4 This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
6 Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
7 Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
8 Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
10 Thanks to Carter Burden, Bart Grantham and Gennadiy Nerubayev
11 from Logicworks, Inc. for making SDP replication support possible.
13 drbd is free software; you can redistribute it and/or modify
14 it under the terms of the GNU General Public License as published by
15 the Free Software Foundation; either version 2, or (at your option)
18 drbd is distributed in the hope that it will be useful,
19 but WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 GNU General Public License for more details.
23 You should have received a copy of the GNU General Public License
24 along with drbd; see the file COPYING. If not, write to
25 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
29 #include <linux/module.h>
30 #include <linux/drbd.h>
31 #include <asm/uaccess.h>
32 #include <asm/types.h>
34 #include <linux/ctype.h>
35 #include <linux/mutex.h>
37 #include <linux/file.h>
38 #include <linux/proc_fs.h>
39 #include <linux/init.h>
41 #include <linux/memcontrol.h>
42 #include <linux/mm_inline.h>
43 #include <linux/slab.h>
44 #include <linux/random.h>
45 #include <linux/reboot.h>
46 #include <linux/notifier.h>
47 #include <linux/kthread.h>
49 #define __KERNEL_SYSCALLS__
50 #include <linux/unistd.h>
51 #include <linux/vmalloc.h>
53 #include <linux/drbd_limits.h>
55 #include "drbd_req.h" /* only for _req_mod in tl_release and tl_clear */
59 static DEFINE_MUTEX(drbd_main_mutex
);
60 int drbdd_init(struct drbd_thread
*);
61 int drbd_worker(struct drbd_thread
*);
62 int drbd_asender(struct drbd_thread
*);
65 static int drbd_open(struct block_device
*bdev
, fmode_t mode
);
66 static int drbd_release(struct gendisk
*gd
, fmode_t mode
);
67 static int w_md_sync(struct drbd_work
*w
, int unused
);
68 static void md_sync_timer_fn(unsigned long data
);
69 static int w_bitmap_io(struct drbd_work
*w
, int unused
);
70 static int w_go_diskless(struct drbd_work
*w
, int unused
);
72 MODULE_AUTHOR("Philipp Reisner <phil@linbit.com>, "
73 "Lars Ellenberg <lars@linbit.com>");
74 MODULE_DESCRIPTION("drbd - Distributed Replicated Block Device v" REL_VERSION
);
75 MODULE_VERSION(REL_VERSION
);
76 MODULE_LICENSE("GPL");
77 MODULE_PARM_DESC(minor_count
, "Approximate number of drbd devices ("
78 __stringify(DRBD_MINOR_COUNT_MIN
) "-" __stringify(DRBD_MINOR_COUNT_MAX
) ")");
79 MODULE_ALIAS_BLOCKDEV_MAJOR(DRBD_MAJOR
);
81 #include <linux/moduleparam.h>
82 /* allow_open_on_secondary */
83 MODULE_PARM_DESC(allow_oos
, "DONT USE!");
84 /* thanks to these macros, if compiled into the kernel (not-module),
85 * this becomes the boot parameter drbd.minor_count */
86 module_param(minor_count
, uint
, 0444);
87 module_param(disable_sendpage
, bool, 0644);
88 module_param(allow_oos
, bool, 0);
89 module_param(proc_details
, int, 0644);
91 #ifdef CONFIG_DRBD_FAULT_INJECTION
94 static int fault_count
;
96 /* bitmap of enabled faults */
97 module_param(enable_faults
, int, 0664);
98 /* fault rate % value - applies to all enabled faults */
99 module_param(fault_rate
, int, 0664);
100 /* count of faults inserted */
101 module_param(fault_count
, int, 0664);
102 /* bitmap of devices to insert faults on */
103 module_param(fault_devs
, int, 0644);
106 /* module parameter, defined */
107 unsigned int minor_count
= DRBD_MINOR_COUNT_DEF
;
108 int disable_sendpage
;
110 int proc_details
; /* Detail level in proc drbd*/
112 /* Module parameter for setting the user mode helper program
113 * to run. Default is /sbin/drbdadm */
114 char usermode_helper
[80] = "/sbin/drbdadm";
116 module_param_string(usermode_helper
, usermode_helper
, sizeof(usermode_helper
), 0644);
118 /* in 2.6.x, our device mapping and config info contains our virtual gendisks
119 * as member "struct gendisk *vdisk;"
122 struct list_head drbd_tconns
; /* list of struct drbd_tconn */
123 DEFINE_MUTEX(drbd_cfg_mutex
);
125 struct kmem_cache
*drbd_request_cache
;
126 struct kmem_cache
*drbd_ee_cache
; /* peer requests */
127 struct kmem_cache
*drbd_bm_ext_cache
; /* bitmap extents */
128 struct kmem_cache
*drbd_al_ext_cache
; /* activity log extents */
129 mempool_t
*drbd_request_mempool
;
130 mempool_t
*drbd_ee_mempool
;
131 mempool_t
*drbd_md_io_page_pool
;
132 struct bio_set
*drbd_md_io_bio_set
;
134 /* I do not use a standard mempool, because:
135 1) I want to hand out the pre-allocated objects first.
136 2) I want to be able to interrupt sleeping allocation with a signal.
137 Note: This is a single linked list, the next pointer is the private
138 member of struct page.
140 struct page
*drbd_pp_pool
;
141 spinlock_t drbd_pp_lock
;
143 wait_queue_head_t drbd_pp_wait
;
145 DEFINE_RATELIMIT_STATE(drbd_ratelimit_state
, 5 * HZ
, 5);
147 static const struct block_device_operations drbd_ops
= {
148 .owner
= THIS_MODULE
,
150 .release
= drbd_release
,
153 static void bio_destructor_drbd(struct bio
*bio
)
155 bio_free(bio
, drbd_md_io_bio_set
);
158 struct bio
*bio_alloc_drbd(gfp_t gfp_mask
)
162 if (!drbd_md_io_bio_set
)
163 return bio_alloc(gfp_mask
, 1);
165 bio
= bio_alloc_bioset(gfp_mask
, 1, drbd_md_io_bio_set
);
168 bio
->bi_destructor
= bio_destructor_drbd
;
173 /* When checking with sparse, and this is an inline function, sparse will
174 give tons of false positives. When this is a real functions sparse works.
176 int _get_ldev_if_state(struct drbd_conf
*mdev
, enum drbd_disk_state mins
)
180 atomic_inc(&mdev
->local_cnt
);
181 io_allowed
= (mdev
->state
.disk
>= mins
);
183 if (atomic_dec_and_test(&mdev
->local_cnt
))
184 wake_up(&mdev
->misc_wait
);
192 * DOC: The transfer log
194 * The transfer log is a single linked list of &struct drbd_tl_epoch objects.
195 * mdev->tconn->newest_tle points to the head, mdev->tconn->oldest_tle points to the tail
196 * of the list. There is always at least one &struct drbd_tl_epoch object.
198 * Each &struct drbd_tl_epoch has a circular double linked list of requests
201 static int tl_init(struct drbd_tconn
*tconn
)
203 struct drbd_tl_epoch
*b
;
205 /* during device minor initialization, we may well use GFP_KERNEL */
206 b
= kmalloc(sizeof(struct drbd_tl_epoch
), GFP_KERNEL
);
209 INIT_LIST_HEAD(&b
->requests
);
210 INIT_LIST_HEAD(&b
->w
.list
);
214 b
->w
.cb
= NULL
; /* if this is != NULL, we need to dec_ap_pending in tl_clear */
216 tconn
->oldest_tle
= b
;
217 tconn
->newest_tle
= b
;
218 INIT_LIST_HEAD(&tconn
->out_of_sequence_requests
);
223 static void tl_cleanup(struct drbd_tconn
*tconn
)
225 if (tconn
->oldest_tle
!= tconn
->newest_tle
)
226 conn_err(tconn
, "ASSERT FAILED: oldest_tle == newest_tle\n");
227 if (!list_empty(&tconn
->out_of_sequence_requests
))
228 conn_err(tconn
, "ASSERT FAILED: list_empty(out_of_sequence_requests)\n");
229 kfree(tconn
->oldest_tle
);
230 tconn
->oldest_tle
= NULL
;
231 kfree(tconn
->unused_spare_tle
);
232 tconn
->unused_spare_tle
= NULL
;
236 * _tl_add_barrier() - Adds a barrier to the transfer log
237 * @mdev: DRBD device.
238 * @new: Barrier to be added before the current head of the TL.
240 * The caller must hold the req_lock.
242 void _tl_add_barrier(struct drbd_tconn
*tconn
, struct drbd_tl_epoch
*new)
244 struct drbd_tl_epoch
*newest_before
;
246 INIT_LIST_HEAD(&new->requests
);
247 INIT_LIST_HEAD(&new->w
.list
);
248 new->w
.cb
= NULL
; /* if this is != NULL, we need to dec_ap_pending in tl_clear */
252 newest_before
= tconn
->newest_tle
;
253 /* never send a barrier number == 0, because that is special-cased
254 * when using TCQ for our write ordering code */
255 new->br_number
= (newest_before
->br_number
+1) ?: 1;
256 if (tconn
->newest_tle
!= new) {
257 tconn
->newest_tle
->next
= new;
258 tconn
->newest_tle
= new;
263 * tl_release() - Free or recycle the oldest &struct drbd_tl_epoch object of the TL
264 * @mdev: DRBD device.
265 * @barrier_nr: Expected identifier of the DRBD write barrier packet.
266 * @set_size: Expected number of requests before that barrier.
268 * In case the passed barrier_nr or set_size does not match the oldest
269 * &struct drbd_tl_epoch objects this function will cause a termination
272 void tl_release(struct drbd_tconn
*tconn
, unsigned int barrier_nr
,
273 unsigned int set_size
)
275 struct drbd_conf
*mdev
;
276 struct drbd_tl_epoch
*b
, *nob
; /* next old barrier */
277 struct list_head
*le
, *tle
;
278 struct drbd_request
*r
;
280 spin_lock_irq(&tconn
->req_lock
);
282 b
= tconn
->oldest_tle
;
284 /* first some paranoia code */
286 conn_err(tconn
, "BAD! BarrierAck #%u received, but no epoch in tl!?\n",
290 if (b
->br_number
!= barrier_nr
) {
291 conn_err(tconn
, "BAD! BarrierAck #%u received, expected #%u!\n",
292 barrier_nr
, b
->br_number
);
295 if (b
->n_writes
!= set_size
) {
296 conn_err(tconn
, "BAD! BarrierAck #%u received with n_writes=%u, expected n_writes=%u!\n",
297 barrier_nr
, set_size
, b
->n_writes
);
301 /* Clean up list of requests processed during current epoch */
302 list_for_each_safe(le
, tle
, &b
->requests
) {
303 r
= list_entry(le
, struct drbd_request
, tl_requests
);
304 _req_mod(r
, BARRIER_ACKED
);
306 /* There could be requests on the list waiting for completion
307 of the write to the local disk. To avoid corruptions of
308 slab's data structures we have to remove the lists head.
310 Also there could have been a barrier ack out of sequence, overtaking
311 the write acks - which would be a bug and violating write ordering.
312 To not deadlock in case we lose connection while such requests are
313 still pending, we need some way to find them for the
314 _req_mode(CONNECTION_LOST_WHILE_PENDING).
316 These have been list_move'd to the out_of_sequence_requests list in
317 _req_mod(, BARRIER_ACKED) above.
319 list_del_init(&b
->requests
);
323 if (test_and_clear_bit(CREATE_BARRIER
, &mdev
->flags
)) {
324 _tl_add_barrier(tconn
, b
);
326 tconn
->oldest_tle
= nob
;
327 /* if nob == NULL b was the only barrier, and becomes the new
328 barrier. Therefore tconn->oldest_tle points already to b */
330 D_ASSERT(nob
!= NULL
);
331 tconn
->oldest_tle
= nob
;
335 spin_unlock_irq(&tconn
->req_lock
);
336 dec_ap_pending(mdev
);
341 spin_unlock_irq(&tconn
->req_lock
);
342 conn_request_state(tconn
, NS(conn
, C_PROTOCOL_ERROR
), CS_HARD
);
347 * _tl_restart() - Walks the transfer log, and applies an action to all requests
348 * @mdev: DRBD device.
349 * @what: The action/event to perform with all request objects
351 * @what might be one of CONNECTION_LOST_WHILE_PENDING, RESEND, FAIL_FROZEN_DISK_IO,
352 * RESTART_FROZEN_DISK_IO.
354 void _tl_restart(struct drbd_tconn
*tconn
, enum drbd_req_event what
)
356 struct drbd_tl_epoch
*b
, *tmp
, **pn
;
357 struct list_head
*le
, *tle
, carry_reads
;
358 struct drbd_request
*req
;
359 int rv
, n_writes
, n_reads
;
361 b
= tconn
->oldest_tle
;
362 pn
= &tconn
->oldest_tle
;
366 INIT_LIST_HEAD(&carry_reads
);
367 list_for_each_safe(le
, tle
, &b
->requests
) {
368 req
= list_entry(le
, struct drbd_request
, tl_requests
);
369 rv
= _req_mod(req
, what
);
371 n_writes
+= (rv
& MR_WRITE
) >> MR_WRITE_SHIFT
;
372 n_reads
+= (rv
& MR_READ
) >> MR_READ_SHIFT
;
377 if (what
== RESEND
) {
378 b
->n_writes
= n_writes
;
379 if (b
->w
.cb
== NULL
) {
380 b
->w
.cb
= w_send_barrier
;
381 inc_ap_pending(b
->w
.mdev
);
382 set_bit(CREATE_BARRIER
, &b
->w
.mdev
->flags
);
385 drbd_queue_work(&tconn
->data
.work
, &b
->w
);
390 list_add(&carry_reads
, &b
->requests
);
391 /* there could still be requests on that ring list,
392 * in case local io is still pending */
393 list_del(&b
->requests
);
395 /* dec_ap_pending corresponding to queue_barrier.
396 * the newest barrier may not have been queued yet,
397 * in which case w.cb is still NULL. */
399 dec_ap_pending(b
->w
.mdev
);
401 if (b
== tconn
->newest_tle
) {
402 /* recycle, but reinit! */
404 conn_err(tconn
, "ASSERT FAILED tmp == NULL");
405 INIT_LIST_HEAD(&b
->requests
);
406 list_splice(&carry_reads
, &b
->requests
);
407 INIT_LIST_HEAD(&b
->w
.list
);
409 b
->br_number
= net_random();
419 list_splice(&carry_reads
, &b
->requests
);
425 * tl_clear() - Clears all requests and &struct drbd_tl_epoch objects out of the TL
426 * @mdev: DRBD device.
428 * This is called after the connection to the peer was lost. The storage covered
429 * by the requests on the transfer gets marked as our of sync. Called from the
430 * receiver thread and the worker thread.
432 void tl_clear(struct drbd_tconn
*tconn
)
434 struct drbd_conf
*mdev
;
435 struct list_head
*le
, *tle
;
436 struct drbd_request
*r
;
439 spin_lock_irq(&tconn
->req_lock
);
441 _tl_restart(tconn
, CONNECTION_LOST_WHILE_PENDING
);
443 /* we expect this list to be empty. */
444 if (!list_empty(&tconn
->out_of_sequence_requests
))
445 conn_err(tconn
, "ASSERT FAILED list_empty(&out_of_sequence_requests)\n");
447 /* but just in case, clean it up anyways! */
448 list_for_each_safe(le
, tle
, &tconn
->out_of_sequence_requests
) {
449 r
= list_entry(le
, struct drbd_request
, tl_requests
);
450 /* It would be nice to complete outside of spinlock.
451 * But this is easier for now. */
452 _req_mod(r
, CONNECTION_LOST_WHILE_PENDING
);
455 /* ensure bit indicating barrier is required is clear */
456 idr_for_each_entry(&tconn
->volumes
, mdev
, vnr
)
457 clear_bit(CREATE_BARRIER
, &mdev
->flags
);
459 spin_unlock_irq(&tconn
->req_lock
);
462 void tl_restart(struct drbd_tconn
*tconn
, enum drbd_req_event what
)
464 spin_lock_irq(&tconn
->req_lock
);
465 _tl_restart(tconn
, what
);
466 spin_unlock_irq(&tconn
->req_lock
);
469 static int drbd_thread_setup(void *arg
)
471 struct drbd_thread
*thi
= (struct drbd_thread
*) arg
;
472 struct drbd_tconn
*tconn
= thi
->tconn
;
476 snprintf(current
->comm
, sizeof(current
->comm
), "drbd_%c_%s",
477 thi
->name
[0], thi
->tconn
->name
);
480 retval
= thi
->function(thi
);
482 spin_lock_irqsave(&thi
->t_lock
, flags
);
484 /* if the receiver has been "EXITING", the last thing it did
485 * was set the conn state to "StandAlone",
486 * if now a re-connect request comes in, conn state goes C_UNCONNECTED,
487 * and receiver thread will be "started".
488 * drbd_thread_start needs to set "RESTARTING" in that case.
489 * t_state check and assignment needs to be within the same spinlock,
490 * so either thread_start sees EXITING, and can remap to RESTARTING,
491 * or thread_start see NONE, and can proceed as normal.
494 if (thi
->t_state
== RESTARTING
) {
495 conn_info(tconn
, "Restarting %s thread\n", thi
->name
);
496 thi
->t_state
= RUNNING
;
497 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
504 complete(&thi
->stop
);
505 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
507 conn_info(tconn
, "Terminating %s\n", current
->comm
);
509 /* Release mod reference taken when thread was started */
510 module_put(THIS_MODULE
);
514 static void drbd_thread_init(struct drbd_tconn
*tconn
, struct drbd_thread
*thi
,
515 int (*func
) (struct drbd_thread
*), char *name
)
517 spin_lock_init(&thi
->t_lock
);
520 thi
->function
= func
;
522 strncpy(thi
->name
, name
, ARRAY_SIZE(thi
->name
));
525 int drbd_thread_start(struct drbd_thread
*thi
)
527 struct drbd_tconn
*tconn
= thi
->tconn
;
528 struct task_struct
*nt
;
531 /* is used from state engine doing drbd_thread_stop_nowait,
532 * while holding the req lock irqsave */
533 spin_lock_irqsave(&thi
->t_lock
, flags
);
535 switch (thi
->t_state
) {
537 conn_info(tconn
, "Starting %s thread (from %s [%d])\n",
538 thi
->name
, current
->comm
, current
->pid
);
540 /* Get ref on module for thread - this is released when thread exits */
541 if (!try_module_get(THIS_MODULE
)) {
542 conn_err(tconn
, "Failed to get module reference in drbd_thread_start\n");
543 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
547 init_completion(&thi
->stop
);
548 thi
->reset_cpu_mask
= 1;
549 thi
->t_state
= RUNNING
;
550 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
551 flush_signals(current
); /* otherw. may get -ERESTARTNOINTR */
553 nt
= kthread_create(drbd_thread_setup
, (void *) thi
,
554 "drbd_%c_%s", thi
->name
[0], thi
->tconn
->name
);
557 conn_err(tconn
, "Couldn't start thread\n");
559 module_put(THIS_MODULE
);
562 spin_lock_irqsave(&thi
->t_lock
, flags
);
564 thi
->t_state
= RUNNING
;
565 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
569 thi
->t_state
= RESTARTING
;
570 conn_info(tconn
, "Restarting %s thread (from %s [%d])\n",
571 thi
->name
, current
->comm
, current
->pid
);
576 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
584 void _drbd_thread_stop(struct drbd_thread
*thi
, int restart
, int wait
)
588 enum drbd_thread_state ns
= restart
? RESTARTING
: EXITING
;
590 /* may be called from state engine, holding the req lock irqsave */
591 spin_lock_irqsave(&thi
->t_lock
, flags
);
593 if (thi
->t_state
== NONE
) {
594 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
596 drbd_thread_start(thi
);
600 if (thi
->t_state
!= ns
) {
601 if (thi
->task
== NULL
) {
602 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
608 init_completion(&thi
->stop
);
609 if (thi
->task
!= current
)
610 force_sig(DRBD_SIGKILL
, thi
->task
);
613 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
616 wait_for_completion(&thi
->stop
);
619 static struct drbd_thread
*drbd_task_to_thread(struct drbd_tconn
*tconn
, struct task_struct
*task
)
621 struct drbd_thread
*thi
=
622 task
== tconn
->receiver
.task
? &tconn
->receiver
:
623 task
== tconn
->asender
.task
? &tconn
->asender
:
624 task
== tconn
->worker
.task
? &tconn
->worker
: NULL
;
629 char *drbd_task_to_thread_name(struct drbd_tconn
*tconn
, struct task_struct
*task
)
631 struct drbd_thread
*thi
= drbd_task_to_thread(tconn
, task
);
632 return thi
? thi
->name
: task
->comm
;
635 int conn_lowest_minor(struct drbd_tconn
*tconn
)
638 struct drbd_conf
*mdev
;
640 mdev
= idr_get_next(&tconn
->volumes
, &vnr
);
643 return mdev_to_minor(mdev
);
648 * drbd_calc_cpu_mask() - Generate CPU masks, spread over all CPUs
649 * @mdev: DRBD device.
651 * Forces all threads of a device onto the same CPU. This is beneficial for
652 * DRBD's performance. May be overwritten by user's configuration.
654 void drbd_calc_cpu_mask(struct drbd_tconn
*tconn
)
659 if (cpumask_weight(tconn
->cpu_mask
))
662 ord
= conn_lowest_minor(tconn
) % cpumask_weight(cpu_online_mask
);
663 for_each_online_cpu(cpu
) {
665 cpumask_set_cpu(cpu
, tconn
->cpu_mask
);
669 /* should not be reached */
670 cpumask_setall(tconn
->cpu_mask
);
674 * drbd_thread_current_set_cpu() - modifies the cpu mask of the _current_ thread
675 * @mdev: DRBD device.
676 * @thi: drbd_thread object
678 * call in the "main loop" of _all_ threads, no need for any mutex, current won't die
681 void drbd_thread_current_set_cpu(struct drbd_thread
*thi
)
683 struct task_struct
*p
= current
;
685 if (!thi
->reset_cpu_mask
)
687 thi
->reset_cpu_mask
= 0;
688 set_cpus_allowed_ptr(p
, thi
->tconn
->cpu_mask
);
693 * drbd_header_size - size of a packet header
695 * The header size is a multiple of 8, so any payload following the header is
696 * word aligned on 64-bit architectures. (The bitmap send and receive code
699 unsigned int drbd_header_size(struct drbd_tconn
*tconn
)
701 if (tconn
->agreed_pro_version
>= 100) {
702 BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header100
), 8));
703 return sizeof(struct p_header100
);
705 BUILD_BUG_ON(sizeof(struct p_header80
) !=
706 sizeof(struct p_header95
));
707 BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header80
), 8));
708 return sizeof(struct p_header80
);
712 static unsigned int prepare_header80(struct p_header80
*h
, enum drbd_packet cmd
, int size
)
714 h
->magic
= cpu_to_be32(DRBD_MAGIC
);
715 h
->command
= cpu_to_be16(cmd
);
716 h
->length
= cpu_to_be16(size
);
717 return sizeof(struct p_header80
);
720 static unsigned int prepare_header95(struct p_header95
*h
, enum drbd_packet cmd
, int size
)
722 h
->magic
= cpu_to_be16(DRBD_MAGIC_BIG
);
723 h
->command
= cpu_to_be16(cmd
);
724 h
->length
= cpu_to_be32(size
);
725 return sizeof(struct p_header95
);
728 static unsigned int prepare_header100(struct p_header100
*h
, enum drbd_packet cmd
,
731 h
->magic
= cpu_to_be32(DRBD_MAGIC_100
);
732 h
->volume
= cpu_to_be16(vnr
);
733 h
->command
= cpu_to_be16(cmd
);
734 h
->length
= cpu_to_be32(size
);
736 return sizeof(struct p_header100
);
739 static unsigned int prepare_header(struct drbd_tconn
*tconn
, int vnr
,
740 void *buffer
, enum drbd_packet cmd
, int size
)
742 if (tconn
->agreed_pro_version
>= 100)
743 return prepare_header100(buffer
, cmd
, size
, vnr
);
744 else if (tconn
->agreed_pro_version
>= 95 &&
745 size
> DRBD_MAX_SIZE_H80_PACKET
)
746 return prepare_header95(buffer
, cmd
, size
);
748 return prepare_header80(buffer
, cmd
, size
);
751 void *conn_prepare_command(struct drbd_tconn
*tconn
, struct drbd_socket
*sock
)
753 mutex_lock(&sock
->mutex
);
755 mutex_unlock(&sock
->mutex
);
758 return sock
->sbuf
+ drbd_header_size(tconn
);
761 void *drbd_prepare_command(struct drbd_conf
*mdev
, struct drbd_socket
*sock
)
763 return conn_prepare_command(mdev
->tconn
, sock
);
766 static int __send_command(struct drbd_tconn
*tconn
, int vnr
,
767 struct drbd_socket
*sock
, enum drbd_packet cmd
,
768 unsigned int header_size
, void *data
,
775 * Called with @data == NULL and the size of the data blocks in @size
776 * for commands that send data blocks. For those commands, omit the
777 * MSG_MORE flag: this will increase the likelihood that data blocks
778 * which are page aligned on the sender will end up page aligned on the
781 msg_flags
= data
? MSG_MORE
: 0;
783 header_size
+= prepare_header(tconn
, vnr
, sock
->sbuf
, cmd
,
785 err
= drbd_send_all(tconn
, sock
->socket
, sock
->sbuf
, header_size
,
788 err
= drbd_send_all(tconn
, sock
->socket
, data
, size
, 0);
792 int conn_send_command(struct drbd_tconn
*tconn
, struct drbd_socket
*sock
,
793 enum drbd_packet cmd
, unsigned int header_size
,
794 void *data
, unsigned int size
)
798 err
= __send_command(tconn
, 0, sock
, cmd
, header_size
, data
, size
);
799 mutex_unlock(&sock
->mutex
);
803 int drbd_send_command(struct drbd_conf
*mdev
, struct drbd_socket
*sock
,
804 enum drbd_packet cmd
, unsigned int header_size
,
805 void *data
, unsigned int size
)
809 err
= __send_command(mdev
->tconn
, mdev
->vnr
, sock
, cmd
, header_size
,
811 mutex_unlock(&sock
->mutex
);
815 int drbd_send_ping(struct drbd_tconn
*tconn
)
817 struct drbd_socket
*sock
;
820 if (!conn_prepare_command(tconn
, sock
))
822 return conn_send_command(tconn
, sock
, P_PING
, 0, NULL
, 0);
825 int drbd_send_ping_ack(struct drbd_tconn
*tconn
)
827 struct drbd_socket
*sock
;
830 if (!conn_prepare_command(tconn
, sock
))
832 return conn_send_command(tconn
, sock
, P_PING_ACK
, 0, NULL
, 0);
835 int drbd_send_sync_param(struct drbd_conf
*mdev
)
837 struct drbd_socket
*sock
;
838 struct p_rs_param_95
*p
;
840 const int apv
= mdev
->tconn
->agreed_pro_version
;
841 enum drbd_packet cmd
;
843 sock
= &mdev
->tconn
->data
;
844 p
= drbd_prepare_command(mdev
, sock
);
848 size
= apv
<= 87 ? sizeof(struct p_rs_param
)
849 : apv
== 88 ? sizeof(struct p_rs_param
)
850 + strlen(mdev
->tconn
->net_conf
->verify_alg
) + 1
851 : apv
<= 94 ? sizeof(struct p_rs_param_89
)
852 : /* apv >= 95 */ sizeof(struct p_rs_param_95
);
854 cmd
= apv
>= 89 ? P_SYNC_PARAM89
: P_SYNC_PARAM
;
856 /* initialize verify_alg and csums_alg */
857 memset(p
->verify_alg
, 0, 2 * SHARED_SECRET_MAX
);
859 if (get_ldev(mdev
)) {
860 p
->rate
= cpu_to_be32(mdev
->ldev
->dc
.resync_rate
);
861 p
->c_plan_ahead
= cpu_to_be32(mdev
->ldev
->dc
.c_plan_ahead
);
862 p
->c_delay_target
= cpu_to_be32(mdev
->ldev
->dc
.c_delay_target
);
863 p
->c_fill_target
= cpu_to_be32(mdev
->ldev
->dc
.c_fill_target
);
864 p
->c_max_rate
= cpu_to_be32(mdev
->ldev
->dc
.c_max_rate
);
867 p
->rate
= cpu_to_be32(DRBD_RATE_DEF
);
868 p
->c_plan_ahead
= cpu_to_be32(DRBD_C_PLAN_AHEAD_DEF
);
869 p
->c_delay_target
= cpu_to_be32(DRBD_C_DELAY_TARGET_DEF
);
870 p
->c_fill_target
= cpu_to_be32(DRBD_C_FILL_TARGET_DEF
);
871 p
->c_max_rate
= cpu_to_be32(DRBD_C_MAX_RATE_DEF
);
875 strcpy(p
->verify_alg
, mdev
->tconn
->net_conf
->verify_alg
);
877 strcpy(p
->csums_alg
, mdev
->tconn
->net_conf
->csums_alg
);
879 return drbd_send_command(mdev
, sock
, cmd
, size
, NULL
, 0);
882 int drbd_send_protocol(struct drbd_tconn
*tconn
)
884 struct drbd_socket
*sock
;
885 struct p_protocol
*p
;
888 if (tconn
->net_conf
->dry_run
&& tconn
->agreed_pro_version
< 92) {
889 conn_err(tconn
, "--dry-run is not supported by peer");
894 p
= conn_prepare_command(tconn
, sock
);
899 if (tconn
->agreed_pro_version
>= 87)
900 size
+= strlen(tconn
->net_conf
->integrity_alg
) + 1;
902 p
->protocol
= cpu_to_be32(tconn
->net_conf
->wire_protocol
);
903 p
->after_sb_0p
= cpu_to_be32(tconn
->net_conf
->after_sb_0p
);
904 p
->after_sb_1p
= cpu_to_be32(tconn
->net_conf
->after_sb_1p
);
905 p
->after_sb_2p
= cpu_to_be32(tconn
->net_conf
->after_sb_2p
);
906 p
->two_primaries
= cpu_to_be32(tconn
->net_conf
->two_primaries
);
908 if (tconn
->net_conf
->want_lose
)
910 if (tconn
->net_conf
->dry_run
)
912 p
->conn_flags
= cpu_to_be32(cf
);
914 if (tconn
->agreed_pro_version
>= 87)
915 strcpy(p
->integrity_alg
, tconn
->net_conf
->integrity_alg
);
916 return conn_send_command(tconn
, sock
, P_PROTOCOL
, size
, NULL
, 0);
919 int _drbd_send_uuids(struct drbd_conf
*mdev
, u64 uuid_flags
)
921 struct drbd_socket
*sock
;
925 if (!get_ldev_if_state(mdev
, D_NEGOTIATING
))
928 sock
= &mdev
->tconn
->data
;
929 p
= drbd_prepare_command(mdev
, sock
);
934 for (i
= UI_CURRENT
; i
< UI_SIZE
; i
++)
935 p
->uuid
[i
] = mdev
->ldev
? cpu_to_be64(mdev
->ldev
->md
.uuid
[i
]) : 0;
937 mdev
->comm_bm_set
= drbd_bm_total_weight(mdev
);
938 p
->uuid
[UI_SIZE
] = cpu_to_be64(mdev
->comm_bm_set
);
939 uuid_flags
|= mdev
->tconn
->net_conf
->want_lose
? 1 : 0;
940 uuid_flags
|= test_bit(CRASHED_PRIMARY
, &mdev
->flags
) ? 2 : 0;
941 uuid_flags
|= mdev
->new_state_tmp
.disk
== D_INCONSISTENT
? 4 : 0;
942 p
->uuid
[UI_FLAGS
] = cpu_to_be64(uuid_flags
);
945 return drbd_send_command(mdev
, sock
, P_UUIDS
, sizeof(*p
), NULL
, 0);
948 int drbd_send_uuids(struct drbd_conf
*mdev
)
950 return _drbd_send_uuids(mdev
, 0);
953 int drbd_send_uuids_skip_initial_sync(struct drbd_conf
*mdev
)
955 return _drbd_send_uuids(mdev
, 8);
958 void drbd_print_uuids(struct drbd_conf
*mdev
, const char *text
)
960 if (get_ldev_if_state(mdev
, D_NEGOTIATING
)) {
961 u64
*uuid
= mdev
->ldev
->md
.uuid
;
962 dev_info(DEV
, "%s %016llX:%016llX:%016llX:%016llX\n",
964 (unsigned long long)uuid
[UI_CURRENT
],
965 (unsigned long long)uuid
[UI_BITMAP
],
966 (unsigned long long)uuid
[UI_HISTORY_START
],
967 (unsigned long long)uuid
[UI_HISTORY_END
]);
970 dev_info(DEV
, "%s effective data uuid: %016llX\n",
972 (unsigned long long)mdev
->ed_uuid
);
976 void drbd_gen_and_send_sync_uuid(struct drbd_conf
*mdev
)
978 struct drbd_socket
*sock
;
982 D_ASSERT(mdev
->state
.disk
== D_UP_TO_DATE
);
984 uuid
= mdev
->ldev
->md
.uuid
[UI_BITMAP
] + UUID_NEW_BM_OFFSET
;
985 drbd_uuid_set(mdev
, UI_BITMAP
, uuid
);
986 drbd_print_uuids(mdev
, "updated sync UUID");
989 sock
= &mdev
->tconn
->data
;
990 p
= drbd_prepare_command(mdev
, sock
);
992 p
->uuid
= cpu_to_be64(uuid
);
993 drbd_send_command(mdev
, sock
, P_SYNC_UUID
, sizeof(*p
), NULL
, 0);
997 int drbd_send_sizes(struct drbd_conf
*mdev
, int trigger_reply
, enum dds_flags flags
)
999 struct drbd_socket
*sock
;
1001 sector_t d_size
, u_size
;
1002 int q_order_type
, max_bio_size
;
1004 if (get_ldev_if_state(mdev
, D_NEGOTIATING
)) {
1005 D_ASSERT(mdev
->ldev
->backing_bdev
);
1006 d_size
= drbd_get_max_capacity(mdev
->ldev
);
1007 u_size
= mdev
->ldev
->dc
.disk_size
;
1008 q_order_type
= drbd_queue_order_type(mdev
);
1009 max_bio_size
= queue_max_hw_sectors(mdev
->ldev
->backing_bdev
->bd_disk
->queue
) << 9;
1010 max_bio_size
= min_t(int, max_bio_size
, DRBD_MAX_BIO_SIZE
);
1015 q_order_type
= QUEUE_ORDERED_NONE
;
1016 max_bio_size
= DRBD_MAX_BIO_SIZE
; /* ... multiple BIOs per peer_request */
1019 sock
= &mdev
->tconn
->data
;
1020 p
= drbd_prepare_command(mdev
, sock
);
1023 p
->d_size
= cpu_to_be64(d_size
);
1024 p
->u_size
= cpu_to_be64(u_size
);
1025 p
->c_size
= cpu_to_be64(trigger_reply
? 0 : drbd_get_capacity(mdev
->this_bdev
));
1026 p
->max_bio_size
= cpu_to_be32(max_bio_size
);
1027 p
->queue_order_type
= cpu_to_be16(q_order_type
);
1028 p
->dds_flags
= cpu_to_be16(flags
);
1029 return drbd_send_command(mdev
, sock
, P_SIZES
, sizeof(*p
), NULL
, 0);
1033 * drbd_send_state() - Sends the drbd state to the peer
1034 * @mdev: DRBD device.
1036 int drbd_send_state(struct drbd_conf
*mdev
)
1038 struct drbd_socket
*sock
;
1041 sock
= &mdev
->tconn
->data
;
1042 p
= drbd_prepare_command(mdev
, sock
);
1045 p
->state
= cpu_to_be32(mdev
->state
.i
); /* Within the send mutex */
1046 return drbd_send_command(mdev
, sock
, P_STATE
, sizeof(*p
), NULL
, 0);
1049 int drbd_send_state_req(struct drbd_conf
*mdev
, union drbd_state mask
, union drbd_state val
)
1051 struct drbd_socket
*sock
;
1052 struct p_req_state
*p
;
1054 sock
= &mdev
->tconn
->data
;
1055 p
= drbd_prepare_command(mdev
, sock
);
1058 p
->mask
= cpu_to_be32(mask
.i
);
1059 p
->val
= cpu_to_be32(val
.i
);
1060 return drbd_send_command(mdev
, sock
, P_STATE_CHG_REQ
, sizeof(*p
), NULL
, 0);
1064 int conn_send_state_req(struct drbd_tconn
*tconn
, union drbd_state mask
, union drbd_state val
)
1066 enum drbd_packet cmd
;
1067 struct drbd_socket
*sock
;
1068 struct p_req_state
*p
;
1070 cmd
= tconn
->agreed_pro_version
< 100 ? P_STATE_CHG_REQ
: P_CONN_ST_CHG_REQ
;
1071 sock
= &tconn
->data
;
1072 p
= conn_prepare_command(tconn
, sock
);
1075 p
->mask
= cpu_to_be32(mask
.i
);
1076 p
->val
= cpu_to_be32(val
.i
);
1077 return conn_send_command(tconn
, sock
, cmd
, sizeof(*p
), NULL
, 0);
1080 void drbd_send_sr_reply(struct drbd_conf
*mdev
, enum drbd_state_rv retcode
)
1082 struct drbd_socket
*sock
;
1083 struct p_req_state_reply
*p
;
1085 sock
= &mdev
->tconn
->meta
;
1086 p
= drbd_prepare_command(mdev
, sock
);
1088 p
->retcode
= cpu_to_be32(retcode
);
1089 drbd_send_command(mdev
, sock
, P_STATE_CHG_REPLY
, sizeof(*p
), NULL
, 0);
1093 void conn_send_sr_reply(struct drbd_tconn
*tconn
, enum drbd_state_rv retcode
)
1095 struct drbd_socket
*sock
;
1096 struct p_req_state_reply
*p
;
1097 enum drbd_packet cmd
= tconn
->agreed_pro_version
< 100 ? P_STATE_CHG_REPLY
: P_CONN_ST_CHG_REPLY
;
1099 sock
= &tconn
->meta
;
1100 p
= conn_prepare_command(tconn
, sock
);
1102 p
->retcode
= cpu_to_be32(retcode
);
1103 conn_send_command(tconn
, sock
, cmd
, sizeof(*p
), NULL
, 0);
1107 static void dcbp_set_code(struct p_compressed_bm
*p
, enum drbd_bitmap_code code
)
1109 BUG_ON(code
& ~0xf);
1110 p
->encoding
= (p
->encoding
& ~0xf) | code
;
1113 static void dcbp_set_start(struct p_compressed_bm
*p
, int set
)
1115 p
->encoding
= (p
->encoding
& ~0x80) | (set
? 0x80 : 0);
1118 static void dcbp_set_pad_bits(struct p_compressed_bm
*p
, int n
)
1121 p
->encoding
= (p
->encoding
& (~0x7 << 4)) | (n
<< 4);
1124 int fill_bitmap_rle_bits(struct drbd_conf
*mdev
,
1125 struct p_compressed_bm
*p
,
1127 struct bm_xfer_ctx
*c
)
1129 struct bitstream bs
;
1130 unsigned long plain_bits
;
1137 /* may we use this feature? */
1138 if ((mdev
->tconn
->net_conf
->use_rle
== 0) ||
1139 (mdev
->tconn
->agreed_pro_version
< 90))
1142 if (c
->bit_offset
>= c
->bm_bits
)
1143 return 0; /* nothing to do. */
1145 /* use at most thus many bytes */
1146 bitstream_init(&bs
, p
->code
, size
, 0);
1147 memset(p
->code
, 0, size
);
1148 /* plain bits covered in this code string */
1151 /* p->encoding & 0x80 stores whether the first run length is set.
1152 * bit offset is implicit.
1153 * start with toggle == 2 to be able to tell the first iteration */
1156 /* see how much plain bits we can stuff into one packet
1157 * using RLE and VLI. */
1159 tmp
= (toggle
== 0) ? _drbd_bm_find_next_zero(mdev
, c
->bit_offset
)
1160 : _drbd_bm_find_next(mdev
, c
->bit_offset
);
1163 rl
= tmp
- c
->bit_offset
;
1165 if (toggle
== 2) { /* first iteration */
1167 /* the first checked bit was set,
1168 * store start value, */
1169 dcbp_set_start(p
, 1);
1170 /* but skip encoding of zero run length */
1174 dcbp_set_start(p
, 0);
1177 /* paranoia: catch zero runlength.
1178 * can only happen if bitmap is modified while we scan it. */
1180 dev_err(DEV
, "unexpected zero runlength while encoding bitmap "
1181 "t:%u bo:%lu\n", toggle
, c
->bit_offset
);
1185 bits
= vli_encode_bits(&bs
, rl
);
1186 if (bits
== -ENOBUFS
) /* buffer full */
1189 dev_err(DEV
, "error while encoding bitmap: %d\n", bits
);
1195 c
->bit_offset
= tmp
;
1196 } while (c
->bit_offset
< c
->bm_bits
);
1198 len
= bs
.cur
.b
- p
->code
+ !!bs
.cur
.bit
;
1200 if (plain_bits
< (len
<< 3)) {
1201 /* incompressible with this method.
1202 * we need to rewind both word and bit position. */
1203 c
->bit_offset
-= plain_bits
;
1204 bm_xfer_ctx_bit_to_word_offset(c
);
1205 c
->bit_offset
= c
->word_offset
* BITS_PER_LONG
;
1209 /* RLE + VLI was able to compress it just fine.
1210 * update c->word_offset. */
1211 bm_xfer_ctx_bit_to_word_offset(c
);
1213 /* store pad_bits */
1214 dcbp_set_pad_bits(p
, (8 - bs
.cur
.bit
) & 0x7);
1220 * send_bitmap_rle_or_plain
1222 * Return 0 when done, 1 when another iteration is needed, and a negative error
1223 * code upon failure.
1226 send_bitmap_rle_or_plain(struct drbd_conf
*mdev
, struct bm_xfer_ctx
*c
)
1228 struct drbd_socket
*sock
= &mdev
->tconn
->data
;
1229 unsigned int header_size
= drbd_header_size(mdev
->tconn
);
1230 struct p_compressed_bm
*p
= sock
->sbuf
+ header_size
;
1233 len
= fill_bitmap_rle_bits(mdev
, p
,
1234 DRBD_SOCKET_BUFFER_SIZE
- header_size
- sizeof(*p
), c
);
1239 dcbp_set_code(p
, RLE_VLI_Bits
);
1240 err
= __send_command(mdev
->tconn
, mdev
->vnr
, sock
,
1241 P_COMPRESSED_BITMAP
, sizeof(*p
) + len
,
1244 c
->bytes
[0] += header_size
+ sizeof(*p
) + len
;
1246 if (c
->bit_offset
>= c
->bm_bits
)
1249 /* was not compressible.
1250 * send a buffer full of plain text bits instead. */
1251 unsigned int data_size
;
1252 unsigned long num_words
;
1253 unsigned long *p
= sock
->sbuf
+ header_size
;
1255 data_size
= DRBD_SOCKET_BUFFER_SIZE
- header_size
;
1256 num_words
= min_t(size_t, data_size
/ sizeof(*p
),
1257 c
->bm_words
- c
->word_offset
);
1258 len
= num_words
* sizeof(*p
);
1260 drbd_bm_get_lel(mdev
, c
->word_offset
, num_words
, p
);
1261 err
= __send_command(mdev
->tconn
, mdev
->vnr
, sock
, P_BITMAP
, len
, NULL
, 0);
1262 c
->word_offset
+= num_words
;
1263 c
->bit_offset
= c
->word_offset
* BITS_PER_LONG
;
1266 c
->bytes
[1] += header_size
+ len
;
1268 if (c
->bit_offset
> c
->bm_bits
)
1269 c
->bit_offset
= c
->bm_bits
;
1273 INFO_bm_xfer_stats(mdev
, "send", c
);
1281 /* See the comment at receive_bitmap() */
1282 static int _drbd_send_bitmap(struct drbd_conf
*mdev
)
1284 struct bm_xfer_ctx c
;
1287 if (!expect(mdev
->bitmap
))
1290 if (get_ldev(mdev
)) {
1291 if (drbd_md_test_flag(mdev
->ldev
, MDF_FULL_SYNC
)) {
1292 dev_info(DEV
, "Writing the whole bitmap, MDF_FullSync was set.\n");
1293 drbd_bm_set_all(mdev
);
1294 if (drbd_bm_write(mdev
)) {
1295 /* write_bm did fail! Leave full sync flag set in Meta P_DATA
1296 * but otherwise process as per normal - need to tell other
1297 * side that a full resync is required! */
1298 dev_err(DEV
, "Failed to write bitmap to disk!\n");
1300 drbd_md_clear_flag(mdev
, MDF_FULL_SYNC
);
1307 c
= (struct bm_xfer_ctx
) {
1308 .bm_bits
= drbd_bm_bits(mdev
),
1309 .bm_words
= drbd_bm_words(mdev
),
1313 err
= send_bitmap_rle_or_plain(mdev
, &c
);
1319 int drbd_send_bitmap(struct drbd_conf
*mdev
)
1321 struct drbd_socket
*sock
= &mdev
->tconn
->data
;
1324 mutex_lock(&sock
->mutex
);
1326 err
= !_drbd_send_bitmap(mdev
);
1327 mutex_unlock(&sock
->mutex
);
1331 void drbd_send_b_ack(struct drbd_conf
*mdev
, u32 barrier_nr
, u32 set_size
)
1333 struct drbd_socket
*sock
;
1334 struct p_barrier_ack
*p
;
1336 if (mdev
->state
.conn
< C_CONNECTED
)
1339 sock
= &mdev
->tconn
->meta
;
1340 p
= drbd_prepare_command(mdev
, sock
);
1343 p
->barrier
= barrier_nr
;
1344 p
->set_size
= cpu_to_be32(set_size
);
1345 drbd_send_command(mdev
, sock
, P_BARRIER_ACK
, sizeof(*p
), NULL
, 0);
1349 * _drbd_send_ack() - Sends an ack packet
1350 * @mdev: DRBD device.
1351 * @cmd: Packet command code.
1352 * @sector: sector, needs to be in big endian byte order
1353 * @blksize: size in byte, needs to be in big endian byte order
1354 * @block_id: Id, big endian byte order
1356 static int _drbd_send_ack(struct drbd_conf
*mdev
, enum drbd_packet cmd
,
1357 u64 sector
, u32 blksize
, u64 block_id
)
1359 struct drbd_socket
*sock
;
1360 struct p_block_ack
*p
;
1362 if (mdev
->state
.conn
< C_CONNECTED
)
1365 sock
= &mdev
->tconn
->meta
;
1366 p
= drbd_prepare_command(mdev
, sock
);
1370 p
->block_id
= block_id
;
1371 p
->blksize
= blksize
;
1372 p
->seq_num
= cpu_to_be32(atomic_inc_return(&mdev
->packet_seq
));
1373 return drbd_send_command(mdev
, sock
, cmd
, sizeof(*p
), NULL
, 0);
1376 /* dp->sector and dp->block_id already/still in network byte order,
1377 * data_size is payload size according to dp->head,
1378 * and may need to be corrected for digest size. */
1379 void drbd_send_ack_dp(struct drbd_conf
*mdev
, enum drbd_packet cmd
,
1380 struct p_data
*dp
, int data_size
)
1382 data_size
-= (mdev
->tconn
->agreed_pro_version
>= 87 && mdev
->tconn
->integrity_r_tfm
) ?
1383 crypto_hash_digestsize(mdev
->tconn
->integrity_r_tfm
) : 0;
1384 _drbd_send_ack(mdev
, cmd
, dp
->sector
, cpu_to_be32(data_size
),
1388 void drbd_send_ack_rp(struct drbd_conf
*mdev
, enum drbd_packet cmd
,
1389 struct p_block_req
*rp
)
1391 _drbd_send_ack(mdev
, cmd
, rp
->sector
, rp
->blksize
, rp
->block_id
);
1395 * drbd_send_ack() - Sends an ack packet
1396 * @mdev: DRBD device
1397 * @cmd: packet command code
1398 * @peer_req: peer request
1400 int drbd_send_ack(struct drbd_conf
*mdev
, enum drbd_packet cmd
,
1401 struct drbd_peer_request
*peer_req
)
1403 return _drbd_send_ack(mdev
, cmd
,
1404 cpu_to_be64(peer_req
->i
.sector
),
1405 cpu_to_be32(peer_req
->i
.size
),
1406 peer_req
->block_id
);
1409 /* This function misuses the block_id field to signal if the blocks
1410 * are is sync or not. */
1411 int drbd_send_ack_ex(struct drbd_conf
*mdev
, enum drbd_packet cmd
,
1412 sector_t sector
, int blksize
, u64 block_id
)
1414 return _drbd_send_ack(mdev
, cmd
,
1415 cpu_to_be64(sector
),
1416 cpu_to_be32(blksize
),
1417 cpu_to_be64(block_id
));
1420 int drbd_send_drequest(struct drbd_conf
*mdev
, int cmd
,
1421 sector_t sector
, int size
, u64 block_id
)
1423 struct drbd_socket
*sock
;
1424 struct p_block_req
*p
;
1426 sock
= &mdev
->tconn
->data
;
1427 p
= drbd_prepare_command(mdev
, sock
);
1430 p
->sector
= cpu_to_be64(sector
);
1431 p
->block_id
= block_id
;
1432 p
->blksize
= cpu_to_be32(size
);
1433 return drbd_send_command(mdev
, sock
, cmd
, sizeof(*p
), NULL
, 0);
1436 int drbd_send_drequest_csum(struct drbd_conf
*mdev
, sector_t sector
, int size
,
1437 void *digest
, int digest_size
, enum drbd_packet cmd
)
1439 struct drbd_socket
*sock
;
1440 struct p_block_req
*p
;
1442 /* FIXME: Put the digest into the preallocated socket buffer. */
1444 sock
= &mdev
->tconn
->data
;
1445 p
= drbd_prepare_command(mdev
, sock
);
1448 p
->sector
= cpu_to_be64(sector
);
1449 p
->block_id
= ID_SYNCER
/* unused */;
1450 p
->blksize
= cpu_to_be32(size
);
1451 return drbd_send_command(mdev
, sock
, cmd
, sizeof(*p
),
1452 digest
, digest_size
);
1455 int drbd_send_ov_request(struct drbd_conf
*mdev
, sector_t sector
, int size
)
1457 struct drbd_socket
*sock
;
1458 struct p_block_req
*p
;
1460 sock
= &mdev
->tconn
->data
;
1461 p
= drbd_prepare_command(mdev
, sock
);
1464 p
->sector
= cpu_to_be64(sector
);
1465 p
->block_id
= ID_SYNCER
/* unused */;
1466 p
->blksize
= cpu_to_be32(size
);
1467 return drbd_send_command(mdev
, sock
, P_OV_REQUEST
, sizeof(*p
), NULL
, 0);
1470 /* called on sndtimeo
1471 * returns false if we should retry,
1472 * true if we think connection is dead
1474 static int we_should_drop_the_connection(struct drbd_tconn
*tconn
, struct socket
*sock
)
1477 /* long elapsed = (long)(jiffies - mdev->last_received); */
1479 drop_it
= tconn
->meta
.socket
== sock
1480 || !tconn
->asender
.task
1481 || get_t_state(&tconn
->asender
) != RUNNING
1482 || tconn
->cstate
< C_WF_REPORT_PARAMS
;
1487 drop_it
= !--tconn
->ko_count
;
1489 conn_err(tconn
, "[%s/%d] sock_sendmsg time expired, ko = %u\n",
1490 current
->comm
, current
->pid
, tconn
->ko_count
);
1491 request_ping(tconn
);
1494 return drop_it
; /* && (mdev->state == R_PRIMARY) */;
1497 static void drbd_update_congested(struct drbd_tconn
*tconn
)
1499 struct sock
*sk
= tconn
->data
.socket
->sk
;
1500 if (sk
->sk_wmem_queued
> sk
->sk_sndbuf
* 4 / 5)
1501 set_bit(NET_CONGESTED
, &tconn
->flags
);
1504 /* The idea of sendpage seems to be to put some kind of reference
1505 * to the page into the skb, and to hand it over to the NIC. In
1506 * this process get_page() gets called.
1508 * As soon as the page was really sent over the network put_page()
1509 * gets called by some part of the network layer. [ NIC driver? ]
1511 * [ get_page() / put_page() increment/decrement the count. If count
1512 * reaches 0 the page will be freed. ]
1514 * This works nicely with pages from FSs.
1515 * But this means that in protocol A we might signal IO completion too early!
1517 * In order not to corrupt data during a resync we must make sure
1518 * that we do not reuse our own buffer pages (EEs) to early, therefore
1519 * we have the net_ee list.
1521 * XFS seems to have problems, still, it submits pages with page_count == 0!
1522 * As a workaround, we disable sendpage on pages
1523 * with page_count == 0 or PageSlab.
1525 static int _drbd_no_send_page(struct drbd_conf
*mdev
, struct page
*page
,
1526 int offset
, size_t size
, unsigned msg_flags
)
1528 struct socket
*socket
;
1532 socket
= mdev
->tconn
->data
.socket
;
1533 addr
= kmap(page
) + offset
;
1534 err
= drbd_send_all(mdev
->tconn
, socket
, addr
, size
, msg_flags
);
1537 mdev
->send_cnt
+= size
>> 9;
1541 static int _drbd_send_page(struct drbd_conf
*mdev
, struct page
*page
,
1542 int offset
, size_t size
, unsigned msg_flags
)
1544 struct socket
*socket
= mdev
->tconn
->data
.socket
;
1545 mm_segment_t oldfs
= get_fs();
1549 /* e.g. XFS meta- & log-data is in slab pages, which have a
1550 * page_count of 0 and/or have PageSlab() set.
1551 * we cannot use send_page for those, as that does get_page();
1552 * put_page(); and would cause either a VM_BUG directly, or
1553 * __page_cache_release a page that would actually still be referenced
1554 * by someone, leading to some obscure delayed Oops somewhere else. */
1555 if (disable_sendpage
|| (page_count(page
) < 1) || PageSlab(page
))
1556 return _drbd_no_send_page(mdev
, page
, offset
, size
, msg_flags
);
1558 msg_flags
|= MSG_NOSIGNAL
;
1559 drbd_update_congested(mdev
->tconn
);
1564 sent
= socket
->ops
->sendpage(socket
, page
, offset
, len
, msg_flags
);
1566 if (sent
== -EAGAIN
) {
1567 if (we_should_drop_the_connection(mdev
->tconn
, socket
))
1571 dev_warn(DEV
, "%s: size=%d len=%d sent=%d\n",
1572 __func__
, (int)size
, len
, sent
);
1579 } while (len
> 0 /* THINK && mdev->cstate >= C_CONNECTED*/);
1581 clear_bit(NET_CONGESTED
, &mdev
->tconn
->flags
);
1585 mdev
->send_cnt
+= size
>> 9;
1590 static int _drbd_send_bio(struct drbd_conf
*mdev
, struct bio
*bio
)
1592 struct bio_vec
*bvec
;
1594 /* hint all but last page with MSG_MORE */
1595 __bio_for_each_segment(bvec
, bio
, i
, 0) {
1598 err
= _drbd_no_send_page(mdev
, bvec
->bv_page
,
1599 bvec
->bv_offset
, bvec
->bv_len
,
1600 i
== bio
->bi_vcnt
- 1 ? 0 : MSG_MORE
);
1607 static int _drbd_send_zc_bio(struct drbd_conf
*mdev
, struct bio
*bio
)
1609 struct bio_vec
*bvec
;
1611 /* hint all but last page with MSG_MORE */
1612 __bio_for_each_segment(bvec
, bio
, i
, 0) {
1615 err
= _drbd_send_page(mdev
, bvec
->bv_page
,
1616 bvec
->bv_offset
, bvec
->bv_len
,
1617 i
== bio
->bi_vcnt
- 1 ? 0 : MSG_MORE
);
1624 static int _drbd_send_zc_ee(struct drbd_conf
*mdev
,
1625 struct drbd_peer_request
*peer_req
)
1627 struct page
*page
= peer_req
->pages
;
1628 unsigned len
= peer_req
->i
.size
;
1631 /* hint all but last page with MSG_MORE */
1632 page_chain_for_each(page
) {
1633 unsigned l
= min_t(unsigned, len
, PAGE_SIZE
);
1635 err
= _drbd_send_page(mdev
, page
, 0, l
,
1636 page_chain_next(page
) ? MSG_MORE
: 0);
1644 static u32
bio_flags_to_wire(struct drbd_conf
*mdev
, unsigned long bi_rw
)
1646 if (mdev
->tconn
->agreed_pro_version
>= 95)
1647 return (bi_rw
& REQ_SYNC
? DP_RW_SYNC
: 0) |
1648 (bi_rw
& REQ_FUA
? DP_FUA
: 0) |
1649 (bi_rw
& REQ_FLUSH
? DP_FLUSH
: 0) |
1650 (bi_rw
& REQ_DISCARD
? DP_DISCARD
: 0);
1652 return bi_rw
& REQ_SYNC
? DP_RW_SYNC
: 0;
1655 /* Used to send write requests
1656 * R_PRIMARY -> Peer (P_DATA)
1658 int drbd_send_dblock(struct drbd_conf
*mdev
, struct drbd_request
*req
)
1660 struct drbd_socket
*sock
;
1662 unsigned int dp_flags
= 0;
1666 dgs
= (mdev
->tconn
->agreed_pro_version
>= 87 && mdev
->tconn
->integrity_w_tfm
) ?
1667 crypto_hash_digestsize(mdev
->tconn
->integrity_w_tfm
) : 0;
1669 sock
= &mdev
->tconn
->data
;
1670 p
= drbd_prepare_command(mdev
, sock
);
1673 p
->sector
= cpu_to_be64(req
->i
.sector
);
1674 p
->block_id
= (unsigned long)req
;
1675 p
->seq_num
= cpu_to_be32(req
->seq_num
= atomic_inc_return(&mdev
->packet_seq
));
1676 dp_flags
= bio_flags_to_wire(mdev
, req
->master_bio
->bi_rw
);
1677 if (mdev
->state
.conn
>= C_SYNC_SOURCE
&&
1678 mdev
->state
.conn
<= C_PAUSED_SYNC_T
)
1679 dp_flags
|= DP_MAY_SET_IN_SYNC
;
1680 p
->dp_flags
= cpu_to_be32(dp_flags
);
1682 drbd_csum_bio(mdev
, mdev
->tconn
->integrity_w_tfm
, req
->master_bio
, p
+ 1);
1683 err
= __send_command(mdev
->tconn
, mdev
->vnr
, sock
, P_DATA
, sizeof(*p
) + dgs
, NULL
, req
->i
.size
);
1685 /* For protocol A, we have to memcpy the payload into
1686 * socket buffers, as we may complete right away
1687 * as soon as we handed it over to tcp, at which point the data
1688 * pages may become invalid.
1690 * For data-integrity enabled, we copy it as well, so we can be
1691 * sure that even if the bio pages may still be modified, it
1692 * won't change the data on the wire, thus if the digest checks
1693 * out ok after sending on this side, but does not fit on the
1694 * receiving side, we sure have detected corruption elsewhere.
1696 if (mdev
->tconn
->net_conf
->wire_protocol
== DRBD_PROT_A
|| dgs
)
1697 err
= _drbd_send_bio(mdev
, req
->master_bio
);
1699 err
= _drbd_send_zc_bio(mdev
, req
->master_bio
);
1701 /* double check digest, sometimes buffers have been modified in flight. */
1702 if (dgs
> 0 && dgs
<= 64) {
1703 /* 64 byte, 512 bit, is the largest digest size
1704 * currently supported in kernel crypto. */
1705 unsigned char digest
[64];
1706 drbd_csum_bio(mdev
, mdev
->tconn
->integrity_w_tfm
, req
->master_bio
, digest
);
1707 if (memcmp(p
+ 1, digest
, dgs
)) {
1709 "Digest mismatch, buffer modified by upper layers during write: %llus +%u\n",
1710 (unsigned long long)req
->i
.sector
, req
->i
.size
);
1712 } /* else if (dgs > 64) {
1713 ... Be noisy about digest too large ...
1716 mutex_unlock(&sock
->mutex
); /* locked by drbd_prepare_command() */
1721 /* answer packet, used to send data back for read requests:
1722 * Peer -> (diskless) R_PRIMARY (P_DATA_REPLY)
1723 * C_SYNC_SOURCE -> C_SYNC_TARGET (P_RS_DATA_REPLY)
1725 int drbd_send_block(struct drbd_conf
*mdev
, enum drbd_packet cmd
,
1726 struct drbd_peer_request
*peer_req
)
1728 struct drbd_socket
*sock
;
1733 dgs
= (mdev
->tconn
->agreed_pro_version
>= 87 && mdev
->tconn
->integrity_w_tfm
) ?
1734 crypto_hash_digestsize(mdev
->tconn
->integrity_w_tfm
) : 0;
1736 sock
= &mdev
->tconn
->data
;
1737 p
= drbd_prepare_command(mdev
, sock
);
1740 p
->sector
= cpu_to_be64(peer_req
->i
.sector
);
1741 p
->block_id
= peer_req
->block_id
;
1742 p
->seq_num
= 0; /* unused */
1744 drbd_csum_ee(mdev
, mdev
->tconn
->integrity_w_tfm
, peer_req
, p
+ 1);
1745 err
= __send_command(mdev
->tconn
, mdev
->vnr
, sock
, cmd
, sizeof(*p
) + dgs
, NULL
, peer_req
->i
.size
);
1747 err
= _drbd_send_zc_ee(mdev
, peer_req
);
1748 mutex_unlock(&sock
->mutex
); /* locked by drbd_prepare_command() */
1753 int drbd_send_out_of_sync(struct drbd_conf
*mdev
, struct drbd_request
*req
)
1755 struct drbd_socket
*sock
;
1756 struct p_block_desc
*p
;
1758 sock
= &mdev
->tconn
->data
;
1759 p
= drbd_prepare_command(mdev
, sock
);
1762 p
->sector
= cpu_to_be64(req
->i
.sector
);
1763 p
->blksize
= cpu_to_be32(req
->i
.size
);
1764 return drbd_send_command(mdev
, sock
, P_OUT_OF_SYNC
, sizeof(*p
), NULL
, 0);
1768 drbd_send distinguishes two cases:
1770 Packets sent via the data socket "sock"
1771 and packets sent via the meta data socket "msock"
1774 -----------------+-------------------------+------------------------------
1775 timeout conf.timeout / 2 conf.timeout / 2
1776 timeout action send a ping via msock Abort communication
1777 and close all sockets
1781 * you must have down()ed the appropriate [m]sock_mutex elsewhere!
1783 int drbd_send(struct drbd_tconn
*tconn
, struct socket
*sock
,
1784 void *buf
, size_t size
, unsigned msg_flags
)
1793 /* THINK if (signal_pending) return ... ? */
1798 msg
.msg_name
= NULL
;
1799 msg
.msg_namelen
= 0;
1800 msg
.msg_control
= NULL
;
1801 msg
.msg_controllen
= 0;
1802 msg
.msg_flags
= msg_flags
| MSG_NOSIGNAL
;
1804 if (sock
== tconn
->data
.socket
) {
1805 tconn
->ko_count
= tconn
->net_conf
->ko_count
;
1806 drbd_update_congested(tconn
);
1810 * tcp_sendmsg does _not_ use its size parameter at all ?
1812 * -EAGAIN on timeout, -EINTR on signal.
1815 * do we need to block DRBD_SIG if sock == &meta.socket ??
1816 * otherwise wake_asender() might interrupt some send_*Ack !
1818 rv
= kernel_sendmsg(sock
, &msg
, &iov
, 1, size
);
1819 if (rv
== -EAGAIN
) {
1820 if (we_should_drop_the_connection(tconn
, sock
))
1826 flush_signals(current
);
1834 } while (sent
< size
);
1836 if (sock
== tconn
->data
.socket
)
1837 clear_bit(NET_CONGESTED
, &tconn
->flags
);
1840 if (rv
!= -EAGAIN
) {
1841 conn_err(tconn
, "%s_sendmsg returned %d\n",
1842 sock
== tconn
->meta
.socket
? "msock" : "sock",
1844 conn_request_state(tconn
, NS(conn
, C_BROKEN_PIPE
), CS_HARD
);
1846 conn_request_state(tconn
, NS(conn
, C_TIMEOUT
), CS_HARD
);
1853 * drbd_send_all - Send an entire buffer
1855 * Returns 0 upon success and a negative error value otherwise.
1857 int drbd_send_all(struct drbd_tconn
*tconn
, struct socket
*sock
, void *buffer
,
1858 size_t size
, unsigned msg_flags
)
1862 err
= drbd_send(tconn
, sock
, buffer
, size
, msg_flags
);
1870 static int drbd_open(struct block_device
*bdev
, fmode_t mode
)
1872 struct drbd_conf
*mdev
= bdev
->bd_disk
->private_data
;
1873 unsigned long flags
;
1876 mutex_lock(&drbd_main_mutex
);
1877 spin_lock_irqsave(&mdev
->tconn
->req_lock
, flags
);
1878 /* to have a stable mdev->state.role
1879 * and no race with updating open_cnt */
1881 if (mdev
->state
.role
!= R_PRIMARY
) {
1882 if (mode
& FMODE_WRITE
)
1884 else if (!allow_oos
)
1890 spin_unlock_irqrestore(&mdev
->tconn
->req_lock
, flags
);
1891 mutex_unlock(&drbd_main_mutex
);
1896 static int drbd_release(struct gendisk
*gd
, fmode_t mode
)
1898 struct drbd_conf
*mdev
= gd
->private_data
;
1899 mutex_lock(&drbd_main_mutex
);
1901 mutex_unlock(&drbd_main_mutex
);
1905 static void drbd_set_defaults(struct drbd_conf
*mdev
)
1907 /* Beware! The actual layout differs
1908 * between big endian and little endian */
1909 mdev
->state
= (union drbd_dev_state
) {
1910 { .role
= R_SECONDARY
,
1912 .conn
= C_STANDALONE
,
1918 void drbd_init_set_defaults(struct drbd_conf
*mdev
)
1920 /* the memset(,0,) did most of this.
1921 * note: only assignments, no allocation in here */
1923 drbd_set_defaults(mdev
);
1925 atomic_set(&mdev
->ap_bio_cnt
, 0);
1926 atomic_set(&mdev
->ap_pending_cnt
, 0);
1927 atomic_set(&mdev
->rs_pending_cnt
, 0);
1928 atomic_set(&mdev
->unacked_cnt
, 0);
1929 atomic_set(&mdev
->local_cnt
, 0);
1930 atomic_set(&mdev
->pp_in_use_by_net
, 0);
1931 atomic_set(&mdev
->rs_sect_in
, 0);
1932 atomic_set(&mdev
->rs_sect_ev
, 0);
1933 atomic_set(&mdev
->ap_in_flight
, 0);
1935 mutex_init(&mdev
->md_io_mutex
);
1936 mutex_init(&mdev
->own_state_mutex
);
1937 mdev
->state_mutex
= &mdev
->own_state_mutex
;
1939 spin_lock_init(&mdev
->al_lock
);
1940 spin_lock_init(&mdev
->peer_seq_lock
);
1941 spin_lock_init(&mdev
->epoch_lock
);
1943 INIT_LIST_HEAD(&mdev
->active_ee
);
1944 INIT_LIST_HEAD(&mdev
->sync_ee
);
1945 INIT_LIST_HEAD(&mdev
->done_ee
);
1946 INIT_LIST_HEAD(&mdev
->read_ee
);
1947 INIT_LIST_HEAD(&mdev
->net_ee
);
1948 INIT_LIST_HEAD(&mdev
->resync_reads
);
1949 INIT_LIST_HEAD(&mdev
->resync_work
.list
);
1950 INIT_LIST_HEAD(&mdev
->unplug_work
.list
);
1951 INIT_LIST_HEAD(&mdev
->go_diskless
.list
);
1952 INIT_LIST_HEAD(&mdev
->md_sync_work
.list
);
1953 INIT_LIST_HEAD(&mdev
->start_resync_work
.list
);
1954 INIT_LIST_HEAD(&mdev
->bm_io_work
.w
.list
);
1956 mdev
->resync_work
.cb
= w_resync_timer
;
1957 mdev
->unplug_work
.cb
= w_send_write_hint
;
1958 mdev
->go_diskless
.cb
= w_go_diskless
;
1959 mdev
->md_sync_work
.cb
= w_md_sync
;
1960 mdev
->bm_io_work
.w
.cb
= w_bitmap_io
;
1961 mdev
->start_resync_work
.cb
= w_start_resync
;
1963 mdev
->resync_work
.mdev
= mdev
;
1964 mdev
->unplug_work
.mdev
= mdev
;
1965 mdev
->go_diskless
.mdev
= mdev
;
1966 mdev
->md_sync_work
.mdev
= mdev
;
1967 mdev
->bm_io_work
.w
.mdev
= mdev
;
1968 mdev
->start_resync_work
.mdev
= mdev
;
1970 init_timer(&mdev
->resync_timer
);
1971 init_timer(&mdev
->md_sync_timer
);
1972 init_timer(&mdev
->start_resync_timer
);
1973 init_timer(&mdev
->request_timer
);
1974 mdev
->resync_timer
.function
= resync_timer_fn
;
1975 mdev
->resync_timer
.data
= (unsigned long) mdev
;
1976 mdev
->md_sync_timer
.function
= md_sync_timer_fn
;
1977 mdev
->md_sync_timer
.data
= (unsigned long) mdev
;
1978 mdev
->start_resync_timer
.function
= start_resync_timer_fn
;
1979 mdev
->start_resync_timer
.data
= (unsigned long) mdev
;
1980 mdev
->request_timer
.function
= request_timer_fn
;
1981 mdev
->request_timer
.data
= (unsigned long) mdev
;
1983 init_waitqueue_head(&mdev
->misc_wait
);
1984 init_waitqueue_head(&mdev
->state_wait
);
1985 init_waitqueue_head(&mdev
->ee_wait
);
1986 init_waitqueue_head(&mdev
->al_wait
);
1987 init_waitqueue_head(&mdev
->seq_wait
);
1989 /* mdev->tconn->agreed_pro_version gets initialized in drbd_connect() */
1990 mdev
->write_ordering
= WO_bdev_flush
;
1991 mdev
->resync_wenr
= LC_FREE
;
1992 mdev
->peer_max_bio_size
= DRBD_MAX_BIO_SIZE_SAFE
;
1993 mdev
->local_max_bio_size
= DRBD_MAX_BIO_SIZE_SAFE
;
1996 void drbd_mdev_cleanup(struct drbd_conf
*mdev
)
1999 if (mdev
->tconn
->receiver
.t_state
!= NONE
)
2000 dev_err(DEV
, "ASSERT FAILED: receiver t_state == %d expected 0.\n",
2001 mdev
->tconn
->receiver
.t_state
);
2003 /* no need to lock it, I'm the only thread alive */
2004 if (atomic_read(&mdev
->current_epoch
->epoch_size
) != 0)
2005 dev_err(DEV
, "epoch_size:%d\n", atomic_read(&mdev
->current_epoch
->epoch_size
));
2015 mdev
->rs_failed
= 0;
2016 mdev
->rs_last_events
= 0;
2017 mdev
->rs_last_sect_ev
= 0;
2018 for (i
= 0; i
< DRBD_SYNC_MARKS
; i
++) {
2019 mdev
->rs_mark_left
[i
] = 0;
2020 mdev
->rs_mark_time
[i
] = 0;
2022 D_ASSERT(mdev
->tconn
->net_conf
== NULL
);
2024 drbd_set_my_capacity(mdev
, 0);
2026 /* maybe never allocated. */
2027 drbd_bm_resize(mdev
, 0, 1);
2028 drbd_bm_cleanup(mdev
);
2031 drbd_free_resources(mdev
);
2032 clear_bit(AL_SUSPENDED
, &mdev
->flags
);
2034 D_ASSERT(list_empty(&mdev
->active_ee
));
2035 D_ASSERT(list_empty(&mdev
->sync_ee
));
2036 D_ASSERT(list_empty(&mdev
->done_ee
));
2037 D_ASSERT(list_empty(&mdev
->read_ee
));
2038 D_ASSERT(list_empty(&mdev
->net_ee
));
2039 D_ASSERT(list_empty(&mdev
->resync_reads
));
2040 D_ASSERT(list_empty(&mdev
->tconn
->data
.work
.q
));
2041 D_ASSERT(list_empty(&mdev
->tconn
->meta
.work
.q
));
2042 D_ASSERT(list_empty(&mdev
->resync_work
.list
));
2043 D_ASSERT(list_empty(&mdev
->unplug_work
.list
));
2044 D_ASSERT(list_empty(&mdev
->go_diskless
.list
));
2046 drbd_set_defaults(mdev
);
2050 static void drbd_destroy_mempools(void)
2054 while (drbd_pp_pool
) {
2055 page
= drbd_pp_pool
;
2056 drbd_pp_pool
= (struct page
*)page_private(page
);
2061 /* D_ASSERT(atomic_read(&drbd_pp_vacant)==0); */
2063 if (drbd_md_io_bio_set
)
2064 bioset_free(drbd_md_io_bio_set
);
2065 if (drbd_md_io_page_pool
)
2066 mempool_destroy(drbd_md_io_page_pool
);
2067 if (drbd_ee_mempool
)
2068 mempool_destroy(drbd_ee_mempool
);
2069 if (drbd_request_mempool
)
2070 mempool_destroy(drbd_request_mempool
);
2072 kmem_cache_destroy(drbd_ee_cache
);
2073 if (drbd_request_cache
)
2074 kmem_cache_destroy(drbd_request_cache
);
2075 if (drbd_bm_ext_cache
)
2076 kmem_cache_destroy(drbd_bm_ext_cache
);
2077 if (drbd_al_ext_cache
)
2078 kmem_cache_destroy(drbd_al_ext_cache
);
2080 drbd_md_io_bio_set
= NULL
;
2081 drbd_md_io_page_pool
= NULL
;
2082 drbd_ee_mempool
= NULL
;
2083 drbd_request_mempool
= NULL
;
2084 drbd_ee_cache
= NULL
;
2085 drbd_request_cache
= NULL
;
2086 drbd_bm_ext_cache
= NULL
;
2087 drbd_al_ext_cache
= NULL
;
2092 static int drbd_create_mempools(void)
2095 const int number
= (DRBD_MAX_BIO_SIZE
/PAGE_SIZE
) * minor_count
;
2098 /* prepare our caches and mempools */
2099 drbd_request_mempool
= NULL
;
2100 drbd_ee_cache
= NULL
;
2101 drbd_request_cache
= NULL
;
2102 drbd_bm_ext_cache
= NULL
;
2103 drbd_al_ext_cache
= NULL
;
2104 drbd_pp_pool
= NULL
;
2105 drbd_md_io_page_pool
= NULL
;
2106 drbd_md_io_bio_set
= NULL
;
2109 drbd_request_cache
= kmem_cache_create(
2110 "drbd_req", sizeof(struct drbd_request
), 0, 0, NULL
);
2111 if (drbd_request_cache
== NULL
)
2114 drbd_ee_cache
= kmem_cache_create(
2115 "drbd_ee", sizeof(struct drbd_peer_request
), 0, 0, NULL
);
2116 if (drbd_ee_cache
== NULL
)
2119 drbd_bm_ext_cache
= kmem_cache_create(
2120 "drbd_bm", sizeof(struct bm_extent
), 0, 0, NULL
);
2121 if (drbd_bm_ext_cache
== NULL
)
2124 drbd_al_ext_cache
= kmem_cache_create(
2125 "drbd_al", sizeof(struct lc_element
), 0, 0, NULL
);
2126 if (drbd_al_ext_cache
== NULL
)
2130 drbd_md_io_bio_set
= bioset_create(DRBD_MIN_POOL_PAGES
, 0);
2131 if (drbd_md_io_bio_set
== NULL
)
2134 drbd_md_io_page_pool
= mempool_create_page_pool(DRBD_MIN_POOL_PAGES
, 0);
2135 if (drbd_md_io_page_pool
== NULL
)
2138 drbd_request_mempool
= mempool_create(number
,
2139 mempool_alloc_slab
, mempool_free_slab
, drbd_request_cache
);
2140 if (drbd_request_mempool
== NULL
)
2143 drbd_ee_mempool
= mempool_create(number
,
2144 mempool_alloc_slab
, mempool_free_slab
, drbd_ee_cache
);
2145 if (drbd_ee_mempool
== NULL
)
2148 /* drbd's page pool */
2149 spin_lock_init(&drbd_pp_lock
);
2151 for (i
= 0; i
< number
; i
++) {
2152 page
= alloc_page(GFP_HIGHUSER
);
2155 set_page_private(page
, (unsigned long)drbd_pp_pool
);
2156 drbd_pp_pool
= page
;
2158 drbd_pp_vacant
= number
;
2163 drbd_destroy_mempools(); /* in case we allocated some */
2167 static int drbd_notify_sys(struct notifier_block
*this, unsigned long code
,
2170 /* just so we have it. you never know what interesting things we
2171 * might want to do here some day...
2177 static struct notifier_block drbd_notifier
= {
2178 .notifier_call
= drbd_notify_sys
,
2181 static void drbd_release_all_peer_reqs(struct drbd_conf
*mdev
)
2185 rr
= drbd_free_peer_reqs(mdev
, &mdev
->active_ee
);
2187 dev_err(DEV
, "%d EEs in active list found!\n", rr
);
2189 rr
= drbd_free_peer_reqs(mdev
, &mdev
->sync_ee
);
2191 dev_err(DEV
, "%d EEs in sync list found!\n", rr
);
2193 rr
= drbd_free_peer_reqs(mdev
, &mdev
->read_ee
);
2195 dev_err(DEV
, "%d EEs in read list found!\n", rr
);
2197 rr
= drbd_free_peer_reqs(mdev
, &mdev
->done_ee
);
2199 dev_err(DEV
, "%d EEs in done list found!\n", rr
);
2201 rr
= drbd_free_peer_reqs(mdev
, &mdev
->net_ee
);
2203 dev_err(DEV
, "%d EEs in net list found!\n", rr
);
2206 /* caution. no locking. */
2207 void drbd_delete_device(struct drbd_conf
*mdev
)
2209 idr_remove(&mdev
->tconn
->volumes
, mdev
->vnr
);
2210 idr_remove(&minors
, mdev_to_minor(mdev
));
2213 /* paranoia asserts */
2214 D_ASSERT(mdev
->open_cnt
== 0);
2215 D_ASSERT(list_empty(&mdev
->tconn
->data
.work
.q
));
2216 /* end paranoia asserts */
2218 del_gendisk(mdev
->vdisk
);
2220 /* cleanup stuff that may have been allocated during
2221 * device (re-)configuration or state changes */
2223 if (mdev
->this_bdev
)
2224 bdput(mdev
->this_bdev
);
2226 drbd_free_resources(mdev
);
2228 drbd_release_all_peer_reqs(mdev
);
2230 lc_destroy(mdev
->act_log
);
2231 lc_destroy(mdev
->resync
);
2233 kfree(mdev
->p_uuid
);
2234 /* mdev->p_uuid = NULL; */
2236 kfree(mdev
->current_epoch
);
2237 if (mdev
->bitmap
) /* should no longer be there. */
2238 drbd_bm_cleanup(mdev
);
2239 __free_page(mdev
->md_io_page
);
2240 put_disk(mdev
->vdisk
);
2241 blk_cleanup_queue(mdev
->rq_queue
);
2245 static void drbd_cleanup(void)
2248 struct drbd_conf
*mdev
;
2250 unregister_reboot_notifier(&drbd_notifier
);
2252 /* first remove proc,
2253 * drbdsetup uses it's presence to detect
2254 * whether DRBD is loaded.
2255 * If we would get stuck in proc removal,
2256 * but have netlink already deregistered,
2257 * some drbdsetup commands may wait forever
2261 remove_proc_entry("drbd", NULL
);
2263 drbd_genl_unregister();
2265 idr_for_each_entry(&minors
, mdev
, i
)
2266 drbd_delete_device(mdev
);
2268 drbd_destroy_mempools();
2269 unregister_blkdev(DRBD_MAJOR
, "drbd");
2271 idr_destroy(&minors
);
2273 printk(KERN_INFO
"drbd: module cleanup done.\n");
2277 * drbd_congested() - Callback for pdflush
2278 * @congested_data: User data
2279 * @bdi_bits: Bits pdflush is currently interested in
2281 * Returns 1<<BDI_async_congested and/or 1<<BDI_sync_congested if we are congested.
2283 static int drbd_congested(void *congested_data
, int bdi_bits
)
2285 struct drbd_conf
*mdev
= congested_data
;
2286 struct request_queue
*q
;
2290 if (!may_inc_ap_bio(mdev
)) {
2291 /* DRBD has frozen IO */
2297 if (get_ldev(mdev
)) {
2298 q
= bdev_get_queue(mdev
->ldev
->backing_bdev
);
2299 r
= bdi_congested(&q
->backing_dev_info
, bdi_bits
);
2305 if (bdi_bits
& (1 << BDI_async_congested
) && test_bit(NET_CONGESTED
, &mdev
->tconn
->flags
)) {
2306 r
|= (1 << BDI_async_congested
);
2307 reason
= reason
== 'b' ? 'a' : 'n';
2311 mdev
->congestion_reason
= reason
;
2315 static void drbd_init_workqueue(struct drbd_work_queue
* wq
)
2317 sema_init(&wq
->s
, 0);
2318 spin_lock_init(&wq
->q_lock
);
2319 INIT_LIST_HEAD(&wq
->q
);
2322 struct drbd_tconn
*conn_by_name(const char *name
)
2324 struct drbd_tconn
*tconn
;
2326 if (!name
|| !name
[0])
2329 mutex_lock(&drbd_cfg_mutex
);
2330 list_for_each_entry(tconn
, &drbd_tconns
, all_tconn
) {
2331 if (!strcmp(tconn
->name
, name
))
2336 mutex_unlock(&drbd_cfg_mutex
);
2340 static int drbd_alloc_socket(struct drbd_socket
*socket
)
2342 socket
->rbuf
= (void *) __get_free_page(GFP_KERNEL
);
2345 socket
->sbuf
= (void *) __get_free_page(GFP_KERNEL
);
2351 static void drbd_free_socket(struct drbd_socket
*socket
)
2353 free_page((unsigned long) socket
->sbuf
);
2354 free_page((unsigned long) socket
->rbuf
);
2357 struct drbd_tconn
*drbd_new_tconn(const char *name
)
2359 struct drbd_tconn
*tconn
;
2361 tconn
= kzalloc(sizeof(struct drbd_tconn
), GFP_KERNEL
);
2365 tconn
->name
= kstrdup(name
, GFP_KERNEL
);
2369 if (drbd_alloc_socket(&tconn
->data
))
2371 if (drbd_alloc_socket(&tconn
->meta
))
2374 if (!zalloc_cpumask_var(&tconn
->cpu_mask
, GFP_KERNEL
))
2377 if (!tl_init(tconn
))
2380 tconn
->cstate
= C_STANDALONE
;
2381 mutex_init(&tconn
->cstate_mutex
);
2382 spin_lock_init(&tconn
->req_lock
);
2383 atomic_set(&tconn
->net_cnt
, 0);
2384 init_waitqueue_head(&tconn
->net_cnt_wait
);
2385 init_waitqueue_head(&tconn
->ping_wait
);
2386 idr_init(&tconn
->volumes
);
2388 drbd_init_workqueue(&tconn
->data
.work
);
2389 mutex_init(&tconn
->data
.mutex
);
2391 drbd_init_workqueue(&tconn
->meta
.work
);
2392 mutex_init(&tconn
->meta
.mutex
);
2394 drbd_thread_init(tconn
, &tconn
->receiver
, drbdd_init
, "receiver");
2395 drbd_thread_init(tconn
, &tconn
->worker
, drbd_worker
, "worker");
2396 drbd_thread_init(tconn
, &tconn
->asender
, drbd_asender
, "asender");
2398 tconn
->res_opts
= (struct res_opts
) {
2399 {}, 0, /* cpu_mask */
2400 DRBD_ON_NO_DATA_DEF
, /* on_no_data */
2403 mutex_lock(&drbd_cfg_mutex
);
2404 list_add_tail(&tconn
->all_tconn
, &drbd_tconns
);
2405 mutex_unlock(&drbd_cfg_mutex
);
2411 free_cpumask_var(tconn
->cpu_mask
);
2412 drbd_free_socket(&tconn
->meta
);
2413 drbd_free_socket(&tconn
->data
);
2420 void drbd_free_tconn(struct drbd_tconn
*tconn
)
2422 list_del(&tconn
->all_tconn
);
2423 idr_destroy(&tconn
->volumes
);
2425 free_cpumask_var(tconn
->cpu_mask
);
2426 drbd_free_socket(&tconn
->meta
);
2427 drbd_free_socket(&tconn
->data
);
2429 kfree(tconn
->int_dig_in
);
2430 kfree(tconn
->int_dig_vv
);
2434 enum drbd_ret_code
conn_new_minor(struct drbd_tconn
*tconn
, unsigned int minor
, int vnr
)
2436 struct drbd_conf
*mdev
;
2437 struct gendisk
*disk
;
2438 struct request_queue
*q
;
2440 int minor_got
= minor
;
2441 enum drbd_ret_code err
= ERR_NOMEM
;
2443 mdev
= minor_to_mdev(minor
);
2445 return ERR_MINOR_EXISTS
;
2447 /* GFP_KERNEL, we are outside of all write-out paths */
2448 mdev
= kzalloc(sizeof(struct drbd_conf
), GFP_KERNEL
);
2452 mdev
->tconn
= tconn
;
2453 mdev
->minor
= minor
;
2456 drbd_init_set_defaults(mdev
);
2458 q
= blk_alloc_queue(GFP_KERNEL
);
2462 q
->queuedata
= mdev
;
2464 disk
= alloc_disk(1);
2469 set_disk_ro(disk
, true);
2472 disk
->major
= DRBD_MAJOR
;
2473 disk
->first_minor
= minor
;
2474 disk
->fops
= &drbd_ops
;
2475 sprintf(disk
->disk_name
, "drbd%d", minor
);
2476 disk
->private_data
= mdev
;
2478 mdev
->this_bdev
= bdget(MKDEV(DRBD_MAJOR
, minor
));
2479 /* we have no partitions. we contain only ourselves. */
2480 mdev
->this_bdev
->bd_contains
= mdev
->this_bdev
;
2482 q
->backing_dev_info
.congested_fn
= drbd_congested
;
2483 q
->backing_dev_info
.congested_data
= mdev
;
2485 blk_queue_make_request(q
, drbd_make_request
);
2486 /* Setting the max_hw_sectors to an odd value of 8kibyte here
2487 This triggers a max_bio_size message upon first attach or connect */
2488 blk_queue_max_hw_sectors(q
, DRBD_MAX_BIO_SIZE_SAFE
>> 8);
2489 blk_queue_bounce_limit(q
, BLK_BOUNCE_ANY
);
2490 blk_queue_merge_bvec(q
, drbd_merge_bvec
);
2491 q
->queue_lock
= &mdev
->tconn
->req_lock
; /* needed since we use */
2493 mdev
->md_io_page
= alloc_page(GFP_KERNEL
);
2494 if (!mdev
->md_io_page
)
2495 goto out_no_io_page
;
2497 if (drbd_bm_init(mdev
))
2499 mdev
->read_requests
= RB_ROOT
;
2500 mdev
->write_requests
= RB_ROOT
;
2502 mdev
->current_epoch
= kzalloc(sizeof(struct drbd_epoch
), GFP_KERNEL
);
2503 if (!mdev
->current_epoch
)
2506 INIT_LIST_HEAD(&mdev
->current_epoch
->list
);
2509 if (!idr_pre_get(&minors
, GFP_KERNEL
))
2510 goto out_no_minor_idr
;
2511 if (idr_get_new_above(&minors
, mdev
, minor
, &minor_got
))
2512 goto out_no_minor_idr
;
2513 if (minor_got
!= minor
) {
2514 err
= ERR_MINOR_EXISTS
;
2515 drbd_msg_put_info("requested minor exists already");
2516 goto out_idr_remove_minor
;
2519 if (!idr_pre_get(&tconn
->volumes
, GFP_KERNEL
))
2520 goto out_idr_remove_minor
;
2521 if (idr_get_new_above(&tconn
->volumes
, mdev
, vnr
, &vnr_got
))
2522 goto out_idr_remove_minor
;
2523 if (vnr_got
!= vnr
) {
2524 err
= ERR_INVALID_REQUEST
;
2525 drbd_msg_put_info("requested volume exists already");
2526 goto out_idr_remove_vol
;
2530 /* inherit the connection state */
2531 mdev
->state
.conn
= tconn
->cstate
;
2532 if (mdev
->state
.conn
== C_WF_REPORT_PARAMS
)
2533 drbd_connected(vnr
, mdev
, tconn
);
2538 idr_remove(&tconn
->volumes
, vnr_got
);
2539 out_idr_remove_minor
:
2540 idr_remove(&minors
, minor_got
);
2543 kfree(mdev
->current_epoch
);
2545 drbd_bm_cleanup(mdev
);
2547 __free_page(mdev
->md_io_page
);
2551 blk_cleanup_queue(q
);
2557 int __init
drbd_init(void)
2561 if (minor_count
< DRBD_MINOR_COUNT_MIN
|| minor_count
> DRBD_MINOR_COUNT_MAX
) {
2563 "drbd: invalid minor_count (%d)\n", minor_count
);
2571 err
= register_blkdev(DRBD_MAJOR
, "drbd");
2574 "drbd: unable to register block device major %d\n",
2579 err
= drbd_genl_register();
2581 printk(KERN_ERR
"drbd: unable to register generic netlink family\n");
2586 register_reboot_notifier(&drbd_notifier
);
2589 * allocate all necessary structs
2593 init_waitqueue_head(&drbd_pp_wait
);
2595 drbd_proc
= NULL
; /* play safe for drbd_cleanup */
2598 err
= drbd_create_mempools();
2602 drbd_proc
= proc_create_data("drbd", S_IFREG
| S_IRUGO
, NULL
, &drbd_proc_fops
, NULL
);
2604 printk(KERN_ERR
"drbd: unable to register proc file\n");
2608 rwlock_init(&global_state_lock
);
2609 INIT_LIST_HEAD(&drbd_tconns
);
2611 printk(KERN_INFO
"drbd: initialized. "
2612 "Version: " REL_VERSION
" (api:%d/proto:%d-%d)\n",
2613 API_VERSION
, PRO_VERSION_MIN
, PRO_VERSION_MAX
);
2614 printk(KERN_INFO
"drbd: %s\n", drbd_buildtag());
2615 printk(KERN_INFO
"drbd: registered as block device major %d\n",
2618 return 0; /* Success! */
2623 /* currently always the case */
2624 printk(KERN_ERR
"drbd: ran out of memory\n");
2626 printk(KERN_ERR
"drbd: initialization failure\n");
2630 void drbd_free_bc(struct drbd_backing_dev
*ldev
)
2635 blkdev_put(ldev
->backing_bdev
, FMODE_READ
| FMODE_WRITE
| FMODE_EXCL
);
2636 blkdev_put(ldev
->md_bdev
, FMODE_READ
| FMODE_WRITE
| FMODE_EXCL
);
2641 void drbd_free_sock(struct drbd_tconn
*tconn
)
2643 if (tconn
->data
.socket
) {
2644 mutex_lock(&tconn
->data
.mutex
);
2645 kernel_sock_shutdown(tconn
->data
.socket
, SHUT_RDWR
);
2646 sock_release(tconn
->data
.socket
);
2647 tconn
->data
.socket
= NULL
;
2648 mutex_unlock(&tconn
->data
.mutex
);
2650 if (tconn
->meta
.socket
) {
2651 mutex_lock(&tconn
->meta
.mutex
);
2652 kernel_sock_shutdown(tconn
->meta
.socket
, SHUT_RDWR
);
2653 sock_release(tconn
->meta
.socket
);
2654 tconn
->meta
.socket
= NULL
;
2655 mutex_unlock(&tconn
->meta
.mutex
);
2660 void drbd_free_resources(struct drbd_conf
*mdev
)
2662 crypto_free_hash(mdev
->tconn
->csums_tfm
);
2663 mdev
->tconn
->csums_tfm
= NULL
;
2664 crypto_free_hash(mdev
->tconn
->verify_tfm
);
2665 mdev
->tconn
->verify_tfm
= NULL
;
2666 crypto_free_hash(mdev
->tconn
->cram_hmac_tfm
);
2667 mdev
->tconn
->cram_hmac_tfm
= NULL
;
2668 crypto_free_hash(mdev
->tconn
->integrity_w_tfm
);
2669 mdev
->tconn
->integrity_w_tfm
= NULL
;
2670 crypto_free_hash(mdev
->tconn
->integrity_r_tfm
);
2671 mdev
->tconn
->integrity_r_tfm
= NULL
;
2673 drbd_free_sock(mdev
->tconn
);
2676 drbd_free_bc(mdev
->ldev
);
2677 mdev
->ldev
= NULL
;);
2680 /* meta data management */
2682 struct meta_data_on_disk
{
2683 u64 la_size
; /* last agreed size. */
2684 u64 uuid
[UI_SIZE
]; /* UUIDs. */
2687 u32 flags
; /* MDF */
2690 u32 al_offset
; /* offset to this block */
2691 u32 al_nr_extents
; /* important for restoring the AL */
2692 /* `-- act_log->nr_elements <-- ldev->dc.al_extents */
2693 u32 bm_offset
; /* offset to the bitmap, from here */
2694 u32 bm_bytes_per_bit
; /* BM_BLOCK_SIZE */
2695 u32 la_peer_max_bio_size
; /* last peer max_bio_size */
2696 u32 reserved_u32
[3];
2701 * drbd_md_sync() - Writes the meta data super block if the MD_DIRTY flag bit is set
2702 * @mdev: DRBD device.
2704 void drbd_md_sync(struct drbd_conf
*mdev
)
2706 struct meta_data_on_disk
*buffer
;
2710 del_timer(&mdev
->md_sync_timer
);
2711 /* timer may be rearmed by drbd_md_mark_dirty() now. */
2712 if (!test_and_clear_bit(MD_DIRTY
, &mdev
->flags
))
2715 /* We use here D_FAILED and not D_ATTACHING because we try to write
2716 * metadata even if we detach due to a disk failure! */
2717 if (!get_ldev_if_state(mdev
, D_FAILED
))
2720 mutex_lock(&mdev
->md_io_mutex
);
2721 buffer
= (struct meta_data_on_disk
*)page_address(mdev
->md_io_page
);
2722 memset(buffer
, 0, 512);
2724 buffer
->la_size
= cpu_to_be64(drbd_get_capacity(mdev
->this_bdev
));
2725 for (i
= UI_CURRENT
; i
< UI_SIZE
; i
++)
2726 buffer
->uuid
[i
] = cpu_to_be64(mdev
->ldev
->md
.uuid
[i
]);
2727 buffer
->flags
= cpu_to_be32(mdev
->ldev
->md
.flags
);
2728 buffer
->magic
= cpu_to_be32(DRBD_MD_MAGIC
);
2730 buffer
->md_size_sect
= cpu_to_be32(mdev
->ldev
->md
.md_size_sect
);
2731 buffer
->al_offset
= cpu_to_be32(mdev
->ldev
->md
.al_offset
);
2732 buffer
->al_nr_extents
= cpu_to_be32(mdev
->act_log
->nr_elements
);
2733 buffer
->bm_bytes_per_bit
= cpu_to_be32(BM_BLOCK_SIZE
);
2734 buffer
->device_uuid
= cpu_to_be64(mdev
->ldev
->md
.device_uuid
);
2736 buffer
->bm_offset
= cpu_to_be32(mdev
->ldev
->md
.bm_offset
);
2737 buffer
->la_peer_max_bio_size
= cpu_to_be32(mdev
->peer_max_bio_size
);
2739 D_ASSERT(drbd_md_ss__(mdev
, mdev
->ldev
) == mdev
->ldev
->md
.md_offset
);
2740 sector
= mdev
->ldev
->md
.md_offset
;
2742 if (drbd_md_sync_page_io(mdev
, mdev
->ldev
, sector
, WRITE
)) {
2743 /* this was a try anyways ... */
2744 dev_err(DEV
, "meta data update failed!\n");
2745 drbd_chk_io_error(mdev
, 1, true);
2748 /* Update mdev->ldev->md.la_size_sect,
2749 * since we updated it on metadata. */
2750 mdev
->ldev
->md
.la_size_sect
= drbd_get_capacity(mdev
->this_bdev
);
2752 mutex_unlock(&mdev
->md_io_mutex
);
2757 * drbd_md_read() - Reads in the meta data super block
2758 * @mdev: DRBD device.
2759 * @bdev: Device from which the meta data should be read in.
2761 * Return 0 (NO_ERROR) on success, and an enum drbd_ret_code in case
2762 * something goes wrong. Currently only: ERR_IO_MD_DISK, ERR_MD_INVALID.
2764 int drbd_md_read(struct drbd_conf
*mdev
, struct drbd_backing_dev
*bdev
)
2766 struct meta_data_on_disk
*buffer
;
2767 int i
, rv
= NO_ERROR
;
2769 if (!get_ldev_if_state(mdev
, D_ATTACHING
))
2770 return ERR_IO_MD_DISK
;
2772 mutex_lock(&mdev
->md_io_mutex
);
2773 buffer
= (struct meta_data_on_disk
*)page_address(mdev
->md_io_page
);
2775 if (drbd_md_sync_page_io(mdev
, bdev
, bdev
->md
.md_offset
, READ
)) {
2776 /* NOTE: can't do normal error processing here as this is
2777 called BEFORE disk is attached */
2778 dev_err(DEV
, "Error while reading metadata.\n");
2779 rv
= ERR_IO_MD_DISK
;
2783 if (buffer
->magic
!= cpu_to_be32(DRBD_MD_MAGIC
)) {
2784 dev_err(DEV
, "Error while reading metadata, magic not found.\n");
2785 rv
= ERR_MD_INVALID
;
2788 if (be32_to_cpu(buffer
->al_offset
) != bdev
->md
.al_offset
) {
2789 dev_err(DEV
, "unexpected al_offset: %d (expected %d)\n",
2790 be32_to_cpu(buffer
->al_offset
), bdev
->md
.al_offset
);
2791 rv
= ERR_MD_INVALID
;
2794 if (be32_to_cpu(buffer
->bm_offset
) != bdev
->md
.bm_offset
) {
2795 dev_err(DEV
, "unexpected bm_offset: %d (expected %d)\n",
2796 be32_to_cpu(buffer
->bm_offset
), bdev
->md
.bm_offset
);
2797 rv
= ERR_MD_INVALID
;
2800 if (be32_to_cpu(buffer
->md_size_sect
) != bdev
->md
.md_size_sect
) {
2801 dev_err(DEV
, "unexpected md_size: %u (expected %u)\n",
2802 be32_to_cpu(buffer
->md_size_sect
), bdev
->md
.md_size_sect
);
2803 rv
= ERR_MD_INVALID
;
2807 if (be32_to_cpu(buffer
->bm_bytes_per_bit
) != BM_BLOCK_SIZE
) {
2808 dev_err(DEV
, "unexpected bm_bytes_per_bit: %u (expected %u)\n",
2809 be32_to_cpu(buffer
->bm_bytes_per_bit
), BM_BLOCK_SIZE
);
2810 rv
= ERR_MD_INVALID
;
2814 bdev
->md
.la_size_sect
= be64_to_cpu(buffer
->la_size
);
2815 for (i
= UI_CURRENT
; i
< UI_SIZE
; i
++)
2816 bdev
->md
.uuid
[i
] = be64_to_cpu(buffer
->uuid
[i
]);
2817 bdev
->md
.flags
= be32_to_cpu(buffer
->flags
);
2818 bdev
->dc
.al_extents
= be32_to_cpu(buffer
->al_nr_extents
);
2819 bdev
->md
.device_uuid
= be64_to_cpu(buffer
->device_uuid
);
2821 spin_lock_irq(&mdev
->tconn
->req_lock
);
2822 if (mdev
->state
.conn
< C_CONNECTED
) {
2824 peer
= be32_to_cpu(buffer
->la_peer_max_bio_size
);
2825 peer
= max_t(int, peer
, DRBD_MAX_BIO_SIZE_SAFE
);
2826 mdev
->peer_max_bio_size
= peer
;
2828 spin_unlock_irq(&mdev
->tconn
->req_lock
);
2830 if (bdev
->dc
.al_extents
< 7)
2831 bdev
->dc
.al_extents
= 127;
2834 mutex_unlock(&mdev
->md_io_mutex
);
2841 * drbd_md_mark_dirty() - Mark meta data super block as dirty
2842 * @mdev: DRBD device.
2844 * Call this function if you change anything that should be written to
2845 * the meta-data super block. This function sets MD_DIRTY, and starts a
2846 * timer that ensures that within five seconds you have to call drbd_md_sync().
2849 void drbd_md_mark_dirty_(struct drbd_conf
*mdev
, unsigned int line
, const char *func
)
2851 if (!test_and_set_bit(MD_DIRTY
, &mdev
->flags
)) {
2852 mod_timer(&mdev
->md_sync_timer
, jiffies
+ HZ
);
2853 mdev
->last_md_mark_dirty
.line
= line
;
2854 mdev
->last_md_mark_dirty
.func
= func
;
2858 void drbd_md_mark_dirty(struct drbd_conf
*mdev
)
2860 if (!test_and_set_bit(MD_DIRTY
, &mdev
->flags
))
2861 mod_timer(&mdev
->md_sync_timer
, jiffies
+ 5*HZ
);
2865 static void drbd_uuid_move_history(struct drbd_conf
*mdev
) __must_hold(local
)
2869 for (i
= UI_HISTORY_START
; i
< UI_HISTORY_END
; i
++)
2870 mdev
->ldev
->md
.uuid
[i
+1] = mdev
->ldev
->md
.uuid
[i
];
2873 void _drbd_uuid_set(struct drbd_conf
*mdev
, int idx
, u64 val
) __must_hold(local
)
2875 if (idx
== UI_CURRENT
) {
2876 if (mdev
->state
.role
== R_PRIMARY
)
2881 drbd_set_ed_uuid(mdev
, val
);
2884 mdev
->ldev
->md
.uuid
[idx
] = val
;
2885 drbd_md_mark_dirty(mdev
);
2889 void drbd_uuid_set(struct drbd_conf
*mdev
, int idx
, u64 val
) __must_hold(local
)
2891 if (mdev
->ldev
->md
.uuid
[idx
]) {
2892 drbd_uuid_move_history(mdev
);
2893 mdev
->ldev
->md
.uuid
[UI_HISTORY_START
] = mdev
->ldev
->md
.uuid
[idx
];
2895 _drbd_uuid_set(mdev
, idx
, val
);
2899 * drbd_uuid_new_current() - Creates a new current UUID
2900 * @mdev: DRBD device.
2902 * Creates a new current UUID, and rotates the old current UUID into
2903 * the bitmap slot. Causes an incremental resync upon next connect.
2905 void drbd_uuid_new_current(struct drbd_conf
*mdev
) __must_hold(local
)
2908 unsigned long long bm_uuid
= mdev
->ldev
->md
.uuid
[UI_BITMAP
];
2911 dev_warn(DEV
, "bm UUID was already set: %llX\n", bm_uuid
);
2913 mdev
->ldev
->md
.uuid
[UI_BITMAP
] = mdev
->ldev
->md
.uuid
[UI_CURRENT
];
2915 get_random_bytes(&val
, sizeof(u64
));
2916 _drbd_uuid_set(mdev
, UI_CURRENT
, val
);
2917 drbd_print_uuids(mdev
, "new current UUID");
2918 /* get it to stable storage _now_ */
2922 void drbd_uuid_set_bm(struct drbd_conf
*mdev
, u64 val
) __must_hold(local
)
2924 if (mdev
->ldev
->md
.uuid
[UI_BITMAP
] == 0 && val
== 0)
2928 drbd_uuid_move_history(mdev
);
2929 mdev
->ldev
->md
.uuid
[UI_HISTORY_START
] = mdev
->ldev
->md
.uuid
[UI_BITMAP
];
2930 mdev
->ldev
->md
.uuid
[UI_BITMAP
] = 0;
2932 unsigned long long bm_uuid
= mdev
->ldev
->md
.uuid
[UI_BITMAP
];
2934 dev_warn(DEV
, "bm UUID was already set: %llX\n", bm_uuid
);
2936 mdev
->ldev
->md
.uuid
[UI_BITMAP
] = val
& ~((u64
)1);
2938 drbd_md_mark_dirty(mdev
);
2942 * drbd_bmio_set_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
2943 * @mdev: DRBD device.
2945 * Sets all bits in the bitmap and writes the whole bitmap to stable storage.
2947 int drbd_bmio_set_n_write(struct drbd_conf
*mdev
)
2951 if (get_ldev_if_state(mdev
, D_ATTACHING
)) {
2952 drbd_md_set_flag(mdev
, MDF_FULL_SYNC
);
2954 drbd_bm_set_all(mdev
);
2956 rv
= drbd_bm_write(mdev
);
2959 drbd_md_clear_flag(mdev
, MDF_FULL_SYNC
);
2970 * drbd_bmio_clear_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
2971 * @mdev: DRBD device.
2973 * Clears all bits in the bitmap and writes the whole bitmap to stable storage.
2975 int drbd_bmio_clear_n_write(struct drbd_conf
*mdev
)
2979 drbd_resume_al(mdev
);
2980 if (get_ldev_if_state(mdev
, D_ATTACHING
)) {
2981 drbd_bm_clear_all(mdev
);
2982 rv
= drbd_bm_write(mdev
);
2989 static int w_bitmap_io(struct drbd_work
*w
, int unused
)
2991 struct bm_io_work
*work
= container_of(w
, struct bm_io_work
, w
);
2992 struct drbd_conf
*mdev
= w
->mdev
;
2995 D_ASSERT(atomic_read(&mdev
->ap_bio_cnt
) == 0);
2997 if (get_ldev(mdev
)) {
2998 drbd_bm_lock(mdev
, work
->why
, work
->flags
);
2999 rv
= work
->io_fn(mdev
);
3000 drbd_bm_unlock(mdev
);
3004 clear_bit_unlock(BITMAP_IO
, &mdev
->flags
);
3005 wake_up(&mdev
->misc_wait
);
3008 work
->done(mdev
, rv
);
3010 clear_bit(BITMAP_IO_QUEUED
, &mdev
->flags
);
3017 void drbd_ldev_destroy(struct drbd_conf
*mdev
)
3019 lc_destroy(mdev
->resync
);
3020 mdev
->resync
= NULL
;
3021 lc_destroy(mdev
->act_log
);
3022 mdev
->act_log
= NULL
;
3024 drbd_free_bc(mdev
->ldev
);
3025 mdev
->ldev
= NULL
;);
3027 clear_bit(GO_DISKLESS
, &mdev
->flags
);
3030 static int w_go_diskless(struct drbd_work
*w
, int unused
)
3032 struct drbd_conf
*mdev
= w
->mdev
;
3034 D_ASSERT(mdev
->state
.disk
== D_FAILED
);
3035 /* we cannot assert local_cnt == 0 here, as get_ldev_if_state will
3036 * inc/dec it frequently. Once we are D_DISKLESS, no one will touch
3037 * the protected members anymore, though, so once put_ldev reaches zero
3038 * again, it will be safe to free them. */
3039 drbd_force_state(mdev
, NS(disk
, D_DISKLESS
));
3043 void drbd_go_diskless(struct drbd_conf
*mdev
)
3045 D_ASSERT(mdev
->state
.disk
== D_FAILED
);
3046 if (!test_and_set_bit(GO_DISKLESS
, &mdev
->flags
))
3047 drbd_queue_work(&mdev
->tconn
->data
.work
, &mdev
->go_diskless
);
3051 * drbd_queue_bitmap_io() - Queues an IO operation on the whole bitmap
3052 * @mdev: DRBD device.
3053 * @io_fn: IO callback to be called when bitmap IO is possible
3054 * @done: callback to be called after the bitmap IO was performed
3055 * @why: Descriptive text of the reason for doing the IO
3057 * While IO on the bitmap happens we freeze application IO thus we ensure
3058 * that drbd_set_out_of_sync() can not be called. This function MAY ONLY be
3059 * called from worker context. It MUST NOT be used while a previous such
3060 * work is still pending!
3062 void drbd_queue_bitmap_io(struct drbd_conf
*mdev
,
3063 int (*io_fn
)(struct drbd_conf
*),
3064 void (*done
)(struct drbd_conf
*, int),
3065 char *why
, enum bm_flag flags
)
3067 D_ASSERT(current
== mdev
->tconn
->worker
.task
);
3069 D_ASSERT(!test_bit(BITMAP_IO_QUEUED
, &mdev
->flags
));
3070 D_ASSERT(!test_bit(BITMAP_IO
, &mdev
->flags
));
3071 D_ASSERT(list_empty(&mdev
->bm_io_work
.w
.list
));
3072 if (mdev
->bm_io_work
.why
)
3073 dev_err(DEV
, "FIXME going to queue '%s' but '%s' still pending?\n",
3074 why
, mdev
->bm_io_work
.why
);
3076 mdev
->bm_io_work
.io_fn
= io_fn
;
3077 mdev
->bm_io_work
.done
= done
;
3078 mdev
->bm_io_work
.why
= why
;
3079 mdev
->bm_io_work
.flags
= flags
;
3081 spin_lock_irq(&mdev
->tconn
->req_lock
);
3082 set_bit(BITMAP_IO
, &mdev
->flags
);
3083 if (atomic_read(&mdev
->ap_bio_cnt
) == 0) {
3084 if (!test_and_set_bit(BITMAP_IO_QUEUED
, &mdev
->flags
))
3085 drbd_queue_work(&mdev
->tconn
->data
.work
, &mdev
->bm_io_work
.w
);
3087 spin_unlock_irq(&mdev
->tconn
->req_lock
);
3091 * drbd_bitmap_io() - Does an IO operation on the whole bitmap
3092 * @mdev: DRBD device.
3093 * @io_fn: IO callback to be called when bitmap IO is possible
3094 * @why: Descriptive text of the reason for doing the IO
3096 * freezes application IO while that the actual IO operations runs. This
3097 * functions MAY NOT be called from worker context.
3099 int drbd_bitmap_io(struct drbd_conf
*mdev
, int (*io_fn
)(struct drbd_conf
*),
3100 char *why
, enum bm_flag flags
)
3104 D_ASSERT(current
!= mdev
->tconn
->worker
.task
);
3106 if ((flags
& BM_LOCKED_SET_ALLOWED
) == 0)
3107 drbd_suspend_io(mdev
);
3109 drbd_bm_lock(mdev
, why
, flags
);
3111 drbd_bm_unlock(mdev
);
3113 if ((flags
& BM_LOCKED_SET_ALLOWED
) == 0)
3114 drbd_resume_io(mdev
);
3119 void drbd_md_set_flag(struct drbd_conf
*mdev
, int flag
) __must_hold(local
)
3121 if ((mdev
->ldev
->md
.flags
& flag
) != flag
) {
3122 drbd_md_mark_dirty(mdev
);
3123 mdev
->ldev
->md
.flags
|= flag
;
3127 void drbd_md_clear_flag(struct drbd_conf
*mdev
, int flag
) __must_hold(local
)
3129 if ((mdev
->ldev
->md
.flags
& flag
) != 0) {
3130 drbd_md_mark_dirty(mdev
);
3131 mdev
->ldev
->md
.flags
&= ~flag
;
3134 int drbd_md_test_flag(struct drbd_backing_dev
*bdev
, int flag
)
3136 return (bdev
->md
.flags
& flag
) != 0;
3139 static void md_sync_timer_fn(unsigned long data
)
3141 struct drbd_conf
*mdev
= (struct drbd_conf
*) data
;
3143 drbd_queue_work_front(&mdev
->tconn
->data
.work
, &mdev
->md_sync_work
);
3146 static int w_md_sync(struct drbd_work
*w
, int unused
)
3148 struct drbd_conf
*mdev
= w
->mdev
;
3150 dev_warn(DEV
, "md_sync_timer expired! Worker calls drbd_md_sync().\n");
3152 dev_warn(DEV
, "last md_mark_dirty: %s:%u\n",
3153 mdev
->last_md_mark_dirty
.func
, mdev
->last_md_mark_dirty
.line
);
3159 const char *cmdname(enum drbd_packet cmd
)
3161 /* THINK may need to become several global tables
3162 * when we want to support more than
3163 * one PRO_VERSION */
3164 static const char *cmdnames
[] = {
3166 [P_DATA_REPLY
] = "DataReply",
3167 [P_RS_DATA_REPLY
] = "RSDataReply",
3168 [P_BARRIER
] = "Barrier",
3169 [P_BITMAP
] = "ReportBitMap",
3170 [P_BECOME_SYNC_TARGET
] = "BecomeSyncTarget",
3171 [P_BECOME_SYNC_SOURCE
] = "BecomeSyncSource",
3172 [P_UNPLUG_REMOTE
] = "UnplugRemote",
3173 [P_DATA_REQUEST
] = "DataRequest",
3174 [P_RS_DATA_REQUEST
] = "RSDataRequest",
3175 [P_SYNC_PARAM
] = "SyncParam",
3176 [P_SYNC_PARAM89
] = "SyncParam89",
3177 [P_PROTOCOL
] = "ReportProtocol",
3178 [P_UUIDS
] = "ReportUUIDs",
3179 [P_SIZES
] = "ReportSizes",
3180 [P_STATE
] = "ReportState",
3181 [P_SYNC_UUID
] = "ReportSyncUUID",
3182 [P_AUTH_CHALLENGE
] = "AuthChallenge",
3183 [P_AUTH_RESPONSE
] = "AuthResponse",
3185 [P_PING_ACK
] = "PingAck",
3186 [P_RECV_ACK
] = "RecvAck",
3187 [P_WRITE_ACK
] = "WriteAck",
3188 [P_RS_WRITE_ACK
] = "RSWriteAck",
3189 [P_DISCARD_WRITE
] = "DiscardWrite",
3190 [P_NEG_ACK
] = "NegAck",
3191 [P_NEG_DREPLY
] = "NegDReply",
3192 [P_NEG_RS_DREPLY
] = "NegRSDReply",
3193 [P_BARRIER_ACK
] = "BarrierAck",
3194 [P_STATE_CHG_REQ
] = "StateChgRequest",
3195 [P_STATE_CHG_REPLY
] = "StateChgReply",
3196 [P_OV_REQUEST
] = "OVRequest",
3197 [P_OV_REPLY
] = "OVReply",
3198 [P_OV_RESULT
] = "OVResult",
3199 [P_CSUM_RS_REQUEST
] = "CsumRSRequest",
3200 [P_RS_IS_IN_SYNC
] = "CsumRSIsInSync",
3201 [P_COMPRESSED_BITMAP
] = "CBitmap",
3202 [P_DELAY_PROBE
] = "DelayProbe",
3203 [P_OUT_OF_SYNC
] = "OutOfSync",
3204 [P_RETRY_WRITE
] = "RetryWrite",
3207 if (cmd
== P_INITIAL_META
)
3208 return "InitialMeta";
3209 if (cmd
== P_INITIAL_DATA
)
3210 return "InitialData";
3211 if (cmd
== P_CONNECTION_FEATURES
)
3212 return "ConnectionFeatures";
3213 if (cmd
>= ARRAY_SIZE(cmdnames
))
3215 return cmdnames
[cmd
];
3219 * drbd_wait_misc - wait for a request to make progress
3220 * @mdev: device associated with the request
3221 * @i: the struct drbd_interval embedded in struct drbd_request or
3222 * struct drbd_peer_request
3224 int drbd_wait_misc(struct drbd_conf
*mdev
, struct drbd_interval
*i
)
3226 struct net_conf
*net_conf
= mdev
->tconn
->net_conf
;
3232 timeout
= MAX_SCHEDULE_TIMEOUT
;
3233 if (net_conf
->ko_count
)
3234 timeout
= net_conf
->timeout
* HZ
/ 10 * net_conf
->ko_count
;
3236 /* Indicate to wake up mdev->misc_wait on progress. */
3238 prepare_to_wait(&mdev
->misc_wait
, &wait
, TASK_INTERRUPTIBLE
);
3239 spin_unlock_irq(&mdev
->tconn
->req_lock
);
3240 timeout
= schedule_timeout(timeout
);
3241 finish_wait(&mdev
->misc_wait
, &wait
);
3242 spin_lock_irq(&mdev
->tconn
->req_lock
);
3243 if (!timeout
|| mdev
->state
.conn
< C_CONNECTED
)
3245 if (signal_pending(current
))
3246 return -ERESTARTSYS
;
3250 #ifdef CONFIG_DRBD_FAULT_INJECTION
3251 /* Fault insertion support including random number generator shamelessly
3252 * stolen from kernel/rcutorture.c */
3253 struct fault_random_state
{
3254 unsigned long state
;
3255 unsigned long count
;
3258 #define FAULT_RANDOM_MULT 39916801 /* prime */
3259 #define FAULT_RANDOM_ADD 479001701 /* prime */
3260 #define FAULT_RANDOM_REFRESH 10000
3263 * Crude but fast random-number generator. Uses a linear congruential
3264 * generator, with occasional help from get_random_bytes().
3266 static unsigned long
3267 _drbd_fault_random(struct fault_random_state
*rsp
)
3271 if (!rsp
->count
--) {
3272 get_random_bytes(&refresh
, sizeof(refresh
));
3273 rsp
->state
+= refresh
;
3274 rsp
->count
= FAULT_RANDOM_REFRESH
;
3276 rsp
->state
= rsp
->state
* FAULT_RANDOM_MULT
+ FAULT_RANDOM_ADD
;
3277 return swahw32(rsp
->state
);
3281 _drbd_fault_str(unsigned int type
) {
3282 static char *_faults
[] = {
3283 [DRBD_FAULT_MD_WR
] = "Meta-data write",
3284 [DRBD_FAULT_MD_RD
] = "Meta-data read",
3285 [DRBD_FAULT_RS_WR
] = "Resync write",
3286 [DRBD_FAULT_RS_RD
] = "Resync read",
3287 [DRBD_FAULT_DT_WR
] = "Data write",
3288 [DRBD_FAULT_DT_RD
] = "Data read",
3289 [DRBD_FAULT_DT_RA
] = "Data read ahead",
3290 [DRBD_FAULT_BM_ALLOC
] = "BM allocation",
3291 [DRBD_FAULT_AL_EE
] = "EE allocation",
3292 [DRBD_FAULT_RECEIVE
] = "receive data corruption",
3295 return (type
< DRBD_FAULT_MAX
) ? _faults
[type
] : "**Unknown**";
3299 _drbd_insert_fault(struct drbd_conf
*mdev
, unsigned int type
)
3301 static struct fault_random_state rrs
= {0, 0};
3303 unsigned int ret
= (
3305 ((1 << mdev_to_minor(mdev
)) & fault_devs
) != 0) &&
3306 (((_drbd_fault_random(&rrs
) % 100) + 1) <= fault_rate
));
3311 if (__ratelimit(&drbd_ratelimit_state
))
3312 dev_warn(DEV
, "***Simulating %s failure\n",
3313 _drbd_fault_str(type
));
3320 const char *drbd_buildtag(void)
3322 /* DRBD built from external sources has here a reference to the
3323 git hash of the source code. */
3325 static char buildtag
[38] = "\0uilt-in";
3327 if (buildtag
[0] == 0) {
3328 #ifdef CONFIG_MODULES
3329 if (THIS_MODULE
!= NULL
)
3330 sprintf(buildtag
, "srcversion: %-24s", THIS_MODULE
->srcversion
);
3339 module_init(drbd_init
)
3340 module_exit(drbd_cleanup
)
3342 EXPORT_SYMBOL(drbd_conn_str
);
3343 EXPORT_SYMBOL(drbd_role_str
);
3344 EXPORT_SYMBOL(drbd_disk_str
);
3345 EXPORT_SYMBOL(drbd_set_st_err_str
);