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x86, numa: Reduce minimum fake node size to 32M
[linux/fpc-iii.git] / drivers / block / drbd / drbd_nl.c
blob29e5c70e4e26c7f6e35b8bb1bec0b7f65442f3a0
1 /*
2 drbd_nl.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 drbd is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2, or (at your option)
13 any later version.
14
15 drbd is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with drbd; see the file COPYING. If not, write to
22 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
23
24 */
25
26 #include <linux/module.h>
27 #include <linux/drbd.h>
28 #include <linux/in.h>
29 #include <linux/fs.h>
30 #include <linux/file.h>
31 #include <linux/slab.h>
32 #include <linux/connector.h>
33 #include <linux/blkpg.h>
34 #include <linux/cpumask.h>
35 #include "drbd_int.h"
36 #include "drbd_req.h"
37 #include "drbd_wrappers.h"
38 #include <asm/unaligned.h>
39 #include <linux/drbd_tag_magic.h>
40 #include <linux/drbd_limits.h>
41 #include <linux/compiler.h>
42 #include <linux/kthread.h>
43
44 static unsigned short *tl_add_blob(unsigned short *, enum drbd_tags, const void *, int);
45 static unsigned short *tl_add_str(unsigned short *, enum drbd_tags, const char *);
46 static unsigned short *tl_add_int(unsigned short *, enum drbd_tags, const void *);
47
48 /* see get_sb_bdev and bd_claim */
49 static char *drbd_m_holder = "Hands off! this is DRBD's meta data device.";
50
51 /* Generate the tag_list to struct functions */
52 #define NL_PACKET(name, number, fields) \
53 static int name ## _from_tags(struct drbd_conf *mdev, \
54 unsigned short *tags, struct name *arg) __attribute__ ((unused)); \
55 static int name ## _from_tags(struct drbd_conf *mdev, \
56 unsigned short *tags, struct name *arg) \
57 { \
58 int tag; \
59 int dlen; \
60 \
61 while ((tag = get_unaligned(tags++)) != TT_END) { \
62 dlen = get_unaligned(tags++); \
63 switch (tag_number(tag)) { \
64 fields \
65 default: \
66 if (tag & T_MANDATORY) { \
67 dev_err(DEV, "Unknown tag: %d\n", tag_number(tag)); \
68 return 0; \
69 } \
70 } \
71 tags = (unsigned short *)((char *)tags + dlen); \
72 } \
73 return 1; \
74 }
75 #define NL_INTEGER(pn, pr, member) \
76 case pn: /* D_ASSERT( tag_type(tag) == TT_INTEGER ); */ \
77 arg->member = get_unaligned((int *)(tags)); \
78 break;
79 #define NL_INT64(pn, pr, member) \
80 case pn: /* D_ASSERT( tag_type(tag) == TT_INT64 ); */ \
81 arg->member = get_unaligned((u64 *)(tags)); \
82 break;
83 #define NL_BIT(pn, pr, member) \
84 case pn: /* D_ASSERT( tag_type(tag) == TT_BIT ); */ \
85 arg->member = *(char *)(tags) ? 1 : 0; \
86 break;
87 #define NL_STRING(pn, pr, member, len) \
88 case pn: /* D_ASSERT( tag_type(tag) == TT_STRING ); */ \
89 if (dlen > len) { \
90 dev_err(DEV, "arg too long: %s (%u wanted, max len: %u bytes)\n", \
91 #member, dlen, (unsigned int)len); \
92 return 0; \
93 } \
94 arg->member ## _len = dlen; \
95 memcpy(arg->member, tags, min_t(size_t, dlen, len)); \
96 break;
97 #include "linux/drbd_nl.h"
98
99 /* Generate the struct to tag_list functions */
100 #define NL_PACKET(name, number, fields) \
101 static unsigned short* \
102 name ## _to_tags(struct drbd_conf *mdev, \
103 struct name *arg, unsigned short *tags) __attribute__ ((unused)); \
104 static unsigned short* \
105 name ## _to_tags(struct drbd_conf *mdev, \
106 struct name *arg, unsigned short *tags) \
107 { \
108 fields \
109 return tags; \
110 }
111
112 #define NL_INTEGER(pn, pr, member) \
113 put_unaligned(pn | pr | TT_INTEGER, tags++); \
114 put_unaligned(sizeof(int), tags++); \
115 put_unaligned(arg->member, (int *)tags); \
116 tags = (unsigned short *)((char *)tags+sizeof(int));
117 #define NL_INT64(pn, pr, member) \
118 put_unaligned(pn | pr | TT_INT64, tags++); \
119 put_unaligned(sizeof(u64), tags++); \
120 put_unaligned(arg->member, (u64 *)tags); \
121 tags = (unsigned short *)((char *)tags+sizeof(u64));
122 #define NL_BIT(pn, pr, member) \
123 put_unaligned(pn | pr | TT_BIT, tags++); \
124 put_unaligned(sizeof(char), tags++); \
125 *(char *)tags = arg->member; \
126 tags = (unsigned short *)((char *)tags+sizeof(char));
127 #define NL_STRING(pn, pr, member, len) \
128 put_unaligned(pn | pr | TT_STRING, tags++); \
129 put_unaligned(arg->member ## _len, tags++); \
130 memcpy(tags, arg->member, arg->member ## _len); \
131 tags = (unsigned short *)((char *)tags + arg->member ## _len);
132 #include "linux/drbd_nl.h"
133
134 void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name);
135 void drbd_nl_send_reply(struct cn_msg *, int);
136
137 int drbd_khelper(struct drbd_conf *mdev, char *cmd)
138 {
139 char *envp[] = { "HOME=/",
140 "TERM=linux",
141 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
142 NULL, /* Will be set to address family */
143 NULL, /* Will be set to address */
144 NULL };
145
146 char mb[12], af[20], ad[60], *afs;
147 char *argv[] = {usermode_helper, cmd, mb, NULL };
148 int ret;
149
150 snprintf(mb, 12, "minor-%d", mdev_to_minor(mdev));
151
152 if (get_net_conf(mdev)) {
153 switch (((struct sockaddr *)mdev->net_conf->peer_addr)->sa_family) {
154 case AF_INET6:
155 afs = "ipv6";
156 snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI6",
157 &((struct sockaddr_in6 *)mdev->net_conf->peer_addr)->sin6_addr);
158 break;
159 case AF_INET:
160 afs = "ipv4";
161 snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4",
162 &((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr);
163 break;
164 default:
165 afs = "ssocks";
166 snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4",
167 &((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr);
168 }
169 snprintf(af, 20, "DRBD_PEER_AF=%s", afs);
170 envp[3]=af;
171 envp[4]=ad;
172 put_net_conf(mdev);
173 }
174
175 /* The helper may take some time.
176 * write out any unsynced meta data changes now */
177 drbd_md_sync(mdev);
178
179 dev_info(DEV, "helper command: %s %s %s\n", usermode_helper, cmd, mb);
180
181 drbd_bcast_ev_helper(mdev, cmd);
182 ret = call_usermodehelper(usermode_helper, argv, envp, 1);
183 if (ret)
184 dev_warn(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
185 usermode_helper, cmd, mb,
186 (ret >> 8) & 0xff, ret);
187 else
188 dev_info(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
189 usermode_helper, cmd, mb,
190 (ret >> 8) & 0xff, ret);
191
192 if (ret < 0) /* Ignore any ERRNOs we got. */
193 ret = 0;
194
195 return ret;
196 }
197
198 enum drbd_disk_state drbd_try_outdate_peer(struct drbd_conf *mdev)
199 {
200 char *ex_to_string;
201 int r;
202 enum drbd_disk_state nps;
203 enum drbd_fencing_p fp;
204
205 D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
206
207 if (get_ldev_if_state(mdev, D_CONSISTENT)) {
208 fp = mdev->ldev->dc.fencing;
209 put_ldev(mdev);
210 } else {
211 dev_warn(DEV, "Not fencing peer, I'm not even Consistent myself.\n");
212 nps = mdev->state.pdsk;
213 goto out;
214 }
215
216 r = drbd_khelper(mdev, "fence-peer");
217
218 switch ((r>>8) & 0xff) {
219 case 3: /* peer is inconsistent */
220 ex_to_string = "peer is inconsistent or worse";
221 nps = D_INCONSISTENT;
222 break;
223 case 4: /* peer got outdated, or was already outdated */
224 ex_to_string = "peer was fenced";
225 nps = D_OUTDATED;
226 break;
227 case 5: /* peer was down */
228 if (mdev->state.disk == D_UP_TO_DATE) {
229 /* we will(have) create(d) a new UUID anyways... */
230 ex_to_string = "peer is unreachable, assumed to be dead";
231 nps = D_OUTDATED;
232 } else {
233 ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
234 nps = mdev->state.pdsk;
235 }
236 break;
237 case 6: /* Peer is primary, voluntarily outdate myself.
238 * This is useful when an unconnected R_SECONDARY is asked to
239 * become R_PRIMARY, but finds the other peer being active. */
240 ex_to_string = "peer is active";
241 dev_warn(DEV, "Peer is primary, outdating myself.\n");
242 nps = D_UNKNOWN;
243 _drbd_request_state(mdev, NS(disk, D_OUTDATED), CS_WAIT_COMPLETE);
244 break;
245 case 7:
246 if (fp != FP_STONITH)
247 dev_err(DEV, "fence-peer() = 7 && fencing != Stonith !!!\n");
248 ex_to_string = "peer was stonithed";
249 nps = D_OUTDATED;
250 break;
251 default:
252 /* The script is broken ... */
253 nps = D_UNKNOWN;
254 dev_err(DEV, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
255 return nps;
256 }
257
258 dev_info(DEV, "fence-peer helper returned %d (%s)\n",
259 (r>>8) & 0xff, ex_to_string);
260
261 out:
262 if (mdev->state.susp_fen && nps >= D_UNKNOWN) {
263 /* The handler was not successful... unfreeze here, the
264 state engine can not unfreeze... */
265 _drbd_request_state(mdev, NS(susp_fen, 0), CS_VERBOSE);
266 }
267
268 return nps;
269 }
270
271 static int _try_outdate_peer_async(void *data)
272 {
273 struct drbd_conf *mdev = (struct drbd_conf *)data;
274 enum drbd_disk_state nps;
275
276 nps = drbd_try_outdate_peer(mdev);
277 drbd_request_state(mdev, NS(pdsk, nps));
278
279 return 0;
280 }
281
282 void drbd_try_outdate_peer_async(struct drbd_conf *mdev)
283 {
284 struct task_struct *opa;
285
286 opa = kthread_run(_try_outdate_peer_async, mdev, "drbd%d_a_helper", mdev_to_minor(mdev));
287 if (IS_ERR(opa))
288 dev_err(DEV, "out of mem, failed to invoke fence-peer helper\n");
289 }
290
291 int drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
292 {
293 const int max_tries = 4;
294 int r = 0;
295 int try = 0;
296 int forced = 0;
297 union drbd_state mask, val;
298 enum drbd_disk_state nps;
299
300 if (new_role == R_PRIMARY)
301 request_ping(mdev); /* Detect a dead peer ASAP */
302
303 mutex_lock(&mdev->state_mutex);
304
305 mask.i = 0; mask.role = R_MASK;
306 val.i = 0; val.role = new_role;
307
308 while (try++ < max_tries) {
309 r = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE);
310
311 /* in case we first succeeded to outdate,
312 * but now suddenly could establish a connection */
313 if (r == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
314 val.pdsk = 0;
315 mask.pdsk = 0;
316 continue;
317 }
318
319 if (r == SS_NO_UP_TO_DATE_DISK && force &&
320 (mdev->state.disk < D_UP_TO_DATE &&
321 mdev->state.disk >= D_INCONSISTENT)) {
322 mask.disk = D_MASK;
323 val.disk = D_UP_TO_DATE;
324 forced = 1;
325 continue;
326 }
327
328 if (r == SS_NO_UP_TO_DATE_DISK &&
329 mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) {
330 D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
331 nps = drbd_try_outdate_peer(mdev);
332
333 if (nps == D_OUTDATED || nps == D_INCONSISTENT) {
334 val.disk = D_UP_TO_DATE;
335 mask.disk = D_MASK;
336 }
337
338 val.pdsk = nps;
339 mask.pdsk = D_MASK;
340
341 continue;
342 }
343
344 if (r == SS_NOTHING_TO_DO)
345 goto fail;
346 if (r == SS_PRIMARY_NOP && mask.pdsk == 0) {
347 nps = drbd_try_outdate_peer(mdev);
348
349 if (force && nps > D_OUTDATED) {
350 dev_warn(DEV, "Forced into split brain situation!\n");
351 nps = D_OUTDATED;
352 }
353
354 mask.pdsk = D_MASK;
355 val.pdsk = nps;
356
357 continue;
358 }
359 if (r == SS_TWO_PRIMARIES) {
360 /* Maybe the peer is detected as dead very soon...
361 retry at most once more in this case. */
362 __set_current_state(TASK_INTERRUPTIBLE);
363 schedule_timeout((mdev->net_conf->ping_timeo+1)*HZ/10);
364 if (try < max_tries)
365 try = max_tries - 1;
366 continue;
367 }
368 if (r < SS_SUCCESS) {
369 r = _drbd_request_state(mdev, mask, val,
370 CS_VERBOSE + CS_WAIT_COMPLETE);
371 if (r < SS_SUCCESS)
372 goto fail;
373 }
374 break;
375 }
376
377 if (r < SS_SUCCESS)
378 goto fail;
379
380 if (forced)
381 dev_warn(DEV, "Forced to consider local data as UpToDate!\n");
382
383 /* Wait until nothing is on the fly :) */
384 wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0);
385
386 if (new_role == R_SECONDARY) {
387 set_disk_ro(mdev->vdisk, TRUE);
388 if (get_ldev(mdev)) {
389 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
390 put_ldev(mdev);
391 }
392 } else {
393 if (get_net_conf(mdev)) {
394 mdev->net_conf->want_lose = 0;
395 put_net_conf(mdev);
396 }
397 set_disk_ro(mdev->vdisk, FALSE);
398 if (get_ldev(mdev)) {
399 if (((mdev->state.conn < C_CONNECTED ||
400 mdev->state.pdsk <= D_FAILED)
401 && mdev->ldev->md.uuid[UI_BITMAP] == 0) || forced)
402 drbd_uuid_new_current(mdev);
403
404 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
405 put_ldev(mdev);
406 }
407 }
408
409 if ((new_role == R_SECONDARY) && get_ldev(mdev)) {
410 drbd_al_to_on_disk_bm(mdev);
411 put_ldev(mdev);
412 }
413
414 if (mdev->state.conn >= C_WF_REPORT_PARAMS) {
415 /* if this was forced, we should consider sync */
416 if (forced)
417 drbd_send_uuids(mdev);
418 drbd_send_state(mdev);
419 }
420
421 drbd_md_sync(mdev);
422
423 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
424 fail:
425 mutex_unlock(&mdev->state_mutex);
426 return r;
427 }
428
429 static struct drbd_conf *ensure_mdev(int minor, int create)
430 {
431 struct drbd_conf *mdev;
432
433 if (minor >= minor_count)
434 return NULL;
435
436 mdev = minor_to_mdev(minor);
437
438 if (!mdev && create) {
439 struct gendisk *disk = NULL;
440 mdev = drbd_new_device(minor);
441
442 spin_lock_irq(&drbd_pp_lock);
443 if (minor_table[minor] == NULL) {
444 minor_table[minor] = mdev;
445 disk = mdev->vdisk;
446 mdev = NULL;
447 } /* else: we lost the race */
448 spin_unlock_irq(&drbd_pp_lock);
449
450 if (disk) /* we won the race above */
451 /* in case we ever add a drbd_delete_device(),
452 * don't forget the del_gendisk! */
453 add_disk(disk);
454 else /* we lost the race above */
455 drbd_free_mdev(mdev);
456
457 mdev = minor_to_mdev(minor);
458 }
459
460 return mdev;
461 }
462
463 static int drbd_nl_primary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
464 struct drbd_nl_cfg_reply *reply)
465 {
466 struct primary primary_args;
467
468 memset(&primary_args, 0, sizeof(struct primary));
469 if (!primary_from_tags(mdev, nlp->tag_list, &primary_args)) {
470 reply->ret_code = ERR_MANDATORY_TAG;
471 return 0;
472 }
473
474 reply->ret_code =
475 drbd_set_role(mdev, R_PRIMARY, primary_args.primary_force);
476
477 return 0;
478 }
479
480 static int drbd_nl_secondary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
481 struct drbd_nl_cfg_reply *reply)
482 {
483 reply->ret_code = drbd_set_role(mdev, R_SECONDARY, 0);
484
485 return 0;
486 }
487
488 /* initializes the md.*_offset members, so we are able to find
489 * the on disk meta data */
490 static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
491 struct drbd_backing_dev *bdev)
492 {
493 sector_t md_size_sect = 0;
494 switch (bdev->dc.meta_dev_idx) {
495 default:
496 /* v07 style fixed size indexed meta data */
497 bdev->md.md_size_sect = MD_RESERVED_SECT;
498 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
499 bdev->md.al_offset = MD_AL_OFFSET;
500 bdev->md.bm_offset = MD_BM_OFFSET;
501 break;
502 case DRBD_MD_INDEX_FLEX_EXT:
503 /* just occupy the full device; unit: sectors */
504 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
505 bdev->md.md_offset = 0;
506 bdev->md.al_offset = MD_AL_OFFSET;
507 bdev->md.bm_offset = MD_BM_OFFSET;
508 break;
509 case DRBD_MD_INDEX_INTERNAL:
510 case DRBD_MD_INDEX_FLEX_INT:
511 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
512 /* al size is still fixed */
513 bdev->md.al_offset = -MD_AL_MAX_SIZE;
514 /* we need (slightly less than) ~ this much bitmap sectors: */
515 md_size_sect = drbd_get_capacity(bdev->backing_bdev);
516 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
517 md_size_sect = BM_SECT_TO_EXT(md_size_sect);
518 md_size_sect = ALIGN(md_size_sect, 8);
519
520 /* plus the "drbd meta data super block",
521 * and the activity log; */
522 md_size_sect += MD_BM_OFFSET;
523
524 bdev->md.md_size_sect = md_size_sect;
525 /* bitmap offset is adjusted by 'super' block size */
526 bdev->md.bm_offset = -md_size_sect + MD_AL_OFFSET;
527 break;
528 }
529 }
530
531 char *ppsize(char *buf, unsigned long long size)
532 {
533 /* Needs 9 bytes at max. */
534 static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
535 int base = 0;
536 while (size >= 10000) {
537 /* shift + round */
538 size = (size >> 10) + !!(size & (1<<9));
539 base++;
540 }
541 sprintf(buf, "%lu %cB", (long)size, units[base]);
542
543 return buf;
544 }
545
546 /* there is still a theoretical deadlock when called from receiver
547 * on an D_INCONSISTENT R_PRIMARY:
548 * remote READ does inc_ap_bio, receiver would need to receive answer
549 * packet from remote to dec_ap_bio again.
550 * receiver receive_sizes(), comes here,
551 * waits for ap_bio_cnt == 0. -> deadlock.
552 * but this cannot happen, actually, because:
553 * R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable
554 * (not connected, or bad/no disk on peer):
555 * see drbd_fail_request_early, ap_bio_cnt is zero.
556 * R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET:
557 * peer may not initiate a resize.
558 */
559 void drbd_suspend_io(struct drbd_conf *mdev)
560 {
561 set_bit(SUSPEND_IO, &mdev->flags);
562 if (is_susp(mdev->state))
563 return;
564 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
565 }
566
567 void drbd_resume_io(struct drbd_conf *mdev)
568 {
569 clear_bit(SUSPEND_IO, &mdev->flags);
570 wake_up(&mdev->misc_wait);
571 }
572
573 /**
574 * drbd_determine_dev_size() - Sets the right device size obeying all constraints
575 * @mdev: DRBD device.
576 *
577 * Returns 0 on success, negative return values indicate errors.
578 * You should call drbd_md_sync() after calling this function.
579 */
580 enum determine_dev_size drbd_determin_dev_size(struct drbd_conf *mdev, enum dds_flags flags) __must_hold(local)
581 {
582 sector_t prev_first_sect, prev_size; /* previous meta location */
583 sector_t la_size;
584 sector_t size;
585 char ppb[10];
586
587 int md_moved, la_size_changed;
588 enum determine_dev_size rv = unchanged;
589
590 /* race:
591 * application request passes inc_ap_bio,
592 * but then cannot get an AL-reference.
593 * this function later may wait on ap_bio_cnt == 0. -> deadlock.
594 *
595 * to avoid that:
596 * Suspend IO right here.
597 * still lock the act_log to not trigger ASSERTs there.
598 */
599 drbd_suspend_io(mdev);
600
601 /* no wait necessary anymore, actually we could assert that */
602 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
603
604 prev_first_sect = drbd_md_first_sector(mdev->ldev);
605 prev_size = mdev->ldev->md.md_size_sect;
606 la_size = mdev->ldev->md.la_size_sect;
607
608 /* TODO: should only be some assert here, not (re)init... */
609 drbd_md_set_sector_offsets(mdev, mdev->ldev);
610
611 size = drbd_new_dev_size(mdev, mdev->ldev, flags & DDSF_FORCED);
612
613 if (drbd_get_capacity(mdev->this_bdev) != size ||
614 drbd_bm_capacity(mdev) != size) {
615 int err;
616 err = drbd_bm_resize(mdev, size, !(flags & DDSF_NO_RESYNC));
617 if (unlikely(err)) {
618 /* currently there is only one error: ENOMEM! */
619 size = drbd_bm_capacity(mdev)>>1;
620 if (size == 0) {
621 dev_err(DEV, "OUT OF MEMORY! "
622 "Could not allocate bitmap!\n");
623 } else {
624 dev_err(DEV, "BM resizing failed. "
625 "Leaving size unchanged at size = %lu KB\n",
626 (unsigned long)size);
627 }
628 rv = dev_size_error;
629 }
630 /* racy, see comments above. */
631 drbd_set_my_capacity(mdev, size);
632 mdev->ldev->md.la_size_sect = size;
633 dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1),
634 (unsigned long long)size>>1);
635 }
636 if (rv == dev_size_error)
637 goto out;
638
639 la_size_changed = (la_size != mdev->ldev->md.la_size_sect);
640
641 md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev)
642 || prev_size != mdev->ldev->md.md_size_sect;
643
644 if (la_size_changed || md_moved) {
645 drbd_al_shrink(mdev); /* All extents inactive. */
646 dev_info(DEV, "Writing the whole bitmap, %s\n",
647 la_size_changed && md_moved ? "size changed and md moved" :
648 la_size_changed ? "size changed" : "md moved");
649 rv = drbd_bitmap_io(mdev, &drbd_bm_write, "size changed"); /* does drbd_resume_io() ! */
650 drbd_md_mark_dirty(mdev);
651 }
652
653 if (size > la_size)
654 rv = grew;
655 if (size < la_size)
656 rv = shrunk;
657 out:
658 lc_unlock(mdev->act_log);
659 wake_up(&mdev->al_wait);
660 drbd_resume_io(mdev);
661
662 return rv;
663 }
664
665 sector_t
666 drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev, int assume_peer_has_space)
667 {
668 sector_t p_size = mdev->p_size; /* partner's disk size. */
669 sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */
670 sector_t m_size; /* my size */
671 sector_t u_size = bdev->dc.disk_size; /* size requested by user. */
672 sector_t size = 0;
673
674 m_size = drbd_get_max_capacity(bdev);
675
676 if (mdev->state.conn < C_CONNECTED && assume_peer_has_space) {
677 dev_warn(DEV, "Resize while not connected was forced by the user!\n");
678 p_size = m_size;
679 }
680
681 if (p_size && m_size) {
682 size = min_t(sector_t, p_size, m_size);
683 } else {
684 if (la_size) {
685 size = la_size;
686 if (m_size && m_size < size)
687 size = m_size;
688 if (p_size && p_size < size)
689 size = p_size;
690 } else {
691 if (m_size)
692 size = m_size;
693 if (p_size)
694 size = p_size;
695 }
696 }
697
698 if (size == 0)
699 dev_err(DEV, "Both nodes diskless!\n");
700
701 if (u_size) {
702 if (u_size > size)
703 dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n",
704 (unsigned long)u_size>>1, (unsigned long)size>>1);
705 else
706 size = u_size;
707 }
708
709 return size;
710 }
711
712 /**
713 * drbd_check_al_size() - Ensures that the AL is of the right size
714 * @mdev: DRBD device.
715 *
716 * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
717 * failed, and 0 on success. You should call drbd_md_sync() after you called
718 * this function.
719 */
720 static int drbd_check_al_size(struct drbd_conf *mdev)
721 {
722 struct lru_cache *n, *t;
723 struct lc_element *e;
724 unsigned int in_use;
725 int i;
726
727 ERR_IF(mdev->sync_conf.al_extents < 7)
728 mdev->sync_conf.al_extents = 127;
729
730 if (mdev->act_log &&
731 mdev->act_log->nr_elements == mdev->sync_conf.al_extents)
732 return 0;
733
734 in_use = 0;
735 t = mdev->act_log;
736 n = lc_create("act_log", drbd_al_ext_cache,
737 mdev->sync_conf.al_extents, sizeof(struct lc_element), 0);
738
739 if (n == NULL) {
740 dev_err(DEV, "Cannot allocate act_log lru!\n");
741 return -ENOMEM;
742 }
743 spin_lock_irq(&mdev->al_lock);
744 if (t) {
745 for (i = 0; i < t->nr_elements; i++) {
746 e = lc_element_by_index(t, i);
747 if (e->refcnt)
748 dev_err(DEV, "refcnt(%d)==%d\n",
749 e->lc_number, e->refcnt);
750 in_use += e->refcnt;
751 }
752 }
753 if (!in_use)
754 mdev->act_log = n;
755 spin_unlock_irq(&mdev->al_lock);
756 if (in_use) {
757 dev_err(DEV, "Activity log still in use!\n");
758 lc_destroy(n);
759 return -EBUSY;
760 } else {
761 if (t)
762 lc_destroy(t);
763 }
764 drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */
765 return 0;
766 }
767
768 void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_seg_s) __must_hold(local)
769 {
770 struct request_queue * const q = mdev->rq_queue;
771 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
772 int max_segments = mdev->ldev->dc.max_bio_bvecs;
773
774 max_seg_s = min(queue_max_sectors(b) * queue_logical_block_size(b), max_seg_s);
775
776 blk_queue_max_hw_sectors(q, max_seg_s >> 9);
777 blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
778 blk_queue_max_segment_size(q, max_seg_s);
779 blk_queue_logical_block_size(q, 512);
780 blk_queue_segment_boundary(q, PAGE_SIZE-1);
781 blk_stack_limits(&q->limits, &b->limits, 0);
782
783 dev_info(DEV, "max_segment_size ( = BIO size ) = %u\n", queue_max_segment_size(q));
784
785 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
786 dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
787 q->backing_dev_info.ra_pages,
788 b->backing_dev_info.ra_pages);
789 q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
790 }
791 }
792
793 /* serialize deconfig (worker exiting, doing cleanup)
794 * and reconfig (drbdsetup disk, drbdsetup net)
795 *
796 * Wait for a potentially exiting worker, then restart it,
797 * or start a new one. Flush any pending work, there may still be an
798 * after_state_change queued.
799 */
800 static void drbd_reconfig_start(struct drbd_conf *mdev)
801 {
802 wait_event(mdev->state_wait, !test_and_set_bit(CONFIG_PENDING, &mdev->flags));
803 wait_event(mdev->state_wait, !test_bit(DEVICE_DYING, &mdev->flags));
804 drbd_thread_start(&mdev->worker);
805 drbd_flush_workqueue(mdev);
806 }
807
808 /* if still unconfigured, stops worker again.
809 * if configured now, clears CONFIG_PENDING.
810 * wakes potential waiters */
811 static void drbd_reconfig_done(struct drbd_conf *mdev)
812 {
813 spin_lock_irq(&mdev->req_lock);
814 if (mdev->state.disk == D_DISKLESS &&
815 mdev->state.conn == C_STANDALONE &&
816 mdev->state.role == R_SECONDARY) {
817 set_bit(DEVICE_DYING, &mdev->flags);
818 drbd_thread_stop_nowait(&mdev->worker);
819 } else
820 clear_bit(CONFIG_PENDING, &mdev->flags);
821 spin_unlock_irq(&mdev->req_lock);
822 wake_up(&mdev->state_wait);
823 }
824
825 /* Make sure IO is suspended before calling this function(). */
826 static void drbd_suspend_al(struct drbd_conf *mdev)
827 {
828 int s = 0;
829
830 if (lc_try_lock(mdev->act_log)) {
831 drbd_al_shrink(mdev);
832 lc_unlock(mdev->act_log);
833 } else {
834 dev_warn(DEV, "Failed to lock al in drbd_suspend_al()\n");
835 return;
836 }
837
838 spin_lock_irq(&mdev->req_lock);
839 if (mdev->state.conn < C_CONNECTED)
840 s = !test_and_set_bit(AL_SUSPENDED, &mdev->flags);
841
842 spin_unlock_irq(&mdev->req_lock);
843
844 if (s)
845 dev_info(DEV, "Suspended AL updates\n");
846 }
847
848 /* does always return 0;
849 * interesting return code is in reply->ret_code */
850 static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
851 struct drbd_nl_cfg_reply *reply)
852 {
853 enum drbd_ret_codes retcode;
854 enum determine_dev_size dd;
855 sector_t max_possible_sectors;
856 sector_t min_md_device_sectors;
857 struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
858 struct inode *inode, *inode2;
859 struct lru_cache *resync_lru = NULL;
860 union drbd_state ns, os;
861 unsigned int max_seg_s;
862 int rv;
863 int cp_discovered = 0;
864 int logical_block_size;
865
866 drbd_reconfig_start(mdev);
867
868 /* if you want to reconfigure, please tear down first */
869 if (mdev->state.disk > D_DISKLESS) {
870 retcode = ERR_DISK_CONFIGURED;
871 goto fail;
872 }
873 /* It may just now have detached because of IO error. Make sure
874 * drbd_ldev_destroy is done already, we may end up here very fast,
875 * e.g. if someone calls attach from the on-io-error handler,
876 * to realize a "hot spare" feature (not that I'd recommend that) */
877 wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt));
878
879 /* allocation not in the IO path, cqueue thread context */
880 nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
881 if (!nbc) {
882 retcode = ERR_NOMEM;
883 goto fail;
884 }
885
886 nbc->dc.disk_size = DRBD_DISK_SIZE_SECT_DEF;
887 nbc->dc.on_io_error = DRBD_ON_IO_ERROR_DEF;
888 nbc->dc.fencing = DRBD_FENCING_DEF;
889 nbc->dc.max_bio_bvecs = DRBD_MAX_BIO_BVECS_DEF;
890
891 if (!disk_conf_from_tags(mdev, nlp->tag_list, &nbc->dc)) {
892 retcode = ERR_MANDATORY_TAG;
893 goto fail;
894 }
895
896 if (nbc->dc.meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
897 retcode = ERR_MD_IDX_INVALID;
898 goto fail;
899 }
900
901 if (get_net_conf(mdev)) {
902 int prot = mdev->net_conf->wire_protocol;
903 put_net_conf(mdev);
904 if (nbc->dc.fencing == FP_STONITH && prot == DRBD_PROT_A) {
905 retcode = ERR_STONITH_AND_PROT_A;
906 goto fail;
907 }
908 }
909
910 nbc->lo_file = filp_open(nbc->dc.backing_dev, O_RDWR, 0);
911 if (IS_ERR(nbc->lo_file)) {
912 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev,
913 PTR_ERR(nbc->lo_file));
914 nbc->lo_file = NULL;
915 retcode = ERR_OPEN_DISK;
916 goto fail;
917 }
918
919 inode = nbc->lo_file->f_dentry->d_inode;
920
921 if (!S_ISBLK(inode->i_mode)) {
922 retcode = ERR_DISK_NOT_BDEV;
923 goto fail;
924 }
925
926 nbc->md_file = filp_open(nbc->dc.meta_dev, O_RDWR, 0);
927 if (IS_ERR(nbc->md_file)) {
928 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev,
929 PTR_ERR(nbc->md_file));
930 nbc->md_file = NULL;
931 retcode = ERR_OPEN_MD_DISK;
932 goto fail;
933 }
934
935 inode2 = nbc->md_file->f_dentry->d_inode;
936
937 if (!S_ISBLK(inode2->i_mode)) {
938 retcode = ERR_MD_NOT_BDEV;
939 goto fail;
940 }
941
942 nbc->backing_bdev = inode->i_bdev;
943 if (bd_claim(nbc->backing_bdev, mdev)) {
944 printk(KERN_ERR "drbd: bd_claim(%p,%p); failed [%p;%p;%u]\n",
945 nbc->backing_bdev, mdev,
946 nbc->backing_bdev->bd_holder,
947 nbc->backing_bdev->bd_contains->bd_holder,
948 nbc->backing_bdev->bd_holders);
949 retcode = ERR_BDCLAIM_DISK;
950 goto fail;
951 }
952
953 resync_lru = lc_create("resync", drbd_bm_ext_cache,
954 61, sizeof(struct bm_extent),
955 offsetof(struct bm_extent, lce));
956 if (!resync_lru) {
957 retcode = ERR_NOMEM;
958 goto release_bdev_fail;
959 }
960
961 /* meta_dev_idx >= 0: external fixed size,
962 * possibly multiple drbd sharing one meta device.
963 * TODO in that case, paranoia check that [md_bdev, meta_dev_idx] is
964 * not yet used by some other drbd minor!
965 * (if you use drbd.conf + drbdadm,
966 * that should check it for you already; but if you don't, or someone
967 * fooled it, we need to double check here) */
968 nbc->md_bdev = inode2->i_bdev;
969 if (bd_claim(nbc->md_bdev, (nbc->dc.meta_dev_idx < 0) ? (void *)mdev
970 : (void *) drbd_m_holder)) {
971 retcode = ERR_BDCLAIM_MD_DISK;
972 goto release_bdev_fail;
973 }
974
975 if ((nbc->backing_bdev == nbc->md_bdev) !=
976 (nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
977 nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
978 retcode = ERR_MD_IDX_INVALID;
979 goto release_bdev2_fail;
980 }
981
982 /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
983 drbd_md_set_sector_offsets(mdev, nbc);
984
985 if (drbd_get_max_capacity(nbc) < nbc->dc.disk_size) {
986 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
987 (unsigned long long) drbd_get_max_capacity(nbc),
988 (unsigned long long) nbc->dc.disk_size);
989 retcode = ERR_DISK_TO_SMALL;
990 goto release_bdev2_fail;
991 }
992
993 if (nbc->dc.meta_dev_idx < 0) {
994 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
995 /* at least one MB, otherwise it does not make sense */
996 min_md_device_sectors = (2<<10);
997 } else {
998 max_possible_sectors = DRBD_MAX_SECTORS;
999 min_md_device_sectors = MD_RESERVED_SECT * (nbc->dc.meta_dev_idx + 1);
1000 }
1001
1002 if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
1003 retcode = ERR_MD_DISK_TO_SMALL;
1004 dev_warn(DEV, "refusing attach: md-device too small, "
1005 "at least %llu sectors needed for this meta-disk type\n",
1006 (unsigned long long) min_md_device_sectors);
1007 goto release_bdev2_fail;
1008 }
1009
1010 /* Make sure the new disk is big enough
1011 * (we may currently be R_PRIMARY with no local disk...) */
1012 if (drbd_get_max_capacity(nbc) <
1013 drbd_get_capacity(mdev->this_bdev)) {
1014 retcode = ERR_DISK_TO_SMALL;
1015 goto release_bdev2_fail;
1016 }
1017
1018 nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
1019
1020 if (nbc->known_size > max_possible_sectors) {
1021 dev_warn(DEV, "==> truncating very big lower level device "
1022 "to currently maximum possible %llu sectors <==\n",
1023 (unsigned long long) max_possible_sectors);
1024 if (nbc->dc.meta_dev_idx >= 0)
1025 dev_warn(DEV, "==>> using internal or flexible "
1026 "meta data may help <<==\n");
1027 }
1028
1029 drbd_suspend_io(mdev);
1030 /* also wait for the last barrier ack. */
1031 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt) || is_susp(mdev->state));
1032 /* and for any other previously queued work */
1033 drbd_flush_workqueue(mdev);
1034
1035 retcode = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
1036 drbd_resume_io(mdev);
1037 if (retcode < SS_SUCCESS)
1038 goto release_bdev2_fail;
1039
1040 if (!get_ldev_if_state(mdev, D_ATTACHING))
1041 goto force_diskless;
1042
1043 drbd_md_set_sector_offsets(mdev, nbc);
1044
1045 /* allocate a second IO page if logical_block_size != 512 */
1046 logical_block_size = bdev_logical_block_size(nbc->md_bdev);
1047 if (logical_block_size == 0)
1048 logical_block_size = MD_SECTOR_SIZE;
1049
1050 if (logical_block_size != MD_SECTOR_SIZE) {
1051 if (!mdev->md_io_tmpp) {
1052 struct page *page = alloc_page(GFP_NOIO);
1053 if (!page)
1054 goto force_diskless_dec;
1055
1056 dev_warn(DEV, "Meta data's bdev logical_block_size = %d != %d\n",
1057 logical_block_size, MD_SECTOR_SIZE);
1058 dev_warn(DEV, "Workaround engaged (has performance impact).\n");
1059
1060 mdev->md_io_tmpp = page;
1061 }
1062 }
1063
1064 if (!mdev->bitmap) {
1065 if (drbd_bm_init(mdev)) {
1066 retcode = ERR_NOMEM;
1067 goto force_diskless_dec;
1068 }
1069 }
1070
1071 retcode = drbd_md_read(mdev, nbc);
1072 if (retcode != NO_ERROR)
1073 goto force_diskless_dec;
1074
1075 if (mdev->state.conn < C_CONNECTED &&
1076 mdev->state.role == R_PRIMARY &&
1077 (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
1078 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
1079 (unsigned long long)mdev->ed_uuid);
1080 retcode = ERR_DATA_NOT_CURRENT;
1081 goto force_diskless_dec;
1082 }
1083
1084 /* Since we are diskless, fix the activity log first... */
1085 if (drbd_check_al_size(mdev)) {
1086 retcode = ERR_NOMEM;
1087 goto force_diskless_dec;
1088 }
1089
1090 /* Prevent shrinking of consistent devices ! */
1091 if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
1092 drbd_new_dev_size(mdev, nbc, 0) < nbc->md.la_size_sect) {
1093 dev_warn(DEV, "refusing to truncate a consistent device\n");
1094 retcode = ERR_DISK_TO_SMALL;
1095 goto force_diskless_dec;
1096 }
1097
1098 if (!drbd_al_read_log(mdev, nbc)) {
1099 retcode = ERR_IO_MD_DISK;
1100 goto force_diskless_dec;
1101 }
1102
1103 /* Reset the "barriers don't work" bits here, then force meta data to
1104 * be written, to ensure we determine if barriers are supported. */
1105 if (nbc->dc.no_md_flush)
1106 set_bit(MD_NO_FUA, &mdev->flags);
1107 else
1108 clear_bit(MD_NO_FUA, &mdev->flags);
1109
1110 /* Point of no return reached.
1111 * Devices and memory are no longer released by error cleanup below.
1112 * now mdev takes over responsibility, and the state engine should
1113 * clean it up somewhere. */
1114 D_ASSERT(mdev->ldev == NULL);
1115 mdev->ldev = nbc;
1116 mdev->resync = resync_lru;
1117 nbc = NULL;
1118 resync_lru = NULL;
1119
1120 mdev->write_ordering = WO_bdev_flush;
1121 drbd_bump_write_ordering(mdev, WO_bdev_flush);
1122
1123 if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
1124 set_bit(CRASHED_PRIMARY, &mdev->flags);
1125 else
1126 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1127
1128 if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1129 !(mdev->state.role == R_PRIMARY && mdev->state.susp_nod)) {
1130 set_bit(CRASHED_PRIMARY, &mdev->flags);
1131 cp_discovered = 1;
1132 }
1133
1134 mdev->send_cnt = 0;
1135 mdev->recv_cnt = 0;
1136 mdev->read_cnt = 0;
1137 mdev->writ_cnt = 0;
1138
1139 max_seg_s = DRBD_MAX_SEGMENT_SIZE;
1140 if (mdev->state.conn == C_CONNECTED) {
1141 /* We are Primary, Connected, and now attach a new local
1142 * backing store. We must not increase the user visible maximum
1143 * bio size on this device to something the peer may not be
1144 * able to handle. */
1145 if (mdev->agreed_pro_version < 94)
1146 max_seg_s = queue_max_segment_size(mdev->rq_queue);
1147 else if (mdev->agreed_pro_version == 94)
1148 max_seg_s = DRBD_MAX_SIZE_H80_PACKET;
1149 /* else: drbd 8.3.9 and later, stay with default */
1150 }
1151
1152 drbd_setup_queue_param(mdev, max_seg_s);
1153
1154 /* If I am currently not R_PRIMARY,
1155 * but meta data primary indicator is set,
1156 * I just now recover from a hard crash,
1157 * and have been R_PRIMARY before that crash.
1158 *
1159 * Now, if I had no connection before that crash
1160 * (have been degraded R_PRIMARY), chances are that
1161 * I won't find my peer now either.
1162 *
1163 * In that case, and _only_ in that case,
1164 * we use the degr-wfc-timeout instead of the default,
1165 * so we can automatically recover from a crash of a
1166 * degraded but active "cluster" after a certain timeout.
1167 */
1168 clear_bit(USE_DEGR_WFC_T, &mdev->flags);
1169 if (mdev->state.role != R_PRIMARY &&
1170 drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1171 !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
1172 set_bit(USE_DEGR_WFC_T, &mdev->flags);
1173
1174 dd = drbd_determin_dev_size(mdev, 0);
1175 if (dd == dev_size_error) {
1176 retcode = ERR_NOMEM_BITMAP;
1177 goto force_diskless_dec;
1178 } else if (dd == grew)
1179 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
1180
1181 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
1182 dev_info(DEV, "Assuming that all blocks are out of sync "
1183 "(aka FullSync)\n");
1184 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from attaching")) {
1185 retcode = ERR_IO_MD_DISK;
1186 goto force_diskless_dec;
1187 }
1188 } else {
1189 if (drbd_bitmap_io(mdev, &drbd_bm_read, "read from attaching") < 0) {
1190 retcode = ERR_IO_MD_DISK;
1191 goto force_diskless_dec;
1192 }
1193 }
1194
1195 if (cp_discovered) {
1196 drbd_al_apply_to_bm(mdev);
1197 drbd_al_to_on_disk_bm(mdev);
1198 }
1199
1200 if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev))
1201 drbd_suspend_al(mdev); /* IO is still suspended here... */
1202
1203 spin_lock_irq(&mdev->req_lock);
1204 os = mdev->state;
1205 ns.i = os.i;
1206 /* If MDF_CONSISTENT is not set go into inconsistent state,
1207 otherwise investigate MDF_WasUpToDate...
1208 If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1209 otherwise into D_CONSISTENT state.
1210 */
1211 if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
1212 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
1213 ns.disk = D_CONSISTENT;
1214 else
1215 ns.disk = D_OUTDATED;
1216 } else {
1217 ns.disk = D_INCONSISTENT;
1218 }
1219
1220 if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
1221 ns.pdsk = D_OUTDATED;
1222
1223 if ( ns.disk == D_CONSISTENT &&
1224 (ns.pdsk == D_OUTDATED || mdev->ldev->dc.fencing == FP_DONT_CARE))
1225 ns.disk = D_UP_TO_DATE;
1226
1227 /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1228 MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1229 this point, because drbd_request_state() modifies these
1230 flags. */
1231
1232 /* In case we are C_CONNECTED postpone any decision on the new disk
1233 state after the negotiation phase. */
1234 if (mdev->state.conn == C_CONNECTED) {
1235 mdev->new_state_tmp.i = ns.i;
1236 ns.i = os.i;
1237 ns.disk = D_NEGOTIATING;
1238
1239 /* We expect to receive up-to-date UUIDs soon.
1240 To avoid a race in receive_state, free p_uuid while
1241 holding req_lock. I.e. atomic with the state change */
1242 kfree(mdev->p_uuid);
1243 mdev->p_uuid = NULL;
1244 }
1245
1246 rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
1247 ns = mdev->state;
1248 spin_unlock_irq(&mdev->req_lock);
1249
1250 if (rv < SS_SUCCESS)
1251 goto force_diskless_dec;
1252
1253 if (mdev->state.role == R_PRIMARY)
1254 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
1255 else
1256 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1257
1258 drbd_md_mark_dirty(mdev);
1259 drbd_md_sync(mdev);
1260
1261 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1262 put_ldev(mdev);
1263 reply->ret_code = retcode;
1264 drbd_reconfig_done(mdev);
1265 return 0;
1266
1267 force_diskless_dec:
1268 put_ldev(mdev);
1269 force_diskless:
1270 drbd_force_state(mdev, NS(disk, D_FAILED));
1271 drbd_md_sync(mdev);
1272 release_bdev2_fail:
1273 if (nbc)
1274 bd_release(nbc->md_bdev);
1275 release_bdev_fail:
1276 if (nbc)
1277 bd_release(nbc->backing_bdev);
1278 fail:
1279 if (nbc) {
1280 if (nbc->lo_file)
1281 fput(nbc->lo_file);
1282 if (nbc->md_file)
1283 fput(nbc->md_file);
1284 kfree(nbc);
1285 }
1286 lc_destroy(resync_lru);
1287
1288 reply->ret_code = retcode;
1289 drbd_reconfig_done(mdev);
1290 return 0;
1291 }
1292
1293 /* Detaching the disk is a process in multiple stages. First we need to lock
1294 * out application IO, in-flight IO, IO stuck in drbd_al_begin_io.
1295 * Then we transition to D_DISKLESS, and wait for put_ldev() to return all
1296 * internal references as well.
1297 * Only then we have finally detached. */
1298 static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1299 struct drbd_nl_cfg_reply *reply)
1300 {
1301 drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */
1302 reply->ret_code = drbd_request_state(mdev, NS(disk, D_DISKLESS));
1303 if (mdev->state.disk == D_DISKLESS)
1304 wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt));
1305 drbd_resume_io(mdev);
1306 return 0;
1307 }
1308
1309 static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1310 struct drbd_nl_cfg_reply *reply)
1311 {
1312 int i, ns;
1313 enum drbd_ret_codes retcode;
1314 struct net_conf *new_conf = NULL;
1315 struct crypto_hash *tfm = NULL;
1316 struct crypto_hash *integrity_w_tfm = NULL;
1317 struct crypto_hash *integrity_r_tfm = NULL;
1318 struct hlist_head *new_tl_hash = NULL;
1319 struct hlist_head *new_ee_hash = NULL;
1320 struct drbd_conf *odev;
1321 char hmac_name[CRYPTO_MAX_ALG_NAME];
1322 void *int_dig_out = NULL;
1323 void *int_dig_in = NULL;
1324 void *int_dig_vv = NULL;
1325 struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr;
1326
1327 drbd_reconfig_start(mdev);
1328
1329 if (mdev->state.conn > C_STANDALONE) {
1330 retcode = ERR_NET_CONFIGURED;
1331 goto fail;
1332 }
1333
1334 /* allocation not in the IO path, cqueue thread context */
1335 new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
1336 if (!new_conf) {
1337 retcode = ERR_NOMEM;
1338 goto fail;
1339 }
1340
1341 new_conf->timeout = DRBD_TIMEOUT_DEF;
1342 new_conf->try_connect_int = DRBD_CONNECT_INT_DEF;
1343 new_conf->ping_int = DRBD_PING_INT_DEF;
1344 new_conf->max_epoch_size = DRBD_MAX_EPOCH_SIZE_DEF;
1345 new_conf->max_buffers = DRBD_MAX_BUFFERS_DEF;
1346 new_conf->unplug_watermark = DRBD_UNPLUG_WATERMARK_DEF;
1347 new_conf->sndbuf_size = DRBD_SNDBUF_SIZE_DEF;
1348 new_conf->rcvbuf_size = DRBD_RCVBUF_SIZE_DEF;
1349 new_conf->ko_count = DRBD_KO_COUNT_DEF;
1350 new_conf->after_sb_0p = DRBD_AFTER_SB_0P_DEF;
1351 new_conf->after_sb_1p = DRBD_AFTER_SB_1P_DEF;
1352 new_conf->after_sb_2p = DRBD_AFTER_SB_2P_DEF;
1353 new_conf->want_lose = 0;
1354 new_conf->two_primaries = 0;
1355 new_conf->wire_protocol = DRBD_PROT_C;
1356 new_conf->ping_timeo = DRBD_PING_TIMEO_DEF;
1357 new_conf->rr_conflict = DRBD_RR_CONFLICT_DEF;
1358
1359 if (!net_conf_from_tags(mdev, nlp->tag_list, new_conf)) {
1360 retcode = ERR_MANDATORY_TAG;
1361 goto fail;
1362 }
1363
1364 if (new_conf->two_primaries
1365 && (new_conf->wire_protocol != DRBD_PROT_C)) {
1366 retcode = ERR_NOT_PROTO_C;
1367 goto fail;
1368 }
1369
1370 if (get_ldev(mdev)) {
1371 enum drbd_fencing_p fp = mdev->ldev->dc.fencing;
1372 put_ldev(mdev);
1373 if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH) {
1374 retcode = ERR_STONITH_AND_PROT_A;
1375 goto fail;
1376 }
1377 }
1378
1379 if (mdev->state.role == R_PRIMARY && new_conf->want_lose) {
1380 retcode = ERR_DISCARD;
1381 goto fail;
1382 }
1383
1384 retcode = NO_ERROR;
1385
1386 new_my_addr = (struct sockaddr *)&new_conf->my_addr;
1387 new_peer_addr = (struct sockaddr *)&new_conf->peer_addr;
1388 for (i = 0; i < minor_count; i++) {
1389 odev = minor_to_mdev(i);
1390 if (!odev || odev == mdev)
1391 continue;
1392 if (get_net_conf(odev)) {
1393 taken_addr = (struct sockaddr *)&odev->net_conf->my_addr;
1394 if (new_conf->my_addr_len == odev->net_conf->my_addr_len &&
1395 !memcmp(new_my_addr, taken_addr, new_conf->my_addr_len))
1396 retcode = ERR_LOCAL_ADDR;
1397
1398 taken_addr = (struct sockaddr *)&odev->net_conf->peer_addr;
1399 if (new_conf->peer_addr_len == odev->net_conf->peer_addr_len &&
1400 !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len))
1401 retcode = ERR_PEER_ADDR;
1402
1403 put_net_conf(odev);
1404 if (retcode != NO_ERROR)
1405 goto fail;
1406 }
1407 }
1408
1409 if (new_conf->cram_hmac_alg[0] != 0) {
1410 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
1411 new_conf->cram_hmac_alg);
1412 tfm = crypto_alloc_hash(hmac_name, 0, CRYPTO_ALG_ASYNC);
1413 if (IS_ERR(tfm)) {
1414 tfm = NULL;
1415 retcode = ERR_AUTH_ALG;
1416 goto fail;
1417 }
1418
1419 if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) {
1420 retcode = ERR_AUTH_ALG_ND;
1421 goto fail;
1422 }
1423 }
1424
1425 if (new_conf->integrity_alg[0]) {
1426 integrity_w_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1427 if (IS_ERR(integrity_w_tfm)) {
1428 integrity_w_tfm = NULL;
1429 retcode=ERR_INTEGRITY_ALG;
1430 goto fail;
1431 }
1432
1433 if (!drbd_crypto_is_hash(crypto_hash_tfm(integrity_w_tfm))) {
1434 retcode=ERR_INTEGRITY_ALG_ND;
1435 goto fail;
1436 }
1437
1438 integrity_r_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1439 if (IS_ERR(integrity_r_tfm)) {
1440 integrity_r_tfm = NULL;
1441 retcode=ERR_INTEGRITY_ALG;
1442 goto fail;
1443 }
1444 }
1445
1446 ns = new_conf->max_epoch_size/8;
1447 if (mdev->tl_hash_s != ns) {
1448 new_tl_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
1449 if (!new_tl_hash) {
1450 retcode = ERR_NOMEM;
1451 goto fail;
1452 }
1453 }
1454
1455 ns = new_conf->max_buffers/8;
1456 if (new_conf->two_primaries && (mdev->ee_hash_s != ns)) {
1457 new_ee_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
1458 if (!new_ee_hash) {
1459 retcode = ERR_NOMEM;
1460 goto fail;
1461 }
1462 }
1463
1464 ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
1465
1466 if (integrity_w_tfm) {
1467 i = crypto_hash_digestsize(integrity_w_tfm);
1468 int_dig_out = kmalloc(i, GFP_KERNEL);
1469 if (!int_dig_out) {
1470 retcode = ERR_NOMEM;
1471 goto fail;
1472 }
1473 int_dig_in = kmalloc(i, GFP_KERNEL);
1474 if (!int_dig_in) {
1475 retcode = ERR_NOMEM;
1476 goto fail;
1477 }
1478 int_dig_vv = kmalloc(i, GFP_KERNEL);
1479 if (!int_dig_vv) {
1480 retcode = ERR_NOMEM;
1481 goto fail;
1482 }
1483 }
1484
1485 if (!mdev->bitmap) {
1486 if(drbd_bm_init(mdev)) {
1487 retcode = ERR_NOMEM;
1488 goto fail;
1489 }
1490 }
1491
1492 drbd_flush_workqueue(mdev);
1493 spin_lock_irq(&mdev->req_lock);
1494 if (mdev->net_conf != NULL) {
1495 retcode = ERR_NET_CONFIGURED;
1496 spin_unlock_irq(&mdev->req_lock);
1497 goto fail;
1498 }
1499 mdev->net_conf = new_conf;
1500
1501 mdev->send_cnt = 0;
1502 mdev->recv_cnt = 0;
1503
1504 if (new_tl_hash) {
1505 kfree(mdev->tl_hash);
1506 mdev->tl_hash_s = mdev->net_conf->max_epoch_size/8;
1507 mdev->tl_hash = new_tl_hash;
1508 }
1509
1510 if (new_ee_hash) {
1511 kfree(mdev->ee_hash);
1512 mdev->ee_hash_s = mdev->net_conf->max_buffers/8;
1513 mdev->ee_hash = new_ee_hash;
1514 }
1515
1516 crypto_free_hash(mdev->cram_hmac_tfm);
1517 mdev->cram_hmac_tfm = tfm;
1518
1519 crypto_free_hash(mdev->integrity_w_tfm);
1520 mdev->integrity_w_tfm = integrity_w_tfm;
1521
1522 crypto_free_hash(mdev->integrity_r_tfm);
1523 mdev->integrity_r_tfm = integrity_r_tfm;
1524
1525 kfree(mdev->int_dig_out);
1526 kfree(mdev->int_dig_in);
1527 kfree(mdev->int_dig_vv);
1528 mdev->int_dig_out=int_dig_out;
1529 mdev->int_dig_in=int_dig_in;
1530 mdev->int_dig_vv=int_dig_vv;
1531 retcode = _drbd_set_state(_NS(mdev, conn, C_UNCONNECTED), CS_VERBOSE, NULL);
1532 spin_unlock_irq(&mdev->req_lock);
1533
1534 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1535 reply->ret_code = retcode;
1536 drbd_reconfig_done(mdev);
1537 return 0;
1538
1539 fail:
1540 kfree(int_dig_out);
1541 kfree(int_dig_in);
1542 kfree(int_dig_vv);
1543 crypto_free_hash(tfm);
1544 crypto_free_hash(integrity_w_tfm);
1545 crypto_free_hash(integrity_r_tfm);
1546 kfree(new_tl_hash);
1547 kfree(new_ee_hash);
1548 kfree(new_conf);
1549
1550 reply->ret_code = retcode;
1551 drbd_reconfig_done(mdev);
1552 return 0;
1553 }
1554
1555 static int drbd_nl_disconnect(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1556 struct drbd_nl_cfg_reply *reply)
1557 {
1558 int retcode;
1559
1560 retcode = _drbd_request_state(mdev, NS(conn, C_DISCONNECTING), CS_ORDERED);
1561
1562 if (retcode == SS_NOTHING_TO_DO)
1563 goto done;
1564 else if (retcode == SS_ALREADY_STANDALONE)
1565 goto done;
1566 else if (retcode == SS_PRIMARY_NOP) {
1567 /* Our statche checking code wants to see the peer outdated. */
1568 retcode = drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
1569 pdsk, D_OUTDATED));
1570 } else if (retcode == SS_CW_FAILED_BY_PEER) {
1571 /* The peer probably wants to see us outdated. */
1572 retcode = _drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
1573 disk, D_OUTDATED),
1574 CS_ORDERED);
1575 if (retcode == SS_IS_DISKLESS || retcode == SS_LOWER_THAN_OUTDATED) {
1576 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
1577 retcode = SS_SUCCESS;
1578 }
1579 }
1580
1581 if (retcode < SS_SUCCESS)
1582 goto fail;
1583
1584 if (wait_event_interruptible(mdev->state_wait,
1585 mdev->state.conn != C_DISCONNECTING)) {
1586 /* Do not test for mdev->state.conn == C_STANDALONE, since
1587 someone else might connect us in the mean time! */
1588 retcode = ERR_INTR;
1589 goto fail;
1590 }
1591
1592 done:
1593 retcode = NO_ERROR;
1594 fail:
1595 drbd_md_sync(mdev);
1596 reply->ret_code = retcode;
1597 return 0;
1598 }
1599
1600 void resync_after_online_grow(struct drbd_conf *mdev)
1601 {
1602 int iass; /* I am sync source */
1603
1604 dev_info(DEV, "Resync of new storage after online grow\n");
1605 if (mdev->state.role != mdev->state.peer)
1606 iass = (mdev->state.role == R_PRIMARY);
1607 else
1608 iass = test_bit(DISCARD_CONCURRENT, &mdev->flags);
1609
1610 if (iass)
1611 drbd_start_resync(mdev, C_SYNC_SOURCE);
1612 else
1613 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
1614 }
1615
1616 static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1617 struct drbd_nl_cfg_reply *reply)
1618 {
1619 struct resize rs;
1620 int retcode = NO_ERROR;
1621 enum determine_dev_size dd;
1622 enum dds_flags ddsf;
1623
1624 memset(&rs, 0, sizeof(struct resize));
1625 if (!resize_from_tags(mdev, nlp->tag_list, &rs)) {
1626 retcode = ERR_MANDATORY_TAG;
1627 goto fail;
1628 }
1629
1630 if (mdev->state.conn > C_CONNECTED) {
1631 retcode = ERR_RESIZE_RESYNC;
1632 goto fail;
1633 }
1634
1635 if (mdev->state.role == R_SECONDARY &&
1636 mdev->state.peer == R_SECONDARY) {
1637 retcode = ERR_NO_PRIMARY;
1638 goto fail;
1639 }
1640
1641 if (!get_ldev(mdev)) {
1642 retcode = ERR_NO_DISK;
1643 goto fail;
1644 }
1645
1646 if (rs.no_resync && mdev->agreed_pro_version < 93) {
1647 retcode = ERR_NEED_APV_93;
1648 goto fail;
1649 }
1650
1651 if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev))
1652 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
1653
1654 mdev->ldev->dc.disk_size = (sector_t)rs.resize_size;
1655 ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
1656 dd = drbd_determin_dev_size(mdev, ddsf);
1657 drbd_md_sync(mdev);
1658 put_ldev(mdev);
1659 if (dd == dev_size_error) {
1660 retcode = ERR_NOMEM_BITMAP;
1661 goto fail;
1662 }
1663
1664 if (mdev->state.conn == C_CONNECTED) {
1665 if (dd == grew)
1666 set_bit(RESIZE_PENDING, &mdev->flags);
1667
1668 drbd_send_uuids(mdev);
1669 drbd_send_sizes(mdev, 1, ddsf);
1670 }
1671
1672 fail:
1673 reply->ret_code = retcode;
1674 return 0;
1675 }
1676
1677 static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1678 struct drbd_nl_cfg_reply *reply)
1679 {
1680 int retcode = NO_ERROR;
1681 int err;
1682 int ovr; /* online verify running */
1683 int rsr; /* re-sync running */
1684 struct crypto_hash *verify_tfm = NULL;
1685 struct crypto_hash *csums_tfm = NULL;
1686 struct syncer_conf sc;
1687 cpumask_var_t new_cpu_mask;
1688 int *rs_plan_s = NULL;
1689 int fifo_size;
1690
1691 if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) {
1692 retcode = ERR_NOMEM;
1693 goto fail;
1694 }
1695
1696 if (nlp->flags & DRBD_NL_SET_DEFAULTS) {
1697 memset(&sc, 0, sizeof(struct syncer_conf));
1698 sc.rate = DRBD_RATE_DEF;
1699 sc.after = DRBD_AFTER_DEF;
1700 sc.al_extents = DRBD_AL_EXTENTS_DEF;
1701 sc.on_no_data = DRBD_ON_NO_DATA_DEF;
1702 sc.c_plan_ahead = DRBD_C_PLAN_AHEAD_DEF;
1703 sc.c_delay_target = DRBD_C_DELAY_TARGET_DEF;
1704 sc.c_fill_target = DRBD_C_FILL_TARGET_DEF;
1705 sc.c_max_rate = DRBD_C_MAX_RATE_DEF;
1706 sc.c_min_rate = DRBD_C_MIN_RATE_DEF;
1707 } else
1708 memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf));
1709
1710 if (!syncer_conf_from_tags(mdev, nlp->tag_list, &sc)) {
1711 retcode = ERR_MANDATORY_TAG;
1712 goto fail;
1713 }
1714
1715 /* re-sync running */
1716 rsr = ( mdev->state.conn == C_SYNC_SOURCE ||
1717 mdev->state.conn == C_SYNC_TARGET ||
1718 mdev->state.conn == C_PAUSED_SYNC_S ||
1719 mdev->state.conn == C_PAUSED_SYNC_T );
1720
1721 if (rsr && strcmp(sc.csums_alg, mdev->sync_conf.csums_alg)) {
1722 retcode = ERR_CSUMS_RESYNC_RUNNING;
1723 goto fail;
1724 }
1725
1726 if (!rsr && sc.csums_alg[0]) {
1727 csums_tfm = crypto_alloc_hash(sc.csums_alg, 0, CRYPTO_ALG_ASYNC);
1728 if (IS_ERR(csums_tfm)) {
1729 csums_tfm = NULL;
1730 retcode = ERR_CSUMS_ALG;
1731 goto fail;
1732 }
1733
1734 if (!drbd_crypto_is_hash(crypto_hash_tfm(csums_tfm))) {
1735 retcode = ERR_CSUMS_ALG_ND;
1736 goto fail;
1737 }
1738 }
1739
1740 /* online verify running */
1741 ovr = (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T);
1742
1743 if (ovr) {
1744 if (strcmp(sc.verify_alg, mdev->sync_conf.verify_alg)) {
1745 retcode = ERR_VERIFY_RUNNING;
1746 goto fail;
1747 }
1748 }
1749
1750 if (!ovr && sc.verify_alg[0]) {
1751 verify_tfm = crypto_alloc_hash(sc.verify_alg, 0, CRYPTO_ALG_ASYNC);
1752 if (IS_ERR(verify_tfm)) {
1753 verify_tfm = NULL;
1754 retcode = ERR_VERIFY_ALG;
1755 goto fail;
1756 }
1757
1758 if (!drbd_crypto_is_hash(crypto_hash_tfm(verify_tfm))) {
1759 retcode = ERR_VERIFY_ALG_ND;
1760 goto fail;
1761 }
1762 }
1763
1764 /* silently ignore cpu mask on UP kernel */
1765 if (nr_cpu_ids > 1 && sc.cpu_mask[0] != 0) {
1766 err = __bitmap_parse(sc.cpu_mask, 32, 0,
1767 cpumask_bits(new_cpu_mask), nr_cpu_ids);
1768 if (err) {
1769 dev_warn(DEV, "__bitmap_parse() failed with %d\n", err);
1770 retcode = ERR_CPU_MASK_PARSE;
1771 goto fail;
1772 }
1773 }
1774
1775 ERR_IF (sc.rate < 1) sc.rate = 1;
1776 ERR_IF (sc.al_extents < 7) sc.al_extents = 127; /* arbitrary minimum */
1777 #define AL_MAX ((MD_AL_MAX_SIZE-1) * AL_EXTENTS_PT)
1778 if (sc.al_extents > AL_MAX) {
1779 dev_err(DEV, "sc.al_extents > %d\n", AL_MAX);
1780 sc.al_extents = AL_MAX;
1781 }
1782 #undef AL_MAX
1783
1784 /* to avoid spurious errors when configuring minors before configuring
1785 * the minors they depend on: if necessary, first create the minor we
1786 * depend on */
1787 if (sc.after >= 0)
1788 ensure_mdev(sc.after, 1);
1789
1790 /* most sanity checks done, try to assign the new sync-after
1791 * dependency. need to hold the global lock in there,
1792 * to avoid a race in the dependency loop check. */
1793 retcode = drbd_alter_sa(mdev, sc.after);
1794 if (retcode != NO_ERROR)
1795 goto fail;
1796
1797 fifo_size = (sc.c_plan_ahead * 10 * SLEEP_TIME) / HZ;
1798 if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) {
1799 rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL);
1800 if (!rs_plan_s) {
1801 dev_err(DEV, "kmalloc of fifo_buffer failed");
1802 retcode = ERR_NOMEM;
1803 goto fail;
1804 }
1805 }
1806
1807 /* ok, assign the rest of it as well.
1808 * lock against receive_SyncParam() */
1809 spin_lock(&mdev->peer_seq_lock);
1810 mdev->sync_conf = sc;
1811
1812 if (!rsr) {
1813 crypto_free_hash(mdev->csums_tfm);
1814 mdev->csums_tfm = csums_tfm;
1815 csums_tfm = NULL;
1816 }
1817
1818 if (!ovr) {
1819 crypto_free_hash(mdev->verify_tfm);
1820 mdev->verify_tfm = verify_tfm;
1821 verify_tfm = NULL;
1822 }
1823
1824 if (fifo_size != mdev->rs_plan_s.size) {
1825 kfree(mdev->rs_plan_s.values);
1826 mdev->rs_plan_s.values = rs_plan_s;
1827 mdev->rs_plan_s.size = fifo_size;
1828 mdev->rs_planed = 0;
1829 rs_plan_s = NULL;
1830 }
1831
1832 spin_unlock(&mdev->peer_seq_lock);
1833
1834 if (get_ldev(mdev)) {
1835 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
1836 drbd_al_shrink(mdev);
1837 err = drbd_check_al_size(mdev);
1838 lc_unlock(mdev->act_log);
1839 wake_up(&mdev->al_wait);
1840
1841 put_ldev(mdev);
1842 drbd_md_sync(mdev);
1843
1844 if (err) {
1845 retcode = ERR_NOMEM;
1846 goto fail;
1847 }
1848 }
1849
1850 if (mdev->state.conn >= C_CONNECTED)
1851 drbd_send_sync_param(mdev, &sc);
1852
1853 if (!cpumask_equal(mdev->cpu_mask, new_cpu_mask)) {
1854 cpumask_copy(mdev->cpu_mask, new_cpu_mask);
1855 drbd_calc_cpu_mask(mdev);
1856 mdev->receiver.reset_cpu_mask = 1;
1857 mdev->asender.reset_cpu_mask = 1;
1858 mdev->worker.reset_cpu_mask = 1;
1859 }
1860
1861 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1862 fail:
1863 kfree(rs_plan_s);
1864 free_cpumask_var(new_cpu_mask);
1865 crypto_free_hash(csums_tfm);
1866 crypto_free_hash(verify_tfm);
1867 reply->ret_code = retcode;
1868 return 0;
1869 }
1870
1871 static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1872 struct drbd_nl_cfg_reply *reply)
1873 {
1874 int retcode;
1875
1876 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
1877
1878 if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
1879 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1880
1881 while (retcode == SS_NEED_CONNECTION) {
1882 spin_lock_irq(&mdev->req_lock);
1883 if (mdev->state.conn < C_CONNECTED)
1884 retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL);
1885 spin_unlock_irq(&mdev->req_lock);
1886
1887 if (retcode != SS_NEED_CONNECTION)
1888 break;
1889
1890 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1891 }
1892
1893 reply->ret_code = retcode;
1894 return 0;
1895 }
1896
1897 static int drbd_bmio_set_susp_al(struct drbd_conf *mdev)
1898 {
1899 int rv;
1900
1901 rv = drbd_bmio_set_n_write(mdev);
1902 drbd_suspend_al(mdev);
1903 return rv;
1904 }
1905
1906 static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1907 struct drbd_nl_cfg_reply *reply)
1908 {
1909 int retcode;
1910
1911 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED);
1912
1913 if (retcode < SS_SUCCESS) {
1914 if (retcode == SS_NEED_CONNECTION && mdev->state.role == R_PRIMARY) {
1915 /* The peer will get a resync upon connect anyways. Just make that
1916 into a full resync. */
1917 retcode = drbd_request_state(mdev, NS(pdsk, D_INCONSISTENT));
1918 if (retcode >= SS_SUCCESS) {
1919 /* open coded drbd_bitmap_io() */
1920 if (drbd_bitmap_io(mdev, &drbd_bmio_set_susp_al,
1921 "set_n_write from invalidate_peer"))
1922 retcode = ERR_IO_MD_DISK;
1923 }
1924 } else
1925 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
1926 }
1927
1928 reply->ret_code = retcode;
1929 return 0;
1930 }
1931
1932 static int drbd_nl_pause_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1933 struct drbd_nl_cfg_reply *reply)
1934 {
1935 int retcode = NO_ERROR;
1936
1937 if (drbd_request_state(mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
1938 retcode = ERR_PAUSE_IS_SET;
1939
1940 reply->ret_code = retcode;
1941 return 0;
1942 }
1943
1944 static int drbd_nl_resume_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1945 struct drbd_nl_cfg_reply *reply)
1946 {
1947 int retcode = NO_ERROR;
1948
1949 if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO)
1950 retcode = ERR_PAUSE_IS_CLEAR;
1951
1952 reply->ret_code = retcode;
1953 return 0;
1954 }
1955
1956 static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1957 struct drbd_nl_cfg_reply *reply)
1958 {
1959 reply->ret_code = drbd_request_state(mdev, NS(susp, 1));
1960
1961 return 0;
1962 }
1963
1964 static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1965 struct drbd_nl_cfg_reply *reply)
1966 {
1967 if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
1968 drbd_uuid_new_current(mdev);
1969 clear_bit(NEW_CUR_UUID, &mdev->flags);
1970 }
1971 drbd_suspend_io(mdev);
1972 reply->ret_code = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0));
1973 if (reply->ret_code == SS_SUCCESS) {
1974 if (mdev->state.conn < C_CONNECTED)
1975 tl_clear(mdev);
1976 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED)
1977 tl_restart(mdev, fail_frozen_disk_io);
1978 }
1979 drbd_resume_io(mdev);
1980
1981 return 0;
1982 }
1983
1984 static int drbd_nl_outdate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1985 struct drbd_nl_cfg_reply *reply)
1986 {
1987 reply->ret_code = drbd_request_state(mdev, NS(disk, D_OUTDATED));
1988 return 0;
1989 }
1990
1991 static int drbd_nl_get_config(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1992 struct drbd_nl_cfg_reply *reply)
1993 {
1994 unsigned short *tl;
1995
1996 tl = reply->tag_list;
1997
1998 if (get_ldev(mdev)) {
1999 tl = disk_conf_to_tags(mdev, &mdev->ldev->dc, tl);
2000 put_ldev(mdev);
2001 }
2002
2003 if (get_net_conf(mdev)) {
2004 tl = net_conf_to_tags(mdev, mdev->net_conf, tl);
2005 put_net_conf(mdev);
2006 }
2007 tl = syncer_conf_to_tags(mdev, &mdev->sync_conf, tl);
2008
2009 put_unaligned(TT_END, tl++); /* Close the tag list */
2010
2011 return (int)((char *)tl - (char *)reply->tag_list);
2012 }
2013
2014 static int drbd_nl_get_state(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2015 struct drbd_nl_cfg_reply *reply)
2016 {
2017 unsigned short *tl = reply->tag_list;
2018 union drbd_state s = mdev->state;
2019 unsigned long rs_left;
2020 unsigned int res;
2021
2022 tl = get_state_to_tags(mdev, (struct get_state *)&s, tl);
2023
2024 /* no local ref, no bitmap, no syncer progress. */
2025 if (s.conn >= C_SYNC_SOURCE && s.conn <= C_PAUSED_SYNC_T) {
2026 if (get_ldev(mdev)) {
2027 drbd_get_syncer_progress(mdev, &rs_left, &res);
2028 tl = tl_add_int(tl, T_sync_progress, &res);
2029 put_ldev(mdev);
2030 }
2031 }
2032 put_unaligned(TT_END, tl++); /* Close the tag list */
2033
2034 return (int)((char *)tl - (char *)reply->tag_list);
2035 }
2036
2037 static int drbd_nl_get_uuids(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2038 struct drbd_nl_cfg_reply *reply)
2039 {
2040 unsigned short *tl;
2041
2042 tl = reply->tag_list;
2043
2044 if (get_ldev(mdev)) {
2045 tl = tl_add_blob(tl, T_uuids, mdev->ldev->md.uuid, UI_SIZE*sizeof(u64));
2046 tl = tl_add_int(tl, T_uuids_flags, &mdev->ldev->md.flags);
2047 put_ldev(mdev);
2048 }
2049 put_unaligned(TT_END, tl++); /* Close the tag list */
2050
2051 return (int)((char *)tl - (char *)reply->tag_list);
2052 }
2053
2054 /**
2055 * drbd_nl_get_timeout_flag() - Used by drbdsetup to find out which timeout value to use
2056 * @mdev: DRBD device.
2057 * @nlp: Netlink/connector packet from drbdsetup
2058 * @reply: Reply packet for drbdsetup
2059 */
2060 static int drbd_nl_get_timeout_flag(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2061 struct drbd_nl_cfg_reply *reply)
2062 {
2063 unsigned short *tl;
2064 char rv;
2065
2066 tl = reply->tag_list;
2067
2068 rv = mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
2069 test_bit(USE_DEGR_WFC_T, &mdev->flags) ? UT_DEGRADED : UT_DEFAULT;
2070
2071 tl = tl_add_blob(tl, T_use_degraded, &rv, sizeof(rv));
2072 put_unaligned(TT_END, tl++); /* Close the tag list */
2073
2074 return (int)((char *)tl - (char *)reply->tag_list);
2075 }
2076
2077 static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2078 struct drbd_nl_cfg_reply *reply)
2079 {
2080 /* default to resume from last known position, if possible */
2081 struct start_ov args =
2082 { .start_sector = mdev->ov_start_sector };
2083
2084 if (!start_ov_from_tags(mdev, nlp->tag_list, &args)) {
2085 reply->ret_code = ERR_MANDATORY_TAG;
2086 return 0;
2087 }
2088 /* w_make_ov_request expects position to be aligned */
2089 mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT;
2090 reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
2091 return 0;
2092 }
2093
2094
2095 static int drbd_nl_new_c_uuid(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2096 struct drbd_nl_cfg_reply *reply)
2097 {
2098 int retcode = NO_ERROR;
2099 int skip_initial_sync = 0;
2100 int err;
2101
2102 struct new_c_uuid args;
2103
2104 memset(&args, 0, sizeof(struct new_c_uuid));
2105 if (!new_c_uuid_from_tags(mdev, nlp->tag_list, &args)) {
2106 reply->ret_code = ERR_MANDATORY_TAG;
2107 return 0;
2108 }
2109
2110 mutex_lock(&mdev->state_mutex); /* Protects us against serialized state changes. */
2111
2112 if (!get_ldev(mdev)) {
2113 retcode = ERR_NO_DISK;
2114 goto out;
2115 }
2116
2117 /* this is "skip initial sync", assume to be clean */
2118 if (mdev->state.conn == C_CONNECTED && mdev->agreed_pro_version >= 90 &&
2119 mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
2120 dev_info(DEV, "Preparing to skip initial sync\n");
2121 skip_initial_sync = 1;
2122 } else if (mdev->state.conn != C_STANDALONE) {
2123 retcode = ERR_CONNECTED;
2124 goto out_dec;
2125 }
2126
2127 drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
2128 drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
2129
2130 if (args.clear_bm) {
2131 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, "clear_n_write from new_c_uuid");
2132 if (err) {
2133 dev_err(DEV, "Writing bitmap failed with %d\n",err);
2134 retcode = ERR_IO_MD_DISK;
2135 }
2136 if (skip_initial_sync) {
2137 drbd_send_uuids_skip_initial_sync(mdev);
2138 _drbd_uuid_set(mdev, UI_BITMAP, 0);
2139 spin_lock_irq(&mdev->req_lock);
2140 _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
2141 CS_VERBOSE, NULL);
2142 spin_unlock_irq(&mdev->req_lock);
2143 }
2144 }
2145
2146 drbd_md_sync(mdev);
2147 out_dec:
2148 put_ldev(mdev);
2149 out:
2150 mutex_unlock(&mdev->state_mutex);
2151
2152 reply->ret_code = retcode;
2153 return 0;
2154 }
2155
2156 struct cn_handler_struct {
2157 int (*function)(struct drbd_conf *,
2158 struct drbd_nl_cfg_req *,
2159 struct drbd_nl_cfg_reply *);
2160 int reply_body_size;
2161 };
2162
2163 static struct cn_handler_struct cnd_table[] = {
2164 [ P_primary ] = { &drbd_nl_primary, 0 },
2165 [ P_secondary ] = { &drbd_nl_secondary, 0 },
2166 [ P_disk_conf ] = { &drbd_nl_disk_conf, 0 },
2167 [ P_detach ] = { &drbd_nl_detach, 0 },
2168 [ P_net_conf ] = { &drbd_nl_net_conf, 0 },
2169 [ P_disconnect ] = { &drbd_nl_disconnect, 0 },
2170 [ P_resize ] = { &drbd_nl_resize, 0 },
2171 [ P_syncer_conf ] = { &drbd_nl_syncer_conf, 0 },
2172 [ P_invalidate ] = { &drbd_nl_invalidate, 0 },
2173 [ P_invalidate_peer ] = { &drbd_nl_invalidate_peer, 0 },
2174 [ P_pause_sync ] = { &drbd_nl_pause_sync, 0 },
2175 [ P_resume_sync ] = { &drbd_nl_resume_sync, 0 },
2176 [ P_suspend_io ] = { &drbd_nl_suspend_io, 0 },
2177 [ P_resume_io ] = { &drbd_nl_resume_io, 0 },
2178 [ P_outdate ] = { &drbd_nl_outdate, 0 },
2179 [ P_get_config ] = { &drbd_nl_get_config,
2180 sizeof(struct syncer_conf_tag_len_struct) +
2181 sizeof(struct disk_conf_tag_len_struct) +
2182 sizeof(struct net_conf_tag_len_struct) },
2183 [ P_get_state ] = { &drbd_nl_get_state,
2184 sizeof(struct get_state_tag_len_struct) +
2185 sizeof(struct sync_progress_tag_len_struct) },
2186 [ P_get_uuids ] = { &drbd_nl_get_uuids,
2187 sizeof(struct get_uuids_tag_len_struct) },
2188 [ P_get_timeout_flag ] = { &drbd_nl_get_timeout_flag,
2189 sizeof(struct get_timeout_flag_tag_len_struct)},
2190 [ P_start_ov ] = { &drbd_nl_start_ov, 0 },
2191 [ P_new_c_uuid ] = { &drbd_nl_new_c_uuid, 0 },
2192 };
2193
2194 static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp)
2195 {
2196 struct drbd_nl_cfg_req *nlp = (struct drbd_nl_cfg_req *)req->data;
2197 struct cn_handler_struct *cm;
2198 struct cn_msg *cn_reply;
2199 struct drbd_nl_cfg_reply *reply;
2200 struct drbd_conf *mdev;
2201 int retcode, rr;
2202 int reply_size = sizeof(struct cn_msg)
2203 + sizeof(struct drbd_nl_cfg_reply)
2204 + sizeof(short int);
2205
2206 if (!try_module_get(THIS_MODULE)) {
2207 printk(KERN_ERR "drbd: try_module_get() failed!\n");
2208 return;
2209 }
2210
2211 if (!cap_raised(nsp->eff_cap, CAP_SYS_ADMIN)) {
2212 retcode = ERR_PERM;
2213 goto fail;
2214 }
2215
2216 mdev = ensure_mdev(nlp->drbd_minor,
2217 (nlp->flags & DRBD_NL_CREATE_DEVICE));
2218 if (!mdev) {
2219 retcode = ERR_MINOR_INVALID;
2220 goto fail;
2221 }
2222
2223 if (nlp->packet_type >= P_nl_after_last_packet) {
2224 retcode = ERR_PACKET_NR;
2225 goto fail;
2226 }
2227
2228 cm = cnd_table + nlp->packet_type;
2229
2230 /* This may happen if packet number is 0: */
2231 if (cm->function == NULL) {
2232 retcode = ERR_PACKET_NR;
2233 goto fail;
2234 }
2235
2236 reply_size += cm->reply_body_size;
2237
2238 /* allocation not in the IO path, cqueue thread context */
2239 cn_reply = kmalloc(reply_size, GFP_KERNEL);
2240 if (!cn_reply) {
2241 retcode = ERR_NOMEM;
2242 goto fail;
2243 }
2244 reply = (struct drbd_nl_cfg_reply *) cn_reply->data;
2245
2246 reply->packet_type =
2247 cm->reply_body_size ? nlp->packet_type : P_nl_after_last_packet;
2248 reply->minor = nlp->drbd_minor;
2249 reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */
2250 /* reply->tag_list; might be modified by cm->function. */
2251
2252 rr = cm->function(mdev, nlp, reply);
2253
2254 cn_reply->id = req->id;
2255 cn_reply->seq = req->seq;
2256 cn_reply->ack = req->ack + 1;
2257 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + rr;
2258 cn_reply->flags = 0;
2259
2260 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL);
2261 if (rr && rr != -ESRCH)
2262 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2263
2264 kfree(cn_reply);
2265 module_put(THIS_MODULE);
2266 return;
2267 fail:
2268 drbd_nl_send_reply(req, retcode);
2269 module_put(THIS_MODULE);
2270 }
2271
2272 static atomic_t drbd_nl_seq = ATOMIC_INIT(2); /* two. */
2273
2274 static unsigned short *
2275 __tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data,
2276 unsigned short len, int nul_terminated)
2277 {
2278 unsigned short l = tag_descriptions[tag_number(tag)].max_len;
2279 len = (len < l) ? len : l;
2280 put_unaligned(tag, tl++);
2281 put_unaligned(len, tl++);
2282 memcpy(tl, data, len);
2283 tl = (unsigned short*)((char*)tl + len);
2284 if (nul_terminated)
2285 *((char*)tl - 1) = 0;
2286 return tl;
2287 }
2288
2289 static unsigned short *
2290 tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, int len)
2291 {
2292 return __tl_add_blob(tl, tag, data, len, 0);
2293 }
2294
2295 static unsigned short *
2296 tl_add_str(unsigned short *tl, enum drbd_tags tag, const char *str)
2297 {
2298 return __tl_add_blob(tl, tag, str, strlen(str)+1, 0);
2299 }
2300
2301 static unsigned short *
2302 tl_add_int(unsigned short *tl, enum drbd_tags tag, const void *val)
2303 {
2304 put_unaligned(tag, tl++);
2305 switch(tag_type(tag)) {
2306 case TT_INTEGER:
2307 put_unaligned(sizeof(int), tl++);
2308 put_unaligned(*(int *)val, (int *)tl);
2309 tl = (unsigned short*)((char*)tl+sizeof(int));
2310 break;
2311 case TT_INT64:
2312 put_unaligned(sizeof(u64), tl++);
2313 put_unaligned(*(u64 *)val, (u64 *)tl);
2314 tl = (unsigned short*)((char*)tl+sizeof(u64));
2315 break;
2316 default:
2317 /* someone did something stupid. */
2318 ;
2319 }
2320 return tl;
2321 }
2322
2323 void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state state)
2324 {
2325 char buffer[sizeof(struct cn_msg)+
2326 sizeof(struct drbd_nl_cfg_reply)+
2327 sizeof(struct get_state_tag_len_struct)+
2328 sizeof(short int)];
2329 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2330 struct drbd_nl_cfg_reply *reply =
2331 (struct drbd_nl_cfg_reply *)cn_reply->data;
2332 unsigned short *tl = reply->tag_list;
2333
2334 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2335
2336 tl = get_state_to_tags(mdev, (struct get_state *)&state, tl);
2337
2338 put_unaligned(TT_END, tl++); /* Close the tag list */
2339
2340 cn_reply->id.idx = CN_IDX_DRBD;
2341 cn_reply->id.val = CN_VAL_DRBD;
2342
2343 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2344 cn_reply->ack = 0; /* not used here. */
2345 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2346 (int)((char *)tl - (char *)reply->tag_list);
2347 cn_reply->flags = 0;
2348
2349 reply->packet_type = P_get_state;
2350 reply->minor = mdev_to_minor(mdev);
2351 reply->ret_code = NO_ERROR;
2352
2353 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2354 }
2355
2356 void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name)
2357 {
2358 char buffer[sizeof(struct cn_msg)+
2359 sizeof(struct drbd_nl_cfg_reply)+
2360 sizeof(struct call_helper_tag_len_struct)+
2361 sizeof(short int)];
2362 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2363 struct drbd_nl_cfg_reply *reply =
2364 (struct drbd_nl_cfg_reply *)cn_reply->data;
2365 unsigned short *tl = reply->tag_list;
2366
2367 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2368
2369 tl = tl_add_str(tl, T_helper, helper_name);
2370 put_unaligned(TT_END, tl++); /* Close the tag list */
2371
2372 cn_reply->id.idx = CN_IDX_DRBD;
2373 cn_reply->id.val = CN_VAL_DRBD;
2374
2375 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2376 cn_reply->ack = 0; /* not used here. */
2377 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2378 (int)((char *)tl - (char *)reply->tag_list);
2379 cn_reply->flags = 0;
2380
2381 reply->packet_type = P_call_helper;
2382 reply->minor = mdev_to_minor(mdev);
2383 reply->ret_code = NO_ERROR;
2384
2385 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2386 }
2387
2388 void drbd_bcast_ee(struct drbd_conf *mdev,
2389 const char *reason, const int dgs,
2390 const char* seen_hash, const char* calc_hash,
2391 const struct drbd_epoch_entry* e)
2392 {
2393 struct cn_msg *cn_reply;
2394 struct drbd_nl_cfg_reply *reply;
2395 unsigned short *tl;
2396 struct page *page;
2397 unsigned len;
2398
2399 if (!e)
2400 return;
2401 if (!reason || !reason[0])
2402 return;
2403
2404 /* apparently we have to memcpy twice, first to prepare the data for the
2405 * struct cn_msg, then within cn_netlink_send from the cn_msg to the
2406 * netlink skb. */
2407 /* receiver thread context, which is not in the writeout path (of this node),
2408 * but may be in the writeout path of the _other_ node.
2409 * GFP_NOIO to avoid potential "distributed deadlock". */
2410 cn_reply = kmalloc(
2411 sizeof(struct cn_msg)+
2412 sizeof(struct drbd_nl_cfg_reply)+
2413 sizeof(struct dump_ee_tag_len_struct)+
2414 sizeof(short int),
2415 GFP_NOIO);
2416
2417 if (!cn_reply) {
2418 dev_err(DEV, "could not kmalloc buffer for drbd_bcast_ee, sector %llu, size %u\n",
2419 (unsigned long long)e->sector, e->size);
2420 return;
2421 }
2422
2423 reply = (struct drbd_nl_cfg_reply*)cn_reply->data;
2424 tl = reply->tag_list;
2425
2426 tl = tl_add_str(tl, T_dump_ee_reason, reason);
2427 tl = tl_add_blob(tl, T_seen_digest, seen_hash, dgs);
2428 tl = tl_add_blob(tl, T_calc_digest, calc_hash, dgs);
2429 tl = tl_add_int(tl, T_ee_sector, &e->sector);
2430 tl = tl_add_int(tl, T_ee_block_id, &e->block_id);
2431
2432 put_unaligned(T_ee_data, tl++);
2433 put_unaligned(e->size, tl++);
2434
2435 len = e->size;
2436 page = e->pages;
2437 page_chain_for_each(page) {
2438 void *d = kmap_atomic(page, KM_USER0);
2439 unsigned l = min_t(unsigned, len, PAGE_SIZE);
2440 memcpy(tl, d, l);
2441 kunmap_atomic(d, KM_USER0);
2442 tl = (unsigned short*)((char*)tl + l);
2443 len -= l;
2444 }
2445 put_unaligned(TT_END, tl++); /* Close the tag list */
2446
2447 cn_reply->id.idx = CN_IDX_DRBD;
2448 cn_reply->id.val = CN_VAL_DRBD;
2449
2450 cn_reply->seq = atomic_add_return(1,&drbd_nl_seq);
2451 cn_reply->ack = 0; // not used here.
2452 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2453 (int)((char*)tl - (char*)reply->tag_list);
2454 cn_reply->flags = 0;
2455
2456 reply->packet_type = P_dump_ee;
2457 reply->minor = mdev_to_minor(mdev);
2458 reply->ret_code = NO_ERROR;
2459
2460 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2461 kfree(cn_reply);
2462 }
2463
2464 void drbd_bcast_sync_progress(struct drbd_conf *mdev)
2465 {
2466 char buffer[sizeof(struct cn_msg)+
2467 sizeof(struct drbd_nl_cfg_reply)+
2468 sizeof(struct sync_progress_tag_len_struct)+
2469 sizeof(short int)];
2470 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2471 struct drbd_nl_cfg_reply *reply =
2472 (struct drbd_nl_cfg_reply *)cn_reply->data;
2473 unsigned short *tl = reply->tag_list;
2474 unsigned long rs_left;
2475 unsigned int res;
2476
2477 /* no local ref, no bitmap, no syncer progress, no broadcast. */
2478 if (!get_ldev(mdev))
2479 return;
2480 drbd_get_syncer_progress(mdev, &rs_left, &res);
2481 put_ldev(mdev);
2482
2483 tl = tl_add_int(tl, T_sync_progress, &res);
2484 put_unaligned(TT_END, tl++); /* Close the tag list */
2485
2486 cn_reply->id.idx = CN_IDX_DRBD;
2487 cn_reply->id.val = CN_VAL_DRBD;
2488
2489 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2490 cn_reply->ack = 0; /* not used here. */
2491 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2492 (int)((char *)tl - (char *)reply->tag_list);
2493 cn_reply->flags = 0;
2494
2495 reply->packet_type = P_sync_progress;
2496 reply->minor = mdev_to_minor(mdev);
2497 reply->ret_code = NO_ERROR;
2498
2499 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2500 }
2501
2502 int __init drbd_nl_init(void)
2503 {
2504 static struct cb_id cn_id_drbd;
2505 int err, try=10;
2506
2507 cn_id_drbd.val = CN_VAL_DRBD;
2508 do {
2509 cn_id_drbd.idx = cn_idx;
2510 err = cn_add_callback(&cn_id_drbd, "cn_drbd", &drbd_connector_callback);
2511 if (!err)
2512 break;
2513 cn_idx = (cn_idx + CN_IDX_STEP);
2514 } while (try--);
2515
2516 if (err) {
2517 printk(KERN_ERR "drbd: cn_drbd failed to register\n");
2518 return err;
2519 }
2520
2521 return 0;
2522 }
2523
2524 void drbd_nl_cleanup(void)
2525 {
2526 static struct cb_id cn_id_drbd;
2527
2528 cn_id_drbd.idx = cn_idx;
2529 cn_id_drbd.val = CN_VAL_DRBD;
2530
2531 cn_del_callback(&cn_id_drbd);
2532 }
2533
2534 void drbd_nl_send_reply(struct cn_msg *req, int ret_code)
2535 {
2536 char buffer[sizeof(struct cn_msg)+sizeof(struct drbd_nl_cfg_reply)];
2537 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2538 struct drbd_nl_cfg_reply *reply =
2539 (struct drbd_nl_cfg_reply *)cn_reply->data;
2540 int rr;
2541
2542 cn_reply->id = req->id;
2543
2544 cn_reply->seq = req->seq;
2545 cn_reply->ack = req->ack + 1;
2546 cn_reply->len = sizeof(struct drbd_nl_cfg_reply);
2547 cn_reply->flags = 0;
2548
2549 reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor;
2550 reply->ret_code = ret_code;
2551
2552 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2553 if (rr && rr != -ESRCH)
2554 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2555 }
2556
Linux with added FPC-III support