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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 PR |
29 | #include <linux/module.h> |
30 | #include <linux/version.h> | |
31 | #include <linux/drbd.h> | |
32 | #include <asm/uaccess.h> | |
33 | #include <asm/types.h> | |
34 | #include <net/sock.h> | |
35 | #include <linux/ctype.h> | |
36 | #include <linux/smp_lock.h> | |
37 | #include <linux/fs.h> | |
38 | #include <linux/file.h> | |
39 | #include <linux/proc_fs.h> | |
40 | #include <linux/init.h> | |
41 | #include <linux/mm.h> | |
42 | #include <linux/memcontrol.h> | |
43 | #include <linux/mm_inline.h> | |
44 | #include <linux/slab.h> | |
45 | #include <linux/random.h> | |
46 | #include <linux/reboot.h> | |
47 | #include <linux/notifier.h> | |
48 | #include <linux/kthread.h> | |
49 | ||
50 | #define __KERNEL_SYSCALLS__ | |
51 | #include <linux/unistd.h> | |
52 | #include <linux/vmalloc.h> | |
53 | ||
54 | #include <linux/drbd_limits.h> | |
55 | #include "drbd_int.h" | |
b411b363 PR |
56 | #include "drbd_req.h" /* only for _req_mod in tl_release and tl_clear */ |
57 | ||
58 | #include "drbd_vli.h" | |
59 | ||
60 | struct after_state_chg_work { | |
61 | struct drbd_work w; | |
62 | union drbd_state os; | |
63 | union drbd_state ns; | |
64 | enum chg_state_flags flags; | |
65 | struct completion *done; | |
66 | }; | |
67 | ||
68 | int drbdd_init(struct drbd_thread *); | |
69 | int drbd_worker(struct drbd_thread *); | |
70 | int drbd_asender(struct drbd_thread *); | |
71 | ||
72 | int drbd_init(void); | |
73 | static int drbd_open(struct block_device *bdev, fmode_t mode); | |
74 | static int drbd_release(struct gendisk *gd, fmode_t mode); | |
75 | static int w_after_state_ch(struct drbd_conf *mdev, struct drbd_work *w, int unused); | |
76 | static void after_state_ch(struct drbd_conf *mdev, union drbd_state os, | |
77 | union drbd_state ns, enum chg_state_flags flags); | |
78 | static int w_md_sync(struct drbd_conf *mdev, struct drbd_work *w, int unused); | |
79 | static void md_sync_timer_fn(unsigned long data); | |
80 | static int w_bitmap_io(struct drbd_conf *mdev, struct drbd_work *w, int unused); | |
81 | ||
b411b363 PR |
82 | MODULE_AUTHOR("Philipp Reisner <phil@linbit.com>, " |
83 | "Lars Ellenberg <lars@linbit.com>"); | |
84 | MODULE_DESCRIPTION("drbd - Distributed Replicated Block Device v" REL_VERSION); | |
85 | MODULE_VERSION(REL_VERSION); | |
86 | MODULE_LICENSE("GPL"); | |
87 | MODULE_PARM_DESC(minor_count, "Maximum number of drbd devices (1-255)"); | |
88 | MODULE_ALIAS_BLOCKDEV_MAJOR(DRBD_MAJOR); | |
89 | ||
90 | #include <linux/moduleparam.h> | |
91 | /* allow_open_on_secondary */ | |
92 | MODULE_PARM_DESC(allow_oos, "DONT USE!"); | |
93 | /* thanks to these macros, if compiled into the kernel (not-module), | |
94 | * this becomes the boot parameter drbd.minor_count */ | |
95 | module_param(minor_count, uint, 0444); | |
96 | module_param(disable_sendpage, bool, 0644); | |
97 | module_param(allow_oos, bool, 0); | |
98 | module_param(cn_idx, uint, 0444); | |
99 | module_param(proc_details, int, 0644); | |
100 | ||
101 | #ifdef CONFIG_DRBD_FAULT_INJECTION | |
102 | int enable_faults; | |
103 | int fault_rate; | |
104 | static int fault_count; | |
105 | int fault_devs; | |
106 | /* bitmap of enabled faults */ | |
107 | module_param(enable_faults, int, 0664); | |
108 | /* fault rate % value - applies to all enabled faults */ | |
109 | module_param(fault_rate, int, 0664); | |
110 | /* count of faults inserted */ | |
111 | module_param(fault_count, int, 0664); | |
112 | /* bitmap of devices to insert faults on */ | |
113 | module_param(fault_devs, int, 0644); | |
114 | #endif | |
115 | ||
116 | /* module parameter, defined */ | |
117 | unsigned int minor_count = 32; | |
118 | int disable_sendpage; | |
119 | int allow_oos; | |
120 | unsigned int cn_idx = CN_IDX_DRBD; | |
121 | int proc_details; /* Detail level in proc drbd*/ | |
122 | ||
123 | /* Module parameter for setting the user mode helper program | |
124 | * to run. Default is /sbin/drbdadm */ | |
125 | char usermode_helper[80] = "/sbin/drbdadm"; | |
126 | ||
127 | module_param_string(usermode_helper, usermode_helper, sizeof(usermode_helper), 0644); | |
128 | ||
129 | /* in 2.6.x, our device mapping and config info contains our virtual gendisks | |
130 | * as member "struct gendisk *vdisk;" | |
131 | */ | |
132 | struct drbd_conf **minor_table; | |
133 | ||
134 | struct kmem_cache *drbd_request_cache; | |
135 | struct kmem_cache *drbd_ee_cache; /* epoch entries */ | |
136 | struct kmem_cache *drbd_bm_ext_cache; /* bitmap extents */ | |
137 | struct kmem_cache *drbd_al_ext_cache; /* activity log extents */ | |
138 | mempool_t *drbd_request_mempool; | |
139 | mempool_t *drbd_ee_mempool; | |
140 | ||
141 | /* I do not use a standard mempool, because: | |
142 | 1) I want to hand out the pre-allocated objects first. | |
143 | 2) I want to be able to interrupt sleeping allocation with a signal. | |
144 | Note: This is a single linked list, the next pointer is the private | |
145 | member of struct page. | |
146 | */ | |
147 | struct page *drbd_pp_pool; | |
148 | spinlock_t drbd_pp_lock; | |
149 | int drbd_pp_vacant; | |
150 | wait_queue_head_t drbd_pp_wait; | |
151 | ||
152 | DEFINE_RATELIMIT_STATE(drbd_ratelimit_state, 5 * HZ, 5); | |
153 | ||
154 | static struct block_device_operations drbd_ops = { | |
155 | .owner = THIS_MODULE, | |
156 | .open = drbd_open, | |
157 | .release = drbd_release, | |
158 | }; | |
159 | ||
160 | #define ARRY_SIZE(A) (sizeof(A)/sizeof(A[0])) | |
161 | ||
162 | #ifdef __CHECKER__ | |
163 | /* When checking with sparse, and this is an inline function, sparse will | |
164 | give tons of false positives. When this is a real functions sparse works. | |
165 | */ | |
166 | int _get_ldev_if_state(struct drbd_conf *mdev, enum drbd_disk_state mins) | |
167 | { | |
168 | int io_allowed; | |
169 | ||
170 | atomic_inc(&mdev->local_cnt); | |
171 | io_allowed = (mdev->state.disk >= mins); | |
172 | if (!io_allowed) { | |
173 | if (atomic_dec_and_test(&mdev->local_cnt)) | |
174 | wake_up(&mdev->misc_wait); | |
175 | } | |
176 | return io_allowed; | |
177 | } | |
178 | ||
179 | #endif | |
180 | ||
181 | /** | |
182 | * DOC: The transfer log | |
183 | * | |
184 | * The transfer log is a single linked list of &struct drbd_tl_epoch objects. | |
185 | * mdev->newest_tle points to the head, mdev->oldest_tle points to the tail | |
186 | * of the list. There is always at least one &struct drbd_tl_epoch object. | |
187 | * | |
188 | * Each &struct drbd_tl_epoch has a circular double linked list of requests | |
189 | * attached. | |
190 | */ | |
191 | static int tl_init(struct drbd_conf *mdev) | |
192 | { | |
193 | struct drbd_tl_epoch *b; | |
194 | ||
195 | /* during device minor initialization, we may well use GFP_KERNEL */ | |
196 | b = kmalloc(sizeof(struct drbd_tl_epoch), GFP_KERNEL); | |
197 | if (!b) | |
198 | return 0; | |
199 | INIT_LIST_HEAD(&b->requests); | |
200 | INIT_LIST_HEAD(&b->w.list); | |
201 | b->next = NULL; | |
202 | b->br_number = 4711; | |
203 | b->n_req = 0; | |
204 | b->w.cb = NULL; /* if this is != NULL, we need to dec_ap_pending in tl_clear */ | |
205 | ||
206 | mdev->oldest_tle = b; | |
207 | mdev->newest_tle = b; | |
208 | INIT_LIST_HEAD(&mdev->out_of_sequence_requests); | |
209 | ||
210 | mdev->tl_hash = NULL; | |
211 | mdev->tl_hash_s = 0; | |
212 | ||
213 | return 1; | |
214 | } | |
215 | ||
216 | static void tl_cleanup(struct drbd_conf *mdev) | |
217 | { | |
218 | D_ASSERT(mdev->oldest_tle == mdev->newest_tle); | |
219 | D_ASSERT(list_empty(&mdev->out_of_sequence_requests)); | |
220 | kfree(mdev->oldest_tle); | |
221 | mdev->oldest_tle = NULL; | |
222 | kfree(mdev->unused_spare_tle); | |
223 | mdev->unused_spare_tle = NULL; | |
224 | kfree(mdev->tl_hash); | |
225 | mdev->tl_hash = NULL; | |
226 | mdev->tl_hash_s = 0; | |
227 | } | |
228 | ||
229 | /** | |
230 | * _tl_add_barrier() - Adds a barrier to the transfer log | |
231 | * @mdev: DRBD device. | |
232 | * @new: Barrier to be added before the current head of the TL. | |
233 | * | |
234 | * The caller must hold the req_lock. | |
235 | */ | |
236 | void _tl_add_barrier(struct drbd_conf *mdev, struct drbd_tl_epoch *new) | |
237 | { | |
238 | struct drbd_tl_epoch *newest_before; | |
239 | ||
240 | INIT_LIST_HEAD(&new->requests); | |
241 | INIT_LIST_HEAD(&new->w.list); | |
242 | new->w.cb = NULL; /* if this is != NULL, we need to dec_ap_pending in tl_clear */ | |
243 | new->next = NULL; | |
244 | new->n_req = 0; | |
245 | ||
246 | newest_before = mdev->newest_tle; | |
247 | /* never send a barrier number == 0, because that is special-cased | |
248 | * when using TCQ for our write ordering code */ | |
249 | new->br_number = (newest_before->br_number+1) ?: 1; | |
250 | if (mdev->newest_tle != new) { | |
251 | mdev->newest_tle->next = new; | |
252 | mdev->newest_tle = new; | |
253 | } | |
254 | } | |
255 | ||
256 | /** | |
257 | * tl_release() - Free or recycle the oldest &struct drbd_tl_epoch object of the TL | |
258 | * @mdev: DRBD device. | |
259 | * @barrier_nr: Expected identifier of the DRBD write barrier packet. | |
260 | * @set_size: Expected number of requests before that barrier. | |
261 | * | |
262 | * In case the passed barrier_nr or set_size does not match the oldest | |
263 | * &struct drbd_tl_epoch objects this function will cause a termination | |
264 | * of the connection. | |
265 | */ | |
266 | void tl_release(struct drbd_conf *mdev, unsigned int barrier_nr, | |
267 | unsigned int set_size) | |
268 | { | |
269 | struct drbd_tl_epoch *b, *nob; /* next old barrier */ | |
270 | struct list_head *le, *tle; | |
271 | struct drbd_request *r; | |
272 | ||
273 | spin_lock_irq(&mdev->req_lock); | |
274 | ||
275 | b = mdev->oldest_tle; | |
276 | ||
277 | /* first some paranoia code */ | |
278 | if (b == NULL) { | |
279 | dev_err(DEV, "BAD! BarrierAck #%u received, but no epoch in tl!?\n", | |
280 | barrier_nr); | |
281 | goto bail; | |
282 | } | |
283 | if (b->br_number != barrier_nr) { | |
284 | dev_err(DEV, "BAD! BarrierAck #%u received, expected #%u!\n", | |
285 | barrier_nr, b->br_number); | |
286 | goto bail; | |
287 | } | |
288 | if (b->n_req != set_size) { | |
289 | dev_err(DEV, "BAD! BarrierAck #%u received with n_req=%u, expected n_req=%u!\n", | |
290 | barrier_nr, set_size, b->n_req); | |
291 | goto bail; | |
292 | } | |
293 | ||
294 | /* Clean up list of requests processed during current epoch */ | |
295 | list_for_each_safe(le, tle, &b->requests) { | |
296 | r = list_entry(le, struct drbd_request, tl_requests); | |
297 | _req_mod(r, barrier_acked); | |
298 | } | |
299 | /* There could be requests on the list waiting for completion | |
300 | of the write to the local disk. To avoid corruptions of | |
301 | slab's data structures we have to remove the lists head. | |
302 | ||
303 | Also there could have been a barrier ack out of sequence, overtaking | |
304 | the write acks - which would be a bug and violating write ordering. | |
305 | To not deadlock in case we lose connection while such requests are | |
306 | still pending, we need some way to find them for the | |
307 | _req_mode(connection_lost_while_pending). | |
308 | ||
309 | These have been list_move'd to the out_of_sequence_requests list in | |
310 | _req_mod(, barrier_acked) above. | |
311 | */ | |
312 | list_del_init(&b->requests); | |
313 | ||
314 | nob = b->next; | |
315 | if (test_and_clear_bit(CREATE_BARRIER, &mdev->flags)) { | |
316 | _tl_add_barrier(mdev, b); | |
317 | if (nob) | |
318 | mdev->oldest_tle = nob; | |
319 | /* if nob == NULL b was the only barrier, and becomes the new | |
320 | barrier. Therefore mdev->oldest_tle points already to b */ | |
321 | } else { | |
322 | D_ASSERT(nob != NULL); | |
323 | mdev->oldest_tle = nob; | |
324 | kfree(b); | |
325 | } | |
326 | ||
327 | spin_unlock_irq(&mdev->req_lock); | |
328 | dec_ap_pending(mdev); | |
329 | ||
330 | return; | |
331 | ||
332 | bail: | |
333 | spin_unlock_irq(&mdev->req_lock); | |
334 | drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); | |
335 | } | |
336 | ||
337 | ||
338 | /** | |
339 | * tl_clear() - Clears all requests and &struct drbd_tl_epoch objects out of the TL | |
340 | * @mdev: DRBD device. | |
341 | * | |
342 | * This is called after the connection to the peer was lost. The storage covered | |
343 | * by the requests on the transfer gets marked as our of sync. Called from the | |
344 | * receiver thread and the worker thread. | |
345 | */ | |
346 | void tl_clear(struct drbd_conf *mdev) | |
347 | { | |
348 | struct drbd_tl_epoch *b, *tmp; | |
349 | struct list_head *le, *tle; | |
350 | struct drbd_request *r; | |
351 | int new_initial_bnr = net_random(); | |
352 | ||
353 | spin_lock_irq(&mdev->req_lock); | |
354 | ||
355 | b = mdev->oldest_tle; | |
356 | while (b) { | |
357 | list_for_each_safe(le, tle, &b->requests) { | |
358 | r = list_entry(le, struct drbd_request, tl_requests); | |
359 | /* It would be nice to complete outside of spinlock. | |
360 | * But this is easier for now. */ | |
361 | _req_mod(r, connection_lost_while_pending); | |
362 | } | |
363 | tmp = b->next; | |
364 | ||
365 | /* there could still be requests on that ring list, | |
366 | * in case local io is still pending */ | |
367 | list_del(&b->requests); | |
368 | ||
369 | /* dec_ap_pending corresponding to queue_barrier. | |
370 | * the newest barrier may not have been queued yet, | |
371 | * in which case w.cb is still NULL. */ | |
372 | if (b->w.cb != NULL) | |
373 | dec_ap_pending(mdev); | |
374 | ||
375 | if (b == mdev->newest_tle) { | |
376 | /* recycle, but reinit! */ | |
377 | D_ASSERT(tmp == NULL); | |
378 | INIT_LIST_HEAD(&b->requests); | |
379 | INIT_LIST_HEAD(&b->w.list); | |
380 | b->w.cb = NULL; | |
381 | b->br_number = new_initial_bnr; | |
382 | b->n_req = 0; | |
383 | ||
384 | mdev->oldest_tle = b; | |
385 | break; | |
386 | } | |
387 | kfree(b); | |
388 | b = tmp; | |
389 | } | |
390 | ||
391 | /* we expect this list to be empty. */ | |
392 | D_ASSERT(list_empty(&mdev->out_of_sequence_requests)); | |
393 | ||
394 | /* but just in case, clean it up anyways! */ | |
395 | list_for_each_safe(le, tle, &mdev->out_of_sequence_requests) { | |
396 | r = list_entry(le, struct drbd_request, tl_requests); | |
397 | /* It would be nice to complete outside of spinlock. | |
398 | * But this is easier for now. */ | |
399 | _req_mod(r, connection_lost_while_pending); | |
400 | } | |
401 | ||
402 | /* ensure bit indicating barrier is required is clear */ | |
403 | clear_bit(CREATE_BARRIER, &mdev->flags); | |
404 | ||
405 | spin_unlock_irq(&mdev->req_lock); | |
406 | } | |
407 | ||
408 | /** | |
409 | * cl_wide_st_chg() - TRUE if the state change is a cluster wide one | |
410 | * @mdev: DRBD device. | |
411 | * @os: old (current) state. | |
412 | * @ns: new (wanted) state. | |
413 | */ | |
414 | static int cl_wide_st_chg(struct drbd_conf *mdev, | |
415 | union drbd_state os, union drbd_state ns) | |
416 | { | |
417 | return (os.conn >= C_CONNECTED && ns.conn >= C_CONNECTED && | |
418 | ((os.role != R_PRIMARY && ns.role == R_PRIMARY) || | |
419 | (os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) || | |
420 | (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S) || | |
421 | (os.disk != D_DISKLESS && ns.disk == D_DISKLESS))) || | |
422 | (os.conn >= C_CONNECTED && ns.conn == C_DISCONNECTING) || | |
423 | (os.conn == C_CONNECTED && ns.conn == C_VERIFY_S); | |
424 | } | |
425 | ||
426 | int drbd_change_state(struct drbd_conf *mdev, enum chg_state_flags f, | |
427 | union drbd_state mask, union drbd_state val) | |
428 | { | |
429 | unsigned long flags; | |
430 | union drbd_state os, ns; | |
431 | int rv; | |
432 | ||
433 | spin_lock_irqsave(&mdev->req_lock, flags); | |
434 | os = mdev->state; | |
435 | ns.i = (os.i & ~mask.i) | val.i; | |
436 | rv = _drbd_set_state(mdev, ns, f, NULL); | |
437 | ns = mdev->state; | |
438 | spin_unlock_irqrestore(&mdev->req_lock, flags); | |
439 | ||
440 | return rv; | |
441 | } | |
442 | ||
443 | /** | |
444 | * drbd_force_state() - Impose a change which happens outside our control on our state | |
445 | * @mdev: DRBD device. | |
446 | * @mask: mask of state bits to change. | |
447 | * @val: value of new state bits. | |
448 | */ | |
449 | void drbd_force_state(struct drbd_conf *mdev, | |
450 | union drbd_state mask, union drbd_state val) | |
451 | { | |
452 | drbd_change_state(mdev, CS_HARD, mask, val); | |
453 | } | |
454 | ||
455 | static int is_valid_state(struct drbd_conf *mdev, union drbd_state ns); | |
456 | static int is_valid_state_transition(struct drbd_conf *, | |
457 | union drbd_state, union drbd_state); | |
458 | static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state os, | |
459 | union drbd_state ns, int *warn_sync_abort); | |
460 | int drbd_send_state_req(struct drbd_conf *, | |
461 | union drbd_state, union drbd_state); | |
462 | ||
463 | static enum drbd_state_ret_codes _req_st_cond(struct drbd_conf *mdev, | |
464 | union drbd_state mask, union drbd_state val) | |
465 | { | |
466 | union drbd_state os, ns; | |
467 | unsigned long flags; | |
468 | int rv; | |
469 | ||
470 | if (test_and_clear_bit(CL_ST_CHG_SUCCESS, &mdev->flags)) | |
471 | return SS_CW_SUCCESS; | |
472 | ||
473 | if (test_and_clear_bit(CL_ST_CHG_FAIL, &mdev->flags)) | |
474 | return SS_CW_FAILED_BY_PEER; | |
475 | ||
476 | rv = 0; | |
477 | spin_lock_irqsave(&mdev->req_lock, flags); | |
478 | os = mdev->state; | |
479 | ns.i = (os.i & ~mask.i) | val.i; | |
480 | ns = sanitize_state(mdev, os, ns, NULL); | |
481 | ||
482 | if (!cl_wide_st_chg(mdev, os, ns)) | |
483 | rv = SS_CW_NO_NEED; | |
484 | if (!rv) { | |
485 | rv = is_valid_state(mdev, ns); | |
486 | if (rv == SS_SUCCESS) { | |
487 | rv = is_valid_state_transition(mdev, ns, os); | |
488 | if (rv == SS_SUCCESS) | |
489 | rv = 0; /* cont waiting, otherwise fail. */ | |
490 | } | |
491 | } | |
492 | spin_unlock_irqrestore(&mdev->req_lock, flags); | |
493 | ||
494 | return rv; | |
495 | } | |
496 | ||
497 | /** | |
498 | * drbd_req_state() - Perform an eventually cluster wide state change | |
499 | * @mdev: DRBD device. | |
500 | * @mask: mask of state bits to change. | |
501 | * @val: value of new state bits. | |
502 | * @f: flags | |
503 | * | |
504 | * Should not be called directly, use drbd_request_state() or | |
505 | * _drbd_request_state(). | |
506 | */ | |
507 | static int drbd_req_state(struct drbd_conf *mdev, | |
508 | union drbd_state mask, union drbd_state val, | |
509 | enum chg_state_flags f) | |
510 | { | |
511 | struct completion done; | |
512 | unsigned long flags; | |
513 | union drbd_state os, ns; | |
514 | int rv; | |
515 | ||
516 | init_completion(&done); | |
517 | ||
518 | if (f & CS_SERIALIZE) | |
519 | mutex_lock(&mdev->state_mutex); | |
520 | ||
521 | spin_lock_irqsave(&mdev->req_lock, flags); | |
522 | os = mdev->state; | |
523 | ns.i = (os.i & ~mask.i) | val.i; | |
524 | ns = sanitize_state(mdev, os, ns, NULL); | |
525 | ||
526 | if (cl_wide_st_chg(mdev, os, ns)) { | |
527 | rv = is_valid_state(mdev, ns); | |
528 | if (rv == SS_SUCCESS) | |
529 | rv = is_valid_state_transition(mdev, ns, os); | |
530 | spin_unlock_irqrestore(&mdev->req_lock, flags); | |
531 | ||
532 | if (rv < SS_SUCCESS) { | |
533 | if (f & CS_VERBOSE) | |
534 | print_st_err(mdev, os, ns, rv); | |
535 | goto abort; | |
536 | } | |
537 | ||
538 | drbd_state_lock(mdev); | |
539 | if (!drbd_send_state_req(mdev, mask, val)) { | |
540 | drbd_state_unlock(mdev); | |
541 | rv = SS_CW_FAILED_BY_PEER; | |
542 | if (f & CS_VERBOSE) | |
543 | print_st_err(mdev, os, ns, rv); | |
544 | goto abort; | |
545 | } | |
546 | ||
547 | wait_event(mdev->state_wait, | |
548 | (rv = _req_st_cond(mdev, mask, val))); | |
549 | ||
550 | if (rv < SS_SUCCESS) { | |
551 | drbd_state_unlock(mdev); | |
552 | if (f & CS_VERBOSE) | |
553 | print_st_err(mdev, os, ns, rv); | |
554 | goto abort; | |
555 | } | |
556 | spin_lock_irqsave(&mdev->req_lock, flags); | |
557 | os = mdev->state; | |
558 | ns.i = (os.i & ~mask.i) | val.i; | |
559 | rv = _drbd_set_state(mdev, ns, f, &done); | |
560 | drbd_state_unlock(mdev); | |
561 | } else { | |
562 | rv = _drbd_set_state(mdev, ns, f, &done); | |
563 | } | |
564 | ||
565 | spin_unlock_irqrestore(&mdev->req_lock, flags); | |
566 | ||
567 | if (f & CS_WAIT_COMPLETE && rv == SS_SUCCESS) { | |
568 | D_ASSERT(current != mdev->worker.task); | |
569 | wait_for_completion(&done); | |
570 | } | |
571 | ||
572 | abort: | |
573 | if (f & CS_SERIALIZE) | |
574 | mutex_unlock(&mdev->state_mutex); | |
575 | ||
576 | return rv; | |
577 | } | |
578 | ||
579 | /** | |
580 | * _drbd_request_state() - Request a state change (with flags) | |
581 | * @mdev: DRBD device. | |
582 | * @mask: mask of state bits to change. | |
583 | * @val: value of new state bits. | |
584 | * @f: flags | |
585 | * | |
586 | * Cousin of drbd_request_state(), useful with the CS_WAIT_COMPLETE | |
587 | * flag, or when logging of failed state change requests is not desired. | |
588 | */ | |
589 | int _drbd_request_state(struct drbd_conf *mdev, union drbd_state mask, | |
590 | union drbd_state val, enum chg_state_flags f) | |
591 | { | |
592 | int rv; | |
593 | ||
594 | wait_event(mdev->state_wait, | |
595 | (rv = drbd_req_state(mdev, mask, val, f)) != SS_IN_TRANSIENT_STATE); | |
596 | ||
597 | return rv; | |
598 | } | |
599 | ||
600 | static void print_st(struct drbd_conf *mdev, char *name, union drbd_state ns) | |
601 | { | |
602 | dev_err(DEV, " %s = { cs:%s ro:%s/%s ds:%s/%s %c%c%c%c }\n", | |
603 | name, | |
604 | drbd_conn_str(ns.conn), | |
605 | drbd_role_str(ns.role), | |
606 | drbd_role_str(ns.peer), | |
607 | drbd_disk_str(ns.disk), | |
608 | drbd_disk_str(ns.pdsk), | |
609 | ns.susp ? 's' : 'r', | |
610 | ns.aftr_isp ? 'a' : '-', | |
611 | ns.peer_isp ? 'p' : '-', | |
612 | ns.user_isp ? 'u' : '-' | |
613 | ); | |
614 | } | |
615 | ||
616 | void print_st_err(struct drbd_conf *mdev, | |
617 | union drbd_state os, union drbd_state ns, int err) | |
618 | { | |
619 | if (err == SS_IN_TRANSIENT_STATE) | |
620 | return; | |
621 | dev_err(DEV, "State change failed: %s\n", drbd_set_st_err_str(err)); | |
622 | print_st(mdev, " state", os); | |
623 | print_st(mdev, "wanted", ns); | |
624 | } | |
625 | ||
626 | ||
627 | #define drbd_peer_str drbd_role_str | |
628 | #define drbd_pdsk_str drbd_disk_str | |
629 | ||
630 | #define drbd_susp_str(A) ((A) ? "1" : "0") | |
631 | #define drbd_aftr_isp_str(A) ((A) ? "1" : "0") | |
632 | #define drbd_peer_isp_str(A) ((A) ? "1" : "0") | |
633 | #define drbd_user_isp_str(A) ((A) ? "1" : "0") | |
634 | ||
635 | #define PSC(A) \ | |
636 | ({ if (ns.A != os.A) { \ | |
637 | pbp += sprintf(pbp, #A "( %s -> %s ) ", \ | |
638 | drbd_##A##_str(os.A), \ | |
639 | drbd_##A##_str(ns.A)); \ | |
640 | } }) | |
641 | ||
642 | /** | |
643 | * is_valid_state() - Returns an SS_ error code if ns is not valid | |
644 | * @mdev: DRBD device. | |
645 | * @ns: State to consider. | |
646 | */ | |
647 | static int is_valid_state(struct drbd_conf *mdev, union drbd_state ns) | |
648 | { | |
649 | /* See drbd_state_sw_errors in drbd_strings.c */ | |
650 | ||
651 | enum drbd_fencing_p fp; | |
652 | int rv = SS_SUCCESS; | |
653 | ||
654 | fp = FP_DONT_CARE; | |
655 | if (get_ldev(mdev)) { | |
656 | fp = mdev->ldev->dc.fencing; | |
657 | put_ldev(mdev); | |
658 | } | |
659 | ||
660 | if (get_net_conf(mdev)) { | |
661 | if (!mdev->net_conf->two_primaries && | |
662 | ns.role == R_PRIMARY && ns.peer == R_PRIMARY) | |
663 | rv = SS_TWO_PRIMARIES; | |
664 | put_net_conf(mdev); | |
665 | } | |
666 | ||
667 | if (rv <= 0) | |
668 | /* already found a reason to abort */; | |
669 | else if (ns.role == R_SECONDARY && mdev->open_cnt) | |
670 | rv = SS_DEVICE_IN_USE; | |
671 | ||
672 | else if (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.disk < D_UP_TO_DATE) | |
673 | rv = SS_NO_UP_TO_DATE_DISK; | |
674 | ||
675 | else if (fp >= FP_RESOURCE && | |
676 | ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk >= D_UNKNOWN) | |
677 | rv = SS_PRIMARY_NOP; | |
678 | ||
679 | else if (ns.role == R_PRIMARY && ns.disk <= D_INCONSISTENT && ns.pdsk <= D_INCONSISTENT) | |
680 | rv = SS_NO_UP_TO_DATE_DISK; | |
681 | ||
682 | else if (ns.conn > C_CONNECTED && ns.disk < D_INCONSISTENT) | |
683 | rv = SS_NO_LOCAL_DISK; | |
684 | ||
685 | else if (ns.conn > C_CONNECTED && ns.pdsk < D_INCONSISTENT) | |
686 | rv = SS_NO_REMOTE_DISK; | |
687 | ||
688 | else if ((ns.conn == C_CONNECTED || | |
689 | ns.conn == C_WF_BITMAP_S || | |
690 | ns.conn == C_SYNC_SOURCE || | |
691 | ns.conn == C_PAUSED_SYNC_S) && | |
692 | ns.disk == D_OUTDATED) | |
693 | rv = SS_CONNECTED_OUTDATES; | |
694 | ||
695 | else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && | |
696 | (mdev->sync_conf.verify_alg[0] == 0)) | |
697 | rv = SS_NO_VERIFY_ALG; | |
698 | ||
699 | else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && | |
700 | mdev->agreed_pro_version < 88) | |
701 | rv = SS_NOT_SUPPORTED; | |
702 | ||
703 | return rv; | |
704 | } | |
705 | ||
706 | /** | |
707 | * is_valid_state_transition() - Returns an SS_ error code if the state transition is not possible | |
708 | * @mdev: DRBD device. | |
709 | * @ns: new state. | |
710 | * @os: old state. | |
711 | */ | |
712 | static int is_valid_state_transition(struct drbd_conf *mdev, | |
713 | union drbd_state ns, union drbd_state os) | |
714 | { | |
715 | int rv = SS_SUCCESS; | |
716 | ||
717 | if ((ns.conn == C_STARTING_SYNC_T || ns.conn == C_STARTING_SYNC_S) && | |
718 | os.conn > C_CONNECTED) | |
719 | rv = SS_RESYNC_RUNNING; | |
720 | ||
721 | if (ns.conn == C_DISCONNECTING && os.conn == C_STANDALONE) | |
722 | rv = SS_ALREADY_STANDALONE; | |
723 | ||
724 | if (ns.disk > D_ATTACHING && os.disk == D_DISKLESS) | |
725 | rv = SS_IS_DISKLESS; | |
726 | ||
727 | if (ns.conn == C_WF_CONNECTION && os.conn < C_UNCONNECTED) | |
728 | rv = SS_NO_NET_CONFIG; | |
729 | ||
730 | if (ns.disk == D_OUTDATED && os.disk < D_OUTDATED && os.disk != D_ATTACHING) | |
731 | rv = SS_LOWER_THAN_OUTDATED; | |
732 | ||
733 | if (ns.conn == C_DISCONNECTING && os.conn == C_UNCONNECTED) | |
734 | rv = SS_IN_TRANSIENT_STATE; | |
735 | ||
736 | if (ns.conn == os.conn && ns.conn == C_WF_REPORT_PARAMS) | |
737 | rv = SS_IN_TRANSIENT_STATE; | |
738 | ||
739 | if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && os.conn < C_CONNECTED) | |
740 | rv = SS_NEED_CONNECTION; | |
741 | ||
742 | if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && | |
743 | ns.conn != os.conn && os.conn > C_CONNECTED) | |
744 | rv = SS_RESYNC_RUNNING; | |
745 | ||
746 | if ((ns.conn == C_STARTING_SYNC_S || ns.conn == C_STARTING_SYNC_T) && | |
747 | os.conn < C_CONNECTED) | |
748 | rv = SS_NEED_CONNECTION; | |
749 | ||
750 | return rv; | |
751 | } | |
752 | ||
753 | /** | |
754 | * sanitize_state() - Resolves implicitly necessary additional changes to a state transition | |
755 | * @mdev: DRBD device. | |
756 | * @os: old state. | |
757 | * @ns: new state. | |
758 | * @warn_sync_abort: | |
759 | * | |
760 | * When we loose connection, we have to set the state of the peers disk (pdsk) | |
761 | * to D_UNKNOWN. This rule and many more along those lines are in this function. | |
762 | */ | |
763 | static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state os, | |
764 | union drbd_state ns, int *warn_sync_abort) | |
765 | { | |
766 | enum drbd_fencing_p fp; | |
767 | ||
768 | fp = FP_DONT_CARE; | |
769 | if (get_ldev(mdev)) { | |
770 | fp = mdev->ldev->dc.fencing; | |
771 | put_ldev(mdev); | |
772 | } | |
773 | ||
774 | /* Disallow Network errors to configure a device's network part */ | |
775 | if ((ns.conn >= C_TIMEOUT && ns.conn <= C_TEAR_DOWN) && | |
776 | os.conn <= C_DISCONNECTING) | |
777 | ns.conn = os.conn; | |
778 | ||
779 | /* After a network error (+C_TEAR_DOWN) only C_UNCONNECTED or C_DISCONNECTING can follow */ | |
780 | if (os.conn >= C_TIMEOUT && os.conn <= C_TEAR_DOWN && | |
781 | ns.conn != C_UNCONNECTED && ns.conn != C_DISCONNECTING) | |
782 | ns.conn = os.conn; | |
783 | ||
784 | /* After C_DISCONNECTING only C_STANDALONE may follow */ | |
785 | if (os.conn == C_DISCONNECTING && ns.conn != C_STANDALONE) | |
786 | ns.conn = os.conn; | |
787 | ||
788 | if (ns.conn < C_CONNECTED) { | |
789 | ns.peer_isp = 0; | |
790 | ns.peer = R_UNKNOWN; | |
791 | if (ns.pdsk > D_UNKNOWN || ns.pdsk < D_INCONSISTENT) | |
792 | ns.pdsk = D_UNKNOWN; | |
793 | } | |
794 | ||
795 | /* Clear the aftr_isp when becoming unconfigured */ | |
796 | if (ns.conn == C_STANDALONE && ns.disk == D_DISKLESS && ns.role == R_SECONDARY) | |
797 | ns.aftr_isp = 0; | |
798 | ||
799 | if (ns.conn <= C_DISCONNECTING && ns.disk == D_DISKLESS) | |
800 | ns.pdsk = D_UNKNOWN; | |
801 | ||
802 | /* Abort resync if a disk fails/detaches */ | |
803 | if (os.conn > C_CONNECTED && ns.conn > C_CONNECTED && | |
804 | (ns.disk <= D_FAILED || ns.pdsk <= D_FAILED)) { | |
805 | if (warn_sync_abort) | |
806 | *warn_sync_abort = 1; | |
807 | ns.conn = C_CONNECTED; | |
808 | } | |
809 | ||
810 | if (ns.conn >= C_CONNECTED && | |
811 | ((ns.disk == D_CONSISTENT || ns.disk == D_OUTDATED) || | |
812 | (ns.disk == D_NEGOTIATING && ns.conn == C_WF_BITMAP_T))) { | |
813 | switch (ns.conn) { | |
814 | case C_WF_BITMAP_T: | |
815 | case C_PAUSED_SYNC_T: | |
816 | ns.disk = D_OUTDATED; | |
817 | break; | |
818 | case C_CONNECTED: | |
819 | case C_WF_BITMAP_S: | |
820 | case C_SYNC_SOURCE: | |
821 | case C_PAUSED_SYNC_S: | |
822 | ns.disk = D_UP_TO_DATE; | |
823 | break; | |
824 | case C_SYNC_TARGET: | |
825 | ns.disk = D_INCONSISTENT; | |
826 | dev_warn(DEV, "Implicitly set disk state Inconsistent!\n"); | |
827 | break; | |
828 | } | |
829 | if (os.disk == D_OUTDATED && ns.disk == D_UP_TO_DATE) | |
830 | dev_warn(DEV, "Implicitly set disk from Outdated to UpToDate\n"); | |
831 | } | |
832 | ||
833 | if (ns.conn >= C_CONNECTED && | |
834 | (ns.pdsk == D_CONSISTENT || ns.pdsk == D_OUTDATED)) { | |
835 | switch (ns.conn) { | |
836 | case C_CONNECTED: | |
837 | case C_WF_BITMAP_T: | |
838 | case C_PAUSED_SYNC_T: | |
839 | case C_SYNC_TARGET: | |
840 | ns.pdsk = D_UP_TO_DATE; | |
841 | break; | |
842 | case C_WF_BITMAP_S: | |
843 | case C_PAUSED_SYNC_S: | |
844 | ns.pdsk = D_OUTDATED; | |
845 | break; | |
846 | case C_SYNC_SOURCE: | |
847 | ns.pdsk = D_INCONSISTENT; | |
848 | dev_warn(DEV, "Implicitly set pdsk Inconsistent!\n"); | |
849 | break; | |
850 | } | |
851 | if (os.pdsk == D_OUTDATED && ns.pdsk == D_UP_TO_DATE) | |
852 | dev_warn(DEV, "Implicitly set pdsk from Outdated to UpToDate\n"); | |
853 | } | |
854 | ||
855 | /* Connection breaks down before we finished "Negotiating" */ | |
856 | if (ns.conn < C_CONNECTED && ns.disk == D_NEGOTIATING && | |
857 | get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
858 | if (mdev->ed_uuid == mdev->ldev->md.uuid[UI_CURRENT]) { | |
859 | ns.disk = mdev->new_state_tmp.disk; | |
860 | ns.pdsk = mdev->new_state_tmp.pdsk; | |
861 | } else { | |
862 | dev_alert(DEV, "Connection lost while negotiating, no data!\n"); | |
863 | ns.disk = D_DISKLESS; | |
864 | ns.pdsk = D_UNKNOWN; | |
865 | } | |
866 | put_ldev(mdev); | |
867 | } | |
868 | ||
869 | if (fp == FP_STONITH && | |
0a492166 PR |
870 | (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk > D_OUTDATED) && |
871 | !(os.role == R_PRIMARY && os.conn < C_CONNECTED && os.pdsk > D_OUTDATED)) | |
872 | ns.susp = 1; | |
b411b363 PR |
873 | |
874 | if (ns.aftr_isp || ns.peer_isp || ns.user_isp) { | |
875 | if (ns.conn == C_SYNC_SOURCE) | |
876 | ns.conn = C_PAUSED_SYNC_S; | |
877 | if (ns.conn == C_SYNC_TARGET) | |
878 | ns.conn = C_PAUSED_SYNC_T; | |
879 | } else { | |
880 | if (ns.conn == C_PAUSED_SYNC_S) | |
881 | ns.conn = C_SYNC_SOURCE; | |
882 | if (ns.conn == C_PAUSED_SYNC_T) | |
883 | ns.conn = C_SYNC_TARGET; | |
884 | } | |
885 | ||
886 | return ns; | |
887 | } | |
888 | ||
889 | /* helper for __drbd_set_state */ | |
890 | static void set_ov_position(struct drbd_conf *mdev, enum drbd_conns cs) | |
891 | { | |
892 | if (cs == C_VERIFY_T) { | |
893 | /* starting online verify from an arbitrary position | |
894 | * does not fit well into the existing protocol. | |
895 | * on C_VERIFY_T, we initialize ov_left and friends | |
896 | * implicitly in receive_DataRequest once the | |
897 | * first P_OV_REQUEST is received */ | |
898 | mdev->ov_start_sector = ~(sector_t)0; | |
899 | } else { | |
900 | unsigned long bit = BM_SECT_TO_BIT(mdev->ov_start_sector); | |
901 | if (bit >= mdev->rs_total) | |
902 | mdev->ov_start_sector = | |
903 | BM_BIT_TO_SECT(mdev->rs_total - 1); | |
904 | mdev->ov_position = mdev->ov_start_sector; | |
905 | } | |
906 | } | |
907 | ||
908 | /** | |
909 | * __drbd_set_state() - Set a new DRBD state | |
910 | * @mdev: DRBD device. | |
911 | * @ns: new state. | |
912 | * @flags: Flags | |
913 | * @done: Optional completion, that will get completed after the after_state_ch() finished | |
914 | * | |
915 | * Caller needs to hold req_lock, and global_state_lock. Do not call directly. | |
916 | */ | |
917 | int __drbd_set_state(struct drbd_conf *mdev, | |
918 | union drbd_state ns, enum chg_state_flags flags, | |
919 | struct completion *done) | |
920 | { | |
921 | union drbd_state os; | |
922 | int rv = SS_SUCCESS; | |
923 | int warn_sync_abort = 0; | |
924 | struct after_state_chg_work *ascw; | |
925 | ||
926 | os = mdev->state; | |
927 | ||
928 | ns = sanitize_state(mdev, os, ns, &warn_sync_abort); | |
929 | ||
930 | if (ns.i == os.i) | |
931 | return SS_NOTHING_TO_DO; | |
932 | ||
933 | if (!(flags & CS_HARD)) { | |
934 | /* pre-state-change checks ; only look at ns */ | |
935 | /* See drbd_state_sw_errors in drbd_strings.c */ | |
936 | ||
937 | rv = is_valid_state(mdev, ns); | |
938 | if (rv < SS_SUCCESS) { | |
939 | /* If the old state was illegal as well, then let | |
940 | this happen...*/ | |
941 | ||
942 | if (is_valid_state(mdev, os) == rv) { | |
943 | dev_err(DEV, "Considering state change from bad state. " | |
944 | "Error would be: '%s'\n", | |
945 | drbd_set_st_err_str(rv)); | |
946 | print_st(mdev, "old", os); | |
947 | print_st(mdev, "new", ns); | |
948 | rv = is_valid_state_transition(mdev, ns, os); | |
949 | } | |
950 | } else | |
951 | rv = is_valid_state_transition(mdev, ns, os); | |
952 | } | |
953 | ||
954 | if (rv < SS_SUCCESS) { | |
955 | if (flags & CS_VERBOSE) | |
956 | print_st_err(mdev, os, ns, rv); | |
957 | return rv; | |
958 | } | |
959 | ||
960 | if (warn_sync_abort) | |
961 | dev_warn(DEV, "Resync aborted.\n"); | |
962 | ||
963 | { | |
964 | char *pbp, pb[300]; | |
965 | pbp = pb; | |
966 | *pbp = 0; | |
967 | PSC(role); | |
968 | PSC(peer); | |
969 | PSC(conn); | |
970 | PSC(disk); | |
971 | PSC(pdsk); | |
972 | PSC(susp); | |
973 | PSC(aftr_isp); | |
974 | PSC(peer_isp); | |
975 | PSC(user_isp); | |
976 | dev_info(DEV, "%s\n", pb); | |
977 | } | |
978 | ||
979 | /* solve the race between becoming unconfigured, | |
980 | * worker doing the cleanup, and | |
981 | * admin reconfiguring us: | |
982 | * on (re)configure, first set CONFIG_PENDING, | |
983 | * then wait for a potentially exiting worker, | |
984 | * start the worker, and schedule one no_op. | |
985 | * then proceed with configuration. | |
986 | */ | |
987 | if (ns.disk == D_DISKLESS && | |
988 | ns.conn == C_STANDALONE && | |
989 | ns.role == R_SECONDARY && | |
990 | !test_and_set_bit(CONFIG_PENDING, &mdev->flags)) | |
991 | set_bit(DEVICE_DYING, &mdev->flags); | |
992 | ||
993 | mdev->state.i = ns.i; | |
994 | wake_up(&mdev->misc_wait); | |
995 | wake_up(&mdev->state_wait); | |
996 | ||
997 | /* post-state-change actions */ | |
998 | if (os.conn >= C_SYNC_SOURCE && ns.conn <= C_CONNECTED) { | |
999 | set_bit(STOP_SYNC_TIMER, &mdev->flags); | |
1000 | mod_timer(&mdev->resync_timer, jiffies); | |
1001 | } | |
1002 | ||
1003 | /* aborted verify run. log the last position */ | |
1004 | if ((os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) && | |
1005 | ns.conn < C_CONNECTED) { | |
1006 | mdev->ov_start_sector = | |
1007 | BM_BIT_TO_SECT(mdev->rs_total - mdev->ov_left); | |
1008 | dev_info(DEV, "Online Verify reached sector %llu\n", | |
1009 | (unsigned long long)mdev->ov_start_sector); | |
1010 | } | |
1011 | ||
1012 | if ((os.conn == C_PAUSED_SYNC_T || os.conn == C_PAUSED_SYNC_S) && | |
1013 | (ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)) { | |
1014 | dev_info(DEV, "Syncer continues.\n"); | |
1015 | mdev->rs_paused += (long)jiffies-(long)mdev->rs_mark_time; | |
1016 | if (ns.conn == C_SYNC_TARGET) { | |
1017 | if (!test_and_clear_bit(STOP_SYNC_TIMER, &mdev->flags)) | |
1018 | mod_timer(&mdev->resync_timer, jiffies); | |
1019 | /* This if (!test_bit) is only needed for the case | |
1020 | that a device that has ceased to used its timer, | |
1021 | i.e. it is already in drbd_resync_finished() gets | |
1022 | paused and resumed. */ | |
1023 | } | |
1024 | } | |
1025 | ||
1026 | if ((os.conn == C_SYNC_TARGET || os.conn == C_SYNC_SOURCE) && | |
1027 | (ns.conn == C_PAUSED_SYNC_T || ns.conn == C_PAUSED_SYNC_S)) { | |
1028 | dev_info(DEV, "Resync suspended\n"); | |
1029 | mdev->rs_mark_time = jiffies; | |
1030 | if (ns.conn == C_PAUSED_SYNC_T) | |
1031 | set_bit(STOP_SYNC_TIMER, &mdev->flags); | |
1032 | } | |
1033 | ||
1034 | if (os.conn == C_CONNECTED && | |
1035 | (ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T)) { | |
1036 | mdev->ov_position = 0; | |
1037 | mdev->rs_total = | |
1038 | mdev->rs_mark_left = drbd_bm_bits(mdev); | |
1039 | if (mdev->agreed_pro_version >= 90) | |
1040 | set_ov_position(mdev, ns.conn); | |
1041 | else | |
1042 | mdev->ov_start_sector = 0; | |
1043 | mdev->ov_left = mdev->rs_total | |
1044 | - BM_SECT_TO_BIT(mdev->ov_position); | |
1045 | mdev->rs_start = | |
1046 | mdev->rs_mark_time = jiffies; | |
1047 | mdev->ov_last_oos_size = 0; | |
1048 | mdev->ov_last_oos_start = 0; | |
1049 | ||
1050 | if (ns.conn == C_VERIFY_S) { | |
1051 | dev_info(DEV, "Starting Online Verify from sector %llu\n", | |
1052 | (unsigned long long)mdev->ov_position); | |
1053 | mod_timer(&mdev->resync_timer, jiffies); | |
1054 | } | |
1055 | } | |
1056 | ||
1057 | if (get_ldev(mdev)) { | |
1058 | u32 mdf = mdev->ldev->md.flags & ~(MDF_CONSISTENT|MDF_PRIMARY_IND| | |
1059 | MDF_CONNECTED_IND|MDF_WAS_UP_TO_DATE| | |
1060 | MDF_PEER_OUT_DATED|MDF_CRASHED_PRIMARY); | |
1061 | ||
1062 | if (test_bit(CRASHED_PRIMARY, &mdev->flags)) | |
1063 | mdf |= MDF_CRASHED_PRIMARY; | |
1064 | if (mdev->state.role == R_PRIMARY || | |
1065 | (mdev->state.pdsk < D_INCONSISTENT && mdev->state.peer == R_PRIMARY)) | |
1066 | mdf |= MDF_PRIMARY_IND; | |
1067 | if (mdev->state.conn > C_WF_REPORT_PARAMS) | |
1068 | mdf |= MDF_CONNECTED_IND; | |
1069 | if (mdev->state.disk > D_INCONSISTENT) | |
1070 | mdf |= MDF_CONSISTENT; | |
1071 | if (mdev->state.disk > D_OUTDATED) | |
1072 | mdf |= MDF_WAS_UP_TO_DATE; | |
1073 | if (mdev->state.pdsk <= D_OUTDATED && mdev->state.pdsk >= D_INCONSISTENT) | |
1074 | mdf |= MDF_PEER_OUT_DATED; | |
1075 | if (mdf != mdev->ldev->md.flags) { | |
1076 | mdev->ldev->md.flags = mdf; | |
1077 | drbd_md_mark_dirty(mdev); | |
1078 | } | |
1079 | if (os.disk < D_CONSISTENT && ns.disk >= D_CONSISTENT) | |
1080 | drbd_set_ed_uuid(mdev, mdev->ldev->md.uuid[UI_CURRENT]); | |
1081 | put_ldev(mdev); | |
1082 | } | |
1083 | ||
1084 | /* Peer was forced D_UP_TO_DATE & R_PRIMARY, consider to resync */ | |
1085 | if (os.disk == D_INCONSISTENT && os.pdsk == D_INCONSISTENT && | |
1086 | os.peer == R_SECONDARY && ns.peer == R_PRIMARY) | |
1087 | set_bit(CONSIDER_RESYNC, &mdev->flags); | |
1088 | ||
1089 | /* Receiver should clean up itself */ | |
1090 | if (os.conn != C_DISCONNECTING && ns.conn == C_DISCONNECTING) | |
1091 | drbd_thread_stop_nowait(&mdev->receiver); | |
1092 | ||
1093 | /* Now the receiver finished cleaning up itself, it should die */ | |
1094 | if (os.conn != C_STANDALONE && ns.conn == C_STANDALONE) | |
1095 | drbd_thread_stop_nowait(&mdev->receiver); | |
1096 | ||
1097 | /* Upon network failure, we need to restart the receiver. */ | |
1098 | if (os.conn > C_TEAR_DOWN && | |
1099 | ns.conn <= C_TEAR_DOWN && ns.conn >= C_TIMEOUT) | |
1100 | drbd_thread_restart_nowait(&mdev->receiver); | |
1101 | ||
1102 | ascw = kmalloc(sizeof(*ascw), GFP_ATOMIC); | |
1103 | if (ascw) { | |
1104 | ascw->os = os; | |
1105 | ascw->ns = ns; | |
1106 | ascw->flags = flags; | |
1107 | ascw->w.cb = w_after_state_ch; | |
1108 | ascw->done = done; | |
1109 | drbd_queue_work(&mdev->data.work, &ascw->w); | |
1110 | } else { | |
1111 | dev_warn(DEV, "Could not kmalloc an ascw\n"); | |
1112 | } | |
1113 | ||
1114 | return rv; | |
1115 | } | |
1116 | ||
1117 | static int w_after_state_ch(struct drbd_conf *mdev, struct drbd_work *w, int unused) | |
1118 | { | |
1119 | struct after_state_chg_work *ascw = | |
1120 | container_of(w, struct after_state_chg_work, w); | |
1121 | after_state_ch(mdev, ascw->os, ascw->ns, ascw->flags); | |
1122 | if (ascw->flags & CS_WAIT_COMPLETE) { | |
1123 | D_ASSERT(ascw->done != NULL); | |
1124 | complete(ascw->done); | |
1125 | } | |
1126 | kfree(ascw); | |
1127 | ||
1128 | return 1; | |
1129 | } | |
1130 | ||
1131 | static void abw_start_sync(struct drbd_conf *mdev, int rv) | |
1132 | { | |
1133 | if (rv) { | |
1134 | dev_err(DEV, "Writing the bitmap failed not starting resync.\n"); | |
1135 | _drbd_request_state(mdev, NS(conn, C_CONNECTED), CS_VERBOSE); | |
1136 | return; | |
1137 | } | |
1138 | ||
1139 | switch (mdev->state.conn) { | |
1140 | case C_STARTING_SYNC_T: | |
1141 | _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); | |
1142 | break; | |
1143 | case C_STARTING_SYNC_S: | |
1144 | drbd_start_resync(mdev, C_SYNC_SOURCE); | |
1145 | break; | |
1146 | } | |
1147 | } | |
1148 | ||
1149 | /** | |
1150 | * after_state_ch() - Perform after state change actions that may sleep | |
1151 | * @mdev: DRBD device. | |
1152 | * @os: old state. | |
1153 | * @ns: new state. | |
1154 | * @flags: Flags | |
1155 | */ | |
1156 | static void after_state_ch(struct drbd_conf *mdev, union drbd_state os, | |
1157 | union drbd_state ns, enum chg_state_flags flags) | |
1158 | { | |
1159 | enum drbd_fencing_p fp; | |
1160 | ||
1161 | if (os.conn != C_CONNECTED && ns.conn == C_CONNECTED) { | |
1162 | clear_bit(CRASHED_PRIMARY, &mdev->flags); | |
1163 | if (mdev->p_uuid) | |
1164 | mdev->p_uuid[UI_FLAGS] &= ~((u64)2); | |
1165 | } | |
1166 | ||
1167 | fp = FP_DONT_CARE; | |
1168 | if (get_ldev(mdev)) { | |
1169 | fp = mdev->ldev->dc.fencing; | |
1170 | put_ldev(mdev); | |
1171 | } | |
1172 | ||
1173 | /* Inform userspace about the change... */ | |
1174 | drbd_bcast_state(mdev, ns); | |
1175 | ||
1176 | if (!(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE) && | |
1177 | (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE)) | |
1178 | drbd_khelper(mdev, "pri-on-incon-degr"); | |
1179 | ||
1180 | /* Here we have the actions that are performed after a | |
1181 | state change. This function might sleep */ | |
1182 | ||
1183 | if (fp == FP_STONITH && ns.susp) { | |
1184 | /* case1: The outdate peer handler is successful: | |
1185 | * case2: The connection was established again: */ | |
1186 | if ((os.pdsk > D_OUTDATED && ns.pdsk <= D_OUTDATED) || | |
1187 | (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED)) { | |
1188 | tl_clear(mdev); | |
1189 | spin_lock_irq(&mdev->req_lock); | |
1190 | _drbd_set_state(_NS(mdev, susp, 0), CS_VERBOSE, NULL); | |
1191 | spin_unlock_irq(&mdev->req_lock); | |
1192 | } | |
1193 | } | |
1194 | /* Do not change the order of the if above and the two below... */ | |
1195 | if (os.pdsk == D_DISKLESS && ns.pdsk > D_DISKLESS) { /* attach on the peer */ | |
1196 | drbd_send_uuids(mdev); | |
1197 | drbd_send_state(mdev); | |
1198 | } | |
1199 | if (os.conn != C_WF_BITMAP_S && ns.conn == C_WF_BITMAP_S) | |
1200 | drbd_queue_bitmap_io(mdev, &drbd_send_bitmap, NULL, "send_bitmap (WFBitMapS)"); | |
1201 | ||
1202 | /* Lost contact to peer's copy of the data */ | |
1203 | if ((os.pdsk >= D_INCONSISTENT && | |
1204 | os.pdsk != D_UNKNOWN && | |
1205 | os.pdsk != D_OUTDATED) | |
1206 | && (ns.pdsk < D_INCONSISTENT || | |
1207 | ns.pdsk == D_UNKNOWN || | |
1208 | ns.pdsk == D_OUTDATED)) { | |
1209 | kfree(mdev->p_uuid); | |
1210 | mdev->p_uuid = NULL; | |
1211 | if (get_ldev(mdev)) { | |
1212 | if ((ns.role == R_PRIMARY || ns.peer == R_PRIMARY) && | |
1213 | mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) { | |
1214 | drbd_uuid_new_current(mdev); | |
1215 | drbd_send_uuids(mdev); | |
1216 | } | |
1217 | put_ldev(mdev); | |
1218 | } | |
1219 | } | |
1220 | ||
1221 | if (ns.pdsk < D_INCONSISTENT && get_ldev(mdev)) { | |
1222 | if (ns.peer == R_PRIMARY && mdev->ldev->md.uuid[UI_BITMAP] == 0) | |
1223 | drbd_uuid_new_current(mdev); | |
1224 | ||
1225 | /* D_DISKLESS Peer becomes secondary */ | |
1226 | if (os.peer == R_PRIMARY && ns.peer == R_SECONDARY) | |
1227 | drbd_al_to_on_disk_bm(mdev); | |
1228 | put_ldev(mdev); | |
1229 | } | |
1230 | ||
1231 | /* Last part of the attaching process ... */ | |
1232 | if (ns.conn >= C_CONNECTED && | |
1233 | os.disk == D_ATTACHING && ns.disk == D_NEGOTIATING) { | |
1234 | kfree(mdev->p_uuid); /* We expect to receive up-to-date UUIDs soon. */ | |
1235 | mdev->p_uuid = NULL; /* ...to not use the old ones in the mean time */ | |
1236 | drbd_send_sizes(mdev, 0); /* to start sync... */ | |
1237 | drbd_send_uuids(mdev); | |
1238 | drbd_send_state(mdev); | |
1239 | } | |
1240 | ||
1241 | /* We want to pause/continue resync, tell peer. */ | |
1242 | if (ns.conn >= C_CONNECTED && | |
1243 | ((os.aftr_isp != ns.aftr_isp) || | |
1244 | (os.user_isp != ns.user_isp))) | |
1245 | drbd_send_state(mdev); | |
1246 | ||
1247 | /* In case one of the isp bits got set, suspend other devices. */ | |
1248 | if ((!os.aftr_isp && !os.peer_isp && !os.user_isp) && | |
1249 | (ns.aftr_isp || ns.peer_isp || ns.user_isp)) | |
1250 | suspend_other_sg(mdev); | |
1251 | ||
1252 | /* Make sure the peer gets informed about eventual state | |
1253 | changes (ISP bits) while we were in WFReportParams. */ | |
1254 | if (os.conn == C_WF_REPORT_PARAMS && ns.conn >= C_CONNECTED) | |
1255 | drbd_send_state(mdev); | |
1256 | ||
1257 | /* We are in the progress to start a full sync... */ | |
1258 | if ((os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) || | |
1259 | (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S)) | |
1260 | drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, &abw_start_sync, "set_n_write from StartingSync"); | |
1261 | ||
1262 | /* We are invalidating our self... */ | |
1263 | if (os.conn < C_CONNECTED && ns.conn < C_CONNECTED && | |
1264 | os.disk > D_INCONSISTENT && ns.disk == D_INCONSISTENT) | |
1265 | drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, NULL, "set_n_write from invalidate"); | |
1266 | ||
1267 | if (os.disk > D_FAILED && ns.disk == D_FAILED) { | |
1268 | enum drbd_io_error_p eh; | |
1269 | ||
1270 | eh = EP_PASS_ON; | |
1271 | if (get_ldev_if_state(mdev, D_FAILED)) { | |
1272 | eh = mdev->ldev->dc.on_io_error; | |
1273 | put_ldev(mdev); | |
1274 | } | |
1275 | ||
1276 | drbd_rs_cancel_all(mdev); | |
1277 | /* since get_ldev() only works as long as disk>=D_INCONSISTENT, | |
1278 | and it is D_DISKLESS here, local_cnt can only go down, it can | |
1279 | not increase... It will reach zero */ | |
1280 | wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt)); | |
1281 | mdev->rs_total = 0; | |
1282 | mdev->rs_failed = 0; | |
1283 | atomic_set(&mdev->rs_pending_cnt, 0); | |
1284 | ||
1285 | spin_lock_irq(&mdev->req_lock); | |
1286 | _drbd_set_state(_NS(mdev, disk, D_DISKLESS), CS_HARD, NULL); | |
1287 | spin_unlock_irq(&mdev->req_lock); | |
1288 | ||
1289 | if (eh == EP_CALL_HELPER) | |
1290 | drbd_khelper(mdev, "local-io-error"); | |
1291 | } | |
1292 | ||
1293 | if (os.disk > D_DISKLESS && ns.disk == D_DISKLESS) { | |
1294 | ||
1295 | if (os.disk == D_FAILED) /* && ns.disk == D_DISKLESS*/ { | |
1296 | if (drbd_send_state(mdev)) | |
1297 | dev_warn(DEV, "Notified peer that my disk is broken.\n"); | |
1298 | else | |
1299 | dev_err(DEV, "Sending state in drbd_io_error() failed\n"); | |
1300 | } | |
1301 | ||
1302 | lc_destroy(mdev->resync); | |
1303 | mdev->resync = NULL; | |
1304 | lc_destroy(mdev->act_log); | |
1305 | mdev->act_log = NULL; | |
1306 | __no_warn(local, | |
1307 | drbd_free_bc(mdev->ldev); | |
1308 | mdev->ldev = NULL;); | |
1309 | ||
1310 | if (mdev->md_io_tmpp) | |
1311 | __free_page(mdev->md_io_tmpp); | |
1312 | } | |
1313 | ||
1314 | /* Disks got bigger while they were detached */ | |
1315 | if (ns.disk > D_NEGOTIATING && ns.pdsk > D_NEGOTIATING && | |
1316 | test_and_clear_bit(RESYNC_AFTER_NEG, &mdev->flags)) { | |
1317 | if (ns.conn == C_CONNECTED) | |
1318 | resync_after_online_grow(mdev); | |
1319 | } | |
1320 | ||
1321 | /* A resync finished or aborted, wake paused devices... */ | |
1322 | if ((os.conn > C_CONNECTED && ns.conn <= C_CONNECTED) || | |
1323 | (os.peer_isp && !ns.peer_isp) || | |
1324 | (os.user_isp && !ns.user_isp)) | |
1325 | resume_next_sg(mdev); | |
1326 | ||
1327 | /* Upon network connection, we need to start the receiver */ | |
1328 | if (os.conn == C_STANDALONE && ns.conn == C_UNCONNECTED) | |
1329 | drbd_thread_start(&mdev->receiver); | |
1330 | ||
1331 | /* Terminate worker thread if we are unconfigured - it will be | |
1332 | restarted as needed... */ | |
1333 | if (ns.disk == D_DISKLESS && | |
1334 | ns.conn == C_STANDALONE && | |
1335 | ns.role == R_SECONDARY) { | |
1336 | if (os.aftr_isp != ns.aftr_isp) | |
1337 | resume_next_sg(mdev); | |
1338 | /* set in __drbd_set_state, unless CONFIG_PENDING was set */ | |
1339 | if (test_bit(DEVICE_DYING, &mdev->flags)) | |
1340 | drbd_thread_stop_nowait(&mdev->worker); | |
1341 | } | |
1342 | ||
1343 | drbd_md_sync(mdev); | |
1344 | } | |
1345 | ||
1346 | ||
1347 | static int drbd_thread_setup(void *arg) | |
1348 | { | |
1349 | struct drbd_thread *thi = (struct drbd_thread *) arg; | |
1350 | struct drbd_conf *mdev = thi->mdev; | |
1351 | unsigned long flags; | |
1352 | int retval; | |
1353 | ||
1354 | restart: | |
1355 | retval = thi->function(thi); | |
1356 | ||
1357 | spin_lock_irqsave(&thi->t_lock, flags); | |
1358 | ||
1359 | /* if the receiver has been "Exiting", the last thing it did | |
1360 | * was set the conn state to "StandAlone", | |
1361 | * if now a re-connect request comes in, conn state goes C_UNCONNECTED, | |
1362 | * and receiver thread will be "started". | |
1363 | * drbd_thread_start needs to set "Restarting" in that case. | |
1364 | * t_state check and assignment needs to be within the same spinlock, | |
1365 | * so either thread_start sees Exiting, and can remap to Restarting, | |
1366 | * or thread_start see None, and can proceed as normal. | |
1367 | */ | |
1368 | ||
1369 | if (thi->t_state == Restarting) { | |
1370 | dev_info(DEV, "Restarting %s\n", current->comm); | |
1371 | thi->t_state = Running; | |
1372 | spin_unlock_irqrestore(&thi->t_lock, flags); | |
1373 | goto restart; | |
1374 | } | |
1375 | ||
1376 | thi->task = NULL; | |
1377 | thi->t_state = None; | |
1378 | smp_mb(); | |
1379 | complete(&thi->stop); | |
1380 | spin_unlock_irqrestore(&thi->t_lock, flags); | |
1381 | ||
1382 | dev_info(DEV, "Terminating %s\n", current->comm); | |
1383 | ||
1384 | /* Release mod reference taken when thread was started */ | |
1385 | module_put(THIS_MODULE); | |
1386 | return retval; | |
1387 | } | |
1388 | ||
1389 | static void drbd_thread_init(struct drbd_conf *mdev, struct drbd_thread *thi, | |
1390 | int (*func) (struct drbd_thread *)) | |
1391 | { | |
1392 | spin_lock_init(&thi->t_lock); | |
1393 | thi->task = NULL; | |
1394 | thi->t_state = None; | |
1395 | thi->function = func; | |
1396 | thi->mdev = mdev; | |
1397 | } | |
1398 | ||
1399 | int drbd_thread_start(struct drbd_thread *thi) | |
1400 | { | |
1401 | struct drbd_conf *mdev = thi->mdev; | |
1402 | struct task_struct *nt; | |
1403 | unsigned long flags; | |
1404 | ||
1405 | const char *me = | |
1406 | thi == &mdev->receiver ? "receiver" : | |
1407 | thi == &mdev->asender ? "asender" : | |
1408 | thi == &mdev->worker ? "worker" : "NONSENSE"; | |
1409 | ||
1410 | /* is used from state engine doing drbd_thread_stop_nowait, | |
1411 | * while holding the req lock irqsave */ | |
1412 | spin_lock_irqsave(&thi->t_lock, flags); | |
1413 | ||
1414 | switch (thi->t_state) { | |
1415 | case None: | |
1416 | dev_info(DEV, "Starting %s thread (from %s [%d])\n", | |
1417 | me, current->comm, current->pid); | |
1418 | ||
1419 | /* Get ref on module for thread - this is released when thread exits */ | |
1420 | if (!try_module_get(THIS_MODULE)) { | |
1421 | dev_err(DEV, "Failed to get module reference in drbd_thread_start\n"); | |
1422 | spin_unlock_irqrestore(&thi->t_lock, flags); | |
1423 | return FALSE; | |
1424 | } | |
1425 | ||
1426 | init_completion(&thi->stop); | |
1427 | D_ASSERT(thi->task == NULL); | |
1428 | thi->reset_cpu_mask = 1; | |
1429 | thi->t_state = Running; | |
1430 | spin_unlock_irqrestore(&thi->t_lock, flags); | |
1431 | flush_signals(current); /* otherw. may get -ERESTARTNOINTR */ | |
1432 | ||
1433 | nt = kthread_create(drbd_thread_setup, (void *) thi, | |
1434 | "drbd%d_%s", mdev_to_minor(mdev), me); | |
1435 | ||
1436 | if (IS_ERR(nt)) { | |
1437 | dev_err(DEV, "Couldn't start thread\n"); | |
1438 | ||
1439 | module_put(THIS_MODULE); | |
1440 | return FALSE; | |
1441 | } | |
1442 | spin_lock_irqsave(&thi->t_lock, flags); | |
1443 | thi->task = nt; | |
1444 | thi->t_state = Running; | |
1445 | spin_unlock_irqrestore(&thi->t_lock, flags); | |
1446 | wake_up_process(nt); | |
1447 | break; | |
1448 | case Exiting: | |
1449 | thi->t_state = Restarting; | |
1450 | dev_info(DEV, "Restarting %s thread (from %s [%d])\n", | |
1451 | me, current->comm, current->pid); | |
1452 | /* fall through */ | |
1453 | case Running: | |
1454 | case Restarting: | |
1455 | default: | |
1456 | spin_unlock_irqrestore(&thi->t_lock, flags); | |
1457 | break; | |
1458 | } | |
1459 | ||
1460 | return TRUE; | |
1461 | } | |
1462 | ||
1463 | ||
1464 | void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait) | |
1465 | { | |
1466 | unsigned long flags; | |
1467 | ||
1468 | enum drbd_thread_state ns = restart ? Restarting : Exiting; | |
1469 | ||
1470 | /* may be called from state engine, holding the req lock irqsave */ | |
1471 | spin_lock_irqsave(&thi->t_lock, flags); | |
1472 | ||
1473 | if (thi->t_state == None) { | |
1474 | spin_unlock_irqrestore(&thi->t_lock, flags); | |
1475 | if (restart) | |
1476 | drbd_thread_start(thi); | |
1477 | return; | |
1478 | } | |
1479 | ||
1480 | if (thi->t_state != ns) { | |
1481 | if (thi->task == NULL) { | |
1482 | spin_unlock_irqrestore(&thi->t_lock, flags); | |
1483 | return; | |
1484 | } | |
1485 | ||
1486 | thi->t_state = ns; | |
1487 | smp_mb(); | |
1488 | init_completion(&thi->stop); | |
1489 | if (thi->task != current) | |
1490 | force_sig(DRBD_SIGKILL, thi->task); | |
1491 | ||
1492 | } | |
1493 | ||
1494 | spin_unlock_irqrestore(&thi->t_lock, flags); | |
1495 | ||
1496 | if (wait) | |
1497 | wait_for_completion(&thi->stop); | |
1498 | } | |
1499 | ||
1500 | #ifdef CONFIG_SMP | |
1501 | /** | |
1502 | * drbd_calc_cpu_mask() - Generate CPU masks, spread over all CPUs | |
1503 | * @mdev: DRBD device. | |
1504 | * | |
1505 | * Forces all threads of a device onto the same CPU. This is beneficial for | |
1506 | * DRBD's performance. May be overwritten by user's configuration. | |
1507 | */ | |
1508 | void drbd_calc_cpu_mask(struct drbd_conf *mdev) | |
1509 | { | |
1510 | int ord, cpu; | |
1511 | ||
1512 | /* user override. */ | |
1513 | if (cpumask_weight(mdev->cpu_mask)) | |
1514 | return; | |
1515 | ||
1516 | ord = mdev_to_minor(mdev) % cpumask_weight(cpu_online_mask); | |
1517 | for_each_online_cpu(cpu) { | |
1518 | if (ord-- == 0) { | |
1519 | cpumask_set_cpu(cpu, mdev->cpu_mask); | |
1520 | return; | |
1521 | } | |
1522 | } | |
1523 | /* should not be reached */ | |
1524 | cpumask_setall(mdev->cpu_mask); | |
1525 | } | |
1526 | ||
1527 | /** | |
1528 | * drbd_thread_current_set_cpu() - modifies the cpu mask of the _current_ thread | |
1529 | * @mdev: DRBD device. | |
1530 | * | |
1531 | * call in the "main loop" of _all_ threads, no need for any mutex, current won't die | |
1532 | * prematurely. | |
1533 | */ | |
1534 | void drbd_thread_current_set_cpu(struct drbd_conf *mdev) | |
1535 | { | |
1536 | struct task_struct *p = current; | |
1537 | struct drbd_thread *thi = | |
1538 | p == mdev->asender.task ? &mdev->asender : | |
1539 | p == mdev->receiver.task ? &mdev->receiver : | |
1540 | p == mdev->worker.task ? &mdev->worker : | |
1541 | NULL; | |
1542 | ERR_IF(thi == NULL) | |
1543 | return; | |
1544 | if (!thi->reset_cpu_mask) | |
1545 | return; | |
1546 | thi->reset_cpu_mask = 0; | |
1547 | set_cpus_allowed_ptr(p, mdev->cpu_mask); | |
1548 | } | |
1549 | #endif | |
1550 | ||
1551 | /* the appropriate socket mutex must be held already */ | |
1552 | int _drbd_send_cmd(struct drbd_conf *mdev, struct socket *sock, | |
1553 | enum drbd_packets cmd, struct p_header *h, | |
1554 | size_t size, unsigned msg_flags) | |
1555 | { | |
1556 | int sent, ok; | |
1557 | ||
1558 | ERR_IF(!h) return FALSE; | |
1559 | ERR_IF(!size) return FALSE; | |
1560 | ||
1561 | h->magic = BE_DRBD_MAGIC; | |
1562 | h->command = cpu_to_be16(cmd); | |
1563 | h->length = cpu_to_be16(size-sizeof(struct p_header)); | |
1564 | ||
b411b363 PR |
1565 | sent = drbd_send(mdev, sock, h, size, msg_flags); |
1566 | ||
1567 | ok = (sent == size); | |
1568 | if (!ok) | |
1569 | dev_err(DEV, "short sent %s size=%d sent=%d\n", | |
1570 | cmdname(cmd), (int)size, sent); | |
1571 | return ok; | |
1572 | } | |
1573 | ||
1574 | /* don't pass the socket. we may only look at it | |
1575 | * when we hold the appropriate socket mutex. | |
1576 | */ | |
1577 | int drbd_send_cmd(struct drbd_conf *mdev, int use_data_socket, | |
1578 | enum drbd_packets cmd, struct p_header *h, size_t size) | |
1579 | { | |
1580 | int ok = 0; | |
1581 | struct socket *sock; | |
1582 | ||
1583 | if (use_data_socket) { | |
1584 | mutex_lock(&mdev->data.mutex); | |
1585 | sock = mdev->data.socket; | |
1586 | } else { | |
1587 | mutex_lock(&mdev->meta.mutex); | |
1588 | sock = mdev->meta.socket; | |
1589 | } | |
1590 | ||
1591 | /* drbd_disconnect() could have called drbd_free_sock() | |
1592 | * while we were waiting in down()... */ | |
1593 | if (likely(sock != NULL)) | |
1594 | ok = _drbd_send_cmd(mdev, sock, cmd, h, size, 0); | |
1595 | ||
1596 | if (use_data_socket) | |
1597 | mutex_unlock(&mdev->data.mutex); | |
1598 | else | |
1599 | mutex_unlock(&mdev->meta.mutex); | |
1600 | return ok; | |
1601 | } | |
1602 | ||
1603 | int drbd_send_cmd2(struct drbd_conf *mdev, enum drbd_packets cmd, char *data, | |
1604 | size_t size) | |
1605 | { | |
1606 | struct p_header h; | |
1607 | int ok; | |
1608 | ||
1609 | h.magic = BE_DRBD_MAGIC; | |
1610 | h.command = cpu_to_be16(cmd); | |
1611 | h.length = cpu_to_be16(size); | |
1612 | ||
1613 | if (!drbd_get_data_sock(mdev)) | |
1614 | return 0; | |
1615 | ||
b411b363 PR |
1616 | ok = (sizeof(h) == |
1617 | drbd_send(mdev, mdev->data.socket, &h, sizeof(h), 0)); | |
1618 | ok = ok && (size == | |
1619 | drbd_send(mdev, mdev->data.socket, data, size, 0)); | |
1620 | ||
1621 | drbd_put_data_sock(mdev); | |
1622 | ||
1623 | return ok; | |
1624 | } | |
1625 | ||
1626 | int drbd_send_sync_param(struct drbd_conf *mdev, struct syncer_conf *sc) | |
1627 | { | |
1628 | struct p_rs_param_89 *p; | |
1629 | struct socket *sock; | |
1630 | int size, rv; | |
1631 | const int apv = mdev->agreed_pro_version; | |
1632 | ||
1633 | size = apv <= 87 ? sizeof(struct p_rs_param) | |
1634 | : apv == 88 ? sizeof(struct p_rs_param) | |
1635 | + strlen(mdev->sync_conf.verify_alg) + 1 | |
1636 | : /* 89 */ sizeof(struct p_rs_param_89); | |
1637 | ||
1638 | /* used from admin command context and receiver/worker context. | |
1639 | * to avoid kmalloc, grab the socket right here, | |
1640 | * then use the pre-allocated sbuf there */ | |
1641 | mutex_lock(&mdev->data.mutex); | |
1642 | sock = mdev->data.socket; | |
1643 | ||
1644 | if (likely(sock != NULL)) { | |
1645 | enum drbd_packets cmd = apv >= 89 ? P_SYNC_PARAM89 : P_SYNC_PARAM; | |
1646 | ||
1647 | p = &mdev->data.sbuf.rs_param_89; | |
1648 | ||
1649 | /* initialize verify_alg and csums_alg */ | |
1650 | memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); | |
1651 | ||
1652 | p->rate = cpu_to_be32(sc->rate); | |
1653 | ||
1654 | if (apv >= 88) | |
1655 | strcpy(p->verify_alg, mdev->sync_conf.verify_alg); | |
1656 | if (apv >= 89) | |
1657 | strcpy(p->csums_alg, mdev->sync_conf.csums_alg); | |
1658 | ||
1659 | rv = _drbd_send_cmd(mdev, sock, cmd, &p->head, size, 0); | |
1660 | } else | |
1661 | rv = 0; /* not ok */ | |
1662 | ||
1663 | mutex_unlock(&mdev->data.mutex); | |
1664 | ||
1665 | return rv; | |
1666 | } | |
1667 | ||
1668 | int drbd_send_protocol(struct drbd_conf *mdev) | |
1669 | { | |
1670 | struct p_protocol *p; | |
1671 | int size, rv; | |
1672 | ||
1673 | size = sizeof(struct p_protocol); | |
1674 | ||
1675 | if (mdev->agreed_pro_version >= 87) | |
1676 | size += strlen(mdev->net_conf->integrity_alg) + 1; | |
1677 | ||
1678 | /* we must not recurse into our own queue, | |
1679 | * as that is blocked during handshake */ | |
1680 | p = kmalloc(size, GFP_NOIO); | |
1681 | if (p == NULL) | |
1682 | return 0; | |
1683 | ||
1684 | p->protocol = cpu_to_be32(mdev->net_conf->wire_protocol); | |
1685 | p->after_sb_0p = cpu_to_be32(mdev->net_conf->after_sb_0p); | |
1686 | p->after_sb_1p = cpu_to_be32(mdev->net_conf->after_sb_1p); | |
1687 | p->after_sb_2p = cpu_to_be32(mdev->net_conf->after_sb_2p); | |
1688 | p->want_lose = cpu_to_be32(mdev->net_conf->want_lose); | |
1689 | p->two_primaries = cpu_to_be32(mdev->net_conf->two_primaries); | |
1690 | ||
1691 | if (mdev->agreed_pro_version >= 87) | |
1692 | strcpy(p->integrity_alg, mdev->net_conf->integrity_alg); | |
1693 | ||
1694 | rv = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_PROTOCOL, | |
1695 | (struct p_header *)p, size); | |
1696 | kfree(p); | |
1697 | return rv; | |
1698 | } | |
1699 | ||
1700 | int _drbd_send_uuids(struct drbd_conf *mdev, u64 uuid_flags) | |
1701 | { | |
1702 | struct p_uuids p; | |
1703 | int i; | |
1704 | ||
1705 | if (!get_ldev_if_state(mdev, D_NEGOTIATING)) | |
1706 | return 1; | |
1707 | ||
1708 | for (i = UI_CURRENT; i < UI_SIZE; i++) | |
1709 | p.uuid[i] = mdev->ldev ? cpu_to_be64(mdev->ldev->md.uuid[i]) : 0; | |
1710 | ||
1711 | mdev->comm_bm_set = drbd_bm_total_weight(mdev); | |
1712 | p.uuid[UI_SIZE] = cpu_to_be64(mdev->comm_bm_set); | |
1713 | uuid_flags |= mdev->net_conf->want_lose ? 1 : 0; | |
1714 | uuid_flags |= test_bit(CRASHED_PRIMARY, &mdev->flags) ? 2 : 0; | |
1715 | uuid_flags |= mdev->new_state_tmp.disk == D_INCONSISTENT ? 4 : 0; | |
1716 | p.uuid[UI_FLAGS] = cpu_to_be64(uuid_flags); | |
1717 | ||
1718 | put_ldev(mdev); | |
1719 | ||
1720 | return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_UUIDS, | |
1721 | (struct p_header *)&p, sizeof(p)); | |
1722 | } | |
1723 | ||
1724 | int drbd_send_uuids(struct drbd_conf *mdev) | |
1725 | { | |
1726 | return _drbd_send_uuids(mdev, 0); | |
1727 | } | |
1728 | ||
1729 | int drbd_send_uuids_skip_initial_sync(struct drbd_conf *mdev) | |
1730 | { | |
1731 | return _drbd_send_uuids(mdev, 8); | |
1732 | } | |
1733 | ||
1734 | ||
1735 | int drbd_send_sync_uuid(struct drbd_conf *mdev, u64 val) | |
1736 | { | |
1737 | struct p_rs_uuid p; | |
1738 | ||
1739 | p.uuid = cpu_to_be64(val); | |
1740 | ||
1741 | return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_SYNC_UUID, | |
1742 | (struct p_header *)&p, sizeof(p)); | |
1743 | } | |
1744 | ||
1745 | int drbd_send_sizes(struct drbd_conf *mdev, int trigger_reply) | |
1746 | { | |
1747 | struct p_sizes p; | |
1748 | sector_t d_size, u_size; | |
1749 | int q_order_type; | |
1750 | int ok; | |
1751 | ||
1752 | if (get_ldev_if_state(mdev, D_NEGOTIATING)) { | |
1753 | D_ASSERT(mdev->ldev->backing_bdev); | |
1754 | d_size = drbd_get_max_capacity(mdev->ldev); | |
1755 | u_size = mdev->ldev->dc.disk_size; | |
1756 | q_order_type = drbd_queue_order_type(mdev); | |
1757 | p.queue_order_type = cpu_to_be32(drbd_queue_order_type(mdev)); | |
1758 | put_ldev(mdev); | |
1759 | } else { | |
1760 | d_size = 0; | |
1761 | u_size = 0; | |
1762 | q_order_type = QUEUE_ORDERED_NONE; | |
1763 | } | |
1764 | ||
1765 | p.d_size = cpu_to_be64(d_size); | |
1766 | p.u_size = cpu_to_be64(u_size); | |
1767 | p.c_size = cpu_to_be64(trigger_reply ? 0 : drbd_get_capacity(mdev->this_bdev)); | |
1768 | p.max_segment_size = cpu_to_be32(queue_max_segment_size(mdev->rq_queue)); | |
1769 | p.queue_order_type = cpu_to_be32(q_order_type); | |
1770 | ||
1771 | ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_SIZES, | |
1772 | (struct p_header *)&p, sizeof(p)); | |
1773 | return ok; | |
1774 | } | |
1775 | ||
1776 | /** | |
1777 | * drbd_send_state() - Sends the drbd state to the peer | |
1778 | * @mdev: DRBD device. | |
1779 | */ | |
1780 | int drbd_send_state(struct drbd_conf *mdev) | |
1781 | { | |
1782 | struct socket *sock; | |
1783 | struct p_state p; | |
1784 | int ok = 0; | |
1785 | ||
1786 | /* Grab state lock so we wont send state if we're in the middle | |
1787 | * of a cluster wide state change on another thread */ | |
1788 | drbd_state_lock(mdev); | |
1789 | ||
1790 | mutex_lock(&mdev->data.mutex); | |
1791 | ||
1792 | p.state = cpu_to_be32(mdev->state.i); /* Within the send mutex */ | |
1793 | sock = mdev->data.socket; | |
1794 | ||
1795 | if (likely(sock != NULL)) { | |
1796 | ok = _drbd_send_cmd(mdev, sock, P_STATE, | |
1797 | (struct p_header *)&p, sizeof(p), 0); | |
1798 | } | |
1799 | ||
1800 | mutex_unlock(&mdev->data.mutex); | |
1801 | ||
1802 | drbd_state_unlock(mdev); | |
1803 | return ok; | |
1804 | } | |
1805 | ||
1806 | int drbd_send_state_req(struct drbd_conf *mdev, | |
1807 | union drbd_state mask, union drbd_state val) | |
1808 | { | |
1809 | struct p_req_state p; | |
1810 | ||
1811 | p.mask = cpu_to_be32(mask.i); | |
1812 | p.val = cpu_to_be32(val.i); | |
1813 | ||
1814 | return drbd_send_cmd(mdev, USE_DATA_SOCKET, P_STATE_CHG_REQ, | |
1815 | (struct p_header *)&p, sizeof(p)); | |
1816 | } | |
1817 | ||
1818 | int drbd_send_sr_reply(struct drbd_conf *mdev, int retcode) | |
1819 | { | |
1820 | struct p_req_state_reply p; | |
1821 | ||
1822 | p.retcode = cpu_to_be32(retcode); | |
1823 | ||
1824 | return drbd_send_cmd(mdev, USE_META_SOCKET, P_STATE_CHG_REPLY, | |
1825 | (struct p_header *)&p, sizeof(p)); | |
1826 | } | |
1827 | ||
1828 | int fill_bitmap_rle_bits(struct drbd_conf *mdev, | |
1829 | struct p_compressed_bm *p, | |
1830 | struct bm_xfer_ctx *c) | |
1831 | { | |
1832 | struct bitstream bs; | |
1833 | unsigned long plain_bits; | |
1834 | unsigned long tmp; | |
1835 | unsigned long rl; | |
1836 | unsigned len; | |
1837 | unsigned toggle; | |
1838 | int bits; | |
1839 | ||
1840 | /* may we use this feature? */ | |
1841 | if ((mdev->sync_conf.use_rle == 0) || | |
1842 | (mdev->agreed_pro_version < 90)) | |
1843 | return 0; | |
1844 | ||
1845 | if (c->bit_offset >= c->bm_bits) | |
1846 | return 0; /* nothing to do. */ | |
1847 | ||
1848 | /* use at most thus many bytes */ | |
1849 | bitstream_init(&bs, p->code, BM_PACKET_VLI_BYTES_MAX, 0); | |
1850 | memset(p->code, 0, BM_PACKET_VLI_BYTES_MAX); | |
1851 | /* plain bits covered in this code string */ | |
1852 | plain_bits = 0; | |
1853 | ||
1854 | /* p->encoding & 0x80 stores whether the first run length is set. | |
1855 | * bit offset is implicit. | |
1856 | * start with toggle == 2 to be able to tell the first iteration */ | |
1857 | toggle = 2; | |
1858 | ||
1859 | /* see how much plain bits we can stuff into one packet | |
1860 | * using RLE and VLI. */ | |
1861 | do { | |
1862 | tmp = (toggle == 0) ? _drbd_bm_find_next_zero(mdev, c->bit_offset) | |
1863 | : _drbd_bm_find_next(mdev, c->bit_offset); | |
1864 | if (tmp == -1UL) | |
1865 | tmp = c->bm_bits; | |
1866 | rl = tmp - c->bit_offset; | |
1867 | ||
1868 | if (toggle == 2) { /* first iteration */ | |
1869 | if (rl == 0) { | |
1870 | /* the first checked bit was set, | |
1871 | * store start value, */ | |
1872 | DCBP_set_start(p, 1); | |
1873 | /* but skip encoding of zero run length */ | |
1874 | toggle = !toggle; | |
1875 | continue; | |
1876 | } | |
1877 | DCBP_set_start(p, 0); | |
1878 | } | |
1879 | ||
1880 | /* paranoia: catch zero runlength. | |
1881 | * can only happen if bitmap is modified while we scan it. */ | |
1882 | if (rl == 0) { | |
1883 | dev_err(DEV, "unexpected zero runlength while encoding bitmap " | |
1884 | "t:%u bo:%lu\n", toggle, c->bit_offset); | |
1885 | return -1; | |
1886 | } | |
1887 | ||
1888 | bits = vli_encode_bits(&bs, rl); | |
1889 | if (bits == -ENOBUFS) /* buffer full */ | |
1890 | break; | |
1891 | if (bits <= 0) { | |
1892 | dev_err(DEV, "error while encoding bitmap: %d\n", bits); | |
1893 | return 0; | |
1894 | } | |
1895 | ||
1896 | toggle = !toggle; | |
1897 | plain_bits += rl; | |
1898 | c->bit_offset = tmp; | |
1899 | } while (c->bit_offset < c->bm_bits); | |
1900 | ||
1901 | len = bs.cur.b - p->code + !!bs.cur.bit; | |
1902 | ||
1903 | if (plain_bits < (len << 3)) { | |
1904 | /* incompressible with this method. | |
1905 | * we need to rewind both word and bit position. */ | |
1906 | c->bit_offset -= plain_bits; | |
1907 | bm_xfer_ctx_bit_to_word_offset(c); | |
1908 | c->bit_offset = c->word_offset * BITS_PER_LONG; | |
1909 | return 0; | |
1910 | } | |
1911 | ||
1912 | /* RLE + VLI was able to compress it just fine. | |
1913 | * update c->word_offset. */ | |
1914 | bm_xfer_ctx_bit_to_word_offset(c); | |
1915 | ||
1916 | /* store pad_bits */ | |
1917 | DCBP_set_pad_bits(p, (8 - bs.cur.bit) & 0x7); | |
1918 | ||
1919 | return len; | |
1920 | } | |
1921 | ||
1922 | enum { OK, FAILED, DONE } | |
1923 | send_bitmap_rle_or_plain(struct drbd_conf *mdev, | |
1924 | struct p_header *h, struct bm_xfer_ctx *c) | |
1925 | { | |
1926 | struct p_compressed_bm *p = (void*)h; | |
1927 | unsigned long num_words; | |
1928 | int len; | |
1929 | int ok; | |
1930 | ||
1931 | len = fill_bitmap_rle_bits(mdev, p, c); | |
1932 | ||
1933 | if (len < 0) | |
1934 | return FAILED; | |
1935 | ||
1936 | if (len) { | |
1937 | DCBP_set_code(p, RLE_VLI_Bits); | |
1938 | ok = _drbd_send_cmd(mdev, mdev->data.socket, P_COMPRESSED_BITMAP, h, | |
1939 | sizeof(*p) + len, 0); | |
1940 | ||
1941 | c->packets[0]++; | |
1942 | c->bytes[0] += sizeof(*p) + len; | |
1943 | ||
1944 | if (c->bit_offset >= c->bm_bits) | |
1945 | len = 0; /* DONE */ | |
1946 | } else { | |
1947 | /* was not compressible. | |
1948 | * send a buffer full of plain text bits instead. */ | |
1949 | num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset); | |
1950 | len = num_words * sizeof(long); | |
1951 | if (len) | |
1952 | drbd_bm_get_lel(mdev, c->word_offset, num_words, (unsigned long*)h->payload); | |
1953 | ok = _drbd_send_cmd(mdev, mdev->data.socket, P_BITMAP, | |
1954 | h, sizeof(struct p_header) + len, 0); | |
1955 | c->word_offset += num_words; | |
1956 | c->bit_offset = c->word_offset * BITS_PER_LONG; | |
1957 | ||
1958 | c->packets[1]++; | |
1959 | c->bytes[1] += sizeof(struct p_header) + len; | |
1960 | ||
1961 | if (c->bit_offset > c->bm_bits) | |
1962 | c->bit_offset = c->bm_bits; | |
1963 | } | |
1964 | ok = ok ? ((len == 0) ? DONE : OK) : FAILED; | |
1965 | ||
1966 | if (ok == DONE) | |
1967 | INFO_bm_xfer_stats(mdev, "send", c); | |
1968 | return ok; | |
1969 | } | |
1970 | ||
1971 | /* See the comment at receive_bitmap() */ | |
1972 | int _drbd_send_bitmap(struct drbd_conf *mdev) | |
1973 | { | |
1974 | struct bm_xfer_ctx c; | |
1975 | struct p_header *p; | |
1976 | int ret; | |
1977 | ||
1978 | ERR_IF(!mdev->bitmap) return FALSE; | |
1979 | ||
1980 | /* maybe we should use some per thread scratch page, | |
1981 | * and allocate that during initial device creation? */ | |
1982 | p = (struct p_header *) __get_free_page(GFP_NOIO); | |
1983 | if (!p) { | |
1984 | dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__); | |
1985 | return FALSE; | |
1986 | } | |
1987 | ||
1988 | if (get_ldev(mdev)) { | |
1989 | if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) { | |
1990 | dev_info(DEV, "Writing the whole bitmap, MDF_FullSync was set.\n"); | |
1991 | drbd_bm_set_all(mdev); | |
1992 | if (drbd_bm_write(mdev)) { | |
1993 | /* write_bm did fail! Leave full sync flag set in Meta P_DATA | |
1994 | * but otherwise process as per normal - need to tell other | |
1995 | * side that a full resync is required! */ | |
1996 | dev_err(DEV, "Failed to write bitmap to disk!\n"); | |
1997 | } else { | |
1998 | drbd_md_clear_flag(mdev, MDF_FULL_SYNC); | |
1999 | drbd_md_sync(mdev); | |
2000 | } | |
2001 | } | |
2002 | put_ldev(mdev); | |
2003 | } | |
2004 | ||
2005 | c = (struct bm_xfer_ctx) { | |
2006 | .bm_bits = drbd_bm_bits(mdev), | |
2007 | .bm_words = drbd_bm_words(mdev), | |
2008 | }; | |
2009 | ||
2010 | do { | |
2011 | ret = send_bitmap_rle_or_plain(mdev, p, &c); | |
2012 | } while (ret == OK); | |
2013 | ||
2014 | free_page((unsigned long) p); | |
2015 | return (ret == DONE); | |
2016 | } | |
2017 | ||
2018 | int drbd_send_bitmap(struct drbd_conf *mdev) | |
2019 | { | |
2020 | int err; | |
2021 | ||
2022 | if (!drbd_get_data_sock(mdev)) | |
2023 | return -1; | |
2024 | err = !_drbd_send_bitmap(mdev); | |
2025 | drbd_put_data_sock(mdev); | |
2026 | return err; | |
2027 | } | |
2028 | ||
2029 | int drbd_send_b_ack(struct drbd_conf *mdev, u32 barrier_nr, u32 set_size) | |
2030 | { | |
2031 | int ok; | |
2032 | struct p_barrier_ack p; | |
2033 | ||
2034 | p.barrier = barrier_nr; | |
2035 | p.set_size = cpu_to_be32(set_size); | |
2036 | ||
2037 | if (mdev->state.conn < C_CONNECTED) | |
2038 | return FALSE; | |
2039 | ok = drbd_send_cmd(mdev, USE_META_SOCKET, P_BARRIER_ACK, | |
2040 | (struct p_header *)&p, sizeof(p)); | |
2041 | return ok; | |
2042 | } | |
2043 | ||
2044 | /** | |
2045 | * _drbd_send_ack() - Sends an ack packet | |
2046 | * @mdev: DRBD device. | |
2047 | * @cmd: Packet command code. | |
2048 | * @sector: sector, needs to be in big endian byte order | |
2049 | * @blksize: size in byte, needs to be in big endian byte order | |
2050 | * @block_id: Id, big endian byte order | |
2051 | */ | |
2052 | static int _drbd_send_ack(struct drbd_conf *mdev, enum drbd_packets cmd, | |
2053 | u64 sector, | |
2054 | u32 blksize, | |
2055 | u64 block_id) | |
2056 | { | |
2057 | int ok; | |
2058 | struct p_block_ack p; | |
2059 | ||
2060 | p.sector = sector; | |
2061 | p.block_id = block_id; | |
2062 | p.blksize = blksize; | |
2063 | p.seq_num = cpu_to_be32(atomic_add_return(1, &mdev->packet_seq)); | |
2064 | ||
2065 | if (!mdev->meta.socket || mdev->state.conn < C_CONNECTED) | |
2066 | return FALSE; | |
2067 | ok = drbd_send_cmd(mdev, USE_META_SOCKET, cmd, | |
2068 | (struct p_header *)&p, sizeof(p)); | |
2069 | return ok; | |
2070 | } | |
2071 | ||
2072 | int drbd_send_ack_dp(struct drbd_conf *mdev, enum drbd_packets cmd, | |
2073 | struct p_data *dp) | |
2074 | { | |
2075 | const int header_size = sizeof(struct p_data) | |
2076 | - sizeof(struct p_header); | |
2077 | int data_size = ((struct p_header *)dp)->length - header_size; | |
2078 | ||
2079 | return _drbd_send_ack(mdev, cmd, dp->sector, cpu_to_be32(data_size), | |
2080 | dp->block_id); | |
2081 | } | |
2082 | ||
2083 | int drbd_send_ack_rp(struct drbd_conf *mdev, enum drbd_packets cmd, | |
2084 | struct p_block_req *rp) | |
2085 | { | |
2086 | return _drbd_send_ack(mdev, cmd, rp->sector, rp->blksize, rp->block_id); | |
2087 | } | |
2088 | ||
2089 | /** | |
2090 | * drbd_send_ack() - Sends an ack packet | |
2091 | * @mdev: DRBD device. | |
2092 | * @cmd: Packet command code. | |
2093 | * @e: Epoch entry. | |
2094 | */ | |
2095 | int drbd_send_ack(struct drbd_conf *mdev, | |
2096 | enum drbd_packets cmd, struct drbd_epoch_entry *e) | |
2097 | { | |
2098 | return _drbd_send_ack(mdev, cmd, | |
2099 | cpu_to_be64(e->sector), | |
2100 | cpu_to_be32(e->size), | |
2101 | e->block_id); | |
2102 | } | |
2103 | ||
2104 | /* This function misuses the block_id field to signal if the blocks | |
2105 | * are is sync or not. */ | |
2106 | int drbd_send_ack_ex(struct drbd_conf *mdev, enum drbd_packets cmd, | |
2107 | sector_t sector, int blksize, u64 block_id) | |
2108 | { | |
2109 | return _drbd_send_ack(mdev, cmd, | |
2110 | cpu_to_be64(sector), | |
2111 | cpu_to_be32(blksize), | |
2112 | cpu_to_be64(block_id)); | |
2113 | } | |
2114 | ||
2115 | int drbd_send_drequest(struct drbd_conf *mdev, int cmd, | |
2116 | sector_t sector, int size, u64 block_id) | |
2117 | { | |
2118 | int ok; | |
2119 | struct p_block_req p; | |
2120 | ||
2121 | p.sector = cpu_to_be64(sector); | |
2122 | p.block_id = block_id; | |
2123 | p.blksize = cpu_to_be32(size); | |
2124 | ||
2125 | ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, cmd, | |
2126 | (struct p_header *)&p, sizeof(p)); | |
2127 | return ok; | |
2128 | } | |
2129 | ||
2130 | int drbd_send_drequest_csum(struct drbd_conf *mdev, | |
2131 | sector_t sector, int size, | |
2132 | void *digest, int digest_size, | |
2133 | enum drbd_packets cmd) | |
2134 | { | |
2135 | int ok; | |
2136 | struct p_block_req p; | |
2137 | ||
2138 | p.sector = cpu_to_be64(sector); | |
2139 | p.block_id = BE_DRBD_MAGIC + 0xbeef; | |
2140 | p.blksize = cpu_to_be32(size); | |
2141 | ||
2142 | p.head.magic = BE_DRBD_MAGIC; | |
2143 | p.head.command = cpu_to_be16(cmd); | |
2144 | p.head.length = cpu_to_be16(sizeof(p) - sizeof(struct p_header) + digest_size); | |
2145 | ||
2146 | mutex_lock(&mdev->data.mutex); | |
2147 | ||
2148 | ok = (sizeof(p) == drbd_send(mdev, mdev->data.socket, &p, sizeof(p), 0)); | |
2149 | ok = ok && (digest_size == drbd_send(mdev, mdev->data.socket, digest, digest_size, 0)); | |
2150 | ||
2151 | mutex_unlock(&mdev->data.mutex); | |
2152 | ||
2153 | return ok; | |
2154 | } | |
2155 | ||
2156 | int drbd_send_ov_request(struct drbd_conf *mdev, sector_t sector, int size) | |
2157 | { | |
2158 | int ok; | |
2159 | struct p_block_req p; | |
2160 | ||
2161 | p.sector = cpu_to_be64(sector); | |
2162 | p.block_id = BE_DRBD_MAGIC + 0xbabe; | |
2163 | p.blksize = cpu_to_be32(size); | |
2164 | ||
2165 | ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, P_OV_REQUEST, | |
2166 | (struct p_header *)&p, sizeof(p)); | |
2167 | return ok; | |
2168 | } | |
2169 | ||
2170 | /* called on sndtimeo | |
2171 | * returns FALSE if we should retry, | |
2172 | * TRUE if we think connection is dead | |
2173 | */ | |
2174 | static int we_should_drop_the_connection(struct drbd_conf *mdev, struct socket *sock) | |
2175 | { | |
2176 | int drop_it; | |
2177 | /* long elapsed = (long)(jiffies - mdev->last_received); */ | |
2178 | ||
2179 | drop_it = mdev->meta.socket == sock | |
2180 | || !mdev->asender.task | |
2181 | || get_t_state(&mdev->asender) != Running | |
2182 | || mdev->state.conn < C_CONNECTED; | |
2183 | ||
2184 | if (drop_it) | |
2185 | return TRUE; | |
2186 | ||
2187 | drop_it = !--mdev->ko_count; | |
2188 | if (!drop_it) { | |
2189 | dev_err(DEV, "[%s/%d] sock_sendmsg time expired, ko = %u\n", | |
2190 | current->comm, current->pid, mdev->ko_count); | |
2191 | request_ping(mdev); | |
2192 | } | |
2193 | ||
2194 | return drop_it; /* && (mdev->state == R_PRIMARY) */; | |
2195 | } | |
2196 | ||
2197 | /* The idea of sendpage seems to be to put some kind of reference | |
2198 | * to the page into the skb, and to hand it over to the NIC. In | |
2199 | * this process get_page() gets called. | |
2200 | * | |
2201 | * As soon as the page was really sent over the network put_page() | |
2202 | * gets called by some part of the network layer. [ NIC driver? ] | |
2203 | * | |
2204 | * [ get_page() / put_page() increment/decrement the count. If count | |
2205 | * reaches 0 the page will be freed. ] | |
2206 | * | |
2207 | * This works nicely with pages from FSs. | |
2208 | * But this means that in protocol A we might signal IO completion too early! | |
2209 | * | |
2210 | * In order not to corrupt data during a resync we must make sure | |
2211 | * that we do not reuse our own buffer pages (EEs) to early, therefore | |
2212 | * we have the net_ee list. | |
2213 | * | |
2214 | * XFS seems to have problems, still, it submits pages with page_count == 0! | |
2215 | * As a workaround, we disable sendpage on pages | |
2216 | * with page_count == 0 or PageSlab. | |
2217 | */ | |
2218 | static int _drbd_no_send_page(struct drbd_conf *mdev, struct page *page, | |
2219 | int offset, size_t size) | |
2220 | { | |
2221 | int sent = drbd_send(mdev, mdev->data.socket, kmap(page) + offset, size, 0); | |
2222 | kunmap(page); | |
2223 | if (sent == size) | |
2224 | mdev->send_cnt += size>>9; | |
2225 | return sent == size; | |
2226 | } | |
2227 | ||
2228 | static int _drbd_send_page(struct drbd_conf *mdev, struct page *page, | |
2229 | int offset, size_t size) | |
2230 | { | |
2231 | mm_segment_t oldfs = get_fs(); | |
2232 | int sent, ok; | |
2233 | int len = size; | |
2234 | ||
2235 | /* e.g. XFS meta- & log-data is in slab pages, which have a | |
2236 | * page_count of 0 and/or have PageSlab() set. | |
2237 | * we cannot use send_page for those, as that does get_page(); | |
2238 | * put_page(); and would cause either a VM_BUG directly, or | |
2239 | * __page_cache_release a page that would actually still be referenced | |
2240 | * by someone, leading to some obscure delayed Oops somewhere else. */ | |
2241 | if (disable_sendpage || (page_count(page) < 1) || PageSlab(page)) | |
2242 | return _drbd_no_send_page(mdev, page, offset, size); | |
2243 | ||
2244 | drbd_update_congested(mdev); | |
2245 | set_fs(KERNEL_DS); | |
2246 | do { | |
2247 | sent = mdev->data.socket->ops->sendpage(mdev->data.socket, page, | |
2248 | offset, len, | |
2249 | MSG_NOSIGNAL); | |
2250 | if (sent == -EAGAIN) { | |
2251 | if (we_should_drop_the_connection(mdev, | |
2252 | mdev->data.socket)) | |
2253 | break; | |
2254 | else | |
2255 | continue; | |
2256 | } | |
2257 | if (sent <= 0) { | |
2258 | dev_warn(DEV, "%s: size=%d len=%d sent=%d\n", | |
2259 | __func__, (int)size, len, sent); | |
2260 | break; | |
2261 | } | |
2262 | len -= sent; | |
2263 | offset += sent; | |
2264 | } while (len > 0 /* THINK && mdev->cstate >= C_CONNECTED*/); | |
2265 | set_fs(oldfs); | |
2266 | clear_bit(NET_CONGESTED, &mdev->flags); | |
2267 | ||
2268 | ok = (len == 0); | |
2269 | if (likely(ok)) | |
2270 | mdev->send_cnt += size>>9; | |
2271 | return ok; | |
2272 | } | |
2273 | ||
2274 | static int _drbd_send_bio(struct drbd_conf *mdev, struct bio *bio) | |
2275 | { | |
2276 | struct bio_vec *bvec; | |
2277 | int i; | |
2278 | __bio_for_each_segment(bvec, bio, i, 0) { | |
2279 | if (!_drbd_no_send_page(mdev, bvec->bv_page, | |
2280 | bvec->bv_offset, bvec->bv_len)) | |
2281 | return 0; | |
2282 | } | |
2283 | return 1; | |
2284 | } | |
2285 | ||
2286 | static int _drbd_send_zc_bio(struct drbd_conf *mdev, struct bio *bio) | |
2287 | { | |
2288 | struct bio_vec *bvec; | |
2289 | int i; | |
2290 | __bio_for_each_segment(bvec, bio, i, 0) { | |
2291 | if (!_drbd_send_page(mdev, bvec->bv_page, | |
2292 | bvec->bv_offset, bvec->bv_len)) | |
2293 | return 0; | |
2294 | } | |
2295 | ||
2296 | return 1; | |
2297 | } | |
2298 | ||
2299 | /* Used to send write requests | |
2300 | * R_PRIMARY -> Peer (P_DATA) | |
2301 | */ | |
2302 | int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req) | |
2303 | { | |
2304 | int ok = 1; | |
2305 | struct p_data p; | |
2306 | unsigned int dp_flags = 0; | |
2307 | void *dgb; | |
2308 | int dgs; | |
2309 | ||
2310 | if (!drbd_get_data_sock(mdev)) | |
2311 | return 0; | |
2312 | ||
2313 | dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_w_tfm) ? | |
2314 | crypto_hash_digestsize(mdev->integrity_w_tfm) : 0; | |
2315 | ||
2316 | p.head.magic = BE_DRBD_MAGIC; | |
2317 | p.head.command = cpu_to_be16(P_DATA); | |
2318 | p.head.length = | |
2319 | cpu_to_be16(sizeof(p) - sizeof(struct p_header) + dgs + req->size); | |
2320 | ||
2321 | p.sector = cpu_to_be64(req->sector); | |
2322 | p.block_id = (unsigned long)req; | |
2323 | p.seq_num = cpu_to_be32(req->seq_num = | |
2324 | atomic_add_return(1, &mdev->packet_seq)); | |
2325 | dp_flags = 0; | |
2326 | ||
2327 | /* NOTE: no need to check if barriers supported here as we would | |
2328 | * not pass the test in make_request_common in that case | |
2329 | */ | |
2330 | if (bio_rw_flagged(req->master_bio, BIO_RW_BARRIER)) { | |
2331 | dev_err(DEV, "ASSERT FAILED would have set DP_HARDBARRIER\n"); | |
2332 | /* dp_flags |= DP_HARDBARRIER; */ | |
2333 | } | |
2334 | if (bio_rw_flagged(req->master_bio, BIO_RW_SYNCIO)) | |
2335 | dp_flags |= DP_RW_SYNC; | |
2336 | /* for now handle SYNCIO and UNPLUG | |
2337 | * as if they still were one and the same flag */ | |
2338 | if (bio_rw_flagged(req->master_bio, BIO_RW_UNPLUG)) | |
2339 | dp_flags |= DP_RW_SYNC; | |
2340 | if (mdev->state.conn >= C_SYNC_SOURCE && | |
2341 | mdev->state.conn <= C_PAUSED_SYNC_T) | |
2342 | dp_flags |= DP_MAY_SET_IN_SYNC; | |
2343 | ||
2344 | p.dp_flags = cpu_to_be32(dp_flags); | |
b411b363 PR |
2345 | set_bit(UNPLUG_REMOTE, &mdev->flags); |
2346 | ok = (sizeof(p) == | |
2347 | drbd_send(mdev, mdev->data.socket, &p, sizeof(p), MSG_MORE)); | |
2348 | if (ok && dgs) { | |
2349 | dgb = mdev->int_dig_out; | |
2350 | drbd_csum(mdev, mdev->integrity_w_tfm, req->master_bio, dgb); | |
2351 | ok = drbd_send(mdev, mdev->data.socket, dgb, dgs, MSG_MORE); | |
2352 | } | |
2353 | if (ok) { | |
2354 | if (mdev->net_conf->wire_protocol == DRBD_PROT_A) | |
2355 | ok = _drbd_send_bio(mdev, req->master_bio); | |
2356 | else | |
2357 | ok = _drbd_send_zc_bio(mdev, req->master_bio); | |
2358 | } | |
2359 | ||
2360 | drbd_put_data_sock(mdev); | |
2361 | return ok; | |
2362 | } | |
2363 | ||
2364 | /* answer packet, used to send data back for read requests: | |
2365 | * Peer -> (diskless) R_PRIMARY (P_DATA_REPLY) | |
2366 | * C_SYNC_SOURCE -> C_SYNC_TARGET (P_RS_DATA_REPLY) | |
2367 | */ | |
2368 | int drbd_send_block(struct drbd_conf *mdev, enum drbd_packets cmd, | |
2369 | struct drbd_epoch_entry *e) | |
2370 | { | |
2371 | int ok; | |
2372 | struct p_data p; | |
2373 | void *dgb; | |
2374 | int dgs; | |
2375 | ||
2376 | dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_w_tfm) ? | |
2377 | crypto_hash_digestsize(mdev->integrity_w_tfm) : 0; | |
2378 | ||
2379 | p.head.magic = BE_DRBD_MAGIC; | |
2380 | p.head.command = cpu_to_be16(cmd); | |
2381 | p.head.length = | |
2382 | cpu_to_be16(sizeof(p) - sizeof(struct p_header) + dgs + e->size); | |
2383 | ||
2384 | p.sector = cpu_to_be64(e->sector); | |
2385 | p.block_id = e->block_id; | |
2386 | /* p.seq_num = 0; No sequence numbers here.. */ | |
2387 | ||
2388 | /* Only called by our kernel thread. | |
2389 | * This one may be interrupted by DRBD_SIG and/or DRBD_SIGKILL | |
2390 | * in response to admin command or module unload. | |
2391 | */ | |
2392 | if (!drbd_get_data_sock(mdev)) | |
2393 | return 0; | |
2394 | ||
b411b363 PR |
2395 | ok = sizeof(p) == drbd_send(mdev, mdev->data.socket, &p, |
2396 | sizeof(p), MSG_MORE); | |
2397 | if (ok && dgs) { | |
2398 | dgb = mdev->int_dig_out; | |
2399 | drbd_csum(mdev, mdev->integrity_w_tfm, e->private_bio, dgb); | |
2400 | ok = drbd_send(mdev, mdev->data.socket, dgb, dgs, MSG_MORE); | |
2401 | } | |
2402 | if (ok) | |
2403 | ok = _drbd_send_zc_bio(mdev, e->private_bio); | |
2404 | ||
2405 | drbd_put_data_sock(mdev); | |
2406 | return ok; | |
2407 | } | |
2408 | ||
2409 | /* | |
2410 | drbd_send distinguishes two cases: | |
2411 | ||
2412 | Packets sent via the data socket "sock" | |
2413 | and packets sent via the meta data socket "msock" | |
2414 | ||
2415 | sock msock | |
2416 | -----------------+-------------------------+------------------------------ | |
2417 | timeout conf.timeout / 2 conf.timeout / 2 | |
2418 | timeout action send a ping via msock Abort communication | |
2419 | and close all sockets | |
2420 | */ | |
2421 | ||
2422 | /* | |
2423 | * you must have down()ed the appropriate [m]sock_mutex elsewhere! | |
2424 | */ | |
2425 | int drbd_send(struct drbd_conf *mdev, struct socket *sock, | |
2426 | void *buf, size_t size, unsigned msg_flags) | |
2427 | { | |
2428 | struct kvec iov; | |
2429 | struct msghdr msg; | |
2430 | int rv, sent = 0; | |
2431 | ||
2432 | if (!sock) | |
2433 | return -1000; | |
2434 | ||
2435 | /* THINK if (signal_pending) return ... ? */ | |
2436 | ||
2437 | iov.iov_base = buf; | |
2438 | iov.iov_len = size; | |
2439 | ||
2440 | msg.msg_name = NULL; | |
2441 | msg.msg_namelen = 0; | |
2442 | msg.msg_control = NULL; | |
2443 | msg.msg_controllen = 0; | |
2444 | msg.msg_flags = msg_flags | MSG_NOSIGNAL; | |
2445 | ||
2446 | if (sock == mdev->data.socket) { | |
2447 | mdev->ko_count = mdev->net_conf->ko_count; | |
2448 | drbd_update_congested(mdev); | |
2449 | } | |
2450 | do { | |
2451 | /* STRANGE | |
2452 | * tcp_sendmsg does _not_ use its size parameter at all ? | |
2453 | * | |
2454 | * -EAGAIN on timeout, -EINTR on signal. | |
2455 | */ | |
2456 | /* THINK | |
2457 | * do we need to block DRBD_SIG if sock == &meta.socket ?? | |
2458 | * otherwise wake_asender() might interrupt some send_*Ack ! | |
2459 | */ | |
2460 | rv = kernel_sendmsg(sock, &msg, &iov, 1, size); | |
2461 | if (rv == -EAGAIN) { | |
2462 | if (we_should_drop_the_connection(mdev, sock)) | |
2463 | break; | |
2464 | else | |
2465 | continue; | |
2466 | } | |
2467 | D_ASSERT(rv != 0); | |
2468 | if (rv == -EINTR) { | |
2469 | flush_signals(current); | |
2470 | rv = 0; | |
2471 | } | |
2472 | if (rv < 0) | |
2473 | break; | |
2474 | sent += rv; | |
2475 | iov.iov_base += rv; | |
2476 | iov.iov_len -= rv; | |
2477 | } while (sent < size); | |
2478 | ||
2479 | if (sock == mdev->data.socket) | |
2480 | clear_bit(NET_CONGESTED, &mdev->flags); | |
2481 | ||
2482 | if (rv <= 0) { | |
2483 | if (rv != -EAGAIN) { | |
2484 | dev_err(DEV, "%s_sendmsg returned %d\n", | |
2485 | sock == mdev->meta.socket ? "msock" : "sock", | |
2486 | rv); | |
2487 | drbd_force_state(mdev, NS(conn, C_BROKEN_PIPE)); | |
2488 | } else | |
2489 | drbd_force_state(mdev, NS(conn, C_TIMEOUT)); | |
2490 | } | |
2491 | ||
2492 | return sent; | |
2493 | } | |
2494 | ||
2495 | static int drbd_open(struct block_device *bdev, fmode_t mode) | |
2496 | { | |
2497 | struct drbd_conf *mdev = bdev->bd_disk->private_data; | |
2498 | unsigned long flags; | |
2499 | int rv = 0; | |
2500 | ||
2501 | spin_lock_irqsave(&mdev->req_lock, flags); | |
2502 | /* to have a stable mdev->state.role | |
2503 | * and no race with updating open_cnt */ | |
2504 | ||
2505 | if (mdev->state.role != R_PRIMARY) { | |
2506 | if (mode & FMODE_WRITE) | |
2507 | rv = -EROFS; | |
2508 | else if (!allow_oos) | |
2509 | rv = -EMEDIUMTYPE; | |
2510 | } | |
2511 | ||
2512 | if (!rv) | |
2513 | mdev->open_cnt++; | |
2514 | spin_unlock_irqrestore(&mdev->req_lock, flags); | |
2515 | ||
2516 | return rv; | |
2517 | } | |
2518 | ||
2519 | static int drbd_release(struct gendisk *gd, fmode_t mode) | |
2520 | { | |
2521 | struct drbd_conf *mdev = gd->private_data; | |
2522 | mdev->open_cnt--; | |
2523 | return 0; | |
2524 | } | |
2525 | ||
2526 | static void drbd_unplug_fn(struct request_queue *q) | |
2527 | { | |
2528 | struct drbd_conf *mdev = q->queuedata; | |
2529 | ||
b411b363 PR |
2530 | /* unplug FIRST */ |
2531 | spin_lock_irq(q->queue_lock); | |
2532 | blk_remove_plug(q); | |
2533 | spin_unlock_irq(q->queue_lock); | |
2534 | ||
2535 | /* only if connected */ | |
2536 | spin_lock_irq(&mdev->req_lock); | |
2537 | if (mdev->state.pdsk >= D_INCONSISTENT && mdev->state.conn >= C_CONNECTED) { | |
2538 | D_ASSERT(mdev->state.role == R_PRIMARY); | |
2539 | if (test_and_clear_bit(UNPLUG_REMOTE, &mdev->flags)) { | |
2540 | /* add to the data.work queue, | |
2541 | * unless already queued. | |
2542 | * XXX this might be a good addition to drbd_queue_work | |
2543 | * anyways, to detect "double queuing" ... */ | |
2544 | if (list_empty(&mdev->unplug_work.list)) | |
2545 | drbd_queue_work(&mdev->data.work, | |
2546 | &mdev->unplug_work); | |
2547 | } | |
2548 | } | |
2549 | spin_unlock_irq(&mdev->req_lock); | |
2550 | ||
2551 | if (mdev->state.disk >= D_INCONSISTENT) | |
2552 | drbd_kick_lo(mdev); | |
2553 | } | |
2554 | ||
2555 | static void drbd_set_defaults(struct drbd_conf *mdev) | |
2556 | { | |
2557 | mdev->sync_conf.after = DRBD_AFTER_DEF; | |
2558 | mdev->sync_conf.rate = DRBD_RATE_DEF; | |
2559 | mdev->sync_conf.al_extents = DRBD_AL_EXTENTS_DEF; | |
2560 | mdev->state = (union drbd_state) { | |
2561 | { .role = R_SECONDARY, | |
2562 | .peer = R_UNKNOWN, | |
2563 | .conn = C_STANDALONE, | |
2564 | .disk = D_DISKLESS, | |
2565 | .pdsk = D_UNKNOWN, | |
2566 | .susp = 0 | |
2567 | } }; | |
2568 | } | |
2569 | ||
2570 | void drbd_init_set_defaults(struct drbd_conf *mdev) | |
2571 | { | |
2572 | /* the memset(,0,) did most of this. | |
2573 | * note: only assignments, no allocation in here */ | |
2574 | ||
2575 | drbd_set_defaults(mdev); | |
2576 | ||
2577 | /* for now, we do NOT yet support it, | |
2578 | * even though we start some framework | |
2579 | * to eventually support barriers */ | |
2580 | set_bit(NO_BARRIER_SUPP, &mdev->flags); | |
2581 | ||
2582 | atomic_set(&mdev->ap_bio_cnt, 0); | |
2583 | atomic_set(&mdev->ap_pending_cnt, 0); | |
2584 | atomic_set(&mdev->rs_pending_cnt, 0); | |
2585 | atomic_set(&mdev->unacked_cnt, 0); | |
2586 | atomic_set(&mdev->local_cnt, 0); | |
2587 | atomic_set(&mdev->net_cnt, 0); | |
2588 | atomic_set(&mdev->packet_seq, 0); | |
2589 | atomic_set(&mdev->pp_in_use, 0); | |
2590 | ||
2591 | mutex_init(&mdev->md_io_mutex); | |
2592 | mutex_init(&mdev->data.mutex); | |
2593 | mutex_init(&mdev->meta.mutex); | |
2594 | sema_init(&mdev->data.work.s, 0); | |
2595 | sema_init(&mdev->meta.work.s, 0); | |
2596 | mutex_init(&mdev->state_mutex); | |
2597 | ||
2598 | spin_lock_init(&mdev->data.work.q_lock); | |
2599 | spin_lock_init(&mdev->meta.work.q_lock); | |
2600 | ||
2601 | spin_lock_init(&mdev->al_lock); | |
2602 | spin_lock_init(&mdev->req_lock); | |
2603 | spin_lock_init(&mdev->peer_seq_lock); | |
2604 | spin_lock_init(&mdev->epoch_lock); | |
2605 | ||
2606 | INIT_LIST_HEAD(&mdev->active_ee); | |
2607 | INIT_LIST_HEAD(&mdev->sync_ee); | |
2608 | INIT_LIST_HEAD(&mdev->done_ee); | |
2609 | INIT_LIST_HEAD(&mdev->read_ee); | |
2610 | INIT_LIST_HEAD(&mdev->net_ee); | |
2611 | INIT_LIST_HEAD(&mdev->resync_reads); | |
2612 | INIT_LIST_HEAD(&mdev->data.work.q); | |
2613 | INIT_LIST_HEAD(&mdev->meta.work.q); | |
2614 | INIT_LIST_HEAD(&mdev->resync_work.list); | |
2615 | INIT_LIST_HEAD(&mdev->unplug_work.list); | |
2616 | INIT_LIST_HEAD(&mdev->md_sync_work.list); | |
2617 | INIT_LIST_HEAD(&mdev->bm_io_work.w.list); | |
2618 | mdev->resync_work.cb = w_resync_inactive; | |
2619 | mdev->unplug_work.cb = w_send_write_hint; | |
2620 | mdev->md_sync_work.cb = w_md_sync; | |
2621 | mdev->bm_io_work.w.cb = w_bitmap_io; | |
2622 | init_timer(&mdev->resync_timer); | |
2623 | init_timer(&mdev->md_sync_timer); | |
2624 | mdev->resync_timer.function = resync_timer_fn; | |
2625 | mdev->resync_timer.data = (unsigned long) mdev; | |
2626 | mdev->md_sync_timer.function = md_sync_timer_fn; | |
2627 | mdev->md_sync_timer.data = (unsigned long) mdev; | |
2628 | ||
2629 | init_waitqueue_head(&mdev->misc_wait); | |
2630 | init_waitqueue_head(&mdev->state_wait); | |
2631 | init_waitqueue_head(&mdev->ee_wait); | |
2632 | init_waitqueue_head(&mdev->al_wait); | |
2633 | init_waitqueue_head(&mdev->seq_wait); | |
2634 | ||
2635 | drbd_thread_init(mdev, &mdev->receiver, drbdd_init); | |
2636 | drbd_thread_init(mdev, &mdev->worker, drbd_worker); | |
2637 | drbd_thread_init(mdev, &mdev->asender, drbd_asender); | |
2638 | ||
2639 | mdev->agreed_pro_version = PRO_VERSION_MAX; | |
2640 | mdev->write_ordering = WO_bio_barrier; | |
2641 | mdev->resync_wenr = LC_FREE; | |
2642 | } | |
2643 | ||
2644 | void drbd_mdev_cleanup(struct drbd_conf *mdev) | |
2645 | { | |
2646 | if (mdev->receiver.t_state != None) | |
2647 | dev_err(DEV, "ASSERT FAILED: receiver t_state == %d expected 0.\n", | |
2648 | mdev->receiver.t_state); | |
2649 | ||
2650 | /* no need to lock it, I'm the only thread alive */ | |
2651 | if (atomic_read(&mdev->current_epoch->epoch_size) != 0) | |
2652 | dev_err(DEV, "epoch_size:%d\n", atomic_read(&mdev->current_epoch->epoch_size)); | |
2653 | mdev->al_writ_cnt = | |
2654 | mdev->bm_writ_cnt = | |
2655 | mdev->read_cnt = | |
2656 | mdev->recv_cnt = | |
2657 | mdev->send_cnt = | |
2658 | mdev->writ_cnt = | |
2659 | mdev->p_size = | |
2660 | mdev->rs_start = | |
2661 | mdev->rs_total = | |
2662 | mdev->rs_failed = | |
2663 | mdev->rs_mark_left = | |
2664 | mdev->rs_mark_time = 0; | |
2665 | D_ASSERT(mdev->net_conf == NULL); | |
2666 | ||
2667 | drbd_set_my_capacity(mdev, 0); | |
2668 | if (mdev->bitmap) { | |
2669 | /* maybe never allocated. */ | |
2670 | drbd_bm_resize(mdev, 0); | |
2671 | drbd_bm_cleanup(mdev); | |
2672 | } | |
2673 | ||
2674 | drbd_free_resources(mdev); | |
2675 | ||
2676 | /* | |
2677 | * currently we drbd_init_ee only on module load, so | |
2678 | * we may do drbd_release_ee only on module unload! | |
2679 | */ | |
2680 | D_ASSERT(list_empty(&mdev->active_ee)); | |
2681 | D_ASSERT(list_empty(&mdev->sync_ee)); | |
2682 | D_ASSERT(list_empty(&mdev->done_ee)); | |
2683 | D_ASSERT(list_empty(&mdev->read_ee)); | |
2684 | D_ASSERT(list_empty(&mdev->net_ee)); | |
2685 | D_ASSERT(list_empty(&mdev->resync_reads)); | |
2686 | D_ASSERT(list_empty(&mdev->data.work.q)); | |
2687 | D_ASSERT(list_empty(&mdev->meta.work.q)); | |
2688 | D_ASSERT(list_empty(&mdev->resync_work.list)); | |
2689 | D_ASSERT(list_empty(&mdev->unplug_work.list)); | |
2690 | ||
2691 | } | |
2692 | ||
2693 | ||
2694 | static void drbd_destroy_mempools(void) | |
2695 | { | |
2696 | struct page *page; | |
2697 | ||
2698 | while (drbd_pp_pool) { | |
2699 | page = drbd_pp_pool; | |
2700 | drbd_pp_pool = (struct page *)page_private(page); | |
2701 | __free_page(page); | |
2702 | drbd_pp_vacant--; | |
2703 | } | |
2704 | ||
2705 | /* D_ASSERT(atomic_read(&drbd_pp_vacant)==0); */ | |
2706 | ||
2707 | if (drbd_ee_mempool) | |
2708 | mempool_destroy(drbd_ee_mempool); | |
2709 | if (drbd_request_mempool) | |
2710 | mempool_destroy(drbd_request_mempool); | |
2711 | if (drbd_ee_cache) | |
2712 | kmem_cache_destroy(drbd_ee_cache); | |
2713 | if (drbd_request_cache) | |
2714 | kmem_cache_destroy(drbd_request_cache); | |
2715 | if (drbd_bm_ext_cache) | |
2716 | kmem_cache_destroy(drbd_bm_ext_cache); | |
2717 | if (drbd_al_ext_cache) | |
2718 | kmem_cache_destroy(drbd_al_ext_cache); | |
2719 | ||
2720 | drbd_ee_mempool = NULL; | |
2721 | drbd_request_mempool = NULL; | |
2722 | drbd_ee_cache = NULL; | |
2723 | drbd_request_cache = NULL; | |
2724 | drbd_bm_ext_cache = NULL; | |
2725 | drbd_al_ext_cache = NULL; | |
2726 | ||
2727 | return; | |
2728 | } | |
2729 | ||
2730 | static int drbd_create_mempools(void) | |
2731 | { | |
2732 | struct page *page; | |
2733 | const int number = (DRBD_MAX_SEGMENT_SIZE/PAGE_SIZE) * minor_count; | |
2734 | int i; | |
2735 | ||
2736 | /* prepare our caches and mempools */ | |
2737 | drbd_request_mempool = NULL; | |
2738 | drbd_ee_cache = NULL; | |
2739 | drbd_request_cache = NULL; | |
2740 | drbd_bm_ext_cache = NULL; | |
2741 | drbd_al_ext_cache = NULL; | |
2742 | drbd_pp_pool = NULL; | |
2743 | ||
2744 | /* caches */ | |
2745 | drbd_request_cache = kmem_cache_create( | |
2746 | "drbd_req", sizeof(struct drbd_request), 0, 0, NULL); | |
2747 | if (drbd_request_cache == NULL) | |
2748 | goto Enomem; | |
2749 | ||
2750 | drbd_ee_cache = kmem_cache_create( | |
2751 | "drbd_ee", sizeof(struct drbd_epoch_entry), 0, 0, NULL); | |
2752 | if (drbd_ee_cache == NULL) | |
2753 | goto Enomem; | |
2754 | ||
2755 | drbd_bm_ext_cache = kmem_cache_create( | |
2756 | "drbd_bm", sizeof(struct bm_extent), 0, 0, NULL); | |
2757 | if (drbd_bm_ext_cache == NULL) | |
2758 | goto Enomem; | |
2759 | ||
2760 | drbd_al_ext_cache = kmem_cache_create( | |
2761 | "drbd_al", sizeof(struct lc_element), 0, 0, NULL); | |
2762 | if (drbd_al_ext_cache == NULL) | |
2763 | goto Enomem; | |
2764 | ||
2765 | /* mempools */ | |
2766 | drbd_request_mempool = mempool_create(number, | |
2767 | mempool_alloc_slab, mempool_free_slab, drbd_request_cache); | |
2768 | if (drbd_request_mempool == NULL) | |
2769 | goto Enomem; | |
2770 | ||
2771 | drbd_ee_mempool = mempool_create(number, | |
2772 | mempool_alloc_slab, mempool_free_slab, drbd_ee_cache); | |
2773 | if (drbd_request_mempool == NULL) | |
2774 | goto Enomem; | |
2775 | ||
2776 | /* drbd's page pool */ | |
2777 | spin_lock_init(&drbd_pp_lock); | |
2778 | ||
2779 | for (i = 0; i < number; i++) { | |
2780 | page = alloc_page(GFP_HIGHUSER); | |
2781 | if (!page) | |
2782 | goto Enomem; | |
2783 | set_page_private(page, (unsigned long)drbd_pp_pool); | |
2784 | drbd_pp_pool = page; | |
2785 | } | |
2786 | drbd_pp_vacant = number; | |
2787 | ||
2788 | return 0; | |
2789 | ||
2790 | Enomem: | |
2791 | drbd_destroy_mempools(); /* in case we allocated some */ | |
2792 | return -ENOMEM; | |
2793 | } | |
2794 | ||
2795 | static int drbd_notify_sys(struct notifier_block *this, unsigned long code, | |
2796 | void *unused) | |
2797 | { | |
2798 | /* just so we have it. you never know what interesting things we | |
2799 | * might want to do here some day... | |
2800 | */ | |
2801 | ||
2802 | return NOTIFY_DONE; | |
2803 | } | |
2804 | ||
2805 | static struct notifier_block drbd_notifier = { | |
2806 | .notifier_call = drbd_notify_sys, | |
2807 | }; | |
2808 | ||
2809 | static void drbd_release_ee_lists(struct drbd_conf *mdev) | |
2810 | { | |
2811 | int rr; | |
2812 | ||
2813 | rr = drbd_release_ee(mdev, &mdev->active_ee); | |
2814 | if (rr) | |
2815 | dev_err(DEV, "%d EEs in active list found!\n", rr); | |
2816 | ||
2817 | rr = drbd_release_ee(mdev, &mdev->sync_ee); | |
2818 | if (rr) | |
2819 | dev_err(DEV, "%d EEs in sync list found!\n", rr); | |
2820 | ||
2821 | rr = drbd_release_ee(mdev, &mdev->read_ee); | |
2822 | if (rr) | |
2823 | dev_err(DEV, "%d EEs in read list found!\n", rr); | |
2824 | ||
2825 | rr = drbd_release_ee(mdev, &mdev->done_ee); | |
2826 | if (rr) | |
2827 | dev_err(DEV, "%d EEs in done list found!\n", rr); | |
2828 | ||
2829 | rr = drbd_release_ee(mdev, &mdev->net_ee); | |
2830 | if (rr) | |
2831 | dev_err(DEV, "%d EEs in net list found!\n", rr); | |
2832 | } | |
2833 | ||
2834 | /* caution. no locking. | |
2835 | * currently only used from module cleanup code. */ | |
2836 | static void drbd_delete_device(unsigned int minor) | |
2837 | { | |
2838 | struct drbd_conf *mdev = minor_to_mdev(minor); | |
2839 | ||
2840 | if (!mdev) | |
2841 | return; | |
2842 | ||
2843 | /* paranoia asserts */ | |
2844 | if (mdev->open_cnt != 0) | |
2845 | dev_err(DEV, "open_cnt = %d in %s:%u", mdev->open_cnt, | |
2846 | __FILE__ , __LINE__); | |
2847 | ||
2848 | ERR_IF (!list_empty(&mdev->data.work.q)) { | |
2849 | struct list_head *lp; | |
2850 | list_for_each(lp, &mdev->data.work.q) { | |
2851 | dev_err(DEV, "lp = %p\n", lp); | |
2852 | } | |
2853 | }; | |
2854 | /* end paranoia asserts */ | |
2855 | ||
2856 | del_gendisk(mdev->vdisk); | |
2857 | ||
2858 | /* cleanup stuff that may have been allocated during | |
2859 | * device (re-)configuration or state changes */ | |
2860 | ||
2861 | if (mdev->this_bdev) | |
2862 | bdput(mdev->this_bdev); | |
2863 | ||
2864 | drbd_free_resources(mdev); | |
2865 | ||
2866 | drbd_release_ee_lists(mdev); | |
2867 | ||
2868 | /* should be free'd on disconnect? */ | |
2869 | kfree(mdev->ee_hash); | |
2870 | /* | |
2871 | mdev->ee_hash_s = 0; | |
2872 | mdev->ee_hash = NULL; | |
2873 | */ | |
2874 | ||
2875 | lc_destroy(mdev->act_log); | |
2876 | lc_destroy(mdev->resync); | |
2877 | ||
2878 | kfree(mdev->p_uuid); | |
2879 | /* mdev->p_uuid = NULL; */ | |
2880 | ||
2881 | kfree(mdev->int_dig_out); | |
2882 | kfree(mdev->int_dig_in); | |
2883 | kfree(mdev->int_dig_vv); | |
2884 | ||
2885 | /* cleanup the rest that has been | |
2886 | * allocated from drbd_new_device | |
2887 | * and actually free the mdev itself */ | |
2888 | drbd_free_mdev(mdev); | |
2889 | } | |
2890 | ||
2891 | static void drbd_cleanup(void) | |
2892 | { | |
2893 | unsigned int i; | |
2894 | ||
2895 | unregister_reboot_notifier(&drbd_notifier); | |
2896 | ||
2897 | drbd_nl_cleanup(); | |
2898 | ||
2899 | if (minor_table) { | |
2900 | if (drbd_proc) | |
2901 | remove_proc_entry("drbd", NULL); | |
2902 | i = minor_count; | |
2903 | while (i--) | |
2904 | drbd_delete_device(i); | |
2905 | drbd_destroy_mempools(); | |
2906 | } | |
2907 | ||
2908 | kfree(minor_table); | |
2909 | ||
2910 | unregister_blkdev(DRBD_MAJOR, "drbd"); | |
2911 | ||
2912 | printk(KERN_INFO "drbd: module cleanup done.\n"); | |
2913 | } | |
2914 | ||
2915 | /** | |
2916 | * drbd_congested() - Callback for pdflush | |
2917 | * @congested_data: User data | |
2918 | * @bdi_bits: Bits pdflush is currently interested in | |
2919 | * | |
2920 | * Returns 1<<BDI_async_congested and/or 1<<BDI_sync_congested if we are congested. | |
2921 | */ | |
2922 | static int drbd_congested(void *congested_data, int bdi_bits) | |
2923 | { | |
2924 | struct drbd_conf *mdev = congested_data; | |
2925 | struct request_queue *q; | |
2926 | char reason = '-'; | |
2927 | int r = 0; | |
2928 | ||
2929 | if (!__inc_ap_bio_cond(mdev)) { | |
2930 | /* DRBD has frozen IO */ | |
2931 | r = bdi_bits; | |
2932 | reason = 'd'; | |
2933 | goto out; | |
2934 | } | |
2935 | ||
2936 | if (get_ldev(mdev)) { | |
2937 | q = bdev_get_queue(mdev->ldev->backing_bdev); | |
2938 | r = bdi_congested(&q->backing_dev_info, bdi_bits); | |
2939 | put_ldev(mdev); | |
2940 | if (r) | |
2941 | reason = 'b'; | |
2942 | } | |
2943 | ||
2944 | if (bdi_bits & (1 << BDI_async_congested) && test_bit(NET_CONGESTED, &mdev->flags)) { | |
2945 | r |= (1 << BDI_async_congested); | |
2946 | reason = reason == 'b' ? 'a' : 'n'; | |
2947 | } | |
2948 | ||
2949 | out: | |
2950 | mdev->congestion_reason = reason; | |
2951 | return r; | |
2952 | } | |
2953 | ||
2954 | struct drbd_conf *drbd_new_device(unsigned int minor) | |
2955 | { | |
2956 | struct drbd_conf *mdev; | |
2957 | struct gendisk *disk; | |
2958 | struct request_queue *q; | |
2959 | ||
2960 | /* GFP_KERNEL, we are outside of all write-out paths */ | |
2961 | mdev = kzalloc(sizeof(struct drbd_conf), GFP_KERNEL); | |
2962 | if (!mdev) | |
2963 | return NULL; | |
2964 | if (!zalloc_cpumask_var(&mdev->cpu_mask, GFP_KERNEL)) | |
2965 | goto out_no_cpumask; | |
2966 | ||
2967 | mdev->minor = minor; | |
2968 | ||
2969 | drbd_init_set_defaults(mdev); | |
2970 | ||
2971 | q = blk_alloc_queue(GFP_KERNEL); | |
2972 | if (!q) | |
2973 | goto out_no_q; | |
2974 | mdev->rq_queue = q; | |
2975 | q->queuedata = mdev; | |
2976 | blk_queue_max_segment_size(q, DRBD_MAX_SEGMENT_SIZE); | |
2977 | ||
2978 | disk = alloc_disk(1); | |
2979 | if (!disk) | |
2980 | goto out_no_disk; | |
2981 | mdev->vdisk = disk; | |
2982 | ||
2983 | set_disk_ro(disk, TRUE); | |
2984 | ||
2985 | disk->queue = q; | |
2986 | disk->major = DRBD_MAJOR; | |
2987 | disk->first_minor = minor; | |
2988 | disk->fops = &drbd_ops; | |
2989 | sprintf(disk->disk_name, "drbd%d", minor); | |
2990 | disk->private_data = mdev; | |
2991 | ||
2992 | mdev->this_bdev = bdget(MKDEV(DRBD_MAJOR, minor)); | |
2993 | /* we have no partitions. we contain only ourselves. */ | |
2994 | mdev->this_bdev->bd_contains = mdev->this_bdev; | |
2995 | ||
2996 | q->backing_dev_info.congested_fn = drbd_congested; | |
2997 | q->backing_dev_info.congested_data = mdev; | |
2998 | ||
2999 | blk_queue_make_request(q, drbd_make_request_26); | |
3000 | blk_queue_bounce_limit(q, BLK_BOUNCE_ANY); | |
3001 | blk_queue_merge_bvec(q, drbd_merge_bvec); | |
3002 | q->queue_lock = &mdev->req_lock; /* needed since we use */ | |
3003 | /* plugging on a queue, that actually has no requests! */ | |
3004 | q->unplug_fn = drbd_unplug_fn; | |
3005 | ||
3006 | mdev->md_io_page = alloc_page(GFP_KERNEL); | |
3007 | if (!mdev->md_io_page) | |
3008 | goto out_no_io_page; | |
3009 | ||
3010 | if (drbd_bm_init(mdev)) | |
3011 | goto out_no_bitmap; | |
3012 | /* no need to lock access, we are still initializing this minor device. */ | |
3013 | if (!tl_init(mdev)) | |
3014 | goto out_no_tl; | |
3015 | ||
3016 | mdev->app_reads_hash = kzalloc(APP_R_HSIZE*sizeof(void *), GFP_KERNEL); | |
3017 | if (!mdev->app_reads_hash) | |
3018 | goto out_no_app_reads; | |
3019 | ||
3020 | mdev->current_epoch = kzalloc(sizeof(struct drbd_epoch), GFP_KERNEL); | |
3021 | if (!mdev->current_epoch) | |
3022 | goto out_no_epoch; | |
3023 | ||
3024 | INIT_LIST_HEAD(&mdev->current_epoch->list); | |
3025 | mdev->epochs = 1; | |
3026 | ||
3027 | return mdev; | |
3028 | ||
3029 | /* out_whatever_else: | |
3030 | kfree(mdev->current_epoch); */ | |
3031 | out_no_epoch: | |
3032 | kfree(mdev->app_reads_hash); | |
3033 | out_no_app_reads: | |
3034 | tl_cleanup(mdev); | |
3035 | out_no_tl: | |
3036 | drbd_bm_cleanup(mdev); | |
3037 | out_no_bitmap: | |
3038 | __free_page(mdev->md_io_page); | |
3039 | out_no_io_page: | |
3040 | put_disk(disk); | |
3041 | out_no_disk: | |
3042 | blk_cleanup_queue(q); | |
3043 | out_no_q: | |
3044 | free_cpumask_var(mdev->cpu_mask); | |
3045 | out_no_cpumask: | |
3046 | kfree(mdev); | |
3047 | return NULL; | |
3048 | } | |
3049 | ||
3050 | /* counterpart of drbd_new_device. | |
3051 | * last part of drbd_delete_device. */ | |
3052 | void drbd_free_mdev(struct drbd_conf *mdev) | |
3053 | { | |
3054 | kfree(mdev->current_epoch); | |
3055 | kfree(mdev->app_reads_hash); | |
3056 | tl_cleanup(mdev); | |
3057 | if (mdev->bitmap) /* should no longer be there. */ | |
3058 | drbd_bm_cleanup(mdev); | |
3059 | __free_page(mdev->md_io_page); | |
3060 | put_disk(mdev->vdisk); | |
3061 | blk_cleanup_queue(mdev->rq_queue); | |
3062 | free_cpumask_var(mdev->cpu_mask); | |
3063 | kfree(mdev); | |
3064 | } | |
3065 | ||
3066 | ||
3067 | int __init drbd_init(void) | |
3068 | { | |
3069 | int err; | |
3070 | ||
3071 | if (sizeof(struct p_handshake) != 80) { | |
3072 | printk(KERN_ERR | |
3073 | "drbd: never change the size or layout " | |
3074 | "of the HandShake packet.\n"); | |
3075 | return -EINVAL; | |
3076 | } | |
3077 | ||
3078 | if (1 > minor_count || minor_count > 255) { | |
3079 | printk(KERN_ERR | |
3080 | "drbd: invalid minor_count (%d)\n", minor_count); | |
3081 | #ifdef MODULE | |
3082 | return -EINVAL; | |
3083 | #else | |
3084 | minor_count = 8; | |
3085 | #endif | |
3086 | } | |
3087 | ||
3088 | err = drbd_nl_init(); | |
3089 | if (err) | |
3090 | return err; | |
3091 | ||
3092 | err = register_blkdev(DRBD_MAJOR, "drbd"); | |
3093 | if (err) { | |
3094 | printk(KERN_ERR | |
3095 | "drbd: unable to register block device major %d\n", | |
3096 | DRBD_MAJOR); | |
3097 | return err; | |
3098 | } | |
3099 | ||
3100 | register_reboot_notifier(&drbd_notifier); | |
3101 | ||
3102 | /* | |
3103 | * allocate all necessary structs | |
3104 | */ | |
3105 | err = -ENOMEM; | |
3106 | ||
3107 | init_waitqueue_head(&drbd_pp_wait); | |
3108 | ||
3109 | drbd_proc = NULL; /* play safe for drbd_cleanup */ | |
3110 | minor_table = kzalloc(sizeof(struct drbd_conf *)*minor_count, | |
3111 | GFP_KERNEL); | |
3112 | if (!minor_table) | |
3113 | goto Enomem; | |
3114 | ||
3115 | err = drbd_create_mempools(); | |
3116 | if (err) | |
3117 | goto Enomem; | |
3118 | ||
3119 | drbd_proc = proc_create("drbd", S_IFREG | S_IRUGO , NULL, &drbd_proc_fops); | |
3120 | if (!drbd_proc) { | |
3121 | printk(KERN_ERR "drbd: unable to register proc file\n"); | |
3122 | goto Enomem; | |
3123 | } | |
3124 | ||
3125 | rwlock_init(&global_state_lock); | |
3126 | ||
3127 | printk(KERN_INFO "drbd: initialized. " | |
3128 | "Version: " REL_VERSION " (api:%d/proto:%d-%d)\n", | |
3129 | API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX); | |
3130 | printk(KERN_INFO "drbd: %s\n", drbd_buildtag()); | |
3131 | printk(KERN_INFO "drbd: registered as block device major %d\n", | |
3132 | DRBD_MAJOR); | |
3133 | printk(KERN_INFO "drbd: minor_table @ 0x%p\n", minor_table); | |
3134 | ||
3135 | return 0; /* Success! */ | |
3136 | ||
3137 | Enomem: | |
3138 | drbd_cleanup(); | |
3139 | if (err == -ENOMEM) | |
3140 | /* currently always the case */ | |
3141 | printk(KERN_ERR "drbd: ran out of memory\n"); | |
3142 | else | |
3143 | printk(KERN_ERR "drbd: initialization failure\n"); | |
3144 | return err; | |
3145 | } | |
3146 | ||
3147 | void drbd_free_bc(struct drbd_backing_dev *ldev) | |
3148 | { | |
3149 | if (ldev == NULL) | |
3150 | return; | |
3151 | ||
3152 | bd_release(ldev->backing_bdev); | |
3153 | bd_release(ldev->md_bdev); | |
3154 | ||
3155 | fput(ldev->lo_file); | |
3156 | fput(ldev->md_file); | |
3157 | ||
3158 | kfree(ldev); | |
3159 | } | |
3160 | ||
3161 | void drbd_free_sock(struct drbd_conf *mdev) | |
3162 | { | |
3163 | if (mdev->data.socket) { | |
3164 | kernel_sock_shutdown(mdev->data.socket, SHUT_RDWR); | |
3165 | sock_release(mdev->data.socket); | |
3166 | mdev->data.socket = NULL; | |
3167 | } | |
3168 | if (mdev->meta.socket) { | |
3169 | kernel_sock_shutdown(mdev->meta.socket, SHUT_RDWR); | |
3170 | sock_release(mdev->meta.socket); | |
3171 | mdev->meta.socket = NULL; | |
3172 | } | |
3173 | } | |
3174 | ||
3175 | ||
3176 | void drbd_free_resources(struct drbd_conf *mdev) | |
3177 | { | |
3178 | crypto_free_hash(mdev->csums_tfm); | |
3179 | mdev->csums_tfm = NULL; | |
3180 | crypto_free_hash(mdev->verify_tfm); | |
3181 | mdev->verify_tfm = NULL; | |
3182 | crypto_free_hash(mdev->cram_hmac_tfm); | |
3183 | mdev->cram_hmac_tfm = NULL; | |
3184 | crypto_free_hash(mdev->integrity_w_tfm); | |
3185 | mdev->integrity_w_tfm = NULL; | |
3186 | crypto_free_hash(mdev->integrity_r_tfm); | |
3187 | mdev->integrity_r_tfm = NULL; | |
3188 | ||
3189 | drbd_free_sock(mdev); | |
3190 | ||
3191 | __no_warn(local, | |
3192 | drbd_free_bc(mdev->ldev); | |
3193 | mdev->ldev = NULL;); | |
3194 | } | |
3195 | ||
3196 | /* meta data management */ | |
3197 | ||
3198 | struct meta_data_on_disk { | |
3199 | u64 la_size; /* last agreed size. */ | |
3200 | u64 uuid[UI_SIZE]; /* UUIDs. */ | |
3201 | u64 device_uuid; | |
3202 | u64 reserved_u64_1; | |
3203 | u32 flags; /* MDF */ | |
3204 | u32 magic; | |
3205 | u32 md_size_sect; | |
3206 | u32 al_offset; /* offset to this block */ | |
3207 | u32 al_nr_extents; /* important for restoring the AL */ | |
3208 | /* `-- act_log->nr_elements <-- sync_conf.al_extents */ | |
3209 | u32 bm_offset; /* offset to the bitmap, from here */ | |
3210 | u32 bm_bytes_per_bit; /* BM_BLOCK_SIZE */ | |
3211 | u32 reserved_u32[4]; | |
3212 | ||
3213 | } __packed; | |
3214 | ||
3215 | /** | |
3216 | * drbd_md_sync() - Writes the meta data super block if the MD_DIRTY flag bit is set | |
3217 | * @mdev: DRBD device. | |
3218 | */ | |
3219 | void drbd_md_sync(struct drbd_conf *mdev) | |
3220 | { | |
3221 | struct meta_data_on_disk *buffer; | |
3222 | sector_t sector; | |
3223 | int i; | |
3224 | ||
3225 | if (!test_and_clear_bit(MD_DIRTY, &mdev->flags)) | |
3226 | return; | |
3227 | del_timer(&mdev->md_sync_timer); | |
3228 | ||
3229 | /* We use here D_FAILED and not D_ATTACHING because we try to write | |
3230 | * metadata even if we detach due to a disk failure! */ | |
3231 | if (!get_ldev_if_state(mdev, D_FAILED)) | |
3232 | return; | |
3233 | ||
b411b363 PR |
3234 | mutex_lock(&mdev->md_io_mutex); |
3235 | buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page); | |
3236 | memset(buffer, 0, 512); | |
3237 | ||
3238 | buffer->la_size = cpu_to_be64(drbd_get_capacity(mdev->this_bdev)); | |
3239 | for (i = UI_CURRENT; i < UI_SIZE; i++) | |
3240 | buffer->uuid[i] = cpu_to_be64(mdev->ldev->md.uuid[i]); | |
3241 | buffer->flags = cpu_to_be32(mdev->ldev->md.flags); | |
3242 | buffer->magic = cpu_to_be32(DRBD_MD_MAGIC); | |
3243 | ||
3244 | buffer->md_size_sect = cpu_to_be32(mdev->ldev->md.md_size_sect); | |
3245 | buffer->al_offset = cpu_to_be32(mdev->ldev->md.al_offset); | |
3246 | buffer->al_nr_extents = cpu_to_be32(mdev->act_log->nr_elements); | |
3247 | buffer->bm_bytes_per_bit = cpu_to_be32(BM_BLOCK_SIZE); | |
3248 | buffer->device_uuid = cpu_to_be64(mdev->ldev->md.device_uuid); | |
3249 | ||
3250 | buffer->bm_offset = cpu_to_be32(mdev->ldev->md.bm_offset); | |
3251 | ||
3252 | D_ASSERT(drbd_md_ss__(mdev, mdev->ldev) == mdev->ldev->md.md_offset); | |
3253 | sector = mdev->ldev->md.md_offset; | |
3254 | ||
3255 | if (drbd_md_sync_page_io(mdev, mdev->ldev, sector, WRITE)) { | |
3256 | clear_bit(MD_DIRTY, &mdev->flags); | |
3257 | } else { | |
3258 | /* this was a try anyways ... */ | |
3259 | dev_err(DEV, "meta data update failed!\n"); | |
3260 | ||
3261 | drbd_chk_io_error(mdev, 1, TRUE); | |
3262 | } | |
3263 | ||
3264 | /* Update mdev->ldev->md.la_size_sect, | |
3265 | * since we updated it on metadata. */ | |
3266 | mdev->ldev->md.la_size_sect = drbd_get_capacity(mdev->this_bdev); | |
3267 | ||
3268 | mutex_unlock(&mdev->md_io_mutex); | |
3269 | put_ldev(mdev); | |
3270 | } | |
3271 | ||
3272 | /** | |
3273 | * drbd_md_read() - Reads in the meta data super block | |
3274 | * @mdev: DRBD device. | |
3275 | * @bdev: Device from which the meta data should be read in. | |
3276 | * | |
3277 | * Return 0 (NO_ERROR) on success, and an enum drbd_ret_codes in case | |
3278 | * something goes wrong. Currently only: ERR_IO_MD_DISK, ERR_MD_INVALID. | |
3279 | */ | |
3280 | int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev) | |
3281 | { | |
3282 | struct meta_data_on_disk *buffer; | |
3283 | int i, rv = NO_ERROR; | |
3284 | ||
3285 | if (!get_ldev_if_state(mdev, D_ATTACHING)) | |
3286 | return ERR_IO_MD_DISK; | |
3287 | ||
b411b363 PR |
3288 | mutex_lock(&mdev->md_io_mutex); |
3289 | buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page); | |
3290 | ||
3291 | if (!drbd_md_sync_page_io(mdev, bdev, bdev->md.md_offset, READ)) { | |
3292 | /* NOTE: cant do normal error processing here as this is | |
3293 | called BEFORE disk is attached */ | |
3294 | dev_err(DEV, "Error while reading metadata.\n"); | |
3295 | rv = ERR_IO_MD_DISK; | |
3296 | goto err; | |
3297 | } | |
3298 | ||
3299 | if (be32_to_cpu(buffer->magic) != DRBD_MD_MAGIC) { | |
3300 | dev_err(DEV, "Error while reading metadata, magic not found.\n"); | |
3301 | rv = ERR_MD_INVALID; | |
3302 | goto err; | |
3303 | } | |
3304 | if (be32_to_cpu(buffer->al_offset) != bdev->md.al_offset) { | |
3305 | dev_err(DEV, "unexpected al_offset: %d (expected %d)\n", | |
3306 | be32_to_cpu(buffer->al_offset), bdev->md.al_offset); | |
3307 | rv = ERR_MD_INVALID; | |
3308 | goto err; | |
3309 | } | |
3310 | if (be32_to_cpu(buffer->bm_offset) != bdev->md.bm_offset) { | |
3311 | dev_err(DEV, "unexpected bm_offset: %d (expected %d)\n", | |
3312 | be32_to_cpu(buffer->bm_offset), bdev->md.bm_offset); | |
3313 | rv = ERR_MD_INVALID; | |
3314 | goto err; | |
3315 | } | |
3316 | if (be32_to_cpu(buffer->md_size_sect) != bdev->md.md_size_sect) { | |
3317 | dev_err(DEV, "unexpected md_size: %u (expected %u)\n", | |
3318 | be32_to_cpu(buffer->md_size_sect), bdev->md.md_size_sect); | |
3319 | rv = ERR_MD_INVALID; | |
3320 | goto err; | |
3321 | } | |
3322 | ||
3323 | if (be32_to_cpu(buffer->bm_bytes_per_bit) != BM_BLOCK_SIZE) { | |
3324 | dev_err(DEV, "unexpected bm_bytes_per_bit: %u (expected %u)\n", | |
3325 | be32_to_cpu(buffer->bm_bytes_per_bit), BM_BLOCK_SIZE); | |
3326 | rv = ERR_MD_INVALID; | |
3327 | goto err; | |
3328 | } | |
3329 | ||
3330 | bdev->md.la_size_sect = be64_to_cpu(buffer->la_size); | |
3331 | for (i = UI_CURRENT; i < UI_SIZE; i++) | |
3332 | bdev->md.uuid[i] = be64_to_cpu(buffer->uuid[i]); | |
3333 | bdev->md.flags = be32_to_cpu(buffer->flags); | |
3334 | mdev->sync_conf.al_extents = be32_to_cpu(buffer->al_nr_extents); | |
3335 | bdev->md.device_uuid = be64_to_cpu(buffer->device_uuid); | |
3336 | ||
3337 | if (mdev->sync_conf.al_extents < 7) | |
3338 | mdev->sync_conf.al_extents = 127; | |
3339 | ||
3340 | err: | |
3341 | mutex_unlock(&mdev->md_io_mutex); | |
3342 | put_ldev(mdev); | |
3343 | ||
3344 | return rv; | |
3345 | } | |
3346 | ||
3347 | /** | |
3348 | * drbd_md_mark_dirty() - Mark meta data super block as dirty | |
3349 | * @mdev: DRBD device. | |
3350 | * | |
3351 | * Call this function if you change anything that should be written to | |
3352 | * the meta-data super block. This function sets MD_DIRTY, and starts a | |
3353 | * timer that ensures that within five seconds you have to call drbd_md_sync(). | |
3354 | */ | |
3355 | void drbd_md_mark_dirty(struct drbd_conf *mdev) | |
3356 | { | |
3357 | set_bit(MD_DIRTY, &mdev->flags); | |
3358 | mod_timer(&mdev->md_sync_timer, jiffies + 5*HZ); | |
3359 | } | |
3360 | ||
3361 | ||
3362 | static void drbd_uuid_move_history(struct drbd_conf *mdev) __must_hold(local) | |
3363 | { | |
3364 | int i; | |
3365 | ||
6a0afdf5 | 3366 | for (i = UI_HISTORY_START; i < UI_HISTORY_END; i++) |
b411b363 | 3367 | mdev->ldev->md.uuid[i+1] = mdev->ldev->md.uuid[i]; |
b411b363 PR |
3368 | } |
3369 | ||
3370 | void _drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local) | |
3371 | { | |
3372 | if (idx == UI_CURRENT) { | |
3373 | if (mdev->state.role == R_PRIMARY) | |
3374 | val |= 1; | |
3375 | else | |
3376 | val &= ~((u64)1); | |
3377 | ||
3378 | drbd_set_ed_uuid(mdev, val); | |
3379 | } | |
3380 | ||
3381 | mdev->ldev->md.uuid[idx] = val; | |
b411b363 PR |
3382 | drbd_md_mark_dirty(mdev); |
3383 | } | |
3384 | ||
3385 | ||
3386 | void drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local) | |
3387 | { | |
3388 | if (mdev->ldev->md.uuid[idx]) { | |
3389 | drbd_uuid_move_history(mdev); | |
3390 | mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[idx]; | |
b411b363 PR |
3391 | } |
3392 | _drbd_uuid_set(mdev, idx, val); | |
3393 | } | |
3394 | ||
3395 | /** | |
3396 | * drbd_uuid_new_current() - Creates a new current UUID | |
3397 | * @mdev: DRBD device. | |
3398 | * | |
3399 | * Creates a new current UUID, and rotates the old current UUID into | |
3400 | * the bitmap slot. Causes an incremental resync upon next connect. | |
3401 | */ | |
3402 | void drbd_uuid_new_current(struct drbd_conf *mdev) __must_hold(local) | |
3403 | { | |
3404 | u64 val; | |
3405 | ||
3406 | dev_info(DEV, "Creating new current UUID\n"); | |
3407 | D_ASSERT(mdev->ldev->md.uuid[UI_BITMAP] == 0); | |
3408 | mdev->ldev->md.uuid[UI_BITMAP] = mdev->ldev->md.uuid[UI_CURRENT]; | |
b411b363 PR |
3409 | |
3410 | get_random_bytes(&val, sizeof(u64)); | |
3411 | _drbd_uuid_set(mdev, UI_CURRENT, val); | |
3412 | } | |
3413 | ||
3414 | void drbd_uuid_set_bm(struct drbd_conf *mdev, u64 val) __must_hold(local) | |
3415 | { | |
3416 | if (mdev->ldev->md.uuid[UI_BITMAP] == 0 && val == 0) | |
3417 | return; | |
3418 | ||
3419 | if (val == 0) { | |
3420 | drbd_uuid_move_history(mdev); | |
3421 | mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[UI_BITMAP]; | |
3422 | mdev->ldev->md.uuid[UI_BITMAP] = 0; | |
b411b363 PR |
3423 | } else { |
3424 | if (mdev->ldev->md.uuid[UI_BITMAP]) | |
3425 | dev_warn(DEV, "bm UUID already set"); | |
3426 | ||
3427 | mdev->ldev->md.uuid[UI_BITMAP] = val; | |
3428 | mdev->ldev->md.uuid[UI_BITMAP] &= ~((u64)1); | |
3429 | ||
b411b363 PR |
3430 | } |
3431 | drbd_md_mark_dirty(mdev); | |
3432 | } | |
3433 | ||
3434 | /** | |
3435 | * drbd_bmio_set_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io() | |
3436 | * @mdev: DRBD device. | |
3437 | * | |
3438 | * Sets all bits in the bitmap and writes the whole bitmap to stable storage. | |
3439 | */ | |
3440 | int drbd_bmio_set_n_write(struct drbd_conf *mdev) | |
3441 | { | |
3442 | int rv = -EIO; | |
3443 | ||
3444 | if (get_ldev_if_state(mdev, D_ATTACHING)) { | |
3445 | drbd_md_set_flag(mdev, MDF_FULL_SYNC); | |
3446 | drbd_md_sync(mdev); | |
3447 | drbd_bm_set_all(mdev); | |
3448 | ||
3449 | rv = drbd_bm_write(mdev); | |
3450 | ||
3451 | if (!rv) { | |
3452 | drbd_md_clear_flag(mdev, MDF_FULL_SYNC); | |
3453 | drbd_md_sync(mdev); | |
3454 | } | |
3455 | ||
3456 | put_ldev(mdev); | |
3457 | } | |
3458 | ||
3459 | return rv; | |
3460 | } | |
3461 | ||
3462 | /** | |
3463 | * drbd_bmio_clear_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io() | |
3464 | * @mdev: DRBD device. | |
3465 | * | |
3466 | * Clears all bits in the bitmap and writes the whole bitmap to stable storage. | |
3467 | */ | |
3468 | int drbd_bmio_clear_n_write(struct drbd_conf *mdev) | |
3469 | { | |
3470 | int rv = -EIO; | |
3471 | ||
3472 | if (get_ldev_if_state(mdev, D_ATTACHING)) { | |
3473 | drbd_bm_clear_all(mdev); | |
3474 | rv = drbd_bm_write(mdev); | |
3475 | put_ldev(mdev); | |
3476 | } | |
3477 | ||
3478 | return rv; | |
3479 | } | |
3480 | ||
3481 | static int w_bitmap_io(struct drbd_conf *mdev, struct drbd_work *w, int unused) | |
3482 | { | |
3483 | struct bm_io_work *work = container_of(w, struct bm_io_work, w); | |
3484 | int rv; | |
3485 | ||
3486 | D_ASSERT(atomic_read(&mdev->ap_bio_cnt) == 0); | |
3487 | ||
3488 | drbd_bm_lock(mdev, work->why); | |
3489 | rv = work->io_fn(mdev); | |
3490 | drbd_bm_unlock(mdev); | |
3491 | ||
3492 | clear_bit(BITMAP_IO, &mdev->flags); | |
3493 | wake_up(&mdev->misc_wait); | |
3494 | ||
3495 | if (work->done) | |
3496 | work->done(mdev, rv); | |
3497 | ||
3498 | clear_bit(BITMAP_IO_QUEUED, &mdev->flags); | |
3499 | work->why = NULL; | |
3500 | ||
3501 | return 1; | |
3502 | } | |
3503 | ||
3504 | /** | |
3505 | * drbd_queue_bitmap_io() - Queues an IO operation on the whole bitmap | |
3506 | * @mdev: DRBD device. | |
3507 | * @io_fn: IO callback to be called when bitmap IO is possible | |
3508 | * @done: callback to be called after the bitmap IO was performed | |
3509 | * @why: Descriptive text of the reason for doing the IO | |
3510 | * | |
3511 | * While IO on the bitmap happens we freeze application IO thus we ensure | |
3512 | * that drbd_set_out_of_sync() can not be called. This function MAY ONLY be | |
3513 | * called from worker context. It MUST NOT be used while a previous such | |
3514 | * work is still pending! | |
3515 | */ | |
3516 | void drbd_queue_bitmap_io(struct drbd_conf *mdev, | |
3517 | int (*io_fn)(struct drbd_conf *), | |
3518 | void (*done)(struct drbd_conf *, int), | |
3519 | char *why) | |
3520 | { | |
3521 | D_ASSERT(current == mdev->worker.task); | |
3522 | ||
3523 | D_ASSERT(!test_bit(BITMAP_IO_QUEUED, &mdev->flags)); | |
3524 | D_ASSERT(!test_bit(BITMAP_IO, &mdev->flags)); | |
3525 | D_ASSERT(list_empty(&mdev->bm_io_work.w.list)); | |
3526 | if (mdev->bm_io_work.why) | |
3527 | dev_err(DEV, "FIXME going to queue '%s' but '%s' still pending?\n", | |
3528 | why, mdev->bm_io_work.why); | |
3529 | ||
3530 | mdev->bm_io_work.io_fn = io_fn; | |
3531 | mdev->bm_io_work.done = done; | |
3532 | mdev->bm_io_work.why = why; | |
3533 | ||
3534 | set_bit(BITMAP_IO, &mdev->flags); | |
3535 | if (atomic_read(&mdev->ap_bio_cnt) == 0) { | |
3536 | if (list_empty(&mdev->bm_io_work.w.list)) { | |
3537 | set_bit(BITMAP_IO_QUEUED, &mdev->flags); | |
3538 | drbd_queue_work(&mdev->data.work, &mdev->bm_io_work.w); | |
3539 | } else | |
3540 | dev_err(DEV, "FIXME avoided double queuing bm_io_work\n"); | |
3541 | } | |
3542 | } | |
3543 | ||
3544 | /** | |
3545 | * drbd_bitmap_io() - Does an IO operation on the whole bitmap | |
3546 | * @mdev: DRBD device. | |
3547 | * @io_fn: IO callback to be called when bitmap IO is possible | |
3548 | * @why: Descriptive text of the reason for doing the IO | |
3549 | * | |
3550 | * freezes application IO while that the actual IO operations runs. This | |
3551 | * functions MAY NOT be called from worker context. | |
3552 | */ | |
3553 | int drbd_bitmap_io(struct drbd_conf *mdev, int (*io_fn)(struct drbd_conf *), char *why) | |
3554 | { | |
3555 | int rv; | |
3556 | ||
3557 | D_ASSERT(current != mdev->worker.task); | |
3558 | ||
3559 | drbd_suspend_io(mdev); | |
3560 | ||
3561 | drbd_bm_lock(mdev, why); | |
3562 | rv = io_fn(mdev); | |
3563 | drbd_bm_unlock(mdev); | |
3564 | ||
3565 | drbd_resume_io(mdev); | |
3566 | ||
3567 | return rv; | |
3568 | } | |
3569 | ||
3570 | void drbd_md_set_flag(struct drbd_conf *mdev, int flag) __must_hold(local) | |
3571 | { | |
3572 | if ((mdev->ldev->md.flags & flag) != flag) { | |
3573 | drbd_md_mark_dirty(mdev); | |
3574 | mdev->ldev->md.flags |= flag; | |
3575 | } | |
3576 | } | |
3577 | ||
3578 | void drbd_md_clear_flag(struct drbd_conf *mdev, int flag) __must_hold(local) | |
3579 | { | |
3580 | if ((mdev->ldev->md.flags & flag) != 0) { | |
3581 | drbd_md_mark_dirty(mdev); | |
3582 | mdev->ldev->md.flags &= ~flag; | |
3583 | } | |
3584 | } | |
3585 | int drbd_md_test_flag(struct drbd_backing_dev *bdev, int flag) | |
3586 | { | |
3587 | return (bdev->md.flags & flag) != 0; | |
3588 | } | |
3589 | ||
3590 | static void md_sync_timer_fn(unsigned long data) | |
3591 | { | |
3592 | struct drbd_conf *mdev = (struct drbd_conf *) data; | |
3593 | ||
3594 | drbd_queue_work_front(&mdev->data.work, &mdev->md_sync_work); | |
3595 | } | |
3596 | ||
3597 | static int w_md_sync(struct drbd_conf *mdev, struct drbd_work *w, int unused) | |
3598 | { | |
3599 | dev_warn(DEV, "md_sync_timer expired! Worker calls drbd_md_sync().\n"); | |
3600 | drbd_md_sync(mdev); | |
3601 | ||
3602 | return 1; | |
3603 | } | |
3604 | ||
3605 | #ifdef CONFIG_DRBD_FAULT_INJECTION | |
3606 | /* Fault insertion support including random number generator shamelessly | |
3607 | * stolen from kernel/rcutorture.c */ | |
3608 | struct fault_random_state { | |
3609 | unsigned long state; | |
3610 | unsigned long count; | |
3611 | }; | |
3612 | ||
3613 | #define FAULT_RANDOM_MULT 39916801 /* prime */ | |
3614 | #define FAULT_RANDOM_ADD 479001701 /* prime */ | |
3615 | #define FAULT_RANDOM_REFRESH 10000 | |
3616 | ||
3617 | /* | |
3618 | * Crude but fast random-number generator. Uses a linear congruential | |
3619 | * generator, with occasional help from get_random_bytes(). | |
3620 | */ | |
3621 | static unsigned long | |
3622 | _drbd_fault_random(struct fault_random_state *rsp) | |
3623 | { | |
3624 | long refresh; | |
3625 | ||
3626 | if (--rsp->count < 0) { | |
3627 | get_random_bytes(&refresh, sizeof(refresh)); | |
3628 | rsp->state += refresh; | |
3629 | rsp->count = FAULT_RANDOM_REFRESH; | |
3630 | } | |
3631 | rsp->state = rsp->state * FAULT_RANDOM_MULT + FAULT_RANDOM_ADD; | |
3632 | return swahw32(rsp->state); | |
3633 | } | |
3634 | ||
3635 | static char * | |
3636 | _drbd_fault_str(unsigned int type) { | |
3637 | static char *_faults[] = { | |
3638 | [DRBD_FAULT_MD_WR] = "Meta-data write", | |
3639 | [DRBD_FAULT_MD_RD] = "Meta-data read", | |
3640 | [DRBD_FAULT_RS_WR] = "Resync write", | |
3641 | [DRBD_FAULT_RS_RD] = "Resync read", | |
3642 | [DRBD_FAULT_DT_WR] = "Data write", | |
3643 | [DRBD_FAULT_DT_RD] = "Data read", | |
3644 | [DRBD_FAULT_DT_RA] = "Data read ahead", | |
3645 | [DRBD_FAULT_BM_ALLOC] = "BM allocation", | |
3646 | [DRBD_FAULT_AL_EE] = "EE allocation" | |
3647 | }; | |
3648 | ||
3649 | return (type < DRBD_FAULT_MAX) ? _faults[type] : "**Unknown**"; | |
3650 | } | |
3651 | ||
3652 | unsigned int | |
3653 | _drbd_insert_fault(struct drbd_conf *mdev, unsigned int type) | |
3654 | { | |
3655 | static struct fault_random_state rrs = {0, 0}; | |
3656 | ||
3657 | unsigned int ret = ( | |
3658 | (fault_devs == 0 || | |
3659 | ((1 << mdev_to_minor(mdev)) & fault_devs) != 0) && | |
3660 | (((_drbd_fault_random(&rrs) % 100) + 1) <= fault_rate)); | |
3661 | ||
3662 | if (ret) { | |
3663 | fault_count++; | |
3664 | ||
3665 | if (printk_ratelimit()) | |
3666 | dev_warn(DEV, "***Simulating %s failure\n", | |
3667 | _drbd_fault_str(type)); | |
3668 | } | |
3669 | ||
3670 | return ret; | |
3671 | } | |
3672 | #endif | |
3673 | ||
3674 | const char *drbd_buildtag(void) | |
3675 | { | |
3676 | /* DRBD built from external sources has here a reference to the | |
3677 | git hash of the source code. */ | |
3678 | ||
3679 | static char buildtag[38] = "\0uilt-in"; | |
3680 | ||
3681 | if (buildtag[0] == 0) { | |
3682 | #ifdef CONFIG_MODULES | |
3683 | if (THIS_MODULE != NULL) | |
3684 | sprintf(buildtag, "srcversion: %-24s", THIS_MODULE->srcversion); | |
3685 | else | |
3686 | #endif | |
3687 | buildtag[0] = 'b'; | |
3688 | } | |
3689 | ||
3690 | return buildtag; | |
3691 | } | |
3692 | ||
3693 | module_init(drbd_init) | |
3694 | module_exit(drbd_cleanup) | |
3695 | ||
b411b363 PR |
3696 | EXPORT_SYMBOL(drbd_conn_str); |
3697 | EXPORT_SYMBOL(drbd_role_str); | |
3698 | EXPORT_SYMBOL(drbd_disk_str); | |
3699 | EXPORT_SYMBOL(drbd_set_st_err_str); |