Commit | Line | Data |
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93c68cc4 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
b411b363 PR |
2 | /* |
3 | drbd_receiver.c | |
4 | ||
5 | This file is part of DRBD by Philipp Reisner and Lars Ellenberg. | |
6 | ||
7 | Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. | |
8 | Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>. | |
9 | Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. | |
10 | ||
b411b363 PR |
11 | */ |
12 | ||
13 | ||
b411b363 PR |
14 | #include <linux/module.h> |
15 | ||
7e5fec31 | 16 | #include <linux/uaccess.h> |
b411b363 PR |
17 | #include <net/sock.h> |
18 | ||
b411b363 PR |
19 | #include <linux/drbd.h> |
20 | #include <linux/fs.h> | |
21 | #include <linux/file.h> | |
22 | #include <linux/in.h> | |
23 | #include <linux/mm.h> | |
24 | #include <linux/memcontrol.h> | |
25 | #include <linux/mm_inline.h> | |
26 | #include <linux/slab.h> | |
ae7e81c0 | 27 | #include <uapi/linux/sched/types.h> |
174cd4b1 | 28 | #include <linux/sched/signal.h> |
b411b363 PR |
29 | #include <linux/pkt_sched.h> |
30 | #define __KERNEL_SYSCALLS__ | |
31 | #include <linux/unistd.h> | |
32 | #include <linux/vmalloc.h> | |
33 | #include <linux/random.h> | |
b411b363 PR |
34 | #include <linux/string.h> |
35 | #include <linux/scatterlist.h> | |
c6a564ff | 36 | #include <linux/part_stat.h> |
b411b363 | 37 | #include "drbd_int.h" |
a3603a6e | 38 | #include "drbd_protocol.h" |
b411b363 | 39 | #include "drbd_req.h" |
b411b363 PR |
40 | #include "drbd_vli.h" |
41 | ||
f31e583a | 42 | #define PRO_FEATURES (DRBD_FF_TRIM|DRBD_FF_THIN_RESYNC|DRBD_FF_WSAME|DRBD_FF_WZEROES) |
20c68fde | 43 | |
77351055 PR |
44 | struct packet_info { |
45 | enum drbd_packet cmd; | |
e2857216 AG |
46 | unsigned int size; |
47 | unsigned int vnr; | |
e658983a | 48 | void *data; |
77351055 PR |
49 | }; |
50 | ||
b411b363 PR |
51 | enum finish_epoch { |
52 | FE_STILL_LIVE, | |
53 | FE_DESTROYED, | |
54 | FE_RECYCLED, | |
55 | }; | |
56 | ||
bde89a9e AG |
57 | static int drbd_do_features(struct drbd_connection *connection); |
58 | static int drbd_do_auth(struct drbd_connection *connection); | |
69a22773 | 59 | static int drbd_disconnected(struct drbd_peer_device *); |
a0fb3c47 | 60 | static void conn_wait_active_ee_empty(struct drbd_connection *connection); |
bde89a9e | 61 | static enum finish_epoch drbd_may_finish_epoch(struct drbd_connection *, struct drbd_epoch *, enum epoch_event); |
99920dc5 | 62 | static int e_end_block(struct drbd_work *, int); |
b411b363 | 63 | |
b411b363 PR |
64 | |
65 | #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) | |
66 | ||
45bb912b LE |
67 | /* |
68 | * some helper functions to deal with single linked page lists, | |
69 | * page->private being our "next" pointer. | |
70 | */ | |
71 | ||
72 | /* If at least n pages are linked at head, get n pages off. | |
73 | * Otherwise, don't modify head, and return NULL. | |
74 | * Locking is the responsibility of the caller. | |
75 | */ | |
76 | static struct page *page_chain_del(struct page **head, int n) | |
77 | { | |
78 | struct page *page; | |
79 | struct page *tmp; | |
80 | ||
81 | BUG_ON(!n); | |
82 | BUG_ON(!head); | |
83 | ||
84 | page = *head; | |
23ce4227 PR |
85 | |
86 | if (!page) | |
87 | return NULL; | |
88 | ||
45bb912b LE |
89 | while (page) { |
90 | tmp = page_chain_next(page); | |
91 | if (--n == 0) | |
92 | break; /* found sufficient pages */ | |
93 | if (tmp == NULL) | |
94 | /* insufficient pages, don't use any of them. */ | |
95 | return NULL; | |
96 | page = tmp; | |
97 | } | |
98 | ||
99 | /* add end of list marker for the returned list */ | |
100 | set_page_private(page, 0); | |
101 | /* actual return value, and adjustment of head */ | |
102 | page = *head; | |
103 | *head = tmp; | |
104 | return page; | |
105 | } | |
106 | ||
107 | /* may be used outside of locks to find the tail of a (usually short) | |
108 | * "private" page chain, before adding it back to a global chain head | |
109 | * with page_chain_add() under a spinlock. */ | |
110 | static struct page *page_chain_tail(struct page *page, int *len) | |
111 | { | |
112 | struct page *tmp; | |
113 | int i = 1; | |
e8628013 JP |
114 | while ((tmp = page_chain_next(page))) { |
115 | ++i; | |
116 | page = tmp; | |
117 | } | |
45bb912b LE |
118 | if (len) |
119 | *len = i; | |
120 | return page; | |
121 | } | |
122 | ||
123 | static int page_chain_free(struct page *page) | |
124 | { | |
125 | struct page *tmp; | |
126 | int i = 0; | |
127 | page_chain_for_each_safe(page, tmp) { | |
128 | put_page(page); | |
129 | ++i; | |
130 | } | |
131 | return i; | |
132 | } | |
133 | ||
134 | static void page_chain_add(struct page **head, | |
135 | struct page *chain_first, struct page *chain_last) | |
136 | { | |
137 | #if 1 | |
138 | struct page *tmp; | |
139 | tmp = page_chain_tail(chain_first, NULL); | |
140 | BUG_ON(tmp != chain_last); | |
141 | #endif | |
142 | ||
143 | /* add chain to head */ | |
144 | set_page_private(chain_last, (unsigned long)*head); | |
145 | *head = chain_first; | |
146 | } | |
147 | ||
b30ab791 | 148 | static struct page *__drbd_alloc_pages(struct drbd_device *device, |
18c2d522 | 149 | unsigned int number) |
b411b363 PR |
150 | { |
151 | struct page *page = NULL; | |
45bb912b | 152 | struct page *tmp = NULL; |
18c2d522 | 153 | unsigned int i = 0; |
b411b363 PR |
154 | |
155 | /* Yes, testing drbd_pp_vacant outside the lock is racy. | |
156 | * So what. It saves a spin_lock. */ | |
45bb912b | 157 | if (drbd_pp_vacant >= number) { |
b411b363 | 158 | spin_lock(&drbd_pp_lock); |
45bb912b LE |
159 | page = page_chain_del(&drbd_pp_pool, number); |
160 | if (page) | |
161 | drbd_pp_vacant -= number; | |
b411b363 | 162 | spin_unlock(&drbd_pp_lock); |
45bb912b LE |
163 | if (page) |
164 | return page; | |
b411b363 | 165 | } |
45bb912b | 166 | |
b411b363 PR |
167 | /* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD |
168 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
169 | * which in turn might block on the other node at this very place. */ | |
45bb912b LE |
170 | for (i = 0; i < number; i++) { |
171 | tmp = alloc_page(GFP_TRY); | |
172 | if (!tmp) | |
173 | break; | |
174 | set_page_private(tmp, (unsigned long)page); | |
175 | page = tmp; | |
176 | } | |
177 | ||
178 | if (i == number) | |
179 | return page; | |
180 | ||
181 | /* Not enough pages immediately available this time. | |
c37c8ecf | 182 | * No need to jump around here, drbd_alloc_pages will retry this |
45bb912b LE |
183 | * function "soon". */ |
184 | if (page) { | |
185 | tmp = page_chain_tail(page, NULL); | |
186 | spin_lock(&drbd_pp_lock); | |
187 | page_chain_add(&drbd_pp_pool, page, tmp); | |
188 | drbd_pp_vacant += i; | |
189 | spin_unlock(&drbd_pp_lock); | |
190 | } | |
191 | return NULL; | |
b411b363 PR |
192 | } |
193 | ||
b30ab791 | 194 | static void reclaim_finished_net_peer_reqs(struct drbd_device *device, |
a990be46 | 195 | struct list_head *to_be_freed) |
b411b363 | 196 | { |
a8cd15ba | 197 | struct drbd_peer_request *peer_req, *tmp; |
b411b363 PR |
198 | |
199 | /* The EEs are always appended to the end of the list. Since | |
200 | they are sent in order over the wire, they have to finish | |
201 | in order. As soon as we see the first not finished we can | |
202 | stop to examine the list... */ | |
203 | ||
a8cd15ba | 204 | list_for_each_entry_safe(peer_req, tmp, &device->net_ee, w.list) { |
045417f7 | 205 | if (drbd_peer_req_has_active_page(peer_req)) |
b411b363 | 206 | break; |
a8cd15ba | 207 | list_move(&peer_req->w.list, to_be_freed); |
b411b363 PR |
208 | } |
209 | } | |
210 | ||
668700b4 | 211 | static void drbd_reclaim_net_peer_reqs(struct drbd_device *device) |
b411b363 PR |
212 | { |
213 | LIST_HEAD(reclaimed); | |
db830c46 | 214 | struct drbd_peer_request *peer_req, *t; |
b411b363 | 215 | |
0500813f | 216 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 | 217 | reclaim_finished_net_peer_reqs(device, &reclaimed); |
0500813f | 218 | spin_unlock_irq(&device->resource->req_lock); |
a8cd15ba | 219 | list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) |
b30ab791 | 220 | drbd_free_net_peer_req(device, peer_req); |
b411b363 PR |
221 | } |
222 | ||
668700b4 PR |
223 | static void conn_reclaim_net_peer_reqs(struct drbd_connection *connection) |
224 | { | |
225 | struct drbd_peer_device *peer_device; | |
226 | int vnr; | |
227 | ||
228 | rcu_read_lock(); | |
229 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { | |
230 | struct drbd_device *device = peer_device->device; | |
231 | if (!atomic_read(&device->pp_in_use_by_net)) | |
232 | continue; | |
233 | ||
234 | kref_get(&device->kref); | |
235 | rcu_read_unlock(); | |
236 | drbd_reclaim_net_peer_reqs(device); | |
237 | kref_put(&device->kref, drbd_destroy_device); | |
238 | rcu_read_lock(); | |
239 | } | |
240 | rcu_read_unlock(); | |
241 | } | |
242 | ||
b411b363 | 243 | /** |
c37c8ecf | 244 | * drbd_alloc_pages() - Returns @number pages, retries forever (or until signalled) |
9b48ff07 LJ |
245 | * @peer_device: DRBD device. |
246 | * @number: number of pages requested | |
247 | * @retry: whether to retry, if not enough pages are available right now | |
45bb912b LE |
248 | * |
249 | * Tries to allocate number pages, first from our own page pool, then from | |
0e49d7b0 | 250 | * the kernel. |
45bb912b | 251 | * Possibly retry until DRBD frees sufficient pages somewhere else. |
b411b363 | 252 | * |
0e49d7b0 LE |
253 | * If this allocation would exceed the max_buffers setting, we throttle |
254 | * allocation (schedule_timeout) to give the system some room to breathe. | |
255 | * | |
256 | * We do not use max-buffers as hard limit, because it could lead to | |
257 | * congestion and further to a distributed deadlock during online-verify or | |
258 | * (checksum based) resync, if the max-buffers, socket buffer sizes and | |
259 | * resync-rate settings are mis-configured. | |
260 | * | |
45bb912b | 261 | * Returns a page chain linked via page->private. |
b411b363 | 262 | */ |
69a22773 | 263 | struct page *drbd_alloc_pages(struct drbd_peer_device *peer_device, unsigned int number, |
c37c8ecf | 264 | bool retry) |
b411b363 | 265 | { |
69a22773 | 266 | struct drbd_device *device = peer_device->device; |
b411b363 | 267 | struct page *page = NULL; |
44ed167d | 268 | struct net_conf *nc; |
b411b363 | 269 | DEFINE_WAIT(wait); |
0e49d7b0 | 270 | unsigned int mxb; |
b411b363 | 271 | |
44ed167d | 272 | rcu_read_lock(); |
69a22773 | 273 | nc = rcu_dereference(peer_device->connection->net_conf); |
44ed167d PR |
274 | mxb = nc ? nc->max_buffers : 1000000; |
275 | rcu_read_unlock(); | |
276 | ||
b30ab791 AG |
277 | if (atomic_read(&device->pp_in_use) < mxb) |
278 | page = __drbd_alloc_pages(device, number); | |
b411b363 | 279 | |
668700b4 PR |
280 | /* Try to keep the fast path fast, but occasionally we need |
281 | * to reclaim the pages we lended to the network stack. */ | |
282 | if (page && atomic_read(&device->pp_in_use_by_net) > 512) | |
283 | drbd_reclaim_net_peer_reqs(device); | |
284 | ||
45bb912b | 285 | while (page == NULL) { |
b411b363 PR |
286 | prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE); |
287 | ||
668700b4 | 288 | drbd_reclaim_net_peer_reqs(device); |
b411b363 | 289 | |
b30ab791 AG |
290 | if (atomic_read(&device->pp_in_use) < mxb) { |
291 | page = __drbd_alloc_pages(device, number); | |
b411b363 PR |
292 | if (page) |
293 | break; | |
294 | } | |
295 | ||
296 | if (!retry) | |
297 | break; | |
298 | ||
299 | if (signal_pending(current)) { | |
d0180171 | 300 | drbd_warn(device, "drbd_alloc_pages interrupted!\n"); |
b411b363 PR |
301 | break; |
302 | } | |
303 | ||
0e49d7b0 LE |
304 | if (schedule_timeout(HZ/10) == 0) |
305 | mxb = UINT_MAX; | |
b411b363 PR |
306 | } |
307 | finish_wait(&drbd_pp_wait, &wait); | |
308 | ||
45bb912b | 309 | if (page) |
b30ab791 | 310 | atomic_add(number, &device->pp_in_use); |
b411b363 PR |
311 | return page; |
312 | } | |
313 | ||
c37c8ecf | 314 | /* Must not be used from irq, as that may deadlock: see drbd_alloc_pages. |
0500813f | 315 | * Is also used from inside an other spin_lock_irq(&resource->req_lock); |
45bb912b LE |
316 | * Either links the page chain back to the global pool, |
317 | * or returns all pages to the system. */ | |
b30ab791 | 318 | static void drbd_free_pages(struct drbd_device *device, struct page *page, int is_net) |
b411b363 | 319 | { |
b30ab791 | 320 | atomic_t *a = is_net ? &device->pp_in_use_by_net : &device->pp_in_use; |
b411b363 | 321 | int i; |
435f0740 | 322 | |
a73ff323 LE |
323 | if (page == NULL) |
324 | return; | |
325 | ||
183ece30 | 326 | if (drbd_pp_vacant > (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * drbd_minor_count) |
45bb912b LE |
327 | i = page_chain_free(page); |
328 | else { | |
329 | struct page *tmp; | |
330 | tmp = page_chain_tail(page, &i); | |
331 | spin_lock(&drbd_pp_lock); | |
332 | page_chain_add(&drbd_pp_pool, page, tmp); | |
333 | drbd_pp_vacant += i; | |
334 | spin_unlock(&drbd_pp_lock); | |
b411b363 | 335 | } |
435f0740 | 336 | i = atomic_sub_return(i, a); |
45bb912b | 337 | if (i < 0) |
d0180171 | 338 | drbd_warn(device, "ASSERTION FAILED: %s: %d < 0\n", |
435f0740 | 339 | is_net ? "pp_in_use_by_net" : "pp_in_use", i); |
b411b363 PR |
340 | wake_up(&drbd_pp_wait); |
341 | } | |
342 | ||
343 | /* | |
344 | You need to hold the req_lock: | |
345 | _drbd_wait_ee_list_empty() | |
346 | ||
347 | You must not have the req_lock: | |
3967deb1 | 348 | drbd_free_peer_req() |
0db55363 | 349 | drbd_alloc_peer_req() |
7721f567 | 350 | drbd_free_peer_reqs() |
b411b363 | 351 | drbd_ee_fix_bhs() |
a990be46 | 352 | drbd_finish_peer_reqs() |
b411b363 PR |
353 | drbd_clear_done_ee() |
354 | drbd_wait_ee_list_empty() | |
355 | */ | |
356 | ||
9104d31a LE |
357 | /* normal: payload_size == request size (bi_size) |
358 | * w_same: payload_size == logical_block_size | |
359 | * trim: payload_size == 0 */ | |
f6ffca9f | 360 | struct drbd_peer_request * |
69a22773 | 361 | drbd_alloc_peer_req(struct drbd_peer_device *peer_device, u64 id, sector_t sector, |
9104d31a | 362 | unsigned int request_size, unsigned int payload_size, gfp_t gfp_mask) __must_hold(local) |
b411b363 | 363 | { |
69a22773 | 364 | struct drbd_device *device = peer_device->device; |
db830c46 | 365 | struct drbd_peer_request *peer_req; |
a73ff323 | 366 | struct page *page = NULL; |
e6be38a1 | 367 | unsigned int nr_pages = PFN_UP(payload_size); |
b411b363 | 368 | |
b30ab791 | 369 | if (drbd_insert_fault(device, DRBD_FAULT_AL_EE)) |
b411b363 PR |
370 | return NULL; |
371 | ||
0892fac8 | 372 | peer_req = mempool_alloc(&drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM); |
db830c46 | 373 | if (!peer_req) { |
b411b363 | 374 | if (!(gfp_mask & __GFP_NOWARN)) |
d0180171 | 375 | drbd_err(device, "%s: allocation failed\n", __func__); |
b411b363 PR |
376 | return NULL; |
377 | } | |
378 | ||
9104d31a | 379 | if (nr_pages) { |
d0164adc MG |
380 | page = drbd_alloc_pages(peer_device, nr_pages, |
381 | gfpflags_allow_blocking(gfp_mask)); | |
a73ff323 LE |
382 | if (!page) |
383 | goto fail; | |
384 | } | |
b411b363 | 385 | |
c5a2c150 LE |
386 | memset(peer_req, 0, sizeof(*peer_req)); |
387 | INIT_LIST_HEAD(&peer_req->w.list); | |
db830c46 | 388 | drbd_clear_interval(&peer_req->i); |
9104d31a | 389 | peer_req->i.size = request_size; |
db830c46 | 390 | peer_req->i.sector = sector; |
c5a2c150 | 391 | peer_req->submit_jif = jiffies; |
a8cd15ba | 392 | peer_req->peer_device = peer_device; |
db830c46 | 393 | peer_req->pages = page; |
9a8e7753 AG |
394 | /* |
395 | * The block_id is opaque to the receiver. It is not endianness | |
396 | * converted, and sent back to the sender unchanged. | |
397 | */ | |
db830c46 | 398 | peer_req->block_id = id; |
b411b363 | 399 | |
db830c46 | 400 | return peer_req; |
b411b363 | 401 | |
45bb912b | 402 | fail: |
0892fac8 | 403 | mempool_free(peer_req, &drbd_ee_mempool); |
b411b363 PR |
404 | return NULL; |
405 | } | |
406 | ||
b30ab791 | 407 | void __drbd_free_peer_req(struct drbd_device *device, struct drbd_peer_request *peer_req, |
f6ffca9f | 408 | int is_net) |
b411b363 | 409 | { |
21ae5d7f | 410 | might_sleep(); |
db830c46 AG |
411 | if (peer_req->flags & EE_HAS_DIGEST) |
412 | kfree(peer_req->digest); | |
b30ab791 | 413 | drbd_free_pages(device, peer_req->pages, is_net); |
0b0ba1ef AG |
414 | D_ASSERT(device, atomic_read(&peer_req->pending_bios) == 0); |
415 | D_ASSERT(device, drbd_interval_empty(&peer_req->i)); | |
677b3672 | 416 | if (!expect(device, !(peer_req->flags & EE_CALL_AL_COMPLETE_IO))) { |
21ae5d7f LE |
417 | peer_req->flags &= ~EE_CALL_AL_COMPLETE_IO; |
418 | drbd_al_complete_io(device, &peer_req->i); | |
419 | } | |
0892fac8 | 420 | mempool_free(peer_req, &drbd_ee_mempool); |
b411b363 PR |
421 | } |
422 | ||
b30ab791 | 423 | int drbd_free_peer_reqs(struct drbd_device *device, struct list_head *list) |
b411b363 PR |
424 | { |
425 | LIST_HEAD(work_list); | |
db830c46 | 426 | struct drbd_peer_request *peer_req, *t; |
b411b363 | 427 | int count = 0; |
b30ab791 | 428 | int is_net = list == &device->net_ee; |
b411b363 | 429 | |
0500813f | 430 | spin_lock_irq(&device->resource->req_lock); |
b411b363 | 431 | list_splice_init(list, &work_list); |
0500813f | 432 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 | 433 | |
a8cd15ba | 434 | list_for_each_entry_safe(peer_req, t, &work_list, w.list) { |
b30ab791 | 435 | __drbd_free_peer_req(device, peer_req, is_net); |
b411b363 PR |
436 | count++; |
437 | } | |
438 | return count; | |
439 | } | |
440 | ||
b411b363 | 441 | /* |
a990be46 | 442 | * See also comments in _req_mod(,BARRIER_ACKED) and receive_Barrier. |
b411b363 | 443 | */ |
b30ab791 | 444 | static int drbd_finish_peer_reqs(struct drbd_device *device) |
b411b363 PR |
445 | { |
446 | LIST_HEAD(work_list); | |
447 | LIST_HEAD(reclaimed); | |
db830c46 | 448 | struct drbd_peer_request *peer_req, *t; |
e2b3032b | 449 | int err = 0; |
b411b363 | 450 | |
0500813f | 451 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 AG |
452 | reclaim_finished_net_peer_reqs(device, &reclaimed); |
453 | list_splice_init(&device->done_ee, &work_list); | |
0500813f | 454 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 | 455 | |
a8cd15ba | 456 | list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) |
b30ab791 | 457 | drbd_free_net_peer_req(device, peer_req); |
b411b363 PR |
458 | |
459 | /* possible callbacks here: | |
d4dabbe2 | 460 | * e_end_block, and e_end_resync_block, e_send_superseded. |
b411b363 PR |
461 | * all ignore the last argument. |
462 | */ | |
a8cd15ba | 463 | list_for_each_entry_safe(peer_req, t, &work_list, w.list) { |
e2b3032b AG |
464 | int err2; |
465 | ||
b411b363 | 466 | /* list_del not necessary, next/prev members not touched */ |
a8cd15ba | 467 | err2 = peer_req->w.cb(&peer_req->w, !!err); |
e2b3032b AG |
468 | if (!err) |
469 | err = err2; | |
b30ab791 | 470 | drbd_free_peer_req(device, peer_req); |
b411b363 | 471 | } |
b30ab791 | 472 | wake_up(&device->ee_wait); |
b411b363 | 473 | |
e2b3032b | 474 | return err; |
b411b363 PR |
475 | } |
476 | ||
b30ab791 | 477 | static void _drbd_wait_ee_list_empty(struct drbd_device *device, |
d4da1537 | 478 | struct list_head *head) |
b411b363 PR |
479 | { |
480 | DEFINE_WAIT(wait); | |
481 | ||
482 | /* avoids spin_lock/unlock | |
483 | * and calling prepare_to_wait in the fast path */ | |
484 | while (!list_empty(head)) { | |
b30ab791 | 485 | prepare_to_wait(&device->ee_wait, &wait, TASK_UNINTERRUPTIBLE); |
0500813f | 486 | spin_unlock_irq(&device->resource->req_lock); |
7eaceacc | 487 | io_schedule(); |
b30ab791 | 488 | finish_wait(&device->ee_wait, &wait); |
0500813f | 489 | spin_lock_irq(&device->resource->req_lock); |
b411b363 PR |
490 | } |
491 | } | |
492 | ||
b30ab791 | 493 | static void drbd_wait_ee_list_empty(struct drbd_device *device, |
d4da1537 | 494 | struct list_head *head) |
b411b363 | 495 | { |
0500813f | 496 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 | 497 | _drbd_wait_ee_list_empty(device, head); |
0500813f | 498 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 PR |
499 | } |
500 | ||
dbd9eea0 | 501 | static int drbd_recv_short(struct socket *sock, void *buf, size_t size, int flags) |
b411b363 | 502 | { |
b411b363 PR |
503 | struct kvec iov = { |
504 | .iov_base = buf, | |
505 | .iov_len = size, | |
506 | }; | |
507 | struct msghdr msg = { | |
b411b363 PR |
508 | .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) |
509 | }; | |
de4eda9d | 510 | iov_iter_kvec(&msg.msg_iter, ITER_DEST, &iov, 1, size); |
f7765c36 | 511 | return sock_recvmsg(sock, &msg, msg.msg_flags); |
b411b363 PR |
512 | } |
513 | ||
bde89a9e | 514 | static int drbd_recv(struct drbd_connection *connection, void *buf, size_t size) |
b411b363 | 515 | { |
b411b363 PR |
516 | int rv; |
517 | ||
bde89a9e | 518 | rv = drbd_recv_short(connection->data.socket, buf, size, 0); |
b411b363 | 519 | |
dbd0820c PR |
520 | if (rv < 0) { |
521 | if (rv == -ECONNRESET) | |
1ec861eb | 522 | drbd_info(connection, "sock was reset by peer\n"); |
dbd0820c | 523 | else if (rv != -ERESTARTSYS) |
1ec861eb | 524 | drbd_err(connection, "sock_recvmsg returned %d\n", rv); |
dbd0820c | 525 | } else if (rv == 0) { |
bde89a9e | 526 | if (test_bit(DISCONNECT_SENT, &connection->flags)) { |
b66623e3 PR |
527 | long t; |
528 | rcu_read_lock(); | |
bde89a9e | 529 | t = rcu_dereference(connection->net_conf)->ping_timeo * HZ/10; |
b66623e3 PR |
530 | rcu_read_unlock(); |
531 | ||
bde89a9e | 532 | t = wait_event_timeout(connection->ping_wait, connection->cstate < C_WF_REPORT_PARAMS, t); |
b66623e3 | 533 | |
599377ac PR |
534 | if (t) |
535 | goto out; | |
536 | } | |
1ec861eb | 537 | drbd_info(connection, "sock was shut down by peer\n"); |
599377ac PR |
538 | } |
539 | ||
b411b363 | 540 | if (rv != size) |
bde89a9e | 541 | conn_request_state(connection, NS(conn, C_BROKEN_PIPE), CS_HARD); |
b411b363 | 542 | |
599377ac | 543 | out: |
b411b363 PR |
544 | return rv; |
545 | } | |
546 | ||
bde89a9e | 547 | static int drbd_recv_all(struct drbd_connection *connection, void *buf, size_t size) |
c6967746 AG |
548 | { |
549 | int err; | |
550 | ||
bde89a9e | 551 | err = drbd_recv(connection, buf, size); |
c6967746 AG |
552 | if (err != size) { |
553 | if (err >= 0) | |
554 | err = -EIO; | |
555 | } else | |
556 | err = 0; | |
557 | return err; | |
558 | } | |
559 | ||
bde89a9e | 560 | static int drbd_recv_all_warn(struct drbd_connection *connection, void *buf, size_t size) |
a5c31904 AG |
561 | { |
562 | int err; | |
563 | ||
bde89a9e | 564 | err = drbd_recv_all(connection, buf, size); |
a5c31904 | 565 | if (err && !signal_pending(current)) |
1ec861eb | 566 | drbd_warn(connection, "short read (expected size %d)\n", (int)size); |
a5c31904 AG |
567 | return err; |
568 | } | |
569 | ||
5dbf1673 LE |
570 | /* quoting tcp(7): |
571 | * On individual connections, the socket buffer size must be set prior to the | |
572 | * listen(2) or connect(2) calls in order to have it take effect. | |
573 | * This is our wrapper to do so. | |
574 | */ | |
575 | static void drbd_setbufsize(struct socket *sock, unsigned int snd, | |
576 | unsigned int rcv) | |
577 | { | |
578 | /* open coded SO_SNDBUF, SO_RCVBUF */ | |
579 | if (snd) { | |
580 | sock->sk->sk_sndbuf = snd; | |
581 | sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; | |
582 | } | |
583 | if (rcv) { | |
584 | sock->sk->sk_rcvbuf = rcv; | |
585 | sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; | |
586 | } | |
587 | } | |
588 | ||
bde89a9e | 589 | static struct socket *drbd_try_connect(struct drbd_connection *connection) |
b411b363 PR |
590 | { |
591 | const char *what; | |
592 | struct socket *sock; | |
593 | struct sockaddr_in6 src_in6; | |
44ed167d PR |
594 | struct sockaddr_in6 peer_in6; |
595 | struct net_conf *nc; | |
596 | int err, peer_addr_len, my_addr_len; | |
69ef82de | 597 | int sndbuf_size, rcvbuf_size, connect_int; |
b411b363 PR |
598 | int disconnect_on_error = 1; |
599 | ||
44ed167d | 600 | rcu_read_lock(); |
bde89a9e | 601 | nc = rcu_dereference(connection->net_conf); |
44ed167d PR |
602 | if (!nc) { |
603 | rcu_read_unlock(); | |
b411b363 | 604 | return NULL; |
44ed167d | 605 | } |
44ed167d PR |
606 | sndbuf_size = nc->sndbuf_size; |
607 | rcvbuf_size = nc->rcvbuf_size; | |
69ef82de | 608 | connect_int = nc->connect_int; |
089c075d | 609 | rcu_read_unlock(); |
44ed167d | 610 | |
bde89a9e AG |
611 | my_addr_len = min_t(int, connection->my_addr_len, sizeof(src_in6)); |
612 | memcpy(&src_in6, &connection->my_addr, my_addr_len); | |
44ed167d | 613 | |
bde89a9e | 614 | if (((struct sockaddr *)&connection->my_addr)->sa_family == AF_INET6) |
44ed167d PR |
615 | src_in6.sin6_port = 0; |
616 | else | |
617 | ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ | |
618 | ||
bde89a9e AG |
619 | peer_addr_len = min_t(int, connection->peer_addr_len, sizeof(src_in6)); |
620 | memcpy(&peer_in6, &connection->peer_addr, peer_addr_len); | |
b411b363 PR |
621 | |
622 | what = "sock_create_kern"; | |
eeb1bd5c | 623 | err = sock_create_kern(&init_net, ((struct sockaddr *)&src_in6)->sa_family, |
44ed167d | 624 | SOCK_STREAM, IPPROTO_TCP, &sock); |
b411b363 PR |
625 | if (err < 0) { |
626 | sock = NULL; | |
627 | goto out; | |
628 | } | |
629 | ||
630 | sock->sk->sk_rcvtimeo = | |
69ef82de | 631 | sock->sk->sk_sndtimeo = connect_int * HZ; |
44ed167d | 632 | drbd_setbufsize(sock, sndbuf_size, rcvbuf_size); |
b411b363 PR |
633 | |
634 | /* explicitly bind to the configured IP as source IP | |
635 | * for the outgoing connections. | |
636 | * This is needed for multihomed hosts and to be | |
637 | * able to use lo: interfaces for drbd. | |
638 | * Make sure to use 0 as port number, so linux selects | |
639 | * a free one dynamically. | |
640 | */ | |
b411b363 | 641 | what = "bind before connect"; |
44ed167d | 642 | err = sock->ops->bind(sock, (struct sockaddr *) &src_in6, my_addr_len); |
b411b363 PR |
643 | if (err < 0) |
644 | goto out; | |
645 | ||
646 | /* connect may fail, peer not yet available. | |
647 | * stay C_WF_CONNECTION, don't go Disconnecting! */ | |
648 | disconnect_on_error = 0; | |
649 | what = "connect"; | |
44ed167d | 650 | err = sock->ops->connect(sock, (struct sockaddr *) &peer_in6, peer_addr_len, 0); |
b411b363 PR |
651 | |
652 | out: | |
653 | if (err < 0) { | |
654 | if (sock) { | |
655 | sock_release(sock); | |
656 | sock = NULL; | |
657 | } | |
658 | switch (-err) { | |
659 | /* timeout, busy, signal pending */ | |
660 | case ETIMEDOUT: case EAGAIN: case EINPROGRESS: | |
661 | case EINTR: case ERESTARTSYS: | |
662 | /* peer not (yet) available, network problem */ | |
663 | case ECONNREFUSED: case ENETUNREACH: | |
664 | case EHOSTDOWN: case EHOSTUNREACH: | |
665 | disconnect_on_error = 0; | |
666 | break; | |
667 | default: | |
1ec861eb | 668 | drbd_err(connection, "%s failed, err = %d\n", what, err); |
b411b363 PR |
669 | } |
670 | if (disconnect_on_error) | |
bde89a9e | 671 | conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 | 672 | } |
44ed167d | 673 | |
b411b363 PR |
674 | return sock; |
675 | } | |
676 | ||
7a426fd8 | 677 | struct accept_wait_data { |
bde89a9e | 678 | struct drbd_connection *connection; |
7a426fd8 PR |
679 | struct socket *s_listen; |
680 | struct completion door_bell; | |
681 | void (*original_sk_state_change)(struct sock *sk); | |
682 | ||
683 | }; | |
684 | ||
715306f6 | 685 | static void drbd_incoming_connection(struct sock *sk) |
7a426fd8 PR |
686 | { |
687 | struct accept_wait_data *ad = sk->sk_user_data; | |
715306f6 | 688 | void (*state_change)(struct sock *sk); |
7a426fd8 | 689 | |
715306f6 AG |
690 | state_change = ad->original_sk_state_change; |
691 | if (sk->sk_state == TCP_ESTABLISHED) | |
692 | complete(&ad->door_bell); | |
693 | state_change(sk); | |
7a426fd8 PR |
694 | } |
695 | ||
bde89a9e | 696 | static int prepare_listen_socket(struct drbd_connection *connection, struct accept_wait_data *ad) |
b411b363 | 697 | { |
1f3e509b | 698 | int err, sndbuf_size, rcvbuf_size, my_addr_len; |
44ed167d | 699 | struct sockaddr_in6 my_addr; |
1f3e509b | 700 | struct socket *s_listen; |
44ed167d | 701 | struct net_conf *nc; |
b411b363 PR |
702 | const char *what; |
703 | ||
44ed167d | 704 | rcu_read_lock(); |
bde89a9e | 705 | nc = rcu_dereference(connection->net_conf); |
44ed167d PR |
706 | if (!nc) { |
707 | rcu_read_unlock(); | |
7a426fd8 | 708 | return -EIO; |
44ed167d | 709 | } |
44ed167d PR |
710 | sndbuf_size = nc->sndbuf_size; |
711 | rcvbuf_size = nc->rcvbuf_size; | |
44ed167d | 712 | rcu_read_unlock(); |
b411b363 | 713 | |
bde89a9e AG |
714 | my_addr_len = min_t(int, connection->my_addr_len, sizeof(struct sockaddr_in6)); |
715 | memcpy(&my_addr, &connection->my_addr, my_addr_len); | |
b411b363 PR |
716 | |
717 | what = "sock_create_kern"; | |
eeb1bd5c | 718 | err = sock_create_kern(&init_net, ((struct sockaddr *)&my_addr)->sa_family, |
1f3e509b | 719 | SOCK_STREAM, IPPROTO_TCP, &s_listen); |
b411b363 PR |
720 | if (err) { |
721 | s_listen = NULL; | |
722 | goto out; | |
723 | } | |
724 | ||
98683650 | 725 | s_listen->sk->sk_reuse = SK_CAN_REUSE; /* SO_REUSEADDR */ |
44ed167d | 726 | drbd_setbufsize(s_listen, sndbuf_size, rcvbuf_size); |
b411b363 PR |
727 | |
728 | what = "bind before listen"; | |
44ed167d | 729 | err = s_listen->ops->bind(s_listen, (struct sockaddr *)&my_addr, my_addr_len); |
b411b363 PR |
730 | if (err < 0) |
731 | goto out; | |
732 | ||
7a426fd8 PR |
733 | ad->s_listen = s_listen; |
734 | write_lock_bh(&s_listen->sk->sk_callback_lock); | |
735 | ad->original_sk_state_change = s_listen->sk->sk_state_change; | |
715306f6 | 736 | s_listen->sk->sk_state_change = drbd_incoming_connection; |
7a426fd8 PR |
737 | s_listen->sk->sk_user_data = ad; |
738 | write_unlock_bh(&s_listen->sk->sk_callback_lock); | |
b411b363 | 739 | |
2820fd39 PR |
740 | what = "listen"; |
741 | err = s_listen->ops->listen(s_listen, 5); | |
742 | if (err < 0) | |
743 | goto out; | |
744 | ||
7a426fd8 | 745 | return 0; |
b411b363 PR |
746 | out: |
747 | if (s_listen) | |
748 | sock_release(s_listen); | |
749 | if (err < 0) { | |
750 | if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { | |
1ec861eb | 751 | drbd_err(connection, "%s failed, err = %d\n", what, err); |
bde89a9e | 752 | conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 PR |
753 | } |
754 | } | |
b411b363 | 755 | |
7a426fd8 | 756 | return -EIO; |
b411b363 PR |
757 | } |
758 | ||
715306f6 | 759 | static void unregister_state_change(struct sock *sk, struct accept_wait_data *ad) |
b411b363 | 760 | { |
715306f6 AG |
761 | write_lock_bh(&sk->sk_callback_lock); |
762 | sk->sk_state_change = ad->original_sk_state_change; | |
763 | sk->sk_user_data = NULL; | |
764 | write_unlock_bh(&sk->sk_callback_lock); | |
b411b363 PR |
765 | } |
766 | ||
bde89a9e | 767 | static struct socket *drbd_wait_for_connect(struct drbd_connection *connection, struct accept_wait_data *ad) |
b411b363 | 768 | { |
1f3e509b PR |
769 | int timeo, connect_int, err = 0; |
770 | struct socket *s_estab = NULL; | |
1f3e509b PR |
771 | struct net_conf *nc; |
772 | ||
773 | rcu_read_lock(); | |
bde89a9e | 774 | nc = rcu_dereference(connection->net_conf); |
1f3e509b PR |
775 | if (!nc) { |
776 | rcu_read_unlock(); | |
777 | return NULL; | |
778 | } | |
779 | connect_int = nc->connect_int; | |
780 | rcu_read_unlock(); | |
781 | ||
782 | timeo = connect_int * HZ; | |
38b682b2 | 783 | /* 28.5% random jitter */ |
8032bf12 | 784 | timeo += get_random_u32_below(2) ? timeo / 7 : -timeo / 7; |
1f3e509b | 785 | |
7a426fd8 PR |
786 | err = wait_for_completion_interruptible_timeout(&ad->door_bell, timeo); |
787 | if (err <= 0) | |
788 | return NULL; | |
b411b363 | 789 | |
7a426fd8 | 790 | err = kernel_accept(ad->s_listen, &s_estab, 0); |
b411b363 PR |
791 | if (err < 0) { |
792 | if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { | |
1ec861eb | 793 | drbd_err(connection, "accept failed, err = %d\n", err); |
bde89a9e | 794 | conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 PR |
795 | } |
796 | } | |
b411b363 | 797 | |
715306f6 AG |
798 | if (s_estab) |
799 | unregister_state_change(s_estab->sk, ad); | |
b411b363 | 800 | |
b411b363 PR |
801 | return s_estab; |
802 | } | |
b411b363 | 803 | |
bde89a9e | 804 | static int decode_header(struct drbd_connection *, void *, struct packet_info *); |
b411b363 | 805 | |
bde89a9e | 806 | static int send_first_packet(struct drbd_connection *connection, struct drbd_socket *sock, |
9f5bdc33 AG |
807 | enum drbd_packet cmd) |
808 | { | |
bde89a9e | 809 | if (!conn_prepare_command(connection, sock)) |
9f5bdc33 | 810 | return -EIO; |
bde89a9e | 811 | return conn_send_command(connection, sock, cmd, 0, NULL, 0); |
b411b363 PR |
812 | } |
813 | ||
bde89a9e | 814 | static int receive_first_packet(struct drbd_connection *connection, struct socket *sock) |
b411b363 | 815 | { |
bde89a9e | 816 | unsigned int header_size = drbd_header_size(connection); |
9f5bdc33 | 817 | struct packet_info pi; |
4920e37a | 818 | struct net_conf *nc; |
9f5bdc33 | 819 | int err; |
b411b363 | 820 | |
4920e37a PR |
821 | rcu_read_lock(); |
822 | nc = rcu_dereference(connection->net_conf); | |
823 | if (!nc) { | |
824 | rcu_read_unlock(); | |
825 | return -EIO; | |
826 | } | |
827 | sock->sk->sk_rcvtimeo = nc->ping_timeo * 4 * HZ / 10; | |
828 | rcu_read_unlock(); | |
829 | ||
bde89a9e | 830 | err = drbd_recv_short(sock, connection->data.rbuf, header_size, 0); |
9f5bdc33 AG |
831 | if (err != header_size) { |
832 | if (err >= 0) | |
833 | err = -EIO; | |
834 | return err; | |
835 | } | |
bde89a9e | 836 | err = decode_header(connection, connection->data.rbuf, &pi); |
9f5bdc33 AG |
837 | if (err) |
838 | return err; | |
839 | return pi.cmd; | |
b411b363 PR |
840 | } |
841 | ||
842 | /** | |
843 | * drbd_socket_okay() - Free the socket if its connection is not okay | |
b411b363 PR |
844 | * @sock: pointer to the pointer to the socket. |
845 | */ | |
5d0b17f1 | 846 | static bool drbd_socket_okay(struct socket **sock) |
b411b363 PR |
847 | { |
848 | int rr; | |
849 | char tb[4]; | |
850 | ||
851 | if (!*sock) | |
81e84650 | 852 | return false; |
b411b363 | 853 | |
dbd9eea0 | 854 | rr = drbd_recv_short(*sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); |
b411b363 PR |
855 | |
856 | if (rr > 0 || rr == -EAGAIN) { | |
81e84650 | 857 | return true; |
b411b363 PR |
858 | } else { |
859 | sock_release(*sock); | |
860 | *sock = NULL; | |
81e84650 | 861 | return false; |
b411b363 PR |
862 | } |
863 | } | |
5d0b17f1 PR |
864 | |
865 | static bool connection_established(struct drbd_connection *connection, | |
866 | struct socket **sock1, | |
867 | struct socket **sock2) | |
868 | { | |
869 | struct net_conf *nc; | |
870 | int timeout; | |
871 | bool ok; | |
872 | ||
873 | if (!*sock1 || !*sock2) | |
874 | return false; | |
875 | ||
876 | rcu_read_lock(); | |
877 | nc = rcu_dereference(connection->net_conf); | |
878 | timeout = (nc->sock_check_timeo ?: nc->ping_timeo) * HZ / 10; | |
879 | rcu_read_unlock(); | |
880 | schedule_timeout_interruptible(timeout); | |
881 | ||
882 | ok = drbd_socket_okay(sock1); | |
883 | ok = drbd_socket_okay(sock2) && ok; | |
884 | ||
885 | return ok; | |
886 | } | |
887 | ||
2325eb66 PR |
888 | /* Gets called if a connection is established, or if a new minor gets created |
889 | in a connection */ | |
69a22773 | 890 | int drbd_connected(struct drbd_peer_device *peer_device) |
907599e0 | 891 | { |
69a22773 | 892 | struct drbd_device *device = peer_device->device; |
0829f5ed | 893 | int err; |
907599e0 | 894 | |
b30ab791 AG |
895 | atomic_set(&device->packet_seq, 0); |
896 | device->peer_seq = 0; | |
907599e0 | 897 | |
69a22773 AG |
898 | device->state_mutex = peer_device->connection->agreed_pro_version < 100 ? |
899 | &peer_device->connection->cstate_mutex : | |
b30ab791 | 900 | &device->own_state_mutex; |
8410da8f | 901 | |
69a22773 | 902 | err = drbd_send_sync_param(peer_device); |
0829f5ed | 903 | if (!err) |
69a22773 | 904 | err = drbd_send_sizes(peer_device, 0, 0); |
0829f5ed | 905 | if (!err) |
69a22773 | 906 | err = drbd_send_uuids(peer_device); |
0829f5ed | 907 | if (!err) |
69a22773 | 908 | err = drbd_send_current_state(peer_device); |
b30ab791 AG |
909 | clear_bit(USE_DEGR_WFC_T, &device->flags); |
910 | clear_bit(RESIZE_PENDING, &device->flags); | |
911 | atomic_set(&device->ap_in_flight, 0); | |
912 | mod_timer(&device->request_timer, jiffies + HZ); /* just start it here. */ | |
0829f5ed | 913 | return err; |
907599e0 | 914 | } |
b411b363 PR |
915 | |
916 | /* | |
917 | * return values: | |
918 | * 1 yes, we have a valid connection | |
919 | * 0 oops, did not work out, please try again | |
920 | * -1 peer talks different language, | |
921 | * no point in trying again, please go standalone. | |
922 | * -2 We do not have a network config... | |
923 | */ | |
bde89a9e | 924 | static int conn_connect(struct drbd_connection *connection) |
b411b363 | 925 | { |
7da35862 | 926 | struct drbd_socket sock, msock; |
c06ece6b | 927 | struct drbd_peer_device *peer_device; |
44ed167d | 928 | struct net_conf *nc; |
5d0b17f1 PR |
929 | int vnr, timeout, h; |
930 | bool discard_my_data, ok; | |
197296ff | 931 | enum drbd_state_rv rv; |
7a426fd8 | 932 | struct accept_wait_data ad = { |
bde89a9e | 933 | .connection = connection, |
7a426fd8 PR |
934 | .door_bell = COMPLETION_INITIALIZER_ONSTACK(ad.door_bell), |
935 | }; | |
b411b363 | 936 | |
bde89a9e AG |
937 | clear_bit(DISCONNECT_SENT, &connection->flags); |
938 | if (conn_request_state(connection, NS(conn, C_WF_CONNECTION), CS_VERBOSE) < SS_SUCCESS) | |
b411b363 PR |
939 | return -2; |
940 | ||
7da35862 | 941 | mutex_init(&sock.mutex); |
bde89a9e AG |
942 | sock.sbuf = connection->data.sbuf; |
943 | sock.rbuf = connection->data.rbuf; | |
7da35862 PR |
944 | sock.socket = NULL; |
945 | mutex_init(&msock.mutex); | |
bde89a9e AG |
946 | msock.sbuf = connection->meta.sbuf; |
947 | msock.rbuf = connection->meta.rbuf; | |
7da35862 PR |
948 | msock.socket = NULL; |
949 | ||
0916e0e3 | 950 | /* Assume that the peer only understands protocol 80 until we know better. */ |
bde89a9e | 951 | connection->agreed_pro_version = 80; |
b411b363 | 952 | |
bde89a9e | 953 | if (prepare_listen_socket(connection, &ad)) |
7a426fd8 | 954 | return 0; |
b411b363 PR |
955 | |
956 | do { | |
2bf89621 | 957 | struct socket *s; |
b411b363 | 958 | |
bde89a9e | 959 | s = drbd_try_connect(connection); |
b411b363 | 960 | if (s) { |
7da35862 PR |
961 | if (!sock.socket) { |
962 | sock.socket = s; | |
bde89a9e | 963 | send_first_packet(connection, &sock, P_INITIAL_DATA); |
7da35862 | 964 | } else if (!msock.socket) { |
bde89a9e | 965 | clear_bit(RESOLVE_CONFLICTS, &connection->flags); |
7da35862 | 966 | msock.socket = s; |
bde89a9e | 967 | send_first_packet(connection, &msock, P_INITIAL_META); |
b411b363 | 968 | } else { |
1ec861eb | 969 | drbd_err(connection, "Logic error in conn_connect()\n"); |
b411b363 PR |
970 | goto out_release_sockets; |
971 | } | |
972 | } | |
973 | ||
5d0b17f1 PR |
974 | if (connection_established(connection, &sock.socket, &msock.socket)) |
975 | break; | |
b411b363 PR |
976 | |
977 | retry: | |
bde89a9e | 978 | s = drbd_wait_for_connect(connection, &ad); |
b411b363 | 979 | if (s) { |
bde89a9e | 980 | int fp = receive_first_packet(connection, s); |
7da35862 PR |
981 | drbd_socket_okay(&sock.socket); |
982 | drbd_socket_okay(&msock.socket); | |
92f14951 | 983 | switch (fp) { |
e5d6f33a | 984 | case P_INITIAL_DATA: |
7da35862 | 985 | if (sock.socket) { |
1ec861eb | 986 | drbd_warn(connection, "initial packet S crossed\n"); |
7da35862 | 987 | sock_release(sock.socket); |
80c6eed4 PR |
988 | sock.socket = s; |
989 | goto randomize; | |
b411b363 | 990 | } |
7da35862 | 991 | sock.socket = s; |
b411b363 | 992 | break; |
e5d6f33a | 993 | case P_INITIAL_META: |
bde89a9e | 994 | set_bit(RESOLVE_CONFLICTS, &connection->flags); |
7da35862 | 995 | if (msock.socket) { |
1ec861eb | 996 | drbd_warn(connection, "initial packet M crossed\n"); |
7da35862 | 997 | sock_release(msock.socket); |
80c6eed4 PR |
998 | msock.socket = s; |
999 | goto randomize; | |
b411b363 | 1000 | } |
7da35862 | 1001 | msock.socket = s; |
b411b363 PR |
1002 | break; |
1003 | default: | |
1ec861eb | 1004 | drbd_warn(connection, "Error receiving initial packet\n"); |
b411b363 | 1005 | sock_release(s); |
80c6eed4 | 1006 | randomize: |
8032bf12 | 1007 | if (get_random_u32_below(2)) |
b411b363 PR |
1008 | goto retry; |
1009 | } | |
1010 | } | |
1011 | ||
bde89a9e | 1012 | if (connection->cstate <= C_DISCONNECTING) |
b411b363 PR |
1013 | goto out_release_sockets; |
1014 | if (signal_pending(current)) { | |
1015 | flush_signals(current); | |
1016 | smp_rmb(); | |
bde89a9e | 1017 | if (get_t_state(&connection->receiver) == EXITING) |
b411b363 PR |
1018 | goto out_release_sockets; |
1019 | } | |
1020 | ||
5d0b17f1 | 1021 | ok = connection_established(connection, &sock.socket, &msock.socket); |
b666dbf8 | 1022 | } while (!ok); |
b411b363 | 1023 | |
7a426fd8 PR |
1024 | if (ad.s_listen) |
1025 | sock_release(ad.s_listen); | |
b411b363 | 1026 | |
98683650 PR |
1027 | sock.socket->sk->sk_reuse = SK_CAN_REUSE; /* SO_REUSEADDR */ |
1028 | msock.socket->sk->sk_reuse = SK_CAN_REUSE; /* SO_REUSEADDR */ | |
b411b363 | 1029 | |
7da35862 PR |
1030 | sock.socket->sk->sk_allocation = GFP_NOIO; |
1031 | msock.socket->sk->sk_allocation = GFP_NOIO; | |
b411b363 | 1032 | |
98123866 BC |
1033 | sock.socket->sk->sk_use_task_frag = false; |
1034 | msock.socket->sk->sk_use_task_frag = false; | |
1035 | ||
7da35862 PR |
1036 | sock.socket->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; |
1037 | msock.socket->sk->sk_priority = TC_PRIO_INTERACTIVE; | |
b411b363 | 1038 | |
b411b363 | 1039 | /* NOT YET ... |
bde89a9e | 1040 | * sock.socket->sk->sk_sndtimeo = connection->net_conf->timeout*HZ/10; |
7da35862 | 1041 | * sock.socket->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; |
6038178e | 1042 | * first set it to the P_CONNECTION_FEATURES timeout, |
b411b363 | 1043 | * which we set to 4x the configured ping_timeout. */ |
44ed167d | 1044 | rcu_read_lock(); |
bde89a9e | 1045 | nc = rcu_dereference(connection->net_conf); |
44ed167d | 1046 | |
7da35862 PR |
1047 | sock.socket->sk->sk_sndtimeo = |
1048 | sock.socket->sk->sk_rcvtimeo = nc->ping_timeo*4*HZ/10; | |
b411b363 | 1049 | |
7da35862 | 1050 | msock.socket->sk->sk_rcvtimeo = nc->ping_int*HZ; |
44ed167d | 1051 | timeout = nc->timeout * HZ / 10; |
08b165ba | 1052 | discard_my_data = nc->discard_my_data; |
44ed167d | 1053 | rcu_read_unlock(); |
b411b363 | 1054 | |
7da35862 | 1055 | msock.socket->sk->sk_sndtimeo = timeout; |
b411b363 PR |
1056 | |
1057 | /* we don't want delays. | |
25985edc | 1058 | * we use TCP_CORK where appropriate, though */ |
12abc5ee CH |
1059 | tcp_sock_set_nodelay(sock.socket->sk); |
1060 | tcp_sock_set_nodelay(msock.socket->sk); | |
b411b363 | 1061 | |
bde89a9e AG |
1062 | connection->data.socket = sock.socket; |
1063 | connection->meta.socket = msock.socket; | |
1064 | connection->last_received = jiffies; | |
b411b363 | 1065 | |
bde89a9e | 1066 | h = drbd_do_features(connection); |
b411b363 PR |
1067 | if (h <= 0) |
1068 | return h; | |
1069 | ||
bde89a9e | 1070 | if (connection->cram_hmac_tfm) { |
b30ab791 | 1071 | /* drbd_request_state(device, NS(conn, WFAuth)); */ |
bde89a9e | 1072 | switch (drbd_do_auth(connection)) { |
b10d96cb | 1073 | case -1: |
1ec861eb | 1074 | drbd_err(connection, "Authentication of peer failed\n"); |
b411b363 | 1075 | return -1; |
b10d96cb | 1076 | case 0: |
1ec861eb | 1077 | drbd_err(connection, "Authentication of peer failed, trying again.\n"); |
b10d96cb | 1078 | return 0; |
b411b363 PR |
1079 | } |
1080 | } | |
1081 | ||
bde89a9e AG |
1082 | connection->data.socket->sk->sk_sndtimeo = timeout; |
1083 | connection->data.socket->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
b411b363 | 1084 | |
bde89a9e | 1085 | if (drbd_send_protocol(connection) == -EOPNOTSUPP) |
7e2455c1 | 1086 | return -1; |
b411b363 | 1087 | |
31007745 PR |
1088 | /* Prevent a race between resync-handshake and |
1089 | * being promoted to Primary. | |
1090 | * | |
1091 | * Grab and release the state mutex, so we know that any current | |
1092 | * drbd_set_role() is finished, and any incoming drbd_set_role | |
1093 | * will see the STATE_SENT flag, and wait for it to be cleared. | |
1094 | */ | |
1095 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) | |
1096 | mutex_lock(peer_device->device->state_mutex); | |
1097 | ||
cde81d99 LE |
1098 | /* avoid a race with conn_request_state( C_DISCONNECTING ) */ |
1099 | spin_lock_irq(&connection->resource->req_lock); | |
bde89a9e | 1100 | set_bit(STATE_SENT, &connection->flags); |
cde81d99 | 1101 | spin_unlock_irq(&connection->resource->req_lock); |
a1096a6e | 1102 | |
31007745 PR |
1103 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) |
1104 | mutex_unlock(peer_device->device->state_mutex); | |
1105 | ||
c141ebda | 1106 | rcu_read_lock(); |
c06ece6b AG |
1107 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
1108 | struct drbd_device *device = peer_device->device; | |
b30ab791 | 1109 | kref_get(&device->kref); |
26ea8f92 AG |
1110 | rcu_read_unlock(); |
1111 | ||
08b165ba | 1112 | if (discard_my_data) |
b30ab791 | 1113 | set_bit(DISCARD_MY_DATA, &device->flags); |
08b165ba | 1114 | else |
b30ab791 | 1115 | clear_bit(DISCARD_MY_DATA, &device->flags); |
08b165ba | 1116 | |
69a22773 | 1117 | drbd_connected(peer_device); |
05a10ec7 | 1118 | kref_put(&device->kref, drbd_destroy_device); |
c141ebda PR |
1119 | rcu_read_lock(); |
1120 | } | |
1121 | rcu_read_unlock(); | |
1122 | ||
bde89a9e AG |
1123 | rv = conn_request_state(connection, NS(conn, C_WF_REPORT_PARAMS), CS_VERBOSE); |
1124 | if (rv < SS_SUCCESS || connection->cstate != C_WF_REPORT_PARAMS) { | |
1125 | clear_bit(STATE_SENT, &connection->flags); | |
1e86ac48 | 1126 | return 0; |
a1096a6e | 1127 | } |
1e86ac48 | 1128 | |
1c03e520 | 1129 | drbd_thread_start(&connection->ack_receiver); |
39e91a60 LE |
1130 | /* opencoded create_singlethread_workqueue(), |
1131 | * to be able to use format string arguments */ | |
1132 | connection->ack_sender = | |
1133 | alloc_ordered_workqueue("drbd_as_%s", WQ_MEM_RECLAIM, connection->resource->name); | |
668700b4 PR |
1134 | if (!connection->ack_sender) { |
1135 | drbd_err(connection, "Failed to create workqueue ack_sender\n"); | |
1136 | return 0; | |
1137 | } | |
b411b363 | 1138 | |
0500813f | 1139 | mutex_lock(&connection->resource->conf_update); |
08b165ba PR |
1140 | /* The discard_my_data flag is a single-shot modifier to the next |
1141 | * connection attempt, the handshake of which is now well underway. | |
1142 | * No need for rcu style copying of the whole struct | |
1143 | * just to clear a single value. */ | |
bde89a9e | 1144 | connection->net_conf->discard_my_data = 0; |
0500813f | 1145 | mutex_unlock(&connection->resource->conf_update); |
08b165ba | 1146 | |
d3fcb490 | 1147 | return h; |
b411b363 PR |
1148 | |
1149 | out_release_sockets: | |
7a426fd8 PR |
1150 | if (ad.s_listen) |
1151 | sock_release(ad.s_listen); | |
7da35862 PR |
1152 | if (sock.socket) |
1153 | sock_release(sock.socket); | |
1154 | if (msock.socket) | |
1155 | sock_release(msock.socket); | |
b411b363 PR |
1156 | return -1; |
1157 | } | |
1158 | ||
bde89a9e | 1159 | static int decode_header(struct drbd_connection *connection, void *header, struct packet_info *pi) |
b411b363 | 1160 | { |
bde89a9e | 1161 | unsigned int header_size = drbd_header_size(connection); |
e658983a | 1162 | |
0c8e36d9 AG |
1163 | if (header_size == sizeof(struct p_header100) && |
1164 | *(__be32 *)header == cpu_to_be32(DRBD_MAGIC_100)) { | |
1165 | struct p_header100 *h = header; | |
1166 | if (h->pad != 0) { | |
1ec861eb | 1167 | drbd_err(connection, "Header padding is not zero\n"); |
0c8e36d9 AG |
1168 | return -EINVAL; |
1169 | } | |
1170 | pi->vnr = be16_to_cpu(h->volume); | |
1171 | pi->cmd = be16_to_cpu(h->command); | |
1172 | pi->size = be32_to_cpu(h->length); | |
1173 | } else if (header_size == sizeof(struct p_header95) && | |
1174 | *(__be16 *)header == cpu_to_be16(DRBD_MAGIC_BIG)) { | |
e658983a | 1175 | struct p_header95 *h = header; |
e658983a | 1176 | pi->cmd = be16_to_cpu(h->command); |
b55d84ba AG |
1177 | pi->size = be32_to_cpu(h->length); |
1178 | pi->vnr = 0; | |
e658983a AG |
1179 | } else if (header_size == sizeof(struct p_header80) && |
1180 | *(__be32 *)header == cpu_to_be32(DRBD_MAGIC)) { | |
1181 | struct p_header80 *h = header; | |
1182 | pi->cmd = be16_to_cpu(h->command); | |
1183 | pi->size = be16_to_cpu(h->length); | |
77351055 | 1184 | pi->vnr = 0; |
02918be2 | 1185 | } else { |
1ec861eb | 1186 | drbd_err(connection, "Wrong magic value 0x%08x in protocol version %d\n", |
e658983a | 1187 | be32_to_cpu(*(__be32 *)header), |
bde89a9e | 1188 | connection->agreed_pro_version); |
8172f3e9 | 1189 | return -EINVAL; |
b411b363 | 1190 | } |
e658983a | 1191 | pi->data = header + header_size; |
8172f3e9 | 1192 | return 0; |
257d0af6 | 1193 | } |
b411b363 | 1194 | |
c51a0ef3 LE |
1195 | static void drbd_unplug_all_devices(struct drbd_connection *connection) |
1196 | { | |
1197 | if (current->plug == &connection->receiver_plug) { | |
1198 | blk_finish_plug(&connection->receiver_plug); | |
1199 | blk_start_plug(&connection->receiver_plug); | |
1200 | } /* else: maybe just schedule() ?? */ | |
1201 | } | |
1202 | ||
bde89a9e | 1203 | static int drbd_recv_header(struct drbd_connection *connection, struct packet_info *pi) |
257d0af6 | 1204 | { |
bde89a9e | 1205 | void *buffer = connection->data.rbuf; |
69bc7bc3 | 1206 | int err; |
257d0af6 | 1207 | |
bde89a9e | 1208 | err = drbd_recv_all_warn(connection, buffer, drbd_header_size(connection)); |
a5c31904 | 1209 | if (err) |
69bc7bc3 | 1210 | return err; |
257d0af6 | 1211 | |
bde89a9e AG |
1212 | err = decode_header(connection, buffer, pi); |
1213 | connection->last_received = jiffies; | |
b411b363 | 1214 | |
69bc7bc3 | 1215 | return err; |
b411b363 PR |
1216 | } |
1217 | ||
c51a0ef3 LE |
1218 | static int drbd_recv_header_maybe_unplug(struct drbd_connection *connection, struct packet_info *pi) |
1219 | { | |
1220 | void *buffer = connection->data.rbuf; | |
1221 | unsigned int size = drbd_header_size(connection); | |
1222 | int err; | |
1223 | ||
1224 | err = drbd_recv_short(connection->data.socket, buffer, size, MSG_NOSIGNAL|MSG_DONTWAIT); | |
1225 | if (err != size) { | |
1226 | /* If we have nothing in the receive buffer now, to reduce | |
1227 | * application latency, try to drain the backend queues as | |
1228 | * quickly as possible, and let remote TCP know what we have | |
1229 | * received so far. */ | |
1230 | if (err == -EAGAIN) { | |
ddd061b8 | 1231 | tcp_sock_set_quickack(connection->data.socket->sk, 2); |
c51a0ef3 LE |
1232 | drbd_unplug_all_devices(connection); |
1233 | } | |
1234 | if (err > 0) { | |
1235 | buffer += err; | |
1236 | size -= err; | |
1237 | } | |
1238 | err = drbd_recv_all_warn(connection, buffer, size); | |
1239 | if (err) | |
1240 | return err; | |
1241 | } | |
1242 | ||
1243 | err = decode_header(connection, connection->data.rbuf, pi); | |
1244 | connection->last_received = jiffies; | |
1245 | ||
1246 | return err; | |
1247 | } | |
f9ff0da5 LE |
1248 | /* This is blkdev_issue_flush, but asynchronous. |
1249 | * We want to submit to all component volumes in parallel, | |
1250 | * then wait for all completions. | |
1251 | */ | |
1252 | struct issue_flush_context { | |
1253 | atomic_t pending; | |
1254 | int error; | |
1255 | struct completion done; | |
1256 | }; | |
1257 | struct one_flush_context { | |
1258 | struct drbd_device *device; | |
1259 | struct issue_flush_context *ctx; | |
1260 | }; | |
1261 | ||
1ffa7bfa | 1262 | static void one_flush_endio(struct bio *bio) |
b411b363 | 1263 | { |
f9ff0da5 LE |
1264 | struct one_flush_context *octx = bio->bi_private; |
1265 | struct drbd_device *device = octx->device; | |
1266 | struct issue_flush_context *ctx = octx->ctx; | |
1267 | ||
4e4cbee9 CH |
1268 | if (bio->bi_status) { |
1269 | ctx->error = blk_status_to_errno(bio->bi_status); | |
1270 | drbd_info(device, "local disk FLUSH FAILED with status %d\n", bio->bi_status); | |
f9ff0da5 LE |
1271 | } |
1272 | kfree(octx); | |
1273 | bio_put(bio); | |
1274 | ||
1275 | clear_bit(FLUSH_PENDING, &device->flags); | |
1276 | put_ldev(device); | |
1277 | kref_put(&device->kref, drbd_destroy_device); | |
1278 | ||
1279 | if (atomic_dec_and_test(&ctx->pending)) | |
1280 | complete(&ctx->done); | |
1281 | } | |
1282 | ||
1283 | static void submit_one_flush(struct drbd_device *device, struct issue_flush_context *ctx) | |
1284 | { | |
07888c66 CH |
1285 | struct bio *bio = bio_alloc(device->ldev->backing_bdev, 0, |
1286 | REQ_OP_FLUSH | REQ_PREFLUSH, GFP_NOIO); | |
f9ff0da5 | 1287 | struct one_flush_context *octx = kmalloc(sizeof(*octx), GFP_NOIO); |
4b1dc86d CH |
1288 | |
1289 | if (!octx) { | |
1290 | drbd_warn(device, "Could not allocate a octx, CANNOT ISSUE FLUSH\n"); | |
f9ff0da5 LE |
1291 | /* FIXME: what else can I do now? disconnecting or detaching |
1292 | * really does not help to improve the state of the world, either. | |
1293 | */ | |
4b1dc86d | 1294 | bio_put(bio); |
f9ff0da5 LE |
1295 | |
1296 | ctx->error = -ENOMEM; | |
1297 | put_ldev(device); | |
1298 | kref_put(&device->kref, drbd_destroy_device); | |
1299 | return; | |
1300 | } | |
4b0007c0 | 1301 | |
f9ff0da5 LE |
1302 | octx->device = device; |
1303 | octx->ctx = ctx; | |
f9ff0da5 LE |
1304 | bio->bi_private = octx; |
1305 | bio->bi_end_io = one_flush_endio; | |
f9ff0da5 LE |
1306 | |
1307 | device->flush_jif = jiffies; | |
1308 | set_bit(FLUSH_PENDING, &device->flags); | |
1309 | atomic_inc(&ctx->pending); | |
1310 | submit_bio(bio); | |
1311 | } | |
1312 | ||
1313 | static void drbd_flush(struct drbd_connection *connection) | |
1314 | { | |
f6ba8636 | 1315 | if (connection->resource->write_ordering >= WO_BDEV_FLUSH) { |
f9ff0da5 LE |
1316 | struct drbd_peer_device *peer_device; |
1317 | struct issue_flush_context ctx; | |
1318 | int vnr; | |
1319 | ||
1320 | atomic_set(&ctx.pending, 1); | |
1321 | ctx.error = 0; | |
1322 | init_completion(&ctx.done); | |
1323 | ||
615e087f | 1324 | rcu_read_lock(); |
c06ece6b AG |
1325 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
1326 | struct drbd_device *device = peer_device->device; | |
1327 | ||
b30ab791 | 1328 | if (!get_ldev(device)) |
615e087f | 1329 | continue; |
b30ab791 | 1330 | kref_get(&device->kref); |
615e087f LE |
1331 | rcu_read_unlock(); |
1332 | ||
f9ff0da5 | 1333 | submit_one_flush(device, &ctx); |
b411b363 | 1334 | |
615e087f | 1335 | rcu_read_lock(); |
b411b363 | 1336 | } |
615e087f | 1337 | rcu_read_unlock(); |
f9ff0da5 LE |
1338 | |
1339 | /* Do we want to add a timeout, | |
1340 | * if disk-timeout is set? */ | |
1341 | if (!atomic_dec_and_test(&ctx.pending)) | |
1342 | wait_for_completion(&ctx.done); | |
1343 | ||
1344 | if (ctx.error) { | |
1345 | /* would rather check on EOPNOTSUPP, but that is not reliable. | |
1346 | * don't try again for ANY return value != 0 | |
1347 | * if (rv == -EOPNOTSUPP) */ | |
1348 | /* Any error is already reported by bio_endio callback. */ | |
1349 | drbd_bump_write_ordering(connection->resource, NULL, WO_DRAIN_IO); | |
1350 | } | |
b411b363 | 1351 | } |
b411b363 PR |
1352 | } |
1353 | ||
1354 | /** | |
1355 | * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. | |
9b48ff07 | 1356 | * @connection: DRBD connection. |
b411b363 PR |
1357 | * @epoch: Epoch object. |
1358 | * @ev: Epoch event. | |
1359 | */ | |
bde89a9e | 1360 | static enum finish_epoch drbd_may_finish_epoch(struct drbd_connection *connection, |
b411b363 PR |
1361 | struct drbd_epoch *epoch, |
1362 | enum epoch_event ev) | |
1363 | { | |
2451fc3b | 1364 | int epoch_size; |
b411b363 | 1365 | struct drbd_epoch *next_epoch; |
b411b363 PR |
1366 | enum finish_epoch rv = FE_STILL_LIVE; |
1367 | ||
bde89a9e | 1368 | spin_lock(&connection->epoch_lock); |
b411b363 PR |
1369 | do { |
1370 | next_epoch = NULL; | |
b411b363 PR |
1371 | |
1372 | epoch_size = atomic_read(&epoch->epoch_size); | |
1373 | ||
1374 | switch (ev & ~EV_CLEANUP) { | |
1375 | case EV_PUT: | |
1376 | atomic_dec(&epoch->active); | |
1377 | break; | |
1378 | case EV_GOT_BARRIER_NR: | |
1379 | set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); | |
b411b363 PR |
1380 | break; |
1381 | case EV_BECAME_LAST: | |
1382 | /* nothing to do*/ | |
1383 | break; | |
1384 | } | |
1385 | ||
b411b363 PR |
1386 | if (epoch_size != 0 && |
1387 | atomic_read(&epoch->active) == 0 && | |
80f9fd55 | 1388 | (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags) || ev & EV_CLEANUP)) { |
b411b363 | 1389 | if (!(ev & EV_CLEANUP)) { |
bde89a9e AG |
1390 | spin_unlock(&connection->epoch_lock); |
1391 | drbd_send_b_ack(epoch->connection, epoch->barrier_nr, epoch_size); | |
1392 | spin_lock(&connection->epoch_lock); | |
b411b363 | 1393 | } |
9ed57dcb LE |
1394 | #if 0 |
1395 | /* FIXME: dec unacked on connection, once we have | |
1396 | * something to count pending connection packets in. */ | |
80f9fd55 | 1397 | if (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) |
bde89a9e | 1398 | dec_unacked(epoch->connection); |
9ed57dcb | 1399 | #endif |
b411b363 | 1400 | |
bde89a9e | 1401 | if (connection->current_epoch != epoch) { |
b411b363 PR |
1402 | next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); |
1403 | list_del(&epoch->list); | |
1404 | ev = EV_BECAME_LAST | (ev & EV_CLEANUP); | |
bde89a9e | 1405 | connection->epochs--; |
b411b363 PR |
1406 | kfree(epoch); |
1407 | ||
1408 | if (rv == FE_STILL_LIVE) | |
1409 | rv = FE_DESTROYED; | |
1410 | } else { | |
1411 | epoch->flags = 0; | |
1412 | atomic_set(&epoch->epoch_size, 0); | |
698f9315 | 1413 | /* atomic_set(&epoch->active, 0); is already zero */ |
b411b363 PR |
1414 | if (rv == FE_STILL_LIVE) |
1415 | rv = FE_RECYCLED; | |
1416 | } | |
1417 | } | |
1418 | ||
1419 | if (!next_epoch) | |
1420 | break; | |
1421 | ||
1422 | epoch = next_epoch; | |
1423 | } while (1); | |
1424 | ||
bde89a9e | 1425 | spin_unlock(&connection->epoch_lock); |
b411b363 | 1426 | |
b411b363 PR |
1427 | return rv; |
1428 | } | |
1429 | ||
8fe39aac PR |
1430 | static enum write_ordering_e |
1431 | max_allowed_wo(struct drbd_backing_dev *bdev, enum write_ordering_e wo) | |
1432 | { | |
1433 | struct disk_conf *dc; | |
1434 | ||
1435 | dc = rcu_dereference(bdev->disk_conf); | |
1436 | ||
f6ba8636 AG |
1437 | if (wo == WO_BDEV_FLUSH && !dc->disk_flushes) |
1438 | wo = WO_DRAIN_IO; | |
1439 | if (wo == WO_DRAIN_IO && !dc->disk_drain) | |
1440 | wo = WO_NONE; | |
8fe39aac PR |
1441 | |
1442 | return wo; | |
1443 | } | |
1444 | ||
9b48ff07 | 1445 | /* |
b411b363 | 1446 | * drbd_bump_write_ordering() - Fall back to an other write ordering method |
b411b363 PR |
1447 | * @wo: Write ordering method to try. |
1448 | */ | |
8fe39aac PR |
1449 | void drbd_bump_write_ordering(struct drbd_resource *resource, struct drbd_backing_dev *bdev, |
1450 | enum write_ordering_e wo) | |
b411b363 | 1451 | { |
e9526580 | 1452 | struct drbd_device *device; |
b411b363 | 1453 | enum write_ordering_e pwo; |
4b0007c0 | 1454 | int vnr; |
b411b363 | 1455 | static char *write_ordering_str[] = { |
f6ba8636 AG |
1456 | [WO_NONE] = "none", |
1457 | [WO_DRAIN_IO] = "drain", | |
1458 | [WO_BDEV_FLUSH] = "flush", | |
b411b363 PR |
1459 | }; |
1460 | ||
e9526580 | 1461 | pwo = resource->write_ordering; |
f6ba8636 | 1462 | if (wo != WO_BDEV_FLUSH) |
70df7092 | 1463 | wo = min(pwo, wo); |
daeda1cc | 1464 | rcu_read_lock(); |
e9526580 | 1465 | idr_for_each_entry(&resource->devices, device, vnr) { |
8fe39aac PR |
1466 | if (get_ldev(device)) { |
1467 | wo = max_allowed_wo(device->ldev, wo); | |
1468 | if (device->ldev == bdev) | |
1469 | bdev = NULL; | |
1470 | put_ldev(device); | |
1471 | } | |
4b0007c0 | 1472 | } |
8fe39aac PR |
1473 | |
1474 | if (bdev) | |
1475 | wo = max_allowed_wo(bdev, wo); | |
1476 | ||
70df7092 LE |
1477 | rcu_read_unlock(); |
1478 | ||
e9526580 | 1479 | resource->write_ordering = wo; |
f6ba8636 | 1480 | if (pwo != resource->write_ordering || wo == WO_BDEV_FLUSH) |
e9526580 | 1481 | drbd_info(resource, "Method to ensure write ordering: %s\n", write_ordering_str[resource->write_ordering]); |
b411b363 PR |
1482 | } |
1483 | ||
f31e583a LE |
1484 | /* |
1485 | * Mapping "discard" to ZEROOUT with UNMAP does not work for us: | |
1486 | * Drivers have to "announce" q->limits.max_write_zeroes_sectors, or it | |
1487 | * will directly go to fallback mode, submitting normal writes, and | |
1488 | * never even try to UNMAP. | |
1489 | * | |
1490 | * And dm-thin does not do this (yet), mostly because in general it has | |
1491 | * to assume that "skip_block_zeroing" is set. See also: | |
1492 | * https://www.mail-archive.com/dm-devel%40redhat.com/msg07965.html | |
1493 | * https://www.redhat.com/archives/dm-devel/2018-January/msg00271.html | |
1494 | * | |
1495 | * We *may* ignore the discard-zeroes-data setting, if so configured. | |
1496 | * | |
1497 | * Assumption is that this "discard_zeroes_data=0" is only because the backend | |
1498 | * may ignore partial unaligned discards. | |
1499 | * | |
1500 | * LVM/DM thin as of at least | |
1501 | * LVM version: 2.02.115(2)-RHEL7 (2015-01-28) | |
1502 | * Library version: 1.02.93-RHEL7 (2015-01-28) | |
1503 | * Driver version: 4.29.0 | |
1504 | * still behaves this way. | |
1505 | * | |
1506 | * For unaligned (wrt. alignment and granularity) or too small discards, | |
1507 | * we zero-out the initial (and/or) trailing unaligned partial chunks, | |
1508 | * but discard all the aligned full chunks. | |
1509 | * | |
1510 | * At least for LVM/DM thin, with skip_block_zeroing=false, | |
1511 | * the result is effectively "discard_zeroes_data=1". | |
1512 | */ | |
1513 | /* flags: EE_TRIM|EE_ZEROOUT */ | |
1514 | int drbd_issue_discard_or_zero_out(struct drbd_device *device, sector_t start, unsigned int nr_sectors, int flags) | |
dd4f699d LE |
1515 | { |
1516 | struct block_device *bdev = device->ldev->backing_bdev; | |
f31e583a LE |
1517 | sector_t tmp, nr; |
1518 | unsigned int max_discard_sectors, granularity; | |
1519 | int alignment; | |
1520 | int err = 0; | |
dd4f699d | 1521 | |
f31e583a LE |
1522 | if ((flags & EE_ZEROOUT) || !(flags & EE_TRIM)) |
1523 | goto zero_out; | |
1524 | ||
1525 | /* Zero-sector (unknown) and one-sector granularities are the same. */ | |
7b47ef52 | 1526 | granularity = max(bdev_discard_granularity(bdev) >> 9, 1U); |
f31e583a LE |
1527 | alignment = (bdev_discard_alignment(bdev) >> 9) % granularity; |
1528 | ||
cf0fbf89 | 1529 | max_discard_sectors = min(bdev_max_discard_sectors(bdev), (1U << 22)); |
f31e583a LE |
1530 | max_discard_sectors -= max_discard_sectors % granularity; |
1531 | if (unlikely(!max_discard_sectors)) | |
1532 | goto zero_out; | |
1533 | ||
1534 | if (nr_sectors < granularity) | |
1535 | goto zero_out; | |
1536 | ||
1537 | tmp = start; | |
1538 | if (sector_div(tmp, granularity) != alignment) { | |
1539 | if (nr_sectors < 2*granularity) | |
1540 | goto zero_out; | |
1541 | /* start + gran - (start + gran - align) % gran */ | |
1542 | tmp = start + granularity - alignment; | |
1543 | tmp = start + granularity - sector_div(tmp, granularity); | |
1544 | ||
1545 | nr = tmp - start; | |
1546 | /* don't flag BLKDEV_ZERO_NOUNMAP, we don't know how many | |
1547 | * layers are below us, some may have smaller granularity */ | |
1548 | err |= blkdev_issue_zeroout(bdev, start, nr, GFP_NOIO, 0); | |
1549 | nr_sectors -= nr; | |
1550 | start = tmp; | |
1551 | } | |
1552 | while (nr_sectors >= max_discard_sectors) { | |
44abff2c CH |
1553 | err |= blkdev_issue_discard(bdev, start, max_discard_sectors, |
1554 | GFP_NOIO); | |
f31e583a LE |
1555 | nr_sectors -= max_discard_sectors; |
1556 | start += max_discard_sectors; | |
1557 | } | |
1558 | if (nr_sectors) { | |
1559 | /* max_discard_sectors is unsigned int (and a multiple of | |
1560 | * granularity, we made sure of that above already); | |
1561 | * nr is < max_discard_sectors; | |
1562 | * I don't need sector_div here, even though nr is sector_t */ | |
1563 | nr = nr_sectors; | |
1564 | nr -= (unsigned int)nr % granularity; | |
1565 | if (nr) { | |
44abff2c | 1566 | err |= blkdev_issue_discard(bdev, start, nr, GFP_NOIO); |
f31e583a LE |
1567 | nr_sectors -= nr; |
1568 | start += nr; | |
1569 | } | |
1570 | } | |
1571 | zero_out: | |
1572 | if (nr_sectors) { | |
1573 | err |= blkdev_issue_zeroout(bdev, start, nr_sectors, GFP_NOIO, | |
1574 | (flags & EE_TRIM) ? 0 : BLKDEV_ZERO_NOUNMAP); | |
1575 | } | |
1576 | return err != 0; | |
1577 | } | |
0dbed96a | 1578 | |
f31e583a LE |
1579 | static bool can_do_reliable_discards(struct drbd_device *device) |
1580 | { | |
f31e583a LE |
1581 | struct disk_conf *dc; |
1582 | bool can_do; | |
0dbed96a | 1583 | |
70200574 | 1584 | if (!bdev_max_discard_sectors(device->ldev->backing_bdev)) |
f31e583a LE |
1585 | return false; |
1586 | ||
1587 | rcu_read_lock(); | |
1588 | dc = rcu_dereference(device->ldev->disk_conf); | |
1589 | can_do = dc->discard_zeroes_if_aligned; | |
1590 | rcu_read_unlock(); | |
1591 | return can_do; | |
1592 | } | |
1593 | ||
1594 | static void drbd_issue_peer_discard_or_zero_out(struct drbd_device *device, struct drbd_peer_request *peer_req) | |
1595 | { | |
1596 | /* If the backend cannot discard, or does not guarantee | |
1597 | * read-back zeroes in discarded ranges, we fall back to | |
1598 | * zero-out. Unless configuration specifically requested | |
1599 | * otherwise. */ | |
1600 | if (!can_do_reliable_discards(device)) | |
1601 | peer_req->flags |= EE_ZEROOUT; | |
1602 | ||
1603 | if (drbd_issue_discard_or_zero_out(device, peer_req->i.sector, | |
1604 | peer_req->i.size >> 9, peer_req->flags & (EE_ZEROOUT|EE_TRIM))) | |
1605 | peer_req->flags |= EE_WAS_ERROR; | |
dd4f699d LE |
1606 | drbd_endio_write_sec_final(peer_req); |
1607 | } | |
1608 | ||
ce668b6d CB |
1609 | static int peer_request_fault_type(struct drbd_peer_request *peer_req) |
1610 | { | |
1611 | if (peer_req_op(peer_req) == REQ_OP_READ) { | |
1612 | return peer_req->flags & EE_APPLICATION ? | |
1613 | DRBD_FAULT_DT_RD : DRBD_FAULT_RS_RD; | |
1614 | } else { | |
1615 | return peer_req->flags & EE_APPLICATION ? | |
1616 | DRBD_FAULT_DT_WR : DRBD_FAULT_RS_WR; | |
1617 | } | |
1618 | } | |
1619 | ||
a34592ff | 1620 | /** |
fbe29dec | 1621 | * drbd_submit_peer_request() |
db830c46 | 1622 | * @peer_req: peer request |
10f6d992 LE |
1623 | * |
1624 | * May spread the pages to multiple bios, | |
1625 | * depending on bio_add_page restrictions. | |
1626 | * | |
1627 | * Returns 0 if all bios have been submitted, | |
1628 | * -ENOMEM if we could not allocate enough bios, | |
1629 | * -ENOSPC (any better suggestion?) if we have not been able to bio_add_page a | |
1630 | * single page to an empty bio (which should never happen and likely indicates | |
1631 | * that the lower level IO stack is in some way broken). This has been observed | |
1632 | * on certain Xen deployments. | |
45bb912b LE |
1633 | */ |
1634 | /* TODO allocate from our own bio_set. */ | |
ce668b6d | 1635 | int drbd_submit_peer_request(struct drbd_peer_request *peer_req) |
45bb912b | 1636 | { |
ce668b6d | 1637 | struct drbd_device *device = peer_req->peer_device->device; |
45bb912b LE |
1638 | struct bio *bios = NULL; |
1639 | struct bio *bio; | |
db830c46 AG |
1640 | struct page *page = peer_req->pages; |
1641 | sector_t sector = peer_req->i.sector; | |
e6be38a1 CH |
1642 | unsigned int data_size = peer_req->i.size; |
1643 | unsigned int n_bios = 0; | |
1644 | unsigned int nr_pages = PFN_UP(data_size); | |
45bb912b | 1645 | |
dd4f699d LE |
1646 | /* TRIM/DISCARD: for now, always use the helper function |
1647 | * blkdev_issue_zeroout(..., discard=true). | |
1648 | * It's synchronous, but it does the right thing wrt. bio splitting. | |
1649 | * Correctness first, performance later. Next step is to code an | |
1650 | * asynchronous variant of the same. | |
1651 | */ | |
a34592ff | 1652 | if (peer_req->flags & (EE_TRIM | EE_ZEROOUT)) { |
a0fb3c47 LE |
1653 | /* wait for all pending IO completions, before we start |
1654 | * zeroing things out. */ | |
5dd2ca19 | 1655 | conn_wait_active_ee_empty(peer_req->peer_device->connection); |
45d2933c LE |
1656 | /* add it to the active list now, |
1657 | * so we can find it to present it in debugfs */ | |
21ae5d7f LE |
1658 | peer_req->submit_jif = jiffies; |
1659 | peer_req->flags |= EE_SUBMITTED; | |
700ca8c0 PR |
1660 | |
1661 | /* If this was a resync request from receive_rs_deallocated(), | |
1662 | * it is already on the sync_ee list */ | |
1663 | if (list_empty(&peer_req->w.list)) { | |
1664 | spin_lock_irq(&device->resource->req_lock); | |
1665 | list_add_tail(&peer_req->w.list, &device->active_ee); | |
1666 | spin_unlock_irq(&device->resource->req_lock); | |
1667 | } | |
1668 | ||
a34592ff | 1669 | drbd_issue_peer_discard_or_zero_out(device, peer_req); |
a0fb3c47 LE |
1670 | return 0; |
1671 | } | |
1672 | ||
45bb912b LE |
1673 | /* In most cases, we will only need one bio. But in case the lower |
1674 | * level restrictions happen to be different at this offset on this | |
1675 | * side than those of the sending peer, we may need to submit the | |
9476f39d LE |
1676 | * request in more than one bio. |
1677 | * | |
1678 | * Plain bio_alloc is good enough here, this is no DRBD internally | |
1679 | * generated bio, but a bio allocated on behalf of the peer. | |
1680 | */ | |
45bb912b | 1681 | next_bio: |
ce668b6d CB |
1682 | /* _DISCARD, _WRITE_ZEROES handled above. |
1683 | * REQ_OP_FLUSH (empty flush) not expected, | |
1684 | * should have been mapped to a "drbd protocol barrier". | |
1685 | * REQ_OP_SECURE_ERASE: I don't see how we could ever support that. | |
1686 | */ | |
1687 | if (!(peer_req_op(peer_req) == REQ_OP_WRITE || | |
1688 | peer_req_op(peer_req) == REQ_OP_READ)) { | |
1689 | drbd_err(device, "Invalid bio op received: 0x%x\n", peer_req->opf); | |
1690 | return -EINVAL; | |
1691 | } | |
1692 | ||
1693 | bio = bio_alloc(device->ldev->backing_bdev, nr_pages, peer_req->opf, GFP_NOIO); | |
db830c46 | 1694 | /* > peer_req->i.sector, unless this is the first bio */ |
4f024f37 | 1695 | bio->bi_iter.bi_sector = sector; |
db830c46 | 1696 | bio->bi_private = peer_req; |
fcefa62e | 1697 | bio->bi_end_io = drbd_peer_request_endio; |
45bb912b LE |
1698 | |
1699 | bio->bi_next = bios; | |
1700 | bios = bio; | |
1701 | ++n_bios; | |
1702 | ||
1703 | page_chain_for_each(page) { | |
11f8b2b6 | 1704 | unsigned len = min_t(unsigned, data_size, PAGE_SIZE); |
06efffda | 1705 | if (!bio_add_page(bio, page, len, 0)) |
45bb912b | 1706 | goto next_bio; |
11f8b2b6 | 1707 | data_size -= len; |
45bb912b LE |
1708 | sector += len >> 9; |
1709 | --nr_pages; | |
1710 | } | |
11f8b2b6 | 1711 | D_ASSERT(device, data_size == 0); |
a0fb3c47 | 1712 | D_ASSERT(device, page == NULL); |
45bb912b | 1713 | |
db830c46 | 1714 | atomic_set(&peer_req->pending_bios, n_bios); |
21ae5d7f LE |
1715 | /* for debugfs: update timestamp, mark as submitted */ |
1716 | peer_req->submit_jif = jiffies; | |
1717 | peer_req->flags |= EE_SUBMITTED; | |
45bb912b LE |
1718 | do { |
1719 | bio = bios; | |
1720 | bios = bios->bi_next; | |
1721 | bio->bi_next = NULL; | |
1722 | ||
ce668b6d | 1723 | drbd_submit_bio_noacct(device, peer_request_fault_type(peer_req), bio); |
45bb912b | 1724 | } while (bios); |
45bb912b | 1725 | return 0; |
45bb912b LE |
1726 | } |
1727 | ||
b30ab791 | 1728 | static void drbd_remove_epoch_entry_interval(struct drbd_device *device, |
db830c46 | 1729 | struct drbd_peer_request *peer_req) |
53840641 | 1730 | { |
db830c46 | 1731 | struct drbd_interval *i = &peer_req->i; |
53840641 | 1732 | |
b30ab791 | 1733 | drbd_remove_interval(&device->write_requests, i); |
53840641 AG |
1734 | drbd_clear_interval(i); |
1735 | ||
6c852bec | 1736 | /* Wake up any processes waiting for this peer request to complete. */ |
53840641 | 1737 | if (i->waiting) |
b30ab791 | 1738 | wake_up(&device->misc_wait); |
53840641 AG |
1739 | } |
1740 | ||
bde89a9e | 1741 | static void conn_wait_active_ee_empty(struct drbd_connection *connection) |
77fede51 | 1742 | { |
c06ece6b | 1743 | struct drbd_peer_device *peer_device; |
77fede51 PR |
1744 | int vnr; |
1745 | ||
1746 | rcu_read_lock(); | |
c06ece6b AG |
1747 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
1748 | struct drbd_device *device = peer_device->device; | |
1749 | ||
b30ab791 | 1750 | kref_get(&device->kref); |
77fede51 | 1751 | rcu_read_unlock(); |
b30ab791 | 1752 | drbd_wait_ee_list_empty(device, &device->active_ee); |
05a10ec7 | 1753 | kref_put(&device->kref, drbd_destroy_device); |
77fede51 PR |
1754 | rcu_read_lock(); |
1755 | } | |
1756 | rcu_read_unlock(); | |
1757 | } | |
1758 | ||
bde89a9e | 1759 | static int receive_Barrier(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 1760 | { |
2451fc3b | 1761 | int rv; |
e658983a | 1762 | struct p_barrier *p = pi->data; |
b411b363 PR |
1763 | struct drbd_epoch *epoch; |
1764 | ||
9ed57dcb LE |
1765 | /* FIXME these are unacked on connection, |
1766 | * not a specific (peer)device. | |
1767 | */ | |
bde89a9e AG |
1768 | connection->current_epoch->barrier_nr = p->barrier; |
1769 | connection->current_epoch->connection = connection; | |
1770 | rv = drbd_may_finish_epoch(connection, connection->current_epoch, EV_GOT_BARRIER_NR); | |
b411b363 PR |
1771 | |
1772 | /* P_BARRIER_ACK may imply that the corresponding extent is dropped from | |
1773 | * the activity log, which means it would not be resynced in case the | |
1774 | * R_PRIMARY crashes now. | |
1775 | * Therefore we must send the barrier_ack after the barrier request was | |
1776 | * completed. */ | |
e9526580 | 1777 | switch (connection->resource->write_ordering) { |
f6ba8636 | 1778 | case WO_NONE: |
b411b363 | 1779 | if (rv == FE_RECYCLED) |
82bc0194 | 1780 | return 0; |
2451fc3b PR |
1781 | |
1782 | /* receiver context, in the writeout path of the other node. | |
1783 | * avoid potential distributed deadlock */ | |
1784 | epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); | |
1785 | if (epoch) | |
1786 | break; | |
1787 | else | |
1ec861eb | 1788 | drbd_warn(connection, "Allocation of an epoch failed, slowing down\n"); |
df561f66 | 1789 | fallthrough; |
b411b363 | 1790 | |
f6ba8636 AG |
1791 | case WO_BDEV_FLUSH: |
1792 | case WO_DRAIN_IO: | |
bde89a9e AG |
1793 | conn_wait_active_ee_empty(connection); |
1794 | drbd_flush(connection); | |
2451fc3b | 1795 | |
bde89a9e | 1796 | if (atomic_read(&connection->current_epoch->epoch_size)) { |
2451fc3b PR |
1797 | epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); |
1798 | if (epoch) | |
1799 | break; | |
b411b363 PR |
1800 | } |
1801 | ||
82bc0194 | 1802 | return 0; |
2451fc3b | 1803 | default: |
e9526580 PR |
1804 | drbd_err(connection, "Strangeness in connection->write_ordering %d\n", |
1805 | connection->resource->write_ordering); | |
82bc0194 | 1806 | return -EIO; |
b411b363 PR |
1807 | } |
1808 | ||
1809 | epoch->flags = 0; | |
1810 | atomic_set(&epoch->epoch_size, 0); | |
1811 | atomic_set(&epoch->active, 0); | |
1812 | ||
bde89a9e AG |
1813 | spin_lock(&connection->epoch_lock); |
1814 | if (atomic_read(&connection->current_epoch->epoch_size)) { | |
1815 | list_add(&epoch->list, &connection->current_epoch->list); | |
1816 | connection->current_epoch = epoch; | |
1817 | connection->epochs++; | |
b411b363 PR |
1818 | } else { |
1819 | /* The current_epoch got recycled while we allocated this one... */ | |
1820 | kfree(epoch); | |
1821 | } | |
bde89a9e | 1822 | spin_unlock(&connection->epoch_lock); |
b411b363 | 1823 | |
82bc0194 | 1824 | return 0; |
b411b363 PR |
1825 | } |
1826 | ||
9104d31a | 1827 | /* quick wrapper in case payload size != request_size (write same) */ |
3d0e6375 | 1828 | static void drbd_csum_ee_size(struct crypto_shash *h, |
9104d31a LE |
1829 | struct drbd_peer_request *r, void *d, |
1830 | unsigned int payload_size) | |
1831 | { | |
1832 | unsigned int tmp = r->i.size; | |
1833 | r->i.size = payload_size; | |
1834 | drbd_csum_ee(h, r, d); | |
1835 | r->i.size = tmp; | |
1836 | } | |
1837 | ||
b411b363 | 1838 | /* used from receive_RSDataReply (recv_resync_read) |
9104d31a LE |
1839 | * and from receive_Data. |
1840 | * data_size: actual payload ("data in") | |
1841 | * for normal writes that is bi_size. | |
1842 | * for discards, that is zero. | |
1843 | * for write same, it is logical_block_size. | |
1844 | * both trim and write same have the bi_size ("data len to be affected") | |
1845 | * as extra argument in the packet header. | |
1846 | */ | |
f6ffca9f | 1847 | static struct drbd_peer_request * |
69a22773 | 1848 | read_in_block(struct drbd_peer_device *peer_device, u64 id, sector_t sector, |
a0fb3c47 | 1849 | struct packet_info *pi) __must_hold(local) |
b411b363 | 1850 | { |
69a22773 | 1851 | struct drbd_device *device = peer_device->device; |
155bd9d1 | 1852 | const sector_t capacity = get_capacity(device->vdisk); |
db830c46 | 1853 | struct drbd_peer_request *peer_req; |
b411b363 | 1854 | struct page *page; |
11f8b2b6 AG |
1855 | int digest_size, err; |
1856 | unsigned int data_size = pi->size, ds; | |
69a22773 AG |
1857 | void *dig_in = peer_device->connection->int_dig_in; |
1858 | void *dig_vv = peer_device->connection->int_dig_vv; | |
6b4388ac | 1859 | unsigned long *data; |
a0fb3c47 | 1860 | struct p_trim *trim = (pi->cmd == P_TRIM) ? pi->data : NULL; |
f31e583a | 1861 | struct p_trim *zeroes = (pi->cmd == P_ZEROES) ? pi->data : NULL; |
b411b363 | 1862 | |
11f8b2b6 | 1863 | digest_size = 0; |
a0fb3c47 | 1864 | if (!trim && peer_device->connection->peer_integrity_tfm) { |
3d0e6375 | 1865 | digest_size = crypto_shash_digestsize(peer_device->connection->peer_integrity_tfm); |
9f5bdc33 AG |
1866 | /* |
1867 | * FIXME: Receive the incoming digest into the receive buffer | |
1868 | * here, together with its struct p_data? | |
1869 | */ | |
11f8b2b6 | 1870 | err = drbd_recv_all_warn(peer_device->connection, dig_in, digest_size); |
a5c31904 | 1871 | if (err) |
b411b363 | 1872 | return NULL; |
11f8b2b6 | 1873 | data_size -= digest_size; |
b411b363 PR |
1874 | } |
1875 | ||
a34592ff | 1876 | /* assume request_size == data_size, but special case trim. */ |
9104d31a | 1877 | ds = data_size; |
a0fb3c47 | 1878 | if (trim) { |
677b3672 | 1879 | if (!expect(peer_device, data_size == 0)) |
9104d31a LE |
1880 | return NULL; |
1881 | ds = be32_to_cpu(trim->size); | |
f31e583a | 1882 | } else if (zeroes) { |
677b3672 | 1883 | if (!expect(peer_device, data_size == 0)) |
f31e583a LE |
1884 | return NULL; |
1885 | ds = be32_to_cpu(zeroes->size); | |
a0fb3c47 LE |
1886 | } |
1887 | ||
677b3672 | 1888 | if (!expect(peer_device, IS_ALIGNED(ds, 512))) |
841ce241 | 1889 | return NULL; |
a34592ff | 1890 | if (trim || zeroes) { |
677b3672 | 1891 | if (!expect(peer_device, ds <= (DRBD_MAX_BBIO_SECTORS << 9))) |
9104d31a | 1892 | return NULL; |
677b3672 | 1893 | } else if (!expect(peer_device, ds <= DRBD_MAX_BIO_SIZE)) |
841ce241 | 1894 | return NULL; |
b411b363 | 1895 | |
6666032a LE |
1896 | /* even though we trust out peer, |
1897 | * we sometimes have to double check. */ | |
9104d31a | 1898 | if (sector + (ds>>9) > capacity) { |
d0180171 | 1899 | drbd_err(device, "request from peer beyond end of local disk: " |
fdda6544 | 1900 | "capacity: %llus < sector: %llus + size: %u\n", |
6666032a | 1901 | (unsigned long long)capacity, |
9104d31a | 1902 | (unsigned long long)sector, ds); |
6666032a LE |
1903 | return NULL; |
1904 | } | |
1905 | ||
b411b363 PR |
1906 | /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD |
1907 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
1908 | * which in turn might block on the other node at this very place. */ | |
9104d31a | 1909 | peer_req = drbd_alloc_peer_req(peer_device, id, sector, ds, data_size, GFP_NOIO); |
db830c46 | 1910 | if (!peer_req) |
b411b363 | 1911 | return NULL; |
45bb912b | 1912 | |
21ae5d7f | 1913 | peer_req->flags |= EE_WRITE; |
9104d31a | 1914 | if (trim) { |
f31e583a LE |
1915 | peer_req->flags |= EE_TRIM; |
1916 | return peer_req; | |
1917 | } | |
1918 | if (zeroes) { | |
1919 | peer_req->flags |= EE_ZEROOUT; | |
81a3537a | 1920 | return peer_req; |
9104d31a | 1921 | } |
a73ff323 | 1922 | |
9104d31a | 1923 | /* receive payload size bytes into page chain */ |
b411b363 | 1924 | ds = data_size; |
db830c46 | 1925 | page = peer_req->pages; |
45bb912b LE |
1926 | page_chain_for_each(page) { |
1927 | unsigned len = min_t(int, ds, PAGE_SIZE); | |
6b4388ac | 1928 | data = kmap(page); |
69a22773 | 1929 | err = drbd_recv_all_warn(peer_device->connection, data, len); |
b30ab791 | 1930 | if (drbd_insert_fault(device, DRBD_FAULT_RECEIVE)) { |
d0180171 | 1931 | drbd_err(device, "Fault injection: Corrupting data on receive\n"); |
6b4388ac PR |
1932 | data[0] = data[0] ^ (unsigned long)-1; |
1933 | } | |
b411b363 | 1934 | kunmap(page); |
a5c31904 | 1935 | if (err) { |
b30ab791 | 1936 | drbd_free_peer_req(device, peer_req); |
b411b363 PR |
1937 | return NULL; |
1938 | } | |
a5c31904 | 1939 | ds -= len; |
b411b363 PR |
1940 | } |
1941 | ||
11f8b2b6 | 1942 | if (digest_size) { |
9104d31a | 1943 | drbd_csum_ee_size(peer_device->connection->peer_integrity_tfm, peer_req, dig_vv, data_size); |
11f8b2b6 | 1944 | if (memcmp(dig_in, dig_vv, digest_size)) { |
d0180171 | 1945 | drbd_err(device, "Digest integrity check FAILED: %llus +%u\n", |
470be44a | 1946 | (unsigned long long)sector, data_size); |
b30ab791 | 1947 | drbd_free_peer_req(device, peer_req); |
b411b363 PR |
1948 | return NULL; |
1949 | } | |
1950 | } | |
11f8b2b6 | 1951 | device->recv_cnt += data_size >> 9; |
db830c46 | 1952 | return peer_req; |
b411b363 PR |
1953 | } |
1954 | ||
1955 | /* drbd_drain_block() just takes a data block | |
1956 | * out of the socket input buffer, and discards it. | |
1957 | */ | |
69a22773 | 1958 | static int drbd_drain_block(struct drbd_peer_device *peer_device, int data_size) |
b411b363 PR |
1959 | { |
1960 | struct page *page; | |
a5c31904 | 1961 | int err = 0; |
b411b363 PR |
1962 | void *data; |
1963 | ||
c3470cde | 1964 | if (!data_size) |
fc5be839 | 1965 | return 0; |
c3470cde | 1966 | |
69a22773 | 1967 | page = drbd_alloc_pages(peer_device, 1, 1); |
b411b363 PR |
1968 | |
1969 | data = kmap(page); | |
1970 | while (data_size) { | |
fc5be839 AG |
1971 | unsigned int len = min_t(int, data_size, PAGE_SIZE); |
1972 | ||
69a22773 | 1973 | err = drbd_recv_all_warn(peer_device->connection, data, len); |
a5c31904 | 1974 | if (err) |
b411b363 | 1975 | break; |
a5c31904 | 1976 | data_size -= len; |
b411b363 PR |
1977 | } |
1978 | kunmap(page); | |
69a22773 | 1979 | drbd_free_pages(peer_device->device, page, 0); |
fc5be839 | 1980 | return err; |
b411b363 PR |
1981 | } |
1982 | ||
69a22773 | 1983 | static int recv_dless_read(struct drbd_peer_device *peer_device, struct drbd_request *req, |
b411b363 PR |
1984 | sector_t sector, int data_size) |
1985 | { | |
7988613b KO |
1986 | struct bio_vec bvec; |
1987 | struct bvec_iter iter; | |
b411b363 | 1988 | struct bio *bio; |
11f8b2b6 | 1989 | int digest_size, err, expect; |
69a22773 AG |
1990 | void *dig_in = peer_device->connection->int_dig_in; |
1991 | void *dig_vv = peer_device->connection->int_dig_vv; | |
b411b363 | 1992 | |
11f8b2b6 | 1993 | digest_size = 0; |
69a22773 | 1994 | if (peer_device->connection->peer_integrity_tfm) { |
3d0e6375 | 1995 | digest_size = crypto_shash_digestsize(peer_device->connection->peer_integrity_tfm); |
11f8b2b6 | 1996 | err = drbd_recv_all_warn(peer_device->connection, dig_in, digest_size); |
a5c31904 AG |
1997 | if (err) |
1998 | return err; | |
11f8b2b6 | 1999 | data_size -= digest_size; |
b411b363 PR |
2000 | } |
2001 | ||
b411b363 PR |
2002 | /* optimistically update recv_cnt. if receiving fails below, |
2003 | * we disconnect anyways, and counters will be reset. */ | |
69a22773 | 2004 | peer_device->device->recv_cnt += data_size>>9; |
b411b363 PR |
2005 | |
2006 | bio = req->master_bio; | |
69a22773 | 2007 | D_ASSERT(peer_device->device, sector == bio->bi_iter.bi_sector); |
b411b363 | 2008 | |
7988613b | 2009 | bio_for_each_segment(bvec, bio, iter) { |
3eddaa60 | 2010 | void *mapped = bvec_kmap_local(&bvec); |
7988613b | 2011 | expect = min_t(int, data_size, bvec.bv_len); |
69a22773 | 2012 | err = drbd_recv_all_warn(peer_device->connection, mapped, expect); |
3eddaa60 | 2013 | kunmap_local(mapped); |
a5c31904 AG |
2014 | if (err) |
2015 | return err; | |
2016 | data_size -= expect; | |
b411b363 PR |
2017 | } |
2018 | ||
11f8b2b6 | 2019 | if (digest_size) { |
69a22773 | 2020 | drbd_csum_bio(peer_device->connection->peer_integrity_tfm, bio, dig_vv); |
11f8b2b6 | 2021 | if (memcmp(dig_in, dig_vv, digest_size)) { |
69a22773 | 2022 | drbd_err(peer_device, "Digest integrity check FAILED. Broken NICs?\n"); |
28284cef | 2023 | return -EINVAL; |
b411b363 PR |
2024 | } |
2025 | } | |
2026 | ||
69a22773 | 2027 | D_ASSERT(peer_device->device, data_size == 0); |
28284cef | 2028 | return 0; |
b411b363 PR |
2029 | } |
2030 | ||
a990be46 | 2031 | /* |
668700b4 | 2032 | * e_end_resync_block() is called in ack_sender context via |
a990be46 AG |
2033 | * drbd_finish_peer_reqs(). |
2034 | */ | |
99920dc5 | 2035 | static int e_end_resync_block(struct drbd_work *w, int unused) |
b411b363 | 2036 | { |
8050e6d0 | 2037 | struct drbd_peer_request *peer_req = |
a8cd15ba AG |
2038 | container_of(w, struct drbd_peer_request, w); |
2039 | struct drbd_peer_device *peer_device = peer_req->peer_device; | |
2040 | struct drbd_device *device = peer_device->device; | |
db830c46 | 2041 | sector_t sector = peer_req->i.sector; |
99920dc5 | 2042 | int err; |
b411b363 | 2043 | |
0b0ba1ef | 2044 | D_ASSERT(device, drbd_interval_empty(&peer_req->i)); |
b411b363 | 2045 | |
db830c46 | 2046 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
b30ab791 | 2047 | drbd_set_in_sync(device, sector, peer_req->i.size); |
a8cd15ba | 2048 | err = drbd_send_ack(peer_device, P_RS_WRITE_ACK, peer_req); |
b411b363 PR |
2049 | } else { |
2050 | /* Record failure to sync */ | |
b30ab791 | 2051 | drbd_rs_failed_io(device, sector, peer_req->i.size); |
b411b363 | 2052 | |
a8cd15ba | 2053 | err = drbd_send_ack(peer_device, P_NEG_ACK, peer_req); |
b411b363 | 2054 | } |
b30ab791 | 2055 | dec_unacked(device); |
b411b363 | 2056 | |
99920dc5 | 2057 | return err; |
b411b363 PR |
2058 | } |
2059 | ||
69a22773 | 2060 | static int recv_resync_read(struct drbd_peer_device *peer_device, sector_t sector, |
a0fb3c47 | 2061 | struct packet_info *pi) __releases(local) |
b411b363 | 2062 | { |
69a22773 | 2063 | struct drbd_device *device = peer_device->device; |
db830c46 | 2064 | struct drbd_peer_request *peer_req; |
b411b363 | 2065 | |
a0fb3c47 | 2066 | peer_req = read_in_block(peer_device, ID_SYNCER, sector, pi); |
db830c46 | 2067 | if (!peer_req) |
45bb912b | 2068 | goto fail; |
b411b363 | 2069 | |
b30ab791 | 2070 | dec_rs_pending(device); |
b411b363 | 2071 | |
b30ab791 | 2072 | inc_unacked(device); |
b411b363 PR |
2073 | /* corresponding dec_unacked() in e_end_resync_block() |
2074 | * respective _drbd_clear_done_ee */ | |
2075 | ||
a8cd15ba | 2076 | peer_req->w.cb = e_end_resync_block; |
ce668b6d | 2077 | peer_req->opf = REQ_OP_WRITE; |
21ae5d7f | 2078 | peer_req->submit_jif = jiffies; |
45bb912b | 2079 | |
0500813f | 2080 | spin_lock_irq(&device->resource->req_lock); |
b9ed7080 | 2081 | list_add_tail(&peer_req->w.list, &device->sync_ee); |
0500813f | 2082 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 | 2083 | |
a0fb3c47 | 2084 | atomic_add(pi->size >> 9, &device->rs_sect_ev); |
ce668b6d | 2085 | if (drbd_submit_peer_request(peer_req) == 0) |
e1c1b0fc | 2086 | return 0; |
b411b363 | 2087 | |
10f6d992 | 2088 | /* don't care for the reason here */ |
d0180171 | 2089 | drbd_err(device, "submit failed, triggering re-connect\n"); |
0500813f | 2090 | spin_lock_irq(&device->resource->req_lock); |
a8cd15ba | 2091 | list_del(&peer_req->w.list); |
0500813f | 2092 | spin_unlock_irq(&device->resource->req_lock); |
22cc37a9 | 2093 | |
b30ab791 | 2094 | drbd_free_peer_req(device, peer_req); |
45bb912b | 2095 | fail: |
b30ab791 | 2096 | put_ldev(device); |
e1c1b0fc | 2097 | return -EIO; |
b411b363 PR |
2098 | } |
2099 | ||
668eebc6 | 2100 | static struct drbd_request * |
b30ab791 | 2101 | find_request(struct drbd_device *device, struct rb_root *root, u64 id, |
bc9c5c41 | 2102 | sector_t sector, bool missing_ok, const char *func) |
51624585 | 2103 | { |
51624585 AG |
2104 | struct drbd_request *req; |
2105 | ||
bc9c5c41 AG |
2106 | /* Request object according to our peer */ |
2107 | req = (struct drbd_request *)(unsigned long)id; | |
5e472264 | 2108 | if (drbd_contains_interval(root, sector, &req->i) && req->i.local) |
668eebc6 | 2109 | return req; |
c3afd8f5 | 2110 | if (!missing_ok) { |
d0180171 | 2111 | drbd_err(device, "%s: failed to find request 0x%lx, sector %llus\n", func, |
c3afd8f5 AG |
2112 | (unsigned long)id, (unsigned long long)sector); |
2113 | } | |
51624585 | 2114 | return NULL; |
b411b363 PR |
2115 | } |
2116 | ||
bde89a9e | 2117 | static int receive_DataReply(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 2118 | { |
9f4fe9ad | 2119 | struct drbd_peer_device *peer_device; |
b30ab791 | 2120 | struct drbd_device *device; |
b411b363 PR |
2121 | struct drbd_request *req; |
2122 | sector_t sector; | |
82bc0194 | 2123 | int err; |
e658983a | 2124 | struct p_data *p = pi->data; |
4a76b161 | 2125 | |
9f4fe9ad AG |
2126 | peer_device = conn_peer_device(connection, pi->vnr); |
2127 | if (!peer_device) | |
4a76b161 | 2128 | return -EIO; |
9f4fe9ad | 2129 | device = peer_device->device; |
b411b363 PR |
2130 | |
2131 | sector = be64_to_cpu(p->sector); | |
2132 | ||
0500813f | 2133 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 | 2134 | req = find_request(device, &device->read_requests, p->block_id, sector, false, __func__); |
0500813f | 2135 | spin_unlock_irq(&device->resource->req_lock); |
c3afd8f5 | 2136 | if (unlikely(!req)) |
82bc0194 | 2137 | return -EIO; |
b411b363 | 2138 | |
69a22773 | 2139 | err = recv_dless_read(peer_device, req, sector, pi->size); |
82bc0194 | 2140 | if (!err) |
8554df1c | 2141 | req_mod(req, DATA_RECEIVED); |
b411b363 PR |
2142 | /* else: nothing. handled from drbd_disconnect... |
2143 | * I don't think we may complete this just yet | |
2144 | * in case we are "on-disconnect: freeze" */ | |
2145 | ||
82bc0194 | 2146 | return err; |
b411b363 PR |
2147 | } |
2148 | ||
bde89a9e | 2149 | static int receive_RSDataReply(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 2150 | { |
9f4fe9ad | 2151 | struct drbd_peer_device *peer_device; |
b30ab791 | 2152 | struct drbd_device *device; |
b411b363 | 2153 | sector_t sector; |
82bc0194 | 2154 | int err; |
e658983a | 2155 | struct p_data *p = pi->data; |
4a76b161 | 2156 | |
9f4fe9ad AG |
2157 | peer_device = conn_peer_device(connection, pi->vnr); |
2158 | if (!peer_device) | |
4a76b161 | 2159 | return -EIO; |
9f4fe9ad | 2160 | device = peer_device->device; |
b411b363 PR |
2161 | |
2162 | sector = be64_to_cpu(p->sector); | |
0b0ba1ef | 2163 | D_ASSERT(device, p->block_id == ID_SYNCER); |
b411b363 | 2164 | |
b30ab791 | 2165 | if (get_ldev(device)) { |
b411b363 PR |
2166 | /* data is submitted to disk within recv_resync_read. |
2167 | * corresponding put_ldev done below on error, | |
fcefa62e | 2168 | * or in drbd_peer_request_endio. */ |
a0fb3c47 | 2169 | err = recv_resync_read(peer_device, sector, pi); |
b411b363 | 2170 | } else { |
e3fa02d7 | 2171 | if (drbd_ratelimit()) |
d0180171 | 2172 | drbd_err(device, "Can not write resync data to local disk.\n"); |
b411b363 | 2173 | |
69a22773 | 2174 | err = drbd_drain_block(peer_device, pi->size); |
b411b363 | 2175 | |
69a22773 | 2176 | drbd_send_ack_dp(peer_device, P_NEG_ACK, p, pi->size); |
b411b363 PR |
2177 | } |
2178 | ||
b30ab791 | 2179 | atomic_add(pi->size >> 9, &device->rs_sect_in); |
778f271d | 2180 | |
82bc0194 | 2181 | return err; |
b411b363 PR |
2182 | } |
2183 | ||
b30ab791 | 2184 | static void restart_conflicting_writes(struct drbd_device *device, |
7be8da07 | 2185 | sector_t sector, int size) |
b411b363 | 2186 | { |
7be8da07 AG |
2187 | struct drbd_interval *i; |
2188 | struct drbd_request *req; | |
2189 | ||
b30ab791 | 2190 | drbd_for_each_overlap(i, &device->write_requests, sector, size) { |
7be8da07 AG |
2191 | if (!i->local) |
2192 | continue; | |
2193 | req = container_of(i, struct drbd_request, i); | |
2194 | if (req->rq_state & RQ_LOCAL_PENDING || | |
2195 | !(req->rq_state & RQ_POSTPONED)) | |
2196 | continue; | |
2312f0b3 LE |
2197 | /* as it is RQ_POSTPONED, this will cause it to |
2198 | * be queued on the retry workqueue. */ | |
d4dabbe2 | 2199 | __req_mod(req, CONFLICT_RESOLVED, NULL); |
7be8da07 AG |
2200 | } |
2201 | } | |
b411b363 | 2202 | |
a990be46 | 2203 | /* |
668700b4 | 2204 | * e_end_block() is called in ack_sender context via drbd_finish_peer_reqs(). |
b411b363 | 2205 | */ |
99920dc5 | 2206 | static int e_end_block(struct drbd_work *w, int cancel) |
b411b363 | 2207 | { |
8050e6d0 | 2208 | struct drbd_peer_request *peer_req = |
a8cd15ba AG |
2209 | container_of(w, struct drbd_peer_request, w); |
2210 | struct drbd_peer_device *peer_device = peer_req->peer_device; | |
2211 | struct drbd_device *device = peer_device->device; | |
db830c46 | 2212 | sector_t sector = peer_req->i.sector; |
99920dc5 | 2213 | int err = 0, pcmd; |
b411b363 | 2214 | |
303d1448 | 2215 | if (peer_req->flags & EE_SEND_WRITE_ACK) { |
db830c46 | 2216 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
b30ab791 AG |
2217 | pcmd = (device->state.conn >= C_SYNC_SOURCE && |
2218 | device->state.conn <= C_PAUSED_SYNC_T && | |
db830c46 | 2219 | peer_req->flags & EE_MAY_SET_IN_SYNC) ? |
b411b363 | 2220 | P_RS_WRITE_ACK : P_WRITE_ACK; |
a8cd15ba | 2221 | err = drbd_send_ack(peer_device, pcmd, peer_req); |
b411b363 | 2222 | if (pcmd == P_RS_WRITE_ACK) |
b30ab791 | 2223 | drbd_set_in_sync(device, sector, peer_req->i.size); |
b411b363 | 2224 | } else { |
a8cd15ba | 2225 | err = drbd_send_ack(peer_device, P_NEG_ACK, peer_req); |
b411b363 PR |
2226 | /* we expect it to be marked out of sync anyways... |
2227 | * maybe assert this? */ | |
2228 | } | |
b30ab791 | 2229 | dec_unacked(device); |
b411b363 | 2230 | } |
08d0dabf | 2231 | |
b411b363 PR |
2232 | /* we delete from the conflict detection hash _after_ we sent out the |
2233 | * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ | |
302bdeae | 2234 | if (peer_req->flags & EE_IN_INTERVAL_TREE) { |
0500813f | 2235 | spin_lock_irq(&device->resource->req_lock); |
0b0ba1ef | 2236 | D_ASSERT(device, !drbd_interval_empty(&peer_req->i)); |
b30ab791 | 2237 | drbd_remove_epoch_entry_interval(device, peer_req); |
7be8da07 | 2238 | if (peer_req->flags & EE_RESTART_REQUESTS) |
b30ab791 | 2239 | restart_conflicting_writes(device, sector, peer_req->i.size); |
0500813f | 2240 | spin_unlock_irq(&device->resource->req_lock); |
bb3bfe96 | 2241 | } else |
0b0ba1ef | 2242 | D_ASSERT(device, drbd_interval_empty(&peer_req->i)); |
b411b363 | 2243 | |
5dd2ca19 | 2244 | drbd_may_finish_epoch(peer_device->connection, peer_req->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); |
b411b363 | 2245 | |
99920dc5 | 2246 | return err; |
b411b363 PR |
2247 | } |
2248 | ||
a8cd15ba | 2249 | static int e_send_ack(struct drbd_work *w, enum drbd_packet ack) |
b411b363 | 2250 | { |
8050e6d0 | 2251 | struct drbd_peer_request *peer_req = |
a8cd15ba AG |
2252 | container_of(w, struct drbd_peer_request, w); |
2253 | struct drbd_peer_device *peer_device = peer_req->peer_device; | |
99920dc5 | 2254 | int err; |
b411b363 | 2255 | |
a8cd15ba AG |
2256 | err = drbd_send_ack(peer_device, ack, peer_req); |
2257 | dec_unacked(peer_device->device); | |
b411b363 | 2258 | |
99920dc5 | 2259 | return err; |
b411b363 PR |
2260 | } |
2261 | ||
d4dabbe2 | 2262 | static int e_send_superseded(struct drbd_work *w, int unused) |
7be8da07 | 2263 | { |
a8cd15ba | 2264 | return e_send_ack(w, P_SUPERSEDED); |
7be8da07 AG |
2265 | } |
2266 | ||
99920dc5 | 2267 | static int e_send_retry_write(struct drbd_work *w, int unused) |
7be8da07 | 2268 | { |
a8cd15ba AG |
2269 | struct drbd_peer_request *peer_req = |
2270 | container_of(w, struct drbd_peer_request, w); | |
2271 | struct drbd_connection *connection = peer_req->peer_device->connection; | |
7be8da07 | 2272 | |
a8cd15ba | 2273 | return e_send_ack(w, connection->agreed_pro_version >= 100 ? |
d4dabbe2 | 2274 | P_RETRY_WRITE : P_SUPERSEDED); |
7be8da07 | 2275 | } |
b411b363 | 2276 | |
3e394da1 AG |
2277 | static bool seq_greater(u32 a, u32 b) |
2278 | { | |
2279 | /* | |
2280 | * We assume 32-bit wrap-around here. | |
2281 | * For 24-bit wrap-around, we would have to shift: | |
2282 | * a <<= 8; b <<= 8; | |
2283 | */ | |
2284 | return (s32)a - (s32)b > 0; | |
2285 | } | |
b411b363 | 2286 | |
3e394da1 AG |
2287 | static u32 seq_max(u32 a, u32 b) |
2288 | { | |
2289 | return seq_greater(a, b) ? a : b; | |
b411b363 PR |
2290 | } |
2291 | ||
69a22773 | 2292 | static void update_peer_seq(struct drbd_peer_device *peer_device, unsigned int peer_seq) |
3e394da1 | 2293 | { |
69a22773 | 2294 | struct drbd_device *device = peer_device->device; |
3c13b680 | 2295 | unsigned int newest_peer_seq; |
3e394da1 | 2296 | |
69a22773 | 2297 | if (test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags)) { |
b30ab791 AG |
2298 | spin_lock(&device->peer_seq_lock); |
2299 | newest_peer_seq = seq_max(device->peer_seq, peer_seq); | |
2300 | device->peer_seq = newest_peer_seq; | |
2301 | spin_unlock(&device->peer_seq_lock); | |
2302 | /* wake up only if we actually changed device->peer_seq */ | |
3c13b680 | 2303 | if (peer_seq == newest_peer_seq) |
b30ab791 | 2304 | wake_up(&device->seq_wait); |
7be8da07 | 2305 | } |
b411b363 PR |
2306 | } |
2307 | ||
d93f6302 | 2308 | static inline int overlaps(sector_t s1, int l1, sector_t s2, int l2) |
b6a370ba | 2309 | { |
d93f6302 LE |
2310 | return !((s1 + (l1>>9) <= s2) || (s1 >= s2 + (l2>>9))); |
2311 | } | |
b6a370ba | 2312 | |
d93f6302 | 2313 | /* maybe change sync_ee into interval trees as well? */ |
b30ab791 | 2314 | static bool overlapping_resync_write(struct drbd_device *device, struct drbd_peer_request *peer_req) |
d93f6302 LE |
2315 | { |
2316 | struct drbd_peer_request *rs_req; | |
7e5fec31 | 2317 | bool rv = false; |
b6a370ba | 2318 | |
0500813f | 2319 | spin_lock_irq(&device->resource->req_lock); |
a8cd15ba | 2320 | list_for_each_entry(rs_req, &device->sync_ee, w.list) { |
d93f6302 LE |
2321 | if (overlaps(peer_req->i.sector, peer_req->i.size, |
2322 | rs_req->i.sector, rs_req->i.size)) { | |
7e5fec31 | 2323 | rv = true; |
b6a370ba PR |
2324 | break; |
2325 | } | |
2326 | } | |
0500813f | 2327 | spin_unlock_irq(&device->resource->req_lock); |
b6a370ba PR |
2328 | |
2329 | return rv; | |
2330 | } | |
2331 | ||
b411b363 PR |
2332 | /* Called from receive_Data. |
2333 | * Synchronize packets on sock with packets on msock. | |
2334 | * | |
2335 | * This is here so even when a P_DATA packet traveling via sock overtook an Ack | |
2336 | * packet traveling on msock, they are still processed in the order they have | |
2337 | * been sent. | |
2338 | * | |
2339 | * Note: we don't care for Ack packets overtaking P_DATA packets. | |
2340 | * | |
b30ab791 | 2341 | * In case packet_seq is larger than device->peer_seq number, there are |
b411b363 | 2342 | * outstanding packets on the msock. We wait for them to arrive. |
b30ab791 | 2343 | * In case we are the logically next packet, we update device->peer_seq |
b411b363 PR |
2344 | * ourselves. Correctly handles 32bit wrap around. |
2345 | * | |
2346 | * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, | |
2347 | * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds | |
2348 | * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have | |
2349 | * 1<<9 == 512 seconds aka ages for the 32bit wrap around... | |
2350 | * | |
2351 | * returns 0 if we may process the packet, | |
2352 | * -ERESTARTSYS if we were interrupted (by disconnect signal). */ | |
69a22773 | 2353 | static int wait_for_and_update_peer_seq(struct drbd_peer_device *peer_device, const u32 peer_seq) |
b411b363 | 2354 | { |
69a22773 | 2355 | struct drbd_device *device = peer_device->device; |
b411b363 | 2356 | DEFINE_WAIT(wait); |
b411b363 | 2357 | long timeout; |
b874d231 | 2358 | int ret = 0, tp; |
7be8da07 | 2359 | |
69a22773 | 2360 | if (!test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags)) |
7be8da07 AG |
2361 | return 0; |
2362 | ||
b30ab791 | 2363 | spin_lock(&device->peer_seq_lock); |
b411b363 | 2364 | for (;;) { |
b30ab791 AG |
2365 | if (!seq_greater(peer_seq - 1, device->peer_seq)) { |
2366 | device->peer_seq = seq_max(device->peer_seq, peer_seq); | |
b411b363 | 2367 | break; |
7be8da07 | 2368 | } |
b874d231 | 2369 | |
b411b363 PR |
2370 | if (signal_pending(current)) { |
2371 | ret = -ERESTARTSYS; | |
2372 | break; | |
2373 | } | |
b874d231 PR |
2374 | |
2375 | rcu_read_lock(); | |
5dd2ca19 | 2376 | tp = rcu_dereference(peer_device->connection->net_conf)->two_primaries; |
b874d231 PR |
2377 | rcu_read_unlock(); |
2378 | ||
2379 | if (!tp) | |
2380 | break; | |
2381 | ||
2382 | /* Only need to wait if two_primaries is enabled */ | |
b30ab791 AG |
2383 | prepare_to_wait(&device->seq_wait, &wait, TASK_INTERRUPTIBLE); |
2384 | spin_unlock(&device->peer_seq_lock); | |
44ed167d | 2385 | rcu_read_lock(); |
69a22773 | 2386 | timeout = rcu_dereference(peer_device->connection->net_conf)->ping_timeo*HZ/10; |
44ed167d | 2387 | rcu_read_unlock(); |
71b1c1eb | 2388 | timeout = schedule_timeout(timeout); |
b30ab791 | 2389 | spin_lock(&device->peer_seq_lock); |
7be8da07 | 2390 | if (!timeout) { |
b411b363 | 2391 | ret = -ETIMEDOUT; |
d0180171 | 2392 | drbd_err(device, "Timed out waiting for missing ack packets; disconnecting\n"); |
b411b363 PR |
2393 | break; |
2394 | } | |
2395 | } | |
b30ab791 AG |
2396 | spin_unlock(&device->peer_seq_lock); |
2397 | finish_wait(&device->seq_wait, &wait); | |
b411b363 PR |
2398 | return ret; |
2399 | } | |
2400 | ||
9945172a | 2401 | static enum req_op wire_flags_to_bio_op(u32 dpf) |
bb3cc85e | 2402 | { |
f31e583a | 2403 | if (dpf & DP_ZEROES) |
45c21793 | 2404 | return REQ_OP_WRITE_ZEROES; |
f31e583a LE |
2405 | if (dpf & DP_DISCARD) |
2406 | return REQ_OP_DISCARD; | |
bb3cc85e MC |
2407 | else |
2408 | return REQ_OP_WRITE; | |
76d2e7ec PR |
2409 | } |
2410 | ||
ce668b6d CB |
2411 | /* see also bio_flags_to_wire() */ |
2412 | static blk_opf_t wire_flags_to_bio(struct drbd_connection *connection, u32 dpf) | |
2413 | { | |
2414 | return wire_flags_to_bio_op(dpf) | | |
2415 | (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | | |
2416 | (dpf & DP_FUA ? REQ_FUA : 0) | | |
2417 | (dpf & DP_FLUSH ? REQ_PREFLUSH : 0); | |
2418 | } | |
2419 | ||
b30ab791 | 2420 | static void fail_postponed_requests(struct drbd_device *device, sector_t sector, |
7be8da07 AG |
2421 | unsigned int size) |
2422 | { | |
2423 | struct drbd_interval *i; | |
2424 | ||
2425 | repeat: | |
b30ab791 | 2426 | drbd_for_each_overlap(i, &device->write_requests, sector, size) { |
7be8da07 AG |
2427 | struct drbd_request *req; |
2428 | struct bio_and_error m; | |
2429 | ||
2430 | if (!i->local) | |
2431 | continue; | |
2432 | req = container_of(i, struct drbd_request, i); | |
2433 | if (!(req->rq_state & RQ_POSTPONED)) | |
2434 | continue; | |
2435 | req->rq_state &= ~RQ_POSTPONED; | |
2436 | __req_mod(req, NEG_ACKED, &m); | |
0500813f | 2437 | spin_unlock_irq(&device->resource->req_lock); |
7be8da07 | 2438 | if (m.bio) |
b30ab791 | 2439 | complete_master_bio(device, &m); |
0500813f | 2440 | spin_lock_irq(&device->resource->req_lock); |
7be8da07 AG |
2441 | goto repeat; |
2442 | } | |
2443 | } | |
2444 | ||
b30ab791 | 2445 | static int handle_write_conflicts(struct drbd_device *device, |
7be8da07 AG |
2446 | struct drbd_peer_request *peer_req) |
2447 | { | |
e33b32de | 2448 | struct drbd_connection *connection = peer_req->peer_device->connection; |
bde89a9e | 2449 | bool resolve_conflicts = test_bit(RESOLVE_CONFLICTS, &connection->flags); |
7be8da07 AG |
2450 | sector_t sector = peer_req->i.sector; |
2451 | const unsigned int size = peer_req->i.size; | |
2452 | struct drbd_interval *i; | |
2453 | bool equal; | |
2454 | int err; | |
2455 | ||
2456 | /* | |
2457 | * Inserting the peer request into the write_requests tree will prevent | |
2458 | * new conflicting local requests from being added. | |
2459 | */ | |
b30ab791 | 2460 | drbd_insert_interval(&device->write_requests, &peer_req->i); |
7be8da07 AG |
2461 | |
2462 | repeat: | |
b30ab791 | 2463 | drbd_for_each_overlap(i, &device->write_requests, sector, size) { |
7be8da07 AG |
2464 | if (i == &peer_req->i) |
2465 | continue; | |
08d0dabf LE |
2466 | if (i->completed) |
2467 | continue; | |
7be8da07 AG |
2468 | |
2469 | if (!i->local) { | |
2470 | /* | |
2471 | * Our peer has sent a conflicting remote request; this | |
2472 | * should not happen in a two-node setup. Wait for the | |
2473 | * earlier peer request to complete. | |
2474 | */ | |
b30ab791 | 2475 | err = drbd_wait_misc(device, i); |
7be8da07 AG |
2476 | if (err) |
2477 | goto out; | |
2478 | goto repeat; | |
2479 | } | |
2480 | ||
2481 | equal = i->sector == sector && i->size == size; | |
2482 | if (resolve_conflicts) { | |
2483 | /* | |
2484 | * If the peer request is fully contained within the | |
d4dabbe2 LE |
2485 | * overlapping request, it can be considered overwritten |
2486 | * and thus superseded; otherwise, it will be retried | |
2487 | * once all overlapping requests have completed. | |
7be8da07 | 2488 | */ |
d4dabbe2 | 2489 | bool superseded = i->sector <= sector && i->sector + |
7be8da07 AG |
2490 | (i->size >> 9) >= sector + (size >> 9); |
2491 | ||
2492 | if (!equal) | |
d0180171 | 2493 | drbd_alert(device, "Concurrent writes detected: " |
7be8da07 AG |
2494 | "local=%llus +%u, remote=%llus +%u, " |
2495 | "assuming %s came first\n", | |
2496 | (unsigned long long)i->sector, i->size, | |
2497 | (unsigned long long)sector, size, | |
d4dabbe2 | 2498 | superseded ? "local" : "remote"); |
7be8da07 | 2499 | |
a8cd15ba | 2500 | peer_req->w.cb = superseded ? e_send_superseded : |
7be8da07 | 2501 | e_send_retry_write; |
a8cd15ba | 2502 | list_add_tail(&peer_req->w.list, &device->done_ee); |
668700b4 | 2503 | queue_work(connection->ack_sender, &peer_req->peer_device->send_acks_work); |
7be8da07 AG |
2504 | |
2505 | err = -ENOENT; | |
2506 | goto out; | |
2507 | } else { | |
2508 | struct drbd_request *req = | |
2509 | container_of(i, struct drbd_request, i); | |
2510 | ||
2511 | if (!equal) | |
d0180171 | 2512 | drbd_alert(device, "Concurrent writes detected: " |
7be8da07 AG |
2513 | "local=%llus +%u, remote=%llus +%u\n", |
2514 | (unsigned long long)i->sector, i->size, | |
2515 | (unsigned long long)sector, size); | |
2516 | ||
2517 | if (req->rq_state & RQ_LOCAL_PENDING || | |
2518 | !(req->rq_state & RQ_POSTPONED)) { | |
2519 | /* | |
2520 | * Wait for the node with the discard flag to | |
d4dabbe2 LE |
2521 | * decide if this request has been superseded |
2522 | * or needs to be retried. | |
2523 | * Requests that have been superseded will | |
7be8da07 AG |
2524 | * disappear from the write_requests tree. |
2525 | * | |
2526 | * In addition, wait for the conflicting | |
2527 | * request to finish locally before submitting | |
2528 | * the conflicting peer request. | |
2529 | */ | |
b30ab791 | 2530 | err = drbd_wait_misc(device, &req->i); |
7be8da07 | 2531 | if (err) { |
e33b32de | 2532 | _conn_request_state(connection, NS(conn, C_TIMEOUT), CS_HARD); |
b30ab791 | 2533 | fail_postponed_requests(device, sector, size); |
7be8da07 AG |
2534 | goto out; |
2535 | } | |
2536 | goto repeat; | |
2537 | } | |
2538 | /* | |
2539 | * Remember to restart the conflicting requests after | |
2540 | * the new peer request has completed. | |
2541 | */ | |
2542 | peer_req->flags |= EE_RESTART_REQUESTS; | |
2543 | } | |
2544 | } | |
2545 | err = 0; | |
2546 | ||
2547 | out: | |
2548 | if (err) | |
b30ab791 | 2549 | drbd_remove_epoch_entry_interval(device, peer_req); |
7be8da07 AG |
2550 | return err; |
2551 | } | |
2552 | ||
b411b363 | 2553 | /* mirrored write */ |
bde89a9e | 2554 | static int receive_Data(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 2555 | { |
9f4fe9ad | 2556 | struct drbd_peer_device *peer_device; |
b30ab791 | 2557 | struct drbd_device *device; |
21ae5d7f | 2558 | struct net_conf *nc; |
b411b363 | 2559 | sector_t sector; |
db830c46 | 2560 | struct drbd_peer_request *peer_req; |
e658983a | 2561 | struct p_data *p = pi->data; |
7be8da07 | 2562 | u32 peer_seq = be32_to_cpu(p->seq_num); |
b411b363 | 2563 | u32 dp_flags; |
302bdeae | 2564 | int err, tp; |
b411b363 | 2565 | |
9f4fe9ad AG |
2566 | peer_device = conn_peer_device(connection, pi->vnr); |
2567 | if (!peer_device) | |
4a76b161 | 2568 | return -EIO; |
9f4fe9ad | 2569 | device = peer_device->device; |
b411b363 | 2570 | |
b30ab791 | 2571 | if (!get_ldev(device)) { |
82bc0194 AG |
2572 | int err2; |
2573 | ||
69a22773 AG |
2574 | err = wait_for_and_update_peer_seq(peer_device, peer_seq); |
2575 | drbd_send_ack_dp(peer_device, P_NEG_ACK, p, pi->size); | |
bde89a9e | 2576 | atomic_inc(&connection->current_epoch->epoch_size); |
69a22773 | 2577 | err2 = drbd_drain_block(peer_device, pi->size); |
82bc0194 AG |
2578 | if (!err) |
2579 | err = err2; | |
2580 | return err; | |
b411b363 PR |
2581 | } |
2582 | ||
fcefa62e AG |
2583 | /* |
2584 | * Corresponding put_ldev done either below (on various errors), or in | |
2585 | * drbd_peer_request_endio, if we successfully submit the data at the | |
2586 | * end of this function. | |
2587 | */ | |
b411b363 PR |
2588 | |
2589 | sector = be64_to_cpu(p->sector); | |
a0fb3c47 | 2590 | peer_req = read_in_block(peer_device, p->block_id, sector, pi); |
db830c46 | 2591 | if (!peer_req) { |
b30ab791 | 2592 | put_ldev(device); |
82bc0194 | 2593 | return -EIO; |
b411b363 PR |
2594 | } |
2595 | ||
a8cd15ba | 2596 | peer_req->w.cb = e_end_block; |
21ae5d7f LE |
2597 | peer_req->submit_jif = jiffies; |
2598 | peer_req->flags |= EE_APPLICATION; | |
b411b363 | 2599 | |
688593c5 | 2600 | dp_flags = be32_to_cpu(p->dp_flags); |
ce668b6d | 2601 | peer_req->opf = wire_flags_to_bio(connection, dp_flags); |
a0fb3c47 | 2602 | if (pi->cmd == P_TRIM) { |
f31e583a | 2603 | D_ASSERT(peer_device, peer_req->i.size > 0); |
ce668b6d | 2604 | D_ASSERT(peer_device, peer_req_op(peer_req) == REQ_OP_DISCARD); |
f31e583a LE |
2605 | D_ASSERT(peer_device, peer_req->pages == NULL); |
2606 | /* need to play safe: an older DRBD sender | |
2607 | * may mean zero-out while sending P_TRIM. */ | |
2608 | if (0 == (connection->agreed_features & DRBD_FF_WZEROES)) | |
2609 | peer_req->flags |= EE_ZEROOUT; | |
2610 | } else if (pi->cmd == P_ZEROES) { | |
a0fb3c47 | 2611 | D_ASSERT(peer_device, peer_req->i.size > 0); |
ce668b6d | 2612 | D_ASSERT(peer_device, peer_req_op(peer_req) == REQ_OP_WRITE_ZEROES); |
a0fb3c47 | 2613 | D_ASSERT(peer_device, peer_req->pages == NULL); |
f31e583a LE |
2614 | /* Do (not) pass down BLKDEV_ZERO_NOUNMAP? */ |
2615 | if (dp_flags & DP_DISCARD) | |
2616 | peer_req->flags |= EE_TRIM; | |
a0fb3c47 | 2617 | } else if (peer_req->pages == NULL) { |
0b0ba1ef AG |
2618 | D_ASSERT(device, peer_req->i.size == 0); |
2619 | D_ASSERT(device, dp_flags & DP_FLUSH); | |
a73ff323 | 2620 | } |
688593c5 LE |
2621 | |
2622 | if (dp_flags & DP_MAY_SET_IN_SYNC) | |
db830c46 | 2623 | peer_req->flags |= EE_MAY_SET_IN_SYNC; |
688593c5 | 2624 | |
bde89a9e AG |
2625 | spin_lock(&connection->epoch_lock); |
2626 | peer_req->epoch = connection->current_epoch; | |
db830c46 AG |
2627 | atomic_inc(&peer_req->epoch->epoch_size); |
2628 | atomic_inc(&peer_req->epoch->active); | |
bde89a9e | 2629 | spin_unlock(&connection->epoch_lock); |
b411b363 | 2630 | |
302bdeae | 2631 | rcu_read_lock(); |
21ae5d7f LE |
2632 | nc = rcu_dereference(peer_device->connection->net_conf); |
2633 | tp = nc->two_primaries; | |
2634 | if (peer_device->connection->agreed_pro_version < 100) { | |
2635 | switch (nc->wire_protocol) { | |
2636 | case DRBD_PROT_C: | |
2637 | dp_flags |= DP_SEND_WRITE_ACK; | |
2638 | break; | |
2639 | case DRBD_PROT_B: | |
2640 | dp_flags |= DP_SEND_RECEIVE_ACK; | |
2641 | break; | |
2642 | } | |
2643 | } | |
302bdeae | 2644 | rcu_read_unlock(); |
21ae5d7f LE |
2645 | |
2646 | if (dp_flags & DP_SEND_WRITE_ACK) { | |
2647 | peer_req->flags |= EE_SEND_WRITE_ACK; | |
2648 | inc_unacked(device); | |
2649 | /* corresponding dec_unacked() in e_end_block() | |
2650 | * respective _drbd_clear_done_ee */ | |
2651 | } | |
2652 | ||
2653 | if (dp_flags & DP_SEND_RECEIVE_ACK) { | |
2654 | /* I really don't like it that the receiver thread | |
2655 | * sends on the msock, but anyways */ | |
5dd2ca19 | 2656 | drbd_send_ack(peer_device, P_RECV_ACK, peer_req); |
21ae5d7f LE |
2657 | } |
2658 | ||
302bdeae | 2659 | if (tp) { |
21ae5d7f LE |
2660 | /* two primaries implies protocol C */ |
2661 | D_ASSERT(device, dp_flags & DP_SEND_WRITE_ACK); | |
302bdeae | 2662 | peer_req->flags |= EE_IN_INTERVAL_TREE; |
69a22773 | 2663 | err = wait_for_and_update_peer_seq(peer_device, peer_seq); |
7be8da07 | 2664 | if (err) |
b411b363 | 2665 | goto out_interrupted; |
0500813f | 2666 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 | 2667 | err = handle_write_conflicts(device, peer_req); |
7be8da07 | 2668 | if (err) { |
0500813f | 2669 | spin_unlock_irq(&device->resource->req_lock); |
7be8da07 | 2670 | if (err == -ENOENT) { |
b30ab791 | 2671 | put_ldev(device); |
82bc0194 | 2672 | return 0; |
b411b363 | 2673 | } |
7be8da07 | 2674 | goto out_interrupted; |
b411b363 | 2675 | } |
b874d231 | 2676 | } else { |
69a22773 | 2677 | update_peer_seq(peer_device, peer_seq); |
0500813f | 2678 | spin_lock_irq(&device->resource->req_lock); |
b874d231 | 2679 | } |
a34592ff | 2680 | /* TRIM and is processed synchronously, |
9104d31a | 2681 | * we wait for all pending requests, respectively wait for |
a0fb3c47 LE |
2682 | * active_ee to become empty in drbd_submit_peer_request(); |
2683 | * better not add ourselves here. */ | |
a34592ff | 2684 | if ((peer_req->flags & (EE_TRIM | EE_ZEROOUT)) == 0) |
b9ed7080 | 2685 | list_add_tail(&peer_req->w.list, &device->active_ee); |
0500813f | 2686 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 | 2687 | |
b30ab791 AG |
2688 | if (device->state.conn == C_SYNC_TARGET) |
2689 | wait_event(device->ee_wait, !overlapping_resync_write(device, peer_req)); | |
b411b363 | 2690 | |
b30ab791 | 2691 | if (device->state.pdsk < D_INCONSISTENT) { |
b411b363 | 2692 | /* In case we have the only disk of the cluster, */ |
b30ab791 | 2693 | drbd_set_out_of_sync(device, peer_req->i.sector, peer_req->i.size); |
db830c46 | 2694 | peer_req->flags &= ~EE_MAY_SET_IN_SYNC; |
4dd726f0 | 2695 | drbd_al_begin_io(device, &peer_req->i); |
21ae5d7f | 2696 | peer_req->flags |= EE_CALL_AL_COMPLETE_IO; |
b411b363 PR |
2697 | } |
2698 | ||
ce668b6d | 2699 | err = drbd_submit_peer_request(peer_req); |
82bc0194 AG |
2700 | if (!err) |
2701 | return 0; | |
b411b363 | 2702 | |
10f6d992 | 2703 | /* don't care for the reason here */ |
d0180171 | 2704 | drbd_err(device, "submit failed, triggering re-connect\n"); |
0500813f | 2705 | spin_lock_irq(&device->resource->req_lock); |
a8cd15ba | 2706 | list_del(&peer_req->w.list); |
b30ab791 | 2707 | drbd_remove_epoch_entry_interval(device, peer_req); |
0500813f | 2708 | spin_unlock_irq(&device->resource->req_lock); |
21ae5d7f LE |
2709 | if (peer_req->flags & EE_CALL_AL_COMPLETE_IO) { |
2710 | peer_req->flags &= ~EE_CALL_AL_COMPLETE_IO; | |
b30ab791 | 2711 | drbd_al_complete_io(device, &peer_req->i); |
21ae5d7f | 2712 | } |
22cc37a9 | 2713 | |
b411b363 | 2714 | out_interrupted: |
7e5fec31 | 2715 | drbd_may_finish_epoch(connection, peer_req->epoch, EV_PUT | EV_CLEANUP); |
b30ab791 AG |
2716 | put_ldev(device); |
2717 | drbd_free_peer_req(device, peer_req); | |
82bc0194 | 2718 | return err; |
b411b363 PR |
2719 | } |
2720 | ||
0f0601f4 LE |
2721 | /* We may throttle resync, if the lower device seems to be busy, |
2722 | * and current sync rate is above c_min_rate. | |
2723 | * | |
2724 | * To decide whether or not the lower device is busy, we use a scheme similar | |
2725 | * to MD RAID is_mddev_idle(): if the partition stats reveal "significant" | |
2726 | * (more than 64 sectors) of activity we cannot account for with our own resync | |
2727 | * activity, it obviously is "busy". | |
2728 | * | |
2729 | * The current sync rate used here uses only the most recent two step marks, | |
2730 | * to have a short time average so we can react faster. | |
2731 | */ | |
ad3fee79 LE |
2732 | bool drbd_rs_should_slow_down(struct drbd_device *device, sector_t sector, |
2733 | bool throttle_if_app_is_waiting) | |
0f0601f4 | 2734 | { |
e3555d85 | 2735 | struct lc_element *tmp; |
ad3fee79 | 2736 | bool throttle = drbd_rs_c_min_rate_throttle(device); |
daeda1cc | 2737 | |
ad3fee79 LE |
2738 | if (!throttle || throttle_if_app_is_waiting) |
2739 | return throttle; | |
0f0601f4 | 2740 | |
b30ab791 AG |
2741 | spin_lock_irq(&device->al_lock); |
2742 | tmp = lc_find(device->resync, BM_SECT_TO_EXT(sector)); | |
e3555d85 PR |
2743 | if (tmp) { |
2744 | struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); | |
e8299874 LE |
2745 | if (test_bit(BME_PRIORITY, &bm_ext->flags)) |
2746 | throttle = false; | |
ad3fee79 LE |
2747 | /* Do not slow down if app IO is already waiting for this extent, |
2748 | * and our progress is necessary for application IO to complete. */ | |
e3555d85 | 2749 | } |
b30ab791 | 2750 | spin_unlock_irq(&device->al_lock); |
e3555d85 | 2751 | |
e8299874 LE |
2752 | return throttle; |
2753 | } | |
2754 | ||
2755 | bool drbd_rs_c_min_rate_throttle(struct drbd_device *device) | |
2756 | { | |
8c40c7c4 | 2757 | struct gendisk *disk = device->ldev->backing_bdev->bd_disk; |
e8299874 LE |
2758 | unsigned long db, dt, dbdt; |
2759 | unsigned int c_min_rate; | |
2760 | int curr_events; | |
2761 | ||
2762 | rcu_read_lock(); | |
2763 | c_min_rate = rcu_dereference(device->ldev->disk_conf)->c_min_rate; | |
2764 | rcu_read_unlock(); | |
2765 | ||
2766 | /* feature disabled? */ | |
2767 | if (c_min_rate == 0) | |
2768 | return false; | |
2769 | ||
8446fe92 | 2770 | curr_events = (int)part_stat_read_accum(disk->part0, sectors) - |
b30ab791 | 2771 | atomic_read(&device->rs_sect_ev); |
ad3fee79 LE |
2772 | |
2773 | if (atomic_read(&device->ap_actlog_cnt) | |
ff8bd88b | 2774 | || curr_events - device->rs_last_events > 64) { |
0f0601f4 LE |
2775 | unsigned long rs_left; |
2776 | int i; | |
2777 | ||
b30ab791 | 2778 | device->rs_last_events = curr_events; |
0f0601f4 LE |
2779 | |
2780 | /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, | |
2781 | * approx. */ | |
b30ab791 | 2782 | i = (device->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; |
2649f080 | 2783 | |
b30ab791 AG |
2784 | if (device->state.conn == C_VERIFY_S || device->state.conn == C_VERIFY_T) |
2785 | rs_left = device->ov_left; | |
2649f080 | 2786 | else |
b30ab791 | 2787 | rs_left = drbd_bm_total_weight(device) - device->rs_failed; |
0f0601f4 | 2788 | |
b30ab791 | 2789 | dt = ((long)jiffies - (long)device->rs_mark_time[i]) / HZ; |
0f0601f4 LE |
2790 | if (!dt) |
2791 | dt++; | |
b30ab791 | 2792 | db = device->rs_mark_left[i] - rs_left; |
0f0601f4 LE |
2793 | dbdt = Bit2KB(db/dt); |
2794 | ||
daeda1cc | 2795 | if (dbdt > c_min_rate) |
e8299874 | 2796 | return true; |
0f0601f4 | 2797 | } |
e8299874 | 2798 | return false; |
0f0601f4 LE |
2799 | } |
2800 | ||
bde89a9e | 2801 | static int receive_DataRequest(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 2802 | { |
9f4fe9ad | 2803 | struct drbd_peer_device *peer_device; |
b30ab791 | 2804 | struct drbd_device *device; |
b411b363 | 2805 | sector_t sector; |
4a76b161 | 2806 | sector_t capacity; |
db830c46 | 2807 | struct drbd_peer_request *peer_req; |
b411b363 | 2808 | struct digest_info *di = NULL; |
b18b37be | 2809 | int size, verb; |
e658983a | 2810 | struct p_block_req *p = pi->data; |
4a76b161 | 2811 | |
9f4fe9ad AG |
2812 | peer_device = conn_peer_device(connection, pi->vnr); |
2813 | if (!peer_device) | |
4a76b161 | 2814 | return -EIO; |
9f4fe9ad | 2815 | device = peer_device->device; |
155bd9d1 | 2816 | capacity = get_capacity(device->vdisk); |
b411b363 PR |
2817 | |
2818 | sector = be64_to_cpu(p->sector); | |
2819 | size = be32_to_cpu(p->blksize); | |
2820 | ||
c670a398 | 2821 | if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) { |
d0180171 | 2822 | drbd_err(device, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, |
b411b363 | 2823 | (unsigned long long)sector, size); |
82bc0194 | 2824 | return -EINVAL; |
b411b363 PR |
2825 | } |
2826 | if (sector + (size>>9) > capacity) { | |
d0180171 | 2827 | drbd_err(device, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, |
b411b363 | 2828 | (unsigned long long)sector, size); |
82bc0194 | 2829 | return -EINVAL; |
b411b363 PR |
2830 | } |
2831 | ||
b30ab791 | 2832 | if (!get_ldev_if_state(device, D_UP_TO_DATE)) { |
b18b37be | 2833 | verb = 1; |
e2857216 | 2834 | switch (pi->cmd) { |
b18b37be | 2835 | case P_DATA_REQUEST: |
69a22773 | 2836 | drbd_send_ack_rp(peer_device, P_NEG_DREPLY, p); |
b18b37be | 2837 | break; |
700ca8c0 | 2838 | case P_RS_THIN_REQ: |
b18b37be PR |
2839 | case P_RS_DATA_REQUEST: |
2840 | case P_CSUM_RS_REQUEST: | |
2841 | case P_OV_REQUEST: | |
69a22773 | 2842 | drbd_send_ack_rp(peer_device, P_NEG_RS_DREPLY , p); |
b18b37be PR |
2843 | break; |
2844 | case P_OV_REPLY: | |
2845 | verb = 0; | |
b30ab791 | 2846 | dec_rs_pending(device); |
69a22773 | 2847 | drbd_send_ack_ex(peer_device, P_OV_RESULT, sector, size, ID_IN_SYNC); |
b18b37be PR |
2848 | break; |
2849 | default: | |
49ba9b1b | 2850 | BUG(); |
b18b37be | 2851 | } |
e3fa02d7 | 2852 | if (verb && drbd_ratelimit()) |
d0180171 | 2853 | drbd_err(device, "Can not satisfy peer's read request, " |
b411b363 | 2854 | "no local data.\n"); |
b18b37be | 2855 | |
a821cc4a | 2856 | /* drain possibly payload */ |
69a22773 | 2857 | return drbd_drain_block(peer_device, pi->size); |
b411b363 PR |
2858 | } |
2859 | ||
2860 | /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD | |
2861 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
2862 | * which in turn might block on the other node at this very place. */ | |
a0fb3c47 | 2863 | peer_req = drbd_alloc_peer_req(peer_device, p->block_id, sector, size, |
9104d31a | 2864 | size, GFP_NOIO); |
db830c46 | 2865 | if (!peer_req) { |
b30ab791 | 2866 | put_ldev(device); |
82bc0194 | 2867 | return -ENOMEM; |
b411b363 | 2868 | } |
ce668b6d | 2869 | peer_req->opf = REQ_OP_READ; |
b411b363 | 2870 | |
e2857216 | 2871 | switch (pi->cmd) { |
b411b363 | 2872 | case P_DATA_REQUEST: |
a8cd15ba | 2873 | peer_req->w.cb = w_e_end_data_req; |
80a40e43 | 2874 | /* application IO, don't drbd_rs_begin_io */ |
21ae5d7f | 2875 | peer_req->flags |= EE_APPLICATION; |
80a40e43 LE |
2876 | goto submit; |
2877 | ||
700ca8c0 PR |
2878 | case P_RS_THIN_REQ: |
2879 | /* If at some point in the future we have a smart way to | |
2880 | find out if this data block is completely deallocated, | |
2881 | then we would do something smarter here than reading | |
2882 | the block... */ | |
2883 | peer_req->flags |= EE_RS_THIN_REQ; | |
df561f66 | 2884 | fallthrough; |
b411b363 | 2885 | case P_RS_DATA_REQUEST: |
a8cd15ba | 2886 | peer_req->w.cb = w_e_end_rsdata_req; |
5f9915bb | 2887 | /* used in the sector offset progress display */ |
b30ab791 | 2888 | device->bm_resync_fo = BM_SECT_TO_BIT(sector); |
b411b363 PR |
2889 | break; |
2890 | ||
2891 | case P_OV_REPLY: | |
2892 | case P_CSUM_RS_REQUEST: | |
e2857216 | 2893 | di = kmalloc(sizeof(*di) + pi->size, GFP_NOIO); |
b411b363 PR |
2894 | if (!di) |
2895 | goto out_free_e; | |
2896 | ||
e2857216 | 2897 | di->digest_size = pi->size; |
b411b363 PR |
2898 | di->digest = (((char *)di)+sizeof(struct digest_info)); |
2899 | ||
db830c46 AG |
2900 | peer_req->digest = di; |
2901 | peer_req->flags |= EE_HAS_DIGEST; | |
c36c3ced | 2902 | |
9f4fe9ad | 2903 | if (drbd_recv_all(peer_device->connection, di->digest, pi->size)) |
b411b363 PR |
2904 | goto out_free_e; |
2905 | ||
e2857216 | 2906 | if (pi->cmd == P_CSUM_RS_REQUEST) { |
9f4fe9ad | 2907 | D_ASSERT(device, peer_device->connection->agreed_pro_version >= 89); |
a8cd15ba | 2908 | peer_req->w.cb = w_e_end_csum_rs_req; |
5f9915bb | 2909 | /* used in the sector offset progress display */ |
b30ab791 | 2910 | device->bm_resync_fo = BM_SECT_TO_BIT(sector); |
aaaba345 LE |
2911 | /* remember to report stats in drbd_resync_finished */ |
2912 | device->use_csums = true; | |
e2857216 | 2913 | } else if (pi->cmd == P_OV_REPLY) { |
2649f080 | 2914 | /* track progress, we may need to throttle */ |
b30ab791 | 2915 | atomic_add(size >> 9, &device->rs_sect_in); |
a8cd15ba | 2916 | peer_req->w.cb = w_e_end_ov_reply; |
b30ab791 | 2917 | dec_rs_pending(device); |
0f0601f4 LE |
2918 | /* drbd_rs_begin_io done when we sent this request, |
2919 | * but accounting still needs to be done. */ | |
2920 | goto submit_for_resync; | |
b411b363 PR |
2921 | } |
2922 | break; | |
2923 | ||
2924 | case P_OV_REQUEST: | |
b30ab791 | 2925 | if (device->ov_start_sector == ~(sector_t)0 && |
9f4fe9ad | 2926 | peer_device->connection->agreed_pro_version >= 90) { |
de228bba LE |
2927 | unsigned long now = jiffies; |
2928 | int i; | |
b30ab791 AG |
2929 | device->ov_start_sector = sector; |
2930 | device->ov_position = sector; | |
2931 | device->ov_left = drbd_bm_bits(device) - BM_SECT_TO_BIT(sector); | |
2932 | device->rs_total = device->ov_left; | |
de228bba | 2933 | for (i = 0; i < DRBD_SYNC_MARKS; i++) { |
b30ab791 AG |
2934 | device->rs_mark_left[i] = device->ov_left; |
2935 | device->rs_mark_time[i] = now; | |
de228bba | 2936 | } |
d0180171 | 2937 | drbd_info(device, "Online Verify start sector: %llu\n", |
b411b363 PR |
2938 | (unsigned long long)sector); |
2939 | } | |
a8cd15ba | 2940 | peer_req->w.cb = w_e_end_ov_req; |
b411b363 PR |
2941 | break; |
2942 | ||
b411b363 | 2943 | default: |
49ba9b1b | 2944 | BUG(); |
b411b363 PR |
2945 | } |
2946 | ||
0f0601f4 LE |
2947 | /* Throttle, drbd_rs_begin_io and submit should become asynchronous |
2948 | * wrt the receiver, but it is not as straightforward as it may seem. | |
2949 | * Various places in the resync start and stop logic assume resync | |
2950 | * requests are processed in order, requeuing this on the worker thread | |
2951 | * introduces a bunch of new code for synchronization between threads. | |
2952 | * | |
2953 | * Unlimited throttling before drbd_rs_begin_io may stall the resync | |
2954 | * "forever", throttling after drbd_rs_begin_io will lock that extent | |
2955 | * for application writes for the same time. For now, just throttle | |
2956 | * here, where the rest of the code expects the receiver to sleep for | |
2957 | * a while, anyways. | |
2958 | */ | |
2959 | ||
2960 | /* Throttle before drbd_rs_begin_io, as that locks out application IO; | |
2961 | * this defers syncer requests for some time, before letting at least | |
2962 | * on request through. The resync controller on the receiving side | |
2963 | * will adapt to the incoming rate accordingly. | |
2964 | * | |
2965 | * We cannot throttle here if remote is Primary/SyncTarget: | |
2966 | * we would also throttle its application reads. | |
2967 | * In that case, throttling is done on the SyncTarget only. | |
2968 | */ | |
c5a2c150 LE |
2969 | |
2970 | /* Even though this may be a resync request, we do add to "read_ee"; | |
2971 | * "sync_ee" is only used for resync WRITEs. | |
2972 | * Add to list early, so debugfs can find this request | |
2973 | * even if we have to sleep below. */ | |
2974 | spin_lock_irq(&device->resource->req_lock); | |
2975 | list_add_tail(&peer_req->w.list, &device->read_ee); | |
2976 | spin_unlock_irq(&device->resource->req_lock); | |
2977 | ||
944410e9 | 2978 | update_receiver_timing_details(connection, drbd_rs_should_slow_down); |
ad3fee79 LE |
2979 | if (device->state.peer != R_PRIMARY |
2980 | && drbd_rs_should_slow_down(device, sector, false)) | |
e3555d85 | 2981 | schedule_timeout_uninterruptible(HZ/10); |
944410e9 | 2982 | update_receiver_timing_details(connection, drbd_rs_begin_io); |
b30ab791 | 2983 | if (drbd_rs_begin_io(device, sector)) |
80a40e43 | 2984 | goto out_free_e; |
b411b363 | 2985 | |
0f0601f4 | 2986 | submit_for_resync: |
b30ab791 | 2987 | atomic_add(size >> 9, &device->rs_sect_ev); |
0f0601f4 | 2988 | |
80a40e43 | 2989 | submit: |
944410e9 | 2990 | update_receiver_timing_details(connection, drbd_submit_peer_request); |
b30ab791 | 2991 | inc_unacked(device); |
ce668b6d | 2992 | if (drbd_submit_peer_request(peer_req) == 0) |
82bc0194 | 2993 | return 0; |
b411b363 | 2994 | |
10f6d992 | 2995 | /* don't care for the reason here */ |
d0180171 | 2996 | drbd_err(device, "submit failed, triggering re-connect\n"); |
c5a2c150 LE |
2997 | |
2998 | out_free_e: | |
0500813f | 2999 | spin_lock_irq(&device->resource->req_lock); |
a8cd15ba | 3000 | list_del(&peer_req->w.list); |
0500813f | 3001 | spin_unlock_irq(&device->resource->req_lock); |
22cc37a9 LE |
3002 | /* no drbd_rs_complete_io(), we are dropping the connection anyways */ |
3003 | ||
b30ab791 AG |
3004 | put_ldev(device); |
3005 | drbd_free_peer_req(device, peer_req); | |
82bc0194 | 3006 | return -EIO; |
b411b363 PR |
3007 | } |
3008 | ||
9b48ff07 | 3009 | /* |
69a22773 AG |
3010 | * drbd_asb_recover_0p - Recover after split-brain with no remaining primaries |
3011 | */ | |
3012 | static int drbd_asb_recover_0p(struct drbd_peer_device *peer_device) __must_hold(local) | |
b411b363 | 3013 | { |
69a22773 | 3014 | struct drbd_device *device = peer_device->device; |
b411b363 PR |
3015 | int self, peer, rv = -100; |
3016 | unsigned long ch_self, ch_peer; | |
44ed167d | 3017 | enum drbd_after_sb_p after_sb_0p; |
b411b363 | 3018 | |
b30ab791 AG |
3019 | self = device->ldev->md.uuid[UI_BITMAP] & 1; |
3020 | peer = device->p_uuid[UI_BITMAP] & 1; | |
b411b363 | 3021 | |
b30ab791 AG |
3022 | ch_peer = device->p_uuid[UI_SIZE]; |
3023 | ch_self = device->comm_bm_set; | |
b411b363 | 3024 | |
44ed167d | 3025 | rcu_read_lock(); |
69a22773 | 3026 | after_sb_0p = rcu_dereference(peer_device->connection->net_conf)->after_sb_0p; |
44ed167d PR |
3027 | rcu_read_unlock(); |
3028 | switch (after_sb_0p) { | |
b411b363 PR |
3029 | case ASB_CONSENSUS: |
3030 | case ASB_DISCARD_SECONDARY: | |
3031 | case ASB_CALL_HELPER: | |
44ed167d | 3032 | case ASB_VIOLENTLY: |
d0180171 | 3033 | drbd_err(device, "Configuration error.\n"); |
b411b363 PR |
3034 | break; |
3035 | case ASB_DISCONNECT: | |
3036 | break; | |
3037 | case ASB_DISCARD_YOUNGER_PRI: | |
3038 | if (self == 0 && peer == 1) { | |
3039 | rv = -1; | |
3040 | break; | |
3041 | } | |
3042 | if (self == 1 && peer == 0) { | |
3043 | rv = 1; | |
3044 | break; | |
3045 | } | |
df561f66 | 3046 | fallthrough; /* to one of the other strategies */ |
b411b363 PR |
3047 | case ASB_DISCARD_OLDER_PRI: |
3048 | if (self == 0 && peer == 1) { | |
3049 | rv = 1; | |
3050 | break; | |
3051 | } | |
3052 | if (self == 1 && peer == 0) { | |
3053 | rv = -1; | |
3054 | break; | |
3055 | } | |
3056 | /* Else fall through to one of the other strategies... */ | |
d0180171 | 3057 | drbd_warn(device, "Discard younger/older primary did not find a decision\n" |
b411b363 | 3058 | "Using discard-least-changes instead\n"); |
df561f66 | 3059 | fallthrough; |
b411b363 PR |
3060 | case ASB_DISCARD_ZERO_CHG: |
3061 | if (ch_peer == 0 && ch_self == 0) { | |
69a22773 | 3062 | rv = test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags) |
b411b363 PR |
3063 | ? -1 : 1; |
3064 | break; | |
3065 | } else { | |
3066 | if (ch_peer == 0) { rv = 1; break; } | |
3067 | if (ch_self == 0) { rv = -1; break; } | |
3068 | } | |
44ed167d | 3069 | if (after_sb_0p == ASB_DISCARD_ZERO_CHG) |
b411b363 | 3070 | break; |
df561f66 | 3071 | fallthrough; |
b411b363 PR |
3072 | case ASB_DISCARD_LEAST_CHG: |
3073 | if (ch_self < ch_peer) | |
3074 | rv = -1; | |
3075 | else if (ch_self > ch_peer) | |
3076 | rv = 1; | |
3077 | else /* ( ch_self == ch_peer ) */ | |
3078 | /* Well, then use something else. */ | |
69a22773 | 3079 | rv = test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags) |
b411b363 PR |
3080 | ? -1 : 1; |
3081 | break; | |
3082 | case ASB_DISCARD_LOCAL: | |
3083 | rv = -1; | |
3084 | break; | |
3085 | case ASB_DISCARD_REMOTE: | |
3086 | rv = 1; | |
3087 | } | |
3088 | ||
3089 | return rv; | |
3090 | } | |
3091 | ||
9b48ff07 | 3092 | /* |
69a22773 AG |
3093 | * drbd_asb_recover_1p - Recover after split-brain with one remaining primary |
3094 | */ | |
3095 | static int drbd_asb_recover_1p(struct drbd_peer_device *peer_device) __must_hold(local) | |
b411b363 | 3096 | { |
69a22773 | 3097 | struct drbd_device *device = peer_device->device; |
6184ea21 | 3098 | int hg, rv = -100; |
44ed167d | 3099 | enum drbd_after_sb_p after_sb_1p; |
b411b363 | 3100 | |
44ed167d | 3101 | rcu_read_lock(); |
69a22773 | 3102 | after_sb_1p = rcu_dereference(peer_device->connection->net_conf)->after_sb_1p; |
44ed167d PR |
3103 | rcu_read_unlock(); |
3104 | switch (after_sb_1p) { | |
b411b363 PR |
3105 | case ASB_DISCARD_YOUNGER_PRI: |
3106 | case ASB_DISCARD_OLDER_PRI: | |
3107 | case ASB_DISCARD_LEAST_CHG: | |
3108 | case ASB_DISCARD_LOCAL: | |
3109 | case ASB_DISCARD_REMOTE: | |
44ed167d | 3110 | case ASB_DISCARD_ZERO_CHG: |
d0180171 | 3111 | drbd_err(device, "Configuration error.\n"); |
b411b363 PR |
3112 | break; |
3113 | case ASB_DISCONNECT: | |
3114 | break; | |
3115 | case ASB_CONSENSUS: | |
69a22773 | 3116 | hg = drbd_asb_recover_0p(peer_device); |
b30ab791 | 3117 | if (hg == -1 && device->state.role == R_SECONDARY) |
b411b363 | 3118 | rv = hg; |
b30ab791 | 3119 | if (hg == 1 && device->state.role == R_PRIMARY) |
b411b363 PR |
3120 | rv = hg; |
3121 | break; | |
3122 | case ASB_VIOLENTLY: | |
69a22773 | 3123 | rv = drbd_asb_recover_0p(peer_device); |
b411b363 PR |
3124 | break; |
3125 | case ASB_DISCARD_SECONDARY: | |
b30ab791 | 3126 | return device->state.role == R_PRIMARY ? 1 : -1; |
b411b363 | 3127 | case ASB_CALL_HELPER: |
69a22773 | 3128 | hg = drbd_asb_recover_0p(peer_device); |
b30ab791 | 3129 | if (hg == -1 && device->state.role == R_PRIMARY) { |
bb437946 AG |
3130 | enum drbd_state_rv rv2; |
3131 | ||
b411b363 PR |
3132 | /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, |
3133 | * we might be here in C_WF_REPORT_PARAMS which is transient. | |
3134 | * we do not need to wait for the after state change work either. */ | |
b30ab791 | 3135 | rv2 = drbd_change_state(device, CS_VERBOSE, NS(role, R_SECONDARY)); |
bb437946 | 3136 | if (rv2 != SS_SUCCESS) { |
b30ab791 | 3137 | drbd_khelper(device, "pri-lost-after-sb"); |
b411b363 | 3138 | } else { |
d0180171 | 3139 | drbd_warn(device, "Successfully gave up primary role.\n"); |
b411b363 PR |
3140 | rv = hg; |
3141 | } | |
3142 | } else | |
3143 | rv = hg; | |
3144 | } | |
3145 | ||
3146 | return rv; | |
3147 | } | |
3148 | ||
9b48ff07 | 3149 | /* |
69a22773 AG |
3150 | * drbd_asb_recover_2p - Recover after split-brain with two remaining primaries |
3151 | */ | |
3152 | static int drbd_asb_recover_2p(struct drbd_peer_device *peer_device) __must_hold(local) | |
b411b363 | 3153 | { |
69a22773 | 3154 | struct drbd_device *device = peer_device->device; |
6184ea21 | 3155 | int hg, rv = -100; |
44ed167d | 3156 | enum drbd_after_sb_p after_sb_2p; |
b411b363 | 3157 | |
44ed167d | 3158 | rcu_read_lock(); |
69a22773 | 3159 | after_sb_2p = rcu_dereference(peer_device->connection->net_conf)->after_sb_2p; |
44ed167d PR |
3160 | rcu_read_unlock(); |
3161 | switch (after_sb_2p) { | |
b411b363 PR |
3162 | case ASB_DISCARD_YOUNGER_PRI: |
3163 | case ASB_DISCARD_OLDER_PRI: | |
3164 | case ASB_DISCARD_LEAST_CHG: | |
3165 | case ASB_DISCARD_LOCAL: | |
3166 | case ASB_DISCARD_REMOTE: | |
3167 | case ASB_CONSENSUS: | |
3168 | case ASB_DISCARD_SECONDARY: | |
44ed167d | 3169 | case ASB_DISCARD_ZERO_CHG: |
d0180171 | 3170 | drbd_err(device, "Configuration error.\n"); |
b411b363 PR |
3171 | break; |
3172 | case ASB_VIOLENTLY: | |
69a22773 | 3173 | rv = drbd_asb_recover_0p(peer_device); |
b411b363 PR |
3174 | break; |
3175 | case ASB_DISCONNECT: | |
3176 | break; | |
3177 | case ASB_CALL_HELPER: | |
69a22773 | 3178 | hg = drbd_asb_recover_0p(peer_device); |
b411b363 | 3179 | if (hg == -1) { |
bb437946 AG |
3180 | enum drbd_state_rv rv2; |
3181 | ||
b411b363 PR |
3182 | /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, |
3183 | * we might be here in C_WF_REPORT_PARAMS which is transient. | |
3184 | * we do not need to wait for the after state change work either. */ | |
b30ab791 | 3185 | rv2 = drbd_change_state(device, CS_VERBOSE, NS(role, R_SECONDARY)); |
bb437946 | 3186 | if (rv2 != SS_SUCCESS) { |
b30ab791 | 3187 | drbd_khelper(device, "pri-lost-after-sb"); |
b411b363 | 3188 | } else { |
d0180171 | 3189 | drbd_warn(device, "Successfully gave up primary role.\n"); |
b411b363 PR |
3190 | rv = hg; |
3191 | } | |
3192 | } else | |
3193 | rv = hg; | |
3194 | } | |
3195 | ||
3196 | return rv; | |
3197 | } | |
3198 | ||
b30ab791 | 3199 | static void drbd_uuid_dump(struct drbd_device *device, char *text, u64 *uuid, |
b411b363 PR |
3200 | u64 bits, u64 flags) |
3201 | { | |
3202 | if (!uuid) { | |
d0180171 | 3203 | drbd_info(device, "%s uuid info vanished while I was looking!\n", text); |
b411b363 PR |
3204 | return; |
3205 | } | |
d0180171 | 3206 | drbd_info(device, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", |
b411b363 PR |
3207 | text, |
3208 | (unsigned long long)uuid[UI_CURRENT], | |
3209 | (unsigned long long)uuid[UI_BITMAP], | |
3210 | (unsigned long long)uuid[UI_HISTORY_START], | |
3211 | (unsigned long long)uuid[UI_HISTORY_END], | |
3212 | (unsigned long long)bits, | |
3213 | (unsigned long long)flags); | |
3214 | } | |
3215 | ||
3216 | /* | |
3217 | 100 after split brain try auto recover | |
3218 | 2 C_SYNC_SOURCE set BitMap | |
3219 | 1 C_SYNC_SOURCE use BitMap | |
3220 | 0 no Sync | |
3221 | -1 C_SYNC_TARGET use BitMap | |
3222 | -2 C_SYNC_TARGET set BitMap | |
3223 | -100 after split brain, disconnect | |
3224 | -1000 unrelated data | |
4a23f264 PR |
3225 | -1091 requires proto 91 |
3226 | -1096 requires proto 96 | |
b411b363 | 3227 | */ |
f2d3d75b LE |
3228 | |
3229 | static int drbd_uuid_compare(struct drbd_device *const device, enum drbd_role const peer_role, int *rule_nr) __must_hold(local) | |
b411b363 | 3230 | { |
44a4d551 LE |
3231 | struct drbd_peer_device *const peer_device = first_peer_device(device); |
3232 | struct drbd_connection *const connection = peer_device ? peer_device->connection : NULL; | |
b411b363 PR |
3233 | u64 self, peer; |
3234 | int i, j; | |
3235 | ||
b30ab791 AG |
3236 | self = device->ldev->md.uuid[UI_CURRENT] & ~((u64)1); |
3237 | peer = device->p_uuid[UI_CURRENT] & ~((u64)1); | |
b411b363 PR |
3238 | |
3239 | *rule_nr = 10; | |
3240 | if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) | |
3241 | return 0; | |
3242 | ||
3243 | *rule_nr = 20; | |
3244 | if ((self == UUID_JUST_CREATED || self == (u64)0) && | |
3245 | peer != UUID_JUST_CREATED) | |
3246 | return -2; | |
3247 | ||
3248 | *rule_nr = 30; | |
3249 | if (self != UUID_JUST_CREATED && | |
3250 | (peer == UUID_JUST_CREATED || peer == (u64)0)) | |
3251 | return 2; | |
3252 | ||
3253 | if (self == peer) { | |
3254 | int rct, dc; /* roles at crash time */ | |
3255 | ||
b30ab791 | 3256 | if (device->p_uuid[UI_BITMAP] == (u64)0 && device->ldev->md.uuid[UI_BITMAP] != (u64)0) { |
b411b363 | 3257 | |
44a4d551 | 3258 | if (connection->agreed_pro_version < 91) |
4a23f264 | 3259 | return -1091; |
b411b363 | 3260 | |
b30ab791 AG |
3261 | if ((device->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (device->p_uuid[UI_HISTORY_START] & ~((u64)1)) && |
3262 | (device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (device->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { | |
d0180171 | 3263 | drbd_info(device, "was SyncSource, missed the resync finished event, corrected myself:\n"); |
b30ab791 AG |
3264 | drbd_uuid_move_history(device); |
3265 | device->ldev->md.uuid[UI_HISTORY_START] = device->ldev->md.uuid[UI_BITMAP]; | |
3266 | device->ldev->md.uuid[UI_BITMAP] = 0; | |
b411b363 | 3267 | |
b30ab791 AG |
3268 | drbd_uuid_dump(device, "self", device->ldev->md.uuid, |
3269 | device->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(device) : 0, 0); | |
b411b363 PR |
3270 | *rule_nr = 34; |
3271 | } else { | |
d0180171 | 3272 | drbd_info(device, "was SyncSource (peer failed to write sync_uuid)\n"); |
b411b363 PR |
3273 | *rule_nr = 36; |
3274 | } | |
3275 | ||
3276 | return 1; | |
3277 | } | |
3278 | ||
b30ab791 | 3279 | if (device->ldev->md.uuid[UI_BITMAP] == (u64)0 && device->p_uuid[UI_BITMAP] != (u64)0) { |
b411b363 | 3280 | |
44a4d551 | 3281 | if (connection->agreed_pro_version < 91) |
4a23f264 | 3282 | return -1091; |
b411b363 | 3283 | |
b30ab791 AG |
3284 | if ((device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (device->p_uuid[UI_BITMAP] & ~((u64)1)) && |
3285 | (device->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (device->p_uuid[UI_HISTORY_START] & ~((u64)1))) { | |
d0180171 | 3286 | drbd_info(device, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); |
b411b363 | 3287 | |
b30ab791 AG |
3288 | device->p_uuid[UI_HISTORY_START + 1] = device->p_uuid[UI_HISTORY_START]; |
3289 | device->p_uuid[UI_HISTORY_START] = device->p_uuid[UI_BITMAP]; | |
3290 | device->p_uuid[UI_BITMAP] = 0UL; | |
b411b363 | 3291 | |
b30ab791 | 3292 | drbd_uuid_dump(device, "peer", device->p_uuid, device->p_uuid[UI_SIZE], device->p_uuid[UI_FLAGS]); |
b411b363 PR |
3293 | *rule_nr = 35; |
3294 | } else { | |
d0180171 | 3295 | drbd_info(device, "was SyncTarget (failed to write sync_uuid)\n"); |
b411b363 PR |
3296 | *rule_nr = 37; |
3297 | } | |
3298 | ||
3299 | return -1; | |
3300 | } | |
3301 | ||
3302 | /* Common power [off|failure] */ | |
b30ab791 AG |
3303 | rct = (test_bit(CRASHED_PRIMARY, &device->flags) ? 1 : 0) + |
3304 | (device->p_uuid[UI_FLAGS] & 2); | |
b411b363 PR |
3305 | /* lowest bit is set when we were primary, |
3306 | * next bit (weight 2) is set when peer was primary */ | |
3307 | *rule_nr = 40; | |
3308 | ||
f2d3d75b LE |
3309 | /* Neither has the "crashed primary" flag set, |
3310 | * only a replication link hickup. */ | |
3311 | if (rct == 0) | |
3312 | return 0; | |
3313 | ||
3314 | /* Current UUID equal and no bitmap uuid; does not necessarily | |
3315 | * mean this was a "simultaneous hard crash", maybe IO was | |
3316 | * frozen, so no UUID-bump happened. | |
3317 | * This is a protocol change, overload DRBD_FF_WSAME as flag | |
3318 | * for "new-enough" peer DRBD version. */ | |
3319 | if (device->state.role == R_PRIMARY || peer_role == R_PRIMARY) { | |
3320 | *rule_nr = 41; | |
3321 | if (!(connection->agreed_features & DRBD_FF_WSAME)) { | |
3322 | drbd_warn(peer_device, "Equivalent unrotated UUIDs, but current primary present.\n"); | |
3323 | return -(0x10000 | PRO_VERSION_MAX | (DRBD_FF_WSAME << 8)); | |
3324 | } | |
3325 | if (device->state.role == R_PRIMARY && peer_role == R_PRIMARY) { | |
3326 | /* At least one has the "crashed primary" bit set, | |
3327 | * both are primary now, but neither has rotated its UUIDs? | |
3328 | * "Can not happen." */ | |
3329 | drbd_err(peer_device, "Equivalent unrotated UUIDs, but both are primary. Can not resolve this.\n"); | |
3330 | return -100; | |
3331 | } | |
3332 | if (device->state.role == R_PRIMARY) | |
3333 | return 1; | |
3334 | return -1; | |
3335 | } | |
3336 | ||
3337 | /* Both are secondary. | |
3338 | * Really looks like recovery from simultaneous hard crash. | |
3339 | * Check which had been primary before, and arbitrate. */ | |
b411b363 | 3340 | switch (rct) { |
f2d3d75b | 3341 | case 0: /* !self_pri && !peer_pri */ return 0; /* already handled */ |
b411b363 PR |
3342 | case 1: /* self_pri && !peer_pri */ return 1; |
3343 | case 2: /* !self_pri && peer_pri */ return -1; | |
3344 | case 3: /* self_pri && peer_pri */ | |
44a4d551 | 3345 | dc = test_bit(RESOLVE_CONFLICTS, &connection->flags); |
b411b363 PR |
3346 | return dc ? -1 : 1; |
3347 | } | |
3348 | } | |
3349 | ||
3350 | *rule_nr = 50; | |
b30ab791 | 3351 | peer = device->p_uuid[UI_BITMAP] & ~((u64)1); |
b411b363 PR |
3352 | if (self == peer) |
3353 | return -1; | |
3354 | ||
3355 | *rule_nr = 51; | |
b30ab791 | 3356 | peer = device->p_uuid[UI_HISTORY_START] & ~((u64)1); |
b411b363 | 3357 | if (self == peer) { |
44a4d551 | 3358 | if (connection->agreed_pro_version < 96 ? |
b30ab791 AG |
3359 | (device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == |
3360 | (device->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) : | |
3361 | peer + UUID_NEW_BM_OFFSET == (device->p_uuid[UI_BITMAP] & ~((u64)1))) { | |
b411b363 PR |
3362 | /* The last P_SYNC_UUID did not get though. Undo the last start of |
3363 | resync as sync source modifications of the peer's UUIDs. */ | |
3364 | ||
44a4d551 | 3365 | if (connection->agreed_pro_version < 91) |
4a23f264 | 3366 | return -1091; |
b411b363 | 3367 | |
b30ab791 AG |
3368 | device->p_uuid[UI_BITMAP] = device->p_uuid[UI_HISTORY_START]; |
3369 | device->p_uuid[UI_HISTORY_START] = device->p_uuid[UI_HISTORY_START + 1]; | |
4a23f264 | 3370 | |
d0180171 | 3371 | drbd_info(device, "Lost last syncUUID packet, corrected:\n"); |
b30ab791 | 3372 | drbd_uuid_dump(device, "peer", device->p_uuid, device->p_uuid[UI_SIZE], device->p_uuid[UI_FLAGS]); |
4a23f264 | 3373 | |
b411b363 PR |
3374 | return -1; |
3375 | } | |
3376 | } | |
3377 | ||
3378 | *rule_nr = 60; | |
b30ab791 | 3379 | self = device->ldev->md.uuid[UI_CURRENT] & ~((u64)1); |
b411b363 | 3380 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { |
b30ab791 | 3381 | peer = device->p_uuid[i] & ~((u64)1); |
b411b363 PR |
3382 | if (self == peer) |
3383 | return -2; | |
3384 | } | |
3385 | ||
3386 | *rule_nr = 70; | |
b30ab791 AG |
3387 | self = device->ldev->md.uuid[UI_BITMAP] & ~((u64)1); |
3388 | peer = device->p_uuid[UI_CURRENT] & ~((u64)1); | |
b411b363 PR |
3389 | if (self == peer) |
3390 | return 1; | |
3391 | ||
3392 | *rule_nr = 71; | |
b30ab791 | 3393 | self = device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); |
b411b363 | 3394 | if (self == peer) { |
44a4d551 | 3395 | if (connection->agreed_pro_version < 96 ? |
b30ab791 AG |
3396 | (device->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == |
3397 | (device->p_uuid[UI_HISTORY_START] & ~((u64)1)) : | |
3398 | self + UUID_NEW_BM_OFFSET == (device->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) { | |
b411b363 PR |
3399 | /* The last P_SYNC_UUID did not get though. Undo the last start of |
3400 | resync as sync source modifications of our UUIDs. */ | |
3401 | ||
44a4d551 | 3402 | if (connection->agreed_pro_version < 91) |
4a23f264 | 3403 | return -1091; |
b411b363 | 3404 | |
b30ab791 AG |
3405 | __drbd_uuid_set(device, UI_BITMAP, device->ldev->md.uuid[UI_HISTORY_START]); |
3406 | __drbd_uuid_set(device, UI_HISTORY_START, device->ldev->md.uuid[UI_HISTORY_START + 1]); | |
b411b363 | 3407 | |
d0180171 | 3408 | drbd_info(device, "Last syncUUID did not get through, corrected:\n"); |
b30ab791 AG |
3409 | drbd_uuid_dump(device, "self", device->ldev->md.uuid, |
3410 | device->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(device) : 0, 0); | |
b411b363 PR |
3411 | |
3412 | return 1; | |
3413 | } | |
3414 | } | |
3415 | ||
3416 | ||
3417 | *rule_nr = 80; | |
b30ab791 | 3418 | peer = device->p_uuid[UI_CURRENT] & ~((u64)1); |
b411b363 | 3419 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { |
b30ab791 | 3420 | self = device->ldev->md.uuid[i] & ~((u64)1); |
b411b363 PR |
3421 | if (self == peer) |
3422 | return 2; | |
3423 | } | |
3424 | ||
3425 | *rule_nr = 90; | |
b30ab791 AG |
3426 | self = device->ldev->md.uuid[UI_BITMAP] & ~((u64)1); |
3427 | peer = device->p_uuid[UI_BITMAP] & ~((u64)1); | |
b411b363 PR |
3428 | if (self == peer && self != ((u64)0)) |
3429 | return 100; | |
3430 | ||
3431 | *rule_nr = 100; | |
3432 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { | |
b30ab791 | 3433 | self = device->ldev->md.uuid[i] & ~((u64)1); |
b411b363 | 3434 | for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { |
b30ab791 | 3435 | peer = device->p_uuid[j] & ~((u64)1); |
b411b363 PR |
3436 | if (self == peer) |
3437 | return -100; | |
3438 | } | |
3439 | } | |
3440 | ||
3441 | return -1000; | |
3442 | } | |
3443 | ||
3444 | /* drbd_sync_handshake() returns the new conn state on success, or | |
3445 | CONN_MASK (-1) on failure. | |
3446 | */ | |
69a22773 AG |
3447 | static enum drbd_conns drbd_sync_handshake(struct drbd_peer_device *peer_device, |
3448 | enum drbd_role peer_role, | |
b411b363 PR |
3449 | enum drbd_disk_state peer_disk) __must_hold(local) |
3450 | { | |
69a22773 | 3451 | struct drbd_device *device = peer_device->device; |
b411b363 PR |
3452 | enum drbd_conns rv = C_MASK; |
3453 | enum drbd_disk_state mydisk; | |
44ed167d | 3454 | struct net_conf *nc; |
d29e89e3 | 3455 | int hg, rule_nr, rr_conflict, tentative, always_asbp; |
b411b363 | 3456 | |
b30ab791 | 3457 | mydisk = device->state.disk; |
b411b363 | 3458 | if (mydisk == D_NEGOTIATING) |
b30ab791 | 3459 | mydisk = device->new_state_tmp.disk; |
b411b363 | 3460 | |
d0180171 | 3461 | drbd_info(device, "drbd_sync_handshake:\n"); |
9f2247bb | 3462 | |
b30ab791 AG |
3463 | spin_lock_irq(&device->ldev->md.uuid_lock); |
3464 | drbd_uuid_dump(device, "self", device->ldev->md.uuid, device->comm_bm_set, 0); | |
3465 | drbd_uuid_dump(device, "peer", device->p_uuid, | |
3466 | device->p_uuid[UI_SIZE], device->p_uuid[UI_FLAGS]); | |
b411b363 | 3467 | |
f2d3d75b | 3468 | hg = drbd_uuid_compare(device, peer_role, &rule_nr); |
b30ab791 | 3469 | spin_unlock_irq(&device->ldev->md.uuid_lock); |
b411b363 | 3470 | |
d0180171 | 3471 | drbd_info(device, "uuid_compare()=%d by rule %d\n", hg, rule_nr); |
b411b363 PR |
3472 | |
3473 | if (hg == -1000) { | |
d0180171 | 3474 | drbd_alert(device, "Unrelated data, aborting!\n"); |
b411b363 PR |
3475 | return C_MASK; |
3476 | } | |
f2d3d75b LE |
3477 | if (hg < -0x10000) { |
3478 | int proto, fflags; | |
3479 | hg = -hg; | |
3480 | proto = hg & 0xff; | |
3481 | fflags = (hg >> 8) & 0xff; | |
3482 | drbd_alert(device, "To resolve this both sides have to support at least protocol %d and feature flags 0x%x\n", | |
3483 | proto, fflags); | |
3484 | return C_MASK; | |
3485 | } | |
4a23f264 | 3486 | if (hg < -1000) { |
d0180171 | 3487 | drbd_alert(device, "To resolve this both sides have to support at least protocol %d\n", -hg - 1000); |
b411b363 PR |
3488 | return C_MASK; |
3489 | } | |
3490 | ||
3491 | if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || | |
3492 | (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { | |
3493 | int f = (hg == -100) || abs(hg) == 2; | |
3494 | hg = mydisk > D_INCONSISTENT ? 1 : -1; | |
3495 | if (f) | |
3496 | hg = hg*2; | |
d0180171 | 3497 | drbd_info(device, "Becoming sync %s due to disk states.\n", |
b411b363 PR |
3498 | hg > 0 ? "source" : "target"); |
3499 | } | |
3500 | ||
3a11a487 | 3501 | if (abs(hg) == 100) |
b30ab791 | 3502 | drbd_khelper(device, "initial-split-brain"); |
3a11a487 | 3503 | |
44ed167d | 3504 | rcu_read_lock(); |
69a22773 | 3505 | nc = rcu_dereference(peer_device->connection->net_conf); |
d29e89e3 RK |
3506 | always_asbp = nc->always_asbp; |
3507 | rr_conflict = nc->rr_conflict; | |
3508 | tentative = nc->tentative; | |
3509 | rcu_read_unlock(); | |
44ed167d | 3510 | |
d29e89e3 | 3511 | if (hg == 100 || (hg == -100 && always_asbp)) { |
b30ab791 | 3512 | int pcount = (device->state.role == R_PRIMARY) |
b411b363 PR |
3513 | + (peer_role == R_PRIMARY); |
3514 | int forced = (hg == -100); | |
3515 | ||
3516 | switch (pcount) { | |
3517 | case 0: | |
69a22773 | 3518 | hg = drbd_asb_recover_0p(peer_device); |
b411b363 PR |
3519 | break; |
3520 | case 1: | |
69a22773 | 3521 | hg = drbd_asb_recover_1p(peer_device); |
b411b363 PR |
3522 | break; |
3523 | case 2: | |
69a22773 | 3524 | hg = drbd_asb_recover_2p(peer_device); |
b411b363 PR |
3525 | break; |
3526 | } | |
3527 | if (abs(hg) < 100) { | |
d0180171 | 3528 | drbd_warn(device, "Split-Brain detected, %d primaries, " |
b411b363 PR |
3529 | "automatically solved. Sync from %s node\n", |
3530 | pcount, (hg < 0) ? "peer" : "this"); | |
3531 | if (forced) { | |
d0180171 | 3532 | drbd_warn(device, "Doing a full sync, since" |
b411b363 PR |
3533 | " UUIDs where ambiguous.\n"); |
3534 | hg = hg*2; | |
3535 | } | |
3536 | } | |
3537 | } | |
3538 | ||
3539 | if (hg == -100) { | |
b30ab791 | 3540 | if (test_bit(DISCARD_MY_DATA, &device->flags) && !(device->p_uuid[UI_FLAGS]&1)) |
b411b363 | 3541 | hg = -1; |
b30ab791 | 3542 | if (!test_bit(DISCARD_MY_DATA, &device->flags) && (device->p_uuid[UI_FLAGS]&1)) |
b411b363 PR |
3543 | hg = 1; |
3544 | ||
3545 | if (abs(hg) < 100) | |
d0180171 | 3546 | drbd_warn(device, "Split-Brain detected, manually solved. " |
b411b363 PR |
3547 | "Sync from %s node\n", |
3548 | (hg < 0) ? "peer" : "this"); | |
3549 | } | |
3550 | ||
3551 | if (hg == -100) { | |
580b9767 LE |
3552 | /* FIXME this log message is not correct if we end up here |
3553 | * after an attempted attach on a diskless node. | |
3554 | * We just refuse to attach -- well, we drop the "connection" | |
3555 | * to that disk, in a way... */ | |
d0180171 | 3556 | drbd_alert(device, "Split-Brain detected but unresolved, dropping connection!\n"); |
b30ab791 | 3557 | drbd_khelper(device, "split-brain"); |
b411b363 PR |
3558 | return C_MASK; |
3559 | } | |
3560 | ||
3561 | if (hg > 0 && mydisk <= D_INCONSISTENT) { | |
d0180171 | 3562 | drbd_err(device, "I shall become SyncSource, but I am inconsistent!\n"); |
b411b363 PR |
3563 | return C_MASK; |
3564 | } | |
3565 | ||
3566 | if (hg < 0 && /* by intention we do not use mydisk here. */ | |
b30ab791 | 3567 | device->state.role == R_PRIMARY && device->state.disk >= D_CONSISTENT) { |
44ed167d | 3568 | switch (rr_conflict) { |
b411b363 | 3569 | case ASB_CALL_HELPER: |
b30ab791 | 3570 | drbd_khelper(device, "pri-lost"); |
df561f66 | 3571 | fallthrough; |
b411b363 | 3572 | case ASB_DISCONNECT: |
d0180171 | 3573 | drbd_err(device, "I shall become SyncTarget, but I am primary!\n"); |
b411b363 PR |
3574 | return C_MASK; |
3575 | case ASB_VIOLENTLY: | |
d0180171 | 3576 | drbd_warn(device, "Becoming SyncTarget, violating the stable-data" |
b411b363 PR |
3577 | "assumption\n"); |
3578 | } | |
3579 | } | |
3580 | ||
69a22773 | 3581 | if (tentative || test_bit(CONN_DRY_RUN, &peer_device->connection->flags)) { |
cf14c2e9 | 3582 | if (hg == 0) |
d0180171 | 3583 | drbd_info(device, "dry-run connect: No resync, would become Connected immediately.\n"); |
cf14c2e9 | 3584 | else |
d0180171 | 3585 | drbd_info(device, "dry-run connect: Would become %s, doing a %s resync.", |
cf14c2e9 PR |
3586 | drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), |
3587 | abs(hg) >= 2 ? "full" : "bit-map based"); | |
3588 | return C_MASK; | |
3589 | } | |
3590 | ||
b411b363 | 3591 | if (abs(hg) >= 2) { |
d0180171 | 3592 | drbd_info(device, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); |
b30ab791 | 3593 | if (drbd_bitmap_io(device, &drbd_bmio_set_n_write, "set_n_write from sync_handshake", |
20ceb2b2 | 3594 | BM_LOCKED_SET_ALLOWED)) |
b411b363 PR |
3595 | return C_MASK; |
3596 | } | |
3597 | ||
3598 | if (hg > 0) { /* become sync source. */ | |
3599 | rv = C_WF_BITMAP_S; | |
3600 | } else if (hg < 0) { /* become sync target */ | |
3601 | rv = C_WF_BITMAP_T; | |
3602 | } else { | |
3603 | rv = C_CONNECTED; | |
b30ab791 | 3604 | if (drbd_bm_total_weight(device)) { |
d0180171 | 3605 | drbd_info(device, "No resync, but %lu bits in bitmap!\n", |
b30ab791 | 3606 | drbd_bm_total_weight(device)); |
b411b363 PR |
3607 | } |
3608 | } | |
3609 | ||
3610 | return rv; | |
3611 | } | |
3612 | ||
f179d76d | 3613 | static enum drbd_after_sb_p convert_after_sb(enum drbd_after_sb_p peer) |
b411b363 PR |
3614 | { |
3615 | /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ | |
f179d76d PR |
3616 | if (peer == ASB_DISCARD_REMOTE) |
3617 | return ASB_DISCARD_LOCAL; | |
b411b363 PR |
3618 | |
3619 | /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ | |
f179d76d PR |
3620 | if (peer == ASB_DISCARD_LOCAL) |
3621 | return ASB_DISCARD_REMOTE; | |
b411b363 PR |
3622 | |
3623 | /* everything else is valid if they are equal on both sides. */ | |
f179d76d | 3624 | return peer; |
b411b363 PR |
3625 | } |
3626 | ||
bde89a9e | 3627 | static int receive_protocol(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 3628 | { |
e658983a | 3629 | struct p_protocol *p = pi->data; |
036b17ea PR |
3630 | enum drbd_after_sb_p p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; |
3631 | int p_proto, p_discard_my_data, p_two_primaries, cf; | |
3632 | struct net_conf *nc, *old_net_conf, *new_net_conf = NULL; | |
3633 | char integrity_alg[SHARED_SECRET_MAX] = ""; | |
3d0e6375 | 3634 | struct crypto_shash *peer_integrity_tfm = NULL; |
7aca6c75 | 3635 | void *int_dig_in = NULL, *int_dig_vv = NULL; |
b411b363 | 3636 | |
b411b363 PR |
3637 | p_proto = be32_to_cpu(p->protocol); |
3638 | p_after_sb_0p = be32_to_cpu(p->after_sb_0p); | |
3639 | p_after_sb_1p = be32_to_cpu(p->after_sb_1p); | |
3640 | p_after_sb_2p = be32_to_cpu(p->after_sb_2p); | |
b411b363 | 3641 | p_two_primaries = be32_to_cpu(p->two_primaries); |
cf14c2e9 | 3642 | cf = be32_to_cpu(p->conn_flags); |
6139f60d | 3643 | p_discard_my_data = cf & CF_DISCARD_MY_DATA; |
cf14c2e9 | 3644 | |
bde89a9e | 3645 | if (connection->agreed_pro_version >= 87) { |
86db0618 | 3646 | int err; |
cf14c2e9 | 3647 | |
88104ca4 | 3648 | if (pi->size > sizeof(integrity_alg)) |
86db0618 | 3649 | return -EIO; |
bde89a9e | 3650 | err = drbd_recv_all(connection, integrity_alg, pi->size); |
86db0618 AG |
3651 | if (err) |
3652 | return err; | |
036b17ea | 3653 | integrity_alg[SHARED_SECRET_MAX - 1] = 0; |
b411b363 PR |
3654 | } |
3655 | ||
7d4c782c | 3656 | if (pi->cmd != P_PROTOCOL_UPDATE) { |
bde89a9e | 3657 | clear_bit(CONN_DRY_RUN, &connection->flags); |
b411b363 | 3658 | |
fbc12f45 | 3659 | if (cf & CF_DRY_RUN) |
bde89a9e | 3660 | set_bit(CONN_DRY_RUN, &connection->flags); |
b411b363 | 3661 | |
fbc12f45 | 3662 | rcu_read_lock(); |
bde89a9e | 3663 | nc = rcu_dereference(connection->net_conf); |
b411b363 | 3664 | |
fbc12f45 | 3665 | if (p_proto != nc->wire_protocol) { |
1ec861eb | 3666 | drbd_err(connection, "incompatible %s settings\n", "protocol"); |
fbc12f45 AG |
3667 | goto disconnect_rcu_unlock; |
3668 | } | |
b411b363 | 3669 | |
fbc12f45 | 3670 | if (convert_after_sb(p_after_sb_0p) != nc->after_sb_0p) { |
1ec861eb | 3671 | drbd_err(connection, "incompatible %s settings\n", "after-sb-0pri"); |
fbc12f45 AG |
3672 | goto disconnect_rcu_unlock; |
3673 | } | |
b411b363 | 3674 | |
fbc12f45 | 3675 | if (convert_after_sb(p_after_sb_1p) != nc->after_sb_1p) { |
1ec861eb | 3676 | drbd_err(connection, "incompatible %s settings\n", "after-sb-1pri"); |
fbc12f45 AG |
3677 | goto disconnect_rcu_unlock; |
3678 | } | |
b411b363 | 3679 | |
fbc12f45 | 3680 | if (convert_after_sb(p_after_sb_2p) != nc->after_sb_2p) { |
1ec861eb | 3681 | drbd_err(connection, "incompatible %s settings\n", "after-sb-2pri"); |
fbc12f45 AG |
3682 | goto disconnect_rcu_unlock; |
3683 | } | |
b411b363 | 3684 | |
fbc12f45 | 3685 | if (p_discard_my_data && nc->discard_my_data) { |
1ec861eb | 3686 | drbd_err(connection, "incompatible %s settings\n", "discard-my-data"); |
fbc12f45 AG |
3687 | goto disconnect_rcu_unlock; |
3688 | } | |
b411b363 | 3689 | |
fbc12f45 | 3690 | if (p_two_primaries != nc->two_primaries) { |
1ec861eb | 3691 | drbd_err(connection, "incompatible %s settings\n", "allow-two-primaries"); |
fbc12f45 AG |
3692 | goto disconnect_rcu_unlock; |
3693 | } | |
b411b363 | 3694 | |
fbc12f45 | 3695 | if (strcmp(integrity_alg, nc->integrity_alg)) { |
1ec861eb | 3696 | drbd_err(connection, "incompatible %s settings\n", "data-integrity-alg"); |
fbc12f45 AG |
3697 | goto disconnect_rcu_unlock; |
3698 | } | |
b411b363 | 3699 | |
fbc12f45 | 3700 | rcu_read_unlock(); |
b411b363 PR |
3701 | } |
3702 | ||
7d4c782c AG |
3703 | if (integrity_alg[0]) { |
3704 | int hash_size; | |
3705 | ||
3706 | /* | |
3707 | * We can only change the peer data integrity algorithm | |
3708 | * here. Changing our own data integrity algorithm | |
3709 | * requires that we send a P_PROTOCOL_UPDATE packet at | |
3710 | * the same time; otherwise, the peer has no way to | |
3711 | * tell between which packets the algorithm should | |
3712 | * change. | |
3713 | */ | |
b411b363 | 3714 | |
3d234b33 | 3715 | peer_integrity_tfm = crypto_alloc_shash(integrity_alg, 0, 0); |
1b57e663 LE |
3716 | if (IS_ERR(peer_integrity_tfm)) { |
3717 | peer_integrity_tfm = NULL; | |
1ec861eb | 3718 | drbd_err(connection, "peer data-integrity-alg %s not supported\n", |
7d4c782c AG |
3719 | integrity_alg); |
3720 | goto disconnect; | |
3721 | } | |
b411b363 | 3722 | |
3d0e6375 | 3723 | hash_size = crypto_shash_digestsize(peer_integrity_tfm); |
7d4c782c AG |
3724 | int_dig_in = kmalloc(hash_size, GFP_KERNEL); |
3725 | int_dig_vv = kmalloc(hash_size, GFP_KERNEL); | |
3726 | if (!(int_dig_in && int_dig_vv)) { | |
1ec861eb | 3727 | drbd_err(connection, "Allocation of buffers for data integrity checking failed\n"); |
b411b363 PR |
3728 | goto disconnect; |
3729 | } | |
b411b363 PR |
3730 | } |
3731 | ||
7d4c782c | 3732 | new_net_conf = kmalloc(sizeof(struct net_conf), GFP_KERNEL); |
8404e191 | 3733 | if (!new_net_conf) |
7d4c782c | 3734 | goto disconnect; |
7d4c782c | 3735 | |
bde89a9e | 3736 | mutex_lock(&connection->data.mutex); |
0500813f | 3737 | mutex_lock(&connection->resource->conf_update); |
bde89a9e | 3738 | old_net_conf = connection->net_conf; |
7d4c782c AG |
3739 | *new_net_conf = *old_net_conf; |
3740 | ||
3741 | new_net_conf->wire_protocol = p_proto; | |
3742 | new_net_conf->after_sb_0p = convert_after_sb(p_after_sb_0p); | |
3743 | new_net_conf->after_sb_1p = convert_after_sb(p_after_sb_1p); | |
3744 | new_net_conf->after_sb_2p = convert_after_sb(p_after_sb_2p); | |
3745 | new_net_conf->two_primaries = p_two_primaries; | |
3746 | ||
bde89a9e | 3747 | rcu_assign_pointer(connection->net_conf, new_net_conf); |
0500813f | 3748 | mutex_unlock(&connection->resource->conf_update); |
bde89a9e | 3749 | mutex_unlock(&connection->data.mutex); |
7d4c782c | 3750 | |
3d0e6375 | 3751 | crypto_free_shash(connection->peer_integrity_tfm); |
bde89a9e AG |
3752 | kfree(connection->int_dig_in); |
3753 | kfree(connection->int_dig_vv); | |
3754 | connection->peer_integrity_tfm = peer_integrity_tfm; | |
3755 | connection->int_dig_in = int_dig_in; | |
3756 | connection->int_dig_vv = int_dig_vv; | |
7d4c782c AG |
3757 | |
3758 | if (strcmp(old_net_conf->integrity_alg, integrity_alg)) | |
1ec861eb | 3759 | drbd_info(connection, "peer data-integrity-alg: %s\n", |
7d4c782c AG |
3760 | integrity_alg[0] ? integrity_alg : "(none)"); |
3761 | ||
90c6c291 | 3762 | kvfree_rcu(old_net_conf); |
82bc0194 | 3763 | return 0; |
b411b363 | 3764 | |
44ed167d PR |
3765 | disconnect_rcu_unlock: |
3766 | rcu_read_unlock(); | |
b411b363 | 3767 | disconnect: |
3d0e6375 | 3768 | crypto_free_shash(peer_integrity_tfm); |
036b17ea PR |
3769 | kfree(int_dig_in); |
3770 | kfree(int_dig_vv); | |
bde89a9e | 3771 | conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 3772 | return -EIO; |
b411b363 PR |
3773 | } |
3774 | ||
3775 | /* helper function | |
3776 | * input: alg name, feature name | |
3777 | * return: NULL (alg name was "") | |
3778 | * ERR_PTR(error) if something goes wrong | |
3779 | * or the crypto hash ptr, if it worked out ok. */ | |
3d0e6375 KC |
3780 | static struct crypto_shash *drbd_crypto_alloc_digest_safe( |
3781 | const struct drbd_device *device, | |
b411b363 PR |
3782 | const char *alg, const char *name) |
3783 | { | |
3d0e6375 | 3784 | struct crypto_shash *tfm; |
b411b363 PR |
3785 | |
3786 | if (!alg[0]) | |
3787 | return NULL; | |
3788 | ||
3d0e6375 | 3789 | tfm = crypto_alloc_shash(alg, 0, 0); |
b411b363 | 3790 | if (IS_ERR(tfm)) { |
d0180171 | 3791 | drbd_err(device, "Can not allocate \"%s\" as %s (reason: %ld)\n", |
b411b363 PR |
3792 | alg, name, PTR_ERR(tfm)); |
3793 | return tfm; | |
3794 | } | |
b411b363 PR |
3795 | return tfm; |
3796 | } | |
3797 | ||
bde89a9e | 3798 | static int ignore_remaining_packet(struct drbd_connection *connection, struct packet_info *pi) |
4a76b161 | 3799 | { |
bde89a9e | 3800 | void *buffer = connection->data.rbuf; |
4a76b161 AG |
3801 | int size = pi->size; |
3802 | ||
3803 | while (size) { | |
3804 | int s = min_t(int, size, DRBD_SOCKET_BUFFER_SIZE); | |
bde89a9e | 3805 | s = drbd_recv(connection, buffer, s); |
4a76b161 AG |
3806 | if (s <= 0) { |
3807 | if (s < 0) | |
3808 | return s; | |
3809 | break; | |
3810 | } | |
3811 | size -= s; | |
3812 | } | |
3813 | if (size) | |
3814 | return -EIO; | |
3815 | return 0; | |
3816 | } | |
3817 | ||
3818 | /* | |
3819 | * config_unknown_volume - device configuration command for unknown volume | |
3820 | * | |
3821 | * When a device is added to an existing connection, the node on which the | |
3822 | * device is added first will send configuration commands to its peer but the | |
3823 | * peer will not know about the device yet. It will warn and ignore these | |
3824 | * commands. Once the device is added on the second node, the second node will | |
3825 | * send the same device configuration commands, but in the other direction. | |
3826 | * | |
3827 | * (We can also end up here if drbd is misconfigured.) | |
3828 | */ | |
bde89a9e | 3829 | static int config_unknown_volume(struct drbd_connection *connection, struct packet_info *pi) |
4a76b161 | 3830 | { |
1ec861eb | 3831 | drbd_warn(connection, "%s packet received for volume %u, which is not configured locally\n", |
2fcb8f30 | 3832 | cmdname(pi->cmd), pi->vnr); |
bde89a9e | 3833 | return ignore_remaining_packet(connection, pi); |
4a76b161 AG |
3834 | } |
3835 | ||
bde89a9e | 3836 | static int receive_SyncParam(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 3837 | { |
9f4fe9ad | 3838 | struct drbd_peer_device *peer_device; |
b30ab791 | 3839 | struct drbd_device *device; |
e658983a | 3840 | struct p_rs_param_95 *p; |
b411b363 | 3841 | unsigned int header_size, data_size, exp_max_sz; |
3d0e6375 KC |
3842 | struct crypto_shash *verify_tfm = NULL; |
3843 | struct crypto_shash *csums_tfm = NULL; | |
2ec91e0e | 3844 | struct net_conf *old_net_conf, *new_net_conf = NULL; |
813472ce | 3845 | struct disk_conf *old_disk_conf = NULL, *new_disk_conf = NULL; |
bde89a9e | 3846 | const int apv = connection->agreed_pro_version; |
813472ce | 3847 | struct fifo_buffer *old_plan = NULL, *new_plan = NULL; |
6a365874 | 3848 | unsigned int fifo_size = 0; |
82bc0194 | 3849 | int err; |
b411b363 | 3850 | |
9f4fe9ad AG |
3851 | peer_device = conn_peer_device(connection, pi->vnr); |
3852 | if (!peer_device) | |
bde89a9e | 3853 | return config_unknown_volume(connection, pi); |
9f4fe9ad | 3854 | device = peer_device->device; |
b411b363 PR |
3855 | |
3856 | exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) | |
3857 | : apv == 88 ? sizeof(struct p_rs_param) | |
3858 | + SHARED_SECRET_MAX | |
8e26f9cc PR |
3859 | : apv <= 94 ? sizeof(struct p_rs_param_89) |
3860 | : /* apv >= 95 */ sizeof(struct p_rs_param_95); | |
b411b363 | 3861 | |
e2857216 | 3862 | if (pi->size > exp_max_sz) { |
d0180171 | 3863 | drbd_err(device, "SyncParam packet too long: received %u, expected <= %u bytes\n", |
e2857216 | 3864 | pi->size, exp_max_sz); |
82bc0194 | 3865 | return -EIO; |
b411b363 PR |
3866 | } |
3867 | ||
3868 | if (apv <= 88) { | |
e658983a | 3869 | header_size = sizeof(struct p_rs_param); |
e2857216 | 3870 | data_size = pi->size - header_size; |
8e26f9cc | 3871 | } else if (apv <= 94) { |
e658983a | 3872 | header_size = sizeof(struct p_rs_param_89); |
e2857216 | 3873 | data_size = pi->size - header_size; |
0b0ba1ef | 3874 | D_ASSERT(device, data_size == 0); |
8e26f9cc | 3875 | } else { |
e658983a | 3876 | header_size = sizeof(struct p_rs_param_95); |
e2857216 | 3877 | data_size = pi->size - header_size; |
0b0ba1ef | 3878 | D_ASSERT(device, data_size == 0); |
b411b363 PR |
3879 | } |
3880 | ||
3881 | /* initialize verify_alg and csums_alg */ | |
e658983a | 3882 | p = pi->data; |
52a0cab3 KC |
3883 | BUILD_BUG_ON(sizeof(p->algs) != 2 * SHARED_SECRET_MAX); |
3884 | memset(&p->algs, 0, sizeof(p->algs)); | |
b411b363 | 3885 | |
9f4fe9ad | 3886 | err = drbd_recv_all(peer_device->connection, p, header_size); |
82bc0194 AG |
3887 | if (err) |
3888 | return err; | |
b411b363 | 3889 | |
0500813f | 3890 | mutex_lock(&connection->resource->conf_update); |
9f4fe9ad | 3891 | old_net_conf = peer_device->connection->net_conf; |
b30ab791 | 3892 | if (get_ldev(device)) { |
813472ce PR |
3893 | new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); |
3894 | if (!new_disk_conf) { | |
b30ab791 | 3895 | put_ldev(device); |
0500813f | 3896 | mutex_unlock(&connection->resource->conf_update); |
d0180171 | 3897 | drbd_err(device, "Allocation of new disk_conf failed\n"); |
813472ce PR |
3898 | return -ENOMEM; |
3899 | } | |
daeda1cc | 3900 | |
b30ab791 | 3901 | old_disk_conf = device->ldev->disk_conf; |
813472ce | 3902 | *new_disk_conf = *old_disk_conf; |
b411b363 | 3903 | |
6394b935 | 3904 | new_disk_conf->resync_rate = be32_to_cpu(p->resync_rate); |
813472ce | 3905 | } |
b411b363 PR |
3906 | |
3907 | if (apv >= 88) { | |
3908 | if (apv == 88) { | |
5de73827 | 3909 | if (data_size > SHARED_SECRET_MAX || data_size == 0) { |
d0180171 | 3910 | drbd_err(device, "verify-alg of wrong size, " |
5de73827 PR |
3911 | "peer wants %u, accepting only up to %u byte\n", |
3912 | data_size, SHARED_SECRET_MAX); | |
813472ce | 3913 | goto reconnect; |
b411b363 PR |
3914 | } |
3915 | ||
9f4fe9ad | 3916 | err = drbd_recv_all(peer_device->connection, p->verify_alg, data_size); |
813472ce PR |
3917 | if (err) |
3918 | goto reconnect; | |
b411b363 PR |
3919 | /* we expect NUL terminated string */ |
3920 | /* but just in case someone tries to be evil */ | |
0b0ba1ef | 3921 | D_ASSERT(device, p->verify_alg[data_size-1] == 0); |
b411b363 PR |
3922 | p->verify_alg[data_size-1] = 0; |
3923 | ||
3924 | } else /* apv >= 89 */ { | |
3925 | /* we still expect NUL terminated strings */ | |
3926 | /* but just in case someone tries to be evil */ | |
0b0ba1ef AG |
3927 | D_ASSERT(device, p->verify_alg[SHARED_SECRET_MAX-1] == 0); |
3928 | D_ASSERT(device, p->csums_alg[SHARED_SECRET_MAX-1] == 0); | |
b411b363 PR |
3929 | p->verify_alg[SHARED_SECRET_MAX-1] = 0; |
3930 | p->csums_alg[SHARED_SECRET_MAX-1] = 0; | |
3931 | } | |
3932 | ||
2ec91e0e | 3933 | if (strcmp(old_net_conf->verify_alg, p->verify_alg)) { |
b30ab791 | 3934 | if (device->state.conn == C_WF_REPORT_PARAMS) { |
d0180171 | 3935 | drbd_err(device, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", |
2ec91e0e | 3936 | old_net_conf->verify_alg, p->verify_alg); |
b411b363 PR |
3937 | goto disconnect; |
3938 | } | |
b30ab791 | 3939 | verify_tfm = drbd_crypto_alloc_digest_safe(device, |
b411b363 PR |
3940 | p->verify_alg, "verify-alg"); |
3941 | if (IS_ERR(verify_tfm)) { | |
3942 | verify_tfm = NULL; | |
3943 | goto disconnect; | |
3944 | } | |
3945 | } | |
3946 | ||
2ec91e0e | 3947 | if (apv >= 89 && strcmp(old_net_conf->csums_alg, p->csums_alg)) { |
b30ab791 | 3948 | if (device->state.conn == C_WF_REPORT_PARAMS) { |
d0180171 | 3949 | drbd_err(device, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", |
2ec91e0e | 3950 | old_net_conf->csums_alg, p->csums_alg); |
b411b363 PR |
3951 | goto disconnect; |
3952 | } | |
b30ab791 | 3953 | csums_tfm = drbd_crypto_alloc_digest_safe(device, |
b411b363 PR |
3954 | p->csums_alg, "csums-alg"); |
3955 | if (IS_ERR(csums_tfm)) { | |
3956 | csums_tfm = NULL; | |
3957 | goto disconnect; | |
3958 | } | |
3959 | } | |
3960 | ||
813472ce | 3961 | if (apv > 94 && new_disk_conf) { |
daeda1cc PR |
3962 | new_disk_conf->c_plan_ahead = be32_to_cpu(p->c_plan_ahead); |
3963 | new_disk_conf->c_delay_target = be32_to_cpu(p->c_delay_target); | |
3964 | new_disk_conf->c_fill_target = be32_to_cpu(p->c_fill_target); | |
3965 | new_disk_conf->c_max_rate = be32_to_cpu(p->c_max_rate); | |
778f271d | 3966 | |
daeda1cc | 3967 | fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ; |
b30ab791 | 3968 | if (fifo_size != device->rs_plan_s->size) { |
813472ce PR |
3969 | new_plan = fifo_alloc(fifo_size); |
3970 | if (!new_plan) { | |
d0180171 | 3971 | drbd_err(device, "kmalloc of fifo_buffer failed"); |
b30ab791 | 3972 | put_ldev(device); |
778f271d PR |
3973 | goto disconnect; |
3974 | } | |
3975 | } | |
8e26f9cc | 3976 | } |
b411b363 | 3977 | |
91fd4dad | 3978 | if (verify_tfm || csums_tfm) { |
2ec91e0e | 3979 | new_net_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL); |
8404e191 | 3980 | if (!new_net_conf) |
91fd4dad | 3981 | goto disconnect; |
91fd4dad | 3982 | |
2ec91e0e | 3983 | *new_net_conf = *old_net_conf; |
91fd4dad PR |
3984 | |
3985 | if (verify_tfm) { | |
2ec91e0e PR |
3986 | strcpy(new_net_conf->verify_alg, p->verify_alg); |
3987 | new_net_conf->verify_alg_len = strlen(p->verify_alg) + 1; | |
3d0e6375 | 3988 | crypto_free_shash(peer_device->connection->verify_tfm); |
9f4fe9ad | 3989 | peer_device->connection->verify_tfm = verify_tfm; |
d0180171 | 3990 | drbd_info(device, "using verify-alg: \"%s\"\n", p->verify_alg); |
91fd4dad PR |
3991 | } |
3992 | if (csums_tfm) { | |
2ec91e0e PR |
3993 | strcpy(new_net_conf->csums_alg, p->csums_alg); |
3994 | new_net_conf->csums_alg_len = strlen(p->csums_alg) + 1; | |
3d0e6375 | 3995 | crypto_free_shash(peer_device->connection->csums_tfm); |
9f4fe9ad | 3996 | peer_device->connection->csums_tfm = csums_tfm; |
d0180171 | 3997 | drbd_info(device, "using csums-alg: \"%s\"\n", p->csums_alg); |
91fd4dad | 3998 | } |
bde89a9e | 3999 | rcu_assign_pointer(connection->net_conf, new_net_conf); |
778f271d | 4000 | } |
b411b363 PR |
4001 | } |
4002 | ||
813472ce | 4003 | if (new_disk_conf) { |
b30ab791 AG |
4004 | rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf); |
4005 | put_ldev(device); | |
813472ce PR |
4006 | } |
4007 | ||
4008 | if (new_plan) { | |
b30ab791 AG |
4009 | old_plan = device->rs_plan_s; |
4010 | rcu_assign_pointer(device->rs_plan_s, new_plan); | |
b411b363 | 4011 | } |
daeda1cc | 4012 | |
0500813f | 4013 | mutex_unlock(&connection->resource->conf_update); |
daeda1cc PR |
4014 | synchronize_rcu(); |
4015 | if (new_net_conf) | |
4016 | kfree(old_net_conf); | |
4017 | kfree(old_disk_conf); | |
813472ce | 4018 | kfree(old_plan); |
daeda1cc | 4019 | |
82bc0194 | 4020 | return 0; |
b411b363 | 4021 | |
813472ce PR |
4022 | reconnect: |
4023 | if (new_disk_conf) { | |
b30ab791 | 4024 | put_ldev(device); |
813472ce PR |
4025 | kfree(new_disk_conf); |
4026 | } | |
0500813f | 4027 | mutex_unlock(&connection->resource->conf_update); |
813472ce PR |
4028 | return -EIO; |
4029 | ||
b411b363 | 4030 | disconnect: |
813472ce PR |
4031 | kfree(new_plan); |
4032 | if (new_disk_conf) { | |
b30ab791 | 4033 | put_ldev(device); |
813472ce PR |
4034 | kfree(new_disk_conf); |
4035 | } | |
0500813f | 4036 | mutex_unlock(&connection->resource->conf_update); |
b411b363 PR |
4037 | /* just for completeness: actually not needed, |
4038 | * as this is not reached if csums_tfm was ok. */ | |
3d0e6375 | 4039 | crypto_free_shash(csums_tfm); |
b411b363 | 4040 | /* but free the verify_tfm again, if csums_tfm did not work out */ |
3d0e6375 | 4041 | crypto_free_shash(verify_tfm); |
9f4fe9ad | 4042 | conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 4043 | return -EIO; |
b411b363 PR |
4044 | } |
4045 | ||
b411b363 | 4046 | /* warn if the arguments differ by more than 12.5% */ |
b30ab791 | 4047 | static void warn_if_differ_considerably(struct drbd_device *device, |
b411b363 PR |
4048 | const char *s, sector_t a, sector_t b) |
4049 | { | |
4050 | sector_t d; | |
4051 | if (a == 0 || b == 0) | |
4052 | return; | |
4053 | d = (a > b) ? (a - b) : (b - a); | |
4054 | if (d > (a>>3) || d > (b>>3)) | |
d0180171 | 4055 | drbd_warn(device, "Considerable difference in %s: %llus vs. %llus\n", s, |
b411b363 PR |
4056 | (unsigned long long)a, (unsigned long long)b); |
4057 | } | |
4058 | ||
bde89a9e | 4059 | static int receive_sizes(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 4060 | { |
9f4fe9ad | 4061 | struct drbd_peer_device *peer_device; |
b30ab791 | 4062 | struct drbd_device *device; |
e658983a | 4063 | struct p_sizes *p = pi->data; |
9104d31a | 4064 | struct o_qlim *o = (connection->agreed_features & DRBD_FF_WSAME) ? p->qlim : NULL; |
e96c9633 | 4065 | enum determine_dev_size dd = DS_UNCHANGED; |
6a8d68b1 | 4066 | sector_t p_size, p_usize, p_csize, my_usize; |
94c43a13 | 4067 | sector_t new_size, cur_size; |
b411b363 | 4068 | int ldsc = 0; /* local disk size changed */ |
e89b591c | 4069 | enum dds_flags ddsf; |
b411b363 | 4070 | |
9f4fe9ad AG |
4071 | peer_device = conn_peer_device(connection, pi->vnr); |
4072 | if (!peer_device) | |
bde89a9e | 4073 | return config_unknown_volume(connection, pi); |
9f4fe9ad | 4074 | device = peer_device->device; |
155bd9d1 | 4075 | cur_size = get_capacity(device->vdisk); |
4a76b161 | 4076 | |
b411b363 PR |
4077 | p_size = be64_to_cpu(p->d_size); |
4078 | p_usize = be64_to_cpu(p->u_size); | |
6a8d68b1 | 4079 | p_csize = be64_to_cpu(p->c_size); |
b411b363 | 4080 | |
b411b363 PR |
4081 | /* just store the peer's disk size for now. |
4082 | * we still need to figure out whether we accept that. */ | |
b30ab791 | 4083 | device->p_size = p_size; |
b411b363 | 4084 | |
b30ab791 | 4085 | if (get_ldev(device)) { |
daeda1cc | 4086 | rcu_read_lock(); |
b30ab791 | 4087 | my_usize = rcu_dereference(device->ldev->disk_conf)->disk_size; |
daeda1cc PR |
4088 | rcu_read_unlock(); |
4089 | ||
b30ab791 AG |
4090 | warn_if_differ_considerably(device, "lower level device sizes", |
4091 | p_size, drbd_get_max_capacity(device->ldev)); | |
4092 | warn_if_differ_considerably(device, "user requested size", | |
daeda1cc | 4093 | p_usize, my_usize); |
b411b363 PR |
4094 | |
4095 | /* if this is the first connect, or an otherwise expected | |
4096 | * param exchange, choose the minimum */ | |
b30ab791 | 4097 | if (device->state.conn == C_WF_REPORT_PARAMS) |
daeda1cc | 4098 | p_usize = min_not_zero(my_usize, p_usize); |
b411b363 | 4099 | |
ad6e8979 LE |
4100 | /* Never shrink a device with usable data during connect, |
4101 | * or "attach" on the peer. | |
4102 | * But allow online shrinking if we are connected. */ | |
60bac040 | 4103 | new_size = drbd_new_dev_size(device, device->ldev, p_usize, 0); |
60bac040 | 4104 | if (new_size < cur_size && |
b30ab791 | 4105 | device->state.disk >= D_OUTDATED && |
ad6e8979 | 4106 | (device->state.conn < C_CONNECTED || device->state.pdsk == D_DISKLESS)) { |
60bac040 LE |
4107 | drbd_err(device, "The peer's disk size is too small! (%llu < %llu sectors)\n", |
4108 | (unsigned long long)new_size, (unsigned long long)cur_size); | |
9f4fe9ad | 4109 | conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
b30ab791 | 4110 | put_ldev(device); |
82bc0194 | 4111 | return -EIO; |
b411b363 | 4112 | } |
daeda1cc PR |
4113 | |
4114 | if (my_usize != p_usize) { | |
4115 | struct disk_conf *old_disk_conf, *new_disk_conf = NULL; | |
4116 | ||
4117 | new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); | |
4118 | if (!new_disk_conf) { | |
b30ab791 | 4119 | put_ldev(device); |
daeda1cc PR |
4120 | return -ENOMEM; |
4121 | } | |
4122 | ||
0500813f | 4123 | mutex_lock(&connection->resource->conf_update); |
b30ab791 | 4124 | old_disk_conf = device->ldev->disk_conf; |
daeda1cc PR |
4125 | *new_disk_conf = *old_disk_conf; |
4126 | new_disk_conf->disk_size = p_usize; | |
4127 | ||
b30ab791 | 4128 | rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf); |
0500813f | 4129 | mutex_unlock(&connection->resource->conf_update); |
90c6c291 | 4130 | kvfree_rcu(old_disk_conf); |
daeda1cc | 4131 | |
ad6e8979 LE |
4132 | drbd_info(device, "Peer sets u_size to %lu sectors (old: %lu)\n", |
4133 | (unsigned long)p_usize, (unsigned long)my_usize); | |
b411b363 | 4134 | } |
daeda1cc | 4135 | |
b30ab791 | 4136 | put_ldev(device); |
b411b363 | 4137 | } |
b411b363 | 4138 | |
20c68fde | 4139 | device->peer_max_bio_size = be32_to_cpu(p->max_bio_size); |
dd4f699d | 4140 | /* Leave drbd_reconsider_queue_parameters() before drbd_determine_dev_size(). |
20c68fde | 4141 | In case we cleared the QUEUE_FLAG_DISCARD from our queue in |
dd4f699d | 4142 | drbd_reconsider_queue_parameters(), we can be sure that after |
20c68fde LE |
4143 | drbd_determine_dev_size() no REQ_DISCARDs are in the queue. */ |
4144 | ||
e89b591c | 4145 | ddsf = be16_to_cpu(p->dds_flags); |
b30ab791 | 4146 | if (get_ldev(device)) { |
9104d31a | 4147 | drbd_reconsider_queue_parameters(device, device->ldev, o); |
b30ab791 AG |
4148 | dd = drbd_determine_dev_size(device, ddsf, NULL); |
4149 | put_ldev(device); | |
e96c9633 | 4150 | if (dd == DS_ERROR) |
82bc0194 | 4151 | return -EIO; |
b30ab791 | 4152 | drbd_md_sync(device); |
b411b363 | 4153 | } else { |
6a8d68b1 LE |
4154 | /* |
4155 | * I am diskless, need to accept the peer's *current* size. | |
4156 | * I must NOT accept the peers backing disk size, | |
4157 | * it may have been larger than mine all along... | |
4158 | * | |
4159 | * At this point, the peer knows more about my disk, or at | |
4160 | * least about what we last agreed upon, than myself. | |
4161 | * So if his c_size is less than his d_size, the most likely | |
4162 | * reason is that *my* d_size was smaller last time we checked. | |
4163 | * | |
4164 | * However, if he sends a zero current size, | |
4165 | * take his (user-capped or) backing disk size anyways. | |
94c43a13 LE |
4166 | * |
4167 | * Unless of course he does not have a disk himself. | |
4168 | * In which case we ignore this completely. | |
6a8d68b1 | 4169 | */ |
94c43a13 | 4170 | sector_t new_size = p_csize ?: p_usize ?: p_size; |
9104d31a | 4171 | drbd_reconsider_queue_parameters(device, NULL, o); |
94c43a13 LE |
4172 | if (new_size == 0) { |
4173 | /* Ignore, peer does not know nothing. */ | |
4174 | } else if (new_size == cur_size) { | |
4175 | /* nothing to do */ | |
4176 | } else if (cur_size != 0 && p_size == 0) { | |
4177 | drbd_warn(device, "Ignored diskless peer device size (peer:%llu != me:%llu sectors)!\n", | |
4178 | (unsigned long long)new_size, (unsigned long long)cur_size); | |
4179 | } else if (new_size < cur_size && device->state.role == R_PRIMARY) { | |
4180 | drbd_err(device, "The peer's device size is too small! (%llu < %llu sectors); demote me first!\n", | |
4181 | (unsigned long long)new_size, (unsigned long long)cur_size); | |
4182 | conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); | |
4183 | return -EIO; | |
4184 | } else { | |
4185 | /* I believe the peer, if | |
4186 | * - I don't have a current size myself | |
4187 | * - we agree on the size anyways | |
4188 | * - I do have a current size, am Secondary, | |
4189 | * and he has the only disk | |
4190 | * - I do have a current size, am Primary, | |
4191 | * and he has the only disk, | |
4192 | * which is larger than my current size | |
4193 | */ | |
4194 | drbd_set_my_capacity(device, new_size); | |
4195 | } | |
b411b363 PR |
4196 | } |
4197 | ||
b30ab791 AG |
4198 | if (get_ldev(device)) { |
4199 | if (device->ldev->known_size != drbd_get_capacity(device->ldev->backing_bdev)) { | |
4200 | device->ldev->known_size = drbd_get_capacity(device->ldev->backing_bdev); | |
b411b363 PR |
4201 | ldsc = 1; |
4202 | } | |
4203 | ||
b30ab791 | 4204 | put_ldev(device); |
b411b363 PR |
4205 | } |
4206 | ||
b30ab791 | 4207 | if (device->state.conn > C_WF_REPORT_PARAMS) { |
155bd9d1 CH |
4208 | if (be64_to_cpu(p->c_size) != get_capacity(device->vdisk) || |
4209 | ldsc) { | |
b411b363 PR |
4210 | /* we have different sizes, probably peer |
4211 | * needs to know my new size... */ | |
69a22773 | 4212 | drbd_send_sizes(peer_device, 0, ddsf); |
b411b363 | 4213 | } |
b30ab791 AG |
4214 | if (test_and_clear_bit(RESIZE_PENDING, &device->flags) || |
4215 | (dd == DS_GREW && device->state.conn == C_CONNECTED)) { | |
4216 | if (device->state.pdsk >= D_INCONSISTENT && | |
4217 | device->state.disk >= D_INCONSISTENT) { | |
e89b591c | 4218 | if (ddsf & DDSF_NO_RESYNC) |
d0180171 | 4219 | drbd_info(device, "Resync of new storage suppressed with --assume-clean\n"); |
e89b591c | 4220 | else |
b30ab791 | 4221 | resync_after_online_grow(device); |
e89b591c | 4222 | } else |
b30ab791 | 4223 | set_bit(RESYNC_AFTER_NEG, &device->flags); |
b411b363 PR |
4224 | } |
4225 | } | |
4226 | ||
82bc0194 | 4227 | return 0; |
b411b363 PR |
4228 | } |
4229 | ||
bde89a9e | 4230 | static int receive_uuids(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 4231 | { |
9f4fe9ad | 4232 | struct drbd_peer_device *peer_device; |
b30ab791 | 4233 | struct drbd_device *device; |
e658983a | 4234 | struct p_uuids *p = pi->data; |
b411b363 | 4235 | u64 *p_uuid; |
62b0da3a | 4236 | int i, updated_uuids = 0; |
b411b363 | 4237 | |
9f4fe9ad AG |
4238 | peer_device = conn_peer_device(connection, pi->vnr); |
4239 | if (!peer_device) | |
bde89a9e | 4240 | return config_unknown_volume(connection, pi); |
9f4fe9ad | 4241 | device = peer_device->device; |
4a76b161 | 4242 | |
365cf663 | 4243 | p_uuid = kmalloc_array(UI_EXTENDED_SIZE, sizeof(*p_uuid), GFP_NOIO); |
8404e191 | 4244 | if (!p_uuid) |
063eacf8 | 4245 | return false; |
b411b363 PR |
4246 | |
4247 | for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) | |
4248 | p_uuid[i] = be64_to_cpu(p->uuid[i]); | |
4249 | ||
b30ab791 AG |
4250 | kfree(device->p_uuid); |
4251 | device->p_uuid = p_uuid; | |
b411b363 | 4252 | |
b17b5960 | 4253 | if ((device->state.conn < C_CONNECTED || device->state.pdsk == D_DISKLESS) && |
b30ab791 AG |
4254 | device->state.disk < D_INCONSISTENT && |
4255 | device->state.role == R_PRIMARY && | |
4256 | (device->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { | |
d0180171 | 4257 | drbd_err(device, "Can only connect to data with current UUID=%016llX\n", |
b30ab791 | 4258 | (unsigned long long)device->ed_uuid); |
9f4fe9ad | 4259 | conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 4260 | return -EIO; |
b411b363 PR |
4261 | } |
4262 | ||
b30ab791 | 4263 | if (get_ldev(device)) { |
b411b363 | 4264 | int skip_initial_sync = |
b30ab791 | 4265 | device->state.conn == C_CONNECTED && |
9f4fe9ad | 4266 | peer_device->connection->agreed_pro_version >= 90 && |
b30ab791 | 4267 | device->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && |
b411b363 PR |
4268 | (p_uuid[UI_FLAGS] & 8); |
4269 | if (skip_initial_sync) { | |
d0180171 | 4270 | drbd_info(device, "Accepted new current UUID, preparing to skip initial sync\n"); |
b30ab791 | 4271 | drbd_bitmap_io(device, &drbd_bmio_clear_n_write, |
20ceb2b2 LE |
4272 | "clear_n_write from receive_uuids", |
4273 | BM_LOCKED_TEST_ALLOWED); | |
b30ab791 AG |
4274 | _drbd_uuid_set(device, UI_CURRENT, p_uuid[UI_CURRENT]); |
4275 | _drbd_uuid_set(device, UI_BITMAP, 0); | |
4276 | _drbd_set_state(_NS2(device, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), | |
b411b363 | 4277 | CS_VERBOSE, NULL); |
b30ab791 | 4278 | drbd_md_sync(device); |
62b0da3a | 4279 | updated_uuids = 1; |
b411b363 | 4280 | } |
b30ab791 AG |
4281 | put_ldev(device); |
4282 | } else if (device->state.disk < D_INCONSISTENT && | |
4283 | device->state.role == R_PRIMARY) { | |
18a50fa2 PR |
4284 | /* I am a diskless primary, the peer just created a new current UUID |
4285 | for me. */ | |
b30ab791 | 4286 | updated_uuids = drbd_set_ed_uuid(device, p_uuid[UI_CURRENT]); |
b411b363 PR |
4287 | } |
4288 | ||
4289 | /* Before we test for the disk state, we should wait until an eventually | |
4290 | ongoing cluster wide state change is finished. That is important if | |
4291 | we are primary and are detaching from our disk. We need to see the | |
4292 | new disk state... */ | |
b30ab791 AG |
4293 | mutex_lock(device->state_mutex); |
4294 | mutex_unlock(device->state_mutex); | |
4295 | if (device->state.conn >= C_CONNECTED && device->state.disk < D_INCONSISTENT) | |
4296 | updated_uuids |= drbd_set_ed_uuid(device, p_uuid[UI_CURRENT]); | |
62b0da3a LE |
4297 | |
4298 | if (updated_uuids) | |
b30ab791 | 4299 | drbd_print_uuids(device, "receiver updated UUIDs to"); |
b411b363 | 4300 | |
82bc0194 | 4301 | return 0; |
b411b363 PR |
4302 | } |
4303 | ||
4304 | /** | |
4305 | * convert_state() - Converts the peer's view of the cluster state to our point of view | |
4306 | * @ps: The state as seen by the peer. | |
4307 | */ | |
4308 | static union drbd_state convert_state(union drbd_state ps) | |
4309 | { | |
4310 | union drbd_state ms; | |
4311 | ||
4312 | static enum drbd_conns c_tab[] = { | |
369bea63 | 4313 | [C_WF_REPORT_PARAMS] = C_WF_REPORT_PARAMS, |
b411b363 PR |
4314 | [C_CONNECTED] = C_CONNECTED, |
4315 | ||
4316 | [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, | |
4317 | [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, | |
4318 | [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ | |
4319 | [C_VERIFY_S] = C_VERIFY_T, | |
4320 | [C_MASK] = C_MASK, | |
4321 | }; | |
4322 | ||
4323 | ms.i = ps.i; | |
4324 | ||
4325 | ms.conn = c_tab[ps.conn]; | |
4326 | ms.peer = ps.role; | |
4327 | ms.role = ps.peer; | |
4328 | ms.pdsk = ps.disk; | |
4329 | ms.disk = ps.pdsk; | |
4330 | ms.peer_isp = (ps.aftr_isp | ps.user_isp); | |
4331 | ||
4332 | return ms; | |
4333 | } | |
4334 | ||
bde89a9e | 4335 | static int receive_req_state(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 4336 | { |
9f4fe9ad | 4337 | struct drbd_peer_device *peer_device; |
b30ab791 | 4338 | struct drbd_device *device; |
e658983a | 4339 | struct p_req_state *p = pi->data; |
b411b363 | 4340 | union drbd_state mask, val; |
bf885f8a | 4341 | enum drbd_state_rv rv; |
b411b363 | 4342 | |
9f4fe9ad AG |
4343 | peer_device = conn_peer_device(connection, pi->vnr); |
4344 | if (!peer_device) | |
4a76b161 | 4345 | return -EIO; |
9f4fe9ad | 4346 | device = peer_device->device; |
4a76b161 | 4347 | |
b411b363 PR |
4348 | mask.i = be32_to_cpu(p->mask); |
4349 | val.i = be32_to_cpu(p->val); | |
4350 | ||
9f4fe9ad | 4351 | if (test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags) && |
b30ab791 | 4352 | mutex_is_locked(device->state_mutex)) { |
69a22773 | 4353 | drbd_send_sr_reply(peer_device, SS_CONCURRENT_ST_CHG); |
82bc0194 | 4354 | return 0; |
b411b363 PR |
4355 | } |
4356 | ||
4357 | mask = convert_state(mask); | |
4358 | val = convert_state(val); | |
4359 | ||
b30ab791 | 4360 | rv = drbd_change_state(device, CS_VERBOSE, mask, val); |
69a22773 | 4361 | drbd_send_sr_reply(peer_device, rv); |
b411b363 | 4362 | |
b30ab791 | 4363 | drbd_md_sync(device); |
b411b363 | 4364 | |
82bc0194 | 4365 | return 0; |
b411b363 PR |
4366 | } |
4367 | ||
bde89a9e | 4368 | static int receive_req_conn_state(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 4369 | { |
e658983a | 4370 | struct p_req_state *p = pi->data; |
b411b363 | 4371 | union drbd_state mask, val; |
bf885f8a | 4372 | enum drbd_state_rv rv; |
b411b363 | 4373 | |
b411b363 PR |
4374 | mask.i = be32_to_cpu(p->mask); |
4375 | val.i = be32_to_cpu(p->val); | |
4376 | ||
bde89a9e AG |
4377 | if (test_bit(RESOLVE_CONFLICTS, &connection->flags) && |
4378 | mutex_is_locked(&connection->cstate_mutex)) { | |
4379 | conn_send_sr_reply(connection, SS_CONCURRENT_ST_CHG); | |
82bc0194 | 4380 | return 0; |
b411b363 PR |
4381 | } |
4382 | ||
4383 | mask = convert_state(mask); | |
4384 | val = convert_state(val); | |
4385 | ||
bde89a9e AG |
4386 | rv = conn_request_state(connection, mask, val, CS_VERBOSE | CS_LOCAL_ONLY | CS_IGN_OUTD_FAIL); |
4387 | conn_send_sr_reply(connection, rv); | |
b411b363 | 4388 | |
82bc0194 | 4389 | return 0; |
b411b363 PR |
4390 | } |
4391 | ||
bde89a9e | 4392 | static int receive_state(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 4393 | { |
9f4fe9ad | 4394 | struct drbd_peer_device *peer_device; |
b30ab791 | 4395 | struct drbd_device *device; |
e658983a | 4396 | struct p_state *p = pi->data; |
4ac4aada | 4397 | union drbd_state os, ns, peer_state; |
b411b363 | 4398 | enum drbd_disk_state real_peer_disk; |
65d922c3 | 4399 | enum chg_state_flags cs_flags; |
b411b363 PR |
4400 | int rv; |
4401 | ||
9f4fe9ad AG |
4402 | peer_device = conn_peer_device(connection, pi->vnr); |
4403 | if (!peer_device) | |
bde89a9e | 4404 | return config_unknown_volume(connection, pi); |
9f4fe9ad | 4405 | device = peer_device->device; |
4a76b161 | 4406 | |
b411b363 PR |
4407 | peer_state.i = be32_to_cpu(p->state); |
4408 | ||
4409 | real_peer_disk = peer_state.disk; | |
4410 | if (peer_state.disk == D_NEGOTIATING) { | |
b30ab791 | 4411 | real_peer_disk = device->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; |
d0180171 | 4412 | drbd_info(device, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); |
b411b363 PR |
4413 | } |
4414 | ||
0500813f | 4415 | spin_lock_irq(&device->resource->req_lock); |
b411b363 | 4416 | retry: |
b30ab791 | 4417 | os = ns = drbd_read_state(device); |
0500813f | 4418 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 | 4419 | |
668700b4 | 4420 | /* If some other part of the code (ack_receiver thread, timeout) |
545752d5 LE |
4421 | * already decided to close the connection again, |
4422 | * we must not "re-establish" it here. */ | |
4423 | if (os.conn <= C_TEAR_DOWN) | |
58ffa580 | 4424 | return -ECONNRESET; |
545752d5 | 4425 | |
40424e4a LE |
4426 | /* If this is the "end of sync" confirmation, usually the peer disk |
4427 | * transitions from D_INCONSISTENT to D_UP_TO_DATE. For empty (0 bits | |
4428 | * set) resync started in PausedSyncT, or if the timing of pause-/ | |
4429 | * unpause-sync events has been "just right", the peer disk may | |
4430 | * transition from D_CONSISTENT to D_UP_TO_DATE as well. | |
4431 | */ | |
4432 | if ((os.pdsk == D_INCONSISTENT || os.pdsk == D_CONSISTENT) && | |
4433 | real_peer_disk == D_UP_TO_DATE && | |
e9ef7bb6 LE |
4434 | os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { |
4435 | /* If we are (becoming) SyncSource, but peer is still in sync | |
4436 | * preparation, ignore its uptodate-ness to avoid flapping, it | |
4437 | * will change to inconsistent once the peer reaches active | |
4438 | * syncing states. | |
4439 | * It may have changed syncer-paused flags, however, so we | |
4440 | * cannot ignore this completely. */ | |
4441 | if (peer_state.conn > C_CONNECTED && | |
4442 | peer_state.conn < C_SYNC_SOURCE) | |
4443 | real_peer_disk = D_INCONSISTENT; | |
4444 | ||
4445 | /* if peer_state changes to connected at the same time, | |
4446 | * it explicitly notifies us that it finished resync. | |
4447 | * Maybe we should finish it up, too? */ | |
4448 | else if (os.conn >= C_SYNC_SOURCE && | |
4449 | peer_state.conn == C_CONNECTED) { | |
b30ab791 AG |
4450 | if (drbd_bm_total_weight(device) <= device->rs_failed) |
4451 | drbd_resync_finished(device); | |
82bc0194 | 4452 | return 0; |
e9ef7bb6 LE |
4453 | } |
4454 | } | |
4455 | ||
02b91b55 LE |
4456 | /* explicit verify finished notification, stop sector reached. */ |
4457 | if (os.conn == C_VERIFY_T && os.disk == D_UP_TO_DATE && | |
4458 | peer_state.conn == C_CONNECTED && real_peer_disk == D_UP_TO_DATE) { | |
b30ab791 AG |
4459 | ov_out_of_sync_print(device); |
4460 | drbd_resync_finished(device); | |
58ffa580 | 4461 | return 0; |
02b91b55 LE |
4462 | } |
4463 | ||
e9ef7bb6 LE |
4464 | /* peer says his disk is inconsistent, while we think it is uptodate, |
4465 | * and this happens while the peer still thinks we have a sync going on, | |
4466 | * but we think we are already done with the sync. | |
4467 | * We ignore this to avoid flapping pdsk. | |
4468 | * This should not happen, if the peer is a recent version of drbd. */ | |
4469 | if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && | |
4470 | os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) | |
4471 | real_peer_disk = D_UP_TO_DATE; | |
4472 | ||
4ac4aada LE |
4473 | if (ns.conn == C_WF_REPORT_PARAMS) |
4474 | ns.conn = C_CONNECTED; | |
b411b363 | 4475 | |
67531718 PR |
4476 | if (peer_state.conn == C_AHEAD) |
4477 | ns.conn = C_BEHIND; | |
4478 | ||
fe43ed97 LE |
4479 | /* TODO: |
4480 | * if (primary and diskless and peer uuid != effective uuid) | |
4481 | * abort attach on peer; | |
4482 | * | |
4483 | * If this node does not have good data, was already connected, but | |
4484 | * the peer did a late attach only now, trying to "negotiate" with me, | |
4485 | * AND I am currently Primary, possibly frozen, with some specific | |
4486 | * "effective" uuid, this should never be reached, really, because | |
4487 | * we first send the uuids, then the current state. | |
4488 | * | |
4489 | * In this scenario, we already dropped the connection hard | |
4490 | * when we received the unsuitable uuids (receive_uuids(). | |
4491 | * | |
4492 | * Should we want to change this, that is: not drop the connection in | |
4493 | * receive_uuids() already, then we would need to add a branch here | |
4494 | * that aborts the attach of "unsuitable uuids" on the peer in case | |
4495 | * this node is currently Diskless Primary. | |
4496 | */ | |
4497 | ||
b30ab791 AG |
4498 | if (device->p_uuid && peer_state.disk >= D_NEGOTIATING && |
4499 | get_ldev_if_state(device, D_NEGOTIATING)) { | |
b411b363 PR |
4500 | int cr; /* consider resync */ |
4501 | ||
4502 | /* if we established a new connection */ | |
4ac4aada | 4503 | cr = (os.conn < C_CONNECTED); |
b411b363 PR |
4504 | /* if we had an established connection |
4505 | * and one of the nodes newly attaches a disk */ | |
4ac4aada | 4506 | cr |= (os.conn == C_CONNECTED && |
b411b363 | 4507 | (peer_state.disk == D_NEGOTIATING || |
4ac4aada | 4508 | os.disk == D_NEGOTIATING)); |
b411b363 | 4509 | /* if we have both been inconsistent, and the peer has been |
a2823ea9 | 4510 | * forced to be UpToDate with --force */ |
b30ab791 | 4511 | cr |= test_bit(CONSIDER_RESYNC, &device->flags); |
b411b363 PR |
4512 | /* if we had been plain connected, and the admin requested to |
4513 | * start a sync by "invalidate" or "invalidate-remote" */ | |
4ac4aada | 4514 | cr |= (os.conn == C_CONNECTED && |
b411b363 PR |
4515 | (peer_state.conn >= C_STARTING_SYNC_S && |
4516 | peer_state.conn <= C_WF_BITMAP_T)); | |
4517 | ||
4518 | if (cr) | |
69a22773 | 4519 | ns.conn = drbd_sync_handshake(peer_device, peer_state.role, real_peer_disk); |
b411b363 | 4520 | |
b30ab791 | 4521 | put_ldev(device); |
4ac4aada LE |
4522 | if (ns.conn == C_MASK) { |
4523 | ns.conn = C_CONNECTED; | |
b30ab791 AG |
4524 | if (device->state.disk == D_NEGOTIATING) { |
4525 | drbd_force_state(device, NS(disk, D_FAILED)); | |
b411b363 | 4526 | } else if (peer_state.disk == D_NEGOTIATING) { |
d0180171 | 4527 | drbd_err(device, "Disk attach process on the peer node was aborted.\n"); |
b411b363 | 4528 | peer_state.disk = D_DISKLESS; |
580b9767 | 4529 | real_peer_disk = D_DISKLESS; |
b411b363 | 4530 | } else { |
9f4fe9ad | 4531 | if (test_and_clear_bit(CONN_DRY_RUN, &peer_device->connection->flags)) |
82bc0194 | 4532 | return -EIO; |
0b0ba1ef | 4533 | D_ASSERT(device, os.conn == C_WF_REPORT_PARAMS); |
9f4fe9ad | 4534 | conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 4535 | return -EIO; |
b411b363 PR |
4536 | } |
4537 | } | |
4538 | } | |
4539 | ||
0500813f | 4540 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 | 4541 | if (os.i != drbd_read_state(device).i) |
b411b363 | 4542 | goto retry; |
b30ab791 | 4543 | clear_bit(CONSIDER_RESYNC, &device->flags); |
b411b363 PR |
4544 | ns.peer = peer_state.role; |
4545 | ns.pdsk = real_peer_disk; | |
4546 | ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); | |
4ac4aada | 4547 | if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) |
b30ab791 | 4548 | ns.disk = device->new_state_tmp.disk; |
4ac4aada | 4549 | cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); |
b30ab791 AG |
4550 | if (ns.pdsk == D_CONSISTENT && drbd_suspended(device) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && |
4551 | test_bit(NEW_CUR_UUID, &device->flags)) { | |
8554df1c | 4552 | /* Do not allow tl_restart(RESEND) for a rebooted peer. We can only allow this |
481c6f50 | 4553 | for temporal network outages! */ |
0500813f | 4554 | spin_unlock_irq(&device->resource->req_lock); |
d0180171 | 4555 | drbd_err(device, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); |
9f4fe9ad | 4556 | tl_clear(peer_device->connection); |
b30ab791 AG |
4557 | drbd_uuid_new_current(device); |
4558 | clear_bit(NEW_CUR_UUID, &device->flags); | |
9f4fe9ad | 4559 | conn_request_state(peer_device->connection, NS2(conn, C_PROTOCOL_ERROR, susp, 0), CS_HARD); |
82bc0194 | 4560 | return -EIO; |
481c6f50 | 4561 | } |
b30ab791 AG |
4562 | rv = _drbd_set_state(device, ns, cs_flags, NULL); |
4563 | ns = drbd_read_state(device); | |
0500813f | 4564 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 PR |
4565 | |
4566 | if (rv < SS_SUCCESS) { | |
9f4fe9ad | 4567 | conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 4568 | return -EIO; |
b411b363 PR |
4569 | } |
4570 | ||
4ac4aada LE |
4571 | if (os.conn > C_WF_REPORT_PARAMS) { |
4572 | if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED && | |
b411b363 PR |
4573 | peer_state.disk != D_NEGOTIATING ) { |
4574 | /* we want resync, peer has not yet decided to sync... */ | |
4575 | /* Nowadays only used when forcing a node into primary role and | |
4576 | setting its disk to UpToDate with that */ | |
69a22773 AG |
4577 | drbd_send_uuids(peer_device); |
4578 | drbd_send_current_state(peer_device); | |
b411b363 PR |
4579 | } |
4580 | } | |
4581 | ||
b30ab791 | 4582 | clear_bit(DISCARD_MY_DATA, &device->flags); |
b411b363 | 4583 | |
b30ab791 | 4584 | drbd_md_sync(device); /* update connected indicator, la_size_sect, ... */ |
b411b363 | 4585 | |
82bc0194 | 4586 | return 0; |
b411b363 PR |
4587 | } |
4588 | ||
bde89a9e | 4589 | static int receive_sync_uuid(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 4590 | { |
9f4fe9ad | 4591 | struct drbd_peer_device *peer_device; |
b30ab791 | 4592 | struct drbd_device *device; |
e658983a | 4593 | struct p_rs_uuid *p = pi->data; |
4a76b161 | 4594 | |
9f4fe9ad AG |
4595 | peer_device = conn_peer_device(connection, pi->vnr); |
4596 | if (!peer_device) | |
4a76b161 | 4597 | return -EIO; |
9f4fe9ad | 4598 | device = peer_device->device; |
b411b363 | 4599 | |
b30ab791 AG |
4600 | wait_event(device->misc_wait, |
4601 | device->state.conn == C_WF_SYNC_UUID || | |
4602 | device->state.conn == C_BEHIND || | |
4603 | device->state.conn < C_CONNECTED || | |
4604 | device->state.disk < D_NEGOTIATING); | |
b411b363 | 4605 | |
0b0ba1ef | 4606 | /* D_ASSERT(device, device->state.conn == C_WF_SYNC_UUID ); */ |
b411b363 | 4607 | |
b411b363 PR |
4608 | /* Here the _drbd_uuid_ functions are right, current should |
4609 | _not_ be rotated into the history */ | |
b30ab791 AG |
4610 | if (get_ldev_if_state(device, D_NEGOTIATING)) { |
4611 | _drbd_uuid_set(device, UI_CURRENT, be64_to_cpu(p->uuid)); | |
4612 | _drbd_uuid_set(device, UI_BITMAP, 0UL); | |
b411b363 | 4613 | |
b30ab791 AG |
4614 | drbd_print_uuids(device, "updated sync uuid"); |
4615 | drbd_start_resync(device, C_SYNC_TARGET); | |
b411b363 | 4616 | |
b30ab791 | 4617 | put_ldev(device); |
b411b363 | 4618 | } else |
d0180171 | 4619 | drbd_err(device, "Ignoring SyncUUID packet!\n"); |
b411b363 | 4620 | |
82bc0194 | 4621 | return 0; |
b411b363 PR |
4622 | } |
4623 | ||
9b48ff07 | 4624 | /* |
2c46407d AG |
4625 | * receive_bitmap_plain |
4626 | * | |
4627 | * Return 0 when done, 1 when another iteration is needed, and a negative error | |
4628 | * code upon failure. | |
4629 | */ | |
4630 | static int | |
69a22773 | 4631 | receive_bitmap_plain(struct drbd_peer_device *peer_device, unsigned int size, |
e658983a | 4632 | unsigned long *p, struct bm_xfer_ctx *c) |
b411b363 | 4633 | { |
50d0b1ad | 4634 | unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - |
69a22773 | 4635 | drbd_header_size(peer_device->connection); |
e658983a | 4636 | unsigned int num_words = min_t(size_t, data_size / sizeof(*p), |
50d0b1ad | 4637 | c->bm_words - c->word_offset); |
e658983a | 4638 | unsigned int want = num_words * sizeof(*p); |
2c46407d | 4639 | int err; |
b411b363 | 4640 | |
50d0b1ad | 4641 | if (want != size) { |
69a22773 | 4642 | drbd_err(peer_device, "%s:want (%u) != size (%u)\n", __func__, want, size); |
2c46407d | 4643 | return -EIO; |
b411b363 PR |
4644 | } |
4645 | if (want == 0) | |
2c46407d | 4646 | return 0; |
69a22773 | 4647 | err = drbd_recv_all(peer_device->connection, p, want); |
82bc0194 | 4648 | if (err) |
2c46407d | 4649 | return err; |
b411b363 | 4650 | |
69a22773 | 4651 | drbd_bm_merge_lel(peer_device->device, c->word_offset, num_words, p); |
b411b363 PR |
4652 | |
4653 | c->word_offset += num_words; | |
4654 | c->bit_offset = c->word_offset * BITS_PER_LONG; | |
4655 | if (c->bit_offset > c->bm_bits) | |
4656 | c->bit_offset = c->bm_bits; | |
4657 | ||
2c46407d | 4658 | return 1; |
b411b363 PR |
4659 | } |
4660 | ||
a02d1240 AG |
4661 | static enum drbd_bitmap_code dcbp_get_code(struct p_compressed_bm *p) |
4662 | { | |
4663 | return (enum drbd_bitmap_code)(p->encoding & 0x0f); | |
4664 | } | |
4665 | ||
4666 | static int dcbp_get_start(struct p_compressed_bm *p) | |
4667 | { | |
4668 | return (p->encoding & 0x80) != 0; | |
4669 | } | |
4670 | ||
4671 | static int dcbp_get_pad_bits(struct p_compressed_bm *p) | |
4672 | { | |
4673 | return (p->encoding >> 4) & 0x7; | |
4674 | } | |
4675 | ||
9b48ff07 | 4676 | /* |
2c46407d AG |
4677 | * recv_bm_rle_bits |
4678 | * | |
4679 | * Return 0 when done, 1 when another iteration is needed, and a negative error | |
4680 | * code upon failure. | |
4681 | */ | |
4682 | static int | |
69a22773 | 4683 | recv_bm_rle_bits(struct drbd_peer_device *peer_device, |
b411b363 | 4684 | struct p_compressed_bm *p, |
c6d25cfe PR |
4685 | struct bm_xfer_ctx *c, |
4686 | unsigned int len) | |
b411b363 PR |
4687 | { |
4688 | struct bitstream bs; | |
4689 | u64 look_ahead; | |
4690 | u64 rl; | |
4691 | u64 tmp; | |
4692 | unsigned long s = c->bit_offset; | |
4693 | unsigned long e; | |
a02d1240 | 4694 | int toggle = dcbp_get_start(p); |
b411b363 PR |
4695 | int have; |
4696 | int bits; | |
4697 | ||
a02d1240 | 4698 | bitstream_init(&bs, p->code, len, dcbp_get_pad_bits(p)); |
b411b363 PR |
4699 | |
4700 | bits = bitstream_get_bits(&bs, &look_ahead, 64); | |
4701 | if (bits < 0) | |
2c46407d | 4702 | return -EIO; |
b411b363 PR |
4703 | |
4704 | for (have = bits; have > 0; s += rl, toggle = !toggle) { | |
4705 | bits = vli_decode_bits(&rl, look_ahead); | |
4706 | if (bits <= 0) | |
2c46407d | 4707 | return -EIO; |
b411b363 PR |
4708 | |
4709 | if (toggle) { | |
4710 | e = s + rl -1; | |
4711 | if (e >= c->bm_bits) { | |
69a22773 | 4712 | drbd_err(peer_device, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); |
2c46407d | 4713 | return -EIO; |
b411b363 | 4714 | } |
69a22773 | 4715 | _drbd_bm_set_bits(peer_device->device, s, e); |
b411b363 PR |
4716 | } |
4717 | ||
4718 | if (have < bits) { | |
69a22773 | 4719 | drbd_err(peer_device, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", |
b411b363 PR |
4720 | have, bits, look_ahead, |
4721 | (unsigned int)(bs.cur.b - p->code), | |
4722 | (unsigned int)bs.buf_len); | |
2c46407d | 4723 | return -EIO; |
b411b363 | 4724 | } |
d2da5b0c LE |
4725 | /* if we consumed all 64 bits, assign 0; >> 64 is "undefined"; */ |
4726 | if (likely(bits < 64)) | |
4727 | look_ahead >>= bits; | |
4728 | else | |
4729 | look_ahead = 0; | |
b411b363 PR |
4730 | have -= bits; |
4731 | ||
4732 | bits = bitstream_get_bits(&bs, &tmp, 64 - have); | |
4733 | if (bits < 0) | |
2c46407d | 4734 | return -EIO; |
b411b363 PR |
4735 | look_ahead |= tmp << have; |
4736 | have += bits; | |
4737 | } | |
4738 | ||
4739 | c->bit_offset = s; | |
4740 | bm_xfer_ctx_bit_to_word_offset(c); | |
4741 | ||
2c46407d | 4742 | return (s != c->bm_bits); |
b411b363 PR |
4743 | } |
4744 | ||
9b48ff07 | 4745 | /* |
2c46407d AG |
4746 | * decode_bitmap_c |
4747 | * | |
4748 | * Return 0 when done, 1 when another iteration is needed, and a negative error | |
4749 | * code upon failure. | |
4750 | */ | |
4751 | static int | |
69a22773 | 4752 | decode_bitmap_c(struct drbd_peer_device *peer_device, |
b411b363 | 4753 | struct p_compressed_bm *p, |
c6d25cfe PR |
4754 | struct bm_xfer_ctx *c, |
4755 | unsigned int len) | |
b411b363 | 4756 | { |
a02d1240 | 4757 | if (dcbp_get_code(p) == RLE_VLI_Bits) |
69a22773 | 4758 | return recv_bm_rle_bits(peer_device, p, c, len - sizeof(*p)); |
b411b363 PR |
4759 | |
4760 | /* other variants had been implemented for evaluation, | |
4761 | * but have been dropped as this one turned out to be "best" | |
4762 | * during all our tests. */ | |
4763 | ||
69a22773 AG |
4764 | drbd_err(peer_device, "receive_bitmap_c: unknown encoding %u\n", p->encoding); |
4765 | conn_request_state(peer_device->connection, NS(conn, C_PROTOCOL_ERROR), CS_HARD); | |
2c46407d | 4766 | return -EIO; |
b411b363 PR |
4767 | } |
4768 | ||
b30ab791 | 4769 | void INFO_bm_xfer_stats(struct drbd_device *device, |
b411b363 PR |
4770 | const char *direction, struct bm_xfer_ctx *c) |
4771 | { | |
4772 | /* what would it take to transfer it "plaintext" */ | |
a6b32bc3 | 4773 | unsigned int header_size = drbd_header_size(first_peer_device(device)->connection); |
50d0b1ad AG |
4774 | unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - header_size; |
4775 | unsigned int plain = | |
4776 | header_size * (DIV_ROUND_UP(c->bm_words, data_size) + 1) + | |
4777 | c->bm_words * sizeof(unsigned long); | |
4778 | unsigned int total = c->bytes[0] + c->bytes[1]; | |
4779 | unsigned int r; | |
b411b363 PR |
4780 | |
4781 | /* total can not be zero. but just in case: */ | |
4782 | if (total == 0) | |
4783 | return; | |
4784 | ||
4785 | /* don't report if not compressed */ | |
4786 | if (total >= plain) | |
4787 | return; | |
4788 | ||
4789 | /* total < plain. check for overflow, still */ | |
4790 | r = (total > UINT_MAX/1000) ? (total / (plain/1000)) | |
4791 | : (1000 * total / plain); | |
4792 | ||
4793 | if (r > 1000) | |
4794 | r = 1000; | |
4795 | ||
4796 | r = 1000 - r; | |
d0180171 | 4797 | drbd_info(device, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " |
b411b363 PR |
4798 | "total %u; compression: %u.%u%%\n", |
4799 | direction, | |
4800 | c->bytes[1], c->packets[1], | |
4801 | c->bytes[0], c->packets[0], | |
4802 | total, r/10, r % 10); | |
4803 | } | |
4804 | ||
4805 | /* Since we are processing the bitfield from lower addresses to higher, | |
4806 | it does not matter if the process it in 32 bit chunks or 64 bit | |
4807 | chunks as long as it is little endian. (Understand it as byte stream, | |
4808 | beginning with the lowest byte...) If we would use big endian | |
4809 | we would need to process it from the highest address to the lowest, | |
4810 | in order to be agnostic to the 32 vs 64 bits issue. | |
4811 | ||
4812 | returns 0 on failure, 1 if we successfully received it. */ | |
bde89a9e | 4813 | static int receive_bitmap(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 4814 | { |
9f4fe9ad | 4815 | struct drbd_peer_device *peer_device; |
b30ab791 | 4816 | struct drbd_device *device; |
b411b363 | 4817 | struct bm_xfer_ctx c; |
2c46407d | 4818 | int err; |
4a76b161 | 4819 | |
9f4fe9ad AG |
4820 | peer_device = conn_peer_device(connection, pi->vnr); |
4821 | if (!peer_device) | |
4a76b161 | 4822 | return -EIO; |
9f4fe9ad | 4823 | device = peer_device->device; |
b411b363 | 4824 | |
b30ab791 | 4825 | drbd_bm_lock(device, "receive bitmap", BM_LOCKED_SET_ALLOWED); |
20ceb2b2 LE |
4826 | /* you are supposed to send additional out-of-sync information |
4827 | * if you actually set bits during this phase */ | |
b411b363 | 4828 | |
b411b363 | 4829 | c = (struct bm_xfer_ctx) { |
b30ab791 AG |
4830 | .bm_bits = drbd_bm_bits(device), |
4831 | .bm_words = drbd_bm_words(device), | |
b411b363 PR |
4832 | }; |
4833 | ||
2c46407d | 4834 | for(;;) { |
e658983a | 4835 | if (pi->cmd == P_BITMAP) |
69a22773 | 4836 | err = receive_bitmap_plain(peer_device, pi->size, pi->data, &c); |
e658983a | 4837 | else if (pi->cmd == P_COMPRESSED_BITMAP) { |
b411b363 PR |
4838 | /* MAYBE: sanity check that we speak proto >= 90, |
4839 | * and the feature is enabled! */ | |
e658983a | 4840 | struct p_compressed_bm *p = pi->data; |
b411b363 | 4841 | |
bde89a9e | 4842 | if (pi->size > DRBD_SOCKET_BUFFER_SIZE - drbd_header_size(connection)) { |
d0180171 | 4843 | drbd_err(device, "ReportCBitmap packet too large\n"); |
82bc0194 | 4844 | err = -EIO; |
b411b363 PR |
4845 | goto out; |
4846 | } | |
e658983a | 4847 | if (pi->size <= sizeof(*p)) { |
d0180171 | 4848 | drbd_err(device, "ReportCBitmap packet too small (l:%u)\n", pi->size); |
82bc0194 | 4849 | err = -EIO; |
78fcbdae | 4850 | goto out; |
b411b363 | 4851 | } |
9f4fe9ad | 4852 | err = drbd_recv_all(peer_device->connection, p, pi->size); |
e658983a AG |
4853 | if (err) |
4854 | goto out; | |
69a22773 | 4855 | err = decode_bitmap_c(peer_device, p, &c, pi->size); |
b411b363 | 4856 | } else { |
d0180171 | 4857 | drbd_warn(device, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", pi->cmd); |
82bc0194 | 4858 | err = -EIO; |
b411b363 PR |
4859 | goto out; |
4860 | } | |
4861 | ||
e2857216 | 4862 | c.packets[pi->cmd == P_BITMAP]++; |
bde89a9e | 4863 | c.bytes[pi->cmd == P_BITMAP] += drbd_header_size(connection) + pi->size; |
b411b363 | 4864 | |
2c46407d AG |
4865 | if (err <= 0) { |
4866 | if (err < 0) | |
4867 | goto out; | |
b411b363 | 4868 | break; |
2c46407d | 4869 | } |
9f4fe9ad | 4870 | err = drbd_recv_header(peer_device->connection, pi); |
82bc0194 | 4871 | if (err) |
b411b363 | 4872 | goto out; |
2c46407d | 4873 | } |
b411b363 | 4874 | |
b30ab791 | 4875 | INFO_bm_xfer_stats(device, "receive", &c); |
b411b363 | 4876 | |
b30ab791 | 4877 | if (device->state.conn == C_WF_BITMAP_T) { |
de1f8e4a AG |
4878 | enum drbd_state_rv rv; |
4879 | ||
b30ab791 | 4880 | err = drbd_send_bitmap(device); |
82bc0194 | 4881 | if (err) |
b411b363 PR |
4882 | goto out; |
4883 | /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ | |
b30ab791 | 4884 | rv = _drbd_request_state(device, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); |
0b0ba1ef | 4885 | D_ASSERT(device, rv == SS_SUCCESS); |
b30ab791 | 4886 | } else if (device->state.conn != C_WF_BITMAP_S) { |
b411b363 PR |
4887 | /* admin may have requested C_DISCONNECTING, |
4888 | * other threads may have noticed network errors */ | |
d0180171 | 4889 | drbd_info(device, "unexpected cstate (%s) in receive_bitmap\n", |
b30ab791 | 4890 | drbd_conn_str(device->state.conn)); |
b411b363 | 4891 | } |
82bc0194 | 4892 | err = 0; |
b411b363 | 4893 | |
b411b363 | 4894 | out: |
b30ab791 AG |
4895 | drbd_bm_unlock(device); |
4896 | if (!err && device->state.conn == C_WF_BITMAP_S) | |
4897 | drbd_start_resync(device, C_SYNC_SOURCE); | |
82bc0194 | 4898 | return err; |
b411b363 PR |
4899 | } |
4900 | ||
bde89a9e | 4901 | static int receive_skip(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 4902 | { |
1ec861eb | 4903 | drbd_warn(connection, "skipping unknown optional packet type %d, l: %d!\n", |
e2857216 | 4904 | pi->cmd, pi->size); |
b411b363 | 4905 | |
bde89a9e | 4906 | return ignore_remaining_packet(connection, pi); |
b411b363 PR |
4907 | } |
4908 | ||
bde89a9e | 4909 | static int receive_UnplugRemote(struct drbd_connection *connection, struct packet_info *pi) |
0ced55a3 | 4910 | { |
e7f52dfb LE |
4911 | /* Make sure we've acked all the TCP data associated |
4912 | * with the data requests being unplugged */ | |
ddd061b8 | 4913 | tcp_sock_set_quickack(connection->data.socket->sk, 2); |
82bc0194 | 4914 | return 0; |
0ced55a3 PR |
4915 | } |
4916 | ||
bde89a9e | 4917 | static int receive_out_of_sync(struct drbd_connection *connection, struct packet_info *pi) |
73a01a18 | 4918 | { |
9f4fe9ad | 4919 | struct drbd_peer_device *peer_device; |
b30ab791 | 4920 | struct drbd_device *device; |
e658983a | 4921 | struct p_block_desc *p = pi->data; |
4a76b161 | 4922 | |
9f4fe9ad AG |
4923 | peer_device = conn_peer_device(connection, pi->vnr); |
4924 | if (!peer_device) | |
4a76b161 | 4925 | return -EIO; |
9f4fe9ad | 4926 | device = peer_device->device; |
73a01a18 | 4927 | |
b30ab791 | 4928 | switch (device->state.conn) { |
f735e363 LE |
4929 | case C_WF_SYNC_UUID: |
4930 | case C_WF_BITMAP_T: | |
4931 | case C_BEHIND: | |
4932 | break; | |
4933 | default: | |
d0180171 | 4934 | drbd_err(device, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n", |
b30ab791 | 4935 | drbd_conn_str(device->state.conn)); |
f735e363 LE |
4936 | } |
4937 | ||
b30ab791 | 4938 | drbd_set_out_of_sync(device, be64_to_cpu(p->sector), be32_to_cpu(p->blksize)); |
73a01a18 | 4939 | |
82bc0194 | 4940 | return 0; |
73a01a18 PR |
4941 | } |
4942 | ||
700ca8c0 PR |
4943 | static int receive_rs_deallocated(struct drbd_connection *connection, struct packet_info *pi) |
4944 | { | |
4945 | struct drbd_peer_device *peer_device; | |
4946 | struct p_block_desc *p = pi->data; | |
4947 | struct drbd_device *device; | |
4948 | sector_t sector; | |
4949 | int size, err = 0; | |
4950 | ||
4951 | peer_device = conn_peer_device(connection, pi->vnr); | |
4952 | if (!peer_device) | |
4953 | return -EIO; | |
4954 | device = peer_device->device; | |
4955 | ||
4956 | sector = be64_to_cpu(p->sector); | |
4957 | size = be32_to_cpu(p->blksize); | |
4958 | ||
4959 | dec_rs_pending(device); | |
4960 | ||
4961 | if (get_ldev(device)) { | |
4962 | struct drbd_peer_request *peer_req; | |
700ca8c0 PR |
4963 | |
4964 | peer_req = drbd_alloc_peer_req(peer_device, ID_SYNCER, sector, | |
9104d31a | 4965 | size, 0, GFP_NOIO); |
700ca8c0 PR |
4966 | if (!peer_req) { |
4967 | put_ldev(device); | |
4968 | return -ENOMEM; | |
4969 | } | |
4970 | ||
4971 | peer_req->w.cb = e_end_resync_block; | |
ce668b6d | 4972 | peer_req->opf = REQ_OP_DISCARD; |
700ca8c0 | 4973 | peer_req->submit_jif = jiffies; |
f31e583a | 4974 | peer_req->flags |= EE_TRIM; |
700ca8c0 PR |
4975 | |
4976 | spin_lock_irq(&device->resource->req_lock); | |
4977 | list_add_tail(&peer_req->w.list, &device->sync_ee); | |
4978 | spin_unlock_irq(&device->resource->req_lock); | |
4979 | ||
4980 | atomic_add(pi->size >> 9, &device->rs_sect_ev); | |
ce668b6d | 4981 | err = drbd_submit_peer_request(peer_req); |
700ca8c0 PR |
4982 | |
4983 | if (err) { | |
4984 | spin_lock_irq(&device->resource->req_lock); | |
4985 | list_del(&peer_req->w.list); | |
4986 | spin_unlock_irq(&device->resource->req_lock); | |
4987 | ||
4988 | drbd_free_peer_req(device, peer_req); | |
4989 | put_ldev(device); | |
4990 | err = 0; | |
4991 | goto fail; | |
4992 | } | |
4993 | ||
4994 | inc_unacked(device); | |
4995 | ||
4996 | /* No put_ldev() here. Gets called in drbd_endio_write_sec_final(), | |
4997 | as well as drbd_rs_complete_io() */ | |
4998 | } else { | |
4999 | fail: | |
5000 | drbd_rs_complete_io(device, sector); | |
5001 | drbd_send_ack_ex(peer_device, P_NEG_ACK, sector, size, ID_SYNCER); | |
5002 | } | |
5003 | ||
5004 | atomic_add(size >> 9, &device->rs_sect_in); | |
5005 | ||
5006 | return err; | |
5007 | } | |
5008 | ||
02918be2 PR |
5009 | struct data_cmd { |
5010 | int expect_payload; | |
9104d31a | 5011 | unsigned int pkt_size; |
bde89a9e | 5012 | int (*fn)(struct drbd_connection *, struct packet_info *); |
02918be2 PR |
5013 | }; |
5014 | ||
5015 | static struct data_cmd drbd_cmd_handler[] = { | |
5016 | [P_DATA] = { 1, sizeof(struct p_data), receive_Data }, | |
5017 | [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply }, | |
5018 | [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } , | |
5019 | [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } , | |
e658983a AG |
5020 | [P_BITMAP] = { 1, 0, receive_bitmap } , |
5021 | [P_COMPRESSED_BITMAP] = { 1, 0, receive_bitmap } , | |
5022 | [P_UNPLUG_REMOTE] = { 0, 0, receive_UnplugRemote }, | |
02918be2 PR |
5023 | [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, |
5024 | [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, | |
e658983a AG |
5025 | [P_SYNC_PARAM] = { 1, 0, receive_SyncParam }, |
5026 | [P_SYNC_PARAM89] = { 1, 0, receive_SyncParam }, | |
02918be2 PR |
5027 | [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol }, |
5028 | [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids }, | |
5029 | [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes }, | |
5030 | [P_STATE] = { 0, sizeof(struct p_state), receive_state }, | |
5031 | [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state }, | |
5032 | [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid }, | |
5033 | [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, | |
5034 | [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest }, | |
5035 | [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest }, | |
700ca8c0 | 5036 | [P_RS_THIN_REQ] = { 0, sizeof(struct p_block_req), receive_DataRequest }, |
02918be2 | 5037 | [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip }, |
73a01a18 | 5038 | [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync }, |
4a76b161 | 5039 | [P_CONN_ST_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_conn_state }, |
036b17ea | 5040 | [P_PROTOCOL_UPDATE] = { 1, sizeof(struct p_protocol), receive_protocol }, |
a0fb3c47 | 5041 | [P_TRIM] = { 0, sizeof(struct p_trim), receive_Data }, |
f31e583a | 5042 | [P_ZEROES] = { 0, sizeof(struct p_trim), receive_Data }, |
700ca8c0 | 5043 | [P_RS_DEALLOCATED] = { 0, sizeof(struct p_block_desc), receive_rs_deallocated }, |
b411b363 PR |
5044 | }; |
5045 | ||
bde89a9e | 5046 | static void drbdd(struct drbd_connection *connection) |
b411b363 | 5047 | { |
77351055 | 5048 | struct packet_info pi; |
02918be2 | 5049 | size_t shs; /* sub header size */ |
82bc0194 | 5050 | int err; |
b411b363 | 5051 | |
bde89a9e | 5052 | while (get_t_state(&connection->receiver) == RUNNING) { |
9104d31a | 5053 | struct data_cmd const *cmd; |
b411b363 | 5054 | |
bde89a9e | 5055 | drbd_thread_current_set_cpu(&connection->receiver); |
c51a0ef3 LE |
5056 | update_receiver_timing_details(connection, drbd_recv_header_maybe_unplug); |
5057 | if (drbd_recv_header_maybe_unplug(connection, &pi)) | |
02918be2 | 5058 | goto err_out; |
b411b363 | 5059 | |
deebe195 | 5060 | cmd = &drbd_cmd_handler[pi.cmd]; |
4a76b161 | 5061 | if (unlikely(pi.cmd >= ARRAY_SIZE(drbd_cmd_handler) || !cmd->fn)) { |
1ec861eb | 5062 | drbd_err(connection, "Unexpected data packet %s (0x%04x)", |
2fcb8f30 | 5063 | cmdname(pi.cmd), pi.cmd); |
02918be2 | 5064 | goto err_out; |
0b33a916 | 5065 | } |
b411b363 | 5066 | |
e658983a | 5067 | shs = cmd->pkt_size; |
9104d31a LE |
5068 | if (pi.cmd == P_SIZES && connection->agreed_features & DRBD_FF_WSAME) |
5069 | shs += sizeof(struct o_qlim); | |
e658983a | 5070 | if (pi.size > shs && !cmd->expect_payload) { |
1ec861eb | 5071 | drbd_err(connection, "No payload expected %s l:%d\n", |
2fcb8f30 | 5072 | cmdname(pi.cmd), pi.size); |
02918be2 | 5073 | goto err_out; |
b411b363 | 5074 | } |
9104d31a LE |
5075 | if (pi.size < shs) { |
5076 | drbd_err(connection, "%s: unexpected packet size, expected:%d received:%d\n", | |
5077 | cmdname(pi.cmd), (int)shs, pi.size); | |
5078 | goto err_out; | |
5079 | } | |
b411b363 | 5080 | |
c13f7e1a | 5081 | if (shs) { |
944410e9 | 5082 | update_receiver_timing_details(connection, drbd_recv_all_warn); |
bde89a9e | 5083 | err = drbd_recv_all_warn(connection, pi.data, shs); |
a5c31904 | 5084 | if (err) |
c13f7e1a | 5085 | goto err_out; |
e2857216 | 5086 | pi.size -= shs; |
c13f7e1a LE |
5087 | } |
5088 | ||
944410e9 | 5089 | update_receiver_timing_details(connection, cmd->fn); |
bde89a9e | 5090 | err = cmd->fn(connection, &pi); |
4a76b161 | 5091 | if (err) { |
1ec861eb | 5092 | drbd_err(connection, "error receiving %s, e: %d l: %d!\n", |
9f5bdc33 | 5093 | cmdname(pi.cmd), err, pi.size); |
02918be2 | 5094 | goto err_out; |
b411b363 PR |
5095 | } |
5096 | } | |
82bc0194 | 5097 | return; |
b411b363 | 5098 | |
82bc0194 | 5099 | err_out: |
bde89a9e | 5100 | conn_request_state(connection, NS(conn, C_PROTOCOL_ERROR), CS_HARD); |
b411b363 PR |
5101 | } |
5102 | ||
bde89a9e | 5103 | static void conn_disconnect(struct drbd_connection *connection) |
b411b363 | 5104 | { |
c06ece6b | 5105 | struct drbd_peer_device *peer_device; |
bbeb641c | 5106 | enum drbd_conns oc; |
376694a0 | 5107 | int vnr; |
b411b363 | 5108 | |
bde89a9e | 5109 | if (connection->cstate == C_STANDALONE) |
b411b363 | 5110 | return; |
b411b363 | 5111 | |
545752d5 LE |
5112 | /* We are about to start the cleanup after connection loss. |
5113 | * Make sure drbd_make_request knows about that. | |
5114 | * Usually we should be in some network failure state already, | |
5115 | * but just in case we are not, we fix it up here. | |
5116 | */ | |
bde89a9e | 5117 | conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD); |
545752d5 | 5118 | |
668700b4 | 5119 | /* ack_receiver does not clean up anything. it must not interfere, either */ |
1c03e520 | 5120 | drbd_thread_stop(&connection->ack_receiver); |
668700b4 PR |
5121 | if (connection->ack_sender) { |
5122 | destroy_workqueue(connection->ack_sender); | |
5123 | connection->ack_sender = NULL; | |
5124 | } | |
bde89a9e | 5125 | drbd_free_sock(connection); |
360cc740 | 5126 | |
c141ebda | 5127 | rcu_read_lock(); |
c06ece6b AG |
5128 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
5129 | struct drbd_device *device = peer_device->device; | |
b30ab791 | 5130 | kref_get(&device->kref); |
c141ebda | 5131 | rcu_read_unlock(); |
69a22773 | 5132 | drbd_disconnected(peer_device); |
c06ece6b | 5133 | kref_put(&device->kref, drbd_destroy_device); |
c141ebda PR |
5134 | rcu_read_lock(); |
5135 | } | |
5136 | rcu_read_unlock(); | |
5137 | ||
bde89a9e | 5138 | if (!list_empty(&connection->current_epoch->list)) |
1ec861eb | 5139 | drbd_err(connection, "ASSERTION FAILED: connection->current_epoch->list not empty\n"); |
12038a3a | 5140 | /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ |
bde89a9e AG |
5141 | atomic_set(&connection->current_epoch->epoch_size, 0); |
5142 | connection->send.seen_any_write_yet = false; | |
12038a3a | 5143 | |
1ec861eb | 5144 | drbd_info(connection, "Connection closed\n"); |
360cc740 | 5145 | |
bde89a9e AG |
5146 | if (conn_highest_role(connection) == R_PRIMARY && conn_highest_pdsk(connection) >= D_UNKNOWN) |
5147 | conn_try_outdate_peer_async(connection); | |
cb703454 | 5148 | |
0500813f | 5149 | spin_lock_irq(&connection->resource->req_lock); |
bde89a9e | 5150 | oc = connection->cstate; |
bbeb641c | 5151 | if (oc >= C_UNCONNECTED) |
bde89a9e | 5152 | _conn_request_state(connection, NS(conn, C_UNCONNECTED), CS_VERBOSE); |
bbeb641c | 5153 | |
0500813f | 5154 | spin_unlock_irq(&connection->resource->req_lock); |
360cc740 | 5155 | |
f3dfa40a | 5156 | if (oc == C_DISCONNECTING) |
bde89a9e | 5157 | conn_request_state(connection, NS(conn, C_STANDALONE), CS_VERBOSE | CS_HARD); |
360cc740 PR |
5158 | } |
5159 | ||
69a22773 | 5160 | static int drbd_disconnected(struct drbd_peer_device *peer_device) |
360cc740 | 5161 | { |
69a22773 | 5162 | struct drbd_device *device = peer_device->device; |
360cc740 | 5163 | unsigned int i; |
b411b363 | 5164 | |
85719573 | 5165 | /* wait for current activity to cease. */ |
0500813f | 5166 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 AG |
5167 | _drbd_wait_ee_list_empty(device, &device->active_ee); |
5168 | _drbd_wait_ee_list_empty(device, &device->sync_ee); | |
5169 | _drbd_wait_ee_list_empty(device, &device->read_ee); | |
0500813f | 5170 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 PR |
5171 | |
5172 | /* We do not have data structures that would allow us to | |
5173 | * get the rs_pending_cnt down to 0 again. | |
5174 | * * On C_SYNC_TARGET we do not have any data structures describing | |
5175 | * the pending RSDataRequest's we have sent. | |
5176 | * * On C_SYNC_SOURCE there is no data structure that tracks | |
5177 | * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. | |
5178 | * And no, it is not the sum of the reference counts in the | |
5179 | * resync_LRU. The resync_LRU tracks the whole operation including | |
5180 | * the disk-IO, while the rs_pending_cnt only tracks the blocks | |
5181 | * on the fly. */ | |
b30ab791 AG |
5182 | drbd_rs_cancel_all(device); |
5183 | device->rs_total = 0; | |
5184 | device->rs_failed = 0; | |
5185 | atomic_set(&device->rs_pending_cnt, 0); | |
5186 | wake_up(&device->misc_wait); | |
b411b363 | 5187 | |
b30ab791 | 5188 | del_timer_sync(&device->resync_timer); |
2bccef39 | 5189 | resync_timer_fn(&device->resync_timer); |
b411b363 | 5190 | |
b411b363 PR |
5191 | /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, |
5192 | * w_make_resync_request etc. which may still be on the worker queue | |
5193 | * to be "canceled" */ | |
b5043c5e | 5194 | drbd_flush_workqueue(&peer_device->connection->sender_work); |
b411b363 | 5195 | |
b30ab791 | 5196 | drbd_finish_peer_reqs(device); |
b411b363 | 5197 | |
d10b4ea3 PR |
5198 | /* This second workqueue flush is necessary, since drbd_finish_peer_reqs() |
5199 | might have issued a work again. The one before drbd_finish_peer_reqs() is | |
5200 | necessary to reclain net_ee in drbd_finish_peer_reqs(). */ | |
b5043c5e | 5201 | drbd_flush_workqueue(&peer_device->connection->sender_work); |
d10b4ea3 | 5202 | |
08332d73 LE |
5203 | /* need to do it again, drbd_finish_peer_reqs() may have populated it |
5204 | * again via drbd_try_clear_on_disk_bm(). */ | |
b30ab791 | 5205 | drbd_rs_cancel_all(device); |
b411b363 | 5206 | |
b30ab791 AG |
5207 | kfree(device->p_uuid); |
5208 | device->p_uuid = NULL; | |
b411b363 | 5209 | |
b30ab791 | 5210 | if (!drbd_suspended(device)) |
69a22773 | 5211 | tl_clear(peer_device->connection); |
b411b363 | 5212 | |
b30ab791 | 5213 | drbd_md_sync(device); |
b411b363 | 5214 | |
be115b69 LE |
5215 | if (get_ldev(device)) { |
5216 | drbd_bitmap_io(device, &drbd_bm_write_copy_pages, | |
5217 | "write from disconnected", BM_LOCKED_CHANGE_ALLOWED); | |
5218 | put_ldev(device); | |
5219 | } | |
20ceb2b2 | 5220 | |
b411b363 PR |
5221 | /* tcp_close and release of sendpage pages can be deferred. I don't |
5222 | * want to use SO_LINGER, because apparently it can be deferred for | |
5223 | * more than 20 seconds (longest time I checked). | |
5224 | * | |
5225 | * Actually we don't care for exactly when the network stack does its | |
5226 | * put_page(), but release our reference on these pages right here. | |
5227 | */ | |
b30ab791 | 5228 | i = drbd_free_peer_reqs(device, &device->net_ee); |
b411b363 | 5229 | if (i) |
d0180171 | 5230 | drbd_info(device, "net_ee not empty, killed %u entries\n", i); |
b30ab791 | 5231 | i = atomic_read(&device->pp_in_use_by_net); |
435f0740 | 5232 | if (i) |
d0180171 | 5233 | drbd_info(device, "pp_in_use_by_net = %d, expected 0\n", i); |
b30ab791 | 5234 | i = atomic_read(&device->pp_in_use); |
b411b363 | 5235 | if (i) |
d0180171 | 5236 | drbd_info(device, "pp_in_use = %d, expected 0\n", i); |
b411b363 | 5237 | |
0b0ba1ef AG |
5238 | D_ASSERT(device, list_empty(&device->read_ee)); |
5239 | D_ASSERT(device, list_empty(&device->active_ee)); | |
5240 | D_ASSERT(device, list_empty(&device->sync_ee)); | |
5241 | D_ASSERT(device, list_empty(&device->done_ee)); | |
b411b363 | 5242 | |
360cc740 | 5243 | return 0; |
b411b363 PR |
5244 | } |
5245 | ||
5246 | /* | |
5247 | * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version | |
5248 | * we can agree on is stored in agreed_pro_version. | |
5249 | * | |
5250 | * feature flags and the reserved array should be enough room for future | |
5251 | * enhancements of the handshake protocol, and possible plugins... | |
5252 | * | |
5253 | * for now, they are expected to be zero, but ignored. | |
5254 | */ | |
bde89a9e | 5255 | static int drbd_send_features(struct drbd_connection *connection) |
b411b363 | 5256 | { |
9f5bdc33 AG |
5257 | struct drbd_socket *sock; |
5258 | struct p_connection_features *p; | |
b411b363 | 5259 | |
bde89a9e AG |
5260 | sock = &connection->data; |
5261 | p = conn_prepare_command(connection, sock); | |
9f5bdc33 | 5262 | if (!p) |
e8d17b01 | 5263 | return -EIO; |
b411b363 PR |
5264 | memset(p, 0, sizeof(*p)); |
5265 | p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); | |
5266 | p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); | |
20c68fde | 5267 | p->feature_flags = cpu_to_be32(PRO_FEATURES); |
bde89a9e | 5268 | return conn_send_command(connection, sock, P_CONNECTION_FEATURES, sizeof(*p), NULL, 0); |
b411b363 PR |
5269 | } |
5270 | ||
5271 | /* | |
5272 | * return values: | |
5273 | * 1 yes, we have a valid connection | |
5274 | * 0 oops, did not work out, please try again | |
5275 | * -1 peer talks different language, | |
5276 | * no point in trying again, please go standalone. | |
5277 | */ | |
bde89a9e | 5278 | static int drbd_do_features(struct drbd_connection *connection) |
b411b363 | 5279 | { |
bde89a9e | 5280 | /* ASSERT current == connection->receiver ... */ |
e658983a AG |
5281 | struct p_connection_features *p; |
5282 | const int expect = sizeof(struct p_connection_features); | |
77351055 | 5283 | struct packet_info pi; |
a5c31904 | 5284 | int err; |
b411b363 | 5285 | |
bde89a9e | 5286 | err = drbd_send_features(connection); |
e8d17b01 | 5287 | if (err) |
b411b363 PR |
5288 | return 0; |
5289 | ||
bde89a9e | 5290 | err = drbd_recv_header(connection, &pi); |
69bc7bc3 | 5291 | if (err) |
b411b363 PR |
5292 | return 0; |
5293 | ||
6038178e | 5294 | if (pi.cmd != P_CONNECTION_FEATURES) { |
1ec861eb | 5295 | drbd_err(connection, "expected ConnectionFeatures packet, received: %s (0x%04x)\n", |
2fcb8f30 | 5296 | cmdname(pi.cmd), pi.cmd); |
b411b363 PR |
5297 | return -1; |
5298 | } | |
5299 | ||
77351055 | 5300 | if (pi.size != expect) { |
1ec861eb | 5301 | drbd_err(connection, "expected ConnectionFeatures length: %u, received: %u\n", |
77351055 | 5302 | expect, pi.size); |
b411b363 PR |
5303 | return -1; |
5304 | } | |
5305 | ||
e658983a | 5306 | p = pi.data; |
bde89a9e | 5307 | err = drbd_recv_all_warn(connection, p, expect); |
a5c31904 | 5308 | if (err) |
b411b363 | 5309 | return 0; |
b411b363 | 5310 | |
b411b363 PR |
5311 | p->protocol_min = be32_to_cpu(p->protocol_min); |
5312 | p->protocol_max = be32_to_cpu(p->protocol_max); | |
5313 | if (p->protocol_max == 0) | |
5314 | p->protocol_max = p->protocol_min; | |
5315 | ||
5316 | if (PRO_VERSION_MAX < p->protocol_min || | |
5317 | PRO_VERSION_MIN > p->protocol_max) | |
5318 | goto incompat; | |
5319 | ||
bde89a9e | 5320 | connection->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); |
20c68fde | 5321 | connection->agreed_features = PRO_FEATURES & be32_to_cpu(p->feature_flags); |
b411b363 | 5322 | |
1ec861eb | 5323 | drbd_info(connection, "Handshake successful: " |
bde89a9e | 5324 | "Agreed network protocol version %d\n", connection->agreed_pro_version); |
b411b363 | 5325 | |
f31e583a | 5326 | drbd_info(connection, "Feature flags enabled on protocol level: 0x%x%s%s%s%s.\n", |
9104d31a LE |
5327 | connection->agreed_features, |
5328 | connection->agreed_features & DRBD_FF_TRIM ? " TRIM" : "", | |
5329 | connection->agreed_features & DRBD_FF_THIN_RESYNC ? " THIN_RESYNC" : "", | |
f31e583a LE |
5330 | connection->agreed_features & DRBD_FF_WSAME ? " WRITE_SAME" : "", |
5331 | connection->agreed_features & DRBD_FF_WZEROES ? " WRITE_ZEROES" : | |
9104d31a | 5332 | connection->agreed_features ? "" : " none"); |
92d94ae6 | 5333 | |
b411b363 PR |
5334 | return 1; |
5335 | ||
5336 | incompat: | |
1ec861eb | 5337 | drbd_err(connection, "incompatible DRBD dialects: " |
b411b363 PR |
5338 | "I support %d-%d, peer supports %d-%d\n", |
5339 | PRO_VERSION_MIN, PRO_VERSION_MAX, | |
5340 | p->protocol_min, p->protocol_max); | |
5341 | return -1; | |
5342 | } | |
5343 | ||
5344 | #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) | |
bde89a9e | 5345 | static int drbd_do_auth(struct drbd_connection *connection) |
b411b363 | 5346 | { |
1ec861eb AG |
5347 | drbd_err(connection, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); |
5348 | drbd_err(connection, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); | |
b10d96cb | 5349 | return -1; |
b411b363 PR |
5350 | } |
5351 | #else | |
5352 | #define CHALLENGE_LEN 64 | |
b10d96cb JT |
5353 | |
5354 | /* Return value: | |
5355 | 1 - auth succeeded, | |
5356 | 0 - failed, try again (network error), | |
5357 | -1 - auth failed, don't try again. | |
5358 | */ | |
5359 | ||
bde89a9e | 5360 | static int drbd_do_auth(struct drbd_connection *connection) |
b411b363 | 5361 | { |
9f5bdc33 | 5362 | struct drbd_socket *sock; |
b411b363 | 5363 | char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ |
b411b363 PR |
5364 | char *response = NULL; |
5365 | char *right_response = NULL; | |
5366 | char *peers_ch = NULL; | |
44ed167d PR |
5367 | unsigned int key_len; |
5368 | char secret[SHARED_SECRET_MAX]; /* 64 byte */ | |
b411b363 | 5369 | unsigned int resp_size; |
77ce56e2 | 5370 | struct shash_desc *desc; |
77351055 | 5371 | struct packet_info pi; |
44ed167d | 5372 | struct net_conf *nc; |
69bc7bc3 | 5373 | int err, rv; |
b411b363 | 5374 | |
9f5bdc33 | 5375 | /* FIXME: Put the challenge/response into the preallocated socket buffer. */ |
b411b363 | 5376 | |
44ed167d | 5377 | rcu_read_lock(); |
bde89a9e | 5378 | nc = rcu_dereference(connection->net_conf); |
44ed167d PR |
5379 | key_len = strlen(nc->shared_secret); |
5380 | memcpy(secret, nc->shared_secret, key_len); | |
5381 | rcu_read_unlock(); | |
5382 | ||
77ce56e2 AB |
5383 | desc = kmalloc(sizeof(struct shash_desc) + |
5384 | crypto_shash_descsize(connection->cram_hmac_tfm), | |
5385 | GFP_KERNEL); | |
5386 | if (!desc) { | |
5387 | rv = -1; | |
5388 | goto fail; | |
5389 | } | |
9534d671 | 5390 | desc->tfm = connection->cram_hmac_tfm; |
b411b363 | 5391 | |
9534d671 | 5392 | rv = crypto_shash_setkey(connection->cram_hmac_tfm, (u8 *)secret, key_len); |
b411b363 | 5393 | if (rv) { |
9534d671 | 5394 | drbd_err(connection, "crypto_shash_setkey() failed with %d\n", rv); |
b10d96cb | 5395 | rv = -1; |
b411b363 PR |
5396 | goto fail; |
5397 | } | |
5398 | ||
5399 | get_random_bytes(my_challenge, CHALLENGE_LEN); | |
5400 | ||
bde89a9e AG |
5401 | sock = &connection->data; |
5402 | if (!conn_prepare_command(connection, sock)) { | |
9f5bdc33 AG |
5403 | rv = 0; |
5404 | goto fail; | |
5405 | } | |
bde89a9e | 5406 | rv = !conn_send_command(connection, sock, P_AUTH_CHALLENGE, 0, |
9f5bdc33 | 5407 | my_challenge, CHALLENGE_LEN); |
b411b363 PR |
5408 | if (!rv) |
5409 | goto fail; | |
5410 | ||
bde89a9e | 5411 | err = drbd_recv_header(connection, &pi); |
69bc7bc3 AG |
5412 | if (err) { |
5413 | rv = 0; | |
b411b363 | 5414 | goto fail; |
69bc7bc3 | 5415 | } |
b411b363 | 5416 | |
77351055 | 5417 | if (pi.cmd != P_AUTH_CHALLENGE) { |
1ec861eb | 5418 | drbd_err(connection, "expected AuthChallenge packet, received: %s (0x%04x)\n", |
2fcb8f30 | 5419 | cmdname(pi.cmd), pi.cmd); |
9049ccd4 | 5420 | rv = -1; |
b411b363 PR |
5421 | goto fail; |
5422 | } | |
5423 | ||
77351055 | 5424 | if (pi.size > CHALLENGE_LEN * 2) { |
1ec861eb | 5425 | drbd_err(connection, "expected AuthChallenge payload too big.\n"); |
b10d96cb | 5426 | rv = -1; |
b411b363 PR |
5427 | goto fail; |
5428 | } | |
5429 | ||
67cca286 PR |
5430 | if (pi.size < CHALLENGE_LEN) { |
5431 | drbd_err(connection, "AuthChallenge payload too small.\n"); | |
5432 | rv = -1; | |
5433 | goto fail; | |
5434 | } | |
5435 | ||
77351055 | 5436 | peers_ch = kmalloc(pi.size, GFP_NOIO); |
8404e191 | 5437 | if (!peers_ch) { |
b10d96cb | 5438 | rv = -1; |
b411b363 PR |
5439 | goto fail; |
5440 | } | |
5441 | ||
bde89a9e | 5442 | err = drbd_recv_all_warn(connection, peers_ch, pi.size); |
a5c31904 | 5443 | if (err) { |
b411b363 PR |
5444 | rv = 0; |
5445 | goto fail; | |
5446 | } | |
5447 | ||
67cca286 PR |
5448 | if (!memcmp(my_challenge, peers_ch, CHALLENGE_LEN)) { |
5449 | drbd_err(connection, "Peer presented the same challenge!\n"); | |
5450 | rv = -1; | |
5451 | goto fail; | |
5452 | } | |
5453 | ||
9534d671 | 5454 | resp_size = crypto_shash_digestsize(connection->cram_hmac_tfm); |
b411b363 | 5455 | response = kmalloc(resp_size, GFP_NOIO); |
8404e191 | 5456 | if (!response) { |
b10d96cb | 5457 | rv = -1; |
b411b363 PR |
5458 | goto fail; |
5459 | } | |
5460 | ||
9534d671 | 5461 | rv = crypto_shash_digest(desc, peers_ch, pi.size, response); |
b411b363 | 5462 | if (rv) { |
1ec861eb | 5463 | drbd_err(connection, "crypto_hash_digest() failed with %d\n", rv); |
b10d96cb | 5464 | rv = -1; |
b411b363 PR |
5465 | goto fail; |
5466 | } | |
5467 | ||
bde89a9e | 5468 | if (!conn_prepare_command(connection, sock)) { |
9f5bdc33 | 5469 | rv = 0; |
b411b363 | 5470 | goto fail; |
9f5bdc33 | 5471 | } |
bde89a9e | 5472 | rv = !conn_send_command(connection, sock, P_AUTH_RESPONSE, 0, |
9f5bdc33 | 5473 | response, resp_size); |
b411b363 PR |
5474 | if (!rv) |
5475 | goto fail; | |
5476 | ||
bde89a9e | 5477 | err = drbd_recv_header(connection, &pi); |
69bc7bc3 | 5478 | if (err) { |
b411b363 PR |
5479 | rv = 0; |
5480 | goto fail; | |
5481 | } | |
5482 | ||
77351055 | 5483 | if (pi.cmd != P_AUTH_RESPONSE) { |
1ec861eb | 5484 | drbd_err(connection, "expected AuthResponse packet, received: %s (0x%04x)\n", |
2fcb8f30 | 5485 | cmdname(pi.cmd), pi.cmd); |
b411b363 PR |
5486 | rv = 0; |
5487 | goto fail; | |
5488 | } | |
5489 | ||
77351055 | 5490 | if (pi.size != resp_size) { |
1ec861eb | 5491 | drbd_err(connection, "expected AuthResponse payload of wrong size\n"); |
b411b363 PR |
5492 | rv = 0; |
5493 | goto fail; | |
5494 | } | |
b411b363 | 5495 | |
bde89a9e | 5496 | err = drbd_recv_all_warn(connection, response , resp_size); |
a5c31904 | 5497 | if (err) { |
b411b363 PR |
5498 | rv = 0; |
5499 | goto fail; | |
5500 | } | |
5501 | ||
5502 | right_response = kmalloc(resp_size, GFP_NOIO); | |
8404e191 | 5503 | if (!right_response) { |
b10d96cb | 5504 | rv = -1; |
b411b363 PR |
5505 | goto fail; |
5506 | } | |
5507 | ||
9534d671 HX |
5508 | rv = crypto_shash_digest(desc, my_challenge, CHALLENGE_LEN, |
5509 | right_response); | |
b411b363 | 5510 | if (rv) { |
1ec861eb | 5511 | drbd_err(connection, "crypto_hash_digest() failed with %d\n", rv); |
b10d96cb | 5512 | rv = -1; |
b411b363 PR |
5513 | goto fail; |
5514 | } | |
5515 | ||
5516 | rv = !memcmp(response, right_response, resp_size); | |
5517 | ||
5518 | if (rv) | |
1ec861eb | 5519 | drbd_info(connection, "Peer authenticated using %d bytes HMAC\n", |
44ed167d | 5520 | resp_size); |
b10d96cb JT |
5521 | else |
5522 | rv = -1; | |
b411b363 PR |
5523 | |
5524 | fail: | |
5525 | kfree(peers_ch); | |
5526 | kfree(response); | |
5527 | kfree(right_response); | |
77ce56e2 AB |
5528 | if (desc) { |
5529 | shash_desc_zero(desc); | |
5530 | kfree(desc); | |
5531 | } | |
b411b363 PR |
5532 | |
5533 | return rv; | |
5534 | } | |
5535 | #endif | |
5536 | ||
8fe60551 | 5537 | int drbd_receiver(struct drbd_thread *thi) |
b411b363 | 5538 | { |
bde89a9e | 5539 | struct drbd_connection *connection = thi->connection; |
b411b363 PR |
5540 | int h; |
5541 | ||
1ec861eb | 5542 | drbd_info(connection, "receiver (re)started\n"); |
b411b363 PR |
5543 | |
5544 | do { | |
bde89a9e | 5545 | h = conn_connect(connection); |
b411b363 | 5546 | if (h == 0) { |
bde89a9e | 5547 | conn_disconnect(connection); |
20ee6390 | 5548 | schedule_timeout_interruptible(HZ); |
b411b363 PR |
5549 | } |
5550 | if (h == -1) { | |
1ec861eb | 5551 | drbd_warn(connection, "Discarding network configuration.\n"); |
bde89a9e | 5552 | conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 PR |
5553 | } |
5554 | } while (h == 0); | |
5555 | ||
c51a0ef3 LE |
5556 | if (h > 0) { |
5557 | blk_start_plug(&connection->receiver_plug); | |
bde89a9e | 5558 | drbdd(connection); |
c51a0ef3 LE |
5559 | blk_finish_plug(&connection->receiver_plug); |
5560 | } | |
b411b363 | 5561 | |
bde89a9e | 5562 | conn_disconnect(connection); |
b411b363 | 5563 | |
1ec861eb | 5564 | drbd_info(connection, "receiver terminated\n"); |
b411b363 PR |
5565 | return 0; |
5566 | } | |
5567 | ||
5568 | /* ********* acknowledge sender ******** */ | |
5569 | ||
bde89a9e | 5570 | static int got_conn_RqSReply(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5571 | { |
e658983a | 5572 | struct p_req_state_reply *p = pi->data; |
e4f78ede PR |
5573 | int retcode = be32_to_cpu(p->retcode); |
5574 | ||
5575 | if (retcode >= SS_SUCCESS) { | |
bde89a9e | 5576 | set_bit(CONN_WD_ST_CHG_OKAY, &connection->flags); |
e4f78ede | 5577 | } else { |
bde89a9e | 5578 | set_bit(CONN_WD_ST_CHG_FAIL, &connection->flags); |
1ec861eb | 5579 | drbd_err(connection, "Requested state change failed by peer: %s (%d)\n", |
e4f78ede PR |
5580 | drbd_set_st_err_str(retcode), retcode); |
5581 | } | |
bde89a9e | 5582 | wake_up(&connection->ping_wait); |
e4f78ede | 5583 | |
2735a594 | 5584 | return 0; |
e4f78ede | 5585 | } |
b411b363 | 5586 | |
bde89a9e | 5587 | static int got_RqSReply(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5588 | { |
9f4fe9ad | 5589 | struct drbd_peer_device *peer_device; |
b30ab791 | 5590 | struct drbd_device *device; |
e658983a | 5591 | struct p_req_state_reply *p = pi->data; |
b411b363 PR |
5592 | int retcode = be32_to_cpu(p->retcode); |
5593 | ||
9f4fe9ad AG |
5594 | peer_device = conn_peer_device(connection, pi->vnr); |
5595 | if (!peer_device) | |
2735a594 | 5596 | return -EIO; |
9f4fe9ad | 5597 | device = peer_device->device; |
1952e916 | 5598 | |
bde89a9e | 5599 | if (test_bit(CONN_WD_ST_CHG_REQ, &connection->flags)) { |
0b0ba1ef | 5600 | D_ASSERT(device, connection->agreed_pro_version < 100); |
bde89a9e | 5601 | return got_conn_RqSReply(connection, pi); |
4d0fc3fd PR |
5602 | } |
5603 | ||
b411b363 | 5604 | if (retcode >= SS_SUCCESS) { |
b30ab791 | 5605 | set_bit(CL_ST_CHG_SUCCESS, &device->flags); |
b411b363 | 5606 | } else { |
b30ab791 | 5607 | set_bit(CL_ST_CHG_FAIL, &device->flags); |
d0180171 | 5608 | drbd_err(device, "Requested state change failed by peer: %s (%d)\n", |
e4f78ede | 5609 | drbd_set_st_err_str(retcode), retcode); |
b411b363 | 5610 | } |
b30ab791 | 5611 | wake_up(&device->state_wait); |
b411b363 | 5612 | |
2735a594 | 5613 | return 0; |
b411b363 PR |
5614 | } |
5615 | ||
bde89a9e | 5616 | static int got_Ping(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5617 | { |
bde89a9e | 5618 | return drbd_send_ping_ack(connection); |
b411b363 PR |
5619 | |
5620 | } | |
5621 | ||
bde89a9e | 5622 | static int got_PingAck(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 PR |
5623 | { |
5624 | /* restore idle timeout */ | |
bde89a9e AG |
5625 | connection->meta.socket->sk->sk_rcvtimeo = connection->net_conf->ping_int*HZ; |
5626 | if (!test_and_set_bit(GOT_PING_ACK, &connection->flags)) | |
5627 | wake_up(&connection->ping_wait); | |
b411b363 | 5628 | |
2735a594 | 5629 | return 0; |
b411b363 PR |
5630 | } |
5631 | ||
bde89a9e | 5632 | static int got_IsInSync(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5633 | { |
9f4fe9ad | 5634 | struct drbd_peer_device *peer_device; |
b30ab791 | 5635 | struct drbd_device *device; |
e658983a | 5636 | struct p_block_ack *p = pi->data; |
b411b363 PR |
5637 | sector_t sector = be64_to_cpu(p->sector); |
5638 | int blksize = be32_to_cpu(p->blksize); | |
5639 | ||
9f4fe9ad AG |
5640 | peer_device = conn_peer_device(connection, pi->vnr); |
5641 | if (!peer_device) | |
2735a594 | 5642 | return -EIO; |
9f4fe9ad | 5643 | device = peer_device->device; |
1952e916 | 5644 | |
9f4fe9ad | 5645 | D_ASSERT(device, peer_device->connection->agreed_pro_version >= 89); |
b411b363 | 5646 | |
69a22773 | 5647 | update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
b411b363 | 5648 | |
b30ab791 AG |
5649 | if (get_ldev(device)) { |
5650 | drbd_rs_complete_io(device, sector); | |
5651 | drbd_set_in_sync(device, sector, blksize); | |
1d53f09e | 5652 | /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ |
b30ab791 AG |
5653 | device->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); |
5654 | put_ldev(device); | |
1d53f09e | 5655 | } |
b30ab791 AG |
5656 | dec_rs_pending(device); |
5657 | atomic_add(blksize >> 9, &device->rs_sect_in); | |
b411b363 | 5658 | |
2735a594 | 5659 | return 0; |
b411b363 PR |
5660 | } |
5661 | ||
bc9c5c41 | 5662 | static int |
b30ab791 | 5663 | validate_req_change_req_state(struct drbd_device *device, u64 id, sector_t sector, |
bc9c5c41 AG |
5664 | struct rb_root *root, const char *func, |
5665 | enum drbd_req_event what, bool missing_ok) | |
b411b363 PR |
5666 | { |
5667 | struct drbd_request *req; | |
5668 | struct bio_and_error m; | |
5669 | ||
0500813f | 5670 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 | 5671 | req = find_request(device, root, id, sector, missing_ok, func); |
b411b363 | 5672 | if (unlikely(!req)) { |
0500813f | 5673 | spin_unlock_irq(&device->resource->req_lock); |
85997675 | 5674 | return -EIO; |
b411b363 PR |
5675 | } |
5676 | __req_mod(req, what, &m); | |
0500813f | 5677 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 PR |
5678 | |
5679 | if (m.bio) | |
b30ab791 | 5680 | complete_master_bio(device, &m); |
85997675 | 5681 | return 0; |
b411b363 PR |
5682 | } |
5683 | ||
bde89a9e | 5684 | static int got_BlockAck(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5685 | { |
9f4fe9ad | 5686 | struct drbd_peer_device *peer_device; |
b30ab791 | 5687 | struct drbd_device *device; |
e658983a | 5688 | struct p_block_ack *p = pi->data; |
b411b363 PR |
5689 | sector_t sector = be64_to_cpu(p->sector); |
5690 | int blksize = be32_to_cpu(p->blksize); | |
5691 | enum drbd_req_event what; | |
5692 | ||
9f4fe9ad AG |
5693 | peer_device = conn_peer_device(connection, pi->vnr); |
5694 | if (!peer_device) | |
2735a594 | 5695 | return -EIO; |
9f4fe9ad | 5696 | device = peer_device->device; |
1952e916 | 5697 | |
69a22773 | 5698 | update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
b411b363 | 5699 | |
579b57ed | 5700 | if (p->block_id == ID_SYNCER) { |
b30ab791 AG |
5701 | drbd_set_in_sync(device, sector, blksize); |
5702 | dec_rs_pending(device); | |
2735a594 | 5703 | return 0; |
b411b363 | 5704 | } |
e05e1e59 | 5705 | switch (pi->cmd) { |
b411b363 | 5706 | case P_RS_WRITE_ACK: |
8554df1c | 5707 | what = WRITE_ACKED_BY_PEER_AND_SIS; |
b411b363 PR |
5708 | break; |
5709 | case P_WRITE_ACK: | |
8554df1c | 5710 | what = WRITE_ACKED_BY_PEER; |
b411b363 PR |
5711 | break; |
5712 | case P_RECV_ACK: | |
8554df1c | 5713 | what = RECV_ACKED_BY_PEER; |
b411b363 | 5714 | break; |
d4dabbe2 LE |
5715 | case P_SUPERSEDED: |
5716 | what = CONFLICT_RESOLVED; | |
b411b363 | 5717 | break; |
7be8da07 | 5718 | case P_RETRY_WRITE: |
7be8da07 | 5719 | what = POSTPONE_WRITE; |
b411b363 PR |
5720 | break; |
5721 | default: | |
2735a594 | 5722 | BUG(); |
b411b363 PR |
5723 | } |
5724 | ||
b30ab791 AG |
5725 | return validate_req_change_req_state(device, p->block_id, sector, |
5726 | &device->write_requests, __func__, | |
2735a594 | 5727 | what, false); |
b411b363 PR |
5728 | } |
5729 | ||
bde89a9e | 5730 | static int got_NegAck(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5731 | { |
9f4fe9ad | 5732 | struct drbd_peer_device *peer_device; |
b30ab791 | 5733 | struct drbd_device *device; |
e658983a | 5734 | struct p_block_ack *p = pi->data; |
b411b363 | 5735 | sector_t sector = be64_to_cpu(p->sector); |
2deb8336 | 5736 | int size = be32_to_cpu(p->blksize); |
85997675 | 5737 | int err; |
b411b363 | 5738 | |
9f4fe9ad AG |
5739 | peer_device = conn_peer_device(connection, pi->vnr); |
5740 | if (!peer_device) | |
2735a594 | 5741 | return -EIO; |
9f4fe9ad | 5742 | device = peer_device->device; |
b411b363 | 5743 | |
69a22773 | 5744 | update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
b411b363 | 5745 | |
579b57ed | 5746 | if (p->block_id == ID_SYNCER) { |
b30ab791 AG |
5747 | dec_rs_pending(device); |
5748 | drbd_rs_failed_io(device, sector, size); | |
2735a594 | 5749 | return 0; |
b411b363 | 5750 | } |
2deb8336 | 5751 | |
b30ab791 AG |
5752 | err = validate_req_change_req_state(device, p->block_id, sector, |
5753 | &device->write_requests, __func__, | |
303d1448 | 5754 | NEG_ACKED, true); |
85997675 | 5755 | if (err) { |
c3afd8f5 AG |
5756 | /* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs. |
5757 | The master bio might already be completed, therefore the | |
5758 | request is no longer in the collision hash. */ | |
5759 | /* In Protocol B we might already have got a P_RECV_ACK | |
5760 | but then get a P_NEG_ACK afterwards. */ | |
b30ab791 | 5761 | drbd_set_out_of_sync(device, sector, size); |
2deb8336 | 5762 | } |
2735a594 | 5763 | return 0; |
b411b363 PR |
5764 | } |
5765 | ||
bde89a9e | 5766 | static int got_NegDReply(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5767 | { |
9f4fe9ad | 5768 | struct drbd_peer_device *peer_device; |
b30ab791 | 5769 | struct drbd_device *device; |
e658983a | 5770 | struct p_block_ack *p = pi->data; |
b411b363 PR |
5771 | sector_t sector = be64_to_cpu(p->sector); |
5772 | ||
9f4fe9ad AG |
5773 | peer_device = conn_peer_device(connection, pi->vnr); |
5774 | if (!peer_device) | |
2735a594 | 5775 | return -EIO; |
9f4fe9ad | 5776 | device = peer_device->device; |
1952e916 | 5777 | |
69a22773 | 5778 | update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
7be8da07 | 5779 | |
d0180171 | 5780 | drbd_err(device, "Got NegDReply; Sector %llus, len %u.\n", |
b411b363 PR |
5781 | (unsigned long long)sector, be32_to_cpu(p->blksize)); |
5782 | ||
b30ab791 AG |
5783 | return validate_req_change_req_state(device, p->block_id, sector, |
5784 | &device->read_requests, __func__, | |
2735a594 | 5785 | NEG_ACKED, false); |
b411b363 PR |
5786 | } |
5787 | ||
bde89a9e | 5788 | static int got_NegRSDReply(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5789 | { |
9f4fe9ad | 5790 | struct drbd_peer_device *peer_device; |
b30ab791 | 5791 | struct drbd_device *device; |
b411b363 PR |
5792 | sector_t sector; |
5793 | int size; | |
e658983a | 5794 | struct p_block_ack *p = pi->data; |
1952e916 | 5795 | |
9f4fe9ad AG |
5796 | peer_device = conn_peer_device(connection, pi->vnr); |
5797 | if (!peer_device) | |
2735a594 | 5798 | return -EIO; |
9f4fe9ad | 5799 | device = peer_device->device; |
b411b363 PR |
5800 | |
5801 | sector = be64_to_cpu(p->sector); | |
5802 | size = be32_to_cpu(p->blksize); | |
b411b363 | 5803 | |
69a22773 | 5804 | update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
b411b363 | 5805 | |
b30ab791 | 5806 | dec_rs_pending(device); |
b411b363 | 5807 | |
b30ab791 AG |
5808 | if (get_ldev_if_state(device, D_FAILED)) { |
5809 | drbd_rs_complete_io(device, sector); | |
e05e1e59 | 5810 | switch (pi->cmd) { |
d612d309 | 5811 | case P_NEG_RS_DREPLY: |
b30ab791 | 5812 | drbd_rs_failed_io(device, sector, size); |
6327c911 | 5813 | break; |
d612d309 PR |
5814 | case P_RS_CANCEL: |
5815 | break; | |
5816 | default: | |
2735a594 | 5817 | BUG(); |
d612d309 | 5818 | } |
b30ab791 | 5819 | put_ldev(device); |
b411b363 PR |
5820 | } |
5821 | ||
2735a594 | 5822 | return 0; |
b411b363 PR |
5823 | } |
5824 | ||
bde89a9e | 5825 | static int got_BarrierAck(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5826 | { |
e658983a | 5827 | struct p_barrier_ack *p = pi->data; |
c06ece6b | 5828 | struct drbd_peer_device *peer_device; |
9ed57dcb | 5829 | int vnr; |
1952e916 | 5830 | |
bde89a9e | 5831 | tl_release(connection, p->barrier, be32_to_cpu(p->set_size)); |
b411b363 | 5832 | |
9ed57dcb | 5833 | rcu_read_lock(); |
c06ece6b AG |
5834 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
5835 | struct drbd_device *device = peer_device->device; | |
5836 | ||
b30ab791 AG |
5837 | if (device->state.conn == C_AHEAD && |
5838 | atomic_read(&device->ap_in_flight) == 0 && | |
5839 | !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &device->flags)) { | |
5840 | device->start_resync_timer.expires = jiffies + HZ; | |
5841 | add_timer(&device->start_resync_timer); | |
9ed57dcb | 5842 | } |
c4752ef1 | 5843 | } |
9ed57dcb | 5844 | rcu_read_unlock(); |
c4752ef1 | 5845 | |
2735a594 | 5846 | return 0; |
b411b363 PR |
5847 | } |
5848 | ||
bde89a9e | 5849 | static int got_OVResult(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5850 | { |
9f4fe9ad | 5851 | struct drbd_peer_device *peer_device; |
b30ab791 | 5852 | struct drbd_device *device; |
e658983a | 5853 | struct p_block_ack *p = pi->data; |
84b8c06b | 5854 | struct drbd_device_work *dw; |
b411b363 PR |
5855 | sector_t sector; |
5856 | int size; | |
5857 | ||
9f4fe9ad AG |
5858 | peer_device = conn_peer_device(connection, pi->vnr); |
5859 | if (!peer_device) | |
2735a594 | 5860 | return -EIO; |
9f4fe9ad | 5861 | device = peer_device->device; |
1952e916 | 5862 | |
b411b363 PR |
5863 | sector = be64_to_cpu(p->sector); |
5864 | size = be32_to_cpu(p->blksize); | |
5865 | ||
69a22773 | 5866 | update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
b411b363 PR |
5867 | |
5868 | if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) | |
b30ab791 | 5869 | drbd_ov_out_of_sync_found(device, sector, size); |
b411b363 | 5870 | else |
b30ab791 | 5871 | ov_out_of_sync_print(device); |
b411b363 | 5872 | |
b30ab791 | 5873 | if (!get_ldev(device)) |
2735a594 | 5874 | return 0; |
1d53f09e | 5875 | |
b30ab791 AG |
5876 | drbd_rs_complete_io(device, sector); |
5877 | dec_rs_pending(device); | |
b411b363 | 5878 | |
b30ab791 | 5879 | --device->ov_left; |
ea5442af LE |
5880 | |
5881 | /* let's advance progress step marks only for every other megabyte */ | |
b30ab791 AG |
5882 | if ((device->ov_left & 0x200) == 0x200) |
5883 | drbd_advance_rs_marks(device, device->ov_left); | |
ea5442af | 5884 | |
b30ab791 | 5885 | if (device->ov_left == 0) { |
84b8c06b AG |
5886 | dw = kmalloc(sizeof(*dw), GFP_NOIO); |
5887 | if (dw) { | |
5888 | dw->w.cb = w_ov_finished; | |
5889 | dw->device = device; | |
5890 | drbd_queue_work(&peer_device->connection->sender_work, &dw->w); | |
b411b363 | 5891 | } else { |
84b8c06b | 5892 | drbd_err(device, "kmalloc(dw) failed."); |
b30ab791 AG |
5893 | ov_out_of_sync_print(device); |
5894 | drbd_resync_finished(device); | |
b411b363 PR |
5895 | } |
5896 | } | |
b30ab791 | 5897 | put_ldev(device); |
2735a594 | 5898 | return 0; |
b411b363 PR |
5899 | } |
5900 | ||
bde89a9e | 5901 | static int got_skip(struct drbd_connection *connection, struct packet_info *pi) |
0ced55a3 | 5902 | { |
2735a594 | 5903 | return 0; |
b411b363 PR |
5904 | } |
5905 | ||
668700b4 PR |
5906 | struct meta_sock_cmd { |
5907 | size_t pkt_size; | |
5908 | int (*fn)(struct drbd_connection *connection, struct packet_info *); | |
5909 | }; | |
5910 | ||
5911 | static void set_rcvtimeo(struct drbd_connection *connection, bool ping_timeout) | |
0ced55a3 | 5912 | { |
668700b4 PR |
5913 | long t; |
5914 | struct net_conf *nc; | |
32862ec7 | 5915 | |
668700b4 PR |
5916 | rcu_read_lock(); |
5917 | nc = rcu_dereference(connection->net_conf); | |
5918 | t = ping_timeout ? nc->ping_timeo : nc->ping_int; | |
5919 | rcu_read_unlock(); | |
c141ebda | 5920 | |
668700b4 PR |
5921 | t *= HZ; |
5922 | if (ping_timeout) | |
5923 | t /= 10; | |
082a3439 | 5924 | |
668700b4 PR |
5925 | connection->meta.socket->sk->sk_rcvtimeo = t; |
5926 | } | |
32862ec7 | 5927 | |
668700b4 PR |
5928 | static void set_ping_timeout(struct drbd_connection *connection) |
5929 | { | |
5930 | set_rcvtimeo(connection, 1); | |
0ced55a3 PR |
5931 | } |
5932 | ||
668700b4 PR |
5933 | static void set_idle_timeout(struct drbd_connection *connection) |
5934 | { | |
5935 | set_rcvtimeo(connection, 0); | |
5936 | } | |
b411b363 | 5937 | |
668700b4 | 5938 | static struct meta_sock_cmd ack_receiver_tbl[] = { |
e658983a AG |
5939 | [P_PING] = { 0, got_Ping }, |
5940 | [P_PING_ACK] = { 0, got_PingAck }, | |
b411b363 PR |
5941 | [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, |
5942 | [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, | |
5943 | [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, | |
d4dabbe2 | 5944 | [P_SUPERSEDED] = { sizeof(struct p_block_ack), got_BlockAck }, |
b411b363 PR |
5945 | [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, |
5946 | [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, | |
1952e916 | 5947 | [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply }, |
b411b363 PR |
5948 | [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, |
5949 | [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, | |
5950 | [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, | |
5951 | [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, | |
02918be2 | 5952 | [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip }, |
1952e916 AG |
5953 | [P_RS_CANCEL] = { sizeof(struct p_block_ack), got_NegRSDReply }, |
5954 | [P_CONN_ST_CHG_REPLY]={ sizeof(struct p_req_state_reply), got_conn_RqSReply }, | |
5955 | [P_RETRY_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, | |
7201b972 | 5956 | }; |
b411b363 | 5957 | |
1c03e520 | 5958 | int drbd_ack_receiver(struct drbd_thread *thi) |
b411b363 | 5959 | { |
bde89a9e | 5960 | struct drbd_connection *connection = thi->connection; |
668700b4 | 5961 | struct meta_sock_cmd *cmd = NULL; |
77351055 | 5962 | struct packet_info pi; |
668700b4 | 5963 | unsigned long pre_recv_jif; |
257d0af6 | 5964 | int rv; |
bde89a9e | 5965 | void *buf = connection->meta.rbuf; |
b411b363 | 5966 | int received = 0; |
bde89a9e | 5967 | unsigned int header_size = drbd_header_size(connection); |
52b061a4 | 5968 | int expect = header_size; |
44ed167d | 5969 | bool ping_timeout_active = false; |
b411b363 | 5970 | |
8b700983 | 5971 | sched_set_fifo_low(current); |
b411b363 | 5972 | |
e77a0a5c | 5973 | while (get_t_state(thi) == RUNNING) { |
80822284 | 5974 | drbd_thread_current_set_cpu(thi); |
b411b363 | 5975 | |
668700b4 | 5976 | conn_reclaim_net_peer_reqs(connection); |
44ed167d | 5977 | |
bde89a9e AG |
5978 | if (test_and_clear_bit(SEND_PING, &connection->flags)) { |
5979 | if (drbd_send_ping(connection)) { | |
1ec861eb | 5980 | drbd_err(connection, "drbd_send_ping has failed\n"); |
b411b363 | 5981 | goto reconnect; |
841ce241 | 5982 | } |
668700b4 | 5983 | set_ping_timeout(connection); |
44ed167d | 5984 | ping_timeout_active = true; |
b411b363 PR |
5985 | } |
5986 | ||
668700b4 | 5987 | pre_recv_jif = jiffies; |
bde89a9e | 5988 | rv = drbd_recv_short(connection->meta.socket, buf, expect-received, 0); |
b411b363 PR |
5989 | |
5990 | /* Note: | |
5991 | * -EINTR (on meta) we got a signal | |
5992 | * -EAGAIN (on meta) rcvtimeo expired | |
5993 | * -ECONNRESET other side closed the connection | |
5994 | * -ERESTARTSYS (on data) we got a signal | |
5995 | * rv < 0 other than above: unexpected error! | |
5996 | * rv == expected: full header or command | |
5997 | * rv < expected: "woken" by signal during receive | |
5998 | * rv == 0 : "connection shut down by peer" | |
5999 | */ | |
6000 | if (likely(rv > 0)) { | |
6001 | received += rv; | |
6002 | buf += rv; | |
6003 | } else if (rv == 0) { | |
bde89a9e | 6004 | if (test_bit(DISCONNECT_SENT, &connection->flags)) { |
b66623e3 PR |
6005 | long t; |
6006 | rcu_read_lock(); | |
bde89a9e | 6007 | t = rcu_dereference(connection->net_conf)->ping_timeo * HZ/10; |
b66623e3 PR |
6008 | rcu_read_unlock(); |
6009 | ||
bde89a9e AG |
6010 | t = wait_event_timeout(connection->ping_wait, |
6011 | connection->cstate < C_WF_REPORT_PARAMS, | |
b66623e3 | 6012 | t); |
599377ac PR |
6013 | if (t) |
6014 | break; | |
6015 | } | |
1ec861eb | 6016 | drbd_err(connection, "meta connection shut down by peer.\n"); |
b411b363 PR |
6017 | goto reconnect; |
6018 | } else if (rv == -EAGAIN) { | |
cb6518cb LE |
6019 | /* If the data socket received something meanwhile, |
6020 | * that is good enough: peer is still alive. */ | |
668700b4 | 6021 | if (time_after(connection->last_received, pre_recv_jif)) |
cb6518cb | 6022 | continue; |
f36af18c | 6023 | if (ping_timeout_active) { |
1ec861eb | 6024 | drbd_err(connection, "PingAck did not arrive in time.\n"); |
b411b363 PR |
6025 | goto reconnect; |
6026 | } | |
bde89a9e | 6027 | set_bit(SEND_PING, &connection->flags); |
b411b363 PR |
6028 | continue; |
6029 | } else if (rv == -EINTR) { | |
668700b4 PR |
6030 | /* maybe drbd_thread_stop(): the while condition will notice. |
6031 | * maybe woken for send_ping: we'll send a ping above, | |
6032 | * and change the rcvtimeo */ | |
6033 | flush_signals(current); | |
b411b363 PR |
6034 | continue; |
6035 | } else { | |
1ec861eb | 6036 | drbd_err(connection, "sock_recvmsg returned %d\n", rv); |
b411b363 PR |
6037 | goto reconnect; |
6038 | } | |
6039 | ||
6040 | if (received == expect && cmd == NULL) { | |
bde89a9e | 6041 | if (decode_header(connection, connection->meta.rbuf, &pi)) |
b411b363 | 6042 | goto reconnect; |
668700b4 PR |
6043 | cmd = &ack_receiver_tbl[pi.cmd]; |
6044 | if (pi.cmd >= ARRAY_SIZE(ack_receiver_tbl) || !cmd->fn) { | |
1ec861eb | 6045 | drbd_err(connection, "Unexpected meta packet %s (0x%04x)\n", |
2fcb8f30 | 6046 | cmdname(pi.cmd), pi.cmd); |
b411b363 PR |
6047 | goto disconnect; |
6048 | } | |
e658983a | 6049 | expect = header_size + cmd->pkt_size; |
52b061a4 | 6050 | if (pi.size != expect - header_size) { |
1ec861eb | 6051 | drbd_err(connection, "Wrong packet size on meta (c: %d, l: %d)\n", |
77351055 | 6052 | pi.cmd, pi.size); |
b411b363 | 6053 | goto reconnect; |
257d0af6 | 6054 | } |
b411b363 PR |
6055 | } |
6056 | if (received == expect) { | |
2735a594 | 6057 | bool err; |
a4fbda8e | 6058 | |
bde89a9e | 6059 | err = cmd->fn(connection, &pi); |
2735a594 | 6060 | if (err) { |
d75f773c | 6061 | drbd_err(connection, "%ps failed\n", cmd->fn); |
b411b363 | 6062 | goto reconnect; |
1952e916 | 6063 | } |
b411b363 | 6064 | |
bde89a9e | 6065 | connection->last_received = jiffies; |
f36af18c | 6066 | |
668700b4 PR |
6067 | if (cmd == &ack_receiver_tbl[P_PING_ACK]) { |
6068 | set_idle_timeout(connection); | |
44ed167d PR |
6069 | ping_timeout_active = false; |
6070 | } | |
f36af18c | 6071 | |
bde89a9e | 6072 | buf = connection->meta.rbuf; |
b411b363 | 6073 | received = 0; |
52b061a4 | 6074 | expect = header_size; |
b411b363 PR |
6075 | cmd = NULL; |
6076 | } | |
6077 | } | |
6078 | ||
6079 | if (0) { | |
6080 | reconnect: | |
bde89a9e AG |
6081 | conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD); |
6082 | conn_md_sync(connection); | |
b411b363 PR |
6083 | } |
6084 | if (0) { | |
6085 | disconnect: | |
bde89a9e | 6086 | conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 | 6087 | } |
b411b363 | 6088 | |
668700b4 | 6089 | drbd_info(connection, "ack_receiver terminated\n"); |
b411b363 PR |
6090 | |
6091 | return 0; | |
6092 | } | |
668700b4 PR |
6093 | |
6094 | void drbd_send_acks_wf(struct work_struct *ws) | |
6095 | { | |
6096 | struct drbd_peer_device *peer_device = | |
6097 | container_of(ws, struct drbd_peer_device, send_acks_work); | |
6098 | struct drbd_connection *connection = peer_device->connection; | |
6099 | struct drbd_device *device = peer_device->device; | |
6100 | struct net_conf *nc; | |
6101 | int tcp_cork, err; | |
6102 | ||
6103 | rcu_read_lock(); | |
6104 | nc = rcu_dereference(connection->net_conf); | |
6105 | tcp_cork = nc->tcp_cork; | |
6106 | rcu_read_unlock(); | |
6107 | ||
6108 | if (tcp_cork) | |
db10538a | 6109 | tcp_sock_set_cork(connection->meta.socket->sk, true); |
668700b4 PR |
6110 | |
6111 | err = drbd_finish_peer_reqs(device); | |
6112 | kref_put(&device->kref, drbd_destroy_device); | |
6113 | /* get is in drbd_endio_write_sec_final(). That is necessary to keep the | |
6114 | struct work_struct send_acks_work alive, which is in the peer_device object */ | |
6115 | ||
6116 | if (err) { | |
6117 | conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD); | |
6118 | return; | |
6119 | } | |
6120 | ||
6121 | if (tcp_cork) | |
db10538a | 6122 | tcp_sock_set_cork(connection->meta.socket->sk, false); |
668700b4 PR |
6123 | |
6124 | return; | |
6125 | } |