4 This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
6 Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
7 Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
8 Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
10 Thanks to Carter Burden, Bart Grantham and Gennadiy Nerubayev
11 from Logicworks, Inc. for making SDP replication support possible.
13 drbd is free software; you can redistribute it and/or modify
14 it under the terms of the GNU General Public License as published by
15 the Free Software Foundation; either version 2, or (at your option)
18 drbd is distributed in the hope that it will be useful,
19 but WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 GNU General Public License for more details.
23 You should have received a copy of the GNU General Public License
24 along with drbd; see the file COPYING. If not, write to
25 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
29 #include <linux/module.h>
30 #include <linux/drbd.h>
31 #include <asm/uaccess.h>
32 #include <asm/types.h>
34 #include <linux/ctype.h>
35 #include <linux/mutex.h>
37 #include <linux/file.h>
38 #include <linux/proc_fs.h>
39 #include <linux/init.h>
41 #include <linux/memcontrol.h>
42 #include <linux/mm_inline.h>
43 #include <linux/slab.h>
44 #include <linux/random.h>
45 #include <linux/reboot.h>
46 #include <linux/notifier.h>
47 #include <linux/kthread.h>
49 #define __KERNEL_SYSCALLS__
50 #include <linux/unistd.h>
51 #include <linux/vmalloc.h>
53 #include <linux/drbd_limits.h>
55 #include "drbd_req.h" /* only for _req_mod in tl_release and tl_clear */
59 static DEFINE_MUTEX(drbd_main_mutex);
60 int drbdd_init(struct drbd_thread *);
61 int drbd_worker(struct drbd_thread *);
62 int drbd_asender(struct drbd_thread *);
65 static int drbd_open(struct block_device *bdev, fmode_t mode);
66 static int drbd_release(struct gendisk *gd, fmode_t mode);
67 static int w_md_sync(struct drbd_work *w, int unused);
68 static void md_sync_timer_fn(unsigned long data);
69 static int w_bitmap_io(struct drbd_work *w, int unused);
70 static int w_go_diskless(struct drbd_work *w, int unused);
72 MODULE_AUTHOR("Philipp Reisner <phil@linbit.com>, "
73 "Lars Ellenberg <lars@linbit.com>");
74 MODULE_DESCRIPTION("drbd - Distributed Replicated Block Device v" REL_VERSION);
75 MODULE_VERSION(REL_VERSION);
76 MODULE_LICENSE("GPL");
77 MODULE_PARM_DESC(minor_count, "Approximate number of drbd devices ("
78 __stringify(DRBD_MINOR_COUNT_MIN) "-" __stringify(DRBD_MINOR_COUNT_MAX) ")");
79 MODULE_ALIAS_BLOCKDEV_MAJOR(DRBD_MAJOR);
81 #include <linux/moduleparam.h>
82 /* allow_open_on_secondary */
83 MODULE_PARM_DESC(allow_oos, "DONT USE!");
84 /* thanks to these macros, if compiled into the kernel (not-module),
85 * this becomes the boot parameter drbd.minor_count */
86 module_param(minor_count, uint, 0444);
87 module_param(disable_sendpage, bool, 0644);
88 module_param(allow_oos, bool, 0);
89 module_param(proc_details, int, 0644);
91 #ifdef CONFIG_DRBD_FAULT_INJECTION
94 static int fault_count;
96 /* bitmap of enabled faults */
97 module_param(enable_faults, int, 0664);
98 /* fault rate % value - applies to all enabled faults */
99 module_param(fault_rate, int, 0664);
100 /* count of faults inserted */
101 module_param(fault_count, int, 0664);
102 /* bitmap of devices to insert faults on */
103 module_param(fault_devs, int, 0644);
106 /* module parameter, defined */
107 unsigned int minor_count = DRBD_MINOR_COUNT_DEF;
108 int disable_sendpage;
110 int proc_details; /* Detail level in proc drbd*/
112 /* Module parameter for setting the user mode helper program
113 * to run. Default is /sbin/drbdadm */
114 char usermode_helper[80] = "/sbin/drbdadm";
116 module_param_string(usermode_helper, usermode_helper, sizeof(usermode_helper), 0644);
118 /* in 2.6.x, our device mapping and config info contains our virtual gendisks
119 * as member "struct gendisk *vdisk;"
122 struct list_head drbd_tconns; /* list of struct drbd_tconn */
123 DEFINE_MUTEX(drbd_cfg_mutex);
125 struct kmem_cache *drbd_request_cache;
126 struct kmem_cache *drbd_ee_cache; /* peer requests */
127 struct kmem_cache *drbd_bm_ext_cache; /* bitmap extents */
128 struct kmem_cache *drbd_al_ext_cache; /* activity log extents */
129 mempool_t *drbd_request_mempool;
130 mempool_t *drbd_ee_mempool;
131 mempool_t *drbd_md_io_page_pool;
132 struct bio_set *drbd_md_io_bio_set;
134 /* I do not use a standard mempool, because:
135 1) I want to hand out the pre-allocated objects first.
136 2) I want to be able to interrupt sleeping allocation with a signal.
137 Note: This is a single linked list, the next pointer is the private
138 member of struct page.
140 struct page *drbd_pp_pool;
141 spinlock_t drbd_pp_lock;
143 wait_queue_head_t drbd_pp_wait;
145 DEFINE_RATELIMIT_STATE(drbd_ratelimit_state, 5 * HZ, 5);
147 static const struct block_device_operations drbd_ops = {
148 .owner = THIS_MODULE,
150 .release = drbd_release,
153 static void bio_destructor_drbd(struct bio *bio)
155 bio_free(bio, drbd_md_io_bio_set);
158 struct bio *bio_alloc_drbd(gfp_t gfp_mask)
162 if (!drbd_md_io_bio_set)
163 return bio_alloc(gfp_mask, 1);
165 bio = bio_alloc_bioset(gfp_mask, 1, drbd_md_io_bio_set);
168 bio->bi_destructor = bio_destructor_drbd;
173 /* When checking with sparse, and this is an inline function, sparse will
174 give tons of false positives. When this is a real functions sparse works.
176 int _get_ldev_if_state(struct drbd_conf *mdev, enum drbd_disk_state mins)
180 atomic_inc(&mdev->local_cnt);
181 io_allowed = (mdev->state.disk >= mins);
183 if (atomic_dec_and_test(&mdev->local_cnt))
184 wake_up(&mdev->misc_wait);
192 * DOC: The transfer log
194 * The transfer log is a single linked list of &struct drbd_tl_epoch objects.
195 * mdev->tconn->newest_tle points to the head, mdev->tconn->oldest_tle points to the tail
196 * of the list. There is always at least one &struct drbd_tl_epoch object.
198 * Each &struct drbd_tl_epoch has a circular double linked list of requests
201 static int tl_init(struct drbd_tconn *tconn)
203 struct drbd_tl_epoch *b;
205 /* during device minor initialization, we may well use GFP_KERNEL */
206 b = kmalloc(sizeof(struct drbd_tl_epoch), GFP_KERNEL);
209 INIT_LIST_HEAD(&b->requests);
210 INIT_LIST_HEAD(&b->w.list);
214 b->w.cb = NULL; /* if this is != NULL, we need to dec_ap_pending in tl_clear */
216 tconn->oldest_tle = b;
217 tconn->newest_tle = b;
218 INIT_LIST_HEAD(&tconn->out_of_sequence_requests);
223 static void tl_cleanup(struct drbd_tconn *tconn)
225 if (tconn->oldest_tle != tconn->newest_tle)
226 conn_err(tconn, "ASSERT FAILED: oldest_tle == newest_tle\n");
227 if (!list_empty(&tconn->out_of_sequence_requests))
228 conn_err(tconn, "ASSERT FAILED: list_empty(out_of_sequence_requests)\n");
229 kfree(tconn->oldest_tle);
230 tconn->oldest_tle = NULL;
231 kfree(tconn->unused_spare_tle);
232 tconn->unused_spare_tle = NULL;
236 * _tl_add_barrier() - Adds a barrier to the transfer log
237 * @mdev: DRBD device.
238 * @new: Barrier to be added before the current head of the TL.
240 * The caller must hold the req_lock.
242 void _tl_add_barrier(struct drbd_tconn *tconn, struct drbd_tl_epoch *new)
244 struct drbd_tl_epoch *newest_before;
246 INIT_LIST_HEAD(&new->requests);
247 INIT_LIST_HEAD(&new->w.list);
248 new->w.cb = NULL; /* if this is != NULL, we need to dec_ap_pending in tl_clear */
252 newest_before = tconn->newest_tle;
253 /* never send a barrier number == 0, because that is special-cased
254 * when using TCQ for our write ordering code */
255 new->br_number = (newest_before->br_number+1) ?: 1;
256 if (tconn->newest_tle != new) {
257 tconn->newest_tle->next = new;
258 tconn->newest_tle = new;
263 * tl_release() - Free or recycle the oldest &struct drbd_tl_epoch object of the TL
264 * @mdev: DRBD device.
265 * @barrier_nr: Expected identifier of the DRBD write barrier packet.
266 * @set_size: Expected number of requests before that barrier.
268 * In case the passed barrier_nr or set_size does not match the oldest
269 * &struct drbd_tl_epoch objects this function will cause a termination
272 void tl_release(struct drbd_tconn *tconn, unsigned int barrier_nr,
273 unsigned int set_size)
275 struct drbd_conf *mdev;
276 struct drbd_tl_epoch *b, *nob; /* next old barrier */
277 struct list_head *le, *tle;
278 struct drbd_request *r;
280 spin_lock_irq(&tconn->req_lock);
282 b = tconn->oldest_tle;
284 /* first some paranoia code */
286 conn_err(tconn, "BAD! BarrierAck #%u received, but no epoch in tl!?\n",
290 if (b->br_number != barrier_nr) {
291 conn_err(tconn, "BAD! BarrierAck #%u received, expected #%u!\n",
292 barrier_nr, b->br_number);
295 if (b->n_writes != set_size) {
296 conn_err(tconn, "BAD! BarrierAck #%u received with n_writes=%u, expected n_writes=%u!\n",
297 barrier_nr, set_size, b->n_writes);
301 /* Clean up list of requests processed during current epoch */
302 list_for_each_safe(le, tle, &b->requests) {
303 r = list_entry(le, struct drbd_request, tl_requests);
304 _req_mod(r, BARRIER_ACKED);
306 /* There could be requests on the list waiting for completion
307 of the write to the local disk. To avoid corruptions of
308 slab's data structures we have to remove the lists head.
310 Also there could have been a barrier ack out of sequence, overtaking
311 the write acks - which would be a bug and violating write ordering.
312 To not deadlock in case we lose connection while such requests are
313 still pending, we need some way to find them for the
314 _req_mode(CONNECTION_LOST_WHILE_PENDING).
316 These have been list_move'd to the out_of_sequence_requests list in
317 _req_mod(, BARRIER_ACKED) above.
319 list_del_init(&b->requests);
323 if (test_and_clear_bit(CREATE_BARRIER, &mdev->flags)) {
324 _tl_add_barrier(tconn, b);
326 tconn->oldest_tle = nob;
327 /* if nob == NULL b was the only barrier, and becomes the new
328 barrier. Therefore tconn->oldest_tle points already to b */
330 D_ASSERT(nob != NULL);
331 tconn->oldest_tle = nob;
335 spin_unlock_irq(&tconn->req_lock);
336 dec_ap_pending(mdev);
341 spin_unlock_irq(&tconn->req_lock);
342 conn_request_state(tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD);
347 * _tl_restart() - Walks the transfer log, and applies an action to all requests
348 * @mdev: DRBD device.
349 * @what: The action/event to perform with all request objects
351 * @what might be one of CONNECTION_LOST_WHILE_PENDING, RESEND, FAIL_FROZEN_DISK_IO,
352 * RESTART_FROZEN_DISK_IO.
354 void _tl_restart(struct drbd_tconn *tconn, enum drbd_req_event what)
356 struct drbd_tl_epoch *b, *tmp, **pn;
357 struct list_head *le, *tle, carry_reads;
358 struct drbd_request *req;
359 int rv, n_writes, n_reads;
361 b = tconn->oldest_tle;
362 pn = &tconn->oldest_tle;
366 INIT_LIST_HEAD(&carry_reads);
367 list_for_each_safe(le, tle, &b->requests) {
368 req = list_entry(le, struct drbd_request, tl_requests);
369 rv = _req_mod(req, what);
371 n_writes += (rv & MR_WRITE) >> MR_WRITE_SHIFT;
372 n_reads += (rv & MR_READ) >> MR_READ_SHIFT;
377 if (what == RESEND) {
378 b->n_writes = n_writes;
379 if (b->w.cb == NULL) {
380 b->w.cb = w_send_barrier;
381 inc_ap_pending(b->w.mdev);
382 set_bit(CREATE_BARRIER, &b->w.mdev->flags);
385 drbd_queue_work(&tconn->data.work, &b->w);
390 list_add(&carry_reads, &b->requests);
391 /* there could still be requests on that ring list,
392 * in case local io is still pending */
393 list_del(&b->requests);
395 /* dec_ap_pending corresponding to queue_barrier.
396 * the newest barrier may not have been queued yet,
397 * in which case w.cb is still NULL. */
399 dec_ap_pending(b->w.mdev);
401 if (b == tconn->newest_tle) {
402 /* recycle, but reinit! */
404 conn_err(tconn, "ASSERT FAILED tmp == NULL");
405 INIT_LIST_HEAD(&b->requests);
406 list_splice(&carry_reads, &b->requests);
407 INIT_LIST_HEAD(&b->w.list);
409 b->br_number = net_random();
419 list_splice(&carry_reads, &b->requests);
425 * tl_clear() - Clears all requests and &struct drbd_tl_epoch objects out of the TL
426 * @mdev: DRBD device.
428 * This is called after the connection to the peer was lost. The storage covered
429 * by the requests on the transfer gets marked as our of sync. Called from the
430 * receiver thread and the worker thread.
432 void tl_clear(struct drbd_tconn *tconn)
434 struct drbd_conf *mdev;
435 struct list_head *le, *tle;
436 struct drbd_request *r;
439 spin_lock_irq(&tconn->req_lock);
441 _tl_restart(tconn, CONNECTION_LOST_WHILE_PENDING);
443 /* we expect this list to be empty. */
444 if (!list_empty(&tconn->out_of_sequence_requests))
445 conn_err(tconn, "ASSERT FAILED list_empty(&out_of_sequence_requests)\n");
447 /* but just in case, clean it up anyways! */
448 list_for_each_safe(le, tle, &tconn->out_of_sequence_requests) {
449 r = list_entry(le, struct drbd_request, tl_requests);
450 /* It would be nice to complete outside of spinlock.
451 * But this is easier for now. */
452 _req_mod(r, CONNECTION_LOST_WHILE_PENDING);
455 /* ensure bit indicating barrier is required is clear */
456 idr_for_each_entry(&tconn->volumes, mdev, vnr)
457 clear_bit(CREATE_BARRIER, &mdev->flags);
459 spin_unlock_irq(&tconn->req_lock);
462 void tl_restart(struct drbd_tconn *tconn, enum drbd_req_event what)
464 spin_lock_irq(&tconn->req_lock);
465 _tl_restart(tconn, what);
466 spin_unlock_irq(&tconn->req_lock);
469 static int drbd_thread_setup(void *arg)
471 struct drbd_thread *thi = (struct drbd_thread *) arg;
472 struct drbd_tconn *tconn = thi->tconn;
476 snprintf(current->comm, sizeof(current->comm), "drbd_%c_%s",
477 thi->name[0], thi->tconn->name);
480 retval = thi->function(thi);
482 spin_lock_irqsave(&thi->t_lock, flags);
484 /* if the receiver has been "EXITING", the last thing it did
485 * was set the conn state to "StandAlone",
486 * if now a re-connect request comes in, conn state goes C_UNCONNECTED,
487 * and receiver thread will be "started".
488 * drbd_thread_start needs to set "RESTARTING" in that case.
489 * t_state check and assignment needs to be within the same spinlock,
490 * so either thread_start sees EXITING, and can remap to RESTARTING,
491 * or thread_start see NONE, and can proceed as normal.
494 if (thi->t_state == RESTARTING) {
495 conn_info(tconn, "Restarting %s thread\n", thi->name);
496 thi->t_state = RUNNING;
497 spin_unlock_irqrestore(&thi->t_lock, flags);
504 complete(&thi->stop);
505 spin_unlock_irqrestore(&thi->t_lock, flags);
507 conn_info(tconn, "Terminating %s\n", current->comm);
509 /* Release mod reference taken when thread was started */
510 module_put(THIS_MODULE);
514 static void drbd_thread_init(struct drbd_tconn *tconn, struct drbd_thread *thi,
515 int (*func) (struct drbd_thread *), char *name)
517 spin_lock_init(&thi->t_lock);
520 thi->function = func;
522 strncpy(thi->name, name, ARRAY_SIZE(thi->name));
525 int drbd_thread_start(struct drbd_thread *thi)
527 struct drbd_tconn *tconn = thi->tconn;
528 struct task_struct *nt;
531 /* is used from state engine doing drbd_thread_stop_nowait,
532 * while holding the req lock irqsave */
533 spin_lock_irqsave(&thi->t_lock, flags);
535 switch (thi->t_state) {
537 conn_info(tconn, "Starting %s thread (from %s [%d])\n",
538 thi->name, current->comm, current->pid);
540 /* Get ref on module for thread - this is released when thread exits */
541 if (!try_module_get(THIS_MODULE)) {
542 conn_err(tconn, "Failed to get module reference in drbd_thread_start\n");
543 spin_unlock_irqrestore(&thi->t_lock, flags);
547 init_completion(&thi->stop);
548 thi->reset_cpu_mask = 1;
549 thi->t_state = RUNNING;
550 spin_unlock_irqrestore(&thi->t_lock, flags);
551 flush_signals(current); /* otherw. may get -ERESTARTNOINTR */
553 nt = kthread_create(drbd_thread_setup, (void *) thi,
554 "drbd_%c_%s", thi->name[0], thi->tconn->name);
557 conn_err(tconn, "Couldn't start thread\n");
559 module_put(THIS_MODULE);
562 spin_lock_irqsave(&thi->t_lock, flags);
564 thi->t_state = RUNNING;
565 spin_unlock_irqrestore(&thi->t_lock, flags);
569 thi->t_state = RESTARTING;
570 conn_info(tconn, "Restarting %s thread (from %s [%d])\n",
571 thi->name, current->comm, current->pid);
576 spin_unlock_irqrestore(&thi->t_lock, flags);
584 void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait)
588 enum drbd_thread_state ns = restart ? RESTARTING : EXITING;
590 /* may be called from state engine, holding the req lock irqsave */
591 spin_lock_irqsave(&thi->t_lock, flags);
593 if (thi->t_state == NONE) {
594 spin_unlock_irqrestore(&thi->t_lock, flags);
596 drbd_thread_start(thi);
600 if (thi->t_state != ns) {
601 if (thi->task == NULL) {
602 spin_unlock_irqrestore(&thi->t_lock, flags);
608 init_completion(&thi->stop);
609 if (thi->task != current)
610 force_sig(DRBD_SIGKILL, thi->task);
613 spin_unlock_irqrestore(&thi->t_lock, flags);
616 wait_for_completion(&thi->stop);
619 static struct drbd_thread *drbd_task_to_thread(struct drbd_tconn *tconn, struct task_struct *task)
621 struct drbd_thread *thi =
622 task == tconn->receiver.task ? &tconn->receiver :
623 task == tconn->asender.task ? &tconn->asender :
624 task == tconn->worker.task ? &tconn->worker : NULL;
629 char *drbd_task_to_thread_name(struct drbd_tconn *tconn, struct task_struct *task)
631 struct drbd_thread *thi = drbd_task_to_thread(tconn, task);
632 return thi ? thi->name : task->comm;
635 int conn_lowest_minor(struct drbd_tconn *tconn)
638 struct drbd_conf *mdev;
640 mdev = idr_get_next(&tconn->volumes, &vnr);
643 return mdev_to_minor(mdev);
648 * drbd_calc_cpu_mask() - Generate CPU masks, spread over all CPUs
649 * @mdev: DRBD device.
651 * Forces all threads of a device onto the same CPU. This is beneficial for
652 * DRBD's performance. May be overwritten by user's configuration.
654 void drbd_calc_cpu_mask(struct drbd_tconn *tconn)
659 if (cpumask_weight(tconn->cpu_mask))
662 ord = conn_lowest_minor(tconn) % cpumask_weight(cpu_online_mask);
663 for_each_online_cpu(cpu) {
665 cpumask_set_cpu(cpu, tconn->cpu_mask);
669 /* should not be reached */
670 cpumask_setall(tconn->cpu_mask);
674 * drbd_thread_current_set_cpu() - modifies the cpu mask of the _current_ thread
675 * @mdev: DRBD device.
676 * @thi: drbd_thread object
678 * call in the "main loop" of _all_ threads, no need for any mutex, current won't die
681 void drbd_thread_current_set_cpu(struct drbd_thread *thi)
683 struct task_struct *p = current;
685 if (!thi->reset_cpu_mask)
687 thi->reset_cpu_mask = 0;
688 set_cpus_allowed_ptr(p, thi->tconn->cpu_mask);
692 static void prepare_header80(struct p_header80 *h, enum drbd_packet cmd, int size)
694 h->magic = cpu_to_be32(DRBD_MAGIC);
695 h->command = cpu_to_be16(cmd);
696 h->length = cpu_to_be16(size);
699 static void prepare_header95(struct p_header95 *h, enum drbd_packet cmd, int size)
701 h->magic = cpu_to_be16(DRBD_MAGIC_BIG);
702 h->command = cpu_to_be16(cmd);
703 h->length = cpu_to_be32(size);
706 static void _prepare_header(struct drbd_tconn *tconn, int vnr, struct p_header *h,
707 enum drbd_packet cmd, int size)
709 if (tconn->agreed_pro_version >= 100 || size > DRBD_MAX_SIZE_H80_PACKET)
710 prepare_header95(&h->h95, cmd, size);
712 prepare_header80(&h->h80, cmd, size);
715 static void prepare_header(struct drbd_conf *mdev, struct p_header *h,
716 enum drbd_packet cmd, int size)
718 _prepare_header(mdev->tconn, mdev->vnr, h, cmd, size);
721 /* the appropriate socket mutex must be held already */
722 int _conn_send_cmd(struct drbd_tconn *tconn, int vnr, struct socket *sock,
723 enum drbd_packet cmd, struct p_header *h, size_t size,
728 _prepare_header(tconn, vnr, h, cmd, size - sizeof(struct p_header));
729 err = drbd_send_all(tconn, sock, h, size, msg_flags);
730 if (err && !signal_pending(current))
731 conn_warn(tconn, "short send %s size=%d\n",
732 cmdname(cmd), (int)size);
736 /* don't pass the socket. we may only look at it
737 * when we hold the appropriate socket mutex.
739 int conn_send_cmd(struct drbd_tconn *tconn, int vnr, struct drbd_socket *sock,
740 enum drbd_packet cmd, struct p_header *h, size_t size)
744 mutex_lock(&sock->mutex);
746 err = _conn_send_cmd(tconn, vnr, sock->socket, cmd, h, size, 0);
747 mutex_unlock(&sock->mutex);
751 int conn_send_cmd2(struct drbd_tconn *tconn, enum drbd_packet cmd, char *data,
757 prepare_header80(&h, cmd, size);
758 err = drbd_get_data_sock(tconn);
760 err = drbd_send_all(tconn, tconn->data.socket, &h, sizeof(h), 0);
762 err = drbd_send_all(tconn, tconn->data.socket, data, size, 0);
763 drbd_put_data_sock(tconn);
768 int drbd_send_sync_param(struct drbd_conf *mdev)
770 struct p_rs_param_95 *p;
773 const int apv = mdev->tconn->agreed_pro_version;
775 size = apv <= 87 ? sizeof(struct p_rs_param)
776 : apv == 88 ? sizeof(struct p_rs_param)
777 + strlen(mdev->tconn->net_conf->verify_alg) + 1
778 : apv <= 94 ? sizeof(struct p_rs_param_89)
779 : /* apv >= 95 */ sizeof(struct p_rs_param_95);
781 /* used from admin command context and receiver/worker context.
782 * to avoid kmalloc, grab the socket right here,
783 * then use the pre-allocated sbuf there */
784 mutex_lock(&mdev->tconn->data.mutex);
785 sock = mdev->tconn->data.socket;
787 if (likely(sock != NULL)) {
788 enum drbd_packet cmd =
789 apv >= 89 ? P_SYNC_PARAM89 : P_SYNC_PARAM;
791 p = &mdev->tconn->data.sbuf.rs_param_95;
793 /* initialize verify_alg and csums_alg */
794 memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX);
796 if (get_ldev(mdev)) {
797 p->rate = cpu_to_be32(mdev->ldev->dc.resync_rate);
798 p->c_plan_ahead = cpu_to_be32(mdev->ldev->dc.c_plan_ahead);
799 p->c_delay_target = cpu_to_be32(mdev->ldev->dc.c_delay_target);
800 p->c_fill_target = cpu_to_be32(mdev->ldev->dc.c_fill_target);
801 p->c_max_rate = cpu_to_be32(mdev->ldev->dc.c_max_rate);
804 p->rate = cpu_to_be32(DRBD_RATE_DEF);
805 p->c_plan_ahead = cpu_to_be32(DRBD_C_PLAN_AHEAD_DEF);
806 p->c_delay_target = cpu_to_be32(DRBD_C_DELAY_TARGET_DEF);
807 p->c_fill_target = cpu_to_be32(DRBD_C_FILL_TARGET_DEF);
808 p->c_max_rate = cpu_to_be32(DRBD_C_MAX_RATE_DEF);
812 strcpy(p->verify_alg, mdev->tconn->net_conf->verify_alg);
814 strcpy(p->csums_alg, mdev->tconn->net_conf->csums_alg);
816 err = _drbd_send_cmd(mdev, sock, cmd, &p->head, size, 0);
820 mutex_unlock(&mdev->tconn->data.mutex);
825 int drbd_send_protocol(struct drbd_tconn *tconn)
827 struct p_protocol *p;
830 size = sizeof(struct p_protocol);
832 if (tconn->agreed_pro_version >= 87)
833 size += strlen(tconn->net_conf->integrity_alg) + 1;
835 /* we must not recurse into our own queue,
836 * as that is blocked during handshake */
837 p = kmalloc(size, GFP_NOIO);
841 p->protocol = cpu_to_be32(tconn->net_conf->wire_protocol);
842 p->after_sb_0p = cpu_to_be32(tconn->net_conf->after_sb_0p);
843 p->after_sb_1p = cpu_to_be32(tconn->net_conf->after_sb_1p);
844 p->after_sb_2p = cpu_to_be32(tconn->net_conf->after_sb_2p);
845 p->two_primaries = cpu_to_be32(tconn->net_conf->two_primaries);
848 if (tconn->net_conf->want_lose)
850 if (tconn->net_conf->dry_run) {
851 if (tconn->agreed_pro_version >= 92)
854 conn_err(tconn, "--dry-run is not supported by peer");
859 p->conn_flags = cpu_to_be32(cf);
861 if (tconn->agreed_pro_version >= 87)
862 strcpy(p->integrity_alg, tconn->net_conf->integrity_alg);
864 err = conn_send_cmd2(tconn, P_PROTOCOL, p->head.payload, size - sizeof(struct p_header));
869 int _drbd_send_uuids(struct drbd_conf *mdev, u64 uuid_flags)
874 if (!get_ldev_if_state(mdev, D_NEGOTIATING))
877 for (i = UI_CURRENT; i < UI_SIZE; i++)
878 p.uuid[i] = mdev->ldev ? cpu_to_be64(mdev->ldev->md.uuid[i]) : 0;
880 mdev->comm_bm_set = drbd_bm_total_weight(mdev);
881 p.uuid[UI_SIZE] = cpu_to_be64(mdev->comm_bm_set);
882 uuid_flags |= mdev->tconn->net_conf->want_lose ? 1 : 0;
883 uuid_flags |= test_bit(CRASHED_PRIMARY, &mdev->flags) ? 2 : 0;
884 uuid_flags |= mdev->new_state_tmp.disk == D_INCONSISTENT ? 4 : 0;
885 p.uuid[UI_FLAGS] = cpu_to_be64(uuid_flags);
889 return drbd_send_cmd(mdev, &mdev->tconn->data, P_UUIDS, &p.head, sizeof(p));
892 int drbd_send_uuids(struct drbd_conf *mdev)
894 return _drbd_send_uuids(mdev, 0);
897 int drbd_send_uuids_skip_initial_sync(struct drbd_conf *mdev)
899 return _drbd_send_uuids(mdev, 8);
902 void drbd_print_uuids(struct drbd_conf *mdev, const char *text)
904 if (get_ldev_if_state(mdev, D_NEGOTIATING)) {
905 u64 *uuid = mdev->ldev->md.uuid;
906 dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX\n",
908 (unsigned long long)uuid[UI_CURRENT],
909 (unsigned long long)uuid[UI_BITMAP],
910 (unsigned long long)uuid[UI_HISTORY_START],
911 (unsigned long long)uuid[UI_HISTORY_END]);
914 dev_info(DEV, "%s effective data uuid: %016llX\n",
916 (unsigned long long)mdev->ed_uuid);
920 void drbd_gen_and_send_sync_uuid(struct drbd_conf *mdev)
925 D_ASSERT(mdev->state.disk == D_UP_TO_DATE);
927 uuid = mdev->ldev->md.uuid[UI_BITMAP] + UUID_NEW_BM_OFFSET;
928 drbd_uuid_set(mdev, UI_BITMAP, uuid);
929 drbd_print_uuids(mdev, "updated sync UUID");
931 p.uuid = cpu_to_be64(uuid);
933 drbd_send_cmd(mdev, &mdev->tconn->data, P_SYNC_UUID, &p.head, sizeof(p));
936 int drbd_send_sizes(struct drbd_conf *mdev, int trigger_reply, enum dds_flags flags)
939 sector_t d_size, u_size;
940 int q_order_type, max_bio_size;
942 if (get_ldev_if_state(mdev, D_NEGOTIATING)) {
943 D_ASSERT(mdev->ldev->backing_bdev);
944 d_size = drbd_get_max_capacity(mdev->ldev);
945 u_size = mdev->ldev->dc.disk_size;
946 q_order_type = drbd_queue_order_type(mdev);
947 max_bio_size = queue_max_hw_sectors(mdev->ldev->backing_bdev->bd_disk->queue) << 9;
948 max_bio_size = min_t(int, max_bio_size, DRBD_MAX_BIO_SIZE);
953 q_order_type = QUEUE_ORDERED_NONE;
954 max_bio_size = DRBD_MAX_BIO_SIZE; /* ... multiple BIOs per peer_request */
957 p.d_size = cpu_to_be64(d_size);
958 p.u_size = cpu_to_be64(u_size);
959 p.c_size = cpu_to_be64(trigger_reply ? 0 : drbd_get_capacity(mdev->this_bdev));
960 p.max_bio_size = cpu_to_be32(max_bio_size);
961 p.queue_order_type = cpu_to_be16(q_order_type);
962 p.dds_flags = cpu_to_be16(flags);
964 return drbd_send_cmd(mdev, &mdev->tconn->data, P_SIZES, &p.head, sizeof(p));
968 * drbd_send_state() - Sends the drbd state to the peer
969 * @mdev: DRBD device.
971 int drbd_send_state(struct drbd_conf *mdev)
977 mutex_lock(&mdev->tconn->data.mutex);
979 p.state = cpu_to_be32(mdev->state.i); /* Within the send mutex */
980 sock = mdev->tconn->data.socket;
982 if (likely(sock != NULL))
983 err = _drbd_send_cmd(mdev, sock, P_STATE, &p.head, sizeof(p), 0);
985 mutex_unlock(&mdev->tconn->data.mutex);
990 int _conn_send_state_req(struct drbd_tconn *tconn, int vnr, enum drbd_packet cmd,
991 union drbd_state mask, union drbd_state val)
993 struct p_req_state p;
995 p.mask = cpu_to_be32(mask.i);
996 p.val = cpu_to_be32(val.i);
998 return conn_send_cmd(tconn, vnr, &tconn->data, cmd, &p.head, sizeof(p));
1001 void drbd_send_sr_reply(struct drbd_conf *mdev, enum drbd_state_rv retcode)
1003 struct p_req_state_reply p;
1005 p.retcode = cpu_to_be32(retcode);
1007 drbd_send_cmd(mdev, &mdev->tconn->meta, P_STATE_CHG_REPLY, &p.head, sizeof(p));
1010 int conn_send_sr_reply(struct drbd_tconn *tconn, enum drbd_state_rv retcode)
1012 struct p_req_state_reply p;
1013 enum drbd_packet cmd = tconn->agreed_pro_version < 100 ? P_STATE_CHG_REPLY : P_CONN_ST_CHG_REPLY;
1015 p.retcode = cpu_to_be32(retcode);
1017 return !conn_send_cmd(tconn, 0, &tconn->meta, cmd, &p.head, sizeof(p));
1020 int fill_bitmap_rle_bits(struct drbd_conf *mdev,
1021 struct p_compressed_bm *p,
1022 struct bm_xfer_ctx *c)
1024 struct bitstream bs;
1025 unsigned long plain_bits;
1032 /* may we use this feature? */
1033 if ((mdev->tconn->net_conf->use_rle == 0) ||
1034 (mdev->tconn->agreed_pro_version < 90))
1037 if (c->bit_offset >= c->bm_bits)
1038 return 0; /* nothing to do. */
1040 /* use at most thus many bytes */
1041 bitstream_init(&bs, p->code, BM_PACKET_VLI_BYTES_MAX, 0);
1042 memset(p->code, 0, BM_PACKET_VLI_BYTES_MAX);
1043 /* plain bits covered in this code string */
1046 /* p->encoding & 0x80 stores whether the first run length is set.
1047 * bit offset is implicit.
1048 * start with toggle == 2 to be able to tell the first iteration */
1051 /* see how much plain bits we can stuff into one packet
1052 * using RLE and VLI. */
1054 tmp = (toggle == 0) ? _drbd_bm_find_next_zero(mdev, c->bit_offset)
1055 : _drbd_bm_find_next(mdev, c->bit_offset);
1058 rl = tmp - c->bit_offset;
1060 if (toggle == 2) { /* first iteration */
1062 /* the first checked bit was set,
1063 * store start value, */
1064 DCBP_set_start(p, 1);
1065 /* but skip encoding of zero run length */
1069 DCBP_set_start(p, 0);
1072 /* paranoia: catch zero runlength.
1073 * can only happen if bitmap is modified while we scan it. */
1075 dev_err(DEV, "unexpected zero runlength while encoding bitmap "
1076 "t:%u bo:%lu\n", toggle, c->bit_offset);
1080 bits = vli_encode_bits(&bs, rl);
1081 if (bits == -ENOBUFS) /* buffer full */
1084 dev_err(DEV, "error while encoding bitmap: %d\n", bits);
1090 c->bit_offset = tmp;
1091 } while (c->bit_offset < c->bm_bits);
1093 len = bs.cur.b - p->code + !!bs.cur.bit;
1095 if (plain_bits < (len << 3)) {
1096 /* incompressible with this method.
1097 * we need to rewind both word and bit position. */
1098 c->bit_offset -= plain_bits;
1099 bm_xfer_ctx_bit_to_word_offset(c);
1100 c->bit_offset = c->word_offset * BITS_PER_LONG;
1104 /* RLE + VLI was able to compress it just fine.
1105 * update c->word_offset. */
1106 bm_xfer_ctx_bit_to_word_offset(c);
1108 /* store pad_bits */
1109 DCBP_set_pad_bits(p, (8 - bs.cur.bit) & 0x7);
1115 * send_bitmap_rle_or_plain
1117 * Return 0 when done, 1 when another iteration is needed, and a negative error
1118 * code upon failure.
1121 send_bitmap_rle_or_plain(struct drbd_conf *mdev,
1122 struct p_header *h, struct bm_xfer_ctx *c)
1124 struct p_compressed_bm *p = (void*)h;
1125 unsigned long num_words;
1129 len = fill_bitmap_rle_bits(mdev, p, c);
1135 DCBP_set_code(p, RLE_VLI_Bits);
1136 ok = !_drbd_send_cmd(mdev, mdev->tconn->data.socket, P_COMPRESSED_BITMAP, h,
1137 sizeof(*p) + len, 0);
1140 c->bytes[0] += sizeof(*p) + len;
1142 if (c->bit_offset >= c->bm_bits)
1145 /* was not compressible.
1146 * send a buffer full of plain text bits instead. */
1147 num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset);
1148 len = num_words * sizeof(long);
1150 drbd_bm_get_lel(mdev, c->word_offset, num_words, (unsigned long*)h->payload);
1151 ok = !_drbd_send_cmd(mdev, mdev->tconn->data.socket, P_BITMAP,
1152 h, sizeof(struct p_header80) + len, 0);
1153 c->word_offset += num_words;
1154 c->bit_offset = c->word_offset * BITS_PER_LONG;
1157 c->bytes[1] += sizeof(struct p_header80) + len;
1159 if (c->bit_offset > c->bm_bits)
1160 c->bit_offset = c->bm_bits;
1164 INFO_bm_xfer_stats(mdev, "send", c);
1172 /* See the comment at receive_bitmap() */
1173 int _drbd_send_bitmap(struct drbd_conf *mdev)
1175 struct bm_xfer_ctx c;
1179 if (!expect(mdev->bitmap))
1182 /* maybe we should use some per thread scratch page,
1183 * and allocate that during initial device creation? */
1184 p = (struct p_header *) __get_free_page(GFP_NOIO);
1186 dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__);
1190 if (get_ldev(mdev)) {
1191 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
1192 dev_info(DEV, "Writing the whole bitmap, MDF_FullSync was set.\n");
1193 drbd_bm_set_all(mdev);
1194 if (drbd_bm_write(mdev)) {
1195 /* write_bm did fail! Leave full sync flag set in Meta P_DATA
1196 * but otherwise process as per normal - need to tell other
1197 * side that a full resync is required! */
1198 dev_err(DEV, "Failed to write bitmap to disk!\n");
1200 drbd_md_clear_flag(mdev, MDF_FULL_SYNC);
1207 c = (struct bm_xfer_ctx) {
1208 .bm_bits = drbd_bm_bits(mdev),
1209 .bm_words = drbd_bm_words(mdev),
1213 err = send_bitmap_rle_or_plain(mdev, p, &c);
1216 free_page((unsigned long) p);
1220 int drbd_send_bitmap(struct drbd_conf *mdev)
1224 if (drbd_get_data_sock(mdev->tconn))
1226 err = !_drbd_send_bitmap(mdev);
1227 drbd_put_data_sock(mdev->tconn);
1230 void drbd_send_b_ack(struct drbd_conf *mdev, u32 barrier_nr, u32 set_size)
1232 struct p_barrier_ack p;
1234 p.barrier = barrier_nr;
1235 p.set_size = cpu_to_be32(set_size);
1237 if (mdev->state.conn >= C_CONNECTED)
1238 drbd_send_cmd(mdev, &mdev->tconn->meta, P_BARRIER_ACK, &p.head, sizeof(p));
1242 * _drbd_send_ack() - Sends an ack packet
1243 * @mdev: DRBD device.
1244 * @cmd: Packet command code.
1245 * @sector: sector, needs to be in big endian byte order
1246 * @blksize: size in byte, needs to be in big endian byte order
1247 * @block_id: Id, big endian byte order
1249 static int _drbd_send_ack(struct drbd_conf *mdev, enum drbd_packet cmd,
1250 u64 sector, u32 blksize, u64 block_id)
1252 struct p_block_ack p;
1255 p.block_id = block_id;
1256 p.blksize = blksize;
1257 p.seq_num = cpu_to_be32(atomic_inc_return(&mdev->packet_seq));
1259 if (!mdev->tconn->meta.socket || mdev->state.conn < C_CONNECTED)
1261 return drbd_send_cmd(mdev, &mdev->tconn->meta, cmd, &p.head, sizeof(p));
1264 /* dp->sector and dp->block_id already/still in network byte order,
1265 * data_size is payload size according to dp->head,
1266 * and may need to be corrected for digest size. */
1267 int drbd_send_ack_dp(struct drbd_conf *mdev, enum drbd_packet cmd,
1268 struct p_data *dp, int data_size)
1270 data_size -= (mdev->tconn->agreed_pro_version >= 87 && mdev->tconn->integrity_r_tfm) ?
1271 crypto_hash_digestsize(mdev->tconn->integrity_r_tfm) : 0;
1272 return !_drbd_send_ack(mdev, cmd, dp->sector, cpu_to_be32(data_size),
1276 int drbd_send_ack_rp(struct drbd_conf *mdev, enum drbd_packet cmd,
1277 struct p_block_req *rp)
1279 return !_drbd_send_ack(mdev, cmd, rp->sector, rp->blksize, rp->block_id);
1283 * drbd_send_ack() - Sends an ack packet
1284 * @mdev: DRBD device
1285 * @cmd: packet command code
1286 * @peer_req: peer request
1288 int drbd_send_ack(struct drbd_conf *mdev, enum drbd_packet cmd,
1289 struct drbd_peer_request *peer_req)
1291 return _drbd_send_ack(mdev, cmd,
1292 cpu_to_be64(peer_req->i.sector),
1293 cpu_to_be32(peer_req->i.size),
1294 peer_req->block_id);
1297 /* This function misuses the block_id field to signal if the blocks
1298 * are is sync or not. */
1299 int drbd_send_ack_ex(struct drbd_conf *mdev, enum drbd_packet cmd,
1300 sector_t sector, int blksize, u64 block_id)
1302 return !_drbd_send_ack(mdev, cmd,
1303 cpu_to_be64(sector),
1304 cpu_to_be32(blksize),
1305 cpu_to_be64(block_id));
1308 int drbd_send_drequest(struct drbd_conf *mdev, int cmd,
1309 sector_t sector, int size, u64 block_id)
1312 struct p_block_req p;
1314 p.sector = cpu_to_be64(sector);
1315 p.block_id = block_id;
1316 p.blksize = cpu_to_be32(size);
1318 ok = !drbd_send_cmd(mdev, &mdev->tconn->data, cmd, &p.head, sizeof(p));
1322 int drbd_send_drequest_csum(struct drbd_conf *mdev, sector_t sector, int size,
1323 void *digest, int digest_size, enum drbd_packet cmd)
1326 struct p_block_req p;
1328 prepare_header(mdev, &p.head, cmd, sizeof(p) - sizeof(struct p_header) + digest_size);
1329 p.sector = cpu_to_be64(sector);
1330 p.block_id = ID_SYNCER /* unused */;
1331 p.blksize = cpu_to_be32(size);
1333 mutex_lock(&mdev->tconn->data.mutex);
1335 ok = (sizeof(p) == drbd_send(mdev->tconn, mdev->tconn->data.socket, &p, sizeof(p), 0));
1336 ok = ok && (digest_size == drbd_send(mdev->tconn, mdev->tconn->data.socket, digest, digest_size, 0));
1338 mutex_unlock(&mdev->tconn->data.mutex);
1343 int drbd_send_ov_request(struct drbd_conf *mdev, sector_t sector, int size)
1346 struct p_block_req p;
1348 p.sector = cpu_to_be64(sector);
1349 p.block_id = ID_SYNCER /* unused */;
1350 p.blksize = cpu_to_be32(size);
1352 ok = !drbd_send_cmd(mdev, &mdev->tconn->data, P_OV_REQUEST, &p.head, sizeof(p));
1356 /* called on sndtimeo
1357 * returns false if we should retry,
1358 * true if we think connection is dead
1360 static int we_should_drop_the_connection(struct drbd_tconn *tconn, struct socket *sock)
1363 /* long elapsed = (long)(jiffies - mdev->last_received); */
1365 drop_it = tconn->meta.socket == sock
1366 || !tconn->asender.task
1367 || get_t_state(&tconn->asender) != RUNNING
1368 || tconn->cstate < C_WF_REPORT_PARAMS;
1373 drop_it = !--tconn->ko_count;
1375 conn_err(tconn, "[%s/%d] sock_sendmsg time expired, ko = %u\n",
1376 current->comm, current->pid, tconn->ko_count);
1377 request_ping(tconn);
1380 return drop_it; /* && (mdev->state == R_PRIMARY) */;
1383 static void drbd_update_congested(struct drbd_tconn *tconn)
1385 struct sock *sk = tconn->data.socket->sk;
1386 if (sk->sk_wmem_queued > sk->sk_sndbuf * 4 / 5)
1387 set_bit(NET_CONGESTED, &tconn->flags);
1390 /* The idea of sendpage seems to be to put some kind of reference
1391 * to the page into the skb, and to hand it over to the NIC. In
1392 * this process get_page() gets called.
1394 * As soon as the page was really sent over the network put_page()
1395 * gets called by some part of the network layer. [ NIC driver? ]
1397 * [ get_page() / put_page() increment/decrement the count. If count
1398 * reaches 0 the page will be freed. ]
1400 * This works nicely with pages from FSs.
1401 * But this means that in protocol A we might signal IO completion too early!
1403 * In order not to corrupt data during a resync we must make sure
1404 * that we do not reuse our own buffer pages (EEs) to early, therefore
1405 * we have the net_ee list.
1407 * XFS seems to have problems, still, it submits pages with page_count == 0!
1408 * As a workaround, we disable sendpage on pages
1409 * with page_count == 0 or PageSlab.
1411 static int _drbd_no_send_page(struct drbd_conf *mdev, struct page *page,
1412 int offset, size_t size, unsigned msg_flags)
1414 int sent = drbd_send(mdev->tconn, mdev->tconn->data.socket, kmap(page) + offset, size, msg_flags);
1417 mdev->send_cnt += size>>9;
1418 return sent == size;
1421 static int _drbd_send_page(struct drbd_conf *mdev, struct page *page,
1422 int offset, size_t size, unsigned msg_flags)
1424 mm_segment_t oldfs = get_fs();
1428 /* e.g. XFS meta- & log-data is in slab pages, which have a
1429 * page_count of 0 and/or have PageSlab() set.
1430 * we cannot use send_page for those, as that does get_page();
1431 * put_page(); and would cause either a VM_BUG directly, or
1432 * __page_cache_release a page that would actually still be referenced
1433 * by someone, leading to some obscure delayed Oops somewhere else. */
1434 if (disable_sendpage || (page_count(page) < 1) || PageSlab(page))
1435 return _drbd_no_send_page(mdev, page, offset, size, msg_flags);
1437 msg_flags |= MSG_NOSIGNAL;
1438 drbd_update_congested(mdev->tconn);
1441 sent = mdev->tconn->data.socket->ops->sendpage(mdev->tconn->data.socket, page,
1444 if (sent == -EAGAIN) {
1445 if (we_should_drop_the_connection(mdev->tconn,
1446 mdev->tconn->data.socket))
1452 dev_warn(DEV, "%s: size=%d len=%d sent=%d\n",
1453 __func__, (int)size, len, sent);
1458 } while (len > 0 /* THINK && mdev->cstate >= C_CONNECTED*/);
1460 clear_bit(NET_CONGESTED, &mdev->tconn->flags);
1464 mdev->send_cnt += size>>9;
1468 static int _drbd_send_bio(struct drbd_conf *mdev, struct bio *bio)
1470 struct bio_vec *bvec;
1472 /* hint all but last page with MSG_MORE */
1473 __bio_for_each_segment(bvec, bio, i, 0) {
1474 if (!_drbd_no_send_page(mdev, bvec->bv_page,
1475 bvec->bv_offset, bvec->bv_len,
1476 i == bio->bi_vcnt -1 ? 0 : MSG_MORE))
1482 static int _drbd_send_zc_bio(struct drbd_conf *mdev, struct bio *bio)
1484 struct bio_vec *bvec;
1486 /* hint all but last page with MSG_MORE */
1487 __bio_for_each_segment(bvec, bio, i, 0) {
1488 if (!_drbd_send_page(mdev, bvec->bv_page,
1489 bvec->bv_offset, bvec->bv_len,
1490 i == bio->bi_vcnt -1 ? 0 : MSG_MORE))
1496 static int _drbd_send_zc_ee(struct drbd_conf *mdev,
1497 struct drbd_peer_request *peer_req)
1499 struct page *page = peer_req->pages;
1500 unsigned len = peer_req->i.size;
1502 /* hint all but last page with MSG_MORE */
1503 page_chain_for_each(page) {
1504 unsigned l = min_t(unsigned, len, PAGE_SIZE);
1505 if (!_drbd_send_page(mdev, page, 0, l,
1506 page_chain_next(page) ? MSG_MORE : 0))
1513 static u32 bio_flags_to_wire(struct drbd_conf *mdev, unsigned long bi_rw)
1515 if (mdev->tconn->agreed_pro_version >= 95)
1516 return (bi_rw & REQ_SYNC ? DP_RW_SYNC : 0) |
1517 (bi_rw & REQ_FUA ? DP_FUA : 0) |
1518 (bi_rw & REQ_FLUSH ? DP_FLUSH : 0) |
1519 (bi_rw & REQ_DISCARD ? DP_DISCARD : 0);
1521 return bi_rw & REQ_SYNC ? DP_RW_SYNC : 0;
1524 /* Used to send write requests
1525 * R_PRIMARY -> Peer (P_DATA)
1527 int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req)
1531 unsigned int dp_flags = 0;
1535 if (drbd_get_data_sock(mdev->tconn))
1538 dgs = (mdev->tconn->agreed_pro_version >= 87 && mdev->tconn->integrity_w_tfm) ?
1539 crypto_hash_digestsize(mdev->tconn->integrity_w_tfm) : 0;
1541 prepare_header(mdev, &p.head, P_DATA, sizeof(p) - sizeof(struct p_header) + dgs + req->i.size);
1542 p.sector = cpu_to_be64(req->i.sector);
1543 p.block_id = (unsigned long)req;
1544 p.seq_num = cpu_to_be32(req->seq_num = atomic_inc_return(&mdev->packet_seq));
1546 dp_flags = bio_flags_to_wire(mdev, req->master_bio->bi_rw);
1548 if (mdev->state.conn >= C_SYNC_SOURCE &&
1549 mdev->state.conn <= C_PAUSED_SYNC_T)
1550 dp_flags |= DP_MAY_SET_IN_SYNC;
1552 p.dp_flags = cpu_to_be32(dp_flags);
1553 set_bit(UNPLUG_REMOTE, &mdev->flags);
1555 drbd_send(mdev->tconn, mdev->tconn->data.socket, &p, sizeof(p), dgs ? MSG_MORE : 0));
1557 dgb = mdev->tconn->int_dig_out;
1558 drbd_csum_bio(mdev, mdev->tconn->integrity_w_tfm, req->master_bio, dgb);
1559 ok = dgs == drbd_send(mdev->tconn, mdev->tconn->data.socket, dgb, dgs, 0);
1562 /* For protocol A, we have to memcpy the payload into
1563 * socket buffers, as we may complete right away
1564 * as soon as we handed it over to tcp, at which point the data
1565 * pages may become invalid.
1567 * For data-integrity enabled, we copy it as well, so we can be
1568 * sure that even if the bio pages may still be modified, it
1569 * won't change the data on the wire, thus if the digest checks
1570 * out ok after sending on this side, but does not fit on the
1571 * receiving side, we sure have detected corruption elsewhere.
1573 if (mdev->tconn->net_conf->wire_protocol == DRBD_PROT_A || dgs)
1574 ok = _drbd_send_bio(mdev, req->master_bio);
1576 ok = _drbd_send_zc_bio(mdev, req->master_bio);
1578 /* double check digest, sometimes buffers have been modified in flight. */
1579 if (dgs > 0 && dgs <= 64) {
1580 /* 64 byte, 512 bit, is the largest digest size
1581 * currently supported in kernel crypto. */
1582 unsigned char digest[64];
1583 drbd_csum_bio(mdev, mdev->tconn->integrity_w_tfm, req->master_bio, digest);
1584 if (memcmp(mdev->tconn->int_dig_out, digest, dgs)) {
1586 "Digest mismatch, buffer modified by upper layers during write: %llus +%u\n",
1587 (unsigned long long)req->i.sector, req->i.size);
1589 } /* else if (dgs > 64) {
1590 ... Be noisy about digest too large ...
1594 drbd_put_data_sock(mdev->tconn);
1599 /* answer packet, used to send data back for read requests:
1600 * Peer -> (diskless) R_PRIMARY (P_DATA_REPLY)
1601 * C_SYNC_SOURCE -> C_SYNC_TARGET (P_RS_DATA_REPLY)
1603 int drbd_send_block(struct drbd_conf *mdev, enum drbd_packet cmd,
1604 struct drbd_peer_request *peer_req)
1611 dgs = (mdev->tconn->agreed_pro_version >= 87 && mdev->tconn->integrity_w_tfm) ?
1612 crypto_hash_digestsize(mdev->tconn->integrity_w_tfm) : 0;
1614 prepare_header(mdev, &p.head, cmd, sizeof(p) -
1615 sizeof(struct p_header80) +
1616 dgs + peer_req->i.size);
1617 p.sector = cpu_to_be64(peer_req->i.sector);
1618 p.block_id = peer_req->block_id;
1619 p.seq_num = 0; /* unused */
1621 /* Only called by our kernel thread.
1622 * This one may be interrupted by DRBD_SIG and/or DRBD_SIGKILL
1623 * in response to admin command or module unload.
1625 if (drbd_get_data_sock(mdev->tconn))
1628 ok = sizeof(p) == drbd_send(mdev->tconn, mdev->tconn->data.socket, &p, sizeof(p), dgs ? MSG_MORE : 0);
1630 dgb = mdev->tconn->int_dig_out;
1631 drbd_csum_ee(mdev, mdev->tconn->integrity_w_tfm, peer_req, dgb);
1632 ok = dgs == drbd_send(mdev->tconn, mdev->tconn->data.socket, dgb, dgs, 0);
1635 ok = _drbd_send_zc_ee(mdev, peer_req);
1637 drbd_put_data_sock(mdev->tconn);
1642 int drbd_send_oos(struct drbd_conf *mdev, struct drbd_request *req)
1644 struct p_block_desc p;
1646 p.sector = cpu_to_be64(req->i.sector);
1647 p.blksize = cpu_to_be32(req->i.size);
1649 return !drbd_send_cmd(mdev, &mdev->tconn->data, P_OUT_OF_SYNC, &p.head, sizeof(p));
1653 drbd_send distinguishes two cases:
1655 Packets sent via the data socket "sock"
1656 and packets sent via the meta data socket "msock"
1659 -----------------+-------------------------+------------------------------
1660 timeout conf.timeout / 2 conf.timeout / 2
1661 timeout action send a ping via msock Abort communication
1662 and close all sockets
1666 * you must have down()ed the appropriate [m]sock_mutex elsewhere!
1668 int drbd_send(struct drbd_tconn *tconn, struct socket *sock,
1669 void *buf, size_t size, unsigned msg_flags)
1678 /* THINK if (signal_pending) return ... ? */
1683 msg.msg_name = NULL;
1684 msg.msg_namelen = 0;
1685 msg.msg_control = NULL;
1686 msg.msg_controllen = 0;
1687 msg.msg_flags = msg_flags | MSG_NOSIGNAL;
1689 if (sock == tconn->data.socket) {
1690 tconn->ko_count = tconn->net_conf->ko_count;
1691 drbd_update_congested(tconn);
1695 * tcp_sendmsg does _not_ use its size parameter at all ?
1697 * -EAGAIN on timeout, -EINTR on signal.
1700 * do we need to block DRBD_SIG if sock == &meta.socket ??
1701 * otherwise wake_asender() might interrupt some send_*Ack !
1703 rv = kernel_sendmsg(sock, &msg, &iov, 1, size);
1704 if (rv == -EAGAIN) {
1705 if (we_should_drop_the_connection(tconn, sock))
1711 flush_signals(current);
1719 } while (sent < size);
1721 if (sock == tconn->data.socket)
1722 clear_bit(NET_CONGESTED, &tconn->flags);
1725 if (rv != -EAGAIN) {
1726 conn_err(tconn, "%s_sendmsg returned %d\n",
1727 sock == tconn->meta.socket ? "msock" : "sock",
1729 conn_request_state(tconn, NS(conn, C_BROKEN_PIPE), CS_HARD);
1731 conn_request_state(tconn, NS(conn, C_TIMEOUT), CS_HARD);
1738 * drbd_send_all - Send an entire buffer
1740 * Returns 0 upon success and a negative error value otherwise.
1742 int drbd_send_all(struct drbd_tconn *tconn, struct socket *sock, void *buffer,
1743 size_t size, unsigned msg_flags)
1747 err = drbd_send(tconn, sock, buffer, size, msg_flags);
1755 static int drbd_open(struct block_device *bdev, fmode_t mode)
1757 struct drbd_conf *mdev = bdev->bd_disk->private_data;
1758 unsigned long flags;
1761 mutex_lock(&drbd_main_mutex);
1762 spin_lock_irqsave(&mdev->tconn->req_lock, flags);
1763 /* to have a stable mdev->state.role
1764 * and no race with updating open_cnt */
1766 if (mdev->state.role != R_PRIMARY) {
1767 if (mode & FMODE_WRITE)
1769 else if (!allow_oos)
1775 spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
1776 mutex_unlock(&drbd_main_mutex);
1781 static int drbd_release(struct gendisk *gd, fmode_t mode)
1783 struct drbd_conf *mdev = gd->private_data;
1784 mutex_lock(&drbd_main_mutex);
1786 mutex_unlock(&drbd_main_mutex);
1790 static void drbd_set_defaults(struct drbd_conf *mdev)
1792 /* Beware! The actual layout differs
1793 * between big endian and little endian */
1794 mdev->state = (union drbd_state) {
1795 { .role = R_SECONDARY,
1797 .conn = C_STANDALONE,
1806 void drbd_init_set_defaults(struct drbd_conf *mdev)
1808 /* the memset(,0,) did most of this.
1809 * note: only assignments, no allocation in here */
1811 drbd_set_defaults(mdev);
1813 atomic_set(&mdev->ap_bio_cnt, 0);
1814 atomic_set(&mdev->ap_pending_cnt, 0);
1815 atomic_set(&mdev->rs_pending_cnt, 0);
1816 atomic_set(&mdev->unacked_cnt, 0);
1817 atomic_set(&mdev->local_cnt, 0);
1818 atomic_set(&mdev->pp_in_use, 0);
1819 atomic_set(&mdev->pp_in_use_by_net, 0);
1820 atomic_set(&mdev->rs_sect_in, 0);
1821 atomic_set(&mdev->rs_sect_ev, 0);
1822 atomic_set(&mdev->ap_in_flight, 0);
1824 mutex_init(&mdev->md_io_mutex);
1825 mutex_init(&mdev->own_state_mutex);
1826 mdev->state_mutex = &mdev->own_state_mutex;
1828 spin_lock_init(&mdev->al_lock);
1829 spin_lock_init(&mdev->peer_seq_lock);
1830 spin_lock_init(&mdev->epoch_lock);
1832 INIT_LIST_HEAD(&mdev->active_ee);
1833 INIT_LIST_HEAD(&mdev->sync_ee);
1834 INIT_LIST_HEAD(&mdev->done_ee);
1835 INIT_LIST_HEAD(&mdev->read_ee);
1836 INIT_LIST_HEAD(&mdev->net_ee);
1837 INIT_LIST_HEAD(&mdev->resync_reads);
1838 INIT_LIST_HEAD(&mdev->resync_work.list);
1839 INIT_LIST_HEAD(&mdev->unplug_work.list);
1840 INIT_LIST_HEAD(&mdev->go_diskless.list);
1841 INIT_LIST_HEAD(&mdev->md_sync_work.list);
1842 INIT_LIST_HEAD(&mdev->start_resync_work.list);
1843 INIT_LIST_HEAD(&mdev->bm_io_work.w.list);
1845 mdev->resync_work.cb = w_resync_timer;
1846 mdev->unplug_work.cb = w_send_write_hint;
1847 mdev->go_diskless.cb = w_go_diskless;
1848 mdev->md_sync_work.cb = w_md_sync;
1849 mdev->bm_io_work.w.cb = w_bitmap_io;
1850 mdev->start_resync_work.cb = w_start_resync;
1852 mdev->resync_work.mdev = mdev;
1853 mdev->unplug_work.mdev = mdev;
1854 mdev->go_diskless.mdev = mdev;
1855 mdev->md_sync_work.mdev = mdev;
1856 mdev->bm_io_work.w.mdev = mdev;
1857 mdev->start_resync_work.mdev = mdev;
1859 init_timer(&mdev->resync_timer);
1860 init_timer(&mdev->md_sync_timer);
1861 init_timer(&mdev->start_resync_timer);
1862 init_timer(&mdev->request_timer);
1863 mdev->resync_timer.function = resync_timer_fn;
1864 mdev->resync_timer.data = (unsigned long) mdev;
1865 mdev->md_sync_timer.function = md_sync_timer_fn;
1866 mdev->md_sync_timer.data = (unsigned long) mdev;
1867 mdev->start_resync_timer.function = start_resync_timer_fn;
1868 mdev->start_resync_timer.data = (unsigned long) mdev;
1869 mdev->request_timer.function = request_timer_fn;
1870 mdev->request_timer.data = (unsigned long) mdev;
1872 init_waitqueue_head(&mdev->misc_wait);
1873 init_waitqueue_head(&mdev->state_wait);
1874 init_waitqueue_head(&mdev->ee_wait);
1875 init_waitqueue_head(&mdev->al_wait);
1876 init_waitqueue_head(&mdev->seq_wait);
1878 /* mdev->tconn->agreed_pro_version gets initialized in drbd_connect() */
1879 mdev->write_ordering = WO_bdev_flush;
1880 mdev->resync_wenr = LC_FREE;
1881 mdev->peer_max_bio_size = DRBD_MAX_BIO_SIZE_SAFE;
1882 mdev->local_max_bio_size = DRBD_MAX_BIO_SIZE_SAFE;
1885 void drbd_mdev_cleanup(struct drbd_conf *mdev)
1888 if (mdev->tconn->receiver.t_state != NONE)
1889 dev_err(DEV, "ASSERT FAILED: receiver t_state == %d expected 0.\n",
1890 mdev->tconn->receiver.t_state);
1892 /* no need to lock it, I'm the only thread alive */
1893 if (atomic_read(&mdev->current_epoch->epoch_size) != 0)
1894 dev_err(DEV, "epoch_size:%d\n", atomic_read(&mdev->current_epoch->epoch_size));
1904 mdev->rs_failed = 0;
1905 mdev->rs_last_events = 0;
1906 mdev->rs_last_sect_ev = 0;
1907 for (i = 0; i < DRBD_SYNC_MARKS; i++) {
1908 mdev->rs_mark_left[i] = 0;
1909 mdev->rs_mark_time[i] = 0;
1911 D_ASSERT(mdev->tconn->net_conf == NULL);
1913 drbd_set_my_capacity(mdev, 0);
1915 /* maybe never allocated. */
1916 drbd_bm_resize(mdev, 0, 1);
1917 drbd_bm_cleanup(mdev);
1920 drbd_free_resources(mdev);
1921 clear_bit(AL_SUSPENDED, &mdev->flags);
1924 * currently we drbd_init_ee only on module load, so
1925 * we may do drbd_release_ee only on module unload!
1927 D_ASSERT(list_empty(&mdev->active_ee));
1928 D_ASSERT(list_empty(&mdev->sync_ee));
1929 D_ASSERT(list_empty(&mdev->done_ee));
1930 D_ASSERT(list_empty(&mdev->read_ee));
1931 D_ASSERT(list_empty(&mdev->net_ee));
1932 D_ASSERT(list_empty(&mdev->resync_reads));
1933 D_ASSERT(list_empty(&mdev->tconn->data.work.q));
1934 D_ASSERT(list_empty(&mdev->tconn->meta.work.q));
1935 D_ASSERT(list_empty(&mdev->resync_work.list));
1936 D_ASSERT(list_empty(&mdev->unplug_work.list));
1937 D_ASSERT(list_empty(&mdev->go_diskless.list));
1939 drbd_set_defaults(mdev);
1943 static void drbd_destroy_mempools(void)
1947 while (drbd_pp_pool) {
1948 page = drbd_pp_pool;
1949 drbd_pp_pool = (struct page *)page_private(page);
1954 /* D_ASSERT(atomic_read(&drbd_pp_vacant)==0); */
1956 if (drbd_md_io_bio_set)
1957 bioset_free(drbd_md_io_bio_set);
1958 if (drbd_md_io_page_pool)
1959 mempool_destroy(drbd_md_io_page_pool);
1960 if (drbd_ee_mempool)
1961 mempool_destroy(drbd_ee_mempool);
1962 if (drbd_request_mempool)
1963 mempool_destroy(drbd_request_mempool);
1965 kmem_cache_destroy(drbd_ee_cache);
1966 if (drbd_request_cache)
1967 kmem_cache_destroy(drbd_request_cache);
1968 if (drbd_bm_ext_cache)
1969 kmem_cache_destroy(drbd_bm_ext_cache);
1970 if (drbd_al_ext_cache)
1971 kmem_cache_destroy(drbd_al_ext_cache);
1973 drbd_md_io_bio_set = NULL;
1974 drbd_md_io_page_pool = NULL;
1975 drbd_ee_mempool = NULL;
1976 drbd_request_mempool = NULL;
1977 drbd_ee_cache = NULL;
1978 drbd_request_cache = NULL;
1979 drbd_bm_ext_cache = NULL;
1980 drbd_al_ext_cache = NULL;
1985 static int drbd_create_mempools(void)
1988 const int number = (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * minor_count;
1991 /* prepare our caches and mempools */
1992 drbd_request_mempool = NULL;
1993 drbd_ee_cache = NULL;
1994 drbd_request_cache = NULL;
1995 drbd_bm_ext_cache = NULL;
1996 drbd_al_ext_cache = NULL;
1997 drbd_pp_pool = NULL;
1998 drbd_md_io_page_pool = NULL;
1999 drbd_md_io_bio_set = NULL;
2002 drbd_request_cache = kmem_cache_create(
2003 "drbd_req", sizeof(struct drbd_request), 0, 0, NULL);
2004 if (drbd_request_cache == NULL)
2007 drbd_ee_cache = kmem_cache_create(
2008 "drbd_ee", sizeof(struct drbd_peer_request), 0, 0, NULL);
2009 if (drbd_ee_cache == NULL)
2012 drbd_bm_ext_cache = kmem_cache_create(
2013 "drbd_bm", sizeof(struct bm_extent), 0, 0, NULL);
2014 if (drbd_bm_ext_cache == NULL)
2017 drbd_al_ext_cache = kmem_cache_create(
2018 "drbd_al", sizeof(struct lc_element), 0, 0, NULL);
2019 if (drbd_al_ext_cache == NULL)
2023 drbd_md_io_bio_set = bioset_create(DRBD_MIN_POOL_PAGES, 0);
2024 if (drbd_md_io_bio_set == NULL)
2027 drbd_md_io_page_pool = mempool_create_page_pool(DRBD_MIN_POOL_PAGES, 0);
2028 if (drbd_md_io_page_pool == NULL)
2031 drbd_request_mempool = mempool_create(number,
2032 mempool_alloc_slab, mempool_free_slab, drbd_request_cache);
2033 if (drbd_request_mempool == NULL)
2036 drbd_ee_mempool = mempool_create(number,
2037 mempool_alloc_slab, mempool_free_slab, drbd_ee_cache);
2038 if (drbd_ee_mempool == NULL)
2041 /* drbd's page pool */
2042 spin_lock_init(&drbd_pp_lock);
2044 for (i = 0; i < number; i++) {
2045 page = alloc_page(GFP_HIGHUSER);
2048 set_page_private(page, (unsigned long)drbd_pp_pool);
2049 drbd_pp_pool = page;
2051 drbd_pp_vacant = number;
2056 drbd_destroy_mempools(); /* in case we allocated some */
2060 static int drbd_notify_sys(struct notifier_block *this, unsigned long code,
2063 /* just so we have it. you never know what interesting things we
2064 * might want to do here some day...
2070 static struct notifier_block drbd_notifier = {
2071 .notifier_call = drbd_notify_sys,
2074 static void drbd_release_ee_lists(struct drbd_conf *mdev)
2078 rr = drbd_release_ee(mdev, &mdev->active_ee);
2080 dev_err(DEV, "%d EEs in active list found!\n", rr);
2082 rr = drbd_release_ee(mdev, &mdev->sync_ee);
2084 dev_err(DEV, "%d EEs in sync list found!\n", rr);
2086 rr = drbd_release_ee(mdev, &mdev->read_ee);
2088 dev_err(DEV, "%d EEs in read list found!\n", rr);
2090 rr = drbd_release_ee(mdev, &mdev->done_ee);
2092 dev_err(DEV, "%d EEs in done list found!\n", rr);
2094 rr = drbd_release_ee(mdev, &mdev->net_ee);
2096 dev_err(DEV, "%d EEs in net list found!\n", rr);
2099 /* caution. no locking. */
2100 void drbd_delete_device(unsigned int minor)
2102 struct drbd_conf *mdev = minor_to_mdev(minor);
2107 idr_remove(&mdev->tconn->volumes, mdev->vnr);
2108 idr_remove(&minors, minor);
2111 /* paranoia asserts */
2112 D_ASSERT(mdev->open_cnt == 0);
2113 D_ASSERT(list_empty(&mdev->tconn->data.work.q));
2114 /* end paranoia asserts */
2116 del_gendisk(mdev->vdisk);
2118 /* cleanup stuff that may have been allocated during
2119 * device (re-)configuration or state changes */
2121 if (mdev->this_bdev)
2122 bdput(mdev->this_bdev);
2124 drbd_free_resources(mdev);
2126 drbd_release_ee_lists(mdev);
2128 lc_destroy(mdev->act_log);
2129 lc_destroy(mdev->resync);
2131 kfree(mdev->p_uuid);
2132 /* mdev->p_uuid = NULL; */
2134 /* cleanup the rest that has been
2135 * allocated from drbd_new_device
2136 * and actually free the mdev itself */
2137 drbd_free_mdev(mdev);
2140 static void drbd_cleanup(void)
2143 struct drbd_conf *mdev;
2145 unregister_reboot_notifier(&drbd_notifier);
2147 /* first remove proc,
2148 * drbdsetup uses it's presence to detect
2149 * whether DRBD is loaded.
2150 * If we would get stuck in proc removal,
2151 * but have netlink already deregistered,
2152 * some drbdsetup commands may wait forever
2156 remove_proc_entry("drbd", NULL);
2158 drbd_genl_unregister();
2160 idr_for_each_entry(&minors, mdev, i)
2161 drbd_delete_device(i);
2162 drbd_destroy_mempools();
2163 unregister_blkdev(DRBD_MAJOR, "drbd");
2165 idr_destroy(&minors);
2167 printk(KERN_INFO "drbd: module cleanup done.\n");
2171 * drbd_congested() - Callback for pdflush
2172 * @congested_data: User data
2173 * @bdi_bits: Bits pdflush is currently interested in
2175 * Returns 1<<BDI_async_congested and/or 1<<BDI_sync_congested if we are congested.
2177 static int drbd_congested(void *congested_data, int bdi_bits)
2179 struct drbd_conf *mdev = congested_data;
2180 struct request_queue *q;
2184 if (!may_inc_ap_bio(mdev)) {
2185 /* DRBD has frozen IO */
2191 if (get_ldev(mdev)) {
2192 q = bdev_get_queue(mdev->ldev->backing_bdev);
2193 r = bdi_congested(&q->backing_dev_info, bdi_bits);
2199 if (bdi_bits & (1 << BDI_async_congested) && test_bit(NET_CONGESTED, &mdev->tconn->flags)) {
2200 r |= (1 << BDI_async_congested);
2201 reason = reason == 'b' ? 'a' : 'n';
2205 mdev->congestion_reason = reason;
2209 static void drbd_init_workqueue(struct drbd_work_queue* wq)
2211 sema_init(&wq->s, 0);
2212 spin_lock_init(&wq->q_lock);
2213 INIT_LIST_HEAD(&wq->q);
2216 struct drbd_tconn *conn_by_name(const char *name)
2218 struct drbd_tconn *tconn;
2220 if (!name || !name[0])
2223 mutex_lock(&drbd_cfg_mutex);
2224 list_for_each_entry(tconn, &drbd_tconns, all_tconn) {
2225 if (!strcmp(tconn->name, name))
2230 mutex_unlock(&drbd_cfg_mutex);
2234 struct drbd_tconn *drbd_new_tconn(const char *name)
2236 struct drbd_tconn *tconn;
2238 tconn = kzalloc(sizeof(struct drbd_tconn), GFP_KERNEL);
2242 tconn->name = kstrdup(name, GFP_KERNEL);
2246 if (!zalloc_cpumask_var(&tconn->cpu_mask, GFP_KERNEL))
2249 if (!tl_init(tconn))
2252 tconn->cstate = C_STANDALONE;
2253 mutex_init(&tconn->cstate_mutex);
2254 spin_lock_init(&tconn->req_lock);
2255 atomic_set(&tconn->net_cnt, 0);
2256 init_waitqueue_head(&tconn->net_cnt_wait);
2257 init_waitqueue_head(&tconn->ping_wait);
2258 idr_init(&tconn->volumes);
2260 drbd_init_workqueue(&tconn->data.work);
2261 mutex_init(&tconn->data.mutex);
2263 drbd_init_workqueue(&tconn->meta.work);
2264 mutex_init(&tconn->meta.mutex);
2266 drbd_thread_init(tconn, &tconn->receiver, drbdd_init, "receiver");
2267 drbd_thread_init(tconn, &tconn->worker, drbd_worker, "worker");
2268 drbd_thread_init(tconn, &tconn->asender, drbd_asender, "asender");
2270 tconn->res_opts = (struct res_opts) {
2271 {}, 0, /* cpu_mask */
2272 DRBD_ON_NO_DATA_DEF, /* on_no_data */
2275 mutex_lock(&drbd_cfg_mutex);
2276 list_add_tail(&tconn->all_tconn, &drbd_tconns);
2277 mutex_unlock(&drbd_cfg_mutex);
2283 free_cpumask_var(tconn->cpu_mask);
2290 void drbd_free_tconn(struct drbd_tconn *tconn)
2292 list_del(&tconn->all_tconn);
2293 idr_destroy(&tconn->volumes);
2295 free_cpumask_var(tconn->cpu_mask);
2297 kfree(tconn->int_dig_out);
2298 kfree(tconn->int_dig_in);
2299 kfree(tconn->int_dig_vv);
2303 enum drbd_ret_code conn_new_minor(struct drbd_tconn *tconn, unsigned int minor, int vnr)
2305 struct drbd_conf *mdev;
2306 struct gendisk *disk;
2307 struct request_queue *q;
2309 int minor_got = minor;
2310 enum drbd_ret_code err = ERR_NOMEM;
2312 mdev = minor_to_mdev(minor);
2314 return ERR_MINOR_EXISTS;
2316 /* GFP_KERNEL, we are outside of all write-out paths */
2317 mdev = kzalloc(sizeof(struct drbd_conf), GFP_KERNEL);
2321 mdev->tconn = tconn;
2322 mdev->minor = minor;
2325 drbd_init_set_defaults(mdev);
2327 q = blk_alloc_queue(GFP_KERNEL);
2331 q->queuedata = mdev;
2333 disk = alloc_disk(1);
2338 set_disk_ro(disk, true);
2341 disk->major = DRBD_MAJOR;
2342 disk->first_minor = minor;
2343 disk->fops = &drbd_ops;
2344 sprintf(disk->disk_name, "drbd%d", minor);
2345 disk->private_data = mdev;
2347 mdev->this_bdev = bdget(MKDEV(DRBD_MAJOR, minor));
2348 /* we have no partitions. we contain only ourselves. */
2349 mdev->this_bdev->bd_contains = mdev->this_bdev;
2351 q->backing_dev_info.congested_fn = drbd_congested;
2352 q->backing_dev_info.congested_data = mdev;
2354 blk_queue_make_request(q, drbd_make_request);
2355 /* Setting the max_hw_sectors to an odd value of 8kibyte here
2356 This triggers a max_bio_size message upon first attach or connect */
2357 blk_queue_max_hw_sectors(q, DRBD_MAX_BIO_SIZE_SAFE >> 8);
2358 blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
2359 blk_queue_merge_bvec(q, drbd_merge_bvec);
2360 q->queue_lock = &mdev->tconn->req_lock; /* needed since we use */
2362 mdev->md_io_page = alloc_page(GFP_KERNEL);
2363 if (!mdev->md_io_page)
2364 goto out_no_io_page;
2366 if (drbd_bm_init(mdev))
2368 mdev->read_requests = RB_ROOT;
2369 mdev->write_requests = RB_ROOT;
2371 mdev->current_epoch = kzalloc(sizeof(struct drbd_epoch), GFP_KERNEL);
2372 if (!mdev->current_epoch)
2375 INIT_LIST_HEAD(&mdev->current_epoch->list);
2378 if (!idr_pre_get(&minors, GFP_KERNEL))
2379 goto out_no_minor_idr;
2380 if (idr_get_new_above(&minors, mdev, minor, &minor_got))
2381 goto out_no_minor_idr;
2382 if (minor_got != minor) {
2383 err = ERR_MINOR_EXISTS;
2384 drbd_msg_put_info("requested minor exists already");
2385 goto out_idr_remove_minor;
2388 if (!idr_pre_get(&tconn->volumes, GFP_KERNEL))
2389 goto out_idr_remove_minor;
2390 if (idr_get_new_above(&tconn->volumes, mdev, vnr, &vnr_got))
2391 goto out_idr_remove_minor;
2392 if (vnr_got != vnr) {
2393 err = ERR_INVALID_REQUEST;
2394 drbd_msg_put_info("requested volume exists already");
2395 goto out_idr_remove_vol;
2399 /* inherit the connection state */
2400 mdev->state.conn = tconn->cstate;
2401 if (mdev->state.conn == C_WF_REPORT_PARAMS)
2402 drbd_connected(vnr, mdev, tconn);
2407 idr_remove(&tconn->volumes, vnr_got);
2408 out_idr_remove_minor:
2409 idr_remove(&minors, minor_got);
2412 kfree(mdev->current_epoch);
2414 drbd_bm_cleanup(mdev);
2416 __free_page(mdev->md_io_page);
2420 blk_cleanup_queue(q);
2426 /* counterpart of drbd_new_device.
2427 * last part of drbd_delete_device. */
2428 void drbd_free_mdev(struct drbd_conf *mdev)
2430 kfree(mdev->current_epoch);
2431 if (mdev->bitmap) /* should no longer be there. */
2432 drbd_bm_cleanup(mdev);
2433 __free_page(mdev->md_io_page);
2434 put_disk(mdev->vdisk);
2435 blk_cleanup_queue(mdev->rq_queue);
2440 int __init drbd_init(void)
2444 BUILD_BUG_ON(sizeof(struct p_header80) != sizeof(struct p_header95));
2445 BUILD_BUG_ON(sizeof(struct p_handshake) != 80);
2447 if (minor_count < DRBD_MINOR_COUNT_MIN || minor_count > DRBD_MINOR_COUNT_MAX) {
2449 "drbd: invalid minor_count (%d)\n", minor_count);
2457 err = register_blkdev(DRBD_MAJOR, "drbd");
2460 "drbd: unable to register block device major %d\n",
2465 err = drbd_genl_register();
2467 printk(KERN_ERR "drbd: unable to register generic netlink family\n");
2472 register_reboot_notifier(&drbd_notifier);
2475 * allocate all necessary structs
2479 init_waitqueue_head(&drbd_pp_wait);
2481 drbd_proc = NULL; /* play safe for drbd_cleanup */
2484 err = drbd_create_mempools();
2488 drbd_proc = proc_create_data("drbd", S_IFREG | S_IRUGO , NULL, &drbd_proc_fops, NULL);
2490 printk(KERN_ERR "drbd: unable to register proc file\n");
2494 rwlock_init(&global_state_lock);
2495 INIT_LIST_HEAD(&drbd_tconns);
2497 printk(KERN_INFO "drbd: initialized. "
2498 "Version: " REL_VERSION " (api:%d/proto:%d-%d)\n",
2499 API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX);
2500 printk(KERN_INFO "drbd: %s\n", drbd_buildtag());
2501 printk(KERN_INFO "drbd: registered as block device major %d\n",
2504 return 0; /* Success! */
2509 /* currently always the case */
2510 printk(KERN_ERR "drbd: ran out of memory\n");
2512 printk(KERN_ERR "drbd: initialization failure\n");
2516 void drbd_free_bc(struct drbd_backing_dev *ldev)
2521 blkdev_put(ldev->backing_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
2522 blkdev_put(ldev->md_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
2527 void drbd_free_sock(struct drbd_tconn *tconn)
2529 if (tconn->data.socket) {
2530 mutex_lock(&tconn->data.mutex);
2531 kernel_sock_shutdown(tconn->data.socket, SHUT_RDWR);
2532 sock_release(tconn->data.socket);
2533 tconn->data.socket = NULL;
2534 mutex_unlock(&tconn->data.mutex);
2536 if (tconn->meta.socket) {
2537 mutex_lock(&tconn->meta.mutex);
2538 kernel_sock_shutdown(tconn->meta.socket, SHUT_RDWR);
2539 sock_release(tconn->meta.socket);
2540 tconn->meta.socket = NULL;
2541 mutex_unlock(&tconn->meta.mutex);
2546 void drbd_free_resources(struct drbd_conf *mdev)
2548 crypto_free_hash(mdev->tconn->csums_tfm);
2549 mdev->tconn->csums_tfm = NULL;
2550 crypto_free_hash(mdev->tconn->verify_tfm);
2551 mdev->tconn->verify_tfm = NULL;
2552 crypto_free_hash(mdev->tconn->cram_hmac_tfm);
2553 mdev->tconn->cram_hmac_tfm = NULL;
2554 crypto_free_hash(mdev->tconn->integrity_w_tfm);
2555 mdev->tconn->integrity_w_tfm = NULL;
2556 crypto_free_hash(mdev->tconn->integrity_r_tfm);
2557 mdev->tconn->integrity_r_tfm = NULL;
2559 drbd_free_sock(mdev->tconn);
2562 drbd_free_bc(mdev->ldev);
2563 mdev->ldev = NULL;);
2566 /* meta data management */
2568 struct meta_data_on_disk {
2569 u64 la_size; /* last agreed size. */
2570 u64 uuid[UI_SIZE]; /* UUIDs. */
2573 u32 flags; /* MDF */
2576 u32 al_offset; /* offset to this block */
2577 u32 al_nr_extents; /* important for restoring the AL */
2578 /* `-- act_log->nr_elements <-- ldev->dc.al_extents */
2579 u32 bm_offset; /* offset to the bitmap, from here */
2580 u32 bm_bytes_per_bit; /* BM_BLOCK_SIZE */
2581 u32 la_peer_max_bio_size; /* last peer max_bio_size */
2582 u32 reserved_u32[3];
2587 * drbd_md_sync() - Writes the meta data super block if the MD_DIRTY flag bit is set
2588 * @mdev: DRBD device.
2590 void drbd_md_sync(struct drbd_conf *mdev)
2592 struct meta_data_on_disk *buffer;
2596 del_timer(&mdev->md_sync_timer);
2597 /* timer may be rearmed by drbd_md_mark_dirty() now. */
2598 if (!test_and_clear_bit(MD_DIRTY, &mdev->flags))
2601 /* We use here D_FAILED and not D_ATTACHING because we try to write
2602 * metadata even if we detach due to a disk failure! */
2603 if (!get_ldev_if_state(mdev, D_FAILED))
2606 mutex_lock(&mdev->md_io_mutex);
2607 buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);
2608 memset(buffer, 0, 512);
2610 buffer->la_size = cpu_to_be64(drbd_get_capacity(mdev->this_bdev));
2611 for (i = UI_CURRENT; i < UI_SIZE; i++)
2612 buffer->uuid[i] = cpu_to_be64(mdev->ldev->md.uuid[i]);
2613 buffer->flags = cpu_to_be32(mdev->ldev->md.flags);
2614 buffer->magic = cpu_to_be32(DRBD_MD_MAGIC);
2616 buffer->md_size_sect = cpu_to_be32(mdev->ldev->md.md_size_sect);
2617 buffer->al_offset = cpu_to_be32(mdev->ldev->md.al_offset);
2618 buffer->al_nr_extents = cpu_to_be32(mdev->act_log->nr_elements);
2619 buffer->bm_bytes_per_bit = cpu_to_be32(BM_BLOCK_SIZE);
2620 buffer->device_uuid = cpu_to_be64(mdev->ldev->md.device_uuid);
2622 buffer->bm_offset = cpu_to_be32(mdev->ldev->md.bm_offset);
2623 buffer->la_peer_max_bio_size = cpu_to_be32(mdev->peer_max_bio_size);
2625 D_ASSERT(drbd_md_ss__(mdev, mdev->ldev) == mdev->ldev->md.md_offset);
2626 sector = mdev->ldev->md.md_offset;
2628 if (!drbd_md_sync_page_io(mdev, mdev->ldev, sector, WRITE)) {
2629 /* this was a try anyways ... */
2630 dev_err(DEV, "meta data update failed!\n");
2631 drbd_chk_io_error(mdev, 1, true);
2634 /* Update mdev->ldev->md.la_size_sect,
2635 * since we updated it on metadata. */
2636 mdev->ldev->md.la_size_sect = drbd_get_capacity(mdev->this_bdev);
2638 mutex_unlock(&mdev->md_io_mutex);
2643 * drbd_md_read() - Reads in the meta data super block
2644 * @mdev: DRBD device.
2645 * @bdev: Device from which the meta data should be read in.
2647 * Return 0 (NO_ERROR) on success, and an enum drbd_ret_code in case
2648 * something goes wrong. Currently only: ERR_IO_MD_DISK, ERR_MD_INVALID.
2650 int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
2652 struct meta_data_on_disk *buffer;
2653 int i, rv = NO_ERROR;
2655 if (!get_ldev_if_state(mdev, D_ATTACHING))
2656 return ERR_IO_MD_DISK;
2658 mutex_lock(&mdev->md_io_mutex);
2659 buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);
2661 if (!drbd_md_sync_page_io(mdev, bdev, bdev->md.md_offset, READ)) {
2662 /* NOTE: can't do normal error processing here as this is
2663 called BEFORE disk is attached */
2664 dev_err(DEV, "Error while reading metadata.\n");
2665 rv = ERR_IO_MD_DISK;
2669 if (buffer->magic != cpu_to_be32(DRBD_MD_MAGIC)) {
2670 dev_err(DEV, "Error while reading metadata, magic not found.\n");
2671 rv = ERR_MD_INVALID;
2674 if (be32_to_cpu(buffer->al_offset) != bdev->md.al_offset) {
2675 dev_err(DEV, "unexpected al_offset: %d (expected %d)\n",
2676 be32_to_cpu(buffer->al_offset), bdev->md.al_offset);
2677 rv = ERR_MD_INVALID;
2680 if (be32_to_cpu(buffer->bm_offset) != bdev->md.bm_offset) {
2681 dev_err(DEV, "unexpected bm_offset: %d (expected %d)\n",
2682 be32_to_cpu(buffer->bm_offset), bdev->md.bm_offset);
2683 rv = ERR_MD_INVALID;
2686 if (be32_to_cpu(buffer->md_size_sect) != bdev->md.md_size_sect) {
2687 dev_err(DEV, "unexpected md_size: %u (expected %u)\n",
2688 be32_to_cpu(buffer->md_size_sect), bdev->md.md_size_sect);
2689 rv = ERR_MD_INVALID;
2693 if (be32_to_cpu(buffer->bm_bytes_per_bit) != BM_BLOCK_SIZE) {
2694 dev_err(DEV, "unexpected bm_bytes_per_bit: %u (expected %u)\n",
2695 be32_to_cpu(buffer->bm_bytes_per_bit), BM_BLOCK_SIZE);
2696 rv = ERR_MD_INVALID;
2700 bdev->md.la_size_sect = be64_to_cpu(buffer->la_size);
2701 for (i = UI_CURRENT; i < UI_SIZE; i++)
2702 bdev->md.uuid[i] = be64_to_cpu(buffer->uuid[i]);
2703 bdev->md.flags = be32_to_cpu(buffer->flags);
2704 bdev->dc.al_extents = be32_to_cpu(buffer->al_nr_extents);
2705 bdev->md.device_uuid = be64_to_cpu(buffer->device_uuid);
2707 spin_lock_irq(&mdev->tconn->req_lock);
2708 if (mdev->state.conn < C_CONNECTED) {
2710 peer = be32_to_cpu(buffer->la_peer_max_bio_size);
2711 peer = max_t(int, peer, DRBD_MAX_BIO_SIZE_SAFE);
2712 mdev->peer_max_bio_size = peer;
2714 spin_unlock_irq(&mdev->tconn->req_lock);
2716 if (bdev->dc.al_extents < 7)
2717 bdev->dc.al_extents = 127;
2720 mutex_unlock(&mdev->md_io_mutex);
2727 * drbd_md_mark_dirty() - Mark meta data super block as dirty
2728 * @mdev: DRBD device.
2730 * Call this function if you change anything that should be written to
2731 * the meta-data super block. This function sets MD_DIRTY, and starts a
2732 * timer that ensures that within five seconds you have to call drbd_md_sync().
2735 void drbd_md_mark_dirty_(struct drbd_conf *mdev, unsigned int line, const char *func)
2737 if (!test_and_set_bit(MD_DIRTY, &mdev->flags)) {
2738 mod_timer(&mdev->md_sync_timer, jiffies + HZ);
2739 mdev->last_md_mark_dirty.line = line;
2740 mdev->last_md_mark_dirty.func = func;
2744 void drbd_md_mark_dirty(struct drbd_conf *mdev)
2746 if (!test_and_set_bit(MD_DIRTY, &mdev->flags))
2747 mod_timer(&mdev->md_sync_timer, jiffies + 5*HZ);
2751 static void drbd_uuid_move_history(struct drbd_conf *mdev) __must_hold(local)
2755 for (i = UI_HISTORY_START; i < UI_HISTORY_END; i++)
2756 mdev->ldev->md.uuid[i+1] = mdev->ldev->md.uuid[i];
2759 void _drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local)
2761 if (idx == UI_CURRENT) {
2762 if (mdev->state.role == R_PRIMARY)
2767 drbd_set_ed_uuid(mdev, val);
2770 mdev->ldev->md.uuid[idx] = val;
2771 drbd_md_mark_dirty(mdev);
2775 void drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local)
2777 if (mdev->ldev->md.uuid[idx]) {
2778 drbd_uuid_move_history(mdev);
2779 mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[idx];
2781 _drbd_uuid_set(mdev, idx, val);
2785 * drbd_uuid_new_current() - Creates a new current UUID
2786 * @mdev: DRBD device.
2788 * Creates a new current UUID, and rotates the old current UUID into
2789 * the bitmap slot. Causes an incremental resync upon next connect.
2791 void drbd_uuid_new_current(struct drbd_conf *mdev) __must_hold(local)
2794 unsigned long long bm_uuid = mdev->ldev->md.uuid[UI_BITMAP];
2797 dev_warn(DEV, "bm UUID was already set: %llX\n", bm_uuid);
2799 mdev->ldev->md.uuid[UI_BITMAP] = mdev->ldev->md.uuid[UI_CURRENT];
2801 get_random_bytes(&val, sizeof(u64));
2802 _drbd_uuid_set(mdev, UI_CURRENT, val);
2803 drbd_print_uuids(mdev, "new current UUID");
2804 /* get it to stable storage _now_ */
2808 void drbd_uuid_set_bm(struct drbd_conf *mdev, u64 val) __must_hold(local)
2810 if (mdev->ldev->md.uuid[UI_BITMAP] == 0 && val == 0)
2814 drbd_uuid_move_history(mdev);
2815 mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[UI_BITMAP];
2816 mdev->ldev->md.uuid[UI_BITMAP] = 0;
2818 unsigned long long bm_uuid = mdev->ldev->md.uuid[UI_BITMAP];
2820 dev_warn(DEV, "bm UUID was already set: %llX\n", bm_uuid);
2822 mdev->ldev->md.uuid[UI_BITMAP] = val & ~((u64)1);
2824 drbd_md_mark_dirty(mdev);
2828 * drbd_bmio_set_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
2829 * @mdev: DRBD device.
2831 * Sets all bits in the bitmap and writes the whole bitmap to stable storage.
2833 int drbd_bmio_set_n_write(struct drbd_conf *mdev)
2837 if (get_ldev_if_state(mdev, D_ATTACHING)) {
2838 drbd_md_set_flag(mdev, MDF_FULL_SYNC);
2840 drbd_bm_set_all(mdev);
2842 rv = drbd_bm_write(mdev);
2845 drbd_md_clear_flag(mdev, MDF_FULL_SYNC);
2856 * drbd_bmio_clear_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
2857 * @mdev: DRBD device.
2859 * Clears all bits in the bitmap and writes the whole bitmap to stable storage.
2861 int drbd_bmio_clear_n_write(struct drbd_conf *mdev)
2865 drbd_resume_al(mdev);
2866 if (get_ldev_if_state(mdev, D_ATTACHING)) {
2867 drbd_bm_clear_all(mdev);
2868 rv = drbd_bm_write(mdev);
2875 static int w_bitmap_io(struct drbd_work *w, int unused)
2877 struct bm_io_work *work = container_of(w, struct bm_io_work, w);
2878 struct drbd_conf *mdev = w->mdev;
2881 D_ASSERT(atomic_read(&mdev->ap_bio_cnt) == 0);
2883 if (get_ldev(mdev)) {
2884 drbd_bm_lock(mdev, work->why, work->flags);
2885 rv = work->io_fn(mdev);
2886 drbd_bm_unlock(mdev);
2890 clear_bit_unlock(BITMAP_IO, &mdev->flags);
2891 wake_up(&mdev->misc_wait);
2894 work->done(mdev, rv);
2896 clear_bit(BITMAP_IO_QUEUED, &mdev->flags);
2903 void drbd_ldev_destroy(struct drbd_conf *mdev)
2905 lc_destroy(mdev->resync);
2906 mdev->resync = NULL;
2907 lc_destroy(mdev->act_log);
2908 mdev->act_log = NULL;
2910 drbd_free_bc(mdev->ldev);
2911 mdev->ldev = NULL;);
2913 clear_bit(GO_DISKLESS, &mdev->flags);
2916 static int w_go_diskless(struct drbd_work *w, int unused)
2918 struct drbd_conf *mdev = w->mdev;
2920 D_ASSERT(mdev->state.disk == D_FAILED);
2921 /* we cannot assert local_cnt == 0 here, as get_ldev_if_state will
2922 * inc/dec it frequently. Once we are D_DISKLESS, no one will touch
2923 * the protected members anymore, though, so once put_ldev reaches zero
2924 * again, it will be safe to free them. */
2925 drbd_force_state(mdev, NS(disk, D_DISKLESS));
2929 void drbd_go_diskless(struct drbd_conf *mdev)
2931 D_ASSERT(mdev->state.disk == D_FAILED);
2932 if (!test_and_set_bit(GO_DISKLESS, &mdev->flags))
2933 drbd_queue_work(&mdev->tconn->data.work, &mdev->go_diskless);
2937 * drbd_queue_bitmap_io() - Queues an IO operation on the whole bitmap
2938 * @mdev: DRBD device.
2939 * @io_fn: IO callback to be called when bitmap IO is possible
2940 * @done: callback to be called after the bitmap IO was performed
2941 * @why: Descriptive text of the reason for doing the IO
2943 * While IO on the bitmap happens we freeze application IO thus we ensure
2944 * that drbd_set_out_of_sync() can not be called. This function MAY ONLY be
2945 * called from worker context. It MUST NOT be used while a previous such
2946 * work is still pending!
2948 void drbd_queue_bitmap_io(struct drbd_conf *mdev,
2949 int (*io_fn)(struct drbd_conf *),
2950 void (*done)(struct drbd_conf *, int),
2951 char *why, enum bm_flag flags)
2953 D_ASSERT(current == mdev->tconn->worker.task);
2955 D_ASSERT(!test_bit(BITMAP_IO_QUEUED, &mdev->flags));
2956 D_ASSERT(!test_bit(BITMAP_IO, &mdev->flags));
2957 D_ASSERT(list_empty(&mdev->bm_io_work.w.list));
2958 if (mdev->bm_io_work.why)
2959 dev_err(DEV, "FIXME going to queue '%s' but '%s' still pending?\n",
2960 why, mdev->bm_io_work.why);
2962 mdev->bm_io_work.io_fn = io_fn;
2963 mdev->bm_io_work.done = done;
2964 mdev->bm_io_work.why = why;
2965 mdev->bm_io_work.flags = flags;
2967 spin_lock_irq(&mdev->tconn->req_lock);
2968 set_bit(BITMAP_IO, &mdev->flags);
2969 if (atomic_read(&mdev->ap_bio_cnt) == 0) {
2970 if (!test_and_set_bit(BITMAP_IO_QUEUED, &mdev->flags))
2971 drbd_queue_work(&mdev->tconn->data.work, &mdev->bm_io_work.w);
2973 spin_unlock_irq(&mdev->tconn->req_lock);
2977 * drbd_bitmap_io() - Does an IO operation on the whole bitmap
2978 * @mdev: DRBD device.
2979 * @io_fn: IO callback to be called when bitmap IO is possible
2980 * @why: Descriptive text of the reason for doing the IO
2982 * freezes application IO while that the actual IO operations runs. This
2983 * functions MAY NOT be called from worker context.
2985 int drbd_bitmap_io(struct drbd_conf *mdev, int (*io_fn)(struct drbd_conf *),
2986 char *why, enum bm_flag flags)
2990 D_ASSERT(current != mdev->tconn->worker.task);
2992 if ((flags & BM_LOCKED_SET_ALLOWED) == 0)
2993 drbd_suspend_io(mdev);
2995 drbd_bm_lock(mdev, why, flags);
2997 drbd_bm_unlock(mdev);
2999 if ((flags & BM_LOCKED_SET_ALLOWED) == 0)
3000 drbd_resume_io(mdev);
3005 void drbd_md_set_flag(struct drbd_conf *mdev, int flag) __must_hold(local)
3007 if ((mdev->ldev->md.flags & flag) != flag) {
3008 drbd_md_mark_dirty(mdev);
3009 mdev->ldev->md.flags |= flag;
3013 void drbd_md_clear_flag(struct drbd_conf *mdev, int flag) __must_hold(local)
3015 if ((mdev->ldev->md.flags & flag) != 0) {
3016 drbd_md_mark_dirty(mdev);
3017 mdev->ldev->md.flags &= ~flag;
3020 int drbd_md_test_flag(struct drbd_backing_dev *bdev, int flag)
3022 return (bdev->md.flags & flag) != 0;
3025 static void md_sync_timer_fn(unsigned long data)
3027 struct drbd_conf *mdev = (struct drbd_conf *) data;
3029 drbd_queue_work_front(&mdev->tconn->data.work, &mdev->md_sync_work);
3032 static int w_md_sync(struct drbd_work *w, int unused)
3034 struct drbd_conf *mdev = w->mdev;
3036 dev_warn(DEV, "md_sync_timer expired! Worker calls drbd_md_sync().\n");
3038 dev_warn(DEV, "last md_mark_dirty: %s:%u\n",
3039 mdev->last_md_mark_dirty.func, mdev->last_md_mark_dirty.line);
3045 const char *cmdname(enum drbd_packet cmd)
3047 /* THINK may need to become several global tables
3048 * when we want to support more than
3049 * one PRO_VERSION */
3050 static const char *cmdnames[] = {
3052 [P_DATA_REPLY] = "DataReply",
3053 [P_RS_DATA_REPLY] = "RSDataReply",
3054 [P_BARRIER] = "Barrier",
3055 [P_BITMAP] = "ReportBitMap",
3056 [P_BECOME_SYNC_TARGET] = "BecomeSyncTarget",
3057 [P_BECOME_SYNC_SOURCE] = "BecomeSyncSource",
3058 [P_UNPLUG_REMOTE] = "UnplugRemote",
3059 [P_DATA_REQUEST] = "DataRequest",
3060 [P_RS_DATA_REQUEST] = "RSDataRequest",
3061 [P_SYNC_PARAM] = "SyncParam",
3062 [P_SYNC_PARAM89] = "SyncParam89",
3063 [P_PROTOCOL] = "ReportProtocol",
3064 [P_UUIDS] = "ReportUUIDs",
3065 [P_SIZES] = "ReportSizes",
3066 [P_STATE] = "ReportState",
3067 [P_SYNC_UUID] = "ReportSyncUUID",
3068 [P_AUTH_CHALLENGE] = "AuthChallenge",
3069 [P_AUTH_RESPONSE] = "AuthResponse",
3071 [P_PING_ACK] = "PingAck",
3072 [P_RECV_ACK] = "RecvAck",
3073 [P_WRITE_ACK] = "WriteAck",
3074 [P_RS_WRITE_ACK] = "RSWriteAck",
3075 [P_DISCARD_WRITE] = "DiscardWrite",
3076 [P_NEG_ACK] = "NegAck",
3077 [P_NEG_DREPLY] = "NegDReply",
3078 [P_NEG_RS_DREPLY] = "NegRSDReply",
3079 [P_BARRIER_ACK] = "BarrierAck",
3080 [P_STATE_CHG_REQ] = "StateChgRequest",
3081 [P_STATE_CHG_REPLY] = "StateChgReply",
3082 [P_OV_REQUEST] = "OVRequest",
3083 [P_OV_REPLY] = "OVReply",
3084 [P_OV_RESULT] = "OVResult",
3085 [P_CSUM_RS_REQUEST] = "CsumRSRequest",
3086 [P_RS_IS_IN_SYNC] = "CsumRSIsInSync",
3087 [P_COMPRESSED_BITMAP] = "CBitmap",
3088 [P_DELAY_PROBE] = "DelayProbe",
3089 [P_OUT_OF_SYNC] = "OutOfSync",
3090 [P_RETRY_WRITE] = "RetryWrite",
3093 if (cmd == P_HAND_SHAKE_M)
3094 return "HandShakeM";
3095 if (cmd == P_HAND_SHAKE_S)
3096 return "HandShakeS";
3097 if (cmd == P_HAND_SHAKE)
3099 if (cmd >= ARRAY_SIZE(cmdnames))
3101 return cmdnames[cmd];
3105 * drbd_wait_misc - wait for a request to make progress
3106 * @mdev: device associated with the request
3107 * @i: the struct drbd_interval embedded in struct drbd_request or
3108 * struct drbd_peer_request
3110 int drbd_wait_misc(struct drbd_conf *mdev, struct drbd_interval *i)
3112 struct net_conf *net_conf = mdev->tconn->net_conf;
3118 timeout = MAX_SCHEDULE_TIMEOUT;
3119 if (net_conf->ko_count)
3120 timeout = net_conf->timeout * HZ / 10 * net_conf->ko_count;
3122 /* Indicate to wake up mdev->misc_wait on progress. */
3124 prepare_to_wait(&mdev->misc_wait, &wait, TASK_INTERRUPTIBLE);
3125 spin_unlock_irq(&mdev->tconn->req_lock);
3126 timeout = schedule_timeout(timeout);
3127 finish_wait(&mdev->misc_wait, &wait);
3128 spin_lock_irq(&mdev->tconn->req_lock);
3129 if (!timeout || mdev->state.conn < C_CONNECTED)
3131 if (signal_pending(current))
3132 return -ERESTARTSYS;
3136 #ifdef CONFIG_DRBD_FAULT_INJECTION
3137 /* Fault insertion support including random number generator shamelessly
3138 * stolen from kernel/rcutorture.c */
3139 struct fault_random_state {
3140 unsigned long state;
3141 unsigned long count;
3144 #define FAULT_RANDOM_MULT 39916801 /* prime */
3145 #define FAULT_RANDOM_ADD 479001701 /* prime */
3146 #define FAULT_RANDOM_REFRESH 10000
3149 * Crude but fast random-number generator. Uses a linear congruential
3150 * generator, with occasional help from get_random_bytes().
3152 static unsigned long
3153 _drbd_fault_random(struct fault_random_state *rsp)
3157 if (!rsp->count--) {
3158 get_random_bytes(&refresh, sizeof(refresh));
3159 rsp->state += refresh;
3160 rsp->count = FAULT_RANDOM_REFRESH;
3162 rsp->state = rsp->state * FAULT_RANDOM_MULT + FAULT_RANDOM_ADD;
3163 return swahw32(rsp->state);
3167 _drbd_fault_str(unsigned int type) {
3168 static char *_faults[] = {
3169 [DRBD_FAULT_MD_WR] = "Meta-data write",
3170 [DRBD_FAULT_MD_RD] = "Meta-data read",
3171 [DRBD_FAULT_RS_WR] = "Resync write",
3172 [DRBD_FAULT_RS_RD] = "Resync read",
3173 [DRBD_FAULT_DT_WR] = "Data write",
3174 [DRBD_FAULT_DT_RD] = "Data read",
3175 [DRBD_FAULT_DT_RA] = "Data read ahead",
3176 [DRBD_FAULT_BM_ALLOC] = "BM allocation",
3177 [DRBD_FAULT_AL_EE] = "EE allocation",
3178 [DRBD_FAULT_RECEIVE] = "receive data corruption",
3181 return (type < DRBD_FAULT_MAX) ? _faults[type] : "**Unknown**";
3185 _drbd_insert_fault(struct drbd_conf *mdev, unsigned int type)
3187 static struct fault_random_state rrs = {0, 0};
3189 unsigned int ret = (
3191 ((1 << mdev_to_minor(mdev)) & fault_devs) != 0) &&
3192 (((_drbd_fault_random(&rrs) % 100) + 1) <= fault_rate));
3197 if (__ratelimit(&drbd_ratelimit_state))
3198 dev_warn(DEV, "***Simulating %s failure\n",
3199 _drbd_fault_str(type));
3206 const char *drbd_buildtag(void)
3208 /* DRBD built from external sources has here a reference to the
3209 git hash of the source code. */
3211 static char buildtag[38] = "\0uilt-in";
3213 if (buildtag[0] == 0) {
3214 #ifdef CONFIG_MODULES
3215 if (THIS_MODULE != NULL)
3216 sprintf(buildtag, "srcversion: %-24s", THIS_MODULE->srcversion);
3225 module_init(drbd_init)
3226 module_exit(drbd_cleanup)
3228 EXPORT_SYMBOL(drbd_conn_str);
3229 EXPORT_SYMBOL(drbd_role_str);
3230 EXPORT_SYMBOL(drbd_disk_str);
3231 EXPORT_SYMBOL(drbd_set_st_err_str);