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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
31 #include <linux/module.h>
32 #include <linux/jiffies.h>
33 #include <linux/drbd.h>
34 #include <asm/uaccess.h>
35 #include <asm/types.h>
37 #include <linux/ctype.h>
38 #include <linux/mutex.h>
40 #include <linux/file.h>
41 #include <linux/proc_fs.h>
42 #include <linux/init.h>
44 #include <linux/memcontrol.h>
45 #include <linux/mm_inline.h>
46 #include <linux/slab.h>
47 #include <linux/random.h>
48 #include <linux/reboot.h>
49 #include <linux/notifier.h>
50 #include <linux/kthread.h>
51 #include <linux/workqueue.h>
52 #define __KERNEL_SYSCALLS__
53 #include <linux/unistd.h>
54 #include <linux/vmalloc.h>
56 #include <linux/drbd_limits.h>
58 #include "drbd_protocol.h"
59 #include "drbd_req.h" /* only for _req_mod in tl_release and tl_clear */
61 #include "drbd_debugfs.h"
63 static DEFINE_MUTEX(drbd_main_mutex
);
64 static int drbd_open(struct block_device
*bdev
, fmode_t mode
);
65 static void drbd_release(struct gendisk
*gd
, fmode_t mode
);
66 static void md_sync_timer_fn(unsigned long data
);
67 static int w_bitmap_io(struct drbd_work
*w
, int unused
);
69 MODULE_AUTHOR("Philipp Reisner <phil@linbit.com>, "
70 "Lars Ellenberg <lars@linbit.com>");
71 MODULE_DESCRIPTION("drbd - Distributed Replicated Block Device v" REL_VERSION
);
72 MODULE_VERSION(REL_VERSION
);
73 MODULE_LICENSE("GPL");
74 MODULE_PARM_DESC(minor_count
, "Approximate number of drbd devices ("
75 __stringify(DRBD_MINOR_COUNT_MIN
) "-" __stringify(DRBD_MINOR_COUNT_MAX
) ")");
76 MODULE_ALIAS_BLOCKDEV_MAJOR(DRBD_MAJOR
);
78 #include <linux/moduleparam.h>
79 /* allow_open_on_secondary */
80 MODULE_PARM_DESC(allow_oos
, "DONT USE!");
81 /* thanks to these macros, if compiled into the kernel (not-module),
82 * this becomes the boot parameter drbd.minor_count */
83 module_param(minor_count
, uint
, 0444);
84 module_param(disable_sendpage
, bool, 0644);
85 module_param(allow_oos
, bool, 0);
86 module_param(proc_details
, int, 0644);
88 #ifdef CONFIG_DRBD_FAULT_INJECTION
91 static int fault_count
;
93 /* bitmap of enabled faults */
94 module_param(enable_faults
, int, 0664);
95 /* fault rate % value - applies to all enabled faults */
96 module_param(fault_rate
, int, 0664);
97 /* count of faults inserted */
98 module_param(fault_count
, int, 0664);
99 /* bitmap of devices to insert faults on */
100 module_param(fault_devs
, int, 0644);
103 /* module parameter, defined */
104 unsigned int minor_count
= DRBD_MINOR_COUNT_DEF
;
105 bool disable_sendpage
;
107 int proc_details
; /* Detail level in proc drbd*/
109 /* Module parameter for setting the user mode helper program
110 * to run. Default is /sbin/drbdadm */
111 char usermode_helper
[80] = "/sbin/drbdadm";
113 module_param_string(usermode_helper
, usermode_helper
, sizeof(usermode_helper
), 0644);
115 /* in 2.6.x, our device mapping and config info contains our virtual gendisks
116 * as member "struct gendisk *vdisk;"
118 struct idr drbd_devices
;
119 struct list_head drbd_resources
;
120 struct mutex resources_mutex
;
122 struct kmem_cache
*drbd_request_cache
;
123 struct kmem_cache
*drbd_ee_cache
; /* peer requests */
124 struct kmem_cache
*drbd_bm_ext_cache
; /* bitmap extents */
125 struct kmem_cache
*drbd_al_ext_cache
; /* activity log extents */
126 mempool_t
*drbd_request_mempool
;
127 mempool_t
*drbd_ee_mempool
;
128 mempool_t
*drbd_md_io_page_pool
;
129 struct bio_set
*drbd_md_io_bio_set
;
131 /* I do not use a standard mempool, because:
132 1) I want to hand out the pre-allocated objects first.
133 2) I want to be able to interrupt sleeping allocation with a signal.
134 Note: This is a single linked list, the next pointer is the private
135 member of struct page.
137 struct page
*drbd_pp_pool
;
138 spinlock_t drbd_pp_lock
;
140 wait_queue_head_t drbd_pp_wait
;
142 DEFINE_RATELIMIT_STATE(drbd_ratelimit_state
, 5 * HZ
, 5);
144 static const struct block_device_operations drbd_ops
= {
145 .owner
= THIS_MODULE
,
147 .release
= drbd_release
,
150 struct bio
*bio_alloc_drbd(gfp_t gfp_mask
)
154 if (!drbd_md_io_bio_set
)
155 return bio_alloc(gfp_mask
, 1);
157 bio
= bio_alloc_bioset(gfp_mask
, 1, drbd_md_io_bio_set
);
164 /* When checking with sparse, and this is an inline function, sparse will
165 give tons of false positives. When this is a real functions sparse works.
167 int _get_ldev_if_state(struct drbd_device
*device
, enum drbd_disk_state mins
)
171 atomic_inc(&device
->local_cnt
);
172 io_allowed
= (device
->state
.disk
>= mins
);
174 if (atomic_dec_and_test(&device
->local_cnt
))
175 wake_up(&device
->misc_wait
);
183 * tl_release() - mark as BARRIER_ACKED all requests in the corresponding transfer log epoch
184 * @connection: DRBD connection.
185 * @barrier_nr: Expected identifier of the DRBD write barrier packet.
186 * @set_size: Expected number of requests before that barrier.
188 * In case the passed barrier_nr or set_size does not match the oldest
189 * epoch of not yet barrier-acked requests, this function will cause a
190 * termination of the connection.
192 void tl_release(struct drbd_connection
*connection
, unsigned int barrier_nr
,
193 unsigned int set_size
)
195 struct drbd_request
*r
;
196 struct drbd_request
*req
= NULL
;
197 int expect_epoch
= 0;
200 spin_lock_irq(&connection
->resource
->req_lock
);
202 /* find oldest not yet barrier-acked write request,
203 * count writes in its epoch. */
204 list_for_each_entry(r
, &connection
->transfer_log
, tl_requests
) {
205 const unsigned s
= r
->rq_state
;
209 if (!(s
& RQ_NET_MASK
))
214 expect_epoch
= req
->epoch
;
217 if (r
->epoch
!= expect_epoch
)
221 /* if (s & RQ_DONE): not expected */
222 /* if (!(s & RQ_NET_MASK)): not expected */
227 /* first some paranoia code */
229 drbd_err(connection
, "BAD! BarrierAck #%u received, but no epoch in tl!?\n",
233 if (expect_epoch
!= barrier_nr
) {
234 drbd_err(connection
, "BAD! BarrierAck #%u received, expected #%u!\n",
235 barrier_nr
, expect_epoch
);
239 if (expect_size
!= set_size
) {
240 drbd_err(connection
, "BAD! BarrierAck #%u received with n_writes=%u, expected n_writes=%u!\n",
241 barrier_nr
, set_size
, expect_size
);
245 /* Clean up list of requests processed during current epoch. */
246 /* this extra list walk restart is paranoia,
247 * to catch requests being barrier-acked "unexpectedly".
248 * It usually should find the same req again, or some READ preceding it. */
249 list_for_each_entry(req
, &connection
->transfer_log
, tl_requests
)
250 if (req
->epoch
== expect_epoch
)
252 list_for_each_entry_safe_from(req
, r
, &connection
->transfer_log
, tl_requests
) {
253 if (req
->epoch
!= expect_epoch
)
255 _req_mod(req
, BARRIER_ACKED
);
257 spin_unlock_irq(&connection
->resource
->req_lock
);
262 spin_unlock_irq(&connection
->resource
->req_lock
);
263 conn_request_state(connection
, NS(conn
, C_PROTOCOL_ERROR
), CS_HARD
);
268 * _tl_restart() - Walks the transfer log, and applies an action to all requests
269 * @connection: DRBD connection to operate on.
270 * @what: The action/event to perform with all request objects
272 * @what might be one of CONNECTION_LOST_WHILE_PENDING, RESEND, FAIL_FROZEN_DISK_IO,
273 * RESTART_FROZEN_DISK_IO.
275 /* must hold resource->req_lock */
276 void _tl_restart(struct drbd_connection
*connection
, enum drbd_req_event what
)
278 struct drbd_request
*req
, *r
;
280 list_for_each_entry_safe(req
, r
, &connection
->transfer_log
, tl_requests
)
284 void tl_restart(struct drbd_connection
*connection
, enum drbd_req_event what
)
286 spin_lock_irq(&connection
->resource
->req_lock
);
287 _tl_restart(connection
, what
);
288 spin_unlock_irq(&connection
->resource
->req_lock
);
292 * tl_clear() - Clears all requests and &struct drbd_tl_epoch objects out of the TL
293 * @device: DRBD device.
295 * This is called after the connection to the peer was lost. The storage covered
296 * by the requests on the transfer gets marked as our of sync. Called from the
297 * receiver thread and the worker thread.
299 void tl_clear(struct drbd_connection
*connection
)
301 tl_restart(connection
, CONNECTION_LOST_WHILE_PENDING
);
305 * tl_abort_disk_io() - Abort disk I/O for all requests for a certain device in the TL
306 * @device: DRBD device.
308 void tl_abort_disk_io(struct drbd_device
*device
)
310 struct drbd_connection
*connection
= first_peer_device(device
)->connection
;
311 struct drbd_request
*req
, *r
;
313 spin_lock_irq(&connection
->resource
->req_lock
);
314 list_for_each_entry_safe(req
, r
, &connection
->transfer_log
, tl_requests
) {
315 if (!(req
->rq_state
& RQ_LOCAL_PENDING
))
317 if (req
->device
!= device
)
319 _req_mod(req
, ABORT_DISK_IO
);
321 spin_unlock_irq(&connection
->resource
->req_lock
);
324 static int drbd_thread_setup(void *arg
)
326 struct drbd_thread
*thi
= (struct drbd_thread
*) arg
;
327 struct drbd_resource
*resource
= thi
->resource
;
331 snprintf(current
->comm
, sizeof(current
->comm
), "drbd_%c_%s",
336 retval
= thi
->function(thi
);
338 spin_lock_irqsave(&thi
->t_lock
, flags
);
340 /* if the receiver has been "EXITING", the last thing it did
341 * was set the conn state to "StandAlone",
342 * if now a re-connect request comes in, conn state goes C_UNCONNECTED,
343 * and receiver thread will be "started".
344 * drbd_thread_start needs to set "RESTARTING" in that case.
345 * t_state check and assignment needs to be within the same spinlock,
346 * so either thread_start sees EXITING, and can remap to RESTARTING,
347 * or thread_start see NONE, and can proceed as normal.
350 if (thi
->t_state
== RESTARTING
) {
351 drbd_info(resource
, "Restarting %s thread\n", thi
->name
);
352 thi
->t_state
= RUNNING
;
353 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
360 complete_all(&thi
->stop
);
361 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
363 drbd_info(resource
, "Terminating %s\n", current
->comm
);
365 /* Release mod reference taken when thread was started */
368 kref_put(&thi
->connection
->kref
, drbd_destroy_connection
);
369 kref_put(&resource
->kref
, drbd_destroy_resource
);
370 module_put(THIS_MODULE
);
374 static void drbd_thread_init(struct drbd_resource
*resource
, struct drbd_thread
*thi
,
375 int (*func
) (struct drbd_thread
*), const char *name
)
377 spin_lock_init(&thi
->t_lock
);
380 thi
->function
= func
;
381 thi
->resource
= resource
;
382 thi
->connection
= NULL
;
386 int drbd_thread_start(struct drbd_thread
*thi
)
388 struct drbd_resource
*resource
= thi
->resource
;
389 struct task_struct
*nt
;
392 /* is used from state engine doing drbd_thread_stop_nowait,
393 * while holding the req lock irqsave */
394 spin_lock_irqsave(&thi
->t_lock
, flags
);
396 switch (thi
->t_state
) {
398 drbd_info(resource
, "Starting %s thread (from %s [%d])\n",
399 thi
->name
, current
->comm
, current
->pid
);
401 /* Get ref on module for thread - this is released when thread exits */
402 if (!try_module_get(THIS_MODULE
)) {
403 drbd_err(resource
, "Failed to get module reference in drbd_thread_start\n");
404 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
408 kref_get(&resource
->kref
);
410 kref_get(&thi
->connection
->kref
);
412 init_completion(&thi
->stop
);
413 thi
->reset_cpu_mask
= 1;
414 thi
->t_state
= RUNNING
;
415 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
416 flush_signals(current
); /* otherw. may get -ERESTARTNOINTR */
418 nt
= kthread_create(drbd_thread_setup
, (void *) thi
,
419 "drbd_%c_%s", thi
->name
[0], thi
->resource
->name
);
422 drbd_err(resource
, "Couldn't start thread\n");
425 kref_put(&thi
->connection
->kref
, drbd_destroy_connection
);
426 kref_put(&resource
->kref
, drbd_destroy_resource
);
427 module_put(THIS_MODULE
);
430 spin_lock_irqsave(&thi
->t_lock
, flags
);
432 thi
->t_state
= RUNNING
;
433 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
437 thi
->t_state
= RESTARTING
;
438 drbd_info(resource
, "Restarting %s thread (from %s [%d])\n",
439 thi
->name
, current
->comm
, current
->pid
);
444 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
452 void _drbd_thread_stop(struct drbd_thread
*thi
, int restart
, int wait
)
456 enum drbd_thread_state ns
= restart
? RESTARTING
: EXITING
;
458 /* may be called from state engine, holding the req lock irqsave */
459 spin_lock_irqsave(&thi
->t_lock
, flags
);
461 if (thi
->t_state
== NONE
) {
462 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
464 drbd_thread_start(thi
);
468 if (thi
->t_state
!= ns
) {
469 if (thi
->task
== NULL
) {
470 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
476 init_completion(&thi
->stop
);
477 if (thi
->task
!= current
)
478 force_sig(DRBD_SIGKILL
, thi
->task
);
481 spin_unlock_irqrestore(&thi
->t_lock
, flags
);
484 wait_for_completion(&thi
->stop
);
487 int conn_lowest_minor(struct drbd_connection
*connection
)
489 struct drbd_peer_device
*peer_device
;
490 int vnr
= 0, minor
= -1;
493 peer_device
= idr_get_next(&connection
->peer_devices
, &vnr
);
495 minor
= device_to_minor(peer_device
->device
);
503 * drbd_calc_cpu_mask() - Generate CPU masks, spread over all CPUs
505 * Forces all threads of a resource onto the same CPU. This is beneficial for
506 * DRBD's performance. May be overwritten by user's configuration.
508 static void drbd_calc_cpu_mask(cpumask_var_t
*cpu_mask
)
510 unsigned int *resources_per_cpu
, min_index
= ~0;
512 resources_per_cpu
= kzalloc(nr_cpu_ids
* sizeof(*resources_per_cpu
), GFP_KERNEL
);
513 if (resources_per_cpu
) {
514 struct drbd_resource
*resource
;
515 unsigned int cpu
, min
= ~0;
518 for_each_resource_rcu(resource
, &drbd_resources
) {
519 for_each_cpu(cpu
, resource
->cpu_mask
)
520 resources_per_cpu
[cpu
]++;
523 for_each_online_cpu(cpu
) {
524 if (resources_per_cpu
[cpu
] < min
) {
525 min
= resources_per_cpu
[cpu
];
529 kfree(resources_per_cpu
);
531 if (min_index
== ~0) {
532 cpumask_setall(*cpu_mask
);
535 cpumask_set_cpu(min_index
, *cpu_mask
);
539 * drbd_thread_current_set_cpu() - modifies the cpu mask of the _current_ thread
540 * @device: DRBD device.
541 * @thi: drbd_thread object
543 * call in the "main loop" of _all_ threads, no need for any mutex, current won't die
546 void drbd_thread_current_set_cpu(struct drbd_thread
*thi
)
548 struct drbd_resource
*resource
= thi
->resource
;
549 struct task_struct
*p
= current
;
551 if (!thi
->reset_cpu_mask
)
553 thi
->reset_cpu_mask
= 0;
554 set_cpus_allowed_ptr(p
, resource
->cpu_mask
);
557 #define drbd_calc_cpu_mask(A) ({})
561 * drbd_header_size - size of a packet header
563 * The header size is a multiple of 8, so any payload following the header is
564 * word aligned on 64-bit architectures. (The bitmap send and receive code
567 unsigned int drbd_header_size(struct drbd_connection
*connection
)
569 if (connection
->agreed_pro_version
>= 100) {
570 BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header100
), 8));
571 return sizeof(struct p_header100
);
573 BUILD_BUG_ON(sizeof(struct p_header80
) !=
574 sizeof(struct p_header95
));
575 BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header80
), 8));
576 return sizeof(struct p_header80
);
580 static unsigned int prepare_header80(struct p_header80
*h
, enum drbd_packet cmd
, int size
)
582 h
->magic
= cpu_to_be32(DRBD_MAGIC
);
583 h
->command
= cpu_to_be16(cmd
);
584 h
->length
= cpu_to_be16(size
);
585 return sizeof(struct p_header80
);
588 static unsigned int prepare_header95(struct p_header95
*h
, enum drbd_packet cmd
, int size
)
590 h
->magic
= cpu_to_be16(DRBD_MAGIC_BIG
);
591 h
->command
= cpu_to_be16(cmd
);
592 h
->length
= cpu_to_be32(size
);
593 return sizeof(struct p_header95
);
596 static unsigned int prepare_header100(struct p_header100
*h
, enum drbd_packet cmd
,
599 h
->magic
= cpu_to_be32(DRBD_MAGIC_100
);
600 h
->volume
= cpu_to_be16(vnr
);
601 h
->command
= cpu_to_be16(cmd
);
602 h
->length
= cpu_to_be32(size
);
604 return sizeof(struct p_header100
);
607 static unsigned int prepare_header(struct drbd_connection
*connection
, int vnr
,
608 void *buffer
, enum drbd_packet cmd
, int size
)
610 if (connection
->agreed_pro_version
>= 100)
611 return prepare_header100(buffer
, cmd
, size
, vnr
);
612 else if (connection
->agreed_pro_version
>= 95 &&
613 size
> DRBD_MAX_SIZE_H80_PACKET
)
614 return prepare_header95(buffer
, cmd
, size
);
616 return prepare_header80(buffer
, cmd
, size
);
619 static void *__conn_prepare_command(struct drbd_connection
*connection
,
620 struct drbd_socket
*sock
)
624 return sock
->sbuf
+ drbd_header_size(connection
);
627 void *conn_prepare_command(struct drbd_connection
*connection
, struct drbd_socket
*sock
)
631 mutex_lock(&sock
->mutex
);
632 p
= __conn_prepare_command(connection
, sock
);
634 mutex_unlock(&sock
->mutex
);
639 void *drbd_prepare_command(struct drbd_peer_device
*peer_device
, struct drbd_socket
*sock
)
641 return conn_prepare_command(peer_device
->connection
, sock
);
644 static int __send_command(struct drbd_connection
*connection
, int vnr
,
645 struct drbd_socket
*sock
, enum drbd_packet cmd
,
646 unsigned int header_size
, void *data
,
653 * Called with @data == NULL and the size of the data blocks in @size
654 * for commands that send data blocks. For those commands, omit the
655 * MSG_MORE flag: this will increase the likelihood that data blocks
656 * which are page aligned on the sender will end up page aligned on the
659 msg_flags
= data
? MSG_MORE
: 0;
661 header_size
+= prepare_header(connection
, vnr
, sock
->sbuf
, cmd
,
663 err
= drbd_send_all(connection
, sock
->socket
, sock
->sbuf
, header_size
,
666 err
= drbd_send_all(connection
, sock
->socket
, data
, size
, 0);
667 /* DRBD protocol "pings" are latency critical.
668 * This is supposed to trigger tcp_push_pending_frames() */
669 if (!err
&& (cmd
== P_PING
|| cmd
== P_PING_ACK
))
670 drbd_tcp_nodelay(sock
->socket
);
675 static int __conn_send_command(struct drbd_connection
*connection
, struct drbd_socket
*sock
,
676 enum drbd_packet cmd
, unsigned int header_size
,
677 void *data
, unsigned int size
)
679 return __send_command(connection
, 0, sock
, cmd
, header_size
, data
, size
);
682 int conn_send_command(struct drbd_connection
*connection
, struct drbd_socket
*sock
,
683 enum drbd_packet cmd
, unsigned int header_size
,
684 void *data
, unsigned int size
)
688 err
= __conn_send_command(connection
, sock
, cmd
, header_size
, data
, size
);
689 mutex_unlock(&sock
->mutex
);
693 int drbd_send_command(struct drbd_peer_device
*peer_device
, struct drbd_socket
*sock
,
694 enum drbd_packet cmd
, unsigned int header_size
,
695 void *data
, unsigned int size
)
699 err
= __send_command(peer_device
->connection
, peer_device
->device
->vnr
,
700 sock
, cmd
, header_size
, data
, size
);
701 mutex_unlock(&sock
->mutex
);
705 int drbd_send_ping(struct drbd_connection
*connection
)
707 struct drbd_socket
*sock
;
709 sock
= &connection
->meta
;
710 if (!conn_prepare_command(connection
, sock
))
712 return conn_send_command(connection
, sock
, P_PING
, 0, NULL
, 0);
715 int drbd_send_ping_ack(struct drbd_connection
*connection
)
717 struct drbd_socket
*sock
;
719 sock
= &connection
->meta
;
720 if (!conn_prepare_command(connection
, sock
))
722 return conn_send_command(connection
, sock
, P_PING_ACK
, 0, NULL
, 0);
725 int drbd_send_sync_param(struct drbd_peer_device
*peer_device
)
727 struct drbd_socket
*sock
;
728 struct p_rs_param_95
*p
;
730 const int apv
= peer_device
->connection
->agreed_pro_version
;
731 enum drbd_packet cmd
;
733 struct disk_conf
*dc
;
735 sock
= &peer_device
->connection
->data
;
736 p
= drbd_prepare_command(peer_device
, sock
);
741 nc
= rcu_dereference(peer_device
->connection
->net_conf
);
743 size
= apv
<= 87 ? sizeof(struct p_rs_param
)
744 : apv
== 88 ? sizeof(struct p_rs_param
)
745 + strlen(nc
->verify_alg
) + 1
746 : apv
<= 94 ? sizeof(struct p_rs_param_89
)
747 : /* apv >= 95 */ sizeof(struct p_rs_param_95
);
749 cmd
= apv
>= 89 ? P_SYNC_PARAM89
: P_SYNC_PARAM
;
751 /* initialize verify_alg and csums_alg */
752 memset(p
->verify_alg
, 0, 2 * SHARED_SECRET_MAX
);
754 if (get_ldev(peer_device
->device
)) {
755 dc
= rcu_dereference(peer_device
->device
->ldev
->disk_conf
);
756 p
->resync_rate
= cpu_to_be32(dc
->resync_rate
);
757 p
->c_plan_ahead
= cpu_to_be32(dc
->c_plan_ahead
);
758 p
->c_delay_target
= cpu_to_be32(dc
->c_delay_target
);
759 p
->c_fill_target
= cpu_to_be32(dc
->c_fill_target
);
760 p
->c_max_rate
= cpu_to_be32(dc
->c_max_rate
);
761 put_ldev(peer_device
->device
);
763 p
->resync_rate
= cpu_to_be32(DRBD_RESYNC_RATE_DEF
);
764 p
->c_plan_ahead
= cpu_to_be32(DRBD_C_PLAN_AHEAD_DEF
);
765 p
->c_delay_target
= cpu_to_be32(DRBD_C_DELAY_TARGET_DEF
);
766 p
->c_fill_target
= cpu_to_be32(DRBD_C_FILL_TARGET_DEF
);
767 p
->c_max_rate
= cpu_to_be32(DRBD_C_MAX_RATE_DEF
);
771 strcpy(p
->verify_alg
, nc
->verify_alg
);
773 strcpy(p
->csums_alg
, nc
->csums_alg
);
776 return drbd_send_command(peer_device
, sock
, cmd
, size
, NULL
, 0);
779 int __drbd_send_protocol(struct drbd_connection
*connection
, enum drbd_packet cmd
)
781 struct drbd_socket
*sock
;
782 struct p_protocol
*p
;
786 sock
= &connection
->data
;
787 p
= __conn_prepare_command(connection
, sock
);
792 nc
= rcu_dereference(connection
->net_conf
);
794 if (nc
->tentative
&& connection
->agreed_pro_version
< 92) {
796 mutex_unlock(&sock
->mutex
);
797 drbd_err(connection
, "--dry-run is not supported by peer");
802 if (connection
->agreed_pro_version
>= 87)
803 size
+= strlen(nc
->integrity_alg
) + 1;
805 p
->protocol
= cpu_to_be32(nc
->wire_protocol
);
806 p
->after_sb_0p
= cpu_to_be32(nc
->after_sb_0p
);
807 p
->after_sb_1p
= cpu_to_be32(nc
->after_sb_1p
);
808 p
->after_sb_2p
= cpu_to_be32(nc
->after_sb_2p
);
809 p
->two_primaries
= cpu_to_be32(nc
->two_primaries
);
811 if (nc
->discard_my_data
)
812 cf
|= CF_DISCARD_MY_DATA
;
815 p
->conn_flags
= cpu_to_be32(cf
);
817 if (connection
->agreed_pro_version
>= 87)
818 strcpy(p
->integrity_alg
, nc
->integrity_alg
);
821 return __conn_send_command(connection
, sock
, cmd
, size
, NULL
, 0);
824 int drbd_send_protocol(struct drbd_connection
*connection
)
828 mutex_lock(&connection
->data
.mutex
);
829 err
= __drbd_send_protocol(connection
, P_PROTOCOL
);
830 mutex_unlock(&connection
->data
.mutex
);
835 static int _drbd_send_uuids(struct drbd_peer_device
*peer_device
, u64 uuid_flags
)
837 struct drbd_device
*device
= peer_device
->device
;
838 struct drbd_socket
*sock
;
842 if (!get_ldev_if_state(device
, D_NEGOTIATING
))
845 sock
= &peer_device
->connection
->data
;
846 p
= drbd_prepare_command(peer_device
, sock
);
851 spin_lock_irq(&device
->ldev
->md
.uuid_lock
);
852 for (i
= UI_CURRENT
; i
< UI_SIZE
; i
++)
853 p
->uuid
[i
] = cpu_to_be64(device
->ldev
->md
.uuid
[i
]);
854 spin_unlock_irq(&device
->ldev
->md
.uuid_lock
);
856 device
->comm_bm_set
= drbd_bm_total_weight(device
);
857 p
->uuid
[UI_SIZE
] = cpu_to_be64(device
->comm_bm_set
);
859 uuid_flags
|= rcu_dereference(peer_device
->connection
->net_conf
)->discard_my_data
? 1 : 0;
861 uuid_flags
|= test_bit(CRASHED_PRIMARY
, &device
->flags
) ? 2 : 0;
862 uuid_flags
|= device
->new_state_tmp
.disk
== D_INCONSISTENT
? 4 : 0;
863 p
->uuid
[UI_FLAGS
] = cpu_to_be64(uuid_flags
);
866 return drbd_send_command(peer_device
, sock
, P_UUIDS
, sizeof(*p
), NULL
, 0);
869 int drbd_send_uuids(struct drbd_peer_device
*peer_device
)
871 return _drbd_send_uuids(peer_device
, 0);
874 int drbd_send_uuids_skip_initial_sync(struct drbd_peer_device
*peer_device
)
876 return _drbd_send_uuids(peer_device
, 8);
879 void drbd_print_uuids(struct drbd_device
*device
, const char *text
)
881 if (get_ldev_if_state(device
, D_NEGOTIATING
)) {
882 u64
*uuid
= device
->ldev
->md
.uuid
;
883 drbd_info(device
, "%s %016llX:%016llX:%016llX:%016llX\n",
885 (unsigned long long)uuid
[UI_CURRENT
],
886 (unsigned long long)uuid
[UI_BITMAP
],
887 (unsigned long long)uuid
[UI_HISTORY_START
],
888 (unsigned long long)uuid
[UI_HISTORY_END
]);
891 drbd_info(device
, "%s effective data uuid: %016llX\n",
893 (unsigned long long)device
->ed_uuid
);
897 void drbd_gen_and_send_sync_uuid(struct drbd_peer_device
*peer_device
)
899 struct drbd_device
*device
= peer_device
->device
;
900 struct drbd_socket
*sock
;
904 D_ASSERT(device
, device
->state
.disk
== D_UP_TO_DATE
);
906 uuid
= device
->ldev
->md
.uuid
[UI_BITMAP
];
907 if (uuid
&& uuid
!= UUID_JUST_CREATED
)
908 uuid
= uuid
+ UUID_NEW_BM_OFFSET
;
910 get_random_bytes(&uuid
, sizeof(u64
));
911 drbd_uuid_set(device
, UI_BITMAP
, uuid
);
912 drbd_print_uuids(device
, "updated sync UUID");
913 drbd_md_sync(device
);
915 sock
= &peer_device
->connection
->data
;
916 p
= drbd_prepare_command(peer_device
, sock
);
918 p
->uuid
= cpu_to_be64(uuid
);
919 drbd_send_command(peer_device
, sock
, P_SYNC_UUID
, sizeof(*p
), NULL
, 0);
923 int drbd_send_sizes(struct drbd_peer_device
*peer_device
, int trigger_reply
, enum dds_flags flags
)
925 struct drbd_device
*device
= peer_device
->device
;
926 struct drbd_socket
*sock
;
928 sector_t d_size
, u_size
;
930 unsigned int max_bio_size
;
932 if (get_ldev_if_state(device
, D_NEGOTIATING
)) {
933 D_ASSERT(device
, device
->ldev
->backing_bdev
);
934 d_size
= drbd_get_max_capacity(device
->ldev
);
936 u_size
= rcu_dereference(device
->ldev
->disk_conf
)->disk_size
;
938 q_order_type
= drbd_queue_order_type(device
);
939 max_bio_size
= queue_max_hw_sectors(device
->ldev
->backing_bdev
->bd_disk
->queue
) << 9;
940 max_bio_size
= min(max_bio_size
, DRBD_MAX_BIO_SIZE
);
945 q_order_type
= QUEUE_ORDERED_NONE
;
946 max_bio_size
= DRBD_MAX_BIO_SIZE
; /* ... multiple BIOs per peer_request */
949 sock
= &peer_device
->connection
->data
;
950 p
= drbd_prepare_command(peer_device
, sock
);
954 if (peer_device
->connection
->agreed_pro_version
<= 94)
955 max_bio_size
= min(max_bio_size
, DRBD_MAX_SIZE_H80_PACKET
);
956 else if (peer_device
->connection
->agreed_pro_version
< 100)
957 max_bio_size
= min(max_bio_size
, DRBD_MAX_BIO_SIZE_P95
);
959 p
->d_size
= cpu_to_be64(d_size
);
960 p
->u_size
= cpu_to_be64(u_size
);
961 p
->c_size
= cpu_to_be64(trigger_reply
? 0 : drbd_get_capacity(device
->this_bdev
));
962 p
->max_bio_size
= cpu_to_be32(max_bio_size
);
963 p
->queue_order_type
= cpu_to_be16(q_order_type
);
964 p
->dds_flags
= cpu_to_be16(flags
);
965 return drbd_send_command(peer_device
, sock
, P_SIZES
, sizeof(*p
), NULL
, 0);
969 * drbd_send_current_state() - Sends the drbd state to the peer
970 * @peer_device: DRBD peer device.
972 int drbd_send_current_state(struct drbd_peer_device
*peer_device
)
974 struct drbd_socket
*sock
;
977 sock
= &peer_device
->connection
->data
;
978 p
= drbd_prepare_command(peer_device
, sock
);
981 p
->state
= cpu_to_be32(peer_device
->device
->state
.i
); /* Within the send mutex */
982 return drbd_send_command(peer_device
, sock
, P_STATE
, sizeof(*p
), NULL
, 0);
986 * drbd_send_state() - After a state change, sends the new state to the peer
987 * @peer_device: DRBD peer device.
988 * @state: the state to send, not necessarily the current state.
990 * Each state change queues an "after_state_ch" work, which will eventually
991 * send the resulting new state to the peer. If more state changes happen
992 * between queuing and processing of the after_state_ch work, we still
993 * want to send each intermediary state in the order it occurred.
995 int drbd_send_state(struct drbd_peer_device
*peer_device
, union drbd_state state
)
997 struct drbd_socket
*sock
;
1000 sock
= &peer_device
->connection
->data
;
1001 p
= drbd_prepare_command(peer_device
, sock
);
1004 p
->state
= cpu_to_be32(state
.i
); /* Within the send mutex */
1005 return drbd_send_command(peer_device
, sock
, P_STATE
, sizeof(*p
), NULL
, 0);
1008 int drbd_send_state_req(struct drbd_peer_device
*peer_device
, union drbd_state mask
, union drbd_state val
)
1010 struct drbd_socket
*sock
;
1011 struct p_req_state
*p
;
1013 sock
= &peer_device
->connection
->data
;
1014 p
= drbd_prepare_command(peer_device
, sock
);
1017 p
->mask
= cpu_to_be32(mask
.i
);
1018 p
->val
= cpu_to_be32(val
.i
);
1019 return drbd_send_command(peer_device
, sock
, P_STATE_CHG_REQ
, sizeof(*p
), NULL
, 0);
1022 int conn_send_state_req(struct drbd_connection
*connection
, union drbd_state mask
, union drbd_state val
)
1024 enum drbd_packet cmd
;
1025 struct drbd_socket
*sock
;
1026 struct p_req_state
*p
;
1028 cmd
= connection
->agreed_pro_version
< 100 ? P_STATE_CHG_REQ
: P_CONN_ST_CHG_REQ
;
1029 sock
= &connection
->data
;
1030 p
= conn_prepare_command(connection
, sock
);
1033 p
->mask
= cpu_to_be32(mask
.i
);
1034 p
->val
= cpu_to_be32(val
.i
);
1035 return conn_send_command(connection
, sock
, cmd
, sizeof(*p
), NULL
, 0);
1038 void drbd_send_sr_reply(struct drbd_peer_device
*peer_device
, enum drbd_state_rv retcode
)
1040 struct drbd_socket
*sock
;
1041 struct p_req_state_reply
*p
;
1043 sock
= &peer_device
->connection
->meta
;
1044 p
= drbd_prepare_command(peer_device
, sock
);
1046 p
->retcode
= cpu_to_be32(retcode
);
1047 drbd_send_command(peer_device
, sock
, P_STATE_CHG_REPLY
, sizeof(*p
), NULL
, 0);
1051 void conn_send_sr_reply(struct drbd_connection
*connection
, enum drbd_state_rv retcode
)
1053 struct drbd_socket
*sock
;
1054 struct p_req_state_reply
*p
;
1055 enum drbd_packet cmd
= connection
->agreed_pro_version
< 100 ? P_STATE_CHG_REPLY
: P_CONN_ST_CHG_REPLY
;
1057 sock
= &connection
->meta
;
1058 p
= conn_prepare_command(connection
, sock
);
1060 p
->retcode
= cpu_to_be32(retcode
);
1061 conn_send_command(connection
, sock
, cmd
, sizeof(*p
), NULL
, 0);
1065 static void dcbp_set_code(struct p_compressed_bm
*p
, enum drbd_bitmap_code code
)
1067 BUG_ON(code
& ~0xf);
1068 p
->encoding
= (p
->encoding
& ~0xf) | code
;
1071 static void dcbp_set_start(struct p_compressed_bm
*p
, int set
)
1073 p
->encoding
= (p
->encoding
& ~0x80) | (set
? 0x80 : 0);
1076 static void dcbp_set_pad_bits(struct p_compressed_bm
*p
, int n
)
1079 p
->encoding
= (p
->encoding
& (~0x7 << 4)) | (n
<< 4);
1082 static int fill_bitmap_rle_bits(struct drbd_device
*device
,
1083 struct p_compressed_bm
*p
,
1085 struct bm_xfer_ctx
*c
)
1087 struct bitstream bs
;
1088 unsigned long plain_bits
;
1095 /* may we use this feature? */
1097 use_rle
= rcu_dereference(first_peer_device(device
)->connection
->net_conf
)->use_rle
;
1099 if (!use_rle
|| first_peer_device(device
)->connection
->agreed_pro_version
< 90)
1102 if (c
->bit_offset
>= c
->bm_bits
)
1103 return 0; /* nothing to do. */
1105 /* use at most thus many bytes */
1106 bitstream_init(&bs
, p
->code
, size
, 0);
1107 memset(p
->code
, 0, size
);
1108 /* plain bits covered in this code string */
1111 /* p->encoding & 0x80 stores whether the first run length is set.
1112 * bit offset is implicit.
1113 * start with toggle == 2 to be able to tell the first iteration */
1116 /* see how much plain bits we can stuff into one packet
1117 * using RLE and VLI. */
1119 tmp
= (toggle
== 0) ? _drbd_bm_find_next_zero(device
, c
->bit_offset
)
1120 : _drbd_bm_find_next(device
, c
->bit_offset
);
1123 rl
= tmp
- c
->bit_offset
;
1125 if (toggle
== 2) { /* first iteration */
1127 /* the first checked bit was set,
1128 * store start value, */
1129 dcbp_set_start(p
, 1);
1130 /* but skip encoding of zero run length */
1134 dcbp_set_start(p
, 0);
1137 /* paranoia: catch zero runlength.
1138 * can only happen if bitmap is modified while we scan it. */
1140 drbd_err(device
, "unexpected zero runlength while encoding bitmap "
1141 "t:%u bo:%lu\n", toggle
, c
->bit_offset
);
1145 bits
= vli_encode_bits(&bs
, rl
);
1146 if (bits
== -ENOBUFS
) /* buffer full */
1149 drbd_err(device
, "error while encoding bitmap: %d\n", bits
);
1155 c
->bit_offset
= tmp
;
1156 } while (c
->bit_offset
< c
->bm_bits
);
1158 len
= bs
.cur
.b
- p
->code
+ !!bs
.cur
.bit
;
1160 if (plain_bits
< (len
<< 3)) {
1161 /* incompressible with this method.
1162 * we need to rewind both word and bit position. */
1163 c
->bit_offset
-= plain_bits
;
1164 bm_xfer_ctx_bit_to_word_offset(c
);
1165 c
->bit_offset
= c
->word_offset
* BITS_PER_LONG
;
1169 /* RLE + VLI was able to compress it just fine.
1170 * update c->word_offset. */
1171 bm_xfer_ctx_bit_to_word_offset(c
);
1173 /* store pad_bits */
1174 dcbp_set_pad_bits(p
, (8 - bs
.cur
.bit
) & 0x7);
1180 * send_bitmap_rle_or_plain
1182 * Return 0 when done, 1 when another iteration is needed, and a negative error
1183 * code upon failure.
1186 send_bitmap_rle_or_plain(struct drbd_device
*device
, struct bm_xfer_ctx
*c
)
1188 struct drbd_socket
*sock
= &first_peer_device(device
)->connection
->data
;
1189 unsigned int header_size
= drbd_header_size(first_peer_device(device
)->connection
);
1190 struct p_compressed_bm
*p
= sock
->sbuf
+ header_size
;
1193 len
= fill_bitmap_rle_bits(device
, p
,
1194 DRBD_SOCKET_BUFFER_SIZE
- header_size
- sizeof(*p
), c
);
1199 dcbp_set_code(p
, RLE_VLI_Bits
);
1200 err
= __send_command(first_peer_device(device
)->connection
, device
->vnr
, sock
,
1201 P_COMPRESSED_BITMAP
, sizeof(*p
) + len
,
1204 c
->bytes
[0] += header_size
+ sizeof(*p
) + len
;
1206 if (c
->bit_offset
>= c
->bm_bits
)
1209 /* was not compressible.
1210 * send a buffer full of plain text bits instead. */
1211 unsigned int data_size
;
1212 unsigned long num_words
;
1213 unsigned long *p
= sock
->sbuf
+ header_size
;
1215 data_size
= DRBD_SOCKET_BUFFER_SIZE
- header_size
;
1216 num_words
= min_t(size_t, data_size
/ sizeof(*p
),
1217 c
->bm_words
- c
->word_offset
);
1218 len
= num_words
* sizeof(*p
);
1220 drbd_bm_get_lel(device
, c
->word_offset
, num_words
, p
);
1221 err
= __send_command(first_peer_device(device
)->connection
, device
->vnr
, sock
, P_BITMAP
, len
, NULL
, 0);
1222 c
->word_offset
+= num_words
;
1223 c
->bit_offset
= c
->word_offset
* BITS_PER_LONG
;
1226 c
->bytes
[1] += header_size
+ len
;
1228 if (c
->bit_offset
> c
->bm_bits
)
1229 c
->bit_offset
= c
->bm_bits
;
1233 INFO_bm_xfer_stats(device
, "send", c
);
1241 /* See the comment at receive_bitmap() */
1242 static int _drbd_send_bitmap(struct drbd_device
*device
)
1244 struct bm_xfer_ctx c
;
1247 if (!expect(device
->bitmap
))
1250 if (get_ldev(device
)) {
1251 if (drbd_md_test_flag(device
->ldev
, MDF_FULL_SYNC
)) {
1252 drbd_info(device
, "Writing the whole bitmap, MDF_FullSync was set.\n");
1253 drbd_bm_set_all(device
);
1254 if (drbd_bm_write(device
)) {
1255 /* write_bm did fail! Leave full sync flag set in Meta P_DATA
1256 * but otherwise process as per normal - need to tell other
1257 * side that a full resync is required! */
1258 drbd_err(device
, "Failed to write bitmap to disk!\n");
1260 drbd_md_clear_flag(device
, MDF_FULL_SYNC
);
1261 drbd_md_sync(device
);
1267 c
= (struct bm_xfer_ctx
) {
1268 .bm_bits
= drbd_bm_bits(device
),
1269 .bm_words
= drbd_bm_words(device
),
1273 err
= send_bitmap_rle_or_plain(device
, &c
);
1279 int drbd_send_bitmap(struct drbd_device
*device
)
1281 struct drbd_socket
*sock
= &first_peer_device(device
)->connection
->data
;
1284 mutex_lock(&sock
->mutex
);
1286 err
= !_drbd_send_bitmap(device
);
1287 mutex_unlock(&sock
->mutex
);
1291 void drbd_send_b_ack(struct drbd_connection
*connection
, u32 barrier_nr
, u32 set_size
)
1293 struct drbd_socket
*sock
;
1294 struct p_barrier_ack
*p
;
1296 if (connection
->cstate
< C_WF_REPORT_PARAMS
)
1299 sock
= &connection
->meta
;
1300 p
= conn_prepare_command(connection
, sock
);
1303 p
->barrier
= barrier_nr
;
1304 p
->set_size
= cpu_to_be32(set_size
);
1305 conn_send_command(connection
, sock
, P_BARRIER_ACK
, sizeof(*p
), NULL
, 0);
1309 * _drbd_send_ack() - Sends an ack packet
1310 * @device: DRBD device.
1311 * @cmd: Packet command code.
1312 * @sector: sector, needs to be in big endian byte order
1313 * @blksize: size in byte, needs to be in big endian byte order
1314 * @block_id: Id, big endian byte order
1316 static int _drbd_send_ack(struct drbd_peer_device
*peer_device
, enum drbd_packet cmd
,
1317 u64 sector
, u32 blksize
, u64 block_id
)
1319 struct drbd_socket
*sock
;
1320 struct p_block_ack
*p
;
1322 if (peer_device
->device
->state
.conn
< C_CONNECTED
)
1325 sock
= &peer_device
->connection
->meta
;
1326 p
= drbd_prepare_command(peer_device
, sock
);
1330 p
->block_id
= block_id
;
1331 p
->blksize
= blksize
;
1332 p
->seq_num
= cpu_to_be32(atomic_inc_return(&peer_device
->device
->packet_seq
));
1333 return drbd_send_command(peer_device
, sock
, cmd
, sizeof(*p
), NULL
, 0);
1336 /* dp->sector and dp->block_id already/still in network byte order,
1337 * data_size is payload size according to dp->head,
1338 * and may need to be corrected for digest size. */
1339 void drbd_send_ack_dp(struct drbd_peer_device
*peer_device
, enum drbd_packet cmd
,
1340 struct p_data
*dp
, int data_size
)
1342 if (peer_device
->connection
->peer_integrity_tfm
)
1343 data_size
-= crypto_hash_digestsize(peer_device
->connection
->peer_integrity_tfm
);
1344 _drbd_send_ack(peer_device
, cmd
, dp
->sector
, cpu_to_be32(data_size
),
1348 void drbd_send_ack_rp(struct drbd_peer_device
*peer_device
, enum drbd_packet cmd
,
1349 struct p_block_req
*rp
)
1351 _drbd_send_ack(peer_device
, cmd
, rp
->sector
, rp
->blksize
, rp
->block_id
);
1355 * drbd_send_ack() - Sends an ack packet
1356 * @device: DRBD device
1357 * @cmd: packet command code
1358 * @peer_req: peer request
1360 int drbd_send_ack(struct drbd_peer_device
*peer_device
, enum drbd_packet cmd
,
1361 struct drbd_peer_request
*peer_req
)
1363 return _drbd_send_ack(peer_device
, cmd
,
1364 cpu_to_be64(peer_req
->i
.sector
),
1365 cpu_to_be32(peer_req
->i
.size
),
1366 peer_req
->block_id
);
1369 /* This function misuses the block_id field to signal if the blocks
1370 * are is sync or not. */
1371 int drbd_send_ack_ex(struct drbd_peer_device
*peer_device
, enum drbd_packet cmd
,
1372 sector_t sector
, int blksize
, u64 block_id
)
1374 return _drbd_send_ack(peer_device
, cmd
,
1375 cpu_to_be64(sector
),
1376 cpu_to_be32(blksize
),
1377 cpu_to_be64(block_id
));
1380 int drbd_send_drequest(struct drbd_peer_device
*peer_device
, int cmd
,
1381 sector_t sector
, int size
, u64 block_id
)
1383 struct drbd_socket
*sock
;
1384 struct p_block_req
*p
;
1386 sock
= &peer_device
->connection
->data
;
1387 p
= drbd_prepare_command(peer_device
, sock
);
1390 p
->sector
= cpu_to_be64(sector
);
1391 p
->block_id
= block_id
;
1392 p
->blksize
= cpu_to_be32(size
);
1393 return drbd_send_command(peer_device
, sock
, cmd
, sizeof(*p
), NULL
, 0);
1396 int drbd_send_drequest_csum(struct drbd_peer_device
*peer_device
, sector_t sector
, int size
,
1397 void *digest
, int digest_size
, enum drbd_packet cmd
)
1399 struct drbd_socket
*sock
;
1400 struct p_block_req
*p
;
1402 /* FIXME: Put the digest into the preallocated socket buffer. */
1404 sock
= &peer_device
->connection
->data
;
1405 p
= drbd_prepare_command(peer_device
, sock
);
1408 p
->sector
= cpu_to_be64(sector
);
1409 p
->block_id
= ID_SYNCER
/* unused */;
1410 p
->blksize
= cpu_to_be32(size
);
1411 return drbd_send_command(peer_device
, sock
, cmd
, sizeof(*p
), digest
, digest_size
);
1414 int drbd_send_ov_request(struct drbd_peer_device
*peer_device
, sector_t sector
, int size
)
1416 struct drbd_socket
*sock
;
1417 struct p_block_req
*p
;
1419 sock
= &peer_device
->connection
->data
;
1420 p
= drbd_prepare_command(peer_device
, sock
);
1423 p
->sector
= cpu_to_be64(sector
);
1424 p
->block_id
= ID_SYNCER
/* unused */;
1425 p
->blksize
= cpu_to_be32(size
);
1426 return drbd_send_command(peer_device
, sock
, P_OV_REQUEST
, sizeof(*p
), NULL
, 0);
1429 /* called on sndtimeo
1430 * returns false if we should retry,
1431 * true if we think connection is dead
1433 static int we_should_drop_the_connection(struct drbd_connection
*connection
, struct socket
*sock
)
1436 /* long elapsed = (long)(jiffies - device->last_received); */
1438 drop_it
= connection
->meta
.socket
== sock
1439 || !connection
->asender
.task
1440 || get_t_state(&connection
->asender
) != RUNNING
1441 || connection
->cstate
< C_WF_REPORT_PARAMS
;
1446 drop_it
= !--connection
->ko_count
;
1448 drbd_err(connection
, "[%s/%d] sock_sendmsg time expired, ko = %u\n",
1449 current
->comm
, current
->pid
, connection
->ko_count
);
1450 request_ping(connection
);
1453 return drop_it
; /* && (device->state == R_PRIMARY) */;
1456 static void drbd_update_congested(struct drbd_connection
*connection
)
1458 struct sock
*sk
= connection
->data
.socket
->sk
;
1459 if (sk
->sk_wmem_queued
> sk
->sk_sndbuf
* 4 / 5)
1460 set_bit(NET_CONGESTED
, &connection
->flags
);
1463 /* The idea of sendpage seems to be to put some kind of reference
1464 * to the page into the skb, and to hand it over to the NIC. In
1465 * this process get_page() gets called.
1467 * As soon as the page was really sent over the network put_page()
1468 * gets called by some part of the network layer. [ NIC driver? ]
1470 * [ get_page() / put_page() increment/decrement the count. If count
1471 * reaches 0 the page will be freed. ]
1473 * This works nicely with pages from FSs.
1474 * But this means that in protocol A we might signal IO completion too early!
1476 * In order not to corrupt data during a resync we must make sure
1477 * that we do not reuse our own buffer pages (EEs) to early, therefore
1478 * we have the net_ee list.
1480 * XFS seems to have problems, still, it submits pages with page_count == 0!
1481 * As a workaround, we disable sendpage on pages
1482 * with page_count == 0 or PageSlab.
1484 static int _drbd_no_send_page(struct drbd_peer_device
*peer_device
, struct page
*page
,
1485 int offset
, size_t size
, unsigned msg_flags
)
1487 struct socket
*socket
;
1491 socket
= peer_device
->connection
->data
.socket
;
1492 addr
= kmap(page
) + offset
;
1493 err
= drbd_send_all(peer_device
->connection
, socket
, addr
, size
, msg_flags
);
1496 peer_device
->device
->send_cnt
+= size
>> 9;
1500 static int _drbd_send_page(struct drbd_peer_device
*peer_device
, struct page
*page
,
1501 int offset
, size_t size
, unsigned msg_flags
)
1503 struct socket
*socket
= peer_device
->connection
->data
.socket
;
1504 mm_segment_t oldfs
= get_fs();
1508 /* e.g. XFS meta- & log-data is in slab pages, which have a
1509 * page_count of 0 and/or have PageSlab() set.
1510 * we cannot use send_page for those, as that does get_page();
1511 * put_page(); and would cause either a VM_BUG directly, or
1512 * __page_cache_release a page that would actually still be referenced
1513 * by someone, leading to some obscure delayed Oops somewhere else. */
1514 if (disable_sendpage
|| (page_count(page
) < 1) || PageSlab(page
))
1515 return _drbd_no_send_page(peer_device
, page
, offset
, size
, msg_flags
);
1517 msg_flags
|= MSG_NOSIGNAL
;
1518 drbd_update_congested(peer_device
->connection
);
1523 sent
= socket
->ops
->sendpage(socket
, page
, offset
, len
, msg_flags
);
1525 if (sent
== -EAGAIN
) {
1526 if (we_should_drop_the_connection(peer_device
->connection
, socket
))
1530 drbd_warn(peer_device
->device
, "%s: size=%d len=%d sent=%d\n",
1531 __func__
, (int)size
, len
, sent
);
1538 } while (len
> 0 /* THINK && device->cstate >= C_CONNECTED*/);
1540 clear_bit(NET_CONGESTED
, &peer_device
->connection
->flags
);
1544 peer_device
->device
->send_cnt
+= size
>> 9;
1549 static int _drbd_send_bio(struct drbd_peer_device
*peer_device
, struct bio
*bio
)
1551 struct bio_vec bvec
;
1552 struct bvec_iter iter
;
1554 /* hint all but last page with MSG_MORE */
1555 bio_for_each_segment(bvec
, bio
, iter
) {
1558 err
= _drbd_no_send_page(peer_device
, bvec
.bv_page
,
1559 bvec
.bv_offset
, bvec
.bv_len
,
1560 bio_iter_last(bvec
, iter
)
1568 static int _drbd_send_zc_bio(struct drbd_peer_device
*peer_device
, struct bio
*bio
)
1570 struct bio_vec bvec
;
1571 struct bvec_iter iter
;
1573 /* hint all but last page with MSG_MORE */
1574 bio_for_each_segment(bvec
, bio
, iter
) {
1577 err
= _drbd_send_page(peer_device
, bvec
.bv_page
,
1578 bvec
.bv_offset
, bvec
.bv_len
,
1579 bio_iter_last(bvec
, iter
) ? 0 : MSG_MORE
);
1586 static int _drbd_send_zc_ee(struct drbd_peer_device
*peer_device
,
1587 struct drbd_peer_request
*peer_req
)
1589 struct page
*page
= peer_req
->pages
;
1590 unsigned len
= peer_req
->i
.size
;
1593 /* hint all but last page with MSG_MORE */
1594 page_chain_for_each(page
) {
1595 unsigned l
= min_t(unsigned, len
, PAGE_SIZE
);
1597 err
= _drbd_send_page(peer_device
, page
, 0, l
,
1598 page_chain_next(page
) ? MSG_MORE
: 0);
1606 static u32
bio_flags_to_wire(struct drbd_connection
*connection
, unsigned long bi_rw
)
1608 if (connection
->agreed_pro_version
>= 95)
1609 return (bi_rw
& REQ_SYNC
? DP_RW_SYNC
: 0) |
1610 (bi_rw
& REQ_FUA
? DP_FUA
: 0) |
1611 (bi_rw
& REQ_FLUSH
? DP_FLUSH
: 0) |
1612 (bi_rw
& REQ_DISCARD
? DP_DISCARD
: 0);
1614 return bi_rw
& REQ_SYNC
? DP_RW_SYNC
: 0;
1617 /* Used to send write or TRIM aka REQ_DISCARD requests
1618 * R_PRIMARY -> Peer (P_DATA, P_TRIM)
1620 int drbd_send_dblock(struct drbd_peer_device
*peer_device
, struct drbd_request
*req
)
1622 struct drbd_device
*device
= peer_device
->device
;
1623 struct drbd_socket
*sock
;
1625 unsigned int dp_flags
= 0;
1629 sock
= &peer_device
->connection
->data
;
1630 p
= drbd_prepare_command(peer_device
, sock
);
1631 digest_size
= peer_device
->connection
->integrity_tfm
?
1632 crypto_hash_digestsize(peer_device
->connection
->integrity_tfm
) : 0;
1636 p
->sector
= cpu_to_be64(req
->i
.sector
);
1637 p
->block_id
= (unsigned long)req
;
1638 p
->seq_num
= cpu_to_be32(atomic_inc_return(&device
->packet_seq
));
1639 dp_flags
= bio_flags_to_wire(peer_device
->connection
, req
->master_bio
->bi_rw
);
1640 if (device
->state
.conn
>= C_SYNC_SOURCE
&&
1641 device
->state
.conn
<= C_PAUSED_SYNC_T
)
1642 dp_flags
|= DP_MAY_SET_IN_SYNC
;
1643 if (peer_device
->connection
->agreed_pro_version
>= 100) {
1644 if (req
->rq_state
& RQ_EXP_RECEIVE_ACK
)
1645 dp_flags
|= DP_SEND_RECEIVE_ACK
;
1646 /* During resync, request an explicit write ack,
1647 * even in protocol != C */
1648 if (req
->rq_state
& RQ_EXP_WRITE_ACK
1649 || (dp_flags
& DP_MAY_SET_IN_SYNC
))
1650 dp_flags
|= DP_SEND_WRITE_ACK
;
1652 p
->dp_flags
= cpu_to_be32(dp_flags
);
1654 if (dp_flags
& DP_DISCARD
) {
1655 struct p_trim
*t
= (struct p_trim
*)p
;
1656 t
->size
= cpu_to_be32(req
->i
.size
);
1657 err
= __send_command(peer_device
->connection
, device
->vnr
, sock
, P_TRIM
, sizeof(*t
), NULL
, 0);
1661 /* our digest is still only over the payload.
1662 * TRIM does not carry any payload. */
1664 drbd_csum_bio(peer_device
->connection
->integrity_tfm
, req
->master_bio
, p
+ 1);
1665 err
= __send_command(peer_device
->connection
, device
->vnr
, sock
, P_DATA
, sizeof(*p
) + digest_size
, NULL
, req
->i
.size
);
1667 /* For protocol A, we have to memcpy the payload into
1668 * socket buffers, as we may complete right away
1669 * as soon as we handed it over to tcp, at which point the data
1670 * pages may become invalid.
1672 * For data-integrity enabled, we copy it as well, so we can be
1673 * sure that even if the bio pages may still be modified, it
1674 * won't change the data on the wire, thus if the digest checks
1675 * out ok after sending on this side, but does not fit on the
1676 * receiving side, we sure have detected corruption elsewhere.
1678 if (!(req
->rq_state
& (RQ_EXP_RECEIVE_ACK
| RQ_EXP_WRITE_ACK
)) || digest_size
)
1679 err
= _drbd_send_bio(peer_device
, req
->master_bio
);
1681 err
= _drbd_send_zc_bio(peer_device
, req
->master_bio
);
1683 /* double check digest, sometimes buffers have been modified in flight. */
1684 if (digest_size
> 0 && digest_size
<= 64) {
1685 /* 64 byte, 512 bit, is the largest digest size
1686 * currently supported in kernel crypto. */
1687 unsigned char digest
[64];
1688 drbd_csum_bio(peer_device
->connection
->integrity_tfm
, req
->master_bio
, digest
);
1689 if (memcmp(p
+ 1, digest
, digest_size
)) {
1691 "Digest mismatch, buffer modified by upper layers during write: %llus +%u\n",
1692 (unsigned long long)req
->i
.sector
, req
->i
.size
);
1694 } /* else if (digest_size > 64) {
1695 ... Be noisy about digest too large ...
1699 mutex_unlock(&sock
->mutex
); /* locked by drbd_prepare_command() */
1704 /* answer packet, used to send data back for read requests:
1705 * Peer -> (diskless) R_PRIMARY (P_DATA_REPLY)
1706 * C_SYNC_SOURCE -> C_SYNC_TARGET (P_RS_DATA_REPLY)
1708 int drbd_send_block(struct drbd_peer_device
*peer_device
, enum drbd_packet cmd
,
1709 struct drbd_peer_request
*peer_req
)
1711 struct drbd_device
*device
= peer_device
->device
;
1712 struct drbd_socket
*sock
;
1717 sock
= &peer_device
->connection
->data
;
1718 p
= drbd_prepare_command(peer_device
, sock
);
1720 digest_size
= peer_device
->connection
->integrity_tfm
?
1721 crypto_hash_digestsize(peer_device
->connection
->integrity_tfm
) : 0;
1725 p
->sector
= cpu_to_be64(peer_req
->i
.sector
);
1726 p
->block_id
= peer_req
->block_id
;
1727 p
->seq_num
= 0; /* unused */
1730 drbd_csum_ee(peer_device
->connection
->integrity_tfm
, peer_req
, p
+ 1);
1731 err
= __send_command(peer_device
->connection
, device
->vnr
, sock
, cmd
, sizeof(*p
) + digest_size
, NULL
, peer_req
->i
.size
);
1733 err
= _drbd_send_zc_ee(peer_device
, peer_req
);
1734 mutex_unlock(&sock
->mutex
); /* locked by drbd_prepare_command() */
1739 int drbd_send_out_of_sync(struct drbd_peer_device
*peer_device
, struct drbd_request
*req
)
1741 struct drbd_socket
*sock
;
1742 struct p_block_desc
*p
;
1744 sock
= &peer_device
->connection
->data
;
1745 p
= drbd_prepare_command(peer_device
, sock
);
1748 p
->sector
= cpu_to_be64(req
->i
.sector
);
1749 p
->blksize
= cpu_to_be32(req
->i
.size
);
1750 return drbd_send_command(peer_device
, sock
, P_OUT_OF_SYNC
, sizeof(*p
), NULL
, 0);
1754 drbd_send distinguishes two cases:
1756 Packets sent via the data socket "sock"
1757 and packets sent via the meta data socket "msock"
1760 -----------------+-------------------------+------------------------------
1761 timeout conf.timeout / 2 conf.timeout / 2
1762 timeout action send a ping via msock Abort communication
1763 and close all sockets
1767 * you must have down()ed the appropriate [m]sock_mutex elsewhere!
1769 int drbd_send(struct drbd_connection
*connection
, struct socket
*sock
,
1770 void *buf
, size_t size
, unsigned msg_flags
)
1779 /* THINK if (signal_pending) return ... ? */
1784 msg
.msg_name
= NULL
;
1785 msg
.msg_namelen
= 0;
1786 msg
.msg_control
= NULL
;
1787 msg
.msg_controllen
= 0;
1788 msg
.msg_flags
= msg_flags
| MSG_NOSIGNAL
;
1790 if (sock
== connection
->data
.socket
) {
1792 connection
->ko_count
= rcu_dereference(connection
->net_conf
)->ko_count
;
1794 drbd_update_congested(connection
);
1798 * tcp_sendmsg does _not_ use its size parameter at all ?
1800 * -EAGAIN on timeout, -EINTR on signal.
1803 * do we need to block DRBD_SIG if sock == &meta.socket ??
1804 * otherwise wake_asender() might interrupt some send_*Ack !
1806 rv
= kernel_sendmsg(sock
, &msg
, &iov
, 1, size
);
1807 if (rv
== -EAGAIN
) {
1808 if (we_should_drop_the_connection(connection
, sock
))
1814 flush_signals(current
);
1822 } while (sent
< size
);
1824 if (sock
== connection
->data
.socket
)
1825 clear_bit(NET_CONGESTED
, &connection
->flags
);
1828 if (rv
!= -EAGAIN
) {
1829 drbd_err(connection
, "%s_sendmsg returned %d\n",
1830 sock
== connection
->meta
.socket
? "msock" : "sock",
1832 conn_request_state(connection
, NS(conn
, C_BROKEN_PIPE
), CS_HARD
);
1834 conn_request_state(connection
, NS(conn
, C_TIMEOUT
), CS_HARD
);
1841 * drbd_send_all - Send an entire buffer
1843 * Returns 0 upon success and a negative error value otherwise.
1845 int drbd_send_all(struct drbd_connection
*connection
, struct socket
*sock
, void *buffer
,
1846 size_t size
, unsigned msg_flags
)
1850 err
= drbd_send(connection
, sock
, buffer
, size
, msg_flags
);
1858 static int drbd_open(struct block_device
*bdev
, fmode_t mode
)
1860 struct drbd_device
*device
= bdev
->bd_disk
->private_data
;
1861 unsigned long flags
;
1864 mutex_lock(&drbd_main_mutex
);
1865 spin_lock_irqsave(&device
->resource
->req_lock
, flags
);
1866 /* to have a stable device->state.role
1867 * and no race with updating open_cnt */
1869 if (device
->state
.role
!= R_PRIMARY
) {
1870 if (mode
& FMODE_WRITE
)
1872 else if (!allow_oos
)
1878 spin_unlock_irqrestore(&device
->resource
->req_lock
, flags
);
1879 mutex_unlock(&drbd_main_mutex
);
1884 static void drbd_release(struct gendisk
*gd
, fmode_t mode
)
1886 struct drbd_device
*device
= gd
->private_data
;
1887 mutex_lock(&drbd_main_mutex
);
1889 mutex_unlock(&drbd_main_mutex
);
1892 static void drbd_set_defaults(struct drbd_device
*device
)
1894 /* Beware! The actual layout differs
1895 * between big endian and little endian */
1896 device
->state
= (union drbd_dev_state
) {
1897 { .role
= R_SECONDARY
,
1899 .conn
= C_STANDALONE
,
1905 void drbd_init_set_defaults(struct drbd_device
*device
)
1907 /* the memset(,0,) did most of this.
1908 * note: only assignments, no allocation in here */
1910 drbd_set_defaults(device
);
1912 atomic_set(&device
->ap_bio_cnt
, 0);
1913 atomic_set(&device
->ap_actlog_cnt
, 0);
1914 atomic_set(&device
->ap_pending_cnt
, 0);
1915 atomic_set(&device
->rs_pending_cnt
, 0);
1916 atomic_set(&device
->unacked_cnt
, 0);
1917 atomic_set(&device
->local_cnt
, 0);
1918 atomic_set(&device
->pp_in_use_by_net
, 0);
1919 atomic_set(&device
->rs_sect_in
, 0);
1920 atomic_set(&device
->rs_sect_ev
, 0);
1921 atomic_set(&device
->ap_in_flight
, 0);
1922 atomic_set(&device
->md_io
.in_use
, 0);
1924 mutex_init(&device
->own_state_mutex
);
1925 device
->state_mutex
= &device
->own_state_mutex
;
1927 spin_lock_init(&device
->al_lock
);
1928 spin_lock_init(&device
->peer_seq_lock
);
1930 INIT_LIST_HEAD(&device
->active_ee
);
1931 INIT_LIST_HEAD(&device
->sync_ee
);
1932 INIT_LIST_HEAD(&device
->done_ee
);
1933 INIT_LIST_HEAD(&device
->read_ee
);
1934 INIT_LIST_HEAD(&device
->net_ee
);
1935 INIT_LIST_HEAD(&device
->resync_reads
);
1936 INIT_LIST_HEAD(&device
->resync_work
.list
);
1937 INIT_LIST_HEAD(&device
->unplug_work
.list
);
1938 INIT_LIST_HEAD(&device
->bm_io_work
.w
.list
);
1939 INIT_LIST_HEAD(&device
->pending_master_completion
[0]);
1940 INIT_LIST_HEAD(&device
->pending_master_completion
[1]);
1941 INIT_LIST_HEAD(&device
->pending_completion
[0]);
1942 INIT_LIST_HEAD(&device
->pending_completion
[1]);
1944 device
->resync_work
.cb
= w_resync_timer
;
1945 device
->unplug_work
.cb
= w_send_write_hint
;
1946 device
->bm_io_work
.w
.cb
= w_bitmap_io
;
1948 init_timer(&device
->resync_timer
);
1949 init_timer(&device
->md_sync_timer
);
1950 init_timer(&device
->start_resync_timer
);
1951 init_timer(&device
->request_timer
);
1952 device
->resync_timer
.function
= resync_timer_fn
;
1953 device
->resync_timer
.data
= (unsigned long) device
;
1954 device
->md_sync_timer
.function
= md_sync_timer_fn
;
1955 device
->md_sync_timer
.data
= (unsigned long) device
;
1956 device
->start_resync_timer
.function
= start_resync_timer_fn
;
1957 device
->start_resync_timer
.data
= (unsigned long) device
;
1958 device
->request_timer
.function
= request_timer_fn
;
1959 device
->request_timer
.data
= (unsigned long) device
;
1961 init_waitqueue_head(&device
->misc_wait
);
1962 init_waitqueue_head(&device
->state_wait
);
1963 init_waitqueue_head(&device
->ee_wait
);
1964 init_waitqueue_head(&device
->al_wait
);
1965 init_waitqueue_head(&device
->seq_wait
);
1967 device
->resync_wenr
= LC_FREE
;
1968 device
->peer_max_bio_size
= DRBD_MAX_BIO_SIZE_SAFE
;
1969 device
->local_max_bio_size
= DRBD_MAX_BIO_SIZE_SAFE
;
1972 void drbd_device_cleanup(struct drbd_device
*device
)
1975 if (first_peer_device(device
)->connection
->receiver
.t_state
!= NONE
)
1976 drbd_err(device
, "ASSERT FAILED: receiver t_state == %d expected 0.\n",
1977 first_peer_device(device
)->connection
->receiver
.t_state
);
1979 device
->al_writ_cnt
=
1980 device
->bm_writ_cnt
=
1988 device
->rs_failed
= 0;
1989 device
->rs_last_events
= 0;
1990 device
->rs_last_sect_ev
= 0;
1991 for (i
= 0; i
< DRBD_SYNC_MARKS
; i
++) {
1992 device
->rs_mark_left
[i
] = 0;
1993 device
->rs_mark_time
[i
] = 0;
1995 D_ASSERT(device
, first_peer_device(device
)->connection
->net_conf
== NULL
);
1997 drbd_set_my_capacity(device
, 0);
1998 if (device
->bitmap
) {
1999 /* maybe never allocated. */
2000 drbd_bm_resize(device
, 0, 1);
2001 drbd_bm_cleanup(device
);
2004 drbd_free_ldev(device
->ldev
);
2005 device
->ldev
= NULL
;
2007 clear_bit(AL_SUSPENDED
, &device
->flags
);
2009 D_ASSERT(device
, list_empty(&device
->active_ee
));
2010 D_ASSERT(device
, list_empty(&device
->sync_ee
));
2011 D_ASSERT(device
, list_empty(&device
->done_ee
));
2012 D_ASSERT(device
, list_empty(&device
->read_ee
));
2013 D_ASSERT(device
, list_empty(&device
->net_ee
));
2014 D_ASSERT(device
, list_empty(&device
->resync_reads
));
2015 D_ASSERT(device
, list_empty(&first_peer_device(device
)->connection
->sender_work
.q
));
2016 D_ASSERT(device
, list_empty(&device
->resync_work
.list
));
2017 D_ASSERT(device
, list_empty(&device
->unplug_work
.list
));
2019 drbd_set_defaults(device
);
2023 static void drbd_destroy_mempools(void)
2027 while (drbd_pp_pool
) {
2028 page
= drbd_pp_pool
;
2029 drbd_pp_pool
= (struct page
*)page_private(page
);
2034 /* D_ASSERT(device, atomic_read(&drbd_pp_vacant)==0); */
2036 if (drbd_md_io_bio_set
)
2037 bioset_free(drbd_md_io_bio_set
);
2038 if (drbd_md_io_page_pool
)
2039 mempool_destroy(drbd_md_io_page_pool
);
2040 if (drbd_ee_mempool
)
2041 mempool_destroy(drbd_ee_mempool
);
2042 if (drbd_request_mempool
)
2043 mempool_destroy(drbd_request_mempool
);
2045 kmem_cache_destroy(drbd_ee_cache
);
2046 if (drbd_request_cache
)
2047 kmem_cache_destroy(drbd_request_cache
);
2048 if (drbd_bm_ext_cache
)
2049 kmem_cache_destroy(drbd_bm_ext_cache
);
2050 if (drbd_al_ext_cache
)
2051 kmem_cache_destroy(drbd_al_ext_cache
);
2053 drbd_md_io_bio_set
= NULL
;
2054 drbd_md_io_page_pool
= NULL
;
2055 drbd_ee_mempool
= NULL
;
2056 drbd_request_mempool
= NULL
;
2057 drbd_ee_cache
= NULL
;
2058 drbd_request_cache
= NULL
;
2059 drbd_bm_ext_cache
= NULL
;
2060 drbd_al_ext_cache
= NULL
;
2065 static int drbd_create_mempools(void)
2068 const int number
= (DRBD_MAX_BIO_SIZE
/PAGE_SIZE
) * minor_count
;
2071 /* prepare our caches and mempools */
2072 drbd_request_mempool
= NULL
;
2073 drbd_ee_cache
= NULL
;
2074 drbd_request_cache
= NULL
;
2075 drbd_bm_ext_cache
= NULL
;
2076 drbd_al_ext_cache
= NULL
;
2077 drbd_pp_pool
= NULL
;
2078 drbd_md_io_page_pool
= NULL
;
2079 drbd_md_io_bio_set
= NULL
;
2082 drbd_request_cache
= kmem_cache_create(
2083 "drbd_req", sizeof(struct drbd_request
), 0, 0, NULL
);
2084 if (drbd_request_cache
== NULL
)
2087 drbd_ee_cache
= kmem_cache_create(
2088 "drbd_ee", sizeof(struct drbd_peer_request
), 0, 0, NULL
);
2089 if (drbd_ee_cache
== NULL
)
2092 drbd_bm_ext_cache
= kmem_cache_create(
2093 "drbd_bm", sizeof(struct bm_extent
), 0, 0, NULL
);
2094 if (drbd_bm_ext_cache
== NULL
)
2097 drbd_al_ext_cache
= kmem_cache_create(
2098 "drbd_al", sizeof(struct lc_element
), 0, 0, NULL
);
2099 if (drbd_al_ext_cache
== NULL
)
2103 drbd_md_io_bio_set
= bioset_create(DRBD_MIN_POOL_PAGES
, 0);
2104 if (drbd_md_io_bio_set
== NULL
)
2107 drbd_md_io_page_pool
= mempool_create_page_pool(DRBD_MIN_POOL_PAGES
, 0);
2108 if (drbd_md_io_page_pool
== NULL
)
2111 drbd_request_mempool
= mempool_create_slab_pool(number
,
2112 drbd_request_cache
);
2113 if (drbd_request_mempool
== NULL
)
2116 drbd_ee_mempool
= mempool_create_slab_pool(number
, drbd_ee_cache
);
2117 if (drbd_ee_mempool
== NULL
)
2120 /* drbd's page pool */
2121 spin_lock_init(&drbd_pp_lock
);
2123 for (i
= 0; i
< number
; i
++) {
2124 page
= alloc_page(GFP_HIGHUSER
);
2127 set_page_private(page
, (unsigned long)drbd_pp_pool
);
2128 drbd_pp_pool
= page
;
2130 drbd_pp_vacant
= number
;
2135 drbd_destroy_mempools(); /* in case we allocated some */
2139 static void drbd_release_all_peer_reqs(struct drbd_device
*device
)
2143 rr
= drbd_free_peer_reqs(device
, &device
->active_ee
);
2145 drbd_err(device
, "%d EEs in active list found!\n", rr
);
2147 rr
= drbd_free_peer_reqs(device
, &device
->sync_ee
);
2149 drbd_err(device
, "%d EEs in sync list found!\n", rr
);
2151 rr
= drbd_free_peer_reqs(device
, &device
->read_ee
);
2153 drbd_err(device
, "%d EEs in read list found!\n", rr
);
2155 rr
= drbd_free_peer_reqs(device
, &device
->done_ee
);
2157 drbd_err(device
, "%d EEs in done list found!\n", rr
);
2159 rr
= drbd_free_peer_reqs(device
, &device
->net_ee
);
2161 drbd_err(device
, "%d EEs in net list found!\n", rr
);
2164 /* caution. no locking. */
2165 void drbd_destroy_device(struct kref
*kref
)
2167 struct drbd_device
*device
= container_of(kref
, struct drbd_device
, kref
);
2168 struct drbd_resource
*resource
= device
->resource
;
2169 struct drbd_peer_device
*peer_device
, *tmp_peer_device
;
2171 del_timer_sync(&device
->request_timer
);
2173 /* paranoia asserts */
2174 D_ASSERT(device
, device
->open_cnt
== 0);
2175 /* end paranoia asserts */
2177 /* cleanup stuff that may have been allocated during
2178 * device (re-)configuration or state changes */
2180 if (device
->this_bdev
)
2181 bdput(device
->this_bdev
);
2183 drbd_free_ldev(device
->ldev
);
2184 device
->ldev
= NULL
;
2186 drbd_release_all_peer_reqs(device
);
2188 lc_destroy(device
->act_log
);
2189 lc_destroy(device
->resync
);
2191 kfree(device
->p_uuid
);
2192 /* device->p_uuid = NULL; */
2194 if (device
->bitmap
) /* should no longer be there. */
2195 drbd_bm_cleanup(device
);
2196 __free_page(device
->md_io
.page
);
2197 put_disk(device
->vdisk
);
2198 blk_cleanup_queue(device
->rq_queue
);
2199 kfree(device
->rs_plan_s
);
2201 /* not for_each_connection(connection, resource):
2202 * those may have been cleaned up and disassociated already.
2204 for_each_peer_device_safe(peer_device
, tmp_peer_device
, device
) {
2205 kref_put(&peer_device
->connection
->kref
, drbd_destroy_connection
);
2208 memset(device
, 0xfd, sizeof(*device
));
2210 kref_put(&resource
->kref
, drbd_destroy_resource
);
2213 /* One global retry thread, if we need to push back some bio and have it
2214 * reinserted through our make request function.
2216 static struct retry_worker
{
2217 struct workqueue_struct
*wq
;
2218 struct work_struct worker
;
2221 struct list_head writes
;
2224 static void do_retry(struct work_struct
*ws
)
2226 struct retry_worker
*retry
= container_of(ws
, struct retry_worker
, worker
);
2228 struct drbd_request
*req
, *tmp
;
2230 spin_lock_irq(&retry
->lock
);
2231 list_splice_init(&retry
->writes
, &writes
);
2232 spin_unlock_irq(&retry
->lock
);
2234 list_for_each_entry_safe(req
, tmp
, &writes
, tl_requests
) {
2235 struct drbd_device
*device
= req
->device
;
2236 struct bio
*bio
= req
->master_bio
;
2237 unsigned long start_jif
= req
->start_jif
;
2241 expect(atomic_read(&req
->completion_ref
) == 0) &&
2242 expect(req
->rq_state
& RQ_POSTPONED
) &&
2243 expect((req
->rq_state
& RQ_LOCAL_PENDING
) == 0 ||
2244 (req
->rq_state
& RQ_LOCAL_ABORTED
) != 0);
2247 drbd_err(device
, "req=%p completion_ref=%d rq_state=%x\n",
2248 req
, atomic_read(&req
->completion_ref
),
2251 /* We still need to put one kref associated with the
2252 * "completion_ref" going zero in the code path that queued it
2253 * here. The request object may still be referenced by a
2254 * frozen local req->private_bio, in case we force-detached.
2256 kref_put(&req
->kref
, drbd_req_destroy
);
2258 /* A single suspended or otherwise blocking device may stall
2259 * all others as well. Fortunately, this code path is to
2260 * recover from a situation that "should not happen":
2261 * concurrent writes in multi-primary setup.
2262 * In a "normal" lifecycle, this workqueue is supposed to be
2263 * destroyed without ever doing anything.
2264 * If it turns out to be an issue anyways, we can do per
2265 * resource (replication group) or per device (minor) retry
2266 * workqueues instead.
2269 /* We are not just doing generic_make_request(),
2270 * as we want to keep the start_time information. */
2272 __drbd_make_request(device
, bio
, start_jif
);
2276 /* called via drbd_req_put_completion_ref(),
2277 * holds resource->req_lock */
2278 void drbd_restart_request(struct drbd_request
*req
)
2280 unsigned long flags
;
2281 spin_lock_irqsave(&retry
.lock
, flags
);
2282 list_move_tail(&req
->tl_requests
, &retry
.writes
);
2283 spin_unlock_irqrestore(&retry
.lock
, flags
);
2285 /* Drop the extra reference that would otherwise
2286 * have been dropped by complete_master_bio.
2287 * do_retry() needs to grab a new one. */
2288 dec_ap_bio(req
->device
);
2290 queue_work(retry
.wq
, &retry
.worker
);
2293 void drbd_destroy_resource(struct kref
*kref
)
2295 struct drbd_resource
*resource
=
2296 container_of(kref
, struct drbd_resource
, kref
);
2298 idr_destroy(&resource
->devices
);
2299 free_cpumask_var(resource
->cpu_mask
);
2300 kfree(resource
->name
);
2301 memset(resource
, 0xf2, sizeof(*resource
));
2305 void drbd_free_resource(struct drbd_resource
*resource
)
2307 struct drbd_connection
*connection
, *tmp
;
2309 for_each_connection_safe(connection
, tmp
, resource
) {
2310 list_del(&connection
->connections
);
2311 drbd_debugfs_connection_cleanup(connection
);
2312 kref_put(&connection
->kref
, drbd_destroy_connection
);
2314 drbd_debugfs_resource_cleanup(resource
);
2315 kref_put(&resource
->kref
, drbd_destroy_resource
);
2318 static void drbd_cleanup(void)
2321 struct drbd_device
*device
;
2322 struct drbd_resource
*resource
, *tmp
;
2324 /* first remove proc,
2325 * drbdsetup uses it's presence to detect
2326 * whether DRBD is loaded.
2327 * If we would get stuck in proc removal,
2328 * but have netlink already deregistered,
2329 * some drbdsetup commands may wait forever
2333 remove_proc_entry("drbd", NULL
);
2336 destroy_workqueue(retry
.wq
);
2338 drbd_genl_unregister();
2339 drbd_debugfs_cleanup();
2341 idr_for_each_entry(&drbd_devices
, device
, i
)
2342 drbd_delete_device(device
);
2344 /* not _rcu since, no other updater anymore. Genl already unregistered */
2345 for_each_resource_safe(resource
, tmp
, &drbd_resources
) {
2346 list_del(&resource
->resources
);
2347 drbd_free_resource(resource
);
2350 drbd_destroy_mempools();
2351 unregister_blkdev(DRBD_MAJOR
, "drbd");
2353 idr_destroy(&drbd_devices
);
2355 pr_info("module cleanup done.\n");
2359 * drbd_congested() - Callback for the flusher thread
2360 * @congested_data: User data
2361 * @bdi_bits: Bits the BDI flusher thread is currently interested in
2363 * Returns 1<<WB_async_congested and/or 1<<WB_sync_congested if we are congested.
2365 static int drbd_congested(void *congested_data
, int bdi_bits
)
2367 struct drbd_device
*device
= congested_data
;
2368 struct request_queue
*q
;
2372 if (!may_inc_ap_bio(device
)) {
2373 /* DRBD has frozen IO */
2379 if (test_bit(CALLBACK_PENDING
, &first_peer_device(device
)->connection
->flags
)) {
2380 r
|= (1 << WB_async_congested
);
2381 /* Without good local data, we would need to read from remote,
2382 * and that would need the worker thread as well, which is
2383 * currently blocked waiting for that usermode helper to
2386 if (!get_ldev_if_state(device
, D_UP_TO_DATE
))
2387 r
|= (1 << WB_sync_congested
);
2395 if (get_ldev(device
)) {
2396 q
= bdev_get_queue(device
->ldev
->backing_bdev
);
2397 r
= bdi_congested(&q
->backing_dev_info
, bdi_bits
);
2403 if (bdi_bits
& (1 << WB_async_congested
) &&
2404 test_bit(NET_CONGESTED
, &first_peer_device(device
)->connection
->flags
)) {
2405 r
|= (1 << WB_async_congested
);
2406 reason
= reason
== 'b' ? 'a' : 'n';
2410 device
->congestion_reason
= reason
;
2414 static void drbd_init_workqueue(struct drbd_work_queue
* wq
)
2416 spin_lock_init(&wq
->q_lock
);
2417 INIT_LIST_HEAD(&wq
->q
);
2418 init_waitqueue_head(&wq
->q_wait
);
2421 struct completion_work
{
2423 struct completion done
;
2426 static int w_complete(struct drbd_work
*w
, int cancel
)
2428 struct completion_work
*completion_work
=
2429 container_of(w
, struct completion_work
, w
);
2431 complete(&completion_work
->done
);
2435 void drbd_flush_workqueue(struct drbd_work_queue
*work_queue
)
2437 struct completion_work completion_work
;
2439 completion_work
.w
.cb
= w_complete
;
2440 init_completion(&completion_work
.done
);
2441 drbd_queue_work(work_queue
, &completion_work
.w
);
2442 wait_for_completion(&completion_work
.done
);
2445 struct drbd_resource
*drbd_find_resource(const char *name
)
2447 struct drbd_resource
*resource
;
2449 if (!name
|| !name
[0])
2453 for_each_resource_rcu(resource
, &drbd_resources
) {
2454 if (!strcmp(resource
->name
, name
)) {
2455 kref_get(&resource
->kref
);
2465 struct drbd_connection
*conn_get_by_addrs(void *my_addr
, int my_addr_len
,
2466 void *peer_addr
, int peer_addr_len
)
2468 struct drbd_resource
*resource
;
2469 struct drbd_connection
*connection
;
2472 for_each_resource_rcu(resource
, &drbd_resources
) {
2473 for_each_connection_rcu(connection
, resource
) {
2474 if (connection
->my_addr_len
== my_addr_len
&&
2475 connection
->peer_addr_len
== peer_addr_len
&&
2476 !memcmp(&connection
->my_addr
, my_addr
, my_addr_len
) &&
2477 !memcmp(&connection
->peer_addr
, peer_addr
, peer_addr_len
)) {
2478 kref_get(&connection
->kref
);
2489 static int drbd_alloc_socket(struct drbd_socket
*socket
)
2491 socket
->rbuf
= (void *) __get_free_page(GFP_KERNEL
);
2494 socket
->sbuf
= (void *) __get_free_page(GFP_KERNEL
);
2500 static void drbd_free_socket(struct drbd_socket
*socket
)
2502 free_page((unsigned long) socket
->sbuf
);
2503 free_page((unsigned long) socket
->rbuf
);
2506 void conn_free_crypto(struct drbd_connection
*connection
)
2508 drbd_free_sock(connection
);
2510 crypto_free_hash(connection
->csums_tfm
);
2511 crypto_free_hash(connection
->verify_tfm
);
2512 crypto_free_hash(connection
->cram_hmac_tfm
);
2513 crypto_free_hash(connection
->integrity_tfm
);
2514 crypto_free_hash(connection
->peer_integrity_tfm
);
2515 kfree(connection
->int_dig_in
);
2516 kfree(connection
->int_dig_vv
);
2518 connection
->csums_tfm
= NULL
;
2519 connection
->verify_tfm
= NULL
;
2520 connection
->cram_hmac_tfm
= NULL
;
2521 connection
->integrity_tfm
= NULL
;
2522 connection
->peer_integrity_tfm
= NULL
;
2523 connection
->int_dig_in
= NULL
;
2524 connection
->int_dig_vv
= NULL
;
2527 int set_resource_options(struct drbd_resource
*resource
, struct res_opts
*res_opts
)
2529 struct drbd_connection
*connection
;
2530 cpumask_var_t new_cpu_mask
;
2533 if (!zalloc_cpumask_var(&new_cpu_mask
, GFP_KERNEL
))
2536 /* silently ignore cpu mask on UP kernel */
2537 if (nr_cpu_ids
> 1 && res_opts
->cpu_mask
[0] != 0) {
2538 err
= bitmap_parse(res_opts
->cpu_mask
, DRBD_CPU_MASK_SIZE
,
2539 cpumask_bits(new_cpu_mask
), nr_cpu_ids
);
2540 if (err
== -EOVERFLOW
) {
2541 /* So what. mask it out. */
2542 cpumask_var_t tmp_cpu_mask
;
2543 if (zalloc_cpumask_var(&tmp_cpu_mask
, GFP_KERNEL
)) {
2544 cpumask_setall(tmp_cpu_mask
);
2545 cpumask_and(new_cpu_mask
, new_cpu_mask
, tmp_cpu_mask
);
2546 drbd_warn(resource
, "Overflow in bitmap_parse(%.12s%s), truncating to %u bits\n",
2548 strlen(res_opts
->cpu_mask
) > 12 ? "..." : "",
2550 free_cpumask_var(tmp_cpu_mask
);
2555 drbd_warn(resource
, "bitmap_parse() failed with %d\n", err
);
2556 /* retcode = ERR_CPU_MASK_PARSE; */
2560 resource
->res_opts
= *res_opts
;
2561 if (cpumask_empty(new_cpu_mask
))
2562 drbd_calc_cpu_mask(&new_cpu_mask
);
2563 if (!cpumask_equal(resource
->cpu_mask
, new_cpu_mask
)) {
2564 cpumask_copy(resource
->cpu_mask
, new_cpu_mask
);
2565 for_each_connection_rcu(connection
, resource
) {
2566 connection
->receiver
.reset_cpu_mask
= 1;
2567 connection
->asender
.reset_cpu_mask
= 1;
2568 connection
->worker
.reset_cpu_mask
= 1;
2574 free_cpumask_var(new_cpu_mask
);
2579 struct drbd_resource
*drbd_create_resource(const char *name
)
2581 struct drbd_resource
*resource
;
2583 resource
= kzalloc(sizeof(struct drbd_resource
), GFP_KERNEL
);
2586 resource
->name
= kstrdup(name
, GFP_KERNEL
);
2587 if (!resource
->name
)
2588 goto fail_free_resource
;
2589 if (!zalloc_cpumask_var(&resource
->cpu_mask
, GFP_KERNEL
))
2590 goto fail_free_name
;
2591 kref_init(&resource
->kref
);
2592 idr_init(&resource
->devices
);
2593 INIT_LIST_HEAD(&resource
->connections
);
2594 resource
->write_ordering
= WO_BDEV_FLUSH
;
2595 list_add_tail_rcu(&resource
->resources
, &drbd_resources
);
2596 mutex_init(&resource
->conf_update
);
2597 mutex_init(&resource
->adm_mutex
);
2598 spin_lock_init(&resource
->req_lock
);
2599 drbd_debugfs_resource_add(resource
);
2603 kfree(resource
->name
);
2610 /* caller must be under adm_mutex */
2611 struct drbd_connection
*conn_create(const char *name
, struct res_opts
*res_opts
)
2613 struct drbd_resource
*resource
;
2614 struct drbd_connection
*connection
;
2616 connection
= kzalloc(sizeof(struct drbd_connection
), GFP_KERNEL
);
2620 if (drbd_alloc_socket(&connection
->data
))
2622 if (drbd_alloc_socket(&connection
->meta
))
2625 connection
->current_epoch
= kzalloc(sizeof(struct drbd_epoch
), GFP_KERNEL
);
2626 if (!connection
->current_epoch
)
2629 INIT_LIST_HEAD(&connection
->transfer_log
);
2631 INIT_LIST_HEAD(&connection
->current_epoch
->list
);
2632 connection
->epochs
= 1;
2633 spin_lock_init(&connection
->epoch_lock
);
2635 connection
->send
.seen_any_write_yet
= false;
2636 connection
->send
.current_epoch_nr
= 0;
2637 connection
->send
.current_epoch_writes
= 0;
2639 resource
= drbd_create_resource(name
);
2643 connection
->cstate
= C_STANDALONE
;
2644 mutex_init(&connection
->cstate_mutex
);
2645 init_waitqueue_head(&connection
->ping_wait
);
2646 idr_init(&connection
->peer_devices
);
2648 drbd_init_workqueue(&connection
->sender_work
);
2649 mutex_init(&connection
->data
.mutex
);
2650 mutex_init(&connection
->meta
.mutex
);
2652 drbd_thread_init(resource
, &connection
->receiver
, drbd_receiver
, "receiver");
2653 connection
->receiver
.connection
= connection
;
2654 drbd_thread_init(resource
, &connection
->worker
, drbd_worker
, "worker");
2655 connection
->worker
.connection
= connection
;
2656 drbd_thread_init(resource
, &connection
->asender
, drbd_asender
, "asender");
2657 connection
->asender
.connection
= connection
;
2659 kref_init(&connection
->kref
);
2661 connection
->resource
= resource
;
2663 if (set_resource_options(resource
, res_opts
))
2666 kref_get(&resource
->kref
);
2667 list_add_tail_rcu(&connection
->connections
, &resource
->connections
);
2668 drbd_debugfs_connection_add(connection
);
2672 list_del(&resource
->resources
);
2673 drbd_free_resource(resource
);
2675 kfree(connection
->current_epoch
);
2676 drbd_free_socket(&connection
->meta
);
2677 drbd_free_socket(&connection
->data
);
2682 void drbd_destroy_connection(struct kref
*kref
)
2684 struct drbd_connection
*connection
= container_of(kref
, struct drbd_connection
, kref
);
2685 struct drbd_resource
*resource
= connection
->resource
;
2687 if (atomic_read(&connection
->current_epoch
->epoch_size
) != 0)
2688 drbd_err(connection
, "epoch_size:%d\n", atomic_read(&connection
->current_epoch
->epoch_size
));
2689 kfree(connection
->current_epoch
);
2691 idr_destroy(&connection
->peer_devices
);
2693 drbd_free_socket(&connection
->meta
);
2694 drbd_free_socket(&connection
->data
);
2695 kfree(connection
->int_dig_in
);
2696 kfree(connection
->int_dig_vv
);
2697 memset(connection
, 0xfc, sizeof(*connection
));
2699 kref_put(&resource
->kref
, drbd_destroy_resource
);
2702 static int init_submitter(struct drbd_device
*device
)
2704 /* opencoded create_singlethread_workqueue(),
2705 * to be able to say "drbd%d", ..., minor */
2706 device
->submit
.wq
= alloc_workqueue("drbd%u_submit",
2707 WQ_UNBOUND
| WQ_MEM_RECLAIM
, 1, device
->minor
);
2708 if (!device
->submit
.wq
)
2711 INIT_WORK(&device
->submit
.worker
, do_submit
);
2712 INIT_LIST_HEAD(&device
->submit
.writes
);
2716 enum drbd_ret_code
drbd_create_device(struct drbd_config_context
*adm_ctx
, unsigned int minor
)
2718 struct drbd_resource
*resource
= adm_ctx
->resource
;
2719 struct drbd_connection
*connection
;
2720 struct drbd_device
*device
;
2721 struct drbd_peer_device
*peer_device
, *tmp_peer_device
;
2722 struct gendisk
*disk
;
2723 struct request_queue
*q
;
2725 int vnr
= adm_ctx
->volume
;
2726 enum drbd_ret_code err
= ERR_NOMEM
;
2728 device
= minor_to_device(minor
);
2730 return ERR_MINOR_OR_VOLUME_EXISTS
;
2732 /* GFP_KERNEL, we are outside of all write-out paths */
2733 device
= kzalloc(sizeof(struct drbd_device
), GFP_KERNEL
);
2736 kref_init(&device
->kref
);
2738 kref_get(&resource
->kref
);
2739 device
->resource
= resource
;
2740 device
->minor
= minor
;
2743 drbd_init_set_defaults(device
);
2745 q
= blk_alloc_queue(GFP_KERNEL
);
2748 device
->rq_queue
= q
;
2749 q
->queuedata
= device
;
2751 disk
= alloc_disk(1);
2754 device
->vdisk
= disk
;
2756 set_disk_ro(disk
, true);
2759 disk
->major
= DRBD_MAJOR
;
2760 disk
->first_minor
= minor
;
2761 disk
->fops
= &drbd_ops
;
2762 sprintf(disk
->disk_name
, "drbd%d", minor
);
2763 disk
->private_data
= device
;
2765 device
->this_bdev
= bdget(MKDEV(DRBD_MAJOR
, minor
));
2766 /* we have no partitions. we contain only ourselves. */
2767 device
->this_bdev
->bd_contains
= device
->this_bdev
;
2769 q
->backing_dev_info
.congested_fn
= drbd_congested
;
2770 q
->backing_dev_info
.congested_data
= device
;
2772 blk_queue_make_request(q
, drbd_make_request
);
2773 blk_queue_flush(q
, REQ_FLUSH
| REQ_FUA
);
2774 /* Setting the max_hw_sectors to an odd value of 8kibyte here
2775 This triggers a max_bio_size message upon first attach or connect */
2776 blk_queue_max_hw_sectors(q
, DRBD_MAX_BIO_SIZE_SAFE
>> 8);
2777 blk_queue_bounce_limit(q
, BLK_BOUNCE_ANY
);
2778 q
->queue_lock
= &resource
->req_lock
;
2780 device
->md_io
.page
= alloc_page(GFP_KERNEL
);
2781 if (!device
->md_io
.page
)
2782 goto out_no_io_page
;
2784 if (drbd_bm_init(device
))
2786 device
->read_requests
= RB_ROOT
;
2787 device
->write_requests
= RB_ROOT
;
2789 id
= idr_alloc(&drbd_devices
, device
, minor
, minor
+ 1, GFP_KERNEL
);
2792 err
= ERR_MINOR_OR_VOLUME_EXISTS
;
2793 goto out_no_minor_idr
;
2795 kref_get(&device
->kref
);
2797 id
= idr_alloc(&resource
->devices
, device
, vnr
, vnr
+ 1, GFP_KERNEL
);
2800 err
= ERR_MINOR_OR_VOLUME_EXISTS
;
2801 goto out_idr_remove_minor
;
2803 kref_get(&device
->kref
);
2805 INIT_LIST_HEAD(&device
->peer_devices
);
2806 INIT_LIST_HEAD(&device
->pending_bitmap_io
);
2807 for_each_connection(connection
, resource
) {
2808 peer_device
= kzalloc(sizeof(struct drbd_peer_device
), GFP_KERNEL
);
2810 goto out_idr_remove_from_resource
;
2811 peer_device
->connection
= connection
;
2812 peer_device
->device
= device
;
2814 list_add(&peer_device
->peer_devices
, &device
->peer_devices
);
2815 kref_get(&device
->kref
);
2817 id
= idr_alloc(&connection
->peer_devices
, peer_device
, vnr
, vnr
+ 1, GFP_KERNEL
);
2820 err
= ERR_INVALID_REQUEST
;
2821 goto out_idr_remove_from_resource
;
2823 kref_get(&connection
->kref
);
2826 if (init_submitter(device
)) {
2828 goto out_idr_remove_vol
;
2833 /* inherit the connection state */
2834 device
->state
.conn
= first_connection(resource
)->cstate
;
2835 if (device
->state
.conn
== C_WF_REPORT_PARAMS
) {
2836 for_each_peer_device(peer_device
, device
)
2837 drbd_connected(peer_device
);
2839 /* move to create_peer_device() */
2840 for_each_peer_device(peer_device
, device
)
2841 drbd_debugfs_peer_device_add(peer_device
);
2842 drbd_debugfs_device_add(device
);
2846 idr_remove(&connection
->peer_devices
, vnr
);
2847 out_idr_remove_from_resource
:
2848 for_each_connection(connection
, resource
) {
2849 peer_device
= idr_find(&connection
->peer_devices
, vnr
);
2851 idr_remove(&connection
->peer_devices
, vnr
);
2852 kref_put(&connection
->kref
, drbd_destroy_connection
);
2855 for_each_peer_device_safe(peer_device
, tmp_peer_device
, device
) {
2856 list_del(&peer_device
->peer_devices
);
2859 idr_remove(&resource
->devices
, vnr
);
2860 out_idr_remove_minor
:
2861 idr_remove(&drbd_devices
, minor
);
2864 drbd_bm_cleanup(device
);
2866 __free_page(device
->md_io
.page
);
2870 blk_cleanup_queue(q
);
2872 kref_put(&resource
->kref
, drbd_destroy_resource
);
2877 void drbd_delete_device(struct drbd_device
*device
)
2879 struct drbd_resource
*resource
= device
->resource
;
2880 struct drbd_connection
*connection
;
2881 struct drbd_peer_device
*peer_device
;
2884 /* move to free_peer_device() */
2885 for_each_peer_device(peer_device
, device
)
2886 drbd_debugfs_peer_device_cleanup(peer_device
);
2887 drbd_debugfs_device_cleanup(device
);
2888 for_each_connection(connection
, resource
) {
2889 idr_remove(&connection
->peer_devices
, device
->vnr
);
2892 idr_remove(&resource
->devices
, device
->vnr
);
2893 idr_remove(&drbd_devices
, device_to_minor(device
));
2894 del_gendisk(device
->vdisk
);
2896 kref_sub(&device
->kref
, refs
, drbd_destroy_device
);
2899 static int __init
drbd_init(void)
2903 if (minor_count
< DRBD_MINOR_COUNT_MIN
|| minor_count
> DRBD_MINOR_COUNT_MAX
) {
2904 pr_err("invalid minor_count (%d)\n", minor_count
);
2908 minor_count
= DRBD_MINOR_COUNT_DEF
;
2912 err
= register_blkdev(DRBD_MAJOR
, "drbd");
2914 pr_err("unable to register block device major %d\n",
2920 * allocate all necessary structs
2922 init_waitqueue_head(&drbd_pp_wait
);
2924 drbd_proc
= NULL
; /* play safe for drbd_cleanup */
2925 idr_init(&drbd_devices
);
2927 mutex_init(&resources_mutex
);
2928 INIT_LIST_HEAD(&drbd_resources
);
2930 err
= drbd_genl_register();
2932 pr_err("unable to register generic netlink family\n");
2936 err
= drbd_create_mempools();
2941 drbd_proc
= proc_create_data("drbd", S_IFREG
| S_IRUGO
, NULL
, &drbd_proc_fops
, NULL
);
2943 pr_err("unable to register proc file\n");
2947 retry
.wq
= create_singlethread_workqueue("drbd-reissue");
2949 pr_err("unable to create retry workqueue\n");
2952 INIT_WORK(&retry
.worker
, do_retry
);
2953 spin_lock_init(&retry
.lock
);
2954 INIT_LIST_HEAD(&retry
.writes
);
2956 if (drbd_debugfs_init())
2957 pr_notice("failed to initialize debugfs -- will not be available\n");
2959 pr_info("initialized. "
2960 "Version: " REL_VERSION
" (api:%d/proto:%d-%d)\n",
2961 API_VERSION
, PRO_VERSION_MIN
, PRO_VERSION_MAX
);
2962 pr_info("%s\n", drbd_buildtag());
2963 pr_info("registered as block device major %d\n", DRBD_MAJOR
);
2964 return 0; /* Success! */
2969 pr_err("ran out of memory\n");
2971 pr_err("initialization failure\n");
2975 void drbd_free_ldev(struct drbd_backing_dev
*ldev
)
2980 blkdev_put(ldev
->backing_bdev
, FMODE_READ
| FMODE_WRITE
| FMODE_EXCL
);
2981 blkdev_put(ldev
->md_bdev
, FMODE_READ
| FMODE_WRITE
| FMODE_EXCL
);
2983 kfree(ldev
->disk_conf
);
2987 static void drbd_free_one_sock(struct drbd_socket
*ds
)
2990 mutex_lock(&ds
->mutex
);
2993 mutex_unlock(&ds
->mutex
);
2995 /* so debugfs does not need to mutex_lock() */
2997 kernel_sock_shutdown(s
, SHUT_RDWR
);
3002 void drbd_free_sock(struct drbd_connection
*connection
)
3004 if (connection
->data
.socket
)
3005 drbd_free_one_sock(&connection
->data
);
3006 if (connection
->meta
.socket
)
3007 drbd_free_one_sock(&connection
->meta
);
3010 /* meta data management */
3012 void conn_md_sync(struct drbd_connection
*connection
)
3014 struct drbd_peer_device
*peer_device
;
3018 idr_for_each_entry(&connection
->peer_devices
, peer_device
, vnr
) {
3019 struct drbd_device
*device
= peer_device
->device
;
3021 kref_get(&device
->kref
);
3023 drbd_md_sync(device
);
3024 kref_put(&device
->kref
, drbd_destroy_device
);
3030 /* aligned 4kByte */
3031 struct meta_data_on_disk
{
3032 u64 la_size_sect
; /* last agreed size. */
3033 u64 uuid
[UI_SIZE
]; /* UUIDs. */
3036 u32 flags
; /* MDF */
3039 u32 al_offset
; /* offset to this block */
3040 u32 al_nr_extents
; /* important for restoring the AL (userspace) */
3041 /* `-- act_log->nr_elements <-- ldev->dc.al_extents */
3042 u32 bm_offset
; /* offset to the bitmap, from here */
3043 u32 bm_bytes_per_bit
; /* BM_BLOCK_SIZE */
3044 u32 la_peer_max_bio_size
; /* last peer max_bio_size */
3046 /* see al_tr_number_to_on_disk_sector() */
3048 u32 al_stripe_size_4k
;
3050 u8 reserved_u8
[4096 - (7*8 + 10*4)];
3055 void drbd_md_write(struct drbd_device
*device
, void *b
)
3057 struct meta_data_on_disk
*buffer
= b
;
3061 memset(buffer
, 0, sizeof(*buffer
));
3063 buffer
->la_size_sect
= cpu_to_be64(drbd_get_capacity(device
->this_bdev
));
3064 for (i
= UI_CURRENT
; i
< UI_SIZE
; i
++)
3065 buffer
->uuid
[i
] = cpu_to_be64(device
->ldev
->md
.uuid
[i
]);
3066 buffer
->flags
= cpu_to_be32(device
->ldev
->md
.flags
);
3067 buffer
->magic
= cpu_to_be32(DRBD_MD_MAGIC_84_UNCLEAN
);
3069 buffer
->md_size_sect
= cpu_to_be32(device
->ldev
->md
.md_size_sect
);
3070 buffer
->al_offset
= cpu_to_be32(device
->ldev
->md
.al_offset
);
3071 buffer
->al_nr_extents
= cpu_to_be32(device
->act_log
->nr_elements
);
3072 buffer
->bm_bytes_per_bit
= cpu_to_be32(BM_BLOCK_SIZE
);
3073 buffer
->device_uuid
= cpu_to_be64(device
->ldev
->md
.device_uuid
);
3075 buffer
->bm_offset
= cpu_to_be32(device
->ldev
->md
.bm_offset
);
3076 buffer
->la_peer_max_bio_size
= cpu_to_be32(device
->peer_max_bio_size
);
3078 buffer
->al_stripes
= cpu_to_be32(device
->ldev
->md
.al_stripes
);
3079 buffer
->al_stripe_size_4k
= cpu_to_be32(device
->ldev
->md
.al_stripe_size_4k
);
3081 D_ASSERT(device
, drbd_md_ss(device
->ldev
) == device
->ldev
->md
.md_offset
);
3082 sector
= device
->ldev
->md
.md_offset
;
3084 if (drbd_md_sync_page_io(device
, device
->ldev
, sector
, WRITE
)) {
3085 /* this was a try anyways ... */
3086 drbd_err(device
, "meta data update failed!\n");
3087 drbd_chk_io_error(device
, 1, DRBD_META_IO_ERROR
);
3092 * drbd_md_sync() - Writes the meta data super block if the MD_DIRTY flag bit is set
3093 * @device: DRBD device.
3095 void drbd_md_sync(struct drbd_device
*device
)
3097 struct meta_data_on_disk
*buffer
;
3099 /* Don't accidentally change the DRBD meta data layout. */
3100 BUILD_BUG_ON(UI_SIZE
!= 4);
3101 BUILD_BUG_ON(sizeof(struct meta_data_on_disk
) != 4096);
3103 del_timer(&device
->md_sync_timer
);
3104 /* timer may be rearmed by drbd_md_mark_dirty() now. */
3105 if (!test_and_clear_bit(MD_DIRTY
, &device
->flags
))
3108 /* We use here D_FAILED and not D_ATTACHING because we try to write
3109 * metadata even if we detach due to a disk failure! */
3110 if (!get_ldev_if_state(device
, D_FAILED
))
3113 buffer
= drbd_md_get_buffer(device
, __func__
);
3117 drbd_md_write(device
, buffer
);
3119 /* Update device->ldev->md.la_size_sect,
3120 * since we updated it on metadata. */
3121 device
->ldev
->md
.la_size_sect
= drbd_get_capacity(device
->this_bdev
);
3123 drbd_md_put_buffer(device
);
3128 static int check_activity_log_stripe_size(struct drbd_device
*device
,
3129 struct meta_data_on_disk
*on_disk
,
3130 struct drbd_md
*in_core
)
3132 u32 al_stripes
= be32_to_cpu(on_disk
->al_stripes
);
3133 u32 al_stripe_size_4k
= be32_to_cpu(on_disk
->al_stripe_size_4k
);
3136 /* both not set: default to old fixed size activity log */
3137 if (al_stripes
== 0 && al_stripe_size_4k
== 0) {
3139 al_stripe_size_4k
= MD_32kB_SECT
/8;
3142 /* some paranoia plausibility checks */
3144 /* we need both values to be set */
3145 if (al_stripes
== 0 || al_stripe_size_4k
== 0)
3148 al_size_4k
= (u64
)al_stripes
* al_stripe_size_4k
;
3150 /* Upper limit of activity log area, to avoid potential overflow
3151 * problems in al_tr_number_to_on_disk_sector(). As right now, more
3152 * than 72 * 4k blocks total only increases the amount of history,
3153 * limiting this arbitrarily to 16 GB is not a real limitation ;-) */
3154 if (al_size_4k
> (16 * 1024 * 1024/4))
3157 /* Lower limit: we need at least 8 transaction slots (32kB)
3158 * to not break existing setups */
3159 if (al_size_4k
< MD_32kB_SECT
/8)
3162 in_core
->al_stripe_size_4k
= al_stripe_size_4k
;
3163 in_core
->al_stripes
= al_stripes
;
3164 in_core
->al_size_4k
= al_size_4k
;
3168 drbd_err(device
, "invalid activity log striping: al_stripes=%u, al_stripe_size_4k=%u\n",
3169 al_stripes
, al_stripe_size_4k
);
3173 static int check_offsets_and_sizes(struct drbd_device
*device
, struct drbd_backing_dev
*bdev
)
3175 sector_t capacity
= drbd_get_capacity(bdev
->md_bdev
);
3176 struct drbd_md
*in_core
= &bdev
->md
;
3177 s32 on_disk_al_sect
;
3178 s32 on_disk_bm_sect
;
3180 /* The on-disk size of the activity log, calculated from offsets, and
3181 * the size of the activity log calculated from the stripe settings,
3183 * Though we could relax this a bit: it is ok, if the striped activity log
3184 * fits in the available on-disk activity log size.
3185 * Right now, that would break how resize is implemented.
3186 * TODO: make drbd_determine_dev_size() (and the drbdmeta tool) aware
3187 * of possible unused padding space in the on disk layout. */
3188 if (in_core
->al_offset
< 0) {
3189 if (in_core
->bm_offset
> in_core
->al_offset
)
3191 on_disk_al_sect
= -in_core
->al_offset
;
3192 on_disk_bm_sect
= in_core
->al_offset
- in_core
->bm_offset
;
3194 if (in_core
->al_offset
!= MD_4kB_SECT
)
3196 if (in_core
->bm_offset
< in_core
->al_offset
+ in_core
->al_size_4k
* MD_4kB_SECT
)
3199 on_disk_al_sect
= in_core
->bm_offset
- MD_4kB_SECT
;
3200 on_disk_bm_sect
= in_core
->md_size_sect
- in_core
->bm_offset
;
3203 /* old fixed size meta data is exactly that: fixed. */
3204 if (in_core
->meta_dev_idx
>= 0) {
3205 if (in_core
->md_size_sect
!= MD_128MB_SECT
3206 || in_core
->al_offset
!= MD_4kB_SECT
3207 || in_core
->bm_offset
!= MD_4kB_SECT
+ MD_32kB_SECT
3208 || in_core
->al_stripes
!= 1
3209 || in_core
->al_stripe_size_4k
!= MD_32kB_SECT
/8)
3213 if (capacity
< in_core
->md_size_sect
)
3215 if (capacity
- in_core
->md_size_sect
< drbd_md_first_sector(bdev
))
3218 /* should be aligned, and at least 32k */
3219 if ((on_disk_al_sect
& 7) || (on_disk_al_sect
< MD_32kB_SECT
))
3222 /* should fit (for now: exactly) into the available on-disk space;
3223 * overflow prevention is in check_activity_log_stripe_size() above. */
3224 if (on_disk_al_sect
!= in_core
->al_size_4k
* MD_4kB_SECT
)
3227 /* again, should be aligned */
3228 if (in_core
->bm_offset
& 7)
3231 /* FIXME check for device grow with flex external meta data? */
3233 /* can the available bitmap space cover the last agreed device size? */
3234 if (on_disk_bm_sect
< (in_core
->la_size_sect
+7)/MD_4kB_SECT
/8/512)
3240 drbd_err(device
, "meta data offsets don't make sense: idx=%d "
3241 "al_s=%u, al_sz4k=%u, al_offset=%d, bm_offset=%d, "
3242 "md_size_sect=%u, la_size=%llu, md_capacity=%llu\n",
3243 in_core
->meta_dev_idx
,
3244 in_core
->al_stripes
, in_core
->al_stripe_size_4k
,
3245 in_core
->al_offset
, in_core
->bm_offset
, in_core
->md_size_sect
,
3246 (unsigned long long)in_core
->la_size_sect
,
3247 (unsigned long long)capacity
);
3254 * drbd_md_read() - Reads in the meta data super block
3255 * @device: DRBD device.
3256 * @bdev: Device from which the meta data should be read in.
3258 * Return NO_ERROR on success, and an enum drbd_ret_code in case
3259 * something goes wrong.
3261 * Called exactly once during drbd_adm_attach(), while still being D_DISKLESS,
3262 * even before @bdev is assigned to @device->ldev.
3264 int drbd_md_read(struct drbd_device
*device
, struct drbd_backing_dev
*bdev
)
3266 struct meta_data_on_disk
*buffer
;
3268 int i
, rv
= NO_ERROR
;
3270 if (device
->state
.disk
!= D_DISKLESS
)
3271 return ERR_DISK_CONFIGURED
;
3273 buffer
= drbd_md_get_buffer(device
, __func__
);
3277 /* First, figure out where our meta data superblock is located,
3279 bdev
->md
.meta_dev_idx
= bdev
->disk_conf
->meta_dev_idx
;
3280 bdev
->md
.md_offset
= drbd_md_ss(bdev
);
3282 if (drbd_md_sync_page_io(device
, bdev
, bdev
->md
.md_offset
, READ
)) {
3283 /* NOTE: can't do normal error processing here as this is
3284 called BEFORE disk is attached */
3285 drbd_err(device
, "Error while reading metadata.\n");
3286 rv
= ERR_IO_MD_DISK
;
3290 magic
= be32_to_cpu(buffer
->magic
);
3291 flags
= be32_to_cpu(buffer
->flags
);
3292 if (magic
== DRBD_MD_MAGIC_84_UNCLEAN
||
3293 (magic
== DRBD_MD_MAGIC_08
&& !(flags
& MDF_AL_CLEAN
))) {
3294 /* btw: that's Activity Log clean, not "all" clean. */
3295 drbd_err(device
, "Found unclean meta data. Did you \"drbdadm apply-al\"?\n");
3296 rv
= ERR_MD_UNCLEAN
;
3300 rv
= ERR_MD_INVALID
;
3301 if (magic
!= DRBD_MD_MAGIC_08
) {
3302 if (magic
== DRBD_MD_MAGIC_07
)
3303 drbd_err(device
, "Found old (0.7) meta data magic. Did you \"drbdadm create-md\"?\n");
3305 drbd_err(device
, "Meta data magic not found. Did you \"drbdadm create-md\"?\n");
3309 if (be32_to_cpu(buffer
->bm_bytes_per_bit
) != BM_BLOCK_SIZE
) {
3310 drbd_err(device
, "unexpected bm_bytes_per_bit: %u (expected %u)\n",
3311 be32_to_cpu(buffer
->bm_bytes_per_bit
), BM_BLOCK_SIZE
);
3316 /* convert to in_core endian */
3317 bdev
->md
.la_size_sect
= be64_to_cpu(buffer
->la_size_sect
);
3318 for (i
= UI_CURRENT
; i
< UI_SIZE
; i
++)
3319 bdev
->md
.uuid
[i
] = be64_to_cpu(buffer
->uuid
[i
]);
3320 bdev
->md
.flags
= be32_to_cpu(buffer
->flags
);
3321 bdev
->md
.device_uuid
= be64_to_cpu(buffer
->device_uuid
);
3323 bdev
->md
.md_size_sect
= be32_to_cpu(buffer
->md_size_sect
);
3324 bdev
->md
.al_offset
= be32_to_cpu(buffer
->al_offset
);
3325 bdev
->md
.bm_offset
= be32_to_cpu(buffer
->bm_offset
);
3327 if (check_activity_log_stripe_size(device
, buffer
, &bdev
->md
))
3329 if (check_offsets_and_sizes(device
, bdev
))
3332 if (be32_to_cpu(buffer
->bm_offset
) != bdev
->md
.bm_offset
) {
3333 drbd_err(device
, "unexpected bm_offset: %d (expected %d)\n",
3334 be32_to_cpu(buffer
->bm_offset
), bdev
->md
.bm_offset
);
3337 if (be32_to_cpu(buffer
->md_size_sect
) != bdev
->md
.md_size_sect
) {
3338 drbd_err(device
, "unexpected md_size: %u (expected %u)\n",
3339 be32_to_cpu(buffer
->md_size_sect
), bdev
->md
.md_size_sect
);
3345 spin_lock_irq(&device
->resource
->req_lock
);
3346 if (device
->state
.conn
< C_CONNECTED
) {
3348 peer
= be32_to_cpu(buffer
->la_peer_max_bio_size
);
3349 peer
= max(peer
, DRBD_MAX_BIO_SIZE_SAFE
);
3350 device
->peer_max_bio_size
= peer
;
3352 spin_unlock_irq(&device
->resource
->req_lock
);
3355 drbd_md_put_buffer(device
);
3361 * drbd_md_mark_dirty() - Mark meta data super block as dirty
3362 * @device: DRBD device.
3364 * Call this function if you change anything that should be written to
3365 * the meta-data super block. This function sets MD_DIRTY, and starts a
3366 * timer that ensures that within five seconds you have to call drbd_md_sync().
3369 void drbd_md_mark_dirty_(struct drbd_device
*device
, unsigned int line
, const char *func
)
3371 if (!test_and_set_bit(MD_DIRTY
, &device
->flags
)) {
3372 mod_timer(&device
->md_sync_timer
, jiffies
+ HZ
);
3373 device
->last_md_mark_dirty
.line
= line
;
3374 device
->last_md_mark_dirty
.func
= func
;
3378 void drbd_md_mark_dirty(struct drbd_device
*device
)
3380 if (!test_and_set_bit(MD_DIRTY
, &device
->flags
))
3381 mod_timer(&device
->md_sync_timer
, jiffies
+ 5*HZ
);
3385 void drbd_uuid_move_history(struct drbd_device
*device
) __must_hold(local
)
3389 for (i
= UI_HISTORY_START
; i
< UI_HISTORY_END
; i
++)
3390 device
->ldev
->md
.uuid
[i
+1] = device
->ldev
->md
.uuid
[i
];
3393 void __drbd_uuid_set(struct drbd_device
*device
, int idx
, u64 val
) __must_hold(local
)
3395 if (idx
== UI_CURRENT
) {
3396 if (device
->state
.role
== R_PRIMARY
)
3401 drbd_set_ed_uuid(device
, val
);
3404 device
->ldev
->md
.uuid
[idx
] = val
;
3405 drbd_md_mark_dirty(device
);
3408 void _drbd_uuid_set(struct drbd_device
*device
, int idx
, u64 val
) __must_hold(local
)
3410 unsigned long flags
;
3411 spin_lock_irqsave(&device
->ldev
->md
.uuid_lock
, flags
);
3412 __drbd_uuid_set(device
, idx
, val
);
3413 spin_unlock_irqrestore(&device
->ldev
->md
.uuid_lock
, flags
);
3416 void drbd_uuid_set(struct drbd_device
*device
, int idx
, u64 val
) __must_hold(local
)
3418 unsigned long flags
;
3419 spin_lock_irqsave(&device
->ldev
->md
.uuid_lock
, flags
);
3420 if (device
->ldev
->md
.uuid
[idx
]) {
3421 drbd_uuid_move_history(device
);
3422 device
->ldev
->md
.uuid
[UI_HISTORY_START
] = device
->ldev
->md
.uuid
[idx
];
3424 __drbd_uuid_set(device
, idx
, val
);
3425 spin_unlock_irqrestore(&device
->ldev
->md
.uuid_lock
, flags
);
3429 * drbd_uuid_new_current() - Creates a new current UUID
3430 * @device: DRBD device.
3432 * Creates a new current UUID, and rotates the old current UUID into
3433 * the bitmap slot. Causes an incremental resync upon next connect.
3435 void drbd_uuid_new_current(struct drbd_device
*device
) __must_hold(local
)
3438 unsigned long long bm_uuid
;
3440 get_random_bytes(&val
, sizeof(u64
));
3442 spin_lock_irq(&device
->ldev
->md
.uuid_lock
);
3443 bm_uuid
= device
->ldev
->md
.uuid
[UI_BITMAP
];
3446 drbd_warn(device
, "bm UUID was already set: %llX\n", bm_uuid
);
3448 device
->ldev
->md
.uuid
[UI_BITMAP
] = device
->ldev
->md
.uuid
[UI_CURRENT
];
3449 __drbd_uuid_set(device
, UI_CURRENT
, val
);
3450 spin_unlock_irq(&device
->ldev
->md
.uuid_lock
);
3452 drbd_print_uuids(device
, "new current UUID");
3453 /* get it to stable storage _now_ */
3454 drbd_md_sync(device
);
3457 void drbd_uuid_set_bm(struct drbd_device
*device
, u64 val
) __must_hold(local
)
3459 unsigned long flags
;
3460 if (device
->ldev
->md
.uuid
[UI_BITMAP
] == 0 && val
== 0)
3463 spin_lock_irqsave(&device
->ldev
->md
.uuid_lock
, flags
);
3465 drbd_uuid_move_history(device
);
3466 device
->ldev
->md
.uuid
[UI_HISTORY_START
] = device
->ldev
->md
.uuid
[UI_BITMAP
];
3467 device
->ldev
->md
.uuid
[UI_BITMAP
] = 0;
3469 unsigned long long bm_uuid
= device
->ldev
->md
.uuid
[UI_BITMAP
];
3471 drbd_warn(device
, "bm UUID was already set: %llX\n", bm_uuid
);
3473 device
->ldev
->md
.uuid
[UI_BITMAP
] = val
& ~((u64
)1);
3475 spin_unlock_irqrestore(&device
->ldev
->md
.uuid_lock
, flags
);
3477 drbd_md_mark_dirty(device
);
3481 * drbd_bmio_set_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
3482 * @device: DRBD device.
3484 * Sets all bits in the bitmap and writes the whole bitmap to stable storage.
3486 int drbd_bmio_set_n_write(struct drbd_device
*device
) __must_hold(local
)
3490 drbd_md_set_flag(device
, MDF_FULL_SYNC
);
3491 drbd_md_sync(device
);
3492 drbd_bm_set_all(device
);
3494 rv
= drbd_bm_write(device
);
3497 drbd_md_clear_flag(device
, MDF_FULL_SYNC
);
3498 drbd_md_sync(device
);
3505 * drbd_bmio_clear_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
3506 * @device: DRBD device.
3508 * Clears all bits in the bitmap and writes the whole bitmap to stable storage.
3510 int drbd_bmio_clear_n_write(struct drbd_device
*device
) __must_hold(local
)
3512 drbd_resume_al(device
);
3513 drbd_bm_clear_all(device
);
3514 return drbd_bm_write(device
);
3517 static int w_bitmap_io(struct drbd_work
*w
, int unused
)
3519 struct drbd_device
*device
=
3520 container_of(w
, struct drbd_device
, bm_io_work
.w
);
3521 struct bm_io_work
*work
= &device
->bm_io_work
;
3524 D_ASSERT(device
, atomic_read(&device
->ap_bio_cnt
) == 0);
3526 if (get_ldev(device
)) {
3527 drbd_bm_lock(device
, work
->why
, work
->flags
);
3528 rv
= work
->io_fn(device
);
3529 drbd_bm_unlock(device
);
3533 clear_bit_unlock(BITMAP_IO
, &device
->flags
);
3534 wake_up(&device
->misc_wait
);
3537 work
->done(device
, rv
);
3539 clear_bit(BITMAP_IO_QUEUED
, &device
->flags
);
3547 * drbd_queue_bitmap_io() - Queues an IO operation on the whole bitmap
3548 * @device: DRBD device.
3549 * @io_fn: IO callback to be called when bitmap IO is possible
3550 * @done: callback to be called after the bitmap IO was performed
3551 * @why: Descriptive text of the reason for doing the IO
3553 * While IO on the bitmap happens we freeze application IO thus we ensure
3554 * that drbd_set_out_of_sync() can not be called. This function MAY ONLY be
3555 * called from worker context. It MUST NOT be used while a previous such
3556 * work is still pending!
3558 * Its worker function encloses the call of io_fn() by get_ldev() and
3561 void drbd_queue_bitmap_io(struct drbd_device
*device
,
3562 int (*io_fn
)(struct drbd_device
*),
3563 void (*done
)(struct drbd_device
*, int),
3564 char *why
, enum bm_flag flags
)
3566 D_ASSERT(device
, current
== first_peer_device(device
)->connection
->worker
.task
);
3568 D_ASSERT(device
, !test_bit(BITMAP_IO_QUEUED
, &device
->flags
));
3569 D_ASSERT(device
, !test_bit(BITMAP_IO
, &device
->flags
));
3570 D_ASSERT(device
, list_empty(&device
->bm_io_work
.w
.list
));
3571 if (device
->bm_io_work
.why
)
3572 drbd_err(device
, "FIXME going to queue '%s' but '%s' still pending?\n",
3573 why
, device
->bm_io_work
.why
);
3575 device
->bm_io_work
.io_fn
= io_fn
;
3576 device
->bm_io_work
.done
= done
;
3577 device
->bm_io_work
.why
= why
;
3578 device
->bm_io_work
.flags
= flags
;
3580 spin_lock_irq(&device
->resource
->req_lock
);
3581 set_bit(BITMAP_IO
, &device
->flags
);
3582 if (atomic_read(&device
->ap_bio_cnt
) == 0) {
3583 if (!test_and_set_bit(BITMAP_IO_QUEUED
, &device
->flags
))
3584 drbd_queue_work(&first_peer_device(device
)->connection
->sender_work
,
3585 &device
->bm_io_work
.w
);
3587 spin_unlock_irq(&device
->resource
->req_lock
);
3591 * drbd_bitmap_io() - Does an IO operation on the whole bitmap
3592 * @device: DRBD device.
3593 * @io_fn: IO callback to be called when bitmap IO is possible
3594 * @why: Descriptive text of the reason for doing the IO
3596 * freezes application IO while that the actual IO operations runs. This
3597 * functions MAY NOT be called from worker context.
3599 int drbd_bitmap_io(struct drbd_device
*device
, int (*io_fn
)(struct drbd_device
*),
3600 char *why
, enum bm_flag flags
)
3604 D_ASSERT(device
, current
!= first_peer_device(device
)->connection
->worker
.task
);
3606 if ((flags
& BM_LOCKED_SET_ALLOWED
) == 0)
3607 drbd_suspend_io(device
);
3609 drbd_bm_lock(device
, why
, flags
);
3611 drbd_bm_unlock(device
);
3613 if ((flags
& BM_LOCKED_SET_ALLOWED
) == 0)
3614 drbd_resume_io(device
);
3619 void drbd_md_set_flag(struct drbd_device
*device
, int flag
) __must_hold(local
)
3621 if ((device
->ldev
->md
.flags
& flag
) != flag
) {
3622 drbd_md_mark_dirty(device
);
3623 device
->ldev
->md
.flags
|= flag
;
3627 void drbd_md_clear_flag(struct drbd_device
*device
, int flag
) __must_hold(local
)
3629 if ((device
->ldev
->md
.flags
& flag
) != 0) {
3630 drbd_md_mark_dirty(device
);
3631 device
->ldev
->md
.flags
&= ~flag
;
3634 int drbd_md_test_flag(struct drbd_backing_dev
*bdev
, int flag
)
3636 return (bdev
->md
.flags
& flag
) != 0;
3639 static void md_sync_timer_fn(unsigned long data
)
3641 struct drbd_device
*device
= (struct drbd_device
*) data
;
3642 drbd_device_post_work(device
, MD_SYNC
);
3645 const char *cmdname(enum drbd_packet cmd
)
3647 /* THINK may need to become several global tables
3648 * when we want to support more than
3649 * one PRO_VERSION */
3650 static const char *cmdnames
[] = {
3652 [P_DATA_REPLY
] = "DataReply",
3653 [P_RS_DATA_REPLY
] = "RSDataReply",
3654 [P_BARRIER
] = "Barrier",
3655 [P_BITMAP
] = "ReportBitMap",
3656 [P_BECOME_SYNC_TARGET
] = "BecomeSyncTarget",
3657 [P_BECOME_SYNC_SOURCE
] = "BecomeSyncSource",
3658 [P_UNPLUG_REMOTE
] = "UnplugRemote",
3659 [P_DATA_REQUEST
] = "DataRequest",
3660 [P_RS_DATA_REQUEST
] = "RSDataRequest",
3661 [P_SYNC_PARAM
] = "SyncParam",
3662 [P_SYNC_PARAM89
] = "SyncParam89",
3663 [P_PROTOCOL
] = "ReportProtocol",
3664 [P_UUIDS
] = "ReportUUIDs",
3665 [P_SIZES
] = "ReportSizes",
3666 [P_STATE
] = "ReportState",
3667 [P_SYNC_UUID
] = "ReportSyncUUID",
3668 [P_AUTH_CHALLENGE
] = "AuthChallenge",
3669 [P_AUTH_RESPONSE
] = "AuthResponse",
3671 [P_PING_ACK
] = "PingAck",
3672 [P_RECV_ACK
] = "RecvAck",
3673 [P_WRITE_ACK
] = "WriteAck",
3674 [P_RS_WRITE_ACK
] = "RSWriteAck",
3675 [P_SUPERSEDED
] = "Superseded",
3676 [P_NEG_ACK
] = "NegAck",
3677 [P_NEG_DREPLY
] = "NegDReply",
3678 [P_NEG_RS_DREPLY
] = "NegRSDReply",
3679 [P_BARRIER_ACK
] = "BarrierAck",
3680 [P_STATE_CHG_REQ
] = "StateChgRequest",
3681 [P_STATE_CHG_REPLY
] = "StateChgReply",
3682 [P_OV_REQUEST
] = "OVRequest",
3683 [P_OV_REPLY
] = "OVReply",
3684 [P_OV_RESULT
] = "OVResult",
3685 [P_CSUM_RS_REQUEST
] = "CsumRSRequest",
3686 [P_RS_IS_IN_SYNC
] = "CsumRSIsInSync",
3687 [P_COMPRESSED_BITMAP
] = "CBitmap",
3688 [P_DELAY_PROBE
] = "DelayProbe",
3689 [P_OUT_OF_SYNC
] = "OutOfSync",
3690 [P_RETRY_WRITE
] = "RetryWrite",
3691 [P_RS_CANCEL
] = "RSCancel",
3692 [P_CONN_ST_CHG_REQ
] = "conn_st_chg_req",
3693 [P_CONN_ST_CHG_REPLY
] = "conn_st_chg_reply",
3694 [P_RETRY_WRITE
] = "retry_write",
3695 [P_PROTOCOL_UPDATE
] = "protocol_update",
3697 /* enum drbd_packet, but not commands - obsoleted flags:
3703 /* too big for the array: 0xfffX */
3704 if (cmd
== P_INITIAL_META
)
3705 return "InitialMeta";
3706 if (cmd
== P_INITIAL_DATA
)
3707 return "InitialData";
3708 if (cmd
== P_CONNECTION_FEATURES
)
3709 return "ConnectionFeatures";
3710 if (cmd
>= ARRAY_SIZE(cmdnames
))
3712 return cmdnames
[cmd
];
3716 * drbd_wait_misc - wait for a request to make progress
3717 * @device: device associated with the request
3718 * @i: the struct drbd_interval embedded in struct drbd_request or
3719 * struct drbd_peer_request
3721 int drbd_wait_misc(struct drbd_device
*device
, struct drbd_interval
*i
)
3723 struct net_conf
*nc
;
3728 nc
= rcu_dereference(first_peer_device(device
)->connection
->net_conf
);
3733 timeout
= nc
->ko_count
? nc
->timeout
* HZ
/ 10 * nc
->ko_count
: MAX_SCHEDULE_TIMEOUT
;
3736 /* Indicate to wake up device->misc_wait on progress. */
3738 prepare_to_wait(&device
->misc_wait
, &wait
, TASK_INTERRUPTIBLE
);
3739 spin_unlock_irq(&device
->resource
->req_lock
);
3740 timeout
= schedule_timeout(timeout
);
3741 finish_wait(&device
->misc_wait
, &wait
);
3742 spin_lock_irq(&device
->resource
->req_lock
);
3743 if (!timeout
|| device
->state
.conn
< C_CONNECTED
)
3745 if (signal_pending(current
))
3746 return -ERESTARTSYS
;
3750 void lock_all_resources(void)
3752 struct drbd_resource
*resource
;
3753 int __maybe_unused i
= 0;
3755 mutex_lock(&resources_mutex
);
3756 local_irq_disable();
3757 for_each_resource(resource
, &drbd_resources
)
3758 spin_lock_nested(&resource
->req_lock
, i
++);
3761 void unlock_all_resources(void)
3763 struct drbd_resource
*resource
;
3765 for_each_resource(resource
, &drbd_resources
)
3766 spin_unlock(&resource
->req_lock
);
3768 mutex_unlock(&resources_mutex
);
3771 #ifdef CONFIG_DRBD_FAULT_INJECTION
3772 /* Fault insertion support including random number generator shamelessly
3773 * stolen from kernel/rcutorture.c */
3774 struct fault_random_state
{
3775 unsigned long state
;
3776 unsigned long count
;
3779 #define FAULT_RANDOM_MULT 39916801 /* prime */
3780 #define FAULT_RANDOM_ADD 479001701 /* prime */
3781 #define FAULT_RANDOM_REFRESH 10000
3784 * Crude but fast random-number generator. Uses a linear congruential
3785 * generator, with occasional help from get_random_bytes().
3787 static unsigned long
3788 _drbd_fault_random(struct fault_random_state
*rsp
)
3792 if (!rsp
->count
--) {
3793 get_random_bytes(&refresh
, sizeof(refresh
));
3794 rsp
->state
+= refresh
;
3795 rsp
->count
= FAULT_RANDOM_REFRESH
;
3797 rsp
->state
= rsp
->state
* FAULT_RANDOM_MULT
+ FAULT_RANDOM_ADD
;
3798 return swahw32(rsp
->state
);
3802 _drbd_fault_str(unsigned int type
) {
3803 static char *_faults
[] = {
3804 [DRBD_FAULT_MD_WR
] = "Meta-data write",
3805 [DRBD_FAULT_MD_RD
] = "Meta-data read",
3806 [DRBD_FAULT_RS_WR
] = "Resync write",
3807 [DRBD_FAULT_RS_RD
] = "Resync read",
3808 [DRBD_FAULT_DT_WR
] = "Data write",
3809 [DRBD_FAULT_DT_RD
] = "Data read",
3810 [DRBD_FAULT_DT_RA
] = "Data read ahead",
3811 [DRBD_FAULT_BM_ALLOC
] = "BM allocation",
3812 [DRBD_FAULT_AL_EE
] = "EE allocation",
3813 [DRBD_FAULT_RECEIVE
] = "receive data corruption",
3816 return (type
< DRBD_FAULT_MAX
) ? _faults
[type
] : "**Unknown**";
3820 _drbd_insert_fault(struct drbd_device
*device
, unsigned int type
)
3822 static struct fault_random_state rrs
= {0, 0};
3824 unsigned int ret
= (
3826 ((1 << device_to_minor(device
)) & fault_devs
) != 0) &&
3827 (((_drbd_fault_random(&rrs
) % 100) + 1) <= fault_rate
));
3832 if (__ratelimit(&drbd_ratelimit_state
))
3833 drbd_warn(device
, "***Simulating %s failure\n",
3834 _drbd_fault_str(type
));
3841 const char *drbd_buildtag(void)
3843 /* DRBD built from external sources has here a reference to the
3844 git hash of the source code. */
3846 static char buildtag
[38] = "\0uilt-in";
3848 if (buildtag
[0] == 0) {
3850 sprintf(buildtag
, "srcversion: %-24s", THIS_MODULE
->srcversion
);
3859 module_init(drbd_init
)
3860 module_exit(drbd_cleanup
)
3862 EXPORT_SYMBOL(drbd_conn_str
);
3863 EXPORT_SYMBOL(drbd_role_str
);
3864 EXPORT_SYMBOL(drbd_disk_str
);
3865 EXPORT_SYMBOL(drbd_set_st_err_str
);