4 This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
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>.
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)
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.
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.
26 #include <linux/module.h>
27 #include <linux/drbd.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>
36 #include "drbd_wrappers.h"
37 #include <asm/unaligned.h>
38 #include <linux/drbd_tag_magic.h>
39 #include <linux/drbd_limits.h>
41 static unsigned short *tl_add_blob(unsigned short *, enum drbd_tags, const void *, int);
42 static unsigned short *tl_add_str(unsigned short *, enum drbd_tags, const char *);
43 static unsigned short *tl_add_int(unsigned short *, enum drbd_tags, const void *);
45 /* see get_sb_bdev and bd_claim */
46 static char *drbd_m_holder = "Hands off! this is DRBD's meta data device.";
48 /* Generate the tag_list to struct functions */
49 #define NL_PACKET(name, number, fields) \
50 static int name ## _from_tags(struct drbd_conf *mdev, \
51 unsigned short *tags, struct name *arg) __attribute__ ((unused)); \
52 static int name ## _from_tags(struct drbd_conf *mdev, \
53 unsigned short *tags, struct name *arg) \
58 while ((tag = get_unaligned(tags++)) != TT_END) { \
59 dlen = get_unaligned(tags++); \
60 switch (tag_number(tag)) { \
63 if (tag & T_MANDATORY) { \
64 dev_err(DEV, "Unknown tag: %d\n", tag_number(tag)); \
68 tags = (unsigned short *)((char *)tags + dlen); \
72 #define NL_INTEGER(pn, pr, member) \
73 case pn: /* D_ASSERT( tag_type(tag) == TT_INTEGER ); */ \
74 arg->member = get_unaligned((int *)(tags)); \
76 #define NL_INT64(pn, pr, member) \
77 case pn: /* D_ASSERT( tag_type(tag) == TT_INT64 ); */ \
78 arg->member = get_unaligned((u64 *)(tags)); \
80 #define NL_BIT(pn, pr, member) \
81 case pn: /* D_ASSERT( tag_type(tag) == TT_BIT ); */ \
82 arg->member = *(char *)(tags) ? 1 : 0; \
84 #define NL_STRING(pn, pr, member, len) \
85 case pn: /* D_ASSERT( tag_type(tag) == TT_STRING ); */ \
87 dev_err(DEV, "arg too long: %s (%u wanted, max len: %u bytes)\n", \
88 #member, dlen, (unsigned int)len); \
91 arg->member ## _len = dlen; \
92 memcpy(arg->member, tags, min_t(size_t, dlen, len)); \
94 #include "linux/drbd_nl.h"
96 /* Generate the struct to tag_list functions */
97 #define NL_PACKET(name, number, fields) \
98 static unsigned short* \
99 name ## _to_tags(struct drbd_conf *mdev, \
100 struct name *arg, unsigned short *tags) __attribute__ ((unused)); \
101 static unsigned short* \
102 name ## _to_tags(struct drbd_conf *mdev, \
103 struct name *arg, unsigned short *tags) \
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"
131 void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name);
132 void drbd_nl_send_reply(struct cn_msg *, int);
134 int drbd_khelper(struct drbd_conf *mdev, char *cmd)
136 char *envp[] = { "HOME=/",
138 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
139 NULL, /* Will be set to address family */
140 NULL, /* Will be set to address */
143 char mb[12], af[20], ad[60], *afs;
144 char *argv[] = {usermode_helper, cmd, mb, NULL };
147 snprintf(mb, 12, "minor-%d", mdev_to_minor(mdev));
149 if (get_net_conf(mdev)) {
150 switch (((struct sockaddr *)mdev->net_conf->peer_addr)->sa_family) {
153 snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI6",
154 &((struct sockaddr_in6 *)mdev->net_conf->peer_addr)->sin6_addr);
158 snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4",
159 &((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr);
163 snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4",
164 &((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr);
166 snprintf(af, 20, "DRBD_PEER_AF=%s", afs);
172 dev_info(DEV, "helper command: %s %s %s\n", usermode_helper, cmd, mb);
174 drbd_bcast_ev_helper(mdev, cmd);
175 ret = call_usermodehelper(usermode_helper, argv, envp, 1);
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);
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);
185 if (ret < 0) /* Ignore any ERRNOs we got. */
191 enum drbd_disk_state drbd_try_outdate_peer(struct drbd_conf *mdev)
195 enum drbd_disk_state nps;
196 enum drbd_fencing_p fp;
198 D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
200 if (get_ldev_if_state(mdev, D_CONSISTENT)) {
201 fp = mdev->ldev->dc.fencing;
204 dev_warn(DEV, "Not fencing peer, I'm not even Consistent myself.\n");
205 return mdev->state.pdsk;
208 if (fp == FP_STONITH)
209 _drbd_request_state(mdev, NS(susp, 1), CS_WAIT_COMPLETE);
211 r = drbd_khelper(mdev, "fence-peer");
213 switch ((r>>8) & 0xff) {
214 case 3: /* peer is inconsistent */
215 ex_to_string = "peer is inconsistent or worse";
216 nps = D_INCONSISTENT;
218 case 4: /* peer got outdated, or was already outdated */
219 ex_to_string = "peer was fenced";
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";
228 ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
229 nps = mdev->state.pdsk;
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");
238 _drbd_request_state(mdev, NS(disk, D_OUTDATED), CS_WAIT_COMPLETE);
241 if (fp != FP_STONITH)
242 dev_err(DEV, "fence-peer() = 7 && fencing != Stonith !!!\n");
243 ex_to_string = "peer was stonithed";
247 /* The script is broken ... */
249 dev_err(DEV, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
253 dev_info(DEV, "fence-peer helper returned %d (%s)\n",
254 (r>>8) & 0xff, ex_to_string);
259 int drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
261 const int max_tries = 4;
265 union drbd_state mask, val;
266 enum drbd_disk_state nps;
268 if (new_role == R_PRIMARY)
269 request_ping(mdev); /* Detect a dead peer ASAP */
271 mutex_lock(&mdev->state_mutex);
273 mask.i = 0; mask.role = R_MASK;
274 val.i = 0; val.role = new_role;
276 while (try++ < max_tries) {
277 r = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE);
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) {
287 if (r == SS_NO_UP_TO_DATE_DISK && force &&
288 (mdev->state.disk == D_INCONSISTENT ||
289 mdev->state.disk == D_OUTDATED)) {
291 val.disk = D_UP_TO_DATE;
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);
301 if (nps == D_OUTDATED || nps == D_INCONSISTENT) {
302 val.disk = D_UP_TO_DATE;
312 if (r == SS_NOTHING_TO_DO)
314 if (r == SS_PRIMARY_NOP && mask.pdsk == 0) {
315 nps = drbd_try_outdate_peer(mdev);
317 if (force && nps > D_OUTDATED) {
318 dev_warn(DEV, "Forced into split brain situation!\n");
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);
336 if (r < SS_SUCCESS) {
337 r = _drbd_request_state(mdev, mask, val,
338 CS_VERBOSE + CS_WAIT_COMPLETE);
349 dev_warn(DEV, "Forced to consider local data as UpToDate!\n");
351 /* Wait until nothing is on the fly :) */
352 wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0);
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;
361 if (get_net_conf(mdev)) {
362 mdev->net_conf->want_lose = 0;
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);
372 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
377 if ((new_role == R_SECONDARY) && get_ldev(mdev)) {
378 drbd_al_to_on_disk_bm(mdev);
382 if (mdev->state.conn >= C_WF_REPORT_PARAMS) {
383 /* if this was forced, we should consider sync */
385 drbd_send_uuids(mdev);
386 drbd_send_state(mdev);
391 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
393 mutex_unlock(&mdev->state_mutex);
398 static int drbd_nl_primary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
399 struct drbd_nl_cfg_reply *reply)
401 struct primary primary_args;
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;
410 drbd_set_role(mdev, R_PRIMARY, primary_args.overwrite_peer);
415 static int drbd_nl_secondary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
416 struct drbd_nl_cfg_reply *reply)
418 reply->ret_code = drbd_set_role(mdev, R_SECONDARY, 0);
423 /* initializes the md.*_offset members, so we are able to find
424 * the on disk meta data */
425 static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
426 struct drbd_backing_dev *bdev)
428 sector_t md_size_sect = 0;
429 switch (bdev->dc.meta_dev_idx) {
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;
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;
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);
455 /* plus the "drbd meta data super block",
456 * and the activity log; */
457 md_size_sect += MD_BM_OFFSET;
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;
466 char *ppsize(char *buf, unsigned long long size)
468 /* Needs 9 bytes at max. */
469 static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
471 while (size >= 10000) {
473 size = (size >> 10) + !!(size & (1<<9));
476 sprintf(buf, "%lu %cB", (long)size, units[base]);
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.
494 void drbd_suspend_io(struct drbd_conf *mdev)
496 set_bit(SUSPEND_IO, &mdev->flags);
497 wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
500 void drbd_resume_io(struct drbd_conf *mdev)
502 clear_bit(SUSPEND_IO, &mdev->flags);
503 wake_up(&mdev->misc_wait);
507 * drbd_determine_dev_size() - Sets the right device size obeying all constraints
508 * @mdev: DRBD device.
510 * Returns 0 on success, negative return values indicate errors.
511 * You should call drbd_md_sync() after calling this function.
513 enum determine_dev_size drbd_determin_dev_size(struct drbd_conf *mdev) __must_hold(local)
515 sector_t prev_first_sect, prev_size; /* previous meta location */
520 int md_moved, la_size_changed;
521 enum determine_dev_size rv = unchanged;
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.
529 * Suspend IO right here.
530 * still lock the act_log to not trigger ASSERTs there.
532 drbd_suspend_io(mdev);
534 /* no wait necessary anymore, actually we could assert that */
535 wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
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;
541 /* TODO: should only be some assert here, not (re)init... */
542 drbd_md_set_sector_offsets(mdev, mdev->ldev);
544 size = drbd_new_dev_size(mdev, mdev->ldev);
546 if (drbd_get_capacity(mdev->this_bdev) != size ||
547 drbd_bm_capacity(mdev) != size) {
549 err = drbd_bm_resize(mdev, size);
551 /* currently there is only one error: ENOMEM! */
552 size = drbd_bm_capacity(mdev)>>1;
554 dev_err(DEV, "OUT OF MEMORY! "
555 "Could not allocate bitmap!\n");
557 dev_err(DEV, "BM resizing failed. "
558 "Leaving size unchanged at size = %lu KB\n",
559 (unsigned long)size);
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);
569 if (rv == dev_size_error)
572 la_size_changed = (la_size != mdev->ldev->md.la_size_sect);
574 md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev)
575 || prev_size != mdev->ldev->md.md_size_sect;
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);
591 lc_unlock(mdev->act_log);
592 wake_up(&mdev->al_wait);
593 drbd_resume_io(mdev);
599 drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
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. */
607 m_size = drbd_get_max_capacity(bdev);
609 if (p_size && m_size) {
610 size = min_t(sector_t, p_size, m_size);
614 if (m_size && m_size < size)
616 if (p_size && p_size < size)
627 dev_err(DEV, "Both nodes diskless!\n");
631 dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n",
632 (unsigned long)u_size>>1, (unsigned long)size>>1);
641 * drbd_check_al_size() - Ensures that the AL is of the right size
642 * @mdev: DRBD device.
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
648 static int drbd_check_al_size(struct drbd_conf *mdev)
650 struct lru_cache *n, *t;
651 struct lc_element *e;
655 ERR_IF(mdev->sync_conf.al_extents < 7)
656 mdev->sync_conf.al_extents = 127;
659 mdev->act_log->nr_elements == mdev->sync_conf.al_extents)
664 n = lc_create("act_log", drbd_al_ext_cache,
665 mdev->sync_conf.al_extents, sizeof(struct lc_element), 0);
668 dev_err(DEV, "Cannot allocate act_log lru!\n");
671 spin_lock_irq(&mdev->al_lock);
673 for (i = 0; i < t->nr_elements; i++) {
674 e = lc_element_by_index(t, i);
676 dev_err(DEV, "refcnt(%d)==%d\n",
677 e->lc_number, e->refcnt);
683 spin_unlock_irq(&mdev->al_lock);
685 dev_err(DEV, "Activity log still in use!\n");
692 drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */
696 void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_seg_s) __must_hold(local)
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;
702 if (b->merge_bvec_fn && !mdev->ldev->dc.use_bmbv)
703 max_seg_s = PAGE_SIZE;
705 max_seg_s = min(queue_max_sectors(b) * queue_logical_block_size(b), max_seg_s);
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);
715 if (b->merge_bvec_fn)
716 dev_warn(DEV, "Backing device's merge_bvec_fn() = %p\n",
718 dev_info(DEV, "max_segment_size ( = BIO size ) = %u\n", queue_max_segment_size(q));
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;
728 /* serialize deconfig (worker exiting, doing cleanup)
729 * and reconfig (drbdsetup disk, drbdsetup net)
731 * wait for a potentially exiting worker, then restart it,
732 * or start a new one.
734 static void drbd_reconfig_start(struct drbd_conf *mdev)
736 wait_event(mdev->state_wait, !test_and_set_bit(CONFIG_PENDING, &mdev->flags));
737 wait_event(mdev->state_wait, !test_bit(DEVICE_DYING, &mdev->flags));
738 drbd_thread_start(&mdev->worker);
741 /* if still unconfigured, stops worker again.
742 * if configured now, clears CONFIG_PENDING.
743 * wakes potential waiters */
744 static void drbd_reconfig_done(struct drbd_conf *mdev)
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);
753 clear_bit(CONFIG_PENDING, &mdev->flags);
754 spin_unlock_irq(&mdev->req_lock);
755 wake_up(&mdev->state_wait);
758 /* does always return 0;
759 * interesting return code is in reply->ret_code */
760 static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
761 struct drbd_nl_cfg_reply *reply)
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;
772 int cp_discovered = 0;
773 int logical_block_size;
775 drbd_reconfig_start(mdev);
777 /* if you want to reconfigure, please tear down first */
778 if (mdev->state.disk > D_DISKLESS) {
779 retcode = ERR_DISK_CONFIGURED;
783 /* allocation not in the IO path, cqueue thread context */
784 nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
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;
795 if (!disk_conf_from_tags(mdev, nlp->tag_list, &nbc->dc)) {
796 retcode = ERR_MANDATORY_TAG;
800 if (nbc->dc.meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
801 retcode = ERR_MD_IDX_INVALID;
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));
810 retcode = ERR_OPEN_DISK;
814 inode = nbc->lo_file->f_dentry->d_inode;
816 if (!S_ISBLK(inode->i_mode)) {
817 retcode = ERR_DISK_NOT_BDEV;
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));
826 retcode = ERR_OPEN_MD_DISK;
830 inode2 = nbc->md_file->f_dentry->d_inode;
832 if (!S_ISBLK(inode2->i_mode)) {
833 retcode = ERR_MD_NOT_BDEV;
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;
848 resync_lru = lc_create("resync", drbd_bm_ext_cache,
849 61, sizeof(struct bm_extent),
850 offsetof(struct bm_extent, lce));
853 goto release_bdev_fail;
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;
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;
877 /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
878 drbd_md_set_sector_offsets(mdev, nbc);
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;
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);
893 max_possible_sectors = DRBD_MAX_SECTORS;
894 min_md_device_sectors = MD_RESERVED_SECT * (nbc->dc.meta_dev_idx + 1);
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;
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;
913 nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
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");
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);
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;
935 if (!get_ldev_if_state(mdev, D_ATTACHING))
938 drbd_md_set_sector_offsets(mdev, nbc);
941 if (drbd_bm_init(mdev)) {
943 goto force_diskless_dec;
947 retcode = drbd_md_read(mdev, nbc);
948 if (retcode != NO_ERROR)
949 goto force_diskless_dec;
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;
960 /* Since we are diskless, fix the activity log first... */
961 if (drbd_check_al_size(mdev)) {
963 goto force_diskless_dec;
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;
974 if (!drbd_al_read_log(mdev, nbc)) {
975 retcode = ERR_IO_MD_DISK;
976 goto force_diskless_dec;
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;
984 if (logical_block_size != MD_SECTOR_SIZE) {
985 if (!mdev->md_io_tmpp) {
986 struct page *page = alloc_page(GFP_NOIO);
988 goto force_diskless_dec;
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");
994 mdev->md_io_tmpp = page;
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);
1003 clear_bit(MD_NO_BARRIER, &mdev->flags);
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);
1011 mdev->resync = resync_lru;
1015 mdev->write_ordering = WO_bio_barrier;
1016 drbd_bump_write_ordering(mdev, WO_bio_barrier);
1018 if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
1019 set_bit(CRASHED_PRIMARY, &mdev->flags);
1021 clear_bit(CRASHED_PRIMARY, &mdev->flags);
1023 if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND)) {
1024 set_bit(CRASHED_PRIMARY, &mdev->flags);
1033 drbd_setup_queue_param(mdev, DRBD_MAX_SEGMENT_SIZE);
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.
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.
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.
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);
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);
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;
1070 if (drbd_bitmap_io(mdev, &drbd_bm_read, "read from attaching") < 0) {
1071 retcode = ERR_IO_MD_DISK;
1072 goto force_diskless_dec;
1076 if (cp_discovered) {
1077 drbd_al_apply_to_bm(mdev);
1078 drbd_al_to_on_disk_bm(mdev);
1081 spin_lock_irq(&mdev->req_lock);
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.
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;
1093 ns.disk = D_OUTDATED;
1095 ns.disk = D_INCONSISTENT;
1098 if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
1099 ns.pdsk = D_OUTDATED;
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;
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
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;
1115 ns.disk = D_NEGOTIATING;
1118 rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
1120 spin_unlock_irq(&mdev->req_lock);
1122 if (rv < SS_SUCCESS)
1123 goto force_diskless_dec;
1125 if (mdev->state.role == R_PRIMARY)
1126 mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
1128 mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
1130 drbd_md_mark_dirty(mdev);
1133 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1135 reply->ret_code = retcode;
1136 drbd_reconfig_done(mdev);
1142 drbd_force_state(mdev, NS(disk, D_DISKLESS));
1146 bd_release(nbc->md_bdev);
1149 bd_release(nbc->backing_bdev);
1158 lc_destroy(resync_lru);
1160 reply->ret_code = retcode;
1161 drbd_reconfig_done(mdev);
1165 static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1166 struct drbd_nl_cfg_reply *reply)
1168 reply->ret_code = drbd_request_state(mdev, NS(disk, D_DISKLESS));
1172 static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1173 struct drbd_nl_cfg_reply *reply)
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;
1190 drbd_reconfig_start(mdev);
1192 if (mdev->state.conn > C_STANDALONE) {
1193 retcode = ERR_NET_CONFIGURED;
1197 /* allocation not in the IO path, cqueue thread context */
1198 new_conf = kmalloc(sizeof(struct net_conf), GFP_KERNEL);
1200 retcode = ERR_NOMEM;
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;
1223 if (!net_conf_from_tags(mdev, nlp->tag_list, new_conf)) {
1224 retcode = ERR_MANDATORY_TAG;
1228 if (new_conf->two_primaries
1229 && (new_conf->wire_protocol != DRBD_PROT_C)) {
1230 retcode = ERR_NOT_PROTO_C;
1234 if (mdev->state.role == R_PRIMARY && new_conf->want_lose) {
1235 retcode = ERR_DISCARD;
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)
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;
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;
1259 if (retcode != NO_ERROR)
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);
1270 retcode = ERR_AUTH_ALG;
1274 if (crypto_tfm_alg_type(crypto_hash_tfm(tfm)) != CRYPTO_ALG_TYPE_SHASH) {
1275 retcode = ERR_AUTH_ALG_ND;
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;
1288 if (!drbd_crypto_is_hash(crypto_hash_tfm(integrity_w_tfm))) {
1289 retcode=ERR_INTEGRITY_ALG_ND;
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;
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);
1305 retcode = ERR_NOMEM;
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);
1314 retcode = ERR_NOMEM;
1319 ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
1321 if (integrity_w_tfm) {
1322 i = crypto_hash_digestsize(integrity_w_tfm);
1323 int_dig_out = kmalloc(i, GFP_KERNEL);
1325 retcode = ERR_NOMEM;
1328 int_dig_in = kmalloc(i, GFP_KERNEL);
1330 retcode = ERR_NOMEM;
1333 int_dig_vv = kmalloc(i, GFP_KERNEL);
1335 retcode = ERR_NOMEM;
1340 if (!mdev->bitmap) {
1341 if(drbd_bm_init(mdev)) {
1342 retcode = ERR_NOMEM;
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);
1353 mdev->net_conf = new_conf;
1359 kfree(mdev->tl_hash);
1360 mdev->tl_hash_s = mdev->net_conf->max_epoch_size/8;
1361 mdev->tl_hash = new_tl_hash;
1365 kfree(mdev->ee_hash);
1366 mdev->ee_hash_s = mdev->net_conf->max_buffers/8;
1367 mdev->ee_hash = new_ee_hash;
1370 crypto_free_hash(mdev->cram_hmac_tfm);
1371 mdev->cram_hmac_tfm = tfm;
1373 crypto_free_hash(mdev->integrity_w_tfm);
1374 mdev->integrity_w_tfm = integrity_w_tfm;
1376 crypto_free_hash(mdev->integrity_r_tfm);
1377 mdev->integrity_r_tfm = integrity_r_tfm;
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);
1387 retcode = _drbd_request_state(mdev, NS(conn, C_UNCONNECTED), CS_VERBOSE);
1389 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1390 reply->ret_code = retcode;
1391 drbd_reconfig_done(mdev);
1398 crypto_free_hash(tfm);
1399 crypto_free_hash(integrity_w_tfm);
1400 crypto_free_hash(integrity_r_tfm);
1405 reply->ret_code = retcode;
1406 drbd_reconfig_done(mdev);
1410 static int drbd_nl_disconnect(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1411 struct drbd_nl_cfg_reply *reply)
1415 retcode = _drbd_request_state(mdev, NS(conn, C_DISCONNECTING), CS_ORDERED);
1417 if (retcode == SS_NOTHING_TO_DO)
1419 else if (retcode == SS_ALREADY_STANDALONE)
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,
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,
1430 if (retcode == SS_IS_DISKLESS || retcode == SS_LOWER_THAN_OUTDATED) {
1431 drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
1432 retcode = SS_SUCCESS;
1436 if (retcode < SS_SUCCESS)
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! */
1451 reply->ret_code = retcode;
1455 void resync_after_online_grow(struct drbd_conf *mdev)
1457 int iass; /* I am sync source */
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);
1463 iass = test_bit(DISCARD_CONCURRENT, &mdev->flags);
1466 drbd_start_resync(mdev, C_SYNC_SOURCE);
1468 _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
1471 static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1472 struct drbd_nl_cfg_reply *reply)
1475 int retcode = NO_ERROR;
1476 int ldsc = 0; /* local disk size changed */
1477 enum determine_dev_size dd;
1479 memset(&rs, 0, sizeof(struct resize));
1480 if (!resize_from_tags(mdev, nlp->tag_list, &rs)) {
1481 retcode = ERR_MANDATORY_TAG;
1485 if (mdev->state.conn > C_CONNECTED) {
1486 retcode = ERR_RESIZE_RESYNC;
1490 if (mdev->state.role == R_SECONDARY &&
1491 mdev->state.peer == R_SECONDARY) {
1492 retcode = ERR_NO_PRIMARY;
1496 if (!get_ldev(mdev)) {
1497 retcode = ERR_NO_DISK;
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);
1506 mdev->ldev->dc.disk_size = (sector_t)rs.resize_size;
1507 dd = drbd_determin_dev_size(mdev);
1510 if (dd == dev_size_error) {
1511 retcode = ERR_NOMEM_BITMAP;
1515 if (mdev->state.conn == C_CONNECTED && (dd != unchanged || ldsc)) {
1517 set_bit(RESIZE_PENDING, &mdev->flags);
1519 drbd_send_uuids(mdev);
1520 drbd_send_sizes(mdev, 1);
1524 reply->ret_code = retcode;
1528 static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1529 struct drbd_nl_cfg_reply *reply)
1531 int retcode = NO_ERROR;
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;
1540 if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) {
1541 retcode = ERR_NOMEM;
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;
1551 memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf));
1553 if (!syncer_conf_from_tags(mdev, nlp->tag_list, &sc)) {
1554 retcode = ERR_MANDATORY_TAG;
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 );
1564 if (rsr && strcmp(sc.csums_alg, mdev->sync_conf.csums_alg)) {
1565 retcode = ERR_CSUMS_RESYNC_RUNNING;
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)) {
1573 retcode = ERR_CSUMS_ALG;
1577 if (!drbd_crypto_is_hash(crypto_hash_tfm(csums_tfm))) {
1578 retcode = ERR_CSUMS_ALG_ND;
1583 /* online verify running */
1584 ovr = (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T);
1587 if (strcmp(sc.verify_alg, mdev->sync_conf.verify_alg)) {
1588 retcode = ERR_VERIFY_RUNNING;
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)) {
1597 retcode = ERR_VERIFY_ALG;
1601 if (!drbd_crypto_is_hash(crypto_hash_tfm(verify_tfm))) {
1602 retcode = ERR_VERIFY_ALG_ND;
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);
1612 dev_warn(DEV, "__bitmap_parse() failed with %d\n", err);
1613 retcode = ERR_CPU_MASK_PARSE;
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;
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)
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;
1640 crypto_free_hash(mdev->csums_tfm);
1641 mdev->csums_tfm = csums_tfm;
1646 crypto_free_hash(mdev->verify_tfm);
1647 mdev->verify_tfm = verify_tfm;
1650 spin_unlock(&mdev->peer_seq_lock);
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);
1663 retcode = ERR_NOMEM;
1668 if (mdev->state.conn >= C_CONNECTED)
1669 drbd_send_sync_param(mdev, &sc);
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;
1679 kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
1681 free_cpumask_var(new_cpu_mask);
1682 crypto_free_hash(csums_tfm);
1683 crypto_free_hash(verify_tfm);
1684 reply->ret_code = retcode;
1688 static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1689 struct drbd_nl_cfg_reply *reply)
1693 retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
1695 if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
1696 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
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);
1704 if (retcode != SS_NEED_CONNECTION)
1707 retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
1710 reply->ret_code = retcode;
1714 static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1715 struct drbd_nl_cfg_reply *reply)
1718 reply->ret_code = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
1723 static int drbd_nl_pause_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1724 struct drbd_nl_cfg_reply *reply)
1726 int retcode = NO_ERROR;
1728 if (drbd_request_state(mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
1729 retcode = ERR_PAUSE_IS_SET;
1731 reply->ret_code = retcode;
1735 static int drbd_nl_resume_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1736 struct drbd_nl_cfg_reply *reply)
1738 int retcode = NO_ERROR;
1740 if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO)
1741 retcode = ERR_PAUSE_IS_CLEAR;
1743 reply->ret_code = retcode;
1747 static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1748 struct drbd_nl_cfg_reply *reply)
1750 reply->ret_code = drbd_request_state(mdev, NS(susp, 1));
1755 static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1756 struct drbd_nl_cfg_reply *reply)
1758 reply->ret_code = drbd_request_state(mdev, NS(susp, 0));
1762 static int drbd_nl_outdate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1763 struct drbd_nl_cfg_reply *reply)
1765 reply->ret_code = drbd_request_state(mdev, NS(disk, D_OUTDATED));
1769 static int drbd_nl_get_config(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1770 struct drbd_nl_cfg_reply *reply)
1774 tl = reply->tag_list;
1776 if (get_ldev(mdev)) {
1777 tl = disk_conf_to_tags(mdev, &mdev->ldev->dc, tl);
1781 if (get_net_conf(mdev)) {
1782 tl = net_conf_to_tags(mdev, mdev->net_conf, tl);
1785 tl = syncer_conf_to_tags(mdev, &mdev->sync_conf, tl);
1787 put_unaligned(TT_END, tl++); /* Close the tag list */
1789 return (int)((char *)tl - (char *)reply->tag_list);
1792 static int drbd_nl_get_state(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1793 struct drbd_nl_cfg_reply *reply)
1795 unsigned short *tl = reply->tag_list;
1796 union drbd_state s = mdev->state;
1797 unsigned long rs_left;
1800 tl = get_state_to_tags(mdev, (struct get_state *)&s, tl);
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);
1810 put_unaligned(TT_END, tl++); /* Close the tag list */
1812 return (int)((char *)tl - (char *)reply->tag_list);
1815 static int drbd_nl_get_uuids(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1816 struct drbd_nl_cfg_reply *reply)
1820 tl = reply->tag_list;
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);
1827 put_unaligned(TT_END, tl++); /* Close the tag list */
1829 return (int)((char *)tl - (char *)reply->tag_list);
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
1838 static int drbd_nl_get_timeout_flag(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1839 struct drbd_nl_cfg_reply *reply)
1844 tl = reply->tag_list;
1846 rv = mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
1847 test_bit(USE_DEGR_WFC_T, &mdev->flags) ? UT_DEGRADED : UT_DEFAULT;
1849 tl = tl_add_blob(tl, T_use_degraded, &rv, sizeof(rv));
1850 put_unaligned(TT_END, tl++); /* Close the tag list */
1852 return (int)((char *)tl - (char *)reply->tag_list);
1855 static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1856 struct drbd_nl_cfg_reply *reply)
1858 /* default to resume from last known position, if possible */
1859 struct start_ov args =
1860 { .start_sector = mdev->ov_start_sector };
1862 if (!start_ov_from_tags(mdev, nlp->tag_list, &args)) {
1863 reply->ret_code = ERR_MANDATORY_TAG;
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));
1873 static int drbd_nl_new_c_uuid(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
1874 struct drbd_nl_cfg_reply *reply)
1876 int retcode = NO_ERROR;
1877 int skip_initial_sync = 0;
1880 struct new_c_uuid args;
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;
1888 mutex_lock(&mdev->state_mutex); /* Protects us against serialized state changes. */
1890 if (!get_ldev(mdev)) {
1891 retcode = ERR_NO_DISK;
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;
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 */
1908 if (args.clear_bm) {
1909 err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, "clear_n_write from new_c_uuid");
1911 dev_err(DEV, "Writing bitmap failed with %d\n",err);
1912 retcode = ERR_IO_MD_DISK;
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),
1920 spin_unlock_irq(&mdev->req_lock);
1928 mutex_unlock(&mdev->state_mutex);
1930 reply->ret_code = retcode;
1934 static struct drbd_conf *ensure_mdev(struct drbd_nl_cfg_req *nlp)
1936 struct drbd_conf *mdev;
1938 if (nlp->drbd_minor >= minor_count)
1941 mdev = minor_to_mdev(nlp->drbd_minor);
1943 if (!mdev && (nlp->flags & DRBD_NL_CREATE_DEVICE)) {
1944 struct gendisk *disk = NULL;
1945 mdev = drbd_new_device(nlp->drbd_minor);
1947 spin_lock_irq(&drbd_pp_lock);
1948 if (minor_table[nlp->drbd_minor] == NULL) {
1949 minor_table[nlp->drbd_minor] = mdev;
1952 } /* else: we lost the race */
1953 spin_unlock_irq(&drbd_pp_lock);
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! */
1959 else /* we lost the race above */
1960 drbd_free_mdev(mdev);
1962 mdev = minor_to_mdev(nlp->drbd_minor);
1968 struct 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;
1975 static 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 },
2006 static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp)
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;
2014 int reply_size = sizeof(struct cn_msg)
2015 + sizeof(struct drbd_nl_cfg_reply)
2016 + sizeof(short int);
2018 if (!try_module_get(THIS_MODULE)) {
2019 printk(KERN_ERR "drbd: try_module_get() failed!\n");
2023 if (!cap_raised(nsp->eff_cap, CAP_SYS_ADMIN)) {
2028 mdev = ensure_mdev(nlp);
2030 retcode = ERR_MINOR_INVALID;
2034 if (nlp->packet_type >= P_nl_after_last_packet) {
2035 retcode = ERR_PACKET_NR;
2039 cm = cnd_table + nlp->packet_type;
2041 /* This may happen if packet number is 0: */
2042 if (cm->function == NULL) {
2043 retcode = ERR_PACKET_NR;
2047 reply_size += cm->reply_body_size;
2049 /* allocation not in the IO path, cqueue thread context */
2050 cn_reply = kmalloc(reply_size, GFP_KERNEL);
2052 retcode = ERR_NOMEM;
2055 reply = (struct drbd_nl_cfg_reply *) cn_reply->data;
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. */
2063 rr = cm->function(mdev, nlp, reply);
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;
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);
2076 module_put(THIS_MODULE);
2079 drbd_nl_send_reply(req, retcode);
2080 module_put(THIS_MODULE);
2083 static atomic_t drbd_nl_seq = ATOMIC_INIT(2); /* two. */
2085 static unsigned short *
2086 __tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data,
2087 unsigned short len, int nul_terminated)
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);
2096 *((char*)tl - 1) = 0;
2100 static unsigned short *
2101 tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, int len)
2103 return __tl_add_blob(tl, tag, data, len, 0);
2106 static unsigned short *
2107 tl_add_str(unsigned short *tl, enum drbd_tags tag, const char *str)
2109 return __tl_add_blob(tl, tag, str, strlen(str)+1, 0);
2112 static unsigned short *
2113 tl_add_int(unsigned short *tl, enum drbd_tags tag, const void *val)
2115 put_unaligned(tag, tl++);
2116 switch(tag_type(tag)) {
2118 put_unaligned(sizeof(int), tl++);
2119 put_unaligned(*(int *)val, (int *)tl);
2120 tl = (unsigned short*)((char*)tl+sizeof(int));
2123 put_unaligned(sizeof(u64), tl++);
2124 put_unaligned(*(u64 *)val, (u64 *)tl);
2125 tl = (unsigned short*)((char*)tl+sizeof(u64));
2128 /* someone did something stupid. */
2134 void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state state)
2136 char buffer[sizeof(struct cn_msg)+
2137 sizeof(struct drbd_nl_cfg_reply)+
2138 sizeof(struct get_state_tag_len_struct)+
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;
2145 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2147 tl = get_state_to_tags(mdev, (struct get_state *)&state, tl);
2149 put_unaligned(TT_END, tl++); /* Close the tag list */
2151 cn_reply->id.idx = CN_IDX_DRBD;
2152 cn_reply->id.val = CN_VAL_DRBD;
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;
2160 reply->packet_type = P_get_state;
2161 reply->minor = mdev_to_minor(mdev);
2162 reply->ret_code = NO_ERROR;
2164 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2167 void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name)
2169 char buffer[sizeof(struct cn_msg)+
2170 sizeof(struct drbd_nl_cfg_reply)+
2171 sizeof(struct call_helper_tag_len_struct)+
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;
2178 /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
2180 tl = tl_add_str(tl, T_helper, helper_name);
2181 put_unaligned(TT_END, tl++); /* Close the tag list */
2183 cn_reply->id.idx = CN_IDX_DRBD;
2184 cn_reply->id.val = CN_VAL_DRBD;
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;
2192 reply->packet_type = P_call_helper;
2193 reply->minor = mdev_to_minor(mdev);
2194 reply->ret_code = NO_ERROR;
2196 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2199 void 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)
2204 struct cn_msg *cn_reply;
2205 struct drbd_nl_cfg_reply *reply;
2206 struct bio_vec *bvec;
2212 if (!reason || !reason[0])
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
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". */
2222 sizeof(struct cn_msg)+
2223 sizeof(struct drbd_nl_cfg_reply)+
2224 sizeof(struct dump_ee_tag_len_struct)+
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);
2234 reply = (struct drbd_nl_cfg_reply*)cn_reply->data;
2235 tl = reply->tag_list;
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);
2243 put_unaligned(T_ee_data, tl++);
2244 put_unaligned(e->size, tl++);
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);
2252 put_unaligned(TT_END, tl++); /* Close the tag list */
2254 cn_reply->id.idx = CN_IDX_DRBD;
2255 cn_reply->id.val = CN_VAL_DRBD;
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;
2263 reply->packet_type = P_dump_ee;
2264 reply->minor = mdev_to_minor(mdev);
2265 reply->ret_code = NO_ERROR;
2267 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2271 void drbd_bcast_sync_progress(struct drbd_conf *mdev)
2273 char buffer[sizeof(struct cn_msg)+
2274 sizeof(struct drbd_nl_cfg_reply)+
2275 sizeof(struct sync_progress_tag_len_struct)+
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;
2284 /* no local ref, no bitmap, no syncer progress, no broadcast. */
2285 if (!get_ldev(mdev))
2287 drbd_get_syncer_progress(mdev, &rs_left, &res);
2290 tl = tl_add_int(tl, T_sync_progress, &res);
2291 put_unaligned(TT_END, tl++); /* Close the tag list */
2293 cn_reply->id.idx = CN_IDX_DRBD;
2294 cn_reply->id.val = CN_VAL_DRBD;
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;
2302 reply->packet_type = P_sync_progress;
2303 reply->minor = mdev_to_minor(mdev);
2304 reply->ret_code = NO_ERROR;
2306 cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
2309 int __init drbd_nl_init(void)
2311 static struct cb_id cn_id_drbd;
2314 cn_id_drbd.val = CN_VAL_DRBD;
2316 cn_id_drbd.idx = cn_idx;
2317 err = cn_add_callback(&cn_id_drbd, "cn_drbd", &drbd_connector_callback);
2320 cn_idx = (cn_idx + CN_IDX_STEP);
2324 printk(KERN_ERR "drbd: cn_drbd failed to register\n");
2331 void drbd_nl_cleanup(void)
2333 static struct cb_id cn_id_drbd;
2335 cn_id_drbd.idx = cn_idx;
2336 cn_id_drbd.val = CN_VAL_DRBD;
2338 cn_del_callback(&cn_id_drbd);
2341 void drbd_nl_send_reply(struct cn_msg *req, int ret_code)
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;
2349 cn_reply->id = req->id;
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;
2356 reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor;
2357 reply->ret_code = ret_code;
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);