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drbd: Run the fence-peer helper asynchronously
[deliverable/linux.git] / drivers / block / drbd / drbd_nl.c
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 dev_info(DEV, "helper command: %s %s %s\n", usermode_helper, cmd, mb);
176
177 drbd_bcast_ev_helper(mdev, cmd);
178 ret = call_usermodehelper(usermode_helper, argv, envp, 1);
179 if (ret)
180 dev_warn(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
181 usermode_helper, cmd, mb,
182 (ret >> 8) & 0xff, ret);
183 else
184 dev_info(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
185 usermode_helper, cmd, mb,
186 (ret >> 8) & 0xff, ret);
187
188 if (ret < 0) /* Ignore any ERRNOs we got. */
189 ret = 0;
190
191 return ret;
192 }
193
194 enum drbd_disk_state drbd_try_outdate_peer(struct drbd_conf *mdev)
195 {
196 char *ex_to_string;
197 int r;
198 enum drbd_disk_state nps;
199 enum drbd_fencing_p fp;
200
201 D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
202
203 if (get_ldev_if_state(mdev, D_CONSISTENT)) {
204 fp = mdev->ldev->dc.fencing;
205 put_ldev(mdev);
206 } else {
207 dev_warn(DEV, "Not fencing peer, I'm not even Consistent myself.\n");
208 return mdev->state.pdsk;
209 }
210
211 if (fp == FP_STONITH)
212 _drbd_request_state(mdev, NS(susp, 1), CS_WAIT_COMPLETE);
213
214 r = drbd_khelper(mdev, "fence-peer");
215
216 switch ((r>>8) & 0xff) {
217 case 3: /* peer is inconsistent */
218 ex_to_string = "peer is inconsistent or worse";
219 nps = D_INCONSISTENT;
220 break;
221 case 4: /* peer got outdated, or was already outdated */
222 ex_to_string = "peer was fenced";
223 nps = D_OUTDATED;
224 break;
225 case 5: /* peer was down */
226 if (mdev->state.disk == D_UP_TO_DATE) {
227 /* we will(have) create(d) a new UUID anyways... */
228 ex_to_string = "peer is unreachable, assumed to be dead";
229 nps = D_OUTDATED;
230 } else {
231 ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
232 nps = mdev->state.pdsk;
233 }
234 break;
235 case 6: /* Peer is primary, voluntarily outdate myself.
236 * This is useful when an unconnected R_SECONDARY is asked to
237 * become R_PRIMARY, but finds the other peer being active. */
238 ex_to_string = "peer is active";
239 dev_warn(DEV, "Peer is primary, outdating myself.\n");
240 nps = D_UNKNOWN;
241 _drbd_request_state(mdev, NS(disk, D_OUTDATED), CS_WAIT_COMPLETE);
242 break;
243 case 7:
244 if (fp != FP_STONITH)
245 dev_err(DEV, "fence-peer() = 7 && fencing != Stonith !!!\n");
246 ex_to_string = "peer was stonithed";
247 nps = D_OUTDATED;
248 break;
249 default:
250 /* The script is broken ... */
251 nps = D_UNKNOWN;
252 dev_err(DEV, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
253 return nps;
254 }
255
256 dev_info(DEV, "fence-peer helper returned %d (%s)\n",
257 (r>>8) & 0xff, ex_to_string);
258 return nps;
259 }
260
261 static int _try_outdate_peer_async(void *data)
262 {
263 struct drbd_conf *mdev = (struct drbd_conf *)data;
264 enum drbd_disk_state nps;
265
266 nps = drbd_try_outdate_peer(mdev);
267 drbd_request_state(mdev, NS(pdsk, nps));
268
269 return 0;
270 }
271
272 void drbd_try_outdate_peer_async(struct drbd_conf *mdev)
273 {
274 struct task_struct *opa;
275
276 opa = kthread_run(_try_outdate_peer_async, mdev, "drbd%d_a_helper", mdev_to_minor(mdev));
277 if (IS_ERR(opa))
278 dev_err(DEV, "out of mem, failed to invoke fence-peer helper\n");
279 }
280
281 int drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
282 {
283 const int max_tries = 4;
284 int r = 0;
285 int try = 0;
286 int forced = 0;
287 union drbd_state mask, val;
288 enum drbd_disk_state nps;
289
290 if (new_role == R_PRIMARY)
291 request_ping(mdev); /* Detect a dead peer ASAP */
292
293 mutex_lock(&mdev->state_mutex);
294
295 mask.i = 0; mask.role = R_MASK;
296 val.i = 0; val.role = new_role;
297
298 while (try++ < max_tries) {
299 r = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE);
300
301 /* in case we first succeeded to outdate,
302 * but now suddenly could establish a connection */
303 if (r == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
304 val.pdsk = 0;
305 mask.pdsk = 0;
306 continue;
307 }
308
309 if (r == SS_NO_UP_TO_DATE_DISK && force &&
310 (mdev->state.disk < D_UP_TO_DATE &&
311 mdev->state.disk >= D_INCONSISTENT)) {
312 mask.disk = D_MASK;
313 val.disk = D_UP_TO_DATE;
314 forced = 1;
315 continue;
316 }
317
318 if (r == SS_NO_UP_TO_DATE_DISK &&
319 mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) {
320 D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
321 nps = drbd_try_outdate_peer(mdev);
322
323 if (nps == D_OUTDATED || nps == D_INCONSISTENT) {
324 val.disk = D_UP_TO_DATE;
325 mask.disk = D_MASK;
326 }
327
328 val.pdsk = nps;
329 mask.pdsk = D_MASK;
330
331 continue;
332 }
333
334 if (r == SS_NOTHING_TO_DO)
335 goto fail;
336 if (r == SS_PRIMARY_NOP && mask.pdsk == 0) {
337 nps = drbd_try_outdate_peer(mdev);
338
339 if (force && nps > D_OUTDATED) {
340 dev_warn(DEV, "Forced into split brain situation!\n");
341 nps = D_OUTDATED;
342 }
343
344 mask.pdsk = D_MASK;
345 val.pdsk = nps;
346
347 continue;
348 }
349 if (r == SS_TWO_PRIMARIES) {
350 /* Maybe the peer is detected as dead very soon...
351 retry at most once more in this case. */
352 __set_current_state(TASK_INTERRUPTIBLE);
353 schedule_timeout((mdev->net_conf->ping_timeo+1)*HZ/10);
354 if (try < max_tries)
355 try = max_tries - 1;
356 continue;
357 }
358 if (r < SS_SUCCESS) {
359 r = _drbd_request_state(mdev, mask, val,
360 CS_VERBOSE + CS_WAIT_COMPLETE);
361 if (r < SS_SUCCESS)
362 goto fail;
363 }
364 break;
365 }
366
367 if (r < SS_SUCCESS)
368 goto fail;
369
370 if (forced)
371 dev_warn(DEV, "Forced to consider local data as UpToDate!\n");
372
373 /* Wait until nothing is on the fly :) */
374 wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0);
375
376 if (new_role == R_SECONDARY) {
377 set_disk_ro(mdev->vdisk, TRUE);
378 if (get_ldev(mdev)) {
379 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
380 put_ldev(mdev);
381 }
382 } else {
383 if (get_net_conf(mdev)) {
384 mdev->net_conf->want_lose = 0;
385 put_net_conf(mdev);
386 }
387 set_disk_ro(mdev->vdisk, FALSE);
388 if (get_ldev(mdev)) {
389 if (((mdev->state.conn < C_CONNECTED ||
390 mdev->state.pdsk <= D_FAILED)
391 && mdev->ldev->md.uuid[UI_BITMAP] == 0) || forced)
392 drbd_uuid_new_current(mdev);
393
394 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
395 put_ldev(mdev);
396 }
397 }
398
399 if ((new_role == R_SECONDARY) && get_ldev(mdev)) {
400 drbd_al_to_on_disk_bm(mdev);
401 put_ldev(mdev);
402 }
403
404 if (mdev->state.conn >= C_WF_REPORT_PARAMS) {
405 /* if this was forced, we should consider sync */
406 if (forced)
407 drbd_send_uuids(mdev);
408 drbd_send_state(mdev);
409 }
410
411 drbd_md_sync(mdev);
412
413 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
414 fail:
415 mutex_unlock(&mdev->state_mutex);
416 return r;
417 }
418
419
420 static int drbd_nl_primary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
421 struct drbd_nl_cfg_reply *reply)
422 {
423 struct primary primary_args;
424
425 memset(&primary_args, 0, sizeof(struct primary));
426 if (!primary_from_tags(mdev, nlp->tag_list, &primary_args)) {
427 reply->ret_code = ERR_MANDATORY_TAG;
428 return 0;
429 }
430
431 reply->ret_code =
432 drbd_set_role(mdev, R_PRIMARY, primary_args.primary_force);
433
434 return 0;
435 }
436
437 static int drbd_nl_secondary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
438 struct drbd_nl_cfg_reply *reply)
439 {
440 reply->ret_code = drbd_set_role(mdev, R_SECONDARY, 0);
441
442 return 0;
443 }
444
445 /* initializes the md.*_offset members, so we are able to find
446 * the on disk meta data */
447 static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
448 struct drbd_backing_dev *bdev)
449 {
450 sector_t md_size_sect = 0;
451 switch (bdev->dc.meta_dev_idx) {
452 default:
453 /* v07 style fixed size indexed meta data */
454 bdev->md.md_size_sect = MD_RESERVED_SECT;
455 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
456 bdev->md.al_offset = MD_AL_OFFSET;
457 bdev->md.bm_offset = MD_BM_OFFSET;
458 break;
459 case DRBD_MD_INDEX_FLEX_EXT:
460 /* just occupy the full device; unit: sectors */
461 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
462 bdev->md.md_offset = 0;
463 bdev->md.al_offset = MD_AL_OFFSET;
464 bdev->md.bm_offset = MD_BM_OFFSET;
465 break;
466 case DRBD_MD_INDEX_INTERNAL:
467 case DRBD_MD_INDEX_FLEX_INT:
468 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
469 /* al size is still fixed */
470 bdev->md.al_offset = -MD_AL_MAX_SIZE;
471 /* we need (slightly less than) ~ this much bitmap sectors: */
472 md_size_sect = drbd_get_capacity(bdev->backing_bdev);
473 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
474 md_size_sect = BM_SECT_TO_EXT(md_size_sect);
475 md_size_sect = ALIGN(md_size_sect, 8);
476
477 /* plus the "drbd meta data super block",
478 * and the activity log; */
479 md_size_sect += MD_BM_OFFSET;
480
481 bdev->md.md_size_sect = md_size_sect;
482 /* bitmap offset is adjusted by 'super' block size */
483 bdev->md.bm_offset = -md_size_sect + MD_AL_OFFSET;
484 break;
485 }
486 }
487
488 char *ppsize(char *buf, unsigned long long size)
489 {
490 /* Needs 9 bytes at max. */
491 static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
492 int base = 0;
493 while (size >= 10000) {
494 /* shift + round */
495 size = (size >> 10) + !!(size & (1<<9));
496 base++;
497 }
498 sprintf(buf, "%lu %cB", (long)size, units[base]);
499
500 return buf;
501 }
502
503 /* there is still a theoretical deadlock when called from receiver
504 * on an D_INCONSISTENT R_PRIMARY:
505 * remote READ does inc_ap_bio, receiver would need to receive answer
506 * packet from remote to dec_ap_bio again.
507 * receiver receive_sizes(), comes here,
508 * waits for ap_bio_cnt == 0. -> deadlock.
509 * but this cannot happen, actually, because:
510 * R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable
511 * (not connected, or bad/no disk on peer):
512 * see drbd_fail_request_early, ap_bio_cnt is zero.
513 * R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET:
514 * peer may not initiate a resize.
515 */
516 void drbd_suspend_io(struct drbd_conf *mdev)
517 {
518 set_bit(SUSPEND_IO, &mdev->flags);
519 if (mdev->state.susp)
520 return;
521 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
522 }
523
524 void drbd_resume_io(struct drbd_conf *mdev)
525 {
526 clear_bit(SUSPEND_IO, &mdev->flags);
527 wake_up(&mdev->misc_wait);
528 }
529
530 /**
531 * drbd_determine_dev_size() - Sets the right device size obeying all constraints
532 * @mdev: DRBD device.
533 *
534 * Returns 0 on success, negative return values indicate errors.
535 * You should call drbd_md_sync() after calling this function.
536 */
537 enum determine_dev_size drbd_determin_dev_size(struct drbd_conf *mdev, enum dds_flags flags) __must_hold(local)
538 {
539 sector_t prev_first_sect, prev_size; /* previous meta location */
540 sector_t la_size;
541 sector_t size;
542 char ppb[10];
543
544 int md_moved, la_size_changed;
545 enum determine_dev_size rv = unchanged;
546
547 /* race:
548 * application request passes inc_ap_bio,
549 * but then cannot get an AL-reference.
550 * this function later may wait on ap_bio_cnt == 0. -> deadlock.
551 *
552 * to avoid that:
553 * Suspend IO right here.
554 * still lock the act_log to not trigger ASSERTs there.
555 */
556 drbd_suspend_io(mdev);
557
558 /* no wait necessary anymore, actually we could assert that */
559 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
560
561 prev_first_sect = drbd_md_first_sector(mdev->ldev);
562 prev_size = mdev->ldev->md.md_size_sect;
563 la_size = mdev->ldev->md.la_size_sect;
564
565 /* TODO: should only be some assert here, not (re)init... */
566 drbd_md_set_sector_offsets(mdev, mdev->ldev);
567
568 size = drbd_new_dev_size(mdev, mdev->ldev, flags & DDSF_FORCED);
569
570 if (drbd_get_capacity(mdev->this_bdev) != size ||
571 drbd_bm_capacity(mdev) != size) {
572 int err;
573 err = drbd_bm_resize(mdev, size, !(flags & DDSF_NO_RESYNC));
574 if (unlikely(err)) {
575 /* currently there is only one error: ENOMEM! */
576 size = drbd_bm_capacity(mdev)>>1;
577 if (size == 0) {
578 dev_err(DEV, "OUT OF MEMORY! "
579 "Could not allocate bitmap!\n");
580 } else {
581 dev_err(DEV, "BM resizing failed. "
582 "Leaving size unchanged at size = %lu KB\n",
583 (unsigned long)size);
584 }
585 rv = dev_size_error;
586 }
587 /* racy, see comments above. */
588 drbd_set_my_capacity(mdev, size);
589 mdev->ldev->md.la_size_sect = size;
590 dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1),
591 (unsigned long long)size>>1);
592 }
593 if (rv == dev_size_error)
594 goto out;
595
596 la_size_changed = (la_size != mdev->ldev->md.la_size_sect);
597
598 md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev)
599 || prev_size != mdev->ldev->md.md_size_sect;
600
601 if (la_size_changed || md_moved) {
602 drbd_al_shrink(mdev); /* All extents inactive. */
603 dev_info(DEV, "Writing the whole bitmap, %s\n",
604 la_size_changed && md_moved ? "size changed and md moved" :
605 la_size_changed ? "size changed" : "md moved");
606 rv = drbd_bitmap_io(mdev, &drbd_bm_write, "size changed"); /* does drbd_resume_io() ! */
607 drbd_md_mark_dirty(mdev);
608 }
609
610 if (size > la_size)
611 rv = grew;
612 if (size < la_size)
613 rv = shrunk;
614 out:
615 lc_unlock(mdev->act_log);
616 wake_up(&mdev->al_wait);
617 drbd_resume_io(mdev);
618
619 return rv;
620 }
621
622 sector_t
623 drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev, int assume_peer_has_space)
624 {
625 sector_t p_size = mdev->p_size; /* partner's disk size. */
626 sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */
627 sector_t m_size; /* my size */
628 sector_t u_size = bdev->dc.disk_size; /* size requested by user. */
629 sector_t size = 0;
630
631 m_size = drbd_get_max_capacity(bdev);
632
633 if (mdev->state.conn < C_CONNECTED && assume_peer_has_space) {
634 dev_warn(DEV, "Resize while not connected was forced by the user!\n");
635 p_size = m_size;
636 }
637
638 if (p_size && m_size) {
639 size = min_t(sector_t, p_size, m_size);
640 } else {
641 if (la_size) {
642 size = la_size;
643 if (m_size && m_size < size)
644 size = m_size;
645 if (p_size && p_size < size)
646 size = p_size;
647 } else {
648 if (m_size)
649 size = m_size;
650 if (p_size)
651 size = p_size;
652 }
653 }
654
655 if (size == 0)
656 dev_err(DEV, "Both nodes diskless!\n");
657
658 if (u_size) {
659 if (u_size > size)
660 dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n",
661 (unsigned long)u_size>>1, (unsigned long)size>>1);
662 else
663 size = u_size;
664 }
665
666 return size;
667 }
668
669 /**
670 * drbd_check_al_size() - Ensures that the AL is of the right size
671 * @mdev: DRBD device.
672 *
673 * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
674 * failed, and 0 on success. You should call drbd_md_sync() after you called
675 * this function.
676 */
677 static int drbd_check_al_size(struct drbd_conf *mdev)
678 {
679 struct lru_cache *n, *t;
680 struct lc_element *e;
681 unsigned int in_use;
682 int i;
683
684 ERR_IF(mdev->sync_conf.al_extents < 7)
685 mdev->sync_conf.al_extents = 127;
686
687 if (mdev->act_log &&
688 mdev->act_log->nr_elements == mdev->sync_conf.al_extents)
689 return 0;
690
691 in_use = 0;
692 t = mdev->act_log;
693 n = lc_create("act_log", drbd_al_ext_cache,
694 mdev->sync_conf.al_extents, sizeof(struct lc_element), 0);
695
696 if (n == NULL) {
697 dev_err(DEV, "Cannot allocate act_log lru!\n");
698 return -ENOMEM;
699 }
700 spin_lock_irq(&mdev->al_lock);
701 if (t) {
702 for (i = 0; i < t->nr_elements; i++) {
703 e = lc_element_by_index(t, i);
704 if (e->refcnt)
705 dev_err(DEV, "refcnt(%d)==%d\n",
706 e->lc_number, e->refcnt);
707 in_use += e->refcnt;
708 }
709 }
710 if (!in_use)
711 mdev->act_log = n;
712 spin_unlock_irq(&mdev->al_lock);
713 if (in_use) {
714 dev_err(DEV, "Activity log still in use!\n");
715 lc_destroy(n);
716 return -EBUSY;
717 } else {
718 if (t)
719 lc_destroy(t);
720 }
721 drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */
722 return 0;
723 }
724
725 void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_seg_s) __must_hold(local)
726 {
727 struct request_queue * const q = mdev->rq_queue;
728 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
729 int max_segments = mdev->ldev->dc.max_bio_bvecs;
730
731 max_seg_s = min(queue_max_sectors(b) * queue_logical_block_size(b), max_seg_s);
732
733 blk_queue_max_hw_sectors(q, max_seg_s >> 9);
734 blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
735 blk_queue_max_segment_size(q, max_seg_s);
736 blk_queue_logical_block_size(q, 512);
737 blk_queue_segment_boundary(q, PAGE_SIZE-1);
738 blk_stack_limits(&q->limits, &b->limits, 0);
739
740 if (b->merge_bvec_fn)
741 dev_warn(DEV, "Backing device's merge_bvec_fn() = %p\n",
742 b->merge_bvec_fn);
743 dev_info(DEV, "max_segment_size ( = BIO size ) = %u\n", queue_max_segment_size(q));
744
745 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
746 dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
747 q->backing_dev_info.ra_pages,
748 b->backing_dev_info.ra_pages);
749 q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
750 }
751 }
752
753 /* serialize deconfig (worker exiting, doing cleanup)
754 * and reconfig (drbdsetup disk, drbdsetup net)
755 *
756 * wait for a potentially exiting worker, then restart it,
757 * or start a new one.
758 */
759 static void drbd_reconfig_start(struct drbd_conf *mdev)
760 {
761 wait_event(mdev->state_wait, !test_and_set_bit(CONFIG_PENDING, &mdev->flags));
762 wait_event(mdev->state_wait, !test_bit(DEVICE_DYING, &mdev->flags));
763 drbd_thread_start(&mdev->worker);
764 }
765
766 /* if still unconfigured, stops worker again.
767 * if configured now, clears CONFIG_PENDING.
768 * wakes potential waiters */
769 static void drbd_reconfig_done(struct drbd_conf *mdev)
770 {
771 spin_lock_irq(&mdev->req_lock);
772 if (mdev->state.disk == D_DISKLESS &&
773 mdev->state.conn == C_STANDALONE &&
774 mdev->state.role == R_SECONDARY) {
775 set_bit(DEVICE_DYING, &mdev->flags);
776 drbd_thread_stop_nowait(&mdev->worker);
777 } else
778 clear_bit(CONFIG_PENDING, &mdev->flags);
779 spin_unlock_irq(&mdev->req_lock);
780 wake_up(&mdev->state_wait);
781 }
782
783 /* does always return 0;
784 * interesting return code is in reply->ret_code */
785 static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
786 struct drbd_nl_cfg_reply *reply)
787 {
788 enum drbd_ret_codes retcode;
789 enum determine_dev_size dd;
790 sector_t max_possible_sectors;
791 sector_t min_md_device_sectors;
792 struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
793 struct inode *inode, *inode2;
794 struct lru_cache *resync_lru = NULL;
795 union drbd_state ns, os;
796 int rv;
797 int cp_discovered = 0;
798 int logical_block_size;
799
800 drbd_reconfig_start(mdev);
801
802 /* if you want to reconfigure, please tear down first */
803 if (mdev->state.disk > D_DISKLESS) {
804 retcode = ERR_DISK_CONFIGURED;
805 goto fail;
806 }
807
808 /* allocation not in the IO path, cqueue thread context */
809 nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
810 if (!nbc) {
811 retcode = ERR_NOMEM;
812 goto fail;
813 }
814
815 nbc->dc.disk_size = DRBD_DISK_SIZE_SECT_DEF;
816 nbc->dc.on_io_error = DRBD_ON_IO_ERROR_DEF;
817 nbc->dc.fencing = DRBD_FENCING_DEF;
818 nbc->dc.max_bio_bvecs = DRBD_MAX_BIO_BVECS_DEF;
819
820 if (!disk_conf_from_tags(mdev, nlp->tag_list, &nbc->dc)) {
821 retcode = ERR_MANDATORY_TAG;
822 goto fail;
823 }
824
825 if (nbc->dc.meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
826 retcode = ERR_MD_IDX_INVALID;
827 goto fail;
828 }
829
830 if (get_net_conf(mdev)) {
831 int prot = mdev->net_conf->wire_protocol;
832 put_net_conf(mdev);
833 if (nbc->dc.fencing == FP_STONITH && prot == DRBD_PROT_A) {
834 retcode = ERR_STONITH_AND_PROT_A;
835 goto fail;
836 }
837 }
838
839 nbc->lo_file = filp_open(nbc->dc.backing_dev, O_RDWR, 0);
840 if (IS_ERR(nbc->lo_file)) {
841 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev,
842 PTR_ERR(nbc->lo_file));
843 nbc->lo_file = NULL;
844 retcode = ERR_OPEN_DISK;
845 goto fail;
846 }
847
848 inode = nbc->lo_file->f_dentry->d_inode;
849
850 if (!S_ISBLK(inode->i_mode)) {
851 retcode = ERR_DISK_NOT_BDEV;
852 goto fail;
853 }
854
855 nbc->md_file = filp_open(nbc->dc.meta_dev, O_RDWR, 0);
856 if (IS_ERR(nbc->md_file)) {
857 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev,
858 PTR_ERR(nbc->md_file));
859 nbc->md_file = NULL;
860 retcode = ERR_OPEN_MD_DISK;
861 goto fail;
862 }
863
864 inode2 = nbc->md_file->f_dentry->d_inode;
865
866 if (!S_ISBLK(inode2->i_mode)) {
867 retcode = ERR_MD_NOT_BDEV;
868 goto fail;
869 }
870
871 nbc->backing_bdev = inode->i_bdev;
872 if (bd_claim(nbc->backing_bdev, mdev)) {
873 printk(KERN_ERR "drbd: bd_claim(%p,%p); failed [%p;%p;%u]\n",
874 nbc->backing_bdev, mdev,
875 nbc->backing_bdev->bd_holder,
876 nbc->backing_bdev->bd_contains->bd_holder,
877 nbc->backing_bdev->bd_holders);
878 retcode = ERR_BDCLAIM_DISK;
879 goto fail;
880 }
881
882 resync_lru = lc_create("resync", drbd_bm_ext_cache,
883 61, sizeof(struct bm_extent),
884 offsetof(struct bm_extent, lce));
885 if (!resync_lru) {
886 retcode = ERR_NOMEM;
887 goto release_bdev_fail;
888 }
889
890 /* meta_dev_idx >= 0: external fixed size,
891 * possibly multiple drbd sharing one meta device.
892 * TODO in that case, paranoia check that [md_bdev, meta_dev_idx] is
893 * not yet used by some other drbd minor!
894 * (if you use drbd.conf + drbdadm,
895 * that should check it for you already; but if you don't, or someone
896 * fooled it, we need to double check here) */
897 nbc->md_bdev = inode2->i_bdev;
898 if (bd_claim(nbc->md_bdev, (nbc->dc.meta_dev_idx < 0) ? (void *)mdev
899 : (void *) drbd_m_holder)) {
900 retcode = ERR_BDCLAIM_MD_DISK;
901 goto release_bdev_fail;
902 }
903
904 if ((nbc->backing_bdev == nbc->md_bdev) !=
905 (nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
906 nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
907 retcode = ERR_MD_IDX_INVALID;
908 goto release_bdev2_fail;
909 }
910
911 /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
912 drbd_md_set_sector_offsets(mdev, nbc);
913
914 if (drbd_get_max_capacity(nbc) < nbc->dc.disk_size) {
915 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
916 (unsigned long long) drbd_get_max_capacity(nbc),
917 (unsigned long long) nbc->dc.disk_size);
918 retcode = ERR_DISK_TO_SMALL;
919 goto release_bdev2_fail;
920 }
921
922 if (nbc->dc.meta_dev_idx < 0) {
923 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
924 /* at least one MB, otherwise it does not make sense */
925 min_md_device_sectors = (2<<10);
926 } else {
927 max_possible_sectors = DRBD_MAX_SECTORS;
928 min_md_device_sectors = MD_RESERVED_SECT * (nbc->dc.meta_dev_idx + 1);
929 }
930
931 if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
932 retcode = ERR_MD_DISK_TO_SMALL;
933 dev_warn(DEV, "refusing attach: md-device too small, "
934 "at least %llu sectors needed for this meta-disk type\n",
935 (unsigned long long) min_md_device_sectors);
936 goto release_bdev2_fail;
937 }
938
939 /* Make sure the new disk is big enough
940 * (we may currently be R_PRIMARY with no local disk...) */
941 if (drbd_get_max_capacity(nbc) <
942 drbd_get_capacity(mdev->this_bdev)) {
943 retcode = ERR_DISK_TO_SMALL;
944 goto release_bdev2_fail;
945 }
946
947 nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
948
949 if (nbc->known_size > max_possible_sectors) {
950 dev_warn(DEV, "==> truncating very big lower level device "
951 "to currently maximum possible %llu sectors <==\n",
952 (unsigned long long) max_possible_sectors);
953 if (nbc->dc.meta_dev_idx >= 0)
954 dev_warn(DEV, "==>> using internal or flexible "
955 "meta data may help <<==\n");
956 }
957
958 drbd_suspend_io(mdev);
959 /* also wait for the last barrier ack. */
960 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt));
961 /* and for any other previously queued work */
962 drbd_flush_workqueue(mdev);
963
964 retcode = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
965 drbd_resume_io(mdev);
966 if (retcode < SS_SUCCESS)
967 goto release_bdev2_fail;
968
969 if (!get_ldev_if_state(mdev, D_ATTACHING))
970 goto force_diskless;
971
972 drbd_md_set_sector_offsets(mdev, nbc);
973
974 /* allocate a second IO page if logical_block_size != 512 */
975 logical_block_size = bdev_logical_block_size(nbc->md_bdev);
976 if (logical_block_size == 0)
977 logical_block_size = MD_SECTOR_SIZE;
978
979 if (logical_block_size != MD_SECTOR_SIZE) {
980 if (!mdev->md_io_tmpp) {
981 struct page *page = alloc_page(GFP_NOIO);
982 if (!page)
983 goto force_diskless_dec;
984
985 dev_warn(DEV, "Meta data's bdev logical_block_size = %d != %d\n",
986 logical_block_size, MD_SECTOR_SIZE);
987 dev_warn(DEV, "Workaround engaged (has performance impact).\n");
988
989 mdev->md_io_tmpp = page;
990 }
991 }
992
993 if (!mdev->bitmap) {
994 if (drbd_bm_init(mdev)) {
995 retcode = ERR_NOMEM;
996 goto force_diskless_dec;
997 }
998 }
999
1000 retcode = drbd_md_read(mdev, nbc);
1001 if (retcode != NO_ERROR)
1002 goto force_diskless_dec;
1003
1004 if (mdev->state.conn < C_CONNECTED &&
1005 mdev->state.role == R_PRIMARY &&
1006 (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
1007 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
1008 (unsigned long long)mdev->ed_uuid);
1009 retcode = ERR_DATA_NOT_CURRENT;
1010 goto force_diskless_dec;
1011 }
1012
1013 /* Since we are diskless, fix the activity log first... */
1014 if (drbd_check_al_size(mdev)) {
1015 retcode = ERR_NOMEM;
1016 goto force_diskless_dec;
1017 }
1018
1019 /* Prevent shrinking of consistent devices ! */
1020 if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
1021 drbd_new_dev_size(mdev, nbc, 0) < nbc->md.la_size_sect) {
1022 dev_warn(DEV, "refusing to truncate a consistent device\n");
1023 retcode = ERR_DISK_TO_SMALL;
1024 goto force_diskless_dec;
1025 }
1026
1027 if (!drbd_al_read_log(mdev, nbc)) {
1028 retcode = ERR_IO_MD_DISK;
1029 goto force_diskless_dec;
1030 }
1031
1032 /* Reset the "barriers don't work" bits here, then force meta data to
1033 * be written, to ensure we determine if barriers are supported. */
1034 if (nbc->dc.no_md_flush)
1035 set_bit(MD_NO_BARRIER, &mdev->flags);
1036 else
1037 clear_bit(MD_NO_BARRIER, &mdev->flags);
1038
1039 /* Point of no return reached.
1040 * Devices and memory are no longer released by error cleanup below.
1041 * now mdev takes over responsibility, and the state engine should
1042 * clean it up somewhere. */
1043 D_ASSERT(mdev->ldev == NULL);
1044 mdev->ldev = nbc;
1045 mdev->resync = resync_lru;
1046 nbc = NULL;
1047 resync_lru = NULL;
1048
1049 mdev->write_ordering = WO_bio_barrier;
1050 drbd_bump_write_ordering(mdev, WO_bio_barrier);
1051
1052 if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
1053 set_bit(CRASHED_PRIMARY, &mdev->flags);
1054 else
1055 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1056
1057 if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1058 !(mdev->state.role == R_PRIMARY && mdev->state.susp &&
1059 mdev->sync_conf.on_no_data == OND_SUSPEND_IO)) {
1060 set_bit(CRASHED_PRIMARY, &mdev->flags);
1061 cp_discovered = 1;
1062 }
1063
1064 mdev->send_cnt = 0;
1065 mdev->recv_cnt = 0;
1066 mdev->read_cnt = 0;
1067 mdev->writ_cnt = 0;
1068
1069 drbd_setup_queue_param(mdev, DRBD_MAX_SEGMENT_SIZE);
1070
1071 /* If I am currently not R_PRIMARY,
1072 * but meta data primary indicator is set,
1073 * I just now recover from a hard crash,
1074 * and have been R_PRIMARY before that crash.
1075 *
1076 * Now, if I had no connection before that crash
1077 * (have been degraded R_PRIMARY), chances are that
1078 * I won't find my peer now either.
1079 *
1080 * In that case, and _only_ in that case,
1081 * we use the degr-wfc-timeout instead of the default,
1082 * so we can automatically recover from a crash of a
1083 * degraded but active "cluster" after a certain timeout.
1084 */
1085 clear_bit(USE_DEGR_WFC_T, &mdev->flags);
1086 if (mdev->state.role != R_PRIMARY &&
1087 drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1088 !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
1089 set_bit(USE_DEGR_WFC_T, &mdev->flags);
1090
1091 dd = drbd_determin_dev_size(mdev, 0);
1092 if (dd == dev_size_error) {
1093 retcode = ERR_NOMEM_BITMAP;
1094 goto force_diskless_dec;
1095 } else if (dd == grew)
1096 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
1097
1098 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
1099 dev_info(DEV, "Assuming that all blocks are out of sync "
1100 "(aka FullSync)\n");
1101 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from attaching")) {
1102 retcode = ERR_IO_MD_DISK;
1103 goto force_diskless_dec;
1104 }
1105 } else {
1106 if (drbd_bitmap_io(mdev, &drbd_bm_read, "read from attaching") < 0) {
1107 retcode = ERR_IO_MD_DISK;
1108 goto force_diskless_dec;
1109 }
1110 }
1111
1112 if (cp_discovered) {
1113 drbd_al_apply_to_bm(mdev);
1114 drbd_al_to_on_disk_bm(mdev);
1115 }
1116
1117 spin_lock_irq(&mdev->req_lock);
1118 os = mdev->state;
1119 ns.i = os.i;
1120 /* If MDF_CONSISTENT is not set go into inconsistent state,
1121 otherwise investigate MDF_WasUpToDate...
1122 If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1123 otherwise into D_CONSISTENT state.
1124 */
1125 if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
1126 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
1127 ns.disk = D_CONSISTENT;
1128 else
1129 ns.disk = D_OUTDATED;
1130 } else {
1131 ns.disk = D_INCONSISTENT;
1132 }
1133
1134 if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
1135 ns.pdsk = D_OUTDATED;
1136
1137 if ( ns.disk == D_CONSISTENT &&
1138 (ns.pdsk == D_OUTDATED || mdev->ldev->dc.fencing == FP_DONT_CARE))
1139 ns.disk = D_UP_TO_DATE;
1140
1141 /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1142 MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1143 this point, because drbd_request_state() modifies these
1144 flags. */
1145
1146 /* In case we are C_CONNECTED postpone any decision on the new disk
1147 state after the negotiation phase. */
1148 if (mdev->state.conn == C_CONNECTED) {
1149 mdev->new_state_tmp.i = ns.i;
1150 ns.i = os.i;
1151 ns.disk = D_NEGOTIATING;
1152
1153 /* We expect to receive up-to-date UUIDs soon.
1154 To avoid a race in receive_state, free p_uuid while
1155 holding req_lock. I.e. atomic with the state change */
1156 kfree(mdev->p_uuid);
1157 mdev->p_uuid = NULL;
1158 }
1159
1160 rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
1161 ns = mdev->state;
1162 spin_unlock_irq(&mdev->req_lock);
1163
1164 if (rv < SS_SUCCESS)
1165 goto force_diskless_dec;
1166
1167 if (mdev->state.role == R_PRIMARY)
1168 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
1169 else
1170 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1171
1172 drbd_md_mark_dirty(mdev);
1173 drbd_md_sync(mdev);
1174
1175 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1176 put_ldev(mdev);
1177 reply->ret_code = retcode;
1178 drbd_reconfig_done(mdev);
1179 return 0;
1180
1181 force_diskless_dec:
1182 put_ldev(mdev);
1183 force_diskless:
1184 drbd_force_state(mdev, NS(disk, D_DISKLESS));
1185 drbd_md_sync(mdev);
1186 release_bdev2_fail:
1187 if (nbc)
1188 bd_release(nbc->md_bdev);
1189 release_bdev_fail:
1190 if (nbc)
1191 bd_release(nbc->backing_bdev);
1192 fail:
1193 if (nbc) {
1194 if (nbc->lo_file)
1195 fput(nbc->lo_file);
1196 if (nbc->md_file)
1197 fput(nbc->md_file);
1198 kfree(nbc);
1199 }
1200 lc_destroy(resync_lru);
1201
1202 reply->ret_code = retcode;
1203 drbd_reconfig_done(mdev);
1204 return 0;
1205 }
1206
1207 static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1208 struct drbd_nl_cfg_reply *reply)
1209 {
1210 reply->ret_code = drbd_request_state(mdev, NS(disk, D_DISKLESS));
1211 return 0;
1212 }
1213
1214 static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1215 struct drbd_nl_cfg_reply *reply)
1216 {
1217 int i, ns;
1218 enum drbd_ret_codes retcode;
1219 struct net_conf *new_conf = NULL;
1220 struct crypto_hash *tfm = NULL;
1221 struct crypto_hash *integrity_w_tfm = NULL;
1222 struct crypto_hash *integrity_r_tfm = NULL;
1223 struct hlist_head *new_tl_hash = NULL;
1224 struct hlist_head *new_ee_hash = NULL;
1225 struct drbd_conf *odev;
1226 char hmac_name[CRYPTO_MAX_ALG_NAME];
1227 void *int_dig_out = NULL;
1228 void *int_dig_in = NULL;
1229 void *int_dig_vv = NULL;
1230 struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr;
1231
1232 drbd_reconfig_start(mdev);
1233
1234 if (mdev->state.conn > C_STANDALONE) {
1235 retcode = ERR_NET_CONFIGURED;
1236 goto fail;
1237 }
1238
1239 /* allocation not in the IO path, cqueue thread context */
1240 new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
1241 if (!new_conf) {
1242 retcode = ERR_NOMEM;
1243 goto fail;
1244 }
1245
1246 new_conf->timeout = DRBD_TIMEOUT_DEF;
1247 new_conf->try_connect_int = DRBD_CONNECT_INT_DEF;
1248 new_conf->ping_int = DRBD_PING_INT_DEF;
1249 new_conf->max_epoch_size = DRBD_MAX_EPOCH_SIZE_DEF;
1250 new_conf->max_buffers = DRBD_MAX_BUFFERS_DEF;
1251 new_conf->unplug_watermark = DRBD_UNPLUG_WATERMARK_DEF;
1252 new_conf->sndbuf_size = DRBD_SNDBUF_SIZE_DEF;
1253 new_conf->rcvbuf_size = DRBD_RCVBUF_SIZE_DEF;
1254 new_conf->ko_count = DRBD_KO_COUNT_DEF;
1255 new_conf->after_sb_0p = DRBD_AFTER_SB_0P_DEF;
1256 new_conf->after_sb_1p = DRBD_AFTER_SB_1P_DEF;
1257 new_conf->after_sb_2p = DRBD_AFTER_SB_2P_DEF;
1258 new_conf->want_lose = 0;
1259 new_conf->two_primaries = 0;
1260 new_conf->wire_protocol = DRBD_PROT_C;
1261 new_conf->ping_timeo = DRBD_PING_TIMEO_DEF;
1262 new_conf->rr_conflict = DRBD_RR_CONFLICT_DEF;
1263
1264 if (!net_conf_from_tags(mdev, nlp->tag_list, new_conf)) {
1265 retcode = ERR_MANDATORY_TAG;
1266 goto fail;
1267 }
1268
1269 if (new_conf->two_primaries
1270 && (new_conf->wire_protocol != DRBD_PROT_C)) {
1271 retcode = ERR_NOT_PROTO_C;
1272 goto fail;
1273 }
1274
1275 if (get_ldev(mdev)) {
1276 enum drbd_fencing_p fp = mdev->ldev->dc.fencing;
1277 put_ldev(mdev);
1278 if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH) {
1279 retcode = ERR_STONITH_AND_PROT_A;
1280 goto fail;
1281 }
1282 }
1283
1284 if (mdev->state.role == R_PRIMARY && new_conf->want_lose) {
1285 retcode = ERR_DISCARD;
1286 goto fail;
1287 }
1288
1289 retcode = NO_ERROR;
1290
1291 new_my_addr = (struct sockaddr *)&new_conf->my_addr;
1292 new_peer_addr = (struct sockaddr *)&new_conf->peer_addr;
1293 for (i = 0; i < minor_count; i++) {
1294 odev = minor_to_mdev(i);
1295 if (!odev || odev == mdev)
1296 continue;
1297 if (get_net_conf(odev)) {
1298 taken_addr = (struct sockaddr *)&odev->net_conf->my_addr;
1299 if (new_conf->my_addr_len == odev->net_conf->my_addr_len &&
1300 !memcmp(new_my_addr, taken_addr, new_conf->my_addr_len))
1301 retcode = ERR_LOCAL_ADDR;
1302
1303 taken_addr = (struct sockaddr *)&odev->net_conf->peer_addr;
1304 if (new_conf->peer_addr_len == odev->net_conf->peer_addr_len &&
1305 !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len))
1306 retcode = ERR_PEER_ADDR;
1307
1308 put_net_conf(odev);
1309 if (retcode != NO_ERROR)
1310 goto fail;
1311 }
1312 }
1313
1314 if (new_conf->cram_hmac_alg[0] != 0) {
1315 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
1316 new_conf->cram_hmac_alg);
1317 tfm = crypto_alloc_hash(hmac_name, 0, CRYPTO_ALG_ASYNC);
1318 if (IS_ERR(tfm)) {
1319 tfm = NULL;
1320 retcode = ERR_AUTH_ALG;
1321 goto fail;
1322 }
1323
1324 if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) {
1325 retcode = ERR_AUTH_ALG_ND;
1326 goto fail;
1327 }
1328 }
1329
1330 if (new_conf->integrity_alg[0]) {
1331 integrity_w_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1332 if (IS_ERR(integrity_w_tfm)) {
1333 integrity_w_tfm = NULL;
1334 retcode=ERR_INTEGRITY_ALG;
1335 goto fail;
1336 }
1337
1338 if (!drbd_crypto_is_hash(crypto_hash_tfm(integrity_w_tfm))) {
1339 retcode=ERR_INTEGRITY_ALG_ND;
1340 goto fail;
1341 }
1342
1343 integrity_r_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1344 if (IS_ERR(integrity_r_tfm)) {
1345 integrity_r_tfm = NULL;
1346 retcode=ERR_INTEGRITY_ALG;
1347 goto fail;
1348 }
1349 }
1350
1351 ns = new_conf->max_epoch_size/8;
1352 if (mdev->tl_hash_s != ns) {
1353 new_tl_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
1354 if (!new_tl_hash) {
1355 retcode = ERR_NOMEM;
1356 goto fail;
1357 }
1358 }
1359
1360 ns = new_conf->max_buffers/8;
1361 if (new_conf->two_primaries && (mdev->ee_hash_s != ns)) {
1362 new_ee_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
1363 if (!new_ee_hash) {
1364 retcode = ERR_NOMEM;
1365 goto fail;
1366 }
1367 }
1368
1369 ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
1370
1371 if (integrity_w_tfm) {
1372 i = crypto_hash_digestsize(integrity_w_tfm);
1373 int_dig_out = kmalloc(i, GFP_KERNEL);
1374 if (!int_dig_out) {
1375 retcode = ERR_NOMEM;
1376 goto fail;
1377 }
1378 int_dig_in = kmalloc(i, GFP_KERNEL);
1379 if (!int_dig_in) {
1380 retcode = ERR_NOMEM;
1381 goto fail;
1382 }
1383 int_dig_vv = kmalloc(i, GFP_KERNEL);
1384 if (!int_dig_vv) {
1385 retcode = ERR_NOMEM;
1386 goto fail;
1387 }
1388 }
1389
1390 if (!mdev->bitmap) {
1391 if(drbd_bm_init(mdev)) {
1392 retcode = ERR_NOMEM;
1393 goto fail;
1394 }
1395 }
1396
1397 spin_lock_irq(&mdev->req_lock);
1398 if (mdev->net_conf != NULL) {
1399 retcode = ERR_NET_CONFIGURED;
1400 spin_unlock_irq(&mdev->req_lock);
1401 goto fail;
1402 }
1403 mdev->net_conf = new_conf;
1404
1405 mdev->send_cnt = 0;
1406 mdev->recv_cnt = 0;
1407
1408 if (new_tl_hash) {
1409 kfree(mdev->tl_hash);
1410 mdev->tl_hash_s = mdev->net_conf->max_epoch_size/8;
1411 mdev->tl_hash = new_tl_hash;
1412 }
1413
1414 if (new_ee_hash) {
1415 kfree(mdev->ee_hash);
1416 mdev->ee_hash_s = mdev->net_conf->max_buffers/8;
1417 mdev->ee_hash = new_ee_hash;
1418 }
1419
1420 crypto_free_hash(mdev->cram_hmac_tfm);
1421 mdev->cram_hmac_tfm = tfm;
1422
1423 crypto_free_hash(mdev->integrity_w_tfm);
1424 mdev->integrity_w_tfm = integrity_w_tfm;
1425
1426 crypto_free_hash(mdev->integrity_r_tfm);
1427 mdev->integrity_r_tfm = integrity_r_tfm;
1428
1429 kfree(mdev->int_dig_out);
1430 kfree(mdev->int_dig_in);
1431 kfree(mdev->int_dig_vv);
1432 mdev->int_dig_out=int_dig_out;
1433 mdev->int_dig_in=int_dig_in;
1434 mdev->int_dig_vv=int_dig_vv;
1435 spin_unlock_irq(&mdev->req_lock);
1436
1437 retcode = _drbd_request_state(mdev, NS(conn, C_UNCONNECTED), CS_VERBOSE);
1438
1439 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1440 reply->ret_code = retcode;
1441 drbd_reconfig_done(mdev);
1442 return 0;
1443
1444 fail:
1445 kfree(int_dig_out);
1446 kfree(int_dig_in);
1447 kfree(int_dig_vv);
1448 crypto_free_hash(tfm);
1449 crypto_free_hash(integrity_w_tfm);
1450 crypto_free_hash(integrity_r_tfm);
1451 kfree(new_tl_hash);
1452 kfree(new_ee_hash);
1453 kfree(new_conf);
1454
1455 reply->ret_code = retcode;
1456 drbd_reconfig_done(mdev);
1457 return 0;
1458 }
1459
1460 static int drbd_nl_disconnect(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1461 struct drbd_nl_cfg_reply *reply)
1462 {
1463 int retcode;
1464
1465 retcode = _drbd_request_state(mdev, NS(conn, C_DISCONNECTING), CS_ORDERED);
1466
1467 if (retcode == SS_NOTHING_TO_DO)
1468 goto done;
1469 else if (retcode == SS_ALREADY_STANDALONE)
1470 goto done;
1471 else if (retcode == SS_PRIMARY_NOP) {
1472 /* Our statche checking code wants to see the peer outdated. */
1473 retcode = drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
1474 pdsk, D_OUTDATED));
1475 } else if (retcode == SS_CW_FAILED_BY_PEER) {
1476 /* The peer probably wants to see us outdated. */
1477 retcode = _drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
1478 disk, D_OUTDATED),
1479 CS_ORDERED);
1480 if (retcode == SS_IS_DISKLESS || retcode == SS_LOWER_THAN_OUTDATED) {
1481 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
1482 retcode = SS_SUCCESS;
1483 }
1484 }
1485
1486 if (retcode < SS_SUCCESS)
1487 goto fail;
1488
1489 if (wait_event_interruptible(mdev->state_wait,
1490 mdev->state.conn != C_DISCONNECTING)) {
1491 /* Do not test for mdev->state.conn == C_STANDALONE, since
1492 someone else might connect us in the mean time! */
1493 retcode = ERR_INTR;
1494 goto fail;
1495 }
1496
1497 done:
1498 retcode = NO_ERROR;
1499 fail:
1500 drbd_md_sync(mdev);
1501 reply->ret_code = retcode;
1502 return 0;
1503 }
1504
1505 void resync_after_online_grow(struct drbd_conf *mdev)
1506 {
1507 int iass; /* I am sync source */
1508
1509 dev_info(DEV, "Resync of new storage after online grow\n");
1510 if (mdev->state.role != mdev->state.peer)
1511 iass = (mdev->state.role == R_PRIMARY);
1512 else
1513 iass = test_bit(DISCARD_CONCURRENT, &mdev->flags);
1514
1515 if (iass)
1516 drbd_start_resync(mdev, C_SYNC_SOURCE);
1517 else
1518 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
1519 }
1520
1521 static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1522 struct drbd_nl_cfg_reply *reply)
1523 {
1524 struct resize rs;
1525 int retcode = NO_ERROR;
1526 enum determine_dev_size dd;
1527 enum dds_flags ddsf;
1528
1529 memset(&rs, 0, sizeof(struct resize));
1530 if (!resize_from_tags(mdev, nlp->tag_list, &rs)) {
1531 retcode = ERR_MANDATORY_TAG;
1532 goto fail;
1533 }
1534
1535 if (mdev->state.conn > C_CONNECTED) {
1536 retcode = ERR_RESIZE_RESYNC;
1537 goto fail;
1538 }
1539
1540 if (mdev->state.role == R_SECONDARY &&
1541 mdev->state.peer == R_SECONDARY) {
1542 retcode = ERR_NO_PRIMARY;
1543 goto fail;
1544 }
1545
1546 if (!get_ldev(mdev)) {
1547 retcode = ERR_NO_DISK;
1548 goto fail;
1549 }
1550
1551 if (rs.no_resync && mdev->agreed_pro_version < 93) {
1552 retcode = ERR_NEED_APV_93;
1553 goto fail;
1554 }
1555
1556 if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev))
1557 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
1558
1559 mdev->ldev->dc.disk_size = (sector_t)rs.resize_size;
1560 ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
1561 dd = drbd_determin_dev_size(mdev, ddsf);
1562 drbd_md_sync(mdev);
1563 put_ldev(mdev);
1564 if (dd == dev_size_error) {
1565 retcode = ERR_NOMEM_BITMAP;
1566 goto fail;
1567 }
1568
1569 if (mdev->state.conn == C_CONNECTED) {
1570 if (dd == grew)
1571 set_bit(RESIZE_PENDING, &mdev->flags);
1572
1573 drbd_send_uuids(mdev);
1574 drbd_send_sizes(mdev, 1, ddsf);
1575 }
1576
1577 fail:
1578 reply->ret_code = retcode;
1579 return 0;
1580 }
1581
1582 static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1583 struct drbd_nl_cfg_reply *reply)
1584 {
1585 int retcode = NO_ERROR;
1586 int err;
1587 int ovr; /* online verify running */
1588 int rsr; /* re-sync running */
1589 struct crypto_hash *verify_tfm = NULL;
1590 struct crypto_hash *csums_tfm = NULL;
1591 struct syncer_conf sc;
1592 cpumask_var_t new_cpu_mask;
1593
1594 if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) {
1595 retcode = ERR_NOMEM;
1596 goto fail;
1597 }
1598
1599 if (nlp->flags & DRBD_NL_SET_DEFAULTS) {
1600 memset(&sc, 0, sizeof(struct syncer_conf));
1601 sc.rate = DRBD_RATE_DEF;
1602 sc.after = DRBD_AFTER_DEF;
1603 sc.al_extents = DRBD_AL_EXTENTS_DEF;
1604 sc.on_no_data = DRBD_ON_NO_DATA_DEF;
1605 } else
1606 memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf));
1607
1608 if (!syncer_conf_from_tags(mdev, nlp->tag_list, &sc)) {
1609 retcode = ERR_MANDATORY_TAG;
1610 goto fail;
1611 }
1612
1613 /* re-sync running */
1614 rsr = ( mdev->state.conn == C_SYNC_SOURCE ||
1615 mdev->state.conn == C_SYNC_TARGET ||
1616 mdev->state.conn == C_PAUSED_SYNC_S ||
1617 mdev->state.conn == C_PAUSED_SYNC_T );
1618
1619 if (rsr && strcmp(sc.csums_alg, mdev->sync_conf.csums_alg)) {
1620 retcode = ERR_CSUMS_RESYNC_RUNNING;
1621 goto fail;
1622 }
1623
1624 if (!rsr && sc.csums_alg[0]) {
1625 csums_tfm = crypto_alloc_hash(sc.csums_alg, 0, CRYPTO_ALG_ASYNC);
1626 if (IS_ERR(csums_tfm)) {
1627 csums_tfm = NULL;
1628 retcode = ERR_CSUMS_ALG;
1629 goto fail;
1630 }
1631
1632 if (!drbd_crypto_is_hash(crypto_hash_tfm(csums_tfm))) {
1633 retcode = ERR_CSUMS_ALG_ND;
1634 goto fail;
1635 }
1636 }
1637
1638 /* online verify running */
1639 ovr = (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T);
1640
1641 if (ovr) {
1642 if (strcmp(sc.verify_alg, mdev->sync_conf.verify_alg)) {
1643 retcode = ERR_VERIFY_RUNNING;
1644 goto fail;
1645 }
1646 }
1647
1648 if (!ovr && sc.verify_alg[0]) {
1649 verify_tfm = crypto_alloc_hash(sc.verify_alg, 0, CRYPTO_ALG_ASYNC);
1650 if (IS_ERR(verify_tfm)) {
1651 verify_tfm = NULL;
1652 retcode = ERR_VERIFY_ALG;
1653 goto fail;
1654 }
1655
1656 if (!drbd_crypto_is_hash(crypto_hash_tfm(verify_tfm))) {
1657 retcode = ERR_VERIFY_ALG_ND;
1658 goto fail;
1659 }
1660 }
1661
1662 /* silently ignore cpu mask on UP kernel */
1663 if (nr_cpu_ids > 1 && sc.cpu_mask[0] != 0) {
1664 err = __bitmap_parse(sc.cpu_mask, 32, 0,
1665 cpumask_bits(new_cpu_mask), nr_cpu_ids);
1666 if (err) {
1667 dev_warn(DEV, "__bitmap_parse() failed with %d\n", err);
1668 retcode = ERR_CPU_MASK_PARSE;
1669 goto fail;
1670 }
1671 }
1672
1673 ERR_IF (sc.rate < 1) sc.rate = 1;
1674 ERR_IF (sc.al_extents < 7) sc.al_extents = 127; /* arbitrary minimum */
1675 #define AL_MAX ((MD_AL_MAX_SIZE-1) * AL_EXTENTS_PT)
1676 if (sc.al_extents > AL_MAX) {
1677 dev_err(DEV, "sc.al_extents > %d\n", AL_MAX);
1678 sc.al_extents = AL_MAX;
1679 }
1680 #undef AL_MAX
1681
1682 /* most sanity checks done, try to assign the new sync-after
1683 * dependency. need to hold the global lock in there,
1684 * to avoid a race in the dependency loop check. */
1685 retcode = drbd_alter_sa(mdev, sc.after);
1686 if (retcode != NO_ERROR)
1687 goto fail;
1688
1689 /* ok, assign the rest of it as well.
1690 * lock against receive_SyncParam() */
1691 spin_lock(&mdev->peer_seq_lock);
1692 mdev->sync_conf = sc;
1693
1694 if (!rsr) {
1695 crypto_free_hash(mdev->csums_tfm);
1696 mdev->csums_tfm = csums_tfm;
1697 csums_tfm = NULL;
1698 }
1699
1700 if (!ovr) {
1701 crypto_free_hash(mdev->verify_tfm);
1702 mdev->verify_tfm = verify_tfm;
1703 verify_tfm = NULL;
1704 }
1705 spin_unlock(&mdev->peer_seq_lock);
1706
1707 if (get_ldev(mdev)) {
1708 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
1709 drbd_al_shrink(mdev);
1710 err = drbd_check_al_size(mdev);
1711 lc_unlock(mdev->act_log);
1712 wake_up(&mdev->al_wait);
1713
1714 put_ldev(mdev);
1715 drbd_md_sync(mdev);
1716
1717 if (err) {
1718 retcode = ERR_NOMEM;
1719 goto fail;
1720 }
1721 }
1722
1723 if (mdev->state.conn >= C_CONNECTED)
1724 drbd_send_sync_param(mdev, &sc);
1725
1726 if (!cpumask_equal(mdev->cpu_mask, new_cpu_mask)) {
1727 cpumask_copy(mdev->cpu_mask, new_cpu_mask);
1728 drbd_calc_cpu_mask(mdev);
1729 mdev->receiver.reset_cpu_mask = 1;
1730 mdev->asender.reset_cpu_mask = 1;
1731 mdev->worker.reset_cpu_mask = 1;
1732 }
1733
1734 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1735 fail:
1736 free_cpumask_var(new_cpu_mask);
1737 crypto_free_hash(csums_tfm);
1738 crypto_free_hash(verify_tfm);
1739 reply->ret_code = retcode;
1740 return 0;
1741 }
1742
1743 static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1744 struct drbd_nl_cfg_reply *reply)
1745 {
1746 int retcode;
1747
1748 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
1749
1750 if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
1751 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1752
1753 while (retcode == SS_NEED_CONNECTION) {
1754 spin_lock_irq(&mdev->req_lock);
1755 if (mdev->state.conn < C_CONNECTED)
1756 retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL);
1757 spin_unlock_irq(&mdev->req_lock);
1758
1759 if (retcode != SS_NEED_CONNECTION)
1760 break;
1761
1762 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1763 }
1764
1765 reply->ret_code = retcode;
1766 return 0;
1767 }
1768
1769 static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1770 struct drbd_nl_cfg_reply *reply)
1771 {
1772
1773 reply->ret_code = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
1774
1775 return 0;
1776 }
1777
1778 static int drbd_nl_pause_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1779 struct drbd_nl_cfg_reply *reply)
1780 {
1781 int retcode = NO_ERROR;
1782
1783 if (drbd_request_state(mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
1784 retcode = ERR_PAUSE_IS_SET;
1785
1786 reply->ret_code = retcode;
1787 return 0;
1788 }
1789
1790 static int drbd_nl_resume_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1791 struct drbd_nl_cfg_reply *reply)
1792 {
1793 int retcode = NO_ERROR;
1794
1795 if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO)
1796 retcode = ERR_PAUSE_IS_CLEAR;
1797
1798 reply->ret_code = retcode;
1799 return 0;
1800 }
1801
1802 static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1803 struct drbd_nl_cfg_reply *reply)
1804 {
1805 reply->ret_code = drbd_request_state(mdev, NS(susp, 1));
1806
1807 return 0;
1808 }
1809
1810 static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1811 struct drbd_nl_cfg_reply *reply)
1812 {
1813 drbd_suspend_io(mdev);
1814 reply->ret_code = drbd_request_state(mdev, NS(susp, 0));
1815 if (reply->ret_code == SS_SUCCESS) {
1816 if (mdev->state.conn < C_CONNECTED)
1817 tl_clear(mdev);
1818 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED)
1819 tl_restart(mdev, fail_frozen_disk_io);
1820 }
1821 drbd_resume_io(mdev);
1822
1823 return 0;
1824 }
1825
1826 static int drbd_nl_outdate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1827 struct drbd_nl_cfg_reply *reply)
1828 {
1829 reply->ret_code = drbd_request_state(mdev, NS(disk, D_OUTDATED));
1830 return 0;
1831 }
1832
1833 static int drbd_nl_get_config(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1834 struct drbd_nl_cfg_reply *reply)
1835 {
1836 unsigned short *tl;
1837
1838 tl = reply->tag_list;
1839
1840 if (get_ldev(mdev)) {
1841 tl = disk_conf_to_tags(mdev, &mdev->ldev->dc, tl);
1842 put_ldev(mdev);
1843 }
1844
1845 if (get_net_conf(mdev)) {
1846 tl = net_conf_to_tags(mdev, mdev->net_conf, tl);
1847 put_net_conf(mdev);
1848 }
1849 tl = syncer_conf_to_tags(mdev, &mdev->sync_conf, tl);
1850
1851 put_unaligned(TT_END, tl++); /* Close the tag list */
1852
1853 return (int)((char *)tl - (char *)reply->tag_list);
1854 }
1855
1856 static int drbd_nl_get_state(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1857 struct drbd_nl_cfg_reply *reply)
1858 {
1859 unsigned short *tl = reply->tag_list;
1860 union drbd_state s = mdev->state;
1861 unsigned long rs_left;
1862 unsigned int res;
1863
1864 tl = get_state_to_tags(mdev, (struct get_state *)&s, tl);
1865
1866 /* no local ref, no bitmap, no syncer progress. */
1867 if (s.conn >= C_SYNC_SOURCE && s.conn <= C_PAUSED_SYNC_T) {
1868 if (get_ldev(mdev)) {
1869 drbd_get_syncer_progress(mdev, &rs_left, &res);
1870 tl = tl_add_int(tl, T_sync_progress, &res);
1871 put_ldev(mdev);
1872 }
1873 }
1874 put_unaligned(TT_END, tl++); /* Close the tag list */
1875
1876 return (int)((char *)tl - (char *)reply->tag_list);
1877 }
1878
1879 static int drbd_nl_get_uuids(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1880 struct drbd_nl_cfg_reply *reply)
1881 {
1882 unsigned short *tl;
1883
1884 tl = reply->tag_list;
1885
1886 if (get_ldev(mdev)) {
1887 tl = tl_add_blob(tl, T_uuids, mdev->ldev->md.uuid, UI_SIZE*sizeof(u64));
1888 tl = tl_add_int(tl, T_uuids_flags, &mdev->ldev->md.flags);
1889 put_ldev(mdev);
1890 }
1891 put_unaligned(TT_END, tl++); /* Close the tag list */
1892
1893 return (int)((char *)tl - (char *)reply->tag_list);
1894 }
1895
1896 /**
1897 * drbd_nl_get_timeout_flag() - Used by drbdsetup to find out which timeout value to use
1898 * @mdev: DRBD device.
1899 * @nlp: Netlink/connector packet from drbdsetup
1900 * @reply: Reply packet for drbdsetup
1901 */
1902 static int drbd_nl_get_timeout_flag(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1903 struct drbd_nl_cfg_reply *reply)
1904 {
1905 unsigned short *tl;
1906 char rv;
1907
1908 tl = reply->tag_list;
1909
1910 rv = mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
1911 test_bit(USE_DEGR_WFC_T, &mdev->flags) ? UT_DEGRADED : UT_DEFAULT;
1912
1913 tl = tl_add_blob(tl, T_use_degraded, &rv, sizeof(rv));
1914 put_unaligned(TT_END, tl++); /* Close the tag list */
1915
1916 return (int)((char *)tl - (char *)reply->tag_list);
1917 }
1918
1919 static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1920 struct drbd_nl_cfg_reply *reply)
1921 {
1922 /* default to resume from last known position, if possible */
1923 struct start_ov args =
1924 { .start_sector = mdev->ov_start_sector };
1925
1926 if (!start_ov_from_tags(mdev, nlp->tag_list, &args)) {
1927 reply->ret_code = ERR_MANDATORY_TAG;
1928 return 0;
1929 }
1930 /* w_make_ov_request expects position to be aligned */
1931 mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT;
1932 reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
1933 return 0;
1934 }
1935
1936
1937 static int drbd_nl_new_c_uuid(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1938 struct drbd_nl_cfg_reply *reply)
1939 {
1940 int retcode = NO_ERROR;
1941 int skip_initial_sync = 0;
1942 int err;
1943
1944 struct new_c_uuid args;
1945
1946 memset(&args, 0, sizeof(struct new_c_uuid));
1947 if (!new_c_uuid_from_tags(mdev, nlp->tag_list, &args)) {
1948 reply->ret_code = ERR_MANDATORY_TAG;
1949 return 0;
1950 }
1951
1952 mutex_lock(&mdev->state_mutex); /* Protects us against serialized state changes. */
1953
1954 if (!get_ldev(mdev)) {
1955 retcode = ERR_NO_DISK;
1956 goto out;
1957 }
1958
1959 /* this is "skip initial sync", assume to be clean */
1960 if (mdev->state.conn == C_CONNECTED && mdev->agreed_pro_version >= 90 &&
1961 mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
1962 dev_info(DEV, "Preparing to skip initial sync\n");
1963 skip_initial_sync = 1;
1964 } else if (mdev->state.conn != C_STANDALONE) {
1965 retcode = ERR_CONNECTED;
1966 goto out_dec;
1967 }
1968
1969 drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
1970 drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
1971
1972 if (args.clear_bm) {
1973 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, "clear_n_write from new_c_uuid");
1974 if (err) {
1975 dev_err(DEV, "Writing bitmap failed with %d\n",err);
1976 retcode = ERR_IO_MD_DISK;
1977 }
1978 if (skip_initial_sync) {
1979 drbd_send_uuids_skip_initial_sync(mdev);
1980 _drbd_uuid_set(mdev, UI_BITMAP, 0);
1981 spin_lock_irq(&mdev->req_lock);
1982 _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
1983 CS_VERBOSE, NULL);
1984 spin_unlock_irq(&mdev->req_lock);
1985 }
1986 }
1987
1988 drbd_md_sync(mdev);
1989 out_dec:
1990 put_ldev(mdev);
1991 out:
1992 mutex_unlock(&mdev->state_mutex);
1993
1994 reply->ret_code = retcode;
1995 return 0;
1996 }
1997
1998 static struct drbd_conf *ensure_mdev(struct drbd_nl_cfg_req *nlp)
1999 {
2000 struct drbd_conf *mdev;
2001
2002 if (nlp->drbd_minor >= minor_count)
2003 return NULL;
2004
2005 mdev = minor_to_mdev(nlp->drbd_minor);
2006
2007 if (!mdev && (nlp->flags & DRBD_NL_CREATE_DEVICE)) {
2008 struct gendisk *disk = NULL;
2009 mdev = drbd_new_device(nlp->drbd_minor);
2010
2011 spin_lock_irq(&drbd_pp_lock);
2012 if (minor_table[nlp->drbd_minor] == NULL) {
2013 minor_table[nlp->drbd_minor] = mdev;
2014 disk = mdev->vdisk;
2015 mdev = NULL;
2016 } /* else: we lost the race */
2017 spin_unlock_irq(&drbd_pp_lock);
2018
2019 if (disk) /* we won the race above */
2020 /* in case we ever add a drbd_delete_device(),
2021 * don't forget the del_gendisk! */
2022 add_disk(disk);
2023 else /* we lost the race above */
2024 drbd_free_mdev(mdev);
2025
2026 mdev = minor_to_mdev(nlp->drbd_minor);
2027 }
2028
2029 return mdev;
2030 }
2031
2032 struct cn_handler_struct {
2033 int (*function)(struct drbd_conf *,
2034 struct drbd_nl_cfg_req *,
2035 struct drbd_nl_cfg_reply *);
2036 int reply_body_size;
2037 };
2038
2039 static struct cn_handler_struct cnd_table[] = {
2040 [ P_primary ] = { &drbd_nl_primary, 0 },
2041 [ P_secondary ] = { &drbd_nl_secondary, 0 },
2042 [ P_disk_conf ] = { &drbd_nl_disk_conf, 0 },
2043 [ P_detach ] = { &drbd_nl_detach, 0 },
2044 [ P_net_conf ] = { &drbd_nl_net_conf, 0 },
2045 [ P_disconnect ] = { &drbd_nl_disconnect, 0 },
2046 [ P_resize ] = { &drbd_nl_resize, 0 },
2047 [ P_syncer_conf ] = { &drbd_nl_syncer_conf, 0 },
2048 [ P_invalidate ] = { &drbd_nl_invalidate, 0 },
2049 [ P_invalidate_peer ] = { &drbd_nl_invalidate_peer, 0 },
2050 [ P_pause_sync ] = { &drbd_nl_pause_sync, 0 },
2051 [ P_resume_sync ] = { &drbd_nl_resume_sync, 0 },
2052 [ P_suspend_io ] = { &drbd_nl_suspend_io, 0 },
2053 [ P_resume_io ] = { &drbd_nl_resume_io, 0 },
2054 [ P_outdate ] = { &drbd_nl_outdate, 0 },
2055 [ P_get_config ] = { &drbd_nl_get_config,
2056 sizeof(struct syncer_conf_tag_len_struct) +
2057 sizeof(struct disk_conf_tag_len_struct) +
2058 sizeof(struct net_conf_tag_len_struct) },
2059 [ P_get_state ] = { &drbd_nl_get_state,
2060 sizeof(struct get_state_tag_len_struct) +
2061 sizeof(struct sync_progress_tag_len_struct) },
2062 [ P_get_uuids ] = { &drbd_nl_get_uuids,
2063 sizeof(struct get_uuids_tag_len_struct) },
2064 [ P_get_timeout_flag ] = { &drbd_nl_get_timeout_flag,
2065 sizeof(struct get_timeout_flag_tag_len_struct)},
2066 [ P_start_ov ] = { &drbd_nl_start_ov, 0 },
2067 [ P_new_c_uuid ] = { &drbd_nl_new_c_uuid, 0 },
2068 };
2069
2070 static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp)
2071 {
2072 struct drbd_nl_cfg_req *nlp = (struct drbd_nl_cfg_req *)req->data;
2073 struct cn_handler_struct *cm;
2074 struct cn_msg *cn_reply;
2075 struct drbd_nl_cfg_reply *reply;
2076 struct drbd_conf *mdev;
2077 int retcode, rr;
2078 int reply_size = sizeof(struct cn_msg)
2079 + sizeof(struct drbd_nl_cfg_reply)
2080 + sizeof(short int);
2081
2082 if (!try_module_get(THIS_MODULE)) {
2083 printk(KERN_ERR "drbd: try_module_get() failed!\n");
2084 return;
2085 }
2086
2087 if (!cap_raised(nsp->eff_cap, CAP_SYS_ADMIN)) {
2088 retcode = ERR_PERM;
2089 goto fail;
2090 }
2091
2092 mdev = ensure_mdev(nlp);
2093 if (!mdev) {
2094 retcode = ERR_MINOR_INVALID;
2095 goto fail;
2096 }
2097
2098 if (nlp->packet_type >= P_nl_after_last_packet) {
2099 retcode = ERR_PACKET_NR;
2100 goto fail;
2101 }
2102
2103 cm = cnd_table + nlp->packet_type;
2104
2105 /* This may happen if packet number is 0: */
2106 if (cm->function == NULL) {
2107 retcode = ERR_PACKET_NR;
2108 goto fail;
2109 }
2110
2111 reply_size += cm->reply_body_size;
2112
2113 /* allocation not in the IO path, cqueue thread context */
2114 cn_reply = kmalloc(reply_size, GFP_KERNEL);
2115 if (!cn_reply) {
2116 retcode = ERR_NOMEM;
2117 goto fail;
2118 }
2119 reply = (struct drbd_nl_cfg_reply *) cn_reply->data;
2120
2121 reply->packet_type =
2122 cm->reply_body_size ? nlp->packet_type : P_nl_after_last_packet;
2123 reply->minor = nlp->drbd_minor;
2124 reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */
2125 /* reply->tag_list; might be modified by cm->function. */
2126
2127 rr = cm->function(mdev, nlp, reply);
2128
2129 cn_reply->id = req->id;
2130 cn_reply->seq = req->seq;
2131 cn_reply->ack = req->ack + 1;
2132 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + rr;
2133 cn_reply->flags = 0;
2134
2135 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL);
2136 if (rr && rr != -ESRCH)
2137 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2138
2139 kfree(cn_reply);
2140 module_put(THIS_MODULE);
2141 return;
2142 fail:
2143 drbd_nl_send_reply(req, retcode);
2144 module_put(THIS_MODULE);
2145 }
2146
2147 static atomic_t drbd_nl_seq = ATOMIC_INIT(2); /* two. */
2148
2149 static unsigned short *
2150 __tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data,
2151 unsigned short len, int nul_terminated)
2152 {
2153 unsigned short l = tag_descriptions[tag_number(tag)].max_len;
2154 len = (len < l) ? len : l;
2155 put_unaligned(tag, tl++);
2156 put_unaligned(len, tl++);
2157 memcpy(tl, data, len);
2158 tl = (unsigned short*)((char*)tl + len);
2159 if (nul_terminated)
2160 *((char*)tl - 1) = 0;
2161 return tl;
2162 }
2163
2164 static unsigned short *
2165 tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, int len)
2166 {
2167 return __tl_add_blob(tl, tag, data, len, 0);
2168 }
2169
2170 static unsigned short *
2171 tl_add_str(unsigned short *tl, enum drbd_tags tag, const char *str)
2172 {
2173 return __tl_add_blob(tl, tag, str, strlen(str)+1, 0);
2174 }
2175
2176 static unsigned short *
2177 tl_add_int(unsigned short *tl, enum drbd_tags tag, const void *val)
2178 {
2179 put_unaligned(tag, tl++);
2180 switch(tag_type(tag)) {
2181 case TT_INTEGER:
2182 put_unaligned(sizeof(int), tl++);
2183 put_unaligned(*(int *)val, (int *)tl);
2184 tl = (unsigned short*)((char*)tl+sizeof(int));
2185 break;
2186 case TT_INT64:
2187 put_unaligned(sizeof(u64), tl++);
2188 put_unaligned(*(u64 *)val, (u64 *)tl);
2189 tl = (unsigned short*)((char*)tl+sizeof(u64));
2190 break;
2191 default:
2192 /* someone did something stupid. */
2193 ;
2194 }
2195 return tl;
2196 }
2197
2198 void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state state)
2199 {
2200 char buffer[sizeof(struct cn_msg)+
2201 sizeof(struct drbd_nl_cfg_reply)+
2202 sizeof(struct get_state_tag_len_struct)+
2203 sizeof(short int)];
2204 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2205 struct drbd_nl_cfg_reply *reply =
2206 (struct drbd_nl_cfg_reply *)cn_reply->data;
2207 unsigned short *tl = reply->tag_list;
2208
2209 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2210
2211 tl = get_state_to_tags(mdev, (struct get_state *)&state, tl);
2212
2213 put_unaligned(TT_END, tl++); /* Close the tag list */
2214
2215 cn_reply->id.idx = CN_IDX_DRBD;
2216 cn_reply->id.val = CN_VAL_DRBD;
2217
2218 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2219 cn_reply->ack = 0; /* not used here. */
2220 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2221 (int)((char *)tl - (char *)reply->tag_list);
2222 cn_reply->flags = 0;
2223
2224 reply->packet_type = P_get_state;
2225 reply->minor = mdev_to_minor(mdev);
2226 reply->ret_code = NO_ERROR;
2227
2228 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2229 }
2230
2231 void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name)
2232 {
2233 char buffer[sizeof(struct cn_msg)+
2234 sizeof(struct drbd_nl_cfg_reply)+
2235 sizeof(struct call_helper_tag_len_struct)+
2236 sizeof(short int)];
2237 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2238 struct drbd_nl_cfg_reply *reply =
2239 (struct drbd_nl_cfg_reply *)cn_reply->data;
2240 unsigned short *tl = reply->tag_list;
2241
2242 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2243
2244 tl = tl_add_str(tl, T_helper, helper_name);
2245 put_unaligned(TT_END, tl++); /* Close the tag list */
2246
2247 cn_reply->id.idx = CN_IDX_DRBD;
2248 cn_reply->id.val = CN_VAL_DRBD;
2249
2250 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2251 cn_reply->ack = 0; /* not used here. */
2252 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2253 (int)((char *)tl - (char *)reply->tag_list);
2254 cn_reply->flags = 0;
2255
2256 reply->packet_type = P_call_helper;
2257 reply->minor = mdev_to_minor(mdev);
2258 reply->ret_code = NO_ERROR;
2259
2260 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2261 }
2262
2263 void drbd_bcast_ee(struct drbd_conf *mdev,
2264 const char *reason, const int dgs,
2265 const char* seen_hash, const char* calc_hash,
2266 const struct drbd_epoch_entry* e)
2267 {
2268 struct cn_msg *cn_reply;
2269 struct drbd_nl_cfg_reply *reply;
2270 unsigned short *tl;
2271 struct page *page;
2272 unsigned len;
2273
2274 if (!e)
2275 return;
2276 if (!reason || !reason[0])
2277 return;
2278
2279 /* apparently we have to memcpy twice, first to prepare the data for the
2280 * struct cn_msg, then within cn_netlink_send from the cn_msg to the
2281 * netlink skb. */
2282 /* receiver thread context, which is not in the writeout path (of this node),
2283 * but may be in the writeout path of the _other_ node.
2284 * GFP_NOIO to avoid potential "distributed deadlock". */
2285 cn_reply = kmalloc(
2286 sizeof(struct cn_msg)+
2287 sizeof(struct drbd_nl_cfg_reply)+
2288 sizeof(struct dump_ee_tag_len_struct)+
2289 sizeof(short int),
2290 GFP_NOIO);
2291
2292 if (!cn_reply) {
2293 dev_err(DEV, "could not kmalloc buffer for drbd_bcast_ee, sector %llu, size %u\n",
2294 (unsigned long long)e->sector, e->size);
2295 return;
2296 }
2297
2298 reply = (struct drbd_nl_cfg_reply*)cn_reply->data;
2299 tl = reply->tag_list;
2300
2301 tl = tl_add_str(tl, T_dump_ee_reason, reason);
2302 tl = tl_add_blob(tl, T_seen_digest, seen_hash, dgs);
2303 tl = tl_add_blob(tl, T_calc_digest, calc_hash, dgs);
2304 tl = tl_add_int(tl, T_ee_sector, &e->sector);
2305 tl = tl_add_int(tl, T_ee_block_id, &e->block_id);
2306
2307 put_unaligned(T_ee_data, tl++);
2308 put_unaligned(e->size, tl++);
2309
2310 len = e->size;
2311 page = e->pages;
2312 page_chain_for_each(page) {
2313 void *d = kmap_atomic(page, KM_USER0);
2314 unsigned l = min_t(unsigned, len, PAGE_SIZE);
2315 memcpy(tl, d, l);
2316 kunmap_atomic(d, KM_USER0);
2317 tl = (unsigned short*)((char*)tl + l);
2318 len -= l;
2319 }
2320 put_unaligned(TT_END, tl++); /* Close the tag list */
2321
2322 cn_reply->id.idx = CN_IDX_DRBD;
2323 cn_reply->id.val = CN_VAL_DRBD;
2324
2325 cn_reply->seq = atomic_add_return(1,&drbd_nl_seq);
2326 cn_reply->ack = 0; // not used here.
2327 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2328 (int)((char*)tl - (char*)reply->tag_list);
2329 cn_reply->flags = 0;
2330
2331 reply->packet_type = P_dump_ee;
2332 reply->minor = mdev_to_minor(mdev);
2333 reply->ret_code = NO_ERROR;
2334
2335 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2336 kfree(cn_reply);
2337 }
2338
2339 void drbd_bcast_sync_progress(struct drbd_conf *mdev)
2340 {
2341 char buffer[sizeof(struct cn_msg)+
2342 sizeof(struct drbd_nl_cfg_reply)+
2343 sizeof(struct sync_progress_tag_len_struct)+
2344 sizeof(short int)];
2345 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2346 struct drbd_nl_cfg_reply *reply =
2347 (struct drbd_nl_cfg_reply *)cn_reply->data;
2348 unsigned short *tl = reply->tag_list;
2349 unsigned long rs_left;
2350 unsigned int res;
2351
2352 /* no local ref, no bitmap, no syncer progress, no broadcast. */
2353 if (!get_ldev(mdev))
2354 return;
2355 drbd_get_syncer_progress(mdev, &rs_left, &res);
2356 put_ldev(mdev);
2357
2358 tl = tl_add_int(tl, T_sync_progress, &res);
2359 put_unaligned(TT_END, tl++); /* Close the tag list */
2360
2361 cn_reply->id.idx = CN_IDX_DRBD;
2362 cn_reply->id.val = CN_VAL_DRBD;
2363
2364 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2365 cn_reply->ack = 0; /* not used here. */
2366 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2367 (int)((char *)tl - (char *)reply->tag_list);
2368 cn_reply->flags = 0;
2369
2370 reply->packet_type = P_sync_progress;
2371 reply->minor = mdev_to_minor(mdev);
2372 reply->ret_code = NO_ERROR;
2373
2374 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2375 }
2376
2377 int __init drbd_nl_init(void)
2378 {
2379 static struct cb_id cn_id_drbd;
2380 int err, try=10;
2381
2382 cn_id_drbd.val = CN_VAL_DRBD;
2383 do {
2384 cn_id_drbd.idx = cn_idx;
2385 err = cn_add_callback(&cn_id_drbd, "cn_drbd", &drbd_connector_callback);
2386 if (!err)
2387 break;
2388 cn_idx = (cn_idx + CN_IDX_STEP);
2389 } while (try--);
2390
2391 if (err) {
2392 printk(KERN_ERR "drbd: cn_drbd failed to register\n");
2393 return err;
2394 }
2395
2396 return 0;
2397 }
2398
2399 void drbd_nl_cleanup(void)
2400 {
2401 static struct cb_id cn_id_drbd;
2402
2403 cn_id_drbd.idx = cn_idx;
2404 cn_id_drbd.val = CN_VAL_DRBD;
2405
2406 cn_del_callback(&cn_id_drbd);
2407 }
2408
2409 void drbd_nl_send_reply(struct cn_msg *req, int ret_code)
2410 {
2411 char buffer[sizeof(struct cn_msg)+sizeof(struct drbd_nl_cfg_reply)];
2412 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2413 struct drbd_nl_cfg_reply *reply =
2414 (struct drbd_nl_cfg_reply *)cn_reply->data;
2415 int rr;
2416
2417 cn_reply->id = req->id;
2418
2419 cn_reply->seq = req->seq;
2420 cn_reply->ack = req->ack + 1;
2421 cn_reply->len = sizeof(struct drbd_nl_cfg_reply);
2422 cn_reply->flags = 0;
2423
2424 reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor;
2425 reply->ret_code = ret_code;
2426
2427 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2428 if (rr && rr != -ESRCH)
2429 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2430 }
2431
Linux kernel - Deliverables
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