4 This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
6 Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
7 Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
8 Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
10 Thanks to Carter Burden, Bart Grantham and Gennadiy Nerubayev
11 from Logicworks, Inc. for making SDP replication support possible.
13 drbd is free software; you can redistribute it and/or modify
14 it under the terms of the GNU General Public License as published by
15 the Free Software Foundation; either version 2, or (at your option)
18 drbd is distributed in the hope that it will be useful,
19 but WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 GNU General Public License for more details.
23 You should have received a copy of the GNU General Public License
24 along with drbd; see the file COPYING. If not, write to
25 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
29 #include <linux/module.h>
30 #include <linux/drbd.h>
31 #include <asm/uaccess.h>
32 #include <asm/types.h>
34 #include <linux/ctype.h>
35 #include <linux/mutex.h>
37 #include <linux/file.h>
38 #include <linux/proc_fs.h>
39 #include <linux/init.h>
41 #include <linux/memcontrol.h>
42 #include <linux/mm_inline.h>
43 #include <linux/slab.h>
44 #include <linux/random.h>
45 #include <linux/reboot.h>
46 #include <linux/notifier.h>
47 #include <linux/kthread.h>
49 #define __KERNEL_SYSCALLS__
50 #include <linux/unistd.h>
51 #include <linux/vmalloc.h>
53 #include <linux/drbd_limits.h>
55 #include "drbd_req.h" /* only for _req_mod in tl_release and tl_clear */
59 struct after_state_chg_work {
63 enum chg_state_flags flags;
64 struct completion *done;
67 static DEFINE_MUTEX(drbd_main_mutex);
68 int drbdd_init(struct drbd_thread *);
69 int drbd_worker(struct drbd_thread *);
70 int drbd_asender(struct drbd_thread *);
73 static int drbd_open(struct block_device *bdev, fmode_t mode);
74 static int drbd_release(struct gendisk *gd, fmode_t mode);
75 static int w_after_state_ch(struct drbd_conf *mdev, struct drbd_work *w, int unused);
76 static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
77 union drbd_state ns, enum chg_state_flags flags);
78 static int w_md_sync(struct drbd_conf *mdev, struct drbd_work *w, int unused);
79 static void md_sync_timer_fn(unsigned long data);
80 static int w_bitmap_io(struct drbd_conf *mdev, struct drbd_work *w, int unused);
81 static int w_go_diskless(struct drbd_conf *mdev, struct drbd_work *w, int unused);
83 MODULE_AUTHOR("Philipp Reisner <phil@linbit.com>, "
84 "Lars Ellenberg <lars@linbit.com>");
85 MODULE_DESCRIPTION("drbd - Distributed Replicated Block Device v" REL_VERSION);
86 MODULE_VERSION(REL_VERSION);
87 MODULE_LICENSE("GPL");
88 MODULE_PARM_DESC(minor_count, "Maximum number of drbd devices ("
89 __stringify(DRBD_MINOR_COUNT_MIN) "-" __stringify(DRBD_MINOR_COUNT_MAX) ")");
90 MODULE_ALIAS_BLOCKDEV_MAJOR(DRBD_MAJOR);
92 #include <linux/moduleparam.h>
93 /* allow_open_on_secondary */
94 MODULE_PARM_DESC(allow_oos, "DONT USE!");
95 /* thanks to these macros, if compiled into the kernel (not-module),
96 * this becomes the boot parameter drbd.minor_count */
97 module_param(minor_count, uint, 0444);
98 module_param(disable_sendpage, bool, 0644);
99 module_param(allow_oos, bool, 0);
100 module_param(cn_idx, uint, 0444);
101 module_param(proc_details, int, 0644);
103 #ifdef CONFIG_DRBD_FAULT_INJECTION
106 static int fault_count;
108 /* bitmap of enabled faults */
109 module_param(enable_faults, int, 0664);
110 /* fault rate % value - applies to all enabled faults */
111 module_param(fault_rate, int, 0664);
112 /* count of faults inserted */
113 module_param(fault_count, int, 0664);
114 /* bitmap of devices to insert faults on */
115 module_param(fault_devs, int, 0644);
118 /* module parameter, defined */
119 unsigned int minor_count = DRBD_MINOR_COUNT_DEF;
120 int disable_sendpage;
122 unsigned int cn_idx = CN_IDX_DRBD;
123 int proc_details; /* Detail level in proc drbd*/
125 /* Module parameter for setting the user mode helper program
126 * to run. Default is /sbin/drbdadm */
127 char usermode_helper[80] = "/sbin/drbdadm";
129 module_param_string(usermode_helper, usermode_helper, sizeof(usermode_helper), 0644);
131 /* in 2.6.x, our device mapping and config info contains our virtual gendisks
132 * as member "struct gendisk *vdisk;"
134 struct drbd_conf **minor_table;
136 struct kmem_cache *drbd_request_cache;
137 struct kmem_cache *drbd_ee_cache; /* epoch entries */
138 struct kmem_cache *drbd_bm_ext_cache; /* bitmap extents */
139 struct kmem_cache *drbd_al_ext_cache; /* activity log extents */
140 mempool_t *drbd_request_mempool;
141 mempool_t *drbd_ee_mempool;
143 /* I do not use a standard mempool, because:
144 1) I want to hand out the pre-allocated objects first.
145 2) I want to be able to interrupt sleeping allocation with a signal.
146 Note: This is a single linked list, the next pointer is the private
147 member of struct page.
149 struct page *drbd_pp_pool;
150 spinlock_t drbd_pp_lock;
152 wait_queue_head_t drbd_pp_wait;
154 DEFINE_RATELIMIT_STATE(drbd_ratelimit_state, 5 * HZ, 5);
156 static const struct block_device_operations drbd_ops = {
157 .owner = THIS_MODULE,
159 .release = drbd_release,
162 #define ARRY_SIZE(A) (sizeof(A)/sizeof(A[0]))
165 /* When checking with sparse, and this is an inline function, sparse will
166 give tons of false positives. When this is a real functions sparse works.
168 int _get_ldev_if_state(struct drbd_conf *mdev, enum drbd_disk_state mins)
172 atomic_inc(&mdev->local_cnt);
173 io_allowed = (mdev->state.disk >= mins);
175 if (atomic_dec_and_test(&mdev->local_cnt))
176 wake_up(&mdev->misc_wait);
184 * DOC: The transfer log
186 * The transfer log is a single linked list of &struct drbd_tl_epoch objects.
187 * mdev->newest_tle points to the head, mdev->oldest_tle points to the tail
188 * of the list. There is always at least one &struct drbd_tl_epoch object.
190 * Each &struct drbd_tl_epoch has a circular double linked list of requests
193 static int tl_init(struct drbd_conf *mdev)
195 struct drbd_tl_epoch *b;
197 /* during device minor initialization, we may well use GFP_KERNEL */
198 b = kmalloc(sizeof(struct drbd_tl_epoch), GFP_KERNEL);
201 INIT_LIST_HEAD(&b->requests);
202 INIT_LIST_HEAD(&b->w.list);
206 b->w.cb = NULL; /* if this is != NULL, we need to dec_ap_pending in tl_clear */
208 mdev->oldest_tle = b;
209 mdev->newest_tle = b;
210 INIT_LIST_HEAD(&mdev->out_of_sequence_requests);
212 mdev->tl_hash = NULL;
218 static void tl_cleanup(struct drbd_conf *mdev)
220 D_ASSERT(mdev->oldest_tle == mdev->newest_tle);
221 D_ASSERT(list_empty(&mdev->out_of_sequence_requests));
222 kfree(mdev->oldest_tle);
223 mdev->oldest_tle = NULL;
224 kfree(mdev->unused_spare_tle);
225 mdev->unused_spare_tle = NULL;
226 kfree(mdev->tl_hash);
227 mdev->tl_hash = NULL;
232 * _tl_add_barrier() - Adds a barrier to the transfer log
233 * @mdev: DRBD device.
234 * @new: Barrier to be added before the current head of the TL.
236 * The caller must hold the req_lock.
238 void _tl_add_barrier(struct drbd_conf *mdev, struct drbd_tl_epoch *new)
240 struct drbd_tl_epoch *newest_before;
242 INIT_LIST_HEAD(&new->requests);
243 INIT_LIST_HEAD(&new->w.list);
244 new->w.cb = NULL; /* if this is != NULL, we need to dec_ap_pending in tl_clear */
248 newest_before = mdev->newest_tle;
249 /* never send a barrier number == 0, because that is special-cased
250 * when using TCQ for our write ordering code */
251 new->br_number = (newest_before->br_number+1) ?: 1;
252 if (mdev->newest_tle != new) {
253 mdev->newest_tle->next = new;
254 mdev->newest_tle = new;
259 * tl_release() - Free or recycle the oldest &struct drbd_tl_epoch object of the TL
260 * @mdev: DRBD device.
261 * @barrier_nr: Expected identifier of the DRBD write barrier packet.
262 * @set_size: Expected number of requests before that barrier.
264 * In case the passed barrier_nr or set_size does not match the oldest
265 * &struct drbd_tl_epoch objects this function will cause a termination
268 void tl_release(struct drbd_conf *mdev, unsigned int barrier_nr,
269 unsigned int set_size)
271 struct drbd_tl_epoch *b, *nob; /* next old barrier */
272 struct list_head *le, *tle;
273 struct drbd_request *r;
275 spin_lock_irq(&mdev->req_lock);
277 b = mdev->oldest_tle;
279 /* first some paranoia code */
281 dev_err(DEV, "BAD! BarrierAck #%u received, but no epoch in tl!?\n",
285 if (b->br_number != barrier_nr) {
286 dev_err(DEV, "BAD! BarrierAck #%u received, expected #%u!\n",
287 barrier_nr, b->br_number);
290 if (b->n_writes != set_size) {
291 dev_err(DEV, "BAD! BarrierAck #%u received with n_writes=%u, expected n_writes=%u!\n",
292 barrier_nr, set_size, b->n_writes);
296 /* Clean up list of requests processed during current epoch */
297 list_for_each_safe(le, tle, &b->requests) {
298 r = list_entry(le, struct drbd_request, tl_requests);
299 _req_mod(r, barrier_acked);
301 /* There could be requests on the list waiting for completion
302 of the write to the local disk. To avoid corruptions of
303 slab's data structures we have to remove the lists head.
305 Also there could have been a barrier ack out of sequence, overtaking
306 the write acks - which would be a bug and violating write ordering.
307 To not deadlock in case we lose connection while such requests are
308 still pending, we need some way to find them for the
309 _req_mode(connection_lost_while_pending).
311 These have been list_move'd to the out_of_sequence_requests list in
312 _req_mod(, barrier_acked) above.
314 list_del_init(&b->requests);
317 if (test_and_clear_bit(CREATE_BARRIER, &mdev->flags)) {
318 _tl_add_barrier(mdev, b);
320 mdev->oldest_tle = nob;
321 /* if nob == NULL b was the only barrier, and becomes the new
322 barrier. Therefore mdev->oldest_tle points already to b */
324 D_ASSERT(nob != NULL);
325 mdev->oldest_tle = nob;
329 spin_unlock_irq(&mdev->req_lock);
330 dec_ap_pending(mdev);
335 spin_unlock_irq(&mdev->req_lock);
336 drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR));
340 /* In C_AHEAD mode only out_of_sync packets are sent for requests. Detach
341 * those requests from the newsest barrier when changing to an other cstate.
343 * That headless list vanishes when the last request finished its write or
344 * send out_of_sync packet. */
345 static void tl_forget(struct drbd_conf *mdev)
347 struct drbd_tl_epoch *b;
349 if (test_bit(CREATE_BARRIER, &mdev->flags))
352 b = mdev->newest_tle;
353 list_del(&b->requests);
354 _tl_add_barrier(mdev, b);
358 * _tl_restart() - Walks the transfer log, and applies an action to all requests
359 * @mdev: DRBD device.
360 * @what: The action/event to perform with all request objects
362 * @what might be one of connection_lost_while_pending, resend, fail_frozen_disk_io,
363 * restart_frozen_disk_io.
365 static void _tl_restart(struct drbd_conf *mdev, enum drbd_req_event what)
367 struct drbd_tl_epoch *b, *tmp, **pn;
368 struct list_head *le, *tle, carry_reads;
369 struct drbd_request *req;
370 int rv, n_writes, n_reads;
372 b = mdev->oldest_tle;
373 pn = &mdev->oldest_tle;
377 INIT_LIST_HEAD(&carry_reads);
378 list_for_each_safe(le, tle, &b->requests) {
379 req = list_entry(le, struct drbd_request, tl_requests);
380 rv = _req_mod(req, what);
382 n_writes += (rv & MR_WRITE) >> MR_WRITE_SHIFT;
383 n_reads += (rv & MR_READ) >> MR_READ_SHIFT;
388 if (what == resend) {
389 b->n_writes = n_writes;
390 if (b->w.cb == NULL) {
391 b->w.cb = w_send_barrier;
392 inc_ap_pending(mdev);
393 set_bit(CREATE_BARRIER, &mdev->flags);
396 drbd_queue_work(&mdev->data.work, &b->w);
401 list_add(&carry_reads, &b->requests);
402 /* there could still be requests on that ring list,
403 * in case local io is still pending */
404 list_del(&b->requests);
406 /* dec_ap_pending corresponding to queue_barrier.
407 * the newest barrier may not have been queued yet,
408 * in which case w.cb is still NULL. */
410 dec_ap_pending(mdev);
412 if (b == mdev->newest_tle) {
413 /* recycle, but reinit! */
414 D_ASSERT(tmp == NULL);
415 INIT_LIST_HEAD(&b->requests);
416 list_splice(&carry_reads, &b->requests);
417 INIT_LIST_HEAD(&b->w.list);
419 b->br_number = net_random();
429 list_splice(&carry_reads, &b->requests);
435 * tl_clear() - Clears all requests and &struct drbd_tl_epoch objects out of the TL
436 * @mdev: DRBD device.
438 * This is called after the connection to the peer was lost. The storage covered
439 * by the requests on the transfer gets marked as our of sync. Called from the
440 * receiver thread and the worker thread.
442 void tl_clear(struct drbd_conf *mdev)
444 struct list_head *le, *tle;
445 struct drbd_request *r;
447 spin_lock_irq(&mdev->req_lock);
449 _tl_restart(mdev, connection_lost_while_pending);
451 /* we expect this list to be empty. */
452 D_ASSERT(list_empty(&mdev->out_of_sequence_requests));
454 /* but just in case, clean it up anyways! */
455 list_for_each_safe(le, tle, &mdev->out_of_sequence_requests) {
456 r = list_entry(le, struct drbd_request, tl_requests);
457 /* It would be nice to complete outside of spinlock.
458 * But this is easier for now. */
459 _req_mod(r, connection_lost_while_pending);
462 /* ensure bit indicating barrier is required is clear */
463 clear_bit(CREATE_BARRIER, &mdev->flags);
465 memset(mdev->app_reads_hash, 0, APP_R_HSIZE*sizeof(void *));
467 spin_unlock_irq(&mdev->req_lock);
470 void tl_restart(struct drbd_conf *mdev, enum drbd_req_event what)
472 spin_lock_irq(&mdev->req_lock);
473 _tl_restart(mdev, what);
474 spin_unlock_irq(&mdev->req_lock);
478 * cl_wide_st_chg() - true if the state change is a cluster wide one
479 * @mdev: DRBD device.
480 * @os: old (current) state.
481 * @ns: new (wanted) state.
483 static int cl_wide_st_chg(struct drbd_conf *mdev,
484 union drbd_state os, union drbd_state ns)
486 return (os.conn >= C_CONNECTED && ns.conn >= C_CONNECTED &&
487 ((os.role != R_PRIMARY && ns.role == R_PRIMARY) ||
488 (os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) ||
489 (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S) ||
490 (os.disk != D_DISKLESS && ns.disk == D_DISKLESS))) ||
491 (os.conn >= C_CONNECTED && ns.conn == C_DISCONNECTING) ||
492 (os.conn == C_CONNECTED && ns.conn == C_VERIFY_S);
496 drbd_change_state(struct drbd_conf *mdev, enum chg_state_flags f,
497 union drbd_state mask, union drbd_state val)
500 union drbd_state os, ns;
501 enum drbd_state_rv rv;
503 spin_lock_irqsave(&mdev->req_lock, flags);
505 ns.i = (os.i & ~mask.i) | val.i;
506 rv = _drbd_set_state(mdev, ns, f, NULL);
508 spin_unlock_irqrestore(&mdev->req_lock, flags);
514 * drbd_force_state() - Impose a change which happens outside our control on our state
515 * @mdev: DRBD device.
516 * @mask: mask of state bits to change.
517 * @val: value of new state bits.
519 void drbd_force_state(struct drbd_conf *mdev,
520 union drbd_state mask, union drbd_state val)
522 drbd_change_state(mdev, CS_HARD, mask, val);
525 static enum drbd_state_rv is_valid_state(struct drbd_conf *, union drbd_state);
526 static enum drbd_state_rv is_valid_state_transition(struct drbd_conf *,
529 static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state os,
530 union drbd_state ns, const char **warn_sync_abort);
531 int drbd_send_state_req(struct drbd_conf *,
532 union drbd_state, union drbd_state);
534 static enum drbd_state_rv
535 _req_st_cond(struct drbd_conf *mdev, union drbd_state mask,
536 union drbd_state val)
538 union drbd_state os, ns;
540 enum drbd_state_rv rv;
542 if (test_and_clear_bit(CL_ST_CHG_SUCCESS, &mdev->flags))
543 return SS_CW_SUCCESS;
545 if (test_and_clear_bit(CL_ST_CHG_FAIL, &mdev->flags))
546 return SS_CW_FAILED_BY_PEER;
549 spin_lock_irqsave(&mdev->req_lock, flags);
551 ns.i = (os.i & ~mask.i) | val.i;
552 ns = sanitize_state(mdev, os, ns, NULL);
554 if (!cl_wide_st_chg(mdev, os, ns))
557 rv = is_valid_state(mdev, ns);
558 if (rv == SS_SUCCESS) {
559 rv = is_valid_state_transition(mdev, ns, os);
560 if (rv == SS_SUCCESS)
561 rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */
564 spin_unlock_irqrestore(&mdev->req_lock, flags);
570 * drbd_req_state() - Perform an eventually cluster wide state change
571 * @mdev: DRBD device.
572 * @mask: mask of state bits to change.
573 * @val: value of new state bits.
576 * Should not be called directly, use drbd_request_state() or
577 * _drbd_request_state().
579 static enum drbd_state_rv
580 drbd_req_state(struct drbd_conf *mdev, union drbd_state mask,
581 union drbd_state val, enum chg_state_flags f)
583 struct completion done;
585 union drbd_state os, ns;
586 enum drbd_state_rv rv;
588 init_completion(&done);
590 if (f & CS_SERIALIZE)
591 mutex_lock(&mdev->state_mutex);
593 spin_lock_irqsave(&mdev->req_lock, flags);
595 ns.i = (os.i & ~mask.i) | val.i;
596 ns = sanitize_state(mdev, os, ns, NULL);
598 if (cl_wide_st_chg(mdev, os, ns)) {
599 rv = is_valid_state(mdev, ns);
600 if (rv == SS_SUCCESS)
601 rv = is_valid_state_transition(mdev, ns, os);
602 spin_unlock_irqrestore(&mdev->req_lock, flags);
604 if (rv < SS_SUCCESS) {
606 print_st_err(mdev, os, ns, rv);
610 drbd_state_lock(mdev);
611 if (!drbd_send_state_req(mdev, mask, val)) {
612 drbd_state_unlock(mdev);
613 rv = SS_CW_FAILED_BY_PEER;
615 print_st_err(mdev, os, ns, rv);
619 wait_event(mdev->state_wait,
620 (rv = _req_st_cond(mdev, mask, val)));
622 if (rv < SS_SUCCESS) {
623 drbd_state_unlock(mdev);
625 print_st_err(mdev, os, ns, rv);
628 spin_lock_irqsave(&mdev->req_lock, flags);
630 ns.i = (os.i & ~mask.i) | val.i;
631 rv = _drbd_set_state(mdev, ns, f, &done);
632 drbd_state_unlock(mdev);
634 rv = _drbd_set_state(mdev, ns, f, &done);
637 spin_unlock_irqrestore(&mdev->req_lock, flags);
639 if (f & CS_WAIT_COMPLETE && rv == SS_SUCCESS) {
640 D_ASSERT(current != mdev->worker.task);
641 wait_for_completion(&done);
645 if (f & CS_SERIALIZE)
646 mutex_unlock(&mdev->state_mutex);
652 * _drbd_request_state() - Request a state change (with flags)
653 * @mdev: DRBD device.
654 * @mask: mask of state bits to change.
655 * @val: value of new state bits.
658 * Cousin of drbd_request_state(), useful with the CS_WAIT_COMPLETE
659 * flag, or when logging of failed state change requests is not desired.
662 _drbd_request_state(struct drbd_conf *mdev, union drbd_state mask,
663 union drbd_state val, enum chg_state_flags f)
665 enum drbd_state_rv rv;
667 wait_event(mdev->state_wait,
668 (rv = drbd_req_state(mdev, mask, val, f)) != SS_IN_TRANSIENT_STATE);
673 static void print_st(struct drbd_conf *mdev, char *name, union drbd_state ns)
675 dev_err(DEV, " %s = { cs:%s ro:%s/%s ds:%s/%s %c%c%c%c }\n",
677 drbd_conn_str(ns.conn),
678 drbd_role_str(ns.role),
679 drbd_role_str(ns.peer),
680 drbd_disk_str(ns.disk),
681 drbd_disk_str(ns.pdsk),
682 is_susp(ns) ? 's' : 'r',
683 ns.aftr_isp ? 'a' : '-',
684 ns.peer_isp ? 'p' : '-',
685 ns.user_isp ? 'u' : '-'
689 void print_st_err(struct drbd_conf *mdev, union drbd_state os,
690 union drbd_state ns, enum drbd_state_rv err)
692 if (err == SS_IN_TRANSIENT_STATE)
694 dev_err(DEV, "State change failed: %s\n", drbd_set_st_err_str(err));
695 print_st(mdev, " state", os);
696 print_st(mdev, "wanted", ns);
701 * is_valid_state() - Returns an SS_ error code if ns is not valid
702 * @mdev: DRBD device.
703 * @ns: State to consider.
705 static enum drbd_state_rv
706 is_valid_state(struct drbd_conf *mdev, union drbd_state ns)
708 /* See drbd_state_sw_errors in drbd_strings.c */
710 enum drbd_fencing_p fp;
711 enum drbd_state_rv rv = SS_SUCCESS;
714 if (get_ldev(mdev)) {
715 fp = mdev->ldev->dc.fencing;
719 if (get_net_conf(mdev)) {
720 if (!mdev->net_conf->two_primaries &&
721 ns.role == R_PRIMARY && ns.peer == R_PRIMARY)
722 rv = SS_TWO_PRIMARIES;
727 /* already found a reason to abort */;
728 else if (ns.role == R_SECONDARY && mdev->open_cnt)
729 rv = SS_DEVICE_IN_USE;
731 else if (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.disk < D_UP_TO_DATE)
732 rv = SS_NO_UP_TO_DATE_DISK;
734 else if (fp >= FP_RESOURCE &&
735 ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk >= D_UNKNOWN)
738 else if (ns.role == R_PRIMARY && ns.disk <= D_INCONSISTENT && ns.pdsk <= D_INCONSISTENT)
739 rv = SS_NO_UP_TO_DATE_DISK;
741 else if (ns.conn > C_CONNECTED && ns.disk < D_INCONSISTENT)
742 rv = SS_NO_LOCAL_DISK;
744 else if (ns.conn > C_CONNECTED && ns.pdsk < D_INCONSISTENT)
745 rv = SS_NO_REMOTE_DISK;
747 else if (ns.conn > C_CONNECTED && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE)
748 rv = SS_NO_UP_TO_DATE_DISK;
750 else if ((ns.conn == C_CONNECTED ||
751 ns.conn == C_WF_BITMAP_S ||
752 ns.conn == C_SYNC_SOURCE ||
753 ns.conn == C_PAUSED_SYNC_S) &&
754 ns.disk == D_OUTDATED)
755 rv = SS_CONNECTED_OUTDATES;
757 else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
758 (mdev->sync_conf.verify_alg[0] == 0))
759 rv = SS_NO_VERIFY_ALG;
761 else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
762 mdev->agreed_pro_version < 88)
763 rv = SS_NOT_SUPPORTED;
769 * is_valid_state_transition() - Returns an SS_ error code if the state transition is not possible
770 * @mdev: DRBD device.
774 static enum drbd_state_rv
775 is_valid_state_transition(struct drbd_conf *mdev, union drbd_state ns,
778 enum drbd_state_rv rv = SS_SUCCESS;
780 if ((ns.conn == C_STARTING_SYNC_T || ns.conn == C_STARTING_SYNC_S) &&
781 os.conn > C_CONNECTED)
782 rv = SS_RESYNC_RUNNING;
784 if (ns.conn == C_DISCONNECTING && os.conn == C_STANDALONE)
785 rv = SS_ALREADY_STANDALONE;
787 if (ns.disk > D_ATTACHING && os.disk == D_DISKLESS)
790 if (ns.conn == C_WF_CONNECTION && os.conn < C_UNCONNECTED)
791 rv = SS_NO_NET_CONFIG;
793 if (ns.disk == D_OUTDATED && os.disk < D_OUTDATED && os.disk != D_ATTACHING)
794 rv = SS_LOWER_THAN_OUTDATED;
796 if (ns.conn == C_DISCONNECTING && os.conn == C_UNCONNECTED)
797 rv = SS_IN_TRANSIENT_STATE;
799 if (ns.conn == os.conn && ns.conn == C_WF_REPORT_PARAMS)
800 rv = SS_IN_TRANSIENT_STATE;
802 if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && os.conn < C_CONNECTED)
803 rv = SS_NEED_CONNECTION;
805 if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
806 ns.conn != os.conn && os.conn > C_CONNECTED)
807 rv = SS_RESYNC_RUNNING;
809 if ((ns.conn == C_STARTING_SYNC_S || ns.conn == C_STARTING_SYNC_T) &&
810 os.conn < C_CONNECTED)
811 rv = SS_NEED_CONNECTION;
813 if ((ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)
814 && os.conn < C_WF_REPORT_PARAMS)
815 rv = SS_NEED_CONNECTION; /* No NetworkFailure -> SyncTarget etc... */
821 * sanitize_state() - Resolves implicitly necessary additional changes to a state transition
822 * @mdev: DRBD device.
827 * When we loose connection, we have to set the state of the peers disk (pdsk)
828 * to D_UNKNOWN. This rule and many more along those lines are in this function.
830 static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state os,
831 union drbd_state ns, const char **warn_sync_abort)
833 enum drbd_fencing_p fp;
834 enum drbd_disk_state disk_min, disk_max, pdsk_min, pdsk_max;
837 if (get_ldev(mdev)) {
838 fp = mdev->ldev->dc.fencing;
842 /* Disallow Network errors to configure a device's network part */
843 if ((ns.conn >= C_TIMEOUT && ns.conn <= C_TEAR_DOWN) &&
844 os.conn <= C_DISCONNECTING)
847 /* After a network error (+C_TEAR_DOWN) only C_UNCONNECTED or C_DISCONNECTING can follow.
848 * If you try to go into some Sync* state, that shall fail (elsewhere). */
849 if (os.conn >= C_TIMEOUT && os.conn <= C_TEAR_DOWN &&
850 ns.conn != C_UNCONNECTED && ns.conn != C_DISCONNECTING && ns.conn <= C_TEAR_DOWN)
853 /* we cannot fail (again) if we already detached */
854 if (ns.disk == D_FAILED && os.disk == D_DISKLESS)
855 ns.disk = D_DISKLESS;
857 /* if we are only D_ATTACHING yet,
858 * we can (and should) go directly to D_DISKLESS. */
859 if (ns.disk == D_FAILED && os.disk == D_ATTACHING)
860 ns.disk = D_DISKLESS;
862 /* After C_DISCONNECTING only C_STANDALONE may follow */
863 if (os.conn == C_DISCONNECTING && ns.conn != C_STANDALONE)
866 if (ns.conn < C_CONNECTED) {
869 if (ns.pdsk > D_UNKNOWN || ns.pdsk < D_INCONSISTENT)
873 /* Clear the aftr_isp when becoming unconfigured */
874 if (ns.conn == C_STANDALONE && ns.disk == D_DISKLESS && ns.role == R_SECONDARY)
877 /* Abort resync if a disk fails/detaches */
878 if (os.conn > C_CONNECTED && ns.conn > C_CONNECTED &&
879 (ns.disk <= D_FAILED || ns.pdsk <= D_FAILED)) {
882 os.conn == C_VERIFY_S || os.conn == C_VERIFY_T ?
883 "Online-verify" : "Resync";
884 ns.conn = C_CONNECTED;
887 /* Connection breaks down before we finished "Negotiating" */
888 if (ns.conn < C_CONNECTED && ns.disk == D_NEGOTIATING &&
889 get_ldev_if_state(mdev, D_NEGOTIATING)) {
890 if (mdev->ed_uuid == mdev->ldev->md.uuid[UI_CURRENT]) {
891 ns.disk = mdev->new_state_tmp.disk;
892 ns.pdsk = mdev->new_state_tmp.pdsk;
894 dev_alert(DEV, "Connection lost while negotiating, no data!\n");
895 ns.disk = D_DISKLESS;
901 /* D_CONSISTENT and D_OUTDATED vanish when we get connected */
902 if (ns.conn >= C_CONNECTED && ns.conn < C_AHEAD) {
903 if (ns.disk == D_CONSISTENT || ns.disk == D_OUTDATED)
904 ns.disk = D_UP_TO_DATE;
905 if (ns.pdsk == D_CONSISTENT || ns.pdsk == D_OUTDATED)
906 ns.pdsk = D_UP_TO_DATE;
909 /* Implications of the connection stat on the disk states */
910 disk_min = D_DISKLESS;
911 disk_max = D_UP_TO_DATE;
912 pdsk_min = D_INCONSISTENT;
913 pdsk_max = D_UNKNOWN;
914 switch ((enum drbd_conns)ns.conn) {
916 case C_PAUSED_SYNC_T:
917 case C_STARTING_SYNC_T:
920 disk_min = D_INCONSISTENT;
921 disk_max = D_OUTDATED;
922 pdsk_min = D_UP_TO_DATE;
923 pdsk_max = D_UP_TO_DATE;
927 disk_min = D_UP_TO_DATE;
928 disk_max = D_UP_TO_DATE;
929 pdsk_min = D_UP_TO_DATE;
930 pdsk_max = D_UP_TO_DATE;
933 disk_min = D_DISKLESS;
934 disk_max = D_UP_TO_DATE;
935 pdsk_min = D_DISKLESS;
936 pdsk_max = D_UP_TO_DATE;
939 case C_PAUSED_SYNC_S:
940 case C_STARTING_SYNC_S:
942 disk_min = D_UP_TO_DATE;
943 disk_max = D_UP_TO_DATE;
944 pdsk_min = D_INCONSISTENT;
945 pdsk_max = D_CONSISTENT; /* D_OUTDATED would be nice. But explicit outdate necessary*/
948 disk_min = D_INCONSISTENT;
949 disk_max = D_INCONSISTENT;
950 pdsk_min = D_UP_TO_DATE;
951 pdsk_max = D_UP_TO_DATE;
954 disk_min = D_UP_TO_DATE;
955 disk_max = D_UP_TO_DATE;
956 pdsk_min = D_INCONSISTENT;
957 pdsk_max = D_INCONSISTENT;
960 case C_DISCONNECTING:
964 case C_NETWORK_FAILURE:
965 case C_PROTOCOL_ERROR:
967 case C_WF_CONNECTION:
968 case C_WF_REPORT_PARAMS:
972 if (ns.disk > disk_max)
975 if (ns.disk < disk_min) {
976 dev_warn(DEV, "Implicitly set disk from %s to %s\n",
977 drbd_disk_str(ns.disk), drbd_disk_str(disk_min));
980 if (ns.pdsk > pdsk_max)
983 if (ns.pdsk < pdsk_min) {
984 dev_warn(DEV, "Implicitly set pdsk from %s to %s\n",
985 drbd_disk_str(ns.pdsk), drbd_disk_str(pdsk_min));
989 if (fp == FP_STONITH &&
990 (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk > D_OUTDATED) &&
991 !(os.role == R_PRIMARY && os.conn < C_CONNECTED && os.pdsk > D_OUTDATED))
992 ns.susp_fen = 1; /* Suspend IO while fence-peer handler runs (peer lost) */
994 if (mdev->sync_conf.on_no_data == OND_SUSPEND_IO &&
995 (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE) &&
996 !(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE))
997 ns.susp_nod = 1; /* Suspend IO while no data available (no accessible data available) */
999 if (ns.aftr_isp || ns.peer_isp || ns.user_isp) {
1000 if (ns.conn == C_SYNC_SOURCE)
1001 ns.conn = C_PAUSED_SYNC_S;
1002 if (ns.conn == C_SYNC_TARGET)
1003 ns.conn = C_PAUSED_SYNC_T;
1005 if (ns.conn == C_PAUSED_SYNC_S)
1006 ns.conn = C_SYNC_SOURCE;
1007 if (ns.conn == C_PAUSED_SYNC_T)
1008 ns.conn = C_SYNC_TARGET;
1014 /* helper for __drbd_set_state */
1015 static void set_ov_position(struct drbd_conf *mdev, enum drbd_conns cs)
1017 if (mdev->agreed_pro_version < 90)
1018 mdev->ov_start_sector = 0;
1019 mdev->rs_total = drbd_bm_bits(mdev);
1020 mdev->ov_position = 0;
1021 if (cs == C_VERIFY_T) {
1022 /* starting online verify from an arbitrary position
1023 * does not fit well into the existing protocol.
1024 * on C_VERIFY_T, we initialize ov_left and friends
1025 * implicitly in receive_DataRequest once the
1026 * first P_OV_REQUEST is received */
1027 mdev->ov_start_sector = ~(sector_t)0;
1029 unsigned long bit = BM_SECT_TO_BIT(mdev->ov_start_sector);
1030 if (bit >= mdev->rs_total) {
1031 mdev->ov_start_sector =
1032 BM_BIT_TO_SECT(mdev->rs_total - 1);
1035 mdev->rs_total -= bit;
1036 mdev->ov_position = mdev->ov_start_sector;
1038 mdev->ov_left = mdev->rs_total;
1041 static void drbd_resume_al(struct drbd_conf *mdev)
1043 if (test_and_clear_bit(AL_SUSPENDED, &mdev->flags))
1044 dev_info(DEV, "Resumed AL updates\n");
1048 * __drbd_set_state() - Set a new DRBD state
1049 * @mdev: DRBD device.
1052 * @done: Optional completion, that will get completed after the after_state_ch() finished
1054 * Caller needs to hold req_lock, and global_state_lock. Do not call directly.
1057 __drbd_set_state(struct drbd_conf *mdev, union drbd_state ns,
1058 enum chg_state_flags flags, struct completion *done)
1060 union drbd_state os;
1061 enum drbd_state_rv rv = SS_SUCCESS;
1062 const char *warn_sync_abort = NULL;
1063 struct after_state_chg_work *ascw;
1067 ns = sanitize_state(mdev, os, ns, &warn_sync_abort);
1070 return SS_NOTHING_TO_DO;
1072 if (!(flags & CS_HARD)) {
1073 /* pre-state-change checks ; only look at ns */
1074 /* See drbd_state_sw_errors in drbd_strings.c */
1076 rv = is_valid_state(mdev, ns);
1077 if (rv < SS_SUCCESS) {
1078 /* If the old state was illegal as well, then let
1081 if (is_valid_state(mdev, os) == rv)
1082 rv = is_valid_state_transition(mdev, ns, os);
1084 rv = is_valid_state_transition(mdev, ns, os);
1087 if (rv < SS_SUCCESS) {
1088 if (flags & CS_VERBOSE)
1089 print_st_err(mdev, os, ns, rv);
1093 if (warn_sync_abort)
1094 dev_warn(DEV, "%s aborted.\n", warn_sync_abort);
1100 if (ns.role != os.role)
1101 pbp += sprintf(pbp, "role( %s -> %s ) ",
1102 drbd_role_str(os.role),
1103 drbd_role_str(ns.role));
1104 if (ns.peer != os.peer)
1105 pbp += sprintf(pbp, "peer( %s -> %s ) ",
1106 drbd_role_str(os.peer),
1107 drbd_role_str(ns.peer));
1108 if (ns.conn != os.conn)
1109 pbp += sprintf(pbp, "conn( %s -> %s ) ",
1110 drbd_conn_str(os.conn),
1111 drbd_conn_str(ns.conn));
1112 if (ns.disk != os.disk)
1113 pbp += sprintf(pbp, "disk( %s -> %s ) ",
1114 drbd_disk_str(os.disk),
1115 drbd_disk_str(ns.disk));
1116 if (ns.pdsk != os.pdsk)
1117 pbp += sprintf(pbp, "pdsk( %s -> %s ) ",
1118 drbd_disk_str(os.pdsk),
1119 drbd_disk_str(ns.pdsk));
1120 if (is_susp(ns) != is_susp(os))
1121 pbp += sprintf(pbp, "susp( %d -> %d ) ",
1124 if (ns.aftr_isp != os.aftr_isp)
1125 pbp += sprintf(pbp, "aftr_isp( %d -> %d ) ",
1128 if (ns.peer_isp != os.peer_isp)
1129 pbp += sprintf(pbp, "peer_isp( %d -> %d ) ",
1132 if (ns.user_isp != os.user_isp)
1133 pbp += sprintf(pbp, "user_isp( %d -> %d ) ",
1136 dev_info(DEV, "%s\n", pb);
1139 /* solve the race between becoming unconfigured,
1140 * worker doing the cleanup, and
1141 * admin reconfiguring us:
1142 * on (re)configure, first set CONFIG_PENDING,
1143 * then wait for a potentially exiting worker,
1144 * start the worker, and schedule one no_op.
1145 * then proceed with configuration.
1147 if (ns.disk == D_DISKLESS &&
1148 ns.conn == C_STANDALONE &&
1149 ns.role == R_SECONDARY &&
1150 !test_and_set_bit(CONFIG_PENDING, &mdev->flags))
1151 set_bit(DEVICE_DYING, &mdev->flags);
1153 /* if we are going -> D_FAILED or D_DISKLESS, grab one extra reference
1154 * on the ldev here, to be sure the transition -> D_DISKLESS resp.
1155 * drbd_ldev_destroy() won't happen before our corresponding
1156 * after_state_ch works run, where we put_ldev again. */
1157 if ((os.disk != D_FAILED && ns.disk == D_FAILED) ||
1158 (os.disk != D_DISKLESS && ns.disk == D_DISKLESS))
1159 atomic_inc(&mdev->local_cnt);
1162 wake_up(&mdev->misc_wait);
1163 wake_up(&mdev->state_wait);
1165 /* aborted verify run. log the last position */
1166 if ((os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) &&
1167 ns.conn < C_CONNECTED) {
1168 mdev->ov_start_sector =
1169 BM_BIT_TO_SECT(drbd_bm_bits(mdev) - mdev->ov_left);
1170 dev_info(DEV, "Online Verify reached sector %llu\n",
1171 (unsigned long long)mdev->ov_start_sector);
1174 if ((os.conn == C_PAUSED_SYNC_T || os.conn == C_PAUSED_SYNC_S) &&
1175 (ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)) {
1176 dev_info(DEV, "Syncer continues.\n");
1177 mdev->rs_paused += (long)jiffies
1178 -(long)mdev->rs_mark_time[mdev->rs_last_mark];
1179 if (ns.conn == C_SYNC_TARGET)
1180 mod_timer(&mdev->resync_timer, jiffies);
1183 if ((os.conn == C_SYNC_TARGET || os.conn == C_SYNC_SOURCE) &&
1184 (ns.conn == C_PAUSED_SYNC_T || ns.conn == C_PAUSED_SYNC_S)) {
1185 dev_info(DEV, "Resync suspended\n");
1186 mdev->rs_mark_time[mdev->rs_last_mark] = jiffies;
1189 if (os.conn == C_CONNECTED &&
1190 (ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T)) {
1191 unsigned long now = jiffies;
1194 set_ov_position(mdev, ns.conn);
1195 mdev->rs_start = now;
1196 mdev->rs_last_events = 0;
1197 mdev->rs_last_sect_ev = 0;
1198 mdev->ov_last_oos_size = 0;
1199 mdev->ov_last_oos_start = 0;
1201 for (i = 0; i < DRBD_SYNC_MARKS; i++) {
1202 mdev->rs_mark_left[i] = mdev->ov_left;
1203 mdev->rs_mark_time[i] = now;
1206 drbd_rs_controller_reset(mdev);
1208 if (ns.conn == C_VERIFY_S) {
1209 dev_info(DEV, "Starting Online Verify from sector %llu\n",
1210 (unsigned long long)mdev->ov_position);
1211 mod_timer(&mdev->resync_timer, jiffies);
1215 if (get_ldev(mdev)) {
1216 u32 mdf = mdev->ldev->md.flags & ~(MDF_CONSISTENT|MDF_PRIMARY_IND|
1217 MDF_CONNECTED_IND|MDF_WAS_UP_TO_DATE|
1218 MDF_PEER_OUT_DATED|MDF_CRASHED_PRIMARY);
1220 if (test_bit(CRASHED_PRIMARY, &mdev->flags))
1221 mdf |= MDF_CRASHED_PRIMARY;
1222 if (mdev->state.role == R_PRIMARY ||
1223 (mdev->state.pdsk < D_INCONSISTENT && mdev->state.peer == R_PRIMARY))
1224 mdf |= MDF_PRIMARY_IND;
1225 if (mdev->state.conn > C_WF_REPORT_PARAMS)
1226 mdf |= MDF_CONNECTED_IND;
1227 if (mdev->state.disk > D_INCONSISTENT)
1228 mdf |= MDF_CONSISTENT;
1229 if (mdev->state.disk > D_OUTDATED)
1230 mdf |= MDF_WAS_UP_TO_DATE;
1231 if (mdev->state.pdsk <= D_OUTDATED && mdev->state.pdsk >= D_INCONSISTENT)
1232 mdf |= MDF_PEER_OUT_DATED;
1233 if (mdf != mdev->ldev->md.flags) {
1234 mdev->ldev->md.flags = mdf;
1235 drbd_md_mark_dirty(mdev);
1237 if (os.disk < D_CONSISTENT && ns.disk >= D_CONSISTENT)
1238 drbd_set_ed_uuid(mdev, mdev->ldev->md.uuid[UI_CURRENT]);
1242 /* Peer was forced D_UP_TO_DATE & R_PRIMARY, consider to resync */
1243 if (os.disk == D_INCONSISTENT && os.pdsk == D_INCONSISTENT &&
1244 os.peer == R_SECONDARY && ns.peer == R_PRIMARY)
1245 set_bit(CONSIDER_RESYNC, &mdev->flags);
1247 /* Receiver should clean up itself */
1248 if (os.conn != C_DISCONNECTING && ns.conn == C_DISCONNECTING)
1249 drbd_thread_stop_nowait(&mdev->receiver);
1251 /* Now the receiver finished cleaning up itself, it should die */
1252 if (os.conn != C_STANDALONE && ns.conn == C_STANDALONE)
1253 drbd_thread_stop_nowait(&mdev->receiver);
1255 /* Upon network failure, we need to restart the receiver. */
1256 if (os.conn > C_TEAR_DOWN &&
1257 ns.conn <= C_TEAR_DOWN && ns.conn >= C_TIMEOUT)
1258 drbd_thread_restart_nowait(&mdev->receiver);
1260 /* Resume AL writing if we get a connection */
1261 if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED)
1262 drbd_resume_al(mdev);
1264 /* Start a new epoch in case we start to mirror write requests */
1265 if (!drbd_should_do_remote(os) && drbd_should_do_remote(ns))
1268 /* Do not add local-only requests to an epoch with mirrored requests */
1269 if (drbd_should_do_remote(os) && !drbd_should_do_remote(ns))
1270 set_bit(CREATE_BARRIER, &mdev->flags);
1272 ascw = kmalloc(sizeof(*ascw), GFP_ATOMIC);
1276 ascw->flags = flags;
1277 ascw->w.cb = w_after_state_ch;
1279 drbd_queue_work(&mdev->data.work, &ascw->w);
1281 dev_warn(DEV, "Could not kmalloc an ascw\n");
1287 static int w_after_state_ch(struct drbd_conf *mdev, struct drbd_work *w, int unused)
1289 struct after_state_chg_work *ascw =
1290 container_of(w, struct after_state_chg_work, w);
1291 after_state_ch(mdev, ascw->os, ascw->ns, ascw->flags);
1292 if (ascw->flags & CS_WAIT_COMPLETE) {
1293 D_ASSERT(ascw->done != NULL);
1294 complete(ascw->done);
1301 static void abw_start_sync(struct drbd_conf *mdev, int rv)
1304 dev_err(DEV, "Writing the bitmap failed not starting resync.\n");
1305 _drbd_request_state(mdev, NS(conn, C_CONNECTED), CS_VERBOSE);
1309 switch (mdev->state.conn) {
1310 case C_STARTING_SYNC_T:
1311 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE);
1313 case C_STARTING_SYNC_S:
1314 drbd_start_resync(mdev, C_SYNC_SOURCE);
1319 int drbd_bitmap_io_from_worker(struct drbd_conf *mdev, int (*io_fn)(struct drbd_conf *), char *why)
1323 D_ASSERT(current == mdev->worker.task);
1325 /* open coded non-blocking drbd_suspend_io(mdev); */
1326 set_bit(SUSPEND_IO, &mdev->flags);
1327 if (!is_susp(mdev->state))
1328 D_ASSERT(atomic_read(&mdev->ap_bio_cnt) == 0);
1330 drbd_bm_lock(mdev, why);
1332 drbd_bm_unlock(mdev);
1334 drbd_resume_io(mdev);
1340 * after_state_ch() - Perform after state change actions that may sleep
1341 * @mdev: DRBD device.
1346 static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
1347 union drbd_state ns, enum chg_state_flags flags)
1349 enum drbd_fencing_p fp;
1350 enum drbd_req_event what = nothing;
1351 union drbd_state nsm = (union drbd_state){ .i = -1 };
1353 if (os.conn != C_CONNECTED && ns.conn == C_CONNECTED) {
1354 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1356 mdev->p_uuid[UI_FLAGS] &= ~((u64)2);
1360 if (get_ldev(mdev)) {
1361 fp = mdev->ldev->dc.fencing;
1365 /* Inform userspace about the change... */
1366 drbd_bcast_state(mdev, ns);
1368 if (!(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE) &&
1369 (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE))
1370 drbd_khelper(mdev, "pri-on-incon-degr");
1372 /* Here we have the actions that are performed after a
1373 state change. This function might sleep */
1377 if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED)
1380 if (os.disk == D_ATTACHING && ns.disk > D_ATTACHING)
1381 what = restart_frozen_disk_io;
1383 if (what != nothing)
1388 /* case1: The outdate peer handler is successful: */
1389 if (os.pdsk > D_OUTDATED && ns.pdsk <= D_OUTDATED) {
1391 if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
1392 drbd_uuid_new_current(mdev);
1393 clear_bit(NEW_CUR_UUID, &mdev->flags);
1395 spin_lock_irq(&mdev->req_lock);
1396 _drbd_set_state(_NS(mdev, susp_fen, 0), CS_VERBOSE, NULL);
1397 spin_unlock_irq(&mdev->req_lock);
1399 /* case2: The connection was established again: */
1400 if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) {
1401 clear_bit(NEW_CUR_UUID, &mdev->flags);
1407 if (what != nothing) {
1408 spin_lock_irq(&mdev->req_lock);
1409 _tl_restart(mdev, what);
1410 nsm.i &= mdev->state.i;
1411 _drbd_set_state(mdev, nsm, CS_VERBOSE, NULL);
1412 spin_unlock_irq(&mdev->req_lock);
1415 /* Became sync source. With protocol >= 96, we still need to send out
1416 * the sync uuid now. Need to do that before any drbd_send_state, or
1417 * the other side may go "paused sync" before receiving the sync uuids,
1418 * which is unexpected. */
1419 if ((os.conn != C_SYNC_SOURCE && os.conn != C_PAUSED_SYNC_S) &&
1420 (ns.conn == C_SYNC_SOURCE || ns.conn == C_PAUSED_SYNC_S) &&
1421 mdev->agreed_pro_version >= 96 && get_ldev(mdev)) {
1422 drbd_gen_and_send_sync_uuid(mdev);
1426 /* Do not change the order of the if above and the two below... */
1427 if (os.pdsk == D_DISKLESS && ns.pdsk > D_DISKLESS) { /* attach on the peer */
1428 drbd_send_uuids(mdev);
1429 drbd_send_state(mdev);
1431 /* No point in queuing send_bitmap if we don't have a connection
1432 * anymore, so check also the _current_ state, not only the new state
1433 * at the time this work was queued. */
1434 if (os.conn != C_WF_BITMAP_S && ns.conn == C_WF_BITMAP_S &&
1435 mdev->state.conn == C_WF_BITMAP_S)
1436 drbd_queue_bitmap_io(mdev, &drbd_send_bitmap, NULL,
1437 "send_bitmap (WFBitMapS)");
1439 /* Lost contact to peer's copy of the data */
1440 if ((os.pdsk >= D_INCONSISTENT &&
1441 os.pdsk != D_UNKNOWN &&
1442 os.pdsk != D_OUTDATED)
1443 && (ns.pdsk < D_INCONSISTENT ||
1444 ns.pdsk == D_UNKNOWN ||
1445 ns.pdsk == D_OUTDATED)) {
1446 if (get_ldev(mdev)) {
1447 if ((ns.role == R_PRIMARY || ns.peer == R_PRIMARY) &&
1448 mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) {
1449 if (is_susp(mdev->state)) {
1450 set_bit(NEW_CUR_UUID, &mdev->flags);
1452 drbd_uuid_new_current(mdev);
1453 drbd_send_uuids(mdev);
1460 if (ns.pdsk < D_INCONSISTENT && get_ldev(mdev)) {
1461 if (ns.peer == R_PRIMARY && mdev->ldev->md.uuid[UI_BITMAP] == 0) {
1462 drbd_uuid_new_current(mdev);
1463 drbd_send_uuids(mdev);
1466 /* D_DISKLESS Peer becomes secondary */
1467 if (os.peer == R_PRIMARY && ns.peer == R_SECONDARY)
1468 drbd_bitmap_io_from_worker(mdev, &drbd_bm_write, "demote diskless peer");
1472 /* Write out all changed bits on demote.
1473 * Though, no need to da that just yet
1474 * if there is a resync going on still */
1475 if (os.role == R_PRIMARY && ns.role == R_SECONDARY &&
1476 mdev->state.conn <= C_CONNECTED && get_ldev(mdev)) {
1477 drbd_bitmap_io_from_worker(mdev, &drbd_bm_write, "demote");
1481 /* Last part of the attaching process ... */
1482 if (ns.conn >= C_CONNECTED &&
1483 os.disk == D_ATTACHING && ns.disk == D_NEGOTIATING) {
1484 drbd_send_sizes(mdev, 0, 0); /* to start sync... */
1485 drbd_send_uuids(mdev);
1486 drbd_send_state(mdev);
1489 /* We want to pause/continue resync, tell peer. */
1490 if (ns.conn >= C_CONNECTED &&
1491 ((os.aftr_isp != ns.aftr_isp) ||
1492 (os.user_isp != ns.user_isp)))
1493 drbd_send_state(mdev);
1495 /* In case one of the isp bits got set, suspend other devices. */
1496 if ((!os.aftr_isp && !os.peer_isp && !os.user_isp) &&
1497 (ns.aftr_isp || ns.peer_isp || ns.user_isp))
1498 suspend_other_sg(mdev);
1500 /* Make sure the peer gets informed about eventual state
1501 changes (ISP bits) while we were in WFReportParams. */
1502 if (os.conn == C_WF_REPORT_PARAMS && ns.conn >= C_CONNECTED)
1503 drbd_send_state(mdev);
1505 if (os.conn != C_AHEAD && ns.conn == C_AHEAD)
1506 drbd_send_state(mdev);
1508 /* We are in the progress to start a full sync... */
1509 if ((os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) ||
1510 (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S))
1511 drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, &abw_start_sync, "set_n_write from StartingSync");
1513 /* We are invalidating our self... */
1514 if (os.conn < C_CONNECTED && ns.conn < C_CONNECTED &&
1515 os.disk > D_INCONSISTENT && ns.disk == D_INCONSISTENT)
1516 drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, NULL, "set_n_write from invalidate");
1518 /* first half of local IO error, failure to attach,
1519 * or administrative detach */
1520 if (os.disk != D_FAILED && ns.disk == D_FAILED) {
1521 enum drbd_io_error_p eh;
1523 /* corresponding get_ldev was in __drbd_set_state, to serialize
1524 * our cleanup here with the transition to D_DISKLESS,
1525 * so it is safe to dreference ldev here. */
1526 eh = mdev->ldev->dc.on_io_error;
1527 was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags);
1529 /* current state still has to be D_FAILED,
1530 * there is only one way out: to D_DISKLESS,
1531 * and that may only happen after our put_ldev below. */
1532 if (mdev->state.disk != D_FAILED)
1534 "ASSERT FAILED: disk is %s during detach\n",
1535 drbd_disk_str(mdev->state.disk));
1537 if (drbd_send_state(mdev))
1538 dev_warn(DEV, "Notified peer that I am detaching my disk\n");
1540 dev_err(DEV, "Sending state for detaching disk failed\n");
1542 drbd_rs_cancel_all(mdev);
1544 /* In case we want to get something to stable storage still,
1545 * this may be the last chance.
1546 * Following put_ldev may transition to D_DISKLESS. */
1550 if (was_io_error && eh == EP_CALL_HELPER)
1551 drbd_khelper(mdev, "local-io-error");
1554 /* second half of local IO error, failure to attach,
1555 * or administrative detach,
1556 * after local_cnt references have reached zero again */
1557 if (os.disk != D_DISKLESS && ns.disk == D_DISKLESS) {
1558 /* We must still be diskless,
1559 * re-attach has to be serialized with this! */
1560 if (mdev->state.disk != D_DISKLESS)
1562 "ASSERT FAILED: disk is %s while going diskless\n",
1563 drbd_disk_str(mdev->state.disk));
1566 mdev->rs_failed = 0;
1567 atomic_set(&mdev->rs_pending_cnt, 0);
1569 if (drbd_send_state(mdev))
1570 dev_warn(DEV, "Notified peer that I'm now diskless.\n");
1572 dev_err(DEV, "Sending state for being diskless failed\n");
1573 /* corresponding get_ldev in __drbd_set_state
1574 * this may finaly trigger drbd_ldev_destroy. */
1578 /* Disks got bigger while they were detached */
1579 if (ns.disk > D_NEGOTIATING && ns.pdsk > D_NEGOTIATING &&
1580 test_and_clear_bit(RESYNC_AFTER_NEG, &mdev->flags)) {
1581 if (ns.conn == C_CONNECTED)
1582 resync_after_online_grow(mdev);
1585 /* A resync finished or aborted, wake paused devices... */
1586 if ((os.conn > C_CONNECTED && ns.conn <= C_CONNECTED) ||
1587 (os.peer_isp && !ns.peer_isp) ||
1588 (os.user_isp && !ns.user_isp))
1589 resume_next_sg(mdev);
1591 /* sync target done with resync. Explicitly notify peer, even though
1592 * it should (at least for non-empty resyncs) already know itself. */
1593 if (os.disk < D_UP_TO_DATE && os.conn >= C_SYNC_SOURCE && ns.conn == C_CONNECTED)
1594 drbd_send_state(mdev);
1596 if (os.conn > C_CONNECTED && ns.conn <= C_CONNECTED)
1597 drbd_queue_bitmap_io(mdev, &drbd_bm_write, NULL, "write from resync_finished");
1599 /* free tl_hash if we Got thawed and are C_STANDALONE */
1600 if (ns.conn == C_STANDALONE && !is_susp(ns) && mdev->tl_hash)
1601 drbd_free_tl_hash(mdev);
1603 /* Upon network connection, we need to start the receiver */
1604 if (os.conn == C_STANDALONE && ns.conn == C_UNCONNECTED)
1605 drbd_thread_start(&mdev->receiver);
1607 /* Terminate worker thread if we are unconfigured - it will be
1608 restarted as needed... */
1609 if (ns.disk == D_DISKLESS &&
1610 ns.conn == C_STANDALONE &&
1611 ns.role == R_SECONDARY) {
1612 if (os.aftr_isp != ns.aftr_isp)
1613 resume_next_sg(mdev);
1614 /* set in __drbd_set_state, unless CONFIG_PENDING was set */
1615 if (test_bit(DEVICE_DYING, &mdev->flags))
1616 drbd_thread_stop_nowait(&mdev->worker);
1623 static int drbd_thread_setup(void *arg)
1625 struct drbd_thread *thi = (struct drbd_thread *) arg;
1626 struct drbd_conf *mdev = thi->mdev;
1627 unsigned long flags;
1631 retval = thi->function(thi);
1633 spin_lock_irqsave(&thi->t_lock, flags);
1635 /* if the receiver has been "Exiting", the last thing it did
1636 * was set the conn state to "StandAlone",
1637 * if now a re-connect request comes in, conn state goes C_UNCONNECTED,
1638 * and receiver thread will be "started".
1639 * drbd_thread_start needs to set "Restarting" in that case.
1640 * t_state check and assignment needs to be within the same spinlock,
1641 * so either thread_start sees Exiting, and can remap to Restarting,
1642 * or thread_start see None, and can proceed as normal.
1645 if (thi->t_state == Restarting) {
1646 dev_info(DEV, "Restarting %s\n", current->comm);
1647 thi->t_state = Running;
1648 spin_unlock_irqrestore(&thi->t_lock, flags);
1653 thi->t_state = None;
1655 complete(&thi->stop);
1656 spin_unlock_irqrestore(&thi->t_lock, flags);
1658 dev_info(DEV, "Terminating %s\n", current->comm);
1660 /* Release mod reference taken when thread was started */
1661 module_put(THIS_MODULE);
1665 static void drbd_thread_init(struct drbd_conf *mdev, struct drbd_thread *thi,
1666 int (*func) (struct drbd_thread *))
1668 spin_lock_init(&thi->t_lock);
1670 thi->t_state = None;
1671 thi->function = func;
1675 int drbd_thread_start(struct drbd_thread *thi)
1677 struct drbd_conf *mdev = thi->mdev;
1678 struct task_struct *nt;
1679 unsigned long flags;
1682 thi == &mdev->receiver ? "receiver" :
1683 thi == &mdev->asender ? "asender" :
1684 thi == &mdev->worker ? "worker" : "NONSENSE";
1686 /* is used from state engine doing drbd_thread_stop_nowait,
1687 * while holding the req lock irqsave */
1688 spin_lock_irqsave(&thi->t_lock, flags);
1690 switch (thi->t_state) {
1692 dev_info(DEV, "Starting %s thread (from %s [%d])\n",
1693 me, current->comm, current->pid);
1695 /* Get ref on module for thread - this is released when thread exits */
1696 if (!try_module_get(THIS_MODULE)) {
1697 dev_err(DEV, "Failed to get module reference in drbd_thread_start\n");
1698 spin_unlock_irqrestore(&thi->t_lock, flags);
1702 init_completion(&thi->stop);
1703 D_ASSERT(thi->task == NULL);
1704 thi->reset_cpu_mask = 1;
1705 thi->t_state = Running;
1706 spin_unlock_irqrestore(&thi->t_lock, flags);
1707 flush_signals(current); /* otherw. may get -ERESTARTNOINTR */
1709 nt = kthread_create(drbd_thread_setup, (void *) thi,
1710 "drbd%d_%s", mdev_to_minor(mdev), me);
1713 dev_err(DEV, "Couldn't start thread\n");
1715 module_put(THIS_MODULE);
1718 spin_lock_irqsave(&thi->t_lock, flags);
1720 thi->t_state = Running;
1721 spin_unlock_irqrestore(&thi->t_lock, flags);
1722 wake_up_process(nt);
1725 thi->t_state = Restarting;
1726 dev_info(DEV, "Restarting %s thread (from %s [%d])\n",
1727 me, current->comm, current->pid);
1732 spin_unlock_irqrestore(&thi->t_lock, flags);
1740 void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait)
1742 unsigned long flags;
1744 enum drbd_thread_state ns = restart ? Restarting : Exiting;
1746 /* may be called from state engine, holding the req lock irqsave */
1747 spin_lock_irqsave(&thi->t_lock, flags);
1749 if (thi->t_state == None) {
1750 spin_unlock_irqrestore(&thi->t_lock, flags);
1752 drbd_thread_start(thi);
1756 if (thi->t_state != ns) {
1757 if (thi->task == NULL) {
1758 spin_unlock_irqrestore(&thi->t_lock, flags);
1764 init_completion(&thi->stop);
1765 if (thi->task != current)
1766 force_sig(DRBD_SIGKILL, thi->task);
1770 spin_unlock_irqrestore(&thi->t_lock, flags);
1773 wait_for_completion(&thi->stop);
1778 * drbd_calc_cpu_mask() - Generate CPU masks, spread over all CPUs
1779 * @mdev: DRBD device.
1781 * Forces all threads of a device onto the same CPU. This is beneficial for
1782 * DRBD's performance. May be overwritten by user's configuration.
1784 void drbd_calc_cpu_mask(struct drbd_conf *mdev)
1788 /* user override. */
1789 if (cpumask_weight(mdev->cpu_mask))
1792 ord = mdev_to_minor(mdev) % cpumask_weight(cpu_online_mask);
1793 for_each_online_cpu(cpu) {
1795 cpumask_set_cpu(cpu, mdev->cpu_mask);
1799 /* should not be reached */
1800 cpumask_setall(mdev->cpu_mask);
1804 * drbd_thread_current_set_cpu() - modifies the cpu mask of the _current_ thread
1805 * @mdev: DRBD device.
1807 * call in the "main loop" of _all_ threads, no need for any mutex, current won't die
1810 void drbd_thread_current_set_cpu(struct drbd_conf *mdev)
1812 struct task_struct *p = current;
1813 struct drbd_thread *thi =
1814 p == mdev->asender.task ? &mdev->asender :
1815 p == mdev->receiver.task ? &mdev->receiver :
1816 p == mdev->worker.task ? &mdev->worker :
1820 if (!thi->reset_cpu_mask)
1822 thi->reset_cpu_mask = 0;
1823 set_cpus_allowed_ptr(p, mdev->cpu_mask);
1827 /* the appropriate socket mutex must be held already */
1828 int _drbd_send_cmd(struct drbd_conf *mdev, struct socket *sock,
1829 enum drbd_packets cmd, struct p_header80 *h,
1830 size_t size, unsigned msg_flags)
1834 ERR_IF(!h) return false;
1835 ERR_IF(!size) return false;
1837 h->magic = BE_DRBD_MAGIC;
1838 h->command = cpu_to_be16(cmd);
1839 h->length = cpu_to_be16(size-sizeof(struct p_header80));
1841 sent = drbd_send(mdev, sock, h, size, msg_flags);
1843 ok = (sent == size);
1845 dev_err(DEV, "short sent %s size=%d sent=%d\n",
1846 cmdname(cmd), (int)size, sent);
1850 /* don't pass the socket. we may only look at it
1851 * when we hold the appropriate socket mutex.
1853 int drbd_send_cmd(struct drbd_conf *mdev, int use_data_socket,
1854 enum drbd_packets cmd, struct p_header80 *h, size_t size)
1857 struct socket *sock;
1859 if (use_data_socket) {
1860 mutex_lock(&mdev->data.mutex);
1861 sock = mdev->data.socket;
1863 mutex_lock(&mdev->meta.mutex);
1864 sock = mdev->meta.socket;
1867 /* drbd_disconnect() could have called drbd_free_sock()
1868 * while we were waiting in down()... */
1869 if (likely(sock != NULL))
1870 ok = _drbd_send_cmd(mdev, sock, cmd, h, size, 0);
1872 if (use_data_socket)
1873 mutex_unlock(&mdev->data.mutex);
1875 mutex_unlock(&mdev->meta.mutex);
1879 int drbd_send_cmd2(struct drbd_conf *mdev, enum drbd_packets cmd, char *data,
1882 struct p_header80 h;
1885 h.magic = BE_DRBD_MAGIC;
1886 h.command = cpu_to_be16(cmd);
1887 h.length = cpu_to_be16(size);
1889 if (!drbd_get_data_sock(mdev))
1893 drbd_send(mdev, mdev->data.socket, &h, sizeof(h), 0));
1895 drbd_send(mdev, mdev->data.socket, data, size, 0));
1897 drbd_put_data_sock(mdev);
1902 int drbd_send_sync_param(struct drbd_conf *mdev, struct syncer_conf *sc)
1904 struct p_rs_param_95 *p;
1905 struct socket *sock;
1907 const int apv = mdev->agreed_pro_version;
1909 size = apv <= 87 ? sizeof(struct p_rs_param)
1910 : apv == 88 ? sizeof(struct p_rs_param)
1911 + strlen(mdev->sync_conf.verify_alg) + 1
1912 : apv <= 94 ? sizeof(struct p_rs_param_89)
1913 : /* apv >= 95 */ sizeof(struct p_rs_param_95);
1915 /* used from admin command context and receiver/worker context.
1916 * to avoid kmalloc, grab the socket right here,
1917 * then use the pre-allocated sbuf there */
1918 mutex_lock(&mdev->data.mutex);
1919 sock = mdev->data.socket;
1921 if (likely(sock != NULL)) {
1922 enum drbd_packets cmd = apv >= 89 ? P_SYNC_PARAM89 : P_SYNC_PARAM;
1924 p = &mdev->data.sbuf.rs_param_95;
1926 /* initialize verify_alg and csums_alg */
1927 memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX);
1929 p->rate = cpu_to_be32(sc->rate);
1930 p->c_plan_ahead = cpu_to_be32(sc->c_plan_ahead);
1931 p->c_delay_target = cpu_to_be32(sc->c_delay_target);
1932 p->c_fill_target = cpu_to_be32(sc->c_fill_target);
1933 p->c_max_rate = cpu_to_be32(sc->c_max_rate);
1936 strcpy(p->verify_alg, mdev->sync_conf.verify_alg);
1938 strcpy(p->csums_alg, mdev->sync_conf.csums_alg);
1940 rv = _drbd_send_cmd(mdev, sock, cmd, &p->head, size, 0);
1942 rv = 0; /* not ok */
1944 mutex_unlock(&mdev->data.mutex);
1949 int drbd_send_protocol(struct drbd_conf *mdev)
1951 struct p_protocol *p;
1954 size = sizeof(struct p_protocol);
1956 if (mdev->agreed_pro_version >= 87)
1957 size += strlen(mdev->net_conf->integrity_alg) + 1;
1959 /* we must not recurse into our own queue,
1960 * as that is blocked during handshake */
1961 p = kmalloc(size, GFP_NOIO);
1965 p->protocol = cpu_to_be32(mdev->net_conf->wire_protocol);
1966 p->after_sb_0p = cpu_to_be32(mdev->net_conf->after_sb_0p);
1967 p->after_sb_1p = cpu_to_be32(mdev->net_conf->after_sb_1p);
1968 p->after_sb_2p = cpu_to_be32(mdev->net_conf->after_sb_2p);
1969 p->two_primaries = cpu_to_be32(mdev->net_conf->two_primaries);
1972 if (mdev->net_conf->want_lose)
1974 if (mdev->net_conf->dry_run) {
1975 if (mdev->agreed_pro_version >= 92)
1978 dev_err(DEV, "--dry-run is not supported by peer");
1983 p->conn_flags = cpu_to_be32(cf);
1985 if (mdev->agreed_pro_version >= 87)
1986 strcpy(p->integrity_alg, mdev->net_conf->integrity_alg);
1988 rv = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_PROTOCOL,
1989 (struct p_header80 *)p, size);
1994 int _drbd_send_uuids(struct drbd_conf *mdev, u64 uuid_flags)
1999 if (!get_ldev_if_state(mdev, D_NEGOTIATING))
2002 for (i = UI_CURRENT; i < UI_SIZE; i++)
2003 p.uuid[i] = mdev->ldev ? cpu_to_be64(mdev->ldev->md.uuid[i]) : 0;
2005 mdev->comm_bm_set = drbd_bm_total_weight(mdev);
2006 p.uuid[UI_SIZE] = cpu_to_be64(mdev->comm_bm_set);
2007 uuid_flags |= mdev->net_conf->want_lose ? 1 : 0;
2008 uuid_flags |= test_bit(CRASHED_PRIMARY, &mdev->flags) ? 2 : 0;
2009 uuid_flags |= mdev->new_state_tmp.disk == D_INCONSISTENT ? 4 : 0;
2010 p.uuid[UI_FLAGS] = cpu_to_be64(uuid_flags);
2014 return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_UUIDS,
2015 (struct p_header80 *)&p, sizeof(p));
2018 int drbd_send_uuids(struct drbd_conf *mdev)
2020 return _drbd_send_uuids(mdev, 0);
2023 int drbd_send_uuids_skip_initial_sync(struct drbd_conf *mdev)
2025 return _drbd_send_uuids(mdev, 8);
2028 int drbd_gen_and_send_sync_uuid(struct drbd_conf *mdev)
2033 D_ASSERT(mdev->state.disk == D_UP_TO_DATE);
2035 uuid = mdev->ldev->md.uuid[UI_BITMAP] + UUID_NEW_BM_OFFSET;
2036 drbd_uuid_set(mdev, UI_BITMAP, uuid);
2038 p.uuid = cpu_to_be64(uuid);
2040 return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_SYNC_UUID,
2041 (struct p_header80 *)&p, sizeof(p));
2044 int drbd_send_sizes(struct drbd_conf *mdev, int trigger_reply, enum dds_flags flags)
2047 sector_t d_size, u_size;
2051 if (get_ldev_if_state(mdev, D_NEGOTIATING)) {
2052 D_ASSERT(mdev->ldev->backing_bdev);
2053 d_size = drbd_get_max_capacity(mdev->ldev);
2054 u_size = mdev->ldev->dc.disk_size;
2055 q_order_type = drbd_queue_order_type(mdev);
2060 q_order_type = QUEUE_ORDERED_NONE;
2063 p.d_size = cpu_to_be64(d_size);
2064 p.u_size = cpu_to_be64(u_size);
2065 p.c_size = cpu_to_be64(trigger_reply ? 0 : drbd_get_capacity(mdev->this_bdev));
2066 p.max_bio_size = cpu_to_be32(queue_max_hw_sectors(mdev->rq_queue) << 9);
2067 p.queue_order_type = cpu_to_be16(q_order_type);
2068 p.dds_flags = cpu_to_be16(flags);
2070 ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_SIZES,
2071 (struct p_header80 *)&p, sizeof(p));
2076 * drbd_send_state() - Sends the drbd state to the peer
2077 * @mdev: DRBD device.
2079 int drbd_send_state(struct drbd_conf *mdev)
2081 struct socket *sock;
2085 /* Grab state lock so we wont send state if we're in the middle
2086 * of a cluster wide state change on another thread */
2087 drbd_state_lock(mdev);
2089 mutex_lock(&mdev->data.mutex);
2091 p.state = cpu_to_be32(mdev->state.i); /* Within the send mutex */
2092 sock = mdev->data.socket;
2094 if (likely(sock != NULL)) {
2095 ok = _drbd_send_cmd(mdev, sock, P_STATE,
2096 (struct p_header80 *)&p, sizeof(p), 0);
2099 mutex_unlock(&mdev->data.mutex);
2101 drbd_state_unlock(mdev);
2105 int drbd_send_state_req(struct drbd_conf *mdev,
2106 union drbd_state mask, union drbd_state val)
2108 struct p_req_state p;
2110 p.mask = cpu_to_be32(mask.i);
2111 p.val = cpu_to_be32(val.i);
2113 return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_STATE_CHG_REQ,
2114 (struct p_header80 *)&p, sizeof(p));
2117 int drbd_send_sr_reply(struct drbd_conf *mdev, enum drbd_state_rv retcode)
2119 struct p_req_state_reply p;
2121 p.retcode = cpu_to_be32(retcode);
2123 return drbd_send_cmd(mdev, USE_META_SOCKET, P_STATE_CHG_REPLY,
2124 (struct p_header80 *)&p, sizeof(p));
2127 int fill_bitmap_rle_bits(struct drbd_conf *mdev,
2128 struct p_compressed_bm *p,
2129 struct bm_xfer_ctx *c)
2131 struct bitstream bs;
2132 unsigned long plain_bits;
2139 /* may we use this feature? */
2140 if ((mdev->sync_conf.use_rle == 0) ||
2141 (mdev->agreed_pro_version < 90))
2144 if (c->bit_offset >= c->bm_bits)
2145 return 0; /* nothing to do. */
2147 /* use at most thus many bytes */
2148 bitstream_init(&bs, p->code, BM_PACKET_VLI_BYTES_MAX, 0);
2149 memset(p->code, 0, BM_PACKET_VLI_BYTES_MAX);
2150 /* plain bits covered in this code string */
2153 /* p->encoding & 0x80 stores whether the first run length is set.
2154 * bit offset is implicit.
2155 * start with toggle == 2 to be able to tell the first iteration */
2158 /* see how much plain bits we can stuff into one packet
2159 * using RLE and VLI. */
2161 tmp = (toggle == 0) ? _drbd_bm_find_next_zero(mdev, c->bit_offset)
2162 : _drbd_bm_find_next(mdev, c->bit_offset);
2165 rl = tmp - c->bit_offset;
2167 if (toggle == 2) { /* first iteration */
2169 /* the first checked bit was set,
2170 * store start value, */
2171 DCBP_set_start(p, 1);
2172 /* but skip encoding of zero run length */
2176 DCBP_set_start(p, 0);
2179 /* paranoia: catch zero runlength.
2180 * can only happen if bitmap is modified while we scan it. */
2182 dev_err(DEV, "unexpected zero runlength while encoding bitmap "
2183 "t:%u bo:%lu\n", toggle, c->bit_offset);
2187 bits = vli_encode_bits(&bs, rl);
2188 if (bits == -ENOBUFS) /* buffer full */
2191 dev_err(DEV, "error while encoding bitmap: %d\n", bits);
2197 c->bit_offset = tmp;
2198 } while (c->bit_offset < c->bm_bits);
2200 len = bs.cur.b - p->code + !!bs.cur.bit;
2202 if (plain_bits < (len << 3)) {
2203 /* incompressible with this method.
2204 * we need to rewind both word and bit position. */
2205 c->bit_offset -= plain_bits;
2206 bm_xfer_ctx_bit_to_word_offset(c);
2207 c->bit_offset = c->word_offset * BITS_PER_LONG;
2211 /* RLE + VLI was able to compress it just fine.
2212 * update c->word_offset. */
2213 bm_xfer_ctx_bit_to_word_offset(c);
2215 /* store pad_bits */
2216 DCBP_set_pad_bits(p, (8 - bs.cur.bit) & 0x7);
2222 * send_bitmap_rle_or_plain
2224 * Return 0 when done, 1 when another iteration is needed, and a negative error
2225 * code upon failure.
2228 send_bitmap_rle_or_plain(struct drbd_conf *mdev,
2229 struct p_header80 *h, struct bm_xfer_ctx *c)
2231 struct p_compressed_bm *p = (void*)h;
2232 unsigned long num_words;
2236 len = fill_bitmap_rle_bits(mdev, p, c);
2242 DCBP_set_code(p, RLE_VLI_Bits);
2243 ok = _drbd_send_cmd(mdev, mdev->data.socket, P_COMPRESSED_BITMAP, h,
2244 sizeof(*p) + len, 0);
2247 c->bytes[0] += sizeof(*p) + len;
2249 if (c->bit_offset >= c->bm_bits)
2252 /* was not compressible.
2253 * send a buffer full of plain text bits instead. */
2254 num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset);
2255 len = num_words * sizeof(long);
2257 drbd_bm_get_lel(mdev, c->word_offset, num_words, (unsigned long*)h->payload);
2258 ok = _drbd_send_cmd(mdev, mdev->data.socket, P_BITMAP,
2259 h, sizeof(struct p_header80) + len, 0);
2260 c->word_offset += num_words;
2261 c->bit_offset = c->word_offset * BITS_PER_LONG;
2264 c->bytes[1] += sizeof(struct p_header80) + len;
2266 if (c->bit_offset > c->bm_bits)
2267 c->bit_offset = c->bm_bits;
2271 INFO_bm_xfer_stats(mdev, "send", c);
2279 /* See the comment at receive_bitmap() */
2280 int _drbd_send_bitmap(struct drbd_conf *mdev)
2282 struct bm_xfer_ctx c;
2283 struct p_header80 *p;
2286 ERR_IF(!mdev->bitmap) return false;
2288 /* maybe we should use some per thread scratch page,
2289 * and allocate that during initial device creation? */
2290 p = (struct p_header80 *) __get_free_page(GFP_NOIO);
2292 dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__);
2296 if (get_ldev(mdev)) {
2297 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
2298 dev_info(DEV, "Writing the whole bitmap, MDF_FullSync was set.\n");
2299 drbd_bm_set_all(mdev);
2300 if (drbd_bm_write(mdev)) {
2301 /* write_bm did fail! Leave full sync flag set in Meta P_DATA
2302 * but otherwise process as per normal - need to tell other
2303 * side that a full resync is required! */
2304 dev_err(DEV, "Failed to write bitmap to disk!\n");
2306 drbd_md_clear_flag(mdev, MDF_FULL_SYNC);
2313 c = (struct bm_xfer_ctx) {
2314 .bm_bits = drbd_bm_bits(mdev),
2315 .bm_words = drbd_bm_words(mdev),
2319 err = send_bitmap_rle_or_plain(mdev, p, &c);
2322 free_page((unsigned long) p);
2326 int drbd_send_bitmap(struct drbd_conf *mdev)
2330 if (!drbd_get_data_sock(mdev))
2332 err = !_drbd_send_bitmap(mdev);
2333 drbd_put_data_sock(mdev);
2337 int drbd_send_b_ack(struct drbd_conf *mdev, u32 barrier_nr, u32 set_size)
2340 struct p_barrier_ack p;
2342 p.barrier = barrier_nr;
2343 p.set_size = cpu_to_be32(set_size);
2345 if (mdev->state.conn < C_CONNECTED)
2347 ok = drbd_send_cmd(mdev, USE_META_SOCKET, P_BARRIER_ACK,
2348 (struct p_header80 *)&p, sizeof(p));
2353 * _drbd_send_ack() - Sends an ack packet
2354 * @mdev: DRBD device.
2355 * @cmd: Packet command code.
2356 * @sector: sector, needs to be in big endian byte order
2357 * @blksize: size in byte, needs to be in big endian byte order
2358 * @block_id: Id, big endian byte order
2360 static int _drbd_send_ack(struct drbd_conf *mdev, enum drbd_packets cmd,
2366 struct p_block_ack p;
2369 p.block_id = block_id;
2370 p.blksize = blksize;
2371 p.seq_num = cpu_to_be32(atomic_add_return(1, &mdev->packet_seq));
2373 if (!mdev->meta.socket || mdev->state.conn < C_CONNECTED)
2375 ok = drbd_send_cmd(mdev, USE_META_SOCKET, cmd,
2376 (struct p_header80 *)&p, sizeof(p));
2380 /* dp->sector and dp->block_id already/still in network byte order,
2381 * data_size is payload size according to dp->head,
2382 * and may need to be corrected for digest size. */
2383 int drbd_send_ack_dp(struct drbd_conf *mdev, enum drbd_packets cmd,
2384 struct p_data *dp, int data_size)
2386 data_size -= (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ?
2387 crypto_hash_digestsize(mdev->integrity_r_tfm) : 0;
2388 return _drbd_send_ack(mdev, cmd, dp->sector, cpu_to_be32(data_size),
2392 int drbd_send_ack_rp(struct drbd_conf *mdev, enum drbd_packets cmd,
2393 struct p_block_req *rp)
2395 return _drbd_send_ack(mdev, cmd, rp->sector, rp->blksize, rp->block_id);
2399 * drbd_send_ack() - Sends an ack packet
2400 * @mdev: DRBD device.
2401 * @cmd: Packet command code.
2404 int drbd_send_ack(struct drbd_conf *mdev,
2405 enum drbd_packets cmd, struct drbd_epoch_entry *e)
2407 return _drbd_send_ack(mdev, cmd,
2408 cpu_to_be64(e->sector),
2409 cpu_to_be32(e->size),
2413 /* This function misuses the block_id field to signal if the blocks
2414 * are is sync or not. */
2415 int drbd_send_ack_ex(struct drbd_conf *mdev, enum drbd_packets cmd,
2416 sector_t sector, int blksize, u64 block_id)
2418 return _drbd_send_ack(mdev, cmd,
2419 cpu_to_be64(sector),
2420 cpu_to_be32(blksize),
2421 cpu_to_be64(block_id));
2424 int drbd_send_drequest(struct drbd_conf *mdev, int cmd,
2425 sector_t sector, int size, u64 block_id)
2428 struct p_block_req p;
2430 p.sector = cpu_to_be64(sector);
2431 p.block_id = block_id;
2432 p.blksize = cpu_to_be32(size);
2434 ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, cmd,
2435 (struct p_header80 *)&p, sizeof(p));
2439 int drbd_send_drequest_csum(struct drbd_conf *mdev,
2440 sector_t sector, int size,
2441 void *digest, int digest_size,
2442 enum drbd_packets cmd)
2445 struct p_block_req p;
2447 p.sector = cpu_to_be64(sector);
2448 p.block_id = BE_DRBD_MAGIC + 0xbeef;
2449 p.blksize = cpu_to_be32(size);
2451 p.head.magic = BE_DRBD_MAGIC;
2452 p.head.command = cpu_to_be16(cmd);
2453 p.head.length = cpu_to_be16(sizeof(p) - sizeof(struct p_header80) + digest_size);
2455 mutex_lock(&mdev->data.mutex);
2457 ok = (sizeof(p) == drbd_send(mdev, mdev->data.socket, &p, sizeof(p), 0));
2458 ok = ok && (digest_size == drbd_send(mdev, mdev->data.socket, digest, digest_size, 0));
2460 mutex_unlock(&mdev->data.mutex);
2465 int drbd_send_ov_request(struct drbd_conf *mdev, sector_t sector, int size)
2468 struct p_block_req p;
2470 p.sector = cpu_to_be64(sector);
2471 p.block_id = BE_DRBD_MAGIC + 0xbabe;
2472 p.blksize = cpu_to_be32(size);
2474 ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_OV_REQUEST,
2475 (struct p_header80 *)&p, sizeof(p));
2479 /* called on sndtimeo
2480 * returns false if we should retry,
2481 * true if we think connection is dead
2483 static int we_should_drop_the_connection(struct drbd_conf *mdev, struct socket *sock)
2486 /* long elapsed = (long)(jiffies - mdev->last_received); */
2488 drop_it = mdev->meta.socket == sock
2489 || !mdev->asender.task
2490 || get_t_state(&mdev->asender) != Running
2491 || mdev->state.conn < C_CONNECTED;
2496 drop_it = !--mdev->ko_count;
2498 dev_err(DEV, "[%s/%d] sock_sendmsg time expired, ko = %u\n",
2499 current->comm, current->pid, mdev->ko_count);
2503 return drop_it; /* && (mdev->state == R_PRIMARY) */;
2506 /* The idea of sendpage seems to be to put some kind of reference
2507 * to the page into the skb, and to hand it over to the NIC. In
2508 * this process get_page() gets called.
2510 * As soon as the page was really sent over the network put_page()
2511 * gets called by some part of the network layer. [ NIC driver? ]
2513 * [ get_page() / put_page() increment/decrement the count. If count
2514 * reaches 0 the page will be freed. ]
2516 * This works nicely with pages from FSs.
2517 * But this means that in protocol A we might signal IO completion too early!
2519 * In order not to corrupt data during a resync we must make sure
2520 * that we do not reuse our own buffer pages (EEs) to early, therefore
2521 * we have the net_ee list.
2523 * XFS seems to have problems, still, it submits pages with page_count == 0!
2524 * As a workaround, we disable sendpage on pages
2525 * with page_count == 0 or PageSlab.
2527 static int _drbd_no_send_page(struct drbd_conf *mdev, struct page *page,
2528 int offset, size_t size, unsigned msg_flags)
2530 int sent = drbd_send(mdev, mdev->data.socket, kmap(page) + offset, size, msg_flags);
2533 mdev->send_cnt += size>>9;
2534 return sent == size;
2537 static int _drbd_send_page(struct drbd_conf *mdev, struct page *page,
2538 int offset, size_t size, unsigned msg_flags)
2540 mm_segment_t oldfs = get_fs();
2544 /* e.g. XFS meta- & log-data is in slab pages, which have a
2545 * page_count of 0 and/or have PageSlab() set.
2546 * we cannot use send_page for those, as that does get_page();
2547 * put_page(); and would cause either a VM_BUG directly, or
2548 * __page_cache_release a page that would actually still be referenced
2549 * by someone, leading to some obscure delayed Oops somewhere else. */
2550 if (disable_sendpage || (page_count(page) < 1) || PageSlab(page))
2551 return _drbd_no_send_page(mdev, page, offset, size, msg_flags);
2553 msg_flags |= MSG_NOSIGNAL;
2554 drbd_update_congested(mdev);
2557 sent = mdev->data.socket->ops->sendpage(mdev->data.socket, page,
2560 if (sent == -EAGAIN) {
2561 if (we_should_drop_the_connection(mdev,
2568 dev_warn(DEV, "%s: size=%d len=%d sent=%d\n",
2569 __func__, (int)size, len, sent);
2574 } while (len > 0 /* THINK && mdev->cstate >= C_CONNECTED*/);
2576 clear_bit(NET_CONGESTED, &mdev->flags);
2580 mdev->send_cnt += size>>9;
2584 static int _drbd_send_bio(struct drbd_conf *mdev, struct bio *bio)
2586 struct bio_vec *bvec;
2588 /* hint all but last page with MSG_MORE */
2589 __bio_for_each_segment(bvec, bio, i, 0) {
2590 if (!_drbd_no_send_page(mdev, bvec->bv_page,
2591 bvec->bv_offset, bvec->bv_len,
2592 i == bio->bi_vcnt -1 ? 0 : MSG_MORE))
2598 static int _drbd_send_zc_bio(struct drbd_conf *mdev, struct bio *bio)
2600 struct bio_vec *bvec;
2602 /* hint all but last page with MSG_MORE */
2603 __bio_for_each_segment(bvec, bio, i, 0) {
2604 if (!_drbd_send_page(mdev, bvec->bv_page,
2605 bvec->bv_offset, bvec->bv_len,
2606 i == bio->bi_vcnt -1 ? 0 : MSG_MORE))
2612 static int _drbd_send_zc_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e)
2614 struct page *page = e->pages;
2615 unsigned len = e->size;
2616 /* hint all but last page with MSG_MORE */
2617 page_chain_for_each(page) {
2618 unsigned l = min_t(unsigned, len, PAGE_SIZE);
2619 if (!_drbd_send_page(mdev, page, 0, l,
2620 page_chain_next(page) ? MSG_MORE : 0))
2627 static u32 bio_flags_to_wire(struct drbd_conf *mdev, unsigned long bi_rw)
2629 if (mdev->agreed_pro_version >= 95)
2630 return (bi_rw & REQ_SYNC ? DP_RW_SYNC : 0) |
2631 (bi_rw & REQ_FUA ? DP_FUA : 0) |
2632 (bi_rw & REQ_FLUSH ? DP_FLUSH : 0) |
2633 (bi_rw & REQ_DISCARD ? DP_DISCARD : 0);
2635 return bi_rw & REQ_SYNC ? DP_RW_SYNC : 0;
2638 /* Used to send write requests
2639 * R_PRIMARY -> Peer (P_DATA)
2641 int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req)
2645 unsigned int dp_flags = 0;
2649 if (!drbd_get_data_sock(mdev))
2652 dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_w_tfm) ?
2653 crypto_hash_digestsize(mdev->integrity_w_tfm) : 0;
2655 if (req->size <= DRBD_MAX_SIZE_H80_PACKET) {
2656 p.head.h80.magic = BE_DRBD_MAGIC;
2657 p.head.h80.command = cpu_to_be16(P_DATA);
2659 cpu_to_be16(sizeof(p) - sizeof(union p_header) + dgs + req->size);
2661 p.head.h95.magic = BE_DRBD_MAGIC_BIG;
2662 p.head.h95.command = cpu_to_be16(P_DATA);
2664 cpu_to_be32(sizeof(p) - sizeof(union p_header) + dgs + req->size);
2667 p.sector = cpu_to_be64(req->sector);
2668 p.block_id = (unsigned long)req;
2669 p.seq_num = cpu_to_be32(req->seq_num =
2670 atomic_add_return(1, &mdev->packet_seq));
2672 dp_flags = bio_flags_to_wire(mdev, req->master_bio->bi_rw);
2674 if (mdev->state.conn >= C_SYNC_SOURCE &&
2675 mdev->state.conn <= C_PAUSED_SYNC_T)
2676 dp_flags |= DP_MAY_SET_IN_SYNC;
2678 p.dp_flags = cpu_to_be32(dp_flags);
2679 set_bit(UNPLUG_REMOTE, &mdev->flags);
2681 drbd_send(mdev, mdev->data.socket, &p, sizeof(p), dgs ? MSG_MORE : 0));
2683 dgb = mdev->int_dig_out;
2684 drbd_csum_bio(mdev, mdev->integrity_w_tfm, req->master_bio, dgb);
2685 ok = dgs == drbd_send(mdev, mdev->data.socket, dgb, dgs, 0);
2688 /* For protocol A, we have to memcpy the payload into
2689 * socket buffers, as we may complete right away
2690 * as soon as we handed it over to tcp, at which point the data
2691 * pages may become invalid.
2693 * For data-integrity enabled, we copy it as well, so we can be
2694 * sure that even if the bio pages may still be modified, it
2695 * won't change the data on the wire, thus if the digest checks
2696 * out ok after sending on this side, but does not fit on the
2697 * receiving side, we sure have detected corruption elsewhere.
2699 if (mdev->net_conf->wire_protocol == DRBD_PROT_A || dgs)
2700 ok = _drbd_send_bio(mdev, req->master_bio);
2702 ok = _drbd_send_zc_bio(mdev, req->master_bio);
2704 /* double check digest, sometimes buffers have been modified in flight. */
2705 if (dgs > 0 && dgs <= 64) {
2706 /* 64 byte, 512 bit, is the larges digest size
2707 * currently supported in kernel crypto. */
2708 unsigned char digest[64];
2709 drbd_csum_bio(mdev, mdev->integrity_w_tfm, req->master_bio, digest);
2710 if (memcmp(mdev->int_dig_out, digest, dgs)) {
2712 "Digest mismatch, buffer modified by upper layers during write: %llus +%u\n",
2713 (unsigned long long)req->sector, req->size);
2715 } /* else if (dgs > 64) {
2716 ... Be noisy about digest too large ...
2720 drbd_put_data_sock(mdev);
2725 /* answer packet, used to send data back for read requests:
2726 * Peer -> (diskless) R_PRIMARY (P_DATA_REPLY)
2727 * C_SYNC_SOURCE -> C_SYNC_TARGET (P_RS_DATA_REPLY)
2729 int drbd_send_block(struct drbd_conf *mdev, enum drbd_packets cmd,
2730 struct drbd_epoch_entry *e)
2737 dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_w_tfm) ?
2738 crypto_hash_digestsize(mdev->integrity_w_tfm) : 0;
2740 if (e->size <= DRBD_MAX_SIZE_H80_PACKET) {
2741 p.head.h80.magic = BE_DRBD_MAGIC;
2742 p.head.h80.command = cpu_to_be16(cmd);
2744 cpu_to_be16(sizeof(p) - sizeof(struct p_header80) + dgs + e->size);
2746 p.head.h95.magic = BE_DRBD_MAGIC_BIG;
2747 p.head.h95.command = cpu_to_be16(cmd);
2749 cpu_to_be32(sizeof(p) - sizeof(struct p_header80) + dgs + e->size);
2752 p.sector = cpu_to_be64(e->sector);
2753 p.block_id = e->block_id;
2754 /* p.seq_num = 0; No sequence numbers here.. */
2756 /* Only called by our kernel thread.
2757 * This one may be interrupted by DRBD_SIG and/or DRBD_SIGKILL
2758 * in response to admin command or module unload.
2760 if (!drbd_get_data_sock(mdev))
2763 ok = sizeof(p) == drbd_send(mdev, mdev->data.socket, &p, sizeof(p), dgs ? MSG_MORE : 0);
2765 dgb = mdev->int_dig_out;
2766 drbd_csum_ee(mdev, mdev->integrity_w_tfm, e, dgb);
2767 ok = dgs == drbd_send(mdev, mdev->data.socket, dgb, dgs, 0);
2770 ok = _drbd_send_zc_ee(mdev, e);
2772 drbd_put_data_sock(mdev);
2777 int drbd_send_oos(struct drbd_conf *mdev, struct drbd_request *req)
2779 struct p_block_desc p;
2781 p.sector = cpu_to_be64(req->sector);
2782 p.blksize = cpu_to_be32(req->size);
2784 return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_OUT_OF_SYNC, &p.head, sizeof(p));
2788 drbd_send distinguishes two cases:
2790 Packets sent via the data socket "sock"
2791 and packets sent via the meta data socket "msock"
2794 -----------------+-------------------------+------------------------------
2795 timeout conf.timeout / 2 conf.timeout / 2
2796 timeout action send a ping via msock Abort communication
2797 and close all sockets
2801 * you must have down()ed the appropriate [m]sock_mutex elsewhere!
2803 int drbd_send(struct drbd_conf *mdev, struct socket *sock,
2804 void *buf, size_t size, unsigned msg_flags)
2813 /* THINK if (signal_pending) return ... ? */
2818 msg.msg_name = NULL;
2819 msg.msg_namelen = 0;
2820 msg.msg_control = NULL;
2821 msg.msg_controllen = 0;
2822 msg.msg_flags = msg_flags | MSG_NOSIGNAL;
2824 if (sock == mdev->data.socket) {
2825 mdev->ko_count = mdev->net_conf->ko_count;
2826 drbd_update_congested(mdev);
2830 * tcp_sendmsg does _not_ use its size parameter at all ?
2832 * -EAGAIN on timeout, -EINTR on signal.
2835 * do we need to block DRBD_SIG if sock == &meta.socket ??
2836 * otherwise wake_asender() might interrupt some send_*Ack !
2838 rv = kernel_sendmsg(sock, &msg, &iov, 1, size);
2839 if (rv == -EAGAIN) {
2840 if (we_should_drop_the_connection(mdev, sock))
2847 flush_signals(current);
2855 } while (sent < size);
2857 if (sock == mdev->data.socket)
2858 clear_bit(NET_CONGESTED, &mdev->flags);
2861 if (rv != -EAGAIN) {
2862 dev_err(DEV, "%s_sendmsg returned %d\n",
2863 sock == mdev->meta.socket ? "msock" : "sock",
2865 drbd_force_state(mdev, NS(conn, C_BROKEN_PIPE));
2867 drbd_force_state(mdev, NS(conn, C_TIMEOUT));
2873 static int drbd_open(struct block_device *bdev, fmode_t mode)
2875 struct drbd_conf *mdev = bdev->bd_disk->private_data;
2876 unsigned long flags;
2879 mutex_lock(&drbd_main_mutex);
2880 spin_lock_irqsave(&mdev->req_lock, flags);
2881 /* to have a stable mdev->state.role
2882 * and no race with updating open_cnt */
2884 if (mdev->state.role != R_PRIMARY) {
2885 if (mode & FMODE_WRITE)
2887 else if (!allow_oos)
2893 spin_unlock_irqrestore(&mdev->req_lock, flags);
2894 mutex_unlock(&drbd_main_mutex);
2899 static int drbd_release(struct gendisk *gd, fmode_t mode)
2901 struct drbd_conf *mdev = gd->private_data;
2902 mutex_lock(&drbd_main_mutex);
2904 mutex_unlock(&drbd_main_mutex);
2908 static void drbd_set_defaults(struct drbd_conf *mdev)
2910 /* This way we get a compile error when sync_conf grows,
2911 and we forgot to initialize it here */
2912 mdev->sync_conf = (struct syncer_conf) {
2913 /* .rate = */ DRBD_RATE_DEF,
2914 /* .after = */ DRBD_AFTER_DEF,
2915 /* .al_extents = */ DRBD_AL_EXTENTS_DEF,
2916 /* .verify_alg = */ {}, 0,
2917 /* .cpu_mask = */ {}, 0,
2918 /* .csums_alg = */ {}, 0,
2920 /* .on_no_data = */ DRBD_ON_NO_DATA_DEF,
2921 /* .c_plan_ahead = */ DRBD_C_PLAN_AHEAD_DEF,
2922 /* .c_delay_target = */ DRBD_C_DELAY_TARGET_DEF,
2923 /* .c_fill_target = */ DRBD_C_FILL_TARGET_DEF,
2924 /* .c_max_rate = */ DRBD_C_MAX_RATE_DEF,
2925 /* .c_min_rate = */ DRBD_C_MIN_RATE_DEF
2928 /* Have to use that way, because the layout differs between
2929 big endian and little endian */
2930 mdev->state = (union drbd_state) {
2931 { .role = R_SECONDARY,
2933 .conn = C_STANDALONE,
2942 void drbd_init_set_defaults(struct drbd_conf *mdev)
2944 /* the memset(,0,) did most of this.
2945 * note: only assignments, no allocation in here */
2947 drbd_set_defaults(mdev);
2949 atomic_set(&mdev->ap_bio_cnt, 0);
2950 atomic_set(&mdev->ap_pending_cnt, 0);
2951 atomic_set(&mdev->rs_pending_cnt, 0);
2952 atomic_set(&mdev->unacked_cnt, 0);
2953 atomic_set(&mdev->local_cnt, 0);
2954 atomic_set(&mdev->net_cnt, 0);
2955 atomic_set(&mdev->packet_seq, 0);
2956 atomic_set(&mdev->pp_in_use, 0);
2957 atomic_set(&mdev->pp_in_use_by_net, 0);
2958 atomic_set(&mdev->rs_sect_in, 0);
2959 atomic_set(&mdev->rs_sect_ev, 0);
2960 atomic_set(&mdev->ap_in_flight, 0);
2962 mutex_init(&mdev->md_io_mutex);
2963 mutex_init(&mdev->data.mutex);
2964 mutex_init(&mdev->meta.mutex);
2965 sema_init(&mdev->data.work.s, 0);
2966 sema_init(&mdev->meta.work.s, 0);
2967 mutex_init(&mdev->state_mutex);
2969 spin_lock_init(&mdev->data.work.q_lock);
2970 spin_lock_init(&mdev->meta.work.q_lock);
2972 spin_lock_init(&mdev->al_lock);
2973 spin_lock_init(&mdev->req_lock);
2974 spin_lock_init(&mdev->peer_seq_lock);
2975 spin_lock_init(&mdev->epoch_lock);
2977 INIT_LIST_HEAD(&mdev->active_ee);
2978 INIT_LIST_HEAD(&mdev->sync_ee);
2979 INIT_LIST_HEAD(&mdev->done_ee);
2980 INIT_LIST_HEAD(&mdev->read_ee);
2981 INIT_LIST_HEAD(&mdev->net_ee);
2982 INIT_LIST_HEAD(&mdev->resync_reads);
2983 INIT_LIST_HEAD(&mdev->data.work.q);
2984 INIT_LIST_HEAD(&mdev->meta.work.q);
2985 INIT_LIST_HEAD(&mdev->resync_work.list);
2986 INIT_LIST_HEAD(&mdev->unplug_work.list);
2987 INIT_LIST_HEAD(&mdev->go_diskless.list);
2988 INIT_LIST_HEAD(&mdev->md_sync_work.list);
2989 INIT_LIST_HEAD(&mdev->start_resync_work.list);
2990 INIT_LIST_HEAD(&mdev->bm_io_work.w.list);
2992 mdev->resync_work.cb = w_resync_timer;
2993 mdev->unplug_work.cb = w_send_write_hint;
2994 mdev->go_diskless.cb = w_go_diskless;
2995 mdev->md_sync_work.cb = w_md_sync;
2996 mdev->bm_io_work.w.cb = w_bitmap_io;
2997 mdev->start_resync_work.cb = w_start_resync;
2998 init_timer(&mdev->resync_timer);
2999 init_timer(&mdev->md_sync_timer);
3000 init_timer(&mdev->start_resync_timer);
3001 mdev->resync_timer.function = resync_timer_fn;
3002 mdev->resync_timer.data = (unsigned long) mdev;
3003 mdev->md_sync_timer.function = md_sync_timer_fn;
3004 mdev->md_sync_timer.data = (unsigned long) mdev;
3005 mdev->start_resync_timer.function = start_resync_timer_fn;
3006 mdev->start_resync_timer.data = (unsigned long) mdev;
3008 init_waitqueue_head(&mdev->misc_wait);
3009 init_waitqueue_head(&mdev->state_wait);
3010 init_waitqueue_head(&mdev->net_cnt_wait);
3011 init_waitqueue_head(&mdev->ee_wait);
3012 init_waitqueue_head(&mdev->al_wait);
3013 init_waitqueue_head(&mdev->seq_wait);
3015 drbd_thread_init(mdev, &mdev->receiver, drbdd_init);
3016 drbd_thread_init(mdev, &mdev->worker, drbd_worker);
3017 drbd_thread_init(mdev, &mdev->asender, drbd_asender);
3019 mdev->agreed_pro_version = PRO_VERSION_MAX;
3020 mdev->write_ordering = WO_bdev_flush;
3021 mdev->resync_wenr = LC_FREE;
3024 void drbd_mdev_cleanup(struct drbd_conf *mdev)
3027 if (mdev->receiver.t_state != None)
3028 dev_err(DEV, "ASSERT FAILED: receiver t_state == %d expected 0.\n",
3029 mdev->receiver.t_state);
3031 /* no need to lock it, I'm the only thread alive */
3032 if (atomic_read(&mdev->current_epoch->epoch_size) != 0)
3033 dev_err(DEV, "epoch_size:%d\n", atomic_read(&mdev->current_epoch->epoch_size));
3043 mdev->rs_failed = 0;
3044 mdev->rs_last_events = 0;
3045 mdev->rs_last_sect_ev = 0;
3046 for (i = 0; i < DRBD_SYNC_MARKS; i++) {
3047 mdev->rs_mark_left[i] = 0;
3048 mdev->rs_mark_time[i] = 0;
3050 D_ASSERT(mdev->net_conf == NULL);
3052 drbd_set_my_capacity(mdev, 0);
3054 /* maybe never allocated. */
3055 drbd_bm_resize(mdev, 0, 1);
3056 drbd_bm_cleanup(mdev);
3059 drbd_free_resources(mdev);
3060 clear_bit(AL_SUSPENDED, &mdev->flags);
3063 * currently we drbd_init_ee only on module load, so
3064 * we may do drbd_release_ee only on module unload!
3066 D_ASSERT(list_empty(&mdev->active_ee));
3067 D_ASSERT(list_empty(&mdev->sync_ee));
3068 D_ASSERT(list_empty(&mdev->done_ee));
3069 D_ASSERT(list_empty(&mdev->read_ee));
3070 D_ASSERT(list_empty(&mdev->net_ee));
3071 D_ASSERT(list_empty(&mdev->resync_reads));
3072 D_ASSERT(list_empty(&mdev->data.work.q));
3073 D_ASSERT(list_empty(&mdev->meta.work.q));
3074 D_ASSERT(list_empty(&mdev->resync_work.list));
3075 D_ASSERT(list_empty(&mdev->unplug_work.list));
3076 D_ASSERT(list_empty(&mdev->go_diskless.list));
3078 drbd_set_defaults(mdev);
3082 static void drbd_destroy_mempools(void)
3086 while (drbd_pp_pool) {
3087 page = drbd_pp_pool;
3088 drbd_pp_pool = (struct page *)page_private(page);
3093 /* D_ASSERT(atomic_read(&drbd_pp_vacant)==0); */
3095 if (drbd_ee_mempool)
3096 mempool_destroy(drbd_ee_mempool);
3097 if (drbd_request_mempool)
3098 mempool_destroy(drbd_request_mempool);
3100 kmem_cache_destroy(drbd_ee_cache);
3101 if (drbd_request_cache)
3102 kmem_cache_destroy(drbd_request_cache);
3103 if (drbd_bm_ext_cache)
3104 kmem_cache_destroy(drbd_bm_ext_cache);
3105 if (drbd_al_ext_cache)
3106 kmem_cache_destroy(drbd_al_ext_cache);
3108 drbd_ee_mempool = NULL;
3109 drbd_request_mempool = NULL;
3110 drbd_ee_cache = NULL;
3111 drbd_request_cache = NULL;
3112 drbd_bm_ext_cache = NULL;
3113 drbd_al_ext_cache = NULL;
3118 static int drbd_create_mempools(void)
3121 const int number = (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * minor_count;
3124 /* prepare our caches and mempools */
3125 drbd_request_mempool = NULL;
3126 drbd_ee_cache = NULL;
3127 drbd_request_cache = NULL;
3128 drbd_bm_ext_cache = NULL;
3129 drbd_al_ext_cache = NULL;
3130 drbd_pp_pool = NULL;
3133 drbd_request_cache = kmem_cache_create(
3134 "drbd_req", sizeof(struct drbd_request), 0, 0, NULL);
3135 if (drbd_request_cache == NULL)
3138 drbd_ee_cache = kmem_cache_create(
3139 "drbd_ee", sizeof(struct drbd_epoch_entry), 0, 0, NULL);
3140 if (drbd_ee_cache == NULL)
3143 drbd_bm_ext_cache = kmem_cache_create(
3144 "drbd_bm", sizeof(struct bm_extent), 0, 0, NULL);
3145 if (drbd_bm_ext_cache == NULL)
3148 drbd_al_ext_cache = kmem_cache_create(
3149 "drbd_al", sizeof(struct lc_element), 0, 0, NULL);
3150 if (drbd_al_ext_cache == NULL)
3154 drbd_request_mempool = mempool_create(number,
3155 mempool_alloc_slab, mempool_free_slab, drbd_request_cache);
3156 if (drbd_request_mempool == NULL)
3159 drbd_ee_mempool = mempool_create(number,
3160 mempool_alloc_slab, mempool_free_slab, drbd_ee_cache);
3161 if (drbd_ee_mempool == NULL)
3164 /* drbd's page pool */
3165 spin_lock_init(&drbd_pp_lock);
3167 for (i = 0; i < number; i++) {
3168 page = alloc_page(GFP_HIGHUSER);
3171 set_page_private(page, (unsigned long)drbd_pp_pool);
3172 drbd_pp_pool = page;
3174 drbd_pp_vacant = number;
3179 drbd_destroy_mempools(); /* in case we allocated some */
3183 static int drbd_notify_sys(struct notifier_block *this, unsigned long code,
3186 /* just so we have it. you never know what interesting things we
3187 * might want to do here some day...
3193 static struct notifier_block drbd_notifier = {
3194 .notifier_call = drbd_notify_sys,
3197 static void drbd_release_ee_lists(struct drbd_conf *mdev)
3201 rr = drbd_release_ee(mdev, &mdev->active_ee);
3203 dev_err(DEV, "%d EEs in active list found!\n", rr);
3205 rr = drbd_release_ee(mdev, &mdev->sync_ee);
3207 dev_err(DEV, "%d EEs in sync list found!\n", rr);
3209 rr = drbd_release_ee(mdev, &mdev->read_ee);
3211 dev_err(DEV, "%d EEs in read list found!\n", rr);
3213 rr = drbd_release_ee(mdev, &mdev->done_ee);
3215 dev_err(DEV, "%d EEs in done list found!\n", rr);
3217 rr = drbd_release_ee(mdev, &mdev->net_ee);
3219 dev_err(DEV, "%d EEs in net list found!\n", rr);
3222 /* caution. no locking.
3223 * currently only used from module cleanup code. */
3224 static void drbd_delete_device(unsigned int minor)
3226 struct drbd_conf *mdev = minor_to_mdev(minor);
3231 /* paranoia asserts */
3232 if (mdev->open_cnt != 0)
3233 dev_err(DEV, "open_cnt = %d in %s:%u", mdev->open_cnt,
3234 __FILE__ , __LINE__);
3236 ERR_IF (!list_empty(&mdev->data.work.q)) {
3237 struct list_head *lp;
3238 list_for_each(lp, &mdev->data.work.q) {
3239 dev_err(DEV, "lp = %p\n", lp);
3242 /* end paranoia asserts */
3244 del_gendisk(mdev->vdisk);
3246 /* cleanup stuff that may have been allocated during
3247 * device (re-)configuration or state changes */
3249 if (mdev->this_bdev)
3250 bdput(mdev->this_bdev);
3252 drbd_free_resources(mdev);
3254 drbd_release_ee_lists(mdev);
3256 /* should be free'd on disconnect? */
3257 kfree(mdev->ee_hash);
3259 mdev->ee_hash_s = 0;
3260 mdev->ee_hash = NULL;
3263 lc_destroy(mdev->act_log);
3264 lc_destroy(mdev->resync);
3266 kfree(mdev->p_uuid);
3267 /* mdev->p_uuid = NULL; */
3269 kfree(mdev->int_dig_out);
3270 kfree(mdev->int_dig_in);
3271 kfree(mdev->int_dig_vv);
3273 /* cleanup the rest that has been
3274 * allocated from drbd_new_device
3275 * and actually free the mdev itself */
3276 drbd_free_mdev(mdev);
3279 static void drbd_cleanup(void)
3283 unregister_reboot_notifier(&drbd_notifier);
3285 /* first remove proc,
3286 * drbdsetup uses it's presence to detect
3287 * whether DRBD is loaded.
3288 * If we would get stuck in proc removal,
3289 * but have netlink already deregistered,
3290 * some drbdsetup commands may wait forever
3294 remove_proc_entry("drbd", NULL);
3301 drbd_delete_device(i);
3302 drbd_destroy_mempools();
3307 unregister_blkdev(DRBD_MAJOR, "drbd");
3309 printk(KERN_INFO "drbd: module cleanup done.\n");
3313 * drbd_congested() - Callback for pdflush
3314 * @congested_data: User data
3315 * @bdi_bits: Bits pdflush is currently interested in
3317 * Returns 1<<BDI_async_congested and/or 1<<BDI_sync_congested if we are congested.
3319 static int drbd_congested(void *congested_data, int bdi_bits)
3321 struct drbd_conf *mdev = congested_data;
3322 struct request_queue *q;
3326 if (!may_inc_ap_bio(mdev)) {
3327 /* DRBD has frozen IO */
3333 if (get_ldev(mdev)) {
3334 q = bdev_get_queue(mdev->ldev->backing_bdev);
3335 r = bdi_congested(&q->backing_dev_info, bdi_bits);
3341 if (bdi_bits & (1 << BDI_async_congested) && test_bit(NET_CONGESTED, &mdev->flags)) {
3342 r |= (1 << BDI_async_congested);
3343 reason = reason == 'b' ? 'a' : 'n';
3347 mdev->congestion_reason = reason;
3351 struct drbd_conf *drbd_new_device(unsigned int minor)
3353 struct drbd_conf *mdev;
3354 struct gendisk *disk;
3355 struct request_queue *q;
3357 /* GFP_KERNEL, we are outside of all write-out paths */
3358 mdev = kzalloc(sizeof(struct drbd_conf), GFP_KERNEL);
3361 if (!zalloc_cpumask_var(&mdev->cpu_mask, GFP_KERNEL))
3362 goto out_no_cpumask;
3364 mdev->minor = minor;
3366 drbd_init_set_defaults(mdev);
3368 q = blk_alloc_queue(GFP_KERNEL);
3372 q->queuedata = mdev;
3374 disk = alloc_disk(1);
3379 set_disk_ro(disk, true);
3382 disk->major = DRBD_MAJOR;
3383 disk->first_minor = minor;
3384 disk->fops = &drbd_ops;
3385 sprintf(disk->disk_name, "drbd%d", minor);
3386 disk->private_data = mdev;
3388 mdev->this_bdev = bdget(MKDEV(DRBD_MAJOR, minor));
3389 /* we have no partitions. we contain only ourselves. */
3390 mdev->this_bdev->bd_contains = mdev->this_bdev;
3392 q->backing_dev_info.congested_fn = drbd_congested;
3393 q->backing_dev_info.congested_data = mdev;
3395 blk_queue_make_request(q, drbd_make_request);
3396 blk_queue_max_hw_sectors(q, DRBD_MAX_BIO_SIZE >> 9);
3397 blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
3398 blk_queue_merge_bvec(q, drbd_merge_bvec);
3399 q->queue_lock = &mdev->req_lock;
3401 mdev->md_io_page = alloc_page(GFP_KERNEL);
3402 if (!mdev->md_io_page)
3403 goto out_no_io_page;
3405 if (drbd_bm_init(mdev))
3407 /* no need to lock access, we are still initializing this minor device. */
3411 mdev->app_reads_hash = kzalloc(APP_R_HSIZE*sizeof(void *), GFP_KERNEL);
3412 if (!mdev->app_reads_hash)
3413 goto out_no_app_reads;
3415 mdev->current_epoch = kzalloc(sizeof(struct drbd_epoch), GFP_KERNEL);
3416 if (!mdev->current_epoch)
3419 INIT_LIST_HEAD(&mdev->current_epoch->list);
3424 /* out_whatever_else:
3425 kfree(mdev->current_epoch); */
3427 kfree(mdev->app_reads_hash);
3431 drbd_bm_cleanup(mdev);
3433 __free_page(mdev->md_io_page);
3437 blk_cleanup_queue(q);
3439 free_cpumask_var(mdev->cpu_mask);
3445 /* counterpart of drbd_new_device.
3446 * last part of drbd_delete_device. */
3447 void drbd_free_mdev(struct drbd_conf *mdev)
3449 kfree(mdev->current_epoch);
3450 kfree(mdev->app_reads_hash);
3452 if (mdev->bitmap) /* should no longer be there. */
3453 drbd_bm_cleanup(mdev);
3454 __free_page(mdev->md_io_page);
3455 put_disk(mdev->vdisk);
3456 blk_cleanup_queue(mdev->rq_queue);
3457 free_cpumask_var(mdev->cpu_mask);
3458 drbd_free_tl_hash(mdev);
3463 int __init drbd_init(void)
3467 if (sizeof(struct p_handshake) != 80) {
3469 "drbd: never change the size or layout "
3470 "of the HandShake packet.\n");
3474 if (minor_count < DRBD_MINOR_COUNT_MIN || minor_count > DRBD_MINOR_COUNT_MAX) {
3476 "drbd: invalid minor_count (%d)\n", minor_count);
3484 err = drbd_nl_init();
3488 err = register_blkdev(DRBD_MAJOR, "drbd");
3491 "drbd: unable to register block device major %d\n",
3496 register_reboot_notifier(&drbd_notifier);
3499 * allocate all necessary structs
3503 init_waitqueue_head(&drbd_pp_wait);
3505 drbd_proc = NULL; /* play safe for drbd_cleanup */
3506 minor_table = kzalloc(sizeof(struct drbd_conf *)*minor_count,
3511 err = drbd_create_mempools();
3515 drbd_proc = proc_create_data("drbd", S_IFREG | S_IRUGO , NULL, &drbd_proc_fops, NULL);
3517 printk(KERN_ERR "drbd: unable to register proc file\n");
3521 rwlock_init(&global_state_lock);
3523 printk(KERN_INFO "drbd: initialized. "
3524 "Version: " REL_VERSION " (api:%d/proto:%d-%d)\n",
3525 API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX);
3526 printk(KERN_INFO "drbd: %s\n", drbd_buildtag());
3527 printk(KERN_INFO "drbd: registered as block device major %d\n",
3529 printk(KERN_INFO "drbd: minor_table @ 0x%p\n", minor_table);
3531 return 0; /* Success! */
3536 /* currently always the case */
3537 printk(KERN_ERR "drbd: ran out of memory\n");
3539 printk(KERN_ERR "drbd: initialization failure\n");
3543 void drbd_free_bc(struct drbd_backing_dev *ldev)
3548 blkdev_put(ldev->backing_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
3549 blkdev_put(ldev->md_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
3554 void drbd_free_sock(struct drbd_conf *mdev)
3556 if (mdev->data.socket) {
3557 mutex_lock(&mdev->data.mutex);
3558 kernel_sock_shutdown(mdev->data.socket, SHUT_RDWR);
3559 sock_release(mdev->data.socket);
3560 mdev->data.socket = NULL;
3561 mutex_unlock(&mdev->data.mutex);
3563 if (mdev->meta.socket) {
3564 mutex_lock(&mdev->meta.mutex);
3565 kernel_sock_shutdown(mdev->meta.socket, SHUT_RDWR);
3566 sock_release(mdev->meta.socket);
3567 mdev->meta.socket = NULL;
3568 mutex_unlock(&mdev->meta.mutex);
3573 void drbd_free_resources(struct drbd_conf *mdev)
3575 crypto_free_hash(mdev->csums_tfm);
3576 mdev->csums_tfm = NULL;
3577 crypto_free_hash(mdev->verify_tfm);
3578 mdev->verify_tfm = NULL;
3579 crypto_free_hash(mdev->cram_hmac_tfm);
3580 mdev->cram_hmac_tfm = NULL;
3581 crypto_free_hash(mdev->integrity_w_tfm);
3582 mdev->integrity_w_tfm = NULL;
3583 crypto_free_hash(mdev->integrity_r_tfm);
3584 mdev->integrity_r_tfm = NULL;
3586 drbd_free_sock(mdev);
3589 drbd_free_bc(mdev->ldev);
3590 mdev->ldev = NULL;);
3593 /* meta data management */
3595 struct meta_data_on_disk {
3596 u64 la_size; /* last agreed size. */
3597 u64 uuid[UI_SIZE]; /* UUIDs. */
3600 u32 flags; /* MDF */
3603 u32 al_offset; /* offset to this block */
3604 u32 al_nr_extents; /* important for restoring the AL */
3605 /* `-- act_log->nr_elements <-- sync_conf.al_extents */
3606 u32 bm_offset; /* offset to the bitmap, from here */
3607 u32 bm_bytes_per_bit; /* BM_BLOCK_SIZE */
3608 u32 reserved_u32[4];
3613 * drbd_md_sync() - Writes the meta data super block if the MD_DIRTY flag bit is set
3614 * @mdev: DRBD device.
3616 void drbd_md_sync(struct drbd_conf *mdev)
3618 struct meta_data_on_disk *buffer;
3622 del_timer(&mdev->md_sync_timer);
3623 /* timer may be rearmed by drbd_md_mark_dirty() now. */
3624 if (!test_and_clear_bit(MD_DIRTY, &mdev->flags))
3627 /* We use here D_FAILED and not D_ATTACHING because we try to write
3628 * metadata even if we detach due to a disk failure! */
3629 if (!get_ldev_if_state(mdev, D_FAILED))
3632 mutex_lock(&mdev->md_io_mutex);
3633 buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);
3634 memset(buffer, 0, 512);
3636 buffer->la_size = cpu_to_be64(drbd_get_capacity(mdev->this_bdev));
3637 for (i = UI_CURRENT; i < UI_SIZE; i++)
3638 buffer->uuid[i] = cpu_to_be64(mdev->ldev->md.uuid[i]);
3639 buffer->flags = cpu_to_be32(mdev->ldev->md.flags);
3640 buffer->magic = cpu_to_be32(DRBD_MD_MAGIC);
3642 buffer->md_size_sect = cpu_to_be32(mdev->ldev->md.md_size_sect);
3643 buffer->al_offset = cpu_to_be32(mdev->ldev->md.al_offset);
3644 buffer->al_nr_extents = cpu_to_be32(mdev->act_log->nr_elements);
3645 buffer->bm_bytes_per_bit = cpu_to_be32(BM_BLOCK_SIZE);
3646 buffer->device_uuid = cpu_to_be64(mdev->ldev->md.device_uuid);
3648 buffer->bm_offset = cpu_to_be32(mdev->ldev->md.bm_offset);
3650 D_ASSERT(drbd_md_ss__(mdev, mdev->ldev) == mdev->ldev->md.md_offset);
3651 sector = mdev->ldev->md.md_offset;
3653 if (!drbd_md_sync_page_io(mdev, mdev->ldev, sector, WRITE)) {
3654 /* this was a try anyways ... */
3655 dev_err(DEV, "meta data update failed!\n");
3656 drbd_chk_io_error(mdev, 1, true);
3659 /* Update mdev->ldev->md.la_size_sect,
3660 * since we updated it on metadata. */
3661 mdev->ldev->md.la_size_sect = drbd_get_capacity(mdev->this_bdev);
3663 mutex_unlock(&mdev->md_io_mutex);
3668 * drbd_md_read() - Reads in the meta data super block
3669 * @mdev: DRBD device.
3670 * @bdev: Device from which the meta data should be read in.
3672 * Return 0 (NO_ERROR) on success, and an enum drbd_ret_code in case
3673 * something goes wrong. Currently only: ERR_IO_MD_DISK, ERR_MD_INVALID.
3675 int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
3677 struct meta_data_on_disk *buffer;
3678 int i, rv = NO_ERROR;
3680 if (!get_ldev_if_state(mdev, D_ATTACHING))
3681 return ERR_IO_MD_DISK;
3683 mutex_lock(&mdev->md_io_mutex);
3684 buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);
3686 if (!drbd_md_sync_page_io(mdev, bdev, bdev->md.md_offset, READ)) {
3687 /* NOTE: cant do normal error processing here as this is
3688 called BEFORE disk is attached */
3689 dev_err(DEV, "Error while reading metadata.\n");
3690 rv = ERR_IO_MD_DISK;
3694 if (be32_to_cpu(buffer->magic) != DRBD_MD_MAGIC) {
3695 dev_err(DEV, "Error while reading metadata, magic not found.\n");
3696 rv = ERR_MD_INVALID;
3699 if (be32_to_cpu(buffer->al_offset) != bdev->md.al_offset) {
3700 dev_err(DEV, "unexpected al_offset: %d (expected %d)\n",
3701 be32_to_cpu(buffer->al_offset), bdev->md.al_offset);
3702 rv = ERR_MD_INVALID;
3705 if (be32_to_cpu(buffer->bm_offset) != bdev->md.bm_offset) {
3706 dev_err(DEV, "unexpected bm_offset: %d (expected %d)\n",
3707 be32_to_cpu(buffer->bm_offset), bdev->md.bm_offset);
3708 rv = ERR_MD_INVALID;
3711 if (be32_to_cpu(buffer->md_size_sect) != bdev->md.md_size_sect) {
3712 dev_err(DEV, "unexpected md_size: %u (expected %u)\n",
3713 be32_to_cpu(buffer->md_size_sect), bdev->md.md_size_sect);
3714 rv = ERR_MD_INVALID;
3718 if (be32_to_cpu(buffer->bm_bytes_per_bit) != BM_BLOCK_SIZE) {
3719 dev_err(DEV, "unexpected bm_bytes_per_bit: %u (expected %u)\n",
3720 be32_to_cpu(buffer->bm_bytes_per_bit), BM_BLOCK_SIZE);
3721 rv = ERR_MD_INVALID;
3725 bdev->md.la_size_sect = be64_to_cpu(buffer->la_size);
3726 for (i = UI_CURRENT; i < UI_SIZE; i++)
3727 bdev->md.uuid[i] = be64_to_cpu(buffer->uuid[i]);
3728 bdev->md.flags = be32_to_cpu(buffer->flags);
3729 mdev->sync_conf.al_extents = be32_to_cpu(buffer->al_nr_extents);
3730 bdev->md.device_uuid = be64_to_cpu(buffer->device_uuid);
3732 if (mdev->sync_conf.al_extents < 7)
3733 mdev->sync_conf.al_extents = 127;
3736 mutex_unlock(&mdev->md_io_mutex);
3742 static void debug_drbd_uuid(struct drbd_conf *mdev, enum drbd_uuid_index index)
3744 static char *uuid_str[UI_EXTENDED_SIZE] = {
3745 [UI_CURRENT] = "CURRENT",
3746 [UI_BITMAP] = "BITMAP",
3747 [UI_HISTORY_START] = "HISTORY_START",
3748 [UI_HISTORY_END] = "HISTORY_END",
3750 [UI_FLAGS] = "FLAGS",
3753 if (index >= UI_EXTENDED_SIZE) {
3754 dev_warn(DEV, " uuid_index >= EXTENDED_SIZE\n");
3758 dynamic_dev_dbg(DEV, " uuid[%s] now %016llX\n",
3760 (unsigned long long)mdev->ldev->md.uuid[index]);
3765 * drbd_md_mark_dirty() - Mark meta data super block as dirty
3766 * @mdev: DRBD device.
3768 * Call this function if you change anything that should be written to
3769 * the meta-data super block. This function sets MD_DIRTY, and starts a
3770 * timer that ensures that within five seconds you have to call drbd_md_sync().
3773 void drbd_md_mark_dirty_(struct drbd_conf *mdev, unsigned int line, const char *func)
3775 if (!test_and_set_bit(MD_DIRTY, &mdev->flags)) {
3776 mod_timer(&mdev->md_sync_timer, jiffies + HZ);
3777 mdev->last_md_mark_dirty.line = line;
3778 mdev->last_md_mark_dirty.func = func;
3782 void drbd_md_mark_dirty(struct drbd_conf *mdev)
3784 if (!test_and_set_bit(MD_DIRTY, &mdev->flags))
3785 mod_timer(&mdev->md_sync_timer, jiffies + 5*HZ);
3789 static void drbd_uuid_move_history(struct drbd_conf *mdev) __must_hold(local)
3793 for (i = UI_HISTORY_START; i < UI_HISTORY_END; i++) {
3794 mdev->ldev->md.uuid[i+1] = mdev->ldev->md.uuid[i];
3795 debug_drbd_uuid(mdev, i+1);
3799 void _drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local)
3801 if (idx == UI_CURRENT) {
3802 if (mdev->state.role == R_PRIMARY)
3807 drbd_set_ed_uuid(mdev, val);
3810 mdev->ldev->md.uuid[idx] = val;
3811 debug_drbd_uuid(mdev, idx);
3812 drbd_md_mark_dirty(mdev);
3816 void drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local)
3818 if (mdev->ldev->md.uuid[idx]) {
3819 drbd_uuid_move_history(mdev);
3820 mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[idx];
3821 debug_drbd_uuid(mdev, UI_HISTORY_START);
3823 _drbd_uuid_set(mdev, idx, val);
3827 * drbd_uuid_new_current() - Creates a new current UUID
3828 * @mdev: DRBD device.
3830 * Creates a new current UUID, and rotates the old current UUID into
3831 * the bitmap slot. Causes an incremental resync upon next connect.
3833 void drbd_uuid_new_current(struct drbd_conf *mdev) __must_hold(local)
3837 dev_info(DEV, "Creating new current UUID\n");
3838 D_ASSERT(mdev->ldev->md.uuid[UI_BITMAP] == 0);
3839 mdev->ldev->md.uuid[UI_BITMAP] = mdev->ldev->md.uuid[UI_CURRENT];
3840 debug_drbd_uuid(mdev, UI_BITMAP);
3842 get_random_bytes(&val, sizeof(u64));
3843 _drbd_uuid_set(mdev, UI_CURRENT, val);
3844 /* get it to stable storage _now_ */
3848 void drbd_uuid_set_bm(struct drbd_conf *mdev, u64 val) __must_hold(local)
3850 if (mdev->ldev->md.uuid[UI_BITMAP] == 0 && val == 0)
3854 drbd_uuid_move_history(mdev);
3855 mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[UI_BITMAP];
3856 mdev->ldev->md.uuid[UI_BITMAP] = 0;
3857 debug_drbd_uuid(mdev, UI_HISTORY_START);
3858 debug_drbd_uuid(mdev, UI_BITMAP);
3860 if (mdev->ldev->md.uuid[UI_BITMAP])
3861 dev_warn(DEV, "bm UUID already set");
3863 mdev->ldev->md.uuid[UI_BITMAP] = val;
3864 mdev->ldev->md.uuid[UI_BITMAP] &= ~((u64)1);
3866 debug_drbd_uuid(mdev, UI_BITMAP);
3868 drbd_md_mark_dirty(mdev);
3872 * drbd_bmio_set_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
3873 * @mdev: DRBD device.
3875 * Sets all bits in the bitmap and writes the whole bitmap to stable storage.
3877 int drbd_bmio_set_n_write(struct drbd_conf *mdev)
3881 if (get_ldev_if_state(mdev, D_ATTACHING)) {
3882 drbd_md_set_flag(mdev, MDF_FULL_SYNC);
3884 drbd_bm_set_all(mdev);
3886 rv = drbd_bm_write(mdev);
3889 drbd_md_clear_flag(mdev, MDF_FULL_SYNC);
3900 * drbd_bmio_clear_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
3901 * @mdev: DRBD device.
3903 * Clears all bits in the bitmap and writes the whole bitmap to stable storage.
3905 int drbd_bmio_clear_n_write(struct drbd_conf *mdev)
3909 drbd_resume_al(mdev);
3910 if (get_ldev_if_state(mdev, D_ATTACHING)) {
3911 drbd_bm_clear_all(mdev);
3912 rv = drbd_bm_write(mdev);
3919 static int w_bitmap_io(struct drbd_conf *mdev, struct drbd_work *w, int unused)
3921 struct bm_io_work *work = container_of(w, struct bm_io_work, w);
3924 D_ASSERT(atomic_read(&mdev->ap_bio_cnt) == 0);
3926 if (get_ldev(mdev)) {
3927 drbd_bm_lock(mdev, work->why);
3928 rv = work->io_fn(mdev);
3929 drbd_bm_unlock(mdev);
3933 clear_bit(BITMAP_IO, &mdev->flags);
3934 smp_mb__after_clear_bit();
3935 wake_up(&mdev->misc_wait);
3938 work->done(mdev, rv);
3940 clear_bit(BITMAP_IO_QUEUED, &mdev->flags);
3946 void drbd_ldev_destroy(struct drbd_conf *mdev)
3948 lc_destroy(mdev->resync);
3949 mdev->resync = NULL;
3950 lc_destroy(mdev->act_log);
3951 mdev->act_log = NULL;
3953 drbd_free_bc(mdev->ldev);
3954 mdev->ldev = NULL;);
3956 if (mdev->md_io_tmpp) {
3957 __free_page(mdev->md_io_tmpp);
3958 mdev->md_io_tmpp = NULL;
3960 clear_bit(GO_DISKLESS, &mdev->flags);
3963 static int w_go_diskless(struct drbd_conf *mdev, struct drbd_work *w, int unused)
3965 D_ASSERT(mdev->state.disk == D_FAILED);
3966 /* we cannot assert local_cnt == 0 here, as get_ldev_if_state will
3967 * inc/dec it frequently. Once we are D_DISKLESS, no one will touch
3968 * the protected members anymore, though, so once put_ldev reaches zero
3969 * again, it will be safe to free them. */
3970 drbd_force_state(mdev, NS(disk, D_DISKLESS));
3974 void drbd_go_diskless(struct drbd_conf *mdev)
3976 D_ASSERT(mdev->state.disk == D_FAILED);
3977 if (!test_and_set_bit(GO_DISKLESS, &mdev->flags))
3978 drbd_queue_work(&mdev->data.work, &mdev->go_diskless);
3982 * drbd_queue_bitmap_io() - Queues an IO operation on the whole bitmap
3983 * @mdev: DRBD device.
3984 * @io_fn: IO callback to be called when bitmap IO is possible
3985 * @done: callback to be called after the bitmap IO was performed
3986 * @why: Descriptive text of the reason for doing the IO
3988 * While IO on the bitmap happens we freeze application IO thus we ensure
3989 * that drbd_set_out_of_sync() can not be called. This function MAY ONLY be
3990 * called from worker context. It MUST NOT be used while a previous such
3991 * work is still pending!
3993 void drbd_queue_bitmap_io(struct drbd_conf *mdev,
3994 int (*io_fn)(struct drbd_conf *),
3995 void (*done)(struct drbd_conf *, int),
3998 D_ASSERT(current == mdev->worker.task);
4000 D_ASSERT(!test_bit(BITMAP_IO_QUEUED, &mdev->flags));
4001 D_ASSERT(!test_bit(BITMAP_IO, &mdev->flags));
4002 D_ASSERT(list_empty(&mdev->bm_io_work.w.list));
4003 if (mdev->bm_io_work.why)
4004 dev_err(DEV, "FIXME going to queue '%s' but '%s' still pending?\n",
4005 why, mdev->bm_io_work.why);
4007 mdev->bm_io_work.io_fn = io_fn;
4008 mdev->bm_io_work.done = done;
4009 mdev->bm_io_work.why = why;
4011 spin_lock_irq(&mdev->req_lock);
4012 set_bit(BITMAP_IO, &mdev->flags);
4013 if (atomic_read(&mdev->ap_bio_cnt) == 0) {
4014 if (!test_and_set_bit(BITMAP_IO_QUEUED, &mdev->flags))
4015 drbd_queue_work(&mdev->data.work, &mdev->bm_io_work.w);
4017 spin_unlock_irq(&mdev->req_lock);
4021 * drbd_bitmap_io() - Does an IO operation on the whole bitmap
4022 * @mdev: DRBD device.
4023 * @io_fn: IO callback to be called when bitmap IO is possible
4024 * @why: Descriptive text of the reason for doing the IO
4026 * freezes application IO while that the actual IO operations runs. This
4027 * functions MAY NOT be called from worker context.
4029 int drbd_bitmap_io(struct drbd_conf *mdev, int (*io_fn)(struct drbd_conf *), char *why)
4033 D_ASSERT(current != mdev->worker.task);
4035 drbd_suspend_io(mdev);
4037 drbd_bm_lock(mdev, why);
4039 drbd_bm_unlock(mdev);
4041 drbd_resume_io(mdev);
4046 void drbd_md_set_flag(struct drbd_conf *mdev, int flag) __must_hold(local)
4048 if ((mdev->ldev->md.flags & flag) != flag) {
4049 drbd_md_mark_dirty(mdev);
4050 mdev->ldev->md.flags |= flag;
4054 void drbd_md_clear_flag(struct drbd_conf *mdev, int flag) __must_hold(local)
4056 if ((mdev->ldev->md.flags & flag) != 0) {
4057 drbd_md_mark_dirty(mdev);
4058 mdev->ldev->md.flags &= ~flag;
4061 int drbd_md_test_flag(struct drbd_backing_dev *bdev, int flag)
4063 return (bdev->md.flags & flag) != 0;
4066 static void md_sync_timer_fn(unsigned long data)
4068 struct drbd_conf *mdev = (struct drbd_conf *) data;
4070 drbd_queue_work_front(&mdev->data.work, &mdev->md_sync_work);
4073 static int w_md_sync(struct drbd_conf *mdev, struct drbd_work *w, int unused)
4075 dev_warn(DEV, "md_sync_timer expired! Worker calls drbd_md_sync().\n");
4077 dev_warn(DEV, "last md_mark_dirty: %s:%u\n",
4078 mdev->last_md_mark_dirty.func, mdev->last_md_mark_dirty.line);
4084 #ifdef CONFIG_DRBD_FAULT_INJECTION
4085 /* Fault insertion support including random number generator shamelessly
4086 * stolen from kernel/rcutorture.c */
4087 struct fault_random_state {
4088 unsigned long state;
4089 unsigned long count;
4092 #define FAULT_RANDOM_MULT 39916801 /* prime */
4093 #define FAULT_RANDOM_ADD 479001701 /* prime */
4094 #define FAULT_RANDOM_REFRESH 10000
4097 * Crude but fast random-number generator. Uses a linear congruential
4098 * generator, with occasional help from get_random_bytes().
4100 static unsigned long
4101 _drbd_fault_random(struct fault_random_state *rsp)
4105 if (!rsp->count--) {
4106 get_random_bytes(&refresh, sizeof(refresh));
4107 rsp->state += refresh;
4108 rsp->count = FAULT_RANDOM_REFRESH;
4110 rsp->state = rsp->state * FAULT_RANDOM_MULT + FAULT_RANDOM_ADD;
4111 return swahw32(rsp->state);
4115 _drbd_fault_str(unsigned int type) {
4116 static char *_faults[] = {
4117 [DRBD_FAULT_MD_WR] = "Meta-data write",
4118 [DRBD_FAULT_MD_RD] = "Meta-data read",
4119 [DRBD_FAULT_RS_WR] = "Resync write",
4120 [DRBD_FAULT_RS_RD] = "Resync read",
4121 [DRBD_FAULT_DT_WR] = "Data write",
4122 [DRBD_FAULT_DT_RD] = "Data read",
4123 [DRBD_FAULT_DT_RA] = "Data read ahead",
4124 [DRBD_FAULT_BM_ALLOC] = "BM allocation",
4125 [DRBD_FAULT_AL_EE] = "EE allocation",
4126 [DRBD_FAULT_RECEIVE] = "receive data corruption",
4129 return (type < DRBD_FAULT_MAX) ? _faults[type] : "**Unknown**";
4133 _drbd_insert_fault(struct drbd_conf *mdev, unsigned int type)
4135 static struct fault_random_state rrs = {0, 0};
4137 unsigned int ret = (
4139 ((1 << mdev_to_minor(mdev)) & fault_devs) != 0) &&
4140 (((_drbd_fault_random(&rrs) % 100) + 1) <= fault_rate));
4145 if (__ratelimit(&drbd_ratelimit_state))
4146 dev_warn(DEV, "***Simulating %s failure\n",
4147 _drbd_fault_str(type));
4154 const char *drbd_buildtag(void)
4156 /* DRBD built from external sources has here a reference to the
4157 git hash of the source code. */
4159 static char buildtag[38] = "\0uilt-in";
4161 if (buildtag[0] == 0) {
4162 #ifdef CONFIG_MODULES
4163 if (THIS_MODULE != NULL)
4164 sprintf(buildtag, "srcversion: %-24s", THIS_MODULE->srcversion);
4173 module_init(drbd_init)
4174 module_exit(drbd_cleanup)
4176 EXPORT_SYMBOL(drbd_conn_str);
4177 EXPORT_SYMBOL(drbd_role_str);
4178 EXPORT_SYMBOL(drbd_disk_str);
4179 EXPORT_SYMBOL(drbd_set_st_err_str);