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drbd: Finished the "on-no-data-accessible suspend-io;" functionality
[deliverable/linux.git] / drivers / block / drbd / drbd_nl.c
CommitLineData
b411b363
PR		 1/*
2 drbd_nl.c
3
4 This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
5
6 Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
7 Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
8 Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
9
10 drbd is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2, or (at your option)
13 any later version.
14
15 drbd is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with drbd; see the file COPYING. If not, write to
22 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
23
24 */
25
b411b363
PR		 26#include <linux/module.h>
27#include <linux/drbd.h>
28#include <linux/in.h>
29#include <linux/fs.h>
30#include <linux/file.h>
31#include <linux/slab.h>
32#include <linux/connector.h>
33#include <linux/blkpg.h>
34#include <linux/cpumask.h>
35#include "drbd_int.h"
265be2d0 36#include "drbd_req.h"
b411b363
PR		 37#include "drbd_wrappers.h"
38#include <asm/unaligned.h>
39#include <linux/drbd_tag_magic.h>
40#include <linux/drbd_limits.h>
41
42static unsigned short *tl_add_blob(unsigned short *, enum drbd_tags, const void *, int);
43static unsigned short *tl_add_str(unsigned short *, enum drbd_tags, const char *);
44static unsigned short *tl_add_int(unsigned short *, enum drbd_tags, const void *);
45
46/* see get_sb_bdev and bd_claim */
47static char *drbd_m_holder = "Hands off! this is DRBD's meta data device.";
48
49/* Generate the tag_list to struct functions */
50#define NL_PACKET(name, number, fields) \
51static int name ## _from_tags(struct drbd_conf *mdev, \
52 unsigned short *tags, struct name *arg) __attribute__ ((unused)); \
53static int name ## _from_tags(struct drbd_conf *mdev, \
54 unsigned short *tags, struct name *arg) \
55{ \
56 int tag; \
57 int dlen; \
58 \
59 while ((tag = get_unaligned(tags++)) != TT_END) { \
60 dlen = get_unaligned(tags++); \
61 switch (tag_number(tag)) { \
62 fields \
63 default: \
64 if (tag & T_MANDATORY) { \
65 dev_err(DEV, "Unknown tag: %d\n", tag_number(tag)); \
66 return 0; \
67 } \
68 } \
69 tags = (unsigned short *)((char *)tags + dlen); \
70 } \
71 return 1; \
72}
73#define NL_INTEGER(pn, pr, member) \
74 case pn: /* D_ASSERT( tag_type(tag) == TT_INTEGER ); */ \
75 arg->member = get_unaligned((int *)(tags)); \
76 break;
77#define NL_INT64(pn, pr, member) \
78 case pn: /* D_ASSERT( tag_type(tag) == TT_INT64 ); */ \
79 arg->member = get_unaligned((u64 *)(tags)); \
80 break;
81#define NL_BIT(pn, pr, member) \
82 case pn: /* D_ASSERT( tag_type(tag) == TT_BIT ); */ \
83 arg->member = *(char *)(tags) ? 1 : 0; \
84 break;
85#define NL_STRING(pn, pr, member, len) \
86 case pn: /* D_ASSERT( tag_type(tag) == TT_STRING ); */ \
87 if (dlen > len) { \
88 dev_err(DEV, "arg too long: %s (%u wanted, max len: %u bytes)\n", \
89 #member, dlen, (unsigned int)len); \
90 return 0; \
91 } \
92 arg->member ## _len = dlen; \
93 memcpy(arg->member, tags, min_t(size_t, dlen, len)); \
94 break;
95#include "linux/drbd_nl.h"
96
97/* Generate the struct to tag_list functions */
98#define NL_PACKET(name, number, fields) \
99static unsigned short* \
100name ## _to_tags(struct drbd_conf *mdev, \
101 struct name *arg, unsigned short *tags) __attribute__ ((unused)); \
102static unsigned short* \
103name ## _to_tags(struct drbd_conf *mdev, \
104 struct name *arg, unsigned short *tags) \
105{ \
106 fields \
107 return tags; \
108}
109
110#define NL_INTEGER(pn, pr, member) \
111 put_unaligned(pn | pr | TT_INTEGER, tags++); \
112 put_unaligned(sizeof(int), tags++); \
113 put_unaligned(arg->member, (int *)tags); \
114 tags = (unsigned short *)((char *)tags+sizeof(int));
115#define NL_INT64(pn, pr, member) \
116 put_unaligned(pn | pr | TT_INT64, tags++); \
117 put_unaligned(sizeof(u64), tags++); \
118 put_unaligned(arg->member, (u64 *)tags); \
119 tags = (unsigned short *)((char *)tags+sizeof(u64));
120#define NL_BIT(pn, pr, member) \
121 put_unaligned(pn | pr | TT_BIT, tags++); \
122 put_unaligned(sizeof(char), tags++); \
123 *(char *)tags = arg->member; \
124 tags = (unsigned short *)((char *)tags+sizeof(char));
125#define NL_STRING(pn, pr, member, len) \
126 put_unaligned(pn | pr | TT_STRING, tags++); \
127 put_unaligned(arg->member ## _len, tags++); \
128 memcpy(tags, arg->member, arg->member ## _len); \
129 tags = (unsigned short *)((char *)tags + arg->member ## _len);
130#include "linux/drbd_nl.h"
131
132void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name);
133void drbd_nl_send_reply(struct cn_msg *, int);
134
135int drbd_khelper(struct drbd_conf *mdev, char *cmd)
136{
137 char *envp[] = { "HOME=/",
138 "TERM=linux",
139 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
140 NULL, /* Will be set to address family */
141 NULL, /* Will be set to address */
142 NULL };
143
144 char mb[12], af[20], ad[60], *afs;
145 char *argv[] = {usermode_helper, cmd, mb, NULL };
146 int ret;
147
148 snprintf(mb, 12, "minor-%d", mdev_to_minor(mdev));
149
150 if (get_net_conf(mdev)) {
151 switch (((struct sockaddr *)mdev->net_conf->peer_addr)->sa_family) {
152 case AF_INET6:
153 afs = "ipv6";
154 snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI6",
155 &((struct sockaddr_in6 *)mdev->net_conf->peer_addr)->sin6_addr);
156 break;
157 case AF_INET:
158 afs = "ipv4";
159 snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4",
160 &((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr);
161 break;
162 default:
163 afs = "ssocks";
164 snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4",
165 &((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr);
166 }
167 snprintf(af, 20, "DRBD_PEER_AF=%s", afs);
168 envp[3]=af;
169 envp[4]=ad;
170 put_net_conf(mdev);
171 }
172
173 dev_info(DEV, "helper command: %s %s %s\n", usermode_helper, cmd, mb);
174
175 drbd_bcast_ev_helper(mdev, cmd);
176 ret = call_usermodehelper(usermode_helper, argv, envp, 1);
177 if (ret)
178 dev_warn(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
179 usermode_helper, cmd, mb,
180 (ret >> 8) & 0xff, ret);
181 else
182 dev_info(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
183 usermode_helper, cmd, mb,
184 (ret >> 8) & 0xff, ret);
185
186 if (ret < 0) /* Ignore any ERRNOs we got. */
187 ret = 0;
188
189 return ret;
190}
191
192enum drbd_disk_state drbd_try_outdate_peer(struct drbd_conf *mdev)
193{
194 char *ex_to_string;
195 int r;
196 enum drbd_disk_state nps;
197 enum drbd_fencing_p fp;
198
199 D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
200
201 if (get_ldev_if_state(mdev, D_CONSISTENT)) {
202 fp = mdev->ldev->dc.fencing;
203 put_ldev(mdev);
204 } else {
205 dev_warn(DEV, "Not fencing peer, I'm not even Consistent myself.\n");
206 return mdev->state.pdsk;
207 }
208
209 if (fp == FP_STONITH)
210 _drbd_request_state(mdev, NS(susp, 1), CS_WAIT_COMPLETE);
211
212 r = drbd_khelper(mdev, "fence-peer");
213
214 switch ((r>>8) & 0xff) {
215 case 3: /* peer is inconsistent */
216 ex_to_string = "peer is inconsistent or worse";
217 nps = D_INCONSISTENT;
218 break;
219 case 4: /* peer got outdated, or was already outdated */
220 ex_to_string = "peer was fenced";
221 nps = D_OUTDATED;
222 break;
223 case 5: /* peer was down */
224 if (mdev->state.disk == D_UP_TO_DATE) {
225 /* we will(have) create(d) a new UUID anyways... */
226 ex_to_string = "peer is unreachable, assumed to be dead";
227 nps = D_OUTDATED;
228 } else {
229 ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
230 nps = mdev->state.pdsk;
231 }
232 break;
233 case 6: /* Peer is primary, voluntarily outdate myself.
234 * This is useful when an unconnected R_SECONDARY is asked to
235 * become R_PRIMARY, but finds the other peer being active. */
236 ex_to_string = "peer is active";
237 dev_warn(DEV, "Peer is primary, outdating myself.\n");
238 nps = D_UNKNOWN;
239 _drbd_request_state(mdev, NS(disk, D_OUTDATED), CS_WAIT_COMPLETE);
240 break;
241 case 7:
242 if (fp != FP_STONITH)
243 dev_err(DEV, "fence-peer() = 7 && fencing != Stonith !!!\n");
244 ex_to_string = "peer was stonithed";
245 nps = D_OUTDATED;
246 break;
247 default:
248 /* The script is broken ... */
249 nps = D_UNKNOWN;
250 dev_err(DEV, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
251 return nps;
252 }
253
254 dev_info(DEV, "fence-peer helper returned %d (%s)\n",
255 (r>>8) & 0xff, ex_to_string);
256 return nps;
257}
258
259
260int drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
261{
262 const int max_tries = 4;
263 int r = 0;
264 int try = 0;
265 int forced = 0;
266 union drbd_state mask, val;
267 enum drbd_disk_state nps;
268
269 if (new_role == R_PRIMARY)
270 request_ping(mdev); /* Detect a dead peer ASAP */
271
272 mutex_lock(&mdev->state_mutex);
273
274 mask.i = 0; mask.role = R_MASK;
275 val.i = 0; val.role = new_role;
276
277 while (try++ < max_tries) {
278 r = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE);
279
280 /* in case we first succeeded to outdate,
281 * but now suddenly could establish a connection */
282 if (r == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
283 val.pdsk = 0;
284 mask.pdsk = 0;
285 continue;
286 }
287
288 if (r == SS_NO_UP_TO_DATE_DISK && force &&
d10a33c6
PR		 289 (mdev->state.disk < D_UP_TO_DATE &&
290 mdev->state.disk >= D_INCONSISTENT)) {
b411b363
PR		 291 mask.disk = D_MASK;
292 val.disk = D_UP_TO_DATE;
293 forced = 1;
294 continue;
295 }
296
297 if (r == SS_NO_UP_TO_DATE_DISK &&
298 mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) {
299 D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
300 nps = drbd_try_outdate_peer(mdev);
301
302 if (nps == D_OUTDATED || nps == D_INCONSISTENT) {
303 val.disk = D_UP_TO_DATE;
304 mask.disk = D_MASK;
305 }
306
307 val.pdsk = nps;
308 mask.pdsk = D_MASK;
309
310 continue;
311 }
312
313 if (r == SS_NOTHING_TO_DO)
314 goto fail;
315 if (r == SS_PRIMARY_NOP && mask.pdsk == 0) {
316 nps = drbd_try_outdate_peer(mdev);
317
318 if (force && nps > D_OUTDATED) {
319 dev_warn(DEV, "Forced into split brain situation!\n");
320 nps = D_OUTDATED;
321 }
322
323 mask.pdsk = D_MASK;
324 val.pdsk = nps;
325
326 continue;
327 }
328 if (r == SS_TWO_PRIMARIES) {
329 /* Maybe the peer is detected as dead very soon...
330 retry at most once more in this case. */
331 __set_current_state(TASK_INTERRUPTIBLE);
332 schedule_timeout((mdev->net_conf->ping_timeo+1)*HZ/10);
333 if (try < max_tries)
334 try = max_tries - 1;
335 continue;
336 }
337 if (r < SS_SUCCESS) {
338 r = _drbd_request_state(mdev, mask, val,
339 CS_VERBOSE + CS_WAIT_COMPLETE);
340 if (r < SS_SUCCESS)
341 goto fail;
342 }
343 break;
344 }
345
346 if (r < SS_SUCCESS)
347 goto fail;
348
349 if (forced)
350 dev_warn(DEV, "Forced to consider local data as UpToDate!\n");
351
352 /* Wait until nothing is on the fly :) */
353 wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0);
354
355 if (new_role == R_SECONDARY) {
356 set_disk_ro(mdev->vdisk, TRUE);
357 if (get_ldev(mdev)) {
358 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
359 put_ldev(mdev);
360 }
361 } else {
362 if (get_net_conf(mdev)) {
363 mdev->net_conf->want_lose = 0;
364 put_net_conf(mdev);
365 }
366 set_disk_ro(mdev->vdisk, FALSE);
367 if (get_ldev(mdev)) {
368 if (((mdev->state.conn < C_CONNECTED ||
369 mdev->state.pdsk <= D_FAILED)
370 && mdev->ldev->md.uuid[UI_BITMAP] == 0) || forced)
371 drbd_uuid_new_current(mdev);
372
373 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
374 put_ldev(mdev);
375 }
376 }
377
378 if ((new_role == R_SECONDARY) && get_ldev(mdev)) {
379 drbd_al_to_on_disk_bm(mdev);
380 put_ldev(mdev);
381 }
382
383 if (mdev->state.conn >= C_WF_REPORT_PARAMS) {
384 /* if this was forced, we should consider sync */
385 if (forced)
386 drbd_send_uuids(mdev);
387 drbd_send_state(mdev);
388 }
389
390 drbd_md_sync(mdev);
391
392 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
393 fail:
394 mutex_unlock(&mdev->state_mutex);
395 return r;
396}
397
398
399static int drbd_nl_primary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
400 struct drbd_nl_cfg_reply *reply)
401{
402 struct primary primary_args;
403
404 memset(&primary_args, 0, sizeof(struct primary));
405 if (!primary_from_tags(mdev, nlp->tag_list, &primary_args)) {
406 reply->ret_code = ERR_MANDATORY_TAG;
407 return 0;
408 }
409
410 reply->ret_code =
1f552430 411 drbd_set_role(mdev, R_PRIMARY, primary_args.primary_force);
b411b363
PR		 412
413 return 0;
414}
415
416static int drbd_nl_secondary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
417 struct drbd_nl_cfg_reply *reply)
418{
419 reply->ret_code = drbd_set_role(mdev, R_SECONDARY, 0);
420
421 return 0;
422}
423
424/* initializes the md.*_offset members, so we are able to find
425 * the on disk meta data */
426static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
427 struct drbd_backing_dev *bdev)
428{
429 sector_t md_size_sect = 0;
430 switch (bdev->dc.meta_dev_idx) {
431 default:
432 /* v07 style fixed size indexed meta data */
433 bdev->md.md_size_sect = MD_RESERVED_SECT;
434 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
435 bdev->md.al_offset = MD_AL_OFFSET;
436 bdev->md.bm_offset = MD_BM_OFFSET;
437 break;
438 case DRBD_MD_INDEX_FLEX_EXT:
439 /* just occupy the full device; unit: sectors */
440 bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
441 bdev->md.md_offset = 0;
442 bdev->md.al_offset = MD_AL_OFFSET;
443 bdev->md.bm_offset = MD_BM_OFFSET;
444 break;
445 case DRBD_MD_INDEX_INTERNAL:
446 case DRBD_MD_INDEX_FLEX_INT:
447 bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
448 /* al size is still fixed */
449 bdev->md.al_offset = -MD_AL_MAX_SIZE;
450 /* we need (slightly less than) ~ this much bitmap sectors: */
451 md_size_sect = drbd_get_capacity(bdev->backing_bdev);
452 md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
453 md_size_sect = BM_SECT_TO_EXT(md_size_sect);
454 md_size_sect = ALIGN(md_size_sect, 8);
455
456 /* plus the "drbd meta data super block",
457 * and the activity log; */
458 md_size_sect += MD_BM_OFFSET;
459
460 bdev->md.md_size_sect = md_size_sect;
461 /* bitmap offset is adjusted by 'super' block size */
462 bdev->md.bm_offset = -md_size_sect + MD_AL_OFFSET;
463 break;
464 }
465}
466
467char *ppsize(char *buf, unsigned long long size)
468{
469 /* Needs 9 bytes at max. */
470 static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
471 int base = 0;
472 while (size >= 10000) {
473 /* shift + round */
474 size = (size >> 10) + !!(size & (1<<9));
475 base++;
476 }
477 sprintf(buf, "%lu %cB", (long)size, units[base]);
478
479 return buf;
480}
481
482/* there is still a theoretical deadlock when called from receiver
483 * on an D_INCONSISTENT R_PRIMARY:
484 * remote READ does inc_ap_bio, receiver would need to receive answer
485 * packet from remote to dec_ap_bio again.
486 * receiver receive_sizes(), comes here,
487 * waits for ap_bio_cnt == 0. -> deadlock.
488 * but this cannot happen, actually, because:
489 * R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable
490 * (not connected, or bad/no disk on peer):
491 * see drbd_fail_request_early, ap_bio_cnt is zero.
492 * R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET:
493 * peer may not initiate a resize.
494 */
495void drbd_suspend_io(struct drbd_conf *mdev)
496{
497 set_bit(SUSPEND_IO, &mdev->flags);
265be2d0
PR		 498 if (mdev->state.susp)
499 return;
b411b363
PR		 500 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
501}
502
503void drbd_resume_io(struct drbd_conf *mdev)
504{
505 clear_bit(SUSPEND_IO, &mdev->flags);
506 wake_up(&mdev->misc_wait);
507}
508
509/**
510 * drbd_determine_dev_size() - Sets the right device size obeying all constraints
511 * @mdev: DRBD device.
512 *
513 * Returns 0 on success, negative return values indicate errors.
514 * You should call drbd_md_sync() after calling this function.
515 */
d845030f 516enum determine_dev_size drbd_determin_dev_size(struct drbd_conf *mdev, enum dds_flags flags) __must_hold(local)
b411b363
PR		 517{
518 sector_t prev_first_sect, prev_size; /* previous meta location */
519 sector_t la_size;
520 sector_t size;
521 char ppb[10];
522
523 int md_moved, la_size_changed;
524 enum determine_dev_size rv = unchanged;
525
526 /* race:
527 * application request passes inc_ap_bio,
528 * but then cannot get an AL-reference.
529 * this function later may wait on ap_bio_cnt == 0. -> deadlock.
530 *
531 * to avoid that:
532 * Suspend IO right here.
533 * still lock the act_log to not trigger ASSERTs there.
534 */
535 drbd_suspend_io(mdev);
536
537 /* no wait necessary anymore, actually we could assert that */
538 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
539
540 prev_first_sect = drbd_md_first_sector(mdev->ldev);
541 prev_size = mdev->ldev->md.md_size_sect;
542 la_size = mdev->ldev->md.la_size_sect;
543
544 /* TODO: should only be some assert here, not (re)init... */
545 drbd_md_set_sector_offsets(mdev, mdev->ldev);
546
d845030f 547 size = drbd_new_dev_size(mdev, mdev->ldev, flags & DDSF_FORCED);
b411b363
PR		 548
549 if (drbd_get_capacity(mdev->this_bdev) != size ||
550 drbd_bm_capacity(mdev) != size) {
551 int err;
02d9a94b 552 err = drbd_bm_resize(mdev, size, !(flags & DDSF_NO_RESYNC));
b411b363
PR		 553 if (unlikely(err)) {
554 /* currently there is only one error: ENOMEM! */
555 size = drbd_bm_capacity(mdev)>>1;
556 if (size == 0) {
557 dev_err(DEV, "OUT OF MEMORY! "
558 "Could not allocate bitmap!\n");
559 } else {
560 dev_err(DEV, "BM resizing failed. "
561 "Leaving size unchanged at size = %lu KB\n",
562 (unsigned long)size);
563 }
564 rv = dev_size_error;
565 }
566 /* racy, see comments above. */
567 drbd_set_my_capacity(mdev, size);
568 mdev->ldev->md.la_size_sect = size;
569 dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1),
570 (unsigned long long)size>>1);
571 }
572 if (rv == dev_size_error)
573 goto out;
574
575 la_size_changed = (la_size != mdev->ldev->md.la_size_sect);
576
577 md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev)
578 || prev_size != mdev->ldev->md.md_size_sect;
579
580 if (la_size_changed || md_moved) {
581 drbd_al_shrink(mdev); /* All extents inactive. */
582 dev_info(DEV, "Writing the whole bitmap, %s\n",
583 la_size_changed && md_moved ? "size changed and md moved" :
584 la_size_changed ? "size changed" : "md moved");
585 rv = drbd_bitmap_io(mdev, &drbd_bm_write, "size changed"); /* does drbd_resume_io() ! */
586 drbd_md_mark_dirty(mdev);
587 }
588
589 if (size > la_size)
590 rv = grew;
591 if (size < la_size)
592 rv = shrunk;
593out:
594 lc_unlock(mdev->act_log);
595 wake_up(&mdev->al_wait);
596 drbd_resume_io(mdev);
597
598 return rv;
599}
600
601sector_t
a393db6f 602drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev, int assume_peer_has_space)
b411b363
PR		 603{
604 sector_t p_size = mdev->p_size; /* partner's disk size. */
605 sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */
606 sector_t m_size; /* my size */
607 sector_t u_size = bdev->dc.disk_size; /* size requested by user. */
608 sector_t size = 0;
609
610 m_size = drbd_get_max_capacity(bdev);
611
a393db6f
PR		 612 if (mdev->state.conn < C_CONNECTED && assume_peer_has_space) {
613 dev_warn(DEV, "Resize while not connected was forced by the user!\n");
614 p_size = m_size;
615 }
616
b411b363
PR		 617 if (p_size && m_size) {
618 size = min_t(sector_t, p_size, m_size);
619 } else {
620 if (la_size) {
621 size = la_size;
622 if (m_size && m_size < size)
623 size = m_size;
624 if (p_size && p_size < size)
625 size = p_size;
626 } else {
627 if (m_size)
628 size = m_size;
629 if (p_size)
630 size = p_size;
631 }
632 }
633
634 if (size == 0)
635 dev_err(DEV, "Both nodes diskless!\n");
636
637 if (u_size) {
638 if (u_size > size)
639 dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n",
640 (unsigned long)u_size>>1, (unsigned long)size>>1);
641 else
642 size = u_size;
643 }
644
645 return size;
646}
647
648/**
649 * drbd_check_al_size() - Ensures that the AL is of the right size
650 * @mdev: DRBD device.
651 *
652 * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
653 * failed, and 0 on success. You should call drbd_md_sync() after you called
654 * this function.
655 */
656static int drbd_check_al_size(struct drbd_conf *mdev)
657{
658 struct lru_cache *n, *t;
659 struct lc_element *e;
660 unsigned int in_use;
661 int i;
662
663 ERR_IF(mdev->sync_conf.al_extents < 7)
664 mdev->sync_conf.al_extents = 127;
665
666 if (mdev->act_log &&
667 mdev->act_log->nr_elements == mdev->sync_conf.al_extents)
668 return 0;
669
670 in_use = 0;
671 t = mdev->act_log;
672 n = lc_create("act_log", drbd_al_ext_cache,
673 mdev->sync_conf.al_extents, sizeof(struct lc_element), 0);
674
675 if (n == NULL) {
676 dev_err(DEV, "Cannot allocate act_log lru!\n");
677 return -ENOMEM;
678 }
679 spin_lock_irq(&mdev->al_lock);
680 if (t) {
681 for (i = 0; i < t->nr_elements; i++) {
682 e = lc_element_by_index(t, i);
683 if (e->refcnt)
684 dev_err(DEV, "refcnt(%d)==%d\n",
685 e->lc_number, e->refcnt);
686 in_use += e->refcnt;
687 }
688 }
689 if (!in_use)
690 mdev->act_log = n;
691 spin_unlock_irq(&mdev->al_lock);
692 if (in_use) {
693 dev_err(DEV, "Activity log still in use!\n");
694 lc_destroy(n);
695 return -EBUSY;
696 } else {
697 if (t)
698 lc_destroy(t);
699 }
700 drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */
701 return 0;
702}
703
704void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_seg_s) __must_hold(local)
705{
706 struct request_queue * const q = mdev->rq_queue;
707 struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
708 int max_segments = mdev->ldev->dc.max_bio_bvecs;
709
b411b363
PR		 710 max_seg_s = min(queue_max_sectors(b) * queue_logical_block_size(b), max_seg_s);
711
086fa5ff 712 blk_queue_max_hw_sectors(q, max_seg_s >> 9);
8a78362c 713 blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
b411b363
PR		 714 blk_queue_max_segment_size(q, max_seg_s);
715 blk_queue_logical_block_size(q, 512);
716 blk_queue_segment_boundary(q, PAGE_SIZE-1);
717 blk_stack_limits(&q->limits, &b->limits, 0);
718
719 if (b->merge_bvec_fn)
720 dev_warn(DEV, "Backing device's merge_bvec_fn() = %p\n",
721 b->merge_bvec_fn);
722 dev_info(DEV, "max_segment_size ( = BIO size ) = %u\n", queue_max_segment_size(q));
723
724 if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
725 dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
726 q->backing_dev_info.ra_pages,
727 b->backing_dev_info.ra_pages);
728 q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
729 }
730}
731
732/* serialize deconfig (worker exiting, doing cleanup)
733 * and reconfig (drbdsetup disk, drbdsetup net)
734 *
735 * wait for a potentially exiting worker, then restart it,
736 * or start a new one.
737 */
738static void drbd_reconfig_start(struct drbd_conf *mdev)
739{
6c6c7951 740 wait_event(mdev->state_wait, !test_and_set_bit(CONFIG_PENDING, &mdev->flags));
b411b363
PR		 741 wait_event(mdev->state_wait, !test_bit(DEVICE_DYING, &mdev->flags));
742 drbd_thread_start(&mdev->worker);
743}
744
745/* if still unconfigured, stops worker again.
746 * if configured now, clears CONFIG_PENDING.
747 * wakes potential waiters */
748static void drbd_reconfig_done(struct drbd_conf *mdev)
749{
750 spin_lock_irq(&mdev->req_lock);
751 if (mdev->state.disk == D_DISKLESS &&
752 mdev->state.conn == C_STANDALONE &&
753 mdev->state.role == R_SECONDARY) {
754 set_bit(DEVICE_DYING, &mdev->flags);
755 drbd_thread_stop_nowait(&mdev->worker);
756 } else
757 clear_bit(CONFIG_PENDING, &mdev->flags);
758 spin_unlock_irq(&mdev->req_lock);
759 wake_up(&mdev->state_wait);
760}
761
762/* does always return 0;
763 * interesting return code is in reply->ret_code */
764static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
765 struct drbd_nl_cfg_reply *reply)
766{
767 enum drbd_ret_codes retcode;
768 enum determine_dev_size dd;
769 sector_t max_possible_sectors;
770 sector_t min_md_device_sectors;
771 struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
772 struct inode *inode, *inode2;
773 struct lru_cache *resync_lru = NULL;
774 union drbd_state ns, os;
775 int rv;
776 int cp_discovered = 0;
777 int logical_block_size;
778
779 drbd_reconfig_start(mdev);
780
781 /* if you want to reconfigure, please tear down first */
782 if (mdev->state.disk > D_DISKLESS) {
783 retcode = ERR_DISK_CONFIGURED;
784 goto fail;
785 }
786
787 /* allocation not in the IO path, cqueue thread context */
788 nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
789 if (!nbc) {
790 retcode = ERR_NOMEM;
791 goto fail;
792 }
793
794 nbc->dc.disk_size = DRBD_DISK_SIZE_SECT_DEF;
795 nbc->dc.on_io_error = DRBD_ON_IO_ERROR_DEF;
796 nbc->dc.fencing = DRBD_FENCING_DEF;
797 nbc->dc.max_bio_bvecs = DRBD_MAX_BIO_BVECS_DEF;
798
799 if (!disk_conf_from_tags(mdev, nlp->tag_list, &nbc->dc)) {
800 retcode = ERR_MANDATORY_TAG;
801 goto fail;
802 }
803
804 if (nbc->dc.meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
805 retcode = ERR_MD_IDX_INVALID;
806 goto fail;
807 }
808
809 nbc->lo_file = filp_open(nbc->dc.backing_dev, O_RDWR, 0);
810 if (IS_ERR(nbc->lo_file)) {
811 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev,
812 PTR_ERR(nbc->lo_file));
813 nbc->lo_file = NULL;
814 retcode = ERR_OPEN_DISK;
815 goto fail;
816 }
817
818 inode = nbc->lo_file->f_dentry->d_inode;
819
820 if (!S_ISBLK(inode->i_mode)) {
821 retcode = ERR_DISK_NOT_BDEV;
822 goto fail;
823 }
824
825 nbc->md_file = filp_open(nbc->dc.meta_dev, O_RDWR, 0);
826 if (IS_ERR(nbc->md_file)) {
827 dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev,
828 PTR_ERR(nbc->md_file));
829 nbc->md_file = NULL;
830 retcode = ERR_OPEN_MD_DISK;
831 goto fail;
832 }
833
834 inode2 = nbc->md_file->f_dentry->d_inode;
835
836 if (!S_ISBLK(inode2->i_mode)) {
837 retcode = ERR_MD_NOT_BDEV;
838 goto fail;
839 }
840
841 nbc->backing_bdev = inode->i_bdev;
842 if (bd_claim(nbc->backing_bdev, mdev)) {
843 printk(KERN_ERR "drbd: bd_claim(%p,%p); failed [%p;%p;%u]\n",
844 nbc->backing_bdev, mdev,
845 nbc->backing_bdev->bd_holder,
846 nbc->backing_bdev->bd_contains->bd_holder,
847 nbc->backing_bdev->bd_holders);
848 retcode = ERR_BDCLAIM_DISK;
849 goto fail;
850 }
851
852 resync_lru = lc_create("resync", drbd_bm_ext_cache,
853 61, sizeof(struct bm_extent),
854 offsetof(struct bm_extent, lce));
855 if (!resync_lru) {
856 retcode = ERR_NOMEM;
857 goto release_bdev_fail;
858 }
859
860 /* meta_dev_idx >= 0: external fixed size,
861 * possibly multiple drbd sharing one meta device.
862 * TODO in that case, paranoia check that [md_bdev, meta_dev_idx] is
863 * not yet used by some other drbd minor!
864 * (if you use drbd.conf + drbdadm,
865 * that should check it for you already; but if you don't, or someone
866 * fooled it, we need to double check here) */
867 nbc->md_bdev = inode2->i_bdev;
868 if (bd_claim(nbc->md_bdev, (nbc->dc.meta_dev_idx < 0) ? (void *)mdev
869 : (void *) drbd_m_holder)) {
870 retcode = ERR_BDCLAIM_MD_DISK;
871 goto release_bdev_fail;
872 }
873
874 if ((nbc->backing_bdev == nbc->md_bdev) !=
875 (nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
876 nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
877 retcode = ERR_MD_IDX_INVALID;
878 goto release_bdev2_fail;
879 }
880
881 /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
882 drbd_md_set_sector_offsets(mdev, nbc);
883
884 if (drbd_get_max_capacity(nbc) < nbc->dc.disk_size) {
885 dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
886 (unsigned long long) drbd_get_max_capacity(nbc),
887 (unsigned long long) nbc->dc.disk_size);
888 retcode = ERR_DISK_TO_SMALL;
889 goto release_bdev2_fail;
890 }
891
892 if (nbc->dc.meta_dev_idx < 0) {
893 max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
894 /* at least one MB, otherwise it does not make sense */
895 min_md_device_sectors = (2<<10);
896 } else {
897 max_possible_sectors = DRBD_MAX_SECTORS;
898 min_md_device_sectors = MD_RESERVED_SECT * (nbc->dc.meta_dev_idx + 1);
899 }
900
b411b363
PR		 901 if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
902 retcode = ERR_MD_DISK_TO_SMALL;
903 dev_warn(DEV, "refusing attach: md-device too small, "
904 "at least %llu sectors needed for this meta-disk type\n",
905 (unsigned long long) min_md_device_sectors);
906 goto release_bdev2_fail;
907 }
908
909 /* Make sure the new disk is big enough
910 * (we may currently be R_PRIMARY with no local disk...) */
911 if (drbd_get_max_capacity(nbc) <
912 drbd_get_capacity(mdev->this_bdev)) {
913 retcode = ERR_DISK_TO_SMALL;
914 goto release_bdev2_fail;
915 }
916
917 nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
918
1352994b
LE		 919 if (nbc->known_size > max_possible_sectors) {
920 dev_warn(DEV, "==> truncating very big lower level device "
921 "to currently maximum possible %llu sectors <==\n",
922 (unsigned long long) max_possible_sectors);
923 if (nbc->dc.meta_dev_idx >= 0)
924 dev_warn(DEV, "==>> using internal or flexible "
925 "meta data may help <<==\n");
926 }
927
b411b363
PR		 928 drbd_suspend_io(mdev);
929 /* also wait for the last barrier ack. */
930 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt));
931 /* and for any other previously queued work */
932 drbd_flush_workqueue(mdev);
933
934 retcode = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
935 drbd_resume_io(mdev);
936 if (retcode < SS_SUCCESS)
937 goto release_bdev2_fail;
938
939 if (!get_ldev_if_state(mdev, D_ATTACHING))
940 goto force_diskless;
941
942 drbd_md_set_sector_offsets(mdev, nbc);
943
4aa83b7b
LE		 944 /* allocate a second IO page if logical_block_size != 512 */
945 logical_block_size = bdev_logical_block_size(nbc->md_bdev);
946 if (logical_block_size == 0)
947 logical_block_size = MD_SECTOR_SIZE;
948
949 if (logical_block_size != MD_SECTOR_SIZE) {
950 if (!mdev->md_io_tmpp) {
951 struct page *page = alloc_page(GFP_NOIO);
952 if (!page)
953 goto force_diskless_dec;
954
955 dev_warn(DEV, "Meta data's bdev logical_block_size = %d != %d\n",
956 logical_block_size, MD_SECTOR_SIZE);
957 dev_warn(DEV, "Workaround engaged (has performance impact).\n");
958
959 mdev->md_io_tmpp = page;
960 }
961 }
962
b411b363
PR		 963 if (!mdev->bitmap) {
964 if (drbd_bm_init(mdev)) {
965 retcode = ERR_NOMEM;
966 goto force_diskless_dec;
967 }
968 }
969
970 retcode = drbd_md_read(mdev, nbc);
971 if (retcode != NO_ERROR)
972 goto force_diskless_dec;
973
974 if (mdev->state.conn < C_CONNECTED &&
975 mdev->state.role == R_PRIMARY &&
976 (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
977 dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
978 (unsigned long long)mdev->ed_uuid);
979 retcode = ERR_DATA_NOT_CURRENT;
980 goto force_diskless_dec;
981 }
982
983 /* Since we are diskless, fix the activity log first... */
984 if (drbd_check_al_size(mdev)) {
985 retcode = ERR_NOMEM;
986 goto force_diskless_dec;
987 }
988
989 /* Prevent shrinking of consistent devices ! */
990 if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
a393db6f 991 drbd_new_dev_size(mdev, nbc, 0) < nbc->md.la_size_sect) {
b411b363
PR		 992 dev_warn(DEV, "refusing to truncate a consistent device\n");
993 retcode = ERR_DISK_TO_SMALL;
994 goto force_diskless_dec;
995 }
996
997 if (!drbd_al_read_log(mdev, nbc)) {
998 retcode = ERR_IO_MD_DISK;
999 goto force_diskless_dec;
1000 }
1001
b411b363
PR		 1002 /* Reset the "barriers don't work" bits here, then force meta data to
1003 * be written, to ensure we determine if barriers are supported. */
1004 if (nbc->dc.no_md_flush)
1005 set_bit(MD_NO_BARRIER, &mdev->flags);
1006 else
1007 clear_bit(MD_NO_BARRIER, &mdev->flags);
1008
1009 /* Point of no return reached.
1010 * Devices and memory are no longer released by error cleanup below.
1011 * now mdev takes over responsibility, and the state engine should
1012 * clean it up somewhere. */
1013 D_ASSERT(mdev->ldev == NULL);
1014 mdev->ldev = nbc;
1015 mdev->resync = resync_lru;
1016 nbc = NULL;
1017 resync_lru = NULL;
1018
1019 mdev->write_ordering = WO_bio_barrier;
1020 drbd_bump_write_ordering(mdev, WO_bio_barrier);
1021
1022 if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
1023 set_bit(CRASHED_PRIMARY, &mdev->flags);
1024 else
1025 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1026
1027 if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND)) {
1028 set_bit(CRASHED_PRIMARY, &mdev->flags);
1029 cp_discovered = 1;
1030 }
1031
1032 mdev->send_cnt = 0;
1033 mdev->recv_cnt = 0;
1034 mdev->read_cnt = 0;
1035 mdev->writ_cnt = 0;
1036
1037 drbd_setup_queue_param(mdev, DRBD_MAX_SEGMENT_SIZE);
1038
1039 /* If I am currently not R_PRIMARY,
1040 * but meta data primary indicator is set,
1041 * I just now recover from a hard crash,
1042 * and have been R_PRIMARY before that crash.
1043 *
1044 * Now, if I had no connection before that crash
1045 * (have been degraded R_PRIMARY), chances are that
1046 * I won't find my peer now either.
1047 *
1048 * In that case, and _only_ in that case,
1049 * we use the degr-wfc-timeout instead of the default,
1050 * so we can automatically recover from a crash of a
1051 * degraded but active "cluster" after a certain timeout.
1052 */
1053 clear_bit(USE_DEGR_WFC_T, &mdev->flags);
1054 if (mdev->state.role != R_PRIMARY &&
1055 drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
1056 !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
1057 set_bit(USE_DEGR_WFC_T, &mdev->flags);
1058
a393db6f 1059 dd = drbd_determin_dev_size(mdev, 0);
b411b363
PR		 1060 if (dd == dev_size_error) {
1061 retcode = ERR_NOMEM_BITMAP;
1062 goto force_diskless_dec;
1063 } else if (dd == grew)
1064 set_bit(RESYNC_AFTER_NEG, &mdev->flags);
1065
1066 if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
1067 dev_info(DEV, "Assuming that all blocks are out of sync "
1068 "(aka FullSync)\n");
1069 if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from attaching")) {
1070 retcode = ERR_IO_MD_DISK;
1071 goto force_diskless_dec;
1072 }
1073 } else {
1074 if (drbd_bitmap_io(mdev, &drbd_bm_read, "read from attaching") < 0) {
1075 retcode = ERR_IO_MD_DISK;
1076 goto force_diskless_dec;
1077 }
1078 }
1079
1080 if (cp_discovered) {
1081 drbd_al_apply_to_bm(mdev);
1082 drbd_al_to_on_disk_bm(mdev);
1083 }
1084
1085 spin_lock_irq(&mdev->req_lock);
1086 os = mdev->state;
1087 ns.i = os.i;
1088 /* If MDF_CONSISTENT is not set go into inconsistent state,
1089 otherwise investigate MDF_WasUpToDate...
1090 If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
1091 otherwise into D_CONSISTENT state.
1092 */
1093 if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
1094 if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
1095 ns.disk = D_CONSISTENT;
1096 else
1097 ns.disk = D_OUTDATED;
1098 } else {
1099 ns.disk = D_INCONSISTENT;
1100 }
1101
1102 if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
1103 ns.pdsk = D_OUTDATED;
1104
1105 if ( ns.disk == D_CONSISTENT &&
1106 (ns.pdsk == D_OUTDATED || mdev->ldev->dc.fencing == FP_DONT_CARE))
1107 ns.disk = D_UP_TO_DATE;
1108
1109 /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
1110 MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
1111 this point, because drbd_request_state() modifies these
1112 flags. */
1113
1114 /* In case we are C_CONNECTED postpone any decision on the new disk
1115 state after the negotiation phase. */
1116 if (mdev->state.conn == C_CONNECTED) {
1117 mdev->new_state_tmp.i = ns.i;
1118 ns.i = os.i;
1119 ns.disk = D_NEGOTIATING;
dc66c74d
PR		 1120
1121 /* We expect to receive up-to-date UUIDs soon.
1122 To avoid a race in receive_state, free p_uuid while
1123 holding req_lock. I.e. atomic with the state change */
1124 kfree(mdev->p_uuid);
1125 mdev->p_uuid = NULL;
b411b363
PR		 1126 }
1127
1128 rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
1129 ns = mdev->state;
1130 spin_unlock_irq(&mdev->req_lock);
1131
1132 if (rv < SS_SUCCESS)
1133 goto force_diskless_dec;
1134
1135 if (mdev->state.role == R_PRIMARY)
1136 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
1137 else
1138 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1139
1140 drbd_md_mark_dirty(mdev);
1141 drbd_md_sync(mdev);
1142
1143 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1144 put_ldev(mdev);
1145 reply->ret_code = retcode;
1146 drbd_reconfig_done(mdev);
1147 return 0;
1148
1149 force_diskless_dec:
1150 put_ldev(mdev);
1151 force_diskless:
1152 drbd_force_state(mdev, NS(disk, D_DISKLESS));
1153 drbd_md_sync(mdev);
1154 release_bdev2_fail:
1155 if (nbc)
1156 bd_release(nbc->md_bdev);
1157 release_bdev_fail:
1158 if (nbc)
1159 bd_release(nbc->backing_bdev);
1160 fail:
1161 if (nbc) {
1162 if (nbc->lo_file)
1163 fput(nbc->lo_file);
1164 if (nbc->md_file)
1165 fput(nbc->md_file);
1166 kfree(nbc);
1167 }
1168 lc_destroy(resync_lru);
1169
1170 reply->ret_code = retcode;
1171 drbd_reconfig_done(mdev);
1172 return 0;
1173}
1174
1175static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1176 struct drbd_nl_cfg_reply *reply)
1177{
1178 reply->ret_code = drbd_request_state(mdev, NS(disk, D_DISKLESS));
1179 return 0;
1180}
1181
1182static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1183 struct drbd_nl_cfg_reply *reply)
1184{
1185 int i, ns;
1186 enum drbd_ret_codes retcode;
1187 struct net_conf *new_conf = NULL;
1188 struct crypto_hash *tfm = NULL;
1189 struct crypto_hash *integrity_w_tfm = NULL;
1190 struct crypto_hash *integrity_r_tfm = NULL;
1191 struct hlist_head *new_tl_hash = NULL;
1192 struct hlist_head *new_ee_hash = NULL;
1193 struct drbd_conf *odev;
1194 char hmac_name[CRYPTO_MAX_ALG_NAME];
1195 void *int_dig_out = NULL;
1196 void *int_dig_in = NULL;
1197 void *int_dig_vv = NULL;
1198 struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr;
1199
1200 drbd_reconfig_start(mdev);
1201
1202 if (mdev->state.conn > C_STANDALONE) {
1203 retcode = ERR_NET_CONFIGURED;
1204 goto fail;
1205 }
1206
1207 /* allocation not in the IO path, cqueue thread context */
2db4e42e 1208 new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
b411b363
PR		 1209 if (!new_conf) {
1210 retcode = ERR_NOMEM;
1211 goto fail;
1212 }
1213
b411b363
PR		 1214 new_conf->timeout = DRBD_TIMEOUT_DEF;
1215 new_conf->try_connect_int = DRBD_CONNECT_INT_DEF;
1216 new_conf->ping_int = DRBD_PING_INT_DEF;
1217 new_conf->max_epoch_size = DRBD_MAX_EPOCH_SIZE_DEF;
1218 new_conf->max_buffers = DRBD_MAX_BUFFERS_DEF;
1219 new_conf->unplug_watermark = DRBD_UNPLUG_WATERMARK_DEF;
1220 new_conf->sndbuf_size = DRBD_SNDBUF_SIZE_DEF;
1221 new_conf->rcvbuf_size = DRBD_RCVBUF_SIZE_DEF;
1222 new_conf->ko_count = DRBD_KO_COUNT_DEF;
1223 new_conf->after_sb_0p = DRBD_AFTER_SB_0P_DEF;
1224 new_conf->after_sb_1p = DRBD_AFTER_SB_1P_DEF;
1225 new_conf->after_sb_2p = DRBD_AFTER_SB_2P_DEF;
1226 new_conf->want_lose = 0;
1227 new_conf->two_primaries = 0;
1228 new_conf->wire_protocol = DRBD_PROT_C;
1229 new_conf->ping_timeo = DRBD_PING_TIMEO_DEF;
1230 new_conf->rr_conflict = DRBD_RR_CONFLICT_DEF;
1231
1232 if (!net_conf_from_tags(mdev, nlp->tag_list, new_conf)) {
1233 retcode = ERR_MANDATORY_TAG;
1234 goto fail;
1235 }
1236
1237 if (new_conf->two_primaries
1238 && (new_conf->wire_protocol != DRBD_PROT_C)) {
1239 retcode = ERR_NOT_PROTO_C;
1240 goto fail;
1241 };
1242
1243 if (mdev->state.role == R_PRIMARY && new_conf->want_lose) {
1244 retcode = ERR_DISCARD;
1245 goto fail;
1246 }
1247
1248 retcode = NO_ERROR;
1249
1250 new_my_addr = (struct sockaddr *)&new_conf->my_addr;
1251 new_peer_addr = (struct sockaddr *)&new_conf->peer_addr;
1252 for (i = 0; i < minor_count; i++) {
1253 odev = minor_to_mdev(i);
1254 if (!odev || odev == mdev)
1255 continue;
1256 if (get_net_conf(odev)) {
1257 taken_addr = (struct sockaddr *)&odev->net_conf->my_addr;
1258 if (new_conf->my_addr_len == odev->net_conf->my_addr_len &&
1259 !memcmp(new_my_addr, taken_addr, new_conf->my_addr_len))
1260 retcode = ERR_LOCAL_ADDR;
1261
1262 taken_addr = (struct sockaddr *)&odev->net_conf->peer_addr;
1263 if (new_conf->peer_addr_len == odev->net_conf->peer_addr_len &&
1264 !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len))
1265 retcode = ERR_PEER_ADDR;
1266
1267 put_net_conf(odev);
1268 if (retcode != NO_ERROR)
1269 goto fail;
1270 }
1271 }
1272
1273 if (new_conf->cram_hmac_alg[0] != 0) {
1274 snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
1275 new_conf->cram_hmac_alg);
1276 tfm = crypto_alloc_hash(hmac_name, 0, CRYPTO_ALG_ASYNC);
1277 if (IS_ERR(tfm)) {
1278 tfm = NULL;
1279 retcode = ERR_AUTH_ALG;
1280 goto fail;
1281 }
1282
0798219f 1283 if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) {
b411b363
PR		 1284 retcode = ERR_AUTH_ALG_ND;
1285 goto fail;
1286 }
1287 }
1288
1289 if (new_conf->integrity_alg[0]) {
1290 integrity_w_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1291 if (IS_ERR(integrity_w_tfm)) {
1292 integrity_w_tfm = NULL;
1293 retcode=ERR_INTEGRITY_ALG;
1294 goto fail;
1295 }
1296
1297 if (!drbd_crypto_is_hash(crypto_hash_tfm(integrity_w_tfm))) {
1298 retcode=ERR_INTEGRITY_ALG_ND;
1299 goto fail;
1300 }
1301
1302 integrity_r_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
1303 if (IS_ERR(integrity_r_tfm)) {
1304 integrity_r_tfm = NULL;
1305 retcode=ERR_INTEGRITY_ALG;
1306 goto fail;
1307 }
1308 }
1309
1310 ns = new_conf->max_epoch_size/8;
1311 if (mdev->tl_hash_s != ns) {
1312 new_tl_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
1313 if (!new_tl_hash) {
1314 retcode = ERR_NOMEM;
1315 goto fail;
1316 }
1317 }
1318
1319 ns = new_conf->max_buffers/8;
1320 if (new_conf->two_primaries && (mdev->ee_hash_s != ns)) {
1321 new_ee_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
1322 if (!new_ee_hash) {
1323 retcode = ERR_NOMEM;
1324 goto fail;
1325 }
1326 }
1327
1328 ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
1329
1330 if (integrity_w_tfm) {
1331 i = crypto_hash_digestsize(integrity_w_tfm);
1332 int_dig_out = kmalloc(i, GFP_KERNEL);
1333 if (!int_dig_out) {
1334 retcode = ERR_NOMEM;
1335 goto fail;
1336 }
1337 int_dig_in = kmalloc(i, GFP_KERNEL);
1338 if (!int_dig_in) {
1339 retcode = ERR_NOMEM;
1340 goto fail;
1341 }
1342 int_dig_vv = kmalloc(i, GFP_KERNEL);
1343 if (!int_dig_vv) {
1344 retcode = ERR_NOMEM;
1345 goto fail;
1346 }
1347 }
1348
1349 if (!mdev->bitmap) {
1350 if(drbd_bm_init(mdev)) {
1351 retcode = ERR_NOMEM;
1352 goto fail;
1353 }
1354 }
1355
1356 spin_lock_irq(&mdev->req_lock);
1357 if (mdev->net_conf != NULL) {
1358 retcode = ERR_NET_CONFIGURED;
1359 spin_unlock_irq(&mdev->req_lock);
1360 goto fail;
1361 }
1362 mdev->net_conf = new_conf;
1363
1364 mdev->send_cnt = 0;
1365 mdev->recv_cnt = 0;
1366
1367 if (new_tl_hash) {
1368 kfree(mdev->tl_hash);
1369 mdev->tl_hash_s = mdev->net_conf->max_epoch_size/8;
1370 mdev->tl_hash = new_tl_hash;
1371 }
1372
1373 if (new_ee_hash) {
1374 kfree(mdev->ee_hash);
1375 mdev->ee_hash_s = mdev->net_conf->max_buffers/8;
1376 mdev->ee_hash = new_ee_hash;
1377 }
1378
1379 crypto_free_hash(mdev->cram_hmac_tfm);
1380 mdev->cram_hmac_tfm = tfm;
1381
1382 crypto_free_hash(mdev->integrity_w_tfm);
1383 mdev->integrity_w_tfm = integrity_w_tfm;
1384
1385 crypto_free_hash(mdev->integrity_r_tfm);
1386 mdev->integrity_r_tfm = integrity_r_tfm;
1387
1388 kfree(mdev->int_dig_out);
1389 kfree(mdev->int_dig_in);
1390 kfree(mdev->int_dig_vv);
1391 mdev->int_dig_out=int_dig_out;
1392 mdev->int_dig_in=int_dig_in;
1393 mdev->int_dig_vv=int_dig_vv;
1394 spin_unlock_irq(&mdev->req_lock);
1395
1396 retcode = _drbd_request_state(mdev, NS(conn, C_UNCONNECTED), CS_VERBOSE);
1397
1398 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1399 reply->ret_code = retcode;
1400 drbd_reconfig_done(mdev);
1401 return 0;
1402
1403fail:
1404 kfree(int_dig_out);
1405 kfree(int_dig_in);
1406 kfree(int_dig_vv);
1407 crypto_free_hash(tfm);
1408 crypto_free_hash(integrity_w_tfm);
1409 crypto_free_hash(integrity_r_tfm);
1410 kfree(new_tl_hash);
1411 kfree(new_ee_hash);
1412 kfree(new_conf);
1413
1414 reply->ret_code = retcode;
1415 drbd_reconfig_done(mdev);
1416 return 0;
1417}
1418
1419static int drbd_nl_disconnect(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1420 struct drbd_nl_cfg_reply *reply)
1421{
1422 int retcode;
1423
1424 retcode = _drbd_request_state(mdev, NS(conn, C_DISCONNECTING), CS_ORDERED);
1425
1426 if (retcode == SS_NOTHING_TO_DO)
1427 goto done;
1428 else if (retcode == SS_ALREADY_STANDALONE)
1429 goto done;
1430 else if (retcode == SS_PRIMARY_NOP) {
1431 /* Our statche checking code wants to see the peer outdated. */
1432 retcode = drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
1433 pdsk, D_OUTDATED));
1434 } else if (retcode == SS_CW_FAILED_BY_PEER) {
1435 /* The peer probably wants to see us outdated. */
1436 retcode = _drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
1437 disk, D_OUTDATED),
1438 CS_ORDERED);
1439 if (retcode == SS_IS_DISKLESS || retcode == SS_LOWER_THAN_OUTDATED) {
1440 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
1441 retcode = SS_SUCCESS;
1442 }
1443 }
1444
1445 if (retcode < SS_SUCCESS)
1446 goto fail;
1447
1448 if (wait_event_interruptible(mdev->state_wait,
1449 mdev->state.conn != C_DISCONNECTING)) {
1450 /* Do not test for mdev->state.conn == C_STANDALONE, since
1451 someone else might connect us in the mean time! */
1452 retcode = ERR_INTR;
1453 goto fail;
1454 }
1455
1456 done:
1457 retcode = NO_ERROR;
1458 fail:
1459 drbd_md_sync(mdev);
1460 reply->ret_code = retcode;
1461 return 0;
1462}
1463
1464void resync_after_online_grow(struct drbd_conf *mdev)
1465{
1466 int iass; /* I am sync source */
1467
1468 dev_info(DEV, "Resync of new storage after online grow\n");
1469 if (mdev->state.role != mdev->state.peer)
1470 iass = (mdev->state.role == R_PRIMARY);
1471 else
1472 iass = test_bit(DISCARD_CONCURRENT, &mdev->flags);
1473
1474 if (iass)
1475 drbd_start_resync(mdev, C_SYNC_SOURCE);
1476 else
1477 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
1478}
1479
1480static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1481 struct drbd_nl_cfg_reply *reply)
1482{
1483 struct resize rs;
1484 int retcode = NO_ERROR;
b411b363 1485 enum determine_dev_size dd;
6495d2c6 1486 enum dds_flags ddsf;
b411b363
PR		 1487
1488 memset(&rs, 0, sizeof(struct resize));
1489 if (!resize_from_tags(mdev, nlp->tag_list, &rs)) {
1490 retcode = ERR_MANDATORY_TAG;
1491 goto fail;
1492 }
1493
1494 if (mdev->state.conn > C_CONNECTED) {
1495 retcode = ERR_RESIZE_RESYNC;
1496 goto fail;
1497 }
1498
1499 if (mdev->state.role == R_SECONDARY &&
1500 mdev->state.peer == R_SECONDARY) {
1501 retcode = ERR_NO_PRIMARY;
1502 goto fail;
1503 }
1504
1505 if (!get_ldev(mdev)) {
1506 retcode = ERR_NO_DISK;
1507 goto fail;
1508 }
1509
6495d2c6
PR		 1510 if (rs.no_resync && mdev->agreed_pro_version < 93) {
1511 retcode = ERR_NEED_APV_93;
1512 goto fail;
1513 }
1514
087c2492 1515 if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev))
b411b363 1516 mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
b411b363
PR		 1517
1518 mdev->ldev->dc.disk_size = (sector_t)rs.resize_size;
6495d2c6
PR		 1519 ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
1520 dd = drbd_determin_dev_size(mdev, ddsf);
b411b363
PR		 1521 drbd_md_sync(mdev);
1522 put_ldev(mdev);
1523 if (dd == dev_size_error) {
1524 retcode = ERR_NOMEM_BITMAP;
1525 goto fail;
1526 }
1527
087c2492 1528 if (mdev->state.conn == C_CONNECTED) {
b411b363
PR		 1529 if (dd == grew)
1530 set_bit(RESIZE_PENDING, &mdev->flags);
1531
1532 drbd_send_uuids(mdev);
6495d2c6 1533 drbd_send_sizes(mdev, 1, ddsf);
b411b363
PR		 1534 }
1535
1536 fail:
1537 reply->ret_code = retcode;
1538 return 0;
1539}
1540
1541static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1542 struct drbd_nl_cfg_reply *reply)
1543{
1544 int retcode = NO_ERROR;
1545 int err;
1546 int ovr; /* online verify running */
1547 int rsr; /* re-sync running */
1548 struct crypto_hash *verify_tfm = NULL;
1549 struct crypto_hash *csums_tfm = NULL;
1550 struct syncer_conf sc;
1551 cpumask_var_t new_cpu_mask;
1552
1553 if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) {
1554 retcode = ERR_NOMEM;
1555 goto fail;
1556 }
1557
1558 if (nlp->flags & DRBD_NL_SET_DEFAULTS) {
1559 memset(&sc, 0, sizeof(struct syncer_conf));
1560 sc.rate = DRBD_RATE_DEF;
1561 sc.after = DRBD_AFTER_DEF;
1562 sc.al_extents = DRBD_AL_EXTENTS_DEF;
265be2d0 1563 sc.on_no_data = DRBD_ON_NO_DATA_DEF;
b411b363
PR		 1564 } else
1565 memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf));
1566
1567 if (!syncer_conf_from_tags(mdev, nlp->tag_list, &sc)) {
1568 retcode = ERR_MANDATORY_TAG;
1569 goto fail;
1570 }
1571
1572 /* re-sync running */
1573 rsr = ( mdev->state.conn == C_SYNC_SOURCE ||
1574 mdev->state.conn == C_SYNC_TARGET ||
1575 mdev->state.conn == C_PAUSED_SYNC_S ||
1576 mdev->state.conn == C_PAUSED_SYNC_T );
1577
1578 if (rsr && strcmp(sc.csums_alg, mdev->sync_conf.csums_alg)) {
1579 retcode = ERR_CSUMS_RESYNC_RUNNING;
1580 goto fail;
1581 }
1582
1583 if (!rsr && sc.csums_alg[0]) {
1584 csums_tfm = crypto_alloc_hash(sc.csums_alg, 0, CRYPTO_ALG_ASYNC);
1585 if (IS_ERR(csums_tfm)) {
1586 csums_tfm = NULL;
1587 retcode = ERR_CSUMS_ALG;
1588 goto fail;
1589 }
1590
1591 if (!drbd_crypto_is_hash(crypto_hash_tfm(csums_tfm))) {
1592 retcode = ERR_CSUMS_ALG_ND;
1593 goto fail;
1594 }
1595 }
1596
1597 /* online verify running */
1598 ovr = (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T);
1599
1600 if (ovr) {
1601 if (strcmp(sc.verify_alg, mdev->sync_conf.verify_alg)) {
1602 retcode = ERR_VERIFY_RUNNING;
1603 goto fail;
1604 }
1605 }
1606
1607 if (!ovr && sc.verify_alg[0]) {
1608 verify_tfm = crypto_alloc_hash(sc.verify_alg, 0, CRYPTO_ALG_ASYNC);
1609 if (IS_ERR(verify_tfm)) {
1610 verify_tfm = NULL;
1611 retcode = ERR_VERIFY_ALG;
1612 goto fail;
1613 }
1614
1615 if (!drbd_crypto_is_hash(crypto_hash_tfm(verify_tfm))) {
1616 retcode = ERR_VERIFY_ALG_ND;
1617 goto fail;
1618 }
1619 }
1620
1621 /* silently ignore cpu mask on UP kernel */
1622 if (nr_cpu_ids > 1 && sc.cpu_mask[0] != 0) {
1623 err = __bitmap_parse(sc.cpu_mask, 32, 0,
1624 cpumask_bits(new_cpu_mask), nr_cpu_ids);
1625 if (err) {
1626 dev_warn(DEV, "__bitmap_parse() failed with %d\n", err);
1627 retcode = ERR_CPU_MASK_PARSE;
1628 goto fail;
1629 }
1630 }
1631
1632 ERR_IF (sc.rate < 1) sc.rate = 1;
1633 ERR_IF (sc.al_extents < 7) sc.al_extents = 127; /* arbitrary minimum */
1634#define AL_MAX ((MD_AL_MAX_SIZE-1) * AL_EXTENTS_PT)
1635 if (sc.al_extents > AL_MAX) {
1636 dev_err(DEV, "sc.al_extents > %d\n", AL_MAX);
1637 sc.al_extents = AL_MAX;
1638 }
1639#undef AL_MAX
1640
1641 /* most sanity checks done, try to assign the new sync-after
1642 * dependency. need to hold the global lock in there,
1643 * to avoid a race in the dependency loop check. */
1644 retcode = drbd_alter_sa(mdev, sc.after);
1645 if (retcode != NO_ERROR)
1646 goto fail;
1647
1648 /* ok, assign the rest of it as well.
1649 * lock against receive_SyncParam() */
1650 spin_lock(&mdev->peer_seq_lock);
1651 mdev->sync_conf = sc;
1652
1653 if (!rsr) {
1654 crypto_free_hash(mdev->csums_tfm);
1655 mdev->csums_tfm = csums_tfm;
1656 csums_tfm = NULL;
1657 }
1658
1659 if (!ovr) {
1660 crypto_free_hash(mdev->verify_tfm);
1661 mdev->verify_tfm = verify_tfm;
1662 verify_tfm = NULL;
1663 }
1664 spin_unlock(&mdev->peer_seq_lock);
1665
1666 if (get_ldev(mdev)) {
1667 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
1668 drbd_al_shrink(mdev);
1669 err = drbd_check_al_size(mdev);
1670 lc_unlock(mdev->act_log);
1671 wake_up(&mdev->al_wait);
1672
1673 put_ldev(mdev);
1674 drbd_md_sync(mdev);
1675
1676 if (err) {
1677 retcode = ERR_NOMEM;
1678 goto fail;
1679 }
1680 }
1681
1682 if (mdev->state.conn >= C_CONNECTED)
1683 drbd_send_sync_param(mdev, &sc);
1684
1685 if (!cpumask_equal(mdev->cpu_mask, new_cpu_mask)) {
1686 cpumask_copy(mdev->cpu_mask, new_cpu_mask);
1687 drbd_calc_cpu_mask(mdev);
1688 mdev->receiver.reset_cpu_mask = 1;
1689 mdev->asender.reset_cpu_mask = 1;
1690 mdev->worker.reset_cpu_mask = 1;
1691 }
1692
1693 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1694fail:
1695 free_cpumask_var(new_cpu_mask);
1696 crypto_free_hash(csums_tfm);
1697 crypto_free_hash(verify_tfm);
1698 reply->ret_code = retcode;
1699 return 0;
1700}
1701
1702static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1703 struct drbd_nl_cfg_reply *reply)
1704{
1705 int retcode;
1706
1707 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
1708
1709 if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
1710 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1711
1712 while (retcode == SS_NEED_CONNECTION) {
1713 spin_lock_irq(&mdev->req_lock);
1714 if (mdev->state.conn < C_CONNECTED)
1715 retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL);
1716 spin_unlock_irq(&mdev->req_lock);
1717
1718 if (retcode != SS_NEED_CONNECTION)
1719 break;
1720
1721 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1722 }
1723
1724 reply->ret_code = retcode;
1725 return 0;
1726}
1727
1728static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1729 struct drbd_nl_cfg_reply *reply)
1730{
1731
1732 reply->ret_code = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
1733
1734 return 0;
1735}
1736
1737static int drbd_nl_pause_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1738 struct drbd_nl_cfg_reply *reply)
1739{
1740 int retcode = NO_ERROR;
1741
1742 if (drbd_request_state(mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
1743 retcode = ERR_PAUSE_IS_SET;
1744
1745 reply->ret_code = retcode;
1746 return 0;
1747}
1748
1749static int drbd_nl_resume_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1750 struct drbd_nl_cfg_reply *reply)
1751{
1752 int retcode = NO_ERROR;
1753
1754 if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO)
1755 retcode = ERR_PAUSE_IS_CLEAR;
1756
1757 reply->ret_code = retcode;
1758 return 0;
1759}
1760
1761static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1762 struct drbd_nl_cfg_reply *reply)
1763{
1764 reply->ret_code = drbd_request_state(mdev, NS(susp, 1));
1765
1766 return 0;
1767}
1768
1769static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1770 struct drbd_nl_cfg_reply *reply)
1771{
265be2d0 1772 drbd_suspend_io(mdev);
b411b363 1773 reply->ret_code = drbd_request_state(mdev, NS(susp, 0));
265be2d0
PR		 1774 if (reply->ret_code == SS_SUCCESS) {
1775 if (mdev->state.conn < C_CONNECTED)
1776 tl_clear(mdev);
1777 if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED)
1778 tl_restart(mdev, fail_frozen_disk_io);
1779 }
1780 drbd_resume_io(mdev);
1781
b411b363
PR		 1782 return 0;
1783}
1784
1785static int drbd_nl_outdate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1786 struct drbd_nl_cfg_reply *reply)
1787{
1788 reply->ret_code = drbd_request_state(mdev, NS(disk, D_OUTDATED));
1789 return 0;
1790}
1791
1792static int drbd_nl_get_config(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1793 struct drbd_nl_cfg_reply *reply)
1794{
1795 unsigned short *tl;
1796
1797 tl = reply->tag_list;
1798
1799 if (get_ldev(mdev)) {
1800 tl = disk_conf_to_tags(mdev, &mdev->ldev->dc, tl);
1801 put_ldev(mdev);
1802 }
1803
1804 if (get_net_conf(mdev)) {
1805 tl = net_conf_to_tags(mdev, mdev->net_conf, tl);
1806 put_net_conf(mdev);
1807 }
1808 tl = syncer_conf_to_tags(mdev, &mdev->sync_conf, tl);
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_state(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1816 struct drbd_nl_cfg_reply *reply)
1817{
1818 unsigned short *tl = reply->tag_list;
1819 union drbd_state s = mdev->state;
1820 unsigned long rs_left;
1821 unsigned int res;
1822
1823 tl = get_state_to_tags(mdev, (struct get_state *)&s, tl);
1824
1825 /* no local ref, no bitmap, no syncer progress. */
1826 if (s.conn >= C_SYNC_SOURCE && s.conn <= C_PAUSED_SYNC_T) {
1827 if (get_ldev(mdev)) {
1828 drbd_get_syncer_progress(mdev, &rs_left, &res);
1829 tl = tl_add_int(tl, T_sync_progress, &res);
1830 put_ldev(mdev);
1831 }
1832 }
1833 put_unaligned(TT_END, tl++); /* Close the tag list */
1834
1835 return (int)((char *)tl - (char *)reply->tag_list);
1836}
1837
1838static int drbd_nl_get_uuids(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1839 struct drbd_nl_cfg_reply *reply)
1840{
1841 unsigned short *tl;
1842
1843 tl = reply->tag_list;
1844
1845 if (get_ldev(mdev)) {
1846 tl = tl_add_blob(tl, T_uuids, mdev->ldev->md.uuid, UI_SIZE*sizeof(u64));
1847 tl = tl_add_int(tl, T_uuids_flags, &mdev->ldev->md.flags);
1848 put_ldev(mdev);
1849 }
1850 put_unaligned(TT_END, tl++); /* Close the tag list */
1851
1852 return (int)((char *)tl - (char *)reply->tag_list);
1853}
1854
1855/**
1856 * drbd_nl_get_timeout_flag() - Used by drbdsetup to find out which timeout value to use
1857 * @mdev: DRBD device.
1858 * @nlp: Netlink/connector packet from drbdsetup
1859 * @reply: Reply packet for drbdsetup
1860 */
1861static int drbd_nl_get_timeout_flag(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1862 struct drbd_nl_cfg_reply *reply)
1863{
1864 unsigned short *tl;
1865 char rv;
1866
1867 tl = reply->tag_list;
1868
1869 rv = mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
1870 test_bit(USE_DEGR_WFC_T, &mdev->flags) ? UT_DEGRADED : UT_DEFAULT;
1871
1872 tl = tl_add_blob(tl, T_use_degraded, &rv, sizeof(rv));
1873 put_unaligned(TT_END, tl++); /* Close the tag list */
1874
1875 return (int)((char *)tl - (char *)reply->tag_list);
1876}
1877
1878static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1879 struct drbd_nl_cfg_reply *reply)
1880{
1881 /* default to resume from last known position, if possible */
1882 struct start_ov args =
1883 { .start_sector = mdev->ov_start_sector };
1884
1885 if (!start_ov_from_tags(mdev, nlp->tag_list, &args)) {
1886 reply->ret_code = ERR_MANDATORY_TAG;
1887 return 0;
1888 }
1889 /* w_make_ov_request expects position to be aligned */
1890 mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT;
1891 reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
1892 return 0;
1893}
1894
1895
1896static int drbd_nl_new_c_uuid(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1897 struct drbd_nl_cfg_reply *reply)
1898{
1899 int retcode = NO_ERROR;
1900 int skip_initial_sync = 0;
1901 int err;
1902
1903 struct new_c_uuid args;
1904
1905 memset(&args, 0, sizeof(struct new_c_uuid));
1906 if (!new_c_uuid_from_tags(mdev, nlp->tag_list, &args)) {
1907 reply->ret_code = ERR_MANDATORY_TAG;
1908 return 0;
1909 }
1910
1911 mutex_lock(&mdev->state_mutex); /* Protects us against serialized state changes. */
1912
1913 if (!get_ldev(mdev)) {
1914 retcode = ERR_NO_DISK;
1915 goto out;
1916 }
1917
1918 /* this is "skip initial sync", assume to be clean */
1919 if (mdev->state.conn == C_CONNECTED && mdev->agreed_pro_version >= 90 &&
1920 mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
1921 dev_info(DEV, "Preparing to skip initial sync\n");
1922 skip_initial_sync = 1;
1923 } else if (mdev->state.conn != C_STANDALONE) {
1924 retcode = ERR_CONNECTED;
1925 goto out_dec;
1926 }
1927
1928 drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
1929 drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
1930
1931 if (args.clear_bm) {
1932 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, "clear_n_write from new_c_uuid");
1933 if (err) {
1934 dev_err(DEV, "Writing bitmap failed with %d\n",err);
1935 retcode = ERR_IO_MD_DISK;
1936 }
1937 if (skip_initial_sync) {
1938 drbd_send_uuids_skip_initial_sync(mdev);
1939 _drbd_uuid_set(mdev, UI_BITMAP, 0);
1940 spin_lock_irq(&mdev->req_lock);
1941 _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
1942 CS_VERBOSE, NULL);
1943 spin_unlock_irq(&mdev->req_lock);
1944 }
1945 }
1946
1947 drbd_md_sync(mdev);
1948out_dec:
1949 put_ldev(mdev);
1950out:
1951 mutex_unlock(&mdev->state_mutex);
1952
1953 reply->ret_code = retcode;
1954 return 0;
1955}
1956
1957static struct drbd_conf *ensure_mdev(struct drbd_nl_cfg_req *nlp)
1958{
1959 struct drbd_conf *mdev;
1960
1961 if (nlp->drbd_minor >= minor_count)
1962 return NULL;
1963
1964 mdev = minor_to_mdev(nlp->drbd_minor);
1965
1966 if (!mdev && (nlp->flags & DRBD_NL_CREATE_DEVICE)) {
1967 struct gendisk *disk = NULL;
1968 mdev = drbd_new_device(nlp->drbd_minor);
1969
1970 spin_lock_irq(&drbd_pp_lock);
1971 if (minor_table[nlp->drbd_minor] == NULL) {
1972 minor_table[nlp->drbd_minor] = mdev;
1973 disk = mdev->vdisk;
1974 mdev = NULL;
1975 } /* else: we lost the race */
1976 spin_unlock_irq(&drbd_pp_lock);
1977
1978 if (disk) /* we won the race above */
1979 /* in case we ever add a drbd_delete_device(),
1980 * don't forget the del_gendisk! */
1981 add_disk(disk);
1982 else /* we lost the race above */
1983 drbd_free_mdev(mdev);
1984
1985 mdev = minor_to_mdev(nlp->drbd_minor);
1986 }
1987
1988 return mdev;
1989}
1990
1991struct cn_handler_struct {
1992 int (*function)(struct drbd_conf *,
1993 struct drbd_nl_cfg_req *,
1994 struct drbd_nl_cfg_reply *);
1995 int reply_body_size;
1996};
1997
1998static struct cn_handler_struct cnd_table[] = {
1999 [ P_primary ] = { &drbd_nl_primary, 0 },
2000 [ P_secondary ] = { &drbd_nl_secondary, 0 },
2001 [ P_disk_conf ] = { &drbd_nl_disk_conf, 0 },
2002 [ P_detach ] = { &drbd_nl_detach, 0 },
2003 [ P_net_conf ] = { &drbd_nl_net_conf, 0 },
2004 [ P_disconnect ] = { &drbd_nl_disconnect, 0 },
2005 [ P_resize ] = { &drbd_nl_resize, 0 },
2006 [ P_syncer_conf ] = { &drbd_nl_syncer_conf, 0 },
2007 [ P_invalidate ] = { &drbd_nl_invalidate, 0 },
2008 [ P_invalidate_peer ] = { &drbd_nl_invalidate_peer, 0 },
2009 [ P_pause_sync ] = { &drbd_nl_pause_sync, 0 },
2010 [ P_resume_sync ] = { &drbd_nl_resume_sync, 0 },
2011 [ P_suspend_io ] = { &drbd_nl_suspend_io, 0 },
2012 [ P_resume_io ] = { &drbd_nl_resume_io, 0 },
2013 [ P_outdate ] = { &drbd_nl_outdate, 0 },
2014 [ P_get_config ] = { &drbd_nl_get_config,
2015 sizeof(struct syncer_conf_tag_len_struct) +
2016 sizeof(struct disk_conf_tag_len_struct) +
2017 sizeof(struct net_conf_tag_len_struct) },
2018 [ P_get_state ] = { &drbd_nl_get_state,
2019 sizeof(struct get_state_tag_len_struct) +
2020 sizeof(struct sync_progress_tag_len_struct) },
2021 [ P_get_uuids ] = { &drbd_nl_get_uuids,
2022 sizeof(struct get_uuids_tag_len_struct) },
2023 [ P_get_timeout_flag ] = { &drbd_nl_get_timeout_flag,
2024 sizeof(struct get_timeout_flag_tag_len_struct)},
2025 [ P_start_ov ] = { &drbd_nl_start_ov, 0 },
2026 [ P_new_c_uuid ] = { &drbd_nl_new_c_uuid, 0 },
2027};
2028
9f5180e5 2029static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp)
b411b363
PR		 2030{
2031 struct drbd_nl_cfg_req *nlp = (struct drbd_nl_cfg_req *)req->data;
2032 struct cn_handler_struct *cm;
2033 struct cn_msg *cn_reply;
2034 struct drbd_nl_cfg_reply *reply;
2035 struct drbd_conf *mdev;
2036 int retcode, rr;
2037 int reply_size = sizeof(struct cn_msg)
2038 + sizeof(struct drbd_nl_cfg_reply)
2039 + sizeof(short int);
2040
2041 if (!try_module_get(THIS_MODULE)) {
2042 printk(KERN_ERR "drbd: try_module_get() failed!\n");
2043 return;
2044 }
2045
9f5180e5
PR		 2046 if (!cap_raised(nsp->eff_cap, CAP_SYS_ADMIN)) {
2047 retcode = ERR_PERM;
2048 goto fail;
2049 }
2050
b411b363
PR		 2051 mdev = ensure_mdev(nlp);
2052 if (!mdev) {
2053 retcode = ERR_MINOR_INVALID;
2054 goto fail;
2055 }
2056
b411b363
PR		 2057 if (nlp->packet_type >= P_nl_after_last_packet) {
2058 retcode = ERR_PACKET_NR;
2059 goto fail;
2060 }
2061
2062 cm = cnd_table + nlp->packet_type;
2063
2064 /* This may happen if packet number is 0: */
2065 if (cm->function == NULL) {
2066 retcode = ERR_PACKET_NR;
2067 goto fail;
2068 }
2069
2070 reply_size += cm->reply_body_size;
2071
2072 /* allocation not in the IO path, cqueue thread context */
2073 cn_reply = kmalloc(reply_size, GFP_KERNEL);
2074 if (!cn_reply) {
2075 retcode = ERR_NOMEM;
2076 goto fail;
2077 }
2078 reply = (struct drbd_nl_cfg_reply *) cn_reply->data;
2079
2080 reply->packet_type =
2081 cm->reply_body_size ? nlp->packet_type : P_nl_after_last_packet;
2082 reply->minor = nlp->drbd_minor;
2083 reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */
2084 /* reply->tag_list; might be modified by cm->function. */
2085
2086 rr = cm->function(mdev, nlp, reply);
2087
2088 cn_reply->id = req->id;
2089 cn_reply->seq = req->seq;
2090 cn_reply->ack = req->ack + 1;
2091 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + rr;
2092 cn_reply->flags = 0;
2093
b411b363
PR		 2094 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL);
2095 if (rr && rr != -ESRCH)
2096 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2097
2098 kfree(cn_reply);
2099 module_put(THIS_MODULE);
2100 return;
2101 fail:
2102 drbd_nl_send_reply(req, retcode);
2103 module_put(THIS_MODULE);
2104}
2105
2106static atomic_t drbd_nl_seq = ATOMIC_INIT(2); /* two. */
2107
2108static unsigned short *
2109__tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data,
2110 unsigned short len, int nul_terminated)
2111{
2112 unsigned short l = tag_descriptions[tag_number(tag)].max_len;
2113 len = (len < l) ? len : l;
2114 put_unaligned(tag, tl++);
2115 put_unaligned(len, tl++);
2116 memcpy(tl, data, len);
2117 tl = (unsigned short*)((char*)tl + len);
2118 if (nul_terminated)
2119 *((char*)tl - 1) = 0;
2120 return tl;
2121}
2122
2123static unsigned short *
2124tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, int len)
2125{
2126 return __tl_add_blob(tl, tag, data, len, 0);
2127}
2128
2129static unsigned short *
2130tl_add_str(unsigned short *tl, enum drbd_tags tag, const char *str)
2131{
2132 return __tl_add_blob(tl, tag, str, strlen(str)+1, 0);
2133}
2134
2135static unsigned short *
2136tl_add_int(unsigned short *tl, enum drbd_tags tag, const void *val)
2137{
2138 put_unaligned(tag, tl++);
2139 switch(tag_type(tag)) {
2140 case TT_INTEGER:
2141 put_unaligned(sizeof(int), tl++);
2142 put_unaligned(*(int *)val, (int *)tl);
2143 tl = (unsigned short*)((char*)tl+sizeof(int));
2144 break;
2145 case TT_INT64:
2146 put_unaligned(sizeof(u64), tl++);
2147 put_unaligned(*(u64 *)val, (u64 *)tl);
2148 tl = (unsigned short*)((char*)tl+sizeof(u64));
2149 break;
2150 default:
2151 /* someone did something stupid. */
2152 ;
2153 }
2154 return tl;
2155}
2156
2157void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state state)
2158{
2159 char buffer[sizeof(struct cn_msg)+
2160 sizeof(struct drbd_nl_cfg_reply)+
2161 sizeof(struct get_state_tag_len_struct)+
2162 sizeof(short int)];
2163 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2164 struct drbd_nl_cfg_reply *reply =
2165 (struct drbd_nl_cfg_reply *)cn_reply->data;
2166 unsigned short *tl = reply->tag_list;
2167
2168 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2169
2170 tl = get_state_to_tags(mdev, (struct get_state *)&state, tl);
2171
2172 put_unaligned(TT_END, tl++); /* Close the tag list */
2173
2174 cn_reply->id.idx = CN_IDX_DRBD;
2175 cn_reply->id.val = CN_VAL_DRBD;
2176
2177 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2178 cn_reply->ack = 0; /* not used here. */
2179 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2180 (int)((char *)tl - (char *)reply->tag_list);
2181 cn_reply->flags = 0;
2182
2183 reply->packet_type = P_get_state;
2184 reply->minor = mdev_to_minor(mdev);
2185 reply->ret_code = NO_ERROR;
2186
b411b363
PR		 2187 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2188}
2189
2190void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name)
2191{
2192 char buffer[sizeof(struct cn_msg)+
2193 sizeof(struct drbd_nl_cfg_reply)+
2194 sizeof(struct call_helper_tag_len_struct)+
2195 sizeof(short int)];
2196 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2197 struct drbd_nl_cfg_reply *reply =
2198 (struct drbd_nl_cfg_reply *)cn_reply->data;
2199 unsigned short *tl = reply->tag_list;
2200
2201 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2202
2203 tl = tl_add_str(tl, T_helper, helper_name);
2204 put_unaligned(TT_END, tl++); /* Close the tag list */
2205
2206 cn_reply->id.idx = CN_IDX_DRBD;
2207 cn_reply->id.val = CN_VAL_DRBD;
2208
2209 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2210 cn_reply->ack = 0; /* not used here. */
2211 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2212 (int)((char *)tl - (char *)reply->tag_list);
2213 cn_reply->flags = 0;
2214
2215 reply->packet_type = P_call_helper;
2216 reply->minor = mdev_to_minor(mdev);
2217 reply->ret_code = NO_ERROR;
2218
b411b363
PR		 2219 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2220}
2221
2222void drbd_bcast_ee(struct drbd_conf *mdev,
2223 const char *reason, const int dgs,
2224 const char* seen_hash, const char* calc_hash,
2225 const struct drbd_epoch_entry* e)
2226{
2227 struct cn_msg *cn_reply;
2228 struct drbd_nl_cfg_reply *reply;
b411b363 2229 unsigned short *tl;
45bb912b
LE		 2230 struct page *page;
2231 unsigned len;
b411b363
PR		 2232
2233 if (!e)
2234 return;
2235 if (!reason || !reason[0])
2236 return;
2237
2238 /* apparently we have to memcpy twice, first to prepare the data for the
2239 * struct cn_msg, then within cn_netlink_send from the cn_msg to the
2240 * netlink skb. */
2241 /* receiver thread context, which is not in the writeout path (of this node),
2242 * but may be in the writeout path of the _other_ node.
2243 * GFP_NOIO to avoid potential "distributed deadlock". */
2244 cn_reply = kmalloc(
2245 sizeof(struct cn_msg)+
2246 sizeof(struct drbd_nl_cfg_reply)+
2247 sizeof(struct dump_ee_tag_len_struct)+
2248 sizeof(short int),
2249 GFP_NOIO);
2250
2251 if (!cn_reply) {
2252 dev_err(DEV, "could not kmalloc buffer for drbd_bcast_ee, sector %llu, size %u\n",
2253 (unsigned long long)e->sector, e->size);
2254 return;
2255 }
2256
2257 reply = (struct drbd_nl_cfg_reply*)cn_reply->data;
2258 tl = reply->tag_list;
2259
2260 tl = tl_add_str(tl, T_dump_ee_reason, reason);
2261 tl = tl_add_blob(tl, T_seen_digest, seen_hash, dgs);
2262 tl = tl_add_blob(tl, T_calc_digest, calc_hash, dgs);
2263 tl = tl_add_int(tl, T_ee_sector, &e->sector);
2264 tl = tl_add_int(tl, T_ee_block_id, &e->block_id);
2265
2266 put_unaligned(T_ee_data, tl++);
2267 put_unaligned(e->size, tl++);
2268
45bb912b
LE		 2269 len = e->size;
2270 page = e->pages;
2271 page_chain_for_each(page) {
2272 void *d = kmap_atomic(page, KM_USER0);
2273 unsigned l = min_t(unsigned, len, PAGE_SIZE);
2274 memcpy(tl, d, l);
2275 kunmap_atomic(d, KM_USER0);
2276 tl = (unsigned short*)((char*)tl + l);
2277 len -= l;
b411b363
PR		 2278 }
2279 put_unaligned(TT_END, tl++); /* Close the tag list */
2280
2281 cn_reply->id.idx = CN_IDX_DRBD;
2282 cn_reply->id.val = CN_VAL_DRBD;
2283
2284 cn_reply->seq = atomic_add_return(1,&drbd_nl_seq);
2285 cn_reply->ack = 0; // not used here.
2286 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2287 (int)((char*)tl - (char*)reply->tag_list);
2288 cn_reply->flags = 0;
2289
2290 reply->packet_type = P_dump_ee;
2291 reply->minor = mdev_to_minor(mdev);
2292 reply->ret_code = NO_ERROR;
2293
b411b363
PR		 2294 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2295 kfree(cn_reply);
2296}
2297
2298void drbd_bcast_sync_progress(struct drbd_conf *mdev)
2299{
2300 char buffer[sizeof(struct cn_msg)+
2301 sizeof(struct drbd_nl_cfg_reply)+
2302 sizeof(struct sync_progress_tag_len_struct)+
2303 sizeof(short int)];
2304 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2305 struct drbd_nl_cfg_reply *reply =
2306 (struct drbd_nl_cfg_reply *)cn_reply->data;
2307 unsigned short *tl = reply->tag_list;
2308 unsigned long rs_left;
2309 unsigned int res;
2310
2311 /* no local ref, no bitmap, no syncer progress, no broadcast. */
2312 if (!get_ldev(mdev))
2313 return;
2314 drbd_get_syncer_progress(mdev, &rs_left, &res);
2315 put_ldev(mdev);
2316
2317 tl = tl_add_int(tl, T_sync_progress, &res);
2318 put_unaligned(TT_END, tl++); /* Close the tag list */
2319
2320 cn_reply->id.idx = CN_IDX_DRBD;
2321 cn_reply->id.val = CN_VAL_DRBD;
2322
2323 cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
2324 cn_reply->ack = 0; /* not used here. */
2325 cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
2326 (int)((char *)tl - (char *)reply->tag_list);
2327 cn_reply->flags = 0;
2328
2329 reply->packet_type = P_sync_progress;
2330 reply->minor = mdev_to_minor(mdev);
2331 reply->ret_code = NO_ERROR;
2332
b411b363
PR		 2333 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2334}
2335
2336int __init drbd_nl_init(void)
2337{
2338 static struct cb_id cn_id_drbd;
2339 int err, try=10;
2340
2341 cn_id_drbd.val = CN_VAL_DRBD;
2342 do {
2343 cn_id_drbd.idx = cn_idx;
2344 err = cn_add_callback(&cn_id_drbd, "cn_drbd", &drbd_connector_callback);
2345 if (!err)
2346 break;
2347 cn_idx = (cn_idx + CN_IDX_STEP);
2348 } while (try--);
2349
2350 if (err) {
2351 printk(KERN_ERR "drbd: cn_drbd failed to register\n");
2352 return err;
2353 }
2354
2355 return 0;
2356}
2357
2358void drbd_nl_cleanup(void)
2359{
2360 static struct cb_id cn_id_drbd;
2361
2362 cn_id_drbd.idx = cn_idx;
2363 cn_id_drbd.val = CN_VAL_DRBD;
2364
2365 cn_del_callback(&cn_id_drbd);
2366}
2367
2368void drbd_nl_send_reply(struct cn_msg *req, int ret_code)
2369{
2370 char buffer[sizeof(struct cn_msg)+sizeof(struct drbd_nl_cfg_reply)];
2371 struct cn_msg *cn_reply = (struct cn_msg *) buffer;
2372 struct drbd_nl_cfg_reply *reply =
2373 (struct drbd_nl_cfg_reply *)cn_reply->data;
2374 int rr;
2375
2376 cn_reply->id = req->id;
2377
2378 cn_reply->seq = req->seq;
2379 cn_reply->ack = req->ack + 1;
2380 cn_reply->len = sizeof(struct drbd_nl_cfg_reply);
2381 cn_reply->flags = 0;
2382
2383 reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor;
2384 reply->ret_code = ret_code;
2385
b411b363
PR		 2386 rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2387 if (rr && rr != -ESRCH)
2388 printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
2389}
2390
Linux kernel - Deliverables
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