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 Thanks to Carter Burden, Bart Grantham and Gennadiy Nerubayev
11 from Logicworks, Inc. for making SDP replication support possible.
13 drbd is free software; you can redistribute it and/or modify
14 it under the terms of the GNU General Public License as published by
15 the Free Software Foundation; either version 2, or (at your option)
18 drbd is distributed in the hope that it will be useful,
19 but WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 GNU General Public License for more details.
23 You should have received a copy of the GNU General Public License
24 along with drbd; see the file COPYING. If not, write to
25 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
29 #include <linux/module.h>
30 #include <linux/drbd.h>
31 #include <asm/uaccess.h>
32 #include <asm/types.h>
34 #include <linux/ctype.h>
35 #include <linux/mutex.h>
37 #include <linux/file.h>
38 #include <linux/proc_fs.h>
39 #include <linux/init.h>
41 #include <linux/memcontrol.h>
42 #include <linux/mm_inline.h>
43 #include <linux/slab.h>
44 #include <linux/random.h>
45 #include <linux/reboot.h>
46 #include <linux/notifier.h>
47 #include <linux/kthread.h>
49 #define __KERNEL_SYSCALLS__
50 #include <linux/unistd.h>
51 #include <linux/vmalloc.h>
53 #include <linux/drbd_limits.h>
55 #include "drbd_req.h" /* only for _req_mod in tl_release and tl_clear */
59 struct after_state_chg_work {
63 enum chg_state_flags flags;
64 struct completion *done;
67 static DEFINE_MUTEX(drbd_main_mutex);
68 int drbdd_init(struct drbd_thread *);
69 int drbd_worker(struct drbd_thread *);
70 int drbd_asender(struct drbd_thread *);
73 static int drbd_open(struct block_device *bdev, fmode_t mode);
74 static int drbd_release(struct gendisk *gd, fmode_t mode);
75 static int w_after_state_ch(struct drbd_conf *mdev, struct drbd_work *w, int unused);
76 static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
77 union drbd_state ns, enum chg_state_flags flags);
78 static int w_md_sync(struct drbd_conf *mdev, struct drbd_work *w, int unused);
79 static void md_sync_timer_fn(unsigned long data);
80 static int w_bitmap_io(struct drbd_conf *mdev, struct drbd_work *w, int unused);
81 static int w_go_diskless(struct drbd_conf *mdev, struct drbd_work *w, int unused);
83 MODULE_AUTHOR("Philipp Reisner <phil@linbit.com>, "
84 "Lars Ellenberg <lars@linbit.com>");
85 MODULE_DESCRIPTION("drbd - Distributed Replicated Block Device v" REL_VERSION);
86 MODULE_VERSION(REL_VERSION);
87 MODULE_LICENSE("GPL");
88 MODULE_PARM_DESC(minor_count, "Maximum number of drbd devices ("
89 __stringify(DRBD_MINOR_COUNT_MIN) "-" __stringify(DRBD_MINOR_COUNT_MAX) ")");
90 MODULE_ALIAS_BLOCKDEV_MAJOR(DRBD_MAJOR);
92 #include <linux/moduleparam.h>
93 /* allow_open_on_secondary */
94 MODULE_PARM_DESC(allow_oos, "DONT USE!");
95 /* thanks to these macros, if compiled into the kernel (not-module),
96 * this becomes the boot parameter drbd.minor_count */
97 module_param(minor_count, uint, 0444);
98 module_param(disable_sendpage, bool, 0644);
99 module_param(allow_oos, bool, 0);
100 module_param(cn_idx, uint, 0444);
101 module_param(proc_details, int, 0644);
103 #ifdef CONFIG_DRBD_FAULT_INJECTION
106 static int fault_count;
108 /* bitmap of enabled faults */
109 module_param(enable_faults, int, 0664);
110 /* fault rate % value - applies to all enabled faults */
111 module_param(fault_rate, int, 0664);
112 /* count of faults inserted */
113 module_param(fault_count, int, 0664);
114 /* bitmap of devices to insert faults on */
115 module_param(fault_devs, int, 0644);
118 /* module parameter, defined */
119 unsigned int minor_count = DRBD_MINOR_COUNT_DEF;
120 int disable_sendpage;
122 unsigned int cn_idx = CN_IDX_DRBD;
123 int proc_details; /* Detail level in proc drbd*/
125 /* Module parameter for setting the user mode helper program
126 * to run. Default is /sbin/drbdadm */
127 char usermode_helper[80] = "/sbin/drbdadm";
129 module_param_string(usermode_helper, usermode_helper, sizeof(usermode_helper), 0644);
131 /* in 2.6.x, our device mapping and config info contains our virtual gendisks
132 * as member "struct gendisk *vdisk;"
134 struct drbd_conf **minor_table;
136 struct kmem_cache *drbd_request_cache;
137 struct kmem_cache *drbd_ee_cache; /* epoch entries */
138 struct kmem_cache *drbd_bm_ext_cache; /* bitmap extents */
139 struct kmem_cache *drbd_al_ext_cache; /* activity log extents */
140 mempool_t *drbd_request_mempool;
141 mempool_t *drbd_ee_mempool;
143 /* I do not use a standard mempool, because:
144 1) I want to hand out the pre-allocated objects first.
145 2) I want to be able to interrupt sleeping allocation with a signal.
146 Note: This is a single linked list, the next pointer is the private
147 member of struct page.
149 struct page *drbd_pp_pool;
150 spinlock_t drbd_pp_lock;
152 wait_queue_head_t drbd_pp_wait;
154 DEFINE_RATELIMIT_STATE(drbd_ratelimit_state, 5 * HZ, 5);
156 static const struct block_device_operations drbd_ops = {
157 .owner = THIS_MODULE,
159 .release = drbd_release,
162 #define ARRY_SIZE(A) (sizeof(A)/sizeof(A[0]))
165 /* When checking with sparse, and this is an inline function, sparse will
166 give tons of false positives. When this is a real functions sparse works.
168 int _get_ldev_if_state(struct drbd_conf *mdev, enum drbd_disk_state mins)
172 atomic_inc(&mdev->local_cnt);
173 io_allowed = (mdev->state.disk >= mins);
175 if (atomic_dec_and_test(&mdev->local_cnt))
176 wake_up(&mdev->misc_wait);
184 * DOC: The transfer log
186 * The transfer log is a single linked list of &struct drbd_tl_epoch objects.
187 * mdev->newest_tle points to the head, mdev->oldest_tle points to the tail
188 * of the list. There is always at least one &struct drbd_tl_epoch object.
190 * Each &struct drbd_tl_epoch has a circular double linked list of requests
193 static int tl_init(struct drbd_conf *mdev)
195 struct drbd_tl_epoch *b;
197 /* during device minor initialization, we may well use GFP_KERNEL */
198 b = kmalloc(sizeof(struct drbd_tl_epoch), GFP_KERNEL);
201 INIT_LIST_HEAD(&b->requests);
202 INIT_LIST_HEAD(&b->w.list);
206 b->w.cb = NULL; /* if this is != NULL, we need to dec_ap_pending in tl_clear */
208 mdev->oldest_tle = b;
209 mdev->newest_tle = b;
210 INIT_LIST_HEAD(&mdev->out_of_sequence_requests);
212 mdev->tl_hash = NULL;
218 static void tl_cleanup(struct drbd_conf *mdev)
220 D_ASSERT(mdev->oldest_tle == mdev->newest_tle);
221 D_ASSERT(list_empty(&mdev->out_of_sequence_requests));
222 kfree(mdev->oldest_tle);
223 mdev->oldest_tle = NULL;
224 kfree(mdev->unused_spare_tle);
225 mdev->unused_spare_tle = NULL;
226 kfree(mdev->tl_hash);
227 mdev->tl_hash = NULL;
232 * _tl_add_barrier() - Adds a barrier to the transfer log
233 * @mdev: DRBD device.
234 * @new: Barrier to be added before the current head of the TL.
236 * The caller must hold the req_lock.
238 void _tl_add_barrier(struct drbd_conf *mdev, struct drbd_tl_epoch *new)
240 struct drbd_tl_epoch *newest_before;
242 INIT_LIST_HEAD(&new->requests);
243 INIT_LIST_HEAD(&new->w.list);
244 new->w.cb = NULL; /* if this is != NULL, we need to dec_ap_pending in tl_clear */
248 newest_before = mdev->newest_tle;
249 /* never send a barrier number == 0, because that is special-cased
250 * when using TCQ for our write ordering code */
251 new->br_number = (newest_before->br_number+1) ?: 1;
252 if (mdev->newest_tle != new) {
253 mdev->newest_tle->next = new;
254 mdev->newest_tle = new;
259 * tl_release() - Free or recycle the oldest &struct drbd_tl_epoch object of the TL
260 * @mdev: DRBD device.
261 * @barrier_nr: Expected identifier of the DRBD write barrier packet.
262 * @set_size: Expected number of requests before that barrier.
264 * In case the passed barrier_nr or set_size does not match the oldest
265 * &struct drbd_tl_epoch objects this function will cause a termination
268 void tl_release(struct drbd_conf *mdev, unsigned int barrier_nr,
269 unsigned int set_size)
271 struct drbd_tl_epoch *b, *nob; /* next old barrier */
272 struct list_head *le, *tle;
273 struct drbd_request *r;
275 spin_lock_irq(&mdev->req_lock);
277 b = mdev->oldest_tle;
279 /* first some paranoia code */
281 dev_err(DEV, "BAD! BarrierAck #%u received, but no epoch in tl!?\n",
285 if (b->br_number != barrier_nr) {
286 dev_err(DEV, "BAD! BarrierAck #%u received, expected #%u!\n",
287 barrier_nr, b->br_number);
290 if (b->n_writes != set_size) {
291 dev_err(DEV, "BAD! BarrierAck #%u received with n_writes=%u, expected n_writes=%u!\n",
292 barrier_nr, set_size, b->n_writes);
296 /* Clean up list of requests processed during current epoch */
297 list_for_each_safe(le, tle, &b->requests) {
298 r = list_entry(le, struct drbd_request, tl_requests);
299 _req_mod(r, barrier_acked);
301 /* There could be requests on the list waiting for completion
302 of the write to the local disk. To avoid corruptions of
303 slab's data structures we have to remove the lists head.
305 Also there could have been a barrier ack out of sequence, overtaking
306 the write acks - which would be a bug and violating write ordering.
307 To not deadlock in case we lose connection while such requests are
308 still pending, we need some way to find them for the
309 _req_mode(connection_lost_while_pending).
311 These have been list_move'd to the out_of_sequence_requests list in
312 _req_mod(, barrier_acked) above.
314 list_del_init(&b->requests);
317 if (test_and_clear_bit(CREATE_BARRIER, &mdev->flags)) {
318 _tl_add_barrier(mdev, b);
320 mdev->oldest_tle = nob;
321 /* if nob == NULL b was the only barrier, and becomes the new
322 barrier. Therefore mdev->oldest_tle points already to b */
324 D_ASSERT(nob != NULL);
325 mdev->oldest_tle = nob;
329 spin_unlock_irq(&mdev->req_lock);
330 dec_ap_pending(mdev);
335 spin_unlock_irq(&mdev->req_lock);
336 drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR));
340 /* In C_AHEAD mode only out_of_sync packets are sent for requests. Detach
341 * those requests from the newsest barrier when changing to an other cstate.
343 * That headless list vanishes when the last request finished its write or
344 * send out_of_sync packet. */
345 static void tl_forget(struct drbd_conf *mdev)
347 struct drbd_tl_epoch *b;
349 if (test_bit(CREATE_BARRIER, &mdev->flags))
352 b = mdev->newest_tle;
353 list_del(&b->requests);
354 _tl_add_barrier(mdev, b);
358 * _tl_restart() - Walks the transfer log, and applies an action to all requests
359 * @mdev: DRBD device.
360 * @what: The action/event to perform with all request objects
362 * @what might be one of connection_lost_while_pending, resend, fail_frozen_disk_io,
363 * restart_frozen_disk_io.
365 static void _tl_restart(struct drbd_conf *mdev, enum drbd_req_event what)
367 struct drbd_tl_epoch *b, *tmp, **pn;
368 struct list_head *le, *tle, carry_reads;
369 struct drbd_request *req;
370 int rv, n_writes, n_reads;
372 b = mdev->oldest_tle;
373 pn = &mdev->oldest_tle;
377 INIT_LIST_HEAD(&carry_reads);
378 list_for_each_safe(le, tle, &b->requests) {
379 req = list_entry(le, struct drbd_request, tl_requests);
380 rv = _req_mod(req, what);
382 n_writes += (rv & MR_WRITE) >> MR_WRITE_SHIFT;
383 n_reads += (rv & MR_READ) >> MR_READ_SHIFT;
388 if (what == resend) {
389 b->n_writes = n_writes;
390 if (b->w.cb == NULL) {
391 b->w.cb = w_send_barrier;
392 inc_ap_pending(mdev);
393 set_bit(CREATE_BARRIER, &mdev->flags);
396 drbd_queue_work(&mdev->data.work, &b->w);
401 list_add(&carry_reads, &b->requests);
402 /* there could still be requests on that ring list,
403 * in case local io is still pending */
404 list_del(&b->requests);
406 /* dec_ap_pending corresponding to queue_barrier.
407 * the newest barrier may not have been queued yet,
408 * in which case w.cb is still NULL. */
410 dec_ap_pending(mdev);
412 if (b == mdev->newest_tle) {
413 /* recycle, but reinit! */
414 D_ASSERT(tmp == NULL);
415 INIT_LIST_HEAD(&b->requests);
416 list_splice(&carry_reads, &b->requests);
417 INIT_LIST_HEAD(&b->w.list);
419 b->br_number = net_random();
429 list_splice(&carry_reads, &b->requests);
435 * tl_clear() - Clears all requests and &struct drbd_tl_epoch objects out of the TL
436 * @mdev: DRBD device.
438 * This is called after the connection to the peer was lost. The storage covered
439 * by the requests on the transfer gets marked as our of sync. Called from the
440 * receiver thread and the worker thread.
442 void tl_clear(struct drbd_conf *mdev)
444 struct list_head *le, *tle;
445 struct drbd_request *r;
447 spin_lock_irq(&mdev->req_lock);
449 _tl_restart(mdev, connection_lost_while_pending);
451 /* we expect this list to be empty. */
452 D_ASSERT(list_empty(&mdev->out_of_sequence_requests));
454 /* but just in case, clean it up anyways! */
455 list_for_each_safe(le, tle, &mdev->out_of_sequence_requests) {
456 r = list_entry(le, struct drbd_request, tl_requests);
457 /* It would be nice to complete outside of spinlock.
458 * But this is easier for now. */
459 _req_mod(r, connection_lost_while_pending);
462 /* ensure bit indicating barrier is required is clear */
463 clear_bit(CREATE_BARRIER, &mdev->flags);
465 memset(mdev->app_reads_hash, 0, APP_R_HSIZE*sizeof(void *));
467 spin_unlock_irq(&mdev->req_lock);
470 void tl_restart(struct drbd_conf *mdev, enum drbd_req_event what)
472 spin_lock_irq(&mdev->req_lock);
473 _tl_restart(mdev, what);
474 spin_unlock_irq(&mdev->req_lock);
478 * cl_wide_st_chg() - true if the state change is a cluster wide one
479 * @mdev: DRBD device.
480 * @os: old (current) state.
481 * @ns: new (wanted) state.
483 static int cl_wide_st_chg(struct drbd_conf *mdev,
484 union drbd_state os, union drbd_state ns)
486 return (os.conn >= C_CONNECTED && ns.conn >= C_CONNECTED &&
487 ((os.role != R_PRIMARY && ns.role == R_PRIMARY) ||
488 (os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) ||
489 (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S) ||
490 (os.disk != D_DISKLESS && ns.disk == D_DISKLESS))) ||
491 (os.conn >= C_CONNECTED && ns.conn == C_DISCONNECTING) ||
492 (os.conn == C_CONNECTED && ns.conn == C_VERIFY_S);
496 drbd_change_state(struct drbd_conf *mdev, enum chg_state_flags f,
497 union drbd_state mask, union drbd_state val)
500 union drbd_state os, ns;
501 enum drbd_state_rv rv;
503 spin_lock_irqsave(&mdev->req_lock, flags);
505 ns.i = (os.i & ~mask.i) | val.i;
506 rv = _drbd_set_state(mdev, ns, f, NULL);
508 spin_unlock_irqrestore(&mdev->req_lock, flags);
514 * drbd_force_state() - Impose a change which happens outside our control on our state
515 * @mdev: DRBD device.
516 * @mask: mask of state bits to change.
517 * @val: value of new state bits.
519 void drbd_force_state(struct drbd_conf *mdev,
520 union drbd_state mask, union drbd_state val)
522 drbd_change_state(mdev, CS_HARD, mask, val);
525 static enum drbd_state_rv is_valid_state(struct drbd_conf *, union drbd_state);
526 static enum drbd_state_rv is_valid_state_transition(struct drbd_conf *,
529 static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state os,
530 union drbd_state ns, const char **warn_sync_abort);
531 int drbd_send_state_req(struct drbd_conf *,
532 union drbd_state, union drbd_state);
534 static enum drbd_state_rv
535 _req_st_cond(struct drbd_conf *mdev, union drbd_state mask,
536 union drbd_state val)
538 union drbd_state os, ns;
540 enum drbd_state_rv rv;
542 if (test_and_clear_bit(CL_ST_CHG_SUCCESS, &mdev->flags))
543 return SS_CW_SUCCESS;
545 if (test_and_clear_bit(CL_ST_CHG_FAIL, &mdev->flags))
546 return SS_CW_FAILED_BY_PEER;
549 spin_lock_irqsave(&mdev->req_lock, flags);
551 ns.i = (os.i & ~mask.i) | val.i;
552 ns = sanitize_state(mdev, os, ns, NULL);
554 if (!cl_wide_st_chg(mdev, os, ns))
557 rv = is_valid_state(mdev, ns);
558 if (rv == SS_SUCCESS) {
559 rv = is_valid_state_transition(mdev, ns, os);
560 if (rv == SS_SUCCESS)
561 rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */
564 spin_unlock_irqrestore(&mdev->req_lock, flags);
570 * drbd_req_state() - Perform an eventually cluster wide state change
571 * @mdev: DRBD device.
572 * @mask: mask of state bits to change.
573 * @val: value of new state bits.
576 * Should not be called directly, use drbd_request_state() or
577 * _drbd_request_state().
579 static enum drbd_state_rv
580 drbd_req_state(struct drbd_conf *mdev, union drbd_state mask,
581 union drbd_state val, enum chg_state_flags f)
583 struct completion done;
585 union drbd_state os, ns;
586 enum drbd_state_rv rv;
588 init_completion(&done);
590 if (f & CS_SERIALIZE)
591 mutex_lock(&mdev->state_mutex);
593 spin_lock_irqsave(&mdev->req_lock, flags);
595 ns.i = (os.i & ~mask.i) | val.i;
596 ns = sanitize_state(mdev, os, ns, NULL);
598 if (cl_wide_st_chg(mdev, os, ns)) {
599 rv = is_valid_state(mdev, ns);
600 if (rv == SS_SUCCESS)
601 rv = is_valid_state_transition(mdev, ns, os);
602 spin_unlock_irqrestore(&mdev->req_lock, flags);
604 if (rv < SS_SUCCESS) {
606 print_st_err(mdev, os, ns, rv);
610 drbd_state_lock(mdev);
611 if (!drbd_send_state_req(mdev, mask, val)) {
612 drbd_state_unlock(mdev);
613 rv = SS_CW_FAILED_BY_PEER;
615 print_st_err(mdev, os, ns, rv);
619 wait_event(mdev->state_wait,
620 (rv = _req_st_cond(mdev, mask, val)));
622 if (rv < SS_SUCCESS) {
623 drbd_state_unlock(mdev);
625 print_st_err(mdev, os, ns, rv);
628 spin_lock_irqsave(&mdev->req_lock, flags);
630 ns.i = (os.i & ~mask.i) | val.i;
631 rv = _drbd_set_state(mdev, ns, f, &done);
632 drbd_state_unlock(mdev);
634 rv = _drbd_set_state(mdev, ns, f, &done);
637 spin_unlock_irqrestore(&mdev->req_lock, flags);
639 if (f & CS_WAIT_COMPLETE && rv == SS_SUCCESS) {
640 D_ASSERT(current != mdev->worker.task);
641 wait_for_completion(&done);
645 if (f & CS_SERIALIZE)
646 mutex_unlock(&mdev->state_mutex);
652 * _drbd_request_state() - Request a state change (with flags)
653 * @mdev: DRBD device.
654 * @mask: mask of state bits to change.
655 * @val: value of new state bits.
658 * Cousin of drbd_request_state(), useful with the CS_WAIT_COMPLETE
659 * flag, or when logging of failed state change requests is not desired.
662 _drbd_request_state(struct drbd_conf *mdev, union drbd_state mask,
663 union drbd_state val, enum chg_state_flags f)
665 enum drbd_state_rv rv;
667 wait_event(mdev->state_wait,
668 (rv = drbd_req_state(mdev, mask, val, f)) != SS_IN_TRANSIENT_STATE);
673 static void print_st(struct drbd_conf *mdev, char *name, union drbd_state ns)
675 dev_err(DEV, " %s = { cs:%s ro:%s/%s ds:%s/%s %c%c%c%c }\n",
677 drbd_conn_str(ns.conn),
678 drbd_role_str(ns.role),
679 drbd_role_str(ns.peer),
680 drbd_disk_str(ns.disk),
681 drbd_disk_str(ns.pdsk),
682 is_susp(ns) ? 's' : 'r',
683 ns.aftr_isp ? 'a' : '-',
684 ns.peer_isp ? 'p' : '-',
685 ns.user_isp ? 'u' : '-'
689 void print_st_err(struct drbd_conf *mdev, union drbd_state os,
690 union drbd_state ns, enum drbd_state_rv err)
692 if (err == SS_IN_TRANSIENT_STATE)
694 dev_err(DEV, "State change failed: %s\n", drbd_set_st_err_str(err));
695 print_st(mdev, " state", os);
696 print_st(mdev, "wanted", ns);
701 * is_valid_state() - Returns an SS_ error code if ns is not valid
702 * @mdev: DRBD device.
703 * @ns: State to consider.
705 static enum drbd_state_rv
706 is_valid_state(struct drbd_conf *mdev, union drbd_state ns)
708 /* See drbd_state_sw_errors in drbd_strings.c */
710 enum drbd_fencing_p fp;
711 enum drbd_state_rv rv = SS_SUCCESS;
714 if (get_ldev(mdev)) {
715 fp = mdev->ldev->dc.fencing;
719 if (get_net_conf(mdev)) {
720 if (!mdev->net_conf->two_primaries &&
721 ns.role == R_PRIMARY && ns.peer == R_PRIMARY)
722 rv = SS_TWO_PRIMARIES;
727 /* already found a reason to abort */;
728 else if (ns.role == R_SECONDARY && mdev->open_cnt)
729 rv = SS_DEVICE_IN_USE;
731 else if (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.disk < D_UP_TO_DATE)
732 rv = SS_NO_UP_TO_DATE_DISK;
734 else if (fp >= FP_RESOURCE &&
735 ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk >= D_UNKNOWN)
738 else if (ns.role == R_PRIMARY && ns.disk <= D_INCONSISTENT && ns.pdsk <= D_INCONSISTENT)
739 rv = SS_NO_UP_TO_DATE_DISK;
741 else if (ns.conn > C_CONNECTED && ns.disk < D_INCONSISTENT)
742 rv = SS_NO_LOCAL_DISK;
744 else if (ns.conn > C_CONNECTED && ns.pdsk < D_INCONSISTENT)
745 rv = SS_NO_REMOTE_DISK;
747 else if (ns.conn > C_CONNECTED && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE)
748 rv = SS_NO_UP_TO_DATE_DISK;
750 else if ((ns.conn == C_CONNECTED ||
751 ns.conn == C_WF_BITMAP_S ||
752 ns.conn == C_SYNC_SOURCE ||
753 ns.conn == C_PAUSED_SYNC_S) &&
754 ns.disk == D_OUTDATED)
755 rv = SS_CONNECTED_OUTDATES;
757 else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
758 (mdev->sync_conf.verify_alg[0] == 0))
759 rv = SS_NO_VERIFY_ALG;
761 else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
762 mdev->agreed_pro_version < 88)
763 rv = SS_NOT_SUPPORTED;
769 * is_valid_state_transition() - Returns an SS_ error code if the state transition is not possible
770 * @mdev: DRBD device.
774 static enum drbd_state_rv
775 is_valid_state_transition(struct drbd_conf *mdev, union drbd_state ns,
778 enum drbd_state_rv rv = SS_SUCCESS;
780 if ((ns.conn == C_STARTING_SYNC_T || ns.conn == C_STARTING_SYNC_S) &&
781 os.conn > C_CONNECTED)
782 rv = SS_RESYNC_RUNNING;
784 if (ns.conn == C_DISCONNECTING && os.conn == C_STANDALONE)
785 rv = SS_ALREADY_STANDALONE;
787 if (ns.disk > D_ATTACHING && os.disk == D_DISKLESS)
790 if (ns.conn == C_WF_CONNECTION && os.conn < C_UNCONNECTED)
791 rv = SS_NO_NET_CONFIG;
793 if (ns.disk == D_OUTDATED && os.disk < D_OUTDATED && os.disk != D_ATTACHING)
794 rv = SS_LOWER_THAN_OUTDATED;
796 if (ns.conn == C_DISCONNECTING && os.conn == C_UNCONNECTED)
797 rv = SS_IN_TRANSIENT_STATE;
799 if (ns.conn == os.conn && ns.conn == C_WF_REPORT_PARAMS)
800 rv = SS_IN_TRANSIENT_STATE;
802 if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && os.conn < C_CONNECTED)
803 rv = SS_NEED_CONNECTION;
805 if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
806 ns.conn != os.conn && os.conn > C_CONNECTED)
807 rv = SS_RESYNC_RUNNING;
809 if ((ns.conn == C_STARTING_SYNC_S || ns.conn == C_STARTING_SYNC_T) &&
810 os.conn < C_CONNECTED)
811 rv = SS_NEED_CONNECTION;
813 if ((ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)
814 && os.conn < C_WF_REPORT_PARAMS)
815 rv = SS_NEED_CONNECTION; /* No NetworkFailure -> SyncTarget etc... */
821 * sanitize_state() - Resolves implicitly necessary additional changes to a state transition
822 * @mdev: DRBD device.
827 * When we loose connection, we have to set the state of the peers disk (pdsk)
828 * to D_UNKNOWN. This rule and many more along those lines are in this function.
830 static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state os,
831 union drbd_state ns, const char **warn_sync_abort)
833 enum drbd_fencing_p fp;
834 enum drbd_disk_state disk_min, disk_max, pdsk_min, pdsk_max;
837 if (get_ldev(mdev)) {
838 fp = mdev->ldev->dc.fencing;
842 /* Disallow Network errors to configure a device's network part */
843 if ((ns.conn >= C_TIMEOUT && ns.conn <= C_TEAR_DOWN) &&
844 os.conn <= C_DISCONNECTING)
847 /* After a network error (+C_TEAR_DOWN) only C_UNCONNECTED or C_DISCONNECTING can follow.
848 * If you try to go into some Sync* state, that shall fail (elsewhere). */
849 if (os.conn >= C_TIMEOUT && os.conn <= C_TEAR_DOWN &&
850 ns.conn != C_UNCONNECTED && ns.conn != C_DISCONNECTING && ns.conn <= C_TEAR_DOWN)
853 /* we cannot fail (again) if we already detached */
854 if (ns.disk == D_FAILED && os.disk == D_DISKLESS)
855 ns.disk = D_DISKLESS;
857 /* if we are only D_ATTACHING yet,
858 * we can (and should) go directly to D_DISKLESS. */
859 if (ns.disk == D_FAILED && os.disk == D_ATTACHING)
860 ns.disk = D_DISKLESS;
862 /* After C_DISCONNECTING only C_STANDALONE may follow */
863 if (os.conn == C_DISCONNECTING && ns.conn != C_STANDALONE)
866 if (ns.conn < C_CONNECTED) {
869 if (ns.pdsk > D_UNKNOWN || ns.pdsk < D_INCONSISTENT)
873 /* Clear the aftr_isp when becoming unconfigured */
874 if (ns.conn == C_STANDALONE && ns.disk == D_DISKLESS && ns.role == R_SECONDARY)
877 /* Abort resync if a disk fails/detaches */
878 if (os.conn > C_CONNECTED && ns.conn > C_CONNECTED &&
879 (ns.disk <= D_FAILED || ns.pdsk <= D_FAILED)) {
882 os.conn == C_VERIFY_S || os.conn == C_VERIFY_T ?
883 "Online-verify" : "Resync";
884 ns.conn = C_CONNECTED;
887 /* Connection breaks down before we finished "Negotiating" */
888 if (ns.conn < C_CONNECTED && ns.disk == D_NEGOTIATING &&
889 get_ldev_if_state(mdev, D_NEGOTIATING)) {
890 if (mdev->ed_uuid == mdev->ldev->md.uuid[UI_CURRENT]) {
891 ns.disk = mdev->new_state_tmp.disk;
892 ns.pdsk = mdev->new_state_tmp.pdsk;
894 dev_alert(DEV, "Connection lost while negotiating, no data!\n");
895 ns.disk = D_DISKLESS;
901 /* D_CONSISTENT and D_OUTDATED vanish when we get connected */
902 if (ns.conn >= C_CONNECTED && ns.conn < C_AHEAD) {
903 if (ns.disk == D_CONSISTENT || ns.disk == D_OUTDATED)
904 ns.disk = D_UP_TO_DATE;
905 if (ns.pdsk == D_CONSISTENT || ns.pdsk == D_OUTDATED)
906 ns.pdsk = D_UP_TO_DATE;
909 /* Implications of the connection stat on the disk states */
910 disk_min = D_DISKLESS;
911 disk_max = D_UP_TO_DATE;
912 pdsk_min = D_INCONSISTENT;
913 pdsk_max = D_UNKNOWN;
914 switch ((enum drbd_conns)ns.conn) {
916 case C_PAUSED_SYNC_T:
917 case C_STARTING_SYNC_T:
920 disk_min = D_INCONSISTENT;
921 disk_max = D_OUTDATED;
922 pdsk_min = D_UP_TO_DATE;
923 pdsk_max = D_UP_TO_DATE;
927 disk_min = D_UP_TO_DATE;
928 disk_max = D_UP_TO_DATE;
929 pdsk_min = D_UP_TO_DATE;
930 pdsk_max = D_UP_TO_DATE;
933 disk_min = D_DISKLESS;
934 disk_max = D_UP_TO_DATE;
935 pdsk_min = D_DISKLESS;
936 pdsk_max = D_UP_TO_DATE;
939 case C_PAUSED_SYNC_S:
940 case C_STARTING_SYNC_S:
942 disk_min = D_UP_TO_DATE;
943 disk_max = D_UP_TO_DATE;
944 pdsk_min = D_INCONSISTENT;
945 pdsk_max = D_CONSISTENT; /* D_OUTDATED would be nice. But explicit outdate necessary*/
948 disk_min = D_INCONSISTENT;
949 disk_max = D_INCONSISTENT;
950 pdsk_min = D_UP_TO_DATE;
951 pdsk_max = D_UP_TO_DATE;
954 disk_min = D_UP_TO_DATE;
955 disk_max = D_UP_TO_DATE;
956 pdsk_min = D_INCONSISTENT;
957 pdsk_max = D_INCONSISTENT;
960 case C_DISCONNECTING:
964 case C_NETWORK_FAILURE:
965 case C_PROTOCOL_ERROR:
967 case C_WF_CONNECTION:
968 case C_WF_REPORT_PARAMS:
972 if (ns.disk > disk_max)
975 if (ns.disk < disk_min) {
976 dev_warn(DEV, "Implicitly set disk from %s to %s\n",
977 drbd_disk_str(ns.disk), drbd_disk_str(disk_min));
980 if (ns.pdsk > pdsk_max)
983 if (ns.pdsk < pdsk_min) {
984 dev_warn(DEV, "Implicitly set pdsk from %s to %s\n",
985 drbd_disk_str(ns.pdsk), drbd_disk_str(pdsk_min));
989 if (fp == FP_STONITH &&
990 (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk > D_OUTDATED) &&
991 !(os.role == R_PRIMARY && os.conn < C_CONNECTED && os.pdsk > D_OUTDATED))
992 ns.susp_fen = 1; /* Suspend IO while fence-peer handler runs (peer lost) */
994 if (mdev->sync_conf.on_no_data == OND_SUSPEND_IO &&
995 (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE) &&
996 !(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE))
997 ns.susp_nod = 1; /* Suspend IO while no data available (no accessible data available) */
999 if (ns.aftr_isp || ns.peer_isp || ns.user_isp) {
1000 if (ns.conn == C_SYNC_SOURCE)
1001 ns.conn = C_PAUSED_SYNC_S;
1002 if (ns.conn == C_SYNC_TARGET)
1003 ns.conn = C_PAUSED_SYNC_T;
1005 if (ns.conn == C_PAUSED_SYNC_S)
1006 ns.conn = C_SYNC_SOURCE;
1007 if (ns.conn == C_PAUSED_SYNC_T)
1008 ns.conn = C_SYNC_TARGET;
1014 /* helper for __drbd_set_state */
1015 static void set_ov_position(struct drbd_conf *mdev, enum drbd_conns cs)
1017 if (mdev->agreed_pro_version < 90)
1018 mdev->ov_start_sector = 0;
1019 mdev->rs_total = drbd_bm_bits(mdev);
1020 mdev->ov_position = 0;
1021 if (cs == C_VERIFY_T) {
1022 /* starting online verify from an arbitrary position
1023 * does not fit well into the existing protocol.
1024 * on C_VERIFY_T, we initialize ov_left and friends
1025 * implicitly in receive_DataRequest once the
1026 * first P_OV_REQUEST is received */
1027 mdev->ov_start_sector = ~(sector_t)0;
1029 unsigned long bit = BM_SECT_TO_BIT(mdev->ov_start_sector);
1030 if (bit >= mdev->rs_total) {
1031 mdev->ov_start_sector =
1032 BM_BIT_TO_SECT(mdev->rs_total - 1);
1035 mdev->rs_total -= bit;
1036 mdev->ov_position = mdev->ov_start_sector;
1038 mdev->ov_left = mdev->rs_total;
1041 static void drbd_resume_al(struct drbd_conf *mdev)
1043 if (test_and_clear_bit(AL_SUSPENDED, &mdev->flags))
1044 dev_info(DEV, "Resumed AL updates\n");
1048 * __drbd_set_state() - Set a new DRBD state
1049 * @mdev: DRBD device.
1052 * @done: Optional completion, that will get completed after the after_state_ch() finished
1054 * Caller needs to hold req_lock, and global_state_lock. Do not call directly.
1057 __drbd_set_state(struct drbd_conf *mdev, union drbd_state ns,
1058 enum chg_state_flags flags, struct completion *done)
1060 union drbd_state os;
1061 enum drbd_state_rv rv = SS_SUCCESS;
1062 const char *warn_sync_abort = NULL;
1063 struct after_state_chg_work *ascw;
1067 ns = sanitize_state(mdev, os, ns, &warn_sync_abort);
1070 return SS_NOTHING_TO_DO;
1072 if (!(flags & CS_HARD)) {
1073 /* pre-state-change checks ; only look at ns */
1074 /* See drbd_state_sw_errors in drbd_strings.c */
1076 rv = is_valid_state(mdev, ns);
1077 if (rv < SS_SUCCESS) {
1078 /* If the old state was illegal as well, then let
1081 if (is_valid_state(mdev, os) == rv)
1082 rv = is_valid_state_transition(mdev, ns, os);
1084 rv = is_valid_state_transition(mdev, ns, os);
1087 if (rv < SS_SUCCESS) {
1088 if (flags & CS_VERBOSE)
1089 print_st_err(mdev, os, ns, rv);
1093 if (warn_sync_abort)
1094 dev_warn(DEV, "%s aborted.\n", warn_sync_abort);
1100 if (ns.role != os.role)
1101 pbp += sprintf(pbp, "role( %s -> %s ) ",
1102 drbd_role_str(os.role),
1103 drbd_role_str(ns.role));
1104 if (ns.peer != os.peer)
1105 pbp += sprintf(pbp, "peer( %s -> %s ) ",
1106 drbd_role_str(os.peer),
1107 drbd_role_str(ns.peer));
1108 if (ns.conn != os.conn)
1109 pbp += sprintf(pbp, "conn( %s -> %s ) ",
1110 drbd_conn_str(os.conn),
1111 drbd_conn_str(ns.conn));
1112 if (ns.disk != os.disk)
1113 pbp += sprintf(pbp, "disk( %s -> %s ) ",
1114 drbd_disk_str(os.disk),
1115 drbd_disk_str(ns.disk));
1116 if (ns.pdsk != os.pdsk)
1117 pbp += sprintf(pbp, "pdsk( %s -> %s ) ",
1118 drbd_disk_str(os.pdsk),
1119 drbd_disk_str(ns.pdsk));
1120 if (is_susp(ns) != is_susp(os))
1121 pbp += sprintf(pbp, "susp( %d -> %d ) ",
1124 if (ns.aftr_isp != os.aftr_isp)
1125 pbp += sprintf(pbp, "aftr_isp( %d -> %d ) ",
1128 if (ns.peer_isp != os.peer_isp)
1129 pbp += sprintf(pbp, "peer_isp( %d -> %d ) ",
1132 if (ns.user_isp != os.user_isp)
1133 pbp += sprintf(pbp, "user_isp( %d -> %d ) ",
1136 dev_info(DEV, "%s\n", pb);
1139 /* solve the race between becoming unconfigured,
1140 * worker doing the cleanup, and
1141 * admin reconfiguring us:
1142 * on (re)configure, first set CONFIG_PENDING,
1143 * then wait for a potentially exiting worker,
1144 * start the worker, and schedule one no_op.
1145 * then proceed with configuration.
1147 if (ns.disk == D_DISKLESS &&
1148 ns.conn == C_STANDALONE &&
1149 ns.role == R_SECONDARY &&
1150 !test_and_set_bit(CONFIG_PENDING, &mdev->flags))
1151 set_bit(DEVICE_DYING, &mdev->flags);
1153 /* if we are going -> D_FAILED or D_DISKLESS, grab one extra reference
1154 * on the ldev here, to be sure the transition -> D_DISKLESS resp.
1155 * drbd_ldev_destroy() won't happen before our corresponding
1156 * after_state_ch works run, where we put_ldev again. */
1157 if ((os.disk != D_FAILED && ns.disk == D_FAILED) ||
1158 (os.disk != D_DISKLESS && ns.disk == D_DISKLESS))
1159 atomic_inc(&mdev->local_cnt);
1162 wake_up(&mdev->misc_wait);
1163 wake_up(&mdev->state_wait);
1165 /* aborted verify run. log the last position */
1166 if ((os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) &&
1167 ns.conn < C_CONNECTED) {
1168 mdev->ov_start_sector =
1169 BM_BIT_TO_SECT(drbd_bm_bits(mdev) - mdev->ov_left);
1170 dev_info(DEV, "Online Verify reached sector %llu\n",
1171 (unsigned long long)mdev->ov_start_sector);
1174 if ((os.conn == C_PAUSED_SYNC_T || os.conn == C_PAUSED_SYNC_S) &&
1175 (ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)) {
1176 dev_info(DEV, "Syncer continues.\n");
1177 mdev->rs_paused += (long)jiffies
1178 -(long)mdev->rs_mark_time[mdev->rs_last_mark];
1179 if (ns.conn == C_SYNC_TARGET)
1180 mod_timer(&mdev->resync_timer, jiffies);
1183 if ((os.conn == C_SYNC_TARGET || os.conn == C_SYNC_SOURCE) &&
1184 (ns.conn == C_PAUSED_SYNC_T || ns.conn == C_PAUSED_SYNC_S)) {
1185 dev_info(DEV, "Resync suspended\n");
1186 mdev->rs_mark_time[mdev->rs_last_mark] = jiffies;
1189 if (os.conn == C_CONNECTED &&
1190 (ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T)) {
1191 unsigned long now = jiffies;
1194 set_ov_position(mdev, ns.conn);
1195 mdev->rs_start = now;
1196 mdev->rs_last_events = 0;
1197 mdev->rs_last_sect_ev = 0;
1198 mdev->ov_last_oos_size = 0;
1199 mdev->ov_last_oos_start = 0;
1201 for (i = 0; i < DRBD_SYNC_MARKS; i++) {
1202 mdev->rs_mark_left[i] = mdev->ov_left;
1203 mdev->rs_mark_time[i] = now;
1206 drbd_rs_controller_reset(mdev);
1208 if (ns.conn == C_VERIFY_S) {
1209 dev_info(DEV, "Starting Online Verify from sector %llu\n",
1210 (unsigned long long)mdev->ov_position);
1211 mod_timer(&mdev->resync_timer, jiffies);
1215 if (get_ldev(mdev)) {
1216 u32 mdf = mdev->ldev->md.flags & ~(MDF_CONSISTENT|MDF_PRIMARY_IND|
1217 MDF_CONNECTED_IND|MDF_WAS_UP_TO_DATE|
1218 MDF_PEER_OUT_DATED|MDF_CRASHED_PRIMARY);
1220 if (test_bit(CRASHED_PRIMARY, &mdev->flags))
1221 mdf |= MDF_CRASHED_PRIMARY;
1222 if (mdev->state.role == R_PRIMARY ||
1223 (mdev->state.pdsk < D_INCONSISTENT && mdev->state.peer == R_PRIMARY))
1224 mdf |= MDF_PRIMARY_IND;
1225 if (mdev->state.conn > C_WF_REPORT_PARAMS)
1226 mdf |= MDF_CONNECTED_IND;
1227 if (mdev->state.disk > D_INCONSISTENT)
1228 mdf |= MDF_CONSISTENT;
1229 if (mdev->state.disk > D_OUTDATED)
1230 mdf |= MDF_WAS_UP_TO_DATE;
1231 if (mdev->state.pdsk <= D_OUTDATED && mdev->state.pdsk >= D_INCONSISTENT)
1232 mdf |= MDF_PEER_OUT_DATED;
1233 if (mdf != mdev->ldev->md.flags) {
1234 mdev->ldev->md.flags = mdf;
1235 drbd_md_mark_dirty(mdev);
1237 if (os.disk < D_CONSISTENT && ns.disk >= D_CONSISTENT)
1238 drbd_set_ed_uuid(mdev, mdev->ldev->md.uuid[UI_CURRENT]);
1242 /* Peer was forced D_UP_TO_DATE & R_PRIMARY, consider to resync */
1243 if (os.disk == D_INCONSISTENT && os.pdsk == D_INCONSISTENT &&
1244 os.peer == R_SECONDARY && ns.peer == R_PRIMARY)
1245 set_bit(CONSIDER_RESYNC, &mdev->flags);
1247 /* Receiver should clean up itself */
1248 if (os.conn != C_DISCONNECTING && ns.conn == C_DISCONNECTING)
1249 drbd_thread_stop_nowait(&mdev->receiver);
1251 /* Now the receiver finished cleaning up itself, it should die */
1252 if (os.conn != C_STANDALONE && ns.conn == C_STANDALONE)
1253 drbd_thread_stop_nowait(&mdev->receiver);
1255 /* Upon network failure, we need to restart the receiver. */
1256 if (os.conn > C_TEAR_DOWN &&
1257 ns.conn <= C_TEAR_DOWN && ns.conn >= C_TIMEOUT)
1258 drbd_thread_restart_nowait(&mdev->receiver);
1260 /* Resume AL writing if we get a connection */
1261 if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED)
1262 drbd_resume_al(mdev);
1264 /* Start a new epoch in case we start to mirror write requests */
1265 if (!drbd_should_do_remote(os) && drbd_should_do_remote(ns))
1268 /* Do not add local-only requests to an epoch with mirrored requests */
1269 if (drbd_should_do_remote(os) && !drbd_should_do_remote(ns))
1270 set_bit(CREATE_BARRIER, &mdev->flags);
1272 ascw = kmalloc(sizeof(*ascw), GFP_ATOMIC);
1276 ascw->flags = flags;
1277 ascw->w.cb = w_after_state_ch;
1279 drbd_queue_work(&mdev->data.work, &ascw->w);
1281 dev_warn(DEV, "Could not kmalloc an ascw\n");
1287 static int w_after_state_ch(struct drbd_conf *mdev, struct drbd_work *w, int unused)
1289 struct after_state_chg_work *ascw =
1290 container_of(w, struct after_state_chg_work, w);
1291 after_state_ch(mdev, ascw->os, ascw->ns, ascw->flags);
1292 if (ascw->flags & CS_WAIT_COMPLETE) {
1293 D_ASSERT(ascw->done != NULL);
1294 complete(ascw->done);
1301 static void abw_start_sync(struct drbd_conf *mdev, int rv)
1304 dev_err(DEV, "Writing the bitmap failed not starting resync.\n");
1305 _drbd_request_state(mdev, NS(conn, C_CONNECTED), CS_VERBOSE);
1309 switch (mdev->state.conn) {
1310 case C_STARTING_SYNC_T:
1311 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE);
1313 case C_STARTING_SYNC_S:
1314 drbd_start_resync(mdev, C_SYNC_SOURCE);
1319 int drbd_bitmap_io_from_worker(struct drbd_conf *mdev, int (*io_fn)(struct drbd_conf *), char *why)
1323 D_ASSERT(current == mdev->worker.task);
1325 /* open coded non-blocking drbd_suspend_io(mdev); */
1326 set_bit(SUSPEND_IO, &mdev->flags);
1327 if (!is_susp(mdev->state))
1328 D_ASSERT(atomic_read(&mdev->ap_bio_cnt) == 0);
1330 drbd_bm_lock(mdev, why);
1332 drbd_bm_unlock(mdev);
1334 drbd_resume_io(mdev);
1340 * after_state_ch() - Perform after state change actions that may sleep
1341 * @mdev: DRBD device.
1346 static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
1347 union drbd_state ns, enum chg_state_flags flags)
1349 enum drbd_fencing_p fp;
1350 enum drbd_req_event what = nothing;
1351 union drbd_state nsm = (union drbd_state){ .i = -1 };
1353 if (os.conn != C_CONNECTED && ns.conn == C_CONNECTED) {
1354 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1356 mdev->p_uuid[UI_FLAGS] &= ~((u64)2);
1360 if (get_ldev(mdev)) {
1361 fp = mdev->ldev->dc.fencing;
1365 /* Inform userspace about the change... */
1366 drbd_bcast_state(mdev, ns);
1368 if (!(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE) &&
1369 (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE))
1370 drbd_khelper(mdev, "pri-on-incon-degr");
1372 /* Here we have the actions that are performed after a
1373 state change. This function might sleep */
1377 if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED)
1380 if (os.disk == D_ATTACHING && ns.disk > D_ATTACHING)
1381 what = restart_frozen_disk_io;
1383 if (what != nothing)
1388 /* case1: The outdate peer handler is successful: */
1389 if (os.pdsk > D_OUTDATED && ns.pdsk <= D_OUTDATED) {
1391 if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
1392 drbd_uuid_new_current(mdev);
1393 clear_bit(NEW_CUR_UUID, &mdev->flags);
1395 spin_lock_irq(&mdev->req_lock);
1396 _drbd_set_state(_NS(mdev, susp_fen, 0), CS_VERBOSE, NULL);
1397 spin_unlock_irq(&mdev->req_lock);
1399 /* case2: The connection was established again: */
1400 if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) {
1401 clear_bit(NEW_CUR_UUID, &mdev->flags);
1407 if (what != nothing) {
1408 spin_lock_irq(&mdev->req_lock);
1409 _tl_restart(mdev, what);
1410 nsm.i &= mdev->state.i;
1411 _drbd_set_state(mdev, nsm, CS_VERBOSE, NULL);
1412 spin_unlock_irq(&mdev->req_lock);
1415 /* Became sync source. With protocol >= 96, we still need to send out
1416 * the sync uuid now. Need to do that before any drbd_send_state, or
1417 * the other side may go "paused sync" before receiving the sync uuids,
1418 * which is unexpected. */
1419 if ((os.conn != C_SYNC_SOURCE && os.conn != C_PAUSED_SYNC_S) &&
1420 (ns.conn == C_SYNC_SOURCE || ns.conn == C_PAUSED_SYNC_S) &&
1421 mdev->agreed_pro_version >= 96 && get_ldev(mdev)) {
1422 drbd_gen_and_send_sync_uuid(mdev);
1426 /* Do not change the order of the if above and the two below... */
1427 if (os.pdsk == D_DISKLESS && ns.pdsk > D_DISKLESS) { /* attach on the peer */
1428 drbd_send_uuids(mdev);
1429 drbd_send_state(mdev);
1431 /* No point in queuing send_bitmap if we don't have a connection
1432 * anymore, so check also the _current_ state, not only the new state
1433 * at the time this work was queued. */
1434 if (os.conn != C_WF_BITMAP_S && ns.conn == C_WF_BITMAP_S &&
1435 mdev->state.conn == C_WF_BITMAP_S)
1436 drbd_queue_bitmap_io(mdev, &drbd_send_bitmap, NULL,
1437 "send_bitmap (WFBitMapS)");
1439 /* Lost contact to peer's copy of the data */
1440 if ((os.pdsk >= D_INCONSISTENT &&
1441 os.pdsk != D_UNKNOWN &&
1442 os.pdsk != D_OUTDATED)
1443 && (ns.pdsk < D_INCONSISTENT ||
1444 ns.pdsk == D_UNKNOWN ||
1445 ns.pdsk == D_OUTDATED)) {
1446 if (get_ldev(mdev)) {
1447 if ((ns.role == R_PRIMARY || ns.peer == R_PRIMARY) &&
1448 mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) {
1449 if (is_susp(mdev->state)) {
1450 set_bit(NEW_CUR_UUID, &mdev->flags);
1452 drbd_uuid_new_current(mdev);
1453 drbd_send_uuids(mdev);
1460 if (ns.pdsk < D_INCONSISTENT && get_ldev(mdev)) {
1461 if (ns.peer == R_PRIMARY && mdev->ldev->md.uuid[UI_BITMAP] == 0) {
1462 drbd_uuid_new_current(mdev);
1463 drbd_send_uuids(mdev);
1466 /* D_DISKLESS Peer becomes secondary */
1467 if (os.peer == R_PRIMARY && ns.peer == R_SECONDARY)
1468 drbd_bitmap_io_from_worker(mdev, &drbd_bm_write, "demote diskless peer");
1472 /* Write out all changed bits on demote.
1473 * Though, no need to da that just yet
1474 * if there is a resync going on still */
1475 if (os.role == R_PRIMARY && ns.role == R_SECONDARY &&
1476 mdev->state.conn <= C_CONNECTED && get_ldev(mdev)) {
1477 drbd_bitmap_io_from_worker(mdev, &drbd_bm_write, "demote");
1481 /* Last part of the attaching process ... */
1482 if (ns.conn >= C_CONNECTED &&
1483 os.disk == D_ATTACHING && ns.disk == D_NEGOTIATING) {
1484 drbd_send_sizes(mdev, 0, 0); /* to start sync... */
1485 drbd_send_uuids(mdev);
1486 drbd_send_state(mdev);
1489 /* We want to pause/continue resync, tell peer. */
1490 if (ns.conn >= C_CONNECTED &&
1491 ((os.aftr_isp != ns.aftr_isp) ||
1492 (os.user_isp != ns.user_isp)))
1493 drbd_send_state(mdev);
1495 /* In case one of the isp bits got set, suspend other devices. */
1496 if ((!os.aftr_isp && !os.peer_isp && !os.user_isp) &&
1497 (ns.aftr_isp || ns.peer_isp || ns.user_isp))
1498 suspend_other_sg(mdev);
1500 /* Make sure the peer gets informed about eventual state
1501 changes (ISP bits) while we were in WFReportParams. */
1502 if (os.conn == C_WF_REPORT_PARAMS && ns.conn >= C_CONNECTED)
1503 drbd_send_state(mdev);
1505 if (os.conn != C_AHEAD && ns.conn == C_AHEAD)
1506 drbd_send_state(mdev);
1508 /* We are in the progress to start a full sync... */
1509 if ((os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) ||
1510 (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S))
1511 drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, &abw_start_sync, "set_n_write from StartingSync");
1513 /* We are invalidating our self... */
1514 if (os.conn < C_CONNECTED && ns.conn < C_CONNECTED &&
1515 os.disk > D_INCONSISTENT && ns.disk == D_INCONSISTENT)
1516 drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, NULL, "set_n_write from invalidate");
1518 /* first half of local IO error, failure to attach,
1519 * or administrative detach */
1520 if (os.disk != D_FAILED && ns.disk == D_FAILED) {
1521 enum drbd_io_error_p eh;
1523 /* corresponding get_ldev was in __drbd_set_state, to serialize
1524 * our cleanup here with the transition to D_DISKLESS,
1525 * so it is safe to dreference ldev here. */
1526 eh = mdev->ldev->dc.on_io_error;
1527 was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags);
1529 /* current state still has to be D_FAILED,
1530 * there is only one way out: to D_DISKLESS,
1531 * and that may only happen after our put_ldev below. */
1532 if (mdev->state.disk != D_FAILED)
1534 "ASSERT FAILED: disk is %s during detach\n",
1535 drbd_disk_str(mdev->state.disk));
1537 if (drbd_send_state(mdev))
1538 dev_warn(DEV, "Notified peer that I am detaching my disk\n");
1540 dev_err(DEV, "Sending state for detaching disk failed\n");
1542 drbd_rs_cancel_all(mdev);
1544 /* In case we want to get something to stable storage still,
1545 * this may be the last chance.
1546 * Following put_ldev may transition to D_DISKLESS. */
1550 if (was_io_error && eh == EP_CALL_HELPER)
1551 drbd_khelper(mdev, "local-io-error");
1554 /* second half of local IO error, failure to attach,
1555 * or administrative detach,
1556 * after local_cnt references have reached zero again */
1557 if (os.disk != D_DISKLESS && ns.disk == D_DISKLESS) {
1558 /* We must still be diskless,
1559 * re-attach has to be serialized with this! */
1560 if (mdev->state.disk != D_DISKLESS)
1562 "ASSERT FAILED: disk is %s while going diskless\n",
1563 drbd_disk_str(mdev->state.disk));
1566 mdev->rs_failed = 0;
1567 atomic_set(&mdev->rs_pending_cnt, 0);
1569 if (drbd_send_state(mdev))
1570 dev_warn(DEV, "Notified peer that I'm now diskless.\n");
1572 dev_err(DEV, "Sending state for being diskless failed\n");
1573 /* corresponding get_ldev in __drbd_set_state
1574 * this may finaly trigger drbd_ldev_destroy. */
1578 /* Disks got bigger while they were detached */
1579 if (ns.disk > D_NEGOTIATING && ns.pdsk > D_NEGOTIATING &&
1580 test_and_clear_bit(RESYNC_AFTER_NEG, &mdev->flags)) {
1581 if (ns.conn == C_CONNECTED)
1582 resync_after_online_grow(mdev);
1585 /* A resync finished or aborted, wake paused devices... */
1586 if ((os.conn > C_CONNECTED && ns.conn <= C_CONNECTED) ||
1587 (os.peer_isp && !ns.peer_isp) ||
1588 (os.user_isp && !ns.user_isp))
1589 resume_next_sg(mdev);
1591 /* sync target done with resync. Explicitly notify peer, even though
1592 * it should (at least for non-empty resyncs) already know itself. */
1593 if (os.disk < D_UP_TO_DATE && os.conn >= C_SYNC_SOURCE && ns.conn == C_CONNECTED)
1594 drbd_send_state(mdev);
1596 /* This triggers bitmap writeout of potentially still unwritten pages
1597 * if the resync finished cleanly, or aborted because of peer disk
1598 * failure. Resync aborted because of connection failure does bitmap
1599 * writeout from drbd_disconnect.
1600 * For resync aborted because of local disk failure, we cannot do
1601 * any bitmap writeout anymore.
1603 if (os.conn > C_CONNECTED && ns.conn == C_CONNECTED &&
1604 mdev->state.conn == C_CONNECTED && get_ldev(mdev)) {
1605 drbd_queue_bitmap_io(mdev, &drbd_bm_write, NULL, "write from resync_finished");
1609 /* free tl_hash if we Got thawed and are C_STANDALONE */
1610 if (ns.conn == C_STANDALONE && !is_susp(ns) && mdev->tl_hash)
1611 drbd_free_tl_hash(mdev);
1613 /* Upon network connection, we need to start the receiver */
1614 if (os.conn == C_STANDALONE && ns.conn == C_UNCONNECTED)
1615 drbd_thread_start(&mdev->receiver);
1617 /* Terminate worker thread if we are unconfigured - it will be
1618 restarted as needed... */
1619 if (ns.disk == D_DISKLESS &&
1620 ns.conn == C_STANDALONE &&
1621 ns.role == R_SECONDARY) {
1622 if (os.aftr_isp != ns.aftr_isp)
1623 resume_next_sg(mdev);
1624 /* set in __drbd_set_state, unless CONFIG_PENDING was set */
1625 if (test_bit(DEVICE_DYING, &mdev->flags))
1626 drbd_thread_stop_nowait(&mdev->worker);
1633 static int drbd_thread_setup(void *arg)
1635 struct drbd_thread *thi = (struct drbd_thread *) arg;
1636 struct drbd_conf *mdev = thi->mdev;
1637 unsigned long flags;
1641 retval = thi->function(thi);
1643 spin_lock_irqsave(&thi->t_lock, flags);
1645 /* if the receiver has been "Exiting", the last thing it did
1646 * was set the conn state to "StandAlone",
1647 * if now a re-connect request comes in, conn state goes C_UNCONNECTED,
1648 * and receiver thread will be "started".
1649 * drbd_thread_start needs to set "Restarting" in that case.
1650 * t_state check and assignment needs to be within the same spinlock,
1651 * so either thread_start sees Exiting, and can remap to Restarting,
1652 * or thread_start see None, and can proceed as normal.
1655 if (thi->t_state == Restarting) {
1656 dev_info(DEV, "Restarting %s\n", current->comm);
1657 thi->t_state = Running;
1658 spin_unlock_irqrestore(&thi->t_lock, flags);
1663 thi->t_state = None;
1665 complete(&thi->stop);
1666 spin_unlock_irqrestore(&thi->t_lock, flags);
1668 dev_info(DEV, "Terminating %s\n", current->comm);
1670 /* Release mod reference taken when thread was started */
1671 module_put(THIS_MODULE);
1675 static void drbd_thread_init(struct drbd_conf *mdev, struct drbd_thread *thi,
1676 int (*func) (struct drbd_thread *))
1678 spin_lock_init(&thi->t_lock);
1680 thi->t_state = None;
1681 thi->function = func;
1685 int drbd_thread_start(struct drbd_thread *thi)
1687 struct drbd_conf *mdev = thi->mdev;
1688 struct task_struct *nt;
1689 unsigned long flags;
1692 thi == &mdev->receiver ? "receiver" :
1693 thi == &mdev->asender ? "asender" :
1694 thi == &mdev->worker ? "worker" : "NONSENSE";
1696 /* is used from state engine doing drbd_thread_stop_nowait,
1697 * while holding the req lock irqsave */
1698 spin_lock_irqsave(&thi->t_lock, flags);
1700 switch (thi->t_state) {
1702 dev_info(DEV, "Starting %s thread (from %s [%d])\n",
1703 me, current->comm, current->pid);
1705 /* Get ref on module for thread - this is released when thread exits */
1706 if (!try_module_get(THIS_MODULE)) {
1707 dev_err(DEV, "Failed to get module reference in drbd_thread_start\n");
1708 spin_unlock_irqrestore(&thi->t_lock, flags);
1712 init_completion(&thi->stop);
1713 D_ASSERT(thi->task == NULL);
1714 thi->reset_cpu_mask = 1;
1715 thi->t_state = Running;
1716 spin_unlock_irqrestore(&thi->t_lock, flags);
1717 flush_signals(current); /* otherw. may get -ERESTARTNOINTR */
1719 nt = kthread_create(drbd_thread_setup, (void *) thi,
1720 "drbd%d_%s", mdev_to_minor(mdev), me);
1723 dev_err(DEV, "Couldn't start thread\n");
1725 module_put(THIS_MODULE);
1728 spin_lock_irqsave(&thi->t_lock, flags);
1730 thi->t_state = Running;
1731 spin_unlock_irqrestore(&thi->t_lock, flags);
1732 wake_up_process(nt);
1735 thi->t_state = Restarting;
1736 dev_info(DEV, "Restarting %s thread (from %s [%d])\n",
1737 me, current->comm, current->pid);
1742 spin_unlock_irqrestore(&thi->t_lock, flags);
1750 void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait)
1752 unsigned long flags;
1754 enum drbd_thread_state ns = restart ? Restarting : Exiting;
1756 /* may be called from state engine, holding the req lock irqsave */
1757 spin_lock_irqsave(&thi->t_lock, flags);
1759 if (thi->t_state == None) {
1760 spin_unlock_irqrestore(&thi->t_lock, flags);
1762 drbd_thread_start(thi);
1766 if (thi->t_state != ns) {
1767 if (thi->task == NULL) {
1768 spin_unlock_irqrestore(&thi->t_lock, flags);
1774 init_completion(&thi->stop);
1775 if (thi->task != current)
1776 force_sig(DRBD_SIGKILL, thi->task);
1780 spin_unlock_irqrestore(&thi->t_lock, flags);
1783 wait_for_completion(&thi->stop);
1788 * drbd_calc_cpu_mask() - Generate CPU masks, spread over all CPUs
1789 * @mdev: DRBD device.
1791 * Forces all threads of a device onto the same CPU. This is beneficial for
1792 * DRBD's performance. May be overwritten by user's configuration.
1794 void drbd_calc_cpu_mask(struct drbd_conf *mdev)
1798 /* user override. */
1799 if (cpumask_weight(mdev->cpu_mask))
1802 ord = mdev_to_minor(mdev) % cpumask_weight(cpu_online_mask);
1803 for_each_online_cpu(cpu) {
1805 cpumask_set_cpu(cpu, mdev->cpu_mask);
1809 /* should not be reached */
1810 cpumask_setall(mdev->cpu_mask);
1814 * drbd_thread_current_set_cpu() - modifies the cpu mask of the _current_ thread
1815 * @mdev: DRBD device.
1817 * call in the "main loop" of _all_ threads, no need for any mutex, current won't die
1820 void drbd_thread_current_set_cpu(struct drbd_conf *mdev)
1822 struct task_struct *p = current;
1823 struct drbd_thread *thi =
1824 p == mdev->asender.task ? &mdev->asender :
1825 p == mdev->receiver.task ? &mdev->receiver :
1826 p == mdev->worker.task ? &mdev->worker :
1830 if (!thi->reset_cpu_mask)
1832 thi->reset_cpu_mask = 0;
1833 set_cpus_allowed_ptr(p, mdev->cpu_mask);
1837 /* the appropriate socket mutex must be held already */
1838 int _drbd_send_cmd(struct drbd_conf *mdev, struct socket *sock,
1839 enum drbd_packets cmd, struct p_header80 *h,
1840 size_t size, unsigned msg_flags)
1844 ERR_IF(!h) return false;
1845 ERR_IF(!size) return false;
1847 h->magic = BE_DRBD_MAGIC;
1848 h->command = cpu_to_be16(cmd);
1849 h->length = cpu_to_be16(size-sizeof(struct p_header80));
1851 sent = drbd_send(mdev, sock, h, size, msg_flags);
1853 ok = (sent == size);
1855 dev_err(DEV, "short sent %s size=%d sent=%d\n",
1856 cmdname(cmd), (int)size, sent);
1860 /* don't pass the socket. we may only look at it
1861 * when we hold the appropriate socket mutex.
1863 int drbd_send_cmd(struct drbd_conf *mdev, int use_data_socket,
1864 enum drbd_packets cmd, struct p_header80 *h, size_t size)
1867 struct socket *sock;
1869 if (use_data_socket) {
1870 mutex_lock(&mdev->data.mutex);
1871 sock = mdev->data.socket;
1873 mutex_lock(&mdev->meta.mutex);
1874 sock = mdev->meta.socket;
1877 /* drbd_disconnect() could have called drbd_free_sock()
1878 * while we were waiting in down()... */
1879 if (likely(sock != NULL))
1880 ok = _drbd_send_cmd(mdev, sock, cmd, h, size, 0);
1882 if (use_data_socket)
1883 mutex_unlock(&mdev->data.mutex);
1885 mutex_unlock(&mdev->meta.mutex);
1889 int drbd_send_cmd2(struct drbd_conf *mdev, enum drbd_packets cmd, char *data,
1892 struct p_header80 h;
1895 h.magic = BE_DRBD_MAGIC;
1896 h.command = cpu_to_be16(cmd);
1897 h.length = cpu_to_be16(size);
1899 if (!drbd_get_data_sock(mdev))
1903 drbd_send(mdev, mdev->data.socket, &h, sizeof(h), 0));
1905 drbd_send(mdev, mdev->data.socket, data, size, 0));
1907 drbd_put_data_sock(mdev);
1912 int drbd_send_sync_param(struct drbd_conf *mdev, struct syncer_conf *sc)
1914 struct p_rs_param_95 *p;
1915 struct socket *sock;
1917 const int apv = mdev->agreed_pro_version;
1919 size = apv <= 87 ? sizeof(struct p_rs_param)
1920 : apv == 88 ? sizeof(struct p_rs_param)
1921 + strlen(mdev->sync_conf.verify_alg) + 1
1922 : apv <= 94 ? sizeof(struct p_rs_param_89)
1923 : /* apv >= 95 */ sizeof(struct p_rs_param_95);
1925 /* used from admin command context and receiver/worker context.
1926 * to avoid kmalloc, grab the socket right here,
1927 * then use the pre-allocated sbuf there */
1928 mutex_lock(&mdev->data.mutex);
1929 sock = mdev->data.socket;
1931 if (likely(sock != NULL)) {
1932 enum drbd_packets cmd = apv >= 89 ? P_SYNC_PARAM89 : P_SYNC_PARAM;
1934 p = &mdev->data.sbuf.rs_param_95;
1936 /* initialize verify_alg and csums_alg */
1937 memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX);
1939 p->rate = cpu_to_be32(sc->rate);
1940 p->c_plan_ahead = cpu_to_be32(sc->c_plan_ahead);
1941 p->c_delay_target = cpu_to_be32(sc->c_delay_target);
1942 p->c_fill_target = cpu_to_be32(sc->c_fill_target);
1943 p->c_max_rate = cpu_to_be32(sc->c_max_rate);
1946 strcpy(p->verify_alg, mdev->sync_conf.verify_alg);
1948 strcpy(p->csums_alg, mdev->sync_conf.csums_alg);
1950 rv = _drbd_send_cmd(mdev, sock, cmd, &p->head, size, 0);
1952 rv = 0; /* not ok */
1954 mutex_unlock(&mdev->data.mutex);
1959 int drbd_send_protocol(struct drbd_conf *mdev)
1961 struct p_protocol *p;
1964 size = sizeof(struct p_protocol);
1966 if (mdev->agreed_pro_version >= 87)
1967 size += strlen(mdev->net_conf->integrity_alg) + 1;
1969 /* we must not recurse into our own queue,
1970 * as that is blocked during handshake */
1971 p = kmalloc(size, GFP_NOIO);
1975 p->protocol = cpu_to_be32(mdev->net_conf->wire_protocol);
1976 p->after_sb_0p = cpu_to_be32(mdev->net_conf->after_sb_0p);
1977 p->after_sb_1p = cpu_to_be32(mdev->net_conf->after_sb_1p);
1978 p->after_sb_2p = cpu_to_be32(mdev->net_conf->after_sb_2p);
1979 p->two_primaries = cpu_to_be32(mdev->net_conf->two_primaries);
1982 if (mdev->net_conf->want_lose)
1984 if (mdev->net_conf->dry_run) {
1985 if (mdev->agreed_pro_version >= 92)
1988 dev_err(DEV, "--dry-run is not supported by peer");
1993 p->conn_flags = cpu_to_be32(cf);
1995 if (mdev->agreed_pro_version >= 87)
1996 strcpy(p->integrity_alg, mdev->net_conf->integrity_alg);
1998 rv = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_PROTOCOL,
1999 (struct p_header80 *)p, size);
2004 int _drbd_send_uuids(struct drbd_conf *mdev, u64 uuid_flags)
2009 if (!get_ldev_if_state(mdev, D_NEGOTIATING))
2012 for (i = UI_CURRENT; i < UI_SIZE; i++)
2013 p.uuid[i] = mdev->ldev ? cpu_to_be64(mdev->ldev->md.uuid[i]) : 0;
2015 mdev->comm_bm_set = drbd_bm_total_weight(mdev);
2016 p.uuid[UI_SIZE] = cpu_to_be64(mdev->comm_bm_set);
2017 uuid_flags |= mdev->net_conf->want_lose ? 1 : 0;
2018 uuid_flags |= test_bit(CRASHED_PRIMARY, &mdev->flags) ? 2 : 0;
2019 uuid_flags |= mdev->new_state_tmp.disk == D_INCONSISTENT ? 4 : 0;
2020 p.uuid[UI_FLAGS] = cpu_to_be64(uuid_flags);
2024 return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_UUIDS,
2025 (struct p_header80 *)&p, sizeof(p));
2028 int drbd_send_uuids(struct drbd_conf *mdev)
2030 return _drbd_send_uuids(mdev, 0);
2033 int drbd_send_uuids_skip_initial_sync(struct drbd_conf *mdev)
2035 return _drbd_send_uuids(mdev, 8);
2038 int drbd_gen_and_send_sync_uuid(struct drbd_conf *mdev)
2043 D_ASSERT(mdev->state.disk == D_UP_TO_DATE);
2045 uuid = mdev->ldev->md.uuid[UI_BITMAP] + UUID_NEW_BM_OFFSET;
2046 drbd_uuid_set(mdev, UI_BITMAP, uuid);
2048 p.uuid = cpu_to_be64(uuid);
2050 return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_SYNC_UUID,
2051 (struct p_header80 *)&p, sizeof(p));
2054 int drbd_send_sizes(struct drbd_conf *mdev, int trigger_reply, enum dds_flags flags)
2057 sector_t d_size, u_size;
2061 if (get_ldev_if_state(mdev, D_NEGOTIATING)) {
2062 D_ASSERT(mdev->ldev->backing_bdev);
2063 d_size = drbd_get_max_capacity(mdev->ldev);
2064 u_size = mdev->ldev->dc.disk_size;
2065 q_order_type = drbd_queue_order_type(mdev);
2070 q_order_type = QUEUE_ORDERED_NONE;
2073 p.d_size = cpu_to_be64(d_size);
2074 p.u_size = cpu_to_be64(u_size);
2075 p.c_size = cpu_to_be64(trigger_reply ? 0 : drbd_get_capacity(mdev->this_bdev));
2076 p.max_bio_size = cpu_to_be32(queue_max_hw_sectors(mdev->rq_queue) << 9);
2077 p.queue_order_type = cpu_to_be16(q_order_type);
2078 p.dds_flags = cpu_to_be16(flags);
2080 ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_SIZES,
2081 (struct p_header80 *)&p, sizeof(p));
2086 * drbd_send_state() - Sends the drbd state to the peer
2087 * @mdev: DRBD device.
2089 int drbd_send_state(struct drbd_conf *mdev)
2091 struct socket *sock;
2095 /* Grab state lock so we wont send state if we're in the middle
2096 * of a cluster wide state change on another thread */
2097 drbd_state_lock(mdev);
2099 mutex_lock(&mdev->data.mutex);
2101 p.state = cpu_to_be32(mdev->state.i); /* Within the send mutex */
2102 sock = mdev->data.socket;
2104 if (likely(sock != NULL)) {
2105 ok = _drbd_send_cmd(mdev, sock, P_STATE,
2106 (struct p_header80 *)&p, sizeof(p), 0);
2109 mutex_unlock(&mdev->data.mutex);
2111 drbd_state_unlock(mdev);
2115 int drbd_send_state_req(struct drbd_conf *mdev,
2116 union drbd_state mask, union drbd_state val)
2118 struct p_req_state p;
2120 p.mask = cpu_to_be32(mask.i);
2121 p.val = cpu_to_be32(val.i);
2123 return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_STATE_CHG_REQ,
2124 (struct p_header80 *)&p, sizeof(p));
2127 int drbd_send_sr_reply(struct drbd_conf *mdev, enum drbd_state_rv retcode)
2129 struct p_req_state_reply p;
2131 p.retcode = cpu_to_be32(retcode);
2133 return drbd_send_cmd(mdev, USE_META_SOCKET, P_STATE_CHG_REPLY,
2134 (struct p_header80 *)&p, sizeof(p));
2137 int fill_bitmap_rle_bits(struct drbd_conf *mdev,
2138 struct p_compressed_bm *p,
2139 struct bm_xfer_ctx *c)
2141 struct bitstream bs;
2142 unsigned long plain_bits;
2149 /* may we use this feature? */
2150 if ((mdev->sync_conf.use_rle == 0) ||
2151 (mdev->agreed_pro_version < 90))
2154 if (c->bit_offset >= c->bm_bits)
2155 return 0; /* nothing to do. */
2157 /* use at most thus many bytes */
2158 bitstream_init(&bs, p->code, BM_PACKET_VLI_BYTES_MAX, 0);
2159 memset(p->code, 0, BM_PACKET_VLI_BYTES_MAX);
2160 /* plain bits covered in this code string */
2163 /* p->encoding & 0x80 stores whether the first run length is set.
2164 * bit offset is implicit.
2165 * start with toggle == 2 to be able to tell the first iteration */
2168 /* see how much plain bits we can stuff into one packet
2169 * using RLE and VLI. */
2171 tmp = (toggle == 0) ? _drbd_bm_find_next_zero(mdev, c->bit_offset)
2172 : _drbd_bm_find_next(mdev, c->bit_offset);
2175 rl = tmp - c->bit_offset;
2177 if (toggle == 2) { /* first iteration */
2179 /* the first checked bit was set,
2180 * store start value, */
2181 DCBP_set_start(p, 1);
2182 /* but skip encoding of zero run length */
2186 DCBP_set_start(p, 0);
2189 /* paranoia: catch zero runlength.
2190 * can only happen if bitmap is modified while we scan it. */
2192 dev_err(DEV, "unexpected zero runlength while encoding bitmap "
2193 "t:%u bo:%lu\n", toggle, c->bit_offset);
2197 bits = vli_encode_bits(&bs, rl);
2198 if (bits == -ENOBUFS) /* buffer full */
2201 dev_err(DEV, "error while encoding bitmap: %d\n", bits);
2207 c->bit_offset = tmp;
2208 } while (c->bit_offset < c->bm_bits);
2210 len = bs.cur.b - p->code + !!bs.cur.bit;
2212 if (plain_bits < (len << 3)) {
2213 /* incompressible with this method.
2214 * we need to rewind both word and bit position. */
2215 c->bit_offset -= plain_bits;
2216 bm_xfer_ctx_bit_to_word_offset(c);
2217 c->bit_offset = c->word_offset * BITS_PER_LONG;
2221 /* RLE + VLI was able to compress it just fine.
2222 * update c->word_offset. */
2223 bm_xfer_ctx_bit_to_word_offset(c);
2225 /* store pad_bits */
2226 DCBP_set_pad_bits(p, (8 - bs.cur.bit) & 0x7);
2232 * send_bitmap_rle_or_plain
2234 * Return 0 when done, 1 when another iteration is needed, and a negative error
2235 * code upon failure.
2238 send_bitmap_rle_or_plain(struct drbd_conf *mdev,
2239 struct p_header80 *h, struct bm_xfer_ctx *c)
2241 struct p_compressed_bm *p = (void*)h;
2242 unsigned long num_words;
2246 len = fill_bitmap_rle_bits(mdev, p, c);
2252 DCBP_set_code(p, RLE_VLI_Bits);
2253 ok = _drbd_send_cmd(mdev, mdev->data.socket, P_COMPRESSED_BITMAP, h,
2254 sizeof(*p) + len, 0);
2257 c->bytes[0] += sizeof(*p) + len;
2259 if (c->bit_offset >= c->bm_bits)
2262 /* was not compressible.
2263 * send a buffer full of plain text bits instead. */
2264 num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset);
2265 len = num_words * sizeof(long);
2267 drbd_bm_get_lel(mdev, c->word_offset, num_words, (unsigned long*)h->payload);
2268 ok = _drbd_send_cmd(mdev, mdev->data.socket, P_BITMAP,
2269 h, sizeof(struct p_header80) + len, 0);
2270 c->word_offset += num_words;
2271 c->bit_offset = c->word_offset * BITS_PER_LONG;
2274 c->bytes[1] += sizeof(struct p_header80) + len;
2276 if (c->bit_offset > c->bm_bits)
2277 c->bit_offset = c->bm_bits;
2281 INFO_bm_xfer_stats(mdev, "send", c);
2289 /* See the comment at receive_bitmap() */
2290 int _drbd_send_bitmap(struct drbd_conf *mdev)
2292 struct bm_xfer_ctx c;
2293 struct p_header80 *p;
2296 ERR_IF(!mdev->bitmap) return false;
2298 /* maybe we should use some per thread scratch page,
2299 * and allocate that during initial device creation? */
2300 p = (struct p_header80 *) __get_free_page(GFP_NOIO);
2302 dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__);
2306 if (get_ldev(mdev)) {
2307 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
2308 dev_info(DEV, "Writing the whole bitmap, MDF_FullSync was set.\n");
2309 drbd_bm_set_all(mdev);
2310 if (drbd_bm_write(mdev)) {
2311 /* write_bm did fail! Leave full sync flag set in Meta P_DATA
2312 * but otherwise process as per normal - need to tell other
2313 * side that a full resync is required! */
2314 dev_err(DEV, "Failed to write bitmap to disk!\n");
2316 drbd_md_clear_flag(mdev, MDF_FULL_SYNC);
2323 c = (struct bm_xfer_ctx) {
2324 .bm_bits = drbd_bm_bits(mdev),
2325 .bm_words = drbd_bm_words(mdev),
2329 err = send_bitmap_rle_or_plain(mdev, p, &c);
2332 free_page((unsigned long) p);
2336 int drbd_send_bitmap(struct drbd_conf *mdev)
2340 if (!drbd_get_data_sock(mdev))
2342 err = !_drbd_send_bitmap(mdev);
2343 drbd_put_data_sock(mdev);
2347 int drbd_send_b_ack(struct drbd_conf *mdev, u32 barrier_nr, u32 set_size)
2350 struct p_barrier_ack p;
2352 p.barrier = barrier_nr;
2353 p.set_size = cpu_to_be32(set_size);
2355 if (mdev->state.conn < C_CONNECTED)
2357 ok = drbd_send_cmd(mdev, USE_META_SOCKET, P_BARRIER_ACK,
2358 (struct p_header80 *)&p, sizeof(p));
2363 * _drbd_send_ack() - Sends an ack packet
2364 * @mdev: DRBD device.
2365 * @cmd: Packet command code.
2366 * @sector: sector, needs to be in big endian byte order
2367 * @blksize: size in byte, needs to be in big endian byte order
2368 * @block_id: Id, big endian byte order
2370 static int _drbd_send_ack(struct drbd_conf *mdev, enum drbd_packets cmd,
2376 struct p_block_ack p;
2379 p.block_id = block_id;
2380 p.blksize = blksize;
2381 p.seq_num = cpu_to_be32(atomic_add_return(1, &mdev->packet_seq));
2383 if (!mdev->meta.socket || mdev->state.conn < C_CONNECTED)
2385 ok = drbd_send_cmd(mdev, USE_META_SOCKET, cmd,
2386 (struct p_header80 *)&p, sizeof(p));
2390 /* dp->sector and dp->block_id already/still in network byte order,
2391 * data_size is payload size according to dp->head,
2392 * and may need to be corrected for digest size. */
2393 int drbd_send_ack_dp(struct drbd_conf *mdev, enum drbd_packets cmd,
2394 struct p_data *dp, int data_size)
2396 data_size -= (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ?
2397 crypto_hash_digestsize(mdev->integrity_r_tfm) : 0;
2398 return _drbd_send_ack(mdev, cmd, dp->sector, cpu_to_be32(data_size),
2402 int drbd_send_ack_rp(struct drbd_conf *mdev, enum drbd_packets cmd,
2403 struct p_block_req *rp)
2405 return _drbd_send_ack(mdev, cmd, rp->sector, rp->blksize, rp->block_id);
2409 * drbd_send_ack() - Sends an ack packet
2410 * @mdev: DRBD device.
2411 * @cmd: Packet command code.
2414 int drbd_send_ack(struct drbd_conf *mdev,
2415 enum drbd_packets cmd, struct drbd_epoch_entry *e)
2417 return _drbd_send_ack(mdev, cmd,
2418 cpu_to_be64(e->sector),
2419 cpu_to_be32(e->size),
2423 /* This function misuses the block_id field to signal if the blocks
2424 * are is sync or not. */
2425 int drbd_send_ack_ex(struct drbd_conf *mdev, enum drbd_packets cmd,
2426 sector_t sector, int blksize, u64 block_id)
2428 return _drbd_send_ack(mdev, cmd,
2429 cpu_to_be64(sector),
2430 cpu_to_be32(blksize),
2431 cpu_to_be64(block_id));
2434 int drbd_send_drequest(struct drbd_conf *mdev, int cmd,
2435 sector_t sector, int size, u64 block_id)
2438 struct p_block_req p;
2440 p.sector = cpu_to_be64(sector);
2441 p.block_id = block_id;
2442 p.blksize = cpu_to_be32(size);
2444 ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, cmd,
2445 (struct p_header80 *)&p, sizeof(p));
2449 int drbd_send_drequest_csum(struct drbd_conf *mdev,
2450 sector_t sector, int size,
2451 void *digest, int digest_size,
2452 enum drbd_packets cmd)
2455 struct p_block_req p;
2457 p.sector = cpu_to_be64(sector);
2458 p.block_id = BE_DRBD_MAGIC + 0xbeef;
2459 p.blksize = cpu_to_be32(size);
2461 p.head.magic = BE_DRBD_MAGIC;
2462 p.head.command = cpu_to_be16(cmd);
2463 p.head.length = cpu_to_be16(sizeof(p) - sizeof(struct p_header80) + digest_size);
2465 mutex_lock(&mdev->data.mutex);
2467 ok = (sizeof(p) == drbd_send(mdev, mdev->data.socket, &p, sizeof(p), 0));
2468 ok = ok && (digest_size == drbd_send(mdev, mdev->data.socket, digest, digest_size, 0));
2470 mutex_unlock(&mdev->data.mutex);
2475 int drbd_send_ov_request(struct drbd_conf *mdev, sector_t sector, int size)
2478 struct p_block_req p;
2480 p.sector = cpu_to_be64(sector);
2481 p.block_id = BE_DRBD_MAGIC + 0xbabe;
2482 p.blksize = cpu_to_be32(size);
2484 ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_OV_REQUEST,
2485 (struct p_header80 *)&p, sizeof(p));
2489 /* called on sndtimeo
2490 * returns false if we should retry,
2491 * true if we think connection is dead
2493 static int we_should_drop_the_connection(struct drbd_conf *mdev, struct socket *sock)
2496 /* long elapsed = (long)(jiffies - mdev->last_received); */
2498 drop_it = mdev->meta.socket == sock
2499 || !mdev->asender.task
2500 || get_t_state(&mdev->asender) != Running
2501 || mdev->state.conn < C_CONNECTED;
2506 drop_it = !--mdev->ko_count;
2508 dev_err(DEV, "[%s/%d] sock_sendmsg time expired, ko = %u\n",
2509 current->comm, current->pid, mdev->ko_count);
2513 return drop_it; /* && (mdev->state == R_PRIMARY) */;
2516 /* The idea of sendpage seems to be to put some kind of reference
2517 * to the page into the skb, and to hand it over to the NIC. In
2518 * this process get_page() gets called.
2520 * As soon as the page was really sent over the network put_page()
2521 * gets called by some part of the network layer. [ NIC driver? ]
2523 * [ get_page() / put_page() increment/decrement the count. If count
2524 * reaches 0 the page will be freed. ]
2526 * This works nicely with pages from FSs.
2527 * But this means that in protocol A we might signal IO completion too early!
2529 * In order not to corrupt data during a resync we must make sure
2530 * that we do not reuse our own buffer pages (EEs) to early, therefore
2531 * we have the net_ee list.
2533 * XFS seems to have problems, still, it submits pages with page_count == 0!
2534 * As a workaround, we disable sendpage on pages
2535 * with page_count == 0 or PageSlab.
2537 static int _drbd_no_send_page(struct drbd_conf *mdev, struct page *page,
2538 int offset, size_t size, unsigned msg_flags)
2540 int sent = drbd_send(mdev, mdev->data.socket, kmap(page) + offset, size, msg_flags);
2543 mdev->send_cnt += size>>9;
2544 return sent == size;
2547 static int _drbd_send_page(struct drbd_conf *mdev, struct page *page,
2548 int offset, size_t size, unsigned msg_flags)
2550 mm_segment_t oldfs = get_fs();
2554 /* e.g. XFS meta- & log-data is in slab pages, which have a
2555 * page_count of 0 and/or have PageSlab() set.
2556 * we cannot use send_page for those, as that does get_page();
2557 * put_page(); and would cause either a VM_BUG directly, or
2558 * __page_cache_release a page that would actually still be referenced
2559 * by someone, leading to some obscure delayed Oops somewhere else. */
2560 if (disable_sendpage || (page_count(page) < 1) || PageSlab(page))
2561 return _drbd_no_send_page(mdev, page, offset, size, msg_flags);
2563 msg_flags |= MSG_NOSIGNAL;
2564 drbd_update_congested(mdev);
2567 sent = mdev->data.socket->ops->sendpage(mdev->data.socket, page,
2570 if (sent == -EAGAIN) {
2571 if (we_should_drop_the_connection(mdev,
2578 dev_warn(DEV, "%s: size=%d len=%d sent=%d\n",
2579 __func__, (int)size, len, sent);
2584 } while (len > 0 /* THINK && mdev->cstate >= C_CONNECTED*/);
2586 clear_bit(NET_CONGESTED, &mdev->flags);
2590 mdev->send_cnt += size>>9;
2594 static int _drbd_send_bio(struct drbd_conf *mdev, struct bio *bio)
2596 struct bio_vec *bvec;
2598 /* hint all but last page with MSG_MORE */
2599 __bio_for_each_segment(bvec, bio, i, 0) {
2600 if (!_drbd_no_send_page(mdev, bvec->bv_page,
2601 bvec->bv_offset, bvec->bv_len,
2602 i == bio->bi_vcnt -1 ? 0 : MSG_MORE))
2608 static int _drbd_send_zc_bio(struct drbd_conf *mdev, struct bio *bio)
2610 struct bio_vec *bvec;
2612 /* hint all but last page with MSG_MORE */
2613 __bio_for_each_segment(bvec, bio, i, 0) {
2614 if (!_drbd_send_page(mdev, bvec->bv_page,
2615 bvec->bv_offset, bvec->bv_len,
2616 i == bio->bi_vcnt -1 ? 0 : MSG_MORE))
2622 static int _drbd_send_zc_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e)
2624 struct page *page = e->pages;
2625 unsigned len = e->size;
2626 /* hint all but last page with MSG_MORE */
2627 page_chain_for_each(page) {
2628 unsigned l = min_t(unsigned, len, PAGE_SIZE);
2629 if (!_drbd_send_page(mdev, page, 0, l,
2630 page_chain_next(page) ? MSG_MORE : 0))
2637 static u32 bio_flags_to_wire(struct drbd_conf *mdev, unsigned long bi_rw)
2639 if (mdev->agreed_pro_version >= 95)
2640 return (bi_rw & REQ_SYNC ? DP_RW_SYNC : 0) |
2641 (bi_rw & REQ_FUA ? DP_FUA : 0) |
2642 (bi_rw & REQ_FLUSH ? DP_FLUSH : 0) |
2643 (bi_rw & REQ_DISCARD ? DP_DISCARD : 0);
2645 return bi_rw & REQ_SYNC ? DP_RW_SYNC : 0;
2648 /* Used to send write requests
2649 * R_PRIMARY -> Peer (P_DATA)
2651 int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req)
2655 unsigned int dp_flags = 0;
2659 if (!drbd_get_data_sock(mdev))
2662 dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_w_tfm) ?
2663 crypto_hash_digestsize(mdev->integrity_w_tfm) : 0;
2665 if (req->size <= DRBD_MAX_SIZE_H80_PACKET) {
2666 p.head.h80.magic = BE_DRBD_MAGIC;
2667 p.head.h80.command = cpu_to_be16(P_DATA);
2669 cpu_to_be16(sizeof(p) - sizeof(union p_header) + dgs + req->size);
2671 p.head.h95.magic = BE_DRBD_MAGIC_BIG;
2672 p.head.h95.command = cpu_to_be16(P_DATA);
2674 cpu_to_be32(sizeof(p) - sizeof(union p_header) + dgs + req->size);
2677 p.sector = cpu_to_be64(req->sector);
2678 p.block_id = (unsigned long)req;
2679 p.seq_num = cpu_to_be32(req->seq_num =
2680 atomic_add_return(1, &mdev->packet_seq));
2682 dp_flags = bio_flags_to_wire(mdev, req->master_bio->bi_rw);
2684 if (mdev->state.conn >= C_SYNC_SOURCE &&
2685 mdev->state.conn <= C_PAUSED_SYNC_T)
2686 dp_flags |= DP_MAY_SET_IN_SYNC;
2688 p.dp_flags = cpu_to_be32(dp_flags);
2689 set_bit(UNPLUG_REMOTE, &mdev->flags);
2691 drbd_send(mdev, mdev->data.socket, &p, sizeof(p), dgs ? MSG_MORE : 0));
2693 dgb = mdev->int_dig_out;
2694 drbd_csum_bio(mdev, mdev->integrity_w_tfm, req->master_bio, dgb);
2695 ok = dgs == drbd_send(mdev, mdev->data.socket, dgb, dgs, 0);
2698 /* For protocol A, we have to memcpy the payload into
2699 * socket buffers, as we may complete right away
2700 * as soon as we handed it over to tcp, at which point the data
2701 * pages may become invalid.
2703 * For data-integrity enabled, we copy it as well, so we can be
2704 * sure that even if the bio pages may still be modified, it
2705 * won't change the data on the wire, thus if the digest checks
2706 * out ok after sending on this side, but does not fit on the
2707 * receiving side, we sure have detected corruption elsewhere.
2709 if (mdev->net_conf->wire_protocol == DRBD_PROT_A || dgs)
2710 ok = _drbd_send_bio(mdev, req->master_bio);
2712 ok = _drbd_send_zc_bio(mdev, req->master_bio);
2714 /* double check digest, sometimes buffers have been modified in flight. */
2715 if (dgs > 0 && dgs <= 64) {
2716 /* 64 byte, 512 bit, is the larges digest size
2717 * currently supported in kernel crypto. */
2718 unsigned char digest[64];
2719 drbd_csum_bio(mdev, mdev->integrity_w_tfm, req->master_bio, digest);
2720 if (memcmp(mdev->int_dig_out, digest, dgs)) {
2722 "Digest mismatch, buffer modified by upper layers during write: %llus +%u\n",
2723 (unsigned long long)req->sector, req->size);
2725 } /* else if (dgs > 64) {
2726 ... Be noisy about digest too large ...
2730 drbd_put_data_sock(mdev);
2735 /* answer packet, used to send data back for read requests:
2736 * Peer -> (diskless) R_PRIMARY (P_DATA_REPLY)
2737 * C_SYNC_SOURCE -> C_SYNC_TARGET (P_RS_DATA_REPLY)
2739 int drbd_send_block(struct drbd_conf *mdev, enum drbd_packets cmd,
2740 struct drbd_epoch_entry *e)
2747 dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_w_tfm) ?
2748 crypto_hash_digestsize(mdev->integrity_w_tfm) : 0;
2750 if (e->size <= DRBD_MAX_SIZE_H80_PACKET) {
2751 p.head.h80.magic = BE_DRBD_MAGIC;
2752 p.head.h80.command = cpu_to_be16(cmd);
2754 cpu_to_be16(sizeof(p) - sizeof(struct p_header80) + dgs + e->size);
2756 p.head.h95.magic = BE_DRBD_MAGIC_BIG;
2757 p.head.h95.command = cpu_to_be16(cmd);
2759 cpu_to_be32(sizeof(p) - sizeof(struct p_header80) + dgs + e->size);
2762 p.sector = cpu_to_be64(e->sector);
2763 p.block_id = e->block_id;
2764 /* p.seq_num = 0; No sequence numbers here.. */
2766 /* Only called by our kernel thread.
2767 * This one may be interrupted by DRBD_SIG and/or DRBD_SIGKILL
2768 * in response to admin command or module unload.
2770 if (!drbd_get_data_sock(mdev))
2773 ok = sizeof(p) == drbd_send(mdev, mdev->data.socket, &p, sizeof(p), dgs ? MSG_MORE : 0);
2775 dgb = mdev->int_dig_out;
2776 drbd_csum_ee(mdev, mdev->integrity_w_tfm, e, dgb);
2777 ok = dgs == drbd_send(mdev, mdev->data.socket, dgb, dgs, 0);
2780 ok = _drbd_send_zc_ee(mdev, e);
2782 drbd_put_data_sock(mdev);
2787 int drbd_send_oos(struct drbd_conf *mdev, struct drbd_request *req)
2789 struct p_block_desc p;
2791 p.sector = cpu_to_be64(req->sector);
2792 p.blksize = cpu_to_be32(req->size);
2794 return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_OUT_OF_SYNC, &p.head, sizeof(p));
2798 drbd_send distinguishes two cases:
2800 Packets sent via the data socket "sock"
2801 and packets sent via the meta data socket "msock"
2804 -----------------+-------------------------+------------------------------
2805 timeout conf.timeout / 2 conf.timeout / 2
2806 timeout action send a ping via msock Abort communication
2807 and close all sockets
2811 * you must have down()ed the appropriate [m]sock_mutex elsewhere!
2813 int drbd_send(struct drbd_conf *mdev, struct socket *sock,
2814 void *buf, size_t size, unsigned msg_flags)
2823 /* THINK if (signal_pending) return ... ? */
2828 msg.msg_name = NULL;
2829 msg.msg_namelen = 0;
2830 msg.msg_control = NULL;
2831 msg.msg_controllen = 0;
2832 msg.msg_flags = msg_flags | MSG_NOSIGNAL;
2834 if (sock == mdev->data.socket) {
2835 mdev->ko_count = mdev->net_conf->ko_count;
2836 drbd_update_congested(mdev);
2840 * tcp_sendmsg does _not_ use its size parameter at all ?
2842 * -EAGAIN on timeout, -EINTR on signal.
2845 * do we need to block DRBD_SIG if sock == &meta.socket ??
2846 * otherwise wake_asender() might interrupt some send_*Ack !
2848 rv = kernel_sendmsg(sock, &msg, &iov, 1, size);
2849 if (rv == -EAGAIN) {
2850 if (we_should_drop_the_connection(mdev, sock))
2857 flush_signals(current);
2865 } while (sent < size);
2867 if (sock == mdev->data.socket)
2868 clear_bit(NET_CONGESTED, &mdev->flags);
2871 if (rv != -EAGAIN) {
2872 dev_err(DEV, "%s_sendmsg returned %d\n",
2873 sock == mdev->meta.socket ? "msock" : "sock",
2875 drbd_force_state(mdev, NS(conn, C_BROKEN_PIPE));
2877 drbd_force_state(mdev, NS(conn, C_TIMEOUT));
2883 static int drbd_open(struct block_device *bdev, fmode_t mode)
2885 struct drbd_conf *mdev = bdev->bd_disk->private_data;
2886 unsigned long flags;
2889 mutex_lock(&drbd_main_mutex);
2890 spin_lock_irqsave(&mdev->req_lock, flags);
2891 /* to have a stable mdev->state.role
2892 * and no race with updating open_cnt */
2894 if (mdev->state.role != R_PRIMARY) {
2895 if (mode & FMODE_WRITE)
2897 else if (!allow_oos)
2903 spin_unlock_irqrestore(&mdev->req_lock, flags);
2904 mutex_unlock(&drbd_main_mutex);
2909 static int drbd_release(struct gendisk *gd, fmode_t mode)
2911 struct drbd_conf *mdev = gd->private_data;
2912 mutex_lock(&drbd_main_mutex);
2914 mutex_unlock(&drbd_main_mutex);
2918 static void drbd_set_defaults(struct drbd_conf *mdev)
2920 /* This way we get a compile error when sync_conf grows,
2921 and we forgot to initialize it here */
2922 mdev->sync_conf = (struct syncer_conf) {
2923 /* .rate = */ DRBD_RATE_DEF,
2924 /* .after = */ DRBD_AFTER_DEF,
2925 /* .al_extents = */ DRBD_AL_EXTENTS_DEF,
2926 /* .verify_alg = */ {}, 0,
2927 /* .cpu_mask = */ {}, 0,
2928 /* .csums_alg = */ {}, 0,
2930 /* .on_no_data = */ DRBD_ON_NO_DATA_DEF,
2931 /* .c_plan_ahead = */ DRBD_C_PLAN_AHEAD_DEF,
2932 /* .c_delay_target = */ DRBD_C_DELAY_TARGET_DEF,
2933 /* .c_fill_target = */ DRBD_C_FILL_TARGET_DEF,
2934 /* .c_max_rate = */ DRBD_C_MAX_RATE_DEF,
2935 /* .c_min_rate = */ DRBD_C_MIN_RATE_DEF
2938 /* Have to use that way, because the layout differs between
2939 big endian and little endian */
2940 mdev->state = (union drbd_state) {
2941 { .role = R_SECONDARY,
2943 .conn = C_STANDALONE,
2952 void drbd_init_set_defaults(struct drbd_conf *mdev)
2954 /* the memset(,0,) did most of this.
2955 * note: only assignments, no allocation in here */
2957 drbd_set_defaults(mdev);
2959 atomic_set(&mdev->ap_bio_cnt, 0);
2960 atomic_set(&mdev->ap_pending_cnt, 0);
2961 atomic_set(&mdev->rs_pending_cnt, 0);
2962 atomic_set(&mdev->unacked_cnt, 0);
2963 atomic_set(&mdev->local_cnt, 0);
2964 atomic_set(&mdev->net_cnt, 0);
2965 atomic_set(&mdev->packet_seq, 0);
2966 atomic_set(&mdev->pp_in_use, 0);
2967 atomic_set(&mdev->pp_in_use_by_net, 0);
2968 atomic_set(&mdev->rs_sect_in, 0);
2969 atomic_set(&mdev->rs_sect_ev, 0);
2970 atomic_set(&mdev->ap_in_flight, 0);
2972 mutex_init(&mdev->md_io_mutex);
2973 mutex_init(&mdev->data.mutex);
2974 mutex_init(&mdev->meta.mutex);
2975 sema_init(&mdev->data.work.s, 0);
2976 sema_init(&mdev->meta.work.s, 0);
2977 mutex_init(&mdev->state_mutex);
2979 spin_lock_init(&mdev->data.work.q_lock);
2980 spin_lock_init(&mdev->meta.work.q_lock);
2982 spin_lock_init(&mdev->al_lock);
2983 spin_lock_init(&mdev->req_lock);
2984 spin_lock_init(&mdev->peer_seq_lock);
2985 spin_lock_init(&mdev->epoch_lock);
2987 INIT_LIST_HEAD(&mdev->active_ee);
2988 INIT_LIST_HEAD(&mdev->sync_ee);
2989 INIT_LIST_HEAD(&mdev->done_ee);
2990 INIT_LIST_HEAD(&mdev->read_ee);
2991 INIT_LIST_HEAD(&mdev->net_ee);
2992 INIT_LIST_HEAD(&mdev->resync_reads);
2993 INIT_LIST_HEAD(&mdev->data.work.q);
2994 INIT_LIST_HEAD(&mdev->meta.work.q);
2995 INIT_LIST_HEAD(&mdev->resync_work.list);
2996 INIT_LIST_HEAD(&mdev->unplug_work.list);
2997 INIT_LIST_HEAD(&mdev->go_diskless.list);
2998 INIT_LIST_HEAD(&mdev->md_sync_work.list);
2999 INIT_LIST_HEAD(&mdev->start_resync_work.list);
3000 INIT_LIST_HEAD(&mdev->bm_io_work.w.list);
3002 mdev->resync_work.cb = w_resync_timer;
3003 mdev->unplug_work.cb = w_send_write_hint;
3004 mdev->go_diskless.cb = w_go_diskless;
3005 mdev->md_sync_work.cb = w_md_sync;
3006 mdev->bm_io_work.w.cb = w_bitmap_io;
3007 mdev->start_resync_work.cb = w_start_resync;
3008 init_timer(&mdev->resync_timer);
3009 init_timer(&mdev->md_sync_timer);
3010 init_timer(&mdev->start_resync_timer);
3011 mdev->resync_timer.function = resync_timer_fn;
3012 mdev->resync_timer.data = (unsigned long) mdev;
3013 mdev->md_sync_timer.function = md_sync_timer_fn;
3014 mdev->md_sync_timer.data = (unsigned long) mdev;
3015 mdev->start_resync_timer.function = start_resync_timer_fn;
3016 mdev->start_resync_timer.data = (unsigned long) mdev;
3018 init_waitqueue_head(&mdev->misc_wait);
3019 init_waitqueue_head(&mdev->state_wait);
3020 init_waitqueue_head(&mdev->net_cnt_wait);
3021 init_waitqueue_head(&mdev->ee_wait);
3022 init_waitqueue_head(&mdev->al_wait);
3023 init_waitqueue_head(&mdev->seq_wait);
3025 drbd_thread_init(mdev, &mdev->receiver, drbdd_init);
3026 drbd_thread_init(mdev, &mdev->worker, drbd_worker);
3027 drbd_thread_init(mdev, &mdev->asender, drbd_asender);
3029 mdev->agreed_pro_version = PRO_VERSION_MAX;
3030 mdev->write_ordering = WO_bdev_flush;
3031 mdev->resync_wenr = LC_FREE;
3034 void drbd_mdev_cleanup(struct drbd_conf *mdev)
3037 if (mdev->receiver.t_state != None)
3038 dev_err(DEV, "ASSERT FAILED: receiver t_state == %d expected 0.\n",
3039 mdev->receiver.t_state);
3041 /* no need to lock it, I'm the only thread alive */
3042 if (atomic_read(&mdev->current_epoch->epoch_size) != 0)
3043 dev_err(DEV, "epoch_size:%d\n", atomic_read(&mdev->current_epoch->epoch_size));
3053 mdev->rs_failed = 0;
3054 mdev->rs_last_events = 0;
3055 mdev->rs_last_sect_ev = 0;
3056 for (i = 0; i < DRBD_SYNC_MARKS; i++) {
3057 mdev->rs_mark_left[i] = 0;
3058 mdev->rs_mark_time[i] = 0;
3060 D_ASSERT(mdev->net_conf == NULL);
3062 drbd_set_my_capacity(mdev, 0);
3064 /* maybe never allocated. */
3065 drbd_bm_resize(mdev, 0, 1);
3066 drbd_bm_cleanup(mdev);
3069 drbd_free_resources(mdev);
3070 clear_bit(AL_SUSPENDED, &mdev->flags);
3073 * currently we drbd_init_ee only on module load, so
3074 * we may do drbd_release_ee only on module unload!
3076 D_ASSERT(list_empty(&mdev->active_ee));
3077 D_ASSERT(list_empty(&mdev->sync_ee));
3078 D_ASSERT(list_empty(&mdev->done_ee));
3079 D_ASSERT(list_empty(&mdev->read_ee));
3080 D_ASSERT(list_empty(&mdev->net_ee));
3081 D_ASSERT(list_empty(&mdev->resync_reads));
3082 D_ASSERT(list_empty(&mdev->data.work.q));
3083 D_ASSERT(list_empty(&mdev->meta.work.q));
3084 D_ASSERT(list_empty(&mdev->resync_work.list));
3085 D_ASSERT(list_empty(&mdev->unplug_work.list));
3086 D_ASSERT(list_empty(&mdev->go_diskless.list));
3088 drbd_set_defaults(mdev);
3092 static void drbd_destroy_mempools(void)
3096 while (drbd_pp_pool) {
3097 page = drbd_pp_pool;
3098 drbd_pp_pool = (struct page *)page_private(page);
3103 /* D_ASSERT(atomic_read(&drbd_pp_vacant)==0); */
3105 if (drbd_ee_mempool)
3106 mempool_destroy(drbd_ee_mempool);
3107 if (drbd_request_mempool)
3108 mempool_destroy(drbd_request_mempool);
3110 kmem_cache_destroy(drbd_ee_cache);
3111 if (drbd_request_cache)
3112 kmem_cache_destroy(drbd_request_cache);
3113 if (drbd_bm_ext_cache)
3114 kmem_cache_destroy(drbd_bm_ext_cache);
3115 if (drbd_al_ext_cache)
3116 kmem_cache_destroy(drbd_al_ext_cache);
3118 drbd_ee_mempool = NULL;
3119 drbd_request_mempool = NULL;
3120 drbd_ee_cache = NULL;
3121 drbd_request_cache = NULL;
3122 drbd_bm_ext_cache = NULL;
3123 drbd_al_ext_cache = NULL;
3128 static int drbd_create_mempools(void)
3131 const int number = (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * minor_count;
3134 /* prepare our caches and mempools */
3135 drbd_request_mempool = NULL;
3136 drbd_ee_cache = NULL;
3137 drbd_request_cache = NULL;
3138 drbd_bm_ext_cache = NULL;
3139 drbd_al_ext_cache = NULL;
3140 drbd_pp_pool = NULL;
3143 drbd_request_cache = kmem_cache_create(
3144 "drbd_req", sizeof(struct drbd_request), 0, 0, NULL);
3145 if (drbd_request_cache == NULL)
3148 drbd_ee_cache = kmem_cache_create(
3149 "drbd_ee", sizeof(struct drbd_epoch_entry), 0, 0, NULL);
3150 if (drbd_ee_cache == NULL)
3153 drbd_bm_ext_cache = kmem_cache_create(
3154 "drbd_bm", sizeof(struct bm_extent), 0, 0, NULL);
3155 if (drbd_bm_ext_cache == NULL)
3158 drbd_al_ext_cache = kmem_cache_create(
3159 "drbd_al", sizeof(struct lc_element), 0, 0, NULL);
3160 if (drbd_al_ext_cache == NULL)
3164 drbd_request_mempool = mempool_create(number,
3165 mempool_alloc_slab, mempool_free_slab, drbd_request_cache);
3166 if (drbd_request_mempool == NULL)
3169 drbd_ee_mempool = mempool_create(number,
3170 mempool_alloc_slab, mempool_free_slab, drbd_ee_cache);
3171 if (drbd_ee_mempool == NULL)
3174 /* drbd's page pool */
3175 spin_lock_init(&drbd_pp_lock);
3177 for (i = 0; i < number; i++) {
3178 page = alloc_page(GFP_HIGHUSER);
3181 set_page_private(page, (unsigned long)drbd_pp_pool);
3182 drbd_pp_pool = page;
3184 drbd_pp_vacant = number;
3189 drbd_destroy_mempools(); /* in case we allocated some */
3193 static int drbd_notify_sys(struct notifier_block *this, unsigned long code,
3196 /* just so we have it. you never know what interesting things we
3197 * might want to do here some day...
3203 static struct notifier_block drbd_notifier = {
3204 .notifier_call = drbd_notify_sys,
3207 static void drbd_release_ee_lists(struct drbd_conf *mdev)
3211 rr = drbd_release_ee(mdev, &mdev->active_ee);
3213 dev_err(DEV, "%d EEs in active list found!\n", rr);
3215 rr = drbd_release_ee(mdev, &mdev->sync_ee);
3217 dev_err(DEV, "%d EEs in sync list found!\n", rr);
3219 rr = drbd_release_ee(mdev, &mdev->read_ee);
3221 dev_err(DEV, "%d EEs in read list found!\n", rr);
3223 rr = drbd_release_ee(mdev, &mdev->done_ee);
3225 dev_err(DEV, "%d EEs in done list found!\n", rr);
3227 rr = drbd_release_ee(mdev, &mdev->net_ee);
3229 dev_err(DEV, "%d EEs in net list found!\n", rr);
3232 /* caution. no locking.
3233 * currently only used from module cleanup code. */
3234 static void drbd_delete_device(unsigned int minor)
3236 struct drbd_conf *mdev = minor_to_mdev(minor);
3241 /* paranoia asserts */
3242 if (mdev->open_cnt != 0)
3243 dev_err(DEV, "open_cnt = %d in %s:%u", mdev->open_cnt,
3244 __FILE__ , __LINE__);
3246 ERR_IF (!list_empty(&mdev->data.work.q)) {
3247 struct list_head *lp;
3248 list_for_each(lp, &mdev->data.work.q) {
3249 dev_err(DEV, "lp = %p\n", lp);
3252 /* end paranoia asserts */
3254 del_gendisk(mdev->vdisk);
3256 /* cleanup stuff that may have been allocated during
3257 * device (re-)configuration or state changes */
3259 if (mdev->this_bdev)
3260 bdput(mdev->this_bdev);
3262 drbd_free_resources(mdev);
3264 drbd_release_ee_lists(mdev);
3266 /* should be free'd on disconnect? */
3267 kfree(mdev->ee_hash);
3269 mdev->ee_hash_s = 0;
3270 mdev->ee_hash = NULL;
3273 lc_destroy(mdev->act_log);
3274 lc_destroy(mdev->resync);
3276 kfree(mdev->p_uuid);
3277 /* mdev->p_uuid = NULL; */
3279 kfree(mdev->int_dig_out);
3280 kfree(mdev->int_dig_in);
3281 kfree(mdev->int_dig_vv);
3283 /* cleanup the rest that has been
3284 * allocated from drbd_new_device
3285 * and actually free the mdev itself */
3286 drbd_free_mdev(mdev);
3289 static void drbd_cleanup(void)
3293 unregister_reboot_notifier(&drbd_notifier);
3295 /* first remove proc,
3296 * drbdsetup uses it's presence to detect
3297 * whether DRBD is loaded.
3298 * If we would get stuck in proc removal,
3299 * but have netlink already deregistered,
3300 * some drbdsetup commands may wait forever
3304 remove_proc_entry("drbd", NULL);
3311 drbd_delete_device(i);
3312 drbd_destroy_mempools();
3317 unregister_blkdev(DRBD_MAJOR, "drbd");
3319 printk(KERN_INFO "drbd: module cleanup done.\n");
3323 * drbd_congested() - Callback for pdflush
3324 * @congested_data: User data
3325 * @bdi_bits: Bits pdflush is currently interested in
3327 * Returns 1<<BDI_async_congested and/or 1<<BDI_sync_congested if we are congested.
3329 static int drbd_congested(void *congested_data, int bdi_bits)
3331 struct drbd_conf *mdev = congested_data;
3332 struct request_queue *q;
3336 if (!may_inc_ap_bio(mdev)) {
3337 /* DRBD has frozen IO */
3343 if (get_ldev(mdev)) {
3344 q = bdev_get_queue(mdev->ldev->backing_bdev);
3345 r = bdi_congested(&q->backing_dev_info, bdi_bits);
3351 if (bdi_bits & (1 << BDI_async_congested) && test_bit(NET_CONGESTED, &mdev->flags)) {
3352 r |= (1 << BDI_async_congested);
3353 reason = reason == 'b' ? 'a' : 'n';
3357 mdev->congestion_reason = reason;
3361 struct drbd_conf *drbd_new_device(unsigned int minor)
3363 struct drbd_conf *mdev;
3364 struct gendisk *disk;
3365 struct request_queue *q;
3367 /* GFP_KERNEL, we are outside of all write-out paths */
3368 mdev = kzalloc(sizeof(struct drbd_conf), GFP_KERNEL);
3371 if (!zalloc_cpumask_var(&mdev->cpu_mask, GFP_KERNEL))
3372 goto out_no_cpumask;
3374 mdev->minor = minor;
3376 drbd_init_set_defaults(mdev);
3378 q = blk_alloc_queue(GFP_KERNEL);
3382 q->queuedata = mdev;
3384 disk = alloc_disk(1);
3389 set_disk_ro(disk, true);
3392 disk->major = DRBD_MAJOR;
3393 disk->first_minor = minor;
3394 disk->fops = &drbd_ops;
3395 sprintf(disk->disk_name, "drbd%d", minor);
3396 disk->private_data = mdev;
3398 mdev->this_bdev = bdget(MKDEV(DRBD_MAJOR, minor));
3399 /* we have no partitions. we contain only ourselves. */
3400 mdev->this_bdev->bd_contains = mdev->this_bdev;
3402 q->backing_dev_info.congested_fn = drbd_congested;
3403 q->backing_dev_info.congested_data = mdev;
3405 blk_queue_make_request(q, drbd_make_request);
3406 blk_queue_max_hw_sectors(q, DRBD_MAX_BIO_SIZE >> 9);
3407 blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
3408 blk_queue_merge_bvec(q, drbd_merge_bvec);
3409 q->queue_lock = &mdev->req_lock;
3411 mdev->md_io_page = alloc_page(GFP_KERNEL);
3412 if (!mdev->md_io_page)
3413 goto out_no_io_page;
3415 if (drbd_bm_init(mdev))
3417 /* no need to lock access, we are still initializing this minor device. */
3421 mdev->app_reads_hash = kzalloc(APP_R_HSIZE*sizeof(void *), GFP_KERNEL);
3422 if (!mdev->app_reads_hash)
3423 goto out_no_app_reads;
3425 mdev->current_epoch = kzalloc(sizeof(struct drbd_epoch), GFP_KERNEL);
3426 if (!mdev->current_epoch)
3429 INIT_LIST_HEAD(&mdev->current_epoch->list);
3434 /* out_whatever_else:
3435 kfree(mdev->current_epoch); */
3437 kfree(mdev->app_reads_hash);
3441 drbd_bm_cleanup(mdev);
3443 __free_page(mdev->md_io_page);
3447 blk_cleanup_queue(q);
3449 free_cpumask_var(mdev->cpu_mask);
3455 /* counterpart of drbd_new_device.
3456 * last part of drbd_delete_device. */
3457 void drbd_free_mdev(struct drbd_conf *mdev)
3459 kfree(mdev->current_epoch);
3460 kfree(mdev->app_reads_hash);
3462 if (mdev->bitmap) /* should no longer be there. */
3463 drbd_bm_cleanup(mdev);
3464 __free_page(mdev->md_io_page);
3465 put_disk(mdev->vdisk);
3466 blk_cleanup_queue(mdev->rq_queue);
3467 free_cpumask_var(mdev->cpu_mask);
3468 drbd_free_tl_hash(mdev);
3473 int __init drbd_init(void)
3477 if (sizeof(struct p_handshake) != 80) {
3479 "drbd: never change the size or layout "
3480 "of the HandShake packet.\n");
3484 if (minor_count < DRBD_MINOR_COUNT_MIN || minor_count > DRBD_MINOR_COUNT_MAX) {
3486 "drbd: invalid minor_count (%d)\n", minor_count);
3494 err = drbd_nl_init();
3498 err = register_blkdev(DRBD_MAJOR, "drbd");
3501 "drbd: unable to register block device major %d\n",
3506 register_reboot_notifier(&drbd_notifier);
3509 * allocate all necessary structs
3513 init_waitqueue_head(&drbd_pp_wait);
3515 drbd_proc = NULL; /* play safe for drbd_cleanup */
3516 minor_table = kzalloc(sizeof(struct drbd_conf *)*minor_count,
3521 err = drbd_create_mempools();
3525 drbd_proc = proc_create_data("drbd", S_IFREG | S_IRUGO , NULL, &drbd_proc_fops, NULL);
3527 printk(KERN_ERR "drbd: unable to register proc file\n");
3531 rwlock_init(&global_state_lock);
3533 printk(KERN_INFO "drbd: initialized. "
3534 "Version: " REL_VERSION " (api:%d/proto:%d-%d)\n",
3535 API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX);
3536 printk(KERN_INFO "drbd: %s\n", drbd_buildtag());
3537 printk(KERN_INFO "drbd: registered as block device major %d\n",
3539 printk(KERN_INFO "drbd: minor_table @ 0x%p\n", minor_table);
3541 return 0; /* Success! */
3546 /* currently always the case */
3547 printk(KERN_ERR "drbd: ran out of memory\n");
3549 printk(KERN_ERR "drbd: initialization failure\n");
3553 void drbd_free_bc(struct drbd_backing_dev *ldev)
3558 blkdev_put(ldev->backing_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
3559 blkdev_put(ldev->md_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
3564 void drbd_free_sock(struct drbd_conf *mdev)
3566 if (mdev->data.socket) {
3567 mutex_lock(&mdev->data.mutex);
3568 kernel_sock_shutdown(mdev->data.socket, SHUT_RDWR);
3569 sock_release(mdev->data.socket);
3570 mdev->data.socket = NULL;
3571 mutex_unlock(&mdev->data.mutex);
3573 if (mdev->meta.socket) {
3574 mutex_lock(&mdev->meta.mutex);
3575 kernel_sock_shutdown(mdev->meta.socket, SHUT_RDWR);
3576 sock_release(mdev->meta.socket);
3577 mdev->meta.socket = NULL;
3578 mutex_unlock(&mdev->meta.mutex);
3583 void drbd_free_resources(struct drbd_conf *mdev)
3585 crypto_free_hash(mdev->csums_tfm);
3586 mdev->csums_tfm = NULL;
3587 crypto_free_hash(mdev->verify_tfm);
3588 mdev->verify_tfm = NULL;
3589 crypto_free_hash(mdev->cram_hmac_tfm);
3590 mdev->cram_hmac_tfm = NULL;
3591 crypto_free_hash(mdev->integrity_w_tfm);
3592 mdev->integrity_w_tfm = NULL;
3593 crypto_free_hash(mdev->integrity_r_tfm);
3594 mdev->integrity_r_tfm = NULL;
3596 drbd_free_sock(mdev);
3599 drbd_free_bc(mdev->ldev);
3600 mdev->ldev = NULL;);
3603 /* meta data management */
3605 struct meta_data_on_disk {
3606 u64 la_size; /* last agreed size. */
3607 u64 uuid[UI_SIZE]; /* UUIDs. */
3610 u32 flags; /* MDF */
3613 u32 al_offset; /* offset to this block */
3614 u32 al_nr_extents; /* important for restoring the AL */
3615 /* `-- act_log->nr_elements <-- sync_conf.al_extents */
3616 u32 bm_offset; /* offset to the bitmap, from here */
3617 u32 bm_bytes_per_bit; /* BM_BLOCK_SIZE */
3618 u32 reserved_u32[4];
3623 * drbd_md_sync() - Writes the meta data super block if the MD_DIRTY flag bit is set
3624 * @mdev: DRBD device.
3626 void drbd_md_sync(struct drbd_conf *mdev)
3628 struct meta_data_on_disk *buffer;
3632 del_timer(&mdev->md_sync_timer);
3633 /* timer may be rearmed by drbd_md_mark_dirty() now. */
3634 if (!test_and_clear_bit(MD_DIRTY, &mdev->flags))
3637 /* We use here D_FAILED and not D_ATTACHING because we try to write
3638 * metadata even if we detach due to a disk failure! */
3639 if (!get_ldev_if_state(mdev, D_FAILED))
3642 mutex_lock(&mdev->md_io_mutex);
3643 buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);
3644 memset(buffer, 0, 512);
3646 buffer->la_size = cpu_to_be64(drbd_get_capacity(mdev->this_bdev));
3647 for (i = UI_CURRENT; i < UI_SIZE; i++)
3648 buffer->uuid[i] = cpu_to_be64(mdev->ldev->md.uuid[i]);
3649 buffer->flags = cpu_to_be32(mdev->ldev->md.flags);
3650 buffer->magic = cpu_to_be32(DRBD_MD_MAGIC);
3652 buffer->md_size_sect = cpu_to_be32(mdev->ldev->md.md_size_sect);
3653 buffer->al_offset = cpu_to_be32(mdev->ldev->md.al_offset);
3654 buffer->al_nr_extents = cpu_to_be32(mdev->act_log->nr_elements);
3655 buffer->bm_bytes_per_bit = cpu_to_be32(BM_BLOCK_SIZE);
3656 buffer->device_uuid = cpu_to_be64(mdev->ldev->md.device_uuid);
3658 buffer->bm_offset = cpu_to_be32(mdev->ldev->md.bm_offset);
3660 D_ASSERT(drbd_md_ss__(mdev, mdev->ldev) == mdev->ldev->md.md_offset);
3661 sector = mdev->ldev->md.md_offset;
3663 if (!drbd_md_sync_page_io(mdev, mdev->ldev, sector, WRITE)) {
3664 /* this was a try anyways ... */
3665 dev_err(DEV, "meta data update failed!\n");
3666 drbd_chk_io_error(mdev, 1, true);
3669 /* Update mdev->ldev->md.la_size_sect,
3670 * since we updated it on metadata. */
3671 mdev->ldev->md.la_size_sect = drbd_get_capacity(mdev->this_bdev);
3673 mutex_unlock(&mdev->md_io_mutex);
3678 * drbd_md_read() - Reads in the meta data super block
3679 * @mdev: DRBD device.
3680 * @bdev: Device from which the meta data should be read in.
3682 * Return 0 (NO_ERROR) on success, and an enum drbd_ret_code in case
3683 * something goes wrong. Currently only: ERR_IO_MD_DISK, ERR_MD_INVALID.
3685 int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
3687 struct meta_data_on_disk *buffer;
3688 int i, rv = NO_ERROR;
3690 if (!get_ldev_if_state(mdev, D_ATTACHING))
3691 return ERR_IO_MD_DISK;
3693 mutex_lock(&mdev->md_io_mutex);
3694 buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);
3696 if (!drbd_md_sync_page_io(mdev, bdev, bdev->md.md_offset, READ)) {
3697 /* NOTE: cant do normal error processing here as this is
3698 called BEFORE disk is attached */
3699 dev_err(DEV, "Error while reading metadata.\n");
3700 rv = ERR_IO_MD_DISK;
3704 if (be32_to_cpu(buffer->magic) != DRBD_MD_MAGIC) {
3705 dev_err(DEV, "Error while reading metadata, magic not found.\n");
3706 rv = ERR_MD_INVALID;
3709 if (be32_to_cpu(buffer->al_offset) != bdev->md.al_offset) {
3710 dev_err(DEV, "unexpected al_offset: %d (expected %d)\n",
3711 be32_to_cpu(buffer->al_offset), bdev->md.al_offset);
3712 rv = ERR_MD_INVALID;
3715 if (be32_to_cpu(buffer->bm_offset) != bdev->md.bm_offset) {
3716 dev_err(DEV, "unexpected bm_offset: %d (expected %d)\n",
3717 be32_to_cpu(buffer->bm_offset), bdev->md.bm_offset);
3718 rv = ERR_MD_INVALID;
3721 if (be32_to_cpu(buffer->md_size_sect) != bdev->md.md_size_sect) {
3722 dev_err(DEV, "unexpected md_size: %u (expected %u)\n",
3723 be32_to_cpu(buffer->md_size_sect), bdev->md.md_size_sect);
3724 rv = ERR_MD_INVALID;
3728 if (be32_to_cpu(buffer->bm_bytes_per_bit) != BM_BLOCK_SIZE) {
3729 dev_err(DEV, "unexpected bm_bytes_per_bit: %u (expected %u)\n",
3730 be32_to_cpu(buffer->bm_bytes_per_bit), BM_BLOCK_SIZE);
3731 rv = ERR_MD_INVALID;
3735 bdev->md.la_size_sect = be64_to_cpu(buffer->la_size);
3736 for (i = UI_CURRENT; i < UI_SIZE; i++)
3737 bdev->md.uuid[i] = be64_to_cpu(buffer->uuid[i]);
3738 bdev->md.flags = be32_to_cpu(buffer->flags);
3739 mdev->sync_conf.al_extents = be32_to_cpu(buffer->al_nr_extents);
3740 bdev->md.device_uuid = be64_to_cpu(buffer->device_uuid);
3742 if (mdev->sync_conf.al_extents < 7)
3743 mdev->sync_conf.al_extents = 127;
3746 mutex_unlock(&mdev->md_io_mutex);
3752 static void debug_drbd_uuid(struct drbd_conf *mdev, enum drbd_uuid_index index)
3754 static char *uuid_str[UI_EXTENDED_SIZE] = {
3755 [UI_CURRENT] = "CURRENT",
3756 [UI_BITMAP] = "BITMAP",
3757 [UI_HISTORY_START] = "HISTORY_START",
3758 [UI_HISTORY_END] = "HISTORY_END",
3760 [UI_FLAGS] = "FLAGS",
3763 if (index >= UI_EXTENDED_SIZE) {
3764 dev_warn(DEV, " uuid_index >= EXTENDED_SIZE\n");
3768 dynamic_dev_dbg(DEV, " uuid[%s] now %016llX\n",
3770 (unsigned long long)mdev->ldev->md.uuid[index]);
3775 * drbd_md_mark_dirty() - Mark meta data super block as dirty
3776 * @mdev: DRBD device.
3778 * Call this function if you change anything that should be written to
3779 * the meta-data super block. This function sets MD_DIRTY, and starts a
3780 * timer that ensures that within five seconds you have to call drbd_md_sync().
3783 void drbd_md_mark_dirty_(struct drbd_conf *mdev, unsigned int line, const char *func)
3785 if (!test_and_set_bit(MD_DIRTY, &mdev->flags)) {
3786 mod_timer(&mdev->md_sync_timer, jiffies + HZ);
3787 mdev->last_md_mark_dirty.line = line;
3788 mdev->last_md_mark_dirty.func = func;
3792 void drbd_md_mark_dirty(struct drbd_conf *mdev)
3794 if (!test_and_set_bit(MD_DIRTY, &mdev->flags))
3795 mod_timer(&mdev->md_sync_timer, jiffies + 5*HZ);
3799 static void drbd_uuid_move_history(struct drbd_conf *mdev) __must_hold(local)
3803 for (i = UI_HISTORY_START; i < UI_HISTORY_END; i++) {
3804 mdev->ldev->md.uuid[i+1] = mdev->ldev->md.uuid[i];
3805 debug_drbd_uuid(mdev, i+1);
3809 void _drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local)
3811 if (idx == UI_CURRENT) {
3812 if (mdev->state.role == R_PRIMARY)
3817 drbd_set_ed_uuid(mdev, val);
3820 mdev->ldev->md.uuid[idx] = val;
3821 debug_drbd_uuid(mdev, idx);
3822 drbd_md_mark_dirty(mdev);
3826 void drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local)
3828 if (mdev->ldev->md.uuid[idx]) {
3829 drbd_uuid_move_history(mdev);
3830 mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[idx];
3831 debug_drbd_uuid(mdev, UI_HISTORY_START);
3833 _drbd_uuid_set(mdev, idx, val);
3837 * drbd_uuid_new_current() - Creates a new current UUID
3838 * @mdev: DRBD device.
3840 * Creates a new current UUID, and rotates the old current UUID into
3841 * the bitmap slot. Causes an incremental resync upon next connect.
3843 void drbd_uuid_new_current(struct drbd_conf *mdev) __must_hold(local)
3847 dev_info(DEV, "Creating new current UUID\n");
3848 D_ASSERT(mdev->ldev->md.uuid[UI_BITMAP] == 0);
3849 mdev->ldev->md.uuid[UI_BITMAP] = mdev->ldev->md.uuid[UI_CURRENT];
3850 debug_drbd_uuid(mdev, UI_BITMAP);
3852 get_random_bytes(&val, sizeof(u64));
3853 _drbd_uuid_set(mdev, UI_CURRENT, val);
3854 /* get it to stable storage _now_ */
3858 void drbd_uuid_set_bm(struct drbd_conf *mdev, u64 val) __must_hold(local)
3860 if (mdev->ldev->md.uuid[UI_BITMAP] == 0 && val == 0)
3864 drbd_uuid_move_history(mdev);
3865 mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[UI_BITMAP];
3866 mdev->ldev->md.uuid[UI_BITMAP] = 0;
3867 debug_drbd_uuid(mdev, UI_HISTORY_START);
3868 debug_drbd_uuid(mdev, UI_BITMAP);
3870 if (mdev->ldev->md.uuid[UI_BITMAP])
3871 dev_warn(DEV, "bm UUID already set");
3873 mdev->ldev->md.uuid[UI_BITMAP] = val;
3874 mdev->ldev->md.uuid[UI_BITMAP] &= ~((u64)1);
3876 debug_drbd_uuid(mdev, UI_BITMAP);
3878 drbd_md_mark_dirty(mdev);
3882 * drbd_bmio_set_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
3883 * @mdev: DRBD device.
3885 * Sets all bits in the bitmap and writes the whole bitmap to stable storage.
3887 int drbd_bmio_set_n_write(struct drbd_conf *mdev)
3891 if (get_ldev_if_state(mdev, D_ATTACHING)) {
3892 drbd_md_set_flag(mdev, MDF_FULL_SYNC);
3894 drbd_bm_set_all(mdev);
3896 rv = drbd_bm_write(mdev);
3899 drbd_md_clear_flag(mdev, MDF_FULL_SYNC);
3910 * drbd_bmio_clear_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
3911 * @mdev: DRBD device.
3913 * Clears all bits in the bitmap and writes the whole bitmap to stable storage.
3915 int drbd_bmio_clear_n_write(struct drbd_conf *mdev)
3919 drbd_resume_al(mdev);
3920 if (get_ldev_if_state(mdev, D_ATTACHING)) {
3921 drbd_bm_clear_all(mdev);
3922 rv = drbd_bm_write(mdev);
3929 static int w_bitmap_io(struct drbd_conf *mdev, struct drbd_work *w, int unused)
3931 struct bm_io_work *work = container_of(w, struct bm_io_work, w);
3934 D_ASSERT(atomic_read(&mdev->ap_bio_cnt) == 0);
3936 if (get_ldev(mdev)) {
3937 drbd_bm_lock(mdev, work->why);
3938 rv = work->io_fn(mdev);
3939 drbd_bm_unlock(mdev);
3943 clear_bit(BITMAP_IO, &mdev->flags);
3944 smp_mb__after_clear_bit();
3945 wake_up(&mdev->misc_wait);
3948 work->done(mdev, rv);
3950 clear_bit(BITMAP_IO_QUEUED, &mdev->flags);
3956 void drbd_ldev_destroy(struct drbd_conf *mdev)
3958 lc_destroy(mdev->resync);
3959 mdev->resync = NULL;
3960 lc_destroy(mdev->act_log);
3961 mdev->act_log = NULL;
3963 drbd_free_bc(mdev->ldev);
3964 mdev->ldev = NULL;);
3966 if (mdev->md_io_tmpp) {
3967 __free_page(mdev->md_io_tmpp);
3968 mdev->md_io_tmpp = NULL;
3970 clear_bit(GO_DISKLESS, &mdev->flags);
3973 static int w_go_diskless(struct drbd_conf *mdev, struct drbd_work *w, int unused)
3975 D_ASSERT(mdev->state.disk == D_FAILED);
3976 /* we cannot assert local_cnt == 0 here, as get_ldev_if_state will
3977 * inc/dec it frequently. Once we are D_DISKLESS, no one will touch
3978 * the protected members anymore, though, so once put_ldev reaches zero
3979 * again, it will be safe to free them. */
3980 drbd_force_state(mdev, NS(disk, D_DISKLESS));
3984 void drbd_go_diskless(struct drbd_conf *mdev)
3986 D_ASSERT(mdev->state.disk == D_FAILED);
3987 if (!test_and_set_bit(GO_DISKLESS, &mdev->flags))
3988 drbd_queue_work(&mdev->data.work, &mdev->go_diskless);
3992 * drbd_queue_bitmap_io() - Queues an IO operation on the whole bitmap
3993 * @mdev: DRBD device.
3994 * @io_fn: IO callback to be called when bitmap IO is possible
3995 * @done: callback to be called after the bitmap IO was performed
3996 * @why: Descriptive text of the reason for doing the IO
3998 * While IO on the bitmap happens we freeze application IO thus we ensure
3999 * that drbd_set_out_of_sync() can not be called. This function MAY ONLY be
4000 * called from worker context. It MUST NOT be used while a previous such
4001 * work is still pending!
4003 void drbd_queue_bitmap_io(struct drbd_conf *mdev,
4004 int (*io_fn)(struct drbd_conf *),
4005 void (*done)(struct drbd_conf *, int),
4008 D_ASSERT(current == mdev->worker.task);
4010 D_ASSERT(!test_bit(BITMAP_IO_QUEUED, &mdev->flags));
4011 D_ASSERT(!test_bit(BITMAP_IO, &mdev->flags));
4012 D_ASSERT(list_empty(&mdev->bm_io_work.w.list));
4013 if (mdev->bm_io_work.why)
4014 dev_err(DEV, "FIXME going to queue '%s' but '%s' still pending?\n",
4015 why, mdev->bm_io_work.why);
4017 mdev->bm_io_work.io_fn = io_fn;
4018 mdev->bm_io_work.done = done;
4019 mdev->bm_io_work.why = why;
4021 spin_lock_irq(&mdev->req_lock);
4022 set_bit(BITMAP_IO, &mdev->flags);
4023 if (atomic_read(&mdev->ap_bio_cnt) == 0) {
4024 if (!test_and_set_bit(BITMAP_IO_QUEUED, &mdev->flags))
4025 drbd_queue_work(&mdev->data.work, &mdev->bm_io_work.w);
4027 spin_unlock_irq(&mdev->req_lock);
4031 * drbd_bitmap_io() - Does an IO operation on the whole bitmap
4032 * @mdev: DRBD device.
4033 * @io_fn: IO callback to be called when bitmap IO is possible
4034 * @why: Descriptive text of the reason for doing the IO
4036 * freezes application IO while that the actual IO operations runs. This
4037 * functions MAY NOT be called from worker context.
4039 int drbd_bitmap_io(struct drbd_conf *mdev, int (*io_fn)(struct drbd_conf *), char *why)
4043 D_ASSERT(current != mdev->worker.task);
4045 drbd_suspend_io(mdev);
4047 drbd_bm_lock(mdev, why);
4049 drbd_bm_unlock(mdev);
4051 drbd_resume_io(mdev);
4056 void drbd_md_set_flag(struct drbd_conf *mdev, int flag) __must_hold(local)
4058 if ((mdev->ldev->md.flags & flag) != flag) {
4059 drbd_md_mark_dirty(mdev);
4060 mdev->ldev->md.flags |= flag;
4064 void drbd_md_clear_flag(struct drbd_conf *mdev, int flag) __must_hold(local)
4066 if ((mdev->ldev->md.flags & flag) != 0) {
4067 drbd_md_mark_dirty(mdev);
4068 mdev->ldev->md.flags &= ~flag;
4071 int drbd_md_test_flag(struct drbd_backing_dev *bdev, int flag)
4073 return (bdev->md.flags & flag) != 0;
4076 static void md_sync_timer_fn(unsigned long data)
4078 struct drbd_conf *mdev = (struct drbd_conf *) data;
4080 drbd_queue_work_front(&mdev->data.work, &mdev->md_sync_work);
4083 static int w_md_sync(struct drbd_conf *mdev, struct drbd_work *w, int unused)
4085 dev_warn(DEV, "md_sync_timer expired! Worker calls drbd_md_sync().\n");
4087 dev_warn(DEV, "last md_mark_dirty: %s:%u\n",
4088 mdev->last_md_mark_dirty.func, mdev->last_md_mark_dirty.line);
4094 #ifdef CONFIG_DRBD_FAULT_INJECTION
4095 /* Fault insertion support including random number generator shamelessly
4096 * stolen from kernel/rcutorture.c */
4097 struct fault_random_state {
4098 unsigned long state;
4099 unsigned long count;
4102 #define FAULT_RANDOM_MULT 39916801 /* prime */
4103 #define FAULT_RANDOM_ADD 479001701 /* prime */
4104 #define FAULT_RANDOM_REFRESH 10000
4107 * Crude but fast random-number generator. Uses a linear congruential
4108 * generator, with occasional help from get_random_bytes().
4110 static unsigned long
4111 _drbd_fault_random(struct fault_random_state *rsp)
4115 if (!rsp->count--) {
4116 get_random_bytes(&refresh, sizeof(refresh));
4117 rsp->state += refresh;
4118 rsp->count = FAULT_RANDOM_REFRESH;
4120 rsp->state = rsp->state * FAULT_RANDOM_MULT + FAULT_RANDOM_ADD;
4121 return swahw32(rsp->state);
4125 _drbd_fault_str(unsigned int type) {
4126 static char *_faults[] = {
4127 [DRBD_FAULT_MD_WR] = "Meta-data write",
4128 [DRBD_FAULT_MD_RD] = "Meta-data read",
4129 [DRBD_FAULT_RS_WR] = "Resync write",
4130 [DRBD_FAULT_RS_RD] = "Resync read",
4131 [DRBD_FAULT_DT_WR] = "Data write",
4132 [DRBD_FAULT_DT_RD] = "Data read",
4133 [DRBD_FAULT_DT_RA] = "Data read ahead",
4134 [DRBD_FAULT_BM_ALLOC] = "BM allocation",
4135 [DRBD_FAULT_AL_EE] = "EE allocation",
4136 [DRBD_FAULT_RECEIVE] = "receive data corruption",
4139 return (type < DRBD_FAULT_MAX) ? _faults[type] : "**Unknown**";
4143 _drbd_insert_fault(struct drbd_conf *mdev, unsigned int type)
4145 static struct fault_random_state rrs = {0, 0};
4147 unsigned int ret = (
4149 ((1 << mdev_to_minor(mdev)) & fault_devs) != 0) &&
4150 (((_drbd_fault_random(&rrs) % 100) + 1) <= fault_rate));
4155 if (__ratelimit(&drbd_ratelimit_state))
4156 dev_warn(DEV, "***Simulating %s failure\n",
4157 _drbd_fault_str(type));
4164 const char *drbd_buildtag(void)
4166 /* DRBD built from external sources has here a reference to the
4167 git hash of the source code. */
4169 static char buildtag[38] = "\0uilt-in";
4171 if (buildtag[0] == 0) {
4172 #ifdef CONFIG_MODULES
4173 if (THIS_MODULE != NULL)
4174 sprintf(buildtag, "srcversion: %-24s", THIS_MODULE->srcversion);
4183 module_init(drbd_init)
4184 module_exit(drbd_cleanup)
4186 EXPORT_SYMBOL(drbd_conn_str);
4187 EXPORT_SYMBOL(drbd_role_str);
4188 EXPORT_SYMBOL(drbd_disk_str);
4189 EXPORT_SYMBOL(drbd_set_st_err_str);