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FRV: Use generic show_interrupts()
[cris-mirror.git] / drivers / block / drbd / drbd_nl.c
blobfe81c851ca8800fdce14bccc3c7be032b7263669
1 /*
2 drbd_nl.c
3
4 This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
5
6 Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
7 Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
8 Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
9
10 drbd is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2, or (at your option)
13 any later version.
14
15 drbd is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with drbd; see the file COPYING. If not, write to
22 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
23
24 */
25
26 #include <linux/module.h>
27 #include <linux/drbd.h>
28 #include <linux/in.h>
29 #include <linux/fs.h>
30 #include <linux/file.h>
31 #include <linux/slab.h>
32 #include <linux/connector.h>
33 #include <linux/blkpg.h>
34 #include <linux/cpumask.h>
35 #include "drbd_int.h"
36 #include "drbd_req.h"
37 #include "drbd_wrappers.h"
38 #include <asm/unaligned.h>
39 #include <linux/drbd_tag_magic.h>
40 #include <linux/drbd_limits.h>
41 #include <linux/compiler.h>
42 #include <linux/kthread.h>
43
44 static unsigned short *tl_add_blob(unsigned short *, enum drbd_tags, const void *, int);
45 static unsigned short *tl_add_str(unsigned short *, enum drbd_tags, const char *);
46 static unsigned short *tl_add_int(unsigned short *, enum drbd_tags, const void *);
47
48 /* see get_sb_bdev and bd_claim */
49 static char *drbd_m_holder = "Hands off! this is DRBD's meta data device.";
50
51 /* Generate the tag_list to struct functions */
52 #define NL_PACKET(name, number, fields) \
53 static int name ## _from_tags(struct drbd_conf *mdev, \
54 unsigned short *tags, struct name *arg) __attribute__ ((unused)); \
55 static int name ## _from_tags(struct drbd_conf *mdev, \
56 unsigned short *tags, struct name *arg) \
57 { \
58 int tag; \
59 int dlen; \
60 \
61 while ((tag = get_unaligned(tags++)) != TT_END) { \
62 dlen = get_unaligned(tags++); \
63 switch (tag_number(tag)) { \
64 fields \
65 default: \
66 if (tag & T_MANDATORY) { \
67 dev_err(DEV, "Unknown tag: %d\n", tag_number(tag)); \
68 return 0; \
69 } \
70 } \
71 tags = (unsigned short *)((char *)tags + dlen); \
72 } \
73 return 1; \
74 }
75 #define NL_INTEGER(pn, pr, member) \
76 case pn: /* D_ASSERT( tag_type(tag) == TT_INTEGER ); */ \
77 arg->member = get_unaligned((int *)(tags)); \
78 break;
79 #define NL_INT64(pn, pr, member) \
80 case pn: /* D_ASSERT( tag_type(tag) == TT_INT64 ); */ \
81 arg->member = get_unaligned((u64 *)(tags)); \
82 break;
83 #define NL_BIT(pn, pr, member) \
84 case pn: /* D_ASSERT( tag_type(tag) == TT_BIT ); */ \
85 arg->member = *(char *)(tags) ? 1 : 0; \
86 break;
87 #define NL_STRING(pn, pr, member, len) \
88 case pn: /* D_ASSERT( tag_type(tag) == TT_STRING ); */ \
89 if (dlen > len) { \
90 dev_err(DEV, "arg too long: %s (%u wanted, max len: %u bytes)\n", \
91 #member, dlen, (unsigned int)len); \
92 return 0; \
93 } \
94 arg->member ## _len = dlen; \
95 memcpy(arg->member, tags, min_t(size_t, dlen, len)); \
96 break;
97 #include "linux/drbd_nl.h"
98
99 /* Generate the struct to tag_list functions */
100 #define NL_PACKET(name, number, fields) \
101 static unsigned short* \
102 name ## _to_tags(struct drbd_conf *mdev, \
103 struct name *arg, unsigned short *tags) __attribute__ ((unused)); \
104 static unsigned short* \
105 name ## _to_tags(struct drbd_conf *mdev, \
106 struct name *arg, unsigned short *tags) \
107 { \
108 fields \
109 return tags; \
110 }
111
112 #define NL_INTEGER(pn, pr, member) \
113 put_unaligned(pn | pr | TT_INTEGER, tags++); \
114 put_unaligned(sizeof(int), tags++); \
115 put_unaligned(arg->member, (int *)tags); \
116 tags = (unsigned short *)((char *)tags+sizeof(int));
117 #define NL_INT64(pn, pr, member) \
118 put_unaligned(pn | pr | TT_INT64, tags++); \
119 put_unaligned(sizeof(u64), tags++); \
120 put_unaligned(arg->member, (u64 *)tags); \
121 tags = (unsigned short *)((char *)tags+sizeof(u64));
122 #define NL_BIT(pn, pr, member) \
123 put_unaligned(pn | pr | TT_BIT, tags++); \
124 put_unaligned(sizeof(char), tags++); \
125 *(char *)tags = arg->member; \
126 tags = (unsigned short *)((char *)tags+sizeof(char));
127 #define NL_STRING(pn, pr, member, len) \
128 put_unaligned(pn | pr | TT_STRING, tags++); \
129 put_unaligned(arg->member ## _len, tags++); \
130 memcpy(tags, arg->member, arg->member ## _len); \
131 tags = (unsigned short *)((char *)tags + arg->member ## _len);
132 #include "linux/drbd_nl.h"
133
134 void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name);
135 void drbd_nl_send_reply(struct cn_msg *, int);
136
137 int drbd_khelper(struct drbd_conf *mdev, char *cmd)
138 {
139 char *envp[] = { "HOME=/",
140 "TERM=linux",
141 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
142 NULL, /* Will be set to address family */
143 NULL, /* Will be set to address */
144 NULL };
145
146 char mb[12], af[20], ad[60], *afs;
147 char *argv[] = {usermode_helper, cmd, mb, NULL };
148 int ret;
149
150 snprintf(mb, 12, "minor-%d", mdev_to_minor(mdev));
151
152 if (get_net_conf(mdev)) {
153 switch (((struct sockaddr *)mdev->net_conf->peer_addr)->sa_family) {
154 case AF_INET6:
155 afs = "ipv6";
156 snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI6",
157 &((struct sockaddr_in6 *)mdev->net_conf->peer_addr)->sin6_addr);
158 break;
159 case AF_INET:
160 afs = "ipv4";
161 snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4",
162 &((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr);
163 break;
164 default:
165 afs = "ssocks";
166 snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4",
167 &((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr);
168 }
169 snprintf(af, 20, "DRBD_PEER_AF=%s", afs);
170 envp[3]=af;
171 envp[4]=ad;
172 put_net_conf(mdev);
173 }
174
175 /* The helper may take some time.
176 * write out any unsynced meta data changes now */
177 drbd_md_sync(mdev);
178
179 dev_info(DEV, "helper command: %s %s %s\n", usermode_helper, cmd, mb);
180
181 drbd_bcast_ev_helper(mdev, cmd);
182 ret = call_usermodehelper(usermode_helper, argv, envp, 1);
183 if (ret)
184 dev_warn(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
185 usermode_helper, cmd, mb,
186 (ret >> 8) & 0xff, ret);
187 else
188 dev_info(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
189 usermode_helper, cmd, mb,
190 (ret >> 8) & 0xff, ret);
191
192 if (ret < 0) /* Ignore any ERRNOs we got. */
193 ret = 0;
194
195 return ret;
196 }
197
198 enum drbd_disk_state drbd_try_outdate_peer(struct drbd_conf *mdev)
199 {
200 char *ex_to_string;
201 int r;
202 enum drbd_disk_state nps;
203 enum drbd_fencing_p fp;
204
205 D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
206
207 if (get_ldev_if_state(mdev, D_CONSISTENT)) {
208 fp = mdev->ldev->dc.fencing;
209 put_ldev(mdev);
210 } else {
211 dev_warn(DEV, "Not fencing peer, I'm not even Consistent myself.\n");
212 nps = mdev->state.pdsk;
213 goto out;
214 }
215
216 r = drbd_khelper(mdev, "fence-peer");
217
218 switch ((r>>8) & 0xff) {
219 case 3: /* peer is inconsistent */
220 ex_to_string = "peer is inconsistent or worse";
221 nps = D_INCONSISTENT;
222 break;
223 case 4: /* peer got outdated, or was already outdated */
224 ex_to_string = "peer was fenced";
225 nps = D_OUTDATED;
226 break;
227 case 5: /* peer was down */
228 if (mdev->state.disk == D_UP_TO_DATE) {
229 /* we will(have) create(d) a new UUID anyways... */
230 ex_to_string = "peer is unreachable, assumed to be dead";
231 nps = D_OUTDATED;
232 } else {
233 ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
234 nps = mdev->state.pdsk;
235 }
236 break;
237 case 6: /* Peer is primary, voluntarily outdate myself.
238 * This is useful when an unconnected R_SECONDARY is asked to
239 * become R_PRIMARY, but finds the other peer being active. */
240 ex_to_string = "peer is active";
241 dev_warn(DEV, "Peer is primary, outdating myself.\n");
242 nps = D_UNKNOWN;
243 _drbd_request_state(mdev, NS(disk, D_OUTDATED), CS_WAIT_COMPLETE);
244 break;
245 case 7:
246 if (fp != FP_STONITH)
247 dev_err(DEV, "fence-peer() = 7 && fencing != Stonith !!!\n");
248 ex_to_string = "peer was stonithed";
249 nps = D_OUTDATED;
250 break;
251 default:
252 /* The script is broken ... */
253 nps = D_UNKNOWN;
254 dev_err(DEV, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
255 return nps;
256 }
257
258 dev_info(DEV, "fence-peer helper returned %d (%s)\n",
259 (r>>8) & 0xff, ex_to_string);
260
261 out:
262 if (mdev->state.susp_fen && nps >= D_UNKNOWN) {
263 /* The handler was not successful... unfreeze here, the
264 state engine can not unfreeze... */
265 _drbd_request_state(mdev, NS(susp_fen, 0), CS_VERBOSE);
266 }
267
268 return nps;
269 }
270
271 static int _try_outdate_peer_async(void *data)
272 {
273 struct drbd_conf *mdev = (struct drbd_conf *)data;
274 enum drbd_disk_state nps;
275
276 nps = drbd_try_outdate_peer(mdev);
277 drbd_request_state(mdev, NS(pdsk, nps));
278
279 return 0;
280 }
281
282 void drbd_try_outdate_peer_async(struct drbd_conf *mdev)
283 {
284 struct task_struct *opa;
285
286 opa = kthread_run(_try_outdate_peer_async, mdev, "drbd%d_a_helper", mdev_to_minor(mdev));
287 if (IS_ERR(opa))
288 dev_err(DEV, "out of mem, failed to invoke fence-peer helper\n");
289 }
290
291 int drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
292 {
293 const int max_tries = 4;
294 int r = 0;
295 int try = 0;
296 int forced = 0;
297 union drbd_state mask, val;
298 enum drbd_disk_state nps;
299
300 if (new_role == R_PRIMARY)
301 request_ping(mdev); /* Detect a dead peer ASAP */
302
303 mutex_lock(&mdev->state_mutex);
304
305 mask.i = 0; mask.role = R_MASK;
306 val.i = 0; val.role = new_role;
307
308 while (try++ < max_tries) {
309 r = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE);
310
311 /* in case we first succeeded to outdate,
312 * but now suddenly could establish a connection */
313 if (r == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
314 val.pdsk = 0;
315 mask.pdsk = 0;
316 continue;
317 }
318
319 if (r == SS_NO_UP_TO_DATE_DISK && force &&
320 (mdev->state.disk < D_UP_TO_DATE &&
321 mdev->state.disk >= D_INCONSISTENT)) {
322 mask.disk = D_MASK;
323 val.disk = D_UP_TO_DATE;
324 forced = 1;
325 continue;
326 }
327
328 if (r == SS_NO_UP_TO_DATE_DISK &&
329 mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) {
330 D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
331 nps = drbd_try_outdate_peer(mdev);
332
333 if (nps == D_OUTDATED || nps == D_INCONSISTENT) {
334 val.disk = D_UP_TO_DATE;
335 mask.disk = D_MASK;
336 }
337
338 val.pdsk = nps;
339 mask.pdsk = D_MASK;
340
341 continue;
342 }
343
344 if (r == SS_NOTHING_TO_DO)
345 goto fail;
346 if (r == SS_PRIMARY_NOP && mask.pdsk == 0) {
347 nps = drbd_try_outdate_peer(mdev);
348
349 if (force && nps > D_OUTDATED) {
350 dev_warn(DEV, "Forced into split brain situation!\n");
351 nps = D_OUTDATED;
352 }
353
354 mask.pdsk = D_MASK;
355 val.pdsk = nps;
356
357 continue;
358 }
359 if (r == SS_TWO_PRIMARIES) {
360 /* Maybe the peer is detected as dead very soon...
361 retry at most once more in this case. */
362 __set_current_state(TASK_INTERRUPTIBLE);
363 schedule_timeout((mdev->net_conf->ping_timeo+1)*HZ/10);
364 if (try < max_tries)
365 try = max_tries - 1;
366 continue;
367 }
368 if (r < SS_SUCCESS) {
369 r = _drbd_request_state(mdev, mask, val,
370 CS_VERBOSE + CS_WAIT_COMPLETE);
371 if (r < SS_SUCCESS)
372 goto fail;
373 }
374 break;
375 }
376
377 if (r < SS_SUCCESS)
378 goto fail;
379
380 if (forced)
381 dev_warn(DEV, "Forced to consider local data as UpToDate!\n");
382
383 /* Wait until nothing is on the fly :) */
384 wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0);
385
386 if (new_role == R_SECONDARY) {
387 set_disk_ro(mdev->vdisk, TRUE);
388 if (get_ldev(mdev)) {
389 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
390 put_ldev(mdev);
391 }
392 } else {
393 if (get_net_conf(mdev)) {
394 mdev->net_conf->want_lose = 0;
395 put_net_conf(mdev);
396 }
397 set_disk_ro(mdev->vdisk, FALSE);
398 if (get_ldev(mdev)) {
399 if (((mdev->state.conn < C_CONNECTED ||
400 mdev->state.pdsk <= D_FAILED)
401 && mdev->ldev->md.uuid[UI_BITMAP] == 0) || forced)
402 drbd_uuid_new_current(mdev);
403
404 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
405 put_ldev(mdev);
406 }
407 }
408
409 if ((new_role == R_SECONDARY) && get_ldev(mdev)) {
410 drbd_al_to_on_disk_bm(mdev);
411 put_ldev(mdev);
412 }
413
414 if (mdev->state.conn >= C_WF_REPORT_PARAMS) {
415 /* if this was forced, we should consider sync */
416 if (forced)
417 drbd_send_uuids(mdev);
418 drbd_send_state(mdev);
419 }
420
421 drbd_md_sync(mdev);
422
423 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
424 fail:
425 mutex_unlock(&mdev->state_mutex);
426 return r;
427 }
428
429 static struct drbd_conf *ensure_mdev(int minor, int create)
430 {
431 struct drbd_conf *mdev;
432
433 if (minor >= minor_count)
434 return NULL;
435
436 mdev = minor_to_mdev(minor);
437
438 if (!mdev && create) {
439 struct gendisk *disk = NULL;
440 mdev = drbd_new_device(minor);
441
442 spin_lock_irq(&drbd_pp_lock);
443 if (minor_table[minor] == NULL) {
444 minor_table[minor] = mdev;
445 disk = mdev->vdisk;
446 mdev = NULL;
447 } /* else: we lost the race */
448 spin_unlock_irq(&drbd_pp_lock);
449
450 if (disk) /* we won the race above */
451 /* in case we ever add a drbd_delete_device(),
452 * don't forget the del_gendisk! */
453 add_disk(disk);
454 else /* we lost the race above */
455 drbd_free_mdev(mdev);
456
457 mdev = minor_to_mdev(minor);
458 }
459
460 return mdev;
461 }
462
463 static int drbd_nl_primary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
464 struct drbd_nl_cfg_reply *reply)
465 {
466 struct primary primary_args;
467
468 memset(&primary_args, 0, sizeof(struct primary));
469 if (!primary_from_tags(mdev, nlp->tag_list, &primary_args)) {
470 reply->ret_code = ERR_MANDATORY_TAG;
471 return 0;
472 }
473
474 reply->ret_code =
475 drbd_set_role(mdev, R_PRIMARY, primary_args.primary_force);
476
477 return 0;
478 }
479
480 static int drbd_nl_secondary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
481 struct drbd_nl_cfg_reply *reply)
482 {
483 reply->ret_code = drbd_set_role(mdev, R_SECONDARY, 0);
484
485 return 0;
486 }
487
488 /* initializes the md.*_offset members, so we are able to find
489 * the on disk meta data */
490 static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
491 struct drbd_backing_dev *bdev)
492 {
493 sector_t md_size_sect = 0;
494 switch (bdev->dc.meta_dev_idx) {
495 default:
496 /* v07 style fixed size indexed meta data */
497 bdev->md.md_size_sect = MD_RESERVED_SECT;
498 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
499 bdev->md.al_offset = MD_AL_OFFSET;
500 bdev->md.bm_offset = MD_BM_OFFSET;
501 break;
502 case DRBD_MD_INDEX_FLEX_EXT:
503 /* just occupy the full device; unit: sectors */
504 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
505 bdev->md.md_offset = 0;
506 bdev->md.al_offset = MD_AL_OFFSET;
507 bdev->md.bm_offset = MD_BM_OFFSET;
508 break;
509 case DRBD_MD_INDEX_INTERNAL:
510 case DRBD_MD_INDEX_FLEX_INT:
511 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
512 /* al size is still fixed */
513 bdev->md.al_offset = -MD_AL_MAX_SIZE;
514 /* we need (slightly less than) ~ this much bitmap sectors: */
515 md_size_sect = drbd_get_capacity(bdev->backing_bdev);
516 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
517 md_size_sect = BM_SECT_TO_EXT(md_size_sect);
518 md_size_sect = ALIGN(md_size_sect, 8);
519
520 /* plus the "drbd meta data super block",
521 * and the activity log; */
522 md_size_sect += MD_BM_OFFSET;
523
524 bdev->md.md_size_sect = md_size_sect;
525 /* bitmap offset is adjusted by 'super' block size */
526 bdev->md.bm_offset = -md_size_sect + MD_AL_OFFSET;
527 break;
528 }
529 }
530
531 char *ppsize(char *buf, unsigned long long size)
532 {
533 /* Needs 9 bytes at max. */
534 static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
535 int base = 0;
536 while (size >= 10000) {
537 /* shift + round */
538 size = (size >> 10) + !!(size & (1<<9));
539 base++;
540 }
541 sprintf(buf, "%lu %cB", (long)size, units[base]);
542
543 return buf;
544 }
545
546 /* there is still a theoretical deadlock when called from receiver
547 * on an D_INCONSISTENT R_PRIMARY:
548 * remote READ does inc_ap_bio, receiver would need to receive answer
549 * packet from remote to dec_ap_bio again.
550 * receiver receive_sizes(), comes here,
551 * waits for ap_bio_cnt == 0. -> deadlock.
552 * but this cannot happen, actually, because:
553 * R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable
554 * (not connected, or bad/no disk on peer):
555 * see drbd_fail_request_early, ap_bio_cnt is zero.
556 * R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET:
557 * peer may not initiate a resize.
558 */
559 void drbd_suspend_io(struct drbd_conf *mdev)
560 {
561 set_bit(SUSPEND_IO, &mdev->flags);
562 if (is_susp(mdev->state))
563 return;
564 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
565 }
566
567 void drbd_resume_io(struct drbd_conf *mdev)
568 {
569 clear_bit(SUSPEND_IO, &mdev->flags);
570 wake_up(&mdev->misc_wait);
571 }
572
573 /**
574 * drbd_determine_dev_size() - Sets the right device size obeying all constraints
575 * @mdev: DRBD device.
576 *
577 * Returns 0 on success, negative return values indicate errors.
578 * You should call drbd_md_sync() after calling this function.
579 */
580 enum determine_dev_size drbd_determin_dev_size(struct drbd_conf *mdev, enum dds_flags flags) __must_hold(local)
581 {
582 sector_t prev_first_sect, prev_size; /* previous meta location */
583 sector_t la_size;
584 sector_t size;
585 char ppb[10];
586
587 int md_moved, la_size_changed;
588 enum determine_dev_size rv = unchanged;
589
590 /* race:
591 * application request passes inc_ap_bio,
592 * but then cannot get an AL-reference.
593 * this function later may wait on ap_bio_cnt == 0. -> deadlock.
594 *
595 * to avoid that:
596 * Suspend IO right here.
597 * still lock the act_log to not trigger ASSERTs there.
598 */
599 drbd_suspend_io(mdev);
600
601 /* no wait necessary anymore, actually we could assert that */
602 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
603
604 prev_first_sect = drbd_md_first_sector(mdev->ldev);
605 prev_size = mdev->ldev->md.md_size_sect;
606 la_size = mdev->ldev->md.la_size_sect;
607
608 /* TODO: should only be some assert here, not (re)init... */
609 drbd_md_set_sector_offsets(mdev, mdev->ldev);
610
611 size = drbd_new_dev_size(mdev, mdev->ldev, flags & DDSF_FORCED);
612
613 if (drbd_get_capacity(mdev->this_bdev) != size ||
614 drbd_bm_capacity(mdev) != size) {
615 int err;
616 err = drbd_bm_resize(mdev, size, !(flags & DDSF_NO_RESYNC));
617 if (unlikely(err)) {
618 /* currently there is only one error: ENOMEM! */
619 size = drbd_bm_capacity(mdev)>>1;
620 if (size == 0) {
621 dev_err(DEV, "OUT OF MEMORY! "
622 "Could not allocate bitmap!\n");
623 } else {
624 dev_err(DEV, "BM resizing failed. "
625 "Leaving size unchanged at size = %lu KB\n",
626 (unsigned long)size);
627 }
628 rv = dev_size_error;
629 }
630 /* racy, see comments above. */
631 drbd_set_my_capacity(mdev, size);
632 mdev->ldev->md.la_size_sect = size;
633 dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1),
634 (unsigned long long)size>>1);
635 }
636 if (rv == dev_size_error)
637 goto out;
638
639 la_size_changed = (la_size != mdev->ldev->md.la_size_sect);
640
641 md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev)
642 || prev_size != mdev->ldev->md.md_size_sect;
643
644 if (la_size_changed || md_moved) {
645 drbd_al_shrink(mdev); /* All extents inactive. */
646 dev_info(DEV, "Writing the whole bitmap, %s\n",
647 la_size_changed && md_moved ? "size changed and md moved" :
648 la_size_changed ? "size changed" : "md moved");
649 rv = drbd_bitmap_io(mdev, &drbd_bm_write, "size changed"); /* does drbd_resume_io() ! */
650 drbd_md_mark_dirty(mdev);
651 }
652
653 if (size > la_size)
654 rv = grew;
655 if (size < la_size)
656 rv = shrunk;
657 out:
658 lc_unlock(mdev->act_log);
659 wake_up(&mdev->al_wait);
660 drbd_resume_io(mdev);
661
662 return rv;
663 }
664
665 sector_t
666 drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev, int assume_peer_has_space)
667 {
668 sector_t p_size = mdev->p_size; /* partner's disk size. */
669 sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */
670 sector_t m_size; /* my size */
671 sector_t u_size = bdev->dc.disk_size; /* size requested by user. */
672 sector_t size = 0;
673
674 m_size = drbd_get_max_capacity(bdev);
675
676 if (mdev->state.conn < C_CONNECTED && assume_peer_has_space) {
677 dev_warn(DEV, "Resize while not connected was forced by the user!\n");
678 p_size = m_size;
679 }
680
681 if (p_size && m_size) {
682 size = min_t(sector_t, p_size, m_size);
683 } else {
684 if (la_size) {
685 size = la_size;
686 if (m_size && m_size < size)
687 size = m_size;
688 if (p_size && p_size < size)
689 size = p_size;
690 } else {
691 if (m_size)
692 size = m_size;
693 if (p_size)
694 size = p_size;
695 }
696 }
697
698 if (size == 0)
699 dev_err(DEV, "Both nodes diskless!\n");
700
701 if (u_size) {
702 if (u_size > size)
703 dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n",
704 (unsigned long)u_size>>1, (unsigned long)size>>1);
705 else
706 size = u_size;
707 }
708
709 return size;
710 }
711
712 /**
713 * drbd_check_al_size() - Ensures that the AL is of the right size
714 * @mdev: DRBD device.
715 *
716 * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
717 * failed, and 0 on success. You should call drbd_md_sync() after you called
718 * this function.
719 */
720 static int drbd_check_al_size(struct drbd_conf *mdev)
721 {
722 struct lru_cache *n, *t;
723 struct lc_element *e;
724 unsigned int in_use;
725 int i;
726
727 ERR_IF(mdev->sync_conf.al_extents < 7)
728 mdev->sync_conf.al_extents = 127;
729
730 if (mdev->act_log &&
731 mdev->act_log->nr_elements == mdev->sync_conf.al_extents)
732 return 0;
733
734 in_use = 0;
735 t = mdev->act_log;
736 n = lc_create("act_log", drbd_al_ext_cache,
737 mdev->sync_conf.al_extents, sizeof(struct lc_element), 0);
738
739 if (n == NULL) {
740 dev_err(DEV, "Cannot allocate act_log lru!\n");
741 return -ENOMEM;
742 }
743 spin_lock_irq(&mdev->al_lock);
744 if (t) {
745 for (i = 0; i < t->nr_elements; i++) {
746 e = lc_element_by_index(t, i);
747 if (e->refcnt)
748 dev_err(DEV, "refcnt(%d)==%d\n",
749 e->lc_number, e->refcnt);
750 in_use += e->refcnt;
751 }
752 }
753 if (!in_use)
754 mdev->act_log = n;
755 spin_unlock_irq(&mdev->al_lock);
756 if (in_use) {
757 dev_err(DEV, "Activity log still in use!\n");
758 lc_destroy(n);
759 return -EBUSY;
760 } else {
761 if (t)
762 lc_destroy(t);
763 }
764 drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */
765 return 0;
766 }
767
768 void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_seg_s) __must_hold(local)
769 {
770 struct request_queue * const q = mdev->rq_queue;
771 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
772 int max_segments = mdev->ldev->dc.max_bio_bvecs;
773
774 max_seg_s = min(queue_max_sectors(b) * queue_logical_block_size(b), max_seg_s);
775
776 blk_queue_max_hw_sectors(q, max_seg_s >> 9);
777 blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
778 blk_queue_max_segment_size(q, max_seg_s);
779 blk_queue_logical_block_size(q, 512);
780 blk_queue_segment_boundary(q, PAGE_SIZE-1);
781 blk_stack_limits(&q->limits, &b->limits, 0);
782
783 dev_info(DEV, "max_segment_size ( = BIO size ) = %u\n", queue_max_segment_size(q));
784
785 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
786 dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
787 q->backing_dev_info.ra_pages,
788 b->backing_dev_info.ra_pages);
789 q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
790 }
791 }
792
793 /* serialize deconfig (worker exiting, doing cleanup)
794 * and reconfig (drbdsetup disk, drbdsetup net)
795 *
796 * Wait for a potentially exiting worker, then restart it,
797 * or start a new one. Flush any pending work, there may still be an
798 * after_state_change queued.
799 */
800 static void drbd_reconfig_start(struct drbd_conf *mdev)
801 {
802 wait_event(mdev->state_wait, !test_and_set_bit(CONFIG_PENDING, &mdev->flags));
803 wait_event(mdev->state_wait, !test_bit(DEVICE_DYING, &mdev->flags));
804 drbd_thread_start(&mdev->worker);
805 drbd_flush_workqueue(mdev);
806 }
807
808 /* if still unconfigured, stops worker again.
809 * if configured now, clears CONFIG_PENDING.
810 * wakes potential waiters */
811 static void drbd_reconfig_done(struct drbd_conf *mdev)
812 {
813 spin_lock_irq(&mdev->req_lock);
814 if (mdev->state.disk == D_DISKLESS &&
815 mdev->state.conn == C_STANDALONE &&
816 mdev->state.role == R_SECONDARY) {
817 set_bit(DEVICE_DYING, &mdev->flags);
818 drbd_thread_stop_nowait(&mdev->worker);
819 } else
820 clear_bit(CONFIG_PENDING, &mdev->flags);
821 spin_unlock_irq(&mdev->req_lock);
822 wake_up(&mdev->state_wait);
823 }
824
825 /* Make sure IO is suspended before calling this function(). */
826 static void drbd_suspend_al(struct drbd_conf *mdev)
827 {
828 int s = 0;
829
830 if (lc_try_lock(mdev->act_log)) {
831 drbd_al_shrink(mdev);
832 lc_unlock(mdev->act_log);
833 } else {
834 dev_warn(DEV, "Failed to lock al in drbd_suspend_al()\n");
835 return;
836 }
837
838 spin_lock_irq(&mdev->req_lock);
839 if (mdev->state.conn < C_CONNECTED)
840 s = !test_and_set_bit(AL_SUSPENDED, &mdev->flags);
841
842 spin_unlock_irq(&mdev->req_lock);
843
844 if (s)
845 dev_info(DEV, "Suspended AL updates\n");
846 }
847
848 /* does always return 0;
849 * interesting return code is in reply->ret_code */
850 static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
851 struct drbd_nl_cfg_reply *reply)
852 {
853 enum drbd_ret_codes retcode;
854 enum determine_dev_size dd;
855 sector_t max_possible_sectors;
856 sector_t min_md_device_sectors;
857 struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
858 struct block_device *bdev;
859 struct lru_cache *resync_lru = NULL;
860 union drbd_state ns, os;
861 unsigned int max_seg_s;
862 int rv;
863 int cp_discovered = 0;
864 int logical_block_size;
865
866 drbd_reconfig_start(mdev);
867
868 /* if you want to reconfigure, please tear down first */
869 if (mdev->state.disk > D_DISKLESS) {
870 retcode = ERR_DISK_CONFIGURED;
871 goto fail;
872 }
873 /* It may just now have detached because of IO error. Make sure
874 * drbd_ldev_destroy is done already, we may end up here very fast,
875 * e.g. if someone calls attach from the on-io-error handler,
876 * to realize a "hot spare" feature (not that I'd recommend that) */
877 wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt));
878
879 /* allocation not in the IO path, cqueue thread context */
880 nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
881 if (!nbc) {
882 retcode = ERR_NOMEM;
883 goto fail;
884 }
885
886 nbc->dc.disk_size = DRBD_DISK_SIZE_SECT_DEF;
887 nbc->dc.on_io_error = DRBD_ON_IO_ERROR_DEF;
888 nbc->dc.fencing = DRBD_FENCING_DEF;
889 nbc->dc.max_bio_bvecs = DRBD_MAX_BIO_BVECS_DEF;
890
891 if (!disk_conf_from_tags(mdev, nlp->tag_list, &nbc->dc)) {
892 retcode = ERR_MANDATORY_TAG;
893 goto fail;
894 }
895
896 if (nbc->dc.meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
897 retcode = ERR_MD_IDX_INVALID;
898 goto fail;
899 }
900
901 if (get_net_conf(mdev)) {
902 int prot = mdev->net_conf->wire_protocol;
903 put_net_conf(mdev);
904 if (nbc->dc.fencing == FP_STONITH && prot == DRBD_PROT_A) {
905 retcode = ERR_STONITH_AND_PROT_A;
906 goto fail;
907 }
908 }
909
910 bdev = blkdev_get_by_path(nbc->dc.backing_dev,
911 FMODE_READ | FMODE_WRITE | FMODE_EXCL, mdev);
912 if (IS_ERR(bdev)) {
913 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev,
914 PTR_ERR(bdev));
915 retcode = ERR_OPEN_DISK;
916 goto fail;
917 }
918 nbc->backing_bdev = bdev;
919
920 /*
921 * meta_dev_idx >= 0: external fixed size, possibly multiple
922 * drbd sharing one meta device. TODO in that case, paranoia
923 * check that [md_bdev, meta_dev_idx] is not yet used by some
924 * other drbd minor! (if you use drbd.conf + drbdadm, that
925 * should check it for you already; but if you don't, or
926 * someone fooled it, we need to double check here)
927 */
928 bdev = blkdev_get_by_path(nbc->dc.meta_dev,
929 FMODE_READ | FMODE_WRITE | FMODE_EXCL,
930 (nbc->dc.meta_dev_idx < 0) ?
931 (void *)mdev : (void *)drbd_m_holder);
932 if (IS_ERR(bdev)) {
933 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev,
934 PTR_ERR(bdev));
935 retcode = ERR_OPEN_MD_DISK;
936 goto fail;
937 }
938 nbc->md_bdev = bdev;
939
940 if ((nbc->backing_bdev == nbc->md_bdev) !=
941 (nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
942 nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
943 retcode = ERR_MD_IDX_INVALID;
944 goto fail;
945 }
946
947 resync_lru = lc_create("resync", drbd_bm_ext_cache,
948 61, sizeof(struct bm_extent),
949 offsetof(struct bm_extent, lce));
950 if (!resync_lru) {
951 retcode = ERR_NOMEM;
952 goto fail;
953 }
954
955 /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
956 drbd_md_set_sector_offsets(mdev, nbc);
957
958 if (drbd_get_max_capacity(nbc) < nbc->dc.disk_size) {
959 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
960 (unsigned long long) drbd_get_max_capacity(nbc),
961 (unsigned long long) nbc->dc.disk_size);
962 retcode = ERR_DISK_TO_SMALL;
963 goto fail;
964 }
965
966 if (nbc->dc.meta_dev_idx < 0) {
967 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
968 /* at least one MB, otherwise it does not make sense */
969 min_md_device_sectors = (2<<10);
970 } else {
971 max_possible_sectors = DRBD_MAX_SECTORS;
972 min_md_device_sectors = MD_RESERVED_SECT * (nbc->dc.meta_dev_idx + 1);
973 }
974
975 if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
976 retcode = ERR_MD_DISK_TO_SMALL;
977 dev_warn(DEV, "refusing attach: md-device too small, "
978 "at least %llu sectors needed for this meta-disk type\n",
979 (unsigned long long) min_md_device_sectors);
980 goto fail;
981 }
982
983 /* Make sure the new disk is big enough
984 * (we may currently be R_PRIMARY with no local disk...) */
985 if (drbd_get_max_capacity(nbc) <
986 drbd_get_capacity(mdev->this_bdev)) {
987 retcode = ERR_DISK_TO_SMALL;
988 goto fail;
989 }
990
991 nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
992
993 if (nbc->known_size > max_possible_sectors) {
994 dev_warn(DEV, "==> truncating very big lower level device "
995 "to currently maximum possible %llu sectors <==\n",
996 (unsigned long long) max_possible_sectors);
997 if (nbc->dc.meta_dev_idx >= 0)
998 dev_warn(DEV, "==>> using internal or flexible "
999 "meta data may help <<==\n");
1000 }
1001
1002 drbd_suspend_io(mdev);
1003 /* also wait for the last barrier ack. */
1004 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt) || is_susp(mdev->state));
1005 /* and for any other previously queued work */
1006 drbd_flush_workqueue(mdev);
1007
1008 retcode = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
1009 drbd_resume_io(mdev);
1010 if (retcode < SS_SUCCESS)
1011 goto fail;
1012
1013 if (!get_ldev_if_state(mdev, D_ATTACHING))
1014 goto force_diskless;
1015
1016 drbd_md_set_sector_offsets(mdev, nbc);
1017
1018 /* allocate a second IO page if logical_block_size != 512 */
1019 logical_block_size = bdev_logical_block_size(nbc->md_bdev);
1020 if (logical_block_size == 0)
1021 logical_block_size = MD_SECTOR_SIZE;
1022
1023 if (logical_block_size != MD_SECTOR_SIZE) {
1024 if (!mdev->md_io_tmpp) {
1025 struct page *page = alloc_page(GFP_NOIO);
1026 if (!page)
1027 goto force_diskless_dec;
1028
1029 dev_warn(DEV, "Meta data's bdev logical_block_size = %d != %d\n",
1030 logical_block_size, MD_SECTOR_SIZE);
1031 dev_warn(DEV, "Workaround engaged (has performance impact).\n");
1032
1033 mdev->md_io_tmpp = page;
1034 }
1035 }
1036
1037 if (!mdev->bitmap) {
1038 if (drbd_bm_init(mdev)) {
1039 retcode = ERR_NOMEM;
1040 goto force_diskless_dec;
1041 }
1042 }
1043
1044 retcode = drbd_md_read(mdev, nbc);
1045 if (retcode != NO_ERROR)
1046 goto force_diskless_dec;
1047
1048 if (mdev->state.conn < C_CONNECTED &&
1049 mdev->state.role == R_PRIMARY &&
1050 (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
1051 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
1052 (unsigned long long)mdev->ed_uuid);
1053 retcode = ERR_DATA_NOT_CURRENT;
1054 goto force_diskless_dec;
1055 }
1056
1057 /* Since we are diskless, fix the activity log first... */
1058 if (drbd_check_al_size(mdev)) {
1059 retcode = ERR_NOMEM;
1060 goto force_diskless_dec;
1061 }
1062
1063 /* Prevent shrinking of consistent devices ! */
1064 if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
1065 drbd_new_dev_size(mdev, nbc, 0) < nbc->md.la_size_sect) {
1066 dev_warn(DEV, "refusing to truncate a consistent device\n");
1067 retcode = ERR_DISK_TO_SMALL;
1068 goto force_diskless_dec;
1069 }
1070
1071 if (!drbd_al_read_log(mdev, nbc)) {
1072 retcode = ERR_IO_MD_DISK;
1073 goto force_diskless_dec;
1074 }
1075
1076 /* Reset the "barriers don't work" bits here, then force meta data to
1077 * be written, to ensure we determine if barriers are supported. */
1078 if (nbc->dc.no_md_flush)
1079 set_bit(MD_NO_FUA, &mdev->flags);
1080 else
1081 clear_bit(MD_NO_FUA, &mdev->flags);
1082
1083 /* Point of no return reached.
1084 * Devices and memory are no longer released by error cleanup below.
1085 * now mdev takes over responsibility, and the state engine should
1086 * clean it up somewhere. */
1087 D_ASSERT(mdev->ldev == NULL);
1088 mdev->ldev = nbc;
1089 mdev->resync = resync_lru;
1090 nbc = NULL;
1091 resync_lru = NULL;
1092
1093 mdev->write_ordering = WO_bdev_flush;
1094 drbd_bump_write_ordering(mdev, WO_bdev_flush);
1095
1096 if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
1097 set_bit(CRASHED_PRIMARY, &mdev->flags);
1098 else
1099 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1100
1101 if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1102 !(mdev->state.role == R_PRIMARY && mdev->state.susp_nod)) {
1103 set_bit(CRASHED_PRIMARY, &mdev->flags);
1104 cp_discovered = 1;
1105 }
1106
1107 mdev->send_cnt = 0;
1108 mdev->recv_cnt = 0;
1109 mdev->read_cnt = 0;
1110 mdev->writ_cnt = 0;
1111
1112 max_seg_s = DRBD_MAX_SEGMENT_SIZE;
1113 if (mdev->state.conn == C_CONNECTED) {
1114 /* We are Primary, Connected, and now attach a new local
1115 * backing store. We must not increase the user visible maximum
1116 * bio size on this device to something the peer may not be
1117 * able to handle. */
1118 if (mdev->agreed_pro_version < 94)
1119 max_seg_s = queue_max_segment_size(mdev->rq_queue);
1120 else if (mdev->agreed_pro_version == 94)
1121 max_seg_s = DRBD_MAX_SIZE_H80_PACKET;
1122 /* else: drbd 8.3.9 and later, stay with default */
1123 }
1124
1125 drbd_setup_queue_param(mdev, max_seg_s);
1126
1127 /* If I am currently not R_PRIMARY,
1128 * but meta data primary indicator is set,
1129 * I just now recover from a hard crash,
1130 * and have been R_PRIMARY before that crash.
1131 *
1132 * Now, if I had no connection before that crash
1133 * (have been degraded R_PRIMARY), chances are that
1134 * I won't find my peer now either.
1135 *
1136 * In that case, and _only_ in that case,
1137 * we use the degr-wfc-timeout instead of the default,
1138 * so we can automatically recover from a crash of a
1139 * degraded but active "cluster" after a certain timeout.
1140 */
1141 clear_bit(USE_DEGR_WFC_T, &mdev->flags);
1142 if (mdev->state.role != R_PRIMARY &&
1143 drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1144 !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
1145 set_bit(USE_DEGR_WFC_T, &mdev->flags);
1146
1147 dd = drbd_determin_dev_size(mdev, 0);
1148 if (dd == dev_size_error) {
1149 retcode = ERR_NOMEM_BITMAP;
1150 goto force_diskless_dec;
1151 } else if (dd == grew)
1152 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
1153
1154 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
1155 dev_info(DEV, "Assuming that all blocks are out of sync "
1156 "(aka FullSync)\n");
1157 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from attaching")) {
1158 retcode = ERR_IO_MD_DISK;
1159 goto force_diskless_dec;
1160 }
1161 } else {
1162 if (drbd_bitmap_io(mdev, &drbd_bm_read, "read from attaching") < 0) {
1163 retcode = ERR_IO_MD_DISK;
1164 goto force_diskless_dec;
1165 }
1166 }
1167
1168 if (cp_discovered) {
1169 drbd_al_apply_to_bm(mdev);
1170 drbd_al_to_on_disk_bm(mdev);
1171 }
1172
1173 if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev))
1174 drbd_suspend_al(mdev); /* IO is still suspended here... */
1175
1176 spin_lock_irq(&mdev->req_lock);
1177 os = mdev->state;
1178 ns.i = os.i;
1179 /* If MDF_CONSISTENT is not set go into inconsistent state,
1180 otherwise investigate MDF_WasUpToDate...
1181 If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1182 otherwise into D_CONSISTENT state.
1183 */
1184 if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
1185 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
1186 ns.disk = D_CONSISTENT;
1187 else
1188 ns.disk = D_OUTDATED;
1189 } else {
1190 ns.disk = D_INCONSISTENT;
1191 }
1192
1193 if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
1194 ns.pdsk = D_OUTDATED;
1195
1196 if ( ns.disk == D_CONSISTENT &&
1197 (ns.pdsk == D_OUTDATED || mdev->ldev->dc.fencing == FP_DONT_CARE))
1198 ns.disk = D_UP_TO_DATE;
1199
1200 /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1201 MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1202 this point, because drbd_request_state() modifies these
1203 flags. */
1204
1205 /* In case we are C_CONNECTED postpone any decision on the new disk
1206 state after the negotiation phase. */
1207 if (mdev->state.conn == C_CONNECTED) {
1208 mdev->new_state_tmp.i = ns.i;
1209 ns.i = os.i;
1210 ns.disk = D_NEGOTIATING;
1211
1212 /* We expect to receive up-to-date UUIDs soon.
1213 To avoid a race in receive_state, free p_uuid while
1214 holding req_lock. I.e. atomic with the state change */
1215 kfree(mdev->p_uuid);
1216 mdev->p_uuid = NULL;
1217 }
1218
1219 rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
1220 ns = mdev->state;
1221 spin_unlock_irq(&mdev->req_lock);
1222
1223 if (rv < SS_SUCCESS)
1224 goto force_diskless_dec;
1225
1226 if (mdev->state.role == R_PRIMARY)
1227 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
1228 else
1229 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1230
1231 drbd_md_mark_dirty(mdev);
1232 drbd_md_sync(mdev);
1233
1234 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1235 put_ldev(mdev);
1236 reply->ret_code = retcode;
1237 drbd_reconfig_done(mdev);
1238 return 0;
1239
1240 force_diskless_dec:
1241 put_ldev(mdev);
1242 force_diskless:
1243 drbd_force_state(mdev, NS(disk, D_FAILED));
1244 drbd_md_sync(mdev);
1245 fail:
1246 if (nbc) {
1247 if (nbc->backing_bdev)
1248 blkdev_put(nbc->backing_bdev,
1249 FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1250 if (nbc->md_bdev)
1251 blkdev_put(nbc->md_bdev,
1252 FMODE_READ | FMODE_WRITE | FMODE_EXCL);
1253 kfree(nbc);
1254 }
1255 lc_destroy(resync_lru);
1256
1257 reply->ret_code = retcode;
1258 drbd_reconfig_done(mdev);
1259 return 0;
1260 }
1261
1262 /* Detaching the disk is a process in multiple stages. First we need to lock
1263 * out application IO, in-flight IO, IO stuck in drbd_al_begin_io.
1264 * Then we transition to D_DISKLESS, and wait for put_ldev() to return all
1265 * internal references as well.
1266 * Only then we have finally detached. */
1267 static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1268 struct drbd_nl_cfg_reply *reply)
1269 {
1270 drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */
1271 reply->ret_code = drbd_request_state(mdev, NS(disk, D_DISKLESS));
1272 if (mdev->state.disk == D_DISKLESS)
1273 wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt));
1274 drbd_resume_io(mdev);
1275 return 0;
1276 }
1277
1278 static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1279 struct drbd_nl_cfg_reply *reply)
1280 {
1281 int i, ns;
1282 enum drbd_ret_codes retcode;
1283 struct net_conf *new_conf = NULL;
1284 struct crypto_hash *tfm = NULL;
1285 struct crypto_hash *integrity_w_tfm = NULL;
1286 struct crypto_hash *integrity_r_tfm = NULL;
1287 struct hlist_head *new_tl_hash = NULL;
1288 struct hlist_head *new_ee_hash = NULL;
1289 struct drbd_conf *odev;
1290 char hmac_name[CRYPTO_MAX_ALG_NAME];
1291 void *int_dig_out = NULL;
1292 void *int_dig_in = NULL;
1293 void *int_dig_vv = NULL;
1294 struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr;
1295
1296 drbd_reconfig_start(mdev);
1297
1298 if (mdev->state.conn > C_STANDALONE) {
1299 retcode = ERR_NET_CONFIGURED;
1300 goto fail;
1301 }
1302
1303 /* allocation not in the IO path, cqueue thread context */
1304 new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
1305 if (!new_conf) {
1306 retcode = ERR_NOMEM;
1307 goto fail;
1308 }
1309
1310 new_conf->timeout = DRBD_TIMEOUT_DEF;
1311 new_conf->try_connect_int = DRBD_CONNECT_INT_DEF;
1312 new_conf->ping_int = DRBD_PING_INT_DEF;
1313 new_conf->max_epoch_size = DRBD_MAX_EPOCH_SIZE_DEF;
1314 new_conf->max_buffers = DRBD_MAX_BUFFERS_DEF;
1315 new_conf->unplug_watermark = DRBD_UNPLUG_WATERMARK_DEF;
1316 new_conf->sndbuf_size = DRBD_SNDBUF_SIZE_DEF;
1317 new_conf->rcvbuf_size = DRBD_RCVBUF_SIZE_DEF;
1318 new_conf->ko_count = DRBD_KO_COUNT_DEF;
1319 new_conf->after_sb_0p = DRBD_AFTER_SB_0P_DEF;
1320 new_conf->after_sb_1p = DRBD_AFTER_SB_1P_DEF;
1321 new_conf->after_sb_2p = DRBD_AFTER_SB_2P_DEF;
1322 new_conf->want_lose = 0;
1323 new_conf->two_primaries = 0;
1324 new_conf->wire_protocol = DRBD_PROT_C;
1325 new_conf->ping_timeo = DRBD_PING_TIMEO_DEF;
1326 new_conf->rr_conflict = DRBD_RR_CONFLICT_DEF;
1327
1328 if (!net_conf_from_tags(mdev, nlp->tag_list, new_conf)) {
1329 retcode = ERR_MANDATORY_TAG;
1330 goto fail;
1331 }
1332
1333 if (new_conf->two_primaries
1334 && (new_conf->wire_protocol != DRBD_PROT_C)) {
1335 retcode = ERR_NOT_PROTO_C;
1336 goto fail;
1337 }
1338
1339 if (get_ldev(mdev)) {
1340 enum drbd_fencing_p fp = mdev->ldev->dc.fencing;
1341 put_ldev(mdev);
1342 if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH) {
1343 retcode = ERR_STONITH_AND_PROT_A;
1344 goto fail;
1345 }
1346 }
1347
1348 if (mdev->state.role == R_PRIMARY && new_conf->want_lose) {
1349 retcode = ERR_DISCARD;
1350 goto fail;
1351 }
1352
1353 retcode = NO_ERROR;
1354
1355 new_my_addr = (struct sockaddr *)&new_conf->my_addr;
1356 new_peer_addr = (struct sockaddr *)&new_conf->peer_addr;
1357 for (i = 0; i < minor_count; i++) {
1358 odev = minor_to_mdev(i);
1359 if (!odev || odev == mdev)
1360 continue;
1361 if (get_net_conf(odev)) {
1362 taken_addr = (struct sockaddr *)&odev->net_conf->my_addr;
1363 if (new_conf->my_addr_len == odev->net_conf->my_addr_len &&
1364 !memcmp(new_my_addr, taken_addr, new_conf->my_addr_len))
1365 retcode = ERR_LOCAL_ADDR;
1366
1367 taken_addr = (struct sockaddr *)&odev->net_conf->peer_addr;
1368 if (new_conf->peer_addr_len == odev->net_conf->peer_addr_len &&
1369 !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len))
1370 retcode = ERR_PEER_ADDR;
1371
1372 put_net_conf(odev);
1373 if (retcode != NO_ERROR)
1374 goto fail;
1375 }
1376 }
1377
1378 if (new_conf->cram_hmac_alg[0] != 0) {
1379 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
1380 new_conf->cram_hmac_alg);
1381 tfm = crypto_alloc_hash(hmac_name, 0, CRYPTO_ALG_ASYNC);
1382 if (IS_ERR(tfm)) {
1383 tfm = NULL;
1384 retcode = ERR_AUTH_ALG;
1385 goto fail;
1386 }
1387
1388 if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) {
1389 retcode = ERR_AUTH_ALG_ND;
1390 goto fail;
1391 }
1392 }
1393
1394 if (new_conf->integrity_alg[0]) {
1395 integrity_w_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1396 if (IS_ERR(integrity_w_tfm)) {
1397 integrity_w_tfm = NULL;
1398 retcode=ERR_INTEGRITY_ALG;
1399 goto fail;
1400 }
1401
1402 if (!drbd_crypto_is_hash(crypto_hash_tfm(integrity_w_tfm))) {
1403 retcode=ERR_INTEGRITY_ALG_ND;
1404 goto fail;
1405 }
1406
1407 integrity_r_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1408 if (IS_ERR(integrity_r_tfm)) {
1409 integrity_r_tfm = NULL;
1410 retcode=ERR_INTEGRITY_ALG;
1411 goto fail;
1412 }
1413 }
1414
1415 ns = new_conf->max_epoch_size/8;
1416 if (mdev->tl_hash_s != ns) {
1417 new_tl_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
1418 if (!new_tl_hash) {
1419 retcode = ERR_NOMEM;
1420 goto fail;
1421 }
1422 }
1423
1424 ns = new_conf->max_buffers/8;
1425 if (new_conf->two_primaries && (mdev->ee_hash_s != ns)) {
1426 new_ee_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
1427 if (!new_ee_hash) {
1428 retcode = ERR_NOMEM;
1429 goto fail;
1430 }
1431 }
1432
1433 ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
1434
1435 if (integrity_w_tfm) {
1436 i = crypto_hash_digestsize(integrity_w_tfm);
1437 int_dig_out = kmalloc(i, GFP_KERNEL);
1438 if (!int_dig_out) {
1439 retcode = ERR_NOMEM;
1440 goto fail;
1441 }
1442 int_dig_in = kmalloc(i, GFP_KERNEL);
1443 if (!int_dig_in) {
1444 retcode = ERR_NOMEM;
1445 goto fail;
1446 }
1447 int_dig_vv = kmalloc(i, GFP_KERNEL);
1448 if (!int_dig_vv) {
1449 retcode = ERR_NOMEM;
1450 goto fail;
1451 }
1452 }
1453
1454 if (!mdev->bitmap) {
1455 if(drbd_bm_init(mdev)) {
1456 retcode = ERR_NOMEM;
1457 goto fail;
1458 }
1459 }
1460
1461 drbd_flush_workqueue(mdev);
1462 spin_lock_irq(&mdev->req_lock);
1463 if (mdev->net_conf != NULL) {
1464 retcode = ERR_NET_CONFIGURED;
1465 spin_unlock_irq(&mdev->req_lock);
1466 goto fail;
1467 }
1468 mdev->net_conf = new_conf;
1469
1470 mdev->send_cnt = 0;
1471 mdev->recv_cnt = 0;
1472
1473 if (new_tl_hash) {
1474 kfree(mdev->tl_hash);
1475 mdev->tl_hash_s = mdev->net_conf->max_epoch_size/8;
1476 mdev->tl_hash = new_tl_hash;
1477 }
1478
1479 if (new_ee_hash) {
1480 kfree(mdev->ee_hash);
1481 mdev->ee_hash_s = mdev->net_conf->max_buffers/8;
1482 mdev->ee_hash = new_ee_hash;
1483 }
1484
1485 crypto_free_hash(mdev->cram_hmac_tfm);
1486 mdev->cram_hmac_tfm = tfm;
1487
1488 crypto_free_hash(mdev->integrity_w_tfm);
1489 mdev->integrity_w_tfm = integrity_w_tfm;
1490
1491 crypto_free_hash(mdev->integrity_r_tfm);
1492 mdev->integrity_r_tfm = integrity_r_tfm;
1493
1494 kfree(mdev->int_dig_out);
1495 kfree(mdev->int_dig_in);
1496 kfree(mdev->int_dig_vv);
1497 mdev->int_dig_out=int_dig_out;
1498 mdev->int_dig_in=int_dig_in;
1499 mdev->int_dig_vv=int_dig_vv;
1500 retcode = _drbd_set_state(_NS(mdev, conn, C_UNCONNECTED), CS_VERBOSE, NULL);
1501 spin_unlock_irq(&mdev->req_lock);
1502
1503 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1504 reply->ret_code = retcode;
1505 drbd_reconfig_done(mdev);
1506 return 0;
1507
1508 fail:
1509 kfree(int_dig_out);
1510 kfree(int_dig_in);
1511 kfree(int_dig_vv);
1512 crypto_free_hash(tfm);
1513 crypto_free_hash(integrity_w_tfm);
1514 crypto_free_hash(integrity_r_tfm);
1515 kfree(new_tl_hash);
1516 kfree(new_ee_hash);
1517 kfree(new_conf);
1518
1519 reply->ret_code = retcode;
1520 drbd_reconfig_done(mdev);
1521 return 0;
1522 }
1523
1524 static int drbd_nl_disconnect(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1525 struct drbd_nl_cfg_reply *reply)
1526 {
1527 int retcode;
1528
1529 retcode = _drbd_request_state(mdev, NS(conn, C_DISCONNECTING), CS_ORDERED);
1530
1531 if (retcode == SS_NOTHING_TO_DO)
1532 goto done;
1533 else if (retcode == SS_ALREADY_STANDALONE)
1534 goto done;
1535 else if (retcode == SS_PRIMARY_NOP) {
1536 /* Our statche checking code wants to see the peer outdated. */
1537 retcode = drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
1538 pdsk, D_OUTDATED));
1539 } else if (retcode == SS_CW_FAILED_BY_PEER) {
1540 /* The peer probably wants to see us outdated. */
1541 retcode = _drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
1542 disk, D_OUTDATED),
1543 CS_ORDERED);
1544 if (retcode == SS_IS_DISKLESS || retcode == SS_LOWER_THAN_OUTDATED) {
1545 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
1546 retcode = SS_SUCCESS;
1547 }
1548 }
1549
1550 if (retcode < SS_SUCCESS)
1551 goto fail;
1552
1553 if (wait_event_interruptible(mdev->state_wait,
1554 mdev->state.conn != C_DISCONNECTING)) {
1555 /* Do not test for mdev->state.conn == C_STANDALONE, since
1556 someone else might connect us in the mean time! */
1557 retcode = ERR_INTR;
1558 goto fail;
1559 }
1560
1561 done:
1562 retcode = NO_ERROR;
1563 fail:
1564 drbd_md_sync(mdev);
1565 reply->ret_code = retcode;
1566 return 0;
1567 }
1568
1569 void resync_after_online_grow(struct drbd_conf *mdev)
1570 {
1571 int iass; /* I am sync source */
1572
1573 dev_info(DEV, "Resync of new storage after online grow\n");
1574 if (mdev->state.role != mdev->state.peer)
1575 iass = (mdev->state.role == R_PRIMARY);
1576 else
1577 iass = test_bit(DISCARD_CONCURRENT, &mdev->flags);
1578
1579 if (iass)
1580 drbd_start_resync(mdev, C_SYNC_SOURCE);
1581 else
1582 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
1583 }
1584
1585 static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1586 struct drbd_nl_cfg_reply *reply)
1587 {
1588 struct resize rs;
1589 int retcode = NO_ERROR;
1590 enum determine_dev_size dd;
1591 enum dds_flags ddsf;
1592
1593 memset(&rs, 0, sizeof(struct resize));
1594 if (!resize_from_tags(mdev, nlp->tag_list, &rs)) {
1595 retcode = ERR_MANDATORY_TAG;
1596 goto fail;
1597 }
1598
1599 if (mdev->state.conn > C_CONNECTED) {
1600 retcode = ERR_RESIZE_RESYNC;
1601 goto fail;
1602 }
1603
1604 if (mdev->state.role == R_SECONDARY &&
1605 mdev->state.peer == R_SECONDARY) {
1606 retcode = ERR_NO_PRIMARY;
1607 goto fail;
1608 }
1609
1610 if (!get_ldev(mdev)) {
1611 retcode = ERR_NO_DISK;
1612 goto fail;
1613 }
1614
1615 if (rs.no_resync && mdev->agreed_pro_version < 93) {
1616 retcode = ERR_NEED_APV_93;
1617 goto fail;
1618 }
1619
1620 if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev))
1621 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
1622
1623 mdev->ldev->dc.disk_size = (sector_t)rs.resize_size;
1624 ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
1625 dd = drbd_determin_dev_size(mdev, ddsf);
1626 drbd_md_sync(mdev);
1627 put_ldev(mdev);
1628 if (dd == dev_size_error) {
1629 retcode = ERR_NOMEM_BITMAP;
1630 goto fail;
1631 }
1632
1633 if (mdev->state.conn == C_CONNECTED) {
1634 if (dd == grew)
1635 set_bit(RESIZE_PENDING, &mdev->flags);
1636
1637 drbd_send_uuids(mdev);
1638 drbd_send_sizes(mdev, 1, ddsf);
1639 }
1640
1641 fail:
1642 reply->ret_code = retcode;
1643 return 0;
1644 }
1645
1646 static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1647 struct drbd_nl_cfg_reply *reply)
1648 {
1649 int retcode = NO_ERROR;
1650 int err;
1651 int ovr; /* online verify running */
1652 int rsr; /* re-sync running */
1653 struct crypto_hash *verify_tfm = NULL;
1654 struct crypto_hash *csums_tfm = NULL;
1655 struct syncer_conf sc;
1656 cpumask_var_t new_cpu_mask;
1657 int *rs_plan_s = NULL;
1658 int fifo_size;
1659
1660 if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) {
1661 retcode = ERR_NOMEM;
1662 goto fail;
1663 }
1664
1665 if (nlp->flags & DRBD_NL_SET_DEFAULTS) {
1666 memset(&sc, 0, sizeof(struct syncer_conf));
1667 sc.rate = DRBD_RATE_DEF;
1668 sc.after = DRBD_AFTER_DEF;
1669 sc.al_extents = DRBD_AL_EXTENTS_DEF;
1670 sc.on_no_data = DRBD_ON_NO_DATA_DEF;
1671 sc.c_plan_ahead = DRBD_C_PLAN_AHEAD_DEF;
1672 sc.c_delay_target = DRBD_C_DELAY_TARGET_DEF;
1673 sc.c_fill_target = DRBD_C_FILL_TARGET_DEF;
1674 sc.c_max_rate = DRBD_C_MAX_RATE_DEF;
1675 sc.c_min_rate = DRBD_C_MIN_RATE_DEF;
1676 } else
1677 memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf));
1678
1679 if (!syncer_conf_from_tags(mdev, nlp->tag_list, &sc)) {
1680 retcode = ERR_MANDATORY_TAG;
1681 goto fail;
1682 }
1683
1684 /* re-sync running */
1685 rsr = ( mdev->state.conn == C_SYNC_SOURCE ||
1686 mdev->state.conn == C_SYNC_TARGET ||
1687 mdev->state.conn == C_PAUSED_SYNC_S ||
1688 mdev->state.conn == C_PAUSED_SYNC_T );
1689
1690 if (rsr && strcmp(sc.csums_alg, mdev->sync_conf.csums_alg)) {
1691 retcode = ERR_CSUMS_RESYNC_RUNNING;
1692 goto fail;
1693 }
1694
1695 if (!rsr && sc.csums_alg[0]) {
1696 csums_tfm = crypto_alloc_hash(sc.csums_alg, 0, CRYPTO_ALG_ASYNC);
1697 if (IS_ERR(csums_tfm)) {
1698 csums_tfm = NULL;
1699 retcode = ERR_CSUMS_ALG;
1700 goto fail;
1701 }
1702
1703 if (!drbd_crypto_is_hash(crypto_hash_tfm(csums_tfm))) {
1704 retcode = ERR_CSUMS_ALG_ND;
1705 goto fail;
1706 }
1707 }
1708
1709 /* online verify running */
1710 ovr = (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T);
1711
1712 if (ovr) {
1713 if (strcmp(sc.verify_alg, mdev->sync_conf.verify_alg)) {
1714 retcode = ERR_VERIFY_RUNNING;
1715 goto fail;
1716 }
1717 }
1718
1719 if (!ovr && sc.verify_alg[0]) {
1720 verify_tfm = crypto_alloc_hash(sc.verify_alg, 0, CRYPTO_ALG_ASYNC);
1721 if (IS_ERR(verify_tfm)) {
1722 verify_tfm = NULL;
1723 retcode = ERR_VERIFY_ALG;
1724 goto fail;
1725 }
1726
1727 if (!drbd_crypto_is_hash(crypto_hash_tfm(verify_tfm))) {
1728 retcode = ERR_VERIFY_ALG_ND;
1729 goto fail;
1730 }
1731 }
1732
1733 /* silently ignore cpu mask on UP kernel */
1734 if (nr_cpu_ids > 1 && sc.cpu_mask[0] != 0) {
1735 err = __bitmap_parse(sc.cpu_mask, 32, 0,
1736 cpumask_bits(new_cpu_mask), nr_cpu_ids);
1737 if (err) {
1738 dev_warn(DEV, "__bitmap_parse() failed with %d\n", err);
1739 retcode = ERR_CPU_MASK_PARSE;
1740 goto fail;
1741 }
1742 }
1743
1744 ERR_IF (sc.rate < 1) sc.rate = 1;
1745 ERR_IF (sc.al_extents < 7) sc.al_extents = 127; /* arbitrary minimum */
1746 #define AL_MAX ((MD_AL_MAX_SIZE-1) * AL_EXTENTS_PT)
1747 if (sc.al_extents > AL_MAX) {
1748 dev_err(DEV, "sc.al_extents > %d\n", AL_MAX);
1749 sc.al_extents = AL_MAX;
1750 }
1751 #undef AL_MAX
1752
1753 /* to avoid spurious errors when configuring minors before configuring
1754 * the minors they depend on: if necessary, first create the minor we
1755 * depend on */
1756 if (sc.after >= 0)
1757 ensure_mdev(sc.after, 1);
1758
1759 /* most sanity checks done, try to assign the new sync-after
1760 * dependency. need to hold the global lock in there,
1761 * to avoid a race in the dependency loop check. */
1762 retcode = drbd_alter_sa(mdev, sc.after);
1763 if (retcode != NO_ERROR)
1764 goto fail;
1765
1766 fifo_size = (sc.c_plan_ahead * 10 * SLEEP_TIME) / HZ;
1767 if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) {
1768 rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL);
1769 if (!rs_plan_s) {
1770 dev_err(DEV, "kmalloc of fifo_buffer failed");
1771 retcode = ERR_NOMEM;
1772 goto fail;
1773 }
1774 }
1775
1776 /* ok, assign the rest of it as well.
1777 * lock against receive_SyncParam() */
1778 spin_lock(&mdev->peer_seq_lock);
1779 mdev->sync_conf = sc;
1780
1781 if (!rsr) {
1782 crypto_free_hash(mdev->csums_tfm);
1783 mdev->csums_tfm = csums_tfm;
1784 csums_tfm = NULL;
1785 }
1786
1787 if (!ovr) {
1788 crypto_free_hash(mdev->verify_tfm);
1789 mdev->verify_tfm = verify_tfm;
1790 verify_tfm = NULL;
1791 }
1792
1793 if (fifo_size != mdev->rs_plan_s.size) {
1794 kfree(mdev->rs_plan_s.values);
1795 mdev->rs_plan_s.values = rs_plan_s;
1796 mdev->rs_plan_s.size = fifo_size;
1797 mdev->rs_planed = 0;
1798 rs_plan_s = NULL;
1799 }
1800
1801 spin_unlock(&mdev->peer_seq_lock);
1802
1803 if (get_ldev(mdev)) {
1804 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
1805 drbd_al_shrink(mdev);
1806 err = drbd_check_al_size(mdev);
1807 lc_unlock(mdev->act_log);
1808 wake_up(&mdev->al_wait);
1809
1810 put_ldev(mdev);
1811 drbd_md_sync(mdev);
1812
1813 if (err) {
1814 retcode = ERR_NOMEM;
1815 goto fail;
1816 }
1817 }
1818
1819 if (mdev->state.conn >= C_CONNECTED)
1820 drbd_send_sync_param(mdev, &sc);
1821
1822 if (!cpumask_equal(mdev->cpu_mask, new_cpu_mask)) {
1823 cpumask_copy(mdev->cpu_mask, new_cpu_mask);
1824 drbd_calc_cpu_mask(mdev);
1825 mdev->receiver.reset_cpu_mask = 1;
1826 mdev->asender.reset_cpu_mask = 1;
1827 mdev->worker.reset_cpu_mask = 1;
1828 }
1829
1830 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1831 fail:
1832 kfree(rs_plan_s);
1833 free_cpumask_var(new_cpu_mask);
1834 crypto_free_hash(csums_tfm);
1835 crypto_free_hash(verify_tfm);
1836 reply->ret_code = retcode;
1837 return 0;
1838 }
1839
1840 static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1841 struct drbd_nl_cfg_reply *reply)
1842 {
1843 int retcode;
1844
1845 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
1846
1847 if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
1848 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1849
1850 while (retcode == SS_NEED_CONNECTION) {
1851 spin_lock_irq(&mdev->req_lock);
1852 if (mdev->state.conn < C_CONNECTED)
1853 retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL);
1854 spin_unlock_irq(&mdev->req_lock);
1855
1856 if (retcode != SS_NEED_CONNECTION)
1857 break;
1858
1859 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1860 }
1861
1862 reply->ret_code = retcode;
1863 return 0;
1864 }
1865
1866 static int drbd_bmio_set_susp_al(struct drbd_conf *mdev)
1867 {
1868 int rv;
1869
1870 rv = drbd_bmio_set_n_write(mdev);
1871 drbd_suspend_al(mdev);
1872 return rv;
1873 }
1874
1875 static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1876 struct drbd_nl_cfg_reply *reply)
1877 {
1878 int retcode;
1879
1880 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED);
1881
1882 if (retcode < SS_SUCCESS) {
1883 if (retcode == SS_NEED_CONNECTION && mdev->state.role == R_PRIMARY) {
1884 /* The peer will get a resync upon connect anyways. Just make that
1885 into a full resync. */
1886 retcode = drbd_request_state(mdev, NS(pdsk, D_INCONSISTENT));
1887 if (retcode >= SS_SUCCESS) {
1888 /* open coded drbd_bitmap_io() */
1889 if (drbd_bitmap_io(mdev, &drbd_bmio_set_susp_al,
1890 "set_n_write from invalidate_peer"))
1891 retcode = ERR_IO_MD_DISK;
1892 }
1893 } else
1894 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
1895 }
1896
1897 reply->ret_code = retcode;
1898 return 0;
1899 }
1900
1901 static int drbd_nl_pause_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1902 struct drbd_nl_cfg_reply *reply)
1903 {
1904 int retcode = NO_ERROR;
1905
1906 if (drbd_request_state(mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
1907 retcode = ERR_PAUSE_IS_SET;
1908
1909 reply->ret_code = retcode;
1910 return 0;
1911 }
1912
1913 static int drbd_nl_resume_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1914 struct drbd_nl_cfg_reply *reply)
1915 {
1916 int retcode = NO_ERROR;
1917
1918 if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO)
1919 retcode = ERR_PAUSE_IS_CLEAR;
1920
1921 reply->ret_code = retcode;
1922 return 0;
1923 }
1924
1925 static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1926 struct drbd_nl_cfg_reply *reply)
1927 {
1928 reply->ret_code = drbd_request_state(mdev, NS(susp, 1));
1929
1930 return 0;
1931 }
1932
1933 static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1934 struct drbd_nl_cfg_reply *reply)
1935 {
1936 if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
1937 drbd_uuid_new_current(mdev);
1938 clear_bit(NEW_CUR_UUID, &mdev->flags);
1939 }
1940 drbd_suspend_io(mdev);
1941 reply->ret_code = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0));
1942 if (reply->ret_code == SS_SUCCESS) {
1943 if (mdev->state.conn < C_CONNECTED)
1944 tl_clear(mdev);
1945 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED)
1946 tl_restart(mdev, fail_frozen_disk_io);
1947 }
1948 drbd_resume_io(mdev);
1949
1950 return 0;
1951 }
1952
1953 static int drbd_nl_outdate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1954 struct drbd_nl_cfg_reply *reply)
1955 {
1956 reply->ret_code = drbd_request_state(mdev, NS(disk, D_OUTDATED));
1957 return 0;
1958 }
1959
1960 static int drbd_nl_get_config(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1961 struct drbd_nl_cfg_reply *reply)
1962 {
1963 unsigned short *tl;
1964
1965 tl = reply->tag_list;
1966
1967 if (get_ldev(mdev)) {
1968 tl = disk_conf_to_tags(mdev, &mdev->ldev->dc, tl);
1969 put_ldev(mdev);
1970 }
1971
1972 if (get_net_conf(mdev)) {
1973 tl = net_conf_to_tags(mdev, mdev->net_conf, tl);
1974 put_net_conf(mdev);
1975 }
1976 tl = syncer_conf_to_tags(mdev, &mdev->sync_conf, tl);
1977
1978 put_unaligned(TT_END, tl++); /* Close the tag list */
1979
1980 return (int)((char *)tl - (char *)reply->tag_list);
1981 }
1982
1983 static int drbd_nl_get_state(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1984 struct drbd_nl_cfg_reply *reply)
1985 {
1986 unsigned short *tl = reply->tag_list;
1987 union drbd_state s = mdev->state;
1988 unsigned long rs_left;
1989 unsigned int res;
1990
1991 tl = get_state_to_tags(mdev, (struct get_state *)&s, tl);
1992
1993 /* no local ref, no bitmap, no syncer progress. */
1994 if (s.conn >= C_SYNC_SOURCE && s.conn <= C_PAUSED_SYNC_T) {
1995 if (get_ldev(mdev)) {
1996 drbd_get_syncer_progress(mdev, &rs_left, &res);
1997 tl = tl_add_int(tl, T_sync_progress, &res);
1998 put_ldev(mdev);
1999 }
2000 }
2001 put_unaligned(TT_END, tl++); /* Close the tag list */
2002
2003 return (int)((char *)tl - (char *)reply->tag_list);
2004 }
2005
2006 static int drbd_nl_get_uuids(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2007 struct drbd_nl_cfg_reply *reply)
2008 {
2009 unsigned short *tl;
2010
2011 tl = reply->tag_list;
2012
2013 if (get_ldev(mdev)) {
2014 tl = tl_add_blob(tl, T_uuids, mdev->ldev->md.uuid, UI_SIZE*sizeof(u64));
2015 tl = tl_add_int(tl, T_uuids_flags, &mdev->ldev->md.flags);
2016 put_ldev(mdev);
2017 }
2018 put_unaligned(TT_END, tl++); /* Close the tag list */
2019
2020 return (int)((char *)tl - (char *)reply->tag_list);
2021 }
2022
2023 /**
2024 * drbd_nl_get_timeout_flag() - Used by drbdsetup to find out which timeout value to use
2025 * @mdev: DRBD device.
2026 * @nlp: Netlink/connector packet from drbdsetup
2027 * @reply: Reply packet for drbdsetup
2028 */
2029 static int drbd_nl_get_timeout_flag(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2030 struct drbd_nl_cfg_reply *reply)
2031 {
2032 unsigned short *tl;
2033 char rv;
2034
2035 tl = reply->tag_list;
2036
2037 rv = mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
2038 test_bit(USE_DEGR_WFC_T, &mdev->flags) ? UT_DEGRADED : UT_DEFAULT;
2039
2040 tl = tl_add_blob(tl, T_use_degraded, &rv, sizeof(rv));
2041 put_unaligned(TT_END, tl++); /* Close the tag list */
2042
2043 return (int)((char *)tl - (char *)reply->tag_list);
2044 }
2045
2046 static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2047 struct drbd_nl_cfg_reply *reply)
2048 {
2049 /* default to resume from last known position, if possible */
2050 struct start_ov args =
2051 { .start_sector = mdev->ov_start_sector };
2052
2053 if (!start_ov_from_tags(mdev, nlp->tag_list, &args)) {
2054 reply->ret_code = ERR_MANDATORY_TAG;
2055 return 0;
2056 }
2057 /* w_make_ov_request expects position to be aligned */
2058 mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT;
2059 reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
2060 return 0;
2061 }
2062
2063
2064 static int drbd_nl_new_c_uuid(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
2065 struct drbd_nl_cfg_reply *reply)
2066 {
2067 int retcode = NO_ERROR;
2068 int skip_initial_sync = 0;
2069 int err;
2070
2071 struct new_c_uuid args;
2072
2073 memset(&args, 0, sizeof(struct new_c_uuid));
2074 if (!new_c_uuid_from_tags(mdev, nlp->tag_list, &args)) {
2075 reply->ret_code = ERR_MANDATORY_TAG;
2076 return 0;
2077 }
2078
2079 mutex_lock(&mdev->state_mutex); /* Protects us against serialized state changes. */
2080
2081 if (!get_ldev(mdev)) {
2082 retcode = ERR_NO_DISK;
2083 goto out;
2084 }
2085
2086 /* this is "skip initial sync", assume to be clean */
2087 if (mdev->state.conn == C_CONNECTED && mdev->agreed_pro_version >= 90 &&
2088 mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
2089 dev_info(DEV, "Preparing to skip initial sync\n");
2090 skip_initial_sync = 1;
2091 } else if (mdev->state.conn != C_STANDALONE) {
2092 retcode = ERR_CONNECTED;
2093 goto out_dec;
2094 }
2095
2096 drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
2097 drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
2098
2099 if (args.clear_bm) {
2100 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, "clear_n_write from new_c_uuid");
2101 if (err) {
2102 dev_err(DEV, "Writing bitmap failed with %d\n",err);
2103 retcode = ERR_IO_MD_DISK;
2104 }
2105 if (skip_initial_sync) {
2106 drbd_send_uuids_skip_initial_sync(mdev);
2107 _drbd_uuid_set(mdev, UI_BITMAP, 0);
2108 spin_lock_irq(&mdev->req_lock);
2109 _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
2110 CS_VERBOSE, NULL);
2111 spin_unlock_irq(&mdev->req_lock);
2112 }
2113 }
2114
2115 drbd_md_sync(mdev);
2116 out_dec:
2117 put_ldev(mdev);
2118 out:
2119 mutex_unlock(&mdev->state_mutex);
2120
2121 reply->ret_code = retcode;
2122 return 0;
2123 }
2124
2125 struct cn_handler_struct {
2126 int (*function)(struct drbd_conf *,
2127 struct drbd_nl_cfg_req *,
2128 struct drbd_nl_cfg_reply *);
2129 int reply_body_size;
2130 };
2131
2132 static struct cn_handler_struct cnd_table[] = {
2133 [ P_primary ] = { &drbd_nl_primary, 0 },
2134 [ P_secondary ] = { &drbd_nl_secondary, 0 },
2135 [ P_disk_conf ] = { &drbd_nl_disk_conf, 0 },
2136 [ P_detach ] = { &drbd_nl_detach, 0 },
2137 [ P_net_conf ] = { &drbd_nl_net_conf, 0 },
2138 [ P_disconnect ] = { &drbd_nl_disconnect, 0 },
2139 [ P_resize ] = { &drbd_nl_resize, 0 },
2140 [ P_syncer_conf ] = { &drbd_nl_syncer_conf, 0 },
2141 [ P_invalidate ] = { &drbd_nl_invalidate, 0 },
2142 [ P_invalidate_peer ] = { &drbd_nl_invalidate_peer, 0 },
2143 [ P_pause_sync ] = { &drbd_nl_pause_sync, 0 },
2144 [ P_resume_sync ] = { &drbd_nl_resume_sync, 0 },
2145 [ P_suspend_io ] = { &drbd_nl_suspend_io, 0 },
2146 [ P_resume_io ] = { &drbd_nl_resume_io, 0 },
2147 [ P_outdate ] = { &drbd_nl_outdate, 0 },
2148 [ P_get_config ] = { &drbd_nl_get_config,
2149 sizeof(struct syncer_conf_tag_len_struct) +
2150 sizeof(struct disk_conf_tag_len_struct) +
2151 sizeof(struct net_conf_tag_len_struct) },
2152 [ P_get_state ] = { &drbd_nl_get_state,
2153 sizeof(struct get_state_tag_len_struct) +
2154 sizeof(struct sync_progress_tag_len_struct) },
2155 [ P_get_uuids ] = { &drbd_nl_get_uuids,
2156 sizeof(struct get_uuids_tag_len_struct) },
2157 [ P_get_timeout_flag ] = { &drbd_nl_get_timeout_flag,
2158 sizeof(struct get_timeout_flag_tag_len_struct)},
2159 [ P_start_ov ] = { &drbd_nl_start_ov, 0 },
2160 [ P_new_c_uuid ] = { &drbd_nl_new_c_uuid, 0 },
2161 };
2162
2163 static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp)
2164 {
2165 struct drbd_nl_cfg_req *nlp = (struct drbd_nl_cfg_req *)req->data;
2166 struct cn_handler_struct *cm;
2167 struct cn_msg *cn_reply;
2168 struct drbd_nl_cfg_reply *reply;
2169 struct drbd_conf *mdev;
2170 int retcode, rr;
2171 int reply_size = sizeof(struct cn_msg)
2172 + sizeof(struct drbd_nl_cfg_reply)
2173 + sizeof(short int);
2174
2175 if (!try_module_get(THIS_MODULE)) {
2176 printk(KERN_ERR "drbd: try_module_get() failed!\n");
2177 return;
2178 }
2179
2180 if (!cap_raised(current_cap(), CAP_SYS_ADMIN)) {
2181 retcode = ERR_PERM;
2182 goto fail;
2183 }
2184
2185 mdev = ensure_mdev(nlp->drbd_minor,
2186 (nlp->flags & DRBD_NL_CREATE_DEVICE));
2187 if (!mdev) {
2188 retcode = ERR_MINOR_INVALID;
2189 goto fail;
2190 }
2191
2192 if (nlp->packet_type >= P_nl_after_last_packet) {
2193 retcode = ERR_PACKET_NR;
2194 goto fail;
2195 }
2196
2197 cm = cnd_table + nlp->packet_type;
2198
2199 /* This may happen if packet number is 0: */
2200 if (cm->function == NULL) {
2201 retcode = ERR_PACKET_NR;
2202 goto fail;
2203 }
2204
2205 reply_size += cm->reply_body_size;
2206
2207 /* allocation not in the IO path, cqueue thread context */
2208 cn_reply = kmalloc(reply_size, GFP_KERNEL);
2209 if (!cn_reply) {
2210 retcode = ERR_NOMEM;
2211 goto fail;
2212 }
2213 reply = (struct drbd_nl_cfg_reply *) cn_reply->data;
2214
2215 reply->packet_type =
2216 cm->reply_body_size ? nlp->packet_type : P_nl_after_last_packet;
2217 reply->minor = nlp->drbd_minor;
2218 reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */
2219 /* reply->tag_list; might be modified by cm->function. */
2220
2221 rr = cm->function(mdev, nlp, reply);
2222
2223 cn_reply->id = req->id;
2224 cn_reply->seq = req->seq;
2225 cn_reply->ack = req->ack + 1;
2226 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + rr;
2227 cn_reply->flags = 0;
2228
2229 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL);
2230 if (rr && rr != -ESRCH)
2231 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2232
2233 kfree(cn_reply);
2234 module_put(THIS_MODULE);
2235 return;
2236 fail:
2237 drbd_nl_send_reply(req, retcode);
2238 module_put(THIS_MODULE);
2239 }
2240
2241 static atomic_t drbd_nl_seq = ATOMIC_INIT(2); /* two. */
2242
2243 static unsigned short *
2244 __tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data,
2245 unsigned short len, int nul_terminated)
2246 {
2247 unsigned short l = tag_descriptions[tag_number(tag)].max_len;
2248 len = (len < l) ? len : l;
2249 put_unaligned(tag, tl++);
2250 put_unaligned(len, tl++);
2251 memcpy(tl, data, len);
2252 tl = (unsigned short*)((char*)tl + len);
2253 if (nul_terminated)
2254 *((char*)tl - 1) = 0;
2255 return tl;
2256 }
2257
2258 static unsigned short *
2259 tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, int len)
2260 {
2261 return __tl_add_blob(tl, tag, data, len, 0);
2262 }
2263
2264 static unsigned short *
2265 tl_add_str(unsigned short *tl, enum drbd_tags tag, const char *str)
2266 {
2267 return __tl_add_blob(tl, tag, str, strlen(str)+1, 0);
2268 }
2269
2270 static unsigned short *
2271 tl_add_int(unsigned short *tl, enum drbd_tags tag, const void *val)
2272 {
2273 put_unaligned(tag, tl++);
2274 switch(tag_type(tag)) {
2275 case TT_INTEGER:
2276 put_unaligned(sizeof(int), tl++);
2277 put_unaligned(*(int *)val, (int *)tl);
2278 tl = (unsigned short*)((char*)tl+sizeof(int));
2279 break;
2280 case TT_INT64:
2281 put_unaligned(sizeof(u64), tl++);
2282 put_unaligned(*(u64 *)val, (u64 *)tl);
2283 tl = (unsigned short*)((char*)tl+sizeof(u64));
2284 break;
2285 default:
2286 /* someone did something stupid. */
2287 ;
2288 }
2289 return tl;
2290 }
2291
2292 void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state state)
2293 {
2294 char buffer[sizeof(struct cn_msg)+
2295 sizeof(struct drbd_nl_cfg_reply)+
2296 sizeof(struct get_state_tag_len_struct)+
2297 sizeof(short int)];
2298 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2299 struct drbd_nl_cfg_reply *reply =
2300 (struct drbd_nl_cfg_reply *)cn_reply->data;
2301 unsigned short *tl = reply->tag_list;
2302
2303 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2304
2305 tl = get_state_to_tags(mdev, (struct get_state *)&state, tl);
2306
2307 put_unaligned(TT_END, tl++); /* Close the tag list */
2308
2309 cn_reply->id.idx = CN_IDX_DRBD;
2310 cn_reply->id.val = CN_VAL_DRBD;
2311
2312 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2313 cn_reply->ack = 0; /* not used here. */
2314 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2315 (int)((char *)tl - (char *)reply->tag_list);
2316 cn_reply->flags = 0;
2317
2318 reply->packet_type = P_get_state;
2319 reply->minor = mdev_to_minor(mdev);
2320 reply->ret_code = NO_ERROR;
2321
2322 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2323 }
2324
2325 void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name)
2326 {
2327 char buffer[sizeof(struct cn_msg)+
2328 sizeof(struct drbd_nl_cfg_reply)+
2329 sizeof(struct call_helper_tag_len_struct)+
2330 sizeof(short int)];
2331 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2332 struct drbd_nl_cfg_reply *reply =
2333 (struct drbd_nl_cfg_reply *)cn_reply->data;
2334 unsigned short *tl = reply->tag_list;
2335
2336 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2337
2338 tl = tl_add_str(tl, T_helper, helper_name);
2339 put_unaligned(TT_END, tl++); /* Close the tag list */
2340
2341 cn_reply->id.idx = CN_IDX_DRBD;
2342 cn_reply->id.val = CN_VAL_DRBD;
2343
2344 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2345 cn_reply->ack = 0; /* not used here. */
2346 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2347 (int)((char *)tl - (char *)reply->tag_list);
2348 cn_reply->flags = 0;
2349
2350 reply->packet_type = P_call_helper;
2351 reply->minor = mdev_to_minor(mdev);
2352 reply->ret_code = NO_ERROR;
2353
2354 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2355 }
2356
2357 void drbd_bcast_ee(struct drbd_conf *mdev,
2358 const char *reason, const int dgs,
2359 const char* seen_hash, const char* calc_hash,
2360 const struct drbd_epoch_entry* e)
2361 {
2362 struct cn_msg *cn_reply;
2363 struct drbd_nl_cfg_reply *reply;
2364 unsigned short *tl;
2365 struct page *page;
2366 unsigned len;
2367
2368 if (!e)
2369 return;
2370 if (!reason || !reason[0])
2371 return;
2372
2373 /* apparently we have to memcpy twice, first to prepare the data for the
2374 * struct cn_msg, then within cn_netlink_send from the cn_msg to the
2375 * netlink skb. */
2376 /* receiver thread context, which is not in the writeout path (of this node),
2377 * but may be in the writeout path of the _other_ node.
2378 * GFP_NOIO to avoid potential "distributed deadlock". */
2379 cn_reply = kmalloc(
2380 sizeof(struct cn_msg)+
2381 sizeof(struct drbd_nl_cfg_reply)+
2382 sizeof(struct dump_ee_tag_len_struct)+
2383 sizeof(short int),
2384 GFP_NOIO);
2385
2386 if (!cn_reply) {
2387 dev_err(DEV, "could not kmalloc buffer for drbd_bcast_ee, sector %llu, size %u\n",
2388 (unsigned long long)e->sector, e->size);
2389 return;
2390 }
2391
2392 reply = (struct drbd_nl_cfg_reply*)cn_reply->data;
2393 tl = reply->tag_list;
2394
2395 tl = tl_add_str(tl, T_dump_ee_reason, reason);
2396 tl = tl_add_blob(tl, T_seen_digest, seen_hash, dgs);
2397 tl = tl_add_blob(tl, T_calc_digest, calc_hash, dgs);
2398 tl = tl_add_int(tl, T_ee_sector, &e->sector);
2399 tl = tl_add_int(tl, T_ee_block_id, &e->block_id);
2400
2401 put_unaligned(T_ee_data, tl++);
2402 put_unaligned(e->size, tl++);
2403
2404 len = e->size;
2405 page = e->pages;
2406 page_chain_for_each(page) {
2407 void *d = kmap_atomic(page, KM_USER0);
2408 unsigned l = min_t(unsigned, len, PAGE_SIZE);
2409 memcpy(tl, d, l);
2410 kunmap_atomic(d, KM_USER0);
2411 tl = (unsigned short*)((char*)tl + l);
2412 len -= l;
2413 }
2414 put_unaligned(TT_END, tl++); /* Close the tag list */
2415
2416 cn_reply->id.idx = CN_IDX_DRBD;
2417 cn_reply->id.val = CN_VAL_DRBD;
2418
2419 cn_reply->seq = atomic_add_return(1,&drbd_nl_seq);
2420 cn_reply->ack = 0; // not used here.
2421 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2422 (int)((char*)tl - (char*)reply->tag_list);
2423 cn_reply->flags = 0;
2424
2425 reply->packet_type = P_dump_ee;
2426 reply->minor = mdev_to_minor(mdev);
2427 reply->ret_code = NO_ERROR;
2428
2429 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2430 kfree(cn_reply);
2431 }
2432
2433 void drbd_bcast_sync_progress(struct drbd_conf *mdev)
2434 {
2435 char buffer[sizeof(struct cn_msg)+
2436 sizeof(struct drbd_nl_cfg_reply)+
2437 sizeof(struct sync_progress_tag_len_struct)+
2438 sizeof(short int)];
2439 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2440 struct drbd_nl_cfg_reply *reply =
2441 (struct drbd_nl_cfg_reply *)cn_reply->data;
2442 unsigned short *tl = reply->tag_list;
2443 unsigned long rs_left;
2444 unsigned int res;
2445
2446 /* no local ref, no bitmap, no syncer progress, no broadcast. */
2447 if (!get_ldev(mdev))
2448 return;
2449 drbd_get_syncer_progress(mdev, &rs_left, &res);
2450 put_ldev(mdev);
2451
2452 tl = tl_add_int(tl, T_sync_progress, &res);
2453 put_unaligned(TT_END, tl++); /* Close the tag list */
2454
2455 cn_reply->id.idx = CN_IDX_DRBD;
2456 cn_reply->id.val = CN_VAL_DRBD;
2457
2458 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2459 cn_reply->ack = 0; /* not used here. */
2460 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2461 (int)((char *)tl - (char *)reply->tag_list);
2462 cn_reply->flags = 0;
2463
2464 reply->packet_type = P_sync_progress;
2465 reply->minor = mdev_to_minor(mdev);
2466 reply->ret_code = NO_ERROR;
2467
2468 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2469 }
2470
2471 int __init drbd_nl_init(void)
2472 {
2473 static struct cb_id cn_id_drbd;
2474 int err, try=10;
2475
2476 cn_id_drbd.val = CN_VAL_DRBD;
2477 do {
2478 cn_id_drbd.idx = cn_idx;
2479 err = cn_add_callback(&cn_id_drbd, "cn_drbd", &drbd_connector_callback);
2480 if (!err)
2481 break;
2482 cn_idx = (cn_idx + CN_IDX_STEP);
2483 } while (try--);
2484
2485 if (err) {
2486 printk(KERN_ERR "drbd: cn_drbd failed to register\n");
2487 return err;
2488 }
2489
2490 return 0;
2491 }
2492
2493 void drbd_nl_cleanup(void)
2494 {
2495 static struct cb_id cn_id_drbd;
2496
2497 cn_id_drbd.idx = cn_idx;
2498 cn_id_drbd.val = CN_VAL_DRBD;
2499
2500 cn_del_callback(&cn_id_drbd);
2501 }
2502
2503 void drbd_nl_send_reply(struct cn_msg *req, int ret_code)
2504 {
2505 char buffer[sizeof(struct cn_msg)+sizeof(struct drbd_nl_cfg_reply)];
2506 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2507 struct drbd_nl_cfg_reply *reply =
2508 (struct drbd_nl_cfg_reply *)cn_reply->data;
2509 int rr;
2510
2511 cn_reply->id = req->id;
2512
2513 cn_reply->seq = req->seq;
2514 cn_reply->ack = req->ack + 1;
2515 cn_reply->len = sizeof(struct drbd_nl_cfg_reply);
2516 cn_reply->flags = 0;
2517
2518 reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor;
2519 reply->ret_code = ret_code;
2520
2521 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2522 if (rr && rr != -ESRCH)
2523 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2524 }
2525
CRIS linux kernel tree