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>
48 #include <linux/workqueue.h>
49 #define __KERNEL_SYSCALLS__
50 #include <linux/unistd.h>
51 #include <linux/vmalloc.h>
53 #include <linux/drbd_limits.h>
55 #include "drbd_protocol.h"
56 #include "drbd_req.h" /* only for _req_mod in tl_release and tl_clear */
60 static DEFINE_MUTEX(drbd_main_mutex
);
61 int drbd_receiver(struct drbd_thread
*);
62 int drbd_worker(struct drbd_thread
*);
65 static int drbd_open(struct block_device
*bdev
, fmode_t mode
);
66 static void 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 bool 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;"
121 struct idr drbd_devices
;
122 struct list_head drbd_resources
;
124 struct kmem_cache
*drbd_request_cache
;
125 struct kmem_cache
*drbd_ee_cache
; /* peer requests */
126 struct kmem_cache
*drbd_bm_ext_cache
; /* bitmap extents */
127 struct kmem_cache
*drbd_al_ext_cache
; /* activity log extents */
128 mempool_t
*drbd_request_mempool
;
129 mempool_t
*drbd_ee_mempool
;
130 mempool_t
*drbd_md_io_page_pool
;
131 struct bio_set
*drbd_md_io_bio_set
;
133 /* I do not use a standard mempool, because:
134 1) I want to hand out the pre-allocated objects first.
135 2) I want to be able to interrupt sleeping allocation with a signal.
136 Note: This is a single linked list, the next pointer is the private
137 member of struct page.
139 struct page
*drbd_pp_pool
;
140 spinlock_t drbd_pp_lock
;
142 wait_queue_head_t drbd_pp_wait
;
144 DEFINE_RATELIMIT_STATE(drbd_ratelimit_state
, 5 * HZ
, 5);
146 static const struct block_device_operations drbd_ops
= {
147 .owner
= THIS_MODULE
,
149 .release
= drbd_release
,
152 struct bio
*bio_alloc_drbd(gfp_t gfp_mask
)
156 if (!drbd_md_io_bio_set
)
157 return bio_alloc(gfp_mask
, 1);
159 bio
= bio_alloc_bioset(gfp_mask
, 1, drbd_md_io_bio_set
);
166 /* When checking with sparse, and this is an inline function, sparse will
167 give tons of false positives. When this is a real functions sparse works.
169 int _get_ldev_if_state(struct drbd_device
*device
, enum drbd_disk_state mins
)
173 atomic_inc(&device
->local_cnt
);
174 io_allowed
= (device
->state
.disk
>= mins
);
176 if (atomic_dec_and_test(&device
->local_cnt
))
177 wake_up(&device
->misc_wait
);
185 * tl_release() - mark as BARRIER_ACKED all requests in the corresponding transfer log epoch
186 * @connection: DRBD connection.
187 * @barrier_nr: Expected identifier of the DRBD write barrier packet.
188 * @set_size: Expected number of requests before that barrier.
190 * In case the passed barrier_nr or set_size does not match the oldest
191 * epoch of not yet barrier-acked requests, this function will cause a
192 * termination of the connection.
194 void tl_release(struct drbd_connection
*connection
, unsigned int barrier_nr
,
195 unsigned int set_size
)
197 struct drbd_request
*r
;
198 struct drbd_request
*req
= NULL
;
199 int expect_epoch
= 0;
202 spin_lock_irq(&connection
->resource
->req_lock
);
204 /* find oldest not yet barrier-acked write request,
205 * count writes in its epoch. */
206 list_for_each_entry(r
, &connection
->transfer_log
, tl_requests
) {
207 const unsigned s
= r
->rq_state
;
211 if (!(s
& RQ_NET_MASK
))
216 expect_epoch
= req
->epoch
;
219 if (r
->epoch
!= expect_epoch
)
223 /* if (s & RQ_DONE): not expected */
224 /* if (!(s & RQ_NET_MASK)): not expected */
229 /* first some paranoia code */
231 drbd_err(connection
, "BAD! BarrierAck #%u received, but no epoch in tl!?\n",
235 if (expect_epoch
!= barrier_nr
) {
236 drbd_err(connection
, "BAD! BarrierAck #%u received, expected #%u!\n",
237 barrier_nr
, expect_epoch
);
241 if (expect_size
!= set_size
) {
242 drbd_err(connection
, "BAD! BarrierAck #%u received with n_writes=%u, expected n_writes=%u!\n",
243 barrier_nr
, set_size
, expect_size
);
247 /* Clean up list of requests processed during current epoch. */
248 /* this extra list walk restart is paranoia,
249 * to catch requests being barrier-acked "unexpectedly".
250 * It usually should find the same req again, or some READ preceding it. */
251 list_for_each_entry(req
, &connection
->transfer_log
, tl_requests
)
252 if (req
->epoch
== expect_epoch
)
254 list_for_each_entry_safe_from(req
, r
, &connection
->transfer_log
, tl_requests
) {
255 if (req
->epoch
!= expect_epoch
)
257 _req_mod(req
, BARRIER_ACKED
);
259 spin_unlock_irq(&connection
->resource
->req_lock
);
264 spin_unlock_irq(&connection
->resource
->req_lock
);
265 conn_request_state(connection
, NS(conn
, C_PROTOCOL_ERROR
), CS_HARD
);
270 * _tl_restart() - Walks the transfer log, and applies an action to all requests
271 * @device: DRBD device.
272 * @what: The action/event to perform with all request objects
274 * @what might be one of CONNECTION_LOST_WHILE_PENDING, RESEND, FAIL_FROZEN_DISK_IO,
275 * RESTART_FROZEN_DISK_IO.
277 /* must hold resource->req_lock */
278 void _tl_restart(struct drbd_connection
*connection
, enum drbd_req_event what
)
280 struct drbd_request
*req
, *r
;
282 list_for_each_entry_safe(req
, r
, &connection
->transfer_log
, tl_requests
)
286 void tl_restart(struct drbd_connection
*connection
, enum drbd_req_event what
)
288 spin_lock_irq(&connection
->resource
->req_lock
);
289 _tl_restart(connection
, what
);
290 spin_unlock_irq(&connection
->resource
->req_lock
);
294 * tl_clear() - Clears all requests and &struct drbd_tl_epoch objects out of the TL
295 * @device: DRBD device.
297 * This is called after the connection to the peer was lost. The storage covered
298 * by the requests on the transfer gets marked as our of sync. Called from the
299 * receiver thread and the worker thread.
301 void tl_clear(struct drbd_connection
*connection
)
303 tl_restart(connection
, CONNECTION_LOST_WHILE_PENDING
);
307 * tl_abort_disk_io() - Abort disk I/O for all requests for a certain device in the TL
308 * @device: DRBD device.
310 void tl_abort_disk_io(struct drbd_device
*device
)
312 struct drbd_connection
*connection
= first_peer_device(device
)->connection
;
313 struct drbd_request
*req
, *r
;
315 spin_lock_irq(&connection
->resource
->req_lock
);
316 list_for_each_entry_safe(req
, r
, &connection
->transfer_log
, tl_requests
) {
317 if (!(req
->rq_state
& RQ_LOCAL_PENDING
))
319 if (req
->w
.device
!= device
)
321 _req_mod(req
, ABORT_DISK_IO
);
323 spin_unlock_irq(&connection
->resource
->req_lock
);
326 static int drbd_thread_setup(void *arg
)
328 struct drbd_thread
*thi
= (struct drbd_thread
*) arg
;
329 struct drbd_connection
*connection
= thi
->connection
;
333 snprintf(current
->comm
, sizeof(current
->comm
), "drbd_%c_%s",
335 thi
->connection
->resource
->name
);
338 retval
= thi
->function(thi
);
340 spin_lock_irqsave(&thi
->t_lock
, flags
);
342 /* if the receiver has been "EXITING", the last thing it did
343 * was set the conn state to "StandAlone",
344 * if now a re-connect request comes in, conn state goes C_UNCONNECTED,
345 * and receiver thread will be "started".
346 * drbd_thread_start needs to set "RESTARTING" in that case.
347 * t_state check and assignment needs to be within the same spinlock,
348 * so either thread_start sees EXITING, and can remap to RESTARTING,
349 * or thread_start see NONE, and can proceed as normal.
352 if (thi
->t_state
== RESTARTING
) {
353 drbd_info(connection
, "Restarting %s thread\n", thi
->name
);
354 thi
->t_state
= RUNNING
;
355 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
362 complete_all(&thi
->stop
);
363 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
365 drbd_info(connection
, "Terminating %s\n", current
->comm
);
367 /* Release mod reference taken when thread was started */
369 kref_put(&connection
->kref
, drbd_destroy_connection
);
370 module_put(THIS_MODULE
);
374 static void drbd_thread_init(struct drbd_connection
*connection
, struct drbd_thread
*thi
,
375 int (*func
) (struct drbd_thread
*), char *name
)
377 spin_lock_init(&thi
->t_lock
);
380 thi
->function
= func
;
381 thi
->connection
= connection
;
382 strncpy(thi
->name
, name
, ARRAY_SIZE(thi
->name
));
385 int drbd_thread_start(struct drbd_thread
*thi
)
387 struct drbd_connection
*connection
= thi
->connection
;
388 struct task_struct
*nt
;
391 /* is used from state engine doing drbd_thread_stop_nowait,
392 * while holding the req lock irqsave */
393 spin_lock_irqsave(&thi
->t_lock
, flags
);
395 switch (thi
->t_state
) {
397 drbd_info(connection
, "Starting %s thread (from %s [%d])\n",
398 thi
->name
, current
->comm
, current
->pid
);
400 /* Get ref on module for thread - this is released when thread exits */
401 if (!try_module_get(THIS_MODULE
)) {
402 drbd_err(connection
, "Failed to get module reference in drbd_thread_start\n");
403 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
407 kref_get(&thi
->connection
->kref
);
409 init_completion(&thi
->stop
);
410 thi
->reset_cpu_mask
= 1;
411 thi
->t_state
= RUNNING
;
412 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
413 flush_signals(current
); /* otherw. may get -ERESTARTNOINTR */
415 nt
= kthread_create(drbd_thread_setup
, (void *) thi
,
416 "drbd_%c_%s", thi
->name
[0], thi
->connection
->resource
->name
);
419 drbd_err(connection
, "Couldn't start thread\n");
421 kref_put(&connection
->kref
, drbd_destroy_connection
);
422 module_put(THIS_MODULE
);
425 spin_lock_irqsave(&thi
->t_lock
, flags
);
427 thi
->t_state
= RUNNING
;
428 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
432 thi
->t_state
= RESTARTING
;
433 drbd_info(connection
, "Restarting %s thread (from %s [%d])\n",
434 thi
->name
, current
->comm
, current
->pid
);
439 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
447 void _drbd_thread_stop(struct drbd_thread
*thi
, int restart
, int wait
)
451 enum drbd_thread_state ns
= restart
? RESTARTING
: EXITING
;
453 /* may be called from state engine, holding the req lock irqsave */
454 spin_lock_irqsave(&thi
->t_lock
, flags
);
456 if (thi
->t_state
== NONE
) {
457 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
459 drbd_thread_start(thi
);
463 if (thi
->t_state
!= ns
) {
464 if (thi
->task
== NULL
) {
465 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
471 init_completion(&thi
->stop
);
472 if (thi
->task
!= current
)
473 force_sig(DRBD_SIGKILL
, thi
->task
);
476 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
479 wait_for_completion(&thi
->stop
);
482 static struct drbd_thread
*drbd_task_to_thread(struct drbd_connection
*connection
, struct task_struct
*task
)
484 struct drbd_thread
*thi
=
485 task
== connection
->receiver
.task
? &connection
->receiver
:
486 task
== connection
->asender
.task
? &connection
->asender
:
487 task
== connection
->worker
.task
? &connection
->worker
: NULL
;
492 char *drbd_task_to_thread_name(struct drbd_connection
*connection
, struct task_struct
*task
)
494 struct drbd_thread
*thi
= drbd_task_to_thread(connection
, task
);
495 return thi
? thi
->name
: task
->comm
;
498 int conn_lowest_minor(struct drbd_connection
*connection
)
500 struct drbd_peer_device
*peer_device
;
501 int vnr
= 0, minor
= -1;
504 peer_device
= idr_get_next(&connection
->peer_devices
, &vnr
);
506 minor
= device_to_minor(peer_device
->device
);
514 * drbd_calc_cpu_mask() - Generate CPU masks, spread over all CPUs
516 * Forces all threads of a resource onto the same CPU. This is beneficial for
517 * DRBD's performance. May be overwritten by user's configuration.
519 static void drbd_calc_cpu_mask(cpumask_var_t
*cpu_mask
)
521 unsigned int *resources_per_cpu
, min_index
= ~0;
523 resources_per_cpu
= kzalloc(nr_cpu_ids
* sizeof(*resources_per_cpu
), GFP_KERNEL
);
524 if (resources_per_cpu
) {
525 struct drbd_resource
*resource
;
526 unsigned int cpu
, min
= ~0;
529 for_each_resource_rcu(resource
, &drbd_resources
) {
530 for_each_cpu(cpu
, resource
->cpu_mask
)
531 resources_per_cpu
[cpu
]++;
534 for_each_online_cpu(cpu
) {
535 if (resources_per_cpu
[cpu
] < min
) {
536 min
= resources_per_cpu
[cpu
];
540 kfree(resources_per_cpu
);
542 if (min_index
== ~0) {
543 cpumask_setall(*cpu_mask
);
546 cpumask_set_cpu(min_index
, *cpu_mask
);
550 * drbd_thread_current_set_cpu() - modifies the cpu mask of the _current_ thread
551 * @device: DRBD device.
552 * @thi: drbd_thread object
554 * call in the "main loop" of _all_ threads, no need for any mutex, current won't die
557 void drbd_thread_current_set_cpu(struct drbd_thread
*thi
)
559 struct task_struct
*p
= current
;
561 if (!thi
->reset_cpu_mask
)
563 thi
->reset_cpu_mask
= 0;
564 set_cpus_allowed_ptr(p
, thi
->connection
->resource
->cpu_mask
);
567 #define drbd_calc_cpu_mask(A) ({})
571 * drbd_header_size - size of a packet header
573 * The header size is a multiple of 8, so any payload following the header is
574 * word aligned on 64-bit architectures. (The bitmap send and receive code
577 unsigned int drbd_header_size(struct drbd_connection
*connection
)
579 if (connection
->agreed_pro_version
>= 100) {
580 BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header100
), 8));
581 return sizeof(struct p_header100
);
583 BUILD_BUG_ON(sizeof(struct p_header80
) !=
584 sizeof(struct p_header95
));
585 BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header80
), 8));
586 return sizeof(struct p_header80
);
590 static unsigned int prepare_header80(struct p_header80
*h
, enum drbd_packet cmd
, int size
)
592 h
->magic
= cpu_to_be32(DRBD_MAGIC
);
593 h
->command
= cpu_to_be16(cmd
);
594 h
->length
= cpu_to_be16(size
);
595 return sizeof(struct p_header80
);
598 static unsigned int prepare_header95(struct p_header95
*h
, enum drbd_packet cmd
, int size
)
600 h
->magic
= cpu_to_be16(DRBD_MAGIC_BIG
);
601 h
->command
= cpu_to_be16(cmd
);
602 h
->length
= cpu_to_be32(size
);
603 return sizeof(struct p_header95
);
606 static unsigned int prepare_header100(struct p_header100
*h
, enum drbd_packet cmd
,
609 h
->magic
= cpu_to_be32(DRBD_MAGIC_100
);
610 h
->volume
= cpu_to_be16(vnr
);
611 h
->command
= cpu_to_be16(cmd
);
612 h
->length
= cpu_to_be32(size
);
614 return sizeof(struct p_header100
);
617 static unsigned int prepare_header(struct drbd_connection
*connection
, int vnr
,
618 void *buffer
, enum drbd_packet cmd
, int size
)
620 if (connection
->agreed_pro_version
>= 100)
621 return prepare_header100(buffer
, cmd
, size
, vnr
);
622 else if (connection
->agreed_pro_version
>= 95 &&
623 size
> DRBD_MAX_SIZE_H80_PACKET
)
624 return prepare_header95(buffer
, cmd
, size
);
626 return prepare_header80(buffer
, cmd
, size
);
629 static void *__conn_prepare_command(struct drbd_connection
*connection
,
630 struct drbd_socket
*sock
)
634 return sock
->sbuf
+ drbd_header_size(connection
);
637 void *conn_prepare_command(struct drbd_connection
*connection
, struct drbd_socket
*sock
)
641 mutex_lock(&sock
->mutex
);
642 p
= __conn_prepare_command(connection
, sock
);
644 mutex_unlock(&sock
->mutex
);
649 void *drbd_prepare_command(struct drbd_device
*device
, struct drbd_socket
*sock
)
651 return conn_prepare_command(first_peer_device(device
)->connection
, sock
);
654 static int __send_command(struct drbd_connection
*connection
, int vnr
,
655 struct drbd_socket
*sock
, enum drbd_packet cmd
,
656 unsigned int header_size
, void *data
,
663 * Called with @data == NULL and the size of the data blocks in @size
664 * for commands that send data blocks. For those commands, omit the
665 * MSG_MORE flag: this will increase the likelihood that data blocks
666 * which are page aligned on the sender will end up page aligned on the
669 msg_flags
= data
? MSG_MORE
: 0;
671 header_size
+= prepare_header(connection
, vnr
, sock
->sbuf
, cmd
,
673 err
= drbd_send_all(connection
, sock
->socket
, sock
->sbuf
, header_size
,
676 err
= drbd_send_all(connection
, sock
->socket
, data
, size
, 0);
680 static int __conn_send_command(struct drbd_connection
*connection
, struct drbd_socket
*sock
,
681 enum drbd_packet cmd
, unsigned int header_size
,
682 void *data
, unsigned int size
)
684 return __send_command(connection
, 0, sock
, cmd
, header_size
, data
, size
);
687 int conn_send_command(struct drbd_connection
*connection
, struct drbd_socket
*sock
,
688 enum drbd_packet cmd
, unsigned int header_size
,
689 void *data
, unsigned int size
)
693 err
= __conn_send_command(connection
, sock
, cmd
, header_size
, data
, size
);
694 mutex_unlock(&sock
->mutex
);
698 int drbd_send_command(struct drbd_device
*device
, struct drbd_socket
*sock
,
699 enum drbd_packet cmd
, unsigned int header_size
,
700 void *data
, unsigned int size
)
704 err
= __send_command(first_peer_device(device
)->connection
, device
->vnr
, sock
, cmd
, header_size
,
706 mutex_unlock(&sock
->mutex
);
710 int drbd_send_ping(struct drbd_connection
*connection
)
712 struct drbd_socket
*sock
;
714 sock
= &connection
->meta
;
715 if (!conn_prepare_command(connection
, sock
))
717 return conn_send_command(connection
, sock
, P_PING
, 0, NULL
, 0);
720 int drbd_send_ping_ack(struct drbd_connection
*connection
)
722 struct drbd_socket
*sock
;
724 sock
= &connection
->meta
;
725 if (!conn_prepare_command(connection
, sock
))
727 return conn_send_command(connection
, sock
, P_PING_ACK
, 0, NULL
, 0);
730 int drbd_send_sync_param(struct drbd_device
*device
)
732 struct drbd_socket
*sock
;
733 struct p_rs_param_95
*p
;
735 const int apv
= first_peer_device(device
)->connection
->agreed_pro_version
;
736 enum drbd_packet cmd
;
738 struct disk_conf
*dc
;
740 sock
= &first_peer_device(device
)->connection
->data
;
741 p
= drbd_prepare_command(device
, sock
);
746 nc
= rcu_dereference(first_peer_device(device
)->connection
->net_conf
);
748 size
= apv
<= 87 ? sizeof(struct p_rs_param
)
749 : apv
== 88 ? sizeof(struct p_rs_param
)
750 + strlen(nc
->verify_alg
) + 1
751 : apv
<= 94 ? sizeof(struct p_rs_param_89
)
752 : /* apv >= 95 */ sizeof(struct p_rs_param_95
);
754 cmd
= apv
>= 89 ? P_SYNC_PARAM89
: P_SYNC_PARAM
;
756 /* initialize verify_alg and csums_alg */
757 memset(p
->verify_alg
, 0, 2 * SHARED_SECRET_MAX
);
759 if (get_ldev(device
)) {
760 dc
= rcu_dereference(device
->ldev
->disk_conf
);
761 p
->resync_rate
= cpu_to_be32(dc
->resync_rate
);
762 p
->c_plan_ahead
= cpu_to_be32(dc
->c_plan_ahead
);
763 p
->c_delay_target
= cpu_to_be32(dc
->c_delay_target
);
764 p
->c_fill_target
= cpu_to_be32(dc
->c_fill_target
);
765 p
->c_max_rate
= cpu_to_be32(dc
->c_max_rate
);
768 p
->resync_rate
= cpu_to_be32(DRBD_RESYNC_RATE_DEF
);
769 p
->c_plan_ahead
= cpu_to_be32(DRBD_C_PLAN_AHEAD_DEF
);
770 p
->c_delay_target
= cpu_to_be32(DRBD_C_DELAY_TARGET_DEF
);
771 p
->c_fill_target
= cpu_to_be32(DRBD_C_FILL_TARGET_DEF
);
772 p
->c_max_rate
= cpu_to_be32(DRBD_C_MAX_RATE_DEF
);
776 strcpy(p
->verify_alg
, nc
->verify_alg
);
778 strcpy(p
->csums_alg
, nc
->csums_alg
);
781 return drbd_send_command(device
, sock
, cmd
, size
, NULL
, 0);
784 int __drbd_send_protocol(struct drbd_connection
*connection
, enum drbd_packet cmd
)
786 struct drbd_socket
*sock
;
787 struct p_protocol
*p
;
791 sock
= &connection
->data
;
792 p
= __conn_prepare_command(connection
, sock
);
797 nc
= rcu_dereference(connection
->net_conf
);
799 if (nc
->tentative
&& connection
->agreed_pro_version
< 92) {
801 mutex_unlock(&sock
->mutex
);
802 drbd_err(connection
, "--dry-run is not supported by peer");
807 if (connection
->agreed_pro_version
>= 87)
808 size
+= strlen(nc
->integrity_alg
) + 1;
810 p
->protocol
= cpu_to_be32(nc
->wire_protocol
);
811 p
->after_sb_0p
= cpu_to_be32(nc
->after_sb_0p
);
812 p
->after_sb_1p
= cpu_to_be32(nc
->after_sb_1p
);
813 p
->after_sb_2p
= cpu_to_be32(nc
->after_sb_2p
);
814 p
->two_primaries
= cpu_to_be32(nc
->two_primaries
);
816 if (nc
->discard_my_data
)
817 cf
|= CF_DISCARD_MY_DATA
;
820 p
->conn_flags
= cpu_to_be32(cf
);
822 if (connection
->agreed_pro_version
>= 87)
823 strcpy(p
->integrity_alg
, nc
->integrity_alg
);
826 return __conn_send_command(connection
, sock
, cmd
, size
, NULL
, 0);
829 int drbd_send_protocol(struct drbd_connection
*connection
)
833 mutex_lock(&connection
->data
.mutex
);
834 err
= __drbd_send_protocol(connection
, P_PROTOCOL
);
835 mutex_unlock(&connection
->data
.mutex
);
840 static int _drbd_send_uuids(struct drbd_device
*device
, u64 uuid_flags
)
842 struct drbd_socket
*sock
;
846 if (!get_ldev_if_state(device
, D_NEGOTIATING
))
849 sock
= &first_peer_device(device
)->connection
->data
;
850 p
= drbd_prepare_command(device
, sock
);
855 spin_lock_irq(&device
->ldev
->md
.uuid_lock
);
856 for (i
= UI_CURRENT
; i
< UI_SIZE
; i
++)
857 p
->uuid
[i
] = cpu_to_be64(device
->ldev
->md
.uuid
[i
]);
858 spin_unlock_irq(&device
->ldev
->md
.uuid_lock
);
860 device
->comm_bm_set
= drbd_bm_total_weight(device
);
861 p
->uuid
[UI_SIZE
] = cpu_to_be64(device
->comm_bm_set
);
863 uuid_flags
|= rcu_dereference(first_peer_device(device
)->connection
->net_conf
)->discard_my_data
? 1 : 0;
865 uuid_flags
|= test_bit(CRASHED_PRIMARY
, &device
->flags
) ? 2 : 0;
866 uuid_flags
|= device
->new_state_tmp
.disk
== D_INCONSISTENT
? 4 : 0;
867 p
->uuid
[UI_FLAGS
] = cpu_to_be64(uuid_flags
);
870 return drbd_send_command(device
, sock
, P_UUIDS
, sizeof(*p
), NULL
, 0);
873 int drbd_send_uuids(struct drbd_device
*device
)
875 return _drbd_send_uuids(device
, 0);
878 int drbd_send_uuids_skip_initial_sync(struct drbd_device
*device
)
880 return _drbd_send_uuids(device
, 8);
883 void drbd_print_uuids(struct drbd_device
*device
, const char *text
)
885 if (get_ldev_if_state(device
, D_NEGOTIATING
)) {
886 u64
*uuid
= device
->ldev
->md
.uuid
;
887 drbd_info(device
, "%s %016llX:%016llX:%016llX:%016llX\n",
889 (unsigned long long)uuid
[UI_CURRENT
],
890 (unsigned long long)uuid
[UI_BITMAP
],
891 (unsigned long long)uuid
[UI_HISTORY_START
],
892 (unsigned long long)uuid
[UI_HISTORY_END
]);
895 drbd_info(device
, "%s effective data uuid: %016llX\n",
897 (unsigned long long)device
->ed_uuid
);
901 void drbd_gen_and_send_sync_uuid(struct drbd_device
*device
)
903 struct drbd_socket
*sock
;
907 D_ASSERT(device
, device
->state
.disk
== D_UP_TO_DATE
);
909 uuid
= device
->ldev
->md
.uuid
[UI_BITMAP
];
910 if (uuid
&& uuid
!= UUID_JUST_CREATED
)
911 uuid
= uuid
+ UUID_NEW_BM_OFFSET
;
913 get_random_bytes(&uuid
, sizeof(u64
));
914 drbd_uuid_set(device
, UI_BITMAP
, uuid
);
915 drbd_print_uuids(device
, "updated sync UUID");
916 drbd_md_sync(device
);
918 sock
= &first_peer_device(device
)->connection
->data
;
919 p
= drbd_prepare_command(device
, sock
);
921 p
->uuid
= cpu_to_be64(uuid
);
922 drbd_send_command(device
, sock
, P_SYNC_UUID
, sizeof(*p
), NULL
, 0);
926 int drbd_send_sizes(struct drbd_device
*device
, int trigger_reply
, enum dds_flags flags
)
928 struct drbd_socket
*sock
;
930 sector_t d_size
, u_size
;
932 unsigned int max_bio_size
;
934 if (get_ldev_if_state(device
, D_NEGOTIATING
)) {
935 D_ASSERT(device
, device
->ldev
->backing_bdev
);
936 d_size
= drbd_get_max_capacity(device
->ldev
);
938 u_size
= rcu_dereference(device
->ldev
->disk_conf
)->disk_size
;
940 q_order_type
= drbd_queue_order_type(device
);
941 max_bio_size
= queue_max_hw_sectors(device
->ldev
->backing_bdev
->bd_disk
->queue
) << 9;
942 max_bio_size
= min(max_bio_size
, DRBD_MAX_BIO_SIZE
);
947 q_order_type
= QUEUE_ORDERED_NONE
;
948 max_bio_size
= DRBD_MAX_BIO_SIZE
; /* ... multiple BIOs per peer_request */
951 sock
= &first_peer_device(device
)->connection
->data
;
952 p
= drbd_prepare_command(device
, sock
);
956 if (first_peer_device(device
)->connection
->agreed_pro_version
<= 94)
957 max_bio_size
= min(max_bio_size
, DRBD_MAX_SIZE_H80_PACKET
);
958 else if (first_peer_device(device
)->connection
->agreed_pro_version
< 100)
959 max_bio_size
= min(max_bio_size
, DRBD_MAX_BIO_SIZE_P95
);
961 p
->d_size
= cpu_to_be64(d_size
);
962 p
->u_size
= cpu_to_be64(u_size
);
963 p
->c_size
= cpu_to_be64(trigger_reply
? 0 : drbd_get_capacity(device
->this_bdev
));
964 p
->max_bio_size
= cpu_to_be32(max_bio_size
);
965 p
->queue_order_type
= cpu_to_be16(q_order_type
);
966 p
->dds_flags
= cpu_to_be16(flags
);
967 return drbd_send_command(device
, sock
, P_SIZES
, sizeof(*p
), NULL
, 0);
971 * drbd_send_current_state() - Sends the drbd state to the peer
972 * @device: DRBD device.
974 int drbd_send_current_state(struct drbd_device
*device
)
976 struct drbd_socket
*sock
;
979 sock
= &first_peer_device(device
)->connection
->data
;
980 p
= drbd_prepare_command(device
, sock
);
983 p
->state
= cpu_to_be32(device
->state
.i
); /* Within the send mutex */
984 return drbd_send_command(device
, sock
, P_STATE
, sizeof(*p
), NULL
, 0);
988 * drbd_send_state() - After a state change, sends the new state to the peer
989 * @device: DRBD device.
990 * @state: the state to send, not necessarily the current state.
992 * Each state change queues an "after_state_ch" work, which will eventually
993 * send the resulting new state to the peer. If more state changes happen
994 * between queuing and processing of the after_state_ch work, we still
995 * want to send each intermediary state in the order it occurred.
997 int drbd_send_state(struct drbd_device
*device
, union drbd_state state
)
999 struct drbd_socket
*sock
;
1002 sock
= &first_peer_device(device
)->connection
->data
;
1003 p
= drbd_prepare_command(device
, sock
);
1006 p
->state
= cpu_to_be32(state
.i
); /* Within the send mutex */
1007 return drbd_send_command(device
, sock
, P_STATE
, sizeof(*p
), NULL
, 0);
1010 int drbd_send_state_req(struct drbd_device
*device
, union drbd_state mask
, union drbd_state val
)
1012 struct drbd_socket
*sock
;
1013 struct p_req_state
*p
;
1015 sock
= &first_peer_device(device
)->connection
->data
;
1016 p
= drbd_prepare_command(device
, sock
);
1019 p
->mask
= cpu_to_be32(mask
.i
);
1020 p
->val
= cpu_to_be32(val
.i
);
1021 return drbd_send_command(device
, sock
, P_STATE_CHG_REQ
, sizeof(*p
), NULL
, 0);
1024 int conn_send_state_req(struct drbd_connection
*connection
, union drbd_state mask
, union drbd_state val
)
1026 enum drbd_packet cmd
;
1027 struct drbd_socket
*sock
;
1028 struct p_req_state
*p
;
1030 cmd
= connection
->agreed_pro_version
< 100 ? P_STATE_CHG_REQ
: P_CONN_ST_CHG_REQ
;
1031 sock
= &connection
->data
;
1032 p
= conn_prepare_command(connection
, sock
);
1035 p
->mask
= cpu_to_be32(mask
.i
);
1036 p
->val
= cpu_to_be32(val
.i
);
1037 return conn_send_command(connection
, sock
, cmd
, sizeof(*p
), NULL
, 0);
1040 void drbd_send_sr_reply(struct drbd_device
*device
, enum drbd_state_rv retcode
)
1042 struct drbd_socket
*sock
;
1043 struct p_req_state_reply
*p
;
1045 sock
= &first_peer_device(device
)->connection
->meta
;
1046 p
= drbd_prepare_command(device
, sock
);
1048 p
->retcode
= cpu_to_be32(retcode
);
1049 drbd_send_command(device
, sock
, P_STATE_CHG_REPLY
, sizeof(*p
), NULL
, 0);
1053 void conn_send_sr_reply(struct drbd_connection
*connection
, enum drbd_state_rv retcode
)
1055 struct drbd_socket
*sock
;
1056 struct p_req_state_reply
*p
;
1057 enum drbd_packet cmd
= connection
->agreed_pro_version
< 100 ? P_STATE_CHG_REPLY
: P_CONN_ST_CHG_REPLY
;
1059 sock
= &connection
->meta
;
1060 p
= conn_prepare_command(connection
, sock
);
1062 p
->retcode
= cpu_to_be32(retcode
);
1063 conn_send_command(connection
, sock
, cmd
, sizeof(*p
), NULL
, 0);
1067 static void dcbp_set_code(struct p_compressed_bm
*p
, enum drbd_bitmap_code code
)
1069 BUG_ON(code
& ~0xf);
1070 p
->encoding
= (p
->encoding
& ~0xf) | code
;
1073 static void dcbp_set_start(struct p_compressed_bm
*p
, int set
)
1075 p
->encoding
= (p
->encoding
& ~0x80) | (set
? 0x80 : 0);
1078 static void dcbp_set_pad_bits(struct p_compressed_bm
*p
, int n
)
1081 p
->encoding
= (p
->encoding
& (~0x7 << 4)) | (n
<< 4);
1084 static int fill_bitmap_rle_bits(struct drbd_device
*device
,
1085 struct p_compressed_bm
*p
,
1087 struct bm_xfer_ctx
*c
)
1089 struct bitstream bs
;
1090 unsigned long plain_bits
;
1097 /* may we use this feature? */
1099 use_rle
= rcu_dereference(first_peer_device(device
)->connection
->net_conf
)->use_rle
;
1101 if (!use_rle
|| first_peer_device(device
)->connection
->agreed_pro_version
< 90)
1104 if (c
->bit_offset
>= c
->bm_bits
)
1105 return 0; /* nothing to do. */
1107 /* use at most thus many bytes */
1108 bitstream_init(&bs
, p
->code
, size
, 0);
1109 memset(p
->code
, 0, size
);
1110 /* plain bits covered in this code string */
1113 /* p->encoding & 0x80 stores whether the first run length is set.
1114 * bit offset is implicit.
1115 * start with toggle == 2 to be able to tell the first iteration */
1118 /* see how much plain bits we can stuff into one packet
1119 * using RLE and VLI. */
1121 tmp
= (toggle
== 0) ? _drbd_bm_find_next_zero(device
, c
->bit_offset
)
1122 : _drbd_bm_find_next(device
, c
->bit_offset
);
1125 rl
= tmp
- c
->bit_offset
;
1127 if (toggle
== 2) { /* first iteration */
1129 /* the first checked bit was set,
1130 * store start value, */
1131 dcbp_set_start(p
, 1);
1132 /* but skip encoding of zero run length */
1136 dcbp_set_start(p
, 0);
1139 /* paranoia: catch zero runlength.
1140 * can only happen if bitmap is modified while we scan it. */
1142 drbd_err(device
, "unexpected zero runlength while encoding bitmap "
1143 "t:%u bo:%lu\n", toggle
, c
->bit_offset
);
1147 bits
= vli_encode_bits(&bs
, rl
);
1148 if (bits
== -ENOBUFS
) /* buffer full */
1151 drbd_err(device
, "error while encoding bitmap: %d\n", bits
);
1157 c
->bit_offset
= tmp
;
1158 } while (c
->bit_offset
< c
->bm_bits
);
1160 len
= bs
.cur
.b
- p
->code
+ !!bs
.cur
.bit
;
1162 if (plain_bits
< (len
<< 3)) {
1163 /* incompressible with this method.
1164 * we need to rewind both word and bit position. */
1165 c
->bit_offset
-= plain_bits
;
1166 bm_xfer_ctx_bit_to_word_offset(c
);
1167 c
->bit_offset
= c
->word_offset
* BITS_PER_LONG
;
1171 /* RLE + VLI was able to compress it just fine.
1172 * update c->word_offset. */
1173 bm_xfer_ctx_bit_to_word_offset(c
);
1175 /* store pad_bits */
1176 dcbp_set_pad_bits(p
, (8 - bs
.cur
.bit
) & 0x7);
1182 * send_bitmap_rle_or_plain
1184 * Return 0 when done, 1 when another iteration is needed, and a negative error
1185 * code upon failure.
1188 send_bitmap_rle_or_plain(struct drbd_device
*device
, struct bm_xfer_ctx
*c
)
1190 struct drbd_socket
*sock
= &first_peer_device(device
)->connection
->data
;
1191 unsigned int header_size
= drbd_header_size(first_peer_device(device
)->connection
);
1192 struct p_compressed_bm
*p
= sock
->sbuf
+ header_size
;
1195 len
= fill_bitmap_rle_bits(device
, p
,
1196 DRBD_SOCKET_BUFFER_SIZE
- header_size
- sizeof(*p
), c
);
1201 dcbp_set_code(p
, RLE_VLI_Bits
);
1202 err
= __send_command(first_peer_device(device
)->connection
, device
->vnr
, sock
,
1203 P_COMPRESSED_BITMAP
, sizeof(*p
) + len
,
1206 c
->bytes
[0] += header_size
+ sizeof(*p
) + len
;
1208 if (c
->bit_offset
>= c
->bm_bits
)
1211 /* was not compressible.
1212 * send a buffer full of plain text bits instead. */
1213 unsigned int data_size
;
1214 unsigned long num_words
;
1215 unsigned long *p
= sock
->sbuf
+ header_size
;
1217 data_size
= DRBD_SOCKET_BUFFER_SIZE
- header_size
;
1218 num_words
= min_t(size_t, data_size
/ sizeof(*p
),
1219 c
->bm_words
- c
->word_offset
);
1220 len
= num_words
* sizeof(*p
);
1222 drbd_bm_get_lel(device
, c
->word_offset
, num_words
, p
);
1223 err
= __send_command(first_peer_device(device
)->connection
, device
->vnr
, sock
, P_BITMAP
, len
, NULL
, 0);
1224 c
->word_offset
+= num_words
;
1225 c
->bit_offset
= c
->word_offset
* BITS_PER_LONG
;
1228 c
->bytes
[1] += header_size
+ len
;
1230 if (c
->bit_offset
> c
->bm_bits
)
1231 c
->bit_offset
= c
->bm_bits
;
1235 INFO_bm_xfer_stats(device
, "send", c
);
1243 /* See the comment at receive_bitmap() */
1244 static int _drbd_send_bitmap(struct drbd_device
*device
)
1246 struct bm_xfer_ctx c
;
1249 if (!expect(device
->bitmap
))
1252 if (get_ldev(device
)) {
1253 if (drbd_md_test_flag(device
->ldev
, MDF_FULL_SYNC
)) {
1254 drbd_info(device
, "Writing the whole bitmap, MDF_FullSync was set.\n");
1255 drbd_bm_set_all(device
);
1256 if (drbd_bm_write(device
)) {
1257 /* write_bm did fail! Leave full sync flag set in Meta P_DATA
1258 * but otherwise process as per normal - need to tell other
1259 * side that a full resync is required! */
1260 drbd_err(device
, "Failed to write bitmap to disk!\n");
1262 drbd_md_clear_flag(device
, MDF_FULL_SYNC
);
1263 drbd_md_sync(device
);
1269 c
= (struct bm_xfer_ctx
) {
1270 .bm_bits
= drbd_bm_bits(device
),
1271 .bm_words
= drbd_bm_words(device
),
1275 err
= send_bitmap_rle_or_plain(device
, &c
);
1281 int drbd_send_bitmap(struct drbd_device
*device
)
1283 struct drbd_socket
*sock
= &first_peer_device(device
)->connection
->data
;
1286 mutex_lock(&sock
->mutex
);
1288 err
= !_drbd_send_bitmap(device
);
1289 mutex_unlock(&sock
->mutex
);
1293 void drbd_send_b_ack(struct drbd_connection
*connection
, u32 barrier_nr
, u32 set_size
)
1295 struct drbd_socket
*sock
;
1296 struct p_barrier_ack
*p
;
1298 if (connection
->cstate
< C_WF_REPORT_PARAMS
)
1301 sock
= &connection
->meta
;
1302 p
= conn_prepare_command(connection
, sock
);
1305 p
->barrier
= barrier_nr
;
1306 p
->set_size
= cpu_to_be32(set_size
);
1307 conn_send_command(connection
, sock
, P_BARRIER_ACK
, sizeof(*p
), NULL
, 0);
1311 * _drbd_send_ack() - Sends an ack packet
1312 * @device: DRBD device.
1313 * @cmd: Packet command code.
1314 * @sector: sector, needs to be in big endian byte order
1315 * @blksize: size in byte, needs to be in big endian byte order
1316 * @block_id: Id, big endian byte order
1318 static int _drbd_send_ack(struct drbd_device
*device
, enum drbd_packet cmd
,
1319 u64 sector
, u32 blksize
, u64 block_id
)
1321 struct drbd_socket
*sock
;
1322 struct p_block_ack
*p
;
1324 if (device
->state
.conn
< C_CONNECTED
)
1327 sock
= &first_peer_device(device
)->connection
->meta
;
1328 p
= drbd_prepare_command(device
, sock
);
1332 p
->block_id
= block_id
;
1333 p
->blksize
= blksize
;
1334 p
->seq_num
= cpu_to_be32(atomic_inc_return(&device
->packet_seq
));
1335 return drbd_send_command(device
, sock
, cmd
, sizeof(*p
), NULL
, 0);
1338 /* dp->sector and dp->block_id already/still in network byte order,
1339 * data_size is payload size according to dp->head,
1340 * and may need to be corrected for digest size. */
1341 void drbd_send_ack_dp(struct drbd_device
*device
, enum drbd_packet cmd
,
1342 struct p_data
*dp
, int data_size
)
1344 if (first_peer_device(device
)->connection
->peer_integrity_tfm
)
1345 data_size
-= crypto_hash_digestsize(first_peer_device(device
)->connection
->peer_integrity_tfm
);
1346 _drbd_send_ack(device
, cmd
, dp
->sector
, cpu_to_be32(data_size
),
1350 void drbd_send_ack_rp(struct drbd_device
*device
, enum drbd_packet cmd
,
1351 struct p_block_req
*rp
)
1353 _drbd_send_ack(device
, cmd
, rp
->sector
, rp
->blksize
, rp
->block_id
);
1357 * drbd_send_ack() - Sends an ack packet
1358 * @device: DRBD device
1359 * @cmd: packet command code
1360 * @peer_req: peer request
1362 int drbd_send_ack(struct drbd_device
*device
, enum drbd_packet cmd
,
1363 struct drbd_peer_request
*peer_req
)
1365 return _drbd_send_ack(device
, cmd
,
1366 cpu_to_be64(peer_req
->i
.sector
),
1367 cpu_to_be32(peer_req
->i
.size
),
1368 peer_req
->block_id
);
1371 /* This function misuses the block_id field to signal if the blocks
1372 * are is sync or not. */
1373 int drbd_send_ack_ex(struct drbd_device
*device
, enum drbd_packet cmd
,
1374 sector_t sector
, int blksize
, u64 block_id
)
1376 return _drbd_send_ack(device
, cmd
,
1377 cpu_to_be64(sector
),
1378 cpu_to_be32(blksize
),
1379 cpu_to_be64(block_id
));
1382 int drbd_send_drequest(struct drbd_device
*device
, int cmd
,
1383 sector_t sector
, int size
, u64 block_id
)
1385 struct drbd_socket
*sock
;
1386 struct p_block_req
*p
;
1388 sock
= &first_peer_device(device
)->connection
->data
;
1389 p
= drbd_prepare_command(device
, sock
);
1392 p
->sector
= cpu_to_be64(sector
);
1393 p
->block_id
= block_id
;
1394 p
->blksize
= cpu_to_be32(size
);
1395 return drbd_send_command(device
, sock
, cmd
, sizeof(*p
), NULL
, 0);
1398 int drbd_send_drequest_csum(struct drbd_device
*device
, sector_t sector
, int size
,
1399 void *digest
, int digest_size
, enum drbd_packet cmd
)
1401 struct drbd_socket
*sock
;
1402 struct p_block_req
*p
;
1404 /* FIXME: Put the digest into the preallocated socket buffer. */
1406 sock
= &first_peer_device(device
)->connection
->data
;
1407 p
= drbd_prepare_command(device
, sock
);
1410 p
->sector
= cpu_to_be64(sector
);
1411 p
->block_id
= ID_SYNCER
/* unused */;
1412 p
->blksize
= cpu_to_be32(size
);
1413 return drbd_send_command(device
, sock
, cmd
, sizeof(*p
),
1414 digest
, digest_size
);
1417 int drbd_send_ov_request(struct drbd_device
*device
, sector_t sector
, int size
)
1419 struct drbd_socket
*sock
;
1420 struct p_block_req
*p
;
1422 sock
= &first_peer_device(device
)->connection
->data
;
1423 p
= drbd_prepare_command(device
, sock
);
1426 p
->sector
= cpu_to_be64(sector
);
1427 p
->block_id
= ID_SYNCER
/* unused */;
1428 p
->blksize
= cpu_to_be32(size
);
1429 return drbd_send_command(device
, sock
, P_OV_REQUEST
, sizeof(*p
), NULL
, 0);
1432 /* called on sndtimeo
1433 * returns false if we should retry,
1434 * true if we think connection is dead
1436 static int we_should_drop_the_connection(struct drbd_connection
*connection
, struct socket
*sock
)
1439 /* long elapsed = (long)(jiffies - device->last_received); */
1441 drop_it
= connection
->meta
.socket
== sock
1442 || !connection
->asender
.task
1443 || get_t_state(&connection
->asender
) != RUNNING
1444 || connection
->cstate
< C_WF_REPORT_PARAMS
;
1449 drop_it
= !--connection
->ko_count
;
1451 drbd_err(connection
, "[%s/%d] sock_sendmsg time expired, ko = %u\n",
1452 current
->comm
, current
->pid
, connection
->ko_count
);
1453 request_ping(connection
);
1456 return drop_it
; /* && (device->state == R_PRIMARY) */;
1459 static void drbd_update_congested(struct drbd_connection
*connection
)
1461 struct sock
*sk
= connection
->data
.socket
->sk
;
1462 if (sk
->sk_wmem_queued
> sk
->sk_sndbuf
* 4 / 5)
1463 set_bit(NET_CONGESTED
, &connection
->flags
);
1466 /* The idea of sendpage seems to be to put some kind of reference
1467 * to the page into the skb, and to hand it over to the NIC. In
1468 * this process get_page() gets called.
1470 * As soon as the page was really sent over the network put_page()
1471 * gets called by some part of the network layer. [ NIC driver? ]
1473 * [ get_page() / put_page() increment/decrement the count. If count
1474 * reaches 0 the page will be freed. ]
1476 * This works nicely with pages from FSs.
1477 * But this means that in protocol A we might signal IO completion too early!
1479 * In order not to corrupt data during a resync we must make sure
1480 * that we do not reuse our own buffer pages (EEs) to early, therefore
1481 * we have the net_ee list.
1483 * XFS seems to have problems, still, it submits pages with page_count == 0!
1484 * As a workaround, we disable sendpage on pages
1485 * with page_count == 0 or PageSlab.
1487 static int _drbd_no_send_page(struct drbd_device
*device
, struct page
*page
,
1488 int offset
, size_t size
, unsigned msg_flags
)
1490 struct socket
*socket
;
1494 socket
= first_peer_device(device
)->connection
->data
.socket
;
1495 addr
= kmap(page
) + offset
;
1496 err
= drbd_send_all(first_peer_device(device
)->connection
, socket
, addr
, size
, msg_flags
);
1499 device
->send_cnt
+= size
>> 9;
1503 static int _drbd_send_page(struct drbd_device
*device
, struct page
*page
,
1504 int offset
, size_t size
, unsigned msg_flags
)
1506 struct socket
*socket
= first_peer_device(device
)->connection
->data
.socket
;
1507 mm_segment_t oldfs
= get_fs();
1511 /* e.g. XFS meta- & log-data is in slab pages, which have a
1512 * page_count of 0 and/or have PageSlab() set.
1513 * we cannot use send_page for those, as that does get_page();
1514 * put_page(); and would cause either a VM_BUG directly, or
1515 * __page_cache_release a page that would actually still be referenced
1516 * by someone, leading to some obscure delayed Oops somewhere else. */
1517 if (disable_sendpage
|| (page_count(page
) < 1) || PageSlab(page
))
1518 return _drbd_no_send_page(device
, page
, offset
, size
, msg_flags
);
1520 msg_flags
|= MSG_NOSIGNAL
;
1521 drbd_update_congested(first_peer_device(device
)->connection
);
1526 sent
= socket
->ops
->sendpage(socket
, page
, offset
, len
, msg_flags
);
1528 if (sent
== -EAGAIN
) {
1529 if (we_should_drop_the_connection(first_peer_device(device
)->connection
, socket
))
1533 drbd_warn(device
, "%s: size=%d len=%d sent=%d\n",
1534 __func__
, (int)size
, len
, sent
);
1541 } while (len
> 0 /* THINK && device->cstate >= C_CONNECTED*/);
1543 clear_bit(NET_CONGESTED
, &first_peer_device(device
)->connection
->flags
);
1547 device
->send_cnt
+= size
>> 9;
1552 static int _drbd_send_bio(struct drbd_device
*device
, struct bio
*bio
)
1554 struct bio_vec bvec
;
1555 struct bvec_iter iter
;
1557 /* hint all but last page with MSG_MORE */
1558 bio_for_each_segment(bvec
, bio
, iter
) {
1561 err
= _drbd_no_send_page(device
, bvec
.bv_page
,
1562 bvec
.bv_offset
, bvec
.bv_len
,
1563 bio_iter_last(bvec
, iter
)
1571 static int _drbd_send_zc_bio(struct drbd_device
*device
, struct bio
*bio
)
1573 struct bio_vec bvec
;
1574 struct bvec_iter iter
;
1576 /* hint all but last page with MSG_MORE */
1577 bio_for_each_segment(bvec
, bio
, iter
) {
1580 err
= _drbd_send_page(device
, bvec
.bv_page
,
1581 bvec
.bv_offset
, bvec
.bv_len
,
1582 bio_iter_last(bvec
, iter
) ? 0 : MSG_MORE
);
1589 static int _drbd_send_zc_ee(struct drbd_device
*device
,
1590 struct drbd_peer_request
*peer_req
)
1592 struct page
*page
= peer_req
->pages
;
1593 unsigned len
= peer_req
->i
.size
;
1596 /* hint all but last page with MSG_MORE */
1597 page_chain_for_each(page
) {
1598 unsigned l
= min_t(unsigned, len
, PAGE_SIZE
);
1600 err
= _drbd_send_page(device
, page
, 0, l
,
1601 page_chain_next(page
) ? MSG_MORE
: 0);
1609 static u32
bio_flags_to_wire(struct drbd_device
*device
, unsigned long bi_rw
)
1611 if (first_peer_device(device
)->connection
->agreed_pro_version
>= 95)
1612 return (bi_rw
& REQ_SYNC
? DP_RW_SYNC
: 0) |
1613 (bi_rw
& REQ_FUA
? DP_FUA
: 0) |
1614 (bi_rw
& REQ_FLUSH
? DP_FLUSH
: 0) |
1615 (bi_rw
& REQ_DISCARD
? DP_DISCARD
: 0);
1617 return bi_rw
& REQ_SYNC
? DP_RW_SYNC
: 0;
1620 /* Used to send write requests
1621 * R_PRIMARY -> Peer (P_DATA)
1623 int drbd_send_dblock(struct drbd_device
*device
, struct drbd_request
*req
)
1625 struct drbd_socket
*sock
;
1627 unsigned int dp_flags
= 0;
1631 sock
= &first_peer_device(device
)->connection
->data
;
1632 p
= drbd_prepare_command(device
, sock
);
1633 dgs
= first_peer_device(device
)->connection
->integrity_tfm
?
1634 crypto_hash_digestsize(first_peer_device(device
)->connection
->integrity_tfm
) : 0;
1638 p
->sector
= cpu_to_be64(req
->i
.sector
);
1639 p
->block_id
= (unsigned long)req
;
1640 p
->seq_num
= cpu_to_be32(atomic_inc_return(&device
->packet_seq
));
1641 dp_flags
= bio_flags_to_wire(device
, req
->master_bio
->bi_rw
);
1642 if (device
->state
.conn
>= C_SYNC_SOURCE
&&
1643 device
->state
.conn
<= C_PAUSED_SYNC_T
)
1644 dp_flags
|= DP_MAY_SET_IN_SYNC
;
1645 if (first_peer_device(device
)->connection
->agreed_pro_version
>= 100) {
1646 if (req
->rq_state
& RQ_EXP_RECEIVE_ACK
)
1647 dp_flags
|= DP_SEND_RECEIVE_ACK
;
1648 if (req
->rq_state
& RQ_EXP_WRITE_ACK
)
1649 dp_flags
|= DP_SEND_WRITE_ACK
;
1651 p
->dp_flags
= cpu_to_be32(dp_flags
);
1653 drbd_csum_bio(device
, first_peer_device(device
)->connection
->integrity_tfm
, req
->master_bio
, p
+ 1);
1654 err
= __send_command(first_peer_device(device
)->connection
, device
->vnr
, sock
, P_DATA
, sizeof(*p
) + dgs
, NULL
, req
->i
.size
);
1656 /* For protocol A, we have to memcpy the payload into
1657 * socket buffers, as we may complete right away
1658 * as soon as we handed it over to tcp, at which point the data
1659 * pages may become invalid.
1661 * For data-integrity enabled, we copy it as well, so we can be
1662 * sure that even if the bio pages may still be modified, it
1663 * won't change the data on the wire, thus if the digest checks
1664 * out ok after sending on this side, but does not fit on the
1665 * receiving side, we sure have detected corruption elsewhere.
1667 if (!(req
->rq_state
& (RQ_EXP_RECEIVE_ACK
| RQ_EXP_WRITE_ACK
)) || dgs
)
1668 err
= _drbd_send_bio(device
, req
->master_bio
);
1670 err
= _drbd_send_zc_bio(device
, req
->master_bio
);
1672 /* double check digest, sometimes buffers have been modified in flight. */
1673 if (dgs
> 0 && dgs
<= 64) {
1674 /* 64 byte, 512 bit, is the largest digest size
1675 * currently supported in kernel crypto. */
1676 unsigned char digest
[64];
1677 drbd_csum_bio(device
, first_peer_device(device
)->connection
->integrity_tfm
, req
->master_bio
, digest
);
1678 if (memcmp(p
+ 1, digest
, dgs
)) {
1680 "Digest mismatch, buffer modified by upper layers during write: %llus +%u\n",
1681 (unsigned long long)req
->i
.sector
, req
->i
.size
);
1683 } /* else if (dgs > 64) {
1684 ... Be noisy about digest too large ...
1687 mutex_unlock(&sock
->mutex
); /* locked by drbd_prepare_command() */
1692 /* answer packet, used to send data back for read requests:
1693 * Peer -> (diskless) R_PRIMARY (P_DATA_REPLY)
1694 * C_SYNC_SOURCE -> C_SYNC_TARGET (P_RS_DATA_REPLY)
1696 int drbd_send_block(struct drbd_device
*device
, enum drbd_packet cmd
,
1697 struct drbd_peer_request
*peer_req
)
1699 struct drbd_socket
*sock
;
1704 sock
= &first_peer_device(device
)->connection
->data
;
1705 p
= drbd_prepare_command(device
, sock
);
1707 dgs
= first_peer_device(device
)->connection
->integrity_tfm
?
1708 crypto_hash_digestsize(first_peer_device(device
)->connection
->integrity_tfm
) : 0;
1712 p
->sector
= cpu_to_be64(peer_req
->i
.sector
);
1713 p
->block_id
= peer_req
->block_id
;
1714 p
->seq_num
= 0; /* unused */
1717 drbd_csum_ee(device
, first_peer_device(device
)->connection
->integrity_tfm
, peer_req
, p
+ 1);
1718 err
= __send_command(first_peer_device(device
)->connection
, device
->vnr
, sock
, cmd
, sizeof(*p
) + dgs
, NULL
, peer_req
->i
.size
);
1720 err
= _drbd_send_zc_ee(device
, peer_req
);
1721 mutex_unlock(&sock
->mutex
); /* locked by drbd_prepare_command() */
1726 int drbd_send_out_of_sync(struct drbd_device
*device
, struct drbd_request
*req
)
1728 struct drbd_socket
*sock
;
1729 struct p_block_desc
*p
;
1731 sock
= &first_peer_device(device
)->connection
->data
;
1732 p
= drbd_prepare_command(device
, sock
);
1735 p
->sector
= cpu_to_be64(req
->i
.sector
);
1736 p
->blksize
= cpu_to_be32(req
->i
.size
);
1737 return drbd_send_command(device
, sock
, P_OUT_OF_SYNC
, sizeof(*p
), NULL
, 0);
1741 drbd_send distinguishes two cases:
1743 Packets sent via the data socket "sock"
1744 and packets sent via the meta data socket "msock"
1747 -----------------+-------------------------+------------------------------
1748 timeout conf.timeout / 2 conf.timeout / 2
1749 timeout action send a ping via msock Abort communication
1750 and close all sockets
1754 * you must have down()ed the appropriate [m]sock_mutex elsewhere!
1756 int drbd_send(struct drbd_connection
*connection
, struct socket
*sock
,
1757 void *buf
, size_t size
, unsigned msg_flags
)
1766 /* THINK if (signal_pending) return ... ? */
1771 msg
.msg_name
= NULL
;
1772 msg
.msg_namelen
= 0;
1773 msg
.msg_control
= NULL
;
1774 msg
.msg_controllen
= 0;
1775 msg
.msg_flags
= msg_flags
| MSG_NOSIGNAL
;
1777 if (sock
== connection
->data
.socket
) {
1779 connection
->ko_count
= rcu_dereference(connection
->net_conf
)->ko_count
;
1781 drbd_update_congested(connection
);
1785 * tcp_sendmsg does _not_ use its size parameter at all ?
1787 * -EAGAIN on timeout, -EINTR on signal.
1790 * do we need to block DRBD_SIG if sock == &meta.socket ??
1791 * otherwise wake_asender() might interrupt some send_*Ack !
1793 rv
= kernel_sendmsg(sock
, &msg
, &iov
, 1, size
);
1794 if (rv
== -EAGAIN
) {
1795 if (we_should_drop_the_connection(connection
, sock
))
1801 flush_signals(current
);
1809 } while (sent
< size
);
1811 if (sock
== connection
->data
.socket
)
1812 clear_bit(NET_CONGESTED
, &connection
->flags
);
1815 if (rv
!= -EAGAIN
) {
1816 drbd_err(connection
, "%s_sendmsg returned %d\n",
1817 sock
== connection
->meta
.socket
? "msock" : "sock",
1819 conn_request_state(connection
, NS(conn
, C_BROKEN_PIPE
), CS_HARD
);
1821 conn_request_state(connection
, NS(conn
, C_TIMEOUT
), CS_HARD
);
1828 * drbd_send_all - Send an entire buffer
1830 * Returns 0 upon success and a negative error value otherwise.
1832 int drbd_send_all(struct drbd_connection
*connection
, struct socket
*sock
, void *buffer
,
1833 size_t size
, unsigned msg_flags
)
1837 err
= drbd_send(connection
, sock
, buffer
, size
, msg_flags
);
1845 static int drbd_open(struct block_device
*bdev
, fmode_t mode
)
1847 struct drbd_device
*device
= bdev
->bd_disk
->private_data
;
1848 unsigned long flags
;
1851 mutex_lock(&drbd_main_mutex
);
1852 spin_lock_irqsave(&device
->resource
->req_lock
, flags
);
1853 /* to have a stable device->state.role
1854 * and no race with updating open_cnt */
1856 if (device
->state
.role
!= R_PRIMARY
) {
1857 if (mode
& FMODE_WRITE
)
1859 else if (!allow_oos
)
1865 spin_unlock_irqrestore(&device
->resource
->req_lock
, flags
);
1866 mutex_unlock(&drbd_main_mutex
);
1871 static void drbd_release(struct gendisk
*gd
, fmode_t mode
)
1873 struct drbd_device
*device
= gd
->private_data
;
1874 mutex_lock(&drbd_main_mutex
);
1876 mutex_unlock(&drbd_main_mutex
);
1879 static void drbd_set_defaults(struct drbd_device
*device
)
1881 /* Beware! The actual layout differs
1882 * between big endian and little endian */
1883 device
->state
= (union drbd_dev_state
) {
1884 { .role
= R_SECONDARY
,
1886 .conn
= C_STANDALONE
,
1892 void drbd_init_set_defaults(struct drbd_device
*device
)
1894 /* the memset(,0,) did most of this.
1895 * note: only assignments, no allocation in here */
1897 drbd_set_defaults(device
);
1899 atomic_set(&device
->ap_bio_cnt
, 0);
1900 atomic_set(&device
->ap_pending_cnt
, 0);
1901 atomic_set(&device
->rs_pending_cnt
, 0);
1902 atomic_set(&device
->unacked_cnt
, 0);
1903 atomic_set(&device
->local_cnt
, 0);
1904 atomic_set(&device
->pp_in_use_by_net
, 0);
1905 atomic_set(&device
->rs_sect_in
, 0);
1906 atomic_set(&device
->rs_sect_ev
, 0);
1907 atomic_set(&device
->ap_in_flight
, 0);
1908 atomic_set(&device
->md_io_in_use
, 0);
1910 mutex_init(&device
->own_state_mutex
);
1911 device
->state_mutex
= &device
->own_state_mutex
;
1913 spin_lock_init(&device
->al_lock
);
1914 spin_lock_init(&device
->peer_seq_lock
);
1916 INIT_LIST_HEAD(&device
->active_ee
);
1917 INIT_LIST_HEAD(&device
->sync_ee
);
1918 INIT_LIST_HEAD(&device
->done_ee
);
1919 INIT_LIST_HEAD(&device
->read_ee
);
1920 INIT_LIST_HEAD(&device
->net_ee
);
1921 INIT_LIST_HEAD(&device
->resync_reads
);
1922 INIT_LIST_HEAD(&device
->resync_work
.list
);
1923 INIT_LIST_HEAD(&device
->unplug_work
.list
);
1924 INIT_LIST_HEAD(&device
->go_diskless
.list
);
1925 INIT_LIST_HEAD(&device
->md_sync_work
.list
);
1926 INIT_LIST_HEAD(&device
->start_resync_work
.list
);
1927 INIT_LIST_HEAD(&device
->bm_io_work
.w
.list
);
1929 device
->resync_work
.cb
= w_resync_timer
;
1930 device
->unplug_work
.cb
= w_send_write_hint
;
1931 device
->go_diskless
.cb
= w_go_diskless
;
1932 device
->md_sync_work
.cb
= w_md_sync
;
1933 device
->bm_io_work
.w
.cb
= w_bitmap_io
;
1934 device
->start_resync_work
.cb
= w_start_resync
;
1936 device
->resync_work
.device
= device
;
1937 device
->unplug_work
.device
= device
;
1938 device
->go_diskless
.device
= device
;
1939 device
->md_sync_work
.device
= device
;
1940 device
->bm_io_work
.w
.device
= device
;
1941 device
->start_resync_work
.device
= device
;
1943 init_timer(&device
->resync_timer
);
1944 init_timer(&device
->md_sync_timer
);
1945 init_timer(&device
->start_resync_timer
);
1946 init_timer(&device
->request_timer
);
1947 device
->resync_timer
.function
= resync_timer_fn
;
1948 device
->resync_timer
.data
= (unsigned long) device
;
1949 device
->md_sync_timer
.function
= md_sync_timer_fn
;
1950 device
->md_sync_timer
.data
= (unsigned long) device
;
1951 device
->start_resync_timer
.function
= start_resync_timer_fn
;
1952 device
->start_resync_timer
.data
= (unsigned long) device
;
1953 device
->request_timer
.function
= request_timer_fn
;
1954 device
->request_timer
.data
= (unsigned long) device
;
1956 init_waitqueue_head(&device
->misc_wait
);
1957 init_waitqueue_head(&device
->state_wait
);
1958 init_waitqueue_head(&device
->ee_wait
);
1959 init_waitqueue_head(&device
->al_wait
);
1960 init_waitqueue_head(&device
->seq_wait
);
1962 device
->resync_wenr
= LC_FREE
;
1963 device
->peer_max_bio_size
= DRBD_MAX_BIO_SIZE_SAFE
;
1964 device
->local_max_bio_size
= DRBD_MAX_BIO_SIZE_SAFE
;
1967 void drbd_device_cleanup(struct drbd_device
*device
)
1970 if (first_peer_device(device
)->connection
->receiver
.t_state
!= NONE
)
1971 drbd_err(device
, "ASSERT FAILED: receiver t_state == %d expected 0.\n",
1972 first_peer_device(device
)->connection
->receiver
.t_state
);
1974 device
->al_writ_cnt
=
1975 device
->bm_writ_cnt
=
1983 device
->rs_failed
= 0;
1984 device
->rs_last_events
= 0;
1985 device
->rs_last_sect_ev
= 0;
1986 for (i
= 0; i
< DRBD_SYNC_MARKS
; i
++) {
1987 device
->rs_mark_left
[i
] = 0;
1988 device
->rs_mark_time
[i
] = 0;
1990 D_ASSERT(device
, first_peer_device(device
)->connection
->net_conf
== NULL
);
1992 drbd_set_my_capacity(device
, 0);
1993 if (device
->bitmap
) {
1994 /* maybe never allocated. */
1995 drbd_bm_resize(device
, 0, 1);
1996 drbd_bm_cleanup(device
);
1999 drbd_free_bc(device
->ldev
);
2000 device
->ldev
= NULL
;
2002 clear_bit(AL_SUSPENDED
, &device
->flags
);
2004 D_ASSERT(device
, list_empty(&device
->active_ee
));
2005 D_ASSERT(device
, list_empty(&device
->sync_ee
));
2006 D_ASSERT(device
, list_empty(&device
->done_ee
));
2007 D_ASSERT(device
, list_empty(&device
->read_ee
));
2008 D_ASSERT(device
, list_empty(&device
->net_ee
));
2009 D_ASSERT(device
, list_empty(&device
->resync_reads
));
2010 D_ASSERT(device
, list_empty(&first_peer_device(device
)->connection
->sender_work
.q
));
2011 D_ASSERT(device
, list_empty(&device
->resync_work
.list
));
2012 D_ASSERT(device
, list_empty(&device
->unplug_work
.list
));
2013 D_ASSERT(device
, list_empty(&device
->go_diskless
.list
));
2015 drbd_set_defaults(device
);
2019 static void drbd_destroy_mempools(void)
2023 while (drbd_pp_pool
) {
2024 page
= drbd_pp_pool
;
2025 drbd_pp_pool
= (struct page
*)page_private(page
);
2030 /* D_ASSERT(device, atomic_read(&drbd_pp_vacant)==0); */
2032 if (drbd_md_io_bio_set
)
2033 bioset_free(drbd_md_io_bio_set
);
2034 if (drbd_md_io_page_pool
)
2035 mempool_destroy(drbd_md_io_page_pool
);
2036 if (drbd_ee_mempool
)
2037 mempool_destroy(drbd_ee_mempool
);
2038 if (drbd_request_mempool
)
2039 mempool_destroy(drbd_request_mempool
);
2041 kmem_cache_destroy(drbd_ee_cache
);
2042 if (drbd_request_cache
)
2043 kmem_cache_destroy(drbd_request_cache
);
2044 if (drbd_bm_ext_cache
)
2045 kmem_cache_destroy(drbd_bm_ext_cache
);
2046 if (drbd_al_ext_cache
)
2047 kmem_cache_destroy(drbd_al_ext_cache
);
2049 drbd_md_io_bio_set
= NULL
;
2050 drbd_md_io_page_pool
= NULL
;
2051 drbd_ee_mempool
= NULL
;
2052 drbd_request_mempool
= NULL
;
2053 drbd_ee_cache
= NULL
;
2054 drbd_request_cache
= NULL
;
2055 drbd_bm_ext_cache
= NULL
;
2056 drbd_al_ext_cache
= NULL
;
2061 static int drbd_create_mempools(void)
2064 const int number
= (DRBD_MAX_BIO_SIZE
/PAGE_SIZE
) * minor_count
;
2067 /* prepare our caches and mempools */
2068 drbd_request_mempool
= NULL
;
2069 drbd_ee_cache
= NULL
;
2070 drbd_request_cache
= NULL
;
2071 drbd_bm_ext_cache
= NULL
;
2072 drbd_al_ext_cache
= NULL
;
2073 drbd_pp_pool
= NULL
;
2074 drbd_md_io_page_pool
= NULL
;
2075 drbd_md_io_bio_set
= NULL
;
2078 drbd_request_cache
= kmem_cache_create(
2079 "drbd_req", sizeof(struct drbd_request
), 0, 0, NULL
);
2080 if (drbd_request_cache
== NULL
)
2083 drbd_ee_cache
= kmem_cache_create(
2084 "drbd_ee", sizeof(struct drbd_peer_request
), 0, 0, NULL
);
2085 if (drbd_ee_cache
== NULL
)
2088 drbd_bm_ext_cache
= kmem_cache_create(
2089 "drbd_bm", sizeof(struct bm_extent
), 0, 0, NULL
);
2090 if (drbd_bm_ext_cache
== NULL
)
2093 drbd_al_ext_cache
= kmem_cache_create(
2094 "drbd_al", sizeof(struct lc_element
), 0, 0, NULL
);
2095 if (drbd_al_ext_cache
== NULL
)
2099 drbd_md_io_bio_set
= bioset_create(DRBD_MIN_POOL_PAGES
, 0);
2100 if (drbd_md_io_bio_set
== NULL
)
2103 drbd_md_io_page_pool
= mempool_create_page_pool(DRBD_MIN_POOL_PAGES
, 0);
2104 if (drbd_md_io_page_pool
== NULL
)
2107 drbd_request_mempool
= mempool_create(number
,
2108 mempool_alloc_slab
, mempool_free_slab
, drbd_request_cache
);
2109 if (drbd_request_mempool
== NULL
)
2112 drbd_ee_mempool
= mempool_create(number
,
2113 mempool_alloc_slab
, mempool_free_slab
, drbd_ee_cache
);
2114 if (drbd_ee_mempool
== NULL
)
2117 /* drbd's page pool */
2118 spin_lock_init(&drbd_pp_lock
);
2120 for (i
= 0; i
< number
; i
++) {
2121 page
= alloc_page(GFP_HIGHUSER
);
2124 set_page_private(page
, (unsigned long)drbd_pp_pool
);
2125 drbd_pp_pool
= page
;
2127 drbd_pp_vacant
= number
;
2132 drbd_destroy_mempools(); /* in case we allocated some */
2136 static int drbd_notify_sys(struct notifier_block
*this, unsigned long code
,
2139 /* just so we have it. you never know what interesting things we
2140 * might want to do here some day...
2146 static struct notifier_block drbd_notifier
= {
2147 .notifier_call
= drbd_notify_sys
,
2150 static void drbd_release_all_peer_reqs(struct drbd_device
*device
)
2154 rr
= drbd_free_peer_reqs(device
, &device
->active_ee
);
2156 drbd_err(device
, "%d EEs in active list found!\n", rr
);
2158 rr
= drbd_free_peer_reqs(device
, &device
->sync_ee
);
2160 drbd_err(device
, "%d EEs in sync list found!\n", rr
);
2162 rr
= drbd_free_peer_reqs(device
, &device
->read_ee
);
2164 drbd_err(device
, "%d EEs in read list found!\n", rr
);
2166 rr
= drbd_free_peer_reqs(device
, &device
->done_ee
);
2168 drbd_err(device
, "%d EEs in done list found!\n", rr
);
2170 rr
= drbd_free_peer_reqs(device
, &device
->net_ee
);
2172 drbd_err(device
, "%d EEs in net list found!\n", rr
);
2175 /* caution. no locking. */
2176 void drbd_destroy_device(struct kref
*kref
)
2178 struct drbd_device
*device
= container_of(kref
, struct drbd_device
, kref
);
2179 struct drbd_resource
*resource
= device
->resource
;
2180 struct drbd_connection
*connection
;
2182 del_timer_sync(&device
->request_timer
);
2184 /* paranoia asserts */
2185 D_ASSERT(device
, device
->open_cnt
== 0);
2186 /* end paranoia asserts */
2188 /* cleanup stuff that may have been allocated during
2189 * device (re-)configuration or state changes */
2191 if (device
->this_bdev
)
2192 bdput(device
->this_bdev
);
2194 drbd_free_bc(device
->ldev
);
2195 device
->ldev
= NULL
;
2197 drbd_release_all_peer_reqs(device
);
2199 lc_destroy(device
->act_log
);
2200 lc_destroy(device
->resync
);
2202 kfree(device
->p_uuid
);
2203 /* device->p_uuid = NULL; */
2205 if (device
->bitmap
) /* should no longer be there. */
2206 drbd_bm_cleanup(device
);
2207 __free_page(device
->md_io_page
);
2208 put_disk(device
->vdisk
);
2209 blk_cleanup_queue(device
->rq_queue
);
2210 kfree(device
->rs_plan_s
);
2211 kfree(first_peer_device(device
));
2214 for_each_connection(connection
, resource
)
2215 kref_put(&connection
->kref
, drbd_destroy_connection
);
2216 kref_put(&resource
->kref
, drbd_destroy_resource
);
2219 /* One global retry thread, if we need to push back some bio and have it
2220 * reinserted through our make request function.
2222 static struct retry_worker
{
2223 struct workqueue_struct
*wq
;
2224 struct work_struct worker
;
2227 struct list_head writes
;
2230 static void do_retry(struct work_struct
*ws
)
2232 struct retry_worker
*retry
= container_of(ws
, struct retry_worker
, worker
);
2234 struct drbd_request
*req
, *tmp
;
2236 spin_lock_irq(&retry
->lock
);
2237 list_splice_init(&retry
->writes
, &writes
);
2238 spin_unlock_irq(&retry
->lock
);
2240 list_for_each_entry_safe(req
, tmp
, &writes
, tl_requests
) {
2241 struct drbd_device
*device
= req
->w
.device
;
2242 struct bio
*bio
= req
->master_bio
;
2243 unsigned long start_time
= req
->start_time
;
2247 expect(atomic_read(&req
->completion_ref
) == 0) &&
2248 expect(req
->rq_state
& RQ_POSTPONED
) &&
2249 expect((req
->rq_state
& RQ_LOCAL_PENDING
) == 0 ||
2250 (req
->rq_state
& RQ_LOCAL_ABORTED
) != 0);
2253 drbd_err(device
, "req=%p completion_ref=%d rq_state=%x\n",
2254 req
, atomic_read(&req
->completion_ref
),
2257 /* We still need to put one kref associated with the
2258 * "completion_ref" going zero in the code path that queued it
2259 * here. The request object may still be referenced by a
2260 * frozen local req->private_bio, in case we force-detached.
2262 kref_put(&req
->kref
, drbd_req_destroy
);
2264 /* A single suspended or otherwise blocking device may stall
2265 * all others as well. Fortunately, this code path is to
2266 * recover from a situation that "should not happen":
2267 * concurrent writes in multi-primary setup.
2268 * In a "normal" lifecycle, this workqueue is supposed to be
2269 * destroyed without ever doing anything.
2270 * If it turns out to be an issue anyways, we can do per
2271 * resource (replication group) or per device (minor) retry
2272 * workqueues instead.
2275 /* We are not just doing generic_make_request(),
2276 * as we want to keep the start_time information. */
2278 __drbd_make_request(device
, bio
, start_time
);
2282 void drbd_restart_request(struct drbd_request
*req
)
2284 unsigned long flags
;
2285 spin_lock_irqsave(&retry
.lock
, flags
);
2286 list_move_tail(&req
->tl_requests
, &retry
.writes
);
2287 spin_unlock_irqrestore(&retry
.lock
, flags
);
2289 /* Drop the extra reference that would otherwise
2290 * have been dropped by complete_master_bio.
2291 * do_retry() needs to grab a new one. */
2292 dec_ap_bio(req
->w
.device
);
2294 queue_work(retry
.wq
, &retry
.worker
);
2297 void drbd_destroy_resource(struct kref
*kref
)
2299 struct drbd_resource
*resource
=
2300 container_of(kref
, struct drbd_resource
, kref
);
2302 idr_destroy(&resource
->devices
);
2303 free_cpumask_var(resource
->cpu_mask
);
2304 kfree(resource
->name
);
2308 void drbd_free_resource(struct drbd_resource
*resource
)
2310 struct drbd_connection
*connection
, *tmp
;
2312 for_each_connection_safe(connection
, tmp
, resource
) {
2313 list_del(&connection
->connections
);
2314 kref_put(&connection
->kref
, drbd_destroy_connection
);
2316 kref_put(&resource
->kref
, drbd_destroy_resource
);
2319 static void drbd_cleanup(void)
2322 struct drbd_device
*device
;
2323 struct drbd_resource
*resource
, *tmp
;
2325 unregister_reboot_notifier(&drbd_notifier
);
2327 /* first remove proc,
2328 * drbdsetup uses it's presence to detect
2329 * whether DRBD is loaded.
2330 * If we would get stuck in proc removal,
2331 * but have netlink already deregistered,
2332 * some drbdsetup commands may wait forever
2336 remove_proc_entry("drbd", NULL
);
2339 destroy_workqueue(retry
.wq
);
2341 drbd_genl_unregister();
2343 idr_for_each_entry(&drbd_devices
, device
, i
)
2344 drbd_delete_device(device
);
2346 /* not _rcu since, no other updater anymore. Genl already unregistered */
2347 for_each_resource_safe(resource
, tmp
, &drbd_resources
) {
2348 list_del(&resource
->resources
);
2349 drbd_free_resource(resource
);
2352 drbd_destroy_mempools();
2353 unregister_blkdev(DRBD_MAJOR
, "drbd");
2355 idr_destroy(&drbd_devices
);
2357 printk(KERN_INFO
"drbd: module cleanup done.\n");
2361 * drbd_congested() - Callback for the flusher thread
2362 * @congested_data: User data
2363 * @bdi_bits: Bits the BDI flusher thread is currently interested in
2365 * Returns 1<<BDI_async_congested and/or 1<<BDI_sync_congested if we are congested.
2367 static int drbd_congested(void *congested_data
, int bdi_bits
)
2369 struct drbd_device
*device
= congested_data
;
2370 struct request_queue
*q
;
2374 if (!may_inc_ap_bio(device
)) {
2375 /* DRBD has frozen IO */
2381 if (test_bit(CALLBACK_PENDING
, &first_peer_device(device
)->connection
->flags
)) {
2382 r
|= (1 << BDI_async_congested
);
2383 /* Without good local data, we would need to read from remote,
2384 * and that would need the worker thread as well, which is
2385 * currently blocked waiting for that usermode helper to
2388 if (!get_ldev_if_state(device
, D_UP_TO_DATE
))
2389 r
|= (1 << BDI_sync_congested
);
2397 if (get_ldev(device
)) {
2398 q
= bdev_get_queue(device
->ldev
->backing_bdev
);
2399 r
= bdi_congested(&q
->backing_dev_info
, bdi_bits
);
2405 if (bdi_bits
& (1 << BDI_async_congested
) &&
2406 test_bit(NET_CONGESTED
, &first_peer_device(device
)->connection
->flags
)) {
2407 r
|= (1 << BDI_async_congested
);
2408 reason
= reason
== 'b' ? 'a' : 'n';
2412 device
->congestion_reason
= reason
;
2416 static void drbd_init_workqueue(struct drbd_work_queue
* wq
)
2418 spin_lock_init(&wq
->q_lock
);
2419 INIT_LIST_HEAD(&wq
->q
);
2420 init_waitqueue_head(&wq
->q_wait
);
2423 struct drbd_resource
*drbd_find_resource(const char *name
)
2425 struct drbd_resource
*resource
;
2427 if (!name
|| !name
[0])
2431 for_each_resource_rcu(resource
, &drbd_resources
) {
2432 if (!strcmp(resource
->name
, name
)) {
2433 kref_get(&resource
->kref
);
2443 struct drbd_connection
*conn_get_by_addrs(void *my_addr
, int my_addr_len
,
2444 void *peer_addr
, int peer_addr_len
)
2446 struct drbd_resource
*resource
;
2447 struct drbd_connection
*connection
;
2450 for_each_resource_rcu(resource
, &drbd_resources
) {
2451 for_each_connection_rcu(connection
, resource
) {
2452 if (connection
->my_addr_len
== my_addr_len
&&
2453 connection
->peer_addr_len
== peer_addr_len
&&
2454 !memcmp(&connection
->my_addr
, my_addr
, my_addr_len
) &&
2455 !memcmp(&connection
->peer_addr
, peer_addr
, peer_addr_len
)) {
2456 kref_get(&connection
->kref
);
2467 static int drbd_alloc_socket(struct drbd_socket
*socket
)
2469 socket
->rbuf
= (void *) __get_free_page(GFP_KERNEL
);
2472 socket
->sbuf
= (void *) __get_free_page(GFP_KERNEL
);
2478 static void drbd_free_socket(struct drbd_socket
*socket
)
2480 free_page((unsigned long) socket
->sbuf
);
2481 free_page((unsigned long) socket
->rbuf
);
2484 void conn_free_crypto(struct drbd_connection
*connection
)
2486 drbd_free_sock(connection
);
2488 crypto_free_hash(connection
->csums_tfm
);
2489 crypto_free_hash(connection
->verify_tfm
);
2490 crypto_free_hash(connection
->cram_hmac_tfm
);
2491 crypto_free_hash(connection
->integrity_tfm
);
2492 crypto_free_hash(connection
->peer_integrity_tfm
);
2493 kfree(connection
->int_dig_in
);
2494 kfree(connection
->int_dig_vv
);
2496 connection
->csums_tfm
= NULL
;
2497 connection
->verify_tfm
= NULL
;
2498 connection
->cram_hmac_tfm
= NULL
;
2499 connection
->integrity_tfm
= NULL
;
2500 connection
->peer_integrity_tfm
= NULL
;
2501 connection
->int_dig_in
= NULL
;
2502 connection
->int_dig_vv
= NULL
;
2505 int set_resource_options(struct drbd_resource
*resource
, struct res_opts
*res_opts
)
2507 struct drbd_connection
*connection
;
2508 cpumask_var_t new_cpu_mask
;
2511 if (!zalloc_cpumask_var(&new_cpu_mask
, GFP_KERNEL
))
2514 retcode = ERR_NOMEM;
2515 drbd_msg_put_info("unable to allocate cpumask");
2518 /* silently ignore cpu mask on UP kernel */
2519 if (nr_cpu_ids
> 1 && res_opts
->cpu_mask
[0] != 0) {
2520 err
= bitmap_parse(res_opts
->cpu_mask
, DRBD_CPU_MASK_SIZE
,
2521 cpumask_bits(new_cpu_mask
), nr_cpu_ids
);
2523 drbd_warn(resource
, "bitmap_parse() failed with %d\n", err
);
2524 /* retcode = ERR_CPU_MASK_PARSE; */
2528 resource
->res_opts
= *res_opts
;
2529 if (cpumask_empty(new_cpu_mask
))
2530 drbd_calc_cpu_mask(&new_cpu_mask
);
2531 if (!cpumask_equal(resource
->cpu_mask
, new_cpu_mask
)) {
2532 cpumask_copy(resource
->cpu_mask
, new_cpu_mask
);
2533 for_each_connection_rcu(connection
, resource
) {
2534 connection
->receiver
.reset_cpu_mask
= 1;
2535 connection
->asender
.reset_cpu_mask
= 1;
2536 connection
->worker
.reset_cpu_mask
= 1;
2542 free_cpumask_var(new_cpu_mask
);
2547 struct drbd_resource
*drbd_create_resource(const char *name
)
2549 struct drbd_resource
*resource
;
2551 resource
= kzalloc(sizeof(struct drbd_resource
), GFP_KERNEL
);
2554 resource
->name
= kstrdup(name
, GFP_KERNEL
);
2555 if (!resource
->name
)
2556 goto fail_free_resource
;
2557 if (!zalloc_cpumask_var(&resource
->cpu_mask
, GFP_KERNEL
))
2558 goto fail_free_name
;
2559 kref_init(&resource
->kref
);
2560 idr_init(&resource
->devices
);
2561 INIT_LIST_HEAD(&resource
->connections
);
2562 list_add_tail_rcu(&resource
->resources
, &drbd_resources
);
2563 mutex_init(&resource
->conf_update
);
2564 spin_lock_init(&resource
->req_lock
);
2568 kfree(resource
->name
);
2575 /* caller must be under genl_lock() */
2576 struct drbd_connection
*conn_create(const char *name
, struct res_opts
*res_opts
)
2578 struct drbd_resource
*resource
;
2579 struct drbd_connection
*connection
;
2581 connection
= kzalloc(sizeof(struct drbd_connection
), GFP_KERNEL
);
2585 if (drbd_alloc_socket(&connection
->data
))
2587 if (drbd_alloc_socket(&connection
->meta
))
2590 connection
->current_epoch
= kzalloc(sizeof(struct drbd_epoch
), GFP_KERNEL
);
2591 if (!connection
->current_epoch
)
2594 INIT_LIST_HEAD(&connection
->transfer_log
);
2596 INIT_LIST_HEAD(&connection
->current_epoch
->list
);
2597 connection
->epochs
= 1;
2598 spin_lock_init(&connection
->epoch_lock
);
2599 connection
->write_ordering
= WO_bdev_flush
;
2601 connection
->send
.seen_any_write_yet
= false;
2602 connection
->send
.current_epoch_nr
= 0;
2603 connection
->send
.current_epoch_writes
= 0;
2605 resource
= drbd_create_resource(name
);
2609 connection
->cstate
= C_STANDALONE
;
2610 mutex_init(&connection
->cstate_mutex
);
2611 init_waitqueue_head(&connection
->ping_wait
);
2612 idr_init(&connection
->peer_devices
);
2614 drbd_init_workqueue(&connection
->sender_work
);
2615 mutex_init(&connection
->data
.mutex
);
2616 mutex_init(&connection
->meta
.mutex
);
2618 drbd_thread_init(connection
, &connection
->receiver
, drbd_receiver
, "receiver");
2619 drbd_thread_init(connection
, &connection
->worker
, drbd_worker
, "worker");
2620 drbd_thread_init(connection
, &connection
->asender
, drbd_asender
, "asender");
2622 kref_init(&connection
->kref
);
2624 connection
->resource
= resource
;
2626 if (set_resource_options(resource
, res_opts
))
2629 kref_get(&resource
->kref
);
2630 list_add_tail_rcu(&connection
->connections
, &resource
->connections
);
2634 list_del(&resource
->resources
);
2635 drbd_free_resource(resource
);
2637 kfree(connection
->current_epoch
);
2638 drbd_free_socket(&connection
->meta
);
2639 drbd_free_socket(&connection
->data
);
2644 void drbd_destroy_connection(struct kref
*kref
)
2646 struct drbd_connection
*connection
= container_of(kref
, struct drbd_connection
, kref
);
2647 struct drbd_resource
*resource
= connection
->resource
;
2649 if (atomic_read(&connection
->current_epoch
->epoch_size
) != 0)
2650 drbd_err(connection
, "epoch_size:%d\n", atomic_read(&connection
->current_epoch
->epoch_size
));
2651 kfree(connection
->current_epoch
);
2653 idr_destroy(&connection
->peer_devices
);
2655 drbd_free_socket(&connection
->meta
);
2656 drbd_free_socket(&connection
->data
);
2657 kfree(connection
->int_dig_in
);
2658 kfree(connection
->int_dig_vv
);
2660 kref_put(&resource
->kref
, drbd_destroy_resource
);
2663 static int init_submitter(struct drbd_device
*device
)
2665 /* opencoded create_singlethread_workqueue(),
2666 * to be able to say "drbd%d", ..., minor */
2667 device
->submit
.wq
= alloc_workqueue("drbd%u_submit",
2668 WQ_UNBOUND
| WQ_MEM_RECLAIM
, 1, device
->minor
);
2669 if (!device
->submit
.wq
)
2672 INIT_WORK(&device
->submit
.worker
, do_submit
);
2673 spin_lock_init(&device
->submit
.lock
);
2674 INIT_LIST_HEAD(&device
->submit
.writes
);
2678 enum drbd_ret_code
drbd_create_device(struct drbd_resource
*resource
, unsigned int minor
, int vnr
)
2680 struct drbd_connection
*connection
;
2681 struct drbd_device
*device
;
2682 struct drbd_peer_device
*peer_device
, *tmp_peer_device
;
2683 struct gendisk
*disk
;
2684 struct request_queue
*q
;
2686 enum drbd_ret_code err
= ERR_NOMEM
;
2688 device
= minor_to_device(minor
);
2690 return ERR_MINOR_EXISTS
;
2692 /* GFP_KERNEL, we are outside of all write-out paths */
2693 device
= kzalloc(sizeof(struct drbd_device
), GFP_KERNEL
);
2696 kref_init(&device
->kref
);
2698 kref_get(&resource
->kref
);
2699 device
->resource
= resource
;
2700 device
->minor
= minor
;
2703 drbd_init_set_defaults(device
);
2705 q
= blk_alloc_queue(GFP_KERNEL
);
2708 device
->rq_queue
= q
;
2709 q
->queuedata
= device
;
2711 disk
= alloc_disk(1);
2714 device
->vdisk
= disk
;
2716 set_disk_ro(disk
, true);
2719 disk
->major
= DRBD_MAJOR
;
2720 disk
->first_minor
= minor
;
2721 disk
->fops
= &drbd_ops
;
2722 sprintf(disk
->disk_name
, "drbd%d", minor
);
2723 disk
->private_data
= device
;
2725 device
->this_bdev
= bdget(MKDEV(DRBD_MAJOR
, minor
));
2726 /* we have no partitions. we contain only ourselves. */
2727 device
->this_bdev
->bd_contains
= device
->this_bdev
;
2729 q
->backing_dev_info
.congested_fn
= drbd_congested
;
2730 q
->backing_dev_info
.congested_data
= device
;
2732 blk_queue_make_request(q
, drbd_make_request
);
2733 blk_queue_flush(q
, REQ_FLUSH
| REQ_FUA
);
2734 /* Setting the max_hw_sectors to an odd value of 8kibyte here
2735 This triggers a max_bio_size message upon first attach or connect */
2736 blk_queue_max_hw_sectors(q
, DRBD_MAX_BIO_SIZE_SAFE
>> 8);
2737 blk_queue_bounce_limit(q
, BLK_BOUNCE_ANY
);
2738 blk_queue_merge_bvec(q
, drbd_merge_bvec
);
2739 q
->queue_lock
= &resource
->req_lock
;
2741 device
->md_io_page
= alloc_page(GFP_KERNEL
);
2742 if (!device
->md_io_page
)
2743 goto out_no_io_page
;
2745 if (drbd_bm_init(device
))
2747 device
->read_requests
= RB_ROOT
;
2748 device
->write_requests
= RB_ROOT
;
2750 id
= idr_alloc(&drbd_devices
, device
, minor
, minor
+ 1, GFP_KERNEL
);
2752 if (id
== -ENOSPC
) {
2753 err
= ERR_MINOR_EXISTS
;
2754 drbd_msg_put_info("requested minor exists already");
2756 goto out_no_minor_idr
;
2758 kref_get(&device
->kref
);
2760 id
= idr_alloc(&resource
->devices
, device
, vnr
, vnr
+ 1, GFP_KERNEL
);
2762 if (id
== -ENOSPC
) {
2763 err
= ERR_MINOR_EXISTS
;
2764 drbd_msg_put_info("requested minor exists already");
2766 goto out_idr_remove_minor
;
2768 kref_get(&device
->kref
);
2770 INIT_LIST_HEAD(&device
->peer_devices
);
2771 for_each_connection(connection
, resource
) {
2772 peer_device
= kzalloc(sizeof(struct drbd_peer_device
), GFP_KERNEL
);
2774 goto out_idr_remove_from_resource
;
2775 peer_device
->connection
= connection
;
2776 peer_device
->device
= device
;
2778 list_add(&peer_device
->peer_devices
, &device
->peer_devices
);
2779 kref_get(&device
->kref
);
2781 id
= idr_alloc(&connection
->peer_devices
, peer_device
, vnr
, vnr
+ 1, GFP_KERNEL
);
2783 if (id
== -ENOSPC
) {
2784 err
= ERR_INVALID_REQUEST
;
2785 drbd_msg_put_info("requested volume exists already");
2787 goto out_idr_remove_from_resource
;
2789 kref_get(&connection
->kref
);
2792 if (init_submitter(device
)) {
2794 drbd_msg_put_info("unable to create submit workqueue");
2795 goto out_idr_remove_vol
;
2800 /* inherit the connection state */
2801 device
->state
.conn
= first_connection(resource
)->cstate
;
2802 if (device
->state
.conn
== C_WF_REPORT_PARAMS
)
2803 drbd_connected(device
);
2808 idr_remove(&connection
->peer_devices
, vnr
);
2809 out_idr_remove_from_resource
:
2810 for_each_connection(connection
, resource
) {
2811 peer_device
= idr_find(&connection
->peer_devices
, vnr
);
2813 idr_remove(&connection
->peer_devices
, vnr
);
2814 kref_put(&connection
->kref
, drbd_destroy_connection
);
2817 for_each_peer_device_safe(peer_device
, tmp_peer_device
, device
) {
2818 list_del(&peer_device
->peer_devices
);
2821 idr_remove(&resource
->devices
, vnr
);
2822 out_idr_remove_minor
:
2823 idr_remove(&drbd_devices
, minor
);
2826 drbd_bm_cleanup(device
);
2828 __free_page(device
->md_io_page
);
2832 blk_cleanup_queue(q
);
2834 kref_put(&resource
->kref
, drbd_destroy_resource
);
2839 void drbd_delete_device(struct drbd_device
*device
)
2841 struct drbd_resource
*resource
= device
->resource
;
2842 struct drbd_connection
*connection
;
2845 for_each_connection(connection
, resource
) {
2846 idr_remove(&connection
->peer_devices
, device
->vnr
);
2849 idr_remove(&resource
->devices
, device
->vnr
);
2850 idr_remove(&drbd_devices
, device_to_minor(device
));
2851 del_gendisk(device
->vdisk
);
2853 kref_sub(&device
->kref
, refs
, drbd_destroy_device
);
2856 int __init
drbd_init(void)
2860 if (minor_count
< DRBD_MINOR_COUNT_MIN
|| minor_count
> DRBD_MINOR_COUNT_MAX
) {
2862 "drbd: invalid minor_count (%d)\n", minor_count
);
2866 minor_count
= DRBD_MINOR_COUNT_DEF
;
2870 err
= register_blkdev(DRBD_MAJOR
, "drbd");
2873 "drbd: unable to register block device major %d\n",
2878 register_reboot_notifier(&drbd_notifier
);
2881 * allocate all necessary structs
2883 init_waitqueue_head(&drbd_pp_wait
);
2885 drbd_proc
= NULL
; /* play safe for drbd_cleanup */
2886 idr_init(&drbd_devices
);
2888 rwlock_init(&global_state_lock
);
2889 INIT_LIST_HEAD(&drbd_resources
);
2891 err
= drbd_genl_register();
2893 printk(KERN_ERR
"drbd: unable to register generic netlink family\n");
2897 err
= drbd_create_mempools();
2902 drbd_proc
= proc_create_data("drbd", S_IFREG
| S_IRUGO
, NULL
, &drbd_proc_fops
, NULL
);
2904 printk(KERN_ERR
"drbd: unable to register proc file\n");
2908 retry
.wq
= create_singlethread_workqueue("drbd-reissue");
2910 printk(KERN_ERR
"drbd: unable to create retry workqueue\n");
2913 INIT_WORK(&retry
.worker
, do_retry
);
2914 spin_lock_init(&retry
.lock
);
2915 INIT_LIST_HEAD(&retry
.writes
);
2917 printk(KERN_INFO
"drbd: initialized. "
2918 "Version: " REL_VERSION
" (api:%d/proto:%d-%d)\n",
2919 API_VERSION
, PRO_VERSION_MIN
, PRO_VERSION_MAX
);
2920 printk(KERN_INFO
"drbd: %s\n", drbd_buildtag());
2921 printk(KERN_INFO
"drbd: registered as block device major %d\n",
2924 return 0; /* Success! */
2929 printk(KERN_ERR
"drbd: ran out of memory\n");
2931 printk(KERN_ERR
"drbd: initialization failure\n");
2935 void drbd_free_bc(struct drbd_backing_dev
*ldev
)
2940 blkdev_put(ldev
->backing_bdev
, FMODE_READ
| FMODE_WRITE
| FMODE_EXCL
);
2941 blkdev_put(ldev
->md_bdev
, FMODE_READ
| FMODE_WRITE
| FMODE_EXCL
);
2943 kfree(ldev
->disk_conf
);
2947 void drbd_free_sock(struct drbd_connection
*connection
)
2949 if (connection
->data
.socket
) {
2950 mutex_lock(&connection
->data
.mutex
);
2951 kernel_sock_shutdown(connection
->data
.socket
, SHUT_RDWR
);
2952 sock_release(connection
->data
.socket
);
2953 connection
->data
.socket
= NULL
;
2954 mutex_unlock(&connection
->data
.mutex
);
2956 if (connection
->meta
.socket
) {
2957 mutex_lock(&connection
->meta
.mutex
);
2958 kernel_sock_shutdown(connection
->meta
.socket
, SHUT_RDWR
);
2959 sock_release(connection
->meta
.socket
);
2960 connection
->meta
.socket
= NULL
;
2961 mutex_unlock(&connection
->meta
.mutex
);
2965 /* meta data management */
2967 void conn_md_sync(struct drbd_connection
*connection
)
2969 struct drbd_peer_device
*peer_device
;
2973 idr_for_each_entry(&connection
->peer_devices
, peer_device
, vnr
) {
2974 struct drbd_device
*device
= peer_device
->device
;
2976 kref_get(&device
->kref
);
2978 drbd_md_sync(device
);
2979 kref_put(&device
->kref
, drbd_destroy_device
);
2985 /* aligned 4kByte */
2986 struct meta_data_on_disk
{
2987 u64 la_size_sect
; /* last agreed size. */
2988 u64 uuid
[UI_SIZE
]; /* UUIDs. */
2991 u32 flags
; /* MDF */
2994 u32 al_offset
; /* offset to this block */
2995 u32 al_nr_extents
; /* important for restoring the AL (userspace) */
2996 /* `-- act_log->nr_elements <-- ldev->dc.al_extents */
2997 u32 bm_offset
; /* offset to the bitmap, from here */
2998 u32 bm_bytes_per_bit
; /* BM_BLOCK_SIZE */
2999 u32 la_peer_max_bio_size
; /* last peer max_bio_size */
3001 /* see al_tr_number_to_on_disk_sector() */
3003 u32 al_stripe_size_4k
;
3005 u8 reserved_u8
[4096 - (7*8 + 10*4)];
3010 void drbd_md_write(struct drbd_device
*device
, void *b
)
3012 struct meta_data_on_disk
*buffer
= b
;
3016 memset(buffer
, 0, sizeof(*buffer
));
3018 buffer
->la_size_sect
= cpu_to_be64(drbd_get_capacity(device
->this_bdev
));
3019 for (i
= UI_CURRENT
; i
< UI_SIZE
; i
++)
3020 buffer
->uuid
[i
] = cpu_to_be64(device
->ldev
->md
.uuid
[i
]);
3021 buffer
->flags
= cpu_to_be32(device
->ldev
->md
.flags
);
3022 buffer
->magic
= cpu_to_be32(DRBD_MD_MAGIC_84_UNCLEAN
);
3024 buffer
->md_size_sect
= cpu_to_be32(device
->ldev
->md
.md_size_sect
);
3025 buffer
->al_offset
= cpu_to_be32(device
->ldev
->md
.al_offset
);
3026 buffer
->al_nr_extents
= cpu_to_be32(device
->act_log
->nr_elements
);
3027 buffer
->bm_bytes_per_bit
= cpu_to_be32(BM_BLOCK_SIZE
);
3028 buffer
->device_uuid
= cpu_to_be64(device
->ldev
->md
.device_uuid
);
3030 buffer
->bm_offset
= cpu_to_be32(device
->ldev
->md
.bm_offset
);
3031 buffer
->la_peer_max_bio_size
= cpu_to_be32(device
->peer_max_bio_size
);
3033 buffer
->al_stripes
= cpu_to_be32(device
->ldev
->md
.al_stripes
);
3034 buffer
->al_stripe_size_4k
= cpu_to_be32(device
->ldev
->md
.al_stripe_size_4k
);
3036 D_ASSERT(device
, drbd_md_ss(device
->ldev
) == device
->ldev
->md
.md_offset
);
3037 sector
= device
->ldev
->md
.md_offset
;
3039 if (drbd_md_sync_page_io(device
, device
->ldev
, sector
, WRITE
)) {
3040 /* this was a try anyways ... */
3041 drbd_err(device
, "meta data update failed!\n");
3042 drbd_chk_io_error(device
, 1, DRBD_META_IO_ERROR
);
3047 * drbd_md_sync() - Writes the meta data super block if the MD_DIRTY flag bit is set
3048 * @device: DRBD device.
3050 void drbd_md_sync(struct drbd_device
*device
)
3052 struct meta_data_on_disk
*buffer
;
3054 /* Don't accidentally change the DRBD meta data layout. */
3055 BUILD_BUG_ON(UI_SIZE
!= 4);
3056 BUILD_BUG_ON(sizeof(struct meta_data_on_disk
) != 4096);
3058 del_timer(&device
->md_sync_timer
);
3059 /* timer may be rearmed by drbd_md_mark_dirty() now. */
3060 if (!test_and_clear_bit(MD_DIRTY
, &device
->flags
))
3063 /* We use here D_FAILED and not D_ATTACHING because we try to write
3064 * metadata even if we detach due to a disk failure! */
3065 if (!get_ldev_if_state(device
, D_FAILED
))
3068 buffer
= drbd_md_get_buffer(device
);
3072 drbd_md_write(device
, buffer
);
3074 /* Update device->ldev->md.la_size_sect,
3075 * since we updated it on metadata. */
3076 device
->ldev
->md
.la_size_sect
= drbd_get_capacity(device
->this_bdev
);
3078 drbd_md_put_buffer(device
);
3083 static int check_activity_log_stripe_size(struct drbd_device
*device
,
3084 struct meta_data_on_disk
*on_disk
,
3085 struct drbd_md
*in_core
)
3087 u32 al_stripes
= be32_to_cpu(on_disk
->al_stripes
);
3088 u32 al_stripe_size_4k
= be32_to_cpu(on_disk
->al_stripe_size_4k
);
3091 /* both not set: default to old fixed size activity log */
3092 if (al_stripes
== 0 && al_stripe_size_4k
== 0) {
3094 al_stripe_size_4k
= MD_32kB_SECT
/8;
3097 /* some paranoia plausibility checks */
3099 /* we need both values to be set */
3100 if (al_stripes
== 0 || al_stripe_size_4k
== 0)
3103 al_size_4k
= (u64
)al_stripes
* al_stripe_size_4k
;
3105 /* Upper limit of activity log area, to avoid potential overflow
3106 * problems in al_tr_number_to_on_disk_sector(). As right now, more
3107 * than 72 * 4k blocks total only increases the amount of history,
3108 * limiting this arbitrarily to 16 GB is not a real limitation ;-) */
3109 if (al_size_4k
> (16 * 1024 * 1024/4))
3112 /* Lower limit: we need at least 8 transaction slots (32kB)
3113 * to not break existing setups */
3114 if (al_size_4k
< MD_32kB_SECT
/8)
3117 in_core
->al_stripe_size_4k
= al_stripe_size_4k
;
3118 in_core
->al_stripes
= al_stripes
;
3119 in_core
->al_size_4k
= al_size_4k
;
3123 drbd_err(device
, "invalid activity log striping: al_stripes=%u, al_stripe_size_4k=%u\n",
3124 al_stripes
, al_stripe_size_4k
);
3128 static int check_offsets_and_sizes(struct drbd_device
*device
, struct drbd_backing_dev
*bdev
)
3130 sector_t capacity
= drbd_get_capacity(bdev
->md_bdev
);
3131 struct drbd_md
*in_core
= &bdev
->md
;
3132 s32 on_disk_al_sect
;
3133 s32 on_disk_bm_sect
;
3135 /* The on-disk size of the activity log, calculated from offsets, and
3136 * the size of the activity log calculated from the stripe settings,
3138 * Though we could relax this a bit: it is ok, if the striped activity log
3139 * fits in the available on-disk activity log size.
3140 * Right now, that would break how resize is implemented.
3141 * TODO: make drbd_determine_dev_size() (and the drbdmeta tool) aware
3142 * of possible unused padding space in the on disk layout. */
3143 if (in_core
->al_offset
< 0) {
3144 if (in_core
->bm_offset
> in_core
->al_offset
)
3146 on_disk_al_sect
= -in_core
->al_offset
;
3147 on_disk_bm_sect
= in_core
->al_offset
- in_core
->bm_offset
;
3149 if (in_core
->al_offset
!= MD_4kB_SECT
)
3151 if (in_core
->bm_offset
< in_core
->al_offset
+ in_core
->al_size_4k
* MD_4kB_SECT
)
3154 on_disk_al_sect
= in_core
->bm_offset
- MD_4kB_SECT
;
3155 on_disk_bm_sect
= in_core
->md_size_sect
- in_core
->bm_offset
;
3158 /* old fixed size meta data is exactly that: fixed. */
3159 if (in_core
->meta_dev_idx
>= 0) {
3160 if (in_core
->md_size_sect
!= MD_128MB_SECT
3161 || in_core
->al_offset
!= MD_4kB_SECT
3162 || in_core
->bm_offset
!= MD_4kB_SECT
+ MD_32kB_SECT
3163 || in_core
->al_stripes
!= 1
3164 || in_core
->al_stripe_size_4k
!= MD_32kB_SECT
/8)
3168 if (capacity
< in_core
->md_size_sect
)
3170 if (capacity
- in_core
->md_size_sect
< drbd_md_first_sector(bdev
))
3173 /* should be aligned, and at least 32k */
3174 if ((on_disk_al_sect
& 7) || (on_disk_al_sect
< MD_32kB_SECT
))
3177 /* should fit (for now: exactly) into the available on-disk space;
3178 * overflow prevention is in check_activity_log_stripe_size() above. */
3179 if (on_disk_al_sect
!= in_core
->al_size_4k
* MD_4kB_SECT
)
3182 /* again, should be aligned */
3183 if (in_core
->bm_offset
& 7)
3186 /* FIXME check for device grow with flex external meta data? */
3188 /* can the available bitmap space cover the last agreed device size? */
3189 if (on_disk_bm_sect
< (in_core
->la_size_sect
+7)/MD_4kB_SECT
/8/512)
3195 drbd_err(device
, "meta data offsets don't make sense: idx=%d "
3196 "al_s=%u, al_sz4k=%u, al_offset=%d, bm_offset=%d, "
3197 "md_size_sect=%u, la_size=%llu, md_capacity=%llu\n",
3198 in_core
->meta_dev_idx
,
3199 in_core
->al_stripes
, in_core
->al_stripe_size_4k
,
3200 in_core
->al_offset
, in_core
->bm_offset
, in_core
->md_size_sect
,
3201 (unsigned long long)in_core
->la_size_sect
,
3202 (unsigned long long)capacity
);
3209 * drbd_md_read() - Reads in the meta data super block
3210 * @device: DRBD device.
3211 * @bdev: Device from which the meta data should be read in.
3213 * Return NO_ERROR on success, and an enum drbd_ret_code in case
3214 * something goes wrong.
3216 * Called exactly once during drbd_adm_attach(), while still being D_DISKLESS,
3217 * even before @bdev is assigned to @device->ldev.
3219 int drbd_md_read(struct drbd_device
*device
, struct drbd_backing_dev
*bdev
)
3221 struct meta_data_on_disk
*buffer
;
3223 int i
, rv
= NO_ERROR
;
3225 if (device
->state
.disk
!= D_DISKLESS
)
3226 return ERR_DISK_CONFIGURED
;
3228 buffer
= drbd_md_get_buffer(device
);
3232 /* First, figure out where our meta data superblock is located,
3234 bdev
->md
.meta_dev_idx
= bdev
->disk_conf
->meta_dev_idx
;
3235 bdev
->md
.md_offset
= drbd_md_ss(bdev
);
3237 if (drbd_md_sync_page_io(device
, bdev
, bdev
->md
.md_offset
, READ
)) {
3238 /* NOTE: can't do normal error processing here as this is
3239 called BEFORE disk is attached */
3240 drbd_err(device
, "Error while reading metadata.\n");
3241 rv
= ERR_IO_MD_DISK
;
3245 magic
= be32_to_cpu(buffer
->magic
);
3246 flags
= be32_to_cpu(buffer
->flags
);
3247 if (magic
== DRBD_MD_MAGIC_84_UNCLEAN
||
3248 (magic
== DRBD_MD_MAGIC_08
&& !(flags
& MDF_AL_CLEAN
))) {
3249 /* btw: that's Activity Log clean, not "all" clean. */
3250 drbd_err(device
, "Found unclean meta data. Did you \"drbdadm apply-al\"?\n");
3251 rv
= ERR_MD_UNCLEAN
;
3255 rv
= ERR_MD_INVALID
;
3256 if (magic
!= DRBD_MD_MAGIC_08
) {
3257 if (magic
== DRBD_MD_MAGIC_07
)
3258 drbd_err(device
, "Found old (0.7) meta data magic. Did you \"drbdadm create-md\"?\n");
3260 drbd_err(device
, "Meta data magic not found. Did you \"drbdadm create-md\"?\n");
3264 if (be32_to_cpu(buffer
->bm_bytes_per_bit
) != BM_BLOCK_SIZE
) {
3265 drbd_err(device
, "unexpected bm_bytes_per_bit: %u (expected %u)\n",
3266 be32_to_cpu(buffer
->bm_bytes_per_bit
), BM_BLOCK_SIZE
);
3271 /* convert to in_core endian */
3272 bdev
->md
.la_size_sect
= be64_to_cpu(buffer
->la_size_sect
);
3273 for (i
= UI_CURRENT
; i
< UI_SIZE
; i
++)
3274 bdev
->md
.uuid
[i
] = be64_to_cpu(buffer
->uuid
[i
]);
3275 bdev
->md
.flags
= be32_to_cpu(buffer
->flags
);
3276 bdev
->md
.device_uuid
= be64_to_cpu(buffer
->device_uuid
);
3278 bdev
->md
.md_size_sect
= be32_to_cpu(buffer
->md_size_sect
);
3279 bdev
->md
.al_offset
= be32_to_cpu(buffer
->al_offset
);
3280 bdev
->md
.bm_offset
= be32_to_cpu(buffer
->bm_offset
);
3282 if (check_activity_log_stripe_size(device
, buffer
, &bdev
->md
))
3284 if (check_offsets_and_sizes(device
, bdev
))
3287 if (be32_to_cpu(buffer
->bm_offset
) != bdev
->md
.bm_offset
) {
3288 drbd_err(device
, "unexpected bm_offset: %d (expected %d)\n",
3289 be32_to_cpu(buffer
->bm_offset
), bdev
->md
.bm_offset
);
3292 if (be32_to_cpu(buffer
->md_size_sect
) != bdev
->md
.md_size_sect
) {
3293 drbd_err(device
, "unexpected md_size: %u (expected %u)\n",
3294 be32_to_cpu(buffer
->md_size_sect
), bdev
->md
.md_size_sect
);
3300 spin_lock_irq(&device
->resource
->req_lock
);
3301 if (device
->state
.conn
< C_CONNECTED
) {
3303 peer
= be32_to_cpu(buffer
->la_peer_max_bio_size
);
3304 peer
= max(peer
, DRBD_MAX_BIO_SIZE_SAFE
);
3305 device
->peer_max_bio_size
= peer
;
3307 spin_unlock_irq(&device
->resource
->req_lock
);
3310 drbd_md_put_buffer(device
);
3316 * drbd_md_mark_dirty() - Mark meta data super block as dirty
3317 * @device: DRBD device.
3319 * Call this function if you change anything that should be written to
3320 * the meta-data super block. This function sets MD_DIRTY, and starts a
3321 * timer that ensures that within five seconds you have to call drbd_md_sync().
3324 void drbd_md_mark_dirty_(struct drbd_device
*device
, unsigned int line
, const char *func
)
3326 if (!test_and_set_bit(MD_DIRTY
, &device
->flags
)) {
3327 mod_timer(&device
->md_sync_timer
, jiffies
+ HZ
);
3328 device
->last_md_mark_dirty
.line
= line
;
3329 device
->last_md_mark_dirty
.func
= func
;
3333 void drbd_md_mark_dirty(struct drbd_device
*device
)
3335 if (!test_and_set_bit(MD_DIRTY
, &device
->flags
))
3336 mod_timer(&device
->md_sync_timer
, jiffies
+ 5*HZ
);
3340 void drbd_uuid_move_history(struct drbd_device
*device
) __must_hold(local
)
3344 for (i
= UI_HISTORY_START
; i
< UI_HISTORY_END
; i
++)
3345 device
->ldev
->md
.uuid
[i
+1] = device
->ldev
->md
.uuid
[i
];
3348 void __drbd_uuid_set(struct drbd_device
*device
, int idx
, u64 val
) __must_hold(local
)
3350 if (idx
== UI_CURRENT
) {
3351 if (device
->state
.role
== R_PRIMARY
)
3356 drbd_set_ed_uuid(device
, val
);
3359 device
->ldev
->md
.uuid
[idx
] = val
;
3360 drbd_md_mark_dirty(device
);
3363 void _drbd_uuid_set(struct drbd_device
*device
, int idx
, u64 val
) __must_hold(local
)
3365 unsigned long flags
;
3366 spin_lock_irqsave(&device
->ldev
->md
.uuid_lock
, flags
);
3367 __drbd_uuid_set(device
, idx
, val
);
3368 spin_unlock_irqrestore(&device
->ldev
->md
.uuid_lock
, flags
);
3371 void drbd_uuid_set(struct drbd_device
*device
, int idx
, u64 val
) __must_hold(local
)
3373 unsigned long flags
;
3374 spin_lock_irqsave(&device
->ldev
->md
.uuid_lock
, flags
);
3375 if (device
->ldev
->md
.uuid
[idx
]) {
3376 drbd_uuid_move_history(device
);
3377 device
->ldev
->md
.uuid
[UI_HISTORY_START
] = device
->ldev
->md
.uuid
[idx
];
3379 __drbd_uuid_set(device
, idx
, val
);
3380 spin_unlock_irqrestore(&device
->ldev
->md
.uuid_lock
, flags
);
3384 * drbd_uuid_new_current() - Creates a new current UUID
3385 * @device: DRBD device.
3387 * Creates a new current UUID, and rotates the old current UUID into
3388 * the bitmap slot. Causes an incremental resync upon next connect.
3390 void drbd_uuid_new_current(struct drbd_device
*device
) __must_hold(local
)
3393 unsigned long long bm_uuid
;
3395 get_random_bytes(&val
, sizeof(u64
));
3397 spin_lock_irq(&device
->ldev
->md
.uuid_lock
);
3398 bm_uuid
= device
->ldev
->md
.uuid
[UI_BITMAP
];
3401 drbd_warn(device
, "bm UUID was already set: %llX\n", bm_uuid
);
3403 device
->ldev
->md
.uuid
[UI_BITMAP
] = device
->ldev
->md
.uuid
[UI_CURRENT
];
3404 __drbd_uuid_set(device
, UI_CURRENT
, val
);
3405 spin_unlock_irq(&device
->ldev
->md
.uuid_lock
);
3407 drbd_print_uuids(device
, "new current UUID");
3408 /* get it to stable storage _now_ */
3409 drbd_md_sync(device
);
3412 void drbd_uuid_set_bm(struct drbd_device
*device
, u64 val
) __must_hold(local
)
3414 unsigned long flags
;
3415 if (device
->ldev
->md
.uuid
[UI_BITMAP
] == 0 && val
== 0)
3418 spin_lock_irqsave(&device
->ldev
->md
.uuid_lock
, flags
);
3420 drbd_uuid_move_history(device
);
3421 device
->ldev
->md
.uuid
[UI_HISTORY_START
] = device
->ldev
->md
.uuid
[UI_BITMAP
];
3422 device
->ldev
->md
.uuid
[UI_BITMAP
] = 0;
3424 unsigned long long bm_uuid
= device
->ldev
->md
.uuid
[UI_BITMAP
];
3426 drbd_warn(device
, "bm UUID was already set: %llX\n", bm_uuid
);
3428 device
->ldev
->md
.uuid
[UI_BITMAP
] = val
& ~((u64
)1);
3430 spin_unlock_irqrestore(&device
->ldev
->md
.uuid_lock
, flags
);
3432 drbd_md_mark_dirty(device
);
3436 * drbd_bmio_set_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
3437 * @device: DRBD device.
3439 * Sets all bits in the bitmap and writes the whole bitmap to stable storage.
3441 int drbd_bmio_set_n_write(struct drbd_device
*device
)
3445 if (get_ldev_if_state(device
, D_ATTACHING
)) {
3446 drbd_md_set_flag(device
, MDF_FULL_SYNC
);
3447 drbd_md_sync(device
);
3448 drbd_bm_set_all(device
);
3450 rv
= drbd_bm_write(device
);
3453 drbd_md_clear_flag(device
, MDF_FULL_SYNC
);
3454 drbd_md_sync(device
);
3464 * drbd_bmio_clear_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
3465 * @device: DRBD device.
3467 * Clears all bits in the bitmap and writes the whole bitmap to stable storage.
3469 int drbd_bmio_clear_n_write(struct drbd_device
*device
)
3473 drbd_resume_al(device
);
3474 if (get_ldev_if_state(device
, D_ATTACHING
)) {
3475 drbd_bm_clear_all(device
);
3476 rv
= drbd_bm_write(device
);
3483 static int w_bitmap_io(struct drbd_work
*w
, int unused
)
3485 struct bm_io_work
*work
= container_of(w
, struct bm_io_work
, w
);
3486 struct drbd_device
*device
= w
->device
;
3489 D_ASSERT(device
, atomic_read(&device
->ap_bio_cnt
) == 0);
3491 if (get_ldev(device
)) {
3492 drbd_bm_lock(device
, work
->why
, work
->flags
);
3493 rv
= work
->io_fn(device
);
3494 drbd_bm_unlock(device
);
3498 clear_bit_unlock(BITMAP_IO
, &device
->flags
);
3499 wake_up(&device
->misc_wait
);
3502 work
->done(device
, rv
);
3504 clear_bit(BITMAP_IO_QUEUED
, &device
->flags
);
3511 void drbd_ldev_destroy(struct drbd_device
*device
)
3513 lc_destroy(device
->resync
);
3514 device
->resync
= NULL
;
3515 lc_destroy(device
->act_log
);
3516 device
->act_log
= NULL
;
3518 drbd_free_bc(device
->ldev
);
3519 device
->ldev
= NULL
;);
3521 clear_bit(GO_DISKLESS
, &device
->flags
);
3524 static int w_go_diskless(struct drbd_work
*w
, int unused
)
3526 struct drbd_device
*device
= w
->device
;
3528 D_ASSERT(device
, device
->state
.disk
== D_FAILED
);
3529 /* we cannot assert local_cnt == 0 here, as get_ldev_if_state will
3530 * inc/dec it frequently. Once we are D_DISKLESS, no one will touch
3531 * the protected members anymore, though, so once put_ldev reaches zero
3532 * again, it will be safe to free them. */
3534 /* Try to write changed bitmap pages, read errors may have just
3535 * set some bits outside the area covered by the activity log.
3537 * If we have an IO error during the bitmap writeout,
3538 * we will want a full sync next time, just in case.
3539 * (Do we want a specific meta data flag for this?)
3541 * If that does not make it to stable storage either,
3542 * we cannot do anything about that anymore.
3544 * We still need to check if both bitmap and ldev are present, we may
3545 * end up here after a failed attach, before ldev was even assigned.
3547 if (device
->bitmap
&& device
->ldev
) {
3548 /* An interrupted resync or similar is allowed to recounts bits
3550 * Any modifications would not be expected anymore, though.
3552 if (drbd_bitmap_io_from_worker(device
, drbd_bm_write
,
3553 "detach", BM_LOCKED_TEST_ALLOWED
)) {
3554 if (test_bit(WAS_READ_ERROR
, &device
->flags
)) {
3555 drbd_md_set_flag(device
, MDF_FULL_SYNC
);
3556 drbd_md_sync(device
);
3561 drbd_force_state(device
, NS(disk
, D_DISKLESS
));
3566 * drbd_queue_bitmap_io() - Queues an IO operation on the whole bitmap
3567 * @device: DRBD device.
3568 * @io_fn: IO callback to be called when bitmap IO is possible
3569 * @done: callback to be called after the bitmap IO was performed
3570 * @why: Descriptive text of the reason for doing the IO
3572 * While IO on the bitmap happens we freeze application IO thus we ensure
3573 * that drbd_set_out_of_sync() can not be called. This function MAY ONLY be
3574 * called from worker context. It MUST NOT be used while a previous such
3575 * work is still pending!
3577 void drbd_queue_bitmap_io(struct drbd_device
*device
,
3578 int (*io_fn
)(struct drbd_device
*),
3579 void (*done
)(struct drbd_device
*, int),
3580 char *why
, enum bm_flag flags
)
3582 D_ASSERT(device
, current
== first_peer_device(device
)->connection
->worker
.task
);
3584 D_ASSERT(device
, !test_bit(BITMAP_IO_QUEUED
, &device
->flags
));
3585 D_ASSERT(device
, !test_bit(BITMAP_IO
, &device
->flags
));
3586 D_ASSERT(device
, list_empty(&device
->bm_io_work
.w
.list
));
3587 if (device
->bm_io_work
.why
)
3588 drbd_err(device
, "FIXME going to queue '%s' but '%s' still pending?\n",
3589 why
, device
->bm_io_work
.why
);
3591 device
->bm_io_work
.io_fn
= io_fn
;
3592 device
->bm_io_work
.done
= done
;
3593 device
->bm_io_work
.why
= why
;
3594 device
->bm_io_work
.flags
= flags
;
3596 spin_lock_irq(&device
->resource
->req_lock
);
3597 set_bit(BITMAP_IO
, &device
->flags
);
3598 if (atomic_read(&device
->ap_bio_cnt
) == 0) {
3599 if (!test_and_set_bit(BITMAP_IO_QUEUED
, &device
->flags
))
3600 drbd_queue_work(&first_peer_device(device
)->connection
->sender_work
, &device
->bm_io_work
.w
);
3602 spin_unlock_irq(&device
->resource
->req_lock
);
3606 * drbd_bitmap_io() - Does an IO operation on the whole bitmap
3607 * @device: DRBD device.
3608 * @io_fn: IO callback to be called when bitmap IO is possible
3609 * @why: Descriptive text of the reason for doing the IO
3611 * freezes application IO while that the actual IO operations runs. This
3612 * functions MAY NOT be called from worker context.
3614 int drbd_bitmap_io(struct drbd_device
*device
, int (*io_fn
)(struct drbd_device
*),
3615 char *why
, enum bm_flag flags
)
3619 D_ASSERT(device
, current
!= first_peer_device(device
)->connection
->worker
.task
);
3621 if ((flags
& BM_LOCKED_SET_ALLOWED
) == 0)
3622 drbd_suspend_io(device
);
3624 drbd_bm_lock(device
, why
, flags
);
3626 drbd_bm_unlock(device
);
3628 if ((flags
& BM_LOCKED_SET_ALLOWED
) == 0)
3629 drbd_resume_io(device
);
3634 void drbd_md_set_flag(struct drbd_device
*device
, int flag
) __must_hold(local
)
3636 if ((device
->ldev
->md
.flags
& flag
) != flag
) {
3637 drbd_md_mark_dirty(device
);
3638 device
->ldev
->md
.flags
|= flag
;
3642 void drbd_md_clear_flag(struct drbd_device
*device
, int flag
) __must_hold(local
)
3644 if ((device
->ldev
->md
.flags
& flag
) != 0) {
3645 drbd_md_mark_dirty(device
);
3646 device
->ldev
->md
.flags
&= ~flag
;
3649 int drbd_md_test_flag(struct drbd_backing_dev
*bdev
, int flag
)
3651 return (bdev
->md
.flags
& flag
) != 0;
3654 static void md_sync_timer_fn(unsigned long data
)
3656 struct drbd_device
*device
= (struct drbd_device
*) data
;
3658 /* must not double-queue! */
3659 if (list_empty(&device
->md_sync_work
.list
))
3660 drbd_queue_work_front(&first_peer_device(device
)->connection
->sender_work
, &device
->md_sync_work
);
3663 static int w_md_sync(struct drbd_work
*w
, int unused
)
3665 struct drbd_device
*device
= w
->device
;
3667 drbd_warn(device
, "md_sync_timer expired! Worker calls drbd_md_sync().\n");
3669 drbd_warn(device
, "last md_mark_dirty: %s:%u\n",
3670 device
->last_md_mark_dirty
.func
, device
->last_md_mark_dirty
.line
);
3672 drbd_md_sync(device
);
3676 const char *cmdname(enum drbd_packet cmd
)
3678 /* THINK may need to become several global tables
3679 * when we want to support more than
3680 * one PRO_VERSION */
3681 static const char *cmdnames
[] = {
3683 [P_DATA_REPLY
] = "DataReply",
3684 [P_RS_DATA_REPLY
] = "RSDataReply",
3685 [P_BARRIER
] = "Barrier",
3686 [P_BITMAP
] = "ReportBitMap",
3687 [P_BECOME_SYNC_TARGET
] = "BecomeSyncTarget",
3688 [P_BECOME_SYNC_SOURCE
] = "BecomeSyncSource",
3689 [P_UNPLUG_REMOTE
] = "UnplugRemote",
3690 [P_DATA_REQUEST
] = "DataRequest",
3691 [P_RS_DATA_REQUEST
] = "RSDataRequest",
3692 [P_SYNC_PARAM
] = "SyncParam",
3693 [P_SYNC_PARAM89
] = "SyncParam89",
3694 [P_PROTOCOL
] = "ReportProtocol",
3695 [P_UUIDS
] = "ReportUUIDs",
3696 [P_SIZES
] = "ReportSizes",
3697 [P_STATE
] = "ReportState",
3698 [P_SYNC_UUID
] = "ReportSyncUUID",
3699 [P_AUTH_CHALLENGE
] = "AuthChallenge",
3700 [P_AUTH_RESPONSE
] = "AuthResponse",
3702 [P_PING_ACK
] = "PingAck",
3703 [P_RECV_ACK
] = "RecvAck",
3704 [P_WRITE_ACK
] = "WriteAck",
3705 [P_RS_WRITE_ACK
] = "RSWriteAck",
3706 [P_SUPERSEDED
] = "Superseded",
3707 [P_NEG_ACK
] = "NegAck",
3708 [P_NEG_DREPLY
] = "NegDReply",
3709 [P_NEG_RS_DREPLY
] = "NegRSDReply",
3710 [P_BARRIER_ACK
] = "BarrierAck",
3711 [P_STATE_CHG_REQ
] = "StateChgRequest",
3712 [P_STATE_CHG_REPLY
] = "StateChgReply",
3713 [P_OV_REQUEST
] = "OVRequest",
3714 [P_OV_REPLY
] = "OVReply",
3715 [P_OV_RESULT
] = "OVResult",
3716 [P_CSUM_RS_REQUEST
] = "CsumRSRequest",
3717 [P_RS_IS_IN_SYNC
] = "CsumRSIsInSync",
3718 [P_COMPRESSED_BITMAP
] = "CBitmap",
3719 [P_DELAY_PROBE
] = "DelayProbe",
3720 [P_OUT_OF_SYNC
] = "OutOfSync",
3721 [P_RETRY_WRITE
] = "RetryWrite",
3722 [P_RS_CANCEL
] = "RSCancel",
3723 [P_CONN_ST_CHG_REQ
] = "conn_st_chg_req",
3724 [P_CONN_ST_CHG_REPLY
] = "conn_st_chg_reply",
3725 [P_RETRY_WRITE
] = "retry_write",
3726 [P_PROTOCOL_UPDATE
] = "protocol_update",
3728 /* enum drbd_packet, but not commands - obsoleted flags:
3734 /* too big for the array: 0xfffX */
3735 if (cmd
== P_INITIAL_META
)
3736 return "InitialMeta";
3737 if (cmd
== P_INITIAL_DATA
)
3738 return "InitialData";
3739 if (cmd
== P_CONNECTION_FEATURES
)
3740 return "ConnectionFeatures";
3741 if (cmd
>= ARRAY_SIZE(cmdnames
))
3743 return cmdnames
[cmd
];
3747 * drbd_wait_misc - wait for a request to make progress
3748 * @device: device associated with the request
3749 * @i: the struct drbd_interval embedded in struct drbd_request or
3750 * struct drbd_peer_request
3752 int drbd_wait_misc(struct drbd_device
*device
, struct drbd_interval
*i
)
3754 struct net_conf
*nc
;
3759 nc
= rcu_dereference(first_peer_device(device
)->connection
->net_conf
);
3764 timeout
= nc
->ko_count
? nc
->timeout
* HZ
/ 10 * nc
->ko_count
: MAX_SCHEDULE_TIMEOUT
;
3767 /* Indicate to wake up device->misc_wait on progress. */
3769 prepare_to_wait(&device
->misc_wait
, &wait
, TASK_INTERRUPTIBLE
);
3770 spin_unlock_irq(&device
->resource
->req_lock
);
3771 timeout
= schedule_timeout(timeout
);
3772 finish_wait(&device
->misc_wait
, &wait
);
3773 spin_lock_irq(&device
->resource
->req_lock
);
3774 if (!timeout
|| device
->state
.conn
< C_CONNECTED
)
3776 if (signal_pending(current
))
3777 return -ERESTARTSYS
;
3781 #ifdef CONFIG_DRBD_FAULT_INJECTION
3782 /* Fault insertion support including random number generator shamelessly
3783 * stolen from kernel/rcutorture.c */
3784 struct fault_random_state
{
3785 unsigned long state
;
3786 unsigned long count
;
3789 #define FAULT_RANDOM_MULT 39916801 /* prime */
3790 #define FAULT_RANDOM_ADD 479001701 /* prime */
3791 #define FAULT_RANDOM_REFRESH 10000
3794 * Crude but fast random-number generator. Uses a linear congruential
3795 * generator, with occasional help from get_random_bytes().
3797 static unsigned long
3798 _drbd_fault_random(struct fault_random_state
*rsp
)
3802 if (!rsp
->count
--) {
3803 get_random_bytes(&refresh
, sizeof(refresh
));
3804 rsp
->state
+= refresh
;
3805 rsp
->count
= FAULT_RANDOM_REFRESH
;
3807 rsp
->state
= rsp
->state
* FAULT_RANDOM_MULT
+ FAULT_RANDOM_ADD
;
3808 return swahw32(rsp
->state
);
3812 _drbd_fault_str(unsigned int type
) {
3813 static char *_faults
[] = {
3814 [DRBD_FAULT_MD_WR
] = "Meta-data write",
3815 [DRBD_FAULT_MD_RD
] = "Meta-data read",
3816 [DRBD_FAULT_RS_WR
] = "Resync write",
3817 [DRBD_FAULT_RS_RD
] = "Resync read",
3818 [DRBD_FAULT_DT_WR
] = "Data write",
3819 [DRBD_FAULT_DT_RD
] = "Data read",
3820 [DRBD_FAULT_DT_RA
] = "Data read ahead",
3821 [DRBD_FAULT_BM_ALLOC
] = "BM allocation",
3822 [DRBD_FAULT_AL_EE
] = "EE allocation",
3823 [DRBD_FAULT_RECEIVE
] = "receive data corruption",
3826 return (type
< DRBD_FAULT_MAX
) ? _faults
[type
] : "**Unknown**";
3830 _drbd_insert_fault(struct drbd_device
*device
, unsigned int type
)
3832 static struct fault_random_state rrs
= {0, 0};
3834 unsigned int ret
= (
3836 ((1 << device_to_minor(device
)) & fault_devs
) != 0) &&
3837 (((_drbd_fault_random(&rrs
) % 100) + 1) <= fault_rate
));
3842 if (__ratelimit(&drbd_ratelimit_state
))
3843 drbd_warn(device
, "***Simulating %s failure\n",
3844 _drbd_fault_str(type
));
3851 const char *drbd_buildtag(void)
3853 /* DRBD built from external sources has here a reference to the
3854 git hash of the source code. */
3856 static char buildtag
[38] = "\0uilt-in";
3858 if (buildtag
[0] == 0) {
3860 sprintf(buildtag
, "srcversion: %-24s", THIS_MODULE
->srcversion
);
3869 module_init(drbd_init
)
3870 module_exit(drbd_cleanup
)
3872 EXPORT_SYMBOL(drbd_conn_str
);
3873 EXPORT_SYMBOL(drbd_role_str
);
3874 EXPORT_SYMBOL(drbd_disk_str
);
3875 EXPORT_SYMBOL(drbd_set_st_err_str
);