Commit | Line | Data |
---|---|---|
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 | 87 | |
b411b363 | 88 | spin_lock_irqsave(&mdev->req_lock, flags); |
010f6e67 | 89 | mdev->read_cnt += e->i.size >> 9; |
b411b363 PR |
90 | list_del(&e->w.list); |
91 | if (list_empty(&mdev->read_ee)) | |
92 | wake_up(&mdev->ee_wait); | |
45bb912b | 93 | if (test_bit(__EE_WAS_ERROR, &e->flags)) |
81e84650 | 94 | __drbd_chk_io_error(mdev, false); |
b411b363 PR |
95 | spin_unlock_irqrestore(&mdev->req_lock, flags); |
96 | ||
e42325a5 | 97 | drbd_queue_work(&mdev->tconn->data.work, &e->w); |
b411b363 | 98 | put_ldev(mdev); |
b411b363 PR |
99 | } |
100 | ||
101 | /* writes on behalf of the partner, or resync writes, | |
45bb912b LE |
102 | * "submitted" by the receiver, final stage. */ |
103 | static void drbd_endio_write_sec_final(struct drbd_epoch_entry *e) __releases(local) | |
b411b363 PR |
104 | { |
105 | unsigned long flags = 0; | |
45bb912b | 106 | struct drbd_conf *mdev = e->mdev; |
b411b363 PR |
107 | sector_t e_sector; |
108 | int do_wake; | |
579b57ed | 109 | u64 block_id; |
b411b363 | 110 | int do_al_complete_io; |
b411b363 | 111 | |
b411b363 PR |
112 | /* after we moved e to done_ee, |
113 | * we may no longer access it, | |
114 | * it may be freed/reused already! | |
115 | * (as soon as we release the req_lock) */ | |
010f6e67 | 116 | e_sector = e->i.sector; |
b411b363 | 117 | do_al_complete_io = e->flags & EE_CALL_AL_COMPLETE_IO; |
579b57ed | 118 | block_id = e->block_id; |
b411b363 | 119 | |
45bb912b | 120 | spin_lock_irqsave(&mdev->req_lock, flags); |
010f6e67 | 121 | mdev->writ_cnt += e->i.size >> 9; |
b411b363 PR |
122 | list_del(&e->w.list); /* has been on active_ee or sync_ee */ |
123 | list_add_tail(&e->w.list, &mdev->done_ee); | |
124 | ||
bb3bfe96 AG |
125 | /* |
126 | * Do not remove from the epoch_entries tree here: we did not send the | |
127 | * Ack yet and did not wake possibly waiting conflicting requests. | |
128 | * Removed from the tree from "drbd_process_done_ee" within the | |
129 | * appropriate w.cb (e_end_block/e_end_resync_block) or from | |
130 | * _drbd_clear_done_ee. | |
131 | */ | |
b411b363 | 132 | |
579b57ed | 133 | do_wake = list_empty(block_id == ID_SYNCER ? &mdev->sync_ee : &mdev->active_ee); |
b411b363 | 134 | |
45bb912b | 135 | if (test_bit(__EE_WAS_ERROR, &e->flags)) |
81e84650 | 136 | __drbd_chk_io_error(mdev, false); |
b411b363 PR |
137 | spin_unlock_irqrestore(&mdev->req_lock, flags); |
138 | ||
579b57ed | 139 | if (block_id == ID_SYNCER) |
b411b363 PR |
140 | drbd_rs_complete_io(mdev, e_sector); |
141 | ||
142 | if (do_wake) | |
143 | wake_up(&mdev->ee_wait); | |
144 | ||
145 | if (do_al_complete_io) | |
146 | drbd_al_complete_io(mdev, e_sector); | |
147 | ||
148 | wake_asender(mdev); | |
149 | put_ldev(mdev); | |
45bb912b | 150 | } |
b411b363 | 151 | |
45bb912b LE |
152 | /* writes on behalf of the partner, or resync writes, |
153 | * "submitted" by the receiver. | |
154 | */ | |
155 | void drbd_endio_sec(struct bio *bio, int error) | |
156 | { | |
157 | struct drbd_epoch_entry *e = bio->bi_private; | |
158 | struct drbd_conf *mdev = e->mdev; | |
159 | int uptodate = bio_flagged(bio, BIO_UPTODATE); | |
160 | int is_write = bio_data_dir(bio) == WRITE; | |
161 | ||
07194272 | 162 | if (error && __ratelimit(&drbd_ratelimit_state)) |
45bb912b LE |
163 | dev_warn(DEV, "%s: error=%d s=%llus\n", |
164 | is_write ? "write" : "read", error, | |
010f6e67 | 165 | (unsigned long long)e->i.sector); |
45bb912b | 166 | if (!error && !uptodate) { |
07194272 LE |
167 | if (__ratelimit(&drbd_ratelimit_state)) |
168 | dev_warn(DEV, "%s: setting error to -EIO s=%llus\n", | |
169 | is_write ? "write" : "read", | |
010f6e67 | 170 | (unsigned long long)e->i.sector); |
45bb912b LE |
171 | /* strange behavior of some lower level drivers... |
172 | * fail the request by clearing the uptodate flag, | |
173 | * but do not return any error?! */ | |
174 | error = -EIO; | |
175 | } | |
176 | ||
177 | if (error) | |
178 | set_bit(__EE_WAS_ERROR, &e->flags); | |
179 | ||
180 | bio_put(bio); /* no need for the bio anymore */ | |
181 | if (atomic_dec_and_test(&e->pending_bios)) { | |
182 | if (is_write) | |
183 | drbd_endio_write_sec_final(e); | |
184 | else | |
185 | drbd_endio_read_sec_final(e); | |
186 | } | |
b411b363 PR |
187 | } |
188 | ||
189 | /* read, readA or write requests on R_PRIMARY coming from drbd_make_request | |
190 | */ | |
191 | void drbd_endio_pri(struct bio *bio, int error) | |
192 | { | |
a115413d | 193 | unsigned long flags; |
b411b363 PR |
194 | struct drbd_request *req = bio->bi_private; |
195 | struct drbd_conf *mdev = req->mdev; | |
a115413d | 196 | struct bio_and_error m; |
b411b363 PR |
197 | enum drbd_req_event what; |
198 | int uptodate = bio_flagged(bio, BIO_UPTODATE); | |
199 | ||
b411b363 PR |
200 | if (!error && !uptodate) { |
201 | dev_warn(DEV, "p %s: setting error to -EIO\n", | |
202 | bio_data_dir(bio) == WRITE ? "write" : "read"); | |
203 | /* strange behavior of some lower level drivers... | |
204 | * fail the request by clearing the uptodate flag, | |
205 | * but do not return any error?! */ | |
206 | error = -EIO; | |
207 | } | |
208 | ||
b411b363 PR |
209 | /* to avoid recursion in __req_mod */ |
210 | if (unlikely(error)) { | |
211 | what = (bio_data_dir(bio) == WRITE) | |
8554df1c | 212 | ? WRITE_COMPLETED_WITH_ERROR |
5c3c7e64 | 213 | : (bio_rw(bio) == READ) |
8554df1c AG |
214 | ? READ_COMPLETED_WITH_ERROR |
215 | : READ_AHEAD_COMPLETED_WITH_ERROR; | |
b411b363 | 216 | } else |
8554df1c | 217 | what = COMPLETED_OK; |
b411b363 PR |
218 | |
219 | bio_put(req->private_bio); | |
220 | req->private_bio = ERR_PTR(error); | |
221 | ||
a115413d LE |
222 | /* not req_mod(), we need irqsave here! */ |
223 | spin_lock_irqsave(&mdev->req_lock, flags); | |
224 | __req_mod(req, what, &m); | |
225 | spin_unlock_irqrestore(&mdev->req_lock, flags); | |
226 | ||
227 | if (m.bio) | |
228 | complete_master_bio(mdev, &m); | |
b411b363 PR |
229 | } |
230 | ||
b411b363 PR |
231 | int w_read_retry_remote(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
232 | { | |
233 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
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 | ||
239 | spin_lock_irq(&mdev->req_lock); | |
d255e5ff | 240 | if (cancel || mdev->state.pdsk != D_UP_TO_DATE) { |
8554df1c | 241 | _req_mod(req, READ_RETRY_REMOTE_CANCELED); |
b411b363 | 242 | spin_unlock_irq(&mdev->req_lock); |
b411b363 PR |
243 | return 1; |
244 | } | |
245 | spin_unlock_irq(&mdev->req_lock); | |
246 | ||
247 | return w_send_read_req(mdev, w, 0); | |
248 | } | |
249 | ||
45bb912b LE |
250 | void drbd_csum_ee(struct drbd_conf *mdev, struct crypto_hash *tfm, struct drbd_epoch_entry *e, void *digest) |
251 | { | |
252 | struct hash_desc desc; | |
253 | struct scatterlist sg; | |
254 | struct page *page = e->pages; | |
255 | struct page *tmp; | |
256 | unsigned len; | |
257 | ||
258 | desc.tfm = tfm; | |
259 | desc.flags = 0; | |
260 | ||
261 | sg_init_table(&sg, 1); | |
262 | crypto_hash_init(&desc); | |
263 | ||
264 | while ((tmp = page_chain_next(page))) { | |
265 | /* all but the last page will be fully used */ | |
266 | sg_set_page(&sg, page, PAGE_SIZE, 0); | |
267 | crypto_hash_update(&desc, &sg, sg.length); | |
268 | page = tmp; | |
269 | } | |
270 | /* and now the last, possibly only partially used page */ | |
010f6e67 | 271 | len = e->i.size & (PAGE_SIZE - 1); |
45bb912b LE |
272 | sg_set_page(&sg, page, len ?: PAGE_SIZE, 0); |
273 | crypto_hash_update(&desc, &sg, sg.length); | |
274 | crypto_hash_final(&desc, digest); | |
275 | } | |
276 | ||
277 | void drbd_csum_bio(struct drbd_conf *mdev, struct crypto_hash *tfm, struct bio *bio, void *digest) | |
b411b363 PR |
278 | { |
279 | struct hash_desc desc; | |
280 | struct scatterlist sg; | |
281 | struct bio_vec *bvec; | |
282 | int i; | |
283 | ||
284 | desc.tfm = tfm; | |
285 | desc.flags = 0; | |
286 | ||
287 | sg_init_table(&sg, 1); | |
288 | crypto_hash_init(&desc); | |
289 | ||
290 | __bio_for_each_segment(bvec, bio, i, 0) { | |
291 | sg_set_page(&sg, bvec->bv_page, bvec->bv_len, bvec->bv_offset); | |
292 | crypto_hash_update(&desc, &sg, sg.length); | |
293 | } | |
294 | crypto_hash_final(&desc, digest); | |
295 | } | |
296 | ||
53ea4331 LE |
297 | /* TODO merge common code with w_e_end_ov_req */ |
298 | int w_e_send_csum(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
b411b363 PR |
299 | { |
300 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); | |
301 | int digest_size; | |
302 | void *digest; | |
53ea4331 | 303 | int ok = 1; |
b411b363 | 304 | |
53ea4331 LE |
305 | if (unlikely(cancel)) |
306 | goto out; | |
b411b363 | 307 | |
53ea4331 LE |
308 | if (likely((e->flags & EE_WAS_ERROR) != 0)) |
309 | goto out; | |
b411b363 | 310 | |
53ea4331 LE |
311 | digest_size = crypto_hash_digestsize(mdev->csums_tfm); |
312 | digest = kmalloc(digest_size, GFP_NOIO); | |
313 | if (digest) { | |
010f6e67 AG |
314 | sector_t sector = e->i.sector; |
315 | unsigned int size = e->i.size; | |
53ea4331 LE |
316 | drbd_csum_ee(mdev, mdev->csums_tfm, e, digest); |
317 | /* Free e and pages before send. | |
318 | * In case we block on congestion, we could otherwise run into | |
319 | * some distributed deadlock, if the other side blocks on | |
320 | * congestion as well, because our receiver blocks in | |
321 | * drbd_pp_alloc due to pp_in_use > max_buffers. */ | |
322 | drbd_free_ee(mdev, e); | |
323 | e = NULL; | |
324 | inc_rs_pending(mdev); | |
325 | ok = drbd_send_drequest_csum(mdev, sector, size, | |
326 | digest, digest_size, | |
327 | P_CSUM_RS_REQUEST); | |
328 | kfree(digest); | |
329 | } else { | |
330 | dev_err(DEV, "kmalloc() of digest failed.\n"); | |
331 | ok = 0; | |
332 | } | |
b411b363 | 333 | |
53ea4331 LE |
334 | out: |
335 | if (e) | |
336 | drbd_free_ee(mdev, e); | |
b411b363 PR |
337 | |
338 | if (unlikely(!ok)) | |
339 | dev_err(DEV, "drbd_send_drequest(..., csum) failed\n"); | |
340 | return ok; | |
341 | } | |
342 | ||
343 | #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) | |
344 | ||
345 | static int read_for_csum(struct drbd_conf *mdev, sector_t sector, int size) | |
346 | { | |
347 | struct drbd_epoch_entry *e; | |
348 | ||
349 | if (!get_ldev(mdev)) | |
80a40e43 | 350 | return -EIO; |
b411b363 | 351 | |
e3555d85 | 352 | if (drbd_rs_should_slow_down(mdev, sector)) |
0f0601f4 LE |
353 | goto defer; |
354 | ||
b411b363 PR |
355 | /* GFP_TRY, because if there is no memory available right now, this may |
356 | * be rescheduled for later. It is "only" background resync, after all. */ | |
9a8e7753 | 357 | e = drbd_alloc_ee(mdev, ID_SYNCER /* unused */, sector, size, GFP_TRY); |
45bb912b | 358 | if (!e) |
80a40e43 | 359 | goto defer; |
b411b363 | 360 | |
80a40e43 | 361 | e->w.cb = w_e_send_csum; |
b411b363 PR |
362 | spin_lock_irq(&mdev->req_lock); |
363 | list_add(&e->w.list, &mdev->read_ee); | |
364 | spin_unlock_irq(&mdev->req_lock); | |
365 | ||
0f0601f4 | 366 | atomic_add(size >> 9, &mdev->rs_sect_ev); |
45bb912b | 367 | if (drbd_submit_ee(mdev, e, READ, DRBD_FAULT_RS_RD) == 0) |
80a40e43 | 368 | return 0; |
b411b363 | 369 | |
10f6d992 LE |
370 | /* If it failed because of ENOMEM, retry should help. If it failed |
371 | * because bio_add_page failed (probably broken lower level driver), | |
372 | * retry may or may not help. | |
373 | * If it does not, you may need to force disconnect. */ | |
22cc37a9 LE |
374 | spin_lock_irq(&mdev->req_lock); |
375 | list_del(&e->w.list); | |
376 | spin_unlock_irq(&mdev->req_lock); | |
377 | ||
45bb912b | 378 | drbd_free_ee(mdev, e); |
80a40e43 | 379 | defer: |
45bb912b | 380 | put_ldev(mdev); |
80a40e43 | 381 | return -EAGAIN; |
b411b363 PR |
382 | } |
383 | ||
794abb75 | 384 | int w_resync_timer(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
b411b363 | 385 | { |
63106d3c PR |
386 | switch (mdev->state.conn) { |
387 | case C_VERIFY_S: | |
794abb75 | 388 | w_make_ov_request(mdev, w, cancel); |
63106d3c PR |
389 | break; |
390 | case C_SYNC_TARGET: | |
794abb75 | 391 | w_make_resync_request(mdev, w, cancel); |
63106d3c | 392 | break; |
b411b363 PR |
393 | } |
394 | ||
794abb75 PR |
395 | return 1; |
396 | } | |
397 | ||
398 | void resync_timer_fn(unsigned long data) | |
399 | { | |
400 | struct drbd_conf *mdev = (struct drbd_conf *) data; | |
401 | ||
402 | if (list_empty(&mdev->resync_work.list)) | |
e42325a5 | 403 | drbd_queue_work(&mdev->tconn->data.work, &mdev->resync_work); |
b411b363 PR |
404 | } |
405 | ||
778f271d PR |
406 | static void fifo_set(struct fifo_buffer *fb, int value) |
407 | { | |
408 | int i; | |
409 | ||
410 | for (i = 0; i < fb->size; i++) | |
f10f2623 | 411 | fb->values[i] = value; |
778f271d PR |
412 | } |
413 | ||
414 | static int fifo_push(struct fifo_buffer *fb, int value) | |
415 | { | |
416 | int ov; | |
417 | ||
418 | ov = fb->values[fb->head_index]; | |
419 | fb->values[fb->head_index++] = value; | |
420 | ||
421 | if (fb->head_index >= fb->size) | |
422 | fb->head_index = 0; | |
423 | ||
424 | return ov; | |
425 | } | |
426 | ||
427 | static void fifo_add_val(struct fifo_buffer *fb, int value) | |
428 | { | |
429 | int i; | |
430 | ||
431 | for (i = 0; i < fb->size; i++) | |
432 | fb->values[i] += value; | |
433 | } | |
434 | ||
9d77a5fe | 435 | static int drbd_rs_controller(struct drbd_conf *mdev) |
778f271d PR |
436 | { |
437 | unsigned int sect_in; /* Number of sectors that came in since the last turn */ | |
438 | unsigned int want; /* The number of sectors we want in the proxy */ | |
439 | int req_sect; /* Number of sectors to request in this turn */ | |
440 | int correction; /* Number of sectors more we need in the proxy*/ | |
441 | int cps; /* correction per invocation of drbd_rs_controller() */ | |
442 | int steps; /* Number of time steps to plan ahead */ | |
443 | int curr_corr; | |
444 | int max_sect; | |
445 | ||
446 | sect_in = atomic_xchg(&mdev->rs_sect_in, 0); /* Number of sectors that came in */ | |
447 | mdev->rs_in_flight -= sect_in; | |
448 | ||
449 | spin_lock(&mdev->peer_seq_lock); /* get an atomic view on mdev->rs_plan_s */ | |
450 | ||
451 | steps = mdev->rs_plan_s.size; /* (mdev->sync_conf.c_plan_ahead * 10 * SLEEP_TIME) / HZ; */ | |
452 | ||
453 | if (mdev->rs_in_flight + sect_in == 0) { /* At start of resync */ | |
454 | want = ((mdev->sync_conf.rate * 2 * SLEEP_TIME) / HZ) * steps; | |
455 | } else { /* normal path */ | |
456 | want = mdev->sync_conf.c_fill_target ? mdev->sync_conf.c_fill_target : | |
457 | sect_in * mdev->sync_conf.c_delay_target * HZ / (SLEEP_TIME * 10); | |
458 | } | |
459 | ||
460 | correction = want - mdev->rs_in_flight - mdev->rs_planed; | |
461 | ||
462 | /* Plan ahead */ | |
463 | cps = correction / steps; | |
464 | fifo_add_val(&mdev->rs_plan_s, cps); | |
465 | mdev->rs_planed += cps * steps; | |
466 | ||
467 | /* What we do in this step */ | |
468 | curr_corr = fifo_push(&mdev->rs_plan_s, 0); | |
469 | spin_unlock(&mdev->peer_seq_lock); | |
470 | mdev->rs_planed -= curr_corr; | |
471 | ||
472 | req_sect = sect_in + curr_corr; | |
473 | if (req_sect < 0) | |
474 | req_sect = 0; | |
475 | ||
476 | max_sect = (mdev->sync_conf.c_max_rate * 2 * SLEEP_TIME) / HZ; | |
477 | if (req_sect > max_sect) | |
478 | req_sect = max_sect; | |
479 | ||
480 | /* | |
481 | dev_warn(DEV, "si=%u if=%d wa=%u co=%d st=%d cps=%d pl=%d cc=%d rs=%d\n", | |
482 | sect_in, mdev->rs_in_flight, want, correction, | |
483 | steps, cps, mdev->rs_planed, curr_corr, req_sect); | |
484 | */ | |
485 | ||
486 | return req_sect; | |
487 | } | |
488 | ||
9d77a5fe | 489 | static int drbd_rs_number_requests(struct drbd_conf *mdev) |
e65f440d LE |
490 | { |
491 | int number; | |
492 | if (mdev->rs_plan_s.size) { /* mdev->sync_conf.c_plan_ahead */ | |
493 | number = drbd_rs_controller(mdev) >> (BM_BLOCK_SHIFT - 9); | |
494 | mdev->c_sync_rate = number * HZ * (BM_BLOCK_SIZE / 1024) / SLEEP_TIME; | |
495 | } else { | |
496 | mdev->c_sync_rate = mdev->sync_conf.rate; | |
497 | number = SLEEP_TIME * mdev->c_sync_rate / ((BM_BLOCK_SIZE / 1024) * HZ); | |
498 | } | |
499 | ||
e65f440d LE |
500 | /* ignore the amount of pending requests, the resync controller should |
501 | * throttle down to incoming reply rate soon enough anyways. */ | |
502 | return number; | |
503 | } | |
504 | ||
9d77a5fe PR |
505 | static int w_make_resync_request(struct drbd_conf *mdev, |
506 | struct drbd_work *w, int cancel) | |
b411b363 PR |
507 | { |
508 | unsigned long bit; | |
509 | sector_t sector; | |
510 | const sector_t capacity = drbd_get_capacity(mdev->this_bdev); | |
1816a2b4 | 511 | int max_bio_size; |
e65f440d | 512 | int number, rollback_i, size; |
b411b363 | 513 | int align, queued, sndbuf; |
0f0601f4 | 514 | int i = 0; |
b411b363 PR |
515 | |
516 | if (unlikely(cancel)) | |
517 | return 1; | |
518 | ||
af85e8e8 LE |
519 | if (mdev->rs_total == 0) { |
520 | /* empty resync? */ | |
521 | drbd_resync_finished(mdev); | |
522 | return 1; | |
523 | } | |
524 | ||
b411b363 PR |
525 | if (!get_ldev(mdev)) { |
526 | /* Since we only need to access mdev->rsync a | |
527 | get_ldev_if_state(mdev,D_FAILED) would be sufficient, but | |
528 | to continue resync with a broken disk makes no sense at | |
529 | all */ | |
530 | dev_err(DEV, "Disk broke down during resync!\n"); | |
b411b363 PR |
531 | return 1; |
532 | } | |
533 | ||
0cfdd247 | 534 | max_bio_size = queue_max_hw_sectors(mdev->rq_queue) << 9; |
e65f440d LE |
535 | number = drbd_rs_number_requests(mdev); |
536 | if (number == 0) | |
0f0601f4 | 537 | goto requeue; |
b411b363 | 538 | |
b411b363 PR |
539 | for (i = 0; i < number; i++) { |
540 | /* Stop generating RS requests, when half of the send buffer is filled */ | |
e42325a5 PR |
541 | mutex_lock(&mdev->tconn->data.mutex); |
542 | if (mdev->tconn->data.socket) { | |
543 | queued = mdev->tconn->data.socket->sk->sk_wmem_queued; | |
544 | sndbuf = mdev->tconn->data.socket->sk->sk_sndbuf; | |
b411b363 PR |
545 | } else { |
546 | queued = 1; | |
547 | sndbuf = 0; | |
548 | } | |
e42325a5 | 549 | mutex_unlock(&mdev->tconn->data.mutex); |
b411b363 PR |
550 | if (queued > sndbuf / 2) |
551 | goto requeue; | |
552 | ||
553 | next_sector: | |
554 | size = BM_BLOCK_SIZE; | |
555 | bit = drbd_bm_find_next(mdev, mdev->bm_resync_fo); | |
556 | ||
4b0715f0 | 557 | if (bit == DRBD_END_OF_BITMAP) { |
b411b363 | 558 | mdev->bm_resync_fo = drbd_bm_bits(mdev); |
b411b363 PR |
559 | put_ldev(mdev); |
560 | return 1; | |
561 | } | |
562 | ||
563 | sector = BM_BIT_TO_SECT(bit); | |
564 | ||
e3555d85 PR |
565 | if (drbd_rs_should_slow_down(mdev, sector) || |
566 | drbd_try_rs_begin_io(mdev, sector)) { | |
b411b363 PR |
567 | mdev->bm_resync_fo = bit; |
568 | goto requeue; | |
569 | } | |
570 | mdev->bm_resync_fo = bit + 1; | |
571 | ||
572 | if (unlikely(drbd_bm_test_bit(mdev, bit) == 0)) { | |
573 | drbd_rs_complete_io(mdev, sector); | |
574 | goto next_sector; | |
575 | } | |
576 | ||
1816a2b4 | 577 | #if DRBD_MAX_BIO_SIZE > BM_BLOCK_SIZE |
b411b363 PR |
578 | /* try to find some adjacent bits. |
579 | * we stop if we have already the maximum req size. | |
580 | * | |
581 | * Additionally always align bigger requests, in order to | |
582 | * be prepared for all stripe sizes of software RAIDs. | |
b411b363 PR |
583 | */ |
584 | align = 1; | |
d207450c | 585 | rollback_i = i; |
b411b363 | 586 | for (;;) { |
1816a2b4 | 587 | if (size + BM_BLOCK_SIZE > max_bio_size) |
b411b363 PR |
588 | break; |
589 | ||
590 | /* Be always aligned */ | |
591 | if (sector & ((1<<(align+3))-1)) | |
592 | break; | |
593 | ||
594 | /* do not cross extent boundaries */ | |
595 | if (((bit+1) & BM_BLOCKS_PER_BM_EXT_MASK) == 0) | |
596 | break; | |
597 | /* now, is it actually dirty, after all? | |
598 | * caution, drbd_bm_test_bit is tri-state for some | |
599 | * obscure reason; ( b == 0 ) would get the out-of-band | |
600 | * only accidentally right because of the "oddly sized" | |
601 | * adjustment below */ | |
602 | if (drbd_bm_test_bit(mdev, bit+1) != 1) | |
603 | break; | |
604 | bit++; | |
605 | size += BM_BLOCK_SIZE; | |
606 | if ((BM_BLOCK_SIZE << align) <= size) | |
607 | align++; | |
608 | i++; | |
609 | } | |
610 | /* if we merged some, | |
611 | * reset the offset to start the next drbd_bm_find_next from */ | |
612 | if (size > BM_BLOCK_SIZE) | |
613 | mdev->bm_resync_fo = bit + 1; | |
614 | #endif | |
615 | ||
616 | /* adjust very last sectors, in case we are oddly sized */ | |
617 | if (sector + (size>>9) > capacity) | |
618 | size = (capacity-sector)<<9; | |
31890f4a | 619 | if (mdev->tconn->agreed_pro_version >= 89 && mdev->csums_tfm) { |
b411b363 | 620 | switch (read_for_csum(mdev, sector, size)) { |
80a40e43 | 621 | case -EIO: /* Disk failure */ |
b411b363 PR |
622 | put_ldev(mdev); |
623 | return 0; | |
80a40e43 | 624 | case -EAGAIN: /* allocation failed, or ldev busy */ |
b411b363 PR |
625 | drbd_rs_complete_io(mdev, sector); |
626 | mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); | |
d207450c | 627 | i = rollback_i; |
b411b363 | 628 | goto requeue; |
80a40e43 LE |
629 | case 0: |
630 | /* everything ok */ | |
631 | break; | |
632 | default: | |
633 | BUG(); | |
b411b363 PR |
634 | } |
635 | } else { | |
636 | inc_rs_pending(mdev); | |
637 | if (!drbd_send_drequest(mdev, P_RS_DATA_REQUEST, | |
638 | sector, size, ID_SYNCER)) { | |
639 | dev_err(DEV, "drbd_send_drequest() failed, aborting...\n"); | |
640 | dec_rs_pending(mdev); | |
641 | put_ldev(mdev); | |
642 | return 0; | |
643 | } | |
644 | } | |
645 | } | |
646 | ||
647 | if (mdev->bm_resync_fo >= drbd_bm_bits(mdev)) { | |
648 | /* last syncer _request_ was sent, | |
649 | * but the P_RS_DATA_REPLY not yet received. sync will end (and | |
650 | * next sync group will resume), as soon as we receive the last | |
651 | * resync data block, and the last bit is cleared. | |
652 | * until then resync "work" is "inactive" ... | |
653 | */ | |
b411b363 PR |
654 | put_ldev(mdev); |
655 | return 1; | |
656 | } | |
657 | ||
658 | requeue: | |
778f271d | 659 | mdev->rs_in_flight += (i << (BM_BLOCK_SHIFT - 9)); |
b411b363 PR |
660 | mod_timer(&mdev->resync_timer, jiffies + SLEEP_TIME); |
661 | put_ldev(mdev); | |
662 | return 1; | |
663 | } | |
664 | ||
665 | static int w_make_ov_request(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
666 | { | |
667 | int number, i, size; | |
668 | sector_t sector; | |
669 | const sector_t capacity = drbd_get_capacity(mdev->this_bdev); | |
670 | ||
671 | if (unlikely(cancel)) | |
672 | return 1; | |
673 | ||
2649f080 | 674 | number = drbd_rs_number_requests(mdev); |
b411b363 PR |
675 | |
676 | sector = mdev->ov_position; | |
677 | for (i = 0; i < number; i++) { | |
678 | if (sector >= capacity) { | |
b411b363 PR |
679 | return 1; |
680 | } | |
681 | ||
682 | size = BM_BLOCK_SIZE; | |
683 | ||
e3555d85 PR |
684 | if (drbd_rs_should_slow_down(mdev, sector) || |
685 | drbd_try_rs_begin_io(mdev, sector)) { | |
b411b363 PR |
686 | mdev->ov_position = sector; |
687 | goto requeue; | |
688 | } | |
689 | ||
690 | if (sector + (size>>9) > capacity) | |
691 | size = (capacity-sector)<<9; | |
692 | ||
693 | inc_rs_pending(mdev); | |
694 | if (!drbd_send_ov_request(mdev, sector, size)) { | |
695 | dec_rs_pending(mdev); | |
696 | return 0; | |
697 | } | |
698 | sector += BM_SECT_PER_BIT; | |
699 | } | |
700 | mdev->ov_position = sector; | |
701 | ||
702 | requeue: | |
2649f080 | 703 | mdev->rs_in_flight += (i << (BM_BLOCK_SHIFT - 9)); |
b411b363 PR |
704 | mod_timer(&mdev->resync_timer, jiffies + SLEEP_TIME); |
705 | return 1; | |
706 | } | |
707 | ||
c4752ef1 | 708 | |
370a43e7 PR |
709 | void start_resync_timer_fn(unsigned long data) |
710 | { | |
711 | struct drbd_conf *mdev = (struct drbd_conf *) data; | |
712 | ||
e42325a5 | 713 | drbd_queue_work(&mdev->tconn->data.work, &mdev->start_resync_work); |
370a43e7 PR |
714 | } |
715 | ||
c4752ef1 PR |
716 | int w_start_resync(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
717 | { | |
370a43e7 PR |
718 | if (atomic_read(&mdev->unacked_cnt) || atomic_read(&mdev->rs_pending_cnt)) { |
719 | dev_warn(DEV, "w_start_resync later...\n"); | |
720 | mdev->start_resync_timer.expires = jiffies + HZ/10; | |
721 | add_timer(&mdev->start_resync_timer); | |
722 | return 1; | |
723 | } | |
c4752ef1 | 724 | |
370a43e7 PR |
725 | drbd_start_resync(mdev, C_SYNC_SOURCE); |
726 | clear_bit(AHEAD_TO_SYNC_SOURCE, &mdev->current_epoch->flags); | |
c4752ef1 PR |
727 | return 1; |
728 | } | |
729 | ||
b411b363 PR |
730 | int w_ov_finished(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
731 | { | |
732 | kfree(w); | |
733 | ov_oos_print(mdev); | |
734 | drbd_resync_finished(mdev); | |
735 | ||
736 | return 1; | |
737 | } | |
738 | ||
739 | static int w_resync_finished(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
740 | { | |
741 | kfree(w); | |
742 | ||
743 | drbd_resync_finished(mdev); | |
744 | ||
745 | return 1; | |
746 | } | |
747 | ||
af85e8e8 LE |
748 | static void ping_peer(struct drbd_conf *mdev) |
749 | { | |
750 | clear_bit(GOT_PING_ACK, &mdev->flags); | |
751 | request_ping(mdev); | |
752 | wait_event(mdev->misc_wait, | |
753 | test_bit(GOT_PING_ACK, &mdev->flags) || mdev->state.conn < C_CONNECTED); | |
754 | } | |
755 | ||
b411b363 PR |
756 | int drbd_resync_finished(struct drbd_conf *mdev) |
757 | { | |
758 | unsigned long db, dt, dbdt; | |
759 | unsigned long n_oos; | |
760 | union drbd_state os, ns; | |
761 | struct drbd_work *w; | |
762 | char *khelper_cmd = NULL; | |
26525618 | 763 | int verify_done = 0; |
b411b363 PR |
764 | |
765 | /* Remove all elements from the resync LRU. Since future actions | |
766 | * might set bits in the (main) bitmap, then the entries in the | |
767 | * resync LRU would be wrong. */ | |
768 | if (drbd_rs_del_all(mdev)) { | |
769 | /* In case this is not possible now, most probably because | |
770 | * there are P_RS_DATA_REPLY Packets lingering on the worker's | |
771 | * queue (or even the read operations for those packets | |
772 | * is not finished by now). Retry in 100ms. */ | |
773 | ||
20ee6390 | 774 | schedule_timeout_interruptible(HZ / 10); |
b411b363 PR |
775 | w = kmalloc(sizeof(struct drbd_work), GFP_ATOMIC); |
776 | if (w) { | |
777 | w->cb = w_resync_finished; | |
e42325a5 | 778 | drbd_queue_work(&mdev->tconn->data.work, w); |
b411b363 PR |
779 | return 1; |
780 | } | |
781 | dev_err(DEV, "Warn failed to drbd_rs_del_all() and to kmalloc(w).\n"); | |
782 | } | |
783 | ||
784 | dt = (jiffies - mdev->rs_start - mdev->rs_paused) / HZ; | |
785 | if (dt <= 0) | |
786 | dt = 1; | |
787 | db = mdev->rs_total; | |
788 | dbdt = Bit2KB(db/dt); | |
789 | mdev->rs_paused /= HZ; | |
790 | ||
791 | if (!get_ldev(mdev)) | |
792 | goto out; | |
793 | ||
af85e8e8 LE |
794 | ping_peer(mdev); |
795 | ||
b411b363 PR |
796 | spin_lock_irq(&mdev->req_lock); |
797 | os = mdev->state; | |
798 | ||
26525618 LE |
799 | verify_done = (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T); |
800 | ||
b411b363 PR |
801 | /* This protects us against multiple calls (that can happen in the presence |
802 | of application IO), and against connectivity loss just before we arrive here. */ | |
803 | if (os.conn <= C_CONNECTED) | |
804 | goto out_unlock; | |
805 | ||
806 | ns = os; | |
807 | ns.conn = C_CONNECTED; | |
808 | ||
809 | dev_info(DEV, "%s done (total %lu sec; paused %lu sec; %lu K/sec)\n", | |
26525618 | 810 | verify_done ? "Online verify " : "Resync", |
b411b363 PR |
811 | dt + mdev->rs_paused, mdev->rs_paused, dbdt); |
812 | ||
813 | n_oos = drbd_bm_total_weight(mdev); | |
814 | ||
815 | if (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) { | |
816 | if (n_oos) { | |
817 | dev_alert(DEV, "Online verify found %lu %dk block out of sync!\n", | |
818 | n_oos, Bit2KB(1)); | |
819 | khelper_cmd = "out-of-sync"; | |
820 | } | |
821 | } else { | |
822 | D_ASSERT((n_oos - mdev->rs_failed) == 0); | |
823 | ||
824 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) | |
825 | khelper_cmd = "after-resync-target"; | |
826 | ||
827 | if (mdev->csums_tfm && mdev->rs_total) { | |
828 | const unsigned long s = mdev->rs_same_csum; | |
829 | const unsigned long t = mdev->rs_total; | |
830 | const int ratio = | |
831 | (t == 0) ? 0 : | |
832 | (t < 100000) ? ((s*100)/t) : (s/(t/100)); | |
24c4830c | 833 | dev_info(DEV, "%u %% had equal checksums, eliminated: %luK; " |
b411b363 PR |
834 | "transferred %luK total %luK\n", |
835 | ratio, | |
836 | Bit2KB(mdev->rs_same_csum), | |
837 | Bit2KB(mdev->rs_total - mdev->rs_same_csum), | |
838 | Bit2KB(mdev->rs_total)); | |
839 | } | |
840 | } | |
841 | ||
842 | if (mdev->rs_failed) { | |
843 | dev_info(DEV, " %lu failed blocks\n", mdev->rs_failed); | |
844 | ||
845 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) { | |
846 | ns.disk = D_INCONSISTENT; | |
847 | ns.pdsk = D_UP_TO_DATE; | |
848 | } else { | |
849 | ns.disk = D_UP_TO_DATE; | |
850 | ns.pdsk = D_INCONSISTENT; | |
851 | } | |
852 | } else { | |
853 | ns.disk = D_UP_TO_DATE; | |
854 | ns.pdsk = D_UP_TO_DATE; | |
855 | ||
856 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) { | |
857 | if (mdev->p_uuid) { | |
858 | int i; | |
859 | for (i = UI_BITMAP ; i <= UI_HISTORY_END ; i++) | |
860 | _drbd_uuid_set(mdev, i, mdev->p_uuid[i]); | |
861 | drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_CURRENT]); | |
862 | _drbd_uuid_set(mdev, UI_CURRENT, mdev->p_uuid[UI_CURRENT]); | |
863 | } else { | |
864 | dev_err(DEV, "mdev->p_uuid is NULL! BUG\n"); | |
865 | } | |
866 | } | |
867 | ||
62b0da3a LE |
868 | if (!(os.conn == C_VERIFY_S || os.conn == C_VERIFY_T)) { |
869 | /* for verify runs, we don't update uuids here, | |
870 | * so there would be nothing to report. */ | |
871 | drbd_uuid_set_bm(mdev, 0UL); | |
872 | drbd_print_uuids(mdev, "updated UUIDs"); | |
873 | if (mdev->p_uuid) { | |
874 | /* Now the two UUID sets are equal, update what we | |
875 | * know of the peer. */ | |
876 | int i; | |
877 | for (i = UI_CURRENT ; i <= UI_HISTORY_END ; i++) | |
878 | mdev->p_uuid[i] = mdev->ldev->md.uuid[i]; | |
879 | } | |
b411b363 PR |
880 | } |
881 | } | |
882 | ||
883 | _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); | |
884 | out_unlock: | |
885 | spin_unlock_irq(&mdev->req_lock); | |
886 | put_ldev(mdev); | |
887 | out: | |
888 | mdev->rs_total = 0; | |
889 | mdev->rs_failed = 0; | |
890 | mdev->rs_paused = 0; | |
26525618 LE |
891 | if (verify_done) |
892 | mdev->ov_start_sector = 0; | |
b411b363 | 893 | |
13d42685 LE |
894 | drbd_md_sync(mdev); |
895 | ||
b411b363 PR |
896 | if (khelper_cmd) |
897 | drbd_khelper(mdev, khelper_cmd); | |
898 | ||
899 | return 1; | |
900 | } | |
901 | ||
902 | /* helper */ | |
903 | static void move_to_net_ee_or_free(struct drbd_conf *mdev, struct drbd_epoch_entry *e) | |
904 | { | |
45bb912b | 905 | if (drbd_ee_has_active_page(e)) { |
b411b363 | 906 | /* This might happen if sendpage() has not finished */ |
010f6e67 | 907 | int i = (e->i.size + PAGE_SIZE -1) >> PAGE_SHIFT; |
435f0740 LE |
908 | atomic_add(i, &mdev->pp_in_use_by_net); |
909 | atomic_sub(i, &mdev->pp_in_use); | |
b411b363 PR |
910 | spin_lock_irq(&mdev->req_lock); |
911 | list_add_tail(&e->w.list, &mdev->net_ee); | |
912 | spin_unlock_irq(&mdev->req_lock); | |
435f0740 | 913 | wake_up(&drbd_pp_wait); |
b411b363 PR |
914 | } else |
915 | drbd_free_ee(mdev, e); | |
916 | } | |
917 | ||
918 | /** | |
919 | * w_e_end_data_req() - Worker callback, to send a P_DATA_REPLY packet in response to a P_DATA_REQUEST | |
920 | * @mdev: DRBD device. | |
921 | * @w: work object. | |
922 | * @cancel: The connection will be closed anyways | |
923 | */ | |
924 | int w_e_end_data_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
925 | { | |
926 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); | |
927 | int ok; | |
928 | ||
929 | if (unlikely(cancel)) { | |
930 | drbd_free_ee(mdev, e); | |
931 | dec_unacked(mdev); | |
932 | return 1; | |
933 | } | |
934 | ||
45bb912b | 935 | if (likely((e->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
936 | ok = drbd_send_block(mdev, P_DATA_REPLY, e); |
937 | } else { | |
938 | if (__ratelimit(&drbd_ratelimit_state)) | |
939 | dev_err(DEV, "Sending NegDReply. sector=%llus.\n", | |
010f6e67 | 940 | (unsigned long long)e->i.sector); |
b411b363 PR |
941 | |
942 | ok = drbd_send_ack(mdev, P_NEG_DREPLY, e); | |
943 | } | |
944 | ||
945 | dec_unacked(mdev); | |
946 | ||
947 | move_to_net_ee_or_free(mdev, e); | |
948 | ||
949 | if (unlikely(!ok)) | |
950 | dev_err(DEV, "drbd_send_block() failed\n"); | |
951 | return ok; | |
952 | } | |
953 | ||
954 | /** | |
955 | * w_e_end_rsdata_req() - Worker callback to send a P_RS_DATA_REPLY packet in response to a P_RS_DATA_REQUESTRS | |
956 | * @mdev: DRBD device. | |
957 | * @w: work object. | |
958 | * @cancel: The connection will be closed anyways | |
959 | */ | |
960 | int w_e_end_rsdata_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
961 | { | |
962 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); | |
963 | int ok; | |
964 | ||
965 | if (unlikely(cancel)) { | |
966 | drbd_free_ee(mdev, e); | |
967 | dec_unacked(mdev); | |
968 | return 1; | |
969 | } | |
970 | ||
971 | if (get_ldev_if_state(mdev, D_FAILED)) { | |
010f6e67 | 972 | drbd_rs_complete_io(mdev, e->i.sector); |
b411b363 PR |
973 | put_ldev(mdev); |
974 | } | |
975 | ||
d612d309 PR |
976 | if (mdev->state.conn == C_AHEAD) { |
977 | ok = drbd_send_ack(mdev, P_RS_CANCEL, e); | |
978 | } else if (likely((e->flags & EE_WAS_ERROR) == 0)) { | |
b411b363 PR |
979 | if (likely(mdev->state.pdsk >= D_INCONSISTENT)) { |
980 | inc_rs_pending(mdev); | |
981 | ok = drbd_send_block(mdev, P_RS_DATA_REPLY, e); | |
982 | } else { | |
983 | if (__ratelimit(&drbd_ratelimit_state)) | |
984 | dev_err(DEV, "Not sending RSDataReply, " | |
985 | "partner DISKLESS!\n"); | |
986 | ok = 1; | |
987 | } | |
988 | } else { | |
989 | if (__ratelimit(&drbd_ratelimit_state)) | |
990 | dev_err(DEV, "Sending NegRSDReply. sector %llus.\n", | |
010f6e67 | 991 | (unsigned long long)e->i.sector); |
b411b363 PR |
992 | |
993 | ok = drbd_send_ack(mdev, P_NEG_RS_DREPLY, e); | |
994 | ||
995 | /* update resync data with failure */ | |
010f6e67 | 996 | drbd_rs_failed_io(mdev, e->i.sector, e->i.size); |
b411b363 PR |
997 | } |
998 | ||
999 | dec_unacked(mdev); | |
1000 | ||
1001 | move_to_net_ee_or_free(mdev, e); | |
1002 | ||
1003 | if (unlikely(!ok)) | |
1004 | dev_err(DEV, "drbd_send_block() failed\n"); | |
1005 | return ok; | |
1006 | } | |
1007 | ||
1008 | int w_e_end_csum_rs_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1009 | { | |
1010 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); | |
1011 | struct digest_info *di; | |
1012 | int digest_size; | |
1013 | void *digest = NULL; | |
1014 | int ok, eq = 0; | |
1015 | ||
1016 | if (unlikely(cancel)) { | |
1017 | drbd_free_ee(mdev, e); | |
1018 | dec_unacked(mdev); | |
1019 | return 1; | |
1020 | } | |
1021 | ||
1d53f09e | 1022 | if (get_ldev(mdev)) { |
010f6e67 | 1023 | drbd_rs_complete_io(mdev, e->i.sector); |
1d53f09e LE |
1024 | put_ldev(mdev); |
1025 | } | |
b411b363 | 1026 | |
85719573 | 1027 | di = e->digest; |
b411b363 | 1028 | |
45bb912b | 1029 | if (likely((e->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
1030 | /* quick hack to try to avoid a race against reconfiguration. |
1031 | * a real fix would be much more involved, | |
1032 | * introducing more locking mechanisms */ | |
1033 | if (mdev->csums_tfm) { | |
1034 | digest_size = crypto_hash_digestsize(mdev->csums_tfm); | |
1035 | D_ASSERT(digest_size == di->digest_size); | |
1036 | digest = kmalloc(digest_size, GFP_NOIO); | |
1037 | } | |
1038 | if (digest) { | |
45bb912b | 1039 | drbd_csum_ee(mdev, mdev->csums_tfm, e, digest); |
b411b363 PR |
1040 | eq = !memcmp(digest, di->digest, digest_size); |
1041 | kfree(digest); | |
1042 | } | |
1043 | ||
1044 | if (eq) { | |
010f6e67 | 1045 | drbd_set_in_sync(mdev, e->i.sector, e->i.size); |
676396d5 | 1046 | /* rs_same_csums unit is BM_BLOCK_SIZE */ |
010f6e67 | 1047 | mdev->rs_same_csum += e->i.size >> BM_BLOCK_SHIFT; |
b411b363 PR |
1048 | ok = drbd_send_ack(mdev, P_RS_IS_IN_SYNC, e); |
1049 | } else { | |
1050 | inc_rs_pending(mdev); | |
204bba99 PR |
1051 | e->block_id = ID_SYNCER; /* By setting block_id, digest pointer becomes invalid! */ |
1052 | e->flags &= ~EE_HAS_DIGEST; /* This e no longer has a digest pointer */ | |
1053 | kfree(di); | |
b411b363 PR |
1054 | ok = drbd_send_block(mdev, P_RS_DATA_REPLY, e); |
1055 | } | |
1056 | } else { | |
1057 | ok = drbd_send_ack(mdev, P_NEG_RS_DREPLY, e); | |
1058 | if (__ratelimit(&drbd_ratelimit_state)) | |
1059 | dev_err(DEV, "Sending NegDReply. I guess it gets messy.\n"); | |
1060 | } | |
1061 | ||
1062 | dec_unacked(mdev); | |
b411b363 PR |
1063 | move_to_net_ee_or_free(mdev, e); |
1064 | ||
1065 | if (unlikely(!ok)) | |
1066 | dev_err(DEV, "drbd_send_block/ack() failed\n"); | |
1067 | return ok; | |
1068 | } | |
1069 | ||
53ea4331 | 1070 | /* TODO merge common code with w_e_send_csum */ |
b411b363 PR |
1071 | int w_e_end_ov_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
1072 | { | |
1073 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); | |
010f6e67 AG |
1074 | sector_t sector = e->i.sector; |
1075 | unsigned int size = e->i.size; | |
b411b363 PR |
1076 | int digest_size; |
1077 | void *digest; | |
1078 | int ok = 1; | |
1079 | ||
1080 | if (unlikely(cancel)) | |
1081 | goto out; | |
1082 | ||
b411b363 | 1083 | digest_size = crypto_hash_digestsize(mdev->verify_tfm); |
b411b363 | 1084 | digest = kmalloc(digest_size, GFP_NOIO); |
8f21420e PR |
1085 | if (!digest) { |
1086 | ok = 0; /* terminate the connection in case the allocation failed */ | |
1087 | goto out; | |
b411b363 PR |
1088 | } |
1089 | ||
8f21420e PR |
1090 | if (likely(!(e->flags & EE_WAS_ERROR))) |
1091 | drbd_csum_ee(mdev, mdev->verify_tfm, e, digest); | |
1092 | else | |
1093 | memset(digest, 0, digest_size); | |
1094 | ||
53ea4331 LE |
1095 | /* Free e and pages before send. |
1096 | * In case we block on congestion, we could otherwise run into | |
1097 | * some distributed deadlock, if the other side blocks on | |
1098 | * congestion as well, because our receiver blocks in | |
1099 | * drbd_pp_alloc due to pp_in_use > max_buffers. */ | |
1100 | drbd_free_ee(mdev, e); | |
1101 | e = NULL; | |
8f21420e | 1102 | inc_rs_pending(mdev); |
53ea4331 LE |
1103 | ok = drbd_send_drequest_csum(mdev, sector, size, |
1104 | digest, digest_size, | |
1105 | P_OV_REPLY); | |
8f21420e PR |
1106 | if (!ok) |
1107 | dec_rs_pending(mdev); | |
1108 | kfree(digest); | |
1109 | ||
b411b363 | 1110 | out: |
53ea4331 LE |
1111 | if (e) |
1112 | drbd_free_ee(mdev, e); | |
b411b363 | 1113 | dec_unacked(mdev); |
b411b363 PR |
1114 | return ok; |
1115 | } | |
1116 | ||
1117 | void drbd_ov_oos_found(struct drbd_conf *mdev, sector_t sector, int size) | |
1118 | { | |
1119 | if (mdev->ov_last_oos_start + mdev->ov_last_oos_size == sector) { | |
1120 | mdev->ov_last_oos_size += size>>9; | |
1121 | } else { | |
1122 | mdev->ov_last_oos_start = sector; | |
1123 | mdev->ov_last_oos_size = size>>9; | |
1124 | } | |
1125 | drbd_set_out_of_sync(mdev, sector, size); | |
b411b363 PR |
1126 | } |
1127 | ||
1128 | int w_e_end_ov_reply(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1129 | { | |
1130 | struct drbd_epoch_entry *e = container_of(w, struct drbd_epoch_entry, w); | |
1131 | struct digest_info *di; | |
b411b363 | 1132 | void *digest; |
010f6e67 AG |
1133 | sector_t sector = e->i.sector; |
1134 | unsigned int size = e->i.size; | |
53ea4331 | 1135 | int digest_size; |
b411b363 PR |
1136 | int ok, eq = 0; |
1137 | ||
1138 | if (unlikely(cancel)) { | |
1139 | drbd_free_ee(mdev, e); | |
1140 | dec_unacked(mdev); | |
1141 | return 1; | |
1142 | } | |
1143 | ||
1144 | /* after "cancel", because after drbd_disconnect/drbd_rs_cancel_all | |
1145 | * the resync lru has been cleaned up already */ | |
1d53f09e | 1146 | if (get_ldev(mdev)) { |
010f6e67 | 1147 | drbd_rs_complete_io(mdev, e->i.sector); |
1d53f09e LE |
1148 | put_ldev(mdev); |
1149 | } | |
b411b363 | 1150 | |
85719573 | 1151 | di = e->digest; |
b411b363 | 1152 | |
45bb912b | 1153 | if (likely((e->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
1154 | digest_size = crypto_hash_digestsize(mdev->verify_tfm); |
1155 | digest = kmalloc(digest_size, GFP_NOIO); | |
1156 | if (digest) { | |
45bb912b | 1157 | drbd_csum_ee(mdev, mdev->verify_tfm, e, digest); |
b411b363 PR |
1158 | |
1159 | D_ASSERT(digest_size == di->digest_size); | |
1160 | eq = !memcmp(digest, di->digest, digest_size); | |
1161 | kfree(digest); | |
1162 | } | |
b411b363 PR |
1163 | } |
1164 | ||
53ea4331 LE |
1165 | /* Free e and pages before send. |
1166 | * In case we block on congestion, we could otherwise run into | |
1167 | * some distributed deadlock, if the other side blocks on | |
1168 | * congestion as well, because our receiver blocks in | |
1169 | * drbd_pp_alloc due to pp_in_use > max_buffers. */ | |
1170 | drbd_free_ee(mdev, e); | |
b411b363 | 1171 | if (!eq) |
53ea4331 | 1172 | drbd_ov_oos_found(mdev, sector, size); |
b411b363 PR |
1173 | else |
1174 | ov_oos_print(mdev); | |
1175 | ||
53ea4331 | 1176 | ok = drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, |
b411b363 PR |
1177 | eq ? ID_IN_SYNC : ID_OUT_OF_SYNC); |
1178 | ||
53ea4331 | 1179 | dec_unacked(mdev); |
b411b363 | 1180 | |
ea5442af LE |
1181 | --mdev->ov_left; |
1182 | ||
1183 | /* let's advance progress step marks only for every other megabyte */ | |
1184 | if ((mdev->ov_left & 0x200) == 0x200) | |
1185 | drbd_advance_rs_marks(mdev, mdev->ov_left); | |
1186 | ||
1187 | if (mdev->ov_left == 0) { | |
b411b363 PR |
1188 | ov_oos_print(mdev); |
1189 | drbd_resync_finished(mdev); | |
1190 | } | |
1191 | ||
1192 | return ok; | |
1193 | } | |
1194 | ||
1195 | int w_prev_work_done(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1196 | { | |
1197 | struct drbd_wq_barrier *b = container_of(w, struct drbd_wq_barrier, w); | |
1198 | complete(&b->done); | |
1199 | return 1; | |
1200 | } | |
1201 | ||
1202 | int w_send_barrier(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1203 | { | |
1204 | struct drbd_tl_epoch *b = container_of(w, struct drbd_tl_epoch, w); | |
e42325a5 | 1205 | struct p_barrier *p = &mdev->tconn->data.sbuf.barrier; |
b411b363 PR |
1206 | int ok = 1; |
1207 | ||
1208 | /* really avoid racing with tl_clear. w.cb may have been referenced | |
1209 | * just before it was reassigned and re-queued, so double check that. | |
1210 | * actually, this race was harmless, since we only try to send the | |
1211 | * barrier packet here, and otherwise do nothing with the object. | |
1212 | * but compare with the head of w_clear_epoch */ | |
1213 | spin_lock_irq(&mdev->req_lock); | |
1214 | if (w->cb != w_send_barrier || mdev->state.conn < C_CONNECTED) | |
1215 | cancel = 1; | |
1216 | spin_unlock_irq(&mdev->req_lock); | |
1217 | if (cancel) | |
1218 | return 1; | |
1219 | ||
1220 | if (!drbd_get_data_sock(mdev)) | |
1221 | return 0; | |
1222 | p->barrier = b->br_number; | |
1223 | /* inc_ap_pending was done where this was queued. | |
1224 | * dec_ap_pending will be done in got_BarrierAck | |
1225 | * or (on connection loss) in w_clear_epoch. */ | |
e42325a5 | 1226 | ok = _drbd_send_cmd(mdev, mdev->tconn->data.socket, P_BARRIER, |
0b70a13d | 1227 | (struct p_header80 *)p, sizeof(*p), 0); |
b411b363 PR |
1228 | drbd_put_data_sock(mdev); |
1229 | ||
1230 | return ok; | |
1231 | } | |
1232 | ||
1233 | int w_send_write_hint(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1234 | { | |
1235 | if (cancel) | |
1236 | return 1; | |
1237 | return drbd_send_short_cmd(mdev, P_UNPLUG_REMOTE); | |
1238 | } | |
1239 | ||
73a01a18 PR |
1240 | int w_send_oos(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
1241 | { | |
1242 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
1243 | int ok; | |
1244 | ||
1245 | if (unlikely(cancel)) { | |
8554df1c | 1246 | req_mod(req, SEND_CANCELED); |
73a01a18 PR |
1247 | return 1; |
1248 | } | |
1249 | ||
1250 | ok = drbd_send_oos(mdev, req); | |
8554df1c | 1251 | req_mod(req, OOS_HANDED_TO_NETWORK); |
73a01a18 PR |
1252 | |
1253 | return ok; | |
1254 | } | |
1255 | ||
b411b363 PR |
1256 | /** |
1257 | * w_send_dblock() - Worker callback to send a P_DATA packet in order to mirror a write request | |
1258 | * @mdev: DRBD device. | |
1259 | * @w: work object. | |
1260 | * @cancel: The connection will be closed anyways | |
1261 | */ | |
1262 | int w_send_dblock(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1263 | { | |
1264 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
1265 | int ok; | |
1266 | ||
1267 | if (unlikely(cancel)) { | |
8554df1c | 1268 | req_mod(req, SEND_CANCELED); |
b411b363 PR |
1269 | return 1; |
1270 | } | |
1271 | ||
1272 | ok = drbd_send_dblock(mdev, req); | |
8554df1c | 1273 | req_mod(req, ok ? HANDED_OVER_TO_NETWORK : SEND_FAILED); |
b411b363 PR |
1274 | |
1275 | return ok; | |
1276 | } | |
1277 | ||
1278 | /** | |
1279 | * w_send_read_req() - Worker callback to send a read request (P_DATA_REQUEST) packet | |
1280 | * @mdev: DRBD device. | |
1281 | * @w: work object. | |
1282 | * @cancel: The connection will be closed anyways | |
1283 | */ | |
1284 | int w_send_read_req(struct drbd_conf *mdev, struct drbd_work *w, int cancel) | |
1285 | { | |
1286 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
1287 | int ok; | |
1288 | ||
1289 | if (unlikely(cancel)) { | |
8554df1c | 1290 | req_mod(req, SEND_CANCELED); |
b411b363 PR |
1291 | return 1; |
1292 | } | |
1293 | ||
ace652ac | 1294 | ok = drbd_send_drequest(mdev, P_DATA_REQUEST, req->i.sector, req->i.size, |
b411b363 PR |
1295 | (unsigned long)req); |
1296 | ||
1297 | if (!ok) { | |
1298 | /* ?? we set C_TIMEOUT or C_BROKEN_PIPE in drbd_send(); | |
1299 | * so this is probably redundant */ | |
1300 | if (mdev->state.conn >= C_CONNECTED) | |
1301 | drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE)); | |
1302 | } | |
8554df1c | 1303 | req_mod(req, ok ? HANDED_OVER_TO_NETWORK : SEND_FAILED); |
b411b363 PR |
1304 | |
1305 | return ok; | |
1306 | } | |
1307 | ||
265be2d0 PR |
1308 | int w_restart_disk_io(struct drbd_conf *mdev, struct drbd_work *w, int cancel) |
1309 | { | |
1310 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
1311 | ||
0778286a | 1312 | if (bio_data_dir(req->master_bio) == WRITE && req->rq_state & RQ_IN_ACT_LOG) |
ace652ac | 1313 | drbd_al_begin_io(mdev, req->i.sector); |
265be2d0 PR |
1314 | /* Calling drbd_al_begin_io() out of the worker might deadlocks |
1315 | theoretically. Practically it can not deadlock, since this is | |
1316 | only used when unfreezing IOs. All the extents of the requests | |
1317 | that made it into the TL are already active */ | |
1318 | ||
1319 | drbd_req_make_private_bio(req, req->master_bio); | |
1320 | req->private_bio->bi_bdev = mdev->ldev->backing_bdev; | |
1321 | generic_make_request(req->private_bio); | |
1322 | ||
1323 | return 1; | |
1324 | } | |
1325 | ||
b411b363 PR |
1326 | static int _drbd_may_sync_now(struct drbd_conf *mdev) |
1327 | { | |
1328 | struct drbd_conf *odev = mdev; | |
1329 | ||
1330 | while (1) { | |
1331 | if (odev->sync_conf.after == -1) | |
1332 | return 1; | |
1333 | odev = minor_to_mdev(odev->sync_conf.after); | |
841ce241 AG |
1334 | if (!expect(odev)) |
1335 | return 1; | |
b411b363 PR |
1336 | if ((odev->state.conn >= C_SYNC_SOURCE && |
1337 | odev->state.conn <= C_PAUSED_SYNC_T) || | |
1338 | odev->state.aftr_isp || odev->state.peer_isp || | |
1339 | odev->state.user_isp) | |
1340 | return 0; | |
1341 | } | |
1342 | } | |
1343 | ||
1344 | /** | |
1345 | * _drbd_pause_after() - Pause resync on all devices that may not resync now | |
1346 | * @mdev: DRBD device. | |
1347 | * | |
1348 | * Called from process context only (admin command and after_state_ch). | |
1349 | */ | |
1350 | static int _drbd_pause_after(struct drbd_conf *mdev) | |
1351 | { | |
1352 | struct drbd_conf *odev; | |
1353 | int i, rv = 0; | |
1354 | ||
1355 | for (i = 0; i < minor_count; i++) { | |
1356 | odev = minor_to_mdev(i); | |
1357 | if (!odev) | |
1358 | continue; | |
1359 | if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS) | |
1360 | continue; | |
1361 | if (!_drbd_may_sync_now(odev)) | |
1362 | rv |= (__drbd_set_state(_NS(odev, aftr_isp, 1), CS_HARD, NULL) | |
1363 | != SS_NOTHING_TO_DO); | |
1364 | } | |
1365 | ||
1366 | return rv; | |
1367 | } | |
1368 | ||
1369 | /** | |
1370 | * _drbd_resume_next() - Resume resync on all devices that may resync now | |
1371 | * @mdev: DRBD device. | |
1372 | * | |
1373 | * Called from process context only (admin command and worker). | |
1374 | */ | |
1375 | static int _drbd_resume_next(struct drbd_conf *mdev) | |
1376 | { | |
1377 | struct drbd_conf *odev; | |
1378 | int i, rv = 0; | |
1379 | ||
1380 | for (i = 0; i < minor_count; i++) { | |
1381 | odev = minor_to_mdev(i); | |
1382 | if (!odev) | |
1383 | continue; | |
1384 | if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS) | |
1385 | continue; | |
1386 | if (odev->state.aftr_isp) { | |
1387 | if (_drbd_may_sync_now(odev)) | |
1388 | rv |= (__drbd_set_state(_NS(odev, aftr_isp, 0), | |
1389 | CS_HARD, NULL) | |
1390 | != SS_NOTHING_TO_DO) ; | |
1391 | } | |
1392 | } | |
1393 | return rv; | |
1394 | } | |
1395 | ||
1396 | void resume_next_sg(struct drbd_conf *mdev) | |
1397 | { | |
1398 | write_lock_irq(&global_state_lock); | |
1399 | _drbd_resume_next(mdev); | |
1400 | write_unlock_irq(&global_state_lock); | |
1401 | } | |
1402 | ||
1403 | void suspend_other_sg(struct drbd_conf *mdev) | |
1404 | { | |
1405 | write_lock_irq(&global_state_lock); | |
1406 | _drbd_pause_after(mdev); | |
1407 | write_unlock_irq(&global_state_lock); | |
1408 | } | |
1409 | ||
1410 | static int sync_after_error(struct drbd_conf *mdev, int o_minor) | |
1411 | { | |
1412 | struct drbd_conf *odev; | |
1413 | ||
1414 | if (o_minor == -1) | |
1415 | return NO_ERROR; | |
1416 | if (o_minor < -1 || minor_to_mdev(o_minor) == NULL) | |
1417 | return ERR_SYNC_AFTER; | |
1418 | ||
1419 | /* check for loops */ | |
1420 | odev = minor_to_mdev(o_minor); | |
1421 | while (1) { | |
1422 | if (odev == mdev) | |
1423 | return ERR_SYNC_AFTER_CYCLE; | |
1424 | ||
1425 | /* dependency chain ends here, no cycles. */ | |
1426 | if (odev->sync_conf.after == -1) | |
1427 | return NO_ERROR; | |
1428 | ||
1429 | /* follow the dependency chain */ | |
1430 | odev = minor_to_mdev(odev->sync_conf.after); | |
1431 | } | |
1432 | } | |
1433 | ||
1434 | int drbd_alter_sa(struct drbd_conf *mdev, int na) | |
1435 | { | |
1436 | int changes; | |
1437 | int retcode; | |
1438 | ||
1439 | write_lock_irq(&global_state_lock); | |
1440 | retcode = sync_after_error(mdev, na); | |
1441 | if (retcode == NO_ERROR) { | |
1442 | mdev->sync_conf.after = na; | |
1443 | do { | |
1444 | changes = _drbd_pause_after(mdev); | |
1445 | changes |= _drbd_resume_next(mdev); | |
1446 | } while (changes); | |
1447 | } | |
1448 | write_unlock_irq(&global_state_lock); | |
1449 | return retcode; | |
1450 | } | |
1451 | ||
9bd28d3c LE |
1452 | void drbd_rs_controller_reset(struct drbd_conf *mdev) |
1453 | { | |
1454 | atomic_set(&mdev->rs_sect_in, 0); | |
1455 | atomic_set(&mdev->rs_sect_ev, 0); | |
1456 | mdev->rs_in_flight = 0; | |
1457 | mdev->rs_planed = 0; | |
1458 | spin_lock(&mdev->peer_seq_lock); | |
1459 | fifo_set(&mdev->rs_plan_s, 0); | |
1460 | spin_unlock(&mdev->peer_seq_lock); | |
1461 | } | |
1462 | ||
b411b363 PR |
1463 | /** |
1464 | * drbd_start_resync() - Start the resync process | |
1465 | * @mdev: DRBD device. | |
1466 | * @side: Either C_SYNC_SOURCE or C_SYNC_TARGET | |
1467 | * | |
1468 | * This function might bring you directly into one of the | |
1469 | * C_PAUSED_SYNC_* states. | |
1470 | */ | |
1471 | void drbd_start_resync(struct drbd_conf *mdev, enum drbd_conns side) | |
1472 | { | |
1473 | union drbd_state ns; | |
1474 | int r; | |
1475 | ||
c4752ef1 | 1476 | if (mdev->state.conn >= C_SYNC_SOURCE && mdev->state.conn < C_AHEAD) { |
b411b363 PR |
1477 | dev_err(DEV, "Resync already running!\n"); |
1478 | return; | |
1479 | } | |
1480 | ||
59817f4f PR |
1481 | if (mdev->state.conn < C_AHEAD) { |
1482 | /* In case a previous resync run was aborted by an IO error/detach on the peer. */ | |
1483 | drbd_rs_cancel_all(mdev); | |
1484 | /* This should be done when we abort the resync. We definitely do not | |
1485 | want to have this for connections going back and forth between | |
1486 | Ahead/Behind and SyncSource/SyncTarget */ | |
1487 | } | |
b411b363 PR |
1488 | |
1489 | if (side == C_SYNC_TARGET) { | |
1490 | /* Since application IO was locked out during C_WF_BITMAP_T and | |
1491 | C_WF_SYNC_UUID we are still unmodified. Before going to C_SYNC_TARGET | |
1492 | we check that we might make the data inconsistent. */ | |
1493 | r = drbd_khelper(mdev, "before-resync-target"); | |
1494 | r = (r >> 8) & 0xff; | |
1495 | if (r > 0) { | |
1496 | dev_info(DEV, "before-resync-target handler returned %d, " | |
1497 | "dropping connection.\n", r); | |
1498 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
1499 | return; | |
1500 | } | |
09b9e797 PR |
1501 | } else /* C_SYNC_SOURCE */ { |
1502 | r = drbd_khelper(mdev, "before-resync-source"); | |
1503 | r = (r >> 8) & 0xff; | |
1504 | if (r > 0) { | |
1505 | if (r == 3) { | |
1506 | dev_info(DEV, "before-resync-source handler returned %d, " | |
1507 | "ignoring. Old userland tools?", r); | |
1508 | } else { | |
1509 | dev_info(DEV, "before-resync-source handler returned %d, " | |
1510 | "dropping connection.\n", r); | |
1511 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
1512 | return; | |
1513 | } | |
1514 | } | |
b411b363 PR |
1515 | } |
1516 | ||
1517 | drbd_state_lock(mdev); | |
1518 | ||
1519 | if (!get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
1520 | drbd_state_unlock(mdev); | |
1521 | return; | |
1522 | } | |
1523 | ||
b411b363 PR |
1524 | write_lock_irq(&global_state_lock); |
1525 | ns = mdev->state; | |
1526 | ||
1527 | ns.aftr_isp = !_drbd_may_sync_now(mdev); | |
1528 | ||
1529 | ns.conn = side; | |
1530 | ||
1531 | if (side == C_SYNC_TARGET) | |
1532 | ns.disk = D_INCONSISTENT; | |
1533 | else /* side == C_SYNC_SOURCE */ | |
1534 | ns.pdsk = D_INCONSISTENT; | |
1535 | ||
1536 | r = __drbd_set_state(mdev, ns, CS_VERBOSE, NULL); | |
1537 | ns = mdev->state; | |
1538 | ||
1539 | if (ns.conn < C_CONNECTED) | |
1540 | r = SS_UNKNOWN_ERROR; | |
1541 | ||
1542 | if (r == SS_SUCCESS) { | |
1d7734a0 LE |
1543 | unsigned long tw = drbd_bm_total_weight(mdev); |
1544 | unsigned long now = jiffies; | |
1545 | int i; | |
1546 | ||
b411b363 PR |
1547 | mdev->rs_failed = 0; |
1548 | mdev->rs_paused = 0; | |
b411b363 | 1549 | mdev->rs_same_csum = 0; |
0f0601f4 LE |
1550 | mdev->rs_last_events = 0; |
1551 | mdev->rs_last_sect_ev = 0; | |
1d7734a0 LE |
1552 | mdev->rs_total = tw; |
1553 | mdev->rs_start = now; | |
1554 | for (i = 0; i < DRBD_SYNC_MARKS; i++) { | |
1555 | mdev->rs_mark_left[i] = tw; | |
1556 | mdev->rs_mark_time[i] = now; | |
1557 | } | |
b411b363 PR |
1558 | _drbd_pause_after(mdev); |
1559 | } | |
1560 | write_unlock_irq(&global_state_lock); | |
5a22db89 | 1561 | |
b411b363 PR |
1562 | if (r == SS_SUCCESS) { |
1563 | dev_info(DEV, "Began resync as %s (will sync %lu KB [%lu bits set]).\n", | |
1564 | drbd_conn_str(ns.conn), | |
1565 | (unsigned long) mdev->rs_total << (BM_BLOCK_SHIFT-10), | |
1566 | (unsigned long) mdev->rs_total); | |
6c922ed5 LE |
1567 | if (side == C_SYNC_TARGET) |
1568 | mdev->bm_resync_fo = 0; | |
1569 | ||
1570 | /* Since protocol 96, we must serialize drbd_gen_and_send_sync_uuid | |
1571 | * with w_send_oos, or the sync target will get confused as to | |
1572 | * how much bits to resync. We cannot do that always, because for an | |
1573 | * empty resync and protocol < 95, we need to do it here, as we call | |
1574 | * drbd_resync_finished from here in that case. | |
1575 | * We drbd_gen_and_send_sync_uuid here for protocol < 96, | |
1576 | * and from after_state_ch otherwise. */ | |
31890f4a | 1577 | if (side == C_SYNC_SOURCE && mdev->tconn->agreed_pro_version < 96) |
6c922ed5 | 1578 | drbd_gen_and_send_sync_uuid(mdev); |
b411b363 | 1579 | |
31890f4a | 1580 | if (mdev->tconn->agreed_pro_version < 95 && mdev->rs_total == 0) { |
af85e8e8 LE |
1581 | /* This still has a race (about when exactly the peers |
1582 | * detect connection loss) that can lead to a full sync | |
1583 | * on next handshake. In 8.3.9 we fixed this with explicit | |
1584 | * resync-finished notifications, but the fix | |
1585 | * introduces a protocol change. Sleeping for some | |
1586 | * time longer than the ping interval + timeout on the | |
1587 | * SyncSource, to give the SyncTarget the chance to | |
1588 | * detect connection loss, then waiting for a ping | |
1589 | * response (implicit in drbd_resync_finished) reduces | |
1590 | * the race considerably, but does not solve it. */ | |
1591 | if (side == C_SYNC_SOURCE) | |
1592 | schedule_timeout_interruptible( | |
89e58e75 PR |
1593 | mdev->tconn->net_conf->ping_int * HZ + |
1594 | mdev->tconn->net_conf->ping_timeo*HZ/9); | |
b411b363 | 1595 | drbd_resync_finished(mdev); |
b411b363 PR |
1596 | } |
1597 | ||
9bd28d3c | 1598 | drbd_rs_controller_reset(mdev); |
b411b363 PR |
1599 | /* ns.conn may already be != mdev->state.conn, |
1600 | * we may have been paused in between, or become paused until | |
1601 | * the timer triggers. | |
1602 | * No matter, that is handled in resync_timer_fn() */ | |
1603 | if (ns.conn == C_SYNC_TARGET) | |
1604 | mod_timer(&mdev->resync_timer, jiffies); | |
1605 | ||
1606 | drbd_md_sync(mdev); | |
1607 | } | |
5a22db89 | 1608 | put_ldev(mdev); |
d0c3f60f | 1609 | drbd_state_unlock(mdev); |
b411b363 PR |
1610 | } |
1611 | ||
1612 | int drbd_worker(struct drbd_thread *thi) | |
1613 | { | |
1614 | struct drbd_conf *mdev = thi->mdev; | |
1615 | struct drbd_work *w = NULL; | |
1616 | LIST_HEAD(work_list); | |
1617 | int intr = 0, i; | |
1618 | ||
1619 | sprintf(current->comm, "drbd%d_worker", mdev_to_minor(mdev)); | |
1620 | ||
e77a0a5c | 1621 | while (get_t_state(thi) == RUNNING) { |
b411b363 PR |
1622 | drbd_thread_current_set_cpu(mdev); |
1623 | ||
e42325a5 PR |
1624 | if (down_trylock(&mdev->tconn->data.work.s)) { |
1625 | mutex_lock(&mdev->tconn->data.mutex); | |
1626 | if (mdev->tconn->data.socket && !mdev->tconn->net_conf->no_cork) | |
1627 | drbd_tcp_uncork(mdev->tconn->data.socket); | |
1628 | mutex_unlock(&mdev->tconn->data.mutex); | |
b411b363 | 1629 | |
e42325a5 | 1630 | intr = down_interruptible(&mdev->tconn->data.work.s); |
b411b363 | 1631 | |
e42325a5 PR |
1632 | mutex_lock(&mdev->tconn->data.mutex); |
1633 | if (mdev->tconn->data.socket && !mdev->tconn->net_conf->no_cork) | |
1634 | drbd_tcp_cork(mdev->tconn->data.socket); | |
1635 | mutex_unlock(&mdev->tconn->data.mutex); | |
b411b363 PR |
1636 | } |
1637 | ||
1638 | if (intr) { | |
1639 | D_ASSERT(intr == -EINTR); | |
1640 | flush_signals(current); | |
841ce241 | 1641 | if (!expect(get_t_state(thi) != RUNNING)) |
b411b363 PR |
1642 | continue; |
1643 | break; | |
1644 | } | |
1645 | ||
e77a0a5c | 1646 | if (get_t_state(thi) != RUNNING) |
b411b363 PR |
1647 | break; |
1648 | /* With this break, we have done a down() but not consumed | |
1649 | the entry from the list. The cleanup code takes care of | |
1650 | this... */ | |
1651 | ||
1652 | w = NULL; | |
e42325a5 PR |
1653 | spin_lock_irq(&mdev->tconn->data.work.q_lock); |
1654 | if (!expect(!list_empty(&mdev->tconn->data.work.q))) { | |
b411b363 PR |
1655 | /* something terribly wrong in our logic. |
1656 | * we were able to down() the semaphore, | |
1657 | * but the list is empty... doh. | |
1658 | * | |
1659 | * what is the best thing to do now? | |
1660 | * try again from scratch, restarting the receiver, | |
1661 | * asender, whatnot? could break even more ugly, | |
1662 | * e.g. when we are primary, but no good local data. | |
1663 | * | |
1664 | * I'll try to get away just starting over this loop. | |
1665 | */ | |
e42325a5 | 1666 | spin_unlock_irq(&mdev->tconn->data.work.q_lock); |
b411b363 PR |
1667 | continue; |
1668 | } | |
e42325a5 | 1669 | w = list_entry(mdev->tconn->data.work.q.next, struct drbd_work, list); |
b411b363 | 1670 | list_del_init(&w->list); |
e42325a5 | 1671 | spin_unlock_irq(&mdev->tconn->data.work.q_lock); |
b411b363 PR |
1672 | |
1673 | if (!w->cb(mdev, w, mdev->state.conn < C_CONNECTED)) { | |
1674 | /* dev_warn(DEV, "worker: a callback failed! \n"); */ | |
1675 | if (mdev->state.conn >= C_CONNECTED) | |
1676 | drbd_force_state(mdev, | |
1677 | NS(conn, C_NETWORK_FAILURE)); | |
1678 | } | |
1679 | } | |
1680 | D_ASSERT(test_bit(DEVICE_DYING, &mdev->flags)); | |
1681 | D_ASSERT(test_bit(CONFIG_PENDING, &mdev->flags)); | |
1682 | ||
e42325a5 | 1683 | spin_lock_irq(&mdev->tconn->data.work.q_lock); |
b411b363 | 1684 | i = 0; |
e42325a5 PR |
1685 | while (!list_empty(&mdev->tconn->data.work.q)) { |
1686 | list_splice_init(&mdev->tconn->data.work.q, &work_list); | |
1687 | spin_unlock_irq(&mdev->tconn->data.work.q_lock); | |
b411b363 PR |
1688 | |
1689 | while (!list_empty(&work_list)) { | |
1690 | w = list_entry(work_list.next, struct drbd_work, list); | |
1691 | list_del_init(&w->list); | |
1692 | w->cb(mdev, w, 1); | |
1693 | i++; /* dead debugging code */ | |
1694 | } | |
1695 | ||
e42325a5 | 1696 | spin_lock_irq(&mdev->tconn->data.work.q_lock); |
b411b363 | 1697 | } |
e42325a5 | 1698 | sema_init(&mdev->tconn->data.work.s, 0); |
b411b363 PR |
1699 | /* DANGEROUS race: if someone did queue his work within the spinlock, |
1700 | * but up() ed outside the spinlock, we could get an up() on the | |
1701 | * semaphore without corresponding list entry. | |
1702 | * So don't do that. | |
1703 | */ | |
e42325a5 | 1704 | spin_unlock_irq(&mdev->tconn->data.work.q_lock); |
b411b363 PR |
1705 | |
1706 | D_ASSERT(mdev->state.disk == D_DISKLESS && mdev->state.conn == C_STANDALONE); | |
1707 | /* _drbd_set_state only uses stop_nowait. | |
e6b3ea83 PR |
1708 | * wait here for the exiting receiver. */ |
1709 | drbd_thread_stop(&mdev->tconn->receiver); | |
b411b363 PR |
1710 | drbd_mdev_cleanup(mdev); |
1711 | ||
1712 | dev_info(DEV, "worker terminated\n"); | |
1713 | ||
1714 | clear_bit(DEVICE_DYING, &mdev->flags); | |
1715 | clear_bit(CONFIG_PENDING, &mdev->flags); | |
1716 | wake_up(&mdev->state_wait); | |
1717 | ||
1718 | return 0; | |
1719 | } |