lru_cache: allow multiple changes per transaction
[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
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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"
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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>
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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
b2fb6dbe 152 if (get_net_conf(mdev->tconn)) {
89e58e75 153 switch (((struct sockaddr *)mdev->tconn->net_conf->peer_addr)->sa_family) {
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154 case AF_INET6:
155 afs = "ipv6";
156 snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI6",
89e58e75 157 &((struct sockaddr_in6 *)mdev->tconn->net_conf->peer_addr)->sin6_addr);
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158 break;
159 case AF_INET:
160 afs = "ipv4";
161 snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4",
89e58e75 162 &((struct sockaddr_in *)mdev->tconn->net_conf->peer_addr)->sin_addr);
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163 break;
164 default:
165 afs = "ssocks";
166 snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4",
89e58e75 167 &((struct sockaddr_in *)mdev->tconn->net_conf->peer_addr)->sin_addr);
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168 }
169 snprintf(af, 20, "DRBD_PEER_AF=%s", afs);
170 envp[3]=af;
171 envp[4]=ad;
b2fb6dbe 172 put_net_conf(mdev->tconn);
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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
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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;
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214 }
215
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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);
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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
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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;
21423fa7 275 union drbd_state ns;
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PR
276
277 nps = drbd_try_outdate_peer(mdev);
21423fa7
PR
278
279 /* Not using
280 drbd_request_state(mdev, NS(pdsk, nps));
99432fcc
PR
281 here, because we might were able to re-establish the connection
282 in the meantime. This can only partially be solved in the state's
283 engine is_valid_state() and is_valid_state_transition()
284 functions.
285
286 nps can be D_INCONSISTENT, D_OUTDATED or D_UNKNOWN.
287 pdsk == D_INCONSISTENT while conn >= C_CONNECTED is valid,
288 therefore we have to have the pre state change check here.
21423fa7 289 */
87eeee41 290 spin_lock_irq(&mdev->tconn->req_lock);
21423fa7
PR
291 ns = mdev->state;
292 if (ns.conn < C_WF_REPORT_PARAMS) {
293 ns.pdsk = nps;
294 _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
295 }
87eeee41 296 spin_unlock_irq(&mdev->tconn->req_lock);
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PR
297
298 return 0;
299}
300
301void drbd_try_outdate_peer_async(struct drbd_conf *mdev)
302{
303 struct task_struct *opa;
304
305 opa = kthread_run(_try_outdate_peer_async, mdev, "drbd%d_a_helper", mdev_to_minor(mdev));
306 if (IS_ERR(opa))
307 dev_err(DEV, "out of mem, failed to invoke fence-peer helper\n");
308}
b411b363 309
bf885f8a
AG
310enum drbd_state_rv
311drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
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312{
313 const int max_tries = 4;
bf885f8a 314 enum drbd_state_rv rv = SS_UNKNOWN_ERROR;
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315 int try = 0;
316 int forced = 0;
317 union drbd_state mask, val;
318 enum drbd_disk_state nps;
319
320 if (new_role == R_PRIMARY)
0625ac19 321 request_ping(mdev->tconn); /* Detect a dead peer ASAP */
b411b363 322
8410da8f 323 mutex_lock(mdev->state_mutex);
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324
325 mask.i = 0; mask.role = R_MASK;
326 val.i = 0; val.role = new_role;
327
328 while (try++ < max_tries) {
bf885f8a 329 rv = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE);
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330
331 /* in case we first succeeded to outdate,
332 * but now suddenly could establish a connection */
bf885f8a 333 if (rv == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
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334 val.pdsk = 0;
335 mask.pdsk = 0;
336 continue;
337 }
338
bf885f8a 339 if (rv == SS_NO_UP_TO_DATE_DISK && force &&
d10a33c6
PR
340 (mdev->state.disk < D_UP_TO_DATE &&
341 mdev->state.disk >= D_INCONSISTENT)) {
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PR
342 mask.disk = D_MASK;
343 val.disk = D_UP_TO_DATE;
344 forced = 1;
345 continue;
346 }
347
bf885f8a 348 if (rv == SS_NO_UP_TO_DATE_DISK &&
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PR
349 mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) {
350 D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
351 nps = drbd_try_outdate_peer(mdev);
352
353 if (nps == D_OUTDATED || nps == D_INCONSISTENT) {
354 val.disk = D_UP_TO_DATE;
355 mask.disk = D_MASK;
356 }
357
358 val.pdsk = nps;
359 mask.pdsk = D_MASK;
360
361 continue;
362 }
363
bf885f8a 364 if (rv == SS_NOTHING_TO_DO)
b411b363 365 goto fail;
bf885f8a 366 if (rv == SS_PRIMARY_NOP && mask.pdsk == 0) {
b411b363
PR
367 nps = drbd_try_outdate_peer(mdev);
368
369 if (force && nps > D_OUTDATED) {
370 dev_warn(DEV, "Forced into split brain situation!\n");
371 nps = D_OUTDATED;
372 }
373
374 mask.pdsk = D_MASK;
375 val.pdsk = nps;
376
377 continue;
378 }
bf885f8a 379 if (rv == SS_TWO_PRIMARIES) {
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PR
380 /* Maybe the peer is detected as dead very soon...
381 retry at most once more in this case. */
89e58e75 382 schedule_timeout_interruptible((mdev->tconn->net_conf->ping_timeo+1)*HZ/10);
b411b363
PR
383 if (try < max_tries)
384 try = max_tries - 1;
385 continue;
386 }
bf885f8a
AG
387 if (rv < SS_SUCCESS) {
388 rv = _drbd_request_state(mdev, mask, val,
b411b363 389 CS_VERBOSE + CS_WAIT_COMPLETE);
bf885f8a 390 if (rv < SS_SUCCESS)
b411b363
PR
391 goto fail;
392 }
393 break;
394 }
395
bf885f8a 396 if (rv < SS_SUCCESS)
b411b363
PR
397 goto fail;
398
399 if (forced)
400 dev_warn(DEV, "Forced to consider local data as UpToDate!\n");
401
402 /* Wait until nothing is on the fly :) */
403 wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0);
404
405 if (new_role == R_SECONDARY) {
81e84650 406 set_disk_ro(mdev->vdisk, true);
b411b363
PR
407 if (get_ldev(mdev)) {
408 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
409 put_ldev(mdev);
410 }
411 } else {
b2fb6dbe 412 if (get_net_conf(mdev->tconn)) {
89e58e75 413 mdev->tconn->net_conf->want_lose = 0;
b2fb6dbe 414 put_net_conf(mdev->tconn);
b411b363 415 }
81e84650 416 set_disk_ro(mdev->vdisk, false);
b411b363
PR
417 if (get_ldev(mdev)) {
418 if (((mdev->state.conn < C_CONNECTED ||
419 mdev->state.pdsk <= D_FAILED)
420 && mdev->ldev->md.uuid[UI_BITMAP] == 0) || forced)
421 drbd_uuid_new_current(mdev);
422
423 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
424 put_ldev(mdev);
425 }
426 }
427
19f843aa
LE
428 /* writeout of activity log covered areas of the bitmap
429 * to stable storage done in after state change already */
b411b363
PR
430
431 if (mdev->state.conn >= C_WF_REPORT_PARAMS) {
432 /* if this was forced, we should consider sync */
433 if (forced)
434 drbd_send_uuids(mdev);
435 drbd_send_state(mdev);
436 }
437
438 drbd_md_sync(mdev);
439
440 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
441 fail:
8410da8f 442 mutex_unlock(mdev->state_mutex);
bf885f8a 443 return rv;
b411b363
PR
444}
445
ef50a3e3
LE
446static struct drbd_conf *ensure_mdev(int minor, int create)
447{
448 struct drbd_conf *mdev;
449
450 if (minor >= minor_count)
451 return NULL;
452
453 mdev = minor_to_mdev(minor);
454
455 if (!mdev && create) {
456 struct gendisk *disk = NULL;
457 mdev = drbd_new_device(minor);
458
459 spin_lock_irq(&drbd_pp_lock);
460 if (minor_table[minor] == NULL) {
461 minor_table[minor] = mdev;
462 disk = mdev->vdisk;
463 mdev = NULL;
464 } /* else: we lost the race */
465 spin_unlock_irq(&drbd_pp_lock);
466
467 if (disk) /* we won the race above */
468 /* in case we ever add a drbd_delete_device(),
469 * don't forget the del_gendisk! */
470 add_disk(disk);
471 else /* we lost the race above */
472 drbd_free_mdev(mdev);
473
474 mdev = minor_to_mdev(minor);
475 }
476
477 return mdev;
478}
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PR
479
480static int drbd_nl_primary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
481 struct drbd_nl_cfg_reply *reply)
482{
483 struct primary primary_args;
484
485 memset(&primary_args, 0, sizeof(struct primary));
486 if (!primary_from_tags(mdev, nlp->tag_list, &primary_args)) {
487 reply->ret_code = ERR_MANDATORY_TAG;
488 return 0;
489 }
490
491 reply->ret_code =
1f552430 492 drbd_set_role(mdev, R_PRIMARY, primary_args.primary_force);
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PR
493
494 return 0;
495}
496
497static int drbd_nl_secondary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
498 struct drbd_nl_cfg_reply *reply)
499{
500 reply->ret_code = drbd_set_role(mdev, R_SECONDARY, 0);
501
502 return 0;
503}
504
505/* initializes the md.*_offset members, so we are able to find
506 * the on disk meta data */
507static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
508 struct drbd_backing_dev *bdev)
509{
510 sector_t md_size_sect = 0;
511 switch (bdev->dc.meta_dev_idx) {
512 default:
513 /* v07 style fixed size indexed meta data */
514 bdev->md.md_size_sect = MD_RESERVED_SECT;
515 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
516 bdev->md.al_offset = MD_AL_OFFSET;
517 bdev->md.bm_offset = MD_BM_OFFSET;
518 break;
519 case DRBD_MD_INDEX_FLEX_EXT:
520 /* just occupy the full device; unit: sectors */
521 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
522 bdev->md.md_offset = 0;
523 bdev->md.al_offset = MD_AL_OFFSET;
524 bdev->md.bm_offset = MD_BM_OFFSET;
525 break;
526 case DRBD_MD_INDEX_INTERNAL:
527 case DRBD_MD_INDEX_FLEX_INT:
528 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
529 /* al size is still fixed */
530 bdev->md.al_offset = -MD_AL_MAX_SIZE;
531 /* we need (slightly less than) ~ this much bitmap sectors: */
532 md_size_sect = drbd_get_capacity(bdev->backing_bdev);
533 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
534 md_size_sect = BM_SECT_TO_EXT(md_size_sect);
535 md_size_sect = ALIGN(md_size_sect, 8);
536
537 /* plus the "drbd meta data super block",
538 * and the activity log; */
539 md_size_sect += MD_BM_OFFSET;
540
541 bdev->md.md_size_sect = md_size_sect;
542 /* bitmap offset is adjusted by 'super' block size */
543 bdev->md.bm_offset = -md_size_sect + MD_AL_OFFSET;
544 break;
545 }
546}
547
4b0715f0 548/* input size is expected to be in KB */
b411b363
PR
549char *ppsize(char *buf, unsigned long long size)
550{
4b0715f0
LE
551 /* Needs 9 bytes at max including trailing NUL:
552 * -1ULL ==> "16384 EB" */
b411b363
PR
553 static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
554 int base = 0;
4b0715f0 555 while (size >= 10000 && base < sizeof(units)-1) {
b411b363
PR
556 /* shift + round */
557 size = (size >> 10) + !!(size & (1<<9));
558 base++;
559 }
4b0715f0 560 sprintf(buf, "%u %cB", (unsigned)size, units[base]);
b411b363
PR
561
562 return buf;
563}
564
565/* there is still a theoretical deadlock when called from receiver
566 * on an D_INCONSISTENT R_PRIMARY:
567 * remote READ does inc_ap_bio, receiver would need to receive answer
568 * packet from remote to dec_ap_bio again.
569 * receiver receive_sizes(), comes here,
570 * waits for ap_bio_cnt == 0. -> deadlock.
571 * but this cannot happen, actually, because:
572 * R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable
573 * (not connected, or bad/no disk on peer):
574 * see drbd_fail_request_early, ap_bio_cnt is zero.
575 * R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET:
576 * peer may not initiate a resize.
577 */
578void drbd_suspend_io(struct drbd_conf *mdev)
579{
580 set_bit(SUSPEND_IO, &mdev->flags);
fb22c402 581 if (is_susp(mdev->state))
265be2d0 582 return;
b411b363
PR
583 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
584}
585
586void drbd_resume_io(struct drbd_conf *mdev)
587{
588 clear_bit(SUSPEND_IO, &mdev->flags);
589 wake_up(&mdev->misc_wait);
590}
591
592/**
593 * drbd_determine_dev_size() - Sets the right device size obeying all constraints
594 * @mdev: DRBD device.
595 *
596 * Returns 0 on success, negative return values indicate errors.
597 * You should call drbd_md_sync() after calling this function.
598 */
24c4830c 599enum determine_dev_size drbd_determine_dev_size(struct drbd_conf *mdev, enum dds_flags flags) __must_hold(local)
b411b363
PR
600{
601 sector_t prev_first_sect, prev_size; /* previous meta location */
602 sector_t la_size;
603 sector_t size;
604 char ppb[10];
605
606 int md_moved, la_size_changed;
607 enum determine_dev_size rv = unchanged;
608
609 /* race:
610 * application request passes inc_ap_bio,
611 * but then cannot get an AL-reference.
612 * this function later may wait on ap_bio_cnt == 0. -> deadlock.
613 *
614 * to avoid that:
615 * Suspend IO right here.
616 * still lock the act_log to not trigger ASSERTs there.
617 */
618 drbd_suspend_io(mdev);
619
620 /* no wait necessary anymore, actually we could assert that */
621 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
622
623 prev_first_sect = drbd_md_first_sector(mdev->ldev);
624 prev_size = mdev->ldev->md.md_size_sect;
625 la_size = mdev->ldev->md.la_size_sect;
626
627 /* TODO: should only be some assert here, not (re)init... */
628 drbd_md_set_sector_offsets(mdev, mdev->ldev);
629
d845030f 630 size = drbd_new_dev_size(mdev, mdev->ldev, flags & DDSF_FORCED);
b411b363
PR
631
632 if (drbd_get_capacity(mdev->this_bdev) != size ||
633 drbd_bm_capacity(mdev) != size) {
634 int err;
02d9a94b 635 err = drbd_bm_resize(mdev, size, !(flags & DDSF_NO_RESYNC));
b411b363
PR
636 if (unlikely(err)) {
637 /* currently there is only one error: ENOMEM! */
638 size = drbd_bm_capacity(mdev)>>1;
639 if (size == 0) {
640 dev_err(DEV, "OUT OF MEMORY! "
641 "Could not allocate bitmap!\n");
642 } else {
643 dev_err(DEV, "BM resizing failed. "
644 "Leaving size unchanged at size = %lu KB\n",
645 (unsigned long)size);
646 }
647 rv = dev_size_error;
648 }
649 /* racy, see comments above. */
650 drbd_set_my_capacity(mdev, size);
651 mdev->ldev->md.la_size_sect = size;
652 dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1),
653 (unsigned long long)size>>1);
654 }
655 if (rv == dev_size_error)
656 goto out;
657
658 la_size_changed = (la_size != mdev->ldev->md.la_size_sect);
659
660 md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev)
661 || prev_size != mdev->ldev->md.md_size_sect;
662
663 if (la_size_changed || md_moved) {
24dccabb
AG
664 int err;
665
b411b363
PR
666 drbd_al_shrink(mdev); /* All extents inactive. */
667 dev_info(DEV, "Writing the whole bitmap, %s\n",
668 la_size_changed && md_moved ? "size changed and md moved" :
669 la_size_changed ? "size changed" : "md moved");
20ceb2b2
LE
670 /* next line implicitly does drbd_suspend_io()+drbd_resume_io() */
671 err = drbd_bitmap_io(mdev, &drbd_bm_write,
672 "size changed", BM_LOCKED_MASK);
24dccabb
AG
673 if (err) {
674 rv = dev_size_error;
675 goto out;
676 }
b411b363
PR
677 drbd_md_mark_dirty(mdev);
678 }
679
680 if (size > la_size)
681 rv = grew;
682 if (size < la_size)
683 rv = shrunk;
684out:
685 lc_unlock(mdev->act_log);
686 wake_up(&mdev->al_wait);
687 drbd_resume_io(mdev);
688
689 return rv;
690}
691
692sector_t
a393db6f 693drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev, int assume_peer_has_space)
b411b363
PR
694{
695 sector_t p_size = mdev->p_size; /* partner's disk size. */
696 sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */
697 sector_t m_size; /* my size */
698 sector_t u_size = bdev->dc.disk_size; /* size requested by user. */
699 sector_t size = 0;
700
701 m_size = drbd_get_max_capacity(bdev);
702
a393db6f
PR
703 if (mdev->state.conn < C_CONNECTED && assume_peer_has_space) {
704 dev_warn(DEV, "Resize while not connected was forced by the user!\n");
705 p_size = m_size;
706 }
707
b411b363
PR
708 if (p_size && m_size) {
709 size = min_t(sector_t, p_size, m_size);
710 } else {
711 if (la_size) {
712 size = la_size;
713 if (m_size && m_size < size)
714 size = m_size;
715 if (p_size && p_size < size)
716 size = p_size;
717 } else {
718 if (m_size)
719 size = m_size;
720 if (p_size)
721 size = p_size;
722 }
723 }
724
725 if (size == 0)
726 dev_err(DEV, "Both nodes diskless!\n");
727
728 if (u_size) {
729 if (u_size > size)
730 dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n",
731 (unsigned long)u_size>>1, (unsigned long)size>>1);
732 else
733 size = u_size;
734 }
735
736 return size;
737}
738
739/**
740 * drbd_check_al_size() - Ensures that the AL is of the right size
741 * @mdev: DRBD device.
742 *
743 * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
744 * failed, and 0 on success. You should call drbd_md_sync() after you called
745 * this function.
746 */
747static int drbd_check_al_size(struct drbd_conf *mdev)
748{
749 struct lru_cache *n, *t;
750 struct lc_element *e;
751 unsigned int in_use;
752 int i;
753
841ce241 754 if (!expect(mdev->sync_conf.al_extents >= 7))
b411b363
PR
755 mdev->sync_conf.al_extents = 127;
756
757 if (mdev->act_log &&
758 mdev->act_log->nr_elements == mdev->sync_conf.al_extents)
759 return 0;
760
761 in_use = 0;
762 t = mdev->act_log;
46a15bc3 763 n = lc_create("act_log", drbd_al_ext_cache, 1,
b411b363
PR
764 mdev->sync_conf.al_extents, sizeof(struct lc_element), 0);
765
766 if (n == NULL) {
767 dev_err(DEV, "Cannot allocate act_log lru!\n");
768 return -ENOMEM;
769 }
770 spin_lock_irq(&mdev->al_lock);
771 if (t) {
772 for (i = 0; i < t->nr_elements; i++) {
773 e = lc_element_by_index(t, i);
774 if (e->refcnt)
775 dev_err(DEV, "refcnt(%d)==%d\n",
776 e->lc_number, e->refcnt);
777 in_use += e->refcnt;
778 }
779 }
780 if (!in_use)
781 mdev->act_log = n;
782 spin_unlock_irq(&mdev->al_lock);
783 if (in_use) {
784 dev_err(DEV, "Activity log still in use!\n");
785 lc_destroy(n);
786 return -EBUSY;
787 } else {
788 if (t)
789 lc_destroy(t);
790 }
791 drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */
792 return 0;
793}
794
99432fcc 795static void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_bio_size)
b411b363
PR
796{
797 struct request_queue * const q = mdev->rq_queue;
99432fcc
PR
798 int max_hw_sectors = max_bio_size >> 9;
799 int max_segments = 0;
800
801 if (get_ldev_if_state(mdev, D_ATTACHING)) {
802 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
803
804 max_hw_sectors = min(queue_max_hw_sectors(b), max_bio_size >> 9);
805 max_segments = mdev->ldev->dc.max_bio_bvecs;
806 put_ldev(mdev);
807 }
b411b363 808
b411b363 809 blk_queue_logical_block_size(q, 512);
1816a2b4
LE
810 blk_queue_max_hw_sectors(q, max_hw_sectors);
811 /* This is the workaround for "bio would need to, but cannot, be split" */
812 blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
813 blk_queue_segment_boundary(q, PAGE_CACHE_SIZE-1);
b411b363 814
99432fcc
PR
815 if (get_ldev_if_state(mdev, D_ATTACHING)) {
816 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
817
818 blk_queue_stack_limits(q, b);
819
820 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
821 dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
822 q->backing_dev_info.ra_pages,
823 b->backing_dev_info.ra_pages);
824 q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
825 }
826 put_ldev(mdev);
827 }
828}
829
830void drbd_reconsider_max_bio_size(struct drbd_conf *mdev)
831{
832 int now, new, local, peer;
833
834 now = queue_max_hw_sectors(mdev->rq_queue) << 9;
835 local = mdev->local_max_bio_size; /* Eventually last known value, from volatile memory */
836 peer = mdev->peer_max_bio_size; /* Eventually last known value, from meta data */
b411b363 837
99432fcc
PR
838 if (get_ldev_if_state(mdev, D_ATTACHING)) {
839 local = queue_max_hw_sectors(mdev->ldev->backing_bdev->bd_disk->queue) << 9;
840 mdev->local_max_bio_size = local;
841 put_ldev(mdev);
b411b363 842 }
99432fcc
PR
843
844 /* We may ignore peer limits if the peer is modern enough.
845 Because new from 8.3.8 onwards the peer can use multiple
846 BIOs for a single peer_request */
847 if (mdev->state.conn >= C_CONNECTED) {
31890f4a 848 if (mdev->tconn->agreed_pro_version < 94)
99432fcc 849 peer = mdev->peer_max_bio_size;
31890f4a 850 else if (mdev->tconn->agreed_pro_version == 94)
99432fcc
PR
851 peer = DRBD_MAX_SIZE_H80_PACKET;
852 else /* drbd 8.3.8 onwards */
853 peer = DRBD_MAX_BIO_SIZE;
854 }
855
856 new = min_t(int, local, peer);
857
858 if (mdev->state.role == R_PRIMARY && new < now)
859 dev_err(DEV, "ASSERT FAILED new < now; (%d < %d)\n", new, now);
860
861 if (new != now)
862 dev_info(DEV, "max BIO size = %u\n", new);
863
864 drbd_setup_queue_param(mdev, new);
b411b363
PR
865}
866
867/* serialize deconfig (worker exiting, doing cleanup)
868 * and reconfig (drbdsetup disk, drbdsetup net)
869 *
c518d04f
LE
870 * Wait for a potentially exiting worker, then restart it,
871 * or start a new one. Flush any pending work, there may still be an
872 * after_state_change queued.
b411b363
PR
873 */
874static void drbd_reconfig_start(struct drbd_conf *mdev)
875{
6c6c7951 876 wait_event(mdev->state_wait, !test_and_set_bit(CONFIG_PENDING, &mdev->flags));
b411b363 877 wait_event(mdev->state_wait, !test_bit(DEVICE_DYING, &mdev->flags));
e6b3ea83 878 drbd_thread_start(&mdev->tconn->worker);
a21e9298 879 drbd_flush_workqueue(mdev);
b411b363
PR
880}
881
882/* if still unconfigured, stops worker again.
883 * if configured now, clears CONFIG_PENDING.
884 * wakes potential waiters */
885static void drbd_reconfig_done(struct drbd_conf *mdev)
886{
87eeee41 887 spin_lock_irq(&mdev->tconn->req_lock);
b411b363
PR
888 if (mdev->state.disk == D_DISKLESS &&
889 mdev->state.conn == C_STANDALONE &&
890 mdev->state.role == R_SECONDARY) {
891 set_bit(DEVICE_DYING, &mdev->flags);
e6b3ea83 892 drbd_thread_stop_nowait(&mdev->tconn->worker);
b411b363
PR
893 } else
894 clear_bit(CONFIG_PENDING, &mdev->flags);
87eeee41 895 spin_unlock_irq(&mdev->tconn->req_lock);
b411b363
PR
896 wake_up(&mdev->state_wait);
897}
898
0778286a
PR
899/* Make sure IO is suspended before calling this function(). */
900static void drbd_suspend_al(struct drbd_conf *mdev)
901{
902 int s = 0;
903
61610420 904 if (!lc_try_lock(mdev->act_log)) {
0778286a
PR
905 dev_warn(DEV, "Failed to lock al in drbd_suspend_al()\n");
906 return;
907 }
908
61610420 909 drbd_al_shrink(mdev);
87eeee41 910 spin_lock_irq(&mdev->tconn->req_lock);
0778286a
PR
911 if (mdev->state.conn < C_CONNECTED)
912 s = !test_and_set_bit(AL_SUSPENDED, &mdev->flags);
87eeee41 913 spin_unlock_irq(&mdev->tconn->req_lock);
61610420 914 lc_unlock(mdev->act_log);
0778286a
PR
915
916 if (s)
917 dev_info(DEV, "Suspended AL updates\n");
918}
919
b411b363
PR
920/* does always return 0;
921 * interesting return code is in reply->ret_code */
922static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
923 struct drbd_nl_cfg_reply *reply)
924{
116676ca 925 enum drbd_ret_code retcode;
b411b363
PR
926 enum determine_dev_size dd;
927 sector_t max_possible_sectors;
928 sector_t min_md_device_sectors;
929 struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
e525fd89 930 struct block_device *bdev;
b411b363
PR
931 struct lru_cache *resync_lru = NULL;
932 union drbd_state ns, os;
f2024e7c 933 enum drbd_state_rv rv;
b411b363
PR
934 int cp_discovered = 0;
935 int logical_block_size;
936
937 drbd_reconfig_start(mdev);
938
939 /* if you want to reconfigure, please tear down first */
940 if (mdev->state.disk > D_DISKLESS) {
941 retcode = ERR_DISK_CONFIGURED;
942 goto fail;
943 }
82f59cc6
LE
944 /* It may just now have detached because of IO error. Make sure
945 * drbd_ldev_destroy is done already, we may end up here very fast,
946 * e.g. if someone calls attach from the on-io-error handler,
947 * to realize a "hot spare" feature (not that I'd recommend that) */
948 wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt));
b411b363
PR
949
950 /* allocation not in the IO path, cqueue thread context */
951 nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
952 if (!nbc) {
953 retcode = ERR_NOMEM;
954 goto fail;
955 }
956
957 nbc->dc.disk_size = DRBD_DISK_SIZE_SECT_DEF;
958 nbc->dc.on_io_error = DRBD_ON_IO_ERROR_DEF;
959 nbc->dc.fencing = DRBD_FENCING_DEF;
960 nbc->dc.max_bio_bvecs = DRBD_MAX_BIO_BVECS_DEF;
961
962 if (!disk_conf_from_tags(mdev, nlp->tag_list, &nbc->dc)) {
963 retcode = ERR_MANDATORY_TAG;
964 goto fail;
965 }
966
967 if (nbc->dc.meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
968 retcode = ERR_MD_IDX_INVALID;
969 goto fail;
970 }
971
b2fb6dbe 972 if (get_net_conf(mdev->tconn)) {
89e58e75 973 int prot = mdev->tconn->net_conf->wire_protocol;
b2fb6dbe 974 put_net_conf(mdev->tconn);
47ff2d0a
PR
975 if (nbc->dc.fencing == FP_STONITH && prot == DRBD_PROT_A) {
976 retcode = ERR_STONITH_AND_PROT_A;
977 goto fail;
978 }
979 }
980
d4d77629
TH
981 bdev = blkdev_get_by_path(nbc->dc.backing_dev,
982 FMODE_READ | FMODE_WRITE | FMODE_EXCL, mdev);
e525fd89 983 if (IS_ERR(bdev)) {
b411b363 984 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev,
e525fd89 985 PTR_ERR(bdev));
b411b363
PR
986 retcode = ERR_OPEN_DISK;
987 goto fail;
988 }
e525fd89
TH
989 nbc->backing_bdev = bdev;
990
991 /*
992 * meta_dev_idx >= 0: external fixed size, possibly multiple
993 * drbd sharing one meta device. TODO in that case, paranoia
994 * check that [md_bdev, meta_dev_idx] is not yet used by some
995 * other drbd minor! (if you use drbd.conf + drbdadm, that
996 * should check it for you already; but if you don't, or
997 * someone fooled it, we need to double check here)
998 */
d4d77629
TH
999 bdev = blkdev_get_by_path(nbc->dc.meta_dev,
1000 FMODE_READ | FMODE_WRITE | FMODE_EXCL,
1001 (nbc->dc.meta_dev_idx < 0) ?
1002 (void *)mdev : (void *)drbd_m_holder);
e525fd89 1003 if (IS_ERR(bdev)) {
b411b363 1004 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev,
e525fd89 1005 PTR_ERR(bdev));
b411b363
PR
1006 retcode = ERR_OPEN_MD_DISK;
1007 goto fail;
1008 }
e525fd89 1009 nbc->md_bdev = bdev;
b411b363 1010
e525fd89
TH
1011 if ((nbc->backing_bdev == nbc->md_bdev) !=
1012 (nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
1013 nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
1014 retcode = ERR_MD_IDX_INVALID;
b411b363
PR
1015 goto fail;
1016 }
1017
1018 resync_lru = lc_create("resync", drbd_bm_ext_cache,
46a15bc3 1019 1, 61, sizeof(struct bm_extent),
b411b363
PR
1020 offsetof(struct bm_extent, lce));
1021 if (!resync_lru) {
1022 retcode = ERR_NOMEM;
e525fd89 1023 goto fail;
b411b363
PR
1024 }
1025
1026 /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
1027 drbd_md_set_sector_offsets(mdev, nbc);
1028
1029 if (drbd_get_max_capacity(nbc) < nbc->dc.disk_size) {
1030 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
1031 (unsigned long long) drbd_get_max_capacity(nbc),
1032 (unsigned long long) nbc->dc.disk_size);
1033 retcode = ERR_DISK_TO_SMALL;
e525fd89 1034 goto fail;
b411b363
PR
1035 }
1036
1037 if (nbc->dc.meta_dev_idx < 0) {
1038 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
1039 /* at least one MB, otherwise it does not make sense */
1040 min_md_device_sectors = (2<<10);
1041 } else {
1042 max_possible_sectors = DRBD_MAX_SECTORS;
1043 min_md_device_sectors = MD_RESERVED_SECT * (nbc->dc.meta_dev_idx + 1);
1044 }
1045
b411b363
PR
1046 if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
1047 retcode = ERR_MD_DISK_TO_SMALL;
1048 dev_warn(DEV, "refusing attach: md-device too small, "
1049 "at least %llu sectors needed for this meta-disk type\n",
1050 (unsigned long long) min_md_device_sectors);
e525fd89 1051 goto fail;
b411b363
PR
1052 }
1053
1054 /* Make sure the new disk is big enough
1055 * (we may currently be R_PRIMARY with no local disk...) */
1056 if (drbd_get_max_capacity(nbc) <
1057 drbd_get_capacity(mdev->this_bdev)) {
1058 retcode = ERR_DISK_TO_SMALL;
e525fd89 1059 goto fail;
b411b363
PR
1060 }
1061
1062 nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
1063
1352994b
LE
1064 if (nbc->known_size > max_possible_sectors) {
1065 dev_warn(DEV, "==> truncating very big lower level device "
1066 "to currently maximum possible %llu sectors <==\n",
1067 (unsigned long long) max_possible_sectors);
1068 if (nbc->dc.meta_dev_idx >= 0)
1069 dev_warn(DEV, "==>> using internal or flexible "
1070 "meta data may help <<==\n");
1071 }
1072
b411b363
PR
1073 drbd_suspend_io(mdev);
1074 /* also wait for the last barrier ack. */
fb22c402 1075 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt) || is_susp(mdev->state));
b411b363 1076 /* and for any other previously queued work */
a21e9298 1077 drbd_flush_workqueue(mdev);
b411b363 1078
f2024e7c
AG
1079 rv = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
1080 retcode = rv; /* FIXME: Type mismatch. */
b411b363 1081 drbd_resume_io(mdev);
f2024e7c 1082 if (rv < SS_SUCCESS)
e525fd89 1083 goto fail;
b411b363
PR
1084
1085 if (!get_ldev_if_state(mdev, D_ATTACHING))
1086 goto force_diskless;
1087
1088 drbd_md_set_sector_offsets(mdev, nbc);
1089
4aa83b7b
LE
1090 /* allocate a second IO page if logical_block_size != 512 */
1091 logical_block_size = bdev_logical_block_size(nbc->md_bdev);
1092 if (logical_block_size == 0)
1093 logical_block_size = MD_SECTOR_SIZE;
1094
1095 if (logical_block_size != MD_SECTOR_SIZE) {
1096 if (!mdev->md_io_tmpp) {
1097 struct page *page = alloc_page(GFP_NOIO);
1098 if (!page)
1099 goto force_diskless_dec;
1100
1101 dev_warn(DEV, "Meta data's bdev logical_block_size = %d != %d\n",
1102 logical_block_size, MD_SECTOR_SIZE);
1103 dev_warn(DEV, "Workaround engaged (has performance impact).\n");
1104
1105 mdev->md_io_tmpp = page;
1106 }
1107 }
1108
b411b363
PR
1109 if (!mdev->bitmap) {
1110 if (drbd_bm_init(mdev)) {
1111 retcode = ERR_NOMEM;
1112 goto force_diskless_dec;
1113 }
1114 }
1115
1116 retcode = drbd_md_read(mdev, nbc);
1117 if (retcode != NO_ERROR)
1118 goto force_diskless_dec;
1119
1120 if (mdev->state.conn < C_CONNECTED &&
1121 mdev->state.role == R_PRIMARY &&
1122 (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
1123 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
1124 (unsigned long long)mdev->ed_uuid);
1125 retcode = ERR_DATA_NOT_CURRENT;
1126 goto force_diskless_dec;
1127 }
1128
1129 /* Since we are diskless, fix the activity log first... */
1130 if (drbd_check_al_size(mdev)) {
1131 retcode = ERR_NOMEM;
1132 goto force_diskless_dec;
1133 }
1134
1135 /* Prevent shrinking of consistent devices ! */
1136 if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
a393db6f 1137 drbd_new_dev_size(mdev, nbc, 0) < nbc->md.la_size_sect) {
b411b363
PR
1138 dev_warn(DEV, "refusing to truncate a consistent device\n");
1139 retcode = ERR_DISK_TO_SMALL;
1140 goto force_diskless_dec;
1141 }
1142
1143 if (!drbd_al_read_log(mdev, nbc)) {
1144 retcode = ERR_IO_MD_DISK;
1145 goto force_diskless_dec;
1146 }
1147
b411b363
PR
1148 /* Reset the "barriers don't work" bits here, then force meta data to
1149 * be written, to ensure we determine if barriers are supported. */
1150 if (nbc->dc.no_md_flush)
a8a4e51e 1151 set_bit(MD_NO_FUA, &mdev->flags);
b411b363 1152 else
a8a4e51e 1153 clear_bit(MD_NO_FUA, &mdev->flags);
b411b363
PR
1154
1155 /* Point of no return reached.
1156 * Devices and memory are no longer released by error cleanup below.
1157 * now mdev takes over responsibility, and the state engine should
1158 * clean it up somewhere. */
1159 D_ASSERT(mdev->ldev == NULL);
1160 mdev->ldev = nbc;
1161 mdev->resync = resync_lru;
1162 nbc = NULL;
1163 resync_lru = NULL;
1164
2451fc3b
PR
1165 mdev->write_ordering = WO_bdev_flush;
1166 drbd_bump_write_ordering(mdev, WO_bdev_flush);
b411b363
PR
1167
1168 if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
1169 set_bit(CRASHED_PRIMARY, &mdev->flags);
1170 else
1171 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1172
894c6a94 1173 if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
fb22c402 1174 !(mdev->state.role == R_PRIMARY && mdev->state.susp_nod)) {
b411b363
PR
1175 set_bit(CRASHED_PRIMARY, &mdev->flags);
1176 cp_discovered = 1;
1177 }
1178
1179 mdev->send_cnt = 0;
1180 mdev->recv_cnt = 0;
1181 mdev->read_cnt = 0;
1182 mdev->writ_cnt = 0;
1183
99432fcc 1184 drbd_reconsider_max_bio_size(mdev);
b411b363
PR
1185
1186 /* If I am currently not R_PRIMARY,
1187 * but meta data primary indicator is set,
1188 * I just now recover from a hard crash,
1189 * and have been R_PRIMARY before that crash.
1190 *
1191 * Now, if I had no connection before that crash
1192 * (have been degraded R_PRIMARY), chances are that
1193 * I won't find my peer now either.
1194 *
1195 * In that case, and _only_ in that case,
1196 * we use the degr-wfc-timeout instead of the default,
1197 * so we can automatically recover from a crash of a
1198 * degraded but active "cluster" after a certain timeout.
1199 */
1200 clear_bit(USE_DEGR_WFC_T, &mdev->flags);
1201 if (mdev->state.role != R_PRIMARY &&
1202 drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1203 !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
1204 set_bit(USE_DEGR_WFC_T, &mdev->flags);
1205
24c4830c 1206 dd = drbd_determine_dev_size(mdev, 0);
b411b363
PR
1207 if (dd == dev_size_error) {
1208 retcode = ERR_NOMEM_BITMAP;
1209 goto force_diskless_dec;
1210 } else if (dd == grew)
1211 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
1212
1213 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
1214 dev_info(DEV, "Assuming that all blocks are out of sync "
1215 "(aka FullSync)\n");
20ceb2b2
LE
1216 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write,
1217 "set_n_write from attaching", BM_LOCKED_MASK)) {
b411b363
PR
1218 retcode = ERR_IO_MD_DISK;
1219 goto force_diskless_dec;
1220 }
1221 } else {
20ceb2b2
LE
1222 if (drbd_bitmap_io(mdev, &drbd_bm_read,
1223 "read from attaching", BM_LOCKED_MASK) < 0) {
b411b363
PR
1224 retcode = ERR_IO_MD_DISK;
1225 goto force_diskless_dec;
1226 }
1227 }
1228
1229 if (cp_discovered) {
1230 drbd_al_apply_to_bm(mdev);
20ceb2b2
LE
1231 if (drbd_bitmap_io(mdev, &drbd_bm_write,
1232 "crashed primary apply AL", BM_LOCKED_MASK)) {
19f843aa
LE
1233 retcode = ERR_IO_MD_DISK;
1234 goto force_diskless_dec;
1235 }
b411b363
PR
1236 }
1237
0778286a
PR
1238 if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev))
1239 drbd_suspend_al(mdev); /* IO is still suspended here... */
1240
87eeee41 1241 spin_lock_irq(&mdev->tconn->req_lock);
b411b363
PR
1242 os = mdev->state;
1243 ns.i = os.i;
1244 /* If MDF_CONSISTENT is not set go into inconsistent state,
1245 otherwise investigate MDF_WasUpToDate...
1246 If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1247 otherwise into D_CONSISTENT state.
1248 */
1249 if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
1250 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
1251 ns.disk = D_CONSISTENT;
1252 else
1253 ns.disk = D_OUTDATED;
1254 } else {
1255 ns.disk = D_INCONSISTENT;
1256 }
1257
1258 if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
1259 ns.pdsk = D_OUTDATED;
1260
1261 if ( ns.disk == D_CONSISTENT &&
1262 (ns.pdsk == D_OUTDATED || mdev->ldev->dc.fencing == FP_DONT_CARE))
1263 ns.disk = D_UP_TO_DATE;
1264
1265 /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1266 MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1267 this point, because drbd_request_state() modifies these
1268 flags. */
1269
1270 /* In case we are C_CONNECTED postpone any decision on the new disk
1271 state after the negotiation phase. */
1272 if (mdev->state.conn == C_CONNECTED) {
1273 mdev->new_state_tmp.i = ns.i;
1274 ns.i = os.i;
1275 ns.disk = D_NEGOTIATING;
dc66c74d
PR
1276
1277 /* We expect to receive up-to-date UUIDs soon.
1278 To avoid a race in receive_state, free p_uuid while
1279 holding req_lock. I.e. atomic with the state change */
1280 kfree(mdev->p_uuid);
1281 mdev->p_uuid = NULL;
b411b363
PR
1282 }
1283
1284 rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
1285 ns = mdev->state;
87eeee41 1286 spin_unlock_irq(&mdev->tconn->req_lock);
b411b363
PR
1287
1288 if (rv < SS_SUCCESS)
1289 goto force_diskless_dec;
1290
1291 if (mdev->state.role == R_PRIMARY)
1292 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
1293 else
1294 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1295
1296 drbd_md_mark_dirty(mdev);
1297 drbd_md_sync(mdev);
1298
1299 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1300 put_ldev(mdev);
1301 reply->ret_code = retcode;
1302 drbd_reconfig_done(mdev);
1303 return 0;
1304
1305 force_diskless_dec:
1306 put_ldev(mdev);
1307 force_diskless:
82f59cc6 1308 drbd_force_state(mdev, NS(disk, D_FAILED));
b411b363 1309 drbd_md_sync(mdev);
b411b363
PR
1310 fail:
1311 if (nbc) {
e525fd89
TH
1312 if (nbc->backing_bdev)
1313 blkdev_put(nbc->backing_bdev,
1314 FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1315 if (nbc->md_bdev)
1316 blkdev_put(nbc->md_bdev,
1317 FMODE_READ | FMODE_WRITE | FMODE_EXCL);
b411b363
PR
1318 kfree(nbc);
1319 }
1320 lc_destroy(resync_lru);
1321
1322 reply->ret_code = retcode;
1323 drbd_reconfig_done(mdev);
1324 return 0;
1325}
1326
82f59cc6
LE
1327/* Detaching the disk is a process in multiple stages. First we need to lock
1328 * out application IO, in-flight IO, IO stuck in drbd_al_begin_io.
1329 * Then we transition to D_DISKLESS, and wait for put_ldev() to return all
1330 * internal references as well.
1331 * Only then we have finally detached. */
b411b363
PR
1332static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1333 struct drbd_nl_cfg_reply *reply)
1334{
9a0d9d03
LE
1335 enum drbd_ret_code retcode;
1336 int ret;
82f59cc6 1337 drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */
9a0d9d03
LE
1338 retcode = drbd_request_state(mdev, NS(disk, D_FAILED));
1339 /* D_FAILED will transition to DISKLESS. */
1340 ret = wait_event_interruptible(mdev->misc_wait,
1341 mdev->state.disk != D_FAILED);
82f59cc6 1342 drbd_resume_io(mdev);
9b2f61ae 1343 if ((int)retcode == (int)SS_IS_DISKLESS)
9a0d9d03
LE
1344 retcode = SS_NOTHING_TO_DO;
1345 if (ret)
1346 retcode = ERR_INTR;
1347 reply->ret_code = retcode;
b411b363
PR
1348 return 0;
1349}
1350
1351static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1352 struct drbd_nl_cfg_reply *reply)
1353{
bb3bfe96 1354 int i;
116676ca 1355 enum drbd_ret_code retcode;
b411b363
PR
1356 struct net_conf *new_conf = NULL;
1357 struct crypto_hash *tfm = NULL;
1358 struct crypto_hash *integrity_w_tfm = NULL;
1359 struct crypto_hash *integrity_r_tfm = NULL;
b411b363
PR
1360 struct drbd_conf *odev;
1361 char hmac_name[CRYPTO_MAX_ALG_NAME];
1362 void *int_dig_out = NULL;
1363 void *int_dig_in = NULL;
1364 void *int_dig_vv = NULL;
1365 struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr;
1366
1367 drbd_reconfig_start(mdev);
1368
1369 if (mdev->state.conn > C_STANDALONE) {
1370 retcode = ERR_NET_CONFIGURED;
1371 goto fail;
1372 }
1373
1374 /* allocation not in the IO path, cqueue thread context */
2db4e42e 1375 new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
b411b363
PR
1376 if (!new_conf) {
1377 retcode = ERR_NOMEM;
1378 goto fail;
1379 }
1380
b411b363
PR
1381 new_conf->timeout = DRBD_TIMEOUT_DEF;
1382 new_conf->try_connect_int = DRBD_CONNECT_INT_DEF;
1383 new_conf->ping_int = DRBD_PING_INT_DEF;
1384 new_conf->max_epoch_size = DRBD_MAX_EPOCH_SIZE_DEF;
1385 new_conf->max_buffers = DRBD_MAX_BUFFERS_DEF;
1386 new_conf->unplug_watermark = DRBD_UNPLUG_WATERMARK_DEF;
1387 new_conf->sndbuf_size = DRBD_SNDBUF_SIZE_DEF;
1388 new_conf->rcvbuf_size = DRBD_RCVBUF_SIZE_DEF;
1389 new_conf->ko_count = DRBD_KO_COUNT_DEF;
1390 new_conf->after_sb_0p = DRBD_AFTER_SB_0P_DEF;
1391 new_conf->after_sb_1p = DRBD_AFTER_SB_1P_DEF;
1392 new_conf->after_sb_2p = DRBD_AFTER_SB_2P_DEF;
1393 new_conf->want_lose = 0;
1394 new_conf->two_primaries = 0;
1395 new_conf->wire_protocol = DRBD_PROT_C;
1396 new_conf->ping_timeo = DRBD_PING_TIMEO_DEF;
1397 new_conf->rr_conflict = DRBD_RR_CONFLICT_DEF;
422028b1
PR
1398 new_conf->on_congestion = DRBD_ON_CONGESTION_DEF;
1399 new_conf->cong_extents = DRBD_CONG_EXTENTS_DEF;
b411b363
PR
1400
1401 if (!net_conf_from_tags(mdev, nlp->tag_list, new_conf)) {
1402 retcode = ERR_MANDATORY_TAG;
1403 goto fail;
1404 }
1405
1406 if (new_conf->two_primaries
1407 && (new_conf->wire_protocol != DRBD_PROT_C)) {
1408 retcode = ERR_NOT_PROTO_C;
1409 goto fail;
47ff2d0a
PR
1410 }
1411
1412 if (get_ldev(mdev)) {
1413 enum drbd_fencing_p fp = mdev->ldev->dc.fencing;
1414 put_ldev(mdev);
1415 if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH) {
1416 retcode = ERR_STONITH_AND_PROT_A;
1417 goto fail;
1418 }
1419 }
b411b363 1420
422028b1
PR
1421 if (new_conf->on_congestion != OC_BLOCK && new_conf->wire_protocol != DRBD_PROT_A) {
1422 retcode = ERR_CONG_NOT_PROTO_A;
1423 goto fail;
1424 }
1425
b411b363
PR
1426 if (mdev->state.role == R_PRIMARY && new_conf->want_lose) {
1427 retcode = ERR_DISCARD;
1428 goto fail;
1429 }
1430
1431 retcode = NO_ERROR;
1432
1433 new_my_addr = (struct sockaddr *)&new_conf->my_addr;
1434 new_peer_addr = (struct sockaddr *)&new_conf->peer_addr;
1435 for (i = 0; i < minor_count; i++) {
1436 odev = minor_to_mdev(i);
1437 if (!odev || odev == mdev)
1438 continue;
b2fb6dbe 1439 if (get_net_conf(odev->tconn)) {
89e58e75
PR
1440 taken_addr = (struct sockaddr *)&odev->tconn->net_conf->my_addr;
1441 if (new_conf->my_addr_len == odev->tconn->net_conf->my_addr_len &&
b411b363
PR
1442 !memcmp(new_my_addr, taken_addr, new_conf->my_addr_len))
1443 retcode = ERR_LOCAL_ADDR;
1444
89e58e75
PR
1445 taken_addr = (struct sockaddr *)&odev->tconn->net_conf->peer_addr;
1446 if (new_conf->peer_addr_len == odev->tconn->net_conf->peer_addr_len &&
b411b363
PR
1447 !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len))
1448 retcode = ERR_PEER_ADDR;
1449
b2fb6dbe 1450 put_net_conf(odev->tconn);
b411b363
PR
1451 if (retcode != NO_ERROR)
1452 goto fail;
1453 }
1454 }
1455
1456 if (new_conf->cram_hmac_alg[0] != 0) {
1457 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
1458 new_conf->cram_hmac_alg);
1459 tfm = crypto_alloc_hash(hmac_name, 0, CRYPTO_ALG_ASYNC);
1460 if (IS_ERR(tfm)) {
1461 tfm = NULL;
1462 retcode = ERR_AUTH_ALG;
1463 goto fail;
1464 }
1465
0798219f 1466 if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) {
b411b363
PR
1467 retcode = ERR_AUTH_ALG_ND;
1468 goto fail;
1469 }
1470 }
1471
1472 if (new_conf->integrity_alg[0]) {
1473 integrity_w_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1474 if (IS_ERR(integrity_w_tfm)) {
1475 integrity_w_tfm = NULL;
1476 retcode=ERR_INTEGRITY_ALG;
1477 goto fail;
1478 }
1479
1480 if (!drbd_crypto_is_hash(crypto_hash_tfm(integrity_w_tfm))) {
1481 retcode=ERR_INTEGRITY_ALG_ND;
1482 goto fail;
1483 }
1484
1485 integrity_r_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1486 if (IS_ERR(integrity_r_tfm)) {
1487 integrity_r_tfm = NULL;
1488 retcode=ERR_INTEGRITY_ALG;
1489 goto fail;
1490 }
1491 }
1492
b411b363
PR
1493 ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
1494
1495 if (integrity_w_tfm) {
1496 i = crypto_hash_digestsize(integrity_w_tfm);
1497 int_dig_out = kmalloc(i, GFP_KERNEL);
1498 if (!int_dig_out) {
1499 retcode = ERR_NOMEM;
1500 goto fail;
1501 }
1502 int_dig_in = kmalloc(i, GFP_KERNEL);
1503 if (!int_dig_in) {
1504 retcode = ERR_NOMEM;
1505 goto fail;
1506 }
1507 int_dig_vv = kmalloc(i, GFP_KERNEL);
1508 if (!int_dig_vv) {
1509 retcode = ERR_NOMEM;
1510 goto fail;
1511 }
1512 }
1513
1514 if (!mdev->bitmap) {
1515 if(drbd_bm_init(mdev)) {
1516 retcode = ERR_NOMEM;
1517 goto fail;
1518 }
1519 }
1520
a21e9298 1521 drbd_flush_workqueue(mdev);
87eeee41 1522 spin_lock_irq(&mdev->tconn->req_lock);
89e58e75 1523 if (mdev->tconn->net_conf != NULL) {
b411b363 1524 retcode = ERR_NET_CONFIGURED;
87eeee41 1525 spin_unlock_irq(&mdev->tconn->req_lock);
b411b363
PR
1526 goto fail;
1527 }
89e58e75 1528 mdev->tconn->net_conf = new_conf;
b411b363
PR
1529
1530 mdev->send_cnt = 0;
1531 mdev->recv_cnt = 0;
1532
a0638456
PR
1533 crypto_free_hash(mdev->tconn->cram_hmac_tfm);
1534 mdev->tconn->cram_hmac_tfm = tfm;
b411b363 1535
a0638456
PR
1536 crypto_free_hash(mdev->tconn->integrity_w_tfm);
1537 mdev->tconn->integrity_w_tfm = integrity_w_tfm;
b411b363 1538
a0638456
PR
1539 crypto_free_hash(mdev->tconn->integrity_r_tfm);
1540 mdev->tconn->integrity_r_tfm = integrity_r_tfm;
b411b363 1541
a0638456
PR
1542 kfree(mdev->tconn->int_dig_out);
1543 kfree(mdev->tconn->int_dig_in);
1544 kfree(mdev->tconn->int_dig_vv);
1545 mdev->tconn->int_dig_out=int_dig_out;
1546 mdev->tconn->int_dig_in=int_dig_in;
1547 mdev->tconn->int_dig_vv=int_dig_vv;
bbeb641c 1548 retcode = _conn_request_state(mdev->tconn, NS(conn, C_UNCONNECTED), CS_VERBOSE);
87eeee41 1549 spin_unlock_irq(&mdev->tconn->req_lock);
b411b363 1550
b411b363
PR
1551 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1552 reply->ret_code = retcode;
1553 drbd_reconfig_done(mdev);
1554 return 0;
1555
1556fail:
1557 kfree(int_dig_out);
1558 kfree(int_dig_in);
1559 kfree(int_dig_vv);
1560 crypto_free_hash(tfm);
1561 crypto_free_hash(integrity_w_tfm);
1562 crypto_free_hash(integrity_r_tfm);
b411b363
PR
1563 kfree(new_conf);
1564
1565 reply->ret_code = retcode;
1566 drbd_reconfig_done(mdev);
1567 return 0;
1568}
1569
1570static int drbd_nl_disconnect(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1571 struct drbd_nl_cfg_reply *reply)
1572{
df24aa45 1573 struct drbd_tconn *tconn = mdev->tconn;
b411b363 1574 int retcode;
2561b9c1
PR
1575 struct disconnect dc;
1576
1577 memset(&dc, 0, sizeof(struct disconnect));
1578 if (!disconnect_from_tags(mdev, nlp->tag_list, &dc)) {
1579 retcode = ERR_MANDATORY_TAG;
1580 goto fail;
1581 }
1582
1583 if (dc.force) {
df24aa45
PR
1584 spin_lock_irq(&tconn->req_lock);
1585 if (tconn->cstate >= C_WF_CONNECTION)
1586 _conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD);
1587 spin_unlock_irq(&tconn->req_lock);
2561b9c1
PR
1588 goto done;
1589 }
b411b363 1590
df24aa45 1591 retcode = conn_request_state(tconn, NS(conn, C_DISCONNECTING), 0);
b411b363
PR
1592
1593 if (retcode == SS_NOTHING_TO_DO)
1594 goto done;
1595 else if (retcode == SS_ALREADY_STANDALONE)
1596 goto done;
1597 else if (retcode == SS_PRIMARY_NOP) {
df24aa45
PR
1598 /* Our state checking code wants to see the peer outdated. */
1599 retcode = conn_request_state(tconn, NS2(conn, C_DISCONNECTING,
1600 pdsk, D_OUTDATED), CS_VERBOSE);
b411b363
PR
1601 } else if (retcode == SS_CW_FAILED_BY_PEER) {
1602 /* The peer probably wants to see us outdated. */
df24aa45
PR
1603 retcode = conn_request_state(tconn, NS2(conn, C_DISCONNECTING,
1604 disk, D_OUTDATED), 0);
b411b363 1605 if (retcode == SS_IS_DISKLESS || retcode == SS_LOWER_THAN_OUTDATED) {
df24aa45 1606 conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD);
b411b363
PR
1607 retcode = SS_SUCCESS;
1608 }
1609 }
1610
1611 if (retcode < SS_SUCCESS)
1612 goto fail;
1613
df24aa45
PR
1614 if (wait_event_interruptible(tconn->ping_wait,
1615 tconn->cstate != C_DISCONNECTING)) {
b411b363
PR
1616 /* Do not test for mdev->state.conn == C_STANDALONE, since
1617 someone else might connect us in the mean time! */
1618 retcode = ERR_INTR;
1619 goto fail;
1620 }
1621
1622 done:
1623 retcode = NO_ERROR;
1624 fail:
1625 drbd_md_sync(mdev);
1626 reply->ret_code = retcode;
1627 return 0;
1628}
1629
1630void resync_after_online_grow(struct drbd_conf *mdev)
1631{
1632 int iass; /* I am sync source */
1633
1634 dev_info(DEV, "Resync of new storage after online grow\n");
1635 if (mdev->state.role != mdev->state.peer)
1636 iass = (mdev->state.role == R_PRIMARY);
1637 else
25703f83 1638 iass = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags);
b411b363
PR
1639
1640 if (iass)
1641 drbd_start_resync(mdev, C_SYNC_SOURCE);
1642 else
1643 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
1644}
1645
1646static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1647 struct drbd_nl_cfg_reply *reply)
1648{
1649 struct resize rs;
1650 int retcode = NO_ERROR;
b411b363 1651 enum determine_dev_size dd;
6495d2c6 1652 enum dds_flags ddsf;
b411b363
PR
1653
1654 memset(&rs, 0, sizeof(struct resize));
1655 if (!resize_from_tags(mdev, nlp->tag_list, &rs)) {
1656 retcode = ERR_MANDATORY_TAG;
1657 goto fail;
1658 }
1659
1660 if (mdev->state.conn > C_CONNECTED) {
1661 retcode = ERR_RESIZE_RESYNC;
1662 goto fail;
1663 }
1664
1665 if (mdev->state.role == R_SECONDARY &&
1666 mdev->state.peer == R_SECONDARY) {
1667 retcode = ERR_NO_PRIMARY;
1668 goto fail;
1669 }
1670
1671 if (!get_ldev(mdev)) {
1672 retcode = ERR_NO_DISK;
1673 goto fail;
1674 }
1675
31890f4a 1676 if (rs.no_resync && mdev->tconn->agreed_pro_version < 93) {
6495d2c6
PR
1677 retcode = ERR_NEED_APV_93;
1678 goto fail;
1679 }
1680
087c2492 1681 if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev))
b411b363 1682 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
b411b363
PR
1683
1684 mdev->ldev->dc.disk_size = (sector_t)rs.resize_size;
6495d2c6 1685 ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
24c4830c 1686 dd = drbd_determine_dev_size(mdev, ddsf);
b411b363
PR
1687 drbd_md_sync(mdev);
1688 put_ldev(mdev);
1689 if (dd == dev_size_error) {
1690 retcode = ERR_NOMEM_BITMAP;
1691 goto fail;
1692 }
1693
087c2492 1694 if (mdev->state.conn == C_CONNECTED) {
b411b363
PR
1695 if (dd == grew)
1696 set_bit(RESIZE_PENDING, &mdev->flags);
1697
1698 drbd_send_uuids(mdev);
6495d2c6 1699 drbd_send_sizes(mdev, 1, ddsf);
b411b363
PR
1700 }
1701
1702 fail:
1703 reply->ret_code = retcode;
1704 return 0;
1705}
1706
1707static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1708 struct drbd_nl_cfg_reply *reply)
1709{
1710 int retcode = NO_ERROR;
1711 int err;
1712 int ovr; /* online verify running */
1713 int rsr; /* re-sync running */
1714 struct crypto_hash *verify_tfm = NULL;
1715 struct crypto_hash *csums_tfm = NULL;
1716 struct syncer_conf sc;
1717 cpumask_var_t new_cpu_mask;
778f271d
PR
1718 int *rs_plan_s = NULL;
1719 int fifo_size;
b411b363
PR
1720
1721 if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) {
1722 retcode = ERR_NOMEM;
1723 goto fail;
1724 }
1725
1726 if (nlp->flags & DRBD_NL_SET_DEFAULTS) {
1727 memset(&sc, 0, sizeof(struct syncer_conf));
1728 sc.rate = DRBD_RATE_DEF;
1729 sc.after = DRBD_AFTER_DEF;
1730 sc.al_extents = DRBD_AL_EXTENTS_DEF;
265be2d0 1731 sc.on_no_data = DRBD_ON_NO_DATA_DEF;
9a31d716
PR
1732 sc.c_plan_ahead = DRBD_C_PLAN_AHEAD_DEF;
1733 sc.c_delay_target = DRBD_C_DELAY_TARGET_DEF;
1734 sc.c_fill_target = DRBD_C_FILL_TARGET_DEF;
0f0601f4
LE
1735 sc.c_max_rate = DRBD_C_MAX_RATE_DEF;
1736 sc.c_min_rate = DRBD_C_MIN_RATE_DEF;
b411b363
PR
1737 } else
1738 memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf));
1739
1740 if (!syncer_conf_from_tags(mdev, nlp->tag_list, &sc)) {
1741 retcode = ERR_MANDATORY_TAG;
1742 goto fail;
1743 }
1744
1745 /* re-sync running */
1746 rsr = ( mdev->state.conn == C_SYNC_SOURCE ||
1747 mdev->state.conn == C_SYNC_TARGET ||
1748 mdev->state.conn == C_PAUSED_SYNC_S ||
1749 mdev->state.conn == C_PAUSED_SYNC_T );
1750
1751 if (rsr && strcmp(sc.csums_alg, mdev->sync_conf.csums_alg)) {
1752 retcode = ERR_CSUMS_RESYNC_RUNNING;
1753 goto fail;
1754 }
1755
1756 if (!rsr && sc.csums_alg[0]) {
1757 csums_tfm = crypto_alloc_hash(sc.csums_alg, 0, CRYPTO_ALG_ASYNC);
1758 if (IS_ERR(csums_tfm)) {
1759 csums_tfm = NULL;
1760 retcode = ERR_CSUMS_ALG;
1761 goto fail;
1762 }
1763
1764 if (!drbd_crypto_is_hash(crypto_hash_tfm(csums_tfm))) {
1765 retcode = ERR_CSUMS_ALG_ND;
1766 goto fail;
1767 }
1768 }
1769
1770 /* online verify running */
1771 ovr = (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T);
1772
1773 if (ovr) {
1774 if (strcmp(sc.verify_alg, mdev->sync_conf.verify_alg)) {
1775 retcode = ERR_VERIFY_RUNNING;
1776 goto fail;
1777 }
1778 }
1779
1780 if (!ovr && sc.verify_alg[0]) {
1781 verify_tfm = crypto_alloc_hash(sc.verify_alg, 0, CRYPTO_ALG_ASYNC);
1782 if (IS_ERR(verify_tfm)) {
1783 verify_tfm = NULL;
1784 retcode = ERR_VERIFY_ALG;
1785 goto fail;
1786 }
1787
1788 if (!drbd_crypto_is_hash(crypto_hash_tfm(verify_tfm))) {
1789 retcode = ERR_VERIFY_ALG_ND;
1790 goto fail;
1791 }
1792 }
1793
1794 /* silently ignore cpu mask on UP kernel */
1795 if (nr_cpu_ids > 1 && sc.cpu_mask[0] != 0) {
1796 err = __bitmap_parse(sc.cpu_mask, 32, 0,
1797 cpumask_bits(new_cpu_mask), nr_cpu_ids);
1798 if (err) {
1799 dev_warn(DEV, "__bitmap_parse() failed with %d\n", err);
1800 retcode = ERR_CPU_MASK_PARSE;
1801 goto fail;
1802 }
1803 }
1804
841ce241
AG
1805 if (!expect(sc.rate >= 1))
1806 sc.rate = 1;
1807 if (!expect(sc.al_extents >= 7))
1808 sc.al_extents = 127; /* arbitrary minimum */
b411b363
PR
1809#define AL_MAX ((MD_AL_MAX_SIZE-1) * AL_EXTENTS_PT)
1810 if (sc.al_extents > AL_MAX) {
1811 dev_err(DEV, "sc.al_extents > %d\n", AL_MAX);
1812 sc.al_extents = AL_MAX;
1813 }
1814#undef AL_MAX
1815
ef50a3e3
LE
1816 /* to avoid spurious errors when configuring minors before configuring
1817 * the minors they depend on: if necessary, first create the minor we
1818 * depend on */
1819 if (sc.after >= 0)
1820 ensure_mdev(sc.after, 1);
1821
b411b363
PR
1822 /* most sanity checks done, try to assign the new sync-after
1823 * dependency. need to hold the global lock in there,
1824 * to avoid a race in the dependency loop check. */
1825 retcode = drbd_alter_sa(mdev, sc.after);
1826 if (retcode != NO_ERROR)
1827 goto fail;
1828
778f271d
PR
1829 fifo_size = (sc.c_plan_ahead * 10 * SLEEP_TIME) / HZ;
1830 if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) {
1831 rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL);
1832 if (!rs_plan_s) {
1833 dev_err(DEV, "kmalloc of fifo_buffer failed");
1834 retcode = ERR_NOMEM;
1835 goto fail;
1836 }
1837 }
1838
b411b363
PR
1839 /* ok, assign the rest of it as well.
1840 * lock against receive_SyncParam() */
1841 spin_lock(&mdev->peer_seq_lock);
1842 mdev->sync_conf = sc;
1843
1844 if (!rsr) {
1845 crypto_free_hash(mdev->csums_tfm);
1846 mdev->csums_tfm = csums_tfm;
1847 csums_tfm = NULL;
1848 }
1849
1850 if (!ovr) {
1851 crypto_free_hash(mdev->verify_tfm);
1852 mdev->verify_tfm = verify_tfm;
1853 verify_tfm = NULL;
1854 }
778f271d
PR
1855
1856 if (fifo_size != mdev->rs_plan_s.size) {
1857 kfree(mdev->rs_plan_s.values);
1858 mdev->rs_plan_s.values = rs_plan_s;
1859 mdev->rs_plan_s.size = fifo_size;
1860 mdev->rs_planed = 0;
1861 rs_plan_s = NULL;
1862 }
1863
b411b363
PR
1864 spin_unlock(&mdev->peer_seq_lock);
1865
1866 if (get_ldev(mdev)) {
1867 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
1868 drbd_al_shrink(mdev);
1869 err = drbd_check_al_size(mdev);
1870 lc_unlock(mdev->act_log);
1871 wake_up(&mdev->al_wait);
1872
1873 put_ldev(mdev);
1874 drbd_md_sync(mdev);
1875
1876 if (err) {
1877 retcode = ERR_NOMEM;
1878 goto fail;
1879 }
1880 }
1881
1882 if (mdev->state.conn >= C_CONNECTED)
1883 drbd_send_sync_param(mdev, &sc);
1884
80822284
PR
1885 if (!cpumask_equal(mdev->tconn->cpu_mask, new_cpu_mask)) {
1886 cpumask_copy(mdev->tconn->cpu_mask, new_cpu_mask);
1887 drbd_calc_cpu_mask(mdev->tconn);
e6b3ea83
PR
1888 mdev->tconn->receiver.reset_cpu_mask = 1;
1889 mdev->tconn->asender.reset_cpu_mask = 1;
1890 mdev->tconn->worker.reset_cpu_mask = 1;
b411b363
PR
1891 }
1892
1893 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1894fail:
778f271d 1895 kfree(rs_plan_s);
b411b363
PR
1896 free_cpumask_var(new_cpu_mask);
1897 crypto_free_hash(csums_tfm);
1898 crypto_free_hash(verify_tfm);
1899 reply->ret_code = retcode;
1900 return 0;
1901}
1902
1903static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1904 struct drbd_nl_cfg_reply *reply)
1905{
1906 int retcode;
1907
194bfb32
LE
1908 /* If there is still bitmap IO pending, probably because of a previous
1909 * resync just being finished, wait for it before requesting a new resync. */
1910 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
1911
b411b363
PR
1912 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
1913
1914 if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
1915 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1916
1917 while (retcode == SS_NEED_CONNECTION) {
87eeee41 1918 spin_lock_irq(&mdev->tconn->req_lock);
b411b363
PR
1919 if (mdev->state.conn < C_CONNECTED)
1920 retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL);
87eeee41 1921 spin_unlock_irq(&mdev->tconn->req_lock);
b411b363
PR
1922
1923 if (retcode != SS_NEED_CONNECTION)
1924 break;
1925
1926 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1927 }
1928
1929 reply->ret_code = retcode;
1930 return 0;
1931}
1932
0778286a
PR
1933static int drbd_bmio_set_susp_al(struct drbd_conf *mdev)
1934{
1935 int rv;
1936
1937 rv = drbd_bmio_set_n_write(mdev);
1938 drbd_suspend_al(mdev);
1939 return rv;
1940}
1941
b411b363
PR
1942static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1943 struct drbd_nl_cfg_reply *reply)
1944{
0778286a 1945 int retcode;
b411b363 1946
194bfb32
LE
1947 /* If there is still bitmap IO pending, probably because of a previous
1948 * resync just being finished, wait for it before requesting a new resync. */
1949 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
1950
0778286a
PR
1951 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED);
1952
1953 if (retcode < SS_SUCCESS) {
1954 if (retcode == SS_NEED_CONNECTION && mdev->state.role == R_PRIMARY) {
1955 /* The peer will get a resync upon connect anyways. Just make that
1956 into a full resync. */
1957 retcode = drbd_request_state(mdev, NS(pdsk, D_INCONSISTENT));
1958 if (retcode >= SS_SUCCESS) {
0778286a 1959 if (drbd_bitmap_io(mdev, &drbd_bmio_set_susp_al,
20ceb2b2
LE
1960 "set_n_write from invalidate_peer",
1961 BM_LOCKED_SET_ALLOWED))
0778286a
PR
1962 retcode = ERR_IO_MD_DISK;
1963 }
1964 } else
1965 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
1966 }
b411b363 1967
0778286a 1968 reply->ret_code = retcode;
b411b363
PR
1969 return 0;
1970}
1971
1972static int drbd_nl_pause_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1973 struct drbd_nl_cfg_reply *reply)
1974{
1975 int retcode = NO_ERROR;
1976
1977 if (drbd_request_state(mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
1978 retcode = ERR_PAUSE_IS_SET;
1979
1980 reply->ret_code = retcode;
1981 return 0;
1982}
1983
1984static int drbd_nl_resume_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1985 struct drbd_nl_cfg_reply *reply)
1986{
1987 int retcode = NO_ERROR;
cd88d030 1988 union drbd_state s;
b411b363 1989
cd88d030
PR
1990 if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO) {
1991 s = mdev->state;
1992 if (s.conn == C_PAUSED_SYNC_S || s.conn == C_PAUSED_SYNC_T) {
1993 retcode = s.aftr_isp ? ERR_PIC_AFTER_DEP :
1994 s.peer_isp ? ERR_PIC_PEER_DEP : ERR_PAUSE_IS_CLEAR;
1995 } else {
1996 retcode = ERR_PAUSE_IS_CLEAR;
1997 }
1998 }
b411b363
PR
1999
2000 reply->ret_code = retcode;
2001 return 0;
2002}
2003
2004static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2005 struct drbd_nl_cfg_reply *reply)
2006{
2007 reply->ret_code = drbd_request_state(mdev, NS(susp, 1));
2008
2009 return 0;
2010}
2011
2012static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2013 struct drbd_nl_cfg_reply *reply)
2014{
43a5182c
PR
2015 if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
2016 drbd_uuid_new_current(mdev);
2017 clear_bit(NEW_CUR_UUID, &mdev->flags);
43a5182c 2018 }
265be2d0 2019 drbd_suspend_io(mdev);
fb22c402 2020 reply->ret_code = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0));
265be2d0
PR
2021 if (reply->ret_code == SS_SUCCESS) {
2022 if (mdev->state.conn < C_CONNECTED)
2023 tl_clear(mdev);
2024 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED)
8554df1c 2025 tl_restart(mdev, FAIL_FROZEN_DISK_IO);
265be2d0
PR
2026 }
2027 drbd_resume_io(mdev);
2028
b411b363
PR
2029 return 0;
2030}
2031
2032static int drbd_nl_outdate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2033 struct drbd_nl_cfg_reply *reply)
2034{
2035 reply->ret_code = drbd_request_state(mdev, NS(disk, D_OUTDATED));
2036 return 0;
2037}
2038
2039static int drbd_nl_get_config(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2040 struct drbd_nl_cfg_reply *reply)
2041{
2042 unsigned short *tl;
2043
2044 tl = reply->tag_list;
2045
2046 if (get_ldev(mdev)) {
2047 tl = disk_conf_to_tags(mdev, &mdev->ldev->dc, tl);
2048 put_ldev(mdev);
2049 }
2050
b2fb6dbe 2051 if (get_net_conf(mdev->tconn)) {
89e58e75 2052 tl = net_conf_to_tags(mdev, mdev->tconn->net_conf, tl);
b2fb6dbe 2053 put_net_conf(mdev->tconn);
b411b363
PR
2054 }
2055 tl = syncer_conf_to_tags(mdev, &mdev->sync_conf, tl);
2056
2057 put_unaligned(TT_END, tl++); /* Close the tag list */
2058
2059 return (int)((char *)tl - (char *)reply->tag_list);
2060}
2061
2062static int drbd_nl_get_state(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2063 struct drbd_nl_cfg_reply *reply)
2064{
2065 unsigned short *tl = reply->tag_list;
2066 union drbd_state s = mdev->state;
2067 unsigned long rs_left;
2068 unsigned int res;
2069
2070 tl = get_state_to_tags(mdev, (struct get_state *)&s, tl);
2071
2072 /* no local ref, no bitmap, no syncer progress. */
2073 if (s.conn >= C_SYNC_SOURCE && s.conn <= C_PAUSED_SYNC_T) {
2074 if (get_ldev(mdev)) {
2075 drbd_get_syncer_progress(mdev, &rs_left, &res);
2076 tl = tl_add_int(tl, T_sync_progress, &res);
2077 put_ldev(mdev);
2078 }
2079 }
2080 put_unaligned(TT_END, tl++); /* Close the tag list */
2081
2082 return (int)((char *)tl - (char *)reply->tag_list);
2083}
2084
2085static int drbd_nl_get_uuids(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2086 struct drbd_nl_cfg_reply *reply)
2087{
2088 unsigned short *tl;
2089
2090 tl = reply->tag_list;
2091
2092 if (get_ldev(mdev)) {
2093 tl = tl_add_blob(tl, T_uuids, mdev->ldev->md.uuid, UI_SIZE*sizeof(u64));
2094 tl = tl_add_int(tl, T_uuids_flags, &mdev->ldev->md.flags);
2095 put_ldev(mdev);
2096 }
2097 put_unaligned(TT_END, tl++); /* Close the tag list */
2098
2099 return (int)((char *)tl - (char *)reply->tag_list);
2100}
2101
2102/**
2103 * drbd_nl_get_timeout_flag() - Used by drbdsetup to find out which timeout value to use
2104 * @mdev: DRBD device.
2105 * @nlp: Netlink/connector packet from drbdsetup
2106 * @reply: Reply packet for drbdsetup
2107 */
2108static int drbd_nl_get_timeout_flag(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2109 struct drbd_nl_cfg_reply *reply)
2110{
2111 unsigned short *tl;
2112 char rv;
2113
2114 tl = reply->tag_list;
2115
2116 rv = mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
2117 test_bit(USE_DEGR_WFC_T, &mdev->flags) ? UT_DEGRADED : UT_DEFAULT;
2118
2119 tl = tl_add_blob(tl, T_use_degraded, &rv, sizeof(rv));
2120 put_unaligned(TT_END, tl++); /* Close the tag list */
2121
2122 return (int)((char *)tl - (char *)reply->tag_list);
2123}
2124
2125static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2126 struct drbd_nl_cfg_reply *reply)
2127{
2128 /* default to resume from last known position, if possible */
2129 struct start_ov args =
2130 { .start_sector = mdev->ov_start_sector };
2131
2132 if (!start_ov_from_tags(mdev, nlp->tag_list, &args)) {
2133 reply->ret_code = ERR_MANDATORY_TAG;
2134 return 0;
2135 }
873b0d5f
LE
2136
2137 /* If there is still bitmap IO pending, e.g. previous resync or verify
2138 * just being finished, wait for it before requesting a new resync. */
2139 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2140
b411b363
PR
2141 /* w_make_ov_request expects position to be aligned */
2142 mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT;
2143 reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
2144 return 0;
2145}
2146
2147
2148static int drbd_nl_new_c_uuid(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2149 struct drbd_nl_cfg_reply *reply)
2150{
2151 int retcode = NO_ERROR;
2152 int skip_initial_sync = 0;
2153 int err;
2154
2155 struct new_c_uuid args;
2156
2157 memset(&args, 0, sizeof(struct new_c_uuid));
2158 if (!new_c_uuid_from_tags(mdev, nlp->tag_list, &args)) {
2159 reply->ret_code = ERR_MANDATORY_TAG;
2160 return 0;
2161 }
2162
8410da8f 2163 mutex_lock(mdev->state_mutex); /* Protects us against serialized state changes. */
b411b363
PR
2164
2165 if (!get_ldev(mdev)) {
2166 retcode = ERR_NO_DISK;
2167 goto out;
2168 }
2169
2170 /* this is "skip initial sync", assume to be clean */
31890f4a 2171 if (mdev->state.conn == C_CONNECTED && mdev->tconn->agreed_pro_version >= 90 &&
b411b363
PR
2172 mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
2173 dev_info(DEV, "Preparing to skip initial sync\n");
2174 skip_initial_sync = 1;
2175 } else if (mdev->state.conn != C_STANDALONE) {
2176 retcode = ERR_CONNECTED;
2177 goto out_dec;
2178 }
2179
2180 drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
2181 drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
2182
2183 if (args.clear_bm) {
20ceb2b2
LE
2184 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write,
2185 "clear_n_write from new_c_uuid", BM_LOCKED_MASK);
b411b363
PR
2186 if (err) {
2187 dev_err(DEV, "Writing bitmap failed with %d\n",err);
2188 retcode = ERR_IO_MD_DISK;
2189 }
2190 if (skip_initial_sync) {
2191 drbd_send_uuids_skip_initial_sync(mdev);
2192 _drbd_uuid_set(mdev, UI_BITMAP, 0);
62b0da3a 2193 drbd_print_uuids(mdev, "cleared bitmap UUID");
87eeee41 2194 spin_lock_irq(&mdev->tconn->req_lock);
b411b363
PR
2195 _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
2196 CS_VERBOSE, NULL);
87eeee41 2197 spin_unlock_irq(&mdev->tconn->req_lock);
b411b363
PR
2198 }
2199 }
2200
2201 drbd_md_sync(mdev);
2202out_dec:
2203 put_ldev(mdev);
2204out:
8410da8f 2205 mutex_unlock(mdev->state_mutex);
b411b363
PR
2206
2207 reply->ret_code = retcode;
2208 return 0;
2209}
2210
b411b363
PR
2211struct cn_handler_struct {
2212 int (*function)(struct drbd_conf *,
2213 struct drbd_nl_cfg_req *,
2214 struct drbd_nl_cfg_reply *);
2215 int reply_body_size;
2216};
2217
2218static struct cn_handler_struct cnd_table[] = {
2219 [ P_primary ] = { &drbd_nl_primary, 0 },
2220 [ P_secondary ] = { &drbd_nl_secondary, 0 },
2221 [ P_disk_conf ] = { &drbd_nl_disk_conf, 0 },
2222 [ P_detach ] = { &drbd_nl_detach, 0 },
2223 [ P_net_conf ] = { &drbd_nl_net_conf, 0 },
2224 [ P_disconnect ] = { &drbd_nl_disconnect, 0 },
2225 [ P_resize ] = { &drbd_nl_resize, 0 },
2226 [ P_syncer_conf ] = { &drbd_nl_syncer_conf, 0 },
2227 [ P_invalidate ] = { &drbd_nl_invalidate, 0 },
2228 [ P_invalidate_peer ] = { &drbd_nl_invalidate_peer, 0 },
2229 [ P_pause_sync ] = { &drbd_nl_pause_sync, 0 },
2230 [ P_resume_sync ] = { &drbd_nl_resume_sync, 0 },
2231 [ P_suspend_io ] = { &drbd_nl_suspend_io, 0 },
2232 [ P_resume_io ] = { &drbd_nl_resume_io, 0 },
2233 [ P_outdate ] = { &drbd_nl_outdate, 0 },
2234 [ P_get_config ] = { &drbd_nl_get_config,
2235 sizeof(struct syncer_conf_tag_len_struct) +
2236 sizeof(struct disk_conf_tag_len_struct) +
2237 sizeof(struct net_conf_tag_len_struct) },
2238 [ P_get_state ] = { &drbd_nl_get_state,
2239 sizeof(struct get_state_tag_len_struct) +
2240 sizeof(struct sync_progress_tag_len_struct) },
2241 [ P_get_uuids ] = { &drbd_nl_get_uuids,
2242 sizeof(struct get_uuids_tag_len_struct) },
2243 [ P_get_timeout_flag ] = { &drbd_nl_get_timeout_flag,
2244 sizeof(struct get_timeout_flag_tag_len_struct)},
2245 [ P_start_ov ] = { &drbd_nl_start_ov, 0 },
2246 [ P_new_c_uuid ] = { &drbd_nl_new_c_uuid, 0 },
2247};
2248
9f5180e5 2249static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp)
b411b363
PR
2250{
2251 struct drbd_nl_cfg_req *nlp = (struct drbd_nl_cfg_req *)req->data;
2252 struct cn_handler_struct *cm;
2253 struct cn_msg *cn_reply;
2254 struct drbd_nl_cfg_reply *reply;
2255 struct drbd_conf *mdev;
2256 int retcode, rr;
2257 int reply_size = sizeof(struct cn_msg)
2258 + sizeof(struct drbd_nl_cfg_reply)
2259 + sizeof(short int);
2260
2261 if (!try_module_get(THIS_MODULE)) {
2262 printk(KERN_ERR "drbd: try_module_get() failed!\n");
2263 return;
2264 }
2265
01a16b21 2266 if (!cap_raised(current_cap(), CAP_SYS_ADMIN)) {
9f5180e5
PR
2267 retcode = ERR_PERM;
2268 goto fail;
2269 }
2270
ef50a3e3
LE
2271 mdev = ensure_mdev(nlp->drbd_minor,
2272 (nlp->flags & DRBD_NL_CREATE_DEVICE));
b411b363
PR
2273 if (!mdev) {
2274 retcode = ERR_MINOR_INVALID;
2275 goto fail;
2276 }
2277
42ff269d
LE
2278 if (nlp->packet_type >= P_nl_after_last_packet ||
2279 nlp->packet_type == P_return_code_only) {
b411b363
PR
2280 retcode = ERR_PACKET_NR;
2281 goto fail;
2282 }
2283
2284 cm = cnd_table + nlp->packet_type;
2285
2286 /* This may happen if packet number is 0: */
2287 if (cm->function == NULL) {
2288 retcode = ERR_PACKET_NR;
2289 goto fail;
2290 }
2291
2292 reply_size += cm->reply_body_size;
2293
2294 /* allocation not in the IO path, cqueue thread context */
3e3a7766 2295 cn_reply = kzalloc(reply_size, GFP_KERNEL);
b411b363
PR
2296 if (!cn_reply) {
2297 retcode = ERR_NOMEM;
2298 goto fail;
2299 }
2300 reply = (struct drbd_nl_cfg_reply *) cn_reply->data;
2301
2302 reply->packet_type =
42ff269d 2303 cm->reply_body_size ? nlp->packet_type : P_return_code_only;
b411b363
PR
2304 reply->minor = nlp->drbd_minor;
2305 reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */
2306 /* reply->tag_list; might be modified by cm->function. */
2307
2308 rr = cm->function(mdev, nlp, reply);
2309
2310 cn_reply->id = req->id;
2311 cn_reply->seq = req->seq;
2312 cn_reply->ack = req->ack + 1;
2313 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + rr;
2314 cn_reply->flags = 0;
2315
b411b363
PR
2316 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL);
2317 if (rr && rr != -ESRCH)
2318 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2319
2320 kfree(cn_reply);
2321 module_put(THIS_MODULE);
2322 return;
2323 fail:
2324 drbd_nl_send_reply(req, retcode);
2325 module_put(THIS_MODULE);
2326}
2327
2328static atomic_t drbd_nl_seq = ATOMIC_INIT(2); /* two. */
2329
2330static unsigned short *
2331__tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data,
2332 unsigned short len, int nul_terminated)
2333{
2334 unsigned short l = tag_descriptions[tag_number(tag)].max_len;
2335 len = (len < l) ? len : l;
2336 put_unaligned(tag, tl++);
2337 put_unaligned(len, tl++);
2338 memcpy(tl, data, len);
2339 tl = (unsigned short*)((char*)tl + len);
2340 if (nul_terminated)
2341 *((char*)tl - 1) = 0;
2342 return tl;
2343}
2344
2345static unsigned short *
2346tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, int len)
2347{
2348 return __tl_add_blob(tl, tag, data, len, 0);
2349}
2350
2351static unsigned short *
2352tl_add_str(unsigned short *tl, enum drbd_tags tag, const char *str)
2353{
2354 return __tl_add_blob(tl, tag, str, strlen(str)+1, 0);
2355}
2356
2357static unsigned short *
2358tl_add_int(unsigned short *tl, enum drbd_tags tag, const void *val)
2359{
2360 put_unaligned(tag, tl++);
2361 switch(tag_type(tag)) {
2362 case TT_INTEGER:
2363 put_unaligned(sizeof(int), tl++);
2364 put_unaligned(*(int *)val, (int *)tl);
2365 tl = (unsigned short*)((char*)tl+sizeof(int));
2366 break;
2367 case TT_INT64:
2368 put_unaligned(sizeof(u64), tl++);
2369 put_unaligned(*(u64 *)val, (u64 *)tl);
2370 tl = (unsigned short*)((char*)tl+sizeof(u64));
2371 break;
2372 default:
2373 /* someone did something stupid. */
2374 ;
2375 }
2376 return tl;
2377}
2378
2379void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state state)
2380{
2381 char buffer[sizeof(struct cn_msg)+
2382 sizeof(struct drbd_nl_cfg_reply)+
2383 sizeof(struct get_state_tag_len_struct)+
2384 sizeof(short int)];
2385 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2386 struct drbd_nl_cfg_reply *reply =
2387 (struct drbd_nl_cfg_reply *)cn_reply->data;
2388 unsigned short *tl = reply->tag_list;
2389
2390 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2391
2392 tl = get_state_to_tags(mdev, (struct get_state *)&state, tl);
2393
2394 put_unaligned(TT_END, tl++); /* Close the tag list */
2395
2396 cn_reply->id.idx = CN_IDX_DRBD;
2397 cn_reply->id.val = CN_VAL_DRBD;
2398
2399 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2400 cn_reply->ack = 0; /* not used here. */
2401 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2402 (int)((char *)tl - (char *)reply->tag_list);
2403 cn_reply->flags = 0;
2404
2405 reply->packet_type = P_get_state;
2406 reply->minor = mdev_to_minor(mdev);
2407 reply->ret_code = NO_ERROR;
2408
b411b363
PR
2409 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2410}
2411
2412void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name)
2413{
2414 char buffer[sizeof(struct cn_msg)+
2415 sizeof(struct drbd_nl_cfg_reply)+
2416 sizeof(struct call_helper_tag_len_struct)+
2417 sizeof(short int)];
2418 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2419 struct drbd_nl_cfg_reply *reply =
2420 (struct drbd_nl_cfg_reply *)cn_reply->data;
2421 unsigned short *tl = reply->tag_list;
2422
2423 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2424
2425 tl = tl_add_str(tl, T_helper, helper_name);
2426 put_unaligned(TT_END, tl++); /* Close the tag list */
2427
2428 cn_reply->id.idx = CN_IDX_DRBD;
2429 cn_reply->id.val = CN_VAL_DRBD;
2430
2431 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2432 cn_reply->ack = 0; /* not used here. */
2433 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2434 (int)((char *)tl - (char *)reply->tag_list);
2435 cn_reply->flags = 0;
2436
2437 reply->packet_type = P_call_helper;
2438 reply->minor = mdev_to_minor(mdev);
2439 reply->ret_code = NO_ERROR;
2440
b411b363
PR
2441 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2442}
2443
f6ffca9f
AG
2444void drbd_bcast_ee(struct drbd_conf *mdev, const char *reason, const int dgs,
2445 const char *seen_hash, const char *calc_hash,
db830c46 2446 const struct drbd_peer_request *peer_req)
b411b363
PR
2447{
2448 struct cn_msg *cn_reply;
2449 struct drbd_nl_cfg_reply *reply;
b411b363 2450 unsigned short *tl;
45bb912b
LE
2451 struct page *page;
2452 unsigned len;
b411b363 2453
db830c46 2454 if (!peer_req)
b411b363
PR
2455 return;
2456 if (!reason || !reason[0])
2457 return;
2458
2459 /* apparently we have to memcpy twice, first to prepare the data for the
2460 * struct cn_msg, then within cn_netlink_send from the cn_msg to the
2461 * netlink skb. */
2462 /* receiver thread context, which is not in the writeout path (of this node),
2463 * but may be in the writeout path of the _other_ node.
2464 * GFP_NOIO to avoid potential "distributed deadlock". */
3e3a7766 2465 cn_reply = kzalloc(
b411b363
PR
2466 sizeof(struct cn_msg)+
2467 sizeof(struct drbd_nl_cfg_reply)+
2468 sizeof(struct dump_ee_tag_len_struct)+
2469 sizeof(short int),
2470 GFP_NOIO);
2471
2472 if (!cn_reply) {
db830c46
AG
2473 dev_err(DEV, "could not kmalloc buffer for drbd_bcast_ee, "
2474 "sector %llu, size %u\n",
2475 (unsigned long long)peer_req->i.sector,
2476 peer_req->i.size);
b411b363
PR
2477 return;
2478 }
2479
2480 reply = (struct drbd_nl_cfg_reply*)cn_reply->data;
2481 tl = reply->tag_list;
2482
2483 tl = tl_add_str(tl, T_dump_ee_reason, reason);
2484 tl = tl_add_blob(tl, T_seen_digest, seen_hash, dgs);
2485 tl = tl_add_blob(tl, T_calc_digest, calc_hash, dgs);
db830c46
AG
2486 tl = tl_add_int(tl, T_ee_sector, &peer_req->i.sector);
2487 tl = tl_add_int(tl, T_ee_block_id, &peer_req->block_id);
b411b363 2488
3129b1b9 2489 /* dump the first 32k */
db830c46 2490 len = min_t(unsigned, peer_req->i.size, 32 << 10);
b411b363 2491 put_unaligned(T_ee_data, tl++);
3129b1b9 2492 put_unaligned(len, tl++);
b411b363 2493
db830c46 2494 page = peer_req->pages;
45bb912b
LE
2495 page_chain_for_each(page) {
2496 void *d = kmap_atomic(page, KM_USER0);
2497 unsigned l = min_t(unsigned, len, PAGE_SIZE);
2498 memcpy(tl, d, l);
2499 kunmap_atomic(d, KM_USER0);
2500 tl = (unsigned short*)((char*)tl + l);
2501 len -= l;
3129b1b9
LE
2502 if (len == 0)
2503 break;
b411b363
PR
2504 }
2505 put_unaligned(TT_END, tl++); /* Close the tag list */
2506
2507 cn_reply->id.idx = CN_IDX_DRBD;
2508 cn_reply->id.val = CN_VAL_DRBD;
2509
2510 cn_reply->seq = atomic_add_return(1,&drbd_nl_seq);
2511 cn_reply->ack = 0; // not used here.
2512 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2513 (int)((char*)tl - (char*)reply->tag_list);
2514 cn_reply->flags = 0;
2515
2516 reply->packet_type = P_dump_ee;
2517 reply->minor = mdev_to_minor(mdev);
2518 reply->ret_code = NO_ERROR;
2519
b411b363
PR
2520 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2521 kfree(cn_reply);
2522}
2523
2524void drbd_bcast_sync_progress(struct drbd_conf *mdev)
2525{
2526 char buffer[sizeof(struct cn_msg)+
2527 sizeof(struct drbd_nl_cfg_reply)+
2528 sizeof(struct sync_progress_tag_len_struct)+
2529 sizeof(short int)];
2530 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2531 struct drbd_nl_cfg_reply *reply =
2532 (struct drbd_nl_cfg_reply *)cn_reply->data;
2533 unsigned short *tl = reply->tag_list;
2534 unsigned long rs_left;
2535 unsigned int res;
2536
2537 /* no local ref, no bitmap, no syncer progress, no broadcast. */
2538 if (!get_ldev(mdev))
2539 return;
2540 drbd_get_syncer_progress(mdev, &rs_left, &res);
2541 put_ldev(mdev);
2542
2543 tl = tl_add_int(tl, T_sync_progress, &res);
2544 put_unaligned(TT_END, tl++); /* Close the tag list */
2545
2546 cn_reply->id.idx = CN_IDX_DRBD;
2547 cn_reply->id.val = CN_VAL_DRBD;
2548
2549 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2550 cn_reply->ack = 0; /* not used here. */
2551 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2552 (int)((char *)tl - (char *)reply->tag_list);
2553 cn_reply->flags = 0;
2554
2555 reply->packet_type = P_sync_progress;
2556 reply->minor = mdev_to_minor(mdev);
2557 reply->ret_code = NO_ERROR;
2558
b411b363
PR
2559 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2560}
2561
2562int __init drbd_nl_init(void)
2563{
2564 static struct cb_id cn_id_drbd;
2565 int err, try=10;
2566
2567 cn_id_drbd.val = CN_VAL_DRBD;
2568 do {
2569 cn_id_drbd.idx = cn_idx;
2570 err = cn_add_callback(&cn_id_drbd, "cn_drbd", &drbd_connector_callback);
2571 if (!err)
2572 break;
2573 cn_idx = (cn_idx + CN_IDX_STEP);
2574 } while (try--);
2575
2576 if (err) {
2577 printk(KERN_ERR "drbd: cn_drbd failed to register\n");
2578 return err;
2579 }
2580
2581 return 0;
2582}
2583
2584void drbd_nl_cleanup(void)
2585{
2586 static struct cb_id cn_id_drbd;
2587
2588 cn_id_drbd.idx = cn_idx;
2589 cn_id_drbd.val = CN_VAL_DRBD;
2590
2591 cn_del_callback(&cn_id_drbd);
2592}
2593
2594void drbd_nl_send_reply(struct cn_msg *req, int ret_code)
2595{
2596 char buffer[sizeof(struct cn_msg)+sizeof(struct drbd_nl_cfg_reply)];
2597 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2598 struct drbd_nl_cfg_reply *reply =
2599 (struct drbd_nl_cfg_reply *)cn_reply->data;
2600 int rr;
2601
3e3a7766 2602 memset(buffer, 0, sizeof(buffer));
b411b363
PR
2603 cn_reply->id = req->id;
2604
2605 cn_reply->seq = req->seq;
2606 cn_reply->ack = req->ack + 1;
2607 cn_reply->len = sizeof(struct drbd_nl_cfg_reply);
2608 cn_reply->flags = 0;
2609
42ff269d 2610 reply->packet_type = P_return_code_only;
b411b363
PR
2611 reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor;
2612 reply->ret_code = ret_code;
2613
b411b363
PR
2614 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2615 if (rr && rr != -ESRCH)
2616 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2617}
2618
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