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 | |
00d56944 | 41 | static int w_make_ov_request(struct drbd_work *w, int cancel); |
b411b363 PR |
42 | |
43 | ||
c5a91619 AG |
44 | /* endio handlers: |
45 | * drbd_md_io_complete (defined here) | |
fcefa62e AG |
46 | * drbd_request_endio (defined here) |
47 | * drbd_peer_request_endio (defined here) | |
c5a91619 AG |
48 | * bm_async_io_complete (defined in drbd_bitmap.c) |
49 | * | |
b411b363 PR |
50 | * For all these callbacks, note the following: |
51 | * The callbacks will be called in irq context by the IDE drivers, | |
52 | * and in Softirqs/Tasklets/BH context by the SCSI drivers. | |
53 | * Try to get the locking right :) | |
54 | * | |
55 | */ | |
56 | ||
57 | ||
58 | /* About the global_state_lock | |
59 | Each state transition on an device holds a read lock. In case we have | |
95f8efd0 | 60 | to evaluate the resync after dependencies, we grab a write lock, because |
b411b363 PR |
61 | we need stable states on all devices for that. */ |
62 | rwlock_t global_state_lock; | |
63 | ||
64 | /* used for synchronous meta data and bitmap IO | |
65 | * submitted by drbd_md_sync_page_io() | |
66 | */ | |
67 | void drbd_md_io_complete(struct bio *bio, int error) | |
68 | { | |
69 | struct drbd_md_io *md_io; | |
cdfda633 | 70 | struct drbd_conf *mdev; |
b411b363 PR |
71 | |
72 | md_io = (struct drbd_md_io *)bio->bi_private; | |
cdfda633 PR |
73 | mdev = container_of(md_io, struct drbd_conf, md_io); |
74 | ||
b411b363 PR |
75 | md_io->error = error; |
76 | ||
0cfac5dd PR |
77 | /* We grabbed an extra reference in _drbd_md_sync_page_io() to be able |
78 | * to timeout on the lower level device, and eventually detach from it. | |
79 | * If this io completion runs after that timeout expired, this | |
80 | * drbd_md_put_buffer() may allow us to finally try and re-attach. | |
81 | * During normal operation, this only puts that extra reference | |
82 | * down to 1 again. | |
83 | * Make sure we first drop the reference, and only then signal | |
84 | * completion, or we may (in drbd_al_read_log()) cycle so fast into the | |
85 | * next drbd_md_sync_page_io(), that we trigger the | |
86 | * ASSERT(atomic_read(&mdev->md_io_in_use) == 1) there. | |
87 | */ | |
88 | drbd_md_put_buffer(mdev); | |
cdfda633 PR |
89 | md_io->done = 1; |
90 | wake_up(&mdev->misc_wait); | |
91 | bio_put(bio); | |
cdfda633 | 92 | put_ldev(mdev); |
b411b363 PR |
93 | } |
94 | ||
95 | /* reads on behalf of the partner, | |
96 | * "submitted" by the receiver | |
97 | */ | |
db830c46 | 98 | void drbd_endio_read_sec_final(struct drbd_peer_request *peer_req) __releases(local) |
b411b363 PR |
99 | { |
100 | unsigned long flags = 0; | |
a21e9298 | 101 | struct drbd_conf *mdev = peer_req->w.mdev; |
b411b363 | 102 | |
87eeee41 | 103 | spin_lock_irqsave(&mdev->tconn->req_lock, flags); |
db830c46 AG |
104 | mdev->read_cnt += peer_req->i.size >> 9; |
105 | list_del(&peer_req->w.list); | |
b411b363 PR |
106 | if (list_empty(&mdev->read_ee)) |
107 | wake_up(&mdev->ee_wait); | |
db830c46 | 108 | if (test_bit(__EE_WAS_ERROR, &peer_req->flags)) |
81e84650 | 109 | __drbd_chk_io_error(mdev, false); |
87eeee41 | 110 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); |
b411b363 | 111 | |
d5b27b01 | 112 | drbd_queue_work(&mdev->tconn->sender_work, &peer_req->w); |
b411b363 | 113 | put_ldev(mdev); |
b411b363 PR |
114 | } |
115 | ||
116 | /* writes on behalf of the partner, or resync writes, | |
45bb912b | 117 | * "submitted" by the receiver, final stage. */ |
db830c46 | 118 | static void drbd_endio_write_sec_final(struct drbd_peer_request *peer_req) __releases(local) |
b411b363 PR |
119 | { |
120 | unsigned long flags = 0; | |
a21e9298 | 121 | struct drbd_conf *mdev = peer_req->w.mdev; |
181286ad | 122 | struct drbd_interval i; |
b411b363 | 123 | int do_wake; |
579b57ed | 124 | u64 block_id; |
b411b363 | 125 | int do_al_complete_io; |
b411b363 | 126 | |
db830c46 | 127 | /* after we moved peer_req to done_ee, |
b411b363 PR |
128 | * we may no longer access it, |
129 | * it may be freed/reused already! | |
130 | * (as soon as we release the req_lock) */ | |
181286ad | 131 | i = peer_req->i; |
db830c46 AG |
132 | do_al_complete_io = peer_req->flags & EE_CALL_AL_COMPLETE_IO; |
133 | block_id = peer_req->block_id; | |
b411b363 | 134 | |
87eeee41 | 135 | spin_lock_irqsave(&mdev->tconn->req_lock, flags); |
db830c46 AG |
136 | mdev->writ_cnt += peer_req->i.size >> 9; |
137 | list_del(&peer_req->w.list); /* has been on active_ee or sync_ee */ | |
138 | list_add_tail(&peer_req->w.list, &mdev->done_ee); | |
b411b363 | 139 | |
bb3bfe96 | 140 | /* |
5e472264 | 141 | * Do not remove from the write_requests tree here: we did not send the |
bb3bfe96 AG |
142 | * Ack yet and did not wake possibly waiting conflicting requests. |
143 | * Removed from the tree from "drbd_process_done_ee" within the | |
144 | * appropriate w.cb (e_end_block/e_end_resync_block) or from | |
145 | * _drbd_clear_done_ee. | |
146 | */ | |
b411b363 | 147 | |
579b57ed | 148 | do_wake = list_empty(block_id == ID_SYNCER ? &mdev->sync_ee : &mdev->active_ee); |
b411b363 | 149 | |
db830c46 | 150 | if (test_bit(__EE_WAS_ERROR, &peer_req->flags)) |
81e84650 | 151 | __drbd_chk_io_error(mdev, false); |
87eeee41 | 152 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); |
b411b363 | 153 | |
579b57ed | 154 | if (block_id == ID_SYNCER) |
181286ad | 155 | drbd_rs_complete_io(mdev, i.sector); |
b411b363 PR |
156 | |
157 | if (do_wake) | |
158 | wake_up(&mdev->ee_wait); | |
159 | ||
160 | if (do_al_complete_io) | |
181286ad | 161 | drbd_al_complete_io(mdev, &i); |
b411b363 | 162 | |
0625ac19 | 163 | wake_asender(mdev->tconn); |
b411b363 | 164 | put_ldev(mdev); |
45bb912b | 165 | } |
b411b363 | 166 | |
45bb912b LE |
167 | /* writes on behalf of the partner, or resync writes, |
168 | * "submitted" by the receiver. | |
169 | */ | |
fcefa62e | 170 | void drbd_peer_request_endio(struct bio *bio, int error) |
45bb912b | 171 | { |
db830c46 | 172 | struct drbd_peer_request *peer_req = bio->bi_private; |
a21e9298 | 173 | struct drbd_conf *mdev = peer_req->w.mdev; |
45bb912b LE |
174 | int uptodate = bio_flagged(bio, BIO_UPTODATE); |
175 | int is_write = bio_data_dir(bio) == WRITE; | |
176 | ||
07194272 | 177 | if (error && __ratelimit(&drbd_ratelimit_state)) |
45bb912b LE |
178 | dev_warn(DEV, "%s: error=%d s=%llus\n", |
179 | is_write ? "write" : "read", error, | |
db830c46 | 180 | (unsigned long long)peer_req->i.sector); |
45bb912b | 181 | if (!error && !uptodate) { |
07194272 LE |
182 | if (__ratelimit(&drbd_ratelimit_state)) |
183 | dev_warn(DEV, "%s: setting error to -EIO s=%llus\n", | |
184 | is_write ? "write" : "read", | |
db830c46 | 185 | (unsigned long long)peer_req->i.sector); |
45bb912b LE |
186 | /* strange behavior of some lower level drivers... |
187 | * fail the request by clearing the uptodate flag, | |
188 | * but do not return any error?! */ | |
189 | error = -EIO; | |
190 | } | |
191 | ||
192 | if (error) | |
db830c46 | 193 | set_bit(__EE_WAS_ERROR, &peer_req->flags); |
45bb912b LE |
194 | |
195 | bio_put(bio); /* no need for the bio anymore */ | |
db830c46 | 196 | if (atomic_dec_and_test(&peer_req->pending_bios)) { |
45bb912b | 197 | if (is_write) |
db830c46 | 198 | drbd_endio_write_sec_final(peer_req); |
45bb912b | 199 | else |
db830c46 | 200 | drbd_endio_read_sec_final(peer_req); |
45bb912b | 201 | } |
b411b363 PR |
202 | } |
203 | ||
204 | /* read, readA or write requests on R_PRIMARY coming from drbd_make_request | |
205 | */ | |
fcefa62e | 206 | void drbd_request_endio(struct bio *bio, int error) |
b411b363 | 207 | { |
a115413d | 208 | unsigned long flags; |
b411b363 | 209 | struct drbd_request *req = bio->bi_private; |
a21e9298 | 210 | struct drbd_conf *mdev = req->w.mdev; |
a115413d | 211 | struct bio_and_error m; |
b411b363 PR |
212 | enum drbd_req_event what; |
213 | int uptodate = bio_flagged(bio, BIO_UPTODATE); | |
214 | ||
b411b363 PR |
215 | if (!error && !uptodate) { |
216 | dev_warn(DEV, "p %s: setting error to -EIO\n", | |
217 | bio_data_dir(bio) == WRITE ? "write" : "read"); | |
218 | /* strange behavior of some lower level drivers... | |
219 | * fail the request by clearing the uptodate flag, | |
220 | * but do not return any error?! */ | |
221 | error = -EIO; | |
222 | } | |
223 | ||
b411b363 PR |
224 | /* to avoid recursion in __req_mod */ |
225 | if (unlikely(error)) { | |
226 | what = (bio_data_dir(bio) == WRITE) | |
8554df1c | 227 | ? WRITE_COMPLETED_WITH_ERROR |
5c3c7e64 | 228 | : (bio_rw(bio) == READ) |
8554df1c AG |
229 | ? READ_COMPLETED_WITH_ERROR |
230 | : READ_AHEAD_COMPLETED_WITH_ERROR; | |
b411b363 | 231 | } else |
8554df1c | 232 | what = COMPLETED_OK; |
b411b363 PR |
233 | |
234 | bio_put(req->private_bio); | |
235 | req->private_bio = ERR_PTR(error); | |
236 | ||
a115413d | 237 | /* not req_mod(), we need irqsave here! */ |
87eeee41 | 238 | spin_lock_irqsave(&mdev->tconn->req_lock, flags); |
a115413d | 239 | __req_mod(req, what, &m); |
87eeee41 | 240 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); |
2415308e | 241 | put_ldev(mdev); |
a115413d LE |
242 | |
243 | if (m.bio) | |
244 | complete_master_bio(mdev, &m); | |
b411b363 PR |
245 | } |
246 | ||
f6ffca9f | 247 | void drbd_csum_ee(struct drbd_conf *mdev, struct crypto_hash *tfm, |
db830c46 | 248 | struct drbd_peer_request *peer_req, void *digest) |
45bb912b LE |
249 | { |
250 | struct hash_desc desc; | |
251 | struct scatterlist sg; | |
db830c46 | 252 | struct page *page = peer_req->pages; |
45bb912b LE |
253 | struct page *tmp; |
254 | unsigned len; | |
255 | ||
256 | desc.tfm = tfm; | |
257 | desc.flags = 0; | |
258 | ||
259 | sg_init_table(&sg, 1); | |
260 | crypto_hash_init(&desc); | |
261 | ||
262 | while ((tmp = page_chain_next(page))) { | |
263 | /* all but the last page will be fully used */ | |
264 | sg_set_page(&sg, page, PAGE_SIZE, 0); | |
265 | crypto_hash_update(&desc, &sg, sg.length); | |
266 | page = tmp; | |
267 | } | |
268 | /* and now the last, possibly only partially used page */ | |
db830c46 | 269 | len = peer_req->i.size & (PAGE_SIZE - 1); |
45bb912b LE |
270 | sg_set_page(&sg, page, len ?: PAGE_SIZE, 0); |
271 | crypto_hash_update(&desc, &sg, sg.length); | |
272 | crypto_hash_final(&desc, digest); | |
273 | } | |
274 | ||
275 | void drbd_csum_bio(struct drbd_conf *mdev, struct crypto_hash *tfm, struct bio *bio, void *digest) | |
b411b363 PR |
276 | { |
277 | struct hash_desc desc; | |
278 | struct scatterlist sg; | |
279 | struct bio_vec *bvec; | |
280 | int i; | |
281 | ||
282 | desc.tfm = tfm; | |
283 | desc.flags = 0; | |
284 | ||
285 | sg_init_table(&sg, 1); | |
286 | crypto_hash_init(&desc); | |
287 | ||
4b8514ee | 288 | bio_for_each_segment(bvec, bio, i) { |
b411b363 PR |
289 | sg_set_page(&sg, bvec->bv_page, bvec->bv_len, bvec->bv_offset); |
290 | crypto_hash_update(&desc, &sg, sg.length); | |
291 | } | |
292 | crypto_hash_final(&desc, digest); | |
293 | } | |
294 | ||
9676c760 | 295 | /* MAYBE merge common code with w_e_end_ov_req */ |
99920dc5 | 296 | static int w_e_send_csum(struct drbd_work *w, int cancel) |
b411b363 | 297 | { |
00d56944 PR |
298 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
299 | struct drbd_conf *mdev = w->mdev; | |
b411b363 PR |
300 | int digest_size; |
301 | void *digest; | |
99920dc5 | 302 | int err = 0; |
b411b363 | 303 | |
53ea4331 LE |
304 | if (unlikely(cancel)) |
305 | goto out; | |
b411b363 | 306 | |
9676c760 | 307 | if (unlikely((peer_req->flags & EE_WAS_ERROR) != 0)) |
53ea4331 | 308 | goto out; |
b411b363 | 309 | |
f399002e | 310 | digest_size = crypto_hash_digestsize(mdev->tconn->csums_tfm); |
53ea4331 LE |
311 | digest = kmalloc(digest_size, GFP_NOIO); |
312 | if (digest) { | |
db830c46 AG |
313 | sector_t sector = peer_req->i.sector; |
314 | unsigned int size = peer_req->i.size; | |
f399002e | 315 | drbd_csum_ee(mdev, mdev->tconn->csums_tfm, peer_req, digest); |
9676c760 | 316 | /* Free peer_req and pages before send. |
53ea4331 LE |
317 | * In case we block on congestion, we could otherwise run into |
318 | * some distributed deadlock, if the other side blocks on | |
319 | * congestion as well, because our receiver blocks in | |
c37c8ecf | 320 | * drbd_alloc_pages due to pp_in_use > max_buffers. */ |
3967deb1 | 321 | drbd_free_peer_req(mdev, peer_req); |
db830c46 | 322 | peer_req = NULL; |
53ea4331 | 323 | inc_rs_pending(mdev); |
99920dc5 | 324 | err = drbd_send_drequest_csum(mdev, sector, size, |
db1b0b72 AG |
325 | digest, digest_size, |
326 | P_CSUM_RS_REQUEST); | |
53ea4331 LE |
327 | kfree(digest); |
328 | } else { | |
329 | dev_err(DEV, "kmalloc() of digest failed.\n"); | |
99920dc5 | 330 | err = -ENOMEM; |
53ea4331 | 331 | } |
b411b363 | 332 | |
53ea4331 | 333 | out: |
db830c46 | 334 | if (peer_req) |
3967deb1 | 335 | drbd_free_peer_req(mdev, peer_req); |
b411b363 | 336 | |
99920dc5 | 337 | if (unlikely(err)) |
b411b363 | 338 | dev_err(DEV, "drbd_send_drequest(..., csum) failed\n"); |
99920dc5 | 339 | return err; |
b411b363 PR |
340 | } |
341 | ||
342 | #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) | |
343 | ||
344 | static int read_for_csum(struct drbd_conf *mdev, sector_t sector, int size) | |
345 | { | |
db830c46 | 346 | struct drbd_peer_request *peer_req; |
b411b363 PR |
347 | |
348 | if (!get_ldev(mdev)) | |
80a40e43 | 349 | return -EIO; |
b411b363 | 350 | |
e3555d85 | 351 | if (drbd_rs_should_slow_down(mdev, sector)) |
0f0601f4 LE |
352 | goto defer; |
353 | ||
b411b363 PR |
354 | /* GFP_TRY, because if there is no memory available right now, this may |
355 | * be rescheduled for later. It is "only" background resync, after all. */ | |
0db55363 AG |
356 | peer_req = drbd_alloc_peer_req(mdev, ID_SYNCER /* unused */, sector, |
357 | size, GFP_TRY); | |
db830c46 | 358 | if (!peer_req) |
80a40e43 | 359 | goto defer; |
b411b363 | 360 | |
db830c46 | 361 | peer_req->w.cb = w_e_send_csum; |
87eeee41 | 362 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 | 363 | list_add(&peer_req->w.list, &mdev->read_ee); |
87eeee41 | 364 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 365 | |
0f0601f4 | 366 | atomic_add(size >> 9, &mdev->rs_sect_ev); |
fbe29dec | 367 | if (drbd_submit_peer_request(mdev, peer_req, 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. */ | |
87eeee41 | 374 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 | 375 | list_del(&peer_req->w.list); |
87eeee41 | 376 | spin_unlock_irq(&mdev->tconn->req_lock); |
22cc37a9 | 377 | |
3967deb1 | 378 | drbd_free_peer_req(mdev, peer_req); |
80a40e43 | 379 | defer: |
45bb912b | 380 | put_ldev(mdev); |
80a40e43 | 381 | return -EAGAIN; |
b411b363 PR |
382 | } |
383 | ||
99920dc5 | 384 | int w_resync_timer(struct drbd_work *w, int cancel) |
b411b363 | 385 | { |
00d56944 | 386 | struct drbd_conf *mdev = w->mdev; |
63106d3c PR |
387 | switch (mdev->state.conn) { |
388 | case C_VERIFY_S: | |
00d56944 | 389 | w_make_ov_request(w, cancel); |
63106d3c PR |
390 | break; |
391 | case C_SYNC_TARGET: | |
00d56944 | 392 | w_make_resync_request(w, cancel); |
63106d3c | 393 | break; |
b411b363 PR |
394 | } |
395 | ||
99920dc5 | 396 | return 0; |
794abb75 PR |
397 | } |
398 | ||
399 | void resync_timer_fn(unsigned long data) | |
400 | { | |
401 | struct drbd_conf *mdev = (struct drbd_conf *) data; | |
402 | ||
403 | if (list_empty(&mdev->resync_work.list)) | |
d5b27b01 | 404 | drbd_queue_work(&mdev->tconn->sender_work, &mdev->resync_work); |
b411b363 PR |
405 | } |
406 | ||
778f271d PR |
407 | static void fifo_set(struct fifo_buffer *fb, int value) |
408 | { | |
409 | int i; | |
410 | ||
411 | for (i = 0; i < fb->size; i++) | |
f10f2623 | 412 | fb->values[i] = value; |
778f271d PR |
413 | } |
414 | ||
415 | static int fifo_push(struct fifo_buffer *fb, int value) | |
416 | { | |
417 | int ov; | |
418 | ||
419 | ov = fb->values[fb->head_index]; | |
420 | fb->values[fb->head_index++] = value; | |
421 | ||
422 | if (fb->head_index >= fb->size) | |
423 | fb->head_index = 0; | |
424 | ||
425 | return ov; | |
426 | } | |
427 | ||
428 | static void fifo_add_val(struct fifo_buffer *fb, int value) | |
429 | { | |
430 | int i; | |
431 | ||
432 | for (i = 0; i < fb->size; i++) | |
433 | fb->values[i] += value; | |
434 | } | |
435 | ||
9958c857 PR |
436 | struct fifo_buffer *fifo_alloc(int fifo_size) |
437 | { | |
438 | struct fifo_buffer *fb; | |
439 | ||
440 | fb = kzalloc(sizeof(struct fifo_buffer) + sizeof(int) * fifo_size, GFP_KERNEL); | |
441 | if (!fb) | |
442 | return NULL; | |
443 | ||
444 | fb->head_index = 0; | |
445 | fb->size = fifo_size; | |
446 | fb->total = 0; | |
447 | ||
448 | return fb; | |
449 | } | |
450 | ||
9d77a5fe | 451 | static int drbd_rs_controller(struct drbd_conf *mdev) |
778f271d | 452 | { |
daeda1cc | 453 | struct disk_conf *dc; |
778f271d PR |
454 | unsigned int sect_in; /* Number of sectors that came in since the last turn */ |
455 | unsigned int want; /* The number of sectors we want in the proxy */ | |
456 | int req_sect; /* Number of sectors to request in this turn */ | |
457 | int correction; /* Number of sectors more we need in the proxy*/ | |
458 | int cps; /* correction per invocation of drbd_rs_controller() */ | |
459 | int steps; /* Number of time steps to plan ahead */ | |
460 | int curr_corr; | |
461 | int max_sect; | |
813472ce | 462 | struct fifo_buffer *plan; |
778f271d PR |
463 | |
464 | sect_in = atomic_xchg(&mdev->rs_sect_in, 0); /* Number of sectors that came in */ | |
465 | mdev->rs_in_flight -= sect_in; | |
466 | ||
daeda1cc | 467 | dc = rcu_dereference(mdev->ldev->disk_conf); |
813472ce | 468 | plan = rcu_dereference(mdev->rs_plan_s); |
778f271d | 469 | |
813472ce | 470 | steps = plan->size; /* (dc->c_plan_ahead * 10 * SLEEP_TIME) / HZ; */ |
778f271d PR |
471 | |
472 | if (mdev->rs_in_flight + sect_in == 0) { /* At start of resync */ | |
daeda1cc | 473 | want = ((dc->resync_rate * 2 * SLEEP_TIME) / HZ) * steps; |
778f271d | 474 | } else { /* normal path */ |
daeda1cc PR |
475 | want = dc->c_fill_target ? dc->c_fill_target : |
476 | sect_in * dc->c_delay_target * HZ / (SLEEP_TIME * 10); | |
778f271d PR |
477 | } |
478 | ||
813472ce | 479 | correction = want - mdev->rs_in_flight - plan->total; |
778f271d PR |
480 | |
481 | /* Plan ahead */ | |
482 | cps = correction / steps; | |
813472ce PR |
483 | fifo_add_val(plan, cps); |
484 | plan->total += cps * steps; | |
778f271d PR |
485 | |
486 | /* What we do in this step */ | |
813472ce PR |
487 | curr_corr = fifo_push(plan, 0); |
488 | plan->total -= curr_corr; | |
778f271d PR |
489 | |
490 | req_sect = sect_in + curr_corr; | |
491 | if (req_sect < 0) | |
492 | req_sect = 0; | |
493 | ||
daeda1cc | 494 | max_sect = (dc->c_max_rate * 2 * SLEEP_TIME) / HZ; |
778f271d PR |
495 | if (req_sect > max_sect) |
496 | req_sect = max_sect; | |
497 | ||
498 | /* | |
499 | dev_warn(DEV, "si=%u if=%d wa=%u co=%d st=%d cps=%d pl=%d cc=%d rs=%d\n", | |
500 | sect_in, mdev->rs_in_flight, want, correction, | |
501 | steps, cps, mdev->rs_planed, curr_corr, req_sect); | |
502 | */ | |
503 | ||
504 | return req_sect; | |
505 | } | |
506 | ||
9d77a5fe | 507 | static int drbd_rs_number_requests(struct drbd_conf *mdev) |
e65f440d LE |
508 | { |
509 | int number; | |
813472ce PR |
510 | |
511 | rcu_read_lock(); | |
512 | if (rcu_dereference(mdev->rs_plan_s)->size) { | |
e65f440d LE |
513 | number = drbd_rs_controller(mdev) >> (BM_BLOCK_SHIFT - 9); |
514 | mdev->c_sync_rate = number * HZ * (BM_BLOCK_SIZE / 1024) / SLEEP_TIME; | |
515 | } else { | |
daeda1cc | 516 | mdev->c_sync_rate = rcu_dereference(mdev->ldev->disk_conf)->resync_rate; |
e65f440d LE |
517 | number = SLEEP_TIME * mdev->c_sync_rate / ((BM_BLOCK_SIZE / 1024) * HZ); |
518 | } | |
813472ce | 519 | rcu_read_unlock(); |
e65f440d | 520 | |
e65f440d LE |
521 | /* ignore the amount of pending requests, the resync controller should |
522 | * throttle down to incoming reply rate soon enough anyways. */ | |
523 | return number; | |
524 | } | |
525 | ||
99920dc5 | 526 | int w_make_resync_request(struct drbd_work *w, int cancel) |
b411b363 | 527 | { |
00d56944 | 528 | struct drbd_conf *mdev = w->mdev; |
b411b363 PR |
529 | unsigned long bit; |
530 | sector_t sector; | |
531 | const sector_t capacity = drbd_get_capacity(mdev->this_bdev); | |
1816a2b4 | 532 | int max_bio_size; |
e65f440d | 533 | int number, rollback_i, size; |
b411b363 | 534 | int align, queued, sndbuf; |
0f0601f4 | 535 | int i = 0; |
b411b363 PR |
536 | |
537 | if (unlikely(cancel)) | |
99920dc5 | 538 | return 0; |
b411b363 | 539 | |
af85e8e8 LE |
540 | if (mdev->rs_total == 0) { |
541 | /* empty resync? */ | |
542 | drbd_resync_finished(mdev); | |
99920dc5 | 543 | return 0; |
af85e8e8 LE |
544 | } |
545 | ||
b411b363 PR |
546 | if (!get_ldev(mdev)) { |
547 | /* Since we only need to access mdev->rsync a | |
548 | get_ldev_if_state(mdev,D_FAILED) would be sufficient, but | |
549 | to continue resync with a broken disk makes no sense at | |
550 | all */ | |
551 | dev_err(DEV, "Disk broke down during resync!\n"); | |
99920dc5 | 552 | return 0; |
b411b363 PR |
553 | } |
554 | ||
0cfdd247 | 555 | max_bio_size = queue_max_hw_sectors(mdev->rq_queue) << 9; |
e65f440d LE |
556 | number = drbd_rs_number_requests(mdev); |
557 | if (number == 0) | |
0f0601f4 | 558 | goto requeue; |
b411b363 | 559 | |
b411b363 PR |
560 | for (i = 0; i < number; i++) { |
561 | /* Stop generating RS requests, when half of the send buffer is filled */ | |
e42325a5 PR |
562 | mutex_lock(&mdev->tconn->data.mutex); |
563 | if (mdev->tconn->data.socket) { | |
564 | queued = mdev->tconn->data.socket->sk->sk_wmem_queued; | |
565 | sndbuf = mdev->tconn->data.socket->sk->sk_sndbuf; | |
b411b363 PR |
566 | } else { |
567 | queued = 1; | |
568 | sndbuf = 0; | |
569 | } | |
e42325a5 | 570 | mutex_unlock(&mdev->tconn->data.mutex); |
b411b363 PR |
571 | if (queued > sndbuf / 2) |
572 | goto requeue; | |
573 | ||
574 | next_sector: | |
575 | size = BM_BLOCK_SIZE; | |
576 | bit = drbd_bm_find_next(mdev, mdev->bm_resync_fo); | |
577 | ||
4b0715f0 | 578 | if (bit == DRBD_END_OF_BITMAP) { |
b411b363 | 579 | mdev->bm_resync_fo = drbd_bm_bits(mdev); |
b411b363 | 580 | put_ldev(mdev); |
99920dc5 | 581 | return 0; |
b411b363 PR |
582 | } |
583 | ||
584 | sector = BM_BIT_TO_SECT(bit); | |
585 | ||
e3555d85 PR |
586 | if (drbd_rs_should_slow_down(mdev, sector) || |
587 | drbd_try_rs_begin_io(mdev, sector)) { | |
b411b363 PR |
588 | mdev->bm_resync_fo = bit; |
589 | goto requeue; | |
590 | } | |
591 | mdev->bm_resync_fo = bit + 1; | |
592 | ||
593 | if (unlikely(drbd_bm_test_bit(mdev, bit) == 0)) { | |
594 | drbd_rs_complete_io(mdev, sector); | |
595 | goto next_sector; | |
596 | } | |
597 | ||
1816a2b4 | 598 | #if DRBD_MAX_BIO_SIZE > BM_BLOCK_SIZE |
b411b363 PR |
599 | /* try to find some adjacent bits. |
600 | * we stop if we have already the maximum req size. | |
601 | * | |
602 | * Additionally always align bigger requests, in order to | |
603 | * be prepared for all stripe sizes of software RAIDs. | |
b411b363 PR |
604 | */ |
605 | align = 1; | |
d207450c | 606 | rollback_i = i; |
b411b363 | 607 | for (;;) { |
1816a2b4 | 608 | if (size + BM_BLOCK_SIZE > max_bio_size) |
b411b363 PR |
609 | break; |
610 | ||
611 | /* Be always aligned */ | |
612 | if (sector & ((1<<(align+3))-1)) | |
613 | break; | |
614 | ||
615 | /* do not cross extent boundaries */ | |
616 | if (((bit+1) & BM_BLOCKS_PER_BM_EXT_MASK) == 0) | |
617 | break; | |
618 | /* now, is it actually dirty, after all? | |
619 | * caution, drbd_bm_test_bit is tri-state for some | |
620 | * obscure reason; ( b == 0 ) would get the out-of-band | |
621 | * only accidentally right because of the "oddly sized" | |
622 | * adjustment below */ | |
623 | if (drbd_bm_test_bit(mdev, bit+1) != 1) | |
624 | break; | |
625 | bit++; | |
626 | size += BM_BLOCK_SIZE; | |
627 | if ((BM_BLOCK_SIZE << align) <= size) | |
628 | align++; | |
629 | i++; | |
630 | } | |
631 | /* if we merged some, | |
632 | * reset the offset to start the next drbd_bm_find_next from */ | |
633 | if (size > BM_BLOCK_SIZE) | |
634 | mdev->bm_resync_fo = bit + 1; | |
635 | #endif | |
636 | ||
637 | /* adjust very last sectors, in case we are oddly sized */ | |
638 | if (sector + (size>>9) > capacity) | |
639 | size = (capacity-sector)<<9; | |
f399002e | 640 | if (mdev->tconn->agreed_pro_version >= 89 && mdev->tconn->csums_tfm) { |
b411b363 | 641 | switch (read_for_csum(mdev, sector, size)) { |
80a40e43 | 642 | case -EIO: /* Disk failure */ |
b411b363 | 643 | put_ldev(mdev); |
99920dc5 | 644 | return -EIO; |
80a40e43 | 645 | case -EAGAIN: /* allocation failed, or ldev busy */ |
b411b363 PR |
646 | drbd_rs_complete_io(mdev, sector); |
647 | mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); | |
d207450c | 648 | i = rollback_i; |
b411b363 | 649 | goto requeue; |
80a40e43 LE |
650 | case 0: |
651 | /* everything ok */ | |
652 | break; | |
653 | default: | |
654 | BUG(); | |
b411b363 PR |
655 | } |
656 | } else { | |
99920dc5 AG |
657 | int err; |
658 | ||
b411b363 | 659 | inc_rs_pending(mdev); |
99920dc5 AG |
660 | err = drbd_send_drequest(mdev, P_RS_DATA_REQUEST, |
661 | sector, size, ID_SYNCER); | |
662 | if (err) { | |
b411b363 PR |
663 | dev_err(DEV, "drbd_send_drequest() failed, aborting...\n"); |
664 | dec_rs_pending(mdev); | |
665 | put_ldev(mdev); | |
99920dc5 | 666 | return err; |
b411b363 PR |
667 | } |
668 | } | |
669 | } | |
670 | ||
671 | if (mdev->bm_resync_fo >= drbd_bm_bits(mdev)) { | |
672 | /* last syncer _request_ was sent, | |
673 | * but the P_RS_DATA_REPLY not yet received. sync will end (and | |
674 | * next sync group will resume), as soon as we receive the last | |
675 | * resync data block, and the last bit is cleared. | |
676 | * until then resync "work" is "inactive" ... | |
677 | */ | |
b411b363 | 678 | put_ldev(mdev); |
99920dc5 | 679 | return 0; |
b411b363 PR |
680 | } |
681 | ||
682 | requeue: | |
778f271d | 683 | mdev->rs_in_flight += (i << (BM_BLOCK_SHIFT - 9)); |
b411b363 PR |
684 | mod_timer(&mdev->resync_timer, jiffies + SLEEP_TIME); |
685 | put_ldev(mdev); | |
99920dc5 | 686 | return 0; |
b411b363 PR |
687 | } |
688 | ||
00d56944 | 689 | static int w_make_ov_request(struct drbd_work *w, int cancel) |
b411b363 | 690 | { |
00d56944 | 691 | struct drbd_conf *mdev = w->mdev; |
b411b363 PR |
692 | int number, i, size; |
693 | sector_t sector; | |
694 | const sector_t capacity = drbd_get_capacity(mdev->this_bdev); | |
695 | ||
696 | if (unlikely(cancel)) | |
697 | return 1; | |
698 | ||
2649f080 | 699 | number = drbd_rs_number_requests(mdev); |
b411b363 PR |
700 | |
701 | sector = mdev->ov_position; | |
702 | for (i = 0; i < number; i++) { | |
703 | if (sector >= capacity) { | |
b411b363 PR |
704 | return 1; |
705 | } | |
706 | ||
707 | size = BM_BLOCK_SIZE; | |
708 | ||
e3555d85 PR |
709 | if (drbd_rs_should_slow_down(mdev, sector) || |
710 | drbd_try_rs_begin_io(mdev, sector)) { | |
b411b363 PR |
711 | mdev->ov_position = sector; |
712 | goto requeue; | |
713 | } | |
714 | ||
715 | if (sector + (size>>9) > capacity) | |
716 | size = (capacity-sector)<<9; | |
717 | ||
718 | inc_rs_pending(mdev); | |
5b9f499c | 719 | if (drbd_send_ov_request(mdev, sector, size)) { |
b411b363 PR |
720 | dec_rs_pending(mdev); |
721 | return 0; | |
722 | } | |
723 | sector += BM_SECT_PER_BIT; | |
724 | } | |
725 | mdev->ov_position = sector; | |
726 | ||
727 | requeue: | |
2649f080 | 728 | mdev->rs_in_flight += (i << (BM_BLOCK_SHIFT - 9)); |
b411b363 PR |
729 | mod_timer(&mdev->resync_timer, jiffies + SLEEP_TIME); |
730 | return 1; | |
731 | } | |
732 | ||
99920dc5 | 733 | int w_ov_finished(struct drbd_work *w, int cancel) |
b411b363 | 734 | { |
00d56944 | 735 | struct drbd_conf *mdev = w->mdev; |
b411b363 | 736 | kfree(w); |
8f7bed77 | 737 | ov_out_of_sync_print(mdev); |
b411b363 PR |
738 | drbd_resync_finished(mdev); |
739 | ||
99920dc5 | 740 | return 0; |
b411b363 PR |
741 | } |
742 | ||
99920dc5 | 743 | static int w_resync_finished(struct drbd_work *w, int cancel) |
b411b363 | 744 | { |
00d56944 | 745 | struct drbd_conf *mdev = w->mdev; |
b411b363 PR |
746 | kfree(w); |
747 | ||
748 | drbd_resync_finished(mdev); | |
749 | ||
99920dc5 | 750 | return 0; |
b411b363 PR |
751 | } |
752 | ||
af85e8e8 LE |
753 | static void ping_peer(struct drbd_conf *mdev) |
754 | { | |
2a67d8b9 PR |
755 | struct drbd_tconn *tconn = mdev->tconn; |
756 | ||
757 | clear_bit(GOT_PING_ACK, &tconn->flags); | |
758 | request_ping(tconn); | |
759 | wait_event(tconn->ping_wait, | |
760 | test_bit(GOT_PING_ACK, &tconn->flags) || mdev->state.conn < C_CONNECTED); | |
af85e8e8 LE |
761 | } |
762 | ||
b411b363 PR |
763 | int drbd_resync_finished(struct drbd_conf *mdev) |
764 | { | |
765 | unsigned long db, dt, dbdt; | |
766 | unsigned long n_oos; | |
767 | union drbd_state os, ns; | |
768 | struct drbd_work *w; | |
769 | char *khelper_cmd = NULL; | |
26525618 | 770 | int verify_done = 0; |
b411b363 PR |
771 | |
772 | /* Remove all elements from the resync LRU. Since future actions | |
773 | * might set bits in the (main) bitmap, then the entries in the | |
774 | * resync LRU would be wrong. */ | |
775 | if (drbd_rs_del_all(mdev)) { | |
776 | /* In case this is not possible now, most probably because | |
777 | * there are P_RS_DATA_REPLY Packets lingering on the worker's | |
778 | * queue (or even the read operations for those packets | |
779 | * is not finished by now). Retry in 100ms. */ | |
780 | ||
20ee6390 | 781 | schedule_timeout_interruptible(HZ / 10); |
b411b363 PR |
782 | w = kmalloc(sizeof(struct drbd_work), GFP_ATOMIC); |
783 | if (w) { | |
784 | w->cb = w_resync_finished; | |
9b743da9 | 785 | w->mdev = mdev; |
d5b27b01 | 786 | drbd_queue_work(&mdev->tconn->sender_work, w); |
b411b363 PR |
787 | return 1; |
788 | } | |
789 | dev_err(DEV, "Warn failed to drbd_rs_del_all() and to kmalloc(w).\n"); | |
790 | } | |
791 | ||
792 | dt = (jiffies - mdev->rs_start - mdev->rs_paused) / HZ; | |
793 | if (dt <= 0) | |
794 | dt = 1; | |
795 | db = mdev->rs_total; | |
796 | dbdt = Bit2KB(db/dt); | |
797 | mdev->rs_paused /= HZ; | |
798 | ||
799 | if (!get_ldev(mdev)) | |
800 | goto out; | |
801 | ||
af85e8e8 LE |
802 | ping_peer(mdev); |
803 | ||
87eeee41 | 804 | spin_lock_irq(&mdev->tconn->req_lock); |
78bae59b | 805 | os = drbd_read_state(mdev); |
b411b363 | 806 | |
26525618 LE |
807 | verify_done = (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T); |
808 | ||
b411b363 PR |
809 | /* This protects us against multiple calls (that can happen in the presence |
810 | of application IO), and against connectivity loss just before we arrive here. */ | |
811 | if (os.conn <= C_CONNECTED) | |
812 | goto out_unlock; | |
813 | ||
814 | ns = os; | |
815 | ns.conn = C_CONNECTED; | |
816 | ||
817 | dev_info(DEV, "%s done (total %lu sec; paused %lu sec; %lu K/sec)\n", | |
26525618 | 818 | verify_done ? "Online verify " : "Resync", |
b411b363 PR |
819 | dt + mdev->rs_paused, mdev->rs_paused, dbdt); |
820 | ||
821 | n_oos = drbd_bm_total_weight(mdev); | |
822 | ||
823 | if (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) { | |
824 | if (n_oos) { | |
825 | dev_alert(DEV, "Online verify found %lu %dk block out of sync!\n", | |
826 | n_oos, Bit2KB(1)); | |
827 | khelper_cmd = "out-of-sync"; | |
828 | } | |
829 | } else { | |
830 | D_ASSERT((n_oos - mdev->rs_failed) == 0); | |
831 | ||
832 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) | |
833 | khelper_cmd = "after-resync-target"; | |
834 | ||
f399002e | 835 | if (mdev->tconn->csums_tfm && mdev->rs_total) { |
b411b363 PR |
836 | const unsigned long s = mdev->rs_same_csum; |
837 | const unsigned long t = mdev->rs_total; | |
838 | const int ratio = | |
839 | (t == 0) ? 0 : | |
840 | (t < 100000) ? ((s*100)/t) : (s/(t/100)); | |
24c4830c | 841 | dev_info(DEV, "%u %% had equal checksums, eliminated: %luK; " |
b411b363 PR |
842 | "transferred %luK total %luK\n", |
843 | ratio, | |
844 | Bit2KB(mdev->rs_same_csum), | |
845 | Bit2KB(mdev->rs_total - mdev->rs_same_csum), | |
846 | Bit2KB(mdev->rs_total)); | |
847 | } | |
848 | } | |
849 | ||
850 | if (mdev->rs_failed) { | |
851 | dev_info(DEV, " %lu failed blocks\n", mdev->rs_failed); | |
852 | ||
853 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) { | |
854 | ns.disk = D_INCONSISTENT; | |
855 | ns.pdsk = D_UP_TO_DATE; | |
856 | } else { | |
857 | ns.disk = D_UP_TO_DATE; | |
858 | ns.pdsk = D_INCONSISTENT; | |
859 | } | |
860 | } else { | |
861 | ns.disk = D_UP_TO_DATE; | |
862 | ns.pdsk = D_UP_TO_DATE; | |
863 | ||
864 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) { | |
865 | if (mdev->p_uuid) { | |
866 | int i; | |
867 | for (i = UI_BITMAP ; i <= UI_HISTORY_END ; i++) | |
868 | _drbd_uuid_set(mdev, i, mdev->p_uuid[i]); | |
869 | drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_CURRENT]); | |
870 | _drbd_uuid_set(mdev, UI_CURRENT, mdev->p_uuid[UI_CURRENT]); | |
871 | } else { | |
872 | dev_err(DEV, "mdev->p_uuid is NULL! BUG\n"); | |
873 | } | |
874 | } | |
875 | ||
62b0da3a LE |
876 | if (!(os.conn == C_VERIFY_S || os.conn == C_VERIFY_T)) { |
877 | /* for verify runs, we don't update uuids here, | |
878 | * so there would be nothing to report. */ | |
879 | drbd_uuid_set_bm(mdev, 0UL); | |
880 | drbd_print_uuids(mdev, "updated UUIDs"); | |
881 | if (mdev->p_uuid) { | |
882 | /* Now the two UUID sets are equal, update what we | |
883 | * know of the peer. */ | |
884 | int i; | |
885 | for (i = UI_CURRENT ; i <= UI_HISTORY_END ; i++) | |
886 | mdev->p_uuid[i] = mdev->ldev->md.uuid[i]; | |
887 | } | |
b411b363 PR |
888 | } |
889 | } | |
890 | ||
891 | _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); | |
892 | out_unlock: | |
87eeee41 | 893 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
894 | put_ldev(mdev); |
895 | out: | |
896 | mdev->rs_total = 0; | |
897 | mdev->rs_failed = 0; | |
898 | mdev->rs_paused = 0; | |
26525618 LE |
899 | if (verify_done) |
900 | mdev->ov_start_sector = 0; | |
b411b363 | 901 | |
13d42685 LE |
902 | drbd_md_sync(mdev); |
903 | ||
b411b363 PR |
904 | if (khelper_cmd) |
905 | drbd_khelper(mdev, khelper_cmd); | |
906 | ||
907 | return 1; | |
908 | } | |
909 | ||
910 | /* helper */ | |
db830c46 | 911 | static void move_to_net_ee_or_free(struct drbd_conf *mdev, struct drbd_peer_request *peer_req) |
b411b363 | 912 | { |
045417f7 | 913 | if (drbd_peer_req_has_active_page(peer_req)) { |
b411b363 | 914 | /* This might happen if sendpage() has not finished */ |
db830c46 | 915 | int i = (peer_req->i.size + PAGE_SIZE -1) >> PAGE_SHIFT; |
435f0740 LE |
916 | atomic_add(i, &mdev->pp_in_use_by_net); |
917 | atomic_sub(i, &mdev->pp_in_use); | |
87eeee41 | 918 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 | 919 | list_add_tail(&peer_req->w.list, &mdev->net_ee); |
87eeee41 | 920 | spin_unlock_irq(&mdev->tconn->req_lock); |
435f0740 | 921 | wake_up(&drbd_pp_wait); |
b411b363 | 922 | } else |
3967deb1 | 923 | drbd_free_peer_req(mdev, peer_req); |
b411b363 PR |
924 | } |
925 | ||
926 | /** | |
927 | * w_e_end_data_req() - Worker callback, to send a P_DATA_REPLY packet in response to a P_DATA_REQUEST | |
928 | * @mdev: DRBD device. | |
929 | * @w: work object. | |
930 | * @cancel: The connection will be closed anyways | |
931 | */ | |
99920dc5 | 932 | int w_e_end_data_req(struct drbd_work *w, int cancel) |
b411b363 | 933 | { |
db830c46 | 934 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
00d56944 | 935 | struct drbd_conf *mdev = w->mdev; |
99920dc5 | 936 | int err; |
b411b363 PR |
937 | |
938 | if (unlikely(cancel)) { | |
3967deb1 | 939 | drbd_free_peer_req(mdev, peer_req); |
b411b363 | 940 | dec_unacked(mdev); |
99920dc5 | 941 | return 0; |
b411b363 PR |
942 | } |
943 | ||
db830c46 | 944 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
99920dc5 | 945 | err = drbd_send_block(mdev, P_DATA_REPLY, peer_req); |
b411b363 PR |
946 | } else { |
947 | if (__ratelimit(&drbd_ratelimit_state)) | |
948 | dev_err(DEV, "Sending NegDReply. sector=%llus.\n", | |
db830c46 | 949 | (unsigned long long)peer_req->i.sector); |
b411b363 | 950 | |
99920dc5 | 951 | err = drbd_send_ack(mdev, P_NEG_DREPLY, peer_req); |
b411b363 PR |
952 | } |
953 | ||
954 | dec_unacked(mdev); | |
955 | ||
db830c46 | 956 | move_to_net_ee_or_free(mdev, peer_req); |
b411b363 | 957 | |
99920dc5 | 958 | if (unlikely(err)) |
b411b363 | 959 | dev_err(DEV, "drbd_send_block() failed\n"); |
99920dc5 | 960 | return err; |
b411b363 PR |
961 | } |
962 | ||
963 | /** | |
a209b4ae | 964 | * w_e_end_rsdata_req() - Worker callback to send a P_RS_DATA_REPLY packet in response to a P_RS_DATA_REQUEST |
b411b363 PR |
965 | * @mdev: DRBD device. |
966 | * @w: work object. | |
967 | * @cancel: The connection will be closed anyways | |
968 | */ | |
99920dc5 | 969 | int w_e_end_rsdata_req(struct drbd_work *w, int cancel) |
b411b363 | 970 | { |
db830c46 | 971 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
00d56944 | 972 | struct drbd_conf *mdev = w->mdev; |
99920dc5 | 973 | int err; |
b411b363 PR |
974 | |
975 | if (unlikely(cancel)) { | |
3967deb1 | 976 | drbd_free_peer_req(mdev, peer_req); |
b411b363 | 977 | dec_unacked(mdev); |
99920dc5 | 978 | return 0; |
b411b363 PR |
979 | } |
980 | ||
981 | if (get_ldev_if_state(mdev, D_FAILED)) { | |
db830c46 | 982 | drbd_rs_complete_io(mdev, peer_req->i.sector); |
b411b363 PR |
983 | put_ldev(mdev); |
984 | } | |
985 | ||
d612d309 | 986 | if (mdev->state.conn == C_AHEAD) { |
99920dc5 | 987 | err = drbd_send_ack(mdev, P_RS_CANCEL, peer_req); |
db830c46 | 988 | } else if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
989 | if (likely(mdev->state.pdsk >= D_INCONSISTENT)) { |
990 | inc_rs_pending(mdev); | |
99920dc5 | 991 | err = drbd_send_block(mdev, P_RS_DATA_REPLY, peer_req); |
b411b363 PR |
992 | } else { |
993 | if (__ratelimit(&drbd_ratelimit_state)) | |
994 | dev_err(DEV, "Not sending RSDataReply, " | |
995 | "partner DISKLESS!\n"); | |
99920dc5 | 996 | err = 0; |
b411b363 PR |
997 | } |
998 | } else { | |
999 | if (__ratelimit(&drbd_ratelimit_state)) | |
1000 | dev_err(DEV, "Sending NegRSDReply. sector %llus.\n", | |
db830c46 | 1001 | (unsigned long long)peer_req->i.sector); |
b411b363 | 1002 | |
99920dc5 | 1003 | err = drbd_send_ack(mdev, P_NEG_RS_DREPLY, peer_req); |
b411b363 PR |
1004 | |
1005 | /* update resync data with failure */ | |
db830c46 | 1006 | drbd_rs_failed_io(mdev, peer_req->i.sector, peer_req->i.size); |
b411b363 PR |
1007 | } |
1008 | ||
1009 | dec_unacked(mdev); | |
1010 | ||
db830c46 | 1011 | move_to_net_ee_or_free(mdev, peer_req); |
b411b363 | 1012 | |
99920dc5 | 1013 | if (unlikely(err)) |
b411b363 | 1014 | dev_err(DEV, "drbd_send_block() failed\n"); |
99920dc5 | 1015 | return err; |
b411b363 PR |
1016 | } |
1017 | ||
99920dc5 | 1018 | int w_e_end_csum_rs_req(struct drbd_work *w, int cancel) |
b411b363 | 1019 | { |
db830c46 | 1020 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
00d56944 | 1021 | struct drbd_conf *mdev = w->mdev; |
b411b363 PR |
1022 | struct digest_info *di; |
1023 | int digest_size; | |
1024 | void *digest = NULL; | |
99920dc5 | 1025 | int err, eq = 0; |
b411b363 PR |
1026 | |
1027 | if (unlikely(cancel)) { | |
3967deb1 | 1028 | drbd_free_peer_req(mdev, peer_req); |
b411b363 | 1029 | dec_unacked(mdev); |
99920dc5 | 1030 | return 0; |
b411b363 PR |
1031 | } |
1032 | ||
1d53f09e | 1033 | if (get_ldev(mdev)) { |
db830c46 | 1034 | drbd_rs_complete_io(mdev, peer_req->i.sector); |
1d53f09e LE |
1035 | put_ldev(mdev); |
1036 | } | |
b411b363 | 1037 | |
db830c46 | 1038 | di = peer_req->digest; |
b411b363 | 1039 | |
db830c46 | 1040 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
1041 | /* quick hack to try to avoid a race against reconfiguration. |
1042 | * a real fix would be much more involved, | |
1043 | * introducing more locking mechanisms */ | |
f399002e LE |
1044 | if (mdev->tconn->csums_tfm) { |
1045 | digest_size = crypto_hash_digestsize(mdev->tconn->csums_tfm); | |
b411b363 PR |
1046 | D_ASSERT(digest_size == di->digest_size); |
1047 | digest = kmalloc(digest_size, GFP_NOIO); | |
1048 | } | |
1049 | if (digest) { | |
f399002e | 1050 | drbd_csum_ee(mdev, mdev->tconn->csums_tfm, peer_req, digest); |
b411b363 PR |
1051 | eq = !memcmp(digest, di->digest, digest_size); |
1052 | kfree(digest); | |
1053 | } | |
1054 | ||
1055 | if (eq) { | |
db830c46 | 1056 | drbd_set_in_sync(mdev, peer_req->i.sector, peer_req->i.size); |
676396d5 | 1057 | /* rs_same_csums unit is BM_BLOCK_SIZE */ |
db830c46 | 1058 | mdev->rs_same_csum += peer_req->i.size >> BM_BLOCK_SHIFT; |
99920dc5 | 1059 | err = drbd_send_ack(mdev, P_RS_IS_IN_SYNC, peer_req); |
b411b363 PR |
1060 | } else { |
1061 | inc_rs_pending(mdev); | |
db830c46 AG |
1062 | peer_req->block_id = ID_SYNCER; /* By setting block_id, digest pointer becomes invalid! */ |
1063 | peer_req->flags &= ~EE_HAS_DIGEST; /* This peer request no longer has a digest pointer */ | |
204bba99 | 1064 | kfree(di); |
99920dc5 | 1065 | err = drbd_send_block(mdev, P_RS_DATA_REPLY, peer_req); |
b411b363 PR |
1066 | } |
1067 | } else { | |
99920dc5 | 1068 | err = drbd_send_ack(mdev, P_NEG_RS_DREPLY, peer_req); |
b411b363 PR |
1069 | if (__ratelimit(&drbd_ratelimit_state)) |
1070 | dev_err(DEV, "Sending NegDReply. I guess it gets messy.\n"); | |
1071 | } | |
1072 | ||
1073 | dec_unacked(mdev); | |
db830c46 | 1074 | move_to_net_ee_or_free(mdev, peer_req); |
b411b363 | 1075 | |
99920dc5 | 1076 | if (unlikely(err)) |
b411b363 | 1077 | dev_err(DEV, "drbd_send_block/ack() failed\n"); |
99920dc5 | 1078 | return err; |
b411b363 PR |
1079 | } |
1080 | ||
99920dc5 | 1081 | int w_e_end_ov_req(struct drbd_work *w, int cancel) |
b411b363 | 1082 | { |
db830c46 | 1083 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
00d56944 | 1084 | struct drbd_conf *mdev = w->mdev; |
db830c46 AG |
1085 | sector_t sector = peer_req->i.sector; |
1086 | unsigned int size = peer_req->i.size; | |
b411b363 PR |
1087 | int digest_size; |
1088 | void *digest; | |
99920dc5 | 1089 | int err = 0; |
b411b363 PR |
1090 | |
1091 | if (unlikely(cancel)) | |
1092 | goto out; | |
1093 | ||
f399002e | 1094 | digest_size = crypto_hash_digestsize(mdev->tconn->verify_tfm); |
b411b363 | 1095 | digest = kmalloc(digest_size, GFP_NOIO); |
8f21420e | 1096 | if (!digest) { |
99920dc5 | 1097 | err = 1; /* terminate the connection in case the allocation failed */ |
8f21420e | 1098 | goto out; |
b411b363 PR |
1099 | } |
1100 | ||
db830c46 | 1101 | if (likely(!(peer_req->flags & EE_WAS_ERROR))) |
f399002e | 1102 | drbd_csum_ee(mdev, mdev->tconn->verify_tfm, peer_req, digest); |
8f21420e PR |
1103 | else |
1104 | memset(digest, 0, digest_size); | |
1105 | ||
53ea4331 LE |
1106 | /* Free e and pages before send. |
1107 | * In case we block on congestion, we could otherwise run into | |
1108 | * some distributed deadlock, if the other side blocks on | |
1109 | * congestion as well, because our receiver blocks in | |
c37c8ecf | 1110 | * drbd_alloc_pages due to pp_in_use > max_buffers. */ |
3967deb1 | 1111 | drbd_free_peer_req(mdev, peer_req); |
db830c46 | 1112 | peer_req = NULL; |
8f21420e | 1113 | inc_rs_pending(mdev); |
99920dc5 AG |
1114 | err = drbd_send_drequest_csum(mdev, sector, size, digest, digest_size, P_OV_REPLY); |
1115 | if (err) | |
8f21420e PR |
1116 | dec_rs_pending(mdev); |
1117 | kfree(digest); | |
1118 | ||
b411b363 | 1119 | out: |
db830c46 | 1120 | if (peer_req) |
3967deb1 | 1121 | drbd_free_peer_req(mdev, peer_req); |
b411b363 | 1122 | dec_unacked(mdev); |
99920dc5 | 1123 | return err; |
b411b363 PR |
1124 | } |
1125 | ||
8f7bed77 | 1126 | void drbd_ov_out_of_sync_found(struct drbd_conf *mdev, sector_t sector, int size) |
b411b363 PR |
1127 | { |
1128 | if (mdev->ov_last_oos_start + mdev->ov_last_oos_size == sector) { | |
1129 | mdev->ov_last_oos_size += size>>9; | |
1130 | } else { | |
1131 | mdev->ov_last_oos_start = sector; | |
1132 | mdev->ov_last_oos_size = size>>9; | |
1133 | } | |
1134 | drbd_set_out_of_sync(mdev, sector, size); | |
b411b363 PR |
1135 | } |
1136 | ||
99920dc5 | 1137 | int w_e_end_ov_reply(struct drbd_work *w, int cancel) |
b411b363 | 1138 | { |
db830c46 | 1139 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
00d56944 | 1140 | struct drbd_conf *mdev = w->mdev; |
b411b363 | 1141 | struct digest_info *di; |
b411b363 | 1142 | void *digest; |
db830c46 AG |
1143 | sector_t sector = peer_req->i.sector; |
1144 | unsigned int size = peer_req->i.size; | |
53ea4331 | 1145 | int digest_size; |
99920dc5 | 1146 | int err, eq = 0; |
b411b363 PR |
1147 | |
1148 | if (unlikely(cancel)) { | |
3967deb1 | 1149 | drbd_free_peer_req(mdev, peer_req); |
b411b363 | 1150 | dec_unacked(mdev); |
99920dc5 | 1151 | return 0; |
b411b363 PR |
1152 | } |
1153 | ||
1154 | /* after "cancel", because after drbd_disconnect/drbd_rs_cancel_all | |
1155 | * the resync lru has been cleaned up already */ | |
1d53f09e | 1156 | if (get_ldev(mdev)) { |
db830c46 | 1157 | drbd_rs_complete_io(mdev, peer_req->i.sector); |
1d53f09e LE |
1158 | put_ldev(mdev); |
1159 | } | |
b411b363 | 1160 | |
db830c46 | 1161 | di = peer_req->digest; |
b411b363 | 1162 | |
db830c46 | 1163 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
f399002e | 1164 | digest_size = crypto_hash_digestsize(mdev->tconn->verify_tfm); |
b411b363 PR |
1165 | digest = kmalloc(digest_size, GFP_NOIO); |
1166 | if (digest) { | |
f399002e | 1167 | drbd_csum_ee(mdev, mdev->tconn->verify_tfm, peer_req, 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 | ||
9676c760 LE |
1175 | /* Free peer_req 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 | |
c37c8ecf | 1179 | * drbd_alloc_pages due to pp_in_use > max_buffers. */ |
3967deb1 | 1180 | drbd_free_peer_req(mdev, peer_req); |
b411b363 | 1181 | if (!eq) |
8f7bed77 | 1182 | drbd_ov_out_of_sync_found(mdev, sector, size); |
b411b363 | 1183 | else |
8f7bed77 | 1184 | ov_out_of_sync_print(mdev); |
b411b363 | 1185 | |
99920dc5 | 1186 | err = drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, |
fa79abd8 | 1187 | eq ? ID_IN_SYNC : ID_OUT_OF_SYNC); |
b411b363 | 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) { | |
8f7bed77 | 1198 | ov_out_of_sync_print(mdev); |
b411b363 PR |
1199 | drbd_resync_finished(mdev); |
1200 | } | |
1201 | ||
99920dc5 | 1202 | return err; |
b411b363 PR |
1203 | } |
1204 | ||
99920dc5 | 1205 | int w_prev_work_done(struct drbd_work *w, int cancel) |
b411b363 PR |
1206 | { |
1207 | struct drbd_wq_barrier *b = container_of(w, struct drbd_wq_barrier, w); | |
00d56944 | 1208 | |
b411b363 | 1209 | complete(&b->done); |
99920dc5 | 1210 | return 0; |
b411b363 PR |
1211 | } |
1212 | ||
99920dc5 | 1213 | int w_send_barrier(struct drbd_work *w, int cancel) |
b411b363 | 1214 | { |
9f5bdc33 | 1215 | struct drbd_socket *sock; |
b411b363 | 1216 | struct drbd_tl_epoch *b = container_of(w, struct drbd_tl_epoch, w); |
00d56944 | 1217 | struct drbd_conf *mdev = w->mdev; |
9f5bdc33 | 1218 | struct p_barrier *p; |
b411b363 PR |
1219 | |
1220 | /* really avoid racing with tl_clear. w.cb may have been referenced | |
1221 | * just before it was reassigned and re-queued, so double check that. | |
1222 | * actually, this race was harmless, since we only try to send the | |
1223 | * barrier packet here, and otherwise do nothing with the object. | |
1224 | * but compare with the head of w_clear_epoch */ | |
87eeee41 | 1225 | spin_lock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
1226 | if (w->cb != w_send_barrier || mdev->state.conn < C_CONNECTED) |
1227 | cancel = 1; | |
87eeee41 | 1228 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 1229 | if (cancel) |
b411b363 | 1230 | return 0; |
99920dc5 | 1231 | |
9f5bdc33 AG |
1232 | sock = &mdev->tconn->data; |
1233 | p = drbd_prepare_command(mdev, sock); | |
1234 | if (!p) | |
1235 | return -EIO; | |
b411b363 PR |
1236 | p->barrier = b->br_number; |
1237 | /* inc_ap_pending was done where this was queued. | |
1238 | * dec_ap_pending will be done in got_BarrierAck | |
1239 | * or (on connection loss) in w_clear_epoch. */ | |
9f5bdc33 | 1240 | return drbd_send_command(mdev, sock, P_BARRIER, sizeof(*p), NULL, 0); |
b411b363 PR |
1241 | } |
1242 | ||
99920dc5 | 1243 | int w_send_write_hint(struct drbd_work *w, int cancel) |
b411b363 | 1244 | { |
00d56944 | 1245 | struct drbd_conf *mdev = w->mdev; |
9f5bdc33 AG |
1246 | struct drbd_socket *sock; |
1247 | ||
b411b363 | 1248 | if (cancel) |
99920dc5 | 1249 | return 0; |
9f5bdc33 AG |
1250 | sock = &mdev->tconn->data; |
1251 | if (!drbd_prepare_command(mdev, sock)) | |
1252 | return -EIO; | |
e658983a | 1253 | return drbd_send_command(mdev, sock, P_UNPLUG_REMOTE, 0, NULL, 0); |
b411b363 PR |
1254 | } |
1255 | ||
8f7bed77 | 1256 | int w_send_out_of_sync(struct drbd_work *w, int cancel) |
73a01a18 PR |
1257 | { |
1258 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
00d56944 | 1259 | struct drbd_conf *mdev = w->mdev; |
99920dc5 | 1260 | int err; |
73a01a18 PR |
1261 | |
1262 | if (unlikely(cancel)) { | |
8554df1c | 1263 | req_mod(req, SEND_CANCELED); |
99920dc5 | 1264 | return 0; |
73a01a18 PR |
1265 | } |
1266 | ||
8f7bed77 | 1267 | err = drbd_send_out_of_sync(mdev, req); |
8554df1c | 1268 | req_mod(req, OOS_HANDED_TO_NETWORK); |
73a01a18 | 1269 | |
99920dc5 | 1270 | return err; |
73a01a18 PR |
1271 | } |
1272 | ||
b411b363 PR |
1273 | /** |
1274 | * w_send_dblock() - Worker callback to send a P_DATA packet in order to mirror a write request | |
1275 | * @mdev: DRBD device. | |
1276 | * @w: work object. | |
1277 | * @cancel: The connection will be closed anyways | |
1278 | */ | |
99920dc5 | 1279 | int w_send_dblock(struct drbd_work *w, int cancel) |
b411b363 PR |
1280 | { |
1281 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
00d56944 | 1282 | struct drbd_conf *mdev = w->mdev; |
99920dc5 | 1283 | int err; |
b411b363 PR |
1284 | |
1285 | if (unlikely(cancel)) { | |
8554df1c | 1286 | req_mod(req, SEND_CANCELED); |
99920dc5 | 1287 | return 0; |
b411b363 PR |
1288 | } |
1289 | ||
99920dc5 AG |
1290 | err = drbd_send_dblock(mdev, req); |
1291 | req_mod(req, err ? SEND_FAILED : HANDED_OVER_TO_NETWORK); | |
b411b363 | 1292 | |
99920dc5 | 1293 | return err; |
b411b363 PR |
1294 | } |
1295 | ||
1296 | /** | |
1297 | * w_send_read_req() - Worker callback to send a read request (P_DATA_REQUEST) packet | |
1298 | * @mdev: DRBD device. | |
1299 | * @w: work object. | |
1300 | * @cancel: The connection will be closed anyways | |
1301 | */ | |
99920dc5 | 1302 | int w_send_read_req(struct drbd_work *w, int cancel) |
b411b363 PR |
1303 | { |
1304 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
00d56944 | 1305 | struct drbd_conf *mdev = w->mdev; |
99920dc5 | 1306 | int err; |
b411b363 PR |
1307 | |
1308 | if (unlikely(cancel)) { | |
8554df1c | 1309 | req_mod(req, SEND_CANCELED); |
99920dc5 | 1310 | return 0; |
b411b363 PR |
1311 | } |
1312 | ||
99920dc5 | 1313 | err = drbd_send_drequest(mdev, P_DATA_REQUEST, req->i.sector, req->i.size, |
6c1005e7 | 1314 | (unsigned long)req); |
b411b363 | 1315 | |
99920dc5 | 1316 | req_mod(req, err ? SEND_FAILED : HANDED_OVER_TO_NETWORK); |
b411b363 | 1317 | |
99920dc5 | 1318 | return err; |
b411b363 PR |
1319 | } |
1320 | ||
99920dc5 | 1321 | int w_restart_disk_io(struct drbd_work *w, int cancel) |
265be2d0 PR |
1322 | { |
1323 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
00d56944 | 1324 | struct drbd_conf *mdev = w->mdev; |
265be2d0 | 1325 | |
0778286a | 1326 | if (bio_data_dir(req->master_bio) == WRITE && req->rq_state & RQ_IN_ACT_LOG) |
181286ad | 1327 | drbd_al_begin_io(mdev, &req->i); |
265be2d0 PR |
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 | ||
99920dc5 | 1333 | return 0; |
265be2d0 PR |
1334 | } |
1335 | ||
b411b363 PR |
1336 | static int _drbd_may_sync_now(struct drbd_conf *mdev) |
1337 | { | |
1338 | struct drbd_conf *odev = mdev; | |
95f8efd0 | 1339 | int resync_after; |
b411b363 PR |
1340 | |
1341 | while (1) { | |
438c8374 PR |
1342 | if (!odev->ldev) |
1343 | return 1; | |
daeda1cc | 1344 | rcu_read_lock(); |
95f8efd0 | 1345 | resync_after = rcu_dereference(odev->ldev->disk_conf)->resync_after; |
daeda1cc | 1346 | rcu_read_unlock(); |
95f8efd0 | 1347 | if (resync_after == -1) |
b411b363 | 1348 | return 1; |
95f8efd0 | 1349 | odev = minor_to_mdev(resync_after); |
841ce241 AG |
1350 | if (!expect(odev)) |
1351 | return 1; | |
b411b363 PR |
1352 | if ((odev->state.conn >= C_SYNC_SOURCE && |
1353 | odev->state.conn <= C_PAUSED_SYNC_T) || | |
1354 | odev->state.aftr_isp || odev->state.peer_isp || | |
1355 | odev->state.user_isp) | |
1356 | return 0; | |
1357 | } | |
1358 | } | |
1359 | ||
1360 | /** | |
1361 | * _drbd_pause_after() - Pause resync on all devices that may not resync now | |
1362 | * @mdev: DRBD device. | |
1363 | * | |
1364 | * Called from process context only (admin command and after_state_ch). | |
1365 | */ | |
1366 | static int _drbd_pause_after(struct drbd_conf *mdev) | |
1367 | { | |
1368 | struct drbd_conf *odev; | |
1369 | int i, rv = 0; | |
1370 | ||
695d08fa | 1371 | rcu_read_lock(); |
81a5d60e | 1372 | idr_for_each_entry(&minors, odev, i) { |
b411b363 PR |
1373 | if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS) |
1374 | continue; | |
1375 | if (!_drbd_may_sync_now(odev)) | |
1376 | rv |= (__drbd_set_state(_NS(odev, aftr_isp, 1), CS_HARD, NULL) | |
1377 | != SS_NOTHING_TO_DO); | |
1378 | } | |
695d08fa | 1379 | rcu_read_unlock(); |
b411b363 PR |
1380 | |
1381 | return rv; | |
1382 | } | |
1383 | ||
1384 | /** | |
1385 | * _drbd_resume_next() - Resume resync on all devices that may resync now | |
1386 | * @mdev: DRBD device. | |
1387 | * | |
1388 | * Called from process context only (admin command and worker). | |
1389 | */ | |
1390 | static int _drbd_resume_next(struct drbd_conf *mdev) | |
1391 | { | |
1392 | struct drbd_conf *odev; | |
1393 | int i, rv = 0; | |
1394 | ||
695d08fa | 1395 | rcu_read_lock(); |
81a5d60e | 1396 | idr_for_each_entry(&minors, odev, i) { |
b411b363 PR |
1397 | if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS) |
1398 | continue; | |
1399 | if (odev->state.aftr_isp) { | |
1400 | if (_drbd_may_sync_now(odev)) | |
1401 | rv |= (__drbd_set_state(_NS(odev, aftr_isp, 0), | |
1402 | CS_HARD, NULL) | |
1403 | != SS_NOTHING_TO_DO) ; | |
1404 | } | |
1405 | } | |
695d08fa | 1406 | rcu_read_unlock(); |
b411b363 PR |
1407 | return rv; |
1408 | } | |
1409 | ||
1410 | void resume_next_sg(struct drbd_conf *mdev) | |
1411 | { | |
1412 | write_lock_irq(&global_state_lock); | |
1413 | _drbd_resume_next(mdev); | |
1414 | write_unlock_irq(&global_state_lock); | |
1415 | } | |
1416 | ||
1417 | void suspend_other_sg(struct drbd_conf *mdev) | |
1418 | { | |
1419 | write_lock_irq(&global_state_lock); | |
1420 | _drbd_pause_after(mdev); | |
1421 | write_unlock_irq(&global_state_lock); | |
1422 | } | |
1423 | ||
dc97b708 | 1424 | /* caller must hold global_state_lock */ |
95f8efd0 | 1425 | enum drbd_ret_code drbd_resync_after_valid(struct drbd_conf *mdev, int o_minor) |
b411b363 PR |
1426 | { |
1427 | struct drbd_conf *odev; | |
95f8efd0 | 1428 | int resync_after; |
b411b363 PR |
1429 | |
1430 | if (o_minor == -1) | |
1431 | return NO_ERROR; | |
1432 | if (o_minor < -1 || minor_to_mdev(o_minor) == NULL) | |
95f8efd0 | 1433 | return ERR_RESYNC_AFTER; |
b411b363 PR |
1434 | |
1435 | /* check for loops */ | |
1436 | odev = minor_to_mdev(o_minor); | |
1437 | while (1) { | |
1438 | if (odev == mdev) | |
95f8efd0 | 1439 | return ERR_RESYNC_AFTER_CYCLE; |
b411b363 | 1440 | |
daeda1cc | 1441 | rcu_read_lock(); |
95f8efd0 | 1442 | resync_after = rcu_dereference(odev->ldev->disk_conf)->resync_after; |
daeda1cc | 1443 | rcu_read_unlock(); |
b411b363 | 1444 | /* dependency chain ends here, no cycles. */ |
95f8efd0 | 1445 | if (resync_after == -1) |
b411b363 PR |
1446 | return NO_ERROR; |
1447 | ||
1448 | /* follow the dependency chain */ | |
95f8efd0 | 1449 | odev = minor_to_mdev(resync_after); |
b411b363 PR |
1450 | } |
1451 | } | |
1452 | ||
dc97b708 | 1453 | /* caller must hold global_state_lock */ |
95f8efd0 | 1454 | void drbd_resync_after_changed(struct drbd_conf *mdev) |
b411b363 PR |
1455 | { |
1456 | int changes; | |
b411b363 | 1457 | |
dc97b708 PR |
1458 | do { |
1459 | changes = _drbd_pause_after(mdev); | |
1460 | changes |= _drbd_resume_next(mdev); | |
1461 | } while (changes); | |
b411b363 PR |
1462 | } |
1463 | ||
9bd28d3c LE |
1464 | void drbd_rs_controller_reset(struct drbd_conf *mdev) |
1465 | { | |
813472ce PR |
1466 | struct fifo_buffer *plan; |
1467 | ||
9bd28d3c LE |
1468 | atomic_set(&mdev->rs_sect_in, 0); |
1469 | atomic_set(&mdev->rs_sect_ev, 0); | |
1470 | mdev->rs_in_flight = 0; | |
813472ce PR |
1471 | |
1472 | /* Updating the RCU protected object in place is necessary since | |
1473 | this function gets called from atomic context. | |
1474 | It is valid since all other updates also lead to an completely | |
1475 | empty fifo */ | |
1476 | rcu_read_lock(); | |
1477 | plan = rcu_dereference(mdev->rs_plan_s); | |
1478 | plan->total = 0; | |
1479 | fifo_set(plan, 0); | |
1480 | rcu_read_unlock(); | |
9bd28d3c LE |
1481 | } |
1482 | ||
1f04af33 PR |
1483 | void start_resync_timer_fn(unsigned long data) |
1484 | { | |
1485 | struct drbd_conf *mdev = (struct drbd_conf *) data; | |
1486 | ||
d5b27b01 | 1487 | drbd_queue_work(&mdev->tconn->sender_work, &mdev->start_resync_work); |
1f04af33 PR |
1488 | } |
1489 | ||
99920dc5 | 1490 | int w_start_resync(struct drbd_work *w, int cancel) |
1f04af33 | 1491 | { |
00d56944 PR |
1492 | struct drbd_conf *mdev = w->mdev; |
1493 | ||
1f04af33 PR |
1494 | if (atomic_read(&mdev->unacked_cnt) || atomic_read(&mdev->rs_pending_cnt)) { |
1495 | dev_warn(DEV, "w_start_resync later...\n"); | |
1496 | mdev->start_resync_timer.expires = jiffies + HZ/10; | |
1497 | add_timer(&mdev->start_resync_timer); | |
99920dc5 | 1498 | return 0; |
1f04af33 PR |
1499 | } |
1500 | ||
1501 | drbd_start_resync(mdev, C_SYNC_SOURCE); | |
36baf611 | 1502 | clear_bit(AHEAD_TO_SYNC_SOURCE, &mdev->flags); |
99920dc5 | 1503 | return 0; |
1f04af33 PR |
1504 | } |
1505 | ||
b411b363 PR |
1506 | /** |
1507 | * drbd_start_resync() - Start the resync process | |
1508 | * @mdev: DRBD device. | |
1509 | * @side: Either C_SYNC_SOURCE or C_SYNC_TARGET | |
1510 | * | |
1511 | * This function might bring you directly into one of the | |
1512 | * C_PAUSED_SYNC_* states. | |
1513 | */ | |
1514 | void drbd_start_resync(struct drbd_conf *mdev, enum drbd_conns side) | |
1515 | { | |
1516 | union drbd_state ns; | |
1517 | int r; | |
1518 | ||
c4752ef1 | 1519 | if (mdev->state.conn >= C_SYNC_SOURCE && mdev->state.conn < C_AHEAD) { |
b411b363 PR |
1520 | dev_err(DEV, "Resync already running!\n"); |
1521 | return; | |
1522 | } | |
1523 | ||
59817f4f PR |
1524 | if (mdev->state.conn < C_AHEAD) { |
1525 | /* In case a previous resync run was aborted by an IO error/detach on the peer. */ | |
1526 | drbd_rs_cancel_all(mdev); | |
1527 | /* This should be done when we abort the resync. We definitely do not | |
1528 | want to have this for connections going back and forth between | |
1529 | Ahead/Behind and SyncSource/SyncTarget */ | |
1530 | } | |
b411b363 | 1531 | |
e64a3294 PR |
1532 | if (!test_bit(B_RS_H_DONE, &mdev->flags)) { |
1533 | if (side == C_SYNC_TARGET) { | |
1534 | /* Since application IO was locked out during C_WF_BITMAP_T and | |
1535 | C_WF_SYNC_UUID we are still unmodified. Before going to C_SYNC_TARGET | |
1536 | we check that we might make the data inconsistent. */ | |
1537 | r = drbd_khelper(mdev, "before-resync-target"); | |
1538 | r = (r >> 8) & 0xff; | |
1539 | if (r > 0) { | |
1540 | dev_info(DEV, "before-resync-target handler returned %d, " | |
09b9e797 | 1541 | "dropping connection.\n", r); |
38fa9988 | 1542 | conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
09b9e797 PR |
1543 | return; |
1544 | } | |
e64a3294 PR |
1545 | } else /* C_SYNC_SOURCE */ { |
1546 | r = drbd_khelper(mdev, "before-resync-source"); | |
1547 | r = (r >> 8) & 0xff; | |
1548 | if (r > 0) { | |
1549 | if (r == 3) { | |
1550 | dev_info(DEV, "before-resync-source handler returned %d, " | |
1551 | "ignoring. Old userland tools?", r); | |
1552 | } else { | |
1553 | dev_info(DEV, "before-resync-source handler returned %d, " | |
1554 | "dropping connection.\n", r); | |
38fa9988 | 1555 | conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
e64a3294 PR |
1556 | return; |
1557 | } | |
1558 | } | |
09b9e797 | 1559 | } |
b411b363 PR |
1560 | } |
1561 | ||
e64a3294 | 1562 | if (current == mdev->tconn->worker.task) { |
dad20554 | 1563 | /* The worker should not sleep waiting for state_mutex, |
e64a3294 | 1564 | that can take long */ |
8410da8f | 1565 | if (!mutex_trylock(mdev->state_mutex)) { |
e64a3294 PR |
1566 | set_bit(B_RS_H_DONE, &mdev->flags); |
1567 | mdev->start_resync_timer.expires = jiffies + HZ/5; | |
1568 | add_timer(&mdev->start_resync_timer); | |
1569 | return; | |
1570 | } | |
1571 | } else { | |
8410da8f | 1572 | mutex_lock(mdev->state_mutex); |
e64a3294 PR |
1573 | } |
1574 | clear_bit(B_RS_H_DONE, &mdev->flags); | |
b411b363 | 1575 | |
0cfac5dd | 1576 | write_lock_irq(&global_state_lock); |
b411b363 | 1577 | if (!get_ldev_if_state(mdev, D_NEGOTIATING)) { |
0cfac5dd | 1578 | write_unlock_irq(&global_state_lock); |
8410da8f | 1579 | mutex_unlock(mdev->state_mutex); |
b411b363 PR |
1580 | return; |
1581 | } | |
1582 | ||
78bae59b | 1583 | ns = drbd_read_state(mdev); |
b411b363 PR |
1584 | |
1585 | ns.aftr_isp = !_drbd_may_sync_now(mdev); | |
1586 | ||
1587 | ns.conn = side; | |
1588 | ||
1589 | if (side == C_SYNC_TARGET) | |
1590 | ns.disk = D_INCONSISTENT; | |
1591 | else /* side == C_SYNC_SOURCE */ | |
1592 | ns.pdsk = D_INCONSISTENT; | |
1593 | ||
1594 | r = __drbd_set_state(mdev, ns, CS_VERBOSE, NULL); | |
78bae59b | 1595 | ns = drbd_read_state(mdev); |
b411b363 PR |
1596 | |
1597 | if (ns.conn < C_CONNECTED) | |
1598 | r = SS_UNKNOWN_ERROR; | |
1599 | ||
1600 | if (r == SS_SUCCESS) { | |
1d7734a0 LE |
1601 | unsigned long tw = drbd_bm_total_weight(mdev); |
1602 | unsigned long now = jiffies; | |
1603 | int i; | |
1604 | ||
b411b363 PR |
1605 | mdev->rs_failed = 0; |
1606 | mdev->rs_paused = 0; | |
b411b363 | 1607 | mdev->rs_same_csum = 0; |
0f0601f4 LE |
1608 | mdev->rs_last_events = 0; |
1609 | mdev->rs_last_sect_ev = 0; | |
1d7734a0 LE |
1610 | mdev->rs_total = tw; |
1611 | mdev->rs_start = now; | |
1612 | for (i = 0; i < DRBD_SYNC_MARKS; i++) { | |
1613 | mdev->rs_mark_left[i] = tw; | |
1614 | mdev->rs_mark_time[i] = now; | |
1615 | } | |
b411b363 PR |
1616 | _drbd_pause_after(mdev); |
1617 | } | |
1618 | write_unlock_irq(&global_state_lock); | |
5a22db89 | 1619 | |
b411b363 PR |
1620 | if (r == SS_SUCCESS) { |
1621 | dev_info(DEV, "Began resync as %s (will sync %lu KB [%lu bits set]).\n", | |
1622 | drbd_conn_str(ns.conn), | |
1623 | (unsigned long) mdev->rs_total << (BM_BLOCK_SHIFT-10), | |
1624 | (unsigned long) mdev->rs_total); | |
6c922ed5 LE |
1625 | if (side == C_SYNC_TARGET) |
1626 | mdev->bm_resync_fo = 0; | |
1627 | ||
1628 | /* Since protocol 96, we must serialize drbd_gen_and_send_sync_uuid | |
1629 | * with w_send_oos, or the sync target will get confused as to | |
1630 | * how much bits to resync. We cannot do that always, because for an | |
1631 | * empty resync and protocol < 95, we need to do it here, as we call | |
1632 | * drbd_resync_finished from here in that case. | |
1633 | * We drbd_gen_and_send_sync_uuid here for protocol < 96, | |
1634 | * and from after_state_ch otherwise. */ | |
31890f4a | 1635 | if (side == C_SYNC_SOURCE && mdev->tconn->agreed_pro_version < 96) |
6c922ed5 | 1636 | drbd_gen_and_send_sync_uuid(mdev); |
b411b363 | 1637 | |
31890f4a | 1638 | if (mdev->tconn->agreed_pro_version < 95 && mdev->rs_total == 0) { |
af85e8e8 LE |
1639 | /* This still has a race (about when exactly the peers |
1640 | * detect connection loss) that can lead to a full sync | |
1641 | * on next handshake. In 8.3.9 we fixed this with explicit | |
1642 | * resync-finished notifications, but the fix | |
1643 | * introduces a protocol change. Sleeping for some | |
1644 | * time longer than the ping interval + timeout on the | |
1645 | * SyncSource, to give the SyncTarget the chance to | |
1646 | * detect connection loss, then waiting for a ping | |
1647 | * response (implicit in drbd_resync_finished) reduces | |
1648 | * the race considerably, but does not solve it. */ | |
44ed167d PR |
1649 | if (side == C_SYNC_SOURCE) { |
1650 | struct net_conf *nc; | |
1651 | int timeo; | |
1652 | ||
1653 | rcu_read_lock(); | |
1654 | nc = rcu_dereference(mdev->tconn->net_conf); | |
1655 | timeo = nc->ping_int * HZ + nc->ping_timeo * HZ / 9; | |
1656 | rcu_read_unlock(); | |
1657 | schedule_timeout_interruptible(timeo); | |
1658 | } | |
b411b363 | 1659 | drbd_resync_finished(mdev); |
b411b363 PR |
1660 | } |
1661 | ||
9bd28d3c | 1662 | drbd_rs_controller_reset(mdev); |
b411b363 PR |
1663 | /* ns.conn may already be != mdev->state.conn, |
1664 | * we may have been paused in between, or become paused until | |
1665 | * the timer triggers. | |
1666 | * No matter, that is handled in resync_timer_fn() */ | |
1667 | if (ns.conn == C_SYNC_TARGET) | |
1668 | mod_timer(&mdev->resync_timer, jiffies); | |
1669 | ||
1670 | drbd_md_sync(mdev); | |
1671 | } | |
5a22db89 | 1672 | put_ldev(mdev); |
8410da8f | 1673 | mutex_unlock(mdev->state_mutex); |
b411b363 PR |
1674 | } |
1675 | ||
8c0785a5 LE |
1676 | bool dequeue_work_batch(struct drbd_work_queue *queue, struct list_head *work_list) |
1677 | { | |
1678 | spin_lock_irq(&queue->q_lock); | |
1679 | list_splice_init(&queue->q, work_list); | |
1680 | spin_unlock_irq(&queue->q_lock); | |
1681 | return !list_empty(work_list); | |
1682 | } | |
1683 | ||
1684 | bool dequeue_work_item(struct drbd_work_queue *queue, struct list_head *work_list) | |
1685 | { | |
1686 | spin_lock_irq(&queue->q_lock); | |
1687 | if (!list_empty(&queue->q)) | |
1688 | list_move(queue->q.next, work_list); | |
1689 | spin_unlock_irq(&queue->q_lock); | |
1690 | return !list_empty(work_list); | |
1691 | } | |
1692 | ||
b411b363 PR |
1693 | int drbd_worker(struct drbd_thread *thi) |
1694 | { | |
392c8801 | 1695 | struct drbd_tconn *tconn = thi->tconn; |
b411b363 | 1696 | struct drbd_work *w = NULL; |
0e29d163 | 1697 | struct drbd_conf *mdev; |
44ed167d | 1698 | struct net_conf *nc; |
b411b363 | 1699 | LIST_HEAD(work_list); |
8c0785a5 | 1700 | int vnr; |
44ed167d | 1701 | int cork; |
b411b363 | 1702 | |
e77a0a5c | 1703 | while (get_t_state(thi) == RUNNING) { |
80822284 | 1704 | drbd_thread_current_set_cpu(thi); |
b411b363 | 1705 | |
8c0785a5 LE |
1706 | /* as long as we use drbd_queue_work_front(), |
1707 | * we may only dequeue single work items here, not batches. */ | |
1708 | if (list_empty(&work_list)) | |
d5b27b01 | 1709 | dequeue_work_item(&tconn->sender_work, &work_list); |
44ed167d | 1710 | |
8c0785a5 LE |
1711 | /* Still nothing to do? Poke TCP, just in case, |
1712 | * then wait for new work (or signal). */ | |
1713 | if (list_empty(&work_list)) { | |
1714 | mutex_lock(&tconn->data.mutex); | |
44ed167d PR |
1715 | rcu_read_lock(); |
1716 | nc = rcu_dereference(tconn->net_conf); | |
bb77d34e | 1717 | cork = nc ? nc->tcp_cork : 0; |
44ed167d PR |
1718 | rcu_read_unlock(); |
1719 | ||
1720 | if (tconn->data.socket && cork) | |
19393e10 PR |
1721 | drbd_tcp_uncork(tconn->data.socket); |
1722 | mutex_unlock(&tconn->data.mutex); | |
b411b363 | 1723 | |
d5b27b01 LE |
1724 | wait_event_interruptible(tconn->sender_work.q_wait, |
1725 | dequeue_work_item(&tconn->sender_work, &work_list)); | |
b411b363 | 1726 | |
19393e10 | 1727 | mutex_lock(&tconn->data.mutex); |
8c0785a5 | 1728 | if (tconn->data.socket && cork) |
19393e10 PR |
1729 | drbd_tcp_cork(tconn->data.socket); |
1730 | mutex_unlock(&tconn->data.mutex); | |
b411b363 PR |
1731 | } |
1732 | ||
8c0785a5 | 1733 | if (signal_pending(current)) { |
b411b363 | 1734 | flush_signals(current); |
19393e10 PR |
1735 | if (get_t_state(thi) == RUNNING) { |
1736 | conn_warn(tconn, "Worker got an unexpected signal\n"); | |
b411b363 | 1737 | continue; |
19393e10 | 1738 | } |
b411b363 PR |
1739 | break; |
1740 | } | |
1741 | ||
e77a0a5c | 1742 | if (get_t_state(thi) != RUNNING) |
b411b363 | 1743 | break; |
b411b363 | 1744 | |
8c0785a5 LE |
1745 | while (!list_empty(&work_list)) { |
1746 | w = list_first_entry(&work_list, struct drbd_work, list); | |
1747 | list_del_init(&w->list); | |
1748 | if (w->cb(w, tconn->cstate < C_WF_REPORT_PARAMS) == 0) | |
1749 | continue; | |
bbeb641c PR |
1750 | if (tconn->cstate >= C_WF_REPORT_PARAMS) |
1751 | conn_request_state(tconn, NS(conn, C_NETWORK_FAILURE), CS_HARD); | |
b411b363 PR |
1752 | } |
1753 | } | |
b411b363 | 1754 | |
8c0785a5 | 1755 | do { |
b411b363 | 1756 | while (!list_empty(&work_list)) { |
8c0785a5 | 1757 | w = list_first_entry(&work_list, struct drbd_work, list); |
b411b363 | 1758 | list_del_init(&w->list); |
00d56944 | 1759 | w->cb(w, 1); |
b411b363 | 1760 | } |
d5b27b01 | 1761 | dequeue_work_batch(&tconn->sender_work, &work_list); |
8c0785a5 | 1762 | } while (!list_empty(&work_list)); |
b411b363 | 1763 | |
c141ebda | 1764 | rcu_read_lock(); |
f399002e | 1765 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { |
0e29d163 | 1766 | D_ASSERT(mdev->state.disk == D_DISKLESS && mdev->state.conn == C_STANDALONE); |
c141ebda PR |
1767 | kref_get(&mdev->kref); |
1768 | rcu_read_unlock(); | |
0e29d163 | 1769 | drbd_mdev_cleanup(mdev); |
c141ebda PR |
1770 | kref_put(&mdev->kref, &drbd_minor_destroy); |
1771 | rcu_read_lock(); | |
0e29d163 | 1772 | } |
c141ebda | 1773 | rcu_read_unlock(); |
b411b363 PR |
1774 | |
1775 | return 0; | |
1776 | } |