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);
1163 if (os.disk == D_ATTACHING && ns.disk >= D_NEGOTIATING)
1164 drbd_print_uuids(mdev, "attached to UUIDs");
1166 wake_up(&mdev->misc_wait);
1167 wake_up(&mdev->state_wait);
1169 /* aborted verify run. log the last position */
1170 if ((os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) &&
1171 ns.conn < C_CONNECTED) {
1172 mdev->ov_start_sector =
1173 BM_BIT_TO_SECT(drbd_bm_bits(mdev) - mdev->ov_left);
1174 dev_info(DEV, "Online Verify reached sector %llu\n",
1175 (unsigned long long)mdev->ov_start_sector);
1178 if ((os.conn == C_PAUSED_SYNC_T || os.conn == C_PAUSED_SYNC_S) &&
1179 (ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)) {
1180 dev_info(DEV, "Syncer continues.\n");
1181 mdev->rs_paused += (long)jiffies
1182 -(long)mdev->rs_mark_time[mdev->rs_last_mark];
1183 if (ns.conn == C_SYNC_TARGET)
1184 mod_timer(&mdev->resync_timer, jiffies);
1187 if ((os.conn == C_SYNC_TARGET || os.conn == C_SYNC_SOURCE) &&
1188 (ns.conn == C_PAUSED_SYNC_T || ns.conn == C_PAUSED_SYNC_S)) {
1189 dev_info(DEV, "Resync suspended\n");
1190 mdev->rs_mark_time[mdev->rs_last_mark] = jiffies;
1193 if (os.conn == C_CONNECTED &&
1194 (ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T)) {
1195 unsigned long now = jiffies;
1198 set_ov_position(mdev, ns.conn);
1199 mdev->rs_start = now;
1200 mdev->rs_last_events = 0;
1201 mdev->rs_last_sect_ev = 0;
1202 mdev->ov_last_oos_size = 0;
1203 mdev->ov_last_oos_start = 0;
1205 for (i = 0; i < DRBD_SYNC_MARKS; i++) {
1206 mdev->rs_mark_left[i] = mdev->ov_left;
1207 mdev->rs_mark_time[i] = now;
1210 drbd_rs_controller_reset(mdev);
1212 if (ns.conn == C_VERIFY_S) {
1213 dev_info(DEV, "Starting Online Verify from sector %llu\n",
1214 (unsigned long long)mdev->ov_position);
1215 mod_timer(&mdev->resync_timer, jiffies);
1219 if (get_ldev(mdev)) {
1220 u32 mdf = mdev->ldev->md.flags & ~(MDF_CONSISTENT|MDF_PRIMARY_IND|
1221 MDF_CONNECTED_IND|MDF_WAS_UP_TO_DATE|
1222 MDF_PEER_OUT_DATED|MDF_CRASHED_PRIMARY);
1224 if (test_bit(CRASHED_PRIMARY, &mdev->flags))
1225 mdf |= MDF_CRASHED_PRIMARY;
1226 if (mdev->state.role == R_PRIMARY ||
1227 (mdev->state.pdsk < D_INCONSISTENT && mdev->state.peer == R_PRIMARY))
1228 mdf |= MDF_PRIMARY_IND;
1229 if (mdev->state.conn > C_WF_REPORT_PARAMS)
1230 mdf |= MDF_CONNECTED_IND;
1231 if (mdev->state.disk > D_INCONSISTENT)
1232 mdf |= MDF_CONSISTENT;
1233 if (mdev->state.disk > D_OUTDATED)
1234 mdf |= MDF_WAS_UP_TO_DATE;
1235 if (mdev->state.pdsk <= D_OUTDATED && mdev->state.pdsk >= D_INCONSISTENT)
1236 mdf |= MDF_PEER_OUT_DATED;
1237 if (mdf != mdev->ldev->md.flags) {
1238 mdev->ldev->md.flags = mdf;
1239 drbd_md_mark_dirty(mdev);
1241 if (os.disk < D_CONSISTENT && ns.disk >= D_CONSISTENT)
1242 drbd_set_ed_uuid(mdev, mdev->ldev->md.uuid[UI_CURRENT]);
1246 /* Peer was forced D_UP_TO_DATE & R_PRIMARY, consider to resync */
1247 if (os.disk == D_INCONSISTENT && os.pdsk == D_INCONSISTENT &&
1248 os.peer == R_SECONDARY && ns.peer == R_PRIMARY)
1249 set_bit(CONSIDER_RESYNC, &mdev->flags);
1251 /* Receiver should clean up itself */
1252 if (os.conn != C_DISCONNECTING && ns.conn == C_DISCONNECTING)
1253 drbd_thread_stop_nowait(&mdev->receiver);
1255 /* Now the receiver finished cleaning up itself, it should die */
1256 if (os.conn != C_STANDALONE && ns.conn == C_STANDALONE)
1257 drbd_thread_stop_nowait(&mdev->receiver);
1259 /* Upon network failure, we need to restart the receiver. */
1260 if (os.conn > C_TEAR_DOWN &&
1261 ns.conn <= C_TEAR_DOWN && ns.conn >= C_TIMEOUT)
1262 drbd_thread_restart_nowait(&mdev->receiver);
1264 /* Resume AL writing if we get a connection */
1265 if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED)
1266 drbd_resume_al(mdev);
1268 /* Start a new epoch in case we start to mirror write requests */
1269 if (!drbd_should_do_remote(os) && drbd_should_do_remote(ns))
1272 /* Do not add local-only requests to an epoch with mirrored requests */
1273 if (drbd_should_do_remote(os) && !drbd_should_do_remote(ns))
1274 set_bit(CREATE_BARRIER, &mdev->flags);
1276 ascw = kmalloc(sizeof(*ascw), GFP_ATOMIC);
1280 ascw->flags = flags;
1281 ascw->w.cb = w_after_state_ch;
1283 drbd_queue_work(&mdev->data.work, &ascw->w);
1285 dev_warn(DEV, "Could not kmalloc an ascw\n");
1291 static int w_after_state_ch(struct drbd_conf *mdev, struct drbd_work *w, int unused)
1293 struct after_state_chg_work *ascw =
1294 container_of(w, struct after_state_chg_work, w);
1295 after_state_ch(mdev, ascw->os, ascw->ns, ascw->flags);
1296 if (ascw->flags & CS_WAIT_COMPLETE) {
1297 D_ASSERT(ascw->done != NULL);
1298 complete(ascw->done);
1305 static void abw_start_sync(struct drbd_conf *mdev, int rv)
1308 dev_err(DEV, "Writing the bitmap failed not starting resync.\n");
1309 _drbd_request_state(mdev, NS(conn, C_CONNECTED), CS_VERBOSE);
1313 switch (mdev->state.conn) {
1314 case C_STARTING_SYNC_T:
1315 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE);
1317 case C_STARTING_SYNC_S:
1318 drbd_start_resync(mdev, C_SYNC_SOURCE);
1323 int drbd_bitmap_io_from_worker(struct drbd_conf *mdev, int (*io_fn)(struct drbd_conf *), char *why)
1327 D_ASSERT(current == mdev->worker.task);
1329 /* open coded non-blocking drbd_suspend_io(mdev); */
1330 set_bit(SUSPEND_IO, &mdev->flags);
1331 if (!is_susp(mdev->state))
1332 D_ASSERT(atomic_read(&mdev->ap_bio_cnt) == 0);
1334 drbd_bm_lock(mdev, why);
1336 drbd_bm_unlock(mdev);
1338 drbd_resume_io(mdev);
1344 * after_state_ch() - Perform after state change actions that may sleep
1345 * @mdev: DRBD device.
1350 static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
1351 union drbd_state ns, enum chg_state_flags flags)
1353 enum drbd_fencing_p fp;
1354 enum drbd_req_event what = nothing;
1355 union drbd_state nsm = (union drbd_state){ .i = -1 };
1357 if (os.conn != C_CONNECTED && ns.conn == C_CONNECTED) {
1358 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1360 mdev->p_uuid[UI_FLAGS] &= ~((u64)2);
1364 if (get_ldev(mdev)) {
1365 fp = mdev->ldev->dc.fencing;
1369 /* Inform userspace about the change... */
1370 drbd_bcast_state(mdev, ns);
1372 if (!(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE) &&
1373 (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE))
1374 drbd_khelper(mdev, "pri-on-incon-degr");
1376 /* Here we have the actions that are performed after a
1377 state change. This function might sleep */
1381 if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED)
1384 if (os.disk == D_ATTACHING && ns.disk > D_ATTACHING)
1385 what = restart_frozen_disk_io;
1387 if (what != nothing)
1392 /* case1: The outdate peer handler is successful: */
1393 if (os.pdsk > D_OUTDATED && ns.pdsk <= D_OUTDATED) {
1395 if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
1396 drbd_uuid_new_current(mdev);
1397 clear_bit(NEW_CUR_UUID, &mdev->flags);
1399 spin_lock_irq(&mdev->req_lock);
1400 _drbd_set_state(_NS(mdev, susp_fen, 0), CS_VERBOSE, NULL);
1401 spin_unlock_irq(&mdev->req_lock);
1403 /* case2: The connection was established again: */
1404 if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) {
1405 clear_bit(NEW_CUR_UUID, &mdev->flags);
1411 if (what != nothing) {
1412 spin_lock_irq(&mdev->req_lock);
1413 _tl_restart(mdev, what);
1414 nsm.i &= mdev->state.i;
1415 _drbd_set_state(mdev, nsm, CS_VERBOSE, NULL);
1416 spin_unlock_irq(&mdev->req_lock);
1419 /* Became sync source. With protocol >= 96, we still need to send out
1420 * the sync uuid now. Need to do that before any drbd_send_state, or
1421 * the other side may go "paused sync" before receiving the sync uuids,
1422 * which is unexpected. */
1423 if ((os.conn != C_SYNC_SOURCE && os.conn != C_PAUSED_SYNC_S) &&
1424 (ns.conn == C_SYNC_SOURCE || ns.conn == C_PAUSED_SYNC_S) &&
1425 mdev->agreed_pro_version >= 96 && get_ldev(mdev)) {
1426 drbd_gen_and_send_sync_uuid(mdev);
1430 /* Do not change the order of the if above and the two below... */
1431 if (os.pdsk == D_DISKLESS && ns.pdsk > D_DISKLESS) { /* attach on the peer */
1432 drbd_send_uuids(mdev);
1433 drbd_send_state(mdev);
1435 /* No point in queuing send_bitmap if we don't have a connection
1436 * anymore, so check also the _current_ state, not only the new state
1437 * at the time this work was queued. */
1438 if (os.conn != C_WF_BITMAP_S && ns.conn == C_WF_BITMAP_S &&
1439 mdev->state.conn == C_WF_BITMAP_S)
1440 drbd_queue_bitmap_io(mdev, &drbd_send_bitmap, NULL,
1441 "send_bitmap (WFBitMapS)");
1443 /* Lost contact to peer's copy of the data */
1444 if ((os.pdsk >= D_INCONSISTENT &&
1445 os.pdsk != D_UNKNOWN &&
1446 os.pdsk != D_OUTDATED)
1447 && (ns.pdsk < D_INCONSISTENT ||
1448 ns.pdsk == D_UNKNOWN ||
1449 ns.pdsk == D_OUTDATED)) {
1450 if (get_ldev(mdev)) {
1451 if ((ns.role == R_PRIMARY || ns.peer == R_PRIMARY) &&
1452 mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) {
1453 if (is_susp(mdev->state)) {
1454 set_bit(NEW_CUR_UUID, &mdev->flags);
1456 drbd_uuid_new_current(mdev);
1457 drbd_send_uuids(mdev);
1464 if (ns.pdsk < D_INCONSISTENT && get_ldev(mdev)) {
1465 if (ns.peer == R_PRIMARY && mdev->ldev->md.uuid[UI_BITMAP] == 0) {
1466 drbd_uuid_new_current(mdev);
1467 drbd_send_uuids(mdev);
1470 /* D_DISKLESS Peer becomes secondary */
1471 if (os.peer == R_PRIMARY && ns.peer == R_SECONDARY)
1472 drbd_bitmap_io_from_worker(mdev, &drbd_bm_write, "demote diskless peer");
1476 /* Write out all changed bits on demote.
1477 * Though, no need to da that just yet
1478 * if there is a resync going on still */
1479 if (os.role == R_PRIMARY && ns.role == R_SECONDARY &&
1480 mdev->state.conn <= C_CONNECTED && get_ldev(mdev)) {
1481 drbd_bitmap_io_from_worker(mdev, &drbd_bm_write, "demote");
1485 /* Last part of the attaching process ... */
1486 if (ns.conn >= C_CONNECTED &&
1487 os.disk == D_ATTACHING && ns.disk == D_NEGOTIATING) {
1488 drbd_send_sizes(mdev, 0, 0); /* to start sync... */
1489 drbd_send_uuids(mdev);
1490 drbd_send_state(mdev);
1493 /* We want to pause/continue resync, tell peer. */
1494 if (ns.conn >= C_CONNECTED &&
1495 ((os.aftr_isp != ns.aftr_isp) ||
1496 (os.user_isp != ns.user_isp)))
1497 drbd_send_state(mdev);
1499 /* In case one of the isp bits got set, suspend other devices. */
1500 if ((!os.aftr_isp && !os.peer_isp && !os.user_isp) &&
1501 (ns.aftr_isp || ns.peer_isp || ns.user_isp))
1502 suspend_other_sg(mdev);
1504 /* Make sure the peer gets informed about eventual state
1505 changes (ISP bits) while we were in WFReportParams. */
1506 if (os.conn == C_WF_REPORT_PARAMS && ns.conn >= C_CONNECTED)
1507 drbd_send_state(mdev);
1509 if (os.conn != C_AHEAD && ns.conn == C_AHEAD)
1510 drbd_send_state(mdev);
1512 /* We are in the progress to start a full sync... */
1513 if ((os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) ||
1514 (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S))
1515 drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, &abw_start_sync, "set_n_write from StartingSync");
1517 /* We are invalidating our self... */
1518 if (os.conn < C_CONNECTED && ns.conn < C_CONNECTED &&
1519 os.disk > D_INCONSISTENT && ns.disk == D_INCONSISTENT)
1520 drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, NULL, "set_n_write from invalidate");
1522 /* first half of local IO error, failure to attach,
1523 * or administrative detach */
1524 if (os.disk != D_FAILED && ns.disk == D_FAILED) {
1525 enum drbd_io_error_p eh;
1527 /* corresponding get_ldev was in __drbd_set_state, to serialize
1528 * our cleanup here with the transition to D_DISKLESS,
1529 * so it is safe to dreference ldev here. */
1530 eh = mdev->ldev->dc.on_io_error;
1531 was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags);
1533 /* current state still has to be D_FAILED,
1534 * there is only one way out: to D_DISKLESS,
1535 * and that may only happen after our put_ldev below. */
1536 if (mdev->state.disk != D_FAILED)
1538 "ASSERT FAILED: disk is %s during detach\n",
1539 drbd_disk_str(mdev->state.disk));
1541 if (drbd_send_state(mdev))
1542 dev_warn(DEV, "Notified peer that I am detaching my disk\n");
1544 dev_err(DEV, "Sending state for detaching disk failed\n");
1546 drbd_rs_cancel_all(mdev);
1548 /* In case we want to get something to stable storage still,
1549 * this may be the last chance.
1550 * Following put_ldev may transition to D_DISKLESS. */
1554 if (was_io_error && eh == EP_CALL_HELPER)
1555 drbd_khelper(mdev, "local-io-error");
1558 /* second half of local IO error, failure to attach,
1559 * or administrative detach,
1560 * after local_cnt references have reached zero again */
1561 if (os.disk != D_DISKLESS && ns.disk == D_DISKLESS) {
1562 /* We must still be diskless,
1563 * re-attach has to be serialized with this! */
1564 if (mdev->state.disk != D_DISKLESS)
1566 "ASSERT FAILED: disk is %s while going diskless\n",
1567 drbd_disk_str(mdev->state.disk));
1570 mdev->rs_failed = 0;
1571 atomic_set(&mdev->rs_pending_cnt, 0);
1573 if (drbd_send_state(mdev))
1574 dev_warn(DEV, "Notified peer that I'm now diskless.\n");
1576 dev_err(DEV, "Sending state for being diskless failed\n");
1577 /* corresponding get_ldev in __drbd_set_state
1578 * this may finaly trigger drbd_ldev_destroy. */
1582 /* Disks got bigger while they were detached */
1583 if (ns.disk > D_NEGOTIATING && ns.pdsk > D_NEGOTIATING &&
1584 test_and_clear_bit(RESYNC_AFTER_NEG, &mdev->flags)) {
1585 if (ns.conn == C_CONNECTED)
1586 resync_after_online_grow(mdev);
1589 /* A resync finished or aborted, wake paused devices... */
1590 if ((os.conn > C_CONNECTED && ns.conn <= C_CONNECTED) ||
1591 (os.peer_isp && !ns.peer_isp) ||
1592 (os.user_isp && !ns.user_isp))
1593 resume_next_sg(mdev);
1595 /* sync target done with resync. Explicitly notify peer, even though
1596 * it should (at least for non-empty resyncs) already know itself. */
1597 if (os.disk < D_UP_TO_DATE && os.conn >= C_SYNC_SOURCE && ns.conn == C_CONNECTED)
1598 drbd_send_state(mdev);
1600 /* This triggers bitmap writeout of potentially still unwritten pages
1601 * if the resync finished cleanly, or aborted because of peer disk
1602 * failure. Resync aborted because of connection failure does bitmap
1603 * writeout from drbd_disconnect.
1604 * For resync aborted because of local disk failure, we cannot do
1605 * any bitmap writeout anymore.
1607 if (os.conn > C_CONNECTED && ns.conn == C_CONNECTED &&
1608 mdev->state.conn == C_CONNECTED && get_ldev(mdev)) {
1609 drbd_queue_bitmap_io(mdev, &drbd_bm_write, NULL, "write from resync_finished");
1613 /* free tl_hash if we Got thawed and are C_STANDALONE */
1614 if (ns.conn == C_STANDALONE && !is_susp(ns) && mdev->tl_hash)
1615 drbd_free_tl_hash(mdev);
1617 /* Upon network connection, we need to start the receiver */
1618 if (os.conn == C_STANDALONE && ns.conn == C_UNCONNECTED)
1619 drbd_thread_start(&mdev->receiver);
1621 /* Terminate worker thread if we are unconfigured - it will be
1622 restarted as needed... */
1623 if (ns.disk == D_DISKLESS &&
1624 ns.conn == C_STANDALONE &&
1625 ns.role == R_SECONDARY) {
1626 if (os.aftr_isp != ns.aftr_isp)
1627 resume_next_sg(mdev);
1628 /* set in __drbd_set_state, unless CONFIG_PENDING was set */
1629 if (test_bit(DEVICE_DYING, &mdev->flags))
1630 drbd_thread_stop_nowait(&mdev->worker);
1637 static int drbd_thread_setup(void *arg)
1639 struct drbd_thread *thi = (struct drbd_thread *) arg;
1640 struct drbd_conf *mdev = thi->mdev;
1641 unsigned long flags;
1645 retval = thi->function(thi);
1647 spin_lock_irqsave(&thi->t_lock, flags);
1649 /* if the receiver has been "Exiting", the last thing it did
1650 * was set the conn state to "StandAlone",
1651 * if now a re-connect request comes in, conn state goes C_UNCONNECTED,
1652 * and receiver thread will be "started".
1653 * drbd_thread_start needs to set "Restarting" in that case.
1654 * t_state check and assignment needs to be within the same spinlock,
1655 * so either thread_start sees Exiting, and can remap to Restarting,
1656 * or thread_start see None, and can proceed as normal.
1659 if (thi->t_state == Restarting) {
1660 dev_info(DEV, "Restarting %s\n", current->comm);
1661 thi->t_state = Running;
1662 spin_unlock_irqrestore(&thi->t_lock, flags);
1667 thi->t_state = None;
1669 complete(&thi->stop);
1670 spin_unlock_irqrestore(&thi->t_lock, flags);
1672 dev_info(DEV, "Terminating %s\n", current->comm);
1674 /* Release mod reference taken when thread was started */
1675 module_put(THIS_MODULE);
1679 static void drbd_thread_init(struct drbd_conf *mdev, struct drbd_thread *thi,
1680 int (*func) (struct drbd_thread *))
1682 spin_lock_init(&thi->t_lock);
1684 thi->t_state = None;
1685 thi->function = func;
1689 int drbd_thread_start(struct drbd_thread *thi)
1691 struct drbd_conf *mdev = thi->mdev;
1692 struct task_struct *nt;
1693 unsigned long flags;
1696 thi == &mdev->receiver ? "receiver" :
1697 thi == &mdev->asender ? "asender" :
1698 thi == &mdev->worker ? "worker" : "NONSENSE";
1700 /* is used from state engine doing drbd_thread_stop_nowait,
1701 * while holding the req lock irqsave */
1702 spin_lock_irqsave(&thi->t_lock, flags);
1704 switch (thi->t_state) {
1706 dev_info(DEV, "Starting %s thread (from %s [%d])\n",
1707 me, current->comm, current->pid);
1709 /* Get ref on module for thread - this is released when thread exits */
1710 if (!try_module_get(THIS_MODULE)) {
1711 dev_err(DEV, "Failed to get module reference in drbd_thread_start\n");
1712 spin_unlock_irqrestore(&thi->t_lock, flags);
1716 init_completion(&thi->stop);
1717 D_ASSERT(thi->task == NULL);
1718 thi->reset_cpu_mask = 1;
1719 thi->t_state = Running;
1720 spin_unlock_irqrestore(&thi->t_lock, flags);
1721 flush_signals(current); /* otherw. may get -ERESTARTNOINTR */
1723 nt = kthread_create(drbd_thread_setup, (void *) thi,
1724 "drbd%d_%s", mdev_to_minor(mdev), me);
1727 dev_err(DEV, "Couldn't start thread\n");
1729 module_put(THIS_MODULE);
1732 spin_lock_irqsave(&thi->t_lock, flags);
1734 thi->t_state = Running;
1735 spin_unlock_irqrestore(&thi->t_lock, flags);
1736 wake_up_process(nt);
1739 thi->t_state = Restarting;
1740 dev_info(DEV, "Restarting %s thread (from %s [%d])\n",
1741 me, current->comm, current->pid);
1746 spin_unlock_irqrestore(&thi->t_lock, flags);
1754 void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait)
1756 unsigned long flags;
1758 enum drbd_thread_state ns = restart ? Restarting : Exiting;
1760 /* may be called from state engine, holding the req lock irqsave */
1761 spin_lock_irqsave(&thi->t_lock, flags);
1763 if (thi->t_state == None) {
1764 spin_unlock_irqrestore(&thi->t_lock, flags);
1766 drbd_thread_start(thi);
1770 if (thi->t_state != ns) {
1771 if (thi->task == NULL) {
1772 spin_unlock_irqrestore(&thi->t_lock, flags);
1778 init_completion(&thi->stop);
1779 if (thi->task != current)
1780 force_sig(DRBD_SIGKILL, thi->task);
1784 spin_unlock_irqrestore(&thi->t_lock, flags);
1787 wait_for_completion(&thi->stop);
1792 * drbd_calc_cpu_mask() - Generate CPU masks, spread over all CPUs
1793 * @mdev: DRBD device.
1795 * Forces all threads of a device onto the same CPU. This is beneficial for
1796 * DRBD's performance. May be overwritten by user's configuration.
1798 void drbd_calc_cpu_mask(struct drbd_conf *mdev)
1802 /* user override. */
1803 if (cpumask_weight(mdev->cpu_mask))
1806 ord = mdev_to_minor(mdev) % cpumask_weight(cpu_online_mask);
1807 for_each_online_cpu(cpu) {
1809 cpumask_set_cpu(cpu, mdev->cpu_mask);
1813 /* should not be reached */
1814 cpumask_setall(mdev->cpu_mask);
1818 * drbd_thread_current_set_cpu() - modifies the cpu mask of the _current_ thread
1819 * @mdev: DRBD device.
1821 * call in the "main loop" of _all_ threads, no need for any mutex, current won't die
1824 void drbd_thread_current_set_cpu(struct drbd_conf *mdev)
1826 struct task_struct *p = current;
1827 struct drbd_thread *thi =
1828 p == mdev->asender.task ? &mdev->asender :
1829 p == mdev->receiver.task ? &mdev->receiver :
1830 p == mdev->worker.task ? &mdev->worker :
1834 if (!thi->reset_cpu_mask)
1836 thi->reset_cpu_mask = 0;
1837 set_cpus_allowed_ptr(p, mdev->cpu_mask);
1841 /* the appropriate socket mutex must be held already */
1842 int _drbd_send_cmd(struct drbd_conf *mdev, struct socket *sock,
1843 enum drbd_packets cmd, struct p_header80 *h,
1844 size_t size, unsigned msg_flags)
1848 ERR_IF(!h) return false;
1849 ERR_IF(!size) return false;
1851 h->magic = BE_DRBD_MAGIC;
1852 h->command = cpu_to_be16(cmd);
1853 h->length = cpu_to_be16(size-sizeof(struct p_header80));
1855 sent = drbd_send(mdev, sock, h, size, msg_flags);
1857 ok = (sent == size);
1859 dev_err(DEV, "short sent %s size=%d sent=%d\n",
1860 cmdname(cmd), (int)size, sent);
1864 /* don't pass the socket. we may only look at it
1865 * when we hold the appropriate socket mutex.
1867 int drbd_send_cmd(struct drbd_conf *mdev, int use_data_socket,
1868 enum drbd_packets cmd, struct p_header80 *h, size_t size)
1871 struct socket *sock;
1873 if (use_data_socket) {
1874 mutex_lock(&mdev->data.mutex);
1875 sock = mdev->data.socket;
1877 mutex_lock(&mdev->meta.mutex);
1878 sock = mdev->meta.socket;
1881 /* drbd_disconnect() could have called drbd_free_sock()
1882 * while we were waiting in down()... */
1883 if (likely(sock != NULL))
1884 ok = _drbd_send_cmd(mdev, sock, cmd, h, size, 0);
1886 if (use_data_socket)
1887 mutex_unlock(&mdev->data.mutex);
1889 mutex_unlock(&mdev->meta.mutex);
1893 int drbd_send_cmd2(struct drbd_conf *mdev, enum drbd_packets cmd, char *data,
1896 struct p_header80 h;
1899 h.magic = BE_DRBD_MAGIC;
1900 h.command = cpu_to_be16(cmd);
1901 h.length = cpu_to_be16(size);
1903 if (!drbd_get_data_sock(mdev))
1907 drbd_send(mdev, mdev->data.socket, &h, sizeof(h), 0));
1909 drbd_send(mdev, mdev->data.socket, data, size, 0));
1911 drbd_put_data_sock(mdev);
1916 int drbd_send_sync_param(struct drbd_conf *mdev, struct syncer_conf *sc)
1918 struct p_rs_param_95 *p;
1919 struct socket *sock;
1921 const int apv = mdev->agreed_pro_version;
1923 size = apv <= 87 ? sizeof(struct p_rs_param)
1924 : apv == 88 ? sizeof(struct p_rs_param)
1925 + strlen(mdev->sync_conf.verify_alg) + 1
1926 : apv <= 94 ? sizeof(struct p_rs_param_89)
1927 : /* apv >= 95 */ sizeof(struct p_rs_param_95);
1929 /* used from admin command context and receiver/worker context.
1930 * to avoid kmalloc, grab the socket right here,
1931 * then use the pre-allocated sbuf there */
1932 mutex_lock(&mdev->data.mutex);
1933 sock = mdev->data.socket;
1935 if (likely(sock != NULL)) {
1936 enum drbd_packets cmd = apv >= 89 ? P_SYNC_PARAM89 : P_SYNC_PARAM;
1938 p = &mdev->data.sbuf.rs_param_95;
1940 /* initialize verify_alg and csums_alg */
1941 memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX);
1943 p->rate = cpu_to_be32(sc->rate);
1944 p->c_plan_ahead = cpu_to_be32(sc->c_plan_ahead);
1945 p->c_delay_target = cpu_to_be32(sc->c_delay_target);
1946 p->c_fill_target = cpu_to_be32(sc->c_fill_target);
1947 p->c_max_rate = cpu_to_be32(sc->c_max_rate);
1950 strcpy(p->verify_alg, mdev->sync_conf.verify_alg);
1952 strcpy(p->csums_alg, mdev->sync_conf.csums_alg);
1954 rv = _drbd_send_cmd(mdev, sock, cmd, &p->head, size, 0);
1956 rv = 0; /* not ok */
1958 mutex_unlock(&mdev->data.mutex);
1963 int drbd_send_protocol(struct drbd_conf *mdev)
1965 struct p_protocol *p;
1968 size = sizeof(struct p_protocol);
1970 if (mdev->agreed_pro_version >= 87)
1971 size += strlen(mdev->net_conf->integrity_alg) + 1;
1973 /* we must not recurse into our own queue,
1974 * as that is blocked during handshake */
1975 p = kmalloc(size, GFP_NOIO);
1979 p->protocol = cpu_to_be32(mdev->net_conf->wire_protocol);
1980 p->after_sb_0p = cpu_to_be32(mdev->net_conf->after_sb_0p);
1981 p->after_sb_1p = cpu_to_be32(mdev->net_conf->after_sb_1p);
1982 p->after_sb_2p = cpu_to_be32(mdev->net_conf->after_sb_2p);
1983 p->two_primaries = cpu_to_be32(mdev->net_conf->two_primaries);
1986 if (mdev->net_conf->want_lose)
1988 if (mdev->net_conf->dry_run) {
1989 if (mdev->agreed_pro_version >= 92)
1992 dev_err(DEV, "--dry-run is not supported by peer");
1997 p->conn_flags = cpu_to_be32(cf);
1999 if (mdev->agreed_pro_version >= 87)
2000 strcpy(p->integrity_alg, mdev->net_conf->integrity_alg);
2002 rv = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_PROTOCOL,
2003 (struct p_header80 *)p, size);
2008 int _drbd_send_uuids(struct drbd_conf *mdev, u64 uuid_flags)
2013 if (!get_ldev_if_state(mdev, D_NEGOTIATING))
2016 for (i = UI_CURRENT; i < UI_SIZE; i++)
2017 p.uuid[i] = mdev->ldev ? cpu_to_be64(mdev->ldev->md.uuid[i]) : 0;
2019 mdev->comm_bm_set = drbd_bm_total_weight(mdev);
2020 p.uuid[UI_SIZE] = cpu_to_be64(mdev->comm_bm_set);
2021 uuid_flags |= mdev->net_conf->want_lose ? 1 : 0;
2022 uuid_flags |= test_bit(CRASHED_PRIMARY, &mdev->flags) ? 2 : 0;
2023 uuid_flags |= mdev->new_state_tmp.disk == D_INCONSISTENT ? 4 : 0;
2024 p.uuid[UI_FLAGS] = cpu_to_be64(uuid_flags);
2028 return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_UUIDS,
2029 (struct p_header80 *)&p, sizeof(p));
2032 int drbd_send_uuids(struct drbd_conf *mdev)
2034 return _drbd_send_uuids(mdev, 0);
2037 int drbd_send_uuids_skip_initial_sync(struct drbd_conf *mdev)
2039 return _drbd_send_uuids(mdev, 8);
2042 void drbd_print_uuids(struct drbd_conf *mdev, const char *text)
2044 if (get_ldev_if_state(mdev, D_NEGOTIATING)) {
2045 u64 *uuid = mdev->ldev->md.uuid;
2046 dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX\n",
2048 (unsigned long long)uuid[UI_CURRENT],
2049 (unsigned long long)uuid[UI_BITMAP],
2050 (unsigned long long)uuid[UI_HISTORY_START],
2051 (unsigned long long)uuid[UI_HISTORY_END]);
2054 dev_info(DEV, "%s effective data uuid: %016llX\n",
2056 (unsigned long long)mdev->ed_uuid);
2060 int drbd_gen_and_send_sync_uuid(struct drbd_conf *mdev)
2065 D_ASSERT(mdev->state.disk == D_UP_TO_DATE);
2067 uuid = mdev->ldev->md.uuid[UI_BITMAP] + UUID_NEW_BM_OFFSET;
2068 drbd_uuid_set(mdev, UI_BITMAP, uuid);
2069 drbd_print_uuids(mdev, "updated sync UUID");
2071 p.uuid = cpu_to_be64(uuid);
2073 return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_SYNC_UUID,
2074 (struct p_header80 *)&p, sizeof(p));
2077 int drbd_send_sizes(struct drbd_conf *mdev, int trigger_reply, enum dds_flags flags)
2080 sector_t d_size, u_size;
2084 if (get_ldev_if_state(mdev, D_NEGOTIATING)) {
2085 D_ASSERT(mdev->ldev->backing_bdev);
2086 d_size = drbd_get_max_capacity(mdev->ldev);
2087 u_size = mdev->ldev->dc.disk_size;
2088 q_order_type = drbd_queue_order_type(mdev);
2093 q_order_type = QUEUE_ORDERED_NONE;
2096 p.d_size = cpu_to_be64(d_size);
2097 p.u_size = cpu_to_be64(u_size);
2098 p.c_size = cpu_to_be64(trigger_reply ? 0 : drbd_get_capacity(mdev->this_bdev));
2099 p.max_bio_size = cpu_to_be32(queue_max_hw_sectors(mdev->rq_queue) << 9);
2100 p.queue_order_type = cpu_to_be16(q_order_type);
2101 p.dds_flags = cpu_to_be16(flags);
2103 ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_SIZES,
2104 (struct p_header80 *)&p, sizeof(p));
2109 * drbd_send_state() - Sends the drbd state to the peer
2110 * @mdev: DRBD device.
2112 int drbd_send_state(struct drbd_conf *mdev)
2114 struct socket *sock;
2118 /* Grab state lock so we wont send state if we're in the middle
2119 * of a cluster wide state change on another thread */
2120 drbd_state_lock(mdev);
2122 mutex_lock(&mdev->data.mutex);
2124 p.state = cpu_to_be32(mdev->state.i); /* Within the send mutex */
2125 sock = mdev->data.socket;
2127 if (likely(sock != NULL)) {
2128 ok = _drbd_send_cmd(mdev, sock, P_STATE,
2129 (struct p_header80 *)&p, sizeof(p), 0);
2132 mutex_unlock(&mdev->data.mutex);
2134 drbd_state_unlock(mdev);
2138 int drbd_send_state_req(struct drbd_conf *mdev,
2139 union drbd_state mask, union drbd_state val)
2141 struct p_req_state p;
2143 p.mask = cpu_to_be32(mask.i);
2144 p.val = cpu_to_be32(val.i);
2146 return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_STATE_CHG_REQ,
2147 (struct p_header80 *)&p, sizeof(p));
2150 int drbd_send_sr_reply(struct drbd_conf *mdev, enum drbd_state_rv retcode)
2152 struct p_req_state_reply p;
2154 p.retcode = cpu_to_be32(retcode);
2156 return drbd_send_cmd(mdev, USE_META_SOCKET, P_STATE_CHG_REPLY,
2157 (struct p_header80 *)&p, sizeof(p));
2160 int fill_bitmap_rle_bits(struct drbd_conf *mdev,
2161 struct p_compressed_bm *p,
2162 struct bm_xfer_ctx *c)
2164 struct bitstream bs;
2165 unsigned long plain_bits;
2172 /* may we use this feature? */
2173 if ((mdev->sync_conf.use_rle == 0) ||
2174 (mdev->agreed_pro_version < 90))
2177 if (c->bit_offset >= c->bm_bits)
2178 return 0; /* nothing to do. */
2180 /* use at most thus many bytes */
2181 bitstream_init(&bs, p->code, BM_PACKET_VLI_BYTES_MAX, 0);
2182 memset(p->code, 0, BM_PACKET_VLI_BYTES_MAX);
2183 /* plain bits covered in this code string */
2186 /* p->encoding & 0x80 stores whether the first run length is set.
2187 * bit offset is implicit.
2188 * start with toggle == 2 to be able to tell the first iteration */
2191 /* see how much plain bits we can stuff into one packet
2192 * using RLE and VLI. */
2194 tmp = (toggle == 0) ? _drbd_bm_find_next_zero(mdev, c->bit_offset)
2195 : _drbd_bm_find_next(mdev, c->bit_offset);
2198 rl = tmp - c->bit_offset;
2200 if (toggle == 2) { /* first iteration */
2202 /* the first checked bit was set,
2203 * store start value, */
2204 DCBP_set_start(p, 1);
2205 /* but skip encoding of zero run length */
2209 DCBP_set_start(p, 0);
2212 /* paranoia: catch zero runlength.
2213 * can only happen if bitmap is modified while we scan it. */
2215 dev_err(DEV, "unexpected zero runlength while encoding bitmap "
2216 "t:%u bo:%lu\n", toggle, c->bit_offset);
2220 bits = vli_encode_bits(&bs, rl);
2221 if (bits == -ENOBUFS) /* buffer full */
2224 dev_err(DEV, "error while encoding bitmap: %d\n", bits);
2230 c->bit_offset = tmp;
2231 } while (c->bit_offset < c->bm_bits);
2233 len = bs.cur.b - p->code + !!bs.cur.bit;
2235 if (plain_bits < (len << 3)) {
2236 /* incompressible with this method.
2237 * we need to rewind both word and bit position. */
2238 c->bit_offset -= plain_bits;
2239 bm_xfer_ctx_bit_to_word_offset(c);
2240 c->bit_offset = c->word_offset * BITS_PER_LONG;
2244 /* RLE + VLI was able to compress it just fine.
2245 * update c->word_offset. */
2246 bm_xfer_ctx_bit_to_word_offset(c);
2248 /* store pad_bits */
2249 DCBP_set_pad_bits(p, (8 - bs.cur.bit) & 0x7);
2255 * send_bitmap_rle_or_plain
2257 * Return 0 when done, 1 when another iteration is needed, and a negative error
2258 * code upon failure.
2261 send_bitmap_rle_or_plain(struct drbd_conf *mdev,
2262 struct p_header80 *h, struct bm_xfer_ctx *c)
2264 struct p_compressed_bm *p = (void*)h;
2265 unsigned long num_words;
2269 len = fill_bitmap_rle_bits(mdev, p, c);
2275 DCBP_set_code(p, RLE_VLI_Bits);
2276 ok = _drbd_send_cmd(mdev, mdev->data.socket, P_COMPRESSED_BITMAP, h,
2277 sizeof(*p) + len, 0);
2280 c->bytes[0] += sizeof(*p) + len;
2282 if (c->bit_offset >= c->bm_bits)
2285 /* was not compressible.
2286 * send a buffer full of plain text bits instead. */
2287 num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset);
2288 len = num_words * sizeof(long);
2290 drbd_bm_get_lel(mdev, c->word_offset, num_words, (unsigned long*)h->payload);
2291 ok = _drbd_send_cmd(mdev, mdev->data.socket, P_BITMAP,
2292 h, sizeof(struct p_header80) + len, 0);
2293 c->word_offset += num_words;
2294 c->bit_offset = c->word_offset * BITS_PER_LONG;
2297 c->bytes[1] += sizeof(struct p_header80) + len;
2299 if (c->bit_offset > c->bm_bits)
2300 c->bit_offset = c->bm_bits;
2304 INFO_bm_xfer_stats(mdev, "send", c);
2312 /* See the comment at receive_bitmap() */
2313 int _drbd_send_bitmap(struct drbd_conf *mdev)
2315 struct bm_xfer_ctx c;
2316 struct p_header80 *p;
2319 ERR_IF(!mdev->bitmap) return false;
2321 /* maybe we should use some per thread scratch page,
2322 * and allocate that during initial device creation? */
2323 p = (struct p_header80 *) __get_free_page(GFP_NOIO);
2325 dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__);
2329 if (get_ldev(mdev)) {
2330 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
2331 dev_info(DEV, "Writing the whole bitmap, MDF_FullSync was set.\n");
2332 drbd_bm_set_all(mdev);
2333 if (drbd_bm_write(mdev)) {
2334 /* write_bm did fail! Leave full sync flag set in Meta P_DATA
2335 * but otherwise process as per normal - need to tell other
2336 * side that a full resync is required! */
2337 dev_err(DEV, "Failed to write bitmap to disk!\n");
2339 drbd_md_clear_flag(mdev, MDF_FULL_SYNC);
2346 c = (struct bm_xfer_ctx) {
2347 .bm_bits = drbd_bm_bits(mdev),
2348 .bm_words = drbd_bm_words(mdev),
2352 err = send_bitmap_rle_or_plain(mdev, p, &c);
2355 free_page((unsigned long) p);
2359 int drbd_send_bitmap(struct drbd_conf *mdev)
2363 if (!drbd_get_data_sock(mdev))
2365 err = !_drbd_send_bitmap(mdev);
2366 drbd_put_data_sock(mdev);
2370 int drbd_send_b_ack(struct drbd_conf *mdev, u32 barrier_nr, u32 set_size)
2373 struct p_barrier_ack p;
2375 p.barrier = barrier_nr;
2376 p.set_size = cpu_to_be32(set_size);
2378 if (mdev->state.conn < C_CONNECTED)
2380 ok = drbd_send_cmd(mdev, USE_META_SOCKET, P_BARRIER_ACK,
2381 (struct p_header80 *)&p, sizeof(p));
2386 * _drbd_send_ack() - Sends an ack packet
2387 * @mdev: DRBD device.
2388 * @cmd: Packet command code.
2389 * @sector: sector, needs to be in big endian byte order
2390 * @blksize: size in byte, needs to be in big endian byte order
2391 * @block_id: Id, big endian byte order
2393 static int _drbd_send_ack(struct drbd_conf *mdev, enum drbd_packets cmd,
2399 struct p_block_ack p;
2402 p.block_id = block_id;
2403 p.blksize = blksize;
2404 p.seq_num = cpu_to_be32(atomic_add_return(1, &mdev->packet_seq));
2406 if (!mdev->meta.socket || mdev->state.conn < C_CONNECTED)
2408 ok = drbd_send_cmd(mdev, USE_META_SOCKET, cmd,
2409 (struct p_header80 *)&p, sizeof(p));
2413 /* dp->sector and dp->block_id already/still in network byte order,
2414 * data_size is payload size according to dp->head,
2415 * and may need to be corrected for digest size. */
2416 int drbd_send_ack_dp(struct drbd_conf *mdev, enum drbd_packets cmd,
2417 struct p_data *dp, int data_size)
2419 data_size -= (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ?
2420 crypto_hash_digestsize(mdev->integrity_r_tfm) : 0;
2421 return _drbd_send_ack(mdev, cmd, dp->sector, cpu_to_be32(data_size),
2425 int drbd_send_ack_rp(struct drbd_conf *mdev, enum drbd_packets cmd,
2426 struct p_block_req *rp)
2428 return _drbd_send_ack(mdev, cmd, rp->sector, rp->blksize, rp->block_id);
2432 * drbd_send_ack() - Sends an ack packet
2433 * @mdev: DRBD device.
2434 * @cmd: Packet command code.
2437 int drbd_send_ack(struct drbd_conf *mdev,
2438 enum drbd_packets cmd, struct drbd_epoch_entry *e)
2440 return _drbd_send_ack(mdev, cmd,
2441 cpu_to_be64(e->sector),
2442 cpu_to_be32(e->size),
2446 /* This function misuses the block_id field to signal if the blocks
2447 * are is sync or not. */
2448 int drbd_send_ack_ex(struct drbd_conf *mdev, enum drbd_packets cmd,
2449 sector_t sector, int blksize, u64 block_id)
2451 return _drbd_send_ack(mdev, cmd,
2452 cpu_to_be64(sector),
2453 cpu_to_be32(blksize),
2454 cpu_to_be64(block_id));
2457 int drbd_send_drequest(struct drbd_conf *mdev, int cmd,
2458 sector_t sector, int size, u64 block_id)
2461 struct p_block_req p;
2463 p.sector = cpu_to_be64(sector);
2464 p.block_id = block_id;
2465 p.blksize = cpu_to_be32(size);
2467 ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, cmd,
2468 (struct p_header80 *)&p, sizeof(p));
2472 int drbd_send_drequest_csum(struct drbd_conf *mdev,
2473 sector_t sector, int size,
2474 void *digest, int digest_size,
2475 enum drbd_packets cmd)
2478 struct p_block_req p;
2480 p.sector = cpu_to_be64(sector);
2481 p.block_id = BE_DRBD_MAGIC + 0xbeef;
2482 p.blksize = cpu_to_be32(size);
2484 p.head.magic = BE_DRBD_MAGIC;
2485 p.head.command = cpu_to_be16(cmd);
2486 p.head.length = cpu_to_be16(sizeof(p) - sizeof(struct p_header80) + digest_size);
2488 mutex_lock(&mdev->data.mutex);
2490 ok = (sizeof(p) == drbd_send(mdev, mdev->data.socket, &p, sizeof(p), 0));
2491 ok = ok && (digest_size == drbd_send(mdev, mdev->data.socket, digest, digest_size, 0));
2493 mutex_unlock(&mdev->data.mutex);
2498 int drbd_send_ov_request(struct drbd_conf *mdev, sector_t sector, int size)
2501 struct p_block_req p;
2503 p.sector = cpu_to_be64(sector);
2504 p.block_id = BE_DRBD_MAGIC + 0xbabe;
2505 p.blksize = cpu_to_be32(size);
2507 ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_OV_REQUEST,
2508 (struct p_header80 *)&p, sizeof(p));
2512 /* called on sndtimeo
2513 * returns false if we should retry,
2514 * true if we think connection is dead
2516 static int we_should_drop_the_connection(struct drbd_conf *mdev, struct socket *sock)
2519 /* long elapsed = (long)(jiffies - mdev->last_received); */
2521 drop_it = mdev->meta.socket == sock
2522 || !mdev->asender.task
2523 || get_t_state(&mdev->asender) != Running
2524 || mdev->state.conn < C_CONNECTED;
2529 drop_it = !--mdev->ko_count;
2531 dev_err(DEV, "[%s/%d] sock_sendmsg time expired, ko = %u\n",
2532 current->comm, current->pid, mdev->ko_count);
2536 return drop_it; /* && (mdev->state == R_PRIMARY) */;
2539 /* The idea of sendpage seems to be to put some kind of reference
2540 * to the page into the skb, and to hand it over to the NIC. In
2541 * this process get_page() gets called.
2543 * As soon as the page was really sent over the network put_page()
2544 * gets called by some part of the network layer. [ NIC driver? ]
2546 * [ get_page() / put_page() increment/decrement the count. If count
2547 * reaches 0 the page will be freed. ]
2549 * This works nicely with pages from FSs.
2550 * But this means that in protocol A we might signal IO completion too early!
2552 * In order not to corrupt data during a resync we must make sure
2553 * that we do not reuse our own buffer pages (EEs) to early, therefore
2554 * we have the net_ee list.
2556 * XFS seems to have problems, still, it submits pages with page_count == 0!
2557 * As a workaround, we disable sendpage on pages
2558 * with page_count == 0 or PageSlab.
2560 static int _drbd_no_send_page(struct drbd_conf *mdev, struct page *page,
2561 int offset, size_t size, unsigned msg_flags)
2563 int sent = drbd_send(mdev, mdev->data.socket, kmap(page) + offset, size, msg_flags);
2566 mdev->send_cnt += size>>9;
2567 return sent == size;
2570 static int _drbd_send_page(struct drbd_conf *mdev, struct page *page,
2571 int offset, size_t size, unsigned msg_flags)
2573 mm_segment_t oldfs = get_fs();
2577 /* e.g. XFS meta- & log-data is in slab pages, which have a
2578 * page_count of 0 and/or have PageSlab() set.
2579 * we cannot use send_page for those, as that does get_page();
2580 * put_page(); and would cause either a VM_BUG directly, or
2581 * __page_cache_release a page that would actually still be referenced
2582 * by someone, leading to some obscure delayed Oops somewhere else. */
2583 if (disable_sendpage || (page_count(page) < 1) || PageSlab(page))
2584 return _drbd_no_send_page(mdev, page, offset, size, msg_flags);
2586 msg_flags |= MSG_NOSIGNAL;
2587 drbd_update_congested(mdev);
2590 sent = mdev->data.socket->ops->sendpage(mdev->data.socket, page,
2593 if (sent == -EAGAIN) {
2594 if (we_should_drop_the_connection(mdev,
2601 dev_warn(DEV, "%s: size=%d len=%d sent=%d\n",
2602 __func__, (int)size, len, sent);
2607 } while (len > 0 /* THINK && mdev->cstate >= C_CONNECTED*/);
2609 clear_bit(NET_CONGESTED, &mdev->flags);
2613 mdev->send_cnt += size>>9;
2617 static int _drbd_send_bio(struct drbd_conf *mdev, struct bio *bio)
2619 struct bio_vec *bvec;
2621 /* hint all but last page with MSG_MORE */
2622 __bio_for_each_segment(bvec, bio, i, 0) {
2623 if (!_drbd_no_send_page(mdev, bvec->bv_page,
2624 bvec->bv_offset, bvec->bv_len,
2625 i == bio->bi_vcnt -1 ? 0 : MSG_MORE))
2631 static int _drbd_send_zc_bio(struct drbd_conf *mdev, struct bio *bio)
2633 struct bio_vec *bvec;
2635 /* hint all but last page with MSG_MORE */
2636 __bio_for_each_segment(bvec, bio, i, 0) {
2637 if (!_drbd_send_page(mdev, bvec->bv_page,
2638 bvec->bv_offset, bvec->bv_len,
2639 i == bio->bi_vcnt -1 ? 0 : MSG_MORE))
2645 static int _drbd_send_zc_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e)
2647 struct page *page = e->pages;
2648 unsigned len = e->size;
2649 /* hint all but last page with MSG_MORE */
2650 page_chain_for_each(page) {
2651 unsigned l = min_t(unsigned, len, PAGE_SIZE);
2652 if (!_drbd_send_page(mdev, page, 0, l,
2653 page_chain_next(page) ? MSG_MORE : 0))
2660 static u32 bio_flags_to_wire(struct drbd_conf *mdev, unsigned long bi_rw)
2662 if (mdev->agreed_pro_version >= 95)
2663 return (bi_rw & REQ_SYNC ? DP_RW_SYNC : 0) |
2664 (bi_rw & REQ_FUA ? DP_FUA : 0) |
2665 (bi_rw & REQ_FLUSH ? DP_FLUSH : 0) |
2666 (bi_rw & REQ_DISCARD ? DP_DISCARD : 0);
2668 return bi_rw & REQ_SYNC ? DP_RW_SYNC : 0;
2671 /* Used to send write requests
2672 * R_PRIMARY -> Peer (P_DATA)
2674 int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req)
2678 unsigned int dp_flags = 0;
2682 if (!drbd_get_data_sock(mdev))
2685 dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_w_tfm) ?
2686 crypto_hash_digestsize(mdev->integrity_w_tfm) : 0;
2688 if (req->size <= DRBD_MAX_SIZE_H80_PACKET) {
2689 p.head.h80.magic = BE_DRBD_MAGIC;
2690 p.head.h80.command = cpu_to_be16(P_DATA);
2692 cpu_to_be16(sizeof(p) - sizeof(union p_header) + dgs + req->size);
2694 p.head.h95.magic = BE_DRBD_MAGIC_BIG;
2695 p.head.h95.command = cpu_to_be16(P_DATA);
2697 cpu_to_be32(sizeof(p) - sizeof(union p_header) + dgs + req->size);
2700 p.sector = cpu_to_be64(req->sector);
2701 p.block_id = (unsigned long)req;
2702 p.seq_num = cpu_to_be32(req->seq_num =
2703 atomic_add_return(1, &mdev->packet_seq));
2705 dp_flags = bio_flags_to_wire(mdev, req->master_bio->bi_rw);
2707 if (mdev->state.conn >= C_SYNC_SOURCE &&
2708 mdev->state.conn <= C_PAUSED_SYNC_T)
2709 dp_flags |= DP_MAY_SET_IN_SYNC;
2711 p.dp_flags = cpu_to_be32(dp_flags);
2712 set_bit(UNPLUG_REMOTE, &mdev->flags);
2714 drbd_send(mdev, mdev->data.socket, &p, sizeof(p), dgs ? MSG_MORE : 0));
2716 dgb = mdev->int_dig_out;
2717 drbd_csum_bio(mdev, mdev->integrity_w_tfm, req->master_bio, dgb);
2718 ok = dgs == drbd_send(mdev, mdev->data.socket, dgb, dgs, 0);
2721 /* For protocol A, we have to memcpy the payload into
2722 * socket buffers, as we may complete right away
2723 * as soon as we handed it over to tcp, at which point the data
2724 * pages may become invalid.
2726 * For data-integrity enabled, we copy it as well, so we can be
2727 * sure that even if the bio pages may still be modified, it
2728 * won't change the data on the wire, thus if the digest checks
2729 * out ok after sending on this side, but does not fit on the
2730 * receiving side, we sure have detected corruption elsewhere.
2732 if (mdev->net_conf->wire_protocol == DRBD_PROT_A || dgs)
2733 ok = _drbd_send_bio(mdev, req->master_bio);
2735 ok = _drbd_send_zc_bio(mdev, req->master_bio);
2737 /* double check digest, sometimes buffers have been modified in flight. */
2738 if (dgs > 0 && dgs <= 64) {
2739 /* 64 byte, 512 bit, is the larges digest size
2740 * currently supported in kernel crypto. */
2741 unsigned char digest[64];
2742 drbd_csum_bio(mdev, mdev->integrity_w_tfm, req->master_bio, digest);
2743 if (memcmp(mdev->int_dig_out, digest, dgs)) {
2745 "Digest mismatch, buffer modified by upper layers during write: %llus +%u\n",
2746 (unsigned long long)req->sector, req->size);
2748 } /* else if (dgs > 64) {
2749 ... Be noisy about digest too large ...
2753 drbd_put_data_sock(mdev);
2758 /* answer packet, used to send data back for read requests:
2759 * Peer -> (diskless) R_PRIMARY (P_DATA_REPLY)
2760 * C_SYNC_SOURCE -> C_SYNC_TARGET (P_RS_DATA_REPLY)
2762 int drbd_send_block(struct drbd_conf *mdev, enum drbd_packets cmd,
2763 struct drbd_epoch_entry *e)
2770 dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_w_tfm) ?
2771 crypto_hash_digestsize(mdev->integrity_w_tfm) : 0;
2773 if (e->size <= DRBD_MAX_SIZE_H80_PACKET) {
2774 p.head.h80.magic = BE_DRBD_MAGIC;
2775 p.head.h80.command = cpu_to_be16(cmd);
2777 cpu_to_be16(sizeof(p) - sizeof(struct p_header80) + dgs + e->size);
2779 p.head.h95.magic = BE_DRBD_MAGIC_BIG;
2780 p.head.h95.command = cpu_to_be16(cmd);
2782 cpu_to_be32(sizeof(p) - sizeof(struct p_header80) + dgs + e->size);
2785 p.sector = cpu_to_be64(e->sector);
2786 p.block_id = e->block_id;
2787 /* p.seq_num = 0; No sequence numbers here.. */
2789 /* Only called by our kernel thread.
2790 * This one may be interrupted by DRBD_SIG and/or DRBD_SIGKILL
2791 * in response to admin command or module unload.
2793 if (!drbd_get_data_sock(mdev))
2796 ok = sizeof(p) == drbd_send(mdev, mdev->data.socket, &p, sizeof(p), dgs ? MSG_MORE : 0);
2798 dgb = mdev->int_dig_out;
2799 drbd_csum_ee(mdev, mdev->integrity_w_tfm, e, dgb);
2800 ok = dgs == drbd_send(mdev, mdev->data.socket, dgb, dgs, 0);
2803 ok = _drbd_send_zc_ee(mdev, e);
2805 drbd_put_data_sock(mdev);
2810 int drbd_send_oos(struct drbd_conf *mdev, struct drbd_request *req)
2812 struct p_block_desc p;
2814 p.sector = cpu_to_be64(req->sector);
2815 p.blksize = cpu_to_be32(req->size);
2817 return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_OUT_OF_SYNC, &p.head, sizeof(p));
2821 drbd_send distinguishes two cases:
2823 Packets sent via the data socket "sock"
2824 and packets sent via the meta data socket "msock"
2827 -----------------+-------------------------+------------------------------
2828 timeout conf.timeout / 2 conf.timeout / 2
2829 timeout action send a ping via msock Abort communication
2830 and close all sockets
2834 * you must have down()ed the appropriate [m]sock_mutex elsewhere!
2836 int drbd_send(struct drbd_conf *mdev, struct socket *sock,
2837 void *buf, size_t size, unsigned msg_flags)
2846 /* THINK if (signal_pending) return ... ? */
2851 msg.msg_name = NULL;
2852 msg.msg_namelen = 0;
2853 msg.msg_control = NULL;
2854 msg.msg_controllen = 0;
2855 msg.msg_flags = msg_flags | MSG_NOSIGNAL;
2857 if (sock == mdev->data.socket) {
2858 mdev->ko_count = mdev->net_conf->ko_count;
2859 drbd_update_congested(mdev);
2863 * tcp_sendmsg does _not_ use its size parameter at all ?
2865 * -EAGAIN on timeout, -EINTR on signal.
2868 * do we need to block DRBD_SIG if sock == &meta.socket ??
2869 * otherwise wake_asender() might interrupt some send_*Ack !
2871 rv = kernel_sendmsg(sock, &msg, &iov, 1, size);
2872 if (rv == -EAGAIN) {
2873 if (we_should_drop_the_connection(mdev, sock))
2880 flush_signals(current);
2888 } while (sent < size);
2890 if (sock == mdev->data.socket)
2891 clear_bit(NET_CONGESTED, &mdev->flags);
2894 if (rv != -EAGAIN) {
2895 dev_err(DEV, "%s_sendmsg returned %d\n",
2896 sock == mdev->meta.socket ? "msock" : "sock",
2898 drbd_force_state(mdev, NS(conn, C_BROKEN_PIPE));
2900 drbd_force_state(mdev, NS(conn, C_TIMEOUT));
2906 static int drbd_open(struct block_device *bdev, fmode_t mode)
2908 struct drbd_conf *mdev = bdev->bd_disk->private_data;
2909 unsigned long flags;
2912 mutex_lock(&drbd_main_mutex);
2913 spin_lock_irqsave(&mdev->req_lock, flags);
2914 /* to have a stable mdev->state.role
2915 * and no race with updating open_cnt */
2917 if (mdev->state.role != R_PRIMARY) {
2918 if (mode & FMODE_WRITE)
2920 else if (!allow_oos)
2926 spin_unlock_irqrestore(&mdev->req_lock, flags);
2927 mutex_unlock(&drbd_main_mutex);
2932 static int drbd_release(struct gendisk *gd, fmode_t mode)
2934 struct drbd_conf *mdev = gd->private_data;
2935 mutex_lock(&drbd_main_mutex);
2937 mutex_unlock(&drbd_main_mutex);
2941 static void drbd_set_defaults(struct drbd_conf *mdev)
2943 /* This way we get a compile error when sync_conf grows,
2944 and we forgot to initialize it here */
2945 mdev->sync_conf = (struct syncer_conf) {
2946 /* .rate = */ DRBD_RATE_DEF,
2947 /* .after = */ DRBD_AFTER_DEF,
2948 /* .al_extents = */ DRBD_AL_EXTENTS_DEF,
2949 /* .verify_alg = */ {}, 0,
2950 /* .cpu_mask = */ {}, 0,
2951 /* .csums_alg = */ {}, 0,
2953 /* .on_no_data = */ DRBD_ON_NO_DATA_DEF,
2954 /* .c_plan_ahead = */ DRBD_C_PLAN_AHEAD_DEF,
2955 /* .c_delay_target = */ DRBD_C_DELAY_TARGET_DEF,
2956 /* .c_fill_target = */ DRBD_C_FILL_TARGET_DEF,
2957 /* .c_max_rate = */ DRBD_C_MAX_RATE_DEF,
2958 /* .c_min_rate = */ DRBD_C_MIN_RATE_DEF
2961 /* Have to use that way, because the layout differs between
2962 big endian and little endian */
2963 mdev->state = (union drbd_state) {
2964 { .role = R_SECONDARY,
2966 .conn = C_STANDALONE,
2975 void drbd_init_set_defaults(struct drbd_conf *mdev)
2977 /* the memset(,0,) did most of this.
2978 * note: only assignments, no allocation in here */
2980 drbd_set_defaults(mdev);
2982 atomic_set(&mdev->ap_bio_cnt, 0);
2983 atomic_set(&mdev->ap_pending_cnt, 0);
2984 atomic_set(&mdev->rs_pending_cnt, 0);
2985 atomic_set(&mdev->unacked_cnt, 0);
2986 atomic_set(&mdev->local_cnt, 0);
2987 atomic_set(&mdev->net_cnt, 0);
2988 atomic_set(&mdev->packet_seq, 0);
2989 atomic_set(&mdev->pp_in_use, 0);
2990 atomic_set(&mdev->pp_in_use_by_net, 0);
2991 atomic_set(&mdev->rs_sect_in, 0);
2992 atomic_set(&mdev->rs_sect_ev, 0);
2993 atomic_set(&mdev->ap_in_flight, 0);
2995 mutex_init(&mdev->md_io_mutex);
2996 mutex_init(&mdev->data.mutex);
2997 mutex_init(&mdev->meta.mutex);
2998 sema_init(&mdev->data.work.s, 0);
2999 sema_init(&mdev->meta.work.s, 0);
3000 mutex_init(&mdev->state_mutex);
3002 spin_lock_init(&mdev->data.work.q_lock);
3003 spin_lock_init(&mdev->meta.work.q_lock);
3005 spin_lock_init(&mdev->al_lock);
3006 spin_lock_init(&mdev->req_lock);
3007 spin_lock_init(&mdev->peer_seq_lock);
3008 spin_lock_init(&mdev->epoch_lock);
3010 INIT_LIST_HEAD(&mdev->active_ee);
3011 INIT_LIST_HEAD(&mdev->sync_ee);
3012 INIT_LIST_HEAD(&mdev->done_ee);
3013 INIT_LIST_HEAD(&mdev->read_ee);
3014 INIT_LIST_HEAD(&mdev->net_ee);
3015 INIT_LIST_HEAD(&mdev->resync_reads);
3016 INIT_LIST_HEAD(&mdev->data.work.q);
3017 INIT_LIST_HEAD(&mdev->meta.work.q);
3018 INIT_LIST_HEAD(&mdev->resync_work.list);
3019 INIT_LIST_HEAD(&mdev->unplug_work.list);
3020 INIT_LIST_HEAD(&mdev->go_diskless.list);
3021 INIT_LIST_HEAD(&mdev->md_sync_work.list);
3022 INIT_LIST_HEAD(&mdev->start_resync_work.list);
3023 INIT_LIST_HEAD(&mdev->bm_io_work.w.list);
3025 mdev->resync_work.cb = w_resync_timer;
3026 mdev->unplug_work.cb = w_send_write_hint;
3027 mdev->go_diskless.cb = w_go_diskless;
3028 mdev->md_sync_work.cb = w_md_sync;
3029 mdev->bm_io_work.w.cb = w_bitmap_io;
3030 mdev->start_resync_work.cb = w_start_resync;
3031 init_timer(&mdev->resync_timer);
3032 init_timer(&mdev->md_sync_timer);
3033 init_timer(&mdev->start_resync_timer);
3034 mdev->resync_timer.function = resync_timer_fn;
3035 mdev->resync_timer.data = (unsigned long) mdev;
3036 mdev->md_sync_timer.function = md_sync_timer_fn;
3037 mdev->md_sync_timer.data = (unsigned long) mdev;
3038 mdev->start_resync_timer.function = start_resync_timer_fn;
3039 mdev->start_resync_timer.data = (unsigned long) mdev;
3041 init_waitqueue_head(&mdev->misc_wait);
3042 init_waitqueue_head(&mdev->state_wait);
3043 init_waitqueue_head(&mdev->net_cnt_wait);
3044 init_waitqueue_head(&mdev->ee_wait);
3045 init_waitqueue_head(&mdev->al_wait);
3046 init_waitqueue_head(&mdev->seq_wait);
3048 drbd_thread_init(mdev, &mdev->receiver, drbdd_init);
3049 drbd_thread_init(mdev, &mdev->worker, drbd_worker);
3050 drbd_thread_init(mdev, &mdev->asender, drbd_asender);
3052 mdev->agreed_pro_version = PRO_VERSION_MAX;
3053 mdev->write_ordering = WO_bdev_flush;
3054 mdev->resync_wenr = LC_FREE;
3057 void drbd_mdev_cleanup(struct drbd_conf *mdev)
3060 if (mdev->receiver.t_state != None)
3061 dev_err(DEV, "ASSERT FAILED: receiver t_state == %d expected 0.\n",
3062 mdev->receiver.t_state);
3064 /* no need to lock it, I'm the only thread alive */
3065 if (atomic_read(&mdev->current_epoch->epoch_size) != 0)
3066 dev_err(DEV, "epoch_size:%d\n", atomic_read(&mdev->current_epoch->epoch_size));
3076 mdev->rs_failed = 0;
3077 mdev->rs_last_events = 0;
3078 mdev->rs_last_sect_ev = 0;
3079 for (i = 0; i < DRBD_SYNC_MARKS; i++) {
3080 mdev->rs_mark_left[i] = 0;
3081 mdev->rs_mark_time[i] = 0;
3083 D_ASSERT(mdev->net_conf == NULL);
3085 drbd_set_my_capacity(mdev, 0);
3087 /* maybe never allocated. */
3088 drbd_bm_resize(mdev, 0, 1);
3089 drbd_bm_cleanup(mdev);
3092 drbd_free_resources(mdev);
3093 clear_bit(AL_SUSPENDED, &mdev->flags);
3096 * currently we drbd_init_ee only on module load, so
3097 * we may do drbd_release_ee only on module unload!
3099 D_ASSERT(list_empty(&mdev->active_ee));
3100 D_ASSERT(list_empty(&mdev->sync_ee));
3101 D_ASSERT(list_empty(&mdev->done_ee));
3102 D_ASSERT(list_empty(&mdev->read_ee));
3103 D_ASSERT(list_empty(&mdev->net_ee));
3104 D_ASSERT(list_empty(&mdev->resync_reads));
3105 D_ASSERT(list_empty(&mdev->data.work.q));
3106 D_ASSERT(list_empty(&mdev->meta.work.q));
3107 D_ASSERT(list_empty(&mdev->resync_work.list));
3108 D_ASSERT(list_empty(&mdev->unplug_work.list));
3109 D_ASSERT(list_empty(&mdev->go_diskless.list));
3111 drbd_set_defaults(mdev);
3115 static void drbd_destroy_mempools(void)
3119 while (drbd_pp_pool) {
3120 page = drbd_pp_pool;
3121 drbd_pp_pool = (struct page *)page_private(page);
3126 /* D_ASSERT(atomic_read(&drbd_pp_vacant)==0); */
3128 if (drbd_ee_mempool)
3129 mempool_destroy(drbd_ee_mempool);
3130 if (drbd_request_mempool)
3131 mempool_destroy(drbd_request_mempool);
3133 kmem_cache_destroy(drbd_ee_cache);
3134 if (drbd_request_cache)
3135 kmem_cache_destroy(drbd_request_cache);
3136 if (drbd_bm_ext_cache)
3137 kmem_cache_destroy(drbd_bm_ext_cache);
3138 if (drbd_al_ext_cache)
3139 kmem_cache_destroy(drbd_al_ext_cache);
3141 drbd_ee_mempool = NULL;
3142 drbd_request_mempool = NULL;
3143 drbd_ee_cache = NULL;
3144 drbd_request_cache = NULL;
3145 drbd_bm_ext_cache = NULL;
3146 drbd_al_ext_cache = NULL;
3151 static int drbd_create_mempools(void)
3154 const int number = (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * minor_count;
3157 /* prepare our caches and mempools */
3158 drbd_request_mempool = NULL;
3159 drbd_ee_cache = NULL;
3160 drbd_request_cache = NULL;
3161 drbd_bm_ext_cache = NULL;
3162 drbd_al_ext_cache = NULL;
3163 drbd_pp_pool = NULL;
3166 drbd_request_cache = kmem_cache_create(
3167 "drbd_req", sizeof(struct drbd_request), 0, 0, NULL);
3168 if (drbd_request_cache == NULL)
3171 drbd_ee_cache = kmem_cache_create(
3172 "drbd_ee", sizeof(struct drbd_epoch_entry), 0, 0, NULL);
3173 if (drbd_ee_cache == NULL)
3176 drbd_bm_ext_cache = kmem_cache_create(
3177 "drbd_bm", sizeof(struct bm_extent), 0, 0, NULL);
3178 if (drbd_bm_ext_cache == NULL)
3181 drbd_al_ext_cache = kmem_cache_create(
3182 "drbd_al", sizeof(struct lc_element), 0, 0, NULL);
3183 if (drbd_al_ext_cache == NULL)
3187 drbd_request_mempool = mempool_create(number,
3188 mempool_alloc_slab, mempool_free_slab, drbd_request_cache);
3189 if (drbd_request_mempool == NULL)
3192 drbd_ee_mempool = mempool_create(number,
3193 mempool_alloc_slab, mempool_free_slab, drbd_ee_cache);
3194 if (drbd_ee_mempool == NULL)
3197 /* drbd's page pool */
3198 spin_lock_init(&drbd_pp_lock);
3200 for (i = 0; i < number; i++) {
3201 page = alloc_page(GFP_HIGHUSER);
3204 set_page_private(page, (unsigned long)drbd_pp_pool);
3205 drbd_pp_pool = page;
3207 drbd_pp_vacant = number;
3212 drbd_destroy_mempools(); /* in case we allocated some */
3216 static int drbd_notify_sys(struct notifier_block *this, unsigned long code,
3219 /* just so we have it. you never know what interesting things we
3220 * might want to do here some day...
3226 static struct notifier_block drbd_notifier = {
3227 .notifier_call = drbd_notify_sys,
3230 static void drbd_release_ee_lists(struct drbd_conf *mdev)
3234 rr = drbd_release_ee(mdev, &mdev->active_ee);
3236 dev_err(DEV, "%d EEs in active list found!\n", rr);
3238 rr = drbd_release_ee(mdev, &mdev->sync_ee);
3240 dev_err(DEV, "%d EEs in sync list found!\n", rr);
3242 rr = drbd_release_ee(mdev, &mdev->read_ee);
3244 dev_err(DEV, "%d EEs in read list found!\n", rr);
3246 rr = drbd_release_ee(mdev, &mdev->done_ee);
3248 dev_err(DEV, "%d EEs in done list found!\n", rr);
3250 rr = drbd_release_ee(mdev, &mdev->net_ee);
3252 dev_err(DEV, "%d EEs in net list found!\n", rr);
3255 /* caution. no locking.
3256 * currently only used from module cleanup code. */
3257 static void drbd_delete_device(unsigned int minor)
3259 struct drbd_conf *mdev = minor_to_mdev(minor);
3264 /* paranoia asserts */
3265 if (mdev->open_cnt != 0)
3266 dev_err(DEV, "open_cnt = %d in %s:%u", mdev->open_cnt,
3267 __FILE__ , __LINE__);
3269 ERR_IF (!list_empty(&mdev->data.work.q)) {
3270 struct list_head *lp;
3271 list_for_each(lp, &mdev->data.work.q) {
3272 dev_err(DEV, "lp = %p\n", lp);
3275 /* end paranoia asserts */
3277 del_gendisk(mdev->vdisk);
3279 /* cleanup stuff that may have been allocated during
3280 * device (re-)configuration or state changes */
3282 if (mdev->this_bdev)
3283 bdput(mdev->this_bdev);
3285 drbd_free_resources(mdev);
3287 drbd_release_ee_lists(mdev);
3289 /* should be free'd on disconnect? */
3290 kfree(mdev->ee_hash);
3292 mdev->ee_hash_s = 0;
3293 mdev->ee_hash = NULL;
3296 lc_destroy(mdev->act_log);
3297 lc_destroy(mdev->resync);
3299 kfree(mdev->p_uuid);
3300 /* mdev->p_uuid = NULL; */
3302 kfree(mdev->int_dig_out);
3303 kfree(mdev->int_dig_in);
3304 kfree(mdev->int_dig_vv);
3306 /* cleanup the rest that has been
3307 * allocated from drbd_new_device
3308 * and actually free the mdev itself */
3309 drbd_free_mdev(mdev);
3312 static void drbd_cleanup(void)
3316 unregister_reboot_notifier(&drbd_notifier);
3318 /* first remove proc,
3319 * drbdsetup uses it's presence to detect
3320 * whether DRBD is loaded.
3321 * If we would get stuck in proc removal,
3322 * but have netlink already deregistered,
3323 * some drbdsetup commands may wait forever
3327 remove_proc_entry("drbd", NULL);
3334 drbd_delete_device(i);
3335 drbd_destroy_mempools();
3340 unregister_blkdev(DRBD_MAJOR, "drbd");
3342 printk(KERN_INFO "drbd: module cleanup done.\n");
3346 * drbd_congested() - Callback for pdflush
3347 * @congested_data: User data
3348 * @bdi_bits: Bits pdflush is currently interested in
3350 * Returns 1<<BDI_async_congested and/or 1<<BDI_sync_congested if we are congested.
3352 static int drbd_congested(void *congested_data, int bdi_bits)
3354 struct drbd_conf *mdev = congested_data;
3355 struct request_queue *q;
3359 if (!may_inc_ap_bio(mdev)) {
3360 /* DRBD has frozen IO */
3366 if (get_ldev(mdev)) {
3367 q = bdev_get_queue(mdev->ldev->backing_bdev);
3368 r = bdi_congested(&q->backing_dev_info, bdi_bits);
3374 if (bdi_bits & (1 << BDI_async_congested) && test_bit(NET_CONGESTED, &mdev->flags)) {
3375 r |= (1 << BDI_async_congested);
3376 reason = reason == 'b' ? 'a' : 'n';
3380 mdev->congestion_reason = reason;
3384 struct drbd_conf *drbd_new_device(unsigned int minor)
3386 struct drbd_conf *mdev;
3387 struct gendisk *disk;
3388 struct request_queue *q;
3390 /* GFP_KERNEL, we are outside of all write-out paths */
3391 mdev = kzalloc(sizeof(struct drbd_conf), GFP_KERNEL);
3394 if (!zalloc_cpumask_var(&mdev->cpu_mask, GFP_KERNEL))
3395 goto out_no_cpumask;
3397 mdev->minor = minor;
3399 drbd_init_set_defaults(mdev);
3401 q = blk_alloc_queue(GFP_KERNEL);
3405 q->queuedata = mdev;
3407 disk = alloc_disk(1);
3412 set_disk_ro(disk, true);
3415 disk->major = DRBD_MAJOR;
3416 disk->first_minor = minor;
3417 disk->fops = &drbd_ops;
3418 sprintf(disk->disk_name, "drbd%d", minor);
3419 disk->private_data = mdev;
3421 mdev->this_bdev = bdget(MKDEV(DRBD_MAJOR, minor));
3422 /* we have no partitions. we contain only ourselves. */
3423 mdev->this_bdev->bd_contains = mdev->this_bdev;
3425 q->backing_dev_info.congested_fn = drbd_congested;
3426 q->backing_dev_info.congested_data = mdev;
3428 blk_queue_make_request(q, drbd_make_request);
3429 blk_queue_max_hw_sectors(q, DRBD_MAX_BIO_SIZE >> 9);
3430 blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
3431 blk_queue_merge_bvec(q, drbd_merge_bvec);
3432 q->queue_lock = &mdev->req_lock;
3434 mdev->md_io_page = alloc_page(GFP_KERNEL);
3435 if (!mdev->md_io_page)
3436 goto out_no_io_page;
3438 if (drbd_bm_init(mdev))
3440 /* no need to lock access, we are still initializing this minor device. */
3444 mdev->app_reads_hash = kzalloc(APP_R_HSIZE*sizeof(void *), GFP_KERNEL);
3445 if (!mdev->app_reads_hash)
3446 goto out_no_app_reads;
3448 mdev->current_epoch = kzalloc(sizeof(struct drbd_epoch), GFP_KERNEL);
3449 if (!mdev->current_epoch)
3452 INIT_LIST_HEAD(&mdev->current_epoch->list);
3457 /* out_whatever_else:
3458 kfree(mdev->current_epoch); */
3460 kfree(mdev->app_reads_hash);
3464 drbd_bm_cleanup(mdev);
3466 __free_page(mdev->md_io_page);
3470 blk_cleanup_queue(q);
3472 free_cpumask_var(mdev->cpu_mask);
3478 /* counterpart of drbd_new_device.
3479 * last part of drbd_delete_device. */
3480 void drbd_free_mdev(struct drbd_conf *mdev)
3482 kfree(mdev->current_epoch);
3483 kfree(mdev->app_reads_hash);
3485 if (mdev->bitmap) /* should no longer be there. */
3486 drbd_bm_cleanup(mdev);
3487 __free_page(mdev->md_io_page);
3488 put_disk(mdev->vdisk);
3489 blk_cleanup_queue(mdev->rq_queue);
3490 free_cpumask_var(mdev->cpu_mask);
3491 drbd_free_tl_hash(mdev);
3496 int __init drbd_init(void)
3500 if (sizeof(struct p_handshake) != 80) {
3502 "drbd: never change the size or layout "
3503 "of the HandShake packet.\n");
3507 if (minor_count < DRBD_MINOR_COUNT_MIN || minor_count > DRBD_MINOR_COUNT_MAX) {
3509 "drbd: invalid minor_count (%d)\n", minor_count);
3517 err = drbd_nl_init();
3521 err = register_blkdev(DRBD_MAJOR, "drbd");
3524 "drbd: unable to register block device major %d\n",
3529 register_reboot_notifier(&drbd_notifier);
3532 * allocate all necessary structs
3536 init_waitqueue_head(&drbd_pp_wait);
3538 drbd_proc = NULL; /* play safe for drbd_cleanup */
3539 minor_table = kzalloc(sizeof(struct drbd_conf *)*minor_count,
3544 err = drbd_create_mempools();
3548 drbd_proc = proc_create_data("drbd", S_IFREG | S_IRUGO , NULL, &drbd_proc_fops, NULL);
3550 printk(KERN_ERR "drbd: unable to register proc file\n");
3554 rwlock_init(&global_state_lock);
3556 printk(KERN_INFO "drbd: initialized. "
3557 "Version: " REL_VERSION " (api:%d/proto:%d-%d)\n",
3558 API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX);
3559 printk(KERN_INFO "drbd: %s\n", drbd_buildtag());
3560 printk(KERN_INFO "drbd: registered as block device major %d\n",
3562 printk(KERN_INFO "drbd: minor_table @ 0x%p\n", minor_table);
3564 return 0; /* Success! */
3569 /* currently always the case */
3570 printk(KERN_ERR "drbd: ran out of memory\n");
3572 printk(KERN_ERR "drbd: initialization failure\n");
3576 void drbd_free_bc(struct drbd_backing_dev *ldev)
3581 blkdev_put(ldev->backing_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
3582 blkdev_put(ldev->md_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
3587 void drbd_free_sock(struct drbd_conf *mdev)
3589 if (mdev->data.socket) {
3590 mutex_lock(&mdev->data.mutex);
3591 kernel_sock_shutdown(mdev->data.socket, SHUT_RDWR);
3592 sock_release(mdev->data.socket);
3593 mdev->data.socket = NULL;
3594 mutex_unlock(&mdev->data.mutex);
3596 if (mdev->meta.socket) {
3597 mutex_lock(&mdev->meta.mutex);
3598 kernel_sock_shutdown(mdev->meta.socket, SHUT_RDWR);
3599 sock_release(mdev->meta.socket);
3600 mdev->meta.socket = NULL;
3601 mutex_unlock(&mdev->meta.mutex);
3606 void drbd_free_resources(struct drbd_conf *mdev)
3608 crypto_free_hash(mdev->csums_tfm);
3609 mdev->csums_tfm = NULL;
3610 crypto_free_hash(mdev->verify_tfm);
3611 mdev->verify_tfm = NULL;
3612 crypto_free_hash(mdev->cram_hmac_tfm);
3613 mdev->cram_hmac_tfm = NULL;
3614 crypto_free_hash(mdev->integrity_w_tfm);
3615 mdev->integrity_w_tfm = NULL;
3616 crypto_free_hash(mdev->integrity_r_tfm);
3617 mdev->integrity_r_tfm = NULL;
3619 drbd_free_sock(mdev);
3622 drbd_free_bc(mdev->ldev);
3623 mdev->ldev = NULL;);
3626 /* meta data management */
3628 struct meta_data_on_disk {
3629 u64 la_size; /* last agreed size. */
3630 u64 uuid[UI_SIZE]; /* UUIDs. */
3633 u32 flags; /* MDF */
3636 u32 al_offset; /* offset to this block */
3637 u32 al_nr_extents; /* important for restoring the AL */
3638 /* `-- act_log->nr_elements <-- sync_conf.al_extents */
3639 u32 bm_offset; /* offset to the bitmap, from here */
3640 u32 bm_bytes_per_bit; /* BM_BLOCK_SIZE */
3641 u32 reserved_u32[4];
3646 * drbd_md_sync() - Writes the meta data super block if the MD_DIRTY flag bit is set
3647 * @mdev: DRBD device.
3649 void drbd_md_sync(struct drbd_conf *mdev)
3651 struct meta_data_on_disk *buffer;
3655 del_timer(&mdev->md_sync_timer);
3656 /* timer may be rearmed by drbd_md_mark_dirty() now. */
3657 if (!test_and_clear_bit(MD_DIRTY, &mdev->flags))
3660 /* We use here D_FAILED and not D_ATTACHING because we try to write
3661 * metadata even if we detach due to a disk failure! */
3662 if (!get_ldev_if_state(mdev, D_FAILED))
3665 mutex_lock(&mdev->md_io_mutex);
3666 buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);
3667 memset(buffer, 0, 512);
3669 buffer->la_size = cpu_to_be64(drbd_get_capacity(mdev->this_bdev));
3670 for (i = UI_CURRENT; i < UI_SIZE; i++)
3671 buffer->uuid[i] = cpu_to_be64(mdev->ldev->md.uuid[i]);
3672 buffer->flags = cpu_to_be32(mdev->ldev->md.flags);
3673 buffer->magic = cpu_to_be32(DRBD_MD_MAGIC);
3675 buffer->md_size_sect = cpu_to_be32(mdev->ldev->md.md_size_sect);
3676 buffer->al_offset = cpu_to_be32(mdev->ldev->md.al_offset);
3677 buffer->al_nr_extents = cpu_to_be32(mdev->act_log->nr_elements);
3678 buffer->bm_bytes_per_bit = cpu_to_be32(BM_BLOCK_SIZE);
3679 buffer->device_uuid = cpu_to_be64(mdev->ldev->md.device_uuid);
3681 buffer->bm_offset = cpu_to_be32(mdev->ldev->md.bm_offset);
3683 D_ASSERT(drbd_md_ss__(mdev, mdev->ldev) == mdev->ldev->md.md_offset);
3684 sector = mdev->ldev->md.md_offset;
3686 if (!drbd_md_sync_page_io(mdev, mdev->ldev, sector, WRITE)) {
3687 /* this was a try anyways ... */
3688 dev_err(DEV, "meta data update failed!\n");
3689 drbd_chk_io_error(mdev, 1, true);
3692 /* Update mdev->ldev->md.la_size_sect,
3693 * since we updated it on metadata. */
3694 mdev->ldev->md.la_size_sect = drbd_get_capacity(mdev->this_bdev);
3696 mutex_unlock(&mdev->md_io_mutex);
3701 * drbd_md_read() - Reads in the meta data super block
3702 * @mdev: DRBD device.
3703 * @bdev: Device from which the meta data should be read in.
3705 * Return 0 (NO_ERROR) on success, and an enum drbd_ret_code in case
3706 * something goes wrong. Currently only: ERR_IO_MD_DISK, ERR_MD_INVALID.
3708 int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
3710 struct meta_data_on_disk *buffer;
3711 int i, rv = NO_ERROR;
3713 if (!get_ldev_if_state(mdev, D_ATTACHING))
3714 return ERR_IO_MD_DISK;
3716 mutex_lock(&mdev->md_io_mutex);
3717 buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);
3719 if (!drbd_md_sync_page_io(mdev, bdev, bdev->md.md_offset, READ)) {
3720 /* NOTE: cant do normal error processing here as this is
3721 called BEFORE disk is attached */
3722 dev_err(DEV, "Error while reading metadata.\n");
3723 rv = ERR_IO_MD_DISK;
3727 if (be32_to_cpu(buffer->magic) != DRBD_MD_MAGIC) {
3728 dev_err(DEV, "Error while reading metadata, magic not found.\n");
3729 rv = ERR_MD_INVALID;
3732 if (be32_to_cpu(buffer->al_offset) != bdev->md.al_offset) {
3733 dev_err(DEV, "unexpected al_offset: %d (expected %d)\n",
3734 be32_to_cpu(buffer->al_offset), bdev->md.al_offset);
3735 rv = ERR_MD_INVALID;
3738 if (be32_to_cpu(buffer->bm_offset) != bdev->md.bm_offset) {
3739 dev_err(DEV, "unexpected bm_offset: %d (expected %d)\n",
3740 be32_to_cpu(buffer->bm_offset), bdev->md.bm_offset);
3741 rv = ERR_MD_INVALID;
3744 if (be32_to_cpu(buffer->md_size_sect) != bdev->md.md_size_sect) {
3745 dev_err(DEV, "unexpected md_size: %u (expected %u)\n",
3746 be32_to_cpu(buffer->md_size_sect), bdev->md.md_size_sect);
3747 rv = ERR_MD_INVALID;
3751 if (be32_to_cpu(buffer->bm_bytes_per_bit) != BM_BLOCK_SIZE) {
3752 dev_err(DEV, "unexpected bm_bytes_per_bit: %u (expected %u)\n",
3753 be32_to_cpu(buffer->bm_bytes_per_bit), BM_BLOCK_SIZE);
3754 rv = ERR_MD_INVALID;
3758 bdev->md.la_size_sect = be64_to_cpu(buffer->la_size);
3759 for (i = UI_CURRENT; i < UI_SIZE; i++)
3760 bdev->md.uuid[i] = be64_to_cpu(buffer->uuid[i]);
3761 bdev->md.flags = be32_to_cpu(buffer->flags);
3762 mdev->sync_conf.al_extents = be32_to_cpu(buffer->al_nr_extents);
3763 bdev->md.device_uuid = be64_to_cpu(buffer->device_uuid);
3765 if (mdev->sync_conf.al_extents < 7)
3766 mdev->sync_conf.al_extents = 127;
3769 mutex_unlock(&mdev->md_io_mutex);
3776 * drbd_md_mark_dirty() - Mark meta data super block as dirty
3777 * @mdev: DRBD device.
3779 * Call this function if you change anything that should be written to
3780 * the meta-data super block. This function sets MD_DIRTY, and starts a
3781 * timer that ensures that within five seconds you have to call drbd_md_sync().
3784 void drbd_md_mark_dirty_(struct drbd_conf *mdev, unsigned int line, const char *func)
3786 if (!test_and_set_bit(MD_DIRTY, &mdev->flags)) {
3787 mod_timer(&mdev->md_sync_timer, jiffies + HZ);
3788 mdev->last_md_mark_dirty.line = line;
3789 mdev->last_md_mark_dirty.func = func;
3793 void drbd_md_mark_dirty(struct drbd_conf *mdev)
3795 if (!test_and_set_bit(MD_DIRTY, &mdev->flags))
3796 mod_timer(&mdev->md_sync_timer, jiffies + 5*HZ);
3800 static void drbd_uuid_move_history(struct drbd_conf *mdev) __must_hold(local)
3804 for (i = UI_HISTORY_START; i < UI_HISTORY_END; i++)
3805 mdev->ldev->md.uuid[i+1] = mdev->ldev->md.uuid[i];
3808 void _drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local)
3810 if (idx == UI_CURRENT) {
3811 if (mdev->state.role == R_PRIMARY)
3816 drbd_set_ed_uuid(mdev, val);
3819 mdev->ldev->md.uuid[idx] = val;
3820 drbd_md_mark_dirty(mdev);
3824 void drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local)
3826 if (mdev->ldev->md.uuid[idx]) {
3827 drbd_uuid_move_history(mdev);
3828 mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[idx];
3830 _drbd_uuid_set(mdev, idx, val);
3834 * drbd_uuid_new_current() - Creates a new current UUID
3835 * @mdev: DRBD device.
3837 * Creates a new current UUID, and rotates the old current UUID into
3838 * the bitmap slot. Causes an incremental resync upon next connect.
3840 void drbd_uuid_new_current(struct drbd_conf *mdev) __must_hold(local)
3843 unsigned long long bm_uuid = mdev->ldev->md.uuid[UI_BITMAP];
3846 dev_warn(DEV, "bm UUID was already set: %llX\n", bm_uuid);
3848 mdev->ldev->md.uuid[UI_BITMAP] = mdev->ldev->md.uuid[UI_CURRENT];
3850 get_random_bytes(&val, sizeof(u64));
3851 _drbd_uuid_set(mdev, UI_CURRENT, val);
3852 drbd_print_uuids(mdev, "new current UUID");
3853 /* get it to stable storage _now_ */
3857 void drbd_uuid_set_bm(struct drbd_conf *mdev, u64 val) __must_hold(local)
3859 if (mdev->ldev->md.uuid[UI_BITMAP] == 0 && val == 0)
3863 drbd_uuid_move_history(mdev);
3864 mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[UI_BITMAP];
3865 mdev->ldev->md.uuid[UI_BITMAP] = 0;
3867 unsigned long long bm_uuid = mdev->ldev->md.uuid[UI_BITMAP];
3869 dev_warn(DEV, "bm UUID was already set: %llX\n", bm_uuid);
3871 mdev->ldev->md.uuid[UI_BITMAP] = val & ~((u64)1);
3873 drbd_md_mark_dirty(mdev);
3877 * drbd_bmio_set_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
3878 * @mdev: DRBD device.
3880 * Sets all bits in the bitmap and writes the whole bitmap to stable storage.
3882 int drbd_bmio_set_n_write(struct drbd_conf *mdev)
3886 if (get_ldev_if_state(mdev, D_ATTACHING)) {
3887 drbd_md_set_flag(mdev, MDF_FULL_SYNC);
3889 drbd_bm_set_all(mdev);
3891 rv = drbd_bm_write(mdev);
3894 drbd_md_clear_flag(mdev, MDF_FULL_SYNC);
3905 * drbd_bmio_clear_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
3906 * @mdev: DRBD device.
3908 * Clears all bits in the bitmap and writes the whole bitmap to stable storage.
3910 int drbd_bmio_clear_n_write(struct drbd_conf *mdev)
3914 drbd_resume_al(mdev);
3915 if (get_ldev_if_state(mdev, D_ATTACHING)) {
3916 drbd_bm_clear_all(mdev);
3917 rv = drbd_bm_write(mdev);
3924 static int w_bitmap_io(struct drbd_conf *mdev, struct drbd_work *w, int unused)
3926 struct bm_io_work *work = container_of(w, struct bm_io_work, w);
3929 D_ASSERT(atomic_read(&mdev->ap_bio_cnt) == 0);
3931 if (get_ldev(mdev)) {
3932 drbd_bm_lock(mdev, work->why);
3933 rv = work->io_fn(mdev);
3934 drbd_bm_unlock(mdev);
3938 clear_bit(BITMAP_IO, &mdev->flags);
3939 smp_mb__after_clear_bit();
3940 wake_up(&mdev->misc_wait);
3943 work->done(mdev, rv);
3945 clear_bit(BITMAP_IO_QUEUED, &mdev->flags);
3951 void drbd_ldev_destroy(struct drbd_conf *mdev)
3953 lc_destroy(mdev->resync);
3954 mdev->resync = NULL;
3955 lc_destroy(mdev->act_log);
3956 mdev->act_log = NULL;
3958 drbd_free_bc(mdev->ldev);
3959 mdev->ldev = NULL;);
3961 if (mdev->md_io_tmpp) {
3962 __free_page(mdev->md_io_tmpp);
3963 mdev->md_io_tmpp = NULL;
3965 clear_bit(GO_DISKLESS, &mdev->flags);
3968 static int w_go_diskless(struct drbd_conf *mdev, struct drbd_work *w, int unused)
3970 D_ASSERT(mdev->state.disk == D_FAILED);
3971 /* we cannot assert local_cnt == 0 here, as get_ldev_if_state will
3972 * inc/dec it frequently. Once we are D_DISKLESS, no one will touch
3973 * the protected members anymore, though, so once put_ldev reaches zero
3974 * again, it will be safe to free them. */
3975 drbd_force_state(mdev, NS(disk, D_DISKLESS));
3979 void drbd_go_diskless(struct drbd_conf *mdev)
3981 D_ASSERT(mdev->state.disk == D_FAILED);
3982 if (!test_and_set_bit(GO_DISKLESS, &mdev->flags))
3983 drbd_queue_work(&mdev->data.work, &mdev->go_diskless);
3987 * drbd_queue_bitmap_io() - Queues an IO operation on the whole bitmap
3988 * @mdev: DRBD device.
3989 * @io_fn: IO callback to be called when bitmap IO is possible
3990 * @done: callback to be called after the bitmap IO was performed
3991 * @why: Descriptive text of the reason for doing the IO
3993 * While IO on the bitmap happens we freeze application IO thus we ensure
3994 * that drbd_set_out_of_sync() can not be called. This function MAY ONLY be
3995 * called from worker context. It MUST NOT be used while a previous such
3996 * work is still pending!
3998 void drbd_queue_bitmap_io(struct drbd_conf *mdev,
3999 int (*io_fn)(struct drbd_conf *),
4000 void (*done)(struct drbd_conf *, int),
4003 D_ASSERT(current == mdev->worker.task);
4005 D_ASSERT(!test_bit(BITMAP_IO_QUEUED, &mdev->flags));
4006 D_ASSERT(!test_bit(BITMAP_IO, &mdev->flags));
4007 D_ASSERT(list_empty(&mdev->bm_io_work.w.list));
4008 if (mdev->bm_io_work.why)
4009 dev_err(DEV, "FIXME going to queue '%s' but '%s' still pending?\n",
4010 why, mdev->bm_io_work.why);
4012 mdev->bm_io_work.io_fn = io_fn;
4013 mdev->bm_io_work.done = done;
4014 mdev->bm_io_work.why = why;
4016 spin_lock_irq(&mdev->req_lock);
4017 set_bit(BITMAP_IO, &mdev->flags);
4018 if (atomic_read(&mdev->ap_bio_cnt) == 0) {
4019 if (!test_and_set_bit(BITMAP_IO_QUEUED, &mdev->flags))
4020 drbd_queue_work(&mdev->data.work, &mdev->bm_io_work.w);
4022 spin_unlock_irq(&mdev->req_lock);
4026 * drbd_bitmap_io() - Does an IO operation on the whole bitmap
4027 * @mdev: DRBD device.
4028 * @io_fn: IO callback to be called when bitmap IO is possible
4029 * @why: Descriptive text of the reason for doing the IO
4031 * freezes application IO while that the actual IO operations runs. This
4032 * functions MAY NOT be called from worker context.
4034 int drbd_bitmap_io(struct drbd_conf *mdev, int (*io_fn)(struct drbd_conf *), char *why)
4038 D_ASSERT(current != mdev->worker.task);
4040 drbd_suspend_io(mdev);
4042 drbd_bm_lock(mdev, why);
4044 drbd_bm_unlock(mdev);
4046 drbd_resume_io(mdev);
4051 void drbd_md_set_flag(struct drbd_conf *mdev, int flag) __must_hold(local)
4053 if ((mdev->ldev->md.flags & flag) != flag) {
4054 drbd_md_mark_dirty(mdev);
4055 mdev->ldev->md.flags |= flag;
4059 void drbd_md_clear_flag(struct drbd_conf *mdev, int flag) __must_hold(local)
4061 if ((mdev->ldev->md.flags & flag) != 0) {
4062 drbd_md_mark_dirty(mdev);
4063 mdev->ldev->md.flags &= ~flag;
4066 int drbd_md_test_flag(struct drbd_backing_dev *bdev, int flag)
4068 return (bdev->md.flags & flag) != 0;
4071 static void md_sync_timer_fn(unsigned long data)
4073 struct drbd_conf *mdev = (struct drbd_conf *) data;
4075 drbd_queue_work_front(&mdev->data.work, &mdev->md_sync_work);
4078 static int w_md_sync(struct drbd_conf *mdev, struct drbd_work *w, int unused)
4080 dev_warn(DEV, "md_sync_timer expired! Worker calls drbd_md_sync().\n");
4082 dev_warn(DEV, "last md_mark_dirty: %s:%u\n",
4083 mdev->last_md_mark_dirty.func, mdev->last_md_mark_dirty.line);
4089 #ifdef CONFIG_DRBD_FAULT_INJECTION
4090 /* Fault insertion support including random number generator shamelessly
4091 * stolen from kernel/rcutorture.c */
4092 struct fault_random_state {
4093 unsigned long state;
4094 unsigned long count;
4097 #define FAULT_RANDOM_MULT 39916801 /* prime */
4098 #define FAULT_RANDOM_ADD 479001701 /* prime */
4099 #define FAULT_RANDOM_REFRESH 10000
4102 * Crude but fast random-number generator. Uses a linear congruential
4103 * generator, with occasional help from get_random_bytes().
4105 static unsigned long
4106 _drbd_fault_random(struct fault_random_state *rsp)
4110 if (!rsp->count--) {
4111 get_random_bytes(&refresh, sizeof(refresh));
4112 rsp->state += refresh;
4113 rsp->count = FAULT_RANDOM_REFRESH;
4115 rsp->state = rsp->state * FAULT_RANDOM_MULT + FAULT_RANDOM_ADD;
4116 return swahw32(rsp->state);
4120 _drbd_fault_str(unsigned int type) {
4121 static char *_faults[] = {
4122 [DRBD_FAULT_MD_WR] = "Meta-data write",
4123 [DRBD_FAULT_MD_RD] = "Meta-data read",
4124 [DRBD_FAULT_RS_WR] = "Resync write",
4125 [DRBD_FAULT_RS_RD] = "Resync read",
4126 [DRBD_FAULT_DT_WR] = "Data write",
4127 [DRBD_FAULT_DT_RD] = "Data read",
4128 [DRBD_FAULT_DT_RA] = "Data read ahead",
4129 [DRBD_FAULT_BM_ALLOC] = "BM allocation",
4130 [DRBD_FAULT_AL_EE] = "EE allocation",
4131 [DRBD_FAULT_RECEIVE] = "receive data corruption",
4134 return (type < DRBD_FAULT_MAX) ? _faults[type] : "**Unknown**";
4138 _drbd_insert_fault(struct drbd_conf *mdev, unsigned int type)
4140 static struct fault_random_state rrs = {0, 0};
4142 unsigned int ret = (
4144 ((1 << mdev_to_minor(mdev)) & fault_devs) != 0) &&
4145 (((_drbd_fault_random(&rrs) % 100) + 1) <= fault_rate));
4150 if (__ratelimit(&drbd_ratelimit_state))
4151 dev_warn(DEV, "***Simulating %s failure\n",
4152 _drbd_fault_str(type));
4159 const char *drbd_buildtag(void)
4161 /* DRBD built from external sources has here a reference to the
4162 git hash of the source code. */
4164 static char buildtag[38] = "\0uilt-in";
4166 if (buildtag[0] == 0) {
4167 #ifdef CONFIG_MODULES
4168 if (THIS_MODULE != NULL)
4169 sprintf(buildtag, "srcversion: %-24s", THIS_MODULE->srcversion);
4178 module_init(drbd_init)
4179 module_exit(drbd_cleanup)
4181 EXPORT_SYMBOL(drbd_conn_str);
4182 EXPORT_SYMBOL(drbd_role_str);
4183 EXPORT_SYMBOL(drbd_disk_str);
4184 EXPORT_SYMBOL(drbd_set_st_err_str);