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Commit | Line | Data |
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b411b363 PR |
1 | /* |
2 | drbd.c | |
3 | ||
4 | This file is part of DRBD by Philipp Reisner and Lars Ellenberg. | |
5 | ||
6 | Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. | |
7 | Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>. | |
8 | Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. | |
9 | ||
10 | Thanks to Carter Burden, Bart Grantham and Gennadiy Nerubayev | |
11 | from Logicworks, Inc. for making SDP replication support possible. | |
12 | ||
13 | drbd is free software; you can redistribute it and/or modify | |
14 | it under the terms of the GNU General Public License as published by | |
15 | the Free Software Foundation; either version 2, or (at your option) | |
16 | any later version. | |
17 | ||
18 | drbd is distributed in the hope that it will be useful, | |
19 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | GNU General Public License for more details. | |
22 | ||
23 | You should have received a copy of the GNU General Public License | |
24 | along with drbd; see the file COPYING. If not, write to | |
25 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
26 | ||
27 | */ | |
28 | ||
b411b363 | 29 | #include <linux/module.h> |
b411b363 PR |
30 | #include <linux/drbd.h> |
31 | #include <asm/uaccess.h> | |
32 | #include <asm/types.h> | |
33 | #include <net/sock.h> | |
34 | #include <linux/ctype.h> | |
2a48fc0a | 35 | #include <linux/mutex.h> |
b411b363 PR |
36 | #include <linux/fs.h> |
37 | #include <linux/file.h> | |
38 | #include <linux/proc_fs.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/mm.h> | |
41 | #include <linux/memcontrol.h> | |
42 | #include <linux/mm_inline.h> | |
43 | #include <linux/slab.h> | |
44 | #include <linux/random.h> | |
45 | #include <linux/reboot.h> | |
46 | #include <linux/notifier.h> | |
47 | #include <linux/kthread.h> | |
48 | ||
49 | #define __KERNEL_SYSCALLS__ | |
50 | #include <linux/unistd.h> | |
51 | #include <linux/vmalloc.h> | |
52 | ||
53 | #include <linux/drbd_limits.h> | |
54 | #include "drbd_int.h" | |
b411b363 PR |
55 | #include "drbd_req.h" /* only for _req_mod in tl_release and tl_clear */ |
56 | ||
57 | #include "drbd_vli.h" | |
58 | ||
2a48fc0a | 59 | static DEFINE_MUTEX(drbd_main_mutex); |
b411b363 PR |
60 | int drbdd_init(struct drbd_thread *); |
61 | int drbd_worker(struct drbd_thread *); | |
62 | int drbd_asender(struct drbd_thread *); | |
63 | ||
64 | int drbd_init(void); | |
65 | static int drbd_open(struct block_device *bdev, fmode_t mode); | |
66 | static int drbd_release(struct gendisk *gd, fmode_t mode); | |
99920dc5 | 67 | static int w_md_sync(struct drbd_work *w, int unused); |
b411b363 | 68 | static void md_sync_timer_fn(unsigned long data); |
99920dc5 AG |
69 | static int w_bitmap_io(struct drbd_work *w, int unused); |
70 | static int w_go_diskless(struct drbd_work *w, int unused); | |
b411b363 | 71 | |
b411b363 PR |
72 | MODULE_AUTHOR("Philipp Reisner <phil@linbit.com>, " |
73 | "Lars Ellenberg <lars@linbit.com>"); | |
74 | MODULE_DESCRIPTION("drbd - Distributed Replicated Block Device v" REL_VERSION); | |
75 | MODULE_VERSION(REL_VERSION); | |
76 | MODULE_LICENSE("GPL"); | |
81a5d60e | 77 | MODULE_PARM_DESC(minor_count, "Approximate number of drbd devices (" |
2b8a90b5 | 78 | __stringify(DRBD_MINOR_COUNT_MIN) "-" __stringify(DRBD_MINOR_COUNT_MAX) ")"); |
b411b363 PR |
79 | MODULE_ALIAS_BLOCKDEV_MAJOR(DRBD_MAJOR); |
80 | ||
81 | #include <linux/moduleparam.h> | |
82 | /* allow_open_on_secondary */ | |
83 | MODULE_PARM_DESC(allow_oos, "DONT USE!"); | |
84 | /* thanks to these macros, if compiled into the kernel (not-module), | |
85 | * this becomes the boot parameter drbd.minor_count */ | |
86 | module_param(minor_count, uint, 0444); | |
87 | module_param(disable_sendpage, bool, 0644); | |
88 | module_param(allow_oos, bool, 0); | |
b411b363 PR |
89 | module_param(proc_details, int, 0644); |
90 | ||
91 | #ifdef CONFIG_DRBD_FAULT_INJECTION | |
92 | int enable_faults; | |
93 | int fault_rate; | |
94 | static int fault_count; | |
95 | int fault_devs; | |
96 | /* bitmap of enabled faults */ | |
97 | module_param(enable_faults, int, 0664); | |
98 | /* fault rate % value - applies to all enabled faults */ | |
99 | module_param(fault_rate, int, 0664); | |
100 | /* count of faults inserted */ | |
101 | module_param(fault_count, int, 0664); | |
102 | /* bitmap of devices to insert faults on */ | |
103 | module_param(fault_devs, int, 0644); | |
104 | #endif | |
105 | ||
106 | /* module parameter, defined */ | |
2b8a90b5 | 107 | unsigned int minor_count = DRBD_MINOR_COUNT_DEF; |
b411b363 PR |
108 | int disable_sendpage; |
109 | int allow_oos; | |
b411b363 PR |
110 | int proc_details; /* Detail level in proc drbd*/ |
111 | ||
112 | /* Module parameter for setting the user mode helper program | |
113 | * to run. Default is /sbin/drbdadm */ | |
114 | char usermode_helper[80] = "/sbin/drbdadm"; | |
115 | ||
116 | module_param_string(usermode_helper, usermode_helper, sizeof(usermode_helper), 0644); | |
117 | ||
118 | /* in 2.6.x, our device mapping and config info contains our virtual gendisks | |
119 | * as member "struct gendisk *vdisk;" | |
120 | */ | |
81a5d60e | 121 | struct idr minors; |
2111438b | 122 | struct list_head drbd_tconns; /* list of struct drbd_tconn */ |
b411b363 PR |
123 | |
124 | struct kmem_cache *drbd_request_cache; | |
6c852bec | 125 | struct kmem_cache *drbd_ee_cache; /* peer requests */ |
b411b363 PR |
126 | struct kmem_cache *drbd_bm_ext_cache; /* bitmap extents */ |
127 | struct kmem_cache *drbd_al_ext_cache; /* activity log extents */ | |
128 | mempool_t *drbd_request_mempool; | |
129 | mempool_t *drbd_ee_mempool; | |
35abf594 | 130 | mempool_t *drbd_md_io_page_pool; |
da4a75d2 | 131 | struct bio_set *drbd_md_io_bio_set; |
b411b363 PR |
132 | |
133 | /* I do not use a standard mempool, because: | |
134 | 1) I want to hand out the pre-allocated objects first. | |
135 | 2) I want to be able to interrupt sleeping allocation with a signal. | |
136 | Note: This is a single linked list, the next pointer is the private | |
137 | member of struct page. | |
138 | */ | |
139 | struct page *drbd_pp_pool; | |
140 | spinlock_t drbd_pp_lock; | |
141 | int drbd_pp_vacant; | |
142 | wait_queue_head_t drbd_pp_wait; | |
143 | ||
144 | DEFINE_RATELIMIT_STATE(drbd_ratelimit_state, 5 * HZ, 5); | |
145 | ||
7d4e9d09 | 146 | static const struct block_device_operations drbd_ops = { |
b411b363 PR |
147 | .owner = THIS_MODULE, |
148 | .open = drbd_open, | |
149 | .release = drbd_release, | |
150 | }; | |
151 | ||
da4a75d2 LE |
152 | static void bio_destructor_drbd(struct bio *bio) |
153 | { | |
154 | bio_free(bio, drbd_md_io_bio_set); | |
155 | } | |
156 | ||
157 | struct bio *bio_alloc_drbd(gfp_t gfp_mask) | |
158 | { | |
159 | struct bio *bio; | |
160 | ||
161 | if (!drbd_md_io_bio_set) | |
162 | return bio_alloc(gfp_mask, 1); | |
163 | ||
164 | bio = bio_alloc_bioset(gfp_mask, 1, drbd_md_io_bio_set); | |
165 | if (!bio) | |
166 | return NULL; | |
167 | bio->bi_destructor = bio_destructor_drbd; | |
168 | return bio; | |
169 | } | |
170 | ||
b411b363 PR |
171 | #ifdef __CHECKER__ |
172 | /* When checking with sparse, and this is an inline function, sparse will | |
173 | give tons of false positives. When this is a real functions sparse works. | |
174 | */ | |
175 | int _get_ldev_if_state(struct drbd_conf *mdev, enum drbd_disk_state mins) | |
176 | { | |
177 | int io_allowed; | |
178 | ||
179 | atomic_inc(&mdev->local_cnt); | |
180 | io_allowed = (mdev->state.disk >= mins); | |
181 | if (!io_allowed) { | |
182 | if (atomic_dec_and_test(&mdev->local_cnt)) | |
183 | wake_up(&mdev->misc_wait); | |
184 | } | |
185 | return io_allowed; | |
186 | } | |
187 | ||
188 | #endif | |
189 | ||
190 | /** | |
191 | * DOC: The transfer log | |
192 | * | |
193 | * The transfer log is a single linked list of &struct drbd_tl_epoch objects. | |
87eeee41 | 194 | * mdev->tconn->newest_tle points to the head, mdev->tconn->oldest_tle points to the tail |
b411b363 PR |
195 | * of the list. There is always at least one &struct drbd_tl_epoch object. |
196 | * | |
197 | * Each &struct drbd_tl_epoch has a circular double linked list of requests | |
198 | * attached. | |
199 | */ | |
2f5cdd0b | 200 | static int tl_init(struct drbd_tconn *tconn) |
b411b363 PR |
201 | { |
202 | struct drbd_tl_epoch *b; | |
203 | ||
204 | /* during device minor initialization, we may well use GFP_KERNEL */ | |
205 | b = kmalloc(sizeof(struct drbd_tl_epoch), GFP_KERNEL); | |
206 | if (!b) | |
207 | return 0; | |
208 | INIT_LIST_HEAD(&b->requests); | |
209 | INIT_LIST_HEAD(&b->w.list); | |
210 | b->next = NULL; | |
211 | b->br_number = 4711; | |
7e602c0a | 212 | b->n_writes = 0; |
b411b363 PR |
213 | b->w.cb = NULL; /* if this is != NULL, we need to dec_ap_pending in tl_clear */ |
214 | ||
2f5cdd0b PR |
215 | tconn->oldest_tle = b; |
216 | tconn->newest_tle = b; | |
217 | INIT_LIST_HEAD(&tconn->out_of_sequence_requests); | |
b411b363 | 218 | |
b411b363 PR |
219 | return 1; |
220 | } | |
221 | ||
2f5cdd0b | 222 | static void tl_cleanup(struct drbd_tconn *tconn) |
b411b363 | 223 | { |
2f5cdd0b PR |
224 | if (tconn->oldest_tle != tconn->newest_tle) |
225 | conn_err(tconn, "ASSERT FAILED: oldest_tle == newest_tle\n"); | |
226 | if (!list_empty(&tconn->out_of_sequence_requests)) | |
227 | conn_err(tconn, "ASSERT FAILED: list_empty(out_of_sequence_requests)\n"); | |
228 | kfree(tconn->oldest_tle); | |
229 | tconn->oldest_tle = NULL; | |
230 | kfree(tconn->unused_spare_tle); | |
231 | tconn->unused_spare_tle = NULL; | |
d628769b AG |
232 | } |
233 | ||
b411b363 PR |
234 | /** |
235 | * _tl_add_barrier() - Adds a barrier to the transfer log | |
236 | * @mdev: DRBD device. | |
237 | * @new: Barrier to be added before the current head of the TL. | |
238 | * | |
239 | * The caller must hold the req_lock. | |
240 | */ | |
2f5cdd0b | 241 | void _tl_add_barrier(struct drbd_tconn *tconn, struct drbd_tl_epoch *new) |
b411b363 PR |
242 | { |
243 | struct drbd_tl_epoch *newest_before; | |
244 | ||
245 | INIT_LIST_HEAD(&new->requests); | |
246 | INIT_LIST_HEAD(&new->w.list); | |
247 | new->w.cb = NULL; /* if this is != NULL, we need to dec_ap_pending in tl_clear */ | |
248 | new->next = NULL; | |
7e602c0a | 249 | new->n_writes = 0; |
b411b363 | 250 | |
2f5cdd0b | 251 | newest_before = tconn->newest_tle; |
b411b363 PR |
252 | /* never send a barrier number == 0, because that is special-cased |
253 | * when using TCQ for our write ordering code */ | |
254 | new->br_number = (newest_before->br_number+1) ?: 1; | |
2f5cdd0b PR |
255 | if (tconn->newest_tle != new) { |
256 | tconn->newest_tle->next = new; | |
257 | tconn->newest_tle = new; | |
b411b363 PR |
258 | } |
259 | } | |
260 | ||
261 | /** | |
262 | * tl_release() - Free or recycle the oldest &struct drbd_tl_epoch object of the TL | |
263 | * @mdev: DRBD device. | |
264 | * @barrier_nr: Expected identifier of the DRBD write barrier packet. | |
265 | * @set_size: Expected number of requests before that barrier. | |
266 | * | |
267 | * In case the passed barrier_nr or set_size does not match the oldest | |
268 | * &struct drbd_tl_epoch objects this function will cause a termination | |
269 | * of the connection. | |
270 | */ | |
2f5cdd0b PR |
271 | void tl_release(struct drbd_tconn *tconn, unsigned int barrier_nr, |
272 | unsigned int set_size) | |
b411b363 | 273 | { |
2f5cdd0b | 274 | struct drbd_conf *mdev; |
b411b363 PR |
275 | struct drbd_tl_epoch *b, *nob; /* next old barrier */ |
276 | struct list_head *le, *tle; | |
277 | struct drbd_request *r; | |
278 | ||
2f5cdd0b | 279 | spin_lock_irq(&tconn->req_lock); |
b411b363 | 280 | |
2f5cdd0b | 281 | b = tconn->oldest_tle; |
b411b363 PR |
282 | |
283 | /* first some paranoia code */ | |
284 | if (b == NULL) { | |
2f5cdd0b PR |
285 | conn_err(tconn, "BAD! BarrierAck #%u received, but no epoch in tl!?\n", |
286 | barrier_nr); | |
b411b363 PR |
287 | goto bail; |
288 | } | |
289 | if (b->br_number != barrier_nr) { | |
2f5cdd0b PR |
290 | conn_err(tconn, "BAD! BarrierAck #%u received, expected #%u!\n", |
291 | barrier_nr, b->br_number); | |
b411b363 PR |
292 | goto bail; |
293 | } | |
7e602c0a | 294 | if (b->n_writes != set_size) { |
2f5cdd0b PR |
295 | conn_err(tconn, "BAD! BarrierAck #%u received with n_writes=%u, expected n_writes=%u!\n", |
296 | barrier_nr, set_size, b->n_writes); | |
b411b363 PR |
297 | goto bail; |
298 | } | |
299 | ||
300 | /* Clean up list of requests processed during current epoch */ | |
301 | list_for_each_safe(le, tle, &b->requests) { | |
302 | r = list_entry(le, struct drbd_request, tl_requests); | |
8554df1c | 303 | _req_mod(r, BARRIER_ACKED); |
b411b363 PR |
304 | } |
305 | /* There could be requests on the list waiting for completion | |
306 | of the write to the local disk. To avoid corruptions of | |
307 | slab's data structures we have to remove the lists head. | |
308 | ||
309 | Also there could have been a barrier ack out of sequence, overtaking | |
310 | the write acks - which would be a bug and violating write ordering. | |
311 | To not deadlock in case we lose connection while such requests are | |
312 | still pending, we need some way to find them for the | |
8554df1c | 313 | _req_mode(CONNECTION_LOST_WHILE_PENDING). |
b411b363 PR |
314 | |
315 | These have been list_move'd to the out_of_sequence_requests list in | |
8554df1c | 316 | _req_mod(, BARRIER_ACKED) above. |
b411b363 PR |
317 | */ |
318 | list_del_init(&b->requests); | |
2f5cdd0b | 319 | mdev = b->w.mdev; |
b411b363 PR |
320 | |
321 | nob = b->next; | |
322 | if (test_and_clear_bit(CREATE_BARRIER, &mdev->flags)) { | |
2f5cdd0b | 323 | _tl_add_barrier(tconn, b); |
b411b363 | 324 | if (nob) |
2f5cdd0b | 325 | tconn->oldest_tle = nob; |
b411b363 | 326 | /* if nob == NULL b was the only barrier, and becomes the new |
2f5cdd0b | 327 | barrier. Therefore tconn->oldest_tle points already to b */ |
b411b363 PR |
328 | } else { |
329 | D_ASSERT(nob != NULL); | |
2f5cdd0b | 330 | tconn->oldest_tle = nob; |
b411b363 PR |
331 | kfree(b); |
332 | } | |
333 | ||
2f5cdd0b | 334 | spin_unlock_irq(&tconn->req_lock); |
b411b363 PR |
335 | dec_ap_pending(mdev); |
336 | ||
337 | return; | |
338 | ||
339 | bail: | |
2f5cdd0b PR |
340 | spin_unlock_irq(&tconn->req_lock); |
341 | conn_request_state(tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); | |
b411b363 PR |
342 | } |
343 | ||
617049aa | 344 | |
b411b363 | 345 | /** |
11b58e73 | 346 | * _tl_restart() - Walks the transfer log, and applies an action to all requests |
b411b363 | 347 | * @mdev: DRBD device. |
11b58e73 | 348 | * @what: The action/event to perform with all request objects |
b411b363 | 349 | * |
8554df1c AG |
350 | * @what might be one of CONNECTION_LOST_WHILE_PENDING, RESEND, FAIL_FROZEN_DISK_IO, |
351 | * RESTART_FROZEN_DISK_IO. | |
b411b363 | 352 | */ |
2f5cdd0b | 353 | void _tl_restart(struct drbd_tconn *tconn, enum drbd_req_event what) |
b411b363 | 354 | { |
11b58e73 | 355 | struct drbd_tl_epoch *b, *tmp, **pn; |
b9b98716 | 356 | struct list_head *le, *tle, carry_reads; |
11b58e73 PR |
357 | struct drbd_request *req; |
358 | int rv, n_writes, n_reads; | |
b411b363 | 359 | |
2f5cdd0b PR |
360 | b = tconn->oldest_tle; |
361 | pn = &tconn->oldest_tle; | |
b411b363 | 362 | while (b) { |
11b58e73 PR |
363 | n_writes = 0; |
364 | n_reads = 0; | |
b9b98716 | 365 | INIT_LIST_HEAD(&carry_reads); |
b411b363 | 366 | list_for_each_safe(le, tle, &b->requests) { |
11b58e73 PR |
367 | req = list_entry(le, struct drbd_request, tl_requests); |
368 | rv = _req_mod(req, what); | |
369 | ||
370 | n_writes += (rv & MR_WRITE) >> MR_WRITE_SHIFT; | |
371 | n_reads += (rv & MR_READ) >> MR_READ_SHIFT; | |
b411b363 PR |
372 | } |
373 | tmp = b->next; | |
374 | ||
b9b98716 | 375 | if (n_writes) { |
8554df1c | 376 | if (what == RESEND) { |
11b58e73 PR |
377 | b->n_writes = n_writes; |
378 | if (b->w.cb == NULL) { | |
379 | b->w.cb = w_send_barrier; | |
2f5cdd0b PR |
380 | inc_ap_pending(b->w.mdev); |
381 | set_bit(CREATE_BARRIER, &b->w.mdev->flags); | |
11b58e73 PR |
382 | } |
383 | ||
2f5cdd0b | 384 | drbd_queue_work(&tconn->data.work, &b->w); |
11b58e73 PR |
385 | } |
386 | pn = &b->next; | |
387 | } else { | |
b9b98716 PR |
388 | if (n_reads) |
389 | list_add(&carry_reads, &b->requests); | |
11b58e73 PR |
390 | /* there could still be requests on that ring list, |
391 | * in case local io is still pending */ | |
392 | list_del(&b->requests); | |
393 | ||
394 | /* dec_ap_pending corresponding to queue_barrier. | |
395 | * the newest barrier may not have been queued yet, | |
396 | * in which case w.cb is still NULL. */ | |
397 | if (b->w.cb != NULL) | |
2f5cdd0b | 398 | dec_ap_pending(b->w.mdev); |
11b58e73 | 399 | |
2f5cdd0b | 400 | if (b == tconn->newest_tle) { |
11b58e73 | 401 | /* recycle, but reinit! */ |
2f5cdd0b PR |
402 | if (tmp != NULL) |
403 | conn_err(tconn, "ASSERT FAILED tmp == NULL"); | |
11b58e73 | 404 | INIT_LIST_HEAD(&b->requests); |
b9b98716 | 405 | list_splice(&carry_reads, &b->requests); |
11b58e73 PR |
406 | INIT_LIST_HEAD(&b->w.list); |
407 | b->w.cb = NULL; | |
408 | b->br_number = net_random(); | |
409 | b->n_writes = 0; | |
410 | ||
411 | *pn = b; | |
412 | break; | |
413 | } | |
414 | *pn = tmp; | |
415 | kfree(b); | |
b411b363 | 416 | } |
b411b363 | 417 | b = tmp; |
b9b98716 | 418 | list_splice(&carry_reads, &b->requests); |
b411b363 | 419 | } |
11b58e73 PR |
420 | } |
421 | ||
b411b363 PR |
422 | |
423 | /** | |
424 | * tl_clear() - Clears all requests and &struct drbd_tl_epoch objects out of the TL | |
425 | * @mdev: DRBD device. | |
426 | * | |
427 | * This is called after the connection to the peer was lost. The storage covered | |
428 | * by the requests on the transfer gets marked as our of sync. Called from the | |
429 | * receiver thread and the worker thread. | |
430 | */ | |
2f5cdd0b | 431 | void tl_clear(struct drbd_tconn *tconn) |
b411b363 | 432 | { |
2f5cdd0b | 433 | struct drbd_conf *mdev; |
b411b363 PR |
434 | struct list_head *le, *tle; |
435 | struct drbd_request *r; | |
e90285e0 | 436 | int vnr; |
b411b363 | 437 | |
2f5cdd0b | 438 | spin_lock_irq(&tconn->req_lock); |
b411b363 | 439 | |
2f5cdd0b | 440 | _tl_restart(tconn, CONNECTION_LOST_WHILE_PENDING); |
b411b363 PR |
441 | |
442 | /* we expect this list to be empty. */ | |
2f5cdd0b PR |
443 | if (!list_empty(&tconn->out_of_sequence_requests)) |
444 | conn_err(tconn, "ASSERT FAILED list_empty(&out_of_sequence_requests)\n"); | |
b411b363 PR |
445 | |
446 | /* but just in case, clean it up anyways! */ | |
2f5cdd0b | 447 | list_for_each_safe(le, tle, &tconn->out_of_sequence_requests) { |
b411b363 PR |
448 | r = list_entry(le, struct drbd_request, tl_requests); |
449 | /* It would be nice to complete outside of spinlock. | |
450 | * But this is easier for now. */ | |
8554df1c | 451 | _req_mod(r, CONNECTION_LOST_WHILE_PENDING); |
b411b363 PR |
452 | } |
453 | ||
454 | /* ensure bit indicating barrier is required is clear */ | |
695d08fa | 455 | rcu_read_lock(); |
e90285e0 | 456 | idr_for_each_entry(&tconn->volumes, mdev, vnr) |
2f5cdd0b | 457 | clear_bit(CREATE_BARRIER, &mdev->flags); |
695d08fa | 458 | rcu_read_unlock(); |
b411b363 | 459 | |
2f5cdd0b | 460 | spin_unlock_irq(&tconn->req_lock); |
b411b363 PR |
461 | } |
462 | ||
2f5cdd0b | 463 | void tl_restart(struct drbd_tconn *tconn, enum drbd_req_event what) |
11b58e73 | 464 | { |
2f5cdd0b PR |
465 | spin_lock_irq(&tconn->req_lock); |
466 | _tl_restart(tconn, what); | |
467 | spin_unlock_irq(&tconn->req_lock); | |
b411b363 PR |
468 | } |
469 | ||
b411b363 PR |
470 | static int drbd_thread_setup(void *arg) |
471 | { | |
472 | struct drbd_thread *thi = (struct drbd_thread *) arg; | |
392c8801 | 473 | struct drbd_tconn *tconn = thi->tconn; |
b411b363 PR |
474 | unsigned long flags; |
475 | int retval; | |
476 | ||
f1b3a6ec | 477 | snprintf(current->comm, sizeof(current->comm), "drbd_%c_%s", |
392c8801 | 478 | thi->name[0], thi->tconn->name); |
f1b3a6ec | 479 | |
b411b363 PR |
480 | restart: |
481 | retval = thi->function(thi); | |
482 | ||
483 | spin_lock_irqsave(&thi->t_lock, flags); | |
484 | ||
e77a0a5c | 485 | /* if the receiver has been "EXITING", the last thing it did |
b411b363 PR |
486 | * was set the conn state to "StandAlone", |
487 | * if now a re-connect request comes in, conn state goes C_UNCONNECTED, | |
488 | * and receiver thread will be "started". | |
e77a0a5c | 489 | * drbd_thread_start needs to set "RESTARTING" in that case. |
b411b363 | 490 | * t_state check and assignment needs to be within the same spinlock, |
e77a0a5c AG |
491 | * so either thread_start sees EXITING, and can remap to RESTARTING, |
492 | * or thread_start see NONE, and can proceed as normal. | |
b411b363 PR |
493 | */ |
494 | ||
e77a0a5c | 495 | if (thi->t_state == RESTARTING) { |
392c8801 | 496 | conn_info(tconn, "Restarting %s thread\n", thi->name); |
e77a0a5c | 497 | thi->t_state = RUNNING; |
b411b363 PR |
498 | spin_unlock_irqrestore(&thi->t_lock, flags); |
499 | goto restart; | |
500 | } | |
501 | ||
502 | thi->task = NULL; | |
e77a0a5c | 503 | thi->t_state = NONE; |
b411b363 | 504 | smp_mb(); |
992d6e91 | 505 | complete_all(&thi->stop); |
b411b363 PR |
506 | spin_unlock_irqrestore(&thi->t_lock, flags); |
507 | ||
392c8801 | 508 | conn_info(tconn, "Terminating %s\n", current->comm); |
b411b363 PR |
509 | |
510 | /* Release mod reference taken when thread was started */ | |
9dc9fbb3 PR |
511 | |
512 | kref_put(&tconn->kref, &conn_destroy); | |
b411b363 PR |
513 | module_put(THIS_MODULE); |
514 | return retval; | |
515 | } | |
516 | ||
392c8801 | 517 | static void drbd_thread_init(struct drbd_tconn *tconn, struct drbd_thread *thi, |
bed879ae | 518 | int (*func) (struct drbd_thread *), char *name) |
b411b363 PR |
519 | { |
520 | spin_lock_init(&thi->t_lock); | |
521 | thi->task = NULL; | |
e77a0a5c | 522 | thi->t_state = NONE; |
b411b363 | 523 | thi->function = func; |
392c8801 | 524 | thi->tconn = tconn; |
bed879ae | 525 | strncpy(thi->name, name, ARRAY_SIZE(thi->name)); |
b411b363 PR |
526 | } |
527 | ||
528 | int drbd_thread_start(struct drbd_thread *thi) | |
529 | { | |
392c8801 | 530 | struct drbd_tconn *tconn = thi->tconn; |
b411b363 PR |
531 | struct task_struct *nt; |
532 | unsigned long flags; | |
533 | ||
b411b363 PR |
534 | /* is used from state engine doing drbd_thread_stop_nowait, |
535 | * while holding the req lock irqsave */ | |
536 | spin_lock_irqsave(&thi->t_lock, flags); | |
537 | ||
538 | switch (thi->t_state) { | |
e77a0a5c | 539 | case NONE: |
392c8801 | 540 | conn_info(tconn, "Starting %s thread (from %s [%d])\n", |
bed879ae | 541 | thi->name, current->comm, current->pid); |
b411b363 PR |
542 | |
543 | /* Get ref on module for thread - this is released when thread exits */ | |
544 | if (!try_module_get(THIS_MODULE)) { | |
392c8801 | 545 | conn_err(tconn, "Failed to get module reference in drbd_thread_start\n"); |
b411b363 | 546 | spin_unlock_irqrestore(&thi->t_lock, flags); |
81e84650 | 547 | return false; |
b411b363 PR |
548 | } |
549 | ||
9dc9fbb3 PR |
550 | kref_get(&thi->tconn->kref); |
551 | ||
b411b363 | 552 | init_completion(&thi->stop); |
b411b363 | 553 | thi->reset_cpu_mask = 1; |
e77a0a5c | 554 | thi->t_state = RUNNING; |
b411b363 PR |
555 | spin_unlock_irqrestore(&thi->t_lock, flags); |
556 | flush_signals(current); /* otherw. may get -ERESTARTNOINTR */ | |
557 | ||
558 | nt = kthread_create(drbd_thread_setup, (void *) thi, | |
392c8801 | 559 | "drbd_%c_%s", thi->name[0], thi->tconn->name); |
b411b363 PR |
560 | |
561 | if (IS_ERR(nt)) { | |
392c8801 | 562 | conn_err(tconn, "Couldn't start thread\n"); |
b411b363 | 563 | |
9dc9fbb3 | 564 | kref_put(&tconn->kref, &conn_destroy); |
b411b363 | 565 | module_put(THIS_MODULE); |
81e84650 | 566 | return false; |
b411b363 PR |
567 | } |
568 | spin_lock_irqsave(&thi->t_lock, flags); | |
569 | thi->task = nt; | |
e77a0a5c | 570 | thi->t_state = RUNNING; |
b411b363 PR |
571 | spin_unlock_irqrestore(&thi->t_lock, flags); |
572 | wake_up_process(nt); | |
573 | break; | |
e77a0a5c AG |
574 | case EXITING: |
575 | thi->t_state = RESTARTING; | |
392c8801 | 576 | conn_info(tconn, "Restarting %s thread (from %s [%d])\n", |
bed879ae | 577 | thi->name, current->comm, current->pid); |
b411b363 | 578 | /* fall through */ |
e77a0a5c AG |
579 | case RUNNING: |
580 | case RESTARTING: | |
b411b363 PR |
581 | default: |
582 | spin_unlock_irqrestore(&thi->t_lock, flags); | |
583 | break; | |
584 | } | |
585 | ||
81e84650 | 586 | return true; |
b411b363 PR |
587 | } |
588 | ||
589 | ||
590 | void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait) | |
591 | { | |
592 | unsigned long flags; | |
593 | ||
e77a0a5c | 594 | enum drbd_thread_state ns = restart ? RESTARTING : EXITING; |
b411b363 PR |
595 | |
596 | /* may be called from state engine, holding the req lock irqsave */ | |
597 | spin_lock_irqsave(&thi->t_lock, flags); | |
598 | ||
e77a0a5c | 599 | if (thi->t_state == NONE) { |
b411b363 PR |
600 | spin_unlock_irqrestore(&thi->t_lock, flags); |
601 | if (restart) | |
602 | drbd_thread_start(thi); | |
603 | return; | |
604 | } | |
605 | ||
606 | if (thi->t_state != ns) { | |
607 | if (thi->task == NULL) { | |
608 | spin_unlock_irqrestore(&thi->t_lock, flags); | |
609 | return; | |
610 | } | |
611 | ||
612 | thi->t_state = ns; | |
613 | smp_mb(); | |
614 | init_completion(&thi->stop); | |
615 | if (thi->task != current) | |
616 | force_sig(DRBD_SIGKILL, thi->task); | |
b411b363 PR |
617 | } |
618 | ||
619 | spin_unlock_irqrestore(&thi->t_lock, flags); | |
620 | ||
621 | if (wait) | |
622 | wait_for_completion(&thi->stop); | |
623 | } | |
624 | ||
392c8801 | 625 | static struct drbd_thread *drbd_task_to_thread(struct drbd_tconn *tconn, struct task_struct *task) |
bed879ae | 626 | { |
bed879ae PR |
627 | struct drbd_thread *thi = |
628 | task == tconn->receiver.task ? &tconn->receiver : | |
629 | task == tconn->asender.task ? &tconn->asender : | |
630 | task == tconn->worker.task ? &tconn->worker : NULL; | |
631 | ||
632 | return thi; | |
633 | } | |
634 | ||
392c8801 | 635 | char *drbd_task_to_thread_name(struct drbd_tconn *tconn, struct task_struct *task) |
bed879ae | 636 | { |
392c8801 | 637 | struct drbd_thread *thi = drbd_task_to_thread(tconn, task); |
bed879ae PR |
638 | return thi ? thi->name : task->comm; |
639 | } | |
640 | ||
80883197 | 641 | int conn_lowest_minor(struct drbd_tconn *tconn) |
80822284 | 642 | { |
e90285e0 | 643 | struct drbd_conf *mdev; |
695d08fa | 644 | int vnr = 0, m; |
774b3055 | 645 | |
695d08fa | 646 | rcu_read_lock(); |
e90285e0 | 647 | mdev = idr_get_next(&tconn->volumes, &vnr); |
695d08fa PR |
648 | m = mdev ? mdev_to_minor(mdev) : -1; |
649 | rcu_read_unlock(); | |
650 | ||
651 | return m; | |
80822284 | 652 | } |
774b3055 PR |
653 | |
654 | #ifdef CONFIG_SMP | |
b411b363 PR |
655 | /** |
656 | * drbd_calc_cpu_mask() - Generate CPU masks, spread over all CPUs | |
657 | * @mdev: DRBD device. | |
658 | * | |
659 | * Forces all threads of a device onto the same CPU. This is beneficial for | |
660 | * DRBD's performance. May be overwritten by user's configuration. | |
661 | */ | |
80822284 | 662 | void drbd_calc_cpu_mask(struct drbd_tconn *tconn) |
b411b363 PR |
663 | { |
664 | int ord, cpu; | |
665 | ||
666 | /* user override. */ | |
80822284 | 667 | if (cpumask_weight(tconn->cpu_mask)) |
b411b363 PR |
668 | return; |
669 | ||
80822284 | 670 | ord = conn_lowest_minor(tconn) % cpumask_weight(cpu_online_mask); |
b411b363 PR |
671 | for_each_online_cpu(cpu) { |
672 | if (ord-- == 0) { | |
80822284 | 673 | cpumask_set_cpu(cpu, tconn->cpu_mask); |
b411b363 PR |
674 | return; |
675 | } | |
676 | } | |
677 | /* should not be reached */ | |
80822284 | 678 | cpumask_setall(tconn->cpu_mask); |
b411b363 PR |
679 | } |
680 | ||
681 | /** | |
682 | * drbd_thread_current_set_cpu() - modifies the cpu mask of the _current_ thread | |
683 | * @mdev: DRBD device. | |
bc31fe33 | 684 | * @thi: drbd_thread object |
b411b363 PR |
685 | * |
686 | * call in the "main loop" of _all_ threads, no need for any mutex, current won't die | |
687 | * prematurely. | |
688 | */ | |
80822284 | 689 | void drbd_thread_current_set_cpu(struct drbd_thread *thi) |
b411b363 PR |
690 | { |
691 | struct task_struct *p = current; | |
bed879ae | 692 | |
b411b363 PR |
693 | if (!thi->reset_cpu_mask) |
694 | return; | |
695 | thi->reset_cpu_mask = 0; | |
392c8801 | 696 | set_cpus_allowed_ptr(p, thi->tconn->cpu_mask); |
b411b363 PR |
697 | } |
698 | #endif | |
699 | ||
52b061a4 AG |
700 | /** |
701 | * drbd_header_size - size of a packet header | |
702 | * | |
703 | * The header size is a multiple of 8, so any payload following the header is | |
704 | * word aligned on 64-bit architectures. (The bitmap send and receive code | |
705 | * relies on this.) | |
706 | */ | |
707 | unsigned int drbd_header_size(struct drbd_tconn *tconn) | |
708 | { | |
0c8e36d9 AG |
709 | if (tconn->agreed_pro_version >= 100) { |
710 | BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header100), 8)); | |
711 | return sizeof(struct p_header100); | |
712 | } else { | |
713 | BUILD_BUG_ON(sizeof(struct p_header80) != | |
714 | sizeof(struct p_header95)); | |
715 | BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header80), 8)); | |
716 | return sizeof(struct p_header80); | |
717 | } | |
52b061a4 AG |
718 | } |
719 | ||
e658983a | 720 | static unsigned int prepare_header80(struct p_header80 *h, enum drbd_packet cmd, int size) |
fd340c12 PR |
721 | { |
722 | h->magic = cpu_to_be32(DRBD_MAGIC); | |
723 | h->command = cpu_to_be16(cmd); | |
724 | h->length = cpu_to_be16(size); | |
e658983a | 725 | return sizeof(struct p_header80); |
fd340c12 PR |
726 | } |
727 | ||
e658983a | 728 | static unsigned int prepare_header95(struct p_header95 *h, enum drbd_packet cmd, int size) |
fd340c12 PR |
729 | { |
730 | h->magic = cpu_to_be16(DRBD_MAGIC_BIG); | |
731 | h->command = cpu_to_be16(cmd); | |
b55d84ba | 732 | h->length = cpu_to_be32(size); |
e658983a | 733 | return sizeof(struct p_header95); |
fd340c12 PR |
734 | } |
735 | ||
0c8e36d9 AG |
736 | static unsigned int prepare_header100(struct p_header100 *h, enum drbd_packet cmd, |
737 | int size, int vnr) | |
738 | { | |
739 | h->magic = cpu_to_be32(DRBD_MAGIC_100); | |
740 | h->volume = cpu_to_be16(vnr); | |
741 | h->command = cpu_to_be16(cmd); | |
742 | h->length = cpu_to_be32(size); | |
743 | h->pad = 0; | |
744 | return sizeof(struct p_header100); | |
745 | } | |
746 | ||
747 | static unsigned int prepare_header(struct drbd_tconn *tconn, int vnr, | |
748 | void *buffer, enum drbd_packet cmd, int size) | |
d38e787e | 749 | { |
0c8e36d9 AG |
750 | if (tconn->agreed_pro_version >= 100) |
751 | return prepare_header100(buffer, cmd, size, vnr); | |
752 | else if (tconn->agreed_pro_version >= 95 && | |
753 | size > DRBD_MAX_SIZE_H80_PACKET) | |
e658983a | 754 | return prepare_header95(buffer, cmd, size); |
d38e787e | 755 | else |
e658983a | 756 | return prepare_header80(buffer, cmd, size); |
d38e787e PR |
757 | } |
758 | ||
a7eb7bdf AG |
759 | static void *__conn_prepare_command(struct drbd_tconn *tconn, |
760 | struct drbd_socket *sock) | |
761 | { | |
762 | if (!sock->socket) | |
763 | return NULL; | |
764 | return sock->sbuf + drbd_header_size(tconn); | |
765 | } | |
766 | ||
dba58587 AG |
767 | void *conn_prepare_command(struct drbd_tconn *tconn, struct drbd_socket *sock) |
768 | { | |
a7eb7bdf AG |
769 | void *p; |
770 | ||
dba58587 | 771 | mutex_lock(&sock->mutex); |
a7eb7bdf AG |
772 | p = __conn_prepare_command(tconn, sock); |
773 | if (!p) | |
dba58587 | 774 | mutex_unlock(&sock->mutex); |
a7eb7bdf AG |
775 | |
776 | return p; | |
dba58587 AG |
777 | } |
778 | ||
779 | void *drbd_prepare_command(struct drbd_conf *mdev, struct drbd_socket *sock) | |
780 | { | |
781 | return conn_prepare_command(mdev->tconn, sock); | |
782 | } | |
783 | ||
784 | static int __send_command(struct drbd_tconn *tconn, int vnr, | |
785 | struct drbd_socket *sock, enum drbd_packet cmd, | |
786 | unsigned int header_size, void *data, | |
787 | unsigned int size) | |
788 | { | |
789 | int msg_flags; | |
790 | int err; | |
791 | ||
792 | /* | |
793 | * Called with @data == NULL and the size of the data blocks in @size | |
794 | * for commands that send data blocks. For those commands, omit the | |
795 | * MSG_MORE flag: this will increase the likelihood that data blocks | |
796 | * which are page aligned on the sender will end up page aligned on the | |
797 | * receiver. | |
798 | */ | |
799 | msg_flags = data ? MSG_MORE : 0; | |
800 | ||
e658983a AG |
801 | header_size += prepare_header(tconn, vnr, sock->sbuf, cmd, |
802 | header_size + size); | |
dba58587 AG |
803 | err = drbd_send_all(tconn, sock->socket, sock->sbuf, header_size, |
804 | msg_flags); | |
805 | if (data && !err) | |
806 | err = drbd_send_all(tconn, sock->socket, data, size, 0); | |
807 | return err; | |
808 | } | |
809 | ||
a7eb7bdf AG |
810 | static int __conn_send_command(struct drbd_tconn *tconn, struct drbd_socket *sock, |
811 | enum drbd_packet cmd, unsigned int header_size, | |
812 | void *data, unsigned int size) | |
813 | { | |
814 | return __send_command(tconn, 0, sock, cmd, header_size, data, size); | |
815 | } | |
816 | ||
dba58587 AG |
817 | int conn_send_command(struct drbd_tconn *tconn, struct drbd_socket *sock, |
818 | enum drbd_packet cmd, unsigned int header_size, | |
819 | void *data, unsigned int size) | |
820 | { | |
821 | int err; | |
822 | ||
a7eb7bdf | 823 | err = __conn_send_command(tconn, sock, cmd, header_size, data, size); |
dba58587 AG |
824 | mutex_unlock(&sock->mutex); |
825 | return err; | |
826 | } | |
827 | ||
828 | int drbd_send_command(struct drbd_conf *mdev, struct drbd_socket *sock, | |
829 | enum drbd_packet cmd, unsigned int header_size, | |
830 | void *data, unsigned int size) | |
831 | { | |
832 | int err; | |
833 | ||
834 | err = __send_command(mdev->tconn, mdev->vnr, sock, cmd, header_size, | |
835 | data, size); | |
836 | mutex_unlock(&sock->mutex); | |
837 | return err; | |
838 | } | |
839 | ||
e307f352 AG |
840 | int drbd_send_ping(struct drbd_tconn *tconn) |
841 | { | |
9f5bdc33 AG |
842 | struct drbd_socket *sock; |
843 | ||
844 | sock = &tconn->meta; | |
845 | if (!conn_prepare_command(tconn, sock)) | |
846 | return -EIO; | |
e658983a | 847 | return conn_send_command(tconn, sock, P_PING, 0, NULL, 0); |
e307f352 AG |
848 | } |
849 | ||
850 | int drbd_send_ping_ack(struct drbd_tconn *tconn) | |
851 | { | |
9f5bdc33 AG |
852 | struct drbd_socket *sock; |
853 | ||
854 | sock = &tconn->meta; | |
855 | if (!conn_prepare_command(tconn, sock)) | |
856 | return -EIO; | |
e658983a | 857 | return conn_send_command(tconn, sock, P_PING_ACK, 0, NULL, 0); |
e307f352 AG |
858 | } |
859 | ||
f399002e | 860 | int drbd_send_sync_param(struct drbd_conf *mdev) |
b411b363 | 861 | { |
7c96715a | 862 | struct drbd_socket *sock; |
9f5bdc33 AG |
863 | struct p_rs_param_95 *p; |
864 | int size; | |
31890f4a | 865 | const int apv = mdev->tconn->agreed_pro_version; |
9f5bdc33 | 866 | enum drbd_packet cmd; |
44ed167d | 867 | struct net_conf *nc; |
daeda1cc | 868 | struct disk_conf *dc; |
9f5bdc33 AG |
869 | |
870 | sock = &mdev->tconn->data; | |
871 | p = drbd_prepare_command(mdev, sock); | |
872 | if (!p) | |
873 | return -EIO; | |
b411b363 | 874 | |
44ed167d PR |
875 | rcu_read_lock(); |
876 | nc = rcu_dereference(mdev->tconn->net_conf); | |
877 | ||
b411b363 PR |
878 | size = apv <= 87 ? sizeof(struct p_rs_param) |
879 | : apv == 88 ? sizeof(struct p_rs_param) | |
44ed167d | 880 | + strlen(nc->verify_alg) + 1 |
8e26f9cc PR |
881 | : apv <= 94 ? sizeof(struct p_rs_param_89) |
882 | : /* apv >= 95 */ sizeof(struct p_rs_param_95); | |
b411b363 | 883 | |
9f5bdc33 | 884 | cmd = apv >= 89 ? P_SYNC_PARAM89 : P_SYNC_PARAM; |
b411b363 | 885 | |
9f5bdc33 AG |
886 | /* initialize verify_alg and csums_alg */ |
887 | memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); | |
b411b363 | 888 | |
9f5bdc33 | 889 | if (get_ldev(mdev)) { |
daeda1cc PR |
890 | dc = rcu_dereference(mdev->ldev->disk_conf); |
891 | p->rate = cpu_to_be32(dc->resync_rate); | |
892 | p->c_plan_ahead = cpu_to_be32(dc->c_plan_ahead); | |
893 | p->c_delay_target = cpu_to_be32(dc->c_delay_target); | |
894 | p->c_fill_target = cpu_to_be32(dc->c_fill_target); | |
895 | p->c_max_rate = cpu_to_be32(dc->c_max_rate); | |
9f5bdc33 AG |
896 | put_ldev(mdev); |
897 | } else { | |
898 | p->rate = cpu_to_be32(DRBD_RATE_DEF); | |
899 | p->c_plan_ahead = cpu_to_be32(DRBD_C_PLAN_AHEAD_DEF); | |
900 | p->c_delay_target = cpu_to_be32(DRBD_C_DELAY_TARGET_DEF); | |
901 | p->c_fill_target = cpu_to_be32(DRBD_C_FILL_TARGET_DEF); | |
902 | p->c_max_rate = cpu_to_be32(DRBD_C_MAX_RATE_DEF); | |
903 | } | |
b411b363 | 904 | |
9f5bdc33 | 905 | if (apv >= 88) |
44ed167d | 906 | strcpy(p->verify_alg, nc->verify_alg); |
9f5bdc33 | 907 | if (apv >= 89) |
44ed167d PR |
908 | strcpy(p->csums_alg, nc->csums_alg); |
909 | rcu_read_unlock(); | |
b411b363 | 910 | |
9f5bdc33 | 911 | return drbd_send_command(mdev, sock, cmd, size, NULL, 0); |
b411b363 PR |
912 | } |
913 | ||
a7eb7bdf | 914 | int __drbd_send_protocol(struct drbd_tconn *tconn) |
b411b363 | 915 | { |
9f5bdc33 | 916 | struct drbd_socket *sock; |
b411b363 | 917 | struct p_protocol *p; |
44ed167d | 918 | struct net_conf *nc; |
9f5bdc33 | 919 | int size, cf; |
b411b363 | 920 | |
9f5bdc33 | 921 | sock = &tconn->data; |
a7eb7bdf | 922 | p = __conn_prepare_command(tconn, sock); |
9f5bdc33 AG |
923 | if (!p) |
924 | return -EIO; | |
925 | ||
44ed167d PR |
926 | rcu_read_lock(); |
927 | nc = rcu_dereference(tconn->net_conf); | |
928 | ||
929 | if (nc->dry_run && tconn->agreed_pro_version < 92) { | |
930 | rcu_read_unlock(); | |
931 | mutex_unlock(&sock->mutex); | |
932 | conn_err(tconn, "--dry-run is not supported by peer"); | |
933 | return -EOPNOTSUPP; | |
934 | } | |
935 | ||
9f5bdc33 | 936 | size = sizeof(*p); |
dc8228d1 | 937 | if (tconn->agreed_pro_version >= 87) |
44ed167d | 938 | size += strlen(nc->integrity_alg) + 1; |
b411b363 | 939 | |
44ed167d PR |
940 | p->protocol = cpu_to_be32(nc->wire_protocol); |
941 | p->after_sb_0p = cpu_to_be32(nc->after_sb_0p); | |
942 | p->after_sb_1p = cpu_to_be32(nc->after_sb_1p); | |
943 | p->after_sb_2p = cpu_to_be32(nc->after_sb_2p); | |
944 | p->two_primaries = cpu_to_be32(nc->two_primaries); | |
cf14c2e9 | 945 | cf = 0; |
44ed167d | 946 | if (nc->want_lose) |
cf14c2e9 | 947 | cf |= CF_WANT_LOSE; |
44ed167d | 948 | if (nc->dry_run) |
9f5bdc33 | 949 | cf |= CF_DRY_RUN; |
cf14c2e9 PR |
950 | p->conn_flags = cpu_to_be32(cf); |
951 | ||
dc8228d1 | 952 | if (tconn->agreed_pro_version >= 87) |
44ed167d PR |
953 | strcpy(p->integrity_alg, nc->integrity_alg); |
954 | rcu_read_unlock(); | |
955 | ||
a7eb7bdf AG |
956 | return __conn_send_command(tconn, sock, P_PROTOCOL, size, NULL, 0); |
957 | } | |
958 | ||
959 | int drbd_send_protocol(struct drbd_tconn *tconn) | |
960 | { | |
961 | int err; | |
962 | ||
963 | mutex_lock(&tconn->data.mutex); | |
964 | err = __drbd_send_protocol(tconn); | |
965 | mutex_unlock(&tconn->data.mutex); | |
966 | ||
967 | return err; | |
b411b363 PR |
968 | } |
969 | ||
970 | int _drbd_send_uuids(struct drbd_conf *mdev, u64 uuid_flags) | |
971 | { | |
9f5bdc33 AG |
972 | struct drbd_socket *sock; |
973 | struct p_uuids *p; | |
b411b363 PR |
974 | int i; |
975 | ||
976 | if (!get_ldev_if_state(mdev, D_NEGOTIATING)) | |
2ae5f95b | 977 | return 0; |
b411b363 | 978 | |
9f5bdc33 AG |
979 | sock = &mdev->tconn->data; |
980 | p = drbd_prepare_command(mdev, sock); | |
981 | if (!p) { | |
982 | put_ldev(mdev); | |
983 | return -EIO; | |
984 | } | |
b411b363 | 985 | for (i = UI_CURRENT; i < UI_SIZE; i++) |
9f5bdc33 | 986 | p->uuid[i] = mdev->ldev ? cpu_to_be64(mdev->ldev->md.uuid[i]) : 0; |
b411b363 PR |
987 | |
988 | mdev->comm_bm_set = drbd_bm_total_weight(mdev); | |
9f5bdc33 | 989 | p->uuid[UI_SIZE] = cpu_to_be64(mdev->comm_bm_set); |
44ed167d PR |
990 | rcu_read_lock(); |
991 | uuid_flags |= rcu_dereference(mdev->tconn->net_conf)->want_lose ? 1 : 0; | |
992 | rcu_read_unlock(); | |
b411b363 PR |
993 | uuid_flags |= test_bit(CRASHED_PRIMARY, &mdev->flags) ? 2 : 0; |
994 | uuid_flags |= mdev->new_state_tmp.disk == D_INCONSISTENT ? 4 : 0; | |
9f5bdc33 | 995 | p->uuid[UI_FLAGS] = cpu_to_be64(uuid_flags); |
b411b363 PR |
996 | |
997 | put_ldev(mdev); | |
9f5bdc33 | 998 | return drbd_send_command(mdev, sock, P_UUIDS, sizeof(*p), NULL, 0); |
b411b363 PR |
999 | } |
1000 | ||
1001 | int drbd_send_uuids(struct drbd_conf *mdev) | |
1002 | { | |
1003 | return _drbd_send_uuids(mdev, 0); | |
1004 | } | |
1005 | ||
1006 | int drbd_send_uuids_skip_initial_sync(struct drbd_conf *mdev) | |
1007 | { | |
1008 | return _drbd_send_uuids(mdev, 8); | |
1009 | } | |
1010 | ||
62b0da3a LE |
1011 | void drbd_print_uuids(struct drbd_conf *mdev, const char *text) |
1012 | { | |
1013 | if (get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
1014 | u64 *uuid = mdev->ldev->md.uuid; | |
1015 | dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX\n", | |
1016 | text, | |
1017 | (unsigned long long)uuid[UI_CURRENT], | |
1018 | (unsigned long long)uuid[UI_BITMAP], | |
1019 | (unsigned long long)uuid[UI_HISTORY_START], | |
1020 | (unsigned long long)uuid[UI_HISTORY_END]); | |
1021 | put_ldev(mdev); | |
1022 | } else { | |
1023 | dev_info(DEV, "%s effective data uuid: %016llX\n", | |
1024 | text, | |
1025 | (unsigned long long)mdev->ed_uuid); | |
1026 | } | |
1027 | } | |
1028 | ||
9c1b7f72 | 1029 | void drbd_gen_and_send_sync_uuid(struct drbd_conf *mdev) |
b411b363 | 1030 | { |
9f5bdc33 AG |
1031 | struct drbd_socket *sock; |
1032 | struct p_rs_uuid *p; | |
5a22db89 LE |
1033 | u64 uuid; |
1034 | ||
1035 | D_ASSERT(mdev->state.disk == D_UP_TO_DATE); | |
b411b363 | 1036 | |
4a23f264 | 1037 | uuid = mdev->ldev->md.uuid[UI_BITMAP] + UUID_NEW_BM_OFFSET; |
5a22db89 | 1038 | drbd_uuid_set(mdev, UI_BITMAP, uuid); |
62b0da3a | 1039 | drbd_print_uuids(mdev, "updated sync UUID"); |
5a22db89 | 1040 | drbd_md_sync(mdev); |
b411b363 | 1041 | |
9f5bdc33 AG |
1042 | sock = &mdev->tconn->data; |
1043 | p = drbd_prepare_command(mdev, sock); | |
1044 | if (p) { | |
1045 | p->uuid = cpu_to_be64(uuid); | |
1046 | drbd_send_command(mdev, sock, P_SYNC_UUID, sizeof(*p), NULL, 0); | |
1047 | } | |
b411b363 PR |
1048 | } |
1049 | ||
e89b591c | 1050 | int drbd_send_sizes(struct drbd_conf *mdev, int trigger_reply, enum dds_flags flags) |
b411b363 | 1051 | { |
9f5bdc33 AG |
1052 | struct drbd_socket *sock; |
1053 | struct p_sizes *p; | |
b411b363 | 1054 | sector_t d_size, u_size; |
99432fcc | 1055 | int q_order_type, max_bio_size; |
b411b363 PR |
1056 | |
1057 | if (get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
1058 | D_ASSERT(mdev->ldev->backing_bdev); | |
1059 | d_size = drbd_get_max_capacity(mdev->ldev); | |
daeda1cc PR |
1060 | rcu_read_lock(); |
1061 | u_size = rcu_dereference(mdev->ldev->disk_conf)->disk_size; | |
1062 | rcu_read_unlock(); | |
b411b363 | 1063 | q_order_type = drbd_queue_order_type(mdev); |
99432fcc PR |
1064 | max_bio_size = queue_max_hw_sectors(mdev->ldev->backing_bdev->bd_disk->queue) << 9; |
1065 | max_bio_size = min_t(int, max_bio_size, DRBD_MAX_BIO_SIZE); | |
b411b363 PR |
1066 | put_ldev(mdev); |
1067 | } else { | |
1068 | d_size = 0; | |
1069 | u_size = 0; | |
1070 | q_order_type = QUEUE_ORDERED_NONE; | |
99432fcc | 1071 | max_bio_size = DRBD_MAX_BIO_SIZE; /* ... multiple BIOs per peer_request */ |
b411b363 PR |
1072 | } |
1073 | ||
9f5bdc33 AG |
1074 | sock = &mdev->tconn->data; |
1075 | p = drbd_prepare_command(mdev, sock); | |
1076 | if (!p) | |
1077 | return -EIO; | |
1078 | p->d_size = cpu_to_be64(d_size); | |
1079 | p->u_size = cpu_to_be64(u_size); | |
1080 | p->c_size = cpu_to_be64(trigger_reply ? 0 : drbd_get_capacity(mdev->this_bdev)); | |
1081 | p->max_bio_size = cpu_to_be32(max_bio_size); | |
1082 | p->queue_order_type = cpu_to_be16(q_order_type); | |
1083 | p->dds_flags = cpu_to_be16(flags); | |
1084 | return drbd_send_command(mdev, sock, P_SIZES, sizeof(*p), NULL, 0); | |
b411b363 PR |
1085 | } |
1086 | ||
1087 | /** | |
1088 | * drbd_send_state() - Sends the drbd state to the peer | |
1089 | * @mdev: DRBD device. | |
1090 | */ | |
1091 | int drbd_send_state(struct drbd_conf *mdev) | |
1092 | { | |
7c96715a | 1093 | struct drbd_socket *sock; |
9f5bdc33 | 1094 | struct p_state *p; |
b411b363 | 1095 | |
7c96715a | 1096 | sock = &mdev->tconn->data; |
9f5bdc33 AG |
1097 | p = drbd_prepare_command(mdev, sock); |
1098 | if (!p) | |
1099 | return -EIO; | |
1100 | p->state = cpu_to_be32(mdev->state.i); /* Within the send mutex */ | |
1101 | return drbd_send_command(mdev, sock, P_STATE, sizeof(*p), NULL, 0); | |
1102 | } | |
b411b363 | 1103 | |
9f5bdc33 AG |
1104 | int drbd_send_state_req(struct drbd_conf *mdev, union drbd_state mask, union drbd_state val) |
1105 | { | |
1106 | struct drbd_socket *sock; | |
1107 | struct p_req_state *p; | |
b411b363 | 1108 | |
9f5bdc33 AG |
1109 | sock = &mdev->tconn->data; |
1110 | p = drbd_prepare_command(mdev, sock); | |
1111 | if (!p) | |
1112 | return -EIO; | |
1113 | p->mask = cpu_to_be32(mask.i); | |
1114 | p->val = cpu_to_be32(val.i); | |
1115 | return drbd_send_command(mdev, sock, P_STATE_CHG_REQ, sizeof(*p), NULL, 0); | |
b411b363 | 1116 | |
b411b363 PR |
1117 | } |
1118 | ||
9f5bdc33 | 1119 | int conn_send_state_req(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val) |
b411b363 | 1120 | { |
9f5bdc33 AG |
1121 | enum drbd_packet cmd; |
1122 | struct drbd_socket *sock; | |
1123 | struct p_req_state *p; | |
b411b363 | 1124 | |
9f5bdc33 AG |
1125 | cmd = tconn->agreed_pro_version < 100 ? P_STATE_CHG_REQ : P_CONN_ST_CHG_REQ; |
1126 | sock = &tconn->data; | |
1127 | p = conn_prepare_command(tconn, sock); | |
1128 | if (!p) | |
1129 | return -EIO; | |
1130 | p->mask = cpu_to_be32(mask.i); | |
1131 | p->val = cpu_to_be32(val.i); | |
1132 | return conn_send_command(tconn, sock, cmd, sizeof(*p), NULL, 0); | |
b411b363 PR |
1133 | } |
1134 | ||
2f4e7abe | 1135 | void drbd_send_sr_reply(struct drbd_conf *mdev, enum drbd_state_rv retcode) |
b411b363 | 1136 | { |
9f5bdc33 AG |
1137 | struct drbd_socket *sock; |
1138 | struct p_req_state_reply *p; | |
b411b363 | 1139 | |
9f5bdc33 AG |
1140 | sock = &mdev->tconn->meta; |
1141 | p = drbd_prepare_command(mdev, sock); | |
1142 | if (p) { | |
1143 | p->retcode = cpu_to_be32(retcode); | |
1144 | drbd_send_command(mdev, sock, P_STATE_CHG_REPLY, sizeof(*p), NULL, 0); | |
1145 | } | |
b411b363 PR |
1146 | } |
1147 | ||
9f5bdc33 | 1148 | void conn_send_sr_reply(struct drbd_tconn *tconn, enum drbd_state_rv retcode) |
047cd4a6 | 1149 | { |
9f5bdc33 AG |
1150 | struct drbd_socket *sock; |
1151 | struct p_req_state_reply *p; | |
047cd4a6 PR |
1152 | enum drbd_packet cmd = tconn->agreed_pro_version < 100 ? P_STATE_CHG_REPLY : P_CONN_ST_CHG_REPLY; |
1153 | ||
9f5bdc33 AG |
1154 | sock = &tconn->meta; |
1155 | p = conn_prepare_command(tconn, sock); | |
1156 | if (p) { | |
1157 | p->retcode = cpu_to_be32(retcode); | |
1158 | conn_send_command(tconn, sock, cmd, sizeof(*p), NULL, 0); | |
1159 | } | |
047cd4a6 PR |
1160 | } |
1161 | ||
a02d1240 AG |
1162 | static void dcbp_set_code(struct p_compressed_bm *p, enum drbd_bitmap_code code) |
1163 | { | |
1164 | BUG_ON(code & ~0xf); | |
1165 | p->encoding = (p->encoding & ~0xf) | code; | |
1166 | } | |
1167 | ||
1168 | static void dcbp_set_start(struct p_compressed_bm *p, int set) | |
1169 | { | |
1170 | p->encoding = (p->encoding & ~0x80) | (set ? 0x80 : 0); | |
1171 | } | |
1172 | ||
1173 | static void dcbp_set_pad_bits(struct p_compressed_bm *p, int n) | |
1174 | { | |
1175 | BUG_ON(n & ~0x7); | |
1176 | p->encoding = (p->encoding & (~0x7 << 4)) | (n << 4); | |
1177 | } | |
1178 | ||
b411b363 | 1179 | int fill_bitmap_rle_bits(struct drbd_conf *mdev, |
50d0b1ad AG |
1180 | struct p_compressed_bm *p, |
1181 | unsigned int size, | |
1182 | struct bm_xfer_ctx *c) | |
b411b363 PR |
1183 | { |
1184 | struct bitstream bs; | |
1185 | unsigned long plain_bits; | |
1186 | unsigned long tmp; | |
1187 | unsigned long rl; | |
1188 | unsigned len; | |
1189 | unsigned toggle; | |
44ed167d | 1190 | int bits, use_rle; |
b411b363 PR |
1191 | |
1192 | /* may we use this feature? */ | |
44ed167d PR |
1193 | rcu_read_lock(); |
1194 | use_rle = rcu_dereference(mdev->tconn->net_conf)->use_rle; | |
1195 | rcu_read_unlock(); | |
1196 | if (!use_rle || mdev->tconn->agreed_pro_version < 90) | |
1197 | return 0; | |
b411b363 PR |
1198 | |
1199 | if (c->bit_offset >= c->bm_bits) | |
1200 | return 0; /* nothing to do. */ | |
1201 | ||
1202 | /* use at most thus many bytes */ | |
50d0b1ad AG |
1203 | bitstream_init(&bs, p->code, size, 0); |
1204 | memset(p->code, 0, size); | |
b411b363 PR |
1205 | /* plain bits covered in this code string */ |
1206 | plain_bits = 0; | |
1207 | ||
1208 | /* p->encoding & 0x80 stores whether the first run length is set. | |
1209 | * bit offset is implicit. | |
1210 | * start with toggle == 2 to be able to tell the first iteration */ | |
1211 | toggle = 2; | |
1212 | ||
1213 | /* see how much plain bits we can stuff into one packet | |
1214 | * using RLE and VLI. */ | |
1215 | do { | |
1216 | tmp = (toggle == 0) ? _drbd_bm_find_next_zero(mdev, c->bit_offset) | |
1217 | : _drbd_bm_find_next(mdev, c->bit_offset); | |
1218 | if (tmp == -1UL) | |
1219 | tmp = c->bm_bits; | |
1220 | rl = tmp - c->bit_offset; | |
1221 | ||
1222 | if (toggle == 2) { /* first iteration */ | |
1223 | if (rl == 0) { | |
1224 | /* the first checked bit was set, | |
1225 | * store start value, */ | |
a02d1240 | 1226 | dcbp_set_start(p, 1); |
b411b363 PR |
1227 | /* but skip encoding of zero run length */ |
1228 | toggle = !toggle; | |
1229 | continue; | |
1230 | } | |
a02d1240 | 1231 | dcbp_set_start(p, 0); |
b411b363 PR |
1232 | } |
1233 | ||
1234 | /* paranoia: catch zero runlength. | |
1235 | * can only happen if bitmap is modified while we scan it. */ | |
1236 | if (rl == 0) { | |
1237 | dev_err(DEV, "unexpected zero runlength while encoding bitmap " | |
1238 | "t:%u bo:%lu\n", toggle, c->bit_offset); | |
1239 | return -1; | |
1240 | } | |
1241 | ||
1242 | bits = vli_encode_bits(&bs, rl); | |
1243 | if (bits == -ENOBUFS) /* buffer full */ | |
1244 | break; | |
1245 | if (bits <= 0) { | |
1246 | dev_err(DEV, "error while encoding bitmap: %d\n", bits); | |
1247 | return 0; | |
1248 | } | |
1249 | ||
1250 | toggle = !toggle; | |
1251 | plain_bits += rl; | |
1252 | c->bit_offset = tmp; | |
1253 | } while (c->bit_offset < c->bm_bits); | |
1254 | ||
1255 | len = bs.cur.b - p->code + !!bs.cur.bit; | |
1256 | ||
1257 | if (plain_bits < (len << 3)) { | |
1258 | /* incompressible with this method. | |
1259 | * we need to rewind both word and bit position. */ | |
1260 | c->bit_offset -= plain_bits; | |
1261 | bm_xfer_ctx_bit_to_word_offset(c); | |
1262 | c->bit_offset = c->word_offset * BITS_PER_LONG; | |
1263 | return 0; | |
1264 | } | |
1265 | ||
1266 | /* RLE + VLI was able to compress it just fine. | |
1267 | * update c->word_offset. */ | |
1268 | bm_xfer_ctx_bit_to_word_offset(c); | |
1269 | ||
1270 | /* store pad_bits */ | |
a02d1240 | 1271 | dcbp_set_pad_bits(p, (8 - bs.cur.bit) & 0x7); |
b411b363 PR |
1272 | |
1273 | return len; | |
1274 | } | |
1275 | ||
f70af118 AG |
1276 | /** |
1277 | * send_bitmap_rle_or_plain | |
1278 | * | |
1279 | * Return 0 when done, 1 when another iteration is needed, and a negative error | |
1280 | * code upon failure. | |
1281 | */ | |
1282 | static int | |
79ed9bd0 | 1283 | send_bitmap_rle_or_plain(struct drbd_conf *mdev, struct bm_xfer_ctx *c) |
b411b363 | 1284 | { |
9f5bdc33 | 1285 | struct drbd_socket *sock = &mdev->tconn->data; |
50d0b1ad | 1286 | unsigned int header_size = drbd_header_size(mdev->tconn); |
e658983a | 1287 | struct p_compressed_bm *p = sock->sbuf + header_size; |
a982dd57 | 1288 | int len, err; |
b411b363 | 1289 | |
e658983a AG |
1290 | len = fill_bitmap_rle_bits(mdev, p, |
1291 | DRBD_SOCKET_BUFFER_SIZE - header_size - sizeof(*p), c); | |
b411b363 | 1292 | if (len < 0) |
f70af118 | 1293 | return -EIO; |
b411b363 PR |
1294 | |
1295 | if (len) { | |
a02d1240 | 1296 | dcbp_set_code(p, RLE_VLI_Bits); |
9f5bdc33 AG |
1297 | err = __send_command(mdev->tconn, mdev->vnr, sock, |
1298 | P_COMPRESSED_BITMAP, sizeof(*p) + len, | |
1299 | NULL, 0); | |
b411b363 | 1300 | c->packets[0]++; |
e658983a | 1301 | c->bytes[0] += header_size + sizeof(*p) + len; |
b411b363 PR |
1302 | |
1303 | if (c->bit_offset >= c->bm_bits) | |
1304 | len = 0; /* DONE */ | |
1305 | } else { | |
1306 | /* was not compressible. | |
1307 | * send a buffer full of plain text bits instead. */ | |
50d0b1ad AG |
1308 | unsigned int data_size; |
1309 | unsigned long num_words; | |
e658983a | 1310 | unsigned long *p = sock->sbuf + header_size; |
50d0b1ad AG |
1311 | |
1312 | data_size = DRBD_SOCKET_BUFFER_SIZE - header_size; | |
e658983a | 1313 | num_words = min_t(size_t, data_size / sizeof(*p), |
50d0b1ad | 1314 | c->bm_words - c->word_offset); |
e658983a | 1315 | len = num_words * sizeof(*p); |
b411b363 | 1316 | if (len) |
e658983a AG |
1317 | drbd_bm_get_lel(mdev, c->word_offset, num_words, p); |
1318 | err = __send_command(mdev->tconn, mdev->vnr, sock, P_BITMAP, len, NULL, 0); | |
b411b363 PR |
1319 | c->word_offset += num_words; |
1320 | c->bit_offset = c->word_offset * BITS_PER_LONG; | |
1321 | ||
1322 | c->packets[1]++; | |
50d0b1ad | 1323 | c->bytes[1] += header_size + len; |
b411b363 PR |
1324 | |
1325 | if (c->bit_offset > c->bm_bits) | |
1326 | c->bit_offset = c->bm_bits; | |
1327 | } | |
a982dd57 | 1328 | if (!err) { |
f70af118 AG |
1329 | if (len == 0) { |
1330 | INFO_bm_xfer_stats(mdev, "send", c); | |
1331 | return 0; | |
1332 | } else | |
1333 | return 1; | |
1334 | } | |
1335 | return -EIO; | |
b411b363 PR |
1336 | } |
1337 | ||
1338 | /* See the comment at receive_bitmap() */ | |
058820cd | 1339 | static int _drbd_send_bitmap(struct drbd_conf *mdev) |
b411b363 PR |
1340 | { |
1341 | struct bm_xfer_ctx c; | |
f70af118 | 1342 | int err; |
b411b363 | 1343 | |
841ce241 AG |
1344 | if (!expect(mdev->bitmap)) |
1345 | return false; | |
b411b363 | 1346 | |
b411b363 PR |
1347 | if (get_ldev(mdev)) { |
1348 | if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) { | |
1349 | dev_info(DEV, "Writing the whole bitmap, MDF_FullSync was set.\n"); | |
1350 | drbd_bm_set_all(mdev); | |
1351 | if (drbd_bm_write(mdev)) { | |
1352 | /* write_bm did fail! Leave full sync flag set in Meta P_DATA | |
1353 | * but otherwise process as per normal - need to tell other | |
1354 | * side that a full resync is required! */ | |
1355 | dev_err(DEV, "Failed to write bitmap to disk!\n"); | |
1356 | } else { | |
1357 | drbd_md_clear_flag(mdev, MDF_FULL_SYNC); | |
1358 | drbd_md_sync(mdev); | |
1359 | } | |
1360 | } | |
1361 | put_ldev(mdev); | |
1362 | } | |
1363 | ||
1364 | c = (struct bm_xfer_ctx) { | |
1365 | .bm_bits = drbd_bm_bits(mdev), | |
1366 | .bm_words = drbd_bm_words(mdev), | |
1367 | }; | |
1368 | ||
1369 | do { | |
79ed9bd0 | 1370 | err = send_bitmap_rle_or_plain(mdev, &c); |
f70af118 | 1371 | } while (err > 0); |
b411b363 | 1372 | |
f70af118 | 1373 | return err == 0; |
b411b363 PR |
1374 | } |
1375 | ||
1376 | int drbd_send_bitmap(struct drbd_conf *mdev) | |
1377 | { | |
9f5bdc33 AG |
1378 | struct drbd_socket *sock = &mdev->tconn->data; |
1379 | int err = -1; | |
b411b363 | 1380 | |
9f5bdc33 AG |
1381 | mutex_lock(&sock->mutex); |
1382 | if (sock->socket) | |
1383 | err = !_drbd_send_bitmap(mdev); | |
1384 | mutex_unlock(&sock->mutex); | |
b411b363 PR |
1385 | return err; |
1386 | } | |
9f5bdc33 | 1387 | |
d4e67d7c | 1388 | void drbd_send_b_ack(struct drbd_conf *mdev, u32 barrier_nr, u32 set_size) |
b411b363 | 1389 | { |
9f5bdc33 AG |
1390 | struct drbd_socket *sock; |
1391 | struct p_barrier_ack *p; | |
b411b363 | 1392 | |
9f5bdc33 AG |
1393 | if (mdev->state.conn < C_CONNECTED) |
1394 | return; | |
b411b363 | 1395 | |
9f5bdc33 AG |
1396 | sock = &mdev->tconn->meta; |
1397 | p = drbd_prepare_command(mdev, sock); | |
1398 | if (!p) | |
1399 | return; | |
1400 | p->barrier = barrier_nr; | |
1401 | p->set_size = cpu_to_be32(set_size); | |
1402 | drbd_send_command(mdev, sock, P_BARRIER_ACK, sizeof(*p), NULL, 0); | |
b411b363 PR |
1403 | } |
1404 | ||
1405 | /** | |
1406 | * _drbd_send_ack() - Sends an ack packet | |
1407 | * @mdev: DRBD device. | |
1408 | * @cmd: Packet command code. | |
1409 | * @sector: sector, needs to be in big endian byte order | |
1410 | * @blksize: size in byte, needs to be in big endian byte order | |
1411 | * @block_id: Id, big endian byte order | |
1412 | */ | |
d8763023 AG |
1413 | static int _drbd_send_ack(struct drbd_conf *mdev, enum drbd_packet cmd, |
1414 | u64 sector, u32 blksize, u64 block_id) | |
b411b363 | 1415 | { |
9f5bdc33 AG |
1416 | struct drbd_socket *sock; |
1417 | struct p_block_ack *p; | |
b411b363 | 1418 | |
9f5bdc33 AG |
1419 | if (mdev->state.conn < C_CONNECTED) |
1420 | return -EIO; | |
b411b363 | 1421 | |
9f5bdc33 AG |
1422 | sock = &mdev->tconn->meta; |
1423 | p = drbd_prepare_command(mdev, sock); | |
1424 | if (!p) | |
a8c32aa8 | 1425 | return -EIO; |
9f5bdc33 AG |
1426 | p->sector = sector; |
1427 | p->block_id = block_id; | |
1428 | p->blksize = blksize; | |
1429 | p->seq_num = cpu_to_be32(atomic_inc_return(&mdev->packet_seq)); | |
1430 | return drbd_send_command(mdev, sock, cmd, sizeof(*p), NULL, 0); | |
b411b363 PR |
1431 | } |
1432 | ||
2b2bf214 LE |
1433 | /* dp->sector and dp->block_id already/still in network byte order, |
1434 | * data_size is payload size according to dp->head, | |
1435 | * and may need to be corrected for digest size. */ | |
a9a9994d AG |
1436 | void drbd_send_ack_dp(struct drbd_conf *mdev, enum drbd_packet cmd, |
1437 | struct p_data *dp, int data_size) | |
b411b363 | 1438 | { |
88104ca4 AG |
1439 | if (mdev->tconn->peer_integrity_tfm) |
1440 | data_size -= crypto_hash_digestsize(mdev->tconn->peer_integrity_tfm); | |
a9a9994d AG |
1441 | _drbd_send_ack(mdev, cmd, dp->sector, cpu_to_be32(data_size), |
1442 | dp->block_id); | |
b411b363 PR |
1443 | } |
1444 | ||
a9a9994d AG |
1445 | void drbd_send_ack_rp(struct drbd_conf *mdev, enum drbd_packet cmd, |
1446 | struct p_block_req *rp) | |
b411b363 | 1447 | { |
a9a9994d | 1448 | _drbd_send_ack(mdev, cmd, rp->sector, rp->blksize, rp->block_id); |
b411b363 PR |
1449 | } |
1450 | ||
1451 | /** | |
1452 | * drbd_send_ack() - Sends an ack packet | |
db830c46 AG |
1453 | * @mdev: DRBD device |
1454 | * @cmd: packet command code | |
1455 | * @peer_req: peer request | |
b411b363 | 1456 | */ |
d8763023 | 1457 | int drbd_send_ack(struct drbd_conf *mdev, enum drbd_packet cmd, |
db830c46 | 1458 | struct drbd_peer_request *peer_req) |
b411b363 | 1459 | { |
dd516121 AG |
1460 | return _drbd_send_ack(mdev, cmd, |
1461 | cpu_to_be64(peer_req->i.sector), | |
1462 | cpu_to_be32(peer_req->i.size), | |
1463 | peer_req->block_id); | |
b411b363 PR |
1464 | } |
1465 | ||
1466 | /* This function misuses the block_id field to signal if the blocks | |
1467 | * are is sync or not. */ | |
d8763023 | 1468 | int drbd_send_ack_ex(struct drbd_conf *mdev, enum drbd_packet cmd, |
b411b363 PR |
1469 | sector_t sector, int blksize, u64 block_id) |
1470 | { | |
fa79abd8 AG |
1471 | return _drbd_send_ack(mdev, cmd, |
1472 | cpu_to_be64(sector), | |
1473 | cpu_to_be32(blksize), | |
1474 | cpu_to_be64(block_id)); | |
b411b363 PR |
1475 | } |
1476 | ||
1477 | int drbd_send_drequest(struct drbd_conf *mdev, int cmd, | |
1478 | sector_t sector, int size, u64 block_id) | |
1479 | { | |
9f5bdc33 AG |
1480 | struct drbd_socket *sock; |
1481 | struct p_block_req *p; | |
b411b363 | 1482 | |
9f5bdc33 AG |
1483 | sock = &mdev->tconn->data; |
1484 | p = drbd_prepare_command(mdev, sock); | |
1485 | if (!p) | |
1486 | return -EIO; | |
1487 | p->sector = cpu_to_be64(sector); | |
1488 | p->block_id = block_id; | |
1489 | p->blksize = cpu_to_be32(size); | |
1490 | return drbd_send_command(mdev, sock, cmd, sizeof(*p), NULL, 0); | |
b411b363 PR |
1491 | } |
1492 | ||
d8763023 AG |
1493 | int drbd_send_drequest_csum(struct drbd_conf *mdev, sector_t sector, int size, |
1494 | void *digest, int digest_size, enum drbd_packet cmd) | |
b411b363 | 1495 | { |
9f5bdc33 AG |
1496 | struct drbd_socket *sock; |
1497 | struct p_block_req *p; | |
b411b363 | 1498 | |
9f5bdc33 | 1499 | /* FIXME: Put the digest into the preallocated socket buffer. */ |
b411b363 | 1500 | |
9f5bdc33 AG |
1501 | sock = &mdev->tconn->data; |
1502 | p = drbd_prepare_command(mdev, sock); | |
1503 | if (!p) | |
1504 | return -EIO; | |
1505 | p->sector = cpu_to_be64(sector); | |
1506 | p->block_id = ID_SYNCER /* unused */; | |
1507 | p->blksize = cpu_to_be32(size); | |
1508 | return drbd_send_command(mdev, sock, cmd, sizeof(*p), | |
1509 | digest, digest_size); | |
b411b363 PR |
1510 | } |
1511 | ||
1512 | int drbd_send_ov_request(struct drbd_conf *mdev, sector_t sector, int size) | |
1513 | { | |
9f5bdc33 AG |
1514 | struct drbd_socket *sock; |
1515 | struct p_block_req *p; | |
b411b363 | 1516 | |
9f5bdc33 AG |
1517 | sock = &mdev->tconn->data; |
1518 | p = drbd_prepare_command(mdev, sock); | |
1519 | if (!p) | |
1520 | return -EIO; | |
1521 | p->sector = cpu_to_be64(sector); | |
1522 | p->block_id = ID_SYNCER /* unused */; | |
1523 | p->blksize = cpu_to_be32(size); | |
1524 | return drbd_send_command(mdev, sock, P_OV_REQUEST, sizeof(*p), NULL, 0); | |
b411b363 PR |
1525 | } |
1526 | ||
1527 | /* called on sndtimeo | |
81e84650 AG |
1528 | * returns false if we should retry, |
1529 | * true if we think connection is dead | |
b411b363 | 1530 | */ |
1a7ba646 | 1531 | static int we_should_drop_the_connection(struct drbd_tconn *tconn, struct socket *sock) |
b411b363 PR |
1532 | { |
1533 | int drop_it; | |
1534 | /* long elapsed = (long)(jiffies - mdev->last_received); */ | |
1535 | ||
1a7ba646 PR |
1536 | drop_it = tconn->meta.socket == sock |
1537 | || !tconn->asender.task | |
1538 | || get_t_state(&tconn->asender) != RUNNING | |
bbeb641c | 1539 | || tconn->cstate < C_WF_REPORT_PARAMS; |
b411b363 PR |
1540 | |
1541 | if (drop_it) | |
81e84650 | 1542 | return true; |
b411b363 | 1543 | |
1a7ba646 | 1544 | drop_it = !--tconn->ko_count; |
b411b363 | 1545 | if (!drop_it) { |
1a7ba646 PR |
1546 | conn_err(tconn, "[%s/%d] sock_sendmsg time expired, ko = %u\n", |
1547 | current->comm, current->pid, tconn->ko_count); | |
1548 | request_ping(tconn); | |
b411b363 PR |
1549 | } |
1550 | ||
1551 | return drop_it; /* && (mdev->state == R_PRIMARY) */; | |
1552 | } | |
1553 | ||
1a7ba646 | 1554 | static void drbd_update_congested(struct drbd_tconn *tconn) |
9e204cdd | 1555 | { |
1a7ba646 | 1556 | struct sock *sk = tconn->data.socket->sk; |
9e204cdd | 1557 | if (sk->sk_wmem_queued > sk->sk_sndbuf * 4 / 5) |
1a7ba646 | 1558 | set_bit(NET_CONGESTED, &tconn->flags); |
9e204cdd AG |
1559 | } |
1560 | ||
b411b363 PR |
1561 | /* The idea of sendpage seems to be to put some kind of reference |
1562 | * to the page into the skb, and to hand it over to the NIC. In | |
1563 | * this process get_page() gets called. | |
1564 | * | |
1565 | * As soon as the page was really sent over the network put_page() | |
1566 | * gets called by some part of the network layer. [ NIC driver? ] | |
1567 | * | |
1568 | * [ get_page() / put_page() increment/decrement the count. If count | |
1569 | * reaches 0 the page will be freed. ] | |
1570 | * | |
1571 | * This works nicely with pages from FSs. | |
1572 | * But this means that in protocol A we might signal IO completion too early! | |
1573 | * | |
1574 | * In order not to corrupt data during a resync we must make sure | |
1575 | * that we do not reuse our own buffer pages (EEs) to early, therefore | |
1576 | * we have the net_ee list. | |
1577 | * | |
1578 | * XFS seems to have problems, still, it submits pages with page_count == 0! | |
1579 | * As a workaround, we disable sendpage on pages | |
1580 | * with page_count == 0 or PageSlab. | |
1581 | */ | |
1582 | static int _drbd_no_send_page(struct drbd_conf *mdev, struct page *page, | |
b987427b | 1583 | int offset, size_t size, unsigned msg_flags) |
b411b363 | 1584 | { |
b987427b AG |
1585 | struct socket *socket; |
1586 | void *addr; | |
1587 | int err; | |
1588 | ||
1589 | socket = mdev->tconn->data.socket; | |
1590 | addr = kmap(page) + offset; | |
1591 | err = drbd_send_all(mdev->tconn, socket, addr, size, msg_flags); | |
b411b363 | 1592 | kunmap(page); |
b987427b AG |
1593 | if (!err) |
1594 | mdev->send_cnt += size >> 9; | |
1595 | return err; | |
b411b363 PR |
1596 | } |
1597 | ||
1598 | static int _drbd_send_page(struct drbd_conf *mdev, struct page *page, | |
ba11ad9a | 1599 | int offset, size_t size, unsigned msg_flags) |
b411b363 | 1600 | { |
88b390ff | 1601 | struct socket *socket = mdev->tconn->data.socket; |
b411b363 | 1602 | mm_segment_t oldfs = get_fs(); |
b411b363 | 1603 | int len = size; |
88b390ff | 1604 | int err = -EIO; |
b411b363 PR |
1605 | |
1606 | /* e.g. XFS meta- & log-data is in slab pages, which have a | |
1607 | * page_count of 0 and/or have PageSlab() set. | |
1608 | * we cannot use send_page for those, as that does get_page(); | |
1609 | * put_page(); and would cause either a VM_BUG directly, or | |
1610 | * __page_cache_release a page that would actually still be referenced | |
1611 | * by someone, leading to some obscure delayed Oops somewhere else. */ | |
1612 | if (disable_sendpage || (page_count(page) < 1) || PageSlab(page)) | |
88b390ff | 1613 | return _drbd_no_send_page(mdev, page, offset, size, msg_flags); |
b411b363 | 1614 | |
ba11ad9a | 1615 | msg_flags |= MSG_NOSIGNAL; |
1a7ba646 | 1616 | drbd_update_congested(mdev->tconn); |
b411b363 PR |
1617 | set_fs(KERNEL_DS); |
1618 | do { | |
88b390ff AG |
1619 | int sent; |
1620 | ||
1621 | sent = socket->ops->sendpage(socket, page, offset, len, msg_flags); | |
b411b363 | 1622 | if (sent <= 0) { |
88b390ff AG |
1623 | if (sent == -EAGAIN) { |
1624 | if (we_should_drop_the_connection(mdev->tconn, socket)) | |
1625 | break; | |
1626 | continue; | |
1627 | } | |
b411b363 PR |
1628 | dev_warn(DEV, "%s: size=%d len=%d sent=%d\n", |
1629 | __func__, (int)size, len, sent); | |
88b390ff AG |
1630 | if (sent < 0) |
1631 | err = sent; | |
b411b363 PR |
1632 | break; |
1633 | } | |
1634 | len -= sent; | |
1635 | offset += sent; | |
1636 | } while (len > 0 /* THINK && mdev->cstate >= C_CONNECTED*/); | |
1637 | set_fs(oldfs); | |
01a311a5 | 1638 | clear_bit(NET_CONGESTED, &mdev->tconn->flags); |
b411b363 | 1639 | |
88b390ff AG |
1640 | if (len == 0) { |
1641 | err = 0; | |
1642 | mdev->send_cnt += size >> 9; | |
1643 | } | |
1644 | return err; | |
b411b363 PR |
1645 | } |
1646 | ||
1647 | static int _drbd_send_bio(struct drbd_conf *mdev, struct bio *bio) | |
1648 | { | |
1649 | struct bio_vec *bvec; | |
1650 | int i; | |
ba11ad9a | 1651 | /* hint all but last page with MSG_MORE */ |
b411b363 | 1652 | __bio_for_each_segment(bvec, bio, i, 0) { |
7fae55da AG |
1653 | int err; |
1654 | ||
1655 | err = _drbd_no_send_page(mdev, bvec->bv_page, | |
1656 | bvec->bv_offset, bvec->bv_len, | |
1657 | i == bio->bi_vcnt - 1 ? 0 : MSG_MORE); | |
1658 | if (err) | |
1659 | return err; | |
b411b363 | 1660 | } |
7fae55da | 1661 | return 0; |
b411b363 PR |
1662 | } |
1663 | ||
1664 | static int _drbd_send_zc_bio(struct drbd_conf *mdev, struct bio *bio) | |
1665 | { | |
1666 | struct bio_vec *bvec; | |
1667 | int i; | |
ba11ad9a | 1668 | /* hint all but last page with MSG_MORE */ |
b411b363 | 1669 | __bio_for_each_segment(bvec, bio, i, 0) { |
7fae55da AG |
1670 | int err; |
1671 | ||
1672 | err = _drbd_send_page(mdev, bvec->bv_page, | |
1673 | bvec->bv_offset, bvec->bv_len, | |
1674 | i == bio->bi_vcnt - 1 ? 0 : MSG_MORE); | |
1675 | if (err) | |
1676 | return err; | |
b411b363 | 1677 | } |
7fae55da | 1678 | return 0; |
b411b363 PR |
1679 | } |
1680 | ||
db830c46 AG |
1681 | static int _drbd_send_zc_ee(struct drbd_conf *mdev, |
1682 | struct drbd_peer_request *peer_req) | |
45bb912b | 1683 | { |
db830c46 AG |
1684 | struct page *page = peer_req->pages; |
1685 | unsigned len = peer_req->i.size; | |
9f69230c | 1686 | int err; |
db830c46 | 1687 | |
ba11ad9a | 1688 | /* hint all but last page with MSG_MORE */ |
45bb912b LE |
1689 | page_chain_for_each(page) { |
1690 | unsigned l = min_t(unsigned, len, PAGE_SIZE); | |
9f69230c AG |
1691 | |
1692 | err = _drbd_send_page(mdev, page, 0, l, | |
1693 | page_chain_next(page) ? MSG_MORE : 0); | |
1694 | if (err) | |
1695 | return err; | |
45bb912b LE |
1696 | len -= l; |
1697 | } | |
9f69230c | 1698 | return 0; |
45bb912b LE |
1699 | } |
1700 | ||
76d2e7ec PR |
1701 | static u32 bio_flags_to_wire(struct drbd_conf *mdev, unsigned long bi_rw) |
1702 | { | |
31890f4a | 1703 | if (mdev->tconn->agreed_pro_version >= 95) |
76d2e7ec | 1704 | return (bi_rw & REQ_SYNC ? DP_RW_SYNC : 0) | |
76d2e7ec PR |
1705 | (bi_rw & REQ_FUA ? DP_FUA : 0) | |
1706 | (bi_rw & REQ_FLUSH ? DP_FLUSH : 0) | | |
1707 | (bi_rw & REQ_DISCARD ? DP_DISCARD : 0); | |
1708 | else | |
721a9602 | 1709 | return bi_rw & REQ_SYNC ? DP_RW_SYNC : 0; |
76d2e7ec PR |
1710 | } |
1711 | ||
b411b363 PR |
1712 | /* Used to send write requests |
1713 | * R_PRIMARY -> Peer (P_DATA) | |
1714 | */ | |
1715 | int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req) | |
1716 | { | |
9f5bdc33 AG |
1717 | struct drbd_socket *sock; |
1718 | struct p_data *p; | |
b411b363 | 1719 | unsigned int dp_flags = 0; |
b411b363 | 1720 | int dgs; |
9f5bdc33 | 1721 | int err; |
b411b363 | 1722 | |
8d412fc6 AG |
1723 | dgs = (mdev->tconn->agreed_pro_version >= 87 && mdev->tconn->integrity_tfm) ? |
1724 | crypto_hash_digestsize(mdev->tconn->integrity_tfm) : 0; | |
b411b363 | 1725 | |
9f5bdc33 AG |
1726 | sock = &mdev->tconn->data; |
1727 | p = drbd_prepare_command(mdev, sock); | |
1728 | if (!p) | |
1729 | return -EIO; | |
1730 | p->sector = cpu_to_be64(req->i.sector); | |
1731 | p->block_id = (unsigned long)req; | |
1732 | p->seq_num = cpu_to_be32(req->seq_num = atomic_inc_return(&mdev->packet_seq)); | |
76d2e7ec | 1733 | dp_flags = bio_flags_to_wire(mdev, req->master_bio->bi_rw); |
b411b363 PR |
1734 | if (mdev->state.conn >= C_SYNC_SOURCE && |
1735 | mdev->state.conn <= C_PAUSED_SYNC_T) | |
1736 | dp_flags |= DP_MAY_SET_IN_SYNC; | |
303d1448 PR |
1737 | if (mdev->tconn->agreed_pro_version >= 100) { |
1738 | if (req->rq_state & RQ_EXP_RECEIVE_ACK) | |
1739 | dp_flags |= DP_SEND_RECEIVE_ACK; | |
1740 | if (req->rq_state & RQ_EXP_WRITE_ACK) | |
1741 | dp_flags |= DP_SEND_WRITE_ACK; | |
1742 | } | |
9f5bdc33 AG |
1743 | p->dp_flags = cpu_to_be32(dp_flags); |
1744 | if (dgs) | |
8d412fc6 | 1745 | drbd_csum_bio(mdev, mdev->tconn->integrity_tfm, req->master_bio, p + 1); |
9f5bdc33 | 1746 | err = __send_command(mdev->tconn, mdev->vnr, sock, P_DATA, sizeof(*p) + dgs, NULL, req->i.size); |
6bdb9b0e | 1747 | if (!err) { |
470be44a LE |
1748 | /* For protocol A, we have to memcpy the payload into |
1749 | * socket buffers, as we may complete right away | |
1750 | * as soon as we handed it over to tcp, at which point the data | |
1751 | * pages may become invalid. | |
1752 | * | |
1753 | * For data-integrity enabled, we copy it as well, so we can be | |
1754 | * sure that even if the bio pages may still be modified, it | |
1755 | * won't change the data on the wire, thus if the digest checks | |
1756 | * out ok after sending on this side, but does not fit on the | |
1757 | * receiving side, we sure have detected corruption elsewhere. | |
1758 | */ | |
303d1448 | 1759 | if (!(req->rq_state & (RQ_EXP_RECEIVE_ACK | RQ_EXP_WRITE_ACK)) || dgs) |
6bdb9b0e | 1760 | err = _drbd_send_bio(mdev, req->master_bio); |
b411b363 | 1761 | else |
6bdb9b0e | 1762 | err = _drbd_send_zc_bio(mdev, req->master_bio); |
470be44a LE |
1763 | |
1764 | /* double check digest, sometimes buffers have been modified in flight. */ | |
1765 | if (dgs > 0 && dgs <= 64) { | |
24c4830c | 1766 | /* 64 byte, 512 bit, is the largest digest size |
470be44a LE |
1767 | * currently supported in kernel crypto. */ |
1768 | unsigned char digest[64]; | |
8d412fc6 | 1769 | drbd_csum_bio(mdev, mdev->tconn->integrity_tfm, req->master_bio, digest); |
9f5bdc33 | 1770 | if (memcmp(p + 1, digest, dgs)) { |
470be44a LE |
1771 | dev_warn(DEV, |
1772 | "Digest mismatch, buffer modified by upper layers during write: %llus +%u\n", | |
ace652ac | 1773 | (unsigned long long)req->i.sector, req->i.size); |
470be44a LE |
1774 | } |
1775 | } /* else if (dgs > 64) { | |
1776 | ... Be noisy about digest too large ... | |
1777 | } */ | |
b411b363 | 1778 | } |
9f5bdc33 | 1779 | mutex_unlock(&sock->mutex); /* locked by drbd_prepare_command() */ |
bd26bfc5 | 1780 | |
6bdb9b0e | 1781 | return err; |
b411b363 PR |
1782 | } |
1783 | ||
1784 | /* answer packet, used to send data back for read requests: | |
1785 | * Peer -> (diskless) R_PRIMARY (P_DATA_REPLY) | |
1786 | * C_SYNC_SOURCE -> C_SYNC_TARGET (P_RS_DATA_REPLY) | |
1787 | */ | |
d8763023 | 1788 | int drbd_send_block(struct drbd_conf *mdev, enum drbd_packet cmd, |
db830c46 | 1789 | struct drbd_peer_request *peer_req) |
b411b363 | 1790 | { |
9f5bdc33 AG |
1791 | struct drbd_socket *sock; |
1792 | struct p_data *p; | |
7b57b89d | 1793 | int err; |
b411b363 PR |
1794 | int dgs; |
1795 | ||
8d412fc6 AG |
1796 | dgs = (mdev->tconn->agreed_pro_version >= 87 && mdev->tconn->integrity_tfm) ? |
1797 | crypto_hash_digestsize(mdev->tconn->integrity_tfm) : 0; | |
b411b363 | 1798 | |
9f5bdc33 AG |
1799 | sock = &mdev->tconn->data; |
1800 | p = drbd_prepare_command(mdev, sock); | |
1801 | if (!p) | |
1802 | return -EIO; | |
1803 | p->sector = cpu_to_be64(peer_req->i.sector); | |
1804 | p->block_id = peer_req->block_id; | |
1805 | p->seq_num = 0; /* unused */ | |
1806 | if (dgs) | |
8d412fc6 | 1807 | drbd_csum_ee(mdev, mdev->tconn->integrity_tfm, peer_req, p + 1); |
9f5bdc33 | 1808 | err = __send_command(mdev->tconn, mdev->vnr, sock, cmd, sizeof(*p) + dgs, NULL, peer_req->i.size); |
7b57b89d AG |
1809 | if (!err) |
1810 | err = _drbd_send_zc_ee(mdev, peer_req); | |
9f5bdc33 | 1811 | mutex_unlock(&sock->mutex); /* locked by drbd_prepare_command() */ |
bd26bfc5 | 1812 | |
7b57b89d | 1813 | return err; |
b411b363 PR |
1814 | } |
1815 | ||
8f7bed77 | 1816 | int drbd_send_out_of_sync(struct drbd_conf *mdev, struct drbd_request *req) |
73a01a18 | 1817 | { |
9f5bdc33 AG |
1818 | struct drbd_socket *sock; |
1819 | struct p_block_desc *p; | |
73a01a18 | 1820 | |
9f5bdc33 AG |
1821 | sock = &mdev->tconn->data; |
1822 | p = drbd_prepare_command(mdev, sock); | |
1823 | if (!p) | |
1824 | return -EIO; | |
1825 | p->sector = cpu_to_be64(req->i.sector); | |
1826 | p->blksize = cpu_to_be32(req->i.size); | |
1827 | return drbd_send_command(mdev, sock, P_OUT_OF_SYNC, sizeof(*p), NULL, 0); | |
73a01a18 PR |
1828 | } |
1829 | ||
b411b363 PR |
1830 | /* |
1831 | drbd_send distinguishes two cases: | |
1832 | ||
1833 | Packets sent via the data socket "sock" | |
1834 | and packets sent via the meta data socket "msock" | |
1835 | ||
1836 | sock msock | |
1837 | -----------------+-------------------------+------------------------------ | |
1838 | timeout conf.timeout / 2 conf.timeout / 2 | |
1839 | timeout action send a ping via msock Abort communication | |
1840 | and close all sockets | |
1841 | */ | |
1842 | ||
1843 | /* | |
1844 | * you must have down()ed the appropriate [m]sock_mutex elsewhere! | |
1845 | */ | |
bedbd2a5 | 1846 | int drbd_send(struct drbd_tconn *tconn, struct socket *sock, |
b411b363 PR |
1847 | void *buf, size_t size, unsigned msg_flags) |
1848 | { | |
1849 | struct kvec iov; | |
1850 | struct msghdr msg; | |
1851 | int rv, sent = 0; | |
1852 | ||
1853 | if (!sock) | |
c0d42c8e | 1854 | return -EBADR; |
b411b363 PR |
1855 | |
1856 | /* THINK if (signal_pending) return ... ? */ | |
1857 | ||
1858 | iov.iov_base = buf; | |
1859 | iov.iov_len = size; | |
1860 | ||
1861 | msg.msg_name = NULL; | |
1862 | msg.msg_namelen = 0; | |
1863 | msg.msg_control = NULL; | |
1864 | msg.msg_controllen = 0; | |
1865 | msg.msg_flags = msg_flags | MSG_NOSIGNAL; | |
1866 | ||
bedbd2a5 | 1867 | if (sock == tconn->data.socket) { |
44ed167d PR |
1868 | rcu_read_lock(); |
1869 | tconn->ko_count = rcu_dereference(tconn->net_conf)->ko_count; | |
1870 | rcu_read_unlock(); | |
bedbd2a5 | 1871 | drbd_update_congested(tconn); |
b411b363 PR |
1872 | } |
1873 | do { | |
1874 | /* STRANGE | |
1875 | * tcp_sendmsg does _not_ use its size parameter at all ? | |
1876 | * | |
1877 | * -EAGAIN on timeout, -EINTR on signal. | |
1878 | */ | |
1879 | /* THINK | |
1880 | * do we need to block DRBD_SIG if sock == &meta.socket ?? | |
1881 | * otherwise wake_asender() might interrupt some send_*Ack ! | |
1882 | */ | |
1883 | rv = kernel_sendmsg(sock, &msg, &iov, 1, size); | |
1884 | if (rv == -EAGAIN) { | |
bedbd2a5 | 1885 | if (we_should_drop_the_connection(tconn, sock)) |
b411b363 PR |
1886 | break; |
1887 | else | |
1888 | continue; | |
1889 | } | |
b411b363 PR |
1890 | if (rv == -EINTR) { |
1891 | flush_signals(current); | |
1892 | rv = 0; | |
1893 | } | |
1894 | if (rv < 0) | |
1895 | break; | |
1896 | sent += rv; | |
1897 | iov.iov_base += rv; | |
1898 | iov.iov_len -= rv; | |
1899 | } while (sent < size); | |
1900 | ||
bedbd2a5 PR |
1901 | if (sock == tconn->data.socket) |
1902 | clear_bit(NET_CONGESTED, &tconn->flags); | |
b411b363 PR |
1903 | |
1904 | if (rv <= 0) { | |
1905 | if (rv != -EAGAIN) { | |
bedbd2a5 PR |
1906 | conn_err(tconn, "%s_sendmsg returned %d\n", |
1907 | sock == tconn->meta.socket ? "msock" : "sock", | |
1908 | rv); | |
bbeb641c | 1909 | conn_request_state(tconn, NS(conn, C_BROKEN_PIPE), CS_HARD); |
b411b363 | 1910 | } else |
bbeb641c | 1911 | conn_request_state(tconn, NS(conn, C_TIMEOUT), CS_HARD); |
b411b363 PR |
1912 | } |
1913 | ||
1914 | return sent; | |
1915 | } | |
1916 | ||
fb708e40 AG |
1917 | /** |
1918 | * drbd_send_all - Send an entire buffer | |
1919 | * | |
1920 | * Returns 0 upon success and a negative error value otherwise. | |
1921 | */ | |
1922 | int drbd_send_all(struct drbd_tconn *tconn, struct socket *sock, void *buffer, | |
1923 | size_t size, unsigned msg_flags) | |
1924 | { | |
1925 | int err; | |
1926 | ||
1927 | err = drbd_send(tconn, sock, buffer, size, msg_flags); | |
1928 | if (err < 0) | |
1929 | return err; | |
1930 | if (err != size) | |
1931 | return -EIO; | |
1932 | return 0; | |
1933 | } | |
1934 | ||
b411b363 PR |
1935 | static int drbd_open(struct block_device *bdev, fmode_t mode) |
1936 | { | |
1937 | struct drbd_conf *mdev = bdev->bd_disk->private_data; | |
1938 | unsigned long flags; | |
1939 | int rv = 0; | |
1940 | ||
2a48fc0a | 1941 | mutex_lock(&drbd_main_mutex); |
87eeee41 | 1942 | spin_lock_irqsave(&mdev->tconn->req_lock, flags); |
b411b363 PR |
1943 | /* to have a stable mdev->state.role |
1944 | * and no race with updating open_cnt */ | |
1945 | ||
1946 | if (mdev->state.role != R_PRIMARY) { | |
1947 | if (mode & FMODE_WRITE) | |
1948 | rv = -EROFS; | |
1949 | else if (!allow_oos) | |
1950 | rv = -EMEDIUMTYPE; | |
1951 | } | |
1952 | ||
1953 | if (!rv) | |
1954 | mdev->open_cnt++; | |
87eeee41 | 1955 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); |
2a48fc0a | 1956 | mutex_unlock(&drbd_main_mutex); |
b411b363 PR |
1957 | |
1958 | return rv; | |
1959 | } | |
1960 | ||
1961 | static int drbd_release(struct gendisk *gd, fmode_t mode) | |
1962 | { | |
1963 | struct drbd_conf *mdev = gd->private_data; | |
2a48fc0a | 1964 | mutex_lock(&drbd_main_mutex); |
b411b363 | 1965 | mdev->open_cnt--; |
2a48fc0a | 1966 | mutex_unlock(&drbd_main_mutex); |
b411b363 PR |
1967 | return 0; |
1968 | } | |
1969 | ||
b411b363 PR |
1970 | static void drbd_set_defaults(struct drbd_conf *mdev) |
1971 | { | |
f399002e LE |
1972 | /* Beware! The actual layout differs |
1973 | * between big endian and little endian */ | |
da9fbc27 | 1974 | mdev->state = (union drbd_dev_state) { |
b411b363 PR |
1975 | { .role = R_SECONDARY, |
1976 | .peer = R_UNKNOWN, | |
1977 | .conn = C_STANDALONE, | |
1978 | .disk = D_DISKLESS, | |
1979 | .pdsk = D_UNKNOWN, | |
b411b363 PR |
1980 | } }; |
1981 | } | |
1982 | ||
1983 | void drbd_init_set_defaults(struct drbd_conf *mdev) | |
1984 | { | |
1985 | /* the memset(,0,) did most of this. | |
1986 | * note: only assignments, no allocation in here */ | |
1987 | ||
1988 | drbd_set_defaults(mdev); | |
1989 | ||
b411b363 PR |
1990 | atomic_set(&mdev->ap_bio_cnt, 0); |
1991 | atomic_set(&mdev->ap_pending_cnt, 0); | |
1992 | atomic_set(&mdev->rs_pending_cnt, 0); | |
1993 | atomic_set(&mdev->unacked_cnt, 0); | |
1994 | atomic_set(&mdev->local_cnt, 0); | |
435f0740 | 1995 | atomic_set(&mdev->pp_in_use_by_net, 0); |
778f271d | 1996 | atomic_set(&mdev->rs_sect_in, 0); |
0f0601f4 | 1997 | atomic_set(&mdev->rs_sect_ev, 0); |
759fbdfb | 1998 | atomic_set(&mdev->ap_in_flight, 0); |
b411b363 PR |
1999 | |
2000 | mutex_init(&mdev->md_io_mutex); | |
8410da8f PR |
2001 | mutex_init(&mdev->own_state_mutex); |
2002 | mdev->state_mutex = &mdev->own_state_mutex; | |
b411b363 | 2003 | |
b411b363 | 2004 | spin_lock_init(&mdev->al_lock); |
b411b363 PR |
2005 | spin_lock_init(&mdev->peer_seq_lock); |
2006 | spin_lock_init(&mdev->epoch_lock); | |
2007 | ||
2008 | INIT_LIST_HEAD(&mdev->active_ee); | |
2009 | INIT_LIST_HEAD(&mdev->sync_ee); | |
2010 | INIT_LIST_HEAD(&mdev->done_ee); | |
2011 | INIT_LIST_HEAD(&mdev->read_ee); | |
2012 | INIT_LIST_HEAD(&mdev->net_ee); | |
2013 | INIT_LIST_HEAD(&mdev->resync_reads); | |
b411b363 PR |
2014 | INIT_LIST_HEAD(&mdev->resync_work.list); |
2015 | INIT_LIST_HEAD(&mdev->unplug_work.list); | |
e9e6f3ec | 2016 | INIT_LIST_HEAD(&mdev->go_diskless.list); |
b411b363 | 2017 | INIT_LIST_HEAD(&mdev->md_sync_work.list); |
c4752ef1 | 2018 | INIT_LIST_HEAD(&mdev->start_resync_work.list); |
b411b363 | 2019 | INIT_LIST_HEAD(&mdev->bm_io_work.w.list); |
0ced55a3 | 2020 | |
794abb75 | 2021 | mdev->resync_work.cb = w_resync_timer; |
b411b363 | 2022 | mdev->unplug_work.cb = w_send_write_hint; |
e9e6f3ec | 2023 | mdev->go_diskless.cb = w_go_diskless; |
b411b363 PR |
2024 | mdev->md_sync_work.cb = w_md_sync; |
2025 | mdev->bm_io_work.w.cb = w_bitmap_io; | |
370a43e7 | 2026 | mdev->start_resync_work.cb = w_start_resync; |
a21e9298 PR |
2027 | |
2028 | mdev->resync_work.mdev = mdev; | |
2029 | mdev->unplug_work.mdev = mdev; | |
2030 | mdev->go_diskless.mdev = mdev; | |
2031 | mdev->md_sync_work.mdev = mdev; | |
2032 | mdev->bm_io_work.w.mdev = mdev; | |
2033 | mdev->start_resync_work.mdev = mdev; | |
2034 | ||
b411b363 PR |
2035 | init_timer(&mdev->resync_timer); |
2036 | init_timer(&mdev->md_sync_timer); | |
370a43e7 | 2037 | init_timer(&mdev->start_resync_timer); |
7fde2be9 | 2038 | init_timer(&mdev->request_timer); |
b411b363 PR |
2039 | mdev->resync_timer.function = resync_timer_fn; |
2040 | mdev->resync_timer.data = (unsigned long) mdev; | |
2041 | mdev->md_sync_timer.function = md_sync_timer_fn; | |
2042 | mdev->md_sync_timer.data = (unsigned long) mdev; | |
370a43e7 PR |
2043 | mdev->start_resync_timer.function = start_resync_timer_fn; |
2044 | mdev->start_resync_timer.data = (unsigned long) mdev; | |
7fde2be9 PR |
2045 | mdev->request_timer.function = request_timer_fn; |
2046 | mdev->request_timer.data = (unsigned long) mdev; | |
b411b363 PR |
2047 | |
2048 | init_waitqueue_head(&mdev->misc_wait); | |
2049 | init_waitqueue_head(&mdev->state_wait); | |
2050 | init_waitqueue_head(&mdev->ee_wait); | |
2051 | init_waitqueue_head(&mdev->al_wait); | |
2052 | init_waitqueue_head(&mdev->seq_wait); | |
2053 | ||
2451fc3b | 2054 | mdev->write_ordering = WO_bdev_flush; |
b411b363 | 2055 | mdev->resync_wenr = LC_FREE; |
99432fcc PR |
2056 | mdev->peer_max_bio_size = DRBD_MAX_BIO_SIZE_SAFE; |
2057 | mdev->local_max_bio_size = DRBD_MAX_BIO_SIZE_SAFE; | |
b411b363 PR |
2058 | } |
2059 | ||
2060 | void drbd_mdev_cleanup(struct drbd_conf *mdev) | |
2061 | { | |
1d7734a0 | 2062 | int i; |
e6b3ea83 | 2063 | if (mdev->tconn->receiver.t_state != NONE) |
b411b363 | 2064 | dev_err(DEV, "ASSERT FAILED: receiver t_state == %d expected 0.\n", |
e6b3ea83 | 2065 | mdev->tconn->receiver.t_state); |
b411b363 PR |
2066 | |
2067 | /* no need to lock it, I'm the only thread alive */ | |
2068 | if (atomic_read(&mdev->current_epoch->epoch_size) != 0) | |
2069 | dev_err(DEV, "epoch_size:%d\n", atomic_read(&mdev->current_epoch->epoch_size)); | |
2070 | mdev->al_writ_cnt = | |
2071 | mdev->bm_writ_cnt = | |
2072 | mdev->read_cnt = | |
2073 | mdev->recv_cnt = | |
2074 | mdev->send_cnt = | |
2075 | mdev->writ_cnt = | |
2076 | mdev->p_size = | |
2077 | mdev->rs_start = | |
2078 | mdev->rs_total = | |
1d7734a0 LE |
2079 | mdev->rs_failed = 0; |
2080 | mdev->rs_last_events = 0; | |
0f0601f4 | 2081 | mdev->rs_last_sect_ev = 0; |
1d7734a0 LE |
2082 | for (i = 0; i < DRBD_SYNC_MARKS; i++) { |
2083 | mdev->rs_mark_left[i] = 0; | |
2084 | mdev->rs_mark_time[i] = 0; | |
2085 | } | |
89e58e75 | 2086 | D_ASSERT(mdev->tconn->net_conf == NULL); |
b411b363 PR |
2087 | |
2088 | drbd_set_my_capacity(mdev, 0); | |
2089 | if (mdev->bitmap) { | |
2090 | /* maybe never allocated. */ | |
02d9a94b | 2091 | drbd_bm_resize(mdev, 0, 1); |
b411b363 PR |
2092 | drbd_bm_cleanup(mdev); |
2093 | } | |
2094 | ||
1d041225 PR |
2095 | drbd_free_bc(mdev->ldev); |
2096 | mdev->ldev = NULL; | |
2097 | ||
0778286a | 2098 | clear_bit(AL_SUSPENDED, &mdev->flags); |
b411b363 | 2099 | |
b411b363 PR |
2100 | D_ASSERT(list_empty(&mdev->active_ee)); |
2101 | D_ASSERT(list_empty(&mdev->sync_ee)); | |
2102 | D_ASSERT(list_empty(&mdev->done_ee)); | |
2103 | D_ASSERT(list_empty(&mdev->read_ee)); | |
2104 | D_ASSERT(list_empty(&mdev->net_ee)); | |
2105 | D_ASSERT(list_empty(&mdev->resync_reads)); | |
e42325a5 PR |
2106 | D_ASSERT(list_empty(&mdev->tconn->data.work.q)); |
2107 | D_ASSERT(list_empty(&mdev->tconn->meta.work.q)); | |
b411b363 PR |
2108 | D_ASSERT(list_empty(&mdev->resync_work.list)); |
2109 | D_ASSERT(list_empty(&mdev->unplug_work.list)); | |
e9e6f3ec | 2110 | D_ASSERT(list_empty(&mdev->go_diskless.list)); |
2265b473 LE |
2111 | |
2112 | drbd_set_defaults(mdev); | |
b411b363 PR |
2113 | } |
2114 | ||
2115 | ||
2116 | static void drbd_destroy_mempools(void) | |
2117 | { | |
2118 | struct page *page; | |
2119 | ||
2120 | while (drbd_pp_pool) { | |
2121 | page = drbd_pp_pool; | |
2122 | drbd_pp_pool = (struct page *)page_private(page); | |
2123 | __free_page(page); | |
2124 | drbd_pp_vacant--; | |
2125 | } | |
2126 | ||
2127 | /* D_ASSERT(atomic_read(&drbd_pp_vacant)==0); */ | |
2128 | ||
da4a75d2 LE |
2129 | if (drbd_md_io_bio_set) |
2130 | bioset_free(drbd_md_io_bio_set); | |
35abf594 LE |
2131 | if (drbd_md_io_page_pool) |
2132 | mempool_destroy(drbd_md_io_page_pool); | |
b411b363 PR |
2133 | if (drbd_ee_mempool) |
2134 | mempool_destroy(drbd_ee_mempool); | |
2135 | if (drbd_request_mempool) | |
2136 | mempool_destroy(drbd_request_mempool); | |
2137 | if (drbd_ee_cache) | |
2138 | kmem_cache_destroy(drbd_ee_cache); | |
2139 | if (drbd_request_cache) | |
2140 | kmem_cache_destroy(drbd_request_cache); | |
2141 | if (drbd_bm_ext_cache) | |
2142 | kmem_cache_destroy(drbd_bm_ext_cache); | |
2143 | if (drbd_al_ext_cache) | |
2144 | kmem_cache_destroy(drbd_al_ext_cache); | |
2145 | ||
da4a75d2 | 2146 | drbd_md_io_bio_set = NULL; |
35abf594 | 2147 | drbd_md_io_page_pool = NULL; |
b411b363 PR |
2148 | drbd_ee_mempool = NULL; |
2149 | drbd_request_mempool = NULL; | |
2150 | drbd_ee_cache = NULL; | |
2151 | drbd_request_cache = NULL; | |
2152 | drbd_bm_ext_cache = NULL; | |
2153 | drbd_al_ext_cache = NULL; | |
2154 | ||
2155 | return; | |
2156 | } | |
2157 | ||
2158 | static int drbd_create_mempools(void) | |
2159 | { | |
2160 | struct page *page; | |
1816a2b4 | 2161 | const int number = (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * minor_count; |
b411b363 PR |
2162 | int i; |
2163 | ||
2164 | /* prepare our caches and mempools */ | |
2165 | drbd_request_mempool = NULL; | |
2166 | drbd_ee_cache = NULL; | |
2167 | drbd_request_cache = NULL; | |
2168 | drbd_bm_ext_cache = NULL; | |
2169 | drbd_al_ext_cache = NULL; | |
2170 | drbd_pp_pool = NULL; | |
35abf594 | 2171 | drbd_md_io_page_pool = NULL; |
da4a75d2 | 2172 | drbd_md_io_bio_set = NULL; |
b411b363 PR |
2173 | |
2174 | /* caches */ | |
2175 | drbd_request_cache = kmem_cache_create( | |
2176 | "drbd_req", sizeof(struct drbd_request), 0, 0, NULL); | |
2177 | if (drbd_request_cache == NULL) | |
2178 | goto Enomem; | |
2179 | ||
2180 | drbd_ee_cache = kmem_cache_create( | |
f6ffca9f | 2181 | "drbd_ee", sizeof(struct drbd_peer_request), 0, 0, NULL); |
b411b363 PR |
2182 | if (drbd_ee_cache == NULL) |
2183 | goto Enomem; | |
2184 | ||
2185 | drbd_bm_ext_cache = kmem_cache_create( | |
2186 | "drbd_bm", sizeof(struct bm_extent), 0, 0, NULL); | |
2187 | if (drbd_bm_ext_cache == NULL) | |
2188 | goto Enomem; | |
2189 | ||
2190 | drbd_al_ext_cache = kmem_cache_create( | |
2191 | "drbd_al", sizeof(struct lc_element), 0, 0, NULL); | |
2192 | if (drbd_al_ext_cache == NULL) | |
2193 | goto Enomem; | |
2194 | ||
2195 | /* mempools */ | |
da4a75d2 LE |
2196 | drbd_md_io_bio_set = bioset_create(DRBD_MIN_POOL_PAGES, 0); |
2197 | if (drbd_md_io_bio_set == NULL) | |
2198 | goto Enomem; | |
2199 | ||
35abf594 LE |
2200 | drbd_md_io_page_pool = mempool_create_page_pool(DRBD_MIN_POOL_PAGES, 0); |
2201 | if (drbd_md_io_page_pool == NULL) | |
2202 | goto Enomem; | |
2203 | ||
b411b363 PR |
2204 | drbd_request_mempool = mempool_create(number, |
2205 | mempool_alloc_slab, mempool_free_slab, drbd_request_cache); | |
2206 | if (drbd_request_mempool == NULL) | |
2207 | goto Enomem; | |
2208 | ||
2209 | drbd_ee_mempool = mempool_create(number, | |
2210 | mempool_alloc_slab, mempool_free_slab, drbd_ee_cache); | |
2027ae1f | 2211 | if (drbd_ee_mempool == NULL) |
b411b363 PR |
2212 | goto Enomem; |
2213 | ||
2214 | /* drbd's page pool */ | |
2215 | spin_lock_init(&drbd_pp_lock); | |
2216 | ||
2217 | for (i = 0; i < number; i++) { | |
2218 | page = alloc_page(GFP_HIGHUSER); | |
2219 | if (!page) | |
2220 | goto Enomem; | |
2221 | set_page_private(page, (unsigned long)drbd_pp_pool); | |
2222 | drbd_pp_pool = page; | |
2223 | } | |
2224 | drbd_pp_vacant = number; | |
2225 | ||
2226 | return 0; | |
2227 | ||
2228 | Enomem: | |
2229 | drbd_destroy_mempools(); /* in case we allocated some */ | |
2230 | return -ENOMEM; | |
2231 | } | |
2232 | ||
2233 | static int drbd_notify_sys(struct notifier_block *this, unsigned long code, | |
2234 | void *unused) | |
2235 | { | |
2236 | /* just so we have it. you never know what interesting things we | |
2237 | * might want to do here some day... | |
2238 | */ | |
2239 | ||
2240 | return NOTIFY_DONE; | |
2241 | } | |
2242 | ||
2243 | static struct notifier_block drbd_notifier = { | |
2244 | .notifier_call = drbd_notify_sys, | |
2245 | }; | |
2246 | ||
7721f567 | 2247 | static void drbd_release_all_peer_reqs(struct drbd_conf *mdev) |
b411b363 PR |
2248 | { |
2249 | int rr; | |
2250 | ||
7721f567 | 2251 | rr = drbd_free_peer_reqs(mdev, &mdev->active_ee); |
b411b363 PR |
2252 | if (rr) |
2253 | dev_err(DEV, "%d EEs in active list found!\n", rr); | |
2254 | ||
7721f567 | 2255 | rr = drbd_free_peer_reqs(mdev, &mdev->sync_ee); |
b411b363 PR |
2256 | if (rr) |
2257 | dev_err(DEV, "%d EEs in sync list found!\n", rr); | |
2258 | ||
7721f567 | 2259 | rr = drbd_free_peer_reqs(mdev, &mdev->read_ee); |
b411b363 PR |
2260 | if (rr) |
2261 | dev_err(DEV, "%d EEs in read list found!\n", rr); | |
2262 | ||
7721f567 | 2263 | rr = drbd_free_peer_reqs(mdev, &mdev->done_ee); |
b411b363 PR |
2264 | if (rr) |
2265 | dev_err(DEV, "%d EEs in done list found!\n", rr); | |
2266 | ||
7721f567 | 2267 | rr = drbd_free_peer_reqs(mdev, &mdev->net_ee); |
b411b363 PR |
2268 | if (rr) |
2269 | dev_err(DEV, "%d EEs in net list found!\n", rr); | |
2270 | } | |
2271 | ||
774b3055 | 2272 | /* caution. no locking. */ |
81fa2e67 | 2273 | void drbd_minor_destroy(struct kref *kref) |
b411b363 | 2274 | { |
81fa2e67 | 2275 | struct drbd_conf *mdev = container_of(kref, struct drbd_conf, kref); |
9dc9fbb3 PR |
2276 | struct drbd_tconn *tconn = mdev->tconn; |
2277 | ||
b411b363 | 2278 | /* paranoia asserts */ |
70dc65e1 | 2279 | D_ASSERT(mdev->open_cnt == 0); |
e42325a5 | 2280 | D_ASSERT(list_empty(&mdev->tconn->data.work.q)); |
b411b363 PR |
2281 | /* end paranoia asserts */ |
2282 | ||
b411b363 PR |
2283 | /* cleanup stuff that may have been allocated during |
2284 | * device (re-)configuration or state changes */ | |
2285 | ||
2286 | if (mdev->this_bdev) | |
2287 | bdput(mdev->this_bdev); | |
2288 | ||
1d041225 PR |
2289 | drbd_free_bc(mdev->ldev); |
2290 | mdev->ldev = NULL; | |
b411b363 | 2291 | |
7721f567 | 2292 | drbd_release_all_peer_reqs(mdev); |
b411b363 | 2293 | |
b411b363 PR |
2294 | lc_destroy(mdev->act_log); |
2295 | lc_destroy(mdev->resync); | |
2296 | ||
2297 | kfree(mdev->p_uuid); | |
2298 | /* mdev->p_uuid = NULL; */ | |
2299 | ||
cd1d9950 PR |
2300 | kfree(mdev->current_epoch); |
2301 | if (mdev->bitmap) /* should no longer be there. */ | |
2302 | drbd_bm_cleanup(mdev); | |
2303 | __free_page(mdev->md_io_page); | |
2304 | put_disk(mdev->vdisk); | |
2305 | blk_cleanup_queue(mdev->rq_queue); | |
9958c857 | 2306 | kfree(mdev->rs_plan_s); |
cd1d9950 | 2307 | kfree(mdev); |
9dc9fbb3 PR |
2308 | |
2309 | kref_put(&tconn->kref, &conn_destroy); | |
b411b363 PR |
2310 | } |
2311 | ||
2312 | static void drbd_cleanup(void) | |
2313 | { | |
2314 | unsigned int i; | |
81a5d60e | 2315 | struct drbd_conf *mdev; |
81fa2e67 | 2316 | struct drbd_tconn *tconn, *tmp; |
b411b363 PR |
2317 | |
2318 | unregister_reboot_notifier(&drbd_notifier); | |
2319 | ||
17a93f30 LE |
2320 | /* first remove proc, |
2321 | * drbdsetup uses it's presence to detect | |
2322 | * whether DRBD is loaded. | |
2323 | * If we would get stuck in proc removal, | |
2324 | * but have netlink already deregistered, | |
2325 | * some drbdsetup commands may wait forever | |
2326 | * for an answer. | |
2327 | */ | |
2328 | if (drbd_proc) | |
2329 | remove_proc_entry("drbd", NULL); | |
2330 | ||
3b98c0c2 | 2331 | drbd_genl_unregister(); |
b411b363 | 2332 | |
81fa2e67 PR |
2333 | idr_for_each_entry(&minors, mdev, i) { |
2334 | idr_remove(&minors, mdev_to_minor(mdev)); | |
2335 | idr_remove(&mdev->tconn->volumes, mdev->vnr); | |
2336 | del_gendisk(mdev->vdisk); | |
c141ebda | 2337 | /* synchronize_rcu(); No other threads running at this point */ |
81fa2e67 PR |
2338 | kref_put(&mdev->kref, &drbd_minor_destroy); |
2339 | } | |
2340 | ||
c141ebda | 2341 | /* not _rcu since, no other updater anymore. Genl already unregistered */ |
81fa2e67 | 2342 | list_for_each_entry_safe(tconn, tmp, &drbd_tconns, all_tconn) { |
c141ebda PR |
2343 | list_del(&tconn->all_tconn); /* not _rcu no proc, not other threads */ |
2344 | /* synchronize_rcu(); */ | |
81fa2e67 PR |
2345 | kref_put(&tconn->kref, &conn_destroy); |
2346 | } | |
ff370e5a | 2347 | |
81a5d60e | 2348 | drbd_destroy_mempools(); |
b411b363 PR |
2349 | unregister_blkdev(DRBD_MAJOR, "drbd"); |
2350 | ||
81a5d60e PR |
2351 | idr_destroy(&minors); |
2352 | ||
b411b363 PR |
2353 | printk(KERN_INFO "drbd: module cleanup done.\n"); |
2354 | } | |
2355 | ||
2356 | /** | |
2357 | * drbd_congested() - Callback for pdflush | |
2358 | * @congested_data: User data | |
2359 | * @bdi_bits: Bits pdflush is currently interested in | |
2360 | * | |
2361 | * Returns 1<<BDI_async_congested and/or 1<<BDI_sync_congested if we are congested. | |
2362 | */ | |
2363 | static int drbd_congested(void *congested_data, int bdi_bits) | |
2364 | { | |
2365 | struct drbd_conf *mdev = congested_data; | |
2366 | struct request_queue *q; | |
2367 | char reason = '-'; | |
2368 | int r = 0; | |
2369 | ||
1b881ef7 | 2370 | if (!may_inc_ap_bio(mdev)) { |
b411b363 PR |
2371 | /* DRBD has frozen IO */ |
2372 | r = bdi_bits; | |
2373 | reason = 'd'; | |
2374 | goto out; | |
2375 | } | |
2376 | ||
2377 | if (get_ldev(mdev)) { | |
2378 | q = bdev_get_queue(mdev->ldev->backing_bdev); | |
2379 | r = bdi_congested(&q->backing_dev_info, bdi_bits); | |
2380 | put_ldev(mdev); | |
2381 | if (r) | |
2382 | reason = 'b'; | |
2383 | } | |
2384 | ||
01a311a5 | 2385 | if (bdi_bits & (1 << BDI_async_congested) && test_bit(NET_CONGESTED, &mdev->tconn->flags)) { |
b411b363 PR |
2386 | r |= (1 << BDI_async_congested); |
2387 | reason = reason == 'b' ? 'a' : 'n'; | |
2388 | } | |
2389 | ||
2390 | out: | |
2391 | mdev->congestion_reason = reason; | |
2392 | return r; | |
2393 | } | |
2394 | ||
6699b655 PR |
2395 | static void drbd_init_workqueue(struct drbd_work_queue* wq) |
2396 | { | |
2397 | sema_init(&wq->s, 0); | |
2398 | spin_lock_init(&wq->q_lock); | |
2399 | INIT_LIST_HEAD(&wq->q); | |
2400 | } | |
2401 | ||
0ace9dfa | 2402 | struct drbd_tconn *conn_get_by_name(const char *name) |
1aba4d7f PR |
2403 | { |
2404 | struct drbd_tconn *tconn; | |
2405 | ||
3b98c0c2 LE |
2406 | if (!name || !name[0]) |
2407 | return NULL; | |
2408 | ||
c141ebda | 2409 | rcu_read_lock(); |
ec0bddbc | 2410 | list_for_each_entry_rcu(tconn, &drbd_tconns, all_tconn) { |
0ace9dfa PR |
2411 | if (!strcmp(tconn->name, name)) { |
2412 | kref_get(&tconn->kref); | |
1aba4d7f | 2413 | goto found; |
0ace9dfa | 2414 | } |
1aba4d7f PR |
2415 | } |
2416 | tconn = NULL; | |
2417 | found: | |
c141ebda | 2418 | rcu_read_unlock(); |
1aba4d7f PR |
2419 | return tconn; |
2420 | } | |
2421 | ||
e6ef8a5c AG |
2422 | static int drbd_alloc_socket(struct drbd_socket *socket) |
2423 | { | |
2424 | socket->rbuf = (void *) __get_free_page(GFP_KERNEL); | |
2425 | if (!socket->rbuf) | |
2426 | return -ENOMEM; | |
5a87d920 AG |
2427 | socket->sbuf = (void *) __get_free_page(GFP_KERNEL); |
2428 | if (!socket->sbuf) | |
2429 | return -ENOMEM; | |
e6ef8a5c AG |
2430 | return 0; |
2431 | } | |
2432 | ||
2433 | static void drbd_free_socket(struct drbd_socket *socket) | |
2434 | { | |
5a87d920 | 2435 | free_page((unsigned long) socket->sbuf); |
e6ef8a5c AG |
2436 | free_page((unsigned long) socket->rbuf); |
2437 | } | |
2438 | ||
91fd4dad PR |
2439 | void conn_free_crypto(struct drbd_tconn *tconn) |
2440 | { | |
1d041225 PR |
2441 | drbd_free_sock(tconn); |
2442 | ||
2443 | crypto_free_hash(tconn->csums_tfm); | |
2444 | crypto_free_hash(tconn->verify_tfm); | |
91fd4dad | 2445 | crypto_free_hash(tconn->cram_hmac_tfm); |
8d412fc6 | 2446 | crypto_free_hash(tconn->integrity_tfm); |
5b614abe | 2447 | crypto_free_hash(tconn->peer_integrity_tfm); |
91fd4dad PR |
2448 | kfree(tconn->int_dig_in); |
2449 | kfree(tconn->int_dig_vv); | |
1d041225 PR |
2450 | |
2451 | tconn->csums_tfm = NULL; | |
2452 | tconn->verify_tfm = NULL; | |
91fd4dad | 2453 | tconn->cram_hmac_tfm = NULL; |
8d412fc6 | 2454 | tconn->integrity_tfm = NULL; |
5b614abe | 2455 | tconn->peer_integrity_tfm = NULL; |
91fd4dad PR |
2456 | tconn->int_dig_in = NULL; |
2457 | tconn->int_dig_vv = NULL; | |
2458 | } | |
2459 | ||
ec0bddbc | 2460 | /* caller must be under genl_lock() */ |
9dc9fbb3 | 2461 | struct drbd_tconn *conn_create(const char *name) |
2111438b PR |
2462 | { |
2463 | struct drbd_tconn *tconn; | |
2464 | ||
2465 | tconn = kzalloc(sizeof(struct drbd_tconn), GFP_KERNEL); | |
2466 | if (!tconn) | |
2467 | return NULL; | |
2468 | ||
2469 | tconn->name = kstrdup(name, GFP_KERNEL); | |
2470 | if (!tconn->name) | |
2471 | goto fail; | |
2472 | ||
e6ef8a5c AG |
2473 | if (drbd_alloc_socket(&tconn->data)) |
2474 | goto fail; | |
2475 | if (drbd_alloc_socket(&tconn->meta)) | |
2476 | goto fail; | |
2477 | ||
774b3055 PR |
2478 | if (!zalloc_cpumask_var(&tconn->cpu_mask, GFP_KERNEL)) |
2479 | goto fail; | |
2480 | ||
2f5cdd0b PR |
2481 | if (!tl_init(tconn)) |
2482 | goto fail; | |
2483 | ||
bbeb641c | 2484 | tconn->cstate = C_STANDALONE; |
8410da8f | 2485 | mutex_init(&tconn->cstate_mutex); |
6699b655 | 2486 | spin_lock_init(&tconn->req_lock); |
a0095508 | 2487 | mutex_init(&tconn->conf_update); |
2a67d8b9 | 2488 | init_waitqueue_head(&tconn->ping_wait); |
062e879c | 2489 | idr_init(&tconn->volumes); |
b2fb6dbe | 2490 | |
6699b655 PR |
2491 | drbd_init_workqueue(&tconn->data.work); |
2492 | mutex_init(&tconn->data.mutex); | |
2493 | ||
2494 | drbd_init_workqueue(&tconn->meta.work); | |
2495 | mutex_init(&tconn->meta.mutex); | |
2496 | ||
392c8801 PR |
2497 | drbd_thread_init(tconn, &tconn->receiver, drbdd_init, "receiver"); |
2498 | drbd_thread_init(tconn, &tconn->worker, drbd_worker, "worker"); | |
2499 | drbd_thread_init(tconn, &tconn->asender, drbd_asender, "asender"); | |
2500 | ||
b966b5dd | 2501 | drbd_set_res_opts_defaults(&tconn->res_opts); |
f399002e | 2502 | |
9dc9fbb3 | 2503 | kref_init(&tconn->kref); |
ec0bddbc | 2504 | list_add_tail_rcu(&tconn->all_tconn, &drbd_tconns); |
2111438b PR |
2505 | |
2506 | return tconn; | |
2507 | ||
2508 | fail: | |
2f5cdd0b | 2509 | tl_cleanup(tconn); |
774b3055 | 2510 | free_cpumask_var(tconn->cpu_mask); |
e6ef8a5c AG |
2511 | drbd_free_socket(&tconn->meta); |
2512 | drbd_free_socket(&tconn->data); | |
2111438b PR |
2513 | kfree(tconn->name); |
2514 | kfree(tconn); | |
2515 | ||
2516 | return NULL; | |
2517 | } | |
2518 | ||
9dc9fbb3 | 2519 | void conn_destroy(struct kref *kref) |
2111438b | 2520 | { |
9dc9fbb3 PR |
2521 | struct drbd_tconn *tconn = container_of(kref, struct drbd_tconn, kref); |
2522 | ||
062e879c | 2523 | idr_destroy(&tconn->volumes); |
2111438b | 2524 | |
774b3055 | 2525 | free_cpumask_var(tconn->cpu_mask); |
e6ef8a5c AG |
2526 | drbd_free_socket(&tconn->meta); |
2527 | drbd_free_socket(&tconn->data); | |
2111438b | 2528 | kfree(tconn->name); |
b42a70ad PR |
2529 | kfree(tconn->int_dig_in); |
2530 | kfree(tconn->int_dig_vv); | |
2111438b PR |
2531 | kfree(tconn); |
2532 | } | |
2533 | ||
774b3055 | 2534 | enum drbd_ret_code conn_new_minor(struct drbd_tconn *tconn, unsigned int minor, int vnr) |
b411b363 PR |
2535 | { |
2536 | struct drbd_conf *mdev; | |
2537 | struct gendisk *disk; | |
2538 | struct request_queue *q; | |
774b3055 | 2539 | int vnr_got = vnr; |
81a5d60e | 2540 | int minor_got = minor; |
8432b314 | 2541 | enum drbd_ret_code err = ERR_NOMEM; |
774b3055 PR |
2542 | |
2543 | mdev = minor_to_mdev(minor); | |
2544 | if (mdev) | |
2545 | return ERR_MINOR_EXISTS; | |
b411b363 PR |
2546 | |
2547 | /* GFP_KERNEL, we are outside of all write-out paths */ | |
2548 | mdev = kzalloc(sizeof(struct drbd_conf), GFP_KERNEL); | |
2549 | if (!mdev) | |
774b3055 PR |
2550 | return ERR_NOMEM; |
2551 | ||
9dc9fbb3 | 2552 | kref_get(&tconn->kref); |
774b3055 | 2553 | mdev->tconn = tconn; |
9dc9fbb3 | 2554 | |
b411b363 | 2555 | mdev->minor = minor; |
3b98c0c2 | 2556 | mdev->vnr = vnr; |
b411b363 PR |
2557 | |
2558 | drbd_init_set_defaults(mdev); | |
2559 | ||
2560 | q = blk_alloc_queue(GFP_KERNEL); | |
2561 | if (!q) | |
2562 | goto out_no_q; | |
2563 | mdev->rq_queue = q; | |
2564 | q->queuedata = mdev; | |
b411b363 PR |
2565 | |
2566 | disk = alloc_disk(1); | |
2567 | if (!disk) | |
2568 | goto out_no_disk; | |
2569 | mdev->vdisk = disk; | |
2570 | ||
81e84650 | 2571 | set_disk_ro(disk, true); |
b411b363 PR |
2572 | |
2573 | disk->queue = q; | |
2574 | disk->major = DRBD_MAJOR; | |
2575 | disk->first_minor = minor; | |
2576 | disk->fops = &drbd_ops; | |
2577 | sprintf(disk->disk_name, "drbd%d", minor); | |
2578 | disk->private_data = mdev; | |
2579 | ||
2580 | mdev->this_bdev = bdget(MKDEV(DRBD_MAJOR, minor)); | |
2581 | /* we have no partitions. we contain only ourselves. */ | |
2582 | mdev->this_bdev->bd_contains = mdev->this_bdev; | |
2583 | ||
2584 | q->backing_dev_info.congested_fn = drbd_congested; | |
2585 | q->backing_dev_info.congested_data = mdev; | |
2586 | ||
2f58dcfc | 2587 | blk_queue_make_request(q, drbd_make_request); |
99432fcc PR |
2588 | /* Setting the max_hw_sectors to an odd value of 8kibyte here |
2589 | This triggers a max_bio_size message upon first attach or connect */ | |
2590 | blk_queue_max_hw_sectors(q, DRBD_MAX_BIO_SIZE_SAFE >> 8); | |
b411b363 PR |
2591 | blk_queue_bounce_limit(q, BLK_BOUNCE_ANY); |
2592 | blk_queue_merge_bvec(q, drbd_merge_bvec); | |
87eeee41 | 2593 | q->queue_lock = &mdev->tconn->req_lock; /* needed since we use */ |
b411b363 PR |
2594 | |
2595 | mdev->md_io_page = alloc_page(GFP_KERNEL); | |
2596 | if (!mdev->md_io_page) | |
2597 | goto out_no_io_page; | |
2598 | ||
2599 | if (drbd_bm_init(mdev)) | |
2600 | goto out_no_bitmap; | |
dac1389c | 2601 | mdev->read_requests = RB_ROOT; |
de696716 | 2602 | mdev->write_requests = RB_ROOT; |
b411b363 | 2603 | |
b411b363 PR |
2604 | mdev->current_epoch = kzalloc(sizeof(struct drbd_epoch), GFP_KERNEL); |
2605 | if (!mdev->current_epoch) | |
2606 | goto out_no_epoch; | |
2607 | ||
2608 | INIT_LIST_HEAD(&mdev->current_epoch->list); | |
2609 | mdev->epochs = 1; | |
2610 | ||
81a5d60e | 2611 | if (!idr_pre_get(&minors, GFP_KERNEL)) |
8432b314 LE |
2612 | goto out_no_minor_idr; |
2613 | if (idr_get_new_above(&minors, mdev, minor, &minor_got)) | |
2614 | goto out_no_minor_idr; | |
81a5d60e | 2615 | if (minor_got != minor) { |
8432b314 LE |
2616 | err = ERR_MINOR_EXISTS; |
2617 | drbd_msg_put_info("requested minor exists already"); | |
569083c0 | 2618 | goto out_idr_remove_minor; |
81a5d60e | 2619 | } |
8432b314 LE |
2620 | |
2621 | if (!idr_pre_get(&tconn->volumes, GFP_KERNEL)) | |
2622 | goto out_idr_remove_minor; | |
2623 | if (idr_get_new_above(&tconn->volumes, mdev, vnr, &vnr_got)) | |
2624 | goto out_idr_remove_minor; | |
2625 | if (vnr_got != vnr) { | |
2626 | err = ERR_INVALID_REQUEST; | |
2627 | drbd_msg_put_info("requested volume exists already"); | |
2628 | goto out_idr_remove_vol; | |
2629 | } | |
774b3055 | 2630 | add_disk(disk); |
81fa2e67 | 2631 | kref_init(&mdev->kref); /* one ref for both idrs and the the add_disk */ |
774b3055 | 2632 | |
2325eb66 PR |
2633 | /* inherit the connection state */ |
2634 | mdev->state.conn = tconn->cstate; | |
2635 | if (mdev->state.conn == C_WF_REPORT_PARAMS) | |
c141ebda | 2636 | drbd_connected(mdev); |
2325eb66 | 2637 | |
774b3055 | 2638 | return NO_ERROR; |
b411b363 | 2639 | |
569083c0 LE |
2640 | out_idr_remove_vol: |
2641 | idr_remove(&tconn->volumes, vnr_got); | |
8432b314 LE |
2642 | out_idr_remove_minor: |
2643 | idr_remove(&minors, minor_got); | |
569083c0 | 2644 | synchronize_rcu(); |
8432b314 | 2645 | out_no_minor_idr: |
81a5d60e | 2646 | kfree(mdev->current_epoch); |
b411b363 | 2647 | out_no_epoch: |
b411b363 PR |
2648 | drbd_bm_cleanup(mdev); |
2649 | out_no_bitmap: | |
2650 | __free_page(mdev->md_io_page); | |
2651 | out_no_io_page: | |
2652 | put_disk(disk); | |
2653 | out_no_disk: | |
2654 | blk_cleanup_queue(q); | |
2655 | out_no_q: | |
b411b363 | 2656 | kfree(mdev); |
9dc9fbb3 | 2657 | kref_put(&tconn->kref, &conn_destroy); |
8432b314 | 2658 | return err; |
b411b363 PR |
2659 | } |
2660 | ||
b411b363 PR |
2661 | int __init drbd_init(void) |
2662 | { | |
2663 | int err; | |
2664 | ||
2b8a90b5 | 2665 | if (minor_count < DRBD_MINOR_COUNT_MIN || minor_count > DRBD_MINOR_COUNT_MAX) { |
b411b363 | 2666 | printk(KERN_ERR |
81a5d60e | 2667 | "drbd: invalid minor_count (%d)\n", minor_count); |
b411b363 PR |
2668 | #ifdef MODULE |
2669 | return -EINVAL; | |
2670 | #else | |
2671 | minor_count = 8; | |
2672 | #endif | |
2673 | } | |
2674 | ||
b411b363 PR |
2675 | err = register_blkdev(DRBD_MAJOR, "drbd"); |
2676 | if (err) { | |
2677 | printk(KERN_ERR | |
2678 | "drbd: unable to register block device major %d\n", | |
2679 | DRBD_MAJOR); | |
2680 | return err; | |
2681 | } | |
2682 | ||
3b98c0c2 LE |
2683 | err = drbd_genl_register(); |
2684 | if (err) { | |
2685 | printk(KERN_ERR "drbd: unable to register generic netlink family\n"); | |
2686 | goto fail; | |
2687 | } | |
2688 | ||
2689 | ||
b411b363 PR |
2690 | register_reboot_notifier(&drbd_notifier); |
2691 | ||
2692 | /* | |
2693 | * allocate all necessary structs | |
2694 | */ | |
2695 | err = -ENOMEM; | |
2696 | ||
2697 | init_waitqueue_head(&drbd_pp_wait); | |
2698 | ||
2699 | drbd_proc = NULL; /* play safe for drbd_cleanup */ | |
81a5d60e | 2700 | idr_init(&minors); |
b411b363 PR |
2701 | |
2702 | err = drbd_create_mempools(); | |
2703 | if (err) | |
3b98c0c2 | 2704 | goto fail; |
b411b363 | 2705 | |
8c484ee4 | 2706 | drbd_proc = proc_create_data("drbd", S_IFREG | S_IRUGO , NULL, &drbd_proc_fops, NULL); |
b411b363 PR |
2707 | if (!drbd_proc) { |
2708 | printk(KERN_ERR "drbd: unable to register proc file\n"); | |
3b98c0c2 | 2709 | goto fail; |
b411b363 PR |
2710 | } |
2711 | ||
2712 | rwlock_init(&global_state_lock); | |
2111438b | 2713 | INIT_LIST_HEAD(&drbd_tconns); |
b411b363 PR |
2714 | |
2715 | printk(KERN_INFO "drbd: initialized. " | |
2716 | "Version: " REL_VERSION " (api:%d/proto:%d-%d)\n", | |
2717 | API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX); | |
2718 | printk(KERN_INFO "drbd: %s\n", drbd_buildtag()); | |
2719 | printk(KERN_INFO "drbd: registered as block device major %d\n", | |
2720 | DRBD_MAJOR); | |
b411b363 PR |
2721 | |
2722 | return 0; /* Success! */ | |
2723 | ||
3b98c0c2 | 2724 | fail: |
b411b363 PR |
2725 | drbd_cleanup(); |
2726 | if (err == -ENOMEM) | |
2727 | /* currently always the case */ | |
2728 | printk(KERN_ERR "drbd: ran out of memory\n"); | |
2729 | else | |
2730 | printk(KERN_ERR "drbd: initialization failure\n"); | |
2731 | return err; | |
2732 | } | |
2733 | ||
2734 | void drbd_free_bc(struct drbd_backing_dev *ldev) | |
2735 | { | |
2736 | if (ldev == NULL) | |
2737 | return; | |
2738 | ||
e525fd89 TH |
2739 | blkdev_put(ldev->backing_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL); |
2740 | blkdev_put(ldev->md_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL); | |
b411b363 PR |
2741 | |
2742 | kfree(ldev); | |
2743 | } | |
2744 | ||
360cc740 PR |
2745 | void drbd_free_sock(struct drbd_tconn *tconn) |
2746 | { | |
2747 | if (tconn->data.socket) { | |
2748 | mutex_lock(&tconn->data.mutex); | |
2749 | kernel_sock_shutdown(tconn->data.socket, SHUT_RDWR); | |
2750 | sock_release(tconn->data.socket); | |
2751 | tconn->data.socket = NULL; | |
2752 | mutex_unlock(&tconn->data.mutex); | |
b411b363 | 2753 | } |
360cc740 PR |
2754 | if (tconn->meta.socket) { |
2755 | mutex_lock(&tconn->meta.mutex); | |
2756 | kernel_sock_shutdown(tconn->meta.socket, SHUT_RDWR); | |
2757 | sock_release(tconn->meta.socket); | |
2758 | tconn->meta.socket = NULL; | |
2759 | mutex_unlock(&tconn->meta.mutex); | |
b411b363 PR |
2760 | } |
2761 | } | |
2762 | ||
b411b363 PR |
2763 | /* meta data management */ |
2764 | ||
2765 | struct meta_data_on_disk { | |
2766 | u64 la_size; /* last agreed size. */ | |
2767 | u64 uuid[UI_SIZE]; /* UUIDs. */ | |
2768 | u64 device_uuid; | |
2769 | u64 reserved_u64_1; | |
2770 | u32 flags; /* MDF */ | |
2771 | u32 magic; | |
2772 | u32 md_size_sect; | |
2773 | u32 al_offset; /* offset to this block */ | |
2774 | u32 al_nr_extents; /* important for restoring the AL */ | |
f399002e | 2775 | /* `-- act_log->nr_elements <-- ldev->dc.al_extents */ |
b411b363 PR |
2776 | u32 bm_offset; /* offset to the bitmap, from here */ |
2777 | u32 bm_bytes_per_bit; /* BM_BLOCK_SIZE */ | |
99432fcc PR |
2778 | u32 la_peer_max_bio_size; /* last peer max_bio_size */ |
2779 | u32 reserved_u32[3]; | |
b411b363 PR |
2780 | |
2781 | } __packed; | |
2782 | ||
2783 | /** | |
2784 | * drbd_md_sync() - Writes the meta data super block if the MD_DIRTY flag bit is set | |
2785 | * @mdev: DRBD device. | |
2786 | */ | |
2787 | void drbd_md_sync(struct drbd_conf *mdev) | |
2788 | { | |
2789 | struct meta_data_on_disk *buffer; | |
2790 | sector_t sector; | |
2791 | int i; | |
2792 | ||
ee15b038 LE |
2793 | del_timer(&mdev->md_sync_timer); |
2794 | /* timer may be rearmed by drbd_md_mark_dirty() now. */ | |
b411b363 PR |
2795 | if (!test_and_clear_bit(MD_DIRTY, &mdev->flags)) |
2796 | return; | |
b411b363 PR |
2797 | |
2798 | /* We use here D_FAILED and not D_ATTACHING because we try to write | |
2799 | * metadata even if we detach due to a disk failure! */ | |
2800 | if (!get_ldev_if_state(mdev, D_FAILED)) | |
2801 | return; | |
2802 | ||
b411b363 PR |
2803 | mutex_lock(&mdev->md_io_mutex); |
2804 | buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page); | |
2805 | memset(buffer, 0, 512); | |
2806 | ||
2807 | buffer->la_size = cpu_to_be64(drbd_get_capacity(mdev->this_bdev)); | |
2808 | for (i = UI_CURRENT; i < UI_SIZE; i++) | |
2809 | buffer->uuid[i] = cpu_to_be64(mdev->ldev->md.uuid[i]); | |
2810 | buffer->flags = cpu_to_be32(mdev->ldev->md.flags); | |
2811 | buffer->magic = cpu_to_be32(DRBD_MD_MAGIC); | |
2812 | ||
2813 | buffer->md_size_sect = cpu_to_be32(mdev->ldev->md.md_size_sect); | |
2814 | buffer->al_offset = cpu_to_be32(mdev->ldev->md.al_offset); | |
2815 | buffer->al_nr_extents = cpu_to_be32(mdev->act_log->nr_elements); | |
2816 | buffer->bm_bytes_per_bit = cpu_to_be32(BM_BLOCK_SIZE); | |
2817 | buffer->device_uuid = cpu_to_be64(mdev->ldev->md.device_uuid); | |
2818 | ||
2819 | buffer->bm_offset = cpu_to_be32(mdev->ldev->md.bm_offset); | |
99432fcc | 2820 | buffer->la_peer_max_bio_size = cpu_to_be32(mdev->peer_max_bio_size); |
b411b363 PR |
2821 | |
2822 | D_ASSERT(drbd_md_ss__(mdev, mdev->ldev) == mdev->ldev->md.md_offset); | |
2823 | sector = mdev->ldev->md.md_offset; | |
2824 | ||
3fbf4d21 | 2825 | if (drbd_md_sync_page_io(mdev, mdev->ldev, sector, WRITE)) { |
b411b363 PR |
2826 | /* this was a try anyways ... */ |
2827 | dev_err(DEV, "meta data update failed!\n"); | |
81e84650 | 2828 | drbd_chk_io_error(mdev, 1, true); |
b411b363 PR |
2829 | } |
2830 | ||
2831 | /* Update mdev->ldev->md.la_size_sect, | |
2832 | * since we updated it on metadata. */ | |
2833 | mdev->ldev->md.la_size_sect = drbd_get_capacity(mdev->this_bdev); | |
2834 | ||
2835 | mutex_unlock(&mdev->md_io_mutex); | |
2836 | put_ldev(mdev); | |
2837 | } | |
2838 | ||
2839 | /** | |
2840 | * drbd_md_read() - Reads in the meta data super block | |
2841 | * @mdev: DRBD device. | |
2842 | * @bdev: Device from which the meta data should be read in. | |
2843 | * | |
116676ca | 2844 | * Return 0 (NO_ERROR) on success, and an enum drbd_ret_code in case |
b411b363 PR |
2845 | * something goes wrong. Currently only: ERR_IO_MD_DISK, ERR_MD_INVALID. |
2846 | */ | |
2847 | int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev) | |
2848 | { | |
2849 | struct meta_data_on_disk *buffer; | |
2850 | int i, rv = NO_ERROR; | |
2851 | ||
2852 | if (!get_ldev_if_state(mdev, D_ATTACHING)) | |
2853 | return ERR_IO_MD_DISK; | |
2854 | ||
b411b363 PR |
2855 | mutex_lock(&mdev->md_io_mutex); |
2856 | buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page); | |
2857 | ||
3fbf4d21 | 2858 | if (drbd_md_sync_page_io(mdev, bdev, bdev->md.md_offset, READ)) { |
25985edc | 2859 | /* NOTE: can't do normal error processing here as this is |
b411b363 PR |
2860 | called BEFORE disk is attached */ |
2861 | dev_err(DEV, "Error while reading metadata.\n"); | |
2862 | rv = ERR_IO_MD_DISK; | |
2863 | goto err; | |
2864 | } | |
2865 | ||
e7fad8af | 2866 | if (buffer->magic != cpu_to_be32(DRBD_MD_MAGIC)) { |
b411b363 PR |
2867 | dev_err(DEV, "Error while reading metadata, magic not found.\n"); |
2868 | rv = ERR_MD_INVALID; | |
2869 | goto err; | |
2870 | } | |
2871 | if (be32_to_cpu(buffer->al_offset) != bdev->md.al_offset) { | |
2872 | dev_err(DEV, "unexpected al_offset: %d (expected %d)\n", | |
2873 | be32_to_cpu(buffer->al_offset), bdev->md.al_offset); | |
2874 | rv = ERR_MD_INVALID; | |
2875 | goto err; | |
2876 | } | |
2877 | if (be32_to_cpu(buffer->bm_offset) != bdev->md.bm_offset) { | |
2878 | dev_err(DEV, "unexpected bm_offset: %d (expected %d)\n", | |
2879 | be32_to_cpu(buffer->bm_offset), bdev->md.bm_offset); | |
2880 | rv = ERR_MD_INVALID; | |
2881 | goto err; | |
2882 | } | |
2883 | if (be32_to_cpu(buffer->md_size_sect) != bdev->md.md_size_sect) { | |
2884 | dev_err(DEV, "unexpected md_size: %u (expected %u)\n", | |
2885 | be32_to_cpu(buffer->md_size_sect), bdev->md.md_size_sect); | |
2886 | rv = ERR_MD_INVALID; | |
2887 | goto err; | |
2888 | } | |
2889 | ||
2890 | if (be32_to_cpu(buffer->bm_bytes_per_bit) != BM_BLOCK_SIZE) { | |
2891 | dev_err(DEV, "unexpected bm_bytes_per_bit: %u (expected %u)\n", | |
2892 | be32_to_cpu(buffer->bm_bytes_per_bit), BM_BLOCK_SIZE); | |
2893 | rv = ERR_MD_INVALID; | |
2894 | goto err; | |
2895 | } | |
2896 | ||
2897 | bdev->md.la_size_sect = be64_to_cpu(buffer->la_size); | |
2898 | for (i = UI_CURRENT; i < UI_SIZE; i++) | |
2899 | bdev->md.uuid[i] = be64_to_cpu(buffer->uuid[i]); | |
2900 | bdev->md.flags = be32_to_cpu(buffer->flags); | |
b411b363 PR |
2901 | bdev->md.device_uuid = be64_to_cpu(buffer->device_uuid); |
2902 | ||
87eeee41 | 2903 | spin_lock_irq(&mdev->tconn->req_lock); |
99432fcc PR |
2904 | if (mdev->state.conn < C_CONNECTED) { |
2905 | int peer; | |
2906 | peer = be32_to_cpu(buffer->la_peer_max_bio_size); | |
2907 | peer = max_t(int, peer, DRBD_MAX_BIO_SIZE_SAFE); | |
2908 | mdev->peer_max_bio_size = peer; | |
2909 | } | |
87eeee41 | 2910 | spin_unlock_irq(&mdev->tconn->req_lock); |
99432fcc | 2911 | |
daeda1cc PR |
2912 | /* This blocks wants to be get removed... */ |
2913 | bdev->disk_conf->al_extents = be32_to_cpu(buffer->al_nr_extents); | |
2914 | if (bdev->disk_conf->al_extents < DRBD_AL_EXTENTS_MIN) | |
2915 | bdev->disk_conf->al_extents = DRBD_AL_EXTENTS_DEF; | |
b411b363 PR |
2916 | |
2917 | err: | |
2918 | mutex_unlock(&mdev->md_io_mutex); | |
2919 | put_ldev(mdev); | |
2920 | ||
2921 | return rv; | |
2922 | } | |
2923 | ||
2924 | /** | |
2925 | * drbd_md_mark_dirty() - Mark meta data super block as dirty | |
2926 | * @mdev: DRBD device. | |
2927 | * | |
2928 | * Call this function if you change anything that should be written to | |
2929 | * the meta-data super block. This function sets MD_DIRTY, and starts a | |
2930 | * timer that ensures that within five seconds you have to call drbd_md_sync(). | |
2931 | */ | |
ca0e6098 | 2932 | #ifdef DEBUG |
ee15b038 LE |
2933 | void drbd_md_mark_dirty_(struct drbd_conf *mdev, unsigned int line, const char *func) |
2934 | { | |
2935 | if (!test_and_set_bit(MD_DIRTY, &mdev->flags)) { | |
2936 | mod_timer(&mdev->md_sync_timer, jiffies + HZ); | |
2937 | mdev->last_md_mark_dirty.line = line; | |
2938 | mdev->last_md_mark_dirty.func = func; | |
2939 | } | |
2940 | } | |
2941 | #else | |
b411b363 PR |
2942 | void drbd_md_mark_dirty(struct drbd_conf *mdev) |
2943 | { | |
ee15b038 | 2944 | if (!test_and_set_bit(MD_DIRTY, &mdev->flags)) |
ca0e6098 | 2945 | mod_timer(&mdev->md_sync_timer, jiffies + 5*HZ); |
b411b363 | 2946 | } |
ee15b038 | 2947 | #endif |
b411b363 PR |
2948 | |
2949 | static void drbd_uuid_move_history(struct drbd_conf *mdev) __must_hold(local) | |
2950 | { | |
2951 | int i; | |
2952 | ||
62b0da3a | 2953 | for (i = UI_HISTORY_START; i < UI_HISTORY_END; i++) |
b411b363 | 2954 | mdev->ldev->md.uuid[i+1] = mdev->ldev->md.uuid[i]; |
b411b363 PR |
2955 | } |
2956 | ||
2957 | void _drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local) | |
2958 | { | |
2959 | if (idx == UI_CURRENT) { | |
2960 | if (mdev->state.role == R_PRIMARY) | |
2961 | val |= 1; | |
2962 | else | |
2963 | val &= ~((u64)1); | |
2964 | ||
2965 | drbd_set_ed_uuid(mdev, val); | |
2966 | } | |
2967 | ||
2968 | mdev->ldev->md.uuid[idx] = val; | |
b411b363 PR |
2969 | drbd_md_mark_dirty(mdev); |
2970 | } | |
2971 | ||
2972 | ||
2973 | void drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local) | |
2974 | { | |
2975 | if (mdev->ldev->md.uuid[idx]) { | |
2976 | drbd_uuid_move_history(mdev); | |
2977 | mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[idx]; | |
b411b363 PR |
2978 | } |
2979 | _drbd_uuid_set(mdev, idx, val); | |
2980 | } | |
2981 | ||
2982 | /** | |
2983 | * drbd_uuid_new_current() - Creates a new current UUID | |
2984 | * @mdev: DRBD device. | |
2985 | * | |
2986 | * Creates a new current UUID, and rotates the old current UUID into | |
2987 | * the bitmap slot. Causes an incremental resync upon next connect. | |
2988 | */ | |
2989 | void drbd_uuid_new_current(struct drbd_conf *mdev) __must_hold(local) | |
2990 | { | |
2991 | u64 val; | |
62b0da3a LE |
2992 | unsigned long long bm_uuid = mdev->ldev->md.uuid[UI_BITMAP]; |
2993 | ||
2994 | if (bm_uuid) | |
2995 | dev_warn(DEV, "bm UUID was already set: %llX\n", bm_uuid); | |
b411b363 | 2996 | |
b411b363 | 2997 | mdev->ldev->md.uuid[UI_BITMAP] = mdev->ldev->md.uuid[UI_CURRENT]; |
b411b363 PR |
2998 | |
2999 | get_random_bytes(&val, sizeof(u64)); | |
3000 | _drbd_uuid_set(mdev, UI_CURRENT, val); | |
62b0da3a | 3001 | drbd_print_uuids(mdev, "new current UUID"); |
aaa8e2b3 LE |
3002 | /* get it to stable storage _now_ */ |
3003 | drbd_md_sync(mdev); | |
b411b363 PR |
3004 | } |
3005 | ||
3006 | void drbd_uuid_set_bm(struct drbd_conf *mdev, u64 val) __must_hold(local) | |
3007 | { | |
3008 | if (mdev->ldev->md.uuid[UI_BITMAP] == 0 && val == 0) | |
3009 | return; | |
3010 | ||
3011 | if (val == 0) { | |
3012 | drbd_uuid_move_history(mdev); | |
3013 | mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[UI_BITMAP]; | |
3014 | mdev->ldev->md.uuid[UI_BITMAP] = 0; | |
b411b363 | 3015 | } else { |
62b0da3a LE |
3016 | unsigned long long bm_uuid = mdev->ldev->md.uuid[UI_BITMAP]; |
3017 | if (bm_uuid) | |
3018 | dev_warn(DEV, "bm UUID was already set: %llX\n", bm_uuid); | |
b411b363 | 3019 | |
62b0da3a | 3020 | mdev->ldev->md.uuid[UI_BITMAP] = val & ~((u64)1); |
b411b363 PR |
3021 | } |
3022 | drbd_md_mark_dirty(mdev); | |
3023 | } | |
3024 | ||
3025 | /** | |
3026 | * drbd_bmio_set_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io() | |
3027 | * @mdev: DRBD device. | |
3028 | * | |
3029 | * Sets all bits in the bitmap and writes the whole bitmap to stable storage. | |
3030 | */ | |
3031 | int drbd_bmio_set_n_write(struct drbd_conf *mdev) | |
3032 | { | |
3033 | int rv = -EIO; | |
3034 | ||
3035 | if (get_ldev_if_state(mdev, D_ATTACHING)) { | |
3036 | drbd_md_set_flag(mdev, MDF_FULL_SYNC); | |
3037 | drbd_md_sync(mdev); | |
3038 | drbd_bm_set_all(mdev); | |
3039 | ||
3040 | rv = drbd_bm_write(mdev); | |
3041 | ||
3042 | if (!rv) { | |
3043 | drbd_md_clear_flag(mdev, MDF_FULL_SYNC); | |
3044 | drbd_md_sync(mdev); | |
3045 | } | |
3046 | ||
3047 | put_ldev(mdev); | |
3048 | } | |
3049 | ||
3050 | return rv; | |
3051 | } | |
3052 | ||
3053 | /** | |
3054 | * drbd_bmio_clear_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io() | |
3055 | * @mdev: DRBD device. | |
3056 | * | |
3057 | * Clears all bits in the bitmap and writes the whole bitmap to stable storage. | |
3058 | */ | |
3059 | int drbd_bmio_clear_n_write(struct drbd_conf *mdev) | |
3060 | { | |
3061 | int rv = -EIO; | |
3062 | ||
0778286a | 3063 | drbd_resume_al(mdev); |
b411b363 PR |
3064 | if (get_ldev_if_state(mdev, D_ATTACHING)) { |
3065 | drbd_bm_clear_all(mdev); | |
3066 | rv = drbd_bm_write(mdev); | |
3067 | put_ldev(mdev); | |
3068 | } | |
3069 | ||
3070 | return rv; | |
3071 | } | |
3072 | ||
99920dc5 | 3073 | static int w_bitmap_io(struct drbd_work *w, int unused) |
b411b363 PR |
3074 | { |
3075 | struct bm_io_work *work = container_of(w, struct bm_io_work, w); | |
00d56944 | 3076 | struct drbd_conf *mdev = w->mdev; |
02851e9f | 3077 | int rv = -EIO; |
b411b363 PR |
3078 | |
3079 | D_ASSERT(atomic_read(&mdev->ap_bio_cnt) == 0); | |
3080 | ||
02851e9f | 3081 | if (get_ldev(mdev)) { |
20ceb2b2 | 3082 | drbd_bm_lock(mdev, work->why, work->flags); |
02851e9f LE |
3083 | rv = work->io_fn(mdev); |
3084 | drbd_bm_unlock(mdev); | |
3085 | put_ldev(mdev); | |
3086 | } | |
b411b363 | 3087 | |
4738fa16 | 3088 | clear_bit_unlock(BITMAP_IO, &mdev->flags); |
b411b363 PR |
3089 | wake_up(&mdev->misc_wait); |
3090 | ||
3091 | if (work->done) | |
3092 | work->done(mdev, rv); | |
3093 | ||
3094 | clear_bit(BITMAP_IO_QUEUED, &mdev->flags); | |
3095 | work->why = NULL; | |
20ceb2b2 | 3096 | work->flags = 0; |
b411b363 | 3097 | |
99920dc5 | 3098 | return 0; |
b411b363 PR |
3099 | } |
3100 | ||
82f59cc6 LE |
3101 | void drbd_ldev_destroy(struct drbd_conf *mdev) |
3102 | { | |
3103 | lc_destroy(mdev->resync); | |
3104 | mdev->resync = NULL; | |
3105 | lc_destroy(mdev->act_log); | |
3106 | mdev->act_log = NULL; | |
3107 | __no_warn(local, | |
3108 | drbd_free_bc(mdev->ldev); | |
3109 | mdev->ldev = NULL;); | |
3110 | ||
82f59cc6 LE |
3111 | clear_bit(GO_DISKLESS, &mdev->flags); |
3112 | } | |
3113 | ||
99920dc5 | 3114 | static int w_go_diskless(struct drbd_work *w, int unused) |
e9e6f3ec | 3115 | { |
00d56944 PR |
3116 | struct drbd_conf *mdev = w->mdev; |
3117 | ||
e9e6f3ec | 3118 | D_ASSERT(mdev->state.disk == D_FAILED); |
9d282875 LE |
3119 | /* we cannot assert local_cnt == 0 here, as get_ldev_if_state will |
3120 | * inc/dec it frequently. Once we are D_DISKLESS, no one will touch | |
82f59cc6 LE |
3121 | * the protected members anymore, though, so once put_ldev reaches zero |
3122 | * again, it will be safe to free them. */ | |
e9e6f3ec | 3123 | drbd_force_state(mdev, NS(disk, D_DISKLESS)); |
99920dc5 | 3124 | return 0; |
e9e6f3ec LE |
3125 | } |
3126 | ||
3127 | void drbd_go_diskless(struct drbd_conf *mdev) | |
3128 | { | |
3129 | D_ASSERT(mdev->state.disk == D_FAILED); | |
3130 | if (!test_and_set_bit(GO_DISKLESS, &mdev->flags)) | |
e42325a5 | 3131 | drbd_queue_work(&mdev->tconn->data.work, &mdev->go_diskless); |
e9e6f3ec LE |
3132 | } |
3133 | ||
b411b363 PR |
3134 | /** |
3135 | * drbd_queue_bitmap_io() - Queues an IO operation on the whole bitmap | |
3136 | * @mdev: DRBD device. | |
3137 | * @io_fn: IO callback to be called when bitmap IO is possible | |
3138 | * @done: callback to be called after the bitmap IO was performed | |
3139 | * @why: Descriptive text of the reason for doing the IO | |
3140 | * | |
3141 | * While IO on the bitmap happens we freeze application IO thus we ensure | |
3142 | * that drbd_set_out_of_sync() can not be called. This function MAY ONLY be | |
3143 | * called from worker context. It MUST NOT be used while a previous such | |
3144 | * work is still pending! | |
3145 | */ | |
3146 | void drbd_queue_bitmap_io(struct drbd_conf *mdev, | |
3147 | int (*io_fn)(struct drbd_conf *), | |
3148 | void (*done)(struct drbd_conf *, int), | |
20ceb2b2 | 3149 | char *why, enum bm_flag flags) |
b411b363 | 3150 | { |
e6b3ea83 | 3151 | D_ASSERT(current == mdev->tconn->worker.task); |
b411b363 PR |
3152 | |
3153 | D_ASSERT(!test_bit(BITMAP_IO_QUEUED, &mdev->flags)); | |
3154 | D_ASSERT(!test_bit(BITMAP_IO, &mdev->flags)); | |
3155 | D_ASSERT(list_empty(&mdev->bm_io_work.w.list)); | |
3156 | if (mdev->bm_io_work.why) | |
3157 | dev_err(DEV, "FIXME going to queue '%s' but '%s' still pending?\n", | |
3158 | why, mdev->bm_io_work.why); | |
3159 | ||
3160 | mdev->bm_io_work.io_fn = io_fn; | |
3161 | mdev->bm_io_work.done = done; | |
3162 | mdev->bm_io_work.why = why; | |
20ceb2b2 | 3163 | mdev->bm_io_work.flags = flags; |
b411b363 | 3164 | |
87eeee41 | 3165 | spin_lock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
3166 | set_bit(BITMAP_IO, &mdev->flags); |
3167 | if (atomic_read(&mdev->ap_bio_cnt) == 0) { | |
127b3178 | 3168 | if (!test_and_set_bit(BITMAP_IO_QUEUED, &mdev->flags)) |
e42325a5 | 3169 | drbd_queue_work(&mdev->tconn->data.work, &mdev->bm_io_work.w); |
b411b363 | 3170 | } |
87eeee41 | 3171 | spin_unlock_irq(&mdev->tconn->req_lock); |
b411b363 PR |
3172 | } |
3173 | ||
3174 | /** | |
3175 | * drbd_bitmap_io() - Does an IO operation on the whole bitmap | |
3176 | * @mdev: DRBD device. | |
3177 | * @io_fn: IO callback to be called when bitmap IO is possible | |
3178 | * @why: Descriptive text of the reason for doing the IO | |
3179 | * | |
3180 | * freezes application IO while that the actual IO operations runs. This | |
3181 | * functions MAY NOT be called from worker context. | |
3182 | */ | |
20ceb2b2 LE |
3183 | int drbd_bitmap_io(struct drbd_conf *mdev, int (*io_fn)(struct drbd_conf *), |
3184 | char *why, enum bm_flag flags) | |
b411b363 PR |
3185 | { |
3186 | int rv; | |
3187 | ||
e6b3ea83 | 3188 | D_ASSERT(current != mdev->tconn->worker.task); |
b411b363 | 3189 | |
20ceb2b2 LE |
3190 | if ((flags & BM_LOCKED_SET_ALLOWED) == 0) |
3191 | drbd_suspend_io(mdev); | |
b411b363 | 3192 | |
20ceb2b2 | 3193 | drbd_bm_lock(mdev, why, flags); |
b411b363 PR |
3194 | rv = io_fn(mdev); |
3195 | drbd_bm_unlock(mdev); | |
3196 | ||
20ceb2b2 LE |
3197 | if ((flags & BM_LOCKED_SET_ALLOWED) == 0) |
3198 | drbd_resume_io(mdev); | |
b411b363 PR |
3199 | |
3200 | return rv; | |
3201 | } | |
3202 | ||
3203 | void drbd_md_set_flag(struct drbd_conf *mdev, int flag) __must_hold(local) | |
3204 | { | |
3205 | if ((mdev->ldev->md.flags & flag) != flag) { | |
3206 | drbd_md_mark_dirty(mdev); | |
3207 | mdev->ldev->md.flags |= flag; | |
3208 | } | |
3209 | } | |
3210 | ||
3211 | void drbd_md_clear_flag(struct drbd_conf *mdev, int flag) __must_hold(local) | |
3212 | { | |
3213 | if ((mdev->ldev->md.flags & flag) != 0) { | |
3214 | drbd_md_mark_dirty(mdev); | |
3215 | mdev->ldev->md.flags &= ~flag; | |
3216 | } | |
3217 | } | |
3218 | int drbd_md_test_flag(struct drbd_backing_dev *bdev, int flag) | |
3219 | { | |
3220 | return (bdev->md.flags & flag) != 0; | |
3221 | } | |
3222 | ||
3223 | static void md_sync_timer_fn(unsigned long data) | |
3224 | { | |
3225 | struct drbd_conf *mdev = (struct drbd_conf *) data; | |
3226 | ||
e42325a5 | 3227 | drbd_queue_work_front(&mdev->tconn->data.work, &mdev->md_sync_work); |
b411b363 PR |
3228 | } |
3229 | ||
99920dc5 | 3230 | static int w_md_sync(struct drbd_work *w, int unused) |
b411b363 | 3231 | { |
00d56944 PR |
3232 | struct drbd_conf *mdev = w->mdev; |
3233 | ||
b411b363 | 3234 | dev_warn(DEV, "md_sync_timer expired! Worker calls drbd_md_sync().\n"); |
ee15b038 LE |
3235 | #ifdef DEBUG |
3236 | dev_warn(DEV, "last md_mark_dirty: %s:%u\n", | |
3237 | mdev->last_md_mark_dirty.func, mdev->last_md_mark_dirty.line); | |
3238 | #endif | |
b411b363 | 3239 | drbd_md_sync(mdev); |
99920dc5 | 3240 | return 0; |
b411b363 PR |
3241 | } |
3242 | ||
d8763023 | 3243 | const char *cmdname(enum drbd_packet cmd) |
f2ad9063 AG |
3244 | { |
3245 | /* THINK may need to become several global tables | |
3246 | * when we want to support more than | |
3247 | * one PRO_VERSION */ | |
3248 | static const char *cmdnames[] = { | |
3249 | [P_DATA] = "Data", | |
3250 | [P_DATA_REPLY] = "DataReply", | |
3251 | [P_RS_DATA_REPLY] = "RSDataReply", | |
3252 | [P_BARRIER] = "Barrier", | |
3253 | [P_BITMAP] = "ReportBitMap", | |
3254 | [P_BECOME_SYNC_TARGET] = "BecomeSyncTarget", | |
3255 | [P_BECOME_SYNC_SOURCE] = "BecomeSyncSource", | |
3256 | [P_UNPLUG_REMOTE] = "UnplugRemote", | |
3257 | [P_DATA_REQUEST] = "DataRequest", | |
3258 | [P_RS_DATA_REQUEST] = "RSDataRequest", | |
3259 | [P_SYNC_PARAM] = "SyncParam", | |
3260 | [P_SYNC_PARAM89] = "SyncParam89", | |
3261 | [P_PROTOCOL] = "ReportProtocol", | |
3262 | [P_UUIDS] = "ReportUUIDs", | |
3263 | [P_SIZES] = "ReportSizes", | |
3264 | [P_STATE] = "ReportState", | |
3265 | [P_SYNC_UUID] = "ReportSyncUUID", | |
3266 | [P_AUTH_CHALLENGE] = "AuthChallenge", | |
3267 | [P_AUTH_RESPONSE] = "AuthResponse", | |
3268 | [P_PING] = "Ping", | |
3269 | [P_PING_ACK] = "PingAck", | |
3270 | [P_RECV_ACK] = "RecvAck", | |
3271 | [P_WRITE_ACK] = "WriteAck", | |
3272 | [P_RS_WRITE_ACK] = "RSWriteAck", | |
7be8da07 | 3273 | [P_DISCARD_WRITE] = "DiscardWrite", |
f2ad9063 AG |
3274 | [P_NEG_ACK] = "NegAck", |
3275 | [P_NEG_DREPLY] = "NegDReply", | |
3276 | [P_NEG_RS_DREPLY] = "NegRSDReply", | |
3277 | [P_BARRIER_ACK] = "BarrierAck", | |
3278 | [P_STATE_CHG_REQ] = "StateChgRequest", | |
3279 | [P_STATE_CHG_REPLY] = "StateChgReply", | |
3280 | [P_OV_REQUEST] = "OVRequest", | |
3281 | [P_OV_REPLY] = "OVReply", | |
3282 | [P_OV_RESULT] = "OVResult", | |
3283 | [P_CSUM_RS_REQUEST] = "CsumRSRequest", | |
3284 | [P_RS_IS_IN_SYNC] = "CsumRSIsInSync", | |
3285 | [P_COMPRESSED_BITMAP] = "CBitmap", | |
3286 | [P_DELAY_PROBE] = "DelayProbe", | |
3287 | [P_OUT_OF_SYNC] = "OutOfSync", | |
7be8da07 | 3288 | [P_RETRY_WRITE] = "RetryWrite", |
ae25b336 LE |
3289 | [P_RS_CANCEL] = "RSCancel", |
3290 | [P_CONN_ST_CHG_REQ] = "conn_st_chg_req", | |
3291 | [P_CONN_ST_CHG_REPLY] = "conn_st_chg_reply", | |
3292 | ||
3293 | /* enum drbd_packet, but not commands - obsoleted flags: | |
3294 | * P_MAY_IGNORE | |
3295 | * P_MAX_OPT_CMD | |
3296 | */ | |
f2ad9063 AG |
3297 | }; |
3298 | ||
ae25b336 | 3299 | /* too big for the array: 0xfffX */ |
e5d6f33a AG |
3300 | if (cmd == P_INITIAL_META) |
3301 | return "InitialMeta"; | |
3302 | if (cmd == P_INITIAL_DATA) | |
3303 | return "InitialData"; | |
6038178e AG |
3304 | if (cmd == P_CONNECTION_FEATURES) |
3305 | return "ConnectionFeatures"; | |
6e849ce8 | 3306 | if (cmd >= ARRAY_SIZE(cmdnames)) |
f2ad9063 AG |
3307 | return "Unknown"; |
3308 | return cmdnames[cmd]; | |
3309 | } | |
3310 | ||
7be8da07 AG |
3311 | /** |
3312 | * drbd_wait_misc - wait for a request to make progress | |
3313 | * @mdev: device associated with the request | |
3314 | * @i: the struct drbd_interval embedded in struct drbd_request or | |
3315 | * struct drbd_peer_request | |
3316 | */ | |
3317 | int drbd_wait_misc(struct drbd_conf *mdev, struct drbd_interval *i) | |
3318 | { | |
44ed167d | 3319 | struct net_conf *nc; |
7be8da07 AG |
3320 | DEFINE_WAIT(wait); |
3321 | long timeout; | |
3322 | ||
44ed167d PR |
3323 | rcu_read_lock(); |
3324 | nc = rcu_dereference(mdev->tconn->net_conf); | |
3325 | if (!nc) { | |
3326 | rcu_read_unlock(); | |
7be8da07 | 3327 | return -ETIMEDOUT; |
44ed167d PR |
3328 | } |
3329 | timeout = nc->ko_count ? nc->timeout * HZ / 10 * nc->ko_count : MAX_SCHEDULE_TIMEOUT; | |
3330 | rcu_read_unlock(); | |
7be8da07 AG |
3331 | |
3332 | /* Indicate to wake up mdev->misc_wait on progress. */ | |
3333 | i->waiting = true; | |
3334 | prepare_to_wait(&mdev->misc_wait, &wait, TASK_INTERRUPTIBLE); | |
3335 | spin_unlock_irq(&mdev->tconn->req_lock); | |
3336 | timeout = schedule_timeout(timeout); | |
3337 | finish_wait(&mdev->misc_wait, &wait); | |
3338 | spin_lock_irq(&mdev->tconn->req_lock); | |
3339 | if (!timeout || mdev->state.conn < C_CONNECTED) | |
3340 | return -ETIMEDOUT; | |
3341 | if (signal_pending(current)) | |
3342 | return -ERESTARTSYS; | |
3343 | return 0; | |
3344 | } | |
3345 | ||
b411b363 PR |
3346 | #ifdef CONFIG_DRBD_FAULT_INJECTION |
3347 | /* Fault insertion support including random number generator shamelessly | |
3348 | * stolen from kernel/rcutorture.c */ | |
3349 | struct fault_random_state { | |
3350 | unsigned long state; | |
3351 | unsigned long count; | |
3352 | }; | |
3353 | ||
3354 | #define FAULT_RANDOM_MULT 39916801 /* prime */ | |
3355 | #define FAULT_RANDOM_ADD 479001701 /* prime */ | |
3356 | #define FAULT_RANDOM_REFRESH 10000 | |
3357 | ||
3358 | /* | |
3359 | * Crude but fast random-number generator. Uses a linear congruential | |
3360 | * generator, with occasional help from get_random_bytes(). | |
3361 | */ | |
3362 | static unsigned long | |
3363 | _drbd_fault_random(struct fault_random_state *rsp) | |
3364 | { | |
3365 | long refresh; | |
3366 | ||
49829ea7 | 3367 | if (!rsp->count--) { |
b411b363 PR |
3368 | get_random_bytes(&refresh, sizeof(refresh)); |
3369 | rsp->state += refresh; | |
3370 | rsp->count = FAULT_RANDOM_REFRESH; | |
3371 | } | |
3372 | rsp->state = rsp->state * FAULT_RANDOM_MULT + FAULT_RANDOM_ADD; | |
3373 | return swahw32(rsp->state); | |
3374 | } | |
3375 | ||
3376 | static char * | |
3377 | _drbd_fault_str(unsigned int type) { | |
3378 | static char *_faults[] = { | |
3379 | [DRBD_FAULT_MD_WR] = "Meta-data write", | |
3380 | [DRBD_FAULT_MD_RD] = "Meta-data read", | |
3381 | [DRBD_FAULT_RS_WR] = "Resync write", | |
3382 | [DRBD_FAULT_RS_RD] = "Resync read", | |
3383 | [DRBD_FAULT_DT_WR] = "Data write", | |
3384 | [DRBD_FAULT_DT_RD] = "Data read", | |
3385 | [DRBD_FAULT_DT_RA] = "Data read ahead", | |
3386 | [DRBD_FAULT_BM_ALLOC] = "BM allocation", | |
6b4388ac PR |
3387 | [DRBD_FAULT_AL_EE] = "EE allocation", |
3388 | [DRBD_FAULT_RECEIVE] = "receive data corruption", | |
b411b363 PR |
3389 | }; |
3390 | ||
3391 | return (type < DRBD_FAULT_MAX) ? _faults[type] : "**Unknown**"; | |
3392 | } | |
3393 | ||
3394 | unsigned int | |
3395 | _drbd_insert_fault(struct drbd_conf *mdev, unsigned int type) | |
3396 | { | |
3397 | static struct fault_random_state rrs = {0, 0}; | |
3398 | ||
3399 | unsigned int ret = ( | |
3400 | (fault_devs == 0 || | |
3401 | ((1 << mdev_to_minor(mdev)) & fault_devs) != 0) && | |
3402 | (((_drbd_fault_random(&rrs) % 100) + 1) <= fault_rate)); | |
3403 | ||
3404 | if (ret) { | |
3405 | fault_count++; | |
3406 | ||
7383506c | 3407 | if (__ratelimit(&drbd_ratelimit_state)) |
b411b363 PR |
3408 | dev_warn(DEV, "***Simulating %s failure\n", |
3409 | _drbd_fault_str(type)); | |
3410 | } | |
3411 | ||
3412 | return ret; | |
3413 | } | |
3414 | #endif | |
3415 | ||
3416 | const char *drbd_buildtag(void) | |
3417 | { | |
3418 | /* DRBD built from external sources has here a reference to the | |
3419 | git hash of the source code. */ | |
3420 | ||
3421 | static char buildtag[38] = "\0uilt-in"; | |
3422 | ||
3423 | if (buildtag[0] == 0) { | |
3424 | #ifdef CONFIG_MODULES | |
3425 | if (THIS_MODULE != NULL) | |
3426 | sprintf(buildtag, "srcversion: %-24s", THIS_MODULE->srcversion); | |
3427 | else | |
3428 | #endif | |
3429 | buildtag[0] = 'b'; | |
3430 | } | |
3431 | ||
3432 | return buildtag; | |
3433 | } | |
3434 | ||
3435 | module_init(drbd_init) | |
3436 | module_exit(drbd_cleanup) | |
3437 | ||
b411b363 PR |
3438 | EXPORT_SYMBOL(drbd_conn_str); |
3439 | EXPORT_SYMBOL(drbd_role_str); | |
3440 | EXPORT_SYMBOL(drbd_disk_str); | |
3441 | EXPORT_SYMBOL(drbd_set_st_err_str); |