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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 | |
b411b363 | 41 | static int w_make_ov_request(struct drbd_conf *mdev, struct drbd_work *w, int cancel); |
9d77a5fe PR |
42 | static int w_make_resync_request(struct drbd_conf *mdev, |
43 | struct drbd_work *w, int cancel); | |
b411b363 PR |
44 | |
45 | ||
46 | ||
c5a91619 AG |
47 | /* endio handlers: |
48 | * drbd_md_io_complete (defined here) | |
49 | * drbd_endio_pri (defined here) | |
50 | * drbd_endio_sec (defined here) | |
51 | * bm_async_io_complete (defined in drbd_bitmap.c) | |
52 | * | |
b411b363 PR |
53 | * For all these callbacks, note the following: |
54 | * The callbacks will be called in irq context by the IDE drivers, | |
55 | * and in Softirqs/Tasklets/BH context by the SCSI drivers. | |
56 | * Try to get the locking right :) | |
57 | * | |
58 | */ | |
59 | ||
60 | ||
61 | /* About the global_state_lock | |
62 | Each state transition on an device holds a read lock. In case we have | |
63 | to evaluate the sync after dependencies, we grab a write lock, because | |
64 | we need stable states on all devices for that. */ | |
65 | rwlock_t global_state_lock; | |
66 | ||
67 | /* used for synchronous meta data and bitmap IO | |
68 | * submitted by drbd_md_sync_page_io() | |
69 | */ | |
70 | void drbd_md_io_complete(struct bio *bio, int error) | |
71 | { | |
72 | struct drbd_md_io *md_io; | |
73 | ||
74 | md_io = (struct drbd_md_io *)bio->bi_private; | |
75 | md_io->error = error; | |
76 | ||
b411b363 PR |
77 | complete(&md_io->event); |
78 | } | |
79 | ||
80 | /* reads on behalf of the partner, | |
81 | * "submitted" by the receiver | |
82 | */ | |
45bb912b | 83 | void drbd_endio_read_sec_final(struct drbd_epoch_entry *e) __releases(local) |
b411b363 PR |
84 | { |
85 | unsigned long flags = 0; | |
45bb912b | 86 | struct drbd_conf *mdev = e->mdev; |
b411b363 PR |
87 | |
88 | D_ASSERT(e->block_id != ID_VACANT); | |
89 | ||
b411b363 PR |
90 | spin_lock_irqsave(&mdev->req_lock, flags); |
91 | mdev->read_cnt += e->size >> 9; | |
92 | list_del(&e->w.list); | |
93 | if (list_empty(&mdev->read_ee)) | |
94 | wake_up(&mdev->ee_wait); | |
45bb912b | 95 | if (test_bit(__EE_WAS_ERROR, &e->flags)) |
81e84650 | 96 | __drbd_chk_io_error(mdev, false); |
b411b363 PR |
97 | spin_unlock_irqrestore(&mdev->req_lock, flags); |
98 | ||
b411b363 PR |
99 | drbd_queue_work(&mdev->data.work, &e->w); |
100 | put_ldev(mdev); | |
b411b363 PR |
101 | } |
102 | ||
103 | /* writes on behalf of the partner, or resync writes, | |
45bb912b LE |
104 | * "submitted" by the receiver, final stage. */ |
105 | static void drbd_endio_write_sec_final(struct drbd_epoch_entry *e) __releases(local) | |
b411b363 PR |
106 | { |
107 | unsigned long flags = 0; | |
45bb912b | 108 | struct drbd_conf *mdev = e->mdev; |
b411b363 PR |
109 | sector_t e_sector; |
110 | int do_wake; | |
111 | int is_syncer_req; | |
112 | int do_al_complete_io; | |
b411b363 | 113 | |
b411b363 PR |
114 | D_ASSERT(e->block_id != ID_VACANT); |
115 | ||
b411b363 PR |
116 | /* after we moved e to done_ee, |
117 | * we may no longer access it, | |
118 | * it may be freed/reused already! | |
119 | * (as soon as we release the req_lock) */ | |
120 | e_sector = e->sector; | |
121 | do_al_complete_io = e->flags & EE_CALL_AL_COMPLETE_IO; | |
45bb912b | 122 | is_syncer_req = is_syncer_block_id(e->block_id); |
b411b363 | 123 | |
45bb912b LE |
124 | spin_lock_irqsave(&mdev->req_lock, flags); |
125 | mdev->writ_cnt += e->size >> 9; | |
b411b363 PR |
126 | list_del(&e->w.list); /* has been on active_ee or sync_ee */ |
127 | list_add_tail(&e->w.list, &mdev->done_ee); | |
128 | ||
24c4830c | 129 | /* No hlist_del_init(&e->collision) here, we did not send the Ack yet, |
b411b363 PR |
130 | * neither did we wake possibly waiting conflicting requests. |
131 | * done from "drbd_process_done_ee" within the appropriate w.cb | |
132 | * (e_end_block/e_end_resync_block) or from _drbd_clear_done_ee */ | |
133 | ||
134 | do_wake = is_syncer_req | |
135 | ? list_empty(&mdev->sync_ee) | |
136 | : list_empty(&mdev->active_ee); | |
137 | ||
45bb912b | 138 | if (test_bit(__EE_WAS_ERROR, &e->flags)) |
81e84650 | 139 | __drbd_chk_io_error(mdev, false); |
b411b363 PR |
140 | spin_unlock_irqrestore(&mdev->req_lock, flags); |
141 | ||
142 | if (is_syncer_req) | |
143 | drbd_rs_complete_io(mdev, e_sector); | |
144 | ||
145 | if (do_wake) | |
146 | wake_up(&mdev->ee_wait); | |
147 | ||
148 | if (do_al_complete_io) | |
149 | drbd_al_complete_io(mdev, e_sector); | |
150 | ||
151 | wake_asender(mdev); | |
152 | put_ldev(mdev); | |
45bb912b | 153 | } |
b411b363 | 154 | |
45bb912b LE |
155 | /* writes on behalf of the partner, or resync writes, |
156 | * "submitted" by the receiver. | |
157 | */ | |
158 | void drbd_endio_sec(struct bio *bio, int error) | |
159 | { | |
160 | struct drbd_epoch_entry *e = bio->bi_private; | |
161 | struct drbd_conf *mdev = e->mdev; | |
162 | int uptodate = bio_flagged(bio, BIO_UPTODATE); | |
163 | int is_write = bio_data_dir(bio) == WRITE; | |
164 | ||
07194272 | 165 | if (error && __ratelimit(&drbd_ratelimit_state)) |
45bb912b LE |
166 | dev_warn(DEV, "%s: error=%d s=%llus\n", |
167 | is_write ? "write" : "read", error, | |
168 | (unsigned long long)e->sector); | |
169 | if (!error && !uptodate) { | |
07194272 LE |
170 | if (__ratelimit(&drbd_ratelimit_state)) |
171 | dev_warn(DEV, "%s: setting error to -EIO s=%llus\n", | |
172 | is_write ? "write" : "read", | |
173 | (unsigned long long)e->sector); | |
45bb912b LE |
174 | /* strange behavior of some lower level drivers... |
175 | * fail the request by clearing the uptodate flag, | |
176 | * but do not return any error?! */ | |
177 | error = -EIO; | |
178 | } | |
179 | ||
180 | if (error) | |
181 | set_bit(__EE_WAS_ERROR, &e->flags); | |
182 | ||
183 | bio_put(bio); /* no need for the bio anymore */ | |
184 | if (atomic_dec_and_test(&e->pending_bios)) { | |
185 | if (is_write) | |
186 | drbd_endio_write_sec_final(e); | |
187 | else | |
188 | drbd_endio_read_sec_final(e); | |
189 | } | |
b411b363 PR |
190 | } |
191 | ||
192 | /* read, readA or write requests on R_PRIMARY coming from drbd_make_request | |
193 | */ | |
194 | void drbd_endio_pri(struct bio *bio, int error) | |
195 | { | |
a115413d | 196 | unsigned long flags; |
b411b363 PR |
197 | struct drbd_request *req = bio->bi_private; |
198 | struct drbd_conf *mdev = req->mdev; | |
a115413d | 199 | struct bio_and_error m; |
b411b363 PR |
200 | enum drbd_req_event what; |
201 | int uptodate = bio_flagged(bio, BIO_UPTODATE); | |
202 | ||
b411b363 PR |
203 | if (!error && !uptodate) { |
204 | dev_warn(DEV, "p %s: setting error to -EIO\n", | |
205 | bio_data_dir(bio) == WRITE ? "write" : "read"); | |
206 | /* strange behavior of some lower level drivers... | |
207 | * fail the request by clearing the uptodate flag, | |
208 | * but do not return any error?! */ | |
209 | error = -EIO; | |
210 | } | |
211 | ||
b411b363 PR |
212 | /* to avoid recursion in __req_mod */ |
213 | if (unlikely(error)) { | |
214 | what = (bio_data_dir(bio) == WRITE) | |
215 | ? write_completed_with_error | |
5c3c7e64 | 216 | : (bio_rw(bio) == READ) |
b411b363 PR |
217 | ? read_completed_with_error |
218 | : read_ahead_completed_with_error; | |
219 | } else | |
220 | what = completed_ok; | |
221 | ||
222 | bio_put(req->private_bio); | |
223 | req->private_bio = ERR_PTR(error); | |
224 | ||
a115413d LE |
225 | /* not req_mod(), we need irqsave here! */ |
226 | spin_lock_irqsave(&mdev->req_lock, flags); | |
227 | __req_mod(req, what, &m); | |
228 | spin_unlock_irqrestore(&mdev->req_lock, flags); | |
229 | ||
230 | if (m.bio) | |
231 | complete_master_bio(mdev, &m); | |
b411b363 PR |
232 | } |
233 | ||
b411b363 PR |
234 | int w_read_retry_remote(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
235 | { | |
236 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
237 | ||
238 | /* We should not detach for read io-error, | |
239 | * but try to WRITE the P_DATA_REPLY to the failed location, | |
240 | * to give the disk the chance to relocate that block */ | |
241 | ||
242 | spin_lock_irq(&mdev->req_lock); | |
d255e5ff LE |
243 | if (cancel || mdev->state.pdsk != D_UP_TO_DATE) { |
244 | _req_mod(req, read_retry_remote_canceled); | |
b411b363 | 245 | spin_unlock_irq(&mdev->req_lock); |
b411b363 PR |
246 | return 1; |
247 | } | |
248 | spin_unlock_irq(&mdev->req_lock); | |
249 | ||
250 | return w_send_read_req(mdev, w, 0); | |
251 | } | |
252 | ||
45bb912b LE |
253 | void drbd_csum_ee(struct drbd_conf *mdev, struct crypto_hash *tfm, struct drbd_epoch_entry *e, void *digest) |
254 | { | |
255 | struct hash_desc desc; | |
256 | struct scatterlist sg; | |
257 | struct page *page = e->pages; | |
258 | struct page *tmp; | |
259 | unsigned len; | |
260 | ||
261 | desc.tfm = tfm; | |
262 | desc.flags = 0; | |
263 | ||
264 | sg_init_table(&sg, 1); | |
265 | crypto_hash_init(&desc); | |
266 | ||
267 | while ((tmp = page_chain_next(page))) { | |
268 | /* all but the last page will be fully used */ | |
269 | sg_set_page(&sg, page, PAGE_SIZE, 0); | |
270 | crypto_hash_update(&desc, &sg, sg.length); | |
271 | page = tmp; | |
272 | } | |
273 | /* and now the last, possibly only partially used page */ | |
274 | len = e->size & (PAGE_SIZE - 1); | |
275 | sg_set_page(&sg, page, len ?: PAGE_SIZE, 0); | |
276 | crypto_hash_update(&desc, &sg, sg.length); | |
277 | crypto_hash_final(&desc, digest); | |
278 | } | |
279 | ||
280 | void drbd_csum_bio(struct drbd_conf *mdev, struct crypto_hash *tfm, struct bio *bio, void *digest) | |
b411b363 PR |
281 | { |
282 | struct hash_desc desc; | |
283 | struct scatterlist sg; | |
284 | struct bio_vec *bvec; | |
285 | int i; | |
286 | ||
287 | desc.tfm = tfm; | |
288 | desc.flags = 0; | |
289 | ||
290 | sg_init_table(&sg, 1); | |
291 | crypto_hash_init(&desc); | |
292 | ||
293 | __bio_for_each_segment(bvec, bio, i, 0) { | |
294 | sg_set_page(&sg, bvec->bv_page, bvec->bv_len, bvec->bv_offset); | |
295 | crypto_hash_update(&desc, &sg, sg.length); | |
296 | } | |
297 | crypto_hash_final(&desc, digest); | |
298 | } | |
299 | ||
53ea4331 LE |
300 | /* TODO merge common code with w_e_end_ov_req */ |
301 | int w_e_send_csum(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
b411b363 PR |
302 | { |
303 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); | |
304 | int digest_size; | |
305 | void *digest; | |
53ea4331 | 306 | int ok = 1; |
b411b363 PR |
307 | |
308 | D_ASSERT(e->block_id == DRBD_MAGIC + 0xbeef); | |
309 | ||
53ea4331 LE |
310 | if (unlikely(cancel)) |
311 | goto out; | |
b411b363 | 312 | |
53ea4331 LE |
313 | if (likely((e->flags & EE_WAS_ERROR) != 0)) |
314 | goto out; | |
b411b363 | 315 | |
53ea4331 LE |
316 | digest_size = crypto_hash_digestsize(mdev->csums_tfm); |
317 | digest = kmalloc(digest_size, GFP_NOIO); | |
318 | if (digest) { | |
319 | sector_t sector = e->sector; | |
320 | unsigned int size = e->size; | |
321 | drbd_csum_ee(mdev, mdev->csums_tfm, e, digest); | |
322 | /* Free e and pages before send. | |
323 | * In case we block on congestion, we could otherwise run into | |
324 | * some distributed deadlock, if the other side blocks on | |
325 | * congestion as well, because our receiver blocks in | |
326 | * drbd_pp_alloc due to pp_in_use > max_buffers. */ | |
327 | drbd_free_ee(mdev, e); | |
328 | e = NULL; | |
329 | inc_rs_pending(mdev); | |
330 | ok = drbd_send_drequest_csum(mdev, sector, size, | |
331 | digest, digest_size, | |
332 | P_CSUM_RS_REQUEST); | |
333 | kfree(digest); | |
334 | } else { | |
335 | dev_err(DEV, "kmalloc() of digest failed.\n"); | |
336 | ok = 0; | |
337 | } | |
b411b363 | 338 | |
53ea4331 LE |
339 | out: |
340 | if (e) | |
341 | drbd_free_ee(mdev, e); | |
b411b363 PR |
342 | |
343 | if (unlikely(!ok)) | |
344 | dev_err(DEV, "drbd_send_drequest(..., csum) failed\n"); | |
345 | return ok; | |
346 | } | |
347 | ||
348 | #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) | |
349 | ||
350 | static int read_for_csum(struct drbd_conf *mdev, sector_t sector, int size) | |
351 | { | |
352 | struct drbd_epoch_entry *e; | |
353 | ||
354 | if (!get_ldev(mdev)) | |
80a40e43 | 355 | return -EIO; |
b411b363 | 356 | |
e3555d85 | 357 | if (drbd_rs_should_slow_down(mdev, sector)) |
0f0601f4 LE |
358 | goto defer; |
359 | ||
b411b363 PR |
360 | /* GFP_TRY, because if there is no memory available right now, this may |
361 | * be rescheduled for later. It is "only" background resync, after all. */ | |
362 | e = drbd_alloc_ee(mdev, DRBD_MAGIC+0xbeef, sector, size, GFP_TRY); | |
45bb912b | 363 | if (!e) |
80a40e43 | 364 | goto defer; |
b411b363 | 365 | |
80a40e43 | 366 | e->w.cb = w_e_send_csum; |
b411b363 PR |
367 | spin_lock_irq(&mdev->req_lock); |
368 | list_add(&e->w.list, &mdev->read_ee); | |
369 | spin_unlock_irq(&mdev->req_lock); | |
370 | ||
0f0601f4 | 371 | atomic_add(size >> 9, &mdev->rs_sect_ev); |
45bb912b | 372 | if (drbd_submit_ee(mdev, e, READ, DRBD_FAULT_RS_RD) == 0) |
80a40e43 | 373 | return 0; |
b411b363 | 374 | |
10f6d992 LE |
375 | /* If it failed because of ENOMEM, retry should help. If it failed |
376 | * because bio_add_page failed (probably broken lower level driver), | |
377 | * retry may or may not help. | |
378 | * If it does not, you may need to force disconnect. */ | |
22cc37a9 LE |
379 | spin_lock_irq(&mdev->req_lock); |
380 | list_del(&e->w.list); | |
381 | spin_unlock_irq(&mdev->req_lock); | |
382 | ||
45bb912b | 383 | drbd_free_ee(mdev, e); |
80a40e43 | 384 | defer: |
45bb912b | 385 | put_ldev(mdev); |
80a40e43 | 386 | return -EAGAIN; |
b411b363 PR |
387 | } |
388 | ||
794abb75 | 389 | int w_resync_timer(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
b411b363 | 390 | { |
63106d3c PR |
391 | switch (mdev->state.conn) { |
392 | case C_VERIFY_S: | |
794abb75 | 393 | w_make_ov_request(mdev, w, cancel); |
63106d3c PR |
394 | break; |
395 | case C_SYNC_TARGET: | |
794abb75 | 396 | w_make_resync_request(mdev, w, cancel); |
63106d3c | 397 | break; |
b411b363 PR |
398 | } |
399 | ||
794abb75 PR |
400 | return 1; |
401 | } | |
402 | ||
403 | void resync_timer_fn(unsigned long data) | |
404 | { | |
405 | struct drbd_conf *mdev = (struct drbd_conf *) data; | |
406 | ||
407 | if (list_empty(&mdev->resync_work.list)) | |
b411b363 PR |
408 | drbd_queue_work(&mdev->data.work, &mdev->resync_work); |
409 | } | |
410 | ||
778f271d PR |
411 | static void fifo_set(struct fifo_buffer *fb, int value) |
412 | { | |
413 | int i; | |
414 | ||
415 | for (i = 0; i < fb->size; i++) | |
f10f2623 | 416 | fb->values[i] = value; |
778f271d PR |
417 | } |
418 | ||
419 | static int fifo_push(struct fifo_buffer *fb, int value) | |
420 | { | |
421 | int ov; | |
422 | ||
423 | ov = fb->values[fb->head_index]; | |
424 | fb->values[fb->head_index++] = value; | |
425 | ||
426 | if (fb->head_index >= fb->size) | |
427 | fb->head_index = 0; | |
428 | ||
429 | return ov; | |
430 | } | |
431 | ||
432 | static void fifo_add_val(struct fifo_buffer *fb, int value) | |
433 | { | |
434 | int i; | |
435 | ||
436 | for (i = 0; i < fb->size; i++) | |
437 | fb->values[i] += value; | |
438 | } | |
439 | ||
9d77a5fe | 440 | static int drbd_rs_controller(struct drbd_conf *mdev) |
778f271d PR |
441 | { |
442 | unsigned int sect_in; /* Number of sectors that came in since the last turn */ | |
443 | unsigned int want; /* The number of sectors we want in the proxy */ | |
444 | int req_sect; /* Number of sectors to request in this turn */ | |
445 | int correction; /* Number of sectors more we need in the proxy*/ | |
446 | int cps; /* correction per invocation of drbd_rs_controller() */ | |
447 | int steps; /* Number of time steps to plan ahead */ | |
448 | int curr_corr; | |
449 | int max_sect; | |
450 | ||
451 | sect_in = atomic_xchg(&mdev->rs_sect_in, 0); /* Number of sectors that came in */ | |
452 | mdev->rs_in_flight -= sect_in; | |
453 | ||
454 | spin_lock(&mdev->peer_seq_lock); /* get an atomic view on mdev->rs_plan_s */ | |
455 | ||
456 | steps = mdev->rs_plan_s.size; /* (mdev->sync_conf.c_plan_ahead * 10 * SLEEP_TIME) / HZ; */ | |
457 | ||
458 | if (mdev->rs_in_flight + sect_in == 0) { /* At start of resync */ | |
459 | want = ((mdev->sync_conf.rate * 2 * SLEEP_TIME) / HZ) * steps; | |
460 | } else { /* normal path */ | |
461 | want = mdev->sync_conf.c_fill_target ? mdev->sync_conf.c_fill_target : | |
462 | sect_in * mdev->sync_conf.c_delay_target * HZ / (SLEEP_TIME * 10); | |
463 | } | |
464 | ||
465 | correction = want - mdev->rs_in_flight - mdev->rs_planed; | |
466 | ||
467 | /* Plan ahead */ | |
468 | cps = correction / steps; | |
469 | fifo_add_val(&mdev->rs_plan_s, cps); | |
470 | mdev->rs_planed += cps * steps; | |
471 | ||
472 | /* What we do in this step */ | |
473 | curr_corr = fifo_push(&mdev->rs_plan_s, 0); | |
474 | spin_unlock(&mdev->peer_seq_lock); | |
475 | mdev->rs_planed -= curr_corr; | |
476 | ||
477 | req_sect = sect_in + curr_corr; | |
478 | if (req_sect < 0) | |
479 | req_sect = 0; | |
480 | ||
481 | max_sect = (mdev->sync_conf.c_max_rate * 2 * SLEEP_TIME) / HZ; | |
482 | if (req_sect > max_sect) | |
483 | req_sect = max_sect; | |
484 | ||
485 | /* | |
486 | dev_warn(DEV, "si=%u if=%d wa=%u co=%d st=%d cps=%d pl=%d cc=%d rs=%d\n", | |
487 | sect_in, mdev->rs_in_flight, want, correction, | |
488 | steps, cps, mdev->rs_planed, curr_corr, req_sect); | |
489 | */ | |
490 | ||
491 | return req_sect; | |
492 | } | |
493 | ||
9d77a5fe | 494 | static int drbd_rs_number_requests(struct drbd_conf *mdev) |
e65f440d LE |
495 | { |
496 | int number; | |
497 | if (mdev->rs_plan_s.size) { /* mdev->sync_conf.c_plan_ahead */ | |
498 | number = drbd_rs_controller(mdev) >> (BM_BLOCK_SHIFT - 9); | |
499 | mdev->c_sync_rate = number * HZ * (BM_BLOCK_SIZE / 1024) / SLEEP_TIME; | |
500 | } else { | |
501 | mdev->c_sync_rate = mdev->sync_conf.rate; | |
502 | number = SLEEP_TIME * mdev->c_sync_rate / ((BM_BLOCK_SIZE / 1024) * HZ); | |
503 | } | |
504 | ||
e65f440d LE |
505 | /* ignore the amount of pending requests, the resync controller should |
506 | * throttle down to incoming reply rate soon enough anyways. */ | |
507 | return number; | |
508 | } | |
509 | ||
9d77a5fe PR |
510 | static int w_make_resync_request(struct drbd_conf *mdev, |
511 | struct drbd_work *w, int cancel) | |
b411b363 PR |
512 | { |
513 | unsigned long bit; | |
514 | sector_t sector; | |
515 | const sector_t capacity = drbd_get_capacity(mdev->this_bdev); | |
1816a2b4 | 516 | int max_bio_size; |
e65f440d | 517 | int number, rollback_i, size; |
b411b363 | 518 | int align, queued, sndbuf; |
0f0601f4 | 519 | int i = 0; |
b411b363 PR |
520 | |
521 | if (unlikely(cancel)) | |
522 | return 1; | |
523 | ||
af85e8e8 LE |
524 | if (mdev->rs_total == 0) { |
525 | /* empty resync? */ | |
526 | drbd_resync_finished(mdev); | |
527 | return 1; | |
528 | } | |
529 | ||
b411b363 PR |
530 | if (!get_ldev(mdev)) { |
531 | /* Since we only need to access mdev->rsync a | |
532 | get_ldev_if_state(mdev,D_FAILED) would be sufficient, but | |
533 | to continue resync with a broken disk makes no sense at | |
534 | all */ | |
535 | dev_err(DEV, "Disk broke down during resync!\n"); | |
b411b363 PR |
536 | return 1; |
537 | } | |
538 | ||
bb3d000c LE |
539 | /* starting with drbd 8.3.8, we can handle multi-bio EEs, |
540 | * if it should be necessary */ | |
1816a2b4 LE |
541 | max_bio_size = |
542 | mdev->agreed_pro_version < 94 ? queue_max_hw_sectors(mdev->rq_queue) << 9 : | |
543 | mdev->agreed_pro_version < 95 ? DRBD_MAX_SIZE_H80_PACKET : DRBD_MAX_BIO_SIZE; | |
bb3d000c | 544 | |
e65f440d LE |
545 | number = drbd_rs_number_requests(mdev); |
546 | if (number == 0) | |
0f0601f4 | 547 | goto requeue; |
b411b363 | 548 | |
b411b363 PR |
549 | for (i = 0; i < number; i++) { |
550 | /* Stop generating RS requests, when half of the send buffer is filled */ | |
551 | mutex_lock(&mdev->data.mutex); | |
552 | if (mdev->data.socket) { | |
553 | queued = mdev->data.socket->sk->sk_wmem_queued; | |
554 | sndbuf = mdev->data.socket->sk->sk_sndbuf; | |
555 | } else { | |
556 | queued = 1; | |
557 | sndbuf = 0; | |
558 | } | |
559 | mutex_unlock(&mdev->data.mutex); | |
560 | if (queued > sndbuf / 2) | |
561 | goto requeue; | |
562 | ||
563 | next_sector: | |
564 | size = BM_BLOCK_SIZE; | |
565 | bit = drbd_bm_find_next(mdev, mdev->bm_resync_fo); | |
566 | ||
4b0715f0 | 567 | if (bit == DRBD_END_OF_BITMAP) { |
b411b363 | 568 | mdev->bm_resync_fo = drbd_bm_bits(mdev); |
b411b363 PR |
569 | put_ldev(mdev); |
570 | return 1; | |
571 | } | |
572 | ||
573 | sector = BM_BIT_TO_SECT(bit); | |
574 | ||
e3555d85 PR |
575 | if (drbd_rs_should_slow_down(mdev, sector) || |
576 | drbd_try_rs_begin_io(mdev, sector)) { | |
b411b363 PR |
577 | mdev->bm_resync_fo = bit; |
578 | goto requeue; | |
579 | } | |
580 | mdev->bm_resync_fo = bit + 1; | |
581 | ||
582 | if (unlikely(drbd_bm_test_bit(mdev, bit) == 0)) { | |
583 | drbd_rs_complete_io(mdev, sector); | |
584 | goto next_sector; | |
585 | } | |
586 | ||
1816a2b4 | 587 | #if DRBD_MAX_BIO_SIZE > BM_BLOCK_SIZE |
b411b363 PR |
588 | /* try to find some adjacent bits. |
589 | * we stop if we have already the maximum req size. | |
590 | * | |
591 | * Additionally always align bigger requests, in order to | |
592 | * be prepared for all stripe sizes of software RAIDs. | |
b411b363 PR |
593 | */ |
594 | align = 1; | |
d207450c | 595 | rollback_i = i; |
b411b363 | 596 | for (;;) { |
1816a2b4 | 597 | if (size + BM_BLOCK_SIZE > max_bio_size) |
b411b363 PR |
598 | break; |
599 | ||
600 | /* Be always aligned */ | |
601 | if (sector & ((1<<(align+3))-1)) | |
602 | break; | |
603 | ||
604 | /* do not cross extent boundaries */ | |
605 | if (((bit+1) & BM_BLOCKS_PER_BM_EXT_MASK) == 0) | |
606 | break; | |
607 | /* now, is it actually dirty, after all? | |
608 | * caution, drbd_bm_test_bit is tri-state for some | |
609 | * obscure reason; ( b == 0 ) would get the out-of-band | |
610 | * only accidentally right because of the "oddly sized" | |
611 | * adjustment below */ | |
612 | if (drbd_bm_test_bit(mdev, bit+1) != 1) | |
613 | break; | |
614 | bit++; | |
615 | size += BM_BLOCK_SIZE; | |
616 | if ((BM_BLOCK_SIZE << align) <= size) | |
617 | align++; | |
618 | i++; | |
619 | } | |
620 | /* if we merged some, | |
621 | * reset the offset to start the next drbd_bm_find_next from */ | |
622 | if (size > BM_BLOCK_SIZE) | |
623 | mdev->bm_resync_fo = bit + 1; | |
624 | #endif | |
625 | ||
626 | /* adjust very last sectors, in case we are oddly sized */ | |
627 | if (sector + (size>>9) > capacity) | |
628 | size = (capacity-sector)<<9; | |
629 | if (mdev->agreed_pro_version >= 89 && mdev->csums_tfm) { | |
630 | switch (read_for_csum(mdev, sector, size)) { | |
80a40e43 | 631 | case -EIO: /* Disk failure */ |
b411b363 PR |
632 | put_ldev(mdev); |
633 | return 0; | |
80a40e43 | 634 | case -EAGAIN: /* allocation failed, or ldev busy */ |
b411b363 PR |
635 | drbd_rs_complete_io(mdev, sector); |
636 | mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); | |
d207450c | 637 | i = rollback_i; |
b411b363 | 638 | goto requeue; |
80a40e43 LE |
639 | case 0: |
640 | /* everything ok */ | |
641 | break; | |
642 | default: | |
643 | BUG(); | |
b411b363 PR |
644 | } |
645 | } else { | |
646 | inc_rs_pending(mdev); | |
647 | if (!drbd_send_drequest(mdev, P_RS_DATA_REQUEST, | |
648 | sector, size, ID_SYNCER)) { | |
649 | dev_err(DEV, "drbd_send_drequest() failed, aborting...\n"); | |
650 | dec_rs_pending(mdev); | |
651 | put_ldev(mdev); | |
652 | return 0; | |
653 | } | |
654 | } | |
655 | } | |
656 | ||
657 | if (mdev->bm_resync_fo >= drbd_bm_bits(mdev)) { | |
658 | /* last syncer _request_ was sent, | |
659 | * but the P_RS_DATA_REPLY not yet received. sync will end (and | |
660 | * next sync group will resume), as soon as we receive the last | |
661 | * resync data block, and the last bit is cleared. | |
662 | * until then resync "work" is "inactive" ... | |
663 | */ | |
b411b363 PR |
664 | put_ldev(mdev); |
665 | return 1; | |
666 | } | |
667 | ||
668 | requeue: | |
778f271d | 669 | mdev->rs_in_flight += (i << (BM_BLOCK_SHIFT - 9)); |
b411b363 PR |
670 | mod_timer(&mdev->resync_timer, jiffies + SLEEP_TIME); |
671 | put_ldev(mdev); | |
672 | return 1; | |
673 | } | |
674 | ||
675 | static int w_make_ov_request(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
676 | { | |
677 | int number, i, size; | |
678 | sector_t sector; | |
679 | const sector_t capacity = drbd_get_capacity(mdev->this_bdev); | |
680 | ||
681 | if (unlikely(cancel)) | |
682 | return 1; | |
683 | ||
2649f080 | 684 | number = drbd_rs_number_requests(mdev); |
b411b363 PR |
685 | |
686 | sector = mdev->ov_position; | |
687 | for (i = 0; i < number; i++) { | |
688 | if (sector >= capacity) { | |
b411b363 PR |
689 | return 1; |
690 | } | |
691 | ||
692 | size = BM_BLOCK_SIZE; | |
693 | ||
e3555d85 PR |
694 | if (drbd_rs_should_slow_down(mdev, sector) || |
695 | drbd_try_rs_begin_io(mdev, sector)) { | |
b411b363 PR |
696 | mdev->ov_position = sector; |
697 | goto requeue; | |
698 | } | |
699 | ||
700 | if (sector + (size>>9) > capacity) | |
701 | size = (capacity-sector)<<9; | |
702 | ||
703 | inc_rs_pending(mdev); | |
704 | if (!drbd_send_ov_request(mdev, sector, size)) { | |
705 | dec_rs_pending(mdev); | |
706 | return 0; | |
707 | } | |
708 | sector += BM_SECT_PER_BIT; | |
709 | } | |
710 | mdev->ov_position = sector; | |
711 | ||
712 | requeue: | |
2649f080 | 713 | mdev->rs_in_flight += (i << (BM_BLOCK_SHIFT - 9)); |
b411b363 PR |
714 | mod_timer(&mdev->resync_timer, jiffies + SLEEP_TIME); |
715 | return 1; | |
716 | } | |
717 | ||
c4752ef1 | 718 | |
370a43e7 PR |
719 | void start_resync_timer_fn(unsigned long data) |
720 | { | |
721 | struct drbd_conf *mdev = (struct drbd_conf *) data; | |
722 | ||
723 | drbd_queue_work(&mdev->data.work, &mdev->start_resync_work); | |
724 | } | |
725 | ||
c4752ef1 PR |
726 | int w_start_resync(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
727 | { | |
370a43e7 PR |
728 | if (atomic_read(&mdev->unacked_cnt) || atomic_read(&mdev->rs_pending_cnt)) { |
729 | dev_warn(DEV, "w_start_resync later...\n"); | |
730 | mdev->start_resync_timer.expires = jiffies + HZ/10; | |
731 | add_timer(&mdev->start_resync_timer); | |
732 | return 1; | |
733 | } | |
c4752ef1 | 734 | |
370a43e7 PR |
735 | drbd_start_resync(mdev, C_SYNC_SOURCE); |
736 | clear_bit(AHEAD_TO_SYNC_SOURCE, &mdev->current_epoch->flags); | |
c4752ef1 PR |
737 | return 1; |
738 | } | |
739 | ||
b411b363 PR |
740 | int w_ov_finished(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
741 | { | |
742 | kfree(w); | |
743 | ov_oos_print(mdev); | |
744 | drbd_resync_finished(mdev); | |
745 | ||
746 | return 1; | |
747 | } | |
748 | ||
749 | static int w_resync_finished(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
750 | { | |
751 | kfree(w); | |
752 | ||
753 | drbd_resync_finished(mdev); | |
754 | ||
755 | return 1; | |
756 | } | |
757 | ||
af85e8e8 LE |
758 | static void ping_peer(struct drbd_conf *mdev) |
759 | { | |
760 | clear_bit(GOT_PING_ACK, &mdev->flags); | |
761 | request_ping(mdev); | |
762 | wait_event(mdev->misc_wait, | |
763 | test_bit(GOT_PING_ACK, &mdev->flags) || mdev->state.conn < C_CONNECTED); | |
764 | } | |
765 | ||
b411b363 PR |
766 | int drbd_resync_finished(struct drbd_conf *mdev) |
767 | { | |
768 | unsigned long db, dt, dbdt; | |
769 | unsigned long n_oos; | |
770 | union drbd_state os, ns; | |
771 | struct drbd_work *w; | |
772 | char *khelper_cmd = NULL; | |
26525618 | 773 | int verify_done = 0; |
b411b363 PR |
774 | |
775 | /* Remove all elements from the resync LRU. Since future actions | |
776 | * might set bits in the (main) bitmap, then the entries in the | |
777 | * resync LRU would be wrong. */ | |
778 | if (drbd_rs_del_all(mdev)) { | |
779 | /* In case this is not possible now, most probably because | |
780 | * there are P_RS_DATA_REPLY Packets lingering on the worker's | |
781 | * queue (or even the read operations for those packets | |
782 | * is not finished by now). Retry in 100ms. */ | |
783 | ||
20ee6390 | 784 | schedule_timeout_interruptible(HZ / 10); |
b411b363 PR |
785 | w = kmalloc(sizeof(struct drbd_work), GFP_ATOMIC); |
786 | if (w) { | |
787 | w->cb = w_resync_finished; | |
788 | drbd_queue_work(&mdev->data.work, w); | |
789 | return 1; | |
790 | } | |
791 | dev_err(DEV, "Warn failed to drbd_rs_del_all() and to kmalloc(w).\n"); | |
792 | } | |
793 | ||
794 | dt = (jiffies - mdev->rs_start - mdev->rs_paused) / HZ; | |
795 | if (dt <= 0) | |
796 | dt = 1; | |
797 | db = mdev->rs_total; | |
798 | dbdt = Bit2KB(db/dt); | |
799 | mdev->rs_paused /= HZ; | |
800 | ||
801 | if (!get_ldev(mdev)) | |
802 | goto out; | |
803 | ||
af85e8e8 LE |
804 | ping_peer(mdev); |
805 | ||
b411b363 PR |
806 | spin_lock_irq(&mdev->req_lock); |
807 | os = mdev->state; | |
808 | ||
26525618 LE |
809 | verify_done = (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T); |
810 | ||
b411b363 PR |
811 | /* This protects us against multiple calls (that can happen in the presence |
812 | of application IO), and against connectivity loss just before we arrive here. */ | |
813 | if (os.conn <= C_CONNECTED) | |
814 | goto out_unlock; | |
815 | ||
816 | ns = os; | |
817 | ns.conn = C_CONNECTED; | |
818 | ||
819 | dev_info(DEV, "%s done (total %lu sec; paused %lu sec; %lu K/sec)\n", | |
26525618 | 820 | verify_done ? "Online verify " : "Resync", |
b411b363 PR |
821 | dt + mdev->rs_paused, mdev->rs_paused, dbdt); |
822 | ||
823 | n_oos = drbd_bm_total_weight(mdev); | |
824 | ||
825 | if (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) { | |
826 | if (n_oos) { | |
827 | dev_alert(DEV, "Online verify found %lu %dk block out of sync!\n", | |
828 | n_oos, Bit2KB(1)); | |
829 | khelper_cmd = "out-of-sync"; | |
830 | } | |
831 | } else { | |
832 | D_ASSERT((n_oos - mdev->rs_failed) == 0); | |
833 | ||
834 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) | |
835 | khelper_cmd = "after-resync-target"; | |
836 | ||
837 | if (mdev->csums_tfm && mdev->rs_total) { | |
838 | const unsigned long s = mdev->rs_same_csum; | |
839 | const unsigned long t = mdev->rs_total; | |
840 | const int ratio = | |
841 | (t == 0) ? 0 : | |
842 | (t < 100000) ? ((s*100)/t) : (s/(t/100)); | |
24c4830c | 843 | dev_info(DEV, "%u %% had equal checksums, eliminated: %luK; " |
b411b363 PR |
844 | "transferred %luK total %luK\n", |
845 | ratio, | |
846 | Bit2KB(mdev->rs_same_csum), | |
847 | Bit2KB(mdev->rs_total - mdev->rs_same_csum), | |
848 | Bit2KB(mdev->rs_total)); | |
849 | } | |
850 | } | |
851 | ||
852 | if (mdev->rs_failed) { | |
853 | dev_info(DEV, " %lu failed blocks\n", mdev->rs_failed); | |
854 | ||
855 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) { | |
856 | ns.disk = D_INCONSISTENT; | |
857 | ns.pdsk = D_UP_TO_DATE; | |
858 | } else { | |
859 | ns.disk = D_UP_TO_DATE; | |
860 | ns.pdsk = D_INCONSISTENT; | |
861 | } | |
862 | } else { | |
863 | ns.disk = D_UP_TO_DATE; | |
864 | ns.pdsk = D_UP_TO_DATE; | |
865 | ||
866 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) { | |
867 | if (mdev->p_uuid) { | |
868 | int i; | |
869 | for (i = UI_BITMAP ; i <= UI_HISTORY_END ; i++) | |
870 | _drbd_uuid_set(mdev, i, mdev->p_uuid[i]); | |
871 | drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_CURRENT]); | |
872 | _drbd_uuid_set(mdev, UI_CURRENT, mdev->p_uuid[UI_CURRENT]); | |
873 | } else { | |
874 | dev_err(DEV, "mdev->p_uuid is NULL! BUG\n"); | |
875 | } | |
876 | } | |
877 | ||
62b0da3a LE |
878 | if (!(os.conn == C_VERIFY_S || os.conn == C_VERIFY_T)) { |
879 | /* for verify runs, we don't update uuids here, | |
880 | * so there would be nothing to report. */ | |
881 | drbd_uuid_set_bm(mdev, 0UL); | |
882 | drbd_print_uuids(mdev, "updated UUIDs"); | |
883 | if (mdev->p_uuid) { | |
884 | /* Now the two UUID sets are equal, update what we | |
885 | * know of the peer. */ | |
886 | int i; | |
887 | for (i = UI_CURRENT ; i <= UI_HISTORY_END ; i++) | |
888 | mdev->p_uuid[i] = mdev->ldev->md.uuid[i]; | |
889 | } | |
b411b363 PR |
890 | } |
891 | } | |
892 | ||
893 | _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); | |
894 | out_unlock: | |
895 | spin_unlock_irq(&mdev->req_lock); | |
896 | put_ldev(mdev); | |
897 | out: | |
898 | mdev->rs_total = 0; | |
899 | mdev->rs_failed = 0; | |
900 | mdev->rs_paused = 0; | |
26525618 LE |
901 | if (verify_done) |
902 | mdev->ov_start_sector = 0; | |
b411b363 | 903 | |
13d42685 LE |
904 | drbd_md_sync(mdev); |
905 | ||
b411b363 PR |
906 | if (khelper_cmd) |
907 | drbd_khelper(mdev, khelper_cmd); | |
908 | ||
909 | return 1; | |
910 | } | |
911 | ||
912 | /* helper */ | |
913 | static void move_to_net_ee_or_free(struct drbd_conf *mdev, struct drbd_epoch_entry *e) | |
914 | { | |
45bb912b | 915 | if (drbd_ee_has_active_page(e)) { |
b411b363 | 916 | /* This might happen if sendpage() has not finished */ |
78db8928 | 917 | int i = (e->size + PAGE_SIZE -1) >> PAGE_SHIFT; |
435f0740 LE |
918 | atomic_add(i, &mdev->pp_in_use_by_net); |
919 | atomic_sub(i, &mdev->pp_in_use); | |
b411b363 PR |
920 | spin_lock_irq(&mdev->req_lock); |
921 | list_add_tail(&e->w.list, &mdev->net_ee); | |
922 | spin_unlock_irq(&mdev->req_lock); | |
435f0740 | 923 | wake_up(&drbd_pp_wait); |
b411b363 PR |
924 | } else |
925 | drbd_free_ee(mdev, e); | |
926 | } | |
927 | ||
928 | /** | |
929 | * w_e_end_data_req() - Worker callback, to send a P_DATA_REPLY packet in response to a P_DATA_REQUEST | |
930 | * @mdev: DRBD device. | |
931 | * @w: work object. | |
932 | * @cancel: The connection will be closed anyways | |
933 | */ | |
934 | int w_e_end_data_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
935 | { | |
936 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); | |
937 | int ok; | |
938 | ||
939 | if (unlikely(cancel)) { | |
940 | drbd_free_ee(mdev, e); | |
941 | dec_unacked(mdev); | |
942 | return 1; | |
943 | } | |
944 | ||
45bb912b | 945 | if (likely((e->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
946 | ok = drbd_send_block(mdev, P_DATA_REPLY, e); |
947 | } else { | |
948 | if (__ratelimit(&drbd_ratelimit_state)) | |
949 | dev_err(DEV, "Sending NegDReply. sector=%llus.\n", | |
950 | (unsigned long long)e->sector); | |
951 | ||
952 | ok = drbd_send_ack(mdev, P_NEG_DREPLY, e); | |
953 | } | |
954 | ||
955 | dec_unacked(mdev); | |
956 | ||
957 | move_to_net_ee_or_free(mdev, e); | |
958 | ||
959 | if (unlikely(!ok)) | |
960 | dev_err(DEV, "drbd_send_block() failed\n"); | |
961 | return ok; | |
962 | } | |
963 | ||
964 | /** | |
965 | * w_e_end_rsdata_req() - Worker callback to send a P_RS_DATA_REPLY packet in response to a P_RS_DATA_REQUESTRS | |
966 | * @mdev: DRBD device. | |
967 | * @w: work object. | |
968 | * @cancel: The connection will be closed anyways | |
969 | */ | |
970 | int w_e_end_rsdata_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
971 | { | |
972 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); | |
973 | int ok; | |
974 | ||
975 | if (unlikely(cancel)) { | |
976 | drbd_free_ee(mdev, e); | |
977 | dec_unacked(mdev); | |
978 | return 1; | |
979 | } | |
980 | ||
981 | if (get_ldev_if_state(mdev, D_FAILED)) { | |
982 | drbd_rs_complete_io(mdev, e->sector); | |
983 | put_ldev(mdev); | |
984 | } | |
985 | ||
d612d309 PR |
986 | if (mdev->state.conn == C_AHEAD) { |
987 | ok = drbd_send_ack(mdev, P_RS_CANCEL, e); | |
988 | } else if (likely((e->flags & EE_WAS_ERROR) == 0)) { | |
b411b363 PR |
989 | if (likely(mdev->state.pdsk >= D_INCONSISTENT)) { |
990 | inc_rs_pending(mdev); | |
991 | ok = drbd_send_block(mdev, P_RS_DATA_REPLY, e); | |
992 | } else { | |
993 | if (__ratelimit(&drbd_ratelimit_state)) | |
994 | dev_err(DEV, "Not sending RSDataReply, " | |
995 | "partner DISKLESS!\n"); | |
996 | ok = 1; | |
997 | } | |
998 | } else { | |
999 | if (__ratelimit(&drbd_ratelimit_state)) | |
1000 | dev_err(DEV, "Sending NegRSDReply. sector %llus.\n", | |
1001 | (unsigned long long)e->sector); | |
1002 | ||
1003 | ok = drbd_send_ack(mdev, P_NEG_RS_DREPLY, e); | |
1004 | ||
1005 | /* update resync data with failure */ | |
1006 | drbd_rs_failed_io(mdev, e->sector, e->size); | |
1007 | } | |
1008 | ||
1009 | dec_unacked(mdev); | |
1010 | ||
1011 | move_to_net_ee_or_free(mdev, e); | |
1012 | ||
1013 | if (unlikely(!ok)) | |
1014 | dev_err(DEV, "drbd_send_block() failed\n"); | |
1015 | return ok; | |
1016 | } | |
1017 | ||
1018 | int w_e_end_csum_rs_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1019 | { | |
1020 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); | |
1021 | struct digest_info *di; | |
1022 | int digest_size; | |
1023 | void *digest = NULL; | |
1024 | int ok, eq = 0; | |
1025 | ||
1026 | if (unlikely(cancel)) { | |
1027 | drbd_free_ee(mdev, e); | |
1028 | dec_unacked(mdev); | |
1029 | return 1; | |
1030 | } | |
1031 | ||
1d53f09e LE |
1032 | if (get_ldev(mdev)) { |
1033 | drbd_rs_complete_io(mdev, e->sector); | |
1034 | put_ldev(mdev); | |
1035 | } | |
b411b363 | 1036 | |
85719573 | 1037 | di = e->digest; |
b411b363 | 1038 | |
45bb912b | 1039 | if (likely((e->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
1040 | /* quick hack to try to avoid a race against reconfiguration. |
1041 | * a real fix would be much more involved, | |
1042 | * introducing more locking mechanisms */ | |
1043 | if (mdev->csums_tfm) { | |
1044 | digest_size = crypto_hash_digestsize(mdev->csums_tfm); | |
1045 | D_ASSERT(digest_size == di->digest_size); | |
1046 | digest = kmalloc(digest_size, GFP_NOIO); | |
1047 | } | |
1048 | if (digest) { | |
45bb912b | 1049 | drbd_csum_ee(mdev, mdev->csums_tfm, e, digest); |
b411b363 PR |
1050 | eq = !memcmp(digest, di->digest, digest_size); |
1051 | kfree(digest); | |
1052 | } | |
1053 | ||
1054 | if (eq) { | |
1055 | drbd_set_in_sync(mdev, e->sector, e->size); | |
676396d5 LE |
1056 | /* rs_same_csums unit is BM_BLOCK_SIZE */ |
1057 | mdev->rs_same_csum += e->size >> BM_BLOCK_SHIFT; | |
b411b363 PR |
1058 | ok = drbd_send_ack(mdev, P_RS_IS_IN_SYNC, e); |
1059 | } else { | |
1060 | inc_rs_pending(mdev); | |
204bba99 PR |
1061 | e->block_id = ID_SYNCER; /* By setting block_id, digest pointer becomes invalid! */ |
1062 | e->flags &= ~EE_HAS_DIGEST; /* This e no longer has a digest pointer */ | |
1063 | kfree(di); | |
b411b363 PR |
1064 | ok = drbd_send_block(mdev, P_RS_DATA_REPLY, e); |
1065 | } | |
1066 | } else { | |
1067 | ok = drbd_send_ack(mdev, P_NEG_RS_DREPLY, e); | |
1068 | if (__ratelimit(&drbd_ratelimit_state)) | |
1069 | dev_err(DEV, "Sending NegDReply. I guess it gets messy.\n"); | |
1070 | } | |
1071 | ||
1072 | dec_unacked(mdev); | |
b411b363 PR |
1073 | move_to_net_ee_or_free(mdev, e); |
1074 | ||
1075 | if (unlikely(!ok)) | |
1076 | dev_err(DEV, "drbd_send_block/ack() failed\n"); | |
1077 | return ok; | |
1078 | } | |
1079 | ||
53ea4331 | 1080 | /* TODO merge common code with w_e_send_csum */ |
b411b363 PR |
1081 | int w_e_end_ov_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
1082 | { | |
1083 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); | |
53ea4331 LE |
1084 | sector_t sector = e->sector; |
1085 | unsigned int size = e->size; | |
b411b363 PR |
1086 | int digest_size; |
1087 | void *digest; | |
1088 | int ok = 1; | |
1089 | ||
1090 | if (unlikely(cancel)) | |
1091 | goto out; | |
1092 | ||
b411b363 | 1093 | digest_size = crypto_hash_digestsize(mdev->verify_tfm); |
b411b363 | 1094 | digest = kmalloc(digest_size, GFP_NOIO); |
8f21420e PR |
1095 | if (!digest) { |
1096 | ok = 0; /* terminate the connection in case the allocation failed */ | |
1097 | goto out; | |
b411b363 PR |
1098 | } |
1099 | ||
8f21420e PR |
1100 | if (likely(!(e->flags & EE_WAS_ERROR))) |
1101 | drbd_csum_ee(mdev, mdev->verify_tfm, e, digest); | |
1102 | else | |
1103 | memset(digest, 0, digest_size); | |
1104 | ||
53ea4331 LE |
1105 | /* Free e and pages before send. |
1106 | * In case we block on congestion, we could otherwise run into | |
1107 | * some distributed deadlock, if the other side blocks on | |
1108 | * congestion as well, because our receiver blocks in | |
1109 | * drbd_pp_alloc due to pp_in_use > max_buffers. */ | |
1110 | drbd_free_ee(mdev, e); | |
1111 | e = NULL; | |
8f21420e | 1112 | inc_rs_pending(mdev); |
53ea4331 LE |
1113 | ok = drbd_send_drequest_csum(mdev, sector, size, |
1114 | digest, digest_size, | |
1115 | P_OV_REPLY); | |
8f21420e PR |
1116 | if (!ok) |
1117 | dec_rs_pending(mdev); | |
1118 | kfree(digest); | |
1119 | ||
b411b363 | 1120 | out: |
53ea4331 LE |
1121 | if (e) |
1122 | drbd_free_ee(mdev, e); | |
b411b363 | 1123 | dec_unacked(mdev); |
b411b363 PR |
1124 | return ok; |
1125 | } | |
1126 | ||
1127 | void drbd_ov_oos_found(struct drbd_conf *mdev, sector_t sector, int size) | |
1128 | { | |
1129 | if (mdev->ov_last_oos_start + mdev->ov_last_oos_size == sector) { | |
1130 | mdev->ov_last_oos_size += size>>9; | |
1131 | } else { | |
1132 | mdev->ov_last_oos_start = sector; | |
1133 | mdev->ov_last_oos_size = size>>9; | |
1134 | } | |
1135 | drbd_set_out_of_sync(mdev, sector, size); | |
b411b363 PR |
1136 | } |
1137 | ||
1138 | int w_e_end_ov_reply(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1139 | { | |
1140 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); | |
1141 | struct digest_info *di; | |
b411b363 | 1142 | void *digest; |
53ea4331 LE |
1143 | sector_t sector = e->sector; |
1144 | unsigned int size = e->size; | |
1145 | int digest_size; | |
b411b363 PR |
1146 | int ok, eq = 0; |
1147 | ||
1148 | if (unlikely(cancel)) { | |
1149 | drbd_free_ee(mdev, e); | |
1150 | dec_unacked(mdev); | |
1151 | return 1; | |
1152 | } | |
1153 | ||
1154 | /* after "cancel", because after drbd_disconnect/drbd_rs_cancel_all | |
1155 | * the resync lru has been cleaned up already */ | |
1d53f09e LE |
1156 | if (get_ldev(mdev)) { |
1157 | drbd_rs_complete_io(mdev, e->sector); | |
1158 | put_ldev(mdev); | |
1159 | } | |
b411b363 | 1160 | |
85719573 | 1161 | di = e->digest; |
b411b363 | 1162 | |
45bb912b | 1163 | if (likely((e->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
1164 | digest_size = crypto_hash_digestsize(mdev->verify_tfm); |
1165 | digest = kmalloc(digest_size, GFP_NOIO); | |
1166 | if (digest) { | |
45bb912b | 1167 | drbd_csum_ee(mdev, mdev->verify_tfm, e, digest); |
b411b363 PR |
1168 | |
1169 | D_ASSERT(digest_size == di->digest_size); | |
1170 | eq = !memcmp(digest, di->digest, digest_size); | |
1171 | kfree(digest); | |
1172 | } | |
b411b363 PR |
1173 | } |
1174 | ||
53ea4331 LE |
1175 | /* Free e and pages before send. |
1176 | * In case we block on congestion, we could otherwise run into | |
1177 | * some distributed deadlock, if the other side blocks on | |
1178 | * congestion as well, because our receiver blocks in | |
1179 | * drbd_pp_alloc due to pp_in_use > max_buffers. */ | |
1180 | drbd_free_ee(mdev, e); | |
b411b363 | 1181 | if (!eq) |
53ea4331 | 1182 | drbd_ov_oos_found(mdev, sector, size); |
b411b363 PR |
1183 | else |
1184 | ov_oos_print(mdev); | |
1185 | ||
53ea4331 | 1186 | ok = drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, |
b411b363 PR |
1187 | eq ? ID_IN_SYNC : ID_OUT_OF_SYNC); |
1188 | ||
53ea4331 | 1189 | dec_unacked(mdev); |
b411b363 | 1190 | |
ea5442af LE |
1191 | --mdev->ov_left; |
1192 | ||
1193 | /* let's advance progress step marks only for every other megabyte */ | |
1194 | if ((mdev->ov_left & 0x200) == 0x200) | |
1195 | drbd_advance_rs_marks(mdev, mdev->ov_left); | |
1196 | ||
1197 | if (mdev->ov_left == 0) { | |
b411b363 PR |
1198 | ov_oos_print(mdev); |
1199 | drbd_resync_finished(mdev); | |
1200 | } | |
1201 | ||
1202 | return ok; | |
1203 | } | |
1204 | ||
1205 | int w_prev_work_done(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1206 | { | |
1207 | struct drbd_wq_barrier *b = container_of(w, struct drbd_wq_barrier, w); | |
1208 | complete(&b->done); | |
1209 | return 1; | |
1210 | } | |
1211 | ||
1212 | int w_send_barrier(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1213 | { | |
1214 | struct drbd_tl_epoch *b = container_of(w, struct drbd_tl_epoch, w); | |
1215 | struct p_barrier *p = &mdev->data.sbuf.barrier; | |
1216 | int ok = 1; | |
1217 | ||
1218 | /* really avoid racing with tl_clear. w.cb may have been referenced | |
1219 | * just before it was reassigned and re-queued, so double check that. | |
1220 | * actually, this race was harmless, since we only try to send the | |
1221 | * barrier packet here, and otherwise do nothing with the object. | |
1222 | * but compare with the head of w_clear_epoch */ | |
1223 | spin_lock_irq(&mdev->req_lock); | |
1224 | if (w->cb != w_send_barrier || mdev->state.conn < C_CONNECTED) | |
1225 | cancel = 1; | |
1226 | spin_unlock_irq(&mdev->req_lock); | |
1227 | if (cancel) | |
1228 | return 1; | |
1229 | ||
1230 | if (!drbd_get_data_sock(mdev)) | |
1231 | return 0; | |
1232 | p->barrier = b->br_number; | |
1233 | /* inc_ap_pending was done where this was queued. | |
1234 | * dec_ap_pending will be done in got_BarrierAck | |
1235 | * or (on connection loss) in w_clear_epoch. */ | |
1236 | ok = _drbd_send_cmd(mdev, mdev->data.socket, P_BARRIER, | |
0b70a13d | 1237 | (struct p_header80 *)p, sizeof(*p), 0); |
b411b363 PR |
1238 | drbd_put_data_sock(mdev); |
1239 | ||
1240 | return ok; | |
1241 | } | |
1242 | ||
1243 | int w_send_write_hint(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1244 | { | |
1245 | if (cancel) | |
1246 | return 1; | |
1247 | return drbd_send_short_cmd(mdev, P_UNPLUG_REMOTE); | |
1248 | } | |
1249 | ||
73a01a18 PR |
1250 | int w_send_oos(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
1251 | { | |
1252 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
1253 | int ok; | |
1254 | ||
1255 | if (unlikely(cancel)) { | |
1256 | req_mod(req, send_canceled); | |
1257 | return 1; | |
1258 | } | |
1259 | ||
1260 | ok = drbd_send_oos(mdev, req); | |
1261 | req_mod(req, oos_handed_to_network); | |
1262 | ||
1263 | return ok; | |
1264 | } | |
1265 | ||
b411b363 PR |
1266 | /** |
1267 | * w_send_dblock() - Worker callback to send a P_DATA packet in order to mirror a write request | |
1268 | * @mdev: DRBD device. | |
1269 | * @w: work object. | |
1270 | * @cancel: The connection will be closed anyways | |
1271 | */ | |
1272 | int w_send_dblock(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1273 | { | |
1274 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
1275 | int ok; | |
1276 | ||
1277 | if (unlikely(cancel)) { | |
1278 | req_mod(req, send_canceled); | |
1279 | return 1; | |
1280 | } | |
1281 | ||
1282 | ok = drbd_send_dblock(mdev, req); | |
1283 | req_mod(req, ok ? handed_over_to_network : send_failed); | |
1284 | ||
1285 | return ok; | |
1286 | } | |
1287 | ||
1288 | /** | |
1289 | * w_send_read_req() - Worker callback to send a read request (P_DATA_REQUEST) packet | |
1290 | * @mdev: DRBD device. | |
1291 | * @w: work object. | |
1292 | * @cancel: The connection will be closed anyways | |
1293 | */ | |
1294 | int w_send_read_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1295 | { | |
1296 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
1297 | int ok; | |
1298 | ||
1299 | if (unlikely(cancel)) { | |
1300 | req_mod(req, send_canceled); | |
1301 | return 1; | |
1302 | } | |
1303 | ||
1304 | ok = drbd_send_drequest(mdev, P_DATA_REQUEST, req->sector, req->size, | |
1305 | (unsigned long)req); | |
1306 | ||
1307 | if (!ok) { | |
1308 | /* ?? we set C_TIMEOUT or C_BROKEN_PIPE in drbd_send(); | |
1309 | * so this is probably redundant */ | |
1310 | if (mdev->state.conn >= C_CONNECTED) | |
1311 | drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE)); | |
1312 | } | |
1313 | req_mod(req, ok ? handed_over_to_network : send_failed); | |
1314 | ||
1315 | return ok; | |
1316 | } | |
1317 | ||
265be2d0 PR |
1318 | int w_restart_disk_io(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
1319 | { | |
1320 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
1321 | ||
0778286a | 1322 | if (bio_data_dir(req->master_bio) == WRITE && req->rq_state & RQ_IN_ACT_LOG) |
265be2d0 PR |
1323 | drbd_al_begin_io(mdev, req->sector); |
1324 | /* Calling drbd_al_begin_io() out of the worker might deadlocks | |
1325 | theoretically. Practically it can not deadlock, since this is | |
1326 | only used when unfreezing IOs. All the extents of the requests | |
1327 | that made it into the TL are already active */ | |
1328 | ||
1329 | drbd_req_make_private_bio(req, req->master_bio); | |
1330 | req->private_bio->bi_bdev = mdev->ldev->backing_bdev; | |
1331 | generic_make_request(req->private_bio); | |
1332 | ||
1333 | return 1; | |
1334 | } | |
1335 | ||
b411b363 PR |
1336 | static int _drbd_may_sync_now(struct drbd_conf *mdev) |
1337 | { | |
1338 | struct drbd_conf *odev = mdev; | |
1339 | ||
1340 | while (1) { | |
1341 | if (odev->sync_conf.after == -1) | |
1342 | return 1; | |
1343 | odev = minor_to_mdev(odev->sync_conf.after); | |
1344 | ERR_IF(!odev) return 1; | |
1345 | if ((odev->state.conn >= C_SYNC_SOURCE && | |
1346 | odev->state.conn <= C_PAUSED_SYNC_T) || | |
1347 | odev->state.aftr_isp || odev->state.peer_isp || | |
1348 | odev->state.user_isp) | |
1349 | return 0; | |
1350 | } | |
1351 | } | |
1352 | ||
1353 | /** | |
1354 | * _drbd_pause_after() - Pause resync on all devices that may not resync now | |
1355 | * @mdev: DRBD device. | |
1356 | * | |
1357 | * Called from process context only (admin command and after_state_ch). | |
1358 | */ | |
1359 | static int _drbd_pause_after(struct drbd_conf *mdev) | |
1360 | { | |
1361 | struct drbd_conf *odev; | |
1362 | int i, rv = 0; | |
1363 | ||
1364 | for (i = 0; i < minor_count; i++) { | |
1365 | odev = minor_to_mdev(i); | |
1366 | if (!odev) | |
1367 | continue; | |
1368 | if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS) | |
1369 | continue; | |
1370 | if (!_drbd_may_sync_now(odev)) | |
1371 | rv |= (__drbd_set_state(_NS(odev, aftr_isp, 1), CS_HARD, NULL) | |
1372 | != SS_NOTHING_TO_DO); | |
1373 | } | |
1374 | ||
1375 | return rv; | |
1376 | } | |
1377 | ||
1378 | /** | |
1379 | * _drbd_resume_next() - Resume resync on all devices that may resync now | |
1380 | * @mdev: DRBD device. | |
1381 | * | |
1382 | * Called from process context only (admin command and worker). | |
1383 | */ | |
1384 | static int _drbd_resume_next(struct drbd_conf *mdev) | |
1385 | { | |
1386 | struct drbd_conf *odev; | |
1387 | int i, rv = 0; | |
1388 | ||
1389 | for (i = 0; i < minor_count; i++) { | |
1390 | odev = minor_to_mdev(i); | |
1391 | if (!odev) | |
1392 | continue; | |
1393 | if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS) | |
1394 | continue; | |
1395 | if (odev->state.aftr_isp) { | |
1396 | if (_drbd_may_sync_now(odev)) | |
1397 | rv |= (__drbd_set_state(_NS(odev, aftr_isp, 0), | |
1398 | CS_HARD, NULL) | |
1399 | != SS_NOTHING_TO_DO) ; | |
1400 | } | |
1401 | } | |
1402 | return rv; | |
1403 | } | |
1404 | ||
1405 | void resume_next_sg(struct drbd_conf *mdev) | |
1406 | { | |
1407 | write_lock_irq(&global_state_lock); | |
1408 | _drbd_resume_next(mdev); | |
1409 | write_unlock_irq(&global_state_lock); | |
1410 | } | |
1411 | ||
1412 | void suspend_other_sg(struct drbd_conf *mdev) | |
1413 | { | |
1414 | write_lock_irq(&global_state_lock); | |
1415 | _drbd_pause_after(mdev); | |
1416 | write_unlock_irq(&global_state_lock); | |
1417 | } | |
1418 | ||
1419 | static int sync_after_error(struct drbd_conf *mdev, int o_minor) | |
1420 | { | |
1421 | struct drbd_conf *odev; | |
1422 | ||
1423 | if (o_minor == -1) | |
1424 | return NO_ERROR; | |
1425 | if (o_minor < -1 || minor_to_mdev(o_minor) == NULL) | |
1426 | return ERR_SYNC_AFTER; | |
1427 | ||
1428 | /* check for loops */ | |
1429 | odev = minor_to_mdev(o_minor); | |
1430 | while (1) { | |
1431 | if (odev == mdev) | |
1432 | return ERR_SYNC_AFTER_CYCLE; | |
1433 | ||
1434 | /* dependency chain ends here, no cycles. */ | |
1435 | if (odev->sync_conf.after == -1) | |
1436 | return NO_ERROR; | |
1437 | ||
1438 | /* follow the dependency chain */ | |
1439 | odev = minor_to_mdev(odev->sync_conf.after); | |
1440 | } | |
1441 | } | |
1442 | ||
1443 | int drbd_alter_sa(struct drbd_conf *mdev, int na) | |
1444 | { | |
1445 | int changes; | |
1446 | int retcode; | |
1447 | ||
1448 | write_lock_irq(&global_state_lock); | |
1449 | retcode = sync_after_error(mdev, na); | |
1450 | if (retcode == NO_ERROR) { | |
1451 | mdev->sync_conf.after = na; | |
1452 | do { | |
1453 | changes = _drbd_pause_after(mdev); | |
1454 | changes |= _drbd_resume_next(mdev); | |
1455 | } while (changes); | |
1456 | } | |
1457 | write_unlock_irq(&global_state_lock); | |
1458 | return retcode; | |
1459 | } | |
1460 | ||
9bd28d3c LE |
1461 | void drbd_rs_controller_reset(struct drbd_conf *mdev) |
1462 | { | |
1463 | atomic_set(&mdev->rs_sect_in, 0); | |
1464 | atomic_set(&mdev->rs_sect_ev, 0); | |
1465 | mdev->rs_in_flight = 0; | |
1466 | mdev->rs_planed = 0; | |
1467 | spin_lock(&mdev->peer_seq_lock); | |
1468 | fifo_set(&mdev->rs_plan_s, 0); | |
1469 | spin_unlock(&mdev->peer_seq_lock); | |
1470 | } | |
1471 | ||
b411b363 PR |
1472 | /** |
1473 | * drbd_start_resync() - Start the resync process | |
1474 | * @mdev: DRBD device. | |
1475 | * @side: Either C_SYNC_SOURCE or C_SYNC_TARGET | |
1476 | * | |
1477 | * This function might bring you directly into one of the | |
1478 | * C_PAUSED_SYNC_* states. | |
1479 | */ | |
1480 | void drbd_start_resync(struct drbd_conf *mdev, enum drbd_conns side) | |
1481 | { | |
1482 | union drbd_state ns; | |
1483 | int r; | |
1484 | ||
c4752ef1 | 1485 | if (mdev->state.conn >= C_SYNC_SOURCE && mdev->state.conn < C_AHEAD) { |
b411b363 PR |
1486 | dev_err(DEV, "Resync already running!\n"); |
1487 | return; | |
1488 | } | |
1489 | ||
59817f4f PR |
1490 | if (mdev->state.conn < C_AHEAD) { |
1491 | /* In case a previous resync run was aborted by an IO error/detach on the peer. */ | |
1492 | drbd_rs_cancel_all(mdev); | |
1493 | /* This should be done when we abort the resync. We definitely do not | |
1494 | want to have this for connections going back and forth between | |
1495 | Ahead/Behind and SyncSource/SyncTarget */ | |
1496 | } | |
b411b363 PR |
1497 | |
1498 | if (side == C_SYNC_TARGET) { | |
1499 | /* Since application IO was locked out during C_WF_BITMAP_T and | |
1500 | C_WF_SYNC_UUID we are still unmodified. Before going to C_SYNC_TARGET | |
1501 | we check that we might make the data inconsistent. */ | |
1502 | r = drbd_khelper(mdev, "before-resync-target"); | |
1503 | r = (r >> 8) & 0xff; | |
1504 | if (r > 0) { | |
1505 | dev_info(DEV, "before-resync-target handler returned %d, " | |
1506 | "dropping connection.\n", r); | |
1507 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
1508 | return; | |
1509 | } | |
09b9e797 PR |
1510 | } else /* C_SYNC_SOURCE */ { |
1511 | r = drbd_khelper(mdev, "before-resync-source"); | |
1512 | r = (r >> 8) & 0xff; | |
1513 | if (r > 0) { | |
1514 | if (r == 3) { | |
1515 | dev_info(DEV, "before-resync-source handler returned %d, " | |
1516 | "ignoring. Old userland tools?", r); | |
1517 | } else { | |
1518 | dev_info(DEV, "before-resync-source handler returned %d, " | |
1519 | "dropping connection.\n", r); | |
1520 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
1521 | return; | |
1522 | } | |
1523 | } | |
b411b363 PR |
1524 | } |
1525 | ||
1526 | drbd_state_lock(mdev); | |
1527 | ||
1528 | if (!get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
1529 | drbd_state_unlock(mdev); | |
1530 | return; | |
1531 | } | |
1532 | ||
b411b363 PR |
1533 | write_lock_irq(&global_state_lock); |
1534 | ns = mdev->state; | |
1535 | ||
1536 | ns.aftr_isp = !_drbd_may_sync_now(mdev); | |
1537 | ||
1538 | ns.conn = side; | |
1539 | ||
1540 | if (side == C_SYNC_TARGET) | |
1541 | ns.disk = D_INCONSISTENT; | |
1542 | else /* side == C_SYNC_SOURCE */ | |
1543 | ns.pdsk = D_INCONSISTENT; | |
1544 | ||
1545 | r = __drbd_set_state(mdev, ns, CS_VERBOSE, NULL); | |
1546 | ns = mdev->state; | |
1547 | ||
1548 | if (ns.conn < C_CONNECTED) | |
1549 | r = SS_UNKNOWN_ERROR; | |
1550 | ||
1551 | if (r == SS_SUCCESS) { | |
1d7734a0 LE |
1552 | unsigned long tw = drbd_bm_total_weight(mdev); |
1553 | unsigned long now = jiffies; | |
1554 | int i; | |
1555 | ||
b411b363 PR |
1556 | mdev->rs_failed = 0; |
1557 | mdev->rs_paused = 0; | |
b411b363 | 1558 | mdev->rs_same_csum = 0; |
0f0601f4 LE |
1559 | mdev->rs_last_events = 0; |
1560 | mdev->rs_last_sect_ev = 0; | |
1d7734a0 LE |
1561 | mdev->rs_total = tw; |
1562 | mdev->rs_start = now; | |
1563 | for (i = 0; i < DRBD_SYNC_MARKS; i++) { | |
1564 | mdev->rs_mark_left[i] = tw; | |
1565 | mdev->rs_mark_time[i] = now; | |
1566 | } | |
b411b363 PR |
1567 | _drbd_pause_after(mdev); |
1568 | } | |
1569 | write_unlock_irq(&global_state_lock); | |
5a22db89 | 1570 | |
b411b363 PR |
1571 | if (r == SS_SUCCESS) { |
1572 | dev_info(DEV, "Began resync as %s (will sync %lu KB [%lu bits set]).\n", | |
1573 | drbd_conn_str(ns.conn), | |
1574 | (unsigned long) mdev->rs_total << (BM_BLOCK_SHIFT-10), | |
1575 | (unsigned long) mdev->rs_total); | |
6c922ed5 LE |
1576 | if (side == C_SYNC_TARGET) |
1577 | mdev->bm_resync_fo = 0; | |
1578 | ||
1579 | /* Since protocol 96, we must serialize drbd_gen_and_send_sync_uuid | |
1580 | * with w_send_oos, or the sync target will get confused as to | |
1581 | * how much bits to resync. We cannot do that always, because for an | |
1582 | * empty resync and protocol < 95, we need to do it here, as we call | |
1583 | * drbd_resync_finished from here in that case. | |
1584 | * We drbd_gen_and_send_sync_uuid here for protocol < 96, | |
1585 | * and from after_state_ch otherwise. */ | |
1586 | if (side == C_SYNC_SOURCE && mdev->agreed_pro_version < 96) | |
1587 | drbd_gen_and_send_sync_uuid(mdev); | |
b411b363 | 1588 | |
af85e8e8 LE |
1589 | if (mdev->agreed_pro_version < 95 && mdev->rs_total == 0) { |
1590 | /* This still has a race (about when exactly the peers | |
1591 | * detect connection loss) that can lead to a full sync | |
1592 | * on next handshake. In 8.3.9 we fixed this with explicit | |
1593 | * resync-finished notifications, but the fix | |
1594 | * introduces a protocol change. Sleeping for some | |
1595 | * time longer than the ping interval + timeout on the | |
1596 | * SyncSource, to give the SyncTarget the chance to | |
1597 | * detect connection loss, then waiting for a ping | |
1598 | * response (implicit in drbd_resync_finished) reduces | |
1599 | * the race considerably, but does not solve it. */ | |
1600 | if (side == C_SYNC_SOURCE) | |
1601 | schedule_timeout_interruptible( | |
1602 | mdev->net_conf->ping_int * HZ + | |
1603 | mdev->net_conf->ping_timeo*HZ/9); | |
b411b363 | 1604 | drbd_resync_finished(mdev); |
b411b363 PR |
1605 | } |
1606 | ||
9bd28d3c | 1607 | drbd_rs_controller_reset(mdev); |
b411b363 PR |
1608 | /* ns.conn may already be != mdev->state.conn, |
1609 | * we may have been paused in between, or become paused until | |
1610 | * the timer triggers. | |
1611 | * No matter, that is handled in resync_timer_fn() */ | |
1612 | if (ns.conn == C_SYNC_TARGET) | |
1613 | mod_timer(&mdev->resync_timer, jiffies); | |
1614 | ||
1615 | drbd_md_sync(mdev); | |
1616 | } | |
5a22db89 | 1617 | put_ldev(mdev); |
d0c3f60f | 1618 | drbd_state_unlock(mdev); |
b411b363 PR |
1619 | } |
1620 | ||
1621 | int drbd_worker(struct drbd_thread *thi) | |
1622 | { | |
1623 | struct drbd_conf *mdev = thi->mdev; | |
1624 | struct drbd_work *w = NULL; | |
1625 | LIST_HEAD(work_list); | |
1626 | int intr = 0, i; | |
1627 | ||
1628 | sprintf(current->comm, "drbd%d_worker", mdev_to_minor(mdev)); | |
1629 | ||
1630 | while (get_t_state(thi) == Running) { | |
1631 | drbd_thread_current_set_cpu(mdev); | |
1632 | ||
1633 | if (down_trylock(&mdev->data.work.s)) { | |
1634 | mutex_lock(&mdev->data.mutex); | |
1635 | if (mdev->data.socket && !mdev->net_conf->no_cork) | |
1636 | drbd_tcp_uncork(mdev->data.socket); | |
1637 | mutex_unlock(&mdev->data.mutex); | |
1638 | ||
1639 | intr = down_interruptible(&mdev->data.work.s); | |
1640 | ||
1641 | mutex_lock(&mdev->data.mutex); | |
1642 | if (mdev->data.socket && !mdev->net_conf->no_cork) | |
1643 | drbd_tcp_cork(mdev->data.socket); | |
1644 | mutex_unlock(&mdev->data.mutex); | |
1645 | } | |
1646 | ||
1647 | if (intr) { | |
1648 | D_ASSERT(intr == -EINTR); | |
1649 | flush_signals(current); | |
1650 | ERR_IF (get_t_state(thi) == Running) | |
1651 | continue; | |
1652 | break; | |
1653 | } | |
1654 | ||
1655 | if (get_t_state(thi) != Running) | |
1656 | break; | |
1657 | /* With this break, we have done a down() but not consumed | |
1658 | the entry from the list. The cleanup code takes care of | |
1659 | this... */ | |
1660 | ||
1661 | w = NULL; | |
1662 | spin_lock_irq(&mdev->data.work.q_lock); | |
1663 | ERR_IF(list_empty(&mdev->data.work.q)) { | |
1664 | /* something terribly wrong in our logic. | |
1665 | * we were able to down() the semaphore, | |
1666 | * but the list is empty... doh. | |
1667 | * | |
1668 | * what is the best thing to do now? | |
1669 | * try again from scratch, restarting the receiver, | |
1670 | * asender, whatnot? could break even more ugly, | |
1671 | * e.g. when we are primary, but no good local data. | |
1672 | * | |
1673 | * I'll try to get away just starting over this loop. | |
1674 | */ | |
1675 | spin_unlock_irq(&mdev->data.work.q_lock); | |
1676 | continue; | |
1677 | } | |
1678 | w = list_entry(mdev->data.work.q.next, struct drbd_work, list); | |
1679 | list_del_init(&w->list); | |
1680 | spin_unlock_irq(&mdev->data.work.q_lock); | |
1681 | ||
1682 | if (!w->cb(mdev, w, mdev->state.conn < C_CONNECTED)) { | |
1683 | /* dev_warn(DEV, "worker: a callback failed! \n"); */ | |
1684 | if (mdev->state.conn >= C_CONNECTED) | |
1685 | drbd_force_state(mdev, | |
1686 | NS(conn, C_NETWORK_FAILURE)); | |
1687 | } | |
1688 | } | |
1689 | D_ASSERT(test_bit(DEVICE_DYING, &mdev->flags)); | |
1690 | D_ASSERT(test_bit(CONFIG_PENDING, &mdev->flags)); | |
1691 | ||
1692 | spin_lock_irq(&mdev->data.work.q_lock); | |
1693 | i = 0; | |
1694 | while (!list_empty(&mdev->data.work.q)) { | |
1695 | list_splice_init(&mdev->data.work.q, &work_list); | |
1696 | spin_unlock_irq(&mdev->data.work.q_lock); | |
1697 | ||
1698 | while (!list_empty(&work_list)) { | |
1699 | w = list_entry(work_list.next, struct drbd_work, list); | |
1700 | list_del_init(&w->list); | |
1701 | w->cb(mdev, w, 1); | |
1702 | i++; /* dead debugging code */ | |
1703 | } | |
1704 | ||
1705 | spin_lock_irq(&mdev->data.work.q_lock); | |
1706 | } | |
1707 | sema_init(&mdev->data.work.s, 0); | |
1708 | /* DANGEROUS race: if someone did queue his work within the spinlock, | |
1709 | * but up() ed outside the spinlock, we could get an up() on the | |
1710 | * semaphore without corresponding list entry. | |
1711 | * So don't do that. | |
1712 | */ | |
1713 | spin_unlock_irq(&mdev->data.work.q_lock); | |
1714 | ||
1715 | D_ASSERT(mdev->state.disk == D_DISKLESS && mdev->state.conn == C_STANDALONE); | |
1716 | /* _drbd_set_state only uses stop_nowait. | |
1717 | * wait here for the Exiting receiver. */ | |
1718 | drbd_thread_stop(&mdev->receiver); | |
1719 | drbd_mdev_cleanup(mdev); | |
1720 | ||
1721 | dev_info(DEV, "worker terminated\n"); | |
1722 | ||
1723 | clear_bit(DEVICE_DYING, &mdev->flags); | |
1724 | clear_bit(CONFIG_PENDING, &mdev->flags); | |
1725 | wake_up(&mdev->state_wait); | |
1726 | ||
1727 | return 0; | |
1728 | } |