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[net-next-2.6.git] / drivers / block / drbd / drbd_nl.c
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b411b363
PR		 1/*
2 drbd_nl.c
3
4 This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
5
6 Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
7 Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
8 Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
9
10 drbd is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2, or (at your option)
13 any later version.
14
15 drbd is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with drbd; see the file COPYING. If not, write to
22 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
23
24 */
25
b411b363
PR		 26#include <linux/module.h>
27#include <linux/drbd.h>
28#include <linux/in.h>
29#include <linux/fs.h>
30#include <linux/file.h>
31#include <linux/slab.h>
32#include <linux/connector.h>
33#include <linux/blkpg.h>
34#include <linux/cpumask.h>
35#include "drbd_int.h"
b411b363
PR		 36#include "drbd_wrappers.h"
37#include <asm/unaligned.h>
38#include <linux/drbd_tag_magic.h>
39#include <linux/drbd_limits.h>
40
41static unsigned short *tl_add_blob(unsigned short *, enum drbd_tags, const void *, int);
42static unsigned short *tl_add_str(unsigned short *, enum drbd_tags, const char *);
43static unsigned short *tl_add_int(unsigned short *, enum drbd_tags, const void *);
44
45/* see get_sb_bdev and bd_claim */
46static char *drbd_m_holder = "Hands off! this is DRBD's meta data device.";
47
48/* Generate the tag_list to struct functions */
49#define NL_PACKET(name, number, fields) \
50static int name ## _from_tags(struct drbd_conf *mdev, \
51 unsigned short *tags, struct name *arg) __attribute__ ((unused)); \
52static int name ## _from_tags(struct drbd_conf *mdev, \
53 unsigned short *tags, struct name *arg) \
54{ \
55 int tag; \
56 int dlen; \
57 \
58 while ((tag = get_unaligned(tags++)) != TT_END) { \
59 dlen = get_unaligned(tags++); \
60 switch (tag_number(tag)) { \
61 fields \
62 default: \
63 if (tag & T_MANDATORY) { \
64 dev_err(DEV, "Unknown tag: %d\n", tag_number(tag)); \
65 return 0; \
66 } \
67 } \
68 tags = (unsigned short *)((char *)tags + dlen); \
69 } \
70 return 1; \
71}
72#define NL_INTEGER(pn, pr, member) \
73 case pn: /* D_ASSERT( tag_type(tag) == TT_INTEGER ); */ \
74 arg->member = get_unaligned((int *)(tags)); \
75 break;
76#define NL_INT64(pn, pr, member) \
77 case pn: /* D_ASSERT( tag_type(tag) == TT_INT64 ); */ \
78 arg->member = get_unaligned((u64 *)(tags)); \
79 break;
80#define NL_BIT(pn, pr, member) \
81 case pn: /* D_ASSERT( tag_type(tag) == TT_BIT ); */ \
82 arg->member = *(char *)(tags) ? 1 : 0; \
83 break;
84#define NL_STRING(pn, pr, member, len) \
85 case pn: /* D_ASSERT( tag_type(tag) == TT_STRING ); */ \
86 if (dlen > len) { \
87 dev_err(DEV, "arg too long: %s (%u wanted, max len: %u bytes)\n", \
88 #member, dlen, (unsigned int)len); \
89 return 0; \
90 } \
91 arg->member ## _len = dlen; \
92 memcpy(arg->member, tags, min_t(size_t, dlen, len)); \
93 break;
94#include "linux/drbd_nl.h"
95
96/* Generate the struct to tag_list functions */
97#define NL_PACKET(name, number, fields) \
98static unsigned short* \
99name ## _to_tags(struct drbd_conf *mdev, \
100 struct name *arg, unsigned short *tags) __attribute__ ((unused)); \
101static unsigned short* \
102name ## _to_tags(struct drbd_conf *mdev, \
103 struct name *arg, unsigned short *tags) \
104{ \
105 fields \
106 return tags; \
107}
108
109#define NL_INTEGER(pn, pr, member) \
110 put_unaligned(pn | pr | TT_INTEGER, tags++); \
111 put_unaligned(sizeof(int), tags++); \
112 put_unaligned(arg->member, (int *)tags); \
113 tags = (unsigned short *)((char *)tags+sizeof(int));
114#define NL_INT64(pn, pr, member) \
115 put_unaligned(pn | pr | TT_INT64, tags++); \
116 put_unaligned(sizeof(u64), tags++); \
117 put_unaligned(arg->member, (u64 *)tags); \
118 tags = (unsigned short *)((char *)tags+sizeof(u64));
119#define NL_BIT(pn, pr, member) \
120 put_unaligned(pn | pr | TT_BIT, tags++); \
121 put_unaligned(sizeof(char), tags++); \
122 *(char *)tags = arg->member; \
123 tags = (unsigned short *)((char *)tags+sizeof(char));
124#define NL_STRING(pn, pr, member, len) \
125 put_unaligned(pn | pr | TT_STRING, tags++); \
126 put_unaligned(arg->member ## _len, tags++); \
127 memcpy(tags, arg->member, arg->member ## _len); \
128 tags = (unsigned short *)((char *)tags + arg->member ## _len);
129#include "linux/drbd_nl.h"
130
131void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name);
132void drbd_nl_send_reply(struct cn_msg *, int);
133
134int drbd_khelper(struct drbd_conf *mdev, char *cmd)
135{
136 char *envp[] = { "HOME=/",
137 "TERM=linux",
138 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
139 NULL, /* Will be set to address family */
140 NULL, /* Will be set to address */
141 NULL };
142
143 char mb[12], af[20], ad[60], *afs;
144 char *argv[] = {usermode_helper, cmd, mb, NULL };
145 int ret;
146
147 snprintf(mb, 12, "minor-%d", mdev_to_minor(mdev));
148
149 if (get_net_conf(mdev)) {
150 switch (((struct sockaddr *)mdev->net_conf->peer_addr)->sa_family) {
151 case AF_INET6:
152 afs = "ipv6";
153 snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI6",
154 &((struct sockaddr_in6 *)mdev->net_conf->peer_addr)->sin6_addr);
155 break;
156 case AF_INET:
157 afs = "ipv4";
158 snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4",
159 &((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr);
160 break;
161 default:
162 afs = "ssocks";
163 snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4",
164 &((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr);
165 }
166 snprintf(af, 20, "DRBD_PEER_AF=%s", afs);
167 envp[3]=af;
168 envp[4]=ad;
169 put_net_conf(mdev);
170 }
171
172 dev_info(DEV, "helper command: %s %s %s\n", usermode_helper, cmd, mb);
173
174 drbd_bcast_ev_helper(mdev, cmd);
175 ret = call_usermodehelper(usermode_helper, argv, envp, 1);
176 if (ret)
177 dev_warn(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
178 usermode_helper, cmd, mb,
179 (ret >> 8) & 0xff, ret);
180 else
181 dev_info(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
182 usermode_helper, cmd, mb,
183 (ret >> 8) & 0xff, ret);
184
185 if (ret < 0) /* Ignore any ERRNOs we got. */
186 ret = 0;
187
188 return ret;
189}
190
191enum drbd_disk_state drbd_try_outdate_peer(struct drbd_conf *mdev)
192{
193 char *ex_to_string;
194 int r;
195 enum drbd_disk_state nps;
196 enum drbd_fencing_p fp;
197
198 D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
199
200 if (get_ldev_if_state(mdev, D_CONSISTENT)) {
201 fp = mdev->ldev->dc.fencing;
202 put_ldev(mdev);
203 } else {
204 dev_warn(DEV, "Not fencing peer, I'm not even Consistent myself.\n");
205 return mdev->state.pdsk;
206 }
207
208 if (fp == FP_STONITH)
209 _drbd_request_state(mdev, NS(susp, 1), CS_WAIT_COMPLETE);
210
211 r = drbd_khelper(mdev, "fence-peer");
212
213 switch ((r>>8) & 0xff) {
214 case 3: /* peer is inconsistent */
215 ex_to_string = "peer is inconsistent or worse";
216 nps = D_INCONSISTENT;
217 break;
218 case 4: /* peer got outdated, or was already outdated */
219 ex_to_string = "peer was fenced";
220 nps = D_OUTDATED;
221 break;
222 case 5: /* peer was down */
223 if (mdev->state.disk == D_UP_TO_DATE) {
224 /* we will(have) create(d) a new UUID anyways... */
225 ex_to_string = "peer is unreachable, assumed to be dead";
226 nps = D_OUTDATED;
227 } else {
228 ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
229 nps = mdev->state.pdsk;
230 }
231 break;
232 case 6: /* Peer is primary, voluntarily outdate myself.
233 * This is useful when an unconnected R_SECONDARY is asked to
234 * become R_PRIMARY, but finds the other peer being active. */
235 ex_to_string = "peer is active";
236 dev_warn(DEV, "Peer is primary, outdating myself.\n");
237 nps = D_UNKNOWN;
238 _drbd_request_state(mdev, NS(disk, D_OUTDATED), CS_WAIT_COMPLETE);
239 break;
240 case 7:
241 if (fp != FP_STONITH)
242 dev_err(DEV, "fence-peer() = 7 && fencing != Stonith !!!\n");
243 ex_to_string = "peer was stonithed";
244 nps = D_OUTDATED;
245 break;
246 default:
247 /* The script is broken ... */
248 nps = D_UNKNOWN;
249 dev_err(DEV, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
250 return nps;
251 }
252
253 dev_info(DEV, "fence-peer helper returned %d (%s)\n",
254 (r>>8) & 0xff, ex_to_string);
255 return nps;
256}
257
258
259int drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
260{
261 const int max_tries = 4;
262 int r = 0;
263 int try = 0;
264 int forced = 0;
265 union drbd_state mask, val;
266 enum drbd_disk_state nps;
267
268 if (new_role == R_PRIMARY)
269 request_ping(mdev); /* Detect a dead peer ASAP */
270
271 mutex_lock(&mdev->state_mutex);
272
273 mask.i = 0; mask.role = R_MASK;
274 val.i = 0; val.role = new_role;
275
276 while (try++ < max_tries) {
277 r = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE);
278
279 /* in case we first succeeded to outdate,
280 * but now suddenly could establish a connection */
281 if (r == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
282 val.pdsk = 0;
283 mask.pdsk = 0;
284 continue;
285 }
286
287 if (r == SS_NO_UP_TO_DATE_DISK && force &&
288 (mdev->state.disk == D_INCONSISTENT ||
289 mdev->state.disk == D_OUTDATED)) {
290 mask.disk = D_MASK;
291 val.disk = D_UP_TO_DATE;
292 forced = 1;
293 continue;
294 }
295
296 if (r == SS_NO_UP_TO_DATE_DISK &&
297 mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) {
298 D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
299 nps = drbd_try_outdate_peer(mdev);
300
301 if (nps == D_OUTDATED || nps == D_INCONSISTENT) {
302 val.disk = D_UP_TO_DATE;
303 mask.disk = D_MASK;
304 }
305
306 val.pdsk = nps;
307 mask.pdsk = D_MASK;
308
309 continue;
310 }
311
312 if (r == SS_NOTHING_TO_DO)
313 goto fail;
314 if (r == SS_PRIMARY_NOP && mask.pdsk == 0) {
315 nps = drbd_try_outdate_peer(mdev);
316
317 if (force && nps > D_OUTDATED) {
318 dev_warn(DEV, "Forced into split brain situation!\n");
319 nps = D_OUTDATED;
320 }
321
322 mask.pdsk = D_MASK;
323 val.pdsk = nps;
324
325 continue;
326 }
327 if (r == SS_TWO_PRIMARIES) {
328 /* Maybe the peer is detected as dead very soon...
329 retry at most once more in this case. */
330 __set_current_state(TASK_INTERRUPTIBLE);
331 schedule_timeout((mdev->net_conf->ping_timeo+1)*HZ/10);
332 if (try < max_tries)
333 try = max_tries - 1;
334 continue;
335 }
336 if (r < SS_SUCCESS) {
337 r = _drbd_request_state(mdev, mask, val,
338 CS_VERBOSE + CS_WAIT_COMPLETE);
339 if (r < SS_SUCCESS)
340 goto fail;
341 }
342 break;
343 }
344
345 if (r < SS_SUCCESS)
346 goto fail;
347
348 if (forced)
349 dev_warn(DEV, "Forced to consider local data as UpToDate!\n");
350
351 /* Wait until nothing is on the fly :) */
352 wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0);
353
354 if (new_role == R_SECONDARY) {
355 set_disk_ro(mdev->vdisk, TRUE);
356 if (get_ldev(mdev)) {
357 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
358 put_ldev(mdev);
359 }
360 } else {
361 if (get_net_conf(mdev)) {
362 mdev->net_conf->want_lose = 0;
363 put_net_conf(mdev);
364 }
365 set_disk_ro(mdev->vdisk, FALSE);
366 if (get_ldev(mdev)) {
367 if (((mdev->state.conn < C_CONNECTED ||
368 mdev->state.pdsk <= D_FAILED)
369 && mdev->ldev->md.uuid[UI_BITMAP] == 0) || forced)
370 drbd_uuid_new_current(mdev);
371
372 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
373 put_ldev(mdev);
374 }
375 }
376
377 if ((new_role == R_SECONDARY) && get_ldev(mdev)) {
378 drbd_al_to_on_disk_bm(mdev);
379 put_ldev(mdev);
380 }
381
382 if (mdev->state.conn >= C_WF_REPORT_PARAMS) {
383 /* if this was forced, we should consider sync */
384 if (forced)
385 drbd_send_uuids(mdev);
386 drbd_send_state(mdev);
387 }
388
389 drbd_md_sync(mdev);
390
391 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
392 fail:
393 mutex_unlock(&mdev->state_mutex);
394 return r;
395}
396
397
398static int drbd_nl_primary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
399 struct drbd_nl_cfg_reply *reply)
400{
401 struct primary primary_args;
402
403 memset(&primary_args, 0, sizeof(struct primary));
404 if (!primary_from_tags(mdev, nlp->tag_list, &primary_args)) {
405 reply->ret_code = ERR_MANDATORY_TAG;
406 return 0;
407 }
408
409 reply->ret_code =
410 drbd_set_role(mdev, R_PRIMARY, primary_args.overwrite_peer);
411
412 return 0;
413}
414
415static int drbd_nl_secondary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
416 struct drbd_nl_cfg_reply *reply)
417{
418 reply->ret_code = drbd_set_role(mdev, R_SECONDARY, 0);
419
420 return 0;
421}
422
423/* initializes the md.*_offset members, so we are able to find
424 * the on disk meta data */
425static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
426 struct drbd_backing_dev *bdev)
427{
428 sector_t md_size_sect = 0;
429 switch (bdev->dc.meta_dev_idx) {
430 default:
431 /* v07 style fixed size indexed meta data */
432 bdev->md.md_size_sect = MD_RESERVED_SECT;
433 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
434 bdev->md.al_offset = MD_AL_OFFSET;
435 bdev->md.bm_offset = MD_BM_OFFSET;
436 break;
437 case DRBD_MD_INDEX_FLEX_EXT:
438 /* just occupy the full device; unit: sectors */
439 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
440 bdev->md.md_offset = 0;
441 bdev->md.al_offset = MD_AL_OFFSET;
442 bdev->md.bm_offset = MD_BM_OFFSET;
443 break;
444 case DRBD_MD_INDEX_INTERNAL:
445 case DRBD_MD_INDEX_FLEX_INT:
446 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
447 /* al size is still fixed */
448 bdev->md.al_offset = -MD_AL_MAX_SIZE;
449 /* we need (slightly less than) ~ this much bitmap sectors: */
450 md_size_sect = drbd_get_capacity(bdev->backing_bdev);
451 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
452 md_size_sect = BM_SECT_TO_EXT(md_size_sect);
453 md_size_sect = ALIGN(md_size_sect, 8);
454
455 /* plus the "drbd meta data super block",
456 * and the activity log; */
457 md_size_sect += MD_BM_OFFSET;
458
459 bdev->md.md_size_sect = md_size_sect;
460 /* bitmap offset is adjusted by 'super' block size */
461 bdev->md.bm_offset = -md_size_sect + MD_AL_OFFSET;
462 break;
463 }
464}
465
466char *ppsize(char *buf, unsigned long long size)
467{
468 /* Needs 9 bytes at max. */
469 static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
470 int base = 0;
471 while (size >= 10000) {
472 /* shift + round */
473 size = (size >> 10) + !!(size & (1<<9));
474 base++;
475 }
476 sprintf(buf, "%lu %cB", (long)size, units[base]);
477
478 return buf;
479}
480
481/* there is still a theoretical deadlock when called from receiver
482 * on an D_INCONSISTENT R_PRIMARY:
483 * remote READ does inc_ap_bio, receiver would need to receive answer
484 * packet from remote to dec_ap_bio again.
485 * receiver receive_sizes(), comes here,
486 * waits for ap_bio_cnt == 0. -> deadlock.
487 * but this cannot happen, actually, because:
488 * R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable
489 * (not connected, or bad/no disk on peer):
490 * see drbd_fail_request_early, ap_bio_cnt is zero.
491 * R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET:
492 * peer may not initiate a resize.
493 */
494void drbd_suspend_io(struct drbd_conf *mdev)
495{
496 set_bit(SUSPEND_IO, &mdev->flags);
497 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
498}
499
500void drbd_resume_io(struct drbd_conf *mdev)
501{
502 clear_bit(SUSPEND_IO, &mdev->flags);
503 wake_up(&mdev->misc_wait);
504}
505
506/**
507 * drbd_determine_dev_size() - Sets the right device size obeying all constraints
508 * @mdev: DRBD device.
509 *
510 * Returns 0 on success, negative return values indicate errors.
511 * You should call drbd_md_sync() after calling this function.
512 */
513enum determine_dev_size drbd_determin_dev_size(struct drbd_conf *mdev) __must_hold(local)
514{
515 sector_t prev_first_sect, prev_size; /* previous meta location */
516 sector_t la_size;
517 sector_t size;
518 char ppb[10];
519
520 int md_moved, la_size_changed;
521 enum determine_dev_size rv = unchanged;
522
523 /* race:
524 * application request passes inc_ap_bio,
525 * but then cannot get an AL-reference.
526 * this function later may wait on ap_bio_cnt == 0. -> deadlock.
527 *
528 * to avoid that:
529 * Suspend IO right here.
530 * still lock the act_log to not trigger ASSERTs there.
531 */
532 drbd_suspend_io(mdev);
533
534 /* no wait necessary anymore, actually we could assert that */
535 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
536
537 prev_first_sect = drbd_md_first_sector(mdev->ldev);
538 prev_size = mdev->ldev->md.md_size_sect;
539 la_size = mdev->ldev->md.la_size_sect;
540
541 /* TODO: should only be some assert here, not (re)init... */
542 drbd_md_set_sector_offsets(mdev, mdev->ldev);
543
544 size = drbd_new_dev_size(mdev, mdev->ldev);
545
546 if (drbd_get_capacity(mdev->this_bdev) != size ||
547 drbd_bm_capacity(mdev) != size) {
548 int err;
549 err = drbd_bm_resize(mdev, size);
550 if (unlikely(err)) {
551 /* currently there is only one error: ENOMEM! */
552 size = drbd_bm_capacity(mdev)>>1;
553 if (size == 0) {
554 dev_err(DEV, "OUT OF MEMORY! "
555 "Could not allocate bitmap!\n");
556 } else {
557 dev_err(DEV, "BM resizing failed. "
558 "Leaving size unchanged at size = %lu KB\n",
559 (unsigned long)size);
560 }
561 rv = dev_size_error;
562 }
563 /* racy, see comments above. */
564 drbd_set_my_capacity(mdev, size);
565 mdev->ldev->md.la_size_sect = size;
566 dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1),
567 (unsigned long long)size>>1);
568 }
569 if (rv == dev_size_error)
570 goto out;
571
572 la_size_changed = (la_size != mdev->ldev->md.la_size_sect);
573
574 md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev)
575 || prev_size != mdev->ldev->md.md_size_sect;
576
577 if (la_size_changed || md_moved) {
578 drbd_al_shrink(mdev); /* All extents inactive. */
579 dev_info(DEV, "Writing the whole bitmap, %s\n",
580 la_size_changed && md_moved ? "size changed and md moved" :
581 la_size_changed ? "size changed" : "md moved");
582 rv = drbd_bitmap_io(mdev, &drbd_bm_write, "size changed"); /* does drbd_resume_io() ! */
583 drbd_md_mark_dirty(mdev);
584 }
585
586 if (size > la_size)
587 rv = grew;
588 if (size < la_size)
589 rv = shrunk;
590out:
591 lc_unlock(mdev->act_log);
592 wake_up(&mdev->al_wait);
593 drbd_resume_io(mdev);
594
595 return rv;
596}
597
598sector_t
599drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
600{
601 sector_t p_size = mdev->p_size; /* partner's disk size. */
602 sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */
603 sector_t m_size; /* my size */
604 sector_t u_size = bdev->dc.disk_size; /* size requested by user. */
605 sector_t size = 0;
606
607 m_size = drbd_get_max_capacity(bdev);
608
609 if (p_size && m_size) {
610 size = min_t(sector_t, p_size, m_size);
611 } else {
612 if (la_size) {
613 size = la_size;
614 if (m_size && m_size < size)
615 size = m_size;
616 if (p_size && p_size < size)
617 size = p_size;
618 } else {
619 if (m_size)
620 size = m_size;
621 if (p_size)
622 size = p_size;
623 }
624 }
625
626 if (size == 0)
627 dev_err(DEV, "Both nodes diskless!\n");
628
629 if (u_size) {
630 if (u_size > size)
631 dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n",
632 (unsigned long)u_size>>1, (unsigned long)size>>1);
633 else
634 size = u_size;
635 }
636
637 return size;
638}
639
640/**
641 * drbd_check_al_size() - Ensures that the AL is of the right size
642 * @mdev: DRBD device.
643 *
644 * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
645 * failed, and 0 on success. You should call drbd_md_sync() after you called
646 * this function.
647 */
648static int drbd_check_al_size(struct drbd_conf *mdev)
649{
650 struct lru_cache *n, *t;
651 struct lc_element *e;
652 unsigned int in_use;
653 int i;
654
655 ERR_IF(mdev->sync_conf.al_extents < 7)
656 mdev->sync_conf.al_extents = 127;
657
658 if (mdev->act_log &&
659 mdev->act_log->nr_elements == mdev->sync_conf.al_extents)
660 return 0;
661
662 in_use = 0;
663 t = mdev->act_log;
664 n = lc_create("act_log", drbd_al_ext_cache,
665 mdev->sync_conf.al_extents, sizeof(struct lc_element), 0);
666
667 if (n == NULL) {
668 dev_err(DEV, "Cannot allocate act_log lru!\n");
669 return -ENOMEM;
670 }
671 spin_lock_irq(&mdev->al_lock);
672 if (t) {
673 for (i = 0; i < t->nr_elements; i++) {
674 e = lc_element_by_index(t, i);
675 if (e->refcnt)
676 dev_err(DEV, "refcnt(%d)==%d\n",
677 e->lc_number, e->refcnt);
678 in_use += e->refcnt;
679 }
680 }
681 if (!in_use)
682 mdev->act_log = n;
683 spin_unlock_irq(&mdev->al_lock);
684 if (in_use) {
685 dev_err(DEV, "Activity log still in use!\n");
686 lc_destroy(n);
687 return -EBUSY;
688 } else {
689 if (t)
690 lc_destroy(t);
691 }
692 drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */
693 return 0;
694}
695
696void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_seg_s) __must_hold(local)
697{
698 struct request_queue * const q = mdev->rq_queue;
699 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
700 int max_segments = mdev->ldev->dc.max_bio_bvecs;
701
702 if (b->merge_bvec_fn && !mdev->ldev->dc.use_bmbv)
703 max_seg_s = PAGE_SIZE;
704
705 max_seg_s = min(queue_max_sectors(b) * queue_logical_block_size(b), max_seg_s);
706
707 blk_queue_max_sectors(q, max_seg_s >> 9);
708 blk_queue_max_phys_segments(q, max_segments ? max_segments : MAX_PHYS_SEGMENTS);
709 blk_queue_max_hw_segments(q, max_segments ? max_segments : MAX_HW_SEGMENTS);
710 blk_queue_max_segment_size(q, max_seg_s);
711 blk_queue_logical_block_size(q, 512);
712 blk_queue_segment_boundary(q, PAGE_SIZE-1);
713 blk_stack_limits(&q->limits, &b->limits, 0);
714
715 if (b->merge_bvec_fn)
716 dev_warn(DEV, "Backing device's merge_bvec_fn() = %p\n",
717 b->merge_bvec_fn);
718 dev_info(DEV, "max_segment_size ( = BIO size ) = %u\n", queue_max_segment_size(q));
719
720 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
721 dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
722 q->backing_dev_info.ra_pages,
723 b->backing_dev_info.ra_pages);
724 q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
725 }
726}
727
728/* serialize deconfig (worker exiting, doing cleanup)
729 * and reconfig (drbdsetup disk, drbdsetup net)
730 *
731 * wait for a potentially exiting worker, then restart it,
732 * or start a new one.
733 */
734static void drbd_reconfig_start(struct drbd_conf *mdev)
735{
6c6c7951 736 wait_event(mdev->state_wait, !test_and_set_bit(CONFIG_PENDING, &mdev->flags));
b411b363
PR		 737 wait_event(mdev->state_wait, !test_bit(DEVICE_DYING, &mdev->flags));
738 drbd_thread_start(&mdev->worker);
739}
740
741/* if still unconfigured, stops worker again.
742 * if configured now, clears CONFIG_PENDING.
743 * wakes potential waiters */
744static void drbd_reconfig_done(struct drbd_conf *mdev)
745{
746 spin_lock_irq(&mdev->req_lock);
747 if (mdev->state.disk == D_DISKLESS &&
748 mdev->state.conn == C_STANDALONE &&
749 mdev->state.role == R_SECONDARY) {
750 set_bit(DEVICE_DYING, &mdev->flags);
751 drbd_thread_stop_nowait(&mdev->worker);
752 } else
753 clear_bit(CONFIG_PENDING, &mdev->flags);
754 spin_unlock_irq(&mdev->req_lock);
755 wake_up(&mdev->state_wait);
756}
757
758/* does always return 0;
759 * interesting return code is in reply->ret_code */
760static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
761 struct drbd_nl_cfg_reply *reply)
762{
763 enum drbd_ret_codes retcode;
764 enum determine_dev_size dd;
765 sector_t max_possible_sectors;
766 sector_t min_md_device_sectors;
767 struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
768 struct inode *inode, *inode2;
769 struct lru_cache *resync_lru = NULL;
770 union drbd_state ns, os;
771 int rv;
772 int cp_discovered = 0;
773 int logical_block_size;
774
775 drbd_reconfig_start(mdev);
776
777 /* if you want to reconfigure, please tear down first */
778 if (mdev->state.disk > D_DISKLESS) {
779 retcode = ERR_DISK_CONFIGURED;
780 goto fail;
781 }
782
783 /* allocation not in the IO path, cqueue thread context */
784 nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
785 if (!nbc) {
786 retcode = ERR_NOMEM;
787 goto fail;
788 }
789
790 nbc->dc.disk_size = DRBD_DISK_SIZE_SECT_DEF;
791 nbc->dc.on_io_error = DRBD_ON_IO_ERROR_DEF;
792 nbc->dc.fencing = DRBD_FENCING_DEF;
793 nbc->dc.max_bio_bvecs = DRBD_MAX_BIO_BVECS_DEF;
794
795 if (!disk_conf_from_tags(mdev, nlp->tag_list, &nbc->dc)) {
796 retcode = ERR_MANDATORY_TAG;
797 goto fail;
798 }
799
800 if (nbc->dc.meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
801 retcode = ERR_MD_IDX_INVALID;
802 goto fail;
803 }
804
805 nbc->lo_file = filp_open(nbc->dc.backing_dev, O_RDWR, 0);
806 if (IS_ERR(nbc->lo_file)) {
807 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev,
808 PTR_ERR(nbc->lo_file));
809 nbc->lo_file = NULL;
810 retcode = ERR_OPEN_DISK;
811 goto fail;
812 }
813
814 inode = nbc->lo_file->f_dentry->d_inode;
815
816 if (!S_ISBLK(inode->i_mode)) {
817 retcode = ERR_DISK_NOT_BDEV;
818 goto fail;
819 }
820
821 nbc->md_file = filp_open(nbc->dc.meta_dev, O_RDWR, 0);
822 if (IS_ERR(nbc->md_file)) {
823 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev,
824 PTR_ERR(nbc->md_file));
825 nbc->md_file = NULL;
826 retcode = ERR_OPEN_MD_DISK;
827 goto fail;
828 }
829
830 inode2 = nbc->md_file->f_dentry->d_inode;
831
832 if (!S_ISBLK(inode2->i_mode)) {
833 retcode = ERR_MD_NOT_BDEV;
834 goto fail;
835 }
836
837 nbc->backing_bdev = inode->i_bdev;
838 if (bd_claim(nbc->backing_bdev, mdev)) {
839 printk(KERN_ERR "drbd: bd_claim(%p,%p); failed [%p;%p;%u]\n",
840 nbc->backing_bdev, mdev,
841 nbc->backing_bdev->bd_holder,
842 nbc->backing_bdev->bd_contains->bd_holder,
843 nbc->backing_bdev->bd_holders);
844 retcode = ERR_BDCLAIM_DISK;
845 goto fail;
846 }
847
848 resync_lru = lc_create("resync", drbd_bm_ext_cache,
849 61, sizeof(struct bm_extent),
850 offsetof(struct bm_extent, lce));
851 if (!resync_lru) {
852 retcode = ERR_NOMEM;
853 goto release_bdev_fail;
854 }
855
856 /* meta_dev_idx >= 0: external fixed size,
857 * possibly multiple drbd sharing one meta device.
858 * TODO in that case, paranoia check that [md_bdev, meta_dev_idx] is
859 * not yet used by some other drbd minor!
860 * (if you use drbd.conf + drbdadm,
861 * that should check it for you already; but if you don't, or someone
862 * fooled it, we need to double check here) */
863 nbc->md_bdev = inode2->i_bdev;
864 if (bd_claim(nbc->md_bdev, (nbc->dc.meta_dev_idx < 0) ? (void *)mdev
865 : (void *) drbd_m_holder)) {
866 retcode = ERR_BDCLAIM_MD_DISK;
867 goto release_bdev_fail;
868 }
869
870 if ((nbc->backing_bdev == nbc->md_bdev) !=
871 (nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
872 nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
873 retcode = ERR_MD_IDX_INVALID;
874 goto release_bdev2_fail;
875 }
876
877 /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
878 drbd_md_set_sector_offsets(mdev, nbc);
879
880 if (drbd_get_max_capacity(nbc) < nbc->dc.disk_size) {
881 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
882 (unsigned long long) drbd_get_max_capacity(nbc),
883 (unsigned long long) nbc->dc.disk_size);
884 retcode = ERR_DISK_TO_SMALL;
885 goto release_bdev2_fail;
886 }
887
888 if (nbc->dc.meta_dev_idx < 0) {
889 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
890 /* at least one MB, otherwise it does not make sense */
891 min_md_device_sectors = (2<<10);
892 } else {
893 max_possible_sectors = DRBD_MAX_SECTORS;
894 min_md_device_sectors = MD_RESERVED_SECT * (nbc->dc.meta_dev_idx + 1);
895 }
896
b411b363
PR		 897 if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
898 retcode = ERR_MD_DISK_TO_SMALL;
899 dev_warn(DEV, "refusing attach: md-device too small, "
900 "at least %llu sectors needed for this meta-disk type\n",
901 (unsigned long long) min_md_device_sectors);
902 goto release_bdev2_fail;
903 }
904
905 /* Make sure the new disk is big enough
906 * (we may currently be R_PRIMARY with no local disk...) */
907 if (drbd_get_max_capacity(nbc) <
908 drbd_get_capacity(mdev->this_bdev)) {
909 retcode = ERR_DISK_TO_SMALL;
910 goto release_bdev2_fail;
911 }
912
913 nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
914
1352994b
LE		 915 if (nbc->known_size > max_possible_sectors) {
916 dev_warn(DEV, "==> truncating very big lower level device "
917 "to currently maximum possible %llu sectors <==\n",
918 (unsigned long long) max_possible_sectors);
919 if (nbc->dc.meta_dev_idx >= 0)
920 dev_warn(DEV, "==>> using internal or flexible "
921 "meta data may help <<==\n");
922 }
923
b411b363
PR		 924 drbd_suspend_io(mdev);
925 /* also wait for the last barrier ack. */
926 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt));
927 /* and for any other previously queued work */
928 drbd_flush_workqueue(mdev);
929
930 retcode = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
931 drbd_resume_io(mdev);
932 if (retcode < SS_SUCCESS)
933 goto release_bdev2_fail;
934
935 if (!get_ldev_if_state(mdev, D_ATTACHING))
936 goto force_diskless;
937
938 drbd_md_set_sector_offsets(mdev, nbc);
939
940 if (!mdev->bitmap) {
941 if (drbd_bm_init(mdev)) {
942 retcode = ERR_NOMEM;
943 goto force_diskless_dec;
944 }
945 }
946
947 retcode = drbd_md_read(mdev, nbc);
948 if (retcode != NO_ERROR)
949 goto force_diskless_dec;
950
951 if (mdev->state.conn < C_CONNECTED &&
952 mdev->state.role == R_PRIMARY &&
953 (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
954 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
955 (unsigned long long)mdev->ed_uuid);
956 retcode = ERR_DATA_NOT_CURRENT;
957 goto force_diskless_dec;
958 }
959
960 /* Since we are diskless, fix the activity log first... */
961 if (drbd_check_al_size(mdev)) {
962 retcode = ERR_NOMEM;
963 goto force_diskless_dec;
964 }
965
966 /* Prevent shrinking of consistent devices ! */
967 if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
968 drbd_new_dev_size(mdev, nbc) < nbc->md.la_size_sect) {
969 dev_warn(DEV, "refusing to truncate a consistent device\n");
970 retcode = ERR_DISK_TO_SMALL;
971 goto force_diskless_dec;
972 }
973
974 if (!drbd_al_read_log(mdev, nbc)) {
975 retcode = ERR_IO_MD_DISK;
976 goto force_diskless_dec;
977 }
978
979 /* allocate a second IO page if logical_block_size != 512 */
980 logical_block_size = bdev_logical_block_size(nbc->md_bdev);
981 if (logical_block_size == 0)
982 logical_block_size = MD_SECTOR_SIZE;
983
984 if (logical_block_size != MD_SECTOR_SIZE) {
985 if (!mdev->md_io_tmpp) {
986 struct page *page = alloc_page(GFP_NOIO);
987 if (!page)
988 goto force_diskless_dec;
989
990 dev_warn(DEV, "Meta data's bdev logical_block_size = %d != %d\n",
991 logical_block_size, MD_SECTOR_SIZE);
992 dev_warn(DEV, "Workaround engaged (has performance impact).\n");
993
994 mdev->md_io_tmpp = page;
995 }
996 }
997
998 /* Reset the "barriers don't work" bits here, then force meta data to
999 * be written, to ensure we determine if barriers are supported. */
1000 if (nbc->dc.no_md_flush)
1001 set_bit(MD_NO_BARRIER, &mdev->flags);
1002 else
1003 clear_bit(MD_NO_BARRIER, &mdev->flags);
1004
1005 /* Point of no return reached.
1006 * Devices and memory are no longer released by error cleanup below.
1007 * now mdev takes over responsibility, and the state engine should
1008 * clean it up somewhere. */
1009 D_ASSERT(mdev->ldev == NULL);
1010 mdev->ldev = nbc;
1011 mdev->resync = resync_lru;
1012 nbc = NULL;
1013 resync_lru = NULL;
1014
1015 mdev->write_ordering = WO_bio_barrier;
1016 drbd_bump_write_ordering(mdev, WO_bio_barrier);
1017
1018 if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
1019 set_bit(CRASHED_PRIMARY, &mdev->flags);
1020 else
1021 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1022
1023 if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND)) {
1024 set_bit(CRASHED_PRIMARY, &mdev->flags);
1025 cp_discovered = 1;
1026 }
1027
1028 mdev->send_cnt = 0;
1029 mdev->recv_cnt = 0;
1030 mdev->read_cnt = 0;
1031 mdev->writ_cnt = 0;
1032
1033 drbd_setup_queue_param(mdev, DRBD_MAX_SEGMENT_SIZE);
1034
1035 /* If I am currently not R_PRIMARY,
1036 * but meta data primary indicator is set,
1037 * I just now recover from a hard crash,
1038 * and have been R_PRIMARY before that crash.
1039 *
1040 * Now, if I had no connection before that crash
1041 * (have been degraded R_PRIMARY), chances are that
1042 * I won't find my peer now either.
1043 *
1044 * In that case, and _only_ in that case,
1045 * we use the degr-wfc-timeout instead of the default,
1046 * so we can automatically recover from a crash of a
1047 * degraded but active "cluster" after a certain timeout.
1048 */
1049 clear_bit(USE_DEGR_WFC_T, &mdev->flags);
1050 if (mdev->state.role != R_PRIMARY &&
1051 drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1052 !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
1053 set_bit(USE_DEGR_WFC_T, &mdev->flags);
1054
1055 dd = drbd_determin_dev_size(mdev);
1056 if (dd == dev_size_error) {
1057 retcode = ERR_NOMEM_BITMAP;
1058 goto force_diskless_dec;
1059 } else if (dd == grew)
1060 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
1061
1062 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
1063 dev_info(DEV, "Assuming that all blocks are out of sync "
1064 "(aka FullSync)\n");
1065 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from attaching")) {
1066 retcode = ERR_IO_MD_DISK;
1067 goto force_diskless_dec;
1068 }
1069 } else {
1070 if (drbd_bitmap_io(mdev, &drbd_bm_read, "read from attaching") < 0) {
1071 retcode = ERR_IO_MD_DISK;
1072 goto force_diskless_dec;
1073 }
1074 }
1075
1076 if (cp_discovered) {
1077 drbd_al_apply_to_bm(mdev);
1078 drbd_al_to_on_disk_bm(mdev);
1079 }
1080
1081 spin_lock_irq(&mdev->req_lock);
1082 os = mdev->state;
1083 ns.i = os.i;
1084 /* If MDF_CONSISTENT is not set go into inconsistent state,
1085 otherwise investigate MDF_WasUpToDate...
1086 If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1087 otherwise into D_CONSISTENT state.
1088 */
1089 if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
1090 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
1091 ns.disk = D_CONSISTENT;
1092 else
1093 ns.disk = D_OUTDATED;
1094 } else {
1095 ns.disk = D_INCONSISTENT;
1096 }
1097
1098 if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
1099 ns.pdsk = D_OUTDATED;
1100
1101 if ( ns.disk == D_CONSISTENT &&
1102 (ns.pdsk == D_OUTDATED || mdev->ldev->dc.fencing == FP_DONT_CARE))
1103 ns.disk = D_UP_TO_DATE;
1104
1105 /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1106 MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1107 this point, because drbd_request_state() modifies these
1108 flags. */
1109
1110 /* In case we are C_CONNECTED postpone any decision on the new disk
1111 state after the negotiation phase. */
1112 if (mdev->state.conn == C_CONNECTED) {
1113 mdev->new_state_tmp.i = ns.i;
1114 ns.i = os.i;
1115 ns.disk = D_NEGOTIATING;
1116 }
1117
1118 rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
1119 ns = mdev->state;
1120 spin_unlock_irq(&mdev->req_lock);
1121
1122 if (rv < SS_SUCCESS)
1123 goto force_diskless_dec;
1124
1125 if (mdev->state.role == R_PRIMARY)
1126 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
1127 else
1128 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1129
1130 drbd_md_mark_dirty(mdev);
1131 drbd_md_sync(mdev);
1132
1133 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1134 put_ldev(mdev);
1135 reply->ret_code = retcode;
1136 drbd_reconfig_done(mdev);
1137 return 0;
1138
1139 force_diskless_dec:
1140 put_ldev(mdev);
1141 force_diskless:
1142 drbd_force_state(mdev, NS(disk, D_DISKLESS));
1143 drbd_md_sync(mdev);
1144 release_bdev2_fail:
1145 if (nbc)
1146 bd_release(nbc->md_bdev);
1147 release_bdev_fail:
1148 if (nbc)
1149 bd_release(nbc->backing_bdev);
1150 fail:
1151 if (nbc) {
1152 if (nbc->lo_file)
1153 fput(nbc->lo_file);
1154 if (nbc->md_file)
1155 fput(nbc->md_file);
1156 kfree(nbc);
1157 }
1158 lc_destroy(resync_lru);
1159
1160 reply->ret_code = retcode;
1161 drbd_reconfig_done(mdev);
1162 return 0;
1163}
1164
1165static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1166 struct drbd_nl_cfg_reply *reply)
1167{
1168 reply->ret_code = drbd_request_state(mdev, NS(disk, D_DISKLESS));
1169 return 0;
1170}
1171
1172static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1173 struct drbd_nl_cfg_reply *reply)
1174{
1175 int i, ns;
1176 enum drbd_ret_codes retcode;
1177 struct net_conf *new_conf = NULL;
1178 struct crypto_hash *tfm = NULL;
1179 struct crypto_hash *integrity_w_tfm = NULL;
1180 struct crypto_hash *integrity_r_tfm = NULL;
1181 struct hlist_head *new_tl_hash = NULL;
1182 struct hlist_head *new_ee_hash = NULL;
1183 struct drbd_conf *odev;
1184 char hmac_name[CRYPTO_MAX_ALG_NAME];
1185 void *int_dig_out = NULL;
1186 void *int_dig_in = NULL;
1187 void *int_dig_vv = NULL;
1188 struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr;
1189
1190 drbd_reconfig_start(mdev);
1191
1192 if (mdev->state.conn > C_STANDALONE) {
1193 retcode = ERR_NET_CONFIGURED;
1194 goto fail;
1195 }
1196
1197 /* allocation not in the IO path, cqueue thread context */
1198 new_conf = kmalloc(sizeof(struct net_conf), GFP_KERNEL);
1199 if (!new_conf) {
1200 retcode = ERR_NOMEM;
1201 goto fail;
1202 }
1203
1204 memset(new_conf, 0, sizeof(struct net_conf));
1205 new_conf->timeout = DRBD_TIMEOUT_DEF;
1206 new_conf->try_connect_int = DRBD_CONNECT_INT_DEF;
1207 new_conf->ping_int = DRBD_PING_INT_DEF;
1208 new_conf->max_epoch_size = DRBD_MAX_EPOCH_SIZE_DEF;
1209 new_conf->max_buffers = DRBD_MAX_BUFFERS_DEF;
1210 new_conf->unplug_watermark = DRBD_UNPLUG_WATERMARK_DEF;
1211 new_conf->sndbuf_size = DRBD_SNDBUF_SIZE_DEF;
1212 new_conf->rcvbuf_size = DRBD_RCVBUF_SIZE_DEF;
1213 new_conf->ko_count = DRBD_KO_COUNT_DEF;
1214 new_conf->after_sb_0p = DRBD_AFTER_SB_0P_DEF;
1215 new_conf->after_sb_1p = DRBD_AFTER_SB_1P_DEF;
1216 new_conf->after_sb_2p = DRBD_AFTER_SB_2P_DEF;
1217 new_conf->want_lose = 0;
1218 new_conf->two_primaries = 0;
1219 new_conf->wire_protocol = DRBD_PROT_C;
1220 new_conf->ping_timeo = DRBD_PING_TIMEO_DEF;
1221 new_conf->rr_conflict = DRBD_RR_CONFLICT_DEF;
1222
1223 if (!net_conf_from_tags(mdev, nlp->tag_list, new_conf)) {
1224 retcode = ERR_MANDATORY_TAG;
1225 goto fail;
1226 }
1227
1228 if (new_conf->two_primaries
1229 && (new_conf->wire_protocol != DRBD_PROT_C)) {
1230 retcode = ERR_NOT_PROTO_C;
1231 goto fail;
1232 };
1233
1234 if (mdev->state.role == R_PRIMARY && new_conf->want_lose) {
1235 retcode = ERR_DISCARD;
1236 goto fail;
1237 }
1238
1239 retcode = NO_ERROR;
1240
1241 new_my_addr = (struct sockaddr *)&new_conf->my_addr;
1242 new_peer_addr = (struct sockaddr *)&new_conf->peer_addr;
1243 for (i = 0; i < minor_count; i++) {
1244 odev = minor_to_mdev(i);
1245 if (!odev || odev == mdev)
1246 continue;
1247 if (get_net_conf(odev)) {
1248 taken_addr = (struct sockaddr *)&odev->net_conf->my_addr;
1249 if (new_conf->my_addr_len == odev->net_conf->my_addr_len &&
1250 !memcmp(new_my_addr, taken_addr, new_conf->my_addr_len))
1251 retcode = ERR_LOCAL_ADDR;
1252
1253 taken_addr = (struct sockaddr *)&odev->net_conf->peer_addr;
1254 if (new_conf->peer_addr_len == odev->net_conf->peer_addr_len &&
1255 !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len))
1256 retcode = ERR_PEER_ADDR;
1257
1258 put_net_conf(odev);
1259 if (retcode != NO_ERROR)
1260 goto fail;
1261 }
1262 }
1263
1264 if (new_conf->cram_hmac_alg[0] != 0) {
1265 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
1266 new_conf->cram_hmac_alg);
1267 tfm = crypto_alloc_hash(hmac_name, 0, CRYPTO_ALG_ASYNC);
1268 if (IS_ERR(tfm)) {
1269 tfm = NULL;
1270 retcode = ERR_AUTH_ALG;
1271 goto fail;
1272 }
1273
8b43aebd 1274 if (crypto_tfm_alg_type(crypto_hash_tfm(tfm)) != CRYPTO_ALG_TYPE_SHASH) {
b411b363
PR		 1275 retcode = ERR_AUTH_ALG_ND;
1276 goto fail;
1277 }
1278 }
1279
1280 if (new_conf->integrity_alg[0]) {
1281 integrity_w_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1282 if (IS_ERR(integrity_w_tfm)) {
1283 integrity_w_tfm = NULL;
1284 retcode=ERR_INTEGRITY_ALG;
1285 goto fail;
1286 }
1287
1288 if (!drbd_crypto_is_hash(crypto_hash_tfm(integrity_w_tfm))) {
1289 retcode=ERR_INTEGRITY_ALG_ND;
1290 goto fail;
1291 }
1292
1293 integrity_r_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1294 if (IS_ERR(integrity_r_tfm)) {
1295 integrity_r_tfm = NULL;
1296 retcode=ERR_INTEGRITY_ALG;
1297 goto fail;
1298 }
1299 }
1300
1301 ns = new_conf->max_epoch_size/8;
1302 if (mdev->tl_hash_s != ns) {
1303 new_tl_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
1304 if (!new_tl_hash) {
1305 retcode = ERR_NOMEM;
1306 goto fail;
1307 }
1308 }
1309
1310 ns = new_conf->max_buffers/8;
1311 if (new_conf->two_primaries && (mdev->ee_hash_s != ns)) {
1312 new_ee_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
1313 if (!new_ee_hash) {
1314 retcode = ERR_NOMEM;
1315 goto fail;
1316 }
1317 }
1318
1319 ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
1320
1321 if (integrity_w_tfm) {
1322 i = crypto_hash_digestsize(integrity_w_tfm);
1323 int_dig_out = kmalloc(i, GFP_KERNEL);
1324 if (!int_dig_out) {
1325 retcode = ERR_NOMEM;
1326 goto fail;
1327 }
1328 int_dig_in = kmalloc(i, GFP_KERNEL);
1329 if (!int_dig_in) {
1330 retcode = ERR_NOMEM;
1331 goto fail;
1332 }
1333 int_dig_vv = kmalloc(i, GFP_KERNEL);
1334 if (!int_dig_vv) {
1335 retcode = ERR_NOMEM;
1336 goto fail;
1337 }
1338 }
1339
1340 if (!mdev->bitmap) {
1341 if(drbd_bm_init(mdev)) {
1342 retcode = ERR_NOMEM;
1343 goto fail;
1344 }
1345 }
1346
1347 spin_lock_irq(&mdev->req_lock);
1348 if (mdev->net_conf != NULL) {
1349 retcode = ERR_NET_CONFIGURED;
1350 spin_unlock_irq(&mdev->req_lock);
1351 goto fail;
1352 }
1353 mdev->net_conf = new_conf;
1354
1355 mdev->send_cnt = 0;
1356 mdev->recv_cnt = 0;
1357
1358 if (new_tl_hash) {
1359 kfree(mdev->tl_hash);
1360 mdev->tl_hash_s = mdev->net_conf->max_epoch_size/8;
1361 mdev->tl_hash = new_tl_hash;
1362 }
1363
1364 if (new_ee_hash) {
1365 kfree(mdev->ee_hash);
1366 mdev->ee_hash_s = mdev->net_conf->max_buffers/8;
1367 mdev->ee_hash = new_ee_hash;
1368 }
1369
1370 crypto_free_hash(mdev->cram_hmac_tfm);
1371 mdev->cram_hmac_tfm = tfm;
1372
1373 crypto_free_hash(mdev->integrity_w_tfm);
1374 mdev->integrity_w_tfm = integrity_w_tfm;
1375
1376 crypto_free_hash(mdev->integrity_r_tfm);
1377 mdev->integrity_r_tfm = integrity_r_tfm;
1378
1379 kfree(mdev->int_dig_out);
1380 kfree(mdev->int_dig_in);
1381 kfree(mdev->int_dig_vv);
1382 mdev->int_dig_out=int_dig_out;
1383 mdev->int_dig_in=int_dig_in;
1384 mdev->int_dig_vv=int_dig_vv;
1385 spin_unlock_irq(&mdev->req_lock);
1386
1387 retcode = _drbd_request_state(mdev, NS(conn, C_UNCONNECTED), CS_VERBOSE);
1388
1389 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1390 reply->ret_code = retcode;
1391 drbd_reconfig_done(mdev);
1392 return 0;
1393
1394fail:
1395 kfree(int_dig_out);
1396 kfree(int_dig_in);
1397 kfree(int_dig_vv);
1398 crypto_free_hash(tfm);
1399 crypto_free_hash(integrity_w_tfm);
1400 crypto_free_hash(integrity_r_tfm);
1401 kfree(new_tl_hash);
1402 kfree(new_ee_hash);
1403 kfree(new_conf);
1404
1405 reply->ret_code = retcode;
1406 drbd_reconfig_done(mdev);
1407 return 0;
1408}
1409
1410static int drbd_nl_disconnect(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1411 struct drbd_nl_cfg_reply *reply)
1412{
1413 int retcode;
1414
1415 retcode = _drbd_request_state(mdev, NS(conn, C_DISCONNECTING), CS_ORDERED);
1416
1417 if (retcode == SS_NOTHING_TO_DO)
1418 goto done;
1419 else if (retcode == SS_ALREADY_STANDALONE)
1420 goto done;
1421 else if (retcode == SS_PRIMARY_NOP) {
1422 /* Our statche checking code wants to see the peer outdated. */
1423 retcode = drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
1424 pdsk, D_OUTDATED));
1425 } else if (retcode == SS_CW_FAILED_BY_PEER) {
1426 /* The peer probably wants to see us outdated. */
1427 retcode = _drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
1428 disk, D_OUTDATED),
1429 CS_ORDERED);
1430 if (retcode == SS_IS_DISKLESS || retcode == SS_LOWER_THAN_OUTDATED) {
1431 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
1432 retcode = SS_SUCCESS;
1433 }
1434 }
1435
1436 if (retcode < SS_SUCCESS)
1437 goto fail;
1438
1439 if (wait_event_interruptible(mdev->state_wait,
1440 mdev->state.conn != C_DISCONNECTING)) {
1441 /* Do not test for mdev->state.conn == C_STANDALONE, since
1442 someone else might connect us in the mean time! */
1443 retcode = ERR_INTR;
1444 goto fail;
1445 }
1446
1447 done:
1448 retcode = NO_ERROR;
1449 fail:
1450 drbd_md_sync(mdev);
1451 reply->ret_code = retcode;
1452 return 0;
1453}
1454
1455void resync_after_online_grow(struct drbd_conf *mdev)
1456{
1457 int iass; /* I am sync source */
1458
1459 dev_info(DEV, "Resync of new storage after online grow\n");
1460 if (mdev->state.role != mdev->state.peer)
1461 iass = (mdev->state.role == R_PRIMARY);
1462 else
1463 iass = test_bit(DISCARD_CONCURRENT, &mdev->flags);
1464
1465 if (iass)
1466 drbd_start_resync(mdev, C_SYNC_SOURCE);
1467 else
1468 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
1469}
1470
1471static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1472 struct drbd_nl_cfg_reply *reply)
1473{
1474 struct resize rs;
1475 int retcode = NO_ERROR;
1476 int ldsc = 0; /* local disk size changed */
1477 enum determine_dev_size dd;
1478
1479 memset(&rs, 0, sizeof(struct resize));
1480 if (!resize_from_tags(mdev, nlp->tag_list, &rs)) {
1481 retcode = ERR_MANDATORY_TAG;
1482 goto fail;
1483 }
1484
1485 if (mdev->state.conn > C_CONNECTED) {
1486 retcode = ERR_RESIZE_RESYNC;
1487 goto fail;
1488 }
1489
1490 if (mdev->state.role == R_SECONDARY &&
1491 mdev->state.peer == R_SECONDARY) {
1492 retcode = ERR_NO_PRIMARY;
1493 goto fail;
1494 }
1495
1496 if (!get_ldev(mdev)) {
1497 retcode = ERR_NO_DISK;
1498 goto fail;
1499 }
1500
1501 if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) {
1502 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
1503 ldsc = 1;
1504 }
1505
1506 mdev->ldev->dc.disk_size = (sector_t)rs.resize_size;
1507 dd = drbd_determin_dev_size(mdev);
1508 drbd_md_sync(mdev);
1509 put_ldev(mdev);
1510 if (dd == dev_size_error) {
1511 retcode = ERR_NOMEM_BITMAP;
1512 goto fail;
1513 }
1514
1515 if (mdev->state.conn == C_CONNECTED && (dd != unchanged || ldsc)) {
1516 if (dd == grew)
1517 set_bit(RESIZE_PENDING, &mdev->flags);
1518
1519 drbd_send_uuids(mdev);
1520 drbd_send_sizes(mdev, 1);
1521 }
1522
1523 fail:
1524 reply->ret_code = retcode;
1525 return 0;
1526}
1527
1528static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1529 struct drbd_nl_cfg_reply *reply)
1530{
1531 int retcode = NO_ERROR;
1532 int err;
1533 int ovr; /* online verify running */
1534 int rsr; /* re-sync running */
1535 struct crypto_hash *verify_tfm = NULL;
1536 struct crypto_hash *csums_tfm = NULL;
1537 struct syncer_conf sc;
1538 cpumask_var_t new_cpu_mask;
1539
1540 if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) {
1541 retcode = ERR_NOMEM;
1542 goto fail;
1543 }
1544
1545 if (nlp->flags & DRBD_NL_SET_DEFAULTS) {
1546 memset(&sc, 0, sizeof(struct syncer_conf));
1547 sc.rate = DRBD_RATE_DEF;
1548 sc.after = DRBD_AFTER_DEF;
1549 sc.al_extents = DRBD_AL_EXTENTS_DEF;
1550 } else
1551 memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf));
1552
1553 if (!syncer_conf_from_tags(mdev, nlp->tag_list, &sc)) {
1554 retcode = ERR_MANDATORY_TAG;
1555 goto fail;
1556 }
1557
1558 /* re-sync running */
1559 rsr = ( mdev->state.conn == C_SYNC_SOURCE ||
1560 mdev->state.conn == C_SYNC_TARGET ||
1561 mdev->state.conn == C_PAUSED_SYNC_S ||
1562 mdev->state.conn == C_PAUSED_SYNC_T );
1563
1564 if (rsr && strcmp(sc.csums_alg, mdev->sync_conf.csums_alg)) {
1565 retcode = ERR_CSUMS_RESYNC_RUNNING;
1566 goto fail;
1567 }
1568
1569 if (!rsr && sc.csums_alg[0]) {
1570 csums_tfm = crypto_alloc_hash(sc.csums_alg, 0, CRYPTO_ALG_ASYNC);
1571 if (IS_ERR(csums_tfm)) {
1572 csums_tfm = NULL;
1573 retcode = ERR_CSUMS_ALG;
1574 goto fail;
1575 }
1576
1577 if (!drbd_crypto_is_hash(crypto_hash_tfm(csums_tfm))) {
1578 retcode = ERR_CSUMS_ALG_ND;
1579 goto fail;
1580 }
1581 }
1582
1583 /* online verify running */
1584 ovr = (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T);
1585
1586 if (ovr) {
1587 if (strcmp(sc.verify_alg, mdev->sync_conf.verify_alg)) {
1588 retcode = ERR_VERIFY_RUNNING;
1589 goto fail;
1590 }
1591 }
1592
1593 if (!ovr && sc.verify_alg[0]) {
1594 verify_tfm = crypto_alloc_hash(sc.verify_alg, 0, CRYPTO_ALG_ASYNC);
1595 if (IS_ERR(verify_tfm)) {
1596 verify_tfm = NULL;
1597 retcode = ERR_VERIFY_ALG;
1598 goto fail;
1599 }
1600
1601 if (!drbd_crypto_is_hash(crypto_hash_tfm(verify_tfm))) {
1602 retcode = ERR_VERIFY_ALG_ND;
1603 goto fail;
1604 }
1605 }
1606
1607 /* silently ignore cpu mask on UP kernel */
1608 if (nr_cpu_ids > 1 && sc.cpu_mask[0] != 0) {
1609 err = __bitmap_parse(sc.cpu_mask, 32, 0,
1610 cpumask_bits(new_cpu_mask), nr_cpu_ids);
1611 if (err) {
1612 dev_warn(DEV, "__bitmap_parse() failed with %d\n", err);
1613 retcode = ERR_CPU_MASK_PARSE;
1614 goto fail;
1615 }
1616 }
1617
1618 ERR_IF (sc.rate < 1) sc.rate = 1;
1619 ERR_IF (sc.al_extents < 7) sc.al_extents = 127; /* arbitrary minimum */
1620#define AL_MAX ((MD_AL_MAX_SIZE-1) * AL_EXTENTS_PT)
1621 if (sc.al_extents > AL_MAX) {
1622 dev_err(DEV, "sc.al_extents > %d\n", AL_MAX);
1623 sc.al_extents = AL_MAX;
1624 }
1625#undef AL_MAX
1626
1627 /* most sanity checks done, try to assign the new sync-after
1628 * dependency. need to hold the global lock in there,
1629 * to avoid a race in the dependency loop check. */
1630 retcode = drbd_alter_sa(mdev, sc.after);
1631 if (retcode != NO_ERROR)
1632 goto fail;
1633
1634 /* ok, assign the rest of it as well.
1635 * lock against receive_SyncParam() */
1636 spin_lock(&mdev->peer_seq_lock);
1637 mdev->sync_conf = sc;
1638
1639 if (!rsr) {
1640 crypto_free_hash(mdev->csums_tfm);
1641 mdev->csums_tfm = csums_tfm;
1642 csums_tfm = NULL;
1643 }
1644
1645 if (!ovr) {
1646 crypto_free_hash(mdev->verify_tfm);
1647 mdev->verify_tfm = verify_tfm;
1648 verify_tfm = NULL;
1649 }
1650 spin_unlock(&mdev->peer_seq_lock);
1651
1652 if (get_ldev(mdev)) {
1653 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
1654 drbd_al_shrink(mdev);
1655 err = drbd_check_al_size(mdev);
1656 lc_unlock(mdev->act_log);
1657 wake_up(&mdev->al_wait);
1658
1659 put_ldev(mdev);
1660 drbd_md_sync(mdev);
1661
1662 if (err) {
1663 retcode = ERR_NOMEM;
1664 goto fail;
1665 }
1666 }
1667
1668 if (mdev->state.conn >= C_CONNECTED)
1669 drbd_send_sync_param(mdev, &sc);
1670
1671 if (!cpumask_equal(mdev->cpu_mask, new_cpu_mask)) {
1672 cpumask_copy(mdev->cpu_mask, new_cpu_mask);
1673 drbd_calc_cpu_mask(mdev);
1674 mdev->receiver.reset_cpu_mask = 1;
1675 mdev->asender.reset_cpu_mask = 1;
1676 mdev->worker.reset_cpu_mask = 1;
1677 }
1678
1679 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1680fail:
1681 free_cpumask_var(new_cpu_mask);
1682 crypto_free_hash(csums_tfm);
1683 crypto_free_hash(verify_tfm);
1684 reply->ret_code = retcode;
1685 return 0;
1686}
1687
1688static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1689 struct drbd_nl_cfg_reply *reply)
1690{
1691 int retcode;
1692
1693 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
1694
1695 if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
1696 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1697
1698 while (retcode == SS_NEED_CONNECTION) {
1699 spin_lock_irq(&mdev->req_lock);
1700 if (mdev->state.conn < C_CONNECTED)
1701 retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL);
1702 spin_unlock_irq(&mdev->req_lock);
1703
1704 if (retcode != SS_NEED_CONNECTION)
1705 break;
1706
1707 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1708 }
1709
1710 reply->ret_code = retcode;
1711 return 0;
1712}
1713
1714static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1715 struct drbd_nl_cfg_reply *reply)
1716{
1717
1718 reply->ret_code = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
1719
1720 return 0;
1721}
1722
1723static int drbd_nl_pause_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1724 struct drbd_nl_cfg_reply *reply)
1725{
1726 int retcode = NO_ERROR;
1727
1728 if (drbd_request_state(mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
1729 retcode = ERR_PAUSE_IS_SET;
1730
1731 reply->ret_code = retcode;
1732 return 0;
1733}
1734
1735static int drbd_nl_resume_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1736 struct drbd_nl_cfg_reply *reply)
1737{
1738 int retcode = NO_ERROR;
1739
1740 if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO)
1741 retcode = ERR_PAUSE_IS_CLEAR;
1742
1743 reply->ret_code = retcode;
1744 return 0;
1745}
1746
1747static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1748 struct drbd_nl_cfg_reply *reply)
1749{
1750 reply->ret_code = drbd_request_state(mdev, NS(susp, 1));
1751
1752 return 0;
1753}
1754
1755static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1756 struct drbd_nl_cfg_reply *reply)
1757{
1758 reply->ret_code = drbd_request_state(mdev, NS(susp, 0));
1759 return 0;
1760}
1761
1762static int drbd_nl_outdate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1763 struct drbd_nl_cfg_reply *reply)
1764{
1765 reply->ret_code = drbd_request_state(mdev, NS(disk, D_OUTDATED));
1766 return 0;
1767}
1768
1769static int drbd_nl_get_config(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1770 struct drbd_nl_cfg_reply *reply)
1771{
1772 unsigned short *tl;
1773
1774 tl = reply->tag_list;
1775
1776 if (get_ldev(mdev)) {
1777 tl = disk_conf_to_tags(mdev, &mdev->ldev->dc, tl);
1778 put_ldev(mdev);
1779 }
1780
1781 if (get_net_conf(mdev)) {
1782 tl = net_conf_to_tags(mdev, mdev->net_conf, tl);
1783 put_net_conf(mdev);
1784 }
1785 tl = syncer_conf_to_tags(mdev, &mdev->sync_conf, tl);
1786
1787 put_unaligned(TT_END, tl++); /* Close the tag list */
1788
1789 return (int)((char *)tl - (char *)reply->tag_list);
1790}
1791
1792static int drbd_nl_get_state(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1793 struct drbd_nl_cfg_reply *reply)
1794{
1795 unsigned short *tl = reply->tag_list;
1796 union drbd_state s = mdev->state;
1797 unsigned long rs_left;
1798 unsigned int res;
1799
1800 tl = get_state_to_tags(mdev, (struct get_state *)&s, tl);
1801
1802 /* no local ref, no bitmap, no syncer progress. */
1803 if (s.conn >= C_SYNC_SOURCE && s.conn <= C_PAUSED_SYNC_T) {
1804 if (get_ldev(mdev)) {
1805 drbd_get_syncer_progress(mdev, &rs_left, &res);
1806 tl = tl_add_int(tl, T_sync_progress, &res);
1807 put_ldev(mdev);
1808 }
1809 }
1810 put_unaligned(TT_END, tl++); /* Close the tag list */
1811
1812 return (int)((char *)tl - (char *)reply->tag_list);
1813}
1814
1815static int drbd_nl_get_uuids(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1816 struct drbd_nl_cfg_reply *reply)
1817{
1818 unsigned short *tl;
1819
1820 tl = reply->tag_list;
1821
1822 if (get_ldev(mdev)) {
1823 tl = tl_add_blob(tl, T_uuids, mdev->ldev->md.uuid, UI_SIZE*sizeof(u64));
1824 tl = tl_add_int(tl, T_uuids_flags, &mdev->ldev->md.flags);
1825 put_ldev(mdev);
1826 }
1827 put_unaligned(TT_END, tl++); /* Close the tag list */
1828
1829 return (int)((char *)tl - (char *)reply->tag_list);
1830}
1831
1832/**
1833 * drbd_nl_get_timeout_flag() - Used by drbdsetup to find out which timeout value to use
1834 * @mdev: DRBD device.
1835 * @nlp: Netlink/connector packet from drbdsetup
1836 * @reply: Reply packet for drbdsetup
1837 */
1838static int drbd_nl_get_timeout_flag(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1839 struct drbd_nl_cfg_reply *reply)
1840{
1841 unsigned short *tl;
1842 char rv;
1843
1844 tl = reply->tag_list;
1845
1846 rv = mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
1847 test_bit(USE_DEGR_WFC_T, &mdev->flags) ? UT_DEGRADED : UT_DEFAULT;
1848
1849 tl = tl_add_blob(tl, T_use_degraded, &rv, sizeof(rv));
1850 put_unaligned(TT_END, tl++); /* Close the tag list */
1851
1852 return (int)((char *)tl - (char *)reply->tag_list);
1853}
1854
1855static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1856 struct drbd_nl_cfg_reply *reply)
1857{
1858 /* default to resume from last known position, if possible */
1859 struct start_ov args =
1860 { .start_sector = mdev->ov_start_sector };
1861
1862 if (!start_ov_from_tags(mdev, nlp->tag_list, &args)) {
1863 reply->ret_code = ERR_MANDATORY_TAG;
1864 return 0;
1865 }
1866 /* w_make_ov_request expects position to be aligned */
1867 mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT;
1868 reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
1869 return 0;
1870}
1871
1872
1873static int drbd_nl_new_c_uuid(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1874 struct drbd_nl_cfg_reply *reply)
1875{
1876 int retcode = NO_ERROR;
1877 int skip_initial_sync = 0;
1878 int err;
1879
1880 struct new_c_uuid args;
1881
1882 memset(&args, 0, sizeof(struct new_c_uuid));
1883 if (!new_c_uuid_from_tags(mdev, nlp->tag_list, &args)) {
1884 reply->ret_code = ERR_MANDATORY_TAG;
1885 return 0;
1886 }
1887
1888 mutex_lock(&mdev->state_mutex); /* Protects us against serialized state changes. */
1889
1890 if (!get_ldev(mdev)) {
1891 retcode = ERR_NO_DISK;
1892 goto out;
1893 }
1894
1895 /* this is "skip initial sync", assume to be clean */
1896 if (mdev->state.conn == C_CONNECTED && mdev->agreed_pro_version >= 90 &&
1897 mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
1898 dev_info(DEV, "Preparing to skip initial sync\n");
1899 skip_initial_sync = 1;
1900 } else if (mdev->state.conn != C_STANDALONE) {
1901 retcode = ERR_CONNECTED;
1902 goto out_dec;
1903 }
1904
1905 drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
1906 drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
1907
1908 if (args.clear_bm) {
1909 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, "clear_n_write from new_c_uuid");
1910 if (err) {
1911 dev_err(DEV, "Writing bitmap failed with %d\n",err);
1912 retcode = ERR_IO_MD_DISK;
1913 }
1914 if (skip_initial_sync) {
1915 drbd_send_uuids_skip_initial_sync(mdev);
1916 _drbd_uuid_set(mdev, UI_BITMAP, 0);
1917 spin_lock_irq(&mdev->req_lock);
1918 _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
1919 CS_VERBOSE, NULL);
1920 spin_unlock_irq(&mdev->req_lock);
1921 }
1922 }
1923
1924 drbd_md_sync(mdev);
1925out_dec:
1926 put_ldev(mdev);
1927out:
1928 mutex_unlock(&mdev->state_mutex);
1929
1930 reply->ret_code = retcode;
1931 return 0;
1932}
1933
1934static struct drbd_conf *ensure_mdev(struct drbd_nl_cfg_req *nlp)
1935{
1936 struct drbd_conf *mdev;
1937
1938 if (nlp->drbd_minor >= minor_count)
1939 return NULL;
1940
1941 mdev = minor_to_mdev(nlp->drbd_minor);
1942
1943 if (!mdev && (nlp->flags & DRBD_NL_CREATE_DEVICE)) {
1944 struct gendisk *disk = NULL;
1945 mdev = drbd_new_device(nlp->drbd_minor);
1946
1947 spin_lock_irq(&drbd_pp_lock);
1948 if (minor_table[nlp->drbd_minor] == NULL) {
1949 minor_table[nlp->drbd_minor] = mdev;
1950 disk = mdev->vdisk;
1951 mdev = NULL;
1952 } /* else: we lost the race */
1953 spin_unlock_irq(&drbd_pp_lock);
1954
1955 if (disk) /* we won the race above */
1956 /* in case we ever add a drbd_delete_device(),
1957 * don't forget the del_gendisk! */
1958 add_disk(disk);
1959 else /* we lost the race above */
1960 drbd_free_mdev(mdev);
1961
1962 mdev = minor_to_mdev(nlp->drbd_minor);
1963 }
1964
1965 return mdev;
1966}
1967
1968struct cn_handler_struct {
1969 int (*function)(struct drbd_conf *,
1970 struct drbd_nl_cfg_req *,
1971 struct drbd_nl_cfg_reply *);
1972 int reply_body_size;
1973};
1974
1975static struct cn_handler_struct cnd_table[] = {
1976 [ P_primary ] = { &drbd_nl_primary, 0 },
1977 [ P_secondary ] = { &drbd_nl_secondary, 0 },
1978 [ P_disk_conf ] = { &drbd_nl_disk_conf, 0 },
1979 [ P_detach ] = { &drbd_nl_detach, 0 },
1980 [ P_net_conf ] = { &drbd_nl_net_conf, 0 },
1981 [ P_disconnect ] = { &drbd_nl_disconnect, 0 },
1982 [ P_resize ] = { &drbd_nl_resize, 0 },
1983 [ P_syncer_conf ] = { &drbd_nl_syncer_conf, 0 },
1984 [ P_invalidate ] = { &drbd_nl_invalidate, 0 },
1985 [ P_invalidate_peer ] = { &drbd_nl_invalidate_peer, 0 },
1986 [ P_pause_sync ] = { &drbd_nl_pause_sync, 0 },
1987 [ P_resume_sync ] = { &drbd_nl_resume_sync, 0 },
1988 [ P_suspend_io ] = { &drbd_nl_suspend_io, 0 },
1989 [ P_resume_io ] = { &drbd_nl_resume_io, 0 },
1990 [ P_outdate ] = { &drbd_nl_outdate, 0 },
1991 [ P_get_config ] = { &drbd_nl_get_config,
1992 sizeof(struct syncer_conf_tag_len_struct) +
1993 sizeof(struct disk_conf_tag_len_struct) +
1994 sizeof(struct net_conf_tag_len_struct) },
1995 [ P_get_state ] = { &drbd_nl_get_state,
1996 sizeof(struct get_state_tag_len_struct) +
1997 sizeof(struct sync_progress_tag_len_struct) },
1998 [ P_get_uuids ] = { &drbd_nl_get_uuids,
1999 sizeof(struct get_uuids_tag_len_struct) },
2000 [ P_get_timeout_flag ] = { &drbd_nl_get_timeout_flag,
2001 sizeof(struct get_timeout_flag_tag_len_struct)},
2002 [ P_start_ov ] = { &drbd_nl_start_ov, 0 },
2003 [ P_new_c_uuid ] = { &drbd_nl_new_c_uuid, 0 },
2004};
2005
9f5180e5 2006static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp)
b411b363
PR		 2007{
2008 struct drbd_nl_cfg_req *nlp = (struct drbd_nl_cfg_req *)req->data;
2009 struct cn_handler_struct *cm;
2010 struct cn_msg *cn_reply;
2011 struct drbd_nl_cfg_reply *reply;
2012 struct drbd_conf *mdev;
2013 int retcode, rr;
2014 int reply_size = sizeof(struct cn_msg)
2015 + sizeof(struct drbd_nl_cfg_reply)
2016 + sizeof(short int);
2017
2018 if (!try_module_get(THIS_MODULE)) {
2019 printk(KERN_ERR "drbd: try_module_get() failed!\n");
2020 return;
2021 }
2022
9f5180e5
PR		 2023 if (!cap_raised(nsp->eff_cap, CAP_SYS_ADMIN)) {
2024 retcode = ERR_PERM;
2025 goto fail;
2026 }
2027
b411b363
PR		 2028 mdev = ensure_mdev(nlp);
2029 if (!mdev) {
2030 retcode = ERR_MINOR_INVALID;
2031 goto fail;
2032 }
2033
b411b363
PR		 2034 if (nlp->packet_type >= P_nl_after_last_packet) {
2035 retcode = ERR_PACKET_NR;
2036 goto fail;
2037 }
2038
2039 cm = cnd_table + nlp->packet_type;
2040
2041 /* This may happen if packet number is 0: */
2042 if (cm->function == NULL) {
2043 retcode = ERR_PACKET_NR;
2044 goto fail;
2045 }
2046
2047 reply_size += cm->reply_body_size;
2048
2049 /* allocation not in the IO path, cqueue thread context */
2050 cn_reply = kmalloc(reply_size, GFP_KERNEL);
2051 if (!cn_reply) {
2052 retcode = ERR_NOMEM;
2053 goto fail;
2054 }
2055 reply = (struct drbd_nl_cfg_reply *) cn_reply->data;
2056
2057 reply->packet_type =
2058 cm->reply_body_size ? nlp->packet_type : P_nl_after_last_packet;
2059 reply->minor = nlp->drbd_minor;
2060 reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */
2061 /* reply->tag_list; might be modified by cm->function. */
2062
2063 rr = cm->function(mdev, nlp, reply);
2064
2065 cn_reply->id = req->id;
2066 cn_reply->seq = req->seq;
2067 cn_reply->ack = req->ack + 1;
2068 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + rr;
2069 cn_reply->flags = 0;
2070
b411b363
PR		 2071 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL);
2072 if (rr && rr != -ESRCH)
2073 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2074
2075 kfree(cn_reply);
2076 module_put(THIS_MODULE);
2077 return;
2078 fail:
2079 drbd_nl_send_reply(req, retcode);
2080 module_put(THIS_MODULE);
2081}
2082
2083static atomic_t drbd_nl_seq = ATOMIC_INIT(2); /* two. */
2084
2085static unsigned short *
2086__tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data,
2087 unsigned short len, int nul_terminated)
2088{
2089 unsigned short l = tag_descriptions[tag_number(tag)].max_len;
2090 len = (len < l) ? len : l;
2091 put_unaligned(tag, tl++);
2092 put_unaligned(len, tl++);
2093 memcpy(tl, data, len);
2094 tl = (unsigned short*)((char*)tl + len);
2095 if (nul_terminated)
2096 *((char*)tl - 1) = 0;
2097 return tl;
2098}
2099
2100static unsigned short *
2101tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, int len)
2102{
2103 return __tl_add_blob(tl, tag, data, len, 0);
2104}
2105
2106static unsigned short *
2107tl_add_str(unsigned short *tl, enum drbd_tags tag, const char *str)
2108{
2109 return __tl_add_blob(tl, tag, str, strlen(str)+1, 0);
2110}
2111
2112static unsigned short *
2113tl_add_int(unsigned short *tl, enum drbd_tags tag, const void *val)
2114{
2115 put_unaligned(tag, tl++);
2116 switch(tag_type(tag)) {
2117 case TT_INTEGER:
2118 put_unaligned(sizeof(int), tl++);
2119 put_unaligned(*(int *)val, (int *)tl);
2120 tl = (unsigned short*)((char*)tl+sizeof(int));
2121 break;
2122 case TT_INT64:
2123 put_unaligned(sizeof(u64), tl++);
2124 put_unaligned(*(u64 *)val, (u64 *)tl);
2125 tl = (unsigned short*)((char*)tl+sizeof(u64));
2126 break;
2127 default:
2128 /* someone did something stupid. */
2129 ;
2130 }
2131 return tl;
2132}
2133
2134void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state state)
2135{
2136 char buffer[sizeof(struct cn_msg)+
2137 sizeof(struct drbd_nl_cfg_reply)+
2138 sizeof(struct get_state_tag_len_struct)+
2139 sizeof(short int)];
2140 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2141 struct drbd_nl_cfg_reply *reply =
2142 (struct drbd_nl_cfg_reply *)cn_reply->data;
2143 unsigned short *tl = reply->tag_list;
2144
2145 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2146
2147 tl = get_state_to_tags(mdev, (struct get_state *)&state, tl);
2148
2149 put_unaligned(TT_END, tl++); /* Close the tag list */
2150
2151 cn_reply->id.idx = CN_IDX_DRBD;
2152 cn_reply->id.val = CN_VAL_DRBD;
2153
2154 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2155 cn_reply->ack = 0; /* not used here. */
2156 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2157 (int)((char *)tl - (char *)reply->tag_list);
2158 cn_reply->flags = 0;
2159
2160 reply->packet_type = P_get_state;
2161 reply->minor = mdev_to_minor(mdev);
2162 reply->ret_code = NO_ERROR;
2163
b411b363
PR		 2164 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2165}
2166
2167void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name)
2168{
2169 char buffer[sizeof(struct cn_msg)+
2170 sizeof(struct drbd_nl_cfg_reply)+
2171 sizeof(struct call_helper_tag_len_struct)+
2172 sizeof(short int)];
2173 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2174 struct drbd_nl_cfg_reply *reply =
2175 (struct drbd_nl_cfg_reply *)cn_reply->data;
2176 unsigned short *tl = reply->tag_list;
2177
2178 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2179
2180 tl = tl_add_str(tl, T_helper, helper_name);
2181 put_unaligned(TT_END, tl++); /* Close the tag list */
2182
2183 cn_reply->id.idx = CN_IDX_DRBD;
2184 cn_reply->id.val = CN_VAL_DRBD;
2185
2186 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2187 cn_reply->ack = 0; /* not used here. */
2188 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2189 (int)((char *)tl - (char *)reply->tag_list);
2190 cn_reply->flags = 0;
2191
2192 reply->packet_type = P_call_helper;
2193 reply->minor = mdev_to_minor(mdev);
2194 reply->ret_code = NO_ERROR;
2195
b411b363
PR		 2196 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2197}
2198
2199void drbd_bcast_ee(struct drbd_conf *mdev,
2200 const char *reason, const int dgs,
2201 const char* seen_hash, const char* calc_hash,
2202 const struct drbd_epoch_entry* e)
2203{
2204 struct cn_msg *cn_reply;
2205 struct drbd_nl_cfg_reply *reply;
2206 struct bio_vec *bvec;
2207 unsigned short *tl;
2208 int i;
2209
2210 if (!e)
2211 return;
2212 if (!reason || !reason[0])
2213 return;
2214
2215 /* apparently we have to memcpy twice, first to prepare the data for the
2216 * struct cn_msg, then within cn_netlink_send from the cn_msg to the
2217 * netlink skb. */
2218 /* receiver thread context, which is not in the writeout path (of this node),
2219 * but may be in the writeout path of the _other_ node.
2220 * GFP_NOIO to avoid potential "distributed deadlock". */
2221 cn_reply = kmalloc(
2222 sizeof(struct cn_msg)+
2223 sizeof(struct drbd_nl_cfg_reply)+
2224 sizeof(struct dump_ee_tag_len_struct)+
2225 sizeof(short int),
2226 GFP_NOIO);
2227
2228 if (!cn_reply) {
2229 dev_err(DEV, "could not kmalloc buffer for drbd_bcast_ee, sector %llu, size %u\n",
2230 (unsigned long long)e->sector, e->size);
2231 return;
2232 }
2233
2234 reply = (struct drbd_nl_cfg_reply*)cn_reply->data;
2235 tl = reply->tag_list;
2236
2237 tl = tl_add_str(tl, T_dump_ee_reason, reason);
2238 tl = tl_add_blob(tl, T_seen_digest, seen_hash, dgs);
2239 tl = tl_add_blob(tl, T_calc_digest, calc_hash, dgs);
2240 tl = tl_add_int(tl, T_ee_sector, &e->sector);
2241 tl = tl_add_int(tl, T_ee_block_id, &e->block_id);
2242
2243 put_unaligned(T_ee_data, tl++);
2244 put_unaligned(e->size, tl++);
2245
2246 __bio_for_each_segment(bvec, e->private_bio, i, 0) {
2247 void *d = kmap(bvec->bv_page);
2248 memcpy(tl, d + bvec->bv_offset, bvec->bv_len);
2249 kunmap(bvec->bv_page);
2250 tl=(unsigned short*)((char*)tl + bvec->bv_len);
2251 }
2252 put_unaligned(TT_END, tl++); /* Close the tag list */
2253
2254 cn_reply->id.idx = CN_IDX_DRBD;
2255 cn_reply->id.val = CN_VAL_DRBD;
2256
2257 cn_reply->seq = atomic_add_return(1,&drbd_nl_seq);
2258 cn_reply->ack = 0; // not used here.
2259 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2260 (int)((char*)tl - (char*)reply->tag_list);
2261 cn_reply->flags = 0;
2262
2263 reply->packet_type = P_dump_ee;
2264 reply->minor = mdev_to_minor(mdev);
2265 reply->ret_code = NO_ERROR;
2266
b411b363
PR		 2267 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2268 kfree(cn_reply);
2269}
2270
2271void drbd_bcast_sync_progress(struct drbd_conf *mdev)
2272{
2273 char buffer[sizeof(struct cn_msg)+
2274 sizeof(struct drbd_nl_cfg_reply)+
2275 sizeof(struct sync_progress_tag_len_struct)+
2276 sizeof(short int)];
2277 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2278 struct drbd_nl_cfg_reply *reply =
2279 (struct drbd_nl_cfg_reply *)cn_reply->data;
2280 unsigned short *tl = reply->tag_list;
2281 unsigned long rs_left;
2282 unsigned int res;
2283
2284 /* no local ref, no bitmap, no syncer progress, no broadcast. */
2285 if (!get_ldev(mdev))
2286 return;
2287 drbd_get_syncer_progress(mdev, &rs_left, &res);
2288 put_ldev(mdev);
2289
2290 tl = tl_add_int(tl, T_sync_progress, &res);
2291 put_unaligned(TT_END, tl++); /* Close the tag list */
2292
2293 cn_reply->id.idx = CN_IDX_DRBD;
2294 cn_reply->id.val = CN_VAL_DRBD;
2295
2296 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2297 cn_reply->ack = 0; /* not used here. */
2298 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2299 (int)((char *)tl - (char *)reply->tag_list);
2300 cn_reply->flags = 0;
2301
2302 reply->packet_type = P_sync_progress;
2303 reply->minor = mdev_to_minor(mdev);
2304 reply->ret_code = NO_ERROR;
2305
b411b363
PR		 2306 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2307}
2308
2309int __init drbd_nl_init(void)
2310{
2311 static struct cb_id cn_id_drbd;
2312 int err, try=10;
2313
2314 cn_id_drbd.val = CN_VAL_DRBD;
2315 do {
2316 cn_id_drbd.idx = cn_idx;
2317 err = cn_add_callback(&cn_id_drbd, "cn_drbd", &drbd_connector_callback);
2318 if (!err)
2319 break;
2320 cn_idx = (cn_idx + CN_IDX_STEP);
2321 } while (try--);
2322
2323 if (err) {
2324 printk(KERN_ERR "drbd: cn_drbd failed to register\n");
2325 return err;
2326 }
2327
2328 return 0;
2329}
2330
2331void drbd_nl_cleanup(void)
2332{
2333 static struct cb_id cn_id_drbd;
2334
2335 cn_id_drbd.idx = cn_idx;
2336 cn_id_drbd.val = CN_VAL_DRBD;
2337
2338 cn_del_callback(&cn_id_drbd);
2339}
2340
2341void drbd_nl_send_reply(struct cn_msg *req, int ret_code)
2342{
2343 char buffer[sizeof(struct cn_msg)+sizeof(struct drbd_nl_cfg_reply)];
2344 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2345 struct drbd_nl_cfg_reply *reply =
2346 (struct drbd_nl_cfg_reply *)cn_reply->data;
2347 int rr;
2348
2349 cn_reply->id = req->id;
2350
2351 cn_reply->seq = req->seq;
2352 cn_reply->ack = req->ack + 1;
2353 cn_reply->len = sizeof(struct drbd_nl_cfg_reply);
2354 cn_reply->flags = 0;
2355
2356 reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor;
2357 reply->ret_code = ret_code;
2358
b411b363
PR		 2359 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2360 if (rr && rr != -ESRCH)
2361 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2362}
2363
Clone of davem's net-next-2.6 tree