1 // SPDX-License-Identifier: GPL-2.0-or-later
5 This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
7 Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
8 Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
9 Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
11 Thanks to Carter Burden, Bart Grantham and Gennadiy Nerubayev
12 from Logicworks, Inc. for making SDP replication support possible.
17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19 #include <linux/module.h>
20 #include <linux/jiffies.h>
21 #include <linux/drbd.h>
22 #include <linux/uaccess.h>
23 #include <asm/types.h>
25 #include <linux/ctype.h>
26 #include <linux/mutex.h>
28 #include <linux/file.h>
29 #include <linux/proc_fs.h>
30 #include <linux/init.h>
32 #include <linux/memcontrol.h>
33 #include <linux/mm_inline.h>
34 #include <linux/slab.h>
35 #include <linux/random.h>
36 #include <linux/reboot.h>
37 #include <linux/notifier.h>
38 #include <linux/kthread.h>
39 #include <linux/workqueue.h>
40 #define __KERNEL_SYSCALLS__
41 #include <linux/unistd.h>
42 #include <linux/vmalloc.h>
43 #include <linux/sched/signal.h>
45 #include <linux/drbd_limits.h>
47 #include "drbd_protocol.h"
48 #include "drbd_req.h" /* only for _req_mod in tl_release and tl_clear */
50 #include "drbd_debugfs.h"
52 static DEFINE_MUTEX(drbd_main_mutex);
53 static int drbd_open(struct block_device *bdev, fmode_t mode);
54 static void drbd_release(struct gendisk *gd, fmode_t mode);
55 static void md_sync_timer_fn(struct timer_list *t);
56 static int w_bitmap_io(struct drbd_work *w, int unused);
58 MODULE_AUTHOR("Philipp Reisner <phil@linbit.com>, "
59 "Lars Ellenberg <lars@linbit.com>");
60 MODULE_DESCRIPTION("drbd - Distributed Replicated Block Device v" REL_VERSION);
61 MODULE_VERSION(REL_VERSION);
62 MODULE_LICENSE("GPL");
63 MODULE_PARM_DESC(minor_count, "Approximate number of drbd devices ("
64 __stringify(DRBD_MINOR_COUNT_MIN) "-" __stringify(DRBD_MINOR_COUNT_MAX) ")");
65 MODULE_ALIAS_BLOCKDEV_MAJOR(DRBD_MAJOR);
67 #include <linux/moduleparam.h>
68 /* thanks to these macros, if compiled into the kernel (not-module),
69 * these become boot parameters (e.g., drbd.minor_count) */
71 #ifdef CONFIG_DRBD_FAULT_INJECTION
72 int drbd_enable_faults;
74 static int drbd_fault_count;
75 static int drbd_fault_devs;
76 /* bitmap of enabled faults */
77 module_param_named(enable_faults, drbd_enable_faults, int, 0664);
78 /* fault rate % value - applies to all enabled faults */
79 module_param_named(fault_rate, drbd_fault_rate, int, 0664);
80 /* count of faults inserted */
81 module_param_named(fault_count, drbd_fault_count, int, 0664);
82 /* bitmap of devices to insert faults on */
83 module_param_named(fault_devs, drbd_fault_devs, int, 0644);
86 /* module parameters we can keep static */
87 static bool drbd_allow_oos; /* allow_open_on_secondary */
88 static bool drbd_disable_sendpage;
89 MODULE_PARM_DESC(allow_oos, "DONT USE!");
90 module_param_named(allow_oos, drbd_allow_oos, bool, 0);
91 module_param_named(disable_sendpage, drbd_disable_sendpage, bool, 0644);
93 /* module parameters we share */
94 int drbd_proc_details; /* Detail level in proc drbd*/
95 module_param_named(proc_details, drbd_proc_details, int, 0644);
96 /* module parameters shared with defaults */
97 unsigned int drbd_minor_count = DRBD_MINOR_COUNT_DEF;
98 /* Module parameter for setting the user mode helper program
99 * to run. Default is /sbin/drbdadm */
100 char drbd_usermode_helper[80] = "/sbin/drbdadm";
101 module_param_named(minor_count, drbd_minor_count, uint, 0444);
102 module_param_string(usermode_helper, drbd_usermode_helper, sizeof(drbd_usermode_helper), 0644);
104 /* in 2.6.x, our device mapping and config info contains our virtual gendisks
105 * as member "struct gendisk *vdisk;"
107 struct idr drbd_devices;
108 struct list_head drbd_resources;
109 struct mutex resources_mutex;
111 struct kmem_cache *drbd_request_cache;
112 struct kmem_cache *drbd_ee_cache; /* peer requests */
113 struct kmem_cache *drbd_bm_ext_cache; /* bitmap extents */
114 struct kmem_cache *drbd_al_ext_cache; /* activity log extents */
115 mempool_t drbd_request_mempool;
116 mempool_t drbd_ee_mempool;
117 mempool_t drbd_md_io_page_pool;
118 struct bio_set drbd_md_io_bio_set;
119 struct bio_set drbd_io_bio_set;
121 /* I do not use a standard mempool, because:
122 1) I want to hand out the pre-allocated objects first.
123 2) I want to be able to interrupt sleeping allocation with a signal.
124 Note: This is a single linked list, the next pointer is the private
125 member of struct page.
127 struct page *drbd_pp_pool;
128 spinlock_t drbd_pp_lock;
130 wait_queue_head_t drbd_pp_wait;
132 DEFINE_RATELIMIT_STATE(drbd_ratelimit_state, 5 * HZ, 5);
134 static const struct block_device_operations drbd_ops = {
135 .owner = THIS_MODULE,
137 .release = drbd_release,
140 struct bio *bio_alloc_drbd(gfp_t gfp_mask)
144 if (!bioset_initialized(&drbd_md_io_bio_set))
145 return bio_alloc(gfp_mask, 1);
147 bio = bio_alloc_bioset(gfp_mask, 1, &drbd_md_io_bio_set);
154 /* When checking with sparse, and this is an inline function, sparse will
155 give tons of false positives. When this is a real functions sparse works.
157 int _get_ldev_if_state(struct drbd_device *device, enum drbd_disk_state mins)
161 atomic_inc(&device->local_cnt);
162 io_allowed = (device->state.disk >= mins);
164 if (atomic_dec_and_test(&device->local_cnt))
165 wake_up(&device->misc_wait);
173 * tl_release() - mark as BARRIER_ACKED all requests in the corresponding transfer log epoch
174 * @connection: DRBD connection.
175 * @barrier_nr: Expected identifier of the DRBD write barrier packet.
176 * @set_size: Expected number of requests before that barrier.
178 * In case the passed barrier_nr or set_size does not match the oldest
179 * epoch of not yet barrier-acked requests, this function will cause a
180 * termination of the connection.
182 void tl_release(struct drbd_connection *connection, unsigned int barrier_nr,
183 unsigned int set_size)
185 struct drbd_request *r;
186 struct drbd_request *req = NULL;
187 int expect_epoch = 0;
190 spin_lock_irq(&connection->resource->req_lock);
192 /* find oldest not yet barrier-acked write request,
193 * count writes in its epoch. */
194 list_for_each_entry(r, &connection->transfer_log, tl_requests) {
195 const unsigned s = r->rq_state;
199 if (!(s & RQ_NET_MASK))
204 expect_epoch = req->epoch;
207 if (r->epoch != expect_epoch)
211 /* if (s & RQ_DONE): not expected */
212 /* if (!(s & RQ_NET_MASK)): not expected */
217 /* first some paranoia code */
219 drbd_err(connection, "BAD! BarrierAck #%u received, but no epoch in tl!?\n",
223 if (expect_epoch != barrier_nr) {
224 drbd_err(connection, "BAD! BarrierAck #%u received, expected #%u!\n",
225 barrier_nr, expect_epoch);
229 if (expect_size != set_size) {
230 drbd_err(connection, "BAD! BarrierAck #%u received with n_writes=%u, expected n_writes=%u!\n",
231 barrier_nr, set_size, expect_size);
235 /* Clean up list of requests processed during current epoch. */
236 /* this extra list walk restart is paranoia,
237 * to catch requests being barrier-acked "unexpectedly".
238 * It usually should find the same req again, or some READ preceding it. */
239 list_for_each_entry(req, &connection->transfer_log, tl_requests)
240 if (req->epoch == expect_epoch)
242 list_for_each_entry_safe_from(req, r, &connection->transfer_log, tl_requests) {
243 if (req->epoch != expect_epoch)
245 _req_mod(req, BARRIER_ACKED);
247 spin_unlock_irq(&connection->resource->req_lock);
252 spin_unlock_irq(&connection->resource->req_lock);
253 conn_request_state(connection, NS(conn, C_PROTOCOL_ERROR), CS_HARD);
258 * _tl_restart() - Walks the transfer log, and applies an action to all requests
259 * @connection: DRBD connection to operate on.
260 * @what: The action/event to perform with all request objects
262 * @what might be one of CONNECTION_LOST_WHILE_PENDING, RESEND, FAIL_FROZEN_DISK_IO,
263 * RESTART_FROZEN_DISK_IO.
265 /* must hold resource->req_lock */
266 void _tl_restart(struct drbd_connection *connection, enum drbd_req_event what)
268 struct drbd_request *req, *r;
270 list_for_each_entry_safe(req, r, &connection->transfer_log, tl_requests)
274 void tl_restart(struct drbd_connection *connection, enum drbd_req_event what)
276 spin_lock_irq(&connection->resource->req_lock);
277 _tl_restart(connection, what);
278 spin_unlock_irq(&connection->resource->req_lock);
282 * tl_clear() - Clears all requests and &struct drbd_tl_epoch objects out of the TL
283 * @device: DRBD device.
285 * This is called after the connection to the peer was lost. The storage covered
286 * by the requests on the transfer gets marked as our of sync. Called from the
287 * receiver thread and the worker thread.
289 void tl_clear(struct drbd_connection *connection)
291 tl_restart(connection, CONNECTION_LOST_WHILE_PENDING);
295 * tl_abort_disk_io() - Abort disk I/O for all requests for a certain device in the TL
296 * @device: DRBD device.
298 void tl_abort_disk_io(struct drbd_device *device)
300 struct drbd_connection *connection = first_peer_device(device)->connection;
301 struct drbd_request *req, *r;
303 spin_lock_irq(&connection->resource->req_lock);
304 list_for_each_entry_safe(req, r, &connection->transfer_log, tl_requests) {
305 if (!(req->rq_state & RQ_LOCAL_PENDING))
307 if (req->device != device)
309 _req_mod(req, ABORT_DISK_IO);
311 spin_unlock_irq(&connection->resource->req_lock);
314 static int drbd_thread_setup(void *arg)
316 struct drbd_thread *thi = (struct drbd_thread *) arg;
317 struct drbd_resource *resource = thi->resource;
321 snprintf(current->comm, sizeof(current->comm), "drbd_%c_%s",
326 retval = thi->function(thi);
328 spin_lock_irqsave(&thi->t_lock, flags);
330 /* if the receiver has been "EXITING", the last thing it did
331 * was set the conn state to "StandAlone",
332 * if now a re-connect request comes in, conn state goes C_UNCONNECTED,
333 * and receiver thread will be "started".
334 * drbd_thread_start needs to set "RESTARTING" in that case.
335 * t_state check and assignment needs to be within the same spinlock,
336 * so either thread_start sees EXITING, and can remap to RESTARTING,
337 * or thread_start see NONE, and can proceed as normal.
340 if (thi->t_state == RESTARTING) {
341 drbd_info(resource, "Restarting %s thread\n", thi->name);
342 thi->t_state = RUNNING;
343 spin_unlock_irqrestore(&thi->t_lock, flags);
350 complete_all(&thi->stop);
351 spin_unlock_irqrestore(&thi->t_lock, flags);
353 drbd_info(resource, "Terminating %s\n", current->comm);
355 /* Release mod reference taken when thread was started */
358 kref_put(&thi->connection->kref, drbd_destroy_connection);
359 kref_put(&resource->kref, drbd_destroy_resource);
360 module_put(THIS_MODULE);
364 static void drbd_thread_init(struct drbd_resource *resource, struct drbd_thread *thi,
365 int (*func) (struct drbd_thread *), const char *name)
367 spin_lock_init(&thi->t_lock);
370 thi->function = func;
371 thi->resource = resource;
372 thi->connection = NULL;
376 int drbd_thread_start(struct drbd_thread *thi)
378 struct drbd_resource *resource = thi->resource;
379 struct task_struct *nt;
382 /* is used from state engine doing drbd_thread_stop_nowait,
383 * while holding the req lock irqsave */
384 spin_lock_irqsave(&thi->t_lock, flags);
386 switch (thi->t_state) {
388 drbd_info(resource, "Starting %s thread (from %s [%d])\n",
389 thi->name, current->comm, current->pid);
391 /* Get ref on module for thread - this is released when thread exits */
392 if (!try_module_get(THIS_MODULE)) {
393 drbd_err(resource, "Failed to get module reference in drbd_thread_start\n");
394 spin_unlock_irqrestore(&thi->t_lock, flags);
398 kref_get(&resource->kref);
400 kref_get(&thi->connection->kref);
402 init_completion(&thi->stop);
403 thi->reset_cpu_mask = 1;
404 thi->t_state = RUNNING;
405 spin_unlock_irqrestore(&thi->t_lock, flags);
406 flush_signals(current); /* otherw. may get -ERESTARTNOINTR */
408 nt = kthread_create(drbd_thread_setup, (void *) thi,
409 "drbd_%c_%s", thi->name[0], thi->resource->name);
412 drbd_err(resource, "Couldn't start thread\n");
415 kref_put(&thi->connection->kref, drbd_destroy_connection);
416 kref_put(&resource->kref, drbd_destroy_resource);
417 module_put(THIS_MODULE);
420 spin_lock_irqsave(&thi->t_lock, flags);
422 thi->t_state = RUNNING;
423 spin_unlock_irqrestore(&thi->t_lock, flags);
427 thi->t_state = RESTARTING;
428 drbd_info(resource, "Restarting %s thread (from %s [%d])\n",
429 thi->name, current->comm, current->pid);
434 spin_unlock_irqrestore(&thi->t_lock, flags);
442 void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait)
446 enum drbd_thread_state ns = restart ? RESTARTING : EXITING;
448 /* may be called from state engine, holding the req lock irqsave */
449 spin_lock_irqsave(&thi->t_lock, flags);
451 if (thi->t_state == NONE) {
452 spin_unlock_irqrestore(&thi->t_lock, flags);
454 drbd_thread_start(thi);
458 if (thi->t_state != ns) {
459 if (thi->task == NULL) {
460 spin_unlock_irqrestore(&thi->t_lock, flags);
466 init_completion(&thi->stop);
467 if (thi->task != current)
468 force_sig(DRBD_SIGKILL, thi->task);
471 spin_unlock_irqrestore(&thi->t_lock, flags);
474 wait_for_completion(&thi->stop);
477 int conn_lowest_minor(struct drbd_connection *connection)
479 struct drbd_peer_device *peer_device;
480 int vnr = 0, minor = -1;
483 peer_device = idr_get_next(&connection->peer_devices, &vnr);
485 minor = device_to_minor(peer_device->device);
493 * drbd_calc_cpu_mask() - Generate CPU masks, spread over all CPUs
495 * Forces all threads of a resource onto the same CPU. This is beneficial for
496 * DRBD's performance. May be overwritten by user's configuration.
498 static void drbd_calc_cpu_mask(cpumask_var_t *cpu_mask)
500 unsigned int *resources_per_cpu, min_index = ~0;
502 resources_per_cpu = kcalloc(nr_cpu_ids, sizeof(*resources_per_cpu),
504 if (resources_per_cpu) {
505 struct drbd_resource *resource;
506 unsigned int cpu, min = ~0;
509 for_each_resource_rcu(resource, &drbd_resources) {
510 for_each_cpu(cpu, resource->cpu_mask)
511 resources_per_cpu[cpu]++;
514 for_each_online_cpu(cpu) {
515 if (resources_per_cpu[cpu] < min) {
516 min = resources_per_cpu[cpu];
520 kfree(resources_per_cpu);
522 if (min_index == ~0) {
523 cpumask_setall(*cpu_mask);
526 cpumask_set_cpu(min_index, *cpu_mask);
530 * drbd_thread_current_set_cpu() - modifies the cpu mask of the _current_ thread
531 * @device: DRBD device.
532 * @thi: drbd_thread object
534 * call in the "main loop" of _all_ threads, no need for any mutex, current won't die
537 void drbd_thread_current_set_cpu(struct drbd_thread *thi)
539 struct drbd_resource *resource = thi->resource;
540 struct task_struct *p = current;
542 if (!thi->reset_cpu_mask)
544 thi->reset_cpu_mask = 0;
545 set_cpus_allowed_ptr(p, resource->cpu_mask);
548 #define drbd_calc_cpu_mask(A) ({})
552 * drbd_header_size - size of a packet header
554 * The header size is a multiple of 8, so any payload following the header is
555 * word aligned on 64-bit architectures. (The bitmap send and receive code
558 unsigned int drbd_header_size(struct drbd_connection *connection)
560 if (connection->agreed_pro_version >= 100) {
561 BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header100), 8));
562 return sizeof(struct p_header100);
564 BUILD_BUG_ON(sizeof(struct p_header80) !=
565 sizeof(struct p_header95));
566 BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header80), 8));
567 return sizeof(struct p_header80);
571 static unsigned int prepare_header80(struct p_header80 *h, enum drbd_packet cmd, int size)
573 h->magic = cpu_to_be32(DRBD_MAGIC);
574 h->command = cpu_to_be16(cmd);
575 h->length = cpu_to_be16(size);
576 return sizeof(struct p_header80);
579 static unsigned int prepare_header95(struct p_header95 *h, enum drbd_packet cmd, int size)
581 h->magic = cpu_to_be16(DRBD_MAGIC_BIG);
582 h->command = cpu_to_be16(cmd);
583 h->length = cpu_to_be32(size);
584 return sizeof(struct p_header95);
587 static unsigned int prepare_header100(struct p_header100 *h, enum drbd_packet cmd,
590 h->magic = cpu_to_be32(DRBD_MAGIC_100);
591 h->volume = cpu_to_be16(vnr);
592 h->command = cpu_to_be16(cmd);
593 h->length = cpu_to_be32(size);
595 return sizeof(struct p_header100);
598 static unsigned int prepare_header(struct drbd_connection *connection, int vnr,
599 void *buffer, enum drbd_packet cmd, int size)
601 if (connection->agreed_pro_version >= 100)
602 return prepare_header100(buffer, cmd, size, vnr);
603 else if (connection->agreed_pro_version >= 95 &&
604 size > DRBD_MAX_SIZE_H80_PACKET)
605 return prepare_header95(buffer, cmd, size);
607 return prepare_header80(buffer, cmd, size);
610 static void *__conn_prepare_command(struct drbd_connection *connection,
611 struct drbd_socket *sock)
615 return sock->sbuf + drbd_header_size(connection);
618 void *conn_prepare_command(struct drbd_connection *connection, struct drbd_socket *sock)
622 mutex_lock(&sock->mutex);
623 p = __conn_prepare_command(connection, sock);
625 mutex_unlock(&sock->mutex);
630 void *drbd_prepare_command(struct drbd_peer_device *peer_device, struct drbd_socket *sock)
632 return conn_prepare_command(peer_device->connection, sock);
635 static int __send_command(struct drbd_connection *connection, int vnr,
636 struct drbd_socket *sock, enum drbd_packet cmd,
637 unsigned int header_size, void *data,
644 * Called with @data == NULL and the size of the data blocks in @size
645 * for commands that send data blocks. For those commands, omit the
646 * MSG_MORE flag: this will increase the likelihood that data blocks
647 * which are page aligned on the sender will end up page aligned on the
650 msg_flags = data ? MSG_MORE : 0;
652 header_size += prepare_header(connection, vnr, sock->sbuf, cmd,
654 err = drbd_send_all(connection, sock->socket, sock->sbuf, header_size,
657 err = drbd_send_all(connection, sock->socket, data, size, 0);
658 /* DRBD protocol "pings" are latency critical.
659 * This is supposed to trigger tcp_push_pending_frames() */
660 if (!err && (cmd == P_PING || cmd == P_PING_ACK))
661 drbd_tcp_nodelay(sock->socket);
666 static int __conn_send_command(struct drbd_connection *connection, struct drbd_socket *sock,
667 enum drbd_packet cmd, unsigned int header_size,
668 void *data, unsigned int size)
670 return __send_command(connection, 0, sock, cmd, header_size, data, size);
673 int conn_send_command(struct drbd_connection *connection, struct drbd_socket *sock,
674 enum drbd_packet cmd, unsigned int header_size,
675 void *data, unsigned int size)
679 err = __conn_send_command(connection, sock, cmd, header_size, data, size);
680 mutex_unlock(&sock->mutex);
684 int drbd_send_command(struct drbd_peer_device *peer_device, struct drbd_socket *sock,
685 enum drbd_packet cmd, unsigned int header_size,
686 void *data, unsigned int size)
690 err = __send_command(peer_device->connection, peer_device->device->vnr,
691 sock, cmd, header_size, data, size);
692 mutex_unlock(&sock->mutex);
696 int drbd_send_ping(struct drbd_connection *connection)
698 struct drbd_socket *sock;
700 sock = &connection->meta;
701 if (!conn_prepare_command(connection, sock))
703 return conn_send_command(connection, sock, P_PING, 0, NULL, 0);
706 int drbd_send_ping_ack(struct drbd_connection *connection)
708 struct drbd_socket *sock;
710 sock = &connection->meta;
711 if (!conn_prepare_command(connection, sock))
713 return conn_send_command(connection, sock, P_PING_ACK, 0, NULL, 0);
716 int drbd_send_sync_param(struct drbd_peer_device *peer_device)
718 struct drbd_socket *sock;
719 struct p_rs_param_95 *p;
721 const int apv = peer_device->connection->agreed_pro_version;
722 enum drbd_packet cmd;
724 struct disk_conf *dc;
726 sock = &peer_device->connection->data;
727 p = drbd_prepare_command(peer_device, sock);
732 nc = rcu_dereference(peer_device->connection->net_conf);
734 size = apv <= 87 ? sizeof(struct p_rs_param)
735 : apv == 88 ? sizeof(struct p_rs_param)
736 + strlen(nc->verify_alg) + 1
737 : apv <= 94 ? sizeof(struct p_rs_param_89)
738 : /* apv >= 95 */ sizeof(struct p_rs_param_95);
740 cmd = apv >= 89 ? P_SYNC_PARAM89 : P_SYNC_PARAM;
742 /* initialize verify_alg and csums_alg */
743 memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX);
745 if (get_ldev(peer_device->device)) {
746 dc = rcu_dereference(peer_device->device->ldev->disk_conf);
747 p->resync_rate = cpu_to_be32(dc->resync_rate);
748 p->c_plan_ahead = cpu_to_be32(dc->c_plan_ahead);
749 p->c_delay_target = cpu_to_be32(dc->c_delay_target);
750 p->c_fill_target = cpu_to_be32(dc->c_fill_target);
751 p->c_max_rate = cpu_to_be32(dc->c_max_rate);
752 put_ldev(peer_device->device);
754 p->resync_rate = cpu_to_be32(DRBD_RESYNC_RATE_DEF);
755 p->c_plan_ahead = cpu_to_be32(DRBD_C_PLAN_AHEAD_DEF);
756 p->c_delay_target = cpu_to_be32(DRBD_C_DELAY_TARGET_DEF);
757 p->c_fill_target = cpu_to_be32(DRBD_C_FILL_TARGET_DEF);
758 p->c_max_rate = cpu_to_be32(DRBD_C_MAX_RATE_DEF);
762 strcpy(p->verify_alg, nc->verify_alg);
764 strcpy(p->csums_alg, nc->csums_alg);
767 return drbd_send_command(peer_device, sock, cmd, size, NULL, 0);
770 int __drbd_send_protocol(struct drbd_connection *connection, enum drbd_packet cmd)
772 struct drbd_socket *sock;
773 struct p_protocol *p;
777 sock = &connection->data;
778 p = __conn_prepare_command(connection, sock);
783 nc = rcu_dereference(connection->net_conf);
785 if (nc->tentative && connection->agreed_pro_version < 92) {
787 mutex_unlock(&sock->mutex);
788 drbd_err(connection, "--dry-run is not supported by peer");
793 if (connection->agreed_pro_version >= 87)
794 size += strlen(nc->integrity_alg) + 1;
796 p->protocol = cpu_to_be32(nc->wire_protocol);
797 p->after_sb_0p = cpu_to_be32(nc->after_sb_0p);
798 p->after_sb_1p = cpu_to_be32(nc->after_sb_1p);
799 p->after_sb_2p = cpu_to_be32(nc->after_sb_2p);
800 p->two_primaries = cpu_to_be32(nc->two_primaries);
802 if (nc->discard_my_data)
803 cf |= CF_DISCARD_MY_DATA;
806 p->conn_flags = cpu_to_be32(cf);
808 if (connection->agreed_pro_version >= 87)
809 strcpy(p->integrity_alg, nc->integrity_alg);
812 return __conn_send_command(connection, sock, cmd, size, NULL, 0);
815 int drbd_send_protocol(struct drbd_connection *connection)
819 mutex_lock(&connection->data.mutex);
820 err = __drbd_send_protocol(connection, P_PROTOCOL);
821 mutex_unlock(&connection->data.mutex);
826 static int _drbd_send_uuids(struct drbd_peer_device *peer_device, u64 uuid_flags)
828 struct drbd_device *device = peer_device->device;
829 struct drbd_socket *sock;
833 if (!get_ldev_if_state(device, D_NEGOTIATING))
836 sock = &peer_device->connection->data;
837 p = drbd_prepare_command(peer_device, sock);
842 spin_lock_irq(&device->ldev->md.uuid_lock);
843 for (i = UI_CURRENT; i < UI_SIZE; i++)
844 p->uuid[i] = cpu_to_be64(device->ldev->md.uuid[i]);
845 spin_unlock_irq(&device->ldev->md.uuid_lock);
847 device->comm_bm_set = drbd_bm_total_weight(device);
848 p->uuid[UI_SIZE] = cpu_to_be64(device->comm_bm_set);
850 uuid_flags |= rcu_dereference(peer_device->connection->net_conf)->discard_my_data ? 1 : 0;
852 uuid_flags |= test_bit(CRASHED_PRIMARY, &device->flags) ? 2 : 0;
853 uuid_flags |= device->new_state_tmp.disk == D_INCONSISTENT ? 4 : 0;
854 p->uuid[UI_FLAGS] = cpu_to_be64(uuid_flags);
857 return drbd_send_command(peer_device, sock, P_UUIDS, sizeof(*p), NULL, 0);
860 int drbd_send_uuids(struct drbd_peer_device *peer_device)
862 return _drbd_send_uuids(peer_device, 0);
865 int drbd_send_uuids_skip_initial_sync(struct drbd_peer_device *peer_device)
867 return _drbd_send_uuids(peer_device, 8);
870 void drbd_print_uuids(struct drbd_device *device, const char *text)
872 if (get_ldev_if_state(device, D_NEGOTIATING)) {
873 u64 *uuid = device->ldev->md.uuid;
874 drbd_info(device, "%s %016llX:%016llX:%016llX:%016llX\n",
876 (unsigned long long)uuid[UI_CURRENT],
877 (unsigned long long)uuid[UI_BITMAP],
878 (unsigned long long)uuid[UI_HISTORY_START],
879 (unsigned long long)uuid[UI_HISTORY_END]);
882 drbd_info(device, "%s effective data uuid: %016llX\n",
884 (unsigned long long)device->ed_uuid);
888 void drbd_gen_and_send_sync_uuid(struct drbd_peer_device *peer_device)
890 struct drbd_device *device = peer_device->device;
891 struct drbd_socket *sock;
895 D_ASSERT(device, device->state.disk == D_UP_TO_DATE);
897 uuid = device->ldev->md.uuid[UI_BITMAP];
898 if (uuid && uuid != UUID_JUST_CREATED)
899 uuid = uuid + UUID_NEW_BM_OFFSET;
901 get_random_bytes(&uuid, sizeof(u64));
902 drbd_uuid_set(device, UI_BITMAP, uuid);
903 drbd_print_uuids(device, "updated sync UUID");
904 drbd_md_sync(device);
906 sock = &peer_device->connection->data;
907 p = drbd_prepare_command(peer_device, sock);
909 p->uuid = cpu_to_be64(uuid);
910 drbd_send_command(peer_device, sock, P_SYNC_UUID, sizeof(*p), NULL, 0);
914 /* communicated if (agreed_features & DRBD_FF_WSAME) */
916 assign_p_sizes_qlim(struct drbd_device *device, struct p_sizes *p,
917 struct request_queue *q)
920 p->qlim->physical_block_size = cpu_to_be32(queue_physical_block_size(q));
921 p->qlim->logical_block_size = cpu_to_be32(queue_logical_block_size(q));
922 p->qlim->alignment_offset = cpu_to_be32(queue_alignment_offset(q));
923 p->qlim->io_min = cpu_to_be32(queue_io_min(q));
924 p->qlim->io_opt = cpu_to_be32(queue_io_opt(q));
925 p->qlim->discard_enabled = blk_queue_discard(q);
926 p->qlim->write_same_capable = !!q->limits.max_write_same_sectors;
928 q = device->rq_queue;
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 = 0;
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 = 0;
935 p->qlim->write_same_capable = 0;
939 int drbd_send_sizes(struct drbd_peer_device *peer_device, int trigger_reply, enum dds_flags flags)
941 struct drbd_device *device = peer_device->device;
942 struct drbd_socket *sock;
944 sector_t d_size, u_size;
946 unsigned int max_bio_size;
947 unsigned int packet_size;
949 sock = &peer_device->connection->data;
950 p = drbd_prepare_command(peer_device, sock);
954 packet_size = sizeof(*p);
955 if (peer_device->connection->agreed_features & DRBD_FF_WSAME)
956 packet_size += sizeof(p->qlim[0]);
958 memset(p, 0, packet_size);
959 if (get_ldev_if_state(device, D_NEGOTIATING)) {
960 struct request_queue *q = bdev_get_queue(device->ldev->backing_bdev);
961 d_size = drbd_get_max_capacity(device->ldev);
963 u_size = rcu_dereference(device->ldev->disk_conf)->disk_size;
965 q_order_type = drbd_queue_order_type(device);
966 max_bio_size = queue_max_hw_sectors(q) << 9;
967 max_bio_size = min(max_bio_size, DRBD_MAX_BIO_SIZE);
968 assign_p_sizes_qlim(device, p, q);
973 q_order_type = QUEUE_ORDERED_NONE;
974 max_bio_size = DRBD_MAX_BIO_SIZE; /* ... multiple BIOs per peer_request */
975 assign_p_sizes_qlim(device, p, NULL);
978 if (peer_device->connection->agreed_pro_version <= 94)
979 max_bio_size = min(max_bio_size, DRBD_MAX_SIZE_H80_PACKET);
980 else if (peer_device->connection->agreed_pro_version < 100)
981 max_bio_size = min(max_bio_size, DRBD_MAX_BIO_SIZE_P95);
983 p->d_size = cpu_to_be64(d_size);
984 p->u_size = cpu_to_be64(u_size);
985 p->c_size = cpu_to_be64(trigger_reply ? 0 : drbd_get_capacity(device->this_bdev));
986 p->max_bio_size = cpu_to_be32(max_bio_size);
987 p->queue_order_type = cpu_to_be16(q_order_type);
988 p->dds_flags = cpu_to_be16(flags);
990 return drbd_send_command(peer_device, sock, P_SIZES, packet_size, NULL, 0);
994 * drbd_send_current_state() - Sends the drbd state to the peer
995 * @peer_device: DRBD peer device.
997 int drbd_send_current_state(struct drbd_peer_device *peer_device)
999 struct drbd_socket *sock;
1002 sock = &peer_device->connection->data;
1003 p = drbd_prepare_command(peer_device, sock);
1006 p->state = cpu_to_be32(peer_device->device->state.i); /* Within the send mutex */
1007 return drbd_send_command(peer_device, sock, P_STATE, sizeof(*p), NULL, 0);
1011 * drbd_send_state() - After a state change, sends the new state to the peer
1012 * @peer_device: DRBD peer device.
1013 * @state: the state to send, not necessarily the current state.
1015 * Each state change queues an "after_state_ch" work, which will eventually
1016 * send the resulting new state to the peer. If more state changes happen
1017 * between queuing and processing of the after_state_ch work, we still
1018 * want to send each intermediary state in the order it occurred.
1020 int drbd_send_state(struct drbd_peer_device *peer_device, union drbd_state state)
1022 struct drbd_socket *sock;
1025 sock = &peer_device->connection->data;
1026 p = drbd_prepare_command(peer_device, sock);
1029 p->state = cpu_to_be32(state.i); /* Within the send mutex */
1030 return drbd_send_command(peer_device, sock, P_STATE, sizeof(*p), NULL, 0);
1033 int drbd_send_state_req(struct drbd_peer_device *peer_device, union drbd_state mask, union drbd_state val)
1035 struct drbd_socket *sock;
1036 struct p_req_state *p;
1038 sock = &peer_device->connection->data;
1039 p = drbd_prepare_command(peer_device, sock);
1042 p->mask = cpu_to_be32(mask.i);
1043 p->val = cpu_to_be32(val.i);
1044 return drbd_send_command(peer_device, sock, P_STATE_CHG_REQ, sizeof(*p), NULL, 0);
1047 int conn_send_state_req(struct drbd_connection *connection, union drbd_state mask, union drbd_state val)
1049 enum drbd_packet cmd;
1050 struct drbd_socket *sock;
1051 struct p_req_state *p;
1053 cmd = connection->agreed_pro_version < 100 ? P_STATE_CHG_REQ : P_CONN_ST_CHG_REQ;
1054 sock = &connection->data;
1055 p = conn_prepare_command(connection, sock);
1058 p->mask = cpu_to_be32(mask.i);
1059 p->val = cpu_to_be32(val.i);
1060 return conn_send_command(connection, sock, cmd, sizeof(*p), NULL, 0);
1063 void drbd_send_sr_reply(struct drbd_peer_device *peer_device, enum drbd_state_rv retcode)
1065 struct drbd_socket *sock;
1066 struct p_req_state_reply *p;
1068 sock = &peer_device->connection->meta;
1069 p = drbd_prepare_command(peer_device, sock);
1071 p->retcode = cpu_to_be32(retcode);
1072 drbd_send_command(peer_device, sock, P_STATE_CHG_REPLY, sizeof(*p), NULL, 0);
1076 void conn_send_sr_reply(struct drbd_connection *connection, enum drbd_state_rv retcode)
1078 struct drbd_socket *sock;
1079 struct p_req_state_reply *p;
1080 enum drbd_packet cmd = connection->agreed_pro_version < 100 ? P_STATE_CHG_REPLY : P_CONN_ST_CHG_REPLY;
1082 sock = &connection->meta;
1083 p = conn_prepare_command(connection, sock);
1085 p->retcode = cpu_to_be32(retcode);
1086 conn_send_command(connection, sock, cmd, sizeof(*p), NULL, 0);
1090 static void dcbp_set_code(struct p_compressed_bm *p, enum drbd_bitmap_code code)
1092 BUG_ON(code & ~0xf);
1093 p->encoding = (p->encoding & ~0xf) | code;
1096 static void dcbp_set_start(struct p_compressed_bm *p, int set)
1098 p->encoding = (p->encoding & ~0x80) | (set ? 0x80 : 0);
1101 static void dcbp_set_pad_bits(struct p_compressed_bm *p, int n)
1104 p->encoding = (p->encoding & (~0x7 << 4)) | (n << 4);
1107 static int fill_bitmap_rle_bits(struct drbd_device *device,
1108 struct p_compressed_bm *p,
1110 struct bm_xfer_ctx *c)
1112 struct bitstream bs;
1113 unsigned long plain_bits;
1120 /* may we use this feature? */
1122 use_rle = rcu_dereference(first_peer_device(device)->connection->net_conf)->use_rle;
1124 if (!use_rle || first_peer_device(device)->connection->agreed_pro_version < 90)
1127 if (c->bit_offset >= c->bm_bits)
1128 return 0; /* nothing to do. */
1130 /* use at most thus many bytes */
1131 bitstream_init(&bs, p->code, size, 0);
1132 memset(p->code, 0, size);
1133 /* plain bits covered in this code string */
1136 /* p->encoding & 0x80 stores whether the first run length is set.
1137 * bit offset is implicit.
1138 * start with toggle == 2 to be able to tell the first iteration */
1141 /* see how much plain bits we can stuff into one packet
1142 * using RLE and VLI. */
1144 tmp = (toggle == 0) ? _drbd_bm_find_next_zero(device, c->bit_offset)
1145 : _drbd_bm_find_next(device, c->bit_offset);
1148 rl = tmp - c->bit_offset;
1150 if (toggle == 2) { /* first iteration */
1152 /* the first checked bit was set,
1153 * store start value, */
1154 dcbp_set_start(p, 1);
1155 /* but skip encoding of zero run length */
1159 dcbp_set_start(p, 0);
1162 /* paranoia: catch zero runlength.
1163 * can only happen if bitmap is modified while we scan it. */
1165 drbd_err(device, "unexpected zero runlength while encoding bitmap "
1166 "t:%u bo:%lu\n", toggle, c->bit_offset);
1170 bits = vli_encode_bits(&bs, rl);
1171 if (bits == -ENOBUFS) /* buffer full */
1174 drbd_err(device, "error while encoding bitmap: %d\n", bits);
1180 c->bit_offset = tmp;
1181 } while (c->bit_offset < c->bm_bits);
1183 len = bs.cur.b - p->code + !!bs.cur.bit;
1185 if (plain_bits < (len << 3)) {
1186 /* incompressible with this method.
1187 * we need to rewind both word and bit position. */
1188 c->bit_offset -= plain_bits;
1189 bm_xfer_ctx_bit_to_word_offset(c);
1190 c->bit_offset = c->word_offset * BITS_PER_LONG;
1194 /* RLE + VLI was able to compress it just fine.
1195 * update c->word_offset. */
1196 bm_xfer_ctx_bit_to_word_offset(c);
1198 /* store pad_bits */
1199 dcbp_set_pad_bits(p, (8 - bs.cur.bit) & 0x7);
1205 * send_bitmap_rle_or_plain
1207 * Return 0 when done, 1 when another iteration is needed, and a negative error
1208 * code upon failure.
1211 send_bitmap_rle_or_plain(struct drbd_device *device, struct bm_xfer_ctx *c)
1213 struct drbd_socket *sock = &first_peer_device(device)->connection->data;
1214 unsigned int header_size = drbd_header_size(first_peer_device(device)->connection);
1215 struct p_compressed_bm *p = sock->sbuf + header_size;
1218 len = fill_bitmap_rle_bits(device, p,
1219 DRBD_SOCKET_BUFFER_SIZE - header_size - sizeof(*p), c);
1224 dcbp_set_code(p, RLE_VLI_Bits);
1225 err = __send_command(first_peer_device(device)->connection, device->vnr, sock,
1226 P_COMPRESSED_BITMAP, sizeof(*p) + len,
1229 c->bytes[0] += header_size + sizeof(*p) + len;
1231 if (c->bit_offset >= c->bm_bits)
1234 /* was not compressible.
1235 * send a buffer full of plain text bits instead. */
1236 unsigned int data_size;
1237 unsigned long num_words;
1238 unsigned long *p = sock->sbuf + header_size;
1240 data_size = DRBD_SOCKET_BUFFER_SIZE - header_size;
1241 num_words = min_t(size_t, data_size / sizeof(*p),
1242 c->bm_words - c->word_offset);
1243 len = num_words * sizeof(*p);
1245 drbd_bm_get_lel(device, c->word_offset, num_words, p);
1246 err = __send_command(first_peer_device(device)->connection, device->vnr, sock, P_BITMAP, len, NULL, 0);
1247 c->word_offset += num_words;
1248 c->bit_offset = c->word_offset * BITS_PER_LONG;
1251 c->bytes[1] += header_size + len;
1253 if (c->bit_offset > c->bm_bits)
1254 c->bit_offset = c->bm_bits;
1258 INFO_bm_xfer_stats(device, "send", c);
1266 /* See the comment at receive_bitmap() */
1267 static int _drbd_send_bitmap(struct drbd_device *device)
1269 struct bm_xfer_ctx c;
1272 if (!expect(device->bitmap))
1275 if (get_ldev(device)) {
1276 if (drbd_md_test_flag(device->ldev, MDF_FULL_SYNC)) {
1277 drbd_info(device, "Writing the whole bitmap, MDF_FullSync was set.\n");
1278 drbd_bm_set_all(device);
1279 if (drbd_bm_write(device)) {
1280 /* write_bm did fail! Leave full sync flag set in Meta P_DATA
1281 * but otherwise process as per normal - need to tell other
1282 * side that a full resync is required! */
1283 drbd_err(device, "Failed to write bitmap to disk!\n");
1285 drbd_md_clear_flag(device, MDF_FULL_SYNC);
1286 drbd_md_sync(device);
1292 c = (struct bm_xfer_ctx) {
1293 .bm_bits = drbd_bm_bits(device),
1294 .bm_words = drbd_bm_words(device),
1298 err = send_bitmap_rle_or_plain(device, &c);
1304 int drbd_send_bitmap(struct drbd_device *device)
1306 struct drbd_socket *sock = &first_peer_device(device)->connection->data;
1309 mutex_lock(&sock->mutex);
1311 err = !_drbd_send_bitmap(device);
1312 mutex_unlock(&sock->mutex);
1316 void drbd_send_b_ack(struct drbd_connection *connection, u32 barrier_nr, u32 set_size)
1318 struct drbd_socket *sock;
1319 struct p_barrier_ack *p;
1321 if (connection->cstate < C_WF_REPORT_PARAMS)
1324 sock = &connection->meta;
1325 p = conn_prepare_command(connection, sock);
1328 p->barrier = barrier_nr;
1329 p->set_size = cpu_to_be32(set_size);
1330 conn_send_command(connection, sock, P_BARRIER_ACK, sizeof(*p), NULL, 0);
1334 * _drbd_send_ack() - Sends an ack packet
1335 * @device: DRBD device.
1336 * @cmd: Packet command code.
1337 * @sector: sector, needs to be in big endian byte order
1338 * @blksize: size in byte, needs to be in big endian byte order
1339 * @block_id: Id, big endian byte order
1341 static int _drbd_send_ack(struct drbd_peer_device *peer_device, enum drbd_packet cmd,
1342 u64 sector, u32 blksize, u64 block_id)
1344 struct drbd_socket *sock;
1345 struct p_block_ack *p;
1347 if (peer_device->device->state.conn < C_CONNECTED)
1350 sock = &peer_device->connection->meta;
1351 p = drbd_prepare_command(peer_device, sock);
1355 p->block_id = block_id;
1356 p->blksize = blksize;
1357 p->seq_num = cpu_to_be32(atomic_inc_return(&peer_device->device->packet_seq));
1358 return drbd_send_command(peer_device, sock, cmd, sizeof(*p), NULL, 0);
1361 /* dp->sector and dp->block_id already/still in network byte order,
1362 * data_size is payload size according to dp->head,
1363 * and may need to be corrected for digest size. */
1364 void drbd_send_ack_dp(struct drbd_peer_device *peer_device, enum drbd_packet cmd,
1365 struct p_data *dp, int data_size)
1367 if (peer_device->connection->peer_integrity_tfm)
1368 data_size -= crypto_shash_digestsize(peer_device->connection->peer_integrity_tfm);
1369 _drbd_send_ack(peer_device, cmd, dp->sector, cpu_to_be32(data_size),
1373 void drbd_send_ack_rp(struct drbd_peer_device *peer_device, enum drbd_packet cmd,
1374 struct p_block_req *rp)
1376 _drbd_send_ack(peer_device, cmd, rp->sector, rp->blksize, rp->block_id);
1380 * drbd_send_ack() - Sends an ack packet
1381 * @device: DRBD device
1382 * @cmd: packet command code
1383 * @peer_req: peer request
1385 int drbd_send_ack(struct drbd_peer_device *peer_device, enum drbd_packet cmd,
1386 struct drbd_peer_request *peer_req)
1388 return _drbd_send_ack(peer_device, cmd,
1389 cpu_to_be64(peer_req->i.sector),
1390 cpu_to_be32(peer_req->i.size),
1391 peer_req->block_id);
1394 /* This function misuses the block_id field to signal if the blocks
1395 * are is sync or not. */
1396 int drbd_send_ack_ex(struct drbd_peer_device *peer_device, enum drbd_packet cmd,
1397 sector_t sector, int blksize, u64 block_id)
1399 return _drbd_send_ack(peer_device, cmd,
1400 cpu_to_be64(sector),
1401 cpu_to_be32(blksize),
1402 cpu_to_be64(block_id));
1405 int drbd_send_rs_deallocated(struct drbd_peer_device *peer_device,
1406 struct drbd_peer_request *peer_req)
1408 struct drbd_socket *sock;
1409 struct p_block_desc *p;
1411 sock = &peer_device->connection->data;
1412 p = drbd_prepare_command(peer_device, sock);
1415 p->sector = cpu_to_be64(peer_req->i.sector);
1416 p->blksize = cpu_to_be32(peer_req->i.size);
1418 return drbd_send_command(peer_device, sock, P_RS_DEALLOCATED, sizeof(*p), NULL, 0);
1421 int drbd_send_drequest(struct drbd_peer_device *peer_device, int cmd,
1422 sector_t sector, int size, u64 block_id)
1424 struct drbd_socket *sock;
1425 struct p_block_req *p;
1427 sock = &peer_device->connection->data;
1428 p = drbd_prepare_command(peer_device, sock);
1431 p->sector = cpu_to_be64(sector);
1432 p->block_id = block_id;
1433 p->blksize = cpu_to_be32(size);
1434 return drbd_send_command(peer_device, sock, cmd, sizeof(*p), NULL, 0);
1437 int drbd_send_drequest_csum(struct drbd_peer_device *peer_device, sector_t sector, int size,
1438 void *digest, int digest_size, enum drbd_packet cmd)
1440 struct drbd_socket *sock;
1441 struct p_block_req *p;
1443 /* FIXME: Put the digest into the preallocated socket buffer. */
1445 sock = &peer_device->connection->data;
1446 p = drbd_prepare_command(peer_device, sock);
1449 p->sector = cpu_to_be64(sector);
1450 p->block_id = ID_SYNCER /* unused */;
1451 p->blksize = cpu_to_be32(size);
1452 return drbd_send_command(peer_device, sock, cmd, sizeof(*p), digest, digest_size);
1455 int drbd_send_ov_request(struct drbd_peer_device *peer_device, sector_t sector, int size)
1457 struct drbd_socket *sock;
1458 struct p_block_req *p;
1460 sock = &peer_device->connection->data;
1461 p = drbd_prepare_command(peer_device, sock);
1464 p->sector = cpu_to_be64(sector);
1465 p->block_id = ID_SYNCER /* unused */;
1466 p->blksize = cpu_to_be32(size);
1467 return drbd_send_command(peer_device, sock, P_OV_REQUEST, sizeof(*p), NULL, 0);
1470 /* called on sndtimeo
1471 * returns false if we should retry,
1472 * true if we think connection is dead
1474 static int we_should_drop_the_connection(struct drbd_connection *connection, struct socket *sock)
1477 /* long elapsed = (long)(jiffies - device->last_received); */
1479 drop_it = connection->meta.socket == sock
1480 || !connection->ack_receiver.task
1481 || get_t_state(&connection->ack_receiver) != RUNNING
1482 || connection->cstate < C_WF_REPORT_PARAMS;
1487 drop_it = !--connection->ko_count;
1489 drbd_err(connection, "[%s/%d] sock_sendmsg time expired, ko = %u\n",
1490 current->comm, current->pid, connection->ko_count);
1491 request_ping(connection);
1494 return drop_it; /* && (device->state == R_PRIMARY) */;
1497 static void drbd_update_congested(struct drbd_connection *connection)
1499 struct sock *sk = connection->data.socket->sk;
1500 if (sk->sk_wmem_queued > sk->sk_sndbuf * 4 / 5)
1501 set_bit(NET_CONGESTED, &connection->flags);
1504 /* The idea of sendpage seems to be to put some kind of reference
1505 * to the page into the skb, and to hand it over to the NIC. In
1506 * this process get_page() gets called.
1508 * As soon as the page was really sent over the network put_page()
1509 * gets called by some part of the network layer. [ NIC driver? ]
1511 * [ get_page() / put_page() increment/decrement the count. If count
1512 * reaches 0 the page will be freed. ]
1514 * This works nicely with pages from FSs.
1515 * But this means that in protocol A we might signal IO completion too early!
1517 * In order not to corrupt data during a resync we must make sure
1518 * that we do not reuse our own buffer pages (EEs) to early, therefore
1519 * we have the net_ee list.
1521 * XFS seems to have problems, still, it submits pages with page_count == 0!
1522 * As a workaround, we disable sendpage on pages
1523 * with page_count == 0 or PageSlab.
1525 static int _drbd_no_send_page(struct drbd_peer_device *peer_device, struct page *page,
1526 int offset, size_t size, unsigned msg_flags)
1528 struct socket *socket;
1532 socket = peer_device->connection->data.socket;
1533 addr = kmap(page) + offset;
1534 err = drbd_send_all(peer_device->connection, socket, addr, size, msg_flags);
1537 peer_device->device->send_cnt += size >> 9;
1541 static int _drbd_send_page(struct drbd_peer_device *peer_device, struct page *page,
1542 int offset, size_t size, unsigned msg_flags)
1544 struct socket *socket = peer_device->connection->data.socket;
1548 /* e.g. XFS meta- & log-data is in slab pages, which have a
1549 * page_count of 0 and/or have PageSlab() set.
1550 * we cannot use send_page for those, as that does get_page();
1551 * put_page(); and would cause either a VM_BUG directly, or
1552 * __page_cache_release a page that would actually still be referenced
1553 * by someone, leading to some obscure delayed Oops somewhere else. */
1554 if (drbd_disable_sendpage || (page_count(page) < 1) || PageSlab(page))
1555 return _drbd_no_send_page(peer_device, page, offset, size, msg_flags);
1557 msg_flags |= MSG_NOSIGNAL;
1558 drbd_update_congested(peer_device->connection);
1562 sent = socket->ops->sendpage(socket, page, offset, len, msg_flags);
1564 if (sent == -EAGAIN) {
1565 if (we_should_drop_the_connection(peer_device->connection, socket))
1569 drbd_warn(peer_device->device, "%s: size=%d len=%d sent=%d\n",
1570 __func__, (int)size, len, sent);
1577 } while (len > 0 /* THINK && device->cstate >= C_CONNECTED*/);
1578 clear_bit(NET_CONGESTED, &peer_device->connection->flags);
1582 peer_device->device->send_cnt += size >> 9;
1587 static int _drbd_send_bio(struct drbd_peer_device *peer_device, struct bio *bio)
1589 struct bio_vec bvec;
1590 struct bvec_iter iter;
1592 /* hint all but last page with MSG_MORE */
1593 bio_for_each_segment(bvec, bio, iter) {
1596 err = _drbd_no_send_page(peer_device, bvec.bv_page,
1597 bvec.bv_offset, bvec.bv_len,
1598 bio_iter_last(bvec, iter)
1602 /* REQ_OP_WRITE_SAME has only one segment */
1603 if (bio_op(bio) == REQ_OP_WRITE_SAME)
1609 static int _drbd_send_zc_bio(struct drbd_peer_device *peer_device, struct bio *bio)
1611 struct bio_vec bvec;
1612 struct bvec_iter iter;
1614 /* hint all but last page with MSG_MORE */
1615 bio_for_each_segment(bvec, bio, iter) {
1618 err = _drbd_send_page(peer_device, bvec.bv_page,
1619 bvec.bv_offset, bvec.bv_len,
1620 bio_iter_last(bvec, iter) ? 0 : MSG_MORE);
1623 /* REQ_OP_WRITE_SAME has only one segment */
1624 if (bio_op(bio) == REQ_OP_WRITE_SAME)
1630 static int _drbd_send_zc_ee(struct drbd_peer_device *peer_device,
1631 struct drbd_peer_request *peer_req)
1633 struct page *page = peer_req->pages;
1634 unsigned len = peer_req->i.size;
1637 /* hint all but last page with MSG_MORE */
1638 page_chain_for_each(page) {
1639 unsigned l = min_t(unsigned, len, PAGE_SIZE);
1641 err = _drbd_send_page(peer_device, page, 0, l,
1642 page_chain_next(page) ? MSG_MORE : 0);
1650 static u32 bio_flags_to_wire(struct drbd_connection *connection,
1653 if (connection->agreed_pro_version >= 95)
1654 return (bio->bi_opf & REQ_SYNC ? DP_RW_SYNC : 0) |
1655 (bio->bi_opf & REQ_FUA ? DP_FUA : 0) |
1656 (bio->bi_opf & REQ_PREFLUSH ? DP_FLUSH : 0) |
1657 (bio_op(bio) == REQ_OP_WRITE_SAME ? DP_WSAME : 0) |
1658 (bio_op(bio) == REQ_OP_DISCARD ? DP_DISCARD : 0) |
1659 (bio_op(bio) == REQ_OP_WRITE_ZEROES ?
1660 ((connection->agreed_features & DRBD_FF_WZEROES) ?
1661 (DP_ZEROES |(!(bio->bi_opf & REQ_NOUNMAP) ? DP_DISCARD : 0))
1665 return bio->bi_opf & REQ_SYNC ? DP_RW_SYNC : 0;
1668 /* Used to send write or TRIM aka REQ_OP_DISCARD requests
1669 * R_PRIMARY -> Peer (P_DATA, P_TRIM)
1671 int drbd_send_dblock(struct drbd_peer_device *peer_device, struct drbd_request *req)
1673 struct drbd_device *device = peer_device->device;
1674 struct drbd_socket *sock;
1676 struct p_wsame *wsame = NULL;
1678 unsigned int dp_flags = 0;
1682 sock = &peer_device->connection->data;
1683 p = drbd_prepare_command(peer_device, sock);
1684 digest_size = peer_device->connection->integrity_tfm ?
1685 crypto_shash_digestsize(peer_device->connection->integrity_tfm) : 0;
1689 p->sector = cpu_to_be64(req->i.sector);
1690 p->block_id = (unsigned long)req;
1691 p->seq_num = cpu_to_be32(atomic_inc_return(&device->packet_seq));
1692 dp_flags = bio_flags_to_wire(peer_device->connection, req->master_bio);
1693 if (device->state.conn >= C_SYNC_SOURCE &&
1694 device->state.conn <= C_PAUSED_SYNC_T)
1695 dp_flags |= DP_MAY_SET_IN_SYNC;
1696 if (peer_device->connection->agreed_pro_version >= 100) {
1697 if (req->rq_state & RQ_EXP_RECEIVE_ACK)
1698 dp_flags |= DP_SEND_RECEIVE_ACK;
1699 /* During resync, request an explicit write ack,
1700 * even in protocol != C */
1701 if (req->rq_state & RQ_EXP_WRITE_ACK
1702 || (dp_flags & DP_MAY_SET_IN_SYNC))
1703 dp_flags |= DP_SEND_WRITE_ACK;
1705 p->dp_flags = cpu_to_be32(dp_flags);
1707 if (dp_flags & (DP_DISCARD|DP_ZEROES)) {
1708 enum drbd_packet cmd = (dp_flags & DP_ZEROES) ? P_ZEROES : P_TRIM;
1709 struct p_trim *t = (struct p_trim*)p;
1710 t->size = cpu_to_be32(req->i.size);
1711 err = __send_command(peer_device->connection, device->vnr, sock, cmd, sizeof(*t), NULL, 0);
1714 if (dp_flags & DP_WSAME) {
1715 /* this will only work if DRBD_FF_WSAME is set AND the
1716 * handshake agreed that all nodes and backend devices are
1717 * WRITE_SAME capable and agree on logical_block_size */
1718 wsame = (struct p_wsame*)p;
1719 digest_out = wsame + 1;
1720 wsame->size = cpu_to_be32(req->i.size);
1724 /* our digest is still only over the payload.
1725 * TRIM does not carry any payload. */
1727 drbd_csum_bio(peer_device->connection->integrity_tfm, req->master_bio, digest_out);
1730 __send_command(peer_device->connection, device->vnr, sock, P_WSAME,
1731 sizeof(*wsame) + digest_size, NULL,
1732 bio_iovec(req->master_bio).bv_len);
1735 __send_command(peer_device->connection, device->vnr, sock, P_DATA,
1736 sizeof(*p) + digest_size, NULL, req->i.size);
1738 /* For protocol A, we have to memcpy the payload into
1739 * socket buffers, as we may complete right away
1740 * as soon as we handed it over to tcp, at which point the data
1741 * pages may become invalid.
1743 * For data-integrity enabled, we copy it as well, so we can be
1744 * sure that even if the bio pages may still be modified, it
1745 * won't change the data on the wire, thus if the digest checks
1746 * out ok after sending on this side, but does not fit on the
1747 * receiving side, we sure have detected corruption elsewhere.
1749 if (!(req->rq_state & (RQ_EXP_RECEIVE_ACK | RQ_EXP_WRITE_ACK)) || digest_size)
1750 err = _drbd_send_bio(peer_device, req->master_bio);
1752 err = _drbd_send_zc_bio(peer_device, req->master_bio);
1754 /* double check digest, sometimes buffers have been modified in flight. */
1755 if (digest_size > 0 && digest_size <= 64) {
1756 /* 64 byte, 512 bit, is the largest digest size
1757 * currently supported in kernel crypto. */
1758 unsigned char digest[64];
1759 drbd_csum_bio(peer_device->connection->integrity_tfm, req->master_bio, digest);
1760 if (memcmp(p + 1, digest, digest_size)) {
1762 "Digest mismatch, buffer modified by upper layers during write: %llus +%u\n",
1763 (unsigned long long)req->i.sector, req->i.size);
1765 } /* else if (digest_size > 64) {
1766 ... Be noisy about digest too large ...
1770 mutex_unlock(&sock->mutex); /* locked by drbd_prepare_command() */
1775 /* answer packet, used to send data back for read requests:
1776 * Peer -> (diskless) R_PRIMARY (P_DATA_REPLY)
1777 * C_SYNC_SOURCE -> C_SYNC_TARGET (P_RS_DATA_REPLY)
1779 int drbd_send_block(struct drbd_peer_device *peer_device, enum drbd_packet cmd,
1780 struct drbd_peer_request *peer_req)
1782 struct drbd_device *device = peer_device->device;
1783 struct drbd_socket *sock;
1788 sock = &peer_device->connection->data;
1789 p = drbd_prepare_command(peer_device, sock);
1791 digest_size = peer_device->connection->integrity_tfm ?
1792 crypto_shash_digestsize(peer_device->connection->integrity_tfm) : 0;
1796 p->sector = cpu_to_be64(peer_req->i.sector);
1797 p->block_id = peer_req->block_id;
1798 p->seq_num = 0; /* unused */
1801 drbd_csum_ee(peer_device->connection->integrity_tfm, peer_req, p + 1);
1802 err = __send_command(peer_device->connection, device->vnr, sock, cmd, sizeof(*p) + digest_size, NULL, peer_req->i.size);
1804 err = _drbd_send_zc_ee(peer_device, peer_req);
1805 mutex_unlock(&sock->mutex); /* locked by drbd_prepare_command() */
1810 int drbd_send_out_of_sync(struct drbd_peer_device *peer_device, struct drbd_request *req)
1812 struct drbd_socket *sock;
1813 struct p_block_desc *p;
1815 sock = &peer_device->connection->data;
1816 p = drbd_prepare_command(peer_device, sock);
1819 p->sector = cpu_to_be64(req->i.sector);
1820 p->blksize = cpu_to_be32(req->i.size);
1821 return drbd_send_command(peer_device, sock, P_OUT_OF_SYNC, sizeof(*p), NULL, 0);
1825 drbd_send distinguishes two cases:
1827 Packets sent via the data socket "sock"
1828 and packets sent via the meta data socket "msock"
1831 -----------------+-------------------------+------------------------------
1832 timeout conf.timeout / 2 conf.timeout / 2
1833 timeout action send a ping via msock Abort communication
1834 and close all sockets
1838 * you must have down()ed the appropriate [m]sock_mutex elsewhere!
1840 int drbd_send(struct drbd_connection *connection, struct socket *sock,
1841 void *buf, size_t size, unsigned msg_flags)
1843 struct kvec iov = {.iov_base = buf, .iov_len = size};
1844 struct msghdr msg = {.msg_flags = msg_flags | MSG_NOSIGNAL};
1850 /* THINK if (signal_pending) return ... ? */
1852 iov_iter_kvec(&msg.msg_iter, WRITE, &iov, 1, size);
1854 if (sock == connection->data.socket) {
1856 connection->ko_count = rcu_dereference(connection->net_conf)->ko_count;
1858 drbd_update_congested(connection);
1861 rv = sock_sendmsg(sock, &msg);
1862 if (rv == -EAGAIN) {
1863 if (we_should_drop_the_connection(connection, sock))
1869 flush_signals(current);
1875 } while (sent < size);
1877 if (sock == connection->data.socket)
1878 clear_bit(NET_CONGESTED, &connection->flags);
1881 if (rv != -EAGAIN) {
1882 drbd_err(connection, "%s_sendmsg returned %d\n",
1883 sock == connection->meta.socket ? "msock" : "sock",
1885 conn_request_state(connection, NS(conn, C_BROKEN_PIPE), CS_HARD);
1887 conn_request_state(connection, NS(conn, C_TIMEOUT), CS_HARD);
1894 * drbd_send_all - Send an entire buffer
1896 * Returns 0 upon success and a negative error value otherwise.
1898 int drbd_send_all(struct drbd_connection *connection, struct socket *sock, void *buffer,
1899 size_t size, unsigned msg_flags)
1903 err = drbd_send(connection, sock, buffer, size, msg_flags);
1911 static int drbd_open(struct block_device *bdev, fmode_t mode)
1913 struct drbd_device *device = bdev->bd_disk->private_data;
1914 unsigned long flags;
1917 mutex_lock(&drbd_main_mutex);
1918 spin_lock_irqsave(&device->resource->req_lock, flags);
1919 /* to have a stable device->state.role
1920 * and no race with updating open_cnt */
1922 if (device->state.role != R_PRIMARY) {
1923 if (mode & FMODE_WRITE)
1925 else if (!drbd_allow_oos)
1931 spin_unlock_irqrestore(&device->resource->req_lock, flags);
1932 mutex_unlock(&drbd_main_mutex);
1937 static void drbd_release(struct gendisk *gd, fmode_t mode)
1939 struct drbd_device *device = gd->private_data;
1940 mutex_lock(&drbd_main_mutex);
1942 mutex_unlock(&drbd_main_mutex);
1945 /* need to hold resource->req_lock */
1946 void drbd_queue_unplug(struct drbd_device *device)
1948 if (device->state.pdsk >= D_INCONSISTENT && device->state.conn >= C_CONNECTED) {
1949 D_ASSERT(device, device->state.role == R_PRIMARY);
1950 if (test_and_clear_bit(UNPLUG_REMOTE, &device->flags)) {
1951 drbd_queue_work_if_unqueued(
1952 &first_peer_device(device)->connection->sender_work,
1953 &device->unplug_work);
1958 static void drbd_set_defaults(struct drbd_device *device)
1960 /* Beware! The actual layout differs
1961 * between big endian and little endian */
1962 device->state = (union drbd_dev_state) {
1963 { .role = R_SECONDARY,
1965 .conn = C_STANDALONE,
1971 void drbd_init_set_defaults(struct drbd_device *device)
1973 /* the memset(,0,) did most of this.
1974 * note: only assignments, no allocation in here */
1976 drbd_set_defaults(device);
1978 atomic_set(&device->ap_bio_cnt, 0);
1979 atomic_set(&device->ap_actlog_cnt, 0);
1980 atomic_set(&device->ap_pending_cnt, 0);
1981 atomic_set(&device->rs_pending_cnt, 0);
1982 atomic_set(&device->unacked_cnt, 0);
1983 atomic_set(&device->local_cnt, 0);
1984 atomic_set(&device->pp_in_use_by_net, 0);
1985 atomic_set(&device->rs_sect_in, 0);
1986 atomic_set(&device->rs_sect_ev, 0);
1987 atomic_set(&device->ap_in_flight, 0);
1988 atomic_set(&device->md_io.in_use, 0);
1990 mutex_init(&device->own_state_mutex);
1991 device->state_mutex = &device->own_state_mutex;
1993 spin_lock_init(&device->al_lock);
1994 spin_lock_init(&device->peer_seq_lock);
1996 INIT_LIST_HEAD(&device->active_ee);
1997 INIT_LIST_HEAD(&device->sync_ee);
1998 INIT_LIST_HEAD(&device->done_ee);
1999 INIT_LIST_HEAD(&device->read_ee);
2000 INIT_LIST_HEAD(&device->net_ee);
2001 INIT_LIST_HEAD(&device->resync_reads);
2002 INIT_LIST_HEAD(&device->resync_work.list);
2003 INIT_LIST_HEAD(&device->unplug_work.list);
2004 INIT_LIST_HEAD(&device->bm_io_work.w.list);
2005 INIT_LIST_HEAD(&device->pending_master_completion[0]);
2006 INIT_LIST_HEAD(&device->pending_master_completion[1]);
2007 INIT_LIST_HEAD(&device->pending_completion[0]);
2008 INIT_LIST_HEAD(&device->pending_completion[1]);
2010 device->resync_work.cb = w_resync_timer;
2011 device->unplug_work.cb = w_send_write_hint;
2012 device->bm_io_work.w.cb = w_bitmap_io;
2014 timer_setup(&device->resync_timer, resync_timer_fn, 0);
2015 timer_setup(&device->md_sync_timer, md_sync_timer_fn, 0);
2016 timer_setup(&device->start_resync_timer, start_resync_timer_fn, 0);
2017 timer_setup(&device->request_timer, request_timer_fn, 0);
2019 init_waitqueue_head(&device->misc_wait);
2020 init_waitqueue_head(&device->state_wait);
2021 init_waitqueue_head(&device->ee_wait);
2022 init_waitqueue_head(&device->al_wait);
2023 init_waitqueue_head(&device->seq_wait);
2025 device->resync_wenr = LC_FREE;
2026 device->peer_max_bio_size = DRBD_MAX_BIO_SIZE_SAFE;
2027 device->local_max_bio_size = DRBD_MAX_BIO_SIZE_SAFE;
2030 static void _drbd_set_my_capacity(struct drbd_device *device, sector_t size)
2032 /* set_capacity(device->this_bdev->bd_disk, size); */
2033 set_capacity(device->vdisk, size);
2034 device->this_bdev->bd_inode->i_size = (loff_t)size << 9;
2037 void drbd_set_my_capacity(struct drbd_device *device, sector_t size)
2040 _drbd_set_my_capacity(device, size);
2041 drbd_info(device, "size = %s (%llu KB)\n",
2042 ppsize(ppb, size>>1), (unsigned long long)size>>1);
2045 void drbd_device_cleanup(struct drbd_device *device)
2048 if (first_peer_device(device)->connection->receiver.t_state != NONE)
2049 drbd_err(device, "ASSERT FAILED: receiver t_state == %d expected 0.\n",
2050 first_peer_device(device)->connection->receiver.t_state);
2052 device->al_writ_cnt =
2053 device->bm_writ_cnt =
2061 device->rs_failed = 0;
2062 device->rs_last_events = 0;
2063 device->rs_last_sect_ev = 0;
2064 for (i = 0; i < DRBD_SYNC_MARKS; i++) {
2065 device->rs_mark_left[i] = 0;
2066 device->rs_mark_time[i] = 0;
2068 D_ASSERT(device, first_peer_device(device)->connection->net_conf == NULL);
2070 _drbd_set_my_capacity(device, 0);
2071 if (device->bitmap) {
2072 /* maybe never allocated. */
2073 drbd_bm_resize(device, 0, 1);
2074 drbd_bm_cleanup(device);
2077 drbd_backing_dev_free(device, device->ldev);
2078 device->ldev = NULL;
2080 clear_bit(AL_SUSPENDED, &device->flags);
2082 D_ASSERT(device, list_empty(&device->active_ee));
2083 D_ASSERT(device, list_empty(&device->sync_ee));
2084 D_ASSERT(device, list_empty(&device->done_ee));
2085 D_ASSERT(device, list_empty(&device->read_ee));
2086 D_ASSERT(device, list_empty(&device->net_ee));
2087 D_ASSERT(device, list_empty(&device->resync_reads));
2088 D_ASSERT(device, list_empty(&first_peer_device(device)->connection->sender_work.q));
2089 D_ASSERT(device, list_empty(&device->resync_work.list));
2090 D_ASSERT(device, list_empty(&device->unplug_work.list));
2092 drbd_set_defaults(device);
2096 static void drbd_destroy_mempools(void)
2100 while (drbd_pp_pool) {
2101 page = drbd_pp_pool;
2102 drbd_pp_pool = (struct page *)page_private(page);
2107 /* D_ASSERT(device, atomic_read(&drbd_pp_vacant)==0); */
2109 bioset_exit(&drbd_io_bio_set);
2110 bioset_exit(&drbd_md_io_bio_set);
2111 mempool_exit(&drbd_md_io_page_pool);
2112 mempool_exit(&drbd_ee_mempool);
2113 mempool_exit(&drbd_request_mempool);
2114 kmem_cache_destroy(drbd_ee_cache);
2115 kmem_cache_destroy(drbd_request_cache);
2116 kmem_cache_destroy(drbd_bm_ext_cache);
2117 kmem_cache_destroy(drbd_al_ext_cache);
2119 drbd_ee_cache = NULL;
2120 drbd_request_cache = NULL;
2121 drbd_bm_ext_cache = NULL;
2122 drbd_al_ext_cache = NULL;
2127 static int drbd_create_mempools(void)
2130 const int number = (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * drbd_minor_count;
2134 drbd_request_cache = kmem_cache_create(
2135 "drbd_req", sizeof(struct drbd_request), 0, 0, NULL);
2136 if (drbd_request_cache == NULL)
2139 drbd_ee_cache = kmem_cache_create(
2140 "drbd_ee", sizeof(struct drbd_peer_request), 0, 0, NULL);
2141 if (drbd_ee_cache == NULL)
2144 drbd_bm_ext_cache = kmem_cache_create(
2145 "drbd_bm", sizeof(struct bm_extent), 0, 0, NULL);
2146 if (drbd_bm_ext_cache == NULL)
2149 drbd_al_ext_cache = kmem_cache_create(
2150 "drbd_al", sizeof(struct lc_element), 0, 0, NULL);
2151 if (drbd_al_ext_cache == NULL)
2155 ret = bioset_init(&drbd_io_bio_set, BIO_POOL_SIZE, 0, 0);
2159 ret = bioset_init(&drbd_md_io_bio_set, DRBD_MIN_POOL_PAGES, 0,
2164 ret = mempool_init_page_pool(&drbd_md_io_page_pool, DRBD_MIN_POOL_PAGES, 0);
2168 ret = mempool_init_slab_pool(&drbd_request_mempool, number,
2169 drbd_request_cache);
2173 ret = mempool_init_slab_pool(&drbd_ee_mempool, number, drbd_ee_cache);
2177 /* drbd's page pool */
2178 spin_lock_init(&drbd_pp_lock);
2180 for (i = 0; i < number; i++) {
2181 page = alloc_page(GFP_HIGHUSER);
2184 set_page_private(page, (unsigned long)drbd_pp_pool);
2185 drbd_pp_pool = page;
2187 drbd_pp_vacant = number;
2192 drbd_destroy_mempools(); /* in case we allocated some */
2196 static void drbd_release_all_peer_reqs(struct drbd_device *device)
2200 rr = drbd_free_peer_reqs(device, &device->active_ee);
2202 drbd_err(device, "%d EEs in active list found!\n", rr);
2204 rr = drbd_free_peer_reqs(device, &device->sync_ee);
2206 drbd_err(device, "%d EEs in sync list found!\n", rr);
2208 rr = drbd_free_peer_reqs(device, &device->read_ee);
2210 drbd_err(device, "%d EEs in read list found!\n", rr);
2212 rr = drbd_free_peer_reqs(device, &device->done_ee);
2214 drbd_err(device, "%d EEs in done list found!\n", rr);
2216 rr = drbd_free_peer_reqs(device, &device->net_ee);
2218 drbd_err(device, "%d EEs in net list found!\n", rr);
2221 /* caution. no locking. */
2222 void drbd_destroy_device(struct kref *kref)
2224 struct drbd_device *device = container_of(kref, struct drbd_device, kref);
2225 struct drbd_resource *resource = device->resource;
2226 struct drbd_peer_device *peer_device, *tmp_peer_device;
2228 del_timer_sync(&device->request_timer);
2230 /* paranoia asserts */
2231 D_ASSERT(device, device->open_cnt == 0);
2232 /* end paranoia asserts */
2234 /* cleanup stuff that may have been allocated during
2235 * device (re-)configuration or state changes */
2237 if (device->this_bdev)
2238 bdput(device->this_bdev);
2240 drbd_backing_dev_free(device, device->ldev);
2241 device->ldev = NULL;
2243 drbd_release_all_peer_reqs(device);
2245 lc_destroy(device->act_log);
2246 lc_destroy(device->resync);
2248 kfree(device->p_uuid);
2249 /* device->p_uuid = NULL; */
2251 if (device->bitmap) /* should no longer be there. */
2252 drbd_bm_cleanup(device);
2253 __free_page(device->md_io.page);
2254 put_disk(device->vdisk);
2255 blk_cleanup_queue(device->rq_queue);
2256 kfree(device->rs_plan_s);
2258 /* not for_each_connection(connection, resource):
2259 * those may have been cleaned up and disassociated already.
2261 for_each_peer_device_safe(peer_device, tmp_peer_device, device) {
2262 kref_put(&peer_device->connection->kref, drbd_destroy_connection);
2265 memset(device, 0xfd, sizeof(*device));
2267 kref_put(&resource->kref, drbd_destroy_resource);
2270 /* One global retry thread, if we need to push back some bio and have it
2271 * reinserted through our make request function.
2273 static struct retry_worker {
2274 struct workqueue_struct *wq;
2275 struct work_struct worker;
2278 struct list_head writes;
2281 static void do_retry(struct work_struct *ws)
2283 struct retry_worker *retry = container_of(ws, struct retry_worker, worker);
2285 struct drbd_request *req, *tmp;
2287 spin_lock_irq(&retry->lock);
2288 list_splice_init(&retry->writes, &writes);
2289 spin_unlock_irq(&retry->lock);
2291 list_for_each_entry_safe(req, tmp, &writes, tl_requests) {
2292 struct drbd_device *device = req->device;
2293 struct bio *bio = req->master_bio;
2294 unsigned long start_jif = req->start_jif;
2298 expect(atomic_read(&req->completion_ref) == 0) &&
2299 expect(req->rq_state & RQ_POSTPONED) &&
2300 expect((req->rq_state & RQ_LOCAL_PENDING) == 0 ||
2301 (req->rq_state & RQ_LOCAL_ABORTED) != 0);
2304 drbd_err(device, "req=%p completion_ref=%d rq_state=%x\n",
2305 req, atomic_read(&req->completion_ref),
2308 /* We still need to put one kref associated with the
2309 * "completion_ref" going zero in the code path that queued it
2310 * here. The request object may still be referenced by a
2311 * frozen local req->private_bio, in case we force-detached.
2313 kref_put(&req->kref, drbd_req_destroy);
2315 /* A single suspended or otherwise blocking device may stall
2316 * all others as well. Fortunately, this code path is to
2317 * recover from a situation that "should not happen":
2318 * concurrent writes in multi-primary setup.
2319 * In a "normal" lifecycle, this workqueue is supposed to be
2320 * destroyed without ever doing anything.
2321 * If it turns out to be an issue anyways, we can do per
2322 * resource (replication group) or per device (minor) retry
2323 * workqueues instead.
2326 /* We are not just doing generic_make_request(),
2327 * as we want to keep the start_time information. */
2329 __drbd_make_request(device, bio, start_jif);
2333 /* called via drbd_req_put_completion_ref(),
2334 * holds resource->req_lock */
2335 void drbd_restart_request(struct drbd_request *req)
2337 unsigned long flags;
2338 spin_lock_irqsave(&retry.lock, flags);
2339 list_move_tail(&req->tl_requests, &retry.writes);
2340 spin_unlock_irqrestore(&retry.lock, flags);
2342 /* Drop the extra reference that would otherwise
2343 * have been dropped by complete_master_bio.
2344 * do_retry() needs to grab a new one. */
2345 dec_ap_bio(req->device);
2347 queue_work(retry.wq, &retry.worker);
2350 void drbd_destroy_resource(struct kref *kref)
2352 struct drbd_resource *resource =
2353 container_of(kref, struct drbd_resource, kref);
2355 idr_destroy(&resource->devices);
2356 free_cpumask_var(resource->cpu_mask);
2357 kfree(resource->name);
2358 memset(resource, 0xf2, sizeof(*resource));
2362 void drbd_free_resource(struct drbd_resource *resource)
2364 struct drbd_connection *connection, *tmp;
2366 for_each_connection_safe(connection, tmp, resource) {
2367 list_del(&connection->connections);
2368 drbd_debugfs_connection_cleanup(connection);
2369 kref_put(&connection->kref, drbd_destroy_connection);
2371 drbd_debugfs_resource_cleanup(resource);
2372 kref_put(&resource->kref, drbd_destroy_resource);
2375 static void drbd_cleanup(void)
2378 struct drbd_device *device;
2379 struct drbd_resource *resource, *tmp;
2381 /* first remove proc,
2382 * drbdsetup uses it's presence to detect
2383 * whether DRBD is loaded.
2384 * If we would get stuck in proc removal,
2385 * but have netlink already deregistered,
2386 * some drbdsetup commands may wait forever
2390 remove_proc_entry("drbd", NULL);
2393 destroy_workqueue(retry.wq);
2395 drbd_genl_unregister();
2397 idr_for_each_entry(&drbd_devices, device, i)
2398 drbd_delete_device(device);
2400 /* not _rcu since, no other updater anymore. Genl already unregistered */
2401 for_each_resource_safe(resource, tmp, &drbd_resources) {
2402 list_del(&resource->resources);
2403 drbd_free_resource(resource);
2406 drbd_debugfs_cleanup();
2408 drbd_destroy_mempools();
2409 unregister_blkdev(DRBD_MAJOR, "drbd");
2411 idr_destroy(&drbd_devices);
2413 pr_info("module cleanup done.\n");
2417 * drbd_congested() - Callback for the flusher thread
2418 * @congested_data: User data
2419 * @bdi_bits: Bits the BDI flusher thread is currently interested in
2421 * Returns 1<<WB_async_congested and/or 1<<WB_sync_congested if we are congested.
2423 static int drbd_congested(void *congested_data, int bdi_bits)
2425 struct drbd_device *device = congested_data;
2426 struct request_queue *q;
2430 if (!may_inc_ap_bio(device)) {
2431 /* DRBD has frozen IO */
2437 if (test_bit(CALLBACK_PENDING, &first_peer_device(device)->connection->flags)) {
2438 r |= (1 << WB_async_congested);
2439 /* Without good local data, we would need to read from remote,
2440 * and that would need the worker thread as well, which is
2441 * currently blocked waiting for that usermode helper to
2444 if (!get_ldev_if_state(device, D_UP_TO_DATE))
2445 r |= (1 << WB_sync_congested);
2453 if (get_ldev(device)) {
2454 q = bdev_get_queue(device->ldev->backing_bdev);
2455 r = bdi_congested(q->backing_dev_info, bdi_bits);
2461 if (bdi_bits & (1 << WB_async_congested) &&
2462 test_bit(NET_CONGESTED, &first_peer_device(device)->connection->flags)) {
2463 r |= (1 << WB_async_congested);
2464 reason = reason == 'b' ? 'a' : 'n';
2468 device->congestion_reason = reason;
2472 static void drbd_init_workqueue(struct drbd_work_queue* wq)
2474 spin_lock_init(&wq->q_lock);
2475 INIT_LIST_HEAD(&wq->q);
2476 init_waitqueue_head(&wq->q_wait);
2479 struct completion_work {
2481 struct completion done;
2484 static int w_complete(struct drbd_work *w, int cancel)
2486 struct completion_work *completion_work =
2487 container_of(w, struct completion_work, w);
2489 complete(&completion_work->done);
2493 void drbd_flush_workqueue(struct drbd_work_queue *work_queue)
2495 struct completion_work completion_work;
2497 completion_work.w.cb = w_complete;
2498 init_completion(&completion_work.done);
2499 drbd_queue_work(work_queue, &completion_work.w);
2500 wait_for_completion(&completion_work.done);
2503 struct drbd_resource *drbd_find_resource(const char *name)
2505 struct drbd_resource *resource;
2507 if (!name || !name[0])
2511 for_each_resource_rcu(resource, &drbd_resources) {
2512 if (!strcmp(resource->name, name)) {
2513 kref_get(&resource->kref);
2523 struct drbd_connection *conn_get_by_addrs(void *my_addr, int my_addr_len,
2524 void *peer_addr, int peer_addr_len)
2526 struct drbd_resource *resource;
2527 struct drbd_connection *connection;
2530 for_each_resource_rcu(resource, &drbd_resources) {
2531 for_each_connection_rcu(connection, resource) {
2532 if (connection->my_addr_len == my_addr_len &&
2533 connection->peer_addr_len == peer_addr_len &&
2534 !memcmp(&connection->my_addr, my_addr, my_addr_len) &&
2535 !memcmp(&connection->peer_addr, peer_addr, peer_addr_len)) {
2536 kref_get(&connection->kref);
2547 static int drbd_alloc_socket(struct drbd_socket *socket)
2549 socket->rbuf = (void *) __get_free_page(GFP_KERNEL);
2552 socket->sbuf = (void *) __get_free_page(GFP_KERNEL);
2558 static void drbd_free_socket(struct drbd_socket *socket)
2560 free_page((unsigned long) socket->sbuf);
2561 free_page((unsigned long) socket->rbuf);
2564 void conn_free_crypto(struct drbd_connection *connection)
2566 drbd_free_sock(connection);
2568 crypto_free_shash(connection->csums_tfm);
2569 crypto_free_shash(connection->verify_tfm);
2570 crypto_free_shash(connection->cram_hmac_tfm);
2571 crypto_free_shash(connection->integrity_tfm);
2572 crypto_free_shash(connection->peer_integrity_tfm);
2573 kfree(connection->int_dig_in);
2574 kfree(connection->int_dig_vv);
2576 connection->csums_tfm = NULL;
2577 connection->verify_tfm = NULL;
2578 connection->cram_hmac_tfm = NULL;
2579 connection->integrity_tfm = NULL;
2580 connection->peer_integrity_tfm = NULL;
2581 connection->int_dig_in = NULL;
2582 connection->int_dig_vv = NULL;
2585 int set_resource_options(struct drbd_resource *resource, struct res_opts *res_opts)
2587 struct drbd_connection *connection;
2588 cpumask_var_t new_cpu_mask;
2591 if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL))
2594 /* silently ignore cpu mask on UP kernel */
2595 if (nr_cpu_ids > 1 && res_opts->cpu_mask[0] != 0) {
2596 err = bitmap_parse(res_opts->cpu_mask, DRBD_CPU_MASK_SIZE,
2597 cpumask_bits(new_cpu_mask), nr_cpu_ids);
2598 if (err == -EOVERFLOW) {
2599 /* So what. mask it out. */
2600 cpumask_var_t tmp_cpu_mask;
2601 if (zalloc_cpumask_var(&tmp_cpu_mask, GFP_KERNEL)) {
2602 cpumask_setall(tmp_cpu_mask);
2603 cpumask_and(new_cpu_mask, new_cpu_mask, tmp_cpu_mask);
2604 drbd_warn(resource, "Overflow in bitmap_parse(%.12s%s), truncating to %u bits\n",
2606 strlen(res_opts->cpu_mask) > 12 ? "..." : "",
2608 free_cpumask_var(tmp_cpu_mask);
2613 drbd_warn(resource, "bitmap_parse() failed with %d\n", err);
2614 /* retcode = ERR_CPU_MASK_PARSE; */
2618 resource->res_opts = *res_opts;
2619 if (cpumask_empty(new_cpu_mask))
2620 drbd_calc_cpu_mask(&new_cpu_mask);
2621 if (!cpumask_equal(resource->cpu_mask, new_cpu_mask)) {
2622 cpumask_copy(resource->cpu_mask, new_cpu_mask);
2623 for_each_connection_rcu(connection, resource) {
2624 connection->receiver.reset_cpu_mask = 1;
2625 connection->ack_receiver.reset_cpu_mask = 1;
2626 connection->worker.reset_cpu_mask = 1;
2632 free_cpumask_var(new_cpu_mask);
2637 struct drbd_resource *drbd_create_resource(const char *name)
2639 struct drbd_resource *resource;
2641 resource = kzalloc(sizeof(struct drbd_resource), GFP_KERNEL);
2644 resource->name = kstrdup(name, GFP_KERNEL);
2645 if (!resource->name)
2646 goto fail_free_resource;
2647 if (!zalloc_cpumask_var(&resource->cpu_mask, GFP_KERNEL))
2648 goto fail_free_name;
2649 kref_init(&resource->kref);
2650 idr_init(&resource->devices);
2651 INIT_LIST_HEAD(&resource->connections);
2652 resource->write_ordering = WO_BDEV_FLUSH;
2653 list_add_tail_rcu(&resource->resources, &drbd_resources);
2654 mutex_init(&resource->conf_update);
2655 mutex_init(&resource->adm_mutex);
2656 spin_lock_init(&resource->req_lock);
2657 drbd_debugfs_resource_add(resource);
2661 kfree(resource->name);
2668 /* caller must be under adm_mutex */
2669 struct drbd_connection *conn_create(const char *name, struct res_opts *res_opts)
2671 struct drbd_resource *resource;
2672 struct drbd_connection *connection;
2674 connection = kzalloc(sizeof(struct drbd_connection), GFP_KERNEL);
2678 if (drbd_alloc_socket(&connection->data))
2680 if (drbd_alloc_socket(&connection->meta))
2683 connection->current_epoch = kzalloc(sizeof(struct drbd_epoch), GFP_KERNEL);
2684 if (!connection->current_epoch)
2687 INIT_LIST_HEAD(&connection->transfer_log);
2689 INIT_LIST_HEAD(&connection->current_epoch->list);
2690 connection->epochs = 1;
2691 spin_lock_init(&connection->epoch_lock);
2693 connection->send.seen_any_write_yet = false;
2694 connection->send.current_epoch_nr = 0;
2695 connection->send.current_epoch_writes = 0;
2697 resource = drbd_create_resource(name);
2701 connection->cstate = C_STANDALONE;
2702 mutex_init(&connection->cstate_mutex);
2703 init_waitqueue_head(&connection->ping_wait);
2704 idr_init(&connection->peer_devices);
2706 drbd_init_workqueue(&connection->sender_work);
2707 mutex_init(&connection->data.mutex);
2708 mutex_init(&connection->meta.mutex);
2710 drbd_thread_init(resource, &connection->receiver, drbd_receiver, "receiver");
2711 connection->receiver.connection = connection;
2712 drbd_thread_init(resource, &connection->worker, drbd_worker, "worker");
2713 connection->worker.connection = connection;
2714 drbd_thread_init(resource, &connection->ack_receiver, drbd_ack_receiver, "ack_recv");
2715 connection->ack_receiver.connection = connection;
2717 kref_init(&connection->kref);
2719 connection->resource = resource;
2721 if (set_resource_options(resource, res_opts))
2724 kref_get(&resource->kref);
2725 list_add_tail_rcu(&connection->connections, &resource->connections);
2726 drbd_debugfs_connection_add(connection);
2730 list_del(&resource->resources);
2731 drbd_free_resource(resource);
2733 kfree(connection->current_epoch);
2734 drbd_free_socket(&connection->meta);
2735 drbd_free_socket(&connection->data);
2740 void drbd_destroy_connection(struct kref *kref)
2742 struct drbd_connection *connection = container_of(kref, struct drbd_connection, kref);
2743 struct drbd_resource *resource = connection->resource;
2745 if (atomic_read(&connection->current_epoch->epoch_size) != 0)
2746 drbd_err(connection, "epoch_size:%d\n", atomic_read(&connection->current_epoch->epoch_size));
2747 kfree(connection->current_epoch);
2749 idr_destroy(&connection->peer_devices);
2751 drbd_free_socket(&connection->meta);
2752 drbd_free_socket(&connection->data);
2753 kfree(connection->int_dig_in);
2754 kfree(connection->int_dig_vv);
2755 memset(connection, 0xfc, sizeof(*connection));
2757 kref_put(&resource->kref, drbd_destroy_resource);
2760 static int init_submitter(struct drbd_device *device)
2762 /* opencoded create_singlethread_workqueue(),
2763 * to be able to say "drbd%d", ..., minor */
2765 alloc_ordered_workqueue("drbd%u_submit", WQ_MEM_RECLAIM, device->minor);
2766 if (!device->submit.wq)
2769 INIT_WORK(&device->submit.worker, do_submit);
2770 INIT_LIST_HEAD(&device->submit.writes);
2774 enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsigned int minor)
2776 struct drbd_resource *resource = adm_ctx->resource;
2777 struct drbd_connection *connection;
2778 struct drbd_device *device;
2779 struct drbd_peer_device *peer_device, *tmp_peer_device;
2780 struct gendisk *disk;
2781 struct request_queue *q;
2783 int vnr = adm_ctx->volume;
2784 enum drbd_ret_code err = ERR_NOMEM;
2786 device = minor_to_device(minor);
2788 return ERR_MINOR_OR_VOLUME_EXISTS;
2790 /* GFP_KERNEL, we are outside of all write-out paths */
2791 device = kzalloc(sizeof(struct drbd_device), GFP_KERNEL);
2794 kref_init(&device->kref);
2796 kref_get(&resource->kref);
2797 device->resource = resource;
2798 device->minor = minor;
2801 drbd_init_set_defaults(device);
2803 q = blk_alloc_queue_node(GFP_KERNEL, NUMA_NO_NODE);
2806 device->rq_queue = q;
2807 q->queuedata = device;
2809 disk = alloc_disk(1);
2812 device->vdisk = disk;
2814 set_disk_ro(disk, true);
2817 disk->major = DRBD_MAJOR;
2818 disk->first_minor = minor;
2819 disk->fops = &drbd_ops;
2820 sprintf(disk->disk_name, "drbd%d", minor);
2821 disk->private_data = device;
2823 device->this_bdev = bdget(MKDEV(DRBD_MAJOR, minor));
2824 /* we have no partitions. we contain only ourselves. */
2825 device->this_bdev->bd_contains = device->this_bdev;
2827 q->backing_dev_info->congested_fn = drbd_congested;
2828 q->backing_dev_info->congested_data = device;
2830 blk_queue_make_request(q, drbd_make_request);
2831 blk_queue_write_cache(q, true, true);
2832 /* Setting the max_hw_sectors to an odd value of 8kibyte here
2833 This triggers a max_bio_size message upon first attach or connect */
2834 blk_queue_max_hw_sectors(q, DRBD_MAX_BIO_SIZE_SAFE >> 8);
2836 device->md_io.page = alloc_page(GFP_KERNEL);
2837 if (!device->md_io.page)
2838 goto out_no_io_page;
2840 if (drbd_bm_init(device))
2842 device->read_requests = RB_ROOT;
2843 device->write_requests = RB_ROOT;
2845 id = idr_alloc(&drbd_devices, device, minor, minor + 1, GFP_KERNEL);
2848 err = ERR_MINOR_OR_VOLUME_EXISTS;
2849 goto out_no_minor_idr;
2851 kref_get(&device->kref);
2853 id = idr_alloc(&resource->devices, device, vnr, vnr + 1, GFP_KERNEL);
2856 err = ERR_MINOR_OR_VOLUME_EXISTS;
2857 goto out_idr_remove_minor;
2859 kref_get(&device->kref);
2861 INIT_LIST_HEAD(&device->peer_devices);
2862 INIT_LIST_HEAD(&device->pending_bitmap_io);
2863 for_each_connection(connection, resource) {
2864 peer_device = kzalloc(sizeof(struct drbd_peer_device), GFP_KERNEL);
2866 goto out_idr_remove_from_resource;
2867 peer_device->connection = connection;
2868 peer_device->device = device;
2870 list_add(&peer_device->peer_devices, &device->peer_devices);
2871 kref_get(&device->kref);
2873 id = idr_alloc(&connection->peer_devices, peer_device, vnr, vnr + 1, GFP_KERNEL);
2876 err = ERR_INVALID_REQUEST;
2877 goto out_idr_remove_from_resource;
2879 kref_get(&connection->kref);
2880 INIT_WORK(&peer_device->send_acks_work, drbd_send_acks_wf);
2883 if (init_submitter(device)) {
2885 goto out_idr_remove_vol;
2890 /* inherit the connection state */
2891 device->state.conn = first_connection(resource)->cstate;
2892 if (device->state.conn == C_WF_REPORT_PARAMS) {
2893 for_each_peer_device(peer_device, device)
2894 drbd_connected(peer_device);
2896 /* move to create_peer_device() */
2897 for_each_peer_device(peer_device, device)
2898 drbd_debugfs_peer_device_add(peer_device);
2899 drbd_debugfs_device_add(device);
2903 idr_remove(&connection->peer_devices, vnr);
2904 out_idr_remove_from_resource:
2905 for_each_connection(connection, resource) {
2906 peer_device = idr_remove(&connection->peer_devices, vnr);
2908 kref_put(&connection->kref, drbd_destroy_connection);
2910 for_each_peer_device_safe(peer_device, tmp_peer_device, device) {
2911 list_del(&peer_device->peer_devices);
2914 idr_remove(&resource->devices, vnr);
2915 out_idr_remove_minor:
2916 idr_remove(&drbd_devices, minor);
2919 drbd_bm_cleanup(device);
2921 __free_page(device->md_io.page);
2925 blk_cleanup_queue(q);
2927 kref_put(&resource->kref, drbd_destroy_resource);
2932 void drbd_delete_device(struct drbd_device *device)
2934 struct drbd_resource *resource = device->resource;
2935 struct drbd_connection *connection;
2936 struct drbd_peer_device *peer_device;
2938 /* move to free_peer_device() */
2939 for_each_peer_device(peer_device, device)
2940 drbd_debugfs_peer_device_cleanup(peer_device);
2941 drbd_debugfs_device_cleanup(device);
2942 for_each_connection(connection, resource) {
2943 idr_remove(&connection->peer_devices, device->vnr);
2944 kref_put(&device->kref, drbd_destroy_device);
2946 idr_remove(&resource->devices, device->vnr);
2947 kref_put(&device->kref, drbd_destroy_device);
2948 idr_remove(&drbd_devices, device_to_minor(device));
2949 kref_put(&device->kref, drbd_destroy_device);
2950 del_gendisk(device->vdisk);
2952 kref_put(&device->kref, drbd_destroy_device);
2955 static int __init drbd_init(void)
2959 if (drbd_minor_count < DRBD_MINOR_COUNT_MIN || drbd_minor_count > DRBD_MINOR_COUNT_MAX) {
2960 pr_err("invalid minor_count (%d)\n", drbd_minor_count);
2964 drbd_minor_count = DRBD_MINOR_COUNT_DEF;
2968 err = register_blkdev(DRBD_MAJOR, "drbd");
2970 pr_err("unable to register block device major %d\n",
2976 * allocate all necessary structs
2978 init_waitqueue_head(&drbd_pp_wait);
2980 drbd_proc = NULL; /* play safe for drbd_cleanup */
2981 idr_init(&drbd_devices);
2983 mutex_init(&resources_mutex);
2984 INIT_LIST_HEAD(&drbd_resources);
2986 err = drbd_genl_register();
2988 pr_err("unable to register generic netlink family\n");
2992 err = drbd_create_mempools();
2997 drbd_proc = proc_create_single("drbd", S_IFREG | 0444 , NULL, drbd_seq_show);
2999 pr_err("unable to register proc file\n");
3003 retry.wq = create_singlethread_workqueue("drbd-reissue");
3005 pr_err("unable to create retry workqueue\n");
3008 INIT_WORK(&retry.worker, do_retry);
3009 spin_lock_init(&retry.lock);
3010 INIT_LIST_HEAD(&retry.writes);
3012 if (drbd_debugfs_init())
3013 pr_notice("failed to initialize debugfs -- will not be available\n");
3015 pr_info("initialized. "
3016 "Version: " REL_VERSION " (api:%d/proto:%d-%d)\n",
3017 API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX);
3018 pr_info("%s\n", drbd_buildtag());
3019 pr_info("registered as block device major %d\n", DRBD_MAJOR);
3020 return 0; /* Success! */
3025 pr_err("ran out of memory\n");
3027 pr_err("initialization failure\n");
3031 static void drbd_free_one_sock(struct drbd_socket *ds)
3034 mutex_lock(&ds->mutex);
3037 mutex_unlock(&ds->mutex);
3039 /* so debugfs does not need to mutex_lock() */
3041 kernel_sock_shutdown(s, SHUT_RDWR);
3046 void drbd_free_sock(struct drbd_connection *connection)
3048 if (connection->data.socket)
3049 drbd_free_one_sock(&connection->data);
3050 if (connection->meta.socket)
3051 drbd_free_one_sock(&connection->meta);
3054 /* meta data management */
3056 void conn_md_sync(struct drbd_connection *connection)
3058 struct drbd_peer_device *peer_device;
3062 idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
3063 struct drbd_device *device = peer_device->device;
3065 kref_get(&device->kref);
3067 drbd_md_sync(device);
3068 kref_put(&device->kref, drbd_destroy_device);
3074 /* aligned 4kByte */
3075 struct meta_data_on_disk {
3076 u64 la_size_sect; /* last agreed size. */
3077 u64 uuid[UI_SIZE]; /* UUIDs. */
3080 u32 flags; /* MDF */
3083 u32 al_offset; /* offset to this block */
3084 u32 al_nr_extents; /* important for restoring the AL (userspace) */
3085 /* `-- act_log->nr_elements <-- ldev->dc.al_extents */
3086 u32 bm_offset; /* offset to the bitmap, from here */
3087 u32 bm_bytes_per_bit; /* BM_BLOCK_SIZE */
3088 u32 la_peer_max_bio_size; /* last peer max_bio_size */
3090 /* see al_tr_number_to_on_disk_sector() */
3092 u32 al_stripe_size_4k;
3094 u8 reserved_u8[4096 - (7*8 + 10*4)];
3099 void drbd_md_write(struct drbd_device *device, void *b)
3101 struct meta_data_on_disk *buffer = b;
3105 memset(buffer, 0, sizeof(*buffer));
3107 buffer->la_size_sect = cpu_to_be64(drbd_get_capacity(device->this_bdev));
3108 for (i = UI_CURRENT; i < UI_SIZE; i++)
3109 buffer->uuid[i] = cpu_to_be64(device->ldev->md.uuid[i]);
3110 buffer->flags = cpu_to_be32(device->ldev->md.flags);
3111 buffer->magic = cpu_to_be32(DRBD_MD_MAGIC_84_UNCLEAN);
3113 buffer->md_size_sect = cpu_to_be32(device->ldev->md.md_size_sect);
3114 buffer->al_offset = cpu_to_be32(device->ldev->md.al_offset);
3115 buffer->al_nr_extents = cpu_to_be32(device->act_log->nr_elements);
3116 buffer->bm_bytes_per_bit = cpu_to_be32(BM_BLOCK_SIZE);
3117 buffer->device_uuid = cpu_to_be64(device->ldev->md.device_uuid);
3119 buffer->bm_offset = cpu_to_be32(device->ldev->md.bm_offset);
3120 buffer->la_peer_max_bio_size = cpu_to_be32(device->peer_max_bio_size);
3122 buffer->al_stripes = cpu_to_be32(device->ldev->md.al_stripes);
3123 buffer->al_stripe_size_4k = cpu_to_be32(device->ldev->md.al_stripe_size_4k);
3125 D_ASSERT(device, drbd_md_ss(device->ldev) == device->ldev->md.md_offset);
3126 sector = device->ldev->md.md_offset;
3128 if (drbd_md_sync_page_io(device, device->ldev, sector, REQ_OP_WRITE)) {
3129 /* this was a try anyways ... */
3130 drbd_err(device, "meta data update failed!\n");
3131 drbd_chk_io_error(device, 1, DRBD_META_IO_ERROR);
3136 * drbd_md_sync() - Writes the meta data super block if the MD_DIRTY flag bit is set
3137 * @device: DRBD device.
3139 void drbd_md_sync(struct drbd_device *device)
3141 struct meta_data_on_disk *buffer;
3143 /* Don't accidentally change the DRBD meta data layout. */
3144 BUILD_BUG_ON(UI_SIZE != 4);
3145 BUILD_BUG_ON(sizeof(struct meta_data_on_disk) != 4096);
3147 del_timer(&device->md_sync_timer);
3148 /* timer may be rearmed by drbd_md_mark_dirty() now. */
3149 if (!test_and_clear_bit(MD_DIRTY, &device->flags))
3152 /* We use here D_FAILED and not D_ATTACHING because we try to write
3153 * metadata even if we detach due to a disk failure! */
3154 if (!get_ldev_if_state(device, D_FAILED))
3157 buffer = drbd_md_get_buffer(device, __func__);
3161 drbd_md_write(device, buffer);
3163 /* Update device->ldev->md.la_size_sect,
3164 * since we updated it on metadata. */
3165 device->ldev->md.la_size_sect = drbd_get_capacity(device->this_bdev);
3167 drbd_md_put_buffer(device);
3172 static int check_activity_log_stripe_size(struct drbd_device *device,
3173 struct meta_data_on_disk *on_disk,
3174 struct drbd_md *in_core)
3176 u32 al_stripes = be32_to_cpu(on_disk->al_stripes);
3177 u32 al_stripe_size_4k = be32_to_cpu(on_disk->al_stripe_size_4k);
3180 /* both not set: default to old fixed size activity log */
3181 if (al_stripes == 0 && al_stripe_size_4k == 0) {
3183 al_stripe_size_4k = MD_32kB_SECT/8;
3186 /* some paranoia plausibility checks */
3188 /* we need both values to be set */
3189 if (al_stripes == 0 || al_stripe_size_4k == 0)
3192 al_size_4k = (u64)al_stripes * al_stripe_size_4k;
3194 /* Upper limit of activity log area, to avoid potential overflow
3195 * problems in al_tr_number_to_on_disk_sector(). As right now, more
3196 * than 72 * 4k blocks total only increases the amount of history,
3197 * limiting this arbitrarily to 16 GB is not a real limitation ;-) */
3198 if (al_size_4k > (16 * 1024 * 1024/4))
3201 /* Lower limit: we need at least 8 transaction slots (32kB)
3202 * to not break existing setups */
3203 if (al_size_4k < MD_32kB_SECT/8)
3206 in_core->al_stripe_size_4k = al_stripe_size_4k;
3207 in_core->al_stripes = al_stripes;
3208 in_core->al_size_4k = al_size_4k;
3212 drbd_err(device, "invalid activity log striping: al_stripes=%u, al_stripe_size_4k=%u\n",
3213 al_stripes, al_stripe_size_4k);
3217 static int check_offsets_and_sizes(struct drbd_device *device, struct drbd_backing_dev *bdev)
3219 sector_t capacity = drbd_get_capacity(bdev->md_bdev);
3220 struct drbd_md *in_core = &bdev->md;
3221 s32 on_disk_al_sect;
3222 s32 on_disk_bm_sect;
3224 /* The on-disk size of the activity log, calculated from offsets, and
3225 * the size of the activity log calculated from the stripe settings,
3227 * Though we could relax this a bit: it is ok, if the striped activity log
3228 * fits in the available on-disk activity log size.
3229 * Right now, that would break how resize is implemented.
3230 * TODO: make drbd_determine_dev_size() (and the drbdmeta tool) aware
3231 * of possible unused padding space in the on disk layout. */
3232 if (in_core->al_offset < 0) {
3233 if (in_core->bm_offset > in_core->al_offset)
3235 on_disk_al_sect = -in_core->al_offset;
3236 on_disk_bm_sect = in_core->al_offset - in_core->bm_offset;
3238 if (in_core->al_offset != MD_4kB_SECT)
3240 if (in_core->bm_offset < in_core->al_offset + in_core->al_size_4k * MD_4kB_SECT)
3243 on_disk_al_sect = in_core->bm_offset - MD_4kB_SECT;
3244 on_disk_bm_sect = in_core->md_size_sect - in_core->bm_offset;
3247 /* old fixed size meta data is exactly that: fixed. */
3248 if (in_core->meta_dev_idx >= 0) {
3249 if (in_core->md_size_sect != MD_128MB_SECT
3250 || in_core->al_offset != MD_4kB_SECT
3251 || in_core->bm_offset != MD_4kB_SECT + MD_32kB_SECT
3252 || in_core->al_stripes != 1
3253 || in_core->al_stripe_size_4k != MD_32kB_SECT/8)
3257 if (capacity < in_core->md_size_sect)
3259 if (capacity - in_core->md_size_sect < drbd_md_first_sector(bdev))
3262 /* should be aligned, and at least 32k */
3263 if ((on_disk_al_sect & 7) || (on_disk_al_sect < MD_32kB_SECT))
3266 /* should fit (for now: exactly) into the available on-disk space;
3267 * overflow prevention is in check_activity_log_stripe_size() above. */
3268 if (on_disk_al_sect != in_core->al_size_4k * MD_4kB_SECT)
3271 /* again, should be aligned */
3272 if (in_core->bm_offset & 7)
3275 /* FIXME check for device grow with flex external meta data? */
3277 /* can the available bitmap space cover the last agreed device size? */
3278 if (on_disk_bm_sect < (in_core->la_size_sect+7)/MD_4kB_SECT/8/512)
3284 drbd_err(device, "meta data offsets don't make sense: idx=%d "
3285 "al_s=%u, al_sz4k=%u, al_offset=%d, bm_offset=%d, "
3286 "md_size_sect=%u, la_size=%llu, md_capacity=%llu\n",
3287 in_core->meta_dev_idx,
3288 in_core->al_stripes, in_core->al_stripe_size_4k,
3289 in_core->al_offset, in_core->bm_offset, in_core->md_size_sect,
3290 (unsigned long long)in_core->la_size_sect,
3291 (unsigned long long)capacity);
3298 * drbd_md_read() - Reads in the meta data super block
3299 * @device: DRBD device.
3300 * @bdev: Device from which the meta data should be read in.
3302 * Return NO_ERROR on success, and an enum drbd_ret_code in case
3303 * something goes wrong.
3305 * Called exactly once during drbd_adm_attach(), while still being D_DISKLESS,
3306 * even before @bdev is assigned to @device->ldev.
3308 int drbd_md_read(struct drbd_device *device, struct drbd_backing_dev *bdev)
3310 struct meta_data_on_disk *buffer;
3312 int i, rv = NO_ERROR;
3314 if (device->state.disk != D_DISKLESS)
3315 return ERR_DISK_CONFIGURED;
3317 buffer = drbd_md_get_buffer(device, __func__);
3321 /* First, figure out where our meta data superblock is located,
3323 bdev->md.meta_dev_idx = bdev->disk_conf->meta_dev_idx;
3324 bdev->md.md_offset = drbd_md_ss(bdev);
3325 /* Even for (flexible or indexed) external meta data,
3326 * initially restrict us to the 4k superblock for now.
3327 * Affects the paranoia out-of-range access check in drbd_md_sync_page_io(). */
3328 bdev->md.md_size_sect = 8;
3330 if (drbd_md_sync_page_io(device, bdev, bdev->md.md_offset,
3332 /* NOTE: can't do normal error processing here as this is
3333 called BEFORE disk is attached */
3334 drbd_err(device, "Error while reading metadata.\n");
3335 rv = ERR_IO_MD_DISK;
3339 magic = be32_to_cpu(buffer->magic);
3340 flags = be32_to_cpu(buffer->flags);
3341 if (magic == DRBD_MD_MAGIC_84_UNCLEAN ||
3342 (magic == DRBD_MD_MAGIC_08 && !(flags & MDF_AL_CLEAN))) {
3343 /* btw: that's Activity Log clean, not "all" clean. */
3344 drbd_err(device, "Found unclean meta data. Did you \"drbdadm apply-al\"?\n");
3345 rv = ERR_MD_UNCLEAN;
3349 rv = ERR_MD_INVALID;
3350 if (magic != DRBD_MD_MAGIC_08) {
3351 if (magic == DRBD_MD_MAGIC_07)
3352 drbd_err(device, "Found old (0.7) meta data magic. Did you \"drbdadm create-md\"?\n");
3354 drbd_err(device, "Meta data magic not found. Did you \"drbdadm create-md\"?\n");
3358 if (be32_to_cpu(buffer->bm_bytes_per_bit) != BM_BLOCK_SIZE) {
3359 drbd_err(device, "unexpected bm_bytes_per_bit: %u (expected %u)\n",
3360 be32_to_cpu(buffer->bm_bytes_per_bit), BM_BLOCK_SIZE);
3365 /* convert to in_core endian */
3366 bdev->md.la_size_sect = be64_to_cpu(buffer->la_size_sect);
3367 for (i = UI_CURRENT; i < UI_SIZE; i++)
3368 bdev->md.uuid[i] = be64_to_cpu(buffer->uuid[i]);
3369 bdev->md.flags = be32_to_cpu(buffer->flags);
3370 bdev->md.device_uuid = be64_to_cpu(buffer->device_uuid);
3372 bdev->md.md_size_sect = be32_to_cpu(buffer->md_size_sect);
3373 bdev->md.al_offset = be32_to_cpu(buffer->al_offset);
3374 bdev->md.bm_offset = be32_to_cpu(buffer->bm_offset);
3376 if (check_activity_log_stripe_size(device, buffer, &bdev->md))
3378 if (check_offsets_and_sizes(device, bdev))
3381 if (be32_to_cpu(buffer->bm_offset) != bdev->md.bm_offset) {
3382 drbd_err(device, "unexpected bm_offset: %d (expected %d)\n",
3383 be32_to_cpu(buffer->bm_offset), bdev->md.bm_offset);
3386 if (be32_to_cpu(buffer->md_size_sect) != bdev->md.md_size_sect) {
3387 drbd_err(device, "unexpected md_size: %u (expected %u)\n",
3388 be32_to_cpu(buffer->md_size_sect), bdev->md.md_size_sect);
3394 spin_lock_irq(&device->resource->req_lock);
3395 if (device->state.conn < C_CONNECTED) {
3397 peer = be32_to_cpu(buffer->la_peer_max_bio_size);
3398 peer = max(peer, DRBD_MAX_BIO_SIZE_SAFE);
3399 device->peer_max_bio_size = peer;
3401 spin_unlock_irq(&device->resource->req_lock);
3404 drbd_md_put_buffer(device);
3410 * drbd_md_mark_dirty() - Mark meta data super block as dirty
3411 * @device: DRBD device.
3413 * Call this function if you change anything that should be written to
3414 * the meta-data super block. This function sets MD_DIRTY, and starts a
3415 * timer that ensures that within five seconds you have to call drbd_md_sync().
3418 void drbd_md_mark_dirty_(struct drbd_device *device, unsigned int line, const char *func)
3420 if (!test_and_set_bit(MD_DIRTY, &device->flags)) {
3421 mod_timer(&device->md_sync_timer, jiffies + HZ);
3422 device->last_md_mark_dirty.line = line;
3423 device->last_md_mark_dirty.func = func;
3427 void drbd_md_mark_dirty(struct drbd_device *device)
3429 if (!test_and_set_bit(MD_DIRTY, &device->flags))
3430 mod_timer(&device->md_sync_timer, jiffies + 5*HZ);
3434 void drbd_uuid_move_history(struct drbd_device *device) __must_hold(local)
3438 for (i = UI_HISTORY_START; i < UI_HISTORY_END; i++)
3439 device->ldev->md.uuid[i+1] = device->ldev->md.uuid[i];
3442 void __drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local)
3444 if (idx == UI_CURRENT) {
3445 if (device->state.role == R_PRIMARY)
3450 drbd_set_ed_uuid(device, val);
3453 device->ldev->md.uuid[idx] = val;
3454 drbd_md_mark_dirty(device);
3457 void _drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local)
3459 unsigned long flags;
3460 spin_lock_irqsave(&device->ldev->md.uuid_lock, flags);
3461 __drbd_uuid_set(device, idx, val);
3462 spin_unlock_irqrestore(&device->ldev->md.uuid_lock, flags);
3465 void drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local)
3467 unsigned long flags;
3468 spin_lock_irqsave(&device->ldev->md.uuid_lock, flags);
3469 if (device->ldev->md.uuid[idx]) {
3470 drbd_uuid_move_history(device);
3471 device->ldev->md.uuid[UI_HISTORY_START] = device->ldev->md.uuid[idx];
3473 __drbd_uuid_set(device, idx, val);
3474 spin_unlock_irqrestore(&device->ldev->md.uuid_lock, flags);
3478 * drbd_uuid_new_current() - Creates a new current UUID
3479 * @device: DRBD device.
3481 * Creates a new current UUID, and rotates the old current UUID into
3482 * the bitmap slot. Causes an incremental resync upon next connect.
3484 void drbd_uuid_new_current(struct drbd_device *device) __must_hold(local)
3487 unsigned long long bm_uuid;
3489 get_random_bytes(&val, sizeof(u64));
3491 spin_lock_irq(&device->ldev->md.uuid_lock);
3492 bm_uuid = device->ldev->md.uuid[UI_BITMAP];
3495 drbd_warn(device, "bm UUID was already set: %llX\n", bm_uuid);
3497 device->ldev->md.uuid[UI_BITMAP] = device->ldev->md.uuid[UI_CURRENT];
3498 __drbd_uuid_set(device, UI_CURRENT, val);
3499 spin_unlock_irq(&device->ldev->md.uuid_lock);
3501 drbd_print_uuids(device, "new current UUID");
3502 /* get it to stable storage _now_ */
3503 drbd_md_sync(device);
3506 void drbd_uuid_set_bm(struct drbd_device *device, u64 val) __must_hold(local)
3508 unsigned long flags;
3509 if (device->ldev->md.uuid[UI_BITMAP] == 0 && val == 0)
3512 spin_lock_irqsave(&device->ldev->md.uuid_lock, flags);
3514 drbd_uuid_move_history(device);
3515 device->ldev->md.uuid[UI_HISTORY_START] = device->ldev->md.uuid[UI_BITMAP];
3516 device->ldev->md.uuid[UI_BITMAP] = 0;
3518 unsigned long long bm_uuid = device->ldev->md.uuid[UI_BITMAP];
3520 drbd_warn(device, "bm UUID was already set: %llX\n", bm_uuid);
3522 device->ldev->md.uuid[UI_BITMAP] = val & ~((u64)1);
3524 spin_unlock_irqrestore(&device->ldev->md.uuid_lock, flags);
3526 drbd_md_mark_dirty(device);
3530 * drbd_bmio_set_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
3531 * @device: DRBD device.
3533 * Sets all bits in the bitmap and writes the whole bitmap to stable storage.
3535 int drbd_bmio_set_n_write(struct drbd_device *device) __must_hold(local)
3539 drbd_md_set_flag(device, MDF_FULL_SYNC);
3540 drbd_md_sync(device);
3541 drbd_bm_set_all(device);
3543 rv = drbd_bm_write(device);
3546 drbd_md_clear_flag(device, MDF_FULL_SYNC);
3547 drbd_md_sync(device);
3554 * drbd_bmio_clear_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
3555 * @device: DRBD device.
3557 * Clears all bits in the bitmap and writes the whole bitmap to stable storage.
3559 int drbd_bmio_clear_n_write(struct drbd_device *device) __must_hold(local)
3561 drbd_resume_al(device);
3562 drbd_bm_clear_all(device);
3563 return drbd_bm_write(device);
3566 static int w_bitmap_io(struct drbd_work *w, int unused)
3568 struct drbd_device *device =
3569 container_of(w, struct drbd_device, bm_io_work.w);
3570 struct bm_io_work *work = &device->bm_io_work;
3573 if (work->flags != BM_LOCKED_CHANGE_ALLOWED) {
3574 int cnt = atomic_read(&device->ap_bio_cnt);
3576 drbd_err(device, "FIXME: ap_bio_cnt %d, expected 0; queued for '%s'\n",
3580 if (get_ldev(device)) {
3581 drbd_bm_lock(device, work->why, work->flags);
3582 rv = work->io_fn(device);
3583 drbd_bm_unlock(device);
3587 clear_bit_unlock(BITMAP_IO, &device->flags);
3588 wake_up(&device->misc_wait);
3591 work->done(device, rv);
3593 clear_bit(BITMAP_IO_QUEUED, &device->flags);
3601 * drbd_queue_bitmap_io() - Queues an IO operation on the whole bitmap
3602 * @device: DRBD device.
3603 * @io_fn: IO callback to be called when bitmap IO is possible
3604 * @done: callback to be called after the bitmap IO was performed
3605 * @why: Descriptive text of the reason for doing the IO
3607 * While IO on the bitmap happens we freeze application IO thus we ensure
3608 * that drbd_set_out_of_sync() can not be called. This function MAY ONLY be
3609 * called from worker context. It MUST NOT be used while a previous such
3610 * work is still pending!
3612 * Its worker function encloses the call of io_fn() by get_ldev() and
3615 void drbd_queue_bitmap_io(struct drbd_device *device,
3616 int (*io_fn)(struct drbd_device *),
3617 void (*done)(struct drbd_device *, int),
3618 char *why, enum bm_flag flags)
3620 D_ASSERT(device, current == first_peer_device(device)->connection->worker.task);
3622 D_ASSERT(device, !test_bit(BITMAP_IO_QUEUED, &device->flags));
3623 D_ASSERT(device, !test_bit(BITMAP_IO, &device->flags));
3624 D_ASSERT(device, list_empty(&device->bm_io_work.w.list));
3625 if (device->bm_io_work.why)
3626 drbd_err(device, "FIXME going to queue '%s' but '%s' still pending?\n",
3627 why, device->bm_io_work.why);
3629 device->bm_io_work.io_fn = io_fn;
3630 device->bm_io_work.done = done;
3631 device->bm_io_work.why = why;
3632 device->bm_io_work.flags = flags;
3634 spin_lock_irq(&device->resource->req_lock);
3635 set_bit(BITMAP_IO, &device->flags);
3636 /* don't wait for pending application IO if the caller indicates that
3637 * application IO does not conflict anyways. */
3638 if (flags == BM_LOCKED_CHANGE_ALLOWED || atomic_read(&device->ap_bio_cnt) == 0) {
3639 if (!test_and_set_bit(BITMAP_IO_QUEUED, &device->flags))
3640 drbd_queue_work(&first_peer_device(device)->connection->sender_work,
3641 &device->bm_io_work.w);
3643 spin_unlock_irq(&device->resource->req_lock);
3647 * drbd_bitmap_io() - Does an IO operation on the whole bitmap
3648 * @device: DRBD device.
3649 * @io_fn: IO callback to be called when bitmap IO is possible
3650 * @why: Descriptive text of the reason for doing the IO
3652 * freezes application IO while that the actual IO operations runs. This
3653 * functions MAY NOT be called from worker context.
3655 int drbd_bitmap_io(struct drbd_device *device, int (*io_fn)(struct drbd_device *),
3656 char *why, enum bm_flag flags)
3658 /* Only suspend io, if some operation is supposed to be locked out */
3659 const bool do_suspend_io = flags & (BM_DONT_CLEAR|BM_DONT_SET|BM_DONT_TEST);
3662 D_ASSERT(device, current != first_peer_device(device)->connection->worker.task);
3665 drbd_suspend_io(device);
3667 drbd_bm_lock(device, why, flags);
3669 drbd_bm_unlock(device);
3672 drbd_resume_io(device);
3677 void drbd_md_set_flag(struct drbd_device *device, int flag) __must_hold(local)
3679 if ((device->ldev->md.flags & flag) != flag) {
3680 drbd_md_mark_dirty(device);
3681 device->ldev->md.flags |= flag;
3685 void drbd_md_clear_flag(struct drbd_device *device, int flag) __must_hold(local)
3687 if ((device->ldev->md.flags & flag) != 0) {
3688 drbd_md_mark_dirty(device);
3689 device->ldev->md.flags &= ~flag;
3692 int drbd_md_test_flag(struct drbd_backing_dev *bdev, int flag)
3694 return (bdev->md.flags & flag) != 0;
3697 static void md_sync_timer_fn(struct timer_list *t)
3699 struct drbd_device *device = from_timer(device, t, md_sync_timer);
3700 drbd_device_post_work(device, MD_SYNC);
3703 const char *cmdname(enum drbd_packet cmd)
3705 /* THINK may need to become several global tables
3706 * when we want to support more than
3707 * one PRO_VERSION */
3708 static const char *cmdnames[] = {
3710 [P_WSAME] = "WriteSame",
3712 [P_DATA_REPLY] = "DataReply",
3713 [P_RS_DATA_REPLY] = "RSDataReply",
3714 [P_BARRIER] = "Barrier",
3715 [P_BITMAP] = "ReportBitMap",
3716 [P_BECOME_SYNC_TARGET] = "BecomeSyncTarget",
3717 [P_BECOME_SYNC_SOURCE] = "BecomeSyncSource",
3718 [P_UNPLUG_REMOTE] = "UnplugRemote",
3719 [P_DATA_REQUEST] = "DataRequest",
3720 [P_RS_DATA_REQUEST] = "RSDataRequest",
3721 [P_SYNC_PARAM] = "SyncParam",
3722 [P_SYNC_PARAM89] = "SyncParam89",
3723 [P_PROTOCOL] = "ReportProtocol",
3724 [P_UUIDS] = "ReportUUIDs",
3725 [P_SIZES] = "ReportSizes",
3726 [P_STATE] = "ReportState",
3727 [P_SYNC_UUID] = "ReportSyncUUID",
3728 [P_AUTH_CHALLENGE] = "AuthChallenge",
3729 [P_AUTH_RESPONSE] = "AuthResponse",
3731 [P_PING_ACK] = "PingAck",
3732 [P_RECV_ACK] = "RecvAck",
3733 [P_WRITE_ACK] = "WriteAck",
3734 [P_RS_WRITE_ACK] = "RSWriteAck",
3735 [P_SUPERSEDED] = "Superseded",
3736 [P_NEG_ACK] = "NegAck",
3737 [P_NEG_DREPLY] = "NegDReply",
3738 [P_NEG_RS_DREPLY] = "NegRSDReply",
3739 [P_BARRIER_ACK] = "BarrierAck",
3740 [P_STATE_CHG_REQ] = "StateChgRequest",
3741 [P_STATE_CHG_REPLY] = "StateChgReply",
3742 [P_OV_REQUEST] = "OVRequest",
3743 [P_OV_REPLY] = "OVReply",
3744 [P_OV_RESULT] = "OVResult",
3745 [P_CSUM_RS_REQUEST] = "CsumRSRequest",
3746 [P_RS_IS_IN_SYNC] = "CsumRSIsInSync",
3747 [P_COMPRESSED_BITMAP] = "CBitmap",
3748 [P_DELAY_PROBE] = "DelayProbe",
3749 [P_OUT_OF_SYNC] = "OutOfSync",
3750 [P_RETRY_WRITE] = "RetryWrite",
3751 [P_RS_CANCEL] = "RSCancel",
3752 [P_CONN_ST_CHG_REQ] = "conn_st_chg_req",
3753 [P_CONN_ST_CHG_REPLY] = "conn_st_chg_reply",
3754 [P_RETRY_WRITE] = "retry_write",
3755 [P_PROTOCOL_UPDATE] = "protocol_update",
3756 [P_RS_THIN_REQ] = "rs_thin_req",
3757 [P_RS_DEALLOCATED] = "rs_deallocated",
3759 /* enum drbd_packet, but not commands - obsoleted flags:
3765 /* too big for the array: 0xfffX */
3766 if (cmd == P_INITIAL_META)
3767 return "InitialMeta";
3768 if (cmd == P_INITIAL_DATA)
3769 return "InitialData";
3770 if (cmd == P_CONNECTION_FEATURES)
3771 return "ConnectionFeatures";
3772 if (cmd >= ARRAY_SIZE(cmdnames))
3774 return cmdnames[cmd];
3778 * drbd_wait_misc - wait for a request to make progress
3779 * @device: device associated with the request
3780 * @i: the struct drbd_interval embedded in struct drbd_request or
3781 * struct drbd_peer_request
3783 int drbd_wait_misc(struct drbd_device *device, struct drbd_interval *i)
3785 struct net_conf *nc;
3790 nc = rcu_dereference(first_peer_device(device)->connection->net_conf);
3795 timeout = nc->ko_count ? nc->timeout * HZ / 10 * nc->ko_count : MAX_SCHEDULE_TIMEOUT;
3798 /* Indicate to wake up device->misc_wait on progress. */
3800 prepare_to_wait(&device->misc_wait, &wait, TASK_INTERRUPTIBLE);
3801 spin_unlock_irq(&device->resource->req_lock);
3802 timeout = schedule_timeout(timeout);
3803 finish_wait(&device->misc_wait, &wait);
3804 spin_lock_irq(&device->resource->req_lock);
3805 if (!timeout || device->state.conn < C_CONNECTED)
3807 if (signal_pending(current))
3808 return -ERESTARTSYS;
3812 void lock_all_resources(void)
3814 struct drbd_resource *resource;
3815 int __maybe_unused i = 0;
3817 mutex_lock(&resources_mutex);
3818 local_irq_disable();
3819 for_each_resource(resource, &drbd_resources)
3820 spin_lock_nested(&resource->req_lock, i++);
3823 void unlock_all_resources(void)
3825 struct drbd_resource *resource;
3827 for_each_resource(resource, &drbd_resources)
3828 spin_unlock(&resource->req_lock);
3830 mutex_unlock(&resources_mutex);
3833 #ifdef CONFIG_DRBD_FAULT_INJECTION
3834 /* Fault insertion support including random number generator shamelessly
3835 * stolen from kernel/rcutorture.c */
3836 struct fault_random_state {
3837 unsigned long state;
3838 unsigned long count;
3841 #define FAULT_RANDOM_MULT 39916801 /* prime */
3842 #define FAULT_RANDOM_ADD 479001701 /* prime */
3843 #define FAULT_RANDOM_REFRESH 10000
3846 * Crude but fast random-number generator. Uses a linear congruential
3847 * generator, with occasional help from get_random_bytes().
3849 static unsigned long
3850 _drbd_fault_random(struct fault_random_state *rsp)
3854 if (!rsp->count--) {
3855 get_random_bytes(&refresh, sizeof(refresh));
3856 rsp->state += refresh;
3857 rsp->count = FAULT_RANDOM_REFRESH;
3859 rsp->state = rsp->state * FAULT_RANDOM_MULT + FAULT_RANDOM_ADD;
3860 return swahw32(rsp->state);
3864 _drbd_fault_str(unsigned int type) {
3865 static char *_faults[] = {
3866 [DRBD_FAULT_MD_WR] = "Meta-data write",
3867 [DRBD_FAULT_MD_RD] = "Meta-data read",
3868 [DRBD_FAULT_RS_WR] = "Resync write",
3869 [DRBD_FAULT_RS_RD] = "Resync read",
3870 [DRBD_FAULT_DT_WR] = "Data write",
3871 [DRBD_FAULT_DT_RD] = "Data read",
3872 [DRBD_FAULT_DT_RA] = "Data read ahead",
3873 [DRBD_FAULT_BM_ALLOC] = "BM allocation",
3874 [DRBD_FAULT_AL_EE] = "EE allocation",
3875 [DRBD_FAULT_RECEIVE] = "receive data corruption",
3878 return (type < DRBD_FAULT_MAX) ? _faults[type] : "**Unknown**";
3882 _drbd_insert_fault(struct drbd_device *device, unsigned int type)
3884 static struct fault_random_state rrs = {0, 0};
3886 unsigned int ret = (
3887 (drbd_fault_devs == 0 ||
3888 ((1 << device_to_minor(device)) & drbd_fault_devs) != 0) &&
3889 (((_drbd_fault_random(&rrs) % 100) + 1) <= drbd_fault_rate));
3894 if (__ratelimit(&drbd_ratelimit_state))
3895 drbd_warn(device, "***Simulating %s failure\n",
3896 _drbd_fault_str(type));
3903 const char *drbd_buildtag(void)
3905 /* DRBD built from external sources has here a reference to the
3906 git hash of the source code. */
3908 static char buildtag[38] = "\0uilt-in";
3910 if (buildtag[0] == 0) {
3912 sprintf(buildtag, "srcversion: %-24s", THIS_MODULE->srcversion);
3921 module_init(drbd_init)
3922 module_exit(drbd_cleanup)
3924 EXPORT_SYMBOL(drbd_conn_str);
3925 EXPORT_SYMBOL(drbd_role_str);
3926 EXPORT_SYMBOL(drbd_disk_str);
3927 EXPORT_SYMBOL(drbd_set_st_err_str);