4 This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
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>.
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)
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.
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.
26 #include <linux/module.h>
27 #include <linux/drbd.h>
28 #include <linux/sched.h>
29 #include <linux/wait.h>
31 #include <linux/memcontrol.h>
32 #include <linux/mm_inline.h>
33 #include <linux/slab.h>
34 #include <linux/random.h>
35 #include <linux/string.h>
36 #include <linux/scatterlist.h>
41 static int w_make_ov_request(struct drbd_conf
*mdev
, struct drbd_work
*w
, int cancel
);
42 static int w_make_resync_request(struct drbd_conf
*mdev
,
43 struct drbd_work
*w
, int cancel
);
52 * more endio handlers:
53 atodb_endio in drbd_actlog.c
54 drbd_bm_async_io_complete in drbd_bitmap.c
56 * For all these callbacks, note the following:
57 * The callbacks will be called in irq context by the IDE drivers,
58 * and in Softirqs/Tasklets/BH context by the SCSI drivers.
59 * Try to get the locking right :)
64 /* About the global_state_lock
65 Each state transition on an device holds a read lock. In case we have
66 to evaluate the sync after dependencies, we grab a write lock, because
67 we need stable states on all devices for that. */
68 rwlock_t global_state_lock
;
70 /* used for synchronous meta data and bitmap IO
71 * submitted by drbd_md_sync_page_io()
73 void drbd_md_io_complete(struct bio
*bio
, int error
)
75 struct drbd_md_io
*md_io
;
77 md_io
= (struct drbd_md_io
*)bio
->bi_private
;
80 complete(&md_io
->event
);
83 /* reads on behalf of the partner,
84 * "submitted" by the receiver
86 void drbd_endio_read_sec_final(struct drbd_epoch_entry
*e
) __releases(local
)
88 unsigned long flags
= 0;
89 struct drbd_conf
*mdev
= e
->mdev
;
91 D_ASSERT(e
->block_id
!= ID_VACANT
);
93 spin_lock_irqsave(&mdev
->req_lock
, flags
);
94 mdev
->read_cnt
+= e
->size
>> 9;
96 if (list_empty(&mdev
->read_ee
))
97 wake_up(&mdev
->ee_wait
);
98 if (test_bit(__EE_WAS_ERROR
, &e
->flags
))
99 __drbd_chk_io_error(mdev
, false);
100 spin_unlock_irqrestore(&mdev
->req_lock
, flags
);
102 drbd_queue_work(&mdev
->data
.work
, &e
->w
);
106 /* writes on behalf of the partner, or resync writes,
107 * "submitted" by the receiver, final stage. */
108 static void drbd_endio_write_sec_final(struct drbd_epoch_entry
*e
) __releases(local
)
110 unsigned long flags
= 0;
111 struct drbd_conf
*mdev
= e
->mdev
;
115 int do_al_complete_io
;
117 D_ASSERT(e
->block_id
!= ID_VACANT
);
119 /* after we moved e to done_ee,
120 * we may no longer access it,
121 * it may be freed/reused already!
122 * (as soon as we release the req_lock) */
123 e_sector
= e
->sector
;
124 do_al_complete_io
= e
->flags
& EE_CALL_AL_COMPLETE_IO
;
125 is_syncer_req
= is_syncer_block_id(e
->block_id
);
127 spin_lock_irqsave(&mdev
->req_lock
, flags
);
128 mdev
->writ_cnt
+= e
->size
>> 9;
129 list_del(&e
->w
.list
); /* has been on active_ee or sync_ee */
130 list_add_tail(&e
->w
.list
, &mdev
->done_ee
);
132 /* No hlist_del_init(&e->colision) here, we did not send the Ack yet,
133 * neither did we wake possibly waiting conflicting requests.
134 * done from "drbd_process_done_ee" within the appropriate w.cb
135 * (e_end_block/e_end_resync_block) or from _drbd_clear_done_ee */
137 do_wake
= is_syncer_req
138 ? list_empty(&mdev
->sync_ee
)
139 : list_empty(&mdev
->active_ee
);
141 if (test_bit(__EE_WAS_ERROR
, &e
->flags
))
142 __drbd_chk_io_error(mdev
, false);
143 spin_unlock_irqrestore(&mdev
->req_lock
, flags
);
146 drbd_rs_complete_io(mdev
, e_sector
);
149 wake_up(&mdev
->ee_wait
);
151 if (do_al_complete_io
)
152 drbd_al_complete_io(mdev
, e_sector
);
158 /* writes on behalf of the partner, or resync writes,
159 * "submitted" by the receiver.
161 void drbd_endio_sec(struct bio
*bio
, int error
)
163 struct drbd_epoch_entry
*e
= bio
->bi_private
;
164 struct drbd_conf
*mdev
= e
->mdev
;
165 int uptodate
= bio_flagged(bio
, BIO_UPTODATE
);
166 int is_write
= bio_data_dir(bio
) == WRITE
;
168 if (error
&& __ratelimit(&drbd_ratelimit_state
))
169 dev_warn(DEV
, "%s: error=%d s=%llus\n",
170 is_write
? "write" : "read", error
,
171 (unsigned long long)e
->sector
);
172 if (!error
&& !uptodate
) {
173 if (__ratelimit(&drbd_ratelimit_state
))
174 dev_warn(DEV
, "%s: setting error to -EIO s=%llus\n",
175 is_write
? "write" : "read",
176 (unsigned long long)e
->sector
);
177 /* strange behavior of some lower level drivers...
178 * fail the request by clearing the uptodate flag,
179 * but do not return any error?! */
184 set_bit(__EE_WAS_ERROR
, &e
->flags
);
186 bio_put(bio
); /* no need for the bio anymore */
187 if (atomic_dec_and_test(&e
->pending_bios
)) {
189 drbd_endio_write_sec_final(e
);
191 drbd_endio_read_sec_final(e
);
195 /* read, readA or write requests on R_PRIMARY coming from drbd_make_request
197 void drbd_endio_pri(struct bio
*bio
, int error
)
200 struct drbd_request
*req
= bio
->bi_private
;
201 struct drbd_conf
*mdev
= req
->mdev
;
202 struct bio_and_error m
;
203 enum drbd_req_event what
;
204 int uptodate
= bio_flagged(bio
, BIO_UPTODATE
);
206 if (!error
&& !uptodate
) {
207 dev_warn(DEV
, "p %s: setting error to -EIO\n",
208 bio_data_dir(bio
) == WRITE
? "write" : "read");
209 /* strange behavior of some lower level drivers...
210 * fail the request by clearing the uptodate flag,
211 * but do not return any error?! */
215 /* to avoid recursion in __req_mod */
216 if (unlikely(error
)) {
217 what
= (bio_data_dir(bio
) == WRITE
)
218 ? write_completed_with_error
219 : (bio_rw(bio
) == READ
)
220 ? read_completed_with_error
221 : read_ahead_completed_with_error
;
225 bio_put(req
->private_bio
);
226 req
->private_bio
= ERR_PTR(error
);
228 /* not req_mod(), we need irqsave here! */
229 spin_lock_irqsave(&mdev
->req_lock
, flags
);
230 __req_mod(req
, what
, &m
);
231 spin_unlock_irqrestore(&mdev
->req_lock
, flags
);
234 complete_master_bio(mdev
, &m
);
237 int w_read_retry_remote(struct drbd_conf
*mdev
, struct drbd_work
*w
, int cancel
)
239 struct drbd_request
*req
= container_of(w
, struct drbd_request
, w
);
241 /* We should not detach for read io-error,
242 * but try to WRITE the P_DATA_REPLY to the failed location,
243 * to give the disk the chance to relocate that block */
245 spin_lock_irq(&mdev
->req_lock
);
246 if (cancel
|| mdev
->state
.pdsk
!= D_UP_TO_DATE
) {
247 _req_mod(req
, read_retry_remote_canceled
);
248 spin_unlock_irq(&mdev
->req_lock
);
251 spin_unlock_irq(&mdev
->req_lock
);
253 return w_send_read_req(mdev
, w
, 0);
256 void drbd_csum_ee(struct drbd_conf
*mdev
, struct crypto_hash
*tfm
, struct drbd_epoch_entry
*e
, void *digest
)
258 struct hash_desc desc
;
259 struct scatterlist sg
;
260 struct page
*page
= e
->pages
;
267 sg_init_table(&sg
, 1);
268 crypto_hash_init(&desc
);
270 while ((tmp
= page_chain_next(page
))) {
271 /* all but the last page will be fully used */
272 sg_set_page(&sg
, page
, PAGE_SIZE
, 0);
273 crypto_hash_update(&desc
, &sg
, sg
.length
);
276 /* and now the last, possibly only partially used page */
277 len
= e
->size
& (PAGE_SIZE
- 1);
278 sg_set_page(&sg
, page
, len
?: PAGE_SIZE
, 0);
279 crypto_hash_update(&desc
, &sg
, sg
.length
);
280 crypto_hash_final(&desc
, digest
);
283 void drbd_csum_bio(struct drbd_conf
*mdev
, struct crypto_hash
*tfm
, struct bio
*bio
, void *digest
)
285 struct hash_desc desc
;
286 struct scatterlist sg
;
287 struct bio_vec
*bvec
;
293 sg_init_table(&sg
, 1);
294 crypto_hash_init(&desc
);
296 __bio_for_each_segment(bvec
, bio
, i
, 0) {
297 sg_set_page(&sg
, bvec
->bv_page
, bvec
->bv_len
, bvec
->bv_offset
);
298 crypto_hash_update(&desc
, &sg
, sg
.length
);
300 crypto_hash_final(&desc
, digest
);
303 static int w_e_send_csum(struct drbd_conf
*mdev
, struct drbd_work
*w
, int cancel
)
305 struct drbd_epoch_entry
*e
= container_of(w
, struct drbd_epoch_entry
, w
);
310 D_ASSERT(e
->block_id
== DRBD_MAGIC
+ 0xbeef);
312 if (unlikely(cancel
)) {
313 drbd_free_ee(mdev
, e
);
317 if (likely((e
->flags
& EE_WAS_ERROR
) == 0)) {
318 digest_size
= crypto_hash_digestsize(mdev
->csums_tfm
);
319 digest
= kmalloc(digest_size
, GFP_NOIO
);
321 drbd_csum_ee(mdev
, mdev
->csums_tfm
, e
, digest
);
323 inc_rs_pending(mdev
);
324 ok
= drbd_send_drequest_csum(mdev
,
332 dev_err(DEV
, "kmalloc() of digest failed.\n");
338 drbd_free_ee(mdev
, e
);
341 dev_err(DEV
, "drbd_send_drequest(..., csum) failed\n");
345 #define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN)
347 static int read_for_csum(struct drbd_conf
*mdev
, sector_t sector
, int size
)
349 struct drbd_epoch_entry
*e
;
354 if (drbd_rs_should_slow_down(mdev
, sector
))
357 /* GFP_TRY, because if there is no memory available right now, this may
358 * be rescheduled for later. It is "only" background resync, after all. */
359 e
= drbd_alloc_ee(mdev
, DRBD_MAGIC
+0xbeef, sector
, size
, GFP_TRY
);
363 e
->w
.cb
= w_e_send_csum
;
364 spin_lock_irq(&mdev
->req_lock
);
365 list_add(&e
->w
.list
, &mdev
->read_ee
);
366 spin_unlock_irq(&mdev
->req_lock
);
368 atomic_add(size
>> 9, &mdev
->rs_sect_ev
);
369 if (drbd_submit_ee(mdev
, e
, READ
, DRBD_FAULT_RS_RD
) == 0)
372 /* If it failed because of ENOMEM, retry should help. If it failed
373 * because bio_add_page failed (probably broken lower level driver),
374 * retry may or may not help.
375 * If it does not, you may need to force disconnect. */
376 spin_lock_irq(&mdev
->req_lock
);
377 list_del(&e
->w
.list
);
378 spin_unlock_irq(&mdev
->req_lock
);
380 drbd_free_ee(mdev
, e
);
386 int w_resync_timer(struct drbd_conf
*mdev
, struct drbd_work
*w
, int cancel
)
388 switch (mdev
->state
.conn
) {
390 w_make_ov_request(mdev
, w
, cancel
);
393 w_make_resync_request(mdev
, w
, cancel
);
400 void resync_timer_fn(unsigned long data
)
402 struct drbd_conf
*mdev
= (struct drbd_conf
*) data
;
404 if (list_empty(&mdev
->resync_work
.list
))
405 drbd_queue_work(&mdev
->data
.work
, &mdev
->resync_work
);
408 static void fifo_set(struct fifo_buffer
*fb
, int value
)
412 for (i
= 0; i
< fb
->size
; i
++)
413 fb
->values
[i
] = value
;
416 static int fifo_push(struct fifo_buffer
*fb
, int value
)
420 ov
= fb
->values
[fb
->head_index
];
421 fb
->values
[fb
->head_index
++] = value
;
423 if (fb
->head_index
>= fb
->size
)
429 static void fifo_add_val(struct fifo_buffer
*fb
, int value
)
433 for (i
= 0; i
< fb
->size
; i
++)
434 fb
->values
[i
] += value
;
437 static int drbd_rs_controller(struct drbd_conf
*mdev
)
439 unsigned int sect_in
; /* Number of sectors that came in since the last turn */
440 unsigned int want
; /* The number of sectors we want in the proxy */
441 int req_sect
; /* Number of sectors to request in this turn */
442 int correction
; /* Number of sectors more we need in the proxy*/
443 int cps
; /* correction per invocation of drbd_rs_controller() */
444 int steps
; /* Number of time steps to plan ahead */
448 sect_in
= atomic_xchg(&mdev
->rs_sect_in
, 0); /* Number of sectors that came in */
449 mdev
->rs_in_flight
-= sect_in
;
451 spin_lock(&mdev
->peer_seq_lock
); /* get an atomic view on mdev->rs_plan_s */
453 steps
= mdev
->rs_plan_s
.size
; /* (mdev->sync_conf.c_plan_ahead * 10 * SLEEP_TIME) / HZ; */
455 if (mdev
->rs_in_flight
+ sect_in
== 0) { /* At start of resync */
456 want
= ((mdev
->sync_conf
.rate
* 2 * SLEEP_TIME
) / HZ
) * steps
;
457 } else { /* normal path */
458 want
= mdev
->sync_conf
.c_fill_target
? mdev
->sync_conf
.c_fill_target
:
459 sect_in
* mdev
->sync_conf
.c_delay_target
* HZ
/ (SLEEP_TIME
* 10);
462 correction
= want
- mdev
->rs_in_flight
- mdev
->rs_planed
;
465 cps
= correction
/ steps
;
466 fifo_add_val(&mdev
->rs_plan_s
, cps
);
467 mdev
->rs_planed
+= cps
* steps
;
469 /* What we do in this step */
470 curr_corr
= fifo_push(&mdev
->rs_plan_s
, 0);
471 spin_unlock(&mdev
->peer_seq_lock
);
472 mdev
->rs_planed
-= curr_corr
;
474 req_sect
= sect_in
+ curr_corr
;
478 max_sect
= (mdev
->sync_conf
.c_max_rate
* 2 * SLEEP_TIME
) / HZ
;
479 if (req_sect
> max_sect
)
483 dev_warn(DEV, "si=%u if=%d wa=%u co=%d st=%d cps=%d pl=%d cc=%d rs=%d\n",
484 sect_in, mdev->rs_in_flight, want, correction,
485 steps, cps, mdev->rs_planed, curr_corr, req_sect);
491 static int drbd_rs_number_requests(struct drbd_conf
*mdev
)
494 if (mdev
->rs_plan_s
.size
) { /* mdev->sync_conf.c_plan_ahead */
495 number
= drbd_rs_controller(mdev
) >> (BM_BLOCK_SHIFT
- 9);
496 mdev
->c_sync_rate
= number
* HZ
* (BM_BLOCK_SIZE
/ 1024) / SLEEP_TIME
;
498 mdev
->c_sync_rate
= mdev
->sync_conf
.rate
;
499 number
= SLEEP_TIME
* mdev
->c_sync_rate
/ ((BM_BLOCK_SIZE
/ 1024) * HZ
);
502 /* ignore the amount of pending requests, the resync controller should
503 * throttle down to incoming reply rate soon enough anyways. */
507 static int w_make_resync_request(struct drbd_conf
*mdev
,
508 struct drbd_work
*w
, int cancel
)
512 const sector_t capacity
= drbd_get_capacity(mdev
->this_bdev
);
514 int number
, rollback_i
, size
;
515 int align
, queued
, sndbuf
;
518 if (unlikely(cancel
))
521 if (mdev
->rs_total
== 0) {
523 drbd_resync_finished(mdev
);
527 if (!get_ldev(mdev
)) {
528 /* Since we only need to access mdev->rsync a
529 get_ldev_if_state(mdev,D_FAILED) would be sufficient, but
530 to continue resync with a broken disk makes no sense at
532 dev_err(DEV
, "Disk broke down during resync!\n");
536 /* starting with drbd 8.3.8, we can handle multi-bio EEs,
537 * if it should be necessary */
539 mdev
->agreed_pro_version
< 94 ? queue_max_hw_sectors(mdev
->rq_queue
) << 9 :
540 mdev
->agreed_pro_version
< 95 ? DRBD_MAX_SIZE_H80_PACKET
: DRBD_MAX_BIO_SIZE
;
542 number
= drbd_rs_number_requests(mdev
);
546 for (i
= 0; i
< number
; i
++) {
547 /* Stop generating RS requests, when half of the send buffer is filled */
548 mutex_lock(&mdev
->data
.mutex
);
549 if (mdev
->data
.socket
) {
550 queued
= mdev
->data
.socket
->sk
->sk_wmem_queued
;
551 sndbuf
= mdev
->data
.socket
->sk
->sk_sndbuf
;
556 mutex_unlock(&mdev
->data
.mutex
);
557 if (queued
> sndbuf
/ 2)
561 size
= BM_BLOCK_SIZE
;
562 bit
= drbd_bm_find_next(mdev
, mdev
->bm_resync_fo
);
564 if (bit
== DRBD_END_OF_BITMAP
) {
565 mdev
->bm_resync_fo
= drbd_bm_bits(mdev
);
570 sector
= BM_BIT_TO_SECT(bit
);
572 if (drbd_rs_should_slow_down(mdev
, sector
) ||
573 drbd_try_rs_begin_io(mdev
, sector
)) {
574 mdev
->bm_resync_fo
= bit
;
577 mdev
->bm_resync_fo
= bit
+ 1;
579 if (unlikely(drbd_bm_test_bit(mdev
, bit
) == 0)) {
580 drbd_rs_complete_io(mdev
, sector
);
584 #if DRBD_MAX_BIO_SIZE > BM_BLOCK_SIZE
585 /* try to find some adjacent bits.
586 * we stop if we have already the maximum req size.
588 * Additionally always align bigger requests, in order to
589 * be prepared for all stripe sizes of software RAIDs.
594 if (size
+ BM_BLOCK_SIZE
> max_bio_size
)
597 /* Be always aligned */
598 if (sector
& ((1<<(align
+3))-1))
601 /* do not cross extent boundaries */
602 if (((bit
+1) & BM_BLOCKS_PER_BM_EXT_MASK
) == 0)
604 /* now, is it actually dirty, after all?
605 * caution, drbd_bm_test_bit is tri-state for some
606 * obscure reason; ( b == 0 ) would get the out-of-band
607 * only accidentally right because of the "oddly sized"
608 * adjustment below */
609 if (drbd_bm_test_bit(mdev
, bit
+1) != 1)
612 size
+= BM_BLOCK_SIZE
;
613 if ((BM_BLOCK_SIZE
<< align
) <= size
)
617 /* if we merged some,
618 * reset the offset to start the next drbd_bm_find_next from */
619 if (size
> BM_BLOCK_SIZE
)
620 mdev
->bm_resync_fo
= bit
+ 1;
623 /* adjust very last sectors, in case we are oddly sized */
624 if (sector
+ (size
>>9) > capacity
)
625 size
= (capacity
-sector
)<<9;
626 if (mdev
->agreed_pro_version
>= 89 && mdev
->csums_tfm
) {
627 switch (read_for_csum(mdev
, sector
, size
)) {
628 case -EIO
: /* Disk failure */
631 case -EAGAIN
: /* allocation failed, or ldev busy */
632 drbd_rs_complete_io(mdev
, sector
);
633 mdev
->bm_resync_fo
= BM_SECT_TO_BIT(sector
);
643 inc_rs_pending(mdev
);
644 if (!drbd_send_drequest(mdev
, P_RS_DATA_REQUEST
,
645 sector
, size
, ID_SYNCER
)) {
646 dev_err(DEV
, "drbd_send_drequest() failed, aborting...\n");
647 dec_rs_pending(mdev
);
654 if (mdev
->bm_resync_fo
>= drbd_bm_bits(mdev
)) {
655 /* last syncer _request_ was sent,
656 * but the P_RS_DATA_REPLY not yet received. sync will end (and
657 * next sync group will resume), as soon as we receive the last
658 * resync data block, and the last bit is cleared.
659 * until then resync "work" is "inactive" ...
666 mdev
->rs_in_flight
+= (i
<< (BM_BLOCK_SHIFT
- 9));
667 mod_timer(&mdev
->resync_timer
, jiffies
+ SLEEP_TIME
);
672 static int w_make_ov_request(struct drbd_conf
*mdev
, struct drbd_work
*w
, int cancel
)
676 const sector_t capacity
= drbd_get_capacity(mdev
->this_bdev
);
678 if (unlikely(cancel
))
681 number
= drbd_rs_number_requests(mdev
);
683 sector
= mdev
->ov_position
;
684 for (i
= 0; i
< number
; i
++) {
685 if (sector
>= capacity
) {
689 size
= BM_BLOCK_SIZE
;
691 if (drbd_rs_should_slow_down(mdev
, sector
) ||
692 drbd_try_rs_begin_io(mdev
, sector
)) {
693 mdev
->ov_position
= sector
;
697 if (sector
+ (size
>>9) > capacity
)
698 size
= (capacity
-sector
)<<9;
700 inc_rs_pending(mdev
);
701 if (!drbd_send_ov_request(mdev
, sector
, size
)) {
702 dec_rs_pending(mdev
);
705 sector
+= BM_SECT_PER_BIT
;
707 mdev
->ov_position
= sector
;
710 mdev
->rs_in_flight
+= (i
<< (BM_BLOCK_SHIFT
- 9));
711 mod_timer(&mdev
->resync_timer
, jiffies
+ SLEEP_TIME
);
716 void start_resync_timer_fn(unsigned long data
)
718 struct drbd_conf
*mdev
= (struct drbd_conf
*) data
;
720 drbd_queue_work(&mdev
->data
.work
, &mdev
->start_resync_work
);
723 int w_start_resync(struct drbd_conf
*mdev
, struct drbd_work
*w
, int cancel
)
725 if (atomic_read(&mdev
->unacked_cnt
) || atomic_read(&mdev
->rs_pending_cnt
)) {
726 dev_warn(DEV
, "w_start_resync later...\n");
727 mdev
->start_resync_timer
.expires
= jiffies
+ HZ
/10;
728 add_timer(&mdev
->start_resync_timer
);
732 drbd_start_resync(mdev
, C_SYNC_SOURCE
);
733 clear_bit(AHEAD_TO_SYNC_SOURCE
, &mdev
->current_epoch
->flags
);
737 int w_ov_finished(struct drbd_conf
*mdev
, struct drbd_work
*w
, int cancel
)
741 drbd_resync_finished(mdev
);
746 static int w_resync_finished(struct drbd_conf
*mdev
, struct drbd_work
*w
, int cancel
)
750 drbd_resync_finished(mdev
);
755 static void ping_peer(struct drbd_conf
*mdev
)
757 clear_bit(GOT_PING_ACK
, &mdev
->flags
);
759 wait_event(mdev
->misc_wait
,
760 test_bit(GOT_PING_ACK
, &mdev
->flags
) || mdev
->state
.conn
< C_CONNECTED
);
763 int drbd_resync_finished(struct drbd_conf
*mdev
)
765 unsigned long db
, dt
, dbdt
;
767 union drbd_state os
, ns
;
769 char *khelper_cmd
= NULL
;
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. */
781 schedule_timeout_interruptible(HZ
/ 10);
782 w
= kmalloc(sizeof(struct drbd_work
), GFP_ATOMIC
);
784 w
->cb
= w_resync_finished
;
785 drbd_queue_work(&mdev
->data
.work
, w
);
788 dev_err(DEV
, "Warn failed to drbd_rs_del_all() and to kmalloc(w).\n");
791 dt
= (jiffies
- mdev
->rs_start
- mdev
->rs_paused
) / HZ
;
795 dbdt
= Bit2KB(db
/dt
);
796 mdev
->rs_paused
/= HZ
;
803 spin_lock_irq(&mdev
->req_lock
);
806 verify_done
= (os
.conn
== C_VERIFY_S
|| os
.conn
== C_VERIFY_T
);
808 /* This protects us against multiple calls (that can happen in the presence
809 of application IO), and against connectivity loss just before we arrive here. */
810 if (os
.conn
<= C_CONNECTED
)
814 ns
.conn
= C_CONNECTED
;
816 dev_info(DEV
, "%s done (total %lu sec; paused %lu sec; %lu K/sec)\n",
817 verify_done
? "Online verify " : "Resync",
818 dt
+ mdev
->rs_paused
, mdev
->rs_paused
, dbdt
);
820 n_oos
= drbd_bm_total_weight(mdev
);
822 if (os
.conn
== C_VERIFY_S
|| os
.conn
== C_VERIFY_T
) {
824 dev_alert(DEV
, "Online verify found %lu %dk block out of sync!\n",
826 khelper_cmd
= "out-of-sync";
829 D_ASSERT((n_oos
- mdev
->rs_failed
) == 0);
831 if (os
.conn
== C_SYNC_TARGET
|| os
.conn
== C_PAUSED_SYNC_T
)
832 khelper_cmd
= "after-resync-target";
834 if (mdev
->csums_tfm
&& mdev
->rs_total
) {
835 const unsigned long s
= mdev
->rs_same_csum
;
836 const unsigned long t
= mdev
->rs_total
;
839 (t
< 100000) ? ((s
*100)/t
) : (s
/(t
/100));
840 dev_info(DEV
, "%u %% had equal check sums, eliminated: %luK; "
841 "transferred %luK total %luK\n",
843 Bit2KB(mdev
->rs_same_csum
),
844 Bit2KB(mdev
->rs_total
- mdev
->rs_same_csum
),
845 Bit2KB(mdev
->rs_total
));
849 if (mdev
->rs_failed
) {
850 dev_info(DEV
, " %lu failed blocks\n", mdev
->rs_failed
);
852 if (os
.conn
== C_SYNC_TARGET
|| os
.conn
== C_PAUSED_SYNC_T
) {
853 ns
.disk
= D_INCONSISTENT
;
854 ns
.pdsk
= D_UP_TO_DATE
;
856 ns
.disk
= D_UP_TO_DATE
;
857 ns
.pdsk
= D_INCONSISTENT
;
860 ns
.disk
= D_UP_TO_DATE
;
861 ns
.pdsk
= D_UP_TO_DATE
;
863 if (os
.conn
== C_SYNC_TARGET
|| os
.conn
== C_PAUSED_SYNC_T
) {
866 for (i
= UI_BITMAP
; i
<= UI_HISTORY_END
; i
++)
867 _drbd_uuid_set(mdev
, i
, mdev
->p_uuid
[i
]);
868 drbd_uuid_set(mdev
, UI_BITMAP
, mdev
->ldev
->md
.uuid
[UI_CURRENT
]);
869 _drbd_uuid_set(mdev
, UI_CURRENT
, mdev
->p_uuid
[UI_CURRENT
]);
871 dev_err(DEV
, "mdev->p_uuid is NULL! BUG\n");
875 if (!(os
.conn
== C_VERIFY_S
|| os
.conn
== C_VERIFY_T
)) {
876 /* for verify runs, we don't update uuids here,
877 * so there would be nothing to report. */
878 drbd_uuid_set_bm(mdev
, 0UL);
879 drbd_print_uuids(mdev
, "updated UUIDs");
881 /* Now the two UUID sets are equal, update what we
882 * know of the peer. */
884 for (i
= UI_CURRENT
; i
<= UI_HISTORY_END
; i
++)
885 mdev
->p_uuid
[i
] = mdev
->ldev
->md
.uuid
[i
];
890 _drbd_set_state(mdev
, ns
, CS_VERBOSE
, NULL
);
892 spin_unlock_irq(&mdev
->req_lock
);
899 mdev
->ov_start_sector
= 0;
904 drbd_khelper(mdev
, khelper_cmd
);
910 static void move_to_net_ee_or_free(struct drbd_conf
*mdev
, struct drbd_epoch_entry
*e
)
912 if (drbd_ee_has_active_page(e
)) {
913 /* This might happen if sendpage() has not finished */
914 int i
= (e
->size
+ PAGE_SIZE
-1) >> PAGE_SHIFT
;
915 atomic_add(i
, &mdev
->pp_in_use_by_net
);
916 atomic_sub(i
, &mdev
->pp_in_use
);
917 spin_lock_irq(&mdev
->req_lock
);
918 list_add_tail(&e
->w
.list
, &mdev
->net_ee
);
919 spin_unlock_irq(&mdev
->req_lock
);
920 wake_up(&drbd_pp_wait
);
922 drbd_free_ee(mdev
, e
);
926 * w_e_end_data_req() - Worker callback, to send a P_DATA_REPLY packet in response to a P_DATA_REQUEST
927 * @mdev: DRBD device.
929 * @cancel: The connection will be closed anyways
931 int w_e_end_data_req(struct drbd_conf
*mdev
, struct drbd_work
*w
, int cancel
)
933 struct drbd_epoch_entry
*e
= container_of(w
, struct drbd_epoch_entry
, w
);
936 if (unlikely(cancel
)) {
937 drbd_free_ee(mdev
, e
);
942 if (likely((e
->flags
& EE_WAS_ERROR
) == 0)) {
943 ok
= drbd_send_block(mdev
, P_DATA_REPLY
, e
);
945 if (__ratelimit(&drbd_ratelimit_state
))
946 dev_err(DEV
, "Sending NegDReply. sector=%llus.\n",
947 (unsigned long long)e
->sector
);
949 ok
= drbd_send_ack(mdev
, P_NEG_DREPLY
, e
);
954 move_to_net_ee_or_free(mdev
, e
);
957 dev_err(DEV
, "drbd_send_block() failed\n");
962 * w_e_end_rsdata_req() - Worker callback to send a P_RS_DATA_REPLY packet in response to a P_RS_DATA_REQUESTRS
963 * @mdev: DRBD device.
965 * @cancel: The connection will be closed anyways
967 int w_e_end_rsdata_req(struct drbd_conf
*mdev
, struct drbd_work
*w
, int cancel
)
969 struct drbd_epoch_entry
*e
= container_of(w
, struct drbd_epoch_entry
, w
);
972 if (unlikely(cancel
)) {
973 drbd_free_ee(mdev
, e
);
978 if (get_ldev_if_state(mdev
, D_FAILED
)) {
979 drbd_rs_complete_io(mdev
, e
->sector
);
983 if (mdev
->state
.conn
== C_AHEAD
) {
984 ok
= drbd_send_ack(mdev
, P_RS_CANCEL
, e
);
985 } else if (likely((e
->flags
& EE_WAS_ERROR
) == 0)) {
986 if (likely(mdev
->state
.pdsk
>= D_INCONSISTENT
)) {
987 inc_rs_pending(mdev
);
988 ok
= drbd_send_block(mdev
, P_RS_DATA_REPLY
, e
);
990 if (__ratelimit(&drbd_ratelimit_state
))
991 dev_err(DEV
, "Not sending RSDataReply, "
992 "partner DISKLESS!\n");
996 if (__ratelimit(&drbd_ratelimit_state
))
997 dev_err(DEV
, "Sending NegRSDReply. sector %llus.\n",
998 (unsigned long long)e
->sector
);
1000 ok
= drbd_send_ack(mdev
, P_NEG_RS_DREPLY
, e
);
1002 /* update resync data with failure */
1003 drbd_rs_failed_io(mdev
, e
->sector
, e
->size
);
1008 move_to_net_ee_or_free(mdev
, e
);
1011 dev_err(DEV
, "drbd_send_block() failed\n");
1015 int w_e_end_csum_rs_req(struct drbd_conf
*mdev
, struct drbd_work
*w
, int cancel
)
1017 struct drbd_epoch_entry
*e
= container_of(w
, struct drbd_epoch_entry
, w
);
1018 struct digest_info
*di
;
1020 void *digest
= NULL
;
1023 if (unlikely(cancel
)) {
1024 drbd_free_ee(mdev
, e
);
1029 if (get_ldev(mdev
)) {
1030 drbd_rs_complete_io(mdev
, e
->sector
);
1036 if (likely((e
->flags
& EE_WAS_ERROR
) == 0)) {
1037 /* quick hack to try to avoid a race against reconfiguration.
1038 * a real fix would be much more involved,
1039 * introducing more locking mechanisms */
1040 if (mdev
->csums_tfm
) {
1041 digest_size
= crypto_hash_digestsize(mdev
->csums_tfm
);
1042 D_ASSERT(digest_size
== di
->digest_size
);
1043 digest
= kmalloc(digest_size
, GFP_NOIO
);
1046 drbd_csum_ee(mdev
, mdev
->csums_tfm
, e
, digest
);
1047 eq
= !memcmp(digest
, di
->digest
, digest_size
);
1052 drbd_set_in_sync(mdev
, e
->sector
, e
->size
);
1053 /* rs_same_csums unit is BM_BLOCK_SIZE */
1054 mdev
->rs_same_csum
+= e
->size
>> BM_BLOCK_SHIFT
;
1055 ok
= drbd_send_ack(mdev
, P_RS_IS_IN_SYNC
, e
);
1057 inc_rs_pending(mdev
);
1058 e
->block_id
= ID_SYNCER
; /* By setting block_id, digest pointer becomes invalid! */
1059 e
->flags
&= ~EE_HAS_DIGEST
; /* This e no longer has a digest pointer */
1061 ok
= drbd_send_block(mdev
, P_RS_DATA_REPLY
, e
);
1064 ok
= drbd_send_ack(mdev
, P_NEG_RS_DREPLY
, e
);
1065 if (__ratelimit(&drbd_ratelimit_state
))
1066 dev_err(DEV
, "Sending NegDReply. I guess it gets messy.\n");
1070 move_to_net_ee_or_free(mdev
, e
);
1073 dev_err(DEV
, "drbd_send_block/ack() failed\n");
1077 int w_e_end_ov_req(struct drbd_conf
*mdev
, struct drbd_work
*w
, int cancel
)
1079 struct drbd_epoch_entry
*e
= container_of(w
, struct drbd_epoch_entry
, w
);
1084 if (unlikely(cancel
))
1087 if (unlikely((e
->flags
& EE_WAS_ERROR
) != 0))
1090 digest_size
= crypto_hash_digestsize(mdev
->verify_tfm
);
1091 /* FIXME if this allocation fails, online verify will not terminate! */
1092 digest
= kmalloc(digest_size
, GFP_NOIO
);
1094 drbd_csum_ee(mdev
, mdev
->verify_tfm
, e
, digest
);
1095 inc_rs_pending(mdev
);
1096 ok
= drbd_send_drequest_csum(mdev
, e
->sector
, e
->size
,
1097 digest
, digest_size
, P_OV_REPLY
);
1099 dec_rs_pending(mdev
);
1104 drbd_free_ee(mdev
, e
);
1111 void drbd_ov_oos_found(struct drbd_conf
*mdev
, sector_t sector
, int size
)
1113 if (mdev
->ov_last_oos_start
+ mdev
->ov_last_oos_size
== sector
) {
1114 mdev
->ov_last_oos_size
+= size
>>9;
1116 mdev
->ov_last_oos_start
= sector
;
1117 mdev
->ov_last_oos_size
= size
>>9;
1119 drbd_set_out_of_sync(mdev
, sector
, size
);
1122 int w_e_end_ov_reply(struct drbd_conf
*mdev
, struct drbd_work
*w
, int cancel
)
1124 struct drbd_epoch_entry
*e
= container_of(w
, struct drbd_epoch_entry
, w
);
1125 struct digest_info
*di
;
1130 if (unlikely(cancel
)) {
1131 drbd_free_ee(mdev
, e
);
1136 /* after "cancel", because after drbd_disconnect/drbd_rs_cancel_all
1137 * the resync lru has been cleaned up already */
1138 if (get_ldev(mdev
)) {
1139 drbd_rs_complete_io(mdev
, e
->sector
);
1145 if (likely((e
->flags
& EE_WAS_ERROR
) == 0)) {
1146 digest_size
= crypto_hash_digestsize(mdev
->verify_tfm
);
1147 digest
= kmalloc(digest_size
, GFP_NOIO
);
1149 drbd_csum_ee(mdev
, mdev
->verify_tfm
, e
, digest
);
1151 D_ASSERT(digest_size
== di
->digest_size
);
1152 eq
= !memcmp(digest
, di
->digest
, digest_size
);
1156 ok
= drbd_send_ack(mdev
, P_NEG_RS_DREPLY
, e
);
1157 if (__ratelimit(&drbd_ratelimit_state
))
1158 dev_err(DEV
, "Sending NegDReply. I guess it gets messy.\n");
1163 drbd_ov_oos_found(mdev
, e
->sector
, e
->size
);
1167 ok
= drbd_send_ack_ex(mdev
, P_OV_RESULT
, e
->sector
, e
->size
,
1168 eq
? ID_IN_SYNC
: ID_OUT_OF_SYNC
);
1170 drbd_free_ee(mdev
, e
);
1174 /* let's advance progress step marks only for every other megabyte */
1175 if ((mdev
->ov_left
& 0x200) == 0x200)
1176 drbd_advance_rs_marks(mdev
, mdev
->ov_left
);
1178 if (mdev
->ov_left
== 0) {
1180 drbd_resync_finished(mdev
);
1186 int w_prev_work_done(struct drbd_conf
*mdev
, struct drbd_work
*w
, int cancel
)
1188 struct drbd_wq_barrier
*b
= container_of(w
, struct drbd_wq_barrier
, w
);
1193 int w_send_barrier(struct drbd_conf
*mdev
, struct drbd_work
*w
, int cancel
)
1195 struct drbd_tl_epoch
*b
= container_of(w
, struct drbd_tl_epoch
, w
);
1196 struct p_barrier
*p
= &mdev
->data
.sbuf
.barrier
;
1199 /* really avoid racing with tl_clear. w.cb may have been referenced
1200 * just before it was reassigned and re-queued, so double check that.
1201 * actually, this race was harmless, since we only try to send the
1202 * barrier packet here, and otherwise do nothing with the object.
1203 * but compare with the head of w_clear_epoch */
1204 spin_lock_irq(&mdev
->req_lock
);
1205 if (w
->cb
!= w_send_barrier
|| mdev
->state
.conn
< C_CONNECTED
)
1207 spin_unlock_irq(&mdev
->req_lock
);
1211 if (!drbd_get_data_sock(mdev
))
1213 p
->barrier
= b
->br_number
;
1214 /* inc_ap_pending was done where this was queued.
1215 * dec_ap_pending will be done in got_BarrierAck
1216 * or (on connection loss) in w_clear_epoch. */
1217 ok
= _drbd_send_cmd(mdev
, mdev
->data
.socket
, P_BARRIER
,
1218 (struct p_header80
*)p
, sizeof(*p
), 0);
1219 drbd_put_data_sock(mdev
);
1224 int w_send_write_hint(struct drbd_conf
*mdev
, struct drbd_work
*w
, int cancel
)
1228 return drbd_send_short_cmd(mdev
, P_UNPLUG_REMOTE
);
1231 int w_send_oos(struct drbd_conf
*mdev
, struct drbd_work
*w
, int cancel
)
1233 struct drbd_request
*req
= container_of(w
, struct drbd_request
, w
);
1236 if (unlikely(cancel
)) {
1237 req_mod(req
, send_canceled
);
1241 ok
= drbd_send_oos(mdev
, req
);
1242 req_mod(req
, oos_handed_to_network
);
1248 * w_send_dblock() - Worker callback to send a P_DATA packet in order to mirror a write request
1249 * @mdev: DRBD device.
1251 * @cancel: The connection will be closed anyways
1253 int w_send_dblock(struct drbd_conf
*mdev
, struct drbd_work
*w
, int cancel
)
1255 struct drbd_request
*req
= container_of(w
, struct drbd_request
, w
);
1258 if (unlikely(cancel
)) {
1259 req_mod(req
, send_canceled
);
1263 ok
= drbd_send_dblock(mdev
, req
);
1264 req_mod(req
, ok
? handed_over_to_network
: send_failed
);
1270 * w_send_read_req() - Worker callback to send a read request (P_DATA_REQUEST) packet
1271 * @mdev: DRBD device.
1273 * @cancel: The connection will be closed anyways
1275 int w_send_read_req(struct drbd_conf
*mdev
, struct drbd_work
*w
, int cancel
)
1277 struct drbd_request
*req
= container_of(w
, struct drbd_request
, w
);
1280 if (unlikely(cancel
)) {
1281 req_mod(req
, send_canceled
);
1285 ok
= drbd_send_drequest(mdev
, P_DATA_REQUEST
, req
->sector
, req
->size
,
1286 (unsigned long)req
);
1289 /* ?? we set C_TIMEOUT or C_BROKEN_PIPE in drbd_send();
1290 * so this is probably redundant */
1291 if (mdev
->state
.conn
>= C_CONNECTED
)
1292 drbd_force_state(mdev
, NS(conn
, C_NETWORK_FAILURE
));
1294 req_mod(req
, ok
? handed_over_to_network
: send_failed
);
1299 int w_restart_disk_io(struct drbd_conf
*mdev
, struct drbd_work
*w
, int cancel
)
1301 struct drbd_request
*req
= container_of(w
, struct drbd_request
, w
);
1303 if (bio_data_dir(req
->master_bio
) == WRITE
&& req
->rq_state
& RQ_IN_ACT_LOG
)
1304 drbd_al_begin_io(mdev
, req
->sector
);
1305 /* Calling drbd_al_begin_io() out of the worker might deadlocks
1306 theoretically. Practically it can not deadlock, since this is
1307 only used when unfreezing IOs. All the extents of the requests
1308 that made it into the TL are already active */
1310 drbd_req_make_private_bio(req
, req
->master_bio
);
1311 req
->private_bio
->bi_bdev
= mdev
->ldev
->backing_bdev
;
1312 generic_make_request(req
->private_bio
);
1317 static int _drbd_may_sync_now(struct drbd_conf
*mdev
)
1319 struct drbd_conf
*odev
= mdev
;
1322 if (odev
->sync_conf
.after
== -1)
1324 odev
= minor_to_mdev(odev
->sync_conf
.after
);
1325 ERR_IF(!odev
) return 1;
1326 if ((odev
->state
.conn
>= C_SYNC_SOURCE
&&
1327 odev
->state
.conn
<= C_PAUSED_SYNC_T
) ||
1328 odev
->state
.aftr_isp
|| odev
->state
.peer_isp
||
1329 odev
->state
.user_isp
)
1335 * _drbd_pause_after() - Pause resync on all devices that may not resync now
1336 * @mdev: DRBD device.
1338 * Called from process context only (admin command and after_state_ch).
1340 static int _drbd_pause_after(struct drbd_conf
*mdev
)
1342 struct drbd_conf
*odev
;
1345 for (i
= 0; i
< minor_count
; i
++) {
1346 odev
= minor_to_mdev(i
);
1349 if (odev
->state
.conn
== C_STANDALONE
&& odev
->state
.disk
== D_DISKLESS
)
1351 if (!_drbd_may_sync_now(odev
))
1352 rv
|= (__drbd_set_state(_NS(odev
, aftr_isp
, 1), CS_HARD
, NULL
)
1353 != SS_NOTHING_TO_DO
);
1360 * _drbd_resume_next() - Resume resync on all devices that may resync now
1361 * @mdev: DRBD device.
1363 * Called from process context only (admin command and worker).
1365 static int _drbd_resume_next(struct drbd_conf
*mdev
)
1367 struct drbd_conf
*odev
;
1370 for (i
= 0; i
< minor_count
; i
++) {
1371 odev
= minor_to_mdev(i
);
1374 if (odev
->state
.conn
== C_STANDALONE
&& odev
->state
.disk
== D_DISKLESS
)
1376 if (odev
->state
.aftr_isp
) {
1377 if (_drbd_may_sync_now(odev
))
1378 rv
|= (__drbd_set_state(_NS(odev
, aftr_isp
, 0),
1380 != SS_NOTHING_TO_DO
) ;
1386 void resume_next_sg(struct drbd_conf
*mdev
)
1388 write_lock_irq(&global_state_lock
);
1389 _drbd_resume_next(mdev
);
1390 write_unlock_irq(&global_state_lock
);
1393 void suspend_other_sg(struct drbd_conf
*mdev
)
1395 write_lock_irq(&global_state_lock
);
1396 _drbd_pause_after(mdev
);
1397 write_unlock_irq(&global_state_lock
);
1400 static int sync_after_error(struct drbd_conf
*mdev
, int o_minor
)
1402 struct drbd_conf
*odev
;
1406 if (o_minor
< -1 || minor_to_mdev(o_minor
) == NULL
)
1407 return ERR_SYNC_AFTER
;
1409 /* check for loops */
1410 odev
= minor_to_mdev(o_minor
);
1413 return ERR_SYNC_AFTER_CYCLE
;
1415 /* dependency chain ends here, no cycles. */
1416 if (odev
->sync_conf
.after
== -1)
1419 /* follow the dependency chain */
1420 odev
= minor_to_mdev(odev
->sync_conf
.after
);
1424 int drbd_alter_sa(struct drbd_conf
*mdev
, int na
)
1429 write_lock_irq(&global_state_lock
);
1430 retcode
= sync_after_error(mdev
, na
);
1431 if (retcode
== NO_ERROR
) {
1432 mdev
->sync_conf
.after
= na
;
1434 changes
= _drbd_pause_after(mdev
);
1435 changes
|= _drbd_resume_next(mdev
);
1438 write_unlock_irq(&global_state_lock
);
1442 void drbd_rs_controller_reset(struct drbd_conf
*mdev
)
1444 atomic_set(&mdev
->rs_sect_in
, 0);
1445 atomic_set(&mdev
->rs_sect_ev
, 0);
1446 mdev
->rs_in_flight
= 0;
1447 mdev
->rs_planed
= 0;
1448 spin_lock(&mdev
->peer_seq_lock
);
1449 fifo_set(&mdev
->rs_plan_s
, 0);
1450 spin_unlock(&mdev
->peer_seq_lock
);
1454 * drbd_start_resync() - Start the resync process
1455 * @mdev: DRBD device.
1456 * @side: Either C_SYNC_SOURCE or C_SYNC_TARGET
1458 * This function might bring you directly into one of the
1459 * C_PAUSED_SYNC_* states.
1461 void drbd_start_resync(struct drbd_conf
*mdev
, enum drbd_conns side
)
1463 union drbd_state ns
;
1466 if (mdev
->state
.conn
>= C_SYNC_SOURCE
&& mdev
->state
.conn
< C_AHEAD
) {
1467 dev_err(DEV
, "Resync already running!\n");
1471 if (mdev
->state
.conn
< C_AHEAD
) {
1472 /* In case a previous resync run was aborted by an IO error/detach on the peer. */
1473 drbd_rs_cancel_all(mdev
);
1474 /* This should be done when we abort the resync. We definitely do not
1475 want to have this for connections going back and forth between
1476 Ahead/Behind and SyncSource/SyncTarget */
1479 if (side
== C_SYNC_TARGET
) {
1480 /* Since application IO was locked out during C_WF_BITMAP_T and
1481 C_WF_SYNC_UUID we are still unmodified. Before going to C_SYNC_TARGET
1482 we check that we might make the data inconsistent. */
1483 r
= drbd_khelper(mdev
, "before-resync-target");
1484 r
= (r
>> 8) & 0xff;
1486 dev_info(DEV
, "before-resync-target handler returned %d, "
1487 "dropping connection.\n", r
);
1488 drbd_force_state(mdev
, NS(conn
, C_DISCONNECTING
));
1491 } else /* C_SYNC_SOURCE */ {
1492 r
= drbd_khelper(mdev
, "before-resync-source");
1493 r
= (r
>> 8) & 0xff;
1496 dev_info(DEV
, "before-resync-source handler returned %d, "
1497 "ignoring. Old userland tools?", r
);
1499 dev_info(DEV
, "before-resync-source handler returned %d, "
1500 "dropping connection.\n", r
);
1501 drbd_force_state(mdev
, NS(conn
, C_DISCONNECTING
));
1507 drbd_state_lock(mdev
);
1509 if (!get_ldev_if_state(mdev
, D_NEGOTIATING
)) {
1510 drbd_state_unlock(mdev
);
1514 write_lock_irq(&global_state_lock
);
1517 ns
.aftr_isp
= !_drbd_may_sync_now(mdev
);
1521 if (side
== C_SYNC_TARGET
)
1522 ns
.disk
= D_INCONSISTENT
;
1523 else /* side == C_SYNC_SOURCE */
1524 ns
.pdsk
= D_INCONSISTENT
;
1526 r
= __drbd_set_state(mdev
, ns
, CS_VERBOSE
, NULL
);
1529 if (ns
.conn
< C_CONNECTED
)
1530 r
= SS_UNKNOWN_ERROR
;
1532 if (r
== SS_SUCCESS
) {
1533 unsigned long tw
= drbd_bm_total_weight(mdev
);
1534 unsigned long now
= jiffies
;
1537 mdev
->rs_failed
= 0;
1538 mdev
->rs_paused
= 0;
1539 mdev
->rs_same_csum
= 0;
1540 mdev
->rs_last_events
= 0;
1541 mdev
->rs_last_sect_ev
= 0;
1542 mdev
->rs_total
= tw
;
1543 mdev
->rs_start
= now
;
1544 for (i
= 0; i
< DRBD_SYNC_MARKS
; i
++) {
1545 mdev
->rs_mark_left
[i
] = tw
;
1546 mdev
->rs_mark_time
[i
] = now
;
1548 _drbd_pause_after(mdev
);
1550 write_unlock_irq(&global_state_lock
);
1552 if (r
== SS_SUCCESS
) {
1553 dev_info(DEV
, "Began resync as %s (will sync %lu KB [%lu bits set]).\n",
1554 drbd_conn_str(ns
.conn
),
1555 (unsigned long) mdev
->rs_total
<< (BM_BLOCK_SHIFT
-10),
1556 (unsigned long) mdev
->rs_total
);
1557 if (side
== C_SYNC_TARGET
)
1558 mdev
->bm_resync_fo
= 0;
1560 /* Since protocol 96, we must serialize drbd_gen_and_send_sync_uuid
1561 * with w_send_oos, or the sync target will get confused as to
1562 * how much bits to resync. We cannot do that always, because for an
1563 * empty resync and protocol < 95, we need to do it here, as we call
1564 * drbd_resync_finished from here in that case.
1565 * We drbd_gen_and_send_sync_uuid here for protocol < 96,
1566 * and from after_state_ch otherwise. */
1567 if (side
== C_SYNC_SOURCE
&& mdev
->agreed_pro_version
< 96)
1568 drbd_gen_and_send_sync_uuid(mdev
);
1570 if (mdev
->agreed_pro_version
< 95 && mdev
->rs_total
== 0) {
1571 /* This still has a race (about when exactly the peers
1572 * detect connection loss) that can lead to a full sync
1573 * on next handshake. In 8.3.9 we fixed this with explicit
1574 * resync-finished notifications, but the fix
1575 * introduces a protocol change. Sleeping for some
1576 * time longer than the ping interval + timeout on the
1577 * SyncSource, to give the SyncTarget the chance to
1578 * detect connection loss, then waiting for a ping
1579 * response (implicit in drbd_resync_finished) reduces
1580 * the race considerably, but does not solve it. */
1581 if (side
== C_SYNC_SOURCE
)
1582 schedule_timeout_interruptible(
1583 mdev
->net_conf
->ping_int
* HZ
+
1584 mdev
->net_conf
->ping_timeo
*HZ
/9);
1585 drbd_resync_finished(mdev
);
1588 drbd_rs_controller_reset(mdev
);
1589 /* ns.conn may already be != mdev->state.conn,
1590 * we may have been paused in between, or become paused until
1591 * the timer triggers.
1592 * No matter, that is handled in resync_timer_fn() */
1593 if (ns
.conn
== C_SYNC_TARGET
)
1594 mod_timer(&mdev
->resync_timer
, jiffies
);
1599 drbd_state_unlock(mdev
);
1602 int drbd_worker(struct drbd_thread
*thi
)
1604 struct drbd_conf
*mdev
= thi
->mdev
;
1605 struct drbd_work
*w
= NULL
;
1606 LIST_HEAD(work_list
);
1609 sprintf(current
->comm
, "drbd%d_worker", mdev_to_minor(mdev
));
1611 while (get_t_state(thi
) == Running
) {
1612 drbd_thread_current_set_cpu(mdev
);
1614 if (down_trylock(&mdev
->data
.work
.s
)) {
1615 mutex_lock(&mdev
->data
.mutex
);
1616 if (mdev
->data
.socket
&& !mdev
->net_conf
->no_cork
)
1617 drbd_tcp_uncork(mdev
->data
.socket
);
1618 mutex_unlock(&mdev
->data
.mutex
);
1620 intr
= down_interruptible(&mdev
->data
.work
.s
);
1622 mutex_lock(&mdev
->data
.mutex
);
1623 if (mdev
->data
.socket
&& !mdev
->net_conf
->no_cork
)
1624 drbd_tcp_cork(mdev
->data
.socket
);
1625 mutex_unlock(&mdev
->data
.mutex
);
1629 D_ASSERT(intr
== -EINTR
);
1630 flush_signals(current
);
1631 ERR_IF (get_t_state(thi
) == Running
)
1636 if (get_t_state(thi
) != Running
)
1638 /* With this break, we have done a down() but not consumed
1639 the entry from the list. The cleanup code takes care of
1643 spin_lock_irq(&mdev
->data
.work
.q_lock
);
1644 ERR_IF(list_empty(&mdev
->data
.work
.q
)) {
1645 /* something terribly wrong in our logic.
1646 * we were able to down() the semaphore,
1647 * but the list is empty... doh.
1649 * what is the best thing to do now?
1650 * try again from scratch, restarting the receiver,
1651 * asender, whatnot? could break even more ugly,
1652 * e.g. when we are primary, but no good local data.
1654 * I'll try to get away just starting over this loop.
1656 spin_unlock_irq(&mdev
->data
.work
.q_lock
);
1659 w
= list_entry(mdev
->data
.work
.q
.next
, struct drbd_work
, list
);
1660 list_del_init(&w
->list
);
1661 spin_unlock_irq(&mdev
->data
.work
.q_lock
);
1663 if (!w
->cb(mdev
, w
, mdev
->state
.conn
< C_CONNECTED
)) {
1664 /* dev_warn(DEV, "worker: a callback failed! \n"); */
1665 if (mdev
->state
.conn
>= C_CONNECTED
)
1666 drbd_force_state(mdev
,
1667 NS(conn
, C_NETWORK_FAILURE
));
1670 D_ASSERT(test_bit(DEVICE_DYING
, &mdev
->flags
));
1671 D_ASSERT(test_bit(CONFIG_PENDING
, &mdev
->flags
));
1673 spin_lock_irq(&mdev
->data
.work
.q_lock
);
1675 while (!list_empty(&mdev
->data
.work
.q
)) {
1676 list_splice_init(&mdev
->data
.work
.q
, &work_list
);
1677 spin_unlock_irq(&mdev
->data
.work
.q_lock
);
1679 while (!list_empty(&work_list
)) {
1680 w
= list_entry(work_list
.next
, struct drbd_work
, list
);
1681 list_del_init(&w
->list
);
1683 i
++; /* dead debugging code */
1686 spin_lock_irq(&mdev
->data
.work
.q_lock
);
1688 sema_init(&mdev
->data
.work
.s
, 0);
1689 /* DANGEROUS race: if someone did queue his work within the spinlock,
1690 * but up() ed outside the spinlock, we could get an up() on the
1691 * semaphore without corresponding list entry.
1694 spin_unlock_irq(&mdev
->data
.work
.q_lock
);
1696 D_ASSERT(mdev
->state
.disk
== D_DISKLESS
&& mdev
->state
.conn
== C_STANDALONE
);
1697 /* _drbd_set_state only uses stop_nowait.
1698 * wait here for the Exiting receiver. */
1699 drbd_thread_stop(&mdev
->receiver
);
1700 drbd_mdev_cleanup(mdev
);
1702 dev_info(DEV
, "worker terminated\n");
1704 clear_bit(DEVICE_DYING
, &mdev
->flags
);
1705 clear_bit(CONFIG_PENDING
, &mdev
->flags
);
1706 wake_up(&mdev
->state_wait
);