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Merge branch 'for-2.6.39/drivers' of git://git.kernel.dk/linux-2.6-block
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / block / drbd / drbd_nl.c
blob03b29f78a37d78ac8955db9ae43ca8609b963d91
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 enum drbd_state_rv
292 drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
293 {
294 const int max_tries = 4;
295 enum drbd_state_rv rv = SS_UNKNOWN_ERROR;
296 int try = 0;
297 int forced = 0;
298 union drbd_state mask, val;
299 enum drbd_disk_state nps;
300
301 if (new_role == R_PRIMARY)
302 request_ping(mdev); /* Detect a dead peer ASAP */
303
304 mutex_lock(&mdev->state_mutex);
305
306 mask.i = 0; mask.role = R_MASK;
307 val.i = 0; val.role = new_role;
308
309 while (try++ < max_tries) {
310 rv = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE);
311
312 /* in case we first succeeded to outdate,
313 * but now suddenly could establish a connection */
314 if (rv == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
315 val.pdsk = 0;
316 mask.pdsk = 0;
317 continue;
318 }
319
320 if (rv == SS_NO_UP_TO_DATE_DISK && force &&
321 (mdev->state.disk < D_UP_TO_DATE &&
322 mdev->state.disk >= D_INCONSISTENT)) {
323 mask.disk = D_MASK;
324 val.disk = D_UP_TO_DATE;
325 forced = 1;
326 continue;
327 }
328
329 if (rv == SS_NO_UP_TO_DATE_DISK &&
330 mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) {
331 D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
332 nps = drbd_try_outdate_peer(mdev);
333
334 if (nps == D_OUTDATED || nps == D_INCONSISTENT) {
335 val.disk = D_UP_TO_DATE;
336 mask.disk = D_MASK;
337 }
338
339 val.pdsk = nps;
340 mask.pdsk = D_MASK;
341
342 continue;
343 }
344
345 if (rv == SS_NOTHING_TO_DO)
346 goto fail;
347 if (rv == SS_PRIMARY_NOP && mask.pdsk == 0) {
348 nps = drbd_try_outdate_peer(mdev);
349
350 if (force && nps > D_OUTDATED) {
351 dev_warn(DEV, "Forced into split brain situation!\n");
352 nps = D_OUTDATED;
353 }
354
355 mask.pdsk = D_MASK;
356 val.pdsk = nps;
357
358 continue;
359 }
360 if (rv == SS_TWO_PRIMARIES) {
361 /* Maybe the peer is detected as dead very soon...
362 retry at most once more in this case. */
363 schedule_timeout_interruptible((mdev->net_conf->ping_timeo+1)*HZ/10);
364 if (try < max_tries)
365 try = max_tries - 1;
366 continue;
367 }
368 if (rv < SS_SUCCESS) {
369 rv = _drbd_request_state(mdev, mask, val,
370 CS_VERBOSE + CS_WAIT_COMPLETE);
371 if (rv < SS_SUCCESS)
372 goto fail;
373 }
374 break;
375 }
376
377 if (rv < 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 /* writeout of activity log covered areas of the bitmap
410 * to stable storage done in after state change already */
411
412 if (mdev->state.conn >= C_WF_REPORT_PARAMS) {
413 /* if this was forced, we should consider sync */
414 if (forced)
415 drbd_send_uuids(mdev);
416 drbd_send_state(mdev);
417 }
418
419 drbd_md_sync(mdev);
420
421 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
422 fail:
423 mutex_unlock(&mdev->state_mutex);
424 return rv;
425 }
426
427 static struct drbd_conf *ensure_mdev(int minor, int create)
428 {
429 struct drbd_conf *mdev;
430
431 if (minor >= minor_count)
432 return NULL;
433
434 mdev = minor_to_mdev(minor);
435
436 if (!mdev && create) {
437 struct gendisk *disk = NULL;
438 mdev = drbd_new_device(minor);
439
440 spin_lock_irq(&drbd_pp_lock);
441 if (minor_table[minor] == NULL) {
442 minor_table[minor] = mdev;
443 disk = mdev->vdisk;
444 mdev = NULL;
445 } /* else: we lost the race */
446 spin_unlock_irq(&drbd_pp_lock);
447
448 if (disk) /* we won the race above */
449 /* in case we ever add a drbd_delete_device(),
450 * don't forget the del_gendisk! */
451 add_disk(disk);
452 else /* we lost the race above */
453 drbd_free_mdev(mdev);
454
455 mdev = minor_to_mdev(minor);
456 }
457
458 return mdev;
459 }
460
461 static int drbd_nl_primary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
462 struct drbd_nl_cfg_reply *reply)
463 {
464 struct primary primary_args;
465
466 memset(&primary_args, 0, sizeof(struct primary));
467 if (!primary_from_tags(mdev, nlp->tag_list, &primary_args)) {
468 reply->ret_code = ERR_MANDATORY_TAG;
469 return 0;
470 }
471
472 reply->ret_code =
473 drbd_set_role(mdev, R_PRIMARY, primary_args.primary_force);
474
475 return 0;
476 }
477
478 static int drbd_nl_secondary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
479 struct drbd_nl_cfg_reply *reply)
480 {
481 reply->ret_code = drbd_set_role(mdev, R_SECONDARY, 0);
482
483 return 0;
484 }
485
486 /* initializes the md.*_offset members, so we are able to find
487 * the on disk meta data */
488 static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
489 struct drbd_backing_dev *bdev)
490 {
491 sector_t md_size_sect = 0;
492 switch (bdev->dc.meta_dev_idx) {
493 default:
494 /* v07 style fixed size indexed meta data */
495 bdev->md.md_size_sect = MD_RESERVED_SECT;
496 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
497 bdev->md.al_offset = MD_AL_OFFSET;
498 bdev->md.bm_offset = MD_BM_OFFSET;
499 break;
500 case DRBD_MD_INDEX_FLEX_EXT:
501 /* just occupy the full device; unit: sectors */
502 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
503 bdev->md.md_offset = 0;
504 bdev->md.al_offset = MD_AL_OFFSET;
505 bdev->md.bm_offset = MD_BM_OFFSET;
506 break;
507 case DRBD_MD_INDEX_INTERNAL:
508 case DRBD_MD_INDEX_FLEX_INT:
509 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
510 /* al size is still fixed */
511 bdev->md.al_offset = -MD_AL_MAX_SIZE;
512 /* we need (slightly less than) ~ this much bitmap sectors: */
513 md_size_sect = drbd_get_capacity(bdev->backing_bdev);
514 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
515 md_size_sect = BM_SECT_TO_EXT(md_size_sect);
516 md_size_sect = ALIGN(md_size_sect, 8);
517
518 /* plus the "drbd meta data super block",
519 * and the activity log; */
520 md_size_sect += MD_BM_OFFSET;
521
522 bdev->md.md_size_sect = md_size_sect;
523 /* bitmap offset is adjusted by 'super' block size */
524 bdev->md.bm_offset = -md_size_sect + MD_AL_OFFSET;
525 break;
526 }
527 }
528
529 /* input size is expected to be in KB */
530 char *ppsize(char *buf, unsigned long long size)
531 {
532 /* Needs 9 bytes at max including trailing NUL:
533 * -1ULL ==> "16384 EB" */
534 static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
535 int base = 0;
536 while (size >= 10000 && base < sizeof(units)-1) {
537 /* shift + round */
538 size = (size >> 10) + !!(size & (1<<9));
539 base++;
540 }
541 sprintf(buf, "%u %cB", (unsigned)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 int err;
646
647 drbd_al_shrink(mdev); /* All extents inactive. */
648 dev_info(DEV, "Writing the whole bitmap, %s\n",
649 la_size_changed && md_moved ? "size changed and md moved" :
650 la_size_changed ? "size changed" : "md moved");
651 /* next line implicitly does drbd_suspend_io()+drbd_resume_io() */
652 err = drbd_bitmap_io(mdev, &drbd_bm_write,
653 "size changed", BM_LOCKED_MASK);
654 if (err) {
655 rv = dev_size_error;
656 goto out;
657 }
658 drbd_md_mark_dirty(mdev);
659 }
660
661 if (size > la_size)
662 rv = grew;
663 if (size < la_size)
664 rv = shrunk;
665 out:
666 lc_unlock(mdev->act_log);
667 wake_up(&mdev->al_wait);
668 drbd_resume_io(mdev);
669
670 return rv;
671 }
672
673 sector_t
674 drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev, int assume_peer_has_space)
675 {
676 sector_t p_size = mdev->p_size; /* partner's disk size. */
677 sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */
678 sector_t m_size; /* my size */
679 sector_t u_size = bdev->dc.disk_size; /* size requested by user. */
680 sector_t size = 0;
681
682 m_size = drbd_get_max_capacity(bdev);
683
684 if (mdev->state.conn < C_CONNECTED && assume_peer_has_space) {
685 dev_warn(DEV, "Resize while not connected was forced by the user!\n");
686 p_size = m_size;
687 }
688
689 if (p_size && m_size) {
690 size = min_t(sector_t, p_size, m_size);
691 } else {
692 if (la_size) {
693 size = la_size;
694 if (m_size && m_size < size)
695 size = m_size;
696 if (p_size && p_size < size)
697 size = p_size;
698 } else {
699 if (m_size)
700 size = m_size;
701 if (p_size)
702 size = p_size;
703 }
704 }
705
706 if (size == 0)
707 dev_err(DEV, "Both nodes diskless!\n");
708
709 if (u_size) {
710 if (u_size > size)
711 dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n",
712 (unsigned long)u_size>>1, (unsigned long)size>>1);
713 else
714 size = u_size;
715 }
716
717 return size;
718 }
719
720 /**
721 * drbd_check_al_size() - Ensures that the AL is of the right size
722 * @mdev: DRBD device.
723 *
724 * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
725 * failed, and 0 on success. You should call drbd_md_sync() after you called
726 * this function.
727 */
728 static int drbd_check_al_size(struct drbd_conf *mdev)
729 {
730 struct lru_cache *n, *t;
731 struct lc_element *e;
732 unsigned int in_use;
733 int i;
734
735 ERR_IF(mdev->sync_conf.al_extents < 7)
736 mdev->sync_conf.al_extents = 127;
737
738 if (mdev->act_log &&
739 mdev->act_log->nr_elements == mdev->sync_conf.al_extents)
740 return 0;
741
742 in_use = 0;
743 t = mdev->act_log;
744 n = lc_create("act_log", drbd_al_ext_cache,
745 mdev->sync_conf.al_extents, sizeof(struct lc_element), 0);
746
747 if (n == NULL) {
748 dev_err(DEV, "Cannot allocate act_log lru!\n");
749 return -ENOMEM;
750 }
751 spin_lock_irq(&mdev->al_lock);
752 if (t) {
753 for (i = 0; i < t->nr_elements; i++) {
754 e = lc_element_by_index(t, i);
755 if (e->refcnt)
756 dev_err(DEV, "refcnt(%d)==%d\n",
757 e->lc_number, e->refcnt);
758 in_use += e->refcnt;
759 }
760 }
761 if (!in_use)
762 mdev->act_log = n;
763 spin_unlock_irq(&mdev->al_lock);
764 if (in_use) {
765 dev_err(DEV, "Activity log still in use!\n");
766 lc_destroy(n);
767 return -EBUSY;
768 } else {
769 if (t)
770 lc_destroy(t);
771 }
772 drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */
773 return 0;
774 }
775
776 void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_bio_size) __must_hold(local)
777 {
778 struct request_queue * const q = mdev->rq_queue;
779 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
780 int max_segments = mdev->ldev->dc.max_bio_bvecs;
781 int max_hw_sectors = min(queue_max_hw_sectors(b), max_bio_size >> 9);
782
783 blk_queue_logical_block_size(q, 512);
784 blk_queue_max_hw_sectors(q, max_hw_sectors);
785 /* This is the workaround for "bio would need to, but cannot, be split" */
786 blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
787 blk_queue_segment_boundary(q, PAGE_CACHE_SIZE-1);
788 blk_queue_stack_limits(q, b);
789
790 dev_info(DEV, "max BIO size = %u\n", queue_max_hw_sectors(q) << 9);
791
792 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
793 dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
794 q->backing_dev_info.ra_pages,
795 b->backing_dev_info.ra_pages);
796 q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
797 }
798 }
799
800 /* serialize deconfig (worker exiting, doing cleanup)
801 * and reconfig (drbdsetup disk, drbdsetup net)
802 *
803 * Wait for a potentially exiting worker, then restart it,
804 * or start a new one. Flush any pending work, there may still be an
805 * after_state_change queued.
806 */
807 static void drbd_reconfig_start(struct drbd_conf *mdev)
808 {
809 wait_event(mdev->state_wait, !test_and_set_bit(CONFIG_PENDING, &mdev->flags));
810 wait_event(mdev->state_wait, !test_bit(DEVICE_DYING, &mdev->flags));
811 drbd_thread_start(&mdev->worker);
812 drbd_flush_workqueue(mdev);
813 }
814
815 /* if still unconfigured, stops worker again.
816 * if configured now, clears CONFIG_PENDING.
817 * wakes potential waiters */
818 static void drbd_reconfig_done(struct drbd_conf *mdev)
819 {
820 spin_lock_irq(&mdev->req_lock);
821 if (mdev->state.disk == D_DISKLESS &&
822 mdev->state.conn == C_STANDALONE &&
823 mdev->state.role == R_SECONDARY) {
824 set_bit(DEVICE_DYING, &mdev->flags);
825 drbd_thread_stop_nowait(&mdev->worker);
826 } else
827 clear_bit(CONFIG_PENDING, &mdev->flags);
828 spin_unlock_irq(&mdev->req_lock);
829 wake_up(&mdev->state_wait);
830 }
831
832 /* Make sure IO is suspended before calling this function(). */
833 static void drbd_suspend_al(struct drbd_conf *mdev)
834 {
835 int s = 0;
836
837 if (lc_try_lock(mdev->act_log)) {
838 drbd_al_shrink(mdev);
839 lc_unlock(mdev->act_log);
840 } else {
841 dev_warn(DEV, "Failed to lock al in drbd_suspend_al()\n");
842 return;
843 }
844
845 spin_lock_irq(&mdev->req_lock);
846 if (mdev->state.conn < C_CONNECTED)
847 s = !test_and_set_bit(AL_SUSPENDED, &mdev->flags);
848
849 spin_unlock_irq(&mdev->req_lock);
850
851 if (s)
852 dev_info(DEV, "Suspended AL updates\n");
853 }
854
855 /* does always return 0;
856 * interesting return code is in reply->ret_code */
857 static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
858 struct drbd_nl_cfg_reply *reply)
859 {
860 enum drbd_ret_code retcode;
861 enum determine_dev_size dd;
862 sector_t max_possible_sectors;
863 sector_t min_md_device_sectors;
864 struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
865 struct block_device *bdev;
866 struct lru_cache *resync_lru = NULL;
867 union drbd_state ns, os;
868 unsigned int max_bio_size;
869 enum drbd_state_rv rv;
870 int cp_discovered = 0;
871 int logical_block_size;
872
873 drbd_reconfig_start(mdev);
874
875 /* if you want to reconfigure, please tear down first */
876 if (mdev->state.disk > D_DISKLESS) {
877 retcode = ERR_DISK_CONFIGURED;
878 goto fail;
879 }
880 /* It may just now have detached because of IO error. Make sure
881 * drbd_ldev_destroy is done already, we may end up here very fast,
882 * e.g. if someone calls attach from the on-io-error handler,
883 * to realize a "hot spare" feature (not that I'd recommend that) */
884 wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt));
885
886 /* allocation not in the IO path, cqueue thread context */
887 nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
888 if (!nbc) {
889 retcode = ERR_NOMEM;
890 goto fail;
891 }
892
893 nbc->dc.disk_size = DRBD_DISK_SIZE_SECT_DEF;
894 nbc->dc.on_io_error = DRBD_ON_IO_ERROR_DEF;
895 nbc->dc.fencing = DRBD_FENCING_DEF;
896 nbc->dc.max_bio_bvecs = DRBD_MAX_BIO_BVECS_DEF;
897
898 if (!disk_conf_from_tags(mdev, nlp->tag_list, &nbc->dc)) {
899 retcode = ERR_MANDATORY_TAG;
900 goto fail;
901 }
902
903 if (nbc->dc.meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
904 retcode = ERR_MD_IDX_INVALID;
905 goto fail;
906 }
907
908 if (get_net_conf(mdev)) {
909 int prot = mdev->net_conf->wire_protocol;
910 put_net_conf(mdev);
911 if (nbc->dc.fencing == FP_STONITH && prot == DRBD_PROT_A) {
912 retcode = ERR_STONITH_AND_PROT_A;
913 goto fail;
914 }
915 }
916
917 bdev = blkdev_get_by_path(nbc->dc.backing_dev,
918 FMODE_READ | FMODE_WRITE | FMODE_EXCL, mdev);
919 if (IS_ERR(bdev)) {
920 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev,
921 PTR_ERR(bdev));
922 retcode = ERR_OPEN_DISK;
923 goto fail;
924 }
925 nbc->backing_bdev = bdev;
926
927 /*
928 * meta_dev_idx >= 0: external fixed size, possibly multiple
929 * drbd sharing one meta device. TODO in that case, paranoia
930 * check that [md_bdev, meta_dev_idx] is not yet used by some
931 * other drbd minor! (if you use drbd.conf + drbdadm, that
932 * should check it for you already; but if you don't, or
933 * someone fooled it, we need to double check here)
934 */
935 bdev = blkdev_get_by_path(nbc->dc.meta_dev,
936 FMODE_READ | FMODE_WRITE | FMODE_EXCL,
937 (nbc->dc.meta_dev_idx < 0) ?
938 (void *)mdev : (void *)drbd_m_holder);
939 if (IS_ERR(bdev)) {
940 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev,
941 PTR_ERR(bdev));
942 retcode = ERR_OPEN_MD_DISK;
943 goto fail;
944 }
945 nbc->md_bdev = bdev;
946
947 if ((nbc->backing_bdev == nbc->md_bdev) !=
948 (nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
949 nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
950 retcode = ERR_MD_IDX_INVALID;
951 goto fail;
952 }
953
954 resync_lru = lc_create("resync", drbd_bm_ext_cache,
955 61, sizeof(struct bm_extent),
956 offsetof(struct bm_extent, lce));
957 if (!resync_lru) {
958 retcode = ERR_NOMEM;
959 goto fail;
960 }
961
962 /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
963 drbd_md_set_sector_offsets(mdev, nbc);
964
965 if (drbd_get_max_capacity(nbc) < nbc->dc.disk_size) {
966 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
967 (unsigned long long) drbd_get_max_capacity(nbc),
968 (unsigned long long) nbc->dc.disk_size);
969 retcode = ERR_DISK_TO_SMALL;
970 goto fail;
971 }
972
973 if (nbc->dc.meta_dev_idx < 0) {
974 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
975 /* at least one MB, otherwise it does not make sense */
976 min_md_device_sectors = (2<<10);
977 } else {
978 max_possible_sectors = DRBD_MAX_SECTORS;
979 min_md_device_sectors = MD_RESERVED_SECT * (nbc->dc.meta_dev_idx + 1);
980 }
981
982 if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
983 retcode = ERR_MD_DISK_TO_SMALL;
984 dev_warn(DEV, "refusing attach: md-device too small, "
985 "at least %llu sectors needed for this meta-disk type\n",
986 (unsigned long long) min_md_device_sectors);
987 goto fail;
988 }
989
990 /* Make sure the new disk is big enough
991 * (we may currently be R_PRIMARY with no local disk...) */
992 if (drbd_get_max_capacity(nbc) <
993 drbd_get_capacity(mdev->this_bdev)) {
994 retcode = ERR_DISK_TO_SMALL;
995 goto fail;
996 }
997
998 nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
999
1000 if (nbc->known_size > max_possible_sectors) {
1001 dev_warn(DEV, "==> truncating very big lower level device "
1002 "to currently maximum possible %llu sectors <==\n",
1003 (unsigned long long) max_possible_sectors);
1004 if (nbc->dc.meta_dev_idx >= 0)
1005 dev_warn(DEV, "==>> using internal or flexible "
1006 "meta data may help <<==\n");
1007 }
1008
1009 drbd_suspend_io(mdev);
1010 /* also wait for the last barrier ack. */
1011 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt) || is_susp(mdev->state));
1012 /* and for any other previously queued work */
1013 drbd_flush_workqueue(mdev);
1014
1015 rv = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
1016 retcode = rv; /* FIXME: Type mismatch. */
1017 drbd_resume_io(mdev);
1018 if (rv < SS_SUCCESS)
1019 goto fail;
1020
1021 if (!get_ldev_if_state(mdev, D_ATTACHING))
1022 goto force_diskless;
1023
1024 drbd_md_set_sector_offsets(mdev, nbc);
1025
1026 /* allocate a second IO page if logical_block_size != 512 */
1027 logical_block_size = bdev_logical_block_size(nbc->md_bdev);
1028 if (logical_block_size == 0)
1029 logical_block_size = MD_SECTOR_SIZE;
1030
1031 if (logical_block_size != MD_SECTOR_SIZE) {
1032 if (!mdev->md_io_tmpp) {
1033 struct page *page = alloc_page(GFP_NOIO);
1034 if (!page)
1035 goto force_diskless_dec;
1036
1037 dev_warn(DEV, "Meta data's bdev logical_block_size = %d != %d\n",
1038 logical_block_size, MD_SECTOR_SIZE);
1039 dev_warn(DEV, "Workaround engaged (has performance impact).\n");
1040
1041 mdev->md_io_tmpp = page;
1042 }
1043 }
1044
1045 if (!mdev->bitmap) {
1046 if (drbd_bm_init(mdev)) {
1047 retcode = ERR_NOMEM;
1048 goto force_diskless_dec;
1049 }
1050 }
1051
1052 retcode = drbd_md_read(mdev, nbc);
1053 if (retcode != NO_ERROR)
1054 goto force_diskless_dec;
1055
1056 if (mdev->state.conn < C_CONNECTED &&
1057 mdev->state.role == R_PRIMARY &&
1058 (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
1059 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
1060 (unsigned long long)mdev->ed_uuid);
1061 retcode = ERR_DATA_NOT_CURRENT;
1062 goto force_diskless_dec;
1063 }
1064
1065 /* Since we are diskless, fix the activity log first... */
1066 if (drbd_check_al_size(mdev)) {
1067 retcode = ERR_NOMEM;
1068 goto force_diskless_dec;
1069 }
1070
1071 /* Prevent shrinking of consistent devices ! */
1072 if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
1073 drbd_new_dev_size(mdev, nbc, 0) < nbc->md.la_size_sect) {
1074 dev_warn(DEV, "refusing to truncate a consistent device\n");
1075 retcode = ERR_DISK_TO_SMALL;
1076 goto force_diskless_dec;
1077 }
1078
1079 if (!drbd_al_read_log(mdev, nbc)) {
1080 retcode = ERR_IO_MD_DISK;
1081 goto force_diskless_dec;
1082 }
1083
1084 /* Reset the "barriers don't work" bits here, then force meta data to
1085 * be written, to ensure we determine if barriers are supported. */
1086 if (nbc->dc.no_md_flush)
1087 set_bit(MD_NO_FUA, &mdev->flags);
1088 else
1089 clear_bit(MD_NO_FUA, &mdev->flags);
1090
1091 /* Point of no return reached.
1092 * Devices and memory are no longer released by error cleanup below.
1093 * now mdev takes over responsibility, and the state engine should
1094 * clean it up somewhere. */
1095 D_ASSERT(mdev->ldev == NULL);
1096 mdev->ldev = nbc;
1097 mdev->resync = resync_lru;
1098 nbc = NULL;
1099 resync_lru = NULL;
1100
1101 mdev->write_ordering = WO_bdev_flush;
1102 drbd_bump_write_ordering(mdev, WO_bdev_flush);
1103
1104 if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
1105 set_bit(CRASHED_PRIMARY, &mdev->flags);
1106 else
1107 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1108
1109 if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1110 !(mdev->state.role == R_PRIMARY && mdev->state.susp_nod)) {
1111 set_bit(CRASHED_PRIMARY, &mdev->flags);
1112 cp_discovered = 1;
1113 }
1114
1115 mdev->send_cnt = 0;
1116 mdev->recv_cnt = 0;
1117 mdev->read_cnt = 0;
1118 mdev->writ_cnt = 0;
1119
1120 max_bio_size = DRBD_MAX_BIO_SIZE;
1121 if (mdev->state.conn == C_CONNECTED) {
1122 /* We are Primary, Connected, and now attach a new local
1123 * backing store. We must not increase the user visible maximum
1124 * bio size on this device to something the peer may not be
1125 * able to handle. */
1126 if (mdev->agreed_pro_version < 94)
1127 max_bio_size = queue_max_hw_sectors(mdev->rq_queue) << 9;
1128 else if (mdev->agreed_pro_version == 94)
1129 max_bio_size = DRBD_MAX_SIZE_H80_PACKET;
1130 /* else: drbd 8.3.9 and later, stay with default */
1131 }
1132
1133 drbd_setup_queue_param(mdev, max_bio_size);
1134
1135 /* If I am currently not R_PRIMARY,
1136 * but meta data primary indicator is set,
1137 * I just now recover from a hard crash,
1138 * and have been R_PRIMARY before that crash.
1139 *
1140 * Now, if I had no connection before that crash
1141 * (have been degraded R_PRIMARY), chances are that
1142 * I won't find my peer now either.
1143 *
1144 * In that case, and _only_ in that case,
1145 * we use the degr-wfc-timeout instead of the default,
1146 * so we can automatically recover from a crash of a
1147 * degraded but active "cluster" after a certain timeout.
1148 */
1149 clear_bit(USE_DEGR_WFC_T, &mdev->flags);
1150 if (mdev->state.role != R_PRIMARY &&
1151 drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1152 !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
1153 set_bit(USE_DEGR_WFC_T, &mdev->flags);
1154
1155 dd = drbd_determin_dev_size(mdev, 0);
1156 if (dd == dev_size_error) {
1157 retcode = ERR_NOMEM_BITMAP;
1158 goto force_diskless_dec;
1159 } else if (dd == grew)
1160 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
1161
1162 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
1163 dev_info(DEV, "Assuming that all blocks are out of sync "
1164 "(aka FullSync)\n");
1165 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write,
1166 "set_n_write from attaching", BM_LOCKED_MASK)) {
1167 retcode = ERR_IO_MD_DISK;
1168 goto force_diskless_dec;
1169 }
1170 } else {
1171 if (drbd_bitmap_io(mdev, &drbd_bm_read,
1172 "read from attaching", BM_LOCKED_MASK) < 0) {
1173 retcode = ERR_IO_MD_DISK;
1174 goto force_diskless_dec;
1175 }
1176 }
1177
1178 if (cp_discovered) {
1179 drbd_al_apply_to_bm(mdev);
1180 if (drbd_bitmap_io(mdev, &drbd_bm_write,
1181 "crashed primary apply AL", BM_LOCKED_MASK)) {
1182 retcode = ERR_IO_MD_DISK;
1183 goto force_diskless_dec;
1184 }
1185 }
1186
1187 if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev))
1188 drbd_suspend_al(mdev); /* IO is still suspended here... */
1189
1190 spin_lock_irq(&mdev->req_lock);
1191 os = mdev->state;
1192 ns.i = os.i;
1193 /* If MDF_CONSISTENT is not set go into inconsistent state,
1194 otherwise investigate MDF_WasUpToDate...
1195 If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1196 otherwise into D_CONSISTENT state.
1197 */
1198 if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
1199 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
1200 ns.disk = D_CONSISTENT;
1201 else
1202 ns.disk = D_OUTDATED;
1203 } else {
1204 ns.disk = D_INCONSISTENT;
1205 }
1206
1207 if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
1208 ns.pdsk = D_OUTDATED;
1209
1210 if ( ns.disk == D_CONSISTENT &&
1211 (ns.pdsk == D_OUTDATED || mdev->ldev->dc.fencing == FP_DONT_CARE))
1212 ns.disk = D_UP_TO_DATE;
1213
1214 /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1215 MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1216 this point, because drbd_request_state() modifies these
1217 flags. */
1218
1219 /* In case we are C_CONNECTED postpone any decision on the new disk
1220 state after the negotiation phase. */
1221 if (mdev->state.conn == C_CONNECTED) {
1222 mdev->new_state_tmp.i = ns.i;
1223 ns.i = os.i;
1224 ns.disk = D_NEGOTIATING;
1225
1226 /* We expect to receive up-to-date UUIDs soon.
1227 To avoid a race in receive_state, free p_uuid while
1228 holding req_lock. I.e. atomic with the state change */
1229 kfree(mdev->p_uuid);
1230 mdev->p_uuid = NULL;
1231 }
1232
1233 rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
1234 ns = mdev->state;
1235 spin_unlock_irq(&mdev->req_lock);
1236
1237 if (rv < SS_SUCCESS)
1238 goto force_diskless_dec;
1239
1240 if (mdev->state.role == R_PRIMARY)
1241 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
1242 else
1243 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1244
1245 drbd_md_mark_dirty(mdev);
1246 drbd_md_sync(mdev);
1247
1248 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1249 put_ldev(mdev);
1250 reply->ret_code = retcode;
1251 drbd_reconfig_done(mdev);
1252 return 0;
1253
1254 force_diskless_dec:
1255 put_ldev(mdev);
1256 force_diskless:
1257 drbd_force_state(mdev, NS(disk, D_FAILED));
1258 drbd_md_sync(mdev);
1259 fail:
1260 if (nbc) {
1261 if (nbc->backing_bdev)
1262 blkdev_put(nbc->backing_bdev,
1263 FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1264 if (nbc->md_bdev)
1265 blkdev_put(nbc->md_bdev,
1266 FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1267 kfree(nbc);
1268 }
1269 lc_destroy(resync_lru);
1270
1271 reply->ret_code = retcode;
1272 drbd_reconfig_done(mdev);
1273 return 0;
1274 }
1275
1276 /* Detaching the disk is a process in multiple stages. First we need to lock
1277 * out application IO, in-flight IO, IO stuck in drbd_al_begin_io.
1278 * Then we transition to D_DISKLESS, and wait for put_ldev() to return all
1279 * internal references as well.
1280 * Only then we have finally detached. */
1281 static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1282 struct drbd_nl_cfg_reply *reply)
1283 {
1284 drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */
1285 reply->ret_code = drbd_request_state(mdev, NS(disk, D_DISKLESS));
1286 if (mdev->state.disk == D_DISKLESS)
1287 wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt));
1288 drbd_resume_io(mdev);
1289 return 0;
1290 }
1291
1292 static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1293 struct drbd_nl_cfg_reply *reply)
1294 {
1295 int i, ns;
1296 enum drbd_ret_code retcode;
1297 struct net_conf *new_conf = NULL;
1298 struct crypto_hash *tfm = NULL;
1299 struct crypto_hash *integrity_w_tfm = NULL;
1300 struct crypto_hash *integrity_r_tfm = NULL;
1301 struct hlist_head *new_tl_hash = NULL;
1302 struct hlist_head *new_ee_hash = NULL;
1303 struct drbd_conf *odev;
1304 char hmac_name[CRYPTO_MAX_ALG_NAME];
1305 void *int_dig_out = NULL;
1306 void *int_dig_in = NULL;
1307 void *int_dig_vv = NULL;
1308 struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr;
1309
1310 drbd_reconfig_start(mdev);
1311
1312 if (mdev->state.conn > C_STANDALONE) {
1313 retcode = ERR_NET_CONFIGURED;
1314 goto fail;
1315 }
1316
1317 /* allocation not in the IO path, cqueue thread context */
1318 new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
1319 if (!new_conf) {
1320 retcode = ERR_NOMEM;
1321 goto fail;
1322 }
1323
1324 new_conf->timeout = DRBD_TIMEOUT_DEF;
1325 new_conf->try_connect_int = DRBD_CONNECT_INT_DEF;
1326 new_conf->ping_int = DRBD_PING_INT_DEF;
1327 new_conf->max_epoch_size = DRBD_MAX_EPOCH_SIZE_DEF;
1328 new_conf->max_buffers = DRBD_MAX_BUFFERS_DEF;
1329 new_conf->unplug_watermark = DRBD_UNPLUG_WATERMARK_DEF;
1330 new_conf->sndbuf_size = DRBD_SNDBUF_SIZE_DEF;
1331 new_conf->rcvbuf_size = DRBD_RCVBUF_SIZE_DEF;
1332 new_conf->ko_count = DRBD_KO_COUNT_DEF;
1333 new_conf->after_sb_0p = DRBD_AFTER_SB_0P_DEF;
1334 new_conf->after_sb_1p = DRBD_AFTER_SB_1P_DEF;
1335 new_conf->after_sb_2p = DRBD_AFTER_SB_2P_DEF;
1336 new_conf->want_lose = 0;
1337 new_conf->two_primaries = 0;
1338 new_conf->wire_protocol = DRBD_PROT_C;
1339 new_conf->ping_timeo = DRBD_PING_TIMEO_DEF;
1340 new_conf->rr_conflict = DRBD_RR_CONFLICT_DEF;
1341 new_conf->on_congestion = DRBD_ON_CONGESTION_DEF;
1342 new_conf->cong_extents = DRBD_CONG_EXTENTS_DEF;
1343
1344 if (!net_conf_from_tags(mdev, nlp->tag_list, new_conf)) {
1345 retcode = ERR_MANDATORY_TAG;
1346 goto fail;
1347 }
1348
1349 if (new_conf->two_primaries
1350 && (new_conf->wire_protocol != DRBD_PROT_C)) {
1351 retcode = ERR_NOT_PROTO_C;
1352 goto fail;
1353 }
1354
1355 if (get_ldev(mdev)) {
1356 enum drbd_fencing_p fp = mdev->ldev->dc.fencing;
1357 put_ldev(mdev);
1358 if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH) {
1359 retcode = ERR_STONITH_AND_PROT_A;
1360 goto fail;
1361 }
1362 }
1363
1364 if (new_conf->on_congestion != OC_BLOCK && new_conf->wire_protocol != DRBD_PROT_A) {
1365 retcode = ERR_CONG_NOT_PROTO_A;
1366 goto fail;
1367 }
1368
1369 if (mdev->state.role == R_PRIMARY && new_conf->want_lose) {
1370 retcode = ERR_DISCARD;
1371 goto fail;
1372 }
1373
1374 retcode = NO_ERROR;
1375
1376 new_my_addr = (struct sockaddr *)&new_conf->my_addr;
1377 new_peer_addr = (struct sockaddr *)&new_conf->peer_addr;
1378 for (i = 0; i < minor_count; i++) {
1379 odev = minor_to_mdev(i);
1380 if (!odev || odev == mdev)
1381 continue;
1382 if (get_net_conf(odev)) {
1383 taken_addr = (struct sockaddr *)&odev->net_conf->my_addr;
1384 if (new_conf->my_addr_len == odev->net_conf->my_addr_len &&
1385 !memcmp(new_my_addr, taken_addr, new_conf->my_addr_len))
1386 retcode = ERR_LOCAL_ADDR;
1387
1388 taken_addr = (struct sockaddr *)&odev->net_conf->peer_addr;
1389 if (new_conf->peer_addr_len == odev->net_conf->peer_addr_len &&
1390 !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len))
1391 retcode = ERR_PEER_ADDR;
1392
1393 put_net_conf(odev);
1394 if (retcode != NO_ERROR)
1395 goto fail;
1396 }
1397 }
1398
1399 if (new_conf->cram_hmac_alg[0] != 0) {
1400 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
1401 new_conf->cram_hmac_alg);
1402 tfm = crypto_alloc_hash(hmac_name, 0, CRYPTO_ALG_ASYNC);
1403 if (IS_ERR(tfm)) {
1404 tfm = NULL;
1405 retcode = ERR_AUTH_ALG;
1406 goto fail;
1407 }
1408
1409 if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) {
1410 retcode = ERR_AUTH_ALG_ND;
1411 goto fail;
1412 }
1413 }
1414
1415 if (new_conf->integrity_alg[0]) {
1416 integrity_w_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1417 if (IS_ERR(integrity_w_tfm)) {
1418 integrity_w_tfm = NULL;
1419 retcode=ERR_INTEGRITY_ALG;
1420 goto fail;
1421 }
1422
1423 if (!drbd_crypto_is_hash(crypto_hash_tfm(integrity_w_tfm))) {
1424 retcode=ERR_INTEGRITY_ALG_ND;
1425 goto fail;
1426 }
1427
1428 integrity_r_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1429 if (IS_ERR(integrity_r_tfm)) {
1430 integrity_r_tfm = NULL;
1431 retcode=ERR_INTEGRITY_ALG;
1432 goto fail;
1433 }
1434 }
1435
1436 ns = new_conf->max_epoch_size/8;
1437 if (mdev->tl_hash_s != ns) {
1438 new_tl_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
1439 if (!new_tl_hash) {
1440 retcode = ERR_NOMEM;
1441 goto fail;
1442 }
1443 }
1444
1445 ns = new_conf->max_buffers/8;
1446 if (new_conf->two_primaries && (mdev->ee_hash_s != ns)) {
1447 new_ee_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
1448 if (!new_ee_hash) {
1449 retcode = ERR_NOMEM;
1450 goto fail;
1451 }
1452 }
1453
1454 ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
1455
1456 if (integrity_w_tfm) {
1457 i = crypto_hash_digestsize(integrity_w_tfm);
1458 int_dig_out = kmalloc(i, GFP_KERNEL);
1459 if (!int_dig_out) {
1460 retcode = ERR_NOMEM;
1461 goto fail;
1462 }
1463 int_dig_in = kmalloc(i, GFP_KERNEL);
1464 if (!int_dig_in) {
1465 retcode = ERR_NOMEM;
1466 goto fail;
1467 }
1468 int_dig_vv = kmalloc(i, GFP_KERNEL);
1469 if (!int_dig_vv) {
1470 retcode = ERR_NOMEM;
1471 goto fail;
1472 }
1473 }
1474
1475 if (!mdev->bitmap) {
1476 if(drbd_bm_init(mdev)) {
1477 retcode = ERR_NOMEM;
1478 goto fail;
1479 }
1480 }
1481
1482 drbd_flush_workqueue(mdev);
1483 spin_lock_irq(&mdev->req_lock);
1484 if (mdev->net_conf != NULL) {
1485 retcode = ERR_NET_CONFIGURED;
1486 spin_unlock_irq(&mdev->req_lock);
1487 goto fail;
1488 }
1489 mdev->net_conf = new_conf;
1490
1491 mdev->send_cnt = 0;
1492 mdev->recv_cnt = 0;
1493
1494 if (new_tl_hash) {
1495 kfree(mdev->tl_hash);
1496 mdev->tl_hash_s = mdev->net_conf->max_epoch_size/8;
1497 mdev->tl_hash = new_tl_hash;
1498 }
1499
1500 if (new_ee_hash) {
1501 kfree(mdev->ee_hash);
1502 mdev->ee_hash_s = mdev->net_conf->max_buffers/8;
1503 mdev->ee_hash = new_ee_hash;
1504 }
1505
1506 crypto_free_hash(mdev->cram_hmac_tfm);
1507 mdev->cram_hmac_tfm = tfm;
1508
1509 crypto_free_hash(mdev->integrity_w_tfm);
1510 mdev->integrity_w_tfm = integrity_w_tfm;
1511
1512 crypto_free_hash(mdev->integrity_r_tfm);
1513 mdev->integrity_r_tfm = integrity_r_tfm;
1514
1515 kfree(mdev->int_dig_out);
1516 kfree(mdev->int_dig_in);
1517 kfree(mdev->int_dig_vv);
1518 mdev->int_dig_out=int_dig_out;
1519 mdev->int_dig_in=int_dig_in;
1520 mdev->int_dig_vv=int_dig_vv;
1521 retcode = _drbd_set_state(_NS(mdev, conn, C_UNCONNECTED), CS_VERBOSE, NULL);
1522 spin_unlock_irq(&mdev->req_lock);
1523
1524 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1525 reply->ret_code = retcode;
1526 drbd_reconfig_done(mdev);
1527 return 0;
1528
1529 fail:
1530 kfree(int_dig_out);
1531 kfree(int_dig_in);
1532 kfree(int_dig_vv);
1533 crypto_free_hash(tfm);
1534 crypto_free_hash(integrity_w_tfm);
1535 crypto_free_hash(integrity_r_tfm);
1536 kfree(new_tl_hash);
1537 kfree(new_ee_hash);
1538 kfree(new_conf);
1539
1540 reply->ret_code = retcode;
1541 drbd_reconfig_done(mdev);
1542 return 0;
1543 }
1544
1545 static int drbd_nl_disconnect(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1546 struct drbd_nl_cfg_reply *reply)
1547 {
1548 int retcode;
1549 struct disconnect dc;
1550
1551 memset(&dc, 0, sizeof(struct disconnect));
1552 if (!disconnect_from_tags(mdev, nlp->tag_list, &dc)) {
1553 retcode = ERR_MANDATORY_TAG;
1554 goto fail;
1555 }
1556
1557 if (dc.force) {
1558 spin_lock_irq(&mdev->req_lock);
1559 if (mdev->state.conn >= C_WF_CONNECTION)
1560 _drbd_set_state(_NS(mdev, conn, C_DISCONNECTING), CS_HARD, NULL);
1561 spin_unlock_irq(&mdev->req_lock);
1562 goto done;
1563 }
1564
1565 retcode = _drbd_request_state(mdev, NS(conn, C_DISCONNECTING), CS_ORDERED);
1566
1567 if (retcode == SS_NOTHING_TO_DO)
1568 goto done;
1569 else if (retcode == SS_ALREADY_STANDALONE)
1570 goto done;
1571 else if (retcode == SS_PRIMARY_NOP) {
1572 /* Our statche checking code wants to see the peer outdated. */
1573 retcode = drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
1574 pdsk, D_OUTDATED));
1575 } else if (retcode == SS_CW_FAILED_BY_PEER) {
1576 /* The peer probably wants to see us outdated. */
1577 retcode = _drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
1578 disk, D_OUTDATED),
1579 CS_ORDERED);
1580 if (retcode == SS_IS_DISKLESS || retcode == SS_LOWER_THAN_OUTDATED) {
1581 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
1582 retcode = SS_SUCCESS;
1583 }
1584 }
1585
1586 if (retcode < SS_SUCCESS)
1587 goto fail;
1588
1589 if (wait_event_interruptible(mdev->state_wait,
1590 mdev->state.conn != C_DISCONNECTING)) {
1591 /* Do not test for mdev->state.conn == C_STANDALONE, since
1592 someone else might connect us in the mean time! */
1593 retcode = ERR_INTR;
1594 goto fail;
1595 }
1596
1597 done:
1598 retcode = NO_ERROR;
1599 fail:
1600 drbd_md_sync(mdev);
1601 reply->ret_code = retcode;
1602 return 0;
1603 }
1604
1605 void resync_after_online_grow(struct drbd_conf *mdev)
1606 {
1607 int iass; /* I am sync source */
1608
1609 dev_info(DEV, "Resync of new storage after online grow\n");
1610 if (mdev->state.role != mdev->state.peer)
1611 iass = (mdev->state.role == R_PRIMARY);
1612 else
1613 iass = test_bit(DISCARD_CONCURRENT, &mdev->flags);
1614
1615 if (iass)
1616 drbd_start_resync(mdev, C_SYNC_SOURCE);
1617 else
1618 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
1619 }
1620
1621 static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1622 struct drbd_nl_cfg_reply *reply)
1623 {
1624 struct resize rs;
1625 int retcode = NO_ERROR;
1626 enum determine_dev_size dd;
1627 enum dds_flags ddsf;
1628
1629 memset(&rs, 0, sizeof(struct resize));
1630 if (!resize_from_tags(mdev, nlp->tag_list, &rs)) {
1631 retcode = ERR_MANDATORY_TAG;
1632 goto fail;
1633 }
1634
1635 if (mdev->state.conn > C_CONNECTED) {
1636 retcode = ERR_RESIZE_RESYNC;
1637 goto fail;
1638 }
1639
1640 if (mdev->state.role == R_SECONDARY &&
1641 mdev->state.peer == R_SECONDARY) {
1642 retcode = ERR_NO_PRIMARY;
1643 goto fail;
1644 }
1645
1646 if (!get_ldev(mdev)) {
1647 retcode = ERR_NO_DISK;
1648 goto fail;
1649 }
1650
1651 if (rs.no_resync && mdev->agreed_pro_version < 93) {
1652 retcode = ERR_NEED_APV_93;
1653 goto fail;
1654 }
1655
1656 if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev))
1657 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
1658
1659 mdev->ldev->dc.disk_size = (sector_t)rs.resize_size;
1660 ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
1661 dd = drbd_determin_dev_size(mdev, ddsf);
1662 drbd_md_sync(mdev);
1663 put_ldev(mdev);
1664 if (dd == dev_size_error) {
1665 retcode = ERR_NOMEM_BITMAP;
1666 goto fail;
1667 }
1668
1669 if (mdev->state.conn == C_CONNECTED) {
1670 if (dd == grew)
1671 set_bit(RESIZE_PENDING, &mdev->flags);
1672
1673 drbd_send_uuids(mdev);
1674 drbd_send_sizes(mdev, 1, ddsf);
1675 }
1676
1677 fail:
1678 reply->ret_code = retcode;
1679 return 0;
1680 }
1681
1682 static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1683 struct drbd_nl_cfg_reply *reply)
1684 {
1685 int retcode = NO_ERROR;
1686 int err;
1687 int ovr; /* online verify running */
1688 int rsr; /* re-sync running */
1689 struct crypto_hash *verify_tfm = NULL;
1690 struct crypto_hash *csums_tfm = NULL;
1691 struct syncer_conf sc;
1692 cpumask_var_t new_cpu_mask;
1693 int *rs_plan_s = NULL;
1694 int fifo_size;
1695
1696 if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) {
1697 retcode = ERR_NOMEM;
1698 goto fail;
1699 }
1700
1701 if (nlp->flags & DRBD_NL_SET_DEFAULTS) {
1702 memset(&sc, 0, sizeof(struct syncer_conf));
1703 sc.rate = DRBD_RATE_DEF;
1704 sc.after = DRBD_AFTER_DEF;
1705 sc.al_extents = DRBD_AL_EXTENTS_DEF;
1706 sc.on_no_data = DRBD_ON_NO_DATA_DEF;
1707 sc.c_plan_ahead = DRBD_C_PLAN_AHEAD_DEF;
1708 sc.c_delay_target = DRBD_C_DELAY_TARGET_DEF;
1709 sc.c_fill_target = DRBD_C_FILL_TARGET_DEF;
1710 sc.c_max_rate = DRBD_C_MAX_RATE_DEF;
1711 sc.c_min_rate = DRBD_C_MIN_RATE_DEF;
1712 } else
1713 memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf));
1714
1715 if (!syncer_conf_from_tags(mdev, nlp->tag_list, &sc)) {
1716 retcode = ERR_MANDATORY_TAG;
1717 goto fail;
1718 }
1719
1720 /* re-sync running */
1721 rsr = ( mdev->state.conn == C_SYNC_SOURCE ||
1722 mdev->state.conn == C_SYNC_TARGET ||
1723 mdev->state.conn == C_PAUSED_SYNC_S ||
1724 mdev->state.conn == C_PAUSED_SYNC_T );
1725
1726 if (rsr && strcmp(sc.csums_alg, mdev->sync_conf.csums_alg)) {
1727 retcode = ERR_CSUMS_RESYNC_RUNNING;
1728 goto fail;
1729 }
1730
1731 if (!rsr && sc.csums_alg[0]) {
1732 csums_tfm = crypto_alloc_hash(sc.csums_alg, 0, CRYPTO_ALG_ASYNC);
1733 if (IS_ERR(csums_tfm)) {
1734 csums_tfm = NULL;
1735 retcode = ERR_CSUMS_ALG;
1736 goto fail;
1737 }
1738
1739 if (!drbd_crypto_is_hash(crypto_hash_tfm(csums_tfm))) {
1740 retcode = ERR_CSUMS_ALG_ND;
1741 goto fail;
1742 }
1743 }
1744
1745 /* online verify running */
1746 ovr = (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T);
1747
1748 if (ovr) {
1749 if (strcmp(sc.verify_alg, mdev->sync_conf.verify_alg)) {
1750 retcode = ERR_VERIFY_RUNNING;
1751 goto fail;
1752 }
1753 }
1754
1755 if (!ovr && sc.verify_alg[0]) {
1756 verify_tfm = crypto_alloc_hash(sc.verify_alg, 0, CRYPTO_ALG_ASYNC);
1757 if (IS_ERR(verify_tfm)) {
1758 verify_tfm = NULL;
1759 retcode = ERR_VERIFY_ALG;
1760 goto fail;
1761 }
1762
1763 if (!drbd_crypto_is_hash(crypto_hash_tfm(verify_tfm))) {
1764 retcode = ERR_VERIFY_ALG_ND;
1765 goto fail;
1766 }
1767 }
1768
1769 /* silently ignore cpu mask on UP kernel */
1770 if (nr_cpu_ids > 1 && sc.cpu_mask[0] != 0) {
1771 err = __bitmap_parse(sc.cpu_mask, 32, 0,
1772 cpumask_bits(new_cpu_mask), nr_cpu_ids);
1773 if (err) {
1774 dev_warn(DEV, "__bitmap_parse() failed with %d\n", err);
1775 retcode = ERR_CPU_MASK_PARSE;
1776 goto fail;
1777 }
1778 }
1779
1780 ERR_IF (sc.rate < 1) sc.rate = 1;
1781 ERR_IF (sc.al_extents < 7) sc.al_extents = 127; /* arbitrary minimum */
1782 #define AL_MAX ((MD_AL_MAX_SIZE-1) * AL_EXTENTS_PT)
1783 if (sc.al_extents > AL_MAX) {
1784 dev_err(DEV, "sc.al_extents > %d\n", AL_MAX);
1785 sc.al_extents = AL_MAX;
1786 }
1787 #undef AL_MAX
1788
1789 /* to avoid spurious errors when configuring minors before configuring
1790 * the minors they depend on: if necessary, first create the minor we
1791 * depend on */
1792 if (sc.after >= 0)
1793 ensure_mdev(sc.after, 1);
1794
1795 /* most sanity checks done, try to assign the new sync-after
1796 * dependency. need to hold the global lock in there,
1797 * to avoid a race in the dependency loop check. */
1798 retcode = drbd_alter_sa(mdev, sc.after);
1799 if (retcode != NO_ERROR)
1800 goto fail;
1801
1802 fifo_size = (sc.c_plan_ahead * 10 * SLEEP_TIME) / HZ;
1803 if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) {
1804 rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL);
1805 if (!rs_plan_s) {
1806 dev_err(DEV, "kmalloc of fifo_buffer failed");
1807 retcode = ERR_NOMEM;
1808 goto fail;
1809 }
1810 }
1811
1812 /* ok, assign the rest of it as well.
1813 * lock against receive_SyncParam() */
1814 spin_lock(&mdev->peer_seq_lock);
1815 mdev->sync_conf = sc;
1816
1817 if (!rsr) {
1818 crypto_free_hash(mdev->csums_tfm);
1819 mdev->csums_tfm = csums_tfm;
1820 csums_tfm = NULL;
1821 }
1822
1823 if (!ovr) {
1824 crypto_free_hash(mdev->verify_tfm);
1825 mdev->verify_tfm = verify_tfm;
1826 verify_tfm = NULL;
1827 }
1828
1829 if (fifo_size != mdev->rs_plan_s.size) {
1830 kfree(mdev->rs_plan_s.values);
1831 mdev->rs_plan_s.values = rs_plan_s;
1832 mdev->rs_plan_s.size = fifo_size;
1833 mdev->rs_planed = 0;
1834 rs_plan_s = NULL;
1835 }
1836
1837 spin_unlock(&mdev->peer_seq_lock);
1838
1839 if (get_ldev(mdev)) {
1840 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
1841 drbd_al_shrink(mdev);
1842 err = drbd_check_al_size(mdev);
1843 lc_unlock(mdev->act_log);
1844 wake_up(&mdev->al_wait);
1845
1846 put_ldev(mdev);
1847 drbd_md_sync(mdev);
1848
1849 if (err) {
1850 retcode = ERR_NOMEM;
1851 goto fail;
1852 }
1853 }
1854
1855 if (mdev->state.conn >= C_CONNECTED)
1856 drbd_send_sync_param(mdev, &sc);
1857
1858 if (!cpumask_equal(mdev->cpu_mask, new_cpu_mask)) {
1859 cpumask_copy(mdev->cpu_mask, new_cpu_mask);
1860 drbd_calc_cpu_mask(mdev);
1861 mdev->receiver.reset_cpu_mask = 1;
1862 mdev->asender.reset_cpu_mask = 1;
1863 mdev->worker.reset_cpu_mask = 1;
1864 }
1865
1866 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1867 fail:
1868 kfree(rs_plan_s);
1869 free_cpumask_var(new_cpu_mask);
1870 crypto_free_hash(csums_tfm);
1871 crypto_free_hash(verify_tfm);
1872 reply->ret_code = retcode;
1873 return 0;
1874 }
1875
1876 static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1877 struct drbd_nl_cfg_reply *reply)
1878 {
1879 int retcode;
1880
1881 /* If there is still bitmap IO pending, probably because of a previous
1882 * resync just being finished, wait for it before requesting a new resync. */
1883 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
1884
1885 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
1886
1887 if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
1888 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1889
1890 while (retcode == SS_NEED_CONNECTION) {
1891 spin_lock_irq(&mdev->req_lock);
1892 if (mdev->state.conn < C_CONNECTED)
1893 retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL);
1894 spin_unlock_irq(&mdev->req_lock);
1895
1896 if (retcode != SS_NEED_CONNECTION)
1897 break;
1898
1899 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1900 }
1901
1902 reply->ret_code = retcode;
1903 return 0;
1904 }
1905
1906 static int drbd_bmio_set_susp_al(struct drbd_conf *mdev)
1907 {
1908 int rv;
1909
1910 rv = drbd_bmio_set_n_write(mdev);
1911 drbd_suspend_al(mdev);
1912 return rv;
1913 }
1914
1915 static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1916 struct drbd_nl_cfg_reply *reply)
1917 {
1918 int retcode;
1919
1920 /* If there is still bitmap IO pending, probably because of a previous
1921 * resync just being finished, wait for it before requesting a new resync. */
1922 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
1923
1924 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED);
1925
1926 if (retcode < SS_SUCCESS) {
1927 if (retcode == SS_NEED_CONNECTION && mdev->state.role == R_PRIMARY) {
1928 /* The peer will get a resync upon connect anyways. Just make that
1929 into a full resync. */
1930 retcode = drbd_request_state(mdev, NS(pdsk, D_INCONSISTENT));
1931 if (retcode >= SS_SUCCESS) {
1932 if (drbd_bitmap_io(mdev, &drbd_bmio_set_susp_al,
1933 "set_n_write from invalidate_peer",
1934 BM_LOCKED_SET_ALLOWED))
1935 retcode = ERR_IO_MD_DISK;
1936 }
1937 } else
1938 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
1939 }
1940
1941 reply->ret_code = retcode;
1942 return 0;
1943 }
1944
1945 static int drbd_nl_pause_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1946 struct drbd_nl_cfg_reply *reply)
1947 {
1948 int retcode = NO_ERROR;
1949
1950 if (drbd_request_state(mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
1951 retcode = ERR_PAUSE_IS_SET;
1952
1953 reply->ret_code = retcode;
1954 return 0;
1955 }
1956
1957 static int drbd_nl_resume_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1958 struct drbd_nl_cfg_reply *reply)
1959 {
1960 int retcode = NO_ERROR;
1961 union drbd_state s;
1962
1963 if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO) {
1964 s = mdev->state;
1965 if (s.conn == C_PAUSED_SYNC_S || s.conn == C_PAUSED_SYNC_T) {
1966 retcode = s.aftr_isp ? ERR_PIC_AFTER_DEP :
1967 s.peer_isp ? ERR_PIC_PEER_DEP : ERR_PAUSE_IS_CLEAR;
1968 } else {
1969 retcode = ERR_PAUSE_IS_CLEAR;
1970 }
1971 }
1972
1973 reply->ret_code = retcode;
1974 return 0;
1975 }
1976
1977 static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1978 struct drbd_nl_cfg_reply *reply)
1979 {
1980 reply->ret_code = drbd_request_state(mdev, NS(susp, 1));
1981
1982 return 0;
1983 }
1984
1985 static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1986 struct drbd_nl_cfg_reply *reply)
1987 {
1988 if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
1989 drbd_uuid_new_current(mdev);
1990 clear_bit(NEW_CUR_UUID, &mdev->flags);
1991 }
1992 drbd_suspend_io(mdev);
1993 reply->ret_code = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0));
1994 if (reply->ret_code == SS_SUCCESS) {
1995 if (mdev->state.conn < C_CONNECTED)
1996 tl_clear(mdev);
1997 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED)
1998 tl_restart(mdev, fail_frozen_disk_io);
1999 }
2000 drbd_resume_io(mdev);
2001
2002 return 0;
2003 }
2004
2005 static int drbd_nl_outdate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2006 struct drbd_nl_cfg_reply *reply)
2007 {
2008 reply->ret_code = drbd_request_state(mdev, NS(disk, D_OUTDATED));
2009 return 0;
2010 }
2011
2012 static int drbd_nl_get_config(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2013 struct drbd_nl_cfg_reply *reply)
2014 {
2015 unsigned short *tl;
2016
2017 tl = reply->tag_list;
2018
2019 if (get_ldev(mdev)) {
2020 tl = disk_conf_to_tags(mdev, &mdev->ldev->dc, tl);
2021 put_ldev(mdev);
2022 }
2023
2024 if (get_net_conf(mdev)) {
2025 tl = net_conf_to_tags(mdev, mdev->net_conf, tl);
2026 put_net_conf(mdev);
2027 }
2028 tl = syncer_conf_to_tags(mdev, &mdev->sync_conf, tl);
2029
2030 put_unaligned(TT_END, tl++); /* Close the tag list */
2031
2032 return (int)((char *)tl - (char *)reply->tag_list);
2033 }
2034
2035 static int drbd_nl_get_state(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2036 struct drbd_nl_cfg_reply *reply)
2037 {
2038 unsigned short *tl = reply->tag_list;
2039 union drbd_state s = mdev->state;
2040 unsigned long rs_left;
2041 unsigned int res;
2042
2043 tl = get_state_to_tags(mdev, (struct get_state *)&s, tl);
2044
2045 /* no local ref, no bitmap, no syncer progress. */
2046 if (s.conn >= C_SYNC_SOURCE && s.conn <= C_PAUSED_SYNC_T) {
2047 if (get_ldev(mdev)) {
2048 drbd_get_syncer_progress(mdev, &rs_left, &res);
2049 tl = tl_add_int(tl, T_sync_progress, &res);
2050 put_ldev(mdev);
2051 }
2052 }
2053 put_unaligned(TT_END, tl++); /* Close the tag list */
2054
2055 return (int)((char *)tl - (char *)reply->tag_list);
2056 }
2057
2058 static int drbd_nl_get_uuids(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2059 struct drbd_nl_cfg_reply *reply)
2060 {
2061 unsigned short *tl;
2062
2063 tl = reply->tag_list;
2064
2065 if (get_ldev(mdev)) {
2066 tl = tl_add_blob(tl, T_uuids, mdev->ldev->md.uuid, UI_SIZE*sizeof(u64));
2067 tl = tl_add_int(tl, T_uuids_flags, &mdev->ldev->md.flags);
2068 put_ldev(mdev);
2069 }
2070 put_unaligned(TT_END, tl++); /* Close the tag list */
2071
2072 return (int)((char *)tl - (char *)reply->tag_list);
2073 }
2074
2075 /**
2076 * drbd_nl_get_timeout_flag() - Used by drbdsetup to find out which timeout value to use
2077 * @mdev: DRBD device.
2078 * @nlp: Netlink/connector packet from drbdsetup
2079 * @reply: Reply packet for drbdsetup
2080 */
2081 static int drbd_nl_get_timeout_flag(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2082 struct drbd_nl_cfg_reply *reply)
2083 {
2084 unsigned short *tl;
2085 char rv;
2086
2087 tl = reply->tag_list;
2088
2089 rv = mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
2090 test_bit(USE_DEGR_WFC_T, &mdev->flags) ? UT_DEGRADED : UT_DEFAULT;
2091
2092 tl = tl_add_blob(tl, T_use_degraded, &rv, sizeof(rv));
2093 put_unaligned(TT_END, tl++); /* Close the tag list */
2094
2095 return (int)((char *)tl - (char *)reply->tag_list);
2096 }
2097
2098 static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2099 struct drbd_nl_cfg_reply *reply)
2100 {
2101 /* default to resume from last known position, if possible */
2102 struct start_ov args =
2103 { .start_sector = mdev->ov_start_sector };
2104
2105 if (!start_ov_from_tags(mdev, nlp->tag_list, &args)) {
2106 reply->ret_code = ERR_MANDATORY_TAG;
2107 return 0;
2108 }
2109
2110 /* If there is still bitmap IO pending, e.g. previous resync or verify
2111 * just being finished, wait for it before requesting a new resync. */
2112 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2113
2114 /* w_make_ov_request expects position to be aligned */
2115 mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT;
2116 reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
2117 return 0;
2118 }
2119
2120
2121 static int drbd_nl_new_c_uuid(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2122 struct drbd_nl_cfg_reply *reply)
2123 {
2124 int retcode = NO_ERROR;
2125 int skip_initial_sync = 0;
2126 int err;
2127
2128 struct new_c_uuid args;
2129
2130 memset(&args, 0, sizeof(struct new_c_uuid));
2131 if (!new_c_uuid_from_tags(mdev, nlp->tag_list, &args)) {
2132 reply->ret_code = ERR_MANDATORY_TAG;
2133 return 0;
2134 }
2135
2136 mutex_lock(&mdev->state_mutex); /* Protects us against serialized state changes. */
2137
2138 if (!get_ldev(mdev)) {
2139 retcode = ERR_NO_DISK;
2140 goto out;
2141 }
2142
2143 /* this is "skip initial sync", assume to be clean */
2144 if (mdev->state.conn == C_CONNECTED && mdev->agreed_pro_version >= 90 &&
2145 mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
2146 dev_info(DEV, "Preparing to skip initial sync\n");
2147 skip_initial_sync = 1;
2148 } else if (mdev->state.conn != C_STANDALONE) {
2149 retcode = ERR_CONNECTED;
2150 goto out_dec;
2151 }
2152
2153 drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
2154 drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
2155
2156 if (args.clear_bm) {
2157 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write,
2158 "clear_n_write from new_c_uuid", BM_LOCKED_MASK);
2159 if (err) {
2160 dev_err(DEV, "Writing bitmap failed with %d\n",err);
2161 retcode = ERR_IO_MD_DISK;
2162 }
2163 if (skip_initial_sync) {
2164 drbd_send_uuids_skip_initial_sync(mdev);
2165 _drbd_uuid_set(mdev, UI_BITMAP, 0);
2166 drbd_print_uuids(mdev, "cleared bitmap UUID");
2167 spin_lock_irq(&mdev->req_lock);
2168 _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
2169 CS_VERBOSE, NULL);
2170 spin_unlock_irq(&mdev->req_lock);
2171 }
2172 }
2173
2174 drbd_md_sync(mdev);
2175 out_dec:
2176 put_ldev(mdev);
2177 out:
2178 mutex_unlock(&mdev->state_mutex);
2179
2180 reply->ret_code = retcode;
2181 return 0;
2182 }
2183
2184 struct cn_handler_struct {
2185 int (*function)(struct drbd_conf *,
2186 struct drbd_nl_cfg_req *,
2187 struct drbd_nl_cfg_reply *);
2188 int reply_body_size;
2189 };
2190
2191 static struct cn_handler_struct cnd_table[] = {
2192 [ P_primary ] = { &drbd_nl_primary, 0 },
2193 [ P_secondary ] = { &drbd_nl_secondary, 0 },
2194 [ P_disk_conf ] = { &drbd_nl_disk_conf, 0 },
2195 [ P_detach ] = { &drbd_nl_detach, 0 },
2196 [ P_net_conf ] = { &drbd_nl_net_conf, 0 },
2197 [ P_disconnect ] = { &drbd_nl_disconnect, 0 },
2198 [ P_resize ] = { &drbd_nl_resize, 0 },
2199 [ P_syncer_conf ] = { &drbd_nl_syncer_conf, 0 },
2200 [ P_invalidate ] = { &drbd_nl_invalidate, 0 },
2201 [ P_invalidate_peer ] = { &drbd_nl_invalidate_peer, 0 },
2202 [ P_pause_sync ] = { &drbd_nl_pause_sync, 0 },
2203 [ P_resume_sync ] = { &drbd_nl_resume_sync, 0 },
2204 [ P_suspend_io ] = { &drbd_nl_suspend_io, 0 },
2205 [ P_resume_io ] = { &drbd_nl_resume_io, 0 },
2206 [ P_outdate ] = { &drbd_nl_outdate, 0 },
2207 [ P_get_config ] = { &drbd_nl_get_config,
2208 sizeof(struct syncer_conf_tag_len_struct) +
2209 sizeof(struct disk_conf_tag_len_struct) +
2210 sizeof(struct net_conf_tag_len_struct) },
2211 [ P_get_state ] = { &drbd_nl_get_state,
2212 sizeof(struct get_state_tag_len_struct) +
2213 sizeof(struct sync_progress_tag_len_struct) },
2214 [ P_get_uuids ] = { &drbd_nl_get_uuids,
2215 sizeof(struct get_uuids_tag_len_struct) },
2216 [ P_get_timeout_flag ] = { &drbd_nl_get_timeout_flag,
2217 sizeof(struct get_timeout_flag_tag_len_struct)},
2218 [ P_start_ov ] = { &drbd_nl_start_ov, 0 },
2219 [ P_new_c_uuid ] = { &drbd_nl_new_c_uuid, 0 },
2220 };
2221
2222 static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp)
2223 {
2224 struct drbd_nl_cfg_req *nlp = (struct drbd_nl_cfg_req *)req->data;
2225 struct cn_handler_struct *cm;
2226 struct cn_msg *cn_reply;
2227 struct drbd_nl_cfg_reply *reply;
2228 struct drbd_conf *mdev;
2229 int retcode, rr;
2230 int reply_size = sizeof(struct cn_msg)
2231 + sizeof(struct drbd_nl_cfg_reply)
2232 + sizeof(short int);
2233
2234 if (!try_module_get(THIS_MODULE)) {
2235 printk(KERN_ERR "drbd: try_module_get() failed!\n");
2236 return;
2237 }
2238
2239 if (!cap_raised(current_cap(), CAP_SYS_ADMIN)) {
2240 retcode = ERR_PERM;
2241 goto fail;
2242 }
2243
2244 mdev = ensure_mdev(nlp->drbd_minor,
2245 (nlp->flags & DRBD_NL_CREATE_DEVICE));
2246 if (!mdev) {
2247 retcode = ERR_MINOR_INVALID;
2248 goto fail;
2249 }
2250
2251 if (nlp->packet_type >= P_nl_after_last_packet ||
2252 nlp->packet_type == P_return_code_only) {
2253 retcode = ERR_PACKET_NR;
2254 goto fail;
2255 }
2256
2257 cm = cnd_table + nlp->packet_type;
2258
2259 /* This may happen if packet number is 0: */
2260 if (cm->function == NULL) {
2261 retcode = ERR_PACKET_NR;
2262 goto fail;
2263 }
2264
2265 reply_size += cm->reply_body_size;
2266
2267 /* allocation not in the IO path, cqueue thread context */
2268 cn_reply = kzalloc(reply_size, GFP_KERNEL);
2269 if (!cn_reply) {
2270 retcode = ERR_NOMEM;
2271 goto fail;
2272 }
2273 reply = (struct drbd_nl_cfg_reply *) cn_reply->data;
2274
2275 reply->packet_type =
2276 cm->reply_body_size ? nlp->packet_type : P_return_code_only;
2277 reply->minor = nlp->drbd_minor;
2278 reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */
2279 /* reply->tag_list; might be modified by cm->function. */
2280
2281 rr = cm->function(mdev, nlp, reply);
2282
2283 cn_reply->id = req->id;
2284 cn_reply->seq = req->seq;
2285 cn_reply->ack = req->ack + 1;
2286 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + rr;
2287 cn_reply->flags = 0;
2288
2289 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL);
2290 if (rr && rr != -ESRCH)
2291 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2292
2293 kfree(cn_reply);
2294 module_put(THIS_MODULE);
2295 return;
2296 fail:
2297 drbd_nl_send_reply(req, retcode);
2298 module_put(THIS_MODULE);
2299 }
2300
2301 static atomic_t drbd_nl_seq = ATOMIC_INIT(2); /* two. */
2302
2303 static unsigned short *
2304 __tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data,
2305 unsigned short len, int nul_terminated)
2306 {
2307 unsigned short l = tag_descriptions[tag_number(tag)].max_len;
2308 len = (len < l) ? len : l;
2309 put_unaligned(tag, tl++);
2310 put_unaligned(len, tl++);
2311 memcpy(tl, data, len);
2312 tl = (unsigned short*)((char*)tl + len);
2313 if (nul_terminated)
2314 *((char*)tl - 1) = 0;
2315 return tl;
2316 }
2317
2318 static unsigned short *
2319 tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, int len)
2320 {
2321 return __tl_add_blob(tl, tag, data, len, 0);
2322 }
2323
2324 static unsigned short *
2325 tl_add_str(unsigned short *tl, enum drbd_tags tag, const char *str)
2326 {
2327 return __tl_add_blob(tl, tag, str, strlen(str)+1, 0);
2328 }
2329
2330 static unsigned short *
2331 tl_add_int(unsigned short *tl, enum drbd_tags tag, const void *val)
2332 {
2333 put_unaligned(tag, tl++);
2334 switch(tag_type(tag)) {
2335 case TT_INTEGER:
2336 put_unaligned(sizeof(int), tl++);
2337 put_unaligned(*(int *)val, (int *)tl);
2338 tl = (unsigned short*)((char*)tl+sizeof(int));
2339 break;
2340 case TT_INT64:
2341 put_unaligned(sizeof(u64), tl++);
2342 put_unaligned(*(u64 *)val, (u64 *)tl);
2343 tl = (unsigned short*)((char*)tl+sizeof(u64));
2344 break;
2345 default:
2346 /* someone did something stupid. */
2347 ;
2348 }
2349 return tl;
2350 }
2351
2352 void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state state)
2353 {
2354 char buffer[sizeof(struct cn_msg)+
2355 sizeof(struct drbd_nl_cfg_reply)+
2356 sizeof(struct get_state_tag_len_struct)+
2357 sizeof(short int)];
2358 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2359 struct drbd_nl_cfg_reply *reply =
2360 (struct drbd_nl_cfg_reply *)cn_reply->data;
2361 unsigned short *tl = reply->tag_list;
2362
2363 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2364
2365 tl = get_state_to_tags(mdev, (struct get_state *)&state, tl);
2366
2367 put_unaligned(TT_END, tl++); /* Close the tag list */
2368
2369 cn_reply->id.idx = CN_IDX_DRBD;
2370 cn_reply->id.val = CN_VAL_DRBD;
2371
2372 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2373 cn_reply->ack = 0; /* not used here. */
2374 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2375 (int)((char *)tl - (char *)reply->tag_list);
2376 cn_reply->flags = 0;
2377
2378 reply->packet_type = P_get_state;
2379 reply->minor = mdev_to_minor(mdev);
2380 reply->ret_code = NO_ERROR;
2381
2382 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2383 }
2384
2385 void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name)
2386 {
2387 char buffer[sizeof(struct cn_msg)+
2388 sizeof(struct drbd_nl_cfg_reply)+
2389 sizeof(struct call_helper_tag_len_struct)+
2390 sizeof(short int)];
2391 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2392 struct drbd_nl_cfg_reply *reply =
2393 (struct drbd_nl_cfg_reply *)cn_reply->data;
2394 unsigned short *tl = reply->tag_list;
2395
2396 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2397
2398 tl = tl_add_str(tl, T_helper, helper_name);
2399 put_unaligned(TT_END, tl++); /* Close the tag list */
2400
2401 cn_reply->id.idx = CN_IDX_DRBD;
2402 cn_reply->id.val = CN_VAL_DRBD;
2403
2404 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2405 cn_reply->ack = 0; /* not used here. */
2406 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2407 (int)((char *)tl - (char *)reply->tag_list);
2408 cn_reply->flags = 0;
2409
2410 reply->packet_type = P_call_helper;
2411 reply->minor = mdev_to_minor(mdev);
2412 reply->ret_code = NO_ERROR;
2413
2414 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2415 }
2416
2417 void drbd_bcast_ee(struct drbd_conf *mdev,
2418 const char *reason, const int dgs,
2419 const char* seen_hash, const char* calc_hash,
2420 const struct drbd_epoch_entry* e)
2421 {
2422 struct cn_msg *cn_reply;
2423 struct drbd_nl_cfg_reply *reply;
2424 unsigned short *tl;
2425 struct page *page;
2426 unsigned len;
2427
2428 if (!e)
2429 return;
2430 if (!reason || !reason[0])
2431 return;
2432
2433 /* apparently we have to memcpy twice, first to prepare the data for the
2434 * struct cn_msg, then within cn_netlink_send from the cn_msg to the
2435 * netlink skb. */
2436 /* receiver thread context, which is not in the writeout path (of this node),
2437 * but may be in the writeout path of the _other_ node.
2438 * GFP_NOIO to avoid potential "distributed deadlock". */
2439 cn_reply = kzalloc(
2440 sizeof(struct cn_msg)+
2441 sizeof(struct drbd_nl_cfg_reply)+
2442 sizeof(struct dump_ee_tag_len_struct)+
2443 sizeof(short int),
2444 GFP_NOIO);
2445
2446 if (!cn_reply) {
2447 dev_err(DEV, "could not kmalloc buffer for drbd_bcast_ee, sector %llu, size %u\n",
2448 (unsigned long long)e->sector, e->size);
2449 return;
2450 }
2451
2452 reply = (struct drbd_nl_cfg_reply*)cn_reply->data;
2453 tl = reply->tag_list;
2454
2455 tl = tl_add_str(tl, T_dump_ee_reason, reason);
2456 tl = tl_add_blob(tl, T_seen_digest, seen_hash, dgs);
2457 tl = tl_add_blob(tl, T_calc_digest, calc_hash, dgs);
2458 tl = tl_add_int(tl, T_ee_sector, &e->sector);
2459 tl = tl_add_int(tl, T_ee_block_id, &e->block_id);
2460
2461 /* dump the first 32k */
2462 len = min_t(unsigned, e->size, 32 << 10);
2463 put_unaligned(T_ee_data, tl++);
2464 put_unaligned(len, tl++);
2465
2466 page = e->pages;
2467 page_chain_for_each(page) {
2468 void *d = kmap_atomic(page, KM_USER0);
2469 unsigned l = min_t(unsigned, len, PAGE_SIZE);
2470 memcpy(tl, d, l);
2471 kunmap_atomic(d, KM_USER0);
2472 tl = (unsigned short*)((char*)tl + l);
2473 len -= l;
2474 if (len == 0)
2475 break;
2476 }
2477 put_unaligned(TT_END, tl++); /* Close the tag list */
2478
2479 cn_reply->id.idx = CN_IDX_DRBD;
2480 cn_reply->id.val = CN_VAL_DRBD;
2481
2482 cn_reply->seq = atomic_add_return(1,&drbd_nl_seq);
2483 cn_reply->ack = 0; // not used here.
2484 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2485 (int)((char*)tl - (char*)reply->tag_list);
2486 cn_reply->flags = 0;
2487
2488 reply->packet_type = P_dump_ee;
2489 reply->minor = mdev_to_minor(mdev);
2490 reply->ret_code = NO_ERROR;
2491
2492 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2493 kfree(cn_reply);
2494 }
2495
2496 void drbd_bcast_sync_progress(struct drbd_conf *mdev)
2497 {
2498 char buffer[sizeof(struct cn_msg)+
2499 sizeof(struct drbd_nl_cfg_reply)+
2500 sizeof(struct sync_progress_tag_len_struct)+
2501 sizeof(short int)];
2502 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2503 struct drbd_nl_cfg_reply *reply =
2504 (struct drbd_nl_cfg_reply *)cn_reply->data;
2505 unsigned short *tl = reply->tag_list;
2506 unsigned long rs_left;
2507 unsigned int res;
2508
2509 /* no local ref, no bitmap, no syncer progress, no broadcast. */
2510 if (!get_ldev(mdev))
2511 return;
2512 drbd_get_syncer_progress(mdev, &rs_left, &res);
2513 put_ldev(mdev);
2514
2515 tl = tl_add_int(tl, T_sync_progress, &res);
2516 put_unaligned(TT_END, tl++); /* Close the tag list */
2517
2518 cn_reply->id.idx = CN_IDX_DRBD;
2519 cn_reply->id.val = CN_VAL_DRBD;
2520
2521 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2522 cn_reply->ack = 0; /* not used here. */
2523 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2524 (int)((char *)tl - (char *)reply->tag_list);
2525 cn_reply->flags = 0;
2526
2527 reply->packet_type = P_sync_progress;
2528 reply->minor = mdev_to_minor(mdev);
2529 reply->ret_code = NO_ERROR;
2530
2531 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2532 }
2533
2534 int __init drbd_nl_init(void)
2535 {
2536 static struct cb_id cn_id_drbd;
2537 int err, try=10;
2538
2539 cn_id_drbd.val = CN_VAL_DRBD;
2540 do {
2541 cn_id_drbd.idx = cn_idx;
2542 err = cn_add_callback(&cn_id_drbd, "cn_drbd", &drbd_connector_callback);
2543 if (!err)
2544 break;
2545 cn_idx = (cn_idx + CN_IDX_STEP);
2546 } while (try--);
2547
2548 if (err) {
2549 printk(KERN_ERR "drbd: cn_drbd failed to register\n");
2550 return err;
2551 }
2552
2553 return 0;
2554 }
2555
2556 void drbd_nl_cleanup(void)
2557 {
2558 static struct cb_id cn_id_drbd;
2559
2560 cn_id_drbd.idx = cn_idx;
2561 cn_id_drbd.val = CN_VAL_DRBD;
2562
2563 cn_del_callback(&cn_id_drbd);
2564 }
2565
2566 void drbd_nl_send_reply(struct cn_msg *req, int ret_code)
2567 {
2568 char buffer[sizeof(struct cn_msg)+sizeof(struct drbd_nl_cfg_reply)];
2569 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2570 struct drbd_nl_cfg_reply *reply =
2571 (struct drbd_nl_cfg_reply *)cn_reply->data;
2572 int rr;
2573
2574 memset(buffer, 0, sizeof(buffer));
2575 cn_reply->id = req->id;
2576
2577 cn_reply->seq = req->seq;
2578 cn_reply->ack = req->ack + 1;
2579 cn_reply->len = sizeof(struct drbd_nl_cfg_reply);
2580 cn_reply->flags = 0;
2581
2582 reply->packet_type = P_return_code_only;
2583 reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor;
2584 reply->ret_code = ret_code;
2585
2586 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2587 if (rr && rr != -ESRCH)
2588 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2589 }
2590
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree