1 | // SPDX-License-Identifier: GPL-2.0-only |
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 | |
11 | */ |
12 | |
13 | |
14 | #include <linux/module.h> |
15 | |
16 | #include <linux/uaccess.h> |
17 | #include <net/sock.h> |
18 | |
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> |
27 | #include <uapi/linux/sched/types.h> |
28 | #include <linux/sched/signal.h> |
29 | #include <linux/pkt_sched.h> |
30 | #include <linux/unistd.h> |
31 | #include <linux/vmalloc.h> |
32 | #include <linux/random.h> |
33 | #include <linux/string.h> |
34 | #include <linux/scatterlist.h> |
35 | #include <linux/part_stat.h> |
36 | #include "drbd_int.h" |
37 | #include "drbd_protocol.h" |
38 | #include "drbd_req.h" |
39 | #include "drbd_vli.h" |
40 | |
41 | #define PRO_FEATURES (DRBD_FF_TRIM|DRBD_FF_THIN_RESYNC|DRBD_FF_WSAME|DRBD_FF_WZEROES) |
42 | |
43 | struct packet_info { |
44 | enum drbd_packet cmd; |
45 | unsigned int size; |
46 | unsigned int vnr; |
47 | void *data; |
48 | }; |
49 | |
50 | enum finish_epoch { |
51 | FE_STILL_LIVE, |
52 | FE_DESTROYED, |
53 | FE_RECYCLED, |
54 | }; |
55 | |
56 | static int drbd_do_features(struct drbd_connection *connection); |
57 | static int drbd_do_auth(struct drbd_connection *connection); |
58 | static int drbd_disconnected(struct drbd_peer_device *); |
59 | static void conn_wait_active_ee_empty(struct drbd_connection *connection); |
60 | static enum finish_epoch drbd_may_finish_epoch(struct drbd_connection *, struct drbd_epoch *, enum epoch_event); |
61 | static int e_end_block(struct drbd_work *, int); |
62 | |
63 | |
64 | #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) |
65 | |
66 | /* |
67 | * some helper functions to deal with single linked page lists, |
68 | * page->private being our "next" pointer. |
69 | */ |
70 | |
71 | /* If at least n pages are linked at head, get n pages off. |
72 | * Otherwise, don't modify head, and return NULL. |
73 | * Locking is the responsibility of the caller. |
74 | */ |
75 | static struct page *page_chain_del(struct page **head, int n) |
76 | { |
77 | struct page *page; |
78 | struct page *tmp; |
79 | |
80 | BUG_ON(!n); |
81 | BUG_ON(!head); |
82 | |
83 | page = *head; |
84 | |
85 | if (!page) |
86 | return NULL; |
87 | |
88 | while (page) { |
89 | tmp = page_chain_next(page); |
90 | if (--n == 0) |
91 | break; /* found sufficient pages */ |
92 | if (tmp == NULL) |
93 | /* insufficient pages, don't use any of them. */ |
94 | return NULL; |
95 | page = tmp; |
96 | } |
97 | |
98 | /* add end of list marker for the returned list */ |
99 | set_page_private(page, private: 0); |
100 | /* actual return value, and adjustment of head */ |
101 | page = *head; |
102 | *head = tmp; |
103 | return page; |
104 | } |
105 | |
106 | /* may be used outside of locks to find the tail of a (usually short) |
107 | * "private" page chain, before adding it back to a global chain head |
108 | * with page_chain_add() under a spinlock. */ |
109 | static struct page *page_chain_tail(struct page *page, int *len) |
110 | { |
111 | struct page *tmp; |
112 | int i = 1; |
113 | while ((tmp = page_chain_next(page))) { |
114 | ++i; |
115 | page = tmp; |
116 | } |
117 | if (len) |
118 | *len = i; |
119 | return page; |
120 | } |
121 | |
122 | static int page_chain_free(struct page *page) |
123 | { |
124 | struct page *tmp; |
125 | int i = 0; |
126 | page_chain_for_each_safe(page, tmp) { |
127 | put_page(page); |
128 | ++i; |
129 | } |
130 | return i; |
131 | } |
132 | |
133 | static void page_chain_add(struct page **head, |
134 | struct page *chain_first, struct page *chain_last) |
135 | { |
136 | #if 1 |
137 | struct page *tmp; |
138 | tmp = page_chain_tail(page: chain_first, NULL); |
139 | BUG_ON(tmp != chain_last); |
140 | #endif |
141 | |
142 | /* add chain to head */ |
143 | set_page_private(page: chain_last, private: (unsigned long)*head); |
144 | *head = chain_first; |
145 | } |
146 | |
147 | static struct page *__drbd_alloc_pages(struct drbd_device *device, |
148 | unsigned int number) |
149 | { |
150 | struct page *page = NULL; |
151 | struct page *tmp = NULL; |
152 | unsigned int i = 0; |
153 | |
154 | /* Yes, testing drbd_pp_vacant outside the lock is racy. |
155 | * So what. It saves a spin_lock. */ |
156 | if (drbd_pp_vacant >= number) { |
157 | spin_lock(lock: &drbd_pp_lock); |
158 | page = page_chain_del(head: &drbd_pp_pool, n: number); |
159 | if (page) |
160 | drbd_pp_vacant -= number; |
161 | spin_unlock(lock: &drbd_pp_lock); |
162 | if (page) |
163 | return page; |
164 | } |
165 | |
166 | /* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD |
167 | * "criss-cross" setup, that might cause write-out on some other DRBD, |
168 | * which in turn might block on the other node at this very place. */ |
169 | for (i = 0; i < number; i++) { |
170 | tmp = alloc_page(GFP_TRY); |
171 | if (!tmp) |
172 | break; |
173 | set_page_private(page: tmp, private: (unsigned long)page); |
174 | page = tmp; |
175 | } |
176 | |
177 | if (i == number) |
178 | return page; |
179 | |
180 | /* Not enough pages immediately available this time. |
181 | * No need to jump around here, drbd_alloc_pages will retry this |
182 | * function "soon". */ |
183 | if (page) { |
184 | tmp = page_chain_tail(page, NULL); |
185 | spin_lock(lock: &drbd_pp_lock); |
186 | page_chain_add(head: &drbd_pp_pool, chain_first: page, chain_last: tmp); |
187 | drbd_pp_vacant += i; |
188 | spin_unlock(lock: &drbd_pp_lock); |
189 | } |
190 | return NULL; |
191 | } |
192 | |
193 | static void reclaim_finished_net_peer_reqs(struct drbd_device *device, |
194 | struct list_head *to_be_freed) |
195 | { |
196 | struct drbd_peer_request *peer_req, *tmp; |
197 | |
198 | /* The EEs are always appended to the end of the list. Since |
199 | they are sent in order over the wire, they have to finish |
200 | in order. As soon as we see the first not finished we can |
201 | stop to examine the list... */ |
202 | |
203 | list_for_each_entry_safe(peer_req, tmp, &device->net_ee, w.list) { |
204 | if (drbd_peer_req_has_active_page(peer_req)) |
205 | break; |
206 | list_move(list: &peer_req->w.list, head: to_be_freed); |
207 | } |
208 | } |
209 | |
210 | static void drbd_reclaim_net_peer_reqs(struct drbd_device *device) |
211 | { |
212 | LIST_HEAD(reclaimed); |
213 | struct drbd_peer_request *peer_req, *t; |
214 | |
215 | spin_lock_irq(lock: &device->resource->req_lock); |
216 | reclaim_finished_net_peer_reqs(device, to_be_freed: &reclaimed); |
217 | spin_unlock_irq(lock: &device->resource->req_lock); |
218 | list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) |
219 | drbd_free_net_peer_req(device, peer_req); |
220 | } |
221 | |
222 | static void conn_reclaim_net_peer_reqs(struct drbd_connection *connection) |
223 | { |
224 | struct drbd_peer_device *peer_device; |
225 | int vnr; |
226 | |
227 | rcu_read_lock(); |
228 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
229 | struct drbd_device *device = peer_device->device; |
230 | if (!atomic_read(v: &device->pp_in_use_by_net)) |
231 | continue; |
232 | |
233 | kref_get(kref: &device->kref); |
234 | rcu_read_unlock(); |
235 | drbd_reclaim_net_peer_reqs(device); |
236 | kref_put(kref: &device->kref, release: drbd_destroy_device); |
237 | rcu_read_lock(); |
238 | } |
239 | rcu_read_unlock(); |
240 | } |
241 | |
242 | /** |
243 | * drbd_alloc_pages() - Returns @number pages, retries forever (or until signalled) |
244 | * @peer_device: DRBD device. |
245 | * @number: number of pages requested |
246 | * @retry: whether to retry, if not enough pages are available right now |
247 | * |
248 | * Tries to allocate number pages, first from our own page pool, then from |
249 | * the kernel. |
250 | * Possibly retry until DRBD frees sufficient pages somewhere else. |
251 | * |
252 | * If this allocation would exceed the max_buffers setting, we throttle |
253 | * allocation (schedule_timeout) to give the system some room to breathe. |
254 | * |
255 | * We do not use max-buffers as hard limit, because it could lead to |
256 | * congestion and further to a distributed deadlock during online-verify or |
257 | * (checksum based) resync, if the max-buffers, socket buffer sizes and |
258 | * resync-rate settings are mis-configured. |
259 | * |
260 | * Returns a page chain linked via page->private. |
261 | */ |
262 | struct page *drbd_alloc_pages(struct drbd_peer_device *peer_device, unsigned int number, |
263 | bool retry) |
264 | { |
265 | struct drbd_device *device = peer_device->device; |
266 | struct page *page = NULL; |
267 | struct net_conf *nc; |
268 | DEFINE_WAIT(wait); |
269 | unsigned int mxb; |
270 | |
271 | rcu_read_lock(); |
272 | nc = rcu_dereference(peer_device->connection->net_conf); |
273 | mxb = nc ? nc->max_buffers : 1000000; |
274 | rcu_read_unlock(); |
275 | |
276 | if (atomic_read(v: &device->pp_in_use) < mxb) |
277 | page = __drbd_alloc_pages(device, number); |
278 | |
279 | /* Try to keep the fast path fast, but occasionally we need |
280 | * to reclaim the pages we lended to the network stack. */ |
281 | if (page && atomic_read(v: &device->pp_in_use_by_net) > 512) |
282 | drbd_reclaim_net_peer_reqs(device); |
283 | |
284 | while (page == NULL) { |
285 | prepare_to_wait(wq_head: &drbd_pp_wait, wq_entry: &wait, TASK_INTERRUPTIBLE); |
286 | |
287 | drbd_reclaim_net_peer_reqs(device); |
288 | |
289 | if (atomic_read(v: &device->pp_in_use) < mxb) { |
290 | page = __drbd_alloc_pages(device, number); |
291 | if (page) |
292 | break; |
293 | } |
294 | |
295 | if (!retry) |
296 | break; |
297 | |
298 | if (signal_pending(current)) { |
299 | drbd_warn(device, "drbd_alloc_pages interrupted!\n" ); |
300 | break; |
301 | } |
302 | |
303 | if (schedule_timeout(HZ/10) == 0) |
304 | mxb = UINT_MAX; |
305 | } |
306 | finish_wait(wq_head: &drbd_pp_wait, wq_entry: &wait); |
307 | |
308 | if (page) |
309 | atomic_add(i: number, v: &device->pp_in_use); |
310 | return page; |
311 | } |
312 | |
313 | /* Must not be used from irq, as that may deadlock: see drbd_alloc_pages. |
314 | * Is also used from inside an other spin_lock_irq(&resource->req_lock); |
315 | * Either links the page chain back to the global pool, |
316 | * or returns all pages to the system. */ |
317 | static void drbd_free_pages(struct drbd_device *device, struct page *page, int is_net) |
318 | { |
319 | atomic_t *a = is_net ? &device->pp_in_use_by_net : &device->pp_in_use; |
320 | int i; |
321 | |
322 | if (page == NULL) |
323 | return; |
324 | |
325 | if (drbd_pp_vacant > (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * drbd_minor_count) |
326 | i = page_chain_free(page); |
327 | else { |
328 | struct page *tmp; |
329 | tmp = page_chain_tail(page, len: &i); |
330 | spin_lock(lock: &drbd_pp_lock); |
331 | page_chain_add(head: &drbd_pp_pool, chain_first: page, chain_last: tmp); |
332 | drbd_pp_vacant += i; |
333 | spin_unlock(lock: &drbd_pp_lock); |
334 | } |
335 | i = atomic_sub_return(i, v: a); |
336 | if (i < 0) |
337 | drbd_warn(device, "ASSERTION FAILED: %s: %d < 0\n" , |
338 | is_net ? "pp_in_use_by_net" : "pp_in_use" , i); |
339 | wake_up(&drbd_pp_wait); |
340 | } |
341 | |
342 | /* |
343 | You need to hold the req_lock: |
344 | _drbd_wait_ee_list_empty() |
345 | |
346 | You must not have the req_lock: |
347 | drbd_free_peer_req() |
348 | drbd_alloc_peer_req() |
349 | drbd_free_peer_reqs() |
350 | drbd_ee_fix_bhs() |
351 | drbd_finish_peer_reqs() |
352 | drbd_clear_done_ee() |
353 | drbd_wait_ee_list_empty() |
354 | */ |
355 | |
356 | /* normal: payload_size == request size (bi_size) |
357 | * w_same: payload_size == logical_block_size |
358 | * trim: payload_size == 0 */ |
359 | struct drbd_peer_request * |
360 | drbd_alloc_peer_req(struct drbd_peer_device *peer_device, u64 id, sector_t sector, |
361 | unsigned int request_size, unsigned int payload_size, gfp_t gfp_mask) __must_hold(local) |
362 | { |
363 | struct drbd_device *device = peer_device->device; |
364 | struct drbd_peer_request *peer_req; |
365 | struct page *page = NULL; |
366 | unsigned int nr_pages = PFN_UP(payload_size); |
367 | |
368 | if (drbd_insert_fault(device, type: DRBD_FAULT_AL_EE)) |
369 | return NULL; |
370 | |
371 | peer_req = mempool_alloc(pool: &drbd_ee_mempool, gfp_mask: gfp_mask & ~__GFP_HIGHMEM); |
372 | if (!peer_req) { |
373 | if (!(gfp_mask & __GFP_NOWARN)) |
374 | drbd_err(device, "%s: allocation failed\n" , __func__); |
375 | return NULL; |
376 | } |
377 | |
378 | if (nr_pages) { |
379 | page = drbd_alloc_pages(peer_device, number: nr_pages, |
380 | retry: gfpflags_allow_blocking(gfp_flags: gfp_mask)); |
381 | if (!page) |
382 | goto fail; |
383 | } |
384 | |
385 | memset(peer_req, 0, sizeof(*peer_req)); |
386 | INIT_LIST_HEAD(list: &peer_req->w.list); |
387 | drbd_clear_interval(i: &peer_req->i); |
388 | peer_req->i.size = request_size; |
389 | peer_req->i.sector = sector; |
390 | peer_req->submit_jif = jiffies; |
391 | peer_req->peer_device = peer_device; |
392 | peer_req->pages = page; |
393 | /* |
394 | * The block_id is opaque to the receiver. It is not endianness |
395 | * converted, and sent back to the sender unchanged. |
396 | */ |
397 | peer_req->block_id = id; |
398 | |
399 | return peer_req; |
400 | |
401 | fail: |
402 | mempool_free(element: peer_req, pool: &drbd_ee_mempool); |
403 | return NULL; |
404 | } |
405 | |
406 | void __drbd_free_peer_req(struct drbd_device *device, struct drbd_peer_request *peer_req, |
407 | int is_net) |
408 | { |
409 | might_sleep(); |
410 | if (peer_req->flags & EE_HAS_DIGEST) |
411 | kfree(objp: peer_req->digest); |
412 | drbd_free_pages(device, page: peer_req->pages, is_net); |
413 | D_ASSERT(device, atomic_read(&peer_req->pending_bios) == 0); |
414 | D_ASSERT(device, drbd_interval_empty(&peer_req->i)); |
415 | if (!expect(device, !(peer_req->flags & EE_CALL_AL_COMPLETE_IO))) { |
416 | peer_req->flags &= ~EE_CALL_AL_COMPLETE_IO; |
417 | drbd_al_complete_io(device, i: &peer_req->i); |
418 | } |
419 | mempool_free(element: peer_req, pool: &drbd_ee_mempool); |
420 | } |
421 | |
422 | int drbd_free_peer_reqs(struct drbd_device *device, struct list_head *list) |
423 | { |
424 | LIST_HEAD(work_list); |
425 | struct drbd_peer_request *peer_req, *t; |
426 | int count = 0; |
427 | int is_net = list == &device->net_ee; |
428 | |
429 | spin_lock_irq(lock: &device->resource->req_lock); |
430 | list_splice_init(list, head: &work_list); |
431 | spin_unlock_irq(lock: &device->resource->req_lock); |
432 | |
433 | list_for_each_entry_safe(peer_req, t, &work_list, w.list) { |
434 | __drbd_free_peer_req(device, peer_req, is_net); |
435 | count++; |
436 | } |
437 | return count; |
438 | } |
439 | |
440 | /* |
441 | * See also comments in _req_mod(,BARRIER_ACKED) and receive_Barrier. |
442 | */ |
443 | static int drbd_finish_peer_reqs(struct drbd_device *device) |
444 | { |
445 | LIST_HEAD(work_list); |
446 | LIST_HEAD(reclaimed); |
447 | struct drbd_peer_request *peer_req, *t; |
448 | int err = 0; |
449 | |
450 | spin_lock_irq(lock: &device->resource->req_lock); |
451 | reclaim_finished_net_peer_reqs(device, to_be_freed: &reclaimed); |
452 | list_splice_init(list: &device->done_ee, head: &work_list); |
453 | spin_unlock_irq(lock: &device->resource->req_lock); |
454 | |
455 | list_for_each_entry_safe(peer_req, t, &reclaimed, w.list) |
456 | drbd_free_net_peer_req(device, peer_req); |
457 | |
458 | /* possible callbacks here: |
459 | * e_end_block, and e_end_resync_block, e_send_superseded. |
460 | * all ignore the last argument. |
461 | */ |
462 | list_for_each_entry_safe(peer_req, t, &work_list, w.list) { |
463 | int err2; |
464 | |
465 | /* list_del not necessary, next/prev members not touched */ |
466 | err2 = peer_req->w.cb(&peer_req->w, !!err); |
467 | if (!err) |
468 | err = err2; |
469 | drbd_free_peer_req(device, peer_req); |
470 | } |
471 | wake_up(&device->ee_wait); |
472 | |
473 | return err; |
474 | } |
475 | |
476 | static void _drbd_wait_ee_list_empty(struct drbd_device *device, |
477 | struct list_head *head) |
478 | { |
479 | DEFINE_WAIT(wait); |
480 | |
481 | /* avoids spin_lock/unlock |
482 | * and calling prepare_to_wait in the fast path */ |
483 | while (!list_empty(head)) { |
484 | prepare_to_wait(wq_head: &device->ee_wait, wq_entry: &wait, TASK_UNINTERRUPTIBLE); |
485 | spin_unlock_irq(lock: &device->resource->req_lock); |
486 | io_schedule(); |
487 | finish_wait(wq_head: &device->ee_wait, wq_entry: &wait); |
488 | spin_lock_irq(lock: &device->resource->req_lock); |
489 | } |
490 | } |
491 | |
492 | static void drbd_wait_ee_list_empty(struct drbd_device *device, |
493 | struct list_head *head) |
494 | { |
495 | spin_lock_irq(lock: &device->resource->req_lock); |
496 | _drbd_wait_ee_list_empty(device, head); |
497 | spin_unlock_irq(lock: &device->resource->req_lock); |
498 | } |
499 | |
500 | static int drbd_recv_short(struct socket *sock, void *buf, size_t size, int flags) |
501 | { |
502 | struct kvec iov = { |
503 | .iov_base = buf, |
504 | .iov_len = size, |
505 | }; |
506 | struct msghdr msg = { |
507 | .msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL) |
508 | }; |
509 | iov_iter_kvec(i: &msg.msg_iter, ITER_DEST, kvec: &iov, nr_segs: 1, count: size); |
510 | return sock_recvmsg(sock, msg: &msg, flags: msg.msg_flags); |
511 | } |
512 | |
513 | static int drbd_recv(struct drbd_connection *connection, void *buf, size_t size) |
514 | { |
515 | int rv; |
516 | |
517 | rv = drbd_recv_short(sock: connection->data.socket, buf, size, flags: 0); |
518 | |
519 | if (rv < 0) { |
520 | if (rv == -ECONNRESET) |
521 | drbd_info(connection, "sock was reset by peer\n" ); |
522 | else if (rv != -ERESTARTSYS) |
523 | drbd_err(connection, "sock_recvmsg returned %d\n" , rv); |
524 | } else if (rv == 0) { |
525 | if (test_bit(DISCONNECT_SENT, &connection->flags)) { |
526 | long t; |
527 | rcu_read_lock(); |
528 | t = rcu_dereference(connection->net_conf)->ping_timeo * HZ/10; |
529 | rcu_read_unlock(); |
530 | |
531 | t = wait_event_timeout(connection->ping_wait, connection->cstate < C_WF_REPORT_PARAMS, t); |
532 | |
533 | if (t) |
534 | goto out; |
535 | } |
536 | drbd_info(connection, "sock was shut down by peer\n" ); |
537 | } |
538 | |
539 | if (rv != size) |
540 | conn_request_state(connection, NS(conn, C_BROKEN_PIPE), flags: CS_HARD); |
541 | |
542 | out: |
543 | return rv; |
544 | } |
545 | |
546 | static int drbd_recv_all(struct drbd_connection *connection, void *buf, size_t size) |
547 | { |
548 | int err; |
549 | |
550 | err = drbd_recv(connection, buf, size); |
551 | if (err != size) { |
552 | if (err >= 0) |
553 | err = -EIO; |
554 | } else |
555 | err = 0; |
556 | return err; |
557 | } |
558 | |
559 | static int drbd_recv_all_warn(struct drbd_connection *connection, void *buf, size_t size) |
560 | { |
561 | int err; |
562 | |
563 | err = drbd_recv_all(connection, buf, size); |
564 | if (err && !signal_pending(current)) |
565 | drbd_warn(connection, "short read (expected size %d)\n" , (int)size); |
566 | return err; |
567 | } |
568 | |
569 | /* quoting tcp(7): |
570 | * On individual connections, the socket buffer size must be set prior to the |
571 | * listen(2) or connect(2) calls in order to have it take effect. |
572 | * This is our wrapper to do so. |
573 | */ |
574 | static void drbd_setbufsize(struct socket *sock, unsigned int snd, |
575 | unsigned int rcv) |
576 | { |
577 | /* open coded SO_SNDBUF, SO_RCVBUF */ |
578 | if (snd) { |
579 | sock->sk->sk_sndbuf = snd; |
580 | sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
581 | } |
582 | if (rcv) { |
583 | sock->sk->sk_rcvbuf = rcv; |
584 | sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
585 | } |
586 | } |
587 | |
588 | static struct socket *drbd_try_connect(struct drbd_connection *connection) |
589 | { |
590 | const char *what; |
591 | struct socket *sock; |
592 | struct sockaddr_in6 src_in6; |
593 | struct sockaddr_in6 peer_in6; |
594 | struct net_conf *nc; |
595 | int err, peer_addr_len, my_addr_len; |
596 | int sndbuf_size, rcvbuf_size, connect_int; |
597 | int disconnect_on_error = 1; |
598 | |
599 | rcu_read_lock(); |
600 | nc = rcu_dereference(connection->net_conf); |
601 | if (!nc) { |
602 | rcu_read_unlock(); |
603 | return NULL; |
604 | } |
605 | sndbuf_size = nc->sndbuf_size; |
606 | rcvbuf_size = nc->rcvbuf_size; |
607 | connect_int = nc->connect_int; |
608 | rcu_read_unlock(); |
609 | |
610 | my_addr_len = min_t(int, connection->my_addr_len, sizeof(src_in6)); |
611 | memcpy(&src_in6, &connection->my_addr, my_addr_len); |
612 | |
613 | if (((struct sockaddr *)&connection->my_addr)->sa_family == AF_INET6) |
614 | src_in6.sin6_port = 0; |
615 | else |
616 | ((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */ |
617 | |
618 | peer_addr_len = min_t(int, connection->peer_addr_len, sizeof(src_in6)); |
619 | memcpy(&peer_in6, &connection->peer_addr, peer_addr_len); |
620 | |
621 | what = "sock_create_kern" ; |
622 | err = sock_create_kern(net: &init_net, family: ((struct sockaddr *)&src_in6)->sa_family, |
623 | type: SOCK_STREAM, IPPROTO_TCP, res: &sock); |
624 | if (err < 0) { |
625 | sock = NULL; |
626 | goto out; |
627 | } |
628 | |
629 | sock->sk->sk_rcvtimeo = |
630 | sock->sk->sk_sndtimeo = connect_int * HZ; |
631 | drbd_setbufsize(sock, snd: sndbuf_size, rcv: rcvbuf_size); |
632 | |
633 | /* explicitly bind to the configured IP as source IP |
634 | * for the outgoing connections. |
635 | * This is needed for multihomed hosts and to be |
636 | * able to use lo: interfaces for drbd. |
637 | * Make sure to use 0 as port number, so linux selects |
638 | * a free one dynamically. |
639 | */ |
640 | what = "bind before connect" ; |
641 | err = sock->ops->bind(sock, (struct sockaddr *) &src_in6, my_addr_len); |
642 | if (err < 0) |
643 | goto out; |
644 | |
645 | /* connect may fail, peer not yet available. |
646 | * stay C_WF_CONNECTION, don't go Disconnecting! */ |
647 | disconnect_on_error = 0; |
648 | what = "connect" ; |
649 | err = sock->ops->connect(sock, (struct sockaddr *) &peer_in6, peer_addr_len, 0); |
650 | |
651 | out: |
652 | if (err < 0) { |
653 | if (sock) { |
654 | sock_release(sock); |
655 | sock = NULL; |
656 | } |
657 | switch (-err) { |
658 | /* timeout, busy, signal pending */ |
659 | case ETIMEDOUT: case EAGAIN: case EINPROGRESS: |
660 | case EINTR: case ERESTARTSYS: |
661 | /* peer not (yet) available, network problem */ |
662 | case ECONNREFUSED: case ENETUNREACH: |
663 | case EHOSTDOWN: case EHOSTUNREACH: |
664 | disconnect_on_error = 0; |
665 | break; |
666 | default: |
667 | drbd_err(connection, "%s failed, err = %d\n" , what, err); |
668 | } |
669 | if (disconnect_on_error) |
670 | conn_request_state(connection, NS(conn, C_DISCONNECTING), flags: CS_HARD); |
671 | } |
672 | |
673 | return sock; |
674 | } |
675 | |
676 | struct accept_wait_data { |
677 | struct drbd_connection *connection; |
678 | struct socket *s_listen; |
679 | struct completion door_bell; |
680 | void (*original_sk_state_change)(struct sock *sk); |
681 | |
682 | }; |
683 | |
684 | static void drbd_incoming_connection(struct sock *sk) |
685 | { |
686 | struct accept_wait_data *ad = sk->sk_user_data; |
687 | void (*state_change)(struct sock *sk); |
688 | |
689 | state_change = ad->original_sk_state_change; |
690 | if (sk->sk_state == TCP_ESTABLISHED) |
691 | complete(&ad->door_bell); |
692 | state_change(sk); |
693 | } |
694 | |
695 | static int prepare_listen_socket(struct drbd_connection *connection, struct accept_wait_data *ad) |
696 | { |
697 | int err, sndbuf_size, rcvbuf_size, my_addr_len; |
698 | struct sockaddr_in6 my_addr; |
699 | struct socket *s_listen; |
700 | struct net_conf *nc; |
701 | const char *what; |
702 | |
703 | rcu_read_lock(); |
704 | nc = rcu_dereference(connection->net_conf); |
705 | if (!nc) { |
706 | rcu_read_unlock(); |
707 | return -EIO; |
708 | } |
709 | sndbuf_size = nc->sndbuf_size; |
710 | rcvbuf_size = nc->rcvbuf_size; |
711 | rcu_read_unlock(); |
712 | |
713 | my_addr_len = min_t(int, connection->my_addr_len, sizeof(struct sockaddr_in6)); |
714 | memcpy(&my_addr, &connection->my_addr, my_addr_len); |
715 | |
716 | what = "sock_create_kern" ; |
717 | err = sock_create_kern(net: &init_net, family: ((struct sockaddr *)&my_addr)->sa_family, |
718 | type: SOCK_STREAM, IPPROTO_TCP, res: &s_listen); |
719 | if (err) { |
720 | s_listen = NULL; |
721 | goto out; |
722 | } |
723 | |
724 | s_listen->sk->sk_reuse = SK_CAN_REUSE; /* SO_REUSEADDR */ |
725 | drbd_setbufsize(sock: s_listen, snd: sndbuf_size, rcv: rcvbuf_size); |
726 | |
727 | what = "bind before listen" ; |
728 | err = s_listen->ops->bind(s_listen, (struct sockaddr *)&my_addr, my_addr_len); |
729 | if (err < 0) |
730 | goto out; |
731 | |
732 | ad->s_listen = s_listen; |
733 | write_lock_bh(&s_listen->sk->sk_callback_lock); |
734 | ad->original_sk_state_change = s_listen->sk->sk_state_change; |
735 | s_listen->sk->sk_state_change = drbd_incoming_connection; |
736 | s_listen->sk->sk_user_data = ad; |
737 | write_unlock_bh(&s_listen->sk->sk_callback_lock); |
738 | |
739 | what = "listen" ; |
740 | err = s_listen->ops->listen(s_listen, 5); |
741 | if (err < 0) |
742 | goto out; |
743 | |
744 | return 0; |
745 | out: |
746 | if (s_listen) |
747 | sock_release(sock: s_listen); |
748 | if (err < 0) { |
749 | if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { |
750 | drbd_err(connection, "%s failed, err = %d\n" , what, err); |
751 | conn_request_state(connection, NS(conn, C_DISCONNECTING), flags: CS_HARD); |
752 | } |
753 | } |
754 | |
755 | return -EIO; |
756 | } |
757 | |
758 | static void unregister_state_change(struct sock *sk, struct accept_wait_data *ad) |
759 | { |
760 | write_lock_bh(&sk->sk_callback_lock); |
761 | sk->sk_state_change = ad->original_sk_state_change; |
762 | sk->sk_user_data = NULL; |
763 | write_unlock_bh(&sk->sk_callback_lock); |
764 | } |
765 | |
766 | static struct socket *drbd_wait_for_connect(struct drbd_connection *connection, struct accept_wait_data *ad) |
767 | { |
768 | int timeo, connect_int, err = 0; |
769 | struct socket *s_estab = NULL; |
770 | struct net_conf *nc; |
771 | |
772 | rcu_read_lock(); |
773 | nc = rcu_dereference(connection->net_conf); |
774 | if (!nc) { |
775 | rcu_read_unlock(); |
776 | return NULL; |
777 | } |
778 | connect_int = nc->connect_int; |
779 | rcu_read_unlock(); |
780 | |
781 | timeo = connect_int * HZ; |
782 | /* 28.5% random jitter */ |
783 | timeo += get_random_u32_below(ceil: 2) ? timeo / 7 : -timeo / 7; |
784 | |
785 | err = wait_for_completion_interruptible_timeout(x: &ad->door_bell, timeout: timeo); |
786 | if (err <= 0) |
787 | return NULL; |
788 | |
789 | err = kernel_accept(sock: ad->s_listen, newsock: &s_estab, flags: 0); |
790 | if (err < 0) { |
791 | if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) { |
792 | drbd_err(connection, "accept failed, err = %d\n" , err); |
793 | conn_request_state(connection, NS(conn, C_DISCONNECTING), flags: CS_HARD); |
794 | } |
795 | } |
796 | |
797 | if (s_estab) |
798 | unregister_state_change(sk: s_estab->sk, ad); |
799 | |
800 | return s_estab; |
801 | } |
802 | |
803 | static int decode_header(struct drbd_connection *, void *, struct packet_info *); |
804 | |
805 | static int send_first_packet(struct drbd_connection *connection, struct drbd_socket *sock, |
806 | enum drbd_packet cmd) |
807 | { |
808 | if (!conn_prepare_command(connection, sock)) |
809 | return -EIO; |
810 | return conn_send_command(connection, sock, cmd, 0, NULL, 0); |
811 | } |
812 | |
813 | static int receive_first_packet(struct drbd_connection *connection, struct socket *sock) |
814 | { |
815 | unsigned int = drbd_header_size(connection); |
816 | struct packet_info pi; |
817 | struct net_conf *nc; |
818 | int err; |
819 | |
820 | rcu_read_lock(); |
821 | nc = rcu_dereference(connection->net_conf); |
822 | if (!nc) { |
823 | rcu_read_unlock(); |
824 | return -EIO; |
825 | } |
826 | sock->sk->sk_rcvtimeo = nc->ping_timeo * 4 * HZ / 10; |
827 | rcu_read_unlock(); |
828 | |
829 | err = drbd_recv_short(sock, buf: connection->data.rbuf, size: header_size, flags: 0); |
830 | if (err != header_size) { |
831 | if (err >= 0) |
832 | err = -EIO; |
833 | return err; |
834 | } |
835 | err = decode_header(connection, connection->data.rbuf, &pi); |
836 | if (err) |
837 | return err; |
838 | return pi.cmd; |
839 | } |
840 | |
841 | /** |
842 | * drbd_socket_okay() - Free the socket if its connection is not okay |
843 | * @sock: pointer to the pointer to the socket. |
844 | */ |
845 | static bool drbd_socket_okay(struct socket **sock) |
846 | { |
847 | int rr; |
848 | char tb[4]; |
849 | |
850 | if (!*sock) |
851 | return false; |
852 | |
853 | rr = drbd_recv_short(sock: *sock, buf: tb, size: 4, MSG_DONTWAIT | MSG_PEEK); |
854 | |
855 | if (rr > 0 || rr == -EAGAIN) { |
856 | return true; |
857 | } else { |
858 | sock_release(sock: *sock); |
859 | *sock = NULL; |
860 | return false; |
861 | } |
862 | } |
863 | |
864 | static bool connection_established(struct drbd_connection *connection, |
865 | struct socket **sock1, |
866 | struct socket **sock2) |
867 | { |
868 | struct net_conf *nc; |
869 | int timeout; |
870 | bool ok; |
871 | |
872 | if (!*sock1 || !*sock2) |
873 | return false; |
874 | |
875 | rcu_read_lock(); |
876 | nc = rcu_dereference(connection->net_conf); |
877 | timeout = (nc->sock_check_timeo ?: nc->ping_timeo) * HZ / 10; |
878 | rcu_read_unlock(); |
879 | schedule_timeout_interruptible(timeout); |
880 | |
881 | ok = drbd_socket_okay(sock: sock1); |
882 | ok = drbd_socket_okay(sock: sock2) && ok; |
883 | |
884 | return ok; |
885 | } |
886 | |
887 | /* Gets called if a connection is established, or if a new minor gets created |
888 | in a connection */ |
889 | int drbd_connected(struct drbd_peer_device *peer_device) |
890 | { |
891 | struct drbd_device *device = peer_device->device; |
892 | int err; |
893 | |
894 | atomic_set(v: &device->packet_seq, i: 0); |
895 | device->peer_seq = 0; |
896 | |
897 | device->state_mutex = peer_device->connection->agreed_pro_version < 100 ? |
898 | &peer_device->connection->cstate_mutex : |
899 | &device->own_state_mutex; |
900 | |
901 | err = drbd_send_sync_param(peer_device); |
902 | if (!err) |
903 | err = drbd_send_sizes(peer_device, trigger_reply: 0, flags: 0); |
904 | if (!err) |
905 | err = drbd_send_uuids(peer_device); |
906 | if (!err) |
907 | err = drbd_send_current_state(peer_device); |
908 | clear_bit(nr: USE_DEGR_WFC_T, addr: &device->flags); |
909 | clear_bit(nr: RESIZE_PENDING, addr: &device->flags); |
910 | atomic_set(v: &device->ap_in_flight, i: 0); |
911 | mod_timer(timer: &device->request_timer, expires: jiffies + HZ); /* just start it here. */ |
912 | return err; |
913 | } |
914 | |
915 | /* |
916 | * return values: |
917 | * 1 yes, we have a valid connection |
918 | * 0 oops, did not work out, please try again |
919 | * -1 peer talks different language, |
920 | * no point in trying again, please go standalone. |
921 | * -2 We do not have a network config... |
922 | */ |
923 | static int conn_connect(struct drbd_connection *connection) |
924 | { |
925 | struct drbd_socket sock, msock; |
926 | struct drbd_peer_device *peer_device; |
927 | struct net_conf *nc; |
928 | int vnr, timeout, h; |
929 | bool discard_my_data, ok; |
930 | enum drbd_state_rv rv; |
931 | struct accept_wait_data ad = { |
932 | .connection = connection, |
933 | .door_bell = COMPLETION_INITIALIZER_ONSTACK(ad.door_bell), |
934 | }; |
935 | |
936 | clear_bit(nr: DISCONNECT_SENT, addr: &connection->flags); |
937 | if (conn_request_state(connection, NS(conn, C_WF_CONNECTION), flags: CS_VERBOSE) < SS_SUCCESS) |
938 | return -2; |
939 | |
940 | mutex_init(&sock.mutex); |
941 | sock.sbuf = connection->data.sbuf; |
942 | sock.rbuf = connection->data.rbuf; |
943 | sock.socket = NULL; |
944 | mutex_init(&msock.mutex); |
945 | msock.sbuf = connection->meta.sbuf; |
946 | msock.rbuf = connection->meta.rbuf; |
947 | msock.socket = NULL; |
948 | |
949 | /* Assume that the peer only understands protocol 80 until we know better. */ |
950 | connection->agreed_pro_version = 80; |
951 | |
952 | if (prepare_listen_socket(connection, ad: &ad)) |
953 | return 0; |
954 | |
955 | do { |
956 | struct socket *s; |
957 | |
958 | s = drbd_try_connect(connection); |
959 | if (s) { |
960 | if (!sock.socket) { |
961 | sock.socket = s; |
962 | send_first_packet(connection, sock: &sock, cmd: P_INITIAL_DATA); |
963 | } else if (!msock.socket) { |
964 | clear_bit(nr: RESOLVE_CONFLICTS, addr: &connection->flags); |
965 | msock.socket = s; |
966 | send_first_packet(connection, sock: &msock, cmd: P_INITIAL_META); |
967 | } else { |
968 | drbd_err(connection, "Logic error in conn_connect()\n" ); |
969 | goto out_release_sockets; |
970 | } |
971 | } |
972 | |
973 | if (connection_established(connection, sock1: &sock.socket, sock2: &msock.socket)) |
974 | break; |
975 | |
976 | retry: |
977 | s = drbd_wait_for_connect(connection, ad: &ad); |
978 | if (s) { |
979 | int fp = receive_first_packet(connection, sock: s); |
980 | drbd_socket_okay(sock: &sock.socket); |
981 | drbd_socket_okay(sock: &msock.socket); |
982 | switch (fp) { |
983 | case P_INITIAL_DATA: |
984 | if (sock.socket) { |
985 | drbd_warn(connection, "initial packet S crossed\n" ); |
986 | sock_release(sock: sock.socket); |
987 | sock.socket = s; |
988 | goto randomize; |
989 | } |
990 | sock.socket = s; |
991 | break; |
992 | case P_INITIAL_META: |
993 | set_bit(nr: RESOLVE_CONFLICTS, addr: &connection->flags); |
994 | if (msock.socket) { |
995 | drbd_warn(connection, "initial packet M crossed\n" ); |
996 | sock_release(sock: msock.socket); |
997 | msock.socket = s; |
998 | goto randomize; |
999 | } |
1000 | msock.socket = s; |
1001 | break; |
1002 | default: |
1003 | drbd_warn(connection, "Error receiving initial packet\n" ); |
1004 | sock_release(sock: s); |
1005 | randomize: |
1006 | if (get_random_u32_below(ceil: 2)) |
1007 | goto retry; |
1008 | } |
1009 | } |
1010 | |
1011 | if (connection->cstate <= C_DISCONNECTING) |
1012 | goto out_release_sockets; |
1013 | if (signal_pending(current)) { |
1014 | flush_signals(current); |
1015 | smp_rmb(); |
1016 | if (get_t_state(thi: &connection->receiver) == EXITING) |
1017 | goto out_release_sockets; |
1018 | } |
1019 | |
1020 | ok = connection_established(connection, sock1: &sock.socket, sock2: &msock.socket); |
1021 | } while (!ok); |
1022 | |
1023 | if (ad.s_listen) |
1024 | sock_release(sock: ad.s_listen); |
1025 | |
1026 | sock.socket->sk->sk_reuse = SK_CAN_REUSE; /* SO_REUSEADDR */ |
1027 | msock.socket->sk->sk_reuse = SK_CAN_REUSE; /* SO_REUSEADDR */ |
1028 | |
1029 | sock.socket->sk->sk_allocation = GFP_NOIO; |
1030 | msock.socket->sk->sk_allocation = GFP_NOIO; |
1031 | |
1032 | sock.socket->sk->sk_use_task_frag = false; |
1033 | msock.socket->sk->sk_use_task_frag = false; |
1034 | |
1035 | sock.socket->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK; |
1036 | msock.socket->sk->sk_priority = TC_PRIO_INTERACTIVE; |
1037 | |
1038 | /* NOT YET ... |
1039 | * sock.socket->sk->sk_sndtimeo = connection->net_conf->timeout*HZ/10; |
1040 | * sock.socket->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; |
1041 | * first set it to the P_CONNECTION_FEATURES timeout, |
1042 | * which we set to 4x the configured ping_timeout. */ |
1043 | rcu_read_lock(); |
1044 | nc = rcu_dereference(connection->net_conf); |
1045 | |
1046 | sock.socket->sk->sk_sndtimeo = |
1047 | sock.socket->sk->sk_rcvtimeo = nc->ping_timeo*4*HZ/10; |
1048 | |
1049 | msock.socket->sk->sk_rcvtimeo = nc->ping_int*HZ; |
1050 | timeout = nc->timeout * HZ / 10; |
1051 | discard_my_data = nc->discard_my_data; |
1052 | rcu_read_unlock(); |
1053 | |
1054 | msock.socket->sk->sk_sndtimeo = timeout; |
1055 | |
1056 | /* we don't want delays. |
1057 | * we use TCP_CORK where appropriate, though */ |
1058 | tcp_sock_set_nodelay(sk: sock.socket->sk); |
1059 | tcp_sock_set_nodelay(sk: msock.socket->sk); |
1060 | |
1061 | connection->data.socket = sock.socket; |
1062 | connection->meta.socket = msock.socket; |
1063 | connection->last_received = jiffies; |
1064 | |
1065 | h = drbd_do_features(connection); |
1066 | if (h <= 0) |
1067 | return h; |
1068 | |
1069 | if (connection->cram_hmac_tfm) { |
1070 | /* drbd_request_state(device, NS(conn, WFAuth)); */ |
1071 | switch (drbd_do_auth(connection)) { |
1072 | case -1: |
1073 | drbd_err(connection, "Authentication of peer failed\n" ); |
1074 | return -1; |
1075 | case 0: |
1076 | drbd_err(connection, "Authentication of peer failed, trying again.\n" ); |
1077 | return 0; |
1078 | } |
1079 | } |
1080 | |
1081 | connection->data.socket->sk->sk_sndtimeo = timeout; |
1082 | connection->data.socket->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; |
1083 | |
1084 | if (drbd_send_protocol(connection) == -EOPNOTSUPP) |
1085 | return -1; |
1086 | |
1087 | /* Prevent a race between resync-handshake and |
1088 | * being promoted to Primary. |
1089 | * |
1090 | * Grab and release the state mutex, so we know that any current |
1091 | * drbd_set_role() is finished, and any incoming drbd_set_role |
1092 | * will see the STATE_SENT flag, and wait for it to be cleared. |
1093 | */ |
1094 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) |
1095 | mutex_lock(peer_device->device->state_mutex); |
1096 | |
1097 | /* avoid a race with conn_request_state( C_DISCONNECTING ) */ |
1098 | spin_lock_irq(lock: &connection->resource->req_lock); |
1099 | set_bit(nr: STATE_SENT, addr: &connection->flags); |
1100 | spin_unlock_irq(lock: &connection->resource->req_lock); |
1101 | |
1102 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) |
1103 | mutex_unlock(lock: peer_device->device->state_mutex); |
1104 | |
1105 | rcu_read_lock(); |
1106 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
1107 | struct drbd_device *device = peer_device->device; |
1108 | kref_get(kref: &device->kref); |
1109 | rcu_read_unlock(); |
1110 | |
1111 | if (discard_my_data) |
1112 | set_bit(nr: DISCARD_MY_DATA, addr: &device->flags); |
1113 | else |
1114 | clear_bit(nr: DISCARD_MY_DATA, addr: &device->flags); |
1115 | |
1116 | drbd_connected(peer_device); |
1117 | kref_put(kref: &device->kref, release: drbd_destroy_device); |
1118 | rcu_read_lock(); |
1119 | } |
1120 | rcu_read_unlock(); |
1121 | |
1122 | rv = conn_request_state(connection, NS(conn, C_WF_REPORT_PARAMS), flags: CS_VERBOSE); |
1123 | if (rv < SS_SUCCESS || connection->cstate != C_WF_REPORT_PARAMS) { |
1124 | clear_bit(nr: STATE_SENT, addr: &connection->flags); |
1125 | return 0; |
1126 | } |
1127 | |
1128 | drbd_thread_start(thi: &connection->ack_receiver); |
1129 | /* opencoded create_singlethread_workqueue(), |
1130 | * to be able to use format string arguments */ |
1131 | connection->ack_sender = |
1132 | alloc_ordered_workqueue("drbd_as_%s" , WQ_MEM_RECLAIM, connection->resource->name); |
1133 | if (!connection->ack_sender) { |
1134 | drbd_err(connection, "Failed to create workqueue ack_sender\n" ); |
1135 | return 0; |
1136 | } |
1137 | |
1138 | mutex_lock(&connection->resource->conf_update); |
1139 | /* The discard_my_data flag is a single-shot modifier to the next |
1140 | * connection attempt, the handshake of which is now well underway. |
1141 | * No need for rcu style copying of the whole struct |
1142 | * just to clear a single value. */ |
1143 | connection->net_conf->discard_my_data = 0; |
1144 | mutex_unlock(lock: &connection->resource->conf_update); |
1145 | |
1146 | return h; |
1147 | |
1148 | out_release_sockets: |
1149 | if (ad.s_listen) |
1150 | sock_release(sock: ad.s_listen); |
1151 | if (sock.socket) |
1152 | sock_release(sock: sock.socket); |
1153 | if (msock.socket) |
1154 | sock_release(sock: msock.socket); |
1155 | return -1; |
1156 | } |
1157 | |
1158 | static int (struct drbd_connection *connection, void *, struct packet_info *pi) |
1159 | { |
1160 | unsigned int = drbd_header_size(connection); |
1161 | |
1162 | if (header_size == sizeof(struct p_header100) && |
1163 | *(__be32 *)header == cpu_to_be32(DRBD_MAGIC_100)) { |
1164 | struct p_header100 *h = header; |
1165 | if (h->pad != 0) { |
1166 | drbd_err(connection, "Header padding is not zero\n" ); |
1167 | return -EINVAL; |
1168 | } |
1169 | pi->vnr = be16_to_cpu(h->volume); |
1170 | pi->cmd = be16_to_cpu(h->command); |
1171 | pi->size = be32_to_cpu(h->length); |
1172 | } else if (header_size == sizeof(struct p_header95) && |
1173 | *(__be16 *)header == cpu_to_be16(DRBD_MAGIC_BIG)) { |
1174 | struct p_header95 *h = header; |
1175 | pi->cmd = be16_to_cpu(h->command); |
1176 | pi->size = be32_to_cpu(h->length); |
1177 | pi->vnr = 0; |
1178 | } else if (header_size == sizeof(struct p_header80) && |
1179 | *(__be32 *)header == cpu_to_be32(DRBD_MAGIC)) { |
1180 | struct p_header80 *h = header; |
1181 | pi->cmd = be16_to_cpu(h->command); |
1182 | pi->size = be16_to_cpu(h->length); |
1183 | pi->vnr = 0; |
1184 | } else { |
1185 | drbd_err(connection, "Wrong magic value 0x%08x in protocol version %d\n" , |
1186 | be32_to_cpu(*(__be32 *)header), |
1187 | connection->agreed_pro_version); |
1188 | return -EINVAL; |
1189 | } |
1190 | pi->data = header + header_size; |
1191 | return 0; |
1192 | } |
1193 | |
1194 | static void drbd_unplug_all_devices(struct drbd_connection *connection) |
1195 | { |
1196 | if (current->plug == &connection->receiver_plug) { |
1197 | blk_finish_plug(&connection->receiver_plug); |
1198 | blk_start_plug(&connection->receiver_plug); |
1199 | } /* else: maybe just schedule() ?? */ |
1200 | } |
1201 | |
1202 | static int (struct drbd_connection *connection, struct packet_info *pi) |
1203 | { |
1204 | void *buffer = connection->data.rbuf; |
1205 | int err; |
1206 | |
1207 | err = drbd_recv_all_warn(connection, buf: buffer, size: drbd_header_size(connection)); |
1208 | if (err) |
1209 | return err; |
1210 | |
1211 | err = decode_header(connection, header: buffer, pi); |
1212 | connection->last_received = jiffies; |
1213 | |
1214 | return err; |
1215 | } |
1216 | |
1217 | static int (struct drbd_connection *connection, struct packet_info *pi) |
1218 | { |
1219 | void *buffer = connection->data.rbuf; |
1220 | unsigned int size = drbd_header_size(connection); |
1221 | int err; |
1222 | |
1223 | err = drbd_recv_short(sock: connection->data.socket, buf: buffer, size, MSG_NOSIGNAL|MSG_DONTWAIT); |
1224 | if (err != size) { |
1225 | /* If we have nothing in the receive buffer now, to reduce |
1226 | * application latency, try to drain the backend queues as |
1227 | * quickly as possible, and let remote TCP know what we have |
1228 | * received so far. */ |
1229 | if (err == -EAGAIN) { |
1230 | tcp_sock_set_quickack(sk: connection->data.socket->sk, val: 2); |
1231 | drbd_unplug_all_devices(connection); |
1232 | } |
1233 | if (err > 0) { |
1234 | buffer += err; |
1235 | size -= err; |
1236 | } |
1237 | err = drbd_recv_all_warn(connection, buf: buffer, size); |
1238 | if (err) |
1239 | return err; |
1240 | } |
1241 | |
1242 | err = decode_header(connection, header: connection->data.rbuf, pi); |
1243 | connection->last_received = jiffies; |
1244 | |
1245 | return err; |
1246 | } |
1247 | /* This is blkdev_issue_flush, but asynchronous. |
1248 | * We want to submit to all component volumes in parallel, |
1249 | * then wait for all completions. |
1250 | */ |
1251 | struct issue_flush_context { |
1252 | atomic_t pending; |
1253 | int error; |
1254 | struct completion done; |
1255 | }; |
1256 | struct one_flush_context { |
1257 | struct drbd_device *device; |
1258 | struct issue_flush_context *ctx; |
1259 | }; |
1260 | |
1261 | static void one_flush_endio(struct bio *bio) |
1262 | { |
1263 | struct one_flush_context *octx = bio->bi_private; |
1264 | struct drbd_device *device = octx->device; |
1265 | struct issue_flush_context *ctx = octx->ctx; |
1266 | |
1267 | if (bio->bi_status) { |
1268 | ctx->error = blk_status_to_errno(status: bio->bi_status); |
1269 | drbd_info(device, "local disk FLUSH FAILED with status %d\n" , bio->bi_status); |
1270 | } |
1271 | kfree(objp: octx); |
1272 | bio_put(bio); |
1273 | |
1274 | clear_bit(nr: FLUSH_PENDING, addr: &device->flags); |
1275 | put_ldev(device); |
1276 | kref_put(kref: &device->kref, release: drbd_destroy_device); |
1277 | |
1278 | if (atomic_dec_and_test(v: &ctx->pending)) |
1279 | complete(&ctx->done); |
1280 | } |
1281 | |
1282 | static void submit_one_flush(struct drbd_device *device, struct issue_flush_context *ctx) |
1283 | { |
1284 | struct bio *bio = bio_alloc(bdev: device->ldev->backing_bdev, nr_vecs: 0, |
1285 | opf: REQ_OP_WRITE | REQ_PREFLUSH, GFP_NOIO); |
1286 | struct one_flush_context *octx = kmalloc(size: sizeof(*octx), GFP_NOIO); |
1287 | |
1288 | if (!octx) { |
1289 | drbd_warn(device, "Could not allocate a octx, CANNOT ISSUE FLUSH\n" ); |
1290 | /* FIXME: what else can I do now? disconnecting or detaching |
1291 | * really does not help to improve the state of the world, either. |
1292 | */ |
1293 | bio_put(bio); |
1294 | |
1295 | ctx->error = -ENOMEM; |
1296 | put_ldev(device); |
1297 | kref_put(kref: &device->kref, release: drbd_destroy_device); |
1298 | return; |
1299 | } |
1300 | |
1301 | octx->device = device; |
1302 | octx->ctx = ctx; |
1303 | bio->bi_private = octx; |
1304 | bio->bi_end_io = one_flush_endio; |
1305 | |
1306 | device->flush_jif = jiffies; |
1307 | set_bit(nr: FLUSH_PENDING, addr: &device->flags); |
1308 | atomic_inc(v: &ctx->pending); |
1309 | submit_bio(bio); |
1310 | } |
1311 | |
1312 | static void drbd_flush(struct drbd_connection *connection) |
1313 | { |
1314 | if (connection->resource->write_ordering >= WO_BDEV_FLUSH) { |
1315 | struct drbd_peer_device *peer_device; |
1316 | struct issue_flush_context ctx; |
1317 | int vnr; |
1318 | |
1319 | atomic_set(v: &ctx.pending, i: 1); |
1320 | ctx.error = 0; |
1321 | init_completion(x: &ctx.done); |
1322 | |
1323 | rcu_read_lock(); |
1324 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
1325 | struct drbd_device *device = peer_device->device; |
1326 | |
1327 | if (!get_ldev(device)) |
1328 | continue; |
1329 | kref_get(kref: &device->kref); |
1330 | rcu_read_unlock(); |
1331 | |
1332 | submit_one_flush(device, ctx: &ctx); |
1333 | |
1334 | rcu_read_lock(); |
1335 | } |
1336 | rcu_read_unlock(); |
1337 | |
1338 | /* Do we want to add a timeout, |
1339 | * if disk-timeout is set? */ |
1340 | if (!atomic_dec_and_test(v: &ctx.pending)) |
1341 | wait_for_completion(&ctx.done); |
1342 | |
1343 | if (ctx.error) { |
1344 | /* would rather check on EOPNOTSUPP, but that is not reliable. |
1345 | * don't try again for ANY return value != 0 |
1346 | * if (rv == -EOPNOTSUPP) */ |
1347 | /* Any error is already reported by bio_endio callback. */ |
1348 | drbd_bump_write_ordering(resource: connection->resource, NULL, wo: WO_DRAIN_IO); |
1349 | } |
1350 | } |
1351 | } |
1352 | |
1353 | /** |
1354 | * drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it. |
1355 | * @connection: DRBD connection. |
1356 | * @epoch: Epoch object. |
1357 | * @ev: Epoch event. |
1358 | */ |
1359 | static enum finish_epoch drbd_may_finish_epoch(struct drbd_connection *connection, |
1360 | struct drbd_epoch *epoch, |
1361 | enum epoch_event ev) |
1362 | { |
1363 | int epoch_size; |
1364 | struct drbd_epoch *next_epoch; |
1365 | enum finish_epoch rv = FE_STILL_LIVE; |
1366 | |
1367 | spin_lock(lock: &connection->epoch_lock); |
1368 | do { |
1369 | next_epoch = NULL; |
1370 | |
1371 | epoch_size = atomic_read(v: &epoch->epoch_size); |
1372 | |
1373 | switch (ev & ~EV_CLEANUP) { |
1374 | case EV_PUT: |
1375 | atomic_dec(v: &epoch->active); |
1376 | break; |
1377 | case EV_GOT_BARRIER_NR: |
1378 | set_bit(nr: DE_HAVE_BARRIER_NUMBER, addr: &epoch->flags); |
1379 | break; |
1380 | case EV_BECAME_LAST: |
1381 | /* nothing to do*/ |
1382 | break; |
1383 | } |
1384 | |
1385 | if (epoch_size != 0 && |
1386 | atomic_read(v: &epoch->active) == 0 && |
1387 | (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags) || ev & EV_CLEANUP)) { |
1388 | if (!(ev & EV_CLEANUP)) { |
1389 | spin_unlock(lock: &connection->epoch_lock); |
1390 | drbd_send_b_ack(connection: epoch->connection, barrier_nr: epoch->barrier_nr, set_size: epoch_size); |
1391 | spin_lock(lock: &connection->epoch_lock); |
1392 | } |
1393 | #if 0 |
1394 | /* FIXME: dec unacked on connection, once we have |
1395 | * something to count pending connection packets in. */ |
1396 | if (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) |
1397 | dec_unacked(epoch->connection); |
1398 | #endif |
1399 | |
1400 | if (connection->current_epoch != epoch) { |
1401 | next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list); |
1402 | list_del(entry: &epoch->list); |
1403 | ev = EV_BECAME_LAST | (ev & EV_CLEANUP); |
1404 | connection->epochs--; |
1405 | kfree(objp: epoch); |
1406 | |
1407 | if (rv == FE_STILL_LIVE) |
1408 | rv = FE_DESTROYED; |
1409 | } else { |
1410 | epoch->flags = 0; |
1411 | atomic_set(v: &epoch->epoch_size, i: 0); |
1412 | /* atomic_set(&epoch->active, 0); is already zero */ |
1413 | if (rv == FE_STILL_LIVE) |
1414 | rv = FE_RECYCLED; |
1415 | } |
1416 | } |
1417 | |
1418 | if (!next_epoch) |
1419 | break; |
1420 | |
1421 | epoch = next_epoch; |
1422 | } while (1); |
1423 | |
1424 | spin_unlock(lock: &connection->epoch_lock); |
1425 | |
1426 | return rv; |
1427 | } |
1428 | |
1429 | static enum write_ordering_e |
1430 | max_allowed_wo(struct drbd_backing_dev *bdev, enum write_ordering_e wo) |
1431 | { |
1432 | struct disk_conf *dc; |
1433 | |
1434 | dc = rcu_dereference(bdev->disk_conf); |
1435 | |
1436 | if (wo == WO_BDEV_FLUSH && !dc->disk_flushes) |
1437 | wo = WO_DRAIN_IO; |
1438 | if (wo == WO_DRAIN_IO && !dc->disk_drain) |
1439 | wo = WO_NONE; |
1440 | |
1441 | return wo; |
1442 | } |
1443 | |
1444 | /* |
1445 | * drbd_bump_write_ordering() - Fall back to an other write ordering method |
1446 | * @wo: Write ordering method to try. |
1447 | */ |
1448 | void drbd_bump_write_ordering(struct drbd_resource *resource, struct drbd_backing_dev *bdev, |
1449 | enum write_ordering_e wo) |
1450 | { |
1451 | struct drbd_device *device; |
1452 | enum write_ordering_e pwo; |
1453 | int vnr; |
1454 | static char *write_ordering_str[] = { |
1455 | [WO_NONE] = "none" , |
1456 | [WO_DRAIN_IO] = "drain" , |
1457 | [WO_BDEV_FLUSH] = "flush" , |
1458 | }; |
1459 | |
1460 | pwo = resource->write_ordering; |
1461 | if (wo != WO_BDEV_FLUSH) |
1462 | wo = min(pwo, wo); |
1463 | rcu_read_lock(); |
1464 | idr_for_each_entry(&resource->devices, device, vnr) { |
1465 | if (get_ldev(device)) { |
1466 | wo = max_allowed_wo(bdev: device->ldev, wo); |
1467 | if (device->ldev == bdev) |
1468 | bdev = NULL; |
1469 | put_ldev(device); |
1470 | } |
1471 | } |
1472 | |
1473 | if (bdev) |
1474 | wo = max_allowed_wo(bdev, wo); |
1475 | |
1476 | rcu_read_unlock(); |
1477 | |
1478 | resource->write_ordering = wo; |
1479 | if (pwo != resource->write_ordering || wo == WO_BDEV_FLUSH) |
1480 | drbd_info(resource, "Method to ensure write ordering: %s\n" , write_ordering_str[resource->write_ordering]); |
1481 | } |
1482 | |
1483 | /* |
1484 | * Mapping "discard" to ZEROOUT with UNMAP does not work for us: |
1485 | * Drivers have to "announce" q->limits.max_write_zeroes_sectors, or it |
1486 | * will directly go to fallback mode, submitting normal writes, and |
1487 | * never even try to UNMAP. |
1488 | * |
1489 | * And dm-thin does not do this (yet), mostly because in general it has |
1490 | * to assume that "skip_block_zeroing" is set. See also: |
1491 | * https://www.mail-archive.com/dm-devel%40redhat.com/msg07965.html |
1492 | * https://www.redhat.com/archives/dm-devel/2018-January/msg00271.html |
1493 | * |
1494 | * We *may* ignore the discard-zeroes-data setting, if so configured. |
1495 | * |
1496 | * Assumption is that this "discard_zeroes_data=0" is only because the backend |
1497 | * may ignore partial unaligned discards. |
1498 | * |
1499 | * LVM/DM thin as of at least |
1500 | * LVM version: 2.02.115(2)-RHEL7 (2015-01-28) |
1501 | * Library version: 1.02.93-RHEL7 (2015-01-28) |
1502 | * Driver version: 4.29.0 |
1503 | * still behaves this way. |
1504 | * |
1505 | * For unaligned (wrt. alignment and granularity) or too small discards, |
1506 | * we zero-out the initial (and/or) trailing unaligned partial chunks, |
1507 | * but discard all the aligned full chunks. |
1508 | * |
1509 | * At least for LVM/DM thin, with skip_block_zeroing=false, |
1510 | * the result is effectively "discard_zeroes_data=1". |
1511 | */ |
1512 | /* flags: EE_TRIM|EE_ZEROOUT */ |
1513 | int drbd_issue_discard_or_zero_out(struct drbd_device *device, sector_t start, unsigned int nr_sectors, int flags) |
1514 | { |
1515 | struct block_device *bdev = device->ldev->backing_bdev; |
1516 | sector_t tmp, nr; |
1517 | unsigned int max_discard_sectors, granularity; |
1518 | int alignment; |
1519 | int err = 0; |
1520 | |
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(bdev_discard_granularity(bdev) >> 9, 1U); |
1526 | alignment = (bdev_discard_alignment(bdev) >> 9) % granularity; |
1527 | |
1528 | max_discard_sectors = min(bdev_max_discard_sectors(bdev), (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, sector: start, nr_sects: nr, GFP_NOIO, flags: 0); |
1548 | nr_sectors -= nr; |
1549 | start = tmp; |
1550 | } |
1551 | while (nr_sectors >= max_discard_sectors) { |
1552 | err |= blkdev_issue_discard(bdev, sector: start, nr_sects: max_discard_sectors, |
1553 | GFP_NOIO); |
1554 | nr_sectors -= max_discard_sectors; |
1555 | start += max_discard_sectors; |
1556 | } |
1557 | if (nr_sectors) { |
1558 | /* max_discard_sectors is unsigned int (and a multiple of |
1559 | * granularity, we made sure of that above already); |
1560 | * nr is < max_discard_sectors; |
1561 | * I don't need sector_div here, even though nr is sector_t */ |
1562 | nr = nr_sectors; |
1563 | nr -= (unsigned int)nr % granularity; |
1564 | if (nr) { |
1565 | err |= blkdev_issue_discard(bdev, sector: start, nr_sects: nr, GFP_NOIO); |
1566 | nr_sectors -= nr; |
1567 | start += nr; |
1568 | } |
1569 | } |
1570 | zero_out: |
1571 | if (nr_sectors) { |
1572 | err |= blkdev_issue_zeroout(bdev, sector: start, nr_sects: nr_sectors, GFP_NOIO, |
1573 | flags: (flags & EE_TRIM) ? 0 : BLKDEV_ZERO_NOUNMAP); |
1574 | } |
1575 | return err != 0; |
1576 | } |
1577 | |
1578 | static bool can_do_reliable_discards(struct drbd_device *device) |
1579 | { |
1580 | struct disk_conf *dc; |
1581 | bool can_do; |
1582 | |
1583 | if (!bdev_max_discard_sectors(bdev: device->ldev->backing_bdev)) |
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, start: peer_req->i.sector, |
1603 | nr_sectors: peer_req->i.size >> 9, flags: peer_req->flags & (EE_ZEROOUT|EE_TRIM))) |
1604 | peer_req->flags |= EE_WAS_ERROR; |
1605 | drbd_endio_write_sec_final(peer_req); |
1606 | } |
1607 | |
1608 | static int peer_request_fault_type(struct drbd_peer_request *peer_req) |
1609 | { |
1610 | if (peer_req_op(peer_req) == REQ_OP_READ) { |
1611 | return peer_req->flags & EE_APPLICATION ? |
1612 | DRBD_FAULT_DT_RD : DRBD_FAULT_RS_RD; |
1613 | } else { |
1614 | return peer_req->flags & EE_APPLICATION ? |
1615 | DRBD_FAULT_DT_WR : DRBD_FAULT_RS_WR; |
1616 | } |
1617 | } |
1618 | |
1619 | /** |
1620 | * drbd_submit_peer_request() |
1621 | * @peer_req: peer request |
1622 | * |
1623 | * May spread the pages to multiple bios, |
1624 | * depending on bio_add_page restrictions. |
1625 | * |
1626 | * Returns 0 if all bios have been submitted, |
1627 | * -ENOMEM if we could not allocate enough bios, |
1628 | * -ENOSPC (any better suggestion?) if we have not been able to bio_add_page a |
1629 | * single page to an empty bio (which should never happen and likely indicates |
1630 | * that the lower level IO stack is in some way broken). This has been observed |
1631 | * on certain Xen deployments. |
1632 | */ |
1633 | /* TODO allocate from our own bio_set. */ |
1634 | int drbd_submit_peer_request(struct drbd_peer_request *peer_req) |
1635 | { |
1636 | struct drbd_device *device = peer_req->peer_device->device; |
1637 | struct bio *bios = NULL; |
1638 | struct bio *bio; |
1639 | struct page *page = peer_req->pages; |
1640 | sector_t sector = peer_req->i.sector; |
1641 | unsigned int data_size = peer_req->i.size; |
1642 | unsigned int n_bios = 0; |
1643 | unsigned int nr_pages = PFN_UP(data_size); |
1644 | |
1645 | /* TRIM/DISCARD: for now, always use the helper function |
1646 | * blkdev_issue_zeroout(..., discard=true). |
1647 | * It's synchronous, but it does the right thing wrt. bio splitting. |
1648 | * Correctness first, performance later. Next step is to code an |
1649 | * asynchronous variant of the same. |
1650 | */ |
1651 | if (peer_req->flags & (EE_TRIM | EE_ZEROOUT)) { |
1652 | /* wait for all pending IO completions, before we start |
1653 | * zeroing things out. */ |
1654 | conn_wait_active_ee_empty(connection: peer_req->peer_device->connection); |
1655 | /* add it to the active list now, |
1656 | * so we can find it to present it in debugfs */ |
1657 | peer_req->submit_jif = jiffies; |
1658 | peer_req->flags |= EE_SUBMITTED; |
1659 | |
1660 | /* If this was a resync request from receive_rs_deallocated(), |
1661 | * it is already on the sync_ee list */ |
1662 | if (list_empty(head: &peer_req->w.list)) { |
1663 | spin_lock_irq(lock: &device->resource->req_lock); |
1664 | list_add_tail(new: &peer_req->w.list, head: &device->active_ee); |
1665 | spin_unlock_irq(lock: &device->resource->req_lock); |
1666 | } |
1667 | |
1668 | drbd_issue_peer_discard_or_zero_out(device, peer_req); |
1669 | return 0; |
1670 | } |
1671 | |
1672 | /* In most cases, we will only need one bio. But in case the lower |
1673 | * level restrictions happen to be different at this offset on this |
1674 | * side than those of the sending peer, we may need to submit the |
1675 | * request in more than one bio. |
1676 | * |
1677 | * Plain bio_alloc is good enough here, this is no DRBD internally |
1678 | * generated bio, but a bio allocated on behalf of the peer. |
1679 | */ |
1680 | next_bio: |
1681 | /* _DISCARD, _WRITE_ZEROES handled above. |
1682 | * REQ_OP_FLUSH (empty flush) not expected, |
1683 | * should have been mapped to a "drbd protocol barrier". |
1684 | * REQ_OP_SECURE_ERASE: I don't see how we could ever support that. |
1685 | */ |
1686 | if (!(peer_req_op(peer_req) == REQ_OP_WRITE || |
1687 | peer_req_op(peer_req) == REQ_OP_READ)) { |
1688 | drbd_err(device, "Invalid bio op received: 0x%x\n" , peer_req->opf); |
1689 | return -EINVAL; |
1690 | } |
1691 | |
1692 | bio = bio_alloc(bdev: device->ldev->backing_bdev, nr_vecs: nr_pages, opf: peer_req->opf, GFP_NOIO); |
1693 | /* > peer_req->i.sector, unless this is the first bio */ |
1694 | bio->bi_iter.bi_sector = sector; |
1695 | bio->bi_private = peer_req; |
1696 | bio->bi_end_io = drbd_peer_request_endio; |
1697 | |
1698 | bio->bi_next = bios; |
1699 | bios = bio; |
1700 | ++n_bios; |
1701 | |
1702 | page_chain_for_each(page) { |
1703 | unsigned len = min_t(unsigned, data_size, PAGE_SIZE); |
1704 | if (!bio_add_page(bio, page, len, off: 0)) |
1705 | goto next_bio; |
1706 | data_size -= len; |
1707 | sector += len >> 9; |
1708 | --nr_pages; |
1709 | } |
1710 | D_ASSERT(device, data_size == 0); |
1711 | D_ASSERT(device, page == NULL); |
1712 | |
1713 | atomic_set(v: &peer_req->pending_bios, i: n_bios); |
1714 | /* for debugfs: update timestamp, mark as submitted */ |
1715 | peer_req->submit_jif = jiffies; |
1716 | peer_req->flags |= EE_SUBMITTED; |
1717 | do { |
1718 | bio = bios; |
1719 | bios = bios->bi_next; |
1720 | bio->bi_next = NULL; |
1721 | |
1722 | drbd_submit_bio_noacct(device, fault_type: peer_request_fault_type(peer_req), bio); |
1723 | } while (bios); |
1724 | return 0; |
1725 | } |
1726 | |
1727 | static void drbd_remove_epoch_entry_interval(struct drbd_device *device, |
1728 | struct drbd_peer_request *peer_req) |
1729 | { |
1730 | struct drbd_interval *i = &peer_req->i; |
1731 | |
1732 | drbd_remove_interval(&device->write_requests, i); |
1733 | drbd_clear_interval(i); |
1734 | |
1735 | /* Wake up any processes waiting for this peer request to complete. */ |
1736 | if (i->waiting) |
1737 | wake_up(&device->misc_wait); |
1738 | } |
1739 | |
1740 | static void conn_wait_active_ee_empty(struct drbd_connection *connection) |
1741 | { |
1742 | struct drbd_peer_device *peer_device; |
1743 | int vnr; |
1744 | |
1745 | rcu_read_lock(); |
1746 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
1747 | struct drbd_device *device = peer_device->device; |
1748 | |
1749 | kref_get(kref: &device->kref); |
1750 | rcu_read_unlock(); |
1751 | drbd_wait_ee_list_empty(device, head: &device->active_ee); |
1752 | kref_put(kref: &device->kref, release: drbd_destroy_device); |
1753 | rcu_read_lock(); |
1754 | } |
1755 | rcu_read_unlock(); |
1756 | } |
1757 | |
1758 | static int receive_Barrier(struct drbd_connection *connection, struct packet_info *pi) |
1759 | { |
1760 | int rv; |
1761 | struct p_barrier *p = pi->data; |
1762 | struct drbd_epoch *epoch; |
1763 | |
1764 | /* FIXME these are unacked on connection, |
1765 | * not a specific (peer)device. |
1766 | */ |
1767 | connection->current_epoch->barrier_nr = p->barrier; |
1768 | connection->current_epoch->connection = connection; |
1769 | rv = drbd_may_finish_epoch(connection, epoch: connection->current_epoch, ev: EV_GOT_BARRIER_NR); |
1770 | |
1771 | /* P_BARRIER_ACK may imply that the corresponding extent is dropped from |
1772 | * the activity log, which means it would not be resynced in case the |
1773 | * R_PRIMARY crashes now. |
1774 | * Therefore we must send the barrier_ack after the barrier request was |
1775 | * completed. */ |
1776 | switch (connection->resource->write_ordering) { |
1777 | case WO_NONE: |
1778 | if (rv == FE_RECYCLED) |
1779 | return 0; |
1780 | |
1781 | /* receiver context, in the writeout path of the other node. |
1782 | * avoid potential distributed deadlock */ |
1783 | epoch = kmalloc(size: sizeof(struct drbd_epoch), GFP_NOIO); |
1784 | if (epoch) |
1785 | break; |
1786 | else |
1787 | drbd_warn(connection, "Allocation of an epoch failed, slowing down\n" ); |
1788 | fallthrough; |
1789 | |
1790 | case WO_BDEV_FLUSH: |
1791 | case WO_DRAIN_IO: |
1792 | conn_wait_active_ee_empty(connection); |
1793 | drbd_flush(connection); |
1794 | |
1795 | if (atomic_read(v: &connection->current_epoch->epoch_size)) { |
1796 | epoch = kmalloc(size: sizeof(struct drbd_epoch), GFP_NOIO); |
1797 | if (epoch) |
1798 | break; |
1799 | } |
1800 | |
1801 | return 0; |
1802 | default: |
1803 | drbd_err(connection, "Strangeness in connection->write_ordering %d\n" , |
1804 | connection->resource->write_ordering); |
1805 | return -EIO; |
1806 | } |
1807 | |
1808 | epoch->flags = 0; |
1809 | atomic_set(v: &epoch->epoch_size, i: 0); |
1810 | atomic_set(v: &epoch->active, i: 0); |
1811 | |
1812 | spin_lock(lock: &connection->epoch_lock); |
1813 | if (atomic_read(v: &connection->current_epoch->epoch_size)) { |
1814 | list_add(new: &epoch->list, head: &connection->current_epoch->list); |
1815 | connection->current_epoch = epoch; |
1816 | connection->epochs++; |
1817 | } else { |
1818 | /* The current_epoch got recycled while we allocated this one... */ |
1819 | kfree(objp: epoch); |
1820 | } |
1821 | spin_unlock(lock: &connection->epoch_lock); |
1822 | |
1823 | return 0; |
1824 | } |
1825 | |
1826 | /* quick wrapper in case payload size != request_size (write same) */ |
1827 | static void drbd_csum_ee_size(struct crypto_shash *h, |
1828 | struct drbd_peer_request *r, void *d, |
1829 | unsigned int payload_size) |
1830 | { |
1831 | unsigned int tmp = r->i.size; |
1832 | r->i.size = payload_size; |
1833 | drbd_csum_ee(h, r, d); |
1834 | r->i.size = tmp; |
1835 | } |
1836 | |
1837 | /* used from receive_RSDataReply (recv_resync_read) |
1838 | * and from receive_Data. |
1839 | * data_size: actual payload ("data in") |
1840 | * for normal writes that is bi_size. |
1841 | * for discards, that is zero. |
1842 | * for write same, it is logical_block_size. |
1843 | * both trim and write same have the bi_size ("data len to be affected") |
1844 | * as extra argument in the packet header. |
1845 | */ |
1846 | static struct drbd_peer_request * |
1847 | read_in_block(struct drbd_peer_device *peer_device, u64 id, sector_t sector, |
1848 | struct packet_info *pi) __must_hold(local) |
1849 | { |
1850 | struct drbd_device *device = peer_device->device; |
1851 | const sector_t capacity = get_capacity(disk: device->vdisk); |
1852 | struct drbd_peer_request *peer_req; |
1853 | struct page *page; |
1854 | int digest_size, err; |
1855 | unsigned int data_size = pi->size, ds; |
1856 | void *dig_in = peer_device->connection->int_dig_in; |
1857 | void *dig_vv = peer_device->connection->int_dig_vv; |
1858 | unsigned long *data; |
1859 | struct p_trim *trim = (pi->cmd == P_TRIM) ? pi->data : NULL; |
1860 | struct p_trim *zeroes = (pi->cmd == P_ZEROES) ? pi->data : NULL; |
1861 | |
1862 | digest_size = 0; |
1863 | if (!trim && peer_device->connection->peer_integrity_tfm) { |
1864 | digest_size = crypto_shash_digestsize(tfm: peer_device->connection->peer_integrity_tfm); |
1865 | /* |
1866 | * FIXME: Receive the incoming digest into the receive buffer |
1867 | * here, together with its struct p_data? |
1868 | */ |
1869 | err = drbd_recv_all_warn(connection: peer_device->connection, buf: dig_in, size: digest_size); |
1870 | if (err) |
1871 | return NULL; |
1872 | data_size -= digest_size; |
1873 | } |
1874 | |
1875 | /* assume request_size == data_size, but special case trim. */ |
1876 | ds = data_size; |
1877 | if (trim) { |
1878 | if (!expect(peer_device, data_size == 0)) |
1879 | return NULL; |
1880 | ds = be32_to_cpu(trim->size); |
1881 | } else if (zeroes) { |
1882 | if (!expect(peer_device, data_size == 0)) |
1883 | return NULL; |
1884 | ds = be32_to_cpu(zeroes->size); |
1885 | } |
1886 | |
1887 | if (!expect(peer_device, IS_ALIGNED(ds, 512))) |
1888 | return NULL; |
1889 | if (trim || zeroes) { |
1890 | if (!expect(peer_device, ds <= (DRBD_MAX_BBIO_SECTORS << 9))) |
1891 | return NULL; |
1892 | } else if (!expect(peer_device, ds <= DRBD_MAX_BIO_SIZE)) |
1893 | return NULL; |
1894 | |
1895 | /* even though we trust out peer, |
1896 | * we sometimes have to double check. */ |
1897 | if (sector + (ds>>9) > capacity) { |
1898 | drbd_err(device, "request from peer beyond end of local disk: " |
1899 | "capacity: %llus < sector: %llus + size: %u\n" , |
1900 | (unsigned long long)capacity, |
1901 | (unsigned long long)sector, ds); |
1902 | return NULL; |
1903 | } |
1904 | |
1905 | /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD |
1906 | * "criss-cross" setup, that might cause write-out on some other DRBD, |
1907 | * which in turn might block on the other node at this very place. */ |
1908 | peer_req = drbd_alloc_peer_req(peer_device, id, sector, request_size: ds, payload_size: data_size, GFP_NOIO); |
1909 | if (!peer_req) |
1910 | return NULL; |
1911 | |
1912 | peer_req->flags |= EE_WRITE; |
1913 | if (trim) { |
1914 | peer_req->flags |= EE_TRIM; |
1915 | return peer_req; |
1916 | } |
1917 | if (zeroes) { |
1918 | peer_req->flags |= EE_ZEROOUT; |
1919 | return peer_req; |
1920 | } |
1921 | |
1922 | /* receive payload size bytes into page chain */ |
1923 | ds = data_size; |
1924 | page = peer_req->pages; |
1925 | page_chain_for_each(page) { |
1926 | unsigned len = min_t(int, ds, PAGE_SIZE); |
1927 | data = kmap(page); |
1928 | err = drbd_recv_all_warn(connection: peer_device->connection, buf: data, size: len); |
1929 | if (drbd_insert_fault(device, type: DRBD_FAULT_RECEIVE)) { |
1930 | drbd_err(device, "Fault injection: Corrupting data on receive\n" ); |
1931 | data[0] = data[0] ^ (unsigned long)-1; |
1932 | } |
1933 | kunmap(page); |
1934 | if (err) { |
1935 | drbd_free_peer_req(device, peer_req); |
1936 | return NULL; |
1937 | } |
1938 | ds -= len; |
1939 | } |
1940 | |
1941 | if (digest_size) { |
1942 | drbd_csum_ee_size(h: peer_device->connection->peer_integrity_tfm, r: peer_req, d: dig_vv, payload_size: data_size); |
1943 | if (memcmp(p: dig_in, q: dig_vv, size: digest_size)) { |
1944 | drbd_err(device, "Digest integrity check FAILED: %llus +%u\n" , |
1945 | (unsigned long long)sector, data_size); |
1946 | drbd_free_peer_req(device, peer_req); |
1947 | return NULL; |
1948 | } |
1949 | } |
1950 | device->recv_cnt += data_size >> 9; |
1951 | return peer_req; |
1952 | } |
1953 | |
1954 | /* drbd_drain_block() just takes a data block |
1955 | * out of the socket input buffer, and discards it. |
1956 | */ |
1957 | static int drbd_drain_block(struct drbd_peer_device *peer_device, int data_size) |
1958 | { |
1959 | struct page *page; |
1960 | int err = 0; |
1961 | void *data; |
1962 | |
1963 | if (!data_size) |
1964 | return 0; |
1965 | |
1966 | page = drbd_alloc_pages(peer_device, number: 1, retry: 1); |
1967 | |
1968 | data = kmap(page); |
1969 | while (data_size) { |
1970 | unsigned int len = min_t(int, data_size, PAGE_SIZE); |
1971 | |
1972 | err = drbd_recv_all_warn(connection: peer_device->connection, buf: data, size: len); |
1973 | if (err) |
1974 | break; |
1975 | data_size -= len; |
1976 | } |
1977 | kunmap(page); |
1978 | drbd_free_pages(device: peer_device->device, page, is_net: 0); |
1979 | return err; |
1980 | } |
1981 | |
1982 | static int recv_dless_read(struct drbd_peer_device *peer_device, struct drbd_request *req, |
1983 | sector_t sector, int data_size) |
1984 | { |
1985 | struct bio_vec bvec; |
1986 | struct bvec_iter iter; |
1987 | struct bio *bio; |
1988 | int digest_size, err, expect; |
1989 | void *dig_in = peer_device->connection->int_dig_in; |
1990 | void *dig_vv = peer_device->connection->int_dig_vv; |
1991 | |
1992 | digest_size = 0; |
1993 | if (peer_device->connection->peer_integrity_tfm) { |
1994 | digest_size = crypto_shash_digestsize(tfm: peer_device->connection->peer_integrity_tfm); |
1995 | err = drbd_recv_all_warn(connection: peer_device->connection, buf: dig_in, size: digest_size); |
1996 | if (err) |
1997 | return err; |
1998 | data_size -= digest_size; |
1999 | } |
2000 | |
2001 | /* optimistically update recv_cnt. if receiving fails below, |
2002 | * we disconnect anyways, and counters will be reset. */ |
2003 | peer_device->device->recv_cnt += data_size>>9; |
2004 | |
2005 | bio = req->master_bio; |
2006 | D_ASSERT(peer_device->device, sector == bio->bi_iter.bi_sector); |
2007 | |
2008 | bio_for_each_segment(bvec, bio, iter) { |
2009 | void *mapped = bvec_kmap_local(bvec: &bvec); |
2010 | expect = min_t(int, data_size, bvec.bv_len); |
2011 | err = drbd_recv_all_warn(connection: peer_device->connection, buf: mapped, size: expect); |
2012 | kunmap_local(mapped); |
2013 | if (err) |
2014 | return err; |
2015 | data_size -= expect; |
2016 | } |
2017 | |
2018 | if (digest_size) { |
2019 | drbd_csum_bio(peer_device->connection->peer_integrity_tfm, bio, dig_vv); |
2020 | if (memcmp(p: dig_in, q: dig_vv, size: digest_size)) { |
2021 | drbd_err(peer_device, "Digest integrity check FAILED. Broken NICs?\n" ); |
2022 | return -EINVAL; |
2023 | } |
2024 | } |
2025 | |
2026 | D_ASSERT(peer_device->device, data_size == 0); |
2027 | return 0; |
2028 | } |
2029 | |
2030 | /* |
2031 | * e_end_resync_block() is called in ack_sender context via |
2032 | * drbd_finish_peer_reqs(). |
2033 | */ |
2034 | static int e_end_resync_block(struct drbd_work *w, int unused) |
2035 | { |
2036 | struct drbd_peer_request *peer_req = |
2037 | container_of(w, struct drbd_peer_request, w); |
2038 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
2039 | struct drbd_device *device = peer_device->device; |
2040 | sector_t sector = peer_req->i.sector; |
2041 | int err; |
2042 | |
2043 | D_ASSERT(device, drbd_interval_empty(&peer_req->i)); |
2044 | |
2045 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
2046 | drbd_set_in_sync(peer_device, sector, peer_req->i.size); |
2047 | err = drbd_send_ack(peer_device, P_RS_WRITE_ACK, peer_req); |
2048 | } else { |
2049 | /* Record failure to sync */ |
2050 | drbd_rs_failed_io(peer_device, sector, peer_req->i.size); |
2051 | |
2052 | err = drbd_send_ack(peer_device, P_NEG_ACK, peer_req); |
2053 | } |
2054 | dec_unacked(device); |
2055 | |
2056 | return err; |
2057 | } |
2058 | |
2059 | static int recv_resync_read(struct drbd_peer_device *peer_device, sector_t sector, |
2060 | struct packet_info *pi) __releases(local) |
2061 | { |
2062 | struct drbd_device *device = peer_device->device; |
2063 | struct drbd_peer_request *peer_req; |
2064 | |
2065 | peer_req = read_in_block(peer_device, ID_SYNCER, sector, pi); |
2066 | if (!peer_req) |
2067 | goto fail; |
2068 | |
2069 | dec_rs_pending(peer_device); |
2070 | |
2071 | inc_unacked(device); |
2072 | /* corresponding dec_unacked() in e_end_resync_block() |
2073 | * respective _drbd_clear_done_ee */ |
2074 | |
2075 | peer_req->w.cb = e_end_resync_block; |
2076 | peer_req->opf = REQ_OP_WRITE; |
2077 | peer_req->submit_jif = jiffies; |
2078 | |
2079 | spin_lock_irq(lock: &device->resource->req_lock); |
2080 | list_add_tail(new: &peer_req->w.list, head: &device->sync_ee); |
2081 | spin_unlock_irq(lock: &device->resource->req_lock); |
2082 | |
2083 | atomic_add(i: pi->size >> 9, v: &device->rs_sect_ev); |
2084 | if (drbd_submit_peer_request(peer_req) == 0) |
2085 | return 0; |
2086 | |
2087 | /* don't care for the reason here */ |
2088 | drbd_err(device, "submit failed, triggering re-connect\n" ); |
2089 | spin_lock_irq(lock: &device->resource->req_lock); |
2090 | list_del(entry: &peer_req->w.list); |
2091 | spin_unlock_irq(lock: &device->resource->req_lock); |
2092 | |
2093 | drbd_free_peer_req(device, peer_req); |
2094 | fail: |
2095 | put_ldev(device); |
2096 | return -EIO; |
2097 | } |
2098 | |
2099 | static struct drbd_request * |
2100 | find_request(struct drbd_device *device, struct rb_root *root, u64 id, |
2101 | sector_t sector, bool missing_ok, const char *func) |
2102 | { |
2103 | struct drbd_request *req; |
2104 | |
2105 | /* Request object according to our peer */ |
2106 | req = (struct drbd_request *)(unsigned long)id; |
2107 | if (drbd_contains_interval(root, sector, &req->i) && req->i.local) |
2108 | return req; |
2109 | if (!missing_ok) { |
2110 | drbd_err(device, "%s: failed to find request 0x%lx, sector %llus\n" , func, |
2111 | (unsigned long)id, (unsigned long long)sector); |
2112 | } |
2113 | return NULL; |
2114 | } |
2115 | |
2116 | static int receive_DataReply(struct drbd_connection *connection, struct packet_info *pi) |
2117 | { |
2118 | struct drbd_peer_device *peer_device; |
2119 | struct drbd_device *device; |
2120 | struct drbd_request *req; |
2121 | sector_t sector; |
2122 | int err; |
2123 | struct p_data *p = pi->data; |
2124 | |
2125 | peer_device = conn_peer_device(connection, volume_number: pi->vnr); |
2126 | if (!peer_device) |
2127 | return -EIO; |
2128 | device = peer_device->device; |
2129 | |
2130 | sector = be64_to_cpu(p->sector); |
2131 | |
2132 | spin_lock_irq(lock: &device->resource->req_lock); |
2133 | req = find_request(device, root: &device->read_requests, id: p->block_id, sector, missing_ok: false, func: __func__); |
2134 | spin_unlock_irq(lock: &device->resource->req_lock); |
2135 | if (unlikely(!req)) |
2136 | return -EIO; |
2137 | |
2138 | err = recv_dless_read(peer_device, req, sector, data_size: pi->size); |
2139 | if (!err) |
2140 | req_mod(req, what: DATA_RECEIVED, peer_device); |
2141 | /* else: nothing. handled from drbd_disconnect... |
2142 | * I don't think we may complete this just yet |
2143 | * in case we are "on-disconnect: freeze" */ |
2144 | |
2145 | return err; |
2146 | } |
2147 | |
2148 | static int receive_RSDataReply(struct drbd_connection *connection, struct packet_info *pi) |
2149 | { |
2150 | struct drbd_peer_device *peer_device; |
2151 | struct drbd_device *device; |
2152 | sector_t sector; |
2153 | int err; |
2154 | struct p_data *p = pi->data; |
2155 | |
2156 | peer_device = conn_peer_device(connection, volume_number: pi->vnr); |
2157 | if (!peer_device) |
2158 | return -EIO; |
2159 | device = peer_device->device; |
2160 | |
2161 | sector = be64_to_cpu(p->sector); |
2162 | D_ASSERT(device, p->block_id == ID_SYNCER); |
2163 | |
2164 | if (get_ldev(device)) { |
2165 | /* data is submitted to disk within recv_resync_read. |
2166 | * corresponding put_ldev done below on error, |
2167 | * or in drbd_peer_request_endio. */ |
2168 | err = recv_resync_read(peer_device, sector, pi); |
2169 | } else { |
2170 | if (drbd_ratelimit()) |
2171 | drbd_err(device, "Can not write resync data to local disk.\n" ); |
2172 | |
2173 | err = drbd_drain_block(peer_device, data_size: pi->size); |
2174 | |
2175 | drbd_send_ack_dp(peer_device, P_NEG_ACK, dp: p, data_size: pi->size); |
2176 | } |
2177 | |
2178 | atomic_add(i: pi->size >> 9, v: &device->rs_sect_in); |
2179 | |
2180 | return err; |
2181 | } |
2182 | |
2183 | static void restart_conflicting_writes(struct drbd_device *device, |
2184 | sector_t sector, int size) |
2185 | { |
2186 | struct drbd_interval *i; |
2187 | struct drbd_request *req; |
2188 | |
2189 | drbd_for_each_overlap(i, &device->write_requests, sector, size) { |
2190 | if (!i->local) |
2191 | continue; |
2192 | req = container_of(i, struct drbd_request, i); |
2193 | if (req->rq_state & RQ_LOCAL_PENDING || |
2194 | !(req->rq_state & RQ_POSTPONED)) |
2195 | continue; |
2196 | /* as it is RQ_POSTPONED, this will cause it to |
2197 | * be queued on the retry workqueue. */ |
2198 | __req_mod(req, what: CONFLICT_RESOLVED, NULL, NULL); |
2199 | } |
2200 | } |
2201 | |
2202 | /* |
2203 | * e_end_block() is called in ack_sender context via drbd_finish_peer_reqs(). |
2204 | */ |
2205 | static int e_end_block(struct drbd_work *w, int cancel) |
2206 | { |
2207 | struct drbd_peer_request *peer_req = |
2208 | container_of(w, struct drbd_peer_request, w); |
2209 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
2210 | struct drbd_device *device = peer_device->device; |
2211 | sector_t sector = peer_req->i.sector; |
2212 | int err = 0, pcmd; |
2213 | |
2214 | if (peer_req->flags & EE_SEND_WRITE_ACK) { |
2215 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
2216 | pcmd = (device->state.conn >= C_SYNC_SOURCE && |
2217 | device->state.conn <= C_PAUSED_SYNC_T && |
2218 | peer_req->flags & EE_MAY_SET_IN_SYNC) ? |
2219 | P_RS_WRITE_ACK : P_WRITE_ACK; |
2220 | err = drbd_send_ack(peer_device, pcmd, peer_req); |
2221 | if (pcmd == P_RS_WRITE_ACK) |
2222 | drbd_set_in_sync(peer_device, sector, peer_req->i.size); |
2223 | } else { |
2224 | err = drbd_send_ack(peer_device, P_NEG_ACK, peer_req); |
2225 | /* we expect it to be marked out of sync anyways... |
2226 | * maybe assert this? */ |
2227 | } |
2228 | dec_unacked(device); |
2229 | } |
2230 | |
2231 | /* we delete from the conflict detection hash _after_ we sent out the |
2232 | * P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */ |
2233 | if (peer_req->flags & EE_IN_INTERVAL_TREE) { |
2234 | spin_lock_irq(lock: &device->resource->req_lock); |
2235 | D_ASSERT(device, !drbd_interval_empty(&peer_req->i)); |
2236 | drbd_remove_epoch_entry_interval(device, peer_req); |
2237 | if (peer_req->flags & EE_RESTART_REQUESTS) |
2238 | restart_conflicting_writes(device, sector, size: peer_req->i.size); |
2239 | spin_unlock_irq(lock: &device->resource->req_lock); |
2240 | } else |
2241 | D_ASSERT(device, drbd_interval_empty(&peer_req->i)); |
2242 | |
2243 | drbd_may_finish_epoch(connection: peer_device->connection, epoch: peer_req->epoch, ev: EV_PUT + (cancel ? EV_CLEANUP : 0)); |
2244 | |
2245 | return err; |
2246 | } |
2247 | |
2248 | static int e_send_ack(struct drbd_work *w, enum drbd_packet ack) |
2249 | { |
2250 | struct drbd_peer_request *peer_req = |
2251 | container_of(w, struct drbd_peer_request, w); |
2252 | struct drbd_peer_device *peer_device = peer_req->peer_device; |
2253 | int err; |
2254 | |
2255 | err = drbd_send_ack(peer_device, ack, peer_req); |
2256 | dec_unacked(peer_device->device); |
2257 | |
2258 | return err; |
2259 | } |
2260 | |
2261 | static int e_send_superseded(struct drbd_work *w, int unused) |
2262 | { |
2263 | return e_send_ack(w, ack: P_SUPERSEDED); |
2264 | } |
2265 | |
2266 | static int e_send_retry_write(struct drbd_work *w, int unused) |
2267 | { |
2268 | struct drbd_peer_request *peer_req = |
2269 | container_of(w, struct drbd_peer_request, w); |
2270 | struct drbd_connection *connection = peer_req->peer_device->connection; |
2271 | |
2272 | return e_send_ack(w, ack: connection->agreed_pro_version >= 100 ? |
2273 | P_RETRY_WRITE : P_SUPERSEDED); |
2274 | } |
2275 | |
2276 | static bool seq_greater(u32 a, u32 b) |
2277 | { |
2278 | /* |
2279 | * We assume 32-bit wrap-around here. |
2280 | * For 24-bit wrap-around, we would have to shift: |
2281 | * a <<= 8; b <<= 8; |
2282 | */ |
2283 | return (s32)a - (s32)b > 0; |
2284 | } |
2285 | |
2286 | static u32 seq_max(u32 a, u32 b) |
2287 | { |
2288 | return seq_greater(a, b) ? a : b; |
2289 | } |
2290 | |
2291 | static void update_peer_seq(struct drbd_peer_device *peer_device, unsigned int peer_seq) |
2292 | { |
2293 | struct drbd_device *device = peer_device->device; |
2294 | unsigned int newest_peer_seq; |
2295 | |
2296 | if (test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags)) { |
2297 | spin_lock(lock: &device->peer_seq_lock); |
2298 | newest_peer_seq = seq_max(a: device->peer_seq, b: peer_seq); |
2299 | device->peer_seq = newest_peer_seq; |
2300 | spin_unlock(lock: &device->peer_seq_lock); |
2301 | /* wake up only if we actually changed device->peer_seq */ |
2302 | if (peer_seq == newest_peer_seq) |
2303 | wake_up(&device->seq_wait); |
2304 | } |
2305 | } |
2306 | |
2307 | static inline int overlaps(sector_t s1, int l1, sector_t s2, int l2) |
2308 | { |
2309 | return !((s1 + (l1>>9) <= s2) || (s1 >= s2 + (l2>>9))); |
2310 | } |
2311 | |
2312 | /* maybe change sync_ee into interval trees as well? */ |
2313 | static bool overlapping_resync_write(struct drbd_device *device, struct drbd_peer_request *peer_req) |
2314 | { |
2315 | struct drbd_peer_request *rs_req; |
2316 | bool rv = false; |
2317 | |
2318 | spin_lock_irq(lock: &device->resource->req_lock); |
2319 | list_for_each_entry(rs_req, &device->sync_ee, w.list) { |
2320 | if (overlaps(s1: peer_req->i.sector, l1: peer_req->i.size, |
2321 | s2: rs_req->i.sector, l2: rs_req->i.size)) { |
2322 | rv = true; |
2323 | break; |
2324 | } |
2325 | } |
2326 | spin_unlock_irq(lock: &device->resource->req_lock); |
2327 | |
2328 | return rv; |
2329 | } |
2330 | |
2331 | /* Called from receive_Data. |
2332 | * Synchronize packets on sock with packets on msock. |
2333 | * |
2334 | * This is here so even when a P_DATA packet traveling via sock overtook an Ack |
2335 | * packet traveling on msock, they are still processed in the order they have |
2336 | * been sent. |
2337 | * |
2338 | * Note: we don't care for Ack packets overtaking P_DATA packets. |
2339 | * |
2340 | * In case packet_seq is larger than device->peer_seq number, there are |
2341 | * outstanding packets on the msock. We wait for them to arrive. |
2342 | * In case we are the logically next packet, we update device->peer_seq |
2343 | * ourselves. Correctly handles 32bit wrap around. |
2344 | * |
2345 | * Assume we have a 10 GBit connection, that is about 1<<30 byte per second, |
2346 | * about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds |
2347 | * for the 24bit wrap (historical atomic_t guarantee on some archs), and we have |
2348 | * 1<<9 == 512 seconds aka ages for the 32bit wrap around... |
2349 | * |
2350 | * returns 0 if we may process the packet, |
2351 | * -ERESTARTSYS if we were interrupted (by disconnect signal). */ |
2352 | static int wait_for_and_update_peer_seq(struct drbd_peer_device *peer_device, const u32 peer_seq) |
2353 | { |
2354 | struct drbd_device *device = peer_device->device; |
2355 | DEFINE_WAIT(wait); |
2356 | long timeout; |
2357 | int ret = 0, tp; |
2358 | |
2359 | if (!test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags)) |
2360 | return 0; |
2361 | |
2362 | spin_lock(lock: &device->peer_seq_lock); |
2363 | for (;;) { |
2364 | if (!seq_greater(a: peer_seq - 1, b: device->peer_seq)) { |
2365 | device->peer_seq = seq_max(a: device->peer_seq, b: peer_seq); |
2366 | break; |
2367 | } |
2368 | |
2369 | if (signal_pending(current)) { |
2370 | ret = -ERESTARTSYS; |
2371 | break; |
2372 | } |
2373 | |
2374 | rcu_read_lock(); |
2375 | tp = rcu_dereference(peer_device->connection->net_conf)->two_primaries; |
2376 | rcu_read_unlock(); |
2377 | |
2378 | if (!tp) |
2379 | break; |
2380 | |
2381 | /* Only need to wait if two_primaries is enabled */ |
2382 | prepare_to_wait(wq_head: &device->seq_wait, wq_entry: &wait, TASK_INTERRUPTIBLE); |
2383 | spin_unlock(lock: &device->peer_seq_lock); |
2384 | rcu_read_lock(); |
2385 | timeout = rcu_dereference(peer_device->connection->net_conf)->ping_timeo*HZ/10; |
2386 | rcu_read_unlock(); |
2387 | timeout = schedule_timeout(timeout); |
2388 | spin_lock(lock: &device->peer_seq_lock); |
2389 | if (!timeout) { |
2390 | ret = -ETIMEDOUT; |
2391 | drbd_err(device, "Timed out waiting for missing ack packets; disconnecting\n" ); |
2392 | break; |
2393 | } |
2394 | } |
2395 | spin_unlock(lock: &device->peer_seq_lock); |
2396 | finish_wait(wq_head: &device->seq_wait, wq_entry: &wait); |
2397 | return ret; |
2398 | } |
2399 | |
2400 | static enum req_op wire_flags_to_bio_op(u32 dpf) |
2401 | { |
2402 | if (dpf & DP_ZEROES) |
2403 | return REQ_OP_WRITE_ZEROES; |
2404 | if (dpf & DP_DISCARD) |
2405 | return REQ_OP_DISCARD; |
2406 | else |
2407 | return REQ_OP_WRITE; |
2408 | } |
2409 | |
2410 | /* see also bio_flags_to_wire() */ |
2411 | static blk_opf_t wire_flags_to_bio(struct drbd_connection *connection, u32 dpf) |
2412 | { |
2413 | return wire_flags_to_bio_op(dpf) | |
2414 | (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | |
2415 | (dpf & DP_FUA ? REQ_FUA : 0) | |
2416 | (dpf & DP_FLUSH ? REQ_PREFLUSH : 0); |
2417 | } |
2418 | |
2419 | static void fail_postponed_requests(struct drbd_device *device, sector_t sector, |
2420 | unsigned int size) |
2421 | { |
2422 | struct drbd_peer_device *peer_device = first_peer_device(device); |
2423 | struct drbd_interval *i; |
2424 | |
2425 | repeat: |
2426 | drbd_for_each_overlap(i, &device->write_requests, sector, size) { |
2427 | struct drbd_request *req; |
2428 | struct bio_and_error m; |
2429 | |
2430 | if (!i->local) |
2431 | continue; |
2432 | req = container_of(i, struct drbd_request, i); |
2433 | if (!(req->rq_state & RQ_POSTPONED)) |
2434 | continue; |
2435 | req->rq_state &= ~RQ_POSTPONED; |
2436 | __req_mod(req, what: NEG_ACKED, peer_device, m: &m); |
2437 | spin_unlock_irq(lock: &device->resource->req_lock); |
2438 | if (m.bio) |
2439 | complete_master_bio(device, m: &m); |
2440 | spin_lock_irq(lock: &device->resource->req_lock); |
2441 | goto repeat; |
2442 | } |
2443 | } |
2444 | |
2445 | static int handle_write_conflicts(struct drbd_device *device, |
2446 | struct drbd_peer_request *peer_req) |
2447 | { |
2448 | struct drbd_connection *connection = peer_req->peer_device->connection; |
2449 | bool resolve_conflicts = test_bit(RESOLVE_CONFLICTS, &connection->flags); |
2450 | sector_t sector = peer_req->i.sector; |
2451 | const unsigned int size = peer_req->i.size; |
2452 | struct drbd_interval *i; |
2453 | bool equal; |
2454 | int err; |
2455 | |
2456 | /* |
2457 | * Inserting the peer request into the write_requests tree will prevent |
2458 | * new conflicting local requests from being added. |
2459 | */ |
2460 | drbd_insert_interval(&device->write_requests, &peer_req->i); |
2461 | |
2462 | repeat: |
2463 | drbd_for_each_overlap(i, &device->write_requests, sector, size) { |
2464 | if (i == &peer_req->i) |
2465 | continue; |
2466 | if (i->completed) |
2467 | continue; |
2468 | |
2469 | if (!i->local) { |
2470 | /* |
2471 | * Our peer has sent a conflicting remote request; this |
2472 | * should not happen in a two-node setup. Wait for the |
2473 | * earlier peer request to complete. |
2474 | */ |
2475 | err = drbd_wait_misc(device, i); |
2476 | if (err) |
2477 | goto out; |
2478 | goto repeat; |
2479 | } |
2480 | |
2481 | equal = i->sector == sector && i->size == size; |
2482 | if (resolve_conflicts) { |
2483 | /* |
2484 | * If the peer request is fully contained within the |
2485 | * overlapping request, it can be considered overwritten |
2486 | * and thus superseded; otherwise, it will be retried |
2487 | * once all overlapping requests have completed. |
2488 | */ |
2489 | bool superseded = i->sector <= sector && i->sector + |
2490 | (i->size >> 9) >= sector + (size >> 9); |
2491 | |
2492 | if (!equal) |
2493 | drbd_alert(device, "Concurrent writes detected: " |
2494 | "local=%llus +%u, remote=%llus +%u, " |
2495 | "assuming %s came first\n" , |
2496 | (unsigned long long)i->sector, i->size, |
2497 | (unsigned long long)sector, size, |
2498 | superseded ? "local" : "remote" ); |
2499 | |
2500 | peer_req->w.cb = superseded ? e_send_superseded : |
2501 | e_send_retry_write; |
2502 | list_add_tail(new: &peer_req->w.list, head: &device->done_ee); |
2503 | queue_work(wq: connection->ack_sender, work: &peer_req->peer_device->send_acks_work); |
2504 | |
2505 | err = -ENOENT; |
2506 | goto out; |
2507 | } else { |
2508 | struct drbd_request *req = |
2509 | container_of(i, struct drbd_request, i); |
2510 | |
2511 | if (!equal) |
2512 | drbd_alert(device, "Concurrent writes detected: " |
2513 | "local=%llus +%u, remote=%llus +%u\n" , |
2514 | (unsigned long long)i->sector, i->size, |
2515 | (unsigned long long)sector, size); |
2516 | |
2517 | if (req->rq_state & RQ_LOCAL_PENDING || |
2518 | !(req->rq_state & RQ_POSTPONED)) { |
2519 | /* |
2520 | * Wait for the node with the discard flag to |
2521 | * decide if this request has been superseded |
2522 | * or needs to be retried. |
2523 | * Requests that have been superseded will |
2524 | * disappear from the write_requests tree. |
2525 | * |
2526 | * In addition, wait for the conflicting |
2527 | * request to finish locally before submitting |
2528 | * the conflicting peer request. |
2529 | */ |
2530 | err = drbd_wait_misc(device, &req->i); |
2531 | if (err) { |
2532 | _conn_request_state(connection, NS(conn, C_TIMEOUT), flags: CS_HARD); |
2533 | fail_postponed_requests(device, sector, size); |
2534 | goto out; |
2535 | } |
2536 | goto repeat; |
2537 | } |
2538 | /* |
2539 | * Remember to restart the conflicting requests after |
2540 | * the new peer request has completed. |
2541 | */ |
2542 | peer_req->flags |= EE_RESTART_REQUESTS; |
2543 | } |
2544 | } |
2545 | err = 0; |
2546 | |
2547 | out: |
2548 | if (err) |
2549 | drbd_remove_epoch_entry_interval(device, peer_req); |
2550 | return err; |
2551 | } |
2552 | |
2553 | /* mirrored write */ |
2554 | static int receive_Data(struct drbd_connection *connection, struct packet_info *pi) |
2555 | { |
2556 | struct drbd_peer_device *peer_device; |
2557 | struct drbd_device *device; |
2558 | struct net_conf *nc; |
2559 | sector_t sector; |
2560 | struct drbd_peer_request *peer_req; |
2561 | struct p_data *p = pi->data; |
2562 | u32 peer_seq = be32_to_cpu(p->seq_num); |
2563 | u32 dp_flags; |
2564 | int err, tp; |
2565 | |
2566 | peer_device = conn_peer_device(connection, volume_number: pi->vnr); |
2567 | if (!peer_device) |
2568 | return -EIO; |
2569 | device = peer_device->device; |
2570 | |
2571 | if (!get_ldev(device)) { |
2572 | int err2; |
2573 | |
2574 | err = wait_for_and_update_peer_seq(peer_device, peer_seq); |
2575 | drbd_send_ack_dp(peer_device, P_NEG_ACK, dp: p, data_size: pi->size); |
2576 | atomic_inc(v: &connection->current_epoch->epoch_size); |
2577 | err2 = drbd_drain_block(peer_device, data_size: pi->size); |
2578 | if (!err) |
2579 | err = err2; |
2580 | return err; |
2581 | } |
2582 | |
2583 | /* |
2584 | * Corresponding put_ldev done either below (on various errors), or in |
2585 | * drbd_peer_request_endio, if we successfully submit the data at the |
2586 | * end of this function. |
2587 | */ |
2588 | |
2589 | sector = be64_to_cpu(p->sector); |
2590 | peer_req = read_in_block(peer_device, id: p->block_id, sector, pi); |
2591 | if (!peer_req) { |
2592 | put_ldev(device); |
2593 | return -EIO; |
2594 | } |
2595 | |
2596 | peer_req->w.cb = e_end_block; |
2597 | peer_req->submit_jif = jiffies; |
2598 | peer_req->flags |= EE_APPLICATION; |
2599 | |
2600 | dp_flags = be32_to_cpu(p->dp_flags); |
2601 | peer_req->opf = wire_flags_to_bio(connection, dpf: dp_flags); |
2602 | if (pi->cmd == P_TRIM) { |
2603 | D_ASSERT(peer_device, peer_req->i.size > 0); |
2604 | D_ASSERT(peer_device, peer_req_op(peer_req) == REQ_OP_DISCARD); |
2605 | D_ASSERT(peer_device, peer_req->pages == NULL); |
2606 | /* need to play safe: an older DRBD sender |
2607 | * may mean zero-out while sending P_TRIM. */ |
2608 | if (0 == (connection->agreed_features & DRBD_FF_WZEROES)) |
2609 | peer_req->flags |= EE_ZEROOUT; |
2610 | } else if (pi->cmd == P_ZEROES) { |
2611 | D_ASSERT(peer_device, peer_req->i.size > 0); |
2612 | D_ASSERT(peer_device, peer_req_op(peer_req) == REQ_OP_WRITE_ZEROES); |
2613 | D_ASSERT(peer_device, peer_req->pages == NULL); |
2614 | /* Do (not) pass down BLKDEV_ZERO_NOUNMAP? */ |
2615 | if (dp_flags & DP_DISCARD) |
2616 | peer_req->flags |= EE_TRIM; |
2617 | } else if (peer_req->pages == NULL) { |
2618 | D_ASSERT(device, peer_req->i.size == 0); |
2619 | D_ASSERT(device, dp_flags & DP_FLUSH); |
2620 | } |
2621 | |
2622 | if (dp_flags & DP_MAY_SET_IN_SYNC) |
2623 | peer_req->flags |= EE_MAY_SET_IN_SYNC; |
2624 | |
2625 | spin_lock(lock: &connection->epoch_lock); |
2626 | peer_req->epoch = connection->current_epoch; |
2627 | atomic_inc(v: &peer_req->epoch->epoch_size); |
2628 | atomic_inc(v: &peer_req->epoch->active); |
2629 | spin_unlock(lock: &connection->epoch_lock); |
2630 | |
2631 | rcu_read_lock(); |
2632 | nc = rcu_dereference(peer_device->connection->net_conf); |
2633 | tp = nc->two_primaries; |
2634 | if (peer_device->connection->agreed_pro_version < 100) { |
2635 | switch (nc->wire_protocol) { |
2636 | case DRBD_PROT_C: |
2637 | dp_flags |= DP_SEND_WRITE_ACK; |
2638 | break; |
2639 | case DRBD_PROT_B: |
2640 | dp_flags |= DP_SEND_RECEIVE_ACK; |
2641 | break; |
2642 | } |
2643 | } |
2644 | rcu_read_unlock(); |
2645 | |
2646 | if (dp_flags & DP_SEND_WRITE_ACK) { |
2647 | peer_req->flags |= EE_SEND_WRITE_ACK; |
2648 | inc_unacked(device); |
2649 | /* corresponding dec_unacked() in e_end_block() |
2650 | * respective _drbd_clear_done_ee */ |
2651 | } |
2652 | |
2653 | if (dp_flags & DP_SEND_RECEIVE_ACK) { |
2654 | /* I really don't like it that the receiver thread |
2655 | * sends on the msock, but anyways */ |
2656 | drbd_send_ack(peer_device, P_RECV_ACK, peer_req); |
2657 | } |
2658 | |
2659 | if (tp) { |
2660 | /* two primaries implies protocol C */ |
2661 | D_ASSERT(device, dp_flags & DP_SEND_WRITE_ACK); |
2662 | peer_req->flags |= EE_IN_INTERVAL_TREE; |
2663 | err = wait_for_and_update_peer_seq(peer_device, peer_seq); |
2664 | if (err) |
2665 | goto out_interrupted; |
2666 | spin_lock_irq(lock: &device->resource->req_lock); |
2667 | err = handle_write_conflicts(device, peer_req); |
2668 | if (err) { |
2669 | spin_unlock_irq(lock: &device->resource->req_lock); |
2670 | if (err == -ENOENT) { |
2671 | put_ldev(device); |
2672 | return 0; |
2673 | } |
2674 | goto out_interrupted; |
2675 | } |
2676 | } else { |
2677 | update_peer_seq(peer_device, peer_seq); |
2678 | spin_lock_irq(lock: &device->resource->req_lock); |
2679 | } |
2680 | /* TRIM and is processed synchronously, |
2681 | * we wait for all pending requests, respectively wait for |
2682 | * active_ee to become empty in drbd_submit_peer_request(); |
2683 | * better not add ourselves here. */ |
2684 | if ((peer_req->flags & (EE_TRIM | EE_ZEROOUT)) == 0) |
2685 | list_add_tail(new: &peer_req->w.list, head: &device->active_ee); |
2686 | spin_unlock_irq(lock: &device->resource->req_lock); |
2687 | |
2688 | if (device->state.conn == C_SYNC_TARGET) |
2689 | wait_event(device->ee_wait, !overlapping_resync_write(device, peer_req)); |
2690 | |
2691 | if (device->state.pdsk < D_INCONSISTENT) { |
2692 | /* In case we have the only disk of the cluster, */ |
2693 | drbd_set_out_of_sync(peer_device, peer_req->i.sector, peer_req->i.size); |
2694 | peer_req->flags &= ~EE_MAY_SET_IN_SYNC; |
2695 | drbd_al_begin_io(device, i: &peer_req->i); |
2696 | peer_req->flags |= EE_CALL_AL_COMPLETE_IO; |
2697 | } |
2698 | |
2699 | err = drbd_submit_peer_request(peer_req); |
2700 | if (!err) |
2701 | return 0; |
2702 | |
2703 | /* don't care for the reason here */ |
2704 | drbd_err(device, "submit failed, triggering re-connect\n" ); |
2705 | spin_lock_irq(lock: &device->resource->req_lock); |
2706 | list_del(entry: &peer_req->w.list); |
2707 | drbd_remove_epoch_entry_interval(device, peer_req); |
2708 | spin_unlock_irq(lock: &device->resource->req_lock); |
2709 | if (peer_req->flags & EE_CALL_AL_COMPLETE_IO) { |
2710 | peer_req->flags &= ~EE_CALL_AL_COMPLETE_IO; |
2711 | drbd_al_complete_io(device, i: &peer_req->i); |
2712 | } |
2713 | |
2714 | out_interrupted: |
2715 | drbd_may_finish_epoch(connection, epoch: peer_req->epoch, ev: EV_PUT | EV_CLEANUP); |
2716 | put_ldev(device); |
2717 | drbd_free_peer_req(device, peer_req); |
2718 | return err; |
2719 | } |
2720 | |
2721 | /* We may throttle resync, if the lower device seems to be busy, |
2722 | * and current sync rate is above c_min_rate. |
2723 | * |
2724 | * To decide whether or not the lower device is busy, we use a scheme similar |
2725 | * to MD RAID is_mddev_idle(): if the partition stats reveal "significant" |
2726 | * (more than 64 sectors) of activity we cannot account for with our own resync |
2727 | * activity, it obviously is "busy". |
2728 | * |
2729 | * The current sync rate used here uses only the most recent two step marks, |
2730 | * to have a short time average so we can react faster. |
2731 | */ |
2732 | bool drbd_rs_should_slow_down(struct drbd_peer_device *peer_device, sector_t sector, |
2733 | bool throttle_if_app_is_waiting) |
2734 | { |
2735 | struct drbd_device *device = peer_device->device; |
2736 | struct lc_element *tmp; |
2737 | bool throttle = drbd_rs_c_min_rate_throttle(device); |
2738 | |
2739 | if (!throttle || throttle_if_app_is_waiting) |
2740 | return throttle; |
2741 | |
2742 | spin_lock_irq(lock: &device->al_lock); |
2743 | tmp = lc_find(lc: device->resync, BM_SECT_TO_EXT(sector)); |
2744 | if (tmp) { |
2745 | struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); |
2746 | if (test_bit(BME_PRIORITY, &bm_ext->flags)) |
2747 | throttle = false; |
2748 | /* Do not slow down if app IO is already waiting for this extent, |
2749 | * and our progress is necessary for application IO to complete. */ |
2750 | } |
2751 | spin_unlock_irq(lock: &device->al_lock); |
2752 | |
2753 | return throttle; |
2754 | } |
2755 | |
2756 | bool drbd_rs_c_min_rate_throttle(struct drbd_device *device) |
2757 | { |
2758 | struct gendisk *disk = device->ldev->backing_bdev->bd_disk; |
2759 | unsigned long db, dt, dbdt; |
2760 | unsigned int c_min_rate; |
2761 | int curr_events; |
2762 | |
2763 | rcu_read_lock(); |
2764 | c_min_rate = rcu_dereference(device->ldev->disk_conf)->c_min_rate; |
2765 | rcu_read_unlock(); |
2766 | |
2767 | /* feature disabled? */ |
2768 | if (c_min_rate == 0) |
2769 | return false; |
2770 | |
2771 | curr_events = (int)part_stat_read_accum(disk->part0, sectors) - |
2772 | atomic_read(v: &device->rs_sect_ev); |
2773 | |
2774 | if (atomic_read(v: &device->ap_actlog_cnt) |
2775 | || curr_events - device->rs_last_events > 64) { |
2776 | unsigned long rs_left; |
2777 | int i; |
2778 | |
2779 | device->rs_last_events = curr_events; |
2780 | |
2781 | /* sync speed average over the last 2*DRBD_SYNC_MARK_STEP, |
2782 | * approx. */ |
2783 | i = (device->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS; |
2784 | |
2785 | if (device->state.conn == C_VERIFY_S || device->state.conn == C_VERIFY_T) |
2786 | rs_left = device->ov_left; |
2787 | else |
2788 | rs_left = drbd_bm_total_weight(device) - device->rs_failed; |
2789 | |
2790 | dt = ((long)jiffies - (long)device->rs_mark_time[i]) / HZ; |
2791 | if (!dt) |
2792 | dt++; |
2793 | db = device->rs_mark_left[i] - rs_left; |
2794 | dbdt = Bit2KB(db/dt); |
2795 | |
2796 | if (dbdt > c_min_rate) |
2797 | return true; |
2798 | } |
2799 | return false; |
2800 | } |
2801 | |
2802 | static int receive_DataRequest(struct drbd_connection *connection, struct packet_info *pi) |
2803 | { |
2804 | struct drbd_peer_device *peer_device; |
2805 | struct drbd_device *device; |
2806 | sector_t sector; |
2807 | sector_t capacity; |
2808 | struct drbd_peer_request *peer_req; |
2809 | struct digest_info *di = NULL; |
2810 | int size, verb; |
2811 | struct p_block_req *p = pi->data; |
2812 | |
2813 | peer_device = conn_peer_device(connection, volume_number: pi->vnr); |
2814 | if (!peer_device) |
2815 | return -EIO; |
2816 | device = peer_device->device; |
2817 | capacity = get_capacity(disk: device->vdisk); |
2818 | |
2819 | sector = be64_to_cpu(p->sector); |
2820 | size = be32_to_cpu(p->blksize); |
2821 | |
2822 | if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) { |
2823 | drbd_err(device, "%s:%d: sector: %llus, size: %u\n" , __FILE__, __LINE__, |
2824 | (unsigned long long)sector, size); |
2825 | return -EINVAL; |
2826 | } |
2827 | if (sector + (size>>9) > capacity) { |
2828 | drbd_err(device, "%s:%d: sector: %llus, size: %u\n" , __FILE__, __LINE__, |
2829 | (unsigned long long)sector, size); |
2830 | return -EINVAL; |
2831 | } |
2832 | |
2833 | if (!get_ldev_if_state(device, D_UP_TO_DATE)) { |
2834 | verb = 1; |
2835 | switch (pi->cmd) { |
2836 | case P_DATA_REQUEST: |
2837 | drbd_send_ack_rp(peer_device, P_NEG_DREPLY, rp: p); |
2838 | break; |
2839 | case P_RS_THIN_REQ: |
2840 | case P_RS_DATA_REQUEST: |
2841 | case P_CSUM_RS_REQUEST: |
2842 | case P_OV_REQUEST: |
2843 | drbd_send_ack_rp(peer_device, P_NEG_RS_DREPLY , rp: p); |
2844 | break; |
2845 | case P_OV_REPLY: |
2846 | verb = 0; |
2847 | dec_rs_pending(peer_device); |
2848 | drbd_send_ack_ex(peer_device, P_OV_RESULT, sector, blksize: size, ID_IN_SYNC); |
2849 | break; |
2850 | default: |
2851 | BUG(); |
2852 | } |
2853 | if (verb && drbd_ratelimit()) |
2854 | drbd_err(device, "Can not satisfy peer's read request, " |
2855 | "no local data.\n" ); |
2856 | |
2857 | /* drain possibly payload */ |
2858 | return drbd_drain_block(peer_device, data_size: pi->size); |
2859 | } |
2860 | |
2861 | /* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD |
2862 | * "criss-cross" setup, that might cause write-out on some other DRBD, |
2863 | * which in turn might block on the other node at this very place. */ |
2864 | peer_req = drbd_alloc_peer_req(peer_device, id: p->block_id, sector, request_size: size, |
2865 | payload_size: size, GFP_NOIO); |
2866 | if (!peer_req) { |
2867 | put_ldev(device); |
2868 | return -ENOMEM; |
2869 | } |
2870 | peer_req->opf = REQ_OP_READ; |
2871 | |
2872 | switch (pi->cmd) { |
2873 | case P_DATA_REQUEST: |
2874 | peer_req->w.cb = w_e_end_data_req; |
2875 | /* application IO, don't drbd_rs_begin_io */ |
2876 | peer_req->flags |= EE_APPLICATION; |
2877 | goto submit; |
2878 | |
2879 | case P_RS_THIN_REQ: |
2880 | /* If at some point in the future we have a smart way to |
2881 | find out if this data block is completely deallocated, |
2882 | then we would do something smarter here than reading |
2883 | the block... */ |
2884 | peer_req->flags |= EE_RS_THIN_REQ; |
2885 | fallthrough; |
2886 | case P_RS_DATA_REQUEST: |
2887 | peer_req->w.cb = w_e_end_rsdata_req; |
2888 | /* used in the sector offset progress display */ |
2889 | device->bm_resync_fo = BM_SECT_TO_BIT(sector); |
2890 | break; |
2891 | |
2892 | case P_OV_REPLY: |
2893 | case P_CSUM_RS_REQUEST: |
2894 | di = kmalloc(size: sizeof(*di) + pi->size, GFP_NOIO); |
2895 | if (!di) |
2896 | goto out_free_e; |
2897 | |
2898 | di->digest_size = pi->size; |
2899 | di->digest = (((char *)di)+sizeof(struct digest_info)); |
2900 | |
2901 | peer_req->digest = di; |
2902 | peer_req->flags |= EE_HAS_DIGEST; |
2903 | |
2904 | if (drbd_recv_all(connection: peer_device->connection, buf: di->digest, size: pi->size)) |
2905 | goto out_free_e; |
2906 | |
2907 | if (pi->cmd == P_CSUM_RS_REQUEST) { |
2908 | D_ASSERT(device, peer_device->connection->agreed_pro_version >= 89); |
2909 | peer_req->w.cb = w_e_end_csum_rs_req; |
2910 | /* used in the sector offset progress display */ |
2911 | device->bm_resync_fo = BM_SECT_TO_BIT(sector); |
2912 | /* remember to report stats in drbd_resync_finished */ |
2913 | device->use_csums = true; |
2914 | } else if (pi->cmd == P_OV_REPLY) { |
2915 | /* track progress, we may need to throttle */ |
2916 | atomic_add(i: size >> 9, v: &device->rs_sect_in); |
2917 | peer_req->w.cb = w_e_end_ov_reply; |
2918 | dec_rs_pending(peer_device); |
2919 | /* drbd_rs_begin_io done when we sent this request, |
2920 | * but accounting still needs to be done. */ |
2921 | goto submit_for_resync; |
2922 | } |
2923 | break; |
2924 | |
2925 | case P_OV_REQUEST: |
2926 | if (device->ov_start_sector == ~(sector_t)0 && |
2927 | peer_device->connection->agreed_pro_version >= 90) { |
2928 | unsigned long now = jiffies; |
2929 | int i; |
2930 | device->ov_start_sector = sector; |
2931 | device->ov_position = sector; |
2932 | device->ov_left = drbd_bm_bits(device) - BM_SECT_TO_BIT(sector); |
2933 | device->rs_total = device->ov_left; |
2934 | for (i = 0; i < DRBD_SYNC_MARKS; i++) { |
2935 | device->rs_mark_left[i] = device->ov_left; |
2936 | device->rs_mark_time[i] = now; |
2937 | } |
2938 | drbd_info(device, "Online Verify start sector: %llu\n" , |
2939 | (unsigned long long)sector); |
2940 | } |
2941 | peer_req->w.cb = w_e_end_ov_req; |
2942 | break; |
2943 | |
2944 | default: |
2945 | BUG(); |
2946 | } |
2947 | |
2948 | /* Throttle, drbd_rs_begin_io and submit should become asynchronous |
2949 | * wrt the receiver, but it is not as straightforward as it may seem. |
2950 | * Various places in the resync start and stop logic assume resync |
2951 | * requests are processed in order, requeuing this on the worker thread |
2952 | * introduces a bunch of new code for synchronization between threads. |
2953 | * |
2954 | * Unlimited throttling before drbd_rs_begin_io may stall the resync |
2955 | * "forever", throttling after drbd_rs_begin_io will lock that extent |
2956 | * for application writes for the same time. For now, just throttle |
2957 | * here, where the rest of the code expects the receiver to sleep for |
2958 | * a while, anyways. |
2959 | */ |
2960 | |
2961 | /* Throttle before drbd_rs_begin_io, as that locks out application IO; |
2962 | * this defers syncer requests for some time, before letting at least |
2963 | * on request through. The resync controller on the receiving side |
2964 | * will adapt to the incoming rate accordingly. |
2965 | * |
2966 | * We cannot throttle here if remote is Primary/SyncTarget: |
2967 | * we would also throttle its application reads. |
2968 | * In that case, throttling is done on the SyncTarget only. |
2969 | */ |
2970 | |
2971 | /* Even though this may be a resync request, we do add to "read_ee"; |
2972 | * "sync_ee" is only used for resync WRITEs. |
2973 | * Add to list early, so debugfs can find this request |
2974 | * even if we have to sleep below. */ |
2975 | spin_lock_irq(lock: &device->resource->req_lock); |
2976 | list_add_tail(new: &peer_req->w.list, head: &device->read_ee); |
2977 | spin_unlock_irq(lock: &device->resource->req_lock); |
2978 | |
2979 | update_receiver_timing_details(connection, drbd_rs_should_slow_down); |
2980 | if (device->state.peer != R_PRIMARY |
2981 | && drbd_rs_should_slow_down(peer_device, sector, throttle_if_app_is_waiting: false)) |
2982 | schedule_timeout_uninterruptible(HZ/10); |
2983 | update_receiver_timing_details(connection, drbd_rs_begin_io); |
2984 | if (drbd_rs_begin_io(device, sector)) |
2985 | goto out_free_e; |
2986 | |
2987 | submit_for_resync: |
2988 | atomic_add(i: size >> 9, v: &device->rs_sect_ev); |
2989 | |
2990 | submit: |
2991 | update_receiver_timing_details(connection, drbd_submit_peer_request); |
2992 | inc_unacked(device); |
2993 | if (drbd_submit_peer_request(peer_req) == 0) |
2994 | return 0; |
2995 | |
2996 | /* don't care for the reason here */ |
2997 | drbd_err(device, "submit failed, triggering re-connect\n" ); |
2998 | |
2999 | out_free_e: |
3000 | spin_lock_irq(lock: &device->resource->req_lock); |
3001 | list_del(entry: &peer_req->w.list); |
3002 | spin_unlock_irq(lock: &device->resource->req_lock); |
3003 | /* no drbd_rs_complete_io(), we are dropping the connection anyways */ |
3004 | |
3005 | put_ldev(device); |
3006 | drbd_free_peer_req(device, peer_req); |
3007 | return -EIO; |
3008 | } |
3009 | |
3010 | /* |
3011 | * drbd_asb_recover_0p - Recover after split-brain with no remaining primaries |
3012 | */ |
3013 | static int drbd_asb_recover_0p(struct drbd_peer_device *peer_device) __must_hold(local) |
3014 | { |
3015 | struct drbd_device *device = peer_device->device; |
3016 | int self, peer, rv = -100; |
3017 | unsigned long ch_self, ch_peer; |
3018 | enum drbd_after_sb_p after_sb_0p; |
3019 | |
3020 | self = device->ldev->md.uuid[UI_BITMAP] & 1; |
3021 | peer = device->p_uuid[UI_BITMAP] & 1; |
3022 | |
3023 | ch_peer = device->p_uuid[UI_SIZE]; |
3024 | ch_self = device->comm_bm_set; |
3025 | |
3026 | rcu_read_lock(); |
3027 | after_sb_0p = rcu_dereference(peer_device->connection->net_conf)->after_sb_0p; |
3028 | rcu_read_unlock(); |
3029 | switch (after_sb_0p) { |
3030 | case ASB_CONSENSUS: |
3031 | case ASB_DISCARD_SECONDARY: |
3032 | case ASB_CALL_HELPER: |
3033 | case ASB_VIOLENTLY: |
3034 | drbd_err(device, "Configuration error.\n" ); |
3035 | break; |
3036 | case ASB_DISCONNECT: |
3037 | break; |
3038 | case ASB_DISCARD_YOUNGER_PRI: |
3039 | if (self == 0 && peer == 1) { |
3040 | rv = -1; |
3041 | break; |
3042 | } |
3043 | if (self == 1 && peer == 0) { |
3044 | rv = 1; |
3045 | break; |
3046 | } |
3047 | fallthrough; /* to one of the other strategies */ |
3048 | case ASB_DISCARD_OLDER_PRI: |
3049 | if (self == 0 && peer == 1) { |
3050 | rv = 1; |
3051 | break; |
3052 | } |
3053 | if (self == 1 && peer == 0) { |
3054 | rv = -1; |
3055 | break; |
3056 | } |
3057 | /* Else fall through to one of the other strategies... */ |
3058 | drbd_warn(device, "Discard younger/older primary did not find a decision\n" |
3059 | "Using discard-least-changes instead\n" ); |
3060 | fallthrough; |
3061 | case ASB_DISCARD_ZERO_CHG: |
3062 | if (ch_peer == 0 && ch_self == 0) { |
3063 | rv = test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags) |
3064 | ? -1 : 1; |
3065 | break; |
3066 | } else { |
3067 | if (ch_peer == 0) { rv = 1; break; } |
3068 | if (ch_self == 0) { rv = -1; break; } |
3069 | } |
3070 | if (after_sb_0p == ASB_DISCARD_ZERO_CHG) |
3071 | break; |
3072 | fallthrough; |
3073 | case ASB_DISCARD_LEAST_CHG: |
3074 | if (ch_self < ch_peer) |
3075 | rv = -1; |
3076 | else if (ch_self > ch_peer) |
3077 | rv = 1; |
3078 | else /* ( ch_self == ch_peer ) */ |
3079 | /* Well, then use something else. */ |
3080 | rv = test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags) |
3081 | ? -1 : 1; |
3082 | break; |
3083 | case ASB_DISCARD_LOCAL: |
3084 | rv = -1; |
3085 | break; |
3086 | case ASB_DISCARD_REMOTE: |
3087 | rv = 1; |
3088 | } |
3089 | |
3090 | return rv; |
3091 | } |
3092 | |
3093 | /* |
3094 | * drbd_asb_recover_1p - Recover after split-brain with one remaining primary |
3095 | */ |
3096 | static int drbd_asb_recover_1p(struct drbd_peer_device *peer_device) __must_hold(local) |
3097 | { |
3098 | struct drbd_device *device = peer_device->device; |
3099 | int hg, rv = -100; |
3100 | enum drbd_after_sb_p after_sb_1p; |
3101 | |
3102 | rcu_read_lock(); |
3103 | after_sb_1p = rcu_dereference(peer_device->connection->net_conf)->after_sb_1p; |
3104 | rcu_read_unlock(); |
3105 | switch (after_sb_1p) { |
3106 | case ASB_DISCARD_YOUNGER_PRI: |
3107 | case ASB_DISCARD_OLDER_PRI: |
3108 | case ASB_DISCARD_LEAST_CHG: |
3109 | case ASB_DISCARD_LOCAL: |
3110 | case ASB_DISCARD_REMOTE: |
3111 | case ASB_DISCARD_ZERO_CHG: |
3112 | drbd_err(device, "Configuration error.\n" ); |
3113 | break; |
3114 | case ASB_DISCONNECT: |
3115 | break; |
3116 | case ASB_CONSENSUS: |
3117 | hg = drbd_asb_recover_0p(peer_device); |
3118 | if (hg == -1 && device->state.role == R_SECONDARY) |
3119 | rv = hg; |
3120 | if (hg == 1 && device->state.role == R_PRIMARY) |
3121 | rv = hg; |
3122 | break; |
3123 | case ASB_VIOLENTLY: |
3124 | rv = drbd_asb_recover_0p(peer_device); |
3125 | break; |
3126 | case ASB_DISCARD_SECONDARY: |
3127 | return device->state.role == R_PRIMARY ? 1 : -1; |
3128 | case ASB_CALL_HELPER: |
3129 | hg = drbd_asb_recover_0p(peer_device); |
3130 | if (hg == -1 && device->state.role == R_PRIMARY) { |
3131 | enum drbd_state_rv rv2; |
3132 | |
3133 | /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, |
3134 | * we might be here in C_WF_REPORT_PARAMS which is transient. |
3135 | * we do not need to wait for the after state change work either. */ |
3136 | rv2 = drbd_change_state(device, f: CS_VERBOSE, NS(role, R_SECONDARY)); |
3137 | if (rv2 != SS_SUCCESS) { |
3138 | drbd_khelper(device, cmd: "pri-lost-after-sb" ); |
3139 | } else { |
3140 | drbd_warn(device, "Successfully gave up primary role.\n" ); |
3141 | rv = hg; |
3142 | } |
3143 | } else |
3144 | rv = hg; |
3145 | } |
3146 | |
3147 | return rv; |
3148 | } |
3149 | |
3150 | /* |
3151 | * drbd_asb_recover_2p - Recover after split-brain with two remaining primaries |
3152 | */ |
3153 | static int drbd_asb_recover_2p(struct drbd_peer_device *peer_device) __must_hold(local) |
3154 | { |
3155 | struct drbd_device *device = peer_device->device; |
3156 | int hg, rv = -100; |
3157 | enum drbd_after_sb_p after_sb_2p; |
3158 | |
3159 | rcu_read_lock(); |
3160 | after_sb_2p = rcu_dereference(peer_device->connection->net_conf)->after_sb_2p; |
3161 | rcu_read_unlock(); |
3162 | switch (after_sb_2p) { |
3163 | case ASB_DISCARD_YOUNGER_PRI: |
3164 | case ASB_DISCARD_OLDER_PRI: |
3165 | case ASB_DISCARD_LEAST_CHG: |
3166 | case ASB_DISCARD_LOCAL: |
3167 | case ASB_DISCARD_REMOTE: |
3168 | case ASB_CONSENSUS: |
3169 | case ASB_DISCARD_SECONDARY: |
3170 | case ASB_DISCARD_ZERO_CHG: |
3171 | drbd_err(device, "Configuration error.\n" ); |
3172 | break; |
3173 | case ASB_VIOLENTLY: |
3174 | rv = drbd_asb_recover_0p(peer_device); |
3175 | break; |
3176 | case ASB_DISCONNECT: |
3177 | break; |
3178 | case ASB_CALL_HELPER: |
3179 | hg = drbd_asb_recover_0p(peer_device); |
3180 | if (hg == -1) { |
3181 | enum drbd_state_rv rv2; |
3182 | |
3183 | /* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE, |
3184 | * we might be here in C_WF_REPORT_PARAMS which is transient. |
3185 | * we do not need to wait for the after state change work either. */ |
3186 | rv2 = drbd_change_state(device, f: CS_VERBOSE, NS(role, R_SECONDARY)); |
3187 | if (rv2 != SS_SUCCESS) { |
3188 | drbd_khelper(device, cmd: "pri-lost-after-sb" ); |
3189 | } else { |
3190 | drbd_warn(device, "Successfully gave up primary role.\n" ); |
3191 | rv = hg; |
3192 | } |
3193 | } else |
3194 | rv = hg; |
3195 | } |
3196 | |
3197 | return rv; |
3198 | } |
3199 | |
3200 | static void drbd_uuid_dump(struct drbd_device *device, char *text, u64 *uuid, |
3201 | u64 bits, u64 flags) |
3202 | { |
3203 | if (!uuid) { |
3204 | drbd_info(device, "%s uuid info vanished while I was looking!\n" , text); |
3205 | return; |
3206 | } |
3207 | drbd_info(device, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n" , |
3208 | text, |
3209 | (unsigned long long)uuid[UI_CURRENT], |
3210 | (unsigned long long)uuid[UI_BITMAP], |
3211 | (unsigned long long)uuid[UI_HISTORY_START], |
3212 | (unsigned long long)uuid[UI_HISTORY_END], |
3213 | (unsigned long long)bits, |
3214 | (unsigned long long)flags); |
3215 | } |
3216 | |
3217 | /* |
3218 | 100 after split brain try auto recover |
3219 | 2 C_SYNC_SOURCE set BitMap |
3220 | 1 C_SYNC_SOURCE use BitMap |
3221 | 0 no Sync |
3222 | -1 C_SYNC_TARGET use BitMap |
3223 | -2 C_SYNC_TARGET set BitMap |
3224 | -100 after split brain, disconnect |
3225 | -1000 unrelated data |
3226 | -1091 requires proto 91 |
3227 | -1096 requires proto 96 |
3228 | */ |
3229 | |
3230 | static int drbd_uuid_compare(struct drbd_peer_device *const peer_device, |
3231 | enum drbd_role const peer_role, int *rule_nr) __must_hold(local) |
3232 | { |
3233 | struct drbd_connection *const connection = peer_device->connection; |
3234 | struct drbd_device *device = peer_device->device; |
3235 | u64 self, peer; |
3236 | int i, j; |
3237 | |
3238 | self = device->ldev->md.uuid[UI_CURRENT] & ~((u64)1); |
3239 | peer = device->p_uuid[UI_CURRENT] & ~((u64)1); |
3240 | |
3241 | *rule_nr = 10; |
3242 | if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED) |
3243 | return 0; |
3244 | |
3245 | *rule_nr = 20; |
3246 | if ((self == UUID_JUST_CREATED || self == (u64)0) && |
3247 | peer != UUID_JUST_CREATED) |
3248 | return -2; |
3249 | |
3250 | *rule_nr = 30; |
3251 | if (self != UUID_JUST_CREATED && |
3252 | (peer == UUID_JUST_CREATED || peer == (u64)0)) |
3253 | return 2; |
3254 | |
3255 | if (self == peer) { |
3256 | int rct, dc; /* roles at crash time */ |
3257 | |
3258 | if (device->p_uuid[UI_BITMAP] == (u64)0 && device->ldev->md.uuid[UI_BITMAP] != (u64)0) { |
3259 | |
3260 | if (connection->agreed_pro_version < 91) |
3261 | return -1091; |
3262 | |
3263 | if ((device->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (device->p_uuid[UI_HISTORY_START] & ~((u64)1)) && |
3264 | (device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (device->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) { |
3265 | drbd_info(device, "was SyncSource, missed the resync finished event, corrected myself:\n" ); |
3266 | drbd_uuid_move_history(device); |
3267 | device->ldev->md.uuid[UI_HISTORY_START] = device->ldev->md.uuid[UI_BITMAP]; |
3268 | device->ldev->md.uuid[UI_BITMAP] = 0; |
3269 | |
3270 | drbd_uuid_dump(device, text: "self" , uuid: device->ldev->md.uuid, |
3271 | bits: device->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(device) : 0, flags: 0); |
3272 | *rule_nr = 34; |
3273 | } else { |
3274 | drbd_info(device, "was SyncSource (peer failed to write sync_uuid)\n" ); |
3275 | *rule_nr = 36; |
3276 | } |
3277 | |
3278 | return 1; |
3279 | } |
3280 | |
3281 | if (device->ldev->md.uuid[UI_BITMAP] == (u64)0 && device->p_uuid[UI_BITMAP] != (u64)0) { |
3282 | |
3283 | if (connection->agreed_pro_version < 91) |
3284 | return -1091; |
3285 | |
3286 | if ((device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (device->p_uuid[UI_BITMAP] & ~((u64)1)) && |
3287 | (device->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (device->p_uuid[UI_HISTORY_START] & ~((u64)1))) { |
3288 | drbd_info(device, "was SyncTarget, peer missed the resync finished event, corrected peer:\n" ); |
3289 | |
3290 | device->p_uuid[UI_HISTORY_START + 1] = device->p_uuid[UI_HISTORY_START]; |
3291 | device->p_uuid[UI_HISTORY_START] = device->p_uuid[UI_BITMAP]; |
3292 | device->p_uuid[UI_BITMAP] = 0UL; |
3293 | |
3294 | drbd_uuid_dump(device, text: "peer" , uuid: device->p_uuid, bits: device->p_uuid[UI_SIZE], flags: device->p_uuid[UI_FLAGS]); |
3295 | *rule_nr = 35; |
3296 | } else { |
3297 | drbd_info(device, "was SyncTarget (failed to write sync_uuid)\n" ); |
3298 | *rule_nr = 37; |
3299 | } |
3300 | |
3301 | return -1; |
3302 | } |
3303 | |
3304 | /* Common power [off|failure] */ |
3305 | rct = (test_bit(CRASHED_PRIMARY, &device->flags) ? 1 : 0) + |
3306 | (device->p_uuid[UI_FLAGS] & 2); |
3307 | /* lowest bit is set when we were primary, |
3308 | * next bit (weight 2) is set when peer was primary */ |
3309 | *rule_nr = 40; |
3310 | |
3311 | /* Neither has the "crashed primary" flag set, |
3312 | * only a replication link hickup. */ |
3313 | if (rct == 0) |
3314 | return 0; |
3315 | |
3316 | /* Current UUID equal and no bitmap uuid; does not necessarily |
3317 | * mean this was a "simultaneous hard crash", maybe IO was |
3318 | * frozen, so no UUID-bump happened. |
3319 | * This is a protocol change, overload DRBD_FF_WSAME as flag |
3320 | * for "new-enough" peer DRBD version. */ |
3321 | if (device->state.role == R_PRIMARY || peer_role == R_PRIMARY) { |
3322 | *rule_nr = 41; |
3323 | if (!(connection->agreed_features & DRBD_FF_WSAME)) { |
3324 | drbd_warn(peer_device, "Equivalent unrotated UUIDs, but current primary present.\n" ); |
3325 | return -(0x10000 | PRO_VERSION_MAX | (DRBD_FF_WSAME << 8)); |
3326 | } |
3327 | if (device->state.role == R_PRIMARY && peer_role == R_PRIMARY) { |
3328 | /* At least one has the "crashed primary" bit set, |
3329 | * both are primary now, but neither has rotated its UUIDs? |
3330 | * "Can not happen." */ |
3331 | drbd_err(peer_device, "Equivalent unrotated UUIDs, but both are primary. Can not resolve this.\n" ); |
3332 | return -100; |
3333 | } |
3334 | if (device->state.role == R_PRIMARY) |
3335 | return 1; |
3336 | return -1; |
3337 | } |
3338 | |
3339 | /* Both are secondary. |
3340 | * Really looks like recovery from simultaneous hard crash. |
3341 | * Check which had been primary before, and arbitrate. */ |
3342 | switch (rct) { |
3343 | case 0: /* !self_pri && !peer_pri */ return 0; /* already handled */ |
3344 | case 1: /* self_pri && !peer_pri */ return 1; |
3345 | case 2: /* !self_pri && peer_pri */ return -1; |
3346 | case 3: /* self_pri && peer_pri */ |
3347 | dc = test_bit(RESOLVE_CONFLICTS, &connection->flags); |
3348 | return dc ? -1 : 1; |
3349 | } |
3350 | } |
3351 | |
3352 | *rule_nr = 50; |
3353 | peer = device->p_uuid[UI_BITMAP] & ~((u64)1); |
3354 | if (self == peer) |
3355 | return -1; |
3356 | |
3357 | *rule_nr = 51; |
3358 | peer = device->p_uuid[UI_HISTORY_START] & ~((u64)1); |
3359 | if (self == peer) { |
3360 | if (connection->agreed_pro_version < 96 ? |
3361 | (device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == |
3362 | (device->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) : |
3363 | peer + UUID_NEW_BM_OFFSET == (device->p_uuid[UI_BITMAP] & ~((u64)1))) { |
3364 | /* The last P_SYNC_UUID did not get though. Undo the last start of |
3365 | resync as sync source modifications of the peer's UUIDs. */ |
3366 | |
3367 | if (connection->agreed_pro_version < 91) |
3368 | return -1091; |
3369 | |
3370 | device->p_uuid[UI_BITMAP] = device->p_uuid[UI_HISTORY_START]; |
3371 | device->p_uuid[UI_HISTORY_START] = device->p_uuid[UI_HISTORY_START + 1]; |
3372 | |
3373 | drbd_info(device, "Lost last syncUUID packet, corrected:\n" ); |
3374 | drbd_uuid_dump(device, text: "peer" , uuid: device->p_uuid, bits: device->p_uuid[UI_SIZE], flags: device->p_uuid[UI_FLAGS]); |
3375 | |
3376 | return -1; |
3377 | } |
3378 | } |
3379 | |
3380 | *rule_nr = 60; |
3381 | self = device->ldev->md.uuid[UI_CURRENT] & ~((u64)1); |
3382 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { |
3383 | peer = device->p_uuid[i] & ~((u64)1); |
3384 | if (self == peer) |
3385 | return -2; |
3386 | } |
3387 | |
3388 | *rule_nr = 70; |
3389 | self = device->ldev->md.uuid[UI_BITMAP] & ~((u64)1); |
3390 | peer = device->p_uuid[UI_CURRENT] & ~((u64)1); |
3391 | if (self == peer) |
3392 | return 1; |
3393 | |
3394 | *rule_nr = 71; |
3395 | self = device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1); |
3396 | if (self == peer) { |
3397 | if (connection->agreed_pro_version < 96 ? |
3398 | (device->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == |
3399 | (device->p_uuid[UI_HISTORY_START] & ~((u64)1)) : |
3400 | self + UUID_NEW_BM_OFFSET == (device->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) { |
3401 | /* The last P_SYNC_UUID did not get though. Undo the last start of |
3402 | resync as sync source modifications of our UUIDs. */ |
3403 | |
3404 | if (connection->agreed_pro_version < 91) |
3405 | return -1091; |
3406 | |
3407 | __drbd_uuid_set(device, idx: UI_BITMAP, val: device->ldev->md.uuid[UI_HISTORY_START]); |
3408 | __drbd_uuid_set(device, idx: UI_HISTORY_START, val: device->ldev->md.uuid[UI_HISTORY_START + 1]); |
3409 | |
3410 | drbd_info(device, "Last syncUUID did not get through, corrected:\n" ); |
3411 | drbd_uuid_dump(device, text: "self" , uuid: device->ldev->md.uuid, |
3412 | bits: device->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(device) : 0, flags: 0); |
3413 | |
3414 | return 1; |
3415 | } |
3416 | } |
3417 | |
3418 | |
3419 | *rule_nr = 80; |
3420 | peer = device->p_uuid[UI_CURRENT] & ~((u64)1); |
3421 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { |
3422 | self = device->ldev->md.uuid[i] & ~((u64)1); |
3423 | if (self == peer) |
3424 | return 2; |
3425 | } |
3426 | |
3427 | *rule_nr = 90; |
3428 | self = device->ldev->md.uuid[UI_BITMAP] & ~((u64)1); |
3429 | peer = device->p_uuid[UI_BITMAP] & ~((u64)1); |
3430 | if (self == peer && self != ((u64)0)) |
3431 | return 100; |
3432 | |
3433 | *rule_nr = 100; |
3434 | for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) { |
3435 | self = device->ldev->md.uuid[i] & ~((u64)1); |
3436 | for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) { |
3437 | peer = device->p_uuid[j] & ~((u64)1); |
3438 | if (self == peer) |
3439 | return -100; |
3440 | } |
3441 | } |
3442 | |
3443 | return -1000; |
3444 | } |
3445 | |
3446 | /* drbd_sync_handshake() returns the new conn state on success, or |
3447 | CONN_MASK (-1) on failure. |
3448 | */ |
3449 | static enum drbd_conns drbd_sync_handshake(struct drbd_peer_device *peer_device, |
3450 | enum drbd_role peer_role, |
3451 | enum drbd_disk_state peer_disk) __must_hold(local) |
3452 | { |
3453 | struct drbd_device *device = peer_device->device; |
3454 | enum drbd_conns rv = C_MASK; |
3455 | enum drbd_disk_state mydisk; |
3456 | struct net_conf *nc; |
3457 | int hg, rule_nr, rr_conflict, tentative, always_asbp; |
3458 | |
3459 | mydisk = device->state.disk; |
3460 | if (mydisk == D_NEGOTIATING) |
3461 | mydisk = device->new_state_tmp.disk; |
3462 | |
3463 | drbd_info(device, "drbd_sync_handshake:\n" ); |
3464 | |
3465 | spin_lock_irq(lock: &device->ldev->md.uuid_lock); |
3466 | drbd_uuid_dump(device, text: "self" , uuid: device->ldev->md.uuid, bits: device->comm_bm_set, flags: 0); |
3467 | drbd_uuid_dump(device, text: "peer" , uuid: device->p_uuid, |
3468 | bits: device->p_uuid[UI_SIZE], flags: device->p_uuid[UI_FLAGS]); |
3469 | |
3470 | hg = drbd_uuid_compare(peer_device, peer_role, rule_nr: &rule_nr); |
3471 | spin_unlock_irq(lock: &device->ldev->md.uuid_lock); |
3472 | |
3473 | drbd_info(device, "uuid_compare()=%d by rule %d\n" , hg, rule_nr); |
3474 | |
3475 | if (hg == -1000) { |
3476 | drbd_alert(device, "Unrelated data, aborting!\n" ); |
3477 | return C_MASK; |
3478 | } |
3479 | if (hg < -0x10000) { |
3480 | int proto, fflags; |
3481 | hg = -hg; |
3482 | proto = hg & 0xff; |
3483 | fflags = (hg >> 8) & 0xff; |
3484 | drbd_alert(device, "To resolve this both sides have to support at least protocol %d and feature flags 0x%x\n" , |
3485 | proto, fflags); |
3486 | return C_MASK; |
3487 | } |
3488 | if (hg < -1000) { |
3489 | drbd_alert(device, "To resolve this both sides have to support at least protocol %d\n" , -hg - 1000); |
3490 | return C_MASK; |
3491 | } |
3492 | |
3493 | if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) || |
3494 | (peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) { |
3495 | int f = (hg == -100) || abs(hg) == 2; |
3496 | hg = mydisk > D_INCONSISTENT ? 1 : -1; |
3497 | if (f) |
3498 | hg = hg*2; |
3499 | drbd_info(device, "Becoming sync %s due to disk states.\n" , |
3500 | hg > 0 ? "source" : "target" ); |
3501 | } |
3502 | |
3503 | if (abs(hg) == 100) |
3504 | drbd_khelper(device, cmd: "initial-split-brain" ); |
3505 | |
3506 | rcu_read_lock(); |
3507 | nc = rcu_dereference(peer_device->connection->net_conf); |
3508 | always_asbp = nc->always_asbp; |
3509 | rr_conflict = nc->rr_conflict; |
3510 | tentative = nc->tentative; |
3511 | rcu_read_unlock(); |
3512 | |
3513 | if (hg == 100 || (hg == -100 && always_asbp)) { |
3514 | int pcount = (device->state.role == R_PRIMARY) |
3515 | + (peer_role == R_PRIMARY); |
3516 | int forced = (hg == -100); |
3517 | |
3518 | switch (pcount) { |
3519 | case 0: |
3520 | hg = drbd_asb_recover_0p(peer_device); |
3521 | break; |
3522 | case 1: |
3523 | hg = drbd_asb_recover_1p(peer_device); |
3524 | break; |
3525 | case 2: |
3526 | hg = drbd_asb_recover_2p(peer_device); |
3527 | break; |
3528 | } |
3529 | if (abs(hg) < 100) { |
3530 | drbd_warn(device, "Split-Brain detected, %d primaries, " |
3531 | "automatically solved. Sync from %s node\n" , |
3532 | pcount, (hg < 0) ? "peer" : "this" ); |
3533 | if (forced) { |
3534 | drbd_warn(device, "Doing a full sync, since" |
3535 | " UUIDs where ambiguous.\n" ); |
3536 | hg = hg*2; |
3537 | } |
3538 | } |
3539 | } |
3540 | |
3541 | if (hg == -100) { |
3542 | if (test_bit(DISCARD_MY_DATA, &device->flags) && !(device->p_uuid[UI_FLAGS]&1)) |
3543 | hg = -1; |
3544 | if (!test_bit(DISCARD_MY_DATA, &device->flags) && (device->p_uuid[UI_FLAGS]&1)) |
3545 | hg = 1; |
3546 | |
3547 | if (abs(hg) < 100) |
3548 | drbd_warn(device, "Split-Brain detected, manually solved. " |
3549 | "Sync from %s node\n" , |
3550 | (hg < 0) ? "peer" : "this" ); |
3551 | } |
3552 | |
3553 | if (hg == -100) { |
3554 | /* FIXME this log message is not correct if we end up here |
3555 | * after an attempted attach on a diskless node. |
3556 | * We just refuse to attach -- well, we drop the "connection" |
3557 | * to that disk, in a way... */ |
3558 | drbd_alert(device, "Split-Brain detected but unresolved, dropping connection!\n" ); |
3559 | drbd_khelper(device, cmd: "split-brain" ); |
3560 | return C_MASK; |
3561 | } |
3562 | |
3563 | if (hg > 0 && mydisk <= D_INCONSISTENT) { |
3564 | drbd_err(device, "I shall become SyncSource, but I am inconsistent!\n" ); |
3565 | return C_MASK; |
3566 | } |
3567 | |
3568 | if (hg < 0 && /* by intention we do not use mydisk here. */ |
3569 | device->state.role == R_PRIMARY && device->state.disk >= D_CONSISTENT) { |
3570 | switch (rr_conflict) { |
3571 | case ASB_CALL_HELPER: |
3572 | drbd_khelper(device, cmd: "pri-lost" ); |
3573 | fallthrough; |
3574 | case ASB_DISCONNECT: |
3575 | drbd_err(device, "I shall become SyncTarget, but I am primary!\n" ); |
3576 | return C_MASK; |
3577 | case ASB_VIOLENTLY: |
3578 | drbd_warn(device, "Becoming SyncTarget, violating the stable-data" |
3579 | "assumption\n" ); |
3580 | } |
3581 | } |
3582 | |
3583 | if (tentative || test_bit(CONN_DRY_RUN, &peer_device->connection->flags)) { |
3584 | if (hg == 0) |
3585 | drbd_info(device, "dry-run connect: No resync, would become Connected immediately.\n" ); |
3586 | else |
3587 | drbd_info(device, "dry-run connect: Would become %s, doing a %s resync." , |
3588 | drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET), |
3589 | abs(hg) >= 2 ? "full" : "bit-map based" ); |
3590 | return C_MASK; |
3591 | } |
3592 | |
3593 | if (abs(hg) >= 2) { |
3594 | drbd_info(device, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n" ); |
3595 | if (drbd_bitmap_io(device, io_fn: &drbd_bmio_set_n_write, why: "set_n_write from sync_handshake" , |
3596 | flags: BM_LOCKED_SET_ALLOWED, NULL)) |
3597 | return C_MASK; |
3598 | } |
3599 | |
3600 | if (hg > 0) { /* become sync source. */ |
3601 | rv = C_WF_BITMAP_S; |
3602 | } else if (hg < 0) { /* become sync target */ |
3603 | rv = C_WF_BITMAP_T; |
3604 | } else { |
3605 | rv = C_CONNECTED; |
3606 | if (drbd_bm_total_weight(device)) { |
3607 | drbd_info(device, "No resync, but %lu bits in bitmap!\n" , |
3608 | drbd_bm_total_weight(device)); |
3609 | } |
3610 | } |
3611 | |
3612 | return rv; |
3613 | } |
3614 | |
3615 | static enum drbd_after_sb_p convert_after_sb(enum drbd_after_sb_p peer) |
3616 | { |
3617 | /* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */ |
3618 | if (peer == ASB_DISCARD_REMOTE) |
3619 | return ASB_DISCARD_LOCAL; |
3620 | |
3621 | /* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */ |
3622 | if (peer == ASB_DISCARD_LOCAL) |
3623 | return ASB_DISCARD_REMOTE; |
3624 | |
3625 | /* everything else is valid if they are equal on both sides. */ |
3626 | return peer; |
3627 | } |
3628 | |
3629 | static int receive_protocol(struct drbd_connection *connection, struct packet_info *pi) |
3630 | { |
3631 | struct p_protocol *p = pi->data; |
3632 | enum drbd_after_sb_p p_after_sb_0p, p_after_sb_1p, p_after_sb_2p; |
3633 | int p_proto, p_discard_my_data, p_two_primaries, cf; |
3634 | struct net_conf *nc, *old_net_conf, *new_net_conf = NULL; |
3635 | char integrity_alg[SHARED_SECRET_MAX] = "" ; |
3636 | struct crypto_shash *peer_integrity_tfm = NULL; |
3637 | void *int_dig_in = NULL, *int_dig_vv = NULL; |
3638 | |
3639 | p_proto = be32_to_cpu(p->protocol); |
3640 | p_after_sb_0p = be32_to_cpu(p->after_sb_0p); |
3641 | p_after_sb_1p = be32_to_cpu(p->after_sb_1p); |
3642 | p_after_sb_2p = be32_to_cpu(p->after_sb_2p); |
3643 | p_two_primaries = be32_to_cpu(p->two_primaries); |
3644 | cf = be32_to_cpu(p->conn_flags); |
3645 | p_discard_my_data = cf & CF_DISCARD_MY_DATA; |
3646 | |
3647 | if (connection->agreed_pro_version >= 87) { |
3648 | int err; |
3649 | |
3650 | if (pi->size > sizeof(integrity_alg)) |
3651 | return -EIO; |
3652 | err = drbd_recv_all(connection, buf: integrity_alg, size: pi->size); |
3653 | if (err) |
3654 | return err; |
3655 | integrity_alg[SHARED_SECRET_MAX - 1] = 0; |
3656 | } |
3657 | |
3658 | if (pi->cmd != P_PROTOCOL_UPDATE) { |
3659 | clear_bit(nr: CONN_DRY_RUN, addr: &connection->flags); |
3660 | |
3661 | if (cf & CF_DRY_RUN) |
3662 | set_bit(nr: CONN_DRY_RUN, addr: &connection->flags); |
3663 | |
3664 | rcu_read_lock(); |
3665 | nc = rcu_dereference(connection->net_conf); |
3666 | |
3667 | if (p_proto != nc->wire_protocol) { |
3668 | drbd_err(connection, "incompatible %s settings\n" , "protocol" ); |
3669 | goto disconnect_rcu_unlock; |
3670 | } |
3671 | |
3672 | if (convert_after_sb(peer: p_after_sb_0p) != nc->after_sb_0p) { |
3673 | drbd_err(connection, "incompatible %s settings\n" , "after-sb-0pri" ); |
3674 | goto disconnect_rcu_unlock; |
3675 | } |
3676 | |
3677 | if (convert_after_sb(peer: p_after_sb_1p) != nc->after_sb_1p) { |
3678 | drbd_err(connection, "incompatible %s settings\n" , "after-sb-1pri" ); |
3679 | goto disconnect_rcu_unlock; |
3680 | } |
3681 | |
3682 | if (convert_after_sb(peer: p_after_sb_2p) != nc->after_sb_2p) { |
3683 | drbd_err(connection, "incompatible %s settings\n" , "after-sb-2pri" ); |
3684 | goto disconnect_rcu_unlock; |
3685 | } |
3686 | |
3687 | if (p_discard_my_data && nc->discard_my_data) { |
3688 | drbd_err(connection, "incompatible %s settings\n" , "discard-my-data" ); |
3689 | goto disconnect_rcu_unlock; |
3690 | } |
3691 | |
3692 | if (p_two_primaries != nc->two_primaries) { |
3693 | drbd_err(connection, "incompatible %s settings\n" , "allow-two-primaries" ); |
3694 | goto disconnect_rcu_unlock; |
3695 | } |
3696 | |
3697 | if (strcmp(integrity_alg, nc->integrity_alg)) { |
3698 | drbd_err(connection, "incompatible %s settings\n" , "data-integrity-alg" ); |
3699 | goto disconnect_rcu_unlock; |
3700 | } |
3701 | |
3702 | rcu_read_unlock(); |
3703 | } |
3704 | |
3705 | if (integrity_alg[0]) { |
3706 | int hash_size; |
3707 | |
3708 | /* |
3709 | * We can only change the peer data integrity algorithm |
3710 | * here. Changing our own data integrity algorithm |
3711 | * requires that we send a P_PROTOCOL_UPDATE packet at |
3712 | * the same time; otherwise, the peer has no way to |
3713 | * tell between which packets the algorithm should |
3714 | * change. |
3715 | */ |
3716 | |
3717 | peer_integrity_tfm = crypto_alloc_shash(alg_name: integrity_alg, type: 0, mask: 0); |
3718 | if (IS_ERR(ptr: peer_integrity_tfm)) { |
3719 | peer_integrity_tfm = NULL; |
3720 | drbd_err(connection, "peer data-integrity-alg %s not supported\n" , |
3721 | integrity_alg); |
3722 | goto disconnect; |
3723 | } |
3724 | |
3725 | hash_size = crypto_shash_digestsize(tfm: peer_integrity_tfm); |
3726 | int_dig_in = kmalloc(size: hash_size, GFP_KERNEL); |
3727 | int_dig_vv = kmalloc(size: hash_size, GFP_KERNEL); |
3728 | if (!(int_dig_in && int_dig_vv)) { |
3729 | drbd_err(connection, "Allocation of buffers for data integrity checking failed\n" ); |
3730 | goto disconnect; |
3731 | } |
3732 | } |
3733 | |
3734 | new_net_conf = kmalloc(size: sizeof(struct net_conf), GFP_KERNEL); |
3735 | if (!new_net_conf) |
3736 | goto disconnect; |
3737 | |
3738 | mutex_lock(&connection->data.mutex); |
3739 | mutex_lock(&connection->resource->conf_update); |
3740 | old_net_conf = connection->net_conf; |
3741 | *new_net_conf = *old_net_conf; |
3742 | |
3743 | new_net_conf->wire_protocol = p_proto; |
3744 | new_net_conf->after_sb_0p = convert_after_sb(peer: p_after_sb_0p); |
3745 | new_net_conf->after_sb_1p = convert_after_sb(peer: p_after_sb_1p); |
3746 | new_net_conf->after_sb_2p = convert_after_sb(peer: p_after_sb_2p); |
3747 | new_net_conf->two_primaries = p_two_primaries; |
3748 | |
3749 | rcu_assign_pointer(connection->net_conf, new_net_conf); |
3750 | mutex_unlock(lock: &connection->resource->conf_update); |
3751 | mutex_unlock(lock: &connection->data.mutex); |
3752 | |
3753 | crypto_free_shash(tfm: connection->peer_integrity_tfm); |
3754 | kfree(objp: connection->int_dig_in); |
3755 | kfree(objp: connection->int_dig_vv); |
3756 | connection->peer_integrity_tfm = peer_integrity_tfm; |
3757 | connection->int_dig_in = int_dig_in; |
3758 | connection->int_dig_vv = int_dig_vv; |
3759 | |
3760 | if (strcmp(old_net_conf->integrity_alg, integrity_alg)) |
3761 | drbd_info(connection, "peer data-integrity-alg: %s\n" , |
3762 | integrity_alg[0] ? integrity_alg : "(none)" ); |
3763 | |
3764 | kvfree_rcu_mightsleep(old_net_conf); |
3765 | return 0; |
3766 | |
3767 | disconnect_rcu_unlock: |
3768 | rcu_read_unlock(); |
3769 | disconnect: |
3770 | crypto_free_shash(tfm: peer_integrity_tfm); |
3771 | kfree(objp: int_dig_in); |
3772 | kfree(objp: int_dig_vv); |
3773 | conn_request_state(connection, NS(conn, C_DISCONNECTING), flags: CS_HARD); |
3774 | return -EIO; |
3775 | } |
3776 | |
3777 | /* helper function |
3778 | * input: alg name, feature name |
3779 | * return: NULL (alg name was "") |
3780 | * ERR_PTR(error) if something goes wrong |
3781 | * or the crypto hash ptr, if it worked out ok. */ |
3782 | static struct crypto_shash *drbd_crypto_alloc_digest_safe( |
3783 | const struct drbd_device *device, |
3784 | const char *alg, const char *name) |
3785 | { |
3786 | struct crypto_shash *tfm; |
3787 | |
3788 | if (!alg[0]) |
3789 | return NULL; |
3790 | |
3791 | tfm = crypto_alloc_shash(alg_name: alg, type: 0, mask: 0); |
3792 | if (IS_ERR(ptr: tfm)) { |
3793 | drbd_err(device, "Can not allocate \"%s\" as %s (reason: %ld)\n" , |
3794 | alg, name, PTR_ERR(tfm)); |
3795 | return tfm; |
3796 | } |
3797 | return tfm; |
3798 | } |
3799 | |
3800 | static int ignore_remaining_packet(struct drbd_connection *connection, struct packet_info *pi) |
3801 | { |
3802 | void *buffer = connection->data.rbuf; |
3803 | int size = pi->size; |
3804 | |
3805 | while (size) { |
3806 | int s = min_t(int, size, DRBD_SOCKET_BUFFER_SIZE); |
3807 | s = drbd_recv(connection, buf: buffer, size: s); |
3808 | if (s <= 0) { |
3809 | if (s < 0) |
3810 | return s; |
3811 | break; |
3812 | } |
3813 | size -= s; |
3814 | } |
3815 | if (size) |
3816 | return -EIO; |
3817 | return 0; |
3818 | } |
3819 | |
3820 | /* |
3821 | * config_unknown_volume - device configuration command for unknown volume |
3822 | * |
3823 | * When a device is added to an existing connection, the node on which the |
3824 | * device is added first will send configuration commands to its peer but the |
3825 | * peer will not know about the device yet. It will warn and ignore these |
3826 | * commands. Once the device is added on the second node, the second node will |
3827 | * send the same device configuration commands, but in the other direction. |
3828 | * |
3829 | * (We can also end up here if drbd is misconfigured.) |
3830 | */ |
3831 | static int config_unknown_volume(struct drbd_connection *connection, struct packet_info *pi) |
3832 | { |
3833 | drbd_warn(connection, "%s packet received for volume %u, which is not configured locally\n" , |
3834 | cmdname(pi->cmd), pi->vnr); |
3835 | return ignore_remaining_packet(connection, pi); |
3836 | } |
3837 | |
3838 | static int receive_SyncParam(struct drbd_connection *connection, struct packet_info *pi) |
3839 | { |
3840 | struct drbd_peer_device *peer_device; |
3841 | struct drbd_device *device; |
3842 | struct p_rs_param_95 *p; |
3843 | unsigned int , data_size, exp_max_sz; |
3844 | struct crypto_shash *verify_tfm = NULL; |
3845 | struct crypto_shash *csums_tfm = NULL; |
3846 | struct net_conf *old_net_conf, *new_net_conf = NULL; |
3847 | struct disk_conf *old_disk_conf = NULL, *new_disk_conf = NULL; |
3848 | const int apv = connection->agreed_pro_version; |
3849 | struct fifo_buffer *old_plan = NULL, *new_plan = NULL; |
3850 | unsigned int fifo_size = 0; |
3851 | int err; |
3852 | |
3853 | peer_device = conn_peer_device(connection, volume_number: pi->vnr); |
3854 | if (!peer_device) |
3855 | return config_unknown_volume(connection, pi); |
3856 | device = peer_device->device; |
3857 | |
3858 | exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param) |
3859 | : apv == 88 ? sizeof(struct p_rs_param) |
3860 | + SHARED_SECRET_MAX |
3861 | : apv <= 94 ? sizeof(struct p_rs_param_89) |
3862 | : /* apv >= 95 */ sizeof(struct p_rs_param_95); |
3863 | |
3864 | if (pi->size > exp_max_sz) { |
3865 | drbd_err(device, "SyncParam packet too long: received %u, expected <= %u bytes\n" , |
3866 | pi->size, exp_max_sz); |
3867 | return -EIO; |
3868 | } |
3869 | |
3870 | if (apv <= 88) { |
3871 | header_size = sizeof(struct p_rs_param); |
3872 | data_size = pi->size - header_size; |
3873 | } else if (apv <= 94) { |
3874 | header_size = sizeof(struct p_rs_param_89); |
3875 | data_size = pi->size - header_size; |
3876 | D_ASSERT(device, data_size == 0); |
3877 | } else { |
3878 | header_size = sizeof(struct p_rs_param_95); |
3879 | data_size = pi->size - header_size; |
3880 | D_ASSERT(device, data_size == 0); |
3881 | } |
3882 | |
3883 | /* initialize verify_alg and csums_alg */ |
3884 | p = pi->data; |
3885 | BUILD_BUG_ON(sizeof(p->algs) != 2 * SHARED_SECRET_MAX); |
3886 | memset(&p->algs, 0, sizeof(p->algs)); |
3887 | |
3888 | err = drbd_recv_all(connection: peer_device->connection, buf: p, size: header_size); |
3889 | if (err) |
3890 | return err; |
3891 | |
3892 | mutex_lock(&connection->resource->conf_update); |
3893 | old_net_conf = peer_device->connection->net_conf; |
3894 | if (get_ldev(device)) { |
3895 | new_disk_conf = kzalloc(size: sizeof(struct disk_conf), GFP_KERNEL); |
3896 | if (!new_disk_conf) { |
3897 | put_ldev(device); |
3898 | mutex_unlock(lock: &connection->resource->conf_update); |
3899 | drbd_err(device, "Allocation of new disk_conf failed\n" ); |
3900 | return -ENOMEM; |
3901 | } |
3902 | |
3903 | old_disk_conf = device->ldev->disk_conf; |
3904 | *new_disk_conf = *old_disk_conf; |
3905 | |
3906 | new_disk_conf->resync_rate = be32_to_cpu(p->resync_rate); |
3907 | } |
3908 | |
3909 | if (apv >= 88) { |
3910 | if (apv == 88) { |
3911 | if (data_size > SHARED_SECRET_MAX || data_size == 0) { |
3912 | drbd_err(device, "verify-alg of wrong size, " |
3913 | "peer wants %u, accepting only up to %u byte\n" , |
3914 | data_size, SHARED_SECRET_MAX); |
3915 | goto reconnect; |
3916 | } |
3917 | |
3918 | err = drbd_recv_all(connection: peer_device->connection, buf: p->verify_alg, size: data_size); |
3919 | if (err) |
3920 | goto reconnect; |
3921 | /* we expect NUL terminated string */ |
3922 | /* but just in case someone tries to be evil */ |
3923 | D_ASSERT(device, p->verify_alg[data_size-1] == 0); |
3924 | p->verify_alg[data_size-1] = 0; |
3925 | |
3926 | } else /* apv >= 89 */ { |
3927 | /* we still expect NUL terminated strings */ |
3928 | /* but just in case someone tries to be evil */ |
3929 | D_ASSERT(device, p->verify_alg[SHARED_SECRET_MAX-1] == 0); |
3930 | D_ASSERT(device, p->csums_alg[SHARED_SECRET_MAX-1] == 0); |
3931 | p->verify_alg[SHARED_SECRET_MAX-1] = 0; |
3932 | p->csums_alg[SHARED_SECRET_MAX-1] = 0; |
3933 | } |
3934 | |
3935 | if (strcmp(old_net_conf->verify_alg, p->verify_alg)) { |
3936 | if (device->state.conn == C_WF_REPORT_PARAMS) { |
3937 | drbd_err(device, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n" , |
3938 | old_net_conf->verify_alg, p->verify_alg); |
3939 | goto disconnect; |
3940 | } |
3941 | verify_tfm = drbd_crypto_alloc_digest_safe(device, |
3942 | alg: p->verify_alg, name: "verify-alg" ); |
3943 | if (IS_ERR(ptr: verify_tfm)) { |
3944 | verify_tfm = NULL; |
3945 | goto disconnect; |
3946 | } |
3947 | } |
3948 | |
3949 | if (apv >= 89 && strcmp(old_net_conf->csums_alg, p->csums_alg)) { |
3950 | if (device->state.conn == C_WF_REPORT_PARAMS) { |
3951 | drbd_err(device, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n" , |
3952 | old_net_conf->csums_alg, p->csums_alg); |
3953 | goto disconnect; |
3954 | } |
3955 | csums_tfm = drbd_crypto_alloc_digest_safe(device, |
3956 | alg: p->csums_alg, name: "csums-alg" ); |
3957 | if (IS_ERR(ptr: csums_tfm)) { |
3958 | csums_tfm = NULL; |
3959 | goto disconnect; |
3960 | } |
3961 | } |
3962 | |
3963 | if (apv > 94 && new_disk_conf) { |
3964 | new_disk_conf->c_plan_ahead = be32_to_cpu(p->c_plan_ahead); |
3965 | new_disk_conf->c_delay_target = be32_to_cpu(p->c_delay_target); |
3966 | new_disk_conf->c_fill_target = be32_to_cpu(p->c_fill_target); |
3967 | new_disk_conf->c_max_rate = be32_to_cpu(p->c_max_rate); |
3968 | |
3969 | fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ; |
3970 | if (fifo_size != device->rs_plan_s->size) { |
3971 | new_plan = fifo_alloc(fifo_size); |
3972 | if (!new_plan) { |
3973 | drbd_err(device, "kmalloc of fifo_buffer failed" ); |
3974 | put_ldev(device); |
3975 | goto disconnect; |
3976 | } |
3977 | } |
3978 | } |
3979 | |
3980 | if (verify_tfm || csums_tfm) { |
3981 | new_net_conf = kzalloc(size: sizeof(struct net_conf), GFP_KERNEL); |
3982 | if (!new_net_conf) |
3983 | goto disconnect; |
3984 | |
3985 | *new_net_conf = *old_net_conf; |
3986 | |
3987 | if (verify_tfm) { |
3988 | strcpy(p: new_net_conf->verify_alg, q: p->verify_alg); |
3989 | new_net_conf->verify_alg_len = strlen(p->verify_alg) + 1; |
3990 | crypto_free_shash(tfm: peer_device->connection->verify_tfm); |
3991 | peer_device->connection->verify_tfm = verify_tfm; |
3992 | drbd_info(device, "using verify-alg: \"%s\"\n" , p->verify_alg); |
3993 | } |
3994 | if (csums_tfm) { |
3995 | strcpy(p: new_net_conf->csums_alg, q: p->csums_alg); |
3996 | new_net_conf->csums_alg_len = strlen(p->csums_alg) + 1; |
3997 | crypto_free_shash(tfm: peer_device->connection->csums_tfm); |
3998 | peer_device->connection->csums_tfm = csums_tfm; |
3999 | drbd_info(device, "using csums-alg: \"%s\"\n" , p->csums_alg); |
4000 | } |
4001 | rcu_assign_pointer(connection->net_conf, new_net_conf); |
4002 | } |
4003 | } |
4004 | |
4005 | if (new_disk_conf) { |
4006 | rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf); |
4007 | put_ldev(device); |
4008 | } |
4009 | |
4010 | if (new_plan) { |
4011 | old_plan = device->rs_plan_s; |
4012 | rcu_assign_pointer(device->rs_plan_s, new_plan); |
4013 | } |
4014 | |
4015 | mutex_unlock(lock: &connection->resource->conf_update); |
4016 | synchronize_rcu(); |
4017 | if (new_net_conf) |
4018 | kfree(objp: old_net_conf); |
4019 | kfree(objp: old_disk_conf); |
4020 | kfree(objp: old_plan); |
4021 | |
4022 | return 0; |
4023 | |
4024 | reconnect: |
4025 | if (new_disk_conf) { |
4026 | put_ldev(device); |
4027 | kfree(objp: new_disk_conf); |
4028 | } |
4029 | mutex_unlock(lock: &connection->resource->conf_update); |
4030 | return -EIO; |
4031 | |
4032 | disconnect: |
4033 | kfree(objp: new_plan); |
4034 | if (new_disk_conf) { |
4035 | put_ldev(device); |
4036 | kfree(objp: new_disk_conf); |
4037 | } |
4038 | mutex_unlock(lock: &connection->resource->conf_update); |
4039 | /* just for completeness: actually not needed, |
4040 | * as this is not reached if csums_tfm was ok. */ |
4041 | crypto_free_shash(tfm: csums_tfm); |
4042 | /* but free the verify_tfm again, if csums_tfm did not work out */ |
4043 | crypto_free_shash(tfm: verify_tfm); |
4044 | conn_request_state(connection: peer_device->connection, NS(conn, C_DISCONNECTING), flags: CS_HARD); |
4045 | return -EIO; |
4046 | } |
4047 | |
4048 | /* warn if the arguments differ by more than 12.5% */ |
4049 | static void warn_if_differ_considerably(struct drbd_device *device, |
4050 | const char *s, sector_t a, sector_t b) |
4051 | { |
4052 | sector_t d; |
4053 | if (a == 0 || b == 0) |
4054 | return; |
4055 | d = (a > b) ? (a - b) : (b - a); |
4056 | if (d > (a>>3) || d > (b>>3)) |
4057 | drbd_warn(device, "Considerable difference in %s: %llus vs. %llus\n" , s, |
4058 | (unsigned long long)a, (unsigned long long)b); |
4059 | } |
4060 | |
4061 | static int receive_sizes(struct drbd_connection *connection, struct packet_info *pi) |
4062 | { |
4063 | struct drbd_peer_device *peer_device; |
4064 | struct drbd_device *device; |
4065 | struct p_sizes *p = pi->data; |
4066 | struct o_qlim *o = (connection->agreed_features & DRBD_FF_WSAME) ? p->qlim : NULL; |
4067 | enum determine_dev_size dd = DS_UNCHANGED; |
4068 | sector_t p_size, p_usize, p_csize, my_usize; |
4069 | sector_t new_size, cur_size; |
4070 | int ldsc = 0; /* local disk size changed */ |
4071 | enum dds_flags ddsf; |
4072 | |
4073 | peer_device = conn_peer_device(connection, volume_number: pi->vnr); |
4074 | if (!peer_device) |
4075 | return config_unknown_volume(connection, pi); |
4076 | device = peer_device->device; |
4077 | cur_size = get_capacity(disk: device->vdisk); |
4078 | |
4079 | p_size = be64_to_cpu(p->d_size); |
4080 | p_usize = be64_to_cpu(p->u_size); |
4081 | p_csize = be64_to_cpu(p->c_size); |
4082 | |
4083 | /* just store the peer's disk size for now. |
4084 | * we still need to figure out whether we accept that. */ |
4085 | device->p_size = p_size; |
4086 | |
4087 | if (get_ldev(device)) { |
4088 | rcu_read_lock(); |
4089 | my_usize = rcu_dereference(device->ldev->disk_conf)->disk_size; |
4090 | rcu_read_unlock(); |
4091 | |
4092 | warn_if_differ_considerably(device, s: "lower level device sizes" , |
4093 | a: p_size, b: drbd_get_max_capacity(bdev: device->ldev)); |
4094 | warn_if_differ_considerably(device, s: "user requested size" , |
4095 | a: p_usize, b: my_usize); |
4096 | |
4097 | /* if this is the first connect, or an otherwise expected |
4098 | * param exchange, choose the minimum */ |
4099 | if (device->state.conn == C_WF_REPORT_PARAMS) |
4100 | p_usize = min_not_zero(my_usize, p_usize); |
4101 | |
4102 | /* Never shrink a device with usable data during connect, |
4103 | * or "attach" on the peer. |
4104 | * But allow online shrinking if we are connected. */ |
4105 | new_size = drbd_new_dev_size(device, device->ldev, p_usize, 0); |
4106 | if (new_size < cur_size && |
4107 | device->state.disk >= D_OUTDATED && |
4108 | (device->state.conn < C_CONNECTED || device->state.pdsk == D_DISKLESS)) { |
4109 | drbd_err(device, "The peer's disk size is too small! (%llu < %llu sectors)\n" , |
4110 | (unsigned long long)new_size, (unsigned long long)cur_size); |
4111 | conn_request_state(connection: peer_device->connection, NS(conn, C_DISCONNECTING), flags: CS_HARD); |
4112 | put_ldev(device); |
4113 | return -EIO; |
4114 | } |
4115 | |
4116 | if (my_usize != p_usize) { |
4117 | struct disk_conf *old_disk_conf, *new_disk_conf = NULL; |
4118 | |
4119 | new_disk_conf = kzalloc(size: sizeof(struct disk_conf), GFP_KERNEL); |
4120 | if (!new_disk_conf) { |
4121 | put_ldev(device); |
4122 | return -ENOMEM; |
4123 | } |
4124 | |
4125 | mutex_lock(&connection->resource->conf_update); |
4126 | old_disk_conf = device->ldev->disk_conf; |
4127 | *new_disk_conf = *old_disk_conf; |
4128 | new_disk_conf->disk_size = p_usize; |
4129 | |
4130 | rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf); |
4131 | mutex_unlock(lock: &connection->resource->conf_update); |
4132 | kvfree_rcu_mightsleep(old_disk_conf); |
4133 | |
4134 | drbd_info(device, "Peer sets u_size to %lu sectors (old: %lu)\n" , |
4135 | (unsigned long)p_usize, (unsigned long)my_usize); |
4136 | } |
4137 | |
4138 | put_ldev(device); |
4139 | } |
4140 | |
4141 | device->peer_max_bio_size = be32_to_cpu(p->max_bio_size); |
4142 | /* Leave drbd_reconsider_queue_parameters() before drbd_determine_dev_size(). |
4143 | In case we cleared the QUEUE_FLAG_DISCARD from our queue in |
4144 | drbd_reconsider_queue_parameters(), we can be sure that after |
4145 | drbd_determine_dev_size() no REQ_DISCARDs are in the queue. */ |
4146 | |
4147 | ddsf = be16_to_cpu(p->dds_flags); |
4148 | if (get_ldev(device)) { |
4149 | drbd_reconsider_queue_parameters(device, bdev: device->ldev, o); |
4150 | dd = drbd_determine_dev_size(device, ddsf, NULL); |
4151 | put_ldev(device); |
4152 | if (dd == DS_ERROR) |
4153 | return -EIO; |
4154 | drbd_md_sync(device); |
4155 | } else { |
4156 | /* |
4157 | * I am diskless, need to accept the peer's *current* size. |
4158 | * I must NOT accept the peers backing disk size, |
4159 | * it may have been larger than mine all along... |
4160 | * |
4161 | * At this point, the peer knows more about my disk, or at |
4162 | * least about what we last agreed upon, than myself. |
4163 | * So if his c_size is less than his d_size, the most likely |
4164 | * reason is that *my* d_size was smaller last time we checked. |
4165 | * |
4166 | * However, if he sends a zero current size, |
4167 | * take his (user-capped or) backing disk size anyways. |
4168 | * |
4169 | * Unless of course he does not have a disk himself. |
4170 | * In which case we ignore this completely. |
4171 | */ |
4172 | sector_t new_size = p_csize ?: p_usize ?: p_size; |
4173 | drbd_reconsider_queue_parameters(device, NULL, o); |
4174 | if (new_size == 0) { |
4175 | /* Ignore, peer does not know nothing. */ |
4176 | } else if (new_size == cur_size) { |
4177 | /* nothing to do */ |
4178 | } else if (cur_size != 0 && p_size == 0) { |
4179 | drbd_warn(device, "Ignored diskless peer device size (peer:%llu != me:%llu sectors)!\n" , |
4180 | (unsigned long long)new_size, (unsigned long long)cur_size); |
4181 | } else if (new_size < cur_size && device->state.role == R_PRIMARY) { |
4182 | drbd_err(device, "The peer's device size is too small! (%llu < %llu sectors); demote me first!\n" , |
4183 | (unsigned long long)new_size, (unsigned long long)cur_size); |
4184 | conn_request_state(connection: peer_device->connection, NS(conn, C_DISCONNECTING), flags: CS_HARD); |
4185 | return -EIO; |
4186 | } else { |
4187 | /* I believe the peer, if |
4188 | * - I don't have a current size myself |
4189 | * - we agree on the size anyways |
4190 | * - I do have a current size, am Secondary, |
4191 | * and he has the only disk |
4192 | * - I do have a current size, am Primary, |
4193 | * and he has the only disk, |
4194 | * which is larger than my current size |
4195 | */ |
4196 | drbd_set_my_capacity(device, size: new_size); |
4197 | } |
4198 | } |
4199 | |
4200 | if (get_ldev(device)) { |
4201 | if (device->ldev->known_size != drbd_get_capacity(bdev: device->ldev->backing_bdev)) { |
4202 | device->ldev->known_size = drbd_get_capacity(bdev: device->ldev->backing_bdev); |
4203 | ldsc = 1; |
4204 | } |
4205 | |
4206 | put_ldev(device); |
4207 | } |
4208 | |
4209 | if (device->state.conn > C_WF_REPORT_PARAMS) { |
4210 | if (be64_to_cpu(p->c_size) != get_capacity(disk: device->vdisk) || |
4211 | ldsc) { |
4212 | /* we have different sizes, probably peer |
4213 | * needs to know my new size... */ |
4214 | drbd_send_sizes(peer_device, trigger_reply: 0, flags: ddsf); |
4215 | } |
4216 | if (test_and_clear_bit(nr: RESIZE_PENDING, addr: &device->flags) || |
4217 | (dd == DS_GREW && device->state.conn == C_CONNECTED)) { |
4218 | if (device->state.pdsk >= D_INCONSISTENT && |
4219 | device->state.disk >= D_INCONSISTENT) { |
4220 | if (ddsf & DDSF_NO_RESYNC) |
4221 | drbd_info(device, "Resync of new storage suppressed with --assume-clean\n" ); |
4222 | else |
4223 | resync_after_online_grow(device); |
4224 | } else |
4225 | set_bit(nr: RESYNC_AFTER_NEG, addr: &device->flags); |
4226 | } |
4227 | } |
4228 | |
4229 | return 0; |
4230 | } |
4231 | |
4232 | static int receive_uuids(struct drbd_connection *connection, struct packet_info *pi) |
4233 | { |
4234 | struct drbd_peer_device *peer_device; |
4235 | struct drbd_device *device; |
4236 | struct p_uuids *p = pi->data; |
4237 | u64 *p_uuid; |
4238 | int i, updated_uuids = 0; |
4239 | |
4240 | peer_device = conn_peer_device(connection, volume_number: pi->vnr); |
4241 | if (!peer_device) |
4242 | return config_unknown_volume(connection, pi); |
4243 | device = peer_device->device; |
4244 | |
4245 | p_uuid = kmalloc_array(n: UI_EXTENDED_SIZE, size: sizeof(*p_uuid), GFP_NOIO); |
4246 | if (!p_uuid) |
4247 | return false; |
4248 | |
4249 | for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++) |
4250 | p_uuid[i] = be64_to_cpu(p->uuid[i]); |
4251 | |
4252 | kfree(objp: device->p_uuid); |
4253 | device->p_uuid = p_uuid; |
4254 | |
4255 | if ((device->state.conn < C_CONNECTED || device->state.pdsk == D_DISKLESS) && |
4256 | device->state.disk < D_INCONSISTENT && |
4257 | device->state.role == R_PRIMARY && |
4258 | (device->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) { |
4259 | drbd_err(device, "Can only connect to data with current UUID=%016llX\n" , |
4260 | (unsigned long long)device->ed_uuid); |
4261 | conn_request_state(connection: peer_device->connection, NS(conn, C_DISCONNECTING), flags: CS_HARD); |
4262 | return -EIO; |
4263 | } |
4264 | |
4265 | if (get_ldev(device)) { |
4266 | int skip_initial_sync = |
4267 | device->state.conn == C_CONNECTED && |
4268 | peer_device->connection->agreed_pro_version >= 90 && |
4269 | device->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && |
4270 | (p_uuid[UI_FLAGS] & 8); |
4271 | if (skip_initial_sync) { |
4272 | drbd_info(device, "Accepted new current UUID, preparing to skip initial sync\n" ); |
4273 | drbd_bitmap_io(device, io_fn: &drbd_bmio_clear_n_write, |
4274 | why: "clear_n_write from receive_uuids" , |
4275 | flags: BM_LOCKED_TEST_ALLOWED, NULL); |
4276 | _drbd_uuid_set(device, idx: UI_CURRENT, val: p_uuid[UI_CURRENT]); |
4277 | _drbd_uuid_set(device, idx: UI_BITMAP, val: 0); |
4278 | _drbd_set_state(_NS2(device, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), |
4279 | CS_VERBOSE, NULL); |
4280 | drbd_md_sync(device); |
4281 | updated_uuids = 1; |
4282 | } |
4283 | put_ldev(device); |
4284 | } else if (device->state.disk < D_INCONSISTENT && |
4285 | device->state.role == R_PRIMARY) { |
4286 | /* I am a diskless primary, the peer just created a new current UUID |
4287 | for me. */ |
4288 | updated_uuids = drbd_set_ed_uuid(device, val: p_uuid[UI_CURRENT]); |
4289 | } |
4290 | |
4291 | /* Before we test for the disk state, we should wait until an eventually |
4292 | ongoing cluster wide state change is finished. That is important if |
4293 | we are primary and are detaching from our disk. We need to see the |
4294 | new disk state... */ |
4295 | mutex_lock(device->state_mutex); |
4296 | mutex_unlock(lock: device->state_mutex); |
4297 | if (device->state.conn >= C_CONNECTED && device->state.disk < D_INCONSISTENT) |
4298 | updated_uuids |= drbd_set_ed_uuid(device, val: p_uuid[UI_CURRENT]); |
4299 | |
4300 | if (updated_uuids) |
4301 | drbd_print_uuids(device, text: "receiver updated UUIDs to" ); |
4302 | |
4303 | return 0; |
4304 | } |
4305 | |
4306 | /** |
4307 | * convert_state() - Converts the peer's view of the cluster state to our point of view |
4308 | * @ps: The state as seen by the peer. |
4309 | */ |
4310 | static union drbd_state convert_state(union drbd_state ps) |
4311 | { |
4312 | union drbd_state ms; |
4313 | |
4314 | static enum drbd_conns c_tab[] = { |
4315 | [C_WF_REPORT_PARAMS] = C_WF_REPORT_PARAMS, |
4316 | [C_CONNECTED] = C_CONNECTED, |
4317 | |
4318 | [C_STARTING_SYNC_S] = C_STARTING_SYNC_T, |
4319 | [C_STARTING_SYNC_T] = C_STARTING_SYNC_S, |
4320 | [C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */ |
4321 | [C_VERIFY_S] = C_VERIFY_T, |
4322 | [C_MASK] = C_MASK, |
4323 | }; |
4324 | |
4325 | ms.i = ps.i; |
4326 | |
4327 | ms.conn = c_tab[ps.conn]; |
4328 | ms.peer = ps.role; |
4329 | ms.role = ps.peer; |
4330 | ms.pdsk = ps.disk; |
4331 | ms.disk = ps.pdsk; |
4332 | ms.peer_isp = (ps.aftr_isp | ps.user_isp); |
4333 | |
4334 | return ms; |
4335 | } |
4336 | |
4337 | static int receive_req_state(struct drbd_connection *connection, struct packet_info *pi) |
4338 | { |
4339 | struct drbd_peer_device *peer_device; |
4340 | struct drbd_device *device; |
4341 | struct p_req_state *p = pi->data; |
4342 | union drbd_state mask, val; |
4343 | enum drbd_state_rv rv; |
4344 | |
4345 | peer_device = conn_peer_device(connection, volume_number: pi->vnr); |
4346 | if (!peer_device) |
4347 | return -EIO; |
4348 | device = peer_device->device; |
4349 | |
4350 | mask.i = be32_to_cpu(p->mask); |
4351 | val.i = be32_to_cpu(p->val); |
4352 | |
4353 | if (test_bit(RESOLVE_CONFLICTS, &peer_device->connection->flags) && |
4354 | mutex_is_locked(lock: device->state_mutex)) { |
4355 | drbd_send_sr_reply(peer_device, retcode: SS_CONCURRENT_ST_CHG); |
4356 | return 0; |
4357 | } |
4358 | |
4359 | mask = convert_state(ps: mask); |
4360 | val = convert_state(ps: val); |
4361 | |
4362 | rv = drbd_change_state(device, f: CS_VERBOSE, mask, val); |
4363 | drbd_send_sr_reply(peer_device, retcode: rv); |
4364 | |
4365 | drbd_md_sync(device); |
4366 | |
4367 | return 0; |
4368 | } |
4369 | |
4370 | static int receive_req_conn_state(struct drbd_connection *connection, struct packet_info *pi) |
4371 | { |
4372 | struct p_req_state *p = pi->data; |
4373 | union drbd_state mask, val; |
4374 | enum drbd_state_rv rv; |
4375 | |
4376 | mask.i = be32_to_cpu(p->mask); |
4377 | val.i = be32_to_cpu(p->val); |
4378 | |
4379 | if (test_bit(RESOLVE_CONFLICTS, &connection->flags) && |
4380 | mutex_is_locked(lock: &connection->cstate_mutex)) { |
4381 | conn_send_sr_reply(connection, retcode: SS_CONCURRENT_ST_CHG); |
4382 | return 0; |
4383 | } |
4384 | |
4385 | mask = convert_state(ps: mask); |
4386 | val = convert_state(ps: val); |
4387 | |
4388 | rv = conn_request_state(connection, mask, val, flags: CS_VERBOSE | CS_LOCAL_ONLY | CS_IGN_OUTD_FAIL); |
4389 | conn_send_sr_reply(connection, retcode: rv); |
4390 | |
4391 | return 0; |
4392 | } |
4393 | |
4394 | static int receive_state(struct drbd_connection *connection, struct packet_info *pi) |
4395 | { |
4396 | struct drbd_peer_device *peer_device; |
4397 | struct drbd_device *device; |
4398 | struct p_state *p = pi->data; |
4399 | union drbd_state os, ns, peer_state; |
4400 | enum drbd_disk_state real_peer_disk; |
4401 | enum chg_state_flags cs_flags; |
4402 | int rv; |
4403 | |
4404 | peer_device = conn_peer_device(connection, volume_number: pi->vnr); |
4405 | if (!peer_device) |
4406 | return config_unknown_volume(connection, pi); |
4407 | device = peer_device->device; |
4408 | |
4409 | peer_state.i = be32_to_cpu(p->state); |
4410 | |
4411 | real_peer_disk = peer_state.disk; |
4412 | if (peer_state.disk == D_NEGOTIATING) { |
4413 | real_peer_disk = device->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT; |
4414 | drbd_info(device, "real peer disk state = %s\n" , drbd_disk_str(real_peer_disk)); |
4415 | } |
4416 | |
4417 | spin_lock_irq(lock: &device->resource->req_lock); |
4418 | retry: |
4419 | os = ns = drbd_read_state(device); |
4420 | spin_unlock_irq(lock: &device->resource->req_lock); |
4421 | |
4422 | /* If some other part of the code (ack_receiver thread, timeout) |
4423 | * already decided to close the connection again, |
4424 | * we must not "re-establish" it here. */ |
4425 | if (os.conn <= C_TEAR_DOWN) |
4426 | return -ECONNRESET; |
4427 | |
4428 | /* If this is the "end of sync" confirmation, usually the peer disk |
4429 | * transitions from D_INCONSISTENT to D_UP_TO_DATE. For empty (0 bits |
4430 | * set) resync started in PausedSyncT, or if the timing of pause-/ |
4431 | * unpause-sync events has been "just right", the peer disk may |
4432 | * transition from D_CONSISTENT to D_UP_TO_DATE as well. |
4433 | */ |
4434 | if ((os.pdsk == D_INCONSISTENT || os.pdsk == D_CONSISTENT) && |
4435 | real_peer_disk == D_UP_TO_DATE && |
4436 | os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) { |
4437 | /* If we are (becoming) SyncSource, but peer is still in sync |
4438 | * preparation, ignore its uptodate-ness to avoid flapping, it |
4439 | * will change to inconsistent once the peer reaches active |
4440 | * syncing states. |
4441 | * It may have changed syncer-paused flags, however, so we |
4442 | * cannot ignore this completely. */ |
4443 | if (peer_state.conn > C_CONNECTED && |
4444 | peer_state.conn < C_SYNC_SOURCE) |
4445 | real_peer_disk = D_INCONSISTENT; |
4446 | |
4447 | /* if peer_state changes to connected at the same time, |
4448 | * it explicitly notifies us that it finished resync. |
4449 | * Maybe we should finish it up, too? */ |
4450 | else if (os.conn >= C_SYNC_SOURCE && |
4451 | peer_state.conn == C_CONNECTED) { |
4452 | if (drbd_bm_total_weight(device) <= device->rs_failed) |
4453 | drbd_resync_finished(peer_device); |
4454 | return 0; |
4455 | } |
4456 | } |
4457 | |
4458 | /* explicit verify finished notification, stop sector reached. */ |
4459 | if (os.conn == C_VERIFY_T && os.disk == D_UP_TO_DATE && |
4460 | peer_state.conn == C_CONNECTED && real_peer_disk == D_UP_TO_DATE) { |
4461 | ov_out_of_sync_print(peer_device); |
4462 | drbd_resync_finished(peer_device); |
4463 | return 0; |
4464 | } |
4465 | |
4466 | /* peer says his disk is inconsistent, while we think it is uptodate, |
4467 | * and this happens while the peer still thinks we have a sync going on, |
4468 | * but we think we are already done with the sync. |
4469 | * We ignore this to avoid flapping pdsk. |
4470 | * This should not happen, if the peer is a recent version of drbd. */ |
4471 | if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT && |
4472 | os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE) |
4473 | real_peer_disk = D_UP_TO_DATE; |
4474 | |
4475 | if (ns.conn == C_WF_REPORT_PARAMS) |
4476 | ns.conn = C_CONNECTED; |
4477 | |
4478 | if (peer_state.conn == C_AHEAD) |
4479 | ns.conn = C_BEHIND; |
4480 | |
4481 | /* TODO: |
4482 | * if (primary and diskless and peer uuid != effective uuid) |
4483 | * abort attach on peer; |
4484 | * |
4485 | * If this node does not have good data, was already connected, but |
4486 | * the peer did a late attach only now, trying to "negotiate" with me, |
4487 | * AND I am currently Primary, possibly frozen, with some specific |
4488 | * "effective" uuid, this should never be reached, really, because |
4489 | * we first send the uuids, then the current state. |
4490 | * |
4491 | * In this scenario, we already dropped the connection hard |
4492 | * when we received the unsuitable uuids (receive_uuids(). |
4493 | * |
4494 | * Should we want to change this, that is: not drop the connection in |
4495 | * receive_uuids() already, then we would need to add a branch here |
4496 | * that aborts the attach of "unsuitable uuids" on the peer in case |
4497 | * this node is currently Diskless Primary. |
4498 | */ |
4499 | |
4500 | if (device->p_uuid && peer_state.disk >= D_NEGOTIATING && |
4501 | get_ldev_if_state(device, D_NEGOTIATING)) { |
4502 | int cr; /* consider resync */ |
4503 | |
4504 | /* if we established a new connection */ |
4505 | cr = (os.conn < C_CONNECTED); |
4506 | /* if we had an established connection |
4507 | * and one of the nodes newly attaches a disk */ |
4508 | cr |= (os.conn == C_CONNECTED && |
4509 | (peer_state.disk == D_NEGOTIATING || |
4510 | os.disk == D_NEGOTIATING)); |
4511 | /* if we have both been inconsistent, and the peer has been |
4512 | * forced to be UpToDate with --force */ |
4513 | cr |= test_bit(CONSIDER_RESYNC, &device->flags); |
4514 | /* if we had been plain connected, and the admin requested to |
4515 | * start a sync by "invalidate" or "invalidate-remote" */ |
4516 | cr |= (os.conn == C_CONNECTED && |
4517 | (peer_state.conn >= C_STARTING_SYNC_S && |
4518 | peer_state.conn <= C_WF_BITMAP_T)); |
4519 | |
4520 | if (cr) |
4521 | ns.conn = drbd_sync_handshake(peer_device, peer_role: peer_state.role, peer_disk: real_peer_disk); |
4522 | |
4523 | put_ldev(device); |
4524 | if (ns.conn == C_MASK) { |
4525 | ns.conn = C_CONNECTED; |
4526 | if (device->state.disk == D_NEGOTIATING) { |
4527 | drbd_force_state(device, NS(disk, D_FAILED)); |
4528 | } else if (peer_state.disk == D_NEGOTIATING) { |
4529 | drbd_err(device, "Disk attach process on the peer node was aborted.\n" ); |
4530 | peer_state.disk = D_DISKLESS; |
4531 | real_peer_disk = D_DISKLESS; |
4532 | } else { |
4533 | if (test_and_clear_bit(nr: CONN_DRY_RUN, addr: &peer_device->connection->flags)) |
4534 | return -EIO; |
4535 | D_ASSERT(device, os.conn == C_WF_REPORT_PARAMS); |
4536 | conn_request_state(connection: peer_device->connection, NS(conn, C_DISCONNECTING), flags: CS_HARD); |
4537 | return -EIO; |
4538 | } |
4539 | } |
4540 | } |
4541 | |
4542 | spin_lock_irq(lock: &device->resource->req_lock); |
4543 | if (os.i != drbd_read_state(device).i) |
4544 | goto retry; |
4545 | clear_bit(nr: CONSIDER_RESYNC, addr: &device->flags); |
4546 | ns.peer = peer_state.role; |
4547 | ns.pdsk = real_peer_disk; |
4548 | ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp); |
4549 | if ((ns.conn == C_CONNECTED || ns.conn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING) |
4550 | ns.disk = device->new_state_tmp.disk; |
4551 | cs_flags = CS_VERBOSE + (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED ? 0 : CS_HARD); |
4552 | if (ns.pdsk == D_CONSISTENT && drbd_suspended(device) && ns.conn == C_CONNECTED && os.conn < C_CONNECTED && |
4553 | test_bit(NEW_CUR_UUID, &device->flags)) { |
4554 | /* Do not allow tl_restart(RESEND) for a rebooted peer. We can only allow this |
4555 | for temporal network outages! */ |
4556 | spin_unlock_irq(lock: &device->resource->req_lock); |
4557 | drbd_err(device, "Aborting Connect, can not thaw IO with an only Consistent peer\n" ); |
4558 | tl_clear(peer_device->connection); |
4559 | drbd_uuid_new_current(device); |
4560 | clear_bit(nr: NEW_CUR_UUID, addr: &device->flags); |
4561 | conn_request_state(connection: peer_device->connection, NS2(conn, C_PROTOCOL_ERROR, susp, 0), flags: CS_HARD); |
4562 | return -EIO; |
4563 | } |
4564 | rv = _drbd_set_state(device, ns, cs_flags, NULL); |
4565 | ns = drbd_read_state(device); |
4566 | spin_unlock_irq(lock: &device->resource->req_lock); |
4567 | |
4568 | if (rv < SS_SUCCESS) { |
4569 | conn_request_state(connection: peer_device->connection, NS(conn, C_DISCONNECTING), flags: CS_HARD); |
4570 | return -EIO; |
4571 | } |
4572 | |
4573 | if (os.conn > C_WF_REPORT_PARAMS) { |
4574 | if (ns.conn > C_CONNECTED && peer_state.conn <= C_CONNECTED && |
4575 | peer_state.disk != D_NEGOTIATING ) { |
4576 | /* we want resync, peer has not yet decided to sync... */ |
4577 | /* Nowadays only used when forcing a node into primary role and |
4578 | setting its disk to UpToDate with that */ |
4579 | drbd_send_uuids(peer_device); |
4580 | drbd_send_current_state(peer_device); |
4581 | } |
4582 | } |
4583 | |
4584 | clear_bit(nr: DISCARD_MY_DATA, addr: &device->flags); |
4585 | |
4586 | drbd_md_sync(device); /* update connected indicator, la_size_sect, ... */ |
4587 | |
4588 | return 0; |
4589 | } |
4590 | |
4591 | static int receive_sync_uuid(struct drbd_connection *connection, struct packet_info *pi) |
4592 | { |
4593 | struct drbd_peer_device *peer_device; |
4594 | struct drbd_device *device; |
4595 | struct p_rs_uuid *p = pi->data; |
4596 | |
4597 | peer_device = conn_peer_device(connection, volume_number: pi->vnr); |
4598 | if (!peer_device) |
4599 | return -EIO; |
4600 | device = peer_device->device; |
4601 | |
4602 | wait_event(device->misc_wait, |
4603 | device->state.conn == C_WF_SYNC_UUID || |
4604 | device->state.conn == C_BEHIND || |
4605 | device->state.conn < C_CONNECTED || |
4606 | device->state.disk < D_NEGOTIATING); |
4607 | |
4608 | /* D_ASSERT(device, device->state.conn == C_WF_SYNC_UUID ); */ |
4609 | |
4610 | /* Here the _drbd_uuid_ functions are right, current should |
4611 | _not_ be rotated into the history */ |
4612 | if (get_ldev_if_state(device, D_NEGOTIATING)) { |
4613 | _drbd_uuid_set(device, idx: UI_CURRENT, be64_to_cpu(p->uuid)); |
4614 | _drbd_uuid_set(device, idx: UI_BITMAP, val: 0UL); |
4615 | |
4616 | drbd_print_uuids(device, text: "updated sync uuid" ); |
4617 | drbd_start_resync(device, side: C_SYNC_TARGET); |
4618 | |
4619 | put_ldev(device); |
4620 | } else |
4621 | drbd_err(device, "Ignoring SyncUUID packet!\n" ); |
4622 | |
4623 | return 0; |
4624 | } |
4625 | |
4626 | /* |
4627 | * receive_bitmap_plain |
4628 | * |
4629 | * Return 0 when done, 1 when another iteration is needed, and a negative error |
4630 | * code upon failure. |
4631 | */ |
4632 | static int |
4633 | receive_bitmap_plain(struct drbd_peer_device *peer_device, unsigned int size, |
4634 | unsigned long *p, struct bm_xfer_ctx *c) |
4635 | { |
4636 | unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - |
4637 | drbd_header_size(connection: peer_device->connection); |
4638 | unsigned int num_words = min_t(size_t, data_size / sizeof(*p), |
4639 | c->bm_words - c->word_offset); |
4640 | unsigned int want = num_words * sizeof(*p); |
4641 | int err; |
4642 | |
4643 | if (want != size) { |
4644 | drbd_err(peer_device, "%s:want (%u) != size (%u)\n" , __func__, want, size); |
4645 | return -EIO; |
4646 | } |
4647 | if (want == 0) |
4648 | return 0; |
4649 | err = drbd_recv_all(connection: peer_device->connection, buf: p, size: want); |
4650 | if (err) |
4651 | return err; |
4652 | |
4653 | drbd_bm_merge_lel(device: peer_device->device, offset: c->word_offset, number: num_words, buffer: p); |
4654 | |
4655 | c->word_offset += num_words; |
4656 | c->bit_offset = c->word_offset * BITS_PER_LONG; |
4657 | if (c->bit_offset > c->bm_bits) |
4658 | c->bit_offset = c->bm_bits; |
4659 | |
4660 | return 1; |
4661 | } |
4662 | |
4663 | static enum drbd_bitmap_code dcbp_get_code(struct p_compressed_bm *p) |
4664 | { |
4665 | return (enum drbd_bitmap_code)(p->encoding & 0x0f); |
4666 | } |
4667 | |
4668 | static int dcbp_get_start(struct p_compressed_bm *p) |
4669 | { |
4670 | return (p->encoding & 0x80) != 0; |
4671 | } |
4672 | |
4673 | static int dcbp_get_pad_bits(struct p_compressed_bm *p) |
4674 | { |
4675 | return (p->encoding >> 4) & 0x7; |
4676 | } |
4677 | |
4678 | /* |
4679 | * recv_bm_rle_bits |
4680 | * |
4681 | * Return 0 when done, 1 when another iteration is needed, and a negative error |
4682 | * code upon failure. |
4683 | */ |
4684 | static int |
4685 | recv_bm_rle_bits(struct drbd_peer_device *peer_device, |
4686 | struct p_compressed_bm *p, |
4687 | struct bm_xfer_ctx *c, |
4688 | unsigned int len) |
4689 | { |
4690 | struct bitstream bs; |
4691 | u64 look_ahead; |
4692 | u64 rl; |
4693 | u64 tmp; |
4694 | unsigned long s = c->bit_offset; |
4695 | unsigned long e; |
4696 | int toggle = dcbp_get_start(p); |
4697 | int have; |
4698 | int bits; |
4699 | |
4700 | bitstream_init(bs: &bs, s: p->code, len, pad_bits: dcbp_get_pad_bits(p)); |
4701 | |
4702 | bits = bitstream_get_bits(bs: &bs, out: &look_ahead, bits: 64); |
4703 | if (bits < 0) |
4704 | return -EIO; |
4705 | |
4706 | for (have = bits; have > 0; s += rl, toggle = !toggle) { |
4707 | bits = vli_decode_bits(out: &rl, in: look_ahead); |
4708 | if (bits <= 0) |
4709 | return -EIO; |
4710 | |
4711 | if (toggle) { |
4712 | e = s + rl -1; |
4713 | if (e >= c->bm_bits) { |
4714 | drbd_err(peer_device, "bitmap overflow (e:%lu) while decoding bm RLE packet\n" , e); |
4715 | return -EIO; |
4716 | } |
4717 | _drbd_bm_set_bits(device: peer_device->device, s, e); |
4718 | } |
4719 | |
4720 | if (have < bits) { |
4721 | drbd_err(peer_device, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n" , |
4722 | have, bits, look_ahead, |
4723 | (unsigned int)(bs.cur.b - p->code), |
4724 | (unsigned int)bs.buf_len); |
4725 | return -EIO; |
4726 | } |
4727 | /* if we consumed all 64 bits, assign 0; >> 64 is "undefined"; */ |
4728 | if (likely(bits < 64)) |
4729 | look_ahead >>= bits; |
4730 | else |
4731 | look_ahead = 0; |
4732 | have -= bits; |
4733 | |
4734 | bits = bitstream_get_bits(bs: &bs, out: &tmp, bits: 64 - have); |
4735 | if (bits < 0) |
4736 | return -EIO; |
4737 | look_ahead |= tmp << have; |
4738 | have += bits; |
4739 | } |
4740 | |
4741 | c->bit_offset = s; |
4742 | bm_xfer_ctx_bit_to_word_offset(c); |
4743 | |
4744 | return (s != c->bm_bits); |
4745 | } |
4746 | |
4747 | /* |
4748 | * decode_bitmap_c |
4749 | * |
4750 | * Return 0 when done, 1 when another iteration is needed, and a negative error |
4751 | * code upon failure. |
4752 | */ |
4753 | static int |
4754 | decode_bitmap_c(struct drbd_peer_device *peer_device, |
4755 | struct p_compressed_bm *p, |
4756 | struct bm_xfer_ctx *c, |
4757 | unsigned int len) |
4758 | { |
4759 | if (dcbp_get_code(p) == RLE_VLI_Bits) |
4760 | return recv_bm_rle_bits(peer_device, p, c, len: len - sizeof(*p)); |
4761 | |
4762 | /* other variants had been implemented for evaluation, |
4763 | * but have been dropped as this one turned out to be "best" |
4764 | * during all our tests. */ |
4765 | |
4766 | drbd_err(peer_device, "receive_bitmap_c: unknown encoding %u\n" , p->encoding); |
4767 | conn_request_state(connection: peer_device->connection, NS(conn, C_PROTOCOL_ERROR), flags: CS_HARD); |
4768 | return -EIO; |
4769 | } |
4770 | |
4771 | void INFO_bm_xfer_stats(struct drbd_peer_device *peer_device, |
4772 | const char *direction, struct bm_xfer_ctx *c) |
4773 | { |
4774 | /* what would it take to transfer it "plaintext" */ |
4775 | unsigned int = drbd_header_size(connection: peer_device->connection); |
4776 | unsigned int data_size = DRBD_SOCKET_BUFFER_SIZE - header_size; |
4777 | unsigned int plain = |
4778 | header_size * (DIV_ROUND_UP(c->bm_words, data_size) + 1) + |
4779 | c->bm_words * sizeof(unsigned long); |
4780 | unsigned int total = c->bytes[0] + c->bytes[1]; |
4781 | unsigned int r; |
4782 | |
4783 | /* total can not be zero. but just in case: */ |
4784 | if (total == 0) |
4785 | return; |
4786 | |
4787 | /* don't report if not compressed */ |
4788 | if (total >= plain) |
4789 | return; |
4790 | |
4791 | /* total < plain. check for overflow, still */ |
4792 | r = (total > UINT_MAX/1000) ? (total / (plain/1000)) |
4793 | : (1000 * total / plain); |
4794 | |
4795 | if (r > 1000) |
4796 | r = 1000; |
4797 | |
4798 | r = 1000 - r; |
4799 | drbd_info(peer_device, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), " |
4800 | "total %u; compression: %u.%u%%\n" , |
4801 | direction, |
4802 | c->bytes[1], c->packets[1], |
4803 | c->bytes[0], c->packets[0], |
4804 | total, r/10, r % 10); |
4805 | } |
4806 | |
4807 | /* Since we are processing the bitfield from lower addresses to higher, |
4808 | it does not matter if the process it in 32 bit chunks or 64 bit |
4809 | chunks as long as it is little endian. (Understand it as byte stream, |
4810 | beginning with the lowest byte...) If we would use big endian |
4811 | we would need to process it from the highest address to the lowest, |
4812 | in order to be agnostic to the 32 vs 64 bits issue. |
4813 | |
4814 | returns 0 on failure, 1 if we successfully received it. */ |
4815 | static int receive_bitmap(struct drbd_connection *connection, struct packet_info *pi) |
4816 | { |
4817 | struct drbd_peer_device *peer_device; |
4818 | struct drbd_device *device; |
4819 | struct bm_xfer_ctx c; |
4820 | int err; |
4821 | |
4822 | peer_device = conn_peer_device(connection, volume_number: pi->vnr); |
4823 | if (!peer_device) |
4824 | return -EIO; |
4825 | device = peer_device->device; |
4826 | |
4827 | drbd_bm_lock(device, why: "receive bitmap" , flags: BM_LOCKED_SET_ALLOWED); |
4828 | /* you are supposed to send additional out-of-sync information |
4829 | * if you actually set bits during this phase */ |
4830 | |
4831 | c = (struct bm_xfer_ctx) { |
4832 | .bm_bits = drbd_bm_bits(device), |
4833 | .bm_words = drbd_bm_words(device), |
4834 | }; |
4835 | |
4836 | for(;;) { |
4837 | if (pi->cmd == P_BITMAP) |
4838 | err = receive_bitmap_plain(peer_device, size: pi->size, p: pi->data, c: &c); |
4839 | else if (pi->cmd == P_COMPRESSED_BITMAP) { |
4840 | /* MAYBE: sanity check that we speak proto >= 90, |
4841 | * and the feature is enabled! */ |
4842 | struct p_compressed_bm *p = pi->data; |
4843 | |
4844 | if (pi->size > DRBD_SOCKET_BUFFER_SIZE - drbd_header_size(connection)) { |
4845 | drbd_err(device, "ReportCBitmap packet too large\n" ); |
4846 | err = -EIO; |
4847 | goto out; |
4848 | } |
4849 | if (pi->size <= sizeof(*p)) { |
4850 | drbd_err(device, "ReportCBitmap packet too small (l:%u)\n" , pi->size); |
4851 | err = -EIO; |
4852 | goto out; |
4853 | } |
4854 | err = drbd_recv_all(connection: peer_device->connection, buf: p, size: pi->size); |
4855 | if (err) |
4856 | goto out; |
4857 | err = decode_bitmap_c(peer_device, p, c: &c, len: pi->size); |
4858 | } else { |
4859 | drbd_warn(device, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)" , pi->cmd); |
4860 | err = -EIO; |
4861 | goto out; |
4862 | } |
4863 | |
4864 | c.packets[pi->cmd == P_BITMAP]++; |
4865 | c.bytes[pi->cmd == P_BITMAP] += drbd_header_size(connection) + pi->size; |
4866 | |
4867 | if (err <= 0) { |
4868 | if (err < 0) |
4869 | goto out; |
4870 | break; |
4871 | } |
4872 | err = drbd_recv_header(connection: peer_device->connection, pi); |
4873 | if (err) |
4874 | goto out; |
4875 | } |
4876 | |
4877 | INFO_bm_xfer_stats(peer_device, direction: "receive" , c: &c); |
4878 | |
4879 | if (device->state.conn == C_WF_BITMAP_T) { |
4880 | enum drbd_state_rv rv; |
4881 | |
4882 | err = drbd_send_bitmap(device, peer_device); |
4883 | if (err) |
4884 | goto out; |
4885 | /* Omit CS_ORDERED with this state transition to avoid deadlocks. */ |
4886 | rv = _drbd_request_state(device, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); |
4887 | D_ASSERT(device, rv == SS_SUCCESS); |
4888 | } else if (device->state.conn != C_WF_BITMAP_S) { |
4889 | /* admin may have requested C_DISCONNECTING, |
4890 | * other threads may have noticed network errors */ |
4891 | drbd_info(device, "unexpected cstate (%s) in receive_bitmap\n" , |
4892 | drbd_conn_str(device->state.conn)); |
4893 | } |
4894 | err = 0; |
4895 | |
4896 | out: |
4897 | drbd_bm_unlock(device); |
4898 | if (!err && device->state.conn == C_WF_BITMAP_S) |
4899 | drbd_start_resync(device, side: C_SYNC_SOURCE); |
4900 | return err; |
4901 | } |
4902 | |
4903 | static int receive_skip(struct drbd_connection *connection, struct packet_info *pi) |
4904 | { |
4905 | drbd_warn(connection, "skipping unknown optional packet type %d, l: %d!\n" , |
4906 | pi->cmd, pi->size); |
4907 | |
4908 | return ignore_remaining_packet(connection, pi); |
4909 | } |
4910 | |
4911 | static int receive_UnplugRemote(struct drbd_connection *connection, struct packet_info *pi) |
4912 | { |
4913 | /* Make sure we've acked all the TCP data associated |
4914 | * with the data requests being unplugged */ |
4915 | tcp_sock_set_quickack(sk: connection->data.socket->sk, val: 2); |
4916 | return 0; |
4917 | } |
4918 | |
4919 | static int receive_out_of_sync(struct drbd_connection *connection, struct packet_info *pi) |
4920 | { |
4921 | struct drbd_peer_device *peer_device; |
4922 | struct drbd_device *device; |
4923 | struct p_block_desc *p = pi->data; |
4924 | |
4925 | peer_device = conn_peer_device(connection, volume_number: pi->vnr); |
4926 | if (!peer_device) |
4927 | return -EIO; |
4928 | device = peer_device->device; |
4929 | |
4930 | switch (device->state.conn) { |
4931 | case C_WF_SYNC_UUID: |
4932 | case C_WF_BITMAP_T: |
4933 | case C_BEHIND: |
4934 | break; |
4935 | default: |
4936 | drbd_err(device, "ASSERT FAILED cstate = %s, expected: WFSyncUUID|WFBitMapT|Behind\n" , |
4937 | drbd_conn_str(device->state.conn)); |
4938 | } |
4939 | |
4940 | drbd_set_out_of_sync(peer_device, be64_to_cpu(p->sector), be32_to_cpu(p->blksize)); |
4941 | |
4942 | return 0; |
4943 | } |
4944 | |
4945 | static int receive_rs_deallocated(struct drbd_connection *connection, struct packet_info *pi) |
4946 | { |
4947 | struct drbd_peer_device *peer_device; |
4948 | struct p_block_desc *p = pi->data; |
4949 | struct drbd_device *device; |
4950 | sector_t sector; |
4951 | int size, err = 0; |
4952 | |
4953 | peer_device = conn_peer_device(connection, volume_number: pi->vnr); |
4954 | if (!peer_device) |
4955 | return -EIO; |
4956 | device = peer_device->device; |
4957 | |
4958 | sector = be64_to_cpu(p->sector); |
4959 | size = be32_to_cpu(p->blksize); |
4960 | |
4961 | dec_rs_pending(peer_device); |
4962 | |
4963 | if (get_ldev(device)) { |
4964 | struct drbd_peer_request *peer_req; |
4965 | |
4966 | peer_req = drbd_alloc_peer_req(peer_device, ID_SYNCER, sector, |
4967 | request_size: size, payload_size: 0, GFP_NOIO); |
4968 | if (!peer_req) { |
4969 | put_ldev(device); |
4970 | return -ENOMEM; |
4971 | } |
4972 | |
4973 | peer_req->w.cb = e_end_resync_block; |
4974 | peer_req->opf = REQ_OP_DISCARD; |
4975 | peer_req->submit_jif = jiffies; |
4976 | peer_req->flags |= EE_TRIM; |
4977 | |
4978 | spin_lock_irq(lock: &device->resource->req_lock); |
4979 | list_add_tail(new: &peer_req->w.list, head: &device->sync_ee); |
4980 | spin_unlock_irq(lock: &device->resource->req_lock); |
4981 | |
4982 | atomic_add(i: pi->size >> 9, v: &device->rs_sect_ev); |
4983 | err = drbd_submit_peer_request(peer_req); |
4984 | |
4985 | if (err) { |
4986 | spin_lock_irq(lock: &device->resource->req_lock); |
4987 | list_del(entry: &peer_req->w.list); |
4988 | spin_unlock_irq(lock: &device->resource->req_lock); |
4989 | |
4990 | drbd_free_peer_req(device, peer_req); |
4991 | put_ldev(device); |
4992 | err = 0; |
4993 | goto fail; |
4994 | } |
4995 | |
4996 | inc_unacked(device); |
4997 | |
4998 | /* No put_ldev() here. Gets called in drbd_endio_write_sec_final(), |
4999 | as well as drbd_rs_complete_io() */ |
5000 | } else { |
5001 | fail: |
5002 | drbd_rs_complete_io(device, sector); |
5003 | drbd_send_ack_ex(peer_device, P_NEG_ACK, sector, blksize: size, ID_SYNCER); |
5004 | } |
5005 | |
5006 | atomic_add(i: size >> 9, v: &device->rs_sect_in); |
5007 | |
5008 | return err; |
5009 | } |
5010 | |
5011 | struct data_cmd { |
5012 | int expect_payload; |
5013 | unsigned int pkt_size; |
5014 | int (*fn)(struct drbd_connection *, struct packet_info *); |
5015 | }; |
5016 | |
5017 | static struct data_cmd drbd_cmd_handler[] = { |
5018 | [P_DATA] = { 1, sizeof(struct p_data), receive_Data }, |
5019 | [P_DATA_REPLY] = { .expect_payload: 1, .pkt_size: sizeof(struct p_data), .fn: receive_DataReply }, |
5020 | [P_RS_DATA_REPLY] = { .expect_payload: 1, .pkt_size: sizeof(struct p_data), .fn: receive_RSDataReply } , |
5021 | [P_BARRIER] = { .expect_payload: 0, .pkt_size: sizeof(struct p_barrier), .fn: receive_Barrier } , |
5022 | [P_BITMAP] = { .expect_payload: 1, .pkt_size: 0, .fn: receive_bitmap } , |
5023 | [P_COMPRESSED_BITMAP] = { .expect_payload: 1, .pkt_size: 0, .fn: receive_bitmap } , |
5024 | [P_UNPLUG_REMOTE] = { .expect_payload: 0, .pkt_size: 0, .fn: receive_UnplugRemote }, |
5025 | [P_DATA_REQUEST] = { .expect_payload: 0, .pkt_size: sizeof(struct p_block_req), .fn: receive_DataRequest }, |
5026 | [P_RS_DATA_REQUEST] = { .expect_payload: 0, .pkt_size: sizeof(struct p_block_req), .fn: receive_DataRequest }, |
5027 | [P_SYNC_PARAM] = { .expect_payload: 1, .pkt_size: 0, .fn: receive_SyncParam }, |
5028 | [P_SYNC_PARAM89] = { .expect_payload: 1, .pkt_size: 0, .fn: receive_SyncParam }, |
5029 | [P_PROTOCOL] = { .expect_payload: 1, .pkt_size: sizeof(struct p_protocol), .fn: receive_protocol }, |
5030 | [P_UUIDS] = { .expect_payload: 0, .pkt_size: sizeof(struct p_uuids), .fn: receive_uuids }, |
5031 | [P_SIZES] = { .expect_payload: 0, .pkt_size: sizeof(struct p_sizes), .fn: receive_sizes }, |
5032 | [P_STATE] = { .expect_payload: 0, .pkt_size: sizeof(struct p_state), .fn: receive_state }, |
5033 | [P_STATE_CHG_REQ] = { .expect_payload: 0, .pkt_size: sizeof(struct p_req_state), .fn: receive_req_state }, |
5034 | [P_SYNC_UUID] = { .expect_payload: 0, .pkt_size: sizeof(struct p_rs_uuid), .fn: receive_sync_uuid }, |
5035 | [P_OV_REQUEST] = { .expect_payload: 0, .pkt_size: sizeof(struct p_block_req), .fn: receive_DataRequest }, |
5036 | [P_OV_REPLY] = { .expect_payload: 1, .pkt_size: sizeof(struct p_block_req), .fn: receive_DataRequest }, |
5037 | [P_CSUM_RS_REQUEST] = { .expect_payload: 1, .pkt_size: sizeof(struct p_block_req), .fn: receive_DataRequest }, |
5038 | [P_RS_THIN_REQ] = { .expect_payload: 0, .pkt_size: sizeof(struct p_block_req), .fn: receive_DataRequest }, |
5039 | [P_DELAY_PROBE] = { .expect_payload: 0, .pkt_size: sizeof(struct p_delay_probe93), .fn: receive_skip }, |
5040 | [P_OUT_OF_SYNC] = { .expect_payload: 0, .pkt_size: sizeof(struct p_block_desc), .fn: receive_out_of_sync }, |
5041 | [P_CONN_ST_CHG_REQ] = { .expect_payload: 0, .pkt_size: sizeof(struct p_req_state), .fn: receive_req_conn_state }, |
5042 | [P_PROTOCOL_UPDATE] = { .expect_payload: 1, .pkt_size: sizeof(struct p_protocol), .fn: receive_protocol }, |
5043 | [P_TRIM] = { .expect_payload: 0, .pkt_size: sizeof(struct p_trim), .fn: receive_Data }, |
5044 | [P_ZEROES] = { .expect_payload: 0, .pkt_size: sizeof(struct p_trim), .fn: receive_Data }, |
5045 | [P_RS_DEALLOCATED] = { .expect_payload: 0, .pkt_size: sizeof(struct p_block_desc), .fn: receive_rs_deallocated }, |
5046 | }; |
5047 | |
5048 | static void drbdd(struct drbd_connection *connection) |
5049 | { |
5050 | struct packet_info pi; |
5051 | size_t shs; /* sub header size */ |
5052 | int err; |
5053 | |
5054 | while (get_t_state(thi: &connection->receiver) == RUNNING) { |
5055 | struct data_cmd const *cmd; |
5056 | |
5057 | drbd_thread_current_set_cpu(thi: &connection->receiver); |
5058 | update_receiver_timing_details(connection, drbd_recv_header_maybe_unplug); |
5059 | if (drbd_recv_header_maybe_unplug(connection, pi: &pi)) |
5060 | goto err_out; |
5061 | |
5062 | cmd = &drbd_cmd_handler[pi.cmd]; |
5063 | if (unlikely(pi.cmd >= ARRAY_SIZE(drbd_cmd_handler) || !cmd->fn)) { |
5064 | drbd_err(connection, "Unexpected data packet %s (0x%04x)" , |
5065 | cmdname(pi.cmd), pi.cmd); |
5066 | goto err_out; |
5067 | } |
5068 | |
5069 | shs = cmd->pkt_size; |
5070 | if (pi.cmd == P_SIZES && connection->agreed_features & DRBD_FF_WSAME) |
5071 | shs += sizeof(struct o_qlim); |
5072 | if (pi.size > shs && !cmd->expect_payload) { |
5073 | drbd_err(connection, "No payload expected %s l:%d\n" , |
5074 | cmdname(pi.cmd), pi.size); |
5075 | goto err_out; |
5076 | } |
5077 | if (pi.size < shs) { |
5078 | drbd_err(connection, "%s: unexpected packet size, expected:%d received:%d\n" , |
5079 | cmdname(pi.cmd), (int)shs, pi.size); |
5080 | goto err_out; |
5081 | } |
5082 | |
5083 | if (shs) { |
5084 | update_receiver_timing_details(connection, drbd_recv_all_warn); |
5085 | err = drbd_recv_all_warn(connection, buf: pi.data, size: shs); |
5086 | if (err) |
5087 | goto err_out; |
5088 | pi.size -= shs; |
5089 | } |
5090 | |
5091 | update_receiver_timing_details(connection, cmd->fn); |
5092 | err = cmd->fn(connection, &pi); |
5093 | if (err) { |
5094 | drbd_err(connection, "error receiving %s, e: %d l: %d!\n" , |
5095 | cmdname(pi.cmd), err, pi.size); |
5096 | goto err_out; |
5097 | } |
5098 | } |
5099 | return; |
5100 | |
5101 | err_out: |
5102 | conn_request_state(connection, NS(conn, C_PROTOCOL_ERROR), flags: CS_HARD); |
5103 | } |
5104 | |
5105 | static void conn_disconnect(struct drbd_connection *connection) |
5106 | { |
5107 | struct drbd_peer_device *peer_device; |
5108 | enum drbd_conns oc; |
5109 | int vnr; |
5110 | |
5111 | if (connection->cstate == C_STANDALONE) |
5112 | return; |
5113 | |
5114 | /* We are about to start the cleanup after connection loss. |
5115 | * Make sure drbd_make_request knows about that. |
5116 | * Usually we should be in some network failure state already, |
5117 | * but just in case we are not, we fix it up here. |
5118 | */ |
5119 | conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), flags: CS_HARD); |
5120 | |
5121 | /* ack_receiver does not clean up anything. it must not interfere, either */ |
5122 | drbd_thread_stop(thi: &connection->ack_receiver); |
5123 | if (connection->ack_sender) { |
5124 | destroy_workqueue(wq: connection->ack_sender); |
5125 | connection->ack_sender = NULL; |
5126 | } |
5127 | drbd_free_sock(connection); |
5128 | |
5129 | rcu_read_lock(); |
5130 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
5131 | struct drbd_device *device = peer_device->device; |
5132 | kref_get(kref: &device->kref); |
5133 | rcu_read_unlock(); |
5134 | drbd_disconnected(peer_device); |
5135 | kref_put(kref: &device->kref, release: drbd_destroy_device); |
5136 | rcu_read_lock(); |
5137 | } |
5138 | rcu_read_unlock(); |
5139 | |
5140 | if (!list_empty(head: &connection->current_epoch->list)) |
5141 | drbd_err(connection, "ASSERTION FAILED: connection->current_epoch->list not empty\n" ); |
5142 | /* ok, no more ee's on the fly, it is safe to reset the epoch_size */ |
5143 | atomic_set(v: &connection->current_epoch->epoch_size, i: 0); |
5144 | connection->send.seen_any_write_yet = false; |
5145 | |
5146 | drbd_info(connection, "Connection closed\n" ); |
5147 | |
5148 | if (conn_highest_role(connection) == R_PRIMARY && conn_highest_pdsk(connection) >= D_UNKNOWN) |
5149 | conn_try_outdate_peer_async(connection); |
5150 | |
5151 | spin_lock_irq(lock: &connection->resource->req_lock); |
5152 | oc = connection->cstate; |
5153 | if (oc >= C_UNCONNECTED) |
5154 | _conn_request_state(connection, NS(conn, C_UNCONNECTED), flags: CS_VERBOSE); |
5155 | |
5156 | spin_unlock_irq(lock: &connection->resource->req_lock); |
5157 | |
5158 | if (oc == C_DISCONNECTING) |
5159 | conn_request_state(connection, NS(conn, C_STANDALONE), flags: CS_VERBOSE | CS_HARD); |
5160 | } |
5161 | |
5162 | static int drbd_disconnected(struct drbd_peer_device *peer_device) |
5163 | { |
5164 | struct drbd_device *device = peer_device->device; |
5165 | unsigned int i; |
5166 | |
5167 | /* wait for current activity to cease. */ |
5168 | spin_lock_irq(lock: &device->resource->req_lock); |
5169 | _drbd_wait_ee_list_empty(device, head: &device->active_ee); |
5170 | _drbd_wait_ee_list_empty(device, head: &device->sync_ee); |
5171 | _drbd_wait_ee_list_empty(device, head: &device->read_ee); |
5172 | spin_unlock_irq(lock: &device->resource->req_lock); |
5173 | |
5174 | /* We do not have data structures that would allow us to |
5175 | * get the rs_pending_cnt down to 0 again. |
5176 | * * On C_SYNC_TARGET we do not have any data structures describing |
5177 | * the pending RSDataRequest's we have sent. |
5178 | * * On C_SYNC_SOURCE there is no data structure that tracks |
5179 | * the P_RS_DATA_REPLY blocks that we sent to the SyncTarget. |
5180 | * And no, it is not the sum of the reference counts in the |
5181 | * resync_LRU. The resync_LRU tracks the whole operation including |
5182 | * the disk-IO, while the rs_pending_cnt only tracks the blocks |
5183 | * on the fly. */ |
5184 | drbd_rs_cancel_all(device); |
5185 | device->rs_total = 0; |
5186 | device->rs_failed = 0; |
5187 | atomic_set(v: &device->rs_pending_cnt, i: 0); |
5188 | wake_up(&device->misc_wait); |
5189 | |
5190 | del_timer_sync(timer: &device->resync_timer); |
5191 | resync_timer_fn(t: &device->resync_timer); |
5192 | |
5193 | /* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier, |
5194 | * w_make_resync_request etc. which may still be on the worker queue |
5195 | * to be "canceled" */ |
5196 | drbd_flush_workqueue(work_queue: &peer_device->connection->sender_work); |
5197 | |
5198 | drbd_finish_peer_reqs(device); |
5199 | |
5200 | /* This second workqueue flush is necessary, since drbd_finish_peer_reqs() |
5201 | might have issued a work again. The one before drbd_finish_peer_reqs() is |
5202 | necessary to reclain net_ee in drbd_finish_peer_reqs(). */ |
5203 | drbd_flush_workqueue(work_queue: &peer_device->connection->sender_work); |
5204 | |
5205 | /* need to do it again, drbd_finish_peer_reqs() may have populated it |
5206 | * again via drbd_try_clear_on_disk_bm(). */ |
5207 | drbd_rs_cancel_all(device); |
5208 | |
5209 | kfree(objp: device->p_uuid); |
5210 | device->p_uuid = NULL; |
5211 | |
5212 | if (!drbd_suspended(device)) |
5213 | tl_clear(peer_device->connection); |
5214 | |
5215 | drbd_md_sync(device); |
5216 | |
5217 | if (get_ldev(device)) { |
5218 | drbd_bitmap_io(device, io_fn: &drbd_bm_write_copy_pages, |
5219 | why: "write from disconnected" , flags: BM_LOCKED_CHANGE_ALLOWED, NULL); |
5220 | put_ldev(device); |
5221 | } |
5222 | |
5223 | /* tcp_close and release of sendpage pages can be deferred. I don't |
5224 | * want to use SO_LINGER, because apparently it can be deferred for |
5225 | * more than 20 seconds (longest time I checked). |
5226 | * |
5227 | * Actually we don't care for exactly when the network stack does its |
5228 | * put_page(), but release our reference on these pages right here. |
5229 | */ |
5230 | i = drbd_free_peer_reqs(device, list: &device->net_ee); |
5231 | if (i) |
5232 | drbd_info(device, "net_ee not empty, killed %u entries\n" , i); |
5233 | i = atomic_read(v: &device->pp_in_use_by_net); |
5234 | if (i) |
5235 | drbd_info(device, "pp_in_use_by_net = %d, expected 0\n" , i); |
5236 | i = atomic_read(v: &device->pp_in_use); |
5237 | if (i) |
5238 | drbd_info(device, "pp_in_use = %d, expected 0\n" , i); |
5239 | |
5240 | D_ASSERT(device, list_empty(&device->read_ee)); |
5241 | D_ASSERT(device, list_empty(&device->active_ee)); |
5242 | D_ASSERT(device, list_empty(&device->sync_ee)); |
5243 | D_ASSERT(device, list_empty(&device->done_ee)); |
5244 | |
5245 | return 0; |
5246 | } |
5247 | |
5248 | /* |
5249 | * We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version |
5250 | * we can agree on is stored in agreed_pro_version. |
5251 | * |
5252 | * feature flags and the reserved array should be enough room for future |
5253 | * enhancements of the handshake protocol, and possible plugins... |
5254 | * |
5255 | * for now, they are expected to be zero, but ignored. |
5256 | */ |
5257 | static int drbd_send_features(struct drbd_connection *connection) |
5258 | { |
5259 | struct drbd_socket *sock; |
5260 | struct p_connection_features *p; |
5261 | |
5262 | sock = &connection->data; |
5263 | p = conn_prepare_command(connection, sock); |
5264 | if (!p) |
5265 | return -EIO; |
5266 | memset(p, 0, sizeof(*p)); |
5267 | p->protocol_min = cpu_to_be32(PRO_VERSION_MIN); |
5268 | p->protocol_max = cpu_to_be32(PRO_VERSION_MAX); |
5269 | p->feature_flags = cpu_to_be32(PRO_FEATURES); |
5270 | return conn_send_command(connection, sock, P_CONNECTION_FEATURES, sizeof(*p), NULL, 0); |
5271 | } |
5272 | |
5273 | /* |
5274 | * return values: |
5275 | * 1 yes, we have a valid connection |
5276 | * 0 oops, did not work out, please try again |
5277 | * -1 peer talks different language, |
5278 | * no point in trying again, please go standalone. |
5279 | */ |
5280 | static int drbd_do_features(struct drbd_connection *connection) |
5281 | { |
5282 | /* ASSERT current == connection->receiver ... */ |
5283 | struct p_connection_features *p; |
5284 | const int expect = sizeof(struct p_connection_features); |
5285 | struct packet_info pi; |
5286 | int err; |
5287 | |
5288 | err = drbd_send_features(connection); |
5289 | if (err) |
5290 | return 0; |
5291 | |
5292 | err = drbd_recv_header(connection, pi: &pi); |
5293 | if (err) |
5294 | return 0; |
5295 | |
5296 | if (pi.cmd != P_CONNECTION_FEATURES) { |
5297 | drbd_err(connection, "expected ConnectionFeatures packet, received: %s (0x%04x)\n" , |
5298 | cmdname(pi.cmd), pi.cmd); |
5299 | return -1; |
5300 | } |
5301 | |
5302 | if (pi.size != expect) { |
5303 | drbd_err(connection, "expected ConnectionFeatures length: %u, received: %u\n" , |
5304 | expect, pi.size); |
5305 | return -1; |
5306 | } |
5307 | |
5308 | p = pi.data; |
5309 | err = drbd_recv_all_warn(connection, buf: p, size: expect); |
5310 | if (err) |
5311 | return 0; |
5312 | |
5313 | p->protocol_min = be32_to_cpu(p->protocol_min); |
5314 | p->protocol_max = be32_to_cpu(p->protocol_max); |
5315 | if (p->protocol_max == 0) |
5316 | p->protocol_max = p->protocol_min; |
5317 | |
5318 | if (PRO_VERSION_MAX < p->protocol_min || |
5319 | PRO_VERSION_MIN > p->protocol_max) |
5320 | goto incompat; |
5321 | |
5322 | connection->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max); |
5323 | connection->agreed_features = PRO_FEATURES & be32_to_cpu(p->feature_flags); |
5324 | |
5325 | drbd_info(connection, "Handshake successful: " |
5326 | "Agreed network protocol version %d\n" , connection->agreed_pro_version); |
5327 | |
5328 | drbd_info(connection, "Feature flags enabled on protocol level: 0x%x%s%s%s%s.\n" , |
5329 | connection->agreed_features, |
5330 | connection->agreed_features & DRBD_FF_TRIM ? " TRIM" : "" , |
5331 | connection->agreed_features & DRBD_FF_THIN_RESYNC ? " THIN_RESYNC" : "" , |
5332 | connection->agreed_features & DRBD_FF_WSAME ? " WRITE_SAME" : "" , |
5333 | connection->agreed_features & DRBD_FF_WZEROES ? " WRITE_ZEROES" : |
5334 | connection->agreed_features ? "" : " none" ); |
5335 | |
5336 | return 1; |
5337 | |
5338 | incompat: |
5339 | drbd_err(connection, "incompatible DRBD dialects: " |
5340 | "I support %d-%d, peer supports %d-%d\n" , |
5341 | PRO_VERSION_MIN, PRO_VERSION_MAX, |
5342 | p->protocol_min, p->protocol_max); |
5343 | return -1; |
5344 | } |
5345 | |
5346 | #if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE) |
5347 | static int drbd_do_auth(struct drbd_connection *connection) |
5348 | { |
5349 | drbd_err(connection, "This kernel was build without CONFIG_CRYPTO_HMAC.\n" ); |
5350 | drbd_err(connection, "You need to disable 'cram-hmac-alg' in drbd.conf.\n" ); |
5351 | return -1; |
5352 | } |
5353 | #else |
5354 | #define CHALLENGE_LEN 64 |
5355 | |
5356 | /* Return value: |
5357 | 1 - auth succeeded, |
5358 | 0 - failed, try again (network error), |
5359 | -1 - auth failed, don't try again. |
5360 | */ |
5361 | |
5362 | static int drbd_do_auth(struct drbd_connection *connection) |
5363 | { |
5364 | struct drbd_socket *sock; |
5365 | char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */ |
5366 | char *response = NULL; |
5367 | char *right_response = NULL; |
5368 | char *peers_ch = NULL; |
5369 | unsigned int key_len; |
5370 | char secret[SHARED_SECRET_MAX]; /* 64 byte */ |
5371 | unsigned int resp_size; |
5372 | struct shash_desc *desc; |
5373 | struct packet_info pi; |
5374 | struct net_conf *nc; |
5375 | int err, rv; |
5376 | |
5377 | /* FIXME: Put the challenge/response into the preallocated socket buffer. */ |
5378 | |
5379 | rcu_read_lock(); |
5380 | nc = rcu_dereference(connection->net_conf); |
5381 | key_len = strlen(nc->shared_secret); |
5382 | memcpy(secret, nc->shared_secret, key_len); |
5383 | rcu_read_unlock(); |
5384 | |
5385 | desc = kmalloc(size: sizeof(struct shash_desc) + |
5386 | crypto_shash_descsize(tfm: connection->cram_hmac_tfm), |
5387 | GFP_KERNEL); |
5388 | if (!desc) { |
5389 | rv = -1; |
5390 | goto fail; |
5391 | } |
5392 | desc->tfm = connection->cram_hmac_tfm; |
5393 | |
5394 | rv = crypto_shash_setkey(tfm: connection->cram_hmac_tfm, key: (u8 *)secret, keylen: key_len); |
5395 | if (rv) { |
5396 | drbd_err(connection, "crypto_shash_setkey() failed with %d\n" , rv); |
5397 | rv = -1; |
5398 | goto fail; |
5399 | } |
5400 | |
5401 | get_random_bytes(buf: my_challenge, CHALLENGE_LEN); |
5402 | |
5403 | sock = &connection->data; |
5404 | if (!conn_prepare_command(connection, sock)) { |
5405 | rv = 0; |
5406 | goto fail; |
5407 | } |
5408 | rv = !conn_send_command(connection, sock, P_AUTH_CHALLENGE, 0, |
5409 | my_challenge, CHALLENGE_LEN); |
5410 | if (!rv) |
5411 | goto fail; |
5412 | |
5413 | err = drbd_recv_header(connection, pi: &pi); |
5414 | if (err) { |
5415 | rv = 0; |
5416 | goto fail; |
5417 | } |
5418 | |
5419 | if (pi.cmd != P_AUTH_CHALLENGE) { |
5420 | drbd_err(connection, "expected AuthChallenge packet, received: %s (0x%04x)\n" , |
5421 | cmdname(pi.cmd), pi.cmd); |
5422 | rv = -1; |
5423 | goto fail; |
5424 | } |
5425 | |
5426 | if (pi.size > CHALLENGE_LEN * 2) { |
5427 | drbd_err(connection, "expected AuthChallenge payload too big.\n" ); |
5428 | rv = -1; |
5429 | goto fail; |
5430 | } |
5431 | |
5432 | if (pi.size < CHALLENGE_LEN) { |
5433 | drbd_err(connection, "AuthChallenge payload too small.\n" ); |
5434 | rv = -1; |
5435 | goto fail; |
5436 | } |
5437 | |
5438 | peers_ch = kmalloc(size: pi.size, GFP_NOIO); |
5439 | if (!peers_ch) { |
5440 | rv = -1; |
5441 | goto fail; |
5442 | } |
5443 | |
5444 | err = drbd_recv_all_warn(connection, buf: peers_ch, size: pi.size); |
5445 | if (err) { |
5446 | rv = 0; |
5447 | goto fail; |
5448 | } |
5449 | |
5450 | if (!memcmp(p: my_challenge, q: peers_ch, CHALLENGE_LEN)) { |
5451 | drbd_err(connection, "Peer presented the same challenge!\n" ); |
5452 | rv = -1; |
5453 | goto fail; |
5454 | } |
5455 | |
5456 | resp_size = crypto_shash_digestsize(tfm: connection->cram_hmac_tfm); |
5457 | response = kmalloc(size: resp_size, GFP_NOIO); |
5458 | if (!response) { |
5459 | rv = -1; |
5460 | goto fail; |
5461 | } |
5462 | |
5463 | rv = crypto_shash_digest(desc, data: peers_ch, len: pi.size, out: response); |
5464 | if (rv) { |
5465 | drbd_err(connection, "crypto_hash_digest() failed with %d\n" , rv); |
5466 | rv = -1; |
5467 | goto fail; |
5468 | } |
5469 | |
5470 | if (!conn_prepare_command(connection, sock)) { |
5471 | rv = 0; |
5472 | goto fail; |
5473 | } |
5474 | rv = !conn_send_command(connection, sock, P_AUTH_RESPONSE, 0, |
5475 | response, resp_size); |
5476 | if (!rv) |
5477 | goto fail; |
5478 | |
5479 | err = drbd_recv_header(connection, pi: &pi); |
5480 | if (err) { |
5481 | rv = 0; |
5482 | goto fail; |
5483 | } |
5484 | |
5485 | if (pi.cmd != P_AUTH_RESPONSE) { |
5486 | drbd_err(connection, "expected AuthResponse packet, received: %s (0x%04x)\n" , |
5487 | cmdname(pi.cmd), pi.cmd); |
5488 | rv = 0; |
5489 | goto fail; |
5490 | } |
5491 | |
5492 | if (pi.size != resp_size) { |
5493 | drbd_err(connection, "expected AuthResponse payload of wrong size\n" ); |
5494 | rv = 0; |
5495 | goto fail; |
5496 | } |
5497 | |
5498 | err = drbd_recv_all_warn(connection, buf: response , size: resp_size); |
5499 | if (err) { |
5500 | rv = 0; |
5501 | goto fail; |
5502 | } |
5503 | |
5504 | right_response = kmalloc(size: resp_size, GFP_NOIO); |
5505 | if (!right_response) { |
5506 | rv = -1; |
5507 | goto fail; |
5508 | } |
5509 | |
5510 | rv = crypto_shash_digest(desc, data: my_challenge, CHALLENGE_LEN, |
5511 | out: right_response); |
5512 | if (rv) { |
5513 | drbd_err(connection, "crypto_hash_digest() failed with %d\n" , rv); |
5514 | rv = -1; |
5515 | goto fail; |
5516 | } |
5517 | |
5518 | rv = !memcmp(p: response, q: right_response, size: resp_size); |
5519 | |
5520 | if (rv) |
5521 | drbd_info(connection, "Peer authenticated using %d bytes HMAC\n" , |
5522 | resp_size); |
5523 | else |
5524 | rv = -1; |
5525 | |
5526 | fail: |
5527 | kfree(objp: peers_ch); |
5528 | kfree(objp: response); |
5529 | kfree(objp: right_response); |
5530 | if (desc) { |
5531 | shash_desc_zero(desc); |
5532 | kfree(objp: desc); |
5533 | } |
5534 | |
5535 | return rv; |
5536 | } |
5537 | #endif |
5538 | |
5539 | int drbd_receiver(struct drbd_thread *thi) |
5540 | { |
5541 | struct drbd_connection *connection = thi->connection; |
5542 | int h; |
5543 | |
5544 | drbd_info(connection, "receiver (re)started\n" ); |
5545 | |
5546 | do { |
5547 | h = conn_connect(connection); |
5548 | if (h == 0) { |
5549 | conn_disconnect(connection); |
5550 | schedule_timeout_interruptible(HZ); |
5551 | } |
5552 | if (h == -1) { |
5553 | drbd_warn(connection, "Discarding network configuration.\n" ); |
5554 | conn_request_state(connection, NS(conn, C_DISCONNECTING), flags: CS_HARD); |
5555 | } |
5556 | } while (h == 0); |
5557 | |
5558 | if (h > 0) { |
5559 | blk_start_plug(&connection->receiver_plug); |
5560 | drbdd(connection); |
5561 | blk_finish_plug(&connection->receiver_plug); |
5562 | } |
5563 | |
5564 | conn_disconnect(connection); |
5565 | |
5566 | drbd_info(connection, "receiver terminated\n" ); |
5567 | return 0; |
5568 | } |
5569 | |
5570 | /* ********* acknowledge sender ******** */ |
5571 | |
5572 | static int got_conn_RqSReply(struct drbd_connection *connection, struct packet_info *pi) |
5573 | { |
5574 | struct p_req_state_reply *p = pi->data; |
5575 | int retcode = be32_to_cpu(p->retcode); |
5576 | |
5577 | if (retcode >= SS_SUCCESS) { |
5578 | set_bit(nr: CONN_WD_ST_CHG_OKAY, addr: &connection->flags); |
5579 | } else { |
5580 | set_bit(nr: CONN_WD_ST_CHG_FAIL, addr: &connection->flags); |
5581 | drbd_err(connection, "Requested state change failed by peer: %s (%d)\n" , |
5582 | drbd_set_st_err_str(retcode), retcode); |
5583 | } |
5584 | wake_up(&connection->ping_wait); |
5585 | |
5586 | return 0; |
5587 | } |
5588 | |
5589 | static int got_RqSReply(struct drbd_connection *connection, struct packet_info *pi) |
5590 | { |
5591 | struct drbd_peer_device *peer_device; |
5592 | struct drbd_device *device; |
5593 | struct p_req_state_reply *p = pi->data; |
5594 | int retcode = be32_to_cpu(p->retcode); |
5595 | |
5596 | peer_device = conn_peer_device(connection, volume_number: pi->vnr); |
5597 | if (!peer_device) |
5598 | return -EIO; |
5599 | device = peer_device->device; |
5600 | |
5601 | if (test_bit(CONN_WD_ST_CHG_REQ, &connection->flags)) { |
5602 | D_ASSERT(device, connection->agreed_pro_version < 100); |
5603 | return got_conn_RqSReply(connection, pi); |
5604 | } |
5605 | |
5606 | if (retcode >= SS_SUCCESS) { |
5607 | set_bit(nr: CL_ST_CHG_SUCCESS, addr: &device->flags); |
5608 | } else { |
5609 | set_bit(nr: CL_ST_CHG_FAIL, addr: &device->flags); |
5610 | drbd_err(device, "Requested state change failed by peer: %s (%d)\n" , |
5611 | drbd_set_st_err_str(retcode), retcode); |
5612 | } |
5613 | wake_up(&device->state_wait); |
5614 | |
5615 | return 0; |
5616 | } |
5617 | |
5618 | static int got_Ping(struct drbd_connection *connection, struct packet_info *pi) |
5619 | { |
5620 | return drbd_send_ping_ack(connection); |
5621 | |
5622 | } |
5623 | |
5624 | static int got_PingAck(struct drbd_connection *connection, struct packet_info *pi) |
5625 | { |
5626 | /* restore idle timeout */ |
5627 | connection->meta.socket->sk->sk_rcvtimeo = connection->net_conf->ping_int*HZ; |
5628 | if (!test_and_set_bit(nr: GOT_PING_ACK, addr: &connection->flags)) |
5629 | wake_up(&connection->ping_wait); |
5630 | |
5631 | return 0; |
5632 | } |
5633 | |
5634 | static int got_IsInSync(struct drbd_connection *connection, struct packet_info *pi) |
5635 | { |
5636 | struct drbd_peer_device *peer_device; |
5637 | struct drbd_device *device; |
5638 | struct p_block_ack *p = pi->data; |
5639 | sector_t sector = be64_to_cpu(p->sector); |
5640 | int blksize = be32_to_cpu(p->blksize); |
5641 | |
5642 | peer_device = conn_peer_device(connection, volume_number: pi->vnr); |
5643 | if (!peer_device) |
5644 | return -EIO; |
5645 | device = peer_device->device; |
5646 | |
5647 | D_ASSERT(device, peer_device->connection->agreed_pro_version >= 89); |
5648 | |
5649 | update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
5650 | |
5651 | if (get_ldev(device)) { |
5652 | drbd_rs_complete_io(device, sector); |
5653 | drbd_set_in_sync(peer_device, sector, blksize); |
5654 | /* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */ |
5655 | device->rs_same_csum += (blksize >> BM_BLOCK_SHIFT); |
5656 | put_ldev(device); |
5657 | } |
5658 | dec_rs_pending(peer_device); |
5659 | atomic_add(i: blksize >> 9, v: &device->rs_sect_in); |
5660 | |
5661 | return 0; |
5662 | } |
5663 | |
5664 | static int |
5665 | validate_req_change_req_state(struct drbd_peer_device *peer_device, u64 id, sector_t sector, |
5666 | struct rb_root *root, const char *func, |
5667 | enum drbd_req_event what, bool missing_ok) |
5668 | { |
5669 | struct drbd_device *device = peer_device->device; |
5670 | struct drbd_request *req; |
5671 | struct bio_and_error m; |
5672 | |
5673 | spin_lock_irq(lock: &device->resource->req_lock); |
5674 | req = find_request(device, root, id, sector, missing_ok, func); |
5675 | if (unlikely(!req)) { |
5676 | spin_unlock_irq(lock: &device->resource->req_lock); |
5677 | return -EIO; |
5678 | } |
5679 | __req_mod(req, what, peer_device, m: &m); |
5680 | spin_unlock_irq(lock: &device->resource->req_lock); |
5681 | |
5682 | if (m.bio) |
5683 | complete_master_bio(device, m: &m); |
5684 | return 0; |
5685 | } |
5686 | |
5687 | static int got_BlockAck(struct drbd_connection *connection, struct packet_info *pi) |
5688 | { |
5689 | struct drbd_peer_device *peer_device; |
5690 | struct drbd_device *device; |
5691 | struct p_block_ack *p = pi->data; |
5692 | sector_t sector = be64_to_cpu(p->sector); |
5693 | int blksize = be32_to_cpu(p->blksize); |
5694 | enum drbd_req_event what; |
5695 | |
5696 | peer_device = conn_peer_device(connection, volume_number: pi->vnr); |
5697 | if (!peer_device) |
5698 | return -EIO; |
5699 | device = peer_device->device; |
5700 | |
5701 | update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
5702 | |
5703 | if (p->block_id == ID_SYNCER) { |
5704 | drbd_set_in_sync(peer_device, sector, blksize); |
5705 | dec_rs_pending(peer_device); |
5706 | return 0; |
5707 | } |
5708 | switch (pi->cmd) { |
5709 | case P_RS_WRITE_ACK: |
5710 | what = WRITE_ACKED_BY_PEER_AND_SIS; |
5711 | break; |
5712 | case P_WRITE_ACK: |
5713 | what = WRITE_ACKED_BY_PEER; |
5714 | break; |
5715 | case P_RECV_ACK: |
5716 | what = RECV_ACKED_BY_PEER; |
5717 | break; |
5718 | case P_SUPERSEDED: |
5719 | what = CONFLICT_RESOLVED; |
5720 | break; |
5721 | case P_RETRY_WRITE: |
5722 | what = POSTPONE_WRITE; |
5723 | break; |
5724 | default: |
5725 | BUG(); |
5726 | } |
5727 | |
5728 | return validate_req_change_req_state(peer_device, id: p->block_id, sector, |
5729 | root: &device->write_requests, func: __func__, |
5730 | what, missing_ok: false); |
5731 | } |
5732 | |
5733 | static int got_NegAck(struct drbd_connection *connection, struct packet_info *pi) |
5734 | { |
5735 | struct drbd_peer_device *peer_device; |
5736 | struct drbd_device *device; |
5737 | struct p_block_ack *p = pi->data; |
5738 | sector_t sector = be64_to_cpu(p->sector); |
5739 | int size = be32_to_cpu(p->blksize); |
5740 | int err; |
5741 | |
5742 | peer_device = conn_peer_device(connection, volume_number: pi->vnr); |
5743 | if (!peer_device) |
5744 | return -EIO; |
5745 | device = peer_device->device; |
5746 | |
5747 | update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
5748 | |
5749 | if (p->block_id == ID_SYNCER) { |
5750 | dec_rs_pending(peer_device); |
5751 | drbd_rs_failed_io(peer_device, sector, size); |
5752 | return 0; |
5753 | } |
5754 | |
5755 | err = validate_req_change_req_state(peer_device, id: p->block_id, sector, |
5756 | root: &device->write_requests, func: __func__, |
5757 | what: NEG_ACKED, missing_ok: true); |
5758 | if (err) { |
5759 | /* Protocol A has no P_WRITE_ACKs, but has P_NEG_ACKs. |
5760 | The master bio might already be completed, therefore the |
5761 | request is no longer in the collision hash. */ |
5762 | /* In Protocol B we might already have got a P_RECV_ACK |
5763 | but then get a P_NEG_ACK afterwards. */ |
5764 | drbd_set_out_of_sync(peer_device, sector, size); |
5765 | } |
5766 | return 0; |
5767 | } |
5768 | |
5769 | static int got_NegDReply(struct drbd_connection *connection, struct packet_info *pi) |
5770 | { |
5771 | struct drbd_peer_device *peer_device; |
5772 | struct drbd_device *device; |
5773 | struct p_block_ack *p = pi->data; |
5774 | sector_t sector = be64_to_cpu(p->sector); |
5775 | |
5776 | peer_device = conn_peer_device(connection, volume_number: pi->vnr); |
5777 | if (!peer_device) |
5778 | return -EIO; |
5779 | device = peer_device->device; |
5780 | |
5781 | update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
5782 | |
5783 | drbd_err(device, "Got NegDReply; Sector %llus, len %u.\n" , |
5784 | (unsigned long long)sector, be32_to_cpu(p->blksize)); |
5785 | |
5786 | return validate_req_change_req_state(peer_device, id: p->block_id, sector, |
5787 | root: &device->read_requests, func: __func__, |
5788 | what: NEG_ACKED, missing_ok: false); |
5789 | } |
5790 | |
5791 | static int got_NegRSDReply(struct drbd_connection *connection, struct packet_info *pi) |
5792 | { |
5793 | struct drbd_peer_device *peer_device; |
5794 | struct drbd_device *device; |
5795 | sector_t sector; |
5796 | int size; |
5797 | struct p_block_ack *p = pi->data; |
5798 | |
5799 | peer_device = conn_peer_device(connection, volume_number: pi->vnr); |
5800 | if (!peer_device) |
5801 | return -EIO; |
5802 | device = peer_device->device; |
5803 | |
5804 | sector = be64_to_cpu(p->sector); |
5805 | size = be32_to_cpu(p->blksize); |
5806 | |
5807 | update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
5808 | |
5809 | dec_rs_pending(peer_device); |
5810 | |
5811 | if (get_ldev_if_state(device, D_FAILED)) { |
5812 | drbd_rs_complete_io(device, sector); |
5813 | switch (pi->cmd) { |
5814 | case P_NEG_RS_DREPLY: |
5815 | drbd_rs_failed_io(peer_device, sector, size); |
5816 | break; |
5817 | case P_RS_CANCEL: |
5818 | break; |
5819 | default: |
5820 | BUG(); |
5821 | } |
5822 | put_ldev(device); |
5823 | } |
5824 | |
5825 | return 0; |
5826 | } |
5827 | |
5828 | static int got_BarrierAck(struct drbd_connection *connection, struct packet_info *pi) |
5829 | { |
5830 | struct p_barrier_ack *p = pi->data; |
5831 | struct drbd_peer_device *peer_device; |
5832 | int vnr; |
5833 | |
5834 | tl_release(connection, barrier_nr: p->barrier, be32_to_cpu(p->set_size)); |
5835 | |
5836 | rcu_read_lock(); |
5837 | idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
5838 | struct drbd_device *device = peer_device->device; |
5839 | |
5840 | if (device->state.conn == C_AHEAD && |
5841 | atomic_read(v: &device->ap_in_flight) == 0 && |
5842 | !test_and_set_bit(nr: AHEAD_TO_SYNC_SOURCE, addr: &device->flags)) { |
5843 | device->start_resync_timer.expires = jiffies + HZ; |
5844 | add_timer(timer: &device->start_resync_timer); |
5845 | } |
5846 | } |
5847 | rcu_read_unlock(); |
5848 | |
5849 | return 0; |
5850 | } |
5851 | |
5852 | static int got_OVResult(struct drbd_connection *connection, struct packet_info *pi) |
5853 | { |
5854 | struct drbd_peer_device *peer_device; |
5855 | struct drbd_device *device; |
5856 | struct p_block_ack *p = pi->data; |
5857 | struct drbd_device_work *dw; |
5858 | sector_t sector; |
5859 | int size; |
5860 | |
5861 | peer_device = conn_peer_device(connection, volume_number: pi->vnr); |
5862 | if (!peer_device) |
5863 | return -EIO; |
5864 | device = peer_device->device; |
5865 | |
5866 | sector = be64_to_cpu(p->sector); |
5867 | size = be32_to_cpu(p->blksize); |
5868 | |
5869 | update_peer_seq(peer_device, be32_to_cpu(p->seq_num)); |
5870 | |
5871 | if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC) |
5872 | drbd_ov_out_of_sync_found(peer_device, sector, size); |
5873 | else |
5874 | ov_out_of_sync_print(peer_device); |
5875 | |
5876 | if (!get_ldev(device)) |
5877 | return 0; |
5878 | |
5879 | drbd_rs_complete_io(device, sector); |
5880 | dec_rs_pending(peer_device); |
5881 | |
5882 | --device->ov_left; |
5883 | |
5884 | /* let's advance progress step marks only for every other megabyte */ |
5885 | if ((device->ov_left & 0x200) == 0x200) |
5886 | drbd_advance_rs_marks(peer_device, still_to_go: device->ov_left); |
5887 | |
5888 | if (device->ov_left == 0) { |
5889 | dw = kmalloc(size: sizeof(*dw), GFP_NOIO); |
5890 | if (dw) { |
5891 | dw->w.cb = w_ov_finished; |
5892 | dw->device = device; |
5893 | drbd_queue_work(q: &peer_device->connection->sender_work, w: &dw->w); |
5894 | } else { |
5895 | drbd_err(device, "kmalloc(dw) failed." ); |
5896 | ov_out_of_sync_print(peer_device); |
5897 | drbd_resync_finished(peer_device); |
5898 | } |
5899 | } |
5900 | put_ldev(device); |
5901 | return 0; |
5902 | } |
5903 | |
5904 | static int got_skip(struct drbd_connection *connection, struct packet_info *pi) |
5905 | { |
5906 | return 0; |
5907 | } |
5908 | |
5909 | struct meta_sock_cmd { |
5910 | size_t pkt_size; |
5911 | int (*fn)(struct drbd_connection *connection, struct packet_info *); |
5912 | }; |
5913 | |
5914 | static void set_rcvtimeo(struct drbd_connection *connection, bool ping_timeout) |
5915 | { |
5916 | long t; |
5917 | struct net_conf *nc; |
5918 | |
5919 | rcu_read_lock(); |
5920 | nc = rcu_dereference(connection->net_conf); |
5921 | t = ping_timeout ? nc->ping_timeo : nc->ping_int; |
5922 | rcu_read_unlock(); |
5923 | |
5924 | t *= HZ; |
5925 | if (ping_timeout) |
5926 | t /= 10; |
5927 | |
5928 | connection->meta.socket->sk->sk_rcvtimeo = t; |
5929 | } |
5930 | |
5931 | static void set_ping_timeout(struct drbd_connection *connection) |
5932 | { |
5933 | set_rcvtimeo(connection, ping_timeout: 1); |
5934 | } |
5935 | |
5936 | static void set_idle_timeout(struct drbd_connection *connection) |
5937 | { |
5938 | set_rcvtimeo(connection, ping_timeout: 0); |
5939 | } |
5940 | |
5941 | static struct meta_sock_cmd ack_receiver_tbl[] = { |
5942 | [P_PING] = { 0, got_Ping }, |
5943 | [P_PING_ACK] = { .pkt_size: 0, .fn: got_PingAck }, |
5944 | [P_RECV_ACK] = { .pkt_size: sizeof(struct p_block_ack), .fn: got_BlockAck }, |
5945 | [P_WRITE_ACK] = { .pkt_size: sizeof(struct p_block_ack), .fn: got_BlockAck }, |
5946 | [P_RS_WRITE_ACK] = { .pkt_size: sizeof(struct p_block_ack), .fn: got_BlockAck }, |
5947 | [P_SUPERSEDED] = { .pkt_size: sizeof(struct p_block_ack), .fn: got_BlockAck }, |
5948 | [P_NEG_ACK] = { .pkt_size: sizeof(struct p_block_ack), .fn: got_NegAck }, |
5949 | [P_NEG_DREPLY] = { .pkt_size: sizeof(struct p_block_ack), .fn: got_NegDReply }, |
5950 | [P_NEG_RS_DREPLY] = { .pkt_size: sizeof(struct p_block_ack), .fn: got_NegRSDReply }, |
5951 | [P_OV_RESULT] = { .pkt_size: sizeof(struct p_block_ack), .fn: got_OVResult }, |
5952 | [P_BARRIER_ACK] = { .pkt_size: sizeof(struct p_barrier_ack), .fn: got_BarrierAck }, |
5953 | [P_STATE_CHG_REPLY] = { .pkt_size: sizeof(struct p_req_state_reply), .fn: got_RqSReply }, |
5954 | [P_RS_IS_IN_SYNC] = { .pkt_size: sizeof(struct p_block_ack), .fn: got_IsInSync }, |
5955 | [P_DELAY_PROBE] = { .pkt_size: sizeof(struct p_delay_probe93), .fn: got_skip }, |
5956 | [P_RS_CANCEL] = { .pkt_size: sizeof(struct p_block_ack), .fn: got_NegRSDReply }, |
5957 | [P_CONN_ST_CHG_REPLY]={ .pkt_size: sizeof(struct p_req_state_reply), .fn: got_conn_RqSReply }, |
5958 | [P_RETRY_WRITE] = { .pkt_size: sizeof(struct p_block_ack), .fn: got_BlockAck }, |
5959 | }; |
5960 | |
5961 | int drbd_ack_receiver(struct drbd_thread *thi) |
5962 | { |
5963 | struct drbd_connection *connection = thi->connection; |
5964 | struct meta_sock_cmd *cmd = NULL; |
5965 | struct packet_info pi; |
5966 | unsigned long pre_recv_jif; |
5967 | int rv; |
5968 | void *buf = connection->meta.rbuf; |
5969 | int received = 0; |
5970 | unsigned int = drbd_header_size(connection); |
5971 | int expect = header_size; |
5972 | bool ping_timeout_active = false; |
5973 | |
5974 | sched_set_fifo_low(current); |
5975 | |
5976 | while (get_t_state(thi) == RUNNING) { |
5977 | drbd_thread_current_set_cpu(thi); |
5978 | |
5979 | conn_reclaim_net_peer_reqs(connection); |
5980 | |
5981 | if (test_and_clear_bit(nr: SEND_PING, addr: &connection->flags)) { |
5982 | if (drbd_send_ping(connection)) { |
5983 | drbd_err(connection, "drbd_send_ping has failed\n" ); |
5984 | goto reconnect; |
5985 | } |
5986 | set_ping_timeout(connection); |
5987 | ping_timeout_active = true; |
5988 | } |
5989 | |
5990 | pre_recv_jif = jiffies; |
5991 | rv = drbd_recv_short(sock: connection->meta.socket, buf, size: expect-received, flags: 0); |
5992 | |
5993 | /* Note: |
5994 | * -EINTR (on meta) we got a signal |
5995 | * -EAGAIN (on meta) rcvtimeo expired |
5996 | * -ECONNRESET other side closed the connection |
5997 | * -ERESTARTSYS (on data) we got a signal |
5998 | * rv < 0 other than above: unexpected error! |
5999 | * rv == expected: full header or command |
6000 | * rv < expected: "woken" by signal during receive |
6001 | * rv == 0 : "connection shut down by peer" |
6002 | */ |
6003 | if (likely(rv > 0)) { |
6004 | received += rv; |
6005 | buf += rv; |
6006 | } else if (rv == 0) { |
6007 | if (test_bit(DISCONNECT_SENT, &connection->flags)) { |
6008 | long t; |
6009 | rcu_read_lock(); |
6010 | t = rcu_dereference(connection->net_conf)->ping_timeo * HZ/10; |
6011 | rcu_read_unlock(); |
6012 | |
6013 | t = wait_event_timeout(connection->ping_wait, |
6014 | connection->cstate < C_WF_REPORT_PARAMS, |
6015 | t); |
6016 | if (t) |
6017 | break; |
6018 | } |
6019 | drbd_err(connection, "meta connection shut down by peer.\n" ); |
6020 | goto reconnect; |
6021 | } else if (rv == -EAGAIN) { |
6022 | /* If the data socket received something meanwhile, |
6023 | * that is good enough: peer is still alive. */ |
6024 | if (time_after(connection->last_received, pre_recv_jif)) |
6025 | continue; |
6026 | if (ping_timeout_active) { |
6027 | drbd_err(connection, "PingAck did not arrive in time.\n" ); |
6028 | goto reconnect; |
6029 | } |
6030 | set_bit(nr: SEND_PING, addr: &connection->flags); |
6031 | continue; |
6032 | } else if (rv == -EINTR) { |
6033 | /* maybe drbd_thread_stop(): the while condition will notice. |
6034 | * maybe woken for send_ping: we'll send a ping above, |
6035 | * and change the rcvtimeo */ |
6036 | flush_signals(current); |
6037 | continue; |
6038 | } else { |
6039 | drbd_err(connection, "sock_recvmsg returned %d\n" , rv); |
6040 | goto reconnect; |
6041 | } |
6042 | |
6043 | if (received == expect && cmd == NULL) { |
6044 | if (decode_header(connection, header: connection->meta.rbuf, pi: &pi)) |
6045 | goto reconnect; |
6046 | cmd = &ack_receiver_tbl[pi.cmd]; |
6047 | if (pi.cmd >= ARRAY_SIZE(ack_receiver_tbl) || !cmd->fn) { |
6048 | drbd_err(connection, "Unexpected meta packet %s (0x%04x)\n" , |
6049 | cmdname(pi.cmd), pi.cmd); |
6050 | goto disconnect; |
6051 | } |
6052 | expect = header_size + cmd->pkt_size; |
6053 | if (pi.size != expect - header_size) { |
6054 | drbd_err(connection, "Wrong packet size on meta (c: %d, l: %d)\n" , |
6055 | pi.cmd, pi.size); |
6056 | goto reconnect; |
6057 | } |
6058 | } |
6059 | if (received == expect) { |
6060 | bool err; |
6061 | |
6062 | err = cmd->fn(connection, &pi); |
6063 | if (err) { |
6064 | drbd_err(connection, "%ps failed\n" , cmd->fn); |
6065 | goto reconnect; |
6066 | } |
6067 | |
6068 | connection->last_received = jiffies; |
6069 | |
6070 | if (cmd == &ack_receiver_tbl[P_PING_ACK]) { |
6071 | set_idle_timeout(connection); |
6072 | ping_timeout_active = false; |
6073 | } |
6074 | |
6075 | buf = connection->meta.rbuf; |
6076 | received = 0; |
6077 | expect = header_size; |
6078 | cmd = NULL; |
6079 | } |
6080 | } |
6081 | |
6082 | if (0) { |
6083 | reconnect: |
6084 | conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), flags: CS_HARD); |
6085 | conn_md_sync(connection); |
6086 | } |
6087 | if (0) { |
6088 | disconnect: |
6089 | conn_request_state(connection, NS(conn, C_DISCONNECTING), flags: CS_HARD); |
6090 | } |
6091 | |
6092 | drbd_info(connection, "ack_receiver terminated\n" ); |
6093 | |
6094 | return 0; |
6095 | } |
6096 | |
6097 | void drbd_send_acks_wf(struct work_struct *ws) |
6098 | { |
6099 | struct drbd_peer_device *peer_device = |
6100 | container_of(ws, struct drbd_peer_device, send_acks_work); |
6101 | struct drbd_connection *connection = peer_device->connection; |
6102 | struct drbd_device *device = peer_device->device; |
6103 | struct net_conf *nc; |
6104 | int tcp_cork, err; |
6105 | |
6106 | rcu_read_lock(); |
6107 | nc = rcu_dereference(connection->net_conf); |
6108 | tcp_cork = nc->tcp_cork; |
6109 | rcu_read_unlock(); |
6110 | |
6111 | if (tcp_cork) |
6112 | tcp_sock_set_cork(sk: connection->meta.socket->sk, on: true); |
6113 | |
6114 | err = drbd_finish_peer_reqs(device); |
6115 | kref_put(kref: &device->kref, release: drbd_destroy_device); |
6116 | /* get is in drbd_endio_write_sec_final(). That is necessary to keep the |
6117 | struct work_struct send_acks_work alive, which is in the peer_device object */ |
6118 | |
6119 | if (err) { |
6120 | conn_request_state(connection, NS(conn, C_NETWORK_FAILURE), flags: CS_HARD); |
6121 | return; |
6122 | } |
6123 | |
6124 | if (tcp_cork) |
6125 | tcp_sock_set_cork(sk: connection->meta.socket->sk, on: false); |
6126 | |
6127 | return; |
6128 | } |
6129 | |