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Commit | Line | Data |
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b411b363 PR |
1 | /* |
2 | drbd_worker.c | |
3 | ||
4 | This file is part of DRBD by Philipp Reisner and Lars Ellenberg. | |
5 | ||
6 | Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. | |
7 | Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>. | |
8 | Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. | |
9 | ||
10 | drbd is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 2, or (at your option) | |
13 | any later version. | |
14 | ||
15 | drbd is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
21 | along with drbd; see the file COPYING. If not, write to | |
22 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
23 | ||
24 | */ | |
25 | ||
b411b363 | 26 | #include <linux/module.h> |
b411b363 PR |
27 | #include <linux/drbd.h> |
28 | #include <linux/sched.h> | |
b411b363 PR |
29 | #include <linux/wait.h> |
30 | #include <linux/mm.h> | |
31 | #include <linux/memcontrol.h> | |
32 | #include <linux/mm_inline.h> | |
33 | #include <linux/slab.h> | |
34 | #include <linux/random.h> | |
b411b363 PR |
35 | #include <linux/string.h> |
36 | #include <linux/scatterlist.h> | |
37 | ||
38 | #include "drbd_int.h" | |
39 | #include "drbd_req.h" | |
b411b363 | 40 | |
00d56944 | 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); | |
c04ccaa6 LE |
92 | if (mdev->ldev) /* special case: drbd_md_read() during drbd_adm_attach() */ |
93 | put_ldev(mdev); | |
b411b363 PR |
94 | } |
95 | ||
96 | /* reads on behalf of the partner, | |
97 | * "submitted" by the receiver | |
98 | */ | |
db830c46 | 99 | void drbd_endio_read_sec_final(struct drbd_peer_request *peer_req) __releases(local) |
b411b363 PR |
100 | { |
101 | unsigned long flags = 0; | |
a21e9298 | 102 | struct drbd_conf *mdev = peer_req->w.mdev; |
b411b363 | 103 | |
87eeee41 | 104 | spin_lock_irqsave(&mdev->tconn->req_lock, flags); |
db830c46 AG |
105 | mdev->read_cnt += peer_req->i.size >> 9; |
106 | list_del(&peer_req->w.list); | |
b411b363 PR |
107 | if (list_empty(&mdev->read_ee)) |
108 | wake_up(&mdev->ee_wait); | |
db830c46 | 109 | if (test_bit(__EE_WAS_ERROR, &peer_req->flags)) |
edc9f5eb | 110 | __drbd_chk_io_error(mdev, DRBD_READ_ERROR); |
87eeee41 | 111 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); |
b411b363 | 112 | |
d5b27b01 | 113 | drbd_queue_work(&mdev->tconn->sender_work, &peer_req->w); |
b411b363 | 114 | put_ldev(mdev); |
b411b363 PR |
115 | } |
116 | ||
117 | /* writes on behalf of the partner, or resync writes, | |
45bb912b | 118 | * "submitted" by the receiver, final stage. */ |
db830c46 | 119 | static void drbd_endio_write_sec_final(struct drbd_peer_request *peer_req) __releases(local) |
b411b363 PR |
120 | { |
121 | unsigned long flags = 0; | |
a21e9298 | 122 | struct drbd_conf *mdev = peer_req->w.mdev; |
181286ad | 123 | struct drbd_interval i; |
b411b363 | 124 | int do_wake; |
579b57ed | 125 | u64 block_id; |
b411b363 | 126 | int do_al_complete_io; |
b411b363 | 127 | |
db830c46 | 128 | /* after we moved peer_req to done_ee, |
b411b363 PR |
129 | * we may no longer access it, |
130 | * it may be freed/reused already! | |
131 | * (as soon as we release the req_lock) */ | |
181286ad | 132 | i = peer_req->i; |
db830c46 AG |
133 | do_al_complete_io = peer_req->flags & EE_CALL_AL_COMPLETE_IO; |
134 | block_id = peer_req->block_id; | |
b411b363 | 135 | |
87eeee41 | 136 | spin_lock_irqsave(&mdev->tconn->req_lock, flags); |
db830c46 | 137 | mdev->writ_cnt += peer_req->i.size >> 9; |
a506c13a | 138 | list_move_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)) |
edc9f5eb | 151 | __drbd_chk_io_error(mdev, DRBD_WRITE_ERROR); |
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 | ||
1b6dd252 PR |
224 | |
225 | /* If this request was aborted locally before, | |
226 | * but now was completed "successfully", | |
227 | * chances are that this caused arbitrary data corruption. | |
228 | * | |
229 | * "aborting" requests, or force-detaching the disk, is intended for | |
230 | * completely blocked/hung local backing devices which do no longer | |
231 | * complete requests at all, not even do error completions. In this | |
232 | * situation, usually a hard-reset and failover is the only way out. | |
233 | * | |
234 | * By "aborting", basically faking a local error-completion, | |
235 | * we allow for a more graceful swichover by cleanly migrating services. | |
236 | * Still the affected node has to be rebooted "soon". | |
237 | * | |
238 | * By completing these requests, we allow the upper layers to re-use | |
239 | * the associated data pages. | |
240 | * | |
241 | * If later the local backing device "recovers", and now DMAs some data | |
242 | * from disk into the original request pages, in the best case it will | |
243 | * just put random data into unused pages; but typically it will corrupt | |
244 | * meanwhile completely unrelated data, causing all sorts of damage. | |
245 | * | |
246 | * Which means delayed successful completion, | |
247 | * especially for READ requests, | |
248 | * is a reason to panic(). | |
249 | * | |
250 | * We assume that a delayed *error* completion is OK, | |
251 | * though we still will complain noisily about it. | |
252 | */ | |
253 | if (unlikely(req->rq_state & RQ_LOCAL_ABORTED)) { | |
254 | if (__ratelimit(&drbd_ratelimit_state)) | |
255 | dev_emerg(DEV, "delayed completion of aborted local request; disk-timeout may be too aggressive\n"); | |
256 | ||
257 | if (!error) | |
258 | panic("possible random memory corruption caused by delayed completion of aborted local request\n"); | |
259 | } | |
260 | ||
b411b363 PR |
261 | /* to avoid recursion in __req_mod */ |
262 | if (unlikely(error)) { | |
263 | what = (bio_data_dir(bio) == WRITE) | |
8554df1c | 264 | ? WRITE_COMPLETED_WITH_ERROR |
5c3c7e64 | 265 | : (bio_rw(bio) == READ) |
8554df1c AG |
266 | ? READ_COMPLETED_WITH_ERROR |
267 | : READ_AHEAD_COMPLETED_WITH_ERROR; | |
b411b363 | 268 | } else |
8554df1c | 269 | what = COMPLETED_OK; |
b411b363 PR |
270 | |
271 | bio_put(req->private_bio); | |
272 | req->private_bio = ERR_PTR(error); | |
273 | ||
a115413d | 274 | /* not req_mod(), we need irqsave here! */ |
87eeee41 | 275 | spin_lock_irqsave(&mdev->tconn->req_lock, flags); |
a115413d | 276 | __req_mod(req, what, &m); |
87eeee41 | 277 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); |
2415308e | 278 | put_ldev(mdev); |
a115413d LE |
279 | |
280 | if (m.bio) | |
281 | complete_master_bio(mdev, &m); | |
b411b363 PR |
282 | } |
283 | ||
f6ffca9f | 284 | void drbd_csum_ee(struct drbd_conf *mdev, struct crypto_hash *tfm, |
db830c46 | 285 | struct drbd_peer_request *peer_req, void *digest) |
45bb912b LE |
286 | { |
287 | struct hash_desc desc; | |
288 | struct scatterlist sg; | |
db830c46 | 289 | struct page *page = peer_req->pages; |
45bb912b LE |
290 | struct page *tmp; |
291 | unsigned len; | |
292 | ||
293 | desc.tfm = tfm; | |
294 | desc.flags = 0; | |
295 | ||
296 | sg_init_table(&sg, 1); | |
297 | crypto_hash_init(&desc); | |
298 | ||
299 | while ((tmp = page_chain_next(page))) { | |
300 | /* all but the last page will be fully used */ | |
301 | sg_set_page(&sg, page, PAGE_SIZE, 0); | |
302 | crypto_hash_update(&desc, &sg, sg.length); | |
303 | page = tmp; | |
304 | } | |
305 | /* and now the last, possibly only partially used page */ | |
db830c46 | 306 | len = peer_req->i.size & (PAGE_SIZE - 1); |
45bb912b LE |
307 | sg_set_page(&sg, page, len ?: PAGE_SIZE, 0); |
308 | crypto_hash_update(&desc, &sg, sg.length); | |
309 | crypto_hash_final(&desc, digest); | |
310 | } | |
311 | ||
312 | void drbd_csum_bio(struct drbd_conf *mdev, struct crypto_hash *tfm, struct bio *bio, void *digest) | |
b411b363 PR |
313 | { |
314 | struct hash_desc desc; | |
315 | struct scatterlist sg; | |
7988613b KO |
316 | struct bio_vec bvec; |
317 | struct bvec_iter iter; | |
b411b363 PR |
318 | |
319 | desc.tfm = tfm; | |
320 | desc.flags = 0; | |
321 | ||
322 | sg_init_table(&sg, 1); | |
323 | crypto_hash_init(&desc); | |
324 | ||
7988613b KO |
325 | bio_for_each_segment(bvec, bio, iter) { |
326 | sg_set_page(&sg, bvec.bv_page, bvec.bv_len, bvec.bv_offset); | |
b411b363 PR |
327 | crypto_hash_update(&desc, &sg, sg.length); |
328 | } | |
329 | crypto_hash_final(&desc, digest); | |
330 | } | |
331 | ||
9676c760 | 332 | /* MAYBE merge common code with w_e_end_ov_req */ |
99920dc5 | 333 | static int w_e_send_csum(struct drbd_work *w, int cancel) |
b411b363 | 334 | { |
00d56944 PR |
335 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
336 | struct drbd_conf *mdev = w->mdev; | |
b411b363 PR |
337 | int digest_size; |
338 | void *digest; | |
99920dc5 | 339 | int err = 0; |
b411b363 | 340 | |
53ea4331 LE |
341 | if (unlikely(cancel)) |
342 | goto out; | |
b411b363 | 343 | |
9676c760 | 344 | if (unlikely((peer_req->flags & EE_WAS_ERROR) != 0)) |
53ea4331 | 345 | goto out; |
b411b363 | 346 | |
f399002e | 347 | digest_size = crypto_hash_digestsize(mdev->tconn->csums_tfm); |
53ea4331 LE |
348 | digest = kmalloc(digest_size, GFP_NOIO); |
349 | if (digest) { | |
db830c46 AG |
350 | sector_t sector = peer_req->i.sector; |
351 | unsigned int size = peer_req->i.size; | |
f399002e | 352 | drbd_csum_ee(mdev, mdev->tconn->csums_tfm, peer_req, digest); |
9676c760 | 353 | /* Free peer_req and pages before send. |
53ea4331 LE |
354 | * In case we block on congestion, we could otherwise run into |
355 | * some distributed deadlock, if the other side blocks on | |
356 | * congestion as well, because our receiver blocks in | |
c37c8ecf | 357 | * drbd_alloc_pages due to pp_in_use > max_buffers. */ |
3967deb1 | 358 | drbd_free_peer_req(mdev, peer_req); |
db830c46 | 359 | peer_req = NULL; |
53ea4331 | 360 | inc_rs_pending(mdev); |
99920dc5 | 361 | err = drbd_send_drequest_csum(mdev, sector, size, |
db1b0b72 AG |
362 | digest, digest_size, |
363 | P_CSUM_RS_REQUEST); | |
53ea4331 LE |
364 | kfree(digest); |
365 | } else { | |
366 | dev_err(DEV, "kmalloc() of digest failed.\n"); | |
99920dc5 | 367 | err = -ENOMEM; |
53ea4331 | 368 | } |
b411b363 | 369 | |
53ea4331 | 370 | out: |
db830c46 | 371 | if (peer_req) |
3967deb1 | 372 | drbd_free_peer_req(mdev, peer_req); |
b411b363 | 373 | |
99920dc5 | 374 | if (unlikely(err)) |
b411b363 | 375 | dev_err(DEV, "drbd_send_drequest(..., csum) failed\n"); |
99920dc5 | 376 | return err; |
b411b363 PR |
377 | } |
378 | ||
379 | #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN) | |
380 | ||
381 | static int read_for_csum(struct drbd_conf *mdev, sector_t sector, int size) | |
382 | { | |
db830c46 | 383 | struct drbd_peer_request *peer_req; |
b411b363 PR |
384 | |
385 | if (!get_ldev(mdev)) | |
80a40e43 | 386 | return -EIO; |
b411b363 | 387 | |
e3555d85 | 388 | if (drbd_rs_should_slow_down(mdev, sector)) |
0f0601f4 LE |
389 | goto defer; |
390 | ||
b411b363 PR |
391 | /* GFP_TRY, because if there is no memory available right now, this may |
392 | * be rescheduled for later. It is "only" background resync, after all. */ | |
0db55363 AG |
393 | peer_req = drbd_alloc_peer_req(mdev, ID_SYNCER /* unused */, sector, |
394 | size, GFP_TRY); | |
db830c46 | 395 | if (!peer_req) |
80a40e43 | 396 | goto defer; |
b411b363 | 397 | |
db830c46 | 398 | peer_req->w.cb = w_e_send_csum; |
87eeee41 | 399 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 | 400 | list_add(&peer_req->w.list, &mdev->read_ee); |
87eeee41 | 401 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 | 402 | |
0f0601f4 | 403 | atomic_add(size >> 9, &mdev->rs_sect_ev); |
fbe29dec | 404 | if (drbd_submit_peer_request(mdev, peer_req, READ, DRBD_FAULT_RS_RD) == 0) |
80a40e43 | 405 | return 0; |
b411b363 | 406 | |
10f6d992 LE |
407 | /* If it failed because of ENOMEM, retry should help. If it failed |
408 | * because bio_add_page failed (probably broken lower level driver), | |
409 | * retry may or may not help. | |
410 | * If it does not, you may need to force disconnect. */ | |
87eeee41 | 411 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 | 412 | list_del(&peer_req->w.list); |
87eeee41 | 413 | spin_unlock_irq(&mdev->tconn->req_lock); |
22cc37a9 | 414 | |
3967deb1 | 415 | drbd_free_peer_req(mdev, peer_req); |
80a40e43 | 416 | defer: |
45bb912b | 417 | put_ldev(mdev); |
80a40e43 | 418 | return -EAGAIN; |
b411b363 PR |
419 | } |
420 | ||
99920dc5 | 421 | int w_resync_timer(struct drbd_work *w, int cancel) |
b411b363 | 422 | { |
00d56944 | 423 | struct drbd_conf *mdev = w->mdev; |
63106d3c PR |
424 | switch (mdev->state.conn) { |
425 | case C_VERIFY_S: | |
00d56944 | 426 | w_make_ov_request(w, cancel); |
63106d3c PR |
427 | break; |
428 | case C_SYNC_TARGET: | |
00d56944 | 429 | w_make_resync_request(w, cancel); |
63106d3c | 430 | break; |
b411b363 PR |
431 | } |
432 | ||
99920dc5 | 433 | return 0; |
794abb75 PR |
434 | } |
435 | ||
436 | void resync_timer_fn(unsigned long data) | |
437 | { | |
438 | struct drbd_conf *mdev = (struct drbd_conf *) data; | |
439 | ||
440 | if (list_empty(&mdev->resync_work.list)) | |
d5b27b01 | 441 | drbd_queue_work(&mdev->tconn->sender_work, &mdev->resync_work); |
b411b363 PR |
442 | } |
443 | ||
778f271d PR |
444 | static void fifo_set(struct fifo_buffer *fb, int value) |
445 | { | |
446 | int i; | |
447 | ||
448 | for (i = 0; i < fb->size; i++) | |
f10f2623 | 449 | fb->values[i] = value; |
778f271d PR |
450 | } |
451 | ||
452 | static int fifo_push(struct fifo_buffer *fb, int value) | |
453 | { | |
454 | int ov; | |
455 | ||
456 | ov = fb->values[fb->head_index]; | |
457 | fb->values[fb->head_index++] = value; | |
458 | ||
459 | if (fb->head_index >= fb->size) | |
460 | fb->head_index = 0; | |
461 | ||
462 | return ov; | |
463 | } | |
464 | ||
465 | static void fifo_add_val(struct fifo_buffer *fb, int value) | |
466 | { | |
467 | int i; | |
468 | ||
469 | for (i = 0; i < fb->size; i++) | |
470 | fb->values[i] += value; | |
471 | } | |
472 | ||
9958c857 PR |
473 | struct fifo_buffer *fifo_alloc(int fifo_size) |
474 | { | |
475 | struct fifo_buffer *fb; | |
476 | ||
8747d30a | 477 | fb = kzalloc(sizeof(struct fifo_buffer) + sizeof(int) * fifo_size, GFP_NOIO); |
9958c857 PR |
478 | if (!fb) |
479 | return NULL; | |
480 | ||
481 | fb->head_index = 0; | |
482 | fb->size = fifo_size; | |
483 | fb->total = 0; | |
484 | ||
485 | return fb; | |
486 | } | |
487 | ||
9d77a5fe | 488 | static int drbd_rs_controller(struct drbd_conf *mdev) |
778f271d | 489 | { |
daeda1cc | 490 | struct disk_conf *dc; |
778f271d PR |
491 | unsigned int sect_in; /* Number of sectors that came in since the last turn */ |
492 | unsigned int want; /* The number of sectors we want in the proxy */ | |
493 | int req_sect; /* Number of sectors to request in this turn */ | |
494 | int correction; /* Number of sectors more we need in the proxy*/ | |
495 | int cps; /* correction per invocation of drbd_rs_controller() */ | |
496 | int steps; /* Number of time steps to plan ahead */ | |
497 | int curr_corr; | |
498 | int max_sect; | |
813472ce | 499 | struct fifo_buffer *plan; |
778f271d PR |
500 | |
501 | sect_in = atomic_xchg(&mdev->rs_sect_in, 0); /* Number of sectors that came in */ | |
502 | mdev->rs_in_flight -= sect_in; | |
503 | ||
daeda1cc | 504 | dc = rcu_dereference(mdev->ldev->disk_conf); |
813472ce | 505 | plan = rcu_dereference(mdev->rs_plan_s); |
778f271d | 506 | |
813472ce | 507 | steps = plan->size; /* (dc->c_plan_ahead * 10 * SLEEP_TIME) / HZ; */ |
778f271d PR |
508 | |
509 | if (mdev->rs_in_flight + sect_in == 0) { /* At start of resync */ | |
daeda1cc | 510 | want = ((dc->resync_rate * 2 * SLEEP_TIME) / HZ) * steps; |
778f271d | 511 | } else { /* normal path */ |
daeda1cc PR |
512 | want = dc->c_fill_target ? dc->c_fill_target : |
513 | sect_in * dc->c_delay_target * HZ / (SLEEP_TIME * 10); | |
778f271d PR |
514 | } |
515 | ||
813472ce | 516 | correction = want - mdev->rs_in_flight - plan->total; |
778f271d PR |
517 | |
518 | /* Plan ahead */ | |
519 | cps = correction / steps; | |
813472ce PR |
520 | fifo_add_val(plan, cps); |
521 | plan->total += cps * steps; | |
778f271d PR |
522 | |
523 | /* What we do in this step */ | |
813472ce PR |
524 | curr_corr = fifo_push(plan, 0); |
525 | plan->total -= curr_corr; | |
778f271d PR |
526 | |
527 | req_sect = sect_in + curr_corr; | |
528 | if (req_sect < 0) | |
529 | req_sect = 0; | |
530 | ||
daeda1cc | 531 | max_sect = (dc->c_max_rate * 2 * SLEEP_TIME) / HZ; |
778f271d PR |
532 | if (req_sect > max_sect) |
533 | req_sect = max_sect; | |
534 | ||
535 | /* | |
536 | dev_warn(DEV, "si=%u if=%d wa=%u co=%d st=%d cps=%d pl=%d cc=%d rs=%d\n", | |
537 | sect_in, mdev->rs_in_flight, want, correction, | |
538 | steps, cps, mdev->rs_planed, curr_corr, req_sect); | |
539 | */ | |
540 | ||
541 | return req_sect; | |
542 | } | |
543 | ||
9d77a5fe | 544 | static int drbd_rs_number_requests(struct drbd_conf *mdev) |
e65f440d LE |
545 | { |
546 | int number; | |
813472ce PR |
547 | |
548 | rcu_read_lock(); | |
549 | if (rcu_dereference(mdev->rs_plan_s)->size) { | |
e65f440d LE |
550 | number = drbd_rs_controller(mdev) >> (BM_BLOCK_SHIFT - 9); |
551 | mdev->c_sync_rate = number * HZ * (BM_BLOCK_SIZE / 1024) / SLEEP_TIME; | |
552 | } else { | |
daeda1cc | 553 | mdev->c_sync_rate = rcu_dereference(mdev->ldev->disk_conf)->resync_rate; |
e65f440d LE |
554 | number = SLEEP_TIME * mdev->c_sync_rate / ((BM_BLOCK_SIZE / 1024) * HZ); |
555 | } | |
813472ce | 556 | rcu_read_unlock(); |
e65f440d | 557 | |
e65f440d LE |
558 | /* ignore the amount of pending requests, the resync controller should |
559 | * throttle down to incoming reply rate soon enough anyways. */ | |
560 | return number; | |
561 | } | |
562 | ||
99920dc5 | 563 | int w_make_resync_request(struct drbd_work *w, int cancel) |
b411b363 | 564 | { |
00d56944 | 565 | struct drbd_conf *mdev = w->mdev; |
b411b363 PR |
566 | unsigned long bit; |
567 | sector_t sector; | |
568 | const sector_t capacity = drbd_get_capacity(mdev->this_bdev); | |
1816a2b4 | 569 | int max_bio_size; |
e65f440d | 570 | int number, rollback_i, size; |
b411b363 | 571 | int align, queued, sndbuf; |
0f0601f4 | 572 | int i = 0; |
b411b363 PR |
573 | |
574 | if (unlikely(cancel)) | |
99920dc5 | 575 | return 0; |
b411b363 | 576 | |
af85e8e8 LE |
577 | if (mdev->rs_total == 0) { |
578 | /* empty resync? */ | |
579 | drbd_resync_finished(mdev); | |
99920dc5 | 580 | return 0; |
af85e8e8 LE |
581 | } |
582 | ||
b411b363 PR |
583 | if (!get_ldev(mdev)) { |
584 | /* Since we only need to access mdev->rsync a | |
585 | get_ldev_if_state(mdev,D_FAILED) would be sufficient, but | |
586 | to continue resync with a broken disk makes no sense at | |
587 | all */ | |
588 | dev_err(DEV, "Disk broke down during resync!\n"); | |
99920dc5 | 589 | return 0; |
b411b363 PR |
590 | } |
591 | ||
0cfdd247 | 592 | max_bio_size = queue_max_hw_sectors(mdev->rq_queue) << 9; |
e65f440d LE |
593 | number = drbd_rs_number_requests(mdev); |
594 | if (number == 0) | |
0f0601f4 | 595 | goto requeue; |
b411b363 | 596 | |
b411b363 PR |
597 | for (i = 0; i < number; i++) { |
598 | /* Stop generating RS requests, when half of the send buffer is filled */ | |
e42325a5 PR |
599 | mutex_lock(&mdev->tconn->data.mutex); |
600 | if (mdev->tconn->data.socket) { | |
601 | queued = mdev->tconn->data.socket->sk->sk_wmem_queued; | |
602 | sndbuf = mdev->tconn->data.socket->sk->sk_sndbuf; | |
b411b363 PR |
603 | } else { |
604 | queued = 1; | |
605 | sndbuf = 0; | |
606 | } | |
e42325a5 | 607 | mutex_unlock(&mdev->tconn->data.mutex); |
b411b363 PR |
608 | if (queued > sndbuf / 2) |
609 | goto requeue; | |
610 | ||
611 | next_sector: | |
612 | size = BM_BLOCK_SIZE; | |
613 | bit = drbd_bm_find_next(mdev, mdev->bm_resync_fo); | |
614 | ||
4b0715f0 | 615 | if (bit == DRBD_END_OF_BITMAP) { |
b411b363 | 616 | mdev->bm_resync_fo = drbd_bm_bits(mdev); |
b411b363 | 617 | put_ldev(mdev); |
99920dc5 | 618 | return 0; |
b411b363 PR |
619 | } |
620 | ||
621 | sector = BM_BIT_TO_SECT(bit); | |
622 | ||
e3555d85 PR |
623 | if (drbd_rs_should_slow_down(mdev, sector) || |
624 | drbd_try_rs_begin_io(mdev, sector)) { | |
b411b363 PR |
625 | mdev->bm_resync_fo = bit; |
626 | goto requeue; | |
627 | } | |
628 | mdev->bm_resync_fo = bit + 1; | |
629 | ||
630 | if (unlikely(drbd_bm_test_bit(mdev, bit) == 0)) { | |
631 | drbd_rs_complete_io(mdev, sector); | |
632 | goto next_sector; | |
633 | } | |
634 | ||
1816a2b4 | 635 | #if DRBD_MAX_BIO_SIZE > BM_BLOCK_SIZE |
b411b363 PR |
636 | /* try to find some adjacent bits. |
637 | * we stop if we have already the maximum req size. | |
638 | * | |
639 | * Additionally always align bigger requests, in order to | |
640 | * be prepared for all stripe sizes of software RAIDs. | |
b411b363 PR |
641 | */ |
642 | align = 1; | |
d207450c | 643 | rollback_i = i; |
b411b363 | 644 | for (;;) { |
1816a2b4 | 645 | if (size + BM_BLOCK_SIZE > max_bio_size) |
b411b363 PR |
646 | break; |
647 | ||
648 | /* Be always aligned */ | |
649 | if (sector & ((1<<(align+3))-1)) | |
650 | break; | |
651 | ||
652 | /* do not cross extent boundaries */ | |
653 | if (((bit+1) & BM_BLOCKS_PER_BM_EXT_MASK) == 0) | |
654 | break; | |
655 | /* now, is it actually dirty, after all? | |
656 | * caution, drbd_bm_test_bit is tri-state for some | |
657 | * obscure reason; ( b == 0 ) would get the out-of-band | |
658 | * only accidentally right because of the "oddly sized" | |
659 | * adjustment below */ | |
660 | if (drbd_bm_test_bit(mdev, bit+1) != 1) | |
661 | break; | |
662 | bit++; | |
663 | size += BM_BLOCK_SIZE; | |
664 | if ((BM_BLOCK_SIZE << align) <= size) | |
665 | align++; | |
666 | i++; | |
667 | } | |
668 | /* if we merged some, | |
669 | * reset the offset to start the next drbd_bm_find_next from */ | |
670 | if (size > BM_BLOCK_SIZE) | |
671 | mdev->bm_resync_fo = bit + 1; | |
672 | #endif | |
673 | ||
674 | /* adjust very last sectors, in case we are oddly sized */ | |
675 | if (sector + (size>>9) > capacity) | |
676 | size = (capacity-sector)<<9; | |
f399002e | 677 | if (mdev->tconn->agreed_pro_version >= 89 && mdev->tconn->csums_tfm) { |
b411b363 | 678 | switch (read_for_csum(mdev, sector, size)) { |
80a40e43 | 679 | case -EIO: /* Disk failure */ |
b411b363 | 680 | put_ldev(mdev); |
99920dc5 | 681 | return -EIO; |
80a40e43 | 682 | case -EAGAIN: /* allocation failed, or ldev busy */ |
b411b363 PR |
683 | drbd_rs_complete_io(mdev, sector); |
684 | mdev->bm_resync_fo = BM_SECT_TO_BIT(sector); | |
d207450c | 685 | i = rollback_i; |
b411b363 | 686 | goto requeue; |
80a40e43 LE |
687 | case 0: |
688 | /* everything ok */ | |
689 | break; | |
690 | default: | |
691 | BUG(); | |
b411b363 PR |
692 | } |
693 | } else { | |
99920dc5 AG |
694 | int err; |
695 | ||
b411b363 | 696 | inc_rs_pending(mdev); |
99920dc5 AG |
697 | err = drbd_send_drequest(mdev, P_RS_DATA_REQUEST, |
698 | sector, size, ID_SYNCER); | |
699 | if (err) { | |
b411b363 PR |
700 | dev_err(DEV, "drbd_send_drequest() failed, aborting...\n"); |
701 | dec_rs_pending(mdev); | |
702 | put_ldev(mdev); | |
99920dc5 | 703 | return err; |
b411b363 PR |
704 | } |
705 | } | |
706 | } | |
707 | ||
708 | if (mdev->bm_resync_fo >= drbd_bm_bits(mdev)) { | |
709 | /* last syncer _request_ was sent, | |
710 | * but the P_RS_DATA_REPLY not yet received. sync will end (and | |
711 | * next sync group will resume), as soon as we receive the last | |
712 | * resync data block, and the last bit is cleared. | |
713 | * until then resync "work" is "inactive" ... | |
714 | */ | |
b411b363 | 715 | put_ldev(mdev); |
99920dc5 | 716 | return 0; |
b411b363 PR |
717 | } |
718 | ||
719 | requeue: | |
778f271d | 720 | mdev->rs_in_flight += (i << (BM_BLOCK_SHIFT - 9)); |
b411b363 PR |
721 | mod_timer(&mdev->resync_timer, jiffies + SLEEP_TIME); |
722 | put_ldev(mdev); | |
99920dc5 | 723 | return 0; |
b411b363 PR |
724 | } |
725 | ||
00d56944 | 726 | static int w_make_ov_request(struct drbd_work *w, int cancel) |
b411b363 | 727 | { |
00d56944 | 728 | struct drbd_conf *mdev = w->mdev; |
b411b363 PR |
729 | int number, i, size; |
730 | sector_t sector; | |
731 | const sector_t capacity = drbd_get_capacity(mdev->this_bdev); | |
58ffa580 | 732 | bool stop_sector_reached = false; |
b411b363 PR |
733 | |
734 | if (unlikely(cancel)) | |
735 | return 1; | |
736 | ||
2649f080 | 737 | number = drbd_rs_number_requests(mdev); |
b411b363 PR |
738 | |
739 | sector = mdev->ov_position; | |
740 | for (i = 0; i < number; i++) { | |
58ffa580 | 741 | if (sector >= capacity) |
b411b363 | 742 | return 1; |
58ffa580 LE |
743 | |
744 | /* We check for "finished" only in the reply path: | |
745 | * w_e_end_ov_reply(). | |
746 | * We need to send at least one request out. */ | |
747 | stop_sector_reached = i > 0 | |
748 | && verify_can_do_stop_sector(mdev) | |
749 | && sector >= mdev->ov_stop_sector; | |
750 | if (stop_sector_reached) | |
751 | break; | |
b411b363 PR |
752 | |
753 | size = BM_BLOCK_SIZE; | |
754 | ||
e3555d85 PR |
755 | if (drbd_rs_should_slow_down(mdev, sector) || |
756 | drbd_try_rs_begin_io(mdev, sector)) { | |
b411b363 PR |
757 | mdev->ov_position = sector; |
758 | goto requeue; | |
759 | } | |
760 | ||
761 | if (sector + (size>>9) > capacity) | |
762 | size = (capacity-sector)<<9; | |
763 | ||
764 | inc_rs_pending(mdev); | |
5b9f499c | 765 | if (drbd_send_ov_request(mdev, sector, size)) { |
b411b363 PR |
766 | dec_rs_pending(mdev); |
767 | return 0; | |
768 | } | |
769 | sector += BM_SECT_PER_BIT; | |
770 | } | |
771 | mdev->ov_position = sector; | |
772 | ||
773 | requeue: | |
2649f080 | 774 | mdev->rs_in_flight += (i << (BM_BLOCK_SHIFT - 9)); |
58ffa580 LE |
775 | if (i == 0 || !stop_sector_reached) |
776 | mod_timer(&mdev->resync_timer, jiffies + SLEEP_TIME); | |
b411b363 PR |
777 | return 1; |
778 | } | |
779 | ||
99920dc5 | 780 | int w_ov_finished(struct drbd_work *w, int cancel) |
b411b363 | 781 | { |
00d56944 | 782 | struct drbd_conf *mdev = w->mdev; |
b411b363 | 783 | kfree(w); |
8f7bed77 | 784 | ov_out_of_sync_print(mdev); |
b411b363 PR |
785 | drbd_resync_finished(mdev); |
786 | ||
99920dc5 | 787 | return 0; |
b411b363 PR |
788 | } |
789 | ||
99920dc5 | 790 | static int w_resync_finished(struct drbd_work *w, int cancel) |
b411b363 | 791 | { |
00d56944 | 792 | struct drbd_conf *mdev = w->mdev; |
b411b363 PR |
793 | kfree(w); |
794 | ||
795 | drbd_resync_finished(mdev); | |
796 | ||
99920dc5 | 797 | return 0; |
b411b363 PR |
798 | } |
799 | ||
af85e8e8 LE |
800 | static void ping_peer(struct drbd_conf *mdev) |
801 | { | |
2a67d8b9 PR |
802 | struct drbd_tconn *tconn = mdev->tconn; |
803 | ||
804 | clear_bit(GOT_PING_ACK, &tconn->flags); | |
805 | request_ping(tconn); | |
806 | wait_event(tconn->ping_wait, | |
807 | test_bit(GOT_PING_ACK, &tconn->flags) || mdev->state.conn < C_CONNECTED); | |
af85e8e8 LE |
808 | } |
809 | ||
b411b363 PR |
810 | int drbd_resync_finished(struct drbd_conf *mdev) |
811 | { | |
812 | unsigned long db, dt, dbdt; | |
813 | unsigned long n_oos; | |
814 | union drbd_state os, ns; | |
815 | struct drbd_work *w; | |
816 | char *khelper_cmd = NULL; | |
26525618 | 817 | int verify_done = 0; |
b411b363 PR |
818 | |
819 | /* Remove all elements from the resync LRU. Since future actions | |
820 | * might set bits in the (main) bitmap, then the entries in the | |
821 | * resync LRU would be wrong. */ | |
822 | if (drbd_rs_del_all(mdev)) { | |
823 | /* In case this is not possible now, most probably because | |
824 | * there are P_RS_DATA_REPLY Packets lingering on the worker's | |
825 | * queue (or even the read operations for those packets | |
826 | * is not finished by now). Retry in 100ms. */ | |
827 | ||
20ee6390 | 828 | schedule_timeout_interruptible(HZ / 10); |
b411b363 PR |
829 | w = kmalloc(sizeof(struct drbd_work), GFP_ATOMIC); |
830 | if (w) { | |
831 | w->cb = w_resync_finished; | |
9b743da9 | 832 | w->mdev = mdev; |
d5b27b01 | 833 | drbd_queue_work(&mdev->tconn->sender_work, w); |
b411b363 PR |
834 | return 1; |
835 | } | |
836 | dev_err(DEV, "Warn failed to drbd_rs_del_all() and to kmalloc(w).\n"); | |
837 | } | |
838 | ||
839 | dt = (jiffies - mdev->rs_start - mdev->rs_paused) / HZ; | |
840 | if (dt <= 0) | |
841 | dt = 1; | |
58ffa580 | 842 | |
b411b363 | 843 | db = mdev->rs_total; |
58ffa580 LE |
844 | /* adjust for verify start and stop sectors, respective reached position */ |
845 | if (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T) | |
846 | db -= mdev->ov_left; | |
847 | ||
b411b363 PR |
848 | dbdt = Bit2KB(db/dt); |
849 | mdev->rs_paused /= HZ; | |
850 | ||
851 | if (!get_ldev(mdev)) | |
852 | goto out; | |
853 | ||
af85e8e8 LE |
854 | ping_peer(mdev); |
855 | ||
87eeee41 | 856 | spin_lock_irq(&mdev->tconn->req_lock); |
78bae59b | 857 | os = drbd_read_state(mdev); |
b411b363 | 858 | |
26525618 LE |
859 | verify_done = (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T); |
860 | ||
b411b363 PR |
861 | /* This protects us against multiple calls (that can happen in the presence |
862 | of application IO), and against connectivity loss just before we arrive here. */ | |
863 | if (os.conn <= C_CONNECTED) | |
864 | goto out_unlock; | |
865 | ||
866 | ns = os; | |
867 | ns.conn = C_CONNECTED; | |
868 | ||
869 | dev_info(DEV, "%s done (total %lu sec; paused %lu sec; %lu K/sec)\n", | |
58ffa580 | 870 | verify_done ? "Online verify" : "Resync", |
b411b363 PR |
871 | dt + mdev->rs_paused, mdev->rs_paused, dbdt); |
872 | ||
873 | n_oos = drbd_bm_total_weight(mdev); | |
874 | ||
875 | if (os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) { | |
876 | if (n_oos) { | |
877 | dev_alert(DEV, "Online verify found %lu %dk block out of sync!\n", | |
878 | n_oos, Bit2KB(1)); | |
879 | khelper_cmd = "out-of-sync"; | |
880 | } | |
881 | } else { | |
882 | D_ASSERT((n_oos - mdev->rs_failed) == 0); | |
883 | ||
884 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) | |
885 | khelper_cmd = "after-resync-target"; | |
886 | ||
f399002e | 887 | if (mdev->tconn->csums_tfm && mdev->rs_total) { |
b411b363 PR |
888 | const unsigned long s = mdev->rs_same_csum; |
889 | const unsigned long t = mdev->rs_total; | |
890 | const int ratio = | |
891 | (t == 0) ? 0 : | |
892 | (t < 100000) ? ((s*100)/t) : (s/(t/100)); | |
24c4830c | 893 | dev_info(DEV, "%u %% had equal checksums, eliminated: %luK; " |
b411b363 PR |
894 | "transferred %luK total %luK\n", |
895 | ratio, | |
896 | Bit2KB(mdev->rs_same_csum), | |
897 | Bit2KB(mdev->rs_total - mdev->rs_same_csum), | |
898 | Bit2KB(mdev->rs_total)); | |
899 | } | |
900 | } | |
901 | ||
902 | if (mdev->rs_failed) { | |
903 | dev_info(DEV, " %lu failed blocks\n", mdev->rs_failed); | |
904 | ||
905 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) { | |
906 | ns.disk = D_INCONSISTENT; | |
907 | ns.pdsk = D_UP_TO_DATE; | |
908 | } else { | |
909 | ns.disk = D_UP_TO_DATE; | |
910 | ns.pdsk = D_INCONSISTENT; | |
911 | } | |
912 | } else { | |
913 | ns.disk = D_UP_TO_DATE; | |
914 | ns.pdsk = D_UP_TO_DATE; | |
915 | ||
916 | if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T) { | |
917 | if (mdev->p_uuid) { | |
918 | int i; | |
919 | for (i = UI_BITMAP ; i <= UI_HISTORY_END ; i++) | |
920 | _drbd_uuid_set(mdev, i, mdev->p_uuid[i]); | |
921 | drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_CURRENT]); | |
922 | _drbd_uuid_set(mdev, UI_CURRENT, mdev->p_uuid[UI_CURRENT]); | |
923 | } else { | |
924 | dev_err(DEV, "mdev->p_uuid is NULL! BUG\n"); | |
925 | } | |
926 | } | |
927 | ||
62b0da3a LE |
928 | if (!(os.conn == C_VERIFY_S || os.conn == C_VERIFY_T)) { |
929 | /* for verify runs, we don't update uuids here, | |
930 | * so there would be nothing to report. */ | |
931 | drbd_uuid_set_bm(mdev, 0UL); | |
932 | drbd_print_uuids(mdev, "updated UUIDs"); | |
933 | if (mdev->p_uuid) { | |
934 | /* Now the two UUID sets are equal, update what we | |
935 | * know of the peer. */ | |
936 | int i; | |
937 | for (i = UI_CURRENT ; i <= UI_HISTORY_END ; i++) | |
938 | mdev->p_uuid[i] = mdev->ldev->md.uuid[i]; | |
939 | } | |
b411b363 PR |
940 | } |
941 | } | |
942 | ||
943 | _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); | |
944 | out_unlock: | |
87eeee41 | 945 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
946 | put_ldev(mdev); |
947 | out: | |
948 | mdev->rs_total = 0; | |
949 | mdev->rs_failed = 0; | |
950 | mdev->rs_paused = 0; | |
58ffa580 LE |
951 | |
952 | /* reset start sector, if we reached end of device */ | |
953 | if (verify_done && mdev->ov_left == 0) | |
26525618 | 954 | mdev->ov_start_sector = 0; |
b411b363 | 955 | |
13d42685 LE |
956 | drbd_md_sync(mdev); |
957 | ||
b411b363 PR |
958 | if (khelper_cmd) |
959 | drbd_khelper(mdev, khelper_cmd); | |
960 | ||
961 | return 1; | |
962 | } | |
963 | ||
964 | /* helper */ | |
db830c46 | 965 | static void move_to_net_ee_or_free(struct drbd_conf *mdev, struct drbd_peer_request *peer_req) |
b411b363 | 966 | { |
045417f7 | 967 | if (drbd_peer_req_has_active_page(peer_req)) { |
b411b363 | 968 | /* This might happen if sendpage() has not finished */ |
db830c46 | 969 | int i = (peer_req->i.size + PAGE_SIZE -1) >> PAGE_SHIFT; |
435f0740 LE |
970 | atomic_add(i, &mdev->pp_in_use_by_net); |
971 | atomic_sub(i, &mdev->pp_in_use); | |
87eeee41 | 972 | spin_lock_irq(&mdev->tconn->req_lock); |
db830c46 | 973 | list_add_tail(&peer_req->w.list, &mdev->net_ee); |
87eeee41 | 974 | spin_unlock_irq(&mdev->tconn->req_lock); |
435f0740 | 975 | wake_up(&drbd_pp_wait); |
b411b363 | 976 | } else |
3967deb1 | 977 | drbd_free_peer_req(mdev, peer_req); |
b411b363 PR |
978 | } |
979 | ||
980 | /** | |
981 | * w_e_end_data_req() - Worker callback, to send a P_DATA_REPLY packet in response to a P_DATA_REQUEST | |
982 | * @mdev: DRBD device. | |
983 | * @w: work object. | |
984 | * @cancel: The connection will be closed anyways | |
985 | */ | |
99920dc5 | 986 | int w_e_end_data_req(struct drbd_work *w, int cancel) |
b411b363 | 987 | { |
db830c46 | 988 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
00d56944 | 989 | struct drbd_conf *mdev = w->mdev; |
99920dc5 | 990 | int err; |
b411b363 PR |
991 | |
992 | if (unlikely(cancel)) { | |
3967deb1 | 993 | drbd_free_peer_req(mdev, peer_req); |
b411b363 | 994 | dec_unacked(mdev); |
99920dc5 | 995 | return 0; |
b411b363 PR |
996 | } |
997 | ||
db830c46 | 998 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
99920dc5 | 999 | err = drbd_send_block(mdev, P_DATA_REPLY, peer_req); |
b411b363 PR |
1000 | } else { |
1001 | if (__ratelimit(&drbd_ratelimit_state)) | |
1002 | dev_err(DEV, "Sending NegDReply. sector=%llus.\n", | |
db830c46 | 1003 | (unsigned long long)peer_req->i.sector); |
b411b363 | 1004 | |
99920dc5 | 1005 | err = drbd_send_ack(mdev, P_NEG_DREPLY, peer_req); |
b411b363 PR |
1006 | } |
1007 | ||
1008 | dec_unacked(mdev); | |
1009 | ||
db830c46 | 1010 | move_to_net_ee_or_free(mdev, peer_req); |
b411b363 | 1011 | |
99920dc5 | 1012 | if (unlikely(err)) |
b411b363 | 1013 | dev_err(DEV, "drbd_send_block() failed\n"); |
99920dc5 | 1014 | return err; |
b411b363 PR |
1015 | } |
1016 | ||
1017 | /** | |
a209b4ae | 1018 | * 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 |
1019 | * @mdev: DRBD device. |
1020 | * @w: work object. | |
1021 | * @cancel: The connection will be closed anyways | |
1022 | */ | |
99920dc5 | 1023 | int w_e_end_rsdata_req(struct drbd_work *w, int cancel) |
b411b363 | 1024 | { |
db830c46 | 1025 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
00d56944 | 1026 | struct drbd_conf *mdev = w->mdev; |
99920dc5 | 1027 | int err; |
b411b363 PR |
1028 | |
1029 | if (unlikely(cancel)) { | |
3967deb1 | 1030 | drbd_free_peer_req(mdev, peer_req); |
b411b363 | 1031 | dec_unacked(mdev); |
99920dc5 | 1032 | return 0; |
b411b363 PR |
1033 | } |
1034 | ||
1035 | if (get_ldev_if_state(mdev, D_FAILED)) { | |
db830c46 | 1036 | drbd_rs_complete_io(mdev, peer_req->i.sector); |
b411b363 PR |
1037 | put_ldev(mdev); |
1038 | } | |
1039 | ||
d612d309 | 1040 | if (mdev->state.conn == C_AHEAD) { |
99920dc5 | 1041 | err = drbd_send_ack(mdev, P_RS_CANCEL, peer_req); |
db830c46 | 1042 | } else if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
1043 | if (likely(mdev->state.pdsk >= D_INCONSISTENT)) { |
1044 | inc_rs_pending(mdev); | |
99920dc5 | 1045 | err = drbd_send_block(mdev, P_RS_DATA_REPLY, peer_req); |
b411b363 PR |
1046 | } else { |
1047 | if (__ratelimit(&drbd_ratelimit_state)) | |
1048 | dev_err(DEV, "Not sending RSDataReply, " | |
1049 | "partner DISKLESS!\n"); | |
99920dc5 | 1050 | err = 0; |
b411b363 PR |
1051 | } |
1052 | } else { | |
1053 | if (__ratelimit(&drbd_ratelimit_state)) | |
1054 | dev_err(DEV, "Sending NegRSDReply. sector %llus.\n", | |
db830c46 | 1055 | (unsigned long long)peer_req->i.sector); |
b411b363 | 1056 | |
99920dc5 | 1057 | err = drbd_send_ack(mdev, P_NEG_RS_DREPLY, peer_req); |
b411b363 PR |
1058 | |
1059 | /* update resync data with failure */ | |
db830c46 | 1060 | drbd_rs_failed_io(mdev, peer_req->i.sector, peer_req->i.size); |
b411b363 PR |
1061 | } |
1062 | ||
1063 | dec_unacked(mdev); | |
1064 | ||
db830c46 | 1065 | move_to_net_ee_or_free(mdev, peer_req); |
b411b363 | 1066 | |
99920dc5 | 1067 | if (unlikely(err)) |
b411b363 | 1068 | dev_err(DEV, "drbd_send_block() failed\n"); |
99920dc5 | 1069 | return err; |
b411b363 PR |
1070 | } |
1071 | ||
99920dc5 | 1072 | int w_e_end_csum_rs_req(struct drbd_work *w, int cancel) |
b411b363 | 1073 | { |
db830c46 | 1074 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
00d56944 | 1075 | struct drbd_conf *mdev = w->mdev; |
b411b363 PR |
1076 | struct digest_info *di; |
1077 | int digest_size; | |
1078 | void *digest = NULL; | |
99920dc5 | 1079 | int err, eq = 0; |
b411b363 PR |
1080 | |
1081 | if (unlikely(cancel)) { | |
3967deb1 | 1082 | drbd_free_peer_req(mdev, peer_req); |
b411b363 | 1083 | dec_unacked(mdev); |
99920dc5 | 1084 | return 0; |
b411b363 PR |
1085 | } |
1086 | ||
1d53f09e | 1087 | if (get_ldev(mdev)) { |
db830c46 | 1088 | drbd_rs_complete_io(mdev, peer_req->i.sector); |
1d53f09e LE |
1089 | put_ldev(mdev); |
1090 | } | |
b411b363 | 1091 | |
db830c46 | 1092 | di = peer_req->digest; |
b411b363 | 1093 | |
db830c46 | 1094 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
b411b363 PR |
1095 | /* quick hack to try to avoid a race against reconfiguration. |
1096 | * a real fix would be much more involved, | |
1097 | * introducing more locking mechanisms */ | |
f399002e LE |
1098 | if (mdev->tconn->csums_tfm) { |
1099 | digest_size = crypto_hash_digestsize(mdev->tconn->csums_tfm); | |
b411b363 PR |
1100 | D_ASSERT(digest_size == di->digest_size); |
1101 | digest = kmalloc(digest_size, GFP_NOIO); | |
1102 | } | |
1103 | if (digest) { | |
f399002e | 1104 | drbd_csum_ee(mdev, mdev->tconn->csums_tfm, peer_req, digest); |
b411b363 PR |
1105 | eq = !memcmp(digest, di->digest, digest_size); |
1106 | kfree(digest); | |
1107 | } | |
1108 | ||
1109 | if (eq) { | |
db830c46 | 1110 | drbd_set_in_sync(mdev, peer_req->i.sector, peer_req->i.size); |
676396d5 | 1111 | /* rs_same_csums unit is BM_BLOCK_SIZE */ |
db830c46 | 1112 | mdev->rs_same_csum += peer_req->i.size >> BM_BLOCK_SHIFT; |
99920dc5 | 1113 | err = drbd_send_ack(mdev, P_RS_IS_IN_SYNC, peer_req); |
b411b363 PR |
1114 | } else { |
1115 | inc_rs_pending(mdev); | |
db830c46 AG |
1116 | peer_req->block_id = ID_SYNCER; /* By setting block_id, digest pointer becomes invalid! */ |
1117 | peer_req->flags &= ~EE_HAS_DIGEST; /* This peer request no longer has a digest pointer */ | |
204bba99 | 1118 | kfree(di); |
99920dc5 | 1119 | err = drbd_send_block(mdev, P_RS_DATA_REPLY, peer_req); |
b411b363 PR |
1120 | } |
1121 | } else { | |
99920dc5 | 1122 | err = drbd_send_ack(mdev, P_NEG_RS_DREPLY, peer_req); |
b411b363 PR |
1123 | if (__ratelimit(&drbd_ratelimit_state)) |
1124 | dev_err(DEV, "Sending NegDReply. I guess it gets messy.\n"); | |
1125 | } | |
1126 | ||
1127 | dec_unacked(mdev); | |
db830c46 | 1128 | move_to_net_ee_or_free(mdev, peer_req); |
b411b363 | 1129 | |
99920dc5 | 1130 | if (unlikely(err)) |
b411b363 | 1131 | dev_err(DEV, "drbd_send_block/ack() failed\n"); |
99920dc5 | 1132 | return err; |
b411b363 PR |
1133 | } |
1134 | ||
99920dc5 | 1135 | int w_e_end_ov_req(struct drbd_work *w, int cancel) |
b411b363 | 1136 | { |
db830c46 | 1137 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
00d56944 | 1138 | struct drbd_conf *mdev = w->mdev; |
db830c46 AG |
1139 | sector_t sector = peer_req->i.sector; |
1140 | unsigned int size = peer_req->i.size; | |
b411b363 PR |
1141 | int digest_size; |
1142 | void *digest; | |
99920dc5 | 1143 | int err = 0; |
b411b363 PR |
1144 | |
1145 | if (unlikely(cancel)) | |
1146 | goto out; | |
1147 | ||
f399002e | 1148 | digest_size = crypto_hash_digestsize(mdev->tconn->verify_tfm); |
b411b363 | 1149 | digest = kmalloc(digest_size, GFP_NOIO); |
8f21420e | 1150 | if (!digest) { |
99920dc5 | 1151 | err = 1; /* terminate the connection in case the allocation failed */ |
8f21420e | 1152 | goto out; |
b411b363 PR |
1153 | } |
1154 | ||
db830c46 | 1155 | if (likely(!(peer_req->flags & EE_WAS_ERROR))) |
f399002e | 1156 | drbd_csum_ee(mdev, mdev->tconn->verify_tfm, peer_req, digest); |
8f21420e PR |
1157 | else |
1158 | memset(digest, 0, digest_size); | |
1159 | ||
53ea4331 LE |
1160 | /* Free e and pages before send. |
1161 | * In case we block on congestion, we could otherwise run into | |
1162 | * some distributed deadlock, if the other side blocks on | |
1163 | * congestion as well, because our receiver blocks in | |
c37c8ecf | 1164 | * drbd_alloc_pages due to pp_in_use > max_buffers. */ |
3967deb1 | 1165 | drbd_free_peer_req(mdev, peer_req); |
db830c46 | 1166 | peer_req = NULL; |
8f21420e | 1167 | inc_rs_pending(mdev); |
99920dc5 AG |
1168 | err = drbd_send_drequest_csum(mdev, sector, size, digest, digest_size, P_OV_REPLY); |
1169 | if (err) | |
8f21420e PR |
1170 | dec_rs_pending(mdev); |
1171 | kfree(digest); | |
1172 | ||
b411b363 | 1173 | out: |
db830c46 | 1174 | if (peer_req) |
3967deb1 | 1175 | drbd_free_peer_req(mdev, peer_req); |
b411b363 | 1176 | dec_unacked(mdev); |
99920dc5 | 1177 | return err; |
b411b363 PR |
1178 | } |
1179 | ||
8f7bed77 | 1180 | void drbd_ov_out_of_sync_found(struct drbd_conf *mdev, sector_t sector, int size) |
b411b363 PR |
1181 | { |
1182 | if (mdev->ov_last_oos_start + mdev->ov_last_oos_size == sector) { | |
1183 | mdev->ov_last_oos_size += size>>9; | |
1184 | } else { | |
1185 | mdev->ov_last_oos_start = sector; | |
1186 | mdev->ov_last_oos_size = size>>9; | |
1187 | } | |
1188 | drbd_set_out_of_sync(mdev, sector, size); | |
b411b363 PR |
1189 | } |
1190 | ||
99920dc5 | 1191 | int w_e_end_ov_reply(struct drbd_work *w, int cancel) |
b411b363 | 1192 | { |
db830c46 | 1193 | struct drbd_peer_request *peer_req = container_of(w, struct drbd_peer_request, w); |
00d56944 | 1194 | struct drbd_conf *mdev = w->mdev; |
b411b363 | 1195 | struct digest_info *di; |
b411b363 | 1196 | void *digest; |
db830c46 AG |
1197 | sector_t sector = peer_req->i.sector; |
1198 | unsigned int size = peer_req->i.size; | |
53ea4331 | 1199 | int digest_size; |
99920dc5 | 1200 | int err, eq = 0; |
58ffa580 | 1201 | bool stop_sector_reached = false; |
b411b363 PR |
1202 | |
1203 | if (unlikely(cancel)) { | |
3967deb1 | 1204 | drbd_free_peer_req(mdev, peer_req); |
b411b363 | 1205 | dec_unacked(mdev); |
99920dc5 | 1206 | return 0; |
b411b363 PR |
1207 | } |
1208 | ||
1209 | /* after "cancel", because after drbd_disconnect/drbd_rs_cancel_all | |
1210 | * the resync lru has been cleaned up already */ | |
1d53f09e | 1211 | if (get_ldev(mdev)) { |
db830c46 | 1212 | drbd_rs_complete_io(mdev, peer_req->i.sector); |
1d53f09e LE |
1213 | put_ldev(mdev); |
1214 | } | |
b411b363 | 1215 | |
db830c46 | 1216 | di = peer_req->digest; |
b411b363 | 1217 | |
db830c46 | 1218 | if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { |
f399002e | 1219 | digest_size = crypto_hash_digestsize(mdev->tconn->verify_tfm); |
b411b363 PR |
1220 | digest = kmalloc(digest_size, GFP_NOIO); |
1221 | if (digest) { | |
f399002e | 1222 | drbd_csum_ee(mdev, mdev->tconn->verify_tfm, peer_req, digest); |
b411b363 PR |
1223 | |
1224 | D_ASSERT(digest_size == di->digest_size); | |
1225 | eq = !memcmp(digest, di->digest, digest_size); | |
1226 | kfree(digest); | |
1227 | } | |
b411b363 PR |
1228 | } |
1229 | ||
9676c760 LE |
1230 | /* Free peer_req and pages before send. |
1231 | * In case we block on congestion, we could otherwise run into | |
1232 | * some distributed deadlock, if the other side blocks on | |
1233 | * congestion as well, because our receiver blocks in | |
c37c8ecf | 1234 | * drbd_alloc_pages due to pp_in_use > max_buffers. */ |
3967deb1 | 1235 | drbd_free_peer_req(mdev, peer_req); |
b411b363 | 1236 | if (!eq) |
8f7bed77 | 1237 | drbd_ov_out_of_sync_found(mdev, sector, size); |
b411b363 | 1238 | else |
8f7bed77 | 1239 | ov_out_of_sync_print(mdev); |
b411b363 | 1240 | |
99920dc5 | 1241 | err = drbd_send_ack_ex(mdev, P_OV_RESULT, sector, size, |
fa79abd8 | 1242 | eq ? ID_IN_SYNC : ID_OUT_OF_SYNC); |
b411b363 | 1243 | |
53ea4331 | 1244 | dec_unacked(mdev); |
b411b363 | 1245 | |
ea5442af LE |
1246 | --mdev->ov_left; |
1247 | ||
1248 | /* let's advance progress step marks only for every other megabyte */ | |
1249 | if ((mdev->ov_left & 0x200) == 0x200) | |
1250 | drbd_advance_rs_marks(mdev, mdev->ov_left); | |
1251 | ||
58ffa580 LE |
1252 | stop_sector_reached = verify_can_do_stop_sector(mdev) && |
1253 | (sector + (size>>9)) >= mdev->ov_stop_sector; | |
1254 | ||
1255 | if (mdev->ov_left == 0 || stop_sector_reached) { | |
8f7bed77 | 1256 | ov_out_of_sync_print(mdev); |
b411b363 PR |
1257 | drbd_resync_finished(mdev); |
1258 | } | |
1259 | ||
99920dc5 | 1260 | return err; |
b411b363 PR |
1261 | } |
1262 | ||
99920dc5 | 1263 | int w_prev_work_done(struct drbd_work *w, int cancel) |
b411b363 PR |
1264 | { |
1265 | struct drbd_wq_barrier *b = container_of(w, struct drbd_wq_barrier, w); | |
00d56944 | 1266 | |
b411b363 | 1267 | complete(&b->done); |
99920dc5 | 1268 | return 0; |
b411b363 PR |
1269 | } |
1270 | ||
b6dd1a89 LE |
1271 | /* FIXME |
1272 | * We need to track the number of pending barrier acks, | |
1273 | * and to be able to wait for them. | |
1274 | * See also comment in drbd_adm_attach before drbd_suspend_io. | |
1275 | */ | |
1276 | int drbd_send_barrier(struct drbd_tconn *tconn) | |
b411b363 | 1277 | { |
9f5bdc33 | 1278 | struct p_barrier *p; |
b6dd1a89 | 1279 | struct drbd_socket *sock; |
b411b363 | 1280 | |
b6dd1a89 LE |
1281 | sock = &tconn->data; |
1282 | p = conn_prepare_command(tconn, sock); | |
9f5bdc33 AG |
1283 | if (!p) |
1284 | return -EIO; | |
b6dd1a89 LE |
1285 | p->barrier = tconn->send.current_epoch_nr; |
1286 | p->pad = 0; | |
1287 | tconn->send.current_epoch_writes = 0; | |
1288 | ||
1289 | return conn_send_command(tconn, sock, P_BARRIER, sizeof(*p), NULL, 0); | |
b411b363 PR |
1290 | } |
1291 | ||
99920dc5 | 1292 | int w_send_write_hint(struct drbd_work *w, int cancel) |
b411b363 | 1293 | { |
00d56944 | 1294 | struct drbd_conf *mdev = w->mdev; |
9f5bdc33 AG |
1295 | struct drbd_socket *sock; |
1296 | ||
b411b363 | 1297 | if (cancel) |
99920dc5 | 1298 | return 0; |
9f5bdc33 AG |
1299 | sock = &mdev->tconn->data; |
1300 | if (!drbd_prepare_command(mdev, sock)) | |
1301 | return -EIO; | |
e658983a | 1302 | return drbd_send_command(mdev, sock, P_UNPLUG_REMOTE, 0, NULL, 0); |
b411b363 PR |
1303 | } |
1304 | ||
4eb9b3cb LE |
1305 | static void re_init_if_first_write(struct drbd_tconn *tconn, unsigned int epoch) |
1306 | { | |
1307 | if (!tconn->send.seen_any_write_yet) { | |
1308 | tconn->send.seen_any_write_yet = true; | |
1309 | tconn->send.current_epoch_nr = epoch; | |
1310 | tconn->send.current_epoch_writes = 0; | |
1311 | } | |
1312 | } | |
1313 | ||
1314 | static void maybe_send_barrier(struct drbd_tconn *tconn, unsigned int epoch) | |
1315 | { | |
1316 | /* re-init if first write on this connection */ | |
1317 | if (!tconn->send.seen_any_write_yet) | |
1318 | return; | |
1319 | if (tconn->send.current_epoch_nr != epoch) { | |
1320 | if (tconn->send.current_epoch_writes) | |
1321 | drbd_send_barrier(tconn); | |
1322 | tconn->send.current_epoch_nr = epoch; | |
1323 | } | |
1324 | } | |
1325 | ||
8f7bed77 | 1326 | int w_send_out_of_sync(struct drbd_work *w, int cancel) |
73a01a18 PR |
1327 | { |
1328 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
00d56944 | 1329 | struct drbd_conf *mdev = w->mdev; |
b6dd1a89 | 1330 | struct drbd_tconn *tconn = mdev->tconn; |
99920dc5 | 1331 | int err; |
73a01a18 PR |
1332 | |
1333 | if (unlikely(cancel)) { | |
8554df1c | 1334 | req_mod(req, SEND_CANCELED); |
99920dc5 | 1335 | return 0; |
73a01a18 PR |
1336 | } |
1337 | ||
b6dd1a89 LE |
1338 | /* this time, no tconn->send.current_epoch_writes++; |
1339 | * If it was sent, it was the closing barrier for the last | |
1340 | * replicated epoch, before we went into AHEAD mode. | |
1341 | * No more barriers will be sent, until we leave AHEAD mode again. */ | |
4eb9b3cb | 1342 | maybe_send_barrier(tconn, req->epoch); |
b6dd1a89 | 1343 | |
8f7bed77 | 1344 | err = drbd_send_out_of_sync(mdev, req); |
8554df1c | 1345 | req_mod(req, OOS_HANDED_TO_NETWORK); |
73a01a18 | 1346 | |
99920dc5 | 1347 | return err; |
73a01a18 PR |
1348 | } |
1349 | ||
b411b363 PR |
1350 | /** |
1351 | * w_send_dblock() - Worker callback to send a P_DATA packet in order to mirror a write request | |
1352 | * @mdev: DRBD device. | |
1353 | * @w: work object. | |
1354 | * @cancel: The connection will be closed anyways | |
1355 | */ | |
99920dc5 | 1356 | int w_send_dblock(struct drbd_work *w, int cancel) |
b411b363 PR |
1357 | { |
1358 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
00d56944 | 1359 | struct drbd_conf *mdev = w->mdev; |
b6dd1a89 | 1360 | struct drbd_tconn *tconn = mdev->tconn; |
99920dc5 | 1361 | int err; |
b411b363 PR |
1362 | |
1363 | if (unlikely(cancel)) { | |
8554df1c | 1364 | req_mod(req, SEND_CANCELED); |
99920dc5 | 1365 | return 0; |
b411b363 PR |
1366 | } |
1367 | ||
4eb9b3cb LE |
1368 | re_init_if_first_write(tconn, req->epoch); |
1369 | maybe_send_barrier(tconn, req->epoch); | |
b6dd1a89 LE |
1370 | tconn->send.current_epoch_writes++; |
1371 | ||
99920dc5 AG |
1372 | err = drbd_send_dblock(mdev, req); |
1373 | req_mod(req, err ? SEND_FAILED : HANDED_OVER_TO_NETWORK); | |
b411b363 | 1374 | |
99920dc5 | 1375 | return err; |
b411b363 PR |
1376 | } |
1377 | ||
1378 | /** | |
1379 | * w_send_read_req() - Worker callback to send a read request (P_DATA_REQUEST) packet | |
1380 | * @mdev: DRBD device. | |
1381 | * @w: work object. | |
1382 | * @cancel: The connection will be closed anyways | |
1383 | */ | |
99920dc5 | 1384 | int w_send_read_req(struct drbd_work *w, int cancel) |
b411b363 PR |
1385 | { |
1386 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
00d56944 | 1387 | struct drbd_conf *mdev = w->mdev; |
b6dd1a89 | 1388 | struct drbd_tconn *tconn = mdev->tconn; |
99920dc5 | 1389 | int err; |
b411b363 PR |
1390 | |
1391 | if (unlikely(cancel)) { | |
8554df1c | 1392 | req_mod(req, SEND_CANCELED); |
99920dc5 | 1393 | return 0; |
b411b363 PR |
1394 | } |
1395 | ||
b6dd1a89 LE |
1396 | /* Even read requests may close a write epoch, |
1397 | * if there was any yet. */ | |
4eb9b3cb | 1398 | maybe_send_barrier(tconn, req->epoch); |
b6dd1a89 | 1399 | |
99920dc5 | 1400 | err = drbd_send_drequest(mdev, P_DATA_REQUEST, req->i.sector, req->i.size, |
6c1005e7 | 1401 | (unsigned long)req); |
b411b363 | 1402 | |
99920dc5 | 1403 | req_mod(req, err ? SEND_FAILED : HANDED_OVER_TO_NETWORK); |
b411b363 | 1404 | |
99920dc5 | 1405 | return err; |
b411b363 PR |
1406 | } |
1407 | ||
99920dc5 | 1408 | int w_restart_disk_io(struct drbd_work *w, int cancel) |
265be2d0 PR |
1409 | { |
1410 | struct drbd_request *req = container_of(w, struct drbd_request, w); | |
00d56944 | 1411 | struct drbd_conf *mdev = w->mdev; |
265be2d0 | 1412 | |
0778286a | 1413 | if (bio_data_dir(req->master_bio) == WRITE && req->rq_state & RQ_IN_ACT_LOG) |
56392d2f | 1414 | drbd_al_begin_io(mdev, &req->i, false); |
265be2d0 PR |
1415 | |
1416 | drbd_req_make_private_bio(req, req->master_bio); | |
1417 | req->private_bio->bi_bdev = mdev->ldev->backing_bdev; | |
1418 | generic_make_request(req->private_bio); | |
1419 | ||
99920dc5 | 1420 | return 0; |
265be2d0 PR |
1421 | } |
1422 | ||
b411b363 PR |
1423 | static int _drbd_may_sync_now(struct drbd_conf *mdev) |
1424 | { | |
1425 | struct drbd_conf *odev = mdev; | |
95f8efd0 | 1426 | int resync_after; |
b411b363 PR |
1427 | |
1428 | while (1) { | |
a3f8f7dc | 1429 | if (!odev->ldev || odev->state.disk == D_DISKLESS) |
438c8374 | 1430 | return 1; |
daeda1cc | 1431 | rcu_read_lock(); |
95f8efd0 | 1432 | resync_after = rcu_dereference(odev->ldev->disk_conf)->resync_after; |
daeda1cc | 1433 | rcu_read_unlock(); |
95f8efd0 | 1434 | if (resync_after == -1) |
b411b363 | 1435 | return 1; |
95f8efd0 | 1436 | odev = minor_to_mdev(resync_after); |
a3f8f7dc | 1437 | if (!odev) |
841ce241 | 1438 | return 1; |
b411b363 PR |
1439 | if ((odev->state.conn >= C_SYNC_SOURCE && |
1440 | odev->state.conn <= C_PAUSED_SYNC_T) || | |
1441 | odev->state.aftr_isp || odev->state.peer_isp || | |
1442 | odev->state.user_isp) | |
1443 | return 0; | |
1444 | } | |
1445 | } | |
1446 | ||
1447 | /** | |
1448 | * _drbd_pause_after() - Pause resync on all devices that may not resync now | |
1449 | * @mdev: DRBD device. | |
1450 | * | |
1451 | * Called from process context only (admin command and after_state_ch). | |
1452 | */ | |
1453 | static int _drbd_pause_after(struct drbd_conf *mdev) | |
1454 | { | |
1455 | struct drbd_conf *odev; | |
1456 | int i, rv = 0; | |
1457 | ||
695d08fa | 1458 | rcu_read_lock(); |
81a5d60e | 1459 | idr_for_each_entry(&minors, odev, i) { |
b411b363 PR |
1460 | if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS) |
1461 | continue; | |
1462 | if (!_drbd_may_sync_now(odev)) | |
1463 | rv |= (__drbd_set_state(_NS(odev, aftr_isp, 1), CS_HARD, NULL) | |
1464 | != SS_NOTHING_TO_DO); | |
1465 | } | |
695d08fa | 1466 | rcu_read_unlock(); |
b411b363 PR |
1467 | |
1468 | return rv; | |
1469 | } | |
1470 | ||
1471 | /** | |
1472 | * _drbd_resume_next() - Resume resync on all devices that may resync now | |
1473 | * @mdev: DRBD device. | |
1474 | * | |
1475 | * Called from process context only (admin command and worker). | |
1476 | */ | |
1477 | static int _drbd_resume_next(struct drbd_conf *mdev) | |
1478 | { | |
1479 | struct drbd_conf *odev; | |
1480 | int i, rv = 0; | |
1481 | ||
695d08fa | 1482 | rcu_read_lock(); |
81a5d60e | 1483 | idr_for_each_entry(&minors, odev, i) { |
b411b363 PR |
1484 | if (odev->state.conn == C_STANDALONE && odev->state.disk == D_DISKLESS) |
1485 | continue; | |
1486 | if (odev->state.aftr_isp) { | |
1487 | if (_drbd_may_sync_now(odev)) | |
1488 | rv |= (__drbd_set_state(_NS(odev, aftr_isp, 0), | |
1489 | CS_HARD, NULL) | |
1490 | != SS_NOTHING_TO_DO) ; | |
1491 | } | |
1492 | } | |
695d08fa | 1493 | rcu_read_unlock(); |
b411b363 PR |
1494 | return rv; |
1495 | } | |
1496 | ||
1497 | void resume_next_sg(struct drbd_conf *mdev) | |
1498 | { | |
1499 | write_lock_irq(&global_state_lock); | |
1500 | _drbd_resume_next(mdev); | |
1501 | write_unlock_irq(&global_state_lock); | |
1502 | } | |
1503 | ||
1504 | void suspend_other_sg(struct drbd_conf *mdev) | |
1505 | { | |
1506 | write_lock_irq(&global_state_lock); | |
1507 | _drbd_pause_after(mdev); | |
1508 | write_unlock_irq(&global_state_lock); | |
1509 | } | |
1510 | ||
dc97b708 | 1511 | /* caller must hold global_state_lock */ |
95f8efd0 | 1512 | enum drbd_ret_code drbd_resync_after_valid(struct drbd_conf *mdev, int o_minor) |
b411b363 PR |
1513 | { |
1514 | struct drbd_conf *odev; | |
95f8efd0 | 1515 | int resync_after; |
b411b363 PR |
1516 | |
1517 | if (o_minor == -1) | |
1518 | return NO_ERROR; | |
a3f8f7dc | 1519 | if (o_minor < -1 || o_minor > MINORMASK) |
95f8efd0 | 1520 | return ERR_RESYNC_AFTER; |
b411b363 PR |
1521 | |
1522 | /* check for loops */ | |
1523 | odev = minor_to_mdev(o_minor); | |
1524 | while (1) { | |
1525 | if (odev == mdev) | |
95f8efd0 | 1526 | return ERR_RESYNC_AFTER_CYCLE; |
b411b363 | 1527 | |
a3f8f7dc LE |
1528 | /* You are free to depend on diskless, non-existing, |
1529 | * or not yet/no longer existing minors. | |
1530 | * We only reject dependency loops. | |
1531 | * We cannot follow the dependency chain beyond a detached or | |
1532 | * missing minor. | |
1533 | */ | |
1534 | if (!odev || !odev->ldev || odev->state.disk == D_DISKLESS) | |
1535 | return NO_ERROR; | |
1536 | ||
daeda1cc | 1537 | rcu_read_lock(); |
95f8efd0 | 1538 | resync_after = rcu_dereference(odev->ldev->disk_conf)->resync_after; |
daeda1cc | 1539 | rcu_read_unlock(); |
b411b363 | 1540 | /* dependency chain ends here, no cycles. */ |
95f8efd0 | 1541 | if (resync_after == -1) |
b411b363 PR |
1542 | return NO_ERROR; |
1543 | ||
1544 | /* follow the dependency chain */ | |
95f8efd0 | 1545 | odev = minor_to_mdev(resync_after); |
b411b363 PR |
1546 | } |
1547 | } | |
1548 | ||
dc97b708 | 1549 | /* caller must hold global_state_lock */ |
95f8efd0 | 1550 | void drbd_resync_after_changed(struct drbd_conf *mdev) |
b411b363 PR |
1551 | { |
1552 | int changes; | |
b411b363 | 1553 | |
dc97b708 PR |
1554 | do { |
1555 | changes = _drbd_pause_after(mdev); | |
1556 | changes |= _drbd_resume_next(mdev); | |
1557 | } while (changes); | |
b411b363 PR |
1558 | } |
1559 | ||
9bd28d3c LE |
1560 | void drbd_rs_controller_reset(struct drbd_conf *mdev) |
1561 | { | |
813472ce PR |
1562 | struct fifo_buffer *plan; |
1563 | ||
9bd28d3c LE |
1564 | atomic_set(&mdev->rs_sect_in, 0); |
1565 | atomic_set(&mdev->rs_sect_ev, 0); | |
1566 | mdev->rs_in_flight = 0; | |
813472ce PR |
1567 | |
1568 | /* Updating the RCU protected object in place is necessary since | |
1569 | this function gets called from atomic context. | |
1570 | It is valid since all other updates also lead to an completely | |
1571 | empty fifo */ | |
1572 | rcu_read_lock(); | |
1573 | plan = rcu_dereference(mdev->rs_plan_s); | |
1574 | plan->total = 0; | |
1575 | fifo_set(plan, 0); | |
1576 | rcu_read_unlock(); | |
9bd28d3c LE |
1577 | } |
1578 | ||
1f04af33 PR |
1579 | void start_resync_timer_fn(unsigned long data) |
1580 | { | |
1581 | struct drbd_conf *mdev = (struct drbd_conf *) data; | |
1582 | ||
d5b27b01 | 1583 | drbd_queue_work(&mdev->tconn->sender_work, &mdev->start_resync_work); |
1f04af33 PR |
1584 | } |
1585 | ||
99920dc5 | 1586 | int w_start_resync(struct drbd_work *w, int cancel) |
1f04af33 | 1587 | { |
00d56944 PR |
1588 | struct drbd_conf *mdev = w->mdev; |
1589 | ||
1f04af33 PR |
1590 | if (atomic_read(&mdev->unacked_cnt) || atomic_read(&mdev->rs_pending_cnt)) { |
1591 | dev_warn(DEV, "w_start_resync later...\n"); | |
1592 | mdev->start_resync_timer.expires = jiffies + HZ/10; | |
1593 | add_timer(&mdev->start_resync_timer); | |
99920dc5 | 1594 | return 0; |
1f04af33 PR |
1595 | } |
1596 | ||
1597 | drbd_start_resync(mdev, C_SYNC_SOURCE); | |
36baf611 | 1598 | clear_bit(AHEAD_TO_SYNC_SOURCE, &mdev->flags); |
99920dc5 | 1599 | return 0; |
1f04af33 PR |
1600 | } |
1601 | ||
b411b363 PR |
1602 | /** |
1603 | * drbd_start_resync() - Start the resync process | |
1604 | * @mdev: DRBD device. | |
1605 | * @side: Either C_SYNC_SOURCE or C_SYNC_TARGET | |
1606 | * | |
1607 | * This function might bring you directly into one of the | |
1608 | * C_PAUSED_SYNC_* states. | |
1609 | */ | |
1610 | void drbd_start_resync(struct drbd_conf *mdev, enum drbd_conns side) | |
1611 | { | |
1612 | union drbd_state ns; | |
1613 | int r; | |
1614 | ||
c4752ef1 | 1615 | if (mdev->state.conn >= C_SYNC_SOURCE && mdev->state.conn < C_AHEAD) { |
b411b363 PR |
1616 | dev_err(DEV, "Resync already running!\n"); |
1617 | return; | |
1618 | } | |
1619 | ||
e64a3294 PR |
1620 | if (!test_bit(B_RS_H_DONE, &mdev->flags)) { |
1621 | if (side == C_SYNC_TARGET) { | |
1622 | /* Since application IO was locked out during C_WF_BITMAP_T and | |
1623 | C_WF_SYNC_UUID we are still unmodified. Before going to C_SYNC_TARGET | |
1624 | we check that we might make the data inconsistent. */ | |
1625 | r = drbd_khelper(mdev, "before-resync-target"); | |
1626 | r = (r >> 8) & 0xff; | |
1627 | if (r > 0) { | |
1628 | dev_info(DEV, "before-resync-target handler returned %d, " | |
09b9e797 | 1629 | "dropping connection.\n", r); |
38fa9988 | 1630 | conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
09b9e797 PR |
1631 | return; |
1632 | } | |
e64a3294 PR |
1633 | } else /* C_SYNC_SOURCE */ { |
1634 | r = drbd_khelper(mdev, "before-resync-source"); | |
1635 | r = (r >> 8) & 0xff; | |
1636 | if (r > 0) { | |
1637 | if (r == 3) { | |
1638 | dev_info(DEV, "before-resync-source handler returned %d, " | |
1639 | "ignoring. Old userland tools?", r); | |
1640 | } else { | |
1641 | dev_info(DEV, "before-resync-source handler returned %d, " | |
1642 | "dropping connection.\n", r); | |
38fa9988 | 1643 | conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
e64a3294 PR |
1644 | return; |
1645 | } | |
1646 | } | |
09b9e797 | 1647 | } |
b411b363 PR |
1648 | } |
1649 | ||
e64a3294 | 1650 | if (current == mdev->tconn->worker.task) { |
dad20554 | 1651 | /* The worker should not sleep waiting for state_mutex, |
e64a3294 | 1652 | that can take long */ |
8410da8f | 1653 | if (!mutex_trylock(mdev->state_mutex)) { |
e64a3294 PR |
1654 | set_bit(B_RS_H_DONE, &mdev->flags); |
1655 | mdev->start_resync_timer.expires = jiffies + HZ/5; | |
1656 | add_timer(&mdev->start_resync_timer); | |
1657 | return; | |
1658 | } | |
1659 | } else { | |
8410da8f | 1660 | mutex_lock(mdev->state_mutex); |
e64a3294 PR |
1661 | } |
1662 | clear_bit(B_RS_H_DONE, &mdev->flags); | |
b411b363 | 1663 | |
0cfac5dd | 1664 | write_lock_irq(&global_state_lock); |
a700471b PR |
1665 | /* Did some connection breakage or IO error race with us? */ |
1666 | if (mdev->state.conn < C_CONNECTED | |
1667 | || !get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
0cfac5dd | 1668 | write_unlock_irq(&global_state_lock); |
8410da8f | 1669 | mutex_unlock(mdev->state_mutex); |
b411b363 PR |
1670 | return; |
1671 | } | |
1672 | ||
78bae59b | 1673 | ns = drbd_read_state(mdev); |
b411b363 PR |
1674 | |
1675 | ns.aftr_isp = !_drbd_may_sync_now(mdev); | |
1676 | ||
1677 | ns.conn = side; | |
1678 | ||
1679 | if (side == C_SYNC_TARGET) | |
1680 | ns.disk = D_INCONSISTENT; | |
1681 | else /* side == C_SYNC_SOURCE */ | |
1682 | ns.pdsk = D_INCONSISTENT; | |
1683 | ||
1684 | r = __drbd_set_state(mdev, ns, CS_VERBOSE, NULL); | |
78bae59b | 1685 | ns = drbd_read_state(mdev); |
b411b363 PR |
1686 | |
1687 | if (ns.conn < C_CONNECTED) | |
1688 | r = SS_UNKNOWN_ERROR; | |
1689 | ||
1690 | if (r == SS_SUCCESS) { | |
1d7734a0 LE |
1691 | unsigned long tw = drbd_bm_total_weight(mdev); |
1692 | unsigned long now = jiffies; | |
1693 | int i; | |
1694 | ||
b411b363 PR |
1695 | mdev->rs_failed = 0; |
1696 | mdev->rs_paused = 0; | |
b411b363 | 1697 | mdev->rs_same_csum = 0; |
0f0601f4 LE |
1698 | mdev->rs_last_events = 0; |
1699 | mdev->rs_last_sect_ev = 0; | |
1d7734a0 LE |
1700 | mdev->rs_total = tw; |
1701 | mdev->rs_start = now; | |
1702 | for (i = 0; i < DRBD_SYNC_MARKS; i++) { | |
1703 | mdev->rs_mark_left[i] = tw; | |
1704 | mdev->rs_mark_time[i] = now; | |
1705 | } | |
b411b363 PR |
1706 | _drbd_pause_after(mdev); |
1707 | } | |
1708 | write_unlock_irq(&global_state_lock); | |
5a22db89 | 1709 | |
b411b363 | 1710 | if (r == SS_SUCCESS) { |
328e0f12 PR |
1711 | /* reset rs_last_bcast when a resync or verify is started, |
1712 | * to deal with potential jiffies wrap. */ | |
1713 | mdev->rs_last_bcast = jiffies - HZ; | |
1714 | ||
b411b363 PR |
1715 | dev_info(DEV, "Began resync as %s (will sync %lu KB [%lu bits set]).\n", |
1716 | drbd_conn_str(ns.conn), | |
1717 | (unsigned long) mdev->rs_total << (BM_BLOCK_SHIFT-10), | |
1718 | (unsigned long) mdev->rs_total); | |
6c922ed5 LE |
1719 | if (side == C_SYNC_TARGET) |
1720 | mdev->bm_resync_fo = 0; | |
1721 | ||
1722 | /* Since protocol 96, we must serialize drbd_gen_and_send_sync_uuid | |
1723 | * with w_send_oos, or the sync target will get confused as to | |
1724 | * how much bits to resync. We cannot do that always, because for an | |
1725 | * empty resync and protocol < 95, we need to do it here, as we call | |
1726 | * drbd_resync_finished from here in that case. | |
1727 | * We drbd_gen_and_send_sync_uuid here for protocol < 96, | |
1728 | * and from after_state_ch otherwise. */ | |
31890f4a | 1729 | if (side == C_SYNC_SOURCE && mdev->tconn->agreed_pro_version < 96) |
6c922ed5 | 1730 | drbd_gen_and_send_sync_uuid(mdev); |
b411b363 | 1731 | |
31890f4a | 1732 | if (mdev->tconn->agreed_pro_version < 95 && mdev->rs_total == 0) { |
af85e8e8 LE |
1733 | /* This still has a race (about when exactly the peers |
1734 | * detect connection loss) that can lead to a full sync | |
1735 | * on next handshake. In 8.3.9 we fixed this with explicit | |
1736 | * resync-finished notifications, but the fix | |
1737 | * introduces a protocol change. Sleeping for some | |
1738 | * time longer than the ping interval + timeout on the | |
1739 | * SyncSource, to give the SyncTarget the chance to | |
1740 | * detect connection loss, then waiting for a ping | |
1741 | * response (implicit in drbd_resync_finished) reduces | |
1742 | * the race considerably, but does not solve it. */ | |
44ed167d PR |
1743 | if (side == C_SYNC_SOURCE) { |
1744 | struct net_conf *nc; | |
1745 | int timeo; | |
1746 | ||
1747 | rcu_read_lock(); | |
1748 | nc = rcu_dereference(mdev->tconn->net_conf); | |
1749 | timeo = nc->ping_int * HZ + nc->ping_timeo * HZ / 9; | |
1750 | rcu_read_unlock(); | |
1751 | schedule_timeout_interruptible(timeo); | |
1752 | } | |
b411b363 | 1753 | drbd_resync_finished(mdev); |
b411b363 PR |
1754 | } |
1755 | ||
9bd28d3c | 1756 | drbd_rs_controller_reset(mdev); |
b411b363 PR |
1757 | /* ns.conn may already be != mdev->state.conn, |
1758 | * we may have been paused in between, or become paused until | |
1759 | * the timer triggers. | |
1760 | * No matter, that is handled in resync_timer_fn() */ | |
1761 | if (ns.conn == C_SYNC_TARGET) | |
1762 | mod_timer(&mdev->resync_timer, jiffies); | |
1763 | ||
1764 | drbd_md_sync(mdev); | |
1765 | } | |
5a22db89 | 1766 | put_ldev(mdev); |
8410da8f | 1767 | mutex_unlock(mdev->state_mutex); |
b411b363 PR |
1768 | } |
1769 | ||
b6dd1a89 LE |
1770 | /* If the resource already closed the current epoch, but we did not |
1771 | * (because we have not yet seen new requests), we should send the | |
1772 | * corresponding barrier now. Must be checked within the same spinlock | |
1773 | * that is used to check for new requests. */ | |
1774 | bool need_to_send_barrier(struct drbd_tconn *connection) | |
1775 | { | |
1776 | if (!connection->send.seen_any_write_yet) | |
1777 | return false; | |
1778 | ||
1779 | /* Skip barriers that do not contain any writes. | |
1780 | * This may happen during AHEAD mode. */ | |
1781 | if (!connection->send.current_epoch_writes) | |
1782 | return false; | |
1783 | ||
1784 | /* ->req_lock is held when requests are queued on | |
1785 | * connection->sender_work, and put into ->transfer_log. | |
1786 | * It is also held when ->current_tle_nr is increased. | |
1787 | * So either there are already new requests queued, | |
1788 | * and corresponding barriers will be send there. | |
1789 | * Or nothing new is queued yet, so the difference will be 1. | |
1790 | */ | |
1791 | if (atomic_read(&connection->current_tle_nr) != | |
1792 | connection->send.current_epoch_nr + 1) | |
1793 | return false; | |
1794 | ||
1795 | return true; | |
1796 | } | |
1797 | ||
8c0785a5 LE |
1798 | bool dequeue_work_batch(struct drbd_work_queue *queue, struct list_head *work_list) |
1799 | { | |
1800 | spin_lock_irq(&queue->q_lock); | |
1801 | list_splice_init(&queue->q, work_list); | |
1802 | spin_unlock_irq(&queue->q_lock); | |
1803 | return !list_empty(work_list); | |
1804 | } | |
1805 | ||
1806 | bool dequeue_work_item(struct drbd_work_queue *queue, struct list_head *work_list) | |
1807 | { | |
1808 | spin_lock_irq(&queue->q_lock); | |
1809 | if (!list_empty(&queue->q)) | |
1810 | list_move(queue->q.next, work_list); | |
1811 | spin_unlock_irq(&queue->q_lock); | |
1812 | return !list_empty(work_list); | |
1813 | } | |
1814 | ||
b6dd1a89 LE |
1815 | void wait_for_work(struct drbd_tconn *connection, struct list_head *work_list) |
1816 | { | |
1817 | DEFINE_WAIT(wait); | |
1818 | struct net_conf *nc; | |
1819 | int uncork, cork; | |
1820 | ||
1821 | dequeue_work_item(&connection->sender_work, work_list); | |
1822 | if (!list_empty(work_list)) | |
1823 | return; | |
1824 | ||
1825 | /* Still nothing to do? | |
1826 | * Maybe we still need to close the current epoch, | |
1827 | * even if no new requests are queued yet. | |
1828 | * | |
1829 | * Also, poke TCP, just in case. | |
1830 | * Then wait for new work (or signal). */ | |
1831 | rcu_read_lock(); | |
1832 | nc = rcu_dereference(connection->net_conf); | |
1833 | uncork = nc ? nc->tcp_cork : 0; | |
1834 | rcu_read_unlock(); | |
1835 | if (uncork) { | |
1836 | mutex_lock(&connection->data.mutex); | |
1837 | if (connection->data.socket) | |
1838 | drbd_tcp_uncork(connection->data.socket); | |
1839 | mutex_unlock(&connection->data.mutex); | |
1840 | } | |
1841 | ||
1842 | for (;;) { | |
1843 | int send_barrier; | |
1844 | prepare_to_wait(&connection->sender_work.q_wait, &wait, TASK_INTERRUPTIBLE); | |
1845 | spin_lock_irq(&connection->req_lock); | |
1846 | spin_lock(&connection->sender_work.q_lock); /* FIXME get rid of this one? */ | |
bc317a9e LE |
1847 | /* dequeue single item only, |
1848 | * we still use drbd_queue_work_front() in some places */ | |
1849 | if (!list_empty(&connection->sender_work.q)) | |
1850 | list_move(connection->sender_work.q.next, work_list); | |
b6dd1a89 LE |
1851 | spin_unlock(&connection->sender_work.q_lock); /* FIXME get rid of this one? */ |
1852 | if (!list_empty(work_list) || signal_pending(current)) { | |
1853 | spin_unlock_irq(&connection->req_lock); | |
1854 | break; | |
1855 | } | |
1856 | send_barrier = need_to_send_barrier(connection); | |
1857 | spin_unlock_irq(&connection->req_lock); | |
1858 | if (send_barrier) { | |
1859 | drbd_send_barrier(connection); | |
1860 | connection->send.current_epoch_nr++; | |
1861 | } | |
1862 | schedule(); | |
1863 | /* may be woken up for other things but new work, too, | |
1864 | * e.g. if the current epoch got closed. | |
1865 | * In which case we send the barrier above. */ | |
1866 | } | |
1867 | finish_wait(&connection->sender_work.q_wait, &wait); | |
1868 | ||
1869 | /* someone may have changed the config while we have been waiting above. */ | |
1870 | rcu_read_lock(); | |
1871 | nc = rcu_dereference(connection->net_conf); | |
1872 | cork = nc ? nc->tcp_cork : 0; | |
1873 | rcu_read_unlock(); | |
1874 | mutex_lock(&connection->data.mutex); | |
1875 | if (connection->data.socket) { | |
1876 | if (cork) | |
1877 | drbd_tcp_cork(connection->data.socket); | |
1878 | else if (!uncork) | |
1879 | drbd_tcp_uncork(connection->data.socket); | |
1880 | } | |
1881 | mutex_unlock(&connection->data.mutex); | |
1882 | } | |
1883 | ||
b411b363 PR |
1884 | int drbd_worker(struct drbd_thread *thi) |
1885 | { | |
392c8801 | 1886 | struct drbd_tconn *tconn = thi->tconn; |
b411b363 | 1887 | struct drbd_work *w = NULL; |
0e29d163 | 1888 | struct drbd_conf *mdev; |
b411b363 | 1889 | LIST_HEAD(work_list); |
8c0785a5 | 1890 | int vnr; |
b411b363 | 1891 | |
e77a0a5c | 1892 | while (get_t_state(thi) == RUNNING) { |
80822284 | 1893 | drbd_thread_current_set_cpu(thi); |
b411b363 | 1894 | |
8c0785a5 LE |
1895 | /* as long as we use drbd_queue_work_front(), |
1896 | * we may only dequeue single work items here, not batches. */ | |
1897 | if (list_empty(&work_list)) | |
b6dd1a89 | 1898 | wait_for_work(tconn, &work_list); |
b411b363 | 1899 | |
8c0785a5 | 1900 | if (signal_pending(current)) { |
b411b363 | 1901 | flush_signals(current); |
19393e10 PR |
1902 | if (get_t_state(thi) == RUNNING) { |
1903 | conn_warn(tconn, "Worker got an unexpected signal\n"); | |
b411b363 | 1904 | continue; |
19393e10 | 1905 | } |
b411b363 PR |
1906 | break; |
1907 | } | |
1908 | ||
e77a0a5c | 1909 | if (get_t_state(thi) != RUNNING) |
b411b363 | 1910 | break; |
b411b363 | 1911 | |
8c0785a5 LE |
1912 | while (!list_empty(&work_list)) { |
1913 | w = list_first_entry(&work_list, struct drbd_work, list); | |
1914 | list_del_init(&w->list); | |
1915 | if (w->cb(w, tconn->cstate < C_WF_REPORT_PARAMS) == 0) | |
1916 | continue; | |
bbeb641c PR |
1917 | if (tconn->cstate >= C_WF_REPORT_PARAMS) |
1918 | conn_request_state(tconn, NS(conn, C_NETWORK_FAILURE), CS_HARD); | |
b411b363 PR |
1919 | } |
1920 | } | |
b411b363 | 1921 | |
8c0785a5 | 1922 | do { |
b411b363 | 1923 | while (!list_empty(&work_list)) { |
8c0785a5 | 1924 | w = list_first_entry(&work_list, struct drbd_work, list); |
b411b363 | 1925 | list_del_init(&w->list); |
00d56944 | 1926 | w->cb(w, 1); |
b411b363 | 1927 | } |
d5b27b01 | 1928 | dequeue_work_batch(&tconn->sender_work, &work_list); |
8c0785a5 | 1929 | } while (!list_empty(&work_list)); |
b411b363 | 1930 | |
c141ebda | 1931 | rcu_read_lock(); |
f399002e | 1932 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { |
0e29d163 | 1933 | D_ASSERT(mdev->state.disk == D_DISKLESS && mdev->state.conn == C_STANDALONE); |
c141ebda PR |
1934 | kref_get(&mdev->kref); |
1935 | rcu_read_unlock(); | |
0e29d163 | 1936 | drbd_mdev_cleanup(mdev); |
c141ebda PR |
1937 | kref_put(&mdev->kref, &drbd_minor_destroy); |
1938 | rcu_read_lock(); | |
0e29d163 | 1939 | } |
c141ebda | 1940 | rcu_read_unlock(); |
b411b363 PR |
1941 | |
1942 | return 0; | |
1943 | } |