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Commit | Line | Data |
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b411b363 PR |
1 | /* |
2 | drbd_receiver.c | |
3 | ||
4 | This file is part of DRBD by Philipp Reisner and Lars Ellenberg. | |
5 | ||
6 | Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. | |
7 | Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>. | |
8 | Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. | |
9 | ||
10 | drbd is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 2, or (at your option) | |
13 | any later version. | |
14 | ||
15 | drbd is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
21 | along with drbd; see the file COPYING. If not, write to | |
22 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
23 | */ | |
24 | ||
25 | ||
b411b363 PR |
26 | #include <linux/module.h> |
27 | ||
28 | #include <asm/uaccess.h> | |
29 | #include <net/sock.h> | |
30 | ||
b411b363 PR |
31 | #include <linux/drbd.h> |
32 | #include <linux/fs.h> | |
33 | #include <linux/file.h> | |
34 | #include <linux/in.h> | |
35 | #include <linux/mm.h> | |
36 | #include <linux/memcontrol.h> | |
37 | #include <linux/mm_inline.h> | |
38 | #include <linux/slab.h> | |
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 | |
81a3537a LE |
298 | if (page == NULL) |
299 | return; | |
300 | ||
81a5d60e | 301 | if (drbd_pp_vacant > (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * minor_count) |
45bb912b LE |
302 | i = page_chain_free(page); |
303 | else { | |
304 | struct page *tmp; | |
305 | tmp = page_chain_tail(page, &i); | |
306 | spin_lock(&drbd_pp_lock); | |
307 | page_chain_add(&drbd_pp_pool, page, tmp); | |
308 | drbd_pp_vacant += i; | |
309 | spin_unlock(&drbd_pp_lock); | |
b411b363 | 310 | } |
435f0740 | 311 | i = atomic_sub_return(i, a); |
45bb912b | 312 | if (i < 0) |
435f0740 LE |
313 | dev_warn(DEV, "ASSERTION FAILED: %s: %d < 0\n", |
314 | is_net ? "pp_in_use_by_net" : "pp_in_use", i); | |
b411b363 PR |
315 | wake_up(&drbd_pp_wait); |
316 | } | |
317 | ||
318 | /* | |
319 | You need to hold the req_lock: | |
320 | _drbd_wait_ee_list_empty() | |
321 | ||
322 | You must not have the req_lock: | |
3967deb1 | 323 | drbd_free_peer_req() |
0db55363 | 324 | drbd_alloc_peer_req() |
7721f567 | 325 | drbd_free_peer_reqs() |
b411b363 | 326 | drbd_ee_fix_bhs() |
a990be46 | 327 | drbd_finish_peer_reqs() |
b411b363 PR |
328 | drbd_clear_done_ee() |
329 | drbd_wait_ee_list_empty() | |
330 | */ | |
331 | ||
f6ffca9f | 332 | struct drbd_peer_request * |
0db55363 AG |
333 | drbd_alloc_peer_req(struct drbd_conf *mdev, u64 id, sector_t sector, |
334 | unsigned int data_size, gfp_t gfp_mask) __must_hold(local) | |
b411b363 | 335 | { |
db830c46 | 336 | struct drbd_peer_request *peer_req; |
81a3537a | 337 | struct page *page = NULL; |
45bb912b | 338 | unsigned nr_pages = (data_size + PAGE_SIZE -1) >> PAGE_SHIFT; |
b411b363 | 339 | |
0cf9d27e | 340 | if (drbd_insert_fault(mdev, DRBD_FAULT_AL_EE)) |
b411b363 PR |
341 | return NULL; |
342 | ||
db830c46 AG |
343 | peer_req = mempool_alloc(drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM); |
344 | if (!peer_req) { | |
b411b363 | 345 | if (!(gfp_mask & __GFP_NOWARN)) |
0db55363 | 346 | dev_err(DEV, "%s: allocation failed\n", __func__); |
b411b363 PR |
347 | return NULL; |
348 | } | |
349 | ||
81a3537a LE |
350 | if (data_size) { |
351 | page = drbd_alloc_pages(mdev, nr_pages, (gfp_mask & __GFP_WAIT)); | |
352 | if (!page) | |
353 | goto fail; | |
354 | } | |
b411b363 | 355 | |
db830c46 AG |
356 | drbd_clear_interval(&peer_req->i); |
357 | peer_req->i.size = data_size; | |
358 | peer_req->i.sector = sector; | |
359 | peer_req->i.local = false; | |
360 | peer_req->i.waiting = false; | |
361 | ||
362 | peer_req->epoch = NULL; | |
a21e9298 | 363 | peer_req->w.mdev = mdev; |
db830c46 AG |
364 | peer_req->pages = page; |
365 | atomic_set(&peer_req->pending_bios, 0); | |
366 | peer_req->flags = 0; | |
9a8e7753 AG |
367 | /* |
368 | * The block_id is opaque to the receiver. It is not endianness | |
369 | * converted, and sent back to the sender unchanged. | |
370 | */ | |
db830c46 | 371 | peer_req->block_id = id; |
b411b363 | 372 | |
db830c46 | 373 | return peer_req; |
b411b363 | 374 | |
45bb912b | 375 | fail: |
db830c46 | 376 | mempool_free(peer_req, drbd_ee_mempool); |
b411b363 PR |
377 | return NULL; |
378 | } | |
379 | ||
3967deb1 | 380 | void __drbd_free_peer_req(struct drbd_conf *mdev, struct drbd_peer_request *peer_req, |
f6ffca9f | 381 | int is_net) |
b411b363 | 382 | { |
db830c46 AG |
383 | if (peer_req->flags & EE_HAS_DIGEST) |
384 | kfree(peer_req->digest); | |
5cc287e0 | 385 | drbd_free_pages(mdev, peer_req->pages, is_net); |
db830c46 AG |
386 | D_ASSERT(atomic_read(&peer_req->pending_bios) == 0); |
387 | D_ASSERT(drbd_interval_empty(&peer_req->i)); | |
388 | mempool_free(peer_req, drbd_ee_mempool); | |
b411b363 PR |
389 | } |
390 | ||
7721f567 | 391 | int drbd_free_peer_reqs(struct drbd_conf *mdev, struct list_head *list) |
b411b363 PR |
392 | { |
393 | LIST_HEAD(work_list); | |
db830c46 | 394 | struct drbd_peer_request *peer_req, *t; |
b411b363 | 395 | int count = 0; |
435f0740 | 396 | int is_net = list == &mdev->net_ee; |
b411b363 | 397 | |
87eeee41 | 398 | spin_lock_irq(&mdev->tconn->req_lock); |
b411b363 | 399 | list_splice_init(list, &work_list); |
87eeee41 | 400 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 401 | |
db830c46 | 402 | list_for_each_entry_safe(peer_req, t, &work_list, w.list) { |
3967deb1 | 403 | __drbd_free_peer_req(mdev, peer_req, is_net); |
b411b363 PR |
404 | count++; |
405 | } | |
406 | return count; | |
407 | } | |
408 | ||
a990be46 AG |
409 | /* |
410 | * See also comments in _req_mod(,BARRIER_ACKED) and receive_Barrier. | |
b411b363 | 411 | */ |
a990be46 | 412 | static int drbd_finish_peer_reqs(struct drbd_conf *mdev) |
b411b363 PR |
413 | { |
414 | LIST_HEAD(work_list); | |
415 | LIST_HEAD(reclaimed); | |
db830c46 | 416 | struct drbd_peer_request *peer_req, *t; |
e2b3032b | 417 | int err = 0; |
b411b363 | 418 | |
87eeee41 | 419 | spin_lock_irq(&mdev->tconn->req_lock); |
a990be46 | 420 | reclaim_finished_net_peer_reqs(mdev, &reclaimed); |
b411b363 | 421 | list_splice_init(&mdev->done_ee, &work_list); |
87eeee41 | 422 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 423 | |
db830c46 | 424 | list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) |
3967deb1 | 425 | drbd_free_net_peer_req(mdev, peer_req); |
b411b363 PR |
426 | |
427 | /* possible callbacks here: | |
7be8da07 | 428 | * e_end_block, and e_end_resync_block, e_send_discard_write. |
b411b363 PR |
429 | * all ignore the last argument. |
430 | */ | |
db830c46 | 431 | list_for_each_entry_safe(peer_req, t, &work_list, w.list) { |
e2b3032b AG |
432 | int err2; |
433 | ||
b411b363 | 434 | /* list_del not necessary, next/prev members not touched */ |
e2b3032b AG |
435 | err2 = peer_req->w.cb(&peer_req->w, !!err); |
436 | if (!err) | |
437 | err = err2; | |
3967deb1 | 438 | drbd_free_peer_req(mdev, peer_req); |
b411b363 PR |
439 | } |
440 | wake_up(&mdev->ee_wait); | |
441 | ||
e2b3032b | 442 | return err; |
b411b363 PR |
443 | } |
444 | ||
d4da1537 AG |
445 | static void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, |
446 | struct list_head *head) | |
b411b363 PR |
447 | { |
448 | DEFINE_WAIT(wait); | |
449 | ||
450 | /* avoids spin_lock/unlock | |
451 | * and calling prepare_to_wait in the fast path */ | |
452 | while (!list_empty(head)) { | |
453 | prepare_to_wait(&mdev->ee_wait, &wait, TASK_UNINTERRUPTIBLE); | |
87eeee41 | 454 | spin_unlock_irq(&mdev->tconn->req_lock); |
7eaceacc | 455 | io_schedule(); |
b411b363 | 456 | finish_wait(&mdev->ee_wait, &wait); |
87eeee41 | 457 | spin_lock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
458 | } |
459 | } | |
460 | ||
d4da1537 AG |
461 | static void drbd_wait_ee_list_empty(struct drbd_conf *mdev, |
462 | struct list_head *head) | |
b411b363 | 463 | { |
87eeee41 | 464 | spin_lock_irq(&mdev->tconn->req_lock); |
b411b363 | 465 | _drbd_wait_ee_list_empty(mdev, head); |
87eeee41 | 466 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
467 | } |
468 | ||
dbd9eea0 | 469 | static int drbd_recv_short(struct socket *sock, void *buf, size_t size, int flags) |
b411b363 PR |
470 | { |
471 | mm_segment_t oldfs; | |
472 | struct kvec iov = { | |
473 | .iov_base = buf, | |
474 | .iov_len = size, | |
475 | }; | |
476 | struct msghdr msg = { | |
477 | .msg_iovlen = 1, | |
478 | .msg_iov = (struct iovec *)&iov, | |
479 | .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) | |
480 | }; | |
481 | int rv; | |
482 | ||
483 | oldfs = get_fs(); | |
484 | set_fs(KERNEL_DS); | |
485 | rv = sock_recvmsg(sock, &msg, size, msg.msg_flags); | |
486 | set_fs(oldfs); | |
487 | ||
488 | return rv; | |
489 | } | |
490 | ||
de0ff338 | 491 | static int drbd_recv(struct drbd_tconn *tconn, void *buf, size_t size) |
b411b363 PR |
492 | { |
493 | mm_segment_t oldfs; | |
494 | struct kvec iov = { | |
495 | .iov_base = buf, | |
496 | .iov_len = size, | |
497 | }; | |
498 | struct msghdr msg = { | |
499 | .msg_iovlen = 1, | |
500 | .msg_iov = (struct iovec *)&iov, | |
501 | .msg_flags = MSG_WAITALL | MSG_NOSIGNAL | |
502 | }; | |
503 | int rv; | |
504 | ||
505 | oldfs = get_fs(); | |
506 | set_fs(KERNEL_DS); | |
507 | ||
508 | for (;;) { | |
de0ff338 | 509 | rv = sock_recvmsg(tconn->data.socket, &msg, size, msg.msg_flags); |
b411b363 PR |
510 | if (rv == size) |
511 | break; | |
512 | ||
513 | /* Note: | |
514 | * ECONNRESET other side closed the connection | |
515 | * ERESTARTSYS (on sock) we got a signal | |
516 | */ | |
517 | ||
518 | if (rv < 0) { | |
519 | if (rv == -ECONNRESET) | |
de0ff338 | 520 | conn_info(tconn, "sock was reset by peer\n"); |
b411b363 | 521 | else if (rv != -ERESTARTSYS) |
de0ff338 | 522 | conn_err(tconn, "sock_recvmsg returned %d\n", rv); |
b411b363 PR |
523 | break; |
524 | } else if (rv == 0) { | |
de0ff338 | 525 | conn_info(tconn, "sock was shut down by peer\n"); |
b411b363 PR |
526 | break; |
527 | } else { | |
528 | /* signal came in, or peer/link went down, | |
529 | * after we read a partial message | |
530 | */ | |
531 | /* D_ASSERT(signal_pending(current)); */ | |
532 | break; | |
533 | } | |
534 | }; | |
535 | ||
536 | set_fs(oldfs); | |
537 | ||
538 | if (rv != size) | |
bbeb641c | 539 | conn_request_state(tconn, NS(conn, C_BROKEN_PIPE), CS_HARD); |
b411b363 PR |
540 | |
541 | return rv; | |
542 | } | |
543 | ||
c6967746 AG |
544 | static int drbd_recv_all(struct drbd_tconn *tconn, void *buf, size_t size) |
545 | { | |
546 | int err; | |
547 | ||
548 | err = drbd_recv(tconn, buf, size); | |
549 | if (err != size) { | |
550 | if (err >= 0) | |
551 | err = -EIO; | |
552 | } else | |
553 | err = 0; | |
554 | return err; | |
555 | } | |
556 | ||
a5c31904 AG |
557 | static int drbd_recv_all_warn(struct drbd_tconn *tconn, void *buf, size_t size) |
558 | { | |
559 | int err; | |
560 | ||
561 | err = drbd_recv_all(tconn, buf, size); | |
562 | if (err && !signal_pending(current)) | |
563 | conn_warn(tconn, "short read (expected size %d)\n", (int)size); | |
564 | return err; | |
565 | } | |
566 | ||
5dbf1673 LE |
567 | /* quoting tcp(7): |
568 | * On individual connections, the socket buffer size must be set prior to the | |
569 | * listen(2) or connect(2) calls in order to have it take effect. | |
570 | * This is our wrapper to do so. | |
571 | */ | |
572 | static void drbd_setbufsize(struct socket *sock, unsigned int snd, | |
573 | unsigned int rcv) | |
574 | { | |
575 | /* open coded SO_SNDBUF, SO_RCVBUF */ | |
576 | if (snd) { | |
577 | sock->sk->sk_sndbuf = snd; | |
578 | sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; | |
579 | } | |
580 | if (rcv) { | |
581 | sock->sk->sk_rcvbuf = rcv; | |
582 | sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; | |
583 | } | |
584 | } | |
585 | ||
eac3e990 | 586 | static struct socket *drbd_try_connect(struct drbd_tconn *tconn) |
b411b363 PR |
587 | { |
588 | const char *what; | |
589 | struct socket *sock; | |
590 | struct sockaddr_in6 src_in6; | |
44ed167d PR |
591 | struct sockaddr_in6 peer_in6; |
592 | struct net_conf *nc; | |
593 | int err, peer_addr_len, my_addr_len; | |
69ef82de | 594 | int sndbuf_size, rcvbuf_size, connect_int; |
b411b363 PR |
595 | int disconnect_on_error = 1; |
596 | ||
44ed167d PR |
597 | rcu_read_lock(); |
598 | nc = rcu_dereference(tconn->net_conf); | |
599 | if (!nc) { | |
600 | rcu_read_unlock(); | |
b411b363 | 601 | return NULL; |
44ed167d | 602 | } |
44ed167d PR |
603 | sndbuf_size = nc->sndbuf_size; |
604 | rcvbuf_size = nc->rcvbuf_size; | |
69ef82de | 605 | connect_int = nc->connect_int; |
089c075d | 606 | rcu_read_unlock(); |
44ed167d | 607 | |
089c075d AG |
608 | my_addr_len = min_t(int, tconn->my_addr_len, sizeof(src_in6)); |
609 | memcpy(&src_in6, &tconn->my_addr, my_addr_len); | |
44ed167d | 610 | |
089c075d | 611 | if (((struct sockaddr *)&tconn->my_addr)->sa_family == AF_INET6) |
44ed167d PR |
612 | src_in6.sin6_port = 0; |
613 | else | |
614 | ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ | |
615 | ||
089c075d AG |
616 | peer_addr_len = min_t(int, tconn->peer_addr_len, sizeof(src_in6)); |
617 | memcpy(&peer_in6, &tconn->peer_addr, peer_addr_len); | |
b411b363 PR |
618 | |
619 | what = "sock_create_kern"; | |
44ed167d PR |
620 | err = sock_create_kern(((struct sockaddr *)&src_in6)->sa_family, |
621 | SOCK_STREAM, IPPROTO_TCP, &sock); | |
b411b363 PR |
622 | if (err < 0) { |
623 | sock = NULL; | |
624 | goto out; | |
625 | } | |
626 | ||
627 | sock->sk->sk_rcvtimeo = | |
69ef82de | 628 | sock->sk->sk_sndtimeo = connect_int * HZ; |
44ed167d | 629 | drbd_setbufsize(sock, sndbuf_size, rcvbuf_size); |
b411b363 PR |
630 | |
631 | /* explicitly bind to the configured IP as source IP | |
632 | * for the outgoing connections. | |
633 | * This is needed for multihomed hosts and to be | |
634 | * able to use lo: interfaces for drbd. | |
635 | * Make sure to use 0 as port number, so linux selects | |
636 | * a free one dynamically. | |
637 | */ | |
b411b363 | 638 | what = "bind before connect"; |
44ed167d | 639 | err = sock->ops->bind(sock, (struct sockaddr *) &src_in6, my_addr_len); |
b411b363 PR |
640 | if (err < 0) |
641 | goto out; | |
642 | ||
643 | /* connect may fail, peer not yet available. | |
644 | * stay C_WF_CONNECTION, don't go Disconnecting! */ | |
645 | disconnect_on_error = 0; | |
646 | what = "connect"; | |
44ed167d | 647 | err = sock->ops->connect(sock, (struct sockaddr *) &peer_in6, peer_addr_len, 0); |
b411b363 PR |
648 | |
649 | out: | |
650 | if (err < 0) { | |
651 | if (sock) { | |
652 | sock_release(sock); | |
653 | sock = NULL; | |
654 | } | |
655 | switch (-err) { | |
656 | /* timeout, busy, signal pending */ | |
657 | case ETIMEDOUT: case EAGAIN: case EINPROGRESS: | |
658 | case EINTR: case ERESTARTSYS: | |
659 | /* peer not (yet) available, network problem */ | |
660 | case ECONNREFUSED: case ENETUNREACH: | |
661 | case EHOSTDOWN: case EHOSTUNREACH: | |
662 | disconnect_on_error = 0; | |
663 | break; | |
664 | default: | |
eac3e990 | 665 | conn_err(tconn, "%s failed, err = %d\n", what, err); |
b411b363 PR |
666 | } |
667 | if (disconnect_on_error) | |
bbeb641c | 668 | conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 | 669 | } |
44ed167d | 670 | |
b411b363 PR |
671 | return sock; |
672 | } | |
673 | ||
7a426fd8 PR |
674 | struct accept_wait_data { |
675 | struct drbd_tconn *tconn; | |
676 | struct socket *s_listen; | |
677 | struct completion door_bell; | |
678 | void (*original_sk_state_change)(struct sock *sk); | |
679 | ||
680 | }; | |
681 | ||
682 | static void incomming_connection(struct sock *sk) | |
683 | { | |
684 | struct accept_wait_data *ad = sk->sk_user_data; | |
685 | struct drbd_tconn *tconn = ad->tconn; | |
686 | ||
687 | if (sk->sk_state != TCP_ESTABLISHED) | |
688 | conn_warn(tconn, "unexpected tcp state change. sk_state = %d\n", sk->sk_state); | |
689 | ||
690 | write_lock_bh(&sk->sk_callback_lock); | |
691 | sk->sk_state_change = ad->original_sk_state_change; | |
692 | sk->sk_user_data = NULL; | |
693 | write_unlock_bh(&sk->sk_callback_lock); | |
694 | ||
695 | sk->sk_state_change(sk); | |
696 | complete(&ad->door_bell); | |
697 | } | |
698 | ||
699 | static int prepare_listen_socket(struct drbd_tconn *tconn, struct accept_wait_data *ad) | |
b411b363 | 700 | { |
1f3e509b | 701 | int err, sndbuf_size, rcvbuf_size, my_addr_len; |
44ed167d | 702 | struct sockaddr_in6 my_addr; |
1f3e509b | 703 | struct socket *s_listen; |
44ed167d | 704 | struct net_conf *nc; |
b411b363 PR |
705 | const char *what; |
706 | ||
44ed167d PR |
707 | rcu_read_lock(); |
708 | nc = rcu_dereference(tconn->net_conf); | |
709 | if (!nc) { | |
710 | rcu_read_unlock(); | |
7a426fd8 | 711 | return -EIO; |
44ed167d | 712 | } |
44ed167d PR |
713 | sndbuf_size = nc->sndbuf_size; |
714 | rcvbuf_size = nc->rcvbuf_size; | |
44ed167d | 715 | rcu_read_unlock(); |
b411b363 | 716 | |
089c075d AG |
717 | my_addr_len = min_t(int, tconn->my_addr_len, sizeof(struct sockaddr_in6)); |
718 | memcpy(&my_addr, &tconn->my_addr, my_addr_len); | |
719 | ||
b411b363 | 720 | what = "sock_create_kern"; |
44ed167d | 721 | err = sock_create_kern(((struct sockaddr *)&my_addr)->sa_family, |
1f3e509b | 722 | SOCK_STREAM, IPPROTO_TCP, &s_listen); |
b411b363 PR |
723 | if (err) { |
724 | s_listen = NULL; | |
725 | goto out; | |
726 | } | |
727 | ||
1f3e509b | 728 | s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */ |
44ed167d | 729 | drbd_setbufsize(s_listen, sndbuf_size, rcvbuf_size); |
b411b363 PR |
730 | |
731 | what = "bind before listen"; | |
44ed167d | 732 | err = s_listen->ops->bind(s_listen, (struct sockaddr *)&my_addr, my_addr_len); |
b411b363 PR |
733 | if (err < 0) |
734 | goto out; | |
735 | ||
7a426fd8 PR |
736 | ad->s_listen = s_listen; |
737 | write_lock_bh(&s_listen->sk->sk_callback_lock); | |
738 | ad->original_sk_state_change = s_listen->sk->sk_state_change; | |
739 | s_listen->sk->sk_state_change = incomming_connection; | |
740 | s_listen->sk->sk_user_data = ad; | |
741 | write_unlock_bh(&s_listen->sk->sk_callback_lock); | |
742 | ||
2820fd39 PR |
743 | what = "listen"; |
744 | err = s_listen->ops->listen(s_listen, 5); | |
745 | if (err < 0) | |
746 | goto out; | |
747 | ||
7a426fd8 | 748 | return 0; |
1f3e509b PR |
749 | out: |
750 | if (s_listen) | |
751 | sock_release(s_listen); | |
752 | if (err < 0) { | |
753 | if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { | |
754 | conn_err(tconn, "%s failed, err = %d\n", what, err); | |
755 | conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); | |
756 | } | |
757 | } | |
758 | ||
7a426fd8 | 759 | return -EIO; |
1f3e509b PR |
760 | } |
761 | ||
7a426fd8 | 762 | static struct socket *drbd_wait_for_connect(struct drbd_tconn *tconn, struct accept_wait_data *ad) |
1f3e509b PR |
763 | { |
764 | int timeo, connect_int, err = 0; | |
765 | struct socket *s_estab = NULL; | |
1f3e509b PR |
766 | struct net_conf *nc; |
767 | ||
768 | rcu_read_lock(); | |
769 | nc = rcu_dereference(tconn->net_conf); | |
770 | if (!nc) { | |
771 | rcu_read_unlock(); | |
772 | return NULL; | |
773 | } | |
774 | connect_int = nc->connect_int; | |
775 | rcu_read_unlock(); | |
776 | ||
777 | timeo = connect_int * HZ; | |
778 | timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */ | |
779 | ||
7a426fd8 PR |
780 | err = wait_for_completion_interruptible_timeout(&ad->door_bell, timeo); |
781 | if (err <= 0) | |
782 | return NULL; | |
b411b363 | 783 | |
7a426fd8 | 784 | err = kernel_accept(ad->s_listen, &s_estab, 0); |
b411b363 PR |
785 | if (err < 0) { |
786 | if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { | |
1f3e509b | 787 | conn_err(tconn, "accept failed, err = %d\n", err); |
bbeb641c | 788 | conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 PR |
789 | } |
790 | } | |
b411b363 PR |
791 | |
792 | return s_estab; | |
793 | } | |
794 | ||
e658983a | 795 | static int decode_header(struct drbd_tconn *, void *, struct packet_info *); |
b411b363 | 796 | |
9f5bdc33 AG |
797 | static int send_first_packet(struct drbd_tconn *tconn, struct drbd_socket *sock, |
798 | enum drbd_packet cmd) | |
799 | { | |
800 | if (!conn_prepare_command(tconn, sock)) | |
801 | return -EIO; | |
e658983a | 802 | return conn_send_command(tconn, sock, cmd, 0, NULL, 0); |
b411b363 PR |
803 | } |
804 | ||
9f5bdc33 | 805 | static int receive_first_packet(struct drbd_tconn *tconn, struct socket *sock) |
b411b363 | 806 | { |
9f5bdc33 AG |
807 | unsigned int header_size = drbd_header_size(tconn); |
808 | struct packet_info pi; | |
809 | int err; | |
b411b363 | 810 | |
9f5bdc33 AG |
811 | err = drbd_recv_short(sock, tconn->data.rbuf, header_size, 0); |
812 | if (err != header_size) { | |
813 | if (err >= 0) | |
814 | err = -EIO; | |
815 | return err; | |
816 | } | |
817 | err = decode_header(tconn, tconn->data.rbuf, &pi); | |
818 | if (err) | |
819 | return err; | |
820 | return pi.cmd; | |
b411b363 PR |
821 | } |
822 | ||
823 | /** | |
824 | * drbd_socket_okay() - Free the socket if its connection is not okay | |
b411b363 PR |
825 | * @sock: pointer to the pointer to the socket. |
826 | */ | |
dbd9eea0 | 827 | static int drbd_socket_okay(struct socket **sock) |
b411b363 PR |
828 | { |
829 | int rr; | |
830 | char tb[4]; | |
831 | ||
832 | if (!*sock) | |
81e84650 | 833 | return false; |
b411b363 | 834 | |
dbd9eea0 | 835 | rr = drbd_recv_short(*sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); |
b411b363 PR |
836 | |
837 | if (rr > 0 || rr == -EAGAIN) { | |
81e84650 | 838 | return true; |
b411b363 PR |
839 | } else { |
840 | sock_release(*sock); | |
841 | *sock = NULL; | |
81e84650 | 842 | return false; |
b411b363 PR |
843 | } |
844 | } | |
2325eb66 PR |
845 | /* Gets called if a connection is established, or if a new minor gets created |
846 | in a connection */ | |
c141ebda | 847 | int drbd_connected(struct drbd_conf *mdev) |
907599e0 | 848 | { |
0829f5ed | 849 | int err; |
907599e0 PR |
850 | |
851 | atomic_set(&mdev->packet_seq, 0); | |
852 | mdev->peer_seq = 0; | |
853 | ||
8410da8f PR |
854 | mdev->state_mutex = mdev->tconn->agreed_pro_version < 100 ? |
855 | &mdev->tconn->cstate_mutex : | |
856 | &mdev->own_state_mutex; | |
857 | ||
0829f5ed AG |
858 | err = drbd_send_sync_param(mdev); |
859 | if (!err) | |
860 | err = drbd_send_sizes(mdev, 0, 0); | |
861 | if (!err) | |
862 | err = drbd_send_uuids(mdev); | |
863 | if (!err) | |
43de7c85 | 864 | err = drbd_send_current_state(mdev); |
907599e0 PR |
865 | clear_bit(USE_DEGR_WFC_T, &mdev->flags); |
866 | clear_bit(RESIZE_PENDING, &mdev->flags); | |
8b924f1d | 867 | mod_timer(&mdev->request_timer, jiffies + HZ); /* just start it here. */ |
0829f5ed | 868 | return err; |
907599e0 PR |
869 | } |
870 | ||
b411b363 PR |
871 | /* |
872 | * return values: | |
873 | * 1 yes, we have a valid connection | |
874 | * 0 oops, did not work out, please try again | |
875 | * -1 peer talks different language, | |
876 | * no point in trying again, please go standalone. | |
877 | * -2 We do not have a network config... | |
878 | */ | |
81fa2e67 | 879 | static int conn_connect(struct drbd_tconn *tconn) |
b411b363 | 880 | { |
7da35862 | 881 | struct drbd_socket sock, msock; |
c141ebda | 882 | struct drbd_conf *mdev; |
44ed167d | 883 | struct net_conf *nc; |
c141ebda | 884 | int vnr, timeout, try, h, ok; |
08b165ba | 885 | bool discard_my_data; |
a1096a6e | 886 | enum drbd_state_rv rv; |
7a426fd8 PR |
887 | struct accept_wait_data ad = { |
888 | .tconn = tconn, | |
889 | .door_bell = COMPLETION_INITIALIZER_ONSTACK(ad.door_bell), | |
890 | }; | |
b411b363 | 891 | |
bbeb641c | 892 | if (conn_request_state(tconn, NS(conn, C_WF_CONNECTION), CS_VERBOSE) < SS_SUCCESS) |
b411b363 PR |
893 | return -2; |
894 | ||
7da35862 PR |
895 | mutex_init(&sock.mutex); |
896 | sock.sbuf = tconn->data.sbuf; | |
897 | sock.rbuf = tconn->data.rbuf; | |
898 | sock.socket = NULL; | |
899 | mutex_init(&msock.mutex); | |
900 | msock.sbuf = tconn->meta.sbuf; | |
901 | msock.rbuf = tconn->meta.rbuf; | |
902 | msock.socket = NULL; | |
903 | ||
907599e0 | 904 | clear_bit(DISCARD_CONCURRENT, &tconn->flags); |
0916e0e3 AG |
905 | |
906 | /* Assume that the peer only understands protocol 80 until we know better. */ | |
907 | tconn->agreed_pro_version = 80; | |
b411b363 | 908 | |
7a426fd8 PR |
909 | if (prepare_listen_socket(tconn, &ad)) |
910 | return 0; | |
911 | ||
b411b363 | 912 | do { |
2bf89621 AG |
913 | struct socket *s; |
914 | ||
b411b363 PR |
915 | for (try = 0;;) { |
916 | /* 3 tries, this should take less than a second! */ | |
907599e0 | 917 | s = drbd_try_connect(tconn); |
b411b363 PR |
918 | if (s || ++try >= 3) |
919 | break; | |
920 | /* give the other side time to call bind() & listen() */ | |
20ee6390 | 921 | schedule_timeout_interruptible(HZ / 10); |
b411b363 PR |
922 | } |
923 | ||
924 | if (s) { | |
7da35862 PR |
925 | if (!sock.socket) { |
926 | sock.socket = s; | |
927 | send_first_packet(tconn, &sock, P_INITIAL_DATA); | |
928 | } else if (!msock.socket) { | |
929 | msock.socket = s; | |
930 | send_first_packet(tconn, &msock, P_INITIAL_META); | |
b411b363 | 931 | } else { |
81fa2e67 | 932 | conn_err(tconn, "Logic error in conn_connect()\n"); |
b411b363 PR |
933 | goto out_release_sockets; |
934 | } | |
935 | } | |
936 | ||
7da35862 PR |
937 | if (sock.socket && msock.socket) { |
938 | rcu_read_lock(); | |
939 | nc = rcu_dereference(tconn->net_conf); | |
940 | timeout = nc->ping_timeo * HZ / 10; | |
941 | rcu_read_unlock(); | |
942 | schedule_timeout_interruptible(timeout); | |
943 | ok = drbd_socket_okay(&sock.socket); | |
944 | ok = drbd_socket_okay(&msock.socket) && ok; | |
b411b363 PR |
945 | if (ok) |
946 | break; | |
947 | } | |
948 | ||
949 | retry: | |
7a426fd8 | 950 | s = drbd_wait_for_connect(tconn, &ad); |
b411b363 | 951 | if (s) { |
9f5bdc33 | 952 | try = receive_first_packet(tconn, s); |
7da35862 PR |
953 | drbd_socket_okay(&sock.socket); |
954 | drbd_socket_okay(&msock.socket); | |
b411b363 | 955 | switch (try) { |
e5d6f33a | 956 | case P_INITIAL_DATA: |
7da35862 | 957 | if (sock.socket) { |
907599e0 | 958 | conn_warn(tconn, "initial packet S crossed\n"); |
7da35862 | 959 | sock_release(sock.socket); |
b411b363 | 960 | } |
7da35862 | 961 | sock.socket = s; |
b411b363 | 962 | break; |
e5d6f33a | 963 | case P_INITIAL_META: |
7da35862 | 964 | if (msock.socket) { |
907599e0 | 965 | conn_warn(tconn, "initial packet M crossed\n"); |
7da35862 | 966 | sock_release(msock.socket); |
b411b363 | 967 | } |
7da35862 | 968 | msock.socket = s; |
907599e0 | 969 | set_bit(DISCARD_CONCURRENT, &tconn->flags); |
b411b363 PR |
970 | break; |
971 | default: | |
907599e0 | 972 | conn_warn(tconn, "Error receiving initial packet\n"); |
b411b363 PR |
973 | sock_release(s); |
974 | if (random32() & 1) | |
975 | goto retry; | |
976 | } | |
977 | } | |
978 | ||
bbeb641c | 979 | if (tconn->cstate <= C_DISCONNECTING) |
b411b363 PR |
980 | goto out_release_sockets; |
981 | if (signal_pending(current)) { | |
982 | flush_signals(current); | |
983 | smp_rmb(); | |
907599e0 | 984 | if (get_t_state(&tconn->receiver) == EXITING) |
b411b363 PR |
985 | goto out_release_sockets; |
986 | } | |
987 | ||
b666dbf8 PR |
988 | ok = drbd_socket_okay(&sock.socket); |
989 | ok = drbd_socket_okay(&msock.socket) && ok; | |
990 | } while (!ok); | |
b411b363 | 991 | |
7a426fd8 PR |
992 | if (ad.s_listen) |
993 | sock_release(ad.s_listen); | |
994 | ||
7da35862 PR |
995 | sock.socket->sk->sk_reuse = 1; /* SO_REUSEADDR */ |
996 | msock.socket->sk->sk_reuse = 1; /* SO_REUSEADDR */ | |
b411b363 | 997 | |
7da35862 PR |
998 | sock.socket->sk->sk_allocation = GFP_NOIO; |
999 | msock.socket->sk->sk_allocation = GFP_NOIO; | |
b411b363 | 1000 | |
7da35862 PR |
1001 | sock.socket->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; |
1002 | msock.socket->sk->sk_priority = TC_PRIO_INTERACTIVE; | |
b411b363 | 1003 | |
b411b363 | 1004 | /* NOT YET ... |
7da35862 PR |
1005 | * sock.socket->sk->sk_sndtimeo = tconn->net_conf->timeout*HZ/10; |
1006 | * sock.socket->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
6038178e | 1007 | * first set it to the P_CONNECTION_FEATURES timeout, |
b411b363 | 1008 | * which we set to 4x the configured ping_timeout. */ |
44ed167d PR |
1009 | rcu_read_lock(); |
1010 | nc = rcu_dereference(tconn->net_conf); | |
1011 | ||
7da35862 PR |
1012 | sock.socket->sk->sk_sndtimeo = |
1013 | sock.socket->sk->sk_rcvtimeo = nc->ping_timeo*4*HZ/10; | |
44ed167d | 1014 | |
7da35862 | 1015 | msock.socket->sk->sk_rcvtimeo = nc->ping_int*HZ; |
44ed167d | 1016 | timeout = nc->timeout * HZ / 10; |
08b165ba | 1017 | discard_my_data = nc->discard_my_data; |
44ed167d | 1018 | rcu_read_unlock(); |
b411b363 | 1019 | |
7da35862 | 1020 | msock.socket->sk->sk_sndtimeo = timeout; |
b411b363 PR |
1021 | |
1022 | /* we don't want delays. | |
25985edc | 1023 | * we use TCP_CORK where appropriate, though */ |
7da35862 PR |
1024 | drbd_tcp_nodelay(sock.socket); |
1025 | drbd_tcp_nodelay(msock.socket); | |
b411b363 | 1026 | |
7da35862 PR |
1027 | tconn->data.socket = sock.socket; |
1028 | tconn->meta.socket = msock.socket; | |
907599e0 | 1029 | tconn->last_received = jiffies; |
b411b363 | 1030 | |
6038178e | 1031 | h = drbd_do_features(tconn); |
b411b363 PR |
1032 | if (h <= 0) |
1033 | return h; | |
1034 | ||
907599e0 | 1035 | if (tconn->cram_hmac_tfm) { |
b411b363 | 1036 | /* drbd_request_state(mdev, NS(conn, WFAuth)); */ |
907599e0 | 1037 | switch (drbd_do_auth(tconn)) { |
b10d96cb | 1038 | case -1: |
907599e0 | 1039 | conn_err(tconn, "Authentication of peer failed\n"); |
b411b363 | 1040 | return -1; |
b10d96cb | 1041 | case 0: |
907599e0 | 1042 | conn_err(tconn, "Authentication of peer failed, trying again.\n"); |
b10d96cb | 1043 | return 0; |
b411b363 PR |
1044 | } |
1045 | } | |
1046 | ||
7da35862 PR |
1047 | tconn->data.socket->sk->sk_sndtimeo = timeout; |
1048 | tconn->data.socket->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
b411b363 | 1049 | |
387eb308 | 1050 | if (drbd_send_protocol(tconn) == -EOPNOTSUPP) |
7e2455c1 | 1051 | return -1; |
b411b363 | 1052 | |
a1096a6e PR |
1053 | set_bit(STATE_SENT, &tconn->flags); |
1054 | ||
c141ebda PR |
1055 | rcu_read_lock(); |
1056 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { | |
1057 | kref_get(&mdev->kref); | |
1058 | rcu_read_unlock(); | |
08b165ba PR |
1059 | |
1060 | if (discard_my_data) | |
1061 | set_bit(DISCARD_MY_DATA, &mdev->flags); | |
1062 | else | |
1063 | clear_bit(DISCARD_MY_DATA, &mdev->flags); | |
1064 | ||
c141ebda PR |
1065 | drbd_connected(mdev); |
1066 | kref_put(&mdev->kref, &drbd_minor_destroy); | |
1067 | rcu_read_lock(); | |
1068 | } | |
1069 | rcu_read_unlock(); | |
1070 | ||
a1096a6e PR |
1071 | rv = conn_request_state(tconn, NS(conn, C_WF_REPORT_PARAMS), CS_VERBOSE); |
1072 | if (rv < SS_SUCCESS) { | |
1073 | clear_bit(STATE_SENT, &tconn->flags); | |
823bd832 | 1074 | return 0; |
a1096a6e | 1075 | } |
823bd832 PR |
1076 | |
1077 | drbd_thread_start(&tconn->asender); | |
1078 | ||
08b165ba PR |
1079 | mutex_lock(&tconn->conf_update); |
1080 | /* The discard_my_data flag is a single-shot modifier to the next | |
1081 | * connection attempt, the handshake of which is now well underway. | |
1082 | * No need for rcu style copying of the whole struct | |
1083 | * just to clear a single value. */ | |
1084 | tconn->net_conf->discard_my_data = 0; | |
1085 | mutex_unlock(&tconn->conf_update); | |
1086 | ||
d3fcb490 | 1087 | return h; |
b411b363 PR |
1088 | |
1089 | out_release_sockets: | |
7a426fd8 PR |
1090 | if (ad.s_listen) |
1091 | sock_release(ad.s_listen); | |
7da35862 PR |
1092 | if (sock.socket) |
1093 | sock_release(sock.socket); | |
1094 | if (msock.socket) | |
1095 | sock_release(msock.socket); | |
b411b363 PR |
1096 | return -1; |
1097 | } | |
1098 | ||
e658983a | 1099 | static int decode_header(struct drbd_tconn *tconn, void *header, struct packet_info *pi) |
b411b363 | 1100 | { |
e658983a AG |
1101 | unsigned int header_size = drbd_header_size(tconn); |
1102 | ||
0c8e36d9 AG |
1103 | if (header_size == sizeof(struct p_header100) && |
1104 | *(__be32 *)header == cpu_to_be32(DRBD_MAGIC_100)) { | |
1105 | struct p_header100 *h = header; | |
1106 | if (h->pad != 0) { | |
1107 | conn_err(tconn, "Header padding is not zero\n"); | |
1108 | return -EINVAL; | |
1109 | } | |
1110 | pi->vnr = be16_to_cpu(h->volume); | |
1111 | pi->cmd = be16_to_cpu(h->command); | |
1112 | pi->size = be32_to_cpu(h->length); | |
1113 | } else if (header_size == sizeof(struct p_header95) && | |
1114 | *(__be16 *)header == cpu_to_be16(DRBD_MAGIC_BIG)) { | |
e658983a | 1115 | struct p_header95 *h = header; |
e658983a | 1116 | pi->cmd = be16_to_cpu(h->command); |
b55d84ba AG |
1117 | pi->size = be32_to_cpu(h->length); |
1118 | pi->vnr = 0; | |
e658983a AG |
1119 | } else if (header_size == sizeof(struct p_header80) && |
1120 | *(__be32 *)header == cpu_to_be32(DRBD_MAGIC)) { | |
1121 | struct p_header80 *h = header; | |
1122 | pi->cmd = be16_to_cpu(h->command); | |
1123 | pi->size = be16_to_cpu(h->length); | |
77351055 | 1124 | pi->vnr = 0; |
02918be2 | 1125 | } else { |
e658983a AG |
1126 | conn_err(tconn, "Wrong magic value 0x%08x in protocol version %d\n", |
1127 | be32_to_cpu(*(__be32 *)header), | |
1128 | tconn->agreed_pro_version); | |
8172f3e9 | 1129 | return -EINVAL; |
b411b363 | 1130 | } |
e658983a | 1131 | pi->data = header + header_size; |
8172f3e9 | 1132 | return 0; |
257d0af6 PR |
1133 | } |
1134 | ||
9ba7aa00 | 1135 | static int drbd_recv_header(struct drbd_tconn *tconn, struct packet_info *pi) |
257d0af6 | 1136 | { |
e658983a | 1137 | void *buffer = tconn->data.rbuf; |
69bc7bc3 | 1138 | int err; |
257d0af6 | 1139 | |
e658983a | 1140 | err = drbd_recv_all_warn(tconn, buffer, drbd_header_size(tconn)); |
a5c31904 | 1141 | if (err) |
69bc7bc3 | 1142 | return err; |
257d0af6 | 1143 | |
e658983a | 1144 | err = decode_header(tconn, buffer, pi); |
9ba7aa00 | 1145 | tconn->last_received = jiffies; |
b411b363 | 1146 | |
69bc7bc3 | 1147 | return err; |
b411b363 PR |
1148 | } |
1149 | ||
4b0007c0 | 1150 | static void drbd_flush(struct drbd_tconn *tconn) |
b411b363 PR |
1151 | { |
1152 | int rv; | |
4b0007c0 PR |
1153 | struct drbd_conf *mdev; |
1154 | int vnr; | |
1155 | ||
1156 | if (tconn->write_ordering >= WO_bdev_flush) { | |
615e087f | 1157 | rcu_read_lock(); |
4b0007c0 | 1158 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { |
615e087f LE |
1159 | if (!get_ldev(mdev)) |
1160 | continue; | |
1161 | kref_get(&mdev->kref); | |
1162 | rcu_read_unlock(); | |
1163 | ||
1164 | rv = blkdev_issue_flush(mdev->ldev->backing_bdev, | |
1165 | GFP_NOIO, NULL); | |
1166 | if (rv) { | |
1167 | dev_info(DEV, "local disk flush failed with status %d\n", rv); | |
1168 | /* would rather check on EOPNOTSUPP, but that is not reliable. | |
1169 | * don't try again for ANY return value != 0 | |
1170 | * if (rv == -EOPNOTSUPP) */ | |
1171 | drbd_bump_write_ordering(tconn, WO_drain_io); | |
4b0007c0 | 1172 | } |
615e087f LE |
1173 | put_ldev(mdev); |
1174 | kref_put(&mdev->kref, &drbd_minor_destroy); | |
1175 | ||
1176 | rcu_read_lock(); | |
1177 | if (rv) | |
1178 | break; | |
b411b363 | 1179 | } |
615e087f | 1180 | rcu_read_unlock(); |
b411b363 | 1181 | } |
b411b363 PR |
1182 | } |
1183 | ||
1184 | /** | |
1185 | * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. | |
1186 | * @mdev: DRBD device. | |
1187 | * @epoch: Epoch object. | |
1188 | * @ev: Epoch event. | |
1189 | */ | |
1e9dd291 | 1190 | static enum finish_epoch drbd_may_finish_epoch(struct drbd_tconn *tconn, |
b411b363 PR |
1191 | struct drbd_epoch *epoch, |
1192 | enum epoch_event ev) | |
1193 | { | |
2451fc3b | 1194 | int epoch_size; |
b411b363 | 1195 | struct drbd_epoch *next_epoch; |
b411b363 PR |
1196 | enum finish_epoch rv = FE_STILL_LIVE; |
1197 | ||
12038a3a | 1198 | spin_lock(&tconn->epoch_lock); |
b411b363 PR |
1199 | do { |
1200 | next_epoch = NULL; | |
b411b363 PR |
1201 | |
1202 | epoch_size = atomic_read(&epoch->epoch_size); | |
1203 | ||
1204 | switch (ev & ~EV_CLEANUP) { | |
1205 | case EV_PUT: | |
1206 | atomic_dec(&epoch->active); | |
1207 | break; | |
1208 | case EV_GOT_BARRIER_NR: | |
1209 | set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); | |
b411b363 PR |
1210 | break; |
1211 | case EV_BECAME_LAST: | |
1212 | /* nothing to do*/ | |
1213 | break; | |
1214 | } | |
1215 | ||
b411b363 PR |
1216 | if (epoch_size != 0 && |
1217 | atomic_read(&epoch->active) == 0 && | |
85d73513 | 1218 | (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags) || ev & EV_CLEANUP)) { |
b411b363 | 1219 | if (!(ev & EV_CLEANUP)) { |
12038a3a | 1220 | spin_unlock(&tconn->epoch_lock); |
9ed57dcb | 1221 | drbd_send_b_ack(epoch->tconn, epoch->barrier_nr, epoch_size); |
12038a3a | 1222 | spin_lock(&tconn->epoch_lock); |
b411b363 | 1223 | } |
9ed57dcb LE |
1224 | #if 0 |
1225 | /* FIXME: dec unacked on connection, once we have | |
1226 | * something to count pending connection packets in. */ | |
85d73513 | 1227 | if (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) |
9ed57dcb LE |
1228 | dec_unacked(epoch->tconn); |
1229 | #endif | |
b411b363 | 1230 | |
12038a3a | 1231 | if (tconn->current_epoch != epoch) { |
b411b363 PR |
1232 | next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); |
1233 | list_del(&epoch->list); | |
1234 | ev = EV_BECAME_LAST | (ev & EV_CLEANUP); | |
12038a3a | 1235 | tconn->epochs--; |
b411b363 PR |
1236 | kfree(epoch); |
1237 | ||
1238 | if (rv == FE_STILL_LIVE) | |
1239 | rv = FE_DESTROYED; | |
1240 | } else { | |
1241 | epoch->flags = 0; | |
1242 | atomic_set(&epoch->epoch_size, 0); | |
698f9315 | 1243 | /* atomic_set(&epoch->active, 0); is already zero */ |
b411b363 PR |
1244 | if (rv == FE_STILL_LIVE) |
1245 | rv = FE_RECYCLED; | |
1246 | } | |
1247 | } | |
1248 | ||
1249 | if (!next_epoch) | |
1250 | break; | |
1251 | ||
1252 | epoch = next_epoch; | |
1253 | } while (1); | |
1254 | ||
12038a3a | 1255 | spin_unlock(&tconn->epoch_lock); |
b411b363 | 1256 | |
b411b363 PR |
1257 | return rv; |
1258 | } | |
1259 | ||
1260 | /** | |
1261 | * drbd_bump_write_ordering() - Fall back to an other write ordering method | |
4b0007c0 | 1262 | * @tconn: DRBD connection. |
b411b363 PR |
1263 | * @wo: Write ordering method to try. |
1264 | */ | |
4b0007c0 | 1265 | void drbd_bump_write_ordering(struct drbd_tconn *tconn, enum write_ordering_e wo) |
b411b363 | 1266 | { |
daeda1cc | 1267 | struct disk_conf *dc; |
4b0007c0 | 1268 | struct drbd_conf *mdev; |
b411b363 | 1269 | enum write_ordering_e pwo; |
4b0007c0 | 1270 | int vnr; |
b411b363 PR |
1271 | static char *write_ordering_str[] = { |
1272 | [WO_none] = "none", | |
1273 | [WO_drain_io] = "drain", | |
1274 | [WO_bdev_flush] = "flush", | |
b411b363 PR |
1275 | }; |
1276 | ||
4b0007c0 | 1277 | pwo = tconn->write_ordering; |
b411b363 | 1278 | wo = min(pwo, wo); |
daeda1cc | 1279 | rcu_read_lock(); |
4b0007c0 | 1280 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { |
27eb13e9 | 1281 | if (!get_ldev_if_state(mdev, D_ATTACHING)) |
4b0007c0 PR |
1282 | continue; |
1283 | dc = rcu_dereference(mdev->ldev->disk_conf); | |
1284 | ||
1285 | if (wo == WO_bdev_flush && !dc->disk_flushes) | |
1286 | wo = WO_drain_io; | |
1287 | if (wo == WO_drain_io && !dc->disk_drain) | |
1288 | wo = WO_none; | |
1289 | put_ldev(mdev); | |
1290 | } | |
daeda1cc | 1291 | rcu_read_unlock(); |
4b0007c0 PR |
1292 | tconn->write_ordering = wo; |
1293 | if (pwo != tconn->write_ordering || wo == WO_bdev_flush) | |
1294 | conn_info(tconn, "Method to ensure write ordering: %s\n", write_ordering_str[tconn->write_ordering]); | |
b411b363 PR |
1295 | } |
1296 | ||
45bb912b | 1297 | /** |
fbe29dec | 1298 | * drbd_submit_peer_request() |
45bb912b | 1299 | * @mdev: DRBD device. |
db830c46 | 1300 | * @peer_req: peer request |
45bb912b | 1301 | * @rw: flag field, see bio->bi_rw |
10f6d992 LE |
1302 | * |
1303 | * May spread the pages to multiple bios, | |
1304 | * depending on bio_add_page restrictions. | |
1305 | * | |
1306 | * Returns 0 if all bios have been submitted, | |
1307 | * -ENOMEM if we could not allocate enough bios, | |
1308 | * -ENOSPC (any better suggestion?) if we have not been able to bio_add_page a | |
1309 | * single page to an empty bio (which should never happen and likely indicates | |
1310 | * that the lower level IO stack is in some way broken). This has been observed | |
1311 | * on certain Xen deployments. | |
45bb912b LE |
1312 | */ |
1313 | /* TODO allocate from our own bio_set. */ | |
fbe29dec AG |
1314 | int drbd_submit_peer_request(struct drbd_conf *mdev, |
1315 | struct drbd_peer_request *peer_req, | |
1316 | const unsigned rw, const int fault_type) | |
45bb912b LE |
1317 | { |
1318 | struct bio *bios = NULL; | |
1319 | struct bio *bio; | |
db830c46 AG |
1320 | struct page *page = peer_req->pages; |
1321 | sector_t sector = peer_req->i.sector; | |
1322 | unsigned ds = peer_req->i.size; | |
45bb912b LE |
1323 | unsigned n_bios = 0; |
1324 | unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT; | |
10f6d992 | 1325 | int err = -ENOMEM; |
45bb912b LE |
1326 | |
1327 | /* In most cases, we will only need one bio. But in case the lower | |
1328 | * level restrictions happen to be different at this offset on this | |
1329 | * side than those of the sending peer, we may need to submit the | |
da4a75d2 LE |
1330 | * request in more than one bio. |
1331 | * | |
1332 | * Plain bio_alloc is good enough here, this is no DRBD internally | |
1333 | * generated bio, but a bio allocated on behalf of the peer. | |
1334 | */ | |
45bb912b LE |
1335 | next_bio: |
1336 | bio = bio_alloc(GFP_NOIO, nr_pages); | |
1337 | if (!bio) { | |
1338 | dev_err(DEV, "submit_ee: Allocation of a bio failed\n"); | |
1339 | goto fail; | |
1340 | } | |
db830c46 | 1341 | /* > peer_req->i.sector, unless this is the first bio */ |
45bb912b LE |
1342 | bio->bi_sector = sector; |
1343 | bio->bi_bdev = mdev->ldev->backing_bdev; | |
45bb912b | 1344 | bio->bi_rw = rw; |
db830c46 | 1345 | bio->bi_private = peer_req; |
fcefa62e | 1346 | bio->bi_end_io = drbd_peer_request_endio; |
45bb912b LE |
1347 | |
1348 | bio->bi_next = bios; | |
1349 | bios = bio; | |
1350 | ++n_bios; | |
1351 | ||
1352 | page_chain_for_each(page) { | |
1353 | unsigned len = min_t(unsigned, ds, PAGE_SIZE); | |
1354 | if (!bio_add_page(bio, page, len, 0)) { | |
10f6d992 LE |
1355 | /* A single page must always be possible! |
1356 | * But in case it fails anyways, | |
1357 | * we deal with it, and complain (below). */ | |
1358 | if (bio->bi_vcnt == 0) { | |
1359 | dev_err(DEV, | |
1360 | "bio_add_page failed for len=%u, " | |
1361 | "bi_vcnt=0 (bi_sector=%llu)\n", | |
1362 | len, (unsigned long long)bio->bi_sector); | |
1363 | err = -ENOSPC; | |
1364 | goto fail; | |
1365 | } | |
45bb912b LE |
1366 | goto next_bio; |
1367 | } | |
1368 | ds -= len; | |
1369 | sector += len >> 9; | |
1370 | --nr_pages; | |
1371 | } | |
1372 | D_ASSERT(page == NULL); | |
1373 | D_ASSERT(ds == 0); | |
1374 | ||
db830c46 | 1375 | atomic_set(&peer_req->pending_bios, n_bios); |
45bb912b LE |
1376 | do { |
1377 | bio = bios; | |
1378 | bios = bios->bi_next; | |
1379 | bio->bi_next = NULL; | |
1380 | ||
45bb912b | 1381 | drbd_generic_make_request(mdev, fault_type, bio); |
45bb912b | 1382 | } while (bios); |
45bb912b LE |
1383 | return 0; |
1384 | ||
1385 | fail: | |
1386 | while (bios) { | |
1387 | bio = bios; | |
1388 | bios = bios->bi_next; | |
1389 | bio_put(bio); | |
1390 | } | |
10f6d992 | 1391 | return err; |
45bb912b LE |
1392 | } |
1393 | ||
53840641 | 1394 | static void drbd_remove_epoch_entry_interval(struct drbd_conf *mdev, |
db830c46 | 1395 | struct drbd_peer_request *peer_req) |
53840641 | 1396 | { |
db830c46 | 1397 | struct drbd_interval *i = &peer_req->i; |
53840641 AG |
1398 | |
1399 | drbd_remove_interval(&mdev->write_requests, i); | |
1400 | drbd_clear_interval(i); | |
1401 | ||
6c852bec | 1402 | /* Wake up any processes waiting for this peer request to complete. */ |
53840641 AG |
1403 | if (i->waiting) |
1404 | wake_up(&mdev->misc_wait); | |
1405 | } | |
1406 | ||
77fede51 PR |
1407 | void conn_wait_active_ee_empty(struct drbd_tconn *tconn) |
1408 | { | |
1409 | struct drbd_conf *mdev; | |
1410 | int vnr; | |
1411 | ||
1412 | rcu_read_lock(); | |
1413 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { | |
1414 | kref_get(&mdev->kref); | |
1415 | rcu_read_unlock(); | |
1416 | drbd_wait_ee_list_empty(mdev, &mdev->active_ee); | |
1417 | kref_put(&mdev->kref, &drbd_minor_destroy); | |
1418 | rcu_read_lock(); | |
1419 | } | |
1420 | rcu_read_unlock(); | |
1421 | } | |
1422 | ||
4a76b161 | 1423 | static int receive_Barrier(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 1424 | { |
2451fc3b | 1425 | int rv; |
e658983a | 1426 | struct p_barrier *p = pi->data; |
b411b363 PR |
1427 | struct drbd_epoch *epoch; |
1428 | ||
9ed57dcb LE |
1429 | /* FIXME these are unacked on connection, |
1430 | * not a specific (peer)device. | |
1431 | */ | |
12038a3a | 1432 | tconn->current_epoch->barrier_nr = p->barrier; |
9ed57dcb | 1433 | tconn->current_epoch->tconn = tconn; |
1e9dd291 | 1434 | rv = drbd_may_finish_epoch(tconn, tconn->current_epoch, EV_GOT_BARRIER_NR); |
b411b363 PR |
1435 | |
1436 | /* P_BARRIER_ACK may imply that the corresponding extent is dropped from | |
1437 | * the activity log, which means it would not be resynced in case the | |
1438 | * R_PRIMARY crashes now. | |
1439 | * Therefore we must send the barrier_ack after the barrier request was | |
1440 | * completed. */ | |
4b0007c0 | 1441 | switch (tconn->write_ordering) { |
b411b363 PR |
1442 | case WO_none: |
1443 | if (rv == FE_RECYCLED) | |
82bc0194 | 1444 | return 0; |
2451fc3b PR |
1445 | |
1446 | /* receiver context, in the writeout path of the other node. | |
1447 | * avoid potential distributed deadlock */ | |
1448 | epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); | |
1449 | if (epoch) | |
1450 | break; | |
1451 | else | |
9ed57dcb | 1452 | conn_warn(tconn, "Allocation of an epoch failed, slowing down\n"); |
2451fc3b | 1453 | /* Fall through */ |
b411b363 PR |
1454 | |
1455 | case WO_bdev_flush: | |
1456 | case WO_drain_io: | |
77fede51 | 1457 | conn_wait_active_ee_empty(tconn); |
4b0007c0 | 1458 | drbd_flush(tconn); |
2451fc3b | 1459 | |
12038a3a | 1460 | if (atomic_read(&tconn->current_epoch->epoch_size)) { |
2451fc3b PR |
1461 | epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); |
1462 | if (epoch) | |
1463 | break; | |
b411b363 PR |
1464 | } |
1465 | ||
82bc0194 | 1466 | return 0; |
2451fc3b | 1467 | default: |
9ed57dcb | 1468 | conn_err(tconn, "Strangeness in tconn->write_ordering %d\n", tconn->write_ordering); |
82bc0194 | 1469 | return -EIO; |
b411b363 PR |
1470 | } |
1471 | ||
1472 | epoch->flags = 0; | |
1473 | atomic_set(&epoch->epoch_size, 0); | |
1474 | atomic_set(&epoch->active, 0); | |
1475 | ||
12038a3a PR |
1476 | spin_lock(&tconn->epoch_lock); |
1477 | if (atomic_read(&tconn->current_epoch->epoch_size)) { | |
1478 | list_add(&epoch->list, &tconn->current_epoch->list); | |
1479 | tconn->current_epoch = epoch; | |
1480 | tconn->epochs++; | |
b411b363 PR |
1481 | } else { |
1482 | /* The current_epoch got recycled while we allocated this one... */ | |
1483 | kfree(epoch); | |
1484 | } | |
12038a3a | 1485 | spin_unlock(&tconn->epoch_lock); |
b411b363 | 1486 | |
82bc0194 | 1487 | return 0; |
b411b363 PR |
1488 | } |
1489 | ||
1490 | /* used from receive_RSDataReply (recv_resync_read) | |
1491 | * and from receive_Data */ | |
f6ffca9f AG |
1492 | static struct drbd_peer_request * |
1493 | read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, | |
1494 | int data_size) __must_hold(local) | |
b411b363 | 1495 | { |
6666032a | 1496 | const sector_t capacity = drbd_get_capacity(mdev->this_bdev); |
db830c46 | 1497 | struct drbd_peer_request *peer_req; |
b411b363 | 1498 | struct page *page; |
a5c31904 | 1499 | int dgs, ds, err; |
a0638456 PR |
1500 | void *dig_in = mdev->tconn->int_dig_in; |
1501 | void *dig_vv = mdev->tconn->int_dig_vv; | |
6b4388ac | 1502 | unsigned long *data; |
b411b363 | 1503 | |
88104ca4 AG |
1504 | dgs = 0; |
1505 | if (mdev->tconn->peer_integrity_tfm) { | |
1506 | dgs = crypto_hash_digestsize(mdev->tconn->peer_integrity_tfm); | |
9f5bdc33 AG |
1507 | /* |
1508 | * FIXME: Receive the incoming digest into the receive buffer | |
1509 | * here, together with its struct p_data? | |
1510 | */ | |
a5c31904 AG |
1511 | err = drbd_recv_all_warn(mdev->tconn, dig_in, dgs); |
1512 | if (err) | |
b411b363 | 1513 | return NULL; |
88104ca4 | 1514 | data_size -= dgs; |
b411b363 PR |
1515 | } |
1516 | ||
841ce241 AG |
1517 | if (!expect(IS_ALIGNED(data_size, 512))) |
1518 | return NULL; | |
1519 | if (!expect(data_size <= DRBD_MAX_BIO_SIZE)) | |
1520 | return NULL; | |
b411b363 | 1521 | |
6666032a LE |
1522 | /* even though we trust out peer, |
1523 | * we sometimes have to double check. */ | |
1524 | if (sector + (data_size>>9) > capacity) { | |
fdda6544 LE |
1525 | dev_err(DEV, "request from peer beyond end of local disk: " |
1526 | "capacity: %llus < sector: %llus + size: %u\n", | |
6666032a LE |
1527 | (unsigned long long)capacity, |
1528 | (unsigned long long)sector, data_size); | |
1529 | return NULL; | |
1530 | } | |
1531 | ||
b411b363 PR |
1532 | /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD |
1533 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
1534 | * which in turn might block on the other node at this very place. */ | |
0db55363 | 1535 | peer_req = drbd_alloc_peer_req(mdev, id, sector, data_size, GFP_NOIO); |
db830c46 | 1536 | if (!peer_req) |
b411b363 | 1537 | return NULL; |
45bb912b | 1538 | |
81a3537a LE |
1539 | if (!data_size) |
1540 | return peer_req; | |
1541 | ||
b411b363 | 1542 | ds = data_size; |
db830c46 | 1543 | page = peer_req->pages; |
45bb912b LE |
1544 | page_chain_for_each(page) { |
1545 | unsigned len = min_t(int, ds, PAGE_SIZE); | |
6b4388ac | 1546 | data = kmap(page); |
a5c31904 | 1547 | err = drbd_recv_all_warn(mdev->tconn, data, len); |
0cf9d27e | 1548 | if (drbd_insert_fault(mdev, DRBD_FAULT_RECEIVE)) { |
6b4388ac PR |
1549 | dev_err(DEV, "Fault injection: Corrupting data on receive\n"); |
1550 | data[0] = data[0] ^ (unsigned long)-1; | |
1551 | } | |
b411b363 | 1552 | kunmap(page); |
a5c31904 | 1553 | if (err) { |
3967deb1 | 1554 | drbd_free_peer_req(mdev, peer_req); |
b411b363 PR |
1555 | return NULL; |
1556 | } | |
a5c31904 | 1557 | ds -= len; |
b411b363 PR |
1558 | } |
1559 | ||
1560 | if (dgs) { | |
5b614abe | 1561 | drbd_csum_ee(mdev, mdev->tconn->peer_integrity_tfm, peer_req, dig_vv); |
b411b363 | 1562 | if (memcmp(dig_in, dig_vv, dgs)) { |
470be44a LE |
1563 | dev_err(DEV, "Digest integrity check FAILED: %llus +%u\n", |
1564 | (unsigned long long)sector, data_size); | |
3967deb1 | 1565 | drbd_free_peer_req(mdev, peer_req); |
b411b363 PR |
1566 | return NULL; |
1567 | } | |
1568 | } | |
1569 | mdev->recv_cnt += data_size>>9; | |
db830c46 | 1570 | return peer_req; |
b411b363 PR |
1571 | } |
1572 | ||
1573 | /* drbd_drain_block() just takes a data block | |
1574 | * out of the socket input buffer, and discards it. | |
1575 | */ | |
1576 | static int drbd_drain_block(struct drbd_conf *mdev, int data_size) | |
1577 | { | |
1578 | struct page *page; | |
a5c31904 | 1579 | int err = 0; |
b411b363 PR |
1580 | void *data; |
1581 | ||
c3470cde | 1582 | if (!data_size) |
fc5be839 | 1583 | return 0; |
c3470cde | 1584 | |
c37c8ecf | 1585 | page = drbd_alloc_pages(mdev, 1, 1); |
b411b363 PR |
1586 | |
1587 | data = kmap(page); | |
1588 | while (data_size) { | |
fc5be839 AG |
1589 | unsigned int len = min_t(int, data_size, PAGE_SIZE); |
1590 | ||
a5c31904 AG |
1591 | err = drbd_recv_all_warn(mdev->tconn, data, len); |
1592 | if (err) | |
b411b363 | 1593 | break; |
a5c31904 | 1594 | data_size -= len; |
b411b363 PR |
1595 | } |
1596 | kunmap(page); | |
5cc287e0 | 1597 | drbd_free_pages(mdev, page, 0); |
fc5be839 | 1598 | return err; |
b411b363 PR |
1599 | } |
1600 | ||
1601 | static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req, | |
1602 | sector_t sector, int data_size) | |
1603 | { | |
1604 | struct bio_vec *bvec; | |
1605 | struct bio *bio; | |
a5c31904 | 1606 | int dgs, err, i, expect; |
a0638456 PR |
1607 | void *dig_in = mdev->tconn->int_dig_in; |
1608 | void *dig_vv = mdev->tconn->int_dig_vv; | |
b411b363 | 1609 | |
88104ca4 AG |
1610 | dgs = 0; |
1611 | if (mdev->tconn->peer_integrity_tfm) { | |
1612 | dgs = crypto_hash_digestsize(mdev->tconn->peer_integrity_tfm); | |
a5c31904 AG |
1613 | err = drbd_recv_all_warn(mdev->tconn, dig_in, dgs); |
1614 | if (err) | |
1615 | return err; | |
88104ca4 | 1616 | data_size -= dgs; |
b411b363 PR |
1617 | } |
1618 | ||
b411b363 PR |
1619 | /* optimistically update recv_cnt. if receiving fails below, |
1620 | * we disconnect anyways, and counters will be reset. */ | |
1621 | mdev->recv_cnt += data_size>>9; | |
1622 | ||
1623 | bio = req->master_bio; | |
1624 | D_ASSERT(sector == bio->bi_sector); | |
1625 | ||
1626 | bio_for_each_segment(bvec, bio, i) { | |
a5c31904 | 1627 | void *mapped = kmap(bvec->bv_page) + bvec->bv_offset; |
b411b363 | 1628 | expect = min_t(int, data_size, bvec->bv_len); |
a5c31904 | 1629 | err = drbd_recv_all_warn(mdev->tconn, mapped, expect); |
b411b363 | 1630 | kunmap(bvec->bv_page); |
a5c31904 AG |
1631 | if (err) |
1632 | return err; | |
1633 | data_size -= expect; | |
b411b363 PR |
1634 | } |
1635 | ||
1636 | if (dgs) { | |
5b614abe | 1637 | drbd_csum_bio(mdev, mdev->tconn->peer_integrity_tfm, bio, dig_vv); |
b411b363 PR |
1638 | if (memcmp(dig_in, dig_vv, dgs)) { |
1639 | dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n"); | |
28284cef | 1640 | return -EINVAL; |
b411b363 PR |
1641 | } |
1642 | } | |
1643 | ||
1644 | D_ASSERT(data_size == 0); | |
28284cef | 1645 | return 0; |
b411b363 PR |
1646 | } |
1647 | ||
a990be46 AG |
1648 | /* |
1649 | * e_end_resync_block() is called in asender context via | |
1650 | * drbd_finish_peer_reqs(). | |
1651 | */ | |
99920dc5 | 1652 | static int e_end_resync_block(struct drbd_work *w, int unused) |
b411b363 | 1653 | { |
8050e6d0 AG |
1654 | struct drbd_peer_request *peer_req = |
1655 | container_of(w, struct drbd_peer_request, w); | |
00d56944 | 1656 | struct drbd_conf *mdev = w->mdev; |
db830c46 | 1657 | sector_t sector = peer_req->i.sector; |
99920dc5 | 1658 | int err; |
b411b363 | 1659 | |
db830c46 | 1660 | D_ASSERT(drbd_interval_empty(&peer_req->i)); |
b411b363 | 1661 | |
db830c46 AG |
1662 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
1663 | drbd_set_in_sync(mdev, sector, peer_req->i.size); | |
99920dc5 | 1664 | err = drbd_send_ack(mdev, P_RS_WRITE_ACK, peer_req); |
b411b363 PR |
1665 | } else { |
1666 | /* Record failure to sync */ | |
db830c46 | 1667 | drbd_rs_failed_io(mdev, sector, peer_req->i.size); |
b411b363 | 1668 | |
99920dc5 | 1669 | err = drbd_send_ack(mdev, P_NEG_ACK, peer_req); |
b411b363 PR |
1670 | } |
1671 | dec_unacked(mdev); | |
1672 | ||
99920dc5 | 1673 | return err; |
b411b363 PR |
1674 | } |
1675 | ||
1676 | static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local) | |
1677 | { | |
db830c46 | 1678 | struct drbd_peer_request *peer_req; |
b411b363 | 1679 | |
db830c46 AG |
1680 | peer_req = read_in_block(mdev, ID_SYNCER, sector, data_size); |
1681 | if (!peer_req) | |
45bb912b | 1682 | goto fail; |
b411b363 PR |
1683 | |
1684 | dec_rs_pending(mdev); | |
1685 | ||
b411b363 PR |
1686 | inc_unacked(mdev); |
1687 | /* corresponding dec_unacked() in e_end_resync_block() | |
1688 | * respective _drbd_clear_done_ee */ | |
1689 | ||
db830c46 | 1690 | peer_req->w.cb = e_end_resync_block; |
45bb912b | 1691 | |
87eeee41 | 1692 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 | 1693 | list_add(&peer_req->w.list, &mdev->sync_ee); |
87eeee41 | 1694 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 1695 | |
0f0601f4 | 1696 | atomic_add(data_size >> 9, &mdev->rs_sect_ev); |
fbe29dec | 1697 | if (drbd_submit_peer_request(mdev, peer_req, WRITE, DRBD_FAULT_RS_WR) == 0) |
e1c1b0fc | 1698 | return 0; |
b411b363 | 1699 | |
10f6d992 LE |
1700 | /* don't care for the reason here */ |
1701 | dev_err(DEV, "submit failed, triggering re-connect\n"); | |
87eeee41 | 1702 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 | 1703 | list_del(&peer_req->w.list); |
87eeee41 | 1704 | spin_unlock_irq(&mdev->tconn->req_lock); |
22cc37a9 | 1705 | |
3967deb1 | 1706 | drbd_free_peer_req(mdev, peer_req); |
45bb912b LE |
1707 | fail: |
1708 | put_ldev(mdev); | |
e1c1b0fc | 1709 | return -EIO; |
b411b363 PR |
1710 | } |
1711 | ||
668eebc6 | 1712 | static struct drbd_request * |
bc9c5c41 AG |
1713 | find_request(struct drbd_conf *mdev, struct rb_root *root, u64 id, |
1714 | sector_t sector, bool missing_ok, const char *func) | |
51624585 | 1715 | { |
51624585 AG |
1716 | struct drbd_request *req; |
1717 | ||
bc9c5c41 AG |
1718 | /* Request object according to our peer */ |
1719 | req = (struct drbd_request *)(unsigned long)id; | |
5e472264 | 1720 | if (drbd_contains_interval(root, sector, &req->i) && req->i.local) |
668eebc6 | 1721 | return req; |
c3afd8f5 | 1722 | if (!missing_ok) { |
5af172ed | 1723 | dev_err(DEV, "%s: failed to find request 0x%lx, sector %llus\n", func, |
c3afd8f5 AG |
1724 | (unsigned long)id, (unsigned long long)sector); |
1725 | } | |
51624585 AG |
1726 | return NULL; |
1727 | } | |
1728 | ||
4a76b161 | 1729 | static int receive_DataReply(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 1730 | { |
4a76b161 | 1731 | struct drbd_conf *mdev; |
b411b363 PR |
1732 | struct drbd_request *req; |
1733 | sector_t sector; | |
82bc0194 | 1734 | int err; |
e658983a | 1735 | struct p_data *p = pi->data; |
4a76b161 AG |
1736 | |
1737 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
1738 | if (!mdev) | |
1739 | return -EIO; | |
b411b363 PR |
1740 | |
1741 | sector = be64_to_cpu(p->sector); | |
1742 | ||
87eeee41 | 1743 | spin_lock_irq(&mdev->tconn->req_lock); |
bc9c5c41 | 1744 | req = find_request(mdev, &mdev->read_requests, p->block_id, sector, false, __func__); |
87eeee41 | 1745 | spin_unlock_irq(&mdev->tconn->req_lock); |
c3afd8f5 | 1746 | if (unlikely(!req)) |
82bc0194 | 1747 | return -EIO; |
b411b363 | 1748 | |
24c4830c | 1749 | /* hlist_del(&req->collision) is done in _req_may_be_done, to avoid |
b411b363 PR |
1750 | * special casing it there for the various failure cases. |
1751 | * still no race with drbd_fail_pending_reads */ | |
e2857216 | 1752 | err = recv_dless_read(mdev, req, sector, pi->size); |
82bc0194 | 1753 | if (!err) |
8554df1c | 1754 | req_mod(req, DATA_RECEIVED); |
b411b363 PR |
1755 | /* else: nothing. handled from drbd_disconnect... |
1756 | * I don't think we may complete this just yet | |
1757 | * in case we are "on-disconnect: freeze" */ | |
1758 | ||
82bc0194 | 1759 | return err; |
b411b363 PR |
1760 | } |
1761 | ||
4a76b161 | 1762 | static int receive_RSDataReply(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 1763 | { |
4a76b161 | 1764 | struct drbd_conf *mdev; |
b411b363 | 1765 | sector_t sector; |
82bc0194 | 1766 | int err; |
e658983a | 1767 | struct p_data *p = pi->data; |
4a76b161 AG |
1768 | |
1769 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
1770 | if (!mdev) | |
1771 | return -EIO; | |
b411b363 PR |
1772 | |
1773 | sector = be64_to_cpu(p->sector); | |
1774 | D_ASSERT(p->block_id == ID_SYNCER); | |
1775 | ||
1776 | if (get_ldev(mdev)) { | |
1777 | /* data is submitted to disk within recv_resync_read. | |
1778 | * corresponding put_ldev done below on error, | |
fcefa62e | 1779 | * or in drbd_peer_request_endio. */ |
e2857216 | 1780 | err = recv_resync_read(mdev, sector, pi->size); |
b411b363 PR |
1781 | } else { |
1782 | if (__ratelimit(&drbd_ratelimit_state)) | |
1783 | dev_err(DEV, "Can not write resync data to local disk.\n"); | |
1784 | ||
e2857216 | 1785 | err = drbd_drain_block(mdev, pi->size); |
b411b363 | 1786 | |
e2857216 | 1787 | drbd_send_ack_dp(mdev, P_NEG_ACK, p, pi->size); |
b411b363 PR |
1788 | } |
1789 | ||
e2857216 | 1790 | atomic_add(pi->size >> 9, &mdev->rs_sect_in); |
778f271d | 1791 | |
82bc0194 | 1792 | return err; |
b411b363 PR |
1793 | } |
1794 | ||
7be8da07 AG |
1795 | static void restart_conflicting_writes(struct drbd_conf *mdev, |
1796 | sector_t sector, int size) | |
1797 | { | |
1798 | struct drbd_interval *i; | |
1799 | struct drbd_request *req; | |
1800 | ||
1801 | drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { | |
1802 | if (!i->local) | |
1803 | continue; | |
1804 | req = container_of(i, struct drbd_request, i); | |
1805 | if (req->rq_state & RQ_LOCAL_PENDING || | |
1806 | !(req->rq_state & RQ_POSTPONED)) | |
1807 | continue; | |
2312f0b3 LE |
1808 | /* as it is RQ_POSTPONED, this will cause it to |
1809 | * be queued on the retry workqueue. */ | |
1810 | __req_mod(req, DISCARD_WRITE, NULL); | |
7be8da07 AG |
1811 | } |
1812 | } | |
1813 | ||
a990be46 AG |
1814 | /* |
1815 | * e_end_block() is called in asender context via drbd_finish_peer_reqs(). | |
b411b363 | 1816 | */ |
99920dc5 | 1817 | static int e_end_block(struct drbd_work *w, int cancel) |
b411b363 | 1818 | { |
8050e6d0 AG |
1819 | struct drbd_peer_request *peer_req = |
1820 | container_of(w, struct drbd_peer_request, w); | |
00d56944 | 1821 | struct drbd_conf *mdev = w->mdev; |
db830c46 | 1822 | sector_t sector = peer_req->i.sector; |
99920dc5 | 1823 | int err = 0, pcmd; |
b411b363 | 1824 | |
303d1448 | 1825 | if (peer_req->flags & EE_SEND_WRITE_ACK) { |
db830c46 | 1826 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
1827 | pcmd = (mdev->state.conn >= C_SYNC_SOURCE && |
1828 | mdev->state.conn <= C_PAUSED_SYNC_T && | |
db830c46 | 1829 | peer_req->flags & EE_MAY_SET_IN_SYNC) ? |
b411b363 | 1830 | P_RS_WRITE_ACK : P_WRITE_ACK; |
99920dc5 | 1831 | err = drbd_send_ack(mdev, pcmd, peer_req); |
b411b363 | 1832 | if (pcmd == P_RS_WRITE_ACK) |
db830c46 | 1833 | drbd_set_in_sync(mdev, sector, peer_req->i.size); |
b411b363 | 1834 | } else { |
99920dc5 | 1835 | err = drbd_send_ack(mdev, P_NEG_ACK, peer_req); |
b411b363 PR |
1836 | /* we expect it to be marked out of sync anyways... |
1837 | * maybe assert this? */ | |
1838 | } | |
1839 | dec_unacked(mdev); | |
1840 | } | |
1841 | /* we delete from the conflict detection hash _after_ we sent out the | |
1842 | * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ | |
302bdeae | 1843 | if (peer_req->flags & EE_IN_INTERVAL_TREE) { |
87eeee41 | 1844 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 AG |
1845 | D_ASSERT(!drbd_interval_empty(&peer_req->i)); |
1846 | drbd_remove_epoch_entry_interval(mdev, peer_req); | |
7be8da07 AG |
1847 | if (peer_req->flags & EE_RESTART_REQUESTS) |
1848 | restart_conflicting_writes(mdev, sector, peer_req->i.size); | |
87eeee41 | 1849 | spin_unlock_irq(&mdev->tconn->req_lock); |
bb3bfe96 | 1850 | } else |
db830c46 | 1851 | D_ASSERT(drbd_interval_empty(&peer_req->i)); |
b411b363 | 1852 | |
1e9dd291 | 1853 | drbd_may_finish_epoch(mdev->tconn, peer_req->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); |
b411b363 | 1854 | |
99920dc5 | 1855 | return err; |
b411b363 PR |
1856 | } |
1857 | ||
7be8da07 | 1858 | static int e_send_ack(struct drbd_work *w, enum drbd_packet ack) |
b411b363 | 1859 | { |
7be8da07 | 1860 | struct drbd_conf *mdev = w->mdev; |
8050e6d0 AG |
1861 | struct drbd_peer_request *peer_req = |
1862 | container_of(w, struct drbd_peer_request, w); | |
99920dc5 | 1863 | int err; |
b411b363 | 1864 | |
99920dc5 | 1865 | err = drbd_send_ack(mdev, ack, peer_req); |
b411b363 PR |
1866 | dec_unacked(mdev); |
1867 | ||
99920dc5 | 1868 | return err; |
b411b363 PR |
1869 | } |
1870 | ||
99920dc5 | 1871 | static int e_send_discard_write(struct drbd_work *w, int unused) |
7be8da07 AG |
1872 | { |
1873 | return e_send_ack(w, P_DISCARD_WRITE); | |
1874 | } | |
1875 | ||
99920dc5 | 1876 | static int e_send_retry_write(struct drbd_work *w, int unused) |
7be8da07 AG |
1877 | { |
1878 | struct drbd_tconn *tconn = w->mdev->tconn; | |
1879 | ||
1880 | return e_send_ack(w, tconn->agreed_pro_version >= 100 ? | |
1881 | P_RETRY_WRITE : P_DISCARD_WRITE); | |
1882 | } | |
1883 | ||
3e394da1 AG |
1884 | static bool seq_greater(u32 a, u32 b) |
1885 | { | |
1886 | /* | |
1887 | * We assume 32-bit wrap-around here. | |
1888 | * For 24-bit wrap-around, we would have to shift: | |
1889 | * a <<= 8; b <<= 8; | |
1890 | */ | |
1891 | return (s32)a - (s32)b > 0; | |
1892 | } | |
1893 | ||
1894 | static u32 seq_max(u32 a, u32 b) | |
1895 | { | |
1896 | return seq_greater(a, b) ? a : b; | |
1897 | } | |
1898 | ||
7be8da07 AG |
1899 | static bool need_peer_seq(struct drbd_conf *mdev) |
1900 | { | |
1901 | struct drbd_tconn *tconn = mdev->tconn; | |
302bdeae | 1902 | int tp; |
7be8da07 AG |
1903 | |
1904 | /* | |
1905 | * We only need to keep track of the last packet_seq number of our peer | |
1906 | * if we are in dual-primary mode and we have the discard flag set; see | |
1907 | * handle_write_conflicts(). | |
1908 | */ | |
302bdeae PR |
1909 | |
1910 | rcu_read_lock(); | |
1911 | tp = rcu_dereference(mdev->tconn->net_conf)->two_primaries; | |
1912 | rcu_read_unlock(); | |
1913 | ||
1914 | return tp && test_bit(DISCARD_CONCURRENT, &tconn->flags); | |
7be8da07 AG |
1915 | } |
1916 | ||
43ae077d | 1917 | static void update_peer_seq(struct drbd_conf *mdev, unsigned int peer_seq) |
3e394da1 | 1918 | { |
3c13b680 | 1919 | unsigned int newest_peer_seq; |
3e394da1 | 1920 | |
7be8da07 AG |
1921 | if (need_peer_seq(mdev)) { |
1922 | spin_lock(&mdev->peer_seq_lock); | |
3c13b680 LE |
1923 | newest_peer_seq = seq_max(mdev->peer_seq, peer_seq); |
1924 | mdev->peer_seq = newest_peer_seq; | |
7be8da07 | 1925 | spin_unlock(&mdev->peer_seq_lock); |
3c13b680 LE |
1926 | /* wake up only if we actually changed mdev->peer_seq */ |
1927 | if (peer_seq == newest_peer_seq) | |
7be8da07 AG |
1928 | wake_up(&mdev->seq_wait); |
1929 | } | |
3e394da1 AG |
1930 | } |
1931 | ||
d93f6302 LE |
1932 | static inline int overlaps(sector_t s1, int l1, sector_t s2, int l2) |
1933 | { | |
1934 | return !((s1 + (l1>>9) <= s2) || (s1 >= s2 + (l2>>9))); | |
1935 | } | |
1936 | ||
1937 | /* maybe change sync_ee into interval trees as well? */ | |
3ea35df8 | 1938 | static bool overlapping_resync_write(struct drbd_conf *mdev, struct drbd_peer_request *peer_req) |
d93f6302 LE |
1939 | { |
1940 | struct drbd_peer_request *rs_req; | |
1941 | bool rv = 0; | |
1942 | ||
1943 | spin_lock_irq(&mdev->tconn->req_lock); | |
1944 | list_for_each_entry(rs_req, &mdev->sync_ee, w.list) { | |
1945 | if (overlaps(peer_req->i.sector, peer_req->i.size, | |
1946 | rs_req->i.sector, rs_req->i.size)) { | |
1947 | rv = 1; | |
1948 | break; | |
1949 | } | |
1950 | } | |
1951 | spin_unlock_irq(&mdev->tconn->req_lock); | |
1952 | ||
d93f6302 LE |
1953 | return rv; |
1954 | } | |
1955 | ||
b411b363 PR |
1956 | /* Called from receive_Data. |
1957 | * Synchronize packets on sock with packets on msock. | |
1958 | * | |
1959 | * This is here so even when a P_DATA packet traveling via sock overtook an Ack | |
1960 | * packet traveling on msock, they are still processed in the order they have | |
1961 | * been sent. | |
1962 | * | |
1963 | * Note: we don't care for Ack packets overtaking P_DATA packets. | |
1964 | * | |
1965 | * In case packet_seq is larger than mdev->peer_seq number, there are | |
1966 | * outstanding packets on the msock. We wait for them to arrive. | |
1967 | * In case we are the logically next packet, we update mdev->peer_seq | |
1968 | * ourselves. Correctly handles 32bit wrap around. | |
1969 | * | |
1970 | * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, | |
1971 | * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds | |
1972 | * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have | |
1973 | * 1<<9 == 512 seconds aka ages for the 32bit wrap around... | |
1974 | * | |
1975 | * returns 0 if we may process the packet, | |
1976 | * -ERESTARTSYS if we were interrupted (by disconnect signal). */ | |
7be8da07 | 1977 | static int wait_for_and_update_peer_seq(struct drbd_conf *mdev, const u32 peer_seq) |
b411b363 PR |
1978 | { |
1979 | DEFINE_WAIT(wait); | |
b411b363 | 1980 | long timeout; |
7be8da07 AG |
1981 | int ret; |
1982 | ||
1983 | if (!need_peer_seq(mdev)) | |
1984 | return 0; | |
1985 | ||
b411b363 PR |
1986 | spin_lock(&mdev->peer_seq_lock); |
1987 | for (;;) { | |
7be8da07 AG |
1988 | if (!seq_greater(peer_seq - 1, mdev->peer_seq)) { |
1989 | mdev->peer_seq = seq_max(mdev->peer_seq, peer_seq); | |
1990 | ret = 0; | |
b411b363 | 1991 | break; |
7be8da07 | 1992 | } |
b411b363 PR |
1993 | if (signal_pending(current)) { |
1994 | ret = -ERESTARTSYS; | |
1995 | break; | |
1996 | } | |
7be8da07 | 1997 | prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE); |
b411b363 | 1998 | spin_unlock(&mdev->peer_seq_lock); |
44ed167d PR |
1999 | rcu_read_lock(); |
2000 | timeout = rcu_dereference(mdev->tconn->net_conf)->ping_timeo*HZ/10; | |
2001 | rcu_read_unlock(); | |
71b1c1eb | 2002 | timeout = schedule_timeout(timeout); |
b411b363 | 2003 | spin_lock(&mdev->peer_seq_lock); |
7be8da07 | 2004 | if (!timeout) { |
b411b363 | 2005 | ret = -ETIMEDOUT; |
71b1c1eb | 2006 | dev_err(DEV, "Timed out waiting for missing ack packets; disconnecting\n"); |
b411b363 PR |
2007 | break; |
2008 | } | |
2009 | } | |
b411b363 | 2010 | spin_unlock(&mdev->peer_seq_lock); |
7be8da07 | 2011 | finish_wait(&mdev->seq_wait, &wait); |
b411b363 PR |
2012 | return ret; |
2013 | } | |
2014 | ||
688593c5 LE |
2015 | /* see also bio_flags_to_wire() |
2016 | * DRBD_REQ_*, because we need to semantically map the flags to data packet | |
2017 | * flags and back. We may replicate to other kernel versions. */ | |
2018 | static unsigned long wire_flags_to_bio(struct drbd_conf *mdev, u32 dpf) | |
76d2e7ec | 2019 | { |
688593c5 LE |
2020 | return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | |
2021 | (dpf & DP_FUA ? REQ_FUA : 0) | | |
2022 | (dpf & DP_FLUSH ? REQ_FLUSH : 0) | | |
2023 | (dpf & DP_DISCARD ? REQ_DISCARD : 0); | |
76d2e7ec PR |
2024 | } |
2025 | ||
7be8da07 AG |
2026 | static void fail_postponed_requests(struct drbd_conf *mdev, sector_t sector, |
2027 | unsigned int size) | |
2028 | { | |
2029 | struct drbd_interval *i; | |
2030 | ||
2031 | repeat: | |
2032 | drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { | |
2033 | struct drbd_request *req; | |
2034 | struct bio_and_error m; | |
2035 | ||
2036 | if (!i->local) | |
2037 | continue; | |
2038 | req = container_of(i, struct drbd_request, i); | |
2039 | if (!(req->rq_state & RQ_POSTPONED)) | |
2040 | continue; | |
2041 | req->rq_state &= ~RQ_POSTPONED; | |
2042 | __req_mod(req, NEG_ACKED, &m); | |
2043 | spin_unlock_irq(&mdev->tconn->req_lock); | |
2044 | if (m.bio) | |
2045 | complete_master_bio(mdev, &m); | |
2046 | spin_lock_irq(&mdev->tconn->req_lock); | |
2047 | goto repeat; | |
2048 | } | |
2049 | } | |
2050 | ||
2051 | static int handle_write_conflicts(struct drbd_conf *mdev, | |
2052 | struct drbd_peer_request *peer_req) | |
2053 | { | |
2054 | struct drbd_tconn *tconn = mdev->tconn; | |
2055 | bool resolve_conflicts = test_bit(DISCARD_CONCURRENT, &tconn->flags); | |
2056 | sector_t sector = peer_req->i.sector; | |
2057 | const unsigned int size = peer_req->i.size; | |
2058 | struct drbd_interval *i; | |
2059 | bool equal; | |
2060 | int err; | |
2061 | ||
2062 | /* | |
2063 | * Inserting the peer request into the write_requests tree will prevent | |
2064 | * new conflicting local requests from being added. | |
2065 | */ | |
2066 | drbd_insert_interval(&mdev->write_requests, &peer_req->i); | |
2067 | ||
2068 | repeat: | |
2069 | drbd_for_each_overlap(i, &mdev->write_requests, sector, size) { | |
2070 | if (i == &peer_req->i) | |
2071 | continue; | |
2072 | ||
2073 | if (!i->local) { | |
2074 | /* | |
2075 | * Our peer has sent a conflicting remote request; this | |
2076 | * should not happen in a two-node setup. Wait for the | |
2077 | * earlier peer request to complete. | |
2078 | */ | |
2079 | err = drbd_wait_misc(mdev, i); | |
2080 | if (err) | |
2081 | goto out; | |
2082 | goto repeat; | |
2083 | } | |
2084 | ||
2085 | equal = i->sector == sector && i->size == size; | |
2086 | if (resolve_conflicts) { | |
2087 | /* | |
2088 | * If the peer request is fully contained within the | |
2089 | * overlapping request, it can be discarded; otherwise, | |
2090 | * it will be retried once all overlapping requests | |
2091 | * have completed. | |
2092 | */ | |
2093 | bool discard = i->sector <= sector && i->sector + | |
2094 | (i->size >> 9) >= sector + (size >> 9); | |
2095 | ||
2096 | if (!equal) | |
2097 | dev_alert(DEV, "Concurrent writes detected: " | |
2098 | "local=%llus +%u, remote=%llus +%u, " | |
2099 | "assuming %s came first\n", | |
2100 | (unsigned long long)i->sector, i->size, | |
2101 | (unsigned long long)sector, size, | |
2102 | discard ? "local" : "remote"); | |
2103 | ||
2104 | inc_unacked(mdev); | |
2105 | peer_req->w.cb = discard ? e_send_discard_write : | |
2106 | e_send_retry_write; | |
2107 | list_add_tail(&peer_req->w.list, &mdev->done_ee); | |
2108 | wake_asender(mdev->tconn); | |
2109 | ||
2110 | err = -ENOENT; | |
2111 | goto out; | |
2112 | } else { | |
2113 | struct drbd_request *req = | |
2114 | container_of(i, struct drbd_request, i); | |
2115 | ||
2116 | if (!equal) | |
2117 | dev_alert(DEV, "Concurrent writes detected: " | |
2118 | "local=%llus +%u, remote=%llus +%u\n", | |
2119 | (unsigned long long)i->sector, i->size, | |
2120 | (unsigned long long)sector, size); | |
2121 | ||
2122 | if (req->rq_state & RQ_LOCAL_PENDING || | |
2123 | !(req->rq_state & RQ_POSTPONED)) { | |
2124 | /* | |
2125 | * Wait for the node with the discard flag to | |
2126 | * decide if this request will be discarded or | |
2127 | * retried. Requests that are discarded will | |
2128 | * disappear from the write_requests tree. | |
2129 | * | |
2130 | * In addition, wait for the conflicting | |
2131 | * request to finish locally before submitting | |
2132 | * the conflicting peer request. | |
2133 | */ | |
2134 | err = drbd_wait_misc(mdev, &req->i); | |
2135 | if (err) { | |
2136 | _conn_request_state(mdev->tconn, | |
2137 | NS(conn, C_TIMEOUT), | |
2138 | CS_HARD); | |
2139 | fail_postponed_requests(mdev, sector, size); | |
2140 | goto out; | |
2141 | } | |
2142 | goto repeat; | |
2143 | } | |
2144 | /* | |
2145 | * Remember to restart the conflicting requests after | |
2146 | * the new peer request has completed. | |
2147 | */ | |
2148 | peer_req->flags |= EE_RESTART_REQUESTS; | |
2149 | } | |
2150 | } | |
2151 | err = 0; | |
2152 | ||
2153 | out: | |
2154 | if (err) | |
2155 | drbd_remove_epoch_entry_interval(mdev, peer_req); | |
2156 | return err; | |
2157 | } | |
2158 | ||
b411b363 | 2159 | /* mirrored write */ |
4a76b161 | 2160 | static int receive_Data(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 2161 | { |
4a76b161 | 2162 | struct drbd_conf *mdev; |
b411b363 | 2163 | sector_t sector; |
db830c46 | 2164 | struct drbd_peer_request *peer_req; |
e658983a | 2165 | struct p_data *p = pi->data; |
7be8da07 | 2166 | u32 peer_seq = be32_to_cpu(p->seq_num); |
b411b363 PR |
2167 | int rw = WRITE; |
2168 | u32 dp_flags; | |
302bdeae | 2169 | int err, tp; |
b411b363 | 2170 | |
4a76b161 AG |
2171 | mdev = vnr_to_mdev(tconn, pi->vnr); |
2172 | if (!mdev) | |
2173 | return -EIO; | |
2174 | ||
7be8da07 | 2175 | if (!get_ldev(mdev)) { |
82bc0194 AG |
2176 | int err2; |
2177 | ||
7be8da07 | 2178 | err = wait_for_and_update_peer_seq(mdev, peer_seq); |
e2857216 | 2179 | drbd_send_ack_dp(mdev, P_NEG_ACK, p, pi->size); |
12038a3a | 2180 | atomic_inc(&tconn->current_epoch->epoch_size); |
e2857216 | 2181 | err2 = drbd_drain_block(mdev, pi->size); |
82bc0194 AG |
2182 | if (!err) |
2183 | err = err2; | |
2184 | return err; | |
b411b363 PR |
2185 | } |
2186 | ||
fcefa62e AG |
2187 | /* |
2188 | * Corresponding put_ldev done either below (on various errors), or in | |
2189 | * drbd_peer_request_endio, if we successfully submit the data at the | |
2190 | * end of this function. | |
2191 | */ | |
b411b363 PR |
2192 | |
2193 | sector = be64_to_cpu(p->sector); | |
e2857216 | 2194 | peer_req = read_in_block(mdev, p->block_id, sector, pi->size); |
db830c46 | 2195 | if (!peer_req) { |
b411b363 | 2196 | put_ldev(mdev); |
82bc0194 | 2197 | return -EIO; |
b411b363 PR |
2198 | } |
2199 | ||
db830c46 | 2200 | peer_req->w.cb = e_end_block; |
b411b363 | 2201 | |
688593c5 LE |
2202 | dp_flags = be32_to_cpu(p->dp_flags); |
2203 | rw |= wire_flags_to_bio(mdev, dp_flags); | |
81a3537a LE |
2204 | if (peer_req->pages == NULL) { |
2205 | D_ASSERT(peer_req->i.size == 0); | |
2206 | D_ASSERT(dp_flags & DP_FLUSH); | |
2207 | } | |
688593c5 LE |
2208 | |
2209 | if (dp_flags & DP_MAY_SET_IN_SYNC) | |
db830c46 | 2210 | peer_req->flags |= EE_MAY_SET_IN_SYNC; |
688593c5 | 2211 | |
12038a3a PR |
2212 | spin_lock(&tconn->epoch_lock); |
2213 | peer_req->epoch = tconn->current_epoch; | |
db830c46 AG |
2214 | atomic_inc(&peer_req->epoch->epoch_size); |
2215 | atomic_inc(&peer_req->epoch->active); | |
12038a3a | 2216 | spin_unlock(&tconn->epoch_lock); |
b411b363 | 2217 | |
302bdeae PR |
2218 | rcu_read_lock(); |
2219 | tp = rcu_dereference(mdev->tconn->net_conf)->two_primaries; | |
2220 | rcu_read_unlock(); | |
2221 | if (tp) { | |
2222 | peer_req->flags |= EE_IN_INTERVAL_TREE; | |
7be8da07 AG |
2223 | err = wait_for_and_update_peer_seq(mdev, peer_seq); |
2224 | if (err) | |
b411b363 | 2225 | goto out_interrupted; |
87eeee41 | 2226 | spin_lock_irq(&mdev->tconn->req_lock); |
7be8da07 AG |
2227 | err = handle_write_conflicts(mdev, peer_req); |
2228 | if (err) { | |
2229 | spin_unlock_irq(&mdev->tconn->req_lock); | |
2230 | if (err == -ENOENT) { | |
b411b363 | 2231 | put_ldev(mdev); |
82bc0194 | 2232 | return 0; |
b411b363 | 2233 | } |
7be8da07 | 2234 | goto out_interrupted; |
b411b363 | 2235 | } |
7be8da07 AG |
2236 | } else |
2237 | spin_lock_irq(&mdev->tconn->req_lock); | |
db830c46 | 2238 | list_add(&peer_req->w.list, &mdev->active_ee); |
87eeee41 | 2239 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 2240 | |
d93f6302 | 2241 | if (mdev->state.conn == C_SYNC_TARGET) |
3ea35df8 | 2242 | wait_event(mdev->ee_wait, !overlapping_resync_write(mdev, peer_req)); |
d93f6302 | 2243 | |
303d1448 | 2244 | if (mdev->tconn->agreed_pro_version < 100) { |
44ed167d PR |
2245 | rcu_read_lock(); |
2246 | switch (rcu_dereference(mdev->tconn->net_conf)->wire_protocol) { | |
303d1448 PR |
2247 | case DRBD_PROT_C: |
2248 | dp_flags |= DP_SEND_WRITE_ACK; | |
2249 | break; | |
2250 | case DRBD_PROT_B: | |
2251 | dp_flags |= DP_SEND_RECEIVE_ACK; | |
2252 | break; | |
2253 | } | |
44ed167d | 2254 | rcu_read_unlock(); |
303d1448 PR |
2255 | } |
2256 | ||
2257 | if (dp_flags & DP_SEND_WRITE_ACK) { | |
2258 | peer_req->flags |= EE_SEND_WRITE_ACK; | |
b411b363 PR |
2259 | inc_unacked(mdev); |
2260 | /* corresponding dec_unacked() in e_end_block() | |
2261 | * respective _drbd_clear_done_ee */ | |
303d1448 PR |
2262 | } |
2263 | ||
2264 | if (dp_flags & DP_SEND_RECEIVE_ACK) { | |
b411b363 PR |
2265 | /* I really don't like it that the receiver thread |
2266 | * sends on the msock, but anyways */ | |
db830c46 | 2267 | drbd_send_ack(mdev, P_RECV_ACK, peer_req); |
b411b363 PR |
2268 | } |
2269 | ||
6719fb03 | 2270 | if (mdev->state.pdsk < D_INCONSISTENT) { |
b411b363 | 2271 | /* In case we have the only disk of the cluster, */ |
db830c46 AG |
2272 | drbd_set_out_of_sync(mdev, peer_req->i.sector, peer_req->i.size); |
2273 | peer_req->flags |= EE_CALL_AL_COMPLETE_IO; | |
2274 | peer_req->flags &= ~EE_MAY_SET_IN_SYNC; | |
181286ad | 2275 | drbd_al_begin_io(mdev, &peer_req->i); |
b411b363 PR |
2276 | } |
2277 | ||
82bc0194 AG |
2278 | err = drbd_submit_peer_request(mdev, peer_req, rw, DRBD_FAULT_DT_WR); |
2279 | if (!err) | |
2280 | return 0; | |
b411b363 | 2281 | |
10f6d992 LE |
2282 | /* don't care for the reason here */ |
2283 | dev_err(DEV, "submit failed, triggering re-connect\n"); | |
87eeee41 | 2284 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 AG |
2285 | list_del(&peer_req->w.list); |
2286 | drbd_remove_epoch_entry_interval(mdev, peer_req); | |
87eeee41 | 2287 | spin_unlock_irq(&mdev->tconn->req_lock); |
db830c46 | 2288 | if (peer_req->flags & EE_CALL_AL_COMPLETE_IO) |
181286ad | 2289 | drbd_al_complete_io(mdev, &peer_req->i); |
22cc37a9 | 2290 | |
b411b363 | 2291 | out_interrupted: |
1e9dd291 | 2292 | drbd_may_finish_epoch(tconn, peer_req->epoch, EV_PUT + EV_CLEANUP); |
b411b363 | 2293 | put_ldev(mdev); |
3967deb1 | 2294 | drbd_free_peer_req(mdev, peer_req); |
82bc0194 | 2295 | return err; |
b411b363 PR |
2296 | } |
2297 | ||
0f0601f4 LE |
2298 | /* We may throttle resync, if the lower device seems to be busy, |
2299 | * and current sync rate is above c_min_rate. | |
2300 | * | |
2301 | * To decide whether or not the lower device is busy, we use a scheme similar | |
2302 | * to MD RAID is_mddev_idle(): if the partition stats reveal "significant" | |
2303 | * (more than 64 sectors) of activity we cannot account for with our own resync | |
2304 | * activity, it obviously is "busy". | |
2305 | * | |
2306 | * The current sync rate used here uses only the most recent two step marks, | |
2307 | * to have a short time average so we can react faster. | |
2308 | */ | |
e3555d85 | 2309 | int drbd_rs_should_slow_down(struct drbd_conf *mdev, sector_t sector) |
0f0601f4 LE |
2310 | { |
2311 | struct gendisk *disk = mdev->ldev->backing_bdev->bd_contains->bd_disk; | |
2312 | unsigned long db, dt, dbdt; | |
e3555d85 | 2313 | struct lc_element *tmp; |
0f0601f4 LE |
2314 | int curr_events; |
2315 | int throttle = 0; | |
daeda1cc PR |
2316 | unsigned int c_min_rate; |
2317 | ||
2318 | rcu_read_lock(); | |
2319 | c_min_rate = rcu_dereference(mdev->ldev->disk_conf)->c_min_rate; | |
2320 | rcu_read_unlock(); | |
0f0601f4 LE |
2321 | |
2322 | /* feature disabled? */ | |
daeda1cc | 2323 | if (c_min_rate == 0) |
0f0601f4 LE |
2324 | return 0; |
2325 | ||
e3555d85 PR |
2326 | spin_lock_irq(&mdev->al_lock); |
2327 | tmp = lc_find(mdev->resync, BM_SECT_TO_EXT(sector)); | |
2328 | if (tmp) { | |
2329 | struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); | |
2330 | if (test_bit(BME_PRIORITY, &bm_ext->flags)) { | |
2331 | spin_unlock_irq(&mdev->al_lock); | |
2332 | return 0; | |
2333 | } | |
2334 | /* Do not slow down if app IO is already waiting for this extent */ | |
2335 | } | |
2336 | spin_unlock_irq(&mdev->al_lock); | |
2337 | ||
0f0601f4 LE |
2338 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
2339 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
2340 | atomic_read(&mdev->rs_sect_ev); | |
e3555d85 | 2341 | |
0f0601f4 LE |
2342 | if (!mdev->rs_last_events || curr_events - mdev->rs_last_events > 64) { |
2343 | unsigned long rs_left; | |
2344 | int i; | |
2345 | ||
2346 | mdev->rs_last_events = curr_events; | |
2347 | ||
2348 | /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, | |
2349 | * approx. */ | |
2649f080 LE |
2350 | i = (mdev->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; |
2351 | ||
2352 | if (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T) | |
2353 | rs_left = mdev->ov_left; | |
2354 | else | |
2355 | rs_left = drbd_bm_total_weight(mdev) - mdev->rs_failed; | |
0f0601f4 LE |
2356 | |
2357 | dt = ((long)jiffies - (long)mdev->rs_mark_time[i]) / HZ; | |
2358 | if (!dt) | |
2359 | dt++; | |
2360 | db = mdev->rs_mark_left[i] - rs_left; | |
2361 | dbdt = Bit2KB(db/dt); | |
2362 | ||
daeda1cc | 2363 | if (dbdt > c_min_rate) |
0f0601f4 LE |
2364 | throttle = 1; |
2365 | } | |
2366 | return throttle; | |
2367 | } | |
2368 | ||
2369 | ||
4a76b161 | 2370 | static int receive_DataRequest(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 2371 | { |
4a76b161 | 2372 | struct drbd_conf *mdev; |
b411b363 | 2373 | sector_t sector; |
4a76b161 | 2374 | sector_t capacity; |
db830c46 | 2375 | struct drbd_peer_request *peer_req; |
b411b363 | 2376 | struct digest_info *di = NULL; |
b18b37be | 2377 | int size, verb; |
b411b363 | 2378 | unsigned int fault_type; |
e658983a | 2379 | struct p_block_req *p = pi->data; |
4a76b161 AG |
2380 | |
2381 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
2382 | if (!mdev) | |
2383 | return -EIO; | |
2384 | capacity = drbd_get_capacity(mdev->this_bdev); | |
b411b363 PR |
2385 | |
2386 | sector = be64_to_cpu(p->sector); | |
2387 | size = be32_to_cpu(p->blksize); | |
2388 | ||
c670a398 | 2389 | if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) { |
b411b363 PR |
2390 | dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, |
2391 | (unsigned long long)sector, size); | |
82bc0194 | 2392 | return -EINVAL; |
b411b363 PR |
2393 | } |
2394 | if (sector + (size>>9) > capacity) { | |
2395 | dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, | |
2396 | (unsigned long long)sector, size); | |
82bc0194 | 2397 | return -EINVAL; |
b411b363 PR |
2398 | } |
2399 | ||
2400 | if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) { | |
b18b37be | 2401 | verb = 1; |
e2857216 | 2402 | switch (pi->cmd) { |
b18b37be PR |
2403 | case P_DATA_REQUEST: |
2404 | drbd_send_ack_rp(mdev, P_NEG_DREPLY, p); | |
2405 | break; | |
2406 | case P_RS_DATA_REQUEST: | |
2407 | case P_CSUM_RS_REQUEST: | |
2408 | case P_OV_REQUEST: | |
2409 | drbd_send_ack_rp(mdev, P_NEG_RS_DREPLY , p); | |
2410 | break; | |
2411 | case P_OV_REPLY: | |
2412 | verb = 0; | |
2413 | dec_rs_pending(mdev); | |
2414 | drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, ID_IN_SYNC); | |
2415 | break; | |
2416 | default: | |
49ba9b1b | 2417 | BUG(); |
b18b37be PR |
2418 | } |
2419 | if (verb && __ratelimit(&drbd_ratelimit_state)) | |
b411b363 PR |
2420 | dev_err(DEV, "Can not satisfy peer's read request, " |
2421 | "no local data.\n"); | |
b18b37be | 2422 | |
a821cc4a | 2423 | /* drain possibly payload */ |
e2857216 | 2424 | return drbd_drain_block(mdev, pi->size); |
b411b363 PR |
2425 | } |
2426 | ||
2427 | /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD | |
2428 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
2429 | * which in turn might block on the other node at this very place. */ | |
0db55363 | 2430 | peer_req = drbd_alloc_peer_req(mdev, p->block_id, sector, size, GFP_NOIO); |
db830c46 | 2431 | if (!peer_req) { |
b411b363 | 2432 | put_ldev(mdev); |
82bc0194 | 2433 | return -ENOMEM; |
b411b363 PR |
2434 | } |
2435 | ||
e2857216 | 2436 | switch (pi->cmd) { |
b411b363 | 2437 | case P_DATA_REQUEST: |
db830c46 | 2438 | peer_req->w.cb = w_e_end_data_req; |
b411b363 | 2439 | fault_type = DRBD_FAULT_DT_RD; |
80a40e43 LE |
2440 | /* application IO, don't drbd_rs_begin_io */ |
2441 | goto submit; | |
2442 | ||
b411b363 | 2443 | case P_RS_DATA_REQUEST: |
db830c46 | 2444 | peer_req->w.cb = w_e_end_rsdata_req; |
b411b363 | 2445 | fault_type = DRBD_FAULT_RS_RD; |
5f9915bb LE |
2446 | /* used in the sector offset progress display */ |
2447 | mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); | |
b411b363 PR |
2448 | break; |
2449 | ||
2450 | case P_OV_REPLY: | |
2451 | case P_CSUM_RS_REQUEST: | |
2452 | fault_type = DRBD_FAULT_RS_RD; | |
e2857216 | 2453 | di = kmalloc(sizeof(*di) + pi->size, GFP_NOIO); |
b411b363 PR |
2454 | if (!di) |
2455 | goto out_free_e; | |
2456 | ||
e2857216 | 2457 | di->digest_size = pi->size; |
b411b363 PR |
2458 | di->digest = (((char *)di)+sizeof(struct digest_info)); |
2459 | ||
db830c46 AG |
2460 | peer_req->digest = di; |
2461 | peer_req->flags |= EE_HAS_DIGEST; | |
c36c3ced | 2462 | |
e2857216 | 2463 | if (drbd_recv_all(mdev->tconn, di->digest, pi->size)) |
b411b363 PR |
2464 | goto out_free_e; |
2465 | ||
e2857216 | 2466 | if (pi->cmd == P_CSUM_RS_REQUEST) { |
31890f4a | 2467 | D_ASSERT(mdev->tconn->agreed_pro_version >= 89); |
db830c46 | 2468 | peer_req->w.cb = w_e_end_csum_rs_req; |
5f9915bb LE |
2469 | /* used in the sector offset progress display */ |
2470 | mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); | |
e2857216 | 2471 | } else if (pi->cmd == P_OV_REPLY) { |
2649f080 LE |
2472 | /* track progress, we may need to throttle */ |
2473 | atomic_add(size >> 9, &mdev->rs_sect_in); | |
db830c46 | 2474 | peer_req->w.cb = w_e_end_ov_reply; |
b411b363 | 2475 | dec_rs_pending(mdev); |
0f0601f4 LE |
2476 | /* drbd_rs_begin_io done when we sent this request, |
2477 | * but accounting still needs to be done. */ | |
2478 | goto submit_for_resync; | |
b411b363 PR |
2479 | } |
2480 | break; | |
2481 | ||
2482 | case P_OV_REQUEST: | |
b411b363 | 2483 | if (mdev->ov_start_sector == ~(sector_t)0 && |
31890f4a | 2484 | mdev->tconn->agreed_pro_version >= 90) { |
de228bba LE |
2485 | unsigned long now = jiffies; |
2486 | int i; | |
b411b363 PR |
2487 | mdev->ov_start_sector = sector; |
2488 | mdev->ov_position = sector; | |
30b743a2 LE |
2489 | mdev->ov_left = drbd_bm_bits(mdev) - BM_SECT_TO_BIT(sector); |
2490 | mdev->rs_total = mdev->ov_left; | |
de228bba LE |
2491 | for (i = 0; i < DRBD_SYNC_MARKS; i++) { |
2492 | mdev->rs_mark_left[i] = mdev->ov_left; | |
2493 | mdev->rs_mark_time[i] = now; | |
2494 | } | |
b411b363 PR |
2495 | dev_info(DEV, "Online Verify start sector: %llu\n", |
2496 | (unsigned long long)sector); | |
2497 | } | |
db830c46 | 2498 | peer_req->w.cb = w_e_end_ov_req; |
b411b363 | 2499 | fault_type = DRBD_FAULT_RS_RD; |
b411b363 PR |
2500 | break; |
2501 | ||
b411b363 | 2502 | default: |
49ba9b1b | 2503 | BUG(); |
b411b363 PR |
2504 | } |
2505 | ||
0f0601f4 LE |
2506 | /* Throttle, drbd_rs_begin_io and submit should become asynchronous |
2507 | * wrt the receiver, but it is not as straightforward as it may seem. | |
2508 | * Various places in the resync start and stop logic assume resync | |
2509 | * requests are processed in order, requeuing this on the worker thread | |
2510 | * introduces a bunch of new code for synchronization between threads. | |
2511 | * | |
2512 | * Unlimited throttling before drbd_rs_begin_io may stall the resync | |
2513 | * "forever", throttling after drbd_rs_begin_io will lock that extent | |
2514 | * for application writes for the same time. For now, just throttle | |
2515 | * here, where the rest of the code expects the receiver to sleep for | |
2516 | * a while, anyways. | |
2517 | */ | |
2518 | ||
2519 | /* Throttle before drbd_rs_begin_io, as that locks out application IO; | |
2520 | * this defers syncer requests for some time, before letting at least | |
2521 | * on request through. The resync controller on the receiving side | |
2522 | * will adapt to the incoming rate accordingly. | |
2523 | * | |
2524 | * We cannot throttle here if remote is Primary/SyncTarget: | |
2525 | * we would also throttle its application reads. | |
2526 | * In that case, throttling is done on the SyncTarget only. | |
2527 | */ | |
e3555d85 PR |
2528 | if (mdev->state.peer != R_PRIMARY && drbd_rs_should_slow_down(mdev, sector)) |
2529 | schedule_timeout_uninterruptible(HZ/10); | |
2530 | if (drbd_rs_begin_io(mdev, sector)) | |
80a40e43 | 2531 | goto out_free_e; |
b411b363 | 2532 | |
0f0601f4 LE |
2533 | submit_for_resync: |
2534 | atomic_add(size >> 9, &mdev->rs_sect_ev); | |
2535 | ||
80a40e43 | 2536 | submit: |
b411b363 | 2537 | inc_unacked(mdev); |
87eeee41 | 2538 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 | 2539 | list_add_tail(&peer_req->w.list, &mdev->read_ee); |
87eeee41 | 2540 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 2541 | |
fbe29dec | 2542 | if (drbd_submit_peer_request(mdev, peer_req, READ, fault_type) == 0) |
82bc0194 | 2543 | return 0; |
b411b363 | 2544 | |
10f6d992 LE |
2545 | /* don't care for the reason here */ |
2546 | dev_err(DEV, "submit failed, triggering re-connect\n"); | |
87eeee41 | 2547 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 | 2548 | list_del(&peer_req->w.list); |
87eeee41 | 2549 | spin_unlock_irq(&mdev->tconn->req_lock); |
22cc37a9 LE |
2550 | /* no drbd_rs_complete_io(), we are dropping the connection anyways */ |
2551 | ||
b411b363 | 2552 | out_free_e: |
b411b363 | 2553 | put_ldev(mdev); |
3967deb1 | 2554 | drbd_free_peer_req(mdev, peer_req); |
82bc0194 | 2555 | return -EIO; |
b411b363 PR |
2556 | } |
2557 | ||
2558 | static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local) | |
2559 | { | |
2560 | int self, peer, rv = -100; | |
2561 | unsigned long ch_self, ch_peer; | |
44ed167d | 2562 | enum drbd_after_sb_p after_sb_0p; |
b411b363 PR |
2563 | |
2564 | self = mdev->ldev->md.uuid[UI_BITMAP] & 1; | |
2565 | peer = mdev->p_uuid[UI_BITMAP] & 1; | |
2566 | ||
2567 | ch_peer = mdev->p_uuid[UI_SIZE]; | |
2568 | ch_self = mdev->comm_bm_set; | |
2569 | ||
44ed167d PR |
2570 | rcu_read_lock(); |
2571 | after_sb_0p = rcu_dereference(mdev->tconn->net_conf)->after_sb_0p; | |
2572 | rcu_read_unlock(); | |
2573 | switch (after_sb_0p) { | |
b411b363 PR |
2574 | case ASB_CONSENSUS: |
2575 | case ASB_DISCARD_SECONDARY: | |
2576 | case ASB_CALL_HELPER: | |
44ed167d | 2577 | case ASB_VIOLENTLY: |
b411b363 PR |
2578 | dev_err(DEV, "Configuration error.\n"); |
2579 | break; | |
2580 | case ASB_DISCONNECT: | |
2581 | break; | |
2582 | case ASB_DISCARD_YOUNGER_PRI: | |
2583 | if (self == 0 && peer == 1) { | |
2584 | rv = -1; | |
2585 | break; | |
2586 | } | |
2587 | if (self == 1 && peer == 0) { | |
2588 | rv = 1; | |
2589 | break; | |
2590 | } | |
2591 | /* Else fall through to one of the other strategies... */ | |
2592 | case ASB_DISCARD_OLDER_PRI: | |
2593 | if (self == 0 && peer == 1) { | |
2594 | rv = 1; | |
2595 | break; | |
2596 | } | |
2597 | if (self == 1 && peer == 0) { | |
2598 | rv = -1; | |
2599 | break; | |
2600 | } | |
2601 | /* Else fall through to one of the other strategies... */ | |
ad19bf6e | 2602 | dev_warn(DEV, "Discard younger/older primary did not find a decision\n" |
b411b363 PR |
2603 | "Using discard-least-changes instead\n"); |
2604 | case ASB_DISCARD_ZERO_CHG: | |
2605 | if (ch_peer == 0 && ch_self == 0) { | |
25703f83 | 2606 | rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) |
b411b363 PR |
2607 | ? -1 : 1; |
2608 | break; | |
2609 | } else { | |
2610 | if (ch_peer == 0) { rv = 1; break; } | |
2611 | if (ch_self == 0) { rv = -1; break; } | |
2612 | } | |
44ed167d | 2613 | if (after_sb_0p == ASB_DISCARD_ZERO_CHG) |
b411b363 PR |
2614 | break; |
2615 | case ASB_DISCARD_LEAST_CHG: | |
2616 | if (ch_self < ch_peer) | |
2617 | rv = -1; | |
2618 | else if (ch_self > ch_peer) | |
2619 | rv = 1; | |
2620 | else /* ( ch_self == ch_peer ) */ | |
2621 | /* Well, then use something else. */ | |
25703f83 | 2622 | rv = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) |
b411b363 PR |
2623 | ? -1 : 1; |
2624 | break; | |
2625 | case ASB_DISCARD_LOCAL: | |
2626 | rv = -1; | |
2627 | break; | |
2628 | case ASB_DISCARD_REMOTE: | |
2629 | rv = 1; | |
2630 | } | |
2631 | ||
2632 | return rv; | |
2633 | } | |
2634 | ||
2635 | static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local) | |
2636 | { | |
6184ea21 | 2637 | int hg, rv = -100; |
44ed167d | 2638 | enum drbd_after_sb_p after_sb_1p; |
b411b363 | 2639 | |
44ed167d PR |
2640 | rcu_read_lock(); |
2641 | after_sb_1p = rcu_dereference(mdev->tconn->net_conf)->after_sb_1p; | |
2642 | rcu_read_unlock(); | |
2643 | switch (after_sb_1p) { | |
b411b363 PR |
2644 | case ASB_DISCARD_YOUNGER_PRI: |
2645 | case ASB_DISCARD_OLDER_PRI: | |
2646 | case ASB_DISCARD_LEAST_CHG: | |
2647 | case ASB_DISCARD_LOCAL: | |
2648 | case ASB_DISCARD_REMOTE: | |
44ed167d | 2649 | case ASB_DISCARD_ZERO_CHG: |
b411b363 PR |
2650 | dev_err(DEV, "Configuration error.\n"); |
2651 | break; | |
2652 | case ASB_DISCONNECT: | |
2653 | break; | |
2654 | case ASB_CONSENSUS: | |
2655 | hg = drbd_asb_recover_0p(mdev); | |
2656 | if (hg == -1 && mdev->state.role == R_SECONDARY) | |
2657 | rv = hg; | |
2658 | if (hg == 1 && mdev->state.role == R_PRIMARY) | |
2659 | rv = hg; | |
2660 | break; | |
2661 | case ASB_VIOLENTLY: | |
2662 | rv = drbd_asb_recover_0p(mdev); | |
2663 | break; | |
2664 | case ASB_DISCARD_SECONDARY: | |
2665 | return mdev->state.role == R_PRIMARY ? 1 : -1; | |
2666 | case ASB_CALL_HELPER: | |
2667 | hg = drbd_asb_recover_0p(mdev); | |
2668 | if (hg == -1 && mdev->state.role == R_PRIMARY) { | |
bb437946 AG |
2669 | enum drbd_state_rv rv2; |
2670 | ||
2671 | drbd_set_role(mdev, R_SECONDARY, 0); | |
b411b363 PR |
2672 | /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, |
2673 | * we might be here in C_WF_REPORT_PARAMS which is transient. | |
2674 | * we do not need to wait for the after state change work either. */ | |
bb437946 AG |
2675 | rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); |
2676 | if (rv2 != SS_SUCCESS) { | |
b411b363 PR |
2677 | drbd_khelper(mdev, "pri-lost-after-sb"); |
2678 | } else { | |
2679 | dev_warn(DEV, "Successfully gave up primary role.\n"); | |
2680 | rv = hg; | |
2681 | } | |
2682 | } else | |
2683 | rv = hg; | |
2684 | } | |
2685 | ||
2686 | return rv; | |
2687 | } | |
2688 | ||
2689 | static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local) | |
2690 | { | |
6184ea21 | 2691 | int hg, rv = -100; |
44ed167d | 2692 | enum drbd_after_sb_p after_sb_2p; |
b411b363 | 2693 | |
44ed167d PR |
2694 | rcu_read_lock(); |
2695 | after_sb_2p = rcu_dereference(mdev->tconn->net_conf)->after_sb_2p; | |
2696 | rcu_read_unlock(); | |
2697 | switch (after_sb_2p) { | |
b411b363 PR |
2698 | case ASB_DISCARD_YOUNGER_PRI: |
2699 | case ASB_DISCARD_OLDER_PRI: | |
2700 | case ASB_DISCARD_LEAST_CHG: | |
2701 | case ASB_DISCARD_LOCAL: | |
2702 | case ASB_DISCARD_REMOTE: | |
2703 | case ASB_CONSENSUS: | |
2704 | case ASB_DISCARD_SECONDARY: | |
44ed167d | 2705 | case ASB_DISCARD_ZERO_CHG: |
b411b363 PR |
2706 | dev_err(DEV, "Configuration error.\n"); |
2707 | break; | |
2708 | case ASB_VIOLENTLY: | |
2709 | rv = drbd_asb_recover_0p(mdev); | |
2710 | break; | |
2711 | case ASB_DISCONNECT: | |
2712 | break; | |
2713 | case ASB_CALL_HELPER: | |
2714 | hg = drbd_asb_recover_0p(mdev); | |
2715 | if (hg == -1) { | |
bb437946 AG |
2716 | enum drbd_state_rv rv2; |
2717 | ||
b411b363 PR |
2718 | /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, |
2719 | * we might be here in C_WF_REPORT_PARAMS which is transient. | |
2720 | * we do not need to wait for the after state change work either. */ | |
bb437946 AG |
2721 | rv2 = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY)); |
2722 | if (rv2 != SS_SUCCESS) { | |
b411b363 PR |
2723 | drbd_khelper(mdev, "pri-lost-after-sb"); |
2724 | } else { | |
2725 | dev_warn(DEV, "Successfully gave up primary role.\n"); | |
2726 | rv = hg; | |
2727 | } | |
2728 | } else | |
2729 | rv = hg; | |
2730 | } | |
2731 | ||
2732 | return rv; | |
2733 | } | |
2734 | ||
2735 | static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid, | |
2736 | u64 bits, u64 flags) | |
2737 | { | |
2738 | if (!uuid) { | |
2739 | dev_info(DEV, "%s uuid info vanished while I was looking!\n", text); | |
2740 | return; | |
2741 | } | |
2742 | dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", | |
2743 | text, | |
2744 | (unsigned long long)uuid[UI_CURRENT], | |
2745 | (unsigned long long)uuid[UI_BITMAP], | |
2746 | (unsigned long long)uuid[UI_HISTORY_START], | |
2747 | (unsigned long long)uuid[UI_HISTORY_END], | |
2748 | (unsigned long long)bits, | |
2749 | (unsigned long long)flags); | |
2750 | } | |
2751 | ||
2752 | /* | |
2753 | 100 after split brain try auto recover | |
2754 | 2 C_SYNC_SOURCE set BitMap | |
2755 | 1 C_SYNC_SOURCE use BitMap | |
2756 | 0 no Sync | |
2757 | -1 C_SYNC_TARGET use BitMap | |
2758 | -2 C_SYNC_TARGET set BitMap | |
2759 | -100 after split brain, disconnect | |
2760 | -1000 unrelated data | |
4a23f264 PR |
2761 | -1091 requires proto 91 |
2762 | -1096 requires proto 96 | |
b411b363 PR |
2763 | */ |
2764 | static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local) | |
2765 | { | |
2766 | u64 self, peer; | |
2767 | int i, j; | |
2768 | ||
2769 | self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); | |
2770 | peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); | |
2771 | ||
2772 | *rule_nr = 10; | |
2773 | if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) | |
2774 | return 0; | |
2775 | ||
2776 | *rule_nr = 20; | |
2777 | if ((self == UUID_JUST_CREATED || self == (u64)0) && | |
2778 | peer != UUID_JUST_CREATED) | |
2779 | return -2; | |
2780 | ||
2781 | *rule_nr = 30; | |
2782 | if (self != UUID_JUST_CREATED && | |
2783 | (peer == UUID_JUST_CREATED || peer == (u64)0)) | |
2784 | return 2; | |
2785 | ||
2786 | if (self == peer) { | |
2787 | int rct, dc; /* roles at crash time */ | |
2788 | ||
2789 | if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) { | |
2790 | ||
31890f4a | 2791 | if (mdev->tconn->agreed_pro_version < 91) |
4a23f264 | 2792 | return -1091; |
b411b363 PR |
2793 | |
2794 | if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) && | |
2795 | (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { | |
2796 | dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n"); | |
2797 | drbd_uuid_set_bm(mdev, 0UL); | |
2798 | ||
2799 | drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, | |
2800 | mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); | |
2801 | *rule_nr = 34; | |
2802 | } else { | |
2803 | dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n"); | |
2804 | *rule_nr = 36; | |
2805 | } | |
2806 | ||
2807 | return 1; | |
2808 | } | |
2809 | ||
2810 | if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) { | |
2811 | ||
31890f4a | 2812 | if (mdev->tconn->agreed_pro_version < 91) |
4a23f264 | 2813 | return -1091; |
b411b363 PR |
2814 | |
2815 | if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) && | |
2816 | (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) { | |
2817 | dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); | |
2818 | ||
2819 | mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START]; | |
2820 | mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP]; | |
2821 | mdev->p_uuid[UI_BITMAP] = 0UL; | |
2822 | ||
2823 | drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); | |
2824 | *rule_nr = 35; | |
2825 | } else { | |
2826 | dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n"); | |
2827 | *rule_nr = 37; | |
2828 | } | |
2829 | ||
2830 | return -1; | |
2831 | } | |
2832 | ||
2833 | /* Common power [off|failure] */ | |
2834 | rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) + | |
2835 | (mdev->p_uuid[UI_FLAGS] & 2); | |
2836 | /* lowest bit is set when we were primary, | |
2837 | * next bit (weight 2) is set when peer was primary */ | |
2838 | *rule_nr = 40; | |
2839 | ||
2840 | switch (rct) { | |
2841 | case 0: /* !self_pri && !peer_pri */ return 0; | |
2842 | case 1: /* self_pri && !peer_pri */ return 1; | |
2843 | case 2: /* !self_pri && peer_pri */ return -1; | |
2844 | case 3: /* self_pri && peer_pri */ | |
25703f83 | 2845 | dc = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags); |
b411b363 PR |
2846 | return dc ? -1 : 1; |
2847 | } | |
2848 | } | |
2849 | ||
2850 | *rule_nr = 50; | |
2851 | peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); | |
2852 | if (self == peer) | |
2853 | return -1; | |
2854 | ||
2855 | *rule_nr = 51; | |
2856 | peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1); | |
2857 | if (self == peer) { | |
31890f4a | 2858 | if (mdev->tconn->agreed_pro_version < 96 ? |
4a23f264 PR |
2859 | (mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == |
2860 | (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) : | |
2861 | peer + UUID_NEW_BM_OFFSET == (mdev->p_uuid[UI_BITMAP] & ~((u64)1))) { | |
b411b363 PR |
2862 | /* The last P_SYNC_UUID did not get though. Undo the last start of |
2863 | resync as sync source modifications of the peer's UUIDs. */ | |
2864 | ||
31890f4a | 2865 | if (mdev->tconn->agreed_pro_version < 91) |
4a23f264 | 2866 | return -1091; |
b411b363 PR |
2867 | |
2868 | mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START]; | |
2869 | mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1]; | |
4a23f264 | 2870 | |
1882e22d | 2871 | dev_info(DEV, "Lost last syncUUID packet, corrected:\n"); |
4a23f264 PR |
2872 | drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); |
2873 | ||
b411b363 PR |
2874 | return -1; |
2875 | } | |
2876 | } | |
2877 | ||
2878 | *rule_nr = 60; | |
2879 | self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1); | |
2880 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { | |
2881 | peer = mdev->p_uuid[i] & ~((u64)1); | |
2882 | if (self == peer) | |
2883 | return -2; | |
2884 | } | |
2885 | ||
2886 | *rule_nr = 70; | |
2887 | self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); | |
2888 | peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); | |
2889 | if (self == peer) | |
2890 | return 1; | |
2891 | ||
2892 | *rule_nr = 71; | |
2893 | self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); | |
2894 | if (self == peer) { | |
31890f4a | 2895 | if (mdev->tconn->agreed_pro_version < 96 ? |
4a23f264 PR |
2896 | (mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == |
2897 | (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) : | |
2898 | self + UUID_NEW_BM_OFFSET == (mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) { | |
b411b363 PR |
2899 | /* The last P_SYNC_UUID did not get though. Undo the last start of |
2900 | resync as sync source modifications of our UUIDs. */ | |
2901 | ||
31890f4a | 2902 | if (mdev->tconn->agreed_pro_version < 91) |
4a23f264 | 2903 | return -1091; |
b411b363 PR |
2904 | |
2905 | _drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]); | |
2906 | _drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]); | |
2907 | ||
4a23f264 | 2908 | dev_info(DEV, "Last syncUUID did not get through, corrected:\n"); |
b411b363 PR |
2909 | drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, |
2910 | mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0); | |
2911 | ||
2912 | return 1; | |
2913 | } | |
2914 | } | |
2915 | ||
2916 | ||
2917 | *rule_nr = 80; | |
d8c2a36b | 2918 | peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1); |
b411b363 PR |
2919 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { |
2920 | self = mdev->ldev->md.uuid[i] & ~((u64)1); | |
2921 | if (self == peer) | |
2922 | return 2; | |
2923 | } | |
2924 | ||
2925 | *rule_nr = 90; | |
2926 | self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1); | |
2927 | peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1); | |
2928 | if (self == peer && self != ((u64)0)) | |
2929 | return 100; | |
2930 | ||
2931 | *rule_nr = 100; | |
2932 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { | |
2933 | self = mdev->ldev->md.uuid[i] & ~((u64)1); | |
2934 | for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { | |
2935 | peer = mdev->p_uuid[j] & ~((u64)1); | |
2936 | if (self == peer) | |
2937 | return -100; | |
2938 | } | |
2939 | } | |
2940 | ||
2941 | return -1000; | |
2942 | } | |
2943 | ||
2944 | /* drbd_sync_handshake() returns the new conn state on success, or | |
2945 | CONN_MASK (-1) on failure. | |
2946 | */ | |
2947 | static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role, | |
2948 | enum drbd_disk_state peer_disk) __must_hold(local) | |
2949 | { | |
b411b363 PR |
2950 | enum drbd_conns rv = C_MASK; |
2951 | enum drbd_disk_state mydisk; | |
44ed167d | 2952 | struct net_conf *nc; |
6dff2902 | 2953 | int hg, rule_nr, rr_conflict, tentative; |
b411b363 PR |
2954 | |
2955 | mydisk = mdev->state.disk; | |
2956 | if (mydisk == D_NEGOTIATING) | |
2957 | mydisk = mdev->new_state_tmp.disk; | |
2958 | ||
2959 | dev_info(DEV, "drbd_sync_handshake:\n"); | |
2960 | drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0); | |
2961 | drbd_uuid_dump(mdev, "peer", mdev->p_uuid, | |
2962 | mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]); | |
2963 | ||
2964 | hg = drbd_uuid_compare(mdev, &rule_nr); | |
2965 | ||
2966 | dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr); | |
2967 | ||
2968 | if (hg == -1000) { | |
2969 | dev_alert(DEV, "Unrelated data, aborting!\n"); | |
2970 | return C_MASK; | |
2971 | } | |
4a23f264 PR |
2972 | if (hg < -1000) { |
2973 | dev_alert(DEV, "To resolve this both sides have to support at least protocol %d\n", -hg - 1000); | |
b411b363 PR |
2974 | return C_MASK; |
2975 | } | |
2976 | ||
2977 | if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || | |
2978 | (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { | |
2979 | int f = (hg == -100) || abs(hg) == 2; | |
2980 | hg = mydisk > D_INCONSISTENT ? 1 : -1; | |
2981 | if (f) | |
2982 | hg = hg*2; | |
2983 | dev_info(DEV, "Becoming sync %s due to disk states.\n", | |
2984 | hg > 0 ? "source" : "target"); | |
2985 | } | |
2986 | ||
3a11a487 AG |
2987 | if (abs(hg) == 100) |
2988 | drbd_khelper(mdev, "initial-split-brain"); | |
2989 | ||
44ed167d PR |
2990 | rcu_read_lock(); |
2991 | nc = rcu_dereference(mdev->tconn->net_conf); | |
2992 | ||
2993 | if (hg == 100 || (hg == -100 && nc->always_asbp)) { | |
b411b363 PR |
2994 | int pcount = (mdev->state.role == R_PRIMARY) |
2995 | + (peer_role == R_PRIMARY); | |
2996 | int forced = (hg == -100); | |
2997 | ||
2998 | switch (pcount) { | |
2999 | case 0: | |
3000 | hg = drbd_asb_recover_0p(mdev); | |
3001 | break; | |
3002 | case 1: | |
3003 | hg = drbd_asb_recover_1p(mdev); | |
3004 | break; | |
3005 | case 2: | |
3006 | hg = drbd_asb_recover_2p(mdev); | |
3007 | break; | |
3008 | } | |
3009 | if (abs(hg) < 100) { | |
3010 | dev_warn(DEV, "Split-Brain detected, %d primaries, " | |
3011 | "automatically solved. Sync from %s node\n", | |
3012 | pcount, (hg < 0) ? "peer" : "this"); | |
3013 | if (forced) { | |
3014 | dev_warn(DEV, "Doing a full sync, since" | |
3015 | " UUIDs where ambiguous.\n"); | |
3016 | hg = hg*2; | |
3017 | } | |
3018 | } | |
3019 | } | |
3020 | ||
3021 | if (hg == -100) { | |
08b165ba | 3022 | if (test_bit(DISCARD_MY_DATA, &mdev->flags) && !(mdev->p_uuid[UI_FLAGS]&1)) |
b411b363 | 3023 | hg = -1; |
08b165ba | 3024 | if (!test_bit(DISCARD_MY_DATA, &mdev->flags) && (mdev->p_uuid[UI_FLAGS]&1)) |
b411b363 PR |
3025 | hg = 1; |
3026 | ||
3027 | if (abs(hg) < 100) | |
3028 | dev_warn(DEV, "Split-Brain detected, manually solved. " | |
3029 | "Sync from %s node\n", | |
3030 | (hg < 0) ? "peer" : "this"); | |
3031 | } | |
44ed167d | 3032 | rr_conflict = nc->rr_conflict; |
6dff2902 | 3033 | tentative = nc->tentative; |
44ed167d | 3034 | rcu_read_unlock(); |
b411b363 PR |
3035 | |
3036 | if (hg == -100) { | |
580b9767 LE |
3037 | /* FIXME this log message is not correct if we end up here |
3038 | * after an attempted attach on a diskless node. | |
3039 | * We just refuse to attach -- well, we drop the "connection" | |
3040 | * to that disk, in a way... */ | |
3a11a487 | 3041 | dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n"); |
b411b363 PR |
3042 | drbd_khelper(mdev, "split-brain"); |
3043 | return C_MASK; | |
3044 | } | |
3045 | ||
3046 | if (hg > 0 && mydisk <= D_INCONSISTENT) { | |
3047 | dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n"); | |
3048 | return C_MASK; | |
3049 | } | |
3050 | ||
3051 | if (hg < 0 && /* by intention we do not use mydisk here. */ | |
3052 | mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) { | |
44ed167d | 3053 | switch (rr_conflict) { |
b411b363 PR |
3054 | case ASB_CALL_HELPER: |
3055 | drbd_khelper(mdev, "pri-lost"); | |
3056 | /* fall through */ | |
3057 | case ASB_DISCONNECT: | |
3058 | dev_err(DEV, "I shall become SyncTarget, but I am primary!\n"); | |
3059 | return C_MASK; | |
3060 | case ASB_VIOLENTLY: | |
3061 | dev_warn(DEV, "Becoming SyncTarget, violating the stable-data" | |
3062 | "assumption\n"); | |
3063 | } | |
3064 | } | |
3065 | ||
6dff2902 | 3066 | if (tentative || test_bit(CONN_DRY_RUN, &mdev->tconn->flags)) { |
cf14c2e9 PR |
3067 | if (hg == 0) |
3068 | dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n"); | |
3069 | else | |
3070 | dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.", | |
3071 | drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), | |
3072 | abs(hg) >= 2 ? "full" : "bit-map based"); | |
3073 | return C_MASK; | |
3074 | } | |
3075 | ||
b411b363 PR |
3076 | if (abs(hg) >= 2) { |
3077 | dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); | |
20ceb2b2 LE |
3078 | if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake", |
3079 | BM_LOCKED_SET_ALLOWED)) | |
b411b363 PR |
3080 | return C_MASK; |
3081 | } | |
3082 | ||
3083 | if (hg > 0) { /* become sync source. */ | |
3084 | rv = C_WF_BITMAP_S; | |
3085 | } else if (hg < 0) { /* become sync target */ | |
3086 | rv = C_WF_BITMAP_T; | |
3087 | } else { | |
3088 | rv = C_CONNECTED; | |
3089 | if (drbd_bm_total_weight(mdev)) { | |
3090 | dev_info(DEV, "No resync, but %lu bits in bitmap!\n", | |
3091 | drbd_bm_total_weight(mdev)); | |
3092 | } | |
3093 | } | |
3094 | ||
3095 | return rv; | |
3096 | } | |
3097 | ||
f179d76d | 3098 | static enum drbd_after_sb_p convert_after_sb(enum drbd_after_sb_p peer) |
b411b363 PR |
3099 | { |
3100 | /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ | |
f179d76d PR |
3101 | if (peer == ASB_DISCARD_REMOTE) |
3102 | return ASB_DISCARD_LOCAL; | |
b411b363 PR |
3103 | |
3104 | /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ | |
f179d76d PR |
3105 | if (peer == ASB_DISCARD_LOCAL) |
3106 | return ASB_DISCARD_REMOTE; | |
b411b363 PR |
3107 | |
3108 | /* everything else is valid if they are equal on both sides. */ | |
f179d76d | 3109 | return peer; |
b411b363 PR |
3110 | } |
3111 | ||
e2857216 | 3112 | static int receive_protocol(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 3113 | { |
e658983a | 3114 | struct p_protocol *p = pi->data; |
036b17ea PR |
3115 | enum drbd_after_sb_p p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; |
3116 | int p_proto, p_discard_my_data, p_two_primaries, cf; | |
3117 | struct net_conf *nc, *old_net_conf, *new_net_conf = NULL; | |
3118 | char integrity_alg[SHARED_SECRET_MAX] = ""; | |
accdbcc5 | 3119 | struct crypto_hash *peer_integrity_tfm = NULL; |
7aca6c75 | 3120 | void *int_dig_in = NULL, *int_dig_vv = NULL; |
b411b363 | 3121 | |
b411b363 PR |
3122 | p_proto = be32_to_cpu(p->protocol); |
3123 | p_after_sb_0p = be32_to_cpu(p->after_sb_0p); | |
3124 | p_after_sb_1p = be32_to_cpu(p->after_sb_1p); | |
3125 | p_after_sb_2p = be32_to_cpu(p->after_sb_2p); | |
b411b363 | 3126 | p_two_primaries = be32_to_cpu(p->two_primaries); |
cf14c2e9 | 3127 | cf = be32_to_cpu(p->conn_flags); |
6139f60d | 3128 | p_discard_my_data = cf & CF_DISCARD_MY_DATA; |
cf14c2e9 | 3129 | |
86db0618 AG |
3130 | if (tconn->agreed_pro_version >= 87) { |
3131 | int err; | |
3132 | ||
88104ca4 | 3133 | if (pi->size > sizeof(integrity_alg)) |
86db0618 | 3134 | return -EIO; |
88104ca4 | 3135 | err = drbd_recv_all(tconn, integrity_alg, pi->size); |
86db0618 AG |
3136 | if (err) |
3137 | return err; | |
036b17ea PR |
3138 | integrity_alg[SHARED_SECRET_MAX - 1] = 0; |
3139 | } | |
88104ca4 | 3140 | |
7d4c782c | 3141 | if (pi->cmd != P_PROTOCOL_UPDATE) { |
fbc12f45 | 3142 | clear_bit(CONN_DRY_RUN, &tconn->flags); |
036b17ea | 3143 | |
fbc12f45 AG |
3144 | if (cf & CF_DRY_RUN) |
3145 | set_bit(CONN_DRY_RUN, &tconn->flags); | |
cf14c2e9 | 3146 | |
fbc12f45 AG |
3147 | rcu_read_lock(); |
3148 | nc = rcu_dereference(tconn->net_conf); | |
b411b363 | 3149 | |
fbc12f45 | 3150 | if (p_proto != nc->wire_protocol) { |
d505d9be | 3151 | conn_err(tconn, "incompatible %s settings\n", "protocol"); |
fbc12f45 AG |
3152 | goto disconnect_rcu_unlock; |
3153 | } | |
44ed167d | 3154 | |
fbc12f45 | 3155 | if (convert_after_sb(p_after_sb_0p) != nc->after_sb_0p) { |
d505d9be | 3156 | conn_err(tconn, "incompatible %s settings\n", "after-sb-0pri"); |
fbc12f45 AG |
3157 | goto disconnect_rcu_unlock; |
3158 | } | |
b411b363 | 3159 | |
fbc12f45 | 3160 | if (convert_after_sb(p_after_sb_1p) != nc->after_sb_1p) { |
d505d9be | 3161 | conn_err(tconn, "incompatible %s settings\n", "after-sb-1pri"); |
fbc12f45 AG |
3162 | goto disconnect_rcu_unlock; |
3163 | } | |
b411b363 | 3164 | |
fbc12f45 | 3165 | if (convert_after_sb(p_after_sb_2p) != nc->after_sb_2p) { |
d505d9be | 3166 | conn_err(tconn, "incompatible %s settings\n", "after-sb-2pri"); |
fbc12f45 AG |
3167 | goto disconnect_rcu_unlock; |
3168 | } | |
b411b363 | 3169 | |
fbc12f45 | 3170 | if (p_discard_my_data && nc->discard_my_data) { |
d505d9be | 3171 | conn_err(tconn, "incompatible %s settings\n", "discard-my-data"); |
fbc12f45 AG |
3172 | goto disconnect_rcu_unlock; |
3173 | } | |
b411b363 | 3174 | |
fbc12f45 | 3175 | if (p_two_primaries != nc->two_primaries) { |
d505d9be | 3176 | conn_err(tconn, "incompatible %s settings\n", "allow-two-primaries"); |
fbc12f45 AG |
3177 | goto disconnect_rcu_unlock; |
3178 | } | |
b411b363 | 3179 | |
fbc12f45 | 3180 | if (strcmp(integrity_alg, nc->integrity_alg)) { |
d505d9be | 3181 | conn_err(tconn, "incompatible %s settings\n", "data-integrity-alg"); |
fbc12f45 AG |
3182 | goto disconnect_rcu_unlock; |
3183 | } | |
b411b363 | 3184 | |
fbc12f45 | 3185 | rcu_read_unlock(); |
036b17ea | 3186 | } |
7d4c782c AG |
3187 | |
3188 | if (integrity_alg[0]) { | |
3189 | int hash_size; | |
3190 | ||
3191 | /* | |
3192 | * We can only change the peer data integrity algorithm | |
3193 | * here. Changing our own data integrity algorithm | |
3194 | * requires that we send a P_PROTOCOL_UPDATE packet at | |
3195 | * the same time; otherwise, the peer has no way to | |
3196 | * tell between which packets the algorithm should | |
3197 | * change. | |
3198 | */ | |
3199 | ||
3200 | peer_integrity_tfm = crypto_alloc_hash(integrity_alg, 0, CRYPTO_ALG_ASYNC); | |
3201 | if (!peer_integrity_tfm) { | |
3202 | conn_err(tconn, "peer data-integrity-alg %s not supported\n", | |
3203 | integrity_alg); | |
3204 | goto disconnect; | |
3205 | } | |
3206 | ||
3207 | hash_size = crypto_hash_digestsize(peer_integrity_tfm); | |
3208 | int_dig_in = kmalloc(hash_size, GFP_KERNEL); | |
3209 | int_dig_vv = kmalloc(hash_size, GFP_KERNEL); | |
3210 | if (!(int_dig_in && int_dig_vv)) { | |
3211 | conn_err(tconn, "Allocation of buffers for data integrity checking failed\n"); | |
3212 | goto disconnect; | |
3213 | } | |
3214 | } | |
3215 | ||
3216 | new_net_conf = kmalloc(sizeof(struct net_conf), GFP_KERNEL); | |
3217 | if (!new_net_conf) { | |
3218 | conn_err(tconn, "Allocation of new net_conf failed\n"); | |
3219 | goto disconnect; | |
3220 | } | |
3221 | ||
3222 | mutex_lock(&tconn->data.mutex); | |
3223 | mutex_lock(&tconn->conf_update); | |
3224 | old_net_conf = tconn->net_conf; | |
3225 | *new_net_conf = *old_net_conf; | |
3226 | ||
3227 | new_net_conf->wire_protocol = p_proto; | |
3228 | new_net_conf->after_sb_0p = convert_after_sb(p_after_sb_0p); | |
3229 | new_net_conf->after_sb_1p = convert_after_sb(p_after_sb_1p); | |
3230 | new_net_conf->after_sb_2p = convert_after_sb(p_after_sb_2p); | |
3231 | new_net_conf->two_primaries = p_two_primaries; | |
3232 | ||
3233 | rcu_assign_pointer(tconn->net_conf, new_net_conf); | |
3234 | mutex_unlock(&tconn->conf_update); | |
3235 | mutex_unlock(&tconn->data.mutex); | |
3236 | ||
3237 | crypto_free_hash(tconn->peer_integrity_tfm); | |
3238 | kfree(tconn->int_dig_in); | |
3239 | kfree(tconn->int_dig_vv); | |
3240 | tconn->peer_integrity_tfm = peer_integrity_tfm; | |
3241 | tconn->int_dig_in = int_dig_in; | |
3242 | tconn->int_dig_vv = int_dig_vv; | |
3243 | ||
3244 | if (strcmp(old_net_conf->integrity_alg, integrity_alg)) | |
3245 | conn_info(tconn, "peer data-integrity-alg: %s\n", | |
3246 | integrity_alg[0] ? integrity_alg : "(none)"); | |
3247 | ||
3248 | synchronize_rcu(); | |
3249 | kfree(old_net_conf); | |
82bc0194 | 3250 | return 0; |
b411b363 | 3251 | |
44ed167d PR |
3252 | disconnect_rcu_unlock: |
3253 | rcu_read_unlock(); | |
b411b363 | 3254 | disconnect: |
b792c35c | 3255 | crypto_free_hash(peer_integrity_tfm); |
036b17ea PR |
3256 | kfree(int_dig_in); |
3257 | kfree(int_dig_vv); | |
7204624c | 3258 | conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 3259 | return -EIO; |
b411b363 PR |
3260 | } |
3261 | ||
3262 | /* helper function | |
3263 | * input: alg name, feature name | |
3264 | * return: NULL (alg name was "") | |
3265 | * ERR_PTR(error) if something goes wrong | |
3266 | * or the crypto hash ptr, if it worked out ok. */ | |
3267 | struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev, | |
3268 | const char *alg, const char *name) | |
3269 | { | |
3270 | struct crypto_hash *tfm; | |
3271 | ||
3272 | if (!alg[0]) | |
3273 | return NULL; | |
3274 | ||
3275 | tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC); | |
3276 | if (IS_ERR(tfm)) { | |
3277 | dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n", | |
3278 | alg, name, PTR_ERR(tfm)); | |
3279 | return tfm; | |
3280 | } | |
b411b363 PR |
3281 | return tfm; |
3282 | } | |
3283 | ||
4a76b161 AG |
3284 | static int ignore_remaining_packet(struct drbd_tconn *tconn, struct packet_info *pi) |
3285 | { | |
3286 | void *buffer = tconn->data.rbuf; | |
3287 | int size = pi->size; | |
3288 | ||
3289 | while (size) { | |
3290 | int s = min_t(int, size, DRBD_SOCKET_BUFFER_SIZE); | |
3291 | s = drbd_recv(tconn, buffer, s); | |
3292 | if (s <= 0) { | |
3293 | if (s < 0) | |
3294 | return s; | |
3295 | break; | |
3296 | } | |
3297 | size -= s; | |
3298 | } | |
3299 | if (size) | |
3300 | return -EIO; | |
3301 | return 0; | |
3302 | } | |
3303 | ||
3304 | /* | |
3305 | * config_unknown_volume - device configuration command for unknown volume | |
3306 | * | |
3307 | * When a device is added to an existing connection, the node on which the | |
3308 | * device is added first will send configuration commands to its peer but the | |
3309 | * peer will not know about the device yet. It will warn and ignore these | |
3310 | * commands. Once the device is added on the second node, the second node will | |
3311 | * send the same device configuration commands, but in the other direction. | |
3312 | * | |
3313 | * (We can also end up here if drbd is misconfigured.) | |
3314 | */ | |
3315 | static int config_unknown_volume(struct drbd_tconn *tconn, struct packet_info *pi) | |
3316 | { | |
2fcb8f30 AG |
3317 | conn_warn(tconn, "%s packet received for volume %u, which is not configured locally\n", |
3318 | cmdname(pi->cmd), pi->vnr); | |
4a76b161 AG |
3319 | return ignore_remaining_packet(tconn, pi); |
3320 | } | |
3321 | ||
3322 | static int receive_SyncParam(struct drbd_tconn *tconn, struct packet_info *pi) | |
b411b363 | 3323 | { |
4a76b161 | 3324 | struct drbd_conf *mdev; |
e658983a | 3325 | struct p_rs_param_95 *p; |
b411b363 PR |
3326 | unsigned int header_size, data_size, exp_max_sz; |
3327 | struct crypto_hash *verify_tfm = NULL; | |
3328 | struct crypto_hash *csums_tfm = NULL; | |
2ec91e0e | 3329 | struct net_conf *old_net_conf, *new_net_conf = NULL; |
813472ce | 3330 | struct disk_conf *old_disk_conf = NULL, *new_disk_conf = NULL; |
4a76b161 | 3331 | const int apv = tconn->agreed_pro_version; |
813472ce | 3332 | struct fifo_buffer *old_plan = NULL, *new_plan = NULL; |
778f271d | 3333 | int fifo_size = 0; |
82bc0194 | 3334 | int err; |
b411b363 | 3335 | |
4a76b161 AG |
3336 | mdev = vnr_to_mdev(tconn, pi->vnr); |
3337 | if (!mdev) | |
3338 | return config_unknown_volume(tconn, pi); | |
3339 | ||
b411b363 PR |
3340 | exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) |
3341 | : apv == 88 ? sizeof(struct p_rs_param) | |
3342 | + SHARED_SECRET_MAX | |
8e26f9cc PR |
3343 | : apv <= 94 ? sizeof(struct p_rs_param_89) |
3344 | : /* apv >= 95 */ sizeof(struct p_rs_param_95); | |
b411b363 | 3345 | |
e2857216 | 3346 | if (pi->size > exp_max_sz) { |
b411b363 | 3347 | dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n", |
e2857216 | 3348 | pi->size, exp_max_sz); |
82bc0194 | 3349 | return -EIO; |
b411b363 PR |
3350 | } |
3351 | ||
3352 | if (apv <= 88) { | |
e658983a | 3353 | header_size = sizeof(struct p_rs_param); |
e2857216 | 3354 | data_size = pi->size - header_size; |
8e26f9cc | 3355 | } else if (apv <= 94) { |
e658983a | 3356 | header_size = sizeof(struct p_rs_param_89); |
e2857216 | 3357 | data_size = pi->size - header_size; |
b411b363 | 3358 | D_ASSERT(data_size == 0); |
8e26f9cc | 3359 | } else { |
e658983a | 3360 | header_size = sizeof(struct p_rs_param_95); |
e2857216 | 3361 | data_size = pi->size - header_size; |
b411b363 PR |
3362 | D_ASSERT(data_size == 0); |
3363 | } | |
3364 | ||
3365 | /* initialize verify_alg and csums_alg */ | |
e658983a | 3366 | p = pi->data; |
b411b363 PR |
3367 | memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); |
3368 | ||
e658983a | 3369 | err = drbd_recv_all(mdev->tconn, p, header_size); |
82bc0194 AG |
3370 | if (err) |
3371 | return err; | |
b411b363 | 3372 | |
daeda1cc PR |
3373 | mutex_lock(&mdev->tconn->conf_update); |
3374 | old_net_conf = mdev->tconn->net_conf; | |
813472ce PR |
3375 | if (get_ldev(mdev)) { |
3376 | new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); | |
3377 | if (!new_disk_conf) { | |
3378 | put_ldev(mdev); | |
3379 | mutex_unlock(&mdev->tconn->conf_update); | |
3380 | dev_err(DEV, "Allocation of new disk_conf failed\n"); | |
3381 | return -ENOMEM; | |
3382 | } | |
daeda1cc | 3383 | |
813472ce PR |
3384 | old_disk_conf = mdev->ldev->disk_conf; |
3385 | *new_disk_conf = *old_disk_conf; | |
3386 | ||
6394b935 | 3387 | new_disk_conf->resync_rate = be32_to_cpu(p->resync_rate); |
813472ce | 3388 | } |
daeda1cc | 3389 | |
b411b363 PR |
3390 | if (apv >= 88) { |
3391 | if (apv == 88) { | |
e4bad1bc PR |
3392 | if (data_size > SHARED_SECRET_MAX || data_size == 0) { |
3393 | dev_err(DEV, "verify-alg of wrong size, " | |
3394 | "peer wants %u, accepting only up to %u byte\n", | |
3395 | data_size, SHARED_SECRET_MAX); | |
813472ce PR |
3396 | err = -EIO; |
3397 | goto reconnect; | |
b411b363 PR |
3398 | } |
3399 | ||
82bc0194 | 3400 | err = drbd_recv_all(mdev->tconn, p->verify_alg, data_size); |
813472ce PR |
3401 | if (err) |
3402 | goto reconnect; | |
b411b363 PR |
3403 | /* we expect NUL terminated string */ |
3404 | /* but just in case someone tries to be evil */ | |
3405 | D_ASSERT(p->verify_alg[data_size-1] == 0); | |
3406 | p->verify_alg[data_size-1] = 0; | |
3407 | ||
3408 | } else /* apv >= 89 */ { | |
3409 | /* we still expect NUL terminated strings */ | |
3410 | /* but just in case someone tries to be evil */ | |
3411 | D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0); | |
3412 | D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0); | |
3413 | p->verify_alg[SHARED_SECRET_MAX-1] = 0; | |
3414 | p->csums_alg[SHARED_SECRET_MAX-1] = 0; | |
3415 | } | |
3416 | ||
2ec91e0e | 3417 | if (strcmp(old_net_conf->verify_alg, p->verify_alg)) { |
b411b363 PR |
3418 | if (mdev->state.conn == C_WF_REPORT_PARAMS) { |
3419 | dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", | |
2ec91e0e | 3420 | old_net_conf->verify_alg, p->verify_alg); |
b411b363 PR |
3421 | goto disconnect; |
3422 | } | |
3423 | verify_tfm = drbd_crypto_alloc_digest_safe(mdev, | |
3424 | p->verify_alg, "verify-alg"); | |
3425 | if (IS_ERR(verify_tfm)) { | |
3426 | verify_tfm = NULL; | |
3427 | goto disconnect; | |
3428 | } | |
3429 | } | |
3430 | ||
2ec91e0e | 3431 | if (apv >= 89 && strcmp(old_net_conf->csums_alg, p->csums_alg)) { |
b411b363 PR |
3432 | if (mdev->state.conn == C_WF_REPORT_PARAMS) { |
3433 | dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", | |
2ec91e0e | 3434 | old_net_conf->csums_alg, p->csums_alg); |
b411b363 PR |
3435 | goto disconnect; |
3436 | } | |
3437 | csums_tfm = drbd_crypto_alloc_digest_safe(mdev, | |
3438 | p->csums_alg, "csums-alg"); | |
3439 | if (IS_ERR(csums_tfm)) { | |
3440 | csums_tfm = NULL; | |
3441 | goto disconnect; | |
3442 | } | |
3443 | } | |
3444 | ||
813472ce | 3445 | if (apv > 94 && new_disk_conf) { |
daeda1cc PR |
3446 | new_disk_conf->c_plan_ahead = be32_to_cpu(p->c_plan_ahead); |
3447 | new_disk_conf->c_delay_target = be32_to_cpu(p->c_delay_target); | |
3448 | new_disk_conf->c_fill_target = be32_to_cpu(p->c_fill_target); | |
3449 | new_disk_conf->c_max_rate = be32_to_cpu(p->c_max_rate); | |
778f271d | 3450 | |
daeda1cc | 3451 | fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ; |
9958c857 | 3452 | if (fifo_size != mdev->rs_plan_s->size) { |
813472ce PR |
3453 | new_plan = fifo_alloc(fifo_size); |
3454 | if (!new_plan) { | |
778f271d | 3455 | dev_err(DEV, "kmalloc of fifo_buffer failed"); |
f399002e | 3456 | put_ldev(mdev); |
778f271d PR |
3457 | goto disconnect; |
3458 | } | |
3459 | } | |
8e26f9cc | 3460 | } |
b411b363 | 3461 | |
91fd4dad | 3462 | if (verify_tfm || csums_tfm) { |
2ec91e0e PR |
3463 | new_net_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL); |
3464 | if (!new_net_conf) { | |
91fd4dad PR |
3465 | dev_err(DEV, "Allocation of new net_conf failed\n"); |
3466 | goto disconnect; | |
3467 | } | |
3468 | ||
2ec91e0e | 3469 | *new_net_conf = *old_net_conf; |
91fd4dad PR |
3470 | |
3471 | if (verify_tfm) { | |
2ec91e0e PR |
3472 | strcpy(new_net_conf->verify_alg, p->verify_alg); |
3473 | new_net_conf->verify_alg_len = strlen(p->verify_alg) + 1; | |
91fd4dad PR |
3474 | crypto_free_hash(mdev->tconn->verify_tfm); |
3475 | mdev->tconn->verify_tfm = verify_tfm; | |
3476 | dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg); | |
3477 | } | |
3478 | if (csums_tfm) { | |
2ec91e0e PR |
3479 | strcpy(new_net_conf->csums_alg, p->csums_alg); |
3480 | new_net_conf->csums_alg_len = strlen(p->csums_alg) + 1; | |
91fd4dad PR |
3481 | crypto_free_hash(mdev->tconn->csums_tfm); |
3482 | mdev->tconn->csums_tfm = csums_tfm; | |
3483 | dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg); | |
3484 | } | |
2ec91e0e | 3485 | rcu_assign_pointer(tconn->net_conf, new_net_conf); |
b411b363 | 3486 | } |
daeda1cc | 3487 | } |
91fd4dad | 3488 | |
813472ce PR |
3489 | if (new_disk_conf) { |
3490 | rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf); | |
3491 | put_ldev(mdev); | |
3492 | } | |
3493 | ||
3494 | if (new_plan) { | |
3495 | old_plan = mdev->rs_plan_s; | |
3496 | rcu_assign_pointer(mdev->rs_plan_s, new_plan); | |
b411b363 | 3497 | } |
daeda1cc PR |
3498 | |
3499 | mutex_unlock(&mdev->tconn->conf_update); | |
3500 | synchronize_rcu(); | |
3501 | if (new_net_conf) | |
3502 | kfree(old_net_conf); | |
3503 | kfree(old_disk_conf); | |
813472ce | 3504 | kfree(old_plan); |
daeda1cc | 3505 | |
82bc0194 | 3506 | return 0; |
b411b363 | 3507 | |
813472ce PR |
3508 | reconnect: |
3509 | if (new_disk_conf) { | |
3510 | put_ldev(mdev); | |
3511 | kfree(new_disk_conf); | |
3512 | } | |
3513 | mutex_unlock(&mdev->tconn->conf_update); | |
3514 | return -EIO; | |
3515 | ||
b411b363 | 3516 | disconnect: |
813472ce PR |
3517 | kfree(new_plan); |
3518 | if (new_disk_conf) { | |
3519 | put_ldev(mdev); | |
3520 | kfree(new_disk_conf); | |
3521 | } | |
a0095508 | 3522 | mutex_unlock(&mdev->tconn->conf_update); |
b411b363 PR |
3523 | /* just for completeness: actually not needed, |
3524 | * as this is not reached if csums_tfm was ok. */ | |
3525 | crypto_free_hash(csums_tfm); | |
3526 | /* but free the verify_tfm again, if csums_tfm did not work out */ | |
3527 | crypto_free_hash(verify_tfm); | |
38fa9988 | 3528 | conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 3529 | return -EIO; |
b411b363 PR |
3530 | } |
3531 | ||
b411b363 PR |
3532 | /* warn if the arguments differ by more than 12.5% */ |
3533 | static void warn_if_differ_considerably(struct drbd_conf *mdev, | |
3534 | const char *s, sector_t a, sector_t b) | |
3535 | { | |
3536 | sector_t d; | |
3537 | if (a == 0 || b == 0) | |
3538 | return; | |
3539 | d = (a > b) ? (a - b) : (b - a); | |
3540 | if (d > (a>>3) || d > (b>>3)) | |
3541 | dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s, | |
3542 | (unsigned long long)a, (unsigned long long)b); | |
3543 | } | |
3544 | ||
4a76b161 | 3545 | static int receive_sizes(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 3546 | { |
4a76b161 | 3547 | struct drbd_conf *mdev; |
e658983a | 3548 | struct p_sizes *p = pi->data; |
b411b363 | 3549 | enum determine_dev_size dd = unchanged; |
b411b363 PR |
3550 | sector_t p_size, p_usize, my_usize; |
3551 | int ldsc = 0; /* local disk size changed */ | |
e89b591c | 3552 | enum dds_flags ddsf; |
b411b363 | 3553 | |
4a76b161 AG |
3554 | mdev = vnr_to_mdev(tconn, pi->vnr); |
3555 | if (!mdev) | |
3556 | return config_unknown_volume(tconn, pi); | |
3557 | ||
b411b363 PR |
3558 | p_size = be64_to_cpu(p->d_size); |
3559 | p_usize = be64_to_cpu(p->u_size); | |
3560 | ||
b411b363 PR |
3561 | /* just store the peer's disk size for now. |
3562 | * we still need to figure out whether we accept that. */ | |
3563 | mdev->p_size = p_size; | |
3564 | ||
b411b363 | 3565 | if (get_ldev(mdev)) { |
daeda1cc PR |
3566 | rcu_read_lock(); |
3567 | my_usize = rcu_dereference(mdev->ldev->disk_conf)->disk_size; | |
3568 | rcu_read_unlock(); | |
3569 | ||
b411b363 PR |
3570 | warn_if_differ_considerably(mdev, "lower level device sizes", |
3571 | p_size, drbd_get_max_capacity(mdev->ldev)); | |
3572 | warn_if_differ_considerably(mdev, "user requested size", | |
daeda1cc | 3573 | p_usize, my_usize); |
b411b363 PR |
3574 | |
3575 | /* if this is the first connect, or an otherwise expected | |
3576 | * param exchange, choose the minimum */ | |
3577 | if (mdev->state.conn == C_WF_REPORT_PARAMS) | |
daeda1cc | 3578 | p_usize = min_not_zero(my_usize, p_usize); |
b411b363 PR |
3579 | |
3580 | /* Never shrink a device with usable data during connect. | |
3581 | But allow online shrinking if we are connected. */ | |
ef5e44a6 | 3582 | if (drbd_new_dev_size(mdev, mdev->ldev, p_usize, 0) < |
daeda1cc PR |
3583 | drbd_get_capacity(mdev->this_bdev) && |
3584 | mdev->state.disk >= D_OUTDATED && | |
3585 | mdev->state.conn < C_CONNECTED) { | |
b411b363 | 3586 | dev_err(DEV, "The peer's disk size is too small!\n"); |
38fa9988 | 3587 | conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 | 3588 | put_ldev(mdev); |
82bc0194 | 3589 | return -EIO; |
b411b363 | 3590 | } |
daeda1cc PR |
3591 | |
3592 | if (my_usize != p_usize) { | |
3593 | struct disk_conf *old_disk_conf, *new_disk_conf = NULL; | |
3594 | ||
3595 | new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); | |
3596 | if (!new_disk_conf) { | |
3597 | dev_err(DEV, "Allocation of new disk_conf failed\n"); | |
3598 | put_ldev(mdev); | |
3599 | return -ENOMEM; | |
3600 | } | |
3601 | ||
3602 | mutex_lock(&mdev->tconn->conf_update); | |
3603 | old_disk_conf = mdev->ldev->disk_conf; | |
3604 | *new_disk_conf = *old_disk_conf; | |
3605 | new_disk_conf->disk_size = p_usize; | |
3606 | ||
3607 | rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf); | |
3608 | mutex_unlock(&mdev->tconn->conf_update); | |
3609 | synchronize_rcu(); | |
3610 | kfree(old_disk_conf); | |
3611 | ||
3612 | dev_info(DEV, "Peer sets u_size to %lu sectors\n", | |
3613 | (unsigned long)my_usize); | |
3614 | } | |
3615 | ||
b411b363 PR |
3616 | put_ldev(mdev); |
3617 | } | |
b411b363 | 3618 | |
e89b591c | 3619 | ddsf = be16_to_cpu(p->dds_flags); |
b411b363 | 3620 | if (get_ldev(mdev)) { |
24c4830c | 3621 | dd = drbd_determine_dev_size(mdev, ddsf); |
b411b363 PR |
3622 | put_ldev(mdev); |
3623 | if (dd == dev_size_error) | |
82bc0194 | 3624 | return -EIO; |
b411b363 PR |
3625 | drbd_md_sync(mdev); |
3626 | } else { | |
3627 | /* I am diskless, need to accept the peer's size. */ | |
3628 | drbd_set_my_capacity(mdev, p_size); | |
3629 | } | |
3630 | ||
99432fcc PR |
3631 | mdev->peer_max_bio_size = be32_to_cpu(p->max_bio_size); |
3632 | drbd_reconsider_max_bio_size(mdev); | |
3633 | ||
b411b363 PR |
3634 | if (get_ldev(mdev)) { |
3635 | if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { | |
3636 | mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); | |
3637 | ldsc = 1; | |
3638 | } | |
3639 | ||
b411b363 PR |
3640 | put_ldev(mdev); |
3641 | } | |
3642 | ||
3643 | if (mdev->state.conn > C_WF_REPORT_PARAMS) { | |
3644 | if (be64_to_cpu(p->c_size) != | |
3645 | drbd_get_capacity(mdev->this_bdev) || ldsc) { | |
3646 | /* we have different sizes, probably peer | |
3647 | * needs to know my new size... */ | |
e89b591c | 3648 | drbd_send_sizes(mdev, 0, ddsf); |
b411b363 PR |
3649 | } |
3650 | if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) || | |
3651 | (dd == grew && mdev->state.conn == C_CONNECTED)) { | |
3652 | if (mdev->state.pdsk >= D_INCONSISTENT && | |
e89b591c PR |
3653 | mdev->state.disk >= D_INCONSISTENT) { |
3654 | if (ddsf & DDSF_NO_RESYNC) | |
3655 | dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n"); | |
3656 | else | |
3657 | resync_after_online_grow(mdev); | |
3658 | } else | |
b411b363 PR |
3659 | set_bit(RESYNC_AFTER_NEG, &mdev->flags); |
3660 | } | |
3661 | } | |
3662 | ||
82bc0194 | 3663 | return 0; |
b411b363 PR |
3664 | } |
3665 | ||
4a76b161 | 3666 | static int receive_uuids(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 3667 | { |
4a76b161 | 3668 | struct drbd_conf *mdev; |
e658983a | 3669 | struct p_uuids *p = pi->data; |
b411b363 | 3670 | u64 *p_uuid; |
62b0da3a | 3671 | int i, updated_uuids = 0; |
b411b363 | 3672 | |
4a76b161 AG |
3673 | mdev = vnr_to_mdev(tconn, pi->vnr); |
3674 | if (!mdev) | |
3675 | return config_unknown_volume(tconn, pi); | |
3676 | ||
b411b363 PR |
3677 | p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); |
3678 | ||
3679 | for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) | |
3680 | p_uuid[i] = be64_to_cpu(p->uuid[i]); | |
3681 | ||
3682 | kfree(mdev->p_uuid); | |
3683 | mdev->p_uuid = p_uuid; | |
3684 | ||
3685 | if (mdev->state.conn < C_CONNECTED && | |
3686 | mdev->state.disk < D_INCONSISTENT && | |
3687 | mdev->state.role == R_PRIMARY && | |
3688 | (mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { | |
3689 | dev_err(DEV, "Can only connect to data with current UUID=%016llX\n", | |
3690 | (unsigned long long)mdev->ed_uuid); | |
38fa9988 | 3691 | conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 3692 | return -EIO; |
b411b363 PR |
3693 | } |
3694 | ||
3695 | if (get_ldev(mdev)) { | |
3696 | int skip_initial_sync = | |
3697 | mdev->state.conn == C_CONNECTED && | |
31890f4a | 3698 | mdev->tconn->agreed_pro_version >= 90 && |
b411b363 PR |
3699 | mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && |
3700 | (p_uuid[UI_FLAGS] & 8); | |
3701 | if (skip_initial_sync) { | |
3702 | dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n"); | |
3703 | drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, | |
20ceb2b2 LE |
3704 | "clear_n_write from receive_uuids", |
3705 | BM_LOCKED_TEST_ALLOWED); | |
b411b363 PR |
3706 | _drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]); |
3707 | _drbd_uuid_set(mdev, UI_BITMAP, 0); | |
3708 | _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), | |
3709 | CS_VERBOSE, NULL); | |
3710 | drbd_md_sync(mdev); | |
62b0da3a | 3711 | updated_uuids = 1; |
b411b363 PR |
3712 | } |
3713 | put_ldev(mdev); | |
18a50fa2 PR |
3714 | } else if (mdev->state.disk < D_INCONSISTENT && |
3715 | mdev->state.role == R_PRIMARY) { | |
3716 | /* I am a diskless primary, the peer just created a new current UUID | |
3717 | for me. */ | |
62b0da3a | 3718 | updated_uuids = drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); |
b411b363 PR |
3719 | } |
3720 | ||
3721 | /* Before we test for the disk state, we should wait until an eventually | |
3722 | ongoing cluster wide state change is finished. That is important if | |
3723 | we are primary and are detaching from our disk. We need to see the | |
3724 | new disk state... */ | |
8410da8f PR |
3725 | mutex_lock(mdev->state_mutex); |
3726 | mutex_unlock(mdev->state_mutex); | |
b411b363 | 3727 | if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT) |
62b0da3a LE |
3728 | updated_uuids |= drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]); |
3729 | ||
3730 | if (updated_uuids) | |
3731 | drbd_print_uuids(mdev, "receiver updated UUIDs to"); | |
b411b363 | 3732 | |
82bc0194 | 3733 | return 0; |
b411b363 PR |
3734 | } |
3735 | ||
3736 | /** | |
3737 | * convert_state() - Converts the peer's view of the cluster state to our point of view | |
3738 | * @ps: The state as seen by the peer. | |
3739 | */ | |
3740 | static union drbd_state convert_state(union drbd_state ps) | |
3741 | { | |
3742 | union drbd_state ms; | |
3743 | ||
3744 | static enum drbd_conns c_tab[] = { | |
369bea63 | 3745 | [C_WF_REPORT_PARAMS] = C_WF_REPORT_PARAMS, |
b411b363 PR |
3746 | [C_CONNECTED] = C_CONNECTED, |
3747 | ||
3748 | [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, | |
3749 | [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, | |
3750 | [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ | |
3751 | [C_VERIFY_S] = C_VERIFY_T, | |
3752 | [C_MASK] = C_MASK, | |
3753 | }; | |
3754 | ||
3755 | ms.i = ps.i; | |
3756 | ||
3757 | ms.conn = c_tab[ps.conn]; | |
3758 | ms.peer = ps.role; | |
3759 | ms.role = ps.peer; | |
3760 | ms.pdsk = ps.disk; | |
3761 | ms.disk = ps.pdsk; | |
3762 | ms.peer_isp = (ps.aftr_isp | ps.user_isp); | |
3763 | ||
3764 | return ms; | |
3765 | } | |
3766 | ||
4a76b161 | 3767 | static int receive_req_state(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 3768 | { |
4a76b161 | 3769 | struct drbd_conf *mdev; |
e658983a | 3770 | struct p_req_state *p = pi->data; |
b411b363 | 3771 | union drbd_state mask, val; |
bf885f8a | 3772 | enum drbd_state_rv rv; |
b411b363 | 3773 | |
4a76b161 AG |
3774 | mdev = vnr_to_mdev(tconn, pi->vnr); |
3775 | if (!mdev) | |
3776 | return -EIO; | |
3777 | ||
b411b363 PR |
3778 | mask.i = be32_to_cpu(p->mask); |
3779 | val.i = be32_to_cpu(p->val); | |
3780 | ||
25703f83 | 3781 | if (test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags) && |
8410da8f | 3782 | mutex_is_locked(mdev->state_mutex)) { |
b411b363 | 3783 | drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG); |
82bc0194 | 3784 | return 0; |
b411b363 PR |
3785 | } |
3786 | ||
3787 | mask = convert_state(mask); | |
3788 | val = convert_state(val); | |
3789 | ||
dfafcc8a PR |
3790 | rv = drbd_change_state(mdev, CS_VERBOSE, mask, val); |
3791 | drbd_send_sr_reply(mdev, rv); | |
b411b363 | 3792 | |
b411b363 PR |
3793 | drbd_md_sync(mdev); |
3794 | ||
82bc0194 | 3795 | return 0; |
b411b363 PR |
3796 | } |
3797 | ||
e2857216 | 3798 | static int receive_req_conn_state(struct drbd_tconn *tconn, struct packet_info *pi) |
dfafcc8a | 3799 | { |
e658983a | 3800 | struct p_req_state *p = pi->data; |
dfafcc8a PR |
3801 | union drbd_state mask, val; |
3802 | enum drbd_state_rv rv; | |
3803 | ||
3804 | mask.i = be32_to_cpu(p->mask); | |
3805 | val.i = be32_to_cpu(p->val); | |
3806 | ||
3807 | if (test_bit(DISCARD_CONCURRENT, &tconn->flags) && | |
3808 | mutex_is_locked(&tconn->cstate_mutex)) { | |
3809 | conn_send_sr_reply(tconn, SS_CONCURRENT_ST_CHG); | |
82bc0194 | 3810 | return 0; |
dfafcc8a PR |
3811 | } |
3812 | ||
3813 | mask = convert_state(mask); | |
3814 | val = convert_state(val); | |
3815 | ||
778bcf2e | 3816 | rv = conn_request_state(tconn, mask, val, CS_VERBOSE | CS_LOCAL_ONLY | CS_IGN_OUTD_FAIL); |
dfafcc8a PR |
3817 | conn_send_sr_reply(tconn, rv); |
3818 | ||
82bc0194 | 3819 | return 0; |
dfafcc8a PR |
3820 | } |
3821 | ||
4a76b161 | 3822 | static int receive_state(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 3823 | { |
4a76b161 | 3824 | struct drbd_conf *mdev; |
e658983a | 3825 | struct p_state *p = pi->data; |
4ac4aada | 3826 | union drbd_state os, ns, peer_state; |
b411b363 | 3827 | enum drbd_disk_state real_peer_disk; |
65d922c3 | 3828 | enum chg_state_flags cs_flags; |
b411b363 PR |
3829 | int rv; |
3830 | ||
4a76b161 AG |
3831 | mdev = vnr_to_mdev(tconn, pi->vnr); |
3832 | if (!mdev) | |
3833 | return config_unknown_volume(tconn, pi); | |
3834 | ||
b411b363 PR |
3835 | peer_state.i = be32_to_cpu(p->state); |
3836 | ||
3837 | real_peer_disk = peer_state.disk; | |
3838 | if (peer_state.disk == D_NEGOTIATING) { | |
3839 | real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; | |
3840 | dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); | |
3841 | } | |
3842 | ||
87eeee41 | 3843 | spin_lock_irq(&mdev->tconn->req_lock); |
b411b363 | 3844 | retry: |
78bae59b | 3845 | os = ns = drbd_read_state(mdev); |
87eeee41 | 3846 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 3847 | |
b8853dbd PR |
3848 | /* If some other part of the code (asender thread, timeout) |
3849 | * already decided to close the connection again, | |
3850 | * we must not "re-establish" it here. */ | |
3851 | if (os.conn <= C_TEAR_DOWN) | |
58ffa580 | 3852 | return -ECONNRESET; |
b8853dbd | 3853 | |
9bcd2521 PR |
3854 | /* If this is the "end of sync" confirmation, usually the peer disk |
3855 | * transitions from D_INCONSISTENT to D_UP_TO_DATE. For empty (0 bits | |
3856 | * set) resync started in PausedSyncT, or if the timing of pause-/ | |
3857 | * unpause-sync events has been "just right", the peer disk may | |
3858 | * transition from D_CONSISTENT to D_UP_TO_DATE as well. | |
3859 | */ | |
3860 | if ((os.pdsk == D_INCONSISTENT || os.pdsk == D_CONSISTENT) && | |
3861 | real_peer_disk == D_UP_TO_DATE && | |
e9ef7bb6 LE |
3862 | os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { |
3863 | /* If we are (becoming) SyncSource, but peer is still in sync | |
3864 | * preparation, ignore its uptodate-ness to avoid flapping, it | |
3865 | * will change to inconsistent once the peer reaches active | |
3866 | * syncing states. | |
3867 | * It may have changed syncer-paused flags, however, so we | |
3868 | * cannot ignore this completely. */ | |
3869 | if (peer_state.conn > C_CONNECTED && | |
3870 | peer_state.conn < C_SYNC_SOURCE) | |
3871 | real_peer_disk = D_INCONSISTENT; | |
3872 | ||
3873 | /* if peer_state changes to connected at the same time, | |
3874 | * it explicitly notifies us that it finished resync. | |
3875 | * Maybe we should finish it up, too? */ | |
3876 | else if (os.conn >= C_SYNC_SOURCE && | |
3877 | peer_state.conn == C_CONNECTED) { | |
3878 | if (drbd_bm_total_weight(mdev) <= mdev->rs_failed) | |
3879 | drbd_resync_finished(mdev); | |
82bc0194 | 3880 | return 0; |
e9ef7bb6 LE |
3881 | } |
3882 | } | |
3883 | ||
58ffa580 LE |
3884 | /* explicit verify finished notification, stop sector reached. */ |
3885 | if (os.conn == C_VERIFY_T && os.disk == D_UP_TO_DATE && | |
3886 | peer_state.conn == C_CONNECTED && real_peer_disk == D_UP_TO_DATE) { | |
3887 | ov_out_of_sync_print(mdev); | |
3888 | drbd_resync_finished(mdev); | |
3889 | return 0; | |
3890 | } | |
3891 | ||
e9ef7bb6 LE |
3892 | /* peer says his disk is inconsistent, while we think it is uptodate, |
3893 | * and this happens while the peer still thinks we have a sync going on, | |
3894 | * but we think we are already done with the sync. | |
3895 | * We ignore this to avoid flapping pdsk. | |
3896 | * This should not happen, if the peer is a recent version of drbd. */ | |
3897 | if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && | |
3898 | os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) | |
3899 | real_peer_disk = D_UP_TO_DATE; | |
3900 | ||
4ac4aada LE |
3901 | if (ns.conn == C_WF_REPORT_PARAMS) |
3902 | ns.conn = C_CONNECTED; | |
b411b363 | 3903 | |
67531718 PR |
3904 | if (peer_state.conn == C_AHEAD) |
3905 | ns.conn = C_BEHIND; | |
3906 | ||
b411b363 PR |
3907 | if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING && |
3908 | get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
3909 | int cr; /* consider resync */ | |
3910 | ||
3911 | /* if we established a new connection */ | |
4ac4aada | 3912 | cr = (os.conn < C_CONNECTED); |
b411b363 PR |
3913 | /* if we had an established connection |
3914 | * and one of the nodes newly attaches a disk */ | |
4ac4aada | 3915 | cr |= (os.conn == C_CONNECTED && |
b411b363 | 3916 | (peer_state.disk == D_NEGOTIATING || |
4ac4aada | 3917 | os.disk == D_NEGOTIATING)); |
b411b363 PR |
3918 | /* if we have both been inconsistent, and the peer has been |
3919 | * forced to be UpToDate with --overwrite-data */ | |
3920 | cr |= test_bit(CONSIDER_RESYNC, &mdev->flags); | |
3921 | /* if we had been plain connected, and the admin requested to | |
3922 | * start a sync by "invalidate" or "invalidate-remote" */ | |
4ac4aada | 3923 | cr |= (os.conn == C_CONNECTED && |
b411b363 PR |
3924 | (peer_state.conn >= C_STARTING_SYNC_S && |
3925 | peer_state.conn <= C_WF_BITMAP_T)); | |
3926 | ||
3927 | if (cr) | |
4ac4aada | 3928 | ns.conn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk); |
b411b363 PR |
3929 | |
3930 | put_ldev(mdev); | |
4ac4aada LE |
3931 | if (ns.conn == C_MASK) { |
3932 | ns.conn = C_CONNECTED; | |
b411b363 | 3933 | if (mdev->state.disk == D_NEGOTIATING) { |
82f59cc6 | 3934 | drbd_force_state(mdev, NS(disk, D_FAILED)); |
b411b363 PR |
3935 | } else if (peer_state.disk == D_NEGOTIATING) { |
3936 | dev_err(DEV, "Disk attach process on the peer node was aborted.\n"); | |
3937 | peer_state.disk = D_DISKLESS; | |
580b9767 | 3938 | real_peer_disk = D_DISKLESS; |
b411b363 | 3939 | } else { |
8169e41b | 3940 | if (test_and_clear_bit(CONN_DRY_RUN, &mdev->tconn->flags)) |
82bc0194 | 3941 | return -EIO; |
4ac4aada | 3942 | D_ASSERT(os.conn == C_WF_REPORT_PARAMS); |
38fa9988 | 3943 | conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 3944 | return -EIO; |
b411b363 PR |
3945 | } |
3946 | } | |
3947 | } | |
3948 | ||
87eeee41 | 3949 | spin_lock_irq(&mdev->tconn->req_lock); |
78bae59b | 3950 | if (os.i != drbd_read_state(mdev).i) |
b411b363 PR |
3951 | goto retry; |
3952 | clear_bit(CONSIDER_RESYNC, &mdev->flags); | |
b411b363 PR |
3953 | ns.peer = peer_state.role; |
3954 | ns.pdsk = real_peer_disk; | |
3955 | ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); | |
4ac4aada | 3956 | if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) |
b411b363 | 3957 | ns.disk = mdev->new_state_tmp.disk; |
4ac4aada | 3958 | cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); |
2aebfabb | 3959 | if (ns.pdsk == D_CONSISTENT && drbd_suspended(mdev) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && |
481c6f50 | 3960 | test_bit(NEW_CUR_UUID, &mdev->flags)) { |
8554df1c | 3961 | /* Do not allow tl_restart(RESEND) for a rebooted peer. We can only allow this |
481c6f50 | 3962 | for temporal network outages! */ |
87eeee41 | 3963 | spin_unlock_irq(&mdev->tconn->req_lock); |
481c6f50 | 3964 | dev_err(DEV, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); |
2f5cdd0b | 3965 | tl_clear(mdev->tconn); |
481c6f50 PR |
3966 | drbd_uuid_new_current(mdev); |
3967 | clear_bit(NEW_CUR_UUID, &mdev->flags); | |
38fa9988 | 3968 | conn_request_state(mdev->tconn, NS2(conn, C_PROTOCOL_ERROR, susp, 0), CS_HARD); |
82bc0194 | 3969 | return -EIO; |
481c6f50 | 3970 | } |
65d922c3 | 3971 | rv = _drbd_set_state(mdev, ns, cs_flags, NULL); |
78bae59b | 3972 | ns = drbd_read_state(mdev); |
87eeee41 | 3973 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
3974 | |
3975 | if (rv < SS_SUCCESS) { | |
38fa9988 | 3976 | conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 3977 | return -EIO; |
b411b363 PR |
3978 | } |
3979 | ||
4ac4aada LE |
3980 | if (os.conn > C_WF_REPORT_PARAMS) { |
3981 | if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED && | |
b411b363 PR |
3982 | peer_state.disk != D_NEGOTIATING ) { |
3983 | /* we want resync, peer has not yet decided to sync... */ | |
3984 | /* Nowadays only used when forcing a node into primary role and | |
3985 | setting its disk to UpToDate with that */ | |
3986 | drbd_send_uuids(mdev); | |
43de7c85 | 3987 | drbd_send_current_state(mdev); |
b411b363 PR |
3988 | } |
3989 | } | |
3990 | ||
08b165ba | 3991 | clear_bit(DISCARD_MY_DATA, &mdev->flags); |
b411b363 PR |
3992 | |
3993 | drbd_md_sync(mdev); /* update connected indicator, la_size, ... */ | |
3994 | ||
82bc0194 | 3995 | return 0; |
b411b363 PR |
3996 | } |
3997 | ||
4a76b161 | 3998 | static int receive_sync_uuid(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 3999 | { |
4a76b161 | 4000 | struct drbd_conf *mdev; |
e658983a | 4001 | struct p_rs_uuid *p = pi->data; |
4a76b161 AG |
4002 | |
4003 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
4004 | if (!mdev) | |
4005 | return -EIO; | |
b411b363 PR |
4006 | |
4007 | wait_event(mdev->misc_wait, | |
4008 | mdev->state.conn == C_WF_SYNC_UUID || | |
c4752ef1 | 4009 | mdev->state.conn == C_BEHIND || |
b411b363 PR |
4010 | mdev->state.conn < C_CONNECTED || |
4011 | mdev->state.disk < D_NEGOTIATING); | |
4012 | ||
4013 | /* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */ | |
4014 | ||
b411b363 PR |
4015 | /* Here the _drbd_uuid_ functions are right, current should |
4016 | _not_ be rotated into the history */ | |
4017 | if (get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
4018 | _drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid)); | |
4019 | _drbd_uuid_set(mdev, UI_BITMAP, 0UL); | |
4020 | ||
62b0da3a | 4021 | drbd_print_uuids(mdev, "updated sync uuid"); |
b411b363 PR |
4022 | drbd_start_resync(mdev, C_SYNC_TARGET); |
4023 | ||
4024 | put_ldev(mdev); | |
4025 | } else | |
4026 | dev_err(DEV, "Ignoring SyncUUID packet!\n"); | |
4027 | ||
82bc0194 | 4028 | return 0; |
b411b363 PR |
4029 | } |
4030 | ||
2c46407d AG |
4031 | /** |
4032 | * receive_bitmap_plain | |
4033 | * | |
4034 | * Return 0 when done, 1 when another iteration is needed, and a negative error | |
4035 | * code upon failure. | |
4036 | */ | |
4037 | static int | |
50d0b1ad | 4038 | receive_bitmap_plain(struct drbd_conf *mdev, unsigned int size, |
e658983a | 4039 | unsigned long *p, struct bm_xfer_ctx *c) |
b411b363 | 4040 | { |
50d0b1ad AG |
4041 | unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - |
4042 | drbd_header_size(mdev->tconn); | |
e658983a | 4043 | unsigned int num_words = min_t(size_t, data_size / sizeof(*p), |
50d0b1ad | 4044 | c->bm_words - c->word_offset); |
e658983a | 4045 | unsigned int want = num_words * sizeof(*p); |
2c46407d | 4046 | int err; |
b411b363 | 4047 | |
50d0b1ad AG |
4048 | if (want != size) { |
4049 | dev_err(DEV, "%s:want (%u) != size (%u)\n", __func__, want, size); | |
2c46407d | 4050 | return -EIO; |
b411b363 PR |
4051 | } |
4052 | if (want == 0) | |
2c46407d | 4053 | return 0; |
e658983a | 4054 | err = drbd_recv_all(mdev->tconn, p, want); |
82bc0194 | 4055 | if (err) |
2c46407d | 4056 | return err; |
b411b363 | 4057 | |
e658983a | 4058 | drbd_bm_merge_lel(mdev, c->word_offset, num_words, p); |
b411b363 PR |
4059 | |
4060 | c->word_offset += num_words; | |
4061 | c->bit_offset = c->word_offset * BITS_PER_LONG; | |
4062 | if (c->bit_offset > c->bm_bits) | |
4063 | c->bit_offset = c->bm_bits; | |
4064 | ||
2c46407d | 4065 | return 1; |
b411b363 PR |
4066 | } |
4067 | ||
a02d1240 AG |
4068 | static enum drbd_bitmap_code dcbp_get_code(struct p_compressed_bm *p) |
4069 | { | |
4070 | return (enum drbd_bitmap_code)(p->encoding & 0x0f); | |
4071 | } | |
4072 | ||
4073 | static int dcbp_get_start(struct p_compressed_bm *p) | |
4074 | { | |
4075 | return (p->encoding & 0x80) != 0; | |
4076 | } | |
4077 | ||
4078 | static int dcbp_get_pad_bits(struct p_compressed_bm *p) | |
4079 | { | |
4080 | return (p->encoding >> 4) & 0x7; | |
4081 | } | |
4082 | ||
2c46407d AG |
4083 | /** |
4084 | * recv_bm_rle_bits | |
4085 | * | |
4086 | * Return 0 when done, 1 when another iteration is needed, and a negative error | |
4087 | * code upon failure. | |
4088 | */ | |
4089 | static int | |
b411b363 PR |
4090 | recv_bm_rle_bits(struct drbd_conf *mdev, |
4091 | struct p_compressed_bm *p, | |
c6d25cfe PR |
4092 | struct bm_xfer_ctx *c, |
4093 | unsigned int len) | |
b411b363 PR |
4094 | { |
4095 | struct bitstream bs; | |
4096 | u64 look_ahead; | |
4097 | u64 rl; | |
4098 | u64 tmp; | |
4099 | unsigned long s = c->bit_offset; | |
4100 | unsigned long e; | |
a02d1240 | 4101 | int toggle = dcbp_get_start(p); |
b411b363 PR |
4102 | int have; |
4103 | int bits; | |
4104 | ||
a02d1240 | 4105 | bitstream_init(&bs, p->code, len, dcbp_get_pad_bits(p)); |
b411b363 PR |
4106 | |
4107 | bits = bitstream_get_bits(&bs, &look_ahead, 64); | |
4108 | if (bits < 0) | |
2c46407d | 4109 | return -EIO; |
b411b363 PR |
4110 | |
4111 | for (have = bits; have > 0; s += rl, toggle = !toggle) { | |
4112 | bits = vli_decode_bits(&rl, look_ahead); | |
4113 | if (bits <= 0) | |
2c46407d | 4114 | return -EIO; |
b411b363 PR |
4115 | |
4116 | if (toggle) { | |
4117 | e = s + rl -1; | |
4118 | if (e >= c->bm_bits) { | |
4119 | dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); | |
2c46407d | 4120 | return -EIO; |
b411b363 PR |
4121 | } |
4122 | _drbd_bm_set_bits(mdev, s, e); | |
4123 | } | |
4124 | ||
4125 | if (have < bits) { | |
4126 | dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", | |
4127 | have, bits, look_ahead, | |
4128 | (unsigned int)(bs.cur.b - p->code), | |
4129 | (unsigned int)bs.buf_len); | |
2c46407d | 4130 | return -EIO; |
b411b363 PR |
4131 | } |
4132 | look_ahead >>= bits; | |
4133 | have -= bits; | |
4134 | ||
4135 | bits = bitstream_get_bits(&bs, &tmp, 64 - have); | |
4136 | if (bits < 0) | |
2c46407d | 4137 | return -EIO; |
b411b363 PR |
4138 | look_ahead |= tmp << have; |
4139 | have += bits; | |
4140 | } | |
4141 | ||
4142 | c->bit_offset = s; | |
4143 | bm_xfer_ctx_bit_to_word_offset(c); | |
4144 | ||
2c46407d | 4145 | return (s != c->bm_bits); |
b411b363 PR |
4146 | } |
4147 | ||
2c46407d AG |
4148 | /** |
4149 | * decode_bitmap_c | |
4150 | * | |
4151 | * Return 0 when done, 1 when another iteration is needed, and a negative error | |
4152 | * code upon failure. | |
4153 | */ | |
4154 | static int | |
b411b363 PR |
4155 | decode_bitmap_c(struct drbd_conf *mdev, |
4156 | struct p_compressed_bm *p, | |
c6d25cfe PR |
4157 | struct bm_xfer_ctx *c, |
4158 | unsigned int len) | |
b411b363 | 4159 | { |
a02d1240 | 4160 | if (dcbp_get_code(p) == RLE_VLI_Bits) |
e658983a | 4161 | return recv_bm_rle_bits(mdev, p, c, len - sizeof(*p)); |
b411b363 PR |
4162 | |
4163 | /* other variants had been implemented for evaluation, | |
4164 | * but have been dropped as this one turned out to be "best" | |
4165 | * during all our tests. */ | |
4166 | ||
4167 | dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding); | |
38fa9988 | 4168 | conn_request_state(mdev->tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); |
2c46407d | 4169 | return -EIO; |
b411b363 PR |
4170 | } |
4171 | ||
4172 | void INFO_bm_xfer_stats(struct drbd_conf *mdev, | |
4173 | const char *direction, struct bm_xfer_ctx *c) | |
4174 | { | |
4175 | /* what would it take to transfer it "plaintext" */ | |
50d0b1ad AG |
4176 | unsigned int header_size = drbd_header_size(mdev->tconn); |
4177 | unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - header_size; | |
4178 | unsigned int plain = | |
4179 | header_size * (DIV_ROUND_UP(c->bm_words, data_size) + 1) + | |
4180 | c->bm_words * sizeof(unsigned long); | |
4181 | unsigned int total = c->bytes[0] + c->bytes[1]; | |
4182 | unsigned int r; | |
b411b363 PR |
4183 | |
4184 | /* total can not be zero. but just in case: */ | |
4185 | if (total == 0) | |
4186 | return; | |
4187 | ||
4188 | /* don't report if not compressed */ | |
4189 | if (total >= plain) | |
4190 | return; | |
4191 | ||
4192 | /* total < plain. check for overflow, still */ | |
4193 | r = (total > UINT_MAX/1000) ? (total / (plain/1000)) | |
4194 | : (1000 * total / plain); | |
4195 | ||
4196 | if (r > 1000) | |
4197 | r = 1000; | |
4198 | ||
4199 | r = 1000 - r; | |
4200 | dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " | |
4201 | "total %u; compression: %u.%u%%\n", | |
4202 | direction, | |
4203 | c->bytes[1], c->packets[1], | |
4204 | c->bytes[0], c->packets[0], | |
4205 | total, r/10, r % 10); | |
4206 | } | |
4207 | ||
4208 | /* Since we are processing the bitfield from lower addresses to higher, | |
4209 | it does not matter if the process it in 32 bit chunks or 64 bit | |
4210 | chunks as long as it is little endian. (Understand it as byte stream, | |
4211 | beginning with the lowest byte...) If we would use big endian | |
4212 | we would need to process it from the highest address to the lowest, | |
4213 | in order to be agnostic to the 32 vs 64 bits issue. | |
4214 | ||
4215 | returns 0 on failure, 1 if we successfully received it. */ | |
4a76b161 | 4216 | static int receive_bitmap(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4217 | { |
4a76b161 | 4218 | struct drbd_conf *mdev; |
b411b363 | 4219 | struct bm_xfer_ctx c; |
2c46407d | 4220 | int err; |
4a76b161 AG |
4221 | |
4222 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
4223 | if (!mdev) | |
4224 | return -EIO; | |
b411b363 | 4225 | |
20ceb2b2 LE |
4226 | drbd_bm_lock(mdev, "receive bitmap", BM_LOCKED_SET_ALLOWED); |
4227 | /* you are supposed to send additional out-of-sync information | |
4228 | * if you actually set bits during this phase */ | |
b411b363 | 4229 | |
b411b363 PR |
4230 | c = (struct bm_xfer_ctx) { |
4231 | .bm_bits = drbd_bm_bits(mdev), | |
4232 | .bm_words = drbd_bm_words(mdev), | |
4233 | }; | |
4234 | ||
2c46407d | 4235 | for(;;) { |
e658983a AG |
4236 | if (pi->cmd == P_BITMAP) |
4237 | err = receive_bitmap_plain(mdev, pi->size, pi->data, &c); | |
4238 | else if (pi->cmd == P_COMPRESSED_BITMAP) { | |
b411b363 PR |
4239 | /* MAYBE: sanity check that we speak proto >= 90, |
4240 | * and the feature is enabled! */ | |
e658983a | 4241 | struct p_compressed_bm *p = pi->data; |
b411b363 | 4242 | |
50d0b1ad | 4243 | if (pi->size > DRBD_SOCKET_BUFFER_SIZE - drbd_header_size(tconn)) { |
b411b363 | 4244 | dev_err(DEV, "ReportCBitmap packet too large\n"); |
82bc0194 | 4245 | err = -EIO; |
b411b363 PR |
4246 | goto out; |
4247 | } | |
e658983a | 4248 | if (pi->size <= sizeof(*p)) { |
e2857216 | 4249 | dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", pi->size); |
82bc0194 | 4250 | err = -EIO; |
78fcbdae | 4251 | goto out; |
b411b363 | 4252 | } |
e658983a AG |
4253 | err = drbd_recv_all(mdev->tconn, p, pi->size); |
4254 | if (err) | |
4255 | goto out; | |
e2857216 | 4256 | err = decode_bitmap_c(mdev, p, &c, pi->size); |
b411b363 | 4257 | } else { |
e2857216 | 4258 | dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", pi->cmd); |
82bc0194 | 4259 | err = -EIO; |
b411b363 PR |
4260 | goto out; |
4261 | } | |
4262 | ||
e2857216 | 4263 | c.packets[pi->cmd == P_BITMAP]++; |
50d0b1ad | 4264 | c.bytes[pi->cmd == P_BITMAP] += drbd_header_size(tconn) + pi->size; |
b411b363 | 4265 | |
2c46407d AG |
4266 | if (err <= 0) { |
4267 | if (err < 0) | |
4268 | goto out; | |
b411b363 | 4269 | break; |
2c46407d | 4270 | } |
e2857216 | 4271 | err = drbd_recv_header(mdev->tconn, pi); |
82bc0194 | 4272 | if (err) |
b411b363 | 4273 | goto out; |
2c46407d | 4274 | } |
b411b363 PR |
4275 | |
4276 | INFO_bm_xfer_stats(mdev, "receive", &c); | |
4277 | ||
4278 | if (mdev->state.conn == C_WF_BITMAP_T) { | |
de1f8e4a AG |
4279 | enum drbd_state_rv rv; |
4280 | ||
82bc0194 AG |
4281 | err = drbd_send_bitmap(mdev); |
4282 | if (err) | |
b411b363 PR |
4283 | goto out; |
4284 | /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ | |
de1f8e4a AG |
4285 | rv = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); |
4286 | D_ASSERT(rv == SS_SUCCESS); | |
b411b363 PR |
4287 | } else if (mdev->state.conn != C_WF_BITMAP_S) { |
4288 | /* admin may have requested C_DISCONNECTING, | |
4289 | * other threads may have noticed network errors */ | |
4290 | dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n", | |
4291 | drbd_conn_str(mdev->state.conn)); | |
4292 | } | |
82bc0194 | 4293 | err = 0; |
b411b363 | 4294 | |
b411b363 | 4295 | out: |
20ceb2b2 | 4296 | drbd_bm_unlock(mdev); |
82bc0194 | 4297 | if (!err && mdev->state.conn == C_WF_BITMAP_S) |
b411b363 | 4298 | drbd_start_resync(mdev, C_SYNC_SOURCE); |
82bc0194 | 4299 | return err; |
b411b363 PR |
4300 | } |
4301 | ||
4a76b161 | 4302 | static int receive_skip(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4303 | { |
4a76b161 | 4304 | conn_warn(tconn, "skipping unknown optional packet type %d, l: %d!\n", |
e2857216 | 4305 | pi->cmd, pi->size); |
2de876ef | 4306 | |
4a76b161 | 4307 | return ignore_remaining_packet(tconn, pi); |
2de876ef PR |
4308 | } |
4309 | ||
4a76b161 | 4310 | static int receive_UnplugRemote(struct drbd_tconn *tconn, struct packet_info *pi) |
0ced55a3 | 4311 | { |
e7f52dfb LE |
4312 | /* Make sure we've acked all the TCP data associated |
4313 | * with the data requests being unplugged */ | |
4a76b161 | 4314 | drbd_tcp_quickack(tconn->data.socket); |
0ced55a3 | 4315 | |
82bc0194 | 4316 | return 0; |
0ced55a3 PR |
4317 | } |
4318 | ||
4a76b161 | 4319 | static int receive_out_of_sync(struct drbd_tconn *tconn, struct packet_info *pi) |
73a01a18 | 4320 | { |
4a76b161 | 4321 | struct drbd_conf *mdev; |
e658983a | 4322 | struct p_block_desc *p = pi->data; |
4a76b161 AG |
4323 | |
4324 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
4325 | if (!mdev) | |
4326 | return -EIO; | |
73a01a18 | 4327 | |
f735e363 LE |
4328 | switch (mdev->state.conn) { |
4329 | case C_WF_SYNC_UUID: | |
4330 | case C_WF_BITMAP_T: | |
4331 | case C_BEHIND: | |
4332 | break; | |
4333 | default: | |
4334 | dev_err(DEV, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n", | |
4335 | drbd_conn_str(mdev->state.conn)); | |
4336 | } | |
4337 | ||
73a01a18 PR |
4338 | drbd_set_out_of_sync(mdev, be64_to_cpu(p->sector), be32_to_cpu(p->blksize)); |
4339 | ||
82bc0194 | 4340 | return 0; |
73a01a18 PR |
4341 | } |
4342 | ||
02918be2 PR |
4343 | struct data_cmd { |
4344 | int expect_payload; | |
4345 | size_t pkt_size; | |
4a76b161 | 4346 | int (*fn)(struct drbd_tconn *, struct packet_info *); |
02918be2 PR |
4347 | }; |
4348 | ||
4349 | static struct data_cmd drbd_cmd_handler[] = { | |
4a76b161 AG |
4350 | [P_DATA] = { 1, sizeof(struct p_data), receive_Data }, |
4351 | [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply }, | |
4352 | [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } , | |
4353 | [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } , | |
e658983a AG |
4354 | [P_BITMAP] = { 1, 0, receive_bitmap } , |
4355 | [P_COMPRESSED_BITMAP] = { 1, 0, receive_bitmap } , | |
4356 | [P_UNPLUG_REMOTE] = { 0, 0, receive_UnplugRemote }, | |
4a76b161 AG |
4357 | [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, |
4358 | [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, | |
e658983a AG |
4359 | [P_SYNC_PARAM] = { 1, 0, receive_SyncParam }, |
4360 | [P_SYNC_PARAM89] = { 1, 0, receive_SyncParam }, | |
4a76b161 AG |
4361 | [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol }, |
4362 | [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids }, | |
4363 | [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes }, | |
4364 | [P_STATE] = { 0, sizeof(struct p_state), receive_state }, | |
4365 | [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state }, | |
4366 | [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid }, | |
4367 | [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, | |
4368 | [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest }, | |
4369 | [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest }, | |
4370 | [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip }, | |
4371 | [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync }, | |
4372 | [P_CONN_ST_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_conn_state }, | |
036b17ea | 4373 | [P_PROTOCOL_UPDATE] = { 1, sizeof(struct p_protocol), receive_protocol }, |
b411b363 PR |
4374 | }; |
4375 | ||
eefc2f7d | 4376 | static void drbdd(struct drbd_tconn *tconn) |
b411b363 | 4377 | { |
77351055 | 4378 | struct packet_info pi; |
02918be2 | 4379 | size_t shs; /* sub header size */ |
82bc0194 | 4380 | int err; |
b411b363 | 4381 | |
eefc2f7d | 4382 | while (get_t_state(&tconn->receiver) == RUNNING) { |
deebe195 AG |
4383 | struct data_cmd *cmd; |
4384 | ||
eefc2f7d | 4385 | drbd_thread_current_set_cpu(&tconn->receiver); |
69bc7bc3 | 4386 | if (drbd_recv_header(tconn, &pi)) |
02918be2 | 4387 | goto err_out; |
b411b363 | 4388 | |
deebe195 | 4389 | cmd = &drbd_cmd_handler[pi.cmd]; |
4a76b161 | 4390 | if (unlikely(pi.cmd >= ARRAY_SIZE(drbd_cmd_handler) || !cmd->fn)) { |
2fcb8f30 AG |
4391 | conn_err(tconn, "Unexpected data packet %s (0x%04x)", |
4392 | cmdname(pi.cmd), pi.cmd); | |
02918be2 | 4393 | goto err_out; |
0b33a916 | 4394 | } |
b411b363 | 4395 | |
e658983a AG |
4396 | shs = cmd->pkt_size; |
4397 | if (pi.size > shs && !cmd->expect_payload) { | |
2fcb8f30 AG |
4398 | conn_err(tconn, "No payload expected %s l:%d\n", |
4399 | cmdname(pi.cmd), pi.size); | |
02918be2 | 4400 | goto err_out; |
b411b363 | 4401 | } |
b411b363 | 4402 | |
c13f7e1a | 4403 | if (shs) { |
e658983a | 4404 | err = drbd_recv_all_warn(tconn, pi.data, shs); |
a5c31904 | 4405 | if (err) |
c13f7e1a | 4406 | goto err_out; |
e2857216 | 4407 | pi.size -= shs; |
c13f7e1a LE |
4408 | } |
4409 | ||
4a76b161 AG |
4410 | err = cmd->fn(tconn, &pi); |
4411 | if (err) { | |
9f5bdc33 AG |
4412 | conn_err(tconn, "error receiving %s, e: %d l: %d!\n", |
4413 | cmdname(pi.cmd), err, pi.size); | |
02918be2 | 4414 | goto err_out; |
b411b363 PR |
4415 | } |
4416 | } | |
82bc0194 | 4417 | return; |
b411b363 | 4418 | |
82bc0194 AG |
4419 | err_out: |
4420 | conn_request_state(tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); | |
b411b363 PR |
4421 | } |
4422 | ||
0e29d163 | 4423 | void conn_flush_workqueue(struct drbd_tconn *tconn) |
b411b363 PR |
4424 | { |
4425 | struct drbd_wq_barrier barr; | |
4426 | ||
4427 | barr.w.cb = w_prev_work_done; | |
0e29d163 | 4428 | barr.w.tconn = tconn; |
b411b363 | 4429 | init_completion(&barr.done); |
d5b27b01 | 4430 | drbd_queue_work(&tconn->sender_work, &barr.w); |
b411b363 PR |
4431 | wait_for_completion(&barr.done); |
4432 | } | |
4433 | ||
81fa2e67 | 4434 | static void conn_disconnect(struct drbd_tconn *tconn) |
b411b363 | 4435 | { |
c141ebda | 4436 | struct drbd_conf *mdev; |
bbeb641c | 4437 | enum drbd_conns oc; |
376694a0 | 4438 | int vnr; |
b411b363 | 4439 | |
bbeb641c | 4440 | if (tconn->cstate == C_STANDALONE) |
b411b363 | 4441 | return; |
b411b363 | 4442 | |
b8853dbd PR |
4443 | /* We are about to start the cleanup after connection loss. |
4444 | * Make sure drbd_make_request knows about that. | |
4445 | * Usually we should be in some network failure state already, | |
4446 | * but just in case we are not, we fix it up here. | |
4447 | */ | |
4448 | conn_request_state(tconn, NS(conn, C_NETWORK_FAILURE), CS_HARD); | |
4449 | ||
b411b363 | 4450 | /* asender does not clean up anything. it must not interfere, either */ |
360cc740 PR |
4451 | drbd_thread_stop(&tconn->asender); |
4452 | drbd_free_sock(tconn); | |
4453 | ||
c141ebda PR |
4454 | rcu_read_lock(); |
4455 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { | |
4456 | kref_get(&mdev->kref); | |
4457 | rcu_read_unlock(); | |
4458 | drbd_disconnected(mdev); | |
4459 | kref_put(&mdev->kref, &drbd_minor_destroy); | |
4460 | rcu_read_lock(); | |
4461 | } | |
4462 | rcu_read_unlock(); | |
4463 | ||
12038a3a PR |
4464 | if (!list_empty(&tconn->current_epoch->list)) |
4465 | conn_err(tconn, "ASSERTION FAILED: tconn->current_epoch->list not empty\n"); | |
4466 | /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ | |
4467 | atomic_set(&tconn->current_epoch->epoch_size, 0); | |
b6dd1a89 | 4468 | tconn->send.seen_any_write_yet = false; |
12038a3a | 4469 | |
360cc740 PR |
4470 | conn_info(tconn, "Connection closed\n"); |
4471 | ||
cb703454 PR |
4472 | if (conn_highest_role(tconn) == R_PRIMARY && conn_highest_pdsk(tconn) >= D_UNKNOWN) |
4473 | conn_try_outdate_peer_async(tconn); | |
4474 | ||
360cc740 | 4475 | spin_lock_irq(&tconn->req_lock); |
bbeb641c PR |
4476 | oc = tconn->cstate; |
4477 | if (oc >= C_UNCONNECTED) | |
376694a0 | 4478 | _conn_request_state(tconn, NS(conn, C_UNCONNECTED), CS_VERBOSE); |
bbeb641c | 4479 | |
360cc740 PR |
4480 | spin_unlock_irq(&tconn->req_lock); |
4481 | ||
f3dfa40a | 4482 | if (oc == C_DISCONNECTING) |
d9cc6e23 | 4483 | conn_request_state(tconn, NS(conn, C_STANDALONE), CS_VERBOSE | CS_HARD); |
360cc740 PR |
4484 | } |
4485 | ||
c141ebda | 4486 | static int drbd_disconnected(struct drbd_conf *mdev) |
360cc740 | 4487 | { |
360cc740 | 4488 | unsigned int i; |
b411b363 | 4489 | |
85719573 | 4490 | /* wait for current activity to cease. */ |
87eeee41 | 4491 | spin_lock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
4492 | _drbd_wait_ee_list_empty(mdev, &mdev->active_ee); |
4493 | _drbd_wait_ee_list_empty(mdev, &mdev->sync_ee); | |
4494 | _drbd_wait_ee_list_empty(mdev, &mdev->read_ee); | |
87eeee41 | 4495 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
4496 | |
4497 | /* We do not have data structures that would allow us to | |
4498 | * get the rs_pending_cnt down to 0 again. | |
4499 | * * On C_SYNC_TARGET we do not have any data structures describing | |
4500 | * the pending RSDataRequest's we have sent. | |
4501 | * * On C_SYNC_SOURCE there is no data structure that tracks | |
4502 | * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. | |
4503 | * And no, it is not the sum of the reference counts in the | |
4504 | * resync_LRU. The resync_LRU tracks the whole operation including | |
4505 | * the disk-IO, while the rs_pending_cnt only tracks the blocks | |
4506 | * on the fly. */ | |
4507 | drbd_rs_cancel_all(mdev); | |
4508 | mdev->rs_total = 0; | |
4509 | mdev->rs_failed = 0; | |
4510 | atomic_set(&mdev->rs_pending_cnt, 0); | |
4511 | wake_up(&mdev->misc_wait); | |
4512 | ||
b411b363 | 4513 | del_timer_sync(&mdev->resync_timer); |
b411b363 PR |
4514 | resync_timer_fn((unsigned long)mdev); |
4515 | ||
b411b363 PR |
4516 | /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, |
4517 | * w_make_resync_request etc. which may still be on the worker queue | |
4518 | * to be "canceled" */ | |
a21e9298 | 4519 | drbd_flush_workqueue(mdev); |
b411b363 | 4520 | |
a990be46 | 4521 | drbd_finish_peer_reqs(mdev); |
b411b363 | 4522 | |
d10b4ea3 PR |
4523 | /* This second workqueue flush is necessary, since drbd_finish_peer_reqs() |
4524 | might have issued a work again. The one before drbd_finish_peer_reqs() is | |
4525 | necessary to reclain net_ee in drbd_finish_peer_reqs(). */ | |
4526 | drbd_flush_workqueue(mdev); | |
4527 | ||
b411b363 PR |
4528 | kfree(mdev->p_uuid); |
4529 | mdev->p_uuid = NULL; | |
4530 | ||
2aebfabb | 4531 | if (!drbd_suspended(mdev)) |
2f5cdd0b | 4532 | tl_clear(mdev->tconn); |
b411b363 | 4533 | |
b411b363 PR |
4534 | drbd_md_sync(mdev); |
4535 | ||
20ceb2b2 LE |
4536 | /* serialize with bitmap writeout triggered by the state change, |
4537 | * if any. */ | |
4538 | wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags)); | |
4539 | ||
b411b363 PR |
4540 | /* tcp_close and release of sendpage pages can be deferred. I don't |
4541 | * want to use SO_LINGER, because apparently it can be deferred for | |
4542 | * more than 20 seconds (longest time I checked). | |
4543 | * | |
4544 | * Actually we don't care for exactly when the network stack does its | |
4545 | * put_page(), but release our reference on these pages right here. | |
4546 | */ | |
7721f567 | 4547 | i = drbd_free_peer_reqs(mdev, &mdev->net_ee); |
b411b363 PR |
4548 | if (i) |
4549 | dev_info(DEV, "net_ee not empty, killed %u entries\n", i); | |
435f0740 LE |
4550 | i = atomic_read(&mdev->pp_in_use_by_net); |
4551 | if (i) | |
4552 | dev_info(DEV, "pp_in_use_by_net = %d, expected 0\n", i); | |
b411b363 PR |
4553 | i = atomic_read(&mdev->pp_in_use); |
4554 | if (i) | |
45bb912b | 4555 | dev_info(DEV, "pp_in_use = %d, expected 0\n", i); |
b411b363 PR |
4556 | |
4557 | D_ASSERT(list_empty(&mdev->read_ee)); | |
4558 | D_ASSERT(list_empty(&mdev->active_ee)); | |
4559 | D_ASSERT(list_empty(&mdev->sync_ee)); | |
4560 | D_ASSERT(list_empty(&mdev->done_ee)); | |
4561 | ||
360cc740 | 4562 | return 0; |
b411b363 PR |
4563 | } |
4564 | ||
4565 | /* | |
4566 | * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version | |
4567 | * we can agree on is stored in agreed_pro_version. | |
4568 | * | |
4569 | * feature flags and the reserved array should be enough room for future | |
4570 | * enhancements of the handshake protocol, and possible plugins... | |
4571 | * | |
4572 | * for now, they are expected to be zero, but ignored. | |
4573 | */ | |
6038178e | 4574 | static int drbd_send_features(struct drbd_tconn *tconn) |
b411b363 | 4575 | { |
9f5bdc33 AG |
4576 | struct drbd_socket *sock; |
4577 | struct p_connection_features *p; | |
b411b363 | 4578 | |
9f5bdc33 AG |
4579 | sock = &tconn->data; |
4580 | p = conn_prepare_command(tconn, sock); | |
4581 | if (!p) | |
e8d17b01 | 4582 | return -EIO; |
b411b363 PR |
4583 | memset(p, 0, sizeof(*p)); |
4584 | p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); | |
4585 | p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); | |
9f5bdc33 | 4586 | return conn_send_command(tconn, sock, P_CONNECTION_FEATURES, sizeof(*p), NULL, 0); |
b411b363 PR |
4587 | } |
4588 | ||
4589 | /* | |
4590 | * return values: | |
4591 | * 1 yes, we have a valid connection | |
4592 | * 0 oops, did not work out, please try again | |
4593 | * -1 peer talks different language, | |
4594 | * no point in trying again, please go standalone. | |
4595 | */ | |
6038178e | 4596 | static int drbd_do_features(struct drbd_tconn *tconn) |
b411b363 | 4597 | { |
65d11ed6 | 4598 | /* ASSERT current == tconn->receiver ... */ |
e658983a AG |
4599 | struct p_connection_features *p; |
4600 | const int expect = sizeof(struct p_connection_features); | |
77351055 | 4601 | struct packet_info pi; |
a5c31904 | 4602 | int err; |
b411b363 | 4603 | |
6038178e | 4604 | err = drbd_send_features(tconn); |
e8d17b01 | 4605 | if (err) |
b411b363 PR |
4606 | return 0; |
4607 | ||
69bc7bc3 AG |
4608 | err = drbd_recv_header(tconn, &pi); |
4609 | if (err) | |
b411b363 PR |
4610 | return 0; |
4611 | ||
6038178e AG |
4612 | if (pi.cmd != P_CONNECTION_FEATURES) { |
4613 | conn_err(tconn, "expected ConnectionFeatures packet, received: %s (0x%04x)\n", | |
2fcb8f30 | 4614 | cmdname(pi.cmd), pi.cmd); |
b411b363 PR |
4615 | return -1; |
4616 | } | |
4617 | ||
77351055 | 4618 | if (pi.size != expect) { |
6038178e | 4619 | conn_err(tconn, "expected ConnectionFeatures length: %u, received: %u\n", |
77351055 | 4620 | expect, pi.size); |
b411b363 PR |
4621 | return -1; |
4622 | } | |
4623 | ||
e658983a AG |
4624 | p = pi.data; |
4625 | err = drbd_recv_all_warn(tconn, p, expect); | |
a5c31904 | 4626 | if (err) |
b411b363 | 4627 | return 0; |
b411b363 | 4628 | |
b411b363 PR |
4629 | p->protocol_min = be32_to_cpu(p->protocol_min); |
4630 | p->protocol_max = be32_to_cpu(p->protocol_max); | |
4631 | if (p->protocol_max == 0) | |
4632 | p->protocol_max = p->protocol_min; | |
4633 | ||
4634 | if (PRO_VERSION_MAX < p->protocol_min || | |
4635 | PRO_VERSION_MIN > p->protocol_max) | |
4636 | goto incompat; | |
4637 | ||
65d11ed6 | 4638 | tconn->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); |
b411b363 | 4639 | |
65d11ed6 PR |
4640 | conn_info(tconn, "Handshake successful: " |
4641 | "Agreed network protocol version %d\n", tconn->agreed_pro_version); | |
b411b363 PR |
4642 | |
4643 | return 1; | |
4644 | ||
4645 | incompat: | |
65d11ed6 | 4646 | conn_err(tconn, "incompatible DRBD dialects: " |
b411b363 PR |
4647 | "I support %d-%d, peer supports %d-%d\n", |
4648 | PRO_VERSION_MIN, PRO_VERSION_MAX, | |
4649 | p->protocol_min, p->protocol_max); | |
4650 | return -1; | |
4651 | } | |
4652 | ||
4653 | #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) | |
13e6037d | 4654 | static int drbd_do_auth(struct drbd_tconn *tconn) |
b411b363 PR |
4655 | { |
4656 | dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); | |
4657 | dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); | |
b10d96cb | 4658 | return -1; |
b411b363 PR |
4659 | } |
4660 | #else | |
4661 | #define CHALLENGE_LEN 64 | |
b10d96cb JT |
4662 | |
4663 | /* Return value: | |
4664 | 1 - auth succeeded, | |
4665 | 0 - failed, try again (network error), | |
4666 | -1 - auth failed, don't try again. | |
4667 | */ | |
4668 | ||
13e6037d | 4669 | static int drbd_do_auth(struct drbd_tconn *tconn) |
b411b363 | 4670 | { |
9f5bdc33 | 4671 | struct drbd_socket *sock; |
b411b363 PR |
4672 | char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ |
4673 | struct scatterlist sg; | |
4674 | char *response = NULL; | |
4675 | char *right_response = NULL; | |
4676 | char *peers_ch = NULL; | |
44ed167d PR |
4677 | unsigned int key_len; |
4678 | char secret[SHARED_SECRET_MAX]; /* 64 byte */ | |
b411b363 PR |
4679 | unsigned int resp_size; |
4680 | struct hash_desc desc; | |
77351055 | 4681 | struct packet_info pi; |
44ed167d | 4682 | struct net_conf *nc; |
69bc7bc3 | 4683 | int err, rv; |
b411b363 | 4684 | |
9f5bdc33 AG |
4685 | /* FIXME: Put the challenge/response into the preallocated socket buffer. */ |
4686 | ||
44ed167d PR |
4687 | rcu_read_lock(); |
4688 | nc = rcu_dereference(tconn->net_conf); | |
4689 | key_len = strlen(nc->shared_secret); | |
4690 | memcpy(secret, nc->shared_secret, key_len); | |
4691 | rcu_read_unlock(); | |
4692 | ||
13e6037d | 4693 | desc.tfm = tconn->cram_hmac_tfm; |
b411b363 PR |
4694 | desc.flags = 0; |
4695 | ||
44ed167d | 4696 | rv = crypto_hash_setkey(tconn->cram_hmac_tfm, (u8 *)secret, key_len); |
b411b363 | 4697 | if (rv) { |
13e6037d | 4698 | conn_err(tconn, "crypto_hash_setkey() failed with %d\n", rv); |
b10d96cb | 4699 | rv = -1; |
b411b363 PR |
4700 | goto fail; |
4701 | } | |
4702 | ||
4703 | get_random_bytes(my_challenge, CHALLENGE_LEN); | |
4704 | ||
9f5bdc33 AG |
4705 | sock = &tconn->data; |
4706 | if (!conn_prepare_command(tconn, sock)) { | |
4707 | rv = 0; | |
4708 | goto fail; | |
4709 | } | |
e658983a | 4710 | rv = !conn_send_command(tconn, sock, P_AUTH_CHALLENGE, 0, |
9f5bdc33 | 4711 | my_challenge, CHALLENGE_LEN); |
b411b363 PR |
4712 | if (!rv) |
4713 | goto fail; | |
4714 | ||
69bc7bc3 AG |
4715 | err = drbd_recv_header(tconn, &pi); |
4716 | if (err) { | |
4717 | rv = 0; | |
b411b363 | 4718 | goto fail; |
69bc7bc3 | 4719 | } |
b411b363 | 4720 | |
77351055 | 4721 | if (pi.cmd != P_AUTH_CHALLENGE) { |
13e6037d | 4722 | conn_err(tconn, "expected AuthChallenge packet, received: %s (0x%04x)\n", |
2fcb8f30 | 4723 | cmdname(pi.cmd), pi.cmd); |
b411b363 PR |
4724 | rv = 0; |
4725 | goto fail; | |
4726 | } | |
4727 | ||
77351055 | 4728 | if (pi.size > CHALLENGE_LEN * 2) { |
13e6037d | 4729 | conn_err(tconn, "expected AuthChallenge payload too big.\n"); |
b10d96cb | 4730 | rv = -1; |
b411b363 PR |
4731 | goto fail; |
4732 | } | |
4733 | ||
77351055 | 4734 | peers_ch = kmalloc(pi.size, GFP_NOIO); |
b411b363 | 4735 | if (peers_ch == NULL) { |
13e6037d | 4736 | conn_err(tconn, "kmalloc of peers_ch failed\n"); |
b10d96cb | 4737 | rv = -1; |
b411b363 PR |
4738 | goto fail; |
4739 | } | |
4740 | ||
a5c31904 AG |
4741 | err = drbd_recv_all_warn(tconn, peers_ch, pi.size); |
4742 | if (err) { | |
b411b363 PR |
4743 | rv = 0; |
4744 | goto fail; | |
4745 | } | |
4746 | ||
13e6037d | 4747 | resp_size = crypto_hash_digestsize(tconn->cram_hmac_tfm); |
b411b363 PR |
4748 | response = kmalloc(resp_size, GFP_NOIO); |
4749 | if (response == NULL) { | |
13e6037d | 4750 | conn_err(tconn, "kmalloc of response failed\n"); |
b10d96cb | 4751 | rv = -1; |
b411b363 PR |
4752 | goto fail; |
4753 | } | |
4754 | ||
4755 | sg_init_table(&sg, 1); | |
77351055 | 4756 | sg_set_buf(&sg, peers_ch, pi.size); |
b411b363 PR |
4757 | |
4758 | rv = crypto_hash_digest(&desc, &sg, sg.length, response); | |
4759 | if (rv) { | |
13e6037d | 4760 | conn_err(tconn, "crypto_hash_digest() failed with %d\n", rv); |
b10d96cb | 4761 | rv = -1; |
b411b363 PR |
4762 | goto fail; |
4763 | } | |
4764 | ||
9f5bdc33 AG |
4765 | if (!conn_prepare_command(tconn, sock)) { |
4766 | rv = 0; | |
4767 | goto fail; | |
4768 | } | |
e658983a | 4769 | rv = !conn_send_command(tconn, sock, P_AUTH_RESPONSE, 0, |
9f5bdc33 | 4770 | response, resp_size); |
b411b363 PR |
4771 | if (!rv) |
4772 | goto fail; | |
4773 | ||
69bc7bc3 AG |
4774 | err = drbd_recv_header(tconn, &pi); |
4775 | if (err) { | |
4776 | rv = 0; | |
b411b363 | 4777 | goto fail; |
69bc7bc3 | 4778 | } |
b411b363 | 4779 | |
77351055 | 4780 | if (pi.cmd != P_AUTH_RESPONSE) { |
13e6037d | 4781 | conn_err(tconn, "expected AuthResponse packet, received: %s (0x%04x)\n", |
2fcb8f30 | 4782 | cmdname(pi.cmd), pi.cmd); |
b411b363 PR |
4783 | rv = 0; |
4784 | goto fail; | |
4785 | } | |
4786 | ||
77351055 | 4787 | if (pi.size != resp_size) { |
13e6037d | 4788 | conn_err(tconn, "expected AuthResponse payload of wrong size\n"); |
b411b363 PR |
4789 | rv = 0; |
4790 | goto fail; | |
4791 | } | |
4792 | ||
a5c31904 AG |
4793 | err = drbd_recv_all_warn(tconn, response , resp_size); |
4794 | if (err) { | |
b411b363 PR |
4795 | rv = 0; |
4796 | goto fail; | |
4797 | } | |
4798 | ||
4799 | right_response = kmalloc(resp_size, GFP_NOIO); | |
2d1ee87d | 4800 | if (right_response == NULL) { |
13e6037d | 4801 | conn_err(tconn, "kmalloc of right_response failed\n"); |
b10d96cb | 4802 | rv = -1; |
b411b363 PR |
4803 | goto fail; |
4804 | } | |
4805 | ||
4806 | sg_set_buf(&sg, my_challenge, CHALLENGE_LEN); | |
4807 | ||
4808 | rv = crypto_hash_digest(&desc, &sg, sg.length, right_response); | |
4809 | if (rv) { | |
13e6037d | 4810 | conn_err(tconn, "crypto_hash_digest() failed with %d\n", rv); |
b10d96cb | 4811 | rv = -1; |
b411b363 PR |
4812 | goto fail; |
4813 | } | |
4814 | ||
4815 | rv = !memcmp(response, right_response, resp_size); | |
4816 | ||
4817 | if (rv) | |
44ed167d PR |
4818 | conn_info(tconn, "Peer authenticated using %d bytes HMAC\n", |
4819 | resp_size); | |
b10d96cb JT |
4820 | else |
4821 | rv = -1; | |
b411b363 PR |
4822 | |
4823 | fail: | |
4824 | kfree(peers_ch); | |
4825 | kfree(response); | |
4826 | kfree(right_response); | |
4827 | ||
4828 | return rv; | |
4829 | } | |
4830 | #endif | |
4831 | ||
4832 | int drbdd_init(struct drbd_thread *thi) | |
4833 | { | |
392c8801 | 4834 | struct drbd_tconn *tconn = thi->tconn; |
b411b363 PR |
4835 | int h; |
4836 | ||
4d641dd7 | 4837 | conn_info(tconn, "receiver (re)started\n"); |
b411b363 PR |
4838 | |
4839 | do { | |
81fa2e67 | 4840 | h = conn_connect(tconn); |
b411b363 | 4841 | if (h == 0) { |
81fa2e67 | 4842 | conn_disconnect(tconn); |
20ee6390 | 4843 | schedule_timeout_interruptible(HZ); |
b411b363 PR |
4844 | } |
4845 | if (h == -1) { | |
4d641dd7 | 4846 | conn_warn(tconn, "Discarding network configuration.\n"); |
bbeb641c | 4847 | conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 PR |
4848 | } |
4849 | } while (h == 0); | |
4850 | ||
91fd4dad PR |
4851 | if (h > 0) |
4852 | drbdd(tconn); | |
b411b363 | 4853 | |
81fa2e67 | 4854 | conn_disconnect(tconn); |
b411b363 | 4855 | |
4d641dd7 | 4856 | conn_info(tconn, "receiver terminated\n"); |
b411b363 PR |
4857 | return 0; |
4858 | } | |
4859 | ||
4860 | /* ********* acknowledge sender ******** */ | |
4861 | ||
e05e1e59 | 4862 | static int got_conn_RqSReply(struct drbd_tconn *tconn, struct packet_info *pi) |
e4f78ede | 4863 | { |
e658983a | 4864 | struct p_req_state_reply *p = pi->data; |
e4f78ede PR |
4865 | int retcode = be32_to_cpu(p->retcode); |
4866 | ||
4867 | if (retcode >= SS_SUCCESS) { | |
4868 | set_bit(CONN_WD_ST_CHG_OKAY, &tconn->flags); | |
4869 | } else { | |
4870 | set_bit(CONN_WD_ST_CHG_FAIL, &tconn->flags); | |
4871 | conn_err(tconn, "Requested state change failed by peer: %s (%d)\n", | |
4872 | drbd_set_st_err_str(retcode), retcode); | |
4873 | } | |
4874 | wake_up(&tconn->ping_wait); | |
4875 | ||
2735a594 | 4876 | return 0; |
e4f78ede PR |
4877 | } |
4878 | ||
1952e916 | 4879 | static int got_RqSReply(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4880 | { |
1952e916 | 4881 | struct drbd_conf *mdev; |
e658983a | 4882 | struct p_req_state_reply *p = pi->data; |
b411b363 PR |
4883 | int retcode = be32_to_cpu(p->retcode); |
4884 | ||
1952e916 AG |
4885 | mdev = vnr_to_mdev(tconn, pi->vnr); |
4886 | if (!mdev) | |
2735a594 | 4887 | return -EIO; |
1952e916 | 4888 | |
4d0fc3fd PR |
4889 | if (test_bit(CONN_WD_ST_CHG_REQ, &tconn->flags)) { |
4890 | D_ASSERT(tconn->agreed_pro_version < 100); | |
4891 | return got_conn_RqSReply(tconn, pi); | |
4892 | } | |
4893 | ||
e4f78ede PR |
4894 | if (retcode >= SS_SUCCESS) { |
4895 | set_bit(CL_ST_CHG_SUCCESS, &mdev->flags); | |
4896 | } else { | |
4897 | set_bit(CL_ST_CHG_FAIL, &mdev->flags); | |
4898 | dev_err(DEV, "Requested state change failed by peer: %s (%d)\n", | |
4899 | drbd_set_st_err_str(retcode), retcode); | |
b411b363 | 4900 | } |
e4f78ede PR |
4901 | wake_up(&mdev->state_wait); |
4902 | ||
2735a594 | 4903 | return 0; |
b411b363 PR |
4904 | } |
4905 | ||
e05e1e59 | 4906 | static int got_Ping(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4907 | { |
2735a594 | 4908 | return drbd_send_ping_ack(tconn); |
b411b363 PR |
4909 | |
4910 | } | |
4911 | ||
e05e1e59 | 4912 | static int got_PingAck(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 PR |
4913 | { |
4914 | /* restore idle timeout */ | |
2a67d8b9 PR |
4915 | tconn->meta.socket->sk->sk_rcvtimeo = tconn->net_conf->ping_int*HZ; |
4916 | if (!test_and_set_bit(GOT_PING_ACK, &tconn->flags)) | |
4917 | wake_up(&tconn->ping_wait); | |
b411b363 | 4918 | |
2735a594 | 4919 | return 0; |
b411b363 PR |
4920 | } |
4921 | ||
1952e916 | 4922 | static int got_IsInSync(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4923 | { |
1952e916 | 4924 | struct drbd_conf *mdev; |
e658983a | 4925 | struct p_block_ack *p = pi->data; |
b411b363 PR |
4926 | sector_t sector = be64_to_cpu(p->sector); |
4927 | int blksize = be32_to_cpu(p->blksize); | |
4928 | ||
1952e916 AG |
4929 | mdev = vnr_to_mdev(tconn, pi->vnr); |
4930 | if (!mdev) | |
2735a594 | 4931 | return -EIO; |
1952e916 | 4932 | |
31890f4a | 4933 | D_ASSERT(mdev->tconn->agreed_pro_version >= 89); |
b411b363 PR |
4934 | |
4935 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
4936 | ||
1d53f09e LE |
4937 | if (get_ldev(mdev)) { |
4938 | drbd_rs_complete_io(mdev, sector); | |
4939 | drbd_set_in_sync(mdev, sector, blksize); | |
4940 | /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ | |
4941 | mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); | |
4942 | put_ldev(mdev); | |
4943 | } | |
b411b363 | 4944 | dec_rs_pending(mdev); |
778f271d | 4945 | atomic_add(blksize >> 9, &mdev->rs_sect_in); |
b411b363 | 4946 | |
2735a594 | 4947 | return 0; |
b411b363 PR |
4948 | } |
4949 | ||
bc9c5c41 AG |
4950 | static int |
4951 | validate_req_change_req_state(struct drbd_conf *mdev, u64 id, sector_t sector, | |
4952 | struct rb_root *root, const char *func, | |
4953 | enum drbd_req_event what, bool missing_ok) | |
b411b363 PR |
4954 | { |
4955 | struct drbd_request *req; | |
4956 | struct bio_and_error m; | |
4957 | ||
87eeee41 | 4958 | spin_lock_irq(&mdev->tconn->req_lock); |
bc9c5c41 | 4959 | req = find_request(mdev, root, id, sector, missing_ok, func); |
b411b363 | 4960 | if (unlikely(!req)) { |
87eeee41 | 4961 | spin_unlock_irq(&mdev->tconn->req_lock); |
85997675 | 4962 | return -EIO; |
b411b363 PR |
4963 | } |
4964 | __req_mod(req, what, &m); | |
87eeee41 | 4965 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
4966 | |
4967 | if (m.bio) | |
4968 | complete_master_bio(mdev, &m); | |
85997675 | 4969 | return 0; |
b411b363 PR |
4970 | } |
4971 | ||
1952e916 | 4972 | static int got_BlockAck(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 4973 | { |
1952e916 | 4974 | struct drbd_conf *mdev; |
e658983a | 4975 | struct p_block_ack *p = pi->data; |
b411b363 PR |
4976 | sector_t sector = be64_to_cpu(p->sector); |
4977 | int blksize = be32_to_cpu(p->blksize); | |
4978 | enum drbd_req_event what; | |
4979 | ||
1952e916 AG |
4980 | mdev = vnr_to_mdev(tconn, pi->vnr); |
4981 | if (!mdev) | |
2735a594 | 4982 | return -EIO; |
1952e916 | 4983 | |
b411b363 PR |
4984 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); |
4985 | ||
579b57ed | 4986 | if (p->block_id == ID_SYNCER) { |
b411b363 PR |
4987 | drbd_set_in_sync(mdev, sector, blksize); |
4988 | dec_rs_pending(mdev); | |
2735a594 | 4989 | return 0; |
b411b363 | 4990 | } |
e05e1e59 | 4991 | switch (pi->cmd) { |
b411b363 | 4992 | case P_RS_WRITE_ACK: |
8554df1c | 4993 | what = WRITE_ACKED_BY_PEER_AND_SIS; |
b411b363 PR |
4994 | break; |
4995 | case P_WRITE_ACK: | |
8554df1c | 4996 | what = WRITE_ACKED_BY_PEER; |
b411b363 PR |
4997 | break; |
4998 | case P_RECV_ACK: | |
8554df1c | 4999 | what = RECV_ACKED_BY_PEER; |
b411b363 | 5000 | break; |
7be8da07 | 5001 | case P_DISCARD_WRITE: |
7be8da07 AG |
5002 | what = DISCARD_WRITE; |
5003 | break; | |
5004 | case P_RETRY_WRITE: | |
7be8da07 | 5005 | what = POSTPONE_WRITE; |
b411b363 PR |
5006 | break; |
5007 | default: | |
2735a594 | 5008 | BUG(); |
b411b363 PR |
5009 | } |
5010 | ||
2735a594 AG |
5011 | return validate_req_change_req_state(mdev, p->block_id, sector, |
5012 | &mdev->write_requests, __func__, | |
5013 | what, false); | |
b411b363 PR |
5014 | } |
5015 | ||
1952e916 | 5016 | static int got_NegAck(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 5017 | { |
1952e916 | 5018 | struct drbd_conf *mdev; |
e658983a | 5019 | struct p_block_ack *p = pi->data; |
b411b363 | 5020 | sector_t sector = be64_to_cpu(p->sector); |
2deb8336 | 5021 | int size = be32_to_cpu(p->blksize); |
85997675 | 5022 | int err; |
b411b363 | 5023 | |
1952e916 AG |
5024 | mdev = vnr_to_mdev(tconn, pi->vnr); |
5025 | if (!mdev) | |
2735a594 | 5026 | return -EIO; |
1952e916 | 5027 | |
b411b363 PR |
5028 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); |
5029 | ||
579b57ed | 5030 | if (p->block_id == ID_SYNCER) { |
b411b363 PR |
5031 | dec_rs_pending(mdev); |
5032 | drbd_rs_failed_io(mdev, sector, size); | |
2735a594 | 5033 | return 0; |
b411b363 | 5034 | } |
2deb8336 | 5035 | |
85997675 AG |
5036 | err = validate_req_change_req_state(mdev, p->block_id, sector, |
5037 | &mdev->write_requests, __func__, | |
303d1448 | 5038 | NEG_ACKED, true); |
85997675 | 5039 | if (err) { |
c3afd8f5 AG |
5040 | /* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs. |
5041 | The master bio might already be completed, therefore the | |
5042 | request is no longer in the collision hash. */ | |
5043 | /* In Protocol B we might already have got a P_RECV_ACK | |
5044 | but then get a P_NEG_ACK afterwards. */ | |
c3afd8f5 | 5045 | drbd_set_out_of_sync(mdev, sector, size); |
2deb8336 | 5046 | } |
2735a594 | 5047 | return 0; |
b411b363 PR |
5048 | } |
5049 | ||
1952e916 | 5050 | static int got_NegDReply(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 5051 | { |
1952e916 | 5052 | struct drbd_conf *mdev; |
e658983a | 5053 | struct p_block_ack *p = pi->data; |
b411b363 PR |
5054 | sector_t sector = be64_to_cpu(p->sector); |
5055 | ||
1952e916 AG |
5056 | mdev = vnr_to_mdev(tconn, pi->vnr); |
5057 | if (!mdev) | |
2735a594 | 5058 | return -EIO; |
1952e916 | 5059 | |
b411b363 | 5060 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); |
7be8da07 | 5061 | |
380207d0 | 5062 | dev_err(DEV, "Got NegDReply; Sector %llus, len %u.\n", |
b411b363 PR |
5063 | (unsigned long long)sector, be32_to_cpu(p->blksize)); |
5064 | ||
2735a594 AG |
5065 | return validate_req_change_req_state(mdev, p->block_id, sector, |
5066 | &mdev->read_requests, __func__, | |
5067 | NEG_ACKED, false); | |
b411b363 PR |
5068 | } |
5069 | ||
1952e916 | 5070 | static int got_NegRSDReply(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 5071 | { |
1952e916 | 5072 | struct drbd_conf *mdev; |
b411b363 PR |
5073 | sector_t sector; |
5074 | int size; | |
e658983a | 5075 | struct p_block_ack *p = pi->data; |
1952e916 AG |
5076 | |
5077 | mdev = vnr_to_mdev(tconn, pi->vnr); | |
5078 | if (!mdev) | |
2735a594 | 5079 | return -EIO; |
b411b363 PR |
5080 | |
5081 | sector = be64_to_cpu(p->sector); | |
5082 | size = be32_to_cpu(p->blksize); | |
b411b363 PR |
5083 | |
5084 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
5085 | ||
5086 | dec_rs_pending(mdev); | |
5087 | ||
5088 | if (get_ldev_if_state(mdev, D_FAILED)) { | |
5089 | drbd_rs_complete_io(mdev, sector); | |
e05e1e59 | 5090 | switch (pi->cmd) { |
d612d309 PR |
5091 | case P_NEG_RS_DREPLY: |
5092 | drbd_rs_failed_io(mdev, sector, size); | |
5093 | case P_RS_CANCEL: | |
5094 | break; | |
5095 | default: | |
2735a594 | 5096 | BUG(); |
d612d309 | 5097 | } |
b411b363 PR |
5098 | put_ldev(mdev); |
5099 | } | |
5100 | ||
2735a594 | 5101 | return 0; |
b411b363 PR |
5102 | } |
5103 | ||
1952e916 | 5104 | static int got_BarrierAck(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 5105 | { |
e658983a | 5106 | struct p_barrier_ack *p = pi->data; |
9ed57dcb LE |
5107 | struct drbd_conf *mdev; |
5108 | int vnr; | |
1952e916 | 5109 | |
9ed57dcb | 5110 | tl_release(tconn, p->barrier, be32_to_cpu(p->set_size)); |
b411b363 | 5111 | |
9ed57dcb LE |
5112 | rcu_read_lock(); |
5113 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { | |
5114 | if (mdev->state.conn == C_AHEAD && | |
5115 | atomic_read(&mdev->ap_in_flight) == 0 && | |
5116 | !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &mdev->flags)) { | |
5117 | mdev->start_resync_timer.expires = jiffies + HZ; | |
5118 | add_timer(&mdev->start_resync_timer); | |
5119 | } | |
c4752ef1 | 5120 | } |
9ed57dcb | 5121 | rcu_read_unlock(); |
c4752ef1 | 5122 | |
2735a594 | 5123 | return 0; |
b411b363 PR |
5124 | } |
5125 | ||
1952e916 | 5126 | static int got_OVResult(struct drbd_tconn *tconn, struct packet_info *pi) |
b411b363 | 5127 | { |
1952e916 | 5128 | struct drbd_conf *mdev; |
e658983a | 5129 | struct p_block_ack *p = pi->data; |
b411b363 PR |
5130 | struct drbd_work *w; |
5131 | sector_t sector; | |
5132 | int size; | |
5133 | ||
1952e916 AG |
5134 | mdev = vnr_to_mdev(tconn, pi->vnr); |
5135 | if (!mdev) | |
2735a594 | 5136 | return -EIO; |
1952e916 | 5137 | |
b411b363 PR |
5138 | sector = be64_to_cpu(p->sector); |
5139 | size = be32_to_cpu(p->blksize); | |
5140 | ||
5141 | update_peer_seq(mdev, be32_to_cpu(p->seq_num)); | |
5142 | ||
5143 | if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) | |
8f7bed77 | 5144 | drbd_ov_out_of_sync_found(mdev, sector, size); |
b411b363 | 5145 | else |
8f7bed77 | 5146 | ov_out_of_sync_print(mdev); |
b411b363 | 5147 | |
1d53f09e | 5148 | if (!get_ldev(mdev)) |
2735a594 | 5149 | return 0; |
1d53f09e | 5150 | |
b411b363 PR |
5151 | drbd_rs_complete_io(mdev, sector); |
5152 | dec_rs_pending(mdev); | |
5153 | ||
ea5442af LE |
5154 | --mdev->ov_left; |
5155 | ||
5156 | /* let's advance progress step marks only for every other megabyte */ | |
5157 | if ((mdev->ov_left & 0x200) == 0x200) | |
5158 | drbd_advance_rs_marks(mdev, mdev->ov_left); | |
5159 | ||
5160 | if (mdev->ov_left == 0) { | |
b411b363 PR |
5161 | w = kmalloc(sizeof(*w), GFP_NOIO); |
5162 | if (w) { | |
5163 | w->cb = w_ov_finished; | |
a21e9298 | 5164 | w->mdev = mdev; |
d5b27b01 | 5165 | drbd_queue_work(&mdev->tconn->sender_work, w); |
b411b363 PR |
5166 | } else { |
5167 | dev_err(DEV, "kmalloc(w) failed."); | |
8f7bed77 | 5168 | ov_out_of_sync_print(mdev); |
b411b363 PR |
5169 | drbd_resync_finished(mdev); |
5170 | } | |
5171 | } | |
1d53f09e | 5172 | put_ldev(mdev); |
2735a594 | 5173 | return 0; |
b411b363 PR |
5174 | } |
5175 | ||
1952e916 | 5176 | static int got_skip(struct drbd_tconn *tconn, struct packet_info *pi) |
0ced55a3 | 5177 | { |
2735a594 | 5178 | return 0; |
0ced55a3 PR |
5179 | } |
5180 | ||
a990be46 | 5181 | static int tconn_finish_peer_reqs(struct drbd_tconn *tconn) |
32862ec7 | 5182 | { |
082a3439 | 5183 | struct drbd_conf *mdev; |
c141ebda | 5184 | int vnr, not_empty = 0; |
32862ec7 PR |
5185 | |
5186 | do { | |
5187 | clear_bit(SIGNAL_ASENDER, &tconn->flags); | |
5188 | flush_signals(current); | |
c141ebda PR |
5189 | |
5190 | rcu_read_lock(); | |
5191 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { | |
5192 | kref_get(&mdev->kref); | |
5193 | rcu_read_unlock(); | |
d3fcb490 | 5194 | if (drbd_finish_peer_reqs(mdev)) { |
c141ebda PR |
5195 | kref_put(&mdev->kref, &drbd_minor_destroy); |
5196 | return 1; | |
d3fcb490 | 5197 | } |
c141ebda PR |
5198 | kref_put(&mdev->kref, &drbd_minor_destroy); |
5199 | rcu_read_lock(); | |
082a3439 | 5200 | } |
32862ec7 | 5201 | set_bit(SIGNAL_ASENDER, &tconn->flags); |
082a3439 PR |
5202 | |
5203 | spin_lock_irq(&tconn->req_lock); | |
c141ebda | 5204 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { |
082a3439 PR |
5205 | not_empty = !list_empty(&mdev->done_ee); |
5206 | if (not_empty) | |
5207 | break; | |
5208 | } | |
5209 | spin_unlock_irq(&tconn->req_lock); | |
c141ebda | 5210 | rcu_read_unlock(); |
32862ec7 PR |
5211 | } while (not_empty); |
5212 | ||
5213 | return 0; | |
5214 | } | |
5215 | ||
7201b972 AG |
5216 | struct asender_cmd { |
5217 | size_t pkt_size; | |
1952e916 | 5218 | int (*fn)(struct drbd_tconn *tconn, struct packet_info *); |
7201b972 AG |
5219 | }; |
5220 | ||
5221 | static struct asender_cmd asender_tbl[] = { | |
e658983a AG |
5222 | [P_PING] = { 0, got_Ping }, |
5223 | [P_PING_ACK] = { 0, got_PingAck }, | |
1952e916 AG |
5224 | [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, |
5225 | [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, | |
5226 | [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, | |
5227 | [P_DISCARD_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, | |
5228 | [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, | |
5229 | [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, | |
5230 | [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply }, | |
5231 | [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, | |
5232 | [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, | |
5233 | [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, | |
5234 | [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, | |
5235 | [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip }, | |
5236 | [P_RS_CANCEL] = { sizeof(struct p_block_ack), got_NegRSDReply }, | |
5237 | [P_CONN_ST_CHG_REPLY]={ sizeof(struct p_req_state_reply), got_conn_RqSReply }, | |
5238 | [P_RETRY_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, | |
7201b972 AG |
5239 | }; |
5240 | ||
b411b363 PR |
5241 | int drbd_asender(struct drbd_thread *thi) |
5242 | { | |
392c8801 | 5243 | struct drbd_tconn *tconn = thi->tconn; |
b411b363 | 5244 | struct asender_cmd *cmd = NULL; |
77351055 | 5245 | struct packet_info pi; |
257d0af6 | 5246 | int rv; |
e658983a | 5247 | void *buf = tconn->meta.rbuf; |
b411b363 | 5248 | int received = 0; |
52b061a4 AG |
5249 | unsigned int header_size = drbd_header_size(tconn); |
5250 | int expect = header_size; | |
44ed167d PR |
5251 | bool ping_timeout_active = false; |
5252 | struct net_conf *nc; | |
bb77d34e | 5253 | int ping_timeo, tcp_cork, ping_int; |
b411b363 | 5254 | |
b411b363 PR |
5255 | current->policy = SCHED_RR; /* Make this a realtime task! */ |
5256 | current->rt_priority = 2; /* more important than all other tasks */ | |
5257 | ||
e77a0a5c | 5258 | while (get_t_state(thi) == RUNNING) { |
80822284 | 5259 | drbd_thread_current_set_cpu(thi); |
44ed167d PR |
5260 | |
5261 | rcu_read_lock(); | |
5262 | nc = rcu_dereference(tconn->net_conf); | |
5263 | ping_timeo = nc->ping_timeo; | |
bb77d34e | 5264 | tcp_cork = nc->tcp_cork; |
44ed167d PR |
5265 | ping_int = nc->ping_int; |
5266 | rcu_read_unlock(); | |
5267 | ||
32862ec7 | 5268 | if (test_and_clear_bit(SEND_PING, &tconn->flags)) { |
a17647aa | 5269 | if (drbd_send_ping(tconn)) { |
32862ec7 | 5270 | conn_err(tconn, "drbd_send_ping has failed\n"); |
841ce241 AG |
5271 | goto reconnect; |
5272 | } | |
44ed167d PR |
5273 | tconn->meta.socket->sk->sk_rcvtimeo = ping_timeo * HZ / 10; |
5274 | ping_timeout_active = true; | |
b411b363 PR |
5275 | } |
5276 | ||
32862ec7 PR |
5277 | /* TODO: conditionally cork; it may hurt latency if we cork without |
5278 | much to send */ | |
bb77d34e | 5279 | if (tcp_cork) |
32862ec7 | 5280 | drbd_tcp_cork(tconn->meta.socket); |
a990be46 AG |
5281 | if (tconn_finish_peer_reqs(tconn)) { |
5282 | conn_err(tconn, "tconn_finish_peer_reqs() failed\n"); | |
32862ec7 | 5283 | goto reconnect; |
082a3439 | 5284 | } |
b411b363 | 5285 | /* but unconditionally uncork unless disabled */ |
bb77d34e | 5286 | if (tcp_cork) |
32862ec7 | 5287 | drbd_tcp_uncork(tconn->meta.socket); |
b411b363 PR |
5288 | |
5289 | /* short circuit, recv_msg would return EINTR anyways. */ | |
5290 | if (signal_pending(current)) | |
5291 | continue; | |
5292 | ||
32862ec7 PR |
5293 | rv = drbd_recv_short(tconn->meta.socket, buf, expect-received, 0); |
5294 | clear_bit(SIGNAL_ASENDER, &tconn->flags); | |
b411b363 PR |
5295 | |
5296 | flush_signals(current); | |
5297 | ||
5298 | /* Note: | |
5299 | * -EINTR (on meta) we got a signal | |
5300 | * -EAGAIN (on meta) rcvtimeo expired | |
5301 | * -ECONNRESET other side closed the connection | |
5302 | * -ERESTARTSYS (on data) we got a signal | |
5303 | * rv < 0 other than above: unexpected error! | |
5304 | * rv == expected: full header or command | |
5305 | * rv < expected: "woken" by signal during receive | |
5306 | * rv == 0 : "connection shut down by peer" | |
5307 | */ | |
5308 | if (likely(rv > 0)) { | |
5309 | received += rv; | |
5310 | buf += rv; | |
5311 | } else if (rv == 0) { | |
32862ec7 | 5312 | conn_err(tconn, "meta connection shut down by peer.\n"); |
b411b363 PR |
5313 | goto reconnect; |
5314 | } else if (rv == -EAGAIN) { | |
cb6518cb LE |
5315 | /* If the data socket received something meanwhile, |
5316 | * that is good enough: peer is still alive. */ | |
32862ec7 PR |
5317 | if (time_after(tconn->last_received, |
5318 | jiffies - tconn->meta.socket->sk->sk_rcvtimeo)) | |
cb6518cb | 5319 | continue; |
f36af18c | 5320 | if (ping_timeout_active) { |
32862ec7 | 5321 | conn_err(tconn, "PingAck did not arrive in time.\n"); |
b411b363 PR |
5322 | goto reconnect; |
5323 | } | |
32862ec7 | 5324 | set_bit(SEND_PING, &tconn->flags); |
b411b363 PR |
5325 | continue; |
5326 | } else if (rv == -EINTR) { | |
5327 | continue; | |
5328 | } else { | |
32862ec7 | 5329 | conn_err(tconn, "sock_recvmsg returned %d\n", rv); |
b411b363 PR |
5330 | goto reconnect; |
5331 | } | |
5332 | ||
5333 | if (received == expect && cmd == NULL) { | |
e658983a | 5334 | if (decode_header(tconn, tconn->meta.rbuf, &pi)) |
b411b363 | 5335 | goto reconnect; |
7201b972 | 5336 | cmd = &asender_tbl[pi.cmd]; |
1952e916 | 5337 | if (pi.cmd >= ARRAY_SIZE(asender_tbl) || !cmd->fn) { |
2fcb8f30 AG |
5338 | conn_err(tconn, "Unexpected meta packet %s (0x%04x)\n", |
5339 | cmdname(pi.cmd), pi.cmd); | |
b411b363 PR |
5340 | goto disconnect; |
5341 | } | |
e658983a | 5342 | expect = header_size + cmd->pkt_size; |
52b061a4 | 5343 | if (pi.size != expect - header_size) { |
32862ec7 | 5344 | conn_err(tconn, "Wrong packet size on meta (c: %d, l: %d)\n", |
77351055 | 5345 | pi.cmd, pi.size); |
b411b363 | 5346 | goto reconnect; |
257d0af6 | 5347 | } |
b411b363 PR |
5348 | } |
5349 | if (received == expect) { | |
2735a594 | 5350 | bool err; |
a4fbda8e | 5351 | |
2735a594 AG |
5352 | err = cmd->fn(tconn, &pi); |
5353 | if (err) { | |
1952e916 | 5354 | conn_err(tconn, "%pf failed\n", cmd->fn); |
b411b363 | 5355 | goto reconnect; |
1952e916 | 5356 | } |
b411b363 | 5357 | |
a4fbda8e PR |
5358 | tconn->last_received = jiffies; |
5359 | ||
44ed167d PR |
5360 | if (cmd == &asender_tbl[P_PING_ACK]) { |
5361 | /* restore idle timeout */ | |
5362 | tconn->meta.socket->sk->sk_rcvtimeo = ping_int * HZ; | |
5363 | ping_timeout_active = false; | |
5364 | } | |
f36af18c | 5365 | |
e658983a | 5366 | buf = tconn->meta.rbuf; |
b411b363 | 5367 | received = 0; |
52b061a4 | 5368 | expect = header_size; |
b411b363 PR |
5369 | cmd = NULL; |
5370 | } | |
5371 | } | |
5372 | ||
5373 | if (0) { | |
5374 | reconnect: | |
bbeb641c | 5375 | conn_request_state(tconn, NS(conn, C_NETWORK_FAILURE), CS_HARD); |
b411b363 PR |
5376 | } |
5377 | if (0) { | |
5378 | disconnect: | |
bbeb641c | 5379 | conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 | 5380 | } |
32862ec7 | 5381 | clear_bit(SIGNAL_ASENDER, &tconn->flags); |
b411b363 | 5382 | |
32862ec7 | 5383 | conn_info(tconn, "asender terminated\n"); |
b411b363 PR |
5384 | |
5385 | return 0; | |
5386 | } |