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 <linux/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>
55 #include <linux/sched/signal.h>
57 #include <linux/drbd_limits.h>
59 #include "drbd_protocol.h"
60 #include "drbd_req.h" /* only for _req_mod in tl_release and tl_clear */
62 #include "drbd_debugfs.h"
64 static DEFINE_MUTEX(drbd_main_mutex);
65 static int drbd_open(struct block_device *bdev, fmode_t mode);
66 static void drbd_release(struct gendisk *gd, fmode_t mode);
67 static void md_sync_timer_fn(unsigned long data);
68 static int w_bitmap_io(struct drbd_work *w, int unused);
70 MODULE_AUTHOR("Philipp Reisner <phil@linbit.com>, "
71 "Lars Ellenberg <lars@linbit.com>");
72 MODULE_DESCRIPTION("drbd - Distributed Replicated Block Device v" REL_VERSION);
73 MODULE_VERSION(REL_VERSION);
74 MODULE_LICENSE("GPL");
75 MODULE_PARM_DESC(minor_count, "Approximate number of drbd devices ("
76 __stringify(DRBD_MINOR_COUNT_MIN) "-" __stringify(DRBD_MINOR_COUNT_MAX) ")");
77 MODULE_ALIAS_BLOCKDEV_MAJOR(DRBD_MAJOR);
79 #include <linux/moduleparam.h>
80 /* allow_open_on_secondary */
81 MODULE_PARM_DESC(allow_oos, "DONT USE!");
82 /* thanks to these macros, if compiled into the kernel (not-module),
83 * this becomes the boot parameter drbd.minor_count */
84 module_param(minor_count, uint, 0444);
85 module_param(disable_sendpage, bool, 0644);
86 module_param(allow_oos, bool, 0);
87 module_param(proc_details, int, 0644);
89 #ifdef CONFIG_DRBD_FAULT_INJECTION
92 static int fault_count;
94 /* bitmap of enabled faults */
95 module_param(enable_faults, int, 0664);
96 /* fault rate % value - applies to all enabled faults */
97 module_param(fault_rate, int, 0664);
98 /* count of faults inserted */
99 module_param(fault_count, int, 0664);
100 /* bitmap of devices to insert faults on */
101 module_param(fault_devs, int, 0644);
104 /* module parameter, defined */
105 unsigned int minor_count = DRBD_MINOR_COUNT_DEF;
106 bool disable_sendpage;
108 int proc_details; /* Detail level in proc drbd*/
110 /* Module parameter for setting the user mode helper program
111 * to run. Default is /sbin/drbdadm */
112 char usermode_helper[80] = "/sbin/drbdadm";
114 module_param_string(usermode_helper, usermode_helper, sizeof(usermode_helper), 0644);
116 /* in 2.6.x, our device mapping and config info contains our virtual gendisks
117 * as member "struct gendisk *vdisk;"
119 struct idr drbd_devices;
120 struct list_head drbd_resources;
121 struct mutex resources_mutex;
123 struct kmem_cache *drbd_request_cache;
124 struct kmem_cache *drbd_ee_cache; /* peer requests */
125 struct kmem_cache *drbd_bm_ext_cache; /* bitmap extents */
126 struct kmem_cache *drbd_al_ext_cache; /* activity log extents */
127 mempool_t *drbd_request_mempool;
128 mempool_t *drbd_ee_mempool;
129 mempool_t *drbd_md_io_page_pool;
130 struct bio_set *drbd_md_io_bio_set;
131 struct bio_set *drbd_io_bio_set;
133 /* I do not use a standard mempool, because:
134 1) I want to hand out the pre-allocated objects first.
135 2) I want to be able to interrupt sleeping allocation with a signal.
136 Note: This is a single linked list, the next pointer is the private
137 member of struct page.
139 struct page *drbd_pp_pool;
140 spinlock_t drbd_pp_lock;
142 wait_queue_head_t drbd_pp_wait;
144 DEFINE_RATELIMIT_STATE(drbd_ratelimit_state, 5 * HZ, 5);
146 static const struct block_device_operations drbd_ops = {
147 .owner = THIS_MODULE,
149 .release = drbd_release,
152 struct bio *bio_alloc_drbd(gfp_t gfp_mask)
156 if (!drbd_md_io_bio_set)
157 return bio_alloc(gfp_mask, 1);
159 bio = bio_alloc_bioset(gfp_mask, 1, drbd_md_io_bio_set);
166 /* When checking with sparse, and this is an inline function, sparse will
167 give tons of false positives. When this is a real functions sparse works.
169 int _get_ldev_if_state(struct drbd_device *device, enum drbd_disk_state mins)
173 atomic_inc(&device->local_cnt);
174 io_allowed = (device->state.disk >= mins);
176 if (atomic_dec_and_test(&device->local_cnt))
177 wake_up(&device->misc_wait);
185 * tl_release() - mark as BARRIER_ACKED all requests in the corresponding transfer log epoch
186 * @connection: DRBD connection.
187 * @barrier_nr: Expected identifier of the DRBD write barrier packet.
188 * @set_size: Expected number of requests before that barrier.
190 * In case the passed barrier_nr or set_size does not match the oldest
191 * epoch of not yet barrier-acked requests, this function will cause a
192 * termination of the connection.
194 void tl_release(struct drbd_connection *connection, unsigned int barrier_nr,
195 unsigned int set_size)
197 struct drbd_request *r;
198 struct drbd_request *req = NULL;
199 int expect_epoch = 0;
202 spin_lock_irq(&connection->resource->req_lock);
204 /* find oldest not yet barrier-acked write request,
205 * count writes in its epoch. */
206 list_for_each_entry(r, &connection->transfer_log, tl_requests) {
207 const unsigned s = r->rq_state;
211 if (!(s & RQ_NET_MASK))
216 expect_epoch = req->epoch;
219 if (r->epoch != expect_epoch)
223 /* if (s & RQ_DONE): not expected */
224 /* if (!(s & RQ_NET_MASK)): not expected */
229 /* first some paranoia code */
231 drbd_err(connection, "BAD! BarrierAck #%u received, but no epoch in tl!?\n",
235 if (expect_epoch != barrier_nr) {
236 drbd_err(connection, "BAD! BarrierAck #%u received, expected #%u!\n",
237 barrier_nr, expect_epoch);
241 if (expect_size != set_size) {
242 drbd_err(connection, "BAD! BarrierAck #%u received with n_writes=%u, expected n_writes=%u!\n",
243 barrier_nr, set_size, expect_size);
247 /* Clean up list of requests processed during current epoch. */
248 /* this extra list walk restart is paranoia,
249 * to catch requests being barrier-acked "unexpectedly".
250 * It usually should find the same req again, or some READ preceding it. */
251 list_for_each_entry(req, &connection->transfer_log, tl_requests)
252 if (req->epoch == expect_epoch)
254 list_for_each_entry_safe_from(req, r, &connection->transfer_log, tl_requests) {
255 if (req->epoch != expect_epoch)
257 _req_mod(req, BARRIER_ACKED);
259 spin_unlock_irq(&connection->resource->req_lock);
264 spin_unlock_irq(&connection->resource->req_lock);
265 conn_request_state(connection, NS(conn, C_PROTOCOL_ERROR), CS_HARD);
270 * _tl_restart() - Walks the transfer log, and applies an action to all requests
271 * @connection: DRBD connection to operate on.
272 * @what: The action/event to perform with all request objects
274 * @what might be one of CONNECTION_LOST_WHILE_PENDING, RESEND, FAIL_FROZEN_DISK_IO,
275 * RESTART_FROZEN_DISK_IO.
277 /* must hold resource->req_lock */
278 void _tl_restart(struct drbd_connection *connection, enum drbd_req_event what)
280 struct drbd_request *req, *r;
282 list_for_each_entry_safe(req, r, &connection->transfer_log, tl_requests)
286 void tl_restart(struct drbd_connection *connection, enum drbd_req_event what)
288 spin_lock_irq(&connection->resource->req_lock);
289 _tl_restart(connection, what);
290 spin_unlock_irq(&connection->resource->req_lock);
294 * tl_clear() - Clears all requests and &struct drbd_tl_epoch objects out of the TL
295 * @device: DRBD device.
297 * This is called after the connection to the peer was lost. The storage covered
298 * by the requests on the transfer gets marked as our of sync. Called from the
299 * receiver thread and the worker thread.
301 void tl_clear(struct drbd_connection *connection)
303 tl_restart(connection, CONNECTION_LOST_WHILE_PENDING);
307 * tl_abort_disk_io() - Abort disk I/O for all requests for a certain device in the TL
308 * @device: DRBD device.
310 void tl_abort_disk_io(struct drbd_device *device)
312 struct drbd_connection *connection = first_peer_device(device)->connection;
313 struct drbd_request *req, *r;
315 spin_lock_irq(&connection->resource->req_lock);
316 list_for_each_entry_safe(req, r, &connection->transfer_log, tl_requests) {
317 if (!(req->rq_state & RQ_LOCAL_PENDING))
319 if (req->device != device)
321 _req_mod(req, ABORT_DISK_IO);
323 spin_unlock_irq(&connection->resource->req_lock);
326 static int drbd_thread_setup(void *arg)
328 struct drbd_thread *thi = (struct drbd_thread *) arg;
329 struct drbd_resource *resource = thi->resource;
333 snprintf(current->comm, sizeof(current->comm), "drbd_%c_%s",
338 retval = thi->function(thi);
340 spin_lock_irqsave(&thi->t_lock, flags);
342 /* if the receiver has been "EXITING", the last thing it did
343 * was set the conn state to "StandAlone",
344 * if now a re-connect request comes in, conn state goes C_UNCONNECTED,
345 * and receiver thread will be "started".
346 * drbd_thread_start needs to set "RESTARTING" in that case.
347 * t_state check and assignment needs to be within the same spinlock,
348 * so either thread_start sees EXITING, and can remap to RESTARTING,
349 * or thread_start see NONE, and can proceed as normal.
352 if (thi->t_state == RESTARTING) {
353 drbd_info(resource, "Restarting %s thread\n", thi->name);
354 thi->t_state = RUNNING;
355 spin_unlock_irqrestore(&thi->t_lock, flags);
362 complete_all(&thi->stop);
363 spin_unlock_irqrestore(&thi->t_lock, flags);
365 drbd_info(resource, "Terminating %s\n", current->comm);
367 /* Release mod reference taken when thread was started */
370 kref_put(&thi->connection->kref, drbd_destroy_connection);
371 kref_put(&resource->kref, drbd_destroy_resource);
372 module_put(THIS_MODULE);
376 static void drbd_thread_init(struct drbd_resource *resource, struct drbd_thread *thi,
377 int (*func) (struct drbd_thread *), const char *name)
379 spin_lock_init(&thi->t_lock);
382 thi->function = func;
383 thi->resource = resource;
384 thi->connection = NULL;
388 int drbd_thread_start(struct drbd_thread *thi)
390 struct drbd_resource *resource = thi->resource;
391 struct task_struct *nt;
394 /* is used from state engine doing drbd_thread_stop_nowait,
395 * while holding the req lock irqsave */
396 spin_lock_irqsave(&thi->t_lock, flags);
398 switch (thi->t_state) {
400 drbd_info(resource, "Starting %s thread (from %s [%d])\n",
401 thi->name, current->comm, current->pid);
403 /* Get ref on module for thread - this is released when thread exits */
404 if (!try_module_get(THIS_MODULE)) {
405 drbd_err(resource, "Failed to get module reference in drbd_thread_start\n");
406 spin_unlock_irqrestore(&thi->t_lock, flags);
410 kref_get(&resource->kref);
412 kref_get(&thi->connection->kref);
414 init_completion(&thi->stop);
415 thi->reset_cpu_mask = 1;
416 thi->t_state = RUNNING;
417 spin_unlock_irqrestore(&thi->t_lock, flags);
418 flush_signals(current); /* otherw. may get -ERESTARTNOINTR */
420 nt = kthread_create(drbd_thread_setup, (void *) thi,
421 "drbd_%c_%s", thi->name[0], thi->resource->name);
424 drbd_err(resource, "Couldn't start thread\n");
427 kref_put(&thi->connection->kref, drbd_destroy_connection);
428 kref_put(&resource->kref, drbd_destroy_resource);
429 module_put(THIS_MODULE);
432 spin_lock_irqsave(&thi->t_lock, flags);
434 thi->t_state = RUNNING;
435 spin_unlock_irqrestore(&thi->t_lock, flags);
439 thi->t_state = RESTARTING;
440 drbd_info(resource, "Restarting %s thread (from %s [%d])\n",
441 thi->name, current->comm, current->pid);
446 spin_unlock_irqrestore(&thi->t_lock, flags);
454 void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait)
458 enum drbd_thread_state ns = restart ? RESTARTING : EXITING;
460 /* may be called from state engine, holding the req lock irqsave */
461 spin_lock_irqsave(&thi->t_lock, flags);
463 if (thi->t_state == NONE) {
464 spin_unlock_irqrestore(&thi->t_lock, flags);
466 drbd_thread_start(thi);
470 if (thi->t_state != ns) {
471 if (thi->task == NULL) {
472 spin_unlock_irqrestore(&thi->t_lock, flags);
478 init_completion(&thi->stop);
479 if (thi->task != current)
480 force_sig(DRBD_SIGKILL, thi->task);
483 spin_unlock_irqrestore(&thi->t_lock, flags);
486 wait_for_completion(&thi->stop);
489 int conn_lowest_minor(struct drbd_connection *connection)
491 struct drbd_peer_device *peer_device;
492 int vnr = 0, minor = -1;
495 peer_device = idr_get_next(&connection->peer_devices, &vnr);
497 minor = device_to_minor(peer_device->device);
505 * drbd_calc_cpu_mask() - Generate CPU masks, spread over all CPUs
507 * Forces all threads of a resource onto the same CPU. This is beneficial for
508 * DRBD's performance. May be overwritten by user's configuration.
510 static void drbd_calc_cpu_mask(cpumask_var_t *cpu_mask)
512 unsigned int *resources_per_cpu, min_index = ~0;
514 resources_per_cpu = kzalloc(nr_cpu_ids * sizeof(*resources_per_cpu), GFP_KERNEL);
515 if (resources_per_cpu) {
516 struct drbd_resource *resource;
517 unsigned int cpu, min = ~0;
520 for_each_resource_rcu(resource, &drbd_resources) {
521 for_each_cpu(cpu, resource->cpu_mask)
522 resources_per_cpu[cpu]++;
525 for_each_online_cpu(cpu) {
526 if (resources_per_cpu[cpu] < min) {
527 min = resources_per_cpu[cpu];
531 kfree(resources_per_cpu);
533 if (min_index == ~0) {
534 cpumask_setall(*cpu_mask);
537 cpumask_set_cpu(min_index, *cpu_mask);
541 * drbd_thread_current_set_cpu() - modifies the cpu mask of the _current_ thread
542 * @device: DRBD device.
543 * @thi: drbd_thread object
545 * call in the "main loop" of _all_ threads, no need for any mutex, current won't die
548 void drbd_thread_current_set_cpu(struct drbd_thread *thi)
550 struct drbd_resource *resource = thi->resource;
551 struct task_struct *p = current;
553 if (!thi->reset_cpu_mask)
555 thi->reset_cpu_mask = 0;
556 set_cpus_allowed_ptr(p, resource->cpu_mask);
559 #define drbd_calc_cpu_mask(A) ({})
563 * drbd_header_size - size of a packet header
565 * The header size is a multiple of 8, so any payload following the header is
566 * word aligned on 64-bit architectures. (The bitmap send and receive code
569 unsigned int drbd_header_size(struct drbd_connection *connection)
571 if (connection->agreed_pro_version >= 100) {
572 BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header100), 8));
573 return sizeof(struct p_header100);
575 BUILD_BUG_ON(sizeof(struct p_header80) !=
576 sizeof(struct p_header95));
577 BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header80), 8));
578 return sizeof(struct p_header80);
582 static unsigned int prepare_header80(struct p_header80 *h, enum drbd_packet cmd, int size)
584 h->magic = cpu_to_be32(DRBD_MAGIC);
585 h->command = cpu_to_be16(cmd);
586 h->length = cpu_to_be16(size);
587 return sizeof(struct p_header80);
590 static unsigned int prepare_header95(struct p_header95 *h, enum drbd_packet cmd, int size)
592 h->magic = cpu_to_be16(DRBD_MAGIC_BIG);
593 h->command = cpu_to_be16(cmd);
594 h->length = cpu_to_be32(size);
595 return sizeof(struct p_header95);
598 static unsigned int prepare_header100(struct p_header100 *h, enum drbd_packet cmd,
601 h->magic = cpu_to_be32(DRBD_MAGIC_100);
602 h->volume = cpu_to_be16(vnr);
603 h->command = cpu_to_be16(cmd);
604 h->length = cpu_to_be32(size);
606 return sizeof(struct p_header100);
609 static unsigned int prepare_header(struct drbd_connection *connection, int vnr,
610 void *buffer, enum drbd_packet cmd, int size)
612 if (connection->agreed_pro_version >= 100)
613 return prepare_header100(buffer, cmd, size, vnr);
614 else if (connection->agreed_pro_version >= 95 &&
615 size > DRBD_MAX_SIZE_H80_PACKET)
616 return prepare_header95(buffer, cmd, size);
618 return prepare_header80(buffer, cmd, size);
621 static void *__conn_prepare_command(struct drbd_connection *connection,
622 struct drbd_socket *sock)
626 return sock->sbuf + drbd_header_size(connection);
629 void *conn_prepare_command(struct drbd_connection *connection, struct drbd_socket *sock)
633 mutex_lock(&sock->mutex);
634 p = __conn_prepare_command(connection, sock);
636 mutex_unlock(&sock->mutex);
641 void *drbd_prepare_command(struct drbd_peer_device *peer_device, struct drbd_socket *sock)
643 return conn_prepare_command(peer_device->connection, sock);
646 static int __send_command(struct drbd_connection *connection, int vnr,
647 struct drbd_socket *sock, enum drbd_packet cmd,
648 unsigned int header_size, void *data,
655 * Called with @data == NULL and the size of the data blocks in @size
656 * for commands that send data blocks. For those commands, omit the
657 * MSG_MORE flag: this will increase the likelihood that data blocks
658 * which are page aligned on the sender will end up page aligned on the
661 msg_flags = data ? MSG_MORE : 0;
663 header_size += prepare_header(connection, vnr, sock->sbuf, cmd,
665 err = drbd_send_all(connection, sock->socket, sock->sbuf, header_size,
668 err = drbd_send_all(connection, sock->socket, data, size, 0);
669 /* DRBD protocol "pings" are latency critical.
670 * This is supposed to trigger tcp_push_pending_frames() */
671 if (!err && (cmd == P_PING || cmd == P_PING_ACK))
672 drbd_tcp_nodelay(sock->socket);
677 static int __conn_send_command(struct drbd_connection *connection, struct drbd_socket *sock,
678 enum drbd_packet cmd, unsigned int header_size,
679 void *data, unsigned int size)
681 return __send_command(connection, 0, sock, cmd, header_size, data, size);
684 int conn_send_command(struct drbd_connection *connection, struct drbd_socket *sock,
685 enum drbd_packet cmd, unsigned int header_size,
686 void *data, unsigned int size)
690 err = __conn_send_command(connection, sock, cmd, header_size, data, size);
691 mutex_unlock(&sock->mutex);
695 int drbd_send_command(struct drbd_peer_device *peer_device, struct drbd_socket *sock,
696 enum drbd_packet cmd, unsigned int header_size,
697 void *data, unsigned int size)
701 err = __send_command(peer_device->connection, peer_device->device->vnr,
702 sock, cmd, header_size, data, size);
703 mutex_unlock(&sock->mutex);
707 int drbd_send_ping(struct drbd_connection *connection)
709 struct drbd_socket *sock;
711 sock = &connection->meta;
712 if (!conn_prepare_command(connection, sock))
714 return conn_send_command(connection, sock, P_PING, 0, NULL, 0);
717 int drbd_send_ping_ack(struct drbd_connection *connection)
719 struct drbd_socket *sock;
721 sock = &connection->meta;
722 if (!conn_prepare_command(connection, sock))
724 return conn_send_command(connection, sock, P_PING_ACK, 0, NULL, 0);
727 int drbd_send_sync_param(struct drbd_peer_device *peer_device)
729 struct drbd_socket *sock;
730 struct p_rs_param_95 *p;
732 const int apv = peer_device->connection->agreed_pro_version;
733 enum drbd_packet cmd;
735 struct disk_conf *dc;
737 sock = &peer_device->connection->data;
738 p = drbd_prepare_command(peer_device, sock);
743 nc = rcu_dereference(peer_device->connection->net_conf);
745 size = apv <= 87 ? sizeof(struct p_rs_param)
746 : apv == 88 ? sizeof(struct p_rs_param)
747 + strlen(nc->verify_alg) + 1
748 : apv <= 94 ? sizeof(struct p_rs_param_89)
749 : /* apv >= 95 */ sizeof(struct p_rs_param_95);
751 cmd = apv >= 89 ? P_SYNC_PARAM89 : P_SYNC_PARAM;
753 /* initialize verify_alg and csums_alg */
754 memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX);
756 if (get_ldev(peer_device->device)) {
757 dc = rcu_dereference(peer_device->device->ldev->disk_conf);
758 p->resync_rate = cpu_to_be32(dc->resync_rate);
759 p->c_plan_ahead = cpu_to_be32(dc->c_plan_ahead);
760 p->c_delay_target = cpu_to_be32(dc->c_delay_target);
761 p->c_fill_target = cpu_to_be32(dc->c_fill_target);
762 p->c_max_rate = cpu_to_be32(dc->c_max_rate);
763 put_ldev(peer_device->device);
765 p->resync_rate = cpu_to_be32(DRBD_RESYNC_RATE_DEF);
766 p->c_plan_ahead = cpu_to_be32(DRBD_C_PLAN_AHEAD_DEF);
767 p->c_delay_target = cpu_to_be32(DRBD_C_DELAY_TARGET_DEF);
768 p->c_fill_target = cpu_to_be32(DRBD_C_FILL_TARGET_DEF);
769 p->c_max_rate = cpu_to_be32(DRBD_C_MAX_RATE_DEF);
773 strcpy(p->verify_alg, nc->verify_alg);
775 strcpy(p->csums_alg, nc->csums_alg);
778 return drbd_send_command(peer_device, sock, cmd, size, NULL, 0);
781 int __drbd_send_protocol(struct drbd_connection *connection, enum drbd_packet cmd)
783 struct drbd_socket *sock;
784 struct p_protocol *p;
788 sock = &connection->data;
789 p = __conn_prepare_command(connection, sock);
794 nc = rcu_dereference(connection->net_conf);
796 if (nc->tentative && connection->agreed_pro_version < 92) {
798 mutex_unlock(&sock->mutex);
799 drbd_err(connection, "--dry-run is not supported by peer");
804 if (connection->agreed_pro_version >= 87)
805 size += strlen(nc->integrity_alg) + 1;
807 p->protocol = cpu_to_be32(nc->wire_protocol);
808 p->after_sb_0p = cpu_to_be32(nc->after_sb_0p);
809 p->after_sb_1p = cpu_to_be32(nc->after_sb_1p);
810 p->after_sb_2p = cpu_to_be32(nc->after_sb_2p);
811 p->two_primaries = cpu_to_be32(nc->two_primaries);
813 if (nc->discard_my_data)
814 cf |= CF_DISCARD_MY_DATA;
817 p->conn_flags = cpu_to_be32(cf);
819 if (connection->agreed_pro_version >= 87)
820 strcpy(p->integrity_alg, nc->integrity_alg);
823 return __conn_send_command(connection, sock, cmd, size, NULL, 0);
826 int drbd_send_protocol(struct drbd_connection *connection)
830 mutex_lock(&connection->data.mutex);
831 err = __drbd_send_protocol(connection, P_PROTOCOL);
832 mutex_unlock(&connection->data.mutex);
837 static int _drbd_send_uuids(struct drbd_peer_device *peer_device, u64 uuid_flags)
839 struct drbd_device *device = peer_device->device;
840 struct drbd_socket *sock;
844 if (!get_ldev_if_state(device, D_NEGOTIATING))
847 sock = &peer_device->connection->data;
848 p = drbd_prepare_command(peer_device, sock);
853 spin_lock_irq(&device->ldev->md.uuid_lock);
854 for (i = UI_CURRENT; i < UI_SIZE; i++)
855 p->uuid[i] = cpu_to_be64(device->ldev->md.uuid[i]);
856 spin_unlock_irq(&device->ldev->md.uuid_lock);
858 device->comm_bm_set = drbd_bm_total_weight(device);
859 p->uuid[UI_SIZE] = cpu_to_be64(device->comm_bm_set);
861 uuid_flags |= rcu_dereference(peer_device->connection->net_conf)->discard_my_data ? 1 : 0;
863 uuid_flags |= test_bit(CRASHED_PRIMARY, &device->flags) ? 2 : 0;
864 uuid_flags |= device->new_state_tmp.disk == D_INCONSISTENT ? 4 : 0;
865 p->uuid[UI_FLAGS] = cpu_to_be64(uuid_flags);
868 return drbd_send_command(peer_device, sock, P_UUIDS, sizeof(*p), NULL, 0);
871 int drbd_send_uuids(struct drbd_peer_device *peer_device)
873 return _drbd_send_uuids(peer_device, 0);
876 int drbd_send_uuids_skip_initial_sync(struct drbd_peer_device *peer_device)
878 return _drbd_send_uuids(peer_device, 8);
881 void drbd_print_uuids(struct drbd_device *device, const char *text)
883 if (get_ldev_if_state(device, D_NEGOTIATING)) {
884 u64 *uuid = device->ldev->md.uuid;
885 drbd_info(device, "%s %016llX:%016llX:%016llX:%016llX\n",
887 (unsigned long long)uuid[UI_CURRENT],
888 (unsigned long long)uuid[UI_BITMAP],
889 (unsigned long long)uuid[UI_HISTORY_START],
890 (unsigned long long)uuid[UI_HISTORY_END]);
893 drbd_info(device, "%s effective data uuid: %016llX\n",
895 (unsigned long long)device->ed_uuid);
899 void drbd_gen_and_send_sync_uuid(struct drbd_peer_device *peer_device)
901 struct drbd_device *device = peer_device->device;
902 struct drbd_socket *sock;
906 D_ASSERT(device, device->state.disk == D_UP_TO_DATE);
908 uuid = device->ldev->md.uuid[UI_BITMAP];
909 if (uuid && uuid != UUID_JUST_CREATED)
910 uuid = uuid + UUID_NEW_BM_OFFSET;
912 get_random_bytes(&uuid, sizeof(u64));
913 drbd_uuid_set(device, UI_BITMAP, uuid);
914 drbd_print_uuids(device, "updated sync UUID");
915 drbd_md_sync(device);
917 sock = &peer_device->connection->data;
918 p = drbd_prepare_command(peer_device, sock);
920 p->uuid = cpu_to_be64(uuid);
921 drbd_send_command(peer_device, sock, P_SYNC_UUID, sizeof(*p), NULL, 0);
925 /* communicated if (agreed_features & DRBD_FF_WSAME) */
926 void assign_p_sizes_qlim(struct drbd_device *device, struct p_sizes *p, struct request_queue *q)
929 p->qlim->physical_block_size = cpu_to_be32(queue_physical_block_size(q));
930 p->qlim->logical_block_size = cpu_to_be32(queue_logical_block_size(q));
931 p->qlim->alignment_offset = cpu_to_be32(queue_alignment_offset(q));
932 p->qlim->io_min = cpu_to_be32(queue_io_min(q));
933 p->qlim->io_opt = cpu_to_be32(queue_io_opt(q));
934 p->qlim->discard_enabled = blk_queue_discard(q);
935 p->qlim->write_same_capable = !!q->limits.max_write_same_sectors;
937 q = device->rq_queue;
938 p->qlim->physical_block_size = cpu_to_be32(queue_physical_block_size(q));
939 p->qlim->logical_block_size = cpu_to_be32(queue_logical_block_size(q));
940 p->qlim->alignment_offset = 0;
941 p->qlim->io_min = cpu_to_be32(queue_io_min(q));
942 p->qlim->io_opt = cpu_to_be32(queue_io_opt(q));
943 p->qlim->discard_enabled = 0;
944 p->qlim->write_same_capable = 0;
948 int drbd_send_sizes(struct drbd_peer_device *peer_device, int trigger_reply, enum dds_flags flags)
950 struct drbd_device *device = peer_device->device;
951 struct drbd_socket *sock;
953 sector_t d_size, u_size;
955 unsigned int max_bio_size;
956 unsigned int packet_size;
958 sock = &peer_device->connection->data;
959 p = drbd_prepare_command(peer_device, sock);
963 packet_size = sizeof(*p);
964 if (peer_device->connection->agreed_features & DRBD_FF_WSAME)
965 packet_size += sizeof(p->qlim[0]);
967 memset(p, 0, packet_size);
968 if (get_ldev_if_state(device, D_NEGOTIATING)) {
969 struct request_queue *q = bdev_get_queue(device->ldev->backing_bdev);
970 d_size = drbd_get_max_capacity(device->ldev);
972 u_size = rcu_dereference(device->ldev->disk_conf)->disk_size;
974 q_order_type = drbd_queue_order_type(device);
975 max_bio_size = queue_max_hw_sectors(q) << 9;
976 max_bio_size = min(max_bio_size, DRBD_MAX_BIO_SIZE);
977 assign_p_sizes_qlim(device, p, q);
982 q_order_type = QUEUE_ORDERED_NONE;
983 max_bio_size = DRBD_MAX_BIO_SIZE; /* ... multiple BIOs per peer_request */
984 assign_p_sizes_qlim(device, p, NULL);
987 if (peer_device->connection->agreed_pro_version <= 94)
988 max_bio_size = min(max_bio_size, DRBD_MAX_SIZE_H80_PACKET);
989 else if (peer_device->connection->agreed_pro_version < 100)
990 max_bio_size = min(max_bio_size, DRBD_MAX_BIO_SIZE_P95);
992 p->d_size = cpu_to_be64(d_size);
993 p->u_size = cpu_to_be64(u_size);
994 p->c_size = cpu_to_be64(trigger_reply ? 0 : drbd_get_capacity(device->this_bdev));
995 p->max_bio_size = cpu_to_be32(max_bio_size);
996 p->queue_order_type = cpu_to_be16(q_order_type);
997 p->dds_flags = cpu_to_be16(flags);
999 return drbd_send_command(peer_device, sock, P_SIZES, packet_size, NULL, 0);
1003 * drbd_send_current_state() - Sends the drbd state to the peer
1004 * @peer_device: DRBD peer device.
1006 int drbd_send_current_state(struct drbd_peer_device *peer_device)
1008 struct drbd_socket *sock;
1011 sock = &peer_device->connection->data;
1012 p = drbd_prepare_command(peer_device, sock);
1015 p->state = cpu_to_be32(peer_device->device->state.i); /* Within the send mutex */
1016 return drbd_send_command(peer_device, sock, P_STATE, sizeof(*p), NULL, 0);
1020 * drbd_send_state() - After a state change, sends the new state to the peer
1021 * @peer_device: DRBD peer device.
1022 * @state: the state to send, not necessarily the current state.
1024 * Each state change queues an "after_state_ch" work, which will eventually
1025 * send the resulting new state to the peer. If more state changes happen
1026 * between queuing and processing of the after_state_ch work, we still
1027 * want to send each intermediary state in the order it occurred.
1029 int drbd_send_state(struct drbd_peer_device *peer_device, union drbd_state state)
1031 struct drbd_socket *sock;
1034 sock = &peer_device->connection->data;
1035 p = drbd_prepare_command(peer_device, sock);
1038 p->state = cpu_to_be32(state.i); /* Within the send mutex */
1039 return drbd_send_command(peer_device, sock, P_STATE, sizeof(*p), NULL, 0);
1042 int drbd_send_state_req(struct drbd_peer_device *peer_device, union drbd_state mask, union drbd_state val)
1044 struct drbd_socket *sock;
1045 struct p_req_state *p;
1047 sock = &peer_device->connection->data;
1048 p = drbd_prepare_command(peer_device, sock);
1051 p->mask = cpu_to_be32(mask.i);
1052 p->val = cpu_to_be32(val.i);
1053 return drbd_send_command(peer_device, sock, P_STATE_CHG_REQ, sizeof(*p), NULL, 0);
1056 int conn_send_state_req(struct drbd_connection *connection, union drbd_state mask, union drbd_state val)
1058 enum drbd_packet cmd;
1059 struct drbd_socket *sock;
1060 struct p_req_state *p;
1062 cmd = connection->agreed_pro_version < 100 ? P_STATE_CHG_REQ : P_CONN_ST_CHG_REQ;
1063 sock = &connection->data;
1064 p = conn_prepare_command(connection, sock);
1067 p->mask = cpu_to_be32(mask.i);
1068 p->val = cpu_to_be32(val.i);
1069 return conn_send_command(connection, sock, cmd, sizeof(*p), NULL, 0);
1072 void drbd_send_sr_reply(struct drbd_peer_device *peer_device, enum drbd_state_rv retcode)
1074 struct drbd_socket *sock;
1075 struct p_req_state_reply *p;
1077 sock = &peer_device->connection->meta;
1078 p = drbd_prepare_command(peer_device, sock);
1080 p->retcode = cpu_to_be32(retcode);
1081 drbd_send_command(peer_device, sock, P_STATE_CHG_REPLY, sizeof(*p), NULL, 0);
1085 void conn_send_sr_reply(struct drbd_connection *connection, enum drbd_state_rv retcode)
1087 struct drbd_socket *sock;
1088 struct p_req_state_reply *p;
1089 enum drbd_packet cmd = connection->agreed_pro_version < 100 ? P_STATE_CHG_REPLY : P_CONN_ST_CHG_REPLY;
1091 sock = &connection->meta;
1092 p = conn_prepare_command(connection, sock);
1094 p->retcode = cpu_to_be32(retcode);
1095 conn_send_command(connection, sock, cmd, sizeof(*p), NULL, 0);
1099 static void dcbp_set_code(struct p_compressed_bm *p, enum drbd_bitmap_code code)
1101 BUG_ON(code & ~0xf);
1102 p->encoding = (p->encoding & ~0xf) | code;
1105 static void dcbp_set_start(struct p_compressed_bm *p, int set)
1107 p->encoding = (p->encoding & ~0x80) | (set ? 0x80 : 0);
1110 static void dcbp_set_pad_bits(struct p_compressed_bm *p, int n)
1113 p->encoding = (p->encoding & (~0x7 << 4)) | (n << 4);
1116 static int fill_bitmap_rle_bits(struct drbd_device *device,
1117 struct p_compressed_bm *p,
1119 struct bm_xfer_ctx *c)
1121 struct bitstream bs;
1122 unsigned long plain_bits;
1129 /* may we use this feature? */
1131 use_rle = rcu_dereference(first_peer_device(device)->connection->net_conf)->use_rle;
1133 if (!use_rle || first_peer_device(device)->connection->agreed_pro_version < 90)
1136 if (c->bit_offset >= c->bm_bits)
1137 return 0; /* nothing to do. */
1139 /* use at most thus many bytes */
1140 bitstream_init(&bs, p->code, size, 0);
1141 memset(p->code, 0, size);
1142 /* plain bits covered in this code string */
1145 /* p->encoding & 0x80 stores whether the first run length is set.
1146 * bit offset is implicit.
1147 * start with toggle == 2 to be able to tell the first iteration */
1150 /* see how much plain bits we can stuff into one packet
1151 * using RLE and VLI. */
1153 tmp = (toggle == 0) ? _drbd_bm_find_next_zero(device, c->bit_offset)
1154 : _drbd_bm_find_next(device, c->bit_offset);
1157 rl = tmp - c->bit_offset;
1159 if (toggle == 2) { /* first iteration */
1161 /* the first checked bit was set,
1162 * store start value, */
1163 dcbp_set_start(p, 1);
1164 /* but skip encoding of zero run length */
1168 dcbp_set_start(p, 0);
1171 /* paranoia: catch zero runlength.
1172 * can only happen if bitmap is modified while we scan it. */
1174 drbd_err(device, "unexpected zero runlength while encoding bitmap "
1175 "t:%u bo:%lu\n", toggle, c->bit_offset);
1179 bits = vli_encode_bits(&bs, rl);
1180 if (bits == -ENOBUFS) /* buffer full */
1183 drbd_err(device, "error while encoding bitmap: %d\n", bits);
1189 c->bit_offset = tmp;
1190 } while (c->bit_offset < c->bm_bits);
1192 len = bs.cur.b - p->code + !!bs.cur.bit;
1194 if (plain_bits < (len << 3)) {
1195 /* incompressible with this method.
1196 * we need to rewind both word and bit position. */
1197 c->bit_offset -= plain_bits;
1198 bm_xfer_ctx_bit_to_word_offset(c);
1199 c->bit_offset = c->word_offset * BITS_PER_LONG;
1203 /* RLE + VLI was able to compress it just fine.
1204 * update c->word_offset. */
1205 bm_xfer_ctx_bit_to_word_offset(c);
1207 /* store pad_bits */
1208 dcbp_set_pad_bits(p, (8 - bs.cur.bit) & 0x7);
1214 * send_bitmap_rle_or_plain
1216 * Return 0 when done, 1 when another iteration is needed, and a negative error
1217 * code upon failure.
1220 send_bitmap_rle_or_plain(struct drbd_device *device, struct bm_xfer_ctx *c)
1222 struct drbd_socket *sock = &first_peer_device(device)->connection->data;
1223 unsigned int header_size = drbd_header_size(first_peer_device(device)->connection);
1224 struct p_compressed_bm *p = sock->sbuf + header_size;
1227 len = fill_bitmap_rle_bits(device, p,
1228 DRBD_SOCKET_BUFFER_SIZE - header_size - sizeof(*p), c);
1233 dcbp_set_code(p, RLE_VLI_Bits);
1234 err = __send_command(first_peer_device(device)->connection, device->vnr, sock,
1235 P_COMPRESSED_BITMAP, sizeof(*p) + len,
1238 c->bytes[0] += header_size + sizeof(*p) + len;
1240 if (c->bit_offset >= c->bm_bits)
1243 /* was not compressible.
1244 * send a buffer full of plain text bits instead. */
1245 unsigned int data_size;
1246 unsigned long num_words;
1247 unsigned long *p = sock->sbuf + header_size;
1249 data_size = DRBD_SOCKET_BUFFER_SIZE - header_size;
1250 num_words = min_t(size_t, data_size / sizeof(*p),
1251 c->bm_words - c->word_offset);
1252 len = num_words * sizeof(*p);
1254 drbd_bm_get_lel(device, c->word_offset, num_words, p);
1255 err = __send_command(first_peer_device(device)->connection, device->vnr, sock, P_BITMAP, len, NULL, 0);
1256 c->word_offset += num_words;
1257 c->bit_offset = c->word_offset * BITS_PER_LONG;
1260 c->bytes[1] += header_size + len;
1262 if (c->bit_offset > c->bm_bits)
1263 c->bit_offset = c->bm_bits;
1267 INFO_bm_xfer_stats(device, "send", c);
1275 /* See the comment at receive_bitmap() */
1276 static int _drbd_send_bitmap(struct drbd_device *device)
1278 struct bm_xfer_ctx c;
1281 if (!expect(device->bitmap))
1284 if (get_ldev(device)) {
1285 if (drbd_md_test_flag(device->ldev, MDF_FULL_SYNC)) {
1286 drbd_info(device, "Writing the whole bitmap, MDF_FullSync was set.\n");
1287 drbd_bm_set_all(device);
1288 if (drbd_bm_write(device)) {
1289 /* write_bm did fail! Leave full sync flag set in Meta P_DATA
1290 * but otherwise process as per normal - need to tell other
1291 * side that a full resync is required! */
1292 drbd_err(device, "Failed to write bitmap to disk!\n");
1294 drbd_md_clear_flag(device, MDF_FULL_SYNC);
1295 drbd_md_sync(device);
1301 c = (struct bm_xfer_ctx) {
1302 .bm_bits = drbd_bm_bits(device),
1303 .bm_words = drbd_bm_words(device),
1307 err = send_bitmap_rle_or_plain(device, &c);
1313 int drbd_send_bitmap(struct drbd_device *device)
1315 struct drbd_socket *sock = &first_peer_device(device)->connection->data;
1318 mutex_lock(&sock->mutex);
1320 err = !_drbd_send_bitmap(device);
1321 mutex_unlock(&sock->mutex);
1325 void drbd_send_b_ack(struct drbd_connection *connection, u32 barrier_nr, u32 set_size)
1327 struct drbd_socket *sock;
1328 struct p_barrier_ack *p;
1330 if (connection->cstate < C_WF_REPORT_PARAMS)
1333 sock = &connection->meta;
1334 p = conn_prepare_command(connection, sock);
1337 p->barrier = barrier_nr;
1338 p->set_size = cpu_to_be32(set_size);
1339 conn_send_command(connection, sock, P_BARRIER_ACK, sizeof(*p), NULL, 0);
1343 * _drbd_send_ack() - Sends an ack packet
1344 * @device: DRBD device.
1345 * @cmd: Packet command code.
1346 * @sector: sector, needs to be in big endian byte order
1347 * @blksize: size in byte, needs to be in big endian byte order
1348 * @block_id: Id, big endian byte order
1350 static int _drbd_send_ack(struct drbd_peer_device *peer_device, enum drbd_packet cmd,
1351 u64 sector, u32 blksize, u64 block_id)
1353 struct drbd_socket *sock;
1354 struct p_block_ack *p;
1356 if (peer_device->device->state.conn < C_CONNECTED)
1359 sock = &peer_device->connection->meta;
1360 p = drbd_prepare_command(peer_device, sock);
1364 p->block_id = block_id;
1365 p->blksize = blksize;
1366 p->seq_num = cpu_to_be32(atomic_inc_return(&peer_device->device->packet_seq));
1367 return drbd_send_command(peer_device, sock, cmd, sizeof(*p), NULL, 0);
1370 /* dp->sector and dp->block_id already/still in network byte order,
1371 * data_size is payload size according to dp->head,
1372 * and may need to be corrected for digest size. */
1373 void drbd_send_ack_dp(struct drbd_peer_device *peer_device, enum drbd_packet cmd,
1374 struct p_data *dp, int data_size)
1376 if (peer_device->connection->peer_integrity_tfm)
1377 data_size -= crypto_ahash_digestsize(peer_device->connection->peer_integrity_tfm);
1378 _drbd_send_ack(peer_device, cmd, dp->sector, cpu_to_be32(data_size),
1382 void drbd_send_ack_rp(struct drbd_peer_device *peer_device, enum drbd_packet cmd,
1383 struct p_block_req *rp)
1385 _drbd_send_ack(peer_device, cmd, rp->sector, rp->blksize, rp->block_id);
1389 * drbd_send_ack() - Sends an ack packet
1390 * @device: DRBD device
1391 * @cmd: packet command code
1392 * @peer_req: peer request
1394 int drbd_send_ack(struct drbd_peer_device *peer_device, enum drbd_packet cmd,
1395 struct drbd_peer_request *peer_req)
1397 return _drbd_send_ack(peer_device, cmd,
1398 cpu_to_be64(peer_req->i.sector),
1399 cpu_to_be32(peer_req->i.size),
1400 peer_req->block_id);
1403 /* This function misuses the block_id field to signal if the blocks
1404 * are is sync or not. */
1405 int drbd_send_ack_ex(struct drbd_peer_device *peer_device, enum drbd_packet cmd,
1406 sector_t sector, int blksize, u64 block_id)
1408 return _drbd_send_ack(peer_device, cmd,
1409 cpu_to_be64(sector),
1410 cpu_to_be32(blksize),
1411 cpu_to_be64(block_id));
1414 int drbd_send_rs_deallocated(struct drbd_peer_device *peer_device,
1415 struct drbd_peer_request *peer_req)
1417 struct drbd_socket *sock;
1418 struct p_block_desc *p;
1420 sock = &peer_device->connection->data;
1421 p = drbd_prepare_command(peer_device, sock);
1424 p->sector = cpu_to_be64(peer_req->i.sector);
1425 p->blksize = cpu_to_be32(peer_req->i.size);
1427 return drbd_send_command(peer_device, sock, P_RS_DEALLOCATED, sizeof(*p), NULL, 0);
1430 int drbd_send_drequest(struct drbd_peer_device *peer_device, int cmd,
1431 sector_t sector, int size, u64 block_id)
1433 struct drbd_socket *sock;
1434 struct p_block_req *p;
1436 sock = &peer_device->connection->data;
1437 p = drbd_prepare_command(peer_device, sock);
1440 p->sector = cpu_to_be64(sector);
1441 p->block_id = block_id;
1442 p->blksize = cpu_to_be32(size);
1443 return drbd_send_command(peer_device, sock, cmd, sizeof(*p), NULL, 0);
1446 int drbd_send_drequest_csum(struct drbd_peer_device *peer_device, sector_t sector, int size,
1447 void *digest, int digest_size, enum drbd_packet cmd)
1449 struct drbd_socket *sock;
1450 struct p_block_req *p;
1452 /* FIXME: Put the digest into the preallocated socket buffer. */
1454 sock = &peer_device->connection->data;
1455 p = drbd_prepare_command(peer_device, sock);
1458 p->sector = cpu_to_be64(sector);
1459 p->block_id = ID_SYNCER /* unused */;
1460 p->blksize = cpu_to_be32(size);
1461 return drbd_send_command(peer_device, sock, cmd, sizeof(*p), digest, digest_size);
1464 int drbd_send_ov_request(struct drbd_peer_device *peer_device, sector_t sector, int size)
1466 struct drbd_socket *sock;
1467 struct p_block_req *p;
1469 sock = &peer_device->connection->data;
1470 p = drbd_prepare_command(peer_device, sock);
1473 p->sector = cpu_to_be64(sector);
1474 p->block_id = ID_SYNCER /* unused */;
1475 p->blksize = cpu_to_be32(size);
1476 return drbd_send_command(peer_device, sock, P_OV_REQUEST, sizeof(*p), NULL, 0);
1479 /* called on sndtimeo
1480 * returns false if we should retry,
1481 * true if we think connection is dead
1483 static int we_should_drop_the_connection(struct drbd_connection *connection, struct socket *sock)
1486 /* long elapsed = (long)(jiffies - device->last_received); */
1488 drop_it = connection->meta.socket == sock
1489 || !connection->ack_receiver.task
1490 || get_t_state(&connection->ack_receiver) != RUNNING
1491 || connection->cstate < C_WF_REPORT_PARAMS;
1496 drop_it = !--connection->ko_count;
1498 drbd_err(connection, "[%s/%d] sock_sendmsg time expired, ko = %u\n",
1499 current->comm, current->pid, connection->ko_count);
1500 request_ping(connection);
1503 return drop_it; /* && (device->state == R_PRIMARY) */;
1506 static void drbd_update_congested(struct drbd_connection *connection)
1508 struct sock *sk = connection->data.socket->sk;
1509 if (sk->sk_wmem_queued > sk->sk_sndbuf * 4 / 5)
1510 set_bit(NET_CONGESTED, &connection->flags);
1513 /* The idea of sendpage seems to be to put some kind of reference
1514 * to the page into the skb, and to hand it over to the NIC. In
1515 * this process get_page() gets called.
1517 * As soon as the page was really sent over the network put_page()
1518 * gets called by some part of the network layer. [ NIC driver? ]
1520 * [ get_page() / put_page() increment/decrement the count. If count
1521 * reaches 0 the page will be freed. ]
1523 * This works nicely with pages from FSs.
1524 * But this means that in protocol A we might signal IO completion too early!
1526 * In order not to corrupt data during a resync we must make sure
1527 * that we do not reuse our own buffer pages (EEs) to early, therefore
1528 * we have the net_ee list.
1530 * XFS seems to have problems, still, it submits pages with page_count == 0!
1531 * As a workaround, we disable sendpage on pages
1532 * with page_count == 0 or PageSlab.
1534 static int _drbd_no_send_page(struct drbd_peer_device *peer_device, struct page *page,
1535 int offset, size_t size, unsigned msg_flags)
1537 struct socket *socket;
1541 socket = peer_device->connection->data.socket;
1542 addr = kmap(page) + offset;
1543 err = drbd_send_all(peer_device->connection, socket, addr, size, msg_flags);
1546 peer_device->device->send_cnt += size >> 9;
1550 static int _drbd_send_page(struct drbd_peer_device *peer_device, struct page *page,
1551 int offset, size_t size, unsigned msg_flags)
1553 struct socket *socket = peer_device->connection->data.socket;
1557 /* e.g. XFS meta- & log-data is in slab pages, which have a
1558 * page_count of 0 and/or have PageSlab() set.
1559 * we cannot use send_page for those, as that does get_page();
1560 * put_page(); and would cause either a VM_BUG directly, or
1561 * __page_cache_release a page that would actually still be referenced
1562 * by someone, leading to some obscure delayed Oops somewhere else. */
1563 if (disable_sendpage || (page_count(page) < 1) || PageSlab(page))
1564 return _drbd_no_send_page(peer_device, page, offset, size, msg_flags);
1566 msg_flags |= MSG_NOSIGNAL;
1567 drbd_update_congested(peer_device->connection);
1571 sent = socket->ops->sendpage(socket, page, offset, len, msg_flags);
1573 if (sent == -EAGAIN) {
1574 if (we_should_drop_the_connection(peer_device->connection, socket))
1578 drbd_warn(peer_device->device, "%s: size=%d len=%d sent=%d\n",
1579 __func__, (int)size, len, sent);
1586 } while (len > 0 /* THINK && device->cstate >= C_CONNECTED*/);
1587 clear_bit(NET_CONGESTED, &peer_device->connection->flags);
1591 peer_device->device->send_cnt += size >> 9;
1596 static int _drbd_send_bio(struct drbd_peer_device *peer_device, struct bio *bio)
1598 struct bio_vec bvec;
1599 struct bvec_iter iter;
1601 /* hint all but last page with MSG_MORE */
1602 bio_for_each_segment(bvec, bio, iter) {
1605 err = _drbd_no_send_page(peer_device, bvec.bv_page,
1606 bvec.bv_offset, bvec.bv_len,
1607 bio_iter_last(bvec, iter)
1611 /* REQ_OP_WRITE_SAME has only one segment */
1612 if (bio_op(bio) == REQ_OP_WRITE_SAME)
1618 static int _drbd_send_zc_bio(struct drbd_peer_device *peer_device, struct bio *bio)
1620 struct bio_vec bvec;
1621 struct bvec_iter iter;
1623 /* hint all but last page with MSG_MORE */
1624 bio_for_each_segment(bvec, bio, iter) {
1627 err = _drbd_send_page(peer_device, bvec.bv_page,
1628 bvec.bv_offset, bvec.bv_len,
1629 bio_iter_last(bvec, iter) ? 0 : MSG_MORE);
1632 /* REQ_OP_WRITE_SAME has only one segment */
1633 if (bio_op(bio) == REQ_OP_WRITE_SAME)
1639 static int _drbd_send_zc_ee(struct drbd_peer_device *peer_device,
1640 struct drbd_peer_request *peer_req)
1642 struct page *page = peer_req->pages;
1643 unsigned len = peer_req->i.size;
1646 /* hint all but last page with MSG_MORE */
1647 page_chain_for_each(page) {
1648 unsigned l = min_t(unsigned, len, PAGE_SIZE);
1650 err = _drbd_send_page(peer_device, page, 0, l,
1651 page_chain_next(page) ? MSG_MORE : 0);
1659 static u32 bio_flags_to_wire(struct drbd_connection *connection,
1662 if (connection->agreed_pro_version >= 95)
1663 return (bio->bi_opf & REQ_SYNC ? DP_RW_SYNC : 0) |
1664 (bio->bi_opf & REQ_FUA ? DP_FUA : 0) |
1665 (bio->bi_opf & REQ_PREFLUSH ? DP_FLUSH : 0) |
1666 (bio_op(bio) == REQ_OP_WRITE_SAME ? DP_WSAME : 0) |
1667 (bio_op(bio) == REQ_OP_DISCARD ? DP_DISCARD : 0) |
1668 (bio_op(bio) == REQ_OP_WRITE_ZEROES ? DP_DISCARD : 0);
1670 return bio->bi_opf & REQ_SYNC ? DP_RW_SYNC : 0;
1673 /* Used to send write or TRIM aka REQ_DISCARD requests
1674 * R_PRIMARY -> Peer (P_DATA, P_TRIM)
1676 int drbd_send_dblock(struct drbd_peer_device *peer_device, struct drbd_request *req)
1678 struct drbd_device *device = peer_device->device;
1679 struct drbd_socket *sock;
1681 struct p_wsame *wsame = NULL;
1683 unsigned int dp_flags = 0;
1687 sock = &peer_device->connection->data;
1688 p = drbd_prepare_command(peer_device, sock);
1689 digest_size = peer_device->connection->integrity_tfm ?
1690 crypto_ahash_digestsize(peer_device->connection->integrity_tfm) : 0;
1694 p->sector = cpu_to_be64(req->i.sector);
1695 p->block_id = (unsigned long)req;
1696 p->seq_num = cpu_to_be32(atomic_inc_return(&device->packet_seq));
1697 dp_flags = bio_flags_to_wire(peer_device->connection, req->master_bio);
1698 if (device->state.conn >= C_SYNC_SOURCE &&
1699 device->state.conn <= C_PAUSED_SYNC_T)
1700 dp_flags |= DP_MAY_SET_IN_SYNC;
1701 if (peer_device->connection->agreed_pro_version >= 100) {
1702 if (req->rq_state & RQ_EXP_RECEIVE_ACK)
1703 dp_flags |= DP_SEND_RECEIVE_ACK;
1704 /* During resync, request an explicit write ack,
1705 * even in protocol != C */
1706 if (req->rq_state & RQ_EXP_WRITE_ACK
1707 || (dp_flags & DP_MAY_SET_IN_SYNC))
1708 dp_flags |= DP_SEND_WRITE_ACK;
1710 p->dp_flags = cpu_to_be32(dp_flags);
1712 if (dp_flags & DP_DISCARD) {
1713 struct p_trim *t = (struct p_trim*)p;
1714 t->size = cpu_to_be32(req->i.size);
1715 err = __send_command(peer_device->connection, device->vnr, sock, P_TRIM, sizeof(*t), NULL, 0);
1718 if (dp_flags & DP_WSAME) {
1719 /* this will only work if DRBD_FF_WSAME is set AND the
1720 * handshake agreed that all nodes and backend devices are
1721 * WRITE_SAME capable and agree on logical_block_size */
1722 wsame = (struct p_wsame*)p;
1723 digest_out = wsame + 1;
1724 wsame->size = cpu_to_be32(req->i.size);
1728 /* our digest is still only over the payload.
1729 * TRIM does not carry any payload. */
1731 drbd_csum_bio(peer_device->connection->integrity_tfm, req->master_bio, digest_out);
1734 __send_command(peer_device->connection, device->vnr, sock, P_WSAME,
1735 sizeof(*wsame) + digest_size, NULL,
1736 bio_iovec(req->master_bio).bv_len);
1739 __send_command(peer_device->connection, device->vnr, sock, P_DATA,
1740 sizeof(*p) + digest_size, NULL, req->i.size);
1742 /* For protocol A, we have to memcpy the payload into
1743 * socket buffers, as we may complete right away
1744 * as soon as we handed it over to tcp, at which point the data
1745 * pages may become invalid.
1747 * For data-integrity enabled, we copy it as well, so we can be
1748 * sure that even if the bio pages may still be modified, it
1749 * won't change the data on the wire, thus if the digest checks
1750 * out ok after sending on this side, but does not fit on the
1751 * receiving side, we sure have detected corruption elsewhere.
1753 if (!(req->rq_state & (RQ_EXP_RECEIVE_ACK | RQ_EXP_WRITE_ACK)) || digest_size)
1754 err = _drbd_send_bio(peer_device, req->master_bio);
1756 err = _drbd_send_zc_bio(peer_device, req->master_bio);
1758 /* double check digest, sometimes buffers have been modified in flight. */
1759 if (digest_size > 0 && digest_size <= 64) {
1760 /* 64 byte, 512 bit, is the largest digest size
1761 * currently supported in kernel crypto. */
1762 unsigned char digest[64];
1763 drbd_csum_bio(peer_device->connection->integrity_tfm, req->master_bio, digest);
1764 if (memcmp(p + 1, digest, digest_size)) {
1766 "Digest mismatch, buffer modified by upper layers during write: %llus +%u\n",
1767 (unsigned long long)req->i.sector, req->i.size);
1769 } /* else if (digest_size > 64) {
1770 ... Be noisy about digest too large ...
1774 mutex_unlock(&sock->mutex); /* locked by drbd_prepare_command() */
1779 /* answer packet, used to send data back for read requests:
1780 * Peer -> (diskless) R_PRIMARY (P_DATA_REPLY)
1781 * C_SYNC_SOURCE -> C_SYNC_TARGET (P_RS_DATA_REPLY)
1783 int drbd_send_block(struct drbd_peer_device *peer_device, enum drbd_packet cmd,
1784 struct drbd_peer_request *peer_req)
1786 struct drbd_device *device = peer_device->device;
1787 struct drbd_socket *sock;
1792 sock = &peer_device->connection->data;
1793 p = drbd_prepare_command(peer_device, sock);
1795 digest_size = peer_device->connection->integrity_tfm ?
1796 crypto_ahash_digestsize(peer_device->connection->integrity_tfm) : 0;
1800 p->sector = cpu_to_be64(peer_req->i.sector);
1801 p->block_id = peer_req->block_id;
1802 p->seq_num = 0; /* unused */
1805 drbd_csum_ee(peer_device->connection->integrity_tfm, peer_req, p + 1);
1806 err = __send_command(peer_device->connection, device->vnr, sock, cmd, sizeof(*p) + digest_size, NULL, peer_req->i.size);
1808 err = _drbd_send_zc_ee(peer_device, peer_req);
1809 mutex_unlock(&sock->mutex); /* locked by drbd_prepare_command() */
1814 int drbd_send_out_of_sync(struct drbd_peer_device *peer_device, struct drbd_request *req)
1816 struct drbd_socket *sock;
1817 struct p_block_desc *p;
1819 sock = &peer_device->connection->data;
1820 p = drbd_prepare_command(peer_device, sock);
1823 p->sector = cpu_to_be64(req->i.sector);
1824 p->blksize = cpu_to_be32(req->i.size);
1825 return drbd_send_command(peer_device, sock, P_OUT_OF_SYNC, sizeof(*p), NULL, 0);
1829 drbd_send distinguishes two cases:
1831 Packets sent via the data socket "sock"
1832 and packets sent via the meta data socket "msock"
1835 -----------------+-------------------------+------------------------------
1836 timeout conf.timeout / 2 conf.timeout / 2
1837 timeout action send a ping via msock Abort communication
1838 and close all sockets
1842 * you must have down()ed the appropriate [m]sock_mutex elsewhere!
1844 int drbd_send(struct drbd_connection *connection, struct socket *sock,
1845 void *buf, size_t size, unsigned msg_flags)
1847 struct kvec iov = {.iov_base = buf, .iov_len = size};
1854 /* THINK if (signal_pending) return ... ? */
1856 msg.msg_name = NULL;
1857 msg.msg_namelen = 0;
1858 msg.msg_control = NULL;
1859 msg.msg_controllen = 0;
1860 msg.msg_flags = msg_flags | MSG_NOSIGNAL;
1862 iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, &iov, 1, size);
1864 if (sock == connection->data.socket) {
1866 connection->ko_count = rcu_dereference(connection->net_conf)->ko_count;
1868 drbd_update_congested(connection);
1871 rv = sock_sendmsg(sock, &msg);
1872 if (rv == -EAGAIN) {
1873 if (we_should_drop_the_connection(connection, sock))
1879 flush_signals(current);
1885 } while (sent < size);
1887 if (sock == connection->data.socket)
1888 clear_bit(NET_CONGESTED, &connection->flags);
1891 if (rv != -EAGAIN) {
1892 drbd_err(connection, "%s_sendmsg returned %d\n",
1893 sock == connection->meta.socket ? "msock" : "sock",
1895 conn_request_state(connection, NS(conn, C_BROKEN_PIPE), CS_HARD);
1897 conn_request_state(connection, NS(conn, C_TIMEOUT), CS_HARD);
1904 * drbd_send_all - Send an entire buffer
1906 * Returns 0 upon success and a negative error value otherwise.
1908 int drbd_send_all(struct drbd_connection *connection, struct socket *sock, void *buffer,
1909 size_t size, unsigned msg_flags)
1913 err = drbd_send(connection, sock, buffer, size, msg_flags);
1921 static int drbd_open(struct block_device *bdev, fmode_t mode)
1923 struct drbd_device *device = bdev->bd_disk->private_data;
1924 unsigned long flags;
1927 mutex_lock(&drbd_main_mutex);
1928 spin_lock_irqsave(&device->resource->req_lock, flags);
1929 /* to have a stable device->state.role
1930 * and no race with updating open_cnt */
1932 if (device->state.role != R_PRIMARY) {
1933 if (mode & FMODE_WRITE)
1935 else if (!allow_oos)
1941 spin_unlock_irqrestore(&device->resource->req_lock, flags);
1942 mutex_unlock(&drbd_main_mutex);
1947 static void drbd_release(struct gendisk *gd, fmode_t mode)
1949 struct drbd_device *device = gd->private_data;
1950 mutex_lock(&drbd_main_mutex);
1952 mutex_unlock(&drbd_main_mutex);
1955 static void drbd_set_defaults(struct drbd_device *device)
1957 /* Beware! The actual layout differs
1958 * between big endian and little endian */
1959 device->state = (union drbd_dev_state) {
1960 { .role = R_SECONDARY,
1962 .conn = C_STANDALONE,
1968 void drbd_init_set_defaults(struct drbd_device *device)
1970 /* the memset(,0,) did most of this.
1971 * note: only assignments, no allocation in here */
1973 drbd_set_defaults(device);
1975 atomic_set(&device->ap_bio_cnt, 0);
1976 atomic_set(&device->ap_actlog_cnt, 0);
1977 atomic_set(&device->ap_pending_cnt, 0);
1978 atomic_set(&device->rs_pending_cnt, 0);
1979 atomic_set(&device->unacked_cnt, 0);
1980 atomic_set(&device->local_cnt, 0);
1981 atomic_set(&device->pp_in_use_by_net, 0);
1982 atomic_set(&device->rs_sect_in, 0);
1983 atomic_set(&device->rs_sect_ev, 0);
1984 atomic_set(&device->ap_in_flight, 0);
1985 atomic_set(&device->md_io.in_use, 0);
1987 mutex_init(&device->own_state_mutex);
1988 device->state_mutex = &device->own_state_mutex;
1990 spin_lock_init(&device->al_lock);
1991 spin_lock_init(&device->peer_seq_lock);
1993 INIT_LIST_HEAD(&device->active_ee);
1994 INIT_LIST_HEAD(&device->sync_ee);
1995 INIT_LIST_HEAD(&device->done_ee);
1996 INIT_LIST_HEAD(&device->read_ee);
1997 INIT_LIST_HEAD(&device->net_ee);
1998 INIT_LIST_HEAD(&device->resync_reads);
1999 INIT_LIST_HEAD(&device->resync_work.list);
2000 INIT_LIST_HEAD(&device->unplug_work.list);
2001 INIT_LIST_HEAD(&device->bm_io_work.w.list);
2002 INIT_LIST_HEAD(&device->pending_master_completion[0]);
2003 INIT_LIST_HEAD(&device->pending_master_completion[1]);
2004 INIT_LIST_HEAD(&device->pending_completion[0]);
2005 INIT_LIST_HEAD(&device->pending_completion[1]);
2007 device->resync_work.cb = w_resync_timer;
2008 device->unplug_work.cb = w_send_write_hint;
2009 device->bm_io_work.w.cb = w_bitmap_io;
2011 init_timer(&device->resync_timer);
2012 init_timer(&device->md_sync_timer);
2013 init_timer(&device->start_resync_timer);
2014 init_timer(&device->request_timer);
2015 device->resync_timer.function = resync_timer_fn;
2016 device->resync_timer.data = (unsigned long) device;
2017 device->md_sync_timer.function = md_sync_timer_fn;
2018 device->md_sync_timer.data = (unsigned long) device;
2019 device->start_resync_timer.function = start_resync_timer_fn;
2020 device->start_resync_timer.data = (unsigned long) device;
2021 device->request_timer.function = request_timer_fn;
2022 device->request_timer.data = (unsigned long) device;
2024 init_waitqueue_head(&device->misc_wait);
2025 init_waitqueue_head(&device->state_wait);
2026 init_waitqueue_head(&device->ee_wait);
2027 init_waitqueue_head(&device->al_wait);
2028 init_waitqueue_head(&device->seq_wait);
2030 device->resync_wenr = LC_FREE;
2031 device->peer_max_bio_size = DRBD_MAX_BIO_SIZE_SAFE;
2032 device->local_max_bio_size = DRBD_MAX_BIO_SIZE_SAFE;
2035 void drbd_device_cleanup(struct drbd_device *device)
2038 if (first_peer_device(device)->connection->receiver.t_state != NONE)
2039 drbd_err(device, "ASSERT FAILED: receiver t_state == %d expected 0.\n",
2040 first_peer_device(device)->connection->receiver.t_state);
2042 device->al_writ_cnt =
2043 device->bm_writ_cnt =
2051 device->rs_failed = 0;
2052 device->rs_last_events = 0;
2053 device->rs_last_sect_ev = 0;
2054 for (i = 0; i < DRBD_SYNC_MARKS; i++) {
2055 device->rs_mark_left[i] = 0;
2056 device->rs_mark_time[i] = 0;
2058 D_ASSERT(device, first_peer_device(device)->connection->net_conf == NULL);
2060 drbd_set_my_capacity(device, 0);
2061 if (device->bitmap) {
2062 /* maybe never allocated. */
2063 drbd_bm_resize(device, 0, 1);
2064 drbd_bm_cleanup(device);
2067 drbd_backing_dev_free(device, device->ldev);
2068 device->ldev = NULL;
2070 clear_bit(AL_SUSPENDED, &device->flags);
2072 D_ASSERT(device, list_empty(&device->active_ee));
2073 D_ASSERT(device, list_empty(&device->sync_ee));
2074 D_ASSERT(device, list_empty(&device->done_ee));
2075 D_ASSERT(device, list_empty(&device->read_ee));
2076 D_ASSERT(device, list_empty(&device->net_ee));
2077 D_ASSERT(device, list_empty(&device->resync_reads));
2078 D_ASSERT(device, list_empty(&first_peer_device(device)->connection->sender_work.q));
2079 D_ASSERT(device, list_empty(&device->resync_work.list));
2080 D_ASSERT(device, list_empty(&device->unplug_work.list));
2082 drbd_set_defaults(device);
2086 static void drbd_destroy_mempools(void)
2090 while (drbd_pp_pool) {
2091 page = drbd_pp_pool;
2092 drbd_pp_pool = (struct page *)page_private(page);
2097 /* D_ASSERT(device, atomic_read(&drbd_pp_vacant)==0); */
2099 if (drbd_io_bio_set)
2100 bioset_free(drbd_io_bio_set);
2101 if (drbd_md_io_bio_set)
2102 bioset_free(drbd_md_io_bio_set);
2103 if (drbd_md_io_page_pool)
2104 mempool_destroy(drbd_md_io_page_pool);
2105 if (drbd_ee_mempool)
2106 mempool_destroy(drbd_ee_mempool);
2107 if (drbd_request_mempool)
2108 mempool_destroy(drbd_request_mempool);
2110 kmem_cache_destroy(drbd_ee_cache);
2111 if (drbd_request_cache)
2112 kmem_cache_destroy(drbd_request_cache);
2113 if (drbd_bm_ext_cache)
2114 kmem_cache_destroy(drbd_bm_ext_cache);
2115 if (drbd_al_ext_cache)
2116 kmem_cache_destroy(drbd_al_ext_cache);
2118 drbd_io_bio_set = NULL;
2119 drbd_md_io_bio_set = NULL;
2120 drbd_md_io_page_pool = NULL;
2121 drbd_ee_mempool = NULL;
2122 drbd_request_mempool = NULL;
2123 drbd_ee_cache = NULL;
2124 drbd_request_cache = NULL;
2125 drbd_bm_ext_cache = NULL;
2126 drbd_al_ext_cache = NULL;
2131 static int drbd_create_mempools(void)
2134 const int number = (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * minor_count;
2137 /* prepare our caches and mempools */
2138 drbd_request_mempool = NULL;
2139 drbd_ee_cache = NULL;
2140 drbd_request_cache = NULL;
2141 drbd_bm_ext_cache = NULL;
2142 drbd_al_ext_cache = NULL;
2143 drbd_pp_pool = NULL;
2144 drbd_md_io_page_pool = NULL;
2145 drbd_md_io_bio_set = NULL;
2146 drbd_io_bio_set = NULL;
2149 drbd_request_cache = kmem_cache_create(
2150 "drbd_req", sizeof(struct drbd_request), 0, 0, NULL);
2151 if (drbd_request_cache == NULL)
2154 drbd_ee_cache = kmem_cache_create(
2155 "drbd_ee", sizeof(struct drbd_peer_request), 0, 0, NULL);
2156 if (drbd_ee_cache == NULL)
2159 drbd_bm_ext_cache = kmem_cache_create(
2160 "drbd_bm", sizeof(struct bm_extent), 0, 0, NULL);
2161 if (drbd_bm_ext_cache == NULL)
2164 drbd_al_ext_cache = kmem_cache_create(
2165 "drbd_al", sizeof(struct lc_element), 0, 0, NULL);
2166 if (drbd_al_ext_cache == NULL)
2170 drbd_io_bio_set = bioset_create(BIO_POOL_SIZE, 0, BIOSET_NEED_RESCUER);
2171 if (drbd_io_bio_set == NULL)
2174 drbd_md_io_bio_set = bioset_create(DRBD_MIN_POOL_PAGES, 0,
2176 BIOSET_NEED_RESCUER);
2177 if (drbd_md_io_bio_set == NULL)
2180 drbd_md_io_page_pool = mempool_create_page_pool(DRBD_MIN_POOL_PAGES, 0);
2181 if (drbd_md_io_page_pool == NULL)
2184 drbd_request_mempool = mempool_create_slab_pool(number,
2185 drbd_request_cache);
2186 if (drbd_request_mempool == NULL)
2189 drbd_ee_mempool = mempool_create_slab_pool(number, drbd_ee_cache);
2190 if (drbd_ee_mempool == NULL)
2193 /* drbd's page pool */
2194 spin_lock_init(&drbd_pp_lock);
2196 for (i = 0; i < number; i++) {
2197 page = alloc_page(GFP_HIGHUSER);
2200 set_page_private(page, (unsigned long)drbd_pp_pool);
2201 drbd_pp_pool = page;
2203 drbd_pp_vacant = number;
2208 drbd_destroy_mempools(); /* in case we allocated some */
2212 static void drbd_release_all_peer_reqs(struct drbd_device *device)
2216 rr = drbd_free_peer_reqs(device, &device->active_ee);
2218 drbd_err(device, "%d EEs in active list found!\n", rr);
2220 rr = drbd_free_peer_reqs(device, &device->sync_ee);
2222 drbd_err(device, "%d EEs in sync list found!\n", rr);
2224 rr = drbd_free_peer_reqs(device, &device->read_ee);
2226 drbd_err(device, "%d EEs in read list found!\n", rr);
2228 rr = drbd_free_peer_reqs(device, &device->done_ee);
2230 drbd_err(device, "%d EEs in done list found!\n", rr);
2232 rr = drbd_free_peer_reqs(device, &device->net_ee);
2234 drbd_err(device, "%d EEs in net list found!\n", rr);
2237 /* caution. no locking. */
2238 void drbd_destroy_device(struct kref *kref)
2240 struct drbd_device *device = container_of(kref, struct drbd_device, kref);
2241 struct drbd_resource *resource = device->resource;
2242 struct drbd_peer_device *peer_device, *tmp_peer_device;
2244 del_timer_sync(&device->request_timer);
2246 /* paranoia asserts */
2247 D_ASSERT(device, device->open_cnt == 0);
2248 /* end paranoia asserts */
2250 /* cleanup stuff that may have been allocated during
2251 * device (re-)configuration or state changes */
2253 if (device->this_bdev)
2254 bdput(device->this_bdev);
2256 drbd_backing_dev_free(device, device->ldev);
2257 device->ldev = NULL;
2259 drbd_release_all_peer_reqs(device);
2261 lc_destroy(device->act_log);
2262 lc_destroy(device->resync);
2264 kfree(device->p_uuid);
2265 /* device->p_uuid = NULL; */
2267 if (device->bitmap) /* should no longer be there. */
2268 drbd_bm_cleanup(device);
2269 __free_page(device->md_io.page);
2270 put_disk(device->vdisk);
2271 blk_cleanup_queue(device->rq_queue);
2272 kfree(device->rs_plan_s);
2274 /* not for_each_connection(connection, resource):
2275 * those may have been cleaned up and disassociated already.
2277 for_each_peer_device_safe(peer_device, tmp_peer_device, device) {
2278 kref_put(&peer_device->connection->kref, drbd_destroy_connection);
2281 memset(device, 0xfd, sizeof(*device));
2283 kref_put(&resource->kref, drbd_destroy_resource);
2286 /* One global retry thread, if we need to push back some bio and have it
2287 * reinserted through our make request function.
2289 static struct retry_worker {
2290 struct workqueue_struct *wq;
2291 struct work_struct worker;
2294 struct list_head writes;
2297 static void do_retry(struct work_struct *ws)
2299 struct retry_worker *retry = container_of(ws, struct retry_worker, worker);
2301 struct drbd_request *req, *tmp;
2303 spin_lock_irq(&retry->lock);
2304 list_splice_init(&retry->writes, &writes);
2305 spin_unlock_irq(&retry->lock);
2307 list_for_each_entry_safe(req, tmp, &writes, tl_requests) {
2308 struct drbd_device *device = req->device;
2309 struct bio *bio = req->master_bio;
2310 unsigned long start_jif = req->start_jif;
2314 expect(atomic_read(&req->completion_ref) == 0) &&
2315 expect(req->rq_state & RQ_POSTPONED) &&
2316 expect((req->rq_state & RQ_LOCAL_PENDING) == 0 ||
2317 (req->rq_state & RQ_LOCAL_ABORTED) != 0);
2320 drbd_err(device, "req=%p completion_ref=%d rq_state=%x\n",
2321 req, atomic_read(&req->completion_ref),
2324 /* We still need to put one kref associated with the
2325 * "completion_ref" going zero in the code path that queued it
2326 * here. The request object may still be referenced by a
2327 * frozen local req->private_bio, in case we force-detached.
2329 kref_put(&req->kref, drbd_req_destroy);
2331 /* A single suspended or otherwise blocking device may stall
2332 * all others as well. Fortunately, this code path is to
2333 * recover from a situation that "should not happen":
2334 * concurrent writes in multi-primary setup.
2335 * In a "normal" lifecycle, this workqueue is supposed to be
2336 * destroyed without ever doing anything.
2337 * If it turns out to be an issue anyways, we can do per
2338 * resource (replication group) or per device (minor) retry
2339 * workqueues instead.
2342 /* We are not just doing generic_make_request(),
2343 * as we want to keep the start_time information. */
2345 __drbd_make_request(device, bio, start_jif);
2349 /* called via drbd_req_put_completion_ref(),
2350 * holds resource->req_lock */
2351 void drbd_restart_request(struct drbd_request *req)
2353 unsigned long flags;
2354 spin_lock_irqsave(&retry.lock, flags);
2355 list_move_tail(&req->tl_requests, &retry.writes);
2356 spin_unlock_irqrestore(&retry.lock, flags);
2358 /* Drop the extra reference that would otherwise
2359 * have been dropped by complete_master_bio.
2360 * do_retry() needs to grab a new one. */
2361 dec_ap_bio(req->device);
2363 queue_work(retry.wq, &retry.worker);
2366 void drbd_destroy_resource(struct kref *kref)
2368 struct drbd_resource *resource =
2369 container_of(kref, struct drbd_resource, kref);
2371 idr_destroy(&resource->devices);
2372 free_cpumask_var(resource->cpu_mask);
2373 kfree(resource->name);
2374 memset(resource, 0xf2, sizeof(*resource));
2378 void drbd_free_resource(struct drbd_resource *resource)
2380 struct drbd_connection *connection, *tmp;
2382 for_each_connection_safe(connection, tmp, resource) {
2383 list_del(&connection->connections);
2384 drbd_debugfs_connection_cleanup(connection);
2385 kref_put(&connection->kref, drbd_destroy_connection);
2387 drbd_debugfs_resource_cleanup(resource);
2388 kref_put(&resource->kref, drbd_destroy_resource);
2391 static void drbd_cleanup(void)
2394 struct drbd_device *device;
2395 struct drbd_resource *resource, *tmp;
2397 /* first remove proc,
2398 * drbdsetup uses it's presence to detect
2399 * whether DRBD is loaded.
2400 * If we would get stuck in proc removal,
2401 * but have netlink already deregistered,
2402 * some drbdsetup commands may wait forever
2406 remove_proc_entry("drbd", NULL);
2409 destroy_workqueue(retry.wq);
2411 drbd_genl_unregister();
2412 drbd_debugfs_cleanup();
2414 idr_for_each_entry(&drbd_devices, device, i)
2415 drbd_delete_device(device);
2417 /* not _rcu since, no other updater anymore. Genl already unregistered */
2418 for_each_resource_safe(resource, tmp, &drbd_resources) {
2419 list_del(&resource->resources);
2420 drbd_free_resource(resource);
2423 drbd_destroy_mempools();
2424 unregister_blkdev(DRBD_MAJOR, "drbd");
2426 idr_destroy(&drbd_devices);
2428 pr_info("module cleanup done.\n");
2432 * drbd_congested() - Callback for the flusher thread
2433 * @congested_data: User data
2434 * @bdi_bits: Bits the BDI flusher thread is currently interested in
2436 * Returns 1<<WB_async_congested and/or 1<<WB_sync_congested if we are congested.
2438 static int drbd_congested(void *congested_data, int bdi_bits)
2440 struct drbd_device *device = congested_data;
2441 struct request_queue *q;
2445 if (!may_inc_ap_bio(device)) {
2446 /* DRBD has frozen IO */
2452 if (test_bit(CALLBACK_PENDING, &first_peer_device(device)->connection->flags)) {
2453 r |= (1 << WB_async_congested);
2454 /* Without good local data, we would need to read from remote,
2455 * and that would need the worker thread as well, which is
2456 * currently blocked waiting for that usermode helper to
2459 if (!get_ldev_if_state(device, D_UP_TO_DATE))
2460 r |= (1 << WB_sync_congested);
2468 if (get_ldev(device)) {
2469 q = bdev_get_queue(device->ldev->backing_bdev);
2470 r = bdi_congested(q->backing_dev_info, bdi_bits);
2476 if (bdi_bits & (1 << WB_async_congested) &&
2477 test_bit(NET_CONGESTED, &first_peer_device(device)->connection->flags)) {
2478 r |= (1 << WB_async_congested);
2479 reason = reason == 'b' ? 'a' : 'n';
2483 device->congestion_reason = reason;
2487 static void drbd_init_workqueue(struct drbd_work_queue* wq)
2489 spin_lock_init(&wq->q_lock);
2490 INIT_LIST_HEAD(&wq->q);
2491 init_waitqueue_head(&wq->q_wait);
2494 struct completion_work {
2496 struct completion done;
2499 static int w_complete(struct drbd_work *w, int cancel)
2501 struct completion_work *completion_work =
2502 container_of(w, struct completion_work, w);
2504 complete(&completion_work->done);
2508 void drbd_flush_workqueue(struct drbd_work_queue *work_queue)
2510 struct completion_work completion_work;
2512 completion_work.w.cb = w_complete;
2513 init_completion(&completion_work.done);
2514 drbd_queue_work(work_queue, &completion_work.w);
2515 wait_for_completion(&completion_work.done);
2518 struct drbd_resource *drbd_find_resource(const char *name)
2520 struct drbd_resource *resource;
2522 if (!name || !name[0])
2526 for_each_resource_rcu(resource, &drbd_resources) {
2527 if (!strcmp(resource->name, name)) {
2528 kref_get(&resource->kref);
2538 struct drbd_connection *conn_get_by_addrs(void *my_addr, int my_addr_len,
2539 void *peer_addr, int peer_addr_len)
2541 struct drbd_resource *resource;
2542 struct drbd_connection *connection;
2545 for_each_resource_rcu(resource, &drbd_resources) {
2546 for_each_connection_rcu(connection, resource) {
2547 if (connection->my_addr_len == my_addr_len &&
2548 connection->peer_addr_len == peer_addr_len &&
2549 !memcmp(&connection->my_addr, my_addr, my_addr_len) &&
2550 !memcmp(&connection->peer_addr, peer_addr, peer_addr_len)) {
2551 kref_get(&connection->kref);
2562 static int drbd_alloc_socket(struct drbd_socket *socket)
2564 socket->rbuf = (void *) __get_free_page(GFP_KERNEL);
2567 socket->sbuf = (void *) __get_free_page(GFP_KERNEL);
2573 static void drbd_free_socket(struct drbd_socket *socket)
2575 free_page((unsigned long) socket->sbuf);
2576 free_page((unsigned long) socket->rbuf);
2579 void conn_free_crypto(struct drbd_connection *connection)
2581 drbd_free_sock(connection);
2583 crypto_free_ahash(connection->csums_tfm);
2584 crypto_free_ahash(connection->verify_tfm);
2585 crypto_free_shash(connection->cram_hmac_tfm);
2586 crypto_free_ahash(connection->integrity_tfm);
2587 crypto_free_ahash(connection->peer_integrity_tfm);
2588 kfree(connection->int_dig_in);
2589 kfree(connection->int_dig_vv);
2591 connection->csums_tfm = NULL;
2592 connection->verify_tfm = NULL;
2593 connection->cram_hmac_tfm = NULL;
2594 connection->integrity_tfm = NULL;
2595 connection->peer_integrity_tfm = NULL;
2596 connection->int_dig_in = NULL;
2597 connection->int_dig_vv = NULL;
2600 int set_resource_options(struct drbd_resource *resource, struct res_opts *res_opts)
2602 struct drbd_connection *connection;
2603 cpumask_var_t new_cpu_mask;
2606 if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL))
2609 /* silently ignore cpu mask on UP kernel */
2610 if (nr_cpu_ids > 1 && res_opts->cpu_mask[0] != 0) {
2611 err = bitmap_parse(res_opts->cpu_mask, DRBD_CPU_MASK_SIZE,
2612 cpumask_bits(new_cpu_mask), nr_cpu_ids);
2613 if (err == -EOVERFLOW) {
2614 /* So what. mask it out. */
2615 cpumask_var_t tmp_cpu_mask;
2616 if (zalloc_cpumask_var(&tmp_cpu_mask, GFP_KERNEL)) {
2617 cpumask_setall(tmp_cpu_mask);
2618 cpumask_and(new_cpu_mask, new_cpu_mask, tmp_cpu_mask);
2619 drbd_warn(resource, "Overflow in bitmap_parse(%.12s%s), truncating to %u bits\n",
2621 strlen(res_opts->cpu_mask) > 12 ? "..." : "",
2623 free_cpumask_var(tmp_cpu_mask);
2628 drbd_warn(resource, "bitmap_parse() failed with %d\n", err);
2629 /* retcode = ERR_CPU_MASK_PARSE; */
2633 resource->res_opts = *res_opts;
2634 if (cpumask_empty(new_cpu_mask))
2635 drbd_calc_cpu_mask(&new_cpu_mask);
2636 if (!cpumask_equal(resource->cpu_mask, new_cpu_mask)) {
2637 cpumask_copy(resource->cpu_mask, new_cpu_mask);
2638 for_each_connection_rcu(connection, resource) {
2639 connection->receiver.reset_cpu_mask = 1;
2640 connection->ack_receiver.reset_cpu_mask = 1;
2641 connection->worker.reset_cpu_mask = 1;
2647 free_cpumask_var(new_cpu_mask);
2652 struct drbd_resource *drbd_create_resource(const char *name)
2654 struct drbd_resource *resource;
2656 resource = kzalloc(sizeof(struct drbd_resource), GFP_KERNEL);
2659 resource->name = kstrdup(name, GFP_KERNEL);
2660 if (!resource->name)
2661 goto fail_free_resource;
2662 if (!zalloc_cpumask_var(&resource->cpu_mask, GFP_KERNEL))
2663 goto fail_free_name;
2664 kref_init(&resource->kref);
2665 idr_init(&resource->devices);
2666 INIT_LIST_HEAD(&resource->connections);
2667 resource->write_ordering = WO_BDEV_FLUSH;
2668 list_add_tail_rcu(&resource->resources, &drbd_resources);
2669 mutex_init(&resource->conf_update);
2670 mutex_init(&resource->adm_mutex);
2671 spin_lock_init(&resource->req_lock);
2672 drbd_debugfs_resource_add(resource);
2676 kfree(resource->name);
2683 /* caller must be under adm_mutex */
2684 struct drbd_connection *conn_create(const char *name, struct res_opts *res_opts)
2686 struct drbd_resource *resource;
2687 struct drbd_connection *connection;
2689 connection = kzalloc(sizeof(struct drbd_connection), GFP_KERNEL);
2693 if (drbd_alloc_socket(&connection->data))
2695 if (drbd_alloc_socket(&connection->meta))
2698 connection->current_epoch = kzalloc(sizeof(struct drbd_epoch), GFP_KERNEL);
2699 if (!connection->current_epoch)
2702 INIT_LIST_HEAD(&connection->transfer_log);
2704 INIT_LIST_HEAD(&connection->current_epoch->list);
2705 connection->epochs = 1;
2706 spin_lock_init(&connection->epoch_lock);
2708 connection->send.seen_any_write_yet = false;
2709 connection->send.current_epoch_nr = 0;
2710 connection->send.current_epoch_writes = 0;
2712 resource = drbd_create_resource(name);
2716 connection->cstate = C_STANDALONE;
2717 mutex_init(&connection->cstate_mutex);
2718 init_waitqueue_head(&connection->ping_wait);
2719 idr_init(&connection->peer_devices);
2721 drbd_init_workqueue(&connection->sender_work);
2722 mutex_init(&connection->data.mutex);
2723 mutex_init(&connection->meta.mutex);
2725 drbd_thread_init(resource, &connection->receiver, drbd_receiver, "receiver");
2726 connection->receiver.connection = connection;
2727 drbd_thread_init(resource, &connection->worker, drbd_worker, "worker");
2728 connection->worker.connection = connection;
2729 drbd_thread_init(resource, &connection->ack_receiver, drbd_ack_receiver, "ack_recv");
2730 connection->ack_receiver.connection = connection;
2732 kref_init(&connection->kref);
2734 connection->resource = resource;
2736 if (set_resource_options(resource, res_opts))
2739 kref_get(&resource->kref);
2740 list_add_tail_rcu(&connection->connections, &resource->connections);
2741 drbd_debugfs_connection_add(connection);
2745 list_del(&resource->resources);
2746 drbd_free_resource(resource);
2748 kfree(connection->current_epoch);
2749 drbd_free_socket(&connection->meta);
2750 drbd_free_socket(&connection->data);
2755 void drbd_destroy_connection(struct kref *kref)
2757 struct drbd_connection *connection = container_of(kref, struct drbd_connection, kref);
2758 struct drbd_resource *resource = connection->resource;
2760 if (atomic_read(&connection->current_epoch->epoch_size) != 0)
2761 drbd_err(connection, "epoch_size:%d\n", atomic_read(&connection->current_epoch->epoch_size));
2762 kfree(connection->current_epoch);
2764 idr_destroy(&connection->peer_devices);
2766 drbd_free_socket(&connection->meta);
2767 drbd_free_socket(&connection->data);
2768 kfree(connection->int_dig_in);
2769 kfree(connection->int_dig_vv);
2770 memset(connection, 0xfc, sizeof(*connection));
2772 kref_put(&resource->kref, drbd_destroy_resource);
2775 static int init_submitter(struct drbd_device *device)
2777 /* opencoded create_singlethread_workqueue(),
2778 * to be able to say "drbd%d", ..., minor */
2780 alloc_ordered_workqueue("drbd%u_submit", WQ_MEM_RECLAIM, device->minor);
2781 if (!device->submit.wq)
2784 INIT_WORK(&device->submit.worker, do_submit);
2785 INIT_LIST_HEAD(&device->submit.writes);
2789 enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsigned int minor)
2791 struct drbd_resource *resource = adm_ctx->resource;
2792 struct drbd_connection *connection;
2793 struct drbd_device *device;
2794 struct drbd_peer_device *peer_device, *tmp_peer_device;
2795 struct gendisk *disk;
2796 struct request_queue *q;
2798 int vnr = adm_ctx->volume;
2799 enum drbd_ret_code err = ERR_NOMEM;
2801 device = minor_to_device(minor);
2803 return ERR_MINOR_OR_VOLUME_EXISTS;
2805 /* GFP_KERNEL, we are outside of all write-out paths */
2806 device = kzalloc(sizeof(struct drbd_device), GFP_KERNEL);
2809 kref_init(&device->kref);
2811 kref_get(&resource->kref);
2812 device->resource = resource;
2813 device->minor = minor;
2816 drbd_init_set_defaults(device);
2818 q = blk_alloc_queue(GFP_KERNEL);
2821 device->rq_queue = q;
2822 q->queuedata = device;
2824 disk = alloc_disk(1);
2827 device->vdisk = disk;
2829 set_disk_ro(disk, true);
2832 disk->major = DRBD_MAJOR;
2833 disk->first_minor = minor;
2834 disk->fops = &drbd_ops;
2835 sprintf(disk->disk_name, "drbd%d", minor);
2836 disk->private_data = device;
2838 device->this_bdev = bdget(MKDEV(DRBD_MAJOR, minor));
2839 /* we have no partitions. we contain only ourselves. */
2840 device->this_bdev->bd_contains = device->this_bdev;
2842 q->backing_dev_info->congested_fn = drbd_congested;
2843 q->backing_dev_info->congested_data = device;
2845 blk_queue_make_request(q, drbd_make_request);
2846 blk_queue_write_cache(q, true, true);
2847 /* Setting the max_hw_sectors to an odd value of 8kibyte here
2848 This triggers a max_bio_size message upon first attach or connect */
2849 blk_queue_max_hw_sectors(q, DRBD_MAX_BIO_SIZE_SAFE >> 8);
2850 q->queue_lock = &resource->req_lock;
2852 device->md_io.page = alloc_page(GFP_KERNEL);
2853 if (!device->md_io.page)
2854 goto out_no_io_page;
2856 if (drbd_bm_init(device))
2858 device->read_requests = RB_ROOT;
2859 device->write_requests = RB_ROOT;
2861 id = idr_alloc(&drbd_devices, device, minor, minor + 1, GFP_KERNEL);
2864 err = ERR_MINOR_OR_VOLUME_EXISTS;
2865 goto out_no_minor_idr;
2867 kref_get(&device->kref);
2869 id = idr_alloc(&resource->devices, device, vnr, vnr + 1, GFP_KERNEL);
2872 err = ERR_MINOR_OR_VOLUME_EXISTS;
2873 goto out_idr_remove_minor;
2875 kref_get(&device->kref);
2877 INIT_LIST_HEAD(&device->peer_devices);
2878 INIT_LIST_HEAD(&device->pending_bitmap_io);
2879 for_each_connection(connection, resource) {
2880 peer_device = kzalloc(sizeof(struct drbd_peer_device), GFP_KERNEL);
2882 goto out_idr_remove_from_resource;
2883 peer_device->connection = connection;
2884 peer_device->device = device;
2886 list_add(&peer_device->peer_devices, &device->peer_devices);
2887 kref_get(&device->kref);
2889 id = idr_alloc(&connection->peer_devices, peer_device, vnr, vnr + 1, GFP_KERNEL);
2892 err = ERR_INVALID_REQUEST;
2893 goto out_idr_remove_from_resource;
2895 kref_get(&connection->kref);
2896 INIT_WORK(&peer_device->send_acks_work, drbd_send_acks_wf);
2899 if (init_submitter(device)) {
2901 goto out_idr_remove_vol;
2906 /* inherit the connection state */
2907 device->state.conn = first_connection(resource)->cstate;
2908 if (device->state.conn == C_WF_REPORT_PARAMS) {
2909 for_each_peer_device(peer_device, device)
2910 drbd_connected(peer_device);
2912 /* move to create_peer_device() */
2913 for_each_peer_device(peer_device, device)
2914 drbd_debugfs_peer_device_add(peer_device);
2915 drbd_debugfs_device_add(device);
2919 idr_remove(&connection->peer_devices, vnr);
2920 out_idr_remove_from_resource:
2921 for_each_connection(connection, resource) {
2922 peer_device = idr_remove(&connection->peer_devices, vnr);
2924 kref_put(&connection->kref, drbd_destroy_connection);
2926 for_each_peer_device_safe(peer_device, tmp_peer_device, device) {
2927 list_del(&peer_device->peer_devices);
2930 idr_remove(&resource->devices, vnr);
2931 out_idr_remove_minor:
2932 idr_remove(&drbd_devices, minor);
2935 drbd_bm_cleanup(device);
2937 __free_page(device->md_io.page);
2941 blk_cleanup_queue(q);
2943 kref_put(&resource->kref, drbd_destroy_resource);
2948 void drbd_delete_device(struct drbd_device *device)
2950 struct drbd_resource *resource = device->resource;
2951 struct drbd_connection *connection;
2952 struct drbd_peer_device *peer_device;
2954 /* move to free_peer_device() */
2955 for_each_peer_device(peer_device, device)
2956 drbd_debugfs_peer_device_cleanup(peer_device);
2957 drbd_debugfs_device_cleanup(device);
2958 for_each_connection(connection, resource) {
2959 idr_remove(&connection->peer_devices, device->vnr);
2960 kref_put(&device->kref, drbd_destroy_device);
2962 idr_remove(&resource->devices, device->vnr);
2963 kref_put(&device->kref, drbd_destroy_device);
2964 idr_remove(&drbd_devices, device_to_minor(device));
2965 kref_put(&device->kref, drbd_destroy_device);
2966 del_gendisk(device->vdisk);
2968 kref_put(&device->kref, drbd_destroy_device);
2971 static int __init drbd_init(void)
2975 if (minor_count < DRBD_MINOR_COUNT_MIN || minor_count > DRBD_MINOR_COUNT_MAX) {
2976 pr_err("invalid minor_count (%d)\n", minor_count);
2980 minor_count = DRBD_MINOR_COUNT_DEF;
2984 err = register_blkdev(DRBD_MAJOR, "drbd");
2986 pr_err("unable to register block device major %d\n",
2992 * allocate all necessary structs
2994 init_waitqueue_head(&drbd_pp_wait);
2996 drbd_proc = NULL; /* play safe for drbd_cleanup */
2997 idr_init(&drbd_devices);
2999 mutex_init(&resources_mutex);
3000 INIT_LIST_HEAD(&drbd_resources);
3002 err = drbd_genl_register();
3004 pr_err("unable to register generic netlink family\n");
3008 err = drbd_create_mempools();
3013 drbd_proc = proc_create_data("drbd", S_IFREG | S_IRUGO , NULL, &drbd_proc_fops, NULL);
3015 pr_err("unable to register proc file\n");
3019 retry.wq = create_singlethread_workqueue("drbd-reissue");
3021 pr_err("unable to create retry workqueue\n");
3024 INIT_WORK(&retry.worker, do_retry);
3025 spin_lock_init(&retry.lock);
3026 INIT_LIST_HEAD(&retry.writes);
3028 if (drbd_debugfs_init())
3029 pr_notice("failed to initialize debugfs -- will not be available\n");
3031 pr_info("initialized. "
3032 "Version: " REL_VERSION " (api:%d/proto:%d-%d)\n",
3033 API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX);
3034 pr_info("%s\n", drbd_buildtag());
3035 pr_info("registered as block device major %d\n", DRBD_MAJOR);
3036 return 0; /* Success! */
3041 pr_err("ran out of memory\n");
3043 pr_err("initialization failure\n");
3047 static void drbd_free_one_sock(struct drbd_socket *ds)
3050 mutex_lock(&ds->mutex);
3053 mutex_unlock(&ds->mutex);
3055 /* so debugfs does not need to mutex_lock() */
3057 kernel_sock_shutdown(s, SHUT_RDWR);
3062 void drbd_free_sock(struct drbd_connection *connection)
3064 if (connection->data.socket)
3065 drbd_free_one_sock(&connection->data);
3066 if (connection->meta.socket)
3067 drbd_free_one_sock(&connection->meta);
3070 /* meta data management */
3072 void conn_md_sync(struct drbd_connection *connection)
3074 struct drbd_peer_device *peer_device;
3078 idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
3079 struct drbd_device *device = peer_device->device;
3081 kref_get(&device->kref);
3083 drbd_md_sync(device);
3084 kref_put(&device->kref, drbd_destroy_device);
3090 /* aligned 4kByte */
3091 struct meta_data_on_disk {
3092 u64 la_size_sect; /* last agreed size. */
3093 u64 uuid[UI_SIZE]; /* UUIDs. */
3096 u32 flags; /* MDF */
3099 u32 al_offset; /* offset to this block */
3100 u32 al_nr_extents; /* important for restoring the AL (userspace) */
3101 /* `-- act_log->nr_elements <-- ldev->dc.al_extents */
3102 u32 bm_offset; /* offset to the bitmap, from here */
3103 u32 bm_bytes_per_bit; /* BM_BLOCK_SIZE */
3104 u32 la_peer_max_bio_size; /* last peer max_bio_size */
3106 /* see al_tr_number_to_on_disk_sector() */
3108 u32 al_stripe_size_4k;
3110 u8 reserved_u8[4096 - (7*8 + 10*4)];
3115 void drbd_md_write(struct drbd_device *device, void *b)
3117 struct meta_data_on_disk *buffer = b;
3121 memset(buffer, 0, sizeof(*buffer));
3123 buffer->la_size_sect = cpu_to_be64(drbd_get_capacity(device->this_bdev));
3124 for (i = UI_CURRENT; i < UI_SIZE; i++)
3125 buffer->uuid[i] = cpu_to_be64(device->ldev->md.uuid[i]);
3126 buffer->flags = cpu_to_be32(device->ldev->md.flags);
3127 buffer->magic = cpu_to_be32(DRBD_MD_MAGIC_84_UNCLEAN);
3129 buffer->md_size_sect = cpu_to_be32(device->ldev->md.md_size_sect);
3130 buffer->al_offset = cpu_to_be32(device->ldev->md.al_offset);
3131 buffer->al_nr_extents = cpu_to_be32(device->act_log->nr_elements);
3132 buffer->bm_bytes_per_bit = cpu_to_be32(BM_BLOCK_SIZE);
3133 buffer->device_uuid = cpu_to_be64(device->ldev->md.device_uuid);
3135 buffer->bm_offset = cpu_to_be32(device->ldev->md.bm_offset);
3136 buffer->la_peer_max_bio_size = cpu_to_be32(device->peer_max_bio_size);
3138 buffer->al_stripes = cpu_to_be32(device->ldev->md.al_stripes);
3139 buffer->al_stripe_size_4k = cpu_to_be32(device->ldev->md.al_stripe_size_4k);
3141 D_ASSERT(device, drbd_md_ss(device->ldev) == device->ldev->md.md_offset);
3142 sector = device->ldev->md.md_offset;
3144 if (drbd_md_sync_page_io(device, device->ldev, sector, REQ_OP_WRITE)) {
3145 /* this was a try anyways ... */
3146 drbd_err(device, "meta data update failed!\n");
3147 drbd_chk_io_error(device, 1, DRBD_META_IO_ERROR);
3152 * drbd_md_sync() - Writes the meta data super block if the MD_DIRTY flag bit is set
3153 * @device: DRBD device.
3155 void drbd_md_sync(struct drbd_device *device)
3157 struct meta_data_on_disk *buffer;
3159 /* Don't accidentally change the DRBD meta data layout. */
3160 BUILD_BUG_ON(UI_SIZE != 4);
3161 BUILD_BUG_ON(sizeof(struct meta_data_on_disk) != 4096);
3163 del_timer(&device->md_sync_timer);
3164 /* timer may be rearmed by drbd_md_mark_dirty() now. */
3165 if (!test_and_clear_bit(MD_DIRTY, &device->flags))
3168 /* We use here D_FAILED and not D_ATTACHING because we try to write
3169 * metadata even if we detach due to a disk failure! */
3170 if (!get_ldev_if_state(device, D_FAILED))
3173 buffer = drbd_md_get_buffer(device, __func__);
3177 drbd_md_write(device, buffer);
3179 /* Update device->ldev->md.la_size_sect,
3180 * since we updated it on metadata. */
3181 device->ldev->md.la_size_sect = drbd_get_capacity(device->this_bdev);
3183 drbd_md_put_buffer(device);
3188 static int check_activity_log_stripe_size(struct drbd_device *device,
3189 struct meta_data_on_disk *on_disk,
3190 struct drbd_md *in_core)
3192 u32 al_stripes = be32_to_cpu(on_disk->al_stripes);
3193 u32 al_stripe_size_4k = be32_to_cpu(on_disk->al_stripe_size_4k);
3196 /* both not set: default to old fixed size activity log */
3197 if (al_stripes == 0 && al_stripe_size_4k == 0) {
3199 al_stripe_size_4k = MD_32kB_SECT/8;
3202 /* some paranoia plausibility checks */
3204 /* we need both values to be set */
3205 if (al_stripes == 0 || al_stripe_size_4k == 0)
3208 al_size_4k = (u64)al_stripes * al_stripe_size_4k;
3210 /* Upper limit of activity log area, to avoid potential overflow
3211 * problems in al_tr_number_to_on_disk_sector(). As right now, more
3212 * than 72 * 4k blocks total only increases the amount of history,
3213 * limiting this arbitrarily to 16 GB is not a real limitation ;-) */
3214 if (al_size_4k > (16 * 1024 * 1024/4))
3217 /* Lower limit: we need at least 8 transaction slots (32kB)
3218 * to not break existing setups */
3219 if (al_size_4k < MD_32kB_SECT/8)
3222 in_core->al_stripe_size_4k = al_stripe_size_4k;
3223 in_core->al_stripes = al_stripes;
3224 in_core->al_size_4k = al_size_4k;
3228 drbd_err(device, "invalid activity log striping: al_stripes=%u, al_stripe_size_4k=%u\n",
3229 al_stripes, al_stripe_size_4k);
3233 static int check_offsets_and_sizes(struct drbd_device *device, struct drbd_backing_dev *bdev)
3235 sector_t capacity = drbd_get_capacity(bdev->md_bdev);
3236 struct drbd_md *in_core = &bdev->md;
3237 s32 on_disk_al_sect;
3238 s32 on_disk_bm_sect;
3240 /* The on-disk size of the activity log, calculated from offsets, and
3241 * the size of the activity log calculated from the stripe settings,
3243 * Though we could relax this a bit: it is ok, if the striped activity log
3244 * fits in the available on-disk activity log size.
3245 * Right now, that would break how resize is implemented.
3246 * TODO: make drbd_determine_dev_size() (and the drbdmeta tool) aware
3247 * of possible unused padding space in the on disk layout. */
3248 if (in_core->al_offset < 0) {
3249 if (in_core->bm_offset > in_core->al_offset)
3251 on_disk_al_sect = -in_core->al_offset;
3252 on_disk_bm_sect = in_core->al_offset - in_core->bm_offset;
3254 if (in_core->al_offset != MD_4kB_SECT)
3256 if (in_core->bm_offset < in_core->al_offset + in_core->al_size_4k * MD_4kB_SECT)
3259 on_disk_al_sect = in_core->bm_offset - MD_4kB_SECT;
3260 on_disk_bm_sect = in_core->md_size_sect - in_core->bm_offset;
3263 /* old fixed size meta data is exactly that: fixed. */
3264 if (in_core->meta_dev_idx >= 0) {
3265 if (in_core->md_size_sect != MD_128MB_SECT
3266 || in_core->al_offset != MD_4kB_SECT
3267 || in_core->bm_offset != MD_4kB_SECT + MD_32kB_SECT
3268 || in_core->al_stripes != 1
3269 || in_core->al_stripe_size_4k != MD_32kB_SECT/8)
3273 if (capacity < in_core->md_size_sect)
3275 if (capacity - in_core->md_size_sect < drbd_md_first_sector(bdev))
3278 /* should be aligned, and at least 32k */
3279 if ((on_disk_al_sect & 7) || (on_disk_al_sect < MD_32kB_SECT))
3282 /* should fit (for now: exactly) into the available on-disk space;
3283 * overflow prevention is in check_activity_log_stripe_size() above. */
3284 if (on_disk_al_sect != in_core->al_size_4k * MD_4kB_SECT)
3287 /* again, should be aligned */
3288 if (in_core->bm_offset & 7)
3291 /* FIXME check for device grow with flex external meta data? */
3293 /* can the available bitmap space cover the last agreed device size? */
3294 if (on_disk_bm_sect < (in_core->la_size_sect+7)/MD_4kB_SECT/8/512)
3300 drbd_err(device, "meta data offsets don't make sense: idx=%d "
3301 "al_s=%u, al_sz4k=%u, al_offset=%d, bm_offset=%d, "
3302 "md_size_sect=%u, la_size=%llu, md_capacity=%llu\n",
3303 in_core->meta_dev_idx,
3304 in_core->al_stripes, in_core->al_stripe_size_4k,
3305 in_core->al_offset, in_core->bm_offset, in_core->md_size_sect,
3306 (unsigned long long)in_core->la_size_sect,
3307 (unsigned long long)capacity);
3314 * drbd_md_read() - Reads in the meta data super block
3315 * @device: DRBD device.
3316 * @bdev: Device from which the meta data should be read in.
3318 * Return NO_ERROR on success, and an enum drbd_ret_code in case
3319 * something goes wrong.
3321 * Called exactly once during drbd_adm_attach(), while still being D_DISKLESS,
3322 * even before @bdev is assigned to @device->ldev.
3324 int drbd_md_read(struct drbd_device *device, struct drbd_backing_dev *bdev)
3326 struct meta_data_on_disk *buffer;
3328 int i, rv = NO_ERROR;
3330 if (device->state.disk != D_DISKLESS)
3331 return ERR_DISK_CONFIGURED;
3333 buffer = drbd_md_get_buffer(device, __func__);
3337 /* First, figure out where our meta data superblock is located,
3339 bdev->md.meta_dev_idx = bdev->disk_conf->meta_dev_idx;
3340 bdev->md.md_offset = drbd_md_ss(bdev);
3341 /* Even for (flexible or indexed) external meta data,
3342 * initially restrict us to the 4k superblock for now.
3343 * Affects the paranoia out-of-range access check in drbd_md_sync_page_io(). */
3344 bdev->md.md_size_sect = 8;
3346 if (drbd_md_sync_page_io(device, bdev, bdev->md.md_offset,
3348 /* NOTE: can't do normal error processing here as this is
3349 called BEFORE disk is attached */
3350 drbd_err(device, "Error while reading metadata.\n");
3351 rv = ERR_IO_MD_DISK;
3355 magic = be32_to_cpu(buffer->magic);
3356 flags = be32_to_cpu(buffer->flags);
3357 if (magic == DRBD_MD_MAGIC_84_UNCLEAN ||
3358 (magic == DRBD_MD_MAGIC_08 && !(flags & MDF_AL_CLEAN))) {
3359 /* btw: that's Activity Log clean, not "all" clean. */
3360 drbd_err(device, "Found unclean meta data. Did you \"drbdadm apply-al\"?\n");
3361 rv = ERR_MD_UNCLEAN;
3365 rv = ERR_MD_INVALID;
3366 if (magic != DRBD_MD_MAGIC_08) {
3367 if (magic == DRBD_MD_MAGIC_07)
3368 drbd_err(device, "Found old (0.7) meta data magic. Did you \"drbdadm create-md\"?\n");
3370 drbd_err(device, "Meta data magic not found. Did you \"drbdadm create-md\"?\n");
3374 if (be32_to_cpu(buffer->bm_bytes_per_bit) != BM_BLOCK_SIZE) {
3375 drbd_err(device, "unexpected bm_bytes_per_bit: %u (expected %u)\n",
3376 be32_to_cpu(buffer->bm_bytes_per_bit), BM_BLOCK_SIZE);
3381 /* convert to in_core endian */
3382 bdev->md.la_size_sect = be64_to_cpu(buffer->la_size_sect);
3383 for (i = UI_CURRENT; i < UI_SIZE; i++)
3384 bdev->md.uuid[i] = be64_to_cpu(buffer->uuid[i]);
3385 bdev->md.flags = be32_to_cpu(buffer->flags);
3386 bdev->md.device_uuid = be64_to_cpu(buffer->device_uuid);
3388 bdev->md.md_size_sect = be32_to_cpu(buffer->md_size_sect);
3389 bdev->md.al_offset = be32_to_cpu(buffer->al_offset);
3390 bdev->md.bm_offset = be32_to_cpu(buffer->bm_offset);
3392 if (check_activity_log_stripe_size(device, buffer, &bdev->md))
3394 if (check_offsets_and_sizes(device, bdev))
3397 if (be32_to_cpu(buffer->bm_offset) != bdev->md.bm_offset) {
3398 drbd_err(device, "unexpected bm_offset: %d (expected %d)\n",
3399 be32_to_cpu(buffer->bm_offset), bdev->md.bm_offset);
3402 if (be32_to_cpu(buffer->md_size_sect) != bdev->md.md_size_sect) {
3403 drbd_err(device, "unexpected md_size: %u (expected %u)\n",
3404 be32_to_cpu(buffer->md_size_sect), bdev->md.md_size_sect);
3410 spin_lock_irq(&device->resource->req_lock);
3411 if (device->state.conn < C_CONNECTED) {
3413 peer = be32_to_cpu(buffer->la_peer_max_bio_size);
3414 peer = max(peer, DRBD_MAX_BIO_SIZE_SAFE);
3415 device->peer_max_bio_size = peer;
3417 spin_unlock_irq(&device->resource->req_lock);
3420 drbd_md_put_buffer(device);
3426 * drbd_md_mark_dirty() - Mark meta data super block as dirty
3427 * @device: DRBD device.
3429 * Call this function if you change anything that should be written to
3430 * the meta-data super block. This function sets MD_DIRTY, and starts a
3431 * timer that ensures that within five seconds you have to call drbd_md_sync().
3434 void drbd_md_mark_dirty_(struct drbd_device *device, unsigned int line, const char *func)
3436 if (!test_and_set_bit(MD_DIRTY, &device->flags)) {
3437 mod_timer(&device->md_sync_timer, jiffies + HZ);
3438 device->last_md_mark_dirty.line = line;
3439 device->last_md_mark_dirty.func = func;
3443 void drbd_md_mark_dirty(struct drbd_device *device)
3445 if (!test_and_set_bit(MD_DIRTY, &device->flags))
3446 mod_timer(&device->md_sync_timer, jiffies + 5*HZ);
3450 void drbd_uuid_move_history(struct drbd_device *device) __must_hold(local)
3454 for (i = UI_HISTORY_START; i < UI_HISTORY_END; i++)
3455 device->ldev->md.uuid[i+1] = device->ldev->md.uuid[i];
3458 void __drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local)
3460 if (idx == UI_CURRENT) {
3461 if (device->state.role == R_PRIMARY)
3466 drbd_set_ed_uuid(device, val);
3469 device->ldev->md.uuid[idx] = val;
3470 drbd_md_mark_dirty(device);
3473 void _drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local)
3475 unsigned long flags;
3476 spin_lock_irqsave(&device->ldev->md.uuid_lock, flags);
3477 __drbd_uuid_set(device, idx, val);
3478 spin_unlock_irqrestore(&device->ldev->md.uuid_lock, flags);
3481 void drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local)
3483 unsigned long flags;
3484 spin_lock_irqsave(&device->ldev->md.uuid_lock, flags);
3485 if (device->ldev->md.uuid[idx]) {
3486 drbd_uuid_move_history(device);
3487 device->ldev->md.uuid[UI_HISTORY_START] = device->ldev->md.uuid[idx];
3489 __drbd_uuid_set(device, idx, val);
3490 spin_unlock_irqrestore(&device->ldev->md.uuid_lock, flags);
3494 * drbd_uuid_new_current() - Creates a new current UUID
3495 * @device: DRBD device.
3497 * Creates a new current UUID, and rotates the old current UUID into
3498 * the bitmap slot. Causes an incremental resync upon next connect.
3500 void drbd_uuid_new_current(struct drbd_device *device) __must_hold(local)
3503 unsigned long long bm_uuid;
3505 get_random_bytes(&val, sizeof(u64));
3507 spin_lock_irq(&device->ldev->md.uuid_lock);
3508 bm_uuid = device->ldev->md.uuid[UI_BITMAP];
3511 drbd_warn(device, "bm UUID was already set: %llX\n", bm_uuid);
3513 device->ldev->md.uuid[UI_BITMAP] = device->ldev->md.uuid[UI_CURRENT];
3514 __drbd_uuid_set(device, UI_CURRENT, val);
3515 spin_unlock_irq(&device->ldev->md.uuid_lock);
3517 drbd_print_uuids(device, "new current UUID");
3518 /* get it to stable storage _now_ */
3519 drbd_md_sync(device);
3522 void drbd_uuid_set_bm(struct drbd_device *device, u64 val) __must_hold(local)
3524 unsigned long flags;
3525 if (device->ldev->md.uuid[UI_BITMAP] == 0 && val == 0)
3528 spin_lock_irqsave(&device->ldev->md.uuid_lock, flags);
3530 drbd_uuid_move_history(device);
3531 device->ldev->md.uuid[UI_HISTORY_START] = device->ldev->md.uuid[UI_BITMAP];
3532 device->ldev->md.uuid[UI_BITMAP] = 0;
3534 unsigned long long bm_uuid = device->ldev->md.uuid[UI_BITMAP];
3536 drbd_warn(device, "bm UUID was already set: %llX\n", bm_uuid);
3538 device->ldev->md.uuid[UI_BITMAP] = val & ~((u64)1);
3540 spin_unlock_irqrestore(&device->ldev->md.uuid_lock, flags);
3542 drbd_md_mark_dirty(device);
3546 * drbd_bmio_set_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
3547 * @device: DRBD device.
3549 * Sets all bits in the bitmap and writes the whole bitmap to stable storage.
3551 int drbd_bmio_set_n_write(struct drbd_device *device) __must_hold(local)
3555 drbd_md_set_flag(device, MDF_FULL_SYNC);
3556 drbd_md_sync(device);
3557 drbd_bm_set_all(device);
3559 rv = drbd_bm_write(device);
3562 drbd_md_clear_flag(device, MDF_FULL_SYNC);
3563 drbd_md_sync(device);
3570 * drbd_bmio_clear_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
3571 * @device: DRBD device.
3573 * Clears all bits in the bitmap and writes the whole bitmap to stable storage.
3575 int drbd_bmio_clear_n_write(struct drbd_device *device) __must_hold(local)
3577 drbd_resume_al(device);
3578 drbd_bm_clear_all(device);
3579 return drbd_bm_write(device);
3582 static int w_bitmap_io(struct drbd_work *w, int unused)
3584 struct drbd_device *device =
3585 container_of(w, struct drbd_device, bm_io_work.w);
3586 struct bm_io_work *work = &device->bm_io_work;
3589 if (work->flags != BM_LOCKED_CHANGE_ALLOWED) {
3590 int cnt = atomic_read(&device->ap_bio_cnt);
3592 drbd_err(device, "FIXME: ap_bio_cnt %d, expected 0; queued for '%s'\n",
3596 if (get_ldev(device)) {
3597 drbd_bm_lock(device, work->why, work->flags);
3598 rv = work->io_fn(device);
3599 drbd_bm_unlock(device);
3603 clear_bit_unlock(BITMAP_IO, &device->flags);
3604 wake_up(&device->misc_wait);
3607 work->done(device, rv);
3609 clear_bit(BITMAP_IO_QUEUED, &device->flags);
3617 * drbd_queue_bitmap_io() - Queues an IO operation on the whole bitmap
3618 * @device: DRBD device.
3619 * @io_fn: IO callback to be called when bitmap IO is possible
3620 * @done: callback to be called after the bitmap IO was performed
3621 * @why: Descriptive text of the reason for doing the IO
3623 * While IO on the bitmap happens we freeze application IO thus we ensure
3624 * that drbd_set_out_of_sync() can not be called. This function MAY ONLY be
3625 * called from worker context. It MUST NOT be used while a previous such
3626 * work is still pending!
3628 * Its worker function encloses the call of io_fn() by get_ldev() and
3631 void drbd_queue_bitmap_io(struct drbd_device *device,
3632 int (*io_fn)(struct drbd_device *),
3633 void (*done)(struct drbd_device *, int),
3634 char *why, enum bm_flag flags)
3636 D_ASSERT(device, current == first_peer_device(device)->connection->worker.task);
3638 D_ASSERT(device, !test_bit(BITMAP_IO_QUEUED, &device->flags));
3639 D_ASSERT(device, !test_bit(BITMAP_IO, &device->flags));
3640 D_ASSERT(device, list_empty(&device->bm_io_work.w.list));
3641 if (device->bm_io_work.why)
3642 drbd_err(device, "FIXME going to queue '%s' but '%s' still pending?\n",
3643 why, device->bm_io_work.why);
3645 device->bm_io_work.io_fn = io_fn;
3646 device->bm_io_work.done = done;
3647 device->bm_io_work.why = why;
3648 device->bm_io_work.flags = flags;
3650 spin_lock_irq(&device->resource->req_lock);
3651 set_bit(BITMAP_IO, &device->flags);
3652 /* don't wait for pending application IO if the caller indicates that
3653 * application IO does not conflict anyways. */
3654 if (flags == BM_LOCKED_CHANGE_ALLOWED || atomic_read(&device->ap_bio_cnt) == 0) {
3655 if (!test_and_set_bit(BITMAP_IO_QUEUED, &device->flags))
3656 drbd_queue_work(&first_peer_device(device)->connection->sender_work,
3657 &device->bm_io_work.w);
3659 spin_unlock_irq(&device->resource->req_lock);
3663 * drbd_bitmap_io() - Does an IO operation on the whole bitmap
3664 * @device: DRBD device.
3665 * @io_fn: IO callback to be called when bitmap IO is possible
3666 * @why: Descriptive text of the reason for doing the IO
3668 * freezes application IO while that the actual IO operations runs. This
3669 * functions MAY NOT be called from worker context.
3671 int drbd_bitmap_io(struct drbd_device *device, int (*io_fn)(struct drbd_device *),
3672 char *why, enum bm_flag flags)
3674 /* Only suspend io, if some operation is supposed to be locked out */
3675 const bool do_suspend_io = flags & (BM_DONT_CLEAR|BM_DONT_SET|BM_DONT_TEST);
3678 D_ASSERT(device, current != first_peer_device(device)->connection->worker.task);
3681 drbd_suspend_io(device);
3683 drbd_bm_lock(device, why, flags);
3685 drbd_bm_unlock(device);
3688 drbd_resume_io(device);
3693 void drbd_md_set_flag(struct drbd_device *device, int flag) __must_hold(local)
3695 if ((device->ldev->md.flags & flag) != flag) {
3696 drbd_md_mark_dirty(device);
3697 device->ldev->md.flags |= flag;
3701 void drbd_md_clear_flag(struct drbd_device *device, int flag) __must_hold(local)
3703 if ((device->ldev->md.flags & flag) != 0) {
3704 drbd_md_mark_dirty(device);
3705 device->ldev->md.flags &= ~flag;
3708 int drbd_md_test_flag(struct drbd_backing_dev *bdev, int flag)
3710 return (bdev->md.flags & flag) != 0;
3713 static void md_sync_timer_fn(unsigned long data)
3715 struct drbd_device *device = (struct drbd_device *) data;
3716 drbd_device_post_work(device, MD_SYNC);
3719 const char *cmdname(enum drbd_packet cmd)
3721 /* THINK may need to become several global tables
3722 * when we want to support more than
3723 * one PRO_VERSION */
3724 static const char *cmdnames[] = {
3726 [P_WSAME] = "WriteSame",
3728 [P_DATA_REPLY] = "DataReply",
3729 [P_RS_DATA_REPLY] = "RSDataReply",
3730 [P_BARRIER] = "Barrier",
3731 [P_BITMAP] = "ReportBitMap",
3732 [P_BECOME_SYNC_TARGET] = "BecomeSyncTarget",
3733 [P_BECOME_SYNC_SOURCE] = "BecomeSyncSource",
3734 [P_UNPLUG_REMOTE] = "UnplugRemote",
3735 [P_DATA_REQUEST] = "DataRequest",
3736 [P_RS_DATA_REQUEST] = "RSDataRequest",
3737 [P_SYNC_PARAM] = "SyncParam",
3738 [P_SYNC_PARAM89] = "SyncParam89",
3739 [P_PROTOCOL] = "ReportProtocol",
3740 [P_UUIDS] = "ReportUUIDs",
3741 [P_SIZES] = "ReportSizes",
3742 [P_STATE] = "ReportState",
3743 [P_SYNC_UUID] = "ReportSyncUUID",
3744 [P_AUTH_CHALLENGE] = "AuthChallenge",
3745 [P_AUTH_RESPONSE] = "AuthResponse",
3747 [P_PING_ACK] = "PingAck",
3748 [P_RECV_ACK] = "RecvAck",
3749 [P_WRITE_ACK] = "WriteAck",
3750 [P_RS_WRITE_ACK] = "RSWriteAck",
3751 [P_SUPERSEDED] = "Superseded",
3752 [P_NEG_ACK] = "NegAck",
3753 [P_NEG_DREPLY] = "NegDReply",
3754 [P_NEG_RS_DREPLY] = "NegRSDReply",
3755 [P_BARRIER_ACK] = "BarrierAck",
3756 [P_STATE_CHG_REQ] = "StateChgRequest",
3757 [P_STATE_CHG_REPLY] = "StateChgReply",
3758 [P_OV_REQUEST] = "OVRequest",
3759 [P_OV_REPLY] = "OVReply",
3760 [P_OV_RESULT] = "OVResult",
3761 [P_CSUM_RS_REQUEST] = "CsumRSRequest",
3762 [P_RS_IS_IN_SYNC] = "CsumRSIsInSync",
3763 [P_COMPRESSED_BITMAP] = "CBitmap",
3764 [P_DELAY_PROBE] = "DelayProbe",
3765 [P_OUT_OF_SYNC] = "OutOfSync",
3766 [P_RETRY_WRITE] = "RetryWrite",
3767 [P_RS_CANCEL] = "RSCancel",
3768 [P_CONN_ST_CHG_REQ] = "conn_st_chg_req",
3769 [P_CONN_ST_CHG_REPLY] = "conn_st_chg_reply",
3770 [P_RETRY_WRITE] = "retry_write",
3771 [P_PROTOCOL_UPDATE] = "protocol_update",
3772 [P_RS_THIN_REQ] = "rs_thin_req",
3773 [P_RS_DEALLOCATED] = "rs_deallocated",
3775 /* enum drbd_packet, but not commands - obsoleted flags:
3781 /* too big for the array: 0xfffX */
3782 if (cmd == P_INITIAL_META)
3783 return "InitialMeta";
3784 if (cmd == P_INITIAL_DATA)
3785 return "InitialData";
3786 if (cmd == P_CONNECTION_FEATURES)
3787 return "ConnectionFeatures";
3788 if (cmd >= ARRAY_SIZE(cmdnames))
3790 return cmdnames[cmd];
3794 * drbd_wait_misc - wait for a request to make progress
3795 * @device: device associated with the request
3796 * @i: the struct drbd_interval embedded in struct drbd_request or
3797 * struct drbd_peer_request
3799 int drbd_wait_misc(struct drbd_device *device, struct drbd_interval *i)
3801 struct net_conf *nc;
3806 nc = rcu_dereference(first_peer_device(device)->connection->net_conf);
3811 timeout = nc->ko_count ? nc->timeout * HZ / 10 * nc->ko_count : MAX_SCHEDULE_TIMEOUT;
3814 /* Indicate to wake up device->misc_wait on progress. */
3816 prepare_to_wait(&device->misc_wait, &wait, TASK_INTERRUPTIBLE);
3817 spin_unlock_irq(&device->resource->req_lock);
3818 timeout = schedule_timeout(timeout);
3819 finish_wait(&device->misc_wait, &wait);
3820 spin_lock_irq(&device->resource->req_lock);
3821 if (!timeout || device->state.conn < C_CONNECTED)
3823 if (signal_pending(current))
3824 return -ERESTARTSYS;
3828 void lock_all_resources(void)
3830 struct drbd_resource *resource;
3831 int __maybe_unused i = 0;
3833 mutex_lock(&resources_mutex);
3834 local_irq_disable();
3835 for_each_resource(resource, &drbd_resources)
3836 spin_lock_nested(&resource->req_lock, i++);
3839 void unlock_all_resources(void)
3841 struct drbd_resource *resource;
3843 for_each_resource(resource, &drbd_resources)
3844 spin_unlock(&resource->req_lock);
3846 mutex_unlock(&resources_mutex);
3849 #ifdef CONFIG_DRBD_FAULT_INJECTION
3850 /* Fault insertion support including random number generator shamelessly
3851 * stolen from kernel/rcutorture.c */
3852 struct fault_random_state {
3853 unsigned long state;
3854 unsigned long count;
3857 #define FAULT_RANDOM_MULT 39916801 /* prime */
3858 #define FAULT_RANDOM_ADD 479001701 /* prime */
3859 #define FAULT_RANDOM_REFRESH 10000
3862 * Crude but fast random-number generator. Uses a linear congruential
3863 * generator, with occasional help from get_random_bytes().
3865 static unsigned long
3866 _drbd_fault_random(struct fault_random_state *rsp)
3870 if (!rsp->count--) {
3871 get_random_bytes(&refresh, sizeof(refresh));
3872 rsp->state += refresh;
3873 rsp->count = FAULT_RANDOM_REFRESH;
3875 rsp->state = rsp->state * FAULT_RANDOM_MULT + FAULT_RANDOM_ADD;
3876 return swahw32(rsp->state);
3880 _drbd_fault_str(unsigned int type) {
3881 static char *_faults[] = {
3882 [DRBD_FAULT_MD_WR] = "Meta-data write",
3883 [DRBD_FAULT_MD_RD] = "Meta-data read",
3884 [DRBD_FAULT_RS_WR] = "Resync write",
3885 [DRBD_FAULT_RS_RD] = "Resync read",
3886 [DRBD_FAULT_DT_WR] = "Data write",
3887 [DRBD_FAULT_DT_RD] = "Data read",
3888 [DRBD_FAULT_DT_RA] = "Data read ahead",
3889 [DRBD_FAULT_BM_ALLOC] = "BM allocation",
3890 [DRBD_FAULT_AL_EE] = "EE allocation",
3891 [DRBD_FAULT_RECEIVE] = "receive data corruption",
3894 return (type < DRBD_FAULT_MAX) ? _faults[type] : "**Unknown**";
3898 _drbd_insert_fault(struct drbd_device *device, unsigned int type)
3900 static struct fault_random_state rrs = {0, 0};
3902 unsigned int ret = (
3904 ((1 << device_to_minor(device)) & fault_devs) != 0) &&
3905 (((_drbd_fault_random(&rrs) % 100) + 1) <= fault_rate));
3910 if (__ratelimit(&drbd_ratelimit_state))
3911 drbd_warn(device, "***Simulating %s failure\n",
3912 _drbd_fault_str(type));
3919 const char *drbd_buildtag(void)
3921 /* DRBD built from external sources has here a reference to the
3922 git hash of the source code. */
3924 static char buildtag[38] = "\0uilt-in";
3926 if (buildtag[0] == 0) {
3928 sprintf(buildtag, "srcversion: %-24s", THIS_MODULE->srcversion);
3937 module_init(drbd_init)
3938 module_exit(drbd_cleanup)
3940 EXPORT_SYMBOL(drbd_conn_str);
3941 EXPORT_SYMBOL(drbd_role_str);
3942 EXPORT_SYMBOL(drbd_disk_str);
3943 EXPORT_SYMBOL(drbd_set_st_err_str);