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16
17#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18
19#include <linux/module.h>
20#include <linux/jiffies.h>
21#include <linux/drbd.h>
22#include <linux/uaccess.h>
23#include <asm/types.h>
24#include <net/sock.h>
25#include <linux/ctype.h>
26#include <linux/mutex.h>
27#include <linux/fs.h>
28#include <linux/file.h>
29#include <linux/proc_fs.h>
30#include <linux/init.h>
31#include <linux/mm.h>
32#include <linux/memcontrol.h>
33#include <linux/mm_inline.h>
34#include <linux/slab.h>
35#include <linux/random.h>
36#include <linux/reboot.h>
37#include <linux/notifier.h>
38#include <linux/kthread.h>
39#include <linux/workqueue.h>
40#define __KERNEL_SYSCALLS__
41#include <linux/unistd.h>
42#include <linux/vmalloc.h>
43#include <linux/sched/signal.h>
44
45#include <linux/drbd_limits.h>
46#include "drbd_int.h"
47#include "drbd_protocol.h"
48#include "drbd_req.h"
49#include "drbd_vli.h"
50#include "drbd_debugfs.h"
51
52static DEFINE_MUTEX(drbd_main_mutex);
53static int drbd_open(struct block_device *bdev, fmode_t mode);
54static void drbd_release(struct gendisk *gd, fmode_t mode);
55static void md_sync_timer_fn(struct timer_list *t);
56static int w_bitmap_io(struct drbd_work *w, int unused);
57
58MODULE_AUTHOR("Philipp Reisner <phil@linbit.com>, "
59 "Lars Ellenberg <lars@linbit.com>");
60MODULE_DESCRIPTION("drbd - Distributed Replicated Block Device v" REL_VERSION);
61MODULE_VERSION(REL_VERSION);
62MODULE_LICENSE("GPL");
63MODULE_PARM_DESC(minor_count, "Approximate number of drbd devices ("
64 __stringify(DRBD_MINOR_COUNT_MIN) "-" __stringify(DRBD_MINOR_COUNT_MAX) ")");
65MODULE_ALIAS_BLOCKDEV_MAJOR(DRBD_MAJOR);
66
67#include <linux/moduleparam.h>
68
69
70
71#ifdef CONFIG_DRBD_FAULT_INJECTION
72int drbd_enable_faults;
73int drbd_fault_rate;
74static int drbd_fault_count;
75static int drbd_fault_devs;
76
77module_param_named(enable_faults, drbd_enable_faults, int, 0664);
78
79module_param_named(fault_rate, drbd_fault_rate, int, 0664);
80
81module_param_named(fault_count, drbd_fault_count, int, 0664);
82
83module_param_named(fault_devs, drbd_fault_devs, int, 0644);
84#endif
85
86
87static bool drbd_allow_oos;
88static bool drbd_disable_sendpage;
89MODULE_PARM_DESC(allow_oos, "DONT USE!");
90module_param_named(allow_oos, drbd_allow_oos, bool, 0);
91module_param_named(disable_sendpage, drbd_disable_sendpage, bool, 0644);
92
93
94int drbd_proc_details;
95module_param_named(proc_details, drbd_proc_details, int, 0644);
96
97unsigned int drbd_minor_count = DRBD_MINOR_COUNT_DEF;
98
99
100char drbd_usermode_helper[80] = "/sbin/drbdadm";
101module_param_named(minor_count, drbd_minor_count, uint, 0444);
102module_param_string(usermode_helper, drbd_usermode_helper, sizeof(drbd_usermode_helper), 0644);
103
104
105
106
107struct idr drbd_devices;
108struct list_head drbd_resources;
109struct mutex resources_mutex;
110
111struct kmem_cache *drbd_request_cache;
112struct kmem_cache *drbd_ee_cache;
113struct kmem_cache *drbd_bm_ext_cache;
114struct kmem_cache *drbd_al_ext_cache;
115mempool_t drbd_request_mempool;
116mempool_t drbd_ee_mempool;
117mempool_t drbd_md_io_page_pool;
118struct bio_set drbd_md_io_bio_set;
119struct bio_set drbd_io_bio_set;
120
121
122
123
124
125
126
127struct page *drbd_pp_pool;
128DEFINE_SPINLOCK(drbd_pp_lock);
129int drbd_pp_vacant;
130wait_queue_head_t drbd_pp_wait;
131
132DEFINE_RATELIMIT_STATE(drbd_ratelimit_state, 5 * HZ, 5);
133
134static const struct block_device_operations drbd_ops = {
135 .owner = THIS_MODULE,
136 .submit_bio = drbd_submit_bio,
137 .open = drbd_open,
138 .release = drbd_release,
139};
140
141#ifdef __CHECKER__
142
143
144
145int _get_ldev_if_state(struct drbd_device *device, enum drbd_disk_state mins)
146{
147 int io_allowed;
148
149 atomic_inc(&device->local_cnt);
150 io_allowed = (device->state.disk >= mins);
151 if (!io_allowed) {
152 if (atomic_dec_and_test(&device->local_cnt))
153 wake_up(&device->misc_wait);
154 }
155 return io_allowed;
156}
157
158#endif
159
160
161
162
163
164
165
166
167
168
169
170void tl_release(struct drbd_connection *connection, unsigned int barrier_nr,
171 unsigned int set_size)
172{
173 struct drbd_request *r;
174 struct drbd_request *req = NULL;
175 int expect_epoch = 0;
176 int expect_size = 0;
177
178 spin_lock_irq(&connection->resource->req_lock);
179
180
181
182 list_for_each_entry(r, &connection->transfer_log, tl_requests) {
183 const unsigned s = r->rq_state;
184 if (!req) {
185 if (!(s & RQ_WRITE))
186 continue;
187 if (!(s & RQ_NET_MASK))
188 continue;
189 if (s & RQ_NET_DONE)
190 continue;
191 req = r;
192 expect_epoch = req->epoch;
193 expect_size ++;
194 } else {
195 if (r->epoch != expect_epoch)
196 break;
197 if (!(s & RQ_WRITE))
198 continue;
199
200
201 expect_size++;
202 }
203 }
204
205
206 if (req == NULL) {
207 drbd_err(connection, "BAD! BarrierAck #%u received, but no epoch in tl!?\n",
208 barrier_nr);
209 goto bail;
210 }
211 if (expect_epoch != barrier_nr) {
212 drbd_err(connection, "BAD! BarrierAck #%u received, expected #%u!\n",
213 barrier_nr, expect_epoch);
214 goto bail;
215 }
216
217 if (expect_size != set_size) {
218 drbd_err(connection, "BAD! BarrierAck #%u received with n_writes=%u, expected n_writes=%u!\n",
219 barrier_nr, set_size, expect_size);
220 goto bail;
221 }
222
223
224
225
226
227 list_for_each_entry(req, &connection->transfer_log, tl_requests)
228 if (req->epoch == expect_epoch)
229 break;
230 list_for_each_entry_safe_from(req, r, &connection->transfer_log, tl_requests) {
231 if (req->epoch != expect_epoch)
232 break;
233 _req_mod(req, BARRIER_ACKED);
234 }
235 spin_unlock_irq(&connection->resource->req_lock);
236
237 return;
238
239bail:
240 spin_unlock_irq(&connection->resource->req_lock);
241 conn_request_state(connection, NS(conn, C_PROTOCOL_ERROR), CS_HARD);
242}
243
244
245
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249
250
251
252
253
254void _tl_restart(struct drbd_connection *connection, enum drbd_req_event what)
255{
256 struct drbd_request *req, *r;
257
258 list_for_each_entry_safe(req, r, &connection->transfer_log, tl_requests)
259 _req_mod(req, what);
260}
261
262void tl_restart(struct drbd_connection *connection, enum drbd_req_event what)
263{
264 spin_lock_irq(&connection->resource->req_lock);
265 _tl_restart(connection, what);
266 spin_unlock_irq(&connection->resource->req_lock);
267}
268
269
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271
272
273
274
275
276
277void tl_clear(struct drbd_connection *connection)
278{
279 tl_restart(connection, CONNECTION_LOST_WHILE_PENDING);
280}
281
282
283
284
285
286void tl_abort_disk_io(struct drbd_device *device)
287{
288 struct drbd_connection *connection = first_peer_device(device)->connection;
289 struct drbd_request *req, *r;
290
291 spin_lock_irq(&connection->resource->req_lock);
292 list_for_each_entry_safe(req, r, &connection->transfer_log, tl_requests) {
293 if (!(req->rq_state & RQ_LOCAL_PENDING))
294 continue;
295 if (req->device != device)
296 continue;
297 _req_mod(req, ABORT_DISK_IO);
298 }
299 spin_unlock_irq(&connection->resource->req_lock);
300}
301
302static int drbd_thread_setup(void *arg)
303{
304 struct drbd_thread *thi = (struct drbd_thread *) arg;
305 struct drbd_resource *resource = thi->resource;
306 unsigned long flags;
307 int retval;
308
309 snprintf(current->comm, sizeof(current->comm), "drbd_%c_%s",
310 thi->name[0],
311 resource->name);
312
313 allow_kernel_signal(DRBD_SIGKILL);
314 allow_kernel_signal(SIGXCPU);
315restart:
316 retval = thi->function(thi);
317
318 spin_lock_irqsave(&thi->t_lock, flags);
319
320
321
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325
326
327
328
329
330 if (thi->t_state == RESTARTING) {
331 drbd_info(resource, "Restarting %s thread\n", thi->name);
332 thi->t_state = RUNNING;
333 spin_unlock_irqrestore(&thi->t_lock, flags);
334 goto restart;
335 }
336
337 thi->task = NULL;
338 thi->t_state = NONE;
339 smp_mb();
340 complete_all(&thi->stop);
341 spin_unlock_irqrestore(&thi->t_lock, flags);
342
343 drbd_info(resource, "Terminating %s\n", current->comm);
344
345
346
347 if (thi->connection)
348 kref_put(&thi->connection->kref, drbd_destroy_connection);
349 kref_put(&resource->kref, drbd_destroy_resource);
350 module_put(THIS_MODULE);
351 return retval;
352}
353
354static void drbd_thread_init(struct drbd_resource *resource, struct drbd_thread *thi,
355 int (*func) (struct drbd_thread *), const char *name)
356{
357 spin_lock_init(&thi->t_lock);
358 thi->task = NULL;
359 thi->t_state = NONE;
360 thi->function = func;
361 thi->resource = resource;
362 thi->connection = NULL;
363 thi->name = name;
364}
365
366int drbd_thread_start(struct drbd_thread *thi)
367{
368 struct drbd_resource *resource = thi->resource;
369 struct task_struct *nt;
370 unsigned long flags;
371
372
373
374 spin_lock_irqsave(&thi->t_lock, flags);
375
376 switch (thi->t_state) {
377 case NONE:
378 drbd_info(resource, "Starting %s thread (from %s [%d])\n",
379 thi->name, current->comm, current->pid);
380
381
382 if (!try_module_get(THIS_MODULE)) {
383 drbd_err(resource, "Failed to get module reference in drbd_thread_start\n");
384 spin_unlock_irqrestore(&thi->t_lock, flags);
385 return false;
386 }
387
388 kref_get(&resource->kref);
389 if (thi->connection)
390 kref_get(&thi->connection->kref);
391
392 init_completion(&thi->stop);
393 thi->reset_cpu_mask = 1;
394 thi->t_state = RUNNING;
395 spin_unlock_irqrestore(&thi->t_lock, flags);
396 flush_signals(current);
397
398 nt = kthread_create(drbd_thread_setup, (void *) thi,
399 "drbd_%c_%s", thi->name[0], thi->resource->name);
400
401 if (IS_ERR(nt)) {
402 drbd_err(resource, "Couldn't start thread\n");
403
404 if (thi->connection)
405 kref_put(&thi->connection->kref, drbd_destroy_connection);
406 kref_put(&resource->kref, drbd_destroy_resource);
407 module_put(THIS_MODULE);
408 return false;
409 }
410 spin_lock_irqsave(&thi->t_lock, flags);
411 thi->task = nt;
412 thi->t_state = RUNNING;
413 spin_unlock_irqrestore(&thi->t_lock, flags);
414 wake_up_process(nt);
415 break;
416 case EXITING:
417 thi->t_state = RESTARTING;
418 drbd_info(resource, "Restarting %s thread (from %s [%d])\n",
419 thi->name, current->comm, current->pid);
420 fallthrough;
421 case RUNNING:
422 case RESTARTING:
423 default:
424 spin_unlock_irqrestore(&thi->t_lock, flags);
425 break;
426 }
427
428 return true;
429}
430
431
432void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait)
433{
434 unsigned long flags;
435
436 enum drbd_thread_state ns = restart ? RESTARTING : EXITING;
437
438
439 spin_lock_irqsave(&thi->t_lock, flags);
440
441 if (thi->t_state == NONE) {
442 spin_unlock_irqrestore(&thi->t_lock, flags);
443 if (restart)
444 drbd_thread_start(thi);
445 return;
446 }
447
448 if (thi->t_state != ns) {
449 if (thi->task == NULL) {
450 spin_unlock_irqrestore(&thi->t_lock, flags);
451 return;
452 }
453
454 thi->t_state = ns;
455 smp_mb();
456 init_completion(&thi->stop);
457 if (thi->task != current)
458 send_sig(DRBD_SIGKILL, thi->task, 1);
459 }
460
461 spin_unlock_irqrestore(&thi->t_lock, flags);
462
463 if (wait)
464 wait_for_completion(&thi->stop);
465}
466
467int conn_lowest_minor(struct drbd_connection *connection)
468{
469 struct drbd_peer_device *peer_device;
470 int vnr = 0, minor = -1;
471
472 rcu_read_lock();
473 peer_device = idr_get_next(&connection->peer_devices, &vnr);
474 if (peer_device)
475 minor = device_to_minor(peer_device->device);
476 rcu_read_unlock();
477
478 return minor;
479}
480
481#ifdef CONFIG_SMP
482
483
484
485
486
487
488static void drbd_calc_cpu_mask(cpumask_var_t *cpu_mask)
489{
490 unsigned int *resources_per_cpu, min_index = ~0;
491
492 resources_per_cpu = kcalloc(nr_cpu_ids, sizeof(*resources_per_cpu),
493 GFP_KERNEL);
494 if (resources_per_cpu) {
495 struct drbd_resource *resource;
496 unsigned int cpu, min = ~0;
497
498 rcu_read_lock();
499 for_each_resource_rcu(resource, &drbd_resources) {
500 for_each_cpu(cpu, resource->cpu_mask)
501 resources_per_cpu[cpu]++;
502 }
503 rcu_read_unlock();
504 for_each_online_cpu(cpu) {
505 if (resources_per_cpu[cpu] < min) {
506 min = resources_per_cpu[cpu];
507 min_index = cpu;
508 }
509 }
510 kfree(resources_per_cpu);
511 }
512 if (min_index == ~0) {
513 cpumask_setall(*cpu_mask);
514 return;
515 }
516 cpumask_set_cpu(min_index, *cpu_mask);
517}
518
519
520
521
522
523
524
525
526void drbd_thread_current_set_cpu(struct drbd_thread *thi)
527{
528 struct drbd_resource *resource = thi->resource;
529 struct task_struct *p = current;
530
531 if (!thi->reset_cpu_mask)
532 return;
533 thi->reset_cpu_mask = 0;
534 set_cpus_allowed_ptr(p, resource->cpu_mask);
535}
536#else
537#define drbd_calc_cpu_mask(A) ({})
538#endif
539
540
541
542
543
544
545
546
547unsigned int drbd_header_size(struct drbd_connection *connection)
548{
549 if (connection->agreed_pro_version >= 100) {
550 BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header100), 8));
551 return sizeof(struct p_header100);
552 } else {
553 BUILD_BUG_ON(sizeof(struct p_header80) !=
554 sizeof(struct p_header95));
555 BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header80), 8));
556 return sizeof(struct p_header80);
557 }
558}
559
560static unsigned int prepare_header80(struct p_header80 *h, enum drbd_packet cmd, int size)
561{
562 h->magic = cpu_to_be32(DRBD_MAGIC);
563 h->command = cpu_to_be16(cmd);
564 h->length = cpu_to_be16(size);
565 return sizeof(struct p_header80);
566}
567
568static unsigned int prepare_header95(struct p_header95 *h, enum drbd_packet cmd, int size)
569{
570 h->magic = cpu_to_be16(DRBD_MAGIC_BIG);
571 h->command = cpu_to_be16(cmd);
572 h->length = cpu_to_be32(size);
573 return sizeof(struct p_header95);
574}
575
576static unsigned int prepare_header100(struct p_header100 *h, enum drbd_packet cmd,
577 int size, int vnr)
578{
579 h->magic = cpu_to_be32(DRBD_MAGIC_100);
580 h->volume = cpu_to_be16(vnr);
581 h->command = cpu_to_be16(cmd);
582 h->length = cpu_to_be32(size);
583 h->pad = 0;
584 return sizeof(struct p_header100);
585}
586
587static unsigned int prepare_header(struct drbd_connection *connection, int vnr,
588 void *buffer, enum drbd_packet cmd, int size)
589{
590 if (connection->agreed_pro_version >= 100)
591 return prepare_header100(buffer, cmd, size, vnr);
592 else if (connection->agreed_pro_version >= 95 &&
593 size > DRBD_MAX_SIZE_H80_PACKET)
594 return prepare_header95(buffer, cmd, size);
595 else
596 return prepare_header80(buffer, cmd, size);
597}
598
599static void *__conn_prepare_command(struct drbd_connection *connection,
600 struct drbd_socket *sock)
601{
602 if (!sock->socket)
603 return NULL;
604 return sock->sbuf + drbd_header_size(connection);
605}
606
607void *conn_prepare_command(struct drbd_connection *connection, struct drbd_socket *sock)
608{
609 void *p;
610
611 mutex_lock(&sock->mutex);
612 p = __conn_prepare_command(connection, sock);
613 if (!p)
614 mutex_unlock(&sock->mutex);
615
616 return p;
617}
618
619void *drbd_prepare_command(struct drbd_peer_device *peer_device, struct drbd_socket *sock)
620{
621 return conn_prepare_command(peer_device->connection, sock);
622}
623
624static int __send_command(struct drbd_connection *connection, int vnr,
625 struct drbd_socket *sock, enum drbd_packet cmd,
626 unsigned int header_size, void *data,
627 unsigned int size)
628{
629 int msg_flags;
630 int err;
631
632
633
634
635
636
637
638
639 msg_flags = data ? MSG_MORE : 0;
640
641 header_size += prepare_header(connection, vnr, sock->sbuf, cmd,
642 header_size + size);
643 err = drbd_send_all(connection, sock->socket, sock->sbuf, header_size,
644 msg_flags);
645 if (data && !err)
646 err = drbd_send_all(connection, sock->socket, data, size, 0);
647
648
649 if (!err && (cmd == P_PING || cmd == P_PING_ACK))
650 tcp_sock_set_nodelay(sock->socket->sk);
651
652 return err;
653}
654
655static int __conn_send_command(struct drbd_connection *connection, struct drbd_socket *sock,
656 enum drbd_packet cmd, unsigned int header_size,
657 void *data, unsigned int size)
658{
659 return __send_command(connection, 0, sock, cmd, header_size, data, size);
660}
661
662int conn_send_command(struct drbd_connection *connection, struct drbd_socket *sock,
663 enum drbd_packet cmd, unsigned int header_size,
664 void *data, unsigned int size)
665{
666 int err;
667
668 err = __conn_send_command(connection, sock, cmd, header_size, data, size);
669 mutex_unlock(&sock->mutex);
670 return err;
671}
672
673int drbd_send_command(struct drbd_peer_device *peer_device, struct drbd_socket *sock,
674 enum drbd_packet cmd, unsigned int header_size,
675 void *data, unsigned int size)
676{
677 int err;
678
679 err = __send_command(peer_device->connection, peer_device->device->vnr,
680 sock, cmd, header_size, data, size);
681 mutex_unlock(&sock->mutex);
682 return err;
683}
684
685int drbd_send_ping(struct drbd_connection *connection)
686{
687 struct drbd_socket *sock;
688
689 sock = &connection->meta;
690 if (!conn_prepare_command(connection, sock))
691 return -EIO;
692 return conn_send_command(connection, sock, P_PING, 0, NULL, 0);
693}
694
695int drbd_send_ping_ack(struct drbd_connection *connection)
696{
697 struct drbd_socket *sock;
698
699 sock = &connection->meta;
700 if (!conn_prepare_command(connection, sock))
701 return -EIO;
702 return conn_send_command(connection, sock, P_PING_ACK, 0, NULL, 0);
703}
704
705int drbd_send_sync_param(struct drbd_peer_device *peer_device)
706{
707 struct drbd_socket *sock;
708 struct p_rs_param_95 *p;
709 int size;
710 const int apv = peer_device->connection->agreed_pro_version;
711 enum drbd_packet cmd;
712 struct net_conf *nc;
713 struct disk_conf *dc;
714
715 sock = &peer_device->connection->data;
716 p = drbd_prepare_command(peer_device, sock);
717 if (!p)
718 return -EIO;
719
720 rcu_read_lock();
721 nc = rcu_dereference(peer_device->connection->net_conf);
722
723 size = apv <= 87 ? sizeof(struct p_rs_param)
724 : apv == 88 ? sizeof(struct p_rs_param)
725 + strlen(nc->verify_alg) + 1
726 : apv <= 94 ? sizeof(struct p_rs_param_89)
727 : sizeof(struct p_rs_param_95);
728
729 cmd = apv >= 89 ? P_SYNC_PARAM89 : P_SYNC_PARAM;
730
731
732 memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX);
733
734 if (get_ldev(peer_device->device)) {
735 dc = rcu_dereference(peer_device->device->ldev->disk_conf);
736 p->resync_rate = cpu_to_be32(dc->resync_rate);
737 p->c_plan_ahead = cpu_to_be32(dc->c_plan_ahead);
738 p->c_delay_target = cpu_to_be32(dc->c_delay_target);
739 p->c_fill_target = cpu_to_be32(dc->c_fill_target);
740 p->c_max_rate = cpu_to_be32(dc->c_max_rate);
741 put_ldev(peer_device->device);
742 } else {
743 p->resync_rate = cpu_to_be32(DRBD_RESYNC_RATE_DEF);
744 p->c_plan_ahead = cpu_to_be32(DRBD_C_PLAN_AHEAD_DEF);
745 p->c_delay_target = cpu_to_be32(DRBD_C_DELAY_TARGET_DEF);
746 p->c_fill_target = cpu_to_be32(DRBD_C_FILL_TARGET_DEF);
747 p->c_max_rate = cpu_to_be32(DRBD_C_MAX_RATE_DEF);
748 }
749
750 if (apv >= 88)
751 strcpy(p->verify_alg, nc->verify_alg);
752 if (apv >= 89)
753 strcpy(p->csums_alg, nc->csums_alg);
754 rcu_read_unlock();
755
756 return drbd_send_command(peer_device, sock, cmd, size, NULL, 0);
757}
758
759int __drbd_send_protocol(struct drbd_connection *connection, enum drbd_packet cmd)
760{
761 struct drbd_socket *sock;
762 struct p_protocol *p;
763 struct net_conf *nc;
764 int size, cf;
765
766 sock = &connection->data;
767 p = __conn_prepare_command(connection, sock);
768 if (!p)
769 return -EIO;
770
771 rcu_read_lock();
772 nc = rcu_dereference(connection->net_conf);
773
774 if (nc->tentative && connection->agreed_pro_version < 92) {
775 rcu_read_unlock();
776 drbd_err(connection, "--dry-run is not supported by peer");
777 return -EOPNOTSUPP;
778 }
779
780 size = sizeof(*p);
781 if (connection->agreed_pro_version >= 87)
782 size += strlen(nc->integrity_alg) + 1;
783
784 p->protocol = cpu_to_be32(nc->wire_protocol);
785 p->after_sb_0p = cpu_to_be32(nc->after_sb_0p);
786 p->after_sb_1p = cpu_to_be32(nc->after_sb_1p);
787 p->after_sb_2p = cpu_to_be32(nc->after_sb_2p);
788 p->two_primaries = cpu_to_be32(nc->two_primaries);
789 cf = 0;
790 if (nc->discard_my_data)
791 cf |= CF_DISCARD_MY_DATA;
792 if (nc->tentative)
793 cf |= CF_DRY_RUN;
794 p->conn_flags = cpu_to_be32(cf);
795
796 if (connection->agreed_pro_version >= 87)
797 strcpy(p->integrity_alg, nc->integrity_alg);
798 rcu_read_unlock();
799
800 return __conn_send_command(connection, sock, cmd, size, NULL, 0);
801}
802
803int drbd_send_protocol(struct drbd_connection *connection)
804{
805 int err;
806
807 mutex_lock(&connection->data.mutex);
808 err = __drbd_send_protocol(connection, P_PROTOCOL);
809 mutex_unlock(&connection->data.mutex);
810
811 return err;
812}
813
814static int _drbd_send_uuids(struct drbd_peer_device *peer_device, u64 uuid_flags)
815{
816 struct drbd_device *device = peer_device->device;
817 struct drbd_socket *sock;
818 struct p_uuids *p;
819 int i;
820
821 if (!get_ldev_if_state(device, D_NEGOTIATING))
822 return 0;
823
824 sock = &peer_device->connection->data;
825 p = drbd_prepare_command(peer_device, sock);
826 if (!p) {
827 put_ldev(device);
828 return -EIO;
829 }
830 spin_lock_irq(&device->ldev->md.uuid_lock);
831 for (i = UI_CURRENT; i < UI_SIZE; i++)
832 p->uuid[i] = cpu_to_be64(device->ldev->md.uuid[i]);
833 spin_unlock_irq(&device->ldev->md.uuid_lock);
834
835 device->comm_bm_set = drbd_bm_total_weight(device);
836 p->uuid[UI_SIZE] = cpu_to_be64(device->comm_bm_set);
837 rcu_read_lock();
838 uuid_flags |= rcu_dereference(peer_device->connection->net_conf)->discard_my_data ? 1 : 0;
839 rcu_read_unlock();
840 uuid_flags |= test_bit(CRASHED_PRIMARY, &device->flags) ? 2 : 0;
841 uuid_flags |= device->new_state_tmp.disk == D_INCONSISTENT ? 4 : 0;
842 p->uuid[UI_FLAGS] = cpu_to_be64(uuid_flags);
843
844 put_ldev(device);
845 return drbd_send_command(peer_device, sock, P_UUIDS, sizeof(*p), NULL, 0);
846}
847
848int drbd_send_uuids(struct drbd_peer_device *peer_device)
849{
850 return _drbd_send_uuids(peer_device, 0);
851}
852
853int drbd_send_uuids_skip_initial_sync(struct drbd_peer_device *peer_device)
854{
855 return _drbd_send_uuids(peer_device, 8);
856}
857
858void drbd_print_uuids(struct drbd_device *device, const char *text)
859{
860 if (get_ldev_if_state(device, D_NEGOTIATING)) {
861 u64 *uuid = device->ldev->md.uuid;
862 drbd_info(device, "%s %016llX:%016llX:%016llX:%016llX\n",
863 text,
864 (unsigned long long)uuid[UI_CURRENT],
865 (unsigned long long)uuid[UI_BITMAP],
866 (unsigned long long)uuid[UI_HISTORY_START],
867 (unsigned long long)uuid[UI_HISTORY_END]);
868 put_ldev(device);
869 } else {
870 drbd_info(device, "%s effective data uuid: %016llX\n",
871 text,
872 (unsigned long long)device->ed_uuid);
873 }
874}
875
876void drbd_gen_and_send_sync_uuid(struct drbd_peer_device *peer_device)
877{
878 struct drbd_device *device = peer_device->device;
879 struct drbd_socket *sock;
880 struct p_rs_uuid *p;
881 u64 uuid;
882
883 D_ASSERT(device, device->state.disk == D_UP_TO_DATE);
884
885 uuid = device->ldev->md.uuid[UI_BITMAP];
886 if (uuid && uuid != UUID_JUST_CREATED)
887 uuid = uuid + UUID_NEW_BM_OFFSET;
888 else
889 get_random_bytes(&uuid, sizeof(u64));
890 drbd_uuid_set(device, UI_BITMAP, uuid);
891 drbd_print_uuids(device, "updated sync UUID");
892 drbd_md_sync(device);
893
894 sock = &peer_device->connection->data;
895 p = drbd_prepare_command(peer_device, sock);
896 if (p) {
897 p->uuid = cpu_to_be64(uuid);
898 drbd_send_command(peer_device, sock, P_SYNC_UUID, sizeof(*p), NULL, 0);
899 }
900}
901
902
903static void
904assign_p_sizes_qlim(struct drbd_device *device, struct p_sizes *p,
905 struct request_queue *q)
906{
907 if (q) {
908 p->qlim->physical_block_size = cpu_to_be32(queue_physical_block_size(q));
909 p->qlim->logical_block_size = cpu_to_be32(queue_logical_block_size(q));
910 p->qlim->alignment_offset = cpu_to_be32(queue_alignment_offset(q));
911 p->qlim->io_min = cpu_to_be32(queue_io_min(q));
912 p->qlim->io_opt = cpu_to_be32(queue_io_opt(q));
913 p->qlim->discard_enabled = blk_queue_discard(q);
914 p->qlim->write_same_capable = !!q->limits.max_write_same_sectors;
915 } else {
916 q = device->rq_queue;
917 p->qlim->physical_block_size = cpu_to_be32(queue_physical_block_size(q));
918 p->qlim->logical_block_size = cpu_to_be32(queue_logical_block_size(q));
919 p->qlim->alignment_offset = 0;
920 p->qlim->io_min = cpu_to_be32(queue_io_min(q));
921 p->qlim->io_opt = cpu_to_be32(queue_io_opt(q));
922 p->qlim->discard_enabled = 0;
923 p->qlim->write_same_capable = 0;
924 }
925}
926
927int drbd_send_sizes(struct drbd_peer_device *peer_device, int trigger_reply, enum dds_flags flags)
928{
929 struct drbd_device *device = peer_device->device;
930 struct drbd_socket *sock;
931 struct p_sizes *p;
932 sector_t d_size, u_size;
933 int q_order_type;
934 unsigned int max_bio_size;
935 unsigned int packet_size;
936
937 sock = &peer_device->connection->data;
938 p = drbd_prepare_command(peer_device, sock);
939 if (!p)
940 return -EIO;
941
942 packet_size = sizeof(*p);
943 if (peer_device->connection->agreed_features & DRBD_FF_WSAME)
944 packet_size += sizeof(p->qlim[0]);
945
946 memset(p, 0, packet_size);
947 if (get_ldev_if_state(device, D_NEGOTIATING)) {
948 struct request_queue *q = bdev_get_queue(device->ldev->backing_bdev);
949 d_size = drbd_get_max_capacity(device->ldev);
950 rcu_read_lock();
951 u_size = rcu_dereference(device->ldev->disk_conf)->disk_size;
952 rcu_read_unlock();
953 q_order_type = drbd_queue_order_type(device);
954 max_bio_size = queue_max_hw_sectors(q) << 9;
955 max_bio_size = min(max_bio_size, DRBD_MAX_BIO_SIZE);
956 assign_p_sizes_qlim(device, p, q);
957 put_ldev(device);
958 } else {
959 d_size = 0;
960 u_size = 0;
961 q_order_type = QUEUE_ORDERED_NONE;
962 max_bio_size = DRBD_MAX_BIO_SIZE;
963 assign_p_sizes_qlim(device, p, NULL);
964 }
965
966 if (peer_device->connection->agreed_pro_version <= 94)
967 max_bio_size = min(max_bio_size, DRBD_MAX_SIZE_H80_PACKET);
968 else if (peer_device->connection->agreed_pro_version < 100)
969 max_bio_size = min(max_bio_size, DRBD_MAX_BIO_SIZE_P95);
970
971 p->d_size = cpu_to_be64(d_size);
972 p->u_size = cpu_to_be64(u_size);
973 if (trigger_reply)
974 p->c_size = 0;
975 else
976 p->c_size = cpu_to_be64(get_capacity(device->vdisk));
977 p->max_bio_size = cpu_to_be32(max_bio_size);
978 p->queue_order_type = cpu_to_be16(q_order_type);
979 p->dds_flags = cpu_to_be16(flags);
980
981 return drbd_send_command(peer_device, sock, P_SIZES, packet_size, NULL, 0);
982}
983
984
985
986
987
988int drbd_send_current_state(struct drbd_peer_device *peer_device)
989{
990 struct drbd_socket *sock;
991 struct p_state *p;
992
993 sock = &peer_device->connection->data;
994 p = drbd_prepare_command(peer_device, sock);
995 if (!p)
996 return -EIO;
997 p->state = cpu_to_be32(peer_device->device->state.i);
998 return drbd_send_command(peer_device, sock, P_STATE, sizeof(*p), NULL, 0);
999}
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011int drbd_send_state(struct drbd_peer_device *peer_device, union drbd_state state)
1012{
1013 struct drbd_socket *sock;
1014 struct p_state *p;
1015
1016 sock = &peer_device->connection->data;
1017 p = drbd_prepare_command(peer_device, sock);
1018 if (!p)
1019 return -EIO;
1020 p->state = cpu_to_be32(state.i);
1021 return drbd_send_command(peer_device, sock, P_STATE, sizeof(*p), NULL, 0);
1022}
1023
1024int drbd_send_state_req(struct drbd_peer_device *peer_device, union drbd_state mask, union drbd_state val)
1025{
1026 struct drbd_socket *sock;
1027 struct p_req_state *p;
1028
1029 sock = &peer_device->connection->data;
1030 p = drbd_prepare_command(peer_device, sock);
1031 if (!p)
1032 return -EIO;
1033 p->mask = cpu_to_be32(mask.i);
1034 p->val = cpu_to_be32(val.i);
1035 return drbd_send_command(peer_device, sock, P_STATE_CHG_REQ, sizeof(*p), NULL, 0);
1036}
1037
1038int conn_send_state_req(struct drbd_connection *connection, union drbd_state mask, union drbd_state val)
1039{
1040 enum drbd_packet cmd;
1041 struct drbd_socket *sock;
1042 struct p_req_state *p;
1043
1044 cmd = connection->agreed_pro_version < 100 ? P_STATE_CHG_REQ : P_CONN_ST_CHG_REQ;
1045 sock = &connection->data;
1046 p = conn_prepare_command(connection, sock);
1047 if (!p)
1048 return -EIO;
1049 p->mask = cpu_to_be32(mask.i);
1050 p->val = cpu_to_be32(val.i);
1051 return conn_send_command(connection, sock, cmd, sizeof(*p), NULL, 0);
1052}
1053
1054void drbd_send_sr_reply(struct drbd_peer_device *peer_device, enum drbd_state_rv retcode)
1055{
1056 struct drbd_socket *sock;
1057 struct p_req_state_reply *p;
1058
1059 sock = &peer_device->connection->meta;
1060 p = drbd_prepare_command(peer_device, sock);
1061 if (p) {
1062 p->retcode = cpu_to_be32(retcode);
1063 drbd_send_command(peer_device, sock, P_STATE_CHG_REPLY, sizeof(*p), NULL, 0);
1064 }
1065}
1066
1067void conn_send_sr_reply(struct drbd_connection *connection, enum drbd_state_rv retcode)
1068{
1069 struct drbd_socket *sock;
1070 struct p_req_state_reply *p;
1071 enum drbd_packet cmd = connection->agreed_pro_version < 100 ? P_STATE_CHG_REPLY : P_CONN_ST_CHG_REPLY;
1072
1073 sock = &connection->meta;
1074 p = conn_prepare_command(connection, sock);
1075 if (p) {
1076 p->retcode = cpu_to_be32(retcode);
1077 conn_send_command(connection, sock, cmd, sizeof(*p), NULL, 0);
1078 }
1079}
1080
1081static void dcbp_set_code(struct p_compressed_bm *p, enum drbd_bitmap_code code)
1082{
1083 BUG_ON(code & ~0xf);
1084 p->encoding = (p->encoding & ~0xf) | code;
1085}
1086
1087static void dcbp_set_start(struct p_compressed_bm *p, int set)
1088{
1089 p->encoding = (p->encoding & ~0x80) | (set ? 0x80 : 0);
1090}
1091
1092static void dcbp_set_pad_bits(struct p_compressed_bm *p, int n)
1093{
1094 BUG_ON(n & ~0x7);
1095 p->encoding = (p->encoding & (~0x7 << 4)) | (n << 4);
1096}
1097
1098static int fill_bitmap_rle_bits(struct drbd_device *device,
1099 struct p_compressed_bm *p,
1100 unsigned int size,
1101 struct bm_xfer_ctx *c)
1102{
1103 struct bitstream bs;
1104 unsigned long plain_bits;
1105 unsigned long tmp;
1106 unsigned long rl;
1107 unsigned len;
1108 unsigned toggle;
1109 int bits, use_rle;
1110
1111
1112 rcu_read_lock();
1113 use_rle = rcu_dereference(first_peer_device(device)->connection->net_conf)->use_rle;
1114 rcu_read_unlock();
1115 if (!use_rle || first_peer_device(device)->connection->agreed_pro_version < 90)
1116 return 0;
1117
1118 if (c->bit_offset >= c->bm_bits)
1119 return 0;
1120
1121
1122 bitstream_init(&bs, p->code, size, 0);
1123 memset(p->code, 0, size);
1124
1125 plain_bits = 0;
1126
1127
1128
1129
1130 toggle = 2;
1131
1132
1133
1134 do {
1135 tmp = (toggle == 0) ? _drbd_bm_find_next_zero(device, c->bit_offset)
1136 : _drbd_bm_find_next(device, c->bit_offset);
1137 if (tmp == -1UL)
1138 tmp = c->bm_bits;
1139 rl = tmp - c->bit_offset;
1140
1141 if (toggle == 2) {
1142 if (rl == 0) {
1143
1144
1145 dcbp_set_start(p, 1);
1146
1147 toggle = !toggle;
1148 continue;
1149 }
1150 dcbp_set_start(p, 0);
1151 }
1152
1153
1154
1155 if (rl == 0) {
1156 drbd_err(device, "unexpected zero runlength while encoding bitmap "
1157 "t:%u bo:%lu\n", toggle, c->bit_offset);
1158 return -1;
1159 }
1160
1161 bits = vli_encode_bits(&bs, rl);
1162 if (bits == -ENOBUFS)
1163 break;
1164 if (bits <= 0) {
1165 drbd_err(device, "error while encoding bitmap: %d\n", bits);
1166 return 0;
1167 }
1168
1169 toggle = !toggle;
1170 plain_bits += rl;
1171 c->bit_offset = tmp;
1172 } while (c->bit_offset < c->bm_bits);
1173
1174 len = bs.cur.b - p->code + !!bs.cur.bit;
1175
1176 if (plain_bits < (len << 3)) {
1177
1178
1179 c->bit_offset -= plain_bits;
1180 bm_xfer_ctx_bit_to_word_offset(c);
1181 c->bit_offset = c->word_offset * BITS_PER_LONG;
1182 return 0;
1183 }
1184
1185
1186
1187 bm_xfer_ctx_bit_to_word_offset(c);
1188
1189
1190 dcbp_set_pad_bits(p, (8 - bs.cur.bit) & 0x7);
1191
1192 return len;
1193}
1194
1195
1196
1197
1198
1199
1200
1201static int
1202send_bitmap_rle_or_plain(struct drbd_device *device, struct bm_xfer_ctx *c)
1203{
1204 struct drbd_socket *sock = &first_peer_device(device)->connection->data;
1205 unsigned int header_size = drbd_header_size(first_peer_device(device)->connection);
1206 struct p_compressed_bm *p = sock->sbuf + header_size;
1207 int len, err;
1208
1209 len = fill_bitmap_rle_bits(device, p,
1210 DRBD_SOCKET_BUFFER_SIZE - header_size - sizeof(*p), c);
1211 if (len < 0)
1212 return -EIO;
1213
1214 if (len) {
1215 dcbp_set_code(p, RLE_VLI_Bits);
1216 err = __send_command(first_peer_device(device)->connection, device->vnr, sock,
1217 P_COMPRESSED_BITMAP, sizeof(*p) + len,
1218 NULL, 0);
1219 c->packets[0]++;
1220 c->bytes[0] += header_size + sizeof(*p) + len;
1221
1222 if (c->bit_offset >= c->bm_bits)
1223 len = 0;
1224 } else {
1225
1226
1227 unsigned int data_size;
1228 unsigned long num_words;
1229 unsigned long *p = sock->sbuf + header_size;
1230
1231 data_size = DRBD_SOCKET_BUFFER_SIZE - header_size;
1232 num_words = min_t(size_t, data_size / sizeof(*p),
1233 c->bm_words - c->word_offset);
1234 len = num_words * sizeof(*p);
1235 if (len)
1236 drbd_bm_get_lel(device, c->word_offset, num_words, p);
1237 err = __send_command(first_peer_device(device)->connection, device->vnr, sock, P_BITMAP, len, NULL, 0);
1238 c->word_offset += num_words;
1239 c->bit_offset = c->word_offset * BITS_PER_LONG;
1240
1241 c->packets[1]++;
1242 c->bytes[1] += header_size + len;
1243
1244 if (c->bit_offset > c->bm_bits)
1245 c->bit_offset = c->bm_bits;
1246 }
1247 if (!err) {
1248 if (len == 0) {
1249 INFO_bm_xfer_stats(device, "send", c);
1250 return 0;
1251 } else
1252 return 1;
1253 }
1254 return -EIO;
1255}
1256
1257
1258static int _drbd_send_bitmap(struct drbd_device *device)
1259{
1260 struct bm_xfer_ctx c;
1261 int err;
1262
1263 if (!expect(device->bitmap))
1264 return false;
1265
1266 if (get_ldev(device)) {
1267 if (drbd_md_test_flag(device->ldev, MDF_FULL_SYNC)) {
1268 drbd_info(device, "Writing the whole bitmap, MDF_FullSync was set.\n");
1269 drbd_bm_set_all(device);
1270 if (drbd_bm_write(device)) {
1271
1272
1273
1274 drbd_err(device, "Failed to write bitmap to disk!\n");
1275 } else {
1276 drbd_md_clear_flag(device, MDF_FULL_SYNC);
1277 drbd_md_sync(device);
1278 }
1279 }
1280 put_ldev(device);
1281 }
1282
1283 c = (struct bm_xfer_ctx) {
1284 .bm_bits = drbd_bm_bits(device),
1285 .bm_words = drbd_bm_words(device),
1286 };
1287
1288 do {
1289 err = send_bitmap_rle_or_plain(device, &c);
1290 } while (err > 0);
1291
1292 return err == 0;
1293}
1294
1295int drbd_send_bitmap(struct drbd_device *device)
1296{
1297 struct drbd_socket *sock = &first_peer_device(device)->connection->data;
1298 int err = -1;
1299
1300 mutex_lock(&sock->mutex);
1301 if (sock->socket)
1302 err = !_drbd_send_bitmap(device);
1303 mutex_unlock(&sock->mutex);
1304 return err;
1305}
1306
1307void drbd_send_b_ack(struct drbd_connection *connection, u32 barrier_nr, u32 set_size)
1308{
1309 struct drbd_socket *sock;
1310 struct p_barrier_ack *p;
1311
1312 if (connection->cstate < C_WF_REPORT_PARAMS)
1313 return;
1314
1315 sock = &connection->meta;
1316 p = conn_prepare_command(connection, sock);
1317 if (!p)
1318 return;
1319 p->barrier = barrier_nr;
1320 p->set_size = cpu_to_be32(set_size);
1321 conn_send_command(connection, sock, P_BARRIER_ACK, sizeof(*p), NULL, 0);
1322}
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332static int _drbd_send_ack(struct drbd_peer_device *peer_device, enum drbd_packet cmd,
1333 u64 sector, u32 blksize, u64 block_id)
1334{
1335 struct drbd_socket *sock;
1336 struct p_block_ack *p;
1337
1338 if (peer_device->device->state.conn < C_CONNECTED)
1339 return -EIO;
1340
1341 sock = &peer_device->connection->meta;
1342 p = drbd_prepare_command(peer_device, sock);
1343 if (!p)
1344 return -EIO;
1345 p->sector = sector;
1346 p->block_id = block_id;
1347 p->blksize = blksize;
1348 p->seq_num = cpu_to_be32(atomic_inc_return(&peer_device->device->packet_seq));
1349 return drbd_send_command(peer_device, sock, cmd, sizeof(*p), NULL, 0);
1350}
1351
1352
1353
1354
1355void drbd_send_ack_dp(struct drbd_peer_device *peer_device, enum drbd_packet cmd,
1356 struct p_data *dp, int data_size)
1357{
1358 if (peer_device->connection->peer_integrity_tfm)
1359 data_size -= crypto_shash_digestsize(peer_device->connection->peer_integrity_tfm);
1360 _drbd_send_ack(peer_device, cmd, dp->sector, cpu_to_be32(data_size),
1361 dp->block_id);
1362}
1363
1364void drbd_send_ack_rp(struct drbd_peer_device *peer_device, enum drbd_packet cmd,
1365 struct p_block_req *rp)
1366{
1367 _drbd_send_ack(peer_device, cmd, rp->sector, rp->blksize, rp->block_id);
1368}
1369
1370
1371
1372
1373
1374
1375
1376int drbd_send_ack(struct drbd_peer_device *peer_device, enum drbd_packet cmd,
1377 struct drbd_peer_request *peer_req)
1378{
1379 return _drbd_send_ack(peer_device, cmd,
1380 cpu_to_be64(peer_req->i.sector),
1381 cpu_to_be32(peer_req->i.size),
1382 peer_req->block_id);
1383}
1384
1385
1386
1387int drbd_send_ack_ex(struct drbd_peer_device *peer_device, enum drbd_packet cmd,
1388 sector_t sector, int blksize, u64 block_id)
1389{
1390 return _drbd_send_ack(peer_device, cmd,
1391 cpu_to_be64(sector),
1392 cpu_to_be32(blksize),
1393 cpu_to_be64(block_id));
1394}
1395
1396int drbd_send_rs_deallocated(struct drbd_peer_device *peer_device,
1397 struct drbd_peer_request *peer_req)
1398{
1399 struct drbd_socket *sock;
1400 struct p_block_desc *p;
1401
1402 sock = &peer_device->connection->data;
1403 p = drbd_prepare_command(peer_device, sock);
1404 if (!p)
1405 return -EIO;
1406 p->sector = cpu_to_be64(peer_req->i.sector);
1407 p->blksize = cpu_to_be32(peer_req->i.size);
1408 p->pad = 0;
1409 return drbd_send_command(peer_device, sock, P_RS_DEALLOCATED, sizeof(*p), NULL, 0);
1410}
1411
1412int drbd_send_drequest(struct drbd_peer_device *peer_device, int cmd,
1413 sector_t sector, int size, u64 block_id)
1414{
1415 struct drbd_socket *sock;
1416 struct p_block_req *p;
1417
1418 sock = &peer_device->connection->data;
1419 p = drbd_prepare_command(peer_device, sock);
1420 if (!p)
1421 return -EIO;
1422 p->sector = cpu_to_be64(sector);
1423 p->block_id = block_id;
1424 p->blksize = cpu_to_be32(size);
1425 return drbd_send_command(peer_device, sock, cmd, sizeof(*p), NULL, 0);
1426}
1427
1428int drbd_send_drequest_csum(struct drbd_peer_device *peer_device, sector_t sector, int size,
1429 void *digest, int digest_size, enum drbd_packet cmd)
1430{
1431 struct drbd_socket *sock;
1432 struct p_block_req *p;
1433
1434
1435
1436 sock = &peer_device->connection->data;
1437 p = drbd_prepare_command(peer_device, sock);
1438 if (!p)
1439 return -EIO;
1440 p->sector = cpu_to_be64(sector);
1441 p->block_id = ID_SYNCER ;
1442 p->blksize = cpu_to_be32(size);
1443 return drbd_send_command(peer_device, sock, cmd, sizeof(*p), digest, digest_size);
1444}
1445
1446int drbd_send_ov_request(struct drbd_peer_device *peer_device, sector_t sector, int size)
1447{
1448 struct drbd_socket *sock;
1449 struct p_block_req *p;
1450
1451 sock = &peer_device->connection->data;
1452 p = drbd_prepare_command(peer_device, sock);
1453 if (!p)
1454 return -EIO;
1455 p->sector = cpu_to_be64(sector);
1456 p->block_id = ID_SYNCER ;
1457 p->blksize = cpu_to_be32(size);
1458 return drbd_send_command(peer_device, sock, P_OV_REQUEST, sizeof(*p), NULL, 0);
1459}
1460
1461
1462
1463
1464
1465static int we_should_drop_the_connection(struct drbd_connection *connection, struct socket *sock)
1466{
1467 int drop_it;
1468
1469
1470 drop_it = connection->meta.socket == sock
1471 || !connection->ack_receiver.task
1472 || get_t_state(&connection->ack_receiver) != RUNNING
1473 || connection->cstate < C_WF_REPORT_PARAMS;
1474
1475 if (drop_it)
1476 return true;
1477
1478 drop_it = !--connection->ko_count;
1479 if (!drop_it) {
1480 drbd_err(connection, "[%s/%d] sock_sendmsg time expired, ko = %u\n",
1481 current->comm, current->pid, connection->ko_count);
1482 request_ping(connection);
1483 }
1484
1485 return drop_it; ;
1486}
1487
1488static void drbd_update_congested(struct drbd_connection *connection)
1489{
1490 struct sock *sk = connection->data.socket->sk;
1491 if (sk->sk_wmem_queued > sk->sk_sndbuf * 4 / 5)
1492 set_bit(NET_CONGESTED, &connection->flags);
1493}
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516static int _drbd_no_send_page(struct drbd_peer_device *peer_device, struct page *page,
1517 int offset, size_t size, unsigned msg_flags)
1518{
1519 struct socket *socket;
1520 void *addr;
1521 int err;
1522
1523 socket = peer_device->connection->data.socket;
1524 addr = kmap(page) + offset;
1525 err = drbd_send_all(peer_device->connection, socket, addr, size, msg_flags);
1526 kunmap(page);
1527 if (!err)
1528 peer_device->device->send_cnt += size >> 9;
1529 return err;
1530}
1531
1532static int _drbd_send_page(struct drbd_peer_device *peer_device, struct page *page,
1533 int offset, size_t size, unsigned msg_flags)
1534{
1535 struct socket *socket = peer_device->connection->data.socket;
1536 int len = size;
1537 int err = -EIO;
1538
1539
1540
1541
1542
1543
1544
1545 if (drbd_disable_sendpage || !sendpage_ok(page))
1546 return _drbd_no_send_page(peer_device, page, offset, size, msg_flags);
1547
1548 msg_flags |= MSG_NOSIGNAL;
1549 drbd_update_congested(peer_device->connection);
1550 do {
1551 int sent;
1552
1553 sent = socket->ops->sendpage(socket, page, offset, len, msg_flags);
1554 if (sent <= 0) {
1555 if (sent == -EAGAIN) {
1556 if (we_should_drop_the_connection(peer_device->connection, socket))
1557 break;
1558 continue;
1559 }
1560 drbd_warn(peer_device->device, "%s: size=%d len=%d sent=%d\n",
1561 __func__, (int)size, len, sent);
1562 if (sent < 0)
1563 err = sent;
1564 break;
1565 }
1566 len -= sent;
1567 offset += sent;
1568 } while (len > 0 );
1569 clear_bit(NET_CONGESTED, &peer_device->connection->flags);
1570
1571 if (len == 0) {
1572 err = 0;
1573 peer_device->device->send_cnt += size >> 9;
1574 }
1575 return err;
1576}
1577
1578static int _drbd_send_bio(struct drbd_peer_device *peer_device, struct bio *bio)
1579{
1580 struct bio_vec bvec;
1581 struct bvec_iter iter;
1582
1583
1584 bio_for_each_segment(bvec, bio, iter) {
1585 int err;
1586
1587 err = _drbd_no_send_page(peer_device, bvec.bv_page,
1588 bvec.bv_offset, bvec.bv_len,
1589 bio_iter_last(bvec, iter)
1590 ? 0 : MSG_MORE);
1591 if (err)
1592 return err;
1593
1594 if (bio_op(bio) == REQ_OP_WRITE_SAME)
1595 break;
1596 }
1597 return 0;
1598}
1599
1600static int _drbd_send_zc_bio(struct drbd_peer_device *peer_device, struct bio *bio)
1601{
1602 struct bio_vec bvec;
1603 struct bvec_iter iter;
1604
1605
1606 bio_for_each_segment(bvec, bio, iter) {
1607 int err;
1608
1609 err = _drbd_send_page(peer_device, bvec.bv_page,
1610 bvec.bv_offset, bvec.bv_len,
1611 bio_iter_last(bvec, iter) ? 0 : MSG_MORE);
1612 if (err)
1613 return err;
1614
1615 if (bio_op(bio) == REQ_OP_WRITE_SAME)
1616 break;
1617 }
1618 return 0;
1619}
1620
1621static int _drbd_send_zc_ee(struct drbd_peer_device *peer_device,
1622 struct drbd_peer_request *peer_req)
1623{
1624 struct page *page = peer_req->pages;
1625 unsigned len = peer_req->i.size;
1626 int err;
1627
1628
1629 page_chain_for_each(page) {
1630 unsigned l = min_t(unsigned, len, PAGE_SIZE);
1631
1632 err = _drbd_send_page(peer_device, page, 0, l,
1633 page_chain_next(page) ? MSG_MORE : 0);
1634 if (err)
1635 return err;
1636 len -= l;
1637 }
1638 return 0;
1639}
1640
1641static u32 bio_flags_to_wire(struct drbd_connection *connection,
1642 struct bio *bio)
1643{
1644 if (connection->agreed_pro_version >= 95)
1645 return (bio->bi_opf & REQ_SYNC ? DP_RW_SYNC : 0) |
1646 (bio->bi_opf & REQ_FUA ? DP_FUA : 0) |
1647 (bio->bi_opf & REQ_PREFLUSH ? DP_FLUSH : 0) |
1648 (bio_op(bio) == REQ_OP_WRITE_SAME ? DP_WSAME : 0) |
1649 (bio_op(bio) == REQ_OP_DISCARD ? DP_DISCARD : 0) |
1650 (bio_op(bio) == REQ_OP_WRITE_ZEROES ?
1651 ((connection->agreed_features & DRBD_FF_WZEROES) ?
1652 (DP_ZEROES |(!(bio->bi_opf & REQ_NOUNMAP) ? DP_DISCARD : 0))
1653 : DP_DISCARD)
1654 : 0);
1655 else
1656 return bio->bi_opf & REQ_SYNC ? DP_RW_SYNC : 0;
1657}
1658
1659
1660
1661
1662int drbd_send_dblock(struct drbd_peer_device *peer_device, struct drbd_request *req)
1663{
1664 struct drbd_device *device = peer_device->device;
1665 struct drbd_socket *sock;
1666 struct p_data *p;
1667 struct p_wsame *wsame = NULL;
1668 void *digest_out;
1669 unsigned int dp_flags = 0;
1670 int digest_size;
1671 int err;
1672
1673 sock = &peer_device->connection->data;
1674 p = drbd_prepare_command(peer_device, sock);
1675 digest_size = peer_device->connection->integrity_tfm ?
1676 crypto_shash_digestsize(peer_device->connection->integrity_tfm) : 0;
1677
1678 if (!p)
1679 return -EIO;
1680 p->sector = cpu_to_be64(req->i.sector);
1681 p->block_id = (unsigned long)req;
1682 p->seq_num = cpu_to_be32(atomic_inc_return(&device->packet_seq));
1683 dp_flags = bio_flags_to_wire(peer_device->connection, req->master_bio);
1684 if (device->state.conn >= C_SYNC_SOURCE &&
1685 device->state.conn <= C_PAUSED_SYNC_T)
1686 dp_flags |= DP_MAY_SET_IN_SYNC;
1687 if (peer_device->connection->agreed_pro_version >= 100) {
1688 if (req->rq_state & RQ_EXP_RECEIVE_ACK)
1689 dp_flags |= DP_SEND_RECEIVE_ACK;
1690
1691
1692 if (req->rq_state & RQ_EXP_WRITE_ACK
1693 || (dp_flags & DP_MAY_SET_IN_SYNC))
1694 dp_flags |= DP_SEND_WRITE_ACK;
1695 }
1696 p->dp_flags = cpu_to_be32(dp_flags);
1697
1698 if (dp_flags & (DP_DISCARD|DP_ZEROES)) {
1699 enum drbd_packet cmd = (dp_flags & DP_ZEROES) ? P_ZEROES : P_TRIM;
1700 struct p_trim *t = (struct p_trim*)p;
1701 t->size = cpu_to_be32(req->i.size);
1702 err = __send_command(peer_device->connection, device->vnr, sock, cmd, sizeof(*t), NULL, 0);
1703 goto out;
1704 }
1705 if (dp_flags & DP_WSAME) {
1706
1707
1708
1709 wsame = (struct p_wsame*)p;
1710 digest_out = wsame + 1;
1711 wsame->size = cpu_to_be32(req->i.size);
1712 } else
1713 digest_out = p + 1;
1714
1715
1716
1717 if (digest_size)
1718 drbd_csum_bio(peer_device->connection->integrity_tfm, req->master_bio, digest_out);
1719 if (wsame) {
1720 err =
1721 __send_command(peer_device->connection, device->vnr, sock, P_WSAME,
1722 sizeof(*wsame) + digest_size, NULL,
1723 bio_iovec(req->master_bio).bv_len);
1724 } else
1725 err =
1726 __send_command(peer_device->connection, device->vnr, sock, P_DATA,
1727 sizeof(*p) + digest_size, NULL, req->i.size);
1728 if (!err) {
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740 if (!(req->rq_state & (RQ_EXP_RECEIVE_ACK | RQ_EXP_WRITE_ACK)) || digest_size)
1741 err = _drbd_send_bio(peer_device, req->master_bio);
1742 else
1743 err = _drbd_send_zc_bio(peer_device, req->master_bio);
1744
1745
1746 if (digest_size > 0 && digest_size <= 64) {
1747
1748
1749 unsigned char digest[64];
1750 drbd_csum_bio(peer_device->connection->integrity_tfm, req->master_bio, digest);
1751 if (memcmp(p + 1, digest, digest_size)) {
1752 drbd_warn(device,
1753 "Digest mismatch, buffer modified by upper layers during write: %llus +%u\n",
1754 (unsigned long long)req->i.sector, req->i.size);
1755 }
1756 }
1757
1758
1759 }
1760out:
1761 mutex_unlock(&sock->mutex);
1762
1763 return err;
1764}
1765
1766
1767
1768
1769
1770int drbd_send_block(struct drbd_peer_device *peer_device, enum drbd_packet cmd,
1771 struct drbd_peer_request *peer_req)
1772{
1773 struct drbd_device *device = peer_device->device;
1774 struct drbd_socket *sock;
1775 struct p_data *p;
1776 int err;
1777 int digest_size;
1778
1779 sock = &peer_device->connection->data;
1780 p = drbd_prepare_command(peer_device, sock);
1781
1782 digest_size = peer_device->connection->integrity_tfm ?
1783 crypto_shash_digestsize(peer_device->connection->integrity_tfm) : 0;
1784
1785 if (!p)
1786 return -EIO;
1787 p->sector = cpu_to_be64(peer_req->i.sector);
1788 p->block_id = peer_req->block_id;
1789 p->seq_num = 0;
1790 p->dp_flags = 0;
1791 if (digest_size)
1792 drbd_csum_ee(peer_device->connection->integrity_tfm, peer_req, p + 1);
1793 err = __send_command(peer_device->connection, device->vnr, sock, cmd, sizeof(*p) + digest_size, NULL, peer_req->i.size);
1794 if (!err)
1795 err = _drbd_send_zc_ee(peer_device, peer_req);
1796 mutex_unlock(&sock->mutex);
1797
1798 return err;
1799}
1800
1801int drbd_send_out_of_sync(struct drbd_peer_device *peer_device, struct drbd_request *req)
1802{
1803 struct drbd_socket *sock;
1804 struct p_block_desc *p;
1805
1806 sock = &peer_device->connection->data;
1807 p = drbd_prepare_command(peer_device, sock);
1808 if (!p)
1809 return -EIO;
1810 p->sector = cpu_to_be64(req->i.sector);
1811 p->blksize = cpu_to_be32(req->i.size);
1812 return drbd_send_command(peer_device, sock, P_OUT_OF_SYNC, sizeof(*p), NULL, 0);
1813}
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831int drbd_send(struct drbd_connection *connection, struct socket *sock,
1832 void *buf, size_t size, unsigned msg_flags)
1833{
1834 struct kvec iov = {.iov_base = buf, .iov_len = size};
1835 struct msghdr msg = {.msg_flags = msg_flags | MSG_NOSIGNAL};
1836 int rv, sent = 0;
1837
1838 if (!sock)
1839 return -EBADR;
1840
1841
1842
1843 iov_iter_kvec(&msg.msg_iter, WRITE, &iov, 1, size);
1844
1845 if (sock == connection->data.socket) {
1846 rcu_read_lock();
1847 connection->ko_count = rcu_dereference(connection->net_conf)->ko_count;
1848 rcu_read_unlock();
1849 drbd_update_congested(connection);
1850 }
1851 do {
1852 rv = sock_sendmsg(sock, &msg);
1853 if (rv == -EAGAIN) {
1854 if (we_should_drop_the_connection(connection, sock))
1855 break;
1856 else
1857 continue;
1858 }
1859 if (rv == -EINTR) {
1860 flush_signals(current);
1861 rv = 0;
1862 }
1863 if (rv < 0)
1864 break;
1865 sent += rv;
1866 } while (sent < size);
1867
1868 if (sock == connection->data.socket)
1869 clear_bit(NET_CONGESTED, &connection->flags);
1870
1871 if (rv <= 0) {
1872 if (rv != -EAGAIN) {
1873 drbd_err(connection, "%s_sendmsg returned %d\n",
1874 sock == connection->meta.socket ? "msock" : "sock",
1875 rv);
1876 conn_request_state(connection, NS(conn, C_BROKEN_PIPE), CS_HARD);
1877 } else
1878 conn_request_state(connection, NS(conn, C_TIMEOUT), CS_HARD);
1879 }
1880
1881 return sent;
1882}
1883
1884
1885
1886
1887
1888
1889int drbd_send_all(struct drbd_connection *connection, struct socket *sock, void *buffer,
1890 size_t size, unsigned msg_flags)
1891{
1892 int err;
1893
1894 err = drbd_send(connection, sock, buffer, size, msg_flags);
1895 if (err < 0)
1896 return err;
1897 if (err != size)
1898 return -EIO;
1899 return 0;
1900}
1901
1902static int drbd_open(struct block_device *bdev, fmode_t mode)
1903{
1904 struct drbd_device *device = bdev->bd_disk->private_data;
1905 unsigned long flags;
1906 int rv = 0;
1907
1908 mutex_lock(&drbd_main_mutex);
1909 spin_lock_irqsave(&device->resource->req_lock, flags);
1910
1911
1912
1913 if (device->state.role != R_PRIMARY) {
1914 if (mode & FMODE_WRITE)
1915 rv = -EROFS;
1916 else if (!drbd_allow_oos)
1917 rv = -EMEDIUMTYPE;
1918 }
1919
1920 if (!rv)
1921 device->open_cnt++;
1922 spin_unlock_irqrestore(&device->resource->req_lock, flags);
1923 mutex_unlock(&drbd_main_mutex);
1924
1925 return rv;
1926}
1927
1928static void drbd_release(struct gendisk *gd, fmode_t mode)
1929{
1930 struct drbd_device *device = gd->private_data;
1931 mutex_lock(&drbd_main_mutex);
1932 device->open_cnt--;
1933 mutex_unlock(&drbd_main_mutex);
1934}
1935
1936
1937void drbd_queue_unplug(struct drbd_device *device)
1938{
1939 if (device->state.pdsk >= D_INCONSISTENT && device->state.conn >= C_CONNECTED) {
1940 D_ASSERT(device, device->state.role == R_PRIMARY);
1941 if (test_and_clear_bit(UNPLUG_REMOTE, &device->flags)) {
1942 drbd_queue_work_if_unqueued(
1943 &first_peer_device(device)->connection->sender_work,
1944 &device->unplug_work);
1945 }
1946 }
1947}
1948
1949static void drbd_set_defaults(struct drbd_device *device)
1950{
1951
1952
1953 device->state = (union drbd_dev_state) {
1954 { .role = R_SECONDARY,
1955 .peer = R_UNKNOWN,
1956 .conn = C_STANDALONE,
1957 .disk = D_DISKLESS,
1958 .pdsk = D_UNKNOWN,
1959 } };
1960}
1961
1962void drbd_init_set_defaults(struct drbd_device *device)
1963{
1964
1965
1966
1967 drbd_set_defaults(device);
1968
1969 atomic_set(&device->ap_bio_cnt, 0);
1970 atomic_set(&device->ap_actlog_cnt, 0);
1971 atomic_set(&device->ap_pending_cnt, 0);
1972 atomic_set(&device->rs_pending_cnt, 0);
1973 atomic_set(&device->unacked_cnt, 0);
1974 atomic_set(&device->local_cnt, 0);
1975 atomic_set(&device->pp_in_use_by_net, 0);
1976 atomic_set(&device->rs_sect_in, 0);
1977 atomic_set(&device->rs_sect_ev, 0);
1978 atomic_set(&device->ap_in_flight, 0);
1979 atomic_set(&device->md_io.in_use, 0);
1980
1981 mutex_init(&device->own_state_mutex);
1982 device->state_mutex = &device->own_state_mutex;
1983
1984 spin_lock_init(&device->al_lock);
1985 spin_lock_init(&device->peer_seq_lock);
1986
1987 INIT_LIST_HEAD(&device->active_ee);
1988 INIT_LIST_HEAD(&device->sync_ee);
1989 INIT_LIST_HEAD(&device->done_ee);
1990 INIT_LIST_HEAD(&device->read_ee);
1991 INIT_LIST_HEAD(&device->net_ee);
1992 INIT_LIST_HEAD(&device->resync_reads);
1993 INIT_LIST_HEAD(&device->resync_work.list);
1994 INIT_LIST_HEAD(&device->unplug_work.list);
1995 INIT_LIST_HEAD(&device->bm_io_work.w.list);
1996 INIT_LIST_HEAD(&device->pending_master_completion[0]);
1997 INIT_LIST_HEAD(&device->pending_master_completion[1]);
1998 INIT_LIST_HEAD(&device->pending_completion[0]);
1999 INIT_LIST_HEAD(&device->pending_completion[1]);
2000
2001 device->resync_work.cb = w_resync_timer;
2002 device->unplug_work.cb = w_send_write_hint;
2003 device->bm_io_work.w.cb = w_bitmap_io;
2004
2005 timer_setup(&device->resync_timer, resync_timer_fn, 0);
2006 timer_setup(&device->md_sync_timer, md_sync_timer_fn, 0);
2007 timer_setup(&device->start_resync_timer, start_resync_timer_fn, 0);
2008 timer_setup(&device->request_timer, request_timer_fn, 0);
2009
2010 init_waitqueue_head(&device->misc_wait);
2011 init_waitqueue_head(&device->state_wait);
2012 init_waitqueue_head(&device->ee_wait);
2013 init_waitqueue_head(&device->al_wait);
2014 init_waitqueue_head(&device->seq_wait);
2015
2016 device->resync_wenr = LC_FREE;
2017 device->peer_max_bio_size = DRBD_MAX_BIO_SIZE_SAFE;
2018 device->local_max_bio_size = DRBD_MAX_BIO_SIZE_SAFE;
2019}
2020
2021void drbd_set_my_capacity(struct drbd_device *device, sector_t size)
2022{
2023 char ppb[10];
2024
2025 set_capacity_and_notify(device->vdisk, size);
2026
2027 drbd_info(device, "size = %s (%llu KB)\n",
2028 ppsize(ppb, size>>1), (unsigned long long)size>>1);
2029}
2030
2031void drbd_device_cleanup(struct drbd_device *device)
2032{
2033 int i;
2034 if (first_peer_device(device)->connection->receiver.t_state != NONE)
2035 drbd_err(device, "ASSERT FAILED: receiver t_state == %d expected 0.\n",
2036 first_peer_device(device)->connection->receiver.t_state);
2037
2038 device->al_writ_cnt =
2039 device->bm_writ_cnt =
2040 device->read_cnt =
2041 device->recv_cnt =
2042 device->send_cnt =
2043 device->writ_cnt =
2044 device->p_size =
2045 device->rs_start =
2046 device->rs_total =
2047 device->rs_failed = 0;
2048 device->rs_last_events = 0;
2049 device->rs_last_sect_ev = 0;
2050 for (i = 0; i < DRBD_SYNC_MARKS; i++) {
2051 device->rs_mark_left[i] = 0;
2052 device->rs_mark_time[i] = 0;
2053 }
2054 D_ASSERT(device, first_peer_device(device)->connection->net_conf == NULL);
2055
2056 set_capacity_and_notify(device->vdisk, 0);
2057 if (device->bitmap) {
2058
2059 drbd_bm_resize(device, 0, 1);
2060 drbd_bm_cleanup(device);
2061 }
2062
2063 drbd_backing_dev_free(device, device->ldev);
2064 device->ldev = NULL;
2065
2066 clear_bit(AL_SUSPENDED, &device->flags);
2067
2068 D_ASSERT(device, list_empty(&device->active_ee));
2069 D_ASSERT(device, list_empty(&device->sync_ee));
2070 D_ASSERT(device, list_empty(&device->done_ee));
2071 D_ASSERT(device, list_empty(&device->read_ee));
2072 D_ASSERT(device, list_empty(&device->net_ee));
2073 D_ASSERT(device, list_empty(&device->resync_reads));
2074 D_ASSERT(device, list_empty(&first_peer_device(device)->connection->sender_work.q));
2075 D_ASSERT(device, list_empty(&device->resync_work.list));
2076 D_ASSERT(device, list_empty(&device->unplug_work.list));
2077
2078 drbd_set_defaults(device);
2079}
2080
2081
2082static void drbd_destroy_mempools(void)
2083{
2084 struct page *page;
2085
2086 while (drbd_pp_pool) {
2087 page = drbd_pp_pool;
2088 drbd_pp_pool = (struct page *)page_private(page);
2089 __free_page(page);
2090 drbd_pp_vacant--;
2091 }
2092
2093
2094
2095 bioset_exit(&drbd_io_bio_set);
2096 bioset_exit(&drbd_md_io_bio_set);
2097 mempool_exit(&drbd_md_io_page_pool);
2098 mempool_exit(&drbd_ee_mempool);
2099 mempool_exit(&drbd_request_mempool);
2100 kmem_cache_destroy(drbd_ee_cache);
2101 kmem_cache_destroy(drbd_request_cache);
2102 kmem_cache_destroy(drbd_bm_ext_cache);
2103 kmem_cache_destroy(drbd_al_ext_cache);
2104
2105 drbd_ee_cache = NULL;
2106 drbd_request_cache = NULL;
2107 drbd_bm_ext_cache = NULL;
2108 drbd_al_ext_cache = NULL;
2109
2110 return;
2111}
2112
2113static int drbd_create_mempools(void)
2114{
2115 struct page *page;
2116 const int number = (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * drbd_minor_count;
2117 int i, ret;
2118
2119
2120 drbd_request_cache = kmem_cache_create(
2121 "drbd_req", sizeof(struct drbd_request), 0, 0, NULL);
2122 if (drbd_request_cache == NULL)
2123 goto Enomem;
2124
2125 drbd_ee_cache = kmem_cache_create(
2126 "drbd_ee", sizeof(struct drbd_peer_request), 0, 0, NULL);
2127 if (drbd_ee_cache == NULL)
2128 goto Enomem;
2129
2130 drbd_bm_ext_cache = kmem_cache_create(
2131 "drbd_bm", sizeof(struct bm_extent), 0, 0, NULL);
2132 if (drbd_bm_ext_cache == NULL)
2133 goto Enomem;
2134
2135 drbd_al_ext_cache = kmem_cache_create(
2136 "drbd_al", sizeof(struct lc_element), 0, 0, NULL);
2137 if (drbd_al_ext_cache == NULL)
2138 goto Enomem;
2139
2140
2141 ret = bioset_init(&drbd_io_bio_set, BIO_POOL_SIZE, 0, 0);
2142 if (ret)
2143 goto Enomem;
2144
2145 ret = bioset_init(&drbd_md_io_bio_set, DRBD_MIN_POOL_PAGES, 0,
2146 BIOSET_NEED_BVECS);
2147 if (ret)
2148 goto Enomem;
2149
2150 ret = mempool_init_page_pool(&drbd_md_io_page_pool, DRBD_MIN_POOL_PAGES, 0);
2151 if (ret)
2152 goto Enomem;
2153
2154 ret = mempool_init_slab_pool(&drbd_request_mempool, number,
2155 drbd_request_cache);
2156 if (ret)
2157 goto Enomem;
2158
2159 ret = mempool_init_slab_pool(&drbd_ee_mempool, number, drbd_ee_cache);
2160 if (ret)
2161 goto Enomem;
2162
2163 for (i = 0; i < number; i++) {
2164 page = alloc_page(GFP_HIGHUSER);
2165 if (!page)
2166 goto Enomem;
2167 set_page_private(page, (unsigned long)drbd_pp_pool);
2168 drbd_pp_pool = page;
2169 }
2170 drbd_pp_vacant = number;
2171
2172 return 0;
2173
2174Enomem:
2175 drbd_destroy_mempools();
2176 return -ENOMEM;
2177}
2178
2179static void drbd_release_all_peer_reqs(struct drbd_device *device)
2180{
2181 int rr;
2182
2183 rr = drbd_free_peer_reqs(device, &device->active_ee);
2184 if (rr)
2185 drbd_err(device, "%d EEs in active list found!\n", rr);
2186
2187 rr = drbd_free_peer_reqs(device, &device->sync_ee);
2188 if (rr)
2189 drbd_err(device, "%d EEs in sync list found!\n", rr);
2190
2191 rr = drbd_free_peer_reqs(device, &device->read_ee);
2192 if (rr)
2193 drbd_err(device, "%d EEs in read list found!\n", rr);
2194
2195 rr = drbd_free_peer_reqs(device, &device->done_ee);
2196 if (rr)
2197 drbd_err(device, "%d EEs in done list found!\n", rr);
2198
2199 rr = drbd_free_peer_reqs(device, &device->net_ee);
2200 if (rr)
2201 drbd_err(device, "%d EEs in net list found!\n", rr);
2202}
2203
2204
2205void drbd_destroy_device(struct kref *kref)
2206{
2207 struct drbd_device *device = container_of(kref, struct drbd_device, kref);
2208 struct drbd_resource *resource = device->resource;
2209 struct drbd_peer_device *peer_device, *tmp_peer_device;
2210
2211 del_timer_sync(&device->request_timer);
2212
2213
2214 D_ASSERT(device, device->open_cnt == 0);
2215
2216
2217
2218
2219
2220 drbd_backing_dev_free(device, device->ldev);
2221 device->ldev = NULL;
2222
2223 drbd_release_all_peer_reqs(device);
2224
2225 lc_destroy(device->act_log);
2226 lc_destroy(device->resync);
2227
2228 kfree(device->p_uuid);
2229
2230
2231 if (device->bitmap)
2232 drbd_bm_cleanup(device);
2233 __free_page(device->md_io.page);
2234 blk_cleanup_disk(device->vdisk);
2235 kfree(device->rs_plan_s);
2236
2237
2238
2239
2240 for_each_peer_device_safe(peer_device, tmp_peer_device, device) {
2241 kref_put(&peer_device->connection->kref, drbd_destroy_connection);
2242 kfree(peer_device);
2243 }
2244 memset(device, 0xfd, sizeof(*device));
2245 kfree(device);
2246 kref_put(&resource->kref, drbd_destroy_resource);
2247}
2248
2249
2250
2251
2252static struct retry_worker {
2253 struct workqueue_struct *wq;
2254 struct work_struct worker;
2255
2256 spinlock_t lock;
2257 struct list_head writes;
2258} retry;
2259
2260static void do_retry(struct work_struct *ws)
2261{
2262 struct retry_worker *retry = container_of(ws, struct retry_worker, worker);
2263 LIST_HEAD(writes);
2264 struct drbd_request *req, *tmp;
2265
2266 spin_lock_irq(&retry->lock);
2267 list_splice_init(&retry->writes, &writes);
2268 spin_unlock_irq(&retry->lock);
2269
2270 list_for_each_entry_safe(req, tmp, &writes, tl_requests) {
2271 struct drbd_device *device = req->device;
2272 struct bio *bio = req->master_bio;
2273 bool expected;
2274
2275 expected =
2276 expect(atomic_read(&req->completion_ref) == 0) &&
2277 expect(req->rq_state & RQ_POSTPONED) &&
2278 expect((req->rq_state & RQ_LOCAL_PENDING) == 0 ||
2279 (req->rq_state & RQ_LOCAL_ABORTED) != 0);
2280
2281 if (!expected)
2282 drbd_err(device, "req=%p completion_ref=%d rq_state=%x\n",
2283 req, atomic_read(&req->completion_ref),
2284 req->rq_state);
2285
2286
2287
2288
2289
2290
2291 kref_put(&req->kref, drbd_req_destroy);
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306 inc_ap_bio(device);
2307 __drbd_make_request(device, bio);
2308 }
2309}
2310
2311
2312
2313void drbd_restart_request(struct drbd_request *req)
2314{
2315 unsigned long flags;
2316 spin_lock_irqsave(&retry.lock, flags);
2317 list_move_tail(&req->tl_requests, &retry.writes);
2318 spin_unlock_irqrestore(&retry.lock, flags);
2319
2320
2321
2322
2323 dec_ap_bio(req->device);
2324
2325 queue_work(retry.wq, &retry.worker);
2326}
2327
2328void drbd_destroy_resource(struct kref *kref)
2329{
2330 struct drbd_resource *resource =
2331 container_of(kref, struct drbd_resource, kref);
2332
2333 idr_destroy(&resource->devices);
2334 free_cpumask_var(resource->cpu_mask);
2335 kfree(resource->name);
2336 memset(resource, 0xf2, sizeof(*resource));
2337 kfree(resource);
2338}
2339
2340void drbd_free_resource(struct drbd_resource *resource)
2341{
2342 struct drbd_connection *connection, *tmp;
2343
2344 for_each_connection_safe(connection, tmp, resource) {
2345 list_del(&connection->connections);
2346 drbd_debugfs_connection_cleanup(connection);
2347 kref_put(&connection->kref, drbd_destroy_connection);
2348 }
2349 drbd_debugfs_resource_cleanup(resource);
2350 kref_put(&resource->kref, drbd_destroy_resource);
2351}
2352
2353static void drbd_cleanup(void)
2354{
2355 unsigned int i;
2356 struct drbd_device *device;
2357 struct drbd_resource *resource, *tmp;
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367 if (drbd_proc)
2368 remove_proc_entry("drbd", NULL);
2369
2370 if (retry.wq)
2371 destroy_workqueue(retry.wq);
2372
2373 drbd_genl_unregister();
2374
2375 idr_for_each_entry(&drbd_devices, device, i)
2376 drbd_delete_device(device);
2377
2378
2379 for_each_resource_safe(resource, tmp, &drbd_resources) {
2380 list_del(&resource->resources);
2381 drbd_free_resource(resource);
2382 }
2383
2384 drbd_debugfs_cleanup();
2385
2386 drbd_destroy_mempools();
2387 unregister_blkdev(DRBD_MAJOR, "drbd");
2388
2389 idr_destroy(&drbd_devices);
2390
2391 pr_info("module cleanup done.\n");
2392}
2393
2394static void drbd_init_workqueue(struct drbd_work_queue* wq)
2395{
2396 spin_lock_init(&wq->q_lock);
2397 INIT_LIST_HEAD(&wq->q);
2398 init_waitqueue_head(&wq->q_wait);
2399}
2400
2401struct completion_work {
2402 struct drbd_work w;
2403 struct completion done;
2404};
2405
2406static int w_complete(struct drbd_work *w, int cancel)
2407{
2408 struct completion_work *completion_work =
2409 container_of(w, struct completion_work, w);
2410
2411 complete(&completion_work->done);
2412 return 0;
2413}
2414
2415void drbd_flush_workqueue(struct drbd_work_queue *work_queue)
2416{
2417 struct completion_work completion_work;
2418
2419 completion_work.w.cb = w_complete;
2420 init_completion(&completion_work.done);
2421 drbd_queue_work(work_queue, &completion_work.w);
2422 wait_for_completion(&completion_work.done);
2423}
2424
2425struct drbd_resource *drbd_find_resource(const char *name)
2426{
2427 struct drbd_resource *resource;
2428
2429 if (!name || !name[0])
2430 return NULL;
2431
2432 rcu_read_lock();
2433 for_each_resource_rcu(resource, &drbd_resources) {
2434 if (!strcmp(resource->name, name)) {
2435 kref_get(&resource->kref);
2436 goto found;
2437 }
2438 }
2439 resource = NULL;
2440found:
2441 rcu_read_unlock();
2442 return resource;
2443}
2444
2445struct drbd_connection *conn_get_by_addrs(void *my_addr, int my_addr_len,
2446 void *peer_addr, int peer_addr_len)
2447{
2448 struct drbd_resource *resource;
2449 struct drbd_connection *connection;
2450
2451 rcu_read_lock();
2452 for_each_resource_rcu(resource, &drbd_resources) {
2453 for_each_connection_rcu(connection, resource) {
2454 if (connection->my_addr_len == my_addr_len &&
2455 connection->peer_addr_len == peer_addr_len &&
2456 !memcmp(&connection->my_addr, my_addr, my_addr_len) &&
2457 !memcmp(&connection->peer_addr, peer_addr, peer_addr_len)) {
2458 kref_get(&connection->kref);
2459 goto found;
2460 }
2461 }
2462 }
2463 connection = NULL;
2464found:
2465 rcu_read_unlock();
2466 return connection;
2467}
2468
2469static int drbd_alloc_socket(struct drbd_socket *socket)
2470{
2471 socket->rbuf = (void *) __get_free_page(GFP_KERNEL);
2472 if (!socket->rbuf)
2473 return -ENOMEM;
2474 socket->sbuf = (void *) __get_free_page(GFP_KERNEL);
2475 if (!socket->sbuf)
2476 return -ENOMEM;
2477 return 0;
2478}
2479
2480static void drbd_free_socket(struct drbd_socket *socket)
2481{
2482 free_page((unsigned long) socket->sbuf);
2483 free_page((unsigned long) socket->rbuf);
2484}
2485
2486void conn_free_crypto(struct drbd_connection *connection)
2487{
2488 drbd_free_sock(connection);
2489
2490 crypto_free_shash(connection->csums_tfm);
2491 crypto_free_shash(connection->verify_tfm);
2492 crypto_free_shash(connection->cram_hmac_tfm);
2493 crypto_free_shash(connection->integrity_tfm);
2494 crypto_free_shash(connection->peer_integrity_tfm);
2495 kfree(connection->int_dig_in);
2496 kfree(connection->int_dig_vv);
2497
2498 connection->csums_tfm = NULL;
2499 connection->verify_tfm = NULL;
2500 connection->cram_hmac_tfm = NULL;
2501 connection->integrity_tfm = NULL;
2502 connection->peer_integrity_tfm = NULL;
2503 connection->int_dig_in = NULL;
2504 connection->int_dig_vv = NULL;
2505}
2506
2507int set_resource_options(struct drbd_resource *resource, struct res_opts *res_opts)
2508{
2509 struct drbd_connection *connection;
2510 cpumask_var_t new_cpu_mask;
2511 int err;
2512
2513 if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL))
2514 return -ENOMEM;
2515
2516
2517 if (nr_cpu_ids > 1 && res_opts->cpu_mask[0] != 0) {
2518 err = bitmap_parse(res_opts->cpu_mask, DRBD_CPU_MASK_SIZE,
2519 cpumask_bits(new_cpu_mask), nr_cpu_ids);
2520 if (err == -EOVERFLOW) {
2521
2522 cpumask_var_t tmp_cpu_mask;
2523 if (zalloc_cpumask_var(&tmp_cpu_mask, GFP_KERNEL)) {
2524 cpumask_setall(tmp_cpu_mask);
2525 cpumask_and(new_cpu_mask, new_cpu_mask, tmp_cpu_mask);
2526 drbd_warn(resource, "Overflow in bitmap_parse(%.12s%s), truncating to %u bits\n",
2527 res_opts->cpu_mask,
2528 strlen(res_opts->cpu_mask) > 12 ? "..." : "",
2529 nr_cpu_ids);
2530 free_cpumask_var(tmp_cpu_mask);
2531 err = 0;
2532 }
2533 }
2534 if (err) {
2535 drbd_warn(resource, "bitmap_parse() failed with %d\n", err);
2536
2537 goto fail;
2538 }
2539 }
2540 resource->res_opts = *res_opts;
2541 if (cpumask_empty(new_cpu_mask))
2542 drbd_calc_cpu_mask(&new_cpu_mask);
2543 if (!cpumask_equal(resource->cpu_mask, new_cpu_mask)) {
2544 cpumask_copy(resource->cpu_mask, new_cpu_mask);
2545 for_each_connection_rcu(connection, resource) {
2546 connection->receiver.reset_cpu_mask = 1;
2547 connection->ack_receiver.reset_cpu_mask = 1;
2548 connection->worker.reset_cpu_mask = 1;
2549 }
2550 }
2551 err = 0;
2552
2553fail:
2554 free_cpumask_var(new_cpu_mask);
2555 return err;
2556
2557}
2558
2559struct drbd_resource *drbd_create_resource(const char *name)
2560{
2561 struct drbd_resource *resource;
2562
2563 resource = kzalloc(sizeof(struct drbd_resource), GFP_KERNEL);
2564 if (!resource)
2565 goto fail;
2566 resource->name = kstrdup(name, GFP_KERNEL);
2567 if (!resource->name)
2568 goto fail_free_resource;
2569 if (!zalloc_cpumask_var(&resource->cpu_mask, GFP_KERNEL))
2570 goto fail_free_name;
2571 kref_init(&resource->kref);
2572 idr_init(&resource->devices);
2573 INIT_LIST_HEAD(&resource->connections);
2574 resource->write_ordering = WO_BDEV_FLUSH;
2575 list_add_tail_rcu(&resource->resources, &drbd_resources);
2576 mutex_init(&resource->conf_update);
2577 mutex_init(&resource->adm_mutex);
2578 spin_lock_init(&resource->req_lock);
2579 drbd_debugfs_resource_add(resource);
2580 return resource;
2581
2582fail_free_name:
2583 kfree(resource->name);
2584fail_free_resource:
2585 kfree(resource);
2586fail:
2587 return NULL;
2588}
2589
2590
2591struct drbd_connection *conn_create(const char *name, struct res_opts *res_opts)
2592{
2593 struct drbd_resource *resource;
2594 struct drbd_connection *connection;
2595
2596 connection = kzalloc(sizeof(struct drbd_connection), GFP_KERNEL);
2597 if (!connection)
2598 return NULL;
2599
2600 if (drbd_alloc_socket(&connection->data))
2601 goto fail;
2602 if (drbd_alloc_socket(&connection->meta))
2603 goto fail;
2604
2605 connection->current_epoch = kzalloc(sizeof(struct drbd_epoch), GFP_KERNEL);
2606 if (!connection->current_epoch)
2607 goto fail;
2608
2609 INIT_LIST_HEAD(&connection->transfer_log);
2610
2611 INIT_LIST_HEAD(&connection->current_epoch->list);
2612 connection->epochs = 1;
2613 spin_lock_init(&connection->epoch_lock);
2614
2615 connection->send.seen_any_write_yet = false;
2616 connection->send.current_epoch_nr = 0;
2617 connection->send.current_epoch_writes = 0;
2618
2619 resource = drbd_create_resource(name);
2620 if (!resource)
2621 goto fail;
2622
2623 connection->cstate = C_STANDALONE;
2624 mutex_init(&connection->cstate_mutex);
2625 init_waitqueue_head(&connection->ping_wait);
2626 idr_init(&connection->peer_devices);
2627
2628 drbd_init_workqueue(&connection->sender_work);
2629 mutex_init(&connection->data.mutex);
2630 mutex_init(&connection->meta.mutex);
2631
2632 drbd_thread_init(resource, &connection->receiver, drbd_receiver, "receiver");
2633 connection->receiver.connection = connection;
2634 drbd_thread_init(resource, &connection->worker, drbd_worker, "worker");
2635 connection->worker.connection = connection;
2636 drbd_thread_init(resource, &connection->ack_receiver, drbd_ack_receiver, "ack_recv");
2637 connection->ack_receiver.connection = connection;
2638
2639 kref_init(&connection->kref);
2640
2641 connection->resource = resource;
2642
2643 if (set_resource_options(resource, res_opts))
2644 goto fail_resource;
2645
2646 kref_get(&resource->kref);
2647 list_add_tail_rcu(&connection->connections, &resource->connections);
2648 drbd_debugfs_connection_add(connection);
2649 return connection;
2650
2651fail_resource:
2652 list_del(&resource->resources);
2653 drbd_free_resource(resource);
2654fail:
2655 kfree(connection->current_epoch);
2656 drbd_free_socket(&connection->meta);
2657 drbd_free_socket(&connection->data);
2658 kfree(connection);
2659 return NULL;
2660}
2661
2662void drbd_destroy_connection(struct kref *kref)
2663{
2664 struct drbd_connection *connection = container_of(kref, struct drbd_connection, kref);
2665 struct drbd_resource *resource = connection->resource;
2666
2667 if (atomic_read(&connection->current_epoch->epoch_size) != 0)
2668 drbd_err(connection, "epoch_size:%d\n", atomic_read(&connection->current_epoch->epoch_size));
2669 kfree(connection->current_epoch);
2670
2671 idr_destroy(&connection->peer_devices);
2672
2673 drbd_free_socket(&connection->meta);
2674 drbd_free_socket(&connection->data);
2675 kfree(connection->int_dig_in);
2676 kfree(connection->int_dig_vv);
2677 memset(connection, 0xfc, sizeof(*connection));
2678 kfree(connection);
2679 kref_put(&resource->kref, drbd_destroy_resource);
2680}
2681
2682static int init_submitter(struct drbd_device *device)
2683{
2684
2685
2686 device->submit.wq =
2687 alloc_ordered_workqueue("drbd%u_submit", WQ_MEM_RECLAIM, device->minor);
2688 if (!device->submit.wq)
2689 return -ENOMEM;
2690
2691 INIT_WORK(&device->submit.worker, do_submit);
2692 INIT_LIST_HEAD(&device->submit.writes);
2693 return 0;
2694}
2695
2696enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsigned int minor)
2697{
2698 struct drbd_resource *resource = adm_ctx->resource;
2699 struct drbd_connection *connection;
2700 struct drbd_device *device;
2701 struct drbd_peer_device *peer_device, *tmp_peer_device;
2702 struct gendisk *disk;
2703 int id;
2704 int vnr = adm_ctx->volume;
2705 enum drbd_ret_code err = ERR_NOMEM;
2706
2707 device = minor_to_device(minor);
2708 if (device)
2709 return ERR_MINOR_OR_VOLUME_EXISTS;
2710
2711
2712 device = kzalloc(sizeof(struct drbd_device), GFP_KERNEL);
2713 if (!device)
2714 return ERR_NOMEM;
2715 kref_init(&device->kref);
2716
2717 kref_get(&resource->kref);
2718 device->resource = resource;
2719 device->minor = minor;
2720 device->vnr = vnr;
2721
2722 drbd_init_set_defaults(device);
2723
2724 disk = blk_alloc_disk(NUMA_NO_NODE);
2725 if (!disk)
2726 goto out_no_disk;
2727
2728 device->vdisk = disk;
2729 device->rq_queue = disk->queue;
2730
2731 set_disk_ro(disk, true);
2732
2733 disk->major = DRBD_MAJOR;
2734 disk->first_minor = minor;
2735 disk->minors = 1;
2736 disk->fops = &drbd_ops;
2737 sprintf(disk->disk_name, "drbd%d", minor);
2738 disk->private_data = device;
2739
2740 blk_queue_write_cache(disk->queue, true, true);
2741
2742
2743 blk_queue_max_hw_sectors(disk->queue, DRBD_MAX_BIO_SIZE_SAFE >> 8);
2744
2745 device->md_io.page = alloc_page(GFP_KERNEL);
2746 if (!device->md_io.page)
2747 goto out_no_io_page;
2748
2749 if (drbd_bm_init(device))
2750 goto out_no_bitmap;
2751 device->read_requests = RB_ROOT;
2752 device->write_requests = RB_ROOT;
2753
2754 id = idr_alloc(&drbd_devices, device, minor, minor + 1, GFP_KERNEL);
2755 if (id < 0) {
2756 if (id == -ENOSPC)
2757 err = ERR_MINOR_OR_VOLUME_EXISTS;
2758 goto out_no_minor_idr;
2759 }
2760 kref_get(&device->kref);
2761
2762 id = idr_alloc(&resource->devices, device, vnr, vnr + 1, GFP_KERNEL);
2763 if (id < 0) {
2764 if (id == -ENOSPC)
2765 err = ERR_MINOR_OR_VOLUME_EXISTS;
2766 goto out_idr_remove_minor;
2767 }
2768 kref_get(&device->kref);
2769
2770 INIT_LIST_HEAD(&device->peer_devices);
2771 INIT_LIST_HEAD(&device->pending_bitmap_io);
2772 for_each_connection(connection, resource) {
2773 peer_device = kzalloc(sizeof(struct drbd_peer_device), GFP_KERNEL);
2774 if (!peer_device)
2775 goto out_idr_remove_from_resource;
2776 peer_device->connection = connection;
2777 peer_device->device = device;
2778
2779 list_add(&peer_device->peer_devices, &device->peer_devices);
2780 kref_get(&device->kref);
2781
2782 id = idr_alloc(&connection->peer_devices, peer_device, vnr, vnr + 1, GFP_KERNEL);
2783 if (id < 0) {
2784 if (id == -ENOSPC)
2785 err = ERR_INVALID_REQUEST;
2786 goto out_idr_remove_from_resource;
2787 }
2788 kref_get(&connection->kref);
2789 INIT_WORK(&peer_device->send_acks_work, drbd_send_acks_wf);
2790 }
2791
2792 if (init_submitter(device)) {
2793 err = ERR_NOMEM;
2794 goto out_idr_remove_vol;
2795 }
2796
2797 add_disk(disk);
2798
2799
2800 device->state.conn = first_connection(resource)->cstate;
2801 if (device->state.conn == C_WF_REPORT_PARAMS) {
2802 for_each_peer_device(peer_device, device)
2803 drbd_connected(peer_device);
2804 }
2805
2806 for_each_peer_device(peer_device, device)
2807 drbd_debugfs_peer_device_add(peer_device);
2808 drbd_debugfs_device_add(device);
2809 return NO_ERROR;
2810
2811out_idr_remove_vol:
2812 idr_remove(&connection->peer_devices, vnr);
2813out_idr_remove_from_resource:
2814 for_each_connection(connection, resource) {
2815 peer_device = idr_remove(&connection->peer_devices, vnr);
2816 if (peer_device)
2817 kref_put(&connection->kref, drbd_destroy_connection);
2818 }
2819 for_each_peer_device_safe(peer_device, tmp_peer_device, device) {
2820 list_del(&peer_device->peer_devices);
2821 kfree(peer_device);
2822 }
2823 idr_remove(&resource->devices, vnr);
2824out_idr_remove_minor:
2825 idr_remove(&drbd_devices, minor);
2826 synchronize_rcu();
2827out_no_minor_idr:
2828 drbd_bm_cleanup(device);
2829out_no_bitmap:
2830 __free_page(device->md_io.page);
2831out_no_io_page:
2832 blk_cleanup_disk(disk);
2833out_no_disk:
2834 kref_put(&resource->kref, drbd_destroy_resource);
2835 kfree(device);
2836 return err;
2837}
2838
2839void drbd_delete_device(struct drbd_device *device)
2840{
2841 struct drbd_resource *resource = device->resource;
2842 struct drbd_connection *connection;
2843 struct drbd_peer_device *peer_device;
2844
2845
2846 for_each_peer_device(peer_device, device)
2847 drbd_debugfs_peer_device_cleanup(peer_device);
2848 drbd_debugfs_device_cleanup(device);
2849 for_each_connection(connection, resource) {
2850 idr_remove(&connection->peer_devices, device->vnr);
2851 kref_put(&device->kref, drbd_destroy_device);
2852 }
2853 idr_remove(&resource->devices, device->vnr);
2854 kref_put(&device->kref, drbd_destroy_device);
2855 idr_remove(&drbd_devices, device_to_minor(device));
2856 kref_put(&device->kref, drbd_destroy_device);
2857 del_gendisk(device->vdisk);
2858 synchronize_rcu();
2859 kref_put(&device->kref, drbd_destroy_device);
2860}
2861
2862static int __init drbd_init(void)
2863{
2864 int err;
2865
2866 if (drbd_minor_count < DRBD_MINOR_COUNT_MIN || drbd_minor_count > DRBD_MINOR_COUNT_MAX) {
2867 pr_err("invalid minor_count (%d)\n", drbd_minor_count);
2868#ifdef MODULE
2869 return -EINVAL;
2870#else
2871 drbd_minor_count = DRBD_MINOR_COUNT_DEF;
2872#endif
2873 }
2874
2875 err = register_blkdev(DRBD_MAJOR, "drbd");
2876 if (err) {
2877 pr_err("unable to register block device major %d\n",
2878 DRBD_MAJOR);
2879 return err;
2880 }
2881
2882
2883
2884
2885 init_waitqueue_head(&drbd_pp_wait);
2886
2887 drbd_proc = NULL;
2888 idr_init(&drbd_devices);
2889
2890 mutex_init(&resources_mutex);
2891 INIT_LIST_HEAD(&drbd_resources);
2892
2893 err = drbd_genl_register();
2894 if (err) {
2895 pr_err("unable to register generic netlink family\n");
2896 goto fail;
2897 }
2898
2899 err = drbd_create_mempools();
2900 if (err)
2901 goto fail;
2902
2903 err = -ENOMEM;
2904 drbd_proc = proc_create_single("drbd", S_IFREG | 0444 , NULL, drbd_seq_show);
2905 if (!drbd_proc) {
2906 pr_err("unable to register proc file\n");
2907 goto fail;
2908 }
2909
2910 retry.wq = create_singlethread_workqueue("drbd-reissue");
2911 if (!retry.wq) {
2912 pr_err("unable to create retry workqueue\n");
2913 goto fail;
2914 }
2915 INIT_WORK(&retry.worker, do_retry);
2916 spin_lock_init(&retry.lock);
2917 INIT_LIST_HEAD(&retry.writes);
2918
2919 drbd_debugfs_init();
2920
2921 pr_info("initialized. "
2922 "Version: " REL_VERSION " (api:%d/proto:%d-%d)\n",
2923 API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX);
2924 pr_info("%s\n", drbd_buildtag());
2925 pr_info("registered as block device major %d\n", DRBD_MAJOR);
2926 return 0;
2927
2928fail:
2929 drbd_cleanup();
2930 if (err == -ENOMEM)
2931 pr_err("ran out of memory\n");
2932 else
2933 pr_err("initialization failure\n");
2934 return err;
2935}
2936
2937static void drbd_free_one_sock(struct drbd_socket *ds)
2938{
2939 struct socket *s;
2940 mutex_lock(&ds->mutex);
2941 s = ds->socket;
2942 ds->socket = NULL;
2943 mutex_unlock(&ds->mutex);
2944 if (s) {
2945
2946 synchronize_rcu();
2947 kernel_sock_shutdown(s, SHUT_RDWR);
2948 sock_release(s);
2949 }
2950}
2951
2952void drbd_free_sock(struct drbd_connection *connection)
2953{
2954 if (connection->data.socket)
2955 drbd_free_one_sock(&connection->data);
2956 if (connection->meta.socket)
2957 drbd_free_one_sock(&connection->meta);
2958}
2959
2960
2961
2962void conn_md_sync(struct drbd_connection *connection)
2963{
2964 struct drbd_peer_device *peer_device;
2965 int vnr;
2966
2967 rcu_read_lock();
2968 idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
2969 struct drbd_device *device = peer_device->device;
2970
2971 kref_get(&device->kref);
2972 rcu_read_unlock();
2973 drbd_md_sync(device);
2974 kref_put(&device->kref, drbd_destroy_device);
2975 rcu_read_lock();
2976 }
2977 rcu_read_unlock();
2978}
2979
2980
2981struct meta_data_on_disk {
2982 u64 la_size_sect;
2983 u64 uuid[UI_SIZE];
2984 u64 device_uuid;
2985 u64 reserved_u64_1;
2986 u32 flags;
2987 u32 magic;
2988 u32 md_size_sect;
2989 u32 al_offset;
2990 u32 al_nr_extents;
2991
2992 u32 bm_offset;
2993 u32 bm_bytes_per_bit;
2994 u32 la_peer_max_bio_size;
2995
2996
2997 u32 al_stripes;
2998 u32 al_stripe_size_4k;
2999
3000 u8 reserved_u8[4096 - (7*8 + 10*4)];
3001} __packed;
3002
3003
3004
3005void drbd_md_write(struct drbd_device *device, void *b)
3006{
3007 struct meta_data_on_disk *buffer = b;
3008 sector_t sector;
3009 int i;
3010
3011 memset(buffer, 0, sizeof(*buffer));
3012
3013 buffer->la_size_sect = cpu_to_be64(get_capacity(device->vdisk));
3014 for (i = UI_CURRENT; i < UI_SIZE; i++)
3015 buffer->uuid[i] = cpu_to_be64(device->ldev->md.uuid[i]);
3016 buffer->flags = cpu_to_be32(device->ldev->md.flags);
3017 buffer->magic = cpu_to_be32(DRBD_MD_MAGIC_84_UNCLEAN);
3018
3019 buffer->md_size_sect = cpu_to_be32(device->ldev->md.md_size_sect);
3020 buffer->al_offset = cpu_to_be32(device->ldev->md.al_offset);
3021 buffer->al_nr_extents = cpu_to_be32(device->act_log->nr_elements);
3022 buffer->bm_bytes_per_bit = cpu_to_be32(BM_BLOCK_SIZE);
3023 buffer->device_uuid = cpu_to_be64(device->ldev->md.device_uuid);
3024
3025 buffer->bm_offset = cpu_to_be32(device->ldev->md.bm_offset);
3026 buffer->la_peer_max_bio_size = cpu_to_be32(device->peer_max_bio_size);
3027
3028 buffer->al_stripes = cpu_to_be32(device->ldev->md.al_stripes);
3029 buffer->al_stripe_size_4k = cpu_to_be32(device->ldev->md.al_stripe_size_4k);
3030
3031 D_ASSERT(device, drbd_md_ss(device->ldev) == device->ldev->md.md_offset);
3032 sector = device->ldev->md.md_offset;
3033
3034 if (drbd_md_sync_page_io(device, device->ldev, sector, REQ_OP_WRITE)) {
3035
3036 drbd_err(device, "meta data update failed!\n");
3037 drbd_chk_io_error(device, 1, DRBD_META_IO_ERROR);
3038 }
3039}
3040
3041
3042
3043
3044
3045void drbd_md_sync(struct drbd_device *device)
3046{
3047 struct meta_data_on_disk *buffer;
3048
3049
3050 BUILD_BUG_ON(UI_SIZE != 4);
3051 BUILD_BUG_ON(sizeof(struct meta_data_on_disk) != 4096);
3052
3053 del_timer(&device->md_sync_timer);
3054
3055 if (!test_and_clear_bit(MD_DIRTY, &device->flags))
3056 return;
3057
3058
3059
3060 if (!get_ldev_if_state(device, D_FAILED))
3061 return;
3062
3063 buffer = drbd_md_get_buffer(device, __func__);
3064 if (!buffer)
3065 goto out;
3066
3067 drbd_md_write(device, buffer);
3068
3069
3070
3071 device->ldev->md.la_size_sect = get_capacity(device->vdisk);
3072
3073 drbd_md_put_buffer(device);
3074out:
3075 put_ldev(device);
3076}
3077
3078static int check_activity_log_stripe_size(struct drbd_device *device,
3079 struct meta_data_on_disk *on_disk,
3080 struct drbd_md *in_core)
3081{
3082 u32 al_stripes = be32_to_cpu(on_disk->al_stripes);
3083 u32 al_stripe_size_4k = be32_to_cpu(on_disk->al_stripe_size_4k);
3084 u64 al_size_4k;
3085
3086
3087 if (al_stripes == 0 && al_stripe_size_4k == 0) {
3088 al_stripes = 1;
3089 al_stripe_size_4k = MD_32kB_SECT/8;
3090 }
3091
3092
3093
3094
3095 if (al_stripes == 0 || al_stripe_size_4k == 0)
3096 goto err;
3097
3098 al_size_4k = (u64)al_stripes * al_stripe_size_4k;
3099
3100
3101
3102
3103
3104 if (al_size_4k > (16 * 1024 * 1024/4))
3105 goto err;
3106
3107
3108
3109 if (al_size_4k < MD_32kB_SECT/8)
3110 goto err;
3111
3112 in_core->al_stripe_size_4k = al_stripe_size_4k;
3113 in_core->al_stripes = al_stripes;
3114 in_core->al_size_4k = al_size_4k;
3115
3116 return 0;
3117err:
3118 drbd_err(device, "invalid activity log striping: al_stripes=%u, al_stripe_size_4k=%u\n",
3119 al_stripes, al_stripe_size_4k);
3120 return -EINVAL;
3121}
3122
3123static int check_offsets_and_sizes(struct drbd_device *device, struct drbd_backing_dev *bdev)
3124{
3125 sector_t capacity = drbd_get_capacity(bdev->md_bdev);
3126 struct drbd_md *in_core = &bdev->md;
3127 s32 on_disk_al_sect;
3128 s32 on_disk_bm_sect;
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138 if (in_core->al_offset < 0) {
3139 if (in_core->bm_offset > in_core->al_offset)
3140 goto err;
3141 on_disk_al_sect = -in_core->al_offset;
3142 on_disk_bm_sect = in_core->al_offset - in_core->bm_offset;
3143 } else {
3144 if (in_core->al_offset != MD_4kB_SECT)
3145 goto err;
3146 if (in_core->bm_offset < in_core->al_offset + in_core->al_size_4k * MD_4kB_SECT)
3147 goto err;
3148
3149 on_disk_al_sect = in_core->bm_offset - MD_4kB_SECT;
3150 on_disk_bm_sect = in_core->md_size_sect - in_core->bm_offset;
3151 }
3152
3153
3154 if (in_core->meta_dev_idx >= 0) {
3155 if (in_core->md_size_sect != MD_128MB_SECT
3156 || in_core->al_offset != MD_4kB_SECT
3157 || in_core->bm_offset != MD_4kB_SECT + MD_32kB_SECT
3158 || in_core->al_stripes != 1
3159 || in_core->al_stripe_size_4k != MD_32kB_SECT/8)
3160 goto err;
3161 }
3162
3163 if (capacity < in_core->md_size_sect)
3164 goto err;
3165 if (capacity - in_core->md_size_sect < drbd_md_first_sector(bdev))
3166 goto err;
3167
3168
3169 if ((on_disk_al_sect & 7) || (on_disk_al_sect < MD_32kB_SECT))
3170 goto err;
3171
3172
3173
3174 if (on_disk_al_sect != in_core->al_size_4k * MD_4kB_SECT)
3175 goto err;
3176
3177
3178 if (in_core->bm_offset & 7)
3179 goto err;
3180
3181
3182
3183
3184 if (on_disk_bm_sect < (in_core->la_size_sect+7)/MD_4kB_SECT/8/512)
3185 goto err;
3186
3187 return 0;
3188
3189err:
3190 drbd_err(device, "meta data offsets don't make sense: idx=%d "
3191 "al_s=%u, al_sz4k=%u, al_offset=%d, bm_offset=%d, "
3192 "md_size_sect=%u, la_size=%llu, md_capacity=%llu\n",
3193 in_core->meta_dev_idx,
3194 in_core->al_stripes, in_core->al_stripe_size_4k,
3195 in_core->al_offset, in_core->bm_offset, in_core->md_size_sect,
3196 (unsigned long long)in_core->la_size_sect,
3197 (unsigned long long)capacity);
3198
3199 return -EINVAL;
3200}
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214int drbd_md_read(struct drbd_device *device, struct drbd_backing_dev *bdev)
3215{
3216 struct meta_data_on_disk *buffer;
3217 u32 magic, flags;
3218 int i, rv = NO_ERROR;
3219
3220 if (device->state.disk != D_DISKLESS)
3221 return ERR_DISK_CONFIGURED;
3222
3223 buffer = drbd_md_get_buffer(device, __func__);
3224 if (!buffer)
3225 return ERR_NOMEM;
3226
3227
3228
3229 bdev->md.meta_dev_idx = bdev->disk_conf->meta_dev_idx;
3230 bdev->md.md_offset = drbd_md_ss(bdev);
3231
3232
3233
3234 bdev->md.md_size_sect = 8;
3235
3236 if (drbd_md_sync_page_io(device, bdev, bdev->md.md_offset,
3237 REQ_OP_READ)) {
3238
3239
3240 drbd_err(device, "Error while reading metadata.\n");
3241 rv = ERR_IO_MD_DISK;
3242 goto err;
3243 }
3244
3245 magic = be32_to_cpu(buffer->magic);
3246 flags = be32_to_cpu(buffer->flags);
3247 if (magic == DRBD_MD_MAGIC_84_UNCLEAN ||
3248 (magic == DRBD_MD_MAGIC_08 && !(flags & MDF_AL_CLEAN))) {
3249
3250 drbd_err(device, "Found unclean meta data. Did you \"drbdadm apply-al\"?\n");
3251 rv = ERR_MD_UNCLEAN;
3252 goto err;
3253 }
3254
3255 rv = ERR_MD_INVALID;
3256 if (magic != DRBD_MD_MAGIC_08) {
3257 if (magic == DRBD_MD_MAGIC_07)
3258 drbd_err(device, "Found old (0.7) meta data magic. Did you \"drbdadm create-md\"?\n");
3259 else
3260 drbd_err(device, "Meta data magic not found. Did you \"drbdadm create-md\"?\n");
3261 goto err;
3262 }
3263
3264 if (be32_to_cpu(buffer->bm_bytes_per_bit) != BM_BLOCK_SIZE) {
3265 drbd_err(device, "unexpected bm_bytes_per_bit: %u (expected %u)\n",
3266 be32_to_cpu(buffer->bm_bytes_per_bit), BM_BLOCK_SIZE);
3267 goto err;
3268 }
3269
3270
3271
3272 bdev->md.la_size_sect = be64_to_cpu(buffer->la_size_sect);
3273 for (i = UI_CURRENT; i < UI_SIZE; i++)
3274 bdev->md.uuid[i] = be64_to_cpu(buffer->uuid[i]);
3275 bdev->md.flags = be32_to_cpu(buffer->flags);
3276 bdev->md.device_uuid = be64_to_cpu(buffer->device_uuid);
3277
3278 bdev->md.md_size_sect = be32_to_cpu(buffer->md_size_sect);
3279 bdev->md.al_offset = be32_to_cpu(buffer->al_offset);
3280 bdev->md.bm_offset = be32_to_cpu(buffer->bm_offset);
3281
3282 if (check_activity_log_stripe_size(device, buffer, &bdev->md))
3283 goto err;
3284 if (check_offsets_and_sizes(device, bdev))
3285 goto err;
3286
3287 if (be32_to_cpu(buffer->bm_offset) != bdev->md.bm_offset) {
3288 drbd_err(device, "unexpected bm_offset: %d (expected %d)\n",
3289 be32_to_cpu(buffer->bm_offset), bdev->md.bm_offset);
3290 goto err;
3291 }
3292 if (be32_to_cpu(buffer->md_size_sect) != bdev->md.md_size_sect) {
3293 drbd_err(device, "unexpected md_size: %u (expected %u)\n",
3294 be32_to_cpu(buffer->md_size_sect), bdev->md.md_size_sect);
3295 goto err;
3296 }
3297
3298 rv = NO_ERROR;
3299
3300 spin_lock_irq(&device->resource->req_lock);
3301 if (device->state.conn < C_CONNECTED) {
3302 unsigned int peer;
3303 peer = be32_to_cpu(buffer->la_peer_max_bio_size);
3304 peer = max(peer, DRBD_MAX_BIO_SIZE_SAFE);
3305 device->peer_max_bio_size = peer;
3306 }
3307 spin_unlock_irq(&device->resource->req_lock);
3308
3309 err:
3310 drbd_md_put_buffer(device);
3311
3312 return rv;
3313}
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323void drbd_md_mark_dirty(struct drbd_device *device)
3324{
3325 if (!test_and_set_bit(MD_DIRTY, &device->flags))
3326 mod_timer(&device->md_sync_timer, jiffies + 5*HZ);
3327}
3328
3329void drbd_uuid_move_history(struct drbd_device *device) __must_hold(local)
3330{
3331 int i;
3332
3333 for (i = UI_HISTORY_START; i < UI_HISTORY_END; i++)
3334 device->ldev->md.uuid[i+1] = device->ldev->md.uuid[i];
3335}
3336
3337void __drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local)
3338{
3339 if (idx == UI_CURRENT) {
3340 if (device->state.role == R_PRIMARY)
3341 val |= 1;
3342 else
3343 val &= ~((u64)1);
3344
3345 drbd_set_ed_uuid(device, val);
3346 }
3347
3348 device->ldev->md.uuid[idx] = val;
3349 drbd_md_mark_dirty(device);
3350}
3351
3352void _drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local)
3353{
3354 unsigned long flags;
3355 spin_lock_irqsave(&device->ldev->md.uuid_lock, flags);
3356 __drbd_uuid_set(device, idx, val);
3357 spin_unlock_irqrestore(&device->ldev->md.uuid_lock, flags);
3358}
3359
3360void drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local)
3361{
3362 unsigned long flags;
3363 spin_lock_irqsave(&device->ldev->md.uuid_lock, flags);
3364 if (device->ldev->md.uuid[idx]) {
3365 drbd_uuid_move_history(device);
3366 device->ldev->md.uuid[UI_HISTORY_START] = device->ldev->md.uuid[idx];
3367 }
3368 __drbd_uuid_set(device, idx, val);
3369 spin_unlock_irqrestore(&device->ldev->md.uuid_lock, flags);
3370}
3371
3372
3373
3374
3375
3376
3377
3378
3379void drbd_uuid_new_current(struct drbd_device *device) __must_hold(local)
3380{
3381 u64 val;
3382 unsigned long long bm_uuid;
3383
3384 get_random_bytes(&val, sizeof(u64));
3385
3386 spin_lock_irq(&device->ldev->md.uuid_lock);
3387 bm_uuid = device->ldev->md.uuid[UI_BITMAP];
3388
3389 if (bm_uuid)
3390 drbd_warn(device, "bm UUID was already set: %llX\n", bm_uuid);
3391
3392 device->ldev->md.uuid[UI_BITMAP] = device->ldev->md.uuid[UI_CURRENT];
3393 __drbd_uuid_set(device, UI_CURRENT, val);
3394 spin_unlock_irq(&device->ldev->md.uuid_lock);
3395
3396 drbd_print_uuids(device, "new current UUID");
3397
3398 drbd_md_sync(device);
3399}
3400
3401void drbd_uuid_set_bm(struct drbd_device *device, u64 val) __must_hold(local)
3402{
3403 unsigned long flags;
3404 if (device->ldev->md.uuid[UI_BITMAP] == 0 && val == 0)
3405 return;
3406
3407 spin_lock_irqsave(&device->ldev->md.uuid_lock, flags);
3408 if (val == 0) {
3409 drbd_uuid_move_history(device);
3410 device->ldev->md.uuid[UI_HISTORY_START] = device->ldev->md.uuid[UI_BITMAP];
3411 device->ldev->md.uuid[UI_BITMAP] = 0;
3412 } else {
3413 unsigned long long bm_uuid = device->ldev->md.uuid[UI_BITMAP];
3414 if (bm_uuid)
3415 drbd_warn(device, "bm UUID was already set: %llX\n", bm_uuid);
3416
3417 device->ldev->md.uuid[UI_BITMAP] = val & ~((u64)1);
3418 }
3419 spin_unlock_irqrestore(&device->ldev->md.uuid_lock, flags);
3420
3421 drbd_md_mark_dirty(device);
3422}
3423
3424
3425
3426
3427
3428
3429
3430int drbd_bmio_set_n_write(struct drbd_device *device) __must_hold(local)
3431{
3432 int rv = -EIO;
3433
3434 drbd_md_set_flag(device, MDF_FULL_SYNC);
3435 drbd_md_sync(device);
3436 drbd_bm_set_all(device);
3437
3438 rv = drbd_bm_write(device);
3439
3440 if (!rv) {
3441 drbd_md_clear_flag(device, MDF_FULL_SYNC);
3442 drbd_md_sync(device);
3443 }
3444
3445 return rv;
3446}
3447
3448
3449
3450
3451
3452
3453
3454int drbd_bmio_clear_n_write(struct drbd_device *device) __must_hold(local)
3455{
3456 drbd_resume_al(device);
3457 drbd_bm_clear_all(device);
3458 return drbd_bm_write(device);
3459}
3460
3461static int w_bitmap_io(struct drbd_work *w, int unused)
3462{
3463 struct drbd_device *device =
3464 container_of(w, struct drbd_device, bm_io_work.w);
3465 struct bm_io_work *work = &device->bm_io_work;
3466 int rv = -EIO;
3467
3468 if (work->flags != BM_LOCKED_CHANGE_ALLOWED) {
3469 int cnt = atomic_read(&device->ap_bio_cnt);
3470 if (cnt)
3471 drbd_err(device, "FIXME: ap_bio_cnt %d, expected 0; queued for '%s'\n",
3472 cnt, work->why);
3473 }
3474
3475 if (get_ldev(device)) {
3476 drbd_bm_lock(device, work->why, work->flags);
3477 rv = work->io_fn(device);
3478 drbd_bm_unlock(device);
3479 put_ldev(device);
3480 }
3481
3482 clear_bit_unlock(BITMAP_IO, &device->flags);
3483 wake_up(&device->misc_wait);
3484
3485 if (work->done)
3486 work->done(device, rv);
3487
3488 clear_bit(BITMAP_IO_QUEUED, &device->flags);
3489 work->why = NULL;
3490 work->flags = 0;
3491
3492 return 0;
3493}
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511void drbd_queue_bitmap_io(struct drbd_device *device,
3512 int (*io_fn)(struct drbd_device *),
3513 void (*done)(struct drbd_device *, int),
3514 char *why, enum bm_flag flags)
3515{
3516 D_ASSERT(device, current == first_peer_device(device)->connection->worker.task);
3517
3518 D_ASSERT(device, !test_bit(BITMAP_IO_QUEUED, &device->flags));
3519 D_ASSERT(device, !test_bit(BITMAP_IO, &device->flags));
3520 D_ASSERT(device, list_empty(&device->bm_io_work.w.list));
3521 if (device->bm_io_work.why)
3522 drbd_err(device, "FIXME going to queue '%s' but '%s' still pending?\n",
3523 why, device->bm_io_work.why);
3524
3525 device->bm_io_work.io_fn = io_fn;
3526 device->bm_io_work.done = done;
3527 device->bm_io_work.why = why;
3528 device->bm_io_work.flags = flags;
3529
3530 spin_lock_irq(&device->resource->req_lock);
3531 set_bit(BITMAP_IO, &device->flags);
3532
3533
3534 if (flags == BM_LOCKED_CHANGE_ALLOWED || atomic_read(&device->ap_bio_cnt) == 0) {
3535 if (!test_and_set_bit(BITMAP_IO_QUEUED, &device->flags))
3536 drbd_queue_work(&first_peer_device(device)->connection->sender_work,
3537 &device->bm_io_work.w);
3538 }
3539 spin_unlock_irq(&device->resource->req_lock);
3540}
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552int drbd_bitmap_io(struct drbd_device *device, int (*io_fn)(struct drbd_device *),
3553 char *why, enum bm_flag flags)
3554{
3555
3556 const bool do_suspend_io = flags & (BM_DONT_CLEAR|BM_DONT_SET|BM_DONT_TEST);
3557 int rv;
3558
3559 D_ASSERT(device, current != first_peer_device(device)->connection->worker.task);
3560
3561 if (do_suspend_io)
3562 drbd_suspend_io(device);
3563
3564 drbd_bm_lock(device, why, flags);
3565 rv = io_fn(device);
3566 drbd_bm_unlock(device);
3567
3568 if (do_suspend_io)
3569 drbd_resume_io(device);
3570
3571 return rv;
3572}
3573
3574void drbd_md_set_flag(struct drbd_device *device, int flag) __must_hold(local)
3575{
3576 if ((device->ldev->md.flags & flag) != flag) {
3577 drbd_md_mark_dirty(device);
3578 device->ldev->md.flags |= flag;
3579 }
3580}
3581
3582void drbd_md_clear_flag(struct drbd_device *device, int flag) __must_hold(local)
3583{
3584 if ((device->ldev->md.flags & flag) != 0) {
3585 drbd_md_mark_dirty(device);
3586 device->ldev->md.flags &= ~flag;
3587 }
3588}
3589int drbd_md_test_flag(struct drbd_backing_dev *bdev, int flag)
3590{
3591 return (bdev->md.flags & flag) != 0;
3592}
3593
3594static void md_sync_timer_fn(struct timer_list *t)
3595{
3596 struct drbd_device *device = from_timer(device, t, md_sync_timer);
3597 drbd_device_post_work(device, MD_SYNC);
3598}
3599
3600const char *cmdname(enum drbd_packet cmd)
3601{
3602
3603
3604
3605 static const char *cmdnames[] = {
3606 [P_DATA] = "Data",
3607 [P_WSAME] = "WriteSame",
3608 [P_TRIM] = "Trim",
3609 [P_DATA_REPLY] = "DataReply",
3610 [P_RS_DATA_REPLY] = "RSDataReply",
3611 [P_BARRIER] = "Barrier",
3612 [P_BITMAP] = "ReportBitMap",
3613 [P_BECOME_SYNC_TARGET] = "BecomeSyncTarget",
3614 [P_BECOME_SYNC_SOURCE] = "BecomeSyncSource",
3615 [P_UNPLUG_REMOTE] = "UnplugRemote",
3616 [P_DATA_REQUEST] = "DataRequest",
3617 [P_RS_DATA_REQUEST] = "RSDataRequest",
3618 [P_SYNC_PARAM] = "SyncParam",
3619 [P_SYNC_PARAM89] = "SyncParam89",
3620 [P_PROTOCOL] = "ReportProtocol",
3621 [P_UUIDS] = "ReportUUIDs",
3622 [P_SIZES] = "ReportSizes",
3623 [P_STATE] = "ReportState",
3624 [P_SYNC_UUID] = "ReportSyncUUID",
3625 [P_AUTH_CHALLENGE] = "AuthChallenge",
3626 [P_AUTH_RESPONSE] = "AuthResponse",
3627 [P_PING] = "Ping",
3628 [P_PING_ACK] = "PingAck",
3629 [P_RECV_ACK] = "RecvAck",
3630 [P_WRITE_ACK] = "WriteAck",
3631 [P_RS_WRITE_ACK] = "RSWriteAck",
3632 [P_SUPERSEDED] = "Superseded",
3633 [P_NEG_ACK] = "NegAck",
3634 [P_NEG_DREPLY] = "NegDReply",
3635 [P_NEG_RS_DREPLY] = "NegRSDReply",
3636 [P_BARRIER_ACK] = "BarrierAck",
3637 [P_STATE_CHG_REQ] = "StateChgRequest",
3638 [P_STATE_CHG_REPLY] = "StateChgReply",
3639 [P_OV_REQUEST] = "OVRequest",
3640 [P_OV_REPLY] = "OVReply",
3641 [P_OV_RESULT] = "OVResult",
3642 [P_CSUM_RS_REQUEST] = "CsumRSRequest",
3643 [P_RS_IS_IN_SYNC] = "CsumRSIsInSync",
3644 [P_COMPRESSED_BITMAP] = "CBitmap",
3645 [P_DELAY_PROBE] = "DelayProbe",
3646 [P_OUT_OF_SYNC] = "OutOfSync",
3647 [P_RETRY_WRITE] = "RetryWrite",
3648 [P_RS_CANCEL] = "RSCancel",
3649 [P_CONN_ST_CHG_REQ] = "conn_st_chg_req",
3650 [P_CONN_ST_CHG_REPLY] = "conn_st_chg_reply",
3651 [P_PROTOCOL_UPDATE] = "protocol_update",
3652 [P_RS_THIN_REQ] = "rs_thin_req",
3653 [P_RS_DEALLOCATED] = "rs_deallocated",
3654
3655
3656
3657
3658
3659 };
3660
3661
3662 if (cmd == P_INITIAL_META)
3663 return "InitialMeta";
3664 if (cmd == P_INITIAL_DATA)
3665 return "InitialData";
3666 if (cmd == P_CONNECTION_FEATURES)
3667 return "ConnectionFeatures";
3668 if (cmd >= ARRAY_SIZE(cmdnames))
3669 return "Unknown";
3670 return cmdnames[cmd];
3671}
3672
3673
3674
3675
3676
3677
3678
3679int drbd_wait_misc(struct drbd_device *device, struct drbd_interval *i)
3680{
3681 struct net_conf *nc;
3682 DEFINE_WAIT(wait);
3683 long timeout;
3684
3685 rcu_read_lock();
3686 nc = rcu_dereference(first_peer_device(device)->connection->net_conf);
3687 if (!nc) {
3688 rcu_read_unlock();
3689 return -ETIMEDOUT;
3690 }
3691 timeout = nc->ko_count ? nc->timeout * HZ / 10 * nc->ko_count : MAX_SCHEDULE_TIMEOUT;
3692 rcu_read_unlock();
3693
3694
3695 i->waiting = true;
3696 prepare_to_wait(&device->misc_wait, &wait, TASK_INTERRUPTIBLE);
3697 spin_unlock_irq(&device->resource->req_lock);
3698 timeout = schedule_timeout(timeout);
3699 finish_wait(&device->misc_wait, &wait);
3700 spin_lock_irq(&device->resource->req_lock);
3701 if (!timeout || device->state.conn < C_CONNECTED)
3702 return -ETIMEDOUT;
3703 if (signal_pending(current))
3704 return -ERESTARTSYS;
3705 return 0;
3706}
3707
3708void lock_all_resources(void)
3709{
3710 struct drbd_resource *resource;
3711 int __maybe_unused i = 0;
3712
3713 mutex_lock(&resources_mutex);
3714 local_irq_disable();
3715 for_each_resource(resource, &drbd_resources)
3716 spin_lock_nested(&resource->req_lock, i++);
3717}
3718
3719void unlock_all_resources(void)
3720{
3721 struct drbd_resource *resource;
3722
3723 for_each_resource(resource, &drbd_resources)
3724 spin_unlock(&resource->req_lock);
3725 local_irq_enable();
3726 mutex_unlock(&resources_mutex);
3727}
3728
3729#ifdef CONFIG_DRBD_FAULT_INJECTION
3730
3731
3732struct fault_random_state {
3733 unsigned long state;
3734 unsigned long count;
3735};
3736
3737#define FAULT_RANDOM_MULT 39916801
3738#define FAULT_RANDOM_ADD 479001701
3739#define FAULT_RANDOM_REFRESH 10000
3740
3741
3742
3743
3744
3745static unsigned long
3746_drbd_fault_random(struct fault_random_state *rsp)
3747{
3748 long refresh;
3749
3750 if (!rsp->count--) {
3751 get_random_bytes(&refresh, sizeof(refresh));
3752 rsp->state += refresh;
3753 rsp->count = FAULT_RANDOM_REFRESH;
3754 }
3755 rsp->state = rsp->state * FAULT_RANDOM_MULT + FAULT_RANDOM_ADD;
3756 return swahw32(rsp->state);
3757}
3758
3759static char *
3760_drbd_fault_str(unsigned int type) {
3761 static char *_faults[] = {
3762 [DRBD_FAULT_MD_WR] = "Meta-data write",
3763 [DRBD_FAULT_MD_RD] = "Meta-data read",
3764 [DRBD_FAULT_RS_WR] = "Resync write",
3765 [DRBD_FAULT_RS_RD] = "Resync read",
3766 [DRBD_FAULT_DT_WR] = "Data write",
3767 [DRBD_FAULT_DT_RD] = "Data read",
3768 [DRBD_FAULT_DT_RA] = "Data read ahead",
3769 [DRBD_FAULT_BM_ALLOC] = "BM allocation",
3770 [DRBD_FAULT_AL_EE] = "EE allocation",
3771 [DRBD_FAULT_RECEIVE] = "receive data corruption",
3772 };
3773
3774 return (type < DRBD_FAULT_MAX) ? _faults[type] : "**Unknown**";
3775}
3776
3777unsigned int
3778_drbd_insert_fault(struct drbd_device *device, unsigned int type)
3779{
3780 static struct fault_random_state rrs = {0, 0};
3781
3782 unsigned int ret = (
3783 (drbd_fault_devs == 0 ||
3784 ((1 << device_to_minor(device)) & drbd_fault_devs) != 0) &&
3785 (((_drbd_fault_random(&rrs) % 100) + 1) <= drbd_fault_rate));
3786
3787 if (ret) {
3788 drbd_fault_count++;
3789
3790 if (__ratelimit(&drbd_ratelimit_state))
3791 drbd_warn(device, "***Simulating %s failure\n",
3792 _drbd_fault_str(type));
3793 }
3794
3795 return ret;
3796}
3797#endif
3798
3799const char *drbd_buildtag(void)
3800{
3801
3802
3803
3804 static char buildtag[38] = "\0uilt-in";
3805
3806 if (buildtag[0] == 0) {
3807#ifdef MODULE
3808 sprintf(buildtag, "srcversion: %-24s", THIS_MODULE->srcversion);
3809#else
3810 buildtag[0] = 'b';
3811#endif
3812 }
3813
3814 return buildtag;
3815}
3816
3817module_init(drbd_init)
3818module_exit(drbd_cleanup)
3819
3820EXPORT_SYMBOL(drbd_conn_str);
3821EXPORT_SYMBOL(drbd_role_str);
3822EXPORT_SYMBOL(drbd_disk_str);
3823EXPORT_SYMBOL(drbd_set_st_err_str);
3824