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/smp_lock.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 int drbdd_init(struct drbd_thread *);
68 int drbd_worker(struct drbd_thread *);
69 int drbd_asender(struct drbd_thread *);
72 static int drbd_open(struct block_device *bdev, fmode_t mode);
73 static int drbd_release(struct gendisk *gd, fmode_t mode);
74 static int w_after_state_ch(struct drbd_conf *mdev, struct drbd_work *w, int unused);
75 static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
76 union drbd_state ns, enum chg_state_flags flags);
77 static int w_md_sync(struct drbd_conf *mdev, struct drbd_work *w, int unused);
78 static void md_sync_timer_fn(unsigned long data);
79 static int w_bitmap_io(struct drbd_conf *mdev, struct drbd_work *w, int unused);
81 MODULE_AUTHOR("Philipp Reisner <phil@linbit.com>, "
82 "Lars Ellenberg <lars@linbit.com>");
83 MODULE_DESCRIPTION("drbd - Distributed Replicated Block Device v" REL_VERSION);
84 MODULE_VERSION(REL_VERSION);
85 MODULE_LICENSE("GPL");
86 MODULE_PARM_DESC(minor_count, "Maximum number of drbd devices (1-255)");
87 MODULE_ALIAS_BLOCKDEV_MAJOR(DRBD_MAJOR);
89 #include <linux/moduleparam.h>
90 /* allow_open_on_secondary */
91 MODULE_PARM_DESC(allow_oos, "DONT USE!");
92 /* thanks to these macros, if compiled into the kernel (not-module),
93 * this becomes the boot parameter drbd.minor_count */
94 module_param(minor_count, uint, 0444);
95 module_param(disable_sendpage, bool, 0644);
96 module_param(allow_oos, bool, 0);
97 module_param(cn_idx, uint, 0444);
98 module_param(proc_details, int, 0644);
100 #ifdef CONFIG_DRBD_FAULT_INJECTION
103 static int fault_count;
105 /* bitmap of enabled faults */
106 module_param(enable_faults, int, 0664);
107 /* fault rate % value - applies to all enabled faults */
108 module_param(fault_rate, int, 0664);
109 /* count of faults inserted */
110 module_param(fault_count, int, 0664);
111 /* bitmap of devices to insert faults on */
112 module_param(fault_devs, int, 0644);
115 /* module parameter, defined */
116 unsigned int minor_count = 32;
117 int disable_sendpage;
119 unsigned int cn_idx = CN_IDX_DRBD;
120 int proc_details; /* Detail level in proc drbd*/
122 /* Module parameter for setting the user mode helper program
123 * to run. Default is /sbin/drbdadm */
124 char usermode_helper[80] = "/sbin/drbdadm";
126 module_param_string(usermode_helper, usermode_helper, sizeof(usermode_helper), 0644);
128 /* in 2.6.x, our device mapping and config info contains our virtual gendisks
129 * as member "struct gendisk *vdisk;"
131 struct drbd_conf **minor_table;
133 struct kmem_cache *drbd_request_cache;
134 struct kmem_cache *drbd_ee_cache; /* epoch entries */
135 struct kmem_cache *drbd_bm_ext_cache; /* bitmap extents */
136 struct kmem_cache *drbd_al_ext_cache; /* activity log extents */
137 mempool_t *drbd_request_mempool;
138 mempool_t *drbd_ee_mempool;
140 /* I do not use a standard mempool, because:
141 1) I want to hand out the pre-allocated objects first.
142 2) I want to be able to interrupt sleeping allocation with a signal.
143 Note: This is a single linked list, the next pointer is the private
144 member of struct page.
146 struct page *drbd_pp_pool;
147 spinlock_t drbd_pp_lock;
149 wait_queue_head_t drbd_pp_wait;
151 DEFINE_RATELIMIT_STATE(drbd_ratelimit_state, 5 * HZ, 5);
153 static const struct block_device_operations drbd_ops = {
154 .owner = THIS_MODULE,
156 .release = drbd_release,
159 #define ARRY_SIZE(A) (sizeof(A)/sizeof(A[0]))
162 /* When checking with sparse, and this is an inline function, sparse will
163 give tons of false positives. When this is a real functions sparse works.
165 int _get_ldev_if_state(struct drbd_conf *mdev, enum drbd_disk_state mins)
169 atomic_inc(&mdev->local_cnt);
170 io_allowed = (mdev->state.disk >= mins);
172 if (atomic_dec_and_test(&mdev->local_cnt))
173 wake_up(&mdev->misc_wait);
181 * DOC: The transfer log
183 * The transfer log is a single linked list of &struct drbd_tl_epoch objects.
184 * mdev->newest_tle points to the head, mdev->oldest_tle points to the tail
185 * of the list. There is always at least one &struct drbd_tl_epoch object.
187 * Each &struct drbd_tl_epoch has a circular double linked list of requests
190 static int tl_init(struct drbd_conf *mdev)
192 struct drbd_tl_epoch *b;
194 /* during device minor initialization, we may well use GFP_KERNEL */
195 b = kmalloc(sizeof(struct drbd_tl_epoch), GFP_KERNEL);
198 INIT_LIST_HEAD(&b->requests);
199 INIT_LIST_HEAD(&b->w.list);
203 b->w.cb = NULL; /* if this is != NULL, we need to dec_ap_pending in tl_clear */
205 mdev->oldest_tle = b;
206 mdev->newest_tle = b;
207 INIT_LIST_HEAD(&mdev->out_of_sequence_requests);
209 mdev->tl_hash = NULL;
215 static void tl_cleanup(struct drbd_conf *mdev)
217 D_ASSERT(mdev->oldest_tle == mdev->newest_tle);
218 D_ASSERT(list_empty(&mdev->out_of_sequence_requests));
219 kfree(mdev->oldest_tle);
220 mdev->oldest_tle = NULL;
221 kfree(mdev->unused_spare_tle);
222 mdev->unused_spare_tle = NULL;
223 kfree(mdev->tl_hash);
224 mdev->tl_hash = NULL;
229 * _tl_add_barrier() - Adds a barrier to the transfer log
230 * @mdev: DRBD device.
231 * @new: Barrier to be added before the current head of the TL.
233 * The caller must hold the req_lock.
235 void _tl_add_barrier(struct drbd_conf *mdev, struct drbd_tl_epoch *new)
237 struct drbd_tl_epoch *newest_before;
239 INIT_LIST_HEAD(&new->requests);
240 INIT_LIST_HEAD(&new->w.list);
241 new->w.cb = NULL; /* if this is != NULL, we need to dec_ap_pending in tl_clear */
245 newest_before = mdev->newest_tle;
246 /* never send a barrier number == 0, because that is special-cased
247 * when using TCQ for our write ordering code */
248 new->br_number = (newest_before->br_number+1) ?: 1;
249 if (mdev->newest_tle != new) {
250 mdev->newest_tle->next = new;
251 mdev->newest_tle = new;
256 * tl_release() - Free or recycle the oldest &struct drbd_tl_epoch object of the TL
257 * @mdev: DRBD device.
258 * @barrier_nr: Expected identifier of the DRBD write barrier packet.
259 * @set_size: Expected number of requests before that barrier.
261 * In case the passed barrier_nr or set_size does not match the oldest
262 * &struct drbd_tl_epoch objects this function will cause a termination
265 void tl_release(struct drbd_conf *mdev, unsigned int barrier_nr,
266 unsigned int set_size)
268 struct drbd_tl_epoch *b, *nob; /* next old barrier */
269 struct list_head *le, *tle;
270 struct drbd_request *r;
272 spin_lock_irq(&mdev->req_lock);
274 b = mdev->oldest_tle;
276 /* first some paranoia code */
278 dev_err(DEV, "BAD! BarrierAck #%u received, but no epoch in tl!?\n",
282 if (b->br_number != barrier_nr) {
283 dev_err(DEV, "BAD! BarrierAck #%u received, expected #%u!\n",
284 barrier_nr, b->br_number);
287 if (b->n_req != set_size) {
288 dev_err(DEV, "BAD! BarrierAck #%u received with n_req=%u, expected n_req=%u!\n",
289 barrier_nr, set_size, b->n_req);
293 /* Clean up list of requests processed during current epoch */
294 list_for_each_safe(le, tle, &b->requests) {
295 r = list_entry(le, struct drbd_request, tl_requests);
296 _req_mod(r, barrier_acked);
298 /* There could be requests on the list waiting for completion
299 of the write to the local disk. To avoid corruptions of
300 slab's data structures we have to remove the lists head.
302 Also there could have been a barrier ack out of sequence, overtaking
303 the write acks - which would be a bug and violating write ordering.
304 To not deadlock in case we lose connection while such requests are
305 still pending, we need some way to find them for the
306 _req_mode(connection_lost_while_pending).
308 These have been list_move'd to the out_of_sequence_requests list in
309 _req_mod(, barrier_acked) above.
311 list_del_init(&b->requests);
314 if (test_and_clear_bit(CREATE_BARRIER, &mdev->flags)) {
315 _tl_add_barrier(mdev, b);
317 mdev->oldest_tle = nob;
318 /* if nob == NULL b was the only barrier, and becomes the new
319 barrier. Therefore mdev->oldest_tle points already to b */
321 D_ASSERT(nob != NULL);
322 mdev->oldest_tle = nob;
326 spin_unlock_irq(&mdev->req_lock);
327 dec_ap_pending(mdev);
332 spin_unlock_irq(&mdev->req_lock);
333 drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR));
338 * tl_clear() - Clears all requests and &struct drbd_tl_epoch objects out of the TL
339 * @mdev: DRBD device.
341 * This is called after the connection to the peer was lost. The storage covered
342 * by the requests on the transfer gets marked as our of sync. Called from the
343 * receiver thread and the worker thread.
345 void tl_clear(struct drbd_conf *mdev)
347 struct drbd_tl_epoch *b, *tmp;
348 struct list_head *le, *tle;
349 struct drbd_request *r;
350 int new_initial_bnr = net_random();
352 spin_lock_irq(&mdev->req_lock);
354 b = mdev->oldest_tle;
356 list_for_each_safe(le, tle, &b->requests) {
357 r = list_entry(le, struct drbd_request, tl_requests);
358 /* It would be nice to complete outside of spinlock.
359 * But this is easier for now. */
360 _req_mod(r, connection_lost_while_pending);
364 /* there could still be requests on that ring list,
365 * in case local io is still pending */
366 list_del(&b->requests);
368 /* dec_ap_pending corresponding to queue_barrier.
369 * the newest barrier may not have been queued yet,
370 * in which case w.cb is still NULL. */
372 dec_ap_pending(mdev);
374 if (b == mdev->newest_tle) {
375 /* recycle, but reinit! */
376 D_ASSERT(tmp == NULL);
377 INIT_LIST_HEAD(&b->requests);
378 INIT_LIST_HEAD(&b->w.list);
380 b->br_number = new_initial_bnr;
383 mdev->oldest_tle = b;
390 /* we expect this list to be empty. */
391 D_ASSERT(list_empty(&mdev->out_of_sequence_requests));
393 /* but just in case, clean it up anyways! */
394 list_for_each_safe(le, tle, &mdev->out_of_sequence_requests) {
395 r = list_entry(le, struct drbd_request, tl_requests);
396 /* It would be nice to complete outside of spinlock.
397 * But this is easier for now. */
398 _req_mod(r, connection_lost_while_pending);
401 /* ensure bit indicating barrier is required is clear */
402 clear_bit(CREATE_BARRIER, &mdev->flags);
404 spin_unlock_irq(&mdev->req_lock);
408 * cl_wide_st_chg() - TRUE if the state change is a cluster wide one
409 * @mdev: DRBD device.
410 * @os: old (current) state.
411 * @ns: new (wanted) state.
413 static int cl_wide_st_chg(struct drbd_conf *mdev,
414 union drbd_state os, union drbd_state ns)
416 return (os.conn >= C_CONNECTED && ns.conn >= C_CONNECTED &&
417 ((os.role != R_PRIMARY && ns.role == R_PRIMARY) ||
418 (os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) ||
419 (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S) ||
420 (os.disk != D_DISKLESS && ns.disk == D_DISKLESS))) ||
421 (os.conn >= C_CONNECTED && ns.conn == C_DISCONNECTING) ||
422 (os.conn == C_CONNECTED && ns.conn == C_VERIFY_S);
425 int drbd_change_state(struct drbd_conf *mdev, enum chg_state_flags f,
426 union drbd_state mask, union drbd_state val)
429 union drbd_state os, ns;
432 spin_lock_irqsave(&mdev->req_lock, flags);
434 ns.i = (os.i & ~mask.i) | val.i;
435 rv = _drbd_set_state(mdev, ns, f, NULL);
437 spin_unlock_irqrestore(&mdev->req_lock, flags);
443 * drbd_force_state() - Impose a change which happens outside our control on our state
444 * @mdev: DRBD device.
445 * @mask: mask of state bits to change.
446 * @val: value of new state bits.
448 void drbd_force_state(struct drbd_conf *mdev,
449 union drbd_state mask, union drbd_state val)
451 drbd_change_state(mdev, CS_HARD, mask, val);
454 static int is_valid_state(struct drbd_conf *mdev, union drbd_state ns);
455 static int is_valid_state_transition(struct drbd_conf *,
456 union drbd_state, union drbd_state);
457 static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state os,
458 union drbd_state ns, int *warn_sync_abort);
459 int drbd_send_state_req(struct drbd_conf *,
460 union drbd_state, union drbd_state);
462 static enum drbd_state_ret_codes _req_st_cond(struct drbd_conf *mdev,
463 union drbd_state mask, union drbd_state val)
465 union drbd_state os, ns;
469 if (test_and_clear_bit(CL_ST_CHG_SUCCESS, &mdev->flags))
470 return SS_CW_SUCCESS;
472 if (test_and_clear_bit(CL_ST_CHG_FAIL, &mdev->flags))
473 return SS_CW_FAILED_BY_PEER;
476 spin_lock_irqsave(&mdev->req_lock, flags);
478 ns.i = (os.i & ~mask.i) | val.i;
479 ns = sanitize_state(mdev, os, ns, NULL);
481 if (!cl_wide_st_chg(mdev, os, ns))
484 rv = is_valid_state(mdev, ns);
485 if (rv == SS_SUCCESS) {
486 rv = is_valid_state_transition(mdev, ns, os);
487 if (rv == SS_SUCCESS)
488 rv = 0; /* cont waiting, otherwise fail. */
491 spin_unlock_irqrestore(&mdev->req_lock, flags);
497 * drbd_req_state() - Perform an eventually cluster wide state change
498 * @mdev: DRBD device.
499 * @mask: mask of state bits to change.
500 * @val: value of new state bits.
503 * Should not be called directly, use drbd_request_state() or
504 * _drbd_request_state().
506 static int drbd_req_state(struct drbd_conf *mdev,
507 union drbd_state mask, union drbd_state val,
508 enum chg_state_flags f)
510 struct completion done;
512 union drbd_state os, ns;
515 init_completion(&done);
517 if (f & CS_SERIALIZE)
518 mutex_lock(&mdev->state_mutex);
520 spin_lock_irqsave(&mdev->req_lock, flags);
522 ns.i = (os.i & ~mask.i) | val.i;
523 ns = sanitize_state(mdev, os, ns, NULL);
525 if (cl_wide_st_chg(mdev, os, ns)) {
526 rv = is_valid_state(mdev, ns);
527 if (rv == SS_SUCCESS)
528 rv = is_valid_state_transition(mdev, ns, os);
529 spin_unlock_irqrestore(&mdev->req_lock, flags);
531 if (rv < SS_SUCCESS) {
533 print_st_err(mdev, os, ns, rv);
537 drbd_state_lock(mdev);
538 if (!drbd_send_state_req(mdev, mask, val)) {
539 drbd_state_unlock(mdev);
540 rv = SS_CW_FAILED_BY_PEER;
542 print_st_err(mdev, os, ns, rv);
546 wait_event(mdev->state_wait,
547 (rv = _req_st_cond(mdev, mask, val)));
549 if (rv < SS_SUCCESS) {
550 drbd_state_unlock(mdev);
552 print_st_err(mdev, os, ns, rv);
555 spin_lock_irqsave(&mdev->req_lock, flags);
557 ns.i = (os.i & ~mask.i) | val.i;
558 rv = _drbd_set_state(mdev, ns, f, &done);
559 drbd_state_unlock(mdev);
561 rv = _drbd_set_state(mdev, ns, f, &done);
564 spin_unlock_irqrestore(&mdev->req_lock, flags);
566 if (f & CS_WAIT_COMPLETE && rv == SS_SUCCESS) {
567 D_ASSERT(current != mdev->worker.task);
568 wait_for_completion(&done);
572 if (f & CS_SERIALIZE)
573 mutex_unlock(&mdev->state_mutex);
579 * _drbd_request_state() - Request a state change (with flags)
580 * @mdev: DRBD device.
581 * @mask: mask of state bits to change.
582 * @val: value of new state bits.
585 * Cousin of drbd_request_state(), useful with the CS_WAIT_COMPLETE
586 * flag, or when logging of failed state change requests is not desired.
588 int _drbd_request_state(struct drbd_conf *mdev, union drbd_state mask,
589 union drbd_state val, enum chg_state_flags f)
593 wait_event(mdev->state_wait,
594 (rv = drbd_req_state(mdev, mask, val, f)) != SS_IN_TRANSIENT_STATE);
599 static void print_st(struct drbd_conf *mdev, char *name, union drbd_state ns)
601 dev_err(DEV, " %s = { cs:%s ro:%s/%s ds:%s/%s %c%c%c%c }\n",
603 drbd_conn_str(ns.conn),
604 drbd_role_str(ns.role),
605 drbd_role_str(ns.peer),
606 drbd_disk_str(ns.disk),
607 drbd_disk_str(ns.pdsk),
609 ns.aftr_isp ? 'a' : '-',
610 ns.peer_isp ? 'p' : '-',
611 ns.user_isp ? 'u' : '-'
615 void print_st_err(struct drbd_conf *mdev,
616 union drbd_state os, union drbd_state ns, int err)
618 if (err == SS_IN_TRANSIENT_STATE)
620 dev_err(DEV, "State change failed: %s\n", drbd_set_st_err_str(err));
621 print_st(mdev, " state", os);
622 print_st(mdev, "wanted", ns);
626 #define drbd_peer_str drbd_role_str
627 #define drbd_pdsk_str drbd_disk_str
629 #define drbd_susp_str(A) ((A) ? "1" : "0")
630 #define drbd_aftr_isp_str(A) ((A) ? "1" : "0")
631 #define drbd_peer_isp_str(A) ((A) ? "1" : "0")
632 #define drbd_user_isp_str(A) ((A) ? "1" : "0")
635 ({ if (ns.A != os.A) { \
636 pbp += sprintf(pbp, #A "( %s -> %s ) ", \
637 drbd_##A##_str(os.A), \
638 drbd_##A##_str(ns.A)); \
642 * is_valid_state() - Returns an SS_ error code if ns is not valid
643 * @mdev: DRBD device.
644 * @ns: State to consider.
646 static int is_valid_state(struct drbd_conf *mdev, union drbd_state ns)
648 /* See drbd_state_sw_errors in drbd_strings.c */
650 enum drbd_fencing_p fp;
654 if (get_ldev(mdev)) {
655 fp = mdev->ldev->dc.fencing;
659 if (get_net_conf(mdev)) {
660 if (!mdev->net_conf->two_primaries &&
661 ns.role == R_PRIMARY && ns.peer == R_PRIMARY)
662 rv = SS_TWO_PRIMARIES;
667 /* already found a reason to abort */;
668 else if (ns.role == R_SECONDARY && mdev->open_cnt)
669 rv = SS_DEVICE_IN_USE;
671 else if (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.disk < D_UP_TO_DATE)
672 rv = SS_NO_UP_TO_DATE_DISK;
674 else if (fp >= FP_RESOURCE &&
675 ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk >= D_UNKNOWN)
678 else if (ns.role == R_PRIMARY && ns.disk <= D_INCONSISTENT && ns.pdsk <= D_INCONSISTENT)
679 rv = SS_NO_UP_TO_DATE_DISK;
681 else if (ns.conn > C_CONNECTED && ns.disk < D_INCONSISTENT)
682 rv = SS_NO_LOCAL_DISK;
684 else if (ns.conn > C_CONNECTED && ns.pdsk < D_INCONSISTENT)
685 rv = SS_NO_REMOTE_DISK;
687 else if (ns.conn > C_CONNECTED && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE)
688 rv = SS_NO_UP_TO_DATE_DISK;
690 else if ((ns.conn == C_CONNECTED ||
691 ns.conn == C_WF_BITMAP_S ||
692 ns.conn == C_SYNC_SOURCE ||
693 ns.conn == C_PAUSED_SYNC_S) &&
694 ns.disk == D_OUTDATED)
695 rv = SS_CONNECTED_OUTDATES;
697 else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
698 (mdev->sync_conf.verify_alg[0] == 0))
699 rv = SS_NO_VERIFY_ALG;
701 else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
702 mdev->agreed_pro_version < 88)
703 rv = SS_NOT_SUPPORTED;
709 * is_valid_state_transition() - Returns an SS_ error code if the state transition is not possible
710 * @mdev: DRBD device.
714 static int is_valid_state_transition(struct drbd_conf *mdev,
715 union drbd_state ns, union drbd_state os)
719 if ((ns.conn == C_STARTING_SYNC_T || ns.conn == C_STARTING_SYNC_S) &&
720 os.conn > C_CONNECTED)
721 rv = SS_RESYNC_RUNNING;
723 if (ns.conn == C_DISCONNECTING && os.conn == C_STANDALONE)
724 rv = SS_ALREADY_STANDALONE;
726 if (ns.disk > D_ATTACHING && os.disk == D_DISKLESS)
729 if (ns.conn == C_WF_CONNECTION && os.conn < C_UNCONNECTED)
730 rv = SS_NO_NET_CONFIG;
732 if (ns.disk == D_OUTDATED && os.disk < D_OUTDATED && os.disk != D_ATTACHING)
733 rv = SS_LOWER_THAN_OUTDATED;
735 if (ns.conn == C_DISCONNECTING && os.conn == C_UNCONNECTED)
736 rv = SS_IN_TRANSIENT_STATE;
738 if (ns.conn == os.conn && ns.conn == C_WF_REPORT_PARAMS)
739 rv = SS_IN_TRANSIENT_STATE;
741 if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && os.conn < C_CONNECTED)
742 rv = SS_NEED_CONNECTION;
744 if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
745 ns.conn != os.conn && os.conn > C_CONNECTED)
746 rv = SS_RESYNC_RUNNING;
748 if ((ns.conn == C_STARTING_SYNC_S || ns.conn == C_STARTING_SYNC_T) &&
749 os.conn < C_CONNECTED)
750 rv = SS_NEED_CONNECTION;
756 * sanitize_state() - Resolves implicitly necessary additional changes to a state transition
757 * @mdev: DRBD device.
762 * When we loose connection, we have to set the state of the peers disk (pdsk)
763 * to D_UNKNOWN. This rule and many more along those lines are in this function.
765 static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state os,
766 union drbd_state ns, int *warn_sync_abort)
768 enum drbd_fencing_p fp;
771 if (get_ldev(mdev)) {
772 fp = mdev->ldev->dc.fencing;
776 /* Disallow Network errors to configure a device's network part */
777 if ((ns.conn >= C_TIMEOUT && ns.conn <= C_TEAR_DOWN) &&
778 os.conn <= C_DISCONNECTING)
781 /* After a network error (+C_TEAR_DOWN) only C_UNCONNECTED or C_DISCONNECTING can follow */
782 if (os.conn >= C_TIMEOUT && os.conn <= C_TEAR_DOWN &&
783 ns.conn != C_UNCONNECTED && ns.conn != C_DISCONNECTING)
786 /* After C_DISCONNECTING only C_STANDALONE may follow */
787 if (os.conn == C_DISCONNECTING && ns.conn != C_STANDALONE)
790 if (ns.conn < C_CONNECTED) {
793 if (ns.pdsk > D_UNKNOWN || ns.pdsk < D_INCONSISTENT)
797 /* Clear the aftr_isp when becoming unconfigured */
798 if (ns.conn == C_STANDALONE && ns.disk == D_DISKLESS && ns.role == R_SECONDARY)
801 if (ns.conn <= C_DISCONNECTING && ns.disk == D_DISKLESS)
804 /* Abort resync if a disk fails/detaches */
805 if (os.conn > C_CONNECTED && ns.conn > C_CONNECTED &&
806 (ns.disk <= D_FAILED || ns.pdsk <= D_FAILED)) {
808 *warn_sync_abort = 1;
809 ns.conn = C_CONNECTED;
812 if (ns.conn >= C_CONNECTED &&
813 ((ns.disk == D_CONSISTENT || ns.disk == D_OUTDATED) ||
814 (ns.disk == D_NEGOTIATING && ns.conn == C_WF_BITMAP_T))) {
817 case C_PAUSED_SYNC_T:
818 ns.disk = D_OUTDATED;
823 case C_PAUSED_SYNC_S:
824 ns.disk = D_UP_TO_DATE;
827 ns.disk = D_INCONSISTENT;
828 dev_warn(DEV, "Implicitly set disk state Inconsistent!\n");
831 if (os.disk == D_OUTDATED && ns.disk == D_UP_TO_DATE)
832 dev_warn(DEV, "Implicitly set disk from Outdated to UpToDate\n");
835 if (ns.conn >= C_CONNECTED &&
836 (ns.pdsk == D_CONSISTENT || ns.pdsk == D_OUTDATED)) {
840 case C_PAUSED_SYNC_T:
842 ns.pdsk = D_UP_TO_DATE;
845 case C_PAUSED_SYNC_S:
846 /* remap any consistent state to D_OUTDATED,
847 * but disallow "upgrade" of not even consistent states.
850 (D_DISKLESS < os.pdsk && os.pdsk < D_OUTDATED)
851 ? os.pdsk : D_OUTDATED;
854 ns.pdsk = D_INCONSISTENT;
855 dev_warn(DEV, "Implicitly set pdsk Inconsistent!\n");
858 if (os.pdsk == D_OUTDATED && ns.pdsk == D_UP_TO_DATE)
859 dev_warn(DEV, "Implicitly set pdsk from Outdated to UpToDate\n");
862 /* Connection breaks down before we finished "Negotiating" */
863 if (ns.conn < C_CONNECTED && ns.disk == D_NEGOTIATING &&
864 get_ldev_if_state(mdev, D_NEGOTIATING)) {
865 if (mdev->ed_uuid == mdev->ldev->md.uuid[UI_CURRENT]) {
866 ns.disk = mdev->new_state_tmp.disk;
867 ns.pdsk = mdev->new_state_tmp.pdsk;
869 dev_alert(DEV, "Connection lost while negotiating, no data!\n");
870 ns.disk = D_DISKLESS;
876 if (fp == FP_STONITH &&
877 (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk > D_OUTDATED) &&
878 !(os.role == R_PRIMARY && os.conn < C_CONNECTED && os.pdsk > D_OUTDATED))
881 if (ns.aftr_isp || ns.peer_isp || ns.user_isp) {
882 if (ns.conn == C_SYNC_SOURCE)
883 ns.conn = C_PAUSED_SYNC_S;
884 if (ns.conn == C_SYNC_TARGET)
885 ns.conn = C_PAUSED_SYNC_T;
887 if (ns.conn == C_PAUSED_SYNC_S)
888 ns.conn = C_SYNC_SOURCE;
889 if (ns.conn == C_PAUSED_SYNC_T)
890 ns.conn = C_SYNC_TARGET;
896 /* helper for __drbd_set_state */
897 static void set_ov_position(struct drbd_conf *mdev, enum drbd_conns cs)
899 if (cs == C_VERIFY_T) {
900 /* starting online verify from an arbitrary position
901 * does not fit well into the existing protocol.
902 * on C_VERIFY_T, we initialize ov_left and friends
903 * implicitly in receive_DataRequest once the
904 * first P_OV_REQUEST is received */
905 mdev->ov_start_sector = ~(sector_t)0;
907 unsigned long bit = BM_SECT_TO_BIT(mdev->ov_start_sector);
908 if (bit >= mdev->rs_total)
909 mdev->ov_start_sector =
910 BM_BIT_TO_SECT(mdev->rs_total - 1);
911 mdev->ov_position = mdev->ov_start_sector;
916 * __drbd_set_state() - Set a new DRBD state
917 * @mdev: DRBD device.
920 * @done: Optional completion, that will get completed after the after_state_ch() finished
922 * Caller needs to hold req_lock, and global_state_lock. Do not call directly.
924 int __drbd_set_state(struct drbd_conf *mdev,
925 union drbd_state ns, enum chg_state_flags flags,
926 struct completion *done)
930 int warn_sync_abort = 0;
931 struct after_state_chg_work *ascw;
935 ns = sanitize_state(mdev, os, ns, &warn_sync_abort);
938 return SS_NOTHING_TO_DO;
940 if (!(flags & CS_HARD)) {
941 /* pre-state-change checks ; only look at ns */
942 /* See drbd_state_sw_errors in drbd_strings.c */
944 rv = is_valid_state(mdev, ns);
945 if (rv < SS_SUCCESS) {
946 /* If the old state was illegal as well, then let
949 if (is_valid_state(mdev, os) == rv) {
950 dev_err(DEV, "Considering state change from bad state. "
951 "Error would be: '%s'\n",
952 drbd_set_st_err_str(rv));
953 print_st(mdev, "old", os);
954 print_st(mdev, "new", ns);
955 rv = is_valid_state_transition(mdev, ns, os);
958 rv = is_valid_state_transition(mdev, ns, os);
961 if (rv < SS_SUCCESS) {
962 if (flags & CS_VERBOSE)
963 print_st_err(mdev, os, ns, rv);
968 dev_warn(DEV, "Resync aborted.\n");
983 dev_info(DEV, "%s\n", pb);
986 /* solve the race between becoming unconfigured,
987 * worker doing the cleanup, and
988 * admin reconfiguring us:
989 * on (re)configure, first set CONFIG_PENDING,
990 * then wait for a potentially exiting worker,
991 * start the worker, and schedule one no_op.
992 * then proceed with configuration.
994 if (ns.disk == D_DISKLESS &&
995 ns.conn == C_STANDALONE &&
996 ns.role == R_SECONDARY &&
997 !test_and_set_bit(CONFIG_PENDING, &mdev->flags))
998 set_bit(DEVICE_DYING, &mdev->flags);
1000 mdev->state.i = ns.i;
1001 wake_up(&mdev->misc_wait);
1002 wake_up(&mdev->state_wait);
1004 /* post-state-change actions */
1005 if (os.conn >= C_SYNC_SOURCE && ns.conn <= C_CONNECTED) {
1006 set_bit(STOP_SYNC_TIMER, &mdev->flags);
1007 mod_timer(&mdev->resync_timer, jiffies);
1010 /* aborted verify run. log the last position */
1011 if ((os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) &&
1012 ns.conn < C_CONNECTED) {
1013 mdev->ov_start_sector =
1014 BM_BIT_TO_SECT(mdev->rs_total - mdev->ov_left);
1015 dev_info(DEV, "Online Verify reached sector %llu\n",
1016 (unsigned long long)mdev->ov_start_sector);
1019 if ((os.conn == C_PAUSED_SYNC_T || os.conn == C_PAUSED_SYNC_S) &&
1020 (ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)) {
1021 dev_info(DEV, "Syncer continues.\n");
1022 mdev->rs_paused += (long)jiffies-(long)mdev->rs_mark_time;
1023 if (ns.conn == C_SYNC_TARGET) {
1024 if (!test_and_clear_bit(STOP_SYNC_TIMER, &mdev->flags))
1025 mod_timer(&mdev->resync_timer, jiffies);
1026 /* This if (!test_bit) is only needed for the case
1027 that a device that has ceased to used its timer,
1028 i.e. it is already in drbd_resync_finished() gets
1029 paused and resumed. */
1033 if ((os.conn == C_SYNC_TARGET || os.conn == C_SYNC_SOURCE) &&
1034 (ns.conn == C_PAUSED_SYNC_T || ns.conn == C_PAUSED_SYNC_S)) {
1035 dev_info(DEV, "Resync suspended\n");
1036 mdev->rs_mark_time = jiffies;
1037 if (ns.conn == C_PAUSED_SYNC_T)
1038 set_bit(STOP_SYNC_TIMER, &mdev->flags);
1041 if (os.conn == C_CONNECTED &&
1042 (ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T)) {
1043 mdev->ov_position = 0;
1045 mdev->rs_mark_left = drbd_bm_bits(mdev);
1046 if (mdev->agreed_pro_version >= 90)
1047 set_ov_position(mdev, ns.conn);
1049 mdev->ov_start_sector = 0;
1050 mdev->ov_left = mdev->rs_total
1051 - BM_SECT_TO_BIT(mdev->ov_position);
1053 mdev->rs_mark_time = jiffies;
1054 mdev->ov_last_oos_size = 0;
1055 mdev->ov_last_oos_start = 0;
1057 if (ns.conn == C_VERIFY_S) {
1058 dev_info(DEV, "Starting Online Verify from sector %llu\n",
1059 (unsigned long long)mdev->ov_position);
1060 mod_timer(&mdev->resync_timer, jiffies);
1064 if (get_ldev(mdev)) {
1065 u32 mdf = mdev->ldev->md.flags & ~(MDF_CONSISTENT|MDF_PRIMARY_IND|
1066 MDF_CONNECTED_IND|MDF_WAS_UP_TO_DATE|
1067 MDF_PEER_OUT_DATED|MDF_CRASHED_PRIMARY);
1069 if (test_bit(CRASHED_PRIMARY, &mdev->flags))
1070 mdf |= MDF_CRASHED_PRIMARY;
1071 if (mdev->state.role == R_PRIMARY ||
1072 (mdev->state.pdsk < D_INCONSISTENT && mdev->state.peer == R_PRIMARY))
1073 mdf |= MDF_PRIMARY_IND;
1074 if (mdev->state.conn > C_WF_REPORT_PARAMS)
1075 mdf |= MDF_CONNECTED_IND;
1076 if (mdev->state.disk > D_INCONSISTENT)
1077 mdf |= MDF_CONSISTENT;
1078 if (mdev->state.disk > D_OUTDATED)
1079 mdf |= MDF_WAS_UP_TO_DATE;
1080 if (mdev->state.pdsk <= D_OUTDATED && mdev->state.pdsk >= D_INCONSISTENT)
1081 mdf |= MDF_PEER_OUT_DATED;
1082 if (mdf != mdev->ldev->md.flags) {
1083 mdev->ldev->md.flags = mdf;
1084 drbd_md_mark_dirty(mdev);
1086 if (os.disk < D_CONSISTENT && ns.disk >= D_CONSISTENT)
1087 drbd_set_ed_uuid(mdev, mdev->ldev->md.uuid[UI_CURRENT]);
1091 /* Peer was forced D_UP_TO_DATE & R_PRIMARY, consider to resync */
1092 if (os.disk == D_INCONSISTENT && os.pdsk == D_INCONSISTENT &&
1093 os.peer == R_SECONDARY && ns.peer == R_PRIMARY)
1094 set_bit(CONSIDER_RESYNC, &mdev->flags);
1096 /* Receiver should clean up itself */
1097 if (os.conn != C_DISCONNECTING && ns.conn == C_DISCONNECTING)
1098 drbd_thread_stop_nowait(&mdev->receiver);
1100 /* Now the receiver finished cleaning up itself, it should die */
1101 if (os.conn != C_STANDALONE && ns.conn == C_STANDALONE)
1102 drbd_thread_stop_nowait(&mdev->receiver);
1104 /* Upon network failure, we need to restart the receiver. */
1105 if (os.conn > C_TEAR_DOWN &&
1106 ns.conn <= C_TEAR_DOWN && ns.conn >= C_TIMEOUT)
1107 drbd_thread_restart_nowait(&mdev->receiver);
1109 ascw = kmalloc(sizeof(*ascw), GFP_ATOMIC);
1113 ascw->flags = flags;
1114 ascw->w.cb = w_after_state_ch;
1116 drbd_queue_work(&mdev->data.work, &ascw->w);
1118 dev_warn(DEV, "Could not kmalloc an ascw\n");
1124 static int w_after_state_ch(struct drbd_conf *mdev, struct drbd_work *w, int unused)
1126 struct after_state_chg_work *ascw =
1127 container_of(w, struct after_state_chg_work, w);
1128 after_state_ch(mdev, ascw->os, ascw->ns, ascw->flags);
1129 if (ascw->flags & CS_WAIT_COMPLETE) {
1130 D_ASSERT(ascw->done != NULL);
1131 complete(ascw->done);
1138 static void abw_start_sync(struct drbd_conf *mdev, int rv)
1141 dev_err(DEV, "Writing the bitmap failed not starting resync.\n");
1142 _drbd_request_state(mdev, NS(conn, C_CONNECTED), CS_VERBOSE);
1146 switch (mdev->state.conn) {
1147 case C_STARTING_SYNC_T:
1148 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE);
1150 case C_STARTING_SYNC_S:
1151 drbd_start_resync(mdev, C_SYNC_SOURCE);
1157 * after_state_ch() - Perform after state change actions that may sleep
1158 * @mdev: DRBD device.
1163 static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
1164 union drbd_state ns, enum chg_state_flags flags)
1166 enum drbd_fencing_p fp;
1168 if (os.conn != C_CONNECTED && ns.conn == C_CONNECTED) {
1169 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1171 mdev->p_uuid[UI_FLAGS] &= ~((u64)2);
1175 if (get_ldev(mdev)) {
1176 fp = mdev->ldev->dc.fencing;
1180 /* Inform userspace about the change... */
1181 drbd_bcast_state(mdev, ns);
1183 if (!(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE) &&
1184 (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE))
1185 drbd_khelper(mdev, "pri-on-incon-degr");
1187 /* Here we have the actions that are performed after a
1188 state change. This function might sleep */
1190 if (fp == FP_STONITH && ns.susp) {
1191 /* case1: The outdate peer handler is successful:
1192 * case2: The connection was established again: */
1193 if ((os.pdsk > D_OUTDATED && ns.pdsk <= D_OUTDATED) ||
1194 (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED)) {
1196 spin_lock_irq(&mdev->req_lock);
1197 _drbd_set_state(_NS(mdev, susp, 0), CS_VERBOSE, NULL);
1198 spin_unlock_irq(&mdev->req_lock);
1201 /* Do not change the order of the if above and the two below... */
1202 if (os.pdsk == D_DISKLESS && ns.pdsk > D_DISKLESS) { /* attach on the peer */
1203 drbd_send_uuids(mdev);
1204 drbd_send_state(mdev);
1206 if (os.conn != C_WF_BITMAP_S && ns.conn == C_WF_BITMAP_S)
1207 drbd_queue_bitmap_io(mdev, &drbd_send_bitmap, NULL, "send_bitmap (WFBitMapS)");
1209 /* Lost contact to peer's copy of the data */
1210 if ((os.pdsk >= D_INCONSISTENT &&
1211 os.pdsk != D_UNKNOWN &&
1212 os.pdsk != D_OUTDATED)
1213 && (ns.pdsk < D_INCONSISTENT ||
1214 ns.pdsk == D_UNKNOWN ||
1215 ns.pdsk == D_OUTDATED)) {
1216 kfree(mdev->p_uuid);
1217 mdev->p_uuid = NULL;
1218 if (get_ldev(mdev)) {
1219 if ((ns.role == R_PRIMARY || ns.peer == R_PRIMARY) &&
1220 mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE)
1221 atomic_set(&mdev->new_c_uuid, 2);
1226 if (ns.pdsk < D_INCONSISTENT && get_ldev(mdev)) {
1227 /* Diskless peer becomes primary or got connected do diskless, primary peer. */
1228 if (ns.peer == R_PRIMARY && mdev->ldev->md.uuid[UI_BITMAP] == 0)
1229 atomic_set(&mdev->new_c_uuid, 2);
1231 /* D_DISKLESS Peer becomes secondary */
1232 if (os.peer == R_PRIMARY && ns.peer == R_SECONDARY)
1233 drbd_al_to_on_disk_bm(mdev);
1237 /* Last part of the attaching process ... */
1238 if (ns.conn >= C_CONNECTED &&
1239 os.disk == D_ATTACHING && ns.disk == D_NEGOTIATING) {
1240 kfree(mdev->p_uuid); /* We expect to receive up-to-date UUIDs soon. */
1241 mdev->p_uuid = NULL; /* ...to not use the old ones in the mean time */
1242 drbd_send_sizes(mdev, 0, 0); /* to start sync... */
1243 drbd_send_uuids(mdev);
1244 drbd_send_state(mdev);
1247 /* We want to pause/continue resync, tell peer. */
1248 if (ns.conn >= C_CONNECTED &&
1249 ((os.aftr_isp != ns.aftr_isp) ||
1250 (os.user_isp != ns.user_isp)))
1251 drbd_send_state(mdev);
1253 /* In case one of the isp bits got set, suspend other devices. */
1254 if ((!os.aftr_isp && !os.peer_isp && !os.user_isp) &&
1255 (ns.aftr_isp || ns.peer_isp || ns.user_isp))
1256 suspend_other_sg(mdev);
1258 /* Make sure the peer gets informed about eventual state
1259 changes (ISP bits) while we were in WFReportParams. */
1260 if (os.conn == C_WF_REPORT_PARAMS && ns.conn >= C_CONNECTED)
1261 drbd_send_state(mdev);
1263 /* We are in the progress to start a full sync... */
1264 if ((os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) ||
1265 (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S))
1266 drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, &abw_start_sync, "set_n_write from StartingSync");
1268 /* We are invalidating our self... */
1269 if (os.conn < C_CONNECTED && ns.conn < C_CONNECTED &&
1270 os.disk > D_INCONSISTENT && ns.disk == D_INCONSISTENT)
1271 drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, NULL, "set_n_write from invalidate");
1273 if (os.disk > D_FAILED && ns.disk == D_FAILED) {
1274 enum drbd_io_error_p eh;
1277 if (get_ldev_if_state(mdev, D_FAILED)) {
1278 eh = mdev->ldev->dc.on_io_error;
1282 drbd_rs_cancel_all(mdev);
1283 /* since get_ldev() only works as long as disk>=D_INCONSISTENT,
1284 and it is D_DISKLESS here, local_cnt can only go down, it can
1285 not increase... It will reach zero */
1286 wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt));
1288 mdev->rs_failed = 0;
1289 atomic_set(&mdev->rs_pending_cnt, 0);
1291 spin_lock_irq(&mdev->req_lock);
1292 _drbd_set_state(_NS(mdev, disk, D_DISKLESS), CS_HARD, NULL);
1293 spin_unlock_irq(&mdev->req_lock);
1295 if (eh == EP_CALL_HELPER)
1296 drbd_khelper(mdev, "local-io-error");
1299 if (os.disk > D_DISKLESS && ns.disk == D_DISKLESS) {
1301 if (os.disk == D_FAILED) /* && ns.disk == D_DISKLESS*/ {
1302 if (drbd_send_state(mdev))
1303 dev_warn(DEV, "Notified peer that my disk is broken.\n");
1305 dev_err(DEV, "Sending state in drbd_io_error() failed\n");
1308 wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt));
1309 lc_destroy(mdev->resync);
1310 mdev->resync = NULL;
1311 lc_destroy(mdev->act_log);
1312 mdev->act_log = NULL;
1314 drbd_free_bc(mdev->ldev);
1315 mdev->ldev = NULL;);
1317 if (mdev->md_io_tmpp)
1318 __free_page(mdev->md_io_tmpp);
1321 /* Disks got bigger while they were detached */
1322 if (ns.disk > D_NEGOTIATING && ns.pdsk > D_NEGOTIATING &&
1323 test_and_clear_bit(RESYNC_AFTER_NEG, &mdev->flags)) {
1324 if (ns.conn == C_CONNECTED)
1325 resync_after_online_grow(mdev);
1328 /* A resync finished or aborted, wake paused devices... */
1329 if ((os.conn > C_CONNECTED && ns.conn <= C_CONNECTED) ||
1330 (os.peer_isp && !ns.peer_isp) ||
1331 (os.user_isp && !ns.user_isp))
1332 resume_next_sg(mdev);
1334 /* Upon network connection, we need to start the receiver */
1335 if (os.conn == C_STANDALONE && ns.conn == C_UNCONNECTED)
1336 drbd_thread_start(&mdev->receiver);
1338 /* Terminate worker thread if we are unconfigured - it will be
1339 restarted as needed... */
1340 if (ns.disk == D_DISKLESS &&
1341 ns.conn == C_STANDALONE &&
1342 ns.role == R_SECONDARY) {
1343 if (os.aftr_isp != ns.aftr_isp)
1344 resume_next_sg(mdev);
1345 /* set in __drbd_set_state, unless CONFIG_PENDING was set */
1346 if (test_bit(DEVICE_DYING, &mdev->flags))
1347 drbd_thread_stop_nowait(&mdev->worker);
1353 static int w_new_current_uuid(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
1355 if (get_ldev(mdev)) {
1356 drbd_uuid_new_current(mdev);
1357 if (get_net_conf(mdev)) {
1358 drbd_send_uuids(mdev);
1364 atomic_dec(&mdev->new_c_uuid);
1365 wake_up(&mdev->misc_wait);
1370 static int drbd_thread_setup(void *arg)
1372 struct drbd_thread *thi = (struct drbd_thread *) arg;
1373 struct drbd_conf *mdev = thi->mdev;
1374 unsigned long flags;
1378 retval = thi->function(thi);
1380 spin_lock_irqsave(&thi->t_lock, flags);
1382 /* if the receiver has been "Exiting", the last thing it did
1383 * was set the conn state to "StandAlone",
1384 * if now a re-connect request comes in, conn state goes C_UNCONNECTED,
1385 * and receiver thread will be "started".
1386 * drbd_thread_start needs to set "Restarting" in that case.
1387 * t_state check and assignment needs to be within the same spinlock,
1388 * so either thread_start sees Exiting, and can remap to Restarting,
1389 * or thread_start see None, and can proceed as normal.
1392 if (thi->t_state == Restarting) {
1393 dev_info(DEV, "Restarting %s\n", current->comm);
1394 thi->t_state = Running;
1395 spin_unlock_irqrestore(&thi->t_lock, flags);
1400 thi->t_state = None;
1402 complete(&thi->stop);
1403 spin_unlock_irqrestore(&thi->t_lock, flags);
1405 dev_info(DEV, "Terminating %s\n", current->comm);
1407 /* Release mod reference taken when thread was started */
1408 module_put(THIS_MODULE);
1412 static void drbd_thread_init(struct drbd_conf *mdev, struct drbd_thread *thi,
1413 int (*func) (struct drbd_thread *))
1415 spin_lock_init(&thi->t_lock);
1417 thi->t_state = None;
1418 thi->function = func;
1422 int drbd_thread_start(struct drbd_thread *thi)
1424 struct drbd_conf *mdev = thi->mdev;
1425 struct task_struct *nt;
1426 unsigned long flags;
1429 thi == &mdev->receiver ? "receiver" :
1430 thi == &mdev->asender ? "asender" :
1431 thi == &mdev->worker ? "worker" : "NONSENSE";
1433 /* is used from state engine doing drbd_thread_stop_nowait,
1434 * while holding the req lock irqsave */
1435 spin_lock_irqsave(&thi->t_lock, flags);
1437 switch (thi->t_state) {
1439 dev_info(DEV, "Starting %s thread (from %s [%d])\n",
1440 me, current->comm, current->pid);
1442 /* Get ref on module for thread - this is released when thread exits */
1443 if (!try_module_get(THIS_MODULE)) {
1444 dev_err(DEV, "Failed to get module reference in drbd_thread_start\n");
1445 spin_unlock_irqrestore(&thi->t_lock, flags);
1449 init_completion(&thi->stop);
1450 D_ASSERT(thi->task == NULL);
1451 thi->reset_cpu_mask = 1;
1452 thi->t_state = Running;
1453 spin_unlock_irqrestore(&thi->t_lock, flags);
1454 flush_signals(current); /* otherw. may get -ERESTARTNOINTR */
1456 nt = kthread_create(drbd_thread_setup, (void *) thi,
1457 "drbd%d_%s", mdev_to_minor(mdev), me);
1460 dev_err(DEV, "Couldn't start thread\n");
1462 module_put(THIS_MODULE);
1465 spin_lock_irqsave(&thi->t_lock, flags);
1467 thi->t_state = Running;
1468 spin_unlock_irqrestore(&thi->t_lock, flags);
1469 wake_up_process(nt);
1472 thi->t_state = Restarting;
1473 dev_info(DEV, "Restarting %s thread (from %s [%d])\n",
1474 me, current->comm, current->pid);
1479 spin_unlock_irqrestore(&thi->t_lock, flags);
1487 void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait)
1489 unsigned long flags;
1491 enum drbd_thread_state ns = restart ? Restarting : Exiting;
1493 /* may be called from state engine, holding the req lock irqsave */
1494 spin_lock_irqsave(&thi->t_lock, flags);
1496 if (thi->t_state == None) {
1497 spin_unlock_irqrestore(&thi->t_lock, flags);
1499 drbd_thread_start(thi);
1503 if (thi->t_state != ns) {
1504 if (thi->task == NULL) {
1505 spin_unlock_irqrestore(&thi->t_lock, flags);
1511 init_completion(&thi->stop);
1512 if (thi->task != current)
1513 force_sig(DRBD_SIGKILL, thi->task);
1517 spin_unlock_irqrestore(&thi->t_lock, flags);
1520 wait_for_completion(&thi->stop);
1525 * drbd_calc_cpu_mask() - Generate CPU masks, spread over all CPUs
1526 * @mdev: DRBD device.
1528 * Forces all threads of a device onto the same CPU. This is beneficial for
1529 * DRBD's performance. May be overwritten by user's configuration.
1531 void drbd_calc_cpu_mask(struct drbd_conf *mdev)
1535 /* user override. */
1536 if (cpumask_weight(mdev->cpu_mask))
1539 ord = mdev_to_minor(mdev) % cpumask_weight(cpu_online_mask);
1540 for_each_online_cpu(cpu) {
1542 cpumask_set_cpu(cpu, mdev->cpu_mask);
1546 /* should not be reached */
1547 cpumask_setall(mdev->cpu_mask);
1551 * drbd_thread_current_set_cpu() - modifies the cpu mask of the _current_ thread
1552 * @mdev: DRBD device.
1554 * call in the "main loop" of _all_ threads, no need for any mutex, current won't die
1557 void drbd_thread_current_set_cpu(struct drbd_conf *mdev)
1559 struct task_struct *p = current;
1560 struct drbd_thread *thi =
1561 p == mdev->asender.task ? &mdev->asender :
1562 p == mdev->receiver.task ? &mdev->receiver :
1563 p == mdev->worker.task ? &mdev->worker :
1567 if (!thi->reset_cpu_mask)
1569 thi->reset_cpu_mask = 0;
1570 set_cpus_allowed_ptr(p, mdev->cpu_mask);
1574 /* the appropriate socket mutex must be held already */
1575 int _drbd_send_cmd(struct drbd_conf *mdev, struct socket *sock,
1576 enum drbd_packets cmd, struct p_header *h,
1577 size_t size, unsigned msg_flags)
1581 ERR_IF(!h) return FALSE;
1582 ERR_IF(!size) return FALSE;
1584 h->magic = BE_DRBD_MAGIC;
1585 h->command = cpu_to_be16(cmd);
1586 h->length = cpu_to_be16(size-sizeof(struct p_header));
1588 sent = drbd_send(mdev, sock, h, size, msg_flags);
1590 ok = (sent == size);
1592 dev_err(DEV, "short sent %s size=%d sent=%d\n",
1593 cmdname(cmd), (int)size, sent);
1597 /* don't pass the socket. we may only look at it
1598 * when we hold the appropriate socket mutex.
1600 int drbd_send_cmd(struct drbd_conf *mdev, int use_data_socket,
1601 enum drbd_packets cmd, struct p_header *h, size_t size)
1604 struct socket *sock;
1606 if (use_data_socket) {
1607 mutex_lock(&mdev->data.mutex);
1608 sock = mdev->data.socket;
1610 mutex_lock(&mdev->meta.mutex);
1611 sock = mdev->meta.socket;
1614 /* drbd_disconnect() could have called drbd_free_sock()
1615 * while we were waiting in down()... */
1616 if (likely(sock != NULL))
1617 ok = _drbd_send_cmd(mdev, sock, cmd, h, size, 0);
1619 if (use_data_socket)
1620 mutex_unlock(&mdev->data.mutex);
1622 mutex_unlock(&mdev->meta.mutex);
1626 int drbd_send_cmd2(struct drbd_conf *mdev, enum drbd_packets cmd, char *data,
1632 h.magic = BE_DRBD_MAGIC;
1633 h.command = cpu_to_be16(cmd);
1634 h.length = cpu_to_be16(size);
1636 if (!drbd_get_data_sock(mdev))
1640 drbd_send(mdev, mdev->data.socket, &h, sizeof(h), 0));
1642 drbd_send(mdev, mdev->data.socket, data, size, 0));
1644 drbd_put_data_sock(mdev);
1649 int drbd_send_sync_param(struct drbd_conf *mdev, struct syncer_conf *sc)
1651 struct p_rs_param_89 *p;
1652 struct socket *sock;
1654 const int apv = mdev->agreed_pro_version;
1656 size = apv <= 87 ? sizeof(struct p_rs_param)
1657 : apv == 88 ? sizeof(struct p_rs_param)
1658 + strlen(mdev->sync_conf.verify_alg) + 1
1659 : /* 89 */ sizeof(struct p_rs_param_89);
1661 /* used from admin command context and receiver/worker context.
1662 * to avoid kmalloc, grab the socket right here,
1663 * then use the pre-allocated sbuf there */
1664 mutex_lock(&mdev->data.mutex);
1665 sock = mdev->data.socket;
1667 if (likely(sock != NULL)) {
1668 enum drbd_packets cmd = apv >= 89 ? P_SYNC_PARAM89 : P_SYNC_PARAM;
1670 p = &mdev->data.sbuf.rs_param_89;
1672 /* initialize verify_alg and csums_alg */
1673 memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX);
1675 p->rate = cpu_to_be32(sc->rate);
1678 strcpy(p->verify_alg, mdev->sync_conf.verify_alg);
1680 strcpy(p->csums_alg, mdev->sync_conf.csums_alg);
1682 rv = _drbd_send_cmd(mdev, sock, cmd, &p->head, size, 0);
1684 rv = 0; /* not ok */
1686 mutex_unlock(&mdev->data.mutex);
1691 int drbd_send_protocol(struct drbd_conf *mdev)
1693 struct p_protocol *p;
1696 size = sizeof(struct p_protocol);
1698 if (mdev->agreed_pro_version >= 87)
1699 size += strlen(mdev->net_conf->integrity_alg) + 1;
1701 /* we must not recurse into our own queue,
1702 * as that is blocked during handshake */
1703 p = kmalloc(size, GFP_NOIO);
1707 p->protocol = cpu_to_be32(mdev->net_conf->wire_protocol);
1708 p->after_sb_0p = cpu_to_be32(mdev->net_conf->after_sb_0p);
1709 p->after_sb_1p = cpu_to_be32(mdev->net_conf->after_sb_1p);
1710 p->after_sb_2p = cpu_to_be32(mdev->net_conf->after_sb_2p);
1711 p->two_primaries = cpu_to_be32(mdev->net_conf->two_primaries);
1714 if (mdev->net_conf->want_lose)
1716 if (mdev->net_conf->dry_run) {
1717 if (mdev->agreed_pro_version >= 92)
1720 dev_err(DEV, "--dry-run is not supported by peer");
1725 p->conn_flags = cpu_to_be32(cf);
1727 if (mdev->agreed_pro_version >= 87)
1728 strcpy(p->integrity_alg, mdev->net_conf->integrity_alg);
1730 rv = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_PROTOCOL,
1731 (struct p_header *)p, size);
1736 int _drbd_send_uuids(struct drbd_conf *mdev, u64 uuid_flags)
1741 if (!get_ldev_if_state(mdev, D_NEGOTIATING))
1744 for (i = UI_CURRENT; i < UI_SIZE; i++)
1745 p.uuid[i] = mdev->ldev ? cpu_to_be64(mdev->ldev->md.uuid[i]) : 0;
1747 mdev->comm_bm_set = drbd_bm_total_weight(mdev);
1748 p.uuid[UI_SIZE] = cpu_to_be64(mdev->comm_bm_set);
1749 uuid_flags |= mdev->net_conf->want_lose ? 1 : 0;
1750 uuid_flags |= test_bit(CRASHED_PRIMARY, &mdev->flags) ? 2 : 0;
1751 uuid_flags |= mdev->new_state_tmp.disk == D_INCONSISTENT ? 4 : 0;
1752 p.uuid[UI_FLAGS] = cpu_to_be64(uuid_flags);
1756 return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_UUIDS,
1757 (struct p_header *)&p, sizeof(p));
1760 int drbd_send_uuids(struct drbd_conf *mdev)
1762 return _drbd_send_uuids(mdev, 0);
1765 int drbd_send_uuids_skip_initial_sync(struct drbd_conf *mdev)
1767 return _drbd_send_uuids(mdev, 8);
1771 int drbd_send_sync_uuid(struct drbd_conf *mdev, u64 val)
1775 p.uuid = cpu_to_be64(val);
1777 return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_SYNC_UUID,
1778 (struct p_header *)&p, sizeof(p));
1781 int drbd_send_sizes(struct drbd_conf *mdev, int trigger_reply, enum dds_flags flags)
1784 sector_t d_size, u_size;
1788 if (get_ldev_if_state(mdev, D_NEGOTIATING)) {
1789 D_ASSERT(mdev->ldev->backing_bdev);
1790 d_size = drbd_get_max_capacity(mdev->ldev);
1791 u_size = mdev->ldev->dc.disk_size;
1792 q_order_type = drbd_queue_order_type(mdev);
1797 q_order_type = QUEUE_ORDERED_NONE;
1800 p.d_size = cpu_to_be64(d_size);
1801 p.u_size = cpu_to_be64(u_size);
1802 p.c_size = cpu_to_be64(trigger_reply ? 0 : drbd_get_capacity(mdev->this_bdev));
1803 p.max_segment_size = cpu_to_be32(queue_max_segment_size(mdev->rq_queue));
1804 p.queue_order_type = cpu_to_be16(q_order_type);
1805 p.dds_flags = cpu_to_be16(flags);
1807 ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_SIZES,
1808 (struct p_header *)&p, sizeof(p));
1813 * drbd_send_state() - Sends the drbd state to the peer
1814 * @mdev: DRBD device.
1816 int drbd_send_state(struct drbd_conf *mdev)
1818 struct socket *sock;
1822 /* Grab state lock so we wont send state if we're in the middle
1823 * of a cluster wide state change on another thread */
1824 drbd_state_lock(mdev);
1826 mutex_lock(&mdev->data.mutex);
1828 p.state = cpu_to_be32(mdev->state.i); /* Within the send mutex */
1829 sock = mdev->data.socket;
1831 if (likely(sock != NULL)) {
1832 ok = _drbd_send_cmd(mdev, sock, P_STATE,
1833 (struct p_header *)&p, sizeof(p), 0);
1836 mutex_unlock(&mdev->data.mutex);
1838 drbd_state_unlock(mdev);
1842 int drbd_send_state_req(struct drbd_conf *mdev,
1843 union drbd_state mask, union drbd_state val)
1845 struct p_req_state p;
1847 p.mask = cpu_to_be32(mask.i);
1848 p.val = cpu_to_be32(val.i);
1850 return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_STATE_CHG_REQ,
1851 (struct p_header *)&p, sizeof(p));
1854 int drbd_send_sr_reply(struct drbd_conf *mdev, int retcode)
1856 struct p_req_state_reply p;
1858 p.retcode = cpu_to_be32(retcode);
1860 return drbd_send_cmd(mdev, USE_META_SOCKET, P_STATE_CHG_REPLY,
1861 (struct p_header *)&p, sizeof(p));
1864 int fill_bitmap_rle_bits(struct drbd_conf *mdev,
1865 struct p_compressed_bm *p,
1866 struct bm_xfer_ctx *c)
1868 struct bitstream bs;
1869 unsigned long plain_bits;
1876 /* may we use this feature? */
1877 if ((mdev->sync_conf.use_rle == 0) ||
1878 (mdev->agreed_pro_version < 90))
1881 if (c->bit_offset >= c->bm_bits)
1882 return 0; /* nothing to do. */
1884 /* use at most thus many bytes */
1885 bitstream_init(&bs, p->code, BM_PACKET_VLI_BYTES_MAX, 0);
1886 memset(p->code, 0, BM_PACKET_VLI_BYTES_MAX);
1887 /* plain bits covered in this code string */
1890 /* p->encoding & 0x80 stores whether the first run length is set.
1891 * bit offset is implicit.
1892 * start with toggle == 2 to be able to tell the first iteration */
1895 /* see how much plain bits we can stuff into one packet
1896 * using RLE and VLI. */
1898 tmp = (toggle == 0) ? _drbd_bm_find_next_zero(mdev, c->bit_offset)
1899 : _drbd_bm_find_next(mdev, c->bit_offset);
1902 rl = tmp - c->bit_offset;
1904 if (toggle == 2) { /* first iteration */
1906 /* the first checked bit was set,
1907 * store start value, */
1908 DCBP_set_start(p, 1);
1909 /* but skip encoding of zero run length */
1913 DCBP_set_start(p, 0);
1916 /* paranoia: catch zero runlength.
1917 * can only happen if bitmap is modified while we scan it. */
1919 dev_err(DEV, "unexpected zero runlength while encoding bitmap "
1920 "t:%u bo:%lu\n", toggle, c->bit_offset);
1924 bits = vli_encode_bits(&bs, rl);
1925 if (bits == -ENOBUFS) /* buffer full */
1928 dev_err(DEV, "error while encoding bitmap: %d\n", bits);
1934 c->bit_offset = tmp;
1935 } while (c->bit_offset < c->bm_bits);
1937 len = bs.cur.b - p->code + !!bs.cur.bit;
1939 if (plain_bits < (len << 3)) {
1940 /* incompressible with this method.
1941 * we need to rewind both word and bit position. */
1942 c->bit_offset -= plain_bits;
1943 bm_xfer_ctx_bit_to_word_offset(c);
1944 c->bit_offset = c->word_offset * BITS_PER_LONG;
1948 /* RLE + VLI was able to compress it just fine.
1949 * update c->word_offset. */
1950 bm_xfer_ctx_bit_to_word_offset(c);
1952 /* store pad_bits */
1953 DCBP_set_pad_bits(p, (8 - bs.cur.bit) & 0x7);
1958 enum { OK, FAILED, DONE }
1959 send_bitmap_rle_or_plain(struct drbd_conf *mdev,
1960 struct p_header *h, struct bm_xfer_ctx *c)
1962 struct p_compressed_bm *p = (void*)h;
1963 unsigned long num_words;
1967 len = fill_bitmap_rle_bits(mdev, p, c);
1973 DCBP_set_code(p, RLE_VLI_Bits);
1974 ok = _drbd_send_cmd(mdev, mdev->data.socket, P_COMPRESSED_BITMAP, h,
1975 sizeof(*p) + len, 0);
1978 c->bytes[0] += sizeof(*p) + len;
1980 if (c->bit_offset >= c->bm_bits)
1983 /* was not compressible.
1984 * send a buffer full of plain text bits instead. */
1985 num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset);
1986 len = num_words * sizeof(long);
1988 drbd_bm_get_lel(mdev, c->word_offset, num_words, (unsigned long*)h->payload);
1989 ok = _drbd_send_cmd(mdev, mdev->data.socket, P_BITMAP,
1990 h, sizeof(struct p_header) + len, 0);
1991 c->word_offset += num_words;
1992 c->bit_offset = c->word_offset * BITS_PER_LONG;
1995 c->bytes[1] += sizeof(struct p_header) + len;
1997 if (c->bit_offset > c->bm_bits)
1998 c->bit_offset = c->bm_bits;
2000 ok = ok ? ((len == 0) ? DONE : OK) : FAILED;
2003 INFO_bm_xfer_stats(mdev, "send", c);
2007 /* See the comment at receive_bitmap() */
2008 int _drbd_send_bitmap(struct drbd_conf *mdev)
2010 struct bm_xfer_ctx c;
2014 ERR_IF(!mdev->bitmap) return FALSE;
2016 /* maybe we should use some per thread scratch page,
2017 * and allocate that during initial device creation? */
2018 p = (struct p_header *) __get_free_page(GFP_NOIO);
2020 dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__);
2024 if (get_ldev(mdev)) {
2025 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
2026 dev_info(DEV, "Writing the whole bitmap, MDF_FullSync was set.\n");
2027 drbd_bm_set_all(mdev);
2028 if (drbd_bm_write(mdev)) {
2029 /* write_bm did fail! Leave full sync flag set in Meta P_DATA
2030 * but otherwise process as per normal - need to tell other
2031 * side that a full resync is required! */
2032 dev_err(DEV, "Failed to write bitmap to disk!\n");
2034 drbd_md_clear_flag(mdev, MDF_FULL_SYNC);
2041 c = (struct bm_xfer_ctx) {
2042 .bm_bits = drbd_bm_bits(mdev),
2043 .bm_words = drbd_bm_words(mdev),
2047 ret = send_bitmap_rle_or_plain(mdev, p, &c);
2048 } while (ret == OK);
2050 free_page((unsigned long) p);
2051 return (ret == DONE);
2054 int drbd_send_bitmap(struct drbd_conf *mdev)
2058 if (!drbd_get_data_sock(mdev))
2060 err = !_drbd_send_bitmap(mdev);
2061 drbd_put_data_sock(mdev);
2065 int drbd_send_b_ack(struct drbd_conf *mdev, u32 barrier_nr, u32 set_size)
2068 struct p_barrier_ack p;
2070 p.barrier = barrier_nr;
2071 p.set_size = cpu_to_be32(set_size);
2073 if (mdev->state.conn < C_CONNECTED)
2075 ok = drbd_send_cmd(mdev, USE_META_SOCKET, P_BARRIER_ACK,
2076 (struct p_header *)&p, sizeof(p));
2081 * _drbd_send_ack() - Sends an ack packet
2082 * @mdev: DRBD device.
2083 * @cmd: Packet command code.
2084 * @sector: sector, needs to be in big endian byte order
2085 * @blksize: size in byte, needs to be in big endian byte order
2086 * @block_id: Id, big endian byte order
2088 static int _drbd_send_ack(struct drbd_conf *mdev, enum drbd_packets cmd,
2094 struct p_block_ack p;
2097 p.block_id = block_id;
2098 p.blksize = blksize;
2099 p.seq_num = cpu_to_be32(atomic_add_return(1, &mdev->packet_seq));
2101 if (!mdev->meta.socket || mdev->state.conn < C_CONNECTED)
2103 ok = drbd_send_cmd(mdev, USE_META_SOCKET, cmd,
2104 (struct p_header *)&p, sizeof(p));
2108 int drbd_send_ack_dp(struct drbd_conf *mdev, enum drbd_packets cmd,
2111 const int header_size = sizeof(struct p_data)
2112 - sizeof(struct p_header);
2113 int data_size = ((struct p_header *)dp)->length - header_size;
2115 return _drbd_send_ack(mdev, cmd, dp->sector, cpu_to_be32(data_size),
2119 int drbd_send_ack_rp(struct drbd_conf *mdev, enum drbd_packets cmd,
2120 struct p_block_req *rp)
2122 return _drbd_send_ack(mdev, cmd, rp->sector, rp->blksize, rp->block_id);
2126 * drbd_send_ack() - Sends an ack packet
2127 * @mdev: DRBD device.
2128 * @cmd: Packet command code.
2131 int drbd_send_ack(struct drbd_conf *mdev,
2132 enum drbd_packets cmd, struct drbd_epoch_entry *e)
2134 return _drbd_send_ack(mdev, cmd,
2135 cpu_to_be64(e->sector),
2136 cpu_to_be32(e->size),
2140 /* This function misuses the block_id field to signal if the blocks
2141 * are is sync or not. */
2142 int drbd_send_ack_ex(struct drbd_conf *mdev, enum drbd_packets cmd,
2143 sector_t sector, int blksize, u64 block_id)
2145 return _drbd_send_ack(mdev, cmd,
2146 cpu_to_be64(sector),
2147 cpu_to_be32(blksize),
2148 cpu_to_be64(block_id));
2151 int drbd_send_drequest(struct drbd_conf *mdev, int cmd,
2152 sector_t sector, int size, u64 block_id)
2155 struct p_block_req p;
2157 p.sector = cpu_to_be64(sector);
2158 p.block_id = block_id;
2159 p.blksize = cpu_to_be32(size);
2161 ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, cmd,
2162 (struct p_header *)&p, sizeof(p));
2166 int drbd_send_drequest_csum(struct drbd_conf *mdev,
2167 sector_t sector, int size,
2168 void *digest, int digest_size,
2169 enum drbd_packets cmd)
2172 struct p_block_req p;
2174 p.sector = cpu_to_be64(sector);
2175 p.block_id = BE_DRBD_MAGIC + 0xbeef;
2176 p.blksize = cpu_to_be32(size);
2178 p.head.magic = BE_DRBD_MAGIC;
2179 p.head.command = cpu_to_be16(cmd);
2180 p.head.length = cpu_to_be16(sizeof(p) - sizeof(struct p_header) + digest_size);
2182 mutex_lock(&mdev->data.mutex);
2184 ok = (sizeof(p) == drbd_send(mdev, mdev->data.socket, &p, sizeof(p), 0));
2185 ok = ok && (digest_size == drbd_send(mdev, mdev->data.socket, digest, digest_size, 0));
2187 mutex_unlock(&mdev->data.mutex);
2192 int drbd_send_ov_request(struct drbd_conf *mdev, sector_t sector, int size)
2195 struct p_block_req p;
2197 p.sector = cpu_to_be64(sector);
2198 p.block_id = BE_DRBD_MAGIC + 0xbabe;
2199 p.blksize = cpu_to_be32(size);
2201 ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_OV_REQUEST,
2202 (struct p_header *)&p, sizeof(p));
2206 static int drbd_send_delay_probe(struct drbd_conf *mdev, struct drbd_socket *ds)
2208 struct p_delay_probe dp;
2212 mutex_lock(&ds->mutex);
2213 if (likely(ds->socket)) {
2214 do_gettimeofday(&now);
2215 offset = now.tv_usec - mdev->dps_time.tv_usec +
2216 (now.tv_sec - mdev->dps_time.tv_sec) * 1000000;
2217 dp.seq_num = cpu_to_be32(mdev->delay_seq);
2218 dp.offset = cpu_to_be32(offset);
2220 ok = _drbd_send_cmd(mdev, ds->socket, P_DELAY_PROBE,
2221 (struct p_header *)&dp, sizeof(dp), 0);
2223 mutex_unlock(&ds->mutex);
2228 static int drbd_send_delay_probes(struct drbd_conf *mdev)
2233 do_gettimeofday(&mdev->dps_time);
2234 ok = drbd_send_delay_probe(mdev, &mdev->meta);
2235 ok = ok && drbd_send_delay_probe(mdev, &mdev->data);
2237 mdev->dp_volume_last = mdev->send_cnt;
2238 mod_timer(&mdev->delay_probe_timer, jiffies + mdev->sync_conf.dp_interval * HZ / 10);
2243 /* called on sndtimeo
2244 * returns FALSE if we should retry,
2245 * TRUE if we think connection is dead
2247 static int we_should_drop_the_connection(struct drbd_conf *mdev, struct socket *sock)
2250 /* long elapsed = (long)(jiffies - mdev->last_received); */
2252 drop_it = mdev->meta.socket == sock
2253 || !mdev->asender.task
2254 || get_t_state(&mdev->asender) != Running
2255 || mdev->state.conn < C_CONNECTED;
2260 drop_it = !--mdev->ko_count;
2262 dev_err(DEV, "[%s/%d] sock_sendmsg time expired, ko = %u\n",
2263 current->comm, current->pid, mdev->ko_count);
2267 return drop_it; /* && (mdev->state == R_PRIMARY) */;
2270 /* The idea of sendpage seems to be to put some kind of reference
2271 * to the page into the skb, and to hand it over to the NIC. In
2272 * this process get_page() gets called.
2274 * As soon as the page was really sent over the network put_page()
2275 * gets called by some part of the network layer. [ NIC driver? ]
2277 * [ get_page() / put_page() increment/decrement the count. If count
2278 * reaches 0 the page will be freed. ]
2280 * This works nicely with pages from FSs.
2281 * But this means that in protocol A we might signal IO completion too early!
2283 * In order not to corrupt data during a resync we must make sure
2284 * that we do not reuse our own buffer pages (EEs) to early, therefore
2285 * we have the net_ee list.
2287 * XFS seems to have problems, still, it submits pages with page_count == 0!
2288 * As a workaround, we disable sendpage on pages
2289 * with page_count == 0 or PageSlab.
2291 static int _drbd_no_send_page(struct drbd_conf *mdev, struct page *page,
2292 int offset, size_t size)
2294 int sent = drbd_send(mdev, mdev->data.socket, kmap(page) + offset, size, 0);
2297 mdev->send_cnt += size>>9;
2298 return sent == size;
2301 static int _drbd_send_page(struct drbd_conf *mdev, struct page *page,
2302 int offset, size_t size)
2304 mm_segment_t oldfs = get_fs();
2308 /* e.g. XFS meta- & log-data is in slab pages, which have a
2309 * page_count of 0 and/or have PageSlab() set.
2310 * we cannot use send_page for those, as that does get_page();
2311 * put_page(); and would cause either a VM_BUG directly, or
2312 * __page_cache_release a page that would actually still be referenced
2313 * by someone, leading to some obscure delayed Oops somewhere else. */
2314 if (disable_sendpage || (page_count(page) < 1) || PageSlab(page))
2315 return _drbd_no_send_page(mdev, page, offset, size);
2317 drbd_update_congested(mdev);
2320 sent = mdev->data.socket->ops->sendpage(mdev->data.socket, page,
2323 if (sent == -EAGAIN) {
2324 if (we_should_drop_the_connection(mdev,
2331 dev_warn(DEV, "%s: size=%d len=%d sent=%d\n",
2332 __func__, (int)size, len, sent);
2337 } while (len > 0 /* THINK && mdev->cstate >= C_CONNECTED*/);
2339 clear_bit(NET_CONGESTED, &mdev->flags);
2343 mdev->send_cnt += size>>9;
2347 static int _drbd_send_bio(struct drbd_conf *mdev, struct bio *bio)
2349 struct bio_vec *bvec;
2351 __bio_for_each_segment(bvec, bio, i, 0) {
2352 if (!_drbd_no_send_page(mdev, bvec->bv_page,
2353 bvec->bv_offset, bvec->bv_len))
2359 static int _drbd_send_zc_bio(struct drbd_conf *mdev, struct bio *bio)
2361 struct bio_vec *bvec;
2363 __bio_for_each_segment(bvec, bio, i, 0) {
2364 if (!_drbd_send_page(mdev, bvec->bv_page,
2365 bvec->bv_offset, bvec->bv_len))
2372 static int _drbd_send_zc_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e)
2374 struct page *page = e->pages;
2375 unsigned len = e->size;
2376 page_chain_for_each(page) {
2377 unsigned l = min_t(unsigned, len, PAGE_SIZE);
2378 if (!_drbd_send_page(mdev, page, 0, l))
2385 static void consider_delay_probes(struct drbd_conf *mdev)
2387 if (mdev->state.conn != C_SYNC_SOURCE || mdev->agreed_pro_version < 93)
2390 if (mdev->dp_volume_last + mdev->sync_conf.dp_volume * 2 < mdev->send_cnt)
2391 drbd_send_delay_probes(mdev);
2394 static int w_delay_probes(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
2396 if (!cancel && mdev->state.conn == C_SYNC_SOURCE)
2397 drbd_send_delay_probes(mdev);
2402 static void delay_probe_timer_fn(unsigned long data)
2404 struct drbd_conf *mdev = (struct drbd_conf *) data;
2406 if (list_empty(&mdev->delay_probe_work.list))
2407 drbd_queue_work(&mdev->data.work, &mdev->delay_probe_work);
2410 /* Used to send write requests
2411 * R_PRIMARY -> Peer (P_DATA)
2413 int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req)
2417 unsigned int dp_flags = 0;
2421 if (!drbd_get_data_sock(mdev))
2424 dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_w_tfm) ?
2425 crypto_hash_digestsize(mdev->integrity_w_tfm) : 0;
2427 p.head.magic = BE_DRBD_MAGIC;
2428 p.head.command = cpu_to_be16(P_DATA);
2430 cpu_to_be16(sizeof(p) - sizeof(struct p_header) + dgs + req->size);
2432 p.sector = cpu_to_be64(req->sector);
2433 p.block_id = (unsigned long)req;
2434 p.seq_num = cpu_to_be32(req->seq_num =
2435 atomic_add_return(1, &mdev->packet_seq));
2438 /* NOTE: no need to check if barriers supported here as we would
2439 * not pass the test in make_request_common in that case
2441 if (bio_rw_flagged(req->master_bio, BIO_RW_BARRIER)) {
2442 dev_err(DEV, "ASSERT FAILED would have set DP_HARDBARRIER\n");
2443 /* dp_flags |= DP_HARDBARRIER; */
2445 if (bio_rw_flagged(req->master_bio, BIO_RW_SYNCIO))
2446 dp_flags |= DP_RW_SYNC;
2447 /* for now handle SYNCIO and UNPLUG
2448 * as if they still were one and the same flag */
2449 if (bio_rw_flagged(req->master_bio, BIO_RW_UNPLUG))
2450 dp_flags |= DP_RW_SYNC;
2451 if (mdev->state.conn >= C_SYNC_SOURCE &&
2452 mdev->state.conn <= C_PAUSED_SYNC_T)
2453 dp_flags |= DP_MAY_SET_IN_SYNC;
2455 p.dp_flags = cpu_to_be32(dp_flags);
2456 set_bit(UNPLUG_REMOTE, &mdev->flags);
2458 drbd_send(mdev, mdev->data.socket, &p, sizeof(p), MSG_MORE));
2460 dgb = mdev->int_dig_out;
2461 drbd_csum_bio(mdev, mdev->integrity_w_tfm, req->master_bio, dgb);
2462 ok = drbd_send(mdev, mdev->data.socket, dgb, dgs, MSG_MORE);
2465 if (mdev->net_conf->wire_protocol == DRBD_PROT_A)
2466 ok = _drbd_send_bio(mdev, req->master_bio);
2468 ok = _drbd_send_zc_bio(mdev, req->master_bio);
2471 drbd_put_data_sock(mdev);
2474 consider_delay_probes(mdev);
2479 /* answer packet, used to send data back for read requests:
2480 * Peer -> (diskless) R_PRIMARY (P_DATA_REPLY)
2481 * C_SYNC_SOURCE -> C_SYNC_TARGET (P_RS_DATA_REPLY)
2483 int drbd_send_block(struct drbd_conf *mdev, enum drbd_packets cmd,
2484 struct drbd_epoch_entry *e)
2491 dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_w_tfm) ?
2492 crypto_hash_digestsize(mdev->integrity_w_tfm) : 0;
2494 p.head.magic = BE_DRBD_MAGIC;
2495 p.head.command = cpu_to_be16(cmd);
2497 cpu_to_be16(sizeof(p) - sizeof(struct p_header) + dgs + e->size);
2499 p.sector = cpu_to_be64(e->sector);
2500 p.block_id = e->block_id;
2501 /* p.seq_num = 0; No sequence numbers here.. */
2503 /* Only called by our kernel thread.
2504 * This one may be interrupted by DRBD_SIG and/or DRBD_SIGKILL
2505 * in response to admin command or module unload.
2507 if (!drbd_get_data_sock(mdev))
2510 ok = sizeof(p) == drbd_send(mdev, mdev->data.socket, &p,
2511 sizeof(p), MSG_MORE);
2513 dgb = mdev->int_dig_out;
2514 drbd_csum_ee(mdev, mdev->integrity_w_tfm, e, dgb);
2515 ok = drbd_send(mdev, mdev->data.socket, dgb, dgs, MSG_MORE);
2518 ok = _drbd_send_zc_ee(mdev, e);
2520 drbd_put_data_sock(mdev);
2523 consider_delay_probes(mdev);
2529 drbd_send distinguishes two cases:
2531 Packets sent via the data socket "sock"
2532 and packets sent via the meta data socket "msock"
2535 -----------------+-------------------------+------------------------------
2536 timeout conf.timeout / 2 conf.timeout / 2
2537 timeout action send a ping via msock Abort communication
2538 and close all sockets
2542 * you must have down()ed the appropriate [m]sock_mutex elsewhere!
2544 int drbd_send(struct drbd_conf *mdev, struct socket *sock,
2545 void *buf, size_t size, unsigned msg_flags)
2554 /* THINK if (signal_pending) return ... ? */
2559 msg.msg_name = NULL;
2560 msg.msg_namelen = 0;
2561 msg.msg_control = NULL;
2562 msg.msg_controllen = 0;
2563 msg.msg_flags = msg_flags | MSG_NOSIGNAL;
2565 if (sock == mdev->data.socket) {
2566 mdev->ko_count = mdev->net_conf->ko_count;
2567 drbd_update_congested(mdev);
2571 * tcp_sendmsg does _not_ use its size parameter at all ?
2573 * -EAGAIN on timeout, -EINTR on signal.
2576 * do we need to block DRBD_SIG if sock == &meta.socket ??
2577 * otherwise wake_asender() might interrupt some send_*Ack !
2579 rv = kernel_sendmsg(sock, &msg, &iov, 1, size);
2580 if (rv == -EAGAIN) {
2581 if (we_should_drop_the_connection(mdev, sock))
2588 flush_signals(current);
2596 } while (sent < size);
2598 if (sock == mdev->data.socket)
2599 clear_bit(NET_CONGESTED, &mdev->flags);
2602 if (rv != -EAGAIN) {
2603 dev_err(DEV, "%s_sendmsg returned %d\n",
2604 sock == mdev->meta.socket ? "msock" : "sock",
2606 drbd_force_state(mdev, NS(conn, C_BROKEN_PIPE));
2608 drbd_force_state(mdev, NS(conn, C_TIMEOUT));
2614 static int drbd_open(struct block_device *bdev, fmode_t mode)
2616 struct drbd_conf *mdev = bdev->bd_disk->private_data;
2617 unsigned long flags;
2620 spin_lock_irqsave(&mdev->req_lock, flags);
2621 /* to have a stable mdev->state.role
2622 * and no race with updating open_cnt */
2624 if (mdev->state.role != R_PRIMARY) {
2625 if (mode & FMODE_WRITE)
2627 else if (!allow_oos)
2633 spin_unlock_irqrestore(&mdev->req_lock, flags);
2638 static int drbd_release(struct gendisk *gd, fmode_t mode)
2640 struct drbd_conf *mdev = gd->private_data;
2645 static void drbd_unplug_fn(struct request_queue *q)
2647 struct drbd_conf *mdev = q->queuedata;
2650 spin_lock_irq(q->queue_lock);
2652 spin_unlock_irq(q->queue_lock);
2654 /* only if connected */
2655 spin_lock_irq(&mdev->req_lock);
2656 if (mdev->state.pdsk >= D_INCONSISTENT && mdev->state.conn >= C_CONNECTED) {
2657 D_ASSERT(mdev->state.role == R_PRIMARY);
2658 if (test_and_clear_bit(UNPLUG_REMOTE, &mdev->flags)) {
2659 /* add to the data.work queue,
2660 * unless already queued.
2661 * XXX this might be a good addition to drbd_queue_work
2662 * anyways, to detect "double queuing" ... */
2663 if (list_empty(&mdev->unplug_work.list))
2664 drbd_queue_work(&mdev->data.work,
2665 &mdev->unplug_work);
2668 spin_unlock_irq(&mdev->req_lock);
2670 if (mdev->state.disk >= D_INCONSISTENT)
2674 static void drbd_set_defaults(struct drbd_conf *mdev)
2676 mdev->sync_conf.after = DRBD_AFTER_DEF;
2677 mdev->sync_conf.rate = DRBD_RATE_DEF;
2678 mdev->sync_conf.al_extents = DRBD_AL_EXTENTS_DEF;
2679 mdev->state = (union drbd_state) {
2680 { .role = R_SECONDARY,
2682 .conn = C_STANDALONE,
2689 void drbd_init_set_defaults(struct drbd_conf *mdev)
2691 /* the memset(,0,) did most of this.
2692 * note: only assignments, no allocation in here */
2694 drbd_set_defaults(mdev);
2696 /* for now, we do NOT yet support it,
2697 * even though we start some framework
2698 * to eventually support barriers */
2699 set_bit(NO_BARRIER_SUPP, &mdev->flags);
2701 atomic_set(&mdev->ap_bio_cnt, 0);
2702 atomic_set(&mdev->ap_pending_cnt, 0);
2703 atomic_set(&mdev->rs_pending_cnt, 0);
2704 atomic_set(&mdev->unacked_cnt, 0);
2705 atomic_set(&mdev->local_cnt, 0);
2706 atomic_set(&mdev->net_cnt, 0);
2707 atomic_set(&mdev->packet_seq, 0);
2708 atomic_set(&mdev->pp_in_use, 0);
2709 atomic_set(&mdev->new_c_uuid, 0);
2711 mutex_init(&mdev->md_io_mutex);
2712 mutex_init(&mdev->data.mutex);
2713 mutex_init(&mdev->meta.mutex);
2714 sema_init(&mdev->data.work.s, 0);
2715 sema_init(&mdev->meta.work.s, 0);
2716 mutex_init(&mdev->state_mutex);
2718 spin_lock_init(&mdev->data.work.q_lock);
2719 spin_lock_init(&mdev->meta.work.q_lock);
2721 spin_lock_init(&mdev->al_lock);
2722 spin_lock_init(&mdev->req_lock);
2723 spin_lock_init(&mdev->peer_seq_lock);
2724 spin_lock_init(&mdev->epoch_lock);
2726 INIT_LIST_HEAD(&mdev->active_ee);
2727 INIT_LIST_HEAD(&mdev->sync_ee);
2728 INIT_LIST_HEAD(&mdev->done_ee);
2729 INIT_LIST_HEAD(&mdev->read_ee);
2730 INIT_LIST_HEAD(&mdev->net_ee);
2731 INIT_LIST_HEAD(&mdev->resync_reads);
2732 INIT_LIST_HEAD(&mdev->data.work.q);
2733 INIT_LIST_HEAD(&mdev->meta.work.q);
2734 INIT_LIST_HEAD(&mdev->resync_work.list);
2735 INIT_LIST_HEAD(&mdev->unplug_work.list);
2736 INIT_LIST_HEAD(&mdev->md_sync_work.list);
2737 INIT_LIST_HEAD(&mdev->bm_io_work.w.list);
2738 INIT_LIST_HEAD(&mdev->delay_probes);
2739 INIT_LIST_HEAD(&mdev->delay_probe_work.list);
2740 INIT_LIST_HEAD(&mdev->uuid_work.list);
2742 mdev->resync_work.cb = w_resync_inactive;
2743 mdev->unplug_work.cb = w_send_write_hint;
2744 mdev->md_sync_work.cb = w_md_sync;
2745 mdev->bm_io_work.w.cb = w_bitmap_io;
2746 mdev->delay_probe_work.cb = w_delay_probes;
2747 mdev->uuid_work.cb = w_new_current_uuid;
2748 init_timer(&mdev->resync_timer);
2749 init_timer(&mdev->md_sync_timer);
2750 init_timer(&mdev->delay_probe_timer);
2751 mdev->resync_timer.function = resync_timer_fn;
2752 mdev->resync_timer.data = (unsigned long) mdev;
2753 mdev->md_sync_timer.function = md_sync_timer_fn;
2754 mdev->md_sync_timer.data = (unsigned long) mdev;
2755 mdev->delay_probe_timer.function = delay_probe_timer_fn;
2756 mdev->delay_probe_timer.data = (unsigned long) mdev;
2759 init_waitqueue_head(&mdev->misc_wait);
2760 init_waitqueue_head(&mdev->state_wait);
2761 init_waitqueue_head(&mdev->ee_wait);
2762 init_waitqueue_head(&mdev->al_wait);
2763 init_waitqueue_head(&mdev->seq_wait);
2765 drbd_thread_init(mdev, &mdev->receiver, drbdd_init);
2766 drbd_thread_init(mdev, &mdev->worker, drbd_worker);
2767 drbd_thread_init(mdev, &mdev->asender, drbd_asender);
2769 mdev->agreed_pro_version = PRO_VERSION_MAX;
2770 mdev->write_ordering = WO_bio_barrier;
2771 mdev->resync_wenr = LC_FREE;
2774 void drbd_mdev_cleanup(struct drbd_conf *mdev)
2776 if (mdev->receiver.t_state != None)
2777 dev_err(DEV, "ASSERT FAILED: receiver t_state == %d expected 0.\n",
2778 mdev->receiver.t_state);
2780 /* no need to lock it, I'm the only thread alive */
2781 if (atomic_read(&mdev->current_epoch->epoch_size) != 0)
2782 dev_err(DEV, "epoch_size:%d\n", atomic_read(&mdev->current_epoch->epoch_size));
2793 mdev->rs_mark_left =
2794 mdev->rs_mark_time = 0;
2795 D_ASSERT(mdev->net_conf == NULL);
2797 drbd_set_my_capacity(mdev, 0);
2799 /* maybe never allocated. */
2800 drbd_bm_resize(mdev, 0, 1);
2801 drbd_bm_cleanup(mdev);
2804 drbd_free_resources(mdev);
2807 * currently we drbd_init_ee only on module load, so
2808 * we may do drbd_release_ee only on module unload!
2810 D_ASSERT(list_empty(&mdev->active_ee));
2811 D_ASSERT(list_empty(&mdev->sync_ee));
2812 D_ASSERT(list_empty(&mdev->done_ee));
2813 D_ASSERT(list_empty(&mdev->read_ee));
2814 D_ASSERT(list_empty(&mdev->net_ee));
2815 D_ASSERT(list_empty(&mdev->resync_reads));
2816 D_ASSERT(list_empty(&mdev->data.work.q));
2817 D_ASSERT(list_empty(&mdev->meta.work.q));
2818 D_ASSERT(list_empty(&mdev->resync_work.list));
2819 D_ASSERT(list_empty(&mdev->unplug_work.list));
2824 static void drbd_destroy_mempools(void)
2828 while (drbd_pp_pool) {
2829 page = drbd_pp_pool;
2830 drbd_pp_pool = (struct page *)page_private(page);
2835 /* D_ASSERT(atomic_read(&drbd_pp_vacant)==0); */
2837 if (drbd_ee_mempool)
2838 mempool_destroy(drbd_ee_mempool);
2839 if (drbd_request_mempool)
2840 mempool_destroy(drbd_request_mempool);
2842 kmem_cache_destroy(drbd_ee_cache);
2843 if (drbd_request_cache)
2844 kmem_cache_destroy(drbd_request_cache);
2845 if (drbd_bm_ext_cache)
2846 kmem_cache_destroy(drbd_bm_ext_cache);
2847 if (drbd_al_ext_cache)
2848 kmem_cache_destroy(drbd_al_ext_cache);
2850 drbd_ee_mempool = NULL;
2851 drbd_request_mempool = NULL;
2852 drbd_ee_cache = NULL;
2853 drbd_request_cache = NULL;
2854 drbd_bm_ext_cache = NULL;
2855 drbd_al_ext_cache = NULL;
2860 static int drbd_create_mempools(void)
2863 const int number = (DRBD_MAX_SEGMENT_SIZE/PAGE_SIZE) * minor_count;
2866 /* prepare our caches and mempools */
2867 drbd_request_mempool = NULL;
2868 drbd_ee_cache = NULL;
2869 drbd_request_cache = NULL;
2870 drbd_bm_ext_cache = NULL;
2871 drbd_al_ext_cache = NULL;
2872 drbd_pp_pool = NULL;
2875 drbd_request_cache = kmem_cache_create(
2876 "drbd_req", sizeof(struct drbd_request), 0, 0, NULL);
2877 if (drbd_request_cache == NULL)
2880 drbd_ee_cache = kmem_cache_create(
2881 "drbd_ee", sizeof(struct drbd_epoch_entry), 0, 0, NULL);
2882 if (drbd_ee_cache == NULL)
2885 drbd_bm_ext_cache = kmem_cache_create(
2886 "drbd_bm", sizeof(struct bm_extent), 0, 0, NULL);
2887 if (drbd_bm_ext_cache == NULL)
2890 drbd_al_ext_cache = kmem_cache_create(
2891 "drbd_al", sizeof(struct lc_element), 0, 0, NULL);
2892 if (drbd_al_ext_cache == NULL)
2896 drbd_request_mempool = mempool_create(number,
2897 mempool_alloc_slab, mempool_free_slab, drbd_request_cache);
2898 if (drbd_request_mempool == NULL)
2901 drbd_ee_mempool = mempool_create(number,
2902 mempool_alloc_slab, mempool_free_slab, drbd_ee_cache);
2903 if (drbd_request_mempool == NULL)
2906 /* drbd's page pool */
2907 spin_lock_init(&drbd_pp_lock);
2909 for (i = 0; i < number; i++) {
2910 page = alloc_page(GFP_HIGHUSER);
2913 set_page_private(page, (unsigned long)drbd_pp_pool);
2914 drbd_pp_pool = page;
2916 drbd_pp_vacant = number;
2921 drbd_destroy_mempools(); /* in case we allocated some */
2925 static int drbd_notify_sys(struct notifier_block *this, unsigned long code,
2928 /* just so we have it. you never know what interesting things we
2929 * might want to do here some day...
2935 static struct notifier_block drbd_notifier = {
2936 .notifier_call = drbd_notify_sys,
2939 static void drbd_release_ee_lists(struct drbd_conf *mdev)
2943 rr = drbd_release_ee(mdev, &mdev->active_ee);
2945 dev_err(DEV, "%d EEs in active list found!\n", rr);
2947 rr = drbd_release_ee(mdev, &mdev->sync_ee);
2949 dev_err(DEV, "%d EEs in sync list found!\n", rr);
2951 rr = drbd_release_ee(mdev, &mdev->read_ee);
2953 dev_err(DEV, "%d EEs in read list found!\n", rr);
2955 rr = drbd_release_ee(mdev, &mdev->done_ee);
2957 dev_err(DEV, "%d EEs in done list found!\n", rr);
2959 rr = drbd_release_ee(mdev, &mdev->net_ee);
2961 dev_err(DEV, "%d EEs in net list found!\n", rr);
2964 /* caution. no locking.
2965 * currently only used from module cleanup code. */
2966 static void drbd_delete_device(unsigned int minor)
2968 struct drbd_conf *mdev = minor_to_mdev(minor);
2973 /* paranoia asserts */
2974 if (mdev->open_cnt != 0)
2975 dev_err(DEV, "open_cnt = %d in %s:%u", mdev->open_cnt,
2976 __FILE__ , __LINE__);
2978 ERR_IF (!list_empty(&mdev->data.work.q)) {
2979 struct list_head *lp;
2980 list_for_each(lp, &mdev->data.work.q) {
2981 dev_err(DEV, "lp = %p\n", lp);
2984 /* end paranoia asserts */
2986 del_gendisk(mdev->vdisk);
2988 /* cleanup stuff that may have been allocated during
2989 * device (re-)configuration or state changes */
2991 if (mdev->this_bdev)
2992 bdput(mdev->this_bdev);
2994 drbd_free_resources(mdev);
2996 drbd_release_ee_lists(mdev);
2998 /* should be free'd on disconnect? */
2999 kfree(mdev->ee_hash);
3001 mdev->ee_hash_s = 0;
3002 mdev->ee_hash = NULL;
3005 lc_destroy(mdev->act_log);
3006 lc_destroy(mdev->resync);
3008 kfree(mdev->p_uuid);
3009 /* mdev->p_uuid = NULL; */
3011 kfree(mdev->int_dig_out);
3012 kfree(mdev->int_dig_in);
3013 kfree(mdev->int_dig_vv);
3015 /* cleanup the rest that has been
3016 * allocated from drbd_new_device
3017 * and actually free the mdev itself */
3018 drbd_free_mdev(mdev);
3021 static void drbd_cleanup(void)
3025 unregister_reboot_notifier(&drbd_notifier);
3031 remove_proc_entry("drbd", NULL);
3034 drbd_delete_device(i);
3035 drbd_destroy_mempools();
3040 unregister_blkdev(DRBD_MAJOR, "drbd");
3042 printk(KERN_INFO "drbd: module cleanup done.\n");
3046 * drbd_congested() - Callback for pdflush
3047 * @congested_data: User data
3048 * @bdi_bits: Bits pdflush is currently interested in
3050 * Returns 1<<BDI_async_congested and/or 1<<BDI_sync_congested if we are congested.
3052 static int drbd_congested(void *congested_data, int bdi_bits)
3054 struct drbd_conf *mdev = congested_data;
3055 struct request_queue *q;
3059 if (!__inc_ap_bio_cond(mdev)) {
3060 /* DRBD has frozen IO */
3066 if (get_ldev(mdev)) {
3067 q = bdev_get_queue(mdev->ldev->backing_bdev);
3068 r = bdi_congested(&q->backing_dev_info, bdi_bits);
3074 if (bdi_bits & (1 << BDI_async_congested) && test_bit(NET_CONGESTED, &mdev->flags)) {
3075 r |= (1 << BDI_async_congested);
3076 reason = reason == 'b' ? 'a' : 'n';
3080 mdev->congestion_reason = reason;
3084 struct drbd_conf *drbd_new_device(unsigned int minor)
3086 struct drbd_conf *mdev;
3087 struct gendisk *disk;
3088 struct request_queue *q;
3090 /* GFP_KERNEL, we are outside of all write-out paths */
3091 mdev = kzalloc(sizeof(struct drbd_conf), GFP_KERNEL);
3094 if (!zalloc_cpumask_var(&mdev->cpu_mask, GFP_KERNEL))
3095 goto out_no_cpumask;
3097 mdev->minor = minor;
3099 drbd_init_set_defaults(mdev);
3101 q = blk_alloc_queue(GFP_KERNEL);
3105 q->queuedata = mdev;
3107 disk = alloc_disk(1);
3112 set_disk_ro(disk, TRUE);
3115 disk->major = DRBD_MAJOR;
3116 disk->first_minor = minor;
3117 disk->fops = &drbd_ops;
3118 sprintf(disk->disk_name, "drbd%d", minor);
3119 disk->private_data = mdev;
3121 mdev->this_bdev = bdget(MKDEV(DRBD_MAJOR, minor));
3122 /* we have no partitions. we contain only ourselves. */
3123 mdev->this_bdev->bd_contains = mdev->this_bdev;
3125 q->backing_dev_info.congested_fn = drbd_congested;
3126 q->backing_dev_info.congested_data = mdev;
3128 blk_queue_make_request(q, drbd_make_request_26);
3129 blk_queue_max_segment_size(q, DRBD_MAX_SEGMENT_SIZE);
3130 blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
3131 blk_queue_merge_bvec(q, drbd_merge_bvec);
3132 q->queue_lock = &mdev->req_lock; /* needed since we use */
3133 /* plugging on a queue, that actually has no requests! */
3134 q->unplug_fn = drbd_unplug_fn;
3136 mdev->md_io_page = alloc_page(GFP_KERNEL);
3137 if (!mdev->md_io_page)
3138 goto out_no_io_page;
3140 if (drbd_bm_init(mdev))
3142 /* no need to lock access, we are still initializing this minor device. */
3146 mdev->app_reads_hash = kzalloc(APP_R_HSIZE*sizeof(void *), GFP_KERNEL);
3147 if (!mdev->app_reads_hash)
3148 goto out_no_app_reads;
3150 mdev->current_epoch = kzalloc(sizeof(struct drbd_epoch), GFP_KERNEL);
3151 if (!mdev->current_epoch)
3154 INIT_LIST_HEAD(&mdev->current_epoch->list);
3159 /* out_whatever_else:
3160 kfree(mdev->current_epoch); */
3162 kfree(mdev->app_reads_hash);
3166 drbd_bm_cleanup(mdev);
3168 __free_page(mdev->md_io_page);
3172 blk_cleanup_queue(q);
3174 free_cpumask_var(mdev->cpu_mask);
3180 /* counterpart of drbd_new_device.
3181 * last part of drbd_delete_device. */
3182 void drbd_free_mdev(struct drbd_conf *mdev)
3184 kfree(mdev->current_epoch);
3185 kfree(mdev->app_reads_hash);
3187 if (mdev->bitmap) /* should no longer be there. */
3188 drbd_bm_cleanup(mdev);
3189 __free_page(mdev->md_io_page);
3190 put_disk(mdev->vdisk);
3191 blk_cleanup_queue(mdev->rq_queue);
3192 free_cpumask_var(mdev->cpu_mask);
3197 int __init drbd_init(void)
3201 if (sizeof(struct p_handshake) != 80) {
3203 "drbd: never change the size or layout "
3204 "of the HandShake packet.\n");
3208 if (1 > minor_count || minor_count > 255) {
3210 "drbd: invalid minor_count (%d)\n", minor_count);
3218 err = drbd_nl_init();
3222 err = register_blkdev(DRBD_MAJOR, "drbd");
3225 "drbd: unable to register block device major %d\n",
3230 register_reboot_notifier(&drbd_notifier);
3233 * allocate all necessary structs
3237 init_waitqueue_head(&drbd_pp_wait);
3239 drbd_proc = NULL; /* play safe for drbd_cleanup */
3240 minor_table = kzalloc(sizeof(struct drbd_conf *)*minor_count,
3245 err = drbd_create_mempools();
3249 drbd_proc = proc_create_data("drbd", S_IFREG | S_IRUGO , NULL, &drbd_proc_fops, NULL);
3251 printk(KERN_ERR "drbd: unable to register proc file\n");
3255 rwlock_init(&global_state_lock);
3257 printk(KERN_INFO "drbd: initialized. "
3258 "Version: " REL_VERSION " (api:%d/proto:%d-%d)\n",
3259 API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX);
3260 printk(KERN_INFO "drbd: %s\n", drbd_buildtag());
3261 printk(KERN_INFO "drbd: registered as block device major %d\n",
3263 printk(KERN_INFO "drbd: minor_table @ 0x%p\n", minor_table);
3265 return 0; /* Success! */
3270 /* currently always the case */
3271 printk(KERN_ERR "drbd: ran out of memory\n");
3273 printk(KERN_ERR "drbd: initialization failure\n");
3277 void drbd_free_bc(struct drbd_backing_dev *ldev)
3282 bd_release(ldev->backing_bdev);
3283 bd_release(ldev->md_bdev);
3285 fput(ldev->lo_file);
3286 fput(ldev->md_file);
3291 void drbd_free_sock(struct drbd_conf *mdev)
3293 if (mdev->data.socket) {
3294 mutex_lock(&mdev->data.mutex);
3295 kernel_sock_shutdown(mdev->data.socket, SHUT_RDWR);
3296 sock_release(mdev->data.socket);
3297 mdev->data.socket = NULL;
3298 mutex_unlock(&mdev->data.mutex);
3300 if (mdev->meta.socket) {
3301 mutex_lock(&mdev->meta.mutex);
3302 kernel_sock_shutdown(mdev->meta.socket, SHUT_RDWR);
3303 sock_release(mdev->meta.socket);
3304 mdev->meta.socket = NULL;
3305 mutex_unlock(&mdev->meta.mutex);
3310 void drbd_free_resources(struct drbd_conf *mdev)
3312 crypto_free_hash(mdev->csums_tfm);
3313 mdev->csums_tfm = NULL;
3314 crypto_free_hash(mdev->verify_tfm);
3315 mdev->verify_tfm = NULL;
3316 crypto_free_hash(mdev->cram_hmac_tfm);
3317 mdev->cram_hmac_tfm = NULL;
3318 crypto_free_hash(mdev->integrity_w_tfm);
3319 mdev->integrity_w_tfm = NULL;
3320 crypto_free_hash(mdev->integrity_r_tfm);
3321 mdev->integrity_r_tfm = NULL;
3323 drbd_free_sock(mdev);
3326 drbd_free_bc(mdev->ldev);
3327 mdev->ldev = NULL;);
3330 /* meta data management */
3332 struct meta_data_on_disk {
3333 u64 la_size; /* last agreed size. */
3334 u64 uuid[UI_SIZE]; /* UUIDs. */
3337 u32 flags; /* MDF */
3340 u32 al_offset; /* offset to this block */
3341 u32 al_nr_extents; /* important for restoring the AL */
3342 /* `-- act_log->nr_elements <-- sync_conf.al_extents */
3343 u32 bm_offset; /* offset to the bitmap, from here */
3344 u32 bm_bytes_per_bit; /* BM_BLOCK_SIZE */
3345 u32 reserved_u32[4];
3350 * drbd_md_sync() - Writes the meta data super block if the MD_DIRTY flag bit is set
3351 * @mdev: DRBD device.
3353 void drbd_md_sync(struct drbd_conf *mdev)
3355 struct meta_data_on_disk *buffer;
3359 if (!test_and_clear_bit(MD_DIRTY, &mdev->flags))
3361 del_timer(&mdev->md_sync_timer);
3363 /* We use here D_FAILED and not D_ATTACHING because we try to write
3364 * metadata even if we detach due to a disk failure! */
3365 if (!get_ldev_if_state(mdev, D_FAILED))
3368 mutex_lock(&mdev->md_io_mutex);
3369 buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);
3370 memset(buffer, 0, 512);
3372 buffer->la_size = cpu_to_be64(drbd_get_capacity(mdev->this_bdev));
3373 for (i = UI_CURRENT; i < UI_SIZE; i++)
3374 buffer->uuid[i] = cpu_to_be64(mdev->ldev->md.uuid[i]);
3375 buffer->flags = cpu_to_be32(mdev->ldev->md.flags);
3376 buffer->magic = cpu_to_be32(DRBD_MD_MAGIC);
3378 buffer->md_size_sect = cpu_to_be32(mdev->ldev->md.md_size_sect);
3379 buffer->al_offset = cpu_to_be32(mdev->ldev->md.al_offset);
3380 buffer->al_nr_extents = cpu_to_be32(mdev->act_log->nr_elements);
3381 buffer->bm_bytes_per_bit = cpu_to_be32(BM_BLOCK_SIZE);
3382 buffer->device_uuid = cpu_to_be64(mdev->ldev->md.device_uuid);
3384 buffer->bm_offset = cpu_to_be32(mdev->ldev->md.bm_offset);
3386 D_ASSERT(drbd_md_ss__(mdev, mdev->ldev) == mdev->ldev->md.md_offset);
3387 sector = mdev->ldev->md.md_offset;
3389 if (drbd_md_sync_page_io(mdev, mdev->ldev, sector, WRITE)) {
3390 clear_bit(MD_DIRTY, &mdev->flags);
3392 /* this was a try anyways ... */
3393 dev_err(DEV, "meta data update failed!\n");
3395 drbd_chk_io_error(mdev, 1, TRUE);
3398 /* Update mdev->ldev->md.la_size_sect,
3399 * since we updated it on metadata. */
3400 mdev->ldev->md.la_size_sect = drbd_get_capacity(mdev->this_bdev);
3402 mutex_unlock(&mdev->md_io_mutex);
3407 * drbd_md_read() - Reads in the meta data super block
3408 * @mdev: DRBD device.
3409 * @bdev: Device from which the meta data should be read in.
3411 * Return 0 (NO_ERROR) on success, and an enum drbd_ret_codes in case
3412 * something goes wrong. Currently only: ERR_IO_MD_DISK, ERR_MD_INVALID.
3414 int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
3416 struct meta_data_on_disk *buffer;
3417 int i, rv = NO_ERROR;
3419 if (!get_ldev_if_state(mdev, D_ATTACHING))
3420 return ERR_IO_MD_DISK;
3422 mutex_lock(&mdev->md_io_mutex);
3423 buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);
3425 if (!drbd_md_sync_page_io(mdev, bdev, bdev->md.md_offset, READ)) {
3426 /* NOTE: cant do normal error processing here as this is
3427 called BEFORE disk is attached */
3428 dev_err(DEV, "Error while reading metadata.\n");
3429 rv = ERR_IO_MD_DISK;
3433 if (be32_to_cpu(buffer->magic) != DRBD_MD_MAGIC) {
3434 dev_err(DEV, "Error while reading metadata, magic not found.\n");
3435 rv = ERR_MD_INVALID;
3438 if (be32_to_cpu(buffer->al_offset) != bdev->md.al_offset) {
3439 dev_err(DEV, "unexpected al_offset: %d (expected %d)\n",
3440 be32_to_cpu(buffer->al_offset), bdev->md.al_offset);
3441 rv = ERR_MD_INVALID;
3444 if (be32_to_cpu(buffer->bm_offset) != bdev->md.bm_offset) {
3445 dev_err(DEV, "unexpected bm_offset: %d (expected %d)\n",
3446 be32_to_cpu(buffer->bm_offset), bdev->md.bm_offset);
3447 rv = ERR_MD_INVALID;
3450 if (be32_to_cpu(buffer->md_size_sect) != bdev->md.md_size_sect) {
3451 dev_err(DEV, "unexpected md_size: %u (expected %u)\n",
3452 be32_to_cpu(buffer->md_size_sect), bdev->md.md_size_sect);
3453 rv = ERR_MD_INVALID;
3457 if (be32_to_cpu(buffer->bm_bytes_per_bit) != BM_BLOCK_SIZE) {
3458 dev_err(DEV, "unexpected bm_bytes_per_bit: %u (expected %u)\n",
3459 be32_to_cpu(buffer->bm_bytes_per_bit), BM_BLOCK_SIZE);
3460 rv = ERR_MD_INVALID;
3464 bdev->md.la_size_sect = be64_to_cpu(buffer->la_size);
3465 for (i = UI_CURRENT; i < UI_SIZE; i++)
3466 bdev->md.uuid[i] = be64_to_cpu(buffer->uuid[i]);
3467 bdev->md.flags = be32_to_cpu(buffer->flags);
3468 mdev->sync_conf.al_extents = be32_to_cpu(buffer->al_nr_extents);
3469 bdev->md.device_uuid = be64_to_cpu(buffer->device_uuid);
3471 if (mdev->sync_conf.al_extents < 7)
3472 mdev->sync_conf.al_extents = 127;
3475 mutex_unlock(&mdev->md_io_mutex);
3482 * drbd_md_mark_dirty() - Mark meta data super block as dirty
3483 * @mdev: DRBD device.
3485 * Call this function if you change anything that should be written to
3486 * the meta-data super block. This function sets MD_DIRTY, and starts a
3487 * timer that ensures that within five seconds you have to call drbd_md_sync().
3489 void drbd_md_mark_dirty(struct drbd_conf *mdev)
3491 set_bit(MD_DIRTY, &mdev->flags);
3492 mod_timer(&mdev->md_sync_timer, jiffies + 5*HZ);
3496 static void drbd_uuid_move_history(struct drbd_conf *mdev) __must_hold(local)
3500 for (i = UI_HISTORY_START; i < UI_HISTORY_END; i++)
3501 mdev->ldev->md.uuid[i+1] = mdev->ldev->md.uuid[i];
3504 void _drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local)
3506 if (idx == UI_CURRENT) {
3507 if (mdev->state.role == R_PRIMARY)
3512 drbd_set_ed_uuid(mdev, val);
3515 mdev->ldev->md.uuid[idx] = val;
3516 drbd_md_mark_dirty(mdev);
3520 void drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local)
3522 if (mdev->ldev->md.uuid[idx]) {
3523 drbd_uuid_move_history(mdev);
3524 mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[idx];
3526 _drbd_uuid_set(mdev, idx, val);
3530 * drbd_uuid_new_current() - Creates a new current UUID
3531 * @mdev: DRBD device.
3533 * Creates a new current UUID, and rotates the old current UUID into
3534 * the bitmap slot. Causes an incremental resync upon next connect.
3536 void drbd_uuid_new_current(struct drbd_conf *mdev) __must_hold(local)
3540 dev_info(DEV, "Creating new current UUID\n");
3541 D_ASSERT(mdev->ldev->md.uuid[UI_BITMAP] == 0);
3542 mdev->ldev->md.uuid[UI_BITMAP] = mdev->ldev->md.uuid[UI_CURRENT];
3544 get_random_bytes(&val, sizeof(u64));
3545 _drbd_uuid_set(mdev, UI_CURRENT, val);
3548 void drbd_uuid_set_bm(struct drbd_conf *mdev, u64 val) __must_hold(local)
3550 if (mdev->ldev->md.uuid[UI_BITMAP] == 0 && val == 0)
3554 drbd_uuid_move_history(mdev);
3555 mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[UI_BITMAP];
3556 mdev->ldev->md.uuid[UI_BITMAP] = 0;
3558 if (mdev->ldev->md.uuid[UI_BITMAP])
3559 dev_warn(DEV, "bm UUID already set");
3561 mdev->ldev->md.uuid[UI_BITMAP] = val;
3562 mdev->ldev->md.uuid[UI_BITMAP] &= ~((u64)1);
3565 drbd_md_mark_dirty(mdev);
3569 * drbd_bmio_set_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
3570 * @mdev: DRBD device.
3572 * Sets all bits in the bitmap and writes the whole bitmap to stable storage.
3574 int drbd_bmio_set_n_write(struct drbd_conf *mdev)
3578 if (get_ldev_if_state(mdev, D_ATTACHING)) {
3579 drbd_md_set_flag(mdev, MDF_FULL_SYNC);
3581 drbd_bm_set_all(mdev);
3583 rv = drbd_bm_write(mdev);
3586 drbd_md_clear_flag(mdev, MDF_FULL_SYNC);
3597 * drbd_bmio_clear_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
3598 * @mdev: DRBD device.
3600 * Clears all bits in the bitmap and writes the whole bitmap to stable storage.
3602 int drbd_bmio_clear_n_write(struct drbd_conf *mdev)
3606 if (get_ldev_if_state(mdev, D_ATTACHING)) {
3607 drbd_bm_clear_all(mdev);
3608 rv = drbd_bm_write(mdev);
3615 static int w_bitmap_io(struct drbd_conf *mdev, struct drbd_work *w, int unused)
3617 struct bm_io_work *work = container_of(w, struct bm_io_work, w);
3620 D_ASSERT(atomic_read(&mdev->ap_bio_cnt) == 0);
3622 drbd_bm_lock(mdev, work->why);
3623 rv = work->io_fn(mdev);
3624 drbd_bm_unlock(mdev);
3626 clear_bit(BITMAP_IO, &mdev->flags);
3627 wake_up(&mdev->misc_wait);
3630 work->done(mdev, rv);
3632 clear_bit(BITMAP_IO_QUEUED, &mdev->flags);
3639 * drbd_queue_bitmap_io() - Queues an IO operation on the whole bitmap
3640 * @mdev: DRBD device.
3641 * @io_fn: IO callback to be called when bitmap IO is possible
3642 * @done: callback to be called after the bitmap IO was performed
3643 * @why: Descriptive text of the reason for doing the IO
3645 * While IO on the bitmap happens we freeze application IO thus we ensure
3646 * that drbd_set_out_of_sync() can not be called. This function MAY ONLY be
3647 * called from worker context. It MUST NOT be used while a previous such
3648 * work is still pending!
3650 void drbd_queue_bitmap_io(struct drbd_conf *mdev,
3651 int (*io_fn)(struct drbd_conf *),
3652 void (*done)(struct drbd_conf *, int),
3655 D_ASSERT(current == mdev->worker.task);
3657 D_ASSERT(!test_bit(BITMAP_IO_QUEUED, &mdev->flags));
3658 D_ASSERT(!test_bit(BITMAP_IO, &mdev->flags));
3659 D_ASSERT(list_empty(&mdev->bm_io_work.w.list));
3660 if (mdev->bm_io_work.why)
3661 dev_err(DEV, "FIXME going to queue '%s' but '%s' still pending?\n",
3662 why, mdev->bm_io_work.why);
3664 mdev->bm_io_work.io_fn = io_fn;
3665 mdev->bm_io_work.done = done;
3666 mdev->bm_io_work.why = why;
3668 set_bit(BITMAP_IO, &mdev->flags);
3669 if (atomic_read(&mdev->ap_bio_cnt) == 0) {
3670 if (list_empty(&mdev->bm_io_work.w.list)) {
3671 set_bit(BITMAP_IO_QUEUED, &mdev->flags);
3672 drbd_queue_work(&mdev->data.work, &mdev->bm_io_work.w);
3674 dev_err(DEV, "FIXME avoided double queuing bm_io_work\n");
3679 * drbd_bitmap_io() - Does an IO operation on the whole bitmap
3680 * @mdev: DRBD device.
3681 * @io_fn: IO callback to be called when bitmap IO is possible
3682 * @why: Descriptive text of the reason for doing the IO
3684 * freezes application IO while that the actual IO operations runs. This
3685 * functions MAY NOT be called from worker context.
3687 int drbd_bitmap_io(struct drbd_conf *mdev, int (*io_fn)(struct drbd_conf *), char *why)
3691 D_ASSERT(current != mdev->worker.task);
3693 drbd_suspend_io(mdev);
3695 drbd_bm_lock(mdev, why);
3697 drbd_bm_unlock(mdev);
3699 drbd_resume_io(mdev);
3704 void drbd_md_set_flag(struct drbd_conf *mdev, int flag) __must_hold(local)
3706 if ((mdev->ldev->md.flags & flag) != flag) {
3707 drbd_md_mark_dirty(mdev);
3708 mdev->ldev->md.flags |= flag;
3712 void drbd_md_clear_flag(struct drbd_conf *mdev, int flag) __must_hold(local)
3714 if ((mdev->ldev->md.flags & flag) != 0) {
3715 drbd_md_mark_dirty(mdev);
3716 mdev->ldev->md.flags &= ~flag;
3719 int drbd_md_test_flag(struct drbd_backing_dev *bdev, int flag)
3721 return (bdev->md.flags & flag) != 0;
3724 static void md_sync_timer_fn(unsigned long data)
3726 struct drbd_conf *mdev = (struct drbd_conf *) data;
3728 drbd_queue_work_front(&mdev->data.work, &mdev->md_sync_work);
3731 static int w_md_sync(struct drbd_conf *mdev, struct drbd_work *w, int unused)
3733 dev_warn(DEV, "md_sync_timer expired! Worker calls drbd_md_sync().\n");
3739 #ifdef CONFIG_DRBD_FAULT_INJECTION
3740 /* Fault insertion support including random number generator shamelessly
3741 * stolen from kernel/rcutorture.c */
3742 struct fault_random_state {
3743 unsigned long state;
3744 unsigned long count;
3747 #define FAULT_RANDOM_MULT 39916801 /* prime */
3748 #define FAULT_RANDOM_ADD 479001701 /* prime */
3749 #define FAULT_RANDOM_REFRESH 10000
3752 * Crude but fast random-number generator. Uses a linear congruential
3753 * generator, with occasional help from get_random_bytes().
3755 static unsigned long
3756 _drbd_fault_random(struct fault_random_state *rsp)
3760 if (!rsp->count--) {
3761 get_random_bytes(&refresh, sizeof(refresh));
3762 rsp->state += refresh;
3763 rsp->count = FAULT_RANDOM_REFRESH;
3765 rsp->state = rsp->state * FAULT_RANDOM_MULT + FAULT_RANDOM_ADD;
3766 return swahw32(rsp->state);
3770 _drbd_fault_str(unsigned int type) {
3771 static char *_faults[] = {
3772 [DRBD_FAULT_MD_WR] = "Meta-data write",
3773 [DRBD_FAULT_MD_RD] = "Meta-data read",
3774 [DRBD_FAULT_RS_WR] = "Resync write",
3775 [DRBD_FAULT_RS_RD] = "Resync read",
3776 [DRBD_FAULT_DT_WR] = "Data write",
3777 [DRBD_FAULT_DT_RD] = "Data read",
3778 [DRBD_FAULT_DT_RA] = "Data read ahead",
3779 [DRBD_FAULT_BM_ALLOC] = "BM allocation",
3780 [DRBD_FAULT_AL_EE] = "EE allocation",
3781 [DRBD_FAULT_RECEIVE] = "receive data corruption",
3784 return (type < DRBD_FAULT_MAX) ? _faults[type] : "**Unknown**";
3788 _drbd_insert_fault(struct drbd_conf *mdev, unsigned int type)
3790 static struct fault_random_state rrs = {0, 0};
3792 unsigned int ret = (
3794 ((1 << mdev_to_minor(mdev)) & fault_devs) != 0) &&
3795 (((_drbd_fault_random(&rrs) % 100) + 1) <= fault_rate));
3800 if (printk_ratelimit())
3801 dev_warn(DEV, "***Simulating %s failure\n",
3802 _drbd_fault_str(type));
3809 const char *drbd_buildtag(void)
3811 /* DRBD built from external sources has here a reference to the
3812 git hash of the source code. */
3814 static char buildtag[38] = "\0uilt-in";
3816 if (buildtag[0] == 0) {
3817 #ifdef CONFIG_MODULES
3818 if (THIS_MODULE != NULL)
3819 sprintf(buildtag, "srcversion: %-24s", THIS_MODULE->srcversion);
3828 module_init(drbd_init)
3829 module_exit(drbd_cleanup)
3831 EXPORT_SYMBOL(drbd_conn_str);
3832 EXPORT_SYMBOL(drbd_role_str);
3833 EXPORT_SYMBOL(drbd_disk_str);
3834 EXPORT_SYMBOL(drbd_set_st_err_str);