
82bc0194 | 4170 | err = -EIO; |
78fcbdae | 4171 | goto out; |
b411b363 | 4172 | } |
e658983a AG |
4173 | err = drbd_recv_all(mdev->tconn, p, pi->size); |
4174 | if (err) | |
4175 | goto out; | |
e2857216 | 4176 | err = decode_bitmap_c(mdev, p, &c, pi->size); |
b411b363 | 4177 | } else { |
e2857216 | 4178 | dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", pi->cmd); |
82bc0194 | 4179 | err = -EIO; |
b411b363 PR |
4180 | goto out; |
4181 | } | |
4182 | ||
e2857216 | 4183 | c.packets[pi->cmd == P_BITMAP]++; |
50d0b1ad | 4184 | c.bytes[pi->cmd == P_BITMAP] += drbd_header_size(tconn) + pi->size; |
b411b363 | 4185 | |
2c46407d AG |
4186 | if (err <= 0) { |
4187 | if (err < 0) | |
4188 | goto out; | |
b411b363 | 4189 | break; |
2c46407d | 4190 | } |
e2857216 | 4191 | err = drbd_recv_header(mdev->tconn, pi); |
82bc0194 | 4192 | if (err) |
b411b363 | 4193 | goto out; |
2c46407d | 4194 | } |
b411b363 PR |
4195 | |
4196 | INFO_bm_xfer_stats(mdev, "receive", &c); | |
4197 | ||
4198 | if (mdev->state.conn == C_WF_BITMAP_T) { | |
de1f8e4a AG |
4199 | enum drbd_state_rv rv; |
4200 | ||
82bc0194 AG |
4201 | err = drbd_send_bitmap(mdev); |
4202 | if (err) | |
b411b363 PR |
4203 | goto out; |
4204 | /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ | |
de1f8e4a AG |
4205 | rv = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); |
4206 | D_ASSERT(rv == SS_SUCCESS); | |
b411b363 PR |
4207 | } else if (mdev->state.conn != C_WF_BITMAP_S) { |
4208 | /* admin may have requested C_DISCONNECTING, | |
4209 | * other threads may have noticed network errors */ | |
4210 | dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n", | |
4211 | drbd_conn_str(mdev->state.conn)); | |
4212 | } | |
82bc0194 | 4213 | err = 0; |
b411b363 | 4214 | |
b411b363 | 4215 | out: |
20ceb2b2 | 4216 | drbd_bm_unlock(mdev); |
82bc0194 | 4217 | if (!err && mdev->state.conn == C_WF_BITMAP_S) |
b411b363 | 4218 | drbd_start_resync(mdev, C_SYNC_SOURCE); |
82bc0194 | 4219 | return err; |
b411b363 PR |
4220 | } |
4221 | ||
4a76b161 | 4222 | static int receive_skip(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4223 | { |
4a76b161 | 4224 | conn_warn(tconn, "skipping unknown optional packet type %d, l: %d!\n", |
e2857216 | 4225 | pi->cmd, pi->size); |
2de876ef | 4226 | |
4a76b161 | 4227 | return ignore_remaining_packet(tconn, pi); |
2de876ef PR |
4228 | } |
4229 | ||
4a76b161 | 4230 | static int receive_UnplugRemote(struct drbd_tconn *tconn, struct packet_info *pi) |
0ced55a3 | 4231 | { |
e7f52dfb LE |
4232 | /* Make sure we've acked all the TCP data associated |
4233 | * with the data requests being unplugged */ | |
4a76b161 | 4234 | drbd_tcp_quickack(tconn->data.socket); |
0ced55a3 | 4235 | |
82bc0194 | 4236 | return 0; |
0ced55a3 PR |
4237 | } |
4238 | ||
4a76b161 | 4239 | static int receive_out_of_sync(struct drbd_tconn *tconn, struct packet_info *pi) |
73a01a18 | 4240 | { |
4a76b161 | 4241 | struct drbd_conf *mdev; |
e658983a | 4242 | struct p_block_desc *p = pi->data; |
4a76b161 AG |
4243 | |
4244 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
4245 | if (!mdev) | |
4246 | return -EIO; | |
73a01a18 | 4247 | |
f735e363 LE |
4248 | switch (mdev->state.conn) { |
4249 | case C_WF_SYNC_UUID: | |
4250 | case C_WF_BITMAP_T: | |
4251 | case C_BEHIND: | |
4252 | break; | |
4253 | default: | |
4254 | dev_err(DEV, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n", | |
4255 | drbd_conn_str(mdev->state.conn)); | |
4256 | } | |
4257 | ||
73a01a18 PR |
4258 | drbd_set_out_of_sync(mdev, be64_to_cpu(p->sector), be32_to_cpu(p->blksize)); |
4259 | ||
82bc0194 | 4260 | return 0; |
73a01a18 PR |
4261 | } |
4262 | ||
02918be2 PR |
4263 | struct data_cmd { |
4264 | int expect_payload; | |
4265 | size_t pkt_size; | |
4a76b161 | 4266 | int (*fn)(struct drbd_tconn *, struct packet_info *); |
02918be2 PR |
4267 | }; |
4268 | ||
4269 | static struct data_cmd drbd_cmd_handler[] = { | |
4a76b161 AG |
4270 | [P_DATA] = { 1, sizeof(struct p_data), receive_Data }, |
4271 | [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply }, | |
4272 | [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } , | |
4273 | [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } , | |
e658983a AG |
4274 | [P_BITMAP] = { 1, 0, receive_bitmap } , |
4275 | [P_COMPRESSED_BITMAP] = { 1, 0, receive_bitmap } , | |
4276 | [P_UNPLUG_REMOTE] = { 0, 0, receive_UnplugRemote }, | |
4a76b161 AG |
4277 | [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, |
4278 | [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, | |
e658983a AG |
4279 | [P_SYNC_PARAM] = { 1, 0, receive_SyncParam }, |
4280 | [P_SYNC_PARAM89] = { 1, 0, receive_SyncParam }, | |
4a76b161 AG |
4281 | [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol }, |
4282 | [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids }, | |
4283 | [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes }, | |
4284 | [P_STATE] = { 0, sizeof(struct p_state), receive_state }, | |
4285 | [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state }, | |
4286 | [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid }, | |
4287 | [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, | |
4288 | [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest }, | |
4289 | [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest }, | |
4290 | [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip }, | |
4291 | [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync }, | |
4292 | [P_CONN_ST_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_conn_state }, | |
036b17ea | 4293 | [P_PROTOCOL_UPDATE] = { 1, sizeof(struct p_protocol), receive_protocol }, |
b411b363 PR |
4294 | }; |
4295 | ||
eefc2f7d | 4296 | static void drbdd(struct drbd_tconn *tconn) |
b411b363 | 4297 | { |
77351055 | 4298 | struct packet_info pi; |
02918be2 | 4299 | size_t shs; /* sub header size */ |
82bc0194 | 4300 | int err; |
b411b363 | 4301 | |
eefc2f7d | 4302 | while (get_t_state(&tconn->receiver) == RUNNING) { |
deebe195 AG |
4303 | struct data_cmd *cmd; |
4304 | ||
eefc2f7d | 4305 | drbd_thread_current_set_cpu(&tconn->receiver); |
69bc7bc3 | 4306 | if (drbd_recv_header(tconn, &pi)) |
02918be2 | 4307 | goto err_out; |
b411b363 | 4308 | |
deebe195 | 4309 | cmd = &drbd_cmd_handler[pi.cmd]; |
4a76b161 | 4310 | if (unlikely(pi.cmd >= ARRAY_SIZE(drbd_cmd_handler) || !cmd->fn)) { |
2fcb8f30 AG |
4311 | conn_err(tconn, "Unexpected data packet %s (0x%04x)", |
4312 | cmdname(pi.cmd), pi.cmd); | |
02918be2 | 4313 | goto err_out; |
0b33a916 | 4314 | } |
b411b363 | 4315 | |
e658983a AG |
4316 | shs = cmd->pkt_size; |
4317 | if (pi.size > shs && !cmd->expect_payload) { | |
2fcb8f30 AG |
4318 | conn_err(tconn, "No payload expected %s l:%d\n", |
4319 | cmdname(pi.cmd), pi.size); | |
02918be2 | 4320 | goto err_out; |
b411b363 | 4321 | } |
b411b363 | 4322 | |
c13f7e1a | 4323 | if (shs) { |
e658983a | 4324 | err = drbd_recv_all_warn(tconn, pi.data, shs); |
a5c31904 | 4325 | if (err) |
c13f7e1a | 4326 | goto err_out; |
e2857216 | 4327 | pi.size -= shs; |
c13f7e1a LE |
4328 | } |
4329 | ||
4a76b161 AG |
4330 | err = cmd->fn(tconn, &pi); |
4331 | if (err) { | |
9f5bdc33 AG |
4332 | conn_err(tconn, "error receiving %s, e: %d l: %d!\n", |
4333 | cmdname(pi.cmd), err, pi.size); | |
02918be2 | 4334 | goto err_out; |
b411b363 PR |
4335 | } |
4336 | } | |
82bc0194 | 4337 | return; |
b411b363 | 4338 | |
82bc0194 AG |
4339 | err_out: |
4340 | conn_request_state(tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); | |
b411b363 PR |
4341 | } |
4342 | ||
0e29d163 | 4343 | void conn_flush_workqueue(struct drbd_tconn *tconn) |
b411b363 PR |
4344 | { |
4345 | struct drbd_wq_barrier barr; | |
4346 | ||
4347 | barr.w.cb = w_prev_work_done; | |
0e29d163 | 4348 | barr.w.tconn = tconn; |
b411b363 | 4349 | init_completion(&barr.done); |
0e29d163 | 4350 | drbd_queue_work(&tconn->data.work, &barr.w); |
b411b363 PR |
4351 | wait_for_completion(&barr.done); |
4352 | } | |
4353 | ||
81fa2e67 | 4354 | static void conn_disconnect(struct drbd_tconn *tconn) |
b411b363 | 4355 | { |
c141ebda | 4356 | struct drbd_conf *mdev; |
bbeb641c | 4357 | enum drbd_conns oc; |
376694a0 | 4358 | int vnr; |
b411b363 | 4359 | |
bbeb641c | 4360 | if (tconn->cstate == C_STANDALONE) |
b411b363 | 4361 | return; |
b411b363 PR |
4362 | |
4363 | /* asender does not clean up anything. it must not interfere, either */ | |
360cc740 PR |
4364 | drbd_thread_stop(&tconn->asender); |
4365 | drbd_free_sock(tconn); | |
4366 | ||
c141ebda PR |
4367 | rcu_read_lock(); |
4368 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { | |
4369 | kref_get(&mdev->kref); | |
4370 | rcu_read_unlock(); | |
4371 | drbd_disconnected(mdev); | |
4372 | kref_put(&mdev->kref, &drbd_minor_destroy); | |
4373 | rcu_read_lock(); | |
4374 | } | |
4375 | rcu_read_unlock(); | |
4376 | ||
12038a3a PR |
4377 | if (!list_empty(&tconn->current_epoch->list)) |
4378 | conn_err(tconn, "ASSERTION FAILED: tconn->current_epoch->list not empty\n"); | |
4379 | /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ | |
4380 | atomic_set(&tconn->current_epoch->epoch_size, 0); | |
4381 | ||
360cc740 PR |
4382 | conn_info(tconn, "Connection closed\n"); |
4383 | ||
cb703454 PR |
4384 | if (conn_highest_role(tconn) == R_PRIMARY && conn_highest_pdsk(tconn) >= D_UNKNOWN) |
4385 | conn_try_outdate_peer_async(tconn); | |
4386 | ||
360cc740 | 4387 | spin_lock_irq(&tconn->req_lock); |
bbeb641c PR |
4388 | oc = tconn->cstate; |
4389 | if (oc >= C_UNCONNECTED) | |
376694a0 | 4390 | _conn_request_state(tconn, NS(conn, C_UNCONNECTED), CS_VERBOSE); |
bbeb641c | 4391 | |
360cc740 PR |
4392 | spin_unlock_irq(&tconn->req_lock); |
4393 | ||
f3dfa40a | 4394 | if (oc == C_DISCONNECTING) |
d9cc6e23 | 4395 | conn_request_state(tconn, NS(conn, C_STANDALONE), CS_VERBOSE | CS_HARD); |
360cc740 PR |
4396 | } |
4397 | ||
c141ebda | 4398 | static int drbd_disconnected(struct drbd_conf *mdev) |
360cc740 | 4399 | { |
360cc740 | 4400 | unsigned int i; |
b411b363 | 4401 | |
85719573 | 4402 | /* wait for current activity to cease. */ |
87eeee41 | 4403 | spin_lock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
4404 | _drbd_wait_ee_list_empty(mdev, &mdev->active_ee); |
4405 | _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee); | |
4406 | _drbd_wait_ee_list_empty(mdev, &mdev->read_ee); | |
87eeee41 | 4407 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
4408 | |
4409 | /* We do not have data structures that would allow us to | |
4410 | * get the rs_pending_cnt down to 0 again. | |
4411 | * * On C_SYNC_TARGET we do not have any data structures describing | |
4412 | * the pending RSDataRequest's we have sent. | |
4413 | * * On C_SYNC_SOURCE there is no data structure that tracks | |
4414 | * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. | |
4415 | * And no, it is not the sum of the reference counts in the | |
4416 | * resync_LRU. The resync_LRU tracks the whole operation including | |
4417 | * the disk-IO, while the rs_pending_cnt only tracks the blocks | |
4418 | * on the fly. */ | |
4419 | drbd_rs_cancel_all(mdev); | |
4420 | mdev->rs_total = 0; | |
4421 | mdev->rs_failed = 0; | |
4422 | atomic_set(&mdev->rs_pending_cnt, 0); | |
4423 | wake_up(&mdev->misc_wait); | |
4424 | ||
b411b363 | 4425 | del_timer_sync(&mdev->resync_timer); |
b411b363 PR |
4426 | resync_timer_fn((unsigned long)mdev); |
4427 | ||
b411b363 PR |
4428 | /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, |
4429 | * w_make_resync_request etc. which may still be on the worker queue | |
4430 | * to be "canceled" */ | |
a21e9298 | 4431 | drbd_flush_workqueue(mdev); |
b411b363 | 4432 | |
a990be46 | 4433 | drbd_finish_peer_reqs(mdev); |
b411b363 PR |
4434 | |
4435 | kfree(mdev->p_uuid); | |
4436 | mdev->p_uuid = NULL; | |
4437 | ||
2aebfabb | 4438 | if (!drbd_suspended(mdev)) |
2f5cdd0b | 4439 | tl_clear(mdev->tconn); |
b411b363 | 4440 | |
b411b363 PR |
4441 | drbd_md_sync(mdev); |
4442 | ||
20ceb2b2 LE |
4443 | /* serialize with bitmap writeout triggered by the state change, |
4444 | * if any. */ | |
4445 | wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags)); | |
4446 | ||
b411b363 PR |
4447 | /* tcp_close and release of sendpage pages can be deferred. I don't |
4448 | * want to use SO_LINGER, because apparently it can be deferred for | |
4449 | * more than 20 seconds (longest time I checked). | |
4450 | * | |
4451 | * Actually we don't care for exactly when the network stack does its | |
4452 | * put_page(), but release our reference on these pages right here. | |
4453 | */ | |
7721f567 | 4454 | i = drbd_free_peer_reqs(mdev, &mdev->net_ee); |
b411b363 PR |
4455 | if (i) |
4456 | dev_info(DEV, "net_ee not empty, killed %u entries\n", i); | |
435f0740 LE |
4457 | i = atomic_read(&mdev->pp_in_use_by_net); |
4458 | if (i) | |
4459 | dev_info(DEV, "pp_in_use_by_net = %d, expected 0\n", i); | |
b411b363 PR |
4460 | i = atomic_read(&mdev->pp_in_use); |
4461 | if (i) | |
45bb912b | 4462 | dev_info(DEV, "pp_in_use = %d, expected 0\n", i); |
b411b363 PR |
4463 | |
4464 | D_ASSERT(list_empty(&mdev->read_ee)); | |
4465 | D_ASSERT(list_empty(&mdev->active_ee)); | |
4466 | D_ASSERT(list_empty(&mdev->sync_ee)); | |
4467 | D_ASSERT(list_empty(&mdev->done_ee)); | |
4468 | ||
360cc740 | 4469 | return 0; |
b411b363 PR |
4470 | } |
4471 | ||
4472 | /* | |
4473 | * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version | |
4474 | * we can agree on is stored in agreed_pro_version. | |
4475 | * | |
4476 | * feature flags and the reserved array should be enough room for future | |
4477 | * enhancements of the handshake protocol, and possible plugins... | |
4478 | * | |
4479 | * for now, they are expected to be zero, but ignored. | |
4480 | */ | |
6038178e | 4481 | static int drbd_send_features(struct drbd_tconn *tconn) |
b411b363 | 4482 | { |
9f5bdc33 AG |
4483 | struct drbd_socket *sock; |
4484 | struct p_connection_features *p; | |
b411b363 | 4485 | |
9f5bdc33 AG |
4486 | sock = &tconn->data; |
4487 | p = conn_prepare_command(tconn, sock); | |
4488 | if (!p) | |
e8d17b01 | 4489 | return -EIO; |
b411b363 PR |
4490 | memset(p, 0, sizeof(*p)); |
4491 | p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); | |
4492 | p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); | |
9f5bdc33 | 4493 | return conn_send_command(tconn, sock, P_CONNECTION_FEATURES, sizeof(*p), NULL, 0); |
b411b363 PR |
4494 | } |
4495 | ||
4496 | /* | |
4497 | * return values: | |
4498 | * 1 yes, we have a valid connection | |
4499 | * 0 oops, did not work out, please try again | |
4500 | * -1 peer talks different language, | |
4501 | * no point in trying again, please go standalone. | |
4502 | */ | |
6038178e | 4503 | static int drbd_do_features(struct drbd_tconn *tconn) |
b411b363 | 4504 | { |
65d11ed6 | 4505 | /* ASSERT current == tconn->receiver ... */ |
e658983a AG |
4506 | struct p_connection_features *p; |
4507 | const int expect = sizeof(struct p_connection_features); | |
77351055 | 4508 | struct packet_info pi; |
a5c31904 | 4509 | int err; |
b411b363 | 4510 | |
6038178e | 4511 | err = drbd_send_features(tconn); |
e8d17b01 | 4512 | if (err) |
b411b363 PR |
4513 | return 0; |
4514 | ||
69bc7bc3 AG |
4515 | err = drbd_recv_header(tconn, &pi); |
4516 | if (err) | |
b411b363 PR |
4517 | return 0; |
4518 | ||
6038178e AG |
4519 | if (pi.cmd != P_CONNECTION_FEATURES) { |
4520 | conn_err(tconn, "expected ConnectionFeatures packet, received: %s (0x%04x)\n", | |
2fcb8f30 | 4521 | cmdname(pi.cmd), pi.cmd); |
b411b363 PR |
4522 | return -1; |
4523 | } | |
4524 | ||
77351055 | 4525 | if (pi.size != expect) { |
6038178e | 4526 | conn_err(tconn, "expected ConnectionFeatures length: %u, received: %u\n", |
77351055 | 4527 | expect, pi.size); |
b411b363 PR |
4528 | return -1; |
4529 | } | |
4530 | ||
e658983a AG |
4531 | p = pi.data; |
4532 | err = drbd_recv_all_warn(tconn, p, expect); | |
a5c31904 | 4533 | if (err) |
b411b363 | 4534 | return 0; |
b411b363 | 4535 | |
b411b363 PR |
4536 | p->protocol_min = be32_to_cpu(p->protocol_min); |
4537 | p->protocol_max = be32_to_cpu(p->protocol_max); | |
4538 | if (p->protocol_max == 0) | |
4539 | p->protocol_max = p->protocol_min; | |
4540 | ||
4541 | if (PRO_VERSION_MAX < p->protocol_min || | |
4542 | PRO_VERSION_MIN > p->protocol_max) | |
4543 | goto incompat; | |
4544 | ||
65d11ed6 | 4545 | tconn->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); |
b411b363 | 4546 | |
65d11ed6 PR |
4547 | conn_info(tconn, "Handshake successful: " |
4548 | "Agreed network protocol version %d\n", tconn->agreed_pro_version); | |
b411b363 PR |
4549 | |
4550 | return 1; | |
4551 | ||
4552 | incompat: | |
65d11ed6 | 4553 | conn_err(tconn, "incompatible DRBD dialects: " |
b411b363 PR |
4554 | "I support %d-%d, peer supports %d-%d\n", |
4555 | PRO_VERSION_MIN, PRO_VERSION_MAX, | |
4556 | p->protocol_min, p->protocol_max); | |
4557 | return -1; | |
4558 | } | |
4559 | ||
4560 | #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) | |
13e6037d | 4561 | static int drbd_do_auth(struct drbd_tconn *tconn) |
b411b363 PR |
4562 | { |
4563 | dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); | |
4564 | dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); | |
b10d96cb | 4565 | return -1; |
b411b363 PR |
4566 | } |
4567 | #else | |
4568 | #define CHALLENGE_LEN 64 | |
b10d96cb JT |
4569 | |
4570 | /* Return value: | |
4571 | 1 - auth succeeded, | |
4572 | 0 - failed, try again (network error), | |
4573 | -1 - auth failed, don't try again. | |
4574 | */ | |
4575 | ||
13e6037d | 4576 | static int drbd_do_auth(struct drbd_tconn *tconn) |
b411b363 | 4577 | { |
9f5bdc33 | 4578 | struct drbd_socket *sock; |
b411b363 PR |
4579 | char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ |
4580 | struct scatterlist sg; | |
4581 | char *response = NULL; | |
4582 | char *right_response = NULL; | |
4583 | char *peers_ch = NULL; | |
44ed167d PR |
4584 | unsigned int key_len; |
4585 | char secret[SHARED_SECRET_MAX]; /* 64 byte */ | |
b411b363 PR |
4586 | unsigned int resp_size; |
4587 | struct hash_desc desc; | |
77351055 | 4588 | struct packet_info pi; |
44ed167d | 4589 | struct net_conf *nc; |
69bc7bc3 | 4590 | int err, rv; |
b411b363 | 4591 | |
9f5bdc33 AG |
4592 | /* FIXME: Put the challenge/response into the preallocated socket buffer. */ |
4593 | ||
44ed167d PR |
4594 | rcu_read_lock(); |
4595 | nc = rcu_dereference(tconn->net_conf); | |
4596 | key_len = strlen(nc->shared_secret); | |
4597 | memcpy(secret, nc->shared_secret, key_len); | |
4598 | rcu_read_unlock(); | |
4599 | ||
13e6037d | 4600 | desc.tfm = tconn->cram_hmac_tfm; |
b411b363 PR |
4601 | desc.flags = 0; |
4602 | ||
44ed167d | 4603 | rv = crypto_hash_setkey(tconn->cram_hmac_tfm, (u8 *)secret, key_len); |
b411b363 | 4604 | if (rv) { |
13e6037d | 4605 | conn_err(tconn, "crypto_hash_setkey() failed with %d\n", rv); |
b10d96cb | 4606 | rv = -1; |
b411b363 PR |
4607 | goto fail; |
4608 | } | |
4609 | ||
4610 | get_random_bytes(my_challenge, CHALLENGE_LEN); | |
4611 | ||
9f5bdc33 AG |
4612 | sock = &tconn->data; |
4613 | if (!conn_prepare_command(tconn, sock)) { | |
4614 | rv = 0; | |
4615 | goto fail; | |
4616 | } | |
e658983a | 4617 | rv = !conn_send_command(tconn, sock, P_AUTH_CHALLENGE, 0, |
9f5bdc33 | 4618 | my_challenge, CHALLENGE_LEN); |
b411b363 PR |
4619 | if (!rv) |
4620 | goto fail; | |
4621 | ||
69bc7bc3 AG |
4622 | err = drbd_recv_header(tconn, &pi); |
4623 | if (err) { | |
4624 | rv = 0; | |
b411b363 | 4625 | goto fail; |
69bc7bc3 | 4626 | } |
b411b363 | 4627 | |
77351055 | 4628 | if (pi.cmd != P_AUTH_CHALLENGE) { |
13e6037d | 4629 | conn_err(tconn, "expected AuthChallenge packet, received: %s (0x%04x)\n", |
2fcb8f30 | 4630 | cmdname(pi.cmd), pi.cmd); |
b411b363 PR |
4631 | rv = 0; |
4632 | goto fail; | |
4633 | } | |
4634 | ||
77351055 | 4635 | if (pi.size > CHALLENGE_LEN * 2) { |
13e6037d | 4636 | conn_err(tconn, "expected AuthChallenge payload too big.\n"); |
b10d96cb | 4637 | rv = -1; |
b411b363 PR |
4638 | goto fail; |
4639 | } | |
4640 | ||
77351055 | 4641 | peers_ch = kmalloc(pi.size, GFP_NOIO); |
b411b363 | 4642 | if (peers_ch == NULL) { |
13e6037d | 4643 | conn_err(tconn, "kmalloc of peers_ch failed\n"); |
b10d96cb | 4644 | rv = -1; |
b411b363 PR |
4645 | goto fail; |
4646 | } | |
4647 | ||
a5c31904 AG |
4648 | err = drbd_recv_all_warn(tconn, peers_ch, pi.size); |
4649 | if (err) { | |
b411b363 PR |
4650 | rv = 0; |
4651 | goto fail; | |
4652 | } | |
4653 | ||
13e6037d | 4654 | resp_size = crypto_hash_digestsize(tconn->cram_hmac_tfm); |
b411b363 PR |
4655 | response = kmalloc(resp_size, GFP_NOIO); |
4656 | if (response == NULL) { | |
13e6037d | 4657 | conn_err(tconn, "kmalloc of response failed\n"); |
b10d96cb | 4658 | rv = -1; |
b411b363 PR |
4659 | goto fail; |
4660 | } | |
4661 | ||
4662 | sg_init_table(&sg, 1); | |
77351055 | 4663 | sg_set_buf(&sg, peers_ch, pi.size); |
b411b363 PR |
4664 | |
4665 | rv = crypto_hash_digest(&desc, &sg, sg.length, response); | |
4666 | if (rv) { | |
13e6037d | 4667 | conn_err(tconn, "crypto_hash_digest() failed with %d\n", rv); |
b10d96cb | 4668 | rv = -1; |
b411b363 PR |
4669 | goto fail; |
4670 | } | |
4671 | ||
9f5bdc33 AG |
4672 | if (!conn_prepare_command(tconn, sock)) { |
4673 | rv = 0; | |
4674 | goto fail; | |
4675 | } | |
e658983a | 4676 | rv = !conn_send_command(tconn, sock, P_AUTH_RESPONSE, 0, |
9f5bdc33 | 4677 | response, resp_size); |
b411b363 PR |
4678 | if (!rv) |
4679 | goto fail; | |
4680 | ||
69bc7bc3 AG |
4681 | err = drbd_recv_header(tconn, &pi); |
4682 | if (err) { | |
4683 | rv = 0; | |
b411b363 | 4684 | goto fail; |
69bc7bc3 | 4685 | } |
b411b363 | 4686 | |
77351055 | 4687 | if (pi.cmd != P_AUTH_RESPONSE) { |
13e6037d | 4688 | conn_err(tconn, "expected AuthResponse packet, received: %s (0x%04x)\n", |
2fcb8f30 | 4689 | cmdname(pi.cmd), pi.cmd); |
b411b363 PR |
4690 | rv = 0; |
4691 | goto fail; | |
4692 | } | |
4693 | ||
77351055 | 4694 | if (pi.size != resp_size) { |
13e6037d | 4695 | conn_err(tconn, "expected AuthResponse payload of wrong size\n"); |
b411b363 PR |
4696 | rv = 0; |
4697 | goto fail; | |
4698 | } | |
4699 | ||
a5c31904 AG |
4700 | err = drbd_recv_all_warn(tconn, response , resp_size); |
4701 | if (err) { | |
b411b363 PR |
4702 | rv = 0; |
4703 | goto fail; | |
4704 | } | |
4705 | ||
4706 | right_response = kmalloc(resp_size, GFP_NOIO); | |
2d1ee87d | 4707 | if (right_response == NULL) { |
13e6037d | 4708 | conn_err(tconn, "kmalloc of right_response failed\n"); |
b10d96cb | 4709 | rv = -1; |
b411b363 PR |
4710 | goto fail; |
4711 | } | |
4712 | ||
4713 | sg_set_buf(&sg, my_challenge, CHALLENGE_LEN); | |
4714 | ||
4715 | rv = crypto_hash_digest(&desc, &sg, sg.length, right_response); | |
4716 | if (rv) { | |
13e6037d | 4717 | conn_err(tconn, "crypto_hash_digest() failed with %d\n", rv); |
b10d96cb | 4718 | rv = -1; |
b411b363 PR |
4719 | goto fail; |
4720 | } | |
4721 | ||
4722 | rv = !memcmp(response, right_response, resp_size); | |
4723 | ||
4724 | if (rv) | |
44ed167d PR |
4725 | conn_info(tconn, "Peer authenticated using %d bytes HMAC\n", |
4726 | resp_size); | |
b10d96cb JT |
4727 | else |
4728 | rv = -1; | |
b411b363 PR |
4729 | |
4730 | fail: | |
4731 | kfree(peers_ch); | |
4732 | kfree(response); | |
4733 | kfree(right_response); | |
4734 | ||
4735 | return rv; | |
4736 | } | |
4737 | #endif | |
4738 | ||
4739 | int drbdd_init(struct drbd_thread *thi) | |
4740 | { | |
392c8801 | 4741 | struct drbd_tconn *tconn = thi->tconn; |
b411b363 PR |
4742 | int h; |
4743 | ||
4d641dd7 | 4744 | conn_info(tconn, "receiver (re)started\n"); |
b411b363 PR |
4745 | |
4746 | do { | |
81fa2e67 | 4747 | h = conn_connect(tconn); |
b411b363 | 4748 | if (h == 0) { |
81fa2e67 | 4749 | conn_disconnect(tconn); |
20ee6390 | 4750 | schedule_timeout_interruptible(HZ); |
b411b363 PR |
4751 | } |
4752 | if (h == -1) { | |
4d641dd7 | 4753 | conn_warn(tconn, "Discarding network configuration.\n"); |
bbeb641c | 4754 | conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 PR |
4755 | } |
4756 | } while (h == 0); | |
4757 | ||
91fd4dad PR |
4758 | if (h > 0) |
4759 | drbdd(tconn); | |
b411b363 | 4760 | |
81fa2e67 | 4761 | conn_disconnect(tconn); |
b411b363 | 4762 | |
4d641dd7 | 4763 | conn_info(tconn, "receiver terminated\n"); |
b411b363 PR |
4764 | return 0; |
4765 | } | |
4766 | ||
4767 | /* ********* acknowledge sender ******** */ | |
4768 | ||
e05e1e59 | 4769 | static int got_conn_RqSReply(struct drbd_tconn *tconn, struct packet_info *pi) |
e4f78ede | 4770 | { |
e658983a | 4771 | struct p_req_state_reply *p = pi->data; |
e4f78ede PR |
4772 | int retcode = be32_to_cpu(p->retcode); |
4773 | ||
4774 | if (retcode >= SS_SUCCESS) { | |
4775 | set_bit(CONN_WD_ST_CHG_OKAY, &tconn->flags); | |
4776 | } else { | |
4777 | set_bit(CONN_WD_ST_CHG_FAIL, &tconn->flags); | |
4778 | conn_err(tconn, "Requested state change failed by peer: %s (%d)\n", | |
4779 | drbd_set_st_err_str(retcode), retcode); | |
4780 | } | |
4781 | wake_up(&tconn->ping_wait); | |
4782 | ||
2735a594 | 4783 | return 0; |
e4f78ede PR |
4784 | } |
4785 | ||
1952e916 | 4786 | static int got_RqSReply(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4787 | { |
1952e916 | 4788 | struct drbd_conf *mdev; |
e658983a | 4789 | struct p_req_state_reply *p = pi->data; |
b411b363 PR |
4790 | int retcode = be32_to_cpu(p->retcode); |
4791 | ||
1952e916 AG |
4792 | mdev = vnr_to_mdev(tconn, pi->vnr); |
4793 | if (!mdev) | |
2735a594 | 4794 | return -EIO; |
1952e916 | 4795 | |
e4f78ede PR |
4796 | if (retcode >= SS_SUCCESS) { |
4797 | set_bit(CL_ST_CHG_SUCCESS, &mdev->flags); | |
4798 | } else { | |
4799 | set_bit(CL_ST_CHG_FAIL, &mdev->flags); | |
4800 | dev_err(DEV, "Requested state change failed by peer: %s (%d)\n", | |
4801 | drbd_set_st_err_str(retcode), retcode); | |
b411b363 | 4802 | } |
e4f78ede PR |
4803 | wake_up(&mdev->state_wait); |
4804 | ||
2735a594 | 4805 | return 0; |
b411b363 PR |
4806 | } |
4807 | ||
e05e1e59 | 4808 | static int got_Ping(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4809 | { |
2735a594 | 4810 | return drbd_send_ping_ack(tconn); |
b411b363 PR |
4811 | |
4812 | } | |
4813 | ||
e05e1e59 | 4814 | static int got_PingAck(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 PR |
4815 | { |
4816 | /* restore idle timeout */ | |
2a67d8b9 PR |
4817 | tconn->meta.socket->sk->sk_rcvtimeo = tconn->net_conf->ping_int*HZ; |
4818 | if (!test_and_set_bit(GOT_PING_ACK, &tconn->flags)) | |
4819 | wake_up(&tconn->ping_wait); | |
b411b363 | 4820 | |
2735a594 | 4821 | return 0; |
b411b363 PR |
4822 | } |
4823 | ||
1952e916 | 4824 | static int got_IsInSync(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4825 | { |
1952e916 | 4826 | struct drbd_conf *mdev; |
e658983a | 4827 | struct p_block_ack *p = pi->data; |
b411b363 PR |
4828 | sector_t sector = be64_to_cpu(p->sector); |
4829 | int blksize = be32_to_cpu(p->blksize); | |
4830 | ||
1952e916 AG |
4831 | mdev = vnr_to_mdev(tconn, pi->vnr); |
4832 | if (!mdev) | |
2735a594 | 4833 | return -EIO; |
1952e916 | 4834 | |
31890f4a | 4835 | D_ASSERT(mdev->tconn->agreed_pro_version >= 89); |
b411b363 PR |
4836 | |
4837 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
4838 | ||
1d53f09e LE |
4839 | if (get_ldev(mdev)) { |
4840 | drbd_rs_complete_io(mdev, sector); | |
4841 | drbd_set_in_sync(mdev, sector, blksize); | |
4842 | /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ | |
4843 | mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); | |
4844 | put_ldev(mdev); | |
4845 | } | |
b411b363 | 4846 | dec_rs_pending(mdev); |
778f271d | 4847 | atomic_add(blksize >> 9, &mdev->rs_sect_in); |
b411b363 | 4848 | |
2735a594 | 4849 | return 0; |
b411b363 PR |
4850 | } |
4851 | ||
bc9c5c41 AG |
4852 | static int |
4853 | validate_req_change_req_state(struct drbd_conf *mdev, u64 id, sector_t sector, | |
4854 | struct rb_root *root, const char *func, | |
4855 | enum drbd_req_event what, bool missing_ok) | |
b411b363 PR |
4856 | { |
4857 | struct drbd_request *req; | |
4858 | struct bio_and_error m; | |
4859 | ||
87eeee41 | 4860 | spin_lock_irq(&mdev->tconn->req_lock); |
bc9c5c41 | 4861 | req = find_request(mdev, root, id, sector, missing_ok, func); |
b411b363 | 4862 | if (unlikely(!req)) { |
87eeee41 | 4863 | spin_unlock_irq(&mdev->tconn->req_lock); |
85997675 | 4864 | return -EIO; |
b411b363 PR |
4865 | } |
4866 | __req_mod(req, what, &m); | |
87eeee41 | 4867 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
4868 | |
4869 | if (m.bio) | |
4870 | complete_master_bio(mdev, &m); | |
85997675 | 4871 | return 0; |
b411b363 PR |
4872 | } |
4873 | ||
1952e916 | 4874 | static int got_BlockAck(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4875 | { |
1952e916 | 4876 | struct drbd_conf *mdev; |
e658983a | 4877 | struct p_block_ack *p = pi->data; |
b411b363 PR |
4878 | sector_t sector = be64_to_cpu(p->sector); |
4879 | int blksize = be32_to_cpu(p->blksize); | |
4880 | enum drbd_req_event what; | |
4881 | ||
1952e916 AG |
4882 | mdev = vnr_to_mdev(tconn, pi->vnr); |
4883 | if (!mdev) | |
2735a594 | 4884 | return -EIO; |
1952e916 | 4885 | |
b411b363 PR |
4886 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); |
4887 | ||
579b57ed | 4888 | if (p->block_id == ID_SYNCER) { |
b411b363 PR |
4889 | drbd_set_in_sync(mdev, sector, blksize); |
4890 | dec_rs_pending(mdev); | |
2735a594 | 4891 | return 0; |
b411b363 | 4892 | } |
e05e1e59 | 4893 | switch (pi->cmd) { |
b411b363 | 4894 | case P_RS_WRITE_ACK: |
8554df1c | 4895 | what = WRITE_ACKED_BY_PEER_AND_SIS; |
b411b363 PR |
4896 | break; |
4897 | case P_WRITE_ACK: | |
8554df1c | 4898 | what = WRITE_ACKED_BY_PEER; |
b411b363 PR |
4899 | break; |
4900 | case P_RECV_ACK: | |
8554df1c | 4901 | what = RECV_ACKED_BY_PEER; |
b411b363 | 4902 | break; |
7be8da07 | 4903 | case P_DISCARD_WRITE: |
7be8da07 AG |
4904 | what = DISCARD_WRITE; |
4905 | break; | |
4906 | case P_RETRY_WRITE: | |
7be8da07 | 4907 | what = POSTPONE_WRITE; |
b411b363 PR |
4908 | break; |
4909 | default: | |
2735a594 | 4910 | BUG(); |
b411b363 PR |
4911 | } |
4912 | ||
2735a594 AG |
4913 | return validate_req_change_req_state(mdev, p->block_id, sector, |
4914 | &mdev->write_requests, __func__, | |
4915 | what, false); | |
b411b363 PR |
4916 | } |
4917 | ||
1952e916 | 4918 | static int got_NegAck(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4919 | { |
1952e916 | 4920 | struct drbd_conf *mdev; |
e658983a | 4921 | struct p_block_ack *p = pi->data; |
b411b363 | 4922 | sector_t sector = be64_to_cpu(p->sector); |
2deb8336 | 4923 | int size = be32_to_cpu(p->blksize); |
85997675 | 4924 | int err; |
b411b363 | 4925 | |
1952e916 AG |
4926 | mdev = vnr_to_mdev(tconn, pi->vnr); |
4927 | if (!mdev) | |
2735a594 | 4928 | return -EIO; |
1952e916 | 4929 | |
b411b363 PR |
4930 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); |
4931 | ||
579b57ed | 4932 | if (p->block_id == ID_SYNCER) { |
b411b363 PR |
4933 | dec_rs_pending(mdev); |
4934 | drbd_rs_failed_io(mdev, sector, size); | |
2735a594 | 4935 | return 0; |
b411b363 | 4936 | } |
2deb8336 | 4937 | |
85997675 AG |
4938 | err = validate_req_change_req_state(mdev, p->block_id, sector, |
4939 | &mdev->write_requests, __func__, | |
303d1448 | 4940 | NEG_ACKED, true); |
85997675 | 4941 | if (err) { |
c3afd8f5 AG |
4942 | /* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs. |
4943 | The master bio might already be completed, therefore the | |
4944 | request is no longer in the collision hash. */ | |
4945 | /* In Protocol B we might already have got a P_RECV_ACK | |
4946 | but then get a P_NEG_ACK afterwards. */ | |
c3afd8f5 | 4947 | drbd_set_out_of_sync(mdev, sector, size); |
2deb8336 | 4948 | } |
2735a594 | 4949 | return 0; |
b411b363 PR |
4950 | } |
4951 | ||
1952e916 | 4952 | static int got_NegDReply(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4953 | { |
1952e916 | 4954 | struct drbd_conf *mdev; |
e658983a | 4955 | struct p_block_ack *p = pi->data; |
b411b363 PR |
4956 | sector_t sector = be64_to_cpu(p->sector); |
4957 | ||
1952e916 AG |
4958 | mdev = vnr_to_mdev(tconn, pi->vnr); |
4959 | if (!mdev) | |
2735a594 | 4960 | return -EIO; |
1952e916 | 4961 | |
b411b363 | 4962 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); |
7be8da07 | 4963 | |
b411b363 PR |
4964 | dev_err(DEV, "Got NegDReply; Sector %llus, len %u; Fail original request.\n", |
4965 | (unsigned long long)sector, be32_to_cpu(p->blksize)); | |
4966 | ||
2735a594 AG |
4967 | return validate_req_change_req_state(mdev, p->block_id, sector, |
4968 | &mdev->read_requests, __func__, | |
4969 | NEG_ACKED, false); | |
b411b363 PR |
4970 | } |
4971 | ||
1952e916 | 4972 | static int got_NegRSDReply(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4973 | { |
1952e916 | 4974 | struct drbd_conf *mdev; |
b411b363 PR |
4975 | sector_t sector; |
4976 | int size; | |
e658983a | 4977 | struct p_block_ack *p = pi->data; |
1952e916 AG |
4978 | |
4979 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
4980 | if (!mdev) | |
2735a594 | 4981 | return -EIO; |
b411b363 PR |
4982 | |
4983 | sector = be64_to_cpu(p->sector); | |
4984 | size = be32_to_cpu(p->blksize); | |
b411b363 PR |
4985 | |
4986 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
4987 | ||
4988 | dec_rs_pending(mdev); | |
4989 | ||
4990 | if (get_ldev_if_state(mdev, D_FAILED)) { | |
4991 | drbd_rs_complete_io(mdev, sector); | |
e05e1e59 | 4992 | switch (pi->cmd) { |
d612d309 PR |
4993 | case P_NEG_RS_DREPLY: |
4994 | drbd_rs_failed_io(mdev, sector, size); | |
4995 | case P_RS_CANCEL: | |
4996 | break; | |
4997 | default: | |
2735a594 | 4998 | BUG(); |
d612d309 | 4999 | } |
b411b363 PR |
5000 | put_ldev(mdev); |
5001 | } | |
5002 | ||
2735a594 | 5003 | return 0; |
b411b363 PR |
5004 | } |
5005 | ||
1952e916 | 5006 | static int got_BarrierAck(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 5007 | { |
1952e916 | 5008 | struct drbd_conf *mdev; |
e658983a | 5009 | struct p_barrier_ack *p = pi->data; |
1952e916 AG |
5010 | |
5011 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
5012 | if (!mdev) | |
2735a594 | 5013 | return -EIO; |
b411b363 | 5014 | |
2f5cdd0b | 5015 | tl_release(mdev->tconn, p->barrier, be32_to_cpu(p->set_size)); |
b411b363 | 5016 | |
c4752ef1 PR |
5017 | if (mdev->state.conn == C_AHEAD && |
5018 | atomic_read(&mdev->ap_in_flight) == 0 && | |
36baf611 | 5019 | !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &mdev->flags)) { |
370a43e7 PR |
5020 | mdev->start_resync_timer.expires = jiffies + HZ; |
5021 | add_timer(&mdev->start_resync_timer); | |
c4752ef1 PR |
5022 | } |
5023 | ||
2735a594 | 5024 | return 0; |
b411b363 PR |
5025 | } |
5026 | ||
1952e916 | 5027 | static int got_OVResult(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 5028 | { |
1952e916 | 5029 | struct drbd_conf *mdev; |
e658983a | 5030 | struct p_block_ack *p = pi->data; |
b411b363 PR |
5031 | struct drbd_work *w; |
5032 | sector_t sector; | |
5033 | int size; | |
5034 | ||
1952e916 AG |
5035 | mdev = vnr_to_mdev(tconn, pi->vnr); |
5036 | if (!mdev) | |
2735a594 | 5037 | return -EIO; |
1952e916 | 5038 | |
b411b363 PR |
5039 | sector = be64_to_cpu(p->sector); |
5040 | size = be32_to_cpu(p->blksize); | |
5041 | ||
5042 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
5043 | ||
5044 | if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) | |
8f7bed77 | 5045 | drbd_ov_out_of_sync_found(mdev, sector, size); |
b411b363 | 5046 | else |
8f7bed77 | 5047 | ov_out_of_sync_print(mdev); |
b411b363 | 5048 | |
1d53f09e | 5049 | if (!get_ldev(mdev)) |
2735a594 | 5050 | return 0; |
1d53f09e | 5051 | |
b411b363 PR |
5052 | drbd_rs_complete_io(mdev, sector); |
5053 | dec_rs_pending(mdev); | |
5054 | ||
ea5442af LE |
5055 | --mdev->ov_left; |
5056 | ||
5057 | /* let's advance progress step marks only for every other megabyte */ | |
5058 | if ((mdev->ov_left & 0x200) == 0x200) | |
5059 | drbd_advance_rs_marks(mdev, mdev->ov_left); | |
5060 | ||
5061 | if (mdev->ov_left == 0) { | |
b411b363 PR |
5062 | w = kmalloc(sizeof(*w), GFP_NOIO); |
5063 | if (w) { | |
5064 | w->cb = w_ov_finished; | |
a21e9298 | 5065 | w->mdev = mdev; |
e42325a5 | 5066 | drbd_queue_work_front(&mdev->tconn->data.work, w); |
b411b363 PR |
5067 | } else { |
5068 | dev_err(DEV, "kmalloc(w) failed."); | |
8f7bed77 | 5069 | ov_out_of_sync_print(mdev); |
b411b363 PR |
5070 | drbd_resync_finished(mdev); |
5071 | } | |
5072 | } | |
1d53f09e | 5073 | put_ldev(mdev); |
2735a594 | 5074 | return 0; |
b411b363 PR |
5075 | } |
5076 | ||
1952e916 | 5077 | static int got_skip(struct drbd_tconn *tconn, struct packet_info *pi) |
0ced55a3 | 5078 | { |
2735a594 | 5079 | return 0; |
0ced55a3 PR |
5080 | } |
5081 | ||
a990be46 | 5082 | static int tconn_finish_peer_reqs(struct drbd_tconn *tconn) |
32862ec7 | 5083 | { |
082a3439 | 5084 | struct drbd_conf *mdev; |
c141ebda | 5085 | int vnr, not_empty = 0; |
32862ec7 PR |
5086 | |
5087 | do { | |
5088 | clear_bit(SIGNAL_ASENDER, &tconn->flags); | |
5089 | flush_signals(current); | |
c141ebda PR |
5090 | |
5091 | rcu_read_lock(); | |
5092 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { | |
5093 | kref_get(&mdev->kref); | |
5094 | rcu_read_unlock(); | |
d3fcb490 | 5095 | if (drbd_finish_peer_reqs(mdev)) { |
c141ebda PR |
5096 | kref_put(&mdev->kref, &drbd_minor_destroy); |
5097 | return 1; | |
d3fcb490 | 5098 | } |
c141ebda PR |
5099 | kref_put(&mdev->kref, &drbd_minor_destroy); |
5100 | rcu_read_lock(); | |
082a3439 | 5101 | } |
32862ec7 | 5102 | set_bit(SIGNAL_ASENDER, &tconn->flags); |
082a3439 PR |
5103 | |
5104 | spin_lock_irq(&tconn->req_lock); | |
c141ebda | 5105 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { |
082a3439 PR |
5106 | not_empty = !list_empty(&mdev->done_ee); |
5107 | if (not_empty) | |
5108 | break; | |
5109 | } | |
5110 | spin_unlock_irq(&tconn->req_lock); | |
c141ebda | 5111 | rcu_read_unlock(); |
32862ec7 PR |
5112 | } while (not_empty); |
5113 | ||
5114 | return 0; | |
5115 | } | |
5116 | ||
7201b972 AG |
5117 | struct asender_cmd { |
5118 | size_t pkt_size; | |
1952e916 | 5119 | int (*fn)(struct drbd_tconn *tconn, struct packet_info *); |
7201b972 AG |
5120 | }; |
5121 | ||
5122 | static struct asender_cmd asender_tbl[] = { | |
e658983a AG |
5123 | [P_PING] = { 0, got_Ping }, |
5124 | [P_PING_ACK] = { 0, got_PingAck }, | |
1952e916 AG |
5125 | [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, |
5126 | [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, | |
5127 | [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, | |
5128 | [P_DISCARD_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, | |
5129 | [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, | |
5130 | [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, | |
5131 | [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply }, | |
5132 | [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, | |
5133 | [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, | |
5134 | [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, | |
5135 | [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, | |
5136 | [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip }, | |
5137 | [P_RS_CANCEL] = { sizeof(struct p_block_ack), got_NegRSDReply }, | |
5138 | [P_CONN_ST_CHG_REPLY]={ sizeof(struct p_req_state_reply), got_conn_RqSReply }, | |
5139 | [P_RETRY_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, | |
7201b972 AG |
5140 | }; |
5141 | ||
b411b363 PR |
5142 | int drbd_asender(struct drbd_thread *thi) |
5143 | { | |
392c8801 | 5144 | struct drbd_tconn *tconn = thi->tconn; |
b411b363 | 5145 | struct asender_cmd *cmd = NULL; |
77351055 | 5146 | struct packet_info pi; |
257d0af6 | 5147 | int rv; |
e658983a | 5148 | void *buf = tconn->meta.rbuf; |
b411b363 | 5149 | int received = 0; |
52b061a4 AG |
5150 | unsigned int header_size = drbd_header_size(tconn); |
5151 | int expect = header_size; | |
44ed167d PR |
5152 | bool ping_timeout_active = false; |
5153 | struct net_conf *nc; | |
bb77d34e | 5154 | int ping_timeo, tcp_cork, ping_int; |
b411b363 | 5155 | |
b411b363 PR |
5156 | current->policy = SCHED_RR; /* Make this a realtime task! */ |
5157 | current->rt_priority = 2; /* more important than all other tasks */ | |
5158 | ||
e77a0a5c | 5159 | while (get_t_state(thi) == RUNNING) { |
80822284 | 5160 | drbd_thread_current_set_cpu(thi); |
44ed167d PR |
5161 | |
5162 | rcu_read_lock(); | |
5163 | nc = rcu_dereference(tconn->net_conf); | |
5164 | ping_timeo = nc->ping_timeo; | |
bb77d34e | 5165 | tcp_cork = nc->tcp_cork; |
44ed167d PR |
5166 | ping_int = nc->ping_int; |
5167 | rcu_read_unlock(); | |
5168 | ||
32862ec7 | 5169 | if (test_and_clear_bit(SEND_PING, &tconn->flags)) { |
a17647aa | 5170 | if (drbd_send_ping(tconn)) { |
32862ec7 | 5171 | conn_err(tconn, "drbd_send_ping has failed\n"); |
841ce241 AG |
5172 | goto reconnect; |
5173 | } | |
44ed167d PR |
5174 | tconn->meta.socket->sk->sk_rcvtimeo = ping_timeo * HZ / 10; |
5175 | ping_timeout_active = true; | |
b411b363 PR |
5176 | } |
5177 | ||
32862ec7 PR |
5178 | /* TODO: conditionally cork; it may hurt latency if we cork without |
5179 | much to send */ | |
bb77d34e | 5180 | if (tcp_cork) |
32862ec7 | 5181 | drbd_tcp_cork(tconn->meta.socket); |
a990be46 AG |
5182 | if (tconn_finish_peer_reqs(tconn)) { |
5183 | conn_err(tconn, "tconn_finish_peer_reqs() failed\n"); | |
32862ec7 | 5184 | goto reconnect; |
082a3439 | 5185 | } |
b411b363 | 5186 | /* but unconditionally uncork unless disabled */ |
bb77d34e | 5187 | if (tcp_cork) |
32862ec7 | 5188 | drbd_tcp_uncork(tconn->meta.socket); |
b411b363 PR |
5189 | |
5190 | /* short circuit, recv_msg would return EINTR anyways. */ | |
5191 | if (signal_pending(current)) | |
5192 | continue; | |
5193 | ||
32862ec7 PR |
5194 | rv = drbd_recv_short(tconn->meta.socket, buf, expect-received, 0); |
5195 | clear_bit(SIGNAL_ASENDER, &tconn->flags); | |
b411b363 PR |
5196 | |
5197 | flush_signals(current); | |
5198 | ||
5199 | /* Note: | |
5200 | * -EINTR (on meta) we got a signal | |
5201 | * -EAGAIN (on meta) rcvtimeo expired | |
5202 | * -ECONNRESET other side closed the connection | |
5203 | * -ERESTARTSYS (on data) we got a signal | |
5204 | * rv < 0 other than above: unexpected error! | |
5205 | * rv == expected: full header or command | |
5206 | * rv < expected: "woken" by signal during receive | |
5207 | * rv == 0 : "connection shut down by peer" | |
5208 | */ | |
5209 | if (likely(rv > 0)) { | |
5210 | received += rv; | |
5211 | buf += rv; | |
5212 | } else if (rv == 0) { | |
32862ec7 | 5213 | conn_err(tconn, "meta connection shut down by peer.\n"); |
b411b363 PR |
5214 | goto reconnect; |
5215 | } else if (rv == -EAGAIN) { | |
cb6518cb LE |
5216 | /* If the data socket received something meanwhile, |
5217 | * that is good enough: peer is still alive. */ | |
32862ec7 PR |
5218 | if (time_after(tconn->last_received, |
5219 | jiffies - tconn->meta.socket->sk->sk_rcvtimeo)) | |
cb6518cb | 5220 | continue; |
f36af18c | 5221 | if (ping_timeout_active) { |
32862ec7 | 5222 | conn_err(tconn, "PingAck did not arrive in time.\n"); |
b411b363 PR |
5223 | goto reconnect; |
5224 | } | |
32862ec7 | 5225 | set_bit(SEND_PING, &tconn->flags); |
b411b363 PR |
5226 | continue; |
5227 | } else if (rv == -EINTR) { | |
5228 | continue; | |
5229 | } else { | |
32862ec7 | 5230 | conn_err(tconn, "sock_recvmsg returned %d\n", rv); |
b411b363 PR |
5231 | goto reconnect; |
5232 | } | |
5233 | ||
5234 | if (received == expect && cmd == NULL) { | |
e658983a | 5235 | if (decode_header(tconn, tconn->meta.rbuf, &pi)) |
b411b363 | 5236 | goto reconnect; |
7201b972 | 5237 | cmd = &asender_tbl[pi.cmd]; |
1952e916 | 5238 | if (pi.cmd >= ARRAY_SIZE(asender_tbl) || !cmd->fn) { |
2fcb8f30 AG |
5239 | conn_err(tconn, "Unexpected meta packet %s (0x%04x)\n", |
5240 | cmdname(pi.cmd), pi.cmd); | |
b411b363 PR |
5241 | goto disconnect; |
5242 | } | |
e658983a | 5243 | expect = header_size + cmd->pkt_size; |
52b061a4 | 5244 | if (pi.size != expect - header_size) { |
32862ec7 | 5245 | conn_err(tconn, "Wrong packet size on meta (c: %d, l: %d)\n", |
77351055 | 5246 | pi.cmd, pi.size); |
b411b363 | 5247 | goto reconnect; |
257d0af6 | 5248 | } |
b411b363 PR |
5249 | } |
5250 | if (received == expect) { | |
2735a594 | 5251 | bool err; |
a4fbda8e | 5252 | |
2735a594 AG |
5253 | err = cmd->fn(tconn, &pi); |
5254 | if (err) { | |
1952e916 | 5255 | conn_err(tconn, "%pf failed\n", cmd->fn); |
b411b363 | 5256 | goto reconnect; |
1952e916 | 5257 | } |
b411b363 | 5258 | |
a4fbda8e PR |
5259 | tconn->last_received = jiffies; |
5260 | ||
44ed167d PR |
5261 | if (cmd == &asender_tbl[P_PING_ACK]) { |
5262 | /* restore idle timeout */ | |
5263 | tconn->meta.socket->sk->sk_rcvtimeo = ping_int * HZ; | |
5264 | ping_timeout_active = false; | |
5265 | } | |
f36af18c | 5266 | |
e658983a | 5267 | buf = tconn->meta.rbuf; |
b411b363 | 5268 | received = 0; |
52b061a4 | 5269 | expect = header_size; |
b411b363 PR |
5270 | cmd = NULL; |
5271 | } | |
5272 | } | |
5273 | ||
5274 | if (0) { | |
5275 | reconnect: | |
bbeb641c | 5276 | conn_request_state(tconn, NS(conn, C_NETWORK_FAILURE), CS_HARD); |
b411b363 PR |
5277 | } |
5278 | if (0) { | |
5279 | disconnect: | |
bbeb641c | 5280 | conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 | 5281 | } |
32862ec7 | 5282 | clear_bit(SIGNAL_ASENDER, &tconn->flags); |
b411b363 | 5283 | |
32862ec7 | 5284 | conn_info(tconn, "asender terminated\n"); |
b411b363 PR |
5285 | |
5286 | return 0; | |
5287 | } |