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",
325 allow_kernel_signal(DRBD_SIGKILL);
326 allow_kernel_signal(SIGXCPU);
328 retval = thi->function(thi);
330 spin_lock_irqsave(&thi->t_lock, flags);
332 /* if the receiver has been "EXITING", the last thing it did
333 * was set the conn state to "StandAlone",
334 * if now a re-connect request comes in, conn state goes C_UNCONNECTED,
335 * and receiver thread will be "started".
336 * drbd_thread_start needs to set "RESTARTING" in that case.
337 * t_state check and assignment needs to be within the same spinlock,
338 * so either thread_start sees EXITING, and can remap to RESTARTING,
339 * or thread_start see NONE, and can proceed as normal.
342 if (thi->t_state == RESTARTING) {
343 drbd_info(resource, "Restarting %s thread\n", thi->name);
344 thi->t_state = RUNNING;
345 spin_unlock_irqrestore(&thi->t_lock, flags);
352 complete_all(&thi->stop);
353 spin_unlock_irqrestore(&thi->t_lock, flags);
355 drbd_info(resource, "Terminating %s\n", current->comm);
357 /* Release mod reference taken when thread was started */
360 kref_put(&thi->connection->kref, drbd_destroy_connection);
361 kref_put(&resource->kref, drbd_destroy_resource);
362 module_put(THIS_MODULE);
366 static void drbd_thread_init(struct drbd_resource *resource, struct drbd_thread *thi,
367 int (*func) (struct drbd_thread *), const char *name)
369 spin_lock_init(&thi->t_lock);
372 thi->function = func;
373 thi->resource = resource;
374 thi->connection = NULL;
378 int drbd_thread_start(struct drbd_thread *thi)
380 struct drbd_resource *resource = thi->resource;
381 struct task_struct *nt;
384 /* is used from state engine doing drbd_thread_stop_nowait,
385 * while holding the req lock irqsave */
386 spin_lock_irqsave(&thi->t_lock, flags);
388 switch (thi->t_state) {
390 drbd_info(resource, "Starting %s thread (from %s [%d])\n",
391 thi->name, current->comm, current->pid);
393 /* Get ref on module for thread - this is released when thread exits */
394 if (!try_module_get(THIS_MODULE)) {
395 drbd_err(resource, "Failed to get module reference in drbd_thread_start\n");
396 spin_unlock_irqrestore(&thi->t_lock, flags);
400 kref_get(&resource->kref);
402 kref_get(&thi->connection->kref);
404 init_completion(&thi->stop);
405 thi->reset_cpu_mask = 1;
406 thi->t_state = RUNNING;
407 spin_unlock_irqrestore(&thi->t_lock, flags);
408 flush_signals(current); /* otherw. may get -ERESTARTNOINTR */
410 nt = kthread_create(drbd_thread_setup, (void *) thi,
411 "drbd_%c_%s", thi->name[0], thi->resource->name);
414 drbd_err(resource, "Couldn't start thread\n");
417 kref_put(&thi->connection->kref, drbd_destroy_connection);
418 kref_put(&resource->kref, drbd_destroy_resource);
419 module_put(THIS_MODULE);
422 spin_lock_irqsave(&thi->t_lock, flags);
424 thi->t_state = RUNNING;
425 spin_unlock_irqrestore(&thi->t_lock, flags);
429 thi->t_state = RESTARTING;
430 drbd_info(resource, "Restarting %s thread (from %s [%d])\n",
431 thi->name, current->comm, current->pid);
436 spin_unlock_irqrestore(&thi->t_lock, flags);
444 void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait)
448 enum drbd_thread_state ns = restart ? RESTARTING : EXITING;
450 /* may be called from state engine, holding the req lock irqsave */
451 spin_lock_irqsave(&thi->t_lock, flags);
453 if (thi->t_state == NONE) {
454 spin_unlock_irqrestore(&thi->t_lock, flags);
456 drbd_thread_start(thi);
460 if (thi->t_state != ns) {
461 if (thi->task == NULL) {
462 spin_unlock_irqrestore(&thi->t_lock, flags);
468 init_completion(&thi->stop);
469 if (thi->task != current)
470 send_sig(DRBD_SIGKILL, thi->task, 1);
473 spin_unlock_irqrestore(&thi->t_lock, flags);
476 wait_for_completion(&thi->stop);
479 int conn_lowest_minor(struct drbd_connection *connection)
481 struct drbd_peer_device *peer_device;
482 int vnr = 0, minor = -1;
485 peer_device = idr_get_next(&connection->peer_devices, &vnr);
487 minor = device_to_minor(peer_device->device);
495 * drbd_calc_cpu_mask() - Generate CPU masks, spread over all CPUs
497 * Forces all threads of a resource onto the same CPU. This is beneficial for
498 * DRBD's performance. May be overwritten by user's configuration.
500 static void drbd_calc_cpu_mask(cpumask_var_t *cpu_mask)
502 unsigned int *resources_per_cpu, min_index = ~0;
504 resources_per_cpu = kcalloc(nr_cpu_ids, sizeof(*resources_per_cpu),
506 if (resources_per_cpu) {
507 struct drbd_resource *resource;
508 unsigned int cpu, min = ~0;
511 for_each_resource_rcu(resource, &drbd_resources) {
512 for_each_cpu(cpu, resource->cpu_mask)
513 resources_per_cpu[cpu]++;
516 for_each_online_cpu(cpu) {
517 if (resources_per_cpu[cpu] < min) {
518 min = resources_per_cpu[cpu];
522 kfree(resources_per_cpu);
524 if (min_index == ~0) {
525 cpumask_setall(*cpu_mask);
528 cpumask_set_cpu(min_index, *cpu_mask);
532 * drbd_thread_current_set_cpu() - modifies the cpu mask of the _current_ thread
533 * @device: DRBD device.
534 * @thi: drbd_thread object
536 * call in the "main loop" of _all_ threads, no need for any mutex, current won't die
539 void drbd_thread_current_set_cpu(struct drbd_thread *thi)
541 struct drbd_resource *resource = thi->resource;
542 struct task_struct *p = current;
544 if (!thi->reset_cpu_mask)
546 thi->reset_cpu_mask = 0;
547 set_cpus_allowed_ptr(p, resource->cpu_mask);
550 #define drbd_calc_cpu_mask(A) ({})
554 * drbd_header_size - size of a packet header
556 * The header size is a multiple of 8, so any payload following the header is
557 * word aligned on 64-bit architectures. (The bitmap send and receive code
560 unsigned int drbd_header_size(struct drbd_connection *connection)
562 if (connection->agreed_pro_version >= 100) {
563 BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header100), 8));
564 return sizeof(struct p_header100);
566 BUILD_BUG_ON(sizeof(struct p_header80) !=
567 sizeof(struct p_header95));
568 BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header80), 8));
569 return sizeof(struct p_header80);
573 static unsigned int prepare_header80(struct p_header80 *h, enum drbd_packet cmd, int size)
575 h->magic = cpu_to_be32(DRBD_MAGIC);
576 h->command = cpu_to_be16(cmd);
577 h->length = cpu_to_be16(size);
578 return sizeof(struct p_header80);
581 static unsigned int prepare_header95(struct p_header95 *h, enum drbd_packet cmd, int size)
583 h->magic = cpu_to_be16(DRBD_MAGIC_BIG);
584 h->command = cpu_to_be16(cmd);
585 h->length = cpu_to_be32(size);
586 return sizeof(struct p_header95);
589 static unsigned int prepare_header100(struct p_header100 *h, enum drbd_packet cmd,
592 h->magic = cpu_to_be32(DRBD_MAGIC_100);
593 h->volume = cpu_to_be16(vnr);
594 h->command = cpu_to_be16(cmd);
595 h->length = cpu_to_be32(size);
597 return sizeof(struct p_header100);
600 static unsigned int prepare_header(struct drbd_connection *connection, int vnr,
601 void *buffer, enum drbd_packet cmd, int size)
603 if (connection->agreed_pro_version >= 100)
604 return prepare_header100(buffer, cmd, size, vnr);
605 else if (connection->agreed_pro_version >= 95 &&
606 size > DRBD_MAX_SIZE_H80_PACKET)
607 return prepare_header95(buffer, cmd, size);
609 return prepare_header80(buffer, cmd, size);
612 static void *__conn_prepare_command(struct drbd_connection *connection,
613 struct drbd_socket *sock)
617 return sock->sbuf + drbd_header_size(connection);
620 void *conn_prepare_command(struct drbd_connection *connection, struct drbd_socket *sock)
624 mutex_lock(&sock->mutex);
625 p = __conn_prepare_command(connection, sock);
627 mutex_unlock(&sock->mutex);
632 void *drbd_prepare_command(struct drbd_peer_device *peer_device, struct drbd_socket *sock)
634 return conn_prepare_command(peer_device->connection, sock);
637 static int __send_command(struct drbd_connection *connection, int vnr,
638 struct drbd_socket *sock, enum drbd_packet cmd,
639 unsigned int header_size, void *data,
646 * Called with @data == NULL and the size of the data blocks in @size
647 * for commands that send data blocks. For those commands, omit the
648 * MSG_MORE flag: this will increase the likelihood that data blocks
649 * which are page aligned on the sender will end up page aligned on the
652 msg_flags = data ? MSG_MORE : 0;
654 header_size += prepare_header(connection, vnr, sock->sbuf, cmd,
656 err = drbd_send_all(connection, sock->socket, sock->sbuf, header_size,
659 err = drbd_send_all(connection, sock->socket, data, size, 0);
660 /* DRBD protocol "pings" are latency critical.
661 * This is supposed to trigger tcp_push_pending_frames() */
662 if (!err && (cmd == P_PING || cmd == P_PING_ACK))
663 drbd_tcp_nodelay(sock->socket);
668 static int __conn_send_command(struct drbd_connection *connection, struct drbd_socket *sock,
669 enum drbd_packet cmd, unsigned int header_size,
670 void *data, unsigned int size)
672 return __send_command(connection, 0, sock, cmd, header_size, data, size);
675 int conn_send_command(struct drbd_connection *connection, struct drbd_socket *sock,
676 enum drbd_packet cmd, unsigned int header_size,
677 void *data, unsigned int size)
681 err = __conn_send_command(connection, sock, cmd, header_size, data, size);
682 mutex_unlock(&sock->mutex);
686 int drbd_send_command(struct drbd_peer_device *peer_device, struct drbd_socket *sock,
687 enum drbd_packet cmd, unsigned int header_size,
688 void *data, unsigned int size)
692 err = __send_command(peer_device->connection, peer_device->device->vnr,
693 sock, cmd, header_size, data, size);
694 mutex_unlock(&sock->mutex);
698 int drbd_send_ping(struct drbd_connection *connection)
700 struct drbd_socket *sock;
702 sock = &connection->meta;
703 if (!conn_prepare_command(connection, sock))
705 return conn_send_command(connection, sock, P_PING, 0, NULL, 0);
708 int drbd_send_ping_ack(struct drbd_connection *connection)
710 struct drbd_socket *sock;
712 sock = &connection->meta;
713 if (!conn_prepare_command(connection, sock))
715 return conn_send_command(connection, sock, P_PING_ACK, 0, NULL, 0);
718 int drbd_send_sync_param(struct drbd_peer_device *peer_device)
720 struct drbd_socket *sock;
721 struct p_rs_param_95 *p;
723 const int apv = peer_device->connection->agreed_pro_version;
724 enum drbd_packet cmd;
726 struct disk_conf *dc;
728 sock = &peer_device->connection->data;
729 p = drbd_prepare_command(peer_device, sock);
734 nc = rcu_dereference(peer_device->connection->net_conf);
736 size = apv <= 87 ? sizeof(struct p_rs_param)
737 : apv == 88 ? sizeof(struct p_rs_param)
738 + strlen(nc->verify_alg) + 1
739 : apv <= 94 ? sizeof(struct p_rs_param_89)
740 : /* apv >= 95 */ sizeof(struct p_rs_param_95);
742 cmd = apv >= 89 ? P_SYNC_PARAM89 : P_SYNC_PARAM;
744 /* initialize verify_alg and csums_alg */
745 memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX);
747 if (get_ldev(peer_device->device)) {
748 dc = rcu_dereference(peer_device->device->ldev->disk_conf);
749 p->resync_rate = cpu_to_be32(dc->resync_rate);
750 p->c_plan_ahead = cpu_to_be32(dc->c_plan_ahead);
751 p->c_delay_target = cpu_to_be32(dc->c_delay_target);
752 p->c_fill_target = cpu_to_be32(dc->c_fill_target);
753 p->c_max_rate = cpu_to_be32(dc->c_max_rate);
754 put_ldev(peer_device->device);
756 p->resync_rate = cpu_to_be32(DRBD_RESYNC_RATE_DEF);
757 p->c_plan_ahead = cpu_to_be32(DRBD_C_PLAN_AHEAD_DEF);
758 p->c_delay_target = cpu_to_be32(DRBD_C_DELAY_TARGET_DEF);
759 p->c_fill_target = cpu_to_be32(DRBD_C_FILL_TARGET_DEF);
760 p->c_max_rate = cpu_to_be32(DRBD_C_MAX_RATE_DEF);
764 strcpy(p->verify_alg, nc->verify_alg);
766 strcpy(p->csums_alg, nc->csums_alg);
769 return drbd_send_command(peer_device, sock, cmd, size, NULL, 0);
772 int __drbd_send_protocol(struct drbd_connection *connection, enum drbd_packet cmd)
774 struct drbd_socket *sock;
775 struct p_protocol *p;
779 sock = &connection->data;
780 p = __conn_prepare_command(connection, sock);
785 nc = rcu_dereference(connection->net_conf);
787 if (nc->tentative && connection->agreed_pro_version < 92) {
789 mutex_unlock(&sock->mutex);
790 drbd_err(connection, "--dry-run is not supported by peer");
795 if (connection->agreed_pro_version >= 87)
796 size += strlen(nc->integrity_alg) + 1;
798 p->protocol = cpu_to_be32(nc->wire_protocol);
799 p->after_sb_0p = cpu_to_be32(nc->after_sb_0p);
800 p->after_sb_1p = cpu_to_be32(nc->after_sb_1p);
801 p->after_sb_2p = cpu_to_be32(nc->after_sb_2p);
802 p->two_primaries = cpu_to_be32(nc->two_primaries);
804 if (nc->discard_my_data)
805 cf |= CF_DISCARD_MY_DATA;
808 p->conn_flags = cpu_to_be32(cf);
810 if (connection->agreed_pro_version >= 87)
811 strcpy(p->integrity_alg, nc->integrity_alg);
814 return __conn_send_command(connection, sock, cmd, size, NULL, 0);
817 int drbd_send_protocol(struct drbd_connection *connection)
821 mutex_lock(&connection->data.mutex);
822 err = __drbd_send_protocol(connection, P_PROTOCOL);
823 mutex_unlock(&connection->data.mutex);
828 static int _drbd_send_uuids(struct drbd_peer_device *peer_device, u64 uuid_flags)
830 struct drbd_device *device = peer_device->device;
831 struct drbd_socket *sock;
835 if (!get_ldev_if_state(device, D_NEGOTIATING))
838 sock = &peer_device->connection->data;
839 p = drbd_prepare_command(peer_device, sock);
844 spin_lock_irq(&device->ldev->md.uuid_lock);
845 for (i = UI_CURRENT; i < UI_SIZE; i++)
846 p->uuid[i] = cpu_to_be64(device->ldev->md.uuid[i]);
847 spin_unlock_irq(&device->ldev->md.uuid_lock);
849 device->comm_bm_set = drbd_bm_total_weight(device);
850 p->uuid[UI_SIZE] = cpu_to_be64(device->comm_bm_set);
852 uuid_flags |= rcu_dereference(peer_device->connection->net_conf)->discard_my_data ? 1 : 0;
854 uuid_flags |= test_bit(CRASHED_PRIMARY, &device->flags) ? 2 : 0;
855 uuid_flags |= device->new_state_tmp.disk == D_INCONSISTENT ? 4 : 0;
856 p->uuid[UI_FLAGS] = cpu_to_be64(uuid_flags);
859 return drbd_send_command(peer_device, sock, P_UUIDS, sizeof(*p), NULL, 0);
862 int drbd_send_uuids(struct drbd_peer_device *peer_device)
864 return _drbd_send_uuids(peer_device, 0);
867 int drbd_send_uuids_skip_initial_sync(struct drbd_peer_device *peer_device)
869 return _drbd_send_uuids(peer_device, 8);
872 void drbd_print_uuids(struct drbd_device *device, const char *text)
874 if (get_ldev_if_state(device, D_NEGOTIATING)) {
875 u64 *uuid = device->ldev->md.uuid;
876 drbd_info(device, "%s %016llX:%016llX:%016llX:%016llX\n",
878 (unsigned long long)uuid[UI_CURRENT],
879 (unsigned long long)uuid[UI_BITMAP],
880 (unsigned long long)uuid[UI_HISTORY_START],
881 (unsigned long long)uuid[UI_HISTORY_END]);
884 drbd_info(device, "%s effective data uuid: %016llX\n",
886 (unsigned long long)device->ed_uuid);
890 void drbd_gen_and_send_sync_uuid(struct drbd_peer_device *peer_device)
892 struct drbd_device *device = peer_device->device;
893 struct drbd_socket *sock;
897 D_ASSERT(device, device->state.disk == D_UP_TO_DATE);
899 uuid = device->ldev->md.uuid[UI_BITMAP];
900 if (uuid && uuid != UUID_JUST_CREATED)
901 uuid = uuid + UUID_NEW_BM_OFFSET;
903 get_random_bytes(&uuid, sizeof(u64));
904 drbd_uuid_set(device, UI_BITMAP, uuid);
905 drbd_print_uuids(device, "updated sync UUID");
906 drbd_md_sync(device);
908 sock = &peer_device->connection->data;
909 p = drbd_prepare_command(peer_device, sock);
911 p->uuid = cpu_to_be64(uuid);
912 drbd_send_command(peer_device, sock, P_SYNC_UUID, sizeof(*p), NULL, 0);
916 /* communicated if (agreed_features & DRBD_FF_WSAME) */
918 assign_p_sizes_qlim(struct drbd_device *device, struct p_sizes *p,
919 struct request_queue *q)
922 p->qlim->physical_block_size = cpu_to_be32(queue_physical_block_size(q));
923 p->qlim->logical_block_size = cpu_to_be32(queue_logical_block_size(q));
924 p->qlim->alignment_offset = cpu_to_be32(queue_alignment_offset(q));
925 p->qlim->io_min = cpu_to_be32(queue_io_min(q));
926 p->qlim->io_opt = cpu_to_be32(queue_io_opt(q));
927 p->qlim->discard_enabled = blk_queue_discard(q);
928 p->qlim->write_same_capable = !!q->limits.max_write_same_sectors;
930 q = device->rq_queue;
931 p->qlim->physical_block_size = cpu_to_be32(queue_physical_block_size(q));
932 p->qlim->logical_block_size = cpu_to_be32(queue_logical_block_size(q));
933 p->qlim->alignment_offset = 0;
934 p->qlim->io_min = cpu_to_be32(queue_io_min(q));
935 p->qlim->io_opt = cpu_to_be32(queue_io_opt(q));
936 p->qlim->discard_enabled = 0;
937 p->qlim->write_same_capable = 0;
941 int drbd_send_sizes(struct drbd_peer_device *peer_device, int trigger_reply, enum dds_flags flags)
943 struct drbd_device *device = peer_device->device;
944 struct drbd_socket *sock;
946 sector_t d_size, u_size;
948 unsigned int max_bio_size;
949 unsigned int packet_size;
951 sock = &peer_device->connection->data;
952 p = drbd_prepare_command(peer_device, sock);
956 packet_size = sizeof(*p);
957 if (peer_device->connection->agreed_features & DRBD_FF_WSAME)
958 packet_size += sizeof(p->qlim[0]);
960 memset(p, 0, packet_size);
961 if (get_ldev_if_state(device, D_NEGOTIATING)) {
962 struct request_queue *q = bdev_get_queue(device->ldev->backing_bdev);
963 d_size = drbd_get_max_capacity(device->ldev);
965 u_size = rcu_dereference(device->ldev->disk_conf)->disk_size;
967 q_order_type = drbd_queue_order_type(device);
968 max_bio_size = queue_max_hw_sectors(q) << 9;
969 max_bio_size = min(max_bio_size, DRBD_MAX_BIO_SIZE);
970 assign_p_sizes_qlim(device, p, q);
975 q_order_type = QUEUE_ORDERED_NONE;
976 max_bio_size = DRBD_MAX_BIO_SIZE; /* ... multiple BIOs per peer_request */
977 assign_p_sizes_qlim(device, p, NULL);
980 if (peer_device->connection->agreed_pro_version <= 94)
981 max_bio_size = min(max_bio_size, DRBD_MAX_SIZE_H80_PACKET);
982 else if (peer_device->connection->agreed_pro_version < 100)
983 max_bio_size = min(max_bio_size, DRBD_MAX_BIO_SIZE_P95);
985 p->d_size = cpu_to_be64(d_size);
986 p->u_size = cpu_to_be64(u_size);
987 p->c_size = cpu_to_be64(trigger_reply ? 0 : drbd_get_capacity(device->this_bdev));
988 p->max_bio_size = cpu_to_be32(max_bio_size);
989 p->queue_order_type = cpu_to_be16(q_order_type);
990 p->dds_flags = cpu_to_be16(flags);
992 return drbd_send_command(peer_device, sock, P_SIZES, packet_size, NULL, 0);
996 * drbd_send_current_state() - Sends the drbd state to the peer
997 * @peer_device: DRBD peer device.
999 int drbd_send_current_state(struct drbd_peer_device *peer_device)
1001 struct drbd_socket *sock;
1004 sock = &peer_device->connection->data;
1005 p = drbd_prepare_command(peer_device, sock);
1008 p->state = cpu_to_be32(peer_device->device->state.i); /* Within the send mutex */
1009 return drbd_send_command(peer_device, sock, P_STATE, sizeof(*p), NULL, 0);
1013 * drbd_send_state() - After a state change, sends the new state to the peer
1014 * @peer_device: DRBD peer device.
1015 * @state: the state to send, not necessarily the current state.
1017 * Each state change queues an "after_state_ch" work, which will eventually
1018 * send the resulting new state to the peer. If more state changes happen
1019 * between queuing and processing of the after_state_ch work, we still
1020 * want to send each intermediary state in the order it occurred.
1022 int drbd_send_state(struct drbd_peer_device *peer_device, union drbd_state state)
1024 struct drbd_socket *sock;
1027 sock = &peer_device->connection->data;
1028 p = drbd_prepare_command(peer_device, sock);
1031 p->state = cpu_to_be32(state.i); /* Within the send mutex */
1032 return drbd_send_command(peer_device, sock, P_STATE, sizeof(*p), NULL, 0);
1035 int drbd_send_state_req(struct drbd_peer_device *peer_device, union drbd_state mask, union drbd_state val)
1037 struct drbd_socket *sock;
1038 struct p_req_state *p;
1040 sock = &peer_device->connection->data;
1041 p = drbd_prepare_command(peer_device, sock);
1044 p->mask = cpu_to_be32(mask.i);
1045 p->val = cpu_to_be32(val.i);
1046 return drbd_send_command(peer_device, sock, P_STATE_CHG_REQ, sizeof(*p), NULL, 0);
1049 int conn_send_state_req(struct drbd_connection *connection, union drbd_state mask, union drbd_state val)
1051 enum drbd_packet cmd;
1052 struct drbd_socket *sock;
1053 struct p_req_state *p;
1055 cmd = connection->agreed_pro_version < 100 ? P_STATE_CHG_REQ : P_CONN_ST_CHG_REQ;
1056 sock = &connection->data;
1057 p = conn_prepare_command(connection, sock);
1060 p->mask = cpu_to_be32(mask.i);
1061 p->val = cpu_to_be32(val.i);
1062 return conn_send_command(connection, sock, cmd, sizeof(*p), NULL, 0);
1065 void drbd_send_sr_reply(struct drbd_peer_device *peer_device, enum drbd_state_rv retcode)
1067 struct drbd_socket *sock;
1068 struct p_req_state_reply *p;
1070 sock = &peer_device->connection->meta;
1071 p = drbd_prepare_command(peer_device, sock);
1073 p->retcode = cpu_to_be32(retcode);
1074 drbd_send_command(peer_device, sock, P_STATE_CHG_REPLY, sizeof(*p), NULL, 0);
1078 void conn_send_sr_reply(struct drbd_connection *connection, enum drbd_state_rv retcode)
1080 struct drbd_socket *sock;
1081 struct p_req_state_reply *p;
1082 enum drbd_packet cmd = connection->agreed_pro_version < 100 ? P_STATE_CHG_REPLY : P_CONN_ST_CHG_REPLY;
1084 sock = &connection->meta;
1085 p = conn_prepare_command(connection, sock);
1087 p->retcode = cpu_to_be32(retcode);
1088 conn_send_command(connection, sock, cmd, sizeof(*p), NULL, 0);
1092 static void dcbp_set_code(struct p_compressed_bm *p, enum drbd_bitmap_code code)
1094 BUG_ON(code & ~0xf);
1095 p->encoding = (p->encoding & ~0xf) | code;
1098 static void dcbp_set_start(struct p_compressed_bm *p, int set)
1100 p->encoding = (p->encoding & ~0x80) | (set ? 0x80 : 0);
1103 static void dcbp_set_pad_bits(struct p_compressed_bm *p, int n)
1106 p->encoding = (p->encoding & (~0x7 << 4)) | (n << 4);
1109 static int fill_bitmap_rle_bits(struct drbd_device *device,
1110 struct p_compressed_bm *p,
1112 struct bm_xfer_ctx *c)
1114 struct bitstream bs;
1115 unsigned long plain_bits;
1122 /* may we use this feature? */
1124 use_rle = rcu_dereference(first_peer_device(device)->connection->net_conf)->use_rle;
1126 if (!use_rle || first_peer_device(device)->connection->agreed_pro_version < 90)
1129 if (c->bit_offset >= c->bm_bits)
1130 return 0; /* nothing to do. */
1132 /* use at most thus many bytes */
1133 bitstream_init(&bs, p->code, size, 0);
1134 memset(p->code, 0, size);
1135 /* plain bits covered in this code string */
1138 /* p->encoding & 0x80 stores whether the first run length is set.
1139 * bit offset is implicit.
1140 * start with toggle == 2 to be able to tell the first iteration */
1143 /* see how much plain bits we can stuff into one packet
1144 * using RLE and VLI. */
1146 tmp = (toggle == 0) ? _drbd_bm_find_next_zero(device, c->bit_offset)
1147 : _drbd_bm_find_next(device, c->bit_offset);
1150 rl = tmp - c->bit_offset;
1152 if (toggle == 2) { /* first iteration */
1154 /* the first checked bit was set,
1155 * store start value, */
1156 dcbp_set_start(p, 1);
1157 /* but skip encoding of zero run length */
1161 dcbp_set_start(p, 0);
1164 /* paranoia: catch zero runlength.
1165 * can only happen if bitmap is modified while we scan it. */
1167 drbd_err(device, "unexpected zero runlength while encoding bitmap "
1168 "t:%u bo:%lu\n", toggle, c->bit_offset);
1172 bits = vli_encode_bits(&bs, rl);
1173 if (bits == -ENOBUFS) /* buffer full */
1176 drbd_err(device, "error while encoding bitmap: %d\n", bits);
1182 c->bit_offset = tmp;
1183 } while (c->bit_offset < c->bm_bits);
1185 len = bs.cur.b - p->code + !!bs.cur.bit;
1187 if (plain_bits < (len << 3)) {
1188 /* incompressible with this method.
1189 * we need to rewind both word and bit position. */
1190 c->bit_offset -= plain_bits;
1191 bm_xfer_ctx_bit_to_word_offset(c);
1192 c->bit_offset = c->word_offset * BITS_PER_LONG;
1196 /* RLE + VLI was able to compress it just fine.
1197 * update c->word_offset. */
1198 bm_xfer_ctx_bit_to_word_offset(c);
1200 /* store pad_bits */
1201 dcbp_set_pad_bits(p, (8 - bs.cur.bit) & 0x7);
1207 * send_bitmap_rle_or_plain
1209 * Return 0 when done, 1 when another iteration is needed, and a negative error
1210 * code upon failure.
1213 send_bitmap_rle_or_plain(struct drbd_device *device, struct bm_xfer_ctx *c)
1215 struct drbd_socket *sock = &first_peer_device(device)->connection->data;
1216 unsigned int header_size = drbd_header_size(first_peer_device(device)->connection);
1217 struct p_compressed_bm *p = sock->sbuf + header_size;
1220 len = fill_bitmap_rle_bits(device, p,
1221 DRBD_SOCKET_BUFFER_SIZE - header_size - sizeof(*p), c);
1226 dcbp_set_code(p, RLE_VLI_Bits);
1227 err = __send_command(first_peer_device(device)->connection, device->vnr, sock,
1228 P_COMPRESSED_BITMAP, sizeof(*p) + len,
1231 c->bytes[0] += header_size + sizeof(*p) + len;
1233 if (c->bit_offset >= c->bm_bits)
1236 /* was not compressible.
1237 * send a buffer full of plain text bits instead. */
1238 unsigned int data_size;
1239 unsigned long num_words;
1240 unsigned long *p = sock->sbuf + header_size;
1242 data_size = DRBD_SOCKET_BUFFER_SIZE - header_size;
1243 num_words = min_t(size_t, data_size / sizeof(*p),
1244 c->bm_words - c->word_offset);
1245 len = num_words * sizeof(*p);
1247 drbd_bm_get_lel(device, c->word_offset, num_words, p);
1248 err = __send_command(first_peer_device(device)->connection, device->vnr, sock, P_BITMAP, len, NULL, 0);
1249 c->word_offset += num_words;
1250 c->bit_offset = c->word_offset * BITS_PER_LONG;
1253 c->bytes[1] += header_size + len;
1255 if (c->bit_offset > c->bm_bits)
1256 c->bit_offset = c->bm_bits;
1260 INFO_bm_xfer_stats(device, "send", c);
1268 /* See the comment at receive_bitmap() */
1269 static int _drbd_send_bitmap(struct drbd_device *device)
1271 struct bm_xfer_ctx c;
1274 if (!expect(device->bitmap))
1277 if (get_ldev(device)) {
1278 if (drbd_md_test_flag(device->ldev, MDF_FULL_SYNC)) {
1279 drbd_info(device, "Writing the whole bitmap, MDF_FullSync was set.\n");
1280 drbd_bm_set_all(device);
1281 if (drbd_bm_write(device)) {
1282 /* write_bm did fail! Leave full sync flag set in Meta P_DATA
1283 * but otherwise process as per normal - need to tell other
1284 * side that a full resync is required! */
1285 drbd_err(device, "Failed to write bitmap to disk!\n");
1287 drbd_md_clear_flag(device, MDF_FULL_SYNC);
1288 drbd_md_sync(device);
1294 c = (struct bm_xfer_ctx) {
1295 .bm_bits = drbd_bm_bits(device),
1296 .bm_words = drbd_bm_words(device),
1300 err = send_bitmap_rle_or_plain(device, &c);
1306 int drbd_send_bitmap(struct drbd_device *device)
1308 struct drbd_socket *sock = &first_peer_device(device)->connection->data;
1311 mutex_lock(&sock->mutex);
1313 err = !_drbd_send_bitmap(device);
1314 mutex_unlock(&sock->mutex);
1318 void drbd_send_b_ack(struct drbd_connection *connection, u32 barrier_nr, u32 set_size)
1320 struct drbd_socket *sock;
1321 struct p_barrier_ack *p;
1323 if (connection->cstate < C_WF_REPORT_PARAMS)
1326 sock = &connection->meta;
1327 p = conn_prepare_command(connection, sock);
1330 p->barrier = barrier_nr;
1331 p->set_size = cpu_to_be32(set_size);
1332 conn_send_command(connection, sock, P_BARRIER_ACK, sizeof(*p), NULL, 0);
1336 * _drbd_send_ack() - Sends an ack packet
1337 * @device: DRBD device.
1338 * @cmd: Packet command code.
1339 * @sector: sector, needs to be in big endian byte order
1340 * @blksize: size in byte, needs to be in big endian byte order
1341 * @block_id: Id, big endian byte order
1343 static int _drbd_send_ack(struct drbd_peer_device *peer_device, enum drbd_packet cmd,
1344 u64 sector, u32 blksize, u64 block_id)
1346 struct drbd_socket *sock;
1347 struct p_block_ack *p;
1349 if (peer_device->device->state.conn < C_CONNECTED)
1352 sock = &peer_device->connection->meta;
1353 p = drbd_prepare_command(peer_device, sock);
1357 p->block_id = block_id;
1358 p->blksize = blksize;
1359 p->seq_num = cpu_to_be32(atomic_inc_return(&peer_device->device->packet_seq));
1360 return drbd_send_command(peer_device, sock, cmd, sizeof(*p), NULL, 0);
1363 /* dp->sector and dp->block_id already/still in network byte order,
1364 * data_size is payload size according to dp->head,
1365 * and may need to be corrected for digest size. */
1366 void drbd_send_ack_dp(struct drbd_peer_device *peer_device, enum drbd_packet cmd,
1367 struct p_data *dp, int data_size)
1369 if (peer_device->connection->peer_integrity_tfm)
1370 data_size -= crypto_shash_digestsize(peer_device->connection->peer_integrity_tfm);
1371 _drbd_send_ack(peer_device, cmd, dp->sector, cpu_to_be32(data_size),
1375 void drbd_send_ack_rp(struct drbd_peer_device *peer_device, enum drbd_packet cmd,
1376 struct p_block_req *rp)
1378 _drbd_send_ack(peer_device, cmd, rp->sector, rp->blksize, rp->block_id);
1382 * drbd_send_ack() - Sends an ack packet
1383 * @device: DRBD device
1384 * @cmd: packet command code
1385 * @peer_req: peer request
1387 int drbd_send_ack(struct drbd_peer_device *peer_device, enum drbd_packet cmd,
1388 struct drbd_peer_request *peer_req)
1390 return _drbd_send_ack(peer_device, cmd,
1391 cpu_to_be64(peer_req->i.sector),
1392 cpu_to_be32(peer_req->i.size),
1393 peer_req->block_id);
1396 /* This function misuses the block_id field to signal if the blocks
1397 * are is sync or not. */
1398 int drbd_send_ack_ex(struct drbd_peer_device *peer_device, enum drbd_packet cmd,
1399 sector_t sector, int blksize, u64 block_id)
1401 return _drbd_send_ack(peer_device, cmd,
1402 cpu_to_be64(sector),
1403 cpu_to_be32(blksize),
1404 cpu_to_be64(block_id));
1407 int drbd_send_rs_deallocated(struct drbd_peer_device *peer_device,
1408 struct drbd_peer_request *peer_req)
1410 struct drbd_socket *sock;
1411 struct p_block_desc *p;
1413 sock = &peer_device->connection->data;
1414 p = drbd_prepare_command(peer_device, sock);
1417 p->sector = cpu_to_be64(peer_req->i.sector);
1418 p->blksize = cpu_to_be32(peer_req->i.size);
1420 return drbd_send_command(peer_device, sock, P_RS_DEALLOCATED, sizeof(*p), NULL, 0);
1423 int drbd_send_drequest(struct drbd_peer_device *peer_device, int cmd,
1424 sector_t sector, int size, u64 block_id)
1426 struct drbd_socket *sock;
1427 struct p_block_req *p;
1429 sock = &peer_device->connection->data;
1430 p = drbd_prepare_command(peer_device, sock);
1433 p->sector = cpu_to_be64(sector);
1434 p->block_id = block_id;
1435 p->blksize = cpu_to_be32(size);
1436 return drbd_send_command(peer_device, sock, cmd, sizeof(*p), NULL, 0);
1439 int drbd_send_drequest_csum(struct drbd_peer_device *peer_device, sector_t sector, int size,
1440 void *digest, int digest_size, enum drbd_packet cmd)
1442 struct drbd_socket *sock;
1443 struct p_block_req *p;
1445 /* FIXME: Put the digest into the preallocated socket buffer. */
1447 sock = &peer_device->connection->data;
1448 p = drbd_prepare_command(peer_device, sock);
1451 p->sector = cpu_to_be64(sector);
1452 p->block_id = ID_SYNCER /* unused */;
1453 p->blksize = cpu_to_be32(size);
1454 return drbd_send_command(peer_device, sock, cmd, sizeof(*p), digest, digest_size);
1457 int drbd_send_ov_request(struct drbd_peer_device *peer_device, sector_t sector, int size)
1459 struct drbd_socket *sock;
1460 struct p_block_req *p;
1462 sock = &peer_device->connection->data;
1463 p = drbd_prepare_command(peer_device, sock);
1466 p->sector = cpu_to_be64(sector);
1467 p->block_id = ID_SYNCER /* unused */;
1468 p->blksize = cpu_to_be32(size);
1469 return drbd_send_command(peer_device, sock, P_OV_REQUEST, sizeof(*p), NULL, 0);
1472 /* called on sndtimeo
1473 * returns false if we should retry,
1474 * true if we think connection is dead
1476 static int we_should_drop_the_connection(struct drbd_connection *connection, struct socket *sock)
1479 /* long elapsed = (long)(jiffies - device->last_received); */
1481 drop_it = connection->meta.socket == sock
1482 || !connection->ack_receiver.task
1483 || get_t_state(&connection->ack_receiver) != RUNNING
1484 || connection->cstate < C_WF_REPORT_PARAMS;
1489 drop_it = !--connection->ko_count;
1491 drbd_err(connection, "[%s/%d] sock_sendmsg time expired, ko = %u\n",
1492 current->comm, current->pid, connection->ko_count);
1493 request_ping(connection);
1496 return drop_it; /* && (device->state == R_PRIMARY) */;
1499 static void drbd_update_congested(struct drbd_connection *connection)
1501 struct sock *sk = connection->data.socket->sk;
1502 if (sk->sk_wmem_queued > sk->sk_sndbuf * 4 / 5)
1503 set_bit(NET_CONGESTED, &connection->flags);
1506 /* The idea of sendpage seems to be to put some kind of reference
1507 * to the page into the skb, and to hand it over to the NIC. In
1508 * this process get_page() gets called.
1510 * As soon as the page was really sent over the network put_page()
1511 * gets called by some part of the network layer. [ NIC driver? ]
1513 * [ get_page() / put_page() increment/decrement the count. If count
1514 * reaches 0 the page will be freed. ]
1516 * This works nicely with pages from FSs.
1517 * But this means that in protocol A we might signal IO completion too early!
1519 * In order not to corrupt data during a resync we must make sure
1520 * that we do not reuse our own buffer pages (EEs) to early, therefore
1521 * we have the net_ee list.
1523 * XFS seems to have problems, still, it submits pages with page_count == 0!
1524 * As a workaround, we disable sendpage on pages
1525 * with page_count == 0 or PageSlab.
1527 static int _drbd_no_send_page(struct drbd_peer_device *peer_device, struct page *page,
1528 int offset, size_t size, unsigned msg_flags)
1530 struct socket *socket;
1534 socket = peer_device->connection->data.socket;
1535 addr = kmap(page) + offset;
1536 err = drbd_send_all(peer_device->connection, socket, addr, size, msg_flags);
1539 peer_device->device->send_cnt += size >> 9;
1543 static int _drbd_send_page(struct drbd_peer_device *peer_device, struct page *page,
1544 int offset, size_t size, unsigned msg_flags)
1546 struct socket *socket = peer_device->connection->data.socket;
1550 /* e.g. XFS meta- & log-data is in slab pages, which have a
1551 * page_count of 0 and/or have PageSlab() set.
1552 * we cannot use send_page for those, as that does get_page();
1553 * put_page(); and would cause either a VM_BUG directly, or
1554 * __page_cache_release a page that would actually still be referenced
1555 * by someone, leading to some obscure delayed Oops somewhere else. */
1556 if (drbd_disable_sendpage || (page_count(page) < 1) || PageSlab(page))
1557 return _drbd_no_send_page(peer_device, page, offset, size, msg_flags);
1559 msg_flags |= MSG_NOSIGNAL;
1560 drbd_update_congested(peer_device->connection);
1564 sent = socket->ops->sendpage(socket, page, offset, len, msg_flags);
1566 if (sent == -EAGAIN) {
1567 if (we_should_drop_the_connection(peer_device->connection, socket))
1571 drbd_warn(peer_device->device, "%s: size=%d len=%d sent=%d\n",
1572 __func__, (int)size, len, sent);
1579 } while (len > 0 /* THINK && device->cstate >= C_CONNECTED*/);
1580 clear_bit(NET_CONGESTED, &peer_device->connection->flags);
1584 peer_device->device->send_cnt += size >> 9;
1589 static int _drbd_send_bio(struct drbd_peer_device *peer_device, struct bio *bio)
1591 struct bio_vec bvec;
1592 struct bvec_iter iter;
1594 /* hint all but last page with MSG_MORE */
1595 bio_for_each_segment(bvec, bio, iter) {
1598 err = _drbd_no_send_page(peer_device, bvec.bv_page,
1599 bvec.bv_offset, bvec.bv_len,
1600 bio_iter_last(bvec, iter)
1604 /* REQ_OP_WRITE_SAME has only one segment */
1605 if (bio_op(bio) == REQ_OP_WRITE_SAME)
1611 static int _drbd_send_zc_bio(struct drbd_peer_device *peer_device, struct bio *bio)
1613 struct bio_vec bvec;
1614 struct bvec_iter iter;
1616 /* hint all but last page with MSG_MORE */
1617 bio_for_each_segment(bvec, bio, iter) {
1620 err = _drbd_send_page(peer_device, bvec.bv_page,
1621 bvec.bv_offset, bvec.bv_len,
1622 bio_iter_last(bvec, iter) ? 0 : MSG_MORE);
1625 /* REQ_OP_WRITE_SAME has only one segment */
1626 if (bio_op(bio) == REQ_OP_WRITE_SAME)
1632 static int _drbd_send_zc_ee(struct drbd_peer_device *peer_device,
1633 struct drbd_peer_request *peer_req)
1635 struct page *page = peer_req->pages;
1636 unsigned len = peer_req->i.size;
1639 /* hint all but last page with MSG_MORE */
1640 page_chain_for_each(page) {
1641 unsigned l = min_t(unsigned, len, PAGE_SIZE);
1643 err = _drbd_send_page(peer_device, page, 0, l,
1644 page_chain_next(page) ? MSG_MORE : 0);
1652 static u32 bio_flags_to_wire(struct drbd_connection *connection,
1655 if (connection->agreed_pro_version >= 95)
1656 return (bio->bi_opf & REQ_SYNC ? DP_RW_SYNC : 0) |
1657 (bio->bi_opf & REQ_FUA ? DP_FUA : 0) |
1658 (bio->bi_opf & REQ_PREFLUSH ? DP_FLUSH : 0) |
1659 (bio_op(bio) == REQ_OP_WRITE_SAME ? DP_WSAME : 0) |
1660 (bio_op(bio) == REQ_OP_DISCARD ? DP_DISCARD : 0) |
1661 (bio_op(bio) == REQ_OP_WRITE_ZEROES ?
1662 ((connection->agreed_features & DRBD_FF_WZEROES) ?
1663 (DP_ZEROES |(!(bio->bi_opf & REQ_NOUNMAP) ? DP_DISCARD : 0))
1667 return bio->bi_opf & REQ_SYNC ? DP_RW_SYNC : 0;
1670 /* Used to send write or TRIM aka REQ_OP_DISCARD requests
1671 * R_PRIMARY -> Peer (P_DATA, P_TRIM)
1673 int drbd_send_dblock(struct drbd_peer_device *peer_device, struct drbd_request *req)
1675 struct drbd_device *device = peer_device->device;
1676 struct drbd_socket *sock;
1678 struct p_wsame *wsame = NULL;
1680 unsigned int dp_flags = 0;
1684 sock = &peer_device->connection->data;
1685 p = drbd_prepare_command(peer_device, sock);
1686 digest_size = peer_device->connection->integrity_tfm ?
1687 crypto_shash_digestsize(peer_device->connection->integrity_tfm) : 0;
1691 p->sector = cpu_to_be64(req->i.sector);
1692 p->block_id = (unsigned long)req;
1693 p->seq_num = cpu_to_be32(atomic_inc_return(&device->packet_seq));
1694 dp_flags = bio_flags_to_wire(peer_device->connection, req->master_bio);
1695 if (device->state.conn >= C_SYNC_SOURCE &&
1696 device->state.conn <= C_PAUSED_SYNC_T)
1697 dp_flags |= DP_MAY_SET_IN_SYNC;
1698 if (peer_device->connection->agreed_pro_version >= 100) {
1699 if (req->rq_state & RQ_EXP_RECEIVE_ACK)
1700 dp_flags |= DP_SEND_RECEIVE_ACK;
1701 /* During resync, request an explicit write ack,
1702 * even in protocol != C */
1703 if (req->rq_state & RQ_EXP_WRITE_ACK
1704 || (dp_flags & DP_MAY_SET_IN_SYNC))
1705 dp_flags |= DP_SEND_WRITE_ACK;
1707 p->dp_flags = cpu_to_be32(dp_flags);
1709 if (dp_flags & (DP_DISCARD|DP_ZEROES)) {
1710 enum drbd_packet cmd = (dp_flags & DP_ZEROES) ? P_ZEROES : P_TRIM;
1711 struct p_trim *t = (struct p_trim*)p;
1712 t->size = cpu_to_be32(req->i.size);
1713 err = __send_command(peer_device->connection, device->vnr, sock, cmd, sizeof(*t), NULL, 0);
1716 if (dp_flags & DP_WSAME) {
1717 /* this will only work if DRBD_FF_WSAME is set AND the
1718 * handshake agreed that all nodes and backend devices are
1719 * WRITE_SAME capable and agree on logical_block_size */
1720 wsame = (struct p_wsame*)p;
1721 digest_out = wsame + 1;
1722 wsame->size = cpu_to_be32(req->i.size);
1726 /* our digest is still only over the payload.
1727 * TRIM does not carry any payload. */
1729 drbd_csum_bio(peer_device->connection->integrity_tfm, req->master_bio, digest_out);
1732 __send_command(peer_device->connection, device->vnr, sock, P_WSAME,
1733 sizeof(*wsame) + digest_size, NULL,
1734 bio_iovec(req->master_bio).bv_len);
1737 __send_command(peer_device->connection, device->vnr, sock, P_DATA,
1738 sizeof(*p) + digest_size, NULL, req->i.size);
1740 /* For protocol A, we have to memcpy the payload into
1741 * socket buffers, as we may complete right away
1742 * as soon as we handed it over to tcp, at which point the data
1743 * pages may become invalid.
1745 * For data-integrity enabled, we copy it as well, so we can be
1746 * sure that even if the bio pages may still be modified, it
1747 * won't change the data on the wire, thus if the digest checks
1748 * out ok after sending on this side, but does not fit on the
1749 * receiving side, we sure have detected corruption elsewhere.
1751 if (!(req->rq_state & (RQ_EXP_RECEIVE_ACK | RQ_EXP_WRITE_ACK)) || digest_size)
1752 err = _drbd_send_bio(peer_device, req->master_bio);
1754 err = _drbd_send_zc_bio(peer_device, req->master_bio);
1756 /* double check digest, sometimes buffers have been modified in flight. */
1757 if (digest_size > 0 && digest_size <= 64) {
1758 /* 64 byte, 512 bit, is the largest digest size
1759 * currently supported in kernel crypto. */
1760 unsigned char digest[64];
1761 drbd_csum_bio(peer_device->connection->integrity_tfm, req->master_bio, digest);
1762 if (memcmp(p + 1, digest, digest_size)) {
1764 "Digest mismatch, buffer modified by upper layers during write: %llus +%u\n",
1765 (unsigned long long)req->i.sector, req->i.size);
1767 } /* else if (digest_size > 64) {
1768 ... Be noisy about digest too large ...
1772 mutex_unlock(&sock->mutex); /* locked by drbd_prepare_command() */
1777 /* answer packet, used to send data back for read requests:
1778 * Peer -> (diskless) R_PRIMARY (P_DATA_REPLY)
1779 * C_SYNC_SOURCE -> C_SYNC_TARGET (P_RS_DATA_REPLY)
1781 int drbd_send_block(struct drbd_peer_device *peer_device, enum drbd_packet cmd,
1782 struct drbd_peer_request *peer_req)
1784 struct drbd_device *device = peer_device->device;
1785 struct drbd_socket *sock;
1790 sock = &peer_device->connection->data;
1791 p = drbd_prepare_command(peer_device, sock);
1793 digest_size = peer_device->connection->integrity_tfm ?
1794 crypto_shash_digestsize(peer_device->connection->integrity_tfm) : 0;
1798 p->sector = cpu_to_be64(peer_req->i.sector);
1799 p->block_id = peer_req->block_id;
1800 p->seq_num = 0; /* unused */
1803 drbd_csum_ee(peer_device->connection->integrity_tfm, peer_req, p + 1);
1804 err = __send_command(peer_device->connection, device->vnr, sock, cmd, sizeof(*p) + digest_size, NULL, peer_req->i.size);
1806 err = _drbd_send_zc_ee(peer_device, peer_req);
1807 mutex_unlock(&sock->mutex); /* locked by drbd_prepare_command() */
1812 int drbd_send_out_of_sync(struct drbd_peer_device *peer_device, struct drbd_request *req)
1814 struct drbd_socket *sock;
1815 struct p_block_desc *p;
1817 sock = &peer_device->connection->data;
1818 p = drbd_prepare_command(peer_device, sock);
1821 p->sector = cpu_to_be64(req->i.sector);
1822 p->blksize = cpu_to_be32(req->i.size);
1823 return drbd_send_command(peer_device, sock, P_OUT_OF_SYNC, sizeof(*p), NULL, 0);
1827 drbd_send distinguishes two cases:
1829 Packets sent via the data socket "sock"
1830 and packets sent via the meta data socket "msock"
1833 -----------------+-------------------------+------------------------------
1834 timeout conf.timeout / 2 conf.timeout / 2
1835 timeout action send a ping via msock Abort communication
1836 and close all sockets
1840 * you must have down()ed the appropriate [m]sock_mutex elsewhere!
1842 int drbd_send(struct drbd_connection *connection, struct socket *sock,
1843 void *buf, size_t size, unsigned msg_flags)
1845 struct kvec iov = {.iov_base = buf, .iov_len = size};
1846 struct msghdr msg = {.msg_flags = msg_flags | MSG_NOSIGNAL};
1852 /* THINK if (signal_pending) return ... ? */
1854 iov_iter_kvec(&msg.msg_iter, WRITE, &iov, 1, size);
1856 if (sock == connection->data.socket) {
1858 connection->ko_count = rcu_dereference(connection->net_conf)->ko_count;
1860 drbd_update_congested(connection);
1863 rv = sock_sendmsg(sock, &msg);
1864 if (rv == -EAGAIN) {
1865 if (we_should_drop_the_connection(connection, sock))
1871 flush_signals(current);
1877 } while (sent < size);
1879 if (sock == connection->data.socket)
1880 clear_bit(NET_CONGESTED, &connection->flags);
1883 if (rv != -EAGAIN) {
1884 drbd_err(connection, "%s_sendmsg returned %d\n",
1885 sock == connection->meta.socket ? "msock" : "sock",
1887 conn_request_state(connection, NS(conn, C_BROKEN_PIPE), CS_HARD);
1889 conn_request_state(connection, NS(conn, C_TIMEOUT), CS_HARD);
1896 * drbd_send_all - Send an entire buffer
1898 * Returns 0 upon success and a negative error value otherwise.
1900 int drbd_send_all(struct drbd_connection *connection, struct socket *sock, void *buffer,
1901 size_t size, unsigned msg_flags)
1905 err = drbd_send(connection, sock, buffer, size, msg_flags);
1913 static int drbd_open(struct block_device *bdev, fmode_t mode)
1915 struct drbd_device *device = bdev->bd_disk->private_data;
1916 unsigned long flags;
1919 mutex_lock(&drbd_main_mutex);
1920 spin_lock_irqsave(&device->resource->req_lock, flags);
1921 /* to have a stable device->state.role
1922 * and no race with updating open_cnt */
1924 if (device->state.role != R_PRIMARY) {
1925 if (mode & FMODE_WRITE)
1927 else if (!drbd_allow_oos)
1933 spin_unlock_irqrestore(&device->resource->req_lock, flags);
1934 mutex_unlock(&drbd_main_mutex);
1939 static void drbd_release(struct gendisk *gd, fmode_t mode)
1941 struct drbd_device *device = gd->private_data;
1942 mutex_lock(&drbd_main_mutex);
1944 mutex_unlock(&drbd_main_mutex);
1947 /* need to hold resource->req_lock */
1948 void drbd_queue_unplug(struct drbd_device *device)
1950 if (device->state.pdsk >= D_INCONSISTENT && device->state.conn >= C_CONNECTED) {
1951 D_ASSERT(device, device->state.role == R_PRIMARY);
1952 if (test_and_clear_bit(UNPLUG_REMOTE, &device->flags)) {
1953 drbd_queue_work_if_unqueued(
1954 &first_peer_device(device)->connection->sender_work,
1955 &device->unplug_work);
1960 static void drbd_set_defaults(struct drbd_device *device)
1962 /* Beware! The actual layout differs
1963 * between big endian and little endian */
1964 device->state = (union drbd_dev_state) {
1965 { .role = R_SECONDARY,
1967 .conn = C_STANDALONE,
1973 void drbd_init_set_defaults(struct drbd_device *device)
1975 /* the memset(,0,) did most of this.
1976 * note: only assignments, no allocation in here */
1978 drbd_set_defaults(device);
1980 atomic_set(&device->ap_bio_cnt, 0);
1981 atomic_set(&device->ap_actlog_cnt, 0);
1982 atomic_set(&device->ap_pending_cnt, 0);
1983 atomic_set(&device->rs_pending_cnt, 0);
1984 atomic_set(&device->unacked_cnt, 0);
1985 atomic_set(&device->local_cnt, 0);
1986 atomic_set(&device->pp_in_use_by_net, 0);
1987 atomic_set(&device->rs_sect_in, 0);
1988 atomic_set(&device->rs_sect_ev, 0);
1989 atomic_set(&device->ap_in_flight, 0);
1990 atomic_set(&device->md_io.in_use, 0);
1992 mutex_init(&device->own_state_mutex);
1993 device->state_mutex = &device->own_state_mutex;
1995 spin_lock_init(&device->al_lock);
1996 spin_lock_init(&device->peer_seq_lock);
1998 INIT_LIST_HEAD(&device->active_ee);
1999 INIT_LIST_HEAD(&device->sync_ee);
2000 INIT_LIST_HEAD(&device->done_ee);
2001 INIT_LIST_HEAD(&device->read_ee);
2002 INIT_LIST_HEAD(&device->net_ee);
2003 INIT_LIST_HEAD(&device->resync_reads);
2004 INIT_LIST_HEAD(&device->resync_work.list);
2005 INIT_LIST_HEAD(&device->unplug_work.list);
2006 INIT_LIST_HEAD(&device->bm_io_work.w.list);
2007 INIT_LIST_HEAD(&device->pending_master_completion[0]);
2008 INIT_LIST_HEAD(&device->pending_master_completion[1]);
2009 INIT_LIST_HEAD(&device->pending_completion[0]);
2010 INIT_LIST_HEAD(&device->pending_completion[1]);
2012 device->resync_work.cb = w_resync_timer;
2013 device->unplug_work.cb = w_send_write_hint;
2014 device->bm_io_work.w.cb = w_bitmap_io;
2016 timer_setup(&device->resync_timer, resync_timer_fn, 0);
2017 timer_setup(&device->md_sync_timer, md_sync_timer_fn, 0);
2018 timer_setup(&device->start_resync_timer, start_resync_timer_fn, 0);
2019 timer_setup(&device->request_timer, request_timer_fn, 0);
2021 init_waitqueue_head(&device->misc_wait);
2022 init_waitqueue_head(&device->state_wait);
2023 init_waitqueue_head(&device->ee_wait);
2024 init_waitqueue_head(&device->al_wait);
2025 init_waitqueue_head(&device->seq_wait);
2027 device->resync_wenr = LC_FREE;
2028 device->peer_max_bio_size = DRBD_MAX_BIO_SIZE_SAFE;
2029 device->local_max_bio_size = DRBD_MAX_BIO_SIZE_SAFE;
2032 static void _drbd_set_my_capacity(struct drbd_device *device, sector_t size)
2034 /* set_capacity(device->this_bdev->bd_disk, size); */
2035 set_capacity(device->vdisk, size);
2036 device->this_bdev->bd_inode->i_size = (loff_t)size << 9;
2039 void drbd_set_my_capacity(struct drbd_device *device, sector_t size)
2042 _drbd_set_my_capacity(device, size);
2043 drbd_info(device, "size = %s (%llu KB)\n",
2044 ppsize(ppb, size>>1), (unsigned long long)size>>1);
2047 void drbd_device_cleanup(struct drbd_device *device)
2050 if (first_peer_device(device)->connection->receiver.t_state != NONE)
2051 drbd_err(device, "ASSERT FAILED: receiver t_state == %d expected 0.\n",
2052 first_peer_device(device)->connection->receiver.t_state);
2054 device->al_writ_cnt =
2055 device->bm_writ_cnt =
2063 device->rs_failed = 0;
2064 device->rs_last_events = 0;
2065 device->rs_last_sect_ev = 0;
2066 for (i = 0; i < DRBD_SYNC_MARKS; i++) {
2067 device->rs_mark_left[i] = 0;
2068 device->rs_mark_time[i] = 0;
2070 D_ASSERT(device, first_peer_device(device)->connection->net_conf == NULL);
2072 _drbd_set_my_capacity(device, 0);
2073 if (device->bitmap) {
2074 /* maybe never allocated. */
2075 drbd_bm_resize(device, 0, 1);
2076 drbd_bm_cleanup(device);
2079 drbd_backing_dev_free(device, device->ldev);
2080 device->ldev = NULL;
2082 clear_bit(AL_SUSPENDED, &device->flags);
2084 D_ASSERT(device, list_empty(&device->active_ee));
2085 D_ASSERT(device, list_empty(&device->sync_ee));
2086 D_ASSERT(device, list_empty(&device->done_ee));
2087 D_ASSERT(device, list_empty(&device->read_ee));
2088 D_ASSERT(device, list_empty(&device->net_ee));
2089 D_ASSERT(device, list_empty(&device->resync_reads));
2090 D_ASSERT(device, list_empty(&first_peer_device(device)->connection->sender_work.q));
2091 D_ASSERT(device, list_empty(&device->resync_work.list));
2092 D_ASSERT(device, list_empty(&device->unplug_work.list));
2094 drbd_set_defaults(device);
2098 static void drbd_destroy_mempools(void)
2102 while (drbd_pp_pool) {
2103 page = drbd_pp_pool;
2104 drbd_pp_pool = (struct page *)page_private(page);
2109 /* D_ASSERT(device, atomic_read(&drbd_pp_vacant)==0); */
2111 bioset_exit(&drbd_io_bio_set);
2112 bioset_exit(&drbd_md_io_bio_set);
2113 mempool_exit(&drbd_md_io_page_pool);
2114 mempool_exit(&drbd_ee_mempool);
2115 mempool_exit(&drbd_request_mempool);
2116 kmem_cache_destroy(drbd_ee_cache);
2117 kmem_cache_destroy(drbd_request_cache);
2118 kmem_cache_destroy(drbd_bm_ext_cache);
2119 kmem_cache_destroy(drbd_al_ext_cache);
2121 drbd_ee_cache = NULL;
2122 drbd_request_cache = NULL;
2123 drbd_bm_ext_cache = NULL;
2124 drbd_al_ext_cache = NULL;
2129 static int drbd_create_mempools(void)
2132 const int number = (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * drbd_minor_count;
2136 drbd_request_cache = kmem_cache_create(
2137 "drbd_req", sizeof(struct drbd_request), 0, 0, NULL);
2138 if (drbd_request_cache == NULL)
2141 drbd_ee_cache = kmem_cache_create(
2142 "drbd_ee", sizeof(struct drbd_peer_request), 0, 0, NULL);
2143 if (drbd_ee_cache == NULL)
2146 drbd_bm_ext_cache = kmem_cache_create(
2147 "drbd_bm", sizeof(struct bm_extent), 0, 0, NULL);
2148 if (drbd_bm_ext_cache == NULL)
2151 drbd_al_ext_cache = kmem_cache_create(
2152 "drbd_al", sizeof(struct lc_element), 0, 0, NULL);
2153 if (drbd_al_ext_cache == NULL)
2157 ret = bioset_init(&drbd_io_bio_set, BIO_POOL_SIZE, 0, 0);
2161 ret = bioset_init(&drbd_md_io_bio_set, DRBD_MIN_POOL_PAGES, 0,
2166 ret = mempool_init_page_pool(&drbd_md_io_page_pool, DRBD_MIN_POOL_PAGES, 0);
2170 ret = mempool_init_slab_pool(&drbd_request_mempool, number,
2171 drbd_request_cache);
2175 ret = mempool_init_slab_pool(&drbd_ee_mempool, number, drbd_ee_cache);
2179 /* drbd's page pool */
2180 spin_lock_init(&drbd_pp_lock);
2182 for (i = 0; i < number; i++) {
2183 page = alloc_page(GFP_HIGHUSER);
2186 set_page_private(page, (unsigned long)drbd_pp_pool);
2187 drbd_pp_pool = page;
2189 drbd_pp_vacant = number;
2194 drbd_destroy_mempools(); /* in case we allocated some */
2198 static void drbd_release_all_peer_reqs(struct drbd_device *device)
2202 rr = drbd_free_peer_reqs(device, &device->active_ee);
2204 drbd_err(device, "%d EEs in active list found!\n", rr);
2206 rr = drbd_free_peer_reqs(device, &device->sync_ee);
2208 drbd_err(device, "%d EEs in sync list found!\n", rr);
2210 rr = drbd_free_peer_reqs(device, &device->read_ee);
2212 drbd_err(device, "%d EEs in read list found!\n", rr);
2214 rr = drbd_free_peer_reqs(device, &device->done_ee);
2216 drbd_err(device, "%d EEs in done list found!\n", rr);
2218 rr = drbd_free_peer_reqs(device, &device->net_ee);
2220 drbd_err(device, "%d EEs in net list found!\n", rr);
2223 /* caution. no locking. */
2224 void drbd_destroy_device(struct kref *kref)
2226 struct drbd_device *device = container_of(kref, struct drbd_device, kref);
2227 struct drbd_resource *resource = device->resource;
2228 struct drbd_peer_device *peer_device, *tmp_peer_device;
2230 del_timer_sync(&device->request_timer);
2232 /* paranoia asserts */
2233 D_ASSERT(device, device->open_cnt == 0);
2234 /* end paranoia asserts */
2236 /* cleanup stuff that may have been allocated during
2237 * device (re-)configuration or state changes */
2239 if (device->this_bdev)
2240 bdput(device->this_bdev);
2242 drbd_backing_dev_free(device, device->ldev);
2243 device->ldev = NULL;
2245 drbd_release_all_peer_reqs(device);
2247 lc_destroy(device->act_log);
2248 lc_destroy(device->resync);
2250 kfree(device->p_uuid);
2251 /* device->p_uuid = NULL; */
2253 if (device->bitmap) /* should no longer be there. */
2254 drbd_bm_cleanup(device);
2255 __free_page(device->md_io.page);
2256 put_disk(device->vdisk);
2257 blk_cleanup_queue(device->rq_queue);
2258 kfree(device->rs_plan_s);
2260 /* not for_each_connection(connection, resource):
2261 * those may have been cleaned up and disassociated already.
2263 for_each_peer_device_safe(peer_device, tmp_peer_device, device) {
2264 kref_put(&peer_device->connection->kref, drbd_destroy_connection);
2267 memset(device, 0xfd, sizeof(*device));
2269 kref_put(&resource->kref, drbd_destroy_resource);
2272 /* One global retry thread, if we need to push back some bio and have it
2273 * reinserted through our make request function.
2275 static struct retry_worker {
2276 struct workqueue_struct *wq;
2277 struct work_struct worker;
2280 struct list_head writes;
2283 static void do_retry(struct work_struct *ws)
2285 struct retry_worker *retry = container_of(ws, struct retry_worker, worker);
2287 struct drbd_request *req, *tmp;
2289 spin_lock_irq(&retry->lock);
2290 list_splice_init(&retry->writes, &writes);
2291 spin_unlock_irq(&retry->lock);
2293 list_for_each_entry_safe(req, tmp, &writes, tl_requests) {
2294 struct drbd_device *device = req->device;
2295 struct bio *bio = req->master_bio;
2296 unsigned long start_jif = req->start_jif;
2300 expect(atomic_read(&req->completion_ref) == 0) &&
2301 expect(req->rq_state & RQ_POSTPONED) &&
2302 expect((req->rq_state & RQ_LOCAL_PENDING) == 0 ||
2303 (req->rq_state & RQ_LOCAL_ABORTED) != 0);
2306 drbd_err(device, "req=%p completion_ref=%d rq_state=%x\n",
2307 req, atomic_read(&req->completion_ref),
2310 /* We still need to put one kref associated with the
2311 * "completion_ref" going zero in the code path that queued it
2312 * here. The request object may still be referenced by a
2313 * frozen local req->private_bio, in case we force-detached.
2315 kref_put(&req->kref, drbd_req_destroy);
2317 /* A single suspended or otherwise blocking device may stall
2318 * all others as well. Fortunately, this code path is to
2319 * recover from a situation that "should not happen":
2320 * concurrent writes in multi-primary setup.
2321 * In a "normal" lifecycle, this workqueue is supposed to be
2322 * destroyed without ever doing anything.
2323 * If it turns out to be an issue anyways, we can do per
2324 * resource (replication group) or per device (minor) retry
2325 * workqueues instead.
2328 /* We are not just doing generic_make_request(),
2329 * as we want to keep the start_time information. */
2331 __drbd_make_request(device, bio, start_jif);
2335 /* called via drbd_req_put_completion_ref(),
2336 * holds resource->req_lock */
2337 void drbd_restart_request(struct drbd_request *req)
2339 unsigned long flags;
2340 spin_lock_irqsave(&retry.lock, flags);
2341 list_move_tail(&req->tl_requests, &retry.writes);
2342 spin_unlock_irqrestore(&retry.lock, flags);
2344 /* Drop the extra reference that would otherwise
2345 * have been dropped by complete_master_bio.
2346 * do_retry() needs to grab a new one. */
2347 dec_ap_bio(req->device);
2349 queue_work(retry.wq, &retry.worker);
2352 void drbd_destroy_resource(struct kref *kref)
2354 struct drbd_resource *resource =
2355 container_of(kref, struct drbd_resource, kref);
2357 idr_destroy(&resource->devices);
2358 free_cpumask_var(resource->cpu_mask);
2359 kfree(resource->name);
2360 memset(resource, 0xf2, sizeof(*resource));
2364 void drbd_free_resource(struct drbd_resource *resource)
2366 struct drbd_connection *connection, *tmp;
2368 for_each_connection_safe(connection, tmp, resource) {
2369 list_del(&connection->connections);
2370 drbd_debugfs_connection_cleanup(connection);
2371 kref_put(&connection->kref, drbd_destroy_connection);
2373 drbd_debugfs_resource_cleanup(resource);
2374 kref_put(&resource->kref, drbd_destroy_resource);
2377 static void drbd_cleanup(void)
2380 struct drbd_device *device;
2381 struct drbd_resource *resource, *tmp;
2383 /* first remove proc,
2384 * drbdsetup uses it's presence to detect
2385 * whether DRBD is loaded.
2386 * If we would get stuck in proc removal,
2387 * but have netlink already deregistered,
2388 * some drbdsetup commands may wait forever
2392 remove_proc_entry("drbd", NULL);
2395 destroy_workqueue(retry.wq);
2397 drbd_genl_unregister();
2399 idr_for_each_entry(&drbd_devices, device, i)
2400 drbd_delete_device(device);
2402 /* not _rcu since, no other updater anymore. Genl already unregistered */
2403 for_each_resource_safe(resource, tmp, &drbd_resources) {
2404 list_del(&resource->resources);
2405 drbd_free_resource(resource);
2408 drbd_debugfs_cleanup();
2410 drbd_destroy_mempools();
2411 unregister_blkdev(DRBD_MAJOR, "drbd");
2413 idr_destroy(&drbd_devices);
2415 pr_info("module cleanup done.\n");
2419 * drbd_congested() - Callback for the flusher thread
2420 * @congested_data: User data
2421 * @bdi_bits: Bits the BDI flusher thread is currently interested in
2423 * Returns 1<<WB_async_congested and/or 1<<WB_sync_congested if we are congested.
2425 static int drbd_congested(void *congested_data, int bdi_bits)
2427 struct drbd_device *device = congested_data;
2428 struct request_queue *q;
2432 if (!may_inc_ap_bio(device)) {
2433 /* DRBD has frozen IO */
2439 if (test_bit(CALLBACK_PENDING, &first_peer_device(device)->connection->flags)) {
2440 r |= (1 << WB_async_congested);
2441 /* Without good local data, we would need to read from remote,
2442 * and that would need the worker thread as well, which is
2443 * currently blocked waiting for that usermode helper to
2446 if (!get_ldev_if_state(device, D_UP_TO_DATE))
2447 r |= (1 << WB_sync_congested);
2455 if (get_ldev(device)) {
2456 q = bdev_get_queue(device->ldev->backing_bdev);
2457 r = bdi_congested(q->backing_dev_info, bdi_bits);
2463 if (bdi_bits & (1 << WB_async_congested) &&
2464 test_bit(NET_CONGESTED, &first_peer_device(device)->connection->flags)) {
2465 r |= (1 << WB_async_congested);
2466 reason = reason == 'b' ? 'a' : 'n';
2470 device->congestion_reason = reason;
2474 static void drbd_init_workqueue(struct drbd_work_queue* wq)
2476 spin_lock_init(&wq->q_lock);
2477 INIT_LIST_HEAD(&wq->q);
2478 init_waitqueue_head(&wq->q_wait);
2481 struct completion_work {
2483 struct completion done;
2486 static int w_complete(struct drbd_work *w, int cancel)
2488 struct completion_work *completion_work =
2489 container_of(w, struct completion_work, w);
2491 complete(&completion_work->done);
2495 void drbd_flush_workqueue(struct drbd_work_queue *work_queue)
2497 struct completion_work completion_work;
2499 completion_work.w.cb = w_complete;
2500 init_completion(&completion_work.done);
2501 drbd_queue_work(work_queue, &completion_work.w);
2502 wait_for_completion(&completion_work.done);
2505 struct drbd_resource *drbd_find_resource(const char *name)
2507 struct drbd_resource *resource;
2509 if (!name || !name[0])
2513 for_each_resource_rcu(resource, &drbd_resources) {
2514 if (!strcmp(resource->name, name)) {
2515 kref_get(&resource->kref);
2525 struct drbd_connection *conn_get_by_addrs(void *my_addr, int my_addr_len,
2526 void *peer_addr, int peer_addr_len)
2528 struct drbd_resource *resource;
2529 struct drbd_connection *connection;
2532 for_each_resource_rcu(resource, &drbd_resources) {
2533 for_each_connection_rcu(connection, resource) {
2534 if (connection->my_addr_len == my_addr_len &&
2535 connection->peer_addr_len == peer_addr_len &&
2536 !memcmp(&connection->my_addr, my_addr, my_addr_len) &&
2537 !memcmp(&connection->peer_addr, peer_addr, peer_addr_len)) {
2538 kref_get(&connection->kref);
2549 static int drbd_alloc_socket(struct drbd_socket *socket)
2551 socket->rbuf = (void *) __get_free_page(GFP_KERNEL);
2554 socket->sbuf = (void *) __get_free_page(GFP_KERNEL);
2560 static void drbd_free_socket(struct drbd_socket *socket)
2562 free_page((unsigned long) socket->sbuf);
2563 free_page((unsigned long) socket->rbuf);
2566 void conn_free_crypto(struct drbd_connection *connection)
2568 drbd_free_sock(connection);
2570 crypto_free_shash(connection->csums_tfm);
2571 crypto_free_shash(connection->verify_tfm);
2572 crypto_free_shash(connection->cram_hmac_tfm);
2573 crypto_free_shash(connection->integrity_tfm);
2574 crypto_free_shash(connection->peer_integrity_tfm);
2575 kfree(connection->int_dig_in);
2576 kfree(connection->int_dig_vv);
2578 connection->csums_tfm = NULL;
2579 connection->verify_tfm = NULL;
2580 connection->cram_hmac_tfm = NULL;
2581 connection->integrity_tfm = NULL;
2582 connection->peer_integrity_tfm = NULL;
2583 connection->int_dig_in = NULL;
2584 connection->int_dig_vv = NULL;
2587 int set_resource_options(struct drbd_resource *resource, struct res_opts *res_opts)
2589 struct drbd_connection *connection;
2590 cpumask_var_t new_cpu_mask;
2593 if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL))
2596 /* silently ignore cpu mask on UP kernel */
2597 if (nr_cpu_ids > 1 && res_opts->cpu_mask[0] != 0) {
2598 err = bitmap_parse(res_opts->cpu_mask, DRBD_CPU_MASK_SIZE,
2599 cpumask_bits(new_cpu_mask), nr_cpu_ids);
2600 if (err == -EOVERFLOW) {
2601 /* So what. mask it out. */
2602 cpumask_var_t tmp_cpu_mask;
2603 if (zalloc_cpumask_var(&tmp_cpu_mask, GFP_KERNEL)) {
2604 cpumask_setall(tmp_cpu_mask);
2605 cpumask_and(new_cpu_mask, new_cpu_mask, tmp_cpu_mask);
2606 drbd_warn(resource, "Overflow in bitmap_parse(%.12s%s), truncating to %u bits\n",
2608 strlen(res_opts->cpu_mask) > 12 ? "..." : "",
2610 free_cpumask_var(tmp_cpu_mask);
2615 drbd_warn(resource, "bitmap_parse() failed with %d\n", err);
2616 /* retcode = ERR_CPU_MASK_PARSE; */
2620 resource->res_opts = *res_opts;
2621 if (cpumask_empty(new_cpu_mask))
2622 drbd_calc_cpu_mask(&new_cpu_mask);
2623 if (!cpumask_equal(resource->cpu_mask, new_cpu_mask)) {
2624 cpumask_copy(resource->cpu_mask, new_cpu_mask);
2625 for_each_connection_rcu(connection, resource) {
2626 connection->receiver.reset_cpu_mask = 1;
2627 connection->ack_receiver.reset_cpu_mask = 1;
2628 connection->worker.reset_cpu_mask = 1;
2634 free_cpumask_var(new_cpu_mask);
2639 struct drbd_resource *drbd_create_resource(const char *name)
2641 struct drbd_resource *resource;
2643 resource = kzalloc(sizeof(struct drbd_resource), GFP_KERNEL);
2646 resource->name = kstrdup(name, GFP_KERNEL);
2647 if (!resource->name)
2648 goto fail_free_resource;
2649 if (!zalloc_cpumask_var(&resource->cpu_mask, GFP_KERNEL))
2650 goto fail_free_name;
2651 kref_init(&resource->kref);
2652 idr_init(&resource->devices);
2653 INIT_LIST_HEAD(&resource->connections);
2654 resource->write_ordering = WO_BDEV_FLUSH;
2655 list_add_tail_rcu(&resource->resources, &drbd_resources);
2656 mutex_init(&resource->conf_update);
2657 mutex_init(&resource->adm_mutex);
2658 spin_lock_init(&resource->req_lock);
2659 drbd_debugfs_resource_add(resource);
2663 kfree(resource->name);
2670 /* caller must be under adm_mutex */
2671 struct drbd_connection *conn_create(const char *name, struct res_opts *res_opts)
2673 struct drbd_resource *resource;
2674 struct drbd_connection *connection;
2676 connection = kzalloc(sizeof(struct drbd_connection), GFP_KERNEL);
2680 if (drbd_alloc_socket(&connection->data))
2682 if (drbd_alloc_socket(&connection->meta))
2685 connection->current_epoch = kzalloc(sizeof(struct drbd_epoch), GFP_KERNEL);
2686 if (!connection->current_epoch)
2689 INIT_LIST_HEAD(&connection->transfer_log);
2691 INIT_LIST_HEAD(&connection->current_epoch->list);
2692 connection->epochs = 1;
2693 spin_lock_init(&connection->epoch_lock);
2695 connection->send.seen_any_write_yet = false;
2696 connection->send.current_epoch_nr = 0;
2697 connection->send.current_epoch_writes = 0;
2699 resource = drbd_create_resource(name);
2703 connection->cstate = C_STANDALONE;
2704 mutex_init(&connection->cstate_mutex);
2705 init_waitqueue_head(&connection->ping_wait);
2706 idr_init(&connection->peer_devices);
2708 drbd_init_workqueue(&connection->sender_work);
2709 mutex_init(&connection->data.mutex);
2710 mutex_init(&connection->meta.mutex);
2712 drbd_thread_init(resource, &connection->receiver, drbd_receiver, "receiver");
2713 connection->receiver.connection = connection;
2714 drbd_thread_init(resource, &connection->worker, drbd_worker, "worker");
2715 connection->worker.connection = connection;
2716 drbd_thread_init(resource, &connection->ack_receiver, drbd_ack_receiver, "ack_recv");
2717 connection->ack_receiver.connection = connection;
2719 kref_init(&connection->kref);
2721 connection->resource = resource;
2723 if (set_resource_options(resource, res_opts))
2726 kref_get(&resource->kref);
2727 list_add_tail_rcu(&connection->connections, &resource->connections);
2728 drbd_debugfs_connection_add(connection);
2732 list_del(&resource->resources);
2733 drbd_free_resource(resource);
2735 kfree(connection->current_epoch);
2736 drbd_free_socket(&connection->meta);
2737 drbd_free_socket(&connection->data);
2742 void drbd_destroy_connection(struct kref *kref)
2744 struct drbd_connection *connection = container_of(kref, struct drbd_connection, kref);
2745 struct drbd_resource *resource = connection->resource;
2747 if (atomic_read(&connection->current_epoch->epoch_size) != 0)
2748 drbd_err(connection, "epoch_size:%d\n", atomic_read(&connection->current_epoch->epoch_size));
2749 kfree(connection->current_epoch);
2751 idr_destroy(&connection->peer_devices);
2753 drbd_free_socket(&connection->meta);
2754 drbd_free_socket(&connection->data);
2755 kfree(connection->int_dig_in);
2756 kfree(connection->int_dig_vv);
2757 memset(connection, 0xfc, sizeof(*connection));
2759 kref_put(&resource->kref, drbd_destroy_resource);
2762 static int init_submitter(struct drbd_device *device)
2764 /* opencoded create_singlethread_workqueue(),
2765 * to be able to say "drbd%d", ..., minor */
2767 alloc_ordered_workqueue("drbd%u_submit", WQ_MEM_RECLAIM, device->minor);
2768 if (!device->submit.wq)
2771 INIT_WORK(&device->submit.worker, do_submit);
2772 INIT_LIST_HEAD(&device->submit.writes);
2776 enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsigned int minor)
2778 struct drbd_resource *resource = adm_ctx->resource;
2779 struct drbd_connection *connection;
2780 struct drbd_device *device;
2781 struct drbd_peer_device *peer_device, *tmp_peer_device;
2782 struct gendisk *disk;
2783 struct request_queue *q;
2785 int vnr = adm_ctx->volume;
2786 enum drbd_ret_code err = ERR_NOMEM;
2788 device = minor_to_device(minor);
2790 return ERR_MINOR_OR_VOLUME_EXISTS;
2792 /* GFP_KERNEL, we are outside of all write-out paths */
2793 device = kzalloc(sizeof(struct drbd_device), GFP_KERNEL);
2796 kref_init(&device->kref);
2798 kref_get(&resource->kref);
2799 device->resource = resource;
2800 device->minor = minor;
2803 drbd_init_set_defaults(device);
2805 q = blk_alloc_queue_node(GFP_KERNEL, NUMA_NO_NODE);
2808 device->rq_queue = q;
2809 q->queuedata = device;
2811 disk = alloc_disk(1);
2814 device->vdisk = disk;
2816 set_disk_ro(disk, true);
2819 disk->major = DRBD_MAJOR;
2820 disk->first_minor = minor;
2821 disk->fops = &drbd_ops;
2822 sprintf(disk->disk_name, "drbd%d", minor);
2823 disk->private_data = device;
2825 device->this_bdev = bdget(MKDEV(DRBD_MAJOR, minor));
2826 /* we have no partitions. we contain only ourselves. */
2827 device->this_bdev->bd_contains = device->this_bdev;
2829 q->backing_dev_info->congested_fn = drbd_congested;
2830 q->backing_dev_info->congested_data = device;
2832 blk_queue_make_request(q, drbd_make_request);
2833 blk_queue_write_cache(q, true, true);
2834 /* Setting the max_hw_sectors to an odd value of 8kibyte here
2835 This triggers a max_bio_size message upon first attach or connect */
2836 blk_queue_max_hw_sectors(q, DRBD_MAX_BIO_SIZE_SAFE >> 8);
2838 device->md_io.page = alloc_page(GFP_KERNEL);
2839 if (!device->md_io.page)
2840 goto out_no_io_page;
2842 if (drbd_bm_init(device))
2844 device->read_requests = RB_ROOT;
2845 device->write_requests = RB_ROOT;
2847 id = idr_alloc(&drbd_devices, device, minor, minor + 1, GFP_KERNEL);
2850 err = ERR_MINOR_OR_VOLUME_EXISTS;
2851 goto out_no_minor_idr;
2853 kref_get(&device->kref);
2855 id = idr_alloc(&resource->devices, device, vnr, vnr + 1, GFP_KERNEL);
2858 err = ERR_MINOR_OR_VOLUME_EXISTS;
2859 goto out_idr_remove_minor;
2861 kref_get(&device->kref);
2863 INIT_LIST_HEAD(&device->peer_devices);
2864 INIT_LIST_HEAD(&device->pending_bitmap_io);
2865 for_each_connection(connection, resource) {
2866 peer_device = kzalloc(sizeof(struct drbd_peer_device), GFP_KERNEL);
2868 goto out_idr_remove_from_resource;
2869 peer_device->connection = connection;
2870 peer_device->device = device;
2872 list_add(&peer_device->peer_devices, &device->peer_devices);
2873 kref_get(&device->kref);
2875 id = idr_alloc(&connection->peer_devices, peer_device, vnr, vnr + 1, GFP_KERNEL);
2878 err = ERR_INVALID_REQUEST;
2879 goto out_idr_remove_from_resource;
2881 kref_get(&connection->kref);
2882 INIT_WORK(&peer_device->send_acks_work, drbd_send_acks_wf);
2885 if (init_submitter(device)) {
2887 goto out_idr_remove_vol;
2892 /* inherit the connection state */
2893 device->state.conn = first_connection(resource)->cstate;
2894 if (device->state.conn == C_WF_REPORT_PARAMS) {
2895 for_each_peer_device(peer_device, device)
2896 drbd_connected(peer_device);
2898 /* move to create_peer_device() */
2899 for_each_peer_device(peer_device, device)
2900 drbd_debugfs_peer_device_add(peer_device);
2901 drbd_debugfs_device_add(device);
2905 idr_remove(&connection->peer_devices, vnr);
2906 out_idr_remove_from_resource:
2907 for_each_connection(connection, resource) {
2908 peer_device = idr_remove(&connection->peer_devices, vnr);
2910 kref_put(&connection->kref, drbd_destroy_connection);
2912 for_each_peer_device_safe(peer_device, tmp_peer_device, device) {
2913 list_del(&peer_device->peer_devices);
2916 idr_remove(&resource->devices, vnr);
2917 out_idr_remove_minor:
2918 idr_remove(&drbd_devices, minor);
2921 drbd_bm_cleanup(device);
2923 __free_page(device->md_io.page);
2927 blk_cleanup_queue(q);
2929 kref_put(&resource->kref, drbd_destroy_resource);
2934 void drbd_delete_device(struct drbd_device *device)
2936 struct drbd_resource *resource = device->resource;
2937 struct drbd_connection *connection;
2938 struct drbd_peer_device *peer_device;
2940 /* move to free_peer_device() */
2941 for_each_peer_device(peer_device, device)
2942 drbd_debugfs_peer_device_cleanup(peer_device);
2943 drbd_debugfs_device_cleanup(device);
2944 for_each_connection(connection, resource) {
2945 idr_remove(&connection->peer_devices, device->vnr);
2946 kref_put(&device->kref, drbd_destroy_device);
2948 idr_remove(&resource->devices, device->vnr);
2949 kref_put(&device->kref, drbd_destroy_device);
2950 idr_remove(&drbd_devices, device_to_minor(device));
2951 kref_put(&device->kref, drbd_destroy_device);
2952 del_gendisk(device->vdisk);
2954 kref_put(&device->kref, drbd_destroy_device);
2957 static int __init drbd_init(void)
2961 if (drbd_minor_count < DRBD_MINOR_COUNT_MIN || drbd_minor_count > DRBD_MINOR_COUNT_MAX) {
2962 pr_err("invalid minor_count (%d)\n", drbd_minor_count);
2966 drbd_minor_count = DRBD_MINOR_COUNT_DEF;
2970 err = register_blkdev(DRBD_MAJOR, "drbd");
2972 pr_err("unable to register block device major %d\n",
2978 * allocate all necessary structs
2980 init_waitqueue_head(&drbd_pp_wait);
2982 drbd_proc = NULL; /* play safe for drbd_cleanup */
2983 idr_init(&drbd_devices);
2985 mutex_init(&resources_mutex);
2986 INIT_LIST_HEAD(&drbd_resources);
2988 err = drbd_genl_register();
2990 pr_err("unable to register generic netlink family\n");
2994 err = drbd_create_mempools();
2999 drbd_proc = proc_create_single("drbd", S_IFREG | 0444 , NULL, drbd_seq_show);
3001 pr_err("unable to register proc file\n");
3005 retry.wq = create_singlethread_workqueue("drbd-reissue");
3007 pr_err("unable to create retry workqueue\n");
3010 INIT_WORK(&retry.worker, do_retry);
3011 spin_lock_init(&retry.lock);
3012 INIT_LIST_HEAD(&retry.writes);
3014 drbd_debugfs_init();
3016 pr_info("initialized. "
3017 "Version: " REL_VERSION " (api:%d/proto:%d-%d)\n",
3018 API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX);
3019 pr_info("%s\n", drbd_buildtag());
3020 pr_info("registered as block device major %d\n", DRBD_MAJOR);
3021 return 0; /* Success! */
3026 pr_err("ran out of memory\n");
3028 pr_err("initialization failure\n");
3032 static void drbd_free_one_sock(struct drbd_socket *ds)
3035 mutex_lock(&ds->mutex);
3038 mutex_unlock(&ds->mutex);
3040 /* so debugfs does not need to mutex_lock() */
3042 kernel_sock_shutdown(s, SHUT_RDWR);
3047 void drbd_free_sock(struct drbd_connection *connection)
3049 if (connection->data.socket)
3050 drbd_free_one_sock(&connection->data);
3051 if (connection->meta.socket)
3052 drbd_free_one_sock(&connection->meta);
3055 /* meta data management */
3057 void conn_md_sync(struct drbd_connection *connection)
3059 struct drbd_peer_device *peer_device;
3063 idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
3064 struct drbd_device *device = peer_device->device;
3066 kref_get(&device->kref);
3068 drbd_md_sync(device);
3069 kref_put(&device->kref, drbd_destroy_device);
3075 /* aligned 4kByte */
3076 struct meta_data_on_disk {
3077 u64 la_size_sect; /* last agreed size. */
3078 u64 uuid[UI_SIZE]; /* UUIDs. */
3081 u32 flags; /* MDF */
3084 u32 al_offset; /* offset to this block */
3085 u32 al_nr_extents; /* important for restoring the AL (userspace) */
3086 /* `-- act_log->nr_elements <-- ldev->dc.al_extents */
3087 u32 bm_offset; /* offset to the bitmap, from here */
3088 u32 bm_bytes_per_bit; /* BM_BLOCK_SIZE */
3089 u32 la_peer_max_bio_size; /* last peer max_bio_size */
3091 /* see al_tr_number_to_on_disk_sector() */
3093 u32 al_stripe_size_4k;
3095 u8 reserved_u8[4096 - (7*8 + 10*4)];
3100 void drbd_md_write(struct drbd_device *device, void *b)
3102 struct meta_data_on_disk *buffer = b;
3106 memset(buffer, 0, sizeof(*buffer));
3108 buffer->la_size_sect = cpu_to_be64(drbd_get_capacity(device->this_bdev));
3109 for (i = UI_CURRENT; i < UI_SIZE; i++)
3110 buffer->uuid[i] = cpu_to_be64(device->ldev->md.uuid[i]);
3111 buffer->flags = cpu_to_be32(device->ldev->md.flags);
3112 buffer->magic = cpu_to_be32(DRBD_MD_MAGIC_84_UNCLEAN);
3114 buffer->md_size_sect = cpu_to_be32(device->ldev->md.md_size_sect);
3115 buffer->al_offset = cpu_to_be32(device->ldev->md.al_offset);
3116 buffer->al_nr_extents = cpu_to_be32(device->act_log->nr_elements);
3117 buffer->bm_bytes_per_bit = cpu_to_be32(BM_BLOCK_SIZE);
3118 buffer->device_uuid = cpu_to_be64(device->ldev->md.device_uuid);
3120 buffer->bm_offset = cpu_to_be32(device->ldev->md.bm_offset);
3121 buffer->la_peer_max_bio_size = cpu_to_be32(device->peer_max_bio_size);
3123 buffer->al_stripes = cpu_to_be32(device->ldev->md.al_stripes);
3124 buffer->al_stripe_size_4k = cpu_to_be32(device->ldev->md.al_stripe_size_4k);
3126 D_ASSERT(device, drbd_md_ss(device->ldev) == device->ldev->md.md_offset);
3127 sector = device->ldev->md.md_offset;
3129 if (drbd_md_sync_page_io(device, device->ldev, sector, REQ_OP_WRITE)) {
3130 /* this was a try anyways ... */
3131 drbd_err(device, "meta data update failed!\n");
3132 drbd_chk_io_error(device, 1, DRBD_META_IO_ERROR);
3137 * drbd_md_sync() - Writes the meta data super block if the MD_DIRTY flag bit is set
3138 * @device: DRBD device.
3140 void drbd_md_sync(struct drbd_device *device)
3142 struct meta_data_on_disk *buffer;
3144 /* Don't accidentally change the DRBD meta data layout. */
3145 BUILD_BUG_ON(UI_SIZE != 4);
3146 BUILD_BUG_ON(sizeof(struct meta_data_on_disk) != 4096);
3148 del_timer(&device->md_sync_timer);
3149 /* timer may be rearmed by drbd_md_mark_dirty() now. */
3150 if (!test_and_clear_bit(MD_DIRTY, &device->flags))
3153 /* We use here D_FAILED and not D_ATTACHING because we try to write
3154 * metadata even if we detach due to a disk failure! */
3155 if (!get_ldev_if_state(device, D_FAILED))
3158 buffer = drbd_md_get_buffer(device, __func__);
3162 drbd_md_write(device, buffer);
3164 /* Update device->ldev->md.la_size_sect,
3165 * since we updated it on metadata. */
3166 device->ldev->md.la_size_sect = drbd_get_capacity(device->this_bdev);
3168 drbd_md_put_buffer(device);
3173 static int check_activity_log_stripe_size(struct drbd_device *device,
3174 struct meta_data_on_disk *on_disk,
3175 struct drbd_md *in_core)
3177 u32 al_stripes = be32_to_cpu(on_disk->al_stripes);
3178 u32 al_stripe_size_4k = be32_to_cpu(on_disk->al_stripe_size_4k);
3181 /* both not set: default to old fixed size activity log */
3182 if (al_stripes == 0 && al_stripe_size_4k == 0) {
3184 al_stripe_size_4k = MD_32kB_SECT/8;
3187 /* some paranoia plausibility checks */
3189 /* we need both values to be set */
3190 if (al_stripes == 0 || al_stripe_size_4k == 0)
3193 al_size_4k = (u64)al_stripes * al_stripe_size_4k;
3195 /* Upper limit of activity log area, to avoid potential overflow
3196 * problems in al_tr_number_to_on_disk_sector(). As right now, more
3197 * than 72 * 4k blocks total only increases the amount of history,
3198 * limiting this arbitrarily to 16 GB is not a real limitation ;-) */
3199 if (al_size_4k > (16 * 1024 * 1024/4))
3202 /* Lower limit: we need at least 8 transaction slots (32kB)
3203 * to not break existing setups */
3204 if (al_size_4k < MD_32kB_SECT/8)
3207 in_core->al_stripe_size_4k = al_stripe_size_4k;
3208 in_core->al_stripes = al_stripes;
3209 in_core->al_size_4k = al_size_4k;
3213 drbd_err(device, "invalid activity log striping: al_stripes=%u, al_stripe_size_4k=%u\n",
3214 al_stripes, al_stripe_size_4k);
3218 static int check_offsets_and_sizes(struct drbd_device *device, struct drbd_backing_dev *bdev)
3220 sector_t capacity = drbd_get_capacity(bdev->md_bdev);
3221 struct drbd_md *in_core = &bdev->md;
3222 s32 on_disk_al_sect;
3223 s32 on_disk_bm_sect;
3225 /* The on-disk size of the activity log, calculated from offsets, and
3226 * the size of the activity log calculated from the stripe settings,
3228 * Though we could relax this a bit: it is ok, if the striped activity log
3229 * fits in the available on-disk activity log size.
3230 * Right now, that would break how resize is implemented.
3231 * TODO: make drbd_determine_dev_size() (and the drbdmeta tool) aware
3232 * of possible unused padding space in the on disk layout. */
3233 if (in_core->al_offset < 0) {
3234 if (in_core->bm_offset > in_core->al_offset)
3236 on_disk_al_sect = -in_core->al_offset;
3237 on_disk_bm_sect = in_core->al_offset - in_core->bm_offset;
3239 if (in_core->al_offset != MD_4kB_SECT)
3241 if (in_core->bm_offset < in_core->al_offset + in_core->al_size_4k * MD_4kB_SECT)
3244 on_disk_al_sect = in_core->bm_offset - MD_4kB_SECT;
3245 on_disk_bm_sect = in_core->md_size_sect - in_core->bm_offset;
3248 /* old fixed size meta data is exactly that: fixed. */
3249 if (in_core->meta_dev_idx >= 0) {
3250 if (in_core->md_size_sect != MD_128MB_SECT
3251 || in_core->al_offset != MD_4kB_SECT
3252 || in_core->bm_offset != MD_4kB_SECT + MD_32kB_SECT
3253 || in_core->al_stripes != 1
3254 || in_core->al_stripe_size_4k != MD_32kB_SECT/8)
3258 if (capacity < in_core->md_size_sect)
3260 if (capacity - in_core->md_size_sect < drbd_md_first_sector(bdev))
3263 /* should be aligned, and at least 32k */
3264 if ((on_disk_al_sect & 7) || (on_disk_al_sect < MD_32kB_SECT))
3267 /* should fit (for now: exactly) into the available on-disk space;
3268 * overflow prevention is in check_activity_log_stripe_size() above. */
3269 if (on_disk_al_sect != in_core->al_size_4k * MD_4kB_SECT)
3272 /* again, should be aligned */
3273 if (in_core->bm_offset & 7)
3276 /* FIXME check for device grow with flex external meta data? */
3278 /* can the available bitmap space cover the last agreed device size? */
3279 if (on_disk_bm_sect < (in_core->la_size_sect+7)/MD_4kB_SECT/8/512)
3285 drbd_err(device, "meta data offsets don't make sense: idx=%d "
3286 "al_s=%u, al_sz4k=%u, al_offset=%d, bm_offset=%d, "
3287 "md_size_sect=%u, la_size=%llu, md_capacity=%llu\n",
3288 in_core->meta_dev_idx,
3289 in_core->al_stripes, in_core->al_stripe_size_4k,
3290 in_core->al_offset, in_core->bm_offset, in_core->md_size_sect,
3291 (unsigned long long)in_core->la_size_sect,
3292 (unsigned long long)capacity);
3299 * drbd_md_read() - Reads in the meta data super block
3300 * @device: DRBD device.
3301 * @bdev: Device from which the meta data should be read in.
3303 * Return NO_ERROR on success, and an enum drbd_ret_code in case
3304 * something goes wrong.
3306 * Called exactly once during drbd_adm_attach(), while still being D_DISKLESS,
3307 * even before @bdev is assigned to @device->ldev.
3309 int drbd_md_read(struct drbd_device *device, struct drbd_backing_dev *bdev)
3311 struct meta_data_on_disk *buffer;
3313 int i, rv = NO_ERROR;
3315 if (device->state.disk != D_DISKLESS)
3316 return ERR_DISK_CONFIGURED;
3318 buffer = drbd_md_get_buffer(device, __func__);
3322 /* First, figure out where our meta data superblock is located,
3324 bdev->md.meta_dev_idx = bdev->disk_conf->meta_dev_idx;
3325 bdev->md.md_offset = drbd_md_ss(bdev);
3326 /* Even for (flexible or indexed) external meta data,
3327 * initially restrict us to the 4k superblock for now.
3328 * Affects the paranoia out-of-range access check in drbd_md_sync_page_io(). */
3329 bdev->md.md_size_sect = 8;
3331 if (drbd_md_sync_page_io(device, bdev, bdev->md.md_offset,
3333 /* NOTE: can't do normal error processing here as this is
3334 called BEFORE disk is attached */
3335 drbd_err(device, "Error while reading metadata.\n");
3336 rv = ERR_IO_MD_DISK;
3340 magic = be32_to_cpu(buffer->magic);
3341 flags = be32_to_cpu(buffer->flags);
3342 if (magic == DRBD_MD_MAGIC_84_UNCLEAN ||
3343 (magic == DRBD_MD_MAGIC_08 && !(flags & MDF_AL_CLEAN))) {
3344 /* btw: that's Activity Log clean, not "all" clean. */
3345 drbd_err(device, "Found unclean meta data. Did you \"drbdadm apply-al\"?\n");
3346 rv = ERR_MD_UNCLEAN;
3350 rv = ERR_MD_INVALID;
3351 if (magic != DRBD_MD_MAGIC_08) {
3352 if (magic == DRBD_MD_MAGIC_07)
3353 drbd_err(device, "Found old (0.7) meta data magic. Did you \"drbdadm create-md\"?\n");
3355 drbd_err(device, "Meta data magic not found. Did you \"drbdadm create-md\"?\n");
3359 if (be32_to_cpu(buffer->bm_bytes_per_bit) != BM_BLOCK_SIZE) {
3360 drbd_err(device, "unexpected bm_bytes_per_bit: %u (expected %u)\n",
3361 be32_to_cpu(buffer->bm_bytes_per_bit), BM_BLOCK_SIZE);
3366 /* convert to in_core endian */
3367 bdev->md.la_size_sect = be64_to_cpu(buffer->la_size_sect);
3368 for (i = UI_CURRENT; i < UI_SIZE; i++)
3369 bdev->md.uuid[i] = be64_to_cpu(buffer->uuid[i]);
3370 bdev->md.flags = be32_to_cpu(buffer->flags);
3371 bdev->md.device_uuid = be64_to_cpu(buffer->device_uuid);
3373 bdev->md.md_size_sect = be32_to_cpu(buffer->md_size_sect);
3374 bdev->md.al_offset = be32_to_cpu(buffer->al_offset);
3375 bdev->md.bm_offset = be32_to_cpu(buffer->bm_offset);
3377 if (check_activity_log_stripe_size(device, buffer, &bdev->md))
3379 if (check_offsets_and_sizes(device, bdev))
3382 if (be32_to_cpu(buffer->bm_offset) != bdev->md.bm_offset) {
3383 drbd_err(device, "unexpected bm_offset: %d (expected %d)\n",
3384 be32_to_cpu(buffer->bm_offset), bdev->md.bm_offset);
3387 if (be32_to_cpu(buffer->md_size_sect) != bdev->md.md_size_sect) {
3388 drbd_err(device, "unexpected md_size: %u (expected %u)\n",
3389 be32_to_cpu(buffer->md_size_sect), bdev->md.md_size_sect);
3395 spin_lock_irq(&device->resource->req_lock);
3396 if (device->state.conn < C_CONNECTED) {
3398 peer = be32_to_cpu(buffer->la_peer_max_bio_size);
3399 peer = max(peer, DRBD_MAX_BIO_SIZE_SAFE);
3400 device->peer_max_bio_size = peer;
3402 spin_unlock_irq(&device->resource->req_lock);
3405 drbd_md_put_buffer(device);
3411 * drbd_md_mark_dirty() - Mark meta data super block as dirty
3412 * @device: DRBD device.
3414 * Call this function if you change anything that should be written to
3415 * the meta-data super block. This function sets MD_DIRTY, and starts a
3416 * timer that ensures that within five seconds you have to call drbd_md_sync().
3419 void drbd_md_mark_dirty_(struct drbd_device *device, unsigned int line, const char *func)
3421 if (!test_and_set_bit(MD_DIRTY, &device->flags)) {
3422 mod_timer(&device->md_sync_timer, jiffies + HZ);
3423 device->last_md_mark_dirty.line = line;
3424 device->last_md_mark_dirty.func = func;
3428 void drbd_md_mark_dirty(struct drbd_device *device)
3430 if (!test_and_set_bit(MD_DIRTY, &device->flags))
3431 mod_timer(&device->md_sync_timer, jiffies + 5*HZ);
3435 void drbd_uuid_move_history(struct drbd_device *device) __must_hold(local)
3439 for (i = UI_HISTORY_START; i < UI_HISTORY_END; i++)
3440 device->ldev->md.uuid[i+1] = device->ldev->md.uuid[i];
3443 void __drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local)
3445 if (idx == UI_CURRENT) {
3446 if (device->state.role == R_PRIMARY)
3451 drbd_set_ed_uuid(device, val);
3454 device->ldev->md.uuid[idx] = val;
3455 drbd_md_mark_dirty(device);
3458 void _drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local)
3460 unsigned long flags;
3461 spin_lock_irqsave(&device->ldev->md.uuid_lock, flags);
3462 __drbd_uuid_set(device, idx, val);
3463 spin_unlock_irqrestore(&device->ldev->md.uuid_lock, flags);
3466 void drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local)
3468 unsigned long flags;
3469 spin_lock_irqsave(&device->ldev->md.uuid_lock, flags);
3470 if (device->ldev->md.uuid[idx]) {
3471 drbd_uuid_move_history(device);
3472 device->ldev->md.uuid[UI_HISTORY_START] = device->ldev->md.uuid[idx];
3474 __drbd_uuid_set(device, idx, val);
3475 spin_unlock_irqrestore(&device->ldev->md.uuid_lock, flags);
3479 * drbd_uuid_new_current() - Creates a new current UUID
3480 * @device: DRBD device.
3482 * Creates a new current UUID, and rotates the old current UUID into
3483 * the bitmap slot. Causes an incremental resync upon next connect.
3485 void drbd_uuid_new_current(struct drbd_device *device) __must_hold(local)
3488 unsigned long long bm_uuid;
3490 get_random_bytes(&val, sizeof(u64));
3492 spin_lock_irq(&device->ldev->md.uuid_lock);
3493 bm_uuid = device->ldev->md.uuid[UI_BITMAP];
3496 drbd_warn(device, "bm UUID was already set: %llX\n", bm_uuid);
3498 device->ldev->md.uuid[UI_BITMAP] = device->ldev->md.uuid[UI_CURRENT];
3499 __drbd_uuid_set(device, UI_CURRENT, val);
3500 spin_unlock_irq(&device->ldev->md.uuid_lock);
3502 drbd_print_uuids(device, "new current UUID");
3503 /* get it to stable storage _now_ */
3504 drbd_md_sync(device);
3507 void drbd_uuid_set_bm(struct drbd_device *device, u64 val) __must_hold(local)
3509 unsigned long flags;
3510 if (device->ldev->md.uuid[UI_BITMAP] == 0 && val == 0)
3513 spin_lock_irqsave(&device->ldev->md.uuid_lock, flags);
3515 drbd_uuid_move_history(device);
3516 device->ldev->md.uuid[UI_HISTORY_START] = device->ldev->md.uuid[UI_BITMAP];
3517 device->ldev->md.uuid[UI_BITMAP] = 0;
3519 unsigned long long bm_uuid = device->ldev->md.uuid[UI_BITMAP];
3521 drbd_warn(device, "bm UUID was already set: %llX\n", bm_uuid);
3523 device->ldev->md.uuid[UI_BITMAP] = val & ~((u64)1);
3525 spin_unlock_irqrestore(&device->ldev->md.uuid_lock, flags);
3527 drbd_md_mark_dirty(device);
3531 * drbd_bmio_set_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
3532 * @device: DRBD device.
3534 * Sets all bits in the bitmap and writes the whole bitmap to stable storage.
3536 int drbd_bmio_set_n_write(struct drbd_device *device) __must_hold(local)
3540 drbd_md_set_flag(device, MDF_FULL_SYNC);
3541 drbd_md_sync(device);
3542 drbd_bm_set_all(device);
3544 rv = drbd_bm_write(device);
3547 drbd_md_clear_flag(device, MDF_FULL_SYNC);
3548 drbd_md_sync(device);
3555 * drbd_bmio_clear_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
3556 * @device: DRBD device.
3558 * Clears all bits in the bitmap and writes the whole bitmap to stable storage.
3560 int drbd_bmio_clear_n_write(struct drbd_device *device) __must_hold(local)
3562 drbd_resume_al(device);
3563 drbd_bm_clear_all(device);
3564 return drbd_bm_write(device);
3567 static int w_bitmap_io(struct drbd_work *w, int unused)
3569 struct drbd_device *device =
3570 container_of(w, struct drbd_device, bm_io_work.w);
3571 struct bm_io_work *work = &device->bm_io_work;
3574 if (work->flags != BM_LOCKED_CHANGE_ALLOWED) {
3575 int cnt = atomic_read(&device->ap_bio_cnt);
3577 drbd_err(device, "FIXME: ap_bio_cnt %d, expected 0; queued for '%s'\n",
3581 if (get_ldev(device)) {
3582 drbd_bm_lock(device, work->why, work->flags);
3583 rv = work->io_fn(device);
3584 drbd_bm_unlock(device);
3588 clear_bit_unlock(BITMAP_IO, &device->flags);
3589 wake_up(&device->misc_wait);
3592 work->done(device, rv);
3594 clear_bit(BITMAP_IO_QUEUED, &device->flags);
3602 * drbd_queue_bitmap_io() - Queues an IO operation on the whole bitmap
3603 * @device: DRBD device.
3604 * @io_fn: IO callback to be called when bitmap IO is possible
3605 * @done: callback to be called after the bitmap IO was performed
3606 * @why: Descriptive text of the reason for doing the IO
3608 * While IO on the bitmap happens we freeze application IO thus we ensure
3609 * that drbd_set_out_of_sync() can not be called. This function MAY ONLY be
3610 * called from worker context. It MUST NOT be used while a previous such
3611 * work is still pending!
3613 * Its worker function encloses the call of io_fn() by get_ldev() and
3616 void drbd_queue_bitmap_io(struct drbd_device *device,
3617 int (*io_fn)(struct drbd_device *),
3618 void (*done)(struct drbd_device *, int),
3619 char *why, enum bm_flag flags)
3621 D_ASSERT(device, current == first_peer_device(device)->connection->worker.task);
3623 D_ASSERT(device, !test_bit(BITMAP_IO_QUEUED, &device->flags));
3624 D_ASSERT(device, !test_bit(BITMAP_IO, &device->flags));
3625 D_ASSERT(device, list_empty(&device->bm_io_work.w.list));
3626 if (device->bm_io_work.why)
3627 drbd_err(device, "FIXME going to queue '%s' but '%s' still pending?\n",
3628 why, device->bm_io_work.why);
3630 device->bm_io_work.io_fn = io_fn;
3631 device->bm_io_work.done = done;
3632 device->bm_io_work.why = why;
3633 device->bm_io_work.flags = flags;
3635 spin_lock_irq(&device->resource->req_lock);
3636 set_bit(BITMAP_IO, &device->flags);
3637 /* don't wait for pending application IO if the caller indicates that
3638 * application IO does not conflict anyways. */
3639 if (flags == BM_LOCKED_CHANGE_ALLOWED || atomic_read(&device->ap_bio_cnt) == 0) {
3640 if (!test_and_set_bit(BITMAP_IO_QUEUED, &device->flags))
3641 drbd_queue_work(&first_peer_device(device)->connection->sender_work,
3642 &device->bm_io_work.w);
3644 spin_unlock_irq(&device->resource->req_lock);
3648 * drbd_bitmap_io() - Does an IO operation on the whole bitmap
3649 * @device: DRBD device.
3650 * @io_fn: IO callback to be called when bitmap IO is possible
3651 * @why: Descriptive text of the reason for doing the IO
3653 * freezes application IO while that the actual IO operations runs. This
3654 * functions MAY NOT be called from worker context.
3656 int drbd_bitmap_io(struct drbd_device *device, int (*io_fn)(struct drbd_device *),
3657 char *why, enum bm_flag flags)
3659 /* Only suspend io, if some operation is supposed to be locked out */
3660 const bool do_suspend_io = flags & (BM_DONT_CLEAR|BM_DONT_SET|BM_DONT_TEST);
3663 D_ASSERT(device, current != first_peer_device(device)->connection->worker.task);
3666 drbd_suspend_io(device);
3668 drbd_bm_lock(device, why, flags);
3670 drbd_bm_unlock(device);
3673 drbd_resume_io(device);
3678 void drbd_md_set_flag(struct drbd_device *device, int flag) __must_hold(local)
3680 if ((device->ldev->md.flags & flag) != flag) {
3681 drbd_md_mark_dirty(device);
3682 device->ldev->md.flags |= flag;
3686 void drbd_md_clear_flag(struct drbd_device *device, int flag) __must_hold(local)
3688 if ((device->ldev->md.flags & flag) != 0) {
3689 drbd_md_mark_dirty(device);
3690 device->ldev->md.flags &= ~flag;
3693 int drbd_md_test_flag(struct drbd_backing_dev *bdev, int flag)
3695 return (bdev->md.flags & flag) != 0;
3698 static void md_sync_timer_fn(struct timer_list *t)
3700 struct drbd_device *device = from_timer(device, t, md_sync_timer);
3701 drbd_device_post_work(device, MD_SYNC);
3704 const char *cmdname(enum drbd_packet cmd)
3706 /* THINK may need to become several global tables
3707 * when we want to support more than
3708 * one PRO_VERSION */
3709 static const char *cmdnames[] = {
3711 [P_WSAME] = "WriteSame",
3713 [P_DATA_REPLY] = "DataReply",
3714 [P_RS_DATA_REPLY] = "RSDataReply",
3715 [P_BARRIER] = "Barrier",
3716 [P_BITMAP] = "ReportBitMap",
3717 [P_BECOME_SYNC_TARGET] = "BecomeSyncTarget",
3718 [P_BECOME_SYNC_SOURCE] = "BecomeSyncSource",
3719 [P_UNPLUG_REMOTE] = "UnplugRemote",
3720 [P_DATA_REQUEST] = "DataRequest",
3721 [P_RS_DATA_REQUEST] = "RSDataRequest",
3722 [P_SYNC_PARAM] = "SyncParam",
3723 [P_SYNC_PARAM89] = "SyncParam89",
3724 [P_PROTOCOL] = "ReportProtocol",
3725 [P_UUIDS] = "ReportUUIDs",
3726 [P_SIZES] = "ReportSizes",
3727 [P_STATE] = "ReportState",
3728 [P_SYNC_UUID] = "ReportSyncUUID",
3729 [P_AUTH_CHALLENGE] = "AuthChallenge",
3730 [P_AUTH_RESPONSE] = "AuthResponse",
3732 [P_PING_ACK] = "PingAck",
3733 [P_RECV_ACK] = "RecvAck",
3734 [P_WRITE_ACK] = "WriteAck",
3735 [P_RS_WRITE_ACK] = "RSWriteAck",
3736 [P_SUPERSEDED] = "Superseded",
3737 [P_NEG_ACK] = "NegAck",
3738 [P_NEG_DREPLY] = "NegDReply",
3739 [P_NEG_RS_DREPLY] = "NegRSDReply",
3740 [P_BARRIER_ACK] = "BarrierAck",
3741 [P_STATE_CHG_REQ] = "StateChgRequest",
3742 [P_STATE_CHG_REPLY] = "StateChgReply",
3743 [P_OV_REQUEST] = "OVRequest",
3744 [P_OV_REPLY] = "OVReply",
3745 [P_OV_RESULT] = "OVResult",
3746 [P_CSUM_RS_REQUEST] = "CsumRSRequest",
3747 [P_RS_IS_IN_SYNC] = "CsumRSIsInSync",
3748 [P_COMPRESSED_BITMAP] = "CBitmap",
3749 [P_DELAY_PROBE] = "DelayProbe",
3750 [P_OUT_OF_SYNC] = "OutOfSync",
3751 [P_RETRY_WRITE] = "RetryWrite",
3752 [P_RS_CANCEL] = "RSCancel",
3753 [P_CONN_ST_CHG_REQ] = "conn_st_chg_req",
3754 [P_CONN_ST_CHG_REPLY] = "conn_st_chg_reply",
3755 [P_RETRY_WRITE] = "retry_write",
3756 [P_PROTOCOL_UPDATE] = "protocol_update",
3757 [P_RS_THIN_REQ] = "rs_thin_req",
3758 [P_RS_DEALLOCATED] = "rs_deallocated",
3760 /* enum drbd_packet, but not commands - obsoleted flags:
3766 /* too big for the array: 0xfffX */
3767 if (cmd == P_INITIAL_META)
3768 return "InitialMeta";
3769 if (cmd == P_INITIAL_DATA)
3770 return "InitialData";
3771 if (cmd == P_CONNECTION_FEATURES)
3772 return "ConnectionFeatures";
3773 if (cmd >= ARRAY_SIZE(cmdnames))
3775 return cmdnames[cmd];
3779 * drbd_wait_misc - wait for a request to make progress
3780 * @device: device associated with the request
3781 * @i: the struct drbd_interval embedded in struct drbd_request or
3782 * struct drbd_peer_request
3784 int drbd_wait_misc(struct drbd_device *device, struct drbd_interval *i)
3786 struct net_conf *nc;
3791 nc = rcu_dereference(first_peer_device(device)->connection->net_conf);
3796 timeout = nc->ko_count ? nc->timeout * HZ / 10 * nc->ko_count : MAX_SCHEDULE_TIMEOUT;
3799 /* Indicate to wake up device->misc_wait on progress. */
3801 prepare_to_wait(&device->misc_wait, &wait, TASK_INTERRUPTIBLE);
3802 spin_unlock_irq(&device->resource->req_lock);
3803 timeout = schedule_timeout(timeout);
3804 finish_wait(&device->misc_wait, &wait);
3805 spin_lock_irq(&device->resource->req_lock);
3806 if (!timeout || device->state.conn < C_CONNECTED)
3808 if (signal_pending(current))
3809 return -ERESTARTSYS;
3813 void lock_all_resources(void)
3815 struct drbd_resource *resource;
3816 int __maybe_unused i = 0;
3818 mutex_lock(&resources_mutex);
3819 local_irq_disable();
3820 for_each_resource(resource, &drbd_resources)
3821 spin_lock_nested(&resource->req_lock, i++);
3824 void unlock_all_resources(void)
3826 struct drbd_resource *resource;
3828 for_each_resource(resource, &drbd_resources)
3829 spin_unlock(&resource->req_lock);
3831 mutex_unlock(&resources_mutex);
3834 #ifdef CONFIG_DRBD_FAULT_INJECTION
3835 /* Fault insertion support including random number generator shamelessly
3836 * stolen from kernel/rcutorture.c */
3837 struct fault_random_state {
3838 unsigned long state;
3839 unsigned long count;
3842 #define FAULT_RANDOM_MULT 39916801 /* prime */
3843 #define FAULT_RANDOM_ADD 479001701 /* prime */
3844 #define FAULT_RANDOM_REFRESH 10000
3847 * Crude but fast random-number generator. Uses a linear congruential
3848 * generator, with occasional help from get_random_bytes().
3850 static unsigned long
3851 _drbd_fault_random(struct fault_random_state *rsp)
3855 if (!rsp->count--) {
3856 get_random_bytes(&refresh, sizeof(refresh));
3857 rsp->state += refresh;
3858 rsp->count = FAULT_RANDOM_REFRESH;
3860 rsp->state = rsp->state * FAULT_RANDOM_MULT + FAULT_RANDOM_ADD;
3861 return swahw32(rsp->state);
3865 _drbd_fault_str(unsigned int type) {
3866 static char *_faults[] = {
3867 [DRBD_FAULT_MD_WR] = "Meta-data write",
3868 [DRBD_FAULT_MD_RD] = "Meta-data read",
3869 [DRBD_FAULT_RS_WR] = "Resync write",
3870 [DRBD_FAULT_RS_RD] = "Resync read",
3871 [DRBD_FAULT_DT_WR] = "Data write",
3872 [DRBD_FAULT_DT_RD] = "Data read",
3873 [DRBD_FAULT_DT_RA] = "Data read ahead",
3874 [DRBD_FAULT_BM_ALLOC] = "BM allocation",
3875 [DRBD_FAULT_AL_EE] = "EE allocation",
3876 [DRBD_FAULT_RECEIVE] = "receive data corruption",
3879 return (type < DRBD_FAULT_MAX) ? _faults[type] : "**Unknown**";
3883 _drbd_insert_fault(struct drbd_device *device, unsigned int type)
3885 static struct fault_random_state rrs = {0, 0};
3887 unsigned int ret = (
3888 (drbd_fault_devs == 0 ||
3889 ((1 << device_to_minor(device)) & drbd_fault_devs) != 0) &&
3890 (((_drbd_fault_random(&rrs) % 100) + 1) <= drbd_fault_rate));
3895 if (__ratelimit(&drbd_ratelimit_state))
3896 drbd_warn(device, "***Simulating %s failure\n",
3897 _drbd_fault_str(type));
3904 const char *drbd_buildtag(void)
3906 /* DRBD built from external sources has here a reference to the
3907 git hash of the source code. */
3909 static char buildtag[38] = "\0uilt-in";
3911 if (buildtag[0] == 0) {
3913 sprintf(buildtag, "srcversion: %-24s", THIS_MODULE->srcversion);
3922 module_init(drbd_init)
3923 module_exit(drbd_cleanup)
3925 EXPORT_SYMBOL(drbd_conn_str);
3926 EXPORT_SYMBOL(drbd_role_str);
3927 EXPORT_SYMBOL(drbd_disk_str);
3928 EXPORT_SYMBOL(drbd_set_st_err_str);