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 (1-255)");
89 MODULE_ALIAS_BLOCKDEV_MAJOR(DRBD_MAJOR);
91 #include <linux/moduleparam.h>
92 /* allow_open_on_secondary */
93 MODULE_PARM_DESC(allow_oos, "DONT USE!");
94 /* thanks to these macros, if compiled into the kernel (not-module),
95 * this becomes the boot parameter drbd.minor_count */
96 module_param(minor_count, uint, 0444);
97 module_param(disable_sendpage, bool, 0644);
98 module_param(allow_oos, bool, 0);
99 module_param(cn_idx, uint, 0444);
100 module_param(proc_details, int, 0644);
102 #ifdef CONFIG_DRBD_FAULT_INJECTION
105 static int fault_count;
107 /* bitmap of enabled faults */
108 module_param(enable_faults, int, 0664);
109 /* fault rate % value - applies to all enabled faults */
110 module_param(fault_rate, int, 0664);
111 /* count of faults inserted */
112 module_param(fault_count, int, 0664);
113 /* bitmap of devices to insert faults on */
114 module_param(fault_devs, int, 0644);
117 /* module parameter, defined */
118 unsigned int minor_count = 32;
119 int disable_sendpage;
121 unsigned int cn_idx = CN_IDX_DRBD;
122 int proc_details; /* Detail level in proc drbd*/
124 /* Module parameter for setting the user mode helper program
125 * to run. Default is /sbin/drbdadm */
126 char usermode_helper[80] = "/sbin/drbdadm";
128 module_param_string(usermode_helper, usermode_helper, sizeof(usermode_helper), 0644);
130 /* in 2.6.x, our device mapping and config info contains our virtual gendisks
131 * as member "struct gendisk *vdisk;"
133 struct drbd_conf **minor_table;
135 struct kmem_cache *drbd_request_cache;
136 struct kmem_cache *drbd_ee_cache; /* epoch entries */
137 struct kmem_cache *drbd_bm_ext_cache; /* bitmap extents */
138 struct kmem_cache *drbd_al_ext_cache; /* activity log extents */
139 mempool_t *drbd_request_mempool;
140 mempool_t *drbd_ee_mempool;
142 /* I do not use a standard mempool, because:
143 1) I want to hand out the pre-allocated objects first.
144 2) I want to be able to interrupt sleeping allocation with a signal.
145 Note: This is a single linked list, the next pointer is the private
146 member of struct page.
148 struct page *drbd_pp_pool;
149 spinlock_t drbd_pp_lock;
151 wait_queue_head_t drbd_pp_wait;
153 DEFINE_RATELIMIT_STATE(drbd_ratelimit_state, 5 * HZ, 5);
155 static const struct block_device_operations drbd_ops = {
156 .owner = THIS_MODULE,
158 .release = drbd_release,
161 #define ARRY_SIZE(A) (sizeof(A)/sizeof(A[0]))
164 /* When checking with sparse, and this is an inline function, sparse will
165 give tons of false positives. When this is a real functions sparse works.
167 int _get_ldev_if_state(struct drbd_conf *mdev, enum drbd_disk_state mins)
171 atomic_inc(&mdev->local_cnt);
172 io_allowed = (mdev->state.disk >= mins);
174 if (atomic_dec_and_test(&mdev->local_cnt))
175 wake_up(&mdev->misc_wait);
183 * DOC: The transfer log
185 * The transfer log is a single linked list of &struct drbd_tl_epoch objects.
186 * mdev->newest_tle points to the head, mdev->oldest_tle points to the tail
187 * of the list. There is always at least one &struct drbd_tl_epoch object.
189 * Each &struct drbd_tl_epoch has a circular double linked list of requests
192 static int tl_init(struct drbd_conf *mdev)
194 struct drbd_tl_epoch *b;
196 /* during device minor initialization, we may well use GFP_KERNEL */
197 b = kmalloc(sizeof(struct drbd_tl_epoch), GFP_KERNEL);
200 INIT_LIST_HEAD(&b->requests);
201 INIT_LIST_HEAD(&b->w.list);
205 b->w.cb = NULL; /* if this is != NULL, we need to dec_ap_pending in tl_clear */
207 mdev->oldest_tle = b;
208 mdev->newest_tle = b;
209 INIT_LIST_HEAD(&mdev->out_of_sequence_requests);
211 mdev->tl_hash = NULL;
217 static void tl_cleanup(struct drbd_conf *mdev)
219 D_ASSERT(mdev->oldest_tle == mdev->newest_tle);
220 D_ASSERT(list_empty(&mdev->out_of_sequence_requests));
221 kfree(mdev->oldest_tle);
222 mdev->oldest_tle = NULL;
223 kfree(mdev->unused_spare_tle);
224 mdev->unused_spare_tle = NULL;
225 kfree(mdev->tl_hash);
226 mdev->tl_hash = NULL;
231 * _tl_add_barrier() - Adds a barrier to the transfer log
232 * @mdev: DRBD device.
233 * @new: Barrier to be added before the current head of the TL.
235 * The caller must hold the req_lock.
237 void _tl_add_barrier(struct drbd_conf *mdev, struct drbd_tl_epoch *new)
239 struct drbd_tl_epoch *newest_before;
241 INIT_LIST_HEAD(&new->requests);
242 INIT_LIST_HEAD(&new->w.list);
243 new->w.cb = NULL; /* if this is != NULL, we need to dec_ap_pending in tl_clear */
247 newest_before = mdev->newest_tle;
248 /* never send a barrier number == 0, because that is special-cased
249 * when using TCQ for our write ordering code */
250 new->br_number = (newest_before->br_number+1) ?: 1;
251 if (mdev->newest_tle != new) {
252 mdev->newest_tle->next = new;
253 mdev->newest_tle = new;
258 * tl_release() - Free or recycle the oldest &struct drbd_tl_epoch object of the TL
259 * @mdev: DRBD device.
260 * @barrier_nr: Expected identifier of the DRBD write barrier packet.
261 * @set_size: Expected number of requests before that barrier.
263 * In case the passed barrier_nr or set_size does not match the oldest
264 * &struct drbd_tl_epoch objects this function will cause a termination
267 void tl_release(struct drbd_conf *mdev, unsigned int barrier_nr,
268 unsigned int set_size)
270 struct drbd_tl_epoch *b, *nob; /* next old barrier */
271 struct list_head *le, *tle;
272 struct drbd_request *r;
274 spin_lock_irq(&mdev->req_lock);
276 b = mdev->oldest_tle;
278 /* first some paranoia code */
280 dev_err(DEV, "BAD! BarrierAck #%u received, but no epoch in tl!?\n",
284 if (b->br_number != barrier_nr) {
285 dev_err(DEV, "BAD! BarrierAck #%u received, expected #%u!\n",
286 barrier_nr, b->br_number);
289 if (b->n_writes != set_size) {
290 dev_err(DEV, "BAD! BarrierAck #%u received with n_writes=%u, expected n_writes=%u!\n",
291 barrier_nr, set_size, b->n_writes);
295 /* Clean up list of requests processed during current epoch */
296 list_for_each_safe(le, tle, &b->requests) {
297 r = list_entry(le, struct drbd_request, tl_requests);
298 _req_mod(r, barrier_acked);
300 /* There could be requests on the list waiting for completion
301 of the write to the local disk. To avoid corruptions of
302 slab's data structures we have to remove the lists head.
304 Also there could have been a barrier ack out of sequence, overtaking
305 the write acks - which would be a bug and violating write ordering.
306 To not deadlock in case we lose connection while such requests are
307 still pending, we need some way to find them for the
308 _req_mode(connection_lost_while_pending).
310 These have been list_move'd to the out_of_sequence_requests list in
311 _req_mod(, barrier_acked) above.
313 list_del_init(&b->requests);
316 if (test_and_clear_bit(CREATE_BARRIER, &mdev->flags)) {
317 _tl_add_barrier(mdev, b);
319 mdev->oldest_tle = nob;
320 /* if nob == NULL b was the only barrier, and becomes the new
321 barrier. Therefore mdev->oldest_tle points already to b */
323 D_ASSERT(nob != NULL);
324 mdev->oldest_tle = nob;
328 spin_unlock_irq(&mdev->req_lock);
329 dec_ap_pending(mdev);
334 spin_unlock_irq(&mdev->req_lock);
335 drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR));
339 * _tl_restart() - Walks the transfer log, and applies an action to all requests
340 * @mdev: DRBD device.
341 * @what: The action/event to perform with all request objects
343 * @what might be one of connection_lost_while_pending, resend, fail_frozen_disk_io,
344 * restart_frozen_disk_io.
346 static void _tl_restart(struct drbd_conf *mdev, enum drbd_req_event what)
348 struct drbd_tl_epoch *b, *tmp, **pn;
349 struct list_head *le, *tle, carry_reads;
350 struct drbd_request *req;
351 int rv, n_writes, n_reads;
353 b = mdev->oldest_tle;
354 pn = &mdev->oldest_tle;
358 INIT_LIST_HEAD(&carry_reads);
359 list_for_each_safe(le, tle, &b->requests) {
360 req = list_entry(le, struct drbd_request, tl_requests);
361 rv = _req_mod(req, what);
363 n_writes += (rv & MR_WRITE) >> MR_WRITE_SHIFT;
364 n_reads += (rv & MR_READ) >> MR_READ_SHIFT;
369 if (what == resend) {
370 b->n_writes = n_writes;
371 if (b->w.cb == NULL) {
372 b->w.cb = w_send_barrier;
373 inc_ap_pending(mdev);
374 set_bit(CREATE_BARRIER, &mdev->flags);
377 drbd_queue_work(&mdev->data.work, &b->w);
382 list_add(&carry_reads, &b->requests);
383 /* there could still be requests on that ring list,
384 * in case local io is still pending */
385 list_del(&b->requests);
387 /* dec_ap_pending corresponding to queue_barrier.
388 * the newest barrier may not have been queued yet,
389 * in which case w.cb is still NULL. */
391 dec_ap_pending(mdev);
393 if (b == mdev->newest_tle) {
394 /* recycle, but reinit! */
395 D_ASSERT(tmp == NULL);
396 INIT_LIST_HEAD(&b->requests);
397 list_splice(&carry_reads, &b->requests);
398 INIT_LIST_HEAD(&b->w.list);
400 b->br_number = net_random();
410 list_splice(&carry_reads, &b->requests);
416 * tl_clear() - Clears all requests and &struct drbd_tl_epoch objects out of the TL
417 * @mdev: DRBD device.
419 * This is called after the connection to the peer was lost. The storage covered
420 * by the requests on the transfer gets marked as our of sync. Called from the
421 * receiver thread and the worker thread.
423 void tl_clear(struct drbd_conf *mdev)
425 struct list_head *le, *tle;
426 struct drbd_request *r;
428 spin_lock_irq(&mdev->req_lock);
430 _tl_restart(mdev, connection_lost_while_pending);
432 /* we expect this list to be empty. */
433 D_ASSERT(list_empty(&mdev->out_of_sequence_requests));
435 /* but just in case, clean it up anyways! */
436 list_for_each_safe(le, tle, &mdev->out_of_sequence_requests) {
437 r = list_entry(le, struct drbd_request, tl_requests);
438 /* It would be nice to complete outside of spinlock.
439 * But this is easier for now. */
440 _req_mod(r, connection_lost_while_pending);
443 /* ensure bit indicating barrier is required is clear */
444 clear_bit(CREATE_BARRIER, &mdev->flags);
446 memset(mdev->app_reads_hash, 0, APP_R_HSIZE*sizeof(void *));
448 spin_unlock_irq(&mdev->req_lock);
451 void tl_restart(struct drbd_conf *mdev, enum drbd_req_event what)
453 spin_lock_irq(&mdev->req_lock);
454 _tl_restart(mdev, what);
455 spin_unlock_irq(&mdev->req_lock);
459 * cl_wide_st_chg() - true if the state change is a cluster wide one
460 * @mdev: DRBD device.
461 * @os: old (current) state.
462 * @ns: new (wanted) state.
464 static int cl_wide_st_chg(struct drbd_conf *mdev,
465 union drbd_state os, union drbd_state ns)
467 return (os.conn >= C_CONNECTED && ns.conn >= C_CONNECTED &&
468 ((os.role != R_PRIMARY && ns.role == R_PRIMARY) ||
469 (os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) ||
470 (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S) ||
471 (os.disk != D_DISKLESS && ns.disk == D_DISKLESS))) ||
472 (os.conn >= C_CONNECTED && ns.conn == C_DISCONNECTING) ||
473 (os.conn == C_CONNECTED && ns.conn == C_VERIFY_S);
477 drbd_change_state(struct drbd_conf *mdev, enum chg_state_flags f,
478 union drbd_state mask, union drbd_state val)
481 union drbd_state os, ns;
482 enum drbd_state_rv rv;
484 spin_lock_irqsave(&mdev->req_lock, flags);
486 ns.i = (os.i & ~mask.i) | val.i;
487 rv = _drbd_set_state(mdev, ns, f, NULL);
489 spin_unlock_irqrestore(&mdev->req_lock, flags);
495 * drbd_force_state() - Impose a change which happens outside our control on our state
496 * @mdev: DRBD device.
497 * @mask: mask of state bits to change.
498 * @val: value of new state bits.
500 void drbd_force_state(struct drbd_conf *mdev,
501 union drbd_state mask, union drbd_state val)
503 drbd_change_state(mdev, CS_HARD, mask, val);
506 static enum drbd_state_rv is_valid_state(struct drbd_conf *, union drbd_state);
507 static enum drbd_state_rv is_valid_state_transition(struct drbd_conf *,
510 static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state os,
511 union drbd_state ns, const char **warn_sync_abort);
512 int drbd_send_state_req(struct drbd_conf *,
513 union drbd_state, union drbd_state);
515 static enum drbd_state_rv
516 _req_st_cond(struct drbd_conf *mdev, union drbd_state mask,
517 union drbd_state val)
519 union drbd_state os, ns;
521 enum drbd_state_rv rv;
523 if (test_and_clear_bit(CL_ST_CHG_SUCCESS, &mdev->flags))
524 return SS_CW_SUCCESS;
526 if (test_and_clear_bit(CL_ST_CHG_FAIL, &mdev->flags))
527 return SS_CW_FAILED_BY_PEER;
530 spin_lock_irqsave(&mdev->req_lock, flags);
532 ns.i = (os.i & ~mask.i) | val.i;
533 ns = sanitize_state(mdev, os, ns, NULL);
535 if (!cl_wide_st_chg(mdev, os, ns))
538 rv = is_valid_state(mdev, ns);
539 if (rv == SS_SUCCESS) {
540 rv = is_valid_state_transition(mdev, ns, os);
541 if (rv == SS_SUCCESS)
542 rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */
545 spin_unlock_irqrestore(&mdev->req_lock, flags);
551 * drbd_req_state() - Perform an eventually cluster wide state change
552 * @mdev: DRBD device.
553 * @mask: mask of state bits to change.
554 * @val: value of new state bits.
557 * Should not be called directly, use drbd_request_state() or
558 * _drbd_request_state().
560 static enum drbd_state_rv
561 drbd_req_state(struct drbd_conf *mdev, union drbd_state mask,
562 union drbd_state val, enum chg_state_flags f)
564 struct completion done;
566 union drbd_state os, ns;
567 enum drbd_state_rv rv;
569 init_completion(&done);
571 if (f & CS_SERIALIZE)
572 mutex_lock(&mdev->state_mutex);
574 spin_lock_irqsave(&mdev->req_lock, flags);
576 ns.i = (os.i & ~mask.i) | val.i;
577 ns = sanitize_state(mdev, os, ns, NULL);
579 if (cl_wide_st_chg(mdev, os, ns)) {
580 rv = is_valid_state(mdev, ns);
581 if (rv == SS_SUCCESS)
582 rv = is_valid_state_transition(mdev, ns, os);
583 spin_unlock_irqrestore(&mdev->req_lock, flags);
585 if (rv < SS_SUCCESS) {
587 print_st_err(mdev, os, ns, rv);
591 drbd_state_lock(mdev);
592 if (!drbd_send_state_req(mdev, mask, val)) {
593 drbd_state_unlock(mdev);
594 rv = SS_CW_FAILED_BY_PEER;
596 print_st_err(mdev, os, ns, rv);
600 wait_event(mdev->state_wait,
601 (rv = _req_st_cond(mdev, mask, val)));
603 if (rv < SS_SUCCESS) {
604 drbd_state_unlock(mdev);
606 print_st_err(mdev, os, ns, rv);
609 spin_lock_irqsave(&mdev->req_lock, flags);
611 ns.i = (os.i & ~mask.i) | val.i;
612 rv = _drbd_set_state(mdev, ns, f, &done);
613 drbd_state_unlock(mdev);
615 rv = _drbd_set_state(mdev, ns, f, &done);
618 spin_unlock_irqrestore(&mdev->req_lock, flags);
620 if (f & CS_WAIT_COMPLETE && rv == SS_SUCCESS) {
621 D_ASSERT(current != mdev->worker.task);
622 wait_for_completion(&done);
626 if (f & CS_SERIALIZE)
627 mutex_unlock(&mdev->state_mutex);
633 * _drbd_request_state() - Request a state change (with flags)
634 * @mdev: DRBD device.
635 * @mask: mask of state bits to change.
636 * @val: value of new state bits.
639 * Cousin of drbd_request_state(), useful with the CS_WAIT_COMPLETE
640 * flag, or when logging of failed state change requests is not desired.
643 _drbd_request_state(struct drbd_conf *mdev, union drbd_state mask,
644 union drbd_state val, enum chg_state_flags f)
646 enum drbd_state_rv rv;
648 wait_event(mdev->state_wait,
649 (rv = drbd_req_state(mdev, mask, val, f)) != SS_IN_TRANSIENT_STATE);
654 static void print_st(struct drbd_conf *mdev, char *name, union drbd_state ns)
656 dev_err(DEV, " %s = { cs:%s ro:%s/%s ds:%s/%s %c%c%c%c }\n",
658 drbd_conn_str(ns.conn),
659 drbd_role_str(ns.role),
660 drbd_role_str(ns.peer),
661 drbd_disk_str(ns.disk),
662 drbd_disk_str(ns.pdsk),
663 is_susp(ns) ? 's' : 'r',
664 ns.aftr_isp ? 'a' : '-',
665 ns.peer_isp ? 'p' : '-',
666 ns.user_isp ? 'u' : '-'
670 void print_st_err(struct drbd_conf *mdev, union drbd_state os,
671 union drbd_state ns, enum drbd_state_rv err)
673 if (err == SS_IN_TRANSIENT_STATE)
675 dev_err(DEV, "State change failed: %s\n", drbd_set_st_err_str(err));
676 print_st(mdev, " state", os);
677 print_st(mdev, "wanted", ns);
682 * is_valid_state() - Returns an SS_ error code if ns is not valid
683 * @mdev: DRBD device.
684 * @ns: State to consider.
686 static enum drbd_state_rv
687 is_valid_state(struct drbd_conf *mdev, union drbd_state ns)
689 /* See drbd_state_sw_errors in drbd_strings.c */
691 enum drbd_fencing_p fp;
692 enum drbd_state_rv rv = SS_SUCCESS;
695 if (get_ldev(mdev)) {
696 fp = mdev->ldev->dc.fencing;
700 if (get_net_conf(mdev)) {
701 if (!mdev->net_conf->two_primaries &&
702 ns.role == R_PRIMARY && ns.peer == R_PRIMARY)
703 rv = SS_TWO_PRIMARIES;
708 /* already found a reason to abort */;
709 else if (ns.role == R_SECONDARY && mdev->open_cnt)
710 rv = SS_DEVICE_IN_USE;
712 else if (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.disk < D_UP_TO_DATE)
713 rv = SS_NO_UP_TO_DATE_DISK;
715 else if (fp >= FP_RESOURCE &&
716 ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk >= D_UNKNOWN)
719 else if (ns.role == R_PRIMARY && ns.disk <= D_INCONSISTENT && ns.pdsk <= D_INCONSISTENT)
720 rv = SS_NO_UP_TO_DATE_DISK;
722 else if (ns.conn > C_CONNECTED && ns.disk < D_INCONSISTENT)
723 rv = SS_NO_LOCAL_DISK;
725 else if (ns.conn > C_CONNECTED && ns.pdsk < D_INCONSISTENT)
726 rv = SS_NO_REMOTE_DISK;
728 else if (ns.conn > C_CONNECTED && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE)
729 rv = SS_NO_UP_TO_DATE_DISK;
731 else if ((ns.conn == C_CONNECTED ||
732 ns.conn == C_WF_BITMAP_S ||
733 ns.conn == C_SYNC_SOURCE ||
734 ns.conn == C_PAUSED_SYNC_S) &&
735 ns.disk == D_OUTDATED)
736 rv = SS_CONNECTED_OUTDATES;
738 else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
739 (mdev->sync_conf.verify_alg[0] == 0))
740 rv = SS_NO_VERIFY_ALG;
742 else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
743 mdev->agreed_pro_version < 88)
744 rv = SS_NOT_SUPPORTED;
750 * is_valid_state_transition() - Returns an SS_ error code if the state transition is not possible
751 * @mdev: DRBD device.
755 static enum drbd_state_rv
756 is_valid_state_transition(struct drbd_conf *mdev, union drbd_state ns,
759 enum drbd_state_rv rv = SS_SUCCESS;
761 if ((ns.conn == C_STARTING_SYNC_T || ns.conn == C_STARTING_SYNC_S) &&
762 os.conn > C_CONNECTED)
763 rv = SS_RESYNC_RUNNING;
765 if (ns.conn == C_DISCONNECTING && os.conn == C_STANDALONE)
766 rv = SS_ALREADY_STANDALONE;
768 if (ns.disk > D_ATTACHING && os.disk == D_DISKLESS)
771 if (ns.conn == C_WF_CONNECTION && os.conn < C_UNCONNECTED)
772 rv = SS_NO_NET_CONFIG;
774 if (ns.disk == D_OUTDATED && os.disk < D_OUTDATED && os.disk != D_ATTACHING)
775 rv = SS_LOWER_THAN_OUTDATED;
777 if (ns.conn == C_DISCONNECTING && os.conn == C_UNCONNECTED)
778 rv = SS_IN_TRANSIENT_STATE;
780 if (ns.conn == os.conn && ns.conn == C_WF_REPORT_PARAMS)
781 rv = SS_IN_TRANSIENT_STATE;
783 if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && os.conn < C_CONNECTED)
784 rv = SS_NEED_CONNECTION;
786 if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
787 ns.conn != os.conn && os.conn > C_CONNECTED)
788 rv = SS_RESYNC_RUNNING;
790 if ((ns.conn == C_STARTING_SYNC_S || ns.conn == C_STARTING_SYNC_T) &&
791 os.conn < C_CONNECTED)
792 rv = SS_NEED_CONNECTION;
794 if ((ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)
795 && os.conn < C_WF_REPORT_PARAMS)
796 rv = SS_NEED_CONNECTION; /* No NetworkFailure -> SyncTarget etc... */
802 * sanitize_state() - Resolves implicitly necessary additional changes to a state transition
803 * @mdev: DRBD device.
808 * When we loose connection, we have to set the state of the peers disk (pdsk)
809 * to D_UNKNOWN. This rule and many more along those lines are in this function.
811 static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state os,
812 union drbd_state ns, const char **warn_sync_abort)
814 enum drbd_fencing_p fp;
815 enum drbd_disk_state disk_min, disk_max, pdsk_min, pdsk_max;
818 if (get_ldev(mdev)) {
819 fp = mdev->ldev->dc.fencing;
823 /* Disallow Network errors to configure a device's network part */
824 if ((ns.conn >= C_TIMEOUT && ns.conn <= C_TEAR_DOWN) &&
825 os.conn <= C_DISCONNECTING)
828 /* After a network error (+C_TEAR_DOWN) only C_UNCONNECTED or C_DISCONNECTING can follow.
829 * If you try to go into some Sync* state, that shall fail (elsewhere). */
830 if (os.conn >= C_TIMEOUT && os.conn <= C_TEAR_DOWN &&
831 ns.conn != C_UNCONNECTED && ns.conn != C_DISCONNECTING && ns.conn <= C_TEAR_DOWN)
834 /* we cannot fail (again) if we already detached */
835 if (ns.disk == D_FAILED && os.disk == D_DISKLESS)
836 ns.disk = D_DISKLESS;
838 /* if we are only D_ATTACHING yet,
839 * we can (and should) go directly to D_DISKLESS. */
840 if (ns.disk == D_FAILED && os.disk == D_ATTACHING)
841 ns.disk = D_DISKLESS;
843 /* After C_DISCONNECTING only C_STANDALONE may follow */
844 if (os.conn == C_DISCONNECTING && ns.conn != C_STANDALONE)
847 if (ns.conn < C_CONNECTED) {
850 if (ns.pdsk > D_UNKNOWN || ns.pdsk < D_INCONSISTENT)
854 /* Clear the aftr_isp when becoming unconfigured */
855 if (ns.conn == C_STANDALONE && ns.disk == D_DISKLESS && ns.role == R_SECONDARY)
858 /* Abort resync if a disk fails/detaches */
859 if (os.conn > C_CONNECTED && ns.conn > C_CONNECTED &&
860 (ns.disk <= D_FAILED || ns.pdsk <= D_FAILED)) {
863 os.conn == C_VERIFY_S || os.conn == C_VERIFY_T ?
864 "Online-verify" : "Resync";
865 ns.conn = C_CONNECTED;
868 /* Connection breaks down before we finished "Negotiating" */
869 if (ns.conn < C_CONNECTED && ns.disk == D_NEGOTIATING &&
870 get_ldev_if_state(mdev, D_NEGOTIATING)) {
871 if (mdev->ed_uuid == mdev->ldev->md.uuid[UI_CURRENT]) {
872 ns.disk = mdev->new_state_tmp.disk;
873 ns.pdsk = mdev->new_state_tmp.pdsk;
875 dev_alert(DEV, "Connection lost while negotiating, no data!\n");
876 ns.disk = D_DISKLESS;
882 /* D_CONSISTENT and D_OUTDATED vanish when we get connected */
883 if (ns.conn >= C_CONNECTED && ns.conn < C_AHEAD) {
884 if (ns.disk == D_CONSISTENT || ns.disk == D_OUTDATED)
885 ns.disk = D_UP_TO_DATE;
886 if (ns.pdsk == D_CONSISTENT || ns.pdsk == D_OUTDATED)
887 ns.pdsk = D_UP_TO_DATE;
890 /* Implications of the connection stat on the disk states */
891 disk_min = D_DISKLESS;
892 disk_max = D_UP_TO_DATE;
893 pdsk_min = D_INCONSISTENT;
894 pdsk_max = D_UNKNOWN;
895 switch ((enum drbd_conns)ns.conn) {
897 case C_PAUSED_SYNC_T:
898 case C_STARTING_SYNC_T:
901 disk_min = D_INCONSISTENT;
902 disk_max = D_OUTDATED;
903 pdsk_min = D_UP_TO_DATE;
904 pdsk_max = D_UP_TO_DATE;
908 disk_min = D_UP_TO_DATE;
909 disk_max = D_UP_TO_DATE;
910 pdsk_min = D_UP_TO_DATE;
911 pdsk_max = D_UP_TO_DATE;
914 disk_min = D_DISKLESS;
915 disk_max = D_UP_TO_DATE;
916 pdsk_min = D_DISKLESS;
917 pdsk_max = D_UP_TO_DATE;
920 case C_PAUSED_SYNC_S:
921 case C_STARTING_SYNC_S:
923 disk_min = D_UP_TO_DATE;
924 disk_max = D_UP_TO_DATE;
925 pdsk_min = D_INCONSISTENT;
926 pdsk_max = D_CONSISTENT; /* D_OUTDATED would be nice. But explicit outdate necessary*/
929 disk_min = D_INCONSISTENT;
930 disk_max = D_INCONSISTENT;
931 pdsk_min = D_UP_TO_DATE;
932 pdsk_max = D_UP_TO_DATE;
935 disk_min = D_UP_TO_DATE;
936 disk_max = D_UP_TO_DATE;
937 pdsk_min = D_INCONSISTENT;
938 pdsk_max = D_INCONSISTENT;
941 case C_DISCONNECTING:
945 case C_NETWORK_FAILURE:
946 case C_PROTOCOL_ERROR:
948 case C_WF_CONNECTION:
949 case C_WF_REPORT_PARAMS:
953 if (ns.disk > disk_max)
956 if (ns.disk < disk_min) {
957 dev_warn(DEV, "Implicitly set disk from %s to %s\n",
958 drbd_disk_str(ns.disk), drbd_disk_str(disk_min));
961 if (ns.pdsk > pdsk_max)
964 if (ns.pdsk < pdsk_min) {
965 dev_warn(DEV, "Implicitly set pdsk from %s to %s\n",
966 drbd_disk_str(ns.pdsk), drbd_disk_str(pdsk_min));
970 if (fp == FP_STONITH &&
971 (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk > D_OUTDATED) &&
972 !(os.role == R_PRIMARY && os.conn < C_CONNECTED && os.pdsk > D_OUTDATED))
973 ns.susp_fen = 1; /* Suspend IO while fence-peer handler runs (peer lost) */
975 if (mdev->sync_conf.on_no_data == OND_SUSPEND_IO &&
976 (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE) &&
977 !(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE))
978 ns.susp_nod = 1; /* Suspend IO while no data available (no accessible data available) */
980 if (ns.aftr_isp || ns.peer_isp || ns.user_isp) {
981 if (ns.conn == C_SYNC_SOURCE)
982 ns.conn = C_PAUSED_SYNC_S;
983 if (ns.conn == C_SYNC_TARGET)
984 ns.conn = C_PAUSED_SYNC_T;
986 if (ns.conn == C_PAUSED_SYNC_S)
987 ns.conn = C_SYNC_SOURCE;
988 if (ns.conn == C_PAUSED_SYNC_T)
989 ns.conn = C_SYNC_TARGET;
995 /* helper for __drbd_set_state */
996 static void set_ov_position(struct drbd_conf *mdev, enum drbd_conns cs)
998 if (mdev->agreed_pro_version < 90)
999 mdev->ov_start_sector = 0;
1000 mdev->rs_total = drbd_bm_bits(mdev);
1001 mdev->ov_position = 0;
1002 if (cs == C_VERIFY_T) {
1003 /* starting online verify from an arbitrary position
1004 * does not fit well into the existing protocol.
1005 * on C_VERIFY_T, we initialize ov_left and friends
1006 * implicitly in receive_DataRequest once the
1007 * first P_OV_REQUEST is received */
1008 mdev->ov_start_sector = ~(sector_t)0;
1010 unsigned long bit = BM_SECT_TO_BIT(mdev->ov_start_sector);
1011 if (bit >= mdev->rs_total) {
1012 mdev->ov_start_sector =
1013 BM_BIT_TO_SECT(mdev->rs_total - 1);
1016 mdev->rs_total -= bit;
1017 mdev->ov_position = mdev->ov_start_sector;
1019 mdev->ov_left = mdev->rs_total;
1022 static void drbd_resume_al(struct drbd_conf *mdev)
1024 if (test_and_clear_bit(AL_SUSPENDED, &mdev->flags))
1025 dev_info(DEV, "Resumed AL updates\n");
1029 * __drbd_set_state() - Set a new DRBD state
1030 * @mdev: DRBD device.
1033 * @done: Optional completion, that will get completed after the after_state_ch() finished
1035 * Caller needs to hold req_lock, and global_state_lock. Do not call directly.
1038 __drbd_set_state(struct drbd_conf *mdev, union drbd_state ns,
1039 enum chg_state_flags flags, struct completion *done)
1041 union drbd_state os;
1042 enum drbd_state_rv rv = SS_SUCCESS;
1043 const char *warn_sync_abort = NULL;
1044 struct after_state_chg_work *ascw;
1048 ns = sanitize_state(mdev, os, ns, &warn_sync_abort);
1051 return SS_NOTHING_TO_DO;
1053 if (!(flags & CS_HARD)) {
1054 /* pre-state-change checks ; only look at ns */
1055 /* See drbd_state_sw_errors in drbd_strings.c */
1057 rv = is_valid_state(mdev, ns);
1058 if (rv < SS_SUCCESS) {
1059 /* If the old state was illegal as well, then let
1062 if (is_valid_state(mdev, os) == rv)
1063 rv = is_valid_state_transition(mdev, ns, os);
1065 rv = is_valid_state_transition(mdev, ns, os);
1068 if (rv < SS_SUCCESS) {
1069 if (flags & CS_VERBOSE)
1070 print_st_err(mdev, os, ns, rv);
1074 if (warn_sync_abort)
1075 dev_warn(DEV, "%s aborted.\n", warn_sync_abort);
1081 if (ns.role != os.role)
1082 pbp += sprintf(pbp, "role( %s -> %s ) ",
1083 drbd_role_str(os.role),
1084 drbd_role_str(ns.role));
1085 if (ns.peer != os.peer)
1086 pbp += sprintf(pbp, "peer( %s -> %s ) ",
1087 drbd_role_str(os.peer),
1088 drbd_role_str(ns.peer));
1089 if (ns.conn != os.conn)
1090 pbp += sprintf(pbp, "conn( %s -> %s ) ",
1091 drbd_conn_str(os.conn),
1092 drbd_conn_str(ns.conn));
1093 if (ns.disk != os.disk)
1094 pbp += sprintf(pbp, "disk( %s -> %s ) ",
1095 drbd_disk_str(os.disk),
1096 drbd_disk_str(ns.disk));
1097 if (ns.pdsk != os.pdsk)
1098 pbp += sprintf(pbp, "pdsk( %s -> %s ) ",
1099 drbd_disk_str(os.pdsk),
1100 drbd_disk_str(ns.pdsk));
1101 if (is_susp(ns) != is_susp(os))
1102 pbp += sprintf(pbp, "susp( %d -> %d ) ",
1105 if (ns.aftr_isp != os.aftr_isp)
1106 pbp += sprintf(pbp, "aftr_isp( %d -> %d ) ",
1109 if (ns.peer_isp != os.peer_isp)
1110 pbp += sprintf(pbp, "peer_isp( %d -> %d ) ",
1113 if (ns.user_isp != os.user_isp)
1114 pbp += sprintf(pbp, "user_isp( %d -> %d ) ",
1117 dev_info(DEV, "%s\n", pb);
1120 /* solve the race between becoming unconfigured,
1121 * worker doing the cleanup, and
1122 * admin reconfiguring us:
1123 * on (re)configure, first set CONFIG_PENDING,
1124 * then wait for a potentially exiting worker,
1125 * start the worker, and schedule one no_op.
1126 * then proceed with configuration.
1128 if (ns.disk == D_DISKLESS &&
1129 ns.conn == C_STANDALONE &&
1130 ns.role == R_SECONDARY &&
1131 !test_and_set_bit(CONFIG_PENDING, &mdev->flags))
1132 set_bit(DEVICE_DYING, &mdev->flags);
1134 /* if we are going -> D_FAILED or D_DISKLESS, grab one extra reference
1135 * on the ldev here, to be sure the transition -> D_DISKLESS resp.
1136 * drbd_ldev_destroy() won't happen before our corresponding
1137 * after_state_ch works run, where we put_ldev again. */
1138 if ((os.disk != D_FAILED && ns.disk == D_FAILED) ||
1139 (os.disk != D_DISKLESS && ns.disk == D_DISKLESS))
1140 atomic_inc(&mdev->local_cnt);
1143 wake_up(&mdev->misc_wait);
1144 wake_up(&mdev->state_wait);
1146 /* aborted verify run. log the last position */
1147 if ((os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) &&
1148 ns.conn < C_CONNECTED) {
1149 mdev->ov_start_sector =
1150 BM_BIT_TO_SECT(drbd_bm_bits(mdev) - mdev->ov_left);
1151 dev_info(DEV, "Online Verify reached sector %llu\n",
1152 (unsigned long long)mdev->ov_start_sector);
1155 if ((os.conn == C_PAUSED_SYNC_T || os.conn == C_PAUSED_SYNC_S) &&
1156 (ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)) {
1157 dev_info(DEV, "Syncer continues.\n");
1158 mdev->rs_paused += (long)jiffies
1159 -(long)mdev->rs_mark_time[mdev->rs_last_mark];
1160 if (ns.conn == C_SYNC_TARGET)
1161 mod_timer(&mdev->resync_timer, jiffies);
1164 if ((os.conn == C_SYNC_TARGET || os.conn == C_SYNC_SOURCE) &&
1165 (ns.conn == C_PAUSED_SYNC_T || ns.conn == C_PAUSED_SYNC_S)) {
1166 dev_info(DEV, "Resync suspended\n");
1167 mdev->rs_mark_time[mdev->rs_last_mark] = jiffies;
1170 if (os.conn == C_CONNECTED &&
1171 (ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T)) {
1172 unsigned long now = jiffies;
1175 set_ov_position(mdev, ns.conn);
1176 mdev->rs_start = now;
1177 mdev->rs_last_events = 0;
1178 mdev->rs_last_sect_ev = 0;
1179 mdev->ov_last_oos_size = 0;
1180 mdev->ov_last_oos_start = 0;
1182 for (i = 0; i < DRBD_SYNC_MARKS; i++) {
1183 mdev->rs_mark_left[i] = mdev->ov_left;
1184 mdev->rs_mark_time[i] = now;
1187 drbd_rs_controller_reset(mdev);
1189 if (ns.conn == C_VERIFY_S) {
1190 dev_info(DEV, "Starting Online Verify from sector %llu\n",
1191 (unsigned long long)mdev->ov_position);
1192 mod_timer(&mdev->resync_timer, jiffies);
1196 if (get_ldev(mdev)) {
1197 u32 mdf = mdev->ldev->md.flags & ~(MDF_CONSISTENT|MDF_PRIMARY_IND|
1198 MDF_CONNECTED_IND|MDF_WAS_UP_TO_DATE|
1199 MDF_PEER_OUT_DATED|MDF_CRASHED_PRIMARY);
1201 if (test_bit(CRASHED_PRIMARY, &mdev->flags))
1202 mdf |= MDF_CRASHED_PRIMARY;
1203 if (mdev->state.role == R_PRIMARY ||
1204 (mdev->state.pdsk < D_INCONSISTENT && mdev->state.peer == R_PRIMARY))
1205 mdf |= MDF_PRIMARY_IND;
1206 if (mdev->state.conn > C_WF_REPORT_PARAMS)
1207 mdf |= MDF_CONNECTED_IND;
1208 if (mdev->state.disk > D_INCONSISTENT)
1209 mdf |= MDF_CONSISTENT;
1210 if (mdev->state.disk > D_OUTDATED)
1211 mdf |= MDF_WAS_UP_TO_DATE;
1212 if (mdev->state.pdsk <= D_OUTDATED && mdev->state.pdsk >= D_INCONSISTENT)
1213 mdf |= MDF_PEER_OUT_DATED;
1214 if (mdf != mdev->ldev->md.flags) {
1215 mdev->ldev->md.flags = mdf;
1216 drbd_md_mark_dirty(mdev);
1218 if (os.disk < D_CONSISTENT && ns.disk >= D_CONSISTENT)
1219 drbd_set_ed_uuid(mdev, mdev->ldev->md.uuid[UI_CURRENT]);
1223 /* Peer was forced D_UP_TO_DATE & R_PRIMARY, consider to resync */
1224 if (os.disk == D_INCONSISTENT && os.pdsk == D_INCONSISTENT &&
1225 os.peer == R_SECONDARY && ns.peer == R_PRIMARY)
1226 set_bit(CONSIDER_RESYNC, &mdev->flags);
1228 /* Receiver should clean up itself */
1229 if (os.conn != C_DISCONNECTING && ns.conn == C_DISCONNECTING)
1230 drbd_thread_stop_nowait(&mdev->receiver);
1232 /* Now the receiver finished cleaning up itself, it should die */
1233 if (os.conn != C_STANDALONE && ns.conn == C_STANDALONE)
1234 drbd_thread_stop_nowait(&mdev->receiver);
1236 /* Upon network failure, we need to restart the receiver. */
1237 if (os.conn > C_TEAR_DOWN &&
1238 ns.conn <= C_TEAR_DOWN && ns.conn >= C_TIMEOUT)
1239 drbd_thread_restart_nowait(&mdev->receiver);
1241 /* Resume AL writing if we get a connection */
1242 if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED)
1243 drbd_resume_al(mdev);
1245 ascw = kmalloc(sizeof(*ascw), GFP_ATOMIC);
1249 ascw->flags = flags;
1250 ascw->w.cb = w_after_state_ch;
1252 drbd_queue_work(&mdev->data.work, &ascw->w);
1254 dev_warn(DEV, "Could not kmalloc an ascw\n");
1260 static int w_after_state_ch(struct drbd_conf *mdev, struct drbd_work *w, int unused)
1262 struct after_state_chg_work *ascw =
1263 container_of(w, struct after_state_chg_work, w);
1264 after_state_ch(mdev, ascw->os, ascw->ns, ascw->flags);
1265 if (ascw->flags & CS_WAIT_COMPLETE) {
1266 D_ASSERT(ascw->done != NULL);
1267 complete(ascw->done);
1274 static void abw_start_sync(struct drbd_conf *mdev, int rv)
1277 dev_err(DEV, "Writing the bitmap failed not starting resync.\n");
1278 _drbd_request_state(mdev, NS(conn, C_CONNECTED), CS_VERBOSE);
1282 switch (mdev->state.conn) {
1283 case C_STARTING_SYNC_T:
1284 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE);
1286 case C_STARTING_SYNC_S:
1287 drbd_start_resync(mdev, C_SYNC_SOURCE);
1292 int drbd_bitmap_io_from_worker(struct drbd_conf *mdev, int (*io_fn)(struct drbd_conf *), char *why)
1296 D_ASSERT(current == mdev->worker.task);
1298 /* open coded non-blocking drbd_suspend_io(mdev); */
1299 set_bit(SUSPEND_IO, &mdev->flags);
1300 if (!is_susp(mdev->state))
1301 D_ASSERT(atomic_read(&mdev->ap_bio_cnt) == 0);
1303 drbd_bm_lock(mdev, why);
1305 drbd_bm_unlock(mdev);
1307 drbd_resume_io(mdev);
1313 * after_state_ch() - Perform after state change actions that may sleep
1314 * @mdev: DRBD device.
1319 static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
1320 union drbd_state ns, enum chg_state_flags flags)
1322 enum drbd_fencing_p fp;
1323 enum drbd_req_event what = nothing;
1324 union drbd_state nsm = (union drbd_state){ .i = -1 };
1326 if (os.conn != C_CONNECTED && ns.conn == C_CONNECTED) {
1327 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1329 mdev->p_uuid[UI_FLAGS] &= ~((u64)2);
1333 if (get_ldev(mdev)) {
1334 fp = mdev->ldev->dc.fencing;
1338 /* Inform userspace about the change... */
1339 drbd_bcast_state(mdev, ns);
1341 if (!(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE) &&
1342 (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE))
1343 drbd_khelper(mdev, "pri-on-incon-degr");
1345 /* Here we have the actions that are performed after a
1346 state change. This function might sleep */
1350 if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) {
1351 if (ns.conn == C_CONNECTED)
1352 what = resend, nsm.susp_nod = 0;
1353 else /* ns.conn > C_CONNECTED */
1354 dev_err(DEV, "Unexpected Resync going on!\n");
1357 if (os.disk == D_ATTACHING && ns.disk > D_ATTACHING)
1358 what = restart_frozen_disk_io, nsm.susp_nod = 0;
1363 /* case1: The outdate peer handler is successful: */
1364 if (os.pdsk > D_OUTDATED && ns.pdsk <= D_OUTDATED) {
1366 if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
1367 drbd_uuid_new_current(mdev);
1368 clear_bit(NEW_CUR_UUID, &mdev->flags);
1370 spin_lock_irq(&mdev->req_lock);
1371 _drbd_set_state(_NS(mdev, susp_fen, 0), CS_VERBOSE, NULL);
1372 spin_unlock_irq(&mdev->req_lock);
1374 /* case2: The connection was established again: */
1375 if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) {
1376 clear_bit(NEW_CUR_UUID, &mdev->flags);
1382 if (what != nothing) {
1383 spin_lock_irq(&mdev->req_lock);
1384 _tl_restart(mdev, what);
1385 nsm.i &= mdev->state.i;
1386 _drbd_set_state(mdev, nsm, CS_VERBOSE, NULL);
1387 spin_unlock_irq(&mdev->req_lock);
1390 /* Became sync source. With protocol >= 96, we still need to send out
1391 * the sync uuid now. Need to do that before any drbd_send_state, or
1392 * the other side may go "paused sync" before receiving the sync uuids,
1393 * which is unexpected. */
1394 if ((os.conn != C_SYNC_SOURCE && os.conn != C_PAUSED_SYNC_S) &&
1395 (ns.conn == C_SYNC_SOURCE || ns.conn == C_PAUSED_SYNC_S) &&
1396 mdev->agreed_pro_version >= 96 && get_ldev(mdev)) {
1397 drbd_gen_and_send_sync_uuid(mdev);
1401 /* Do not change the order of the if above and the two below... */
1402 if (os.pdsk == D_DISKLESS && ns.pdsk > D_DISKLESS) { /* attach on the peer */
1403 drbd_send_uuids(mdev);
1404 drbd_send_state(mdev);
1406 if (os.conn != C_WF_BITMAP_S && ns.conn == C_WF_BITMAP_S)
1407 drbd_queue_bitmap_io(mdev, &drbd_send_bitmap, NULL, "send_bitmap (WFBitMapS)");
1409 /* Lost contact to peer's copy of the data */
1410 if ((os.pdsk >= D_INCONSISTENT &&
1411 os.pdsk != D_UNKNOWN &&
1412 os.pdsk != D_OUTDATED)
1413 && (ns.pdsk < D_INCONSISTENT ||
1414 ns.pdsk == D_UNKNOWN ||
1415 ns.pdsk == D_OUTDATED)) {
1416 if (get_ldev(mdev)) {
1417 if ((ns.role == R_PRIMARY || ns.peer == R_PRIMARY) &&
1418 mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) {
1419 if (is_susp(mdev->state)) {
1420 set_bit(NEW_CUR_UUID, &mdev->flags);
1422 drbd_uuid_new_current(mdev);
1423 drbd_send_uuids(mdev);
1430 if (ns.pdsk < D_INCONSISTENT && get_ldev(mdev)) {
1431 if (ns.peer == R_PRIMARY && mdev->ldev->md.uuid[UI_BITMAP] == 0) {
1432 drbd_uuid_new_current(mdev);
1433 drbd_send_uuids(mdev);
1436 /* D_DISKLESS Peer becomes secondary */
1437 if (os.peer == R_PRIMARY && ns.peer == R_SECONDARY)
1438 drbd_bitmap_io_from_worker(mdev, &drbd_bm_write, "demote diskless peer");
1442 if (os.role == R_PRIMARY && ns.role == R_SECONDARY && get_ldev(mdev)) {
1443 drbd_bitmap_io_from_worker(mdev, &drbd_bm_write, "demote");
1447 /* Last part of the attaching process ... */
1448 if (ns.conn >= C_CONNECTED &&
1449 os.disk == D_ATTACHING && ns.disk == D_NEGOTIATING) {
1450 drbd_send_sizes(mdev, 0, 0); /* to start sync... */
1451 drbd_send_uuids(mdev);
1452 drbd_send_state(mdev);
1455 /* We want to pause/continue resync, tell peer. */
1456 if (ns.conn >= C_CONNECTED &&
1457 ((os.aftr_isp != ns.aftr_isp) ||
1458 (os.user_isp != ns.user_isp)))
1459 drbd_send_state(mdev);
1461 /* In case one of the isp bits got set, suspend other devices. */
1462 if ((!os.aftr_isp && !os.peer_isp && !os.user_isp) &&
1463 (ns.aftr_isp || ns.peer_isp || ns.user_isp))
1464 suspend_other_sg(mdev);
1466 /* Make sure the peer gets informed about eventual state
1467 changes (ISP bits) while we were in WFReportParams. */
1468 if (os.conn == C_WF_REPORT_PARAMS && ns.conn >= C_CONNECTED)
1469 drbd_send_state(mdev);
1471 if (os.conn != C_AHEAD && ns.conn == C_AHEAD)
1472 drbd_send_state(mdev);
1474 /* We are in the progress to start a full sync... */
1475 if ((os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) ||
1476 (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S))
1477 drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, &abw_start_sync, "set_n_write from StartingSync");
1479 /* We are invalidating our self... */
1480 if (os.conn < C_CONNECTED && ns.conn < C_CONNECTED &&
1481 os.disk > D_INCONSISTENT && ns.disk == D_INCONSISTENT)
1482 drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, NULL, "set_n_write from invalidate");
1484 /* first half of local IO error, failure to attach,
1485 * or administrative detach */
1486 if (os.disk != D_FAILED && ns.disk == D_FAILED) {
1487 enum drbd_io_error_p eh;
1489 /* corresponding get_ldev was in __drbd_set_state, to serialize
1490 * our cleanup here with the transition to D_DISKLESS,
1491 * so it is safe to dreference ldev here. */
1492 eh = mdev->ldev->dc.on_io_error;
1493 was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags);
1495 /* current state still has to be D_FAILED,
1496 * there is only one way out: to D_DISKLESS,
1497 * and that may only happen after our put_ldev below. */
1498 if (mdev->state.disk != D_FAILED)
1500 "ASSERT FAILED: disk is %s during detach\n",
1501 drbd_disk_str(mdev->state.disk));
1503 if (drbd_send_state(mdev))
1504 dev_warn(DEV, "Notified peer that I am detaching my disk\n");
1506 dev_err(DEV, "Sending state for detaching disk failed\n");
1508 drbd_rs_cancel_all(mdev);
1510 /* In case we want to get something to stable storage still,
1511 * this may be the last chance.
1512 * Following put_ldev may transition to D_DISKLESS. */
1516 if (was_io_error && eh == EP_CALL_HELPER)
1517 drbd_khelper(mdev, "local-io-error");
1520 /* second half of local IO error, failure to attach,
1521 * or administrative detach,
1522 * after local_cnt references have reached zero again */
1523 if (os.disk != D_DISKLESS && ns.disk == D_DISKLESS) {
1524 /* We must still be diskless,
1525 * re-attach has to be serialized with this! */
1526 if (mdev->state.disk != D_DISKLESS)
1528 "ASSERT FAILED: disk is %s while going diskless\n",
1529 drbd_disk_str(mdev->state.disk));
1532 mdev->rs_failed = 0;
1533 atomic_set(&mdev->rs_pending_cnt, 0);
1535 if (drbd_send_state(mdev))
1536 dev_warn(DEV, "Notified peer that I'm now diskless.\n");
1538 dev_err(DEV, "Sending state for being diskless failed\n");
1539 /* corresponding get_ldev in __drbd_set_state
1540 * this may finaly trigger drbd_ldev_destroy. */
1544 /* Disks got bigger while they were detached */
1545 if (ns.disk > D_NEGOTIATING && ns.pdsk > D_NEGOTIATING &&
1546 test_and_clear_bit(RESYNC_AFTER_NEG, &mdev->flags)) {
1547 if (ns.conn == C_CONNECTED)
1548 resync_after_online_grow(mdev);
1551 /* A resync finished or aborted, wake paused devices... */
1552 if ((os.conn > C_CONNECTED && ns.conn <= C_CONNECTED) ||
1553 (os.peer_isp && !ns.peer_isp) ||
1554 (os.user_isp && !ns.user_isp))
1555 resume_next_sg(mdev);
1557 /* sync target done with resync. Explicitly notify peer, even though
1558 * it should (at least for non-empty resyncs) already know itself. */
1559 if (os.disk < D_UP_TO_DATE && os.conn >= C_SYNC_SOURCE && ns.conn == C_CONNECTED)
1560 drbd_send_state(mdev);
1562 if (os.conn > C_CONNECTED && ns.conn == C_CONNECTED)
1563 drbd_queue_bitmap_io(mdev, &drbd_bm_write, NULL, "write from resync_finished");
1565 /* free tl_hash if we Got thawed and are C_STANDALONE */
1566 if (ns.conn == C_STANDALONE && !is_susp(ns) && mdev->tl_hash)
1567 drbd_free_tl_hash(mdev);
1569 /* Upon network connection, we need to start the receiver */
1570 if (os.conn == C_STANDALONE && ns.conn == C_UNCONNECTED)
1571 drbd_thread_start(&mdev->receiver);
1573 /* Terminate worker thread if we are unconfigured - it will be
1574 restarted as needed... */
1575 if (ns.disk == D_DISKLESS &&
1576 ns.conn == C_STANDALONE &&
1577 ns.role == R_SECONDARY) {
1578 if (os.aftr_isp != ns.aftr_isp)
1579 resume_next_sg(mdev);
1580 /* set in __drbd_set_state, unless CONFIG_PENDING was set */
1581 if (test_bit(DEVICE_DYING, &mdev->flags))
1582 drbd_thread_stop_nowait(&mdev->worker);
1589 static int drbd_thread_setup(void *arg)
1591 struct drbd_thread *thi = (struct drbd_thread *) arg;
1592 struct drbd_conf *mdev = thi->mdev;
1593 unsigned long flags;
1597 retval = thi->function(thi);
1599 spin_lock_irqsave(&thi->t_lock, flags);
1601 /* if the receiver has been "Exiting", the last thing it did
1602 * was set the conn state to "StandAlone",
1603 * if now a re-connect request comes in, conn state goes C_UNCONNECTED,
1604 * and receiver thread will be "started".
1605 * drbd_thread_start needs to set "Restarting" in that case.
1606 * t_state check and assignment needs to be within the same spinlock,
1607 * so either thread_start sees Exiting, and can remap to Restarting,
1608 * or thread_start see None, and can proceed as normal.
1611 if (thi->t_state == Restarting) {
1612 dev_info(DEV, "Restarting %s\n", current->comm);
1613 thi->t_state = Running;
1614 spin_unlock_irqrestore(&thi->t_lock, flags);
1619 thi->t_state = None;
1621 complete(&thi->stop);
1622 spin_unlock_irqrestore(&thi->t_lock, flags);
1624 dev_info(DEV, "Terminating %s\n", current->comm);
1626 /* Release mod reference taken when thread was started */
1627 module_put(THIS_MODULE);
1631 static void drbd_thread_init(struct drbd_conf *mdev, struct drbd_thread *thi,
1632 int (*func) (struct drbd_thread *))
1634 spin_lock_init(&thi->t_lock);
1636 thi->t_state = None;
1637 thi->function = func;
1641 int drbd_thread_start(struct drbd_thread *thi)
1643 struct drbd_conf *mdev = thi->mdev;
1644 struct task_struct *nt;
1645 unsigned long flags;
1648 thi == &mdev->receiver ? "receiver" :
1649 thi == &mdev->asender ? "asender" :
1650 thi == &mdev->worker ? "worker" : "NONSENSE";
1652 /* is used from state engine doing drbd_thread_stop_nowait,
1653 * while holding the req lock irqsave */
1654 spin_lock_irqsave(&thi->t_lock, flags);
1656 switch (thi->t_state) {
1658 dev_info(DEV, "Starting %s thread (from %s [%d])\n",
1659 me, current->comm, current->pid);
1661 /* Get ref on module for thread - this is released when thread exits */
1662 if (!try_module_get(THIS_MODULE)) {
1663 dev_err(DEV, "Failed to get module reference in drbd_thread_start\n");
1664 spin_unlock_irqrestore(&thi->t_lock, flags);
1668 init_completion(&thi->stop);
1669 D_ASSERT(thi->task == NULL);
1670 thi->reset_cpu_mask = 1;
1671 thi->t_state = Running;
1672 spin_unlock_irqrestore(&thi->t_lock, flags);
1673 flush_signals(current); /* otherw. may get -ERESTARTNOINTR */
1675 nt = kthread_create(drbd_thread_setup, (void *) thi,
1676 "drbd%d_%s", mdev_to_minor(mdev), me);
1679 dev_err(DEV, "Couldn't start thread\n");
1681 module_put(THIS_MODULE);
1684 spin_lock_irqsave(&thi->t_lock, flags);
1686 thi->t_state = Running;
1687 spin_unlock_irqrestore(&thi->t_lock, flags);
1688 wake_up_process(nt);
1691 thi->t_state = Restarting;
1692 dev_info(DEV, "Restarting %s thread (from %s [%d])\n",
1693 me, current->comm, current->pid);
1698 spin_unlock_irqrestore(&thi->t_lock, flags);
1706 void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait)
1708 unsigned long flags;
1710 enum drbd_thread_state ns = restart ? Restarting : Exiting;
1712 /* may be called from state engine, holding the req lock irqsave */
1713 spin_lock_irqsave(&thi->t_lock, flags);
1715 if (thi->t_state == None) {
1716 spin_unlock_irqrestore(&thi->t_lock, flags);
1718 drbd_thread_start(thi);
1722 if (thi->t_state != ns) {
1723 if (thi->task == NULL) {
1724 spin_unlock_irqrestore(&thi->t_lock, flags);
1730 init_completion(&thi->stop);
1731 if (thi->task != current)
1732 force_sig(DRBD_SIGKILL, thi->task);
1736 spin_unlock_irqrestore(&thi->t_lock, flags);
1739 wait_for_completion(&thi->stop);
1744 * drbd_calc_cpu_mask() - Generate CPU masks, spread over all CPUs
1745 * @mdev: DRBD device.
1747 * Forces all threads of a device onto the same CPU. This is beneficial for
1748 * DRBD's performance. May be overwritten by user's configuration.
1750 void drbd_calc_cpu_mask(struct drbd_conf *mdev)
1754 /* user override. */
1755 if (cpumask_weight(mdev->cpu_mask))
1758 ord = mdev_to_minor(mdev) % cpumask_weight(cpu_online_mask);
1759 for_each_online_cpu(cpu) {
1761 cpumask_set_cpu(cpu, mdev->cpu_mask);
1765 /* should not be reached */
1766 cpumask_setall(mdev->cpu_mask);
1770 * drbd_thread_current_set_cpu() - modifies the cpu mask of the _current_ thread
1771 * @mdev: DRBD device.
1773 * call in the "main loop" of _all_ threads, no need for any mutex, current won't die
1776 void drbd_thread_current_set_cpu(struct drbd_conf *mdev)
1778 struct task_struct *p = current;
1779 struct drbd_thread *thi =
1780 p == mdev->asender.task ? &mdev->asender :
1781 p == mdev->receiver.task ? &mdev->receiver :
1782 p == mdev->worker.task ? &mdev->worker :
1786 if (!thi->reset_cpu_mask)
1788 thi->reset_cpu_mask = 0;
1789 set_cpus_allowed_ptr(p, mdev->cpu_mask);
1793 /* the appropriate socket mutex must be held already */
1794 int _drbd_send_cmd(struct drbd_conf *mdev, struct socket *sock,
1795 enum drbd_packets cmd, struct p_header80 *h,
1796 size_t size, unsigned msg_flags)
1800 ERR_IF(!h) return false;
1801 ERR_IF(!size) return false;
1803 h->magic = BE_DRBD_MAGIC;
1804 h->command = cpu_to_be16(cmd);
1805 h->length = cpu_to_be16(size-sizeof(struct p_header80));
1807 sent = drbd_send(mdev, sock, h, size, msg_flags);
1809 ok = (sent == size);
1811 dev_err(DEV, "short sent %s size=%d sent=%d\n",
1812 cmdname(cmd), (int)size, sent);
1816 /* don't pass the socket. we may only look at it
1817 * when we hold the appropriate socket mutex.
1819 int drbd_send_cmd(struct drbd_conf *mdev, int use_data_socket,
1820 enum drbd_packets cmd, struct p_header80 *h, size_t size)
1823 struct socket *sock;
1825 if (use_data_socket) {
1826 mutex_lock(&mdev->data.mutex);
1827 sock = mdev->data.socket;
1829 mutex_lock(&mdev->meta.mutex);
1830 sock = mdev->meta.socket;
1833 /* drbd_disconnect() could have called drbd_free_sock()
1834 * while we were waiting in down()... */
1835 if (likely(sock != NULL))
1836 ok = _drbd_send_cmd(mdev, sock, cmd, h, size, 0);
1838 if (use_data_socket)
1839 mutex_unlock(&mdev->data.mutex);
1841 mutex_unlock(&mdev->meta.mutex);
1845 int drbd_send_cmd2(struct drbd_conf *mdev, enum drbd_packets cmd, char *data,
1848 struct p_header80 h;
1851 h.magic = BE_DRBD_MAGIC;
1852 h.command = cpu_to_be16(cmd);
1853 h.length = cpu_to_be16(size);
1855 if (!drbd_get_data_sock(mdev))
1859 drbd_send(mdev, mdev->data.socket, &h, sizeof(h), 0));
1861 drbd_send(mdev, mdev->data.socket, data, size, 0));
1863 drbd_put_data_sock(mdev);
1868 int drbd_send_sync_param(struct drbd_conf *mdev, struct syncer_conf *sc)
1870 struct p_rs_param_95 *p;
1871 struct socket *sock;
1873 const int apv = mdev->agreed_pro_version;
1875 size = apv <= 87 ? sizeof(struct p_rs_param)
1876 : apv == 88 ? sizeof(struct p_rs_param)
1877 + strlen(mdev->sync_conf.verify_alg) + 1
1878 : apv <= 94 ? sizeof(struct p_rs_param_89)
1879 : /* apv >= 95 */ sizeof(struct p_rs_param_95);
1881 /* used from admin command context and receiver/worker context.
1882 * to avoid kmalloc, grab the socket right here,
1883 * then use the pre-allocated sbuf there */
1884 mutex_lock(&mdev->data.mutex);
1885 sock = mdev->data.socket;
1887 if (likely(sock != NULL)) {
1888 enum drbd_packets cmd = apv >= 89 ? P_SYNC_PARAM89 : P_SYNC_PARAM;
1890 p = &mdev->data.sbuf.rs_param_95;
1892 /* initialize verify_alg and csums_alg */
1893 memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX);
1895 p->rate = cpu_to_be32(sc->rate);
1896 p->c_plan_ahead = cpu_to_be32(sc->c_plan_ahead);
1897 p->c_delay_target = cpu_to_be32(sc->c_delay_target);
1898 p->c_fill_target = cpu_to_be32(sc->c_fill_target);
1899 p->c_max_rate = cpu_to_be32(sc->c_max_rate);
1902 strcpy(p->verify_alg, mdev->sync_conf.verify_alg);
1904 strcpy(p->csums_alg, mdev->sync_conf.csums_alg);
1906 rv = _drbd_send_cmd(mdev, sock, cmd, &p->head, size, 0);
1908 rv = 0; /* not ok */
1910 mutex_unlock(&mdev->data.mutex);
1915 int drbd_send_protocol(struct drbd_conf *mdev)
1917 struct p_protocol *p;
1920 size = sizeof(struct p_protocol);
1922 if (mdev->agreed_pro_version >= 87)
1923 size += strlen(mdev->net_conf->integrity_alg) + 1;
1925 /* we must not recurse into our own queue,
1926 * as that is blocked during handshake */
1927 p = kmalloc(size, GFP_NOIO);
1931 p->protocol = cpu_to_be32(mdev->net_conf->wire_protocol);
1932 p->after_sb_0p = cpu_to_be32(mdev->net_conf->after_sb_0p);
1933 p->after_sb_1p = cpu_to_be32(mdev->net_conf->after_sb_1p);
1934 p->after_sb_2p = cpu_to_be32(mdev->net_conf->after_sb_2p);
1935 p->two_primaries = cpu_to_be32(mdev->net_conf->two_primaries);
1938 if (mdev->net_conf->want_lose)
1940 if (mdev->net_conf->dry_run) {
1941 if (mdev->agreed_pro_version >= 92)
1944 dev_err(DEV, "--dry-run is not supported by peer");
1949 p->conn_flags = cpu_to_be32(cf);
1951 if (mdev->agreed_pro_version >= 87)
1952 strcpy(p->integrity_alg, mdev->net_conf->integrity_alg);
1954 rv = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_PROTOCOL,
1955 (struct p_header80 *)p, size);
1960 int _drbd_send_uuids(struct drbd_conf *mdev, u64 uuid_flags)
1965 if (!get_ldev_if_state(mdev, D_NEGOTIATING))
1968 for (i = UI_CURRENT; i < UI_SIZE; i++)
1969 p.uuid[i] = mdev->ldev ? cpu_to_be64(mdev->ldev->md.uuid[i]) : 0;
1971 mdev->comm_bm_set = drbd_bm_total_weight(mdev);
1972 p.uuid[UI_SIZE] = cpu_to_be64(mdev->comm_bm_set);
1973 uuid_flags |= mdev->net_conf->want_lose ? 1 : 0;
1974 uuid_flags |= test_bit(CRASHED_PRIMARY, &mdev->flags) ? 2 : 0;
1975 uuid_flags |= mdev->new_state_tmp.disk == D_INCONSISTENT ? 4 : 0;
1976 p.uuid[UI_FLAGS] = cpu_to_be64(uuid_flags);
1980 return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_UUIDS,
1981 (struct p_header80 *)&p, sizeof(p));
1984 int drbd_send_uuids(struct drbd_conf *mdev)
1986 return _drbd_send_uuids(mdev, 0);
1989 int drbd_send_uuids_skip_initial_sync(struct drbd_conf *mdev)
1991 return _drbd_send_uuids(mdev, 8);
1994 int drbd_gen_and_send_sync_uuid(struct drbd_conf *mdev)
1999 D_ASSERT(mdev->state.disk == D_UP_TO_DATE);
2001 get_random_bytes(&uuid, sizeof(u64));
2002 drbd_uuid_set(mdev, UI_BITMAP, uuid);
2004 p.uuid = cpu_to_be64(uuid);
2006 return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_SYNC_UUID,
2007 (struct p_header80 *)&p, sizeof(p));
2010 int drbd_send_sizes(struct drbd_conf *mdev, int trigger_reply, enum dds_flags flags)
2013 sector_t d_size, u_size;
2017 if (get_ldev_if_state(mdev, D_NEGOTIATING)) {
2018 D_ASSERT(mdev->ldev->backing_bdev);
2019 d_size = drbd_get_max_capacity(mdev->ldev);
2020 u_size = mdev->ldev->dc.disk_size;
2021 q_order_type = drbd_queue_order_type(mdev);
2026 q_order_type = QUEUE_ORDERED_NONE;
2029 p.d_size = cpu_to_be64(d_size);
2030 p.u_size = cpu_to_be64(u_size);
2031 p.c_size = cpu_to_be64(trigger_reply ? 0 : drbd_get_capacity(mdev->this_bdev));
2032 p.max_bio_size = cpu_to_be32(queue_max_hw_sectors(mdev->rq_queue) << 9);
2033 p.queue_order_type = cpu_to_be16(q_order_type);
2034 p.dds_flags = cpu_to_be16(flags);
2036 ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_SIZES,
2037 (struct p_header80 *)&p, sizeof(p));
2042 * drbd_send_state() - Sends the drbd state to the peer
2043 * @mdev: DRBD device.
2045 int drbd_send_state(struct drbd_conf *mdev)
2047 struct socket *sock;
2051 /* Grab state lock so we wont send state if we're in the middle
2052 * of a cluster wide state change on another thread */
2053 drbd_state_lock(mdev);
2055 mutex_lock(&mdev->data.mutex);
2057 p.state = cpu_to_be32(mdev->state.i); /* Within the send mutex */
2058 sock = mdev->data.socket;
2060 if (likely(sock != NULL)) {
2061 ok = _drbd_send_cmd(mdev, sock, P_STATE,
2062 (struct p_header80 *)&p, sizeof(p), 0);
2065 mutex_unlock(&mdev->data.mutex);
2067 drbd_state_unlock(mdev);
2071 int drbd_send_state_req(struct drbd_conf *mdev,
2072 union drbd_state mask, union drbd_state val)
2074 struct p_req_state p;
2076 p.mask = cpu_to_be32(mask.i);
2077 p.val = cpu_to_be32(val.i);
2079 return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_STATE_CHG_REQ,
2080 (struct p_header80 *)&p, sizeof(p));
2083 int drbd_send_sr_reply(struct drbd_conf *mdev, enum drbd_state_rv retcode)
2085 struct p_req_state_reply p;
2087 p.retcode = cpu_to_be32(retcode);
2089 return drbd_send_cmd(mdev, USE_META_SOCKET, P_STATE_CHG_REPLY,
2090 (struct p_header80 *)&p, sizeof(p));
2093 int fill_bitmap_rle_bits(struct drbd_conf *mdev,
2094 struct p_compressed_bm *p,
2095 struct bm_xfer_ctx *c)
2097 struct bitstream bs;
2098 unsigned long plain_bits;
2105 /* may we use this feature? */
2106 if ((mdev->sync_conf.use_rle == 0) ||
2107 (mdev->agreed_pro_version < 90))
2110 if (c->bit_offset >= c->bm_bits)
2111 return 0; /* nothing to do. */
2113 /* use at most thus many bytes */
2114 bitstream_init(&bs, p->code, BM_PACKET_VLI_BYTES_MAX, 0);
2115 memset(p->code, 0, BM_PACKET_VLI_BYTES_MAX);
2116 /* plain bits covered in this code string */
2119 /* p->encoding & 0x80 stores whether the first run length is set.
2120 * bit offset is implicit.
2121 * start with toggle == 2 to be able to tell the first iteration */
2124 /* see how much plain bits we can stuff into one packet
2125 * using RLE and VLI. */
2127 tmp = (toggle == 0) ? _drbd_bm_find_next_zero(mdev, c->bit_offset)
2128 : _drbd_bm_find_next(mdev, c->bit_offset);
2131 rl = tmp - c->bit_offset;
2133 if (toggle == 2) { /* first iteration */
2135 /* the first checked bit was set,
2136 * store start value, */
2137 DCBP_set_start(p, 1);
2138 /* but skip encoding of zero run length */
2142 DCBP_set_start(p, 0);
2145 /* paranoia: catch zero runlength.
2146 * can only happen if bitmap is modified while we scan it. */
2148 dev_err(DEV, "unexpected zero runlength while encoding bitmap "
2149 "t:%u bo:%lu\n", toggle, c->bit_offset);
2153 bits = vli_encode_bits(&bs, rl);
2154 if (bits == -ENOBUFS) /* buffer full */
2157 dev_err(DEV, "error while encoding bitmap: %d\n", bits);
2163 c->bit_offset = tmp;
2164 } while (c->bit_offset < c->bm_bits);
2166 len = bs.cur.b - p->code + !!bs.cur.bit;
2168 if (plain_bits < (len << 3)) {
2169 /* incompressible with this method.
2170 * we need to rewind both word and bit position. */
2171 c->bit_offset -= plain_bits;
2172 bm_xfer_ctx_bit_to_word_offset(c);
2173 c->bit_offset = c->word_offset * BITS_PER_LONG;
2177 /* RLE + VLI was able to compress it just fine.
2178 * update c->word_offset. */
2179 bm_xfer_ctx_bit_to_word_offset(c);
2181 /* store pad_bits */
2182 DCBP_set_pad_bits(p, (8 - bs.cur.bit) & 0x7);
2188 * send_bitmap_rle_or_plain
2190 * Return 0 when done, 1 when another iteration is needed, and a negative error
2191 * code upon failure.
2194 send_bitmap_rle_or_plain(struct drbd_conf *mdev,
2195 struct p_header80 *h, struct bm_xfer_ctx *c)
2197 struct p_compressed_bm *p = (void*)h;
2198 unsigned long num_words;
2202 len = fill_bitmap_rle_bits(mdev, p, c);
2208 DCBP_set_code(p, RLE_VLI_Bits);
2209 ok = _drbd_send_cmd(mdev, mdev->data.socket, P_COMPRESSED_BITMAP, h,
2210 sizeof(*p) + len, 0);
2213 c->bytes[0] += sizeof(*p) + len;
2215 if (c->bit_offset >= c->bm_bits)
2218 /* was not compressible.
2219 * send a buffer full of plain text bits instead. */
2220 num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset);
2221 len = num_words * sizeof(long);
2223 drbd_bm_get_lel(mdev, c->word_offset, num_words, (unsigned long*)h->payload);
2224 ok = _drbd_send_cmd(mdev, mdev->data.socket, P_BITMAP,
2225 h, sizeof(struct p_header80) + len, 0);
2226 c->word_offset += num_words;
2227 c->bit_offset = c->word_offset * BITS_PER_LONG;
2230 c->bytes[1] += sizeof(struct p_header80) + len;
2232 if (c->bit_offset > c->bm_bits)
2233 c->bit_offset = c->bm_bits;
2237 INFO_bm_xfer_stats(mdev, "send", c);
2245 /* See the comment at receive_bitmap() */
2246 int _drbd_send_bitmap(struct drbd_conf *mdev)
2248 struct bm_xfer_ctx c;
2249 struct p_header80 *p;
2252 ERR_IF(!mdev->bitmap) return false;
2254 /* maybe we should use some per thread scratch page,
2255 * and allocate that during initial device creation? */
2256 p = (struct p_header80 *) __get_free_page(GFP_NOIO);
2258 dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__);
2262 if (get_ldev(mdev)) {
2263 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
2264 dev_info(DEV, "Writing the whole bitmap, MDF_FullSync was set.\n");
2265 drbd_bm_set_all(mdev);
2266 if (drbd_bm_write(mdev)) {
2267 /* write_bm did fail! Leave full sync flag set in Meta P_DATA
2268 * but otherwise process as per normal - need to tell other
2269 * side that a full resync is required! */
2270 dev_err(DEV, "Failed to write bitmap to disk!\n");
2272 drbd_md_clear_flag(mdev, MDF_FULL_SYNC);
2279 c = (struct bm_xfer_ctx) {
2280 .bm_bits = drbd_bm_bits(mdev),
2281 .bm_words = drbd_bm_words(mdev),
2285 err = send_bitmap_rle_or_plain(mdev, p, &c);
2288 free_page((unsigned long) p);
2292 int drbd_send_bitmap(struct drbd_conf *mdev)
2296 if (!drbd_get_data_sock(mdev))
2298 err = !_drbd_send_bitmap(mdev);
2299 drbd_put_data_sock(mdev);
2303 int drbd_send_b_ack(struct drbd_conf *mdev, u32 barrier_nr, u32 set_size)
2306 struct p_barrier_ack p;
2308 p.barrier = barrier_nr;
2309 p.set_size = cpu_to_be32(set_size);
2311 if (mdev->state.conn < C_CONNECTED)
2313 ok = drbd_send_cmd(mdev, USE_META_SOCKET, P_BARRIER_ACK,
2314 (struct p_header80 *)&p, sizeof(p));
2319 * _drbd_send_ack() - Sends an ack packet
2320 * @mdev: DRBD device.
2321 * @cmd: Packet command code.
2322 * @sector: sector, needs to be in big endian byte order
2323 * @blksize: size in byte, needs to be in big endian byte order
2324 * @block_id: Id, big endian byte order
2326 static int _drbd_send_ack(struct drbd_conf *mdev, enum drbd_packets cmd,
2332 struct p_block_ack p;
2335 p.block_id = block_id;
2336 p.blksize = blksize;
2337 p.seq_num = cpu_to_be32(atomic_add_return(1, &mdev->packet_seq));
2339 if (!mdev->meta.socket || mdev->state.conn < C_CONNECTED)
2341 ok = drbd_send_cmd(mdev, USE_META_SOCKET, cmd,
2342 (struct p_header80 *)&p, sizeof(p));
2346 /* dp->sector and dp->block_id already/still in network byte order,
2347 * data_size is payload size according to dp->head,
2348 * and may need to be corrected for digest size. */
2349 int drbd_send_ack_dp(struct drbd_conf *mdev, enum drbd_packets cmd,
2350 struct p_data *dp, int data_size)
2352 data_size -= (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ?
2353 crypto_hash_digestsize(mdev->integrity_r_tfm) : 0;
2354 return _drbd_send_ack(mdev, cmd, dp->sector, cpu_to_be32(data_size),
2358 int drbd_send_ack_rp(struct drbd_conf *mdev, enum drbd_packets cmd,
2359 struct p_block_req *rp)
2361 return _drbd_send_ack(mdev, cmd, rp->sector, rp->blksize, rp->block_id);
2365 * drbd_send_ack() - Sends an ack packet
2366 * @mdev: DRBD device.
2367 * @cmd: Packet command code.
2370 int drbd_send_ack(struct drbd_conf *mdev,
2371 enum drbd_packets cmd, struct drbd_epoch_entry *e)
2373 return _drbd_send_ack(mdev, cmd,
2374 cpu_to_be64(e->sector),
2375 cpu_to_be32(e->size),
2379 /* This function misuses the block_id field to signal if the blocks
2380 * are is sync or not. */
2381 int drbd_send_ack_ex(struct drbd_conf *mdev, enum drbd_packets cmd,
2382 sector_t sector, int blksize, u64 block_id)
2384 return _drbd_send_ack(mdev, cmd,
2385 cpu_to_be64(sector),
2386 cpu_to_be32(blksize),
2387 cpu_to_be64(block_id));
2390 int drbd_send_drequest(struct drbd_conf *mdev, int cmd,
2391 sector_t sector, int size, u64 block_id)
2394 struct p_block_req p;
2396 p.sector = cpu_to_be64(sector);
2397 p.block_id = block_id;
2398 p.blksize = cpu_to_be32(size);
2400 ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, cmd,
2401 (struct p_header80 *)&p, sizeof(p));
2405 int drbd_send_drequest_csum(struct drbd_conf *mdev,
2406 sector_t sector, int size,
2407 void *digest, int digest_size,
2408 enum drbd_packets cmd)
2411 struct p_block_req p;
2413 p.sector = cpu_to_be64(sector);
2414 p.block_id = BE_DRBD_MAGIC + 0xbeef;
2415 p.blksize = cpu_to_be32(size);
2417 p.head.magic = BE_DRBD_MAGIC;
2418 p.head.command = cpu_to_be16(cmd);
2419 p.head.length = cpu_to_be16(sizeof(p) - sizeof(struct p_header80) + digest_size);
2421 mutex_lock(&mdev->data.mutex);
2423 ok = (sizeof(p) == drbd_send(mdev, mdev->data.socket, &p, sizeof(p), 0));
2424 ok = ok && (digest_size == drbd_send(mdev, mdev->data.socket, digest, digest_size, 0));
2426 mutex_unlock(&mdev->data.mutex);
2431 int drbd_send_ov_request(struct drbd_conf *mdev, sector_t sector, int size)
2434 struct p_block_req p;
2436 p.sector = cpu_to_be64(sector);
2437 p.block_id = BE_DRBD_MAGIC + 0xbabe;
2438 p.blksize = cpu_to_be32(size);
2440 ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_OV_REQUEST,
2441 (struct p_header80 *)&p, sizeof(p));
2445 /* called on sndtimeo
2446 * returns false if we should retry,
2447 * true if we think connection is dead
2449 static int we_should_drop_the_connection(struct drbd_conf *mdev, struct socket *sock)
2452 /* long elapsed = (long)(jiffies - mdev->last_received); */
2454 drop_it = mdev->meta.socket == sock
2455 || !mdev->asender.task
2456 || get_t_state(&mdev->asender) != Running
2457 || mdev->state.conn < C_CONNECTED;
2462 drop_it = !--mdev->ko_count;
2464 dev_err(DEV, "[%s/%d] sock_sendmsg time expired, ko = %u\n",
2465 current->comm, current->pid, mdev->ko_count);
2469 return drop_it; /* && (mdev->state == R_PRIMARY) */;
2472 /* The idea of sendpage seems to be to put some kind of reference
2473 * to the page into the skb, and to hand it over to the NIC. In
2474 * this process get_page() gets called.
2476 * As soon as the page was really sent over the network put_page()
2477 * gets called by some part of the network layer. [ NIC driver? ]
2479 * [ get_page() / put_page() increment/decrement the count. If count
2480 * reaches 0 the page will be freed. ]
2482 * This works nicely with pages from FSs.
2483 * But this means that in protocol A we might signal IO completion too early!
2485 * In order not to corrupt data during a resync we must make sure
2486 * that we do not reuse our own buffer pages (EEs) to early, therefore
2487 * we have the net_ee list.
2489 * XFS seems to have problems, still, it submits pages with page_count == 0!
2490 * As a workaround, we disable sendpage on pages
2491 * with page_count == 0 or PageSlab.
2493 static int _drbd_no_send_page(struct drbd_conf *mdev, struct page *page,
2494 int offset, size_t size, unsigned msg_flags)
2496 int sent = drbd_send(mdev, mdev->data.socket, kmap(page) + offset, size, msg_flags);
2499 mdev->send_cnt += size>>9;
2500 return sent == size;
2503 static int _drbd_send_page(struct drbd_conf *mdev, struct page *page,
2504 int offset, size_t size, unsigned msg_flags)
2506 mm_segment_t oldfs = get_fs();
2510 /* e.g. XFS meta- & log-data is in slab pages, which have a
2511 * page_count of 0 and/or have PageSlab() set.
2512 * we cannot use send_page for those, as that does get_page();
2513 * put_page(); and would cause either a VM_BUG directly, or
2514 * __page_cache_release a page that would actually still be referenced
2515 * by someone, leading to some obscure delayed Oops somewhere else. */
2516 if (disable_sendpage || (page_count(page) < 1) || PageSlab(page))
2517 return _drbd_no_send_page(mdev, page, offset, size, msg_flags);
2519 msg_flags |= MSG_NOSIGNAL;
2520 drbd_update_congested(mdev);
2523 sent = mdev->data.socket->ops->sendpage(mdev->data.socket, page,
2526 if (sent == -EAGAIN) {
2527 if (we_should_drop_the_connection(mdev,
2534 dev_warn(DEV, "%s: size=%d len=%d sent=%d\n",
2535 __func__, (int)size, len, sent);
2540 } while (len > 0 /* THINK && mdev->cstate >= C_CONNECTED*/);
2542 clear_bit(NET_CONGESTED, &mdev->flags);
2546 mdev->send_cnt += size>>9;
2550 static int _drbd_send_bio(struct drbd_conf *mdev, struct bio *bio)
2552 struct bio_vec *bvec;
2554 /* hint all but last page with MSG_MORE */
2555 __bio_for_each_segment(bvec, bio, i, 0) {
2556 if (!_drbd_no_send_page(mdev, bvec->bv_page,
2557 bvec->bv_offset, bvec->bv_len,
2558 i == bio->bi_vcnt -1 ? 0 : MSG_MORE))
2564 static int _drbd_send_zc_bio(struct drbd_conf *mdev, struct bio *bio)
2566 struct bio_vec *bvec;
2568 /* hint all but last page with MSG_MORE */
2569 __bio_for_each_segment(bvec, bio, i, 0) {
2570 if (!_drbd_send_page(mdev, bvec->bv_page,
2571 bvec->bv_offset, bvec->bv_len,
2572 i == bio->bi_vcnt -1 ? 0 : MSG_MORE))
2578 static int _drbd_send_zc_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e)
2580 struct page *page = e->pages;
2581 unsigned len = e->size;
2582 /* hint all but last page with MSG_MORE */
2583 page_chain_for_each(page) {
2584 unsigned l = min_t(unsigned, len, PAGE_SIZE);
2585 if (!_drbd_send_page(mdev, page, 0, l,
2586 page_chain_next(page) ? MSG_MORE : 0))
2593 static u32 bio_flags_to_wire(struct drbd_conf *mdev, unsigned long bi_rw)
2595 if (mdev->agreed_pro_version >= 95)
2596 return (bi_rw & REQ_SYNC ? DP_RW_SYNC : 0) |
2597 (bi_rw & REQ_FUA ? DP_FUA : 0) |
2598 (bi_rw & REQ_FLUSH ? DP_FLUSH : 0) |
2599 (bi_rw & REQ_DISCARD ? DP_DISCARD : 0);
2601 return bi_rw & REQ_SYNC ? DP_RW_SYNC : 0;
2604 /* Used to send write requests
2605 * R_PRIMARY -> Peer (P_DATA)
2607 int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req)
2611 unsigned int dp_flags = 0;
2615 if (!drbd_get_data_sock(mdev))
2618 dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_w_tfm) ?
2619 crypto_hash_digestsize(mdev->integrity_w_tfm) : 0;
2621 if (req->size <= DRBD_MAX_SIZE_H80_PACKET) {
2622 p.head.h80.magic = BE_DRBD_MAGIC;
2623 p.head.h80.command = cpu_to_be16(P_DATA);
2625 cpu_to_be16(sizeof(p) - sizeof(union p_header) + dgs + req->size);
2627 p.head.h95.magic = BE_DRBD_MAGIC_BIG;
2628 p.head.h95.command = cpu_to_be16(P_DATA);
2630 cpu_to_be32(sizeof(p) - sizeof(union p_header) + dgs + req->size);
2633 p.sector = cpu_to_be64(req->sector);
2634 p.block_id = (unsigned long)req;
2635 p.seq_num = cpu_to_be32(req->seq_num =
2636 atomic_add_return(1, &mdev->packet_seq));
2638 dp_flags = bio_flags_to_wire(mdev, req->master_bio->bi_rw);
2640 if (mdev->state.conn >= C_SYNC_SOURCE &&
2641 mdev->state.conn <= C_PAUSED_SYNC_T)
2642 dp_flags |= DP_MAY_SET_IN_SYNC;
2644 p.dp_flags = cpu_to_be32(dp_flags);
2645 set_bit(UNPLUG_REMOTE, &mdev->flags);
2647 drbd_send(mdev, mdev->data.socket, &p, sizeof(p), dgs ? MSG_MORE : 0));
2649 dgb = mdev->int_dig_out;
2650 drbd_csum_bio(mdev, mdev->integrity_w_tfm, req->master_bio, dgb);
2651 ok = dgs == drbd_send(mdev, mdev->data.socket, dgb, dgs, 0);
2654 /* For protocol A, we have to memcpy the payload into
2655 * socket buffers, as we may complete right away
2656 * as soon as we handed it over to tcp, at which point the data
2657 * pages may become invalid.
2659 * For data-integrity enabled, we copy it as well, so we can be
2660 * sure that even if the bio pages may still be modified, it
2661 * won't change the data on the wire, thus if the digest checks
2662 * out ok after sending on this side, but does not fit on the
2663 * receiving side, we sure have detected corruption elsewhere.
2665 if (mdev->net_conf->wire_protocol == DRBD_PROT_A || dgs)
2666 ok = _drbd_send_bio(mdev, req->master_bio);
2668 ok = _drbd_send_zc_bio(mdev, req->master_bio);
2670 /* double check digest, sometimes buffers have been modified in flight. */
2671 if (dgs > 0 && dgs <= 64) {
2672 /* 64 byte, 512 bit, is the larges digest size
2673 * currently supported in kernel crypto. */
2674 unsigned char digest[64];
2675 drbd_csum_bio(mdev, mdev->integrity_w_tfm, req->master_bio, digest);
2676 if (memcmp(mdev->int_dig_out, digest, dgs)) {
2678 "Digest mismatch, buffer modified by upper layers during write: %llus +%u\n",
2679 (unsigned long long)req->sector, req->size);
2681 } /* else if (dgs > 64) {
2682 ... Be noisy about digest too large ...
2686 drbd_put_data_sock(mdev);
2691 /* answer packet, used to send data back for read requests:
2692 * Peer -> (diskless) R_PRIMARY (P_DATA_REPLY)
2693 * C_SYNC_SOURCE -> C_SYNC_TARGET (P_RS_DATA_REPLY)
2695 int drbd_send_block(struct drbd_conf *mdev, enum drbd_packets cmd,
2696 struct drbd_epoch_entry *e)
2703 dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_w_tfm) ?
2704 crypto_hash_digestsize(mdev->integrity_w_tfm) : 0;
2706 if (e->size <= DRBD_MAX_SIZE_H80_PACKET) {
2707 p.head.h80.magic = BE_DRBD_MAGIC;
2708 p.head.h80.command = cpu_to_be16(cmd);
2710 cpu_to_be16(sizeof(p) - sizeof(struct p_header80) + dgs + e->size);
2712 p.head.h95.magic = BE_DRBD_MAGIC_BIG;
2713 p.head.h95.command = cpu_to_be16(cmd);
2715 cpu_to_be32(sizeof(p) - sizeof(struct p_header80) + dgs + e->size);
2718 p.sector = cpu_to_be64(e->sector);
2719 p.block_id = e->block_id;
2720 /* p.seq_num = 0; No sequence numbers here.. */
2722 /* Only called by our kernel thread.
2723 * This one may be interrupted by DRBD_SIG and/or DRBD_SIGKILL
2724 * in response to admin command or module unload.
2726 if (!drbd_get_data_sock(mdev))
2729 ok = sizeof(p) == drbd_send(mdev, mdev->data.socket, &p, sizeof(p), dgs ? MSG_MORE : 0);
2731 dgb = mdev->int_dig_out;
2732 drbd_csum_ee(mdev, mdev->integrity_w_tfm, e, dgb);
2733 ok = dgs == drbd_send(mdev, mdev->data.socket, dgb, dgs, 0);
2736 ok = _drbd_send_zc_ee(mdev, e);
2738 drbd_put_data_sock(mdev);
2743 int drbd_send_oos(struct drbd_conf *mdev, struct drbd_request *req)
2745 struct p_block_desc p;
2747 p.sector = cpu_to_be64(req->sector);
2748 p.blksize = cpu_to_be32(req->size);
2750 return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_OUT_OF_SYNC, &p.head, sizeof(p));
2754 drbd_send distinguishes two cases:
2756 Packets sent via the data socket "sock"
2757 and packets sent via the meta data socket "msock"
2760 -----------------+-------------------------+------------------------------
2761 timeout conf.timeout / 2 conf.timeout / 2
2762 timeout action send a ping via msock Abort communication
2763 and close all sockets
2767 * you must have down()ed the appropriate [m]sock_mutex elsewhere!
2769 int drbd_send(struct drbd_conf *mdev, struct socket *sock,
2770 void *buf, size_t size, unsigned msg_flags)
2779 /* THINK if (signal_pending) return ... ? */
2784 msg.msg_name = NULL;
2785 msg.msg_namelen = 0;
2786 msg.msg_control = NULL;
2787 msg.msg_controllen = 0;
2788 msg.msg_flags = msg_flags | MSG_NOSIGNAL;
2790 if (sock == mdev->data.socket) {
2791 mdev->ko_count = mdev->net_conf->ko_count;
2792 drbd_update_congested(mdev);
2796 * tcp_sendmsg does _not_ use its size parameter at all ?
2798 * -EAGAIN on timeout, -EINTR on signal.
2801 * do we need to block DRBD_SIG if sock == &meta.socket ??
2802 * otherwise wake_asender() might interrupt some send_*Ack !
2804 rv = kernel_sendmsg(sock, &msg, &iov, 1, size);
2805 if (rv == -EAGAIN) {
2806 if (we_should_drop_the_connection(mdev, sock))
2813 flush_signals(current);
2821 } while (sent < size);
2823 if (sock == mdev->data.socket)
2824 clear_bit(NET_CONGESTED, &mdev->flags);
2827 if (rv != -EAGAIN) {
2828 dev_err(DEV, "%s_sendmsg returned %d\n",
2829 sock == mdev->meta.socket ? "msock" : "sock",
2831 drbd_force_state(mdev, NS(conn, C_BROKEN_PIPE));
2833 drbd_force_state(mdev, NS(conn, C_TIMEOUT));
2839 static int drbd_open(struct block_device *bdev, fmode_t mode)
2841 struct drbd_conf *mdev = bdev->bd_disk->private_data;
2842 unsigned long flags;
2845 mutex_lock(&drbd_main_mutex);
2846 spin_lock_irqsave(&mdev->req_lock, flags);
2847 /* to have a stable mdev->state.role
2848 * and no race with updating open_cnt */
2850 if (mdev->state.role != R_PRIMARY) {
2851 if (mode & FMODE_WRITE)
2853 else if (!allow_oos)
2859 spin_unlock_irqrestore(&mdev->req_lock, flags);
2860 mutex_unlock(&drbd_main_mutex);
2865 static int drbd_release(struct gendisk *gd, fmode_t mode)
2867 struct drbd_conf *mdev = gd->private_data;
2868 mutex_lock(&drbd_main_mutex);
2870 mutex_unlock(&drbd_main_mutex);
2874 static void drbd_set_defaults(struct drbd_conf *mdev)
2876 /* This way we get a compile error when sync_conf grows,
2877 and we forgot to initialize it here */
2878 mdev->sync_conf = (struct syncer_conf) {
2879 /* .rate = */ DRBD_RATE_DEF,
2880 /* .after = */ DRBD_AFTER_DEF,
2881 /* .al_extents = */ DRBD_AL_EXTENTS_DEF,
2882 /* .verify_alg = */ {}, 0,
2883 /* .cpu_mask = */ {}, 0,
2884 /* .csums_alg = */ {}, 0,
2886 /* .on_no_data = */ DRBD_ON_NO_DATA_DEF,
2887 /* .c_plan_ahead = */ DRBD_C_PLAN_AHEAD_DEF,
2888 /* .c_delay_target = */ DRBD_C_DELAY_TARGET_DEF,
2889 /* .c_fill_target = */ DRBD_C_FILL_TARGET_DEF,
2890 /* .c_max_rate = */ DRBD_C_MAX_RATE_DEF,
2891 /* .c_min_rate = */ DRBD_C_MIN_RATE_DEF
2894 /* Have to use that way, because the layout differs between
2895 big endian and little endian */
2896 mdev->state = (union drbd_state) {
2897 { .role = R_SECONDARY,
2899 .conn = C_STANDALONE,
2908 void drbd_init_set_defaults(struct drbd_conf *mdev)
2910 /* the memset(,0,) did most of this.
2911 * note: only assignments, no allocation in here */
2913 drbd_set_defaults(mdev);
2915 atomic_set(&mdev->ap_bio_cnt, 0);
2916 atomic_set(&mdev->ap_pending_cnt, 0);
2917 atomic_set(&mdev->rs_pending_cnt, 0);
2918 atomic_set(&mdev->unacked_cnt, 0);
2919 atomic_set(&mdev->local_cnt, 0);
2920 atomic_set(&mdev->net_cnt, 0);
2921 atomic_set(&mdev->packet_seq, 0);
2922 atomic_set(&mdev->pp_in_use, 0);
2923 atomic_set(&mdev->pp_in_use_by_net, 0);
2924 atomic_set(&mdev->rs_sect_in, 0);
2925 atomic_set(&mdev->rs_sect_ev, 0);
2926 atomic_set(&mdev->ap_in_flight, 0);
2928 mutex_init(&mdev->md_io_mutex);
2929 mutex_init(&mdev->data.mutex);
2930 mutex_init(&mdev->meta.mutex);
2931 sema_init(&mdev->data.work.s, 0);
2932 sema_init(&mdev->meta.work.s, 0);
2933 mutex_init(&mdev->state_mutex);
2935 spin_lock_init(&mdev->data.work.q_lock);
2936 spin_lock_init(&mdev->meta.work.q_lock);
2938 spin_lock_init(&mdev->al_lock);
2939 spin_lock_init(&mdev->req_lock);
2940 spin_lock_init(&mdev->peer_seq_lock);
2941 spin_lock_init(&mdev->epoch_lock);
2943 INIT_LIST_HEAD(&mdev->active_ee);
2944 INIT_LIST_HEAD(&mdev->sync_ee);
2945 INIT_LIST_HEAD(&mdev->done_ee);
2946 INIT_LIST_HEAD(&mdev->read_ee);
2947 INIT_LIST_HEAD(&mdev->net_ee);
2948 INIT_LIST_HEAD(&mdev->resync_reads);
2949 INIT_LIST_HEAD(&mdev->data.work.q);
2950 INIT_LIST_HEAD(&mdev->meta.work.q);
2951 INIT_LIST_HEAD(&mdev->resync_work.list);
2952 INIT_LIST_HEAD(&mdev->unplug_work.list);
2953 INIT_LIST_HEAD(&mdev->go_diskless.list);
2954 INIT_LIST_HEAD(&mdev->md_sync_work.list);
2955 INIT_LIST_HEAD(&mdev->start_resync_work.list);
2956 INIT_LIST_HEAD(&mdev->bm_io_work.w.list);
2958 mdev->resync_work.cb = w_resync_inactive;
2959 mdev->unplug_work.cb = w_send_write_hint;
2960 mdev->go_diskless.cb = w_go_diskless;
2961 mdev->md_sync_work.cb = w_md_sync;
2962 mdev->bm_io_work.w.cb = w_bitmap_io;
2963 init_timer(&mdev->resync_timer);
2964 init_timer(&mdev->md_sync_timer);
2965 mdev->resync_timer.function = resync_timer_fn;
2966 mdev->resync_timer.data = (unsigned long) mdev;
2967 mdev->md_sync_timer.function = md_sync_timer_fn;
2968 mdev->md_sync_timer.data = (unsigned long) mdev;
2970 init_waitqueue_head(&mdev->misc_wait);
2971 init_waitqueue_head(&mdev->state_wait);
2972 init_waitqueue_head(&mdev->net_cnt_wait);
2973 init_waitqueue_head(&mdev->ee_wait);
2974 init_waitqueue_head(&mdev->al_wait);
2975 init_waitqueue_head(&mdev->seq_wait);
2977 drbd_thread_init(mdev, &mdev->receiver, drbdd_init);
2978 drbd_thread_init(mdev, &mdev->worker, drbd_worker);
2979 drbd_thread_init(mdev, &mdev->asender, drbd_asender);
2981 mdev->agreed_pro_version = PRO_VERSION_MAX;
2982 mdev->write_ordering = WO_bdev_flush;
2983 mdev->resync_wenr = LC_FREE;
2986 void drbd_mdev_cleanup(struct drbd_conf *mdev)
2989 if (mdev->receiver.t_state != None)
2990 dev_err(DEV, "ASSERT FAILED: receiver t_state == %d expected 0.\n",
2991 mdev->receiver.t_state);
2993 /* no need to lock it, I'm the only thread alive */
2994 if (atomic_read(&mdev->current_epoch->epoch_size) != 0)
2995 dev_err(DEV, "epoch_size:%d\n", atomic_read(&mdev->current_epoch->epoch_size));
3005 mdev->rs_failed = 0;
3006 mdev->rs_last_events = 0;
3007 mdev->rs_last_sect_ev = 0;
3008 for (i = 0; i < DRBD_SYNC_MARKS; i++) {
3009 mdev->rs_mark_left[i] = 0;
3010 mdev->rs_mark_time[i] = 0;
3012 D_ASSERT(mdev->net_conf == NULL);
3014 drbd_set_my_capacity(mdev, 0);
3016 /* maybe never allocated. */
3017 drbd_bm_resize(mdev, 0, 1);
3018 drbd_bm_cleanup(mdev);
3021 drbd_free_resources(mdev);
3022 clear_bit(AL_SUSPENDED, &mdev->flags);
3025 * currently we drbd_init_ee only on module load, so
3026 * we may do drbd_release_ee only on module unload!
3028 D_ASSERT(list_empty(&mdev->active_ee));
3029 D_ASSERT(list_empty(&mdev->sync_ee));
3030 D_ASSERT(list_empty(&mdev->done_ee));
3031 D_ASSERT(list_empty(&mdev->read_ee));
3032 D_ASSERT(list_empty(&mdev->net_ee));
3033 D_ASSERT(list_empty(&mdev->resync_reads));
3034 D_ASSERT(list_empty(&mdev->data.work.q));
3035 D_ASSERT(list_empty(&mdev->meta.work.q));
3036 D_ASSERT(list_empty(&mdev->resync_work.list));
3037 D_ASSERT(list_empty(&mdev->unplug_work.list));
3038 D_ASSERT(list_empty(&mdev->go_diskless.list));
3040 drbd_set_defaults(mdev);
3044 static void drbd_destroy_mempools(void)
3048 while (drbd_pp_pool) {
3049 page = drbd_pp_pool;
3050 drbd_pp_pool = (struct page *)page_private(page);
3055 /* D_ASSERT(atomic_read(&drbd_pp_vacant)==0); */
3057 if (drbd_ee_mempool)
3058 mempool_destroy(drbd_ee_mempool);
3059 if (drbd_request_mempool)
3060 mempool_destroy(drbd_request_mempool);
3062 kmem_cache_destroy(drbd_ee_cache);
3063 if (drbd_request_cache)
3064 kmem_cache_destroy(drbd_request_cache);
3065 if (drbd_bm_ext_cache)
3066 kmem_cache_destroy(drbd_bm_ext_cache);
3067 if (drbd_al_ext_cache)
3068 kmem_cache_destroy(drbd_al_ext_cache);
3070 drbd_ee_mempool = NULL;
3071 drbd_request_mempool = NULL;
3072 drbd_ee_cache = NULL;
3073 drbd_request_cache = NULL;
3074 drbd_bm_ext_cache = NULL;
3075 drbd_al_ext_cache = NULL;
3080 static int drbd_create_mempools(void)
3083 const int number = (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * minor_count;
3086 /* prepare our caches and mempools */
3087 drbd_request_mempool = NULL;
3088 drbd_ee_cache = NULL;
3089 drbd_request_cache = NULL;
3090 drbd_bm_ext_cache = NULL;
3091 drbd_al_ext_cache = NULL;
3092 drbd_pp_pool = NULL;
3095 drbd_request_cache = kmem_cache_create(
3096 "drbd_req", sizeof(struct drbd_request), 0, 0, NULL);
3097 if (drbd_request_cache == NULL)
3100 drbd_ee_cache = kmem_cache_create(
3101 "drbd_ee", sizeof(struct drbd_epoch_entry), 0, 0, NULL);
3102 if (drbd_ee_cache == NULL)
3105 drbd_bm_ext_cache = kmem_cache_create(
3106 "drbd_bm", sizeof(struct bm_extent), 0, 0, NULL);
3107 if (drbd_bm_ext_cache == NULL)
3110 drbd_al_ext_cache = kmem_cache_create(
3111 "drbd_al", sizeof(struct lc_element), 0, 0, NULL);
3112 if (drbd_al_ext_cache == NULL)
3116 drbd_request_mempool = mempool_create(number,
3117 mempool_alloc_slab, mempool_free_slab, drbd_request_cache);
3118 if (drbd_request_mempool == NULL)
3121 drbd_ee_mempool = mempool_create(number,
3122 mempool_alloc_slab, mempool_free_slab, drbd_ee_cache);
3123 if (drbd_ee_mempool == NULL)
3126 /* drbd's page pool */
3127 spin_lock_init(&drbd_pp_lock);
3129 for (i = 0; i < number; i++) {
3130 page = alloc_page(GFP_HIGHUSER);
3133 set_page_private(page, (unsigned long)drbd_pp_pool);
3134 drbd_pp_pool = page;
3136 drbd_pp_vacant = number;
3141 drbd_destroy_mempools(); /* in case we allocated some */
3145 static int drbd_notify_sys(struct notifier_block *this, unsigned long code,
3148 /* just so we have it. you never know what interesting things we
3149 * might want to do here some day...
3155 static struct notifier_block drbd_notifier = {
3156 .notifier_call = drbd_notify_sys,
3159 static void drbd_release_ee_lists(struct drbd_conf *mdev)
3163 rr = drbd_release_ee(mdev, &mdev->active_ee);
3165 dev_err(DEV, "%d EEs in active list found!\n", rr);
3167 rr = drbd_release_ee(mdev, &mdev->sync_ee);
3169 dev_err(DEV, "%d EEs in sync list found!\n", rr);
3171 rr = drbd_release_ee(mdev, &mdev->read_ee);
3173 dev_err(DEV, "%d EEs in read list found!\n", rr);
3175 rr = drbd_release_ee(mdev, &mdev->done_ee);
3177 dev_err(DEV, "%d EEs in done list found!\n", rr);
3179 rr = drbd_release_ee(mdev, &mdev->net_ee);
3181 dev_err(DEV, "%d EEs in net list found!\n", rr);
3184 /* caution. no locking.
3185 * currently only used from module cleanup code. */
3186 static void drbd_delete_device(unsigned int minor)
3188 struct drbd_conf *mdev = minor_to_mdev(minor);
3193 /* paranoia asserts */
3194 if (mdev->open_cnt != 0)
3195 dev_err(DEV, "open_cnt = %d in %s:%u", mdev->open_cnt,
3196 __FILE__ , __LINE__);
3198 ERR_IF (!list_empty(&mdev->data.work.q)) {
3199 struct list_head *lp;
3200 list_for_each(lp, &mdev->data.work.q) {
3201 dev_err(DEV, "lp = %p\n", lp);
3204 /* end paranoia asserts */
3206 del_gendisk(mdev->vdisk);
3208 /* cleanup stuff that may have been allocated during
3209 * device (re-)configuration or state changes */
3211 if (mdev->this_bdev)
3212 bdput(mdev->this_bdev);
3214 drbd_free_resources(mdev);
3216 drbd_release_ee_lists(mdev);
3218 /* should be free'd on disconnect? */
3219 kfree(mdev->ee_hash);
3221 mdev->ee_hash_s = 0;
3222 mdev->ee_hash = NULL;
3225 lc_destroy(mdev->act_log);
3226 lc_destroy(mdev->resync);
3228 kfree(mdev->p_uuid);
3229 /* mdev->p_uuid = NULL; */
3231 kfree(mdev->int_dig_out);
3232 kfree(mdev->int_dig_in);
3233 kfree(mdev->int_dig_vv);
3235 /* cleanup the rest that has been
3236 * allocated from drbd_new_device
3237 * and actually free the mdev itself */
3238 drbd_free_mdev(mdev);
3241 static void drbd_cleanup(void)
3245 unregister_reboot_notifier(&drbd_notifier);
3247 /* first remove proc,
3248 * drbdsetup uses it's presence to detect
3249 * whether DRBD is loaded.
3250 * If we would get stuck in proc removal,
3251 * but have netlink already deregistered,
3252 * some drbdsetup commands may wait forever
3256 remove_proc_entry("drbd", NULL);
3263 drbd_delete_device(i);
3264 drbd_destroy_mempools();
3269 unregister_blkdev(DRBD_MAJOR, "drbd");
3271 printk(KERN_INFO "drbd: module cleanup done.\n");
3275 * drbd_congested() - Callback for pdflush
3276 * @congested_data: User data
3277 * @bdi_bits: Bits pdflush is currently interested in
3279 * Returns 1<<BDI_async_congested and/or 1<<BDI_sync_congested if we are congested.
3281 static int drbd_congested(void *congested_data, int bdi_bits)
3283 struct drbd_conf *mdev = congested_data;
3284 struct request_queue *q;
3288 if (!may_inc_ap_bio(mdev)) {
3289 /* DRBD has frozen IO */
3295 if (get_ldev(mdev)) {
3296 q = bdev_get_queue(mdev->ldev->backing_bdev);
3297 r = bdi_congested(&q->backing_dev_info, bdi_bits);
3303 if (bdi_bits & (1 << BDI_async_congested) && test_bit(NET_CONGESTED, &mdev->flags)) {
3304 r |= (1 << BDI_async_congested);
3305 reason = reason == 'b' ? 'a' : 'n';
3309 mdev->congestion_reason = reason;
3313 struct drbd_conf *drbd_new_device(unsigned int minor)
3315 struct drbd_conf *mdev;
3316 struct gendisk *disk;
3317 struct request_queue *q;
3319 /* GFP_KERNEL, we are outside of all write-out paths */
3320 mdev = kzalloc(sizeof(struct drbd_conf), GFP_KERNEL);
3323 if (!zalloc_cpumask_var(&mdev->cpu_mask, GFP_KERNEL))
3324 goto out_no_cpumask;
3326 mdev->minor = minor;
3328 drbd_init_set_defaults(mdev);
3330 q = blk_alloc_queue(GFP_KERNEL);
3334 q->queuedata = mdev;
3336 disk = alloc_disk(1);
3341 set_disk_ro(disk, true);
3344 disk->major = DRBD_MAJOR;
3345 disk->first_minor = minor;
3346 disk->fops = &drbd_ops;
3347 sprintf(disk->disk_name, "drbd%d", minor);
3348 disk->private_data = mdev;
3350 mdev->this_bdev = bdget(MKDEV(DRBD_MAJOR, minor));
3351 /* we have no partitions. we contain only ourselves. */
3352 mdev->this_bdev->bd_contains = mdev->this_bdev;
3354 q->backing_dev_info.congested_fn = drbd_congested;
3355 q->backing_dev_info.congested_data = mdev;
3357 blk_queue_make_request(q, drbd_make_request);
3358 blk_queue_max_hw_sectors(q, DRBD_MAX_BIO_SIZE >> 9);
3359 blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
3360 blk_queue_merge_bvec(q, drbd_merge_bvec);
3361 q->queue_lock = &mdev->req_lock;
3363 mdev->md_io_page = alloc_page(GFP_KERNEL);
3364 if (!mdev->md_io_page)
3365 goto out_no_io_page;
3367 if (drbd_bm_init(mdev))
3369 /* no need to lock access, we are still initializing this minor device. */
3373 mdev->app_reads_hash = kzalloc(APP_R_HSIZE*sizeof(void *), GFP_KERNEL);
3374 if (!mdev->app_reads_hash)
3375 goto out_no_app_reads;
3377 mdev->current_epoch = kzalloc(sizeof(struct drbd_epoch), GFP_KERNEL);
3378 if (!mdev->current_epoch)
3381 INIT_LIST_HEAD(&mdev->current_epoch->list);
3386 /* out_whatever_else:
3387 kfree(mdev->current_epoch); */
3389 kfree(mdev->app_reads_hash);
3393 drbd_bm_cleanup(mdev);
3395 __free_page(mdev->md_io_page);
3399 blk_cleanup_queue(q);
3401 free_cpumask_var(mdev->cpu_mask);
3407 /* counterpart of drbd_new_device.
3408 * last part of drbd_delete_device. */
3409 void drbd_free_mdev(struct drbd_conf *mdev)
3411 kfree(mdev->current_epoch);
3412 kfree(mdev->app_reads_hash);
3414 if (mdev->bitmap) /* should no longer be there. */
3415 drbd_bm_cleanup(mdev);
3416 __free_page(mdev->md_io_page);
3417 put_disk(mdev->vdisk);
3418 blk_cleanup_queue(mdev->rq_queue);
3419 free_cpumask_var(mdev->cpu_mask);
3420 drbd_free_tl_hash(mdev);
3425 int __init drbd_init(void)
3429 if (sizeof(struct p_handshake) != 80) {
3431 "drbd: never change the size or layout "
3432 "of the HandShake packet.\n");
3436 if (1 > minor_count || minor_count > 255) {
3438 "drbd: invalid minor_count (%d)\n", minor_count);
3446 err = drbd_nl_init();
3450 err = register_blkdev(DRBD_MAJOR, "drbd");
3453 "drbd: unable to register block device major %d\n",
3458 register_reboot_notifier(&drbd_notifier);
3461 * allocate all necessary structs
3465 init_waitqueue_head(&drbd_pp_wait);
3467 drbd_proc = NULL; /* play safe for drbd_cleanup */
3468 minor_table = kzalloc(sizeof(struct drbd_conf *)*minor_count,
3473 err = drbd_create_mempools();
3477 drbd_proc = proc_create_data("drbd", S_IFREG | S_IRUGO , NULL, &drbd_proc_fops, NULL);
3479 printk(KERN_ERR "drbd: unable to register proc file\n");
3483 rwlock_init(&global_state_lock);
3485 printk(KERN_INFO "drbd: initialized. "
3486 "Version: " REL_VERSION " (api:%d/proto:%d-%d)\n",
3487 API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX);
3488 printk(KERN_INFO "drbd: %s\n", drbd_buildtag());
3489 printk(KERN_INFO "drbd: registered as block device major %d\n",
3491 printk(KERN_INFO "drbd: minor_table @ 0x%p\n", minor_table);
3493 return 0; /* Success! */
3498 /* currently always the case */
3499 printk(KERN_ERR "drbd: ran out of memory\n");
3501 printk(KERN_ERR "drbd: initialization failure\n");
3505 void drbd_free_bc(struct drbd_backing_dev *ldev)
3510 blkdev_put(ldev->backing_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
3511 blkdev_put(ldev->md_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
3516 void drbd_free_sock(struct drbd_conf *mdev)
3518 if (mdev->data.socket) {
3519 mutex_lock(&mdev->data.mutex);
3520 kernel_sock_shutdown(mdev->data.socket, SHUT_RDWR);
3521 sock_release(mdev->data.socket);
3522 mdev->data.socket = NULL;
3523 mutex_unlock(&mdev->data.mutex);
3525 if (mdev->meta.socket) {
3526 mutex_lock(&mdev->meta.mutex);
3527 kernel_sock_shutdown(mdev->meta.socket, SHUT_RDWR);
3528 sock_release(mdev->meta.socket);
3529 mdev->meta.socket = NULL;
3530 mutex_unlock(&mdev->meta.mutex);
3535 void drbd_free_resources(struct drbd_conf *mdev)
3537 crypto_free_hash(mdev->csums_tfm);
3538 mdev->csums_tfm = NULL;
3539 crypto_free_hash(mdev->verify_tfm);
3540 mdev->verify_tfm = NULL;
3541 crypto_free_hash(mdev->cram_hmac_tfm);
3542 mdev->cram_hmac_tfm = NULL;
3543 crypto_free_hash(mdev->integrity_w_tfm);
3544 mdev->integrity_w_tfm = NULL;
3545 crypto_free_hash(mdev->integrity_r_tfm);
3546 mdev->integrity_r_tfm = NULL;
3548 drbd_free_sock(mdev);
3551 drbd_free_bc(mdev->ldev);
3552 mdev->ldev = NULL;);
3555 /* meta data management */
3557 struct meta_data_on_disk {
3558 u64 la_size; /* last agreed size. */
3559 u64 uuid[UI_SIZE]; /* UUIDs. */
3562 u32 flags; /* MDF */
3565 u32 al_offset; /* offset to this block */
3566 u32 al_nr_extents; /* important for restoring the AL */
3567 /* `-- act_log->nr_elements <-- sync_conf.al_extents */
3568 u32 bm_offset; /* offset to the bitmap, from here */
3569 u32 bm_bytes_per_bit; /* BM_BLOCK_SIZE */
3570 u32 reserved_u32[4];
3575 * drbd_md_sync() - Writes the meta data super block if the MD_DIRTY flag bit is set
3576 * @mdev: DRBD device.
3578 void drbd_md_sync(struct drbd_conf *mdev)
3580 struct meta_data_on_disk *buffer;
3584 del_timer(&mdev->md_sync_timer);
3585 /* timer may be rearmed by drbd_md_mark_dirty() now. */
3586 if (!test_and_clear_bit(MD_DIRTY, &mdev->flags))
3589 /* We use here D_FAILED and not D_ATTACHING because we try to write
3590 * metadata even if we detach due to a disk failure! */
3591 if (!get_ldev_if_state(mdev, D_FAILED))
3594 mutex_lock(&mdev->md_io_mutex);
3595 buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);
3596 memset(buffer, 0, 512);
3598 buffer->la_size = cpu_to_be64(drbd_get_capacity(mdev->this_bdev));
3599 for (i = UI_CURRENT; i < UI_SIZE; i++)
3600 buffer->uuid[i] = cpu_to_be64(mdev->ldev->md.uuid[i]);
3601 buffer->flags = cpu_to_be32(mdev->ldev->md.flags);
3602 buffer->magic = cpu_to_be32(DRBD_MD_MAGIC);
3604 buffer->md_size_sect = cpu_to_be32(mdev->ldev->md.md_size_sect);
3605 buffer->al_offset = cpu_to_be32(mdev->ldev->md.al_offset);
3606 buffer->al_nr_extents = cpu_to_be32(mdev->act_log->nr_elements);
3607 buffer->bm_bytes_per_bit = cpu_to_be32(BM_BLOCK_SIZE);
3608 buffer->device_uuid = cpu_to_be64(mdev->ldev->md.device_uuid);
3610 buffer->bm_offset = cpu_to_be32(mdev->ldev->md.bm_offset);
3612 D_ASSERT(drbd_md_ss__(mdev, mdev->ldev) == mdev->ldev->md.md_offset);
3613 sector = mdev->ldev->md.md_offset;
3615 if (!drbd_md_sync_page_io(mdev, mdev->ldev, sector, WRITE)) {
3616 /* this was a try anyways ... */
3617 dev_err(DEV, "meta data update failed!\n");
3618 drbd_chk_io_error(mdev, 1, true);
3621 /* Update mdev->ldev->md.la_size_sect,
3622 * since we updated it on metadata. */
3623 mdev->ldev->md.la_size_sect = drbd_get_capacity(mdev->this_bdev);
3625 mutex_unlock(&mdev->md_io_mutex);
3630 * drbd_md_read() - Reads in the meta data super block
3631 * @mdev: DRBD device.
3632 * @bdev: Device from which the meta data should be read in.
3634 * Return 0 (NO_ERROR) on success, and an enum drbd_ret_code in case
3635 * something goes wrong. Currently only: ERR_IO_MD_DISK, ERR_MD_INVALID.
3637 int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
3639 struct meta_data_on_disk *buffer;
3640 int i, rv = NO_ERROR;
3642 if (!get_ldev_if_state(mdev, D_ATTACHING))
3643 return ERR_IO_MD_DISK;
3645 mutex_lock(&mdev->md_io_mutex);
3646 buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);
3648 if (!drbd_md_sync_page_io(mdev, bdev, bdev->md.md_offset, READ)) {
3649 /* NOTE: cant do normal error processing here as this is
3650 called BEFORE disk is attached */
3651 dev_err(DEV, "Error while reading metadata.\n");
3652 rv = ERR_IO_MD_DISK;
3656 if (be32_to_cpu(buffer->magic) != DRBD_MD_MAGIC) {
3657 dev_err(DEV, "Error while reading metadata, magic not found.\n");
3658 rv = ERR_MD_INVALID;
3661 if (be32_to_cpu(buffer->al_offset) != bdev->md.al_offset) {
3662 dev_err(DEV, "unexpected al_offset: %d (expected %d)\n",
3663 be32_to_cpu(buffer->al_offset), bdev->md.al_offset);
3664 rv = ERR_MD_INVALID;
3667 if (be32_to_cpu(buffer->bm_offset) != bdev->md.bm_offset) {
3668 dev_err(DEV, "unexpected bm_offset: %d (expected %d)\n",
3669 be32_to_cpu(buffer->bm_offset), bdev->md.bm_offset);
3670 rv = ERR_MD_INVALID;
3673 if (be32_to_cpu(buffer->md_size_sect) != bdev->md.md_size_sect) {
3674 dev_err(DEV, "unexpected md_size: %u (expected %u)\n",
3675 be32_to_cpu(buffer->md_size_sect), bdev->md.md_size_sect);
3676 rv = ERR_MD_INVALID;
3680 if (be32_to_cpu(buffer->bm_bytes_per_bit) != BM_BLOCK_SIZE) {
3681 dev_err(DEV, "unexpected bm_bytes_per_bit: %u (expected %u)\n",
3682 be32_to_cpu(buffer->bm_bytes_per_bit), BM_BLOCK_SIZE);
3683 rv = ERR_MD_INVALID;
3687 bdev->md.la_size_sect = be64_to_cpu(buffer->la_size);
3688 for (i = UI_CURRENT; i < UI_SIZE; i++)
3689 bdev->md.uuid[i] = be64_to_cpu(buffer->uuid[i]);
3690 bdev->md.flags = be32_to_cpu(buffer->flags);
3691 mdev->sync_conf.al_extents = be32_to_cpu(buffer->al_nr_extents);
3692 bdev->md.device_uuid = be64_to_cpu(buffer->device_uuid);
3694 if (mdev->sync_conf.al_extents < 7)
3695 mdev->sync_conf.al_extents = 127;
3698 mutex_unlock(&mdev->md_io_mutex);
3704 static void debug_drbd_uuid(struct drbd_conf *mdev, enum drbd_uuid_index index)
3706 static char *uuid_str[UI_EXTENDED_SIZE] = {
3707 [UI_CURRENT] = "CURRENT",
3708 [UI_BITMAP] = "BITMAP",
3709 [UI_HISTORY_START] = "HISTORY_START",
3710 [UI_HISTORY_END] = "HISTORY_END",
3712 [UI_FLAGS] = "FLAGS",
3715 if (index >= UI_EXTENDED_SIZE) {
3716 dev_warn(DEV, " uuid_index >= EXTENDED_SIZE\n");
3720 dynamic_dev_dbg(DEV, " uuid[%s] now %016llX\n",
3722 (unsigned long long)mdev->ldev->md.uuid[index]);
3727 * drbd_md_mark_dirty() - Mark meta data super block as dirty
3728 * @mdev: DRBD device.
3730 * Call this function if you change anything that should be written to
3731 * the meta-data super block. This function sets MD_DIRTY, and starts a
3732 * timer that ensures that within five seconds you have to call drbd_md_sync().
3735 void drbd_md_mark_dirty_(struct drbd_conf *mdev, unsigned int line, const char *func)
3737 if (!test_and_set_bit(MD_DIRTY, &mdev->flags)) {
3738 mod_timer(&mdev->md_sync_timer, jiffies + HZ);
3739 mdev->last_md_mark_dirty.line = line;
3740 mdev->last_md_mark_dirty.func = func;
3744 void drbd_md_mark_dirty(struct drbd_conf *mdev)
3746 if (!test_and_set_bit(MD_DIRTY, &mdev->flags))
3747 mod_timer(&mdev->md_sync_timer, jiffies + 5*HZ);
3751 static void drbd_uuid_move_history(struct drbd_conf *mdev) __must_hold(local)
3755 for (i = UI_HISTORY_START; i < UI_HISTORY_END; i++) {
3756 mdev->ldev->md.uuid[i+1] = mdev->ldev->md.uuid[i];
3757 debug_drbd_uuid(mdev, i+1);
3761 void _drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local)
3763 if (idx == UI_CURRENT) {
3764 if (mdev->state.role == R_PRIMARY)
3769 drbd_set_ed_uuid(mdev, val);
3772 mdev->ldev->md.uuid[idx] = val;
3773 debug_drbd_uuid(mdev, idx);
3774 drbd_md_mark_dirty(mdev);
3778 void drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local)
3780 if (mdev->ldev->md.uuid[idx]) {
3781 drbd_uuid_move_history(mdev);
3782 mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[idx];
3783 debug_drbd_uuid(mdev, UI_HISTORY_START);
3785 _drbd_uuid_set(mdev, idx, val);
3789 * drbd_uuid_new_current() - Creates a new current UUID
3790 * @mdev: DRBD device.
3792 * Creates a new current UUID, and rotates the old current UUID into
3793 * the bitmap slot. Causes an incremental resync upon next connect.
3795 void drbd_uuid_new_current(struct drbd_conf *mdev) __must_hold(local)
3799 dev_info(DEV, "Creating new current UUID\n");
3800 D_ASSERT(mdev->ldev->md.uuid[UI_BITMAP] == 0);
3801 mdev->ldev->md.uuid[UI_BITMAP] = mdev->ldev->md.uuid[UI_CURRENT];
3802 debug_drbd_uuid(mdev, UI_BITMAP);
3804 get_random_bytes(&val, sizeof(u64));
3805 _drbd_uuid_set(mdev, UI_CURRENT, val);
3806 /* get it to stable storage _now_ */
3810 void drbd_uuid_set_bm(struct drbd_conf *mdev, u64 val) __must_hold(local)
3812 if (mdev->ldev->md.uuid[UI_BITMAP] == 0 && val == 0)
3816 drbd_uuid_move_history(mdev);
3817 mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[UI_BITMAP];
3818 mdev->ldev->md.uuid[UI_BITMAP] = 0;
3819 debug_drbd_uuid(mdev, UI_HISTORY_START);
3820 debug_drbd_uuid(mdev, UI_BITMAP);
3822 if (mdev->ldev->md.uuid[UI_BITMAP])
3823 dev_warn(DEV, "bm UUID already set");
3825 mdev->ldev->md.uuid[UI_BITMAP] = val;
3826 mdev->ldev->md.uuid[UI_BITMAP] &= ~((u64)1);
3828 debug_drbd_uuid(mdev, UI_BITMAP);
3830 drbd_md_mark_dirty(mdev);
3834 * drbd_bmio_set_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
3835 * @mdev: DRBD device.
3837 * Sets all bits in the bitmap and writes the whole bitmap to stable storage.
3839 int drbd_bmio_set_n_write(struct drbd_conf *mdev)
3843 if (get_ldev_if_state(mdev, D_ATTACHING)) {
3844 drbd_md_set_flag(mdev, MDF_FULL_SYNC);
3846 drbd_bm_set_all(mdev);
3848 rv = drbd_bm_write(mdev);
3851 drbd_md_clear_flag(mdev, MDF_FULL_SYNC);
3862 * drbd_bmio_clear_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
3863 * @mdev: DRBD device.
3865 * Clears all bits in the bitmap and writes the whole bitmap to stable storage.
3867 int drbd_bmio_clear_n_write(struct drbd_conf *mdev)
3871 drbd_resume_al(mdev);
3872 if (get_ldev_if_state(mdev, D_ATTACHING)) {
3873 drbd_bm_clear_all(mdev);
3874 rv = drbd_bm_write(mdev);
3881 static int w_bitmap_io(struct drbd_conf *mdev, struct drbd_work *w, int unused)
3883 struct bm_io_work *work = container_of(w, struct bm_io_work, w);
3886 D_ASSERT(atomic_read(&mdev->ap_bio_cnt) == 0);
3888 if (get_ldev(mdev)) {
3889 drbd_bm_lock(mdev, work->why);
3890 rv = work->io_fn(mdev);
3891 drbd_bm_unlock(mdev);
3895 clear_bit(BITMAP_IO, &mdev->flags);
3896 smp_mb__after_clear_bit();
3897 wake_up(&mdev->misc_wait);
3900 work->done(mdev, rv);
3902 clear_bit(BITMAP_IO_QUEUED, &mdev->flags);
3908 void drbd_ldev_destroy(struct drbd_conf *mdev)
3910 lc_destroy(mdev->resync);
3911 mdev->resync = NULL;
3912 lc_destroy(mdev->act_log);
3913 mdev->act_log = NULL;
3915 drbd_free_bc(mdev->ldev);
3916 mdev->ldev = NULL;);
3918 if (mdev->md_io_tmpp) {
3919 __free_page(mdev->md_io_tmpp);
3920 mdev->md_io_tmpp = NULL;
3922 clear_bit(GO_DISKLESS, &mdev->flags);
3925 static int w_go_diskless(struct drbd_conf *mdev, struct drbd_work *w, int unused)
3927 D_ASSERT(mdev->state.disk == D_FAILED);
3928 /* we cannot assert local_cnt == 0 here, as get_ldev_if_state will
3929 * inc/dec it frequently. Once we are D_DISKLESS, no one will touch
3930 * the protected members anymore, though, so once put_ldev reaches zero
3931 * again, it will be safe to free them. */
3932 drbd_force_state(mdev, NS(disk, D_DISKLESS));
3936 void drbd_go_diskless(struct drbd_conf *mdev)
3938 D_ASSERT(mdev->state.disk == D_FAILED);
3939 if (!test_and_set_bit(GO_DISKLESS, &mdev->flags))
3940 drbd_queue_work(&mdev->data.work, &mdev->go_diskless);
3944 * drbd_queue_bitmap_io() - Queues an IO operation on the whole bitmap
3945 * @mdev: DRBD device.
3946 * @io_fn: IO callback to be called when bitmap IO is possible
3947 * @done: callback to be called after the bitmap IO was performed
3948 * @why: Descriptive text of the reason for doing the IO
3950 * While IO on the bitmap happens we freeze application IO thus we ensure
3951 * that drbd_set_out_of_sync() can not be called. This function MAY ONLY be
3952 * called from worker context. It MUST NOT be used while a previous such
3953 * work is still pending!
3955 void drbd_queue_bitmap_io(struct drbd_conf *mdev,
3956 int (*io_fn)(struct drbd_conf *),
3957 void (*done)(struct drbd_conf *, int),
3960 D_ASSERT(current == mdev->worker.task);
3962 D_ASSERT(!test_bit(BITMAP_IO_QUEUED, &mdev->flags));
3963 D_ASSERT(!test_bit(BITMAP_IO, &mdev->flags));
3964 D_ASSERT(list_empty(&mdev->bm_io_work.w.list));
3965 if (mdev->bm_io_work.why)
3966 dev_err(DEV, "FIXME going to queue '%s' but '%s' still pending?\n",
3967 why, mdev->bm_io_work.why);
3969 mdev->bm_io_work.io_fn = io_fn;
3970 mdev->bm_io_work.done = done;
3971 mdev->bm_io_work.why = why;
3973 spin_lock_irq(&mdev->req_lock);
3974 set_bit(BITMAP_IO, &mdev->flags);
3975 if (atomic_read(&mdev->ap_bio_cnt) == 0) {
3976 if (!test_and_set_bit(BITMAP_IO_QUEUED, &mdev->flags))
3977 drbd_queue_work(&mdev->data.work, &mdev->bm_io_work.w);
3979 spin_unlock_irq(&mdev->req_lock);
3983 * drbd_bitmap_io() - Does an IO operation on the whole bitmap
3984 * @mdev: DRBD device.
3985 * @io_fn: IO callback to be called when bitmap IO is possible
3986 * @why: Descriptive text of the reason for doing the IO
3988 * freezes application IO while that the actual IO operations runs. This
3989 * functions MAY NOT be called from worker context.
3991 int drbd_bitmap_io(struct drbd_conf *mdev, int (*io_fn)(struct drbd_conf *), char *why)
3995 D_ASSERT(current != mdev->worker.task);
3997 drbd_suspend_io(mdev);
3999 drbd_bm_lock(mdev, why);
4001 drbd_bm_unlock(mdev);
4003 drbd_resume_io(mdev);
4008 void drbd_md_set_flag(struct drbd_conf *mdev, int flag) __must_hold(local)
4010 if ((mdev->ldev->md.flags & flag) != flag) {
4011 drbd_md_mark_dirty(mdev);
4012 mdev->ldev->md.flags |= flag;
4016 void drbd_md_clear_flag(struct drbd_conf *mdev, int flag) __must_hold(local)
4018 if ((mdev->ldev->md.flags & flag) != 0) {
4019 drbd_md_mark_dirty(mdev);
4020 mdev->ldev->md.flags &= ~flag;
4023 int drbd_md_test_flag(struct drbd_backing_dev *bdev, int flag)
4025 return (bdev->md.flags & flag) != 0;
4028 static void md_sync_timer_fn(unsigned long data)
4030 struct drbd_conf *mdev = (struct drbd_conf *) data;
4032 drbd_queue_work_front(&mdev->data.work, &mdev->md_sync_work);
4035 static int w_md_sync(struct drbd_conf *mdev, struct drbd_work *w, int unused)
4037 dev_warn(DEV, "md_sync_timer expired! Worker calls drbd_md_sync().\n");
4039 dev_warn(DEV, "last md_mark_dirty: %s:%u\n",
4040 mdev->last_md_mark_dirty.func, mdev->last_md_mark_dirty.line);
4046 #ifdef CONFIG_DRBD_FAULT_INJECTION
4047 /* Fault insertion support including random number generator shamelessly
4048 * stolen from kernel/rcutorture.c */
4049 struct fault_random_state {
4050 unsigned long state;
4051 unsigned long count;
4054 #define FAULT_RANDOM_MULT 39916801 /* prime */
4055 #define FAULT_RANDOM_ADD 479001701 /* prime */
4056 #define FAULT_RANDOM_REFRESH 10000
4059 * Crude but fast random-number generator. Uses a linear congruential
4060 * generator, with occasional help from get_random_bytes().
4062 static unsigned long
4063 _drbd_fault_random(struct fault_random_state *rsp)
4067 if (!rsp->count--) {
4068 get_random_bytes(&refresh, sizeof(refresh));
4069 rsp->state += refresh;
4070 rsp->count = FAULT_RANDOM_REFRESH;
4072 rsp->state = rsp->state * FAULT_RANDOM_MULT + FAULT_RANDOM_ADD;
4073 return swahw32(rsp->state);
4077 _drbd_fault_str(unsigned int type) {
4078 static char *_faults[] = {
4079 [DRBD_FAULT_MD_WR] = "Meta-data write",
4080 [DRBD_FAULT_MD_RD] = "Meta-data read",
4081 [DRBD_FAULT_RS_WR] = "Resync write",
4082 [DRBD_FAULT_RS_RD] = "Resync read",
4083 [DRBD_FAULT_DT_WR] = "Data write",
4084 [DRBD_FAULT_DT_RD] = "Data read",
4085 [DRBD_FAULT_DT_RA] = "Data read ahead",
4086 [DRBD_FAULT_BM_ALLOC] = "BM allocation",
4087 [DRBD_FAULT_AL_EE] = "EE allocation",
4088 [DRBD_FAULT_RECEIVE] = "receive data corruption",
4091 return (type < DRBD_FAULT_MAX) ? _faults[type] : "**Unknown**";
4095 _drbd_insert_fault(struct drbd_conf *mdev, unsigned int type)
4097 static struct fault_random_state rrs = {0, 0};
4099 unsigned int ret = (
4101 ((1 << mdev_to_minor(mdev)) & fault_devs) != 0) &&
4102 (((_drbd_fault_random(&rrs) % 100) + 1) <= fault_rate));
4107 if (__ratelimit(&drbd_ratelimit_state))
4108 dev_warn(DEV, "***Simulating %s failure\n",
4109 _drbd_fault_str(type));
4116 const char *drbd_buildtag(void)
4118 /* DRBD built from external sources has here a reference to the
4119 git hash of the source code. */
4121 static char buildtag[38] = "\0uilt-in";
4123 if (buildtag[0] == 0) {
4124 #ifdef CONFIG_MODULES
4125 if (THIS_MODULE != NULL)
4126 sprintf(buildtag, "srcversion: %-24s", THIS_MODULE->srcversion);
4135 module_init(drbd_init)
4136 module_exit(drbd_cleanup)
4138 EXPORT_SYMBOL(drbd_conn_str);
4139 EXPORT_SYMBOL(drbd_role_str);
4140 EXPORT_SYMBOL(drbd_disk_str);
4141 EXPORT_SYMBOL(drbd_set_st_err_str);