Commit | Line | Data |
---|---|---|
b411b363 PR |
1 | /* |
2 | drbd_receiver.c | |
3 | ||
4 | This file is part of DRBD by Philipp Reisner and Lars Ellenberg. | |
5 | ||
6 | Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. | |
7 | Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>. | |
8 | Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. | |
9 | ||
10 | drbd is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 2, or (at your option) | |
13 | any later version. | |
14 | ||
15 | drbd is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
21 | along with drbd; see the file COPYING. If not, write to | |
22 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
23 | */ | |
24 | ||
25 | ||
b411b363 PR |
26 | #include <linux/module.h> |
27 | ||
28 | #include <asm/uaccess.h> | |
29 | #include <net/sock.h> | |
30 | ||
b411b363 PR |
31 | #include <linux/drbd.h> |
32 | #include <linux/fs.h> | |
33 | #include <linux/file.h> | |
34 | #include <linux/in.h> | |
35 | #include <linux/mm.h> | |
36 | #include <linux/memcontrol.h> | |
37 | #include <linux/mm_inline.h> | |
38 | #include <linux/slab.h> | |
b411b363 PR |
39 | #include <linux/pkt_sched.h> |
40 | #define __KERNEL_SYSCALLS__ | |
41 | #include <linux/unistd.h> | |
42 | #include <linux/vmalloc.h> | |
43 | #include <linux/random.h> | |
b411b363 PR |
44 | #include <linux/string.h> |
45 | #include <linux/scatterlist.h> | |
46 | #include "drbd_int.h" | |
a3603a6e | 47 | #include "drbd_protocol.h" |
b411b363 PR |
48 | #include "drbd_req.h" |
49 | ||
50 | #include "drbd_vli.h" | |
51 | ||
77351055 PR |
52 | struct packet_info { |
53 | enum drbd_packet cmd; | |
e2857216 AG |
54 | unsigned int size; |
55 | unsigned int vnr; | |
e658983a | 56 | void *data; |
77351055 PR |
57 | }; |
58 | ||
b411b363 PR |
59 | enum finish_epoch { |
60 | FE_STILL_LIVE, | |
61 | FE_DESTROYED, | |
62 | FE_RECYCLED, | |
63 | }; | |
64 | ||
bde89a9e AG |
65 | static int drbd_do_features(struct drbd_connection *connection); |
66 | static int drbd_do_auth(struct drbd_connection *connection); | |
69a22773 | 67 | static int drbd_disconnected(struct drbd_peer_device *); |
b411b363 | 68 | |
bde89a9e | 69 | static enum finish_epoch drbd_may_finish_epoch(struct drbd_connection *, struct drbd_epoch *, enum epoch_event); |
99920dc5 | 70 | static int e_end_block(struct drbd_work *, int); |
b411b363 | 71 | |
b411b363 PR |
72 | |
73 | #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) | |
74 | ||
45bb912b LE |
75 | /* |
76 | * some helper functions to deal with single linked page lists, | |
77 | * page->private being our "next" pointer. | |
78 | */ | |
79 | ||
80 | /* If at least n pages are linked at head, get n pages off. | |
81 | * Otherwise, don't modify head, and return NULL. | |
82 | * Locking is the responsibility of the caller. | |
83 | */ | |
84 | static struct page *page_chain_del(struct page **head, int n) | |
85 | { | |
86 | struct page *page; | |
87 | struct page *tmp; | |
88 | ||
89 | BUG_ON(!n); | |
90 | BUG_ON(!head); | |
91 | ||
92 | page = *head; | |
23ce4227 PR |
93 | |
94 | if (!page) | |
95 | return NULL; | |
96 | ||
45bb912b LE |
97 | while (page) { |
98 | tmp = page_chain_next(page); | |
99 | if (--n == 0) | |
100 | break; /* found sufficient pages */ | |
101 | if (tmp == NULL) | |
102 | /* insufficient pages, don't use any of them. */ | |
103 | return NULL; | |
104 | page = tmp; | |
105 | } | |
106 | ||
107 | /* add end of list marker for the returned list */ | |
108 | set_page_private(page, 0); | |
109 | /* actual return value, and adjustment of head */ | |
110 | page = *head; | |
111 | *head = tmp; | |
112 | return page; | |
113 | } | |
114 | ||
115 | /* may be used outside of locks to find the tail of a (usually short) | |
116 | * "private" page chain, before adding it back to a global chain head | |
117 | * with page_chain_add() under a spinlock. */ | |
118 | static struct page *page_chain_tail(struct page *page, int *len) | |
119 | { | |
120 | struct page *tmp; | |
121 | int i = 1; | |
122 | while ((tmp = page_chain_next(page))) | |
123 | ++i, page = tmp; | |
124 | if (len) | |
125 | *len = i; | |
126 | return page; | |
127 | } | |
128 | ||
129 | static int page_chain_free(struct page *page) | |
130 | { | |
131 | struct page *tmp; | |
132 | int i = 0; | |
133 | page_chain_for_each_safe(page, tmp) { | |
134 | put_page(page); | |
135 | ++i; | |
136 | } | |
137 | return i; | |
138 | } | |
139 | ||
140 | static void page_chain_add(struct page **head, | |
141 | struct page *chain_first, struct page *chain_last) | |
142 | { | |
143 | #if 1 | |
144 | struct page *tmp; | |
145 | tmp = page_chain_tail(chain_first, NULL); | |
146 | BUG_ON(tmp != chain_last); | |
147 | #endif | |
148 | ||
149 | /* add chain to head */ | |
150 | set_page_private(chain_last, (unsigned long)*head); | |
151 | *head = chain_first; | |
152 | } | |
153 | ||
b30ab791 | 154 | static struct page *__drbd_alloc_pages(struct drbd_device *device, |
18c2d522 | 155 | unsigned int number) |
b411b363 PR |
156 | { |
157 | struct page *page = NULL; | |
45bb912b | 158 | struct page *tmp = NULL; |
18c2d522 | 159 | unsigned int i = 0; |
b411b363 PR |
160 | |
161 | /* Yes, testing drbd_pp_vacant outside the lock is racy. | |
162 | * So what. It saves a spin_lock. */ | |
45bb912b | 163 | if (drbd_pp_vacant >= number) { |
b411b363 | 164 | spin_lock(&drbd_pp_lock); |
45bb912b LE |
165 | page = page_chain_del(&drbd_pp_pool, number); |
166 | if (page) | |
167 | drbd_pp_vacant -= number; | |
b411b363 | 168 | spin_unlock(&drbd_pp_lock); |
45bb912b LE |
169 | if (page) |
170 | return page; | |
b411b363 | 171 | } |
45bb912b | 172 | |
b411b363 PR |
173 | /* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD |
174 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
175 | * which in turn might block on the other node at this very place. */ | |
45bb912b LE |
176 | for (i = 0; i < number; i++) { |
177 | tmp = alloc_page(GFP_TRY); | |
178 | if (!tmp) | |
179 | break; | |
180 | set_page_private(tmp, (unsigned long)page); | |
181 | page = tmp; | |
182 | } | |
183 | ||
184 | if (i == number) | |
185 | return page; | |
186 | ||
187 | /* Not enough pages immediately available this time. | |
c37c8ecf | 188 | * No need to jump around here, drbd_alloc_pages will retry this |
45bb912b LE |
189 | * function "soon". */ |
190 | if (page) { | |
191 | tmp = page_chain_tail(page, NULL); | |
192 | spin_lock(&drbd_pp_lock); | |
193 | page_chain_add(&drbd_pp_pool, page, tmp); | |
194 | drbd_pp_vacant += i; | |
195 | spin_unlock(&drbd_pp_lock); | |
196 | } | |
197 | return NULL; | |
b411b363 PR |
198 | } |
199 | ||
b30ab791 | 200 | static void reclaim_finished_net_peer_reqs(struct drbd_device *device, |
a990be46 | 201 | struct list_head *to_be_freed) |
b411b363 | 202 | { |
db830c46 | 203 | struct drbd_peer_request *peer_req; |
b411b363 PR |
204 | struct list_head *le, *tle; |
205 | ||
206 | /* The EEs are always appended to the end of the list. Since | |
207 | they are sent in order over the wire, they have to finish | |
208 | in order. As soon as we see the first not finished we can | |
209 | stop to examine the list... */ | |
210 | ||
b30ab791 | 211 | list_for_each_safe(le, tle, &device->net_ee) { |
db830c46 | 212 | peer_req = list_entry(le, struct drbd_peer_request, w.list); |
045417f7 | 213 | if (drbd_peer_req_has_active_page(peer_req)) |
b411b363 PR |
214 | break; |
215 | list_move(le, to_be_freed); | |
216 | } | |
217 | } | |
218 | ||
b30ab791 | 219 | static void drbd_kick_lo_and_reclaim_net(struct drbd_device *device) |
b411b363 PR |
220 | { |
221 | LIST_HEAD(reclaimed); | |
db830c46 | 222 | struct drbd_peer_request *peer_req, *t; |
b411b363 | 223 | |
0500813f | 224 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 | 225 | reclaim_finished_net_peer_reqs(device, &reclaimed); |
0500813f | 226 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 | 227 | |
db830c46 | 228 | list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) |
b30ab791 | 229 | drbd_free_net_peer_req(device, peer_req); |
b411b363 PR |
230 | } |
231 | ||
232 | /** | |
c37c8ecf | 233 | * drbd_alloc_pages() - Returns @number pages, retries forever (or until signalled) |
b30ab791 | 234 | * @device: DRBD device. |
45bb912b LE |
235 | * @number: number of pages requested |
236 | * @retry: whether to retry, if not enough pages are available right now | |
237 | * | |
238 | * Tries to allocate number pages, first from our own page pool, then from | |
239 | * the kernel, unless this allocation would exceed the max_buffers setting. | |
240 | * Possibly retry until DRBD frees sufficient pages somewhere else. | |
b411b363 | 241 | * |
45bb912b | 242 | * Returns a page chain linked via page->private. |
b411b363 | 243 | */ |
69a22773 | 244 | struct page *drbd_alloc_pages(struct drbd_peer_device *peer_device, unsigned int number, |
c37c8ecf | 245 | bool retry) |
b411b363 | 246 | { |
69a22773 | 247 | struct drbd_device *device = peer_device->device; |
b411b363 | 248 | struct page *page = NULL; |
44ed167d | 249 | struct net_conf *nc; |
b411b363 | 250 | DEFINE_WAIT(wait); |
44ed167d | 251 | int mxb; |
b411b363 | 252 | |
45bb912b LE |
253 | /* Yes, we may run up to @number over max_buffers. If we |
254 | * follow it strictly, the admin will get it wrong anyways. */ | |
44ed167d | 255 | rcu_read_lock(); |
69a22773 | 256 | nc = rcu_dereference(peer_device->connection->net_conf); |
44ed167d PR |
257 | mxb = nc ? nc->max_buffers : 1000000; |
258 | rcu_read_unlock(); | |
259 | ||
b30ab791 AG |
260 | if (atomic_read(&device->pp_in_use) < mxb) |
261 | page = __drbd_alloc_pages(device, number); | |
b411b363 | 262 | |
45bb912b | 263 | while (page == NULL) { |
b411b363 PR |
264 | prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE); |
265 | ||
b30ab791 | 266 | drbd_kick_lo_and_reclaim_net(device); |
b411b363 | 267 | |
b30ab791 AG |
268 | if (atomic_read(&device->pp_in_use) < mxb) { |
269 | page = __drbd_alloc_pages(device, number); | |
b411b363 PR |
270 | if (page) |
271 | break; | |
272 | } | |
273 | ||
274 | if (!retry) | |
275 | break; | |
276 | ||
277 | if (signal_pending(current)) { | |
d0180171 | 278 | drbd_warn(device, "drbd_alloc_pages interrupted!\n"); |
b411b363 PR |
279 | break; |
280 | } | |
281 | ||
282 | schedule(); | |
283 | } | |
284 | finish_wait(&drbd_pp_wait, &wait); | |
285 | ||
45bb912b | 286 | if (page) |
b30ab791 | 287 | atomic_add(number, &device->pp_in_use); |
b411b363 PR |
288 | return page; |
289 | } | |
290 | ||
c37c8ecf | 291 | /* Must not be used from irq, as that may deadlock: see drbd_alloc_pages. |
0500813f | 292 | * Is also used from inside an other spin_lock_irq(&resource->req_lock); |
45bb912b LE |
293 | * Either links the page chain back to the global pool, |
294 | * or returns all pages to the system. */ | |
b30ab791 | 295 | static void drbd_free_pages(struct drbd_device *device, struct page *page, int is_net) |
b411b363 | 296 | { |
b30ab791 | 297 | atomic_t *a = is_net ? &device->pp_in_use_by_net : &device->pp_in_use; |
b411b363 | 298 | int i; |
435f0740 | 299 | |
a73ff323 LE |
300 | if (page == NULL) |
301 | return; | |
302 | ||
81a5d60e | 303 | if (drbd_pp_vacant > (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * minor_count) |
45bb912b LE |
304 | i = page_chain_free(page); |
305 | else { | |
306 | struct page *tmp; | |
307 | tmp = page_chain_tail(page, &i); | |
308 | spin_lock(&drbd_pp_lock); | |
309 | page_chain_add(&drbd_pp_pool, page, tmp); | |
310 | drbd_pp_vacant += i; | |
311 | spin_unlock(&drbd_pp_lock); | |
b411b363 | 312 | } |
435f0740 | 313 | i = atomic_sub_return(i, a); |
45bb912b | 314 | if (i < 0) |
d0180171 | 315 | drbd_warn(device, "ASSERTION FAILED: %s: %d < 0\n", |
435f0740 | 316 | is_net ? "pp_in_use_by_net" : "pp_in_use", i); |
b411b363 PR |
317 | wake_up(&drbd_pp_wait); |
318 | } | |
319 | ||
320 | /* | |
321 | You need to hold the req_lock: | |
322 | _drbd_wait_ee_list_empty() | |
323 | ||
324 | You must not have the req_lock: | |
3967deb1 | 325 | drbd_free_peer_req() |
0db55363 | 326 | drbd_alloc_peer_req() |
7721f567 | 327 | drbd_free_peer_reqs() |
b411b363 | 328 | drbd_ee_fix_bhs() |
a990be46 | 329 | drbd_finish_peer_reqs() |
b411b363 PR |
330 | drbd_clear_done_ee() |
331 | drbd_wait_ee_list_empty() | |
332 | */ | |
333 | ||
f6ffca9f | 334 | struct drbd_peer_request * |
69a22773 | 335 | drbd_alloc_peer_req(struct drbd_peer_device *peer_device, u64 id, sector_t sector, |
0db55363 | 336 | unsigned int data_size, gfp_t gfp_mask) __must_hold(local) |
b411b363 | 337 | { |
69a22773 | 338 | struct drbd_device *device = peer_device->device; |
db830c46 | 339 | struct drbd_peer_request *peer_req; |
a73ff323 | 340 | struct page *page = NULL; |
45bb912b | 341 | unsigned nr_pages = (data_size + PAGE_SIZE -1) >> PAGE_SHIFT; |
b411b363 | 342 | |
b30ab791 | 343 | if (drbd_insert_fault(device, DRBD_FAULT_AL_EE)) |
b411b363 PR |
344 | return NULL; |
345 | ||
db830c46 AG |
346 | peer_req = mempool_alloc(drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM); |
347 | if (!peer_req) { | |
b411b363 | 348 | if (!(gfp_mask & __GFP_NOWARN)) |
d0180171 | 349 | drbd_err(device, "%s: allocation failed\n", __func__); |
b411b363 PR |
350 | return NULL; |
351 | } | |
352 | ||
a73ff323 | 353 | if (data_size) { |
69a22773 | 354 | page = drbd_alloc_pages(peer_device, nr_pages, (gfp_mask & __GFP_WAIT)); |
a73ff323 LE |
355 | if (!page) |
356 | goto fail; | |
357 | } | |
b411b363 | 358 | |
db830c46 AG |
359 | drbd_clear_interval(&peer_req->i); |
360 | peer_req->i.size = data_size; | |
361 | peer_req->i.sector = sector; | |
362 | peer_req->i.local = false; | |
363 | peer_req->i.waiting = false; | |
364 | ||
365 | peer_req->epoch = NULL; | |
b30ab791 | 366 | peer_req->w.device = device; |
db830c46 AG |
367 | peer_req->pages = page; |
368 | atomic_set(&peer_req->pending_bios, 0); | |
369 | peer_req->flags = 0; | |
9a8e7753 AG |
370 | /* |
371 | * The block_id is opaque to the receiver. It is not endianness | |
372 | * converted, and sent back to the sender unchanged. | |
373 | */ | |
db830c46 | 374 | peer_req->block_id = id; |
b411b363 | 375 | |
db830c46 | 376 | return peer_req; |
b411b363 | 377 | |
45bb912b | 378 | fail: |
db830c46 | 379 | mempool_free(peer_req, drbd_ee_mempool); |
b411b363 PR |
380 | return NULL; |
381 | } | |
382 | ||
b30ab791 | 383 | void __drbd_free_peer_req(struct drbd_device *device, struct drbd_peer_request *peer_req, |
f6ffca9f | 384 | int is_net) |
b411b363 | 385 | { |
db830c46 AG |
386 | if (peer_req->flags & EE_HAS_DIGEST) |
387 | kfree(peer_req->digest); | |
b30ab791 | 388 | drbd_free_pages(device, peer_req->pages, is_net); |
0b0ba1ef AG |
389 | D_ASSERT(device, atomic_read(&peer_req->pending_bios) == 0); |
390 | D_ASSERT(device, drbd_interval_empty(&peer_req->i)); | |
db830c46 | 391 | mempool_free(peer_req, drbd_ee_mempool); |
b411b363 PR |
392 | } |
393 | ||
b30ab791 | 394 | int drbd_free_peer_reqs(struct drbd_device *device, struct list_head *list) |
b411b363 PR |
395 | { |
396 | LIST_HEAD(work_list); | |
db830c46 | 397 | struct drbd_peer_request *peer_req, *t; |
b411b363 | 398 | int count = 0; |
b30ab791 | 399 | int is_net = list == &device->net_ee; |
b411b363 | 400 | |
0500813f | 401 | spin_lock_irq(&device->resource->req_lock); |
b411b363 | 402 | list_splice_init(list, &work_list); |
0500813f | 403 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 | 404 | |
db830c46 | 405 | list_for_each_entry_safe(peer_req, t, &work_list, w.list) { |
b30ab791 | 406 | __drbd_free_peer_req(device, peer_req, is_net); |
b411b363 PR |
407 | count++; |
408 | } | |
409 | return count; | |
410 | } | |
411 | ||
b411b363 | 412 | /* |
a990be46 | 413 | * See also comments in _req_mod(,BARRIER_ACKED) and receive_Barrier. |
b411b363 | 414 | */ |
b30ab791 | 415 | static int drbd_finish_peer_reqs(struct drbd_device *device) |
b411b363 PR |
416 | { |
417 | LIST_HEAD(work_list); | |
418 | LIST_HEAD(reclaimed); | |
db830c46 | 419 | struct drbd_peer_request *peer_req, *t; |
e2b3032b | 420 | int err = 0; |
b411b363 | 421 | |
0500813f | 422 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 AG |
423 | reclaim_finished_net_peer_reqs(device, &reclaimed); |
424 | list_splice_init(&device->done_ee, &work_list); | |
0500813f | 425 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 | 426 | |
db830c46 | 427 | list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) |
b30ab791 | 428 | drbd_free_net_peer_req(device, peer_req); |
b411b363 PR |
429 | |
430 | /* possible callbacks here: | |
d4dabbe2 | 431 | * e_end_block, and e_end_resync_block, e_send_superseded. |
b411b363 PR |
432 | * all ignore the last argument. |
433 | */ | |
db830c46 | 434 | list_for_each_entry_safe(peer_req, t, &work_list, w.list) { |
e2b3032b AG |
435 | int err2; |
436 | ||
b411b363 | 437 | /* list_del not necessary, next/prev members not touched */ |
e2b3032b AG |
438 | err2 = peer_req->w.cb(&peer_req->w, !!err); |
439 | if (!err) | |
440 | err = err2; | |
b30ab791 | 441 | drbd_free_peer_req(device, peer_req); |
b411b363 | 442 | } |
b30ab791 | 443 | wake_up(&device->ee_wait); |
b411b363 | 444 | |
e2b3032b | 445 | return err; |
b411b363 PR |
446 | } |
447 | ||
b30ab791 | 448 | static void _drbd_wait_ee_list_empty(struct drbd_device *device, |
d4da1537 | 449 | struct list_head *head) |
b411b363 PR |
450 | { |
451 | DEFINE_WAIT(wait); | |
452 | ||
453 | /* avoids spin_lock/unlock | |
454 | * and calling prepare_to_wait in the fast path */ | |
455 | while (!list_empty(head)) { | |
b30ab791 | 456 | prepare_to_wait(&device->ee_wait, &wait, TASK_UNINTERRUPTIBLE); |
0500813f | 457 | spin_unlock_irq(&device->resource->req_lock); |
7eaceacc | 458 | io_schedule(); |
b30ab791 | 459 | finish_wait(&device->ee_wait, &wait); |
0500813f | 460 | spin_lock_irq(&device->resource->req_lock); |
b411b363 PR |
461 | } |
462 | } | |
463 | ||
b30ab791 | 464 | static void drbd_wait_ee_list_empty(struct drbd_device *device, |
d4da1537 | 465 | struct list_head *head) |
b411b363 | 466 | { |
0500813f | 467 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 | 468 | _drbd_wait_ee_list_empty(device, head); |
0500813f | 469 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 PR |
470 | } |
471 | ||
dbd9eea0 | 472 | static int drbd_recv_short(struct socket *sock, void *buf, size_t size, int flags) |
b411b363 PR |
473 | { |
474 | mm_segment_t oldfs; | |
475 | struct kvec iov = { | |
476 | .iov_base = buf, | |
477 | .iov_len = size, | |
478 | }; | |
479 | struct msghdr msg = { | |
480 | .msg_iovlen = 1, | |
481 | .msg_iov = (struct iovec *)&iov, | |
482 | .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) | |
483 | }; | |
484 | int rv; | |
485 | ||
486 | oldfs = get_fs(); | |
487 | set_fs(KERNEL_DS); | |
488 | rv = sock_recvmsg(sock, &msg, size, msg.msg_flags); | |
489 | set_fs(oldfs); | |
490 | ||
491 | return rv; | |
492 | } | |
493 | ||
bde89a9e | 494 | static int drbd_recv(struct drbd_connection *connection, void *buf, size_t size) |
b411b363 | 495 | { |
b411b363 PR |
496 | int rv; |
497 | ||
bde89a9e | 498 | rv = drbd_recv_short(connection->data.socket, buf, size, 0); |
b411b363 | 499 | |
dbd0820c PR |
500 | if (rv < 0) { |
501 | if (rv == -ECONNRESET) | |
1ec861eb | 502 | drbd_info(connection, "sock was reset by peer\n"); |
dbd0820c | 503 | else if (rv != -ERESTARTSYS) |
1ec861eb | 504 | drbd_err(connection, "sock_recvmsg returned %d\n", rv); |
dbd0820c | 505 | } else if (rv == 0) { |
bde89a9e | 506 | if (test_bit(DISCONNECT_SENT, &connection->flags)) { |
b66623e3 PR |
507 | long t; |
508 | rcu_read_lock(); | |
bde89a9e | 509 | t = rcu_dereference(connection->net_conf)->ping_timeo * HZ/10; |
b66623e3 PR |
510 | rcu_read_unlock(); |
511 | ||
bde89a9e | 512 | t = wait_event_timeout(connection->ping_wait, connection->cstate < C_WF_REPORT_PARAMS, t); |
b66623e3 | 513 | |
599377ac PR |
514 | if (t) |
515 | goto out; | |
516 | } | |
1ec861eb | 517 | drbd_info(connection, "sock was shut down by peer\n"); |
599377ac PR |
518 | } |
519 | ||
b411b363 | 520 | if (rv != size) |
bde89a9e | 521 | conn_request_state(connection, NS(conn, C_BROKEN_PIPE), CS_HARD); |
b411b363 | 522 | |
599377ac | 523 | out: |
b411b363 PR |
524 | return rv; |
525 | } | |
526 | ||
bde89a9e | 527 | static int drbd_recv_all(struct drbd_connection *connection, void *buf, size_t size) |
c6967746 AG |
528 | { |
529 | int err; | |
530 | ||
bde89a9e | 531 | err = drbd_recv(connection, buf, size); |
c6967746 AG |
532 | if (err != size) { |
533 | if (err >= 0) | |
534 | err = -EIO; | |
535 | } else | |
536 | err = 0; | |
537 | return err; | |
538 | } | |
539 | ||
bde89a9e | 540 | static int drbd_recv_all_warn(struct drbd_connection *connection, void *buf, size_t size) |
a5c31904 AG |
541 | { |
542 | int err; | |
543 | ||
bde89a9e | 544 | err = drbd_recv_all(connection, buf, size); |
a5c31904 | 545 | if (err && !signal_pending(current)) |
1ec861eb | 546 | drbd_warn(connection, "short read (expected size %d)\n", (int)size); |
a5c31904 AG |
547 | return err; |
548 | } | |
549 | ||
5dbf1673 LE |
550 | /* quoting tcp(7): |
551 | * On individual connections, the socket buffer size must be set prior to the | |
552 | * listen(2) or connect(2) calls in order to have it take effect. | |
553 | * This is our wrapper to do so. | |
554 | */ | |
555 | static void drbd_setbufsize(struct socket *sock, unsigned int snd, | |
556 | unsigned int rcv) | |
557 | { | |
558 | /* open coded SO_SNDBUF, SO_RCVBUF */ | |
559 | if (snd) { | |
560 | sock->sk->sk_sndbuf = snd; | |
561 | sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; | |
562 | } | |
563 | if (rcv) { | |
564 | sock->sk->sk_rcvbuf = rcv; | |
565 | sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; | |
566 | } | |
567 | } | |
568 | ||
bde89a9e | 569 | static struct socket *drbd_try_connect(struct drbd_connection *connection) |
b411b363 PR |
570 | { |
571 | const char *what; | |
572 | struct socket *sock; | |
573 | struct sockaddr_in6 src_in6; | |
44ed167d PR |
574 | struct sockaddr_in6 peer_in6; |
575 | struct net_conf *nc; | |
576 | int err, peer_addr_len, my_addr_len; | |
69ef82de | 577 | int sndbuf_size, rcvbuf_size, connect_int; |
b411b363 PR |
578 | int disconnect_on_error = 1; |
579 | ||
44ed167d | 580 | rcu_read_lock(); |
bde89a9e | 581 | nc = rcu_dereference(connection->net_conf); |
44ed167d PR |
582 | if (!nc) { |
583 | rcu_read_unlock(); | |
b411b363 | 584 | return NULL; |
44ed167d | 585 | } |
44ed167d PR |
586 | sndbuf_size = nc->sndbuf_size; |
587 | rcvbuf_size = nc->rcvbuf_size; | |
69ef82de | 588 | connect_int = nc->connect_int; |
089c075d | 589 | rcu_read_unlock(); |
44ed167d | 590 | |
bde89a9e AG |
591 | my_addr_len = min_t(int, connection->my_addr_len, sizeof(src_in6)); |
592 | memcpy(&src_in6, &connection->my_addr, my_addr_len); | |
44ed167d | 593 | |
bde89a9e | 594 | if (((struct sockaddr *)&connection->my_addr)->sa_family == AF_INET6) |
44ed167d PR |
595 | src_in6.sin6_port = 0; |
596 | else | |
597 | ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ | |
598 | ||
bde89a9e AG |
599 | peer_addr_len = min_t(int, connection->peer_addr_len, sizeof(src_in6)); |
600 | memcpy(&peer_in6, &connection->peer_addr, peer_addr_len); | |
b411b363 PR |
601 | |
602 | what = "sock_create_kern"; | |
44ed167d PR |
603 | err = sock_create_kern(((struct sockaddr *)&src_in6)->sa_family, |
604 | SOCK_STREAM, IPPROTO_TCP, &sock); | |
b411b363 PR |
605 | if (err < 0) { |
606 | sock = NULL; | |
607 | goto out; | |
608 | } | |
609 | ||
610 | sock->sk->sk_rcvtimeo = | |
69ef82de | 611 | sock->sk->sk_sndtimeo = connect_int * HZ; |
44ed167d | 612 | drbd_setbufsize(sock, sndbuf_size, rcvbuf_size); |
b411b363 PR |
613 | |
614 | /* explicitly bind to the configured IP as source IP | |
615 | * for the outgoing connections. | |
616 | * This is needed for multihomed hosts and to be | |
617 | * able to use lo: interfaces for drbd. | |
618 | * Make sure to use 0 as port number, so linux selects | |
619 | * a free one dynamically. | |
620 | */ | |
b411b363 | 621 | what = "bind before connect"; |
44ed167d | 622 | err = sock->ops->bind(sock, (struct sockaddr *) &src_in6, my_addr_len); |
b411b363 PR |
623 | if (err < 0) |
624 | goto out; | |
625 | ||
626 | /* connect may fail, peer not yet available. | |
627 | * stay C_WF_CONNECTION, don't go Disconnecting! */ | |
628 | disconnect_on_error = 0; | |
629 | what = "connect"; | |
44ed167d | 630 | err = sock->ops->connect(sock, (struct sockaddr *) &peer_in6, peer_addr_len, 0); |
b411b363 PR |
631 | |
632 | out: | |
633 | if (err < 0) { | |
634 | if (sock) { | |
635 | sock_release(sock); | |
636 | sock = NULL; | |
637 | } | |
638 | switch (-err) { | |
639 | /* timeout, busy, signal pending */ | |
640 | case ETIMEDOUT: case EAGAIN: case EINPROGRESS: | |
641 | case EINTR: case ERESTARTSYS: | |
642 | /* peer not (yet) available, network problem */ | |
643 | case ECONNREFUSED: case ENETUNREACH: | |
644 | case EHOSTDOWN: case EHOSTUNREACH: | |
645 | disconnect_on_error = 0; | |
646 | break; | |
647 | default: | |
1ec861eb | 648 | drbd_err(connection, "%s failed, err = %d\n", what, err); |
b411b363 PR |
649 | } |
650 | if (disconnect_on_error) | |
bde89a9e | 651 | conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 | 652 | } |
44ed167d | 653 | |
b411b363 PR |
654 | return sock; |
655 | } | |
656 | ||
7a426fd8 | 657 | struct accept_wait_data { |
bde89a9e | 658 | struct drbd_connection *connection; |
7a426fd8 PR |
659 | struct socket *s_listen; |
660 | struct completion door_bell; | |
661 | void (*original_sk_state_change)(struct sock *sk); | |
662 | ||
663 | }; | |
664 | ||
715306f6 | 665 | static void drbd_incoming_connection(struct sock *sk) |
7a426fd8 PR |
666 | { |
667 | struct accept_wait_data *ad = sk->sk_user_data; | |
715306f6 | 668 | void (*state_change)(struct sock *sk); |
7a426fd8 | 669 | |
715306f6 AG |
670 | state_change = ad->original_sk_state_change; |
671 | if (sk->sk_state == TCP_ESTABLISHED) | |
672 | complete(&ad->door_bell); | |
673 | state_change(sk); | |
7a426fd8 PR |
674 | } |
675 | ||
bde89a9e | 676 | static int prepare_listen_socket(struct drbd_connection *connection, struct accept_wait_data *ad) |
b411b363 | 677 | { |
1f3e509b | 678 | int err, sndbuf_size, rcvbuf_size, my_addr_len; |
44ed167d | 679 | struct sockaddr_in6 my_addr; |
1f3e509b | 680 | struct socket *s_listen; |
44ed167d | 681 | struct net_conf *nc; |
b411b363 PR |
682 | const char *what; |
683 | ||
44ed167d | 684 | rcu_read_lock(); |
bde89a9e | 685 | nc = rcu_dereference(connection->net_conf); |
44ed167d PR |
686 | if (!nc) { |
687 | rcu_read_unlock(); | |
7a426fd8 | 688 | return -EIO; |
44ed167d | 689 | } |
44ed167d PR |
690 | sndbuf_size = nc->sndbuf_size; |
691 | rcvbuf_size = nc->rcvbuf_size; | |
44ed167d | 692 | rcu_read_unlock(); |
b411b363 | 693 | |
bde89a9e AG |
694 | my_addr_len = min_t(int, connection->my_addr_len, sizeof(struct sockaddr_in6)); |
695 | memcpy(&my_addr, &connection->my_addr, my_addr_len); | |
b411b363 PR |
696 | |
697 | what = "sock_create_kern"; | |
44ed167d | 698 | err = sock_create_kern(((struct sockaddr *)&my_addr)->sa_family, |
1f3e509b | 699 | SOCK_STREAM, IPPROTO_TCP, &s_listen); |
b411b363 PR |
700 | if (err) { |
701 | s_listen = NULL; | |
702 | goto out; | |
703 | } | |
704 | ||
98683650 | 705 | s_listen->sk->sk_reuse = SK_CAN_REUSE; /* SO_REUSEADDR */ |
44ed167d | 706 | drbd_setbufsize(s_listen, sndbuf_size, rcvbuf_size); |
b411b363 PR |
707 | |
708 | what = "bind before listen"; | |
44ed167d | 709 | err = s_listen->ops->bind(s_listen, (struct sockaddr *)&my_addr, my_addr_len); |
b411b363 PR |
710 | if (err < 0) |
711 | goto out; | |
712 | ||
7a426fd8 PR |
713 | ad->s_listen = s_listen; |
714 | write_lock_bh(&s_listen->sk->sk_callback_lock); | |
715 | ad->original_sk_state_change = s_listen->sk->sk_state_change; | |
715306f6 | 716 | s_listen->sk->sk_state_change = drbd_incoming_connection; |
7a426fd8 PR |
717 | s_listen->sk->sk_user_data = ad; |
718 | write_unlock_bh(&s_listen->sk->sk_callback_lock); | |
b411b363 | 719 | |
2820fd39 PR |
720 | what = "listen"; |
721 | err = s_listen->ops->listen(s_listen, 5); | |
722 | if (err < 0) | |
723 | goto out; | |
724 | ||
7a426fd8 | 725 | return 0; |
b411b363 PR |
726 | out: |
727 | if (s_listen) | |
728 | sock_release(s_listen); | |
729 | if (err < 0) { | |
730 | if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { | |
1ec861eb | 731 | drbd_err(connection, "%s failed, err = %d\n", what, err); |
bde89a9e | 732 | conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 PR |
733 | } |
734 | } | |
b411b363 | 735 | |
7a426fd8 | 736 | return -EIO; |
b411b363 PR |
737 | } |
738 | ||
715306f6 | 739 | static void unregister_state_change(struct sock *sk, struct accept_wait_data *ad) |
b411b363 | 740 | { |
715306f6 AG |
741 | write_lock_bh(&sk->sk_callback_lock); |
742 | sk->sk_state_change = ad->original_sk_state_change; | |
743 | sk->sk_user_data = NULL; | |
744 | write_unlock_bh(&sk->sk_callback_lock); | |
b411b363 PR |
745 | } |
746 | ||
bde89a9e | 747 | static struct socket *drbd_wait_for_connect(struct drbd_connection *connection, struct accept_wait_data *ad) |
b411b363 | 748 | { |
1f3e509b PR |
749 | int timeo, connect_int, err = 0; |
750 | struct socket *s_estab = NULL; | |
1f3e509b PR |
751 | struct net_conf *nc; |
752 | ||
753 | rcu_read_lock(); | |
bde89a9e | 754 | nc = rcu_dereference(connection->net_conf); |
1f3e509b PR |
755 | if (!nc) { |
756 | rcu_read_unlock(); | |
757 | return NULL; | |
758 | } | |
759 | connect_int = nc->connect_int; | |
760 | rcu_read_unlock(); | |
761 | ||
762 | timeo = connect_int * HZ; | |
38b682b2 AM |
763 | /* 28.5% random jitter */ |
764 | timeo += (prandom_u32() & 1) ? timeo / 7 : -timeo / 7; | |
1f3e509b | 765 | |
7a426fd8 PR |
766 | err = wait_for_completion_interruptible_timeout(&ad->door_bell, timeo); |
767 | if (err <= 0) | |
768 | return NULL; | |
b411b363 | 769 | |
7a426fd8 | 770 | err = kernel_accept(ad->s_listen, &s_estab, 0); |
b411b363 PR |
771 | if (err < 0) { |
772 | if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { | |
1ec861eb | 773 | drbd_err(connection, "accept failed, err = %d\n", err); |
bde89a9e | 774 | conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 PR |
775 | } |
776 | } | |
b411b363 | 777 | |
715306f6 AG |
778 | if (s_estab) |
779 | unregister_state_change(s_estab->sk, ad); | |
b411b363 | 780 | |
b411b363 PR |
781 | return s_estab; |
782 | } | |
b411b363 | 783 | |
bde89a9e | 784 | static int decode_header(struct drbd_connection *, void *, struct packet_info *); |
b411b363 | 785 | |
bde89a9e | 786 | static int send_first_packet(struct drbd_connection *connection, struct drbd_socket *sock, |
9f5bdc33 AG |
787 | enum drbd_packet cmd) |
788 | { | |
bde89a9e | 789 | if (!conn_prepare_command(connection, sock)) |
9f5bdc33 | 790 | return -EIO; |
bde89a9e | 791 | return conn_send_command(connection, sock, cmd, 0, NULL, 0); |
b411b363 PR |
792 | } |
793 | ||
bde89a9e | 794 | static int receive_first_packet(struct drbd_connection *connection, struct socket *sock) |
b411b363 | 795 | { |
bde89a9e | 796 | unsigned int header_size = drbd_header_size(connection); |
9f5bdc33 AG |
797 | struct packet_info pi; |
798 | int err; | |
b411b363 | 799 | |
bde89a9e | 800 | err = drbd_recv_short(sock, connection->data.rbuf, header_size, 0); |
9f5bdc33 AG |
801 | if (err != header_size) { |
802 | if (err >= 0) | |
803 | err = -EIO; | |
804 | return err; | |
805 | } | |
bde89a9e | 806 | err = decode_header(connection, connection->data.rbuf, &pi); |
9f5bdc33 AG |
807 | if (err) |
808 | return err; | |
809 | return pi.cmd; | |
b411b363 PR |
810 | } |
811 | ||
812 | /** | |
813 | * drbd_socket_okay() - Free the socket if its connection is not okay | |
b411b363 PR |
814 | * @sock: pointer to the pointer to the socket. |
815 | */ | |
dbd9eea0 | 816 | static int drbd_socket_okay(struct socket **sock) |
b411b363 PR |
817 | { |
818 | int rr; | |
819 | char tb[4]; | |
820 | ||
821 | if (!*sock) | |
81e84650 | 822 | return false; |
b411b363 | 823 | |
dbd9eea0 | 824 | rr = drbd_recv_short(*sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); |
b411b363 PR |
825 | |
826 | if (rr > 0 || rr == -EAGAIN) { | |
81e84650 | 827 | return true; |
b411b363 PR |
828 | } else { |
829 | sock_release(*sock); | |
830 | *sock = NULL; | |
81e84650 | 831 | return false; |
b411b363 PR |
832 | } |
833 | } | |
2325eb66 PR |
834 | /* Gets called if a connection is established, or if a new minor gets created |
835 | in a connection */ | |
69a22773 | 836 | int drbd_connected(struct drbd_peer_device *peer_device) |
907599e0 | 837 | { |
69a22773 | 838 | struct drbd_device *device = peer_device->device; |
0829f5ed | 839 | int err; |
907599e0 | 840 | |
b30ab791 AG |
841 | atomic_set(&device->packet_seq, 0); |
842 | device->peer_seq = 0; | |
907599e0 | 843 | |
69a22773 AG |
844 | device->state_mutex = peer_device->connection->agreed_pro_version < 100 ? |
845 | &peer_device->connection->cstate_mutex : | |
b30ab791 | 846 | &device->own_state_mutex; |
8410da8f | 847 | |
69a22773 | 848 | err = drbd_send_sync_param(peer_device); |
0829f5ed | 849 | if (!err) |
69a22773 | 850 | err = drbd_send_sizes(peer_device, 0, 0); |
0829f5ed | 851 | if (!err) |
69a22773 | 852 | err = drbd_send_uuids(peer_device); |
0829f5ed | 853 | if (!err) |
69a22773 | 854 | err = drbd_send_current_state(peer_device); |
b30ab791 AG |
855 | clear_bit(USE_DEGR_WFC_T, &device->flags); |
856 | clear_bit(RESIZE_PENDING, &device->flags); | |
857 | atomic_set(&device->ap_in_flight, 0); | |
858 | mod_timer(&device->request_timer, jiffies + HZ); /* just start it here. */ | |
0829f5ed | 859 | return err; |
907599e0 | 860 | } |
b411b363 PR |
861 | |
862 | /* | |
863 | * return values: | |
864 | * 1 yes, we have a valid connection | |
865 | * 0 oops, did not work out, please try again | |
866 | * -1 peer talks different language, | |
867 | * no point in trying again, please go standalone. | |
868 | * -2 We do not have a network config... | |
869 | */ | |
bde89a9e | 870 | static int conn_connect(struct drbd_connection *connection) |
b411b363 | 871 | { |
7da35862 | 872 | struct drbd_socket sock, msock; |
c06ece6b | 873 | struct drbd_peer_device *peer_device; |
44ed167d | 874 | struct net_conf *nc; |
92f14951 | 875 | int vnr, timeout, h, ok; |
08b165ba | 876 | bool discard_my_data; |
197296ff | 877 | enum drbd_state_rv rv; |
7a426fd8 | 878 | struct accept_wait_data ad = { |
bde89a9e | 879 | .connection = connection, |
7a426fd8 PR |
880 | .door_bell = COMPLETION_INITIALIZER_ONSTACK(ad.door_bell), |
881 | }; | |
b411b363 | 882 | |
bde89a9e AG |
883 | clear_bit(DISCONNECT_SENT, &connection->flags); |
884 | if (conn_request_state(connection, NS(conn, C_WF_CONNECTION), CS_VERBOSE) < SS_SUCCESS) | |
b411b363 PR |
885 | return -2; |
886 | ||
7da35862 | 887 | mutex_init(&sock.mutex); |
bde89a9e AG |
888 | sock.sbuf = connection->data.sbuf; |
889 | sock.rbuf = connection->data.rbuf; | |
7da35862 PR |
890 | sock.socket = NULL; |
891 | mutex_init(&msock.mutex); | |
bde89a9e AG |
892 | msock.sbuf = connection->meta.sbuf; |
893 | msock.rbuf = connection->meta.rbuf; | |
7da35862 PR |
894 | msock.socket = NULL; |
895 | ||
0916e0e3 | 896 | /* Assume that the peer only understands protocol 80 until we know better. */ |
bde89a9e | 897 | connection->agreed_pro_version = 80; |
b411b363 | 898 | |
bde89a9e | 899 | if (prepare_listen_socket(connection, &ad)) |
7a426fd8 | 900 | return 0; |
b411b363 PR |
901 | |
902 | do { | |
2bf89621 | 903 | struct socket *s; |
b411b363 | 904 | |
bde89a9e | 905 | s = drbd_try_connect(connection); |
b411b363 | 906 | if (s) { |
7da35862 PR |
907 | if (!sock.socket) { |
908 | sock.socket = s; | |
bde89a9e | 909 | send_first_packet(connection, &sock, P_INITIAL_DATA); |
7da35862 | 910 | } else if (!msock.socket) { |
bde89a9e | 911 | clear_bit(RESOLVE_CONFLICTS, &connection->flags); |
7da35862 | 912 | msock.socket = s; |
bde89a9e | 913 | send_first_packet(connection, &msock, P_INITIAL_META); |
b411b363 | 914 | } else { |
1ec861eb | 915 | drbd_err(connection, "Logic error in conn_connect()\n"); |
b411b363 PR |
916 | goto out_release_sockets; |
917 | } | |
918 | } | |
919 | ||
7da35862 PR |
920 | if (sock.socket && msock.socket) { |
921 | rcu_read_lock(); | |
bde89a9e | 922 | nc = rcu_dereference(connection->net_conf); |
7da35862 PR |
923 | timeout = nc->ping_timeo * HZ / 10; |
924 | rcu_read_unlock(); | |
925 | schedule_timeout_interruptible(timeout); | |
926 | ok = drbd_socket_okay(&sock.socket); | |
927 | ok = drbd_socket_okay(&msock.socket) && ok; | |
b411b363 PR |
928 | if (ok) |
929 | break; | |
930 | } | |
931 | ||
932 | retry: | |
bde89a9e | 933 | s = drbd_wait_for_connect(connection, &ad); |
b411b363 | 934 | if (s) { |
bde89a9e | 935 | int fp = receive_first_packet(connection, s); |
7da35862 PR |
936 | drbd_socket_okay(&sock.socket); |
937 | drbd_socket_okay(&msock.socket); | |
92f14951 | 938 | switch (fp) { |
e5d6f33a | 939 | case P_INITIAL_DATA: |
7da35862 | 940 | if (sock.socket) { |
1ec861eb | 941 | drbd_warn(connection, "initial packet S crossed\n"); |
7da35862 | 942 | sock_release(sock.socket); |
80c6eed4 PR |
943 | sock.socket = s; |
944 | goto randomize; | |
b411b363 | 945 | } |
7da35862 | 946 | sock.socket = s; |
b411b363 | 947 | break; |
e5d6f33a | 948 | case P_INITIAL_META: |
bde89a9e | 949 | set_bit(RESOLVE_CONFLICTS, &connection->flags); |
7da35862 | 950 | if (msock.socket) { |
1ec861eb | 951 | drbd_warn(connection, "initial packet M crossed\n"); |
7da35862 | 952 | sock_release(msock.socket); |
80c6eed4 PR |
953 | msock.socket = s; |
954 | goto randomize; | |
b411b363 | 955 | } |
7da35862 | 956 | msock.socket = s; |
b411b363 PR |
957 | break; |
958 | default: | |
1ec861eb | 959 | drbd_warn(connection, "Error receiving initial packet\n"); |
b411b363 | 960 | sock_release(s); |
80c6eed4 | 961 | randomize: |
38b682b2 | 962 | if (prandom_u32() & 1) |
b411b363 PR |
963 | goto retry; |
964 | } | |
965 | } | |
966 | ||
bde89a9e | 967 | if (connection->cstate <= C_DISCONNECTING) |
b411b363 PR |
968 | goto out_release_sockets; |
969 | if (signal_pending(current)) { | |
970 | flush_signals(current); | |
971 | smp_rmb(); | |
bde89a9e | 972 | if (get_t_state(&connection->receiver) == EXITING) |
b411b363 PR |
973 | goto out_release_sockets; |
974 | } | |
975 | ||
b666dbf8 PR |
976 | ok = drbd_socket_okay(&sock.socket); |
977 | ok = drbd_socket_okay(&msock.socket) && ok; | |
978 | } while (!ok); | |
b411b363 | 979 | |
7a426fd8 PR |
980 | if (ad.s_listen) |
981 | sock_release(ad.s_listen); | |
b411b363 | 982 | |
98683650 PR |
983 | sock.socket->sk->sk_reuse = SK_CAN_REUSE; /* SO_REUSEADDR */ |
984 | msock.socket->sk->sk_reuse = SK_CAN_REUSE; /* SO_REUSEADDR */ | |
b411b363 | 985 | |
7da35862 PR |
986 | sock.socket->sk->sk_allocation = GFP_NOIO; |
987 | msock.socket->sk->sk_allocation = GFP_NOIO; | |
b411b363 | 988 | |
7da35862 PR |
989 | sock.socket->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; |
990 | msock.socket->sk->sk_priority = TC_PRIO_INTERACTIVE; | |
b411b363 | 991 | |
b411b363 | 992 | /* NOT YET ... |
bde89a9e | 993 | * sock.socket->sk->sk_sndtimeo = connection->net_conf->timeout*HZ/10; |
7da35862 | 994 | * sock.socket->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; |
6038178e | 995 | * first set it to the P_CONNECTION_FEATURES timeout, |
b411b363 | 996 | * which we set to 4x the configured ping_timeout. */ |
44ed167d | 997 | rcu_read_lock(); |
bde89a9e | 998 | nc = rcu_dereference(connection->net_conf); |
44ed167d | 999 | |
7da35862 PR |
1000 | sock.socket->sk->sk_sndtimeo = |
1001 | sock.socket->sk->sk_rcvtimeo = nc->ping_timeo*4*HZ/10; | |
b411b363 | 1002 | |
7da35862 | 1003 | msock.socket->sk->sk_rcvtimeo = nc->ping_int*HZ; |
44ed167d | 1004 | timeout = nc->timeout * HZ / 10; |
08b165ba | 1005 | discard_my_data = nc->discard_my_data; |
44ed167d | 1006 | rcu_read_unlock(); |
b411b363 | 1007 | |
7da35862 | 1008 | msock.socket->sk->sk_sndtimeo = timeout; |
b411b363 PR |
1009 | |
1010 | /* we don't want delays. | |
25985edc | 1011 | * we use TCP_CORK where appropriate, though */ |
7da35862 PR |
1012 | drbd_tcp_nodelay(sock.socket); |
1013 | drbd_tcp_nodelay(msock.socket); | |
b411b363 | 1014 | |
bde89a9e AG |
1015 | connection->data.socket = sock.socket; |
1016 | connection->meta.socket = msock.socket; | |
1017 | connection->last_received = jiffies; | |
b411b363 | 1018 | |
bde89a9e | 1019 | h = drbd_do_features(connection); |
b411b363 PR |
1020 | if (h <= 0) |
1021 | return h; | |
1022 | ||
bde89a9e | 1023 | if (connection->cram_hmac_tfm) { |
b30ab791 | 1024 | /* drbd_request_state(device, NS(conn, WFAuth)); */ |
bde89a9e | 1025 | switch (drbd_do_auth(connection)) { |
b10d96cb | 1026 | case -1: |
1ec861eb | 1027 | drbd_err(connection, "Authentication of peer failed\n"); |
b411b363 | 1028 | return -1; |
b10d96cb | 1029 | case 0: |
1ec861eb | 1030 | drbd_err(connection, "Authentication of peer failed, trying again.\n"); |
b10d96cb | 1031 | return 0; |
b411b363 PR |
1032 | } |
1033 | } | |
1034 | ||
bde89a9e AG |
1035 | connection->data.socket->sk->sk_sndtimeo = timeout; |
1036 | connection->data.socket->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
b411b363 | 1037 | |
bde89a9e | 1038 | if (drbd_send_protocol(connection) == -EOPNOTSUPP) |
7e2455c1 | 1039 | return -1; |
b411b363 | 1040 | |
bde89a9e | 1041 | set_bit(STATE_SENT, &connection->flags); |
a1096a6e | 1042 | |
c141ebda | 1043 | rcu_read_lock(); |
c06ece6b AG |
1044 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
1045 | struct drbd_device *device = peer_device->device; | |
b30ab791 | 1046 | kref_get(&device->kref); |
26ea8f92 AG |
1047 | rcu_read_unlock(); |
1048 | ||
13c76aba PR |
1049 | /* Prevent a race between resync-handshake and |
1050 | * being promoted to Primary. | |
1051 | * | |
1052 | * Grab and release the state mutex, so we know that any current | |
1053 | * drbd_set_role() is finished, and any incoming drbd_set_role | |
1054 | * will see the STATE_SENT flag, and wait for it to be cleared. | |
1055 | */ | |
b30ab791 AG |
1056 | mutex_lock(device->state_mutex); |
1057 | mutex_unlock(device->state_mutex); | |
13c76aba | 1058 | |
08b165ba | 1059 | if (discard_my_data) |
b30ab791 | 1060 | set_bit(DISCARD_MY_DATA, &device->flags); |
08b165ba | 1061 | else |
b30ab791 | 1062 | clear_bit(DISCARD_MY_DATA, &device->flags); |
08b165ba | 1063 | |
69a22773 | 1064 | drbd_connected(peer_device); |
05a10ec7 | 1065 | kref_put(&device->kref, drbd_destroy_device); |
c141ebda PR |
1066 | rcu_read_lock(); |
1067 | } | |
1068 | rcu_read_unlock(); | |
1069 | ||
bde89a9e AG |
1070 | rv = conn_request_state(connection, NS(conn, C_WF_REPORT_PARAMS), CS_VERBOSE); |
1071 | if (rv < SS_SUCCESS || connection->cstate != C_WF_REPORT_PARAMS) { | |
1072 | clear_bit(STATE_SENT, &connection->flags); | |
1e86ac48 | 1073 | return 0; |
a1096a6e | 1074 | } |
1e86ac48 | 1075 | |
bde89a9e | 1076 | drbd_thread_start(&connection->asender); |
b411b363 | 1077 | |
0500813f | 1078 | mutex_lock(&connection->resource->conf_update); |
08b165ba PR |
1079 | /* The discard_my_data flag is a single-shot modifier to the next |
1080 | * connection attempt, the handshake of which is now well underway. | |
1081 | * No need for rcu style copying of the whole struct | |
1082 | * just to clear a single value. */ | |
bde89a9e | 1083 | connection->net_conf->discard_my_data = 0; |
0500813f | 1084 | mutex_unlock(&connection->resource->conf_update); |
08b165ba | 1085 | |
d3fcb490 | 1086 | return h; |
b411b363 PR |
1087 | |
1088 | out_release_sockets: | |
7a426fd8 PR |
1089 | if (ad.s_listen) |
1090 | sock_release(ad.s_listen); | |
7da35862 PR |
1091 | if (sock.socket) |
1092 | sock_release(sock.socket); | |
1093 | if (msock.socket) | |
1094 | sock_release(msock.socket); | |
b411b363 PR |
1095 | return -1; |
1096 | } | |
1097 | ||
bde89a9e | 1098 | static int decode_header(struct drbd_connection *connection, void *header, struct packet_info *pi) |
b411b363 | 1099 | { |
bde89a9e | 1100 | unsigned int header_size = drbd_header_size(connection); |
e658983a | 1101 | |
0c8e36d9 AG |
1102 | if (header_size == sizeof(struct p_header100) && |
1103 | *(__be32 *)header == cpu_to_be32(DRBD_MAGIC_100)) { | |
1104 | struct p_header100 *h = header; | |
1105 | if (h->pad != 0) { | |
1ec861eb | 1106 | drbd_err(connection, "Header padding is not zero\n"); |
0c8e36d9 AG |
1107 | return -EINVAL; |
1108 | } | |
1109 | pi->vnr = be16_to_cpu(h->volume); | |
1110 | pi->cmd = be16_to_cpu(h->command); | |
1111 | pi->size = be32_to_cpu(h->length); | |
1112 | } else if (header_size == sizeof(struct p_header95) && | |
1113 | *(__be16 *)header == cpu_to_be16(DRBD_MAGIC_BIG)) { | |
e658983a | 1114 | struct p_header95 *h = header; |
e658983a | 1115 | pi->cmd = be16_to_cpu(h->command); |
b55d84ba AG |
1116 | pi->size = be32_to_cpu(h->length); |
1117 | pi->vnr = 0; | |
e658983a AG |
1118 | } else if (header_size == sizeof(struct p_header80) && |
1119 | *(__be32 *)header == cpu_to_be32(DRBD_MAGIC)) { | |
1120 | struct p_header80 *h = header; | |
1121 | pi->cmd = be16_to_cpu(h->command); | |
1122 | pi->size = be16_to_cpu(h->length); | |
77351055 | 1123 | pi->vnr = 0; |
02918be2 | 1124 | } else { |
1ec861eb | 1125 | drbd_err(connection, "Wrong magic value 0x%08x in protocol version %d\n", |
e658983a | 1126 | be32_to_cpu(*(__be32 *)header), |
bde89a9e | 1127 | connection->agreed_pro_version); |
8172f3e9 | 1128 | return -EINVAL; |
b411b363 | 1129 | } |
e658983a | 1130 | pi->data = header + header_size; |
8172f3e9 | 1131 | return 0; |
257d0af6 | 1132 | } |
b411b363 | 1133 | |
bde89a9e | 1134 | static int drbd_recv_header(struct drbd_connection *connection, struct packet_info *pi) |
257d0af6 | 1135 | { |
bde89a9e | 1136 | void *buffer = connection->data.rbuf; |
69bc7bc3 | 1137 | int err; |
257d0af6 | 1138 | |
bde89a9e | 1139 | err = drbd_recv_all_warn(connection, buffer, drbd_header_size(connection)); |
a5c31904 | 1140 | if (err) |
69bc7bc3 | 1141 | return err; |
257d0af6 | 1142 | |
bde89a9e AG |
1143 | err = decode_header(connection, buffer, pi); |
1144 | connection->last_received = jiffies; | |
b411b363 | 1145 | |
69bc7bc3 | 1146 | return err; |
b411b363 PR |
1147 | } |
1148 | ||
bde89a9e | 1149 | static void drbd_flush(struct drbd_connection *connection) |
b411b363 PR |
1150 | { |
1151 | int rv; | |
c06ece6b | 1152 | struct drbd_peer_device *peer_device; |
4b0007c0 PR |
1153 | int vnr; |
1154 | ||
bde89a9e | 1155 | if (connection->write_ordering >= WO_bdev_flush) { |
615e087f | 1156 | rcu_read_lock(); |
c06ece6b AG |
1157 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
1158 | struct drbd_device *device = peer_device->device; | |
1159 | ||
b30ab791 | 1160 | if (!get_ldev(device)) |
615e087f | 1161 | continue; |
b30ab791 | 1162 | kref_get(&device->kref); |
615e087f LE |
1163 | rcu_read_unlock(); |
1164 | ||
b30ab791 | 1165 | rv = blkdev_issue_flush(device->ldev->backing_bdev, |
615e087f LE |
1166 | GFP_NOIO, NULL); |
1167 | if (rv) { | |
d0180171 | 1168 | drbd_info(device, "local disk flush failed with status %d\n", rv); |
615e087f LE |
1169 | /* would rather check on EOPNOTSUPP, but that is not reliable. |
1170 | * don't try again for ANY return value != 0 | |
1171 | * if (rv == -EOPNOTSUPP) */ | |
bde89a9e | 1172 | drbd_bump_write_ordering(connection, WO_drain_io); |
4b0007c0 | 1173 | } |
b30ab791 | 1174 | put_ldev(device); |
05a10ec7 | 1175 | kref_put(&device->kref, drbd_destroy_device); |
b411b363 | 1176 | |
615e087f LE |
1177 | rcu_read_lock(); |
1178 | if (rv) | |
1179 | break; | |
b411b363 | 1180 | } |
615e087f | 1181 | rcu_read_unlock(); |
b411b363 | 1182 | } |
b411b363 PR |
1183 | } |
1184 | ||
1185 | /** | |
1186 | * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. | |
b30ab791 | 1187 | * @device: DRBD device. |
b411b363 PR |
1188 | * @epoch: Epoch object. |
1189 | * @ev: Epoch event. | |
1190 | */ | |
bde89a9e | 1191 | static enum finish_epoch drbd_may_finish_epoch(struct drbd_connection *connection, |
b411b363 PR |
1192 | struct drbd_epoch *epoch, |
1193 | enum epoch_event ev) | |
1194 | { | |
2451fc3b | 1195 | int epoch_size; |
b411b363 | 1196 | struct drbd_epoch *next_epoch; |
b411b363 PR |
1197 | enum finish_epoch rv = FE_STILL_LIVE; |
1198 | ||
bde89a9e | 1199 | spin_lock(&connection->epoch_lock); |
b411b363 PR |
1200 | do { |
1201 | next_epoch = NULL; | |
b411b363 PR |
1202 | |
1203 | epoch_size = atomic_read(&epoch->epoch_size); | |
1204 | ||
1205 | switch (ev & ~EV_CLEANUP) { | |
1206 | case EV_PUT: | |
1207 | atomic_dec(&epoch->active); | |
1208 | break; | |
1209 | case EV_GOT_BARRIER_NR: | |
1210 | set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); | |
b411b363 PR |
1211 | break; |
1212 | case EV_BECAME_LAST: | |
1213 | /* nothing to do*/ | |
1214 | break; | |
1215 | } | |
1216 | ||
b411b363 PR |
1217 | if (epoch_size != 0 && |
1218 | atomic_read(&epoch->active) == 0 && | |
80f9fd55 | 1219 | (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags) || ev & EV_CLEANUP)) { |
b411b363 | 1220 | if (!(ev & EV_CLEANUP)) { |
bde89a9e AG |
1221 | spin_unlock(&connection->epoch_lock); |
1222 | drbd_send_b_ack(epoch->connection, epoch->barrier_nr, epoch_size); | |
1223 | spin_lock(&connection->epoch_lock); | |
b411b363 | 1224 | } |
9ed57dcb LE |
1225 | #if 0 |
1226 | /* FIXME: dec unacked on connection, once we have | |
1227 | * something to count pending connection packets in. */ | |
80f9fd55 | 1228 | if (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) |
bde89a9e | 1229 | dec_unacked(epoch->connection); |
9ed57dcb | 1230 | #endif |
b411b363 | 1231 | |
bde89a9e | 1232 | if (connection->current_epoch != epoch) { |
b411b363 PR |
1233 | next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); |
1234 | list_del(&epoch->list); | |
1235 | ev = EV_BECAME_LAST | (ev & EV_CLEANUP); | |
bde89a9e | 1236 | connection->epochs--; |
b411b363 PR |
1237 | kfree(epoch); |
1238 | ||
1239 | if (rv == FE_STILL_LIVE) | |
1240 | rv = FE_DESTROYED; | |
1241 | } else { | |
1242 | epoch->flags = 0; | |
1243 | atomic_set(&epoch->epoch_size, 0); | |
698f9315 | 1244 | /* atomic_set(&epoch->active, 0); is already zero */ |
b411b363 PR |
1245 | if (rv == FE_STILL_LIVE) |
1246 | rv = FE_RECYCLED; | |
1247 | } | |
1248 | } | |
1249 | ||
1250 | if (!next_epoch) | |
1251 | break; | |
1252 | ||
1253 | epoch = next_epoch; | |
1254 | } while (1); | |
1255 | ||
bde89a9e | 1256 | spin_unlock(&connection->epoch_lock); |
b411b363 | 1257 | |
b411b363 PR |
1258 | return rv; |
1259 | } | |
1260 | ||
1261 | /** | |
1262 | * drbd_bump_write_ordering() - Fall back to an other write ordering method | |
bde89a9e | 1263 | * @connection: DRBD connection. |
b411b363 PR |
1264 | * @wo: Write ordering method to try. |
1265 | */ | |
bde89a9e | 1266 | void drbd_bump_write_ordering(struct drbd_connection *connection, enum write_ordering_e wo) |
b411b363 | 1267 | { |
daeda1cc | 1268 | struct disk_conf *dc; |
c06ece6b | 1269 | struct drbd_peer_device *peer_device; |
b411b363 | 1270 | enum write_ordering_e pwo; |
4b0007c0 | 1271 | int vnr; |
b411b363 PR |
1272 | static char *write_ordering_str[] = { |
1273 | [WO_none] = "none", | |
1274 | [WO_drain_io] = "drain", | |
1275 | [WO_bdev_flush] = "flush", | |
b411b363 PR |
1276 | }; |
1277 | ||
bde89a9e | 1278 | pwo = connection->write_ordering; |
b411b363 | 1279 | wo = min(pwo, wo); |
daeda1cc | 1280 | rcu_read_lock(); |
c06ece6b AG |
1281 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
1282 | struct drbd_device *device = peer_device->device; | |
1283 | ||
b30ab791 | 1284 | if (!get_ldev_if_state(device, D_ATTACHING)) |
4b0007c0 | 1285 | continue; |
b30ab791 | 1286 | dc = rcu_dereference(device->ldev->disk_conf); |
4b0007c0 PR |
1287 | |
1288 | if (wo == WO_bdev_flush && !dc->disk_flushes) | |
1289 | wo = WO_drain_io; | |
1290 | if (wo == WO_drain_io && !dc->disk_drain) | |
1291 | wo = WO_none; | |
b30ab791 | 1292 | put_ldev(device); |
4b0007c0 | 1293 | } |
daeda1cc | 1294 | rcu_read_unlock(); |
bde89a9e AG |
1295 | connection->write_ordering = wo; |
1296 | if (pwo != connection->write_ordering || wo == WO_bdev_flush) | |
1ec861eb | 1297 | drbd_info(connection, "Method to ensure write ordering: %s\n", write_ordering_str[connection->write_ordering]); |
b411b363 PR |
1298 | } |
1299 | ||
45bb912b | 1300 | /** |
fbe29dec | 1301 | * drbd_submit_peer_request() |
b30ab791 | 1302 | * @device: DRBD device. |
db830c46 | 1303 | * @peer_req: peer request |
45bb912b | 1304 | * @rw: flag field, see bio->bi_rw |
10f6d992 LE |
1305 | * |
1306 | * May spread the pages to multiple bios, | |
1307 | * depending on bio_add_page restrictions. | |
1308 | * | |
1309 | * Returns 0 if all bios have been submitted, | |
1310 | * -ENOMEM if we could not allocate enough bios, | |
1311 | * -ENOSPC (any better suggestion?) if we have not been able to bio_add_page a | |
1312 | * single page to an empty bio (which should never happen and likely indicates | |
1313 | * that the lower level IO stack is in some way broken). This has been observed | |
1314 | * on certain Xen deployments. | |
45bb912b LE |
1315 | */ |
1316 | /* TODO allocate from our own bio_set. */ | |
b30ab791 | 1317 | int drbd_submit_peer_request(struct drbd_device *device, |
fbe29dec AG |
1318 | struct drbd_peer_request *peer_req, |
1319 | const unsigned rw, const int fault_type) | |
45bb912b LE |
1320 | { |
1321 | struct bio *bios = NULL; | |
1322 | struct bio *bio; | |
db830c46 AG |
1323 | struct page *page = peer_req->pages; |
1324 | sector_t sector = peer_req->i.sector; | |
1325 | unsigned ds = peer_req->i.size; | |
45bb912b LE |
1326 | unsigned n_bios = 0; |
1327 | unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT; | |
10f6d992 | 1328 | int err = -ENOMEM; |
45bb912b LE |
1329 | |
1330 | /* In most cases, we will only need one bio. But in case the lower | |
1331 | * level restrictions happen to be different at this offset on this | |
1332 | * side than those of the sending peer, we may need to submit the | |
9476f39d LE |
1333 | * request in more than one bio. |
1334 | * | |
1335 | * Plain bio_alloc is good enough here, this is no DRBD internally | |
1336 | * generated bio, but a bio allocated on behalf of the peer. | |
1337 | */ | |
45bb912b LE |
1338 | next_bio: |
1339 | bio = bio_alloc(GFP_NOIO, nr_pages); | |
1340 | if (!bio) { | |
d0180171 | 1341 | drbd_err(device, "submit_ee: Allocation of a bio failed\n"); |
45bb912b LE |
1342 | goto fail; |
1343 | } | |
db830c46 | 1344 | /* > peer_req->i.sector, unless this is the first bio */ |
4f024f37 | 1345 | bio->bi_iter.bi_sector = sector; |
b30ab791 | 1346 | bio->bi_bdev = device->ldev->backing_bdev; |
45bb912b | 1347 | bio->bi_rw = rw; |
db830c46 | 1348 | bio->bi_private = peer_req; |
fcefa62e | 1349 | bio->bi_end_io = drbd_peer_request_endio; |
45bb912b LE |
1350 | |
1351 | bio->bi_next = bios; | |
1352 | bios = bio; | |
1353 | ++n_bios; | |
1354 | ||
1355 | page_chain_for_each(page) { | |
1356 | unsigned len = min_t(unsigned, ds, PAGE_SIZE); | |
1357 | if (!bio_add_page(bio, page, len, 0)) { | |
10f6d992 LE |
1358 | /* A single page must always be possible! |
1359 | * But in case it fails anyways, | |
1360 | * we deal with it, and complain (below). */ | |
1361 | if (bio->bi_vcnt == 0) { | |
d0180171 | 1362 | drbd_err(device, |
10f6d992 LE |
1363 | "bio_add_page failed for len=%u, " |
1364 | "bi_vcnt=0 (bi_sector=%llu)\n", | |
4f024f37 | 1365 | len, (uint64_t)bio->bi_iter.bi_sector); |
10f6d992 LE |
1366 | err = -ENOSPC; |
1367 | goto fail; | |
1368 | } | |
45bb912b LE |
1369 | goto next_bio; |
1370 | } | |
1371 | ds -= len; | |
1372 | sector += len >> 9; | |
1373 | --nr_pages; | |
1374 | } | |
0b0ba1ef AG |
1375 | D_ASSERT(device, page == NULL); |
1376 | D_ASSERT(device, ds == 0); | |
45bb912b | 1377 | |
db830c46 | 1378 | atomic_set(&peer_req->pending_bios, n_bios); |
45bb912b LE |
1379 | do { |
1380 | bio = bios; | |
1381 | bios = bios->bi_next; | |
1382 | bio->bi_next = NULL; | |
1383 | ||
b30ab791 | 1384 | drbd_generic_make_request(device, fault_type, bio); |
45bb912b | 1385 | } while (bios); |
45bb912b LE |
1386 | return 0; |
1387 | ||
1388 | fail: | |
1389 | while (bios) { | |
1390 | bio = bios; | |
1391 | bios = bios->bi_next; | |
1392 | bio_put(bio); | |
1393 | } | |
10f6d992 | 1394 | return err; |
45bb912b LE |
1395 | } |
1396 | ||
b30ab791 | 1397 | static void drbd_remove_epoch_entry_interval(struct drbd_device *device, |
db830c46 | 1398 | struct drbd_peer_request *peer_req) |
53840641 | 1399 | { |
db830c46 | 1400 | struct drbd_interval *i = &peer_req->i; |
53840641 | 1401 | |
b30ab791 | 1402 | drbd_remove_interval(&device->write_requests, i); |
53840641 AG |
1403 | drbd_clear_interval(i); |
1404 | ||
6c852bec | 1405 | /* Wake up any processes waiting for this peer request to complete. */ |
53840641 | 1406 | if (i->waiting) |
b30ab791 | 1407 | wake_up(&device->misc_wait); |
53840641 AG |
1408 | } |
1409 | ||
bde89a9e | 1410 | static void conn_wait_active_ee_empty(struct drbd_connection *connection) |
77fede51 | 1411 | { |
c06ece6b | 1412 | struct drbd_peer_device *peer_device; |
77fede51 PR |
1413 | int vnr; |
1414 | ||
1415 | rcu_read_lock(); | |
c06ece6b AG |
1416 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
1417 | struct drbd_device *device = peer_device->device; | |
1418 | ||
b30ab791 | 1419 | kref_get(&device->kref); |
77fede51 | 1420 | rcu_read_unlock(); |
b30ab791 | 1421 | drbd_wait_ee_list_empty(device, &device->active_ee); |
05a10ec7 | 1422 | kref_put(&device->kref, drbd_destroy_device); |
77fede51 PR |
1423 | rcu_read_lock(); |
1424 | } | |
1425 | rcu_read_unlock(); | |
1426 | } | |
1427 | ||
9f4fe9ad AG |
1428 | static struct drbd_peer_device * |
1429 | conn_peer_device(struct drbd_connection *connection, int volume_number) | |
1430 | { | |
1431 | return idr_find(&connection->peer_devices, volume_number); | |
1432 | } | |
1433 | ||
bde89a9e | 1434 | static int receive_Barrier(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 1435 | { |
2451fc3b | 1436 | int rv; |
e658983a | 1437 | struct p_barrier *p = pi->data; |
b411b363 PR |
1438 | struct drbd_epoch *epoch; |
1439 | ||
9ed57dcb LE |
1440 | /* FIXME these are unacked on connection, |
1441 | * not a specific (peer)device. | |
1442 | */ | |
bde89a9e AG |
1443 | connection->current_epoch->barrier_nr = p->barrier; |
1444 | connection->current_epoch->connection = connection; | |
1445 | rv = drbd_may_finish_epoch(connection, connection->current_epoch, EV_GOT_BARRIER_NR); | |
b411b363 PR |
1446 | |
1447 | /* P_BARRIER_ACK may imply that the corresponding extent is dropped from | |
1448 | * the activity log, which means it would not be resynced in case the | |
1449 | * R_PRIMARY crashes now. | |
1450 | * Therefore we must send the barrier_ack after the barrier request was | |
1451 | * completed. */ | |
bde89a9e | 1452 | switch (connection->write_ordering) { |
b411b363 PR |
1453 | case WO_none: |
1454 | if (rv == FE_RECYCLED) | |
82bc0194 | 1455 | return 0; |
2451fc3b PR |
1456 | |
1457 | /* receiver context, in the writeout path of the other node. | |
1458 | * avoid potential distributed deadlock */ | |
1459 | epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); | |
1460 | if (epoch) | |
1461 | break; | |
1462 | else | |
1ec861eb | 1463 | drbd_warn(connection, "Allocation of an epoch failed, slowing down\n"); |
2451fc3b | 1464 | /* Fall through */ |
b411b363 PR |
1465 | |
1466 | case WO_bdev_flush: | |
1467 | case WO_drain_io: | |
bde89a9e AG |
1468 | conn_wait_active_ee_empty(connection); |
1469 | drbd_flush(connection); | |
2451fc3b | 1470 | |
bde89a9e | 1471 | if (atomic_read(&connection->current_epoch->epoch_size)) { |
2451fc3b PR |
1472 | epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); |
1473 | if (epoch) | |
1474 | break; | |
b411b363 PR |
1475 | } |
1476 | ||
82bc0194 | 1477 | return 0; |
2451fc3b | 1478 | default: |
1ec861eb | 1479 | drbd_err(connection, "Strangeness in connection->write_ordering %d\n", connection->write_ordering); |
82bc0194 | 1480 | return -EIO; |
b411b363 PR |
1481 | } |
1482 | ||
1483 | epoch->flags = 0; | |
1484 | atomic_set(&epoch->epoch_size, 0); | |
1485 | atomic_set(&epoch->active, 0); | |
1486 | ||
bde89a9e AG |
1487 | spin_lock(&connection->epoch_lock); |
1488 | if (atomic_read(&connection->current_epoch->epoch_size)) { | |
1489 | list_add(&epoch->list, &connection->current_epoch->list); | |
1490 | connection->current_epoch = epoch; | |
1491 | connection->epochs++; | |
b411b363 PR |
1492 | } else { |
1493 | /* The current_epoch got recycled while we allocated this one... */ | |
1494 | kfree(epoch); | |
1495 | } | |
bde89a9e | 1496 | spin_unlock(&connection->epoch_lock); |
b411b363 | 1497 | |
82bc0194 | 1498 | return 0; |
b411b363 PR |
1499 | } |
1500 | ||
1501 | /* used from receive_RSDataReply (recv_resync_read) | |
1502 | * and from receive_Data */ | |
f6ffca9f | 1503 | static struct drbd_peer_request * |
69a22773 | 1504 | read_in_block(struct drbd_peer_device *peer_device, u64 id, sector_t sector, |
f6ffca9f | 1505 | int data_size) __must_hold(local) |
b411b363 | 1506 | { |
69a22773 | 1507 | struct drbd_device *device = peer_device->device; |
b30ab791 | 1508 | const sector_t capacity = drbd_get_capacity(device->this_bdev); |
db830c46 | 1509 | struct drbd_peer_request *peer_req; |
b411b363 | 1510 | struct page *page; |
a5c31904 | 1511 | int dgs, ds, err; |
69a22773 AG |
1512 | void *dig_in = peer_device->connection->int_dig_in; |
1513 | void *dig_vv = peer_device->connection->int_dig_vv; | |
6b4388ac | 1514 | unsigned long *data; |
b411b363 | 1515 | |
88104ca4 | 1516 | dgs = 0; |
69a22773 AG |
1517 | if (peer_device->connection->peer_integrity_tfm) { |
1518 | dgs = crypto_hash_digestsize(peer_device->connection->peer_integrity_tfm); | |
9f5bdc33 AG |
1519 | /* |
1520 | * FIXME: Receive the incoming digest into the receive buffer | |
1521 | * here, together with its struct p_data? | |
1522 | */ | |
69a22773 | 1523 | err = drbd_recv_all_warn(peer_device->connection, dig_in, dgs); |
a5c31904 | 1524 | if (err) |
b411b363 | 1525 | return NULL; |
88104ca4 | 1526 | data_size -= dgs; |
b411b363 PR |
1527 | } |
1528 | ||
841ce241 AG |
1529 | if (!expect(IS_ALIGNED(data_size, 512))) |
1530 | return NULL; | |
1531 | if (!expect(data_size <= DRBD_MAX_BIO_SIZE)) | |
1532 | return NULL; | |
b411b363 | 1533 | |
6666032a LE |
1534 | /* even though we trust out peer, |
1535 | * we sometimes have to double check. */ | |
1536 | if (sector + (data_size>>9) > capacity) { | |
d0180171 | 1537 | drbd_err(device, "request from peer beyond end of local disk: " |
fdda6544 | 1538 | "capacity: %llus < sector: %llus + size: %u\n", |
6666032a LE |
1539 | (unsigned long long)capacity, |
1540 | (unsigned long long)sector, data_size); | |
1541 | return NULL; | |
1542 | } | |
1543 | ||
b411b363 PR |
1544 | /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD |
1545 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
1546 | * which in turn might block on the other node at this very place. */ | |
69a22773 | 1547 | peer_req = drbd_alloc_peer_req(peer_device, id, sector, data_size, GFP_NOIO); |
db830c46 | 1548 | if (!peer_req) |
b411b363 | 1549 | return NULL; |
45bb912b | 1550 | |
a73ff323 | 1551 | if (!data_size) |
81a3537a | 1552 | return peer_req; |
a73ff323 | 1553 | |
b411b363 | 1554 | ds = data_size; |
db830c46 | 1555 | page = peer_req->pages; |
45bb912b LE |
1556 | page_chain_for_each(page) { |
1557 | unsigned len = min_t(int, ds, PAGE_SIZE); | |
6b4388ac | 1558 | data = kmap(page); |
69a22773 | 1559 | err = drbd_recv_all_warn(peer_device->connection, data, len); |
b30ab791 | 1560 | if (drbd_insert_fault(device, DRBD_FAULT_RECEIVE)) { |
d0180171 | 1561 | drbd_err(device, "Fault injection: Corrupting data on receive\n"); |
6b4388ac PR |
1562 | data[0] = data[0] ^ (unsigned long)-1; |
1563 | } | |
b411b363 | 1564 | kunmap(page); |
a5c31904 | 1565 | if (err) { |
b30ab791 | 1566 | drbd_free_peer_req(device, peer_req); |
b411b363 PR |
1567 | return NULL; |
1568 | } | |
a5c31904 | 1569 | ds -= len; |
b411b363 PR |
1570 | } |
1571 | ||
1572 | if (dgs) { | |
69a22773 | 1573 | drbd_csum_ee(peer_device->connection->peer_integrity_tfm, peer_req, dig_vv); |
b411b363 | 1574 | if (memcmp(dig_in, dig_vv, dgs)) { |
d0180171 | 1575 | drbd_err(device, "Digest integrity check FAILED: %llus +%u\n", |
470be44a | 1576 | (unsigned long long)sector, data_size); |
b30ab791 | 1577 | drbd_free_peer_req(device, peer_req); |
b411b363 PR |
1578 | return NULL; |
1579 | } | |
1580 | } | |
b30ab791 | 1581 | device->recv_cnt += data_size>>9; |
db830c46 | 1582 | return peer_req; |
b411b363 PR |
1583 | } |
1584 | ||
1585 | /* drbd_drain_block() just takes a data block | |
1586 | * out of the socket input buffer, and discards it. | |
1587 | */ | |
69a22773 | 1588 | static int drbd_drain_block(struct drbd_peer_device *peer_device, int data_size) |
b411b363 PR |
1589 | { |
1590 | struct page *page; | |
a5c31904 | 1591 | int err = 0; |
b411b363 PR |
1592 | void *data; |
1593 | ||
c3470cde | 1594 | if (!data_size) |
fc5be839 | 1595 | return 0; |
c3470cde | 1596 | |
69a22773 | 1597 | page = drbd_alloc_pages(peer_device, 1, 1); |
b411b363 PR |
1598 | |
1599 | data = kmap(page); | |
1600 | while (data_size) { | |
fc5be839 AG |
1601 | unsigned int len = min_t(int, data_size, PAGE_SIZE); |
1602 | ||
69a22773 | 1603 | err = drbd_recv_all_warn(peer_device->connection, data, len); |
a5c31904 | 1604 | if (err) |
b411b363 | 1605 | break; |
a5c31904 | 1606 | data_size -= len; |
b411b363 PR |
1607 | } |
1608 | kunmap(page); | |
69a22773 | 1609 | drbd_free_pages(peer_device->device, page, 0); |
fc5be839 | 1610 | return err; |
b411b363 PR |
1611 | } |
1612 | ||
69a22773 | 1613 | static int recv_dless_read(struct drbd_peer_device *peer_device, struct drbd_request *req, |
b411b363 PR |
1614 | sector_t sector, int data_size) |
1615 | { | |
7988613b KO |
1616 | struct bio_vec bvec; |
1617 | struct bvec_iter iter; | |
b411b363 | 1618 | struct bio *bio; |
7988613b | 1619 | int dgs, err, expect; |
69a22773 AG |
1620 | void *dig_in = peer_device->connection->int_dig_in; |
1621 | void *dig_vv = peer_device->connection->int_dig_vv; | |
b411b363 | 1622 | |
88104ca4 | 1623 | dgs = 0; |
69a22773 AG |
1624 | if (peer_device->connection->peer_integrity_tfm) { |
1625 | dgs = crypto_hash_digestsize(peer_device->connection->peer_integrity_tfm); | |
1626 | err = drbd_recv_all_warn(peer_device->connection, dig_in, dgs); | |
a5c31904 AG |
1627 | if (err) |
1628 | return err; | |
88104ca4 | 1629 | data_size -= dgs; |
b411b363 PR |
1630 | } |
1631 | ||
b411b363 PR |
1632 | /* optimistically update recv_cnt. if receiving fails below, |
1633 | * we disconnect anyways, and counters will be reset. */ | |
69a22773 | 1634 | peer_device->device->recv_cnt += data_size>>9; |
b411b363 PR |
1635 | |
1636 | bio = req->master_bio; | |
69a22773 | 1637 | D_ASSERT(peer_device->device, sector == bio->bi_iter.bi_sector); |
b411b363 | 1638 | |
7988613b KO |
1639 | bio_for_each_segment(bvec, bio, iter) { |
1640 | void *mapped = kmap(bvec.bv_page) + bvec.bv_offset; | |
1641 | expect = min_t(int, data_size, bvec.bv_len); | |
69a22773 | 1642 | err = drbd_recv_all_warn(peer_device->connection, mapped, expect); |
7988613b | 1643 | kunmap(bvec.bv_page); |
a5c31904 AG |
1644 | if (err) |
1645 | return err; | |
1646 | data_size -= expect; | |
b411b363 PR |
1647 | } |
1648 | ||
1649 | if (dgs) { | |
69a22773 | 1650 | drbd_csum_bio(peer_device->connection->peer_integrity_tfm, bio, dig_vv); |
b411b363 | 1651 | if (memcmp(dig_in, dig_vv, dgs)) { |
69a22773 | 1652 | drbd_err(peer_device, "Digest integrity check FAILED. Broken NICs?\n"); |
28284cef | 1653 | return -EINVAL; |
b411b363 PR |
1654 | } |
1655 | } | |
1656 | ||
69a22773 | 1657 | D_ASSERT(peer_device->device, data_size == 0); |
28284cef | 1658 | return 0; |
b411b363 PR |
1659 | } |
1660 | ||
a990be46 AG |
1661 | /* |
1662 | * e_end_resync_block() is called in asender context via | |
1663 | * drbd_finish_peer_reqs(). | |
1664 | */ | |
99920dc5 | 1665 | static int e_end_resync_block(struct drbd_work *w, int unused) |
b411b363 | 1666 | { |
8050e6d0 AG |
1667 | struct drbd_peer_request *peer_req = |
1668 | container_of(w, struct drbd_peer_request, w); | |
b30ab791 | 1669 | struct drbd_device *device = w->device; |
db830c46 | 1670 | sector_t sector = peer_req->i.sector; |
99920dc5 | 1671 | int err; |
b411b363 | 1672 | |
0b0ba1ef | 1673 | D_ASSERT(device, drbd_interval_empty(&peer_req->i)); |
b411b363 | 1674 | |
db830c46 | 1675 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
b30ab791 | 1676 | drbd_set_in_sync(device, sector, peer_req->i.size); |
69a22773 | 1677 | err = drbd_send_ack(first_peer_device(device), P_RS_WRITE_ACK, peer_req); |
b411b363 PR |
1678 | } else { |
1679 | /* Record failure to sync */ | |
b30ab791 | 1680 | drbd_rs_failed_io(device, sector, peer_req->i.size); |
b411b363 | 1681 | |
69a22773 | 1682 | err = drbd_send_ack(first_peer_device(device), P_NEG_ACK, peer_req); |
b411b363 | 1683 | } |
b30ab791 | 1684 | dec_unacked(device); |
b411b363 | 1685 | |
99920dc5 | 1686 | return err; |
b411b363 PR |
1687 | } |
1688 | ||
69a22773 AG |
1689 | static int recv_resync_read(struct drbd_peer_device *peer_device, sector_t sector, |
1690 | int data_size) __releases(local) | |
b411b363 | 1691 | { |
69a22773 | 1692 | struct drbd_device *device = peer_device->device; |
db830c46 | 1693 | struct drbd_peer_request *peer_req; |
b411b363 | 1694 | |
69a22773 | 1695 | peer_req = read_in_block(peer_device, ID_SYNCER, sector, data_size); |
db830c46 | 1696 | if (!peer_req) |
45bb912b | 1697 | goto fail; |
b411b363 | 1698 | |
b30ab791 | 1699 | dec_rs_pending(device); |
b411b363 | 1700 | |
b30ab791 | 1701 | inc_unacked(device); |
b411b363 PR |
1702 | /* corresponding dec_unacked() in e_end_resync_block() |
1703 | * respective _drbd_clear_done_ee */ | |
1704 | ||
db830c46 | 1705 | peer_req->w.cb = e_end_resync_block; |
45bb912b | 1706 | |
0500813f | 1707 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 | 1708 | list_add(&peer_req->w.list, &device->sync_ee); |
0500813f | 1709 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 | 1710 | |
b30ab791 AG |
1711 | atomic_add(data_size >> 9, &device->rs_sect_ev); |
1712 | if (drbd_submit_peer_request(device, peer_req, WRITE, DRBD_FAULT_RS_WR) == 0) | |
e1c1b0fc | 1713 | return 0; |
b411b363 | 1714 | |
10f6d992 | 1715 | /* don't care for the reason here */ |
d0180171 | 1716 | drbd_err(device, "submit failed, triggering re-connect\n"); |
0500813f | 1717 | spin_lock_irq(&device->resource->req_lock); |
db830c46 | 1718 | list_del(&peer_req->w.list); |
0500813f | 1719 | spin_unlock_irq(&device->resource->req_lock); |
22cc37a9 | 1720 | |
b30ab791 | 1721 | drbd_free_peer_req(device, peer_req); |
45bb912b | 1722 | fail: |
b30ab791 | 1723 | put_ldev(device); |
e1c1b0fc | 1724 | return -EIO; |
b411b363 PR |
1725 | } |
1726 | ||
668eebc6 | 1727 | static struct drbd_request * |
b30ab791 | 1728 | find_request(struct drbd_device *device, struct rb_root *root, u64 id, |
bc9c5c41 | 1729 | sector_t sector, bool missing_ok, const char *func) |
51624585 | 1730 | { |
51624585 AG |
1731 | struct drbd_request *req; |
1732 | ||
bc9c5c41 AG |
1733 | /* Request object according to our peer */ |
1734 | req = (struct drbd_request *)(unsigned long)id; | |
5e472264 | 1735 | if (drbd_contains_interval(root, sector, &req->i) && req->i.local) |
668eebc6 | 1736 | return req; |
c3afd8f5 | 1737 | if (!missing_ok) { |
d0180171 | 1738 | drbd_err(device, "%s: failed to find request 0x%lx, sector %llus\n", func, |
c3afd8f5 AG |
1739 | (unsigned long)id, (unsigned long long)sector); |
1740 | } | |
51624585 | 1741 | return NULL; |
b411b363 PR |
1742 | } |
1743 | ||
bde89a9e | 1744 | static int receive_DataReply(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 1745 | { |
9f4fe9ad | 1746 | struct drbd_peer_device *peer_device; |
b30ab791 | 1747 | struct drbd_device *device; |
b411b363 PR |
1748 | struct drbd_request *req; |
1749 | sector_t sector; | |
82bc0194 | 1750 | int err; |
e658983a | 1751 | struct p_data *p = pi->data; |
4a76b161 | 1752 | |
9f4fe9ad AG |
1753 | peer_device = conn_peer_device(connection, pi->vnr); |
1754 | if (!peer_device) | |
4a76b161 | 1755 | return -EIO; |
9f4fe9ad | 1756 | device = peer_device->device; |
b411b363 PR |
1757 | |
1758 | sector = be64_to_cpu(p->sector); | |
1759 | ||
0500813f | 1760 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 | 1761 | req = find_request(device, &device->read_requests, p->block_id, sector, false, __func__); |
0500813f | 1762 | spin_unlock_irq(&device->resource->req_lock); |
c3afd8f5 | 1763 | if (unlikely(!req)) |
82bc0194 | 1764 | return -EIO; |
b411b363 | 1765 | |
24c4830c | 1766 | /* hlist_del(&req->collision) is done in _req_may_be_done, to avoid |
b411b363 PR |
1767 | * special casing it there for the various failure cases. |
1768 | * still no race with drbd_fail_pending_reads */ | |
69a22773 | 1769 | err = recv_dless_read(peer_device, req, sector, pi->size); |
82bc0194 | 1770 | if (!err) |
8554df1c | 1771 | req_mod(req, DATA_RECEIVED); |
b411b363 PR |
1772 | /* else: nothing. handled from drbd_disconnect... |
1773 | * I don't think we may complete this just yet | |
1774 | * in case we are "on-disconnect: freeze" */ | |
1775 | ||
82bc0194 | 1776 | return err; |
b411b363 PR |
1777 | } |
1778 | ||
bde89a9e | 1779 | static int receive_RSDataReply(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 1780 | { |
9f4fe9ad | 1781 | struct drbd_peer_device *peer_device; |
b30ab791 | 1782 | struct drbd_device *device; |
b411b363 | 1783 | sector_t sector; |
82bc0194 | 1784 | int err; |
e658983a | 1785 | struct p_data *p = pi->data; |
4a76b161 | 1786 | |
9f4fe9ad AG |
1787 | peer_device = conn_peer_device(connection, pi->vnr); |
1788 | if (!peer_device) | |
4a76b161 | 1789 | return -EIO; |
9f4fe9ad | 1790 | device = peer_device->device; |
b411b363 PR |
1791 | |
1792 | sector = be64_to_cpu(p->sector); | |
0b0ba1ef | 1793 | D_ASSERT(device, p->block_id == ID_SYNCER); |
b411b363 | 1794 | |
b30ab791 | 1795 | if (get_ldev(device)) { |
b411b363 PR |
1796 | /* data is submitted to disk within recv_resync_read. |
1797 | * corresponding put_ldev done below on error, | |
fcefa62e | 1798 | * or in drbd_peer_request_endio. */ |
69a22773 | 1799 | err = recv_resync_read(peer_device, sector, pi->size); |
b411b363 PR |
1800 | } else { |
1801 | if (__ratelimit(&drbd_ratelimit_state)) | |
d0180171 | 1802 | drbd_err(device, "Can not write resync data to local disk.\n"); |
b411b363 | 1803 | |
69a22773 | 1804 | err = drbd_drain_block(peer_device, pi->size); |
b411b363 | 1805 | |
69a22773 | 1806 | drbd_send_ack_dp(peer_device, P_NEG_ACK, p, pi->size); |
b411b363 PR |
1807 | } |
1808 | ||
b30ab791 | 1809 | atomic_add(pi->size >> 9, &device->rs_sect_in); |
778f271d | 1810 | |
82bc0194 | 1811 | return err; |
b411b363 PR |
1812 | } |
1813 | ||
b30ab791 | 1814 | static void restart_conflicting_writes(struct drbd_device *device, |
7be8da07 | 1815 | sector_t sector, int size) |
b411b363 | 1816 | { |
7be8da07 AG |
1817 | struct drbd_interval *i; |
1818 | struct drbd_request *req; | |
1819 | ||
b30ab791 | 1820 | drbd_for_each_overlap(i, &device->write_requests, sector, size) { |
7be8da07 AG |
1821 | if (!i->local) |
1822 | continue; | |
1823 | req = container_of(i, struct drbd_request, i); | |
1824 | if (req->rq_state & RQ_LOCAL_PENDING || | |
1825 | !(req->rq_state & RQ_POSTPONED)) | |
1826 | continue; | |
2312f0b3 LE |
1827 | /* as it is RQ_POSTPONED, this will cause it to |
1828 | * be queued on the retry workqueue. */ | |
d4dabbe2 | 1829 | __req_mod(req, CONFLICT_RESOLVED, NULL); |
7be8da07 AG |
1830 | } |
1831 | } | |
b411b363 | 1832 | |
a990be46 AG |
1833 | /* |
1834 | * e_end_block() is called in asender context via drbd_finish_peer_reqs(). | |
b411b363 | 1835 | */ |
99920dc5 | 1836 | static int e_end_block(struct drbd_work *w, int cancel) |
b411b363 | 1837 | { |
8050e6d0 AG |
1838 | struct drbd_peer_request *peer_req = |
1839 | container_of(w, struct drbd_peer_request, w); | |
b30ab791 | 1840 | struct drbd_device *device = w->device; |
db830c46 | 1841 | sector_t sector = peer_req->i.sector; |
99920dc5 | 1842 | int err = 0, pcmd; |
b411b363 | 1843 | |
303d1448 | 1844 | if (peer_req->flags & EE_SEND_WRITE_ACK) { |
db830c46 | 1845 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
b30ab791 AG |
1846 | pcmd = (device->state.conn >= C_SYNC_SOURCE && |
1847 | device->state.conn <= C_PAUSED_SYNC_T && | |
db830c46 | 1848 | peer_req->flags & EE_MAY_SET_IN_SYNC) ? |
b411b363 | 1849 | P_RS_WRITE_ACK : P_WRITE_ACK; |
69a22773 | 1850 | err = drbd_send_ack(first_peer_device(device), pcmd, peer_req); |
b411b363 | 1851 | if (pcmd == P_RS_WRITE_ACK) |
b30ab791 | 1852 | drbd_set_in_sync(device, sector, peer_req->i.size); |
b411b363 | 1853 | } else { |
69a22773 | 1854 | err = drbd_send_ack(first_peer_device(device), P_NEG_ACK, peer_req); |
b411b363 PR |
1855 | /* we expect it to be marked out of sync anyways... |
1856 | * maybe assert this? */ | |
1857 | } | |
b30ab791 | 1858 | dec_unacked(device); |
b411b363 PR |
1859 | } |
1860 | /* we delete from the conflict detection hash _after_ we sent out the | |
1861 | * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ | |
302bdeae | 1862 | if (peer_req->flags & EE_IN_INTERVAL_TREE) { |
0500813f | 1863 | spin_lock_irq(&device->resource->req_lock); |
0b0ba1ef | 1864 | D_ASSERT(device, !drbd_interval_empty(&peer_req->i)); |
b30ab791 | 1865 | drbd_remove_epoch_entry_interval(device, peer_req); |
7be8da07 | 1866 | if (peer_req->flags & EE_RESTART_REQUESTS) |
b30ab791 | 1867 | restart_conflicting_writes(device, sector, peer_req->i.size); |
0500813f | 1868 | spin_unlock_irq(&device->resource->req_lock); |
bb3bfe96 | 1869 | } else |
0b0ba1ef | 1870 | D_ASSERT(device, drbd_interval_empty(&peer_req->i)); |
b411b363 | 1871 | |
a6b32bc3 | 1872 | drbd_may_finish_epoch(first_peer_device(device)->connection, peer_req->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); |
b411b363 | 1873 | |
99920dc5 | 1874 | return err; |
b411b363 PR |
1875 | } |
1876 | ||
7be8da07 | 1877 | static int e_send_ack(struct drbd_work *w, enum drbd_packet ack) |
b411b363 | 1878 | { |
b30ab791 | 1879 | struct drbd_device *device = w->device; |
8050e6d0 AG |
1880 | struct drbd_peer_request *peer_req = |
1881 | container_of(w, struct drbd_peer_request, w); | |
99920dc5 | 1882 | int err; |
b411b363 | 1883 | |
69a22773 | 1884 | err = drbd_send_ack(first_peer_device(device), ack, peer_req); |
b30ab791 | 1885 | dec_unacked(device); |
b411b363 | 1886 | |
99920dc5 | 1887 | return err; |
b411b363 PR |
1888 | } |
1889 | ||
d4dabbe2 | 1890 | static int e_send_superseded(struct drbd_work *w, int unused) |
7be8da07 | 1891 | { |
d4dabbe2 | 1892 | return e_send_ack(w, P_SUPERSEDED); |
7be8da07 AG |
1893 | } |
1894 | ||
99920dc5 | 1895 | static int e_send_retry_write(struct drbd_work *w, int unused) |
7be8da07 | 1896 | { |
a6b32bc3 | 1897 | struct drbd_connection *connection = first_peer_device(w->device)->connection; |
7be8da07 | 1898 | |
bde89a9e | 1899 | return e_send_ack(w, connection->agreed_pro_version >= 100 ? |
d4dabbe2 | 1900 | P_RETRY_WRITE : P_SUPERSEDED); |
7be8da07 | 1901 | } |
b411b363 | 1902 | |
3e394da1 AG |
1903 | static bool seq_greater(u32 a, u32 b) |
1904 | { | |
1905 | /* | |
1906 | * We assume 32-bit wrap-around here. | |
1907 | * For 24-bit wrap-around, we would have to shift: | |
1908 | * a <<= 8; b <<= 8; | |
1909 | */ | |
1910 | return (s32)a - (s32)b > 0; | |
1911 | } | |
b411b363 | 1912 | |
3e394da1 AG |
1913 | static u32 seq_max(u32 a, u32 b) |
1914 | { | |
1915 | return seq_greater(a, b) ? a : b; | |
b411b363 PR |
1916 | } |
1917 | ||
69a22773 | 1918 | static void update_peer_seq(struct drbd_peer_device *peer_device, unsigned int peer_seq) |
3e394da1 | 1919 | { |
69a22773 | 1920 | struct drbd_device *device = peer_device->device; |
3c13b680 | 1921 | unsigned int newest_peer_seq; |
3e394da1 | 1922 | |
69a22773 | 1923 | if (test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags)) { |
b30ab791 AG |
1924 | spin_lock(&device->peer_seq_lock); |
1925 | newest_peer_seq = seq_max(device->peer_seq, peer_seq); | |
1926 | device->peer_seq = newest_peer_seq; | |
1927 | spin_unlock(&device->peer_seq_lock); | |
1928 | /* wake up only if we actually changed device->peer_seq */ | |
3c13b680 | 1929 | if (peer_seq == newest_peer_seq) |
b30ab791 | 1930 | wake_up(&device->seq_wait); |
7be8da07 | 1931 | } |
b411b363 PR |
1932 | } |
1933 | ||
d93f6302 | 1934 | static inline int overlaps(sector_t s1, int l1, sector_t s2, int l2) |
b6a370ba | 1935 | { |
d93f6302 LE |
1936 | return !((s1 + (l1>>9) <= s2) || (s1 >= s2 + (l2>>9))); |
1937 | } | |
b6a370ba | 1938 | |
d93f6302 | 1939 | /* maybe change sync_ee into interval trees as well? */ |
b30ab791 | 1940 | static bool overlapping_resync_write(struct drbd_device *device, struct drbd_peer_request *peer_req) |
d93f6302 LE |
1941 | { |
1942 | struct drbd_peer_request *rs_req; | |
b6a370ba PR |
1943 | bool rv = 0; |
1944 | ||
0500813f | 1945 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 | 1946 | list_for_each_entry(rs_req, &device->sync_ee, w.list) { |
d93f6302 LE |
1947 | if (overlaps(peer_req->i.sector, peer_req->i.size, |
1948 | rs_req->i.sector, rs_req->i.size)) { | |
b6a370ba PR |
1949 | rv = 1; |
1950 | break; | |
1951 | } | |
1952 | } | |
0500813f | 1953 | spin_unlock_irq(&device->resource->req_lock); |
b6a370ba PR |
1954 | |
1955 | return rv; | |
1956 | } | |
1957 | ||
b411b363 PR |
1958 | /* Called from receive_Data. |
1959 | * Synchronize packets on sock with packets on msock. | |
1960 | * | |
1961 | * This is here so even when a P_DATA packet traveling via sock overtook an Ack | |
1962 | * packet traveling on msock, they are still processed in the order they have | |
1963 | * been sent. | |
1964 | * | |
1965 | * Note: we don't care for Ack packets overtaking P_DATA packets. | |
1966 | * | |
b30ab791 | 1967 | * In case packet_seq is larger than device->peer_seq number, there are |
b411b363 | 1968 | * outstanding packets on the msock. We wait for them to arrive. |
b30ab791 | 1969 | * In case we are the logically next packet, we update device->peer_seq |
b411b363 PR |
1970 | * ourselves. Correctly handles 32bit wrap around. |
1971 | * | |
1972 | * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, | |
1973 | * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds | |
1974 | * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have | |
1975 | * 1<<9 == 512 seconds aka ages for the 32bit wrap around... | |
1976 | * | |
1977 | * returns 0 if we may process the packet, | |
1978 | * -ERESTARTSYS if we were interrupted (by disconnect signal). */ | |
69a22773 | 1979 | static int wait_for_and_update_peer_seq(struct drbd_peer_device *peer_device, const u32 peer_seq) |
b411b363 | 1980 | { |
69a22773 | 1981 | struct drbd_device *device = peer_device->device; |
b411b363 | 1982 | DEFINE_WAIT(wait); |
b411b363 | 1983 | long timeout; |
b874d231 | 1984 | int ret = 0, tp; |
7be8da07 | 1985 | |
69a22773 | 1986 | if (!test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags)) |
7be8da07 AG |
1987 | return 0; |
1988 | ||
b30ab791 | 1989 | spin_lock(&device->peer_seq_lock); |
b411b363 | 1990 | for (;;) { |
b30ab791 AG |
1991 | if (!seq_greater(peer_seq - 1, device->peer_seq)) { |
1992 | device->peer_seq = seq_max(device->peer_seq, peer_seq); | |
b411b363 | 1993 | break; |
7be8da07 | 1994 | } |
b874d231 | 1995 | |
b411b363 PR |
1996 | if (signal_pending(current)) { |
1997 | ret = -ERESTARTSYS; | |
1998 | break; | |
1999 | } | |
b874d231 PR |
2000 | |
2001 | rcu_read_lock(); | |
a6b32bc3 | 2002 | tp = rcu_dereference(first_peer_device(device)->connection->net_conf)->two_primaries; |
b874d231 PR |
2003 | rcu_read_unlock(); |
2004 | ||
2005 | if (!tp) | |
2006 | break; | |
2007 | ||
2008 | /* Only need to wait if two_primaries is enabled */ | |
b30ab791 AG |
2009 | prepare_to_wait(&device->seq_wait, &wait, TASK_INTERRUPTIBLE); |
2010 | spin_unlock(&device->peer_seq_lock); | |
44ed167d | 2011 | rcu_read_lock(); |
69a22773 | 2012 | timeout = rcu_dereference(peer_device->connection->net_conf)->ping_timeo*HZ/10; |
44ed167d | 2013 | rcu_read_unlock(); |
71b1c1eb | 2014 | timeout = schedule_timeout(timeout); |
b30ab791 | 2015 | spin_lock(&device->peer_seq_lock); |
7be8da07 | 2016 | if (!timeout) { |
b411b363 | 2017 | ret = -ETIMEDOUT; |
d0180171 | 2018 | drbd_err(device, "Timed out waiting for missing ack packets; disconnecting\n"); |
b411b363 PR |
2019 | break; |
2020 | } | |
2021 | } | |
b30ab791 AG |
2022 | spin_unlock(&device->peer_seq_lock); |
2023 | finish_wait(&device->seq_wait, &wait); | |
b411b363 PR |
2024 | return ret; |
2025 | } | |
2026 | ||
688593c5 LE |
2027 | /* see also bio_flags_to_wire() |
2028 | * DRBD_REQ_*, because we need to semantically map the flags to data packet | |
2029 | * flags and back. We may replicate to other kernel versions. */ | |
b30ab791 | 2030 | static unsigned long wire_flags_to_bio(struct drbd_device *device, u32 dpf) |
76d2e7ec | 2031 | { |
688593c5 LE |
2032 | return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | |
2033 | (dpf & DP_FUA ? REQ_FUA : 0) | | |
2034 | (dpf & DP_FLUSH ? REQ_FLUSH : 0) | | |
2035 | (dpf & DP_DISCARD ? REQ_DISCARD : 0); | |
76d2e7ec PR |
2036 | } |
2037 | ||
b30ab791 | 2038 | static void fail_postponed_requests(struct drbd_device *device, sector_t sector, |
7be8da07 AG |
2039 | unsigned int size) |
2040 | { | |
2041 | struct drbd_interval *i; | |
2042 | ||
2043 | repeat: | |
b30ab791 | 2044 | drbd_for_each_overlap(i, &device->write_requests, sector, size) { |
7be8da07 AG |
2045 | struct drbd_request *req; |
2046 | struct bio_and_error m; | |
2047 | ||
2048 | if (!i->local) | |
2049 | continue; | |
2050 | req = container_of(i, struct drbd_request, i); | |
2051 | if (!(req->rq_state & RQ_POSTPONED)) | |
2052 | continue; | |
2053 | req->rq_state &= ~RQ_POSTPONED; | |
2054 | __req_mod(req, NEG_ACKED, &m); | |
0500813f | 2055 | spin_unlock_irq(&device->resource->req_lock); |
7be8da07 | 2056 | if (m.bio) |
b30ab791 | 2057 | complete_master_bio(device, &m); |
0500813f | 2058 | spin_lock_irq(&device->resource->req_lock); |
7be8da07 AG |
2059 | goto repeat; |
2060 | } | |
2061 | } | |
2062 | ||
b30ab791 | 2063 | static int handle_write_conflicts(struct drbd_device *device, |
7be8da07 AG |
2064 | struct drbd_peer_request *peer_req) |
2065 | { | |
a6b32bc3 | 2066 | struct drbd_connection *connection = first_peer_device(device)->connection; |
bde89a9e | 2067 | bool resolve_conflicts = test_bit(RESOLVE_CONFLICTS, &connection->flags); |
7be8da07 AG |
2068 | sector_t sector = peer_req->i.sector; |
2069 | const unsigned int size = peer_req->i.size; | |
2070 | struct drbd_interval *i; | |
2071 | bool equal; | |
2072 | int err; | |
2073 | ||
2074 | /* | |
2075 | * Inserting the peer request into the write_requests tree will prevent | |
2076 | * new conflicting local requests from being added. | |
2077 | */ | |
b30ab791 | 2078 | drbd_insert_interval(&device->write_requests, &peer_req->i); |
7be8da07 AG |
2079 | |
2080 | repeat: | |
b30ab791 | 2081 | drbd_for_each_overlap(i, &device->write_requests, sector, size) { |
7be8da07 AG |
2082 | if (i == &peer_req->i) |
2083 | continue; | |
2084 | ||
2085 | if (!i->local) { | |
2086 | /* | |
2087 | * Our peer has sent a conflicting remote request; this | |
2088 | * should not happen in a two-node setup. Wait for the | |
2089 | * earlier peer request to complete. | |
2090 | */ | |
b30ab791 | 2091 | err = drbd_wait_misc(device, i); |
7be8da07 AG |
2092 | if (err) |
2093 | goto out; | |
2094 | goto repeat; | |
2095 | } | |
2096 | ||
2097 | equal = i->sector == sector && i->size == size; | |
2098 | if (resolve_conflicts) { | |
2099 | /* | |
2100 | * If the peer request is fully contained within the | |
d4dabbe2 LE |
2101 | * overlapping request, it can be considered overwritten |
2102 | * and thus superseded; otherwise, it will be retried | |
2103 | * once all overlapping requests have completed. | |
7be8da07 | 2104 | */ |
d4dabbe2 | 2105 | bool superseded = i->sector <= sector && i->sector + |
7be8da07 AG |
2106 | (i->size >> 9) >= sector + (size >> 9); |
2107 | ||
2108 | if (!equal) | |
d0180171 | 2109 | drbd_alert(device, "Concurrent writes detected: " |
7be8da07 AG |
2110 | "local=%llus +%u, remote=%llus +%u, " |
2111 | "assuming %s came first\n", | |
2112 | (unsigned long long)i->sector, i->size, | |
2113 | (unsigned long long)sector, size, | |
d4dabbe2 | 2114 | superseded ? "local" : "remote"); |
7be8da07 | 2115 | |
b30ab791 | 2116 | inc_unacked(device); |
d4dabbe2 | 2117 | peer_req->w.cb = superseded ? e_send_superseded : |
7be8da07 | 2118 | e_send_retry_write; |
b30ab791 | 2119 | list_add_tail(&peer_req->w.list, &device->done_ee); |
a6b32bc3 | 2120 | wake_asender(first_peer_device(device)->connection); |
7be8da07 AG |
2121 | |
2122 | err = -ENOENT; | |
2123 | goto out; | |
2124 | } else { | |
2125 | struct drbd_request *req = | |
2126 | container_of(i, struct drbd_request, i); | |
2127 | ||
2128 | if (!equal) | |
d0180171 | 2129 | drbd_alert(device, "Concurrent writes detected: " |
7be8da07 AG |
2130 | "local=%llus +%u, remote=%llus +%u\n", |
2131 | (unsigned long long)i->sector, i->size, | |
2132 | (unsigned long long)sector, size); | |
2133 | ||
2134 | if (req->rq_state & RQ_LOCAL_PENDING || | |
2135 | !(req->rq_state & RQ_POSTPONED)) { | |
2136 | /* | |
2137 | * Wait for the node with the discard flag to | |
d4dabbe2 LE |
2138 | * decide if this request has been superseded |
2139 | * or needs to be retried. | |
2140 | * Requests that have been superseded will | |
7be8da07 AG |
2141 | * disappear from the write_requests tree. |
2142 | * | |
2143 | * In addition, wait for the conflicting | |
2144 | * request to finish locally before submitting | |
2145 | * the conflicting peer request. | |
2146 | */ | |
b30ab791 | 2147 | err = drbd_wait_misc(device, &req->i); |
7be8da07 | 2148 | if (err) { |
a6b32bc3 | 2149 | _conn_request_state(first_peer_device(device)->connection, |
7be8da07 AG |
2150 | NS(conn, C_TIMEOUT), |
2151 | CS_HARD); | |
b30ab791 | 2152 | fail_postponed_requests(device, sector, size); |
7be8da07 AG |
2153 | goto out; |
2154 | } | |
2155 | goto repeat; | |
2156 | } | |
2157 | /* | |
2158 | * Remember to restart the conflicting requests after | |
2159 | * the new peer request has completed. | |
2160 | */ | |
2161 | peer_req->flags |= EE_RESTART_REQUESTS; | |
2162 | } | |
2163 | } | |
2164 | err = 0; | |
2165 | ||
2166 | out: | |
2167 | if (err) | |
b30ab791 | 2168 | drbd_remove_epoch_entry_interval(device, peer_req); |
7be8da07 AG |
2169 | return err; |
2170 | } | |
2171 | ||
b411b363 | 2172 | /* mirrored write */ |
bde89a9e | 2173 | static int receive_Data(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 2174 | { |
9f4fe9ad | 2175 | struct drbd_peer_device *peer_device; |
b30ab791 | 2176 | struct drbd_device *device; |
b411b363 | 2177 | sector_t sector; |
db830c46 | 2178 | struct drbd_peer_request *peer_req; |
e658983a | 2179 | struct p_data *p = pi->data; |
7be8da07 | 2180 | u32 peer_seq = be32_to_cpu(p->seq_num); |
b411b363 PR |
2181 | int rw = WRITE; |
2182 | u32 dp_flags; | |
302bdeae | 2183 | int err, tp; |
b411b363 | 2184 | |
9f4fe9ad AG |
2185 | peer_device = conn_peer_device(connection, pi->vnr); |
2186 | if (!peer_device) | |
4a76b161 | 2187 | return -EIO; |
9f4fe9ad | 2188 | device = peer_device->device; |
b411b363 | 2189 | |
b30ab791 | 2190 | if (!get_ldev(device)) { |
82bc0194 AG |
2191 | int err2; |
2192 | ||
69a22773 AG |
2193 | err = wait_for_and_update_peer_seq(peer_device, peer_seq); |
2194 | drbd_send_ack_dp(peer_device, P_NEG_ACK, p, pi->size); | |
bde89a9e | 2195 | atomic_inc(&connection->current_epoch->epoch_size); |
69a22773 | 2196 | err2 = drbd_drain_block(peer_device, pi->size); |
82bc0194 AG |
2197 | if (!err) |
2198 | err = err2; | |
2199 | return err; | |
b411b363 PR |
2200 | } |
2201 | ||
fcefa62e AG |
2202 | /* |
2203 | * Corresponding put_ldev done either below (on various errors), or in | |
2204 | * drbd_peer_request_endio, if we successfully submit the data at the | |
2205 | * end of this function. | |
2206 | */ | |
b411b363 PR |
2207 | |
2208 | sector = be64_to_cpu(p->sector); | |
69a22773 | 2209 | peer_req = read_in_block(peer_device, p->block_id, sector, pi->size); |
db830c46 | 2210 | if (!peer_req) { |
b30ab791 | 2211 | put_ldev(device); |
82bc0194 | 2212 | return -EIO; |
b411b363 PR |
2213 | } |
2214 | ||
db830c46 | 2215 | peer_req->w.cb = e_end_block; |
b411b363 | 2216 | |
688593c5 | 2217 | dp_flags = be32_to_cpu(p->dp_flags); |
b30ab791 | 2218 | rw |= wire_flags_to_bio(device, dp_flags); |
81a3537a | 2219 | if (peer_req->pages == NULL) { |
0b0ba1ef AG |
2220 | D_ASSERT(device, peer_req->i.size == 0); |
2221 | D_ASSERT(device, dp_flags & DP_FLUSH); | |
a73ff323 | 2222 | } |
688593c5 LE |
2223 | |
2224 | if (dp_flags & DP_MAY_SET_IN_SYNC) | |
db830c46 | 2225 | peer_req->flags |= EE_MAY_SET_IN_SYNC; |
688593c5 | 2226 | |
bde89a9e AG |
2227 | spin_lock(&connection->epoch_lock); |
2228 | peer_req->epoch = connection->current_epoch; | |
db830c46 AG |
2229 | atomic_inc(&peer_req->epoch->epoch_size); |
2230 | atomic_inc(&peer_req->epoch->active); | |
bde89a9e | 2231 | spin_unlock(&connection->epoch_lock); |
b411b363 | 2232 | |
302bdeae | 2233 | rcu_read_lock(); |
9f4fe9ad | 2234 | tp = rcu_dereference(peer_device->connection->net_conf)->two_primaries; |
302bdeae PR |
2235 | rcu_read_unlock(); |
2236 | if (tp) { | |
2237 | peer_req->flags |= EE_IN_INTERVAL_TREE; | |
69a22773 | 2238 | err = wait_for_and_update_peer_seq(peer_device, peer_seq); |
7be8da07 | 2239 | if (err) |
b411b363 | 2240 | goto out_interrupted; |
0500813f | 2241 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 | 2242 | err = handle_write_conflicts(device, peer_req); |
7be8da07 | 2243 | if (err) { |
0500813f | 2244 | spin_unlock_irq(&device->resource->req_lock); |
7be8da07 | 2245 | if (err == -ENOENT) { |
b30ab791 | 2246 | put_ldev(device); |
82bc0194 | 2247 | return 0; |
b411b363 | 2248 | } |
7be8da07 | 2249 | goto out_interrupted; |
b411b363 | 2250 | } |
b874d231 | 2251 | } else { |
69a22773 | 2252 | update_peer_seq(peer_device, peer_seq); |
0500813f | 2253 | spin_lock_irq(&device->resource->req_lock); |
b874d231 | 2254 | } |
b30ab791 | 2255 | list_add(&peer_req->w.list, &device->active_ee); |
0500813f | 2256 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 | 2257 | |
b30ab791 AG |
2258 | if (device->state.conn == C_SYNC_TARGET) |
2259 | wait_event(device->ee_wait, !overlapping_resync_write(device, peer_req)); | |
b411b363 | 2260 | |
9f4fe9ad | 2261 | if (peer_device->connection->agreed_pro_version < 100) { |
44ed167d | 2262 | rcu_read_lock(); |
9f4fe9ad | 2263 | switch (rcu_dereference(peer_device->connection->net_conf)->wire_protocol) { |
303d1448 PR |
2264 | case DRBD_PROT_C: |
2265 | dp_flags |= DP_SEND_WRITE_ACK; | |
2266 | break; | |
2267 | case DRBD_PROT_B: | |
2268 | dp_flags |= DP_SEND_RECEIVE_ACK; | |
2269 | break; | |
b411b363 | 2270 | } |
44ed167d | 2271 | rcu_read_unlock(); |
b411b363 PR |
2272 | } |
2273 | ||
303d1448 PR |
2274 | if (dp_flags & DP_SEND_WRITE_ACK) { |
2275 | peer_req->flags |= EE_SEND_WRITE_ACK; | |
b30ab791 | 2276 | inc_unacked(device); |
b411b363 PR |
2277 | /* corresponding dec_unacked() in e_end_block() |
2278 | * respective _drbd_clear_done_ee */ | |
303d1448 PR |
2279 | } |
2280 | ||
2281 | if (dp_flags & DP_SEND_RECEIVE_ACK) { | |
b411b363 PR |
2282 | /* I really don't like it that the receiver thread |
2283 | * sends on the msock, but anyways */ | |
69a22773 | 2284 | drbd_send_ack(first_peer_device(device), P_RECV_ACK, peer_req); |
b411b363 PR |
2285 | } |
2286 | ||
b30ab791 | 2287 | if (device->state.pdsk < D_INCONSISTENT) { |
b411b363 | 2288 | /* In case we have the only disk of the cluster, */ |
b30ab791 | 2289 | drbd_set_out_of_sync(device, peer_req->i.sector, peer_req->i.size); |
db830c46 AG |
2290 | peer_req->flags |= EE_CALL_AL_COMPLETE_IO; |
2291 | peer_req->flags &= ~EE_MAY_SET_IN_SYNC; | |
b30ab791 | 2292 | drbd_al_begin_io(device, &peer_req->i, true); |
b411b363 PR |
2293 | } |
2294 | ||
b30ab791 | 2295 | err = drbd_submit_peer_request(device, peer_req, rw, DRBD_FAULT_DT_WR); |
82bc0194 AG |
2296 | if (!err) |
2297 | return 0; | |
b411b363 | 2298 | |
10f6d992 | 2299 | /* don't care for the reason here */ |
d0180171 | 2300 | drbd_err(device, "submit failed, triggering re-connect\n"); |
0500813f | 2301 | spin_lock_irq(&device->resource->req_lock); |
db830c46 | 2302 | list_del(&peer_req->w.list); |
b30ab791 | 2303 | drbd_remove_epoch_entry_interval(device, peer_req); |
0500813f | 2304 | spin_unlock_irq(&device->resource->req_lock); |
db830c46 | 2305 | if (peer_req->flags & EE_CALL_AL_COMPLETE_IO) |
b30ab791 | 2306 | drbd_al_complete_io(device, &peer_req->i); |
22cc37a9 | 2307 | |
b411b363 | 2308 | out_interrupted: |
bde89a9e | 2309 | drbd_may_finish_epoch(connection, peer_req->epoch, EV_PUT + EV_CLEANUP); |
b30ab791 AG |
2310 | put_ldev(device); |
2311 | drbd_free_peer_req(device, peer_req); | |
82bc0194 | 2312 | return err; |
b411b363 PR |
2313 | } |
2314 | ||
0f0601f4 LE |
2315 | /* We may throttle resync, if the lower device seems to be busy, |
2316 | * and current sync rate is above c_min_rate. | |
2317 | * | |
2318 | * To decide whether or not the lower device is busy, we use a scheme similar | |
2319 | * to MD RAID is_mddev_idle(): if the partition stats reveal "significant" | |
2320 | * (more than 64 sectors) of activity we cannot account for with our own resync | |
2321 | * activity, it obviously is "busy". | |
2322 | * | |
2323 | * The current sync rate used here uses only the most recent two step marks, | |
2324 | * to have a short time average so we can react faster. | |
2325 | */ | |
b30ab791 | 2326 | int drbd_rs_should_slow_down(struct drbd_device *device, sector_t sector) |
0f0601f4 | 2327 | { |
b30ab791 | 2328 | struct gendisk *disk = device->ldev->backing_bdev->bd_contains->bd_disk; |
0f0601f4 | 2329 | unsigned long db, dt, dbdt; |
e3555d85 | 2330 | struct lc_element *tmp; |
0f0601f4 LE |
2331 | int curr_events; |
2332 | int throttle = 0; | |
daeda1cc PR |
2333 | unsigned int c_min_rate; |
2334 | ||
2335 | rcu_read_lock(); | |
b30ab791 | 2336 | c_min_rate = rcu_dereference(device->ldev->disk_conf)->c_min_rate; |
daeda1cc | 2337 | rcu_read_unlock(); |
0f0601f4 LE |
2338 | |
2339 | /* feature disabled? */ | |
daeda1cc | 2340 | if (c_min_rate == 0) |
0f0601f4 LE |
2341 | return 0; |
2342 | ||
b30ab791 AG |
2343 | spin_lock_irq(&device->al_lock); |
2344 | tmp = lc_find(device->resync, BM_SECT_TO_EXT(sector)); | |
e3555d85 PR |
2345 | if (tmp) { |
2346 | struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); | |
2347 | if (test_bit(BME_PRIORITY, &bm_ext->flags)) { | |
b30ab791 | 2348 | spin_unlock_irq(&device->al_lock); |
e3555d85 PR |
2349 | return 0; |
2350 | } | |
2351 | /* Do not slow down if app IO is already waiting for this extent */ | |
2352 | } | |
b30ab791 | 2353 | spin_unlock_irq(&device->al_lock); |
e3555d85 | 2354 | |
0f0601f4 LE |
2355 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
2356 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
b30ab791 | 2357 | atomic_read(&device->rs_sect_ev); |
e3555d85 | 2358 | |
b30ab791 | 2359 | if (!device->rs_last_events || curr_events - device->rs_last_events > 64) { |
0f0601f4 LE |
2360 | unsigned long rs_left; |
2361 | int i; | |
2362 | ||
b30ab791 | 2363 | device->rs_last_events = curr_events; |
0f0601f4 LE |
2364 | |
2365 | /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, | |
2366 | * approx. */ | |
b30ab791 | 2367 | i = (device->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; |
2649f080 | 2368 | |
b30ab791 AG |
2369 | if (device->state.conn == C_VERIFY_S || device->state.conn == C_VERIFY_T) |
2370 | rs_left = device->ov_left; | |
2649f080 | 2371 | else |
b30ab791 | 2372 | rs_left = drbd_bm_total_weight(device) - device->rs_failed; |
0f0601f4 | 2373 | |
b30ab791 | 2374 | dt = ((long)jiffies - (long)device->rs_mark_time[i]) / HZ; |
0f0601f4 LE |
2375 | if (!dt) |
2376 | dt++; | |
b30ab791 | 2377 | db = device->rs_mark_left[i] - rs_left; |
0f0601f4 LE |
2378 | dbdt = Bit2KB(db/dt); |
2379 | ||
daeda1cc | 2380 | if (dbdt > c_min_rate) |
0f0601f4 LE |
2381 | throttle = 1; |
2382 | } | |
2383 | return throttle; | |
2384 | } | |
2385 | ||
2386 | ||
bde89a9e | 2387 | static int receive_DataRequest(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 2388 | { |
9f4fe9ad | 2389 | struct drbd_peer_device *peer_device; |
b30ab791 | 2390 | struct drbd_device *device; |
b411b363 | 2391 | sector_t sector; |
4a76b161 | 2392 | sector_t capacity; |
db830c46 | 2393 | struct drbd_peer_request *peer_req; |
b411b363 | 2394 | struct digest_info *di = NULL; |
b18b37be | 2395 | int size, verb; |
b411b363 | 2396 | unsigned int fault_type; |
e658983a | 2397 | struct p_block_req *p = pi->data; |
4a76b161 | 2398 | |
9f4fe9ad AG |
2399 | peer_device = conn_peer_device(connection, pi->vnr); |
2400 | if (!peer_device) | |
4a76b161 | 2401 | return -EIO; |
9f4fe9ad | 2402 | device = peer_device->device; |
b30ab791 | 2403 | capacity = drbd_get_capacity(device->this_bdev); |
b411b363 PR |
2404 | |
2405 | sector = be64_to_cpu(p->sector); | |
2406 | size = be32_to_cpu(p->blksize); | |
2407 | ||
c670a398 | 2408 | if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) { |
d0180171 | 2409 | drbd_err(device, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, |
b411b363 | 2410 | (unsigned long long)sector, size); |
82bc0194 | 2411 | return -EINVAL; |
b411b363 PR |
2412 | } |
2413 | if (sector + (size>>9) > capacity) { | |
d0180171 | 2414 | drbd_err(device, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, |
b411b363 | 2415 | (unsigned long long)sector, size); |
82bc0194 | 2416 | return -EINVAL; |
b411b363 PR |
2417 | } |
2418 | ||
b30ab791 | 2419 | if (!get_ldev_if_state(device, D_UP_TO_DATE)) { |
b18b37be | 2420 | verb = 1; |
e2857216 | 2421 | switch (pi->cmd) { |
b18b37be | 2422 | case P_DATA_REQUEST: |
69a22773 | 2423 | drbd_send_ack_rp(peer_device, P_NEG_DREPLY, p); |
b18b37be PR |
2424 | break; |
2425 | case P_RS_DATA_REQUEST: | |
2426 | case P_CSUM_RS_REQUEST: | |
2427 | case P_OV_REQUEST: | |
69a22773 | 2428 | drbd_send_ack_rp(peer_device, P_NEG_RS_DREPLY , p); |
b18b37be PR |
2429 | break; |
2430 | case P_OV_REPLY: | |
2431 | verb = 0; | |
b30ab791 | 2432 | dec_rs_pending(device); |
69a22773 | 2433 | drbd_send_ack_ex(peer_device, P_OV_RESULT, sector, size, ID_IN_SYNC); |
b18b37be PR |
2434 | break; |
2435 | default: | |
49ba9b1b | 2436 | BUG(); |
b18b37be PR |
2437 | } |
2438 | if (verb && __ratelimit(&drbd_ratelimit_state)) | |
d0180171 | 2439 | drbd_err(device, "Can not satisfy peer's read request, " |
b411b363 | 2440 | "no local data.\n"); |
b18b37be | 2441 | |
a821cc4a | 2442 | /* drain possibly payload */ |
69a22773 | 2443 | return drbd_drain_block(peer_device, pi->size); |
b411b363 PR |
2444 | } |
2445 | ||
2446 | /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD | |
2447 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
2448 | * which in turn might block on the other node at this very place. */ | |
69a22773 | 2449 | peer_req = drbd_alloc_peer_req(peer_device, p->block_id, sector, size, GFP_NOIO); |
db830c46 | 2450 | if (!peer_req) { |
b30ab791 | 2451 | put_ldev(device); |
82bc0194 | 2452 | return -ENOMEM; |
b411b363 PR |
2453 | } |
2454 | ||
e2857216 | 2455 | switch (pi->cmd) { |
b411b363 | 2456 | case P_DATA_REQUEST: |
db830c46 | 2457 | peer_req->w.cb = w_e_end_data_req; |
b411b363 | 2458 | fault_type = DRBD_FAULT_DT_RD; |
80a40e43 LE |
2459 | /* application IO, don't drbd_rs_begin_io */ |
2460 | goto submit; | |
2461 | ||
b411b363 | 2462 | case P_RS_DATA_REQUEST: |
db830c46 | 2463 | peer_req->w.cb = w_e_end_rsdata_req; |
b411b363 | 2464 | fault_type = DRBD_FAULT_RS_RD; |
5f9915bb | 2465 | /* used in the sector offset progress display */ |
b30ab791 | 2466 | device->bm_resync_fo = BM_SECT_TO_BIT(sector); |
b411b363 PR |
2467 | break; |
2468 | ||
2469 | case P_OV_REPLY: | |
2470 | case P_CSUM_RS_REQUEST: | |
2471 | fault_type = DRBD_FAULT_RS_RD; | |
e2857216 | 2472 | di = kmalloc(sizeof(*di) + pi->size, GFP_NOIO); |
b411b363 PR |
2473 | if (!di) |
2474 | goto out_free_e; | |
2475 | ||
e2857216 | 2476 | di->digest_size = pi->size; |
b411b363 PR |
2477 | di->digest = (((char *)di)+sizeof(struct digest_info)); |
2478 | ||
db830c46 AG |
2479 | peer_req->digest = di; |
2480 | peer_req->flags |= EE_HAS_DIGEST; | |
c36c3ced | 2481 | |
9f4fe9ad | 2482 | if (drbd_recv_all(peer_device->connection, di->digest, pi->size)) |
b411b363 PR |
2483 | goto out_free_e; |
2484 | ||
e2857216 | 2485 | if (pi->cmd == P_CSUM_RS_REQUEST) { |
9f4fe9ad | 2486 | D_ASSERT(device, peer_device->connection->agreed_pro_version >= 89); |
db830c46 | 2487 | peer_req->w.cb = w_e_end_csum_rs_req; |
5f9915bb | 2488 | /* used in the sector offset progress display */ |
b30ab791 | 2489 | device->bm_resync_fo = BM_SECT_TO_BIT(sector); |
e2857216 | 2490 | } else if (pi->cmd == P_OV_REPLY) { |
2649f080 | 2491 | /* track progress, we may need to throttle */ |
b30ab791 | 2492 | atomic_add(size >> 9, &device->rs_sect_in); |
db830c46 | 2493 | peer_req->w.cb = w_e_end_ov_reply; |
b30ab791 | 2494 | dec_rs_pending(device); |
0f0601f4 LE |
2495 | /* drbd_rs_begin_io done when we sent this request, |
2496 | * but accounting still needs to be done. */ | |
2497 | goto submit_for_resync; | |
b411b363 PR |
2498 | } |
2499 | break; | |
2500 | ||
2501 | case P_OV_REQUEST: | |
b30ab791 | 2502 | if (device->ov_start_sector == ~(sector_t)0 && |
9f4fe9ad | 2503 | peer_device->connection->agreed_pro_version >= 90) { |
de228bba LE |
2504 | unsigned long now = jiffies; |
2505 | int i; | |
b30ab791 AG |
2506 | device->ov_start_sector = sector; |
2507 | device->ov_position = sector; | |
2508 | device->ov_left = drbd_bm_bits(device) - BM_SECT_TO_BIT(sector); | |
2509 | device->rs_total = device->ov_left; | |
de228bba | 2510 | for (i = 0; i < DRBD_SYNC_MARKS; i++) { |
b30ab791 AG |
2511 | device->rs_mark_left[i] = device->ov_left; |
2512 | device->rs_mark_time[i] = now; | |
de228bba | 2513 | } |
d0180171 | 2514 | drbd_info(device, "Online Verify start sector: %llu\n", |
b411b363 PR |
2515 | (unsigned long long)sector); |
2516 | } | |
db830c46 | 2517 | peer_req->w.cb = w_e_end_ov_req; |
b411b363 | 2518 | fault_type = DRBD_FAULT_RS_RD; |
b411b363 PR |
2519 | break; |
2520 | ||
b411b363 | 2521 | default: |
49ba9b1b | 2522 | BUG(); |
b411b363 PR |
2523 | } |
2524 | ||
0f0601f4 LE |
2525 | /* Throttle, drbd_rs_begin_io and submit should become asynchronous |
2526 | * wrt the receiver, but it is not as straightforward as it may seem. | |
2527 | * Various places in the resync start and stop logic assume resync | |
2528 | * requests are processed in order, requeuing this on the worker thread | |
2529 | * introduces a bunch of new code for synchronization between threads. | |
2530 | * | |
2531 | * Unlimited throttling before drbd_rs_begin_io may stall the resync | |
2532 | * "forever", throttling after drbd_rs_begin_io will lock that extent | |
2533 | * for application writes for the same time. For now, just throttle | |
2534 | * here, where the rest of the code expects the receiver to sleep for | |
2535 | * a while, anyways. | |
2536 | */ | |
2537 | ||
2538 | /* Throttle before drbd_rs_begin_io, as that locks out application IO; | |
2539 | * this defers syncer requests for some time, before letting at least | |
2540 | * on request through. The resync controller on the receiving side | |
2541 | * will adapt to the incoming rate accordingly. | |
2542 | * | |
2543 | * We cannot throttle here if remote is Primary/SyncTarget: | |
2544 | * we would also throttle its application reads. | |
2545 | * In that case, throttling is done on the SyncTarget only. | |
2546 | */ | |
b30ab791 | 2547 | if (device->state.peer != R_PRIMARY && drbd_rs_should_slow_down(device, sector)) |
e3555d85 | 2548 | schedule_timeout_uninterruptible(HZ/10); |
b30ab791 | 2549 | if (drbd_rs_begin_io(device, sector)) |
80a40e43 | 2550 | goto out_free_e; |
b411b363 | 2551 | |
0f0601f4 | 2552 | submit_for_resync: |
b30ab791 | 2553 | atomic_add(size >> 9, &device->rs_sect_ev); |
0f0601f4 | 2554 | |
80a40e43 | 2555 | submit: |
b30ab791 | 2556 | inc_unacked(device); |
0500813f | 2557 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 | 2558 | list_add_tail(&peer_req->w.list, &device->read_ee); |
0500813f | 2559 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 | 2560 | |
b30ab791 | 2561 | if (drbd_submit_peer_request(device, peer_req, READ, fault_type) == 0) |
82bc0194 | 2562 | return 0; |
b411b363 | 2563 | |
10f6d992 | 2564 | /* don't care for the reason here */ |
d0180171 | 2565 | drbd_err(device, "submit failed, triggering re-connect\n"); |
0500813f | 2566 | spin_lock_irq(&device->resource->req_lock); |
db830c46 | 2567 | list_del(&peer_req->w.list); |
0500813f | 2568 | spin_unlock_irq(&device->resource->req_lock); |
22cc37a9 LE |
2569 | /* no drbd_rs_complete_io(), we are dropping the connection anyways */ |
2570 | ||
b411b363 | 2571 | out_free_e: |
b30ab791 AG |
2572 | put_ldev(device); |
2573 | drbd_free_peer_req(device, peer_req); | |
82bc0194 | 2574 | return -EIO; |
b411b363 PR |
2575 | } |
2576 | ||
69a22773 AG |
2577 | /** |
2578 | * drbd_asb_recover_0p - Recover after split-brain with no remaining primaries | |
2579 | */ | |
2580 | static int drbd_asb_recover_0p(struct drbd_peer_device *peer_device) __must_hold(local) | |
b411b363 | 2581 | { |
69a22773 | 2582 | struct drbd_device *device = peer_device->device; |
b411b363 PR |
2583 | int self, peer, rv = -100; |
2584 | unsigned long ch_self, ch_peer; | |
44ed167d | 2585 | enum drbd_after_sb_p after_sb_0p; |
b411b363 | 2586 | |
b30ab791 AG |
2587 | self = device->ldev->md.uuid[UI_BITMAP] & 1; |
2588 | peer = device->p_uuid[UI_BITMAP] & 1; | |
b411b363 | 2589 | |
b30ab791 AG |
2590 | ch_peer = device->p_uuid[UI_SIZE]; |
2591 | ch_self = device->comm_bm_set; | |
b411b363 | 2592 | |
44ed167d | 2593 | rcu_read_lock(); |
69a22773 | 2594 | after_sb_0p = rcu_dereference(peer_device->connection->net_conf)->after_sb_0p; |
44ed167d PR |
2595 | rcu_read_unlock(); |
2596 | switch (after_sb_0p) { | |
b411b363 PR |
2597 | case ASB_CONSENSUS: |
2598 | case ASB_DISCARD_SECONDARY: | |
2599 | case ASB_CALL_HELPER: | |
44ed167d | 2600 | case ASB_VIOLENTLY: |
d0180171 | 2601 | drbd_err(device, "Configuration error.\n"); |
b411b363 PR |
2602 | break; |
2603 | case ASB_DISCONNECT: | |
2604 | break; | |
2605 | case ASB_DISCARD_YOUNGER_PRI: | |
2606 | if (self == 0 && peer == 1) { | |
2607 | rv = -1; | |
2608 | break; | |
2609 | } | |
2610 | if (self == 1 && peer == 0) { | |
2611 | rv = 1; | |
2612 | break; | |
2613 | } | |
2614 | /* Else fall through to one of the other strategies... */ | |
2615 | case ASB_DISCARD_OLDER_PRI: | |
2616 | if (self == 0 && peer == 1) { | |
2617 | rv = 1; | |
2618 | break; | |
2619 | } | |
2620 | if (self == 1 && peer == 0) { | |
2621 | rv = -1; | |
2622 | break; | |
2623 | } | |
2624 | /* Else fall through to one of the other strategies... */ | |
d0180171 | 2625 | drbd_warn(device, "Discard younger/older primary did not find a decision\n" |
b411b363 PR |
2626 | "Using discard-least-changes instead\n"); |
2627 | case ASB_DISCARD_ZERO_CHG: | |
2628 | if (ch_peer == 0 && ch_self == 0) { | |
69a22773 | 2629 | rv = test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags) |
b411b363 PR |
2630 | ? -1 : 1; |
2631 | break; | |
2632 | } else { | |
2633 | if (ch_peer == 0) { rv = 1; break; } | |
2634 | if (ch_self == 0) { rv = -1; break; } | |
2635 | } | |
44ed167d | 2636 | if (after_sb_0p == ASB_DISCARD_ZERO_CHG) |
b411b363 PR |
2637 | break; |
2638 | case ASB_DISCARD_LEAST_CHG: | |
2639 | if (ch_self < ch_peer) | |
2640 | rv = -1; | |
2641 | else if (ch_self > ch_peer) | |
2642 | rv = 1; | |
2643 | else /* ( ch_self == ch_peer ) */ | |
2644 | /* Well, then use something else. */ | |
69a22773 | 2645 | rv = test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags) |
b411b363 PR |
2646 | ? -1 : 1; |
2647 | break; | |
2648 | case ASB_DISCARD_LOCAL: | |
2649 | rv = -1; | |
2650 | break; | |
2651 | case ASB_DISCARD_REMOTE: | |
2652 | rv = 1; | |
2653 | } | |
2654 | ||
2655 | return rv; | |
2656 | } | |
2657 | ||
69a22773 AG |
2658 | /** |
2659 | * drbd_asb_recover_1p - Recover after split-brain with one remaining primary | |
2660 | */ | |
2661 | static int drbd_asb_recover_1p(struct drbd_peer_device *peer_device) __must_hold(local) | |
b411b363 | 2662 | { |
69a22773 | 2663 | struct drbd_device *device = peer_device->device; |
6184ea21 | 2664 | int hg, rv = -100; |
44ed167d | 2665 | enum drbd_after_sb_p after_sb_1p; |
b411b363 | 2666 | |
44ed167d | 2667 | rcu_read_lock(); |
69a22773 | 2668 | after_sb_1p = rcu_dereference(peer_device->connection->net_conf)->after_sb_1p; |
44ed167d PR |
2669 | rcu_read_unlock(); |
2670 | switch (after_sb_1p) { | |
b411b363 PR |
2671 | case ASB_DISCARD_YOUNGER_PRI: |
2672 | case ASB_DISCARD_OLDER_PRI: | |
2673 | case ASB_DISCARD_LEAST_CHG: | |
2674 | case ASB_DISCARD_LOCAL: | |
2675 | case ASB_DISCARD_REMOTE: | |
44ed167d | 2676 | case ASB_DISCARD_ZERO_CHG: |
d0180171 | 2677 | drbd_err(device, "Configuration error.\n"); |
b411b363 PR |
2678 | break; |
2679 | case ASB_DISCONNECT: | |
2680 | break; | |
2681 | case ASB_CONSENSUS: | |
69a22773 | 2682 | hg = drbd_asb_recover_0p(peer_device); |
b30ab791 | 2683 | if (hg == -1 && device->state.role == R_SECONDARY) |
b411b363 | 2684 | rv = hg; |
b30ab791 | 2685 | if (hg == 1 && device->state.role == R_PRIMARY) |
b411b363 PR |
2686 | rv = hg; |
2687 | break; | |
2688 | case ASB_VIOLENTLY: | |
69a22773 | 2689 | rv = drbd_asb_recover_0p(peer_device); |
b411b363 PR |
2690 | break; |
2691 | case ASB_DISCARD_SECONDARY: | |
b30ab791 | 2692 | return device->state.role == R_PRIMARY ? 1 : -1; |
b411b363 | 2693 | case ASB_CALL_HELPER: |
69a22773 | 2694 | hg = drbd_asb_recover_0p(peer_device); |
b30ab791 | 2695 | if (hg == -1 && device->state.role == R_PRIMARY) { |
bb437946 AG |
2696 | enum drbd_state_rv rv2; |
2697 | ||
b411b363 PR |
2698 | /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, |
2699 | * we might be here in C_WF_REPORT_PARAMS which is transient. | |
2700 | * we do not need to wait for the after state change work either. */ | |
b30ab791 | 2701 | rv2 = drbd_change_state(device, CS_VERBOSE, NS(role, R_SECONDARY)); |
bb437946 | 2702 | if (rv2 != SS_SUCCESS) { |
b30ab791 | 2703 | drbd_khelper(device, "pri-lost-after-sb"); |
b411b363 | 2704 | } else { |
d0180171 | 2705 | drbd_warn(device, "Successfully gave up primary role.\n"); |
b411b363 PR |
2706 | rv = hg; |
2707 | } | |
2708 | } else | |
2709 | rv = hg; | |
2710 | } | |
2711 | ||
2712 | return rv; | |
2713 | } | |
2714 | ||
69a22773 AG |
2715 | /** |
2716 | * drbd_asb_recover_2p - Recover after split-brain with two remaining primaries | |
2717 | */ | |
2718 | static int drbd_asb_recover_2p(struct drbd_peer_device *peer_device) __must_hold(local) | |
b411b363 | 2719 | { |
69a22773 | 2720 | struct drbd_device *device = peer_device->device; |
6184ea21 | 2721 | int hg, rv = -100; |
44ed167d | 2722 | enum drbd_after_sb_p after_sb_2p; |
b411b363 | 2723 | |
44ed167d | 2724 | rcu_read_lock(); |
69a22773 | 2725 | after_sb_2p = rcu_dereference(peer_device->connection->net_conf)->after_sb_2p; |
44ed167d PR |
2726 | rcu_read_unlock(); |
2727 | switch (after_sb_2p) { | |
b411b363 PR |
2728 | case ASB_DISCARD_YOUNGER_PRI: |
2729 | case ASB_DISCARD_OLDER_PRI: | |
2730 | case ASB_DISCARD_LEAST_CHG: | |
2731 | case ASB_DISCARD_LOCAL: | |
2732 | case ASB_DISCARD_REMOTE: | |
2733 | case ASB_CONSENSUS: | |
2734 | case ASB_DISCARD_SECONDARY: | |
44ed167d | 2735 | case ASB_DISCARD_ZERO_CHG: |
d0180171 | 2736 | drbd_err(device, "Configuration error.\n"); |
b411b363 PR |
2737 | break; |
2738 | case ASB_VIOLENTLY: | |
69a22773 | 2739 | rv = drbd_asb_recover_0p(peer_device); |
b411b363 PR |
2740 | break; |
2741 | case ASB_DISCONNECT: | |
2742 | break; | |
2743 | case ASB_CALL_HELPER: | |
69a22773 | 2744 | hg = drbd_asb_recover_0p(peer_device); |
b411b363 | 2745 | if (hg == -1) { |
bb437946 AG |
2746 | enum drbd_state_rv rv2; |
2747 | ||
b411b363 PR |
2748 | /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, |
2749 | * we might be here in C_WF_REPORT_PARAMS which is transient. | |
2750 | * we do not need to wait for the after state change work either. */ | |
b30ab791 | 2751 | rv2 = drbd_change_state(device, CS_VERBOSE, NS(role, R_SECONDARY)); |
bb437946 | 2752 | if (rv2 != SS_SUCCESS) { |
b30ab791 | 2753 | drbd_khelper(device, "pri-lost-after-sb"); |
b411b363 | 2754 | } else { |
d0180171 | 2755 | drbd_warn(device, "Successfully gave up primary role.\n"); |
b411b363 PR |
2756 | rv = hg; |
2757 | } | |
2758 | } else | |
2759 | rv = hg; | |
2760 | } | |
2761 | ||
2762 | return rv; | |
2763 | } | |
2764 | ||
b30ab791 | 2765 | static void drbd_uuid_dump(struct drbd_device *device, char *text, u64 *uuid, |
b411b363 PR |
2766 | u64 bits, u64 flags) |
2767 | { | |
2768 | if (!uuid) { | |
d0180171 | 2769 | drbd_info(device, "%s uuid info vanished while I was looking!\n", text); |
b411b363 PR |
2770 | return; |
2771 | } | |
d0180171 | 2772 | drbd_info(device, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", |
b411b363 PR |
2773 | text, |
2774 | (unsigned long long)uuid[UI_CURRENT], | |
2775 | (unsigned long long)uuid[UI_BITMAP], | |
2776 | (unsigned long long)uuid[UI_HISTORY_START], | |
2777 | (unsigned long long)uuid[UI_HISTORY_END], | |
2778 | (unsigned long long)bits, | |
2779 | (unsigned long long)flags); | |
2780 | } | |
2781 | ||
2782 | /* | |
2783 | 100 after split brain try auto recover | |
2784 | 2 C_SYNC_SOURCE set BitMap | |
2785 | 1 C_SYNC_SOURCE use BitMap | |
2786 | 0 no Sync | |
2787 | -1 C_SYNC_TARGET use BitMap | |
2788 | -2 C_SYNC_TARGET set BitMap | |
2789 | -100 after split brain, disconnect | |
2790 | -1000 unrelated data | |
4a23f264 PR |
2791 | -1091 requires proto 91 |
2792 | -1096 requires proto 96 | |
b411b363 | 2793 | */ |
b30ab791 | 2794 | static int drbd_uuid_compare(struct drbd_device *device, int *rule_nr) __must_hold(local) |
b411b363 PR |
2795 | { |
2796 | u64 self, peer; | |
2797 | int i, j; | |
2798 | ||
b30ab791 AG |
2799 | self = device->ldev->md.uuid[UI_CURRENT] & ~((u64)1); |
2800 | peer = device->p_uuid[UI_CURRENT] & ~((u64)1); | |
b411b363 PR |
2801 | |
2802 | *rule_nr = 10; | |
2803 | if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) | |
2804 | return 0; | |
2805 | ||
2806 | *rule_nr = 20; | |
2807 | if ((self == UUID_JUST_CREATED || self == (u64)0) && | |
2808 | peer != UUID_JUST_CREATED) | |
2809 | return -2; | |
2810 | ||
2811 | *rule_nr = 30; | |
2812 | if (self != UUID_JUST_CREATED && | |
2813 | (peer == UUID_JUST_CREATED || peer == (u64)0)) | |
2814 | return 2; | |
2815 | ||
2816 | if (self == peer) { | |
2817 | int rct, dc; /* roles at crash time */ | |
2818 | ||
b30ab791 | 2819 | if (device->p_uuid[UI_BITMAP] == (u64)0 && device->ldev->md.uuid[UI_BITMAP] != (u64)0) { |
b411b363 | 2820 | |
a6b32bc3 | 2821 | if (first_peer_device(device)->connection->agreed_pro_version < 91) |
4a23f264 | 2822 | return -1091; |
b411b363 | 2823 | |
b30ab791 AG |
2824 | if ((device->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (device->p_uuid[UI_HISTORY_START] & ~((u64)1)) && |
2825 | (device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (device->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { | |
d0180171 | 2826 | drbd_info(device, "was SyncSource, missed the resync finished event, corrected myself:\n"); |
b30ab791 AG |
2827 | drbd_uuid_move_history(device); |
2828 | device->ldev->md.uuid[UI_HISTORY_START] = device->ldev->md.uuid[UI_BITMAP]; | |
2829 | device->ldev->md.uuid[UI_BITMAP] = 0; | |
b411b363 | 2830 | |
b30ab791 AG |
2831 | drbd_uuid_dump(device, "self", device->ldev->md.uuid, |
2832 | device->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(device) : 0, 0); | |
b411b363 PR |
2833 | *rule_nr = 34; |
2834 | } else { | |
d0180171 | 2835 | drbd_info(device, "was SyncSource (peer failed to write sync_uuid)\n"); |
b411b363 PR |
2836 | *rule_nr = 36; |
2837 | } | |
2838 | ||
2839 | return 1; | |
2840 | } | |
2841 | ||
b30ab791 | 2842 | if (device->ldev->md.uuid[UI_BITMAP] == (u64)0 && device->p_uuid[UI_BITMAP] != (u64)0) { |
b411b363 | 2843 | |
a6b32bc3 | 2844 | if (first_peer_device(device)->connection->agreed_pro_version < 91) |
4a23f264 | 2845 | return -1091; |
b411b363 | 2846 | |
b30ab791 AG |
2847 | if ((device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (device->p_uuid[UI_BITMAP] & ~((u64)1)) && |
2848 | (device->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (device->p_uuid[UI_HISTORY_START] & ~((u64)1))) { | |
d0180171 | 2849 | drbd_info(device, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); |
b411b363 | 2850 | |
b30ab791 AG |
2851 | device->p_uuid[UI_HISTORY_START + 1] = device->p_uuid[UI_HISTORY_START]; |
2852 | device->p_uuid[UI_HISTORY_START] = device->p_uuid[UI_BITMAP]; | |
2853 | device->p_uuid[UI_BITMAP] = 0UL; | |
b411b363 | 2854 | |
b30ab791 | 2855 | drbd_uuid_dump(device, "peer", device->p_uuid, device->p_uuid[UI_SIZE], device->p_uuid[UI_FLAGS]); |
b411b363 PR |
2856 | *rule_nr = 35; |
2857 | } else { | |
d0180171 | 2858 | drbd_info(device, "was SyncTarget (failed to write sync_uuid)\n"); |
b411b363 PR |
2859 | *rule_nr = 37; |
2860 | } | |
2861 | ||
2862 | return -1; | |
2863 | } | |
2864 | ||
2865 | /* Common power [off|failure] */ | |
b30ab791 AG |
2866 | rct = (test_bit(CRASHED_PRIMARY, &device->flags) ? 1 : 0) + |
2867 | (device->p_uuid[UI_FLAGS] & 2); | |
b411b363 PR |
2868 | /* lowest bit is set when we were primary, |
2869 | * next bit (weight 2) is set when peer was primary */ | |
2870 | *rule_nr = 40; | |
2871 | ||
2872 | switch (rct) { | |
2873 | case 0: /* !self_pri && !peer_pri */ return 0; | |
2874 | case 1: /* self_pri && !peer_pri */ return 1; | |
2875 | case 2: /* !self_pri && peer_pri */ return -1; | |
2876 | case 3: /* self_pri && peer_pri */ | |
a6b32bc3 | 2877 | dc = test_bit(RESOLVE_CONFLICTS, &first_peer_device(device)->connection->flags); |
b411b363 PR |
2878 | return dc ? -1 : 1; |
2879 | } | |
2880 | } | |
2881 | ||
2882 | *rule_nr = 50; | |
b30ab791 | 2883 | peer = device->p_uuid[UI_BITMAP] & ~((u64)1); |
b411b363 PR |
2884 | if (self == peer) |
2885 | return -1; | |
2886 | ||
2887 | *rule_nr = 51; | |
b30ab791 | 2888 | peer = device->p_uuid[UI_HISTORY_START] & ~((u64)1); |
b411b363 | 2889 | if (self == peer) { |
a6b32bc3 | 2890 | if (first_peer_device(device)->connection->agreed_pro_version < 96 ? |
b30ab791 AG |
2891 | (device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == |
2892 | (device->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) : | |
2893 | peer + UUID_NEW_BM_OFFSET == (device->p_uuid[UI_BITMAP] & ~((u64)1))) { | |
b411b363 PR |
2894 | /* The last P_SYNC_UUID did not get though. Undo the last start of |
2895 | resync as sync source modifications of the peer's UUIDs. */ | |
2896 | ||
a6b32bc3 | 2897 | if (first_peer_device(device)->connection->agreed_pro_version < 91) |
4a23f264 | 2898 | return -1091; |
b411b363 | 2899 | |
b30ab791 AG |
2900 | device->p_uuid[UI_BITMAP] = device->p_uuid[UI_HISTORY_START]; |
2901 | device->p_uuid[UI_HISTORY_START] = device->p_uuid[UI_HISTORY_START + 1]; | |
4a23f264 | 2902 | |
d0180171 | 2903 | drbd_info(device, "Lost last syncUUID packet, corrected:\n"); |
b30ab791 | 2904 | drbd_uuid_dump(device, "peer", device->p_uuid, device->p_uuid[UI_SIZE], device->p_uuid[UI_FLAGS]); |
4a23f264 | 2905 | |
b411b363 PR |
2906 | return -1; |
2907 | } | |
2908 | } | |
2909 | ||
2910 | *rule_nr = 60; | |
b30ab791 | 2911 | self = device->ldev->md.uuid[UI_CURRENT] & ~((u64)1); |
b411b363 | 2912 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { |
b30ab791 | 2913 | peer = device->p_uuid[i] & ~((u64)1); |
b411b363 PR |
2914 | if (self == peer) |
2915 | return -2; | |
2916 | } | |
2917 | ||
2918 | *rule_nr = 70; | |
b30ab791 AG |
2919 | self = device->ldev->md.uuid[UI_BITMAP] & ~((u64)1); |
2920 | peer = device->p_uuid[UI_CURRENT] & ~((u64)1); | |
b411b363 PR |
2921 | if (self == peer) |
2922 | return 1; | |
2923 | ||
2924 | *rule_nr = 71; | |
b30ab791 | 2925 | self = device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); |
b411b363 | 2926 | if (self == peer) { |
a6b32bc3 | 2927 | if (first_peer_device(device)->connection->agreed_pro_version < 96 ? |
b30ab791 AG |
2928 | (device->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == |
2929 | (device->p_uuid[UI_HISTORY_START] & ~((u64)1)) : | |
2930 | self + UUID_NEW_BM_OFFSET == (device->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) { | |
b411b363 PR |
2931 | /* The last P_SYNC_UUID did not get though. Undo the last start of |
2932 | resync as sync source modifications of our UUIDs. */ | |
2933 | ||
a6b32bc3 | 2934 | if (first_peer_device(device)->connection->agreed_pro_version < 91) |
4a23f264 | 2935 | return -1091; |
b411b363 | 2936 | |
b30ab791 AG |
2937 | __drbd_uuid_set(device, UI_BITMAP, device->ldev->md.uuid[UI_HISTORY_START]); |
2938 | __drbd_uuid_set(device, UI_HISTORY_START, device->ldev->md.uuid[UI_HISTORY_START + 1]); | |
b411b363 | 2939 | |
d0180171 | 2940 | drbd_info(device, "Last syncUUID did not get through, corrected:\n"); |
b30ab791 AG |
2941 | drbd_uuid_dump(device, "self", device->ldev->md.uuid, |
2942 | device->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(device) : 0, 0); | |
b411b363 PR |
2943 | |
2944 | return 1; | |
2945 | } | |
2946 | } | |
2947 | ||
2948 | ||
2949 | *rule_nr = 80; | |
b30ab791 | 2950 | peer = device->p_uuid[UI_CURRENT] & ~((u64)1); |
b411b363 | 2951 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { |
b30ab791 | 2952 | self = device->ldev->md.uuid[i] & ~((u64)1); |
b411b363 PR |
2953 | if (self == peer) |
2954 | return 2; | |
2955 | } | |
2956 | ||
2957 | *rule_nr = 90; | |
b30ab791 AG |
2958 | self = device->ldev->md.uuid[UI_BITMAP] & ~((u64)1); |
2959 | peer = device->p_uuid[UI_BITMAP] & ~((u64)1); | |
b411b363 PR |
2960 | if (self == peer && self != ((u64)0)) |
2961 | return 100; | |
2962 | ||
2963 | *rule_nr = 100; | |
2964 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { | |
b30ab791 | 2965 | self = device->ldev->md.uuid[i] & ~((u64)1); |
b411b363 | 2966 | for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { |
b30ab791 | 2967 | peer = device->p_uuid[j] & ~((u64)1); |
b411b363 PR |
2968 | if (self == peer) |
2969 | return -100; | |
2970 | } | |
2971 | } | |
2972 | ||
2973 | return -1000; | |
2974 | } | |
2975 | ||
2976 | /* drbd_sync_handshake() returns the new conn state on success, or | |
2977 | CONN_MASK (-1) on failure. | |
2978 | */ | |
69a22773 AG |
2979 | static enum drbd_conns drbd_sync_handshake(struct drbd_peer_device *peer_device, |
2980 | enum drbd_role peer_role, | |
b411b363 PR |
2981 | enum drbd_disk_state peer_disk) __must_hold(local) |
2982 | { | |
69a22773 | 2983 | struct drbd_device *device = peer_device->device; |
b411b363 PR |
2984 | enum drbd_conns rv = C_MASK; |
2985 | enum drbd_disk_state mydisk; | |
44ed167d | 2986 | struct net_conf *nc; |
6dff2902 | 2987 | int hg, rule_nr, rr_conflict, tentative; |
b411b363 | 2988 | |
b30ab791 | 2989 | mydisk = device->state.disk; |
b411b363 | 2990 | if (mydisk == D_NEGOTIATING) |
b30ab791 | 2991 | mydisk = device->new_state_tmp.disk; |
b411b363 | 2992 | |
d0180171 | 2993 | drbd_info(device, "drbd_sync_handshake:\n"); |
9f2247bb | 2994 | |
b30ab791 AG |
2995 | spin_lock_irq(&device->ldev->md.uuid_lock); |
2996 | drbd_uuid_dump(device, "self", device->ldev->md.uuid, device->comm_bm_set, 0); | |
2997 | drbd_uuid_dump(device, "peer", device->p_uuid, | |
2998 | device->p_uuid[UI_SIZE], device->p_uuid[UI_FLAGS]); | |
b411b363 | 2999 | |
b30ab791 AG |
3000 | hg = drbd_uuid_compare(device, &rule_nr); |
3001 | spin_unlock_irq(&device->ldev->md.uuid_lock); | |
b411b363 | 3002 | |
d0180171 | 3003 | drbd_info(device, "uuid_compare()=%d by rule %d\n", hg, rule_nr); |
b411b363 PR |
3004 | |
3005 | if (hg == -1000) { | |
d0180171 | 3006 | drbd_alert(device, "Unrelated data, aborting!\n"); |
b411b363 PR |
3007 | return C_MASK; |
3008 | } | |
4a23f264 | 3009 | if (hg < -1000) { |
d0180171 | 3010 | drbd_alert(device, "To resolve this both sides have to support at least protocol %d\n", -hg - 1000); |
b411b363 PR |
3011 | return C_MASK; |
3012 | } | |
3013 | ||
3014 | if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || | |
3015 | (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { | |
3016 | int f = (hg == -100) || abs(hg) == 2; | |
3017 | hg = mydisk > D_INCONSISTENT ? 1 : -1; | |
3018 | if (f) | |
3019 | hg = hg*2; | |
d0180171 | 3020 | drbd_info(device, "Becoming sync %s due to disk states.\n", |
b411b363 PR |
3021 | hg > 0 ? "source" : "target"); |
3022 | } | |
3023 | ||
3a11a487 | 3024 | if (abs(hg) == 100) |
b30ab791 | 3025 | drbd_khelper(device, "initial-split-brain"); |
3a11a487 | 3026 | |
44ed167d | 3027 | rcu_read_lock(); |
69a22773 | 3028 | nc = rcu_dereference(peer_device->connection->net_conf); |
44ed167d PR |
3029 | |
3030 | if (hg == 100 || (hg == -100 && nc->always_asbp)) { | |
b30ab791 | 3031 | int pcount = (device->state.role == R_PRIMARY) |
b411b363 PR |
3032 | + (peer_role == R_PRIMARY); |
3033 | int forced = (hg == -100); | |
3034 | ||
3035 | switch (pcount) { | |
3036 | case 0: | |
69a22773 | 3037 | hg = drbd_asb_recover_0p(peer_device); |
b411b363 PR |
3038 | break; |
3039 | case 1: | |
69a22773 | 3040 | hg = drbd_asb_recover_1p(peer_device); |
b411b363 PR |
3041 | break; |
3042 | case 2: | |
69a22773 | 3043 | hg = drbd_asb_recover_2p(peer_device); |
b411b363 PR |
3044 | break; |
3045 | } | |
3046 | if (abs(hg) < 100) { | |
d0180171 | 3047 | drbd_warn(device, "Split-Brain detected, %d primaries, " |
b411b363 PR |
3048 | "automatically solved. Sync from %s node\n", |
3049 | pcount, (hg < 0) ? "peer" : "this"); | |
3050 | if (forced) { | |
d0180171 | 3051 | drbd_warn(device, "Doing a full sync, since" |
b411b363 PR |
3052 | " UUIDs where ambiguous.\n"); |
3053 | hg = hg*2; | |
3054 | } | |
3055 | } | |
3056 | } | |
3057 | ||
3058 | if (hg == -100) { | |
b30ab791 | 3059 | if (test_bit(DISCARD_MY_DATA, &device->flags) && !(device->p_uuid[UI_FLAGS]&1)) |
b411b363 | 3060 | hg = -1; |
b30ab791 | 3061 | if (!test_bit(DISCARD_MY_DATA, &device->flags) && (device->p_uuid[UI_FLAGS]&1)) |
b411b363 PR |
3062 | hg = 1; |
3063 | ||
3064 | if (abs(hg) < 100) | |
d0180171 | 3065 | drbd_warn(device, "Split-Brain detected, manually solved. " |
b411b363 PR |
3066 | "Sync from %s node\n", |
3067 | (hg < 0) ? "peer" : "this"); | |
3068 | } | |
44ed167d | 3069 | rr_conflict = nc->rr_conflict; |
6dff2902 | 3070 | tentative = nc->tentative; |
44ed167d | 3071 | rcu_read_unlock(); |
b411b363 PR |
3072 | |
3073 | if (hg == -100) { | |
580b9767 LE |
3074 | /* FIXME this log message is not correct if we end up here |
3075 | * after an attempted attach on a diskless node. | |
3076 | * We just refuse to attach -- well, we drop the "connection" | |
3077 | * to that disk, in a way... */ | |
d0180171 | 3078 | drbd_alert(device, "Split-Brain detected but unresolved, dropping connection!\n"); |
b30ab791 | 3079 | drbd_khelper(device, "split-brain"); |
b411b363 PR |
3080 | return C_MASK; |
3081 | } | |
3082 | ||
3083 | if (hg > 0 && mydisk <= D_INCONSISTENT) { | |
d0180171 | 3084 | drbd_err(device, "I shall become SyncSource, but I am inconsistent!\n"); |
b411b363 PR |
3085 | return C_MASK; |
3086 | } | |
3087 | ||
3088 | if (hg < 0 && /* by intention we do not use mydisk here. */ | |
b30ab791 | 3089 | device->state.role == R_PRIMARY && device->state.disk >= D_CONSISTENT) { |
44ed167d | 3090 | switch (rr_conflict) { |
b411b363 | 3091 | case ASB_CALL_HELPER: |
b30ab791 | 3092 | drbd_khelper(device, "pri-lost"); |
b411b363 PR |
3093 | /* fall through */ |
3094 | case ASB_DISCONNECT: | |
d0180171 | 3095 | drbd_err(device, "I shall become SyncTarget, but I am primary!\n"); |
b411b363 PR |
3096 | return C_MASK; |
3097 | case ASB_VIOLENTLY: | |
d0180171 | 3098 | drbd_warn(device, "Becoming SyncTarget, violating the stable-data" |
b411b363 PR |
3099 | "assumption\n"); |
3100 | } | |
3101 | } | |
3102 | ||
69a22773 | 3103 | if (tentative || test_bit(CONN_DRY_RUN, &peer_device->connection->flags)) { |
cf14c2e9 | 3104 | if (hg == 0) |
d0180171 | 3105 | drbd_info(device, "dry-run connect: No resync, would become Connected immediately.\n"); |
cf14c2e9 | 3106 | else |
d0180171 | 3107 | drbd_info(device, "dry-run connect: Would become %s, doing a %s resync.", |
cf14c2e9 PR |
3108 | drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), |
3109 | abs(hg) >= 2 ? "full" : "bit-map based"); | |
3110 | return C_MASK; | |
3111 | } | |
3112 | ||
b411b363 | 3113 | if (abs(hg) >= 2) { |
d0180171 | 3114 | drbd_info(device, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); |
b30ab791 | 3115 | if (drbd_bitmap_io(device, &drbd_bmio_set_n_write, "set_n_write from sync_handshake", |
20ceb2b2 | 3116 | BM_LOCKED_SET_ALLOWED)) |
b411b363 PR |
3117 | return C_MASK; |
3118 | } | |
3119 | ||
3120 | if (hg > 0) { /* become sync source. */ | |
3121 | rv = C_WF_BITMAP_S; | |
3122 | } else if (hg < 0) { /* become sync target */ | |
3123 | rv = C_WF_BITMAP_T; | |
3124 | } else { | |
3125 | rv = C_CONNECTED; | |
b30ab791 | 3126 | if (drbd_bm_total_weight(device)) { |
d0180171 | 3127 | drbd_info(device, "No resync, but %lu bits in bitmap!\n", |
b30ab791 | 3128 | drbd_bm_total_weight(device)); |
b411b363 PR |
3129 | } |
3130 | } | |
3131 | ||
3132 | return rv; | |
3133 | } | |
3134 | ||
f179d76d | 3135 | static enum drbd_after_sb_p convert_after_sb(enum drbd_after_sb_p peer) |
b411b363 PR |
3136 | { |
3137 | /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ | |
f179d76d PR |
3138 | if (peer == ASB_DISCARD_REMOTE) |
3139 | return ASB_DISCARD_LOCAL; | |
b411b363 PR |
3140 | |
3141 | /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ | |
f179d76d PR |
3142 | if (peer == ASB_DISCARD_LOCAL) |
3143 | return ASB_DISCARD_REMOTE; | |
b411b363 PR |
3144 | |
3145 | /* everything else is valid if they are equal on both sides. */ | |
f179d76d | 3146 | return peer; |
b411b363 PR |
3147 | } |
3148 | ||
bde89a9e | 3149 | static int receive_protocol(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 3150 | { |
e658983a | 3151 | struct p_protocol *p = pi->data; |
036b17ea PR |
3152 | enum drbd_after_sb_p p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; |
3153 | int p_proto, p_discard_my_data, p_two_primaries, cf; | |
3154 | struct net_conf *nc, *old_net_conf, *new_net_conf = NULL; | |
3155 | char integrity_alg[SHARED_SECRET_MAX] = ""; | |
accdbcc5 | 3156 | struct crypto_hash *peer_integrity_tfm = NULL; |
7aca6c75 | 3157 | void *int_dig_in = NULL, *int_dig_vv = NULL; |
b411b363 | 3158 | |
b411b363 PR |
3159 | p_proto = be32_to_cpu(p->protocol); |
3160 | p_after_sb_0p = be32_to_cpu(p->after_sb_0p); | |
3161 | p_after_sb_1p = be32_to_cpu(p->after_sb_1p); | |
3162 | p_after_sb_2p = be32_to_cpu(p->after_sb_2p); | |
b411b363 | 3163 | p_two_primaries = be32_to_cpu(p->two_primaries); |
cf14c2e9 | 3164 | cf = be32_to_cpu(p->conn_flags); |
6139f60d | 3165 | p_discard_my_data = cf & CF_DISCARD_MY_DATA; |
cf14c2e9 | 3166 | |
bde89a9e | 3167 | if (connection->agreed_pro_version >= 87) { |
86db0618 | 3168 | int err; |
cf14c2e9 | 3169 | |
88104ca4 | 3170 | if (pi->size > sizeof(integrity_alg)) |
86db0618 | 3171 | return -EIO; |
bde89a9e | 3172 | err = drbd_recv_all(connection, integrity_alg, pi->size); |
86db0618 AG |
3173 | if (err) |
3174 | return err; | |
036b17ea | 3175 | integrity_alg[SHARED_SECRET_MAX - 1] = 0; |
b411b363 PR |
3176 | } |
3177 | ||
7d4c782c | 3178 | if (pi->cmd != P_PROTOCOL_UPDATE) { |
bde89a9e | 3179 | clear_bit(CONN_DRY_RUN, &connection->flags); |
b411b363 | 3180 | |
fbc12f45 | 3181 | if (cf & CF_DRY_RUN) |
bde89a9e | 3182 | set_bit(CONN_DRY_RUN, &connection->flags); |
b411b363 | 3183 | |
fbc12f45 | 3184 | rcu_read_lock(); |
bde89a9e | 3185 | nc = rcu_dereference(connection->net_conf); |
b411b363 | 3186 | |
fbc12f45 | 3187 | if (p_proto != nc->wire_protocol) { |
1ec861eb | 3188 | drbd_err(connection, "incompatible %s settings\n", "protocol"); |
fbc12f45 AG |
3189 | goto disconnect_rcu_unlock; |
3190 | } | |
b411b363 | 3191 | |
fbc12f45 | 3192 | if (convert_after_sb(p_after_sb_0p) != nc->after_sb_0p) { |
1ec861eb | 3193 | drbd_err(connection, "incompatible %s settings\n", "after-sb-0pri"); |
fbc12f45 AG |
3194 | goto disconnect_rcu_unlock; |
3195 | } | |
b411b363 | 3196 | |
fbc12f45 | 3197 | if (convert_after_sb(p_after_sb_1p) != nc->after_sb_1p) { |
1ec861eb | 3198 | drbd_err(connection, "incompatible %s settings\n", "after-sb-1pri"); |
fbc12f45 AG |
3199 | goto disconnect_rcu_unlock; |
3200 | } | |
b411b363 | 3201 | |
fbc12f45 | 3202 | if (convert_after_sb(p_after_sb_2p) != nc->after_sb_2p) { |
1ec861eb | 3203 | drbd_err(connection, "incompatible %s settings\n", "after-sb-2pri"); |
fbc12f45 AG |
3204 | goto disconnect_rcu_unlock; |
3205 | } | |
b411b363 | 3206 | |
fbc12f45 | 3207 | if (p_discard_my_data && nc->discard_my_data) { |
1ec861eb | 3208 | drbd_err(connection, "incompatible %s settings\n", "discard-my-data"); |
fbc12f45 AG |
3209 | goto disconnect_rcu_unlock; |
3210 | } | |
b411b363 | 3211 | |
fbc12f45 | 3212 | if (p_two_primaries != nc->two_primaries) { |
1ec861eb | 3213 | drbd_err(connection, "incompatible %s settings\n", "allow-two-primaries"); |
fbc12f45 AG |
3214 | goto disconnect_rcu_unlock; |
3215 | } | |
b411b363 | 3216 | |
fbc12f45 | 3217 | if (strcmp(integrity_alg, nc->integrity_alg)) { |
1ec861eb | 3218 | drbd_err(connection, "incompatible %s settings\n", "data-integrity-alg"); |
fbc12f45 AG |
3219 | goto disconnect_rcu_unlock; |
3220 | } | |
b411b363 | 3221 | |
fbc12f45 | 3222 | rcu_read_unlock(); |
b411b363 PR |
3223 | } |
3224 | ||
7d4c782c AG |
3225 | if (integrity_alg[0]) { |
3226 | int hash_size; | |
3227 | ||
3228 | /* | |
3229 | * We can only change the peer data integrity algorithm | |
3230 | * here. Changing our own data integrity algorithm | |
3231 | * requires that we send a P_PROTOCOL_UPDATE packet at | |
3232 | * the same time; otherwise, the peer has no way to | |
3233 | * tell between which packets the algorithm should | |
3234 | * change. | |
3235 | */ | |
b411b363 | 3236 | |
7d4c782c AG |
3237 | peer_integrity_tfm = crypto_alloc_hash(integrity_alg, 0, CRYPTO_ALG_ASYNC); |
3238 | if (!peer_integrity_tfm) { | |
1ec861eb | 3239 | drbd_err(connection, "peer data-integrity-alg %s not supported\n", |
7d4c782c AG |
3240 | integrity_alg); |
3241 | goto disconnect; | |
3242 | } | |
b411b363 | 3243 | |
7d4c782c AG |
3244 | hash_size = crypto_hash_digestsize(peer_integrity_tfm); |
3245 | int_dig_in = kmalloc(hash_size, GFP_KERNEL); | |
3246 | int_dig_vv = kmalloc(hash_size, GFP_KERNEL); | |
3247 | if (!(int_dig_in && int_dig_vv)) { | |
1ec861eb | 3248 | drbd_err(connection, "Allocation of buffers for data integrity checking failed\n"); |
b411b363 PR |
3249 | goto disconnect; |
3250 | } | |
b411b363 PR |
3251 | } |
3252 | ||
7d4c782c AG |
3253 | new_net_conf = kmalloc(sizeof(struct net_conf), GFP_KERNEL); |
3254 | if (!new_net_conf) { | |
1ec861eb | 3255 | drbd_err(connection, "Allocation of new net_conf failed\n"); |
7d4c782c AG |
3256 | goto disconnect; |
3257 | } | |
3258 | ||
bde89a9e | 3259 | mutex_lock(&connection->data.mutex); |
0500813f | 3260 | mutex_lock(&connection->resource->conf_update); |
bde89a9e | 3261 | old_net_conf = connection->net_conf; |
7d4c782c AG |
3262 | *new_net_conf = *old_net_conf; |
3263 | ||
3264 | new_net_conf->wire_protocol = p_proto; | |
3265 | new_net_conf->after_sb_0p = convert_after_sb(p_after_sb_0p); | |
3266 | new_net_conf->after_sb_1p = convert_after_sb(p_after_sb_1p); | |
3267 | new_net_conf->after_sb_2p = convert_after_sb(p_after_sb_2p); | |
3268 | new_net_conf->two_primaries = p_two_primaries; | |
3269 | ||
bde89a9e | 3270 | rcu_assign_pointer(connection->net_conf, new_net_conf); |
0500813f | 3271 | mutex_unlock(&connection->resource->conf_update); |
bde89a9e | 3272 | mutex_unlock(&connection->data.mutex); |
7d4c782c | 3273 | |
bde89a9e AG |
3274 | crypto_free_hash(connection->peer_integrity_tfm); |
3275 | kfree(connection->int_dig_in); | |
3276 | kfree(connection->int_dig_vv); | |
3277 | connection->peer_integrity_tfm = peer_integrity_tfm; | |
3278 | connection->int_dig_in = int_dig_in; | |
3279 | connection->int_dig_vv = int_dig_vv; | |
7d4c782c AG |
3280 | |
3281 | if (strcmp(old_net_conf->integrity_alg, integrity_alg)) | |
1ec861eb | 3282 | drbd_info(connection, "peer data-integrity-alg: %s\n", |
7d4c782c AG |
3283 | integrity_alg[0] ? integrity_alg : "(none)"); |
3284 | ||
3285 | synchronize_rcu(); | |
3286 | kfree(old_net_conf); | |
82bc0194 | 3287 | return 0; |
b411b363 | 3288 | |
44ed167d PR |
3289 | disconnect_rcu_unlock: |
3290 | rcu_read_unlock(); | |
b411b363 | 3291 | disconnect: |
b792c35c | 3292 | crypto_free_hash(peer_integrity_tfm); |
036b17ea PR |
3293 | kfree(int_dig_in); |
3294 | kfree(int_dig_vv); | |
bde89a9e | 3295 | conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 3296 | return -EIO; |
b411b363 PR |
3297 | } |
3298 | ||
3299 | /* helper function | |
3300 | * input: alg name, feature name | |
3301 | * return: NULL (alg name was "") | |
3302 | * ERR_PTR(error) if something goes wrong | |
3303 | * or the crypto hash ptr, if it worked out ok. */ | |
f63e631a | 3304 | static |
b30ab791 | 3305 | struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_device *device, |
b411b363 PR |
3306 | const char *alg, const char *name) |
3307 | { | |
3308 | struct crypto_hash *tfm; | |
3309 | ||
3310 | if (!alg[0]) | |
3311 | return NULL; | |
3312 | ||
3313 | tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC); | |
3314 | if (IS_ERR(tfm)) { | |
d0180171 | 3315 | drbd_err(device, "Can not allocate \"%s\" as %s (reason: %ld)\n", |
b411b363 PR |
3316 | alg, name, PTR_ERR(tfm)); |
3317 | return tfm; | |
3318 | } | |
b411b363 PR |
3319 | return tfm; |
3320 | } | |
3321 | ||
bde89a9e | 3322 | static int ignore_remaining_packet(struct drbd_connection *connection, struct packet_info *pi) |
4a76b161 | 3323 | { |
bde89a9e | 3324 | void *buffer = connection->data.rbuf; |
4a76b161 AG |
3325 | int size = pi->size; |
3326 | ||
3327 | while (size) { | |
3328 | int s = min_t(int, size, DRBD_SOCKET_BUFFER_SIZE); | |
bde89a9e | 3329 | s = drbd_recv(connection, buffer, s); |
4a76b161 AG |
3330 | if (s <= 0) { |
3331 | if (s < 0) | |
3332 | return s; | |
3333 | break; | |
3334 | } | |
3335 | size -= s; | |
3336 | } | |
3337 | if (size) | |
3338 | return -EIO; | |
3339 | return 0; | |
3340 | } | |
3341 | ||
3342 | /* | |
3343 | * config_unknown_volume - device configuration command for unknown volume | |
3344 | * | |
3345 | * When a device is added to an existing connection, the node on which the | |
3346 | * device is added first will send configuration commands to its peer but the | |
3347 | * peer will not know about the device yet. It will warn and ignore these | |
3348 | * commands. Once the device is added on the second node, the second node will | |
3349 | * send the same device configuration commands, but in the other direction. | |
3350 | * | |
3351 | * (We can also end up here if drbd is misconfigured.) | |
3352 | */ | |
bde89a9e | 3353 | static int config_unknown_volume(struct drbd_connection *connection, struct packet_info *pi) |
4a76b161 | 3354 | { |
1ec861eb | 3355 | drbd_warn(connection, "%s packet received for volume %u, which is not configured locally\n", |
2fcb8f30 | 3356 | cmdname(pi->cmd), pi->vnr); |
bde89a9e | 3357 | return ignore_remaining_packet(connection, pi); |
4a76b161 AG |
3358 | } |
3359 | ||
bde89a9e | 3360 | static int receive_SyncParam(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 3361 | { |
9f4fe9ad | 3362 | struct drbd_peer_device *peer_device; |
b30ab791 | 3363 | struct drbd_device *device; |
e658983a | 3364 | struct p_rs_param_95 *p; |
b411b363 PR |
3365 | unsigned int header_size, data_size, exp_max_sz; |
3366 | struct crypto_hash *verify_tfm = NULL; | |
3367 | struct crypto_hash *csums_tfm = NULL; | |
2ec91e0e | 3368 | struct net_conf *old_net_conf, *new_net_conf = NULL; |
813472ce | 3369 | struct disk_conf *old_disk_conf = NULL, *new_disk_conf = NULL; |
bde89a9e | 3370 | const int apv = connection->agreed_pro_version; |
813472ce | 3371 | struct fifo_buffer *old_plan = NULL, *new_plan = NULL; |
778f271d | 3372 | int fifo_size = 0; |
82bc0194 | 3373 | int err; |
b411b363 | 3374 | |
9f4fe9ad AG |
3375 | peer_device = conn_peer_device(connection, pi->vnr); |
3376 | if (!peer_device) | |
bde89a9e | 3377 | return config_unknown_volume(connection, pi); |
9f4fe9ad | 3378 | device = peer_device->device; |
b411b363 PR |
3379 | |
3380 | exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) | |
3381 | : apv == 88 ? sizeof(struct p_rs_param) | |
3382 | + SHARED_SECRET_MAX | |
8e26f9cc PR |
3383 | : apv <= 94 ? sizeof(struct p_rs_param_89) |
3384 | : /* apv >= 95 */ sizeof(struct p_rs_param_95); | |
b411b363 | 3385 | |
e2857216 | 3386 | if (pi->size > exp_max_sz) { |
d0180171 | 3387 | drbd_err(device, "SyncParam packet too long: received %u, expected <= %u bytes\n", |
e2857216 | 3388 | pi->size, exp_max_sz); |
82bc0194 | 3389 | return -EIO; |
b411b363 PR |
3390 | } |
3391 | ||
3392 | if (apv <= 88) { | |
e658983a | 3393 | header_size = sizeof(struct p_rs_param); |
e2857216 | 3394 | data_size = pi->size - header_size; |
8e26f9cc | 3395 | } else if (apv <= 94) { |
e658983a | 3396 | header_size = sizeof(struct p_rs_param_89); |
e2857216 | 3397 | data_size = pi->size - header_size; |
0b0ba1ef | 3398 | D_ASSERT(device, data_size == 0); |
8e26f9cc | 3399 | } else { |
e658983a | 3400 | header_size = sizeof(struct p_rs_param_95); |
e2857216 | 3401 | data_size = pi->size - header_size; |
0b0ba1ef | 3402 | D_ASSERT(device, data_size == 0); |
b411b363 PR |
3403 | } |
3404 | ||
3405 | /* initialize verify_alg and csums_alg */ | |
e658983a | 3406 | p = pi->data; |
b411b363 PR |
3407 | memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); |
3408 | ||
9f4fe9ad | 3409 | err = drbd_recv_all(peer_device->connection, p, header_size); |
82bc0194 AG |
3410 | if (err) |
3411 | return err; | |
b411b363 | 3412 | |
0500813f | 3413 | mutex_lock(&connection->resource->conf_update); |
9f4fe9ad | 3414 | old_net_conf = peer_device->connection->net_conf; |
b30ab791 | 3415 | if (get_ldev(device)) { |
813472ce PR |
3416 | new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); |
3417 | if (!new_disk_conf) { | |
b30ab791 | 3418 | put_ldev(device); |
0500813f | 3419 | mutex_unlock(&connection->resource->conf_update); |
d0180171 | 3420 | drbd_err(device, "Allocation of new disk_conf failed\n"); |
813472ce PR |
3421 | return -ENOMEM; |
3422 | } | |
daeda1cc | 3423 | |
b30ab791 | 3424 | old_disk_conf = device->ldev->disk_conf; |
813472ce | 3425 | *new_disk_conf = *old_disk_conf; |
b411b363 | 3426 | |
6394b935 | 3427 | new_disk_conf->resync_rate = be32_to_cpu(p->resync_rate); |
813472ce | 3428 | } |
b411b363 PR |
3429 | |
3430 | if (apv >= 88) { | |
3431 | if (apv == 88) { | |
5de73827 | 3432 | if (data_size > SHARED_SECRET_MAX || data_size == 0) { |
d0180171 | 3433 | drbd_err(device, "verify-alg of wrong size, " |
5de73827 PR |
3434 | "peer wants %u, accepting only up to %u byte\n", |
3435 | data_size, SHARED_SECRET_MAX); | |
813472ce PR |
3436 | err = -EIO; |
3437 | goto reconnect; | |
b411b363 PR |
3438 | } |
3439 | ||
9f4fe9ad | 3440 | err = drbd_recv_all(peer_device->connection, p->verify_alg, data_size); |
813472ce PR |
3441 | if (err) |
3442 | goto reconnect; | |
b411b363 PR |
3443 | /* we expect NUL terminated string */ |
3444 | /* but just in case someone tries to be evil */ | |
0b0ba1ef | 3445 | D_ASSERT(device, p->verify_alg[data_size-1] == 0); |
b411b363 PR |
3446 | p->verify_alg[data_size-1] = 0; |
3447 | ||
3448 | } else /* apv >= 89 */ { | |
3449 | /* we still expect NUL terminated strings */ | |
3450 | /* but just in case someone tries to be evil */ | |
0b0ba1ef AG |
3451 | D_ASSERT(device, p->verify_alg[SHARED_SECRET_MAX-1] == 0); |
3452 | D_ASSERT(device, p->csums_alg[SHARED_SECRET_MAX-1] == 0); | |
b411b363 PR |
3453 | p->verify_alg[SHARED_SECRET_MAX-1] = 0; |
3454 | p->csums_alg[SHARED_SECRET_MAX-1] = 0; | |
3455 | } | |
3456 | ||
2ec91e0e | 3457 | if (strcmp(old_net_conf->verify_alg, p->verify_alg)) { |
b30ab791 | 3458 | if (device->state.conn == C_WF_REPORT_PARAMS) { |
d0180171 | 3459 | drbd_err(device, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", |
2ec91e0e | 3460 | old_net_conf->verify_alg, p->verify_alg); |
b411b363 PR |
3461 | goto disconnect; |
3462 | } | |
b30ab791 | 3463 | verify_tfm = drbd_crypto_alloc_digest_safe(device, |
b411b363 PR |
3464 | p->verify_alg, "verify-alg"); |
3465 | if (IS_ERR(verify_tfm)) { | |
3466 | verify_tfm = NULL; | |
3467 | goto disconnect; | |
3468 | } | |
3469 | } | |
3470 | ||
2ec91e0e | 3471 | if (apv >= 89 && strcmp(old_net_conf->csums_alg, p->csums_alg)) { |
b30ab791 | 3472 | if (device->state.conn == C_WF_REPORT_PARAMS) { |
d0180171 | 3473 | drbd_err(device, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", |
2ec91e0e | 3474 | old_net_conf->csums_alg, p->csums_alg); |
b411b363 PR |
3475 | goto disconnect; |
3476 | } | |
b30ab791 | 3477 | csums_tfm = drbd_crypto_alloc_digest_safe(device, |
b411b363 PR |
3478 | p->csums_alg, "csums-alg"); |
3479 | if (IS_ERR(csums_tfm)) { | |
3480 | csums_tfm = NULL; | |
3481 | goto disconnect; | |
3482 | } | |
3483 | } | |
3484 | ||
813472ce | 3485 | if (apv > 94 && new_disk_conf) { |
daeda1cc PR |
3486 | new_disk_conf->c_plan_ahead = be32_to_cpu(p->c_plan_ahead); |
3487 | new_disk_conf->c_delay_target = be32_to_cpu(p->c_delay_target); | |
3488 | new_disk_conf->c_fill_target = be32_to_cpu(p->c_fill_target); | |
3489 | new_disk_conf->c_max_rate = be32_to_cpu(p->c_max_rate); | |
778f271d | 3490 | |
daeda1cc | 3491 | fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ; |
b30ab791 | 3492 | if (fifo_size != device->rs_plan_s->size) { |
813472ce PR |
3493 | new_plan = fifo_alloc(fifo_size); |
3494 | if (!new_plan) { | |
d0180171 | 3495 | drbd_err(device, "kmalloc of fifo_buffer failed"); |
b30ab791 | 3496 | put_ldev(device); |
778f271d PR |
3497 | goto disconnect; |
3498 | } | |
3499 | } | |
8e26f9cc | 3500 | } |
b411b363 | 3501 | |
91fd4dad | 3502 | if (verify_tfm || csums_tfm) { |
2ec91e0e PR |
3503 | new_net_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL); |
3504 | if (!new_net_conf) { | |
d0180171 | 3505 | drbd_err(device, "Allocation of new net_conf failed\n"); |
91fd4dad PR |
3506 | goto disconnect; |
3507 | } | |
3508 | ||
2ec91e0e | 3509 | *new_net_conf = *old_net_conf; |
91fd4dad PR |
3510 | |
3511 | if (verify_tfm) { | |
2ec91e0e PR |
3512 | strcpy(new_net_conf->verify_alg, p->verify_alg); |
3513 | new_net_conf->verify_alg_len = strlen(p->verify_alg) + 1; | |
9f4fe9ad AG |
3514 | crypto_free_hash(peer_device->connection->verify_tfm); |
3515 | peer_device->connection->verify_tfm = verify_tfm; | |
d0180171 | 3516 | drbd_info(device, "using verify-alg: \"%s\"\n", p->verify_alg); |
91fd4dad PR |
3517 | } |
3518 | if (csums_tfm) { | |
2ec91e0e PR |
3519 | strcpy(new_net_conf->csums_alg, p->csums_alg); |
3520 | new_net_conf->csums_alg_len = strlen(p->csums_alg) + 1; | |
9f4fe9ad AG |
3521 | crypto_free_hash(peer_device->connection->csums_tfm); |
3522 | peer_device->connection->csums_tfm = csums_tfm; | |
d0180171 | 3523 | drbd_info(device, "using csums-alg: \"%s\"\n", p->csums_alg); |
91fd4dad | 3524 | } |
bde89a9e | 3525 | rcu_assign_pointer(connection->net_conf, new_net_conf); |
778f271d | 3526 | } |
b411b363 PR |
3527 | } |
3528 | ||
813472ce | 3529 | if (new_disk_conf) { |
b30ab791 AG |
3530 | rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf); |
3531 | put_ldev(device); | |
813472ce PR |
3532 | } |
3533 | ||
3534 | if (new_plan) { | |
b30ab791 AG |
3535 | old_plan = device->rs_plan_s; |
3536 | rcu_assign_pointer(device->rs_plan_s, new_plan); | |
b411b363 | 3537 | } |
daeda1cc | 3538 | |
0500813f | 3539 | mutex_unlock(&connection->resource->conf_update); |
daeda1cc PR |
3540 | synchronize_rcu(); |
3541 | if (new_net_conf) | |
3542 | kfree(old_net_conf); | |
3543 | kfree(old_disk_conf); | |
813472ce | 3544 | kfree(old_plan); |
daeda1cc | 3545 | |
82bc0194 | 3546 | return 0; |
b411b363 | 3547 | |
813472ce PR |
3548 | reconnect: |
3549 | if (new_disk_conf) { | |
b30ab791 | 3550 | put_ldev(device); |
813472ce PR |
3551 | kfree(new_disk_conf); |
3552 | } | |
0500813f | 3553 | mutex_unlock(&connection->resource->conf_update); |
813472ce PR |
3554 | return -EIO; |
3555 | ||
b411b363 | 3556 | disconnect: |
813472ce PR |
3557 | kfree(new_plan); |
3558 | if (new_disk_conf) { | |
b30ab791 | 3559 | put_ldev(device); |
813472ce PR |
3560 | kfree(new_disk_conf); |
3561 | } | |
0500813f | 3562 | mutex_unlock(&connection->resource->conf_update); |
b411b363 PR |
3563 | /* just for completeness: actually not needed, |
3564 | * as this is not reached if csums_tfm was ok. */ | |
3565 | crypto_free_hash(csums_tfm); | |
3566 | /* but free the verify_tfm again, if csums_tfm did not work out */ | |
3567 | crypto_free_hash(verify_tfm); | |
9f4fe9ad | 3568 | conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 3569 | return -EIO; |
b411b363 PR |
3570 | } |
3571 | ||
b411b363 | 3572 | /* warn if the arguments differ by more than 12.5% */ |
b30ab791 | 3573 | static void warn_if_differ_considerably(struct drbd_device *device, |
b411b363 PR |
3574 | const char *s, sector_t a, sector_t b) |
3575 | { | |
3576 | sector_t d; | |
3577 | if (a == 0 || b == 0) | |
3578 | return; | |
3579 | d = (a > b) ? (a - b) : (b - a); | |
3580 | if (d > (a>>3) || d > (b>>3)) | |
d0180171 | 3581 | drbd_warn(device, "Considerable difference in %s: %llus vs. %llus\n", s, |
b411b363 PR |
3582 | (unsigned long long)a, (unsigned long long)b); |
3583 | } | |
3584 | ||
bde89a9e | 3585 | static int receive_sizes(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 3586 | { |
9f4fe9ad | 3587 | struct drbd_peer_device *peer_device; |
b30ab791 | 3588 | struct drbd_device *device; |
e658983a | 3589 | struct p_sizes *p = pi->data; |
e96c9633 | 3590 | enum determine_dev_size dd = DS_UNCHANGED; |
b411b363 PR |
3591 | sector_t p_size, p_usize, my_usize; |
3592 | int ldsc = 0; /* local disk size changed */ | |
e89b591c | 3593 | enum dds_flags ddsf; |
b411b363 | 3594 | |
9f4fe9ad AG |
3595 | peer_device = conn_peer_device(connection, pi->vnr); |
3596 | if (!peer_device) | |
bde89a9e | 3597 | return config_unknown_volume(connection, pi); |
9f4fe9ad | 3598 | device = peer_device->device; |
4a76b161 | 3599 | |
b411b363 PR |
3600 | p_size = be64_to_cpu(p->d_size); |
3601 | p_usize = be64_to_cpu(p->u_size); | |
3602 | ||
b411b363 PR |
3603 | /* just store the peer's disk size for now. |
3604 | * we still need to figure out whether we accept that. */ | |
b30ab791 | 3605 | device->p_size = p_size; |
b411b363 | 3606 | |
b30ab791 | 3607 | if (get_ldev(device)) { |
daeda1cc | 3608 | rcu_read_lock(); |
b30ab791 | 3609 | my_usize = rcu_dereference(device->ldev->disk_conf)->disk_size; |
daeda1cc PR |
3610 | rcu_read_unlock(); |
3611 | ||
b30ab791 AG |
3612 | warn_if_differ_considerably(device, "lower level device sizes", |
3613 | p_size, drbd_get_max_capacity(device->ldev)); | |
3614 | warn_if_differ_considerably(device, "user requested size", | |
daeda1cc | 3615 | p_usize, my_usize); |
b411b363 PR |
3616 | |
3617 | /* if this is the first connect, or an otherwise expected | |
3618 | * param exchange, choose the minimum */ | |
b30ab791 | 3619 | if (device->state.conn == C_WF_REPORT_PARAMS) |
daeda1cc | 3620 | p_usize = min_not_zero(my_usize, p_usize); |
b411b363 PR |
3621 | |
3622 | /* Never shrink a device with usable data during connect. | |
3623 | But allow online shrinking if we are connected. */ | |
b30ab791 AG |
3624 | if (drbd_new_dev_size(device, device->ldev, p_usize, 0) < |
3625 | drbd_get_capacity(device->this_bdev) && | |
3626 | device->state.disk >= D_OUTDATED && | |
3627 | device->state.conn < C_CONNECTED) { | |
d0180171 | 3628 | drbd_err(device, "The peer's disk size is too small!\n"); |
9f4fe9ad | 3629 | conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
b30ab791 | 3630 | put_ldev(device); |
82bc0194 | 3631 | return -EIO; |
b411b363 | 3632 | } |
daeda1cc PR |
3633 | |
3634 | if (my_usize != p_usize) { | |
3635 | struct disk_conf *old_disk_conf, *new_disk_conf = NULL; | |
3636 | ||
3637 | new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); | |
3638 | if (!new_disk_conf) { | |
d0180171 | 3639 | drbd_err(device, "Allocation of new disk_conf failed\n"); |
b30ab791 | 3640 | put_ldev(device); |
daeda1cc PR |
3641 | return -ENOMEM; |
3642 | } | |
3643 | ||
0500813f | 3644 | mutex_lock(&connection->resource->conf_update); |
b30ab791 | 3645 | old_disk_conf = device->ldev->disk_conf; |
daeda1cc PR |
3646 | *new_disk_conf = *old_disk_conf; |
3647 | new_disk_conf->disk_size = p_usize; | |
3648 | ||
b30ab791 | 3649 | rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf); |
0500813f | 3650 | mutex_unlock(&connection->resource->conf_update); |
daeda1cc PR |
3651 | synchronize_rcu(); |
3652 | kfree(old_disk_conf); | |
3653 | ||
d0180171 | 3654 | drbd_info(device, "Peer sets u_size to %lu sectors\n", |
daeda1cc | 3655 | (unsigned long)my_usize); |
b411b363 | 3656 | } |
daeda1cc | 3657 | |
b30ab791 | 3658 | put_ldev(device); |
b411b363 | 3659 | } |
b411b363 | 3660 | |
e89b591c | 3661 | ddsf = be16_to_cpu(p->dds_flags); |
b30ab791 AG |
3662 | if (get_ldev(device)) { |
3663 | dd = drbd_determine_dev_size(device, ddsf, NULL); | |
3664 | put_ldev(device); | |
e96c9633 | 3665 | if (dd == DS_ERROR) |
82bc0194 | 3666 | return -EIO; |
b30ab791 | 3667 | drbd_md_sync(device); |
b411b363 PR |
3668 | } else { |
3669 | /* I am diskless, need to accept the peer's size. */ | |
b30ab791 | 3670 | drbd_set_my_capacity(device, p_size); |
b411b363 PR |
3671 | } |
3672 | ||
b30ab791 AG |
3673 | device->peer_max_bio_size = be32_to_cpu(p->max_bio_size); |
3674 | drbd_reconsider_max_bio_size(device); | |
99432fcc | 3675 | |
b30ab791 AG |
3676 | if (get_ldev(device)) { |
3677 | if (device->ldev->known_size != drbd_get_capacity(device->ldev->backing_bdev)) { | |
3678 | device->ldev->known_size = drbd_get_capacity(device->ldev->backing_bdev); | |
b411b363 PR |
3679 | ldsc = 1; |
3680 | } | |
3681 | ||
b30ab791 | 3682 | put_ldev(device); |
b411b363 PR |
3683 | } |
3684 | ||
b30ab791 | 3685 | if (device->state.conn > C_WF_REPORT_PARAMS) { |
b411b363 | 3686 | if (be64_to_cpu(p->c_size) != |
b30ab791 | 3687 | drbd_get_capacity(device->this_bdev) || ldsc) { |
b411b363 PR |
3688 | /* we have different sizes, probably peer |
3689 | * needs to know my new size... */ | |
69a22773 | 3690 | drbd_send_sizes(peer_device, 0, ddsf); |
b411b363 | 3691 | } |
b30ab791 AG |
3692 | if (test_and_clear_bit(RESIZE_PENDING, &device->flags) || |
3693 | (dd == DS_GREW && device->state.conn == C_CONNECTED)) { | |
3694 | if (device->state.pdsk >= D_INCONSISTENT && | |
3695 | device->state.disk >= D_INCONSISTENT) { | |
e89b591c | 3696 | if (ddsf & DDSF_NO_RESYNC) |
d0180171 | 3697 | drbd_info(device, "Resync of new storage suppressed with --assume-clean\n"); |
e89b591c | 3698 | else |
b30ab791 | 3699 | resync_after_online_grow(device); |
e89b591c | 3700 | } else |
b30ab791 | 3701 | set_bit(RESYNC_AFTER_NEG, &device->flags); |
b411b363 PR |
3702 | } |
3703 | } | |
3704 | ||
82bc0194 | 3705 | return 0; |
b411b363 PR |
3706 | } |
3707 | ||
bde89a9e | 3708 | static int receive_uuids(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 3709 | { |
9f4fe9ad | 3710 | struct drbd_peer_device *peer_device; |
b30ab791 | 3711 | struct drbd_device *device; |
e658983a | 3712 | struct p_uuids *p = pi->data; |
b411b363 | 3713 | u64 *p_uuid; |
62b0da3a | 3714 | int i, updated_uuids = 0; |
b411b363 | 3715 | |
9f4fe9ad AG |
3716 | peer_device = conn_peer_device(connection, pi->vnr); |
3717 | if (!peer_device) | |
bde89a9e | 3718 | return config_unknown_volume(connection, pi); |
9f4fe9ad | 3719 | device = peer_device->device; |
4a76b161 | 3720 | |
b411b363 | 3721 | p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO); |
063eacf8 | 3722 | if (!p_uuid) { |
d0180171 | 3723 | drbd_err(device, "kmalloc of p_uuid failed\n"); |
063eacf8 JW |
3724 | return false; |
3725 | } | |
b411b363 PR |
3726 | |
3727 | for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) | |
3728 | p_uuid[i] = be64_to_cpu(p->uuid[i]); | |
3729 | ||
b30ab791 AG |
3730 | kfree(device->p_uuid); |
3731 | device->p_uuid = p_uuid; | |
b411b363 | 3732 | |
b30ab791 AG |
3733 | if (device->state.conn < C_CONNECTED && |
3734 | device->state.disk < D_INCONSISTENT && | |
3735 | device->state.role == R_PRIMARY && | |
3736 | (device->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { | |
d0180171 | 3737 | drbd_err(device, "Can only connect to data with current UUID=%016llX\n", |
b30ab791 | 3738 | (unsigned long long)device->ed_uuid); |
9f4fe9ad | 3739 | conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 3740 | return -EIO; |
b411b363 PR |
3741 | } |
3742 | ||
b30ab791 | 3743 | if (get_ldev(device)) { |
b411b363 | 3744 | int skip_initial_sync = |
b30ab791 | 3745 | device->state.conn == C_CONNECTED && |
9f4fe9ad | 3746 | peer_device->connection->agreed_pro_version >= 90 && |
b30ab791 | 3747 | device->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && |
b411b363 PR |
3748 | (p_uuid[UI_FLAGS] & 8); |
3749 | if (skip_initial_sync) { | |
d0180171 | 3750 | drbd_info(device, "Accepted new current UUID, preparing to skip initial sync\n"); |
b30ab791 | 3751 | drbd_bitmap_io(device, &drbd_bmio_clear_n_write, |
20ceb2b2 LE |
3752 | "clear_n_write from receive_uuids", |
3753 | BM_LOCKED_TEST_ALLOWED); | |
b30ab791 AG |
3754 | _drbd_uuid_set(device, UI_CURRENT, p_uuid[UI_CURRENT]); |
3755 | _drbd_uuid_set(device, UI_BITMAP, 0); | |
3756 | _drbd_set_state(_NS2(device, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), | |
b411b363 | 3757 | CS_VERBOSE, NULL); |
b30ab791 | 3758 | drbd_md_sync(device); |
62b0da3a | 3759 | updated_uuids = 1; |
b411b363 | 3760 | } |
b30ab791 AG |
3761 | put_ldev(device); |
3762 | } else if (device->state.disk < D_INCONSISTENT && | |
3763 | device->state.role == R_PRIMARY) { | |
18a50fa2 PR |
3764 | /* I am a diskless primary, the peer just created a new current UUID |
3765 | for me. */ | |
b30ab791 | 3766 | updated_uuids = drbd_set_ed_uuid(device, p_uuid[UI_CURRENT]); |
b411b363 PR |
3767 | } |
3768 | ||
3769 | /* Before we test for the disk state, we should wait until an eventually | |
3770 | ongoing cluster wide state change is finished. That is important if | |
3771 | we are primary and are detaching from our disk. We need to see the | |
3772 | new disk state... */ | |
b30ab791 AG |
3773 | mutex_lock(device->state_mutex); |
3774 | mutex_unlock(device->state_mutex); | |
3775 | if (device->state.conn >= C_CONNECTED && device->state.disk < D_INCONSISTENT) | |
3776 | updated_uuids |= drbd_set_ed_uuid(device, p_uuid[UI_CURRENT]); | |
62b0da3a LE |
3777 | |
3778 | if (updated_uuids) | |
b30ab791 | 3779 | drbd_print_uuids(device, "receiver updated UUIDs to"); |
b411b363 | 3780 | |
82bc0194 | 3781 | return 0; |
b411b363 PR |
3782 | } |
3783 | ||
3784 | /** | |
3785 | * convert_state() - Converts the peer's view of the cluster state to our point of view | |
3786 | * @ps: The state as seen by the peer. | |
3787 | */ | |
3788 | static union drbd_state convert_state(union drbd_state ps) | |
3789 | { | |
3790 | union drbd_state ms; | |
3791 | ||
3792 | static enum drbd_conns c_tab[] = { | |
369bea63 | 3793 | [C_WF_REPORT_PARAMS] = C_WF_REPORT_PARAMS, |
b411b363 PR |
3794 | [C_CONNECTED] = C_CONNECTED, |
3795 | ||
3796 | [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, | |
3797 | [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, | |
3798 | [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ | |
3799 | [C_VERIFY_S] = C_VERIFY_T, | |
3800 | [C_MASK] = C_MASK, | |
3801 | }; | |
3802 | ||
3803 | ms.i = ps.i; | |
3804 | ||
3805 | ms.conn = c_tab[ps.conn]; | |
3806 | ms.peer = ps.role; | |
3807 | ms.role = ps.peer; | |
3808 | ms.pdsk = ps.disk; | |
3809 | ms.disk = ps.pdsk; | |
3810 | ms.peer_isp = (ps.aftr_isp | ps.user_isp); | |
3811 | ||
3812 | return ms; | |
3813 | } | |
3814 | ||
bde89a9e | 3815 | static int receive_req_state(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 3816 | { |
9f4fe9ad | 3817 | struct drbd_peer_device *peer_device; |
b30ab791 | 3818 | struct drbd_device *device; |
e658983a | 3819 | struct p_req_state *p = pi->data; |
b411b363 | 3820 | union drbd_state mask, val; |
bf885f8a | 3821 | enum drbd_state_rv rv; |
b411b363 | 3822 | |
9f4fe9ad AG |
3823 | peer_device = conn_peer_device(connection, pi->vnr); |
3824 | if (!peer_device) | |
4a76b161 | 3825 | return -EIO; |
9f4fe9ad | 3826 | device = peer_device->device; |
4a76b161 | 3827 | |
b411b363 PR |
3828 | mask.i = be32_to_cpu(p->mask); |
3829 | val.i = be32_to_cpu(p->val); | |
3830 | ||
9f4fe9ad | 3831 | if (test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags) && |
b30ab791 | 3832 | mutex_is_locked(device->state_mutex)) { |
69a22773 | 3833 | drbd_send_sr_reply(peer_device, SS_CONCURRENT_ST_CHG); |
82bc0194 | 3834 | return 0; |
b411b363 PR |
3835 | } |
3836 | ||
3837 | mask = convert_state(mask); | |
3838 | val = convert_state(val); | |
3839 | ||
b30ab791 | 3840 | rv = drbd_change_state(device, CS_VERBOSE, mask, val); |
69a22773 | 3841 | drbd_send_sr_reply(peer_device, rv); |
b411b363 | 3842 | |
b30ab791 | 3843 | drbd_md_sync(device); |
b411b363 | 3844 | |
82bc0194 | 3845 | return 0; |
b411b363 PR |
3846 | } |
3847 | ||
bde89a9e | 3848 | static int receive_req_conn_state(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 3849 | { |
e658983a | 3850 | struct p_req_state *p = pi->data; |
b411b363 | 3851 | union drbd_state mask, val; |
bf885f8a | 3852 | enum drbd_state_rv rv; |
b411b363 | 3853 | |
b411b363 PR |
3854 | mask.i = be32_to_cpu(p->mask); |
3855 | val.i = be32_to_cpu(p->val); | |
3856 | ||
bde89a9e AG |
3857 | if (test_bit(RESOLVE_CONFLICTS, &connection->flags) && |
3858 | mutex_is_locked(&connection->cstate_mutex)) { | |
3859 | conn_send_sr_reply(connection, SS_CONCURRENT_ST_CHG); | |
82bc0194 | 3860 | return 0; |
b411b363 PR |
3861 | } |
3862 | ||
3863 | mask = convert_state(mask); | |
3864 | val = convert_state(val); | |
3865 | ||
bde89a9e AG |
3866 | rv = conn_request_state(connection, mask, val, CS_VERBOSE | CS_LOCAL_ONLY | CS_IGN_OUTD_FAIL); |
3867 | conn_send_sr_reply(connection, rv); | |
b411b363 | 3868 | |
82bc0194 | 3869 | return 0; |
b411b363 PR |
3870 | } |
3871 | ||
bde89a9e | 3872 | static int receive_state(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 3873 | { |
9f4fe9ad | 3874 | struct drbd_peer_device *peer_device; |
b30ab791 | 3875 | struct drbd_device *device; |
e658983a | 3876 | struct p_state *p = pi->data; |
4ac4aada | 3877 | union drbd_state os, ns, peer_state; |
b411b363 | 3878 | enum drbd_disk_state real_peer_disk; |
65d922c3 | 3879 | enum chg_state_flags cs_flags; |
b411b363 PR |
3880 | int rv; |
3881 | ||
9f4fe9ad AG |
3882 | peer_device = conn_peer_device(connection, pi->vnr); |
3883 | if (!peer_device) | |
bde89a9e | 3884 | return config_unknown_volume(connection, pi); |
9f4fe9ad | 3885 | device = peer_device->device; |
4a76b161 | 3886 | |
b411b363 PR |
3887 | peer_state.i = be32_to_cpu(p->state); |
3888 | ||
3889 | real_peer_disk = peer_state.disk; | |
3890 | if (peer_state.disk == D_NEGOTIATING) { | |
b30ab791 | 3891 | real_peer_disk = device->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; |
d0180171 | 3892 | drbd_info(device, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); |
b411b363 PR |
3893 | } |
3894 | ||
0500813f | 3895 | spin_lock_irq(&device->resource->req_lock); |
b411b363 | 3896 | retry: |
b30ab791 | 3897 | os = ns = drbd_read_state(device); |
0500813f | 3898 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 | 3899 | |
545752d5 LE |
3900 | /* If some other part of the code (asender thread, timeout) |
3901 | * already decided to close the connection again, | |
3902 | * we must not "re-establish" it here. */ | |
3903 | if (os.conn <= C_TEAR_DOWN) | |
58ffa580 | 3904 | return -ECONNRESET; |
545752d5 | 3905 | |
40424e4a LE |
3906 | /* If this is the "end of sync" confirmation, usually the peer disk |
3907 | * transitions from D_INCONSISTENT to D_UP_TO_DATE. For empty (0 bits | |
3908 | * set) resync started in PausedSyncT, or if the timing of pause-/ | |
3909 | * unpause-sync events has been "just right", the peer disk may | |
3910 | * transition from D_CONSISTENT to D_UP_TO_DATE as well. | |
3911 | */ | |
3912 | if ((os.pdsk == D_INCONSISTENT || os.pdsk == D_CONSISTENT) && | |
3913 | real_peer_disk == D_UP_TO_DATE && | |
e9ef7bb6 LE |
3914 | os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { |
3915 | /* If we are (becoming) SyncSource, but peer is still in sync | |
3916 | * preparation, ignore its uptodate-ness to avoid flapping, it | |
3917 | * will change to inconsistent once the peer reaches active | |
3918 | * syncing states. | |
3919 | * It may have changed syncer-paused flags, however, so we | |
3920 | * cannot ignore this completely. */ | |
3921 | if (peer_state.conn > C_CONNECTED && | |
3922 | peer_state.conn < C_SYNC_SOURCE) | |
3923 | real_peer_disk = D_INCONSISTENT; | |
3924 | ||
3925 | /* if peer_state changes to connected at the same time, | |
3926 | * it explicitly notifies us that it finished resync. | |
3927 | * Maybe we should finish it up, too? */ | |
3928 | else if (os.conn >= C_SYNC_SOURCE && | |
3929 | peer_state.conn == C_CONNECTED) { | |
b30ab791 AG |
3930 | if (drbd_bm_total_weight(device) <= device->rs_failed) |
3931 | drbd_resync_finished(device); | |
82bc0194 | 3932 | return 0; |
e9ef7bb6 LE |
3933 | } |
3934 | } | |
3935 | ||
02b91b55 LE |
3936 | /* explicit verify finished notification, stop sector reached. */ |
3937 | if (os.conn == C_VERIFY_T && os.disk == D_UP_TO_DATE && | |
3938 | peer_state.conn == C_CONNECTED && real_peer_disk == D_UP_TO_DATE) { | |
b30ab791 AG |
3939 | ov_out_of_sync_print(device); |
3940 | drbd_resync_finished(device); | |
58ffa580 | 3941 | return 0; |
02b91b55 LE |
3942 | } |
3943 | ||
e9ef7bb6 LE |
3944 | /* peer says his disk is inconsistent, while we think it is uptodate, |
3945 | * and this happens while the peer still thinks we have a sync going on, | |
3946 | * but we think we are already done with the sync. | |
3947 | * We ignore this to avoid flapping pdsk. | |
3948 | * This should not happen, if the peer is a recent version of drbd. */ | |
3949 | if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && | |
3950 | os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) | |
3951 | real_peer_disk = D_UP_TO_DATE; | |
3952 | ||
4ac4aada LE |
3953 | if (ns.conn == C_WF_REPORT_PARAMS) |
3954 | ns.conn = C_CONNECTED; | |
b411b363 | 3955 | |
67531718 PR |
3956 | if (peer_state.conn == C_AHEAD) |
3957 | ns.conn = C_BEHIND; | |
3958 | ||
b30ab791 AG |
3959 | if (device->p_uuid && peer_state.disk >= D_NEGOTIATING && |
3960 | get_ldev_if_state(device, D_NEGOTIATING)) { | |
b411b363 PR |
3961 | int cr; /* consider resync */ |
3962 | ||
3963 | /* if we established a new connection */ | |
4ac4aada | 3964 | cr = (os.conn < C_CONNECTED); |
b411b363 PR |
3965 | /* if we had an established connection |
3966 | * and one of the nodes newly attaches a disk */ | |
4ac4aada | 3967 | cr |= (os.conn == C_CONNECTED && |
b411b363 | 3968 | (peer_state.disk == D_NEGOTIATING || |
4ac4aada | 3969 | os.disk == D_NEGOTIATING)); |
b411b363 PR |
3970 | /* if we have both been inconsistent, and the peer has been |
3971 | * forced to be UpToDate with --overwrite-data */ | |
b30ab791 | 3972 | cr |= test_bit(CONSIDER_RESYNC, &device->flags); |
b411b363 PR |
3973 | /* if we had been plain connected, and the admin requested to |
3974 | * start a sync by "invalidate" or "invalidate-remote" */ | |
4ac4aada | 3975 | cr |= (os.conn == C_CONNECTED && |
b411b363 PR |
3976 | (peer_state.conn >= C_STARTING_SYNC_S && |
3977 | peer_state.conn <= C_WF_BITMAP_T)); | |
3978 | ||
3979 | if (cr) | |
69a22773 | 3980 | ns.conn = drbd_sync_handshake(peer_device, peer_state.role, real_peer_disk); |
b411b363 | 3981 | |
b30ab791 | 3982 | put_ldev(device); |
4ac4aada LE |
3983 | if (ns.conn == C_MASK) { |
3984 | ns.conn = C_CONNECTED; | |
b30ab791 AG |
3985 | if (device->state.disk == D_NEGOTIATING) { |
3986 | drbd_force_state(device, NS(disk, D_FAILED)); | |
b411b363 | 3987 | } else if (peer_state.disk == D_NEGOTIATING) { |
d0180171 | 3988 | drbd_err(device, "Disk attach process on the peer node was aborted.\n"); |
b411b363 | 3989 | peer_state.disk = D_DISKLESS; |
580b9767 | 3990 | real_peer_disk = D_DISKLESS; |
b411b363 | 3991 | } else { |
9f4fe9ad | 3992 | if (test_and_clear_bit(CONN_DRY_RUN, &peer_device->connection->flags)) |
82bc0194 | 3993 | return -EIO; |
0b0ba1ef | 3994 | D_ASSERT(device, os.conn == C_WF_REPORT_PARAMS); |
9f4fe9ad | 3995 | conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 3996 | return -EIO; |
b411b363 PR |
3997 | } |
3998 | } | |
3999 | } | |
4000 | ||
0500813f | 4001 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 | 4002 | if (os.i != drbd_read_state(device).i) |
b411b363 | 4003 | goto retry; |
b30ab791 | 4004 | clear_bit(CONSIDER_RESYNC, &device->flags); |
b411b363 PR |
4005 | ns.peer = peer_state.role; |
4006 | ns.pdsk = real_peer_disk; | |
4007 | ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); | |
4ac4aada | 4008 | if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) |
b30ab791 | 4009 | ns.disk = device->new_state_tmp.disk; |
4ac4aada | 4010 | cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); |
b30ab791 AG |
4011 | if (ns.pdsk == D_CONSISTENT && drbd_suspended(device) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && |
4012 | test_bit(NEW_CUR_UUID, &device->flags)) { | |
8554df1c | 4013 | /* Do not allow tl_restart(RESEND) for a rebooted peer. We can only allow this |
481c6f50 | 4014 | for temporal network outages! */ |
0500813f | 4015 | spin_unlock_irq(&device->resource->req_lock); |
d0180171 | 4016 | drbd_err(device, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); |
9f4fe9ad | 4017 | tl_clear(peer_device->connection); |
b30ab791 AG |
4018 | drbd_uuid_new_current(device); |
4019 | clear_bit(NEW_CUR_UUID, &device->flags); | |
9f4fe9ad | 4020 | conn_request_state(peer_device->connection, NS2(conn, C_PROTOCOL_ERROR, susp, 0), CS_HARD); |
82bc0194 | 4021 | return -EIO; |
481c6f50 | 4022 | } |
b30ab791 AG |
4023 | rv = _drbd_set_state(device, ns, cs_flags, NULL); |
4024 | ns = drbd_read_state(device); | |
0500813f | 4025 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 PR |
4026 | |
4027 | if (rv < SS_SUCCESS) { | |
9f4fe9ad | 4028 | conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 4029 | return -EIO; |
b411b363 PR |
4030 | } |
4031 | ||
4ac4aada LE |
4032 | if (os.conn > C_WF_REPORT_PARAMS) { |
4033 | if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED && | |
b411b363 PR |
4034 | peer_state.disk != D_NEGOTIATING ) { |
4035 | /* we want resync, peer has not yet decided to sync... */ | |
4036 | /* Nowadays only used when forcing a node into primary role and | |
4037 | setting its disk to UpToDate with that */ | |
69a22773 AG |
4038 | drbd_send_uuids(peer_device); |
4039 | drbd_send_current_state(peer_device); | |
b411b363 PR |
4040 | } |
4041 | } | |
4042 | ||
b30ab791 | 4043 | clear_bit(DISCARD_MY_DATA, &device->flags); |
b411b363 | 4044 | |
b30ab791 | 4045 | drbd_md_sync(device); /* update connected indicator, la_size_sect, ... */ |
b411b363 | 4046 | |
82bc0194 | 4047 | return 0; |
b411b363 PR |
4048 | } |
4049 | ||
bde89a9e | 4050 | static int receive_sync_uuid(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 4051 | { |
9f4fe9ad | 4052 | struct drbd_peer_device *peer_device; |
b30ab791 | 4053 | struct drbd_device *device; |
e658983a | 4054 | struct p_rs_uuid *p = pi->data; |
4a76b161 | 4055 | |
9f4fe9ad AG |
4056 | peer_device = conn_peer_device(connection, pi->vnr); |
4057 | if (!peer_device) | |
4a76b161 | 4058 | return -EIO; |
9f4fe9ad | 4059 | device = peer_device->device; |
b411b363 | 4060 | |
b30ab791 AG |
4061 | wait_event(device->misc_wait, |
4062 | device->state.conn == C_WF_SYNC_UUID || | |
4063 | device->state.conn == C_BEHIND || | |
4064 | device->state.conn < C_CONNECTED || | |
4065 | device->state.disk < D_NEGOTIATING); | |
b411b363 | 4066 | |
0b0ba1ef | 4067 | /* D_ASSERT(device, device->state.conn == C_WF_SYNC_UUID ); */ |
b411b363 | 4068 | |
b411b363 PR |
4069 | /* Here the _drbd_uuid_ functions are right, current should |
4070 | _not_ be rotated into the history */ | |
b30ab791 AG |
4071 | if (get_ldev_if_state(device, D_NEGOTIATING)) { |
4072 | _drbd_uuid_set(device, UI_CURRENT, be64_to_cpu(p->uuid)); | |
4073 | _drbd_uuid_set(device, UI_BITMAP, 0UL); | |
b411b363 | 4074 | |
b30ab791 AG |
4075 | drbd_print_uuids(device, "updated sync uuid"); |
4076 | drbd_start_resync(device, C_SYNC_TARGET); | |
b411b363 | 4077 | |
b30ab791 | 4078 | put_ldev(device); |
b411b363 | 4079 | } else |
d0180171 | 4080 | drbd_err(device, "Ignoring SyncUUID packet!\n"); |
b411b363 | 4081 | |
82bc0194 | 4082 | return 0; |
b411b363 PR |
4083 | } |
4084 | ||
2c46407d AG |
4085 | /** |
4086 | * receive_bitmap_plain | |
4087 | * | |
4088 | * Return 0 when done, 1 when another iteration is needed, and a negative error | |
4089 | * code upon failure. | |
4090 | */ | |
4091 | static int | |
69a22773 | 4092 | receive_bitmap_plain(struct drbd_peer_device *peer_device, unsigned int size, |
e658983a | 4093 | unsigned long *p, struct bm_xfer_ctx *c) |
b411b363 | 4094 | { |
50d0b1ad | 4095 | unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - |
69a22773 | 4096 | drbd_header_size(peer_device->connection); |
e658983a | 4097 | unsigned int num_words = min_t(size_t, data_size / sizeof(*p), |
50d0b1ad | 4098 | c->bm_words - c->word_offset); |
e658983a | 4099 | unsigned int want = num_words * sizeof(*p); |
2c46407d | 4100 | int err; |
b411b363 | 4101 | |
50d0b1ad | 4102 | if (want != size) { |
69a22773 | 4103 | drbd_err(peer_device, "%s:want (%u) != size (%u)\n", __func__, want, size); |
2c46407d | 4104 | return -EIO; |
b411b363 PR |
4105 | } |
4106 | if (want == 0) | |
2c46407d | 4107 | return 0; |
69a22773 | 4108 | err = drbd_recv_all(peer_device->connection, p, want); |
82bc0194 | 4109 | if (err) |
2c46407d | 4110 | return err; |
b411b363 | 4111 | |
69a22773 | 4112 | drbd_bm_merge_lel(peer_device->device, c->word_offset, num_words, p); |
b411b363 PR |
4113 | |
4114 | c->word_offset += num_words; | |
4115 | c->bit_offset = c->word_offset * BITS_PER_LONG; | |
4116 | if (c->bit_offset > c->bm_bits) | |
4117 | c->bit_offset = c->bm_bits; | |
4118 | ||
2c46407d | 4119 | return 1; |
b411b363 PR |
4120 | } |
4121 | ||
a02d1240 AG |
4122 | static enum drbd_bitmap_code dcbp_get_code(struct p_compressed_bm *p) |
4123 | { | |
4124 | return (enum drbd_bitmap_code)(p->encoding & 0x0f); | |
4125 | } | |
4126 | ||
4127 | static int dcbp_get_start(struct p_compressed_bm *p) | |
4128 | { | |
4129 | return (p->encoding & 0x80) != 0; | |
4130 | } | |
4131 | ||
4132 | static int dcbp_get_pad_bits(struct p_compressed_bm *p) | |
4133 | { | |
4134 | return (p->encoding >> 4) & 0x7; | |
4135 | } | |
4136 | ||
2c46407d AG |
4137 | /** |
4138 | * recv_bm_rle_bits | |
4139 | * | |
4140 | * Return 0 when done, 1 when another iteration is needed, and a negative error | |
4141 | * code upon failure. | |
4142 | */ | |
4143 | static int | |
69a22773 | 4144 | recv_bm_rle_bits(struct drbd_peer_device *peer_device, |
b411b363 | 4145 | struct p_compressed_bm *p, |
c6d25cfe PR |
4146 | struct bm_xfer_ctx *c, |
4147 | unsigned int len) | |
b411b363 PR |
4148 | { |
4149 | struct bitstream bs; | |
4150 | u64 look_ahead; | |
4151 | u64 rl; | |
4152 | u64 tmp; | |
4153 | unsigned long s = c->bit_offset; | |
4154 | unsigned long e; | |
a02d1240 | 4155 | int toggle = dcbp_get_start(p); |
b411b363 PR |
4156 | int have; |
4157 | int bits; | |
4158 | ||
a02d1240 | 4159 | bitstream_init(&bs, p->code, len, dcbp_get_pad_bits(p)); |
b411b363 PR |
4160 | |
4161 | bits = bitstream_get_bits(&bs, &look_ahead, 64); | |
4162 | if (bits < 0) | |
2c46407d | 4163 | return -EIO; |
b411b363 PR |
4164 | |
4165 | for (have = bits; have > 0; s += rl, toggle = !toggle) { | |
4166 | bits = vli_decode_bits(&rl, look_ahead); | |
4167 | if (bits <= 0) | |
2c46407d | 4168 | return -EIO; |
b411b363 PR |
4169 | |
4170 | if (toggle) { | |
4171 | e = s + rl -1; | |
4172 | if (e >= c->bm_bits) { | |
69a22773 | 4173 | drbd_err(peer_device, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); |
2c46407d | 4174 | return -EIO; |
b411b363 | 4175 | } |
69a22773 | 4176 | _drbd_bm_set_bits(peer_device->device, s, e); |
b411b363 PR |
4177 | } |
4178 | ||
4179 | if (have < bits) { | |
69a22773 | 4180 | drbd_err(peer_device, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", |
b411b363 PR |
4181 | have, bits, look_ahead, |
4182 | (unsigned int)(bs.cur.b - p->code), | |
4183 | (unsigned int)bs.buf_len); | |
2c46407d | 4184 | return -EIO; |
b411b363 | 4185 | } |
d2da5b0c LE |
4186 | /* if we consumed all 64 bits, assign 0; >> 64 is "undefined"; */ |
4187 | if (likely(bits < 64)) | |
4188 | look_ahead >>= bits; | |
4189 | else | |
4190 | look_ahead = 0; | |
b411b363 PR |
4191 | have -= bits; |
4192 | ||
4193 | bits = bitstream_get_bits(&bs, &tmp, 64 - have); | |
4194 | if (bits < 0) | |
2c46407d | 4195 | return -EIO; |
b411b363 PR |
4196 | look_ahead |= tmp << have; |
4197 | have += bits; | |
4198 | } | |
4199 | ||
4200 | c->bit_offset = s; | |
4201 | bm_xfer_ctx_bit_to_word_offset(c); | |
4202 | ||
2c46407d | 4203 | return (s != c->bm_bits); |
b411b363 PR |
4204 | } |
4205 | ||
2c46407d AG |
4206 | /** |
4207 | * decode_bitmap_c | |
4208 | * | |
4209 | * Return 0 when done, 1 when another iteration is needed, and a negative error | |
4210 | * code upon failure. | |
4211 | */ | |
4212 | static int | |
69a22773 | 4213 | decode_bitmap_c(struct drbd_peer_device *peer_device, |
b411b363 | 4214 | struct p_compressed_bm *p, |
c6d25cfe PR |
4215 | struct bm_xfer_ctx *c, |
4216 | unsigned int len) | |
b411b363 | 4217 | { |
a02d1240 | 4218 | if (dcbp_get_code(p) == RLE_VLI_Bits) |
69a22773 | 4219 | return recv_bm_rle_bits(peer_device, p, c, len - sizeof(*p)); |
b411b363 PR |
4220 | |
4221 | /* other variants had been implemented for evaluation, | |
4222 | * but have been dropped as this one turned out to be "best" | |
4223 | * during all our tests. */ | |
4224 | ||
69a22773 AG |
4225 | drbd_err(peer_device, "receive_bitmap_c: unknown encoding %u\n", p->encoding); |
4226 | conn_request_state(peer_device->connection, NS(conn, C_PROTOCOL_ERROR), CS_HARD); | |
2c46407d | 4227 | return -EIO; |
b411b363 PR |
4228 | } |
4229 | ||
b30ab791 | 4230 | void INFO_bm_xfer_stats(struct drbd_device *device, |
b411b363 PR |
4231 | const char *direction, struct bm_xfer_ctx *c) |
4232 | { | |
4233 | /* what would it take to transfer it "plaintext" */ | |
a6b32bc3 | 4234 | unsigned int header_size = drbd_header_size(first_peer_device(device)->connection); |
50d0b1ad AG |
4235 | unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - header_size; |
4236 | unsigned int plain = | |
4237 | header_size * (DIV_ROUND_UP(c->bm_words, data_size) + 1) + | |
4238 | c->bm_words * sizeof(unsigned long); | |
4239 | unsigned int total = c->bytes[0] + c->bytes[1]; | |
4240 | unsigned int r; | |
b411b363 PR |
4241 | |
4242 | /* total can not be zero. but just in case: */ | |
4243 | if (total == 0) | |
4244 | return; | |
4245 | ||
4246 | /* don't report if not compressed */ | |
4247 | if (total >= plain) | |
4248 | return; | |
4249 | ||
4250 | /* total < plain. check for overflow, still */ | |
4251 | r = (total > UINT_MAX/1000) ? (total / (plain/1000)) | |
4252 | : (1000 * total / plain); | |
4253 | ||
4254 | if (r > 1000) | |
4255 | r = 1000; | |
4256 | ||
4257 | r = 1000 - r; | |
d0180171 | 4258 | drbd_info(device, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " |
b411b363 PR |
4259 | "total %u; compression: %u.%u%%\n", |
4260 | direction, | |
4261 | c->bytes[1], c->packets[1], | |
4262 | c->bytes[0], c->packets[0], | |
4263 | total, r/10, r % 10); | |
4264 | } | |
4265 | ||
4266 | /* Since we are processing the bitfield from lower addresses to higher, | |
4267 | it does not matter if the process it in 32 bit chunks or 64 bit | |
4268 | chunks as long as it is little endian. (Understand it as byte stream, | |
4269 | beginning with the lowest byte...) If we would use big endian | |
4270 | we would need to process it from the highest address to the lowest, | |
4271 | in order to be agnostic to the 32 vs 64 bits issue. | |
4272 | ||
4273 | returns 0 on failure, 1 if we successfully received it. */ | |
bde89a9e | 4274 | static int receive_bitmap(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 4275 | { |
9f4fe9ad | 4276 | struct drbd_peer_device *peer_device; |
b30ab791 | 4277 | struct drbd_device *device; |
b411b363 | 4278 | struct bm_xfer_ctx c; |
2c46407d | 4279 | int err; |
4a76b161 | 4280 | |
9f4fe9ad AG |
4281 | peer_device = conn_peer_device(connection, pi->vnr); |
4282 | if (!peer_device) | |
4a76b161 | 4283 | return -EIO; |
9f4fe9ad | 4284 | device = peer_device->device; |
b411b363 | 4285 | |
b30ab791 | 4286 | drbd_bm_lock(device, "receive bitmap", BM_LOCKED_SET_ALLOWED); |
20ceb2b2 LE |
4287 | /* you are supposed to send additional out-of-sync information |
4288 | * if you actually set bits during this phase */ | |
b411b363 | 4289 | |
b411b363 | 4290 | c = (struct bm_xfer_ctx) { |
b30ab791 AG |
4291 | .bm_bits = drbd_bm_bits(device), |
4292 | .bm_words = drbd_bm_words(device), | |
b411b363 PR |
4293 | }; |
4294 | ||
2c46407d | 4295 | for(;;) { |
e658983a | 4296 | if (pi->cmd == P_BITMAP) |
69a22773 | 4297 | err = receive_bitmap_plain(peer_device, pi->size, pi->data, &c); |
e658983a | 4298 | else if (pi->cmd == P_COMPRESSED_BITMAP) { |
b411b363 PR |
4299 | /* MAYBE: sanity check that we speak proto >= 90, |
4300 | * and the feature is enabled! */ | |
e658983a | 4301 | struct p_compressed_bm *p = pi->data; |
b411b363 | 4302 | |
bde89a9e | 4303 | if (pi->size > DRBD_SOCKET_BUFFER_SIZE - drbd_header_size(connection)) { |
d0180171 | 4304 | drbd_err(device, "ReportCBitmap packet too large\n"); |
82bc0194 | 4305 | err = -EIO; |
b411b363 PR |
4306 | goto out; |
4307 | } | |
e658983a | 4308 | if (pi->size <= sizeof(*p)) { |
d0180171 | 4309 | drbd_err(device, "ReportCBitmap packet too small (l:%u)\n", pi->size); |
82bc0194 | 4310 | err = -EIO; |
78fcbdae | 4311 | goto out; |
b411b363 | 4312 | } |
9f4fe9ad | 4313 | err = drbd_recv_all(peer_device->connection, p, pi->size); |
e658983a AG |
4314 | if (err) |
4315 | goto out; | |
69a22773 | 4316 | err = decode_bitmap_c(peer_device, p, &c, pi->size); |
b411b363 | 4317 | } else { |
d0180171 | 4318 | drbd_warn(device, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", pi->cmd); |
82bc0194 | 4319 | err = -EIO; |
b411b363 PR |
4320 | goto out; |
4321 | } | |
4322 | ||
e2857216 | 4323 | c.packets[pi->cmd == P_BITMAP]++; |
bde89a9e | 4324 | c.bytes[pi->cmd == P_BITMAP] += drbd_header_size(connection) + pi->size; |
b411b363 | 4325 | |
2c46407d AG |
4326 | if (err <= 0) { |
4327 | if (err < 0) | |
4328 | goto out; | |
b411b363 | 4329 | break; |
2c46407d | 4330 | } |
9f4fe9ad | 4331 | err = drbd_recv_header(peer_device->connection, pi); |
82bc0194 | 4332 | if (err) |
b411b363 | 4333 | goto out; |
2c46407d | 4334 | } |
b411b363 | 4335 | |
b30ab791 | 4336 | INFO_bm_xfer_stats(device, "receive", &c); |
b411b363 | 4337 | |
b30ab791 | 4338 | if (device->state.conn == C_WF_BITMAP_T) { |
de1f8e4a AG |
4339 | enum drbd_state_rv rv; |
4340 | ||
b30ab791 | 4341 | err = drbd_send_bitmap(device); |
82bc0194 | 4342 | if (err) |
b411b363 PR |
4343 | goto out; |
4344 | /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ | |
b30ab791 | 4345 | rv = _drbd_request_state(device, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); |
0b0ba1ef | 4346 | D_ASSERT(device, rv == SS_SUCCESS); |
b30ab791 | 4347 | } else if (device->state.conn != C_WF_BITMAP_S) { |
b411b363 PR |
4348 | /* admin may have requested C_DISCONNECTING, |
4349 | * other threads may have noticed network errors */ | |
d0180171 | 4350 | drbd_info(device, "unexpected cstate (%s) in receive_bitmap\n", |
b30ab791 | 4351 | drbd_conn_str(device->state.conn)); |
b411b363 | 4352 | } |
82bc0194 | 4353 | err = 0; |
b411b363 | 4354 | |
b411b363 | 4355 | out: |
b30ab791 AG |
4356 | drbd_bm_unlock(device); |
4357 | if (!err && device->state.conn == C_WF_BITMAP_S) | |
4358 | drbd_start_resync(device, C_SYNC_SOURCE); | |
82bc0194 | 4359 | return err; |
b411b363 PR |
4360 | } |
4361 | ||
bde89a9e | 4362 | static int receive_skip(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 4363 | { |
1ec861eb | 4364 | drbd_warn(connection, "skipping unknown optional packet type %d, l: %d!\n", |
e2857216 | 4365 | pi->cmd, pi->size); |
b411b363 | 4366 | |
bde89a9e | 4367 | return ignore_remaining_packet(connection, pi); |
b411b363 PR |
4368 | } |
4369 | ||
bde89a9e | 4370 | static int receive_UnplugRemote(struct drbd_connection *connection, struct packet_info *pi) |
0ced55a3 | 4371 | { |
e7f52dfb LE |
4372 | /* Make sure we've acked all the TCP data associated |
4373 | * with the data requests being unplugged */ | |
bde89a9e | 4374 | drbd_tcp_quickack(connection->data.socket); |
0ced55a3 | 4375 | |
82bc0194 | 4376 | return 0; |
0ced55a3 PR |
4377 | } |
4378 | ||
bde89a9e | 4379 | static int receive_out_of_sync(struct drbd_connection *connection, struct packet_info *pi) |
73a01a18 | 4380 | { |
9f4fe9ad | 4381 | struct drbd_peer_device *peer_device; |
b30ab791 | 4382 | struct drbd_device *device; |
e658983a | 4383 | struct p_block_desc *p = pi->data; |
4a76b161 | 4384 | |
9f4fe9ad AG |
4385 | peer_device = conn_peer_device(connection, pi->vnr); |
4386 | if (!peer_device) | |
4a76b161 | 4387 | return -EIO; |
9f4fe9ad | 4388 | device = peer_device->device; |
73a01a18 | 4389 | |
b30ab791 | 4390 | switch (device->state.conn) { |
f735e363 LE |
4391 | case C_WF_SYNC_UUID: |
4392 | case C_WF_BITMAP_T: | |
4393 | case C_BEHIND: | |
4394 | break; | |
4395 | default: | |
d0180171 | 4396 | drbd_err(device, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n", |
b30ab791 | 4397 | drbd_conn_str(device->state.conn)); |
f735e363 LE |
4398 | } |
4399 | ||
b30ab791 | 4400 | drbd_set_out_of_sync(device, be64_to_cpu(p->sector), be32_to_cpu(p->blksize)); |
73a01a18 | 4401 | |
82bc0194 | 4402 | return 0; |
73a01a18 PR |
4403 | } |
4404 | ||
02918be2 PR |
4405 | struct data_cmd { |
4406 | int expect_payload; | |
4407 | size_t pkt_size; | |
bde89a9e | 4408 | int (*fn)(struct drbd_connection *, struct packet_info *); |
02918be2 PR |
4409 | }; |
4410 | ||
4411 | static struct data_cmd drbd_cmd_handler[] = { | |
4412 | [P_DATA] = { 1, sizeof(struct p_data), receive_Data }, | |
4413 | [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply }, | |
4414 | [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } , | |
4415 | [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } , | |
e658983a AG |
4416 | [P_BITMAP] = { 1, 0, receive_bitmap } , |
4417 | [P_COMPRESSED_BITMAP] = { 1, 0, receive_bitmap } , | |
4418 | [P_UNPLUG_REMOTE] = { 0, 0, receive_UnplugRemote }, | |
02918be2 PR |
4419 | [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, |
4420 | [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, | |
e658983a AG |
4421 | [P_SYNC_PARAM] = { 1, 0, receive_SyncParam }, |
4422 | [P_SYNC_PARAM89] = { 1, 0, receive_SyncParam }, | |
02918be2 PR |
4423 | [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol }, |
4424 | [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids }, | |
4425 | [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes }, | |
4426 | [P_STATE] = { 0, sizeof(struct p_state), receive_state }, | |
4427 | [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state }, | |
4428 | [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid }, | |
4429 | [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, | |
4430 | [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest }, | |
4431 | [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest }, | |
4432 | [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip }, | |
73a01a18 | 4433 | [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync }, |
4a76b161 | 4434 | [P_CONN_ST_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_conn_state }, |
036b17ea | 4435 | [P_PROTOCOL_UPDATE] = { 1, sizeof(struct p_protocol), receive_protocol }, |
b411b363 PR |
4436 | }; |
4437 | ||
bde89a9e | 4438 | static void drbdd(struct drbd_connection *connection) |
b411b363 | 4439 | { |
77351055 | 4440 | struct packet_info pi; |
02918be2 | 4441 | size_t shs; /* sub header size */ |
82bc0194 | 4442 | int err; |
b411b363 | 4443 | |
bde89a9e | 4444 | while (get_t_state(&connection->receiver) == RUNNING) { |
deebe195 | 4445 | struct data_cmd *cmd; |
b411b363 | 4446 | |
bde89a9e AG |
4447 | drbd_thread_current_set_cpu(&connection->receiver); |
4448 | if (drbd_recv_header(connection, &pi)) | |
02918be2 | 4449 | goto err_out; |
b411b363 | 4450 | |
deebe195 | 4451 | cmd = &drbd_cmd_handler[pi.cmd]; |
4a76b161 | 4452 | if (unlikely(pi.cmd >= ARRAY_SIZE(drbd_cmd_handler) || !cmd->fn)) { |
1ec861eb | 4453 | drbd_err(connection, "Unexpected data packet %s (0x%04x)", |
2fcb8f30 | 4454 | cmdname(pi.cmd), pi.cmd); |
02918be2 | 4455 | goto err_out; |
0b33a916 | 4456 | } |
b411b363 | 4457 | |
e658983a AG |
4458 | shs = cmd->pkt_size; |
4459 | if (pi.size > shs && !cmd->expect_payload) { | |
1ec861eb | 4460 | drbd_err(connection, "No payload expected %s l:%d\n", |
2fcb8f30 | 4461 | cmdname(pi.cmd), pi.size); |
02918be2 | 4462 | goto err_out; |
b411b363 | 4463 | } |
b411b363 | 4464 | |
c13f7e1a | 4465 | if (shs) { |
bde89a9e | 4466 | err = drbd_recv_all_warn(connection, pi.data, shs); |
a5c31904 | 4467 | if (err) |
c13f7e1a | 4468 | goto err_out; |
e2857216 | 4469 | pi.size -= shs; |
c13f7e1a LE |
4470 | } |
4471 | ||
bde89a9e | 4472 | err = cmd->fn(connection, &pi); |
4a76b161 | 4473 | if (err) { |
1ec861eb | 4474 | drbd_err(connection, "error receiving %s, e: %d l: %d!\n", |
9f5bdc33 | 4475 | cmdname(pi.cmd), err, pi.size); |
02918be2 | 4476 | goto err_out; |
b411b363 PR |
4477 | } |
4478 | } | |
82bc0194 | 4479 | return; |
b411b363 | 4480 | |
82bc0194 | 4481 | err_out: |
bde89a9e | 4482 | conn_request_state(connection, NS(conn, C_PROTOCOL_ERROR), CS_HARD); |
b411b363 PR |
4483 | } |
4484 | ||
bde89a9e | 4485 | void conn_flush_workqueue(struct drbd_connection *connection) |
b411b363 PR |
4486 | { |
4487 | struct drbd_wq_barrier barr; | |
4488 | ||
4489 | barr.w.cb = w_prev_work_done; | |
bde89a9e | 4490 | barr.w.connection = connection; |
b411b363 | 4491 | init_completion(&barr.done); |
bde89a9e | 4492 | drbd_queue_work(&connection->sender_work, &barr.w); |
b411b363 PR |
4493 | wait_for_completion(&barr.done); |
4494 | } | |
4495 | ||
bde89a9e | 4496 | static void conn_disconnect(struct drbd_connection *connection) |
b411b363 | 4497 | { |
c06ece6b | 4498 | struct drbd_peer_device *peer_device; |
bbeb641c | 4499 | enum drbd_conns oc; |
376694a0 | 4500 | int vnr; |
b411b363 | 4501 | |
bde89a9e | 4502 | if (connection->cstate == C_STANDALONE) |
b411b363 | 4503 | return; |
b411b363 | 4504 | |
545752d5 LE |
4505 | /* We are about to start the cleanup after connection loss. |
4506 | * Make sure drbd_make_request knows about that. | |
4507 | * Usually we should be in some network failure state already, | |
4508 | * but just in case we are not, we fix it up here. | |
4509 | */ | |
bde89a9e | 4510 | conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD); |
545752d5 | 4511 | |
b411b363 | 4512 | /* asender does not clean up anything. it must not interfere, either */ |
bde89a9e AG |
4513 | drbd_thread_stop(&connection->asender); |
4514 | drbd_free_sock(connection); | |
360cc740 | 4515 | |
c141ebda | 4516 | rcu_read_lock(); |
c06ece6b AG |
4517 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
4518 | struct drbd_device *device = peer_device->device; | |
b30ab791 | 4519 | kref_get(&device->kref); |
c141ebda | 4520 | rcu_read_unlock(); |
69a22773 | 4521 | drbd_disconnected(peer_device); |
c06ece6b | 4522 | kref_put(&device->kref, drbd_destroy_device); |
c141ebda PR |
4523 | rcu_read_lock(); |
4524 | } | |
4525 | rcu_read_unlock(); | |
4526 | ||
bde89a9e | 4527 | if (!list_empty(&connection->current_epoch->list)) |
1ec861eb | 4528 | drbd_err(connection, "ASSERTION FAILED: connection->current_epoch->list not empty\n"); |
12038a3a | 4529 | /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ |
bde89a9e AG |
4530 | atomic_set(&connection->current_epoch->epoch_size, 0); |
4531 | connection->send.seen_any_write_yet = false; | |
12038a3a | 4532 | |
1ec861eb | 4533 | drbd_info(connection, "Connection closed\n"); |
360cc740 | 4534 | |
bde89a9e AG |
4535 | if (conn_highest_role(connection) == R_PRIMARY && conn_highest_pdsk(connection) >= D_UNKNOWN) |
4536 | conn_try_outdate_peer_async(connection); | |
cb703454 | 4537 | |
0500813f | 4538 | spin_lock_irq(&connection->resource->req_lock); |
bde89a9e | 4539 | oc = connection->cstate; |
bbeb641c | 4540 | if (oc >= C_UNCONNECTED) |
bde89a9e | 4541 | _conn_request_state(connection, NS(conn, C_UNCONNECTED), CS_VERBOSE); |
bbeb641c | 4542 | |
0500813f | 4543 | spin_unlock_irq(&connection->resource->req_lock); |
360cc740 | 4544 | |
f3dfa40a | 4545 | if (oc == C_DISCONNECTING) |
bde89a9e | 4546 | conn_request_state(connection, NS(conn, C_STANDALONE), CS_VERBOSE | CS_HARD); |
360cc740 PR |
4547 | } |
4548 | ||
69a22773 | 4549 | static int drbd_disconnected(struct drbd_peer_device *peer_device) |
360cc740 | 4550 | { |
69a22773 | 4551 | struct drbd_device *device = peer_device->device; |
360cc740 | 4552 | unsigned int i; |
b411b363 | 4553 | |
85719573 | 4554 | /* wait for current activity to cease. */ |
0500813f | 4555 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 AG |
4556 | _drbd_wait_ee_list_empty(device, &device->active_ee); |
4557 | _drbd_wait_ee_list_empty(device, &device->sync_ee); | |
4558 | _drbd_wait_ee_list_empty(device, &device->read_ee); | |
0500813f | 4559 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 PR |
4560 | |
4561 | /* We do not have data structures that would allow us to | |
4562 | * get the rs_pending_cnt down to 0 again. | |
4563 | * * On C_SYNC_TARGET we do not have any data structures describing | |
4564 | * the pending RSDataRequest's we have sent. | |
4565 | * * On C_SYNC_SOURCE there is no data structure that tracks | |
4566 | * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. | |
4567 | * And no, it is not the sum of the reference counts in the | |
4568 | * resync_LRU. The resync_LRU tracks the whole operation including | |
4569 | * the disk-IO, while the rs_pending_cnt only tracks the blocks | |
4570 | * on the fly. */ | |
b30ab791 AG |
4571 | drbd_rs_cancel_all(device); |
4572 | device->rs_total = 0; | |
4573 | device->rs_failed = 0; | |
4574 | atomic_set(&device->rs_pending_cnt, 0); | |
4575 | wake_up(&device->misc_wait); | |
b411b363 | 4576 | |
b30ab791 AG |
4577 | del_timer_sync(&device->resync_timer); |
4578 | resync_timer_fn((unsigned long)device); | |
b411b363 | 4579 | |
b411b363 PR |
4580 | /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, |
4581 | * w_make_resync_request etc. which may still be on the worker queue | |
4582 | * to be "canceled" */ | |
b30ab791 | 4583 | drbd_flush_workqueue(device); |
b411b363 | 4584 | |
b30ab791 | 4585 | drbd_finish_peer_reqs(device); |
b411b363 | 4586 | |
d10b4ea3 PR |
4587 | /* This second workqueue flush is necessary, since drbd_finish_peer_reqs() |
4588 | might have issued a work again. The one before drbd_finish_peer_reqs() is | |
4589 | necessary to reclain net_ee in drbd_finish_peer_reqs(). */ | |
b30ab791 | 4590 | drbd_flush_workqueue(device); |
d10b4ea3 | 4591 | |
08332d73 LE |
4592 | /* need to do it again, drbd_finish_peer_reqs() may have populated it |
4593 | * again via drbd_try_clear_on_disk_bm(). */ | |
b30ab791 | 4594 | drbd_rs_cancel_all(device); |
b411b363 | 4595 | |
b30ab791 AG |
4596 | kfree(device->p_uuid); |
4597 | device->p_uuid = NULL; | |
b411b363 | 4598 | |
b30ab791 | 4599 | if (!drbd_suspended(device)) |
69a22773 | 4600 | tl_clear(peer_device->connection); |
b411b363 | 4601 | |
b30ab791 | 4602 | drbd_md_sync(device); |
b411b363 | 4603 | |
20ceb2b2 LE |
4604 | /* serialize with bitmap writeout triggered by the state change, |
4605 | * if any. */ | |
b30ab791 | 4606 | wait_event(device->misc_wait, !test_bit(BITMAP_IO, &device->flags)); |
20ceb2b2 | 4607 | |
b411b363 PR |
4608 | /* tcp_close and release of sendpage pages can be deferred. I don't |
4609 | * want to use SO_LINGER, because apparently it can be deferred for | |
4610 | * more than 20 seconds (longest time I checked). | |
4611 | * | |
4612 | * Actually we don't care for exactly when the network stack does its | |
4613 | * put_page(), but release our reference on these pages right here. | |
4614 | */ | |
b30ab791 | 4615 | i = drbd_free_peer_reqs(device, &device->net_ee); |
b411b363 | 4616 | if (i) |
d0180171 | 4617 | drbd_info(device, "net_ee not empty, killed %u entries\n", i); |
b30ab791 | 4618 | i = atomic_read(&device->pp_in_use_by_net); |
435f0740 | 4619 | if (i) |
d0180171 | 4620 | drbd_info(device, "pp_in_use_by_net = %d, expected 0\n", i); |
b30ab791 | 4621 | i = atomic_read(&device->pp_in_use); |
b411b363 | 4622 | if (i) |
d0180171 | 4623 | drbd_info(device, "pp_in_use = %d, expected 0\n", i); |
b411b363 | 4624 | |
0b0ba1ef AG |
4625 | D_ASSERT(device, list_empty(&device->read_ee)); |
4626 | D_ASSERT(device, list_empty(&device->active_ee)); | |
4627 | D_ASSERT(device, list_empty(&device->sync_ee)); | |
4628 | D_ASSERT(device, list_empty(&device->done_ee)); | |
b411b363 | 4629 | |
360cc740 | 4630 | return 0; |
b411b363 PR |
4631 | } |
4632 | ||
4633 | /* | |
4634 | * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version | |
4635 | * we can agree on is stored in agreed_pro_version. | |
4636 | * | |
4637 | * feature flags and the reserved array should be enough room for future | |
4638 | * enhancements of the handshake protocol, and possible plugins... | |
4639 | * | |
4640 | * for now, they are expected to be zero, but ignored. | |
4641 | */ | |
bde89a9e | 4642 | static int drbd_send_features(struct drbd_connection *connection) |
b411b363 | 4643 | { |
9f5bdc33 AG |
4644 | struct drbd_socket *sock; |
4645 | struct p_connection_features *p; | |
b411b363 | 4646 | |
bde89a9e AG |
4647 | sock = &connection->data; |
4648 | p = conn_prepare_command(connection, sock); | |
9f5bdc33 | 4649 | if (!p) |
e8d17b01 | 4650 | return -EIO; |
b411b363 PR |
4651 | memset(p, 0, sizeof(*p)); |
4652 | p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); | |
4653 | p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); | |
bde89a9e | 4654 | return conn_send_command(connection, sock, P_CONNECTION_FEATURES, sizeof(*p), NULL, 0); |
b411b363 PR |
4655 | } |
4656 | ||
4657 | /* | |
4658 | * return values: | |
4659 | * 1 yes, we have a valid connection | |
4660 | * 0 oops, did not work out, please try again | |
4661 | * -1 peer talks different language, | |
4662 | * no point in trying again, please go standalone. | |
4663 | */ | |
bde89a9e | 4664 | static int drbd_do_features(struct drbd_connection *connection) |
b411b363 | 4665 | { |
bde89a9e | 4666 | /* ASSERT current == connection->receiver ... */ |
e658983a AG |
4667 | struct p_connection_features *p; |
4668 | const int expect = sizeof(struct p_connection_features); | |
77351055 | 4669 | struct packet_info pi; |
a5c31904 | 4670 | int err; |
b411b363 | 4671 | |
bde89a9e | 4672 | err = drbd_send_features(connection); |
e8d17b01 | 4673 | if (err) |
b411b363 PR |
4674 | return 0; |
4675 | ||
bde89a9e | 4676 | err = drbd_recv_header(connection, &pi); |
69bc7bc3 | 4677 | if (err) |
b411b363 PR |
4678 | return 0; |
4679 | ||
6038178e | 4680 | if (pi.cmd != P_CONNECTION_FEATURES) { |
1ec861eb | 4681 | drbd_err(connection, "expected ConnectionFeatures packet, received: %s (0x%04x)\n", |
2fcb8f30 | 4682 | cmdname(pi.cmd), pi.cmd); |
b411b363 PR |
4683 | return -1; |
4684 | } | |
4685 | ||
77351055 | 4686 | if (pi.size != expect) { |
1ec861eb | 4687 | drbd_err(connection, "expected ConnectionFeatures length: %u, received: %u\n", |
77351055 | 4688 | expect, pi.size); |
b411b363 PR |
4689 | return -1; |
4690 | } | |
4691 | ||
e658983a | 4692 | p = pi.data; |
bde89a9e | 4693 | err = drbd_recv_all_warn(connection, p, expect); |
a5c31904 | 4694 | if (err) |
b411b363 | 4695 | return 0; |
b411b363 | 4696 | |
b411b363 PR |
4697 | p->protocol_min = be32_to_cpu(p->protocol_min); |
4698 | p->protocol_max = be32_to_cpu(p->protocol_max); | |
4699 | if (p->protocol_max == 0) | |
4700 | p->protocol_max = p->protocol_min; | |
4701 | ||
4702 | if (PRO_VERSION_MAX < p->protocol_min || | |
4703 | PRO_VERSION_MIN > p->protocol_max) | |
4704 | goto incompat; | |
4705 | ||
bde89a9e | 4706 | connection->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); |
b411b363 | 4707 | |
1ec861eb | 4708 | drbd_info(connection, "Handshake successful: " |
bde89a9e | 4709 | "Agreed network protocol version %d\n", connection->agreed_pro_version); |
b411b363 PR |
4710 | |
4711 | return 1; | |
4712 | ||
4713 | incompat: | |
1ec861eb | 4714 | drbd_err(connection, "incompatible DRBD dialects: " |
b411b363 PR |
4715 | "I support %d-%d, peer supports %d-%d\n", |
4716 | PRO_VERSION_MIN, PRO_VERSION_MAX, | |
4717 | p->protocol_min, p->protocol_max); | |
4718 | return -1; | |
4719 | } | |
4720 | ||
4721 | #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) | |
bde89a9e | 4722 | static int drbd_do_auth(struct drbd_connection *connection) |
b411b363 | 4723 | { |
1ec861eb AG |
4724 | drbd_err(connection, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); |
4725 | drbd_err(connection, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); | |
b10d96cb | 4726 | return -1; |
b411b363 PR |
4727 | } |
4728 | #else | |
4729 | #define CHALLENGE_LEN 64 | |
b10d96cb JT |
4730 | |
4731 | /* Return value: | |
4732 | 1 - auth succeeded, | |
4733 | 0 - failed, try again (network error), | |
4734 | -1 - auth failed, don't try again. | |
4735 | */ | |
4736 | ||
bde89a9e | 4737 | static int drbd_do_auth(struct drbd_connection *connection) |
b411b363 | 4738 | { |
9f5bdc33 | 4739 | struct drbd_socket *sock; |
b411b363 PR |
4740 | char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ |
4741 | struct scatterlist sg; | |
4742 | char *response = NULL; | |
4743 | char *right_response = NULL; | |
4744 | char *peers_ch = NULL; | |
44ed167d PR |
4745 | unsigned int key_len; |
4746 | char secret[SHARED_SECRET_MAX]; /* 64 byte */ | |
b411b363 PR |
4747 | unsigned int resp_size; |
4748 | struct hash_desc desc; | |
77351055 | 4749 | struct packet_info pi; |
44ed167d | 4750 | struct net_conf *nc; |
69bc7bc3 | 4751 | int err, rv; |
b411b363 | 4752 | |
9f5bdc33 | 4753 | /* FIXME: Put the challenge/response into the preallocated socket buffer. */ |
b411b363 | 4754 | |
44ed167d | 4755 | rcu_read_lock(); |
bde89a9e | 4756 | nc = rcu_dereference(connection->net_conf); |
44ed167d PR |
4757 | key_len = strlen(nc->shared_secret); |
4758 | memcpy(secret, nc->shared_secret, key_len); | |
4759 | rcu_read_unlock(); | |
4760 | ||
bde89a9e | 4761 | desc.tfm = connection->cram_hmac_tfm; |
b411b363 PR |
4762 | desc.flags = 0; |
4763 | ||
bde89a9e | 4764 | rv = crypto_hash_setkey(connection->cram_hmac_tfm, (u8 *)secret, key_len); |
b411b363 | 4765 | if (rv) { |
1ec861eb | 4766 | drbd_err(connection, "crypto_hash_setkey() failed with %d\n", rv); |
b10d96cb | 4767 | rv = -1; |
b411b363 PR |
4768 | goto fail; |
4769 | } | |
4770 | ||
4771 | get_random_bytes(my_challenge, CHALLENGE_LEN); | |
4772 | ||
bde89a9e AG |
4773 | sock = &connection->data; |
4774 | if (!conn_prepare_command(connection, sock)) { | |
9f5bdc33 AG |
4775 | rv = 0; |
4776 | goto fail; | |
4777 | } | |
bde89a9e | 4778 | rv = !conn_send_command(connection, sock, P_AUTH_CHALLENGE, 0, |
9f5bdc33 | 4779 | my_challenge, CHALLENGE_LEN); |
b411b363 PR |
4780 | if (!rv) |
4781 | goto fail; | |
4782 | ||
bde89a9e | 4783 | err = drbd_recv_header(connection, &pi); |
69bc7bc3 AG |
4784 | if (err) { |
4785 | rv = 0; | |
b411b363 | 4786 | goto fail; |
69bc7bc3 | 4787 | } |
b411b363 | 4788 | |
77351055 | 4789 | if (pi.cmd != P_AUTH_CHALLENGE) { |
1ec861eb | 4790 | drbd_err(connection, "expected AuthChallenge packet, received: %s (0x%04x)\n", |
2fcb8f30 | 4791 | cmdname(pi.cmd), pi.cmd); |
b411b363 PR |
4792 | rv = 0; |
4793 | goto fail; | |
4794 | } | |
4795 | ||
77351055 | 4796 | if (pi.size > CHALLENGE_LEN * 2) { |
1ec861eb | 4797 | drbd_err(connection, "expected AuthChallenge payload too big.\n"); |
b10d96cb | 4798 | rv = -1; |
b411b363 PR |
4799 | goto fail; |
4800 | } | |
4801 | ||
77351055 | 4802 | peers_ch = kmalloc(pi.size, GFP_NOIO); |
b411b363 | 4803 | if (peers_ch == NULL) { |
1ec861eb | 4804 | drbd_err(connection, "kmalloc of peers_ch failed\n"); |
b10d96cb | 4805 | rv = -1; |
b411b363 PR |
4806 | goto fail; |
4807 | } | |
4808 | ||
bde89a9e | 4809 | err = drbd_recv_all_warn(connection, peers_ch, pi.size); |
a5c31904 | 4810 | if (err) { |
b411b363 PR |
4811 | rv = 0; |
4812 | goto fail; | |
4813 | } | |
4814 | ||
bde89a9e | 4815 | resp_size = crypto_hash_digestsize(connection->cram_hmac_tfm); |
b411b363 PR |
4816 | response = kmalloc(resp_size, GFP_NOIO); |
4817 | if (response == NULL) { | |
1ec861eb | 4818 | drbd_err(connection, "kmalloc of response failed\n"); |
b10d96cb | 4819 | rv = -1; |
b411b363 PR |
4820 | goto fail; |
4821 | } | |
4822 | ||
4823 | sg_init_table(&sg, 1); | |
77351055 | 4824 | sg_set_buf(&sg, peers_ch, pi.size); |
b411b363 PR |
4825 | |
4826 | rv = crypto_hash_digest(&desc, &sg, sg.length, response); | |
4827 | if (rv) { | |
1ec861eb | 4828 | drbd_err(connection, "crypto_hash_digest() failed with %d\n", rv); |
b10d96cb | 4829 | rv = -1; |
b411b363 PR |
4830 | goto fail; |
4831 | } | |
4832 | ||
bde89a9e | 4833 | if (!conn_prepare_command(connection, sock)) { |
9f5bdc33 | 4834 | rv = 0; |
b411b363 | 4835 | goto fail; |
9f5bdc33 | 4836 | } |
bde89a9e | 4837 | rv = !conn_send_command(connection, sock, P_AUTH_RESPONSE, 0, |
9f5bdc33 | 4838 | response, resp_size); |
b411b363 PR |
4839 | if (!rv) |
4840 | goto fail; | |
4841 | ||
bde89a9e | 4842 | err = drbd_recv_header(connection, &pi); |
69bc7bc3 | 4843 | if (err) { |
b411b363 PR |
4844 | rv = 0; |
4845 | goto fail; | |
4846 | } | |
4847 | ||
77351055 | 4848 | if (pi.cmd != P_AUTH_RESPONSE) { |
1ec861eb | 4849 | drbd_err(connection, "expected AuthResponse packet, received: %s (0x%04x)\n", |
2fcb8f30 | 4850 | cmdname(pi.cmd), pi.cmd); |
b411b363 PR |
4851 | rv = 0; |
4852 | goto fail; | |
4853 | } | |
4854 | ||
77351055 | 4855 | if (pi.size != resp_size) { |
1ec861eb | 4856 | drbd_err(connection, "expected AuthResponse payload of wrong size\n"); |
b411b363 PR |
4857 | rv = 0; |
4858 | goto fail; | |
4859 | } | |
b411b363 | 4860 | |
bde89a9e | 4861 | err = drbd_recv_all_warn(connection, response , resp_size); |
a5c31904 | 4862 | if (err) { |
b411b363 PR |
4863 | rv = 0; |
4864 | goto fail; | |
4865 | } | |
4866 | ||
4867 | right_response = kmalloc(resp_size, GFP_NOIO); | |
2d1ee87d | 4868 | if (right_response == NULL) { |
1ec861eb | 4869 | drbd_err(connection, "kmalloc of right_response failed\n"); |
b10d96cb | 4870 | rv = -1; |
b411b363 PR |
4871 | goto fail; |
4872 | } | |
4873 | ||
4874 | sg_set_buf(&sg, my_challenge, CHALLENGE_LEN); | |
4875 | ||
4876 | rv = crypto_hash_digest(&desc, &sg, sg.length, right_response); | |
4877 | if (rv) { | |
1ec861eb | 4878 | drbd_err(connection, "crypto_hash_digest() failed with %d\n", rv); |
b10d96cb | 4879 | rv = -1; |
b411b363 PR |
4880 | goto fail; |
4881 | } | |
4882 | ||
4883 | rv = !memcmp(response, right_response, resp_size); | |
4884 | ||
4885 | if (rv) | |
1ec861eb | 4886 | drbd_info(connection, "Peer authenticated using %d bytes HMAC\n", |
44ed167d | 4887 | resp_size); |
b10d96cb JT |
4888 | else |
4889 | rv = -1; | |
b411b363 PR |
4890 | |
4891 | fail: | |
4892 | kfree(peers_ch); | |
4893 | kfree(response); | |
4894 | kfree(right_response); | |
4895 | ||
4896 | return rv; | |
4897 | } | |
4898 | #endif | |
4899 | ||
8fe60551 | 4900 | int drbd_receiver(struct drbd_thread *thi) |
b411b363 | 4901 | { |
bde89a9e | 4902 | struct drbd_connection *connection = thi->connection; |
b411b363 PR |
4903 | int h; |
4904 | ||
1ec861eb | 4905 | drbd_info(connection, "receiver (re)started\n"); |
b411b363 PR |
4906 | |
4907 | do { | |
bde89a9e | 4908 | h = conn_connect(connection); |
b411b363 | 4909 | if (h == 0) { |
bde89a9e | 4910 | conn_disconnect(connection); |
20ee6390 | 4911 | schedule_timeout_interruptible(HZ); |
b411b363 PR |
4912 | } |
4913 | if (h == -1) { | |
1ec861eb | 4914 | drbd_warn(connection, "Discarding network configuration.\n"); |
bde89a9e | 4915 | conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 PR |
4916 | } |
4917 | } while (h == 0); | |
4918 | ||
91fd4dad | 4919 | if (h > 0) |
bde89a9e | 4920 | drbdd(connection); |
b411b363 | 4921 | |
bde89a9e | 4922 | conn_disconnect(connection); |
b411b363 | 4923 | |
1ec861eb | 4924 | drbd_info(connection, "receiver terminated\n"); |
b411b363 PR |
4925 | return 0; |
4926 | } | |
4927 | ||
4928 | /* ********* acknowledge sender ******** */ | |
4929 | ||
bde89a9e | 4930 | static int got_conn_RqSReply(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 4931 | { |
e658983a | 4932 | struct p_req_state_reply *p = pi->data; |
e4f78ede PR |
4933 | int retcode = be32_to_cpu(p->retcode); |
4934 | ||
4935 | if (retcode >= SS_SUCCESS) { | |
bde89a9e | 4936 | set_bit(CONN_WD_ST_CHG_OKAY, &connection->flags); |
e4f78ede | 4937 | } else { |
bde89a9e | 4938 | set_bit(CONN_WD_ST_CHG_FAIL, &connection->flags); |
1ec861eb | 4939 | drbd_err(connection, "Requested state change failed by peer: %s (%d)\n", |
e4f78ede PR |
4940 | drbd_set_st_err_str(retcode), retcode); |
4941 | } | |
bde89a9e | 4942 | wake_up(&connection->ping_wait); |
e4f78ede | 4943 | |
2735a594 | 4944 | return 0; |
e4f78ede | 4945 | } |
b411b363 | 4946 | |
bde89a9e | 4947 | static int got_RqSReply(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 4948 | { |
9f4fe9ad | 4949 | struct drbd_peer_device *peer_device; |
b30ab791 | 4950 | struct drbd_device *device; |
e658983a | 4951 | struct p_req_state_reply *p = pi->data; |
b411b363 PR |
4952 | int retcode = be32_to_cpu(p->retcode); |
4953 | ||
9f4fe9ad AG |
4954 | peer_device = conn_peer_device(connection, pi->vnr); |
4955 | if (!peer_device) | |
2735a594 | 4956 | return -EIO; |
9f4fe9ad | 4957 | device = peer_device->device; |
1952e916 | 4958 | |
bde89a9e | 4959 | if (test_bit(CONN_WD_ST_CHG_REQ, &connection->flags)) { |
0b0ba1ef | 4960 | D_ASSERT(device, connection->agreed_pro_version < 100); |
bde89a9e | 4961 | return got_conn_RqSReply(connection, pi); |
4d0fc3fd PR |
4962 | } |
4963 | ||
b411b363 | 4964 | if (retcode >= SS_SUCCESS) { |
b30ab791 | 4965 | set_bit(CL_ST_CHG_SUCCESS, &device->flags); |
b411b363 | 4966 | } else { |
b30ab791 | 4967 | set_bit(CL_ST_CHG_FAIL, &device->flags); |
d0180171 | 4968 | drbd_err(device, "Requested state change failed by peer: %s (%d)\n", |
e4f78ede | 4969 | drbd_set_st_err_str(retcode), retcode); |
b411b363 | 4970 | } |
b30ab791 | 4971 | wake_up(&device->state_wait); |
b411b363 | 4972 | |
2735a594 | 4973 | return 0; |
b411b363 PR |
4974 | } |
4975 | ||
bde89a9e | 4976 | static int got_Ping(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 4977 | { |
bde89a9e | 4978 | return drbd_send_ping_ack(connection); |
b411b363 PR |
4979 | |
4980 | } | |
4981 | ||
bde89a9e | 4982 | static int got_PingAck(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 PR |
4983 | { |
4984 | /* restore idle timeout */ | |
bde89a9e AG |
4985 | connection->meta.socket->sk->sk_rcvtimeo = connection->net_conf->ping_int*HZ; |
4986 | if (!test_and_set_bit(GOT_PING_ACK, &connection->flags)) | |
4987 | wake_up(&connection->ping_wait); | |
b411b363 | 4988 | |
2735a594 | 4989 | return 0; |
b411b363 PR |
4990 | } |
4991 | ||
bde89a9e | 4992 | static int got_IsInSync(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 4993 | { |
9f4fe9ad | 4994 | struct drbd_peer_device *peer_device; |
b30ab791 | 4995 | struct drbd_device *device; |
e658983a | 4996 | struct p_block_ack *p = pi->data; |
b411b363 PR |
4997 | sector_t sector = be64_to_cpu(p->sector); |
4998 | int blksize = be32_to_cpu(p->blksize); | |
4999 | ||
9f4fe9ad AG |
5000 | peer_device = conn_peer_device(connection, pi->vnr); |
5001 | if (!peer_device) | |
2735a594 | 5002 | return -EIO; |
9f4fe9ad | 5003 | device = peer_device->device; |
1952e916 | 5004 | |
9f4fe9ad | 5005 | D_ASSERT(device, peer_device->connection->agreed_pro_version >= 89); |
b411b363 | 5006 | |
69a22773 | 5007 | update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
b411b363 | 5008 | |
b30ab791 AG |
5009 | if (get_ldev(device)) { |
5010 | drbd_rs_complete_io(device, sector); | |
5011 | drbd_set_in_sync(device, sector, blksize); | |
1d53f09e | 5012 | /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ |
b30ab791 AG |
5013 | device->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); |
5014 | put_ldev(device); | |
1d53f09e | 5015 | } |
b30ab791 AG |
5016 | dec_rs_pending(device); |
5017 | atomic_add(blksize >> 9, &device->rs_sect_in); | |
b411b363 | 5018 | |
2735a594 | 5019 | return 0; |
b411b363 PR |
5020 | } |
5021 | ||
bc9c5c41 | 5022 | static int |
b30ab791 | 5023 | validate_req_change_req_state(struct drbd_device *device, u64 id, sector_t sector, |
bc9c5c41 AG |
5024 | struct rb_root *root, const char *func, |
5025 | enum drbd_req_event what, bool missing_ok) | |
b411b363 PR |
5026 | { |
5027 | struct drbd_request *req; | |
5028 | struct bio_and_error m; | |
5029 | ||
0500813f | 5030 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 | 5031 | req = find_request(device, root, id, sector, missing_ok, func); |
b411b363 | 5032 | if (unlikely(!req)) { |
0500813f | 5033 | spin_unlock_irq(&device->resource->req_lock); |
85997675 | 5034 | return -EIO; |
b411b363 PR |
5035 | } |
5036 | __req_mod(req, what, &m); | |
0500813f | 5037 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 PR |
5038 | |
5039 | if (m.bio) | |
b30ab791 | 5040 | complete_master_bio(device, &m); |
85997675 | 5041 | return 0; |
b411b363 PR |
5042 | } |
5043 | ||
bde89a9e | 5044 | static int got_BlockAck(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5045 | { |
9f4fe9ad | 5046 | struct drbd_peer_device *peer_device; |
b30ab791 | 5047 | struct drbd_device *device; |
e658983a | 5048 | struct p_block_ack *p = pi->data; |
b411b363 PR |
5049 | sector_t sector = be64_to_cpu(p->sector); |
5050 | int blksize = be32_to_cpu(p->blksize); | |
5051 | enum drbd_req_event what; | |
5052 | ||
9f4fe9ad AG |
5053 | peer_device = conn_peer_device(connection, pi->vnr); |
5054 | if (!peer_device) | |
2735a594 | 5055 | return -EIO; |
9f4fe9ad | 5056 | device = peer_device->device; |
1952e916 | 5057 | |
69a22773 | 5058 | update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
b411b363 | 5059 | |
579b57ed | 5060 | if (p->block_id == ID_SYNCER) { |
b30ab791 AG |
5061 | drbd_set_in_sync(device, sector, blksize); |
5062 | dec_rs_pending(device); | |
2735a594 | 5063 | return 0; |
b411b363 | 5064 | } |
e05e1e59 | 5065 | switch (pi->cmd) { |
b411b363 | 5066 | case P_RS_WRITE_ACK: |
8554df1c | 5067 | what = WRITE_ACKED_BY_PEER_AND_SIS; |
b411b363 PR |
5068 | break; |
5069 | case P_WRITE_ACK: | |
8554df1c | 5070 | what = WRITE_ACKED_BY_PEER; |
b411b363 PR |
5071 | break; |
5072 | case P_RECV_ACK: | |
8554df1c | 5073 | what = RECV_ACKED_BY_PEER; |
b411b363 | 5074 | break; |
d4dabbe2 LE |
5075 | case P_SUPERSEDED: |
5076 | what = CONFLICT_RESOLVED; | |
b411b363 | 5077 | break; |
7be8da07 | 5078 | case P_RETRY_WRITE: |
7be8da07 | 5079 | what = POSTPONE_WRITE; |
b411b363 PR |
5080 | break; |
5081 | default: | |
2735a594 | 5082 | BUG(); |
b411b363 PR |
5083 | } |
5084 | ||
b30ab791 AG |
5085 | return validate_req_change_req_state(device, p->block_id, sector, |
5086 | &device->write_requests, __func__, | |
2735a594 | 5087 | what, false); |
b411b363 PR |
5088 | } |
5089 | ||
bde89a9e | 5090 | static int got_NegAck(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5091 | { |
9f4fe9ad | 5092 | struct drbd_peer_device *peer_device; |
b30ab791 | 5093 | struct drbd_device *device; |
e658983a | 5094 | struct p_block_ack *p = pi->data; |
b411b363 | 5095 | sector_t sector = be64_to_cpu(p->sector); |
2deb8336 | 5096 | int size = be32_to_cpu(p->blksize); |
85997675 | 5097 | int err; |
b411b363 | 5098 | |
9f4fe9ad AG |
5099 | peer_device = conn_peer_device(connection, pi->vnr); |
5100 | if (!peer_device) | |
2735a594 | 5101 | return -EIO; |
9f4fe9ad | 5102 | device = peer_device->device; |
b411b363 | 5103 | |
69a22773 | 5104 | update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
b411b363 | 5105 | |
579b57ed | 5106 | if (p->block_id == ID_SYNCER) { |
b30ab791 AG |
5107 | dec_rs_pending(device); |
5108 | drbd_rs_failed_io(device, sector, size); | |
2735a594 | 5109 | return 0; |
b411b363 | 5110 | } |
2deb8336 | 5111 | |
b30ab791 AG |
5112 | err = validate_req_change_req_state(device, p->block_id, sector, |
5113 | &device->write_requests, __func__, | |
303d1448 | 5114 | NEG_ACKED, true); |
85997675 | 5115 | if (err) { |
c3afd8f5 AG |
5116 | /* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs. |
5117 | The master bio might already be completed, therefore the | |
5118 | request is no longer in the collision hash. */ | |
5119 | /* In Protocol B we might already have got a P_RECV_ACK | |
5120 | but then get a P_NEG_ACK afterwards. */ | |
b30ab791 | 5121 | drbd_set_out_of_sync(device, sector, size); |
2deb8336 | 5122 | } |
2735a594 | 5123 | return 0; |
b411b363 PR |
5124 | } |
5125 | ||
bde89a9e | 5126 | static int got_NegDReply(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5127 | { |
9f4fe9ad | 5128 | struct drbd_peer_device *peer_device; |
b30ab791 | 5129 | struct drbd_device *device; |
e658983a | 5130 | struct p_block_ack *p = pi->data; |
b411b363 PR |
5131 | sector_t sector = be64_to_cpu(p->sector); |
5132 | ||
9f4fe9ad AG |
5133 | peer_device = conn_peer_device(connection, pi->vnr); |
5134 | if (!peer_device) | |
2735a594 | 5135 | return -EIO; |
9f4fe9ad | 5136 | device = peer_device->device; |
1952e916 | 5137 | |
69a22773 | 5138 | update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
7be8da07 | 5139 | |
d0180171 | 5140 | drbd_err(device, "Got NegDReply; Sector %llus, len %u.\n", |
b411b363 PR |
5141 | (unsigned long long)sector, be32_to_cpu(p->blksize)); |
5142 | ||
b30ab791 AG |
5143 | return validate_req_change_req_state(device, p->block_id, sector, |
5144 | &device->read_requests, __func__, | |
2735a594 | 5145 | NEG_ACKED, false); |
b411b363 PR |
5146 | } |
5147 | ||
bde89a9e | 5148 | static int got_NegRSDReply(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5149 | { |
9f4fe9ad | 5150 | struct drbd_peer_device *peer_device; |
b30ab791 | 5151 | struct drbd_device *device; |
b411b363 PR |
5152 | sector_t sector; |
5153 | int size; | |
e658983a | 5154 | struct p_block_ack *p = pi->data; |
1952e916 | 5155 | |
9f4fe9ad AG |
5156 | peer_device = conn_peer_device(connection, pi->vnr); |
5157 | if (!peer_device) | |
2735a594 | 5158 | return -EIO; |
9f4fe9ad | 5159 | device = peer_device->device; |
b411b363 PR |
5160 | |
5161 | sector = be64_to_cpu(p->sector); | |
5162 | size = be32_to_cpu(p->blksize); | |
b411b363 | 5163 | |
69a22773 | 5164 | update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
b411b363 | 5165 | |
b30ab791 | 5166 | dec_rs_pending(device); |
b411b363 | 5167 | |
b30ab791 AG |
5168 | if (get_ldev_if_state(device, D_FAILED)) { |
5169 | drbd_rs_complete_io(device, sector); | |
e05e1e59 | 5170 | switch (pi->cmd) { |
d612d309 | 5171 | case P_NEG_RS_DREPLY: |
b30ab791 | 5172 | drbd_rs_failed_io(device, sector, size); |
d612d309 PR |
5173 | case P_RS_CANCEL: |
5174 | break; | |
5175 | default: | |
2735a594 | 5176 | BUG(); |
d612d309 | 5177 | } |
b30ab791 | 5178 | put_ldev(device); |
b411b363 PR |
5179 | } |
5180 | ||
2735a594 | 5181 | return 0; |
b411b363 PR |
5182 | } |
5183 | ||
bde89a9e | 5184 | static int got_BarrierAck(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5185 | { |
e658983a | 5186 | struct p_barrier_ack *p = pi->data; |
c06ece6b | 5187 | struct drbd_peer_device *peer_device; |
9ed57dcb | 5188 | int vnr; |
1952e916 | 5189 | |
bde89a9e | 5190 | tl_release(connection, p->barrier, be32_to_cpu(p->set_size)); |
b411b363 | 5191 | |
9ed57dcb | 5192 | rcu_read_lock(); |
c06ece6b AG |
5193 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
5194 | struct drbd_device *device = peer_device->device; | |
5195 | ||
b30ab791 AG |
5196 | if (device->state.conn == C_AHEAD && |
5197 | atomic_read(&device->ap_in_flight) == 0 && | |
5198 | !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &device->flags)) { | |
5199 | device->start_resync_timer.expires = jiffies + HZ; | |
5200 | add_timer(&device->start_resync_timer); | |
9ed57dcb | 5201 | } |
c4752ef1 | 5202 | } |
9ed57dcb | 5203 | rcu_read_unlock(); |
c4752ef1 | 5204 | |
2735a594 | 5205 | return 0; |
b411b363 PR |
5206 | } |
5207 | ||
bde89a9e | 5208 | static int got_OVResult(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5209 | { |
9f4fe9ad | 5210 | struct drbd_peer_device *peer_device; |
b30ab791 | 5211 | struct drbd_device *device; |
e658983a | 5212 | struct p_block_ack *p = pi->data; |
b411b363 PR |
5213 | struct drbd_work *w; |
5214 | sector_t sector; | |
5215 | int size; | |
5216 | ||
9f4fe9ad AG |
5217 | peer_device = conn_peer_device(connection, pi->vnr); |
5218 | if (!peer_device) | |
2735a594 | 5219 | return -EIO; |
9f4fe9ad | 5220 | device = peer_device->device; |
1952e916 | 5221 | |
b411b363 PR |
5222 | sector = be64_to_cpu(p->sector); |
5223 | size = be32_to_cpu(p->blksize); | |
5224 | ||
69a22773 | 5225 | update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
b411b363 PR |
5226 | |
5227 | if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) | |
b30ab791 | 5228 | drbd_ov_out_of_sync_found(device, sector, size); |
b411b363 | 5229 | else |
b30ab791 | 5230 | ov_out_of_sync_print(device); |
b411b363 | 5231 | |
b30ab791 | 5232 | if (!get_ldev(device)) |
2735a594 | 5233 | return 0; |
1d53f09e | 5234 | |
b30ab791 AG |
5235 | drbd_rs_complete_io(device, sector); |
5236 | dec_rs_pending(device); | |
b411b363 | 5237 | |
b30ab791 | 5238 | --device->ov_left; |
ea5442af LE |
5239 | |
5240 | /* let's advance progress step marks only for every other megabyte */ | |
b30ab791 AG |
5241 | if ((device->ov_left & 0x200) == 0x200) |
5242 | drbd_advance_rs_marks(device, device->ov_left); | |
ea5442af | 5243 | |
b30ab791 | 5244 | if (device->ov_left == 0) { |
b411b363 PR |
5245 | w = kmalloc(sizeof(*w), GFP_NOIO); |
5246 | if (w) { | |
5247 | w->cb = w_ov_finished; | |
b30ab791 | 5248 | w->device = device; |
9f4fe9ad | 5249 | drbd_queue_work(&peer_device->connection->sender_work, w); |
b411b363 | 5250 | } else { |
d0180171 | 5251 | drbd_err(device, "kmalloc(w) failed."); |
b30ab791 AG |
5252 | ov_out_of_sync_print(device); |
5253 | drbd_resync_finished(device); | |
b411b363 PR |
5254 | } |
5255 | } | |
b30ab791 | 5256 | put_ldev(device); |
2735a594 | 5257 | return 0; |
b411b363 PR |
5258 | } |
5259 | ||
bde89a9e | 5260 | static int got_skip(struct drbd_connection *connection, struct packet_info *pi) |
0ced55a3 | 5261 | { |
2735a594 | 5262 | return 0; |
b411b363 PR |
5263 | } |
5264 | ||
bde89a9e | 5265 | static int connection_finish_peer_reqs(struct drbd_connection *connection) |
0ced55a3 | 5266 | { |
c06ece6b | 5267 | struct drbd_peer_device *peer_device; |
c141ebda | 5268 | int vnr, not_empty = 0; |
32862ec7 PR |
5269 | |
5270 | do { | |
bde89a9e | 5271 | clear_bit(SIGNAL_ASENDER, &connection->flags); |
32862ec7 | 5272 | flush_signals(current); |
c141ebda PR |
5273 | |
5274 | rcu_read_lock(); | |
c06ece6b AG |
5275 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
5276 | struct drbd_device *device = peer_device->device; | |
b30ab791 | 5277 | kref_get(&device->kref); |
c141ebda | 5278 | rcu_read_unlock(); |
b30ab791 | 5279 | if (drbd_finish_peer_reqs(device)) { |
05a10ec7 | 5280 | kref_put(&device->kref, drbd_destroy_device); |
c141ebda | 5281 | return 1; |
d3fcb490 | 5282 | } |
05a10ec7 | 5283 | kref_put(&device->kref, drbd_destroy_device); |
c141ebda | 5284 | rcu_read_lock(); |
082a3439 | 5285 | } |
bde89a9e | 5286 | set_bit(SIGNAL_ASENDER, &connection->flags); |
082a3439 | 5287 | |
0500813f | 5288 | spin_lock_irq(&connection->resource->req_lock); |
c06ece6b AG |
5289 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
5290 | struct drbd_device *device = peer_device->device; | |
b30ab791 | 5291 | not_empty = !list_empty(&device->done_ee); |
082a3439 PR |
5292 | if (not_empty) |
5293 | break; | |
5294 | } | |
0500813f | 5295 | spin_unlock_irq(&connection->resource->req_lock); |
c141ebda | 5296 | rcu_read_unlock(); |
32862ec7 PR |
5297 | } while (not_empty); |
5298 | ||
5299 | return 0; | |
0ced55a3 PR |
5300 | } |
5301 | ||
b411b363 PR |
5302 | struct asender_cmd { |
5303 | size_t pkt_size; | |
bde89a9e | 5304 | int (*fn)(struct drbd_connection *connection, struct packet_info *); |
b411b363 PR |
5305 | }; |
5306 | ||
7201b972 | 5307 | static struct asender_cmd asender_tbl[] = { |
e658983a AG |
5308 | [P_PING] = { 0, got_Ping }, |
5309 | [P_PING_ACK] = { 0, got_PingAck }, | |
b411b363 PR |
5310 | [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, |
5311 | [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, | |
5312 | [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, | |
d4dabbe2 | 5313 | [P_SUPERSEDED] = { sizeof(struct p_block_ack), got_BlockAck }, |
b411b363 PR |
5314 | [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, |
5315 | [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, | |
1952e916 | 5316 | [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply }, |
b411b363 PR |
5317 | [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, |
5318 | [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, | |
5319 | [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, | |
5320 | [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, | |
02918be2 | 5321 | [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip }, |
1952e916 AG |
5322 | [P_RS_CANCEL] = { sizeof(struct p_block_ack), got_NegRSDReply }, |
5323 | [P_CONN_ST_CHG_REPLY]={ sizeof(struct p_req_state_reply), got_conn_RqSReply }, | |
5324 | [P_RETRY_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, | |
7201b972 | 5325 | }; |
b411b363 PR |
5326 | |
5327 | int drbd_asender(struct drbd_thread *thi) | |
5328 | { | |
bde89a9e | 5329 | struct drbd_connection *connection = thi->connection; |
b411b363 | 5330 | struct asender_cmd *cmd = NULL; |
77351055 | 5331 | struct packet_info pi; |
257d0af6 | 5332 | int rv; |
bde89a9e | 5333 | void *buf = connection->meta.rbuf; |
b411b363 | 5334 | int received = 0; |
bde89a9e | 5335 | unsigned int header_size = drbd_header_size(connection); |
52b061a4 | 5336 | int expect = header_size; |
44ed167d PR |
5337 | bool ping_timeout_active = false; |
5338 | struct net_conf *nc; | |
bb77d34e | 5339 | int ping_timeo, tcp_cork, ping_int; |
3990e04d | 5340 | struct sched_param param = { .sched_priority = 2 }; |
b411b363 | 5341 | |
3990e04d PR |
5342 | rv = sched_setscheduler(current, SCHED_RR, ¶m); |
5343 | if (rv < 0) | |
1ec861eb | 5344 | drbd_err(connection, "drbd_asender: ERROR set priority, ret=%d\n", rv); |
b411b363 | 5345 | |
e77a0a5c | 5346 | while (get_t_state(thi) == RUNNING) { |
80822284 | 5347 | drbd_thread_current_set_cpu(thi); |
b411b363 | 5348 | |
44ed167d | 5349 | rcu_read_lock(); |
bde89a9e | 5350 | nc = rcu_dereference(connection->net_conf); |
44ed167d | 5351 | ping_timeo = nc->ping_timeo; |
bb77d34e | 5352 | tcp_cork = nc->tcp_cork; |
44ed167d PR |
5353 | ping_int = nc->ping_int; |
5354 | rcu_read_unlock(); | |
5355 | ||
bde89a9e AG |
5356 | if (test_and_clear_bit(SEND_PING, &connection->flags)) { |
5357 | if (drbd_send_ping(connection)) { | |
1ec861eb | 5358 | drbd_err(connection, "drbd_send_ping has failed\n"); |
b411b363 | 5359 | goto reconnect; |
841ce241 | 5360 | } |
bde89a9e | 5361 | connection->meta.socket->sk->sk_rcvtimeo = ping_timeo * HZ / 10; |
44ed167d | 5362 | ping_timeout_active = true; |
b411b363 PR |
5363 | } |
5364 | ||
32862ec7 PR |
5365 | /* TODO: conditionally cork; it may hurt latency if we cork without |
5366 | much to send */ | |
bb77d34e | 5367 | if (tcp_cork) |
bde89a9e AG |
5368 | drbd_tcp_cork(connection->meta.socket); |
5369 | if (connection_finish_peer_reqs(connection)) { | |
1ec861eb | 5370 | drbd_err(connection, "connection_finish_peer_reqs() failed\n"); |
32862ec7 | 5371 | goto reconnect; |
b411b363 PR |
5372 | } |
5373 | /* but unconditionally uncork unless disabled */ | |
bb77d34e | 5374 | if (tcp_cork) |
bde89a9e | 5375 | drbd_tcp_uncork(connection->meta.socket); |
b411b363 PR |
5376 | |
5377 | /* short circuit, recv_msg would return EINTR anyways. */ | |
5378 | if (signal_pending(current)) | |
5379 | continue; | |
5380 | ||
bde89a9e AG |
5381 | rv = drbd_recv_short(connection->meta.socket, buf, expect-received, 0); |
5382 | clear_bit(SIGNAL_ASENDER, &connection->flags); | |
b411b363 PR |
5383 | |
5384 | flush_signals(current); | |
5385 | ||
5386 | /* Note: | |
5387 | * -EINTR (on meta) we got a signal | |
5388 | * -EAGAIN (on meta) rcvtimeo expired | |
5389 | * -ECONNRESET other side closed the connection | |
5390 | * -ERESTARTSYS (on data) we got a signal | |
5391 | * rv < 0 other than above: unexpected error! | |
5392 | * rv == expected: full header or command | |
5393 | * rv < expected: "woken" by signal during receive | |
5394 | * rv == 0 : "connection shut down by peer" | |
5395 | */ | |
5396 | if (likely(rv > 0)) { | |
5397 | received += rv; | |
5398 | buf += rv; | |
5399 | } else if (rv == 0) { | |
bde89a9e | 5400 | if (test_bit(DISCONNECT_SENT, &connection->flags)) { |
b66623e3 PR |
5401 | long t; |
5402 | rcu_read_lock(); | |
bde89a9e | 5403 | t = rcu_dereference(connection->net_conf)->ping_timeo * HZ/10; |
b66623e3 PR |
5404 | rcu_read_unlock(); |
5405 | ||
bde89a9e AG |
5406 | t = wait_event_timeout(connection->ping_wait, |
5407 | connection->cstate < C_WF_REPORT_PARAMS, | |
b66623e3 | 5408 | t); |
599377ac PR |
5409 | if (t) |
5410 | break; | |
5411 | } | |
1ec861eb | 5412 | drbd_err(connection, "meta connection shut down by peer.\n"); |
b411b363 PR |
5413 | goto reconnect; |
5414 | } else if (rv == -EAGAIN) { | |
cb6518cb LE |
5415 | /* If the data socket received something meanwhile, |
5416 | * that is good enough: peer is still alive. */ | |
bde89a9e AG |
5417 | if (time_after(connection->last_received, |
5418 | jiffies - connection->meta.socket->sk->sk_rcvtimeo)) | |
cb6518cb | 5419 | continue; |
f36af18c | 5420 | if (ping_timeout_active) { |
1ec861eb | 5421 | drbd_err(connection, "PingAck did not arrive in time.\n"); |
b411b363 PR |
5422 | goto reconnect; |
5423 | } | |
bde89a9e | 5424 | set_bit(SEND_PING, &connection->flags); |
b411b363 PR |
5425 | continue; |
5426 | } else if (rv == -EINTR) { | |
5427 | continue; | |
5428 | } else { | |
1ec861eb | 5429 | drbd_err(connection, "sock_recvmsg returned %d\n", rv); |
b411b363 PR |
5430 | goto reconnect; |
5431 | } | |
5432 | ||
5433 | if (received == expect && cmd == NULL) { | |
bde89a9e | 5434 | if (decode_header(connection, connection->meta.rbuf, &pi)) |
b411b363 | 5435 | goto reconnect; |
7201b972 | 5436 | cmd = &asender_tbl[pi.cmd]; |
1952e916 | 5437 | if (pi.cmd >= ARRAY_SIZE(asender_tbl) || !cmd->fn) { |
1ec861eb | 5438 | drbd_err(connection, "Unexpected meta packet %s (0x%04x)\n", |
2fcb8f30 | 5439 | cmdname(pi.cmd), pi.cmd); |
b411b363 PR |
5440 | goto disconnect; |
5441 | } | |
e658983a | 5442 | expect = header_size + cmd->pkt_size; |
52b061a4 | 5443 | if (pi.size != expect - header_size) { |
1ec861eb | 5444 | drbd_err(connection, "Wrong packet size on meta (c: %d, l: %d)\n", |
77351055 | 5445 | pi.cmd, pi.size); |
b411b363 | 5446 | goto reconnect; |
257d0af6 | 5447 | } |
b411b363 PR |
5448 | } |
5449 | if (received == expect) { | |
2735a594 | 5450 | bool err; |
a4fbda8e | 5451 | |
bde89a9e | 5452 | err = cmd->fn(connection, &pi); |
2735a594 | 5453 | if (err) { |
1ec861eb | 5454 | drbd_err(connection, "%pf failed\n", cmd->fn); |
b411b363 | 5455 | goto reconnect; |
1952e916 | 5456 | } |
b411b363 | 5457 | |
bde89a9e | 5458 | connection->last_received = jiffies; |
f36af18c | 5459 | |
44ed167d PR |
5460 | if (cmd == &asender_tbl[P_PING_ACK]) { |
5461 | /* restore idle timeout */ | |
bde89a9e | 5462 | connection->meta.socket->sk->sk_rcvtimeo = ping_int * HZ; |
44ed167d PR |
5463 | ping_timeout_active = false; |
5464 | } | |
f36af18c | 5465 | |
bde89a9e | 5466 | buf = connection->meta.rbuf; |
b411b363 | 5467 | received = 0; |
52b061a4 | 5468 | expect = header_size; |
b411b363 PR |
5469 | cmd = NULL; |
5470 | } | |
5471 | } | |
5472 | ||
5473 | if (0) { | |
5474 | reconnect: | |
bde89a9e AG |
5475 | conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD); |
5476 | conn_md_sync(connection); | |
b411b363 PR |
5477 | } |
5478 | if (0) { | |
5479 | disconnect: | |
bde89a9e | 5480 | conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 | 5481 | } |
bde89a9e | 5482 | clear_bit(SIGNAL_ASENDER, &connection->flags); |
b411b363 | 5483 | |
1ec861eb | 5484 | drbd_info(connection, "asender terminated\n"); |
b411b363 PR |
5485 | |
5486 | return 0; | |
5487 | } |