Commit | Line | Data |
---|---|---|
c6ae4c04 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
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; | |
114 | while ((tmp = page_chain_next(page))) | |
115 | ++i, page = tmp; | |
116 | if (len) | |
117 | *len = i; | |
118 | return page; | |
119 | } | |
120 | ||
121 | static int page_chain_free(struct page *page) | |
122 | { | |
123 | struct page *tmp; | |
124 | int i = 0; | |
125 | page_chain_for_each_safe(page, tmp) { | |
126 | put_page(page); | |
127 | ++i; | |
128 | } | |
129 | return i; | |
130 | } | |
131 | ||
132 | static void page_chain_add(struct page **head, | |
133 | struct page *chain_first, struct page *chain_last) | |
134 | { | |
135 | #if 1 | |
136 | struct page *tmp; | |
137 | tmp = page_chain_tail(chain_first, NULL); | |
138 | BUG_ON(tmp != chain_last); | |
139 | #endif | |
140 | ||
141 | /* add chain to head */ | |
142 | set_page_private(chain_last, (unsigned long)*head); | |
143 | *head = chain_first; | |
144 | } | |
145 | ||
b30ab791 | 146 | static struct page *__drbd_alloc_pages(struct drbd_device *device, |
18c2d522 | 147 | unsigned int number) |
b411b363 PR |
148 | { |
149 | struct page *page = NULL; | |
45bb912b | 150 | struct page *tmp = NULL; |
18c2d522 | 151 | unsigned int i = 0; |
b411b363 PR |
152 | |
153 | /* Yes, testing drbd_pp_vacant outside the lock is racy. | |
154 | * So what. It saves a spin_lock. */ | |
45bb912b | 155 | if (drbd_pp_vacant >= number) { |
b411b363 | 156 | spin_lock(&drbd_pp_lock); |
45bb912b LE |
157 | page = page_chain_del(&drbd_pp_pool, number); |
158 | if (page) | |
159 | drbd_pp_vacant -= number; | |
b411b363 | 160 | spin_unlock(&drbd_pp_lock); |
45bb912b LE |
161 | if (page) |
162 | return page; | |
b411b363 | 163 | } |
45bb912b | 164 | |
b411b363 PR |
165 | /* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD |
166 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
167 | * which in turn might block on the other node at this very place. */ | |
45bb912b LE |
168 | for (i = 0; i < number; i++) { |
169 | tmp = alloc_page(GFP_TRY); | |
170 | if (!tmp) | |
171 | break; | |
172 | set_page_private(tmp, (unsigned long)page); | |
173 | page = tmp; | |
174 | } | |
175 | ||
176 | if (i == number) | |
177 | return page; | |
178 | ||
179 | /* Not enough pages immediately available this time. | |
c37c8ecf | 180 | * No need to jump around here, drbd_alloc_pages will retry this |
45bb912b LE |
181 | * function "soon". */ |
182 | if (page) { | |
183 | tmp = page_chain_tail(page, NULL); | |
184 | spin_lock(&drbd_pp_lock); | |
185 | page_chain_add(&drbd_pp_pool, page, tmp); | |
186 | drbd_pp_vacant += i; | |
187 | spin_unlock(&drbd_pp_lock); | |
188 | } | |
189 | return NULL; | |
b411b363 PR |
190 | } |
191 | ||
b30ab791 | 192 | static void reclaim_finished_net_peer_reqs(struct drbd_device *device, |
a990be46 | 193 | struct list_head *to_be_freed) |
b411b363 | 194 | { |
a8cd15ba | 195 | struct drbd_peer_request *peer_req, *tmp; |
b411b363 PR |
196 | |
197 | /* The EEs are always appended to the end of the list. Since | |
198 | they are sent in order over the wire, they have to finish | |
199 | in order. As soon as we see the first not finished we can | |
200 | stop to examine the list... */ | |
201 | ||
a8cd15ba | 202 | list_for_each_entry_safe(peer_req, tmp, &device->net_ee, w.list) { |
045417f7 | 203 | if (drbd_peer_req_has_active_page(peer_req)) |
b411b363 | 204 | break; |
a8cd15ba | 205 | list_move(&peer_req->w.list, to_be_freed); |
b411b363 PR |
206 | } |
207 | } | |
208 | ||
668700b4 | 209 | static void drbd_reclaim_net_peer_reqs(struct drbd_device *device) |
b411b363 PR |
210 | { |
211 | LIST_HEAD(reclaimed); | |
db830c46 | 212 | struct drbd_peer_request *peer_req, *t; |
b411b363 | 213 | |
0500813f | 214 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 | 215 | reclaim_finished_net_peer_reqs(device, &reclaimed); |
0500813f | 216 | spin_unlock_irq(&device->resource->req_lock); |
a8cd15ba | 217 | list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) |
b30ab791 | 218 | drbd_free_net_peer_req(device, peer_req); |
b411b363 PR |
219 | } |
220 | ||
668700b4 PR |
221 | static void conn_reclaim_net_peer_reqs(struct drbd_connection *connection) |
222 | { | |
223 | struct drbd_peer_device *peer_device; | |
224 | int vnr; | |
225 | ||
226 | rcu_read_lock(); | |
227 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { | |
228 | struct drbd_device *device = peer_device->device; | |
229 | if (!atomic_read(&device->pp_in_use_by_net)) | |
230 | continue; | |
231 | ||
232 | kref_get(&device->kref); | |
233 | rcu_read_unlock(); | |
234 | drbd_reclaim_net_peer_reqs(device); | |
235 | kref_put(&device->kref, drbd_destroy_device); | |
236 | rcu_read_lock(); | |
237 | } | |
238 | rcu_read_unlock(); | |
239 | } | |
240 | ||
b411b363 | 241 | /** |
c37c8ecf | 242 | * drbd_alloc_pages() - Returns @number pages, retries forever (or until signalled) |
b30ab791 | 243 | * @device: DRBD device. |
45bb912b LE |
244 | * @number: number of pages requested |
245 | * @retry: whether to retry, if not enough pages are available right now | |
246 | * | |
247 | * Tries to allocate number pages, first from our own page pool, then from | |
0e49d7b0 | 248 | * the kernel. |
45bb912b | 249 | * Possibly retry until DRBD frees sufficient pages somewhere else. |
b411b363 | 250 | * |
0e49d7b0 LE |
251 | * If this allocation would exceed the max_buffers setting, we throttle |
252 | * allocation (schedule_timeout) to give the system some room to breathe. | |
253 | * | |
254 | * We do not use max-buffers as hard limit, because it could lead to | |
255 | * congestion and further to a distributed deadlock during online-verify or | |
256 | * (checksum based) resync, if the max-buffers, socket buffer sizes and | |
257 | * resync-rate settings are mis-configured. | |
258 | * | |
45bb912b | 259 | * Returns a page chain linked via page->private. |
b411b363 | 260 | */ |
69a22773 | 261 | struct page *drbd_alloc_pages(struct drbd_peer_device *peer_device, unsigned int number, |
c37c8ecf | 262 | bool retry) |
b411b363 | 263 | { |
69a22773 | 264 | struct drbd_device *device = peer_device->device; |
b411b363 | 265 | struct page *page = NULL; |
44ed167d | 266 | struct net_conf *nc; |
b411b363 | 267 | DEFINE_WAIT(wait); |
0e49d7b0 | 268 | unsigned int mxb; |
b411b363 | 269 | |
44ed167d | 270 | rcu_read_lock(); |
69a22773 | 271 | nc = rcu_dereference(peer_device->connection->net_conf); |
44ed167d PR |
272 | mxb = nc ? nc->max_buffers : 1000000; |
273 | rcu_read_unlock(); | |
274 | ||
b30ab791 AG |
275 | if (atomic_read(&device->pp_in_use) < mxb) |
276 | page = __drbd_alloc_pages(device, number); | |
b411b363 | 277 | |
668700b4 PR |
278 | /* Try to keep the fast path fast, but occasionally we need |
279 | * to reclaim the pages we lended to the network stack. */ | |
280 | if (page && atomic_read(&device->pp_in_use_by_net) > 512) | |
281 | drbd_reclaim_net_peer_reqs(device); | |
282 | ||
45bb912b | 283 | while (page == NULL) { |
b411b363 PR |
284 | prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE); |
285 | ||
668700b4 | 286 | drbd_reclaim_net_peer_reqs(device); |
b411b363 | 287 | |
b30ab791 AG |
288 | if (atomic_read(&device->pp_in_use) < mxb) { |
289 | page = __drbd_alloc_pages(device, number); | |
b411b363 PR |
290 | if (page) |
291 | break; | |
292 | } | |
293 | ||
294 | if (!retry) | |
295 | break; | |
296 | ||
297 | if (signal_pending(current)) { | |
d0180171 | 298 | drbd_warn(device, "drbd_alloc_pages interrupted!\n"); |
b411b363 PR |
299 | break; |
300 | } | |
301 | ||
0e49d7b0 LE |
302 | if (schedule_timeout(HZ/10) == 0) |
303 | mxb = UINT_MAX; | |
b411b363 PR |
304 | } |
305 | finish_wait(&drbd_pp_wait, &wait); | |
306 | ||
45bb912b | 307 | if (page) |
b30ab791 | 308 | atomic_add(number, &device->pp_in_use); |
b411b363 PR |
309 | return page; |
310 | } | |
311 | ||
c37c8ecf | 312 | /* Must not be used from irq, as that may deadlock: see drbd_alloc_pages. |
0500813f | 313 | * Is also used from inside an other spin_lock_irq(&resource->req_lock); |
45bb912b LE |
314 | * Either links the page chain back to the global pool, |
315 | * or returns all pages to the system. */ | |
b30ab791 | 316 | static void drbd_free_pages(struct drbd_device *device, struct page *page, int is_net) |
b411b363 | 317 | { |
b30ab791 | 318 | atomic_t *a = is_net ? &device->pp_in_use_by_net : &device->pp_in_use; |
b411b363 | 319 | int i; |
435f0740 | 320 | |
a73ff323 LE |
321 | if (page == NULL) |
322 | return; | |
323 | ||
183ece30 | 324 | if (drbd_pp_vacant > (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * drbd_minor_count) |
45bb912b LE |
325 | i = page_chain_free(page); |
326 | else { | |
327 | struct page *tmp; | |
328 | tmp = page_chain_tail(page, &i); | |
329 | spin_lock(&drbd_pp_lock); | |
330 | page_chain_add(&drbd_pp_pool, page, tmp); | |
331 | drbd_pp_vacant += i; | |
332 | spin_unlock(&drbd_pp_lock); | |
b411b363 | 333 | } |
435f0740 | 334 | i = atomic_sub_return(i, a); |
45bb912b | 335 | if (i < 0) |
d0180171 | 336 | drbd_warn(device, "ASSERTION FAILED: %s: %d < 0\n", |
435f0740 | 337 | is_net ? "pp_in_use_by_net" : "pp_in_use", i); |
b411b363 PR |
338 | wake_up(&drbd_pp_wait); |
339 | } | |
340 | ||
341 | /* | |
342 | You need to hold the req_lock: | |
343 | _drbd_wait_ee_list_empty() | |
344 | ||
345 | You must not have the req_lock: | |
3967deb1 | 346 | drbd_free_peer_req() |
0db55363 | 347 | drbd_alloc_peer_req() |
7721f567 | 348 | drbd_free_peer_reqs() |
b411b363 | 349 | drbd_ee_fix_bhs() |
a990be46 | 350 | drbd_finish_peer_reqs() |
b411b363 PR |
351 | drbd_clear_done_ee() |
352 | drbd_wait_ee_list_empty() | |
353 | */ | |
354 | ||
9104d31a LE |
355 | /* normal: payload_size == request size (bi_size) |
356 | * w_same: payload_size == logical_block_size | |
357 | * trim: payload_size == 0 */ | |
f6ffca9f | 358 | struct drbd_peer_request * |
69a22773 | 359 | drbd_alloc_peer_req(struct drbd_peer_device *peer_device, u64 id, sector_t sector, |
9104d31a | 360 | unsigned int request_size, unsigned int payload_size, gfp_t gfp_mask) __must_hold(local) |
b411b363 | 361 | { |
69a22773 | 362 | struct drbd_device *device = peer_device->device; |
db830c46 | 363 | struct drbd_peer_request *peer_req; |
a73ff323 | 364 | struct page *page = NULL; |
9104d31a | 365 | unsigned nr_pages = (payload_size + PAGE_SIZE -1) >> PAGE_SHIFT; |
b411b363 | 366 | |
b30ab791 | 367 | if (drbd_insert_fault(device, DRBD_FAULT_AL_EE)) |
b411b363 PR |
368 | return NULL; |
369 | ||
0892fac8 | 370 | peer_req = mempool_alloc(&drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM); |
db830c46 | 371 | if (!peer_req) { |
b411b363 | 372 | if (!(gfp_mask & __GFP_NOWARN)) |
d0180171 | 373 | drbd_err(device, "%s: allocation failed\n", __func__); |
b411b363 PR |
374 | return NULL; |
375 | } | |
376 | ||
9104d31a | 377 | if (nr_pages) { |
d0164adc MG |
378 | page = drbd_alloc_pages(peer_device, nr_pages, |
379 | gfpflags_allow_blocking(gfp_mask)); | |
a73ff323 LE |
380 | if (!page) |
381 | goto fail; | |
382 | } | |
b411b363 | 383 | |
c5a2c150 LE |
384 | memset(peer_req, 0, sizeof(*peer_req)); |
385 | INIT_LIST_HEAD(&peer_req->w.list); | |
db830c46 | 386 | drbd_clear_interval(&peer_req->i); |
9104d31a | 387 | peer_req->i.size = request_size; |
db830c46 | 388 | peer_req->i.sector = sector; |
c5a2c150 | 389 | peer_req->submit_jif = jiffies; |
a8cd15ba | 390 | peer_req->peer_device = peer_device; |
db830c46 | 391 | peer_req->pages = page; |
9a8e7753 AG |
392 | /* |
393 | * The block_id is opaque to the receiver. It is not endianness | |
394 | * converted, and sent back to the sender unchanged. | |
395 | */ | |
db830c46 | 396 | peer_req->block_id = id; |
b411b363 | 397 | |
db830c46 | 398 | return peer_req; |
b411b363 | 399 | |
45bb912b | 400 | fail: |
0892fac8 | 401 | mempool_free(peer_req, &drbd_ee_mempool); |
b411b363 PR |
402 | return NULL; |
403 | } | |
404 | ||
b30ab791 | 405 | void __drbd_free_peer_req(struct drbd_device *device, struct drbd_peer_request *peer_req, |
f6ffca9f | 406 | int is_net) |
b411b363 | 407 | { |
21ae5d7f | 408 | might_sleep(); |
db830c46 AG |
409 | if (peer_req->flags & EE_HAS_DIGEST) |
410 | kfree(peer_req->digest); | |
b30ab791 | 411 | drbd_free_pages(device, peer_req->pages, is_net); |
0b0ba1ef AG |
412 | D_ASSERT(device, atomic_read(&peer_req->pending_bios) == 0); |
413 | D_ASSERT(device, drbd_interval_empty(&peer_req->i)); | |
21ae5d7f LE |
414 | if (!expect(!(peer_req->flags & EE_CALL_AL_COMPLETE_IO))) { |
415 | peer_req->flags &= ~EE_CALL_AL_COMPLETE_IO; | |
416 | drbd_al_complete_io(device, &peer_req->i); | |
417 | } | |
0892fac8 | 418 | mempool_free(peer_req, &drbd_ee_mempool); |
b411b363 PR |
419 | } |
420 | ||
b30ab791 | 421 | int drbd_free_peer_reqs(struct drbd_device *device, struct list_head *list) |
b411b363 PR |
422 | { |
423 | LIST_HEAD(work_list); | |
db830c46 | 424 | struct drbd_peer_request *peer_req, *t; |
b411b363 | 425 | int count = 0; |
b30ab791 | 426 | int is_net = list == &device->net_ee; |
b411b363 | 427 | |
0500813f | 428 | spin_lock_irq(&device->resource->req_lock); |
b411b363 | 429 | list_splice_init(list, &work_list); |
0500813f | 430 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 | 431 | |
a8cd15ba | 432 | list_for_each_entry_safe(peer_req, t, &work_list, w.list) { |
b30ab791 | 433 | __drbd_free_peer_req(device, peer_req, is_net); |
b411b363 PR |
434 | count++; |
435 | } | |
436 | return count; | |
437 | } | |
438 | ||
b411b363 | 439 | /* |
a990be46 | 440 | * See also comments in _req_mod(,BARRIER_ACKED) and receive_Barrier. |
b411b363 | 441 | */ |
b30ab791 | 442 | static int drbd_finish_peer_reqs(struct drbd_device *device) |
b411b363 PR |
443 | { |
444 | LIST_HEAD(work_list); | |
445 | LIST_HEAD(reclaimed); | |
db830c46 | 446 | struct drbd_peer_request *peer_req, *t; |
e2b3032b | 447 | int err = 0; |
b411b363 | 448 | |
0500813f | 449 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 AG |
450 | reclaim_finished_net_peer_reqs(device, &reclaimed); |
451 | list_splice_init(&device->done_ee, &work_list); | |
0500813f | 452 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 | 453 | |
a8cd15ba | 454 | list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) |
b30ab791 | 455 | drbd_free_net_peer_req(device, peer_req); |
b411b363 PR |
456 | |
457 | /* possible callbacks here: | |
d4dabbe2 | 458 | * e_end_block, and e_end_resync_block, e_send_superseded. |
b411b363 PR |
459 | * all ignore the last argument. |
460 | */ | |
a8cd15ba | 461 | list_for_each_entry_safe(peer_req, t, &work_list, w.list) { |
e2b3032b AG |
462 | int err2; |
463 | ||
b411b363 | 464 | /* list_del not necessary, next/prev members not touched */ |
a8cd15ba | 465 | err2 = peer_req->w.cb(&peer_req->w, !!err); |
e2b3032b AG |
466 | if (!err) |
467 | err = err2; | |
b30ab791 | 468 | drbd_free_peer_req(device, peer_req); |
b411b363 | 469 | } |
b30ab791 | 470 | wake_up(&device->ee_wait); |
b411b363 | 471 | |
e2b3032b | 472 | return err; |
b411b363 PR |
473 | } |
474 | ||
b30ab791 | 475 | static void _drbd_wait_ee_list_empty(struct drbd_device *device, |
d4da1537 | 476 | struct list_head *head) |
b411b363 PR |
477 | { |
478 | DEFINE_WAIT(wait); | |
479 | ||
480 | /* avoids spin_lock/unlock | |
481 | * and calling prepare_to_wait in the fast path */ | |
482 | while (!list_empty(head)) { | |
b30ab791 | 483 | prepare_to_wait(&device->ee_wait, &wait, TASK_UNINTERRUPTIBLE); |
0500813f | 484 | spin_unlock_irq(&device->resource->req_lock); |
7eaceacc | 485 | io_schedule(); |
b30ab791 | 486 | finish_wait(&device->ee_wait, &wait); |
0500813f | 487 | spin_lock_irq(&device->resource->req_lock); |
b411b363 PR |
488 | } |
489 | } | |
490 | ||
b30ab791 | 491 | static void drbd_wait_ee_list_empty(struct drbd_device *device, |
d4da1537 | 492 | struct list_head *head) |
b411b363 | 493 | { |
0500813f | 494 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 | 495 | _drbd_wait_ee_list_empty(device, head); |
0500813f | 496 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 PR |
497 | } |
498 | ||
dbd9eea0 | 499 | static int drbd_recv_short(struct socket *sock, void *buf, size_t size, int flags) |
b411b363 | 500 | { |
b411b363 PR |
501 | struct kvec iov = { |
502 | .iov_base = buf, | |
503 | .iov_len = size, | |
504 | }; | |
505 | struct msghdr msg = { | |
b411b363 PR |
506 | .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) |
507 | }; | |
aa563d7b | 508 | iov_iter_kvec(&msg.msg_iter, READ, &iov, 1, size); |
f7765c36 | 509 | return sock_recvmsg(sock, &msg, msg.msg_flags); |
b411b363 PR |
510 | } |
511 | ||
bde89a9e | 512 | static int drbd_recv(struct drbd_connection *connection, void *buf, size_t size) |
b411b363 | 513 | { |
b411b363 PR |
514 | int rv; |
515 | ||
bde89a9e | 516 | rv = drbd_recv_short(connection->data.socket, buf, size, 0); |
b411b363 | 517 | |
dbd0820c PR |
518 | if (rv < 0) { |
519 | if (rv == -ECONNRESET) | |
1ec861eb | 520 | drbd_info(connection, "sock was reset by peer\n"); |
dbd0820c | 521 | else if (rv != -ERESTARTSYS) |
1ec861eb | 522 | drbd_err(connection, "sock_recvmsg returned %d\n", rv); |
dbd0820c | 523 | } else if (rv == 0) { |
bde89a9e | 524 | if (test_bit(DISCONNECT_SENT, &connection->flags)) { |
b66623e3 PR |
525 | long t; |
526 | rcu_read_lock(); | |
bde89a9e | 527 | t = rcu_dereference(connection->net_conf)->ping_timeo * HZ/10; |
b66623e3 PR |
528 | rcu_read_unlock(); |
529 | ||
bde89a9e | 530 | t = wait_event_timeout(connection->ping_wait, connection->cstate < C_WF_REPORT_PARAMS, t); |
b66623e3 | 531 | |
599377ac PR |
532 | if (t) |
533 | goto out; | |
534 | } | |
1ec861eb | 535 | drbd_info(connection, "sock was shut down by peer\n"); |
599377ac PR |
536 | } |
537 | ||
b411b363 | 538 | if (rv != size) |
bde89a9e | 539 | conn_request_state(connection, NS(conn, C_BROKEN_PIPE), CS_HARD); |
b411b363 | 540 | |
599377ac | 541 | out: |
b411b363 PR |
542 | return rv; |
543 | } | |
544 | ||
bde89a9e | 545 | static int drbd_recv_all(struct drbd_connection *connection, void *buf, size_t size) |
c6967746 AG |
546 | { |
547 | int err; | |
548 | ||
bde89a9e | 549 | err = drbd_recv(connection, buf, size); |
c6967746 AG |
550 | if (err != size) { |
551 | if (err >= 0) | |
552 | err = -EIO; | |
553 | } else | |
554 | err = 0; | |
555 | return err; | |
556 | } | |
557 | ||
bde89a9e | 558 | static int drbd_recv_all_warn(struct drbd_connection *connection, void *buf, size_t size) |
a5c31904 AG |
559 | { |
560 | int err; | |
561 | ||
bde89a9e | 562 | err = drbd_recv_all(connection, buf, size); |
a5c31904 | 563 | if (err && !signal_pending(current)) |
1ec861eb | 564 | drbd_warn(connection, "short read (expected size %d)\n", (int)size); |
a5c31904 AG |
565 | return err; |
566 | } | |
567 | ||
5dbf1673 LE |
568 | /* quoting tcp(7): |
569 | * On individual connections, the socket buffer size must be set prior to the | |
570 | * listen(2) or connect(2) calls in order to have it take effect. | |
571 | * This is our wrapper to do so. | |
572 | */ | |
573 | static void drbd_setbufsize(struct socket *sock, unsigned int snd, | |
574 | unsigned int rcv) | |
575 | { | |
576 | /* open coded SO_SNDBUF, SO_RCVBUF */ | |
577 | if (snd) { | |
578 | sock->sk->sk_sndbuf = snd; | |
579 | sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; | |
580 | } | |
581 | if (rcv) { | |
582 | sock->sk->sk_rcvbuf = rcv; | |
583 | sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; | |
584 | } | |
585 | } | |
586 | ||
bde89a9e | 587 | static struct socket *drbd_try_connect(struct drbd_connection *connection) |
b411b363 PR |
588 | { |
589 | const char *what; | |
590 | struct socket *sock; | |
591 | struct sockaddr_in6 src_in6; | |
44ed167d PR |
592 | struct sockaddr_in6 peer_in6; |
593 | struct net_conf *nc; | |
594 | int err, peer_addr_len, my_addr_len; | |
69ef82de | 595 | int sndbuf_size, rcvbuf_size, connect_int; |
b411b363 PR |
596 | int disconnect_on_error = 1; |
597 | ||
44ed167d | 598 | rcu_read_lock(); |
bde89a9e | 599 | nc = rcu_dereference(connection->net_conf); |
44ed167d PR |
600 | if (!nc) { |
601 | rcu_read_unlock(); | |
b411b363 | 602 | return NULL; |
44ed167d | 603 | } |
44ed167d PR |
604 | sndbuf_size = nc->sndbuf_size; |
605 | rcvbuf_size = nc->rcvbuf_size; | |
69ef82de | 606 | connect_int = nc->connect_int; |
089c075d | 607 | rcu_read_unlock(); |
44ed167d | 608 | |
bde89a9e AG |
609 | my_addr_len = min_t(int, connection->my_addr_len, sizeof(src_in6)); |
610 | memcpy(&src_in6, &connection->my_addr, my_addr_len); | |
44ed167d | 611 | |
bde89a9e | 612 | if (((struct sockaddr *)&connection->my_addr)->sa_family == AF_INET6) |
44ed167d PR |
613 | src_in6.sin6_port = 0; |
614 | else | |
615 | ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ | |
616 | ||
bde89a9e AG |
617 | peer_addr_len = min_t(int, connection->peer_addr_len, sizeof(src_in6)); |
618 | memcpy(&peer_in6, &connection->peer_addr, peer_addr_len); | |
b411b363 PR |
619 | |
620 | what = "sock_create_kern"; | |
eeb1bd5c | 621 | err = sock_create_kern(&init_net, ((struct sockaddr *)&src_in6)->sa_family, |
44ed167d | 622 | SOCK_STREAM, IPPROTO_TCP, &sock); |
b411b363 PR |
623 | if (err < 0) { |
624 | sock = NULL; | |
625 | goto out; | |
626 | } | |
627 | ||
628 | sock->sk->sk_rcvtimeo = | |
69ef82de | 629 | sock->sk->sk_sndtimeo = connect_int * HZ; |
44ed167d | 630 | drbd_setbufsize(sock, sndbuf_size, rcvbuf_size); |
b411b363 PR |
631 | |
632 | /* explicitly bind to the configured IP as source IP | |
633 | * for the outgoing connections. | |
634 | * This is needed for multihomed hosts and to be | |
635 | * able to use lo: interfaces for drbd. | |
636 | * Make sure to use 0 as port number, so linux selects | |
637 | * a free one dynamically. | |
638 | */ | |
b411b363 | 639 | what = "bind before connect"; |
44ed167d | 640 | err = sock->ops->bind(sock, (struct sockaddr *) &src_in6, my_addr_len); |
b411b363 PR |
641 | if (err < 0) |
642 | goto out; | |
643 | ||
644 | /* connect may fail, peer not yet available. | |
645 | * stay C_WF_CONNECTION, don't go Disconnecting! */ | |
646 | disconnect_on_error = 0; | |
647 | what = "connect"; | |
44ed167d | 648 | err = sock->ops->connect(sock, (struct sockaddr *) &peer_in6, peer_addr_len, 0); |
b411b363 PR |
649 | |
650 | out: | |
651 | if (err < 0) { | |
652 | if (sock) { | |
653 | sock_release(sock); | |
654 | sock = NULL; | |
655 | } | |
656 | switch (-err) { | |
657 | /* timeout, busy, signal pending */ | |
658 | case ETIMEDOUT: case EAGAIN: case EINPROGRESS: | |
659 | case EINTR: case ERESTARTSYS: | |
660 | /* peer not (yet) available, network problem */ | |
661 | case ECONNREFUSED: case ENETUNREACH: | |
662 | case EHOSTDOWN: case EHOSTUNREACH: | |
663 | disconnect_on_error = 0; | |
664 | break; | |
665 | default: | |
1ec861eb | 666 | drbd_err(connection, "%s failed, err = %d\n", what, err); |
b411b363 PR |
667 | } |
668 | if (disconnect_on_error) | |
bde89a9e | 669 | conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 | 670 | } |
44ed167d | 671 | |
b411b363 PR |
672 | return sock; |
673 | } | |
674 | ||
7a426fd8 | 675 | struct accept_wait_data { |
bde89a9e | 676 | struct drbd_connection *connection; |
7a426fd8 PR |
677 | struct socket *s_listen; |
678 | struct completion door_bell; | |
679 | void (*original_sk_state_change)(struct sock *sk); | |
680 | ||
681 | }; | |
682 | ||
715306f6 | 683 | static void drbd_incoming_connection(struct sock *sk) |
7a426fd8 PR |
684 | { |
685 | struct accept_wait_data *ad = sk->sk_user_data; | |
715306f6 | 686 | void (*state_change)(struct sock *sk); |
7a426fd8 | 687 | |
715306f6 AG |
688 | state_change = ad->original_sk_state_change; |
689 | if (sk->sk_state == TCP_ESTABLISHED) | |
690 | complete(&ad->door_bell); | |
691 | state_change(sk); | |
7a426fd8 PR |
692 | } |
693 | ||
bde89a9e | 694 | static int prepare_listen_socket(struct drbd_connection *connection, struct accept_wait_data *ad) |
b411b363 | 695 | { |
1f3e509b | 696 | int err, sndbuf_size, rcvbuf_size, my_addr_len; |
44ed167d | 697 | struct sockaddr_in6 my_addr; |
1f3e509b | 698 | struct socket *s_listen; |
44ed167d | 699 | struct net_conf *nc; |
b411b363 PR |
700 | const char *what; |
701 | ||
44ed167d | 702 | rcu_read_lock(); |
bde89a9e | 703 | nc = rcu_dereference(connection->net_conf); |
44ed167d PR |
704 | if (!nc) { |
705 | rcu_read_unlock(); | |
7a426fd8 | 706 | return -EIO; |
44ed167d | 707 | } |
44ed167d PR |
708 | sndbuf_size = nc->sndbuf_size; |
709 | rcvbuf_size = nc->rcvbuf_size; | |
44ed167d | 710 | rcu_read_unlock(); |
b411b363 | 711 | |
bde89a9e AG |
712 | my_addr_len = min_t(int, connection->my_addr_len, sizeof(struct sockaddr_in6)); |
713 | memcpy(&my_addr, &connection->my_addr, my_addr_len); | |
b411b363 PR |
714 | |
715 | what = "sock_create_kern"; | |
eeb1bd5c | 716 | err = sock_create_kern(&init_net, ((struct sockaddr *)&my_addr)->sa_family, |
1f3e509b | 717 | SOCK_STREAM, IPPROTO_TCP, &s_listen); |
b411b363 PR |
718 | if (err) { |
719 | s_listen = NULL; | |
720 | goto out; | |
721 | } | |
722 | ||
98683650 | 723 | s_listen->sk->sk_reuse = SK_CAN_REUSE; /* SO_REUSEADDR */ |
44ed167d | 724 | drbd_setbufsize(s_listen, sndbuf_size, rcvbuf_size); |
b411b363 PR |
725 | |
726 | what = "bind before listen"; | |
44ed167d | 727 | err = s_listen->ops->bind(s_listen, (struct sockaddr *)&my_addr, my_addr_len); |
b411b363 PR |
728 | if (err < 0) |
729 | goto out; | |
730 | ||
7a426fd8 PR |
731 | ad->s_listen = s_listen; |
732 | write_lock_bh(&s_listen->sk->sk_callback_lock); | |
733 | ad->original_sk_state_change = s_listen->sk->sk_state_change; | |
715306f6 | 734 | s_listen->sk->sk_state_change = drbd_incoming_connection; |
7a426fd8 PR |
735 | s_listen->sk->sk_user_data = ad; |
736 | write_unlock_bh(&s_listen->sk->sk_callback_lock); | |
b411b363 | 737 | |
2820fd39 PR |
738 | what = "listen"; |
739 | err = s_listen->ops->listen(s_listen, 5); | |
740 | if (err < 0) | |
741 | goto out; | |
742 | ||
7a426fd8 | 743 | return 0; |
b411b363 PR |
744 | out: |
745 | if (s_listen) | |
746 | sock_release(s_listen); | |
747 | if (err < 0) { | |
748 | if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { | |
1ec861eb | 749 | drbd_err(connection, "%s failed, err = %d\n", what, err); |
bde89a9e | 750 | conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 PR |
751 | } |
752 | } | |
b411b363 | 753 | |
7a426fd8 | 754 | return -EIO; |
b411b363 PR |
755 | } |
756 | ||
715306f6 | 757 | static void unregister_state_change(struct sock *sk, struct accept_wait_data *ad) |
b411b363 | 758 | { |
715306f6 AG |
759 | write_lock_bh(&sk->sk_callback_lock); |
760 | sk->sk_state_change = ad->original_sk_state_change; | |
761 | sk->sk_user_data = NULL; | |
762 | write_unlock_bh(&sk->sk_callback_lock); | |
b411b363 PR |
763 | } |
764 | ||
bde89a9e | 765 | static struct socket *drbd_wait_for_connect(struct drbd_connection *connection, struct accept_wait_data *ad) |
b411b363 | 766 | { |
1f3e509b PR |
767 | int timeo, connect_int, err = 0; |
768 | struct socket *s_estab = NULL; | |
1f3e509b PR |
769 | struct net_conf *nc; |
770 | ||
771 | rcu_read_lock(); | |
bde89a9e | 772 | nc = rcu_dereference(connection->net_conf); |
1f3e509b PR |
773 | if (!nc) { |
774 | rcu_read_unlock(); | |
775 | return NULL; | |
776 | } | |
777 | connect_int = nc->connect_int; | |
778 | rcu_read_unlock(); | |
779 | ||
780 | timeo = connect_int * HZ; | |
38b682b2 AM |
781 | /* 28.5% random jitter */ |
782 | timeo += (prandom_u32() & 1) ? timeo / 7 : -timeo / 7; | |
1f3e509b | 783 | |
7a426fd8 PR |
784 | err = wait_for_completion_interruptible_timeout(&ad->door_bell, timeo); |
785 | if (err <= 0) | |
786 | return NULL; | |
b411b363 | 787 | |
7a426fd8 | 788 | err = kernel_accept(ad->s_listen, &s_estab, 0); |
b411b363 PR |
789 | if (err < 0) { |
790 | if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { | |
1ec861eb | 791 | drbd_err(connection, "accept failed, err = %d\n", err); |
bde89a9e | 792 | conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 PR |
793 | } |
794 | } | |
b411b363 | 795 | |
715306f6 AG |
796 | if (s_estab) |
797 | unregister_state_change(s_estab->sk, ad); | |
b411b363 | 798 | |
b411b363 PR |
799 | return s_estab; |
800 | } | |
b411b363 | 801 | |
bde89a9e | 802 | static int decode_header(struct drbd_connection *, void *, struct packet_info *); |
b411b363 | 803 | |
bde89a9e | 804 | static int send_first_packet(struct drbd_connection *connection, struct drbd_socket *sock, |
9f5bdc33 AG |
805 | enum drbd_packet cmd) |
806 | { | |
bde89a9e | 807 | if (!conn_prepare_command(connection, sock)) |
9f5bdc33 | 808 | return -EIO; |
bde89a9e | 809 | return conn_send_command(connection, sock, cmd, 0, NULL, 0); |
b411b363 PR |
810 | } |
811 | ||
bde89a9e | 812 | static int receive_first_packet(struct drbd_connection *connection, struct socket *sock) |
b411b363 | 813 | { |
bde89a9e | 814 | unsigned int header_size = drbd_header_size(connection); |
9f5bdc33 | 815 | struct packet_info pi; |
4920e37a | 816 | struct net_conf *nc; |
9f5bdc33 | 817 | int err; |
b411b363 | 818 | |
4920e37a PR |
819 | rcu_read_lock(); |
820 | nc = rcu_dereference(connection->net_conf); | |
821 | if (!nc) { | |
822 | rcu_read_unlock(); | |
823 | return -EIO; | |
824 | } | |
825 | sock->sk->sk_rcvtimeo = nc->ping_timeo * 4 * HZ / 10; | |
826 | rcu_read_unlock(); | |
827 | ||
bde89a9e | 828 | err = drbd_recv_short(sock, connection->data.rbuf, header_size, 0); |
9f5bdc33 AG |
829 | if (err != header_size) { |
830 | if (err >= 0) | |
831 | err = -EIO; | |
832 | return err; | |
833 | } | |
bde89a9e | 834 | err = decode_header(connection, connection->data.rbuf, &pi); |
9f5bdc33 AG |
835 | if (err) |
836 | return err; | |
837 | return pi.cmd; | |
b411b363 PR |
838 | } |
839 | ||
840 | /** | |
841 | * drbd_socket_okay() - Free the socket if its connection is not okay | |
b411b363 PR |
842 | * @sock: pointer to the pointer to the socket. |
843 | */ | |
5d0b17f1 | 844 | static bool drbd_socket_okay(struct socket **sock) |
b411b363 PR |
845 | { |
846 | int rr; | |
847 | char tb[4]; | |
848 | ||
849 | if (!*sock) | |
81e84650 | 850 | return false; |
b411b363 | 851 | |
dbd9eea0 | 852 | rr = drbd_recv_short(*sock, tb, 4, MSG_DONTWAIT | MSG_PEEK); |
b411b363 PR |
853 | |
854 | if (rr > 0 || rr == -EAGAIN) { | |
81e84650 | 855 | return true; |
b411b363 PR |
856 | } else { |
857 | sock_release(*sock); | |
858 | *sock = NULL; | |
81e84650 | 859 | return false; |
b411b363 PR |
860 | } |
861 | } | |
5d0b17f1 PR |
862 | |
863 | static bool connection_established(struct drbd_connection *connection, | |
864 | struct socket **sock1, | |
865 | struct socket **sock2) | |
866 | { | |
867 | struct net_conf *nc; | |
868 | int timeout; | |
869 | bool ok; | |
870 | ||
871 | if (!*sock1 || !*sock2) | |
872 | return false; | |
873 | ||
874 | rcu_read_lock(); | |
875 | nc = rcu_dereference(connection->net_conf); | |
876 | timeout = (nc->sock_check_timeo ?: nc->ping_timeo) * HZ / 10; | |
877 | rcu_read_unlock(); | |
878 | schedule_timeout_interruptible(timeout); | |
879 | ||
880 | ok = drbd_socket_okay(sock1); | |
881 | ok = drbd_socket_okay(sock2) && ok; | |
882 | ||
883 | return ok; | |
884 | } | |
885 | ||
2325eb66 PR |
886 | /* Gets called if a connection is established, or if a new minor gets created |
887 | in a connection */ | |
69a22773 | 888 | int drbd_connected(struct drbd_peer_device *peer_device) |
907599e0 | 889 | { |
69a22773 | 890 | struct drbd_device *device = peer_device->device; |
0829f5ed | 891 | int err; |
907599e0 | 892 | |
b30ab791 AG |
893 | atomic_set(&device->packet_seq, 0); |
894 | device->peer_seq = 0; | |
907599e0 | 895 | |
69a22773 AG |
896 | device->state_mutex = peer_device->connection->agreed_pro_version < 100 ? |
897 | &peer_device->connection->cstate_mutex : | |
b30ab791 | 898 | &device->own_state_mutex; |
8410da8f | 899 | |
69a22773 | 900 | err = drbd_send_sync_param(peer_device); |
0829f5ed | 901 | if (!err) |
69a22773 | 902 | err = drbd_send_sizes(peer_device, 0, 0); |
0829f5ed | 903 | if (!err) |
69a22773 | 904 | err = drbd_send_uuids(peer_device); |
0829f5ed | 905 | if (!err) |
69a22773 | 906 | err = drbd_send_current_state(peer_device); |
b30ab791 AG |
907 | clear_bit(USE_DEGR_WFC_T, &device->flags); |
908 | clear_bit(RESIZE_PENDING, &device->flags); | |
909 | atomic_set(&device->ap_in_flight, 0); | |
910 | mod_timer(&device->request_timer, jiffies + HZ); /* just start it here. */ | |
0829f5ed | 911 | return err; |
907599e0 | 912 | } |
b411b363 PR |
913 | |
914 | /* | |
915 | * return values: | |
916 | * 1 yes, we have a valid connection | |
917 | * 0 oops, did not work out, please try again | |
918 | * -1 peer talks different language, | |
919 | * no point in trying again, please go standalone. | |
920 | * -2 We do not have a network config... | |
921 | */ | |
bde89a9e | 922 | static int conn_connect(struct drbd_connection *connection) |
b411b363 | 923 | { |
7da35862 | 924 | struct drbd_socket sock, msock; |
c06ece6b | 925 | struct drbd_peer_device *peer_device; |
44ed167d | 926 | struct net_conf *nc; |
5d0b17f1 PR |
927 | int vnr, timeout, h; |
928 | bool discard_my_data, ok; | |
197296ff | 929 | enum drbd_state_rv rv; |
7a426fd8 | 930 | struct accept_wait_data ad = { |
bde89a9e | 931 | .connection = connection, |
7a426fd8 PR |
932 | .door_bell = COMPLETION_INITIALIZER_ONSTACK(ad.door_bell), |
933 | }; | |
b411b363 | 934 | |
bde89a9e AG |
935 | clear_bit(DISCONNECT_SENT, &connection->flags); |
936 | if (conn_request_state(connection, NS(conn, C_WF_CONNECTION), CS_VERBOSE) < SS_SUCCESS) | |
b411b363 PR |
937 | return -2; |
938 | ||
7da35862 | 939 | mutex_init(&sock.mutex); |
bde89a9e AG |
940 | sock.sbuf = connection->data.sbuf; |
941 | sock.rbuf = connection->data.rbuf; | |
7da35862 PR |
942 | sock.socket = NULL; |
943 | mutex_init(&msock.mutex); | |
bde89a9e AG |
944 | msock.sbuf = connection->meta.sbuf; |
945 | msock.rbuf = connection->meta.rbuf; | |
7da35862 PR |
946 | msock.socket = NULL; |
947 | ||
0916e0e3 | 948 | /* Assume that the peer only understands protocol 80 until we know better. */ |
bde89a9e | 949 | connection->agreed_pro_version = 80; |
b411b363 | 950 | |
bde89a9e | 951 | if (prepare_listen_socket(connection, &ad)) |
7a426fd8 | 952 | return 0; |
b411b363 PR |
953 | |
954 | do { | |
2bf89621 | 955 | struct socket *s; |
b411b363 | 956 | |
bde89a9e | 957 | s = drbd_try_connect(connection); |
b411b363 | 958 | if (s) { |
7da35862 PR |
959 | if (!sock.socket) { |
960 | sock.socket = s; | |
bde89a9e | 961 | send_first_packet(connection, &sock, P_INITIAL_DATA); |
7da35862 | 962 | } else if (!msock.socket) { |
bde89a9e | 963 | clear_bit(RESOLVE_CONFLICTS, &connection->flags); |
7da35862 | 964 | msock.socket = s; |
bde89a9e | 965 | send_first_packet(connection, &msock, P_INITIAL_META); |
b411b363 | 966 | } else { |
1ec861eb | 967 | drbd_err(connection, "Logic error in conn_connect()\n"); |
b411b363 PR |
968 | goto out_release_sockets; |
969 | } | |
970 | } | |
971 | ||
5d0b17f1 PR |
972 | if (connection_established(connection, &sock.socket, &msock.socket)) |
973 | break; | |
b411b363 PR |
974 | |
975 | retry: | |
bde89a9e | 976 | s = drbd_wait_for_connect(connection, &ad); |
b411b363 | 977 | if (s) { |
bde89a9e | 978 | int fp = receive_first_packet(connection, s); |
7da35862 PR |
979 | drbd_socket_okay(&sock.socket); |
980 | drbd_socket_okay(&msock.socket); | |
92f14951 | 981 | switch (fp) { |
e5d6f33a | 982 | case P_INITIAL_DATA: |
7da35862 | 983 | if (sock.socket) { |
1ec861eb | 984 | drbd_warn(connection, "initial packet S crossed\n"); |
7da35862 | 985 | sock_release(sock.socket); |
80c6eed4 PR |
986 | sock.socket = s; |
987 | goto randomize; | |
b411b363 | 988 | } |
7da35862 | 989 | sock.socket = s; |
b411b363 | 990 | break; |
e5d6f33a | 991 | case P_INITIAL_META: |
bde89a9e | 992 | set_bit(RESOLVE_CONFLICTS, &connection->flags); |
7da35862 | 993 | if (msock.socket) { |
1ec861eb | 994 | drbd_warn(connection, "initial packet M crossed\n"); |
7da35862 | 995 | sock_release(msock.socket); |
80c6eed4 PR |
996 | msock.socket = s; |
997 | goto randomize; | |
b411b363 | 998 | } |
7da35862 | 999 | msock.socket = s; |
b411b363 PR |
1000 | break; |
1001 | default: | |
1ec861eb | 1002 | drbd_warn(connection, "Error receiving initial packet\n"); |
b411b363 | 1003 | sock_release(s); |
80c6eed4 | 1004 | randomize: |
38b682b2 | 1005 | if (prandom_u32() & 1) |
b411b363 PR |
1006 | goto retry; |
1007 | } | |
1008 | } | |
1009 | ||
bde89a9e | 1010 | if (connection->cstate <= C_DISCONNECTING) |
b411b363 PR |
1011 | goto out_release_sockets; |
1012 | if (signal_pending(current)) { | |
1013 | flush_signals(current); | |
1014 | smp_rmb(); | |
bde89a9e | 1015 | if (get_t_state(&connection->receiver) == EXITING) |
b411b363 PR |
1016 | goto out_release_sockets; |
1017 | } | |
1018 | ||
5d0b17f1 | 1019 | ok = connection_established(connection, &sock.socket, &msock.socket); |
b666dbf8 | 1020 | } while (!ok); |
b411b363 | 1021 | |
7a426fd8 PR |
1022 | if (ad.s_listen) |
1023 | sock_release(ad.s_listen); | |
b411b363 | 1024 | |
98683650 PR |
1025 | sock.socket->sk->sk_reuse = SK_CAN_REUSE; /* SO_REUSEADDR */ |
1026 | msock.socket->sk->sk_reuse = SK_CAN_REUSE; /* SO_REUSEADDR */ | |
b411b363 | 1027 | |
7da35862 PR |
1028 | sock.socket->sk->sk_allocation = GFP_NOIO; |
1029 | msock.socket->sk->sk_allocation = GFP_NOIO; | |
b411b363 | 1030 | |
7da35862 PR |
1031 | sock.socket->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; |
1032 | msock.socket->sk->sk_priority = TC_PRIO_INTERACTIVE; | |
b411b363 | 1033 | |
b411b363 | 1034 | /* NOT YET ... |
bde89a9e | 1035 | * sock.socket->sk->sk_sndtimeo = connection->net_conf->timeout*HZ/10; |
7da35862 | 1036 | * sock.socket->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; |
6038178e | 1037 | * first set it to the P_CONNECTION_FEATURES timeout, |
b411b363 | 1038 | * which we set to 4x the configured ping_timeout. */ |
44ed167d | 1039 | rcu_read_lock(); |
bde89a9e | 1040 | nc = rcu_dereference(connection->net_conf); |
44ed167d | 1041 | |
7da35862 PR |
1042 | sock.socket->sk->sk_sndtimeo = |
1043 | sock.socket->sk->sk_rcvtimeo = nc->ping_timeo*4*HZ/10; | |
b411b363 | 1044 | |
7da35862 | 1045 | msock.socket->sk->sk_rcvtimeo = nc->ping_int*HZ; |
44ed167d | 1046 | timeout = nc->timeout * HZ / 10; |
08b165ba | 1047 | discard_my_data = nc->discard_my_data; |
44ed167d | 1048 | rcu_read_unlock(); |
b411b363 | 1049 | |
7da35862 | 1050 | msock.socket->sk->sk_sndtimeo = timeout; |
b411b363 PR |
1051 | |
1052 | /* we don't want delays. | |
25985edc | 1053 | * we use TCP_CORK where appropriate, though */ |
12abc5ee CH |
1054 | tcp_sock_set_nodelay(sock.socket->sk); |
1055 | tcp_sock_set_nodelay(msock.socket->sk); | |
b411b363 | 1056 | |
bde89a9e AG |
1057 | connection->data.socket = sock.socket; |
1058 | connection->meta.socket = msock.socket; | |
1059 | connection->last_received = jiffies; | |
b411b363 | 1060 | |
bde89a9e | 1061 | h = drbd_do_features(connection); |
b411b363 PR |
1062 | if (h <= 0) |
1063 | return h; | |
1064 | ||
bde89a9e | 1065 | if (connection->cram_hmac_tfm) { |
b30ab791 | 1066 | /* drbd_request_state(device, NS(conn, WFAuth)); */ |
bde89a9e | 1067 | switch (drbd_do_auth(connection)) { |
b10d96cb | 1068 | case -1: |
1ec861eb | 1069 | drbd_err(connection, "Authentication of peer failed\n"); |
b411b363 | 1070 | return -1; |
b10d96cb | 1071 | case 0: |
1ec861eb | 1072 | drbd_err(connection, "Authentication of peer failed, trying again.\n"); |
b10d96cb | 1073 | return 0; |
b411b363 PR |
1074 | } |
1075 | } | |
1076 | ||
bde89a9e AG |
1077 | connection->data.socket->sk->sk_sndtimeo = timeout; |
1078 | connection->data.socket->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
b411b363 | 1079 | |
bde89a9e | 1080 | if (drbd_send_protocol(connection) == -EOPNOTSUPP) |
7e2455c1 | 1081 | return -1; |
b411b363 | 1082 | |
31007745 PR |
1083 | /* Prevent a race between resync-handshake and |
1084 | * being promoted to Primary. | |
1085 | * | |
1086 | * Grab and release the state mutex, so we know that any current | |
1087 | * drbd_set_role() is finished, and any incoming drbd_set_role | |
1088 | * will see the STATE_SENT flag, and wait for it to be cleared. | |
1089 | */ | |
1090 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) | |
1091 | mutex_lock(peer_device->device->state_mutex); | |
1092 | ||
cde81d99 LE |
1093 | /* avoid a race with conn_request_state( C_DISCONNECTING ) */ |
1094 | spin_lock_irq(&connection->resource->req_lock); | |
bde89a9e | 1095 | set_bit(STATE_SENT, &connection->flags); |
cde81d99 | 1096 | spin_unlock_irq(&connection->resource->req_lock); |
a1096a6e | 1097 | |
31007745 PR |
1098 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) |
1099 | mutex_unlock(peer_device->device->state_mutex); | |
1100 | ||
c141ebda | 1101 | rcu_read_lock(); |
c06ece6b AG |
1102 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
1103 | struct drbd_device *device = peer_device->device; | |
b30ab791 | 1104 | kref_get(&device->kref); |
26ea8f92 AG |
1105 | rcu_read_unlock(); |
1106 | ||
08b165ba | 1107 | if (discard_my_data) |
b30ab791 | 1108 | set_bit(DISCARD_MY_DATA, &device->flags); |
08b165ba | 1109 | else |
b30ab791 | 1110 | clear_bit(DISCARD_MY_DATA, &device->flags); |
08b165ba | 1111 | |
69a22773 | 1112 | drbd_connected(peer_device); |
05a10ec7 | 1113 | kref_put(&device->kref, drbd_destroy_device); |
c141ebda PR |
1114 | rcu_read_lock(); |
1115 | } | |
1116 | rcu_read_unlock(); | |
1117 | ||
bde89a9e AG |
1118 | rv = conn_request_state(connection, NS(conn, C_WF_REPORT_PARAMS), CS_VERBOSE); |
1119 | if (rv < SS_SUCCESS || connection->cstate != C_WF_REPORT_PARAMS) { | |
1120 | clear_bit(STATE_SENT, &connection->flags); | |
1e86ac48 | 1121 | return 0; |
a1096a6e | 1122 | } |
1e86ac48 | 1123 | |
1c03e520 | 1124 | drbd_thread_start(&connection->ack_receiver); |
39e91a60 LE |
1125 | /* opencoded create_singlethread_workqueue(), |
1126 | * to be able to use format string arguments */ | |
1127 | connection->ack_sender = | |
1128 | alloc_ordered_workqueue("drbd_as_%s", WQ_MEM_RECLAIM, connection->resource->name); | |
668700b4 PR |
1129 | if (!connection->ack_sender) { |
1130 | drbd_err(connection, "Failed to create workqueue ack_sender\n"); | |
1131 | return 0; | |
1132 | } | |
b411b363 | 1133 | |
0500813f | 1134 | mutex_lock(&connection->resource->conf_update); |
08b165ba PR |
1135 | /* The discard_my_data flag is a single-shot modifier to the next |
1136 | * connection attempt, the handshake of which is now well underway. | |
1137 | * No need for rcu style copying of the whole struct | |
1138 | * just to clear a single value. */ | |
bde89a9e | 1139 | connection->net_conf->discard_my_data = 0; |
0500813f | 1140 | mutex_unlock(&connection->resource->conf_update); |
08b165ba | 1141 | |
d3fcb490 | 1142 | return h; |
b411b363 PR |
1143 | |
1144 | out_release_sockets: | |
7a426fd8 PR |
1145 | if (ad.s_listen) |
1146 | sock_release(ad.s_listen); | |
7da35862 PR |
1147 | if (sock.socket) |
1148 | sock_release(sock.socket); | |
1149 | if (msock.socket) | |
1150 | sock_release(msock.socket); | |
b411b363 PR |
1151 | return -1; |
1152 | } | |
1153 | ||
bde89a9e | 1154 | static int decode_header(struct drbd_connection *connection, void *header, struct packet_info *pi) |
b411b363 | 1155 | { |
bde89a9e | 1156 | unsigned int header_size = drbd_header_size(connection); |
e658983a | 1157 | |
0c8e36d9 AG |
1158 | if (header_size == sizeof(struct p_header100) && |
1159 | *(__be32 *)header == cpu_to_be32(DRBD_MAGIC_100)) { | |
1160 | struct p_header100 *h = header; | |
1161 | if (h->pad != 0) { | |
1ec861eb | 1162 | drbd_err(connection, "Header padding is not zero\n"); |
0c8e36d9 AG |
1163 | return -EINVAL; |
1164 | } | |
1165 | pi->vnr = be16_to_cpu(h->volume); | |
1166 | pi->cmd = be16_to_cpu(h->command); | |
1167 | pi->size = be32_to_cpu(h->length); | |
1168 | } else if (header_size == sizeof(struct p_header95) && | |
1169 | *(__be16 *)header == cpu_to_be16(DRBD_MAGIC_BIG)) { | |
e658983a | 1170 | struct p_header95 *h = header; |
e658983a | 1171 | pi->cmd = be16_to_cpu(h->command); |
b55d84ba AG |
1172 | pi->size = be32_to_cpu(h->length); |
1173 | pi->vnr = 0; | |
e658983a AG |
1174 | } else if (header_size == sizeof(struct p_header80) && |
1175 | *(__be32 *)header == cpu_to_be32(DRBD_MAGIC)) { | |
1176 | struct p_header80 *h = header; | |
1177 | pi->cmd = be16_to_cpu(h->command); | |
1178 | pi->size = be16_to_cpu(h->length); | |
77351055 | 1179 | pi->vnr = 0; |
02918be2 | 1180 | } else { |
1ec861eb | 1181 | drbd_err(connection, "Wrong magic value 0x%08x in protocol version %d\n", |
e658983a | 1182 | be32_to_cpu(*(__be32 *)header), |
bde89a9e | 1183 | connection->agreed_pro_version); |
8172f3e9 | 1184 | return -EINVAL; |
b411b363 | 1185 | } |
e658983a | 1186 | pi->data = header + header_size; |
8172f3e9 | 1187 | return 0; |
257d0af6 | 1188 | } |
b411b363 | 1189 | |
c51a0ef3 LE |
1190 | static void drbd_unplug_all_devices(struct drbd_connection *connection) |
1191 | { | |
1192 | if (current->plug == &connection->receiver_plug) { | |
1193 | blk_finish_plug(&connection->receiver_plug); | |
1194 | blk_start_plug(&connection->receiver_plug); | |
1195 | } /* else: maybe just schedule() ?? */ | |
1196 | } | |
1197 | ||
bde89a9e | 1198 | static int drbd_recv_header(struct drbd_connection *connection, struct packet_info *pi) |
257d0af6 | 1199 | { |
bde89a9e | 1200 | void *buffer = connection->data.rbuf; |
69bc7bc3 | 1201 | int err; |
257d0af6 | 1202 | |
bde89a9e | 1203 | err = drbd_recv_all_warn(connection, buffer, drbd_header_size(connection)); |
a5c31904 | 1204 | if (err) |
69bc7bc3 | 1205 | return err; |
257d0af6 | 1206 | |
bde89a9e AG |
1207 | err = decode_header(connection, buffer, pi); |
1208 | connection->last_received = jiffies; | |
b411b363 | 1209 | |
69bc7bc3 | 1210 | return err; |
b411b363 PR |
1211 | } |
1212 | ||
c51a0ef3 LE |
1213 | static int drbd_recv_header_maybe_unplug(struct drbd_connection *connection, struct packet_info *pi) |
1214 | { | |
1215 | void *buffer = connection->data.rbuf; | |
1216 | unsigned int size = drbd_header_size(connection); | |
1217 | int err; | |
1218 | ||
1219 | err = drbd_recv_short(connection->data.socket, buffer, size, MSG_NOSIGNAL|MSG_DONTWAIT); | |
1220 | if (err != size) { | |
1221 | /* If we have nothing in the receive buffer now, to reduce | |
1222 | * application latency, try to drain the backend queues as | |
1223 | * quickly as possible, and let remote TCP know what we have | |
1224 | * received so far. */ | |
1225 | if (err == -EAGAIN) { | |
ddd061b8 | 1226 | tcp_sock_set_quickack(connection->data.socket->sk, 2); |
c51a0ef3 LE |
1227 | drbd_unplug_all_devices(connection); |
1228 | } | |
1229 | if (err > 0) { | |
1230 | buffer += err; | |
1231 | size -= err; | |
1232 | } | |
1233 | err = drbd_recv_all_warn(connection, buffer, size); | |
1234 | if (err) | |
1235 | return err; | |
1236 | } | |
1237 | ||
1238 | err = decode_header(connection, connection->data.rbuf, pi); | |
1239 | connection->last_received = jiffies; | |
1240 | ||
1241 | return err; | |
1242 | } | |
f9ff0da5 LE |
1243 | /* This is blkdev_issue_flush, but asynchronous. |
1244 | * We want to submit to all component volumes in parallel, | |
1245 | * then wait for all completions. | |
1246 | */ | |
1247 | struct issue_flush_context { | |
1248 | atomic_t pending; | |
1249 | int error; | |
1250 | struct completion done; | |
1251 | }; | |
1252 | struct one_flush_context { | |
1253 | struct drbd_device *device; | |
1254 | struct issue_flush_context *ctx; | |
1255 | }; | |
1256 | ||
1ffa7bfa | 1257 | static void one_flush_endio(struct bio *bio) |
b411b363 | 1258 | { |
f9ff0da5 LE |
1259 | struct one_flush_context *octx = bio->bi_private; |
1260 | struct drbd_device *device = octx->device; | |
1261 | struct issue_flush_context *ctx = octx->ctx; | |
1262 | ||
4e4cbee9 CH |
1263 | if (bio->bi_status) { |
1264 | ctx->error = blk_status_to_errno(bio->bi_status); | |
1265 | drbd_info(device, "local disk FLUSH FAILED with status %d\n", bio->bi_status); | |
f9ff0da5 LE |
1266 | } |
1267 | kfree(octx); | |
1268 | bio_put(bio); | |
1269 | ||
1270 | clear_bit(FLUSH_PENDING, &device->flags); | |
1271 | put_ldev(device); | |
1272 | kref_put(&device->kref, drbd_destroy_device); | |
1273 | ||
1274 | if (atomic_dec_and_test(&ctx->pending)) | |
1275 | complete(&ctx->done); | |
1276 | } | |
1277 | ||
1278 | static void submit_one_flush(struct drbd_device *device, struct issue_flush_context *ctx) | |
1279 | { | |
1280 | struct bio *bio = bio_alloc(GFP_NOIO, 0); | |
1281 | struct one_flush_context *octx = kmalloc(sizeof(*octx), GFP_NOIO); | |
1282 | if (!bio || !octx) { | |
1283 | drbd_warn(device, "Could not allocate a bio, CANNOT ISSUE FLUSH\n"); | |
1284 | /* FIXME: what else can I do now? disconnecting or detaching | |
1285 | * really does not help to improve the state of the world, either. | |
1286 | */ | |
1287 | kfree(octx); | |
1288 | if (bio) | |
1289 | bio_put(bio); | |
1290 | ||
1291 | ctx->error = -ENOMEM; | |
1292 | put_ldev(device); | |
1293 | kref_put(&device->kref, drbd_destroy_device); | |
1294 | return; | |
1295 | } | |
4b0007c0 | 1296 | |
f9ff0da5 LE |
1297 | octx->device = device; |
1298 | octx->ctx = ctx; | |
74d46992 | 1299 | bio_set_dev(bio, device->ldev->backing_bdev); |
f9ff0da5 LE |
1300 | bio->bi_private = octx; |
1301 | bio->bi_end_io = one_flush_endio; | |
70fd7614 | 1302 | bio->bi_opf = REQ_OP_FLUSH | REQ_PREFLUSH; |
f9ff0da5 LE |
1303 | |
1304 | device->flush_jif = jiffies; | |
1305 | set_bit(FLUSH_PENDING, &device->flags); | |
1306 | atomic_inc(&ctx->pending); | |
1307 | submit_bio(bio); | |
1308 | } | |
1309 | ||
1310 | static void drbd_flush(struct drbd_connection *connection) | |
1311 | { | |
f6ba8636 | 1312 | if (connection->resource->write_ordering >= WO_BDEV_FLUSH) { |
f9ff0da5 LE |
1313 | struct drbd_peer_device *peer_device; |
1314 | struct issue_flush_context ctx; | |
1315 | int vnr; | |
1316 | ||
1317 | atomic_set(&ctx.pending, 1); | |
1318 | ctx.error = 0; | |
1319 | init_completion(&ctx.done); | |
1320 | ||
615e087f | 1321 | rcu_read_lock(); |
c06ece6b AG |
1322 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
1323 | struct drbd_device *device = peer_device->device; | |
1324 | ||
b30ab791 | 1325 | if (!get_ldev(device)) |
615e087f | 1326 | continue; |
b30ab791 | 1327 | kref_get(&device->kref); |
615e087f LE |
1328 | rcu_read_unlock(); |
1329 | ||
f9ff0da5 | 1330 | submit_one_flush(device, &ctx); |
b411b363 | 1331 | |
615e087f | 1332 | rcu_read_lock(); |
b411b363 | 1333 | } |
615e087f | 1334 | rcu_read_unlock(); |
f9ff0da5 LE |
1335 | |
1336 | /* Do we want to add a timeout, | |
1337 | * if disk-timeout is set? */ | |
1338 | if (!atomic_dec_and_test(&ctx.pending)) | |
1339 | wait_for_completion(&ctx.done); | |
1340 | ||
1341 | if (ctx.error) { | |
1342 | /* would rather check on EOPNOTSUPP, but that is not reliable. | |
1343 | * don't try again for ANY return value != 0 | |
1344 | * if (rv == -EOPNOTSUPP) */ | |
1345 | /* Any error is already reported by bio_endio callback. */ | |
1346 | drbd_bump_write_ordering(connection->resource, NULL, WO_DRAIN_IO); | |
1347 | } | |
b411b363 | 1348 | } |
b411b363 PR |
1349 | } |
1350 | ||
1351 | /** | |
1352 | * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. | |
b30ab791 | 1353 | * @device: DRBD device. |
b411b363 PR |
1354 | * @epoch: Epoch object. |
1355 | * @ev: Epoch event. | |
1356 | */ | |
bde89a9e | 1357 | static enum finish_epoch drbd_may_finish_epoch(struct drbd_connection *connection, |
b411b363 PR |
1358 | struct drbd_epoch *epoch, |
1359 | enum epoch_event ev) | |
1360 | { | |
2451fc3b | 1361 | int epoch_size; |
b411b363 | 1362 | struct drbd_epoch *next_epoch; |
b411b363 PR |
1363 | enum finish_epoch rv = FE_STILL_LIVE; |
1364 | ||
bde89a9e | 1365 | spin_lock(&connection->epoch_lock); |
b411b363 PR |
1366 | do { |
1367 | next_epoch = NULL; | |
b411b363 PR |
1368 | |
1369 | epoch_size = atomic_read(&epoch->epoch_size); | |
1370 | ||
1371 | switch (ev & ~EV_CLEANUP) { | |
1372 | case EV_PUT: | |
1373 | atomic_dec(&epoch->active); | |
1374 | break; | |
1375 | case EV_GOT_BARRIER_NR: | |
1376 | set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags); | |
b411b363 PR |
1377 | break; |
1378 | case EV_BECAME_LAST: | |
1379 | /* nothing to do*/ | |
1380 | break; | |
1381 | } | |
1382 | ||
b411b363 PR |
1383 | if (epoch_size != 0 && |
1384 | atomic_read(&epoch->active) == 0 && | |
80f9fd55 | 1385 | (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags) || ev & EV_CLEANUP)) { |
b411b363 | 1386 | if (!(ev & EV_CLEANUP)) { |
bde89a9e AG |
1387 | spin_unlock(&connection->epoch_lock); |
1388 | drbd_send_b_ack(epoch->connection, epoch->barrier_nr, epoch_size); | |
1389 | spin_lock(&connection->epoch_lock); | |
b411b363 | 1390 | } |
9ed57dcb LE |
1391 | #if 0 |
1392 | /* FIXME: dec unacked on connection, once we have | |
1393 | * something to count pending connection packets in. */ | |
80f9fd55 | 1394 | if (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) |
bde89a9e | 1395 | dec_unacked(epoch->connection); |
9ed57dcb | 1396 | #endif |
b411b363 | 1397 | |
bde89a9e | 1398 | if (connection->current_epoch != epoch) { |
b411b363 PR |
1399 | next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); |
1400 | list_del(&epoch->list); | |
1401 | ev = EV_BECAME_LAST | (ev & EV_CLEANUP); | |
bde89a9e | 1402 | connection->epochs--; |
b411b363 PR |
1403 | kfree(epoch); |
1404 | ||
1405 | if (rv == FE_STILL_LIVE) | |
1406 | rv = FE_DESTROYED; | |
1407 | } else { | |
1408 | epoch->flags = 0; | |
1409 | atomic_set(&epoch->epoch_size, 0); | |
698f9315 | 1410 | /* atomic_set(&epoch->active, 0); is already zero */ |
b411b363 PR |
1411 | if (rv == FE_STILL_LIVE) |
1412 | rv = FE_RECYCLED; | |
1413 | } | |
1414 | } | |
1415 | ||
1416 | if (!next_epoch) | |
1417 | break; | |
1418 | ||
1419 | epoch = next_epoch; | |
1420 | } while (1); | |
1421 | ||
bde89a9e | 1422 | spin_unlock(&connection->epoch_lock); |
b411b363 | 1423 | |
b411b363 PR |
1424 | return rv; |
1425 | } | |
1426 | ||
8fe39aac PR |
1427 | static enum write_ordering_e |
1428 | max_allowed_wo(struct drbd_backing_dev *bdev, enum write_ordering_e wo) | |
1429 | { | |
1430 | struct disk_conf *dc; | |
1431 | ||
1432 | dc = rcu_dereference(bdev->disk_conf); | |
1433 | ||
f6ba8636 AG |
1434 | if (wo == WO_BDEV_FLUSH && !dc->disk_flushes) |
1435 | wo = WO_DRAIN_IO; | |
1436 | if (wo == WO_DRAIN_IO && !dc->disk_drain) | |
1437 | wo = WO_NONE; | |
8fe39aac PR |
1438 | |
1439 | return wo; | |
1440 | } | |
1441 | ||
b411b363 PR |
1442 | /** |
1443 | * drbd_bump_write_ordering() - Fall back to an other write ordering method | |
bde89a9e | 1444 | * @connection: DRBD connection. |
b411b363 PR |
1445 | * @wo: Write ordering method to try. |
1446 | */ | |
8fe39aac PR |
1447 | void drbd_bump_write_ordering(struct drbd_resource *resource, struct drbd_backing_dev *bdev, |
1448 | enum write_ordering_e wo) | |
b411b363 | 1449 | { |
e9526580 | 1450 | struct drbd_device *device; |
b411b363 | 1451 | enum write_ordering_e pwo; |
4b0007c0 | 1452 | int vnr; |
b411b363 | 1453 | static char *write_ordering_str[] = { |
f6ba8636 AG |
1454 | [WO_NONE] = "none", |
1455 | [WO_DRAIN_IO] = "drain", | |
1456 | [WO_BDEV_FLUSH] = "flush", | |
b411b363 PR |
1457 | }; |
1458 | ||
e9526580 | 1459 | pwo = resource->write_ordering; |
f6ba8636 | 1460 | if (wo != WO_BDEV_FLUSH) |
70df7092 | 1461 | wo = min(pwo, wo); |
daeda1cc | 1462 | rcu_read_lock(); |
e9526580 | 1463 | idr_for_each_entry(&resource->devices, device, vnr) { |
8fe39aac PR |
1464 | if (get_ldev(device)) { |
1465 | wo = max_allowed_wo(device->ldev, wo); | |
1466 | if (device->ldev == bdev) | |
1467 | bdev = NULL; | |
1468 | put_ldev(device); | |
1469 | } | |
4b0007c0 | 1470 | } |
8fe39aac PR |
1471 | |
1472 | if (bdev) | |
1473 | wo = max_allowed_wo(bdev, wo); | |
1474 | ||
70df7092 LE |
1475 | rcu_read_unlock(); |
1476 | ||
e9526580 | 1477 | resource->write_ordering = wo; |
f6ba8636 | 1478 | if (pwo != resource->write_ordering || wo == WO_BDEV_FLUSH) |
e9526580 | 1479 | drbd_info(resource, "Method to ensure write ordering: %s\n", write_ordering_str[resource->write_ordering]); |
b411b363 PR |
1480 | } |
1481 | ||
f31e583a LE |
1482 | /* |
1483 | * Mapping "discard" to ZEROOUT with UNMAP does not work for us: | |
1484 | * Drivers have to "announce" q->limits.max_write_zeroes_sectors, or it | |
1485 | * will directly go to fallback mode, submitting normal writes, and | |
1486 | * never even try to UNMAP. | |
1487 | * | |
1488 | * And dm-thin does not do this (yet), mostly because in general it has | |
1489 | * to assume that "skip_block_zeroing" is set. See also: | |
1490 | * https://www.mail-archive.com/dm-devel%40redhat.com/msg07965.html | |
1491 | * https://www.redhat.com/archives/dm-devel/2018-January/msg00271.html | |
1492 | * | |
1493 | * We *may* ignore the discard-zeroes-data setting, if so configured. | |
1494 | * | |
1495 | * Assumption is that this "discard_zeroes_data=0" is only because the backend | |
1496 | * may ignore partial unaligned discards. | |
1497 | * | |
1498 | * LVM/DM thin as of at least | |
1499 | * LVM version: 2.02.115(2)-RHEL7 (2015-01-28) | |
1500 | * Library version: 1.02.93-RHEL7 (2015-01-28) | |
1501 | * Driver version: 4.29.0 | |
1502 | * still behaves this way. | |
1503 | * | |
1504 | * For unaligned (wrt. alignment and granularity) or too small discards, | |
1505 | * we zero-out the initial (and/or) trailing unaligned partial chunks, | |
1506 | * but discard all the aligned full chunks. | |
1507 | * | |
1508 | * At least for LVM/DM thin, with skip_block_zeroing=false, | |
1509 | * the result is effectively "discard_zeroes_data=1". | |
1510 | */ | |
1511 | /* flags: EE_TRIM|EE_ZEROOUT */ | |
1512 | int drbd_issue_discard_or_zero_out(struct drbd_device *device, sector_t start, unsigned int nr_sectors, int flags) | |
dd4f699d LE |
1513 | { |
1514 | struct block_device *bdev = device->ldev->backing_bdev; | |
f31e583a LE |
1515 | struct request_queue *q = bdev_get_queue(bdev); |
1516 | sector_t tmp, nr; | |
1517 | unsigned int max_discard_sectors, granularity; | |
1518 | int alignment; | |
1519 | int err = 0; | |
dd4f699d | 1520 | |
f31e583a LE |
1521 | if ((flags & EE_ZEROOUT) || !(flags & EE_TRIM)) |
1522 | goto zero_out; | |
1523 | ||
1524 | /* Zero-sector (unknown) and one-sector granularities are the same. */ | |
1525 | granularity = max(q->limits.discard_granularity >> 9, 1U); | |
1526 | alignment = (bdev_discard_alignment(bdev) >> 9) % granularity; | |
1527 | ||
1528 | max_discard_sectors = min(q->limits.max_discard_sectors, (1U << 22)); | |
1529 | max_discard_sectors -= max_discard_sectors % granularity; | |
1530 | if (unlikely(!max_discard_sectors)) | |
1531 | goto zero_out; | |
1532 | ||
1533 | if (nr_sectors < granularity) | |
1534 | goto zero_out; | |
1535 | ||
1536 | tmp = start; | |
1537 | if (sector_div(tmp, granularity) != alignment) { | |
1538 | if (nr_sectors < 2*granularity) | |
1539 | goto zero_out; | |
1540 | /* start + gran - (start + gran - align) % gran */ | |
1541 | tmp = start + granularity - alignment; | |
1542 | tmp = start + granularity - sector_div(tmp, granularity); | |
1543 | ||
1544 | nr = tmp - start; | |
1545 | /* don't flag BLKDEV_ZERO_NOUNMAP, we don't know how many | |
1546 | * layers are below us, some may have smaller granularity */ | |
1547 | err |= blkdev_issue_zeroout(bdev, start, nr, GFP_NOIO, 0); | |
1548 | nr_sectors -= nr; | |
1549 | start = tmp; | |
1550 | } | |
1551 | while (nr_sectors >= max_discard_sectors) { | |
1552 | err |= blkdev_issue_discard(bdev, start, max_discard_sectors, GFP_NOIO, 0); | |
1553 | nr_sectors -= max_discard_sectors; | |
1554 | start += max_discard_sectors; | |
1555 | } | |
1556 | if (nr_sectors) { | |
1557 | /* max_discard_sectors is unsigned int (and a multiple of | |
1558 | * granularity, we made sure of that above already); | |
1559 | * nr is < max_discard_sectors; | |
1560 | * I don't need sector_div here, even though nr is sector_t */ | |
1561 | nr = nr_sectors; | |
1562 | nr -= (unsigned int)nr % granularity; | |
1563 | if (nr) { | |
1564 | err |= blkdev_issue_discard(bdev, start, nr, GFP_NOIO, 0); | |
1565 | nr_sectors -= nr; | |
1566 | start += nr; | |
1567 | } | |
1568 | } | |
1569 | zero_out: | |
1570 | if (nr_sectors) { | |
1571 | err |= blkdev_issue_zeroout(bdev, start, nr_sectors, GFP_NOIO, | |
1572 | (flags & EE_TRIM) ? 0 : BLKDEV_ZERO_NOUNMAP); | |
1573 | } | |
1574 | return err != 0; | |
1575 | } | |
0dbed96a | 1576 | |
f31e583a LE |
1577 | static bool can_do_reliable_discards(struct drbd_device *device) |
1578 | { | |
1579 | struct request_queue *q = bdev_get_queue(device->ldev->backing_bdev); | |
1580 | struct disk_conf *dc; | |
1581 | bool can_do; | |
0dbed96a | 1582 | |
f31e583a LE |
1583 | if (!blk_queue_discard(q)) |
1584 | return false; | |
1585 | ||
1586 | rcu_read_lock(); | |
1587 | dc = rcu_dereference(device->ldev->disk_conf); | |
1588 | can_do = dc->discard_zeroes_if_aligned; | |
1589 | rcu_read_unlock(); | |
1590 | return can_do; | |
1591 | } | |
1592 | ||
1593 | static void drbd_issue_peer_discard_or_zero_out(struct drbd_device *device, struct drbd_peer_request *peer_req) | |
1594 | { | |
1595 | /* If the backend cannot discard, or does not guarantee | |
1596 | * read-back zeroes in discarded ranges, we fall back to | |
1597 | * zero-out. Unless configuration specifically requested | |
1598 | * otherwise. */ | |
1599 | if (!can_do_reliable_discards(device)) | |
1600 | peer_req->flags |= EE_ZEROOUT; | |
1601 | ||
1602 | if (drbd_issue_discard_or_zero_out(device, peer_req->i.sector, | |
1603 | peer_req->i.size >> 9, peer_req->flags & (EE_ZEROOUT|EE_TRIM))) | |
1604 | peer_req->flags |= EE_WAS_ERROR; | |
dd4f699d LE |
1605 | drbd_endio_write_sec_final(peer_req); |
1606 | } | |
1607 | ||
9104d31a LE |
1608 | static void drbd_issue_peer_wsame(struct drbd_device *device, |
1609 | struct drbd_peer_request *peer_req) | |
1610 | { | |
1611 | struct block_device *bdev = device->ldev->backing_bdev; | |
1612 | sector_t s = peer_req->i.sector; | |
1613 | sector_t nr = peer_req->i.size >> 9; | |
1614 | if (blkdev_issue_write_same(bdev, s, nr, GFP_NOIO, peer_req->pages)) | |
1615 | peer_req->flags |= EE_WAS_ERROR; | |
1616 | drbd_endio_write_sec_final(peer_req); | |
1617 | } | |
1618 | ||
1619 | ||
45bb912b | 1620 | /** |
fbe29dec | 1621 | * drbd_submit_peer_request() |
b30ab791 | 1622 | * @device: DRBD device. |
db830c46 | 1623 | * @peer_req: peer request |
1eff9d32 | 1624 | * @rw: flag field, see bio->bi_opf |
10f6d992 LE |
1625 | * |
1626 | * May spread the pages to multiple bios, | |
1627 | * depending on bio_add_page restrictions. | |
1628 | * | |
1629 | * Returns 0 if all bios have been submitted, | |
1630 | * -ENOMEM if we could not allocate enough bios, | |
1631 | * -ENOSPC (any better suggestion?) if we have not been able to bio_add_page a | |
1632 | * single page to an empty bio (which should never happen and likely indicates | |
1633 | * that the lower level IO stack is in some way broken). This has been observed | |
1634 | * on certain Xen deployments. | |
45bb912b LE |
1635 | */ |
1636 | /* TODO allocate from our own bio_set. */ | |
b30ab791 | 1637 | int drbd_submit_peer_request(struct drbd_device *device, |
fbe29dec | 1638 | struct drbd_peer_request *peer_req, |
bb3cc85e MC |
1639 | const unsigned op, const unsigned op_flags, |
1640 | const int fault_type) | |
45bb912b LE |
1641 | { |
1642 | struct bio *bios = NULL; | |
1643 | struct bio *bio; | |
db830c46 AG |
1644 | struct page *page = peer_req->pages; |
1645 | sector_t sector = peer_req->i.sector; | |
11f8b2b6 | 1646 | unsigned data_size = peer_req->i.size; |
45bb912b | 1647 | unsigned n_bios = 0; |
11f8b2b6 | 1648 | unsigned nr_pages = (data_size + PAGE_SIZE -1) >> PAGE_SHIFT; |
10f6d992 | 1649 | int err = -ENOMEM; |
45bb912b | 1650 | |
dd4f699d LE |
1651 | /* TRIM/DISCARD: for now, always use the helper function |
1652 | * blkdev_issue_zeroout(..., discard=true). | |
1653 | * It's synchronous, but it does the right thing wrt. bio splitting. | |
1654 | * Correctness first, performance later. Next step is to code an | |
1655 | * asynchronous variant of the same. | |
1656 | */ | |
f31e583a | 1657 | if (peer_req->flags & (EE_TRIM|EE_WRITE_SAME|EE_ZEROOUT)) { |
a0fb3c47 LE |
1658 | /* wait for all pending IO completions, before we start |
1659 | * zeroing things out. */ | |
5dd2ca19 | 1660 | conn_wait_active_ee_empty(peer_req->peer_device->connection); |
45d2933c LE |
1661 | /* add it to the active list now, |
1662 | * so we can find it to present it in debugfs */ | |
21ae5d7f LE |
1663 | peer_req->submit_jif = jiffies; |
1664 | peer_req->flags |= EE_SUBMITTED; | |
700ca8c0 PR |
1665 | |
1666 | /* If this was a resync request from receive_rs_deallocated(), | |
1667 | * it is already on the sync_ee list */ | |
1668 | if (list_empty(&peer_req->w.list)) { | |
1669 | spin_lock_irq(&device->resource->req_lock); | |
1670 | list_add_tail(&peer_req->w.list, &device->active_ee); | |
1671 | spin_unlock_irq(&device->resource->req_lock); | |
1672 | } | |
1673 | ||
f31e583a LE |
1674 | if (peer_req->flags & (EE_TRIM|EE_ZEROOUT)) |
1675 | drbd_issue_peer_discard_or_zero_out(device, peer_req); | |
9104d31a LE |
1676 | else /* EE_WRITE_SAME */ |
1677 | drbd_issue_peer_wsame(device, peer_req); | |
a0fb3c47 LE |
1678 | return 0; |
1679 | } | |
1680 | ||
45bb912b LE |
1681 | /* In most cases, we will only need one bio. But in case the lower |
1682 | * level restrictions happen to be different at this offset on this | |
1683 | * side than those of the sending peer, we may need to submit the | |
9476f39d LE |
1684 | * request in more than one bio. |
1685 | * | |
1686 | * Plain bio_alloc is good enough here, this is no DRBD internally | |
1687 | * generated bio, but a bio allocated on behalf of the peer. | |
1688 | */ | |
45bb912b LE |
1689 | next_bio: |
1690 | bio = bio_alloc(GFP_NOIO, nr_pages); | |
1691 | if (!bio) { | |
a0fb3c47 | 1692 | drbd_err(device, "submit_ee: Allocation of a bio failed (nr_pages=%u)\n", nr_pages); |
45bb912b LE |
1693 | goto fail; |
1694 | } | |
db830c46 | 1695 | /* > peer_req->i.sector, unless this is the first bio */ |
4f024f37 | 1696 | bio->bi_iter.bi_sector = sector; |
74d46992 | 1697 | bio_set_dev(bio, device->ldev->backing_bdev); |
bb3cc85e | 1698 | bio_set_op_attrs(bio, op, op_flags); |
db830c46 | 1699 | bio->bi_private = peer_req; |
fcefa62e | 1700 | bio->bi_end_io = drbd_peer_request_endio; |
45bb912b LE |
1701 | |
1702 | bio->bi_next = bios; | |
1703 | bios = bio; | |
1704 | ++n_bios; | |
1705 | ||
1706 | page_chain_for_each(page) { | |
11f8b2b6 | 1707 | unsigned len = min_t(unsigned, data_size, PAGE_SIZE); |
06efffda | 1708 | if (!bio_add_page(bio, page, len, 0)) |
45bb912b | 1709 | goto next_bio; |
11f8b2b6 | 1710 | data_size -= len; |
45bb912b LE |
1711 | sector += len >> 9; |
1712 | --nr_pages; | |
1713 | } | |
11f8b2b6 | 1714 | D_ASSERT(device, data_size == 0); |
a0fb3c47 | 1715 | D_ASSERT(device, page == NULL); |
45bb912b | 1716 | |
db830c46 | 1717 | atomic_set(&peer_req->pending_bios, n_bios); |
21ae5d7f LE |
1718 | /* for debugfs: update timestamp, mark as submitted */ |
1719 | peer_req->submit_jif = jiffies; | |
1720 | peer_req->flags |= EE_SUBMITTED; | |
45bb912b LE |
1721 | do { |
1722 | bio = bios; | |
1723 | bios = bios->bi_next; | |
1724 | bio->bi_next = NULL; | |
1725 | ||
ed00aabd | 1726 | drbd_submit_bio_noacct(device, fault_type, bio); |
45bb912b | 1727 | } while (bios); |
45bb912b LE |
1728 | return 0; |
1729 | ||
1730 | fail: | |
1731 | while (bios) { | |
1732 | bio = bios; | |
1733 | bios = bios->bi_next; | |
1734 | bio_put(bio); | |
1735 | } | |
10f6d992 | 1736 | return err; |
45bb912b LE |
1737 | } |
1738 | ||
b30ab791 | 1739 | static void drbd_remove_epoch_entry_interval(struct drbd_device *device, |
db830c46 | 1740 | struct drbd_peer_request *peer_req) |
53840641 | 1741 | { |
db830c46 | 1742 | struct drbd_interval *i = &peer_req->i; |
53840641 | 1743 | |
b30ab791 | 1744 | drbd_remove_interval(&device->write_requests, i); |
53840641 AG |
1745 | drbd_clear_interval(i); |
1746 | ||
6c852bec | 1747 | /* Wake up any processes waiting for this peer request to complete. */ |
53840641 | 1748 | if (i->waiting) |
b30ab791 | 1749 | wake_up(&device->misc_wait); |
53840641 AG |
1750 | } |
1751 | ||
bde89a9e | 1752 | static void conn_wait_active_ee_empty(struct drbd_connection *connection) |
77fede51 | 1753 | { |
c06ece6b | 1754 | struct drbd_peer_device *peer_device; |
77fede51 PR |
1755 | int vnr; |
1756 | ||
1757 | rcu_read_lock(); | |
c06ece6b AG |
1758 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
1759 | struct drbd_device *device = peer_device->device; | |
1760 | ||
b30ab791 | 1761 | kref_get(&device->kref); |
77fede51 | 1762 | rcu_read_unlock(); |
b30ab791 | 1763 | drbd_wait_ee_list_empty(device, &device->active_ee); |
05a10ec7 | 1764 | kref_put(&device->kref, drbd_destroy_device); |
77fede51 PR |
1765 | rcu_read_lock(); |
1766 | } | |
1767 | rcu_read_unlock(); | |
1768 | } | |
1769 | ||
bde89a9e | 1770 | static int receive_Barrier(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 1771 | { |
2451fc3b | 1772 | int rv; |
e658983a | 1773 | struct p_barrier *p = pi->data; |
b411b363 PR |
1774 | struct drbd_epoch *epoch; |
1775 | ||
9ed57dcb LE |
1776 | /* FIXME these are unacked on connection, |
1777 | * not a specific (peer)device. | |
1778 | */ | |
bde89a9e AG |
1779 | connection->current_epoch->barrier_nr = p->barrier; |
1780 | connection->current_epoch->connection = connection; | |
1781 | rv = drbd_may_finish_epoch(connection, connection->current_epoch, EV_GOT_BARRIER_NR); | |
b411b363 PR |
1782 | |
1783 | /* P_BARRIER_ACK may imply that the corresponding extent is dropped from | |
1784 | * the activity log, which means it would not be resynced in case the | |
1785 | * R_PRIMARY crashes now. | |
1786 | * Therefore we must send the barrier_ack after the barrier request was | |
1787 | * completed. */ | |
e9526580 | 1788 | switch (connection->resource->write_ordering) { |
f6ba8636 | 1789 | case WO_NONE: |
b411b363 | 1790 | if (rv == FE_RECYCLED) |
82bc0194 | 1791 | return 0; |
2451fc3b PR |
1792 | |
1793 | /* receiver context, in the writeout path of the other node. | |
1794 | * avoid potential distributed deadlock */ | |
1795 | epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); | |
1796 | if (epoch) | |
1797 | break; | |
1798 | else | |
1ec861eb | 1799 | drbd_warn(connection, "Allocation of an epoch failed, slowing down\n"); |
df561f66 | 1800 | fallthrough; |
b411b363 | 1801 | |
f6ba8636 AG |
1802 | case WO_BDEV_FLUSH: |
1803 | case WO_DRAIN_IO: | |
bde89a9e AG |
1804 | conn_wait_active_ee_empty(connection); |
1805 | drbd_flush(connection); | |
2451fc3b | 1806 | |
bde89a9e | 1807 | if (atomic_read(&connection->current_epoch->epoch_size)) { |
2451fc3b PR |
1808 | epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO); |
1809 | if (epoch) | |
1810 | break; | |
b411b363 PR |
1811 | } |
1812 | ||
82bc0194 | 1813 | return 0; |
2451fc3b | 1814 | default: |
e9526580 PR |
1815 | drbd_err(connection, "Strangeness in connection->write_ordering %d\n", |
1816 | connection->resource->write_ordering); | |
82bc0194 | 1817 | return -EIO; |
b411b363 PR |
1818 | } |
1819 | ||
1820 | epoch->flags = 0; | |
1821 | atomic_set(&epoch->epoch_size, 0); | |
1822 | atomic_set(&epoch->active, 0); | |
1823 | ||
bde89a9e AG |
1824 | spin_lock(&connection->epoch_lock); |
1825 | if (atomic_read(&connection->current_epoch->epoch_size)) { | |
1826 | list_add(&epoch->list, &connection->current_epoch->list); | |
1827 | connection->current_epoch = epoch; | |
1828 | connection->epochs++; | |
b411b363 PR |
1829 | } else { |
1830 | /* The current_epoch got recycled while we allocated this one... */ | |
1831 | kfree(epoch); | |
1832 | } | |
bde89a9e | 1833 | spin_unlock(&connection->epoch_lock); |
b411b363 | 1834 | |
82bc0194 | 1835 | return 0; |
b411b363 PR |
1836 | } |
1837 | ||
9104d31a | 1838 | /* quick wrapper in case payload size != request_size (write same) */ |
3d0e6375 | 1839 | static void drbd_csum_ee_size(struct crypto_shash *h, |
9104d31a LE |
1840 | struct drbd_peer_request *r, void *d, |
1841 | unsigned int payload_size) | |
1842 | { | |
1843 | unsigned int tmp = r->i.size; | |
1844 | r->i.size = payload_size; | |
1845 | drbd_csum_ee(h, r, d); | |
1846 | r->i.size = tmp; | |
1847 | } | |
1848 | ||
b411b363 | 1849 | /* used from receive_RSDataReply (recv_resync_read) |
9104d31a LE |
1850 | * and from receive_Data. |
1851 | * data_size: actual payload ("data in") | |
1852 | * for normal writes that is bi_size. | |
1853 | * for discards, that is zero. | |
1854 | * for write same, it is logical_block_size. | |
1855 | * both trim and write same have the bi_size ("data len to be affected") | |
1856 | * as extra argument in the packet header. | |
1857 | */ | |
f6ffca9f | 1858 | static struct drbd_peer_request * |
69a22773 | 1859 | read_in_block(struct drbd_peer_device *peer_device, u64 id, sector_t sector, |
a0fb3c47 | 1860 | struct packet_info *pi) __must_hold(local) |
b411b363 | 1861 | { |
69a22773 | 1862 | struct drbd_device *device = peer_device->device; |
b30ab791 | 1863 | const sector_t capacity = drbd_get_capacity(device->this_bdev); |
db830c46 | 1864 | struct drbd_peer_request *peer_req; |
b411b363 | 1865 | struct page *page; |
11f8b2b6 AG |
1866 | int digest_size, err; |
1867 | unsigned int data_size = pi->size, ds; | |
69a22773 AG |
1868 | void *dig_in = peer_device->connection->int_dig_in; |
1869 | void *dig_vv = peer_device->connection->int_dig_vv; | |
6b4388ac | 1870 | unsigned long *data; |
a0fb3c47 | 1871 | struct p_trim *trim = (pi->cmd == P_TRIM) ? pi->data : NULL; |
f31e583a | 1872 | struct p_trim *zeroes = (pi->cmd == P_ZEROES) ? pi->data : NULL; |
9104d31a | 1873 | struct p_trim *wsame = (pi->cmd == P_WSAME) ? pi->data : NULL; |
b411b363 | 1874 | |
11f8b2b6 | 1875 | digest_size = 0; |
a0fb3c47 | 1876 | if (!trim && peer_device->connection->peer_integrity_tfm) { |
3d0e6375 | 1877 | digest_size = crypto_shash_digestsize(peer_device->connection->peer_integrity_tfm); |
9f5bdc33 AG |
1878 | /* |
1879 | * FIXME: Receive the incoming digest into the receive buffer | |
1880 | * here, together with its struct p_data? | |
1881 | */ | |
11f8b2b6 | 1882 | err = drbd_recv_all_warn(peer_device->connection, dig_in, digest_size); |
a5c31904 | 1883 | if (err) |
b411b363 | 1884 | return NULL; |
11f8b2b6 | 1885 | data_size -= digest_size; |
b411b363 PR |
1886 | } |
1887 | ||
9104d31a LE |
1888 | /* assume request_size == data_size, but special case trim and wsame. */ |
1889 | ds = data_size; | |
a0fb3c47 | 1890 | if (trim) { |
9104d31a LE |
1891 | if (!expect(data_size == 0)) |
1892 | return NULL; | |
1893 | ds = be32_to_cpu(trim->size); | |
f31e583a LE |
1894 | } else if (zeroes) { |
1895 | if (!expect(data_size == 0)) | |
1896 | return NULL; | |
1897 | ds = be32_to_cpu(zeroes->size); | |
9104d31a LE |
1898 | } else if (wsame) { |
1899 | if (data_size != queue_logical_block_size(device->rq_queue)) { | |
1900 | drbd_err(peer_device, "data size (%u) != drbd logical block size (%u)\n", | |
1901 | data_size, queue_logical_block_size(device->rq_queue)); | |
1902 | return NULL; | |
1903 | } | |
1904 | if (data_size != bdev_logical_block_size(device->ldev->backing_bdev)) { | |
1905 | drbd_err(peer_device, "data size (%u) != backend logical block size (%u)\n", | |
1906 | data_size, bdev_logical_block_size(device->ldev->backing_bdev)); | |
1907 | return NULL; | |
1908 | } | |
1909 | ds = be32_to_cpu(wsame->size); | |
a0fb3c47 LE |
1910 | } |
1911 | ||
9104d31a | 1912 | if (!expect(IS_ALIGNED(ds, 512))) |
841ce241 | 1913 | return NULL; |
f31e583a | 1914 | if (trim || wsame || zeroes) { |
9104d31a LE |
1915 | if (!expect(ds <= (DRBD_MAX_BBIO_SECTORS << 9))) |
1916 | return NULL; | |
1917 | } else if (!expect(ds <= DRBD_MAX_BIO_SIZE)) | |
841ce241 | 1918 | return NULL; |
b411b363 | 1919 | |
6666032a LE |
1920 | /* even though we trust out peer, |
1921 | * we sometimes have to double check. */ | |
9104d31a | 1922 | if (sector + (ds>>9) > capacity) { |
d0180171 | 1923 | drbd_err(device, "request from peer beyond end of local disk: " |
fdda6544 | 1924 | "capacity: %llus < sector: %llus + size: %u\n", |
6666032a | 1925 | (unsigned long long)capacity, |
9104d31a | 1926 | (unsigned long long)sector, ds); |
6666032a LE |
1927 | return NULL; |
1928 | } | |
1929 | ||
b411b363 PR |
1930 | /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD |
1931 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
1932 | * which in turn might block on the other node at this very place. */ | |
9104d31a | 1933 | peer_req = drbd_alloc_peer_req(peer_device, id, sector, ds, data_size, GFP_NOIO); |
db830c46 | 1934 | if (!peer_req) |
b411b363 | 1935 | return NULL; |
45bb912b | 1936 | |
21ae5d7f | 1937 | peer_req->flags |= EE_WRITE; |
9104d31a | 1938 | if (trim) { |
f31e583a LE |
1939 | peer_req->flags |= EE_TRIM; |
1940 | return peer_req; | |
1941 | } | |
1942 | if (zeroes) { | |
1943 | peer_req->flags |= EE_ZEROOUT; | |
81a3537a | 1944 | return peer_req; |
9104d31a LE |
1945 | } |
1946 | if (wsame) | |
1947 | peer_req->flags |= EE_WRITE_SAME; | |
a73ff323 | 1948 | |
9104d31a | 1949 | /* receive payload size bytes into page chain */ |
b411b363 | 1950 | ds = data_size; |
db830c46 | 1951 | page = peer_req->pages; |
45bb912b LE |
1952 | page_chain_for_each(page) { |
1953 | unsigned len = min_t(int, ds, PAGE_SIZE); | |
6b4388ac | 1954 | data = kmap(page); |
69a22773 | 1955 | err = drbd_recv_all_warn(peer_device->connection, data, len); |
b30ab791 | 1956 | if (drbd_insert_fault(device, DRBD_FAULT_RECEIVE)) { |
d0180171 | 1957 | drbd_err(device, "Fault injection: Corrupting data on receive\n"); |
6b4388ac PR |
1958 | data[0] = data[0] ^ (unsigned long)-1; |
1959 | } | |
b411b363 | 1960 | kunmap(page); |
a5c31904 | 1961 | if (err) { |
b30ab791 | 1962 | drbd_free_peer_req(device, peer_req); |
b411b363 PR |
1963 | return NULL; |
1964 | } | |
a5c31904 | 1965 | ds -= len; |
b411b363 PR |
1966 | } |
1967 | ||
11f8b2b6 | 1968 | if (digest_size) { |
9104d31a | 1969 | drbd_csum_ee_size(peer_device->connection->peer_integrity_tfm, peer_req, dig_vv, data_size); |
11f8b2b6 | 1970 | if (memcmp(dig_in, dig_vv, digest_size)) { |
d0180171 | 1971 | drbd_err(device, "Digest integrity check FAILED: %llus +%u\n", |
470be44a | 1972 | (unsigned long long)sector, data_size); |
b30ab791 | 1973 | drbd_free_peer_req(device, peer_req); |
b411b363 PR |
1974 | return NULL; |
1975 | } | |
1976 | } | |
11f8b2b6 | 1977 | device->recv_cnt += data_size >> 9; |
db830c46 | 1978 | return peer_req; |
b411b363 PR |
1979 | } |
1980 | ||
1981 | /* drbd_drain_block() just takes a data block | |
1982 | * out of the socket input buffer, and discards it. | |
1983 | */ | |
69a22773 | 1984 | static int drbd_drain_block(struct drbd_peer_device *peer_device, int data_size) |
b411b363 PR |
1985 | { |
1986 | struct page *page; | |
a5c31904 | 1987 | int err = 0; |
b411b363 PR |
1988 | void *data; |
1989 | ||
c3470cde | 1990 | if (!data_size) |
fc5be839 | 1991 | return 0; |
c3470cde | 1992 | |
69a22773 | 1993 | page = drbd_alloc_pages(peer_device, 1, 1); |
b411b363 PR |
1994 | |
1995 | data = kmap(page); | |
1996 | while (data_size) { | |
fc5be839 AG |
1997 | unsigned int len = min_t(int, data_size, PAGE_SIZE); |
1998 | ||
69a22773 | 1999 | err = drbd_recv_all_warn(peer_device->connection, data, len); |
a5c31904 | 2000 | if (err) |
b411b363 | 2001 | break; |
a5c31904 | 2002 | data_size -= len; |
b411b363 PR |
2003 | } |
2004 | kunmap(page); | |
69a22773 | 2005 | drbd_free_pages(peer_device->device, page, 0); |
fc5be839 | 2006 | return err; |
b411b363 PR |
2007 | } |
2008 | ||
69a22773 | 2009 | static int recv_dless_read(struct drbd_peer_device *peer_device, struct drbd_request *req, |
b411b363 PR |
2010 | sector_t sector, int data_size) |
2011 | { | |
7988613b KO |
2012 | struct bio_vec bvec; |
2013 | struct bvec_iter iter; | |
b411b363 | 2014 | struct bio *bio; |
11f8b2b6 | 2015 | int digest_size, err, expect; |
69a22773 AG |
2016 | void *dig_in = peer_device->connection->int_dig_in; |
2017 | void *dig_vv = peer_device->connection->int_dig_vv; | |
b411b363 | 2018 | |
11f8b2b6 | 2019 | digest_size = 0; |
69a22773 | 2020 | if (peer_device->connection->peer_integrity_tfm) { |
3d0e6375 | 2021 | digest_size = crypto_shash_digestsize(peer_device->connection->peer_integrity_tfm); |
11f8b2b6 | 2022 | err = drbd_recv_all_warn(peer_device->connection, dig_in, digest_size); |
a5c31904 AG |
2023 | if (err) |
2024 | return err; | |
11f8b2b6 | 2025 | data_size -= digest_size; |
b411b363 PR |
2026 | } |
2027 | ||
b411b363 PR |
2028 | /* optimistically update recv_cnt. if receiving fails below, |
2029 | * we disconnect anyways, and counters will be reset. */ | |
69a22773 | 2030 | peer_device->device->recv_cnt += data_size>>9; |
b411b363 PR |
2031 | |
2032 | bio = req->master_bio; | |
69a22773 | 2033 | D_ASSERT(peer_device->device, sector == bio->bi_iter.bi_sector); |
b411b363 | 2034 | |
7988613b KO |
2035 | bio_for_each_segment(bvec, bio, iter) { |
2036 | void *mapped = kmap(bvec.bv_page) + bvec.bv_offset; | |
2037 | expect = min_t(int, data_size, bvec.bv_len); | |
69a22773 | 2038 | err = drbd_recv_all_warn(peer_device->connection, mapped, expect); |
7988613b | 2039 | kunmap(bvec.bv_page); |
a5c31904 AG |
2040 | if (err) |
2041 | return err; | |
2042 | data_size -= expect; | |
b411b363 PR |
2043 | } |
2044 | ||
11f8b2b6 | 2045 | if (digest_size) { |
69a22773 | 2046 | drbd_csum_bio(peer_device->connection->peer_integrity_tfm, bio, dig_vv); |
11f8b2b6 | 2047 | if (memcmp(dig_in, dig_vv, digest_size)) { |
69a22773 | 2048 | drbd_err(peer_device, "Digest integrity check FAILED. Broken NICs?\n"); |
28284cef | 2049 | return -EINVAL; |
b411b363 PR |
2050 | } |
2051 | } | |
2052 | ||
69a22773 | 2053 | D_ASSERT(peer_device->device, data_size == 0); |
28284cef | 2054 | return 0; |
b411b363 PR |
2055 | } |
2056 | ||
a990be46 | 2057 | /* |
668700b4 | 2058 | * e_end_resync_block() is called in ack_sender context via |
a990be46 AG |
2059 | * drbd_finish_peer_reqs(). |
2060 | */ | |
99920dc5 | 2061 | static int e_end_resync_block(struct drbd_work *w, int unused) |
b411b363 | 2062 | { |
8050e6d0 | 2063 | struct drbd_peer_request *peer_req = |
a8cd15ba AG |
2064 | container_of(w, struct drbd_peer_request, w); |
2065 | struct drbd_peer_device *peer_device = peer_req->peer_device; | |
2066 | struct drbd_device *device = peer_device->device; | |
db830c46 | 2067 | sector_t sector = peer_req->i.sector; |
99920dc5 | 2068 | int err; |
b411b363 | 2069 | |
0b0ba1ef | 2070 | D_ASSERT(device, drbd_interval_empty(&peer_req->i)); |
b411b363 | 2071 | |
db830c46 | 2072 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
b30ab791 | 2073 | drbd_set_in_sync(device, sector, peer_req->i.size); |
a8cd15ba | 2074 | err = drbd_send_ack(peer_device, P_RS_WRITE_ACK, peer_req); |
b411b363 PR |
2075 | } else { |
2076 | /* Record failure to sync */ | |
b30ab791 | 2077 | drbd_rs_failed_io(device, sector, peer_req->i.size); |
b411b363 | 2078 | |
a8cd15ba | 2079 | err = drbd_send_ack(peer_device, P_NEG_ACK, peer_req); |
b411b363 | 2080 | } |
b30ab791 | 2081 | dec_unacked(device); |
b411b363 | 2082 | |
99920dc5 | 2083 | return err; |
b411b363 PR |
2084 | } |
2085 | ||
69a22773 | 2086 | static int recv_resync_read(struct drbd_peer_device *peer_device, sector_t sector, |
a0fb3c47 | 2087 | struct packet_info *pi) __releases(local) |
b411b363 | 2088 | { |
69a22773 | 2089 | struct drbd_device *device = peer_device->device; |
db830c46 | 2090 | struct drbd_peer_request *peer_req; |
b411b363 | 2091 | |
a0fb3c47 | 2092 | peer_req = read_in_block(peer_device, ID_SYNCER, sector, pi); |
db830c46 | 2093 | if (!peer_req) |
45bb912b | 2094 | goto fail; |
b411b363 | 2095 | |
b30ab791 | 2096 | dec_rs_pending(device); |
b411b363 | 2097 | |
b30ab791 | 2098 | inc_unacked(device); |
b411b363 PR |
2099 | /* corresponding dec_unacked() in e_end_resync_block() |
2100 | * respective _drbd_clear_done_ee */ | |
2101 | ||
a8cd15ba | 2102 | peer_req->w.cb = e_end_resync_block; |
21ae5d7f | 2103 | peer_req->submit_jif = jiffies; |
45bb912b | 2104 | |
0500813f | 2105 | spin_lock_irq(&device->resource->req_lock); |
b9ed7080 | 2106 | list_add_tail(&peer_req->w.list, &device->sync_ee); |
0500813f | 2107 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 | 2108 | |
a0fb3c47 | 2109 | atomic_add(pi->size >> 9, &device->rs_sect_ev); |
bb3cc85e MC |
2110 | if (drbd_submit_peer_request(device, peer_req, REQ_OP_WRITE, 0, |
2111 | DRBD_FAULT_RS_WR) == 0) | |
e1c1b0fc | 2112 | return 0; |
b411b363 | 2113 | |
10f6d992 | 2114 | /* don't care for the reason here */ |
d0180171 | 2115 | drbd_err(device, "submit failed, triggering re-connect\n"); |
0500813f | 2116 | spin_lock_irq(&device->resource->req_lock); |
a8cd15ba | 2117 | list_del(&peer_req->w.list); |
0500813f | 2118 | spin_unlock_irq(&device->resource->req_lock); |
22cc37a9 | 2119 | |
b30ab791 | 2120 | drbd_free_peer_req(device, peer_req); |
45bb912b | 2121 | fail: |
b30ab791 | 2122 | put_ldev(device); |
e1c1b0fc | 2123 | return -EIO; |
b411b363 PR |
2124 | } |
2125 | ||
668eebc6 | 2126 | static struct drbd_request * |
b30ab791 | 2127 | find_request(struct drbd_device *device, struct rb_root *root, u64 id, |
bc9c5c41 | 2128 | sector_t sector, bool missing_ok, const char *func) |
51624585 | 2129 | { |
51624585 AG |
2130 | struct drbd_request *req; |
2131 | ||
bc9c5c41 AG |
2132 | /* Request object according to our peer */ |
2133 | req = (struct drbd_request *)(unsigned long)id; | |
5e472264 | 2134 | if (drbd_contains_interval(root, sector, &req->i) && req->i.local) |
668eebc6 | 2135 | return req; |
c3afd8f5 | 2136 | if (!missing_ok) { |
d0180171 | 2137 | drbd_err(device, "%s: failed to find request 0x%lx, sector %llus\n", func, |
c3afd8f5 AG |
2138 | (unsigned long)id, (unsigned long long)sector); |
2139 | } | |
51624585 | 2140 | return NULL; |
b411b363 PR |
2141 | } |
2142 | ||
bde89a9e | 2143 | static int receive_DataReply(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 2144 | { |
9f4fe9ad | 2145 | struct drbd_peer_device *peer_device; |
b30ab791 | 2146 | struct drbd_device *device; |
b411b363 PR |
2147 | struct drbd_request *req; |
2148 | sector_t sector; | |
82bc0194 | 2149 | int err; |
e658983a | 2150 | struct p_data *p = pi->data; |
4a76b161 | 2151 | |
9f4fe9ad AG |
2152 | peer_device = conn_peer_device(connection, pi->vnr); |
2153 | if (!peer_device) | |
4a76b161 | 2154 | return -EIO; |
9f4fe9ad | 2155 | device = peer_device->device; |
b411b363 PR |
2156 | |
2157 | sector = be64_to_cpu(p->sector); | |
2158 | ||
0500813f | 2159 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 | 2160 | req = find_request(device, &device->read_requests, p->block_id, sector, false, __func__); |
0500813f | 2161 | spin_unlock_irq(&device->resource->req_lock); |
c3afd8f5 | 2162 | if (unlikely(!req)) |
82bc0194 | 2163 | return -EIO; |
b411b363 | 2164 | |
24c4830c | 2165 | /* hlist_del(&req->collision) is done in _req_may_be_done, to avoid |
b411b363 PR |
2166 | * special casing it there for the various failure cases. |
2167 | * still no race with drbd_fail_pending_reads */ | |
69a22773 | 2168 | err = recv_dless_read(peer_device, req, sector, pi->size); |
82bc0194 | 2169 | if (!err) |
8554df1c | 2170 | req_mod(req, DATA_RECEIVED); |
b411b363 PR |
2171 | /* else: nothing. handled from drbd_disconnect... |
2172 | * I don't think we may complete this just yet | |
2173 | * in case we are "on-disconnect: freeze" */ | |
2174 | ||
82bc0194 | 2175 | return err; |
b411b363 PR |
2176 | } |
2177 | ||
bde89a9e | 2178 | static int receive_RSDataReply(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 2179 | { |
9f4fe9ad | 2180 | struct drbd_peer_device *peer_device; |
b30ab791 | 2181 | struct drbd_device *device; |
b411b363 | 2182 | sector_t sector; |
82bc0194 | 2183 | int err; |
e658983a | 2184 | struct p_data *p = pi->data; |
4a76b161 | 2185 | |
9f4fe9ad AG |
2186 | peer_device = conn_peer_device(connection, pi->vnr); |
2187 | if (!peer_device) | |
4a76b161 | 2188 | return -EIO; |
9f4fe9ad | 2189 | device = peer_device->device; |
b411b363 PR |
2190 | |
2191 | sector = be64_to_cpu(p->sector); | |
0b0ba1ef | 2192 | D_ASSERT(device, p->block_id == ID_SYNCER); |
b411b363 | 2193 | |
b30ab791 | 2194 | if (get_ldev(device)) { |
b411b363 PR |
2195 | /* data is submitted to disk within recv_resync_read. |
2196 | * corresponding put_ldev done below on error, | |
fcefa62e | 2197 | * or in drbd_peer_request_endio. */ |
a0fb3c47 | 2198 | err = recv_resync_read(peer_device, sector, pi); |
b411b363 PR |
2199 | } else { |
2200 | if (__ratelimit(&drbd_ratelimit_state)) | |
d0180171 | 2201 | drbd_err(device, "Can not write resync data to local disk.\n"); |
b411b363 | 2202 | |
69a22773 | 2203 | err = drbd_drain_block(peer_device, pi->size); |
b411b363 | 2204 | |
69a22773 | 2205 | drbd_send_ack_dp(peer_device, P_NEG_ACK, p, pi->size); |
b411b363 PR |
2206 | } |
2207 | ||
b30ab791 | 2208 | atomic_add(pi->size >> 9, &device->rs_sect_in); |
778f271d | 2209 | |
82bc0194 | 2210 | return err; |
b411b363 PR |
2211 | } |
2212 | ||
b30ab791 | 2213 | static void restart_conflicting_writes(struct drbd_device *device, |
7be8da07 | 2214 | sector_t sector, int size) |
b411b363 | 2215 | { |
7be8da07 AG |
2216 | struct drbd_interval *i; |
2217 | struct drbd_request *req; | |
2218 | ||
b30ab791 | 2219 | drbd_for_each_overlap(i, &device->write_requests, sector, size) { |
7be8da07 AG |
2220 | if (!i->local) |
2221 | continue; | |
2222 | req = container_of(i, struct drbd_request, i); | |
2223 | if (req->rq_state & RQ_LOCAL_PENDING || | |
2224 | !(req->rq_state & RQ_POSTPONED)) | |
2225 | continue; | |
2312f0b3 LE |
2226 | /* as it is RQ_POSTPONED, this will cause it to |
2227 | * be queued on the retry workqueue. */ | |
d4dabbe2 | 2228 | __req_mod(req, CONFLICT_RESOLVED, NULL); |
7be8da07 AG |
2229 | } |
2230 | } | |
b411b363 | 2231 | |
a990be46 | 2232 | /* |
668700b4 | 2233 | * e_end_block() is called in ack_sender context via drbd_finish_peer_reqs(). |
b411b363 | 2234 | */ |
99920dc5 | 2235 | static int e_end_block(struct drbd_work *w, int cancel) |
b411b363 | 2236 | { |
8050e6d0 | 2237 | struct drbd_peer_request *peer_req = |
a8cd15ba AG |
2238 | container_of(w, struct drbd_peer_request, w); |
2239 | struct drbd_peer_device *peer_device = peer_req->peer_device; | |
2240 | struct drbd_device *device = peer_device->device; | |
db830c46 | 2241 | sector_t sector = peer_req->i.sector; |
99920dc5 | 2242 | int err = 0, pcmd; |
b411b363 | 2243 | |
303d1448 | 2244 | if (peer_req->flags & EE_SEND_WRITE_ACK) { |
db830c46 | 2245 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
b30ab791 AG |
2246 | pcmd = (device->state.conn >= C_SYNC_SOURCE && |
2247 | device->state.conn <= C_PAUSED_SYNC_T && | |
db830c46 | 2248 | peer_req->flags & EE_MAY_SET_IN_SYNC) ? |
b411b363 | 2249 | P_RS_WRITE_ACK : P_WRITE_ACK; |
a8cd15ba | 2250 | err = drbd_send_ack(peer_device, pcmd, peer_req); |
b411b363 | 2251 | if (pcmd == P_RS_WRITE_ACK) |
b30ab791 | 2252 | drbd_set_in_sync(device, sector, peer_req->i.size); |
b411b363 | 2253 | } else { |
a8cd15ba | 2254 | err = drbd_send_ack(peer_device, P_NEG_ACK, peer_req); |
b411b363 PR |
2255 | /* we expect it to be marked out of sync anyways... |
2256 | * maybe assert this? */ | |
2257 | } | |
b30ab791 | 2258 | dec_unacked(device); |
b411b363 | 2259 | } |
08d0dabf | 2260 | |
b411b363 PR |
2261 | /* we delete from the conflict detection hash _after_ we sent out the |
2262 | * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ | |
302bdeae | 2263 | if (peer_req->flags & EE_IN_INTERVAL_TREE) { |
0500813f | 2264 | spin_lock_irq(&device->resource->req_lock); |
0b0ba1ef | 2265 | D_ASSERT(device, !drbd_interval_empty(&peer_req->i)); |
b30ab791 | 2266 | drbd_remove_epoch_entry_interval(device, peer_req); |
7be8da07 | 2267 | if (peer_req->flags & EE_RESTART_REQUESTS) |
b30ab791 | 2268 | restart_conflicting_writes(device, sector, peer_req->i.size); |
0500813f | 2269 | spin_unlock_irq(&device->resource->req_lock); |
bb3bfe96 | 2270 | } else |
0b0ba1ef | 2271 | D_ASSERT(device, drbd_interval_empty(&peer_req->i)); |
b411b363 | 2272 | |
5dd2ca19 | 2273 | drbd_may_finish_epoch(peer_device->connection, peer_req->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0)); |
b411b363 | 2274 | |
99920dc5 | 2275 | return err; |
b411b363 PR |
2276 | } |
2277 | ||
a8cd15ba | 2278 | static int e_send_ack(struct drbd_work *w, enum drbd_packet ack) |
b411b363 | 2279 | { |
8050e6d0 | 2280 | struct drbd_peer_request *peer_req = |
a8cd15ba AG |
2281 | container_of(w, struct drbd_peer_request, w); |
2282 | struct drbd_peer_device *peer_device = peer_req->peer_device; | |
99920dc5 | 2283 | int err; |
b411b363 | 2284 | |
a8cd15ba AG |
2285 | err = drbd_send_ack(peer_device, ack, peer_req); |
2286 | dec_unacked(peer_device->device); | |
b411b363 | 2287 | |
99920dc5 | 2288 | return err; |
b411b363 PR |
2289 | } |
2290 | ||
d4dabbe2 | 2291 | static int e_send_superseded(struct drbd_work *w, int unused) |
7be8da07 | 2292 | { |
a8cd15ba | 2293 | return e_send_ack(w, P_SUPERSEDED); |
7be8da07 AG |
2294 | } |
2295 | ||
99920dc5 | 2296 | static int e_send_retry_write(struct drbd_work *w, int unused) |
7be8da07 | 2297 | { |
a8cd15ba AG |
2298 | struct drbd_peer_request *peer_req = |
2299 | container_of(w, struct drbd_peer_request, w); | |
2300 | struct drbd_connection *connection = peer_req->peer_device->connection; | |
7be8da07 | 2301 | |
a8cd15ba | 2302 | return e_send_ack(w, connection->agreed_pro_version >= 100 ? |
d4dabbe2 | 2303 | P_RETRY_WRITE : P_SUPERSEDED); |
7be8da07 | 2304 | } |
b411b363 | 2305 | |
3e394da1 AG |
2306 | static bool seq_greater(u32 a, u32 b) |
2307 | { | |
2308 | /* | |
2309 | * We assume 32-bit wrap-around here. | |
2310 | * For 24-bit wrap-around, we would have to shift: | |
2311 | * a <<= 8; b <<= 8; | |
2312 | */ | |
2313 | return (s32)a - (s32)b > 0; | |
2314 | } | |
b411b363 | 2315 | |
3e394da1 AG |
2316 | static u32 seq_max(u32 a, u32 b) |
2317 | { | |
2318 | return seq_greater(a, b) ? a : b; | |
b411b363 PR |
2319 | } |
2320 | ||
69a22773 | 2321 | static void update_peer_seq(struct drbd_peer_device *peer_device, unsigned int peer_seq) |
3e394da1 | 2322 | { |
69a22773 | 2323 | struct drbd_device *device = peer_device->device; |
3c13b680 | 2324 | unsigned int newest_peer_seq; |
3e394da1 | 2325 | |
69a22773 | 2326 | if (test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags)) { |
b30ab791 AG |
2327 | spin_lock(&device->peer_seq_lock); |
2328 | newest_peer_seq = seq_max(device->peer_seq, peer_seq); | |
2329 | device->peer_seq = newest_peer_seq; | |
2330 | spin_unlock(&device->peer_seq_lock); | |
2331 | /* wake up only if we actually changed device->peer_seq */ | |
3c13b680 | 2332 | if (peer_seq == newest_peer_seq) |
b30ab791 | 2333 | wake_up(&device->seq_wait); |
7be8da07 | 2334 | } |
b411b363 PR |
2335 | } |
2336 | ||
d93f6302 | 2337 | static inline int overlaps(sector_t s1, int l1, sector_t s2, int l2) |
b6a370ba | 2338 | { |
d93f6302 LE |
2339 | return !((s1 + (l1>>9) <= s2) || (s1 >= s2 + (l2>>9))); |
2340 | } | |
b6a370ba | 2341 | |
d93f6302 | 2342 | /* maybe change sync_ee into interval trees as well? */ |
b30ab791 | 2343 | static bool overlapping_resync_write(struct drbd_device *device, struct drbd_peer_request *peer_req) |
d93f6302 LE |
2344 | { |
2345 | struct drbd_peer_request *rs_req; | |
7e5fec31 | 2346 | bool rv = false; |
b6a370ba | 2347 | |
0500813f | 2348 | spin_lock_irq(&device->resource->req_lock); |
a8cd15ba | 2349 | list_for_each_entry(rs_req, &device->sync_ee, w.list) { |
d93f6302 LE |
2350 | if (overlaps(peer_req->i.sector, peer_req->i.size, |
2351 | rs_req->i.sector, rs_req->i.size)) { | |
7e5fec31 | 2352 | rv = true; |
b6a370ba PR |
2353 | break; |
2354 | } | |
2355 | } | |
0500813f | 2356 | spin_unlock_irq(&device->resource->req_lock); |
b6a370ba PR |
2357 | |
2358 | return rv; | |
2359 | } | |
2360 | ||
b411b363 PR |
2361 | /* Called from receive_Data. |
2362 | * Synchronize packets on sock with packets on msock. | |
2363 | * | |
2364 | * This is here so even when a P_DATA packet traveling via sock overtook an Ack | |
2365 | * packet traveling on msock, they are still processed in the order they have | |
2366 | * been sent. | |
2367 | * | |
2368 | * Note: we don't care for Ack packets overtaking P_DATA packets. | |
2369 | * | |
b30ab791 | 2370 | * In case packet_seq is larger than device->peer_seq number, there are |
b411b363 | 2371 | * outstanding packets on the msock. We wait for them to arrive. |
b30ab791 | 2372 | * In case we are the logically next packet, we update device->peer_seq |
b411b363 PR |
2373 | * ourselves. Correctly handles 32bit wrap around. |
2374 | * | |
2375 | * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, | |
2376 | * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds | |
2377 | * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have | |
2378 | * 1<<9 == 512 seconds aka ages for the 32bit wrap around... | |
2379 | * | |
2380 | * returns 0 if we may process the packet, | |
2381 | * -ERESTARTSYS if we were interrupted (by disconnect signal). */ | |
69a22773 | 2382 | static int wait_for_and_update_peer_seq(struct drbd_peer_device *peer_device, const u32 peer_seq) |
b411b363 | 2383 | { |
69a22773 | 2384 | struct drbd_device *device = peer_device->device; |
b411b363 | 2385 | DEFINE_WAIT(wait); |
b411b363 | 2386 | long timeout; |
b874d231 | 2387 | int ret = 0, tp; |
7be8da07 | 2388 | |
69a22773 | 2389 | if (!test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags)) |
7be8da07 AG |
2390 | return 0; |
2391 | ||
b30ab791 | 2392 | spin_lock(&device->peer_seq_lock); |
b411b363 | 2393 | for (;;) { |
b30ab791 AG |
2394 | if (!seq_greater(peer_seq - 1, device->peer_seq)) { |
2395 | device->peer_seq = seq_max(device->peer_seq, peer_seq); | |
b411b363 | 2396 | break; |
7be8da07 | 2397 | } |
b874d231 | 2398 | |
b411b363 PR |
2399 | if (signal_pending(current)) { |
2400 | ret = -ERESTARTSYS; | |
2401 | break; | |
2402 | } | |
b874d231 PR |
2403 | |
2404 | rcu_read_lock(); | |
5dd2ca19 | 2405 | tp = rcu_dereference(peer_device->connection->net_conf)->two_primaries; |
b874d231 PR |
2406 | rcu_read_unlock(); |
2407 | ||
2408 | if (!tp) | |
2409 | break; | |
2410 | ||
2411 | /* Only need to wait if two_primaries is enabled */ | |
b30ab791 AG |
2412 | prepare_to_wait(&device->seq_wait, &wait, TASK_INTERRUPTIBLE); |
2413 | spin_unlock(&device->peer_seq_lock); | |
44ed167d | 2414 | rcu_read_lock(); |
69a22773 | 2415 | timeout = rcu_dereference(peer_device->connection->net_conf)->ping_timeo*HZ/10; |
44ed167d | 2416 | rcu_read_unlock(); |
71b1c1eb | 2417 | timeout = schedule_timeout(timeout); |
b30ab791 | 2418 | spin_lock(&device->peer_seq_lock); |
7be8da07 | 2419 | if (!timeout) { |
b411b363 | 2420 | ret = -ETIMEDOUT; |
d0180171 | 2421 | drbd_err(device, "Timed out waiting for missing ack packets; disconnecting\n"); |
b411b363 PR |
2422 | break; |
2423 | } | |
2424 | } | |
b30ab791 AG |
2425 | spin_unlock(&device->peer_seq_lock); |
2426 | finish_wait(&device->seq_wait, &wait); | |
b411b363 PR |
2427 | return ret; |
2428 | } | |
2429 | ||
688593c5 LE |
2430 | /* see also bio_flags_to_wire() |
2431 | * DRBD_REQ_*, because we need to semantically map the flags to data packet | |
2432 | * flags and back. We may replicate to other kernel versions. */ | |
bb3cc85e | 2433 | static unsigned long wire_flags_to_bio_flags(u32 dpf) |
76d2e7ec | 2434 | { |
688593c5 LE |
2435 | return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | |
2436 | (dpf & DP_FUA ? REQ_FUA : 0) | | |
28a8f0d3 | 2437 | (dpf & DP_FLUSH ? REQ_PREFLUSH : 0); |
bb3cc85e MC |
2438 | } |
2439 | ||
2440 | static unsigned long wire_flags_to_bio_op(u32 dpf) | |
2441 | { | |
f31e583a | 2442 | if (dpf & DP_ZEROES) |
45c21793 | 2443 | return REQ_OP_WRITE_ZEROES; |
f31e583a LE |
2444 | if (dpf & DP_DISCARD) |
2445 | return REQ_OP_DISCARD; | |
2446 | if (dpf & DP_WSAME) | |
2447 | return REQ_OP_WRITE_SAME; | |
bb3cc85e MC |
2448 | else |
2449 | return REQ_OP_WRITE; | |
76d2e7ec PR |
2450 | } |
2451 | ||
b30ab791 | 2452 | static void fail_postponed_requests(struct drbd_device *device, sector_t sector, |
7be8da07 AG |
2453 | unsigned int size) |
2454 | { | |
2455 | struct drbd_interval *i; | |
2456 | ||
2457 | repeat: | |
b30ab791 | 2458 | drbd_for_each_overlap(i, &device->write_requests, sector, size) { |
7be8da07 AG |
2459 | struct drbd_request *req; |
2460 | struct bio_and_error m; | |
2461 | ||
2462 | if (!i->local) | |
2463 | continue; | |
2464 | req = container_of(i, struct drbd_request, i); | |
2465 | if (!(req->rq_state & RQ_POSTPONED)) | |
2466 | continue; | |
2467 | req->rq_state &= ~RQ_POSTPONED; | |
2468 | __req_mod(req, NEG_ACKED, &m); | |
0500813f | 2469 | spin_unlock_irq(&device->resource->req_lock); |
7be8da07 | 2470 | if (m.bio) |
b30ab791 | 2471 | complete_master_bio(device, &m); |
0500813f | 2472 | spin_lock_irq(&device->resource->req_lock); |
7be8da07 AG |
2473 | goto repeat; |
2474 | } | |
2475 | } | |
2476 | ||
b30ab791 | 2477 | static int handle_write_conflicts(struct drbd_device *device, |
7be8da07 AG |
2478 | struct drbd_peer_request *peer_req) |
2479 | { | |
e33b32de | 2480 | struct drbd_connection *connection = peer_req->peer_device->connection; |
bde89a9e | 2481 | bool resolve_conflicts = test_bit(RESOLVE_CONFLICTS, &connection->flags); |
7be8da07 AG |
2482 | sector_t sector = peer_req->i.sector; |
2483 | const unsigned int size = peer_req->i.size; | |
2484 | struct drbd_interval *i; | |
2485 | bool equal; | |
2486 | int err; | |
2487 | ||
2488 | /* | |
2489 | * Inserting the peer request into the write_requests tree will prevent | |
2490 | * new conflicting local requests from being added. | |
2491 | */ | |
b30ab791 | 2492 | drbd_insert_interval(&device->write_requests, &peer_req->i); |
7be8da07 AG |
2493 | |
2494 | repeat: | |
b30ab791 | 2495 | drbd_for_each_overlap(i, &device->write_requests, sector, size) { |
7be8da07 AG |
2496 | if (i == &peer_req->i) |
2497 | continue; | |
08d0dabf LE |
2498 | if (i->completed) |
2499 | continue; | |
7be8da07 AG |
2500 | |
2501 | if (!i->local) { | |
2502 | /* | |
2503 | * Our peer has sent a conflicting remote request; this | |
2504 | * should not happen in a two-node setup. Wait for the | |
2505 | * earlier peer request to complete. | |
2506 | */ | |
b30ab791 | 2507 | err = drbd_wait_misc(device, i); |
7be8da07 AG |
2508 | if (err) |
2509 | goto out; | |
2510 | goto repeat; | |
2511 | } | |
2512 | ||
2513 | equal = i->sector == sector && i->size == size; | |
2514 | if (resolve_conflicts) { | |
2515 | /* | |
2516 | * If the peer request is fully contained within the | |
d4dabbe2 LE |
2517 | * overlapping request, it can be considered overwritten |
2518 | * and thus superseded; otherwise, it will be retried | |
2519 | * once all overlapping requests have completed. | |
7be8da07 | 2520 | */ |
d4dabbe2 | 2521 | bool superseded = i->sector <= sector && i->sector + |
7be8da07 AG |
2522 | (i->size >> 9) >= sector + (size >> 9); |
2523 | ||
2524 | if (!equal) | |
d0180171 | 2525 | drbd_alert(device, "Concurrent writes detected: " |
7be8da07 AG |
2526 | "local=%llus +%u, remote=%llus +%u, " |
2527 | "assuming %s came first\n", | |
2528 | (unsigned long long)i->sector, i->size, | |
2529 | (unsigned long long)sector, size, | |
d4dabbe2 | 2530 | superseded ? "local" : "remote"); |
7be8da07 | 2531 | |
a8cd15ba | 2532 | peer_req->w.cb = superseded ? e_send_superseded : |
7be8da07 | 2533 | e_send_retry_write; |
a8cd15ba | 2534 | list_add_tail(&peer_req->w.list, &device->done_ee); |
668700b4 | 2535 | queue_work(connection->ack_sender, &peer_req->peer_device->send_acks_work); |
7be8da07 AG |
2536 | |
2537 | err = -ENOENT; | |
2538 | goto out; | |
2539 | } else { | |
2540 | struct drbd_request *req = | |
2541 | container_of(i, struct drbd_request, i); | |
2542 | ||
2543 | if (!equal) | |
d0180171 | 2544 | drbd_alert(device, "Concurrent writes detected: " |
7be8da07 AG |
2545 | "local=%llus +%u, remote=%llus +%u\n", |
2546 | (unsigned long long)i->sector, i->size, | |
2547 | (unsigned long long)sector, size); | |
2548 | ||
2549 | if (req->rq_state & RQ_LOCAL_PENDING || | |
2550 | !(req->rq_state & RQ_POSTPONED)) { | |
2551 | /* | |
2552 | * Wait for the node with the discard flag to | |
d4dabbe2 LE |
2553 | * decide if this request has been superseded |
2554 | * or needs to be retried. | |
2555 | * Requests that have been superseded will | |
7be8da07 AG |
2556 | * disappear from the write_requests tree. |
2557 | * | |
2558 | * In addition, wait for the conflicting | |
2559 | * request to finish locally before submitting | |
2560 | * the conflicting peer request. | |
2561 | */ | |
b30ab791 | 2562 | err = drbd_wait_misc(device, &req->i); |
7be8da07 | 2563 | if (err) { |
e33b32de | 2564 | _conn_request_state(connection, NS(conn, C_TIMEOUT), CS_HARD); |
b30ab791 | 2565 | fail_postponed_requests(device, sector, size); |
7be8da07 AG |
2566 | goto out; |
2567 | } | |
2568 | goto repeat; | |
2569 | } | |
2570 | /* | |
2571 | * Remember to restart the conflicting requests after | |
2572 | * the new peer request has completed. | |
2573 | */ | |
2574 | peer_req->flags |= EE_RESTART_REQUESTS; | |
2575 | } | |
2576 | } | |
2577 | err = 0; | |
2578 | ||
2579 | out: | |
2580 | if (err) | |
b30ab791 | 2581 | drbd_remove_epoch_entry_interval(device, peer_req); |
7be8da07 AG |
2582 | return err; |
2583 | } | |
2584 | ||
b411b363 | 2585 | /* mirrored write */ |
bde89a9e | 2586 | static int receive_Data(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 2587 | { |
9f4fe9ad | 2588 | struct drbd_peer_device *peer_device; |
b30ab791 | 2589 | struct drbd_device *device; |
21ae5d7f | 2590 | struct net_conf *nc; |
b411b363 | 2591 | sector_t sector; |
db830c46 | 2592 | struct drbd_peer_request *peer_req; |
e658983a | 2593 | struct p_data *p = pi->data; |
7be8da07 | 2594 | u32 peer_seq = be32_to_cpu(p->seq_num); |
bb3cc85e | 2595 | int op, op_flags; |
b411b363 | 2596 | u32 dp_flags; |
302bdeae | 2597 | int err, tp; |
b411b363 | 2598 | |
9f4fe9ad AG |
2599 | peer_device = conn_peer_device(connection, pi->vnr); |
2600 | if (!peer_device) | |
4a76b161 | 2601 | return -EIO; |
9f4fe9ad | 2602 | device = peer_device->device; |
b411b363 | 2603 | |
b30ab791 | 2604 | if (!get_ldev(device)) { |
82bc0194 AG |
2605 | int err2; |
2606 | ||
69a22773 AG |
2607 | err = wait_for_and_update_peer_seq(peer_device, peer_seq); |
2608 | drbd_send_ack_dp(peer_device, P_NEG_ACK, p, pi->size); | |
bde89a9e | 2609 | atomic_inc(&connection->current_epoch->epoch_size); |
69a22773 | 2610 | err2 = drbd_drain_block(peer_device, pi->size); |
82bc0194 AG |
2611 | if (!err) |
2612 | err = err2; | |
2613 | return err; | |
b411b363 PR |
2614 | } |
2615 | ||
fcefa62e AG |
2616 | /* |
2617 | * Corresponding put_ldev done either below (on various errors), or in | |
2618 | * drbd_peer_request_endio, if we successfully submit the data at the | |
2619 | * end of this function. | |
2620 | */ | |
b411b363 PR |
2621 | |
2622 | sector = be64_to_cpu(p->sector); | |
a0fb3c47 | 2623 | peer_req = read_in_block(peer_device, p->block_id, sector, pi); |
db830c46 | 2624 | if (!peer_req) { |
b30ab791 | 2625 | put_ldev(device); |
82bc0194 | 2626 | return -EIO; |
b411b363 PR |
2627 | } |
2628 | ||
a8cd15ba | 2629 | peer_req->w.cb = e_end_block; |
21ae5d7f LE |
2630 | peer_req->submit_jif = jiffies; |
2631 | peer_req->flags |= EE_APPLICATION; | |
b411b363 | 2632 | |
688593c5 | 2633 | dp_flags = be32_to_cpu(p->dp_flags); |
bb3cc85e MC |
2634 | op = wire_flags_to_bio_op(dp_flags); |
2635 | op_flags = wire_flags_to_bio_flags(dp_flags); | |
a0fb3c47 | 2636 | if (pi->cmd == P_TRIM) { |
f31e583a LE |
2637 | D_ASSERT(peer_device, peer_req->i.size > 0); |
2638 | D_ASSERT(peer_device, op == REQ_OP_DISCARD); | |
2639 | D_ASSERT(peer_device, peer_req->pages == NULL); | |
2640 | /* need to play safe: an older DRBD sender | |
2641 | * may mean zero-out while sending P_TRIM. */ | |
2642 | if (0 == (connection->agreed_features & DRBD_FF_WZEROES)) | |
2643 | peer_req->flags |= EE_ZEROOUT; | |
2644 | } else if (pi->cmd == P_ZEROES) { | |
a0fb3c47 | 2645 | D_ASSERT(peer_device, peer_req->i.size > 0); |
45c21793 | 2646 | D_ASSERT(peer_device, op == REQ_OP_WRITE_ZEROES); |
a0fb3c47 | 2647 | D_ASSERT(peer_device, peer_req->pages == NULL); |
f31e583a LE |
2648 | /* Do (not) pass down BLKDEV_ZERO_NOUNMAP? */ |
2649 | if (dp_flags & DP_DISCARD) | |
2650 | peer_req->flags |= EE_TRIM; | |
a0fb3c47 | 2651 | } else if (peer_req->pages == NULL) { |
0b0ba1ef AG |
2652 | D_ASSERT(device, peer_req->i.size == 0); |
2653 | D_ASSERT(device, dp_flags & DP_FLUSH); | |
a73ff323 | 2654 | } |
688593c5 LE |
2655 | |
2656 | if (dp_flags & DP_MAY_SET_IN_SYNC) | |
db830c46 | 2657 | peer_req->flags |= EE_MAY_SET_IN_SYNC; |
688593c5 | 2658 | |
bde89a9e AG |
2659 | spin_lock(&connection->epoch_lock); |
2660 | peer_req->epoch = connection->current_epoch; | |
db830c46 AG |
2661 | atomic_inc(&peer_req->epoch->epoch_size); |
2662 | atomic_inc(&peer_req->epoch->active); | |
bde89a9e | 2663 | spin_unlock(&connection->epoch_lock); |
b411b363 | 2664 | |
302bdeae | 2665 | rcu_read_lock(); |
21ae5d7f LE |
2666 | nc = rcu_dereference(peer_device->connection->net_conf); |
2667 | tp = nc->two_primaries; | |
2668 | if (peer_device->connection->agreed_pro_version < 100) { | |
2669 | switch (nc->wire_protocol) { | |
2670 | case DRBD_PROT_C: | |
2671 | dp_flags |= DP_SEND_WRITE_ACK; | |
2672 | break; | |
2673 | case DRBD_PROT_B: | |
2674 | dp_flags |= DP_SEND_RECEIVE_ACK; | |
2675 | break; | |
2676 | } | |
2677 | } | |
302bdeae | 2678 | rcu_read_unlock(); |
21ae5d7f LE |
2679 | |
2680 | if (dp_flags & DP_SEND_WRITE_ACK) { | |
2681 | peer_req->flags |= EE_SEND_WRITE_ACK; | |
2682 | inc_unacked(device); | |
2683 | /* corresponding dec_unacked() in e_end_block() | |
2684 | * respective _drbd_clear_done_ee */ | |
2685 | } | |
2686 | ||
2687 | if (dp_flags & DP_SEND_RECEIVE_ACK) { | |
2688 | /* I really don't like it that the receiver thread | |
2689 | * sends on the msock, but anyways */ | |
5dd2ca19 | 2690 | drbd_send_ack(peer_device, P_RECV_ACK, peer_req); |
21ae5d7f LE |
2691 | } |
2692 | ||
302bdeae | 2693 | if (tp) { |
21ae5d7f LE |
2694 | /* two primaries implies protocol C */ |
2695 | D_ASSERT(device, dp_flags & DP_SEND_WRITE_ACK); | |
302bdeae | 2696 | peer_req->flags |= EE_IN_INTERVAL_TREE; |
69a22773 | 2697 | err = wait_for_and_update_peer_seq(peer_device, peer_seq); |
7be8da07 | 2698 | if (err) |
b411b363 | 2699 | goto out_interrupted; |
0500813f | 2700 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 | 2701 | err = handle_write_conflicts(device, peer_req); |
7be8da07 | 2702 | if (err) { |
0500813f | 2703 | spin_unlock_irq(&device->resource->req_lock); |
7be8da07 | 2704 | if (err == -ENOENT) { |
b30ab791 | 2705 | put_ldev(device); |
82bc0194 | 2706 | return 0; |
b411b363 | 2707 | } |
7be8da07 | 2708 | goto out_interrupted; |
b411b363 | 2709 | } |
b874d231 | 2710 | } else { |
69a22773 | 2711 | update_peer_seq(peer_device, peer_seq); |
0500813f | 2712 | spin_lock_irq(&device->resource->req_lock); |
b874d231 | 2713 | } |
9104d31a LE |
2714 | /* TRIM and WRITE_SAME are processed synchronously, |
2715 | * we wait for all pending requests, respectively wait for | |
a0fb3c47 LE |
2716 | * active_ee to become empty in drbd_submit_peer_request(); |
2717 | * better not add ourselves here. */ | |
f31e583a | 2718 | if ((peer_req->flags & (EE_TRIM|EE_WRITE_SAME|EE_ZEROOUT)) == 0) |
b9ed7080 | 2719 | list_add_tail(&peer_req->w.list, &device->active_ee); |
0500813f | 2720 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 | 2721 | |
b30ab791 AG |
2722 | if (device->state.conn == C_SYNC_TARGET) |
2723 | wait_event(device->ee_wait, !overlapping_resync_write(device, peer_req)); | |
b411b363 | 2724 | |
b30ab791 | 2725 | if (device->state.pdsk < D_INCONSISTENT) { |
b411b363 | 2726 | /* In case we have the only disk of the cluster, */ |
b30ab791 | 2727 | drbd_set_out_of_sync(device, peer_req->i.sector, peer_req->i.size); |
db830c46 | 2728 | peer_req->flags &= ~EE_MAY_SET_IN_SYNC; |
4dd726f0 | 2729 | drbd_al_begin_io(device, &peer_req->i); |
21ae5d7f | 2730 | peer_req->flags |= EE_CALL_AL_COMPLETE_IO; |
b411b363 PR |
2731 | } |
2732 | ||
bb3cc85e MC |
2733 | err = drbd_submit_peer_request(device, peer_req, op, op_flags, |
2734 | DRBD_FAULT_DT_WR); | |
82bc0194 AG |
2735 | if (!err) |
2736 | return 0; | |
b411b363 | 2737 | |
10f6d992 | 2738 | /* don't care for the reason here */ |
d0180171 | 2739 | drbd_err(device, "submit failed, triggering re-connect\n"); |
0500813f | 2740 | spin_lock_irq(&device->resource->req_lock); |
a8cd15ba | 2741 | list_del(&peer_req->w.list); |
b30ab791 | 2742 | drbd_remove_epoch_entry_interval(device, peer_req); |
0500813f | 2743 | spin_unlock_irq(&device->resource->req_lock); |
21ae5d7f LE |
2744 | if (peer_req->flags & EE_CALL_AL_COMPLETE_IO) { |
2745 | peer_req->flags &= ~EE_CALL_AL_COMPLETE_IO; | |
b30ab791 | 2746 | drbd_al_complete_io(device, &peer_req->i); |
21ae5d7f | 2747 | } |
22cc37a9 | 2748 | |
b411b363 | 2749 | out_interrupted: |
7e5fec31 | 2750 | drbd_may_finish_epoch(connection, peer_req->epoch, EV_PUT | EV_CLEANUP); |
b30ab791 AG |
2751 | put_ldev(device); |
2752 | drbd_free_peer_req(device, peer_req); | |
82bc0194 | 2753 | return err; |
b411b363 PR |
2754 | } |
2755 | ||
0f0601f4 LE |
2756 | /* We may throttle resync, if the lower device seems to be busy, |
2757 | * and current sync rate is above c_min_rate. | |
2758 | * | |
2759 | * To decide whether or not the lower device is busy, we use a scheme similar | |
2760 | * to MD RAID is_mddev_idle(): if the partition stats reveal "significant" | |
2761 | * (more than 64 sectors) of activity we cannot account for with our own resync | |
2762 | * activity, it obviously is "busy". | |
2763 | * | |
2764 | * The current sync rate used here uses only the most recent two step marks, | |
2765 | * to have a short time average so we can react faster. | |
2766 | */ | |
ad3fee79 LE |
2767 | bool drbd_rs_should_slow_down(struct drbd_device *device, sector_t sector, |
2768 | bool throttle_if_app_is_waiting) | |
0f0601f4 | 2769 | { |
e3555d85 | 2770 | struct lc_element *tmp; |
ad3fee79 | 2771 | bool throttle = drbd_rs_c_min_rate_throttle(device); |
daeda1cc | 2772 | |
ad3fee79 LE |
2773 | if (!throttle || throttle_if_app_is_waiting) |
2774 | return throttle; | |
0f0601f4 | 2775 | |
b30ab791 AG |
2776 | spin_lock_irq(&device->al_lock); |
2777 | tmp = lc_find(device->resync, BM_SECT_TO_EXT(sector)); | |
e3555d85 PR |
2778 | if (tmp) { |
2779 | struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); | |
e8299874 LE |
2780 | if (test_bit(BME_PRIORITY, &bm_ext->flags)) |
2781 | throttle = false; | |
ad3fee79 LE |
2782 | /* Do not slow down if app IO is already waiting for this extent, |
2783 | * and our progress is necessary for application IO to complete. */ | |
e3555d85 | 2784 | } |
b30ab791 | 2785 | spin_unlock_irq(&device->al_lock); |
e3555d85 | 2786 | |
e8299874 LE |
2787 | return throttle; |
2788 | } | |
2789 | ||
2790 | bool drbd_rs_c_min_rate_throttle(struct drbd_device *device) | |
2791 | { | |
2792 | struct gendisk *disk = device->ldev->backing_bdev->bd_contains->bd_disk; | |
2793 | unsigned long db, dt, dbdt; | |
2794 | unsigned int c_min_rate; | |
2795 | int curr_events; | |
2796 | ||
2797 | rcu_read_lock(); | |
2798 | c_min_rate = rcu_dereference(device->ldev->disk_conf)->c_min_rate; | |
2799 | rcu_read_unlock(); | |
2800 | ||
2801 | /* feature disabled? */ | |
2802 | if (c_min_rate == 0) | |
2803 | return false; | |
2804 | ||
59767fbd | 2805 | curr_events = (int)part_stat_read_accum(&disk->part0, sectors) - |
b30ab791 | 2806 | atomic_read(&device->rs_sect_ev); |
ad3fee79 LE |
2807 | |
2808 | if (atomic_read(&device->ap_actlog_cnt) | |
ff8bd88b | 2809 | || curr_events - device->rs_last_events > 64) { |
0f0601f4 LE |
2810 | unsigned long rs_left; |
2811 | int i; | |
2812 | ||
b30ab791 | 2813 | device->rs_last_events = curr_events; |
0f0601f4 LE |
2814 | |
2815 | /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, | |
2816 | * approx. */ | |
b30ab791 | 2817 | i = (device->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; |
2649f080 | 2818 | |
b30ab791 AG |
2819 | if (device->state.conn == C_VERIFY_S || device->state.conn == C_VERIFY_T) |
2820 | rs_left = device->ov_left; | |
2649f080 | 2821 | else |
b30ab791 | 2822 | rs_left = drbd_bm_total_weight(device) - device->rs_failed; |
0f0601f4 | 2823 | |
b30ab791 | 2824 | dt = ((long)jiffies - (long)device->rs_mark_time[i]) / HZ; |
0f0601f4 LE |
2825 | if (!dt) |
2826 | dt++; | |
b30ab791 | 2827 | db = device->rs_mark_left[i] - rs_left; |
0f0601f4 LE |
2828 | dbdt = Bit2KB(db/dt); |
2829 | ||
daeda1cc | 2830 | if (dbdt > c_min_rate) |
e8299874 | 2831 | return true; |
0f0601f4 | 2832 | } |
e8299874 | 2833 | return false; |
0f0601f4 LE |
2834 | } |
2835 | ||
bde89a9e | 2836 | static int receive_DataRequest(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 2837 | { |
9f4fe9ad | 2838 | struct drbd_peer_device *peer_device; |
b30ab791 | 2839 | struct drbd_device *device; |
b411b363 | 2840 | sector_t sector; |
4a76b161 | 2841 | sector_t capacity; |
db830c46 | 2842 | struct drbd_peer_request *peer_req; |
b411b363 | 2843 | struct digest_info *di = NULL; |
b18b37be | 2844 | int size, verb; |
b411b363 | 2845 | unsigned int fault_type; |
e658983a | 2846 | struct p_block_req *p = pi->data; |
4a76b161 | 2847 | |
9f4fe9ad AG |
2848 | peer_device = conn_peer_device(connection, pi->vnr); |
2849 | if (!peer_device) | |
4a76b161 | 2850 | return -EIO; |
9f4fe9ad | 2851 | device = peer_device->device; |
b30ab791 | 2852 | capacity = drbd_get_capacity(device->this_bdev); |
b411b363 PR |
2853 | |
2854 | sector = be64_to_cpu(p->sector); | |
2855 | size = be32_to_cpu(p->blksize); | |
2856 | ||
c670a398 | 2857 | if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) { |
d0180171 | 2858 | drbd_err(device, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, |
b411b363 | 2859 | (unsigned long long)sector, size); |
82bc0194 | 2860 | return -EINVAL; |
b411b363 PR |
2861 | } |
2862 | if (sector + (size>>9) > capacity) { | |
d0180171 | 2863 | drbd_err(device, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__, |
b411b363 | 2864 | (unsigned long long)sector, size); |
82bc0194 | 2865 | return -EINVAL; |
b411b363 PR |
2866 | } |
2867 | ||
b30ab791 | 2868 | if (!get_ldev_if_state(device, D_UP_TO_DATE)) { |
b18b37be | 2869 | verb = 1; |
e2857216 | 2870 | switch (pi->cmd) { |
b18b37be | 2871 | case P_DATA_REQUEST: |
69a22773 | 2872 | drbd_send_ack_rp(peer_device, P_NEG_DREPLY, p); |
b18b37be | 2873 | break; |
700ca8c0 | 2874 | case P_RS_THIN_REQ: |
b18b37be PR |
2875 | case P_RS_DATA_REQUEST: |
2876 | case P_CSUM_RS_REQUEST: | |
2877 | case P_OV_REQUEST: | |
69a22773 | 2878 | drbd_send_ack_rp(peer_device, P_NEG_RS_DREPLY , p); |
b18b37be PR |
2879 | break; |
2880 | case P_OV_REPLY: | |
2881 | verb = 0; | |
b30ab791 | 2882 | dec_rs_pending(device); |
69a22773 | 2883 | drbd_send_ack_ex(peer_device, P_OV_RESULT, sector, size, ID_IN_SYNC); |
b18b37be PR |
2884 | break; |
2885 | default: | |
49ba9b1b | 2886 | BUG(); |
b18b37be PR |
2887 | } |
2888 | if (verb && __ratelimit(&drbd_ratelimit_state)) | |
d0180171 | 2889 | drbd_err(device, "Can not satisfy peer's read request, " |
b411b363 | 2890 | "no local data.\n"); |
b18b37be | 2891 | |
a821cc4a | 2892 | /* drain possibly payload */ |
69a22773 | 2893 | return drbd_drain_block(peer_device, pi->size); |
b411b363 PR |
2894 | } |
2895 | ||
2896 | /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD | |
2897 | * "criss-cross" setup, that might cause write-out on some other DRBD, | |
2898 | * which in turn might block on the other node at this very place. */ | |
a0fb3c47 | 2899 | peer_req = drbd_alloc_peer_req(peer_device, p->block_id, sector, size, |
9104d31a | 2900 | size, GFP_NOIO); |
db830c46 | 2901 | if (!peer_req) { |
b30ab791 | 2902 | put_ldev(device); |
82bc0194 | 2903 | return -ENOMEM; |
b411b363 PR |
2904 | } |
2905 | ||
e2857216 | 2906 | switch (pi->cmd) { |
b411b363 | 2907 | case P_DATA_REQUEST: |
a8cd15ba | 2908 | peer_req->w.cb = w_e_end_data_req; |
b411b363 | 2909 | fault_type = DRBD_FAULT_DT_RD; |
80a40e43 | 2910 | /* application IO, don't drbd_rs_begin_io */ |
21ae5d7f | 2911 | peer_req->flags |= EE_APPLICATION; |
80a40e43 LE |
2912 | goto submit; |
2913 | ||
700ca8c0 PR |
2914 | case P_RS_THIN_REQ: |
2915 | /* If at some point in the future we have a smart way to | |
2916 | find out if this data block is completely deallocated, | |
2917 | then we would do something smarter here than reading | |
2918 | the block... */ | |
2919 | peer_req->flags |= EE_RS_THIN_REQ; | |
df561f66 | 2920 | fallthrough; |
b411b363 | 2921 | case P_RS_DATA_REQUEST: |
a8cd15ba | 2922 | peer_req->w.cb = w_e_end_rsdata_req; |
b411b363 | 2923 | fault_type = DRBD_FAULT_RS_RD; |
5f9915bb | 2924 | /* used in the sector offset progress display */ |
b30ab791 | 2925 | device->bm_resync_fo = BM_SECT_TO_BIT(sector); |
b411b363 PR |
2926 | break; |
2927 | ||
2928 | case P_OV_REPLY: | |
2929 | case P_CSUM_RS_REQUEST: | |
2930 | fault_type = DRBD_FAULT_RS_RD; | |
e2857216 | 2931 | di = kmalloc(sizeof(*di) + pi->size, GFP_NOIO); |
b411b363 PR |
2932 | if (!di) |
2933 | goto out_free_e; | |
2934 | ||
e2857216 | 2935 | di->digest_size = pi->size; |
b411b363 PR |
2936 | di->digest = (((char *)di)+sizeof(struct digest_info)); |
2937 | ||
db830c46 AG |
2938 | peer_req->digest = di; |
2939 | peer_req->flags |= EE_HAS_DIGEST; | |
c36c3ced | 2940 | |
9f4fe9ad | 2941 | if (drbd_recv_all(peer_device->connection, di->digest, pi->size)) |
b411b363 PR |
2942 | goto out_free_e; |
2943 | ||
e2857216 | 2944 | if (pi->cmd == P_CSUM_RS_REQUEST) { |
9f4fe9ad | 2945 | D_ASSERT(device, peer_device->connection->agreed_pro_version >= 89); |
a8cd15ba | 2946 | peer_req->w.cb = w_e_end_csum_rs_req; |
5f9915bb | 2947 | /* used in the sector offset progress display */ |
b30ab791 | 2948 | device->bm_resync_fo = BM_SECT_TO_BIT(sector); |
aaaba345 LE |
2949 | /* remember to report stats in drbd_resync_finished */ |
2950 | device->use_csums = true; | |
e2857216 | 2951 | } else if (pi->cmd == P_OV_REPLY) { |
2649f080 | 2952 | /* track progress, we may need to throttle */ |
b30ab791 | 2953 | atomic_add(size >> 9, &device->rs_sect_in); |
a8cd15ba | 2954 | peer_req->w.cb = w_e_end_ov_reply; |
b30ab791 | 2955 | dec_rs_pending(device); |
0f0601f4 LE |
2956 | /* drbd_rs_begin_io done when we sent this request, |
2957 | * but accounting still needs to be done. */ | |
2958 | goto submit_for_resync; | |
b411b363 PR |
2959 | } |
2960 | break; | |
2961 | ||
2962 | case P_OV_REQUEST: | |
b30ab791 | 2963 | if (device->ov_start_sector == ~(sector_t)0 && |
9f4fe9ad | 2964 | peer_device->connection->agreed_pro_version >= 90) { |
de228bba LE |
2965 | unsigned long now = jiffies; |
2966 | int i; | |
b30ab791 AG |
2967 | device->ov_start_sector = sector; |
2968 | device->ov_position = sector; | |
2969 | device->ov_left = drbd_bm_bits(device) - BM_SECT_TO_BIT(sector); | |
2970 | device->rs_total = device->ov_left; | |
de228bba | 2971 | for (i = 0; i < DRBD_SYNC_MARKS; i++) { |
b30ab791 AG |
2972 | device->rs_mark_left[i] = device->ov_left; |
2973 | device->rs_mark_time[i] = now; | |
de228bba | 2974 | } |
d0180171 | 2975 | drbd_info(device, "Online Verify start sector: %llu\n", |
b411b363 PR |
2976 | (unsigned long long)sector); |
2977 | } | |
a8cd15ba | 2978 | peer_req->w.cb = w_e_end_ov_req; |
b411b363 | 2979 | fault_type = DRBD_FAULT_RS_RD; |
b411b363 PR |
2980 | break; |
2981 | ||
b411b363 | 2982 | default: |
49ba9b1b | 2983 | BUG(); |
b411b363 PR |
2984 | } |
2985 | ||
0f0601f4 LE |
2986 | /* Throttle, drbd_rs_begin_io and submit should become asynchronous |
2987 | * wrt the receiver, but it is not as straightforward as it may seem. | |
2988 | * Various places in the resync start and stop logic assume resync | |
2989 | * requests are processed in order, requeuing this on the worker thread | |
2990 | * introduces a bunch of new code for synchronization between threads. | |
2991 | * | |
2992 | * Unlimited throttling before drbd_rs_begin_io may stall the resync | |
2993 | * "forever", throttling after drbd_rs_begin_io will lock that extent | |
2994 | * for application writes for the same time. For now, just throttle | |
2995 | * here, where the rest of the code expects the receiver to sleep for | |
2996 | * a while, anyways. | |
2997 | */ | |
2998 | ||
2999 | /* Throttle before drbd_rs_begin_io, as that locks out application IO; | |
3000 | * this defers syncer requests for some time, before letting at least | |
3001 | * on request through. The resync controller on the receiving side | |
3002 | * will adapt to the incoming rate accordingly. | |
3003 | * | |
3004 | * We cannot throttle here if remote is Primary/SyncTarget: | |
3005 | * we would also throttle its application reads. | |
3006 | * In that case, throttling is done on the SyncTarget only. | |
3007 | */ | |
c5a2c150 LE |
3008 | |
3009 | /* Even though this may be a resync request, we do add to "read_ee"; | |
3010 | * "sync_ee" is only used for resync WRITEs. | |
3011 | * Add to list early, so debugfs can find this request | |
3012 | * even if we have to sleep below. */ | |
3013 | spin_lock_irq(&device->resource->req_lock); | |
3014 | list_add_tail(&peer_req->w.list, &device->read_ee); | |
3015 | spin_unlock_irq(&device->resource->req_lock); | |
3016 | ||
944410e9 | 3017 | update_receiver_timing_details(connection, drbd_rs_should_slow_down); |
ad3fee79 LE |
3018 | if (device->state.peer != R_PRIMARY |
3019 | && drbd_rs_should_slow_down(device, sector, false)) | |
e3555d85 | 3020 | schedule_timeout_uninterruptible(HZ/10); |
944410e9 | 3021 | update_receiver_timing_details(connection, drbd_rs_begin_io); |
b30ab791 | 3022 | if (drbd_rs_begin_io(device, sector)) |
80a40e43 | 3023 | goto out_free_e; |
b411b363 | 3024 | |
0f0601f4 | 3025 | submit_for_resync: |
b30ab791 | 3026 | atomic_add(size >> 9, &device->rs_sect_ev); |
0f0601f4 | 3027 | |
80a40e43 | 3028 | submit: |
944410e9 | 3029 | update_receiver_timing_details(connection, drbd_submit_peer_request); |
b30ab791 | 3030 | inc_unacked(device); |
bb3cc85e MC |
3031 | if (drbd_submit_peer_request(device, peer_req, REQ_OP_READ, 0, |
3032 | fault_type) == 0) | |
82bc0194 | 3033 | return 0; |
b411b363 | 3034 | |
10f6d992 | 3035 | /* don't care for the reason here */ |
d0180171 | 3036 | drbd_err(device, "submit failed, triggering re-connect\n"); |
c5a2c150 LE |
3037 | |
3038 | out_free_e: | |
0500813f | 3039 | spin_lock_irq(&device->resource->req_lock); |
a8cd15ba | 3040 | list_del(&peer_req->w.list); |
0500813f | 3041 | spin_unlock_irq(&device->resource->req_lock); |
22cc37a9 LE |
3042 | /* no drbd_rs_complete_io(), we are dropping the connection anyways */ |
3043 | ||
b30ab791 AG |
3044 | put_ldev(device); |
3045 | drbd_free_peer_req(device, peer_req); | |
82bc0194 | 3046 | return -EIO; |
b411b363 PR |
3047 | } |
3048 | ||
69a22773 AG |
3049 | /** |
3050 | * drbd_asb_recover_0p - Recover after split-brain with no remaining primaries | |
3051 | */ | |
3052 | static int drbd_asb_recover_0p(struct drbd_peer_device *peer_device) __must_hold(local) | |
b411b363 | 3053 | { |
69a22773 | 3054 | struct drbd_device *device = peer_device->device; |
b411b363 PR |
3055 | int self, peer, rv = -100; |
3056 | unsigned long ch_self, ch_peer; | |
44ed167d | 3057 | enum drbd_after_sb_p after_sb_0p; |
b411b363 | 3058 | |
b30ab791 AG |
3059 | self = device->ldev->md.uuid[UI_BITMAP] & 1; |
3060 | peer = device->p_uuid[UI_BITMAP] & 1; | |
b411b363 | 3061 | |
b30ab791 AG |
3062 | ch_peer = device->p_uuid[UI_SIZE]; |
3063 | ch_self = device->comm_bm_set; | |
b411b363 | 3064 | |
44ed167d | 3065 | rcu_read_lock(); |
69a22773 | 3066 | after_sb_0p = rcu_dereference(peer_device->connection->net_conf)->after_sb_0p; |
44ed167d PR |
3067 | rcu_read_unlock(); |
3068 | switch (after_sb_0p) { | |
b411b363 PR |
3069 | case ASB_CONSENSUS: |
3070 | case ASB_DISCARD_SECONDARY: | |
3071 | case ASB_CALL_HELPER: | |
44ed167d | 3072 | case ASB_VIOLENTLY: |
d0180171 | 3073 | drbd_err(device, "Configuration error.\n"); |
b411b363 PR |
3074 | break; |
3075 | case ASB_DISCONNECT: | |
3076 | break; | |
3077 | case ASB_DISCARD_YOUNGER_PRI: | |
3078 | if (self == 0 && peer == 1) { | |
3079 | rv = -1; | |
3080 | break; | |
3081 | } | |
3082 | if (self == 1 && peer == 0) { | |
3083 | rv = 1; | |
3084 | break; | |
3085 | } | |
df561f66 | 3086 | fallthrough; /* to one of the other strategies */ |
b411b363 PR |
3087 | case ASB_DISCARD_OLDER_PRI: |
3088 | if (self == 0 && peer == 1) { | |
3089 | rv = 1; | |
3090 | break; | |
3091 | } | |
3092 | if (self == 1 && peer == 0) { | |
3093 | rv = -1; | |
3094 | break; | |
3095 | } | |
3096 | /* Else fall through to one of the other strategies... */ | |
d0180171 | 3097 | drbd_warn(device, "Discard younger/older primary did not find a decision\n" |
b411b363 | 3098 | "Using discard-least-changes instead\n"); |
df561f66 | 3099 | fallthrough; |
b411b363 PR |
3100 | case ASB_DISCARD_ZERO_CHG: |
3101 | if (ch_peer == 0 && ch_self == 0) { | |
69a22773 | 3102 | rv = test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags) |
b411b363 PR |
3103 | ? -1 : 1; |
3104 | break; | |
3105 | } else { | |
3106 | if (ch_peer == 0) { rv = 1; break; } | |
3107 | if (ch_self == 0) { rv = -1; break; } | |
3108 | } | |
44ed167d | 3109 | if (after_sb_0p == ASB_DISCARD_ZERO_CHG) |
b411b363 | 3110 | break; |
df561f66 | 3111 | fallthrough; |
b411b363 PR |
3112 | case ASB_DISCARD_LEAST_CHG: |
3113 | if (ch_self < ch_peer) | |
3114 | rv = -1; | |
3115 | else if (ch_self > ch_peer) | |
3116 | rv = 1; | |
3117 | else /* ( ch_self == ch_peer ) */ | |
3118 | /* Well, then use something else. */ | |
69a22773 | 3119 | rv = test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags) |
b411b363 PR |
3120 | ? -1 : 1; |
3121 | break; | |
3122 | case ASB_DISCARD_LOCAL: | |
3123 | rv = -1; | |
3124 | break; | |
3125 | case ASB_DISCARD_REMOTE: | |
3126 | rv = 1; | |
3127 | } | |
3128 | ||
3129 | return rv; | |
3130 | } | |
3131 | ||
69a22773 AG |
3132 | /** |
3133 | * drbd_asb_recover_1p - Recover after split-brain with one remaining primary | |
3134 | */ | |
3135 | static int drbd_asb_recover_1p(struct drbd_peer_device *peer_device) __must_hold(local) | |
b411b363 | 3136 | { |
69a22773 | 3137 | struct drbd_device *device = peer_device->device; |
6184ea21 | 3138 | int hg, rv = -100; |
44ed167d | 3139 | enum drbd_after_sb_p after_sb_1p; |
b411b363 | 3140 | |
44ed167d | 3141 | rcu_read_lock(); |
69a22773 | 3142 | after_sb_1p = rcu_dereference(peer_device->connection->net_conf)->after_sb_1p; |
44ed167d PR |
3143 | rcu_read_unlock(); |
3144 | switch (after_sb_1p) { | |
b411b363 PR |
3145 | case ASB_DISCARD_YOUNGER_PRI: |
3146 | case ASB_DISCARD_OLDER_PRI: | |
3147 | case ASB_DISCARD_LEAST_CHG: | |
3148 | case ASB_DISCARD_LOCAL: | |
3149 | case ASB_DISCARD_REMOTE: | |
44ed167d | 3150 | case ASB_DISCARD_ZERO_CHG: |
d0180171 | 3151 | drbd_err(device, "Configuration error.\n"); |
b411b363 PR |
3152 | break; |
3153 | case ASB_DISCONNECT: | |
3154 | break; | |
3155 | case ASB_CONSENSUS: | |
69a22773 | 3156 | hg = drbd_asb_recover_0p(peer_device); |
b30ab791 | 3157 | if (hg == -1 && device->state.role == R_SECONDARY) |
b411b363 | 3158 | rv = hg; |
b30ab791 | 3159 | if (hg == 1 && device->state.role == R_PRIMARY) |
b411b363 PR |
3160 | rv = hg; |
3161 | break; | |
3162 | case ASB_VIOLENTLY: | |
69a22773 | 3163 | rv = drbd_asb_recover_0p(peer_device); |
b411b363 PR |
3164 | break; |
3165 | case ASB_DISCARD_SECONDARY: | |
b30ab791 | 3166 | return device->state.role == R_PRIMARY ? 1 : -1; |
b411b363 | 3167 | case ASB_CALL_HELPER: |
69a22773 | 3168 | hg = drbd_asb_recover_0p(peer_device); |
b30ab791 | 3169 | if (hg == -1 && device->state.role == R_PRIMARY) { |
bb437946 AG |
3170 | enum drbd_state_rv rv2; |
3171 | ||
b411b363 PR |
3172 | /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, |
3173 | * we might be here in C_WF_REPORT_PARAMS which is transient. | |
3174 | * we do not need to wait for the after state change work either. */ | |
b30ab791 | 3175 | rv2 = drbd_change_state(device, CS_VERBOSE, NS(role, R_SECONDARY)); |
bb437946 | 3176 | if (rv2 != SS_SUCCESS) { |
b30ab791 | 3177 | drbd_khelper(device, "pri-lost-after-sb"); |
b411b363 | 3178 | } else { |
d0180171 | 3179 | drbd_warn(device, "Successfully gave up primary role.\n"); |
b411b363 PR |
3180 | rv = hg; |
3181 | } | |
3182 | } else | |
3183 | rv = hg; | |
3184 | } | |
3185 | ||
3186 | return rv; | |
3187 | } | |
3188 | ||
69a22773 AG |
3189 | /** |
3190 | * drbd_asb_recover_2p - Recover after split-brain with two remaining primaries | |
3191 | */ | |
3192 | static int drbd_asb_recover_2p(struct drbd_peer_device *peer_device) __must_hold(local) | |
b411b363 | 3193 | { |
69a22773 | 3194 | struct drbd_device *device = peer_device->device; |
6184ea21 | 3195 | int hg, rv = -100; |
44ed167d | 3196 | enum drbd_after_sb_p after_sb_2p; |
b411b363 | 3197 | |
44ed167d | 3198 | rcu_read_lock(); |
69a22773 | 3199 | after_sb_2p = rcu_dereference(peer_device->connection->net_conf)->after_sb_2p; |
44ed167d PR |
3200 | rcu_read_unlock(); |
3201 | switch (after_sb_2p) { | |
b411b363 PR |
3202 | case ASB_DISCARD_YOUNGER_PRI: |
3203 | case ASB_DISCARD_OLDER_PRI: | |
3204 | case ASB_DISCARD_LEAST_CHG: | |
3205 | case ASB_DISCARD_LOCAL: | |
3206 | case ASB_DISCARD_REMOTE: | |
3207 | case ASB_CONSENSUS: | |
3208 | case ASB_DISCARD_SECONDARY: | |
44ed167d | 3209 | case ASB_DISCARD_ZERO_CHG: |
d0180171 | 3210 | drbd_err(device, "Configuration error.\n"); |
b411b363 PR |
3211 | break; |
3212 | case ASB_VIOLENTLY: | |
69a22773 | 3213 | rv = drbd_asb_recover_0p(peer_device); |
b411b363 PR |
3214 | break; |
3215 | case ASB_DISCONNECT: | |
3216 | break; | |
3217 | case ASB_CALL_HELPER: | |
69a22773 | 3218 | hg = drbd_asb_recover_0p(peer_device); |
b411b363 | 3219 | if (hg == -1) { |
bb437946 AG |
3220 | enum drbd_state_rv rv2; |
3221 | ||
b411b363 PR |
3222 | /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, |
3223 | * we might be here in C_WF_REPORT_PARAMS which is transient. | |
3224 | * we do not need to wait for the after state change work either. */ | |
b30ab791 | 3225 | rv2 = drbd_change_state(device, CS_VERBOSE, NS(role, R_SECONDARY)); |
bb437946 | 3226 | if (rv2 != SS_SUCCESS) { |
b30ab791 | 3227 | drbd_khelper(device, "pri-lost-after-sb"); |
b411b363 | 3228 | } else { |
d0180171 | 3229 | drbd_warn(device, "Successfully gave up primary role.\n"); |
b411b363 PR |
3230 | rv = hg; |
3231 | } | |
3232 | } else | |
3233 | rv = hg; | |
3234 | } | |
3235 | ||
3236 | return rv; | |
3237 | } | |
3238 | ||
b30ab791 | 3239 | static void drbd_uuid_dump(struct drbd_device *device, char *text, u64 *uuid, |
b411b363 PR |
3240 | u64 bits, u64 flags) |
3241 | { | |
3242 | if (!uuid) { | |
d0180171 | 3243 | drbd_info(device, "%s uuid info vanished while I was looking!\n", text); |
b411b363 PR |
3244 | return; |
3245 | } | |
d0180171 | 3246 | drbd_info(device, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n", |
b411b363 PR |
3247 | text, |
3248 | (unsigned long long)uuid[UI_CURRENT], | |
3249 | (unsigned long long)uuid[UI_BITMAP], | |
3250 | (unsigned long long)uuid[UI_HISTORY_START], | |
3251 | (unsigned long long)uuid[UI_HISTORY_END], | |
3252 | (unsigned long long)bits, | |
3253 | (unsigned long long)flags); | |
3254 | } | |
3255 | ||
3256 | /* | |
3257 | 100 after split brain try auto recover | |
3258 | 2 C_SYNC_SOURCE set BitMap | |
3259 | 1 C_SYNC_SOURCE use BitMap | |
3260 | 0 no Sync | |
3261 | -1 C_SYNC_TARGET use BitMap | |
3262 | -2 C_SYNC_TARGET set BitMap | |
3263 | -100 after split brain, disconnect | |
3264 | -1000 unrelated data | |
4a23f264 PR |
3265 | -1091 requires proto 91 |
3266 | -1096 requires proto 96 | |
b411b363 | 3267 | */ |
f2d3d75b LE |
3268 | |
3269 | static int drbd_uuid_compare(struct drbd_device *const device, enum drbd_role const peer_role, int *rule_nr) __must_hold(local) | |
b411b363 | 3270 | { |
44a4d551 LE |
3271 | struct drbd_peer_device *const peer_device = first_peer_device(device); |
3272 | struct drbd_connection *const connection = peer_device ? peer_device->connection : NULL; | |
b411b363 PR |
3273 | u64 self, peer; |
3274 | int i, j; | |
3275 | ||
b30ab791 AG |
3276 | self = device->ldev->md.uuid[UI_CURRENT] & ~((u64)1); |
3277 | peer = device->p_uuid[UI_CURRENT] & ~((u64)1); | |
b411b363 PR |
3278 | |
3279 | *rule_nr = 10; | |
3280 | if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) | |
3281 | return 0; | |
3282 | ||
3283 | *rule_nr = 20; | |
3284 | if ((self == UUID_JUST_CREATED || self == (u64)0) && | |
3285 | peer != UUID_JUST_CREATED) | |
3286 | return -2; | |
3287 | ||
3288 | *rule_nr = 30; | |
3289 | if (self != UUID_JUST_CREATED && | |
3290 | (peer == UUID_JUST_CREATED || peer == (u64)0)) | |
3291 | return 2; | |
3292 | ||
3293 | if (self == peer) { | |
3294 | int rct, dc; /* roles at crash time */ | |
3295 | ||
b30ab791 | 3296 | if (device->p_uuid[UI_BITMAP] == (u64)0 && device->ldev->md.uuid[UI_BITMAP] != (u64)0) { |
b411b363 | 3297 | |
44a4d551 | 3298 | if (connection->agreed_pro_version < 91) |
4a23f264 | 3299 | return -1091; |
b411b363 | 3300 | |
b30ab791 AG |
3301 | if ((device->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (device->p_uuid[UI_HISTORY_START] & ~((u64)1)) && |
3302 | (device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (device->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { | |
d0180171 | 3303 | drbd_info(device, "was SyncSource, missed the resync finished event, corrected myself:\n"); |
b30ab791 AG |
3304 | drbd_uuid_move_history(device); |
3305 | device->ldev->md.uuid[UI_HISTORY_START] = device->ldev->md.uuid[UI_BITMAP]; | |
3306 | device->ldev->md.uuid[UI_BITMAP] = 0; | |
b411b363 | 3307 | |
b30ab791 AG |
3308 | drbd_uuid_dump(device, "self", device->ldev->md.uuid, |
3309 | device->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(device) : 0, 0); | |
b411b363 PR |
3310 | *rule_nr = 34; |
3311 | } else { | |
d0180171 | 3312 | drbd_info(device, "was SyncSource (peer failed to write sync_uuid)\n"); |
b411b363 PR |
3313 | *rule_nr = 36; |
3314 | } | |
3315 | ||
3316 | return 1; | |
3317 | } | |
3318 | ||
b30ab791 | 3319 | if (device->ldev->md.uuid[UI_BITMAP] == (u64)0 && device->p_uuid[UI_BITMAP] != (u64)0) { |
b411b363 | 3320 | |
44a4d551 | 3321 | if (connection->agreed_pro_version < 91) |
4a23f264 | 3322 | return -1091; |
b411b363 | 3323 | |
b30ab791 AG |
3324 | if ((device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (device->p_uuid[UI_BITMAP] & ~((u64)1)) && |
3325 | (device->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (device->p_uuid[UI_HISTORY_START] & ~((u64)1))) { | |
d0180171 | 3326 | drbd_info(device, "was SyncTarget, peer missed the resync finished event, corrected peer:\n"); |
b411b363 | 3327 | |
b30ab791 AG |
3328 | device->p_uuid[UI_HISTORY_START + 1] = device->p_uuid[UI_HISTORY_START]; |
3329 | device->p_uuid[UI_HISTORY_START] = device->p_uuid[UI_BITMAP]; | |
3330 | device->p_uuid[UI_BITMAP] = 0UL; | |
b411b363 | 3331 | |
b30ab791 | 3332 | drbd_uuid_dump(device, "peer", device->p_uuid, device->p_uuid[UI_SIZE], device->p_uuid[UI_FLAGS]); |
b411b363 PR |
3333 | *rule_nr = 35; |
3334 | } else { | |
d0180171 | 3335 | drbd_info(device, "was SyncTarget (failed to write sync_uuid)\n"); |
b411b363 PR |
3336 | *rule_nr = 37; |
3337 | } | |
3338 | ||
3339 | return -1; | |
3340 | } | |
3341 | ||
3342 | /* Common power [off|failure] */ | |
b30ab791 AG |
3343 | rct = (test_bit(CRASHED_PRIMARY, &device->flags) ? 1 : 0) + |
3344 | (device->p_uuid[UI_FLAGS] & 2); | |
b411b363 PR |
3345 | /* lowest bit is set when we were primary, |
3346 | * next bit (weight 2) is set when peer was primary */ | |
3347 | *rule_nr = 40; | |
3348 | ||
f2d3d75b LE |
3349 | /* Neither has the "crashed primary" flag set, |
3350 | * only a replication link hickup. */ | |
3351 | if (rct == 0) | |
3352 | return 0; | |
3353 | ||
3354 | /* Current UUID equal and no bitmap uuid; does not necessarily | |
3355 | * mean this was a "simultaneous hard crash", maybe IO was | |
3356 | * frozen, so no UUID-bump happened. | |
3357 | * This is a protocol change, overload DRBD_FF_WSAME as flag | |
3358 | * for "new-enough" peer DRBD version. */ | |
3359 | if (device->state.role == R_PRIMARY || peer_role == R_PRIMARY) { | |
3360 | *rule_nr = 41; | |
3361 | if (!(connection->agreed_features & DRBD_FF_WSAME)) { | |
3362 | drbd_warn(peer_device, "Equivalent unrotated UUIDs, but current primary present.\n"); | |
3363 | return -(0x10000 | PRO_VERSION_MAX | (DRBD_FF_WSAME << 8)); | |
3364 | } | |
3365 | if (device->state.role == R_PRIMARY && peer_role == R_PRIMARY) { | |
3366 | /* At least one has the "crashed primary" bit set, | |
3367 | * both are primary now, but neither has rotated its UUIDs? | |
3368 | * "Can not happen." */ | |
3369 | drbd_err(peer_device, "Equivalent unrotated UUIDs, but both are primary. Can not resolve this.\n"); | |
3370 | return -100; | |
3371 | } | |
3372 | if (device->state.role == R_PRIMARY) | |
3373 | return 1; | |
3374 | return -1; | |
3375 | } | |
3376 | ||
3377 | /* Both are secondary. | |
3378 | * Really looks like recovery from simultaneous hard crash. | |
3379 | * Check which had been primary before, and arbitrate. */ | |
b411b363 | 3380 | switch (rct) { |
f2d3d75b | 3381 | case 0: /* !self_pri && !peer_pri */ return 0; /* already handled */ |
b411b363 PR |
3382 | case 1: /* self_pri && !peer_pri */ return 1; |
3383 | case 2: /* !self_pri && peer_pri */ return -1; | |
3384 | case 3: /* self_pri && peer_pri */ | |
44a4d551 | 3385 | dc = test_bit(RESOLVE_CONFLICTS, &connection->flags); |
b411b363 PR |
3386 | return dc ? -1 : 1; |
3387 | } | |
3388 | } | |
3389 | ||
3390 | *rule_nr = 50; | |
b30ab791 | 3391 | peer = device->p_uuid[UI_BITMAP] & ~((u64)1); |
b411b363 PR |
3392 | if (self == peer) |
3393 | return -1; | |
3394 | ||
3395 | *rule_nr = 51; | |
b30ab791 | 3396 | peer = device->p_uuid[UI_HISTORY_START] & ~((u64)1); |
b411b363 | 3397 | if (self == peer) { |
44a4d551 | 3398 | if (connection->agreed_pro_version < 96 ? |
b30ab791 AG |
3399 | (device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == |
3400 | (device->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) : | |
3401 | peer + UUID_NEW_BM_OFFSET == (device->p_uuid[UI_BITMAP] & ~((u64)1))) { | |
b411b363 PR |
3402 | /* The last P_SYNC_UUID did not get though. Undo the last start of |
3403 | resync as sync source modifications of the peer's UUIDs. */ | |
3404 | ||
44a4d551 | 3405 | if (connection->agreed_pro_version < 91) |
4a23f264 | 3406 | return -1091; |
b411b363 | 3407 | |
b30ab791 AG |
3408 | device->p_uuid[UI_BITMAP] = device->p_uuid[UI_HISTORY_START]; |
3409 | device->p_uuid[UI_HISTORY_START] = device->p_uuid[UI_HISTORY_START + 1]; | |
4a23f264 | 3410 | |
d0180171 | 3411 | drbd_info(device, "Lost last syncUUID packet, corrected:\n"); |
b30ab791 | 3412 | drbd_uuid_dump(device, "peer", device->p_uuid, device->p_uuid[UI_SIZE], device->p_uuid[UI_FLAGS]); |
4a23f264 | 3413 | |
b411b363 PR |
3414 | return -1; |
3415 | } | |
3416 | } | |
3417 | ||
3418 | *rule_nr = 60; | |
b30ab791 | 3419 | self = device->ldev->md.uuid[UI_CURRENT] & ~((u64)1); |
b411b363 | 3420 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { |
b30ab791 | 3421 | peer = device->p_uuid[i] & ~((u64)1); |
b411b363 PR |
3422 | if (self == peer) |
3423 | return -2; | |
3424 | } | |
3425 | ||
3426 | *rule_nr = 70; | |
b30ab791 AG |
3427 | self = device->ldev->md.uuid[UI_BITMAP] & ~((u64)1); |
3428 | peer = device->p_uuid[UI_CURRENT] & ~((u64)1); | |
b411b363 PR |
3429 | if (self == peer) |
3430 | return 1; | |
3431 | ||
3432 | *rule_nr = 71; | |
b30ab791 | 3433 | self = device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); |
b411b363 | 3434 | if (self == peer) { |
44a4d551 | 3435 | if (connection->agreed_pro_version < 96 ? |
b30ab791 AG |
3436 | (device->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == |
3437 | (device->p_uuid[UI_HISTORY_START] & ~((u64)1)) : | |
3438 | self + UUID_NEW_BM_OFFSET == (device->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) { | |
b411b363 PR |
3439 | /* The last P_SYNC_UUID did not get though. Undo the last start of |
3440 | resync as sync source modifications of our UUIDs. */ | |
3441 | ||
44a4d551 | 3442 | if (connection->agreed_pro_version < 91) |
4a23f264 | 3443 | return -1091; |
b411b363 | 3444 | |
b30ab791 AG |
3445 | __drbd_uuid_set(device, UI_BITMAP, device->ldev->md.uuid[UI_HISTORY_START]); |
3446 | __drbd_uuid_set(device, UI_HISTORY_START, device->ldev->md.uuid[UI_HISTORY_START + 1]); | |
b411b363 | 3447 | |
d0180171 | 3448 | drbd_info(device, "Last syncUUID did not get through, corrected:\n"); |
b30ab791 AG |
3449 | drbd_uuid_dump(device, "self", device->ldev->md.uuid, |
3450 | device->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(device) : 0, 0); | |
b411b363 PR |
3451 | |
3452 | return 1; | |
3453 | } | |
3454 | } | |
3455 | ||
3456 | ||
3457 | *rule_nr = 80; | |
b30ab791 | 3458 | peer = device->p_uuid[UI_CURRENT] & ~((u64)1); |
b411b363 | 3459 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { |
b30ab791 | 3460 | self = device->ldev->md.uuid[i] & ~((u64)1); |
b411b363 PR |
3461 | if (self == peer) |
3462 | return 2; | |
3463 | } | |
3464 | ||
3465 | *rule_nr = 90; | |
b30ab791 AG |
3466 | self = device->ldev->md.uuid[UI_BITMAP] & ~((u64)1); |
3467 | peer = device->p_uuid[UI_BITMAP] & ~((u64)1); | |
b411b363 PR |
3468 | if (self == peer && self != ((u64)0)) |
3469 | return 100; | |
3470 | ||
3471 | *rule_nr = 100; | |
3472 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { | |
b30ab791 | 3473 | self = device->ldev->md.uuid[i] & ~((u64)1); |
b411b363 | 3474 | for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { |
b30ab791 | 3475 | peer = device->p_uuid[j] & ~((u64)1); |
b411b363 PR |
3476 | if (self == peer) |
3477 | return -100; | |
3478 | } | |
3479 | } | |
3480 | ||
3481 | return -1000; | |
3482 | } | |
3483 | ||
3484 | /* drbd_sync_handshake() returns the new conn state on success, or | |
3485 | CONN_MASK (-1) on failure. | |
3486 | */ | |
69a22773 AG |
3487 | static enum drbd_conns drbd_sync_handshake(struct drbd_peer_device *peer_device, |
3488 | enum drbd_role peer_role, | |
b411b363 PR |
3489 | enum drbd_disk_state peer_disk) __must_hold(local) |
3490 | { | |
69a22773 | 3491 | struct drbd_device *device = peer_device->device; |
b411b363 PR |
3492 | enum drbd_conns rv = C_MASK; |
3493 | enum drbd_disk_state mydisk; | |
44ed167d | 3494 | struct net_conf *nc; |
d29e89e3 | 3495 | int hg, rule_nr, rr_conflict, tentative, always_asbp; |
b411b363 | 3496 | |
b30ab791 | 3497 | mydisk = device->state.disk; |
b411b363 | 3498 | if (mydisk == D_NEGOTIATING) |
b30ab791 | 3499 | mydisk = device->new_state_tmp.disk; |
b411b363 | 3500 | |
d0180171 | 3501 | drbd_info(device, "drbd_sync_handshake:\n"); |
9f2247bb | 3502 | |
b30ab791 AG |
3503 | spin_lock_irq(&device->ldev->md.uuid_lock); |
3504 | drbd_uuid_dump(device, "self", device->ldev->md.uuid, device->comm_bm_set, 0); | |
3505 | drbd_uuid_dump(device, "peer", device->p_uuid, | |
3506 | device->p_uuid[UI_SIZE], device->p_uuid[UI_FLAGS]); | |
b411b363 | 3507 | |
f2d3d75b | 3508 | hg = drbd_uuid_compare(device, peer_role, &rule_nr); |
b30ab791 | 3509 | spin_unlock_irq(&device->ldev->md.uuid_lock); |
b411b363 | 3510 | |
d0180171 | 3511 | drbd_info(device, "uuid_compare()=%d by rule %d\n", hg, rule_nr); |
b411b363 PR |
3512 | |
3513 | if (hg == -1000) { | |
d0180171 | 3514 | drbd_alert(device, "Unrelated data, aborting!\n"); |
b411b363 PR |
3515 | return C_MASK; |
3516 | } | |
f2d3d75b LE |
3517 | if (hg < -0x10000) { |
3518 | int proto, fflags; | |
3519 | hg = -hg; | |
3520 | proto = hg & 0xff; | |
3521 | fflags = (hg >> 8) & 0xff; | |
3522 | drbd_alert(device, "To resolve this both sides have to support at least protocol %d and feature flags 0x%x\n", | |
3523 | proto, fflags); | |
3524 | return C_MASK; | |
3525 | } | |
4a23f264 | 3526 | if (hg < -1000) { |
d0180171 | 3527 | drbd_alert(device, "To resolve this both sides have to support at least protocol %d\n", -hg - 1000); |
b411b363 PR |
3528 | return C_MASK; |
3529 | } | |
3530 | ||
3531 | if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || | |
3532 | (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { | |
3533 | int f = (hg == -100) || abs(hg) == 2; | |
3534 | hg = mydisk > D_INCONSISTENT ? 1 : -1; | |
3535 | if (f) | |
3536 | hg = hg*2; | |
d0180171 | 3537 | drbd_info(device, "Becoming sync %s due to disk states.\n", |
b411b363 PR |
3538 | hg > 0 ? "source" : "target"); |
3539 | } | |
3540 | ||
3a11a487 | 3541 | if (abs(hg) == 100) |
b30ab791 | 3542 | drbd_khelper(device, "initial-split-brain"); |
3a11a487 | 3543 | |
44ed167d | 3544 | rcu_read_lock(); |
69a22773 | 3545 | nc = rcu_dereference(peer_device->connection->net_conf); |
d29e89e3 RK |
3546 | always_asbp = nc->always_asbp; |
3547 | rr_conflict = nc->rr_conflict; | |
3548 | tentative = nc->tentative; | |
3549 | rcu_read_unlock(); | |
44ed167d | 3550 | |
d29e89e3 | 3551 | if (hg == 100 || (hg == -100 && always_asbp)) { |
b30ab791 | 3552 | int pcount = (device->state.role == R_PRIMARY) |
b411b363 PR |
3553 | + (peer_role == R_PRIMARY); |
3554 | int forced = (hg == -100); | |
3555 | ||
3556 | switch (pcount) { | |
3557 | case 0: | |
69a22773 | 3558 | hg = drbd_asb_recover_0p(peer_device); |
b411b363 PR |
3559 | break; |
3560 | case 1: | |
69a22773 | 3561 | hg = drbd_asb_recover_1p(peer_device); |
b411b363 PR |
3562 | break; |
3563 | case 2: | |
69a22773 | 3564 | hg = drbd_asb_recover_2p(peer_device); |
b411b363 PR |
3565 | break; |
3566 | } | |
3567 | if (abs(hg) < 100) { | |
d0180171 | 3568 | drbd_warn(device, "Split-Brain detected, %d primaries, " |
b411b363 PR |
3569 | "automatically solved. Sync from %s node\n", |
3570 | pcount, (hg < 0) ? "peer" : "this"); | |
3571 | if (forced) { | |
d0180171 | 3572 | drbd_warn(device, "Doing a full sync, since" |
b411b363 PR |
3573 | " UUIDs where ambiguous.\n"); |
3574 | hg = hg*2; | |
3575 | } | |
3576 | } | |
3577 | } | |
3578 | ||
3579 | if (hg == -100) { | |
b30ab791 | 3580 | if (test_bit(DISCARD_MY_DATA, &device->flags) && !(device->p_uuid[UI_FLAGS]&1)) |
b411b363 | 3581 | hg = -1; |
b30ab791 | 3582 | if (!test_bit(DISCARD_MY_DATA, &device->flags) && (device->p_uuid[UI_FLAGS]&1)) |
b411b363 PR |
3583 | hg = 1; |
3584 | ||
3585 | if (abs(hg) < 100) | |
d0180171 | 3586 | drbd_warn(device, "Split-Brain detected, manually solved. " |
b411b363 PR |
3587 | "Sync from %s node\n", |
3588 | (hg < 0) ? "peer" : "this"); | |
3589 | } | |
3590 | ||
3591 | if (hg == -100) { | |
580b9767 LE |
3592 | /* FIXME this log message is not correct if we end up here |
3593 | * after an attempted attach on a diskless node. | |
3594 | * We just refuse to attach -- well, we drop the "connection" | |
3595 | * to that disk, in a way... */ | |
d0180171 | 3596 | drbd_alert(device, "Split-Brain detected but unresolved, dropping connection!\n"); |
b30ab791 | 3597 | drbd_khelper(device, "split-brain"); |
b411b363 PR |
3598 | return C_MASK; |
3599 | } | |
3600 | ||
3601 | if (hg > 0 && mydisk <= D_INCONSISTENT) { | |
d0180171 | 3602 | drbd_err(device, "I shall become SyncSource, but I am inconsistent!\n"); |
b411b363 PR |
3603 | return C_MASK; |
3604 | } | |
3605 | ||
3606 | if (hg < 0 && /* by intention we do not use mydisk here. */ | |
b30ab791 | 3607 | device->state.role == R_PRIMARY && device->state.disk >= D_CONSISTENT) { |
44ed167d | 3608 | switch (rr_conflict) { |
b411b363 | 3609 | case ASB_CALL_HELPER: |
b30ab791 | 3610 | drbd_khelper(device, "pri-lost"); |
df561f66 | 3611 | fallthrough; |
b411b363 | 3612 | case ASB_DISCONNECT: |
d0180171 | 3613 | drbd_err(device, "I shall become SyncTarget, but I am primary!\n"); |
b411b363 PR |
3614 | return C_MASK; |
3615 | case ASB_VIOLENTLY: | |
d0180171 | 3616 | drbd_warn(device, "Becoming SyncTarget, violating the stable-data" |
b411b363 PR |
3617 | "assumption\n"); |
3618 | } | |
3619 | } | |
3620 | ||
69a22773 | 3621 | if (tentative || test_bit(CONN_DRY_RUN, &peer_device->connection->flags)) { |
cf14c2e9 | 3622 | if (hg == 0) |
d0180171 | 3623 | drbd_info(device, "dry-run connect: No resync, would become Connected immediately.\n"); |
cf14c2e9 | 3624 | else |
d0180171 | 3625 | drbd_info(device, "dry-run connect: Would become %s, doing a %s resync.", |
cf14c2e9 PR |
3626 | drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), |
3627 | abs(hg) >= 2 ? "full" : "bit-map based"); | |
3628 | return C_MASK; | |
3629 | } | |
3630 | ||
b411b363 | 3631 | if (abs(hg) >= 2) { |
d0180171 | 3632 | drbd_info(device, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n"); |
b30ab791 | 3633 | if (drbd_bitmap_io(device, &drbd_bmio_set_n_write, "set_n_write from sync_handshake", |
20ceb2b2 | 3634 | BM_LOCKED_SET_ALLOWED)) |
b411b363 PR |
3635 | return C_MASK; |
3636 | } | |
3637 | ||
3638 | if (hg > 0) { /* become sync source. */ | |
3639 | rv = C_WF_BITMAP_S; | |
3640 | } else if (hg < 0) { /* become sync target */ | |
3641 | rv = C_WF_BITMAP_T; | |
3642 | } else { | |
3643 | rv = C_CONNECTED; | |
b30ab791 | 3644 | if (drbd_bm_total_weight(device)) { |
d0180171 | 3645 | drbd_info(device, "No resync, but %lu bits in bitmap!\n", |
b30ab791 | 3646 | drbd_bm_total_weight(device)); |
b411b363 PR |
3647 | } |
3648 | } | |
3649 | ||
3650 | return rv; | |
3651 | } | |
3652 | ||
f179d76d | 3653 | static enum drbd_after_sb_p convert_after_sb(enum drbd_after_sb_p peer) |
b411b363 PR |
3654 | { |
3655 | /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ | |
f179d76d PR |
3656 | if (peer == ASB_DISCARD_REMOTE) |
3657 | return ASB_DISCARD_LOCAL; | |
b411b363 PR |
3658 | |
3659 | /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ | |
f179d76d PR |
3660 | if (peer == ASB_DISCARD_LOCAL) |
3661 | return ASB_DISCARD_REMOTE; | |
b411b363 PR |
3662 | |
3663 | /* everything else is valid if they are equal on both sides. */ | |
f179d76d | 3664 | return peer; |
b411b363 PR |
3665 | } |
3666 | ||
bde89a9e | 3667 | static int receive_protocol(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 3668 | { |
e658983a | 3669 | struct p_protocol *p = pi->data; |
036b17ea PR |
3670 | enum drbd_after_sb_p p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; |
3671 | int p_proto, p_discard_my_data, p_two_primaries, cf; | |
3672 | struct net_conf *nc, *old_net_conf, *new_net_conf = NULL; | |
3673 | char integrity_alg[SHARED_SECRET_MAX] = ""; | |
3d0e6375 | 3674 | struct crypto_shash *peer_integrity_tfm = NULL; |
7aca6c75 | 3675 | void *int_dig_in = NULL, *int_dig_vv = NULL; |
b411b363 | 3676 | |
b411b363 PR |
3677 | p_proto = be32_to_cpu(p->protocol); |
3678 | p_after_sb_0p = be32_to_cpu(p->after_sb_0p); | |
3679 | p_after_sb_1p = be32_to_cpu(p->after_sb_1p); | |
3680 | p_after_sb_2p = be32_to_cpu(p->after_sb_2p); | |
b411b363 | 3681 | p_two_primaries = be32_to_cpu(p->two_primaries); |
cf14c2e9 | 3682 | cf = be32_to_cpu(p->conn_flags); |
6139f60d | 3683 | p_discard_my_data = cf & CF_DISCARD_MY_DATA; |
cf14c2e9 | 3684 | |
bde89a9e | 3685 | if (connection->agreed_pro_version >= 87) { |
86db0618 | 3686 | int err; |
cf14c2e9 | 3687 | |
88104ca4 | 3688 | if (pi->size > sizeof(integrity_alg)) |
86db0618 | 3689 | return -EIO; |
bde89a9e | 3690 | err = drbd_recv_all(connection, integrity_alg, pi->size); |
86db0618 AG |
3691 | if (err) |
3692 | return err; | |
036b17ea | 3693 | integrity_alg[SHARED_SECRET_MAX - 1] = 0; |
b411b363 PR |
3694 | } |
3695 | ||
7d4c782c | 3696 | if (pi->cmd != P_PROTOCOL_UPDATE) { |
bde89a9e | 3697 | clear_bit(CONN_DRY_RUN, &connection->flags); |
b411b363 | 3698 | |
fbc12f45 | 3699 | if (cf & CF_DRY_RUN) |
bde89a9e | 3700 | set_bit(CONN_DRY_RUN, &connection->flags); |
b411b363 | 3701 | |
fbc12f45 | 3702 | rcu_read_lock(); |
bde89a9e | 3703 | nc = rcu_dereference(connection->net_conf); |
b411b363 | 3704 | |
fbc12f45 | 3705 | if (p_proto != nc->wire_protocol) { |
1ec861eb | 3706 | drbd_err(connection, "incompatible %s settings\n", "protocol"); |
fbc12f45 AG |
3707 | goto disconnect_rcu_unlock; |
3708 | } | |
b411b363 | 3709 | |
fbc12f45 | 3710 | if (convert_after_sb(p_after_sb_0p) != nc->after_sb_0p) { |
1ec861eb | 3711 | drbd_err(connection, "incompatible %s settings\n", "after-sb-0pri"); |
fbc12f45 AG |
3712 | goto disconnect_rcu_unlock; |
3713 | } | |
b411b363 | 3714 | |
fbc12f45 | 3715 | if (convert_after_sb(p_after_sb_1p) != nc->after_sb_1p) { |
1ec861eb | 3716 | drbd_err(connection, "incompatible %s settings\n", "after-sb-1pri"); |
fbc12f45 AG |
3717 | goto disconnect_rcu_unlock; |
3718 | } | |
b411b363 | 3719 | |
fbc12f45 | 3720 | if (convert_after_sb(p_after_sb_2p) != nc->after_sb_2p) { |
1ec861eb | 3721 | drbd_err(connection, "incompatible %s settings\n", "after-sb-2pri"); |
fbc12f45 AG |
3722 | goto disconnect_rcu_unlock; |
3723 | } | |
b411b363 | 3724 | |
fbc12f45 | 3725 | if (p_discard_my_data && nc->discard_my_data) { |
1ec861eb | 3726 | drbd_err(connection, "incompatible %s settings\n", "discard-my-data"); |
fbc12f45 AG |
3727 | goto disconnect_rcu_unlock; |
3728 | } | |
b411b363 | 3729 | |
fbc12f45 | 3730 | if (p_two_primaries != nc->two_primaries) { |
1ec861eb | 3731 | drbd_err(connection, "incompatible %s settings\n", "allow-two-primaries"); |
fbc12f45 AG |
3732 | goto disconnect_rcu_unlock; |
3733 | } | |
b411b363 | 3734 | |
fbc12f45 | 3735 | if (strcmp(integrity_alg, nc->integrity_alg)) { |
1ec861eb | 3736 | drbd_err(connection, "incompatible %s settings\n", "data-integrity-alg"); |
fbc12f45 AG |
3737 | goto disconnect_rcu_unlock; |
3738 | } | |
b411b363 | 3739 | |
fbc12f45 | 3740 | rcu_read_unlock(); |
b411b363 PR |
3741 | } |
3742 | ||
7d4c782c AG |
3743 | if (integrity_alg[0]) { |
3744 | int hash_size; | |
3745 | ||
3746 | /* | |
3747 | * We can only change the peer data integrity algorithm | |
3748 | * here. Changing our own data integrity algorithm | |
3749 | * requires that we send a P_PROTOCOL_UPDATE packet at | |
3750 | * the same time; otherwise, the peer has no way to | |
3751 | * tell between which packets the algorithm should | |
3752 | * change. | |
3753 | */ | |
b411b363 | 3754 | |
3d234b33 | 3755 | peer_integrity_tfm = crypto_alloc_shash(integrity_alg, 0, 0); |
1b57e663 LE |
3756 | if (IS_ERR(peer_integrity_tfm)) { |
3757 | peer_integrity_tfm = NULL; | |
1ec861eb | 3758 | drbd_err(connection, "peer data-integrity-alg %s not supported\n", |
7d4c782c AG |
3759 | integrity_alg); |
3760 | goto disconnect; | |
3761 | } | |
b411b363 | 3762 | |
3d0e6375 | 3763 | hash_size = crypto_shash_digestsize(peer_integrity_tfm); |
7d4c782c AG |
3764 | int_dig_in = kmalloc(hash_size, GFP_KERNEL); |
3765 | int_dig_vv = kmalloc(hash_size, GFP_KERNEL); | |
3766 | if (!(int_dig_in && int_dig_vv)) { | |
1ec861eb | 3767 | drbd_err(connection, "Allocation of buffers for data integrity checking failed\n"); |
b411b363 PR |
3768 | goto disconnect; |
3769 | } | |
b411b363 PR |
3770 | } |
3771 | ||
7d4c782c AG |
3772 | new_net_conf = kmalloc(sizeof(struct net_conf), GFP_KERNEL); |
3773 | if (!new_net_conf) { | |
1ec861eb | 3774 | drbd_err(connection, "Allocation of new net_conf failed\n"); |
7d4c782c AG |
3775 | goto disconnect; |
3776 | } | |
3777 | ||
bde89a9e | 3778 | mutex_lock(&connection->data.mutex); |
0500813f | 3779 | mutex_lock(&connection->resource->conf_update); |
bde89a9e | 3780 | old_net_conf = connection->net_conf; |
7d4c782c AG |
3781 | *new_net_conf = *old_net_conf; |
3782 | ||
3783 | new_net_conf->wire_protocol = p_proto; | |
3784 | new_net_conf->after_sb_0p = convert_after_sb(p_after_sb_0p); | |
3785 | new_net_conf->after_sb_1p = convert_after_sb(p_after_sb_1p); | |
3786 | new_net_conf->after_sb_2p = convert_after_sb(p_after_sb_2p); | |
3787 | new_net_conf->two_primaries = p_two_primaries; | |
3788 | ||
bde89a9e | 3789 | rcu_assign_pointer(connection->net_conf, new_net_conf); |
0500813f | 3790 | mutex_unlock(&connection->resource->conf_update); |
bde89a9e | 3791 | mutex_unlock(&connection->data.mutex); |
7d4c782c | 3792 | |
3d0e6375 | 3793 | crypto_free_shash(connection->peer_integrity_tfm); |
bde89a9e AG |
3794 | kfree(connection->int_dig_in); |
3795 | kfree(connection->int_dig_vv); | |
3796 | connection->peer_integrity_tfm = peer_integrity_tfm; | |
3797 | connection->int_dig_in = int_dig_in; | |
3798 | connection->int_dig_vv = int_dig_vv; | |
7d4c782c AG |
3799 | |
3800 | if (strcmp(old_net_conf->integrity_alg, integrity_alg)) | |
1ec861eb | 3801 | drbd_info(connection, "peer data-integrity-alg: %s\n", |
7d4c782c AG |
3802 | integrity_alg[0] ? integrity_alg : "(none)"); |
3803 | ||
3804 | synchronize_rcu(); | |
3805 | kfree(old_net_conf); | |
82bc0194 | 3806 | return 0; |
b411b363 | 3807 | |
44ed167d PR |
3808 | disconnect_rcu_unlock: |
3809 | rcu_read_unlock(); | |
b411b363 | 3810 | disconnect: |
3d0e6375 | 3811 | crypto_free_shash(peer_integrity_tfm); |
036b17ea PR |
3812 | kfree(int_dig_in); |
3813 | kfree(int_dig_vv); | |
bde89a9e | 3814 | conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 3815 | return -EIO; |
b411b363 PR |
3816 | } |
3817 | ||
3818 | /* helper function | |
3819 | * input: alg name, feature name | |
3820 | * return: NULL (alg name was "") | |
3821 | * ERR_PTR(error) if something goes wrong | |
3822 | * or the crypto hash ptr, if it worked out ok. */ | |
3d0e6375 KC |
3823 | static struct crypto_shash *drbd_crypto_alloc_digest_safe( |
3824 | const struct drbd_device *device, | |
b411b363 PR |
3825 | const char *alg, const char *name) |
3826 | { | |
3d0e6375 | 3827 | struct crypto_shash *tfm; |
b411b363 PR |
3828 | |
3829 | if (!alg[0]) | |
3830 | return NULL; | |
3831 | ||
3d0e6375 | 3832 | tfm = crypto_alloc_shash(alg, 0, 0); |
b411b363 | 3833 | if (IS_ERR(tfm)) { |
d0180171 | 3834 | drbd_err(device, "Can not allocate \"%s\" as %s (reason: %ld)\n", |
b411b363 PR |
3835 | alg, name, PTR_ERR(tfm)); |
3836 | return tfm; | |
3837 | } | |
b411b363 PR |
3838 | return tfm; |
3839 | } | |
3840 | ||
bde89a9e | 3841 | static int ignore_remaining_packet(struct drbd_connection *connection, struct packet_info *pi) |
4a76b161 | 3842 | { |
bde89a9e | 3843 | void *buffer = connection->data.rbuf; |
4a76b161 AG |
3844 | int size = pi->size; |
3845 | ||
3846 | while (size) { | |
3847 | int s = min_t(int, size, DRBD_SOCKET_BUFFER_SIZE); | |
bde89a9e | 3848 | s = drbd_recv(connection, buffer, s); |
4a76b161 AG |
3849 | if (s <= 0) { |
3850 | if (s < 0) | |
3851 | return s; | |
3852 | break; | |
3853 | } | |
3854 | size -= s; | |
3855 | } | |
3856 | if (size) | |
3857 | return -EIO; | |
3858 | return 0; | |
3859 | } | |
3860 | ||
3861 | /* | |
3862 | * config_unknown_volume - device configuration command for unknown volume | |
3863 | * | |
3864 | * When a device is added to an existing connection, the node on which the | |
3865 | * device is added first will send configuration commands to its peer but the | |
3866 | * peer will not know about the device yet. It will warn and ignore these | |
3867 | * commands. Once the device is added on the second node, the second node will | |
3868 | * send the same device configuration commands, but in the other direction. | |
3869 | * | |
3870 | * (We can also end up here if drbd is misconfigured.) | |
3871 | */ | |
bde89a9e | 3872 | static int config_unknown_volume(struct drbd_connection *connection, struct packet_info *pi) |
4a76b161 | 3873 | { |
1ec861eb | 3874 | drbd_warn(connection, "%s packet received for volume %u, which is not configured locally\n", |
2fcb8f30 | 3875 | cmdname(pi->cmd), pi->vnr); |
bde89a9e | 3876 | return ignore_remaining_packet(connection, pi); |
4a76b161 AG |
3877 | } |
3878 | ||
bde89a9e | 3879 | static int receive_SyncParam(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 3880 | { |
9f4fe9ad | 3881 | struct drbd_peer_device *peer_device; |
b30ab791 | 3882 | struct drbd_device *device; |
e658983a | 3883 | struct p_rs_param_95 *p; |
b411b363 | 3884 | unsigned int header_size, data_size, exp_max_sz; |
3d0e6375 KC |
3885 | struct crypto_shash *verify_tfm = NULL; |
3886 | struct crypto_shash *csums_tfm = NULL; | |
2ec91e0e | 3887 | struct net_conf *old_net_conf, *new_net_conf = NULL; |
813472ce | 3888 | struct disk_conf *old_disk_conf = NULL, *new_disk_conf = NULL; |
bde89a9e | 3889 | const int apv = connection->agreed_pro_version; |
813472ce | 3890 | struct fifo_buffer *old_plan = NULL, *new_plan = NULL; |
6a365874 | 3891 | unsigned int fifo_size = 0; |
82bc0194 | 3892 | int err; |
b411b363 | 3893 | |
9f4fe9ad AG |
3894 | peer_device = conn_peer_device(connection, pi->vnr); |
3895 | if (!peer_device) | |
bde89a9e | 3896 | return config_unknown_volume(connection, pi); |
9f4fe9ad | 3897 | device = peer_device->device; |
b411b363 PR |
3898 | |
3899 | exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) | |
3900 | : apv == 88 ? sizeof(struct p_rs_param) | |
3901 | + SHARED_SECRET_MAX | |
8e26f9cc PR |
3902 | : apv <= 94 ? sizeof(struct p_rs_param_89) |
3903 | : /* apv >= 95 */ sizeof(struct p_rs_param_95); | |
b411b363 | 3904 | |
e2857216 | 3905 | if (pi->size > exp_max_sz) { |
d0180171 | 3906 | drbd_err(device, "SyncParam packet too long: received %u, expected <= %u bytes\n", |
e2857216 | 3907 | pi->size, exp_max_sz); |
82bc0194 | 3908 | return -EIO; |
b411b363 PR |
3909 | } |
3910 | ||
3911 | if (apv <= 88) { | |
e658983a | 3912 | header_size = sizeof(struct p_rs_param); |
e2857216 | 3913 | data_size = pi->size - header_size; |
8e26f9cc | 3914 | } else if (apv <= 94) { |
e658983a | 3915 | header_size = sizeof(struct p_rs_param_89); |
e2857216 | 3916 | data_size = pi->size - header_size; |
0b0ba1ef | 3917 | D_ASSERT(device, data_size == 0); |
8e26f9cc | 3918 | } else { |
e658983a | 3919 | header_size = sizeof(struct p_rs_param_95); |
e2857216 | 3920 | data_size = pi->size - header_size; |
0b0ba1ef | 3921 | D_ASSERT(device, data_size == 0); |
b411b363 PR |
3922 | } |
3923 | ||
3924 | /* initialize verify_alg and csums_alg */ | |
e658983a | 3925 | p = pi->data; |
b411b363 PR |
3926 | memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); |
3927 | ||
9f4fe9ad | 3928 | err = drbd_recv_all(peer_device->connection, p, header_size); |
82bc0194 AG |
3929 | if (err) |
3930 | return err; | |
b411b363 | 3931 | |
0500813f | 3932 | mutex_lock(&connection->resource->conf_update); |
9f4fe9ad | 3933 | old_net_conf = peer_device->connection->net_conf; |
b30ab791 | 3934 | if (get_ldev(device)) { |
813472ce PR |
3935 | new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); |
3936 | if (!new_disk_conf) { | |
b30ab791 | 3937 | put_ldev(device); |
0500813f | 3938 | mutex_unlock(&connection->resource->conf_update); |
d0180171 | 3939 | drbd_err(device, "Allocation of new disk_conf failed\n"); |
813472ce PR |
3940 | return -ENOMEM; |
3941 | } | |
daeda1cc | 3942 | |
b30ab791 | 3943 | old_disk_conf = device->ldev->disk_conf; |
813472ce | 3944 | *new_disk_conf = *old_disk_conf; |
b411b363 | 3945 | |
6394b935 | 3946 | new_disk_conf->resync_rate = be32_to_cpu(p->resync_rate); |
813472ce | 3947 | } |
b411b363 PR |
3948 | |
3949 | if (apv >= 88) { | |
3950 | if (apv == 88) { | |
5de73827 | 3951 | if (data_size > SHARED_SECRET_MAX || data_size == 0) { |
d0180171 | 3952 | drbd_err(device, "verify-alg of wrong size, " |
5de73827 PR |
3953 | "peer wants %u, accepting only up to %u byte\n", |
3954 | data_size, SHARED_SECRET_MAX); | |
813472ce PR |
3955 | err = -EIO; |
3956 | goto reconnect; | |
b411b363 PR |
3957 | } |
3958 | ||
9f4fe9ad | 3959 | err = drbd_recv_all(peer_device->connection, p->verify_alg, data_size); |
813472ce PR |
3960 | if (err) |
3961 | goto reconnect; | |
b411b363 PR |
3962 | /* we expect NUL terminated string */ |
3963 | /* but just in case someone tries to be evil */ | |
0b0ba1ef | 3964 | D_ASSERT(device, p->verify_alg[data_size-1] == 0); |
b411b363 PR |
3965 | p->verify_alg[data_size-1] = 0; |
3966 | ||
3967 | } else /* apv >= 89 */ { | |
3968 | /* we still expect NUL terminated strings */ | |
3969 | /* but just in case someone tries to be evil */ | |
0b0ba1ef AG |
3970 | D_ASSERT(device, p->verify_alg[SHARED_SECRET_MAX-1] == 0); |
3971 | D_ASSERT(device, p->csums_alg[SHARED_SECRET_MAX-1] == 0); | |
b411b363 PR |
3972 | p->verify_alg[SHARED_SECRET_MAX-1] = 0; |
3973 | p->csums_alg[SHARED_SECRET_MAX-1] = 0; | |
3974 | } | |
3975 | ||
2ec91e0e | 3976 | if (strcmp(old_net_conf->verify_alg, p->verify_alg)) { |
b30ab791 | 3977 | if (device->state.conn == C_WF_REPORT_PARAMS) { |
d0180171 | 3978 | drbd_err(device, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n", |
2ec91e0e | 3979 | old_net_conf->verify_alg, p->verify_alg); |
b411b363 PR |
3980 | goto disconnect; |
3981 | } | |
b30ab791 | 3982 | verify_tfm = drbd_crypto_alloc_digest_safe(device, |
b411b363 PR |
3983 | p->verify_alg, "verify-alg"); |
3984 | if (IS_ERR(verify_tfm)) { | |
3985 | verify_tfm = NULL; | |
3986 | goto disconnect; | |
3987 | } | |
3988 | } | |
3989 | ||
2ec91e0e | 3990 | if (apv >= 89 && strcmp(old_net_conf->csums_alg, p->csums_alg)) { |
b30ab791 | 3991 | if (device->state.conn == C_WF_REPORT_PARAMS) { |
d0180171 | 3992 | drbd_err(device, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n", |
2ec91e0e | 3993 | old_net_conf->csums_alg, p->csums_alg); |
b411b363 PR |
3994 | goto disconnect; |
3995 | } | |
b30ab791 | 3996 | csums_tfm = drbd_crypto_alloc_digest_safe(device, |
b411b363 PR |
3997 | p->csums_alg, "csums-alg"); |
3998 | if (IS_ERR(csums_tfm)) { | |
3999 | csums_tfm = NULL; | |
4000 | goto disconnect; | |
4001 | } | |
4002 | } | |
4003 | ||
813472ce | 4004 | if (apv > 94 && new_disk_conf) { |
daeda1cc PR |
4005 | new_disk_conf->c_plan_ahead = be32_to_cpu(p->c_plan_ahead); |
4006 | new_disk_conf->c_delay_target = be32_to_cpu(p->c_delay_target); | |
4007 | new_disk_conf->c_fill_target = be32_to_cpu(p->c_fill_target); | |
4008 | new_disk_conf->c_max_rate = be32_to_cpu(p->c_max_rate); | |
778f271d | 4009 | |
daeda1cc | 4010 | fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ; |
b30ab791 | 4011 | if (fifo_size != device->rs_plan_s->size) { |
813472ce PR |
4012 | new_plan = fifo_alloc(fifo_size); |
4013 | if (!new_plan) { | |
d0180171 | 4014 | drbd_err(device, "kmalloc of fifo_buffer failed"); |
b30ab791 | 4015 | put_ldev(device); |
778f271d PR |
4016 | goto disconnect; |
4017 | } | |
4018 | } | |
8e26f9cc | 4019 | } |
b411b363 | 4020 | |
91fd4dad | 4021 | if (verify_tfm || csums_tfm) { |
2ec91e0e PR |
4022 | new_net_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL); |
4023 | if (!new_net_conf) { | |
d0180171 | 4024 | drbd_err(device, "Allocation of new net_conf failed\n"); |
91fd4dad PR |
4025 | goto disconnect; |
4026 | } | |
4027 | ||
2ec91e0e | 4028 | *new_net_conf = *old_net_conf; |
91fd4dad PR |
4029 | |
4030 | if (verify_tfm) { | |
2ec91e0e PR |
4031 | strcpy(new_net_conf->verify_alg, p->verify_alg); |
4032 | new_net_conf->verify_alg_len = strlen(p->verify_alg) + 1; | |
3d0e6375 | 4033 | crypto_free_shash(peer_device->connection->verify_tfm); |
9f4fe9ad | 4034 | peer_device->connection->verify_tfm = verify_tfm; |
d0180171 | 4035 | drbd_info(device, "using verify-alg: \"%s\"\n", p->verify_alg); |
91fd4dad PR |
4036 | } |
4037 | if (csums_tfm) { | |
2ec91e0e PR |
4038 | strcpy(new_net_conf->csums_alg, p->csums_alg); |
4039 | new_net_conf->csums_alg_len = strlen(p->csums_alg) + 1; | |
3d0e6375 | 4040 | crypto_free_shash(peer_device->connection->csums_tfm); |
9f4fe9ad | 4041 | peer_device->connection->csums_tfm = csums_tfm; |
d0180171 | 4042 | drbd_info(device, "using csums-alg: \"%s\"\n", p->csums_alg); |
91fd4dad | 4043 | } |
bde89a9e | 4044 | rcu_assign_pointer(connection->net_conf, new_net_conf); |
778f271d | 4045 | } |
b411b363 PR |
4046 | } |
4047 | ||
813472ce | 4048 | if (new_disk_conf) { |
b30ab791 AG |
4049 | rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf); |
4050 | put_ldev(device); | |
813472ce PR |
4051 | } |
4052 | ||
4053 | if (new_plan) { | |
b30ab791 AG |
4054 | old_plan = device->rs_plan_s; |
4055 | rcu_assign_pointer(device->rs_plan_s, new_plan); | |
b411b363 | 4056 | } |
daeda1cc | 4057 | |
0500813f | 4058 | mutex_unlock(&connection->resource->conf_update); |
daeda1cc PR |
4059 | synchronize_rcu(); |
4060 | if (new_net_conf) | |
4061 | kfree(old_net_conf); | |
4062 | kfree(old_disk_conf); | |
813472ce | 4063 | kfree(old_plan); |
daeda1cc | 4064 | |
82bc0194 | 4065 | return 0; |
b411b363 | 4066 | |
813472ce PR |
4067 | reconnect: |
4068 | if (new_disk_conf) { | |
b30ab791 | 4069 | put_ldev(device); |
813472ce PR |
4070 | kfree(new_disk_conf); |
4071 | } | |
0500813f | 4072 | mutex_unlock(&connection->resource->conf_update); |
813472ce PR |
4073 | return -EIO; |
4074 | ||
b411b363 | 4075 | disconnect: |
813472ce PR |
4076 | kfree(new_plan); |
4077 | if (new_disk_conf) { | |
b30ab791 | 4078 | put_ldev(device); |
813472ce PR |
4079 | kfree(new_disk_conf); |
4080 | } | |
0500813f | 4081 | mutex_unlock(&connection->resource->conf_update); |
b411b363 PR |
4082 | /* just for completeness: actually not needed, |
4083 | * as this is not reached if csums_tfm was ok. */ | |
3d0e6375 | 4084 | crypto_free_shash(csums_tfm); |
b411b363 | 4085 | /* but free the verify_tfm again, if csums_tfm did not work out */ |
3d0e6375 | 4086 | crypto_free_shash(verify_tfm); |
9f4fe9ad | 4087 | conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 4088 | return -EIO; |
b411b363 PR |
4089 | } |
4090 | ||
b411b363 | 4091 | /* warn if the arguments differ by more than 12.5% */ |
b30ab791 | 4092 | static void warn_if_differ_considerably(struct drbd_device *device, |
b411b363 PR |
4093 | const char *s, sector_t a, sector_t b) |
4094 | { | |
4095 | sector_t d; | |
4096 | if (a == 0 || b == 0) | |
4097 | return; | |
4098 | d = (a > b) ? (a - b) : (b - a); | |
4099 | if (d > (a>>3) || d > (b>>3)) | |
d0180171 | 4100 | drbd_warn(device, "Considerable difference in %s: %llus vs. %llus\n", s, |
b411b363 PR |
4101 | (unsigned long long)a, (unsigned long long)b); |
4102 | } | |
4103 | ||
bde89a9e | 4104 | static int receive_sizes(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 4105 | { |
9f4fe9ad | 4106 | struct drbd_peer_device *peer_device; |
b30ab791 | 4107 | struct drbd_device *device; |
e658983a | 4108 | struct p_sizes *p = pi->data; |
9104d31a | 4109 | struct o_qlim *o = (connection->agreed_features & DRBD_FF_WSAME) ? p->qlim : NULL; |
e96c9633 | 4110 | enum determine_dev_size dd = DS_UNCHANGED; |
6a8d68b1 | 4111 | sector_t p_size, p_usize, p_csize, my_usize; |
94c43a13 | 4112 | sector_t new_size, cur_size; |
b411b363 | 4113 | int ldsc = 0; /* local disk size changed */ |
e89b591c | 4114 | enum dds_flags ddsf; |
b411b363 | 4115 | |
9f4fe9ad AG |
4116 | peer_device = conn_peer_device(connection, pi->vnr); |
4117 | if (!peer_device) | |
bde89a9e | 4118 | return config_unknown_volume(connection, pi); |
9f4fe9ad | 4119 | device = peer_device->device; |
94c43a13 | 4120 | cur_size = drbd_get_capacity(device->this_bdev); |
4a76b161 | 4121 | |
b411b363 PR |
4122 | p_size = be64_to_cpu(p->d_size); |
4123 | p_usize = be64_to_cpu(p->u_size); | |
6a8d68b1 | 4124 | p_csize = be64_to_cpu(p->c_size); |
b411b363 | 4125 | |
b411b363 PR |
4126 | /* just store the peer's disk size for now. |
4127 | * we still need to figure out whether we accept that. */ | |
b30ab791 | 4128 | device->p_size = p_size; |
b411b363 | 4129 | |
b30ab791 | 4130 | if (get_ldev(device)) { |
daeda1cc | 4131 | rcu_read_lock(); |
b30ab791 | 4132 | my_usize = rcu_dereference(device->ldev->disk_conf)->disk_size; |
daeda1cc PR |
4133 | rcu_read_unlock(); |
4134 | ||
b30ab791 AG |
4135 | warn_if_differ_considerably(device, "lower level device sizes", |
4136 | p_size, drbd_get_max_capacity(device->ldev)); | |
4137 | warn_if_differ_considerably(device, "user requested size", | |
daeda1cc | 4138 | p_usize, my_usize); |
b411b363 PR |
4139 | |
4140 | /* if this is the first connect, or an otherwise expected | |
4141 | * param exchange, choose the minimum */ | |
b30ab791 | 4142 | if (device->state.conn == C_WF_REPORT_PARAMS) |
daeda1cc | 4143 | p_usize = min_not_zero(my_usize, p_usize); |
b411b363 | 4144 | |
ad6e8979 LE |
4145 | /* Never shrink a device with usable data during connect, |
4146 | * or "attach" on the peer. | |
4147 | * But allow online shrinking if we are connected. */ | |
60bac040 | 4148 | new_size = drbd_new_dev_size(device, device->ldev, p_usize, 0); |
60bac040 | 4149 | if (new_size < cur_size && |
b30ab791 | 4150 | device->state.disk >= D_OUTDATED && |
ad6e8979 | 4151 | (device->state.conn < C_CONNECTED || device->state.pdsk == D_DISKLESS)) { |
60bac040 LE |
4152 | drbd_err(device, "The peer's disk size is too small! (%llu < %llu sectors)\n", |
4153 | (unsigned long long)new_size, (unsigned long long)cur_size); | |
9f4fe9ad | 4154 | conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
b30ab791 | 4155 | put_ldev(device); |
82bc0194 | 4156 | return -EIO; |
b411b363 | 4157 | } |
daeda1cc PR |
4158 | |
4159 | if (my_usize != p_usize) { | |
4160 | struct disk_conf *old_disk_conf, *new_disk_conf = NULL; | |
4161 | ||
4162 | new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); | |
4163 | if (!new_disk_conf) { | |
d0180171 | 4164 | drbd_err(device, "Allocation of new disk_conf failed\n"); |
b30ab791 | 4165 | put_ldev(device); |
daeda1cc PR |
4166 | return -ENOMEM; |
4167 | } | |
4168 | ||
0500813f | 4169 | mutex_lock(&connection->resource->conf_update); |
b30ab791 | 4170 | old_disk_conf = device->ldev->disk_conf; |
daeda1cc PR |
4171 | *new_disk_conf = *old_disk_conf; |
4172 | new_disk_conf->disk_size = p_usize; | |
4173 | ||
b30ab791 | 4174 | rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf); |
0500813f | 4175 | mutex_unlock(&connection->resource->conf_update); |
daeda1cc PR |
4176 | synchronize_rcu(); |
4177 | kfree(old_disk_conf); | |
4178 | ||
ad6e8979 LE |
4179 | drbd_info(device, "Peer sets u_size to %lu sectors (old: %lu)\n", |
4180 | (unsigned long)p_usize, (unsigned long)my_usize); | |
b411b363 | 4181 | } |
daeda1cc | 4182 | |
b30ab791 | 4183 | put_ldev(device); |
b411b363 | 4184 | } |
b411b363 | 4185 | |
20c68fde | 4186 | device->peer_max_bio_size = be32_to_cpu(p->max_bio_size); |
dd4f699d | 4187 | /* Leave drbd_reconsider_queue_parameters() before drbd_determine_dev_size(). |
20c68fde | 4188 | In case we cleared the QUEUE_FLAG_DISCARD from our queue in |
dd4f699d | 4189 | drbd_reconsider_queue_parameters(), we can be sure that after |
20c68fde LE |
4190 | drbd_determine_dev_size() no REQ_DISCARDs are in the queue. */ |
4191 | ||
e89b591c | 4192 | ddsf = be16_to_cpu(p->dds_flags); |
b30ab791 | 4193 | if (get_ldev(device)) { |
9104d31a | 4194 | drbd_reconsider_queue_parameters(device, device->ldev, o); |
b30ab791 AG |
4195 | dd = drbd_determine_dev_size(device, ddsf, NULL); |
4196 | put_ldev(device); | |
e96c9633 | 4197 | if (dd == DS_ERROR) |
82bc0194 | 4198 | return -EIO; |
b30ab791 | 4199 | drbd_md_sync(device); |
b411b363 | 4200 | } else { |
6a8d68b1 LE |
4201 | /* |
4202 | * I am diskless, need to accept the peer's *current* size. | |
4203 | * I must NOT accept the peers backing disk size, | |
4204 | * it may have been larger than mine all along... | |
4205 | * | |
4206 | * At this point, the peer knows more about my disk, or at | |
4207 | * least about what we last agreed upon, than myself. | |
4208 | * So if his c_size is less than his d_size, the most likely | |
4209 | * reason is that *my* d_size was smaller last time we checked. | |
4210 | * | |
4211 | * However, if he sends a zero current size, | |
4212 | * take his (user-capped or) backing disk size anyways. | |
94c43a13 LE |
4213 | * |
4214 | * Unless of course he does not have a disk himself. | |
4215 | * In which case we ignore this completely. | |
6a8d68b1 | 4216 | */ |
94c43a13 | 4217 | sector_t new_size = p_csize ?: p_usize ?: p_size; |
9104d31a | 4218 | drbd_reconsider_queue_parameters(device, NULL, o); |
94c43a13 LE |
4219 | if (new_size == 0) { |
4220 | /* Ignore, peer does not know nothing. */ | |
4221 | } else if (new_size == cur_size) { | |
4222 | /* nothing to do */ | |
4223 | } else if (cur_size != 0 && p_size == 0) { | |
4224 | drbd_warn(device, "Ignored diskless peer device size (peer:%llu != me:%llu sectors)!\n", | |
4225 | (unsigned long long)new_size, (unsigned long long)cur_size); | |
4226 | } else if (new_size < cur_size && device->state.role == R_PRIMARY) { | |
4227 | drbd_err(device, "The peer's device size is too small! (%llu < %llu sectors); demote me first!\n", | |
4228 | (unsigned long long)new_size, (unsigned long long)cur_size); | |
4229 | conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); | |
4230 | return -EIO; | |
4231 | } else { | |
4232 | /* I believe the peer, if | |
4233 | * - I don't have a current size myself | |
4234 | * - we agree on the size anyways | |
4235 | * - I do have a current size, am Secondary, | |
4236 | * and he has the only disk | |
4237 | * - I do have a current size, am Primary, | |
4238 | * and he has the only disk, | |
4239 | * which is larger than my current size | |
4240 | */ | |
4241 | drbd_set_my_capacity(device, new_size); | |
4242 | } | |
b411b363 PR |
4243 | } |
4244 | ||
b30ab791 AG |
4245 | if (get_ldev(device)) { |
4246 | if (device->ldev->known_size != drbd_get_capacity(device->ldev->backing_bdev)) { | |
4247 | device->ldev->known_size = drbd_get_capacity(device->ldev->backing_bdev); | |
b411b363 PR |
4248 | ldsc = 1; |
4249 | } | |
4250 | ||
b30ab791 | 4251 | put_ldev(device); |
b411b363 PR |
4252 | } |
4253 | ||
b30ab791 | 4254 | if (device->state.conn > C_WF_REPORT_PARAMS) { |
b411b363 | 4255 | if (be64_to_cpu(p->c_size) != |
b30ab791 | 4256 | drbd_get_capacity(device->this_bdev) || ldsc) { |
b411b363 PR |
4257 | /* we have different sizes, probably peer |
4258 | * needs to know my new size... */ | |
69a22773 | 4259 | drbd_send_sizes(peer_device, 0, ddsf); |
b411b363 | 4260 | } |
b30ab791 AG |
4261 | if (test_and_clear_bit(RESIZE_PENDING, &device->flags) || |
4262 | (dd == DS_GREW && device->state.conn == C_CONNECTED)) { | |
4263 | if (device->state.pdsk >= D_INCONSISTENT && | |
4264 | device->state.disk >= D_INCONSISTENT) { | |
e89b591c | 4265 | if (ddsf & DDSF_NO_RESYNC) |
d0180171 | 4266 | drbd_info(device, "Resync of new storage suppressed with --assume-clean\n"); |
e89b591c | 4267 | else |
b30ab791 | 4268 | resync_after_online_grow(device); |
e89b591c | 4269 | } else |
b30ab791 | 4270 | set_bit(RESYNC_AFTER_NEG, &device->flags); |
b411b363 PR |
4271 | } |
4272 | } | |
4273 | ||
82bc0194 | 4274 | return 0; |
b411b363 PR |
4275 | } |
4276 | ||
bde89a9e | 4277 | static int receive_uuids(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 4278 | { |
9f4fe9ad | 4279 | struct drbd_peer_device *peer_device; |
b30ab791 | 4280 | struct drbd_device *device; |
e658983a | 4281 | struct p_uuids *p = pi->data; |
b411b363 | 4282 | u64 *p_uuid; |
62b0da3a | 4283 | int i, updated_uuids = 0; |
b411b363 | 4284 | |
9f4fe9ad AG |
4285 | peer_device = conn_peer_device(connection, pi->vnr); |
4286 | if (!peer_device) | |
bde89a9e | 4287 | return config_unknown_volume(connection, pi); |
9f4fe9ad | 4288 | device = peer_device->device; |
4a76b161 | 4289 | |
365cf663 | 4290 | p_uuid = kmalloc_array(UI_EXTENDED_SIZE, sizeof(*p_uuid), GFP_NOIO); |
063eacf8 | 4291 | if (!p_uuid) { |
d0180171 | 4292 | drbd_err(device, "kmalloc of p_uuid failed\n"); |
063eacf8 JW |
4293 | return false; |
4294 | } | |
b411b363 PR |
4295 | |
4296 | for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) | |
4297 | p_uuid[i] = be64_to_cpu(p->uuid[i]); | |
4298 | ||
b30ab791 AG |
4299 | kfree(device->p_uuid); |
4300 | device->p_uuid = p_uuid; | |
b411b363 | 4301 | |
b17b5960 | 4302 | if ((device->state.conn < C_CONNECTED || device->state.pdsk == D_DISKLESS) && |
b30ab791 AG |
4303 | device->state.disk < D_INCONSISTENT && |
4304 | device->state.role == R_PRIMARY && | |
4305 | (device->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { | |
d0180171 | 4306 | drbd_err(device, "Can only connect to data with current UUID=%016llX\n", |
b30ab791 | 4307 | (unsigned long long)device->ed_uuid); |
9f4fe9ad | 4308 | conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 4309 | return -EIO; |
b411b363 PR |
4310 | } |
4311 | ||
b30ab791 | 4312 | if (get_ldev(device)) { |
b411b363 | 4313 | int skip_initial_sync = |
b30ab791 | 4314 | device->state.conn == C_CONNECTED && |
9f4fe9ad | 4315 | peer_device->connection->agreed_pro_version >= 90 && |
b30ab791 | 4316 | device->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && |
b411b363 PR |
4317 | (p_uuid[UI_FLAGS] & 8); |
4318 | if (skip_initial_sync) { | |
d0180171 | 4319 | drbd_info(device, "Accepted new current UUID, preparing to skip initial sync\n"); |
b30ab791 | 4320 | drbd_bitmap_io(device, &drbd_bmio_clear_n_write, |
20ceb2b2 LE |
4321 | "clear_n_write from receive_uuids", |
4322 | BM_LOCKED_TEST_ALLOWED); | |
b30ab791 AG |
4323 | _drbd_uuid_set(device, UI_CURRENT, p_uuid[UI_CURRENT]); |
4324 | _drbd_uuid_set(device, UI_BITMAP, 0); | |
4325 | _drbd_set_state(_NS2(device, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), | |
b411b363 | 4326 | CS_VERBOSE, NULL); |
b30ab791 | 4327 | drbd_md_sync(device); |
62b0da3a | 4328 | updated_uuids = 1; |
b411b363 | 4329 | } |
b30ab791 AG |
4330 | put_ldev(device); |
4331 | } else if (device->state.disk < D_INCONSISTENT && | |
4332 | device->state.role == R_PRIMARY) { | |
18a50fa2 PR |
4333 | /* I am a diskless primary, the peer just created a new current UUID |
4334 | for me. */ | |
b30ab791 | 4335 | updated_uuids = drbd_set_ed_uuid(device, p_uuid[UI_CURRENT]); |
b411b363 PR |
4336 | } |
4337 | ||
4338 | /* Before we test for the disk state, we should wait until an eventually | |
4339 | ongoing cluster wide state change is finished. That is important if | |
4340 | we are primary and are detaching from our disk. We need to see the | |
4341 | new disk state... */ | |
b30ab791 AG |
4342 | mutex_lock(device->state_mutex); |
4343 | mutex_unlock(device->state_mutex); | |
4344 | if (device->state.conn >= C_CONNECTED && device->state.disk < D_INCONSISTENT) | |
4345 | updated_uuids |= drbd_set_ed_uuid(device, p_uuid[UI_CURRENT]); | |
62b0da3a LE |
4346 | |
4347 | if (updated_uuids) | |
b30ab791 | 4348 | drbd_print_uuids(device, "receiver updated UUIDs to"); |
b411b363 | 4349 | |
82bc0194 | 4350 | return 0; |
b411b363 PR |
4351 | } |
4352 | ||
4353 | /** | |
4354 | * convert_state() - Converts the peer's view of the cluster state to our point of view | |
4355 | * @ps: The state as seen by the peer. | |
4356 | */ | |
4357 | static union drbd_state convert_state(union drbd_state ps) | |
4358 | { | |
4359 | union drbd_state ms; | |
4360 | ||
4361 | static enum drbd_conns c_tab[] = { | |
369bea63 | 4362 | [C_WF_REPORT_PARAMS] = C_WF_REPORT_PARAMS, |
b411b363 PR |
4363 | [C_CONNECTED] = C_CONNECTED, |
4364 | ||
4365 | [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, | |
4366 | [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, | |
4367 | [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ | |
4368 | [C_VERIFY_S] = C_VERIFY_T, | |
4369 | [C_MASK] = C_MASK, | |
4370 | }; | |
4371 | ||
4372 | ms.i = ps.i; | |
4373 | ||
4374 | ms.conn = c_tab[ps.conn]; | |
4375 | ms.peer = ps.role; | |
4376 | ms.role = ps.peer; | |
4377 | ms.pdsk = ps.disk; | |
4378 | ms.disk = ps.pdsk; | |
4379 | ms.peer_isp = (ps.aftr_isp | ps.user_isp); | |
4380 | ||
4381 | return ms; | |
4382 | } | |
4383 | ||
bde89a9e | 4384 | static int receive_req_state(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 4385 | { |
9f4fe9ad | 4386 | struct drbd_peer_device *peer_device; |
b30ab791 | 4387 | struct drbd_device *device; |
e658983a | 4388 | struct p_req_state *p = pi->data; |
b411b363 | 4389 | union drbd_state mask, val; |
bf885f8a | 4390 | enum drbd_state_rv rv; |
b411b363 | 4391 | |
9f4fe9ad AG |
4392 | peer_device = conn_peer_device(connection, pi->vnr); |
4393 | if (!peer_device) | |
4a76b161 | 4394 | return -EIO; |
9f4fe9ad | 4395 | device = peer_device->device; |
4a76b161 | 4396 | |
b411b363 PR |
4397 | mask.i = be32_to_cpu(p->mask); |
4398 | val.i = be32_to_cpu(p->val); | |
4399 | ||
9f4fe9ad | 4400 | if (test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags) && |
b30ab791 | 4401 | mutex_is_locked(device->state_mutex)) { |
69a22773 | 4402 | drbd_send_sr_reply(peer_device, SS_CONCURRENT_ST_CHG); |
82bc0194 | 4403 | return 0; |
b411b363 PR |
4404 | } |
4405 | ||
4406 | mask = convert_state(mask); | |
4407 | val = convert_state(val); | |
4408 | ||
b30ab791 | 4409 | rv = drbd_change_state(device, CS_VERBOSE, mask, val); |
69a22773 | 4410 | drbd_send_sr_reply(peer_device, rv); |
b411b363 | 4411 | |
b30ab791 | 4412 | drbd_md_sync(device); |
b411b363 | 4413 | |
82bc0194 | 4414 | return 0; |
b411b363 PR |
4415 | } |
4416 | ||
bde89a9e | 4417 | static int receive_req_conn_state(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 4418 | { |
e658983a | 4419 | struct p_req_state *p = pi->data; |
b411b363 | 4420 | union drbd_state mask, val; |
bf885f8a | 4421 | enum drbd_state_rv rv; |
b411b363 | 4422 | |
b411b363 PR |
4423 | mask.i = be32_to_cpu(p->mask); |
4424 | val.i = be32_to_cpu(p->val); | |
4425 | ||
bde89a9e AG |
4426 | if (test_bit(RESOLVE_CONFLICTS, &connection->flags) && |
4427 | mutex_is_locked(&connection->cstate_mutex)) { | |
4428 | conn_send_sr_reply(connection, SS_CONCURRENT_ST_CHG); | |
82bc0194 | 4429 | return 0; |
b411b363 PR |
4430 | } |
4431 | ||
4432 | mask = convert_state(mask); | |
4433 | val = convert_state(val); | |
4434 | ||
bde89a9e AG |
4435 | rv = conn_request_state(connection, mask, val, CS_VERBOSE | CS_LOCAL_ONLY | CS_IGN_OUTD_FAIL); |
4436 | conn_send_sr_reply(connection, rv); | |
b411b363 | 4437 | |
82bc0194 | 4438 | return 0; |
b411b363 PR |
4439 | } |
4440 | ||
bde89a9e | 4441 | static int receive_state(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 4442 | { |
9f4fe9ad | 4443 | struct drbd_peer_device *peer_device; |
b30ab791 | 4444 | struct drbd_device *device; |
e658983a | 4445 | struct p_state *p = pi->data; |
4ac4aada | 4446 | union drbd_state os, ns, peer_state; |
b411b363 | 4447 | enum drbd_disk_state real_peer_disk; |
65d922c3 | 4448 | enum chg_state_flags cs_flags; |
b411b363 PR |
4449 | int rv; |
4450 | ||
9f4fe9ad AG |
4451 | peer_device = conn_peer_device(connection, pi->vnr); |
4452 | if (!peer_device) | |
bde89a9e | 4453 | return config_unknown_volume(connection, pi); |
9f4fe9ad | 4454 | device = peer_device->device; |
4a76b161 | 4455 | |
b411b363 PR |
4456 | peer_state.i = be32_to_cpu(p->state); |
4457 | ||
4458 | real_peer_disk = peer_state.disk; | |
4459 | if (peer_state.disk == D_NEGOTIATING) { | |
b30ab791 | 4460 | real_peer_disk = device->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; |
d0180171 | 4461 | drbd_info(device, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk)); |
b411b363 PR |
4462 | } |
4463 | ||
0500813f | 4464 | spin_lock_irq(&device->resource->req_lock); |
b411b363 | 4465 | retry: |
b30ab791 | 4466 | os = ns = drbd_read_state(device); |
0500813f | 4467 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 | 4468 | |
668700b4 | 4469 | /* If some other part of the code (ack_receiver thread, timeout) |
545752d5 LE |
4470 | * already decided to close the connection again, |
4471 | * we must not "re-establish" it here. */ | |
4472 | if (os.conn <= C_TEAR_DOWN) | |
58ffa580 | 4473 | return -ECONNRESET; |
545752d5 | 4474 | |
40424e4a LE |
4475 | /* If this is the "end of sync" confirmation, usually the peer disk |
4476 | * transitions from D_INCONSISTENT to D_UP_TO_DATE. For empty (0 bits | |
4477 | * set) resync started in PausedSyncT, or if the timing of pause-/ | |
4478 | * unpause-sync events has been "just right", the peer disk may | |
4479 | * transition from D_CONSISTENT to D_UP_TO_DATE as well. | |
4480 | */ | |
4481 | if ((os.pdsk == D_INCONSISTENT || os.pdsk == D_CONSISTENT) && | |
4482 | real_peer_disk == D_UP_TO_DATE && | |
e9ef7bb6 LE |
4483 | os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { |
4484 | /* If we are (becoming) SyncSource, but peer is still in sync | |
4485 | * preparation, ignore its uptodate-ness to avoid flapping, it | |
4486 | * will change to inconsistent once the peer reaches active | |
4487 | * syncing states. | |
4488 | * It may have changed syncer-paused flags, however, so we | |
4489 | * cannot ignore this completely. */ | |
4490 | if (peer_state.conn > C_CONNECTED && | |
4491 | peer_state.conn < C_SYNC_SOURCE) | |
4492 | real_peer_disk = D_INCONSISTENT; | |
4493 | ||
4494 | /* if peer_state changes to connected at the same time, | |
4495 | * it explicitly notifies us that it finished resync. | |
4496 | * Maybe we should finish it up, too? */ | |
4497 | else if (os.conn >= C_SYNC_SOURCE && | |
4498 | peer_state.conn == C_CONNECTED) { | |
b30ab791 AG |
4499 | if (drbd_bm_total_weight(device) <= device->rs_failed) |
4500 | drbd_resync_finished(device); | |
82bc0194 | 4501 | return 0; |
e9ef7bb6 LE |
4502 | } |
4503 | } | |
4504 | ||
02b91b55 LE |
4505 | /* explicit verify finished notification, stop sector reached. */ |
4506 | if (os.conn == C_VERIFY_T && os.disk == D_UP_TO_DATE && | |
4507 | peer_state.conn == C_CONNECTED && real_peer_disk == D_UP_TO_DATE) { | |
b30ab791 AG |
4508 | ov_out_of_sync_print(device); |
4509 | drbd_resync_finished(device); | |
58ffa580 | 4510 | return 0; |
02b91b55 LE |
4511 | } |
4512 | ||
e9ef7bb6 LE |
4513 | /* peer says his disk is inconsistent, while we think it is uptodate, |
4514 | * and this happens while the peer still thinks we have a sync going on, | |
4515 | * but we think we are already done with the sync. | |
4516 | * We ignore this to avoid flapping pdsk. | |
4517 | * This should not happen, if the peer is a recent version of drbd. */ | |
4518 | if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && | |
4519 | os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) | |
4520 | real_peer_disk = D_UP_TO_DATE; | |
4521 | ||
4ac4aada LE |
4522 | if (ns.conn == C_WF_REPORT_PARAMS) |
4523 | ns.conn = C_CONNECTED; | |
b411b363 | 4524 | |
67531718 PR |
4525 | if (peer_state.conn == C_AHEAD) |
4526 | ns.conn = C_BEHIND; | |
4527 | ||
fe43ed97 LE |
4528 | /* TODO: |
4529 | * if (primary and diskless and peer uuid != effective uuid) | |
4530 | * abort attach on peer; | |
4531 | * | |
4532 | * If this node does not have good data, was already connected, but | |
4533 | * the peer did a late attach only now, trying to "negotiate" with me, | |
4534 | * AND I am currently Primary, possibly frozen, with some specific | |
4535 | * "effective" uuid, this should never be reached, really, because | |
4536 | * we first send the uuids, then the current state. | |
4537 | * | |
4538 | * In this scenario, we already dropped the connection hard | |
4539 | * when we received the unsuitable uuids (receive_uuids(). | |
4540 | * | |
4541 | * Should we want to change this, that is: not drop the connection in | |
4542 | * receive_uuids() already, then we would need to add a branch here | |
4543 | * that aborts the attach of "unsuitable uuids" on the peer in case | |
4544 | * this node is currently Diskless Primary. | |
4545 | */ | |
4546 | ||
b30ab791 AG |
4547 | if (device->p_uuid && peer_state.disk >= D_NEGOTIATING && |
4548 | get_ldev_if_state(device, D_NEGOTIATING)) { | |
b411b363 PR |
4549 | int cr; /* consider resync */ |
4550 | ||
4551 | /* if we established a new connection */ | |
4ac4aada | 4552 | cr = (os.conn < C_CONNECTED); |
b411b363 PR |
4553 | /* if we had an established connection |
4554 | * and one of the nodes newly attaches a disk */ | |
4ac4aada | 4555 | cr |= (os.conn == C_CONNECTED && |
b411b363 | 4556 | (peer_state.disk == D_NEGOTIATING || |
4ac4aada | 4557 | os.disk == D_NEGOTIATING)); |
b411b363 | 4558 | /* if we have both been inconsistent, and the peer has been |
a2823ea9 | 4559 | * forced to be UpToDate with --force */ |
b30ab791 | 4560 | cr |= test_bit(CONSIDER_RESYNC, &device->flags); |
b411b363 PR |
4561 | /* if we had been plain connected, and the admin requested to |
4562 | * start a sync by "invalidate" or "invalidate-remote" */ | |
4ac4aada | 4563 | cr |= (os.conn == C_CONNECTED && |
b411b363 PR |
4564 | (peer_state.conn >= C_STARTING_SYNC_S && |
4565 | peer_state.conn <= C_WF_BITMAP_T)); | |
4566 | ||
4567 | if (cr) | |
69a22773 | 4568 | ns.conn = drbd_sync_handshake(peer_device, peer_state.role, real_peer_disk); |
b411b363 | 4569 | |
b30ab791 | 4570 | put_ldev(device); |
4ac4aada LE |
4571 | if (ns.conn == C_MASK) { |
4572 | ns.conn = C_CONNECTED; | |
b30ab791 AG |
4573 | if (device->state.disk == D_NEGOTIATING) { |
4574 | drbd_force_state(device, NS(disk, D_FAILED)); | |
b411b363 | 4575 | } else if (peer_state.disk == D_NEGOTIATING) { |
d0180171 | 4576 | drbd_err(device, "Disk attach process on the peer node was aborted.\n"); |
b411b363 | 4577 | peer_state.disk = D_DISKLESS; |
580b9767 | 4578 | real_peer_disk = D_DISKLESS; |
b411b363 | 4579 | } else { |
9f4fe9ad | 4580 | if (test_and_clear_bit(CONN_DRY_RUN, &peer_device->connection->flags)) |
82bc0194 | 4581 | return -EIO; |
0b0ba1ef | 4582 | D_ASSERT(device, os.conn == C_WF_REPORT_PARAMS); |
9f4fe9ad | 4583 | conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 4584 | return -EIO; |
b411b363 PR |
4585 | } |
4586 | } | |
4587 | } | |
4588 | ||
0500813f | 4589 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 | 4590 | if (os.i != drbd_read_state(device).i) |
b411b363 | 4591 | goto retry; |
b30ab791 | 4592 | clear_bit(CONSIDER_RESYNC, &device->flags); |
b411b363 PR |
4593 | ns.peer = peer_state.role; |
4594 | ns.pdsk = real_peer_disk; | |
4595 | ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); | |
4ac4aada | 4596 | if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) |
b30ab791 | 4597 | ns.disk = device->new_state_tmp.disk; |
4ac4aada | 4598 | cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); |
b30ab791 AG |
4599 | if (ns.pdsk == D_CONSISTENT && drbd_suspended(device) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && |
4600 | test_bit(NEW_CUR_UUID, &device->flags)) { | |
8554df1c | 4601 | /* Do not allow tl_restart(RESEND) for a rebooted peer. We can only allow this |
481c6f50 | 4602 | for temporal network outages! */ |
0500813f | 4603 | spin_unlock_irq(&device->resource->req_lock); |
d0180171 | 4604 | drbd_err(device, "Aborting Connect, can not thaw IO with an only Consistent peer\n"); |
9f4fe9ad | 4605 | tl_clear(peer_device->connection); |
b30ab791 AG |
4606 | drbd_uuid_new_current(device); |
4607 | clear_bit(NEW_CUR_UUID, &device->flags); | |
9f4fe9ad | 4608 | conn_request_state(peer_device->connection, NS2(conn, C_PROTOCOL_ERROR, susp, 0), CS_HARD); |
82bc0194 | 4609 | return -EIO; |
481c6f50 | 4610 | } |
b30ab791 AG |
4611 | rv = _drbd_set_state(device, ns, cs_flags, NULL); |
4612 | ns = drbd_read_state(device); | |
0500813f | 4613 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 PR |
4614 | |
4615 | if (rv < SS_SUCCESS) { | |
9f4fe9ad | 4616 | conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD); |
82bc0194 | 4617 | return -EIO; |
b411b363 PR |
4618 | } |
4619 | ||
4ac4aada LE |
4620 | if (os.conn > C_WF_REPORT_PARAMS) { |
4621 | if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED && | |
b411b363 PR |
4622 | peer_state.disk != D_NEGOTIATING ) { |
4623 | /* we want resync, peer has not yet decided to sync... */ | |
4624 | /* Nowadays only used when forcing a node into primary role and | |
4625 | setting its disk to UpToDate with that */ | |
69a22773 AG |
4626 | drbd_send_uuids(peer_device); |
4627 | drbd_send_current_state(peer_device); | |
b411b363 PR |
4628 | } |
4629 | } | |
4630 | ||
b30ab791 | 4631 | clear_bit(DISCARD_MY_DATA, &device->flags); |
b411b363 | 4632 | |
b30ab791 | 4633 | drbd_md_sync(device); /* update connected indicator, la_size_sect, ... */ |
b411b363 | 4634 | |
82bc0194 | 4635 | return 0; |
b411b363 PR |
4636 | } |
4637 | ||
bde89a9e | 4638 | static int receive_sync_uuid(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 4639 | { |
9f4fe9ad | 4640 | struct drbd_peer_device *peer_device; |
b30ab791 | 4641 | struct drbd_device *device; |
e658983a | 4642 | struct p_rs_uuid *p = pi->data; |
4a76b161 | 4643 | |
9f4fe9ad AG |
4644 | peer_device = conn_peer_device(connection, pi->vnr); |
4645 | if (!peer_device) | |
4a76b161 | 4646 | return -EIO; |
9f4fe9ad | 4647 | device = peer_device->device; |
b411b363 | 4648 | |
b30ab791 AG |
4649 | wait_event(device->misc_wait, |
4650 | device->state.conn == C_WF_SYNC_UUID || | |
4651 | device->state.conn == C_BEHIND || | |
4652 | device->state.conn < C_CONNECTED || | |
4653 | device->state.disk < D_NEGOTIATING); | |
b411b363 | 4654 | |
0b0ba1ef | 4655 | /* D_ASSERT(device, device->state.conn == C_WF_SYNC_UUID ); */ |
b411b363 | 4656 | |
b411b363 PR |
4657 | /* Here the _drbd_uuid_ functions are right, current should |
4658 | _not_ be rotated into the history */ | |
b30ab791 AG |
4659 | if (get_ldev_if_state(device, D_NEGOTIATING)) { |
4660 | _drbd_uuid_set(device, UI_CURRENT, be64_to_cpu(p->uuid)); | |
4661 | _drbd_uuid_set(device, UI_BITMAP, 0UL); | |
b411b363 | 4662 | |
b30ab791 AG |
4663 | drbd_print_uuids(device, "updated sync uuid"); |
4664 | drbd_start_resync(device, C_SYNC_TARGET); | |
b411b363 | 4665 | |
b30ab791 | 4666 | put_ldev(device); |
b411b363 | 4667 | } else |
d0180171 | 4668 | drbd_err(device, "Ignoring SyncUUID packet!\n"); |
b411b363 | 4669 | |
82bc0194 | 4670 | return 0; |
b411b363 PR |
4671 | } |
4672 | ||
2c46407d AG |
4673 | /** |
4674 | * receive_bitmap_plain | |
4675 | * | |
4676 | * Return 0 when done, 1 when another iteration is needed, and a negative error | |
4677 | * code upon failure. | |
4678 | */ | |
4679 | static int | |
69a22773 | 4680 | receive_bitmap_plain(struct drbd_peer_device *peer_device, unsigned int size, |
e658983a | 4681 | unsigned long *p, struct bm_xfer_ctx *c) |
b411b363 | 4682 | { |
50d0b1ad | 4683 | unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - |
69a22773 | 4684 | drbd_header_size(peer_device->connection); |
e658983a | 4685 | unsigned int num_words = min_t(size_t, data_size / sizeof(*p), |
50d0b1ad | 4686 | c->bm_words - c->word_offset); |
e658983a | 4687 | unsigned int want = num_words * sizeof(*p); |
2c46407d | 4688 | int err; |
b411b363 | 4689 | |
50d0b1ad | 4690 | if (want != size) { |
69a22773 | 4691 | drbd_err(peer_device, "%s:want (%u) != size (%u)\n", __func__, want, size); |
2c46407d | 4692 | return -EIO; |
b411b363 PR |
4693 | } |
4694 | if (want == 0) | |
2c46407d | 4695 | return 0; |
69a22773 | 4696 | err = drbd_recv_all(peer_device->connection, p, want); |
82bc0194 | 4697 | if (err) |
2c46407d | 4698 | return err; |
b411b363 | 4699 | |
69a22773 | 4700 | drbd_bm_merge_lel(peer_device->device, c->word_offset, num_words, p); |
b411b363 PR |
4701 | |
4702 | c->word_offset += num_words; | |
4703 | c->bit_offset = c->word_offset * BITS_PER_LONG; | |
4704 | if (c->bit_offset > c->bm_bits) | |
4705 | c->bit_offset = c->bm_bits; | |
4706 | ||
2c46407d | 4707 | return 1; |
b411b363 PR |
4708 | } |
4709 | ||
a02d1240 AG |
4710 | static enum drbd_bitmap_code dcbp_get_code(struct p_compressed_bm *p) |
4711 | { | |
4712 | return (enum drbd_bitmap_code)(p->encoding & 0x0f); | |
4713 | } | |
4714 | ||
4715 | static int dcbp_get_start(struct p_compressed_bm *p) | |
4716 | { | |
4717 | return (p->encoding & 0x80) != 0; | |
4718 | } | |
4719 | ||
4720 | static int dcbp_get_pad_bits(struct p_compressed_bm *p) | |
4721 | { | |
4722 | return (p->encoding >> 4) & 0x7; | |
4723 | } | |
4724 | ||
2c46407d AG |
4725 | /** |
4726 | * recv_bm_rle_bits | |
4727 | * | |
4728 | * Return 0 when done, 1 when another iteration is needed, and a negative error | |
4729 | * code upon failure. | |
4730 | */ | |
4731 | static int | |
69a22773 | 4732 | recv_bm_rle_bits(struct drbd_peer_device *peer_device, |
b411b363 | 4733 | struct p_compressed_bm *p, |
c6d25cfe PR |
4734 | struct bm_xfer_ctx *c, |
4735 | unsigned int len) | |
b411b363 PR |
4736 | { |
4737 | struct bitstream bs; | |
4738 | u64 look_ahead; | |
4739 | u64 rl; | |
4740 | u64 tmp; | |
4741 | unsigned long s = c->bit_offset; | |
4742 | unsigned long e; | |
a02d1240 | 4743 | int toggle = dcbp_get_start(p); |
b411b363 PR |
4744 | int have; |
4745 | int bits; | |
4746 | ||
a02d1240 | 4747 | bitstream_init(&bs, p->code, len, dcbp_get_pad_bits(p)); |
b411b363 PR |
4748 | |
4749 | bits = bitstream_get_bits(&bs, &look_ahead, 64); | |
4750 | if (bits < 0) | |
2c46407d | 4751 | return -EIO; |
b411b363 PR |
4752 | |
4753 | for (have = bits; have > 0; s += rl, toggle = !toggle) { | |
4754 | bits = vli_decode_bits(&rl, look_ahead); | |
4755 | if (bits <= 0) | |
2c46407d | 4756 | return -EIO; |
b411b363 PR |
4757 | |
4758 | if (toggle) { | |
4759 | e = s + rl -1; | |
4760 | if (e >= c->bm_bits) { | |
69a22773 | 4761 | drbd_err(peer_device, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); |
2c46407d | 4762 | return -EIO; |
b411b363 | 4763 | } |
69a22773 | 4764 | _drbd_bm_set_bits(peer_device->device, s, e); |
b411b363 PR |
4765 | } |
4766 | ||
4767 | if (have < bits) { | |
69a22773 | 4768 | drbd_err(peer_device, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n", |
b411b363 PR |
4769 | have, bits, look_ahead, |
4770 | (unsigned int)(bs.cur.b - p->code), | |
4771 | (unsigned int)bs.buf_len); | |
2c46407d | 4772 | return -EIO; |
b411b363 | 4773 | } |
d2da5b0c LE |
4774 | /* if we consumed all 64 bits, assign 0; >> 64 is "undefined"; */ |
4775 | if (likely(bits < 64)) | |
4776 | look_ahead >>= bits; | |
4777 | else | |
4778 | look_ahead = 0; | |
b411b363 PR |
4779 | have -= bits; |
4780 | ||
4781 | bits = bitstream_get_bits(&bs, &tmp, 64 - have); | |
4782 | if (bits < 0) | |
2c46407d | 4783 | return -EIO; |
b411b363 PR |
4784 | look_ahead |= tmp << have; |
4785 | have += bits; | |
4786 | } | |
4787 | ||
4788 | c->bit_offset = s; | |
4789 | bm_xfer_ctx_bit_to_word_offset(c); | |
4790 | ||
2c46407d | 4791 | return (s != c->bm_bits); |
b411b363 PR |
4792 | } |
4793 | ||
2c46407d AG |
4794 | /** |
4795 | * decode_bitmap_c | |
4796 | * | |
4797 | * Return 0 when done, 1 when another iteration is needed, and a negative error | |
4798 | * code upon failure. | |
4799 | */ | |
4800 | static int | |
69a22773 | 4801 | decode_bitmap_c(struct drbd_peer_device *peer_device, |
b411b363 | 4802 | struct p_compressed_bm *p, |
c6d25cfe PR |
4803 | struct bm_xfer_ctx *c, |
4804 | unsigned int len) | |
b411b363 | 4805 | { |
a02d1240 | 4806 | if (dcbp_get_code(p) == RLE_VLI_Bits) |
69a22773 | 4807 | return recv_bm_rle_bits(peer_device, p, c, len - sizeof(*p)); |
b411b363 PR |
4808 | |
4809 | /* other variants had been implemented for evaluation, | |
4810 | * but have been dropped as this one turned out to be "best" | |
4811 | * during all our tests. */ | |
4812 | ||
69a22773 AG |
4813 | drbd_err(peer_device, "receive_bitmap_c: unknown encoding %u\n", p->encoding); |
4814 | conn_request_state(peer_device->connection, NS(conn, C_PROTOCOL_ERROR), CS_HARD); | |
2c46407d | 4815 | return -EIO; |
b411b363 PR |
4816 | } |
4817 | ||
b30ab791 | 4818 | void INFO_bm_xfer_stats(struct drbd_device *device, |
b411b363 PR |
4819 | const char *direction, struct bm_xfer_ctx *c) |
4820 | { | |
4821 | /* what would it take to transfer it "plaintext" */ | |
a6b32bc3 | 4822 | unsigned int header_size = drbd_header_size(first_peer_device(device)->connection); |
50d0b1ad AG |
4823 | unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - header_size; |
4824 | unsigned int plain = | |
4825 | header_size * (DIV_ROUND_UP(c->bm_words, data_size) + 1) + | |
4826 | c->bm_words * sizeof(unsigned long); | |
4827 | unsigned int total = c->bytes[0] + c->bytes[1]; | |
4828 | unsigned int r; | |
b411b363 PR |
4829 | |
4830 | /* total can not be zero. but just in case: */ | |
4831 | if (total == 0) | |
4832 | return; | |
4833 | ||
4834 | /* don't report if not compressed */ | |
4835 | if (total >= plain) | |
4836 | return; | |
4837 | ||
4838 | /* total < plain. check for overflow, still */ | |
4839 | r = (total > UINT_MAX/1000) ? (total / (plain/1000)) | |
4840 | : (1000 * total / plain); | |
4841 | ||
4842 | if (r > 1000) | |
4843 | r = 1000; | |
4844 | ||
4845 | r = 1000 - r; | |
d0180171 | 4846 | drbd_info(device, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " |
b411b363 PR |
4847 | "total %u; compression: %u.%u%%\n", |
4848 | direction, | |
4849 | c->bytes[1], c->packets[1], | |
4850 | c->bytes[0], c->packets[0], | |
4851 | total, r/10, r % 10); | |
4852 | } | |
4853 | ||
4854 | /* Since we are processing the bitfield from lower addresses to higher, | |
4855 | it does not matter if the process it in 32 bit chunks or 64 bit | |
4856 | chunks as long as it is little endian. (Understand it as byte stream, | |
4857 | beginning with the lowest byte...) If we would use big endian | |
4858 | we would need to process it from the highest address to the lowest, | |
4859 | in order to be agnostic to the 32 vs 64 bits issue. | |
4860 | ||
4861 | returns 0 on failure, 1 if we successfully received it. */ | |
bde89a9e | 4862 | static int receive_bitmap(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 4863 | { |
9f4fe9ad | 4864 | struct drbd_peer_device *peer_device; |
b30ab791 | 4865 | struct drbd_device *device; |
b411b363 | 4866 | struct bm_xfer_ctx c; |
2c46407d | 4867 | int err; |
4a76b161 | 4868 | |
9f4fe9ad AG |
4869 | peer_device = conn_peer_device(connection, pi->vnr); |
4870 | if (!peer_device) | |
4a76b161 | 4871 | return -EIO; |
9f4fe9ad | 4872 | device = peer_device->device; |
b411b363 | 4873 | |
b30ab791 | 4874 | drbd_bm_lock(device, "receive bitmap", BM_LOCKED_SET_ALLOWED); |
20ceb2b2 LE |
4875 | /* you are supposed to send additional out-of-sync information |
4876 | * if you actually set bits during this phase */ | |
b411b363 | 4877 | |
b411b363 | 4878 | c = (struct bm_xfer_ctx) { |
b30ab791 AG |
4879 | .bm_bits = drbd_bm_bits(device), |
4880 | .bm_words = drbd_bm_words(device), | |
b411b363 PR |
4881 | }; |
4882 | ||
2c46407d | 4883 | for(;;) { |
e658983a | 4884 | if (pi->cmd == P_BITMAP) |
69a22773 | 4885 | err = receive_bitmap_plain(peer_device, pi->size, pi->data, &c); |
e658983a | 4886 | else if (pi->cmd == P_COMPRESSED_BITMAP) { |
b411b363 PR |
4887 | /* MAYBE: sanity check that we speak proto >= 90, |
4888 | * and the feature is enabled! */ | |
e658983a | 4889 | struct p_compressed_bm *p = pi->data; |
b411b363 | 4890 | |
bde89a9e | 4891 | if (pi->size > DRBD_SOCKET_BUFFER_SIZE - drbd_header_size(connection)) { |
d0180171 | 4892 | drbd_err(device, "ReportCBitmap packet too large\n"); |
82bc0194 | 4893 | err = -EIO; |
b411b363 PR |
4894 | goto out; |
4895 | } | |
e658983a | 4896 | if (pi->size <= sizeof(*p)) { |
d0180171 | 4897 | drbd_err(device, "ReportCBitmap packet too small (l:%u)\n", pi->size); |
82bc0194 | 4898 | err = -EIO; |
78fcbdae | 4899 | goto out; |
b411b363 | 4900 | } |
9f4fe9ad | 4901 | err = drbd_recv_all(peer_device->connection, p, pi->size); |
e658983a AG |
4902 | if (err) |
4903 | goto out; | |
69a22773 | 4904 | err = decode_bitmap_c(peer_device, p, &c, pi->size); |
b411b363 | 4905 | } else { |
d0180171 | 4906 | drbd_warn(device, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", pi->cmd); |
82bc0194 | 4907 | err = -EIO; |
b411b363 PR |
4908 | goto out; |
4909 | } | |
4910 | ||
e2857216 | 4911 | c.packets[pi->cmd == P_BITMAP]++; |
bde89a9e | 4912 | c.bytes[pi->cmd == P_BITMAP] += drbd_header_size(connection) + pi->size; |
b411b363 | 4913 | |
2c46407d AG |
4914 | if (err <= 0) { |
4915 | if (err < 0) | |
4916 | goto out; | |
b411b363 | 4917 | break; |
2c46407d | 4918 | } |
9f4fe9ad | 4919 | err = drbd_recv_header(peer_device->connection, pi); |
82bc0194 | 4920 | if (err) |
b411b363 | 4921 | goto out; |
2c46407d | 4922 | } |
b411b363 | 4923 | |
b30ab791 | 4924 | INFO_bm_xfer_stats(device, "receive", &c); |
b411b363 | 4925 | |
b30ab791 | 4926 | if (device->state.conn == C_WF_BITMAP_T) { |
de1f8e4a AG |
4927 | enum drbd_state_rv rv; |
4928 | ||
b30ab791 | 4929 | err = drbd_send_bitmap(device); |
82bc0194 | 4930 | if (err) |
b411b363 PR |
4931 | goto out; |
4932 | /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ | |
b30ab791 | 4933 | rv = _drbd_request_state(device, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); |
0b0ba1ef | 4934 | D_ASSERT(device, rv == SS_SUCCESS); |
b30ab791 | 4935 | } else if (device->state.conn != C_WF_BITMAP_S) { |
b411b363 PR |
4936 | /* admin may have requested C_DISCONNECTING, |
4937 | * other threads may have noticed network errors */ | |
d0180171 | 4938 | drbd_info(device, "unexpected cstate (%s) in receive_bitmap\n", |
b30ab791 | 4939 | drbd_conn_str(device->state.conn)); |
b411b363 | 4940 | } |
82bc0194 | 4941 | err = 0; |
b411b363 | 4942 | |
b411b363 | 4943 | out: |
b30ab791 AG |
4944 | drbd_bm_unlock(device); |
4945 | if (!err && device->state.conn == C_WF_BITMAP_S) | |
4946 | drbd_start_resync(device, C_SYNC_SOURCE); | |
82bc0194 | 4947 | return err; |
b411b363 PR |
4948 | } |
4949 | ||
bde89a9e | 4950 | static int receive_skip(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 4951 | { |
1ec861eb | 4952 | drbd_warn(connection, "skipping unknown optional packet type %d, l: %d!\n", |
e2857216 | 4953 | pi->cmd, pi->size); |
b411b363 | 4954 | |
bde89a9e | 4955 | return ignore_remaining_packet(connection, pi); |
b411b363 PR |
4956 | } |
4957 | ||
bde89a9e | 4958 | static int receive_UnplugRemote(struct drbd_connection *connection, struct packet_info *pi) |
0ced55a3 | 4959 | { |
e7f52dfb LE |
4960 | /* Make sure we've acked all the TCP data associated |
4961 | * with the data requests being unplugged */ | |
ddd061b8 | 4962 | tcp_sock_set_quickack(connection->data.socket->sk, 2); |
82bc0194 | 4963 | return 0; |
0ced55a3 PR |
4964 | } |
4965 | ||
bde89a9e | 4966 | static int receive_out_of_sync(struct drbd_connection *connection, struct packet_info *pi) |
73a01a18 | 4967 | { |
9f4fe9ad | 4968 | struct drbd_peer_device *peer_device; |
b30ab791 | 4969 | struct drbd_device *device; |
e658983a | 4970 | struct p_block_desc *p = pi->data; |
4a76b161 | 4971 | |
9f4fe9ad AG |
4972 | peer_device = conn_peer_device(connection, pi->vnr); |
4973 | if (!peer_device) | |
4a76b161 | 4974 | return -EIO; |
9f4fe9ad | 4975 | device = peer_device->device; |
73a01a18 | 4976 | |
b30ab791 | 4977 | switch (device->state.conn) { |
f735e363 LE |
4978 | case C_WF_SYNC_UUID: |
4979 | case C_WF_BITMAP_T: | |
4980 | case C_BEHIND: | |
4981 | break; | |
4982 | default: | |
d0180171 | 4983 | drbd_err(device, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n", |
b30ab791 | 4984 | drbd_conn_str(device->state.conn)); |
f735e363 LE |
4985 | } |
4986 | ||
b30ab791 | 4987 | drbd_set_out_of_sync(device, be64_to_cpu(p->sector), be32_to_cpu(p->blksize)); |
73a01a18 | 4988 | |
82bc0194 | 4989 | return 0; |
73a01a18 PR |
4990 | } |
4991 | ||
700ca8c0 PR |
4992 | static int receive_rs_deallocated(struct drbd_connection *connection, struct packet_info *pi) |
4993 | { | |
4994 | struct drbd_peer_device *peer_device; | |
4995 | struct p_block_desc *p = pi->data; | |
4996 | struct drbd_device *device; | |
4997 | sector_t sector; | |
4998 | int size, err = 0; | |
4999 | ||
5000 | peer_device = conn_peer_device(connection, pi->vnr); | |
5001 | if (!peer_device) | |
5002 | return -EIO; | |
5003 | device = peer_device->device; | |
5004 | ||
5005 | sector = be64_to_cpu(p->sector); | |
5006 | size = be32_to_cpu(p->blksize); | |
5007 | ||
5008 | dec_rs_pending(device); | |
5009 | ||
5010 | if (get_ldev(device)) { | |
5011 | struct drbd_peer_request *peer_req; | |
45c21793 | 5012 | const int op = REQ_OP_WRITE_ZEROES; |
700ca8c0 PR |
5013 | |
5014 | peer_req = drbd_alloc_peer_req(peer_device, ID_SYNCER, sector, | |
9104d31a | 5015 | size, 0, GFP_NOIO); |
700ca8c0 PR |
5016 | if (!peer_req) { |
5017 | put_ldev(device); | |
5018 | return -ENOMEM; | |
5019 | } | |
5020 | ||
5021 | peer_req->w.cb = e_end_resync_block; | |
5022 | peer_req->submit_jif = jiffies; | |
f31e583a | 5023 | peer_req->flags |= EE_TRIM; |
700ca8c0 PR |
5024 | |
5025 | spin_lock_irq(&device->resource->req_lock); | |
5026 | list_add_tail(&peer_req->w.list, &device->sync_ee); | |
5027 | spin_unlock_irq(&device->resource->req_lock); | |
5028 | ||
5029 | atomic_add(pi->size >> 9, &device->rs_sect_ev); | |
5030 | err = drbd_submit_peer_request(device, peer_req, op, 0, DRBD_FAULT_RS_WR); | |
5031 | ||
5032 | if (err) { | |
5033 | spin_lock_irq(&device->resource->req_lock); | |
5034 | list_del(&peer_req->w.list); | |
5035 | spin_unlock_irq(&device->resource->req_lock); | |
5036 | ||
5037 | drbd_free_peer_req(device, peer_req); | |
5038 | put_ldev(device); | |
5039 | err = 0; | |
5040 | goto fail; | |
5041 | } | |
5042 | ||
5043 | inc_unacked(device); | |
5044 | ||
5045 | /* No put_ldev() here. Gets called in drbd_endio_write_sec_final(), | |
5046 | as well as drbd_rs_complete_io() */ | |
5047 | } else { | |
5048 | fail: | |
5049 | drbd_rs_complete_io(device, sector); | |
5050 | drbd_send_ack_ex(peer_device, P_NEG_ACK, sector, size, ID_SYNCER); | |
5051 | } | |
5052 | ||
5053 | atomic_add(size >> 9, &device->rs_sect_in); | |
5054 | ||
5055 | return err; | |
5056 | } | |
5057 | ||
02918be2 PR |
5058 | struct data_cmd { |
5059 | int expect_payload; | |
9104d31a | 5060 | unsigned int pkt_size; |
bde89a9e | 5061 | int (*fn)(struct drbd_connection *, struct packet_info *); |
02918be2 PR |
5062 | }; |
5063 | ||
5064 | static struct data_cmd drbd_cmd_handler[] = { | |
5065 | [P_DATA] = { 1, sizeof(struct p_data), receive_Data }, | |
5066 | [P_DATA_REPLY] = { 1, sizeof(struct p_data), receive_DataReply }, | |
5067 | [P_RS_DATA_REPLY] = { 1, sizeof(struct p_data), receive_RSDataReply } , | |
5068 | [P_BARRIER] = { 0, sizeof(struct p_barrier), receive_Barrier } , | |
e658983a AG |
5069 | [P_BITMAP] = { 1, 0, receive_bitmap } , |
5070 | [P_COMPRESSED_BITMAP] = { 1, 0, receive_bitmap } , | |
5071 | [P_UNPLUG_REMOTE] = { 0, 0, receive_UnplugRemote }, | |
02918be2 PR |
5072 | [P_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, |
5073 | [P_RS_DATA_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, | |
e658983a AG |
5074 | [P_SYNC_PARAM] = { 1, 0, receive_SyncParam }, |
5075 | [P_SYNC_PARAM89] = { 1, 0, receive_SyncParam }, | |
02918be2 PR |
5076 | [P_PROTOCOL] = { 1, sizeof(struct p_protocol), receive_protocol }, |
5077 | [P_UUIDS] = { 0, sizeof(struct p_uuids), receive_uuids }, | |
5078 | [P_SIZES] = { 0, sizeof(struct p_sizes), receive_sizes }, | |
5079 | [P_STATE] = { 0, sizeof(struct p_state), receive_state }, | |
5080 | [P_STATE_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state }, | |
5081 | [P_SYNC_UUID] = { 0, sizeof(struct p_rs_uuid), receive_sync_uuid }, | |
5082 | [P_OV_REQUEST] = { 0, sizeof(struct p_block_req), receive_DataRequest }, | |
5083 | [P_OV_REPLY] = { 1, sizeof(struct p_block_req), receive_DataRequest }, | |
5084 | [P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest }, | |
700ca8c0 | 5085 | [P_RS_THIN_REQ] = { 0, sizeof(struct p_block_req), receive_DataRequest }, |
02918be2 | 5086 | [P_DELAY_PROBE] = { 0, sizeof(struct p_delay_probe93), receive_skip }, |
73a01a18 | 5087 | [P_OUT_OF_SYNC] = { 0, sizeof(struct p_block_desc), receive_out_of_sync }, |
4a76b161 | 5088 | [P_CONN_ST_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_conn_state }, |
036b17ea | 5089 | [P_PROTOCOL_UPDATE] = { 1, sizeof(struct p_protocol), receive_protocol }, |
a0fb3c47 | 5090 | [P_TRIM] = { 0, sizeof(struct p_trim), receive_Data }, |
f31e583a | 5091 | [P_ZEROES] = { 0, sizeof(struct p_trim), receive_Data }, |
700ca8c0 | 5092 | [P_RS_DEALLOCATED] = { 0, sizeof(struct p_block_desc), receive_rs_deallocated }, |
9104d31a | 5093 | [P_WSAME] = { 1, sizeof(struct p_wsame), receive_Data }, |
b411b363 PR |
5094 | }; |
5095 | ||
bde89a9e | 5096 | static void drbdd(struct drbd_connection *connection) |
b411b363 | 5097 | { |
77351055 | 5098 | struct packet_info pi; |
02918be2 | 5099 | size_t shs; /* sub header size */ |
82bc0194 | 5100 | int err; |
b411b363 | 5101 | |
bde89a9e | 5102 | while (get_t_state(&connection->receiver) == RUNNING) { |
9104d31a | 5103 | struct data_cmd const *cmd; |
b411b363 | 5104 | |
bde89a9e | 5105 | drbd_thread_current_set_cpu(&connection->receiver); |
c51a0ef3 LE |
5106 | update_receiver_timing_details(connection, drbd_recv_header_maybe_unplug); |
5107 | if (drbd_recv_header_maybe_unplug(connection, &pi)) | |
02918be2 | 5108 | goto err_out; |
b411b363 | 5109 | |
deebe195 | 5110 | cmd = &drbd_cmd_handler[pi.cmd]; |
4a76b161 | 5111 | if (unlikely(pi.cmd >= ARRAY_SIZE(drbd_cmd_handler) || !cmd->fn)) { |
1ec861eb | 5112 | drbd_err(connection, "Unexpected data packet %s (0x%04x)", |
2fcb8f30 | 5113 | cmdname(pi.cmd), pi.cmd); |
02918be2 | 5114 | goto err_out; |
0b33a916 | 5115 | } |
b411b363 | 5116 | |
e658983a | 5117 | shs = cmd->pkt_size; |
9104d31a LE |
5118 | if (pi.cmd == P_SIZES && connection->agreed_features & DRBD_FF_WSAME) |
5119 | shs += sizeof(struct o_qlim); | |
e658983a | 5120 | if (pi.size > shs && !cmd->expect_payload) { |
1ec861eb | 5121 | drbd_err(connection, "No payload expected %s l:%d\n", |
2fcb8f30 | 5122 | cmdname(pi.cmd), pi.size); |
02918be2 | 5123 | goto err_out; |
b411b363 | 5124 | } |
9104d31a LE |
5125 | if (pi.size < shs) { |
5126 | drbd_err(connection, "%s: unexpected packet size, expected:%d received:%d\n", | |
5127 | cmdname(pi.cmd), (int)shs, pi.size); | |
5128 | goto err_out; | |
5129 | } | |
b411b363 | 5130 | |
c13f7e1a | 5131 | if (shs) { |
944410e9 | 5132 | update_receiver_timing_details(connection, drbd_recv_all_warn); |
bde89a9e | 5133 | err = drbd_recv_all_warn(connection, pi.data, shs); |
a5c31904 | 5134 | if (err) |
c13f7e1a | 5135 | goto err_out; |
e2857216 | 5136 | pi.size -= shs; |
c13f7e1a LE |
5137 | } |
5138 | ||
944410e9 | 5139 | update_receiver_timing_details(connection, cmd->fn); |
bde89a9e | 5140 | err = cmd->fn(connection, &pi); |
4a76b161 | 5141 | if (err) { |
1ec861eb | 5142 | drbd_err(connection, "error receiving %s, e: %d l: %d!\n", |
9f5bdc33 | 5143 | cmdname(pi.cmd), err, pi.size); |
02918be2 | 5144 | goto err_out; |
b411b363 PR |
5145 | } |
5146 | } | |
82bc0194 | 5147 | return; |
b411b363 | 5148 | |
82bc0194 | 5149 | err_out: |
bde89a9e | 5150 | conn_request_state(connection, NS(conn, C_PROTOCOL_ERROR), CS_HARD); |
b411b363 PR |
5151 | } |
5152 | ||
bde89a9e | 5153 | static void conn_disconnect(struct drbd_connection *connection) |
b411b363 | 5154 | { |
c06ece6b | 5155 | struct drbd_peer_device *peer_device; |
bbeb641c | 5156 | enum drbd_conns oc; |
376694a0 | 5157 | int vnr; |
b411b363 | 5158 | |
bde89a9e | 5159 | if (connection->cstate == C_STANDALONE) |
b411b363 | 5160 | return; |
b411b363 | 5161 | |
545752d5 LE |
5162 | /* We are about to start the cleanup after connection loss. |
5163 | * Make sure drbd_make_request knows about that. | |
5164 | * Usually we should be in some network failure state already, | |
5165 | * but just in case we are not, we fix it up here. | |
5166 | */ | |
bde89a9e | 5167 | conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD); |
545752d5 | 5168 | |
668700b4 | 5169 | /* ack_receiver does not clean up anything. it must not interfere, either */ |
1c03e520 | 5170 | drbd_thread_stop(&connection->ack_receiver); |
668700b4 PR |
5171 | if (connection->ack_sender) { |
5172 | destroy_workqueue(connection->ack_sender); | |
5173 | connection->ack_sender = NULL; | |
5174 | } | |
bde89a9e | 5175 | drbd_free_sock(connection); |
360cc740 | 5176 | |
c141ebda | 5177 | rcu_read_lock(); |
c06ece6b AG |
5178 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
5179 | struct drbd_device *device = peer_device->device; | |
b30ab791 | 5180 | kref_get(&device->kref); |
c141ebda | 5181 | rcu_read_unlock(); |
69a22773 | 5182 | drbd_disconnected(peer_device); |
c06ece6b | 5183 | kref_put(&device->kref, drbd_destroy_device); |
c141ebda PR |
5184 | rcu_read_lock(); |
5185 | } | |
5186 | rcu_read_unlock(); | |
5187 | ||
bde89a9e | 5188 | if (!list_empty(&connection->current_epoch->list)) |
1ec861eb | 5189 | drbd_err(connection, "ASSERTION FAILED: connection->current_epoch->list not empty\n"); |
12038a3a | 5190 | /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ |
bde89a9e AG |
5191 | atomic_set(&connection->current_epoch->epoch_size, 0); |
5192 | connection->send.seen_any_write_yet = false; | |
12038a3a | 5193 | |
1ec861eb | 5194 | drbd_info(connection, "Connection closed\n"); |
360cc740 | 5195 | |
bde89a9e AG |
5196 | if (conn_highest_role(connection) == R_PRIMARY && conn_highest_pdsk(connection) >= D_UNKNOWN) |
5197 | conn_try_outdate_peer_async(connection); | |
cb703454 | 5198 | |
0500813f | 5199 | spin_lock_irq(&connection->resource->req_lock); |
bde89a9e | 5200 | oc = connection->cstate; |
bbeb641c | 5201 | if (oc >= C_UNCONNECTED) |
bde89a9e | 5202 | _conn_request_state(connection, NS(conn, C_UNCONNECTED), CS_VERBOSE); |
bbeb641c | 5203 | |
0500813f | 5204 | spin_unlock_irq(&connection->resource->req_lock); |
360cc740 | 5205 | |
f3dfa40a | 5206 | if (oc == C_DISCONNECTING) |
bde89a9e | 5207 | conn_request_state(connection, NS(conn, C_STANDALONE), CS_VERBOSE | CS_HARD); |
360cc740 PR |
5208 | } |
5209 | ||
69a22773 | 5210 | static int drbd_disconnected(struct drbd_peer_device *peer_device) |
360cc740 | 5211 | { |
69a22773 | 5212 | struct drbd_device *device = peer_device->device; |
360cc740 | 5213 | unsigned int i; |
b411b363 | 5214 | |
85719573 | 5215 | /* wait for current activity to cease. */ |
0500813f | 5216 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 AG |
5217 | _drbd_wait_ee_list_empty(device, &device->active_ee); |
5218 | _drbd_wait_ee_list_empty(device, &device->sync_ee); | |
5219 | _drbd_wait_ee_list_empty(device, &device->read_ee); | |
0500813f | 5220 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 PR |
5221 | |
5222 | /* We do not have data structures that would allow us to | |
5223 | * get the rs_pending_cnt down to 0 again. | |
5224 | * * On C_SYNC_TARGET we do not have any data structures describing | |
5225 | * the pending RSDataRequest's we have sent. | |
5226 | * * On C_SYNC_SOURCE there is no data structure that tracks | |
5227 | * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. | |
5228 | * And no, it is not the sum of the reference counts in the | |
5229 | * resync_LRU. The resync_LRU tracks the whole operation including | |
5230 | * the disk-IO, while the rs_pending_cnt only tracks the blocks | |
5231 | * on the fly. */ | |
b30ab791 AG |
5232 | drbd_rs_cancel_all(device); |
5233 | device->rs_total = 0; | |
5234 | device->rs_failed = 0; | |
5235 | atomic_set(&device->rs_pending_cnt, 0); | |
5236 | wake_up(&device->misc_wait); | |
b411b363 | 5237 | |
b30ab791 | 5238 | del_timer_sync(&device->resync_timer); |
2bccef39 | 5239 | resync_timer_fn(&device->resync_timer); |
b411b363 | 5240 | |
b411b363 PR |
5241 | /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, |
5242 | * w_make_resync_request etc. which may still be on the worker queue | |
5243 | * to be "canceled" */ | |
b5043c5e | 5244 | drbd_flush_workqueue(&peer_device->connection->sender_work); |
b411b363 | 5245 | |
b30ab791 | 5246 | drbd_finish_peer_reqs(device); |
b411b363 | 5247 | |
d10b4ea3 PR |
5248 | /* This second workqueue flush is necessary, since drbd_finish_peer_reqs() |
5249 | might have issued a work again. The one before drbd_finish_peer_reqs() is | |
5250 | necessary to reclain net_ee in drbd_finish_peer_reqs(). */ | |
b5043c5e | 5251 | drbd_flush_workqueue(&peer_device->connection->sender_work); |
d10b4ea3 | 5252 | |
08332d73 LE |
5253 | /* need to do it again, drbd_finish_peer_reqs() may have populated it |
5254 | * again via drbd_try_clear_on_disk_bm(). */ | |
b30ab791 | 5255 | drbd_rs_cancel_all(device); |
b411b363 | 5256 | |
b30ab791 AG |
5257 | kfree(device->p_uuid); |
5258 | device->p_uuid = NULL; | |
b411b363 | 5259 | |
b30ab791 | 5260 | if (!drbd_suspended(device)) |
69a22773 | 5261 | tl_clear(peer_device->connection); |
b411b363 | 5262 | |
b30ab791 | 5263 | drbd_md_sync(device); |
b411b363 | 5264 | |
be115b69 LE |
5265 | if (get_ldev(device)) { |
5266 | drbd_bitmap_io(device, &drbd_bm_write_copy_pages, | |
5267 | "write from disconnected", BM_LOCKED_CHANGE_ALLOWED); | |
5268 | put_ldev(device); | |
5269 | } | |
20ceb2b2 | 5270 | |
b411b363 PR |
5271 | /* tcp_close and release of sendpage pages can be deferred. I don't |
5272 | * want to use SO_LINGER, because apparently it can be deferred for | |
5273 | * more than 20 seconds (longest time I checked). | |
5274 | * | |
5275 | * Actually we don't care for exactly when the network stack does its | |
5276 | * put_page(), but release our reference on these pages right here. | |
5277 | */ | |
b30ab791 | 5278 | i = drbd_free_peer_reqs(device, &device->net_ee); |
b411b363 | 5279 | if (i) |
d0180171 | 5280 | drbd_info(device, "net_ee not empty, killed %u entries\n", i); |
b30ab791 | 5281 | i = atomic_read(&device->pp_in_use_by_net); |
435f0740 | 5282 | if (i) |
d0180171 | 5283 | drbd_info(device, "pp_in_use_by_net = %d, expected 0\n", i); |
b30ab791 | 5284 | i = atomic_read(&device->pp_in_use); |
b411b363 | 5285 | if (i) |
d0180171 | 5286 | drbd_info(device, "pp_in_use = %d, expected 0\n", i); |
b411b363 | 5287 | |
0b0ba1ef AG |
5288 | D_ASSERT(device, list_empty(&device->read_ee)); |
5289 | D_ASSERT(device, list_empty(&device->active_ee)); | |
5290 | D_ASSERT(device, list_empty(&device->sync_ee)); | |
5291 | D_ASSERT(device, list_empty(&device->done_ee)); | |
b411b363 | 5292 | |
360cc740 | 5293 | return 0; |
b411b363 PR |
5294 | } |
5295 | ||
5296 | /* | |
5297 | * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version | |
5298 | * we can agree on is stored in agreed_pro_version. | |
5299 | * | |
5300 | * feature flags and the reserved array should be enough room for future | |
5301 | * enhancements of the handshake protocol, and possible plugins... | |
5302 | * | |
5303 | * for now, they are expected to be zero, but ignored. | |
5304 | */ | |
bde89a9e | 5305 | static int drbd_send_features(struct drbd_connection *connection) |
b411b363 | 5306 | { |
9f5bdc33 AG |
5307 | struct drbd_socket *sock; |
5308 | struct p_connection_features *p; | |
b411b363 | 5309 | |
bde89a9e AG |
5310 | sock = &connection->data; |
5311 | p = conn_prepare_command(connection, sock); | |
9f5bdc33 | 5312 | if (!p) |
e8d17b01 | 5313 | return -EIO; |
b411b363 PR |
5314 | memset(p, 0, sizeof(*p)); |
5315 | p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); | |
5316 | p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); | |
20c68fde | 5317 | p->feature_flags = cpu_to_be32(PRO_FEATURES); |
bde89a9e | 5318 | return conn_send_command(connection, sock, P_CONNECTION_FEATURES, sizeof(*p), NULL, 0); |
b411b363 PR |
5319 | } |
5320 | ||
5321 | /* | |
5322 | * return values: | |
5323 | * 1 yes, we have a valid connection | |
5324 | * 0 oops, did not work out, please try again | |
5325 | * -1 peer talks different language, | |
5326 | * no point in trying again, please go standalone. | |
5327 | */ | |
bde89a9e | 5328 | static int drbd_do_features(struct drbd_connection *connection) |
b411b363 | 5329 | { |
bde89a9e | 5330 | /* ASSERT current == connection->receiver ... */ |
e658983a AG |
5331 | struct p_connection_features *p; |
5332 | const int expect = sizeof(struct p_connection_features); | |
77351055 | 5333 | struct packet_info pi; |
a5c31904 | 5334 | int err; |
b411b363 | 5335 | |
bde89a9e | 5336 | err = drbd_send_features(connection); |
e8d17b01 | 5337 | if (err) |
b411b363 PR |
5338 | return 0; |
5339 | ||
bde89a9e | 5340 | err = drbd_recv_header(connection, &pi); |
69bc7bc3 | 5341 | if (err) |
b411b363 PR |
5342 | return 0; |
5343 | ||
6038178e | 5344 | if (pi.cmd != P_CONNECTION_FEATURES) { |
1ec861eb | 5345 | drbd_err(connection, "expected ConnectionFeatures packet, received: %s (0x%04x)\n", |
2fcb8f30 | 5346 | cmdname(pi.cmd), pi.cmd); |
b411b363 PR |
5347 | return -1; |
5348 | } | |
5349 | ||
77351055 | 5350 | if (pi.size != expect) { |
1ec861eb | 5351 | drbd_err(connection, "expected ConnectionFeatures length: %u, received: %u\n", |
77351055 | 5352 | expect, pi.size); |
b411b363 PR |
5353 | return -1; |
5354 | } | |
5355 | ||
e658983a | 5356 | p = pi.data; |
bde89a9e | 5357 | err = drbd_recv_all_warn(connection, p, expect); |
a5c31904 | 5358 | if (err) |
b411b363 | 5359 | return 0; |
b411b363 | 5360 | |
b411b363 PR |
5361 | p->protocol_min = be32_to_cpu(p->protocol_min); |
5362 | p->protocol_max = be32_to_cpu(p->protocol_max); | |
5363 | if (p->protocol_max == 0) | |
5364 | p->protocol_max = p->protocol_min; | |
5365 | ||
5366 | if (PRO_VERSION_MAX < p->protocol_min || | |
5367 | PRO_VERSION_MIN > p->protocol_max) | |
5368 | goto incompat; | |
5369 | ||
bde89a9e | 5370 | connection->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); |
20c68fde | 5371 | connection->agreed_features = PRO_FEATURES & be32_to_cpu(p->feature_flags); |
b411b363 | 5372 | |
1ec861eb | 5373 | drbd_info(connection, "Handshake successful: " |
bde89a9e | 5374 | "Agreed network protocol version %d\n", connection->agreed_pro_version); |
b411b363 | 5375 | |
f31e583a | 5376 | drbd_info(connection, "Feature flags enabled on protocol level: 0x%x%s%s%s%s.\n", |
9104d31a LE |
5377 | connection->agreed_features, |
5378 | connection->agreed_features & DRBD_FF_TRIM ? " TRIM" : "", | |
5379 | connection->agreed_features & DRBD_FF_THIN_RESYNC ? " THIN_RESYNC" : "", | |
f31e583a LE |
5380 | connection->agreed_features & DRBD_FF_WSAME ? " WRITE_SAME" : "", |
5381 | connection->agreed_features & DRBD_FF_WZEROES ? " WRITE_ZEROES" : | |
9104d31a | 5382 | connection->agreed_features ? "" : " none"); |
92d94ae6 | 5383 | |
b411b363 PR |
5384 | return 1; |
5385 | ||
5386 | incompat: | |
1ec861eb | 5387 | drbd_err(connection, "incompatible DRBD dialects: " |
b411b363 PR |
5388 | "I support %d-%d, peer supports %d-%d\n", |
5389 | PRO_VERSION_MIN, PRO_VERSION_MAX, | |
5390 | p->protocol_min, p->protocol_max); | |
5391 | return -1; | |
5392 | } | |
5393 | ||
5394 | #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) | |
bde89a9e | 5395 | static int drbd_do_auth(struct drbd_connection *connection) |
b411b363 | 5396 | { |
1ec861eb AG |
5397 | drbd_err(connection, "This kernel was build without CONFIG_CRYPTO_HMAC.\n"); |
5398 | drbd_err(connection, "You need to disable 'cram-hmac-alg' in drbd.conf.\n"); | |
b10d96cb | 5399 | return -1; |
b411b363 PR |
5400 | } |
5401 | #else | |
5402 | #define CHALLENGE_LEN 64 | |
b10d96cb JT |
5403 | |
5404 | /* Return value: | |
5405 | 1 - auth succeeded, | |
5406 | 0 - failed, try again (network error), | |
5407 | -1 - auth failed, don't try again. | |
5408 | */ | |
5409 | ||
bde89a9e | 5410 | static int drbd_do_auth(struct drbd_connection *connection) |
b411b363 | 5411 | { |
9f5bdc33 | 5412 | struct drbd_socket *sock; |
b411b363 | 5413 | char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ |
b411b363 PR |
5414 | char *response = NULL; |
5415 | char *right_response = NULL; | |
5416 | char *peers_ch = NULL; | |
44ed167d PR |
5417 | unsigned int key_len; |
5418 | char secret[SHARED_SECRET_MAX]; /* 64 byte */ | |
b411b363 | 5419 | unsigned int resp_size; |
77ce56e2 | 5420 | struct shash_desc *desc; |
77351055 | 5421 | struct packet_info pi; |
44ed167d | 5422 | struct net_conf *nc; |
69bc7bc3 | 5423 | int err, rv; |
b411b363 | 5424 | |
9f5bdc33 | 5425 | /* FIXME: Put the challenge/response into the preallocated socket buffer. */ |
b411b363 | 5426 | |
44ed167d | 5427 | rcu_read_lock(); |
bde89a9e | 5428 | nc = rcu_dereference(connection->net_conf); |
44ed167d PR |
5429 | key_len = strlen(nc->shared_secret); |
5430 | memcpy(secret, nc->shared_secret, key_len); | |
5431 | rcu_read_unlock(); | |
5432 | ||
77ce56e2 AB |
5433 | desc = kmalloc(sizeof(struct shash_desc) + |
5434 | crypto_shash_descsize(connection->cram_hmac_tfm), | |
5435 | GFP_KERNEL); | |
5436 | if (!desc) { | |
5437 | rv = -1; | |
5438 | goto fail; | |
5439 | } | |
9534d671 | 5440 | desc->tfm = connection->cram_hmac_tfm; |
b411b363 | 5441 | |
9534d671 | 5442 | rv = crypto_shash_setkey(connection->cram_hmac_tfm, (u8 *)secret, key_len); |
b411b363 | 5443 | if (rv) { |
9534d671 | 5444 | drbd_err(connection, "crypto_shash_setkey() failed with %d\n", rv); |
b10d96cb | 5445 | rv = -1; |
b411b363 PR |
5446 | goto fail; |
5447 | } | |
5448 | ||
5449 | get_random_bytes(my_challenge, CHALLENGE_LEN); | |
5450 | ||
bde89a9e AG |
5451 | sock = &connection->data; |
5452 | if (!conn_prepare_command(connection, sock)) { | |
9f5bdc33 AG |
5453 | rv = 0; |
5454 | goto fail; | |
5455 | } | |
bde89a9e | 5456 | rv = !conn_send_command(connection, sock, P_AUTH_CHALLENGE, 0, |
9f5bdc33 | 5457 | my_challenge, CHALLENGE_LEN); |
b411b363 PR |
5458 | if (!rv) |
5459 | goto fail; | |
5460 | ||
bde89a9e | 5461 | err = drbd_recv_header(connection, &pi); |
69bc7bc3 AG |
5462 | if (err) { |
5463 | rv = 0; | |
b411b363 | 5464 | goto fail; |
69bc7bc3 | 5465 | } |
b411b363 | 5466 | |
77351055 | 5467 | if (pi.cmd != P_AUTH_CHALLENGE) { |
1ec861eb | 5468 | drbd_err(connection, "expected AuthChallenge packet, received: %s (0x%04x)\n", |
2fcb8f30 | 5469 | cmdname(pi.cmd), pi.cmd); |
9049ccd4 | 5470 | rv = -1; |
b411b363 PR |
5471 | goto fail; |
5472 | } | |
5473 | ||
77351055 | 5474 | if (pi.size > CHALLENGE_LEN * 2) { |
1ec861eb | 5475 | drbd_err(connection, "expected AuthChallenge payload too big.\n"); |
b10d96cb | 5476 | rv = -1; |
b411b363 PR |
5477 | goto fail; |
5478 | } | |
5479 | ||
67cca286 PR |
5480 | if (pi.size < CHALLENGE_LEN) { |
5481 | drbd_err(connection, "AuthChallenge payload too small.\n"); | |
5482 | rv = -1; | |
5483 | goto fail; | |
5484 | } | |
5485 | ||
77351055 | 5486 | peers_ch = kmalloc(pi.size, GFP_NOIO); |
b411b363 | 5487 | if (peers_ch == NULL) { |
1ec861eb | 5488 | drbd_err(connection, "kmalloc of peers_ch failed\n"); |
b10d96cb | 5489 | rv = -1; |
b411b363 PR |
5490 | goto fail; |
5491 | } | |
5492 | ||
bde89a9e | 5493 | err = drbd_recv_all_warn(connection, peers_ch, pi.size); |
a5c31904 | 5494 | if (err) { |
b411b363 PR |
5495 | rv = 0; |
5496 | goto fail; | |
5497 | } | |
5498 | ||
67cca286 PR |
5499 | if (!memcmp(my_challenge, peers_ch, CHALLENGE_LEN)) { |
5500 | drbd_err(connection, "Peer presented the same challenge!\n"); | |
5501 | rv = -1; | |
5502 | goto fail; | |
5503 | } | |
5504 | ||
9534d671 | 5505 | resp_size = crypto_shash_digestsize(connection->cram_hmac_tfm); |
b411b363 PR |
5506 | response = kmalloc(resp_size, GFP_NOIO); |
5507 | if (response == NULL) { | |
1ec861eb | 5508 | drbd_err(connection, "kmalloc of response failed\n"); |
b10d96cb | 5509 | rv = -1; |
b411b363 PR |
5510 | goto fail; |
5511 | } | |
5512 | ||
9534d671 | 5513 | rv = crypto_shash_digest(desc, peers_ch, pi.size, response); |
b411b363 | 5514 | if (rv) { |
1ec861eb | 5515 | drbd_err(connection, "crypto_hash_digest() failed with %d\n", rv); |
b10d96cb | 5516 | rv = -1; |
b411b363 PR |
5517 | goto fail; |
5518 | } | |
5519 | ||
bde89a9e | 5520 | if (!conn_prepare_command(connection, sock)) { |
9f5bdc33 | 5521 | rv = 0; |
b411b363 | 5522 | goto fail; |
9f5bdc33 | 5523 | } |
bde89a9e | 5524 | rv = !conn_send_command(connection, sock, P_AUTH_RESPONSE, 0, |
9f5bdc33 | 5525 | response, resp_size); |
b411b363 PR |
5526 | if (!rv) |
5527 | goto fail; | |
5528 | ||
bde89a9e | 5529 | err = drbd_recv_header(connection, &pi); |
69bc7bc3 | 5530 | if (err) { |
b411b363 PR |
5531 | rv = 0; |
5532 | goto fail; | |
5533 | } | |
5534 | ||
77351055 | 5535 | if (pi.cmd != P_AUTH_RESPONSE) { |
1ec861eb | 5536 | drbd_err(connection, "expected AuthResponse packet, received: %s (0x%04x)\n", |
2fcb8f30 | 5537 | cmdname(pi.cmd), pi.cmd); |
b411b363 PR |
5538 | rv = 0; |
5539 | goto fail; | |
5540 | } | |
5541 | ||
77351055 | 5542 | if (pi.size != resp_size) { |
1ec861eb | 5543 | drbd_err(connection, "expected AuthResponse payload of wrong size\n"); |
b411b363 PR |
5544 | rv = 0; |
5545 | goto fail; | |
5546 | } | |
b411b363 | 5547 | |
bde89a9e | 5548 | err = drbd_recv_all_warn(connection, response , resp_size); |
a5c31904 | 5549 | if (err) { |
b411b363 PR |
5550 | rv = 0; |
5551 | goto fail; | |
5552 | } | |
5553 | ||
5554 | right_response = kmalloc(resp_size, GFP_NOIO); | |
2d1ee87d | 5555 | if (right_response == NULL) { |
1ec861eb | 5556 | drbd_err(connection, "kmalloc of right_response failed\n"); |
b10d96cb | 5557 | rv = -1; |
b411b363 PR |
5558 | goto fail; |
5559 | } | |
5560 | ||
9534d671 HX |
5561 | rv = crypto_shash_digest(desc, my_challenge, CHALLENGE_LEN, |
5562 | right_response); | |
b411b363 | 5563 | if (rv) { |
1ec861eb | 5564 | drbd_err(connection, "crypto_hash_digest() failed with %d\n", rv); |
b10d96cb | 5565 | rv = -1; |
b411b363 PR |
5566 | goto fail; |
5567 | } | |
5568 | ||
5569 | rv = !memcmp(response, right_response, resp_size); | |
5570 | ||
5571 | if (rv) | |
1ec861eb | 5572 | drbd_info(connection, "Peer authenticated using %d bytes HMAC\n", |
44ed167d | 5573 | resp_size); |
b10d96cb JT |
5574 | else |
5575 | rv = -1; | |
b411b363 PR |
5576 | |
5577 | fail: | |
5578 | kfree(peers_ch); | |
5579 | kfree(response); | |
5580 | kfree(right_response); | |
77ce56e2 AB |
5581 | if (desc) { |
5582 | shash_desc_zero(desc); | |
5583 | kfree(desc); | |
5584 | } | |
b411b363 PR |
5585 | |
5586 | return rv; | |
5587 | } | |
5588 | #endif | |
5589 | ||
8fe60551 | 5590 | int drbd_receiver(struct drbd_thread *thi) |
b411b363 | 5591 | { |
bde89a9e | 5592 | struct drbd_connection *connection = thi->connection; |
b411b363 PR |
5593 | int h; |
5594 | ||
1ec861eb | 5595 | drbd_info(connection, "receiver (re)started\n"); |
b411b363 PR |
5596 | |
5597 | do { | |
bde89a9e | 5598 | h = conn_connect(connection); |
b411b363 | 5599 | if (h == 0) { |
bde89a9e | 5600 | conn_disconnect(connection); |
20ee6390 | 5601 | schedule_timeout_interruptible(HZ); |
b411b363 PR |
5602 | } |
5603 | if (h == -1) { | |
1ec861eb | 5604 | drbd_warn(connection, "Discarding network configuration.\n"); |
bde89a9e | 5605 | conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 PR |
5606 | } |
5607 | } while (h == 0); | |
5608 | ||
c51a0ef3 LE |
5609 | if (h > 0) { |
5610 | blk_start_plug(&connection->receiver_plug); | |
bde89a9e | 5611 | drbdd(connection); |
c51a0ef3 LE |
5612 | blk_finish_plug(&connection->receiver_plug); |
5613 | } | |
b411b363 | 5614 | |
bde89a9e | 5615 | conn_disconnect(connection); |
b411b363 | 5616 | |
1ec861eb | 5617 | drbd_info(connection, "receiver terminated\n"); |
b411b363 PR |
5618 | return 0; |
5619 | } | |
5620 | ||
5621 | /* ********* acknowledge sender ******** */ | |
5622 | ||
bde89a9e | 5623 | static int got_conn_RqSReply(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5624 | { |
e658983a | 5625 | struct p_req_state_reply *p = pi->data; |
e4f78ede PR |
5626 | int retcode = be32_to_cpu(p->retcode); |
5627 | ||
5628 | if (retcode >= SS_SUCCESS) { | |
bde89a9e | 5629 | set_bit(CONN_WD_ST_CHG_OKAY, &connection->flags); |
e4f78ede | 5630 | } else { |
bde89a9e | 5631 | set_bit(CONN_WD_ST_CHG_FAIL, &connection->flags); |
1ec861eb | 5632 | drbd_err(connection, "Requested state change failed by peer: %s (%d)\n", |
e4f78ede PR |
5633 | drbd_set_st_err_str(retcode), retcode); |
5634 | } | |
bde89a9e | 5635 | wake_up(&connection->ping_wait); |
e4f78ede | 5636 | |
2735a594 | 5637 | return 0; |
e4f78ede | 5638 | } |
b411b363 | 5639 | |
bde89a9e | 5640 | static int got_RqSReply(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5641 | { |
9f4fe9ad | 5642 | struct drbd_peer_device *peer_device; |
b30ab791 | 5643 | struct drbd_device *device; |
e658983a | 5644 | struct p_req_state_reply *p = pi->data; |
b411b363 PR |
5645 | int retcode = be32_to_cpu(p->retcode); |
5646 | ||
9f4fe9ad AG |
5647 | peer_device = conn_peer_device(connection, pi->vnr); |
5648 | if (!peer_device) | |
2735a594 | 5649 | return -EIO; |
9f4fe9ad | 5650 | device = peer_device->device; |
1952e916 | 5651 | |
bde89a9e | 5652 | if (test_bit(CONN_WD_ST_CHG_REQ, &connection->flags)) { |
0b0ba1ef | 5653 | D_ASSERT(device, connection->agreed_pro_version < 100); |
bde89a9e | 5654 | return got_conn_RqSReply(connection, pi); |
4d0fc3fd PR |
5655 | } |
5656 | ||
b411b363 | 5657 | if (retcode >= SS_SUCCESS) { |
b30ab791 | 5658 | set_bit(CL_ST_CHG_SUCCESS, &device->flags); |
b411b363 | 5659 | } else { |
b30ab791 | 5660 | set_bit(CL_ST_CHG_FAIL, &device->flags); |
d0180171 | 5661 | drbd_err(device, "Requested state change failed by peer: %s (%d)\n", |
e4f78ede | 5662 | drbd_set_st_err_str(retcode), retcode); |
b411b363 | 5663 | } |
b30ab791 | 5664 | wake_up(&device->state_wait); |
b411b363 | 5665 | |
2735a594 | 5666 | return 0; |
b411b363 PR |
5667 | } |
5668 | ||
bde89a9e | 5669 | static int got_Ping(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5670 | { |
bde89a9e | 5671 | return drbd_send_ping_ack(connection); |
b411b363 PR |
5672 | |
5673 | } | |
5674 | ||
bde89a9e | 5675 | static int got_PingAck(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 PR |
5676 | { |
5677 | /* restore idle timeout */ | |
bde89a9e AG |
5678 | connection->meta.socket->sk->sk_rcvtimeo = connection->net_conf->ping_int*HZ; |
5679 | if (!test_and_set_bit(GOT_PING_ACK, &connection->flags)) | |
5680 | wake_up(&connection->ping_wait); | |
b411b363 | 5681 | |
2735a594 | 5682 | return 0; |
b411b363 PR |
5683 | } |
5684 | ||
bde89a9e | 5685 | static int got_IsInSync(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5686 | { |
9f4fe9ad | 5687 | struct drbd_peer_device *peer_device; |
b30ab791 | 5688 | struct drbd_device *device; |
e658983a | 5689 | struct p_block_ack *p = pi->data; |
b411b363 PR |
5690 | sector_t sector = be64_to_cpu(p->sector); |
5691 | int blksize = be32_to_cpu(p->blksize); | |
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 | |
9f4fe9ad | 5698 | D_ASSERT(device, peer_device->connection->agreed_pro_version >= 89); |
b411b363 | 5699 | |
69a22773 | 5700 | update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
b411b363 | 5701 | |
b30ab791 AG |
5702 | if (get_ldev(device)) { |
5703 | drbd_rs_complete_io(device, sector); | |
5704 | drbd_set_in_sync(device, sector, blksize); | |
1d53f09e | 5705 | /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ |
b30ab791 AG |
5706 | device->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); |
5707 | put_ldev(device); | |
1d53f09e | 5708 | } |
b30ab791 AG |
5709 | dec_rs_pending(device); |
5710 | atomic_add(blksize >> 9, &device->rs_sect_in); | |
b411b363 | 5711 | |
2735a594 | 5712 | return 0; |
b411b363 PR |
5713 | } |
5714 | ||
bc9c5c41 | 5715 | static int |
b30ab791 | 5716 | validate_req_change_req_state(struct drbd_device *device, u64 id, sector_t sector, |
bc9c5c41 AG |
5717 | struct rb_root *root, const char *func, |
5718 | enum drbd_req_event what, bool missing_ok) | |
b411b363 PR |
5719 | { |
5720 | struct drbd_request *req; | |
5721 | struct bio_and_error m; | |
5722 | ||
0500813f | 5723 | spin_lock_irq(&device->resource->req_lock); |
b30ab791 | 5724 | req = find_request(device, root, id, sector, missing_ok, func); |
b411b363 | 5725 | if (unlikely(!req)) { |
0500813f | 5726 | spin_unlock_irq(&device->resource->req_lock); |
85997675 | 5727 | return -EIO; |
b411b363 PR |
5728 | } |
5729 | __req_mod(req, what, &m); | |
0500813f | 5730 | spin_unlock_irq(&device->resource->req_lock); |
b411b363 PR |
5731 | |
5732 | if (m.bio) | |
b30ab791 | 5733 | complete_master_bio(device, &m); |
85997675 | 5734 | return 0; |
b411b363 PR |
5735 | } |
5736 | ||
bde89a9e | 5737 | static int got_BlockAck(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5738 | { |
9f4fe9ad | 5739 | struct drbd_peer_device *peer_device; |
b30ab791 | 5740 | struct drbd_device *device; |
e658983a | 5741 | struct p_block_ack *p = pi->data; |
b411b363 PR |
5742 | sector_t sector = be64_to_cpu(p->sector); |
5743 | int blksize = be32_to_cpu(p->blksize); | |
5744 | enum drbd_req_event what; | |
5745 | ||
9f4fe9ad AG |
5746 | peer_device = conn_peer_device(connection, pi->vnr); |
5747 | if (!peer_device) | |
2735a594 | 5748 | return -EIO; |
9f4fe9ad | 5749 | device = peer_device->device; |
1952e916 | 5750 | |
69a22773 | 5751 | update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
b411b363 | 5752 | |
579b57ed | 5753 | if (p->block_id == ID_SYNCER) { |
b30ab791 AG |
5754 | drbd_set_in_sync(device, sector, blksize); |
5755 | dec_rs_pending(device); | |
2735a594 | 5756 | return 0; |
b411b363 | 5757 | } |
e05e1e59 | 5758 | switch (pi->cmd) { |
b411b363 | 5759 | case P_RS_WRITE_ACK: |
8554df1c | 5760 | what = WRITE_ACKED_BY_PEER_AND_SIS; |
b411b363 PR |
5761 | break; |
5762 | case P_WRITE_ACK: | |
8554df1c | 5763 | what = WRITE_ACKED_BY_PEER; |
b411b363 PR |
5764 | break; |
5765 | case P_RECV_ACK: | |
8554df1c | 5766 | what = RECV_ACKED_BY_PEER; |
b411b363 | 5767 | break; |
d4dabbe2 LE |
5768 | case P_SUPERSEDED: |
5769 | what = CONFLICT_RESOLVED; | |
b411b363 | 5770 | break; |
7be8da07 | 5771 | case P_RETRY_WRITE: |
7be8da07 | 5772 | what = POSTPONE_WRITE; |
b411b363 PR |
5773 | break; |
5774 | default: | |
2735a594 | 5775 | BUG(); |
b411b363 PR |
5776 | } |
5777 | ||
b30ab791 AG |
5778 | return validate_req_change_req_state(device, p->block_id, sector, |
5779 | &device->write_requests, __func__, | |
2735a594 | 5780 | what, false); |
b411b363 PR |
5781 | } |
5782 | ||
bde89a9e | 5783 | static int got_NegAck(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5784 | { |
9f4fe9ad | 5785 | struct drbd_peer_device *peer_device; |
b30ab791 | 5786 | struct drbd_device *device; |
e658983a | 5787 | struct p_block_ack *p = pi->data; |
b411b363 | 5788 | sector_t sector = be64_to_cpu(p->sector); |
2deb8336 | 5789 | int size = be32_to_cpu(p->blksize); |
85997675 | 5790 | int err; |
b411b363 | 5791 | |
9f4fe9ad AG |
5792 | peer_device = conn_peer_device(connection, pi->vnr); |
5793 | if (!peer_device) | |
2735a594 | 5794 | return -EIO; |
9f4fe9ad | 5795 | device = peer_device->device; |
b411b363 | 5796 | |
69a22773 | 5797 | update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
b411b363 | 5798 | |
579b57ed | 5799 | if (p->block_id == ID_SYNCER) { |
b30ab791 AG |
5800 | dec_rs_pending(device); |
5801 | drbd_rs_failed_io(device, sector, size); | |
2735a594 | 5802 | return 0; |
b411b363 | 5803 | } |
2deb8336 | 5804 | |
b30ab791 AG |
5805 | err = validate_req_change_req_state(device, p->block_id, sector, |
5806 | &device->write_requests, __func__, | |
303d1448 | 5807 | NEG_ACKED, true); |
85997675 | 5808 | if (err) { |
c3afd8f5 AG |
5809 | /* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs. |
5810 | The master bio might already be completed, therefore the | |
5811 | request is no longer in the collision hash. */ | |
5812 | /* In Protocol B we might already have got a P_RECV_ACK | |
5813 | but then get a P_NEG_ACK afterwards. */ | |
b30ab791 | 5814 | drbd_set_out_of_sync(device, sector, size); |
2deb8336 | 5815 | } |
2735a594 | 5816 | return 0; |
b411b363 PR |
5817 | } |
5818 | ||
bde89a9e | 5819 | static int got_NegDReply(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5820 | { |
9f4fe9ad | 5821 | struct drbd_peer_device *peer_device; |
b30ab791 | 5822 | struct drbd_device *device; |
e658983a | 5823 | struct p_block_ack *p = pi->data; |
b411b363 PR |
5824 | sector_t sector = be64_to_cpu(p->sector); |
5825 | ||
9f4fe9ad AG |
5826 | peer_device = conn_peer_device(connection, pi->vnr); |
5827 | if (!peer_device) | |
2735a594 | 5828 | return -EIO; |
9f4fe9ad | 5829 | device = peer_device->device; |
1952e916 | 5830 | |
69a22773 | 5831 | update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
7be8da07 | 5832 | |
d0180171 | 5833 | drbd_err(device, "Got NegDReply; Sector %llus, len %u.\n", |
b411b363 PR |
5834 | (unsigned long long)sector, be32_to_cpu(p->blksize)); |
5835 | ||
b30ab791 AG |
5836 | return validate_req_change_req_state(device, p->block_id, sector, |
5837 | &device->read_requests, __func__, | |
2735a594 | 5838 | NEG_ACKED, false); |
b411b363 PR |
5839 | } |
5840 | ||
bde89a9e | 5841 | static int got_NegRSDReply(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5842 | { |
9f4fe9ad | 5843 | struct drbd_peer_device *peer_device; |
b30ab791 | 5844 | struct drbd_device *device; |
b411b363 PR |
5845 | sector_t sector; |
5846 | int size; | |
e658983a | 5847 | struct p_block_ack *p = pi->data; |
1952e916 | 5848 | |
9f4fe9ad AG |
5849 | peer_device = conn_peer_device(connection, pi->vnr); |
5850 | if (!peer_device) | |
2735a594 | 5851 | return -EIO; |
9f4fe9ad | 5852 | device = peer_device->device; |
b411b363 PR |
5853 | |
5854 | sector = be64_to_cpu(p->sector); | |
5855 | size = be32_to_cpu(p->blksize); | |
b411b363 | 5856 | |
69a22773 | 5857 | update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
b411b363 | 5858 | |
b30ab791 | 5859 | dec_rs_pending(device); |
b411b363 | 5860 | |
b30ab791 AG |
5861 | if (get_ldev_if_state(device, D_FAILED)) { |
5862 | drbd_rs_complete_io(device, sector); | |
e05e1e59 | 5863 | switch (pi->cmd) { |
d612d309 | 5864 | case P_NEG_RS_DREPLY: |
b30ab791 | 5865 | drbd_rs_failed_io(device, sector, size); |
d612d309 PR |
5866 | case P_RS_CANCEL: |
5867 | break; | |
5868 | default: | |
2735a594 | 5869 | BUG(); |
d612d309 | 5870 | } |
b30ab791 | 5871 | put_ldev(device); |
b411b363 PR |
5872 | } |
5873 | ||
2735a594 | 5874 | return 0; |
b411b363 PR |
5875 | } |
5876 | ||
bde89a9e | 5877 | static int got_BarrierAck(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5878 | { |
e658983a | 5879 | struct p_barrier_ack *p = pi->data; |
c06ece6b | 5880 | struct drbd_peer_device *peer_device; |
9ed57dcb | 5881 | int vnr; |
1952e916 | 5882 | |
bde89a9e | 5883 | tl_release(connection, p->barrier, be32_to_cpu(p->set_size)); |
b411b363 | 5884 | |
9ed57dcb | 5885 | rcu_read_lock(); |
c06ece6b AG |
5886 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
5887 | struct drbd_device *device = peer_device->device; | |
5888 | ||
b30ab791 AG |
5889 | if (device->state.conn == C_AHEAD && |
5890 | atomic_read(&device->ap_in_flight) == 0 && | |
5891 | !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &device->flags)) { | |
5892 | device->start_resync_timer.expires = jiffies + HZ; | |
5893 | add_timer(&device->start_resync_timer); | |
9ed57dcb | 5894 | } |
c4752ef1 | 5895 | } |
9ed57dcb | 5896 | rcu_read_unlock(); |
c4752ef1 | 5897 | |
2735a594 | 5898 | return 0; |
b411b363 PR |
5899 | } |
5900 | ||
bde89a9e | 5901 | static int got_OVResult(struct drbd_connection *connection, struct packet_info *pi) |
b411b363 | 5902 | { |
9f4fe9ad | 5903 | struct drbd_peer_device *peer_device; |
b30ab791 | 5904 | struct drbd_device *device; |
e658983a | 5905 | struct p_block_ack *p = pi->data; |
84b8c06b | 5906 | struct drbd_device_work *dw; |
b411b363 PR |
5907 | sector_t sector; |
5908 | int size; | |
5909 | ||
9f4fe9ad AG |
5910 | peer_device = conn_peer_device(connection, pi->vnr); |
5911 | if (!peer_device) | |
2735a594 | 5912 | return -EIO; |
9f4fe9ad | 5913 | device = peer_device->device; |
1952e916 | 5914 | |
b411b363 PR |
5915 | sector = be64_to_cpu(p->sector); |
5916 | size = be32_to_cpu(p->blksize); | |
5917 | ||
69a22773 | 5918 | update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
b411b363 PR |
5919 | |
5920 | if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) | |
b30ab791 | 5921 | drbd_ov_out_of_sync_found(device, sector, size); |
b411b363 | 5922 | else |
b30ab791 | 5923 | ov_out_of_sync_print(device); |
b411b363 | 5924 | |
b30ab791 | 5925 | if (!get_ldev(device)) |
2735a594 | 5926 | return 0; |
1d53f09e | 5927 | |
b30ab791 AG |
5928 | drbd_rs_complete_io(device, sector); |
5929 | dec_rs_pending(device); | |
b411b363 | 5930 | |
b30ab791 | 5931 | --device->ov_left; |
ea5442af LE |
5932 | |
5933 | /* let's advance progress step marks only for every other megabyte */ | |
b30ab791 AG |
5934 | if ((device->ov_left & 0x200) == 0x200) |
5935 | drbd_advance_rs_marks(device, device->ov_left); | |
ea5442af | 5936 | |
b30ab791 | 5937 | if (device->ov_left == 0) { |
84b8c06b AG |
5938 | dw = kmalloc(sizeof(*dw), GFP_NOIO); |
5939 | if (dw) { | |
5940 | dw->w.cb = w_ov_finished; | |
5941 | dw->device = device; | |
5942 | drbd_queue_work(&peer_device->connection->sender_work, &dw->w); | |
b411b363 | 5943 | } else { |
84b8c06b | 5944 | drbd_err(device, "kmalloc(dw) failed."); |
b30ab791 AG |
5945 | ov_out_of_sync_print(device); |
5946 | drbd_resync_finished(device); | |
b411b363 PR |
5947 | } |
5948 | } | |
b30ab791 | 5949 | put_ldev(device); |
2735a594 | 5950 | return 0; |
b411b363 PR |
5951 | } |
5952 | ||
bde89a9e | 5953 | static int got_skip(struct drbd_connection *connection, struct packet_info *pi) |
0ced55a3 | 5954 | { |
2735a594 | 5955 | return 0; |
b411b363 PR |
5956 | } |
5957 | ||
668700b4 PR |
5958 | struct meta_sock_cmd { |
5959 | size_t pkt_size; | |
5960 | int (*fn)(struct drbd_connection *connection, struct packet_info *); | |
5961 | }; | |
5962 | ||
5963 | static void set_rcvtimeo(struct drbd_connection *connection, bool ping_timeout) | |
0ced55a3 | 5964 | { |
668700b4 PR |
5965 | long t; |
5966 | struct net_conf *nc; | |
32862ec7 | 5967 | |
668700b4 PR |
5968 | rcu_read_lock(); |
5969 | nc = rcu_dereference(connection->net_conf); | |
5970 | t = ping_timeout ? nc->ping_timeo : nc->ping_int; | |
5971 | rcu_read_unlock(); | |
c141ebda | 5972 | |
668700b4 PR |
5973 | t *= HZ; |
5974 | if (ping_timeout) | |
5975 | t /= 10; | |
082a3439 | 5976 | |
668700b4 PR |
5977 | connection->meta.socket->sk->sk_rcvtimeo = t; |
5978 | } | |
32862ec7 | 5979 | |
668700b4 PR |
5980 | static void set_ping_timeout(struct drbd_connection *connection) |
5981 | { | |
5982 | set_rcvtimeo(connection, 1); | |
0ced55a3 PR |
5983 | } |
5984 | ||
668700b4 PR |
5985 | static void set_idle_timeout(struct drbd_connection *connection) |
5986 | { | |
5987 | set_rcvtimeo(connection, 0); | |
5988 | } | |
b411b363 | 5989 | |
668700b4 | 5990 | static struct meta_sock_cmd ack_receiver_tbl[] = { |
e658983a AG |
5991 | [P_PING] = { 0, got_Ping }, |
5992 | [P_PING_ACK] = { 0, got_PingAck }, | |
b411b363 PR |
5993 | [P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, |
5994 | [P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, | |
5995 | [P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck }, | |
d4dabbe2 | 5996 | [P_SUPERSEDED] = { sizeof(struct p_block_ack), got_BlockAck }, |
b411b363 PR |
5997 | [P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck }, |
5998 | [P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply }, | |
1952e916 | 5999 | [P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply }, |
b411b363 PR |
6000 | [P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult }, |
6001 | [P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck }, | |
6002 | [P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply }, | |
6003 | [P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync }, | |
02918be2 | 6004 | [P_DELAY_PROBE] = { sizeof(struct p_delay_probe93), got_skip }, |
1952e916 AG |
6005 | [P_RS_CANCEL] = { sizeof(struct p_block_ack), got_NegRSDReply }, |
6006 | [P_CONN_ST_CHG_REPLY]={ sizeof(struct p_req_state_reply), got_conn_RqSReply }, | |
6007 | [P_RETRY_WRITE] = { sizeof(struct p_block_ack), got_BlockAck }, | |
7201b972 | 6008 | }; |
b411b363 | 6009 | |
1c03e520 | 6010 | int drbd_ack_receiver(struct drbd_thread *thi) |
b411b363 | 6011 | { |
bde89a9e | 6012 | struct drbd_connection *connection = thi->connection; |
668700b4 | 6013 | struct meta_sock_cmd *cmd = NULL; |
77351055 | 6014 | struct packet_info pi; |
668700b4 | 6015 | unsigned long pre_recv_jif; |
257d0af6 | 6016 | int rv; |
bde89a9e | 6017 | void *buf = connection->meta.rbuf; |
b411b363 | 6018 | int received = 0; |
bde89a9e | 6019 | unsigned int header_size = drbd_header_size(connection); |
52b061a4 | 6020 | int expect = header_size; |
44ed167d | 6021 | bool ping_timeout_active = false; |
b411b363 | 6022 | |
8b700983 | 6023 | sched_set_fifo_low(current); |
b411b363 | 6024 | |
e77a0a5c | 6025 | while (get_t_state(thi) == RUNNING) { |
80822284 | 6026 | drbd_thread_current_set_cpu(thi); |
b411b363 | 6027 | |
668700b4 | 6028 | conn_reclaim_net_peer_reqs(connection); |
44ed167d | 6029 | |
bde89a9e AG |
6030 | if (test_and_clear_bit(SEND_PING, &connection->flags)) { |
6031 | if (drbd_send_ping(connection)) { | |
1ec861eb | 6032 | drbd_err(connection, "drbd_send_ping has failed\n"); |
b411b363 | 6033 | goto reconnect; |
841ce241 | 6034 | } |
668700b4 | 6035 | set_ping_timeout(connection); |
44ed167d | 6036 | ping_timeout_active = true; |
b411b363 PR |
6037 | } |
6038 | ||
668700b4 | 6039 | pre_recv_jif = jiffies; |
bde89a9e | 6040 | rv = drbd_recv_short(connection->meta.socket, buf, expect-received, 0); |
b411b363 PR |
6041 | |
6042 | /* Note: | |
6043 | * -EINTR (on meta) we got a signal | |
6044 | * -EAGAIN (on meta) rcvtimeo expired | |
6045 | * -ECONNRESET other side closed the connection | |
6046 | * -ERESTARTSYS (on data) we got a signal | |
6047 | * rv < 0 other than above: unexpected error! | |
6048 | * rv == expected: full header or command | |
6049 | * rv < expected: "woken" by signal during receive | |
6050 | * rv == 0 : "connection shut down by peer" | |
6051 | */ | |
6052 | if (likely(rv > 0)) { | |
6053 | received += rv; | |
6054 | buf += rv; | |
6055 | } else if (rv == 0) { | |
bde89a9e | 6056 | if (test_bit(DISCONNECT_SENT, &connection->flags)) { |
b66623e3 PR |
6057 | long t; |
6058 | rcu_read_lock(); | |
bde89a9e | 6059 | t = rcu_dereference(connection->net_conf)->ping_timeo * HZ/10; |
b66623e3 PR |
6060 | rcu_read_unlock(); |
6061 | ||
bde89a9e AG |
6062 | t = wait_event_timeout(connection->ping_wait, |
6063 | connection->cstate < C_WF_REPORT_PARAMS, | |
b66623e3 | 6064 | t); |
599377ac PR |
6065 | if (t) |
6066 | break; | |
6067 | } | |
1ec861eb | 6068 | drbd_err(connection, "meta connection shut down by peer.\n"); |
b411b363 PR |
6069 | goto reconnect; |
6070 | } else if (rv == -EAGAIN) { | |
cb6518cb LE |
6071 | /* If the data socket received something meanwhile, |
6072 | * that is good enough: peer is still alive. */ | |
668700b4 | 6073 | if (time_after(connection->last_received, pre_recv_jif)) |
cb6518cb | 6074 | continue; |
f36af18c | 6075 | if (ping_timeout_active) { |
1ec861eb | 6076 | drbd_err(connection, "PingAck did not arrive in time.\n"); |
b411b363 PR |
6077 | goto reconnect; |
6078 | } | |
bde89a9e | 6079 | set_bit(SEND_PING, &connection->flags); |
b411b363 PR |
6080 | continue; |
6081 | } else if (rv == -EINTR) { | |
668700b4 PR |
6082 | /* maybe drbd_thread_stop(): the while condition will notice. |
6083 | * maybe woken for send_ping: we'll send a ping above, | |
6084 | * and change the rcvtimeo */ | |
6085 | flush_signals(current); | |
b411b363 PR |
6086 | continue; |
6087 | } else { | |
1ec861eb | 6088 | drbd_err(connection, "sock_recvmsg returned %d\n", rv); |
b411b363 PR |
6089 | goto reconnect; |
6090 | } | |
6091 | ||
6092 | if (received == expect && cmd == NULL) { | |
bde89a9e | 6093 | if (decode_header(connection, connection->meta.rbuf, &pi)) |
b411b363 | 6094 | goto reconnect; |
668700b4 PR |
6095 | cmd = &ack_receiver_tbl[pi.cmd]; |
6096 | if (pi.cmd >= ARRAY_SIZE(ack_receiver_tbl) || !cmd->fn) { | |
1ec861eb | 6097 | drbd_err(connection, "Unexpected meta packet %s (0x%04x)\n", |
2fcb8f30 | 6098 | cmdname(pi.cmd), pi.cmd); |
b411b363 PR |
6099 | goto disconnect; |
6100 | } | |
e658983a | 6101 | expect = header_size + cmd->pkt_size; |
52b061a4 | 6102 | if (pi.size != expect - header_size) { |
1ec861eb | 6103 | drbd_err(connection, "Wrong packet size on meta (c: %d, l: %d)\n", |
77351055 | 6104 | pi.cmd, pi.size); |
b411b363 | 6105 | goto reconnect; |
257d0af6 | 6106 | } |
b411b363 PR |
6107 | } |
6108 | if (received == expect) { | |
2735a594 | 6109 | bool err; |
a4fbda8e | 6110 | |
bde89a9e | 6111 | err = cmd->fn(connection, &pi); |
2735a594 | 6112 | if (err) { |
d75f773c | 6113 | drbd_err(connection, "%ps failed\n", cmd->fn); |
b411b363 | 6114 | goto reconnect; |
1952e916 | 6115 | } |
b411b363 | 6116 | |
bde89a9e | 6117 | connection->last_received = jiffies; |
f36af18c | 6118 | |
668700b4 PR |
6119 | if (cmd == &ack_receiver_tbl[P_PING_ACK]) { |
6120 | set_idle_timeout(connection); | |
44ed167d PR |
6121 | ping_timeout_active = false; |
6122 | } | |
f36af18c | 6123 | |
bde89a9e | 6124 | buf = connection->meta.rbuf; |
b411b363 | 6125 | received = 0; |
52b061a4 | 6126 | expect = header_size; |
b411b363 PR |
6127 | cmd = NULL; |
6128 | } | |
6129 | } | |
6130 | ||
6131 | if (0) { | |
6132 | reconnect: | |
bde89a9e AG |
6133 | conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD); |
6134 | conn_md_sync(connection); | |
b411b363 PR |
6135 | } |
6136 | if (0) { | |
6137 | disconnect: | |
bde89a9e | 6138 | conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD); |
b411b363 | 6139 | } |
b411b363 | 6140 | |
668700b4 | 6141 | drbd_info(connection, "ack_receiver terminated\n"); |
b411b363 PR |
6142 | |
6143 | return 0; | |
6144 | } | |
668700b4 PR |
6145 | |
6146 | void drbd_send_acks_wf(struct work_struct *ws) | |
6147 | { | |
6148 | struct drbd_peer_device *peer_device = | |
6149 | container_of(ws, struct drbd_peer_device, send_acks_work); | |
6150 | struct drbd_connection *connection = peer_device->connection; | |
6151 | struct drbd_device *device = peer_device->device; | |
6152 | struct net_conf *nc; | |
6153 | int tcp_cork, err; | |
6154 | ||
6155 | rcu_read_lock(); | |
6156 | nc = rcu_dereference(connection->net_conf); | |
6157 | tcp_cork = nc->tcp_cork; | |
6158 | rcu_read_unlock(); | |
6159 | ||
6160 | if (tcp_cork) | |
db10538a | 6161 | tcp_sock_set_cork(connection->meta.socket->sk, true); |
668700b4 PR |
6162 | |
6163 | err = drbd_finish_peer_reqs(device); | |
6164 | kref_put(&device->kref, drbd_destroy_device); | |
6165 | /* get is in drbd_endio_write_sec_final(). That is necessary to keep the | |
6166 | struct work_struct send_acks_work alive, which is in the peer_device object */ | |
6167 | ||
6168 | if (err) { | |
6169 | conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), CS_HARD); | |
6170 | return; | |
6171 | } | |
6172 | ||
6173 | if (tcp_cork) | |
db10538a | 6174 | tcp_sock_set_cork(connection->meta.socket->sk, false); |
668700b4 PR |
6175 | |
6176 | return; | |
6177 | } |