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drbd: Converted drbd_nl_(net_conf|disconnect)() from mdev to tconn
[mirror_ubuntu-artful-kernel.git] / drivers / block / drbd / drbd_nl.c
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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) \
3f9cbe93 53static int name ## _from_tags( \
b411b363 54 unsigned short *tags, struct name *arg) __attribute__ ((unused)); \
3f9cbe93 55static int name ## _from_tags( \
b411b363
PR
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) { \
3f9cbe93 67 printk(KERN_ERR "drbd: Unknown tag: %d\n", tag_number(tag)); \
b411b363
PR
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) { \
3f9cbe93 90 printk(KERN_ERR "drbd: arg too long: %s (%u wanted, max len: %u bytes)\n", \
b411b363
PR
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* \
3f9cbe93 102name ## _to_tags( \
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PR
103 struct name *arg, unsigned short *tags) __attribute__ ((unused)); \
104static unsigned short* \
3f9cbe93 105name ## _to_tags( \
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PR
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) {
b411b363
PR
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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PR
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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PR
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);
b411b363
PR
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);
b411b363
PR
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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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
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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
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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;
21423fa7 275 union drbd_state ns;
87f7be4c
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);
87f7be4c
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)
b411b363
PR
312{
313 const int max_tries = 4;
bf885f8a 314 enum drbd_state_rv rv = SS_UNKNOWN_ERROR;
b411b363
PR
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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PR
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);
b411b363
PR
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) {
b411b363
PR
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)) {
b411b363
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 &&
b411b363
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) {
b411b363
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}
b411b363
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));
3f9cbe93 486 if (!primary_from_tags(nlp->tag_list, &primary_args)) {
b411b363
PR
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);
b411b363
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 */
7ad651b5 530 bdev->md.al_offset = -MD_AL_SECTORS;
b411b363
PR
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
7ad651b5
LE
754 if (!expect(mdev->sync_conf.al_extents >= DRBD_AL_EXTENTS_MIN))
755 mdev->sync_conf.al_extents = DRBD_AL_EXTENTS_MIN;
b411b363
PR
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;
7ad651b5 763 n = lc_create("act_log", drbd_al_ext_cache, AL_UPDATES_PER_TRANSACTION,
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 873 */
0e29d163 874static void conn_reconfig_start(struct drbd_tconn *tconn)
b411b363 875{
0e29d163
PR
876 wait_event(tconn->ping_wait, !test_and_set_bit(CONFIG_PENDING, &tconn->flags));
877 wait_event(tconn->ping_wait, !test_bit(OBJECT_DYING, &tconn->flags));
878 drbd_thread_start(&tconn->worker);
879 conn_flush_workqueue(tconn);
b411b363
PR
880}
881
882/* if still unconfigured, stops worker again.
883 * if configured now, clears CONFIG_PENDING.
884 * wakes potential waiters */
0e29d163 885static void conn_reconfig_done(struct drbd_tconn *tconn)
b411b363 886{
0e29d163
PR
887 spin_lock_irq(&tconn->req_lock);
888 if (conn_all_vols_unconf(tconn)) {
889 set_bit(OBJECT_DYING, &tconn->flags);
890 drbd_thread_stop_nowait(&tconn->worker);
b411b363 891 } else
0e29d163
PR
892 clear_bit(CONFIG_PENDING, &tconn->flags);
893 spin_unlock_irq(&tconn->req_lock);
894 wake_up(&tconn->ping_wait);
b411b363
PR
895}
896
0778286a
PR
897/* Make sure IO is suspended before calling this function(). */
898static void drbd_suspend_al(struct drbd_conf *mdev)
899{
900 int s = 0;
901
61610420 902 if (!lc_try_lock(mdev->act_log)) {
0778286a
PR
903 dev_warn(DEV, "Failed to lock al in drbd_suspend_al()\n");
904 return;
905 }
906
61610420 907 drbd_al_shrink(mdev);
87eeee41 908 spin_lock_irq(&mdev->tconn->req_lock);
0778286a
PR
909 if (mdev->state.conn < C_CONNECTED)
910 s = !test_and_set_bit(AL_SUSPENDED, &mdev->flags);
87eeee41 911 spin_unlock_irq(&mdev->tconn->req_lock);
61610420 912 lc_unlock(mdev->act_log);
0778286a
PR
913
914 if (s)
915 dev_info(DEV, "Suspended AL updates\n");
916}
917
b411b363
PR
918/* does always return 0;
919 * interesting return code is in reply->ret_code */
920static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
921 struct drbd_nl_cfg_reply *reply)
922{
116676ca 923 enum drbd_ret_code retcode;
b411b363
PR
924 enum determine_dev_size dd;
925 sector_t max_possible_sectors;
926 sector_t min_md_device_sectors;
927 struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
e525fd89 928 struct block_device *bdev;
b411b363
PR
929 struct lru_cache *resync_lru = NULL;
930 union drbd_state ns, os;
f2024e7c 931 enum drbd_state_rv rv;
b411b363 932 int cp_discovered = 0;
b411b363 933
0e29d163 934 conn_reconfig_start(mdev->tconn);
b411b363
PR
935
936 /* if you want to reconfigure, please tear down first */
937 if (mdev->state.disk > D_DISKLESS) {
938 retcode = ERR_DISK_CONFIGURED;
939 goto fail;
940 }
82f59cc6
LE
941 /* It may just now have detached because of IO error. Make sure
942 * drbd_ldev_destroy is done already, we may end up here very fast,
943 * e.g. if someone calls attach from the on-io-error handler,
944 * to realize a "hot spare" feature (not that I'd recommend that) */
945 wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt));
b411b363
PR
946
947 /* allocation not in the IO path, cqueue thread context */
948 nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
949 if (!nbc) {
950 retcode = ERR_NOMEM;
951 goto fail;
952 }
953
954 nbc->dc.disk_size = DRBD_DISK_SIZE_SECT_DEF;
955 nbc->dc.on_io_error = DRBD_ON_IO_ERROR_DEF;
956 nbc->dc.fencing = DRBD_FENCING_DEF;
957 nbc->dc.max_bio_bvecs = DRBD_MAX_BIO_BVECS_DEF;
958
3f9cbe93 959 if (!disk_conf_from_tags(nlp->tag_list, &nbc->dc)) {
b411b363
PR
960 retcode = ERR_MANDATORY_TAG;
961 goto fail;
962 }
963
964 if (nbc->dc.meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
965 retcode = ERR_MD_IDX_INVALID;
966 goto fail;
967 }
968
b2fb6dbe 969 if (get_net_conf(mdev->tconn)) {
89e58e75 970 int prot = mdev->tconn->net_conf->wire_protocol;
b2fb6dbe 971 put_net_conf(mdev->tconn);
47ff2d0a
PR
972 if (nbc->dc.fencing == FP_STONITH && prot == DRBD_PROT_A) {
973 retcode = ERR_STONITH_AND_PROT_A;
974 goto fail;
975 }
976 }
977
d4d77629
TH
978 bdev = blkdev_get_by_path(nbc->dc.backing_dev,
979 FMODE_READ | FMODE_WRITE | FMODE_EXCL, mdev);
e525fd89 980 if (IS_ERR(bdev)) {
b411b363 981 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev,
e525fd89 982 PTR_ERR(bdev));
b411b363
PR
983 retcode = ERR_OPEN_DISK;
984 goto fail;
985 }
e525fd89
TH
986 nbc->backing_bdev = bdev;
987
988 /*
989 * meta_dev_idx >= 0: external fixed size, possibly multiple
990 * drbd sharing one meta device. TODO in that case, paranoia
991 * check that [md_bdev, meta_dev_idx] is not yet used by some
992 * other drbd minor! (if you use drbd.conf + drbdadm, that
993 * should check it for you already; but if you don't, or
994 * someone fooled it, we need to double check here)
995 */
d4d77629
TH
996 bdev = blkdev_get_by_path(nbc->dc.meta_dev,
997 FMODE_READ | FMODE_WRITE | FMODE_EXCL,
998 (nbc->dc.meta_dev_idx < 0) ?
999 (void *)mdev : (void *)drbd_m_holder);
e525fd89 1000 if (IS_ERR(bdev)) {
b411b363 1001 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev,
e525fd89 1002 PTR_ERR(bdev));
b411b363
PR
1003 retcode = ERR_OPEN_MD_DISK;
1004 goto fail;
1005 }
e525fd89 1006 nbc->md_bdev = bdev;
b411b363 1007
e525fd89
TH
1008 if ((nbc->backing_bdev == nbc->md_bdev) !=
1009 (nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
1010 nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
1011 retcode = ERR_MD_IDX_INVALID;
b411b363
PR
1012 goto fail;
1013 }
1014
1015 resync_lru = lc_create("resync", drbd_bm_ext_cache,
46a15bc3 1016 1, 61, sizeof(struct bm_extent),
b411b363
PR
1017 offsetof(struct bm_extent, lce));
1018 if (!resync_lru) {
1019 retcode = ERR_NOMEM;
e525fd89 1020 goto fail;
b411b363
PR
1021 }
1022
1023 /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
1024 drbd_md_set_sector_offsets(mdev, nbc);
1025
1026 if (drbd_get_max_capacity(nbc) < nbc->dc.disk_size) {
1027 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
1028 (unsigned long long) drbd_get_max_capacity(nbc),
1029 (unsigned long long) nbc->dc.disk_size);
1030 retcode = ERR_DISK_TO_SMALL;
e525fd89 1031 goto fail;
b411b363
PR
1032 }
1033
1034 if (nbc->dc.meta_dev_idx < 0) {
1035 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
1036 /* at least one MB, otherwise it does not make sense */
1037 min_md_device_sectors = (2<<10);
1038 } else {
1039 max_possible_sectors = DRBD_MAX_SECTORS;
1040 min_md_device_sectors = MD_RESERVED_SECT * (nbc->dc.meta_dev_idx + 1);
1041 }
1042
b411b363
PR
1043 if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
1044 retcode = ERR_MD_DISK_TO_SMALL;
1045 dev_warn(DEV, "refusing attach: md-device too small, "
1046 "at least %llu sectors needed for this meta-disk type\n",
1047 (unsigned long long) min_md_device_sectors);
e525fd89 1048 goto fail;
b411b363
PR
1049 }
1050
1051 /* Make sure the new disk is big enough
1052 * (we may currently be R_PRIMARY with no local disk...) */
1053 if (drbd_get_max_capacity(nbc) <
1054 drbd_get_capacity(mdev->this_bdev)) {
1055 retcode = ERR_DISK_TO_SMALL;
e525fd89 1056 goto fail;
b411b363
PR
1057 }
1058
1059 nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
1060
1352994b
LE
1061 if (nbc->known_size > max_possible_sectors) {
1062 dev_warn(DEV, "==> truncating very big lower level device "
1063 "to currently maximum possible %llu sectors <==\n",
1064 (unsigned long long) max_possible_sectors);
1065 if (nbc->dc.meta_dev_idx >= 0)
1066 dev_warn(DEV, "==>> using internal or flexible "
1067 "meta data may help <<==\n");
1068 }
1069
b411b363
PR
1070 drbd_suspend_io(mdev);
1071 /* also wait for the last barrier ack. */
fb22c402 1072 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt) || is_susp(mdev->state));
b411b363 1073 /* and for any other previously queued work */
a21e9298 1074 drbd_flush_workqueue(mdev);
b411b363 1075
f2024e7c
AG
1076 rv = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
1077 retcode = rv; /* FIXME: Type mismatch. */
b411b363 1078 drbd_resume_io(mdev);
f2024e7c 1079 if (rv < SS_SUCCESS)
e525fd89 1080 goto fail;
b411b363
PR
1081
1082 if (!get_ldev_if_state(mdev, D_ATTACHING))
1083 goto force_diskless;
1084
1085 drbd_md_set_sector_offsets(mdev, nbc);
1086
1087 if (!mdev->bitmap) {
1088 if (drbd_bm_init(mdev)) {
1089 retcode = ERR_NOMEM;
1090 goto force_diskless_dec;
1091 }
1092 }
1093
1094 retcode = drbd_md_read(mdev, nbc);
1095 if (retcode != NO_ERROR)
1096 goto force_diskless_dec;
1097
1098 if (mdev->state.conn < C_CONNECTED &&
1099 mdev->state.role == R_PRIMARY &&
1100 (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
1101 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
1102 (unsigned long long)mdev->ed_uuid);
1103 retcode = ERR_DATA_NOT_CURRENT;
1104 goto force_diskless_dec;
1105 }
1106
1107 /* Since we are diskless, fix the activity log first... */
1108 if (drbd_check_al_size(mdev)) {
1109 retcode = ERR_NOMEM;
1110 goto force_diskless_dec;
1111 }
1112
1113 /* Prevent shrinking of consistent devices ! */
1114 if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
a393db6f 1115 drbd_new_dev_size(mdev, nbc, 0) < nbc->md.la_size_sect) {
b411b363
PR
1116 dev_warn(DEV, "refusing to truncate a consistent device\n");
1117 retcode = ERR_DISK_TO_SMALL;
1118 goto force_diskless_dec;
1119 }
1120
1121 if (!drbd_al_read_log(mdev, nbc)) {
1122 retcode = ERR_IO_MD_DISK;
1123 goto force_diskless_dec;
1124 }
1125
b411b363
PR
1126 /* Reset the "barriers don't work" bits here, then force meta data to
1127 * be written, to ensure we determine if barriers are supported. */
1128 if (nbc->dc.no_md_flush)
a8a4e51e 1129 set_bit(MD_NO_FUA, &mdev->flags);
b411b363 1130 else
a8a4e51e 1131 clear_bit(MD_NO_FUA, &mdev->flags);
b411b363
PR
1132
1133 /* Point of no return reached.
1134 * Devices and memory are no longer released by error cleanup below.
1135 * now mdev takes over responsibility, and the state engine should
1136 * clean it up somewhere. */
1137 D_ASSERT(mdev->ldev == NULL);
1138 mdev->ldev = nbc;
1139 mdev->resync = resync_lru;
1140 nbc = NULL;
1141 resync_lru = NULL;
1142
2451fc3b
PR
1143 mdev->write_ordering = WO_bdev_flush;
1144 drbd_bump_write_ordering(mdev, WO_bdev_flush);
b411b363
PR
1145
1146 if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
1147 set_bit(CRASHED_PRIMARY, &mdev->flags);
1148 else
1149 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1150
894c6a94 1151 if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
fb22c402 1152 !(mdev->state.role == R_PRIMARY && mdev->state.susp_nod)) {
b411b363
PR
1153 set_bit(CRASHED_PRIMARY, &mdev->flags);
1154 cp_discovered = 1;
1155 }
1156
1157 mdev->send_cnt = 0;
1158 mdev->recv_cnt = 0;
1159 mdev->read_cnt = 0;
1160 mdev->writ_cnt = 0;
1161
99432fcc 1162 drbd_reconsider_max_bio_size(mdev);
b411b363
PR
1163
1164 /* If I am currently not R_PRIMARY,
1165 * but meta data primary indicator is set,
1166 * I just now recover from a hard crash,
1167 * and have been R_PRIMARY before that crash.
1168 *
1169 * Now, if I had no connection before that crash
1170 * (have been degraded R_PRIMARY), chances are that
1171 * I won't find my peer now either.
1172 *
1173 * In that case, and _only_ in that case,
1174 * we use the degr-wfc-timeout instead of the default,
1175 * so we can automatically recover from a crash of a
1176 * degraded but active "cluster" after a certain timeout.
1177 */
1178 clear_bit(USE_DEGR_WFC_T, &mdev->flags);
1179 if (mdev->state.role != R_PRIMARY &&
1180 drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1181 !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
1182 set_bit(USE_DEGR_WFC_T, &mdev->flags);
1183
24c4830c 1184 dd = drbd_determine_dev_size(mdev, 0);
b411b363
PR
1185 if (dd == dev_size_error) {
1186 retcode = ERR_NOMEM_BITMAP;
1187 goto force_diskless_dec;
1188 } else if (dd == grew)
1189 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
1190
1191 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
1192 dev_info(DEV, "Assuming that all blocks are out of sync "
1193 "(aka FullSync)\n");
20ceb2b2
LE
1194 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write,
1195 "set_n_write from attaching", BM_LOCKED_MASK)) {
b411b363
PR
1196 retcode = ERR_IO_MD_DISK;
1197 goto force_diskless_dec;
1198 }
1199 } else {
20ceb2b2
LE
1200 if (drbd_bitmap_io(mdev, &drbd_bm_read,
1201 "read from attaching", BM_LOCKED_MASK) < 0) {
b411b363
PR
1202 retcode = ERR_IO_MD_DISK;
1203 goto force_diskless_dec;
1204 }
1205 }
1206
1207 if (cp_discovered) {
1208 drbd_al_apply_to_bm(mdev);
20ceb2b2
LE
1209 if (drbd_bitmap_io(mdev, &drbd_bm_write,
1210 "crashed primary apply AL", BM_LOCKED_MASK)) {
19f843aa
LE
1211 retcode = ERR_IO_MD_DISK;
1212 goto force_diskless_dec;
1213 }
b411b363
PR
1214 }
1215
0778286a
PR
1216 if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev))
1217 drbd_suspend_al(mdev); /* IO is still suspended here... */
1218
87eeee41 1219 spin_lock_irq(&mdev->tconn->req_lock);
b411b363
PR
1220 os = mdev->state;
1221 ns.i = os.i;
1222 /* If MDF_CONSISTENT is not set go into inconsistent state,
1223 otherwise investigate MDF_WasUpToDate...
1224 If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1225 otherwise into D_CONSISTENT state.
1226 */
1227 if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
1228 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
1229 ns.disk = D_CONSISTENT;
1230 else
1231 ns.disk = D_OUTDATED;
1232 } else {
1233 ns.disk = D_INCONSISTENT;
1234 }
1235
1236 if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
1237 ns.pdsk = D_OUTDATED;
1238
1239 if ( ns.disk == D_CONSISTENT &&
1240 (ns.pdsk == D_OUTDATED || mdev->ldev->dc.fencing == FP_DONT_CARE))
1241 ns.disk = D_UP_TO_DATE;
1242
1243 /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1244 MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1245 this point, because drbd_request_state() modifies these
1246 flags. */
1247
1248 /* In case we are C_CONNECTED postpone any decision on the new disk
1249 state after the negotiation phase. */
1250 if (mdev->state.conn == C_CONNECTED) {
1251 mdev->new_state_tmp.i = ns.i;
1252 ns.i = os.i;
1253 ns.disk = D_NEGOTIATING;
dc66c74d
PR
1254
1255 /* We expect to receive up-to-date UUIDs soon.
1256 To avoid a race in receive_state, free p_uuid while
1257 holding req_lock. I.e. atomic with the state change */
1258 kfree(mdev->p_uuid);
1259 mdev->p_uuid = NULL;
b411b363
PR
1260 }
1261
1262 rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
1263 ns = mdev->state;
87eeee41 1264 spin_unlock_irq(&mdev->tconn->req_lock);
b411b363
PR
1265
1266 if (rv < SS_SUCCESS)
1267 goto force_diskless_dec;
1268
1269 if (mdev->state.role == R_PRIMARY)
1270 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
1271 else
1272 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1273
1274 drbd_md_mark_dirty(mdev);
1275 drbd_md_sync(mdev);
1276
1277 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1278 put_ldev(mdev);
1279 reply->ret_code = retcode;
0e29d163 1280 conn_reconfig_done(mdev->tconn);
b411b363
PR
1281 return 0;
1282
1283 force_diskless_dec:
1284 put_ldev(mdev);
1285 force_diskless:
82f59cc6 1286 drbd_force_state(mdev, NS(disk, D_FAILED));
b411b363 1287 drbd_md_sync(mdev);
b411b363
PR
1288 fail:
1289 if (nbc) {
e525fd89
TH
1290 if (nbc->backing_bdev)
1291 blkdev_put(nbc->backing_bdev,
1292 FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1293 if (nbc->md_bdev)
1294 blkdev_put(nbc->md_bdev,
1295 FMODE_READ | FMODE_WRITE | FMODE_EXCL);
b411b363
PR
1296 kfree(nbc);
1297 }
1298 lc_destroy(resync_lru);
1299
1300 reply->ret_code = retcode;
0e29d163 1301 conn_reconfig_done(mdev->tconn);
b411b363
PR
1302 return 0;
1303}
1304
82f59cc6
LE
1305/* Detaching the disk is a process in multiple stages. First we need to lock
1306 * out application IO, in-flight IO, IO stuck in drbd_al_begin_io.
1307 * Then we transition to D_DISKLESS, and wait for put_ldev() to return all
1308 * internal references as well.
1309 * Only then we have finally detached. */
b411b363
PR
1310static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1311 struct drbd_nl_cfg_reply *reply)
1312{
9a0d9d03
LE
1313 enum drbd_ret_code retcode;
1314 int ret;
82f59cc6 1315 drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */
9a0d9d03
LE
1316 retcode = drbd_request_state(mdev, NS(disk, D_FAILED));
1317 /* D_FAILED will transition to DISKLESS. */
1318 ret = wait_event_interruptible(mdev->misc_wait,
1319 mdev->state.disk != D_FAILED);
82f59cc6 1320 drbd_resume_io(mdev);
9b2f61ae 1321 if ((int)retcode == (int)SS_IS_DISKLESS)
9a0d9d03
LE
1322 retcode = SS_NOTHING_TO_DO;
1323 if (ret)
1324 retcode = ERR_INTR;
1325 reply->ret_code = retcode;
b411b363
PR
1326 return 0;
1327}
1328
80883197 1329static int drbd_nl_net_conf(struct drbd_tconn *tconn, struct drbd_nl_cfg_req *nlp,
b411b363
PR
1330 struct drbd_nl_cfg_reply *reply)
1331{
bb3bfe96 1332 int i;
116676ca 1333 enum drbd_ret_code retcode;
b411b363
PR
1334 struct net_conf *new_conf = NULL;
1335 struct crypto_hash *tfm = NULL;
1336 struct crypto_hash *integrity_w_tfm = NULL;
1337 struct crypto_hash *integrity_r_tfm = NULL;
80883197 1338 struct drbd_conf *mdev;
b411b363
PR
1339 char hmac_name[CRYPTO_MAX_ALG_NAME];
1340 void *int_dig_out = NULL;
1341 void *int_dig_in = NULL;
1342 void *int_dig_vv = NULL;
80883197 1343 struct drbd_tconn *oconn;
b411b363
PR
1344 struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr;
1345
80883197 1346 conn_reconfig_start(tconn);
b411b363 1347
80883197 1348 if (tconn->cstate > C_STANDALONE) {
b411b363
PR
1349 retcode = ERR_NET_CONFIGURED;
1350 goto fail;
1351 }
1352
1353 /* allocation not in the IO path, cqueue thread context */
2db4e42e 1354 new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
b411b363
PR
1355 if (!new_conf) {
1356 retcode = ERR_NOMEM;
1357 goto fail;
1358 }
1359
b411b363
PR
1360 new_conf->timeout = DRBD_TIMEOUT_DEF;
1361 new_conf->try_connect_int = DRBD_CONNECT_INT_DEF;
1362 new_conf->ping_int = DRBD_PING_INT_DEF;
1363 new_conf->max_epoch_size = DRBD_MAX_EPOCH_SIZE_DEF;
1364 new_conf->max_buffers = DRBD_MAX_BUFFERS_DEF;
1365 new_conf->unplug_watermark = DRBD_UNPLUG_WATERMARK_DEF;
1366 new_conf->sndbuf_size = DRBD_SNDBUF_SIZE_DEF;
1367 new_conf->rcvbuf_size = DRBD_RCVBUF_SIZE_DEF;
1368 new_conf->ko_count = DRBD_KO_COUNT_DEF;
1369 new_conf->after_sb_0p = DRBD_AFTER_SB_0P_DEF;
1370 new_conf->after_sb_1p = DRBD_AFTER_SB_1P_DEF;
1371 new_conf->after_sb_2p = DRBD_AFTER_SB_2P_DEF;
1372 new_conf->want_lose = 0;
1373 new_conf->two_primaries = 0;
1374 new_conf->wire_protocol = DRBD_PROT_C;
1375 new_conf->ping_timeo = DRBD_PING_TIMEO_DEF;
1376 new_conf->rr_conflict = DRBD_RR_CONFLICT_DEF;
422028b1
PR
1377 new_conf->on_congestion = DRBD_ON_CONGESTION_DEF;
1378 new_conf->cong_extents = DRBD_CONG_EXTENTS_DEF;
b411b363 1379
3f9cbe93 1380 if (!net_conf_from_tags(nlp->tag_list, new_conf)) {
b411b363
PR
1381 retcode = ERR_MANDATORY_TAG;
1382 goto fail;
1383 }
1384
1385 if (new_conf->two_primaries
1386 && (new_conf->wire_protocol != DRBD_PROT_C)) {
1387 retcode = ERR_NOT_PROTO_C;
1388 goto fail;
47ff2d0a
PR
1389 }
1390
80883197
PR
1391 idr_for_each_entry(&tconn->volumes, mdev, i) {
1392 if (get_ldev(mdev)) {
1393 enum drbd_fencing_p fp = mdev->ldev->dc.fencing;
1394 put_ldev(mdev);
1395 if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH) {
1396 retcode = ERR_STONITH_AND_PROT_A;
1397 goto fail;
1398 }
1399 }
1400 if (mdev->state.role == R_PRIMARY && new_conf->want_lose) {
1401 retcode = ERR_DISCARD;
47ff2d0a
PR
1402 goto fail;
1403 }
80883197
PR
1404 if (!mdev->bitmap) {
1405 if(drbd_bm_init(mdev)) {
1406 retcode = ERR_NOMEM;
1407 goto fail;
1408 }
1409 }
47ff2d0a 1410 }
b411b363 1411
422028b1
PR
1412 if (new_conf->on_congestion != OC_BLOCK && new_conf->wire_protocol != DRBD_PROT_A) {
1413 retcode = ERR_CONG_NOT_PROTO_A;
1414 goto fail;
1415 }
1416
b411b363
PR
1417 retcode = NO_ERROR;
1418
1419 new_my_addr = (struct sockaddr *)&new_conf->my_addr;
1420 new_peer_addr = (struct sockaddr *)&new_conf->peer_addr;
80883197
PR
1421 list_for_each_entry(oconn, &drbd_tconns, all_tconn) {
1422 if (oconn == tconn)
b411b363 1423 continue;
80883197
PR
1424 if (get_net_conf(oconn)) {
1425 taken_addr = (struct sockaddr *)&oconn->net_conf->my_addr;
1426 if (new_conf->my_addr_len == oconn->net_conf->my_addr_len &&
b411b363
PR
1427 !memcmp(new_my_addr, taken_addr, new_conf->my_addr_len))
1428 retcode = ERR_LOCAL_ADDR;
1429
80883197
PR
1430 taken_addr = (struct sockaddr *)&oconn->net_conf->peer_addr;
1431 if (new_conf->peer_addr_len == oconn->net_conf->peer_addr_len &&
b411b363
PR
1432 !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len))
1433 retcode = ERR_PEER_ADDR;
1434
80883197 1435 put_net_conf(oconn);
b411b363
PR
1436 if (retcode != NO_ERROR)
1437 goto fail;
1438 }
1439 }
1440
1441 if (new_conf->cram_hmac_alg[0] != 0) {
1442 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
1443 new_conf->cram_hmac_alg);
1444 tfm = crypto_alloc_hash(hmac_name, 0, CRYPTO_ALG_ASYNC);
1445 if (IS_ERR(tfm)) {
1446 tfm = NULL;
1447 retcode = ERR_AUTH_ALG;
1448 goto fail;
1449 }
1450
0798219f 1451 if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) {
b411b363
PR
1452 retcode = ERR_AUTH_ALG_ND;
1453 goto fail;
1454 }
1455 }
1456
1457 if (new_conf->integrity_alg[0]) {
1458 integrity_w_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1459 if (IS_ERR(integrity_w_tfm)) {
1460 integrity_w_tfm = NULL;
1461 retcode=ERR_INTEGRITY_ALG;
1462 goto fail;
1463 }
1464
1465 if (!drbd_crypto_is_hash(crypto_hash_tfm(integrity_w_tfm))) {
1466 retcode=ERR_INTEGRITY_ALG_ND;
1467 goto fail;
1468 }
1469
1470 integrity_r_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1471 if (IS_ERR(integrity_r_tfm)) {
1472 integrity_r_tfm = NULL;
1473 retcode=ERR_INTEGRITY_ALG;
1474 goto fail;
1475 }
1476 }
1477
b411b363
PR
1478 ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
1479
80883197 1480 /* allocation not in the IO path, cqueue thread context */
b411b363
PR
1481 if (integrity_w_tfm) {
1482 i = crypto_hash_digestsize(integrity_w_tfm);
1483 int_dig_out = kmalloc(i, GFP_KERNEL);
1484 if (!int_dig_out) {
1485 retcode = ERR_NOMEM;
1486 goto fail;
1487 }
1488 int_dig_in = kmalloc(i, GFP_KERNEL);
1489 if (!int_dig_in) {
1490 retcode = ERR_NOMEM;
1491 goto fail;
1492 }
1493 int_dig_vv = kmalloc(i, GFP_KERNEL);
1494 if (!int_dig_vv) {
1495 retcode = ERR_NOMEM;
1496 goto fail;
1497 }
1498 }
1499
80883197
PR
1500 conn_flush_workqueue(tconn);
1501 spin_lock_irq(&tconn->req_lock);
1502 if (tconn->net_conf != NULL) {
b411b363 1503 retcode = ERR_NET_CONFIGURED;
80883197 1504 spin_unlock_irq(&tconn->req_lock);
b411b363
PR
1505 goto fail;
1506 }
80883197 1507 tconn->net_conf = new_conf;
b411b363 1508
80883197
PR
1509 crypto_free_hash(tconn->cram_hmac_tfm);
1510 tconn->cram_hmac_tfm = tfm;
b411b363 1511
80883197
PR
1512 crypto_free_hash(tconn->integrity_w_tfm);
1513 tconn->integrity_w_tfm = integrity_w_tfm;
b411b363 1514
80883197
PR
1515 crypto_free_hash(tconn->integrity_r_tfm);
1516 tconn->integrity_r_tfm = integrity_r_tfm;
b411b363 1517
80883197
PR
1518 kfree(tconn->int_dig_out);
1519 kfree(tconn->int_dig_in);
1520 kfree(tconn->int_dig_vv);
1521 tconn->int_dig_out=int_dig_out;
1522 tconn->int_dig_in=int_dig_in;
1523 tconn->int_dig_vv=int_dig_vv;
1524 retcode = _conn_request_state(tconn, NS(conn, C_UNCONNECTED), CS_VERBOSE);
1525 spin_unlock_irq(&tconn->req_lock);
b411b363 1526
80883197
PR
1527 idr_for_each_entry(&tconn->volumes, mdev, i) {
1528 mdev->send_cnt = 0;
1529 mdev->recv_cnt = 0;
1530 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1531 }
b411b363 1532 reply->ret_code = retcode;
80883197 1533 conn_reconfig_done(tconn);
b411b363
PR
1534 return 0;
1535
1536fail:
1537 kfree(int_dig_out);
1538 kfree(int_dig_in);
1539 kfree(int_dig_vv);
1540 crypto_free_hash(tfm);
1541 crypto_free_hash(integrity_w_tfm);
1542 crypto_free_hash(integrity_r_tfm);
b411b363
PR
1543 kfree(new_conf);
1544
1545 reply->ret_code = retcode;
80883197 1546 conn_reconfig_done(tconn);
b411b363
PR
1547 return 0;
1548}
1549
80883197 1550static int drbd_nl_disconnect(struct drbd_tconn *tconn, struct drbd_nl_cfg_req *nlp,
b411b363
PR
1551 struct drbd_nl_cfg_reply *reply)
1552{
1553 int retcode;
2561b9c1
PR
1554 struct disconnect dc;
1555
1556 memset(&dc, 0, sizeof(struct disconnect));
3f9cbe93 1557 if (!disconnect_from_tags(nlp->tag_list, &dc)) {
2561b9c1
PR
1558 retcode = ERR_MANDATORY_TAG;
1559 goto fail;
1560 }
1561
1562 if (dc.force) {
df24aa45
PR
1563 spin_lock_irq(&tconn->req_lock);
1564 if (tconn->cstate >= C_WF_CONNECTION)
1565 _conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD);
1566 spin_unlock_irq(&tconn->req_lock);
2561b9c1
PR
1567 goto done;
1568 }
b411b363 1569
df24aa45 1570 retcode = conn_request_state(tconn, NS(conn, C_DISCONNECTING), 0);
b411b363
PR
1571
1572 if (retcode == SS_NOTHING_TO_DO)
1573 goto done;
1574 else if (retcode == SS_ALREADY_STANDALONE)
1575 goto done;
1576 else if (retcode == SS_PRIMARY_NOP) {
df24aa45
PR
1577 /* Our state checking code wants to see the peer outdated. */
1578 retcode = conn_request_state(tconn, NS2(conn, C_DISCONNECTING,
1579 pdsk, D_OUTDATED), CS_VERBOSE);
b411b363
PR
1580 } else if (retcode == SS_CW_FAILED_BY_PEER) {
1581 /* The peer probably wants to see us outdated. */
df24aa45
PR
1582 retcode = conn_request_state(tconn, NS2(conn, C_DISCONNECTING,
1583 disk, D_OUTDATED), 0);
b411b363 1584 if (retcode == SS_IS_DISKLESS || retcode == SS_LOWER_THAN_OUTDATED) {
df24aa45 1585 conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD);
b411b363
PR
1586 retcode = SS_SUCCESS;
1587 }
1588 }
1589
1590 if (retcode < SS_SUCCESS)
1591 goto fail;
1592
df24aa45
PR
1593 if (wait_event_interruptible(tconn->ping_wait,
1594 tconn->cstate != C_DISCONNECTING)) {
b411b363
PR
1595 /* Do not test for mdev->state.conn == C_STANDALONE, since
1596 someone else might connect us in the mean time! */
1597 retcode = ERR_INTR;
1598 goto fail;
1599 }
1600
1601 done:
1602 retcode = NO_ERROR;
1603 fail:
b411b363
PR
1604 reply->ret_code = retcode;
1605 return 0;
1606}
1607
1608void resync_after_online_grow(struct drbd_conf *mdev)
1609{
1610 int iass; /* I am sync source */
1611
1612 dev_info(DEV, "Resync of new storage after online grow\n");
1613 if (mdev->state.role != mdev->state.peer)
1614 iass = (mdev->state.role == R_PRIMARY);
1615 else
25703f83 1616 iass = test_bit(DISCARD_CONCURRENT, &mdev->tconn->flags);
b411b363
PR
1617
1618 if (iass)
1619 drbd_start_resync(mdev, C_SYNC_SOURCE);
1620 else
1621 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
1622}
1623
1624static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1625 struct drbd_nl_cfg_reply *reply)
1626{
1627 struct resize rs;
1628 int retcode = NO_ERROR;
b411b363 1629 enum determine_dev_size dd;
6495d2c6 1630 enum dds_flags ddsf;
b411b363
PR
1631
1632 memset(&rs, 0, sizeof(struct resize));
3f9cbe93 1633 if (!resize_from_tags(nlp->tag_list, &rs)) {
b411b363
PR
1634 retcode = ERR_MANDATORY_TAG;
1635 goto fail;
1636 }
1637
1638 if (mdev->state.conn > C_CONNECTED) {
1639 retcode = ERR_RESIZE_RESYNC;
1640 goto fail;
1641 }
1642
1643 if (mdev->state.role == R_SECONDARY &&
1644 mdev->state.peer == R_SECONDARY) {
1645 retcode = ERR_NO_PRIMARY;
1646 goto fail;
1647 }
1648
1649 if (!get_ldev(mdev)) {
1650 retcode = ERR_NO_DISK;
1651 goto fail;
1652 }
1653
31890f4a 1654 if (rs.no_resync && mdev->tconn->agreed_pro_version < 93) {
6495d2c6
PR
1655 retcode = ERR_NEED_APV_93;
1656 goto fail;
1657 }
1658
087c2492 1659 if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev))
b411b363 1660 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
b411b363
PR
1661
1662 mdev->ldev->dc.disk_size = (sector_t)rs.resize_size;
6495d2c6 1663 ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
24c4830c 1664 dd = drbd_determine_dev_size(mdev, ddsf);
b411b363
PR
1665 drbd_md_sync(mdev);
1666 put_ldev(mdev);
1667 if (dd == dev_size_error) {
1668 retcode = ERR_NOMEM_BITMAP;
1669 goto fail;
1670 }
1671
087c2492 1672 if (mdev->state.conn == C_CONNECTED) {
b411b363
PR
1673 if (dd == grew)
1674 set_bit(RESIZE_PENDING, &mdev->flags);
1675
1676 drbd_send_uuids(mdev);
6495d2c6 1677 drbd_send_sizes(mdev, 1, ddsf);
b411b363
PR
1678 }
1679
1680 fail:
1681 reply->ret_code = retcode;
1682 return 0;
1683}
1684
1685static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1686 struct drbd_nl_cfg_reply *reply)
1687{
1688 int retcode = NO_ERROR;
1689 int err;
1690 int ovr; /* online verify running */
1691 int rsr; /* re-sync running */
1692 struct crypto_hash *verify_tfm = NULL;
1693 struct crypto_hash *csums_tfm = NULL;
1694 struct syncer_conf sc;
1695 cpumask_var_t new_cpu_mask;
778f271d
PR
1696 int *rs_plan_s = NULL;
1697 int fifo_size;
b411b363
PR
1698
1699 if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) {
1700 retcode = ERR_NOMEM;
1701 goto fail;
1702 }
1703
1704 if (nlp->flags & DRBD_NL_SET_DEFAULTS) {
1705 memset(&sc, 0, sizeof(struct syncer_conf));
1706 sc.rate = DRBD_RATE_DEF;
1707 sc.after = DRBD_AFTER_DEF;
1708 sc.al_extents = DRBD_AL_EXTENTS_DEF;
265be2d0 1709 sc.on_no_data = DRBD_ON_NO_DATA_DEF;
9a31d716
PR
1710 sc.c_plan_ahead = DRBD_C_PLAN_AHEAD_DEF;
1711 sc.c_delay_target = DRBD_C_DELAY_TARGET_DEF;
1712 sc.c_fill_target = DRBD_C_FILL_TARGET_DEF;
0f0601f4
LE
1713 sc.c_max_rate = DRBD_C_MAX_RATE_DEF;
1714 sc.c_min_rate = DRBD_C_MIN_RATE_DEF;
b411b363
PR
1715 } else
1716 memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf));
1717
3f9cbe93 1718 if (!syncer_conf_from_tags(nlp->tag_list, &sc)) {
b411b363
PR
1719 retcode = ERR_MANDATORY_TAG;
1720 goto fail;
1721 }
1722
1723 /* re-sync running */
1724 rsr = ( mdev->state.conn == C_SYNC_SOURCE ||
1725 mdev->state.conn == C_SYNC_TARGET ||
1726 mdev->state.conn == C_PAUSED_SYNC_S ||
1727 mdev->state.conn == C_PAUSED_SYNC_T );
1728
1729 if (rsr && strcmp(sc.csums_alg, mdev->sync_conf.csums_alg)) {
1730 retcode = ERR_CSUMS_RESYNC_RUNNING;
1731 goto fail;
1732 }
1733
1734 if (!rsr && sc.csums_alg[0]) {
1735 csums_tfm = crypto_alloc_hash(sc.csums_alg, 0, CRYPTO_ALG_ASYNC);
1736 if (IS_ERR(csums_tfm)) {
1737 csums_tfm = NULL;
1738 retcode = ERR_CSUMS_ALG;
1739 goto fail;
1740 }
1741
1742 if (!drbd_crypto_is_hash(crypto_hash_tfm(csums_tfm))) {
1743 retcode = ERR_CSUMS_ALG_ND;
1744 goto fail;
1745 }
1746 }
1747
1748 /* online verify running */
1749 ovr = (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T);
1750
1751 if (ovr) {
1752 if (strcmp(sc.verify_alg, mdev->sync_conf.verify_alg)) {
1753 retcode = ERR_VERIFY_RUNNING;
1754 goto fail;
1755 }
1756 }
1757
1758 if (!ovr && sc.verify_alg[0]) {
1759 verify_tfm = crypto_alloc_hash(sc.verify_alg, 0, CRYPTO_ALG_ASYNC);
1760 if (IS_ERR(verify_tfm)) {
1761 verify_tfm = NULL;
1762 retcode = ERR_VERIFY_ALG;
1763 goto fail;
1764 }
1765
1766 if (!drbd_crypto_is_hash(crypto_hash_tfm(verify_tfm))) {
1767 retcode = ERR_VERIFY_ALG_ND;
1768 goto fail;
1769 }
1770 }
1771
1772 /* silently ignore cpu mask on UP kernel */
1773 if (nr_cpu_ids > 1 && sc.cpu_mask[0] != 0) {
1774 err = __bitmap_parse(sc.cpu_mask, 32, 0,
1775 cpumask_bits(new_cpu_mask), nr_cpu_ids);
1776 if (err) {
1777 dev_warn(DEV, "__bitmap_parse() failed with %d\n", err);
1778 retcode = ERR_CPU_MASK_PARSE;
1779 goto fail;
1780 }
1781 }
1782
841ce241
AG
1783 if (!expect(sc.rate >= 1))
1784 sc.rate = 1;
7ad651b5
LE
1785
1786 /* clip to allowed range */
1787 if (!expect(sc.al_extents >= DRBD_AL_EXTENTS_MIN))
1788 sc.al_extents = DRBD_AL_EXTENTS_MIN;
1789 if (!expect(sc.al_extents <= DRBD_AL_EXTENTS_MAX))
1790 sc.al_extents = DRBD_AL_EXTENTS_MAX;
b411b363 1791
ef50a3e3
LE
1792 /* to avoid spurious errors when configuring minors before configuring
1793 * the minors they depend on: if necessary, first create the minor we
1794 * depend on */
1795 if (sc.after >= 0)
1796 ensure_mdev(sc.after, 1);
1797
b411b363
PR
1798 /* most sanity checks done, try to assign the new sync-after
1799 * dependency. need to hold the global lock in there,
1800 * to avoid a race in the dependency loop check. */
1801 retcode = drbd_alter_sa(mdev, sc.after);
1802 if (retcode != NO_ERROR)
1803 goto fail;
1804
778f271d
PR
1805 fifo_size = (sc.c_plan_ahead * 10 * SLEEP_TIME) / HZ;
1806 if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) {
1807 rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL);
1808 if (!rs_plan_s) {
1809 dev_err(DEV, "kmalloc of fifo_buffer failed");
1810 retcode = ERR_NOMEM;
1811 goto fail;
1812 }
1813 }
1814
b411b363
PR
1815 /* ok, assign the rest of it as well.
1816 * lock against receive_SyncParam() */
1817 spin_lock(&mdev->peer_seq_lock);
1818 mdev->sync_conf = sc;
1819
1820 if (!rsr) {
1821 crypto_free_hash(mdev->csums_tfm);
1822 mdev->csums_tfm = csums_tfm;
1823 csums_tfm = NULL;
1824 }
1825
1826 if (!ovr) {
1827 crypto_free_hash(mdev->verify_tfm);
1828 mdev->verify_tfm = verify_tfm;
1829 verify_tfm = NULL;
1830 }
778f271d
PR
1831
1832 if (fifo_size != mdev->rs_plan_s.size) {
1833 kfree(mdev->rs_plan_s.values);
1834 mdev->rs_plan_s.values = rs_plan_s;
1835 mdev->rs_plan_s.size = fifo_size;
1836 mdev->rs_planed = 0;
1837 rs_plan_s = NULL;
1838 }
1839
b411b363
PR
1840 spin_unlock(&mdev->peer_seq_lock);
1841
1842 if (get_ldev(mdev)) {
1843 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
1844 drbd_al_shrink(mdev);
1845 err = drbd_check_al_size(mdev);
1846 lc_unlock(mdev->act_log);
1847 wake_up(&mdev->al_wait);
1848
1849 put_ldev(mdev);
1850 drbd_md_sync(mdev);
1851
1852 if (err) {
1853 retcode = ERR_NOMEM;
1854 goto fail;
1855 }
1856 }
1857
1858 if (mdev->state.conn >= C_CONNECTED)
1859 drbd_send_sync_param(mdev, &sc);
1860
80822284
PR
1861 if (!cpumask_equal(mdev->tconn->cpu_mask, new_cpu_mask)) {
1862 cpumask_copy(mdev->tconn->cpu_mask, new_cpu_mask);
1863 drbd_calc_cpu_mask(mdev->tconn);
e6b3ea83
PR
1864 mdev->tconn->receiver.reset_cpu_mask = 1;
1865 mdev->tconn->asender.reset_cpu_mask = 1;
1866 mdev->tconn->worker.reset_cpu_mask = 1;
b411b363
PR
1867 }
1868
1869 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1870fail:
778f271d 1871 kfree(rs_plan_s);
b411b363
PR
1872 free_cpumask_var(new_cpu_mask);
1873 crypto_free_hash(csums_tfm);
1874 crypto_free_hash(verify_tfm);
1875 reply->ret_code = retcode;
1876 return 0;
1877}
1878
1879static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1880 struct drbd_nl_cfg_reply *reply)
1881{
1882 int retcode;
1883
194bfb32
LE
1884 /* If there is still bitmap IO pending, probably because of a previous
1885 * resync just being finished, wait for it before requesting a new resync. */
1886 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
1887
b411b363
PR
1888 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
1889
1890 if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
1891 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1892
1893 while (retcode == SS_NEED_CONNECTION) {
87eeee41 1894 spin_lock_irq(&mdev->tconn->req_lock);
b411b363
PR
1895 if (mdev->state.conn < C_CONNECTED)
1896 retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL);
87eeee41 1897 spin_unlock_irq(&mdev->tconn->req_lock);
b411b363
PR
1898
1899 if (retcode != SS_NEED_CONNECTION)
1900 break;
1901
1902 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1903 }
1904
1905 reply->ret_code = retcode;
1906 return 0;
1907}
1908
0778286a
PR
1909static int drbd_bmio_set_susp_al(struct drbd_conf *mdev)
1910{
1911 int rv;
1912
1913 rv = drbd_bmio_set_n_write(mdev);
1914 drbd_suspend_al(mdev);
1915 return rv;
1916}
1917
b411b363
PR
1918static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1919 struct drbd_nl_cfg_reply *reply)
1920{
0778286a 1921 int retcode;
b411b363 1922
194bfb32
LE
1923 /* If there is still bitmap IO pending, probably because of a previous
1924 * resync just being finished, wait for it before requesting a new resync. */
1925 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
1926
0778286a
PR
1927 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED);
1928
1929 if (retcode < SS_SUCCESS) {
1930 if (retcode == SS_NEED_CONNECTION && mdev->state.role == R_PRIMARY) {
1931 /* The peer will get a resync upon connect anyways. Just make that
1932 into a full resync. */
1933 retcode = drbd_request_state(mdev, NS(pdsk, D_INCONSISTENT));
1934 if (retcode >= SS_SUCCESS) {
0778286a 1935 if (drbd_bitmap_io(mdev, &drbd_bmio_set_susp_al,
20ceb2b2
LE
1936 "set_n_write from invalidate_peer",
1937 BM_LOCKED_SET_ALLOWED))
0778286a
PR
1938 retcode = ERR_IO_MD_DISK;
1939 }
1940 } else
1941 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
1942 }
b411b363 1943
0778286a 1944 reply->ret_code = retcode;
b411b363
PR
1945 return 0;
1946}
1947
1948static int drbd_nl_pause_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1949 struct drbd_nl_cfg_reply *reply)
1950{
1951 int retcode = NO_ERROR;
1952
1953 if (drbd_request_state(mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
1954 retcode = ERR_PAUSE_IS_SET;
1955
1956 reply->ret_code = retcode;
1957 return 0;
1958}
1959
1960static int drbd_nl_resume_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1961 struct drbd_nl_cfg_reply *reply)
1962{
1963 int retcode = NO_ERROR;
cd88d030 1964 union drbd_state s;
b411b363 1965
cd88d030
PR
1966 if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO) {
1967 s = mdev->state;
1968 if (s.conn == C_PAUSED_SYNC_S || s.conn == C_PAUSED_SYNC_T) {
1969 retcode = s.aftr_isp ? ERR_PIC_AFTER_DEP :
1970 s.peer_isp ? ERR_PIC_PEER_DEP : ERR_PAUSE_IS_CLEAR;
1971 } else {
1972 retcode = ERR_PAUSE_IS_CLEAR;
1973 }
1974 }
b411b363
PR
1975
1976 reply->ret_code = retcode;
1977 return 0;
1978}
1979
1980static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1981 struct drbd_nl_cfg_reply *reply)
1982{
1983 reply->ret_code = drbd_request_state(mdev, NS(susp, 1));
1984
1985 return 0;
1986}
1987
1988static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1989 struct drbd_nl_cfg_reply *reply)
1990{
43a5182c
PR
1991 if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
1992 drbd_uuid_new_current(mdev);
1993 clear_bit(NEW_CUR_UUID, &mdev->flags);
43a5182c 1994 }
265be2d0 1995 drbd_suspend_io(mdev);
fb22c402 1996 reply->ret_code = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0));
265be2d0
PR
1997 if (reply->ret_code == SS_SUCCESS) {
1998 if (mdev->state.conn < C_CONNECTED)
2f5cdd0b 1999 tl_clear(mdev->tconn);
265be2d0 2000 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED)
2f5cdd0b 2001 tl_restart(mdev->tconn, FAIL_FROZEN_DISK_IO);
265be2d0
PR
2002 }
2003 drbd_resume_io(mdev);
2004
b411b363
PR
2005 return 0;
2006}
2007
2008static int drbd_nl_outdate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2009 struct drbd_nl_cfg_reply *reply)
2010{
2011 reply->ret_code = drbd_request_state(mdev, NS(disk, D_OUTDATED));
2012 return 0;
2013}
2014
2015static int drbd_nl_get_config(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2016 struct drbd_nl_cfg_reply *reply)
2017{
2018 unsigned short *tl;
2019
2020 tl = reply->tag_list;
2021
2022 if (get_ldev(mdev)) {
3f9cbe93 2023 tl = disk_conf_to_tags(&mdev->ldev->dc, tl);
b411b363
PR
2024 put_ldev(mdev);
2025 }
2026
b2fb6dbe 2027 if (get_net_conf(mdev->tconn)) {
3f9cbe93 2028 tl = net_conf_to_tags(mdev->tconn->net_conf, tl);
b2fb6dbe 2029 put_net_conf(mdev->tconn);
b411b363 2030 }
3f9cbe93 2031 tl = syncer_conf_to_tags(&mdev->sync_conf, tl);
b411b363
PR
2032
2033 put_unaligned(TT_END, tl++); /* Close the tag list */
2034
2035 return (int)((char *)tl - (char *)reply->tag_list);
2036}
2037
2038static int drbd_nl_get_state(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2039 struct drbd_nl_cfg_reply *reply)
2040{
2041 unsigned short *tl = reply->tag_list;
2042 union drbd_state s = mdev->state;
2043 unsigned long rs_left;
2044 unsigned int res;
2045
3f9cbe93 2046 tl = get_state_to_tags((struct get_state *)&s, tl);
b411b363
PR
2047
2048 /* no local ref, no bitmap, no syncer progress. */
2049 if (s.conn >= C_SYNC_SOURCE && s.conn <= C_PAUSED_SYNC_T) {
2050 if (get_ldev(mdev)) {
2051 drbd_get_syncer_progress(mdev, &rs_left, &res);
2052 tl = tl_add_int(tl, T_sync_progress, &res);
2053 put_ldev(mdev);
2054 }
2055 }
2056 put_unaligned(TT_END, tl++); /* Close the tag list */
2057
2058 return (int)((char *)tl - (char *)reply->tag_list);
2059}
2060
2061static int drbd_nl_get_uuids(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2062 struct drbd_nl_cfg_reply *reply)
2063{
2064 unsigned short *tl;
2065
2066 tl = reply->tag_list;
2067
2068 if (get_ldev(mdev)) {
2069 tl = tl_add_blob(tl, T_uuids, mdev->ldev->md.uuid, UI_SIZE*sizeof(u64));
2070 tl = tl_add_int(tl, T_uuids_flags, &mdev->ldev->md.flags);
2071 put_ldev(mdev);
2072 }
2073 put_unaligned(TT_END, tl++); /* Close the tag list */
2074
2075 return (int)((char *)tl - (char *)reply->tag_list);
2076}
2077
2078/**
2079 * drbd_nl_get_timeout_flag() - Used by drbdsetup to find out which timeout value to use
2080 * @mdev: DRBD device.
2081 * @nlp: Netlink/connector packet from drbdsetup
2082 * @reply: Reply packet for drbdsetup
2083 */
2084static int drbd_nl_get_timeout_flag(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2085 struct drbd_nl_cfg_reply *reply)
2086{
2087 unsigned short *tl;
2088 char rv;
2089
2090 tl = reply->tag_list;
2091
2092 rv = mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
2093 test_bit(USE_DEGR_WFC_T, &mdev->flags) ? UT_DEGRADED : UT_DEFAULT;
2094
2095 tl = tl_add_blob(tl, T_use_degraded, &rv, sizeof(rv));
2096 put_unaligned(TT_END, tl++); /* Close the tag list */
2097
2098 return (int)((char *)tl - (char *)reply->tag_list);
2099}
2100
2101static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2102 struct drbd_nl_cfg_reply *reply)
2103{
2104 /* default to resume from last known position, if possible */
2105 struct start_ov args =
2106 { .start_sector = mdev->ov_start_sector };
2107
3f9cbe93 2108 if (!start_ov_from_tags(nlp->tag_list, &args)) {
b411b363
PR
2109 reply->ret_code = ERR_MANDATORY_TAG;
2110 return 0;
2111 }
873b0d5f
LE
2112
2113 /* If there is still bitmap IO pending, e.g. previous resync or verify
2114 * just being finished, wait for it before requesting a new resync. */
2115 wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
2116
b411b363
PR
2117 /* w_make_ov_request expects position to be aligned */
2118 mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT;
2119 reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
2120 return 0;
2121}
2122
2123
2124static int drbd_nl_new_c_uuid(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2125 struct drbd_nl_cfg_reply *reply)
2126{
2127 int retcode = NO_ERROR;
2128 int skip_initial_sync = 0;
2129 int err;
2130
2131 struct new_c_uuid args;
2132
2133 memset(&args, 0, sizeof(struct new_c_uuid));
3f9cbe93 2134 if (!new_c_uuid_from_tags(nlp->tag_list, &args)) {
b411b363
PR
2135 reply->ret_code = ERR_MANDATORY_TAG;
2136 return 0;
2137 }
2138
8410da8f 2139 mutex_lock(mdev->state_mutex); /* Protects us against serialized state changes. */
b411b363
PR
2140
2141 if (!get_ldev(mdev)) {
2142 retcode = ERR_NO_DISK;
2143 goto out;
2144 }
2145
2146 /* this is "skip initial sync", assume to be clean */
31890f4a 2147 if (mdev->state.conn == C_CONNECTED && mdev->tconn->agreed_pro_version >= 90 &&
b411b363
PR
2148 mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
2149 dev_info(DEV, "Preparing to skip initial sync\n");
2150 skip_initial_sync = 1;
2151 } else if (mdev->state.conn != C_STANDALONE) {
2152 retcode = ERR_CONNECTED;
2153 goto out_dec;
2154 }
2155
2156 drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
2157 drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
2158
2159 if (args.clear_bm) {
20ceb2b2
LE
2160 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write,
2161 "clear_n_write from new_c_uuid", BM_LOCKED_MASK);
b411b363
PR
2162 if (err) {
2163 dev_err(DEV, "Writing bitmap failed with %d\n",err);
2164 retcode = ERR_IO_MD_DISK;
2165 }
2166 if (skip_initial_sync) {
2167 drbd_send_uuids_skip_initial_sync(mdev);
2168 _drbd_uuid_set(mdev, UI_BITMAP, 0);
62b0da3a 2169 drbd_print_uuids(mdev, "cleared bitmap UUID");
87eeee41 2170 spin_lock_irq(&mdev->tconn->req_lock);
b411b363
PR
2171 _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
2172 CS_VERBOSE, NULL);
87eeee41 2173 spin_unlock_irq(&mdev->tconn->req_lock);
b411b363
PR
2174 }
2175 }
2176
2177 drbd_md_sync(mdev);
2178out_dec:
2179 put_ldev(mdev);
2180out:
8410da8f 2181 mutex_unlock(mdev->state_mutex);
b411b363
PR
2182
2183 reply->ret_code = retcode;
2184 return 0;
2185}
2186
1aba4d7f
PR
2187enum cn_handler_type {
2188 CHT_MINOR,
2189 CHT_CONN,
2190 CHT_CTOR,
2191 /* CHT_RES, later */
2192};
2193
b411b363 2194struct cn_handler_struct {
1aba4d7f
PR
2195 enum cn_handler_type type;
2196 union {
2197 int (*minor_based)(struct drbd_conf *,
2198 struct drbd_nl_cfg_req *,
2199 struct drbd_nl_cfg_reply *);
2200 int (*conn_based)(struct drbd_tconn *,
2201 struct drbd_nl_cfg_req *,
2202 struct drbd_nl_cfg_reply *);
2203 int (*constructor)(struct drbd_nl_cfg_req *,
2204 struct drbd_nl_cfg_reply *);
2205 };
b411b363
PR
2206 int reply_body_size;
2207};
2208
2209static struct cn_handler_struct cnd_table[] = {
1aba4d7f
PR
2210 [ P_primary ] = { CHT_MINOR, { &drbd_nl_primary }, 0 },
2211 [ P_secondary ] = { CHT_MINOR, { &drbd_nl_secondary }, 0 },
2212 [ P_disk_conf ] = { CHT_MINOR, { &drbd_nl_disk_conf }, 0 },
2213 [ P_detach ] = { CHT_MINOR, { &drbd_nl_detach }, 0 },
80883197
PR
2214 [ P_net_conf ] = { CHT_CONN, { .conn_based = &drbd_nl_net_conf }, 0 },
2215 [ P_disconnect ] = { CHT_CONN, { .conn_based = &drbd_nl_disconnect }, 0 },
1aba4d7f
PR
2216 [ P_resize ] = { CHT_MINOR, { &drbd_nl_resize }, 0 },
2217 [ P_syncer_conf ] = { CHT_MINOR, { &drbd_nl_syncer_conf },0 },
2218 [ P_invalidate ] = { CHT_MINOR, { &drbd_nl_invalidate }, 0 },
2219 [ P_invalidate_peer ] = { CHT_MINOR, { &drbd_nl_invalidate_peer },0 },
2220 [ P_pause_sync ] = { CHT_MINOR, { &drbd_nl_pause_sync }, 0 },
2221 [ P_resume_sync ] = { CHT_MINOR, { &drbd_nl_resume_sync },0 },
2222 [ P_suspend_io ] = { CHT_MINOR, { &drbd_nl_suspend_io }, 0 },
2223 [ P_resume_io ] = { CHT_MINOR, { &drbd_nl_resume_io }, 0 },
2224 [ P_outdate ] = { CHT_MINOR, { &drbd_nl_outdate }, 0 },
2225 [ P_get_config ] = { CHT_MINOR, { &drbd_nl_get_config },
b411b363
PR
2226 sizeof(struct syncer_conf_tag_len_struct) +
2227 sizeof(struct disk_conf_tag_len_struct) +
2228 sizeof(struct net_conf_tag_len_struct) },
1aba4d7f 2229 [ P_get_state ] = { CHT_MINOR, { &drbd_nl_get_state },
b411b363
PR
2230 sizeof(struct get_state_tag_len_struct) +
2231 sizeof(struct sync_progress_tag_len_struct) },
1aba4d7f 2232 [ P_get_uuids ] = { CHT_MINOR, { &drbd_nl_get_uuids },
b411b363 2233 sizeof(struct get_uuids_tag_len_struct) },
1aba4d7f 2234 [ P_get_timeout_flag ] = { CHT_MINOR, { &drbd_nl_get_timeout_flag },
b411b363 2235 sizeof(struct get_timeout_flag_tag_len_struct)},
1aba4d7f
PR
2236 [ P_start_ov ] = { CHT_MINOR, { &drbd_nl_start_ov }, 0 },
2237 [ P_new_c_uuid ] = { CHT_MINOR, { &drbd_nl_new_c_uuid }, 0 },
b411b363
PR
2238};
2239
9f5180e5 2240static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp)
b411b363
PR
2241{
2242 struct drbd_nl_cfg_req *nlp = (struct drbd_nl_cfg_req *)req->data;
2243 struct cn_handler_struct *cm;
2244 struct cn_msg *cn_reply;
2245 struct drbd_nl_cfg_reply *reply;
2246 struct drbd_conf *mdev;
1aba4d7f 2247 struct drbd_tconn *tconn;
b411b363
PR
2248 int retcode, rr;
2249 int reply_size = sizeof(struct cn_msg)
2250 + sizeof(struct drbd_nl_cfg_reply)
2251 + sizeof(short int);
2252
2253 if (!try_module_get(THIS_MODULE)) {
2254 printk(KERN_ERR "drbd: try_module_get() failed!\n");
2255 return;
2256 }
2257
01a16b21 2258 if (!cap_raised(current_cap(), CAP_SYS_ADMIN)) {
9f5180e5
PR
2259 retcode = ERR_PERM;
2260 goto fail;
2261 }
2262
42ff269d
LE
2263 if (nlp->packet_type >= P_nl_after_last_packet ||
2264 nlp->packet_type == P_return_code_only) {
b411b363
PR
2265 retcode = ERR_PACKET_NR;
2266 goto fail;
2267 }
2268
2269 cm = cnd_table + nlp->packet_type;
2270
2271 /* This may happen if packet number is 0: */
1aba4d7f 2272 if (cm->minor_based == NULL) {
b411b363
PR
2273 retcode = ERR_PACKET_NR;
2274 goto fail;
2275 }
2276
2277 reply_size += cm->reply_body_size;
2278
2279 /* allocation not in the IO path, cqueue thread context */
3e3a7766 2280 cn_reply = kzalloc(reply_size, GFP_KERNEL);
b411b363
PR
2281 if (!cn_reply) {
2282 retcode = ERR_NOMEM;
2283 goto fail;
2284 }
2285 reply = (struct drbd_nl_cfg_reply *) cn_reply->data;
2286
2287 reply->packet_type =
42ff269d 2288 cm->reply_body_size ? nlp->packet_type : P_return_code_only;
b411b363
PR
2289 reply->minor = nlp->drbd_minor;
2290 reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */
2291 /* reply->tag_list; might be modified by cm->function. */
2292
1aba4d7f
PR
2293 retcode = ERR_MINOR_INVALID;
2294 rr = 0;
2295 switch (cm->type) {
2296 case CHT_MINOR:
2297 mdev = minor_to_mdev(nlp->drbd_minor);
2298 if (!mdev)
2299 goto fail;
2300 rr = cm->minor_based(mdev, nlp, reply);
2301 break;
2302 case CHT_CONN:
2303 tconn = conn_by_name(nlp->obj_name);
2304 if (!tconn) {
2305 retcode = ERR_CONN_NOT_KNOWN;
2306 goto fail;
2307 }
2308 rr = cm->conn_based(tconn, nlp, reply);
2309 break;
2310 case CHT_CTOR:
2311 rr = cm->constructor(nlp, reply);
2312 break;
2313 /* case CHT_RES: */
2314 }
b411b363
PR
2315
2316 cn_reply->id = req->id;
2317 cn_reply->seq = req->seq;
2318 cn_reply->ack = req->ack + 1;
2319 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + rr;
2320 cn_reply->flags = 0;
2321
b411b363
PR
2322 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL);
2323 if (rr && rr != -ESRCH)
2324 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2325
2326 kfree(cn_reply);
2327 module_put(THIS_MODULE);
2328 return;
2329 fail:
2330 drbd_nl_send_reply(req, retcode);
2331 module_put(THIS_MODULE);
2332}
2333
2334static atomic_t drbd_nl_seq = ATOMIC_INIT(2); /* two. */
2335
2336static unsigned short *
2337__tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data,
2338 unsigned short len, int nul_terminated)
2339{
2340 unsigned short l = tag_descriptions[tag_number(tag)].max_len;
2341 len = (len < l) ? len : l;
2342 put_unaligned(tag, tl++);
2343 put_unaligned(len, tl++);
2344 memcpy(tl, data, len);
2345 tl = (unsigned short*)((char*)tl + len);
2346 if (nul_terminated)
2347 *((char*)tl - 1) = 0;
2348 return tl;
2349}
2350
2351static unsigned short *
2352tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, int len)
2353{
2354 return __tl_add_blob(tl, tag, data, len, 0);
2355}
2356
2357static unsigned short *
2358tl_add_str(unsigned short *tl, enum drbd_tags tag, const char *str)
2359{
2360 return __tl_add_blob(tl, tag, str, strlen(str)+1, 0);
2361}
2362
2363static unsigned short *
2364tl_add_int(unsigned short *tl, enum drbd_tags tag, const void *val)
2365{
2366 put_unaligned(tag, tl++);
2367 switch(tag_type(tag)) {
2368 case TT_INTEGER:
2369 put_unaligned(sizeof(int), tl++);
2370 put_unaligned(*(int *)val, (int *)tl);
2371 tl = (unsigned short*)((char*)tl+sizeof(int));
2372 break;
2373 case TT_INT64:
2374 put_unaligned(sizeof(u64), tl++);
2375 put_unaligned(*(u64 *)val, (u64 *)tl);
2376 tl = (unsigned short*)((char*)tl+sizeof(u64));
2377 break;
2378 default:
2379 /* someone did something stupid. */
2380 ;
2381 }
2382 return tl;
2383}
2384
2385void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state state)
2386{
2387 char buffer[sizeof(struct cn_msg)+
2388 sizeof(struct drbd_nl_cfg_reply)+
2389 sizeof(struct get_state_tag_len_struct)+
2390 sizeof(short int)];
2391 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2392 struct drbd_nl_cfg_reply *reply =
2393 (struct drbd_nl_cfg_reply *)cn_reply->data;
2394 unsigned short *tl = reply->tag_list;
2395
2396 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2397
3f9cbe93 2398 tl = get_state_to_tags((struct get_state *)&state, tl);
b411b363
PR
2399
2400 put_unaligned(TT_END, tl++); /* Close the tag list */
2401
2402 cn_reply->id.idx = CN_IDX_DRBD;
2403 cn_reply->id.val = CN_VAL_DRBD;
2404
8ccf218e 2405 cn_reply->seq = atomic_inc_return(&drbd_nl_seq);
b411b363
PR
2406 cn_reply->ack = 0; /* not used here. */
2407 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2408 (int)((char *)tl - (char *)reply->tag_list);
2409 cn_reply->flags = 0;
2410
2411 reply->packet_type = P_get_state;
2412 reply->minor = mdev_to_minor(mdev);
2413 reply->ret_code = NO_ERROR;
2414
b411b363
PR
2415 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2416}
2417
2418void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name)
2419{
2420 char buffer[sizeof(struct cn_msg)+
2421 sizeof(struct drbd_nl_cfg_reply)+
2422 sizeof(struct call_helper_tag_len_struct)+
2423 sizeof(short int)];
2424 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2425 struct drbd_nl_cfg_reply *reply =
2426 (struct drbd_nl_cfg_reply *)cn_reply->data;
2427 unsigned short *tl = reply->tag_list;
2428
2429 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2430
2431 tl = tl_add_str(tl, T_helper, helper_name);
2432 put_unaligned(TT_END, tl++); /* Close the tag list */
2433
2434 cn_reply->id.idx = CN_IDX_DRBD;
2435 cn_reply->id.val = CN_VAL_DRBD;
2436
8ccf218e 2437 cn_reply->seq = atomic_inc_return(&drbd_nl_seq);
b411b363
PR
2438 cn_reply->ack = 0; /* not used here. */
2439 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2440 (int)((char *)tl - (char *)reply->tag_list);
2441 cn_reply->flags = 0;
2442
2443 reply->packet_type = P_call_helper;
2444 reply->minor = mdev_to_minor(mdev);
2445 reply->ret_code = NO_ERROR;
2446
b411b363
PR
2447 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2448}
2449
f6ffca9f
AG
2450void drbd_bcast_ee(struct drbd_conf *mdev, const char *reason, const int dgs,
2451 const char *seen_hash, const char *calc_hash,
db830c46 2452 const struct drbd_peer_request *peer_req)
b411b363
PR
2453{
2454 struct cn_msg *cn_reply;
2455 struct drbd_nl_cfg_reply *reply;
b411b363 2456 unsigned short *tl;
45bb912b
LE
2457 struct page *page;
2458 unsigned len;
b411b363 2459
db830c46 2460 if (!peer_req)
b411b363
PR
2461 return;
2462 if (!reason || !reason[0])
2463 return;
2464
2465 /* apparently we have to memcpy twice, first to prepare the data for the
2466 * struct cn_msg, then within cn_netlink_send from the cn_msg to the
2467 * netlink skb. */
2468 /* receiver thread context, which is not in the writeout path (of this node),
2469 * but may be in the writeout path of the _other_ node.
2470 * GFP_NOIO to avoid potential "distributed deadlock". */
3e3a7766 2471 cn_reply = kzalloc(
b411b363
PR
2472 sizeof(struct cn_msg)+
2473 sizeof(struct drbd_nl_cfg_reply)+
2474 sizeof(struct dump_ee_tag_len_struct)+
2475 sizeof(short int),
2476 GFP_NOIO);
2477
2478 if (!cn_reply) {
db830c46
AG
2479 dev_err(DEV, "could not kmalloc buffer for drbd_bcast_ee, "
2480 "sector %llu, size %u\n",
2481 (unsigned long long)peer_req->i.sector,
2482 peer_req->i.size);
b411b363
PR
2483 return;
2484 }
2485
2486 reply = (struct drbd_nl_cfg_reply*)cn_reply->data;
2487 tl = reply->tag_list;
2488
2489 tl = tl_add_str(tl, T_dump_ee_reason, reason);
2490 tl = tl_add_blob(tl, T_seen_digest, seen_hash, dgs);
2491 tl = tl_add_blob(tl, T_calc_digest, calc_hash, dgs);
db830c46
AG
2492 tl = tl_add_int(tl, T_ee_sector, &peer_req->i.sector);
2493 tl = tl_add_int(tl, T_ee_block_id, &peer_req->block_id);
b411b363 2494
3129b1b9 2495 /* dump the first 32k */
db830c46 2496 len = min_t(unsigned, peer_req->i.size, 32 << 10);
b411b363 2497 put_unaligned(T_ee_data, tl++);
3129b1b9 2498 put_unaligned(len, tl++);
b411b363 2499
db830c46 2500 page = peer_req->pages;
45bb912b
LE
2501 page_chain_for_each(page) {
2502 void *d = kmap_atomic(page, KM_USER0);
2503 unsigned l = min_t(unsigned, len, PAGE_SIZE);
2504 memcpy(tl, d, l);
2505 kunmap_atomic(d, KM_USER0);
2506 tl = (unsigned short*)((char*)tl + l);
2507 len -= l;
3129b1b9
LE
2508 if (len == 0)
2509 break;
b411b363
PR
2510 }
2511 put_unaligned(TT_END, tl++); /* Close the tag list */
2512
2513 cn_reply->id.idx = CN_IDX_DRBD;
2514 cn_reply->id.val = CN_VAL_DRBD;
2515
8ccf218e 2516 cn_reply->seq = atomic_inc_return(&drbd_nl_seq);
b411b363
PR
2517 cn_reply->ack = 0; // not used here.
2518 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2519 (int)((char*)tl - (char*)reply->tag_list);
2520 cn_reply->flags = 0;
2521
2522 reply->packet_type = P_dump_ee;
2523 reply->minor = mdev_to_minor(mdev);
2524 reply->ret_code = NO_ERROR;
2525
b411b363
PR
2526 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2527 kfree(cn_reply);
2528}
2529
2530void drbd_bcast_sync_progress(struct drbd_conf *mdev)
2531{
2532 char buffer[sizeof(struct cn_msg)+
2533 sizeof(struct drbd_nl_cfg_reply)+
2534 sizeof(struct sync_progress_tag_len_struct)+
2535 sizeof(short int)];
2536 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2537 struct drbd_nl_cfg_reply *reply =
2538 (struct drbd_nl_cfg_reply *)cn_reply->data;
2539 unsigned short *tl = reply->tag_list;
2540 unsigned long rs_left;
2541 unsigned int res;
2542
2543 /* no local ref, no bitmap, no syncer progress, no broadcast. */
2544 if (!get_ldev(mdev))
2545 return;
2546 drbd_get_syncer_progress(mdev, &rs_left, &res);
2547 put_ldev(mdev);
2548
2549 tl = tl_add_int(tl, T_sync_progress, &res);
2550 put_unaligned(TT_END, tl++); /* Close the tag list */
2551
2552 cn_reply->id.idx = CN_IDX_DRBD;
2553 cn_reply->id.val = CN_VAL_DRBD;
2554
8ccf218e 2555 cn_reply->seq = atomic_inc_return(&drbd_nl_seq);
b411b363
PR
2556 cn_reply->ack = 0; /* not used here. */
2557 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2558 (int)((char *)tl - (char *)reply->tag_list);
2559 cn_reply->flags = 0;
2560
2561 reply->packet_type = P_sync_progress;
2562 reply->minor = mdev_to_minor(mdev);
2563 reply->ret_code = NO_ERROR;
2564
b411b363
PR
2565 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2566}
2567
2568int __init drbd_nl_init(void)
2569{
2570 static struct cb_id cn_id_drbd;
2571 int err, try=10;
2572
2573 cn_id_drbd.val = CN_VAL_DRBD;
2574 do {
2575 cn_id_drbd.idx = cn_idx;
2576 err = cn_add_callback(&cn_id_drbd, "cn_drbd", &drbd_connector_callback);
2577 if (!err)
2578 break;
2579 cn_idx = (cn_idx + CN_IDX_STEP);
2580 } while (try--);
2581
2582 if (err) {
2583 printk(KERN_ERR "drbd: cn_drbd failed to register\n");
2584 return err;
2585 }
2586
2587 return 0;
2588}
2589
2590void drbd_nl_cleanup(void)
2591{
2592 static struct cb_id cn_id_drbd;
2593
2594 cn_id_drbd.idx = cn_idx;
2595 cn_id_drbd.val = CN_VAL_DRBD;
2596
2597 cn_del_callback(&cn_id_drbd);
2598}
2599
2600void drbd_nl_send_reply(struct cn_msg *req, int ret_code)
2601{
2602 char buffer[sizeof(struct cn_msg)+sizeof(struct drbd_nl_cfg_reply)];
2603 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2604 struct drbd_nl_cfg_reply *reply =
2605 (struct drbd_nl_cfg_reply *)cn_reply->data;
2606 int rr;
2607
3e3a7766 2608 memset(buffer, 0, sizeof(buffer));
b411b363
PR
2609 cn_reply->id = req->id;
2610
2611 cn_reply->seq = req->seq;
2612 cn_reply->ack = req->ack + 1;
2613 cn_reply->len = sizeof(struct drbd_nl_cfg_reply);
2614 cn_reply->flags = 0;
2615
42ff269d 2616 reply->packet_type = P_return_code_only;
b411b363
PR
2617 reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor;
2618 reply->ret_code = ret_code;
2619
b411b363
PR
2620 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2621 if (rr && rr != -ESRCH)
2622 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2623}
2624