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drbd: log UUIDs whenever they change
[deliverable/linux.git] / drivers / block / drbd / drbd_nl.c
CommitLineData
b411b363
PR		 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
b411b363
PR		 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"
265be2d0 36#include "drbd_req.h"
b411b363
PR		 37#include "drbd_wrappers.h"
38#include <asm/unaligned.h>
39#include <linux/drbd_tag_magic.h>
40#include <linux/drbd_limits.h>
87f7be4c
PR		 41#include <linux/compiler.h>
42#include <linux/kthread.h>
b411b363
PR		 43
44static unsigned short *tl_add_blob(unsigned short *, enum drbd_tags, const void *, int);
45static unsigned short *tl_add_str(unsigned short *, enum drbd_tags, const char *);
46static unsigned short *tl_add_int(unsigned short *, enum drbd_tags, const void *);
47
48/* see get_sb_bdev and bd_claim */
49static 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) \
53static int name ## _from_tags(struct drbd_conf *mdev, \
54 unsigned short *tags, struct name *arg) __attribute__ ((unused)); \
55static 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) \
101static unsigned short* \
102name ## _to_tags(struct drbd_conf *mdev, \
103 struct name *arg, unsigned short *tags) __attribute__ ((unused)); \
104static unsigned short* \
105name ## _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
134void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name);
135void drbd_nl_send_reply(struct cn_msg *, int);
136
137int 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
1090c056
LE		 175 /* The helper may take some time.
176 * write out any unsynced meta data changes now */
177 drbd_md_sync(mdev);
178
b411b363
PR		 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
198enum 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");
fb22c402
PR		 212 nps = mdev->state.pdsk;
213 goto out;
b411b363
PR		 214 }
215
b411b363
PR		 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);
fb22c402
PR		 260
261out:
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
b411b363
PR		 268 return nps;
269}
270
87f7be4c
PR		 271static 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
282void 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}
b411b363 290
bf885f8a
AG		 291enum drbd_state_rv
292drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
b411b363
PR		 293{
294 const int max_tries = 4;
bf885f8a 295 enum drbd_state_rv rv = SS_UNKNOWN_ERROR;
b411b363
PR		 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) {
bf885f8a 310 rv = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE);
b411b363
PR		 311
312 /* in case we first succeeded to outdate,
313 * but now suddenly could establish a connection */
bf885f8a 314 if (rv == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
b411b363
PR		 315 val.pdsk = 0;
316 mask.pdsk = 0;
317 continue;
318 }
319
bf885f8a 320 if (rv == SS_NO_UP_TO_DATE_DISK && force &&
d10a33c6
PR		 321 (mdev->state.disk < D_UP_TO_DATE &&
322 mdev->state.disk >= D_INCONSISTENT)) {
b411b363
PR		 323 mask.disk = D_MASK;
324 val.disk = D_UP_TO_DATE;
325 forced = 1;
326 continue;
327 }
328
bf885f8a 329 if (rv == SS_NO_UP_TO_DATE_DISK &&
b411b363
PR		 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
bf885f8a 345 if (rv == SS_NOTHING_TO_DO)
b411b363 346 goto fail;
bf885f8a 347 if (rv == SS_PRIMARY_NOP && mask.pdsk == 0) {
b411b363
PR		 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 }
bf885f8a 360 if (rv == SS_TWO_PRIMARIES) {
b411b363
PR		 361 /* Maybe the peer is detected as dead very soon...
362 retry at most once more in this case. */
20ee6390 363 schedule_timeout_interruptible((mdev->net_conf->ping_timeo+1)*HZ/10);
b411b363
PR		 364 if (try < max_tries)
365 try = max_tries - 1;
366 continue;
367 }
bf885f8a
AG		 368 if (rv < SS_SUCCESS) {
369 rv = _drbd_request_state(mdev, mask, val,
b411b363 370 CS_VERBOSE + CS_WAIT_COMPLETE);
bf885f8a 371 if (rv < SS_SUCCESS)
b411b363
PR		 372 goto fail;
373 }
374 break;
375 }
376
bf885f8a 377 if (rv < SS_SUCCESS)
b411b363
PR		 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) {
81e84650 387 set_disk_ro(mdev->vdisk, true);
b411b363
PR		 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 }
81e84650 397 set_disk_ro(mdev->vdisk, false);
b411b363
PR		 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
19f843aa
LE		 409 /* writeout of activity log covered areas of the bitmap
410 * to stable storage done in after state change already */
b411b363
PR		 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);
bf885f8a 424 return rv;
b411b363
PR		 425}
426
ef50a3e3
LE		 427static 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}
b411b363
PR		 460
461static 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 =
1f552430 473 drbd_set_role(mdev, R_PRIMARY, primary_args.primary_force);
b411b363
PR		 474
475 return 0;
476}
477
478static 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 */
488static 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
4b0715f0 529/* input size is expected to be in KB */
b411b363
PR		 530char *ppsize(char *buf, unsigned long long size)
531{
4b0715f0
LE		 532 /* Needs 9 bytes at max including trailing NUL:
533 * -1ULL ==> "16384 EB" */
b411b363
PR		 534 static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
535 int base = 0;
4b0715f0 536 while (size >= 10000 && base < sizeof(units)-1) {
b411b363
PR		 537 /* shift + round */
538 size = (size >> 10) + !!(size & (1<<9));
539 base++;
540 }
4b0715f0 541 sprintf(buf, "%u %cB", (unsigned)size, units[base]);
b411b363
PR		 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 */
559void drbd_suspend_io(struct drbd_conf *mdev)
560{
561 set_bit(SUSPEND_IO, &mdev->flags);
fb22c402 562 if (is_susp(mdev->state))
265be2d0 563 return;
b411b363
PR		 564 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
565}
566
567void 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 */
d845030f 580enum determine_dev_size drbd_determin_dev_size(struct drbd_conf *mdev, enum dds_flags flags) __must_hold(local)
b411b363
PR		 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
d845030f 611 size = drbd_new_dev_size(mdev, mdev->ldev, flags & DDSF_FORCED);
b411b363
PR		 612
613 if (drbd_get_capacity(mdev->this_bdev) != size ||
614 drbd_bm_capacity(mdev) != size) {
615 int err;
02d9a94b 616 err = drbd_bm_resize(mdev, size, !(flags & DDSF_NO_RESYNC));
b411b363
PR		 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) {
24dccabb
AG		 645 int err;
646
b411b363
PR		 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");
24dccabb
AG		 651 err = drbd_bitmap_io(mdev, &drbd_bm_write, "size changed"); /* does drbd_resume_io() ! */
652 if (err) {
653 rv = dev_size_error;
654 goto out;
655 }
b411b363
PR		 656 drbd_md_mark_dirty(mdev);
657 }
658
659 if (size > la_size)
660 rv = grew;
661 if (size < la_size)
662 rv = shrunk;
663out:
664 lc_unlock(mdev->act_log);
665 wake_up(&mdev->al_wait);
666 drbd_resume_io(mdev);
667
668 return rv;
669}
670
671sector_t
a393db6f 672drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev, int assume_peer_has_space)
b411b363
PR		 673{
674 sector_t p_size = mdev->p_size; /* partner's disk size. */
675 sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */
676 sector_t m_size; /* my size */
677 sector_t u_size = bdev->dc.disk_size; /* size requested by user. */
678 sector_t size = 0;
679
680 m_size = drbd_get_max_capacity(bdev);
681
a393db6f
PR		 682 if (mdev->state.conn < C_CONNECTED && assume_peer_has_space) {
683 dev_warn(DEV, "Resize while not connected was forced by the user!\n");
684 p_size = m_size;
685 }
686
b411b363
PR		 687 if (p_size && m_size) {
688 size = min_t(sector_t, p_size, m_size);
689 } else {
690 if (la_size) {
691 size = la_size;
692 if (m_size && m_size < size)
693 size = m_size;
694 if (p_size && p_size < size)
695 size = p_size;
696 } else {
697 if (m_size)
698 size = m_size;
699 if (p_size)
700 size = p_size;
701 }
702 }
703
704 if (size == 0)
705 dev_err(DEV, "Both nodes diskless!\n");
706
707 if (u_size) {
708 if (u_size > size)
709 dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n",
710 (unsigned long)u_size>>1, (unsigned long)size>>1);
711 else
712 size = u_size;
713 }
714
715 return size;
716}
717
718/**
719 * drbd_check_al_size() - Ensures that the AL is of the right size
720 * @mdev: DRBD device.
721 *
722 * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
723 * failed, and 0 on success. You should call drbd_md_sync() after you called
724 * this function.
725 */
726static int drbd_check_al_size(struct drbd_conf *mdev)
727{
728 struct lru_cache *n, *t;
729 struct lc_element *e;
730 unsigned int in_use;
731 int i;
732
733 ERR_IF(mdev->sync_conf.al_extents < 7)
734 mdev->sync_conf.al_extents = 127;
735
736 if (mdev->act_log &&
737 mdev->act_log->nr_elements == mdev->sync_conf.al_extents)
738 return 0;
739
740 in_use = 0;
741 t = mdev->act_log;
742 n = lc_create("act_log", drbd_al_ext_cache,
743 mdev->sync_conf.al_extents, sizeof(struct lc_element), 0);
744
745 if (n == NULL) {
746 dev_err(DEV, "Cannot allocate act_log lru!\n");
747 return -ENOMEM;
748 }
749 spin_lock_irq(&mdev->al_lock);
750 if (t) {
751 for (i = 0; i < t->nr_elements; i++) {
752 e = lc_element_by_index(t, i);
753 if (e->refcnt)
754 dev_err(DEV, "refcnt(%d)==%d\n",
755 e->lc_number, e->refcnt);
756 in_use += e->refcnt;
757 }
758 }
759 if (!in_use)
760 mdev->act_log = n;
761 spin_unlock_irq(&mdev->al_lock);
762 if (in_use) {
763 dev_err(DEV, "Activity log still in use!\n");
764 lc_destroy(n);
765 return -EBUSY;
766 } else {
767 if (t)
768 lc_destroy(t);
769 }
770 drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */
771 return 0;
772}
773
1816a2b4 774void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_bio_size) __must_hold(local)
b411b363
PR		 775{
776 struct request_queue * const q = mdev->rq_queue;
777 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
778 int max_segments = mdev->ldev->dc.max_bio_bvecs;
1816a2b4 779 int max_hw_sectors = min(queue_max_hw_sectors(b), max_bio_size >> 9);
b411b363 780
b411b363 781 blk_queue_logical_block_size(q, 512);
1816a2b4
LE		 782 blk_queue_max_hw_sectors(q, max_hw_sectors);
783 /* This is the workaround for "bio would need to, but cannot, be split" */
784 blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
785 blk_queue_segment_boundary(q, PAGE_CACHE_SIZE-1);
786 blk_queue_stack_limits(q, b);
b411b363 787
1816a2b4 788 dev_info(DEV, "max BIO size = %u\n", queue_max_hw_sectors(q) << 9);
b411b363
PR		 789
790 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
791 dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
792 q->backing_dev_info.ra_pages,
793 b->backing_dev_info.ra_pages);
794 q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
795 }
796}
797
798/* serialize deconfig (worker exiting, doing cleanup)
799 * and reconfig (drbdsetup disk, drbdsetup net)
800 *
c518d04f
LE		 801 * Wait for a potentially exiting worker, then restart it,
802 * or start a new one. Flush any pending work, there may still be an
803 * after_state_change queued.
b411b363
PR		 804 */
805static void drbd_reconfig_start(struct drbd_conf *mdev)
806{
6c6c7951 807 wait_event(mdev->state_wait, !test_and_set_bit(CONFIG_PENDING, &mdev->flags));
b411b363
PR		 808 wait_event(mdev->state_wait, !test_bit(DEVICE_DYING, &mdev->flags));
809 drbd_thread_start(&mdev->worker);
c518d04f 810 drbd_flush_workqueue(mdev);
b411b363
PR		 811}
812
813/* if still unconfigured, stops worker again.
814 * if configured now, clears CONFIG_PENDING.
815 * wakes potential waiters */
816static void drbd_reconfig_done(struct drbd_conf *mdev)
817{
818 spin_lock_irq(&mdev->req_lock);
819 if (mdev->state.disk == D_DISKLESS &&
820 mdev->state.conn == C_STANDALONE &&
821 mdev->state.role == R_SECONDARY) {
822 set_bit(DEVICE_DYING, &mdev->flags);
823 drbd_thread_stop_nowait(&mdev->worker);
824 } else
825 clear_bit(CONFIG_PENDING, &mdev->flags);
826 spin_unlock_irq(&mdev->req_lock);
827 wake_up(&mdev->state_wait);
828}
829
0778286a
PR		 830/* Make sure IO is suspended before calling this function(). */
831static void drbd_suspend_al(struct drbd_conf *mdev)
832{
833 int s = 0;
834
835 if (lc_try_lock(mdev->act_log)) {
836 drbd_al_shrink(mdev);
837 lc_unlock(mdev->act_log);
838 } else {
839 dev_warn(DEV, "Failed to lock al in drbd_suspend_al()\n");
840 return;
841 }
842
843 spin_lock_irq(&mdev->req_lock);
844 if (mdev->state.conn < C_CONNECTED)
845 s = !test_and_set_bit(AL_SUSPENDED, &mdev->flags);
846
847 spin_unlock_irq(&mdev->req_lock);
848
849 if (s)
850 dev_info(DEV, "Suspended AL updates\n");
851}
852
b411b363
PR		 853/* does always return 0;
854 * interesting return code is in reply->ret_code */
855static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
856 struct drbd_nl_cfg_reply *reply)
857{
116676ca 858 enum drbd_ret_code retcode;
b411b363
PR		 859 enum determine_dev_size dd;
860 sector_t max_possible_sectors;
861 sector_t min_md_device_sectors;
862 struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
e525fd89 863 struct block_device *bdev;
b411b363
PR		 864 struct lru_cache *resync_lru = NULL;
865 union drbd_state ns, os;
1816a2b4 866 unsigned int max_bio_size;
f2024e7c 867 enum drbd_state_rv rv;
b411b363
PR		 868 int cp_discovered = 0;
869 int logical_block_size;
870
871 drbd_reconfig_start(mdev);
872
873 /* if you want to reconfigure, please tear down first */
874 if (mdev->state.disk > D_DISKLESS) {
875 retcode = ERR_DISK_CONFIGURED;
876 goto fail;
877 }
82f59cc6
LE		 878 /* It may just now have detached because of IO error. Make sure
879 * drbd_ldev_destroy is done already, we may end up here very fast,
880 * e.g. if someone calls attach from the on-io-error handler,
881 * to realize a "hot spare" feature (not that I'd recommend that) */
882 wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt));
b411b363
PR		 883
884 /* allocation not in the IO path, cqueue thread context */
885 nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
886 if (!nbc) {
887 retcode = ERR_NOMEM;
888 goto fail;
889 }
890
891 nbc->dc.disk_size = DRBD_DISK_SIZE_SECT_DEF;
892 nbc->dc.on_io_error = DRBD_ON_IO_ERROR_DEF;
893 nbc->dc.fencing = DRBD_FENCING_DEF;
894 nbc->dc.max_bio_bvecs = DRBD_MAX_BIO_BVECS_DEF;
895
896 if (!disk_conf_from_tags(mdev, nlp->tag_list, &nbc->dc)) {
897 retcode = ERR_MANDATORY_TAG;
898 goto fail;
899 }
900
901 if (nbc->dc.meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
902 retcode = ERR_MD_IDX_INVALID;
903 goto fail;
904 }
905
47ff2d0a
PR		 906 if (get_net_conf(mdev)) {
907 int prot = mdev->net_conf->wire_protocol;
908 put_net_conf(mdev);
909 if (nbc->dc.fencing == FP_STONITH && prot == DRBD_PROT_A) {
910 retcode = ERR_STONITH_AND_PROT_A;
911 goto fail;
912 }
913 }
914
d4d77629
TH		 915 bdev = blkdev_get_by_path(nbc->dc.backing_dev,
916 FMODE_READ | FMODE_WRITE | FMODE_EXCL, mdev);
e525fd89 917 if (IS_ERR(bdev)) {
b411b363 918 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev,
e525fd89 919 PTR_ERR(bdev));
b411b363
PR		 920 retcode = ERR_OPEN_DISK;
921 goto fail;
922 }
e525fd89
TH		 923 nbc->backing_bdev = bdev;
924
925 /*
926 * meta_dev_idx >= 0: external fixed size, possibly multiple
927 * drbd sharing one meta device. TODO in that case, paranoia
928 * check that [md_bdev, meta_dev_idx] is not yet used by some
929 * other drbd minor! (if you use drbd.conf + drbdadm, that
930 * should check it for you already; but if you don't, or
931 * someone fooled it, we need to double check here)
932 */
d4d77629
TH		 933 bdev = blkdev_get_by_path(nbc->dc.meta_dev,
934 FMODE_READ | FMODE_WRITE | FMODE_EXCL,
935 (nbc->dc.meta_dev_idx < 0) ?
936 (void *)mdev : (void *)drbd_m_holder);
e525fd89 937 if (IS_ERR(bdev)) {
b411b363 938 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev,
e525fd89 939 PTR_ERR(bdev));
b411b363
PR		 940 retcode = ERR_OPEN_MD_DISK;
941 goto fail;
942 }
e525fd89 943 nbc->md_bdev = bdev;
b411b363 944
e525fd89
TH		 945 if ((nbc->backing_bdev == nbc->md_bdev) !=
946 (nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
947 nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
948 retcode = ERR_MD_IDX_INVALID;
b411b363
PR		 949 goto fail;
950 }
951
952 resync_lru = lc_create("resync", drbd_bm_ext_cache,
953 61, sizeof(struct bm_extent),
954 offsetof(struct bm_extent, lce));
955 if (!resync_lru) {
956 retcode = ERR_NOMEM;
e525fd89 957 goto fail;
b411b363
PR		 958 }
959
960 /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
961 drbd_md_set_sector_offsets(mdev, nbc);
962
963 if (drbd_get_max_capacity(nbc) < nbc->dc.disk_size) {
964 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
965 (unsigned long long) drbd_get_max_capacity(nbc),
966 (unsigned long long) nbc->dc.disk_size);
967 retcode = ERR_DISK_TO_SMALL;
e525fd89 968 goto fail;
b411b363
PR		 969 }
970
971 if (nbc->dc.meta_dev_idx < 0) {
972 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
973 /* at least one MB, otherwise it does not make sense */
974 min_md_device_sectors = (2<<10);
975 } else {
976 max_possible_sectors = DRBD_MAX_SECTORS;
977 min_md_device_sectors = MD_RESERVED_SECT * (nbc->dc.meta_dev_idx + 1);
978 }
979
b411b363
PR		 980 if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
981 retcode = ERR_MD_DISK_TO_SMALL;
982 dev_warn(DEV, "refusing attach: md-device too small, "
983 "at least %llu sectors needed for this meta-disk type\n",
984 (unsigned long long) min_md_device_sectors);
e525fd89 985 goto fail;
b411b363
PR		 986 }
987
988 /* Make sure the new disk is big enough
989 * (we may currently be R_PRIMARY with no local disk...) */
990 if (drbd_get_max_capacity(nbc) <
991 drbd_get_capacity(mdev->this_bdev)) {
992 retcode = ERR_DISK_TO_SMALL;
e525fd89 993 goto fail;
b411b363
PR		 994 }
995
996 nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
997
1352994b
LE		 998 if (nbc->known_size > max_possible_sectors) {
999 dev_warn(DEV, "==> truncating very big lower level device "
1000 "to currently maximum possible %llu sectors <==\n",
1001 (unsigned long long) max_possible_sectors);
1002 if (nbc->dc.meta_dev_idx >= 0)
1003 dev_warn(DEV, "==>> using internal or flexible "
1004 "meta data may help <<==\n");
1005 }
1006
b411b363
PR		 1007 drbd_suspend_io(mdev);
1008 /* also wait for the last barrier ack. */
fb22c402 1009 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt) || is_susp(mdev->state));
b411b363
PR		 1010 /* and for any other previously queued work */
1011 drbd_flush_workqueue(mdev);
1012
f2024e7c
AG		 1013 rv = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
1014 retcode = rv; /* FIXME: Type mismatch. */
b411b363 1015 drbd_resume_io(mdev);
f2024e7c 1016 if (rv < SS_SUCCESS)
e525fd89 1017 goto fail;
b411b363
PR		 1018
1019 if (!get_ldev_if_state(mdev, D_ATTACHING))
1020 goto force_diskless;
1021
1022 drbd_md_set_sector_offsets(mdev, nbc);
1023
4aa83b7b
LE		 1024 /* allocate a second IO page if logical_block_size != 512 */
1025 logical_block_size = bdev_logical_block_size(nbc->md_bdev);
1026 if (logical_block_size == 0)
1027 logical_block_size = MD_SECTOR_SIZE;
1028
1029 if (logical_block_size != MD_SECTOR_SIZE) {
1030 if (!mdev->md_io_tmpp) {
1031 struct page *page = alloc_page(GFP_NOIO);
1032 if (!page)
1033 goto force_diskless_dec;
1034
1035 dev_warn(DEV, "Meta data's bdev logical_block_size = %d != %d\n",
1036 logical_block_size, MD_SECTOR_SIZE);
1037 dev_warn(DEV, "Workaround engaged (has performance impact).\n");
1038
1039 mdev->md_io_tmpp = page;
1040 }
1041 }
1042
b411b363
PR		 1043 if (!mdev->bitmap) {
1044 if (drbd_bm_init(mdev)) {
1045 retcode = ERR_NOMEM;
1046 goto force_diskless_dec;
1047 }
1048 }
1049
1050 retcode = drbd_md_read(mdev, nbc);
1051 if (retcode != NO_ERROR)
1052 goto force_diskless_dec;
1053
1054 if (mdev->state.conn < C_CONNECTED &&
1055 mdev->state.role == R_PRIMARY &&
1056 (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
1057 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
1058 (unsigned long long)mdev->ed_uuid);
1059 retcode = ERR_DATA_NOT_CURRENT;
1060 goto force_diskless_dec;
1061 }
1062
1063 /* Since we are diskless, fix the activity log first... */
1064 if (drbd_check_al_size(mdev)) {
1065 retcode = ERR_NOMEM;
1066 goto force_diskless_dec;
1067 }
1068
1069 /* Prevent shrinking of consistent devices ! */
1070 if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
a393db6f 1071 drbd_new_dev_size(mdev, nbc, 0) < nbc->md.la_size_sect) {
b411b363
PR		 1072 dev_warn(DEV, "refusing to truncate a consistent device\n");
1073 retcode = ERR_DISK_TO_SMALL;
1074 goto force_diskless_dec;
1075 }
1076
1077 if (!drbd_al_read_log(mdev, nbc)) {
1078 retcode = ERR_IO_MD_DISK;
1079 goto force_diskless_dec;
1080 }
1081
b411b363
PR		 1082 /* Reset the "barriers don't work" bits here, then force meta data to
1083 * be written, to ensure we determine if barriers are supported. */
1084 if (nbc->dc.no_md_flush)
a8a4e51e 1085 set_bit(MD_NO_FUA, &mdev->flags);
b411b363 1086 else
a8a4e51e 1087 clear_bit(MD_NO_FUA, &mdev->flags);
b411b363
PR		 1088
1089 /* Point of no return reached.
1090 * Devices and memory are no longer released by error cleanup below.
1091 * now mdev takes over responsibility, and the state engine should
1092 * clean it up somewhere. */
1093 D_ASSERT(mdev->ldev == NULL);
1094 mdev->ldev = nbc;
1095 mdev->resync = resync_lru;
1096 nbc = NULL;
1097 resync_lru = NULL;
1098
2451fc3b
PR		 1099 mdev->write_ordering = WO_bdev_flush;
1100 drbd_bump_write_ordering(mdev, WO_bdev_flush);
b411b363
PR		 1101
1102 if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
1103 set_bit(CRASHED_PRIMARY, &mdev->flags);
1104 else
1105 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1106
894c6a94 1107 if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
fb22c402 1108 !(mdev->state.role == R_PRIMARY && mdev->state.susp_nod)) {
b411b363
PR		 1109 set_bit(CRASHED_PRIMARY, &mdev->flags);
1110 cp_discovered = 1;
1111 }
1112
1113 mdev->send_cnt = 0;
1114 mdev->recv_cnt = 0;
1115 mdev->read_cnt = 0;
1116 mdev->writ_cnt = 0;
1117
1816a2b4 1118 max_bio_size = DRBD_MAX_BIO_SIZE;
8979d9c9
LE		 1119 if (mdev->state.conn == C_CONNECTED) {
1120 /* We are Primary, Connected, and now attach a new local
1121 * backing store. We must not increase the user visible maximum
1122 * bio size on this device to something the peer may not be
1123 * able to handle. */
1124 if (mdev->agreed_pro_version < 94)
1816a2b4 1125 max_bio_size = queue_max_hw_sectors(mdev->rq_queue) << 9;
8979d9c9 1126 else if (mdev->agreed_pro_version == 94)
1816a2b4 1127 max_bio_size = DRBD_MAX_SIZE_H80_PACKET;
8979d9c9
LE		 1128 /* else: drbd 8.3.9 and later, stay with default */
1129 }
1130
1816a2b4 1131 drbd_setup_queue_param(mdev, max_bio_size);
b411b363
PR		 1132
1133 /* If I am currently not R_PRIMARY,
1134 * but meta data primary indicator is set,
1135 * I just now recover from a hard crash,
1136 * and have been R_PRIMARY before that crash.
1137 *
1138 * Now, if I had no connection before that crash
1139 * (have been degraded R_PRIMARY), chances are that
1140 * I won't find my peer now either.
1141 *
1142 * In that case, and _only_ in that case,
1143 * we use the degr-wfc-timeout instead of the default,
1144 * so we can automatically recover from a crash of a
1145 * degraded but active "cluster" after a certain timeout.
1146 */
1147 clear_bit(USE_DEGR_WFC_T, &mdev->flags);
1148 if (mdev->state.role != R_PRIMARY &&
1149 drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1150 !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
1151 set_bit(USE_DEGR_WFC_T, &mdev->flags);
1152
a393db6f 1153 dd = drbd_determin_dev_size(mdev, 0);
b411b363
PR		 1154 if (dd == dev_size_error) {
1155 retcode = ERR_NOMEM_BITMAP;
1156 goto force_diskless_dec;
1157 } else if (dd == grew)
1158 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
1159
1160 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
1161 dev_info(DEV, "Assuming that all blocks are out of sync "
1162 "(aka FullSync)\n");
1163 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from attaching")) {
1164 retcode = ERR_IO_MD_DISK;
1165 goto force_diskless_dec;
1166 }
1167 } else {
1168 if (drbd_bitmap_io(mdev, &drbd_bm_read, "read from attaching") < 0) {
1169 retcode = ERR_IO_MD_DISK;
1170 goto force_diskless_dec;
1171 }
1172 }
1173
1174 if (cp_discovered) {
1175 drbd_al_apply_to_bm(mdev);
19f843aa
LE		 1176 if (drbd_bitmap_io(mdev, &drbd_bm_write, "crashed primary apply AL")) {
1177 retcode = ERR_IO_MD_DISK;
1178 goto force_diskless_dec;
1179 }
b411b363
PR		 1180 }
1181
0778286a
PR		 1182 if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev))
1183 drbd_suspend_al(mdev); /* IO is still suspended here... */
1184
b411b363
PR		 1185 spin_lock_irq(&mdev->req_lock);
1186 os = mdev->state;
1187 ns.i = os.i;
1188 /* If MDF_CONSISTENT is not set go into inconsistent state,
1189 otherwise investigate MDF_WasUpToDate...
1190 If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1191 otherwise into D_CONSISTENT state.
1192 */
1193 if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
1194 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
1195 ns.disk = D_CONSISTENT;
1196 else
1197 ns.disk = D_OUTDATED;
1198 } else {
1199 ns.disk = D_INCONSISTENT;
1200 }
1201
1202 if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
1203 ns.pdsk = D_OUTDATED;
1204
1205 if ( ns.disk == D_CONSISTENT &&
1206 (ns.pdsk == D_OUTDATED || mdev->ldev->dc.fencing == FP_DONT_CARE))
1207 ns.disk = D_UP_TO_DATE;
1208
1209 /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1210 MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1211 this point, because drbd_request_state() modifies these
1212 flags. */
1213
1214 /* In case we are C_CONNECTED postpone any decision on the new disk
1215 state after the negotiation phase. */
1216 if (mdev->state.conn == C_CONNECTED) {
1217 mdev->new_state_tmp.i = ns.i;
1218 ns.i = os.i;
1219 ns.disk = D_NEGOTIATING;
dc66c74d
PR		 1220
1221 /* We expect to receive up-to-date UUIDs soon.
1222 To avoid a race in receive_state, free p_uuid while
1223 holding req_lock. I.e. atomic with the state change */
1224 kfree(mdev->p_uuid);
1225 mdev->p_uuid = NULL;
b411b363
PR		 1226 }
1227
1228 rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
1229 ns = mdev->state;
1230 spin_unlock_irq(&mdev->req_lock);
1231
1232 if (rv < SS_SUCCESS)
1233 goto force_diskless_dec;
1234
1235 if (mdev->state.role == R_PRIMARY)
1236 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
1237 else
1238 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1239
1240 drbd_md_mark_dirty(mdev);
1241 drbd_md_sync(mdev);
1242
1243 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1244 put_ldev(mdev);
1245 reply->ret_code = retcode;
1246 drbd_reconfig_done(mdev);
1247 return 0;
1248
1249 force_diskless_dec:
1250 put_ldev(mdev);
1251 force_diskless:
82f59cc6 1252 drbd_force_state(mdev, NS(disk, D_FAILED));
b411b363 1253 drbd_md_sync(mdev);
b411b363
PR		 1254 fail:
1255 if (nbc) {
e525fd89
TH		 1256 if (nbc->backing_bdev)
1257 blkdev_put(nbc->backing_bdev,
1258 FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1259 if (nbc->md_bdev)
1260 blkdev_put(nbc->md_bdev,
1261 FMODE_READ | FMODE_WRITE | FMODE_EXCL);
b411b363
PR		 1262 kfree(nbc);
1263 }
1264 lc_destroy(resync_lru);
1265
1266 reply->ret_code = retcode;
1267 drbd_reconfig_done(mdev);
1268 return 0;
1269}
1270
82f59cc6
LE		 1271/* Detaching the disk is a process in multiple stages. First we need to lock
1272 * out application IO, in-flight IO, IO stuck in drbd_al_begin_io.
1273 * Then we transition to D_DISKLESS, and wait for put_ldev() to return all
1274 * internal references as well.
1275 * Only then we have finally detached. */
b411b363
PR		 1276static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1277 struct drbd_nl_cfg_reply *reply)
1278{
82f59cc6 1279 drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */
b411b363 1280 reply->ret_code = drbd_request_state(mdev, NS(disk, D_DISKLESS));
82f59cc6
LE		 1281 if (mdev->state.disk == D_DISKLESS)
1282 wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt));
1283 drbd_resume_io(mdev);
b411b363
PR		 1284 return 0;
1285}
1286
1287static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1288 struct drbd_nl_cfg_reply *reply)
1289{
1290 int i, ns;
116676ca 1291 enum drbd_ret_code retcode;
b411b363
PR		 1292 struct net_conf *new_conf = NULL;
1293 struct crypto_hash *tfm = NULL;
1294 struct crypto_hash *integrity_w_tfm = NULL;
1295 struct crypto_hash *integrity_r_tfm = NULL;
1296 struct hlist_head *new_tl_hash = NULL;
1297 struct hlist_head *new_ee_hash = NULL;
1298 struct drbd_conf *odev;
1299 char hmac_name[CRYPTO_MAX_ALG_NAME];
1300 void *int_dig_out = NULL;
1301 void *int_dig_in = NULL;
1302 void *int_dig_vv = NULL;
1303 struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr;
1304
1305 drbd_reconfig_start(mdev);
1306
1307 if (mdev->state.conn > C_STANDALONE) {
1308 retcode = ERR_NET_CONFIGURED;
1309 goto fail;
1310 }
1311
1312 /* allocation not in the IO path, cqueue thread context */
2db4e42e 1313 new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
b411b363
PR		 1314 if (!new_conf) {
1315 retcode = ERR_NOMEM;
1316 goto fail;
1317 }
1318
b411b363
PR		 1319 new_conf->timeout = DRBD_TIMEOUT_DEF;
1320 new_conf->try_connect_int = DRBD_CONNECT_INT_DEF;
1321 new_conf->ping_int = DRBD_PING_INT_DEF;
1322 new_conf->max_epoch_size = DRBD_MAX_EPOCH_SIZE_DEF;
1323 new_conf->max_buffers = DRBD_MAX_BUFFERS_DEF;
1324 new_conf->unplug_watermark = DRBD_UNPLUG_WATERMARK_DEF;
1325 new_conf->sndbuf_size = DRBD_SNDBUF_SIZE_DEF;
1326 new_conf->rcvbuf_size = DRBD_RCVBUF_SIZE_DEF;
1327 new_conf->ko_count = DRBD_KO_COUNT_DEF;
1328 new_conf->after_sb_0p = DRBD_AFTER_SB_0P_DEF;
1329 new_conf->after_sb_1p = DRBD_AFTER_SB_1P_DEF;
1330 new_conf->after_sb_2p = DRBD_AFTER_SB_2P_DEF;
1331 new_conf->want_lose = 0;
1332 new_conf->two_primaries = 0;
1333 new_conf->wire_protocol = DRBD_PROT_C;
1334 new_conf->ping_timeo = DRBD_PING_TIMEO_DEF;
1335 new_conf->rr_conflict = DRBD_RR_CONFLICT_DEF;
422028b1
PR		 1336 new_conf->on_congestion = DRBD_ON_CONGESTION_DEF;
1337 new_conf->cong_extents = DRBD_CONG_EXTENTS_DEF;
b411b363
PR		 1338
1339 if (!net_conf_from_tags(mdev, nlp->tag_list, new_conf)) {
1340 retcode = ERR_MANDATORY_TAG;
1341 goto fail;
1342 }
1343
1344 if (new_conf->two_primaries
1345 && (new_conf->wire_protocol != DRBD_PROT_C)) {
1346 retcode = ERR_NOT_PROTO_C;
1347 goto fail;
47ff2d0a
PR		 1348 }
1349
1350 if (get_ldev(mdev)) {
1351 enum drbd_fencing_p fp = mdev->ldev->dc.fencing;
1352 put_ldev(mdev);
1353 if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH) {
1354 retcode = ERR_STONITH_AND_PROT_A;
1355 goto fail;
1356 }
1357 }
b411b363 1358
422028b1
PR		 1359 if (new_conf->on_congestion != OC_BLOCK && new_conf->wire_protocol != DRBD_PROT_A) {
1360 retcode = ERR_CONG_NOT_PROTO_A;
1361 goto fail;
1362 }
1363
b411b363
PR		 1364 if (mdev->state.role == R_PRIMARY && new_conf->want_lose) {
1365 retcode = ERR_DISCARD;
1366 goto fail;
1367 }
1368
1369 retcode = NO_ERROR;
1370
1371 new_my_addr = (struct sockaddr *)&new_conf->my_addr;
1372 new_peer_addr = (struct sockaddr *)&new_conf->peer_addr;
1373 for (i = 0; i < minor_count; i++) {
1374 odev = minor_to_mdev(i);
1375 if (!odev || odev == mdev)
1376 continue;
1377 if (get_net_conf(odev)) {
1378 taken_addr = (struct sockaddr *)&odev->net_conf->my_addr;
1379 if (new_conf->my_addr_len == odev->net_conf->my_addr_len &&
1380 !memcmp(new_my_addr, taken_addr, new_conf->my_addr_len))
1381 retcode = ERR_LOCAL_ADDR;
1382
1383 taken_addr = (struct sockaddr *)&odev->net_conf->peer_addr;
1384 if (new_conf->peer_addr_len == odev->net_conf->peer_addr_len &&
1385 !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len))
1386 retcode = ERR_PEER_ADDR;
1387
1388 put_net_conf(odev);
1389 if (retcode != NO_ERROR)
1390 goto fail;
1391 }
1392 }
1393
1394 if (new_conf->cram_hmac_alg[0] != 0) {
1395 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
1396 new_conf->cram_hmac_alg);
1397 tfm = crypto_alloc_hash(hmac_name, 0, CRYPTO_ALG_ASYNC);
1398 if (IS_ERR(tfm)) {
1399 tfm = NULL;
1400 retcode = ERR_AUTH_ALG;
1401 goto fail;
1402 }
1403
0798219f 1404 if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) {
b411b363
PR		 1405 retcode = ERR_AUTH_ALG_ND;
1406 goto fail;
1407 }
1408 }
1409
1410 if (new_conf->integrity_alg[0]) {
1411 integrity_w_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1412 if (IS_ERR(integrity_w_tfm)) {
1413 integrity_w_tfm = NULL;
1414 retcode=ERR_INTEGRITY_ALG;
1415 goto fail;
1416 }
1417
1418 if (!drbd_crypto_is_hash(crypto_hash_tfm(integrity_w_tfm))) {
1419 retcode=ERR_INTEGRITY_ALG_ND;
1420 goto fail;
1421 }
1422
1423 integrity_r_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1424 if (IS_ERR(integrity_r_tfm)) {
1425 integrity_r_tfm = NULL;
1426 retcode=ERR_INTEGRITY_ALG;
1427 goto fail;
1428 }
1429 }
1430
1431 ns = new_conf->max_epoch_size/8;
1432 if (mdev->tl_hash_s != ns) {
1433 new_tl_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
1434 if (!new_tl_hash) {
1435 retcode = ERR_NOMEM;
1436 goto fail;
1437 }
1438 }
1439
1440 ns = new_conf->max_buffers/8;
1441 if (new_conf->two_primaries && (mdev->ee_hash_s != ns)) {
1442 new_ee_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
1443 if (!new_ee_hash) {
1444 retcode = ERR_NOMEM;
1445 goto fail;
1446 }
1447 }
1448
1449 ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
1450
1451 if (integrity_w_tfm) {
1452 i = crypto_hash_digestsize(integrity_w_tfm);
1453 int_dig_out = kmalloc(i, GFP_KERNEL);
1454 if (!int_dig_out) {
1455 retcode = ERR_NOMEM;
1456 goto fail;
1457 }
1458 int_dig_in = kmalloc(i, GFP_KERNEL);
1459 if (!int_dig_in) {
1460 retcode = ERR_NOMEM;
1461 goto fail;
1462 }
1463 int_dig_vv = kmalloc(i, GFP_KERNEL);
1464 if (!int_dig_vv) {
1465 retcode = ERR_NOMEM;
1466 goto fail;
1467 }
1468 }
1469
1470 if (!mdev->bitmap) {
1471 if(drbd_bm_init(mdev)) {
1472 retcode = ERR_NOMEM;
1473 goto fail;
1474 }
1475 }
1476
f70b3511 1477 drbd_flush_workqueue(mdev);
b411b363
PR		 1478 spin_lock_irq(&mdev->req_lock);
1479 if (mdev->net_conf != NULL) {
1480 retcode = ERR_NET_CONFIGURED;
1481 spin_unlock_irq(&mdev->req_lock);
1482 goto fail;
1483 }
1484 mdev->net_conf = new_conf;
1485
1486 mdev->send_cnt = 0;
1487 mdev->recv_cnt = 0;
1488
1489 if (new_tl_hash) {
1490 kfree(mdev->tl_hash);
1491 mdev->tl_hash_s = mdev->net_conf->max_epoch_size/8;
1492 mdev->tl_hash = new_tl_hash;
1493 }
1494
1495 if (new_ee_hash) {
1496 kfree(mdev->ee_hash);
1497 mdev->ee_hash_s = mdev->net_conf->max_buffers/8;
1498 mdev->ee_hash = new_ee_hash;
1499 }
1500
1501 crypto_free_hash(mdev->cram_hmac_tfm);
1502 mdev->cram_hmac_tfm = tfm;
1503
1504 crypto_free_hash(mdev->integrity_w_tfm);
1505 mdev->integrity_w_tfm = integrity_w_tfm;
1506
1507 crypto_free_hash(mdev->integrity_r_tfm);
1508 mdev->integrity_r_tfm = integrity_r_tfm;
1509
1510 kfree(mdev->int_dig_out);
1511 kfree(mdev->int_dig_in);
1512 kfree(mdev->int_dig_vv);
1513 mdev->int_dig_out=int_dig_out;
1514 mdev->int_dig_in=int_dig_in;
1515 mdev->int_dig_vv=int_dig_vv;
f70b3511 1516 retcode = _drbd_set_state(_NS(mdev, conn, C_UNCONNECTED), CS_VERBOSE, NULL);
b411b363
PR		 1517 spin_unlock_irq(&mdev->req_lock);
1518
b411b363
PR		 1519 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1520 reply->ret_code = retcode;
1521 drbd_reconfig_done(mdev);
1522 return 0;
1523
1524fail:
1525 kfree(int_dig_out);
1526 kfree(int_dig_in);
1527 kfree(int_dig_vv);
1528 crypto_free_hash(tfm);
1529 crypto_free_hash(integrity_w_tfm);
1530 crypto_free_hash(integrity_r_tfm);
1531 kfree(new_tl_hash);
1532 kfree(new_ee_hash);
1533 kfree(new_conf);
1534
1535 reply->ret_code = retcode;
1536 drbd_reconfig_done(mdev);
1537 return 0;
1538}
1539
1540static int drbd_nl_disconnect(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1541 struct drbd_nl_cfg_reply *reply)
1542{
1543 int retcode;
2561b9c1
PR		 1544 struct disconnect dc;
1545
1546 memset(&dc, 0, sizeof(struct disconnect));
1547 if (!disconnect_from_tags(mdev, nlp->tag_list, &dc)) {
1548 retcode = ERR_MANDATORY_TAG;
1549 goto fail;
1550 }
1551
1552 if (dc.force) {
1553 spin_lock_irq(&mdev->req_lock);
1554 if (mdev->state.conn >= C_WF_CONNECTION)
1555 _drbd_set_state(_NS(mdev, conn, C_DISCONNECTING), CS_HARD, NULL);
1556 spin_unlock_irq(&mdev->req_lock);
1557 goto done;
1558 }
b411b363
PR		 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
1600void 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
1616static 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;
b411b363 1621 enum determine_dev_size dd;
6495d2c6 1622 enum dds_flags ddsf;
b411b363
PR		 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
6495d2c6
PR		 1646 if (rs.no_resync && mdev->agreed_pro_version < 93) {
1647 retcode = ERR_NEED_APV_93;
1648 goto fail;
1649 }
1650
087c2492 1651 if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev))
b411b363 1652 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
b411b363
PR		 1653
1654 mdev->ldev->dc.disk_size = (sector_t)rs.resize_size;
6495d2c6
PR		 1655 ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
1656 dd = drbd_determin_dev_size(mdev, ddsf);
b411b363
PR		 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
087c2492 1664 if (mdev->state.conn == C_CONNECTED) {
b411b363
PR		 1665 if (dd == grew)
1666 set_bit(RESIZE_PENDING, &mdev->flags);
1667
1668 drbd_send_uuids(mdev);
6495d2c6 1669 drbd_send_sizes(mdev, 1, ddsf);
b411b363
PR		 1670 }
1671
1672 fail:
1673 reply->ret_code = retcode;
1674 return 0;
1675}
1676
1677static 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;
778f271d
PR		 1688 int *rs_plan_s = NULL;
1689 int fifo_size;
b411b363
PR		 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;
265be2d0 1701 sc.on_no_data = DRBD_ON_NO_DATA_DEF;
9a31d716
PR		 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;
0f0601f4
LE		 1705 sc.c_max_rate = DRBD_C_MAX_RATE_DEF;
1706 sc.c_min_rate = DRBD_C_MIN_RATE_DEF;
b411b363
PR		 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
ef50a3e3
LE		 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
b411b363
PR		 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
778f271d
PR		 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
b411b363
PR		 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 }
778f271d
PR		 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
b411b363
PR		 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);
1862fail:
778f271d 1863 kfree(rs_plan_s);
b411b363
PR		 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
1871static 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
194bfb32
LE		 1876 /* If there is still bitmap IO pending, probably because of a previous
1877 * resync just being finished, wait for it before requesting a new resync. */
1878 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
1879
b411b363
PR		 1880 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
1881
1882 if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
1883 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1884
1885 while (retcode == SS_NEED_CONNECTION) {
1886 spin_lock_irq(&mdev->req_lock);
1887 if (mdev->state.conn < C_CONNECTED)
1888 retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL);
1889 spin_unlock_irq(&mdev->req_lock);
1890
1891 if (retcode != SS_NEED_CONNECTION)
1892 break;
1893
1894 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1895 }
1896
1897 reply->ret_code = retcode;
1898 return 0;
1899}
1900
0778286a
PR		 1901static int drbd_bmio_set_susp_al(struct drbd_conf *mdev)
1902{
1903 int rv;
1904
1905 rv = drbd_bmio_set_n_write(mdev);
1906 drbd_suspend_al(mdev);
1907 return rv;
1908}
1909
b411b363
PR		 1910static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1911 struct drbd_nl_cfg_reply *reply)
1912{
0778286a 1913 int retcode;
b411b363 1914
194bfb32
LE		 1915 /* If there is still bitmap IO pending, probably because of a previous
1916 * resync just being finished, wait for it before requesting a new resync. */
1917 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
1918
0778286a
PR		 1919 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED);
1920
1921 if (retcode < SS_SUCCESS) {
1922 if (retcode == SS_NEED_CONNECTION && mdev->state.role == R_PRIMARY) {
1923 /* The peer will get a resync upon connect anyways. Just make that
1924 into a full resync. */
1925 retcode = drbd_request_state(mdev, NS(pdsk, D_INCONSISTENT));
1926 if (retcode >= SS_SUCCESS) {
0778286a
PR		 1927 if (drbd_bitmap_io(mdev, &drbd_bmio_set_susp_al,
1928 "set_n_write from invalidate_peer"))
1929 retcode = ERR_IO_MD_DISK;
1930 }
1931 } else
1932 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
1933 }
b411b363 1934
0778286a 1935 reply->ret_code = retcode;
b411b363
PR		 1936 return 0;
1937}
1938
1939static int drbd_nl_pause_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1940 struct drbd_nl_cfg_reply *reply)
1941{
1942 int retcode = NO_ERROR;
1943
1944 if (drbd_request_state(mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
1945 retcode = ERR_PAUSE_IS_SET;
1946
1947 reply->ret_code = retcode;
1948 return 0;
1949}
1950
1951static int drbd_nl_resume_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1952 struct drbd_nl_cfg_reply *reply)
1953{
1954 int retcode = NO_ERROR;
cd88d030 1955 union drbd_state s;
b411b363 1956
cd88d030
PR		 1957 if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO) {
1958 s = mdev->state;
1959 if (s.conn == C_PAUSED_SYNC_S || s.conn == C_PAUSED_SYNC_T) {
1960 retcode = s.aftr_isp ? ERR_PIC_AFTER_DEP :
1961 s.peer_isp ? ERR_PIC_PEER_DEP : ERR_PAUSE_IS_CLEAR;
1962 } else {
1963 retcode = ERR_PAUSE_IS_CLEAR;
1964 }
1965 }
b411b363
PR		 1966
1967 reply->ret_code = retcode;
1968 return 0;
1969}
1970
1971static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1972 struct drbd_nl_cfg_reply *reply)
1973{
1974 reply->ret_code = drbd_request_state(mdev, NS(susp, 1));
1975
1976 return 0;
1977}
1978
1979static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1980 struct drbd_nl_cfg_reply *reply)
1981{
43a5182c
PR		 1982 if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
1983 drbd_uuid_new_current(mdev);
1984 clear_bit(NEW_CUR_UUID, &mdev->flags);
43a5182c 1985 }
265be2d0 1986 drbd_suspend_io(mdev);
fb22c402 1987 reply->ret_code = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0));
265be2d0
PR		 1988 if (reply->ret_code == SS_SUCCESS) {
1989 if (mdev->state.conn < C_CONNECTED)
1990 tl_clear(mdev);
1991 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED)
1992 tl_restart(mdev, fail_frozen_disk_io);
1993 }
1994 drbd_resume_io(mdev);
1995
b411b363
PR		 1996 return 0;
1997}
1998
1999static int drbd_nl_outdate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2000 struct drbd_nl_cfg_reply *reply)
2001{
2002 reply->ret_code = drbd_request_state(mdev, NS(disk, D_OUTDATED));
2003 return 0;
2004}
2005
2006static int drbd_nl_get_config(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2007 struct drbd_nl_cfg_reply *reply)
2008{
2009 unsigned short *tl;
2010
2011 tl = reply->tag_list;
2012
2013 if (get_ldev(mdev)) {
2014 tl = disk_conf_to_tags(mdev, &mdev->ldev->dc, tl);
2015 put_ldev(mdev);
2016 }
2017
2018 if (get_net_conf(mdev)) {
2019 tl = net_conf_to_tags(mdev, mdev->net_conf, tl);
2020 put_net_conf(mdev);
2021 }
2022 tl = syncer_conf_to_tags(mdev, &mdev->sync_conf, tl);
2023
2024 put_unaligned(TT_END, tl++); /* Close the tag list */
2025
2026 return (int)((char *)tl - (char *)reply->tag_list);
2027}
2028
2029static int drbd_nl_get_state(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2030 struct drbd_nl_cfg_reply *reply)
2031{
2032 unsigned short *tl = reply->tag_list;
2033 union drbd_state s = mdev->state;
2034 unsigned long rs_left;
2035 unsigned int res;
2036
2037 tl = get_state_to_tags(mdev, (struct get_state *)&s, tl);
2038
2039 /* no local ref, no bitmap, no syncer progress. */
2040 if (s.conn >= C_SYNC_SOURCE && s.conn <= C_PAUSED_SYNC_T) {
2041 if (get_ldev(mdev)) {
2042 drbd_get_syncer_progress(mdev, &rs_left, &res);
2043 tl = tl_add_int(tl, T_sync_progress, &res);
2044 put_ldev(mdev);
2045 }
2046 }
2047 put_unaligned(TT_END, tl++); /* Close the tag list */
2048
2049 return (int)((char *)tl - (char *)reply->tag_list);
2050}
2051
2052static int drbd_nl_get_uuids(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2053 struct drbd_nl_cfg_reply *reply)
2054{
2055 unsigned short *tl;
2056
2057 tl = reply->tag_list;
2058
2059 if (get_ldev(mdev)) {
2060 tl = tl_add_blob(tl, T_uuids, mdev->ldev->md.uuid, UI_SIZE*sizeof(u64));
2061 tl = tl_add_int(tl, T_uuids_flags, &mdev->ldev->md.flags);
2062 put_ldev(mdev);
2063 }
2064 put_unaligned(TT_END, tl++); /* Close the tag list */
2065
2066 return (int)((char *)tl - (char *)reply->tag_list);
2067}
2068
2069/**
2070 * drbd_nl_get_timeout_flag() - Used by drbdsetup to find out which timeout value to use
2071 * @mdev: DRBD device.
2072 * @nlp: Netlink/connector packet from drbdsetup
2073 * @reply: Reply packet for drbdsetup
2074 */
2075static int drbd_nl_get_timeout_flag(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2076 struct drbd_nl_cfg_reply *reply)
2077{
2078 unsigned short *tl;
2079 char rv;
2080
2081 tl = reply->tag_list;
2082
2083 rv = mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
2084 test_bit(USE_DEGR_WFC_T, &mdev->flags) ? UT_DEGRADED : UT_DEFAULT;
2085
2086 tl = tl_add_blob(tl, T_use_degraded, &rv, sizeof(rv));
2087 put_unaligned(TT_END, tl++); /* Close the tag list */
2088
2089 return (int)((char *)tl - (char *)reply->tag_list);
2090}
2091
2092static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2093 struct drbd_nl_cfg_reply *reply)
2094{
2095 /* default to resume from last known position, if possible */
2096 struct start_ov args =
2097 { .start_sector = mdev->ov_start_sector };
2098
2099 if (!start_ov_from_tags(mdev, nlp->tag_list, &args)) {
2100 reply->ret_code = ERR_MANDATORY_TAG;
2101 return 0;
2102 }
2103 /* w_make_ov_request expects position to be aligned */
2104 mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT;
2105 reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
2106 return 0;
2107}
2108
2109
2110static int drbd_nl_new_c_uuid(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2111 struct drbd_nl_cfg_reply *reply)
2112{
2113 int retcode = NO_ERROR;
2114 int skip_initial_sync = 0;
2115 int err;
2116
2117 struct new_c_uuid args;
2118
2119 memset(&args, 0, sizeof(struct new_c_uuid));
2120 if (!new_c_uuid_from_tags(mdev, nlp->tag_list, &args)) {
2121 reply->ret_code = ERR_MANDATORY_TAG;
2122 return 0;
2123 }
2124
2125 mutex_lock(&mdev->state_mutex); /* Protects us against serialized state changes. */
2126
2127 if (!get_ldev(mdev)) {
2128 retcode = ERR_NO_DISK;
2129 goto out;
2130 }
2131
2132 /* this is "skip initial sync", assume to be clean */
2133 if (mdev->state.conn == C_CONNECTED && mdev->agreed_pro_version >= 90 &&
2134 mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
2135 dev_info(DEV, "Preparing to skip initial sync\n");
2136 skip_initial_sync = 1;
2137 } else if (mdev->state.conn != C_STANDALONE) {
2138 retcode = ERR_CONNECTED;
2139 goto out_dec;
2140 }
2141
2142 drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
2143 drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
2144
2145 if (args.clear_bm) {
2146 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, "clear_n_write from new_c_uuid");
2147 if (err) {
2148 dev_err(DEV, "Writing bitmap failed with %d\n",err);
2149 retcode = ERR_IO_MD_DISK;
2150 }
2151 if (skip_initial_sync) {
2152 drbd_send_uuids_skip_initial_sync(mdev);
2153 _drbd_uuid_set(mdev, UI_BITMAP, 0);
62b0da3a 2154 drbd_print_uuids(mdev, "cleared bitmap UUID");
b411b363
PR		 2155 spin_lock_irq(&mdev->req_lock);
2156 _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
2157 CS_VERBOSE, NULL);
2158 spin_unlock_irq(&mdev->req_lock);
2159 }
2160 }
2161
2162 drbd_md_sync(mdev);
2163out_dec:
2164 put_ldev(mdev);
2165out:
2166 mutex_unlock(&mdev->state_mutex);
2167
2168 reply->ret_code = retcode;
2169 return 0;
2170}
2171
b411b363
PR		 2172struct cn_handler_struct {
2173 int (*function)(struct drbd_conf *,
2174 struct drbd_nl_cfg_req *,
2175 struct drbd_nl_cfg_reply *);
2176 int reply_body_size;
2177};
2178
2179static struct cn_handler_struct cnd_table[] = {
2180 [ P_primary ] = { &drbd_nl_primary, 0 },
2181 [ P_secondary ] = { &drbd_nl_secondary, 0 },
2182 [ P_disk_conf ] = { &drbd_nl_disk_conf, 0 },
2183 [ P_detach ] = { &drbd_nl_detach, 0 },
2184 [ P_net_conf ] = { &drbd_nl_net_conf, 0 },
2185 [ P_disconnect ] = { &drbd_nl_disconnect, 0 },
2186 [ P_resize ] = { &drbd_nl_resize, 0 },
2187 [ P_syncer_conf ] = { &drbd_nl_syncer_conf, 0 },
2188 [ P_invalidate ] = { &drbd_nl_invalidate, 0 },
2189 [ P_invalidate_peer ] = { &drbd_nl_invalidate_peer, 0 },
2190 [ P_pause_sync ] = { &drbd_nl_pause_sync, 0 },
2191 [ P_resume_sync ] = { &drbd_nl_resume_sync, 0 },
2192 [ P_suspend_io ] = { &drbd_nl_suspend_io, 0 },
2193 [ P_resume_io ] = { &drbd_nl_resume_io, 0 },
2194 [ P_outdate ] = { &drbd_nl_outdate, 0 },
2195 [ P_get_config ] = { &drbd_nl_get_config,
2196 sizeof(struct syncer_conf_tag_len_struct) +
2197 sizeof(struct disk_conf_tag_len_struct) +
2198 sizeof(struct net_conf_tag_len_struct) },
2199 [ P_get_state ] = { &drbd_nl_get_state,
2200 sizeof(struct get_state_tag_len_struct) +
2201 sizeof(struct sync_progress_tag_len_struct) },
2202 [ P_get_uuids ] = { &drbd_nl_get_uuids,
2203 sizeof(struct get_uuids_tag_len_struct) },
2204 [ P_get_timeout_flag ] = { &drbd_nl_get_timeout_flag,
2205 sizeof(struct get_timeout_flag_tag_len_struct)},
2206 [ P_start_ov ] = { &drbd_nl_start_ov, 0 },
2207 [ P_new_c_uuid ] = { &drbd_nl_new_c_uuid, 0 },
2208};
2209
9f5180e5 2210static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp)
b411b363
PR		 2211{
2212 struct drbd_nl_cfg_req *nlp = (struct drbd_nl_cfg_req *)req->data;
2213 struct cn_handler_struct *cm;
2214 struct cn_msg *cn_reply;
2215 struct drbd_nl_cfg_reply *reply;
2216 struct drbd_conf *mdev;
2217 int retcode, rr;
2218 int reply_size = sizeof(struct cn_msg)
2219 + sizeof(struct drbd_nl_cfg_reply)
2220 + sizeof(short int);
2221
2222 if (!try_module_get(THIS_MODULE)) {
2223 printk(KERN_ERR "drbd: try_module_get() failed!\n");
2224 return;
2225 }
2226
9f5180e5
PR		 2227 if (!cap_raised(nsp->eff_cap, CAP_SYS_ADMIN)) {
2228 retcode = ERR_PERM;
2229 goto fail;
2230 }
2231
ef50a3e3
LE		 2232 mdev = ensure_mdev(nlp->drbd_minor,
2233 (nlp->flags & DRBD_NL_CREATE_DEVICE));
b411b363
PR		 2234 if (!mdev) {
2235 retcode = ERR_MINOR_INVALID;
2236 goto fail;
2237 }
2238
42ff269d
LE		 2239 if (nlp->packet_type >= P_nl_after_last_packet ||
2240 nlp->packet_type == P_return_code_only) {
b411b363
PR		 2241 retcode = ERR_PACKET_NR;
2242 goto fail;
2243 }
2244
2245 cm = cnd_table + nlp->packet_type;
2246
2247 /* This may happen if packet number is 0: */
2248 if (cm->function == NULL) {
2249 retcode = ERR_PACKET_NR;
2250 goto fail;
2251 }
2252
2253 reply_size += cm->reply_body_size;
2254
2255 /* allocation not in the IO path, cqueue thread context */
3e3a7766 2256 cn_reply = kzalloc(reply_size, GFP_KERNEL);
b411b363
PR		 2257 if (!cn_reply) {
2258 retcode = ERR_NOMEM;
2259 goto fail;
2260 }
2261 reply = (struct drbd_nl_cfg_reply *) cn_reply->data;
2262
2263 reply->packet_type =
42ff269d 2264 cm->reply_body_size ? nlp->packet_type : P_return_code_only;
b411b363
PR		 2265 reply->minor = nlp->drbd_minor;
2266 reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */
2267 /* reply->tag_list; might be modified by cm->function. */
2268
2269 rr = cm->function(mdev, nlp, reply);
2270
2271 cn_reply->id = req->id;
2272 cn_reply->seq = req->seq;
2273 cn_reply->ack = req->ack + 1;
2274 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + rr;
2275 cn_reply->flags = 0;
2276
b411b363
PR		 2277 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL);
2278 if (rr && rr != -ESRCH)
2279 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2280
2281 kfree(cn_reply);
2282 module_put(THIS_MODULE);
2283 return;
2284 fail:
2285 drbd_nl_send_reply(req, retcode);
2286 module_put(THIS_MODULE);
2287}
2288
2289static atomic_t drbd_nl_seq = ATOMIC_INIT(2); /* two. */
2290
2291static unsigned short *
2292__tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data,
2293 unsigned short len, int nul_terminated)
2294{
2295 unsigned short l = tag_descriptions[tag_number(tag)].max_len;
2296 len = (len < l) ? len : l;
2297 put_unaligned(tag, tl++);
2298 put_unaligned(len, tl++);
2299 memcpy(tl, data, len);
2300 tl = (unsigned short*)((char*)tl + len);
2301 if (nul_terminated)
2302 *((char*)tl - 1) = 0;
2303 return tl;
2304}
2305
2306static unsigned short *
2307tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, int len)
2308{
2309 return __tl_add_blob(tl, tag, data, len, 0);
2310}
2311
2312static unsigned short *
2313tl_add_str(unsigned short *tl, enum drbd_tags tag, const char *str)
2314{
2315 return __tl_add_blob(tl, tag, str, strlen(str)+1, 0);
2316}
2317
2318static unsigned short *
2319tl_add_int(unsigned short *tl, enum drbd_tags tag, const void *val)
2320{
2321 put_unaligned(tag, tl++);
2322 switch(tag_type(tag)) {
2323 case TT_INTEGER:
2324 put_unaligned(sizeof(int), tl++);
2325 put_unaligned(*(int *)val, (int *)tl);
2326 tl = (unsigned short*)((char*)tl+sizeof(int));
2327 break;
2328 case TT_INT64:
2329 put_unaligned(sizeof(u64), tl++);
2330 put_unaligned(*(u64 *)val, (u64 *)tl);
2331 tl = (unsigned short*)((char*)tl+sizeof(u64));
2332 break;
2333 default:
2334 /* someone did something stupid. */
2335 ;
2336 }
2337 return tl;
2338}
2339
2340void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state state)
2341{
2342 char buffer[sizeof(struct cn_msg)+
2343 sizeof(struct drbd_nl_cfg_reply)+
2344 sizeof(struct get_state_tag_len_struct)+
2345 sizeof(short int)];
2346 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2347 struct drbd_nl_cfg_reply *reply =
2348 (struct drbd_nl_cfg_reply *)cn_reply->data;
2349 unsigned short *tl = reply->tag_list;
2350
2351 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2352
2353 tl = get_state_to_tags(mdev, (struct get_state *)&state, tl);
2354
2355 put_unaligned(TT_END, tl++); /* Close the tag list */
2356
2357 cn_reply->id.idx = CN_IDX_DRBD;
2358 cn_reply->id.val = CN_VAL_DRBD;
2359
2360 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2361 cn_reply->ack = 0; /* not used here. */
2362 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2363 (int)((char *)tl - (char *)reply->tag_list);
2364 cn_reply->flags = 0;
2365
2366 reply->packet_type = P_get_state;
2367 reply->minor = mdev_to_minor(mdev);
2368 reply->ret_code = NO_ERROR;
2369
b411b363
PR		 2370 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2371}
2372
2373void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name)
2374{
2375 char buffer[sizeof(struct cn_msg)+
2376 sizeof(struct drbd_nl_cfg_reply)+
2377 sizeof(struct call_helper_tag_len_struct)+
2378 sizeof(short int)];
2379 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2380 struct drbd_nl_cfg_reply *reply =
2381 (struct drbd_nl_cfg_reply *)cn_reply->data;
2382 unsigned short *tl = reply->tag_list;
2383
2384 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2385
2386 tl = tl_add_str(tl, T_helper, helper_name);
2387 put_unaligned(TT_END, tl++); /* Close the tag list */
2388
2389 cn_reply->id.idx = CN_IDX_DRBD;
2390 cn_reply->id.val = CN_VAL_DRBD;
2391
2392 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2393 cn_reply->ack = 0; /* not used here. */
2394 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2395 (int)((char *)tl - (char *)reply->tag_list);
2396 cn_reply->flags = 0;
2397
2398 reply->packet_type = P_call_helper;
2399 reply->minor = mdev_to_minor(mdev);
2400 reply->ret_code = NO_ERROR;
2401
b411b363
PR		 2402 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2403}
2404
2405void drbd_bcast_ee(struct drbd_conf *mdev,
2406 const char *reason, const int dgs,
2407 const char* seen_hash, const char* calc_hash,
2408 const struct drbd_epoch_entry* e)
2409{
2410 struct cn_msg *cn_reply;
2411 struct drbd_nl_cfg_reply *reply;
b411b363 2412 unsigned short *tl;
45bb912b
LE		 2413 struct page *page;
2414 unsigned len;
b411b363
PR		 2415
2416 if (!e)
2417 return;
2418 if (!reason || !reason[0])
2419 return;
2420
2421 /* apparently we have to memcpy twice, first to prepare the data for the
2422 * struct cn_msg, then within cn_netlink_send from the cn_msg to the
2423 * netlink skb. */
2424 /* receiver thread context, which is not in the writeout path (of this node),
2425 * but may be in the writeout path of the _other_ node.
2426 * GFP_NOIO to avoid potential "distributed deadlock". */
3e3a7766 2427 cn_reply = kzalloc(
b411b363
PR		 2428 sizeof(struct cn_msg)+
2429 sizeof(struct drbd_nl_cfg_reply)+
2430 sizeof(struct dump_ee_tag_len_struct)+
2431 sizeof(short int),
2432 GFP_NOIO);
2433
2434 if (!cn_reply) {
2435 dev_err(DEV, "could not kmalloc buffer for drbd_bcast_ee, sector %llu, size %u\n",
2436 (unsigned long long)e->sector, e->size);
2437 return;
2438 }
2439
2440 reply = (struct drbd_nl_cfg_reply*)cn_reply->data;
2441 tl = reply->tag_list;
2442
2443 tl = tl_add_str(tl, T_dump_ee_reason, reason);
2444 tl = tl_add_blob(tl, T_seen_digest, seen_hash, dgs);
2445 tl = tl_add_blob(tl, T_calc_digest, calc_hash, dgs);
2446 tl = tl_add_int(tl, T_ee_sector, &e->sector);
2447 tl = tl_add_int(tl, T_ee_block_id, &e->block_id);
2448
3129b1b9
LE		 2449 /* dump the first 32k */
2450 len = min_t(unsigned, e->size, 32 << 10);
b411b363 2451 put_unaligned(T_ee_data, tl++);
3129b1b9 2452 put_unaligned(len, tl++);
b411b363 2453
45bb912b
LE		 2454 page = e->pages;
2455 page_chain_for_each(page) {
2456 void *d = kmap_atomic(page, KM_USER0);
2457 unsigned l = min_t(unsigned, len, PAGE_SIZE);
2458 memcpy(tl, d, l);
2459 kunmap_atomic(d, KM_USER0);
2460 tl = (unsigned short*)((char*)tl + l);
2461 len -= l;
3129b1b9
LE		 2462 if (len == 0)
2463 break;
b411b363
PR		 2464 }
2465 put_unaligned(TT_END, tl++); /* Close the tag list */
2466
2467 cn_reply->id.idx = CN_IDX_DRBD;
2468 cn_reply->id.val = CN_VAL_DRBD;
2469
2470 cn_reply->seq = atomic_add_return(1,&drbd_nl_seq);
2471 cn_reply->ack = 0; // not used here.
2472 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2473 (int)((char*)tl - (char*)reply->tag_list);
2474 cn_reply->flags = 0;
2475
2476 reply->packet_type = P_dump_ee;
2477 reply->minor = mdev_to_minor(mdev);
2478 reply->ret_code = NO_ERROR;
2479
b411b363
PR		 2480 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2481 kfree(cn_reply);
2482}
2483
2484void drbd_bcast_sync_progress(struct drbd_conf *mdev)
2485{
2486 char buffer[sizeof(struct cn_msg)+
2487 sizeof(struct drbd_nl_cfg_reply)+
2488 sizeof(struct sync_progress_tag_len_struct)+
2489 sizeof(short int)];
2490 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2491 struct drbd_nl_cfg_reply *reply =
2492 (struct drbd_nl_cfg_reply *)cn_reply->data;
2493 unsigned short *tl = reply->tag_list;
2494 unsigned long rs_left;
2495 unsigned int res;
2496
2497 /* no local ref, no bitmap, no syncer progress, no broadcast. */
2498 if (!get_ldev(mdev))
2499 return;
2500 drbd_get_syncer_progress(mdev, &rs_left, &res);
2501 put_ldev(mdev);
2502
2503 tl = tl_add_int(tl, T_sync_progress, &res);
2504 put_unaligned(TT_END, tl++); /* Close the tag list */
2505
2506 cn_reply->id.idx = CN_IDX_DRBD;
2507 cn_reply->id.val = CN_VAL_DRBD;
2508
2509 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2510 cn_reply->ack = 0; /* not used here. */
2511 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2512 (int)((char *)tl - (char *)reply->tag_list);
2513 cn_reply->flags = 0;
2514
2515 reply->packet_type = P_sync_progress;
2516 reply->minor = mdev_to_minor(mdev);
2517 reply->ret_code = NO_ERROR;
2518
b411b363
PR		 2519 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2520}
2521
2522int __init drbd_nl_init(void)
2523{
2524 static struct cb_id cn_id_drbd;
2525 int err, try=10;
2526
2527 cn_id_drbd.val = CN_VAL_DRBD;
2528 do {
2529 cn_id_drbd.idx = cn_idx;
2530 err = cn_add_callback(&cn_id_drbd, "cn_drbd", &drbd_connector_callback);
2531 if (!err)
2532 break;
2533 cn_idx = (cn_idx + CN_IDX_STEP);
2534 } while (try--);
2535
2536 if (err) {
2537 printk(KERN_ERR "drbd: cn_drbd failed to register\n");
2538 return err;
2539 }
2540
2541 return 0;
2542}
2543
2544void drbd_nl_cleanup(void)
2545{
2546 static struct cb_id cn_id_drbd;
2547
2548 cn_id_drbd.idx = cn_idx;
2549 cn_id_drbd.val = CN_VAL_DRBD;
2550
2551 cn_del_callback(&cn_id_drbd);
2552}
2553
2554void drbd_nl_send_reply(struct cn_msg *req, int ret_code)
2555{
2556 char buffer[sizeof(struct cn_msg)+sizeof(struct drbd_nl_cfg_reply)];
2557 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2558 struct drbd_nl_cfg_reply *reply =
2559 (struct drbd_nl_cfg_reply *)cn_reply->data;
2560 int rr;
2561
3e3a7766 2562 memset(buffer, 0, sizeof(buffer));
b411b363
PR		 2563 cn_reply->id = req->id;
2564
2565 cn_reply->seq = req->seq;
2566 cn_reply->ack = req->ack + 1;
2567 cn_reply->len = sizeof(struct drbd_nl_cfg_reply);
2568 cn_reply->flags = 0;
2569
42ff269d 2570 reply->packet_type = P_return_code_only;
b411b363
PR		 2571 reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor;
2572 reply->ret_code = ret_code;
2573
b411b363
PR		 2574 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2575 if (rr && rr != -ESRCH)
2576 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2577}
2578
Linux kernel - Deliverables
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