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Commit | Line | Data |
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b411b363 PR |
1 | /* |
2 | drbd_worker.c | |
3 | ||
4 | This file is part of DRBD by Philipp Reisner and Lars Ellenberg. | |
5 | ||
6 | Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. | |
7 | Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>. | |
8 | Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. | |
9 | ||
10 | drbd is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 2, or (at your option) | |
13 | any later version. | |
14 | ||
15 | drbd is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
21 | along with drbd; see the file COPYING. If not, write to | |
22 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
23 | ||
24 | */ | |
25 | ||
b411b363 | 26 | #include <linux/module.h> |
b411b363 PR |
27 | #include <linux/drbd.h> |
28 | #include <linux/sched.h> | |
b411b363 PR |
29 | #include <linux/wait.h> |
30 | #include <linux/mm.h> | |
31 | #include <linux/memcontrol.h> | |
32 | #include <linux/mm_inline.h> | |
33 | #include <linux/slab.h> | |
34 | #include <linux/random.h> | |
b411b363 PR |
35 | #include <linux/string.h> |
36 | #include <linux/scatterlist.h> | |
37 | ||
38 | #include "drbd_int.h" | |
39 | #include "drbd_req.h" | |
b411b363 | 40 | |
00d56944 PR |
41 | static int w_make_ov_request(struct drbd_work *w, int cancel); |
42 | static int w_make_resync_request(struct drbd_work *w, int cancel); | |
b411b363 PR |
43 | |
44 | ||
45 | ||
c5a91619 AG |
46 | /* endio handlers: |
47 | * drbd_md_io_complete (defined here) | |
fcefa62e AG |
48 | * drbd_request_endio (defined here) |
49 | * drbd_peer_request_endio (defined here) | |
c5a91619 AG |
50 | * bm_async_io_complete (defined in drbd_bitmap.c) |
51 | * | |
b411b363 PR |
52 | * For all these callbacks, note the following: |
53 | * The callbacks will be called in irq context by the IDE drivers, | |
54 | * and in Softirqs/Tasklets/BH context by the SCSI drivers. | |
55 | * Try to get the locking right :) | |
56 | * | |
57 | */ | |
58 | ||
59 | ||
60 | /* About the global_state_lock | |
61 | Each state transition on an device holds a read lock. In case we have | |
62 | to evaluate the sync after dependencies, we grab a write lock, because | |
63 | we need stable states on all devices for that. */ | |
64 | rwlock_t global_state_lock; | |
65 | ||
66 | /* used for synchronous meta data and bitmap IO | |
67 | * submitted by drbd_md_sync_page_io() | |
68 | */ | |
69 | void drbd_md_io_complete(struct bio *bio, int error) | |
70 | { | |
71 | struct drbd_md_io *md_io; | |
72 | ||
73 | md_io = (struct drbd_md_io *)bio->bi_private; | |
74 | md_io->error = error; | |
75 | ||
b411b363 PR |
76 | complete(&md_io->event); |
77 | } | |
78 | ||
79 | /* reads on behalf of the partner, | |
80 | * "submitted" by the receiver | |
81 | */ | |
db830c46 | 82 | void drbd_endio_read_sec_final(struct drbd_peer_request *peer_req) __releases(local) |
b411b363 PR |
83 | { |
84 | unsigned long flags = 0; | |
a21e9298 | 85 | struct drbd_conf *mdev = peer_req->w.mdev; |
b411b363 | 86 | |
87eeee41 | 87 | spin_lock_irqsave(&mdev->tconn->req_lock, flags); |
db830c46 AG |
88 | mdev->read_cnt += peer_req->i.size >> 9; |
89 | list_del(&peer_req->w.list); | |
b411b363 PR |
90 | if (list_empty(&mdev->read_ee)) |
91 | wake_up(&mdev->ee_wait); | |
db830c46 | 92 | if (test_bit(__EE_WAS_ERROR, &peer_req->flags)) |
81e84650 | 93 | __drbd_chk_io_error(mdev, false); |
87eeee41 | 94 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); |
b411b363 | 95 | |
db830c46 | 96 | drbd_queue_work(&mdev->tconn->data.work, &peer_req->w); |
b411b363 | 97 | put_ldev(mdev); |
b411b363 PR |
98 | } |
99 | ||
100 | /* writes on behalf of the partner, or resync writes, | |
45bb912b | 101 | * "submitted" by the receiver, final stage. */ |
db830c46 | 102 | static void drbd_endio_write_sec_final(struct drbd_peer_request *peer_req) __releases(local) |
b411b363 PR |
103 | { |
104 | unsigned long flags = 0; | |
a21e9298 | 105 | struct drbd_conf *mdev = peer_req->w.mdev; |
b411b363 PR |
106 | sector_t e_sector; |
107 | int do_wake; | |
579b57ed | 108 | u64 block_id; |
b411b363 | 109 | int do_al_complete_io; |
b411b363 | 110 | |
db830c46 | 111 | /* after we moved peer_req to done_ee, |
b411b363 PR |
112 | * we may no longer access it, |
113 | * it may be freed/reused already! | |
114 | * (as soon as we release the req_lock) */ | |
db830c46 AG |
115 | e_sector = peer_req->i.sector; |
116 | do_al_complete_io = peer_req->flags & EE_CALL_AL_COMPLETE_IO; | |
117 | block_id = peer_req->block_id; | |
b411b363 | 118 | |
87eeee41 | 119 | spin_lock_irqsave(&mdev->tconn->req_lock, flags); |
db830c46 AG |
120 | mdev->writ_cnt += peer_req->i.size >> 9; |
121 | list_del(&peer_req->w.list); /* has been on active_ee or sync_ee */ | |
122 | list_add_tail(&peer_req->w.list, &mdev->done_ee); | |
b411b363 | 123 | |
bb3bfe96 | 124 | /* |
5e472264 | 125 | * Do not remove from the write_requests tree here: we did not send the |
bb3bfe96 AG |
126 | * Ack yet and did not wake possibly waiting conflicting requests. |
127 | * Removed from the tree from "drbd_process_done_ee" within the | |
128 | * appropriate w.cb (e_end_block/e_end_resync_block) or from | |
129 | * _drbd_clear_done_ee. | |
130 | */ | |
b411b363 | 131 | |
579b57ed | 132 | do_wake = list_empty(block_id == ID_SYNCER ? &mdev->sync_ee : &mdev->active_ee); |
b411b363 | 133 | |
db830c46 | 134 | if (test_bit(__EE_WAS_ERROR, &peer_req->flags)) |
81e84650 | 135 | __drbd_chk_io_error(mdev, false); |
87eeee41 | 136 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); |
b411b363 | 137 | |
579b57ed | 138 | if (block_id == ID_SYNCER) |
b411b363 PR |
139 | drbd_rs_complete_io(mdev, e_sector); |
140 | ||
141 | if (do_wake) | |
142 | wake_up(&mdev->ee_wait); | |
143 | ||
144 | if (do_al_complete_io) | |
145 | drbd_al_complete_io(mdev, e_sector); | |
146 | ||
0625ac19 | 147 | wake_asender(mdev->tconn); |
b411b363 | 148 | put_ldev(mdev); |
45bb912b | 149 | } |
b411b363 | 150 | |
45bb912b LE |
151 | /* writes on behalf of the partner, or resync writes, |
152 | * "submitted" by the receiver. | |
153 | */ | |
fcefa62e | 154 | void drbd_peer_request_endio(struct bio *bio, int error) |
45bb912b | 155 | { |
db830c46 | 156 | struct drbd_peer_request *peer_req = bio->bi_private; |
a21e9298 | 157 | struct drbd_conf *mdev = peer_req->w.mdev; |
45bb912b LE |
158 | int uptodate = bio_flagged(bio, BIO_UPTODATE); |
159 | int is_write = bio_data_dir(bio) == WRITE; | |
160 | ||
07194272 | 161 | if (error && __ratelimit(&drbd_ratelimit_state)) |
45bb912b LE |
162 | dev_warn(DEV, "%s: error=%d s=%llus\n", |
163 | is_write ? "write" : "read", error, | |
db830c46 | 164 | (unsigned long long)peer_req->i.sector); |
45bb912b | 165 | if (!error && !uptodate) { |
07194272 LE |
166 | if (__ratelimit(&drbd_ratelimit_state)) |
167 | dev_warn(DEV, "%s: setting error to -EIO s=%llus\n", | |
168 | is_write ? "write" : "read", | |
db830c46 | 169 | (unsigned long long)peer_req->i.sector); |
45bb912b LE |
170 | /* strange behavior of some lower level drivers... |
171 | * fail the request by clearing the uptodate flag, | |
172 | * but do not return any error?! */ | |
173 | error = -EIO; | |
174 | } | |
175 | ||
176 | if (error) | |
db830c46 | 177 | set_bit(__EE_WAS_ERROR, &peer_req->flags); |
45bb912b LE |
178 | |
179 | bio_put(bio); /* no need for the bio anymore */ | |
db830c46 | 180 | if (atomic_dec_and_test(&peer_req->pending_bios)) { |
45bb912b | 181 | if (is_write) |
db830c46 | 182 | drbd_endio_write_sec_final(peer_req); |
45bb912b | 183 | else |
db830c46 | 184 | drbd_endio_read_sec_final(peer_req); |
45bb912b | 185 | } |
b411b363 PR |
186 | } |
187 | ||
188 | /* read, readA or write requests on R_PRIMARY coming from drbd_make_request | |
189 | */ | |
fcefa62e | 190 | void drbd_request_endio(struct bio *bio, int error) |
b411b363 | 191 | { |
a115413d | 192 | unsigned long flags; |
b411b363 | 193 | struct drbd_request *req = bio->bi_private; |
a21e9298 | 194 | struct drbd_conf *mdev = req->w.mdev; |
a115413d | 195 | struct bio_and_error m; |
b411b363 PR |
196 | enum drbd_req_event what; |
197 | int uptodate = bio_flagged(bio, BIO_UPTODATE); | |
198 | ||
b411b363 PR |
199 | if (!error && !uptodate) { |
200 | dev_warn(DEV, "p %s: setting error to -EIO\n", | |
201 | bio_data_dir(bio) == WRITE ? "write" : "read"); | |
202 | /* strange behavior of some lower level drivers... | |
203 | * fail the request by clearing the uptodate flag, | |
204 | * but do not return any error?! */ | |
205 | error = -EIO; | |
206 | } | |
207 | ||
b411b363 PR |
208 | /* to avoid recursion in __req_mod */ |
209 | if (unlikely(error)) { | |
210 | what = (bio_data_dir(bio) == WRITE) | |
8554df1c | 211 | ? WRITE_COMPLETED_WITH_ERROR |
5c3c7e64 | 212 | : (bio_rw(bio) == READ) |
8554df1c AG |
213 | ? READ_COMPLETED_WITH_ERROR |
214 | : READ_AHEAD_COMPLETED_WITH_ERROR; | |
b411b363 | 215 | } else |
8554df1c | 216 | what = COMPLETED_OK; |
b411b363 PR |
217 | |
218 | bio_put(req->private_bio); | |
219 | req->private_bio = ERR_PTR(error); | |
220 | ||
a115413d | 221 | /* not req_mod(), we need irqsave here! */ |
87eeee41 | 222 | spin_lock_irqsave(&mdev->tconn->req_lock, flags); |
a115413d | 223 | __req_mod(req, what, &m); |
87eeee41 | 224 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); |
a115413d LE |
225 | |
226 | if (m.bio) | |
227 | complete_master_bio(mdev, &m); | |
b411b363 PR |
228 | } |
229 | ||
00d56944 | 230 | int w_read_retry_remote(struct drbd_work *w, int cancel) |
b411b363 PR |
231 | { |
232 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
00d56944 | 233 | struct drbd_conf *mdev = w->mdev; |
b411b363 PR |
234 | |
235 | /* We should not detach for read io-error, | |
236 | * but try to WRITE the P_DATA_REPLY to the failed location, | |
237 | * to give the disk the chance to relocate that block */ | |
238 | ||
87eeee41 | 239 | spin_lock_irq(&mdev->tconn->req_lock); |
d255e5ff | 240 | if (cancel || mdev->state.pdsk != D_UP_TO_DATE) { |
8554df1c | 241 | _req_mod(req, READ_RETRY_REMOTE_CANCELED); |
87eeee41 | 242 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
243 | return 1; |
244 | } | |
87eeee41 | 245 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 246 | |
00d56944 | 247 | return w_send_read_req(w, 0); |
b411b363 PR |
248 | } |
249 | ||
f6ffca9f | 250 | void drbd_csum_ee(struct drbd_conf *mdev, struct crypto_hash *tfm, |
db830c46 | 251 | struct drbd_peer_request *peer_req, void *digest) |
45bb912b LE |
252 | { |
253 | struct hash_desc desc; | |
254 | struct scatterlist sg; | |
db830c46 | 255 | struct page *page = peer_req->pages; |
45bb912b LE |
256 | struct page *tmp; |
257 | unsigned len; | |
258 | ||
259 | desc.tfm = tfm; | |
260 | desc.flags = 0; | |
261 | ||
262 | sg_init_table(&sg, 1); | |
263 | crypto_hash_init(&desc); | |
264 | ||
265 | while ((tmp = page_chain_next(page))) { | |
266 | /* all but the last page will be fully used */ | |
267 | sg_set_page(&sg, page, PAGE_SIZE, 0); | |
268 | crypto_hash_update(&desc, &sg, sg.length); | |
269 | page = tmp; | |
270 | } | |
271 | /* and now the last, possibly only partially used page */ | |
db830c46 | 272 | len = peer_req->i.size & (PAGE_SIZE - 1); |
45bb912b LE |
273 | sg_set_page(&sg, page, len ?: PAGE_SIZE, 0); |
274 | crypto_hash_update(&desc, &sg, sg.length); | |
275 | crypto_hash_final(&desc, digest); | |
276 | } | |
277 | ||
278 | void drbd_csum_bio(struct drbd_conf *mdev, struct crypto_hash *tfm, struct bio *bio, void *digest) | |
b411b363 PR |
279 | { |
280 | struct hash_desc desc; | |
281 | struct scatterlist sg; | |
282 | struct bio_vec *bvec; | |
283 | int i; | |
284 | ||
285 | desc.tfm = tfm; | |
286 | desc.flags = 0; | |
287 | ||
288 | sg_init_table(&sg, 1); | |
289 | crypto_hash_init(&desc); | |
290 | ||
291 | __bio_for_each_segment(bvec, bio, i, 0) { | |
292 | sg_set_page(&sg, bvec->bv_page, bvec->bv_len, bvec->bv_offset); | |
293 | crypto_hash_update(&desc, &sg, sg.length); | |
294 | } | |
295 | crypto_hash_final(&desc, digest); | |
296 | } | |
297 | ||
9676c760 | 298 | /* MAYBE merge common code with w_e_end_ov_req */ |
00d56944 | 299 | static int w_e_send_csum(struct drbd_work *w, int cancel) |
b411b363 | 300 | { |
00d56944 PR |
301 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
302 | struct drbd_conf *mdev = w->mdev; | |
b411b363 PR |
303 | int digest_size; |
304 | void *digest; | |
53ea4331 | 305 | int ok = 1; |
b411b363 | 306 | |
53ea4331 LE |
307 | if (unlikely(cancel)) |
308 | goto out; | |
b411b363 | 309 | |
9676c760 | 310 | if (unlikely((peer_req->flags & EE_WAS_ERROR) != 0)) |
53ea4331 | 311 | goto out; |
b411b363 | 312 | |
53ea4331 LE |
313 | digest_size = crypto_hash_digestsize(mdev->csums_tfm); |
314 | digest = kmalloc(digest_size, GFP_NOIO); | |
315 | if (digest) { | |
db830c46 AG |
316 | sector_t sector = peer_req->i.sector; |
317 | unsigned int size = peer_req->i.size; | |
318 | drbd_csum_ee(mdev, mdev->csums_tfm, peer_req, digest); | |
9676c760 | 319 | /* Free peer_req and pages before send. |
53ea4331 LE |
320 | * In case we block on congestion, we could otherwise run into |
321 | * some distributed deadlock, if the other side blocks on | |
322 | * congestion as well, because our receiver blocks in | |
323 | * drbd_pp_alloc due to pp_in_use > max_buffers. */ | |
db830c46 AG |
324 | drbd_free_ee(mdev, peer_req); |
325 | peer_req = NULL; | |
53ea4331 LE |
326 | inc_rs_pending(mdev); |
327 | ok = drbd_send_drequest_csum(mdev, sector, size, | |
328 | digest, digest_size, | |
329 | P_CSUM_RS_REQUEST); | |
330 | kfree(digest); | |
331 | } else { | |
332 | dev_err(DEV, "kmalloc() of digest failed.\n"); | |
333 | ok = 0; | |
334 | } | |
b411b363 | 335 | |
53ea4331 | 336 | out: |
db830c46 AG |
337 | if (peer_req) |
338 | drbd_free_ee(mdev, peer_req); | |
b411b363 PR |
339 | |
340 | if (unlikely(!ok)) | |
341 | dev_err(DEV, "drbd_send_drequest(..., csum) failed\n"); | |
342 | return ok; | |
343 | } | |
344 | ||
345 | #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) | |
346 | ||
347 | static int read_for_csum(struct drbd_conf *mdev, sector_t sector, int size) | |
348 | { | |
db830c46 | 349 | struct drbd_peer_request *peer_req; |
b411b363 PR |
350 | |
351 | if (!get_ldev(mdev)) | |
80a40e43 | 352 | return -EIO; |
b411b363 | 353 | |
e3555d85 | 354 | if (drbd_rs_should_slow_down(mdev, sector)) |
0f0601f4 LE |
355 | goto defer; |
356 | ||
b411b363 PR |
357 | /* GFP_TRY, because if there is no memory available right now, this may |
358 | * be rescheduled for later. It is "only" background resync, after all. */ | |
db830c46 AG |
359 | peer_req = drbd_alloc_ee(mdev, ID_SYNCER /* unused */, sector, size, GFP_TRY); |
360 | if (!peer_req) | |
80a40e43 | 361 | goto defer; |
b411b363 | 362 | |
db830c46 | 363 | peer_req->w.cb = w_e_send_csum; |
87eeee41 | 364 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 | 365 | list_add(&peer_req->w.list, &mdev->read_ee); |
87eeee41 | 366 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 367 | |
0f0601f4 | 368 | atomic_add(size >> 9, &mdev->rs_sect_ev); |
fbe29dec | 369 | if (drbd_submit_peer_request(mdev, peer_req, READ, DRBD_FAULT_RS_RD) == 0) |
80a40e43 | 370 | return 0; |
b411b363 | 371 | |
10f6d992 LE |
372 | /* If it failed because of ENOMEM, retry should help. If it failed |
373 | * because bio_add_page failed (probably broken lower level driver), | |
374 | * retry may or may not help. | |
375 | * If it does not, you may need to force disconnect. */ | |
87eeee41 | 376 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 | 377 | list_del(&peer_req->w.list); |
87eeee41 | 378 | spin_unlock_irq(&mdev->tconn->req_lock); |
22cc37a9 | 379 | |
db830c46 | 380 | drbd_free_ee(mdev, peer_req); |
80a40e43 | 381 | defer: |
45bb912b | 382 | put_ldev(mdev); |
80a40e43 | 383 | return -EAGAIN; |
b411b363 PR |
384 | } |
385 | ||
00d56944 | 386 | int w_resync_timer(struct drbd_work *w, int cancel) |
b411b363 | 387 | { |
00d56944 | 388 | struct drbd_conf *mdev = w->mdev; |
63106d3c PR |
389 | switch (mdev->state.conn) { |
390 | case C_VERIFY_S: | |
00d56944 | 391 | w_make_ov_request(w, cancel); |
63106d3c PR |
392 | break; |
393 | case C_SYNC_TARGET: | |
00d56944 | 394 | w_make_resync_request(w, cancel); |
63106d3c | 395 | break; |
b411b363 PR |
396 | } |
397 | ||
794abb75 PR |
398 | return 1; |
399 | } | |
400 | ||
401 | void resync_timer_fn(unsigned long data) | |
402 | { | |
403 | struct drbd_conf *mdev = (struct drbd_conf *) data; | |
404 | ||
405 | if (list_empty(&mdev->resync_work.list)) | |
e42325a5 | 406 | drbd_queue_work(&mdev->tconn->data.work, &mdev->resync_work); |
b411b363 PR |
407 | } |
408 | ||
778f271d PR |
409 | static void fifo_set(struct fifo_buffer *fb, int value) |
410 | { | |
411 | int i; | |
412 | ||
413 | for (i = 0; i < fb->size; i++) | |
f10f2623 | 414 | fb->values[i] = value; |
778f271d PR |
415 | } |
416 | ||
417 | static int fifo_push(struct fifo_buffer *fb, int value) | |
418 | { | |
419 | int ov; | |
420 | ||
421 | ov = fb->values[fb->head_index]; | |
422 | fb->values[fb->head_index++] = value; | |
423 | ||
424 | if (fb->head_index >= fb->size) | |
425 | fb->head_index = 0; | |
426 | ||
427 | return ov; | |
428 | } | |
429 | ||
430 | static void fifo_add_val(struct fifo_buffer *fb, int value) | |
431 | { | |
432 | int i; | |
433 | ||
434 | for (i = 0; i < fb->size; i++) | |
435 | fb->values[i] += value; | |
436 | } | |
437 | ||
9d77a5fe | 438 | static int drbd_rs_controller(struct drbd_conf *mdev) |
778f271d PR |
439 | { |
440 | unsigned int sect_in; /* Number of sectors that came in since the last turn */ | |
441 | unsigned int want; /* The number of sectors we want in the proxy */ | |
442 | int req_sect; /* Number of sectors to request in this turn */ | |
443 | int correction; /* Number of sectors more we need in the proxy*/ | |
444 | int cps; /* correction per invocation of drbd_rs_controller() */ | |
445 | int steps; /* Number of time steps to plan ahead */ | |
446 | int curr_corr; | |
447 | int max_sect; | |
448 | ||
449 | sect_in = atomic_xchg(&mdev->rs_sect_in, 0); /* Number of sectors that came in */ | |
450 | mdev->rs_in_flight -= sect_in; | |
451 | ||
452 | spin_lock(&mdev->peer_seq_lock); /* get an atomic view on mdev->rs_plan_s */ | |
453 | ||
454 | steps = mdev->rs_plan_s.size; /* (mdev->sync_conf.c_plan_ahead * 10 * SLEEP_TIME) / HZ; */ | |
455 | ||
456 | if (mdev->rs_in_flight + sect_in == 0) { /* At start of resync */ | |
457 | want = ((mdev->sync_conf.rate * 2 * SLEEP_TIME) / HZ) * steps; | |
458 | } else { /* normal path */ | |
459 | want = mdev->sync_conf.c_fill_target ? mdev->sync_conf.c_fill_target : | |
460 | sect_in * mdev->sync_conf.c_delay_target * HZ / (SLEEP_TIME * 10); | |
461 | } | |
462 | ||
463 | correction = want - mdev->rs_in_flight - mdev->rs_planed; | |
464 | ||
465 | /* Plan ahead */ | |
466 | cps = correction / steps; | |
467 | fifo_add_val(&mdev->rs_plan_s, cps); | |
468 | mdev->rs_planed += cps * steps; | |
469 | ||
470 | /* What we do in this step */ | |
471 | curr_corr = fifo_push(&mdev->rs_plan_s, 0); | |
472 | spin_unlock(&mdev->peer_seq_lock); | |
473 | mdev->rs_planed -= curr_corr; | |
474 | ||
475 | req_sect = sect_in + curr_corr; | |
476 | if (req_sect < 0) | |
477 | req_sect = 0; | |
478 | ||
479 | max_sect = (mdev->sync_conf.c_max_rate * 2 * SLEEP_TIME) / HZ; | |
480 | if (req_sect > max_sect) | |
481 | req_sect = max_sect; | |
482 | ||
483 | /* | |
484 | dev_warn(DEV, "si=%u if=%d wa=%u co=%d st=%d cps=%d pl=%d cc=%d rs=%d\n", | |
485 | sect_in, mdev->rs_in_flight, want, correction, | |
486 | steps, cps, mdev->rs_planed, curr_corr, req_sect); | |
487 | */ | |
488 | ||
489 | return req_sect; | |
490 | } | |
491 | ||
9d77a5fe | 492 | static int drbd_rs_number_requests(struct drbd_conf *mdev) |
e65f440d LE |
493 | { |
494 | int number; | |
495 | if (mdev->rs_plan_s.size) { /* mdev->sync_conf.c_plan_ahead */ | |
496 | number = drbd_rs_controller(mdev) >> (BM_BLOCK_SHIFT - 9); | |
497 | mdev->c_sync_rate = number * HZ * (BM_BLOCK_SIZE / 1024) / SLEEP_TIME; | |
498 | } else { | |
499 | mdev->c_sync_rate = mdev->sync_conf.rate; | |
500 | number = SLEEP_TIME * mdev->c_sync_rate / ((BM_BLOCK_SIZE / 1024) * HZ); | |
501 | } | |
502 | ||
e65f440d LE |
503 | /* ignore the amount of pending requests, the resync controller should |
504 | * throttle down to incoming reply rate soon enough anyways. */ | |
505 | return number; | |
506 | } | |
507 | ||
00d56944 | 508 | static int w_make_resync_request(struct drbd_work *w, int cancel) |
b411b363 | 509 | { |
00d56944 | 510 | struct drbd_conf *mdev = w->mdev; |
b411b363 PR |
511 | unsigned long bit; |
512 | sector_t sector; | |
513 | const sector_t capacity = drbd_get_capacity(mdev->this_bdev); | |
1816a2b4 | 514 | int max_bio_size; |
e65f440d | 515 | int number, rollback_i, size; |
b411b363 | 516 | int align, queued, sndbuf; |
0f0601f4 | 517 | int i = 0; |
b411b363 PR |
518 | |
519 | if (unlikely(cancel)) | |
520 | return 1; | |
521 | ||
af85e8e8 LE |
522 | if (mdev->rs_total == 0) { |
523 | /* empty resync? */ | |
524 | drbd_resync_finished(mdev); | |
525 | return 1; | |
526 | } | |
527 | ||
b411b363 PR |
528 | if (!get_ldev(mdev)) { |
529 | /* Since we only need to access mdev->rsync a | |
530 | get_ldev_if_state(mdev,D_FAILED) would be sufficient, but | |
531 | to continue resync with a broken disk makes no sense at | |
532 | all */ | |
533 | dev_err(DEV, "Disk broke down during resync!\n"); | |
b411b363 PR |
534 | return 1; |
535 | } | |
536 | ||
0cfdd247 | 537 | max_bio_size = queue_max_hw_sectors(mdev->rq_queue) << 9; |
e65f440d LE |
538 | number = drbd_rs_number_requests(mdev); |
539 | if (number == 0) | |
0f0601f4 | 540 | goto requeue; |
b411b363 | 541 | |
b411b363 PR |
542 | for (i = 0; i < number; i++) { |
543 | /* Stop generating RS requests, when half of the send buffer is filled */ | |
e42325a5 PR |
544 | mutex_lock(&mdev->tconn->data.mutex); |
545 | if (mdev->tconn->data.socket) { | |
546 | queued = mdev->tconn->data.socket->sk->sk_wmem_queued; | |
547 | sndbuf = mdev->tconn->data.socket->sk->sk_sndbuf; | |
b411b363 PR |
548 | } else { |
549 | queued = 1; | |
550 | sndbuf = 0; | |
551 | } | |
e42325a5 | 552 | mutex_unlock(&mdev->tconn->data.mutex); |
b411b363 PR |
553 | if (queued > sndbuf / 2) |
554 | goto requeue; | |
555 | ||
556 | next_sector: | |
557 | size = BM_BLOCK_SIZE; | |
558 | bit = drbd_bm_find_next(mdev, mdev->bm_resync_fo); | |
559 | ||
4b0715f0 | 560 | if (bit == DRBD_END_OF_BITMAP) { |
b411b363 | 561 | mdev->bm_resync_fo = drbd_bm_bits(mdev); |
b411b363 PR |
562 | put_ldev(mdev); |
563 | return 1; | |
564 | } | |
565 | ||
566 | sector = BM_BIT_TO_SECT(bit); | |
567 | ||
e3555d85 PR |
568 | if (drbd_rs_should_slow_down(mdev, sector) || |
569 | drbd_try_rs_begin_io(mdev, sector)) { | |
b411b363 PR |
570 | mdev->bm_resync_fo = bit; |
571 | goto requeue; | |
572 | } | |
573 | mdev->bm_resync_fo = bit + 1; | |
574 | ||
575 | if (unlikely(drbd_bm_test_bit(mdev, bit) == 0)) { | |
576 | drbd_rs_complete_io(mdev, sector); | |
577 | goto next_sector; | |
578 | } | |
579 | ||
1816a2b4 | 580 | #if DRBD_MAX_BIO_SIZE > BM_BLOCK_SIZE |
b411b363 PR |
581 | /* try to find some adjacent bits. |
582 | * we stop if we have already the maximum req size. | |
583 | * | |
584 | * Additionally always align bigger requests, in order to | |
585 | * be prepared for all stripe sizes of software RAIDs. | |
b411b363 PR |
586 | */ |
587 | align = 1; | |
d207450c | 588 | rollback_i = i; |
b411b363 | 589 | for (;;) { |
1816a2b4 | 590 | if (size + BM_BLOCK_SIZE > max_bio_size) |
b411b363 PR |
591 | break; |
592 | ||
593 | /* Be always aligned */ | |
594 | if (sector & ((1<<(align+3))-1)) | |
595 | break; | |
596 | ||
597 | /* do not cross extent boundaries */ | |
598 | if (((bit+1) & BM_BLOCKS_PER_BM_EXT_MASK) == 0) | |
599 | break; | |
600 | /* now, is it actually dirty, after all? | |
601 | * caution, drbd_bm_test_bit is tri-state for some | |
602 | * obscure reason; ( b == 0 ) would get the out-of-band | |
603 | * only accidentally right because of the "oddly sized" | |
604 | * adjustment below */ | |
605 | if (drbd_bm_test_bit(mdev, bit+1) != 1) | |
606 | break; | |
607 | bit++; | |
608 | size += BM_BLOCK_SIZE; | |
609 | if ((BM_BLOCK_SIZE << align) <= size) | |
610 | align++; | |
611 | i++; | |
612 | } | |
613 | /* if we merged some, | |
614 | * reset the offset to start the next drbd_bm_find_next from */ | |
615 | if (size > BM_BLOCK_SIZE) | |
616 | mdev->bm_resync_fo = bit + 1; | |
617 | #endif | |
618 | ||
619 | /* adjust very last sectors, in case we are oddly sized */ | |
620 | if (sector + (size>>9) > capacity) | |
621 | size = (capacity-sector)<<9; | |
31890f4a | 622 | if (mdev->tconn->agreed_pro_version >= 89 && mdev->csums_tfm) { |
b411b363 | 623 | switch (read_for_csum(mdev, sector, size)) { |
80a40e43 | 624 | case -EIO: /* Disk failure */ |
b411b363 PR |
625 | put_ldev(mdev); |
626 | return 0; | |
80a40e43 | 627 | case -EAGAIN: /* allocation failed, or ldev busy */ |
b411b363 PR |
628 | drbd_rs_complete_io(mdev, sector); |
629 | mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); | |
d207450c | 630 | i = rollback_i; |
b411b363 | 631 | goto requeue; |
80a40e43 LE |
632 | case 0: |
633 | /* everything ok */ | |
634 | break; | |
635 | default: | |
636 | BUG(); | |
b411b363 PR |
637 | } |
638 | } else { | |
639 | inc_rs_pending(mdev); | |
640 | if (!drbd_send_drequest(mdev, P_RS_DATA_REQUEST, | |
641 | sector, size, ID_SYNCER)) { | |
642 | dev_err(DEV, "drbd_send_drequest() failed, aborting...\n"); | |
643 | dec_rs_pending(mdev); | |
644 | put_ldev(mdev); | |
645 | return 0; | |
646 | } | |
647 | } | |
648 | } | |
649 | ||
650 | if (mdev->bm_resync_fo >= drbd_bm_bits(mdev)) { | |
651 | /* last syncer _request_ was sent, | |
652 | * but the P_RS_DATA_REPLY not yet received. sync will end (and | |
653 | * next sync group will resume), as soon as we receive the last | |
654 | * resync data block, and the last bit is cleared. | |
655 | * until then resync "work" is "inactive" ... | |
656 | */ | |
b411b363 PR |
657 | put_ldev(mdev); |
658 | return 1; | |
659 | } | |
660 | ||
661 | requeue: | |
778f271d | 662 | mdev->rs_in_flight += (i << (BM_BLOCK_SHIFT - 9)); |
b411b363 PR |
663 | mod_timer(&mdev->resync_timer, jiffies + SLEEP_TIME); |
664 | put_ldev(mdev); | |
665 | return 1; | |
666 | } | |
667 | ||
00d56944 | 668 | static int w_make_ov_request(struct drbd_work *w, int cancel) |
b411b363 | 669 | { |
00d56944 | 670 | struct drbd_conf *mdev = w->mdev; |
b411b363 PR |
671 | int number, i, size; |
672 | sector_t sector; | |
673 | const sector_t capacity = drbd_get_capacity(mdev->this_bdev); | |
674 | ||
675 | if (unlikely(cancel)) | |
676 | return 1; | |
677 | ||
2649f080 | 678 | number = drbd_rs_number_requests(mdev); |
b411b363 PR |
679 | |
680 | sector = mdev->ov_position; | |
681 | for (i = 0; i < number; i++) { | |
682 | if (sector >= capacity) { | |
b411b363 PR |
683 | return 1; |
684 | } | |
685 | ||
686 | size = BM_BLOCK_SIZE; | |
687 | ||
e3555d85 PR |
688 | if (drbd_rs_should_slow_down(mdev, sector) || |
689 | drbd_try_rs_begin_io(mdev, sector)) { | |
b411b363 PR |
690 | mdev->ov_position = sector; |
691 | goto requeue; | |
692 | } | |
693 | ||
694 | if (sector + (size>>9) > capacity) | |
695 | size = (capacity-sector)<<9; | |
696 | ||
697 | inc_rs_pending(mdev); | |
698 | if (!drbd_send_ov_request(mdev, sector, size)) { | |
699 | dec_rs_pending(mdev); | |
700 | return 0; | |
701 | } | |
702 | sector += BM_SECT_PER_BIT; | |
703 | } | |
704 | mdev->ov_position = sector; | |
705 | ||
706 | requeue: | |
2649f080 | 707 | mdev->rs_in_flight += (i << (BM_BLOCK_SHIFT - 9)); |
b411b363 PR |
708 | mod_timer(&mdev->resync_timer, jiffies + SLEEP_TIME); |
709 | return 1; | |
710 | } | |
711 | ||
00d56944 | 712 | int w_ov_finished(struct drbd_work *w, int cancel) |
b411b363 | 713 | { |
00d56944 | 714 | struct drbd_conf *mdev = w->mdev; |
b411b363 PR |
715 | kfree(w); |
716 | ov_oos_print(mdev); | |
717 | drbd_resync_finished(mdev); | |
718 | ||
719 | return 1; | |
720 | } | |
721 | ||
00d56944 | 722 | static int w_resync_finished(struct drbd_work *w, int cancel) |
b411b363 | 723 | { |
00d56944 | 724 | struct drbd_conf *mdev = w->mdev; |
b411b363 PR |
725 | kfree(w); |
726 | ||
727 | drbd_resync_finished(mdev); | |
728 | ||
729 | return 1; | |
730 | } | |
731 | ||
af85e8e8 LE |
732 | static void ping_peer(struct drbd_conf *mdev) |
733 | { | |
2a67d8b9 PR |
734 | struct drbd_tconn *tconn = mdev->tconn; |
735 | ||
736 | clear_bit(GOT_PING_ACK, &tconn->flags); | |
737 | request_ping(tconn); | |
738 | wait_event(tconn->ping_wait, | |
739 | test_bit(GOT_PING_ACK, &tconn->flags) || mdev->state.conn < C_CONNECTED); | |
af85e8e8 LE |
740 | } |
741 | ||
b411b363 PR |
742 | int drbd_resync_finished(struct drbd_conf *mdev) |
743 | { | |
744 | unsigned long db, dt, dbdt; | |
745 | unsigned long n_oos; | |
746 | union drbd_state os, ns; | |
747 | struct drbd_work *w; | |
748 | char *khelper_cmd = NULL; | |
26525618 | 749 | int verify_done = 0; |
b411b363 PR |
750 | |
751 | /* Remove all elements from the resync LRU. Since future actions | |
752 | * might set bits in the (main) bitmap, then the entries in the | |
753 | * resync LRU would be wrong. */ | |
754 | if (drbd_rs_del_all(mdev)) { | |
755 | /* In case this is not possible now, most probably because | |
756 | * there are P_RS_DATA_REPLY Packets lingering on the worker's | |
757 | * queue (or even the read operations for those packets | |
758 | * is not finished by now). Retry in 100ms. */ | |
759 | ||
20ee6390 | 760 | schedule_timeout_interruptible(HZ / 10); |
b411b363 PR |
761 | w = kmalloc(sizeof(struct drbd_work), GFP_ATOMIC); |
762 | if (w) { | |
763 | w->cb = w_resync_finished; | |
e42325a5 | 764 | drbd_queue_work(&mdev->tconn->data.work, w); |
b411b363 PR |
765 | return 1; |
766 | } | |
767 | dev_err(DEV, "Warn failed to drbd_rs_del_all() and to kmalloc(w).\n"); | |
768 | } | |
769 | ||
770 | dt = (jiffies - mdev->rs_start - mdev->rs_paused) / HZ; | |
771 | if (dt <= 0) | |
772 | dt = 1; | |
773 | db = mdev->rs_total; | |
774 | dbdt = Bit2KB(db/dt); | |
775 | mdev->rs_paused /= HZ; | |
776 | ||
777 | if (!get_ldev(mdev)) | |
778 | goto out; | |
779 | ||
af85e8e8 LE |
780 | ping_peer(mdev); |
781 | ||
87eeee41 | 782 | spin_lock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
783 | os = mdev->state; |
784 | ||
26525618 LE |
785 | verify_done = (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T); |
786 | ||
b411b363 PR |
787 | /* This protects us against multiple calls (that can happen in the presence |
788 | of application IO), and against connectivity loss just before we arrive here. */ | |
789 | if (os.conn <= C_CONNECTED) | |
790 | goto out_unlock; | |
791 | ||
792 | ns = os; | |
793 | ns.conn = C_CONNECTED; | |
794 | ||
795 | dev_info(DEV, "%s done (total %lu sec; paused %lu sec; %lu K/sec)\n", | |
26525618 | 796 | verify_done ? "Online verify " : "Resync", |
b411b363 PR |
797 | dt + mdev->rs_paused, mdev->rs_paused, dbdt); |
798 | ||
799 | n_oos = drbd_bm_total_weight(mdev); | |
800 | ||
801 | if (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) { | |
802 | if (n_oos) { | |
803 | dev_alert(DEV, "Online verify found %lu %dk block out of sync!\n", | |
804 | n_oos, Bit2KB(1)); | |
805 | khelper_cmd = "out-of-sync"; | |
806 | } | |
807 | } else { | |
808 | D_ASSERT((n_oos - mdev->rs_failed) == 0); | |
809 | ||
810 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) | |
811 | khelper_cmd = "after-resync-target"; | |
812 | ||
813 | if (mdev->csums_tfm && mdev->rs_total) { | |
814 | const unsigned long s = mdev->rs_same_csum; | |
815 | const unsigned long t = mdev->rs_total; | |
816 | const int ratio = | |
817 | (t == 0) ? 0 : | |
818 | (t < 100000) ? ((s*100)/t) : (s/(t/100)); | |
24c4830c | 819 | dev_info(DEV, "%u %% had equal checksums, eliminated: %luK; " |
b411b363 PR |
820 | "transferred %luK total %luK\n", |
821 | ratio, | |
822 | Bit2KB(mdev->rs_same_csum), | |
823 | Bit2KB(mdev->rs_total - mdev->rs_same_csum), | |
824 | Bit2KB(mdev->rs_total)); | |
825 | } | |
826 | } | |
827 | ||
828 | if (mdev->rs_failed) { | |
829 | dev_info(DEV, " %lu failed blocks\n", mdev->rs_failed); | |
830 | ||
831 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) { | |
832 | ns.disk = D_INCONSISTENT; | |
833 | ns.pdsk = D_UP_TO_DATE; | |
834 | } else { | |
835 | ns.disk = D_UP_TO_DATE; | |
836 | ns.pdsk = D_INCONSISTENT; | |
837 | } | |
838 | } else { | |
839 | ns.disk = D_UP_TO_DATE; | |
840 | ns.pdsk = D_UP_TO_DATE; | |
841 | ||
842 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) { | |
843 | if (mdev->p_uuid) { | |
844 | int i; | |
845 | for (i = UI_BITMAP ; i <= UI_HISTORY_END ; i++) | |
846 | _drbd_uuid_set(mdev, i, mdev->p_uuid[i]); | |
847 | drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_CURRENT]); | |
848 | _drbd_uuid_set(mdev, UI_CURRENT, mdev->p_uuid[UI_CURRENT]); | |
849 | } else { | |
850 | dev_err(DEV, "mdev->p_uuid is NULL! BUG\n"); | |
851 | } | |
852 | } | |
853 | ||
62b0da3a LE |
854 | if (!(os.conn == C_VERIFY_S || os.conn == C_VERIFY_T)) { |
855 | /* for verify runs, we don't update uuids here, | |
856 | * so there would be nothing to report. */ | |
857 | drbd_uuid_set_bm(mdev, 0UL); | |
858 | drbd_print_uuids(mdev, "updated UUIDs"); | |
859 | if (mdev->p_uuid) { | |
860 | /* Now the two UUID sets are equal, update what we | |
861 | * know of the peer. */ | |
862 | int i; | |
863 | for (i = UI_CURRENT ; i <= UI_HISTORY_END ; i++) | |
864 | mdev->p_uuid[i] = mdev->ldev->md.uuid[i]; | |
865 | } | |
b411b363 PR |
866 | } |
867 | } | |
868 | ||
869 | _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); | |
870 | out_unlock: | |
87eeee41 | 871 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
872 | put_ldev(mdev); |
873 | out: | |
874 | mdev->rs_total = 0; | |
875 | mdev->rs_failed = 0; | |
876 | mdev->rs_paused = 0; | |
26525618 LE |
877 | if (verify_done) |
878 | mdev->ov_start_sector = 0; | |
b411b363 | 879 | |
13d42685 LE |
880 | drbd_md_sync(mdev); |
881 | ||
b411b363 PR |
882 | if (khelper_cmd) |
883 | drbd_khelper(mdev, khelper_cmd); | |
884 | ||
885 | return 1; | |
886 | } | |
887 | ||
888 | /* helper */ | |
db830c46 | 889 | static void move_to_net_ee_or_free(struct drbd_conf *mdev, struct drbd_peer_request *peer_req) |
b411b363 | 890 | { |
db830c46 | 891 | if (drbd_ee_has_active_page(peer_req)) { |
b411b363 | 892 | /* This might happen if sendpage() has not finished */ |
db830c46 | 893 | int i = (peer_req->i.size + PAGE_SIZE -1) >> PAGE_SHIFT; |
435f0740 LE |
894 | atomic_add(i, &mdev->pp_in_use_by_net); |
895 | atomic_sub(i, &mdev->pp_in_use); | |
87eeee41 | 896 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 | 897 | list_add_tail(&peer_req->w.list, &mdev->net_ee); |
87eeee41 | 898 | spin_unlock_irq(&mdev->tconn->req_lock); |
435f0740 | 899 | wake_up(&drbd_pp_wait); |
b411b363 | 900 | } else |
db830c46 | 901 | drbd_free_ee(mdev, peer_req); |
b411b363 PR |
902 | } |
903 | ||
904 | /** | |
905 | * w_e_end_data_req() - Worker callback, to send a P_DATA_REPLY packet in response to a P_DATA_REQUEST | |
906 | * @mdev: DRBD device. | |
907 | * @w: work object. | |
908 | * @cancel: The connection will be closed anyways | |
909 | */ | |
00d56944 | 910 | int w_e_end_data_req(struct drbd_work *w, int cancel) |
b411b363 | 911 | { |
db830c46 | 912 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
00d56944 | 913 | struct drbd_conf *mdev = w->mdev; |
b411b363 PR |
914 | int ok; |
915 | ||
916 | if (unlikely(cancel)) { | |
db830c46 | 917 | drbd_free_ee(mdev, peer_req); |
b411b363 PR |
918 | dec_unacked(mdev); |
919 | return 1; | |
920 | } | |
921 | ||
db830c46 AG |
922 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
923 | ok = drbd_send_block(mdev, P_DATA_REPLY, peer_req); | |
b411b363 PR |
924 | } else { |
925 | if (__ratelimit(&drbd_ratelimit_state)) | |
926 | dev_err(DEV, "Sending NegDReply. sector=%llus.\n", | |
db830c46 | 927 | (unsigned long long)peer_req->i.sector); |
b411b363 | 928 | |
db830c46 | 929 | ok = drbd_send_ack(mdev, P_NEG_DREPLY, peer_req); |
b411b363 PR |
930 | } |
931 | ||
932 | dec_unacked(mdev); | |
933 | ||
db830c46 | 934 | move_to_net_ee_or_free(mdev, peer_req); |
b411b363 PR |
935 | |
936 | if (unlikely(!ok)) | |
937 | dev_err(DEV, "drbd_send_block() failed\n"); | |
938 | return ok; | |
939 | } | |
940 | ||
941 | /** | |
942 | * w_e_end_rsdata_req() - Worker callback to send a P_RS_DATA_REPLY packet in response to a P_RS_DATA_REQUESTRS | |
943 | * @mdev: DRBD device. | |
944 | * @w: work object. | |
945 | * @cancel: The connection will be closed anyways | |
946 | */ | |
00d56944 | 947 | int w_e_end_rsdata_req(struct drbd_work *w, int cancel) |
b411b363 | 948 | { |
db830c46 | 949 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
00d56944 | 950 | struct drbd_conf *mdev = w->mdev; |
b411b363 PR |
951 | int ok; |
952 | ||
953 | if (unlikely(cancel)) { | |
db830c46 | 954 | drbd_free_ee(mdev, peer_req); |
b411b363 PR |
955 | dec_unacked(mdev); |
956 | return 1; | |
957 | } | |
958 | ||
959 | if (get_ldev_if_state(mdev, D_FAILED)) { | |
db830c46 | 960 | drbd_rs_complete_io(mdev, peer_req->i.sector); |
b411b363 PR |
961 | put_ldev(mdev); |
962 | } | |
963 | ||
d612d309 | 964 | if (mdev->state.conn == C_AHEAD) { |
db830c46 AG |
965 | ok = drbd_send_ack(mdev, P_RS_CANCEL, peer_req); |
966 | } else if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { | |
b411b363 PR |
967 | if (likely(mdev->state.pdsk >= D_INCONSISTENT)) { |
968 | inc_rs_pending(mdev); | |
db830c46 | 969 | ok = drbd_send_block(mdev, P_RS_DATA_REPLY, peer_req); |
b411b363 PR |
970 | } else { |
971 | if (__ratelimit(&drbd_ratelimit_state)) | |
972 | dev_err(DEV, "Not sending RSDataReply, " | |
973 | "partner DISKLESS!\n"); | |
974 | ok = 1; | |
975 | } | |
976 | } else { | |
977 | if (__ratelimit(&drbd_ratelimit_state)) | |
978 | dev_err(DEV, "Sending NegRSDReply. sector %llus.\n", | |
db830c46 | 979 | (unsigned long long)peer_req->i.sector); |
b411b363 | 980 | |
db830c46 | 981 | ok = drbd_send_ack(mdev, P_NEG_RS_DREPLY, peer_req); |
b411b363 PR |
982 | |
983 | /* update resync data with failure */ | |
db830c46 | 984 | drbd_rs_failed_io(mdev, peer_req->i.sector, peer_req->i.size); |
b411b363 PR |
985 | } |
986 | ||
987 | dec_unacked(mdev); | |
988 | ||
db830c46 | 989 | move_to_net_ee_or_free(mdev, peer_req); |
b411b363 PR |
990 | |
991 | if (unlikely(!ok)) | |
992 | dev_err(DEV, "drbd_send_block() failed\n"); | |
993 | return ok; | |
994 | } | |
995 | ||
00d56944 | 996 | int w_e_end_csum_rs_req(struct drbd_work *w, int cancel) |
b411b363 | 997 | { |
db830c46 | 998 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
00d56944 | 999 | struct drbd_conf *mdev = w->mdev; |
b411b363 PR |
1000 | struct digest_info *di; |
1001 | int digest_size; | |
1002 | void *digest = NULL; | |
1003 | int ok, eq = 0; | |
1004 | ||
1005 | if (unlikely(cancel)) { | |
db830c46 | 1006 | drbd_free_ee(mdev, peer_req); |
b411b363 PR |
1007 | dec_unacked(mdev); |
1008 | return 1; | |
1009 | } | |
1010 | ||
1d53f09e | 1011 | if (get_ldev(mdev)) { |
db830c46 | 1012 | drbd_rs_complete_io(mdev, peer_req->i.sector); |
1d53f09e LE |
1013 | put_ldev(mdev); |
1014 | } | |
b411b363 | 1015 | |
db830c46 | 1016 | di = peer_req->digest; |
b411b363 | 1017 | |
db830c46 | 1018 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
1019 | /* quick hack to try to avoid a race against reconfiguration. |
1020 | * a real fix would be much more involved, | |
1021 | * introducing more locking mechanisms */ | |
1022 | if (mdev->csums_tfm) { | |
1023 | digest_size = crypto_hash_digestsize(mdev->csums_tfm); | |
1024 | D_ASSERT(digest_size == di->digest_size); | |
1025 | digest = kmalloc(digest_size, GFP_NOIO); | |
1026 | } | |
1027 | if (digest) { | |
db830c46 | 1028 | drbd_csum_ee(mdev, mdev->csums_tfm, peer_req, digest); |
b411b363 PR |
1029 | eq = !memcmp(digest, di->digest, digest_size); |
1030 | kfree(digest); | |
1031 | } | |
1032 | ||
1033 | if (eq) { | |
db830c46 | 1034 | drbd_set_in_sync(mdev, peer_req->i.sector, peer_req->i.size); |
676396d5 | 1035 | /* rs_same_csums unit is BM_BLOCK_SIZE */ |
db830c46 AG |
1036 | mdev->rs_same_csum += peer_req->i.size >> BM_BLOCK_SHIFT; |
1037 | ok = drbd_send_ack(mdev, P_RS_IS_IN_SYNC, peer_req); | |
b411b363 PR |
1038 | } else { |
1039 | inc_rs_pending(mdev); | |
db830c46 AG |
1040 | peer_req->block_id = ID_SYNCER; /* By setting block_id, digest pointer becomes invalid! */ |
1041 | peer_req->flags &= ~EE_HAS_DIGEST; /* This peer request no longer has a digest pointer */ | |
204bba99 | 1042 | kfree(di); |
db830c46 | 1043 | ok = drbd_send_block(mdev, P_RS_DATA_REPLY, peer_req); |
b411b363 PR |
1044 | } |
1045 | } else { | |
db830c46 | 1046 | ok = drbd_send_ack(mdev, P_NEG_RS_DREPLY, peer_req); |
b411b363 PR |
1047 | if (__ratelimit(&drbd_ratelimit_state)) |
1048 | dev_err(DEV, "Sending NegDReply. I guess it gets messy.\n"); | |
1049 | } | |
1050 | ||
1051 | dec_unacked(mdev); | |
db830c46 | 1052 | move_to_net_ee_or_free(mdev, peer_req); |
b411b363 PR |
1053 | |
1054 | if (unlikely(!ok)) | |
1055 | dev_err(DEV, "drbd_send_block/ack() failed\n"); | |
1056 | return ok; | |
1057 | } | |
1058 | ||
00d56944 | 1059 | int w_e_end_ov_req(struct drbd_work *w, int cancel) |
b411b363 | 1060 | { |
db830c46 | 1061 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
00d56944 | 1062 | struct drbd_conf *mdev = w->mdev; |
db830c46 AG |
1063 | sector_t sector = peer_req->i.sector; |
1064 | unsigned int size = peer_req->i.size; | |
b411b363 PR |
1065 | int digest_size; |
1066 | void *digest; | |
1067 | int ok = 1; | |
1068 | ||
1069 | if (unlikely(cancel)) | |
1070 | goto out; | |
1071 | ||
b411b363 | 1072 | digest_size = crypto_hash_digestsize(mdev->verify_tfm); |
b411b363 | 1073 | digest = kmalloc(digest_size, GFP_NOIO); |
8f21420e PR |
1074 | if (!digest) { |
1075 | ok = 0; /* terminate the connection in case the allocation failed */ | |
1076 | goto out; | |
b411b363 PR |
1077 | } |
1078 | ||
db830c46 AG |
1079 | if (likely(!(peer_req->flags & EE_WAS_ERROR))) |
1080 | drbd_csum_ee(mdev, mdev->verify_tfm, peer_req, digest); | |
8f21420e PR |
1081 | else |
1082 | memset(digest, 0, digest_size); | |
1083 | ||
53ea4331 LE |
1084 | /* Free e and pages before send. |
1085 | * In case we block on congestion, we could otherwise run into | |
1086 | * some distributed deadlock, if the other side blocks on | |
1087 | * congestion as well, because our receiver blocks in | |
1088 | * drbd_pp_alloc due to pp_in_use > max_buffers. */ | |
db830c46 AG |
1089 | drbd_free_ee(mdev, peer_req); |
1090 | peer_req = NULL; | |
8f21420e | 1091 | inc_rs_pending(mdev); |
53ea4331 LE |
1092 | ok = drbd_send_drequest_csum(mdev, sector, size, |
1093 | digest, digest_size, | |
1094 | P_OV_REPLY); | |
8f21420e PR |
1095 | if (!ok) |
1096 | dec_rs_pending(mdev); | |
1097 | kfree(digest); | |
1098 | ||
b411b363 | 1099 | out: |
db830c46 AG |
1100 | if (peer_req) |
1101 | drbd_free_ee(mdev, peer_req); | |
b411b363 | 1102 | dec_unacked(mdev); |
b411b363 PR |
1103 | return ok; |
1104 | } | |
1105 | ||
1106 | void drbd_ov_oos_found(struct drbd_conf *mdev, sector_t sector, int size) | |
1107 | { | |
1108 | if (mdev->ov_last_oos_start + mdev->ov_last_oos_size == sector) { | |
1109 | mdev->ov_last_oos_size += size>>9; | |
1110 | } else { | |
1111 | mdev->ov_last_oos_start = sector; | |
1112 | mdev->ov_last_oos_size = size>>9; | |
1113 | } | |
1114 | drbd_set_out_of_sync(mdev, sector, size); | |
b411b363 PR |
1115 | } |
1116 | ||
00d56944 | 1117 | int w_e_end_ov_reply(struct drbd_work *w, int cancel) |
b411b363 | 1118 | { |
db830c46 | 1119 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
00d56944 | 1120 | struct drbd_conf *mdev = w->mdev; |
b411b363 | 1121 | struct digest_info *di; |
b411b363 | 1122 | void *digest; |
db830c46 AG |
1123 | sector_t sector = peer_req->i.sector; |
1124 | unsigned int size = peer_req->i.size; | |
53ea4331 | 1125 | int digest_size; |
b411b363 PR |
1126 | int ok, eq = 0; |
1127 | ||
1128 | if (unlikely(cancel)) { | |
db830c46 | 1129 | drbd_free_ee(mdev, peer_req); |
b411b363 PR |
1130 | dec_unacked(mdev); |
1131 | return 1; | |
1132 | } | |
1133 | ||
1134 | /* after "cancel", because after drbd_disconnect/drbd_rs_cancel_all | |
1135 | * the resync lru has been cleaned up already */ | |
1d53f09e | 1136 | if (get_ldev(mdev)) { |
db830c46 | 1137 | drbd_rs_complete_io(mdev, peer_req->i.sector); |
1d53f09e LE |
1138 | put_ldev(mdev); |
1139 | } | |
b411b363 | 1140 | |
db830c46 | 1141 | di = peer_req->digest; |
b411b363 | 1142 | |
db830c46 | 1143 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
1144 | digest_size = crypto_hash_digestsize(mdev->verify_tfm); |
1145 | digest = kmalloc(digest_size, GFP_NOIO); | |
1146 | if (digest) { | |
db830c46 | 1147 | drbd_csum_ee(mdev, mdev->verify_tfm, peer_req, digest); |
b411b363 PR |
1148 | |
1149 | D_ASSERT(digest_size == di->digest_size); | |
1150 | eq = !memcmp(digest, di->digest, digest_size); | |
1151 | kfree(digest); | |
1152 | } | |
b411b363 PR |
1153 | } |
1154 | ||
9676c760 LE |
1155 | /* Free peer_req and pages before send. |
1156 | * In case we block on congestion, we could otherwise run into | |
1157 | * some distributed deadlock, if the other side blocks on | |
1158 | * congestion as well, because our receiver blocks in | |
1159 | * drbd_pp_alloc due to pp_in_use > max_buffers. */ | |
db830c46 | 1160 | drbd_free_ee(mdev, peer_req); |
b411b363 | 1161 | if (!eq) |
53ea4331 | 1162 | drbd_ov_oos_found(mdev, sector, size); |
b411b363 PR |
1163 | else |
1164 | ov_oos_print(mdev); | |
1165 | ||
53ea4331 | 1166 | ok = drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, |
b411b363 PR |
1167 | eq ? ID_IN_SYNC : ID_OUT_OF_SYNC); |
1168 | ||
53ea4331 | 1169 | dec_unacked(mdev); |
b411b363 | 1170 | |
ea5442af LE |
1171 | --mdev->ov_left; |
1172 | ||
1173 | /* let's advance progress step marks only for every other megabyte */ | |
1174 | if ((mdev->ov_left & 0x200) == 0x200) | |
1175 | drbd_advance_rs_marks(mdev, mdev->ov_left); | |
1176 | ||
1177 | if (mdev->ov_left == 0) { | |
b411b363 PR |
1178 | ov_oos_print(mdev); |
1179 | drbd_resync_finished(mdev); | |
1180 | } | |
1181 | ||
1182 | return ok; | |
1183 | } | |
1184 | ||
00d56944 | 1185 | int w_prev_work_done(struct drbd_work *w, int cancel) |
b411b363 PR |
1186 | { |
1187 | struct drbd_wq_barrier *b = container_of(w, struct drbd_wq_barrier, w); | |
00d56944 | 1188 | |
b411b363 PR |
1189 | complete(&b->done); |
1190 | return 1; | |
1191 | } | |
1192 | ||
00d56944 | 1193 | int w_send_barrier(struct drbd_work *w, int cancel) |
b411b363 PR |
1194 | { |
1195 | struct drbd_tl_epoch *b = container_of(w, struct drbd_tl_epoch, w); | |
00d56944 | 1196 | struct drbd_conf *mdev = w->mdev; |
e42325a5 | 1197 | struct p_barrier *p = &mdev->tconn->data.sbuf.barrier; |
b411b363 PR |
1198 | int ok = 1; |
1199 | ||
1200 | /* really avoid racing with tl_clear. w.cb may have been referenced | |
1201 | * just before it was reassigned and re-queued, so double check that. | |
1202 | * actually, this race was harmless, since we only try to send the | |
1203 | * barrier packet here, and otherwise do nothing with the object. | |
1204 | * but compare with the head of w_clear_epoch */ | |
87eeee41 | 1205 | spin_lock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
1206 | if (w->cb != w_send_barrier || mdev->state.conn < C_CONNECTED) |
1207 | cancel = 1; | |
87eeee41 | 1208 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
1209 | if (cancel) |
1210 | return 1; | |
1211 | ||
61120870 | 1212 | if (!drbd_get_data_sock(mdev->tconn)) |
b411b363 PR |
1213 | return 0; |
1214 | p->barrier = b->br_number; | |
1215 | /* inc_ap_pending was done where this was queued. | |
1216 | * dec_ap_pending will be done in got_BarrierAck | |
1217 | * or (on connection loss) in w_clear_epoch. */ | |
e42325a5 | 1218 | ok = _drbd_send_cmd(mdev, mdev->tconn->data.socket, P_BARRIER, |
c012949a | 1219 | &p->head, sizeof(*p), 0); |
61120870 | 1220 | drbd_put_data_sock(mdev->tconn); |
b411b363 PR |
1221 | |
1222 | return ok; | |
1223 | } | |
1224 | ||
00d56944 | 1225 | int w_send_write_hint(struct drbd_work *w, int cancel) |
b411b363 | 1226 | { |
00d56944 | 1227 | struct drbd_conf *mdev = w->mdev; |
b411b363 PR |
1228 | if (cancel) |
1229 | return 1; | |
1230 | return drbd_send_short_cmd(mdev, P_UNPLUG_REMOTE); | |
1231 | } | |
1232 | ||
00d56944 | 1233 | int w_send_oos(struct drbd_work *w, int cancel) |
73a01a18 PR |
1234 | { |
1235 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
00d56944 | 1236 | struct drbd_conf *mdev = w->mdev; |
73a01a18 PR |
1237 | int ok; |
1238 | ||
1239 | if (unlikely(cancel)) { | |
8554df1c | 1240 | req_mod(req, SEND_CANCELED); |
73a01a18 PR |
1241 | return 1; |
1242 | } | |
1243 | ||
1244 | ok = drbd_send_oos(mdev, req); | |
8554df1c | 1245 | req_mod(req, OOS_HANDED_TO_NETWORK); |
73a01a18 PR |
1246 | |
1247 | return ok; | |
1248 | } | |
1249 | ||
b411b363 PR |
1250 | /** |
1251 | * w_send_dblock() - Worker callback to send a P_DATA packet in order to mirror a write request | |
1252 | * @mdev: DRBD device. | |
1253 | * @w: work object. | |
1254 | * @cancel: The connection will be closed anyways | |
1255 | */ | |
00d56944 | 1256 | int w_send_dblock(struct drbd_work *w, int cancel) |
b411b363 PR |
1257 | { |
1258 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
00d56944 | 1259 | struct drbd_conf *mdev = w->mdev; |
b411b363 PR |
1260 | int ok; |
1261 | ||
1262 | if (unlikely(cancel)) { | |
8554df1c | 1263 | req_mod(req, SEND_CANCELED); |
b411b363 PR |
1264 | return 1; |
1265 | } | |
1266 | ||
1267 | ok = drbd_send_dblock(mdev, req); | |
8554df1c | 1268 | req_mod(req, ok ? HANDED_OVER_TO_NETWORK : SEND_FAILED); |
b411b363 PR |
1269 | |
1270 | return ok; | |
1271 | } | |
1272 | ||
1273 | /** | |
1274 | * w_send_read_req() - Worker callback to send a read request (P_DATA_REQUEST) packet | |
1275 | * @mdev: DRBD device. | |
1276 | * @w: work object. | |
1277 | * @cancel: The connection will be closed anyways | |
1278 | */ | |
00d56944 | 1279 | int w_send_read_req(struct drbd_work *w, int cancel) |
b411b363 PR |
1280 | { |
1281 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
00d56944 | 1282 | struct drbd_conf *mdev = w->mdev; |
b411b363 PR |
1283 | int ok; |
1284 | ||
1285 | if (unlikely(cancel)) { | |
8554df1c | 1286 | req_mod(req, SEND_CANCELED); |
b411b363 PR |
1287 | return 1; |
1288 | } | |
1289 | ||
ace652ac | 1290 | ok = drbd_send_drequest(mdev, P_DATA_REQUEST, req->i.sector, req->i.size, |
b411b363 PR |
1291 | (unsigned long)req); |
1292 | ||
1293 | if (!ok) { | |
1294 | /* ?? we set C_TIMEOUT or C_BROKEN_PIPE in drbd_send(); | |
1295 | * so this is probably redundant */ | |
1296 | if (mdev->state.conn >= C_CONNECTED) | |
1297 | drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE)); | |
1298 | } | |
8554df1c | 1299 | req_mod(req, ok ? HANDED_OVER_TO_NETWORK : SEND_FAILED); |
b411b363 PR |
1300 | |
1301 | return ok; | |
1302 | } | |
1303 | ||
00d56944 | 1304 | int w_restart_disk_io(struct drbd_work *w, int cancel) |
265be2d0 PR |
1305 | { |
1306 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
00d56944 | 1307 | struct drbd_conf *mdev = w->mdev; |
265be2d0 | 1308 | |
0778286a | 1309 | if (bio_data_dir(req->master_bio) == WRITE && req->rq_state & RQ_IN_ACT_LOG) |
ace652ac | 1310 | drbd_al_begin_io(mdev, req->i.sector); |
265be2d0 PR |
1311 | /* Calling drbd_al_begin_io() out of the worker might deadlocks |
1312 | theoretically. Practically it can not deadlock, since this is | |
1313 | only used when unfreezing IOs. All the extents of the requests | |
1314 | that made it into the TL are already active */ | |
1315 | ||
1316 | drbd_req_make_private_bio(req, req->master_bio); | |
1317 | req->private_bio->bi_bdev = mdev->ldev->backing_bdev; | |
1318 | generic_make_request(req->private_bio); | |
1319 | ||
1320 | return 1; | |
1321 | } | |
1322 | ||
b411b363 PR |
1323 | static int _drbd_may_sync_now(struct drbd_conf *mdev) |
1324 | { | |
1325 | struct drbd_conf *odev = mdev; | |
1326 | ||
1327 | while (1) { | |
1328 | if (odev->sync_conf.after == -1) | |
1329 | return 1; | |
1330 | odev = minor_to_mdev(odev->sync_conf.after); | |
841ce241 AG |
1331 | if (!expect(odev)) |
1332 | return 1; | |
b411b363 PR |
1333 | if ((odev->state.conn >= C_SYNC_SOURCE && |
1334 | odev->state.conn <= C_PAUSED_SYNC_T) || | |
1335 | odev->state.aftr_isp || odev->state.peer_isp || | |
1336 | odev->state.user_isp) | |
1337 | return 0; | |
1338 | } | |
1339 | } | |
1340 | ||
1341 | /** | |
1342 | * _drbd_pause_after() - Pause resync on all devices that may not resync now | |
1343 | * @mdev: DRBD device. | |
1344 | * | |
1345 | * Called from process context only (admin command and after_state_ch). | |
1346 | */ | |
1347 | static int _drbd_pause_after(struct drbd_conf *mdev) | |
1348 | { | |
1349 | struct drbd_conf *odev; | |
1350 | int i, rv = 0; | |
1351 | ||
1352 | for (i = 0; i < minor_count; i++) { | |
1353 | odev = minor_to_mdev(i); | |
1354 | if (!odev) | |
1355 | continue; | |
1356 | if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS) | |
1357 | continue; | |
1358 | if (!_drbd_may_sync_now(odev)) | |
1359 | rv |= (__drbd_set_state(_NS(odev, aftr_isp, 1), CS_HARD, NULL) | |
1360 | != SS_NOTHING_TO_DO); | |
1361 | } | |
1362 | ||
1363 | return rv; | |
1364 | } | |
1365 | ||
1366 | /** | |
1367 | * _drbd_resume_next() - Resume resync on all devices that may resync now | |
1368 | * @mdev: DRBD device. | |
1369 | * | |
1370 | * Called from process context only (admin command and worker). | |
1371 | */ | |
1372 | static int _drbd_resume_next(struct drbd_conf *mdev) | |
1373 | { | |
1374 | struct drbd_conf *odev; | |
1375 | int i, rv = 0; | |
1376 | ||
1377 | for (i = 0; i < minor_count; i++) { | |
1378 | odev = minor_to_mdev(i); | |
1379 | if (!odev) | |
1380 | continue; | |
1381 | if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS) | |
1382 | continue; | |
1383 | if (odev->state.aftr_isp) { | |
1384 | if (_drbd_may_sync_now(odev)) | |
1385 | rv |= (__drbd_set_state(_NS(odev, aftr_isp, 0), | |
1386 | CS_HARD, NULL) | |
1387 | != SS_NOTHING_TO_DO) ; | |
1388 | } | |
1389 | } | |
1390 | return rv; | |
1391 | } | |
1392 | ||
1393 | void resume_next_sg(struct drbd_conf *mdev) | |
1394 | { | |
1395 | write_lock_irq(&global_state_lock); | |
1396 | _drbd_resume_next(mdev); | |
1397 | write_unlock_irq(&global_state_lock); | |
1398 | } | |
1399 | ||
1400 | void suspend_other_sg(struct drbd_conf *mdev) | |
1401 | { | |
1402 | write_lock_irq(&global_state_lock); | |
1403 | _drbd_pause_after(mdev); | |
1404 | write_unlock_irq(&global_state_lock); | |
1405 | } | |
1406 | ||
1407 | static int sync_after_error(struct drbd_conf *mdev, int o_minor) | |
1408 | { | |
1409 | struct drbd_conf *odev; | |
1410 | ||
1411 | if (o_minor == -1) | |
1412 | return NO_ERROR; | |
1413 | if (o_minor < -1 || minor_to_mdev(o_minor) == NULL) | |
1414 | return ERR_SYNC_AFTER; | |
1415 | ||
1416 | /* check for loops */ | |
1417 | odev = minor_to_mdev(o_minor); | |
1418 | while (1) { | |
1419 | if (odev == mdev) | |
1420 | return ERR_SYNC_AFTER_CYCLE; | |
1421 | ||
1422 | /* dependency chain ends here, no cycles. */ | |
1423 | if (odev->sync_conf.after == -1) | |
1424 | return NO_ERROR; | |
1425 | ||
1426 | /* follow the dependency chain */ | |
1427 | odev = minor_to_mdev(odev->sync_conf.after); | |
1428 | } | |
1429 | } | |
1430 | ||
1431 | int drbd_alter_sa(struct drbd_conf *mdev, int na) | |
1432 | { | |
1433 | int changes; | |
1434 | int retcode; | |
1435 | ||
1436 | write_lock_irq(&global_state_lock); | |
1437 | retcode = sync_after_error(mdev, na); | |
1438 | if (retcode == NO_ERROR) { | |
1439 | mdev->sync_conf.after = na; | |
1440 | do { | |
1441 | changes = _drbd_pause_after(mdev); | |
1442 | changes |= _drbd_resume_next(mdev); | |
1443 | } while (changes); | |
1444 | } | |
1445 | write_unlock_irq(&global_state_lock); | |
1446 | return retcode; | |
1447 | } | |
1448 | ||
9bd28d3c LE |
1449 | void drbd_rs_controller_reset(struct drbd_conf *mdev) |
1450 | { | |
1451 | atomic_set(&mdev->rs_sect_in, 0); | |
1452 | atomic_set(&mdev->rs_sect_ev, 0); | |
1453 | mdev->rs_in_flight = 0; | |
1454 | mdev->rs_planed = 0; | |
1455 | spin_lock(&mdev->peer_seq_lock); | |
1456 | fifo_set(&mdev->rs_plan_s, 0); | |
1457 | spin_unlock(&mdev->peer_seq_lock); | |
1458 | } | |
1459 | ||
1f04af33 PR |
1460 | void start_resync_timer_fn(unsigned long data) |
1461 | { | |
1462 | struct drbd_conf *mdev = (struct drbd_conf *) data; | |
1463 | ||
1464 | drbd_queue_work(&mdev->tconn->data.work, &mdev->start_resync_work); | |
1465 | } | |
1466 | ||
00d56944 | 1467 | int w_start_resync(struct drbd_work *w, int cancel) |
1f04af33 | 1468 | { |
00d56944 PR |
1469 | struct drbd_conf *mdev = w->mdev; |
1470 | ||
1f04af33 PR |
1471 | if (atomic_read(&mdev->unacked_cnt) || atomic_read(&mdev->rs_pending_cnt)) { |
1472 | dev_warn(DEV, "w_start_resync later...\n"); | |
1473 | mdev->start_resync_timer.expires = jiffies + HZ/10; | |
1474 | add_timer(&mdev->start_resync_timer); | |
1475 | return 1; | |
1476 | } | |
1477 | ||
1478 | drbd_start_resync(mdev, C_SYNC_SOURCE); | |
1479 | clear_bit(AHEAD_TO_SYNC_SOURCE, &mdev->current_epoch->flags); | |
1480 | return 1; | |
1481 | } | |
1482 | ||
b411b363 PR |
1483 | /** |
1484 | * drbd_start_resync() - Start the resync process | |
1485 | * @mdev: DRBD device. | |
1486 | * @side: Either C_SYNC_SOURCE or C_SYNC_TARGET | |
1487 | * | |
1488 | * This function might bring you directly into one of the | |
1489 | * C_PAUSED_SYNC_* states. | |
1490 | */ | |
1491 | void drbd_start_resync(struct drbd_conf *mdev, enum drbd_conns side) | |
1492 | { | |
1493 | union drbd_state ns; | |
1494 | int r; | |
1495 | ||
c4752ef1 | 1496 | if (mdev->state.conn >= C_SYNC_SOURCE && mdev->state.conn < C_AHEAD) { |
b411b363 PR |
1497 | dev_err(DEV, "Resync already running!\n"); |
1498 | return; | |
1499 | } | |
1500 | ||
59817f4f PR |
1501 | if (mdev->state.conn < C_AHEAD) { |
1502 | /* In case a previous resync run was aborted by an IO error/detach on the peer. */ | |
1503 | drbd_rs_cancel_all(mdev); | |
1504 | /* This should be done when we abort the resync. We definitely do not | |
1505 | want to have this for connections going back and forth between | |
1506 | Ahead/Behind and SyncSource/SyncTarget */ | |
1507 | } | |
b411b363 | 1508 | |
e64a3294 PR |
1509 | if (!test_bit(B_RS_H_DONE, &mdev->flags)) { |
1510 | if (side == C_SYNC_TARGET) { | |
1511 | /* Since application IO was locked out during C_WF_BITMAP_T and | |
1512 | C_WF_SYNC_UUID we are still unmodified. Before going to C_SYNC_TARGET | |
1513 | we check that we might make the data inconsistent. */ | |
1514 | r = drbd_khelper(mdev, "before-resync-target"); | |
1515 | r = (r >> 8) & 0xff; | |
1516 | if (r > 0) { | |
1517 | dev_info(DEV, "before-resync-target handler returned %d, " | |
09b9e797 PR |
1518 | "dropping connection.\n", r); |
1519 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
1520 | return; | |
1521 | } | |
e64a3294 PR |
1522 | } else /* C_SYNC_SOURCE */ { |
1523 | r = drbd_khelper(mdev, "before-resync-source"); | |
1524 | r = (r >> 8) & 0xff; | |
1525 | if (r > 0) { | |
1526 | if (r == 3) { | |
1527 | dev_info(DEV, "before-resync-source handler returned %d, " | |
1528 | "ignoring. Old userland tools?", r); | |
1529 | } else { | |
1530 | dev_info(DEV, "before-resync-source handler returned %d, " | |
1531 | "dropping connection.\n", r); | |
1532 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
1533 | return; | |
1534 | } | |
1535 | } | |
09b9e797 | 1536 | } |
b411b363 PR |
1537 | } |
1538 | ||
e64a3294 | 1539 | if (current == mdev->tconn->worker.task) { |
dad20554 | 1540 | /* The worker should not sleep waiting for state_mutex, |
e64a3294 | 1541 | that can take long */ |
8410da8f | 1542 | if (!mutex_trylock(mdev->state_mutex)) { |
e64a3294 PR |
1543 | set_bit(B_RS_H_DONE, &mdev->flags); |
1544 | mdev->start_resync_timer.expires = jiffies + HZ/5; | |
1545 | add_timer(&mdev->start_resync_timer); | |
1546 | return; | |
1547 | } | |
1548 | } else { | |
8410da8f | 1549 | mutex_lock(mdev->state_mutex); |
e64a3294 PR |
1550 | } |
1551 | clear_bit(B_RS_H_DONE, &mdev->flags); | |
b411b363 PR |
1552 | |
1553 | if (!get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
8410da8f | 1554 | mutex_unlock(mdev->state_mutex); |
b411b363 PR |
1555 | return; |
1556 | } | |
1557 | ||
b411b363 PR |
1558 | write_lock_irq(&global_state_lock); |
1559 | ns = mdev->state; | |
1560 | ||
1561 | ns.aftr_isp = !_drbd_may_sync_now(mdev); | |
1562 | ||
1563 | ns.conn = side; | |
1564 | ||
1565 | if (side == C_SYNC_TARGET) | |
1566 | ns.disk = D_INCONSISTENT; | |
1567 | else /* side == C_SYNC_SOURCE */ | |
1568 | ns.pdsk = D_INCONSISTENT; | |
1569 | ||
1570 | r = __drbd_set_state(mdev, ns, CS_VERBOSE, NULL); | |
1571 | ns = mdev->state; | |
1572 | ||
1573 | if (ns.conn < C_CONNECTED) | |
1574 | r = SS_UNKNOWN_ERROR; | |
1575 | ||
1576 | if (r == SS_SUCCESS) { | |
1d7734a0 LE |
1577 | unsigned long tw = drbd_bm_total_weight(mdev); |
1578 | unsigned long now = jiffies; | |
1579 | int i; | |
1580 | ||
b411b363 PR |
1581 | mdev->rs_failed = 0; |
1582 | mdev->rs_paused = 0; | |
b411b363 | 1583 | mdev->rs_same_csum = 0; |
0f0601f4 LE |
1584 | mdev->rs_last_events = 0; |
1585 | mdev->rs_last_sect_ev = 0; | |
1d7734a0 LE |
1586 | mdev->rs_total = tw; |
1587 | mdev->rs_start = now; | |
1588 | for (i = 0; i < DRBD_SYNC_MARKS; i++) { | |
1589 | mdev->rs_mark_left[i] = tw; | |
1590 | mdev->rs_mark_time[i] = now; | |
1591 | } | |
b411b363 PR |
1592 | _drbd_pause_after(mdev); |
1593 | } | |
1594 | write_unlock_irq(&global_state_lock); | |
5a22db89 | 1595 | |
b411b363 PR |
1596 | if (r == SS_SUCCESS) { |
1597 | dev_info(DEV, "Began resync as %s (will sync %lu KB [%lu bits set]).\n", | |
1598 | drbd_conn_str(ns.conn), | |
1599 | (unsigned long) mdev->rs_total << (BM_BLOCK_SHIFT-10), | |
1600 | (unsigned long) mdev->rs_total); | |
6c922ed5 LE |
1601 | if (side == C_SYNC_TARGET) |
1602 | mdev->bm_resync_fo = 0; | |
1603 | ||
1604 | /* Since protocol 96, we must serialize drbd_gen_and_send_sync_uuid | |
1605 | * with w_send_oos, or the sync target will get confused as to | |
1606 | * how much bits to resync. We cannot do that always, because for an | |
1607 | * empty resync and protocol < 95, we need to do it here, as we call | |
1608 | * drbd_resync_finished from here in that case. | |
1609 | * We drbd_gen_and_send_sync_uuid here for protocol < 96, | |
1610 | * and from after_state_ch otherwise. */ | |
31890f4a | 1611 | if (side == C_SYNC_SOURCE && mdev->tconn->agreed_pro_version < 96) |
6c922ed5 | 1612 | drbd_gen_and_send_sync_uuid(mdev); |
b411b363 | 1613 | |
31890f4a | 1614 | if (mdev->tconn->agreed_pro_version < 95 && mdev->rs_total == 0) { |
af85e8e8 LE |
1615 | /* This still has a race (about when exactly the peers |
1616 | * detect connection loss) that can lead to a full sync | |
1617 | * on next handshake. In 8.3.9 we fixed this with explicit | |
1618 | * resync-finished notifications, but the fix | |
1619 | * introduces a protocol change. Sleeping for some | |
1620 | * time longer than the ping interval + timeout on the | |
1621 | * SyncSource, to give the SyncTarget the chance to | |
1622 | * detect connection loss, then waiting for a ping | |
1623 | * response (implicit in drbd_resync_finished) reduces | |
1624 | * the race considerably, but does not solve it. */ | |
1625 | if (side == C_SYNC_SOURCE) | |
1626 | schedule_timeout_interruptible( | |
89e58e75 PR |
1627 | mdev->tconn->net_conf->ping_int * HZ + |
1628 | mdev->tconn->net_conf->ping_timeo*HZ/9); | |
b411b363 | 1629 | drbd_resync_finished(mdev); |
b411b363 PR |
1630 | } |
1631 | ||
9bd28d3c | 1632 | drbd_rs_controller_reset(mdev); |
b411b363 PR |
1633 | /* ns.conn may already be != mdev->state.conn, |
1634 | * we may have been paused in between, or become paused until | |
1635 | * the timer triggers. | |
1636 | * No matter, that is handled in resync_timer_fn() */ | |
1637 | if (ns.conn == C_SYNC_TARGET) | |
1638 | mod_timer(&mdev->resync_timer, jiffies); | |
1639 | ||
1640 | drbd_md_sync(mdev); | |
1641 | } | |
5a22db89 | 1642 | put_ldev(mdev); |
8410da8f | 1643 | mutex_unlock(mdev->state_mutex); |
b411b363 PR |
1644 | } |
1645 | ||
19393e10 PR |
1646 | static int _worker_dying(int vnr, void *p, void *data) |
1647 | { | |
1648 | struct drbd_conf *mdev = (struct drbd_conf *)p; | |
1649 | ||
1650 | D_ASSERT(mdev->state.disk == D_DISKLESS && mdev->state.conn == C_STANDALONE); | |
1651 | /* _drbd_set_state only uses stop_nowait. | |
1652 | * wait here for the exiting receiver. */ | |
1653 | drbd_thread_stop(&mdev->tconn->receiver); | |
1654 | drbd_mdev_cleanup(mdev); | |
1655 | ||
1656 | clear_bit(DEVICE_DYING, &mdev->flags); | |
1657 | clear_bit(CONFIG_PENDING, &mdev->flags); | |
1658 | wake_up(&mdev->state_wait); | |
1659 | ||
1660 | return 0; | |
1661 | } | |
1662 | ||
b411b363 PR |
1663 | int drbd_worker(struct drbd_thread *thi) |
1664 | { | |
392c8801 | 1665 | struct drbd_tconn *tconn = thi->tconn; |
b411b363 PR |
1666 | struct drbd_work *w = NULL; |
1667 | LIST_HEAD(work_list); | |
19393e10 | 1668 | int intr = 0; |
b411b363 | 1669 | |
e77a0a5c | 1670 | while (get_t_state(thi) == RUNNING) { |
80822284 | 1671 | drbd_thread_current_set_cpu(thi); |
b411b363 | 1672 | |
19393e10 PR |
1673 | if (down_trylock(&tconn->data.work.s)) { |
1674 | mutex_lock(&tconn->data.mutex); | |
1675 | if (tconn->data.socket && !tconn->net_conf->no_cork) | |
1676 | drbd_tcp_uncork(tconn->data.socket); | |
1677 | mutex_unlock(&tconn->data.mutex); | |
b411b363 | 1678 | |
19393e10 | 1679 | intr = down_interruptible(&tconn->data.work.s); |
b411b363 | 1680 | |
19393e10 PR |
1681 | mutex_lock(&tconn->data.mutex); |
1682 | if (tconn->data.socket && !tconn->net_conf->no_cork) | |
1683 | drbd_tcp_cork(tconn->data.socket); | |
1684 | mutex_unlock(&tconn->data.mutex); | |
b411b363 PR |
1685 | } |
1686 | ||
1687 | if (intr) { | |
b411b363 | 1688 | flush_signals(current); |
19393e10 PR |
1689 | if (get_t_state(thi) == RUNNING) { |
1690 | conn_warn(tconn, "Worker got an unexpected signal\n"); | |
b411b363 | 1691 | continue; |
19393e10 | 1692 | } |
b411b363 PR |
1693 | break; |
1694 | } | |
1695 | ||
e77a0a5c | 1696 | if (get_t_state(thi) != RUNNING) |
b411b363 PR |
1697 | break; |
1698 | /* With this break, we have done a down() but not consumed | |
1699 | the entry from the list. The cleanup code takes care of | |
1700 | this... */ | |
1701 | ||
1702 | w = NULL; | |
19393e10 PR |
1703 | spin_lock_irq(&tconn->data.work.q_lock); |
1704 | if (list_empty(&tconn->data.work.q)) { | |
b411b363 PR |
1705 | /* something terribly wrong in our logic. |
1706 | * we were able to down() the semaphore, | |
1707 | * but the list is empty... doh. | |
1708 | * | |
1709 | * what is the best thing to do now? | |
1710 | * try again from scratch, restarting the receiver, | |
1711 | * asender, whatnot? could break even more ugly, | |
1712 | * e.g. when we are primary, but no good local data. | |
1713 | * | |
1714 | * I'll try to get away just starting over this loop. | |
1715 | */ | |
19393e10 PR |
1716 | conn_warn(tconn, "Work list unexpectedly empty\n"); |
1717 | spin_unlock_irq(&tconn->data.work.q_lock); | |
b411b363 PR |
1718 | continue; |
1719 | } | |
19393e10 | 1720 | w = list_entry(tconn->data.work.q.next, struct drbd_work, list); |
b411b363 | 1721 | list_del_init(&w->list); |
19393e10 | 1722 | spin_unlock_irq(&tconn->data.work.q_lock); |
b411b363 | 1723 | |
bbeb641c | 1724 | if (!w->cb(w, tconn->cstate < C_WF_REPORT_PARAMS)) { |
b411b363 | 1725 | /* dev_warn(DEV, "worker: a callback failed! \n"); */ |
bbeb641c PR |
1726 | if (tconn->cstate >= C_WF_REPORT_PARAMS) |
1727 | conn_request_state(tconn, NS(conn, C_NETWORK_FAILURE), CS_HARD); | |
b411b363 PR |
1728 | } |
1729 | } | |
b411b363 | 1730 | |
19393e10 PR |
1731 | spin_lock_irq(&tconn->data.work.q_lock); |
1732 | while (!list_empty(&tconn->data.work.q)) { | |
1733 | list_splice_init(&tconn->data.work.q, &work_list); | |
1734 | spin_unlock_irq(&tconn->data.work.q_lock); | |
b411b363 PR |
1735 | |
1736 | while (!list_empty(&work_list)) { | |
1737 | w = list_entry(work_list.next, struct drbd_work, list); | |
1738 | list_del_init(&w->list); | |
00d56944 | 1739 | w->cb(w, 1); |
b411b363 PR |
1740 | } |
1741 | ||
19393e10 | 1742 | spin_lock_irq(&tconn->data.work.q_lock); |
b411b363 | 1743 | } |
19393e10 | 1744 | sema_init(&tconn->data.work.s, 0); |
b411b363 PR |
1745 | /* DANGEROUS race: if someone did queue his work within the spinlock, |
1746 | * but up() ed outside the spinlock, we could get an up() on the | |
1747 | * semaphore without corresponding list entry. | |
1748 | * So don't do that. | |
1749 | */ | |
19393e10 | 1750 | spin_unlock_irq(&tconn->data.work.q_lock); |
b411b363 | 1751 | |
19393e10 | 1752 | idr_for_each(&tconn->volumes, _worker_dying, NULL); |
b411b363 PR |
1753 | |
1754 | return 0; | |
1755 | } |