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);
1293 * after_state_ch() - Perform after state change actions that may sleep
1294 * @mdev: DRBD device.
1299 static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
1300 union drbd_state ns, enum chg_state_flags flags)
1302 enum drbd_fencing_p fp;
1303 enum drbd_req_event what = nothing;
1304 union drbd_state nsm = (union drbd_state){ .i = -1 };
1306 if (os.conn != C_CONNECTED && ns.conn == C_CONNECTED) {
1307 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1309 mdev->p_uuid[UI_FLAGS] &= ~((u64)2);
1313 if (get_ldev(mdev)) {
1314 fp = mdev->ldev->dc.fencing;
1318 /* Inform userspace about the change... */
1319 drbd_bcast_state(mdev, ns);
1321 if (!(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE) &&
1322 (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE))
1323 drbd_khelper(mdev, "pri-on-incon-degr");
1325 /* Here we have the actions that are performed after a
1326 state change. This function might sleep */
1330 if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) {
1331 if (ns.conn == C_CONNECTED)
1332 what = resend, nsm.susp_nod = 0;
1333 else /* ns.conn > C_CONNECTED */
1334 dev_err(DEV, "Unexpected Resynd going on!\n");
1337 if (os.disk == D_ATTACHING && ns.disk > D_ATTACHING)
1338 what = restart_frozen_disk_io, nsm.susp_nod = 0;
1343 /* case1: The outdate peer handler is successful: */
1344 if (os.pdsk > D_OUTDATED && ns.pdsk <= D_OUTDATED) {
1346 if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
1347 drbd_uuid_new_current(mdev);
1348 clear_bit(NEW_CUR_UUID, &mdev->flags);
1350 spin_lock_irq(&mdev->req_lock);
1351 _drbd_set_state(_NS(mdev, susp_fen, 0), CS_VERBOSE, NULL);
1352 spin_unlock_irq(&mdev->req_lock);
1354 /* case2: The connection was established again: */
1355 if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) {
1356 clear_bit(NEW_CUR_UUID, &mdev->flags);
1362 if (what != nothing) {
1363 spin_lock_irq(&mdev->req_lock);
1364 _tl_restart(mdev, what);
1365 nsm.i &= mdev->state.i;
1366 _drbd_set_state(mdev, nsm, CS_VERBOSE, NULL);
1367 spin_unlock_irq(&mdev->req_lock);
1370 /* Do not change the order of the if above and the two below... */
1371 if (os.pdsk == D_DISKLESS && ns.pdsk > D_DISKLESS) { /* attach on the peer */
1372 drbd_send_uuids(mdev);
1373 drbd_send_state(mdev);
1375 if (os.conn != C_WF_BITMAP_S && ns.conn == C_WF_BITMAP_S)
1376 drbd_queue_bitmap_io(mdev, &drbd_send_bitmap, NULL, "send_bitmap (WFBitMapS)");
1378 /* Lost contact to peer's copy of the data */
1379 if ((os.pdsk >= D_INCONSISTENT &&
1380 os.pdsk != D_UNKNOWN &&
1381 os.pdsk != D_OUTDATED)
1382 && (ns.pdsk < D_INCONSISTENT ||
1383 ns.pdsk == D_UNKNOWN ||
1384 ns.pdsk == D_OUTDATED)) {
1385 if (get_ldev(mdev)) {
1386 if ((ns.role == R_PRIMARY || ns.peer == R_PRIMARY) &&
1387 mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) {
1388 if (is_susp(mdev->state)) {
1389 set_bit(NEW_CUR_UUID, &mdev->flags);
1391 drbd_uuid_new_current(mdev);
1392 drbd_send_uuids(mdev);
1399 if (ns.pdsk < D_INCONSISTENT && get_ldev(mdev)) {
1400 if (ns.peer == R_PRIMARY && mdev->ldev->md.uuid[UI_BITMAP] == 0) {
1401 drbd_uuid_new_current(mdev);
1402 drbd_send_uuids(mdev);
1405 /* D_DISKLESS Peer becomes secondary */
1406 if (os.peer == R_PRIMARY && ns.peer == R_SECONDARY)
1407 drbd_al_to_on_disk_bm(mdev);
1411 /* Last part of the attaching process ... */
1412 if (ns.conn >= C_CONNECTED &&
1413 os.disk == D_ATTACHING && ns.disk == D_NEGOTIATING) {
1414 drbd_send_sizes(mdev, 0, 0); /* to start sync... */
1415 drbd_send_uuids(mdev);
1416 drbd_send_state(mdev);
1419 /* We want to pause/continue resync, tell peer. */
1420 if (ns.conn >= C_CONNECTED &&
1421 ((os.aftr_isp != ns.aftr_isp) ||
1422 (os.user_isp != ns.user_isp)))
1423 drbd_send_state(mdev);
1425 /* In case one of the isp bits got set, suspend other devices. */
1426 if ((!os.aftr_isp && !os.peer_isp && !os.user_isp) &&
1427 (ns.aftr_isp || ns.peer_isp || ns.user_isp))
1428 suspend_other_sg(mdev);
1430 /* Make sure the peer gets informed about eventual state
1431 changes (ISP bits) while we were in WFReportParams. */
1432 if (os.conn == C_WF_REPORT_PARAMS && ns.conn >= C_CONNECTED)
1433 drbd_send_state(mdev);
1435 if (os.conn != C_AHEAD && ns.conn == C_AHEAD)
1436 drbd_send_state(mdev);
1438 /* We are in the progress to start a full sync... */
1439 if ((os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) ||
1440 (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S))
1441 drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, &abw_start_sync, "set_n_write from StartingSync");
1443 /* We are invalidating our self... */
1444 if (os.conn < C_CONNECTED && ns.conn < C_CONNECTED &&
1445 os.disk > D_INCONSISTENT && ns.disk == D_INCONSISTENT)
1446 drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, NULL, "set_n_write from invalidate");
1448 /* first half of local IO error, failure to attach,
1449 * or administrative detach */
1450 if (os.disk != D_FAILED && ns.disk == D_FAILED) {
1451 enum drbd_io_error_p eh;
1453 /* corresponding get_ldev was in __drbd_set_state, to serialize
1454 * our cleanup here with the transition to D_DISKLESS,
1455 * so it is safe to dreference ldev here. */
1456 eh = mdev->ldev->dc.on_io_error;
1457 was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags);
1459 /* current state still has to be D_FAILED,
1460 * there is only one way out: to D_DISKLESS,
1461 * and that may only happen after our put_ldev below. */
1462 if (mdev->state.disk != D_FAILED)
1464 "ASSERT FAILED: disk is %s during detach\n",
1465 drbd_disk_str(mdev->state.disk));
1467 if (drbd_send_state(mdev))
1468 dev_warn(DEV, "Notified peer that I am detaching my disk\n");
1470 dev_err(DEV, "Sending state for detaching disk failed\n");
1472 drbd_rs_cancel_all(mdev);
1474 /* In case we want to get something to stable storage still,
1475 * this may be the last chance.
1476 * Following put_ldev may transition to D_DISKLESS. */
1480 if (was_io_error && eh == EP_CALL_HELPER)
1481 drbd_khelper(mdev, "local-io-error");
1484 /* second half of local IO error, failure to attach,
1485 * or administrative detach,
1486 * after local_cnt references have reached zero again */
1487 if (os.disk != D_DISKLESS && ns.disk == D_DISKLESS) {
1488 /* We must still be diskless,
1489 * re-attach has to be serialized with this! */
1490 if (mdev->state.disk != D_DISKLESS)
1492 "ASSERT FAILED: disk is %s while going diskless\n",
1493 drbd_disk_str(mdev->state.disk));
1496 mdev->rs_failed = 0;
1497 atomic_set(&mdev->rs_pending_cnt, 0);
1499 if (drbd_send_state(mdev))
1500 dev_warn(DEV, "Notified peer that I'm now diskless.\n");
1502 dev_err(DEV, "Sending state for being diskless failed\n");
1503 /* corresponding get_ldev in __drbd_set_state
1504 * this may finaly trigger drbd_ldev_destroy. */
1508 /* Disks got bigger while they were detached */
1509 if (ns.disk > D_NEGOTIATING && ns.pdsk > D_NEGOTIATING &&
1510 test_and_clear_bit(RESYNC_AFTER_NEG, &mdev->flags)) {
1511 if (ns.conn == C_CONNECTED)
1512 resync_after_online_grow(mdev);
1515 /* A resync finished or aborted, wake paused devices... */
1516 if ((os.conn > C_CONNECTED && ns.conn <= C_CONNECTED) ||
1517 (os.peer_isp && !ns.peer_isp) ||
1518 (os.user_isp && !ns.user_isp))
1519 resume_next_sg(mdev);
1521 /* sync target done with resync. Explicitly notify peer, even though
1522 * it should (at least for non-empty resyncs) already know itself. */
1523 if (os.disk < D_UP_TO_DATE && os.conn >= C_SYNC_SOURCE && ns.conn == C_CONNECTED)
1524 drbd_send_state(mdev);
1526 /* free tl_hash if we Got thawed and are C_STANDALONE */
1527 if (ns.conn == C_STANDALONE && !is_susp(ns) && mdev->tl_hash)
1528 drbd_free_tl_hash(mdev);
1530 /* Upon network connection, we need to start the receiver */
1531 if (os.conn == C_STANDALONE && ns.conn == C_UNCONNECTED)
1532 drbd_thread_start(&mdev->receiver);
1534 /* Terminate worker thread if we are unconfigured - it will be
1535 restarted as needed... */
1536 if (ns.disk == D_DISKLESS &&
1537 ns.conn == C_STANDALONE &&
1538 ns.role == R_SECONDARY) {
1539 if (os.aftr_isp != ns.aftr_isp)
1540 resume_next_sg(mdev);
1541 /* set in __drbd_set_state, unless CONFIG_PENDING was set */
1542 if (test_bit(DEVICE_DYING, &mdev->flags))
1543 drbd_thread_stop_nowait(&mdev->worker);
1550 static int drbd_thread_setup(void *arg)
1552 struct drbd_thread *thi = (struct drbd_thread *) arg;
1553 struct drbd_conf *mdev = thi->mdev;
1554 unsigned long flags;
1558 retval = thi->function(thi);
1560 spin_lock_irqsave(&thi->t_lock, flags);
1562 /* if the receiver has been "Exiting", the last thing it did
1563 * was set the conn state to "StandAlone",
1564 * if now a re-connect request comes in, conn state goes C_UNCONNECTED,
1565 * and receiver thread will be "started".
1566 * drbd_thread_start needs to set "Restarting" in that case.
1567 * t_state check and assignment needs to be within the same spinlock,
1568 * so either thread_start sees Exiting, and can remap to Restarting,
1569 * or thread_start see None, and can proceed as normal.
1572 if (thi->t_state == Restarting) {
1573 dev_info(DEV, "Restarting %s\n", current->comm);
1574 thi->t_state = Running;
1575 spin_unlock_irqrestore(&thi->t_lock, flags);
1580 thi->t_state = None;
1582 complete(&thi->stop);
1583 spin_unlock_irqrestore(&thi->t_lock, flags);
1585 dev_info(DEV, "Terminating %s\n", current->comm);
1587 /* Release mod reference taken when thread was started */
1588 module_put(THIS_MODULE);
1592 static void drbd_thread_init(struct drbd_conf *mdev, struct drbd_thread *thi,
1593 int (*func) (struct drbd_thread *))
1595 spin_lock_init(&thi->t_lock);
1597 thi->t_state = None;
1598 thi->function = func;
1602 int drbd_thread_start(struct drbd_thread *thi)
1604 struct drbd_conf *mdev = thi->mdev;
1605 struct task_struct *nt;
1606 unsigned long flags;
1609 thi == &mdev->receiver ? "receiver" :
1610 thi == &mdev->asender ? "asender" :
1611 thi == &mdev->worker ? "worker" : "NONSENSE";
1613 /* is used from state engine doing drbd_thread_stop_nowait,
1614 * while holding the req lock irqsave */
1615 spin_lock_irqsave(&thi->t_lock, flags);
1617 switch (thi->t_state) {
1619 dev_info(DEV, "Starting %s thread (from %s [%d])\n",
1620 me, current->comm, current->pid);
1622 /* Get ref on module for thread - this is released when thread exits */
1623 if (!try_module_get(THIS_MODULE)) {
1624 dev_err(DEV, "Failed to get module reference in drbd_thread_start\n");
1625 spin_unlock_irqrestore(&thi->t_lock, flags);
1629 init_completion(&thi->stop);
1630 D_ASSERT(thi->task == NULL);
1631 thi->reset_cpu_mask = 1;
1632 thi->t_state = Running;
1633 spin_unlock_irqrestore(&thi->t_lock, flags);
1634 flush_signals(current); /* otherw. may get -ERESTARTNOINTR */
1636 nt = kthread_create(drbd_thread_setup, (void *) thi,
1637 "drbd%d_%s", mdev_to_minor(mdev), me);
1640 dev_err(DEV, "Couldn't start thread\n");
1642 module_put(THIS_MODULE);
1645 spin_lock_irqsave(&thi->t_lock, flags);
1647 thi->t_state = Running;
1648 spin_unlock_irqrestore(&thi->t_lock, flags);
1649 wake_up_process(nt);
1652 thi->t_state = Restarting;
1653 dev_info(DEV, "Restarting %s thread (from %s [%d])\n",
1654 me, current->comm, current->pid);
1659 spin_unlock_irqrestore(&thi->t_lock, flags);
1667 void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait)
1669 unsigned long flags;
1671 enum drbd_thread_state ns = restart ? Restarting : Exiting;
1673 /* may be called from state engine, holding the req lock irqsave */
1674 spin_lock_irqsave(&thi->t_lock, flags);
1676 if (thi->t_state == None) {
1677 spin_unlock_irqrestore(&thi->t_lock, flags);
1679 drbd_thread_start(thi);
1683 if (thi->t_state != ns) {
1684 if (thi->task == NULL) {
1685 spin_unlock_irqrestore(&thi->t_lock, flags);
1691 init_completion(&thi->stop);
1692 if (thi->task != current)
1693 force_sig(DRBD_SIGKILL, thi->task);
1697 spin_unlock_irqrestore(&thi->t_lock, flags);
1700 wait_for_completion(&thi->stop);
1705 * drbd_calc_cpu_mask() - Generate CPU masks, spread over all CPUs
1706 * @mdev: DRBD device.
1708 * Forces all threads of a device onto the same CPU. This is beneficial for
1709 * DRBD's performance. May be overwritten by user's configuration.
1711 void drbd_calc_cpu_mask(struct drbd_conf *mdev)
1715 /* user override. */
1716 if (cpumask_weight(mdev->cpu_mask))
1719 ord = mdev_to_minor(mdev) % cpumask_weight(cpu_online_mask);
1720 for_each_online_cpu(cpu) {
1722 cpumask_set_cpu(cpu, mdev->cpu_mask);
1726 /* should not be reached */
1727 cpumask_setall(mdev->cpu_mask);
1731 * drbd_thread_current_set_cpu() - modifies the cpu mask of the _current_ thread
1732 * @mdev: DRBD device.
1734 * call in the "main loop" of _all_ threads, no need for any mutex, current won't die
1737 void drbd_thread_current_set_cpu(struct drbd_conf *mdev)
1739 struct task_struct *p = current;
1740 struct drbd_thread *thi =
1741 p == mdev->asender.task ? &mdev->asender :
1742 p == mdev->receiver.task ? &mdev->receiver :
1743 p == mdev->worker.task ? &mdev->worker :
1747 if (!thi->reset_cpu_mask)
1749 thi->reset_cpu_mask = 0;
1750 set_cpus_allowed_ptr(p, mdev->cpu_mask);
1754 /* the appropriate socket mutex must be held already */
1755 int _drbd_send_cmd(struct drbd_conf *mdev, struct socket *sock,
1756 enum drbd_packets cmd, struct p_header80 *h,
1757 size_t size, unsigned msg_flags)
1761 ERR_IF(!h) return false;
1762 ERR_IF(!size) return false;
1764 h->magic = BE_DRBD_MAGIC;
1765 h->command = cpu_to_be16(cmd);
1766 h->length = cpu_to_be16(size-sizeof(struct p_header80));
1768 sent = drbd_send(mdev, sock, h, size, msg_flags);
1770 ok = (sent == size);
1772 dev_err(DEV, "short sent %s size=%d sent=%d\n",
1773 cmdname(cmd), (int)size, sent);
1777 /* don't pass the socket. we may only look at it
1778 * when we hold the appropriate socket mutex.
1780 int drbd_send_cmd(struct drbd_conf *mdev, int use_data_socket,
1781 enum drbd_packets cmd, struct p_header80 *h, size_t size)
1784 struct socket *sock;
1786 if (use_data_socket) {
1787 mutex_lock(&mdev->data.mutex);
1788 sock = mdev->data.socket;
1790 mutex_lock(&mdev->meta.mutex);
1791 sock = mdev->meta.socket;
1794 /* drbd_disconnect() could have called drbd_free_sock()
1795 * while we were waiting in down()... */
1796 if (likely(sock != NULL))
1797 ok = _drbd_send_cmd(mdev, sock, cmd, h, size, 0);
1799 if (use_data_socket)
1800 mutex_unlock(&mdev->data.mutex);
1802 mutex_unlock(&mdev->meta.mutex);
1806 int drbd_send_cmd2(struct drbd_conf *mdev, enum drbd_packets cmd, char *data,
1809 struct p_header80 h;
1812 h.magic = BE_DRBD_MAGIC;
1813 h.command = cpu_to_be16(cmd);
1814 h.length = cpu_to_be16(size);
1816 if (!drbd_get_data_sock(mdev))
1820 drbd_send(mdev, mdev->data.socket, &h, sizeof(h), 0));
1822 drbd_send(mdev, mdev->data.socket, data, size, 0));
1824 drbd_put_data_sock(mdev);
1829 int drbd_send_sync_param(struct drbd_conf *mdev, struct syncer_conf *sc)
1831 struct p_rs_param_95 *p;
1832 struct socket *sock;
1834 const int apv = mdev->agreed_pro_version;
1836 size = apv <= 87 ? sizeof(struct p_rs_param)
1837 : apv == 88 ? sizeof(struct p_rs_param)
1838 + strlen(mdev->sync_conf.verify_alg) + 1
1839 : apv <= 94 ? sizeof(struct p_rs_param_89)
1840 : /* apv >= 95 */ sizeof(struct p_rs_param_95);
1842 /* used from admin command context and receiver/worker context.
1843 * to avoid kmalloc, grab the socket right here,
1844 * then use the pre-allocated sbuf there */
1845 mutex_lock(&mdev->data.mutex);
1846 sock = mdev->data.socket;
1848 if (likely(sock != NULL)) {
1849 enum drbd_packets cmd = apv >= 89 ? P_SYNC_PARAM89 : P_SYNC_PARAM;
1851 p = &mdev->data.sbuf.rs_param_95;
1853 /* initialize verify_alg and csums_alg */
1854 memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX);
1856 p->rate = cpu_to_be32(sc->rate);
1857 p->c_plan_ahead = cpu_to_be32(sc->c_plan_ahead);
1858 p->c_delay_target = cpu_to_be32(sc->c_delay_target);
1859 p->c_fill_target = cpu_to_be32(sc->c_fill_target);
1860 p->c_max_rate = cpu_to_be32(sc->c_max_rate);
1863 strcpy(p->verify_alg, mdev->sync_conf.verify_alg);
1865 strcpy(p->csums_alg, mdev->sync_conf.csums_alg);
1867 rv = _drbd_send_cmd(mdev, sock, cmd, &p->head, size, 0);
1869 rv = 0; /* not ok */
1871 mutex_unlock(&mdev->data.mutex);
1876 int drbd_send_protocol(struct drbd_conf *mdev)
1878 struct p_protocol *p;
1881 size = sizeof(struct p_protocol);
1883 if (mdev->agreed_pro_version >= 87)
1884 size += strlen(mdev->net_conf->integrity_alg) + 1;
1886 /* we must not recurse into our own queue,
1887 * as that is blocked during handshake */
1888 p = kmalloc(size, GFP_NOIO);
1892 p->protocol = cpu_to_be32(mdev->net_conf->wire_protocol);
1893 p->after_sb_0p = cpu_to_be32(mdev->net_conf->after_sb_0p);
1894 p->after_sb_1p = cpu_to_be32(mdev->net_conf->after_sb_1p);
1895 p->after_sb_2p = cpu_to_be32(mdev->net_conf->after_sb_2p);
1896 p->two_primaries = cpu_to_be32(mdev->net_conf->two_primaries);
1899 if (mdev->net_conf->want_lose)
1901 if (mdev->net_conf->dry_run) {
1902 if (mdev->agreed_pro_version >= 92)
1905 dev_err(DEV, "--dry-run is not supported by peer");
1910 p->conn_flags = cpu_to_be32(cf);
1912 if (mdev->agreed_pro_version >= 87)
1913 strcpy(p->integrity_alg, mdev->net_conf->integrity_alg);
1915 rv = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_PROTOCOL,
1916 (struct p_header80 *)p, size);
1921 int _drbd_send_uuids(struct drbd_conf *mdev, u64 uuid_flags)
1926 if (!get_ldev_if_state(mdev, D_NEGOTIATING))
1929 for (i = UI_CURRENT; i < UI_SIZE; i++)
1930 p.uuid[i] = mdev->ldev ? cpu_to_be64(mdev->ldev->md.uuid[i]) : 0;
1932 mdev->comm_bm_set = drbd_bm_total_weight(mdev);
1933 p.uuid[UI_SIZE] = cpu_to_be64(mdev->comm_bm_set);
1934 uuid_flags |= mdev->net_conf->want_lose ? 1 : 0;
1935 uuid_flags |= test_bit(CRASHED_PRIMARY, &mdev->flags) ? 2 : 0;
1936 uuid_flags |= mdev->new_state_tmp.disk == D_INCONSISTENT ? 4 : 0;
1937 p.uuid[UI_FLAGS] = cpu_to_be64(uuid_flags);
1941 return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_UUIDS,
1942 (struct p_header80 *)&p, sizeof(p));
1945 int drbd_send_uuids(struct drbd_conf *mdev)
1947 return _drbd_send_uuids(mdev, 0);
1950 int drbd_send_uuids_skip_initial_sync(struct drbd_conf *mdev)
1952 return _drbd_send_uuids(mdev, 8);
1956 int drbd_send_sync_uuid(struct drbd_conf *mdev, u64 val)
1960 p.uuid = cpu_to_be64(val);
1962 return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_SYNC_UUID,
1963 (struct p_header80 *)&p, sizeof(p));
1966 int drbd_send_sizes(struct drbd_conf *mdev, int trigger_reply, enum dds_flags flags)
1969 sector_t d_size, u_size;
1973 if (get_ldev_if_state(mdev, D_NEGOTIATING)) {
1974 D_ASSERT(mdev->ldev->backing_bdev);
1975 d_size = drbd_get_max_capacity(mdev->ldev);
1976 u_size = mdev->ldev->dc.disk_size;
1977 q_order_type = drbd_queue_order_type(mdev);
1982 q_order_type = QUEUE_ORDERED_NONE;
1985 p.d_size = cpu_to_be64(d_size);
1986 p.u_size = cpu_to_be64(u_size);
1987 p.c_size = cpu_to_be64(trigger_reply ? 0 : drbd_get_capacity(mdev->this_bdev));
1988 p.max_bio_size = cpu_to_be32(queue_max_hw_sectors(mdev->rq_queue) << 9);
1989 p.queue_order_type = cpu_to_be16(q_order_type);
1990 p.dds_flags = cpu_to_be16(flags);
1992 ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_SIZES,
1993 (struct p_header80 *)&p, sizeof(p));
1998 * drbd_send_state() - Sends the drbd state to the peer
1999 * @mdev: DRBD device.
2001 int drbd_send_state(struct drbd_conf *mdev)
2003 struct socket *sock;
2007 /* Grab state lock so we wont send state if we're in the middle
2008 * of a cluster wide state change on another thread */
2009 drbd_state_lock(mdev);
2011 mutex_lock(&mdev->data.mutex);
2013 p.state = cpu_to_be32(mdev->state.i); /* Within the send mutex */
2014 sock = mdev->data.socket;
2016 if (likely(sock != NULL)) {
2017 ok = _drbd_send_cmd(mdev, sock, P_STATE,
2018 (struct p_header80 *)&p, sizeof(p), 0);
2021 mutex_unlock(&mdev->data.mutex);
2023 drbd_state_unlock(mdev);
2027 int drbd_send_state_req(struct drbd_conf *mdev,
2028 union drbd_state mask, union drbd_state val)
2030 struct p_req_state p;
2032 p.mask = cpu_to_be32(mask.i);
2033 p.val = cpu_to_be32(val.i);
2035 return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_STATE_CHG_REQ,
2036 (struct p_header80 *)&p, sizeof(p));
2039 int drbd_send_sr_reply(struct drbd_conf *mdev, enum drbd_state_rv retcode)
2041 struct p_req_state_reply p;
2043 p.retcode = cpu_to_be32(retcode);
2045 return drbd_send_cmd(mdev, USE_META_SOCKET, P_STATE_CHG_REPLY,
2046 (struct p_header80 *)&p, sizeof(p));
2049 int fill_bitmap_rle_bits(struct drbd_conf *mdev,
2050 struct p_compressed_bm *p,
2051 struct bm_xfer_ctx *c)
2053 struct bitstream bs;
2054 unsigned long plain_bits;
2061 /* may we use this feature? */
2062 if ((mdev->sync_conf.use_rle == 0) ||
2063 (mdev->agreed_pro_version < 90))
2066 if (c->bit_offset >= c->bm_bits)
2067 return 0; /* nothing to do. */
2069 /* use at most thus many bytes */
2070 bitstream_init(&bs, p->code, BM_PACKET_VLI_BYTES_MAX, 0);
2071 memset(p->code, 0, BM_PACKET_VLI_BYTES_MAX);
2072 /* plain bits covered in this code string */
2075 /* p->encoding & 0x80 stores whether the first run length is set.
2076 * bit offset is implicit.
2077 * start with toggle == 2 to be able to tell the first iteration */
2080 /* see how much plain bits we can stuff into one packet
2081 * using RLE and VLI. */
2083 tmp = (toggle == 0) ? _drbd_bm_find_next_zero(mdev, c->bit_offset)
2084 : _drbd_bm_find_next(mdev, c->bit_offset);
2087 rl = tmp - c->bit_offset;
2089 if (toggle == 2) { /* first iteration */
2091 /* the first checked bit was set,
2092 * store start value, */
2093 DCBP_set_start(p, 1);
2094 /* but skip encoding of zero run length */
2098 DCBP_set_start(p, 0);
2101 /* paranoia: catch zero runlength.
2102 * can only happen if bitmap is modified while we scan it. */
2104 dev_err(DEV, "unexpected zero runlength while encoding bitmap "
2105 "t:%u bo:%lu\n", toggle, c->bit_offset);
2109 bits = vli_encode_bits(&bs, rl);
2110 if (bits == -ENOBUFS) /* buffer full */
2113 dev_err(DEV, "error while encoding bitmap: %d\n", bits);
2119 c->bit_offset = tmp;
2120 } while (c->bit_offset < c->bm_bits);
2122 len = bs.cur.b - p->code + !!bs.cur.bit;
2124 if (plain_bits < (len << 3)) {
2125 /* incompressible with this method.
2126 * we need to rewind both word and bit position. */
2127 c->bit_offset -= plain_bits;
2128 bm_xfer_ctx_bit_to_word_offset(c);
2129 c->bit_offset = c->word_offset * BITS_PER_LONG;
2133 /* RLE + VLI was able to compress it just fine.
2134 * update c->word_offset. */
2135 bm_xfer_ctx_bit_to_word_offset(c);
2137 /* store pad_bits */
2138 DCBP_set_pad_bits(p, (8 - bs.cur.bit) & 0x7);
2143 enum { OK, FAILED, DONE }
2144 send_bitmap_rle_or_plain(struct drbd_conf *mdev,
2145 struct p_header80 *h, struct bm_xfer_ctx *c)
2147 struct p_compressed_bm *p = (void*)h;
2148 unsigned long num_words;
2152 len = fill_bitmap_rle_bits(mdev, p, c);
2158 DCBP_set_code(p, RLE_VLI_Bits);
2159 ok = _drbd_send_cmd(mdev, mdev->data.socket, P_COMPRESSED_BITMAP, h,
2160 sizeof(*p) + len, 0);
2163 c->bytes[0] += sizeof(*p) + len;
2165 if (c->bit_offset >= c->bm_bits)
2168 /* was not compressible.
2169 * send a buffer full of plain text bits instead. */
2170 num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset);
2171 len = num_words * sizeof(long);
2173 drbd_bm_get_lel(mdev, c->word_offset, num_words, (unsigned long*)h->payload);
2174 ok = _drbd_send_cmd(mdev, mdev->data.socket, P_BITMAP,
2175 h, sizeof(struct p_header80) + len, 0);
2176 c->word_offset += num_words;
2177 c->bit_offset = c->word_offset * BITS_PER_LONG;
2180 c->bytes[1] += sizeof(struct p_header80) + len;
2182 if (c->bit_offset > c->bm_bits)
2183 c->bit_offset = c->bm_bits;
2185 ok = ok ? ((len == 0) ? DONE : OK) : FAILED;
2188 INFO_bm_xfer_stats(mdev, "send", c);
2192 /* See the comment at receive_bitmap() */
2193 int _drbd_send_bitmap(struct drbd_conf *mdev)
2195 struct bm_xfer_ctx c;
2196 struct p_header80 *p;
2199 ERR_IF(!mdev->bitmap) return false;
2201 /* maybe we should use some per thread scratch page,
2202 * and allocate that during initial device creation? */
2203 p = (struct p_header80 *) __get_free_page(GFP_NOIO);
2205 dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__);
2209 if (get_ldev(mdev)) {
2210 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
2211 dev_info(DEV, "Writing the whole bitmap, MDF_FullSync was set.\n");
2212 drbd_bm_set_all(mdev);
2213 if (drbd_bm_write(mdev)) {
2214 /* write_bm did fail! Leave full sync flag set in Meta P_DATA
2215 * but otherwise process as per normal - need to tell other
2216 * side that a full resync is required! */
2217 dev_err(DEV, "Failed to write bitmap to disk!\n");
2219 drbd_md_clear_flag(mdev, MDF_FULL_SYNC);
2226 c = (struct bm_xfer_ctx) {
2227 .bm_bits = drbd_bm_bits(mdev),
2228 .bm_words = drbd_bm_words(mdev),
2232 ret = send_bitmap_rle_or_plain(mdev, p, &c);
2233 } while (ret == OK);
2235 free_page((unsigned long) p);
2236 return (ret == DONE);
2239 int drbd_send_bitmap(struct drbd_conf *mdev)
2243 if (!drbd_get_data_sock(mdev))
2245 err = !_drbd_send_bitmap(mdev);
2246 drbd_put_data_sock(mdev);
2250 int drbd_send_b_ack(struct drbd_conf *mdev, u32 barrier_nr, u32 set_size)
2253 struct p_barrier_ack p;
2255 p.barrier = barrier_nr;
2256 p.set_size = cpu_to_be32(set_size);
2258 if (mdev->state.conn < C_CONNECTED)
2260 ok = drbd_send_cmd(mdev, USE_META_SOCKET, P_BARRIER_ACK,
2261 (struct p_header80 *)&p, sizeof(p));
2266 * _drbd_send_ack() - Sends an ack packet
2267 * @mdev: DRBD device.
2268 * @cmd: Packet command code.
2269 * @sector: sector, needs to be in big endian byte order
2270 * @blksize: size in byte, needs to be in big endian byte order
2271 * @block_id: Id, big endian byte order
2273 static int _drbd_send_ack(struct drbd_conf *mdev, enum drbd_packets cmd,
2279 struct p_block_ack p;
2282 p.block_id = block_id;
2283 p.blksize = blksize;
2284 p.seq_num = cpu_to_be32(atomic_add_return(1, &mdev->packet_seq));
2286 if (!mdev->meta.socket || mdev->state.conn < C_CONNECTED)
2288 ok = drbd_send_cmd(mdev, USE_META_SOCKET, cmd,
2289 (struct p_header80 *)&p, sizeof(p));
2293 /* dp->sector and dp->block_id already/still in network byte order,
2294 * data_size is payload size according to dp->head,
2295 * and may need to be corrected for digest size. */
2296 int drbd_send_ack_dp(struct drbd_conf *mdev, enum drbd_packets cmd,
2297 struct p_data *dp, int data_size)
2299 data_size -= (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ?
2300 crypto_hash_digestsize(mdev->integrity_r_tfm) : 0;
2301 return _drbd_send_ack(mdev, cmd, dp->sector, cpu_to_be32(data_size),
2305 int drbd_send_ack_rp(struct drbd_conf *mdev, enum drbd_packets cmd,
2306 struct p_block_req *rp)
2308 return _drbd_send_ack(mdev, cmd, rp->sector, rp->blksize, rp->block_id);
2312 * drbd_send_ack() - Sends an ack packet
2313 * @mdev: DRBD device.
2314 * @cmd: Packet command code.
2317 int drbd_send_ack(struct drbd_conf *mdev,
2318 enum drbd_packets cmd, struct drbd_epoch_entry *e)
2320 return _drbd_send_ack(mdev, cmd,
2321 cpu_to_be64(e->sector),
2322 cpu_to_be32(e->size),
2326 /* This function misuses the block_id field to signal if the blocks
2327 * are is sync or not. */
2328 int drbd_send_ack_ex(struct drbd_conf *mdev, enum drbd_packets cmd,
2329 sector_t sector, int blksize, u64 block_id)
2331 return _drbd_send_ack(mdev, cmd,
2332 cpu_to_be64(sector),
2333 cpu_to_be32(blksize),
2334 cpu_to_be64(block_id));
2337 int drbd_send_drequest(struct drbd_conf *mdev, int cmd,
2338 sector_t sector, int size, u64 block_id)
2341 struct p_block_req p;
2343 p.sector = cpu_to_be64(sector);
2344 p.block_id = block_id;
2345 p.blksize = cpu_to_be32(size);
2347 ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, cmd,
2348 (struct p_header80 *)&p, sizeof(p));
2352 int drbd_send_drequest_csum(struct drbd_conf *mdev,
2353 sector_t sector, int size,
2354 void *digest, int digest_size,
2355 enum drbd_packets cmd)
2358 struct p_block_req p;
2360 p.sector = cpu_to_be64(sector);
2361 p.block_id = BE_DRBD_MAGIC + 0xbeef;
2362 p.blksize = cpu_to_be32(size);
2364 p.head.magic = BE_DRBD_MAGIC;
2365 p.head.command = cpu_to_be16(cmd);
2366 p.head.length = cpu_to_be16(sizeof(p) - sizeof(struct p_header80) + digest_size);
2368 mutex_lock(&mdev->data.mutex);
2370 ok = (sizeof(p) == drbd_send(mdev, mdev->data.socket, &p, sizeof(p), 0));
2371 ok = ok && (digest_size == drbd_send(mdev, mdev->data.socket, digest, digest_size, 0));
2373 mutex_unlock(&mdev->data.mutex);
2378 int drbd_send_ov_request(struct drbd_conf *mdev, sector_t sector, int size)
2381 struct p_block_req p;
2383 p.sector = cpu_to_be64(sector);
2384 p.block_id = BE_DRBD_MAGIC + 0xbabe;
2385 p.blksize = cpu_to_be32(size);
2387 ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_OV_REQUEST,
2388 (struct p_header80 *)&p, sizeof(p));
2392 /* called on sndtimeo
2393 * returns false if we should retry,
2394 * true if we think connection is dead
2396 static int we_should_drop_the_connection(struct drbd_conf *mdev, struct socket *sock)
2399 /* long elapsed = (long)(jiffies - mdev->last_received); */
2401 drop_it = mdev->meta.socket == sock
2402 || !mdev->asender.task
2403 || get_t_state(&mdev->asender) != Running
2404 || mdev->state.conn < C_CONNECTED;
2409 drop_it = !--mdev->ko_count;
2411 dev_err(DEV, "[%s/%d] sock_sendmsg time expired, ko = %u\n",
2412 current->comm, current->pid, mdev->ko_count);
2416 return drop_it; /* && (mdev->state == R_PRIMARY) */;
2419 /* The idea of sendpage seems to be to put some kind of reference
2420 * to the page into the skb, and to hand it over to the NIC. In
2421 * this process get_page() gets called.
2423 * As soon as the page was really sent over the network put_page()
2424 * gets called by some part of the network layer. [ NIC driver? ]
2426 * [ get_page() / put_page() increment/decrement the count. If count
2427 * reaches 0 the page will be freed. ]
2429 * This works nicely with pages from FSs.
2430 * But this means that in protocol A we might signal IO completion too early!
2432 * In order not to corrupt data during a resync we must make sure
2433 * that we do not reuse our own buffer pages (EEs) to early, therefore
2434 * we have the net_ee list.
2436 * XFS seems to have problems, still, it submits pages with page_count == 0!
2437 * As a workaround, we disable sendpage on pages
2438 * with page_count == 0 or PageSlab.
2440 static int _drbd_no_send_page(struct drbd_conf *mdev, struct page *page,
2441 int offset, size_t size, unsigned msg_flags)
2443 int sent = drbd_send(mdev, mdev->data.socket, kmap(page) + offset, size, msg_flags);
2446 mdev->send_cnt += size>>9;
2447 return sent == size;
2450 static int _drbd_send_page(struct drbd_conf *mdev, struct page *page,
2451 int offset, size_t size, unsigned msg_flags)
2453 mm_segment_t oldfs = get_fs();
2457 /* e.g. XFS meta- & log-data is in slab pages, which have a
2458 * page_count of 0 and/or have PageSlab() set.
2459 * we cannot use send_page for those, as that does get_page();
2460 * put_page(); and would cause either a VM_BUG directly, or
2461 * __page_cache_release a page that would actually still be referenced
2462 * by someone, leading to some obscure delayed Oops somewhere else. */
2463 if (disable_sendpage || (page_count(page) < 1) || PageSlab(page))
2464 return _drbd_no_send_page(mdev, page, offset, size, msg_flags);
2466 msg_flags |= MSG_NOSIGNAL;
2467 drbd_update_congested(mdev);
2470 sent = mdev->data.socket->ops->sendpage(mdev->data.socket, page,
2473 if (sent == -EAGAIN) {
2474 if (we_should_drop_the_connection(mdev,
2481 dev_warn(DEV, "%s: size=%d len=%d sent=%d\n",
2482 __func__, (int)size, len, sent);
2487 } while (len > 0 /* THINK && mdev->cstate >= C_CONNECTED*/);
2489 clear_bit(NET_CONGESTED, &mdev->flags);
2493 mdev->send_cnt += size>>9;
2497 static int _drbd_send_bio(struct drbd_conf *mdev, struct bio *bio)
2499 struct bio_vec *bvec;
2501 /* hint all but last page with MSG_MORE */
2502 __bio_for_each_segment(bvec, bio, i, 0) {
2503 if (!_drbd_no_send_page(mdev, bvec->bv_page,
2504 bvec->bv_offset, bvec->bv_len,
2505 i == bio->bi_vcnt -1 ? 0 : MSG_MORE))
2511 static int _drbd_send_zc_bio(struct drbd_conf *mdev, struct bio *bio)
2513 struct bio_vec *bvec;
2515 /* hint all but last page with MSG_MORE */
2516 __bio_for_each_segment(bvec, bio, i, 0) {
2517 if (!_drbd_send_page(mdev, bvec->bv_page,
2518 bvec->bv_offset, bvec->bv_len,
2519 i == bio->bi_vcnt -1 ? 0 : MSG_MORE))
2525 static int _drbd_send_zc_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e)
2527 struct page *page = e->pages;
2528 unsigned len = e->size;
2529 /* hint all but last page with MSG_MORE */
2530 page_chain_for_each(page) {
2531 unsigned l = min_t(unsigned, len, PAGE_SIZE);
2532 if (!_drbd_send_page(mdev, page, 0, l,
2533 page_chain_next(page) ? MSG_MORE : 0))
2540 static u32 bio_flags_to_wire(struct drbd_conf *mdev, unsigned long bi_rw)
2542 if (mdev->agreed_pro_version >= 95)
2543 return (bi_rw & REQ_SYNC ? DP_RW_SYNC : 0) |
2544 (bi_rw & REQ_FUA ? DP_FUA : 0) |
2545 (bi_rw & REQ_FLUSH ? DP_FLUSH : 0) |
2546 (bi_rw & REQ_DISCARD ? DP_DISCARD : 0);
2548 return bi_rw & REQ_SYNC ? DP_RW_SYNC : 0;
2551 /* Used to send write requests
2552 * R_PRIMARY -> Peer (P_DATA)
2554 int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req)
2558 unsigned int dp_flags = 0;
2562 if (!drbd_get_data_sock(mdev))
2565 dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_w_tfm) ?
2566 crypto_hash_digestsize(mdev->integrity_w_tfm) : 0;
2568 if (req->size <= DRBD_MAX_SIZE_H80_PACKET) {
2569 p.head.h80.magic = BE_DRBD_MAGIC;
2570 p.head.h80.command = cpu_to_be16(P_DATA);
2572 cpu_to_be16(sizeof(p) - sizeof(union p_header) + dgs + req->size);
2574 p.head.h95.magic = BE_DRBD_MAGIC_BIG;
2575 p.head.h95.command = cpu_to_be16(P_DATA);
2577 cpu_to_be32(sizeof(p) - sizeof(union p_header) + dgs + req->size);
2580 p.sector = cpu_to_be64(req->sector);
2581 p.block_id = (unsigned long)req;
2582 p.seq_num = cpu_to_be32(req->seq_num =
2583 atomic_add_return(1, &mdev->packet_seq));
2585 dp_flags = bio_flags_to_wire(mdev, req->master_bio->bi_rw);
2587 if (mdev->state.conn >= C_SYNC_SOURCE &&
2588 mdev->state.conn <= C_PAUSED_SYNC_T)
2589 dp_flags |= DP_MAY_SET_IN_SYNC;
2591 p.dp_flags = cpu_to_be32(dp_flags);
2592 set_bit(UNPLUG_REMOTE, &mdev->flags);
2594 drbd_send(mdev, mdev->data.socket, &p, sizeof(p), dgs ? MSG_MORE : 0));
2596 dgb = mdev->int_dig_out;
2597 drbd_csum_bio(mdev, mdev->integrity_w_tfm, req->master_bio, dgb);
2598 ok = dgs == drbd_send(mdev, mdev->data.socket, dgb, dgs, 0);
2601 /* For protocol A, we have to memcpy the payload into
2602 * socket buffers, as we may complete right away
2603 * as soon as we handed it over to tcp, at which point the data
2604 * pages may become invalid.
2606 * For data-integrity enabled, we copy it as well, so we can be
2607 * sure that even if the bio pages may still be modified, it
2608 * won't change the data on the wire, thus if the digest checks
2609 * out ok after sending on this side, but does not fit on the
2610 * receiving side, we sure have detected corruption elsewhere.
2612 if (mdev->net_conf->wire_protocol == DRBD_PROT_A || dgs)
2613 ok = _drbd_send_bio(mdev, req->master_bio);
2615 ok = _drbd_send_zc_bio(mdev, req->master_bio);
2617 /* double check digest, sometimes buffers have been modified in flight. */
2618 if (dgs > 0 && dgs <= 64) {
2619 /* 64 byte, 512 bit, is the larges digest size
2620 * currently supported in kernel crypto. */
2621 unsigned char digest[64];
2622 drbd_csum_bio(mdev, mdev->integrity_w_tfm, req->master_bio, digest);
2623 if (memcmp(mdev->int_dig_out, digest, dgs)) {
2625 "Digest mismatch, buffer modified by upper layers during write: %llus +%u\n",
2626 (unsigned long long)req->sector, req->size);
2628 } /* else if (dgs > 64) {
2629 ... Be noisy about digest too large ...
2633 drbd_put_data_sock(mdev);
2638 /* answer packet, used to send data back for read requests:
2639 * Peer -> (diskless) R_PRIMARY (P_DATA_REPLY)
2640 * C_SYNC_SOURCE -> C_SYNC_TARGET (P_RS_DATA_REPLY)
2642 int drbd_send_block(struct drbd_conf *mdev, enum drbd_packets cmd,
2643 struct drbd_epoch_entry *e)
2650 dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_w_tfm) ?
2651 crypto_hash_digestsize(mdev->integrity_w_tfm) : 0;
2653 if (e->size <= DRBD_MAX_SIZE_H80_PACKET) {
2654 p.head.h80.magic = BE_DRBD_MAGIC;
2655 p.head.h80.command = cpu_to_be16(cmd);
2657 cpu_to_be16(sizeof(p) - sizeof(struct p_header80) + dgs + e->size);
2659 p.head.h95.magic = BE_DRBD_MAGIC_BIG;
2660 p.head.h95.command = cpu_to_be16(cmd);
2662 cpu_to_be32(sizeof(p) - sizeof(struct p_header80) + dgs + e->size);
2665 p.sector = cpu_to_be64(e->sector);
2666 p.block_id = e->block_id;
2667 /* p.seq_num = 0; No sequence numbers here.. */
2669 /* Only called by our kernel thread.
2670 * This one may be interrupted by DRBD_SIG and/or DRBD_SIGKILL
2671 * in response to admin command or module unload.
2673 if (!drbd_get_data_sock(mdev))
2676 ok = sizeof(p) == drbd_send(mdev, mdev->data.socket, &p, sizeof(p), dgs ? MSG_MORE : 0);
2678 dgb = mdev->int_dig_out;
2679 drbd_csum_ee(mdev, mdev->integrity_w_tfm, e, dgb);
2680 ok = dgs == drbd_send(mdev, mdev->data.socket, dgb, dgs, 0);
2683 ok = _drbd_send_zc_ee(mdev, e);
2685 drbd_put_data_sock(mdev);
2690 int drbd_send_oos(struct drbd_conf *mdev, struct drbd_request *req)
2692 struct p_block_desc p;
2694 p.sector = cpu_to_be64(req->sector);
2695 p.blksize = cpu_to_be32(req->size);
2697 return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_OUT_OF_SYNC, &p.head, sizeof(p));
2701 drbd_send distinguishes two cases:
2703 Packets sent via the data socket "sock"
2704 and packets sent via the meta data socket "msock"
2707 -----------------+-------------------------+------------------------------
2708 timeout conf.timeout / 2 conf.timeout / 2
2709 timeout action send a ping via msock Abort communication
2710 and close all sockets
2714 * you must have down()ed the appropriate [m]sock_mutex elsewhere!
2716 int drbd_send(struct drbd_conf *mdev, struct socket *sock,
2717 void *buf, size_t size, unsigned msg_flags)
2726 /* THINK if (signal_pending) return ... ? */
2731 msg.msg_name = NULL;
2732 msg.msg_namelen = 0;
2733 msg.msg_control = NULL;
2734 msg.msg_controllen = 0;
2735 msg.msg_flags = msg_flags | MSG_NOSIGNAL;
2737 if (sock == mdev->data.socket) {
2738 mdev->ko_count = mdev->net_conf->ko_count;
2739 drbd_update_congested(mdev);
2743 * tcp_sendmsg does _not_ use its size parameter at all ?
2745 * -EAGAIN on timeout, -EINTR on signal.
2748 * do we need to block DRBD_SIG if sock == &meta.socket ??
2749 * otherwise wake_asender() might interrupt some send_*Ack !
2751 rv = kernel_sendmsg(sock, &msg, &iov, 1, size);
2752 if (rv == -EAGAIN) {
2753 if (we_should_drop_the_connection(mdev, sock))
2760 flush_signals(current);
2768 } while (sent < size);
2770 if (sock == mdev->data.socket)
2771 clear_bit(NET_CONGESTED, &mdev->flags);
2774 if (rv != -EAGAIN) {
2775 dev_err(DEV, "%s_sendmsg returned %d\n",
2776 sock == mdev->meta.socket ? "msock" : "sock",
2778 drbd_force_state(mdev, NS(conn, C_BROKEN_PIPE));
2780 drbd_force_state(mdev, NS(conn, C_TIMEOUT));
2786 static int drbd_open(struct block_device *bdev, fmode_t mode)
2788 struct drbd_conf *mdev = bdev->bd_disk->private_data;
2789 unsigned long flags;
2792 mutex_lock(&drbd_main_mutex);
2793 spin_lock_irqsave(&mdev->req_lock, flags);
2794 /* to have a stable mdev->state.role
2795 * and no race with updating open_cnt */
2797 if (mdev->state.role != R_PRIMARY) {
2798 if (mode & FMODE_WRITE)
2800 else if (!allow_oos)
2806 spin_unlock_irqrestore(&mdev->req_lock, flags);
2807 mutex_unlock(&drbd_main_mutex);
2812 static int drbd_release(struct gendisk *gd, fmode_t mode)
2814 struct drbd_conf *mdev = gd->private_data;
2815 mutex_lock(&drbd_main_mutex);
2817 mutex_unlock(&drbd_main_mutex);
2821 static void drbd_set_defaults(struct drbd_conf *mdev)
2823 /* This way we get a compile error when sync_conf grows,
2824 and we forgot to initialize it here */
2825 mdev->sync_conf = (struct syncer_conf) {
2826 /* .rate = */ DRBD_RATE_DEF,
2827 /* .after = */ DRBD_AFTER_DEF,
2828 /* .al_extents = */ DRBD_AL_EXTENTS_DEF,
2829 /* .verify_alg = */ {}, 0,
2830 /* .cpu_mask = */ {}, 0,
2831 /* .csums_alg = */ {}, 0,
2833 /* .on_no_data = */ DRBD_ON_NO_DATA_DEF,
2834 /* .c_plan_ahead = */ DRBD_C_PLAN_AHEAD_DEF,
2835 /* .c_delay_target = */ DRBD_C_DELAY_TARGET_DEF,
2836 /* .c_fill_target = */ DRBD_C_FILL_TARGET_DEF,
2837 /* .c_max_rate = */ DRBD_C_MAX_RATE_DEF,
2838 /* .c_min_rate = */ DRBD_C_MIN_RATE_DEF
2841 /* Have to use that way, because the layout differs between
2842 big endian and little endian */
2843 mdev->state = (union drbd_state) {
2844 { .role = R_SECONDARY,
2846 .conn = C_STANDALONE,
2855 void drbd_init_set_defaults(struct drbd_conf *mdev)
2857 /* the memset(,0,) did most of this.
2858 * note: only assignments, no allocation in here */
2860 drbd_set_defaults(mdev);
2862 atomic_set(&mdev->ap_bio_cnt, 0);
2863 atomic_set(&mdev->ap_pending_cnt, 0);
2864 atomic_set(&mdev->rs_pending_cnt, 0);
2865 atomic_set(&mdev->unacked_cnt, 0);
2866 atomic_set(&mdev->local_cnt, 0);
2867 atomic_set(&mdev->net_cnt, 0);
2868 atomic_set(&mdev->packet_seq, 0);
2869 atomic_set(&mdev->pp_in_use, 0);
2870 atomic_set(&mdev->pp_in_use_by_net, 0);
2871 atomic_set(&mdev->rs_sect_in, 0);
2872 atomic_set(&mdev->rs_sect_ev, 0);
2873 atomic_set(&mdev->ap_in_flight, 0);
2875 mutex_init(&mdev->md_io_mutex);
2876 mutex_init(&mdev->data.mutex);
2877 mutex_init(&mdev->meta.mutex);
2878 sema_init(&mdev->data.work.s, 0);
2879 sema_init(&mdev->meta.work.s, 0);
2880 mutex_init(&mdev->state_mutex);
2882 spin_lock_init(&mdev->data.work.q_lock);
2883 spin_lock_init(&mdev->meta.work.q_lock);
2885 spin_lock_init(&mdev->al_lock);
2886 spin_lock_init(&mdev->req_lock);
2887 spin_lock_init(&mdev->peer_seq_lock);
2888 spin_lock_init(&mdev->epoch_lock);
2890 INIT_LIST_HEAD(&mdev->active_ee);
2891 INIT_LIST_HEAD(&mdev->sync_ee);
2892 INIT_LIST_HEAD(&mdev->done_ee);
2893 INIT_LIST_HEAD(&mdev->read_ee);
2894 INIT_LIST_HEAD(&mdev->net_ee);
2895 INIT_LIST_HEAD(&mdev->resync_reads);
2896 INIT_LIST_HEAD(&mdev->data.work.q);
2897 INIT_LIST_HEAD(&mdev->meta.work.q);
2898 INIT_LIST_HEAD(&mdev->resync_work.list);
2899 INIT_LIST_HEAD(&mdev->unplug_work.list);
2900 INIT_LIST_HEAD(&mdev->go_diskless.list);
2901 INIT_LIST_HEAD(&mdev->md_sync_work.list);
2902 INIT_LIST_HEAD(&mdev->start_resync_work.list);
2903 INIT_LIST_HEAD(&mdev->bm_io_work.w.list);
2905 mdev->resync_work.cb = w_resync_inactive;
2906 mdev->unplug_work.cb = w_send_write_hint;
2907 mdev->go_diskless.cb = w_go_diskless;
2908 mdev->md_sync_work.cb = w_md_sync;
2909 mdev->bm_io_work.w.cb = w_bitmap_io;
2910 init_timer(&mdev->resync_timer);
2911 init_timer(&mdev->md_sync_timer);
2912 mdev->resync_timer.function = resync_timer_fn;
2913 mdev->resync_timer.data = (unsigned long) mdev;
2914 mdev->md_sync_timer.function = md_sync_timer_fn;
2915 mdev->md_sync_timer.data = (unsigned long) mdev;
2917 init_waitqueue_head(&mdev->misc_wait);
2918 init_waitqueue_head(&mdev->state_wait);
2919 init_waitqueue_head(&mdev->net_cnt_wait);
2920 init_waitqueue_head(&mdev->ee_wait);
2921 init_waitqueue_head(&mdev->al_wait);
2922 init_waitqueue_head(&mdev->seq_wait);
2924 drbd_thread_init(mdev, &mdev->receiver, drbdd_init);
2925 drbd_thread_init(mdev, &mdev->worker, drbd_worker);
2926 drbd_thread_init(mdev, &mdev->asender, drbd_asender);
2928 mdev->agreed_pro_version = PRO_VERSION_MAX;
2929 mdev->write_ordering = WO_bdev_flush;
2930 mdev->resync_wenr = LC_FREE;
2933 void drbd_mdev_cleanup(struct drbd_conf *mdev)
2936 if (mdev->receiver.t_state != None)
2937 dev_err(DEV, "ASSERT FAILED: receiver t_state == %d expected 0.\n",
2938 mdev->receiver.t_state);
2940 /* no need to lock it, I'm the only thread alive */
2941 if (atomic_read(&mdev->current_epoch->epoch_size) != 0)
2942 dev_err(DEV, "epoch_size:%d\n", atomic_read(&mdev->current_epoch->epoch_size));
2952 mdev->rs_failed = 0;
2953 mdev->rs_last_events = 0;
2954 mdev->rs_last_sect_ev = 0;
2955 for (i = 0; i < DRBD_SYNC_MARKS; i++) {
2956 mdev->rs_mark_left[i] = 0;
2957 mdev->rs_mark_time[i] = 0;
2959 D_ASSERT(mdev->net_conf == NULL);
2961 drbd_set_my_capacity(mdev, 0);
2963 /* maybe never allocated. */
2964 drbd_bm_resize(mdev, 0, 1);
2965 drbd_bm_cleanup(mdev);
2968 drbd_free_resources(mdev);
2969 clear_bit(AL_SUSPENDED, &mdev->flags);
2972 * currently we drbd_init_ee only on module load, so
2973 * we may do drbd_release_ee only on module unload!
2975 D_ASSERT(list_empty(&mdev->active_ee));
2976 D_ASSERT(list_empty(&mdev->sync_ee));
2977 D_ASSERT(list_empty(&mdev->done_ee));
2978 D_ASSERT(list_empty(&mdev->read_ee));
2979 D_ASSERT(list_empty(&mdev->net_ee));
2980 D_ASSERT(list_empty(&mdev->resync_reads));
2981 D_ASSERT(list_empty(&mdev->data.work.q));
2982 D_ASSERT(list_empty(&mdev->meta.work.q));
2983 D_ASSERT(list_empty(&mdev->resync_work.list));
2984 D_ASSERT(list_empty(&mdev->unplug_work.list));
2985 D_ASSERT(list_empty(&mdev->go_diskless.list));
2989 static void drbd_destroy_mempools(void)
2993 while (drbd_pp_pool) {
2994 page = drbd_pp_pool;
2995 drbd_pp_pool = (struct page *)page_private(page);
3000 /* D_ASSERT(atomic_read(&drbd_pp_vacant)==0); */
3002 if (drbd_ee_mempool)
3003 mempool_destroy(drbd_ee_mempool);
3004 if (drbd_request_mempool)
3005 mempool_destroy(drbd_request_mempool);
3007 kmem_cache_destroy(drbd_ee_cache);
3008 if (drbd_request_cache)
3009 kmem_cache_destroy(drbd_request_cache);
3010 if (drbd_bm_ext_cache)
3011 kmem_cache_destroy(drbd_bm_ext_cache);
3012 if (drbd_al_ext_cache)
3013 kmem_cache_destroy(drbd_al_ext_cache);
3015 drbd_ee_mempool = NULL;
3016 drbd_request_mempool = NULL;
3017 drbd_ee_cache = NULL;
3018 drbd_request_cache = NULL;
3019 drbd_bm_ext_cache = NULL;
3020 drbd_al_ext_cache = NULL;
3025 static int drbd_create_mempools(void)
3028 const int number = (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * minor_count;
3031 /* prepare our caches and mempools */
3032 drbd_request_mempool = NULL;
3033 drbd_ee_cache = NULL;
3034 drbd_request_cache = NULL;
3035 drbd_bm_ext_cache = NULL;
3036 drbd_al_ext_cache = NULL;
3037 drbd_pp_pool = NULL;
3040 drbd_request_cache = kmem_cache_create(
3041 "drbd_req", sizeof(struct drbd_request), 0, 0, NULL);
3042 if (drbd_request_cache == NULL)
3045 drbd_ee_cache = kmem_cache_create(
3046 "drbd_ee", sizeof(struct drbd_epoch_entry), 0, 0, NULL);
3047 if (drbd_ee_cache == NULL)
3050 drbd_bm_ext_cache = kmem_cache_create(
3051 "drbd_bm", sizeof(struct bm_extent), 0, 0, NULL);
3052 if (drbd_bm_ext_cache == NULL)
3055 drbd_al_ext_cache = kmem_cache_create(
3056 "drbd_al", sizeof(struct lc_element), 0, 0, NULL);
3057 if (drbd_al_ext_cache == NULL)
3061 drbd_request_mempool = mempool_create(number,
3062 mempool_alloc_slab, mempool_free_slab, drbd_request_cache);
3063 if (drbd_request_mempool == NULL)
3066 drbd_ee_mempool = mempool_create(number,
3067 mempool_alloc_slab, mempool_free_slab, drbd_ee_cache);
3068 if (drbd_ee_mempool == NULL)
3071 /* drbd's page pool */
3072 spin_lock_init(&drbd_pp_lock);
3074 for (i = 0; i < number; i++) {
3075 page = alloc_page(GFP_HIGHUSER);
3078 set_page_private(page, (unsigned long)drbd_pp_pool);
3079 drbd_pp_pool = page;
3081 drbd_pp_vacant = number;
3086 drbd_destroy_mempools(); /* in case we allocated some */
3090 static int drbd_notify_sys(struct notifier_block *this, unsigned long code,
3093 /* just so we have it. you never know what interesting things we
3094 * might want to do here some day...
3100 static struct notifier_block drbd_notifier = {
3101 .notifier_call = drbd_notify_sys,
3104 static void drbd_release_ee_lists(struct drbd_conf *mdev)
3108 rr = drbd_release_ee(mdev, &mdev->active_ee);
3110 dev_err(DEV, "%d EEs in active list found!\n", rr);
3112 rr = drbd_release_ee(mdev, &mdev->sync_ee);
3114 dev_err(DEV, "%d EEs in sync list found!\n", rr);
3116 rr = drbd_release_ee(mdev, &mdev->read_ee);
3118 dev_err(DEV, "%d EEs in read list found!\n", rr);
3120 rr = drbd_release_ee(mdev, &mdev->done_ee);
3122 dev_err(DEV, "%d EEs in done list found!\n", rr);
3124 rr = drbd_release_ee(mdev, &mdev->net_ee);
3126 dev_err(DEV, "%d EEs in net list found!\n", rr);
3129 /* caution. no locking.
3130 * currently only used from module cleanup code. */
3131 static void drbd_delete_device(unsigned int minor)
3133 struct drbd_conf *mdev = minor_to_mdev(minor);
3138 /* paranoia asserts */
3139 if (mdev->open_cnt != 0)
3140 dev_err(DEV, "open_cnt = %d in %s:%u", mdev->open_cnt,
3141 __FILE__ , __LINE__);
3143 ERR_IF (!list_empty(&mdev->data.work.q)) {
3144 struct list_head *lp;
3145 list_for_each(lp, &mdev->data.work.q) {
3146 dev_err(DEV, "lp = %p\n", lp);
3149 /* end paranoia asserts */
3151 del_gendisk(mdev->vdisk);
3153 /* cleanup stuff that may have been allocated during
3154 * device (re-)configuration or state changes */
3156 if (mdev->this_bdev)
3157 bdput(mdev->this_bdev);
3159 drbd_free_resources(mdev);
3161 drbd_release_ee_lists(mdev);
3163 /* should be free'd on disconnect? */
3164 kfree(mdev->ee_hash);
3166 mdev->ee_hash_s = 0;
3167 mdev->ee_hash = NULL;
3170 lc_destroy(mdev->act_log);
3171 lc_destroy(mdev->resync);
3173 kfree(mdev->p_uuid);
3174 /* mdev->p_uuid = NULL; */
3176 kfree(mdev->int_dig_out);
3177 kfree(mdev->int_dig_in);
3178 kfree(mdev->int_dig_vv);
3180 /* cleanup the rest that has been
3181 * allocated from drbd_new_device
3182 * and actually free the mdev itself */
3183 drbd_free_mdev(mdev);
3186 static void drbd_cleanup(void)
3190 unregister_reboot_notifier(&drbd_notifier);
3192 /* first remove proc,
3193 * drbdsetup uses it's presence to detect
3194 * whether DRBD is loaded.
3195 * If we would get stuck in proc removal,
3196 * but have netlink already deregistered,
3197 * some drbdsetup commands may wait forever
3201 remove_proc_entry("drbd", NULL);
3208 drbd_delete_device(i);
3209 drbd_destroy_mempools();
3214 unregister_blkdev(DRBD_MAJOR, "drbd");
3216 printk(KERN_INFO "drbd: module cleanup done.\n");
3220 * drbd_congested() - Callback for pdflush
3221 * @congested_data: User data
3222 * @bdi_bits: Bits pdflush is currently interested in
3224 * Returns 1<<BDI_async_congested and/or 1<<BDI_sync_congested if we are congested.
3226 static int drbd_congested(void *congested_data, int bdi_bits)
3228 struct drbd_conf *mdev = congested_data;
3229 struct request_queue *q;
3233 if (!__inc_ap_bio_cond(mdev)) {
3234 /* DRBD has frozen IO */
3240 if (get_ldev(mdev)) {
3241 q = bdev_get_queue(mdev->ldev->backing_bdev);
3242 r = bdi_congested(&q->backing_dev_info, bdi_bits);
3248 if (bdi_bits & (1 << BDI_async_congested) && test_bit(NET_CONGESTED, &mdev->flags)) {
3249 r |= (1 << BDI_async_congested);
3250 reason = reason == 'b' ? 'a' : 'n';
3254 mdev->congestion_reason = reason;
3258 struct drbd_conf *drbd_new_device(unsigned int minor)
3260 struct drbd_conf *mdev;
3261 struct gendisk *disk;
3262 struct request_queue *q;
3264 /* GFP_KERNEL, we are outside of all write-out paths */
3265 mdev = kzalloc(sizeof(struct drbd_conf), GFP_KERNEL);
3268 if (!zalloc_cpumask_var(&mdev->cpu_mask, GFP_KERNEL))
3269 goto out_no_cpumask;
3271 mdev->minor = minor;
3273 drbd_init_set_defaults(mdev);
3275 q = blk_alloc_queue(GFP_KERNEL);
3279 q->queuedata = mdev;
3281 disk = alloc_disk(1);
3286 set_disk_ro(disk, true);
3289 disk->major = DRBD_MAJOR;
3290 disk->first_minor = minor;
3291 disk->fops = &drbd_ops;
3292 sprintf(disk->disk_name, "drbd%d", minor);
3293 disk->private_data = mdev;
3295 mdev->this_bdev = bdget(MKDEV(DRBD_MAJOR, minor));
3296 /* we have no partitions. we contain only ourselves. */
3297 mdev->this_bdev->bd_contains = mdev->this_bdev;
3299 q->backing_dev_info.congested_fn = drbd_congested;
3300 q->backing_dev_info.congested_data = mdev;
3302 blk_queue_make_request(q, drbd_make_request);
3303 blk_queue_max_hw_sectors(q, DRBD_MAX_BIO_SIZE >> 9);
3304 blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
3305 blk_queue_merge_bvec(q, drbd_merge_bvec);
3306 q->queue_lock = &mdev->req_lock;
3308 mdev->md_io_page = alloc_page(GFP_KERNEL);
3309 if (!mdev->md_io_page)
3310 goto out_no_io_page;
3312 if (drbd_bm_init(mdev))
3314 /* no need to lock access, we are still initializing this minor device. */
3318 mdev->app_reads_hash = kzalloc(APP_R_HSIZE*sizeof(void *), GFP_KERNEL);
3319 if (!mdev->app_reads_hash)
3320 goto out_no_app_reads;
3322 mdev->current_epoch = kzalloc(sizeof(struct drbd_epoch), GFP_KERNEL);
3323 if (!mdev->current_epoch)
3326 INIT_LIST_HEAD(&mdev->current_epoch->list);
3331 /* out_whatever_else:
3332 kfree(mdev->current_epoch); */
3334 kfree(mdev->app_reads_hash);
3338 drbd_bm_cleanup(mdev);
3340 __free_page(mdev->md_io_page);
3344 blk_cleanup_queue(q);
3346 free_cpumask_var(mdev->cpu_mask);
3352 /* counterpart of drbd_new_device.
3353 * last part of drbd_delete_device. */
3354 void drbd_free_mdev(struct drbd_conf *mdev)
3356 kfree(mdev->current_epoch);
3357 kfree(mdev->app_reads_hash);
3359 if (mdev->bitmap) /* should no longer be there. */
3360 drbd_bm_cleanup(mdev);
3361 __free_page(mdev->md_io_page);
3362 put_disk(mdev->vdisk);
3363 blk_cleanup_queue(mdev->rq_queue);
3364 free_cpumask_var(mdev->cpu_mask);
3365 drbd_free_tl_hash(mdev);
3370 int __init drbd_init(void)
3374 if (sizeof(struct p_handshake) != 80) {
3376 "drbd: never change the size or layout "
3377 "of the HandShake packet.\n");
3381 if (1 > minor_count || minor_count > 255) {
3383 "drbd: invalid minor_count (%d)\n", minor_count);
3391 err = drbd_nl_init();
3395 err = register_blkdev(DRBD_MAJOR, "drbd");
3398 "drbd: unable to register block device major %d\n",
3403 register_reboot_notifier(&drbd_notifier);
3406 * allocate all necessary structs
3410 init_waitqueue_head(&drbd_pp_wait);
3412 drbd_proc = NULL; /* play safe for drbd_cleanup */
3413 minor_table = kzalloc(sizeof(struct drbd_conf *)*minor_count,
3418 err = drbd_create_mempools();
3422 drbd_proc = proc_create_data("drbd", S_IFREG | S_IRUGO , NULL, &drbd_proc_fops, NULL);
3424 printk(KERN_ERR "drbd: unable to register proc file\n");
3428 rwlock_init(&global_state_lock);
3430 printk(KERN_INFO "drbd: initialized. "
3431 "Version: " REL_VERSION " (api:%d/proto:%d-%d)\n",
3432 API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX);
3433 printk(KERN_INFO "drbd: %s\n", drbd_buildtag());
3434 printk(KERN_INFO "drbd: registered as block device major %d\n",
3436 printk(KERN_INFO "drbd: minor_table @ 0x%p\n", minor_table);
3438 return 0; /* Success! */
3443 /* currently always the case */
3444 printk(KERN_ERR "drbd: ran out of memory\n");
3446 printk(KERN_ERR "drbd: initialization failure\n");
3450 void drbd_free_bc(struct drbd_backing_dev *ldev)
3455 blkdev_put(ldev->backing_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
3456 blkdev_put(ldev->md_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
3461 void drbd_free_sock(struct drbd_conf *mdev)
3463 if (mdev->data.socket) {
3464 mutex_lock(&mdev->data.mutex);
3465 kernel_sock_shutdown(mdev->data.socket, SHUT_RDWR);
3466 sock_release(mdev->data.socket);
3467 mdev->data.socket = NULL;
3468 mutex_unlock(&mdev->data.mutex);
3470 if (mdev->meta.socket) {
3471 mutex_lock(&mdev->meta.mutex);
3472 kernel_sock_shutdown(mdev->meta.socket, SHUT_RDWR);
3473 sock_release(mdev->meta.socket);
3474 mdev->meta.socket = NULL;
3475 mutex_unlock(&mdev->meta.mutex);
3480 void drbd_free_resources(struct drbd_conf *mdev)
3482 crypto_free_hash(mdev->csums_tfm);
3483 mdev->csums_tfm = NULL;
3484 crypto_free_hash(mdev->verify_tfm);
3485 mdev->verify_tfm = NULL;
3486 crypto_free_hash(mdev->cram_hmac_tfm);
3487 mdev->cram_hmac_tfm = NULL;
3488 crypto_free_hash(mdev->integrity_w_tfm);
3489 mdev->integrity_w_tfm = NULL;
3490 crypto_free_hash(mdev->integrity_r_tfm);
3491 mdev->integrity_r_tfm = NULL;
3493 drbd_free_sock(mdev);
3496 drbd_free_bc(mdev->ldev);
3497 mdev->ldev = NULL;);
3500 /* meta data management */
3502 struct meta_data_on_disk {
3503 u64 la_size; /* last agreed size. */
3504 u64 uuid[UI_SIZE]; /* UUIDs. */
3507 u32 flags; /* MDF */
3510 u32 al_offset; /* offset to this block */
3511 u32 al_nr_extents; /* important for restoring the AL */
3512 /* `-- act_log->nr_elements <-- sync_conf.al_extents */
3513 u32 bm_offset; /* offset to the bitmap, from here */
3514 u32 bm_bytes_per_bit; /* BM_BLOCK_SIZE */
3515 u32 reserved_u32[4];
3520 * drbd_md_sync() - Writes the meta data super block if the MD_DIRTY flag bit is set
3521 * @mdev: DRBD device.
3523 void drbd_md_sync(struct drbd_conf *mdev)
3525 struct meta_data_on_disk *buffer;
3529 del_timer(&mdev->md_sync_timer);
3530 /* timer may be rearmed by drbd_md_mark_dirty() now. */
3531 if (!test_and_clear_bit(MD_DIRTY, &mdev->flags))
3534 /* We use here D_FAILED and not D_ATTACHING because we try to write
3535 * metadata even if we detach due to a disk failure! */
3536 if (!get_ldev_if_state(mdev, D_FAILED))
3539 mutex_lock(&mdev->md_io_mutex);
3540 buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);
3541 memset(buffer, 0, 512);
3543 buffer->la_size = cpu_to_be64(drbd_get_capacity(mdev->this_bdev));
3544 for (i = UI_CURRENT; i < UI_SIZE; i++)
3545 buffer->uuid[i] = cpu_to_be64(mdev->ldev->md.uuid[i]);
3546 buffer->flags = cpu_to_be32(mdev->ldev->md.flags);
3547 buffer->magic = cpu_to_be32(DRBD_MD_MAGIC);
3549 buffer->md_size_sect = cpu_to_be32(mdev->ldev->md.md_size_sect);
3550 buffer->al_offset = cpu_to_be32(mdev->ldev->md.al_offset);
3551 buffer->al_nr_extents = cpu_to_be32(mdev->act_log->nr_elements);
3552 buffer->bm_bytes_per_bit = cpu_to_be32(BM_BLOCK_SIZE);
3553 buffer->device_uuid = cpu_to_be64(mdev->ldev->md.device_uuid);
3555 buffer->bm_offset = cpu_to_be32(mdev->ldev->md.bm_offset);
3557 D_ASSERT(drbd_md_ss__(mdev, mdev->ldev) == mdev->ldev->md.md_offset);
3558 sector = mdev->ldev->md.md_offset;
3560 if (!drbd_md_sync_page_io(mdev, mdev->ldev, sector, WRITE)) {
3561 /* this was a try anyways ... */
3562 dev_err(DEV, "meta data update failed!\n");
3563 drbd_chk_io_error(mdev, 1, true);
3566 /* Update mdev->ldev->md.la_size_sect,
3567 * since we updated it on metadata. */
3568 mdev->ldev->md.la_size_sect = drbd_get_capacity(mdev->this_bdev);
3570 mutex_unlock(&mdev->md_io_mutex);
3575 * drbd_md_read() - Reads in the meta data super block
3576 * @mdev: DRBD device.
3577 * @bdev: Device from which the meta data should be read in.
3579 * Return 0 (NO_ERROR) on success, and an enum drbd_ret_code in case
3580 * something goes wrong. Currently only: ERR_IO_MD_DISK, ERR_MD_INVALID.
3582 int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
3584 struct meta_data_on_disk *buffer;
3585 int i, rv = NO_ERROR;
3587 if (!get_ldev_if_state(mdev, D_ATTACHING))
3588 return ERR_IO_MD_DISK;
3590 mutex_lock(&mdev->md_io_mutex);
3591 buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);
3593 if (!drbd_md_sync_page_io(mdev, bdev, bdev->md.md_offset, READ)) {
3594 /* NOTE: cant do normal error processing here as this is
3595 called BEFORE disk is attached */
3596 dev_err(DEV, "Error while reading metadata.\n");
3597 rv = ERR_IO_MD_DISK;
3601 if (be32_to_cpu(buffer->magic) != DRBD_MD_MAGIC) {
3602 dev_err(DEV, "Error while reading metadata, magic not found.\n");
3603 rv = ERR_MD_INVALID;
3606 if (be32_to_cpu(buffer->al_offset) != bdev->md.al_offset) {
3607 dev_err(DEV, "unexpected al_offset: %d (expected %d)\n",
3608 be32_to_cpu(buffer->al_offset), bdev->md.al_offset);
3609 rv = ERR_MD_INVALID;
3612 if (be32_to_cpu(buffer->bm_offset) != bdev->md.bm_offset) {
3613 dev_err(DEV, "unexpected bm_offset: %d (expected %d)\n",
3614 be32_to_cpu(buffer->bm_offset), bdev->md.bm_offset);
3615 rv = ERR_MD_INVALID;
3618 if (be32_to_cpu(buffer->md_size_sect) != bdev->md.md_size_sect) {
3619 dev_err(DEV, "unexpected md_size: %u (expected %u)\n",
3620 be32_to_cpu(buffer->md_size_sect), bdev->md.md_size_sect);
3621 rv = ERR_MD_INVALID;
3625 if (be32_to_cpu(buffer->bm_bytes_per_bit) != BM_BLOCK_SIZE) {
3626 dev_err(DEV, "unexpected bm_bytes_per_bit: %u (expected %u)\n",
3627 be32_to_cpu(buffer->bm_bytes_per_bit), BM_BLOCK_SIZE);
3628 rv = ERR_MD_INVALID;
3632 bdev->md.la_size_sect = be64_to_cpu(buffer->la_size);
3633 for (i = UI_CURRENT; i < UI_SIZE; i++)
3634 bdev->md.uuid[i] = be64_to_cpu(buffer->uuid[i]);
3635 bdev->md.flags = be32_to_cpu(buffer->flags);
3636 mdev->sync_conf.al_extents = be32_to_cpu(buffer->al_nr_extents);
3637 bdev->md.device_uuid = be64_to_cpu(buffer->device_uuid);
3639 if (mdev->sync_conf.al_extents < 7)
3640 mdev->sync_conf.al_extents = 127;
3643 mutex_unlock(&mdev->md_io_mutex);
3649 static void debug_drbd_uuid(struct drbd_conf *mdev, enum drbd_uuid_index index)
3651 static char *uuid_str[UI_EXTENDED_SIZE] = {
3652 [UI_CURRENT] = "CURRENT",
3653 [UI_BITMAP] = "BITMAP",
3654 [UI_HISTORY_START] = "HISTORY_START",
3655 [UI_HISTORY_END] = "HISTORY_END",
3657 [UI_FLAGS] = "FLAGS",
3660 if (index >= UI_EXTENDED_SIZE) {
3661 dev_warn(DEV, " uuid_index >= EXTENDED_SIZE\n");
3665 dynamic_dev_dbg(DEV, " uuid[%s] now %016llX\n",
3667 (unsigned long long)mdev->ldev->md.uuid[index]);
3672 * drbd_md_mark_dirty() - Mark meta data super block as dirty
3673 * @mdev: DRBD device.
3675 * Call this function if you change anything that should be written to
3676 * the meta-data super block. This function sets MD_DIRTY, and starts a
3677 * timer that ensures that within five seconds you have to call drbd_md_sync().
3680 void drbd_md_mark_dirty_(struct drbd_conf *mdev, unsigned int line, const char *func)
3682 if (!test_and_set_bit(MD_DIRTY, &mdev->flags)) {
3683 mod_timer(&mdev->md_sync_timer, jiffies + HZ);
3684 mdev->last_md_mark_dirty.line = line;
3685 mdev->last_md_mark_dirty.func = func;
3689 void drbd_md_mark_dirty(struct drbd_conf *mdev)
3691 if (!test_and_set_bit(MD_DIRTY, &mdev->flags))
3692 mod_timer(&mdev->md_sync_timer, jiffies + 5*HZ);
3696 static void drbd_uuid_move_history(struct drbd_conf *mdev) __must_hold(local)
3700 for (i = UI_HISTORY_START; i < UI_HISTORY_END; i++) {
3701 mdev->ldev->md.uuid[i+1] = mdev->ldev->md.uuid[i];
3702 debug_drbd_uuid(mdev, i+1);
3706 void _drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local)
3708 if (idx == UI_CURRENT) {
3709 if (mdev->state.role == R_PRIMARY)
3714 drbd_set_ed_uuid(mdev, val);
3717 mdev->ldev->md.uuid[idx] = val;
3718 debug_drbd_uuid(mdev, idx);
3719 drbd_md_mark_dirty(mdev);
3723 void drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local)
3725 if (mdev->ldev->md.uuid[idx]) {
3726 drbd_uuid_move_history(mdev);
3727 mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[idx];
3728 debug_drbd_uuid(mdev, UI_HISTORY_START);
3730 _drbd_uuid_set(mdev, idx, val);
3734 * drbd_uuid_new_current() - Creates a new current UUID
3735 * @mdev: DRBD device.
3737 * Creates a new current UUID, and rotates the old current UUID into
3738 * the bitmap slot. Causes an incremental resync upon next connect.
3740 void drbd_uuid_new_current(struct drbd_conf *mdev) __must_hold(local)
3744 dev_info(DEV, "Creating new current UUID\n");
3745 D_ASSERT(mdev->ldev->md.uuid[UI_BITMAP] == 0);
3746 mdev->ldev->md.uuid[UI_BITMAP] = mdev->ldev->md.uuid[UI_CURRENT];
3747 debug_drbd_uuid(mdev, UI_BITMAP);
3749 get_random_bytes(&val, sizeof(u64));
3750 _drbd_uuid_set(mdev, UI_CURRENT, val);
3751 /* get it to stable storage _now_ */
3755 void drbd_uuid_set_bm(struct drbd_conf *mdev, u64 val) __must_hold(local)
3757 if (mdev->ldev->md.uuid[UI_BITMAP] == 0 && val == 0)
3761 drbd_uuid_move_history(mdev);
3762 mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[UI_BITMAP];
3763 mdev->ldev->md.uuid[UI_BITMAP] = 0;
3764 debug_drbd_uuid(mdev, UI_HISTORY_START);
3765 debug_drbd_uuid(mdev, UI_BITMAP);
3767 if (mdev->ldev->md.uuid[UI_BITMAP])
3768 dev_warn(DEV, "bm UUID already set");
3770 mdev->ldev->md.uuid[UI_BITMAP] = val;
3771 mdev->ldev->md.uuid[UI_BITMAP] &= ~((u64)1);
3773 debug_drbd_uuid(mdev, UI_BITMAP);
3775 drbd_md_mark_dirty(mdev);
3779 * drbd_bmio_set_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
3780 * @mdev: DRBD device.
3782 * Sets all bits in the bitmap and writes the whole bitmap to stable storage.
3784 int drbd_bmio_set_n_write(struct drbd_conf *mdev)
3788 if (get_ldev_if_state(mdev, D_ATTACHING)) {
3789 drbd_md_set_flag(mdev, MDF_FULL_SYNC);
3791 drbd_bm_set_all(mdev);
3793 rv = drbd_bm_write(mdev);
3796 drbd_md_clear_flag(mdev, MDF_FULL_SYNC);
3807 * drbd_bmio_clear_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
3808 * @mdev: DRBD device.
3810 * Clears all bits in the bitmap and writes the whole bitmap to stable storage.
3812 int drbd_bmio_clear_n_write(struct drbd_conf *mdev)
3816 drbd_resume_al(mdev);
3817 if (get_ldev_if_state(mdev, D_ATTACHING)) {
3818 drbd_bm_clear_all(mdev);
3819 rv = drbd_bm_write(mdev);
3826 static int w_bitmap_io(struct drbd_conf *mdev, struct drbd_work *w, int unused)
3828 struct bm_io_work *work = container_of(w, struct bm_io_work, w);
3831 D_ASSERT(atomic_read(&mdev->ap_bio_cnt) == 0);
3833 drbd_bm_lock(mdev, work->why);
3834 rv = work->io_fn(mdev);
3835 drbd_bm_unlock(mdev);
3837 clear_bit(BITMAP_IO, &mdev->flags);
3838 smp_mb__after_clear_bit();
3839 wake_up(&mdev->misc_wait);
3842 work->done(mdev, rv);
3844 clear_bit(BITMAP_IO_QUEUED, &mdev->flags);
3850 void drbd_ldev_destroy(struct drbd_conf *mdev)
3852 lc_destroy(mdev->resync);
3853 mdev->resync = NULL;
3854 lc_destroy(mdev->act_log);
3855 mdev->act_log = NULL;
3857 drbd_free_bc(mdev->ldev);
3858 mdev->ldev = NULL;);
3860 if (mdev->md_io_tmpp) {
3861 __free_page(mdev->md_io_tmpp);
3862 mdev->md_io_tmpp = NULL;
3864 clear_bit(GO_DISKLESS, &mdev->flags);
3867 static int w_go_diskless(struct drbd_conf *mdev, struct drbd_work *w, int unused)
3869 D_ASSERT(mdev->state.disk == D_FAILED);
3870 /* we cannot assert local_cnt == 0 here, as get_ldev_if_state will
3871 * inc/dec it frequently. Once we are D_DISKLESS, no one will touch
3872 * the protected members anymore, though, so once put_ldev reaches zero
3873 * again, it will be safe to free them. */
3874 drbd_force_state(mdev, NS(disk, D_DISKLESS));
3878 void drbd_go_diskless(struct drbd_conf *mdev)
3880 D_ASSERT(mdev->state.disk == D_FAILED);
3881 if (!test_and_set_bit(GO_DISKLESS, &mdev->flags))
3882 drbd_queue_work(&mdev->data.work, &mdev->go_diskless);
3886 * drbd_queue_bitmap_io() - Queues an IO operation on the whole bitmap
3887 * @mdev: DRBD device.
3888 * @io_fn: IO callback to be called when bitmap IO is possible
3889 * @done: callback to be called after the bitmap IO was performed
3890 * @why: Descriptive text of the reason for doing the IO
3892 * While IO on the bitmap happens we freeze application IO thus we ensure
3893 * that drbd_set_out_of_sync() can not be called. This function MAY ONLY be
3894 * called from worker context. It MUST NOT be used while a previous such
3895 * work is still pending!
3897 void drbd_queue_bitmap_io(struct drbd_conf *mdev,
3898 int (*io_fn)(struct drbd_conf *),
3899 void (*done)(struct drbd_conf *, int),
3902 D_ASSERT(current == mdev->worker.task);
3904 D_ASSERT(!test_bit(BITMAP_IO_QUEUED, &mdev->flags));
3905 D_ASSERT(!test_bit(BITMAP_IO, &mdev->flags));
3906 D_ASSERT(list_empty(&mdev->bm_io_work.w.list));
3907 if (mdev->bm_io_work.why)
3908 dev_err(DEV, "FIXME going to queue '%s' but '%s' still pending?\n",
3909 why, mdev->bm_io_work.why);
3911 mdev->bm_io_work.io_fn = io_fn;
3912 mdev->bm_io_work.done = done;
3913 mdev->bm_io_work.why = why;
3915 spin_lock_irq(&mdev->req_lock);
3916 set_bit(BITMAP_IO, &mdev->flags);
3917 if (atomic_read(&mdev->ap_bio_cnt) == 0) {
3918 if (!test_and_set_bit(BITMAP_IO_QUEUED, &mdev->flags))
3919 drbd_queue_work(&mdev->data.work, &mdev->bm_io_work.w);
3921 spin_unlock_irq(&mdev->req_lock);
3925 * drbd_bitmap_io() - Does an IO operation on the whole bitmap
3926 * @mdev: DRBD device.
3927 * @io_fn: IO callback to be called when bitmap IO is possible
3928 * @why: Descriptive text of the reason for doing the IO
3930 * freezes application IO while that the actual IO operations runs. This
3931 * functions MAY NOT be called from worker context.
3933 int drbd_bitmap_io(struct drbd_conf *mdev, int (*io_fn)(struct drbd_conf *), char *why)
3937 D_ASSERT(current != mdev->worker.task);
3939 drbd_suspend_io(mdev);
3941 drbd_bm_lock(mdev, why);
3943 drbd_bm_unlock(mdev);
3945 drbd_resume_io(mdev);
3950 void drbd_md_set_flag(struct drbd_conf *mdev, int flag) __must_hold(local)
3952 if ((mdev->ldev->md.flags & flag) != flag) {
3953 drbd_md_mark_dirty(mdev);
3954 mdev->ldev->md.flags |= flag;
3958 void drbd_md_clear_flag(struct drbd_conf *mdev, int flag) __must_hold(local)
3960 if ((mdev->ldev->md.flags & flag) != 0) {
3961 drbd_md_mark_dirty(mdev);
3962 mdev->ldev->md.flags &= ~flag;
3965 int drbd_md_test_flag(struct drbd_backing_dev *bdev, int flag)
3967 return (bdev->md.flags & flag) != 0;
3970 static void md_sync_timer_fn(unsigned long data)
3972 struct drbd_conf *mdev = (struct drbd_conf *) data;
3974 drbd_queue_work_front(&mdev->data.work, &mdev->md_sync_work);
3977 static int w_md_sync(struct drbd_conf *mdev, struct drbd_work *w, int unused)
3979 dev_warn(DEV, "md_sync_timer expired! Worker calls drbd_md_sync().\n");
3981 dev_warn(DEV, "last md_mark_dirty: %s:%u\n",
3982 mdev->last_md_mark_dirty.func, mdev->last_md_mark_dirty.line);
3988 #ifdef CONFIG_DRBD_FAULT_INJECTION
3989 /* Fault insertion support including random number generator shamelessly
3990 * stolen from kernel/rcutorture.c */
3991 struct fault_random_state {
3992 unsigned long state;
3993 unsigned long count;
3996 #define FAULT_RANDOM_MULT 39916801 /* prime */
3997 #define FAULT_RANDOM_ADD 479001701 /* prime */
3998 #define FAULT_RANDOM_REFRESH 10000
4001 * Crude but fast random-number generator. Uses a linear congruential
4002 * generator, with occasional help from get_random_bytes().
4004 static unsigned long
4005 _drbd_fault_random(struct fault_random_state *rsp)
4009 if (!rsp->count--) {
4010 get_random_bytes(&refresh, sizeof(refresh));
4011 rsp->state += refresh;
4012 rsp->count = FAULT_RANDOM_REFRESH;
4014 rsp->state = rsp->state * FAULT_RANDOM_MULT + FAULT_RANDOM_ADD;
4015 return swahw32(rsp->state);
4019 _drbd_fault_str(unsigned int type) {
4020 static char *_faults[] = {
4021 [DRBD_FAULT_MD_WR] = "Meta-data write",
4022 [DRBD_FAULT_MD_RD] = "Meta-data read",
4023 [DRBD_FAULT_RS_WR] = "Resync write",
4024 [DRBD_FAULT_RS_RD] = "Resync read",
4025 [DRBD_FAULT_DT_WR] = "Data write",
4026 [DRBD_FAULT_DT_RD] = "Data read",
4027 [DRBD_FAULT_DT_RA] = "Data read ahead",
4028 [DRBD_FAULT_BM_ALLOC] = "BM allocation",
4029 [DRBD_FAULT_AL_EE] = "EE allocation",
4030 [DRBD_FAULT_RECEIVE] = "receive data corruption",
4033 return (type < DRBD_FAULT_MAX) ? _faults[type] : "**Unknown**";
4037 _drbd_insert_fault(struct drbd_conf *mdev, unsigned int type)
4039 static struct fault_random_state rrs = {0, 0};
4041 unsigned int ret = (
4043 ((1 << mdev_to_minor(mdev)) & fault_devs) != 0) &&
4044 (((_drbd_fault_random(&rrs) % 100) + 1) <= fault_rate));
4049 if (__ratelimit(&drbd_ratelimit_state))
4050 dev_warn(DEV, "***Simulating %s failure\n",
4051 _drbd_fault_str(type));
4058 const char *drbd_buildtag(void)
4060 /* DRBD built from external sources has here a reference to the
4061 git hash of the source code. */
4063 static char buildtag[38] = "\0uilt-in";
4065 if (buildtag[0] == 0) {
4066 #ifdef CONFIG_MODULES
4067 if (THIS_MODULE != NULL)
4068 sprintf(buildtag, "srcversion: %-24s", THIS_MODULE->srcversion);
4077 module_init(drbd_init)
4078 module_exit(drbd_cleanup)
4080 EXPORT_SYMBOL(drbd_conn_str);
4081 EXPORT_SYMBOL(drbd_role_str);
4082 EXPORT_SYMBOL(drbd_disk_str);
4083 EXPORT_SYMBOL(drbd_set_st_err_str);