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 DECLARE_RWSEM(drbd_cfg_rwsem);
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 */
457 idr_for_each_entry(&tconn->volumes, mdev, vnr)
458 clear_bit(CREATE_BARRIER, &mdev->flags);
461 spin_unlock_irq(&tconn->req_lock);
464 void tl_restart(struct drbd_tconn *tconn, enum drbd_req_event what)
466 spin_lock_irq(&tconn->req_lock);
467 _tl_restart(tconn, what);
468 spin_unlock_irq(&tconn->req_lock);
471 static int drbd_thread_setup(void *arg)
473 struct drbd_thread *thi = (struct drbd_thread *) arg;
474 struct drbd_tconn *tconn = thi->tconn;
478 snprintf(current->comm, sizeof(current->comm), "drbd_%c_%s",
479 thi->name[0], thi->tconn->name);
482 retval = thi->function(thi);
484 spin_lock_irqsave(&thi->t_lock, flags);
486 /* if the receiver has been "EXITING", the last thing it did
487 * was set the conn state to "StandAlone",
488 * if now a re-connect request comes in, conn state goes C_UNCONNECTED,
489 * and receiver thread will be "started".
490 * drbd_thread_start needs to set "RESTARTING" in that case.
491 * t_state check and assignment needs to be within the same spinlock,
492 * so either thread_start sees EXITING, and can remap to RESTARTING,
493 * or thread_start see NONE, and can proceed as normal.
496 if (thi->t_state == RESTARTING) {
497 conn_info(tconn, "Restarting %s thread\n", thi->name);
498 thi->t_state = RUNNING;
499 spin_unlock_irqrestore(&thi->t_lock, flags);
506 complete_all(&thi->stop);
507 spin_unlock_irqrestore(&thi->t_lock, flags);
509 conn_info(tconn, "Terminating %s\n", current->comm);
511 /* Release mod reference taken when thread was started */
513 kref_put(&tconn->kref, &conn_destroy);
514 module_put(THIS_MODULE);
518 static void drbd_thread_init(struct drbd_tconn *tconn, struct drbd_thread *thi,
519 int (*func) (struct drbd_thread *), char *name)
521 spin_lock_init(&thi->t_lock);
524 thi->function = func;
526 strncpy(thi->name, name, ARRAY_SIZE(thi->name));
529 int drbd_thread_start(struct drbd_thread *thi)
531 struct drbd_tconn *tconn = thi->tconn;
532 struct task_struct *nt;
535 /* is used from state engine doing drbd_thread_stop_nowait,
536 * while holding the req lock irqsave */
537 spin_lock_irqsave(&thi->t_lock, flags);
539 switch (thi->t_state) {
541 conn_info(tconn, "Starting %s thread (from %s [%d])\n",
542 thi->name, current->comm, current->pid);
544 /* Get ref on module for thread - this is released when thread exits */
545 if (!try_module_get(THIS_MODULE)) {
546 conn_err(tconn, "Failed to get module reference in drbd_thread_start\n");
547 spin_unlock_irqrestore(&thi->t_lock, flags);
551 kref_get(&thi->tconn->kref);
553 init_completion(&thi->stop);
554 thi->reset_cpu_mask = 1;
555 thi->t_state = RUNNING;
556 spin_unlock_irqrestore(&thi->t_lock, flags);
557 flush_signals(current); /* otherw. may get -ERESTARTNOINTR */
559 nt = kthread_create(drbd_thread_setup, (void *) thi,
560 "drbd_%c_%s", thi->name[0], thi->tconn->name);
563 conn_err(tconn, "Couldn't start thread\n");
565 kref_put(&tconn->kref, &conn_destroy);
566 module_put(THIS_MODULE);
569 spin_lock_irqsave(&thi->t_lock, flags);
571 thi->t_state = RUNNING;
572 spin_unlock_irqrestore(&thi->t_lock, flags);
576 thi->t_state = RESTARTING;
577 conn_info(tconn, "Restarting %s thread (from %s [%d])\n",
578 thi->name, current->comm, current->pid);
583 spin_unlock_irqrestore(&thi->t_lock, flags);
591 void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait)
595 enum drbd_thread_state ns = restart ? RESTARTING : EXITING;
597 /* may be called from state engine, holding the req lock irqsave */
598 spin_lock_irqsave(&thi->t_lock, flags);
600 if (thi->t_state == NONE) {
601 spin_unlock_irqrestore(&thi->t_lock, flags);
603 drbd_thread_start(thi);
607 if (thi->t_state != ns) {
608 if (thi->task == NULL) {
609 spin_unlock_irqrestore(&thi->t_lock, flags);
615 init_completion(&thi->stop);
616 if (thi->task != current)
617 force_sig(DRBD_SIGKILL, thi->task);
620 spin_unlock_irqrestore(&thi->t_lock, flags);
623 wait_for_completion(&thi->stop);
626 static struct drbd_thread *drbd_task_to_thread(struct drbd_tconn *tconn, struct task_struct *task)
628 struct drbd_thread *thi =
629 task == tconn->receiver.task ? &tconn->receiver :
630 task == tconn->asender.task ? &tconn->asender :
631 task == tconn->worker.task ? &tconn->worker : NULL;
636 char *drbd_task_to_thread_name(struct drbd_tconn *tconn, struct task_struct *task)
638 struct drbd_thread *thi = drbd_task_to_thread(tconn, task);
639 return thi ? thi->name : task->comm;
642 int conn_lowest_minor(struct drbd_tconn *tconn)
644 struct drbd_conf *mdev;
648 mdev = idr_get_next(&tconn->volumes, &vnr);
649 m = mdev ? mdev_to_minor(mdev) : -1;
657 * drbd_calc_cpu_mask() - Generate CPU masks, spread over all CPUs
658 * @mdev: DRBD device.
660 * Forces all threads of a device onto the same CPU. This is beneficial for
661 * DRBD's performance. May be overwritten by user's configuration.
663 void drbd_calc_cpu_mask(struct drbd_tconn *tconn)
668 if (cpumask_weight(tconn->cpu_mask))
671 ord = conn_lowest_minor(tconn) % cpumask_weight(cpu_online_mask);
672 for_each_online_cpu(cpu) {
674 cpumask_set_cpu(cpu, tconn->cpu_mask);
678 /* should not be reached */
679 cpumask_setall(tconn->cpu_mask);
683 * drbd_thread_current_set_cpu() - modifies the cpu mask of the _current_ thread
684 * @mdev: DRBD device.
685 * @thi: drbd_thread object
687 * call in the "main loop" of _all_ threads, no need for any mutex, current won't die
690 void drbd_thread_current_set_cpu(struct drbd_thread *thi)
692 struct task_struct *p = current;
694 if (!thi->reset_cpu_mask)
696 thi->reset_cpu_mask = 0;
697 set_cpus_allowed_ptr(p, thi->tconn->cpu_mask);
702 * drbd_header_size - size of a packet header
704 * The header size is a multiple of 8, so any payload following the header is
705 * word aligned on 64-bit architectures. (The bitmap send and receive code
708 unsigned int drbd_header_size(struct drbd_tconn *tconn)
710 if (tconn->agreed_pro_version >= 100) {
711 BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header100), 8));
712 return sizeof(struct p_header100);
714 BUILD_BUG_ON(sizeof(struct p_header80) !=
715 sizeof(struct p_header95));
716 BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header80), 8));
717 return sizeof(struct p_header80);
721 static unsigned int prepare_header80(struct p_header80 *h, enum drbd_packet cmd, int size)
723 h->magic = cpu_to_be32(DRBD_MAGIC);
724 h->command = cpu_to_be16(cmd);
725 h->length = cpu_to_be16(size);
726 return sizeof(struct p_header80);
729 static unsigned int prepare_header95(struct p_header95 *h, enum drbd_packet cmd, int size)
731 h->magic = cpu_to_be16(DRBD_MAGIC_BIG);
732 h->command = cpu_to_be16(cmd);
733 h->length = cpu_to_be32(size);
734 return sizeof(struct p_header95);
737 static unsigned int prepare_header100(struct p_header100 *h, enum drbd_packet cmd,
740 h->magic = cpu_to_be32(DRBD_MAGIC_100);
741 h->volume = cpu_to_be16(vnr);
742 h->command = cpu_to_be16(cmd);
743 h->length = cpu_to_be32(size);
745 return sizeof(struct p_header100);
748 static unsigned int prepare_header(struct drbd_tconn *tconn, int vnr,
749 void *buffer, enum drbd_packet cmd, int size)
751 if (tconn->agreed_pro_version >= 100)
752 return prepare_header100(buffer, cmd, size, vnr);
753 else if (tconn->agreed_pro_version >= 95 &&
754 size > DRBD_MAX_SIZE_H80_PACKET)
755 return prepare_header95(buffer, cmd, size);
757 return prepare_header80(buffer, cmd, size);
760 static void *__conn_prepare_command(struct drbd_tconn *tconn,
761 struct drbd_socket *sock)
765 return sock->sbuf + drbd_header_size(tconn);
768 void *conn_prepare_command(struct drbd_tconn *tconn, struct drbd_socket *sock)
772 mutex_lock(&sock->mutex);
773 p = __conn_prepare_command(tconn, sock);
775 mutex_unlock(&sock->mutex);
780 void *drbd_prepare_command(struct drbd_conf *mdev, struct drbd_socket *sock)
782 return conn_prepare_command(mdev->tconn, sock);
785 static int __send_command(struct drbd_tconn *tconn, int vnr,
786 struct drbd_socket *sock, enum drbd_packet cmd,
787 unsigned int header_size, void *data,
794 * Called with @data == NULL and the size of the data blocks in @size
795 * for commands that send data blocks. For those commands, omit the
796 * MSG_MORE flag: this will increase the likelihood that data blocks
797 * which are page aligned on the sender will end up page aligned on the
800 msg_flags = data ? MSG_MORE : 0;
802 header_size += prepare_header(tconn, vnr, sock->sbuf, cmd,
804 err = drbd_send_all(tconn, sock->socket, sock->sbuf, header_size,
807 err = drbd_send_all(tconn, sock->socket, data, size, 0);
811 static int __conn_send_command(struct drbd_tconn *tconn, struct drbd_socket *sock,
812 enum drbd_packet cmd, unsigned int header_size,
813 void *data, unsigned int size)
815 return __send_command(tconn, 0, sock, cmd, header_size, data, size);
818 int conn_send_command(struct drbd_tconn *tconn, struct drbd_socket *sock,
819 enum drbd_packet cmd, unsigned int header_size,
820 void *data, unsigned int size)
824 err = __conn_send_command(tconn, sock, cmd, header_size, data, size);
825 mutex_unlock(&sock->mutex);
829 int drbd_send_command(struct drbd_conf *mdev, struct drbd_socket *sock,
830 enum drbd_packet cmd, unsigned int header_size,
831 void *data, unsigned int size)
835 err = __send_command(mdev->tconn, mdev->vnr, sock, cmd, header_size,
837 mutex_unlock(&sock->mutex);
841 int drbd_send_ping(struct drbd_tconn *tconn)
843 struct drbd_socket *sock;
846 if (!conn_prepare_command(tconn, sock))
848 return conn_send_command(tconn, sock, P_PING, 0, NULL, 0);
851 int drbd_send_ping_ack(struct drbd_tconn *tconn)
853 struct drbd_socket *sock;
856 if (!conn_prepare_command(tconn, sock))
858 return conn_send_command(tconn, sock, P_PING_ACK, 0, NULL, 0);
861 int drbd_send_sync_param(struct drbd_conf *mdev)
863 struct drbd_socket *sock;
864 struct p_rs_param_95 *p;
866 const int apv = mdev->tconn->agreed_pro_version;
867 enum drbd_packet cmd;
869 struct disk_conf *dc;
871 sock = &mdev->tconn->data;
872 p = drbd_prepare_command(mdev, sock);
877 nc = rcu_dereference(mdev->tconn->net_conf);
879 size = apv <= 87 ? sizeof(struct p_rs_param)
880 : apv == 88 ? sizeof(struct p_rs_param)
881 + strlen(nc->verify_alg) + 1
882 : apv <= 94 ? sizeof(struct p_rs_param_89)
883 : /* apv >= 95 */ sizeof(struct p_rs_param_95);
885 cmd = apv >= 89 ? P_SYNC_PARAM89 : P_SYNC_PARAM;
887 /* initialize verify_alg and csums_alg */
888 memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX);
890 if (get_ldev(mdev)) {
891 dc = rcu_dereference(mdev->ldev->disk_conf);
892 p->rate = cpu_to_be32(dc->resync_rate);
893 p->c_plan_ahead = cpu_to_be32(dc->c_plan_ahead);
894 p->c_delay_target = cpu_to_be32(dc->c_delay_target);
895 p->c_fill_target = cpu_to_be32(dc->c_fill_target);
896 p->c_max_rate = cpu_to_be32(dc->c_max_rate);
899 p->rate = cpu_to_be32(DRBD_RATE_DEF);
900 p->c_plan_ahead = cpu_to_be32(DRBD_C_PLAN_AHEAD_DEF);
901 p->c_delay_target = cpu_to_be32(DRBD_C_DELAY_TARGET_DEF);
902 p->c_fill_target = cpu_to_be32(DRBD_C_FILL_TARGET_DEF);
903 p->c_max_rate = cpu_to_be32(DRBD_C_MAX_RATE_DEF);
907 strcpy(p->verify_alg, nc->verify_alg);
909 strcpy(p->csums_alg, nc->csums_alg);
912 return drbd_send_command(mdev, sock, cmd, size, NULL, 0);
915 int __drbd_send_protocol(struct drbd_tconn *tconn)
917 struct drbd_socket *sock;
918 struct p_protocol *p;
923 p = __conn_prepare_command(tconn, sock);
928 nc = rcu_dereference(tconn->net_conf);
930 if (nc->dry_run && tconn->agreed_pro_version < 92) {
932 mutex_unlock(&sock->mutex);
933 conn_err(tconn, "--dry-run is not supported by peer");
938 if (tconn->agreed_pro_version >= 87)
939 size += strlen(nc->integrity_alg) + 1;
941 p->protocol = cpu_to_be32(nc->wire_protocol);
942 p->after_sb_0p = cpu_to_be32(nc->after_sb_0p);
943 p->after_sb_1p = cpu_to_be32(nc->after_sb_1p);
944 p->after_sb_2p = cpu_to_be32(nc->after_sb_2p);
945 p->two_primaries = cpu_to_be32(nc->two_primaries);
951 p->conn_flags = cpu_to_be32(cf);
953 if (tconn->agreed_pro_version >= 87)
954 strcpy(p->integrity_alg, nc->integrity_alg);
957 return __conn_send_command(tconn, sock, P_PROTOCOL, size, NULL, 0);
960 int drbd_send_protocol(struct drbd_tconn *tconn)
964 mutex_lock(&tconn->data.mutex);
965 err = __drbd_send_protocol(tconn);
966 mutex_unlock(&tconn->data.mutex);
971 int _drbd_send_uuids(struct drbd_conf *mdev, u64 uuid_flags)
973 struct drbd_socket *sock;
977 if (!get_ldev_if_state(mdev, D_NEGOTIATING))
980 sock = &mdev->tconn->data;
981 p = drbd_prepare_command(mdev, sock);
986 for (i = UI_CURRENT; i < UI_SIZE; i++)
987 p->uuid[i] = mdev->ldev ? cpu_to_be64(mdev->ldev->md.uuid[i]) : 0;
989 mdev->comm_bm_set = drbd_bm_total_weight(mdev);
990 p->uuid[UI_SIZE] = cpu_to_be64(mdev->comm_bm_set);
992 uuid_flags |= rcu_dereference(mdev->tconn->net_conf)->want_lose ? 1 : 0;
994 uuid_flags |= test_bit(CRASHED_PRIMARY, &mdev->flags) ? 2 : 0;
995 uuid_flags |= mdev->new_state_tmp.disk == D_INCONSISTENT ? 4 : 0;
996 p->uuid[UI_FLAGS] = cpu_to_be64(uuid_flags);
999 return drbd_send_command(mdev, sock, P_UUIDS, sizeof(*p), NULL, 0);
1002 int drbd_send_uuids(struct drbd_conf *mdev)
1004 return _drbd_send_uuids(mdev, 0);
1007 int drbd_send_uuids_skip_initial_sync(struct drbd_conf *mdev)
1009 return _drbd_send_uuids(mdev, 8);
1012 void drbd_print_uuids(struct drbd_conf *mdev, const char *text)
1014 if (get_ldev_if_state(mdev, D_NEGOTIATING)) {
1015 u64 *uuid = mdev->ldev->md.uuid;
1016 dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX\n",
1018 (unsigned long long)uuid[UI_CURRENT],
1019 (unsigned long long)uuid[UI_BITMAP],
1020 (unsigned long long)uuid[UI_HISTORY_START],
1021 (unsigned long long)uuid[UI_HISTORY_END]);
1024 dev_info(DEV, "%s effective data uuid: %016llX\n",
1026 (unsigned long long)mdev->ed_uuid);
1030 void drbd_gen_and_send_sync_uuid(struct drbd_conf *mdev)
1032 struct drbd_socket *sock;
1033 struct p_rs_uuid *p;
1036 D_ASSERT(mdev->state.disk == D_UP_TO_DATE);
1038 uuid = mdev->ldev->md.uuid[UI_BITMAP] + UUID_NEW_BM_OFFSET;
1039 drbd_uuid_set(mdev, UI_BITMAP, uuid);
1040 drbd_print_uuids(mdev, "updated sync UUID");
1043 sock = &mdev->tconn->data;
1044 p = drbd_prepare_command(mdev, sock);
1046 p->uuid = cpu_to_be64(uuid);
1047 drbd_send_command(mdev, sock, P_SYNC_UUID, sizeof(*p), NULL, 0);
1051 int drbd_send_sizes(struct drbd_conf *mdev, int trigger_reply, enum dds_flags flags)
1053 struct drbd_socket *sock;
1055 sector_t d_size, u_size;
1056 int q_order_type, max_bio_size;
1058 if (get_ldev_if_state(mdev, D_NEGOTIATING)) {
1059 D_ASSERT(mdev->ldev->backing_bdev);
1060 d_size = drbd_get_max_capacity(mdev->ldev);
1062 u_size = rcu_dereference(mdev->ldev->disk_conf)->disk_size;
1064 q_order_type = drbd_queue_order_type(mdev);
1065 max_bio_size = queue_max_hw_sectors(mdev->ldev->backing_bdev->bd_disk->queue) << 9;
1066 max_bio_size = min_t(int, max_bio_size, DRBD_MAX_BIO_SIZE);
1071 q_order_type = QUEUE_ORDERED_NONE;
1072 max_bio_size = DRBD_MAX_BIO_SIZE; /* ... multiple BIOs per peer_request */
1075 sock = &mdev->tconn->data;
1076 p = drbd_prepare_command(mdev, sock);
1079 p->d_size = cpu_to_be64(d_size);
1080 p->u_size = cpu_to_be64(u_size);
1081 p->c_size = cpu_to_be64(trigger_reply ? 0 : drbd_get_capacity(mdev->this_bdev));
1082 p->max_bio_size = cpu_to_be32(max_bio_size);
1083 p->queue_order_type = cpu_to_be16(q_order_type);
1084 p->dds_flags = cpu_to_be16(flags);
1085 return drbd_send_command(mdev, sock, P_SIZES, sizeof(*p), NULL, 0);
1089 * drbd_send_state() - Sends the drbd state to the peer
1090 * @mdev: DRBD device.
1092 int drbd_send_state(struct drbd_conf *mdev)
1094 struct drbd_socket *sock;
1097 sock = &mdev->tconn->data;
1098 p = drbd_prepare_command(mdev, sock);
1101 p->state = cpu_to_be32(mdev->state.i); /* Within the send mutex */
1102 return drbd_send_command(mdev, sock, P_STATE, sizeof(*p), NULL, 0);
1105 int drbd_send_state_req(struct drbd_conf *mdev, union drbd_state mask, union drbd_state val)
1107 struct drbd_socket *sock;
1108 struct p_req_state *p;
1110 sock = &mdev->tconn->data;
1111 p = drbd_prepare_command(mdev, sock);
1114 p->mask = cpu_to_be32(mask.i);
1115 p->val = cpu_to_be32(val.i);
1116 return drbd_send_command(mdev, sock, P_STATE_CHG_REQ, sizeof(*p), NULL, 0);
1120 int conn_send_state_req(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val)
1122 enum drbd_packet cmd;
1123 struct drbd_socket *sock;
1124 struct p_req_state *p;
1126 cmd = tconn->agreed_pro_version < 100 ? P_STATE_CHG_REQ : P_CONN_ST_CHG_REQ;
1127 sock = &tconn->data;
1128 p = conn_prepare_command(tconn, sock);
1131 p->mask = cpu_to_be32(mask.i);
1132 p->val = cpu_to_be32(val.i);
1133 return conn_send_command(tconn, sock, cmd, sizeof(*p), NULL, 0);
1136 void drbd_send_sr_reply(struct drbd_conf *mdev, enum drbd_state_rv retcode)
1138 struct drbd_socket *sock;
1139 struct p_req_state_reply *p;
1141 sock = &mdev->tconn->meta;
1142 p = drbd_prepare_command(mdev, sock);
1144 p->retcode = cpu_to_be32(retcode);
1145 drbd_send_command(mdev, sock, P_STATE_CHG_REPLY, sizeof(*p), NULL, 0);
1149 void conn_send_sr_reply(struct drbd_tconn *tconn, enum drbd_state_rv retcode)
1151 struct drbd_socket *sock;
1152 struct p_req_state_reply *p;
1153 enum drbd_packet cmd = tconn->agreed_pro_version < 100 ? P_STATE_CHG_REPLY : P_CONN_ST_CHG_REPLY;
1155 sock = &tconn->meta;
1156 p = conn_prepare_command(tconn, sock);
1158 p->retcode = cpu_to_be32(retcode);
1159 conn_send_command(tconn, sock, cmd, sizeof(*p), NULL, 0);
1163 static void dcbp_set_code(struct p_compressed_bm *p, enum drbd_bitmap_code code)
1165 BUG_ON(code & ~0xf);
1166 p->encoding = (p->encoding & ~0xf) | code;
1169 static void dcbp_set_start(struct p_compressed_bm *p, int set)
1171 p->encoding = (p->encoding & ~0x80) | (set ? 0x80 : 0);
1174 static void dcbp_set_pad_bits(struct p_compressed_bm *p, int n)
1177 p->encoding = (p->encoding & (~0x7 << 4)) | (n << 4);
1180 int fill_bitmap_rle_bits(struct drbd_conf *mdev,
1181 struct p_compressed_bm *p,
1183 struct bm_xfer_ctx *c)
1185 struct bitstream bs;
1186 unsigned long plain_bits;
1193 /* may we use this feature? */
1195 use_rle = rcu_dereference(mdev->tconn->net_conf)->use_rle;
1197 if (!use_rle || mdev->tconn->agreed_pro_version < 90)
1200 if (c->bit_offset >= c->bm_bits)
1201 return 0; /* nothing to do. */
1203 /* use at most thus many bytes */
1204 bitstream_init(&bs, p->code, size, 0);
1205 memset(p->code, 0, size);
1206 /* plain bits covered in this code string */
1209 /* p->encoding & 0x80 stores whether the first run length is set.
1210 * bit offset is implicit.
1211 * start with toggle == 2 to be able to tell the first iteration */
1214 /* see how much plain bits we can stuff into one packet
1215 * using RLE and VLI. */
1217 tmp = (toggle == 0) ? _drbd_bm_find_next_zero(mdev, c->bit_offset)
1218 : _drbd_bm_find_next(mdev, c->bit_offset);
1221 rl = tmp - c->bit_offset;
1223 if (toggle == 2) { /* first iteration */
1225 /* the first checked bit was set,
1226 * store start value, */
1227 dcbp_set_start(p, 1);
1228 /* but skip encoding of zero run length */
1232 dcbp_set_start(p, 0);
1235 /* paranoia: catch zero runlength.
1236 * can only happen if bitmap is modified while we scan it. */
1238 dev_err(DEV, "unexpected zero runlength while encoding bitmap "
1239 "t:%u bo:%lu\n", toggle, c->bit_offset);
1243 bits = vli_encode_bits(&bs, rl);
1244 if (bits == -ENOBUFS) /* buffer full */
1247 dev_err(DEV, "error while encoding bitmap: %d\n", bits);
1253 c->bit_offset = tmp;
1254 } while (c->bit_offset < c->bm_bits);
1256 len = bs.cur.b - p->code + !!bs.cur.bit;
1258 if (plain_bits < (len << 3)) {
1259 /* incompressible with this method.
1260 * we need to rewind both word and bit position. */
1261 c->bit_offset -= plain_bits;
1262 bm_xfer_ctx_bit_to_word_offset(c);
1263 c->bit_offset = c->word_offset * BITS_PER_LONG;
1267 /* RLE + VLI was able to compress it just fine.
1268 * update c->word_offset. */
1269 bm_xfer_ctx_bit_to_word_offset(c);
1271 /* store pad_bits */
1272 dcbp_set_pad_bits(p, (8 - bs.cur.bit) & 0x7);
1278 * send_bitmap_rle_or_plain
1280 * Return 0 when done, 1 when another iteration is needed, and a negative error
1281 * code upon failure.
1284 send_bitmap_rle_or_plain(struct drbd_conf *mdev, struct bm_xfer_ctx *c)
1286 struct drbd_socket *sock = &mdev->tconn->data;
1287 unsigned int header_size = drbd_header_size(mdev->tconn);
1288 struct p_compressed_bm *p = sock->sbuf + header_size;
1291 len = fill_bitmap_rle_bits(mdev, p,
1292 DRBD_SOCKET_BUFFER_SIZE - header_size - sizeof(*p), c);
1297 dcbp_set_code(p, RLE_VLI_Bits);
1298 err = __send_command(mdev->tconn, mdev->vnr, sock,
1299 P_COMPRESSED_BITMAP, sizeof(*p) + len,
1302 c->bytes[0] += header_size + sizeof(*p) + len;
1304 if (c->bit_offset >= c->bm_bits)
1307 /* was not compressible.
1308 * send a buffer full of plain text bits instead. */
1309 unsigned int data_size;
1310 unsigned long num_words;
1311 unsigned long *p = sock->sbuf + header_size;
1313 data_size = DRBD_SOCKET_BUFFER_SIZE - header_size;
1314 num_words = min_t(size_t, data_size / sizeof(*p),
1315 c->bm_words - c->word_offset);
1316 len = num_words * sizeof(*p);
1318 drbd_bm_get_lel(mdev, c->word_offset, num_words, p);
1319 err = __send_command(mdev->tconn, mdev->vnr, sock, P_BITMAP, len, NULL, 0);
1320 c->word_offset += num_words;
1321 c->bit_offset = c->word_offset * BITS_PER_LONG;
1324 c->bytes[1] += header_size + len;
1326 if (c->bit_offset > c->bm_bits)
1327 c->bit_offset = c->bm_bits;
1331 INFO_bm_xfer_stats(mdev, "send", c);
1339 /* See the comment at receive_bitmap() */
1340 static int _drbd_send_bitmap(struct drbd_conf *mdev)
1342 struct bm_xfer_ctx c;
1345 if (!expect(mdev->bitmap))
1348 if (get_ldev(mdev)) {
1349 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
1350 dev_info(DEV, "Writing the whole bitmap, MDF_FullSync was set.\n");
1351 drbd_bm_set_all(mdev);
1352 if (drbd_bm_write(mdev)) {
1353 /* write_bm did fail! Leave full sync flag set in Meta P_DATA
1354 * but otherwise process as per normal - need to tell other
1355 * side that a full resync is required! */
1356 dev_err(DEV, "Failed to write bitmap to disk!\n");
1358 drbd_md_clear_flag(mdev, MDF_FULL_SYNC);
1365 c = (struct bm_xfer_ctx) {
1366 .bm_bits = drbd_bm_bits(mdev),
1367 .bm_words = drbd_bm_words(mdev),
1371 err = send_bitmap_rle_or_plain(mdev, &c);
1377 int drbd_send_bitmap(struct drbd_conf *mdev)
1379 struct drbd_socket *sock = &mdev->tconn->data;
1382 mutex_lock(&sock->mutex);
1384 err = !_drbd_send_bitmap(mdev);
1385 mutex_unlock(&sock->mutex);
1389 void drbd_send_b_ack(struct drbd_conf *mdev, u32 barrier_nr, u32 set_size)
1391 struct drbd_socket *sock;
1392 struct p_barrier_ack *p;
1394 if (mdev->state.conn < C_CONNECTED)
1397 sock = &mdev->tconn->meta;
1398 p = drbd_prepare_command(mdev, sock);
1401 p->barrier = barrier_nr;
1402 p->set_size = cpu_to_be32(set_size);
1403 drbd_send_command(mdev, sock, P_BARRIER_ACK, sizeof(*p), NULL, 0);
1407 * _drbd_send_ack() - Sends an ack packet
1408 * @mdev: DRBD device.
1409 * @cmd: Packet command code.
1410 * @sector: sector, needs to be in big endian byte order
1411 * @blksize: size in byte, needs to be in big endian byte order
1412 * @block_id: Id, big endian byte order
1414 static int _drbd_send_ack(struct drbd_conf *mdev, enum drbd_packet cmd,
1415 u64 sector, u32 blksize, u64 block_id)
1417 struct drbd_socket *sock;
1418 struct p_block_ack *p;
1420 if (mdev->state.conn < C_CONNECTED)
1423 sock = &mdev->tconn->meta;
1424 p = drbd_prepare_command(mdev, sock);
1428 p->block_id = block_id;
1429 p->blksize = blksize;
1430 p->seq_num = cpu_to_be32(atomic_inc_return(&mdev->packet_seq));
1431 return drbd_send_command(mdev, sock, cmd, sizeof(*p), NULL, 0);
1434 /* dp->sector and dp->block_id already/still in network byte order,
1435 * data_size is payload size according to dp->head,
1436 * and may need to be corrected for digest size. */
1437 void drbd_send_ack_dp(struct drbd_conf *mdev, enum drbd_packet cmd,
1438 struct p_data *dp, int data_size)
1440 if (mdev->tconn->peer_integrity_tfm)
1441 data_size -= crypto_hash_digestsize(mdev->tconn->peer_integrity_tfm);
1442 _drbd_send_ack(mdev, cmd, dp->sector, cpu_to_be32(data_size),
1446 void drbd_send_ack_rp(struct drbd_conf *mdev, enum drbd_packet cmd,
1447 struct p_block_req *rp)
1449 _drbd_send_ack(mdev, cmd, rp->sector, rp->blksize, rp->block_id);
1453 * drbd_send_ack() - Sends an ack packet
1454 * @mdev: DRBD device
1455 * @cmd: packet command code
1456 * @peer_req: peer request
1458 int drbd_send_ack(struct drbd_conf *mdev, enum drbd_packet cmd,
1459 struct drbd_peer_request *peer_req)
1461 return _drbd_send_ack(mdev, cmd,
1462 cpu_to_be64(peer_req->i.sector),
1463 cpu_to_be32(peer_req->i.size),
1464 peer_req->block_id);
1467 /* This function misuses the block_id field to signal if the blocks
1468 * are is sync or not. */
1469 int drbd_send_ack_ex(struct drbd_conf *mdev, enum drbd_packet cmd,
1470 sector_t sector, int blksize, u64 block_id)
1472 return _drbd_send_ack(mdev, cmd,
1473 cpu_to_be64(sector),
1474 cpu_to_be32(blksize),
1475 cpu_to_be64(block_id));
1478 int drbd_send_drequest(struct drbd_conf *mdev, int cmd,
1479 sector_t sector, int size, u64 block_id)
1481 struct drbd_socket *sock;
1482 struct p_block_req *p;
1484 sock = &mdev->tconn->data;
1485 p = drbd_prepare_command(mdev, sock);
1488 p->sector = cpu_to_be64(sector);
1489 p->block_id = block_id;
1490 p->blksize = cpu_to_be32(size);
1491 return drbd_send_command(mdev, sock, cmd, sizeof(*p), NULL, 0);
1494 int drbd_send_drequest_csum(struct drbd_conf *mdev, sector_t sector, int size,
1495 void *digest, int digest_size, enum drbd_packet cmd)
1497 struct drbd_socket *sock;
1498 struct p_block_req *p;
1500 /* FIXME: Put the digest into the preallocated socket buffer. */
1502 sock = &mdev->tconn->data;
1503 p = drbd_prepare_command(mdev, sock);
1506 p->sector = cpu_to_be64(sector);
1507 p->block_id = ID_SYNCER /* unused */;
1508 p->blksize = cpu_to_be32(size);
1509 return drbd_send_command(mdev, sock, cmd, sizeof(*p),
1510 digest, digest_size);
1513 int drbd_send_ov_request(struct drbd_conf *mdev, sector_t sector, int size)
1515 struct drbd_socket *sock;
1516 struct p_block_req *p;
1518 sock = &mdev->tconn->data;
1519 p = drbd_prepare_command(mdev, sock);
1522 p->sector = cpu_to_be64(sector);
1523 p->block_id = ID_SYNCER /* unused */;
1524 p->blksize = cpu_to_be32(size);
1525 return drbd_send_command(mdev, sock, P_OV_REQUEST, sizeof(*p), NULL, 0);
1528 /* called on sndtimeo
1529 * returns false if we should retry,
1530 * true if we think connection is dead
1532 static int we_should_drop_the_connection(struct drbd_tconn *tconn, struct socket *sock)
1535 /* long elapsed = (long)(jiffies - mdev->last_received); */
1537 drop_it = tconn->meta.socket == sock
1538 || !tconn->asender.task
1539 || get_t_state(&tconn->asender) != RUNNING
1540 || tconn->cstate < C_WF_REPORT_PARAMS;
1545 drop_it = !--tconn->ko_count;
1547 conn_err(tconn, "[%s/%d] sock_sendmsg time expired, ko = %u\n",
1548 current->comm, current->pid, tconn->ko_count);
1549 request_ping(tconn);
1552 return drop_it; /* && (mdev->state == R_PRIMARY) */;
1555 static void drbd_update_congested(struct drbd_tconn *tconn)
1557 struct sock *sk = tconn->data.socket->sk;
1558 if (sk->sk_wmem_queued > sk->sk_sndbuf * 4 / 5)
1559 set_bit(NET_CONGESTED, &tconn->flags);
1562 /* The idea of sendpage seems to be to put some kind of reference
1563 * to the page into the skb, and to hand it over to the NIC. In
1564 * this process get_page() gets called.
1566 * As soon as the page was really sent over the network put_page()
1567 * gets called by some part of the network layer. [ NIC driver? ]
1569 * [ get_page() / put_page() increment/decrement the count. If count
1570 * reaches 0 the page will be freed. ]
1572 * This works nicely with pages from FSs.
1573 * But this means that in protocol A we might signal IO completion too early!
1575 * In order not to corrupt data during a resync we must make sure
1576 * that we do not reuse our own buffer pages (EEs) to early, therefore
1577 * we have the net_ee list.
1579 * XFS seems to have problems, still, it submits pages with page_count == 0!
1580 * As a workaround, we disable sendpage on pages
1581 * with page_count == 0 or PageSlab.
1583 static int _drbd_no_send_page(struct drbd_conf *mdev, struct page *page,
1584 int offset, size_t size, unsigned msg_flags)
1586 struct socket *socket;
1590 socket = mdev->tconn->data.socket;
1591 addr = kmap(page) + offset;
1592 err = drbd_send_all(mdev->tconn, socket, addr, size, msg_flags);
1595 mdev->send_cnt += size >> 9;
1599 static int _drbd_send_page(struct drbd_conf *mdev, struct page *page,
1600 int offset, size_t size, unsigned msg_flags)
1602 struct socket *socket = mdev->tconn->data.socket;
1603 mm_segment_t oldfs = get_fs();
1607 /* e.g. XFS meta- & log-data is in slab pages, which have a
1608 * page_count of 0 and/or have PageSlab() set.
1609 * we cannot use send_page for those, as that does get_page();
1610 * put_page(); and would cause either a VM_BUG directly, or
1611 * __page_cache_release a page that would actually still be referenced
1612 * by someone, leading to some obscure delayed Oops somewhere else. */
1613 if (disable_sendpage || (page_count(page) < 1) || PageSlab(page))
1614 return _drbd_no_send_page(mdev, page, offset, size, msg_flags);
1616 msg_flags |= MSG_NOSIGNAL;
1617 drbd_update_congested(mdev->tconn);
1622 sent = socket->ops->sendpage(socket, page, offset, len, msg_flags);
1624 if (sent == -EAGAIN) {
1625 if (we_should_drop_the_connection(mdev->tconn, socket))
1629 dev_warn(DEV, "%s: size=%d len=%d sent=%d\n",
1630 __func__, (int)size, len, sent);
1637 } while (len > 0 /* THINK && mdev->cstate >= C_CONNECTED*/);
1639 clear_bit(NET_CONGESTED, &mdev->tconn->flags);
1643 mdev->send_cnt += size >> 9;
1648 static int _drbd_send_bio(struct drbd_conf *mdev, struct bio *bio)
1650 struct bio_vec *bvec;
1652 /* hint all but last page with MSG_MORE */
1653 __bio_for_each_segment(bvec, bio, i, 0) {
1656 err = _drbd_no_send_page(mdev, bvec->bv_page,
1657 bvec->bv_offset, bvec->bv_len,
1658 i == bio->bi_vcnt - 1 ? 0 : MSG_MORE);
1665 static int _drbd_send_zc_bio(struct drbd_conf *mdev, struct bio *bio)
1667 struct bio_vec *bvec;
1669 /* hint all but last page with MSG_MORE */
1670 __bio_for_each_segment(bvec, bio, i, 0) {
1673 err = _drbd_send_page(mdev, bvec->bv_page,
1674 bvec->bv_offset, bvec->bv_len,
1675 i == bio->bi_vcnt - 1 ? 0 : MSG_MORE);
1682 static int _drbd_send_zc_ee(struct drbd_conf *mdev,
1683 struct drbd_peer_request *peer_req)
1685 struct page *page = peer_req->pages;
1686 unsigned len = peer_req->i.size;
1689 /* hint all but last page with MSG_MORE */
1690 page_chain_for_each(page) {
1691 unsigned l = min_t(unsigned, len, PAGE_SIZE);
1693 err = _drbd_send_page(mdev, page, 0, l,
1694 page_chain_next(page) ? MSG_MORE : 0);
1702 static u32 bio_flags_to_wire(struct drbd_conf *mdev, unsigned long bi_rw)
1704 if (mdev->tconn->agreed_pro_version >= 95)
1705 return (bi_rw & REQ_SYNC ? DP_RW_SYNC : 0) |
1706 (bi_rw & REQ_FUA ? DP_FUA : 0) |
1707 (bi_rw & REQ_FLUSH ? DP_FLUSH : 0) |
1708 (bi_rw & REQ_DISCARD ? DP_DISCARD : 0);
1710 return bi_rw & REQ_SYNC ? DP_RW_SYNC : 0;
1713 /* Used to send write requests
1714 * R_PRIMARY -> Peer (P_DATA)
1716 int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req)
1718 struct drbd_socket *sock;
1720 unsigned int dp_flags = 0;
1724 dgs = (mdev->tconn->agreed_pro_version >= 87 && mdev->tconn->integrity_tfm) ?
1725 crypto_hash_digestsize(mdev->tconn->integrity_tfm) : 0;
1727 sock = &mdev->tconn->data;
1728 p = drbd_prepare_command(mdev, sock);
1731 p->sector = cpu_to_be64(req->i.sector);
1732 p->block_id = (unsigned long)req;
1733 p->seq_num = cpu_to_be32(req->seq_num = atomic_inc_return(&mdev->packet_seq));
1734 dp_flags = bio_flags_to_wire(mdev, req->master_bio->bi_rw);
1735 if (mdev->state.conn >= C_SYNC_SOURCE &&
1736 mdev->state.conn <= C_PAUSED_SYNC_T)
1737 dp_flags |= DP_MAY_SET_IN_SYNC;
1738 if (mdev->tconn->agreed_pro_version >= 100) {
1739 if (req->rq_state & RQ_EXP_RECEIVE_ACK)
1740 dp_flags |= DP_SEND_RECEIVE_ACK;
1741 if (req->rq_state & RQ_EXP_WRITE_ACK)
1742 dp_flags |= DP_SEND_WRITE_ACK;
1744 p->dp_flags = cpu_to_be32(dp_flags);
1746 drbd_csum_bio(mdev, mdev->tconn->integrity_tfm, req->master_bio, p + 1);
1747 err = __send_command(mdev->tconn, mdev->vnr, sock, P_DATA, sizeof(*p) + dgs, NULL, req->i.size);
1749 /* For protocol A, we have to memcpy the payload into
1750 * socket buffers, as we may complete right away
1751 * as soon as we handed it over to tcp, at which point the data
1752 * pages may become invalid.
1754 * For data-integrity enabled, we copy it as well, so we can be
1755 * sure that even if the bio pages may still be modified, it
1756 * won't change the data on the wire, thus if the digest checks
1757 * out ok after sending on this side, but does not fit on the
1758 * receiving side, we sure have detected corruption elsewhere.
1760 if (!(req->rq_state & (RQ_EXP_RECEIVE_ACK | RQ_EXP_WRITE_ACK)) || dgs)
1761 err = _drbd_send_bio(mdev, req->master_bio);
1763 err = _drbd_send_zc_bio(mdev, req->master_bio);
1765 /* double check digest, sometimes buffers have been modified in flight. */
1766 if (dgs > 0 && dgs <= 64) {
1767 /* 64 byte, 512 bit, is the largest digest size
1768 * currently supported in kernel crypto. */
1769 unsigned char digest[64];
1770 drbd_csum_bio(mdev, mdev->tconn->integrity_tfm, req->master_bio, digest);
1771 if (memcmp(p + 1, digest, dgs)) {
1773 "Digest mismatch, buffer modified by upper layers during write: %llus +%u\n",
1774 (unsigned long long)req->i.sector, req->i.size);
1776 } /* else if (dgs > 64) {
1777 ... Be noisy about digest too large ...
1780 mutex_unlock(&sock->mutex); /* locked by drbd_prepare_command() */
1785 /* answer packet, used to send data back for read requests:
1786 * Peer -> (diskless) R_PRIMARY (P_DATA_REPLY)
1787 * C_SYNC_SOURCE -> C_SYNC_TARGET (P_RS_DATA_REPLY)
1789 int drbd_send_block(struct drbd_conf *mdev, enum drbd_packet cmd,
1790 struct drbd_peer_request *peer_req)
1792 struct drbd_socket *sock;
1797 dgs = (mdev->tconn->agreed_pro_version >= 87 && mdev->tconn->integrity_tfm) ?
1798 crypto_hash_digestsize(mdev->tconn->integrity_tfm) : 0;
1800 sock = &mdev->tconn->data;
1801 p = drbd_prepare_command(mdev, sock);
1804 p->sector = cpu_to_be64(peer_req->i.sector);
1805 p->block_id = peer_req->block_id;
1806 p->seq_num = 0; /* unused */
1808 drbd_csum_ee(mdev, mdev->tconn->integrity_tfm, peer_req, p + 1);
1809 err = __send_command(mdev->tconn, mdev->vnr, sock, cmd, sizeof(*p) + dgs, NULL, peer_req->i.size);
1811 err = _drbd_send_zc_ee(mdev, peer_req);
1812 mutex_unlock(&sock->mutex); /* locked by drbd_prepare_command() */
1817 int drbd_send_out_of_sync(struct drbd_conf *mdev, struct drbd_request *req)
1819 struct drbd_socket *sock;
1820 struct p_block_desc *p;
1822 sock = &mdev->tconn->data;
1823 p = drbd_prepare_command(mdev, sock);
1826 p->sector = cpu_to_be64(req->i.sector);
1827 p->blksize = cpu_to_be32(req->i.size);
1828 return drbd_send_command(mdev, sock, P_OUT_OF_SYNC, sizeof(*p), NULL, 0);
1832 drbd_send distinguishes two cases:
1834 Packets sent via the data socket "sock"
1835 and packets sent via the meta data socket "msock"
1838 -----------------+-------------------------+------------------------------
1839 timeout conf.timeout / 2 conf.timeout / 2
1840 timeout action send a ping via msock Abort communication
1841 and close all sockets
1845 * you must have down()ed the appropriate [m]sock_mutex elsewhere!
1847 int drbd_send(struct drbd_tconn *tconn, struct socket *sock,
1848 void *buf, size_t size, unsigned msg_flags)
1857 /* THINK if (signal_pending) return ... ? */
1862 msg.msg_name = NULL;
1863 msg.msg_namelen = 0;
1864 msg.msg_control = NULL;
1865 msg.msg_controllen = 0;
1866 msg.msg_flags = msg_flags | MSG_NOSIGNAL;
1868 if (sock == tconn->data.socket) {
1870 tconn->ko_count = rcu_dereference(tconn->net_conf)->ko_count;
1872 drbd_update_congested(tconn);
1876 * tcp_sendmsg does _not_ use its size parameter at all ?
1878 * -EAGAIN on timeout, -EINTR on signal.
1881 * do we need to block DRBD_SIG if sock == &meta.socket ??
1882 * otherwise wake_asender() might interrupt some send_*Ack !
1884 rv = kernel_sendmsg(sock, &msg, &iov, 1, size);
1885 if (rv == -EAGAIN) {
1886 if (we_should_drop_the_connection(tconn, sock))
1892 flush_signals(current);
1900 } while (sent < size);
1902 if (sock == tconn->data.socket)
1903 clear_bit(NET_CONGESTED, &tconn->flags);
1906 if (rv != -EAGAIN) {
1907 conn_err(tconn, "%s_sendmsg returned %d\n",
1908 sock == tconn->meta.socket ? "msock" : "sock",
1910 conn_request_state(tconn, NS(conn, C_BROKEN_PIPE), CS_HARD);
1912 conn_request_state(tconn, NS(conn, C_TIMEOUT), CS_HARD);
1919 * drbd_send_all - Send an entire buffer
1921 * Returns 0 upon success and a negative error value otherwise.
1923 int drbd_send_all(struct drbd_tconn *tconn, struct socket *sock, void *buffer,
1924 size_t size, unsigned msg_flags)
1928 err = drbd_send(tconn, sock, buffer, size, msg_flags);
1936 static int drbd_open(struct block_device *bdev, fmode_t mode)
1938 struct drbd_conf *mdev = bdev->bd_disk->private_data;
1939 unsigned long flags;
1942 mutex_lock(&drbd_main_mutex);
1943 spin_lock_irqsave(&mdev->tconn->req_lock, flags);
1944 /* to have a stable mdev->state.role
1945 * and no race with updating open_cnt */
1947 if (mdev->state.role != R_PRIMARY) {
1948 if (mode & FMODE_WRITE)
1950 else if (!allow_oos)
1956 spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
1957 mutex_unlock(&drbd_main_mutex);
1962 static int drbd_release(struct gendisk *gd, fmode_t mode)
1964 struct drbd_conf *mdev = gd->private_data;
1965 mutex_lock(&drbd_main_mutex);
1967 mutex_unlock(&drbd_main_mutex);
1971 static void drbd_set_defaults(struct drbd_conf *mdev)
1973 /* Beware! The actual layout differs
1974 * between big endian and little endian */
1975 mdev->state = (union drbd_dev_state) {
1976 { .role = R_SECONDARY,
1978 .conn = C_STANDALONE,
1984 void drbd_init_set_defaults(struct drbd_conf *mdev)
1986 /* the memset(,0,) did most of this.
1987 * note: only assignments, no allocation in here */
1989 drbd_set_defaults(mdev);
1991 atomic_set(&mdev->ap_bio_cnt, 0);
1992 atomic_set(&mdev->ap_pending_cnt, 0);
1993 atomic_set(&mdev->rs_pending_cnt, 0);
1994 atomic_set(&mdev->unacked_cnt, 0);
1995 atomic_set(&mdev->local_cnt, 0);
1996 atomic_set(&mdev->pp_in_use_by_net, 0);
1997 atomic_set(&mdev->rs_sect_in, 0);
1998 atomic_set(&mdev->rs_sect_ev, 0);
1999 atomic_set(&mdev->ap_in_flight, 0);
2001 mutex_init(&mdev->md_io_mutex);
2002 mutex_init(&mdev->own_state_mutex);
2003 mdev->state_mutex = &mdev->own_state_mutex;
2005 spin_lock_init(&mdev->al_lock);
2006 spin_lock_init(&mdev->peer_seq_lock);
2007 spin_lock_init(&mdev->epoch_lock);
2009 INIT_LIST_HEAD(&mdev->active_ee);
2010 INIT_LIST_HEAD(&mdev->sync_ee);
2011 INIT_LIST_HEAD(&mdev->done_ee);
2012 INIT_LIST_HEAD(&mdev->read_ee);
2013 INIT_LIST_HEAD(&mdev->net_ee);
2014 INIT_LIST_HEAD(&mdev->resync_reads);
2015 INIT_LIST_HEAD(&mdev->resync_work.list);
2016 INIT_LIST_HEAD(&mdev->unplug_work.list);
2017 INIT_LIST_HEAD(&mdev->go_diskless.list);
2018 INIT_LIST_HEAD(&mdev->md_sync_work.list);
2019 INIT_LIST_HEAD(&mdev->start_resync_work.list);
2020 INIT_LIST_HEAD(&mdev->bm_io_work.w.list);
2022 mdev->resync_work.cb = w_resync_timer;
2023 mdev->unplug_work.cb = w_send_write_hint;
2024 mdev->go_diskless.cb = w_go_diskless;
2025 mdev->md_sync_work.cb = w_md_sync;
2026 mdev->bm_io_work.w.cb = w_bitmap_io;
2027 mdev->start_resync_work.cb = w_start_resync;
2029 mdev->resync_work.mdev = mdev;
2030 mdev->unplug_work.mdev = mdev;
2031 mdev->go_diskless.mdev = mdev;
2032 mdev->md_sync_work.mdev = mdev;
2033 mdev->bm_io_work.w.mdev = mdev;
2034 mdev->start_resync_work.mdev = mdev;
2036 init_timer(&mdev->resync_timer);
2037 init_timer(&mdev->md_sync_timer);
2038 init_timer(&mdev->start_resync_timer);
2039 init_timer(&mdev->request_timer);
2040 mdev->resync_timer.function = resync_timer_fn;
2041 mdev->resync_timer.data = (unsigned long) mdev;
2042 mdev->md_sync_timer.function = md_sync_timer_fn;
2043 mdev->md_sync_timer.data = (unsigned long) mdev;
2044 mdev->start_resync_timer.function = start_resync_timer_fn;
2045 mdev->start_resync_timer.data = (unsigned long) mdev;
2046 mdev->request_timer.function = request_timer_fn;
2047 mdev->request_timer.data = (unsigned long) mdev;
2049 init_waitqueue_head(&mdev->misc_wait);
2050 init_waitqueue_head(&mdev->state_wait);
2051 init_waitqueue_head(&mdev->ee_wait);
2052 init_waitqueue_head(&mdev->al_wait);
2053 init_waitqueue_head(&mdev->seq_wait);
2055 /* mdev->tconn->agreed_pro_version gets initialized in drbd_connect() */
2056 mdev->write_ordering = WO_bdev_flush;
2057 mdev->resync_wenr = LC_FREE;
2058 mdev->peer_max_bio_size = DRBD_MAX_BIO_SIZE_SAFE;
2059 mdev->local_max_bio_size = DRBD_MAX_BIO_SIZE_SAFE;
2062 void drbd_mdev_cleanup(struct drbd_conf *mdev)
2065 if (mdev->tconn->receiver.t_state != NONE)
2066 dev_err(DEV, "ASSERT FAILED: receiver t_state == %d expected 0.\n",
2067 mdev->tconn->receiver.t_state);
2069 /* no need to lock it, I'm the only thread alive */
2070 if (atomic_read(&mdev->current_epoch->epoch_size) != 0)
2071 dev_err(DEV, "epoch_size:%d\n", atomic_read(&mdev->current_epoch->epoch_size));
2081 mdev->rs_failed = 0;
2082 mdev->rs_last_events = 0;
2083 mdev->rs_last_sect_ev = 0;
2084 for (i = 0; i < DRBD_SYNC_MARKS; i++) {
2085 mdev->rs_mark_left[i] = 0;
2086 mdev->rs_mark_time[i] = 0;
2088 D_ASSERT(mdev->tconn->net_conf == NULL);
2090 drbd_set_my_capacity(mdev, 0);
2092 /* maybe never allocated. */
2093 drbd_bm_resize(mdev, 0, 1);
2094 drbd_bm_cleanup(mdev);
2097 drbd_free_bc(mdev->ldev);
2100 clear_bit(AL_SUSPENDED, &mdev->flags);
2102 D_ASSERT(list_empty(&mdev->active_ee));
2103 D_ASSERT(list_empty(&mdev->sync_ee));
2104 D_ASSERT(list_empty(&mdev->done_ee));
2105 D_ASSERT(list_empty(&mdev->read_ee));
2106 D_ASSERT(list_empty(&mdev->net_ee));
2107 D_ASSERT(list_empty(&mdev->resync_reads));
2108 D_ASSERT(list_empty(&mdev->tconn->data.work.q));
2109 D_ASSERT(list_empty(&mdev->tconn->meta.work.q));
2110 D_ASSERT(list_empty(&mdev->resync_work.list));
2111 D_ASSERT(list_empty(&mdev->unplug_work.list));
2112 D_ASSERT(list_empty(&mdev->go_diskless.list));
2114 drbd_set_defaults(mdev);
2118 static void drbd_destroy_mempools(void)
2122 while (drbd_pp_pool) {
2123 page = drbd_pp_pool;
2124 drbd_pp_pool = (struct page *)page_private(page);
2129 /* D_ASSERT(atomic_read(&drbd_pp_vacant)==0); */
2131 if (drbd_md_io_bio_set)
2132 bioset_free(drbd_md_io_bio_set);
2133 if (drbd_md_io_page_pool)
2134 mempool_destroy(drbd_md_io_page_pool);
2135 if (drbd_ee_mempool)
2136 mempool_destroy(drbd_ee_mempool);
2137 if (drbd_request_mempool)
2138 mempool_destroy(drbd_request_mempool);
2140 kmem_cache_destroy(drbd_ee_cache);
2141 if (drbd_request_cache)
2142 kmem_cache_destroy(drbd_request_cache);
2143 if (drbd_bm_ext_cache)
2144 kmem_cache_destroy(drbd_bm_ext_cache);
2145 if (drbd_al_ext_cache)
2146 kmem_cache_destroy(drbd_al_ext_cache);
2148 drbd_md_io_bio_set = NULL;
2149 drbd_md_io_page_pool = NULL;
2150 drbd_ee_mempool = NULL;
2151 drbd_request_mempool = NULL;
2152 drbd_ee_cache = NULL;
2153 drbd_request_cache = NULL;
2154 drbd_bm_ext_cache = NULL;
2155 drbd_al_ext_cache = NULL;
2160 static int drbd_create_mempools(void)
2163 const int number = (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * minor_count;
2166 /* prepare our caches and mempools */
2167 drbd_request_mempool = NULL;
2168 drbd_ee_cache = NULL;
2169 drbd_request_cache = NULL;
2170 drbd_bm_ext_cache = NULL;
2171 drbd_al_ext_cache = NULL;
2172 drbd_pp_pool = NULL;
2173 drbd_md_io_page_pool = NULL;
2174 drbd_md_io_bio_set = NULL;
2177 drbd_request_cache = kmem_cache_create(
2178 "drbd_req", sizeof(struct drbd_request), 0, 0, NULL);
2179 if (drbd_request_cache == NULL)
2182 drbd_ee_cache = kmem_cache_create(
2183 "drbd_ee", sizeof(struct drbd_peer_request), 0, 0, NULL);
2184 if (drbd_ee_cache == NULL)
2187 drbd_bm_ext_cache = kmem_cache_create(
2188 "drbd_bm", sizeof(struct bm_extent), 0, 0, NULL);
2189 if (drbd_bm_ext_cache == NULL)
2192 drbd_al_ext_cache = kmem_cache_create(
2193 "drbd_al", sizeof(struct lc_element), 0, 0, NULL);
2194 if (drbd_al_ext_cache == NULL)
2198 drbd_md_io_bio_set = bioset_create(DRBD_MIN_POOL_PAGES, 0);
2199 if (drbd_md_io_bio_set == NULL)
2202 drbd_md_io_page_pool = mempool_create_page_pool(DRBD_MIN_POOL_PAGES, 0);
2203 if (drbd_md_io_page_pool == NULL)
2206 drbd_request_mempool = mempool_create(number,
2207 mempool_alloc_slab, mempool_free_slab, drbd_request_cache);
2208 if (drbd_request_mempool == NULL)
2211 drbd_ee_mempool = mempool_create(number,
2212 mempool_alloc_slab, mempool_free_slab, drbd_ee_cache);
2213 if (drbd_ee_mempool == NULL)
2216 /* drbd's page pool */
2217 spin_lock_init(&drbd_pp_lock);
2219 for (i = 0; i < number; i++) {
2220 page = alloc_page(GFP_HIGHUSER);
2223 set_page_private(page, (unsigned long)drbd_pp_pool);
2224 drbd_pp_pool = page;
2226 drbd_pp_vacant = number;
2231 drbd_destroy_mempools(); /* in case we allocated some */
2235 static int drbd_notify_sys(struct notifier_block *this, unsigned long code,
2238 /* just so we have it. you never know what interesting things we
2239 * might want to do here some day...
2245 static struct notifier_block drbd_notifier = {
2246 .notifier_call = drbd_notify_sys,
2249 static void drbd_release_all_peer_reqs(struct drbd_conf *mdev)
2253 rr = drbd_free_peer_reqs(mdev, &mdev->active_ee);
2255 dev_err(DEV, "%d EEs in active list found!\n", rr);
2257 rr = drbd_free_peer_reqs(mdev, &mdev->sync_ee);
2259 dev_err(DEV, "%d EEs in sync list found!\n", rr);
2261 rr = drbd_free_peer_reqs(mdev, &mdev->read_ee);
2263 dev_err(DEV, "%d EEs in read list found!\n", rr);
2265 rr = drbd_free_peer_reqs(mdev, &mdev->done_ee);
2267 dev_err(DEV, "%d EEs in done list found!\n", rr);
2269 rr = drbd_free_peer_reqs(mdev, &mdev->net_ee);
2271 dev_err(DEV, "%d EEs in net list found!\n", rr);
2274 /* caution. no locking. */
2275 void drbd_delete_device(struct drbd_conf *mdev)
2277 struct drbd_tconn *tconn = mdev->tconn;
2279 idr_remove(&mdev->tconn->volumes, mdev->vnr);
2280 idr_remove(&minors, mdev_to_minor(mdev));
2283 /* paranoia asserts */
2284 D_ASSERT(mdev->open_cnt == 0);
2285 D_ASSERT(list_empty(&mdev->tconn->data.work.q));
2286 /* end paranoia asserts */
2288 del_gendisk(mdev->vdisk);
2290 /* cleanup stuff that may have been allocated during
2291 * device (re-)configuration or state changes */
2293 if (mdev->this_bdev)
2294 bdput(mdev->this_bdev);
2296 drbd_free_bc(mdev->ldev);
2299 drbd_release_all_peer_reqs(mdev);
2301 lc_destroy(mdev->act_log);
2302 lc_destroy(mdev->resync);
2304 kfree(mdev->p_uuid);
2305 /* mdev->p_uuid = NULL; */
2307 kfree(mdev->current_epoch);
2308 if (mdev->bitmap) /* should no longer be there. */
2309 drbd_bm_cleanup(mdev);
2310 __free_page(mdev->md_io_page);
2311 put_disk(mdev->vdisk);
2312 blk_cleanup_queue(mdev->rq_queue);
2313 kfree(mdev->rs_plan_s);
2316 kref_put(&tconn->kref, &conn_destroy);
2319 static void drbd_cleanup(void)
2322 struct drbd_conf *mdev;
2324 unregister_reboot_notifier(&drbd_notifier);
2326 /* first remove proc,
2327 * drbdsetup uses it's presence to detect
2328 * whether DRBD is loaded.
2329 * If we would get stuck in proc removal,
2330 * but have netlink already deregistered,
2331 * some drbdsetup commands may wait forever
2335 remove_proc_entry("drbd", NULL);
2337 drbd_genl_unregister();
2339 down_write(&drbd_cfg_rwsem);
2340 idr_for_each_entry(&minors, mdev, i)
2341 drbd_delete_device(mdev);
2342 up_write(&drbd_cfg_rwsem);
2344 drbd_destroy_mempools();
2345 unregister_blkdev(DRBD_MAJOR, "drbd");
2347 idr_destroy(&minors);
2349 printk(KERN_INFO "drbd: module cleanup done.\n");
2353 * drbd_congested() - Callback for pdflush
2354 * @congested_data: User data
2355 * @bdi_bits: Bits pdflush is currently interested in
2357 * Returns 1<<BDI_async_congested and/or 1<<BDI_sync_congested if we are congested.
2359 static int drbd_congested(void *congested_data, int bdi_bits)
2361 struct drbd_conf *mdev = congested_data;
2362 struct request_queue *q;
2366 if (!may_inc_ap_bio(mdev)) {
2367 /* DRBD has frozen IO */
2373 if (get_ldev(mdev)) {
2374 q = bdev_get_queue(mdev->ldev->backing_bdev);
2375 r = bdi_congested(&q->backing_dev_info, bdi_bits);
2381 if (bdi_bits & (1 << BDI_async_congested) && test_bit(NET_CONGESTED, &mdev->tconn->flags)) {
2382 r |= (1 << BDI_async_congested);
2383 reason = reason == 'b' ? 'a' : 'n';
2387 mdev->congestion_reason = reason;
2391 static void drbd_init_workqueue(struct drbd_work_queue* wq)
2393 sema_init(&wq->s, 0);
2394 spin_lock_init(&wq->q_lock);
2395 INIT_LIST_HEAD(&wq->q);
2398 struct drbd_tconn *conn_get_by_name(const char *name)
2400 struct drbd_tconn *tconn;
2402 if (!name || !name[0])
2405 down_read(&drbd_cfg_rwsem);
2406 list_for_each_entry(tconn, &drbd_tconns, all_tconn) {
2407 if (!strcmp(tconn->name, name)) {
2408 kref_get(&tconn->kref);
2414 up_read(&drbd_cfg_rwsem);
2418 static int drbd_alloc_socket(struct drbd_socket *socket)
2420 socket->rbuf = (void *) __get_free_page(GFP_KERNEL);
2423 socket->sbuf = (void *) __get_free_page(GFP_KERNEL);
2429 static void drbd_free_socket(struct drbd_socket *socket)
2431 free_page((unsigned long) socket->sbuf);
2432 free_page((unsigned long) socket->rbuf);
2435 void conn_free_crypto(struct drbd_tconn *tconn)
2437 drbd_free_sock(tconn);
2439 crypto_free_hash(tconn->csums_tfm);
2440 crypto_free_hash(tconn->verify_tfm);
2441 crypto_free_hash(tconn->cram_hmac_tfm);
2442 crypto_free_hash(tconn->integrity_tfm);
2443 crypto_free_hash(tconn->peer_integrity_tfm);
2444 kfree(tconn->int_dig_in);
2445 kfree(tconn->int_dig_vv);
2447 tconn->csums_tfm = NULL;
2448 tconn->verify_tfm = NULL;
2449 tconn->cram_hmac_tfm = NULL;
2450 tconn->integrity_tfm = NULL;
2451 tconn->peer_integrity_tfm = NULL;
2452 tconn->int_dig_in = NULL;
2453 tconn->int_dig_vv = NULL;
2456 struct drbd_tconn *conn_create(const char *name)
2458 struct drbd_tconn *tconn;
2460 tconn = kzalloc(sizeof(struct drbd_tconn), GFP_KERNEL);
2464 tconn->name = kstrdup(name, GFP_KERNEL);
2468 if (drbd_alloc_socket(&tconn->data))
2470 if (drbd_alloc_socket(&tconn->meta))
2473 if (!zalloc_cpumask_var(&tconn->cpu_mask, GFP_KERNEL))
2476 if (!tl_init(tconn))
2479 tconn->cstate = C_STANDALONE;
2480 mutex_init(&tconn->cstate_mutex);
2481 spin_lock_init(&tconn->req_lock);
2482 mutex_init(&tconn->conf_update);
2483 init_waitqueue_head(&tconn->ping_wait);
2484 idr_init(&tconn->volumes);
2486 drbd_init_workqueue(&tconn->data.work);
2487 mutex_init(&tconn->data.mutex);
2489 drbd_init_workqueue(&tconn->meta.work);
2490 mutex_init(&tconn->meta.mutex);
2492 drbd_thread_init(tconn, &tconn->receiver, drbdd_init, "receiver");
2493 drbd_thread_init(tconn, &tconn->worker, drbd_worker, "worker");
2494 drbd_thread_init(tconn, &tconn->asender, drbd_asender, "asender");
2496 drbd_set_res_opts_defaults(&tconn->res_opts);
2498 down_write(&drbd_cfg_rwsem);
2499 kref_init(&tconn->kref);
2500 list_add_tail(&tconn->all_tconn, &drbd_tconns);
2501 up_write(&drbd_cfg_rwsem);
2507 free_cpumask_var(tconn->cpu_mask);
2508 drbd_free_socket(&tconn->meta);
2509 drbd_free_socket(&tconn->data);
2516 void conn_destroy(struct kref *kref)
2518 struct drbd_tconn *tconn = container_of(kref, struct drbd_tconn, kref);
2520 idr_destroy(&tconn->volumes);
2522 free_cpumask_var(tconn->cpu_mask);
2523 drbd_free_socket(&tconn->meta);
2524 drbd_free_socket(&tconn->data);
2526 kfree(tconn->int_dig_in);
2527 kfree(tconn->int_dig_vv);
2531 enum drbd_ret_code conn_new_minor(struct drbd_tconn *tconn, unsigned int minor, int vnr)
2533 struct drbd_conf *mdev;
2534 struct gendisk *disk;
2535 struct request_queue *q;
2537 int minor_got = minor;
2538 enum drbd_ret_code err = ERR_NOMEM;
2540 mdev = minor_to_mdev(minor);
2542 return ERR_MINOR_EXISTS;
2544 /* GFP_KERNEL, we are outside of all write-out paths */
2545 mdev = kzalloc(sizeof(struct drbd_conf), GFP_KERNEL);
2549 kref_get(&tconn->kref);
2550 mdev->tconn = tconn;
2552 mdev->minor = minor;
2555 drbd_init_set_defaults(mdev);
2557 q = blk_alloc_queue(GFP_KERNEL);
2561 q->queuedata = mdev;
2563 disk = alloc_disk(1);
2568 set_disk_ro(disk, true);
2571 disk->major = DRBD_MAJOR;
2572 disk->first_minor = minor;
2573 disk->fops = &drbd_ops;
2574 sprintf(disk->disk_name, "drbd%d", minor);
2575 disk->private_data = mdev;
2577 mdev->this_bdev = bdget(MKDEV(DRBD_MAJOR, minor));
2578 /* we have no partitions. we contain only ourselves. */
2579 mdev->this_bdev->bd_contains = mdev->this_bdev;
2581 q->backing_dev_info.congested_fn = drbd_congested;
2582 q->backing_dev_info.congested_data = mdev;
2584 blk_queue_make_request(q, drbd_make_request);
2585 /* Setting the max_hw_sectors to an odd value of 8kibyte here
2586 This triggers a max_bio_size message upon first attach or connect */
2587 blk_queue_max_hw_sectors(q, DRBD_MAX_BIO_SIZE_SAFE >> 8);
2588 blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
2589 blk_queue_merge_bvec(q, drbd_merge_bvec);
2590 q->queue_lock = &mdev->tconn->req_lock; /* needed since we use */
2592 mdev->md_io_page = alloc_page(GFP_KERNEL);
2593 if (!mdev->md_io_page)
2594 goto out_no_io_page;
2596 if (drbd_bm_init(mdev))
2598 mdev->read_requests = RB_ROOT;
2599 mdev->write_requests = RB_ROOT;
2601 mdev->current_epoch = kzalloc(sizeof(struct drbd_epoch), GFP_KERNEL);
2602 if (!mdev->current_epoch)
2605 INIT_LIST_HEAD(&mdev->current_epoch->list);
2608 if (!idr_pre_get(&minors, GFP_KERNEL))
2609 goto out_no_minor_idr;
2610 if (idr_get_new_above(&minors, mdev, minor, &minor_got))
2611 goto out_no_minor_idr;
2612 if (minor_got != minor) {
2613 err = ERR_MINOR_EXISTS;
2614 drbd_msg_put_info("requested minor exists already");
2615 goto out_idr_remove_minor;
2618 if (!idr_pre_get(&tconn->volumes, GFP_KERNEL))
2619 goto out_idr_remove_minor;
2620 if (idr_get_new_above(&tconn->volumes, mdev, vnr, &vnr_got))
2621 goto out_idr_remove_minor;
2622 if (vnr_got != vnr) {
2623 err = ERR_INVALID_REQUEST;
2624 drbd_msg_put_info("requested volume exists already");
2625 goto out_idr_remove_vol;
2629 /* inherit the connection state */
2630 mdev->state.conn = tconn->cstate;
2631 if (mdev->state.conn == C_WF_REPORT_PARAMS)
2632 drbd_connected(vnr, mdev, tconn);
2637 idr_remove(&tconn->volumes, vnr_got);
2638 out_idr_remove_minor:
2639 idr_remove(&minors, minor_got);
2642 kfree(mdev->current_epoch);
2644 drbd_bm_cleanup(mdev);
2646 __free_page(mdev->md_io_page);
2650 blk_cleanup_queue(q);
2653 kref_put(&tconn->kref, &conn_destroy);
2657 int __init drbd_init(void)
2661 if (minor_count < DRBD_MINOR_COUNT_MIN || minor_count > DRBD_MINOR_COUNT_MAX) {
2663 "drbd: invalid minor_count (%d)\n", minor_count);
2671 err = register_blkdev(DRBD_MAJOR, "drbd");
2674 "drbd: unable to register block device major %d\n",
2679 err = drbd_genl_register();
2681 printk(KERN_ERR "drbd: unable to register generic netlink family\n");
2686 register_reboot_notifier(&drbd_notifier);
2689 * allocate all necessary structs
2693 init_waitqueue_head(&drbd_pp_wait);
2695 drbd_proc = NULL; /* play safe for drbd_cleanup */
2698 err = drbd_create_mempools();
2702 drbd_proc = proc_create_data("drbd", S_IFREG | S_IRUGO , NULL, &drbd_proc_fops, NULL);
2704 printk(KERN_ERR "drbd: unable to register proc file\n");
2708 rwlock_init(&global_state_lock);
2709 INIT_LIST_HEAD(&drbd_tconns);
2711 printk(KERN_INFO "drbd: initialized. "
2712 "Version: " REL_VERSION " (api:%d/proto:%d-%d)\n",
2713 API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX);
2714 printk(KERN_INFO "drbd: %s\n", drbd_buildtag());
2715 printk(KERN_INFO "drbd: registered as block device major %d\n",
2718 return 0; /* Success! */
2723 /* currently always the case */
2724 printk(KERN_ERR "drbd: ran out of memory\n");
2726 printk(KERN_ERR "drbd: initialization failure\n");
2730 void drbd_free_bc(struct drbd_backing_dev *ldev)
2735 blkdev_put(ldev->backing_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
2736 blkdev_put(ldev->md_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
2741 void drbd_free_sock(struct drbd_tconn *tconn)
2743 if (tconn->data.socket) {
2744 mutex_lock(&tconn->data.mutex);
2745 kernel_sock_shutdown(tconn->data.socket, SHUT_RDWR);
2746 sock_release(tconn->data.socket);
2747 tconn->data.socket = NULL;
2748 mutex_unlock(&tconn->data.mutex);
2750 if (tconn->meta.socket) {
2751 mutex_lock(&tconn->meta.mutex);
2752 kernel_sock_shutdown(tconn->meta.socket, SHUT_RDWR);
2753 sock_release(tconn->meta.socket);
2754 tconn->meta.socket = NULL;
2755 mutex_unlock(&tconn->meta.mutex);
2759 /* meta data management */
2761 struct meta_data_on_disk {
2762 u64 la_size; /* last agreed size. */
2763 u64 uuid[UI_SIZE]; /* UUIDs. */
2766 u32 flags; /* MDF */
2769 u32 al_offset; /* offset to this block */
2770 u32 al_nr_extents; /* important for restoring the AL */
2771 /* `-- act_log->nr_elements <-- ldev->dc.al_extents */
2772 u32 bm_offset; /* offset to the bitmap, from here */
2773 u32 bm_bytes_per_bit; /* BM_BLOCK_SIZE */
2774 u32 la_peer_max_bio_size; /* last peer max_bio_size */
2775 u32 reserved_u32[3];
2780 * drbd_md_sync() - Writes the meta data super block if the MD_DIRTY flag bit is set
2781 * @mdev: DRBD device.
2783 void drbd_md_sync(struct drbd_conf *mdev)
2785 struct meta_data_on_disk *buffer;
2789 del_timer(&mdev->md_sync_timer);
2790 /* timer may be rearmed by drbd_md_mark_dirty() now. */
2791 if (!test_and_clear_bit(MD_DIRTY, &mdev->flags))
2794 /* We use here D_FAILED and not D_ATTACHING because we try to write
2795 * metadata even if we detach due to a disk failure! */
2796 if (!get_ldev_if_state(mdev, D_FAILED))
2799 mutex_lock(&mdev->md_io_mutex);
2800 buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);
2801 memset(buffer, 0, 512);
2803 buffer->la_size = cpu_to_be64(drbd_get_capacity(mdev->this_bdev));
2804 for (i = UI_CURRENT; i < UI_SIZE; i++)
2805 buffer->uuid[i] = cpu_to_be64(mdev->ldev->md.uuid[i]);
2806 buffer->flags = cpu_to_be32(mdev->ldev->md.flags);
2807 buffer->magic = cpu_to_be32(DRBD_MD_MAGIC);
2809 buffer->md_size_sect = cpu_to_be32(mdev->ldev->md.md_size_sect);
2810 buffer->al_offset = cpu_to_be32(mdev->ldev->md.al_offset);
2811 buffer->al_nr_extents = cpu_to_be32(mdev->act_log->nr_elements);
2812 buffer->bm_bytes_per_bit = cpu_to_be32(BM_BLOCK_SIZE);
2813 buffer->device_uuid = cpu_to_be64(mdev->ldev->md.device_uuid);
2815 buffer->bm_offset = cpu_to_be32(mdev->ldev->md.bm_offset);
2816 buffer->la_peer_max_bio_size = cpu_to_be32(mdev->peer_max_bio_size);
2818 D_ASSERT(drbd_md_ss__(mdev, mdev->ldev) == mdev->ldev->md.md_offset);
2819 sector = mdev->ldev->md.md_offset;
2821 if (drbd_md_sync_page_io(mdev, mdev->ldev, sector, WRITE)) {
2822 /* this was a try anyways ... */
2823 dev_err(DEV, "meta data update failed!\n");
2824 drbd_chk_io_error(mdev, 1, true);
2827 /* Update mdev->ldev->md.la_size_sect,
2828 * since we updated it on metadata. */
2829 mdev->ldev->md.la_size_sect = drbd_get_capacity(mdev->this_bdev);
2831 mutex_unlock(&mdev->md_io_mutex);
2836 * drbd_md_read() - Reads in the meta data super block
2837 * @mdev: DRBD device.
2838 * @bdev: Device from which the meta data should be read in.
2840 * Return 0 (NO_ERROR) on success, and an enum drbd_ret_code in case
2841 * something goes wrong. Currently only: ERR_IO_MD_DISK, ERR_MD_INVALID.
2843 int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
2845 struct meta_data_on_disk *buffer;
2846 int i, rv = NO_ERROR;
2848 if (!get_ldev_if_state(mdev, D_ATTACHING))
2849 return ERR_IO_MD_DISK;
2851 mutex_lock(&mdev->md_io_mutex);
2852 buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);
2854 if (drbd_md_sync_page_io(mdev, bdev, bdev->md.md_offset, READ)) {
2855 /* NOTE: can't do normal error processing here as this is
2856 called BEFORE disk is attached */
2857 dev_err(DEV, "Error while reading metadata.\n");
2858 rv = ERR_IO_MD_DISK;
2862 if (buffer->magic != cpu_to_be32(DRBD_MD_MAGIC)) {
2863 dev_err(DEV, "Error while reading metadata, magic not found.\n");
2864 rv = ERR_MD_INVALID;
2867 if (be32_to_cpu(buffer->al_offset) != bdev->md.al_offset) {
2868 dev_err(DEV, "unexpected al_offset: %d (expected %d)\n",
2869 be32_to_cpu(buffer->al_offset), bdev->md.al_offset);
2870 rv = ERR_MD_INVALID;
2873 if (be32_to_cpu(buffer->bm_offset) != bdev->md.bm_offset) {
2874 dev_err(DEV, "unexpected bm_offset: %d (expected %d)\n",
2875 be32_to_cpu(buffer->bm_offset), bdev->md.bm_offset);
2876 rv = ERR_MD_INVALID;
2879 if (be32_to_cpu(buffer->md_size_sect) != bdev->md.md_size_sect) {
2880 dev_err(DEV, "unexpected md_size: %u (expected %u)\n",
2881 be32_to_cpu(buffer->md_size_sect), bdev->md.md_size_sect);
2882 rv = ERR_MD_INVALID;
2886 if (be32_to_cpu(buffer->bm_bytes_per_bit) != BM_BLOCK_SIZE) {
2887 dev_err(DEV, "unexpected bm_bytes_per_bit: %u (expected %u)\n",
2888 be32_to_cpu(buffer->bm_bytes_per_bit), BM_BLOCK_SIZE);
2889 rv = ERR_MD_INVALID;
2893 bdev->md.la_size_sect = be64_to_cpu(buffer->la_size);
2894 for (i = UI_CURRENT; i < UI_SIZE; i++)
2895 bdev->md.uuid[i] = be64_to_cpu(buffer->uuid[i]);
2896 bdev->md.flags = be32_to_cpu(buffer->flags);
2897 bdev->md.device_uuid = be64_to_cpu(buffer->device_uuid);
2899 spin_lock_irq(&mdev->tconn->req_lock);
2900 if (mdev->state.conn < C_CONNECTED) {
2902 peer = be32_to_cpu(buffer->la_peer_max_bio_size);
2903 peer = max_t(int, peer, DRBD_MAX_BIO_SIZE_SAFE);
2904 mdev->peer_max_bio_size = peer;
2906 spin_unlock_irq(&mdev->tconn->req_lock);
2908 mutex_lock(&mdev->tconn->conf_update);
2909 /* This blocks wants to be get removed... */
2910 bdev->disk_conf->al_extents = be32_to_cpu(buffer->al_nr_extents);
2911 if (bdev->disk_conf->al_extents < DRBD_AL_EXTENTS_MIN)
2912 bdev->disk_conf->al_extents = DRBD_AL_EXTENTS_DEF;
2913 mutex_unlock(&mdev->tconn->conf_update);
2916 mutex_unlock(&mdev->md_io_mutex);
2923 * drbd_md_mark_dirty() - Mark meta data super block as dirty
2924 * @mdev: DRBD device.
2926 * Call this function if you change anything that should be written to
2927 * the meta-data super block. This function sets MD_DIRTY, and starts a
2928 * timer that ensures that within five seconds you have to call drbd_md_sync().
2931 void drbd_md_mark_dirty_(struct drbd_conf *mdev, unsigned int line, const char *func)
2933 if (!test_and_set_bit(MD_DIRTY, &mdev->flags)) {
2934 mod_timer(&mdev->md_sync_timer, jiffies + HZ);
2935 mdev->last_md_mark_dirty.line = line;
2936 mdev->last_md_mark_dirty.func = func;
2940 void drbd_md_mark_dirty(struct drbd_conf *mdev)
2942 if (!test_and_set_bit(MD_DIRTY, &mdev->flags))
2943 mod_timer(&mdev->md_sync_timer, jiffies + 5*HZ);
2947 static void drbd_uuid_move_history(struct drbd_conf *mdev) __must_hold(local)
2951 for (i = UI_HISTORY_START; i < UI_HISTORY_END; i++)
2952 mdev->ldev->md.uuid[i+1] = mdev->ldev->md.uuid[i];
2955 void _drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local)
2957 if (idx == UI_CURRENT) {
2958 if (mdev->state.role == R_PRIMARY)
2963 drbd_set_ed_uuid(mdev, val);
2966 mdev->ldev->md.uuid[idx] = val;
2967 drbd_md_mark_dirty(mdev);
2971 void drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local)
2973 if (mdev->ldev->md.uuid[idx]) {
2974 drbd_uuid_move_history(mdev);
2975 mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[idx];
2977 _drbd_uuid_set(mdev, idx, val);
2981 * drbd_uuid_new_current() - Creates a new current UUID
2982 * @mdev: DRBD device.
2984 * Creates a new current UUID, and rotates the old current UUID into
2985 * the bitmap slot. Causes an incremental resync upon next connect.
2987 void drbd_uuid_new_current(struct drbd_conf *mdev) __must_hold(local)
2990 unsigned long long bm_uuid = mdev->ldev->md.uuid[UI_BITMAP];
2993 dev_warn(DEV, "bm UUID was already set: %llX\n", bm_uuid);
2995 mdev->ldev->md.uuid[UI_BITMAP] = mdev->ldev->md.uuid[UI_CURRENT];
2997 get_random_bytes(&val, sizeof(u64));
2998 _drbd_uuid_set(mdev, UI_CURRENT, val);
2999 drbd_print_uuids(mdev, "new current UUID");
3000 /* get it to stable storage _now_ */
3004 void drbd_uuid_set_bm(struct drbd_conf *mdev, u64 val) __must_hold(local)
3006 if (mdev->ldev->md.uuid[UI_BITMAP] == 0 && val == 0)
3010 drbd_uuid_move_history(mdev);
3011 mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[UI_BITMAP];
3012 mdev->ldev->md.uuid[UI_BITMAP] = 0;
3014 unsigned long long bm_uuid = mdev->ldev->md.uuid[UI_BITMAP];
3016 dev_warn(DEV, "bm UUID was already set: %llX\n", bm_uuid);
3018 mdev->ldev->md.uuid[UI_BITMAP] = val & ~((u64)1);
3020 drbd_md_mark_dirty(mdev);
3024 * drbd_bmio_set_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
3025 * @mdev: DRBD device.
3027 * Sets all bits in the bitmap and writes the whole bitmap to stable storage.
3029 int drbd_bmio_set_n_write(struct drbd_conf *mdev)
3033 if (get_ldev_if_state(mdev, D_ATTACHING)) {
3034 drbd_md_set_flag(mdev, MDF_FULL_SYNC);
3036 drbd_bm_set_all(mdev);
3038 rv = drbd_bm_write(mdev);
3041 drbd_md_clear_flag(mdev, MDF_FULL_SYNC);
3052 * drbd_bmio_clear_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io()
3053 * @mdev: DRBD device.
3055 * Clears all bits in the bitmap and writes the whole bitmap to stable storage.
3057 int drbd_bmio_clear_n_write(struct drbd_conf *mdev)
3061 drbd_resume_al(mdev);
3062 if (get_ldev_if_state(mdev, D_ATTACHING)) {
3063 drbd_bm_clear_all(mdev);
3064 rv = drbd_bm_write(mdev);
3071 static int w_bitmap_io(struct drbd_work *w, int unused)
3073 struct bm_io_work *work = container_of(w, struct bm_io_work, w);
3074 struct drbd_conf *mdev = w->mdev;
3077 D_ASSERT(atomic_read(&mdev->ap_bio_cnt) == 0);
3079 if (get_ldev(mdev)) {
3080 drbd_bm_lock(mdev, work->why, work->flags);
3081 rv = work->io_fn(mdev);
3082 drbd_bm_unlock(mdev);
3086 clear_bit_unlock(BITMAP_IO, &mdev->flags);
3087 wake_up(&mdev->misc_wait);
3090 work->done(mdev, rv);
3092 clear_bit(BITMAP_IO_QUEUED, &mdev->flags);
3099 void drbd_ldev_destroy(struct drbd_conf *mdev)
3101 lc_destroy(mdev->resync);
3102 mdev->resync = NULL;
3103 lc_destroy(mdev->act_log);
3104 mdev->act_log = NULL;
3106 drbd_free_bc(mdev->ldev);
3107 mdev->ldev = NULL;);
3109 clear_bit(GO_DISKLESS, &mdev->flags);
3112 static int w_go_diskless(struct drbd_work *w, int unused)
3114 struct drbd_conf *mdev = w->mdev;
3116 D_ASSERT(mdev->state.disk == D_FAILED);
3117 /* we cannot assert local_cnt == 0 here, as get_ldev_if_state will
3118 * inc/dec it frequently. Once we are D_DISKLESS, no one will touch
3119 * the protected members anymore, though, so once put_ldev reaches zero
3120 * again, it will be safe to free them. */
3121 drbd_force_state(mdev, NS(disk, D_DISKLESS));
3125 void drbd_go_diskless(struct drbd_conf *mdev)
3127 D_ASSERT(mdev->state.disk == D_FAILED);
3128 if (!test_and_set_bit(GO_DISKLESS, &mdev->flags))
3129 drbd_queue_work(&mdev->tconn->data.work, &mdev->go_diskless);
3133 * drbd_queue_bitmap_io() - Queues an IO operation on the whole bitmap
3134 * @mdev: DRBD device.
3135 * @io_fn: IO callback to be called when bitmap IO is possible
3136 * @done: callback to be called after the bitmap IO was performed
3137 * @why: Descriptive text of the reason for doing the IO
3139 * While IO on the bitmap happens we freeze application IO thus we ensure
3140 * that drbd_set_out_of_sync() can not be called. This function MAY ONLY be
3141 * called from worker context. It MUST NOT be used while a previous such
3142 * work is still pending!
3144 void drbd_queue_bitmap_io(struct drbd_conf *mdev,
3145 int (*io_fn)(struct drbd_conf *),
3146 void (*done)(struct drbd_conf *, int),
3147 char *why, enum bm_flag flags)
3149 D_ASSERT(current == mdev->tconn->worker.task);
3151 D_ASSERT(!test_bit(BITMAP_IO_QUEUED, &mdev->flags));
3152 D_ASSERT(!test_bit(BITMAP_IO, &mdev->flags));
3153 D_ASSERT(list_empty(&mdev->bm_io_work.w.list));
3154 if (mdev->bm_io_work.why)
3155 dev_err(DEV, "FIXME going to queue '%s' but '%s' still pending?\n",
3156 why, mdev->bm_io_work.why);
3158 mdev->bm_io_work.io_fn = io_fn;
3159 mdev->bm_io_work.done = done;
3160 mdev->bm_io_work.why = why;
3161 mdev->bm_io_work.flags = flags;
3163 spin_lock_irq(&mdev->tconn->req_lock);
3164 set_bit(BITMAP_IO, &mdev->flags);
3165 if (atomic_read(&mdev->ap_bio_cnt) == 0) {
3166 if (!test_and_set_bit(BITMAP_IO_QUEUED, &mdev->flags))
3167 drbd_queue_work(&mdev->tconn->data.work, &mdev->bm_io_work.w);
3169 spin_unlock_irq(&mdev->tconn->req_lock);
3173 * drbd_bitmap_io() - Does an IO operation on the whole bitmap
3174 * @mdev: DRBD device.
3175 * @io_fn: IO callback to be called when bitmap IO is possible
3176 * @why: Descriptive text of the reason for doing the IO
3178 * freezes application IO while that the actual IO operations runs. This
3179 * functions MAY NOT be called from worker context.
3181 int drbd_bitmap_io(struct drbd_conf *mdev, int (*io_fn)(struct drbd_conf *),
3182 char *why, enum bm_flag flags)
3186 D_ASSERT(current != mdev->tconn->worker.task);
3188 if ((flags & BM_LOCKED_SET_ALLOWED) == 0)
3189 drbd_suspend_io(mdev);
3191 drbd_bm_lock(mdev, why, flags);
3193 drbd_bm_unlock(mdev);
3195 if ((flags & BM_LOCKED_SET_ALLOWED) == 0)
3196 drbd_resume_io(mdev);
3201 void drbd_md_set_flag(struct drbd_conf *mdev, int flag) __must_hold(local)
3203 if ((mdev->ldev->md.flags & flag) != flag) {
3204 drbd_md_mark_dirty(mdev);
3205 mdev->ldev->md.flags |= flag;
3209 void drbd_md_clear_flag(struct drbd_conf *mdev, int flag) __must_hold(local)
3211 if ((mdev->ldev->md.flags & flag) != 0) {
3212 drbd_md_mark_dirty(mdev);
3213 mdev->ldev->md.flags &= ~flag;
3216 int drbd_md_test_flag(struct drbd_backing_dev *bdev, int flag)
3218 return (bdev->md.flags & flag) != 0;
3221 static void md_sync_timer_fn(unsigned long data)
3223 struct drbd_conf *mdev = (struct drbd_conf *) data;
3225 drbd_queue_work_front(&mdev->tconn->data.work, &mdev->md_sync_work);
3228 static int w_md_sync(struct drbd_work *w, int unused)
3230 struct drbd_conf *mdev = w->mdev;
3232 dev_warn(DEV, "md_sync_timer expired! Worker calls drbd_md_sync().\n");
3234 dev_warn(DEV, "last md_mark_dirty: %s:%u\n",
3235 mdev->last_md_mark_dirty.func, mdev->last_md_mark_dirty.line);
3241 const char *cmdname(enum drbd_packet cmd)
3243 /* THINK may need to become several global tables
3244 * when we want to support more than
3245 * one PRO_VERSION */
3246 static const char *cmdnames[] = {
3248 [P_DATA_REPLY] = "DataReply",
3249 [P_RS_DATA_REPLY] = "RSDataReply",
3250 [P_BARRIER] = "Barrier",
3251 [P_BITMAP] = "ReportBitMap",
3252 [P_BECOME_SYNC_TARGET] = "BecomeSyncTarget",
3253 [P_BECOME_SYNC_SOURCE] = "BecomeSyncSource",
3254 [P_UNPLUG_REMOTE] = "UnplugRemote",
3255 [P_DATA_REQUEST] = "DataRequest",
3256 [P_RS_DATA_REQUEST] = "RSDataRequest",
3257 [P_SYNC_PARAM] = "SyncParam",
3258 [P_SYNC_PARAM89] = "SyncParam89",
3259 [P_PROTOCOL] = "ReportProtocol",
3260 [P_UUIDS] = "ReportUUIDs",
3261 [P_SIZES] = "ReportSizes",
3262 [P_STATE] = "ReportState",
3263 [P_SYNC_UUID] = "ReportSyncUUID",
3264 [P_AUTH_CHALLENGE] = "AuthChallenge",
3265 [P_AUTH_RESPONSE] = "AuthResponse",
3267 [P_PING_ACK] = "PingAck",
3268 [P_RECV_ACK] = "RecvAck",
3269 [P_WRITE_ACK] = "WriteAck",
3270 [P_RS_WRITE_ACK] = "RSWriteAck",
3271 [P_DISCARD_WRITE] = "DiscardWrite",
3272 [P_NEG_ACK] = "NegAck",
3273 [P_NEG_DREPLY] = "NegDReply",
3274 [P_NEG_RS_DREPLY] = "NegRSDReply",
3275 [P_BARRIER_ACK] = "BarrierAck",
3276 [P_STATE_CHG_REQ] = "StateChgRequest",
3277 [P_STATE_CHG_REPLY] = "StateChgReply",
3278 [P_OV_REQUEST] = "OVRequest",
3279 [P_OV_REPLY] = "OVReply",
3280 [P_OV_RESULT] = "OVResult",
3281 [P_CSUM_RS_REQUEST] = "CsumRSRequest",
3282 [P_RS_IS_IN_SYNC] = "CsumRSIsInSync",
3283 [P_COMPRESSED_BITMAP] = "CBitmap",
3284 [P_DELAY_PROBE] = "DelayProbe",
3285 [P_OUT_OF_SYNC] = "OutOfSync",
3286 [P_RETRY_WRITE] = "RetryWrite",
3287 [P_RS_CANCEL] = "RSCancel",
3288 [P_CONN_ST_CHG_REQ] = "conn_st_chg_req",
3289 [P_CONN_ST_CHG_REPLY] = "conn_st_chg_reply",
3291 /* enum drbd_packet, but not commands - obsoleted flags:
3297 /* too big for the array: 0xfffX */
3298 if (cmd == P_INITIAL_META)
3299 return "InitialMeta";
3300 if (cmd == P_INITIAL_DATA)
3301 return "InitialData";
3302 if (cmd == P_CONNECTION_FEATURES)
3303 return "ConnectionFeatures";
3304 if (cmd >= ARRAY_SIZE(cmdnames))
3306 return cmdnames[cmd];
3310 * drbd_wait_misc - wait for a request to make progress
3311 * @mdev: device associated with the request
3312 * @i: the struct drbd_interval embedded in struct drbd_request or
3313 * struct drbd_peer_request
3315 int drbd_wait_misc(struct drbd_conf *mdev, struct drbd_interval *i)
3317 struct net_conf *nc;
3322 nc = rcu_dereference(mdev->tconn->net_conf);
3327 timeout = nc->ko_count ? nc->timeout * HZ / 10 * nc->ko_count : MAX_SCHEDULE_TIMEOUT;
3330 /* Indicate to wake up mdev->misc_wait on progress. */
3332 prepare_to_wait(&mdev->misc_wait, &wait, TASK_INTERRUPTIBLE);
3333 spin_unlock_irq(&mdev->tconn->req_lock);
3334 timeout = schedule_timeout(timeout);
3335 finish_wait(&mdev->misc_wait, &wait);
3336 spin_lock_irq(&mdev->tconn->req_lock);
3337 if (!timeout || mdev->state.conn < C_CONNECTED)
3339 if (signal_pending(current))
3340 return -ERESTARTSYS;
3344 #ifdef CONFIG_DRBD_FAULT_INJECTION
3345 /* Fault insertion support including random number generator shamelessly
3346 * stolen from kernel/rcutorture.c */
3347 struct fault_random_state {
3348 unsigned long state;
3349 unsigned long count;
3352 #define FAULT_RANDOM_MULT 39916801 /* prime */
3353 #define FAULT_RANDOM_ADD 479001701 /* prime */
3354 #define FAULT_RANDOM_REFRESH 10000
3357 * Crude but fast random-number generator. Uses a linear congruential
3358 * generator, with occasional help from get_random_bytes().
3360 static unsigned long
3361 _drbd_fault_random(struct fault_random_state *rsp)
3365 if (!rsp->count--) {
3366 get_random_bytes(&refresh, sizeof(refresh));
3367 rsp->state += refresh;
3368 rsp->count = FAULT_RANDOM_REFRESH;
3370 rsp->state = rsp->state * FAULT_RANDOM_MULT + FAULT_RANDOM_ADD;
3371 return swahw32(rsp->state);
3375 _drbd_fault_str(unsigned int type) {
3376 static char *_faults[] = {
3377 [DRBD_FAULT_MD_WR] = "Meta-data write",
3378 [DRBD_FAULT_MD_RD] = "Meta-data read",
3379 [DRBD_FAULT_RS_WR] = "Resync write",
3380 [DRBD_FAULT_RS_RD] = "Resync read",
3381 [DRBD_FAULT_DT_WR] = "Data write",
3382 [DRBD_FAULT_DT_RD] = "Data read",
3383 [DRBD_FAULT_DT_RA] = "Data read ahead",
3384 [DRBD_FAULT_BM_ALLOC] = "BM allocation",
3385 [DRBD_FAULT_AL_EE] = "EE allocation",
3386 [DRBD_FAULT_RECEIVE] = "receive data corruption",
3389 return (type < DRBD_FAULT_MAX) ? _faults[type] : "**Unknown**";
3393 _drbd_insert_fault(struct drbd_conf *mdev, unsigned int type)
3395 static struct fault_random_state rrs = {0, 0};
3397 unsigned int ret = (
3399 ((1 << mdev_to_minor(mdev)) & fault_devs) != 0) &&
3400 (((_drbd_fault_random(&rrs) % 100) + 1) <= fault_rate));
3405 if (__ratelimit(&drbd_ratelimit_state))
3406 dev_warn(DEV, "***Simulating %s failure\n",
3407 _drbd_fault_str(type));
3414 const char *drbd_buildtag(void)
3416 /* DRBD built from external sources has here a reference to the
3417 git hash of the source code. */
3419 static char buildtag[38] = "\0uilt-in";
3421 if (buildtag[0] == 0) {
3422 #ifdef CONFIG_MODULES
3423 if (THIS_MODULE != NULL)
3424 sprintf(buildtag, "srcversion: %-24s", THIS_MODULE->srcversion);
3433 module_init(drbd_init)
3434 module_exit(drbd_cleanup)
3436 EXPORT_SYMBOL(drbd_conn_str);
3437 EXPORT_SYMBOL(drbd_role_str);
3438 EXPORT_SYMBOL(drbd_disk_str);
3439 EXPORT_SYMBOL(drbd_set_st_err_str);