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b411b363 PR |
1 | /* |
2 | drbd_nl.c | |
3 | ||
4 | This file is part of DRBD by Philipp Reisner and Lars Ellenberg. | |
5 | ||
6 | Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. | |
7 | Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>. | |
8 | Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. | |
9 | ||
10 | drbd is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 2, or (at your option) | |
13 | any later version. | |
14 | ||
15 | drbd is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
21 | along with drbd; see the file COPYING. If not, write to | |
22 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
23 | ||
24 | */ | |
25 | ||
b411b363 PR |
26 | #include <linux/module.h> |
27 | #include <linux/drbd.h> | |
28 | #include <linux/in.h> | |
29 | #include <linux/fs.h> | |
30 | #include <linux/file.h> | |
31 | #include <linux/slab.h> | |
32 | #include <linux/connector.h> | |
33 | #include <linux/blkpg.h> | |
34 | #include <linux/cpumask.h> | |
35 | #include "drbd_int.h" | |
b411b363 PR |
36 | #include "drbd_wrappers.h" |
37 | #include <asm/unaligned.h> | |
38 | #include <linux/drbd_tag_magic.h> | |
39 | #include <linux/drbd_limits.h> | |
40 | ||
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 *); | |
44 | ||
45 | /* see get_sb_bdev and bd_claim */ | |
46 | static char *drbd_m_holder = "Hands off! this is DRBD's meta data device."; | |
47 | ||
48 | /* Generate the tag_list to struct functions */ | |
49 | #define NL_PACKET(name, number, fields) \ | |
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) \ | |
54 | { \ | |
55 | int tag; \ | |
56 | int dlen; \ | |
57 | \ | |
58 | while ((tag = get_unaligned(tags++)) != TT_END) { \ | |
59 | dlen = get_unaligned(tags++); \ | |
60 | switch (tag_number(tag)) { \ | |
61 | fields \ | |
62 | default: \ | |
63 | if (tag & T_MANDATORY) { \ | |
64 | dev_err(DEV, "Unknown tag: %d\n", tag_number(tag)); \ | |
65 | return 0; \ | |
66 | } \ | |
67 | } \ | |
68 | tags = (unsigned short *)((char *)tags + dlen); \ | |
69 | } \ | |
70 | return 1; \ | |
71 | } | |
72 | #define NL_INTEGER(pn, pr, member) \ | |
73 | case pn: /* D_ASSERT( tag_type(tag) == TT_INTEGER ); */ \ | |
74 | arg->member = get_unaligned((int *)(tags)); \ | |
75 | break; | |
76 | #define NL_INT64(pn, pr, member) \ | |
77 | case pn: /* D_ASSERT( tag_type(tag) == TT_INT64 ); */ \ | |
78 | arg->member = get_unaligned((u64 *)(tags)); \ | |
79 | break; | |
80 | #define NL_BIT(pn, pr, member) \ | |
81 | case pn: /* D_ASSERT( tag_type(tag) == TT_BIT ); */ \ | |
82 | arg->member = *(char *)(tags) ? 1 : 0; \ | |
83 | break; | |
84 | #define NL_STRING(pn, pr, member, len) \ | |
85 | case pn: /* D_ASSERT( tag_type(tag) == TT_STRING ); */ \ | |
86 | if (dlen > len) { \ | |
87 | dev_err(DEV, "arg too long: %s (%u wanted, max len: %u bytes)\n", \ | |
88 | #member, dlen, (unsigned int)len); \ | |
89 | return 0; \ | |
90 | } \ | |
91 | arg->member ## _len = dlen; \ | |
92 | memcpy(arg->member, tags, min_t(size_t, dlen, len)); \ | |
93 | break; | |
94 | #include "linux/drbd_nl.h" | |
95 | ||
96 | /* Generate the struct to tag_list functions */ | |
97 | #define NL_PACKET(name, number, fields) \ | |
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) \ | |
104 | { \ | |
105 | fields \ | |
106 | return tags; \ | |
107 | } | |
108 | ||
109 | #define NL_INTEGER(pn, pr, member) \ | |
110 | put_unaligned(pn | pr | TT_INTEGER, tags++); \ | |
111 | put_unaligned(sizeof(int), tags++); \ | |
112 | put_unaligned(arg->member, (int *)tags); \ | |
113 | tags = (unsigned short *)((char *)tags+sizeof(int)); | |
114 | #define NL_INT64(pn, pr, member) \ | |
115 | put_unaligned(pn | pr | TT_INT64, tags++); \ | |
116 | put_unaligned(sizeof(u64), tags++); \ | |
117 | put_unaligned(arg->member, (u64 *)tags); \ | |
118 | tags = (unsigned short *)((char *)tags+sizeof(u64)); | |
119 | #define NL_BIT(pn, pr, member) \ | |
120 | put_unaligned(pn | pr | TT_BIT, tags++); \ | |
121 | put_unaligned(sizeof(char), tags++); \ | |
122 | *(char *)tags = arg->member; \ | |
123 | tags = (unsigned short *)((char *)tags+sizeof(char)); | |
124 | #define NL_STRING(pn, pr, member, len) \ | |
125 | put_unaligned(pn | pr | TT_STRING, tags++); \ | |
126 | put_unaligned(arg->member ## _len, tags++); \ | |
127 | memcpy(tags, arg->member, arg->member ## _len); \ | |
128 | tags = (unsigned short *)((char *)tags + arg->member ## _len); | |
129 | #include "linux/drbd_nl.h" | |
130 | ||
131 | void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name); | |
132 | void drbd_nl_send_reply(struct cn_msg *, int); | |
133 | ||
134 | int drbd_khelper(struct drbd_conf *mdev, char *cmd) | |
135 | { | |
136 | char *envp[] = { "HOME=/", | |
137 | "TERM=linux", | |
138 | "PATH=/sbin:/usr/sbin:/bin:/usr/bin", | |
139 | NULL, /* Will be set to address family */ | |
140 | NULL, /* Will be set to address */ | |
141 | NULL }; | |
142 | ||
143 | char mb[12], af[20], ad[60], *afs; | |
144 | char *argv[] = {usermode_helper, cmd, mb, NULL }; | |
145 | int ret; | |
146 | ||
147 | snprintf(mb, 12, "minor-%d", mdev_to_minor(mdev)); | |
148 | ||
149 | if (get_net_conf(mdev)) { | |
150 | switch (((struct sockaddr *)mdev->net_conf->peer_addr)->sa_family) { | |
151 | case AF_INET6: | |
152 | afs = "ipv6"; | |
153 | snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI6", | |
154 | &((struct sockaddr_in6 *)mdev->net_conf->peer_addr)->sin6_addr); | |
155 | break; | |
156 | case AF_INET: | |
157 | afs = "ipv4"; | |
158 | snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4", | |
159 | &((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr); | |
160 | break; | |
161 | default: | |
162 | afs = "ssocks"; | |
163 | snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4", | |
164 | &((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr); | |
165 | } | |
166 | snprintf(af, 20, "DRBD_PEER_AF=%s", afs); | |
167 | envp[3]=af; | |
168 | envp[4]=ad; | |
169 | put_net_conf(mdev); | |
170 | } | |
171 | ||
172 | dev_info(DEV, "helper command: %s %s %s\n", usermode_helper, cmd, mb); | |
173 | ||
174 | drbd_bcast_ev_helper(mdev, cmd); | |
175 | ret = call_usermodehelper(usermode_helper, argv, envp, 1); | |
176 | if (ret) | |
177 | dev_warn(DEV, "helper command: %s %s %s exit code %u (0x%x)\n", | |
178 | usermode_helper, cmd, mb, | |
179 | (ret >> 8) & 0xff, ret); | |
180 | else | |
181 | dev_info(DEV, "helper command: %s %s %s exit code %u (0x%x)\n", | |
182 | usermode_helper, cmd, mb, | |
183 | (ret >> 8) & 0xff, ret); | |
184 | ||
185 | if (ret < 0) /* Ignore any ERRNOs we got. */ | |
186 | ret = 0; | |
187 | ||
188 | return ret; | |
189 | } | |
190 | ||
191 | enum drbd_disk_state drbd_try_outdate_peer(struct drbd_conf *mdev) | |
192 | { | |
193 | char *ex_to_string; | |
194 | int r; | |
195 | enum drbd_disk_state nps; | |
196 | enum drbd_fencing_p fp; | |
197 | ||
198 | D_ASSERT(mdev->state.pdsk == D_UNKNOWN); | |
199 | ||
200 | if (get_ldev_if_state(mdev, D_CONSISTENT)) { | |
201 | fp = mdev->ldev->dc.fencing; | |
202 | put_ldev(mdev); | |
203 | } else { | |
204 | dev_warn(DEV, "Not fencing peer, I'm not even Consistent myself.\n"); | |
205 | return mdev->state.pdsk; | |
206 | } | |
207 | ||
208 | if (fp == FP_STONITH) | |
209 | _drbd_request_state(mdev, NS(susp, 1), CS_WAIT_COMPLETE); | |
210 | ||
211 | r = drbd_khelper(mdev, "fence-peer"); | |
212 | ||
213 | switch ((r>>8) & 0xff) { | |
214 | case 3: /* peer is inconsistent */ | |
215 | ex_to_string = "peer is inconsistent or worse"; | |
216 | nps = D_INCONSISTENT; | |
217 | break; | |
218 | case 4: /* peer got outdated, or was already outdated */ | |
219 | ex_to_string = "peer was fenced"; | |
220 | nps = D_OUTDATED; | |
221 | break; | |
222 | case 5: /* peer was down */ | |
223 | if (mdev->state.disk == D_UP_TO_DATE) { | |
224 | /* we will(have) create(d) a new UUID anyways... */ | |
225 | ex_to_string = "peer is unreachable, assumed to be dead"; | |
226 | nps = D_OUTDATED; | |
227 | } else { | |
228 | ex_to_string = "peer unreachable, doing nothing since disk != UpToDate"; | |
229 | nps = mdev->state.pdsk; | |
230 | } | |
231 | break; | |
232 | case 6: /* Peer is primary, voluntarily outdate myself. | |
233 | * This is useful when an unconnected R_SECONDARY is asked to | |
234 | * become R_PRIMARY, but finds the other peer being active. */ | |
235 | ex_to_string = "peer is active"; | |
236 | dev_warn(DEV, "Peer is primary, outdating myself.\n"); | |
237 | nps = D_UNKNOWN; | |
238 | _drbd_request_state(mdev, NS(disk, D_OUTDATED), CS_WAIT_COMPLETE); | |
239 | break; | |
240 | case 7: | |
241 | if (fp != FP_STONITH) | |
242 | dev_err(DEV, "fence-peer() = 7 && fencing != Stonith !!!\n"); | |
243 | ex_to_string = "peer was stonithed"; | |
244 | nps = D_OUTDATED; | |
245 | break; | |
246 | default: | |
247 | /* The script is broken ... */ | |
248 | nps = D_UNKNOWN; | |
249 | dev_err(DEV, "fence-peer helper broken, returned %d\n", (r>>8)&0xff); | |
250 | return nps; | |
251 | } | |
252 | ||
253 | dev_info(DEV, "fence-peer helper returned %d (%s)\n", | |
254 | (r>>8) & 0xff, ex_to_string); | |
255 | return nps; | |
256 | } | |
257 | ||
258 | ||
259 | int drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force) | |
260 | { | |
261 | const int max_tries = 4; | |
262 | int r = 0; | |
263 | int try = 0; | |
264 | int forced = 0; | |
265 | union drbd_state mask, val; | |
266 | enum drbd_disk_state nps; | |
267 | ||
268 | if (new_role == R_PRIMARY) | |
269 | request_ping(mdev); /* Detect a dead peer ASAP */ | |
270 | ||
271 | mutex_lock(&mdev->state_mutex); | |
272 | ||
273 | mask.i = 0; mask.role = R_MASK; | |
274 | val.i = 0; val.role = new_role; | |
275 | ||
276 | while (try++ < max_tries) { | |
277 | r = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE); | |
278 | ||
279 | /* in case we first succeeded to outdate, | |
280 | * but now suddenly could establish a connection */ | |
281 | if (r == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) { | |
282 | val.pdsk = 0; | |
283 | mask.pdsk = 0; | |
284 | continue; | |
285 | } | |
286 | ||
287 | if (r == SS_NO_UP_TO_DATE_DISK && force && | |
288 | (mdev->state.disk == D_INCONSISTENT || | |
289 | mdev->state.disk == D_OUTDATED)) { | |
290 | mask.disk = D_MASK; | |
291 | val.disk = D_UP_TO_DATE; | |
292 | forced = 1; | |
293 | continue; | |
294 | } | |
295 | ||
296 | if (r == SS_NO_UP_TO_DATE_DISK && | |
297 | mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) { | |
298 | D_ASSERT(mdev->state.pdsk == D_UNKNOWN); | |
299 | nps = drbd_try_outdate_peer(mdev); | |
300 | ||
301 | if (nps == D_OUTDATED || nps == D_INCONSISTENT) { | |
302 | val.disk = D_UP_TO_DATE; | |
303 | mask.disk = D_MASK; | |
304 | } | |
305 | ||
306 | val.pdsk = nps; | |
307 | mask.pdsk = D_MASK; | |
308 | ||
309 | continue; | |
310 | } | |
311 | ||
312 | if (r == SS_NOTHING_TO_DO) | |
313 | goto fail; | |
314 | if (r == SS_PRIMARY_NOP && mask.pdsk == 0) { | |
315 | nps = drbd_try_outdate_peer(mdev); | |
316 | ||
317 | if (force && nps > D_OUTDATED) { | |
318 | dev_warn(DEV, "Forced into split brain situation!\n"); | |
319 | nps = D_OUTDATED; | |
320 | } | |
321 | ||
322 | mask.pdsk = D_MASK; | |
323 | val.pdsk = nps; | |
324 | ||
325 | continue; | |
326 | } | |
327 | if (r == SS_TWO_PRIMARIES) { | |
328 | /* Maybe the peer is detected as dead very soon... | |
329 | retry at most once more in this case. */ | |
330 | __set_current_state(TASK_INTERRUPTIBLE); | |
331 | schedule_timeout((mdev->net_conf->ping_timeo+1)*HZ/10); | |
332 | if (try < max_tries) | |
333 | try = max_tries - 1; | |
334 | continue; | |
335 | } | |
336 | if (r < SS_SUCCESS) { | |
337 | r = _drbd_request_state(mdev, mask, val, | |
338 | CS_VERBOSE + CS_WAIT_COMPLETE); | |
339 | if (r < SS_SUCCESS) | |
340 | goto fail; | |
341 | } | |
342 | break; | |
343 | } | |
344 | ||
345 | if (r < SS_SUCCESS) | |
346 | goto fail; | |
347 | ||
348 | if (forced) | |
349 | dev_warn(DEV, "Forced to consider local data as UpToDate!\n"); | |
350 | ||
351 | /* Wait until nothing is on the fly :) */ | |
352 | wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0); | |
353 | ||
354 | if (new_role == R_SECONDARY) { | |
355 | set_disk_ro(mdev->vdisk, TRUE); | |
356 | if (get_ldev(mdev)) { | |
357 | mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1; | |
358 | put_ldev(mdev); | |
359 | } | |
360 | } else { | |
361 | if (get_net_conf(mdev)) { | |
362 | mdev->net_conf->want_lose = 0; | |
363 | put_net_conf(mdev); | |
364 | } | |
365 | set_disk_ro(mdev->vdisk, FALSE); | |
366 | if (get_ldev(mdev)) { | |
367 | if (((mdev->state.conn < C_CONNECTED || | |
368 | mdev->state.pdsk <= D_FAILED) | |
369 | && mdev->ldev->md.uuid[UI_BITMAP] == 0) || forced) | |
370 | drbd_uuid_new_current(mdev); | |
371 | ||
372 | mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1; | |
373 | put_ldev(mdev); | |
374 | } | |
375 | } | |
376 | ||
377 | if ((new_role == R_SECONDARY) && get_ldev(mdev)) { | |
378 | drbd_al_to_on_disk_bm(mdev); | |
379 | put_ldev(mdev); | |
380 | } | |
381 | ||
382 | if (mdev->state.conn >= C_WF_REPORT_PARAMS) { | |
383 | /* if this was forced, we should consider sync */ | |
384 | if (forced) | |
385 | drbd_send_uuids(mdev); | |
386 | drbd_send_state(mdev); | |
387 | } | |
388 | ||
389 | drbd_md_sync(mdev); | |
390 | ||
391 | kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); | |
392 | fail: | |
393 | mutex_unlock(&mdev->state_mutex); | |
394 | return r; | |
395 | } | |
396 | ||
397 | ||
398 | static int drbd_nl_primary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, | |
399 | struct drbd_nl_cfg_reply *reply) | |
400 | { | |
401 | struct primary primary_args; | |
402 | ||
403 | memset(&primary_args, 0, sizeof(struct primary)); | |
404 | if (!primary_from_tags(mdev, nlp->tag_list, &primary_args)) { | |
405 | reply->ret_code = ERR_MANDATORY_TAG; | |
406 | return 0; | |
407 | } | |
408 | ||
409 | reply->ret_code = | |
410 | drbd_set_role(mdev, R_PRIMARY, primary_args.overwrite_peer); | |
411 | ||
412 | return 0; | |
413 | } | |
414 | ||
415 | static int drbd_nl_secondary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, | |
416 | struct drbd_nl_cfg_reply *reply) | |
417 | { | |
418 | reply->ret_code = drbd_set_role(mdev, R_SECONDARY, 0); | |
419 | ||
420 | return 0; | |
421 | } | |
422 | ||
423 | /* initializes the md.*_offset members, so we are able to find | |
424 | * the on disk meta data */ | |
425 | static void drbd_md_set_sector_offsets(struct drbd_conf *mdev, | |
426 | struct drbd_backing_dev *bdev) | |
427 | { | |
428 | sector_t md_size_sect = 0; | |
429 | switch (bdev->dc.meta_dev_idx) { | |
430 | default: | |
431 | /* v07 style fixed size indexed meta data */ | |
432 | bdev->md.md_size_sect = MD_RESERVED_SECT; | |
433 | bdev->md.md_offset = drbd_md_ss__(mdev, bdev); | |
434 | bdev->md.al_offset = MD_AL_OFFSET; | |
435 | bdev->md.bm_offset = MD_BM_OFFSET; | |
436 | break; | |
437 | case DRBD_MD_INDEX_FLEX_EXT: | |
438 | /* just occupy the full device; unit: sectors */ | |
439 | bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev); | |
440 | bdev->md.md_offset = 0; | |
441 | bdev->md.al_offset = MD_AL_OFFSET; | |
442 | bdev->md.bm_offset = MD_BM_OFFSET; | |
443 | break; | |
444 | case DRBD_MD_INDEX_INTERNAL: | |
445 | case DRBD_MD_INDEX_FLEX_INT: | |
446 | bdev->md.md_offset = drbd_md_ss__(mdev, bdev); | |
447 | /* al size is still fixed */ | |
448 | bdev->md.al_offset = -MD_AL_MAX_SIZE; | |
449 | /* we need (slightly less than) ~ this much bitmap sectors: */ | |
450 | md_size_sect = drbd_get_capacity(bdev->backing_bdev); | |
451 | md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT); | |
452 | md_size_sect = BM_SECT_TO_EXT(md_size_sect); | |
453 | md_size_sect = ALIGN(md_size_sect, 8); | |
454 | ||
455 | /* plus the "drbd meta data super block", | |
456 | * and the activity log; */ | |
457 | md_size_sect += MD_BM_OFFSET; | |
458 | ||
459 | bdev->md.md_size_sect = md_size_sect; | |
460 | /* bitmap offset is adjusted by 'super' block size */ | |
461 | bdev->md.bm_offset = -md_size_sect + MD_AL_OFFSET; | |
462 | break; | |
463 | } | |
464 | } | |
465 | ||
466 | char *ppsize(char *buf, unsigned long long size) | |
467 | { | |
468 | /* Needs 9 bytes at max. */ | |
469 | static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' }; | |
470 | int base = 0; | |
471 | while (size >= 10000) { | |
472 | /* shift + round */ | |
473 | size = (size >> 10) + !!(size & (1<<9)); | |
474 | base++; | |
475 | } | |
476 | sprintf(buf, "%lu %cB", (long)size, units[base]); | |
477 | ||
478 | return buf; | |
479 | } | |
480 | ||
481 | /* there is still a theoretical deadlock when called from receiver | |
482 | * on an D_INCONSISTENT R_PRIMARY: | |
483 | * remote READ does inc_ap_bio, receiver would need to receive answer | |
484 | * packet from remote to dec_ap_bio again. | |
485 | * receiver receive_sizes(), comes here, | |
486 | * waits for ap_bio_cnt == 0. -> deadlock. | |
487 | * but this cannot happen, actually, because: | |
488 | * R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable | |
489 | * (not connected, or bad/no disk on peer): | |
490 | * see drbd_fail_request_early, ap_bio_cnt is zero. | |
491 | * R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET: | |
492 | * peer may not initiate a resize. | |
493 | */ | |
494 | void drbd_suspend_io(struct drbd_conf *mdev) | |
495 | { | |
496 | set_bit(SUSPEND_IO, &mdev->flags); | |
497 | wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt)); | |
498 | } | |
499 | ||
500 | void drbd_resume_io(struct drbd_conf *mdev) | |
501 | { | |
502 | clear_bit(SUSPEND_IO, &mdev->flags); | |
503 | wake_up(&mdev->misc_wait); | |
504 | } | |
505 | ||
506 | /** | |
507 | * drbd_determine_dev_size() - Sets the right device size obeying all constraints | |
508 | * @mdev: DRBD device. | |
509 | * | |
510 | * Returns 0 on success, negative return values indicate errors. | |
511 | * You should call drbd_md_sync() after calling this function. | |
512 | */ | |
a393db6f | 513 | enum determine_dev_size drbd_determin_dev_size(struct drbd_conf *mdev, int force) __must_hold(local) |
b411b363 PR |
514 | { |
515 | sector_t prev_first_sect, prev_size; /* previous meta location */ | |
516 | sector_t la_size; | |
517 | sector_t size; | |
518 | char ppb[10]; | |
519 | ||
520 | int md_moved, la_size_changed; | |
521 | enum determine_dev_size rv = unchanged; | |
522 | ||
523 | /* race: | |
524 | * application request passes inc_ap_bio, | |
525 | * but then cannot get an AL-reference. | |
526 | * this function later may wait on ap_bio_cnt == 0. -> deadlock. | |
527 | * | |
528 | * to avoid that: | |
529 | * Suspend IO right here. | |
530 | * still lock the act_log to not trigger ASSERTs there. | |
531 | */ | |
532 | drbd_suspend_io(mdev); | |
533 | ||
534 | /* no wait necessary anymore, actually we could assert that */ | |
535 | wait_event(mdev->al_wait, lc_try_lock(mdev->act_log)); | |
536 | ||
537 | prev_first_sect = drbd_md_first_sector(mdev->ldev); | |
538 | prev_size = mdev->ldev->md.md_size_sect; | |
539 | la_size = mdev->ldev->md.la_size_sect; | |
540 | ||
541 | /* TODO: should only be some assert here, not (re)init... */ | |
542 | drbd_md_set_sector_offsets(mdev, mdev->ldev); | |
543 | ||
a393db6f | 544 | size = drbd_new_dev_size(mdev, mdev->ldev, force); |
b411b363 PR |
545 | |
546 | if (drbd_get_capacity(mdev->this_bdev) != size || | |
547 | drbd_bm_capacity(mdev) != size) { | |
548 | int err; | |
549 | err = drbd_bm_resize(mdev, size); | |
550 | if (unlikely(err)) { | |
551 | /* currently there is only one error: ENOMEM! */ | |
552 | size = drbd_bm_capacity(mdev)>>1; | |
553 | if (size == 0) { | |
554 | dev_err(DEV, "OUT OF MEMORY! " | |
555 | "Could not allocate bitmap!\n"); | |
556 | } else { | |
557 | dev_err(DEV, "BM resizing failed. " | |
558 | "Leaving size unchanged at size = %lu KB\n", | |
559 | (unsigned long)size); | |
560 | } | |
561 | rv = dev_size_error; | |
562 | } | |
563 | /* racy, see comments above. */ | |
564 | drbd_set_my_capacity(mdev, size); | |
565 | mdev->ldev->md.la_size_sect = size; | |
566 | dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1), | |
567 | (unsigned long long)size>>1); | |
568 | } | |
569 | if (rv == dev_size_error) | |
570 | goto out; | |
571 | ||
572 | la_size_changed = (la_size != mdev->ldev->md.la_size_sect); | |
573 | ||
574 | md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev) | |
575 | || prev_size != mdev->ldev->md.md_size_sect; | |
576 | ||
577 | if (la_size_changed || md_moved) { | |
578 | drbd_al_shrink(mdev); /* All extents inactive. */ | |
579 | dev_info(DEV, "Writing the whole bitmap, %s\n", | |
580 | la_size_changed && md_moved ? "size changed and md moved" : | |
581 | la_size_changed ? "size changed" : "md moved"); | |
582 | rv = drbd_bitmap_io(mdev, &drbd_bm_write, "size changed"); /* does drbd_resume_io() ! */ | |
583 | drbd_md_mark_dirty(mdev); | |
584 | } | |
585 | ||
586 | if (size > la_size) | |
587 | rv = grew; | |
588 | if (size < la_size) | |
589 | rv = shrunk; | |
590 | out: | |
591 | lc_unlock(mdev->act_log); | |
592 | wake_up(&mdev->al_wait); | |
593 | drbd_resume_io(mdev); | |
594 | ||
595 | return rv; | |
596 | } | |
597 | ||
598 | sector_t | |
a393db6f | 599 | drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev, int assume_peer_has_space) |
b411b363 PR |
600 | { |
601 | sector_t p_size = mdev->p_size; /* partner's disk size. */ | |
602 | sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */ | |
603 | sector_t m_size; /* my size */ | |
604 | sector_t u_size = bdev->dc.disk_size; /* size requested by user. */ | |
605 | sector_t size = 0; | |
606 | ||
607 | m_size = drbd_get_max_capacity(bdev); | |
608 | ||
a393db6f PR |
609 | if (mdev->state.conn < C_CONNECTED && assume_peer_has_space) { |
610 | dev_warn(DEV, "Resize while not connected was forced by the user!\n"); | |
611 | p_size = m_size; | |
612 | } | |
613 | ||
b411b363 PR |
614 | if (p_size && m_size) { |
615 | size = min_t(sector_t, p_size, m_size); | |
616 | } else { | |
617 | if (la_size) { | |
618 | size = la_size; | |
619 | if (m_size && m_size < size) | |
620 | size = m_size; | |
621 | if (p_size && p_size < size) | |
622 | size = p_size; | |
623 | } else { | |
624 | if (m_size) | |
625 | size = m_size; | |
626 | if (p_size) | |
627 | size = p_size; | |
628 | } | |
629 | } | |
630 | ||
631 | if (size == 0) | |
632 | dev_err(DEV, "Both nodes diskless!\n"); | |
633 | ||
634 | if (u_size) { | |
635 | if (u_size > size) | |
636 | dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n", | |
637 | (unsigned long)u_size>>1, (unsigned long)size>>1); | |
638 | else | |
639 | size = u_size; | |
640 | } | |
641 | ||
642 | return size; | |
643 | } | |
644 | ||
645 | /** | |
646 | * drbd_check_al_size() - Ensures that the AL is of the right size | |
647 | * @mdev: DRBD device. | |
648 | * | |
649 | * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation | |
650 | * failed, and 0 on success. You should call drbd_md_sync() after you called | |
651 | * this function. | |
652 | */ | |
653 | static int drbd_check_al_size(struct drbd_conf *mdev) | |
654 | { | |
655 | struct lru_cache *n, *t; | |
656 | struct lc_element *e; | |
657 | unsigned int in_use; | |
658 | int i; | |
659 | ||
660 | ERR_IF(mdev->sync_conf.al_extents < 7) | |
661 | mdev->sync_conf.al_extents = 127; | |
662 | ||
663 | if (mdev->act_log && | |
664 | mdev->act_log->nr_elements == mdev->sync_conf.al_extents) | |
665 | return 0; | |
666 | ||
667 | in_use = 0; | |
668 | t = mdev->act_log; | |
669 | n = lc_create("act_log", drbd_al_ext_cache, | |
670 | mdev->sync_conf.al_extents, sizeof(struct lc_element), 0); | |
671 | ||
672 | if (n == NULL) { | |
673 | dev_err(DEV, "Cannot allocate act_log lru!\n"); | |
674 | return -ENOMEM; | |
675 | } | |
676 | spin_lock_irq(&mdev->al_lock); | |
677 | if (t) { | |
678 | for (i = 0; i < t->nr_elements; i++) { | |
679 | e = lc_element_by_index(t, i); | |
680 | if (e->refcnt) | |
681 | dev_err(DEV, "refcnt(%d)==%d\n", | |
682 | e->lc_number, e->refcnt); | |
683 | in_use += e->refcnt; | |
684 | } | |
685 | } | |
686 | if (!in_use) | |
687 | mdev->act_log = n; | |
688 | spin_unlock_irq(&mdev->al_lock); | |
689 | if (in_use) { | |
690 | dev_err(DEV, "Activity log still in use!\n"); | |
691 | lc_destroy(n); | |
692 | return -EBUSY; | |
693 | } else { | |
694 | if (t) | |
695 | lc_destroy(t); | |
696 | } | |
697 | drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */ | |
698 | return 0; | |
699 | } | |
700 | ||
701 | void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_seg_s) __must_hold(local) | |
702 | { | |
703 | struct request_queue * const q = mdev->rq_queue; | |
704 | struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue; | |
705 | int max_segments = mdev->ldev->dc.max_bio_bvecs; | |
706 | ||
707 | if (b->merge_bvec_fn && !mdev->ldev->dc.use_bmbv) | |
708 | max_seg_s = PAGE_SIZE; | |
709 | ||
710 | max_seg_s = min(queue_max_sectors(b) * queue_logical_block_size(b), max_seg_s); | |
711 | ||
712 | blk_queue_max_sectors(q, max_seg_s >> 9); | |
713 | blk_queue_max_phys_segments(q, max_segments ? max_segments : MAX_PHYS_SEGMENTS); | |
714 | blk_queue_max_hw_segments(q, max_segments ? max_segments : MAX_HW_SEGMENTS); | |
715 | blk_queue_max_segment_size(q, max_seg_s); | |
716 | blk_queue_logical_block_size(q, 512); | |
717 | blk_queue_segment_boundary(q, PAGE_SIZE-1); | |
718 | blk_stack_limits(&q->limits, &b->limits, 0); | |
719 | ||
720 | if (b->merge_bvec_fn) | |
721 | dev_warn(DEV, "Backing device's merge_bvec_fn() = %p\n", | |
722 | b->merge_bvec_fn); | |
723 | dev_info(DEV, "max_segment_size ( = BIO size ) = %u\n", queue_max_segment_size(q)); | |
724 | ||
725 | if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) { | |
726 | dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n", | |
727 | q->backing_dev_info.ra_pages, | |
728 | b->backing_dev_info.ra_pages); | |
729 | q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages; | |
730 | } | |
731 | } | |
732 | ||
733 | /* serialize deconfig (worker exiting, doing cleanup) | |
734 | * and reconfig (drbdsetup disk, drbdsetup net) | |
735 | * | |
736 | * wait for a potentially exiting worker, then restart it, | |
737 | * or start a new one. | |
738 | */ | |
739 | static void drbd_reconfig_start(struct drbd_conf *mdev) | |
740 | { | |
6c6c7951 | 741 | wait_event(mdev->state_wait, !test_and_set_bit(CONFIG_PENDING, &mdev->flags)); |
b411b363 PR |
742 | wait_event(mdev->state_wait, !test_bit(DEVICE_DYING, &mdev->flags)); |
743 | drbd_thread_start(&mdev->worker); | |
744 | } | |
745 | ||
746 | /* if still unconfigured, stops worker again. | |
747 | * if configured now, clears CONFIG_PENDING. | |
748 | * wakes potential waiters */ | |
749 | static void drbd_reconfig_done(struct drbd_conf *mdev) | |
750 | { | |
751 | spin_lock_irq(&mdev->req_lock); | |
752 | if (mdev->state.disk == D_DISKLESS && | |
753 | mdev->state.conn == C_STANDALONE && | |
754 | mdev->state.role == R_SECONDARY) { | |
755 | set_bit(DEVICE_DYING, &mdev->flags); | |
756 | drbd_thread_stop_nowait(&mdev->worker); | |
757 | } else | |
758 | clear_bit(CONFIG_PENDING, &mdev->flags); | |
759 | spin_unlock_irq(&mdev->req_lock); | |
760 | wake_up(&mdev->state_wait); | |
761 | } | |
762 | ||
763 | /* does always return 0; | |
764 | * interesting return code is in reply->ret_code */ | |
765 | static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, | |
766 | struct drbd_nl_cfg_reply *reply) | |
767 | { | |
768 | enum drbd_ret_codes retcode; | |
769 | enum determine_dev_size dd; | |
770 | sector_t max_possible_sectors; | |
771 | sector_t min_md_device_sectors; | |
772 | struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */ | |
773 | struct inode *inode, *inode2; | |
774 | struct lru_cache *resync_lru = NULL; | |
775 | union drbd_state ns, os; | |
776 | int rv; | |
777 | int cp_discovered = 0; | |
778 | int logical_block_size; | |
779 | ||
780 | drbd_reconfig_start(mdev); | |
781 | ||
782 | /* if you want to reconfigure, please tear down first */ | |
783 | if (mdev->state.disk > D_DISKLESS) { | |
784 | retcode = ERR_DISK_CONFIGURED; | |
785 | goto fail; | |
786 | } | |
787 | ||
788 | /* allocation not in the IO path, cqueue thread context */ | |
789 | nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL); | |
790 | if (!nbc) { | |
791 | retcode = ERR_NOMEM; | |
792 | goto fail; | |
793 | } | |
794 | ||
795 | nbc->dc.disk_size = DRBD_DISK_SIZE_SECT_DEF; | |
796 | nbc->dc.on_io_error = DRBD_ON_IO_ERROR_DEF; | |
797 | nbc->dc.fencing = DRBD_FENCING_DEF; | |
798 | nbc->dc.max_bio_bvecs = DRBD_MAX_BIO_BVECS_DEF; | |
799 | ||
800 | if (!disk_conf_from_tags(mdev, nlp->tag_list, &nbc->dc)) { | |
801 | retcode = ERR_MANDATORY_TAG; | |
802 | goto fail; | |
803 | } | |
804 | ||
805 | if (nbc->dc.meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) { | |
806 | retcode = ERR_MD_IDX_INVALID; | |
807 | goto fail; | |
808 | } | |
809 | ||
810 | nbc->lo_file = filp_open(nbc->dc.backing_dev, O_RDWR, 0); | |
811 | if (IS_ERR(nbc->lo_file)) { | |
812 | dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev, | |
813 | PTR_ERR(nbc->lo_file)); | |
814 | nbc->lo_file = NULL; | |
815 | retcode = ERR_OPEN_DISK; | |
816 | goto fail; | |
817 | } | |
818 | ||
819 | inode = nbc->lo_file->f_dentry->d_inode; | |
820 | ||
821 | if (!S_ISBLK(inode->i_mode)) { | |
822 | retcode = ERR_DISK_NOT_BDEV; | |
823 | goto fail; | |
824 | } | |
825 | ||
826 | nbc->md_file = filp_open(nbc->dc.meta_dev, O_RDWR, 0); | |
827 | if (IS_ERR(nbc->md_file)) { | |
828 | dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev, | |
829 | PTR_ERR(nbc->md_file)); | |
830 | nbc->md_file = NULL; | |
831 | retcode = ERR_OPEN_MD_DISK; | |
832 | goto fail; | |
833 | } | |
834 | ||
835 | inode2 = nbc->md_file->f_dentry->d_inode; | |
836 | ||
837 | if (!S_ISBLK(inode2->i_mode)) { | |
838 | retcode = ERR_MD_NOT_BDEV; | |
839 | goto fail; | |
840 | } | |
841 | ||
842 | nbc->backing_bdev = inode->i_bdev; | |
843 | if (bd_claim(nbc->backing_bdev, mdev)) { | |
844 | printk(KERN_ERR "drbd: bd_claim(%p,%p); failed [%p;%p;%u]\n", | |
845 | nbc->backing_bdev, mdev, | |
846 | nbc->backing_bdev->bd_holder, | |
847 | nbc->backing_bdev->bd_contains->bd_holder, | |
848 | nbc->backing_bdev->bd_holders); | |
849 | retcode = ERR_BDCLAIM_DISK; | |
850 | goto fail; | |
851 | } | |
852 | ||
853 | resync_lru = lc_create("resync", drbd_bm_ext_cache, | |
854 | 61, sizeof(struct bm_extent), | |
855 | offsetof(struct bm_extent, lce)); | |
856 | if (!resync_lru) { | |
857 | retcode = ERR_NOMEM; | |
858 | goto release_bdev_fail; | |
859 | } | |
860 | ||
861 | /* meta_dev_idx >= 0: external fixed size, | |
862 | * possibly multiple drbd sharing one meta device. | |
863 | * TODO in that case, paranoia check that [md_bdev, meta_dev_idx] is | |
864 | * not yet used by some other drbd minor! | |
865 | * (if you use drbd.conf + drbdadm, | |
866 | * that should check it for you already; but if you don't, or someone | |
867 | * fooled it, we need to double check here) */ | |
868 | nbc->md_bdev = inode2->i_bdev; | |
869 | if (bd_claim(nbc->md_bdev, (nbc->dc.meta_dev_idx < 0) ? (void *)mdev | |
870 | : (void *) drbd_m_holder)) { | |
871 | retcode = ERR_BDCLAIM_MD_DISK; | |
872 | goto release_bdev_fail; | |
873 | } | |
874 | ||
875 | if ((nbc->backing_bdev == nbc->md_bdev) != | |
876 | (nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL || | |
877 | nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) { | |
878 | retcode = ERR_MD_IDX_INVALID; | |
879 | goto release_bdev2_fail; | |
880 | } | |
881 | ||
882 | /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */ | |
883 | drbd_md_set_sector_offsets(mdev, nbc); | |
884 | ||
885 | if (drbd_get_max_capacity(nbc) < nbc->dc.disk_size) { | |
886 | dev_err(DEV, "max capacity %llu smaller than disk size %llu\n", | |
887 | (unsigned long long) drbd_get_max_capacity(nbc), | |
888 | (unsigned long long) nbc->dc.disk_size); | |
889 | retcode = ERR_DISK_TO_SMALL; | |
890 | goto release_bdev2_fail; | |
891 | } | |
892 | ||
893 | if (nbc->dc.meta_dev_idx < 0) { | |
894 | max_possible_sectors = DRBD_MAX_SECTORS_FLEX; | |
895 | /* at least one MB, otherwise it does not make sense */ | |
896 | min_md_device_sectors = (2<<10); | |
897 | } else { | |
898 | max_possible_sectors = DRBD_MAX_SECTORS; | |
899 | min_md_device_sectors = MD_RESERVED_SECT * (nbc->dc.meta_dev_idx + 1); | |
900 | } | |
901 | ||
b411b363 PR |
902 | if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) { |
903 | retcode = ERR_MD_DISK_TO_SMALL; | |
904 | dev_warn(DEV, "refusing attach: md-device too small, " | |
905 | "at least %llu sectors needed for this meta-disk type\n", | |
906 | (unsigned long long) min_md_device_sectors); | |
907 | goto release_bdev2_fail; | |
908 | } | |
909 | ||
910 | /* Make sure the new disk is big enough | |
911 | * (we may currently be R_PRIMARY with no local disk...) */ | |
912 | if (drbd_get_max_capacity(nbc) < | |
913 | drbd_get_capacity(mdev->this_bdev)) { | |
914 | retcode = ERR_DISK_TO_SMALL; | |
915 | goto release_bdev2_fail; | |
916 | } | |
917 | ||
918 | nbc->known_size = drbd_get_capacity(nbc->backing_bdev); | |
919 | ||
1352994b LE |
920 | if (nbc->known_size > max_possible_sectors) { |
921 | dev_warn(DEV, "==> truncating very big lower level device " | |
922 | "to currently maximum possible %llu sectors <==\n", | |
923 | (unsigned long long) max_possible_sectors); | |
924 | if (nbc->dc.meta_dev_idx >= 0) | |
925 | dev_warn(DEV, "==>> using internal or flexible " | |
926 | "meta data may help <<==\n"); | |
927 | } | |
928 | ||
b411b363 PR |
929 | drbd_suspend_io(mdev); |
930 | /* also wait for the last barrier ack. */ | |
931 | wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt)); | |
932 | /* and for any other previously queued work */ | |
933 | drbd_flush_workqueue(mdev); | |
934 | ||
935 | retcode = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE); | |
936 | drbd_resume_io(mdev); | |
937 | if (retcode < SS_SUCCESS) | |
938 | goto release_bdev2_fail; | |
939 | ||
940 | if (!get_ldev_if_state(mdev, D_ATTACHING)) | |
941 | goto force_diskless; | |
942 | ||
943 | drbd_md_set_sector_offsets(mdev, nbc); | |
944 | ||
945 | if (!mdev->bitmap) { | |
946 | if (drbd_bm_init(mdev)) { | |
947 | retcode = ERR_NOMEM; | |
948 | goto force_diskless_dec; | |
949 | } | |
950 | } | |
951 | ||
952 | retcode = drbd_md_read(mdev, nbc); | |
953 | if (retcode != NO_ERROR) | |
954 | goto force_diskless_dec; | |
955 | ||
956 | if (mdev->state.conn < C_CONNECTED && | |
957 | mdev->state.role == R_PRIMARY && | |
958 | (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) { | |
959 | dev_err(DEV, "Can only attach to data with current UUID=%016llX\n", | |
960 | (unsigned long long)mdev->ed_uuid); | |
961 | retcode = ERR_DATA_NOT_CURRENT; | |
962 | goto force_diskless_dec; | |
963 | } | |
964 | ||
965 | /* Since we are diskless, fix the activity log first... */ | |
966 | if (drbd_check_al_size(mdev)) { | |
967 | retcode = ERR_NOMEM; | |
968 | goto force_diskless_dec; | |
969 | } | |
970 | ||
971 | /* Prevent shrinking of consistent devices ! */ | |
972 | if (drbd_md_test_flag(nbc, MDF_CONSISTENT) && | |
a393db6f | 973 | drbd_new_dev_size(mdev, nbc, 0) < nbc->md.la_size_sect) { |
b411b363 PR |
974 | dev_warn(DEV, "refusing to truncate a consistent device\n"); |
975 | retcode = ERR_DISK_TO_SMALL; | |
976 | goto force_diskless_dec; | |
977 | } | |
978 | ||
979 | if (!drbd_al_read_log(mdev, nbc)) { | |
980 | retcode = ERR_IO_MD_DISK; | |
981 | goto force_diskless_dec; | |
982 | } | |
983 | ||
984 | /* allocate a second IO page if logical_block_size != 512 */ | |
985 | logical_block_size = bdev_logical_block_size(nbc->md_bdev); | |
986 | if (logical_block_size == 0) | |
987 | logical_block_size = MD_SECTOR_SIZE; | |
988 | ||
989 | if (logical_block_size != MD_SECTOR_SIZE) { | |
990 | if (!mdev->md_io_tmpp) { | |
991 | struct page *page = alloc_page(GFP_NOIO); | |
992 | if (!page) | |
993 | goto force_diskless_dec; | |
994 | ||
995 | dev_warn(DEV, "Meta data's bdev logical_block_size = %d != %d\n", | |
996 | logical_block_size, MD_SECTOR_SIZE); | |
997 | dev_warn(DEV, "Workaround engaged (has performance impact).\n"); | |
998 | ||
999 | mdev->md_io_tmpp = page; | |
1000 | } | |
1001 | } | |
1002 | ||
1003 | /* Reset the "barriers don't work" bits here, then force meta data to | |
1004 | * be written, to ensure we determine if barriers are supported. */ | |
1005 | if (nbc->dc.no_md_flush) | |
1006 | set_bit(MD_NO_BARRIER, &mdev->flags); | |
1007 | else | |
1008 | clear_bit(MD_NO_BARRIER, &mdev->flags); | |
1009 | ||
1010 | /* Point of no return reached. | |
1011 | * Devices and memory are no longer released by error cleanup below. | |
1012 | * now mdev takes over responsibility, and the state engine should | |
1013 | * clean it up somewhere. */ | |
1014 | D_ASSERT(mdev->ldev == NULL); | |
1015 | mdev->ldev = nbc; | |
1016 | mdev->resync = resync_lru; | |
1017 | nbc = NULL; | |
1018 | resync_lru = NULL; | |
1019 | ||
1020 | mdev->write_ordering = WO_bio_barrier; | |
1021 | drbd_bump_write_ordering(mdev, WO_bio_barrier); | |
1022 | ||
1023 | if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY)) | |
1024 | set_bit(CRASHED_PRIMARY, &mdev->flags); | |
1025 | else | |
1026 | clear_bit(CRASHED_PRIMARY, &mdev->flags); | |
1027 | ||
1028 | if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND)) { | |
1029 | set_bit(CRASHED_PRIMARY, &mdev->flags); | |
1030 | cp_discovered = 1; | |
1031 | } | |
1032 | ||
1033 | mdev->send_cnt = 0; | |
1034 | mdev->recv_cnt = 0; | |
1035 | mdev->read_cnt = 0; | |
1036 | mdev->writ_cnt = 0; | |
1037 | ||
1038 | drbd_setup_queue_param(mdev, DRBD_MAX_SEGMENT_SIZE); | |
1039 | ||
1040 | /* If I am currently not R_PRIMARY, | |
1041 | * but meta data primary indicator is set, | |
1042 | * I just now recover from a hard crash, | |
1043 | * and have been R_PRIMARY before that crash. | |
1044 | * | |
1045 | * Now, if I had no connection before that crash | |
1046 | * (have been degraded R_PRIMARY), chances are that | |
1047 | * I won't find my peer now either. | |
1048 | * | |
1049 | * In that case, and _only_ in that case, | |
1050 | * we use the degr-wfc-timeout instead of the default, | |
1051 | * so we can automatically recover from a crash of a | |
1052 | * degraded but active "cluster" after a certain timeout. | |
1053 | */ | |
1054 | clear_bit(USE_DEGR_WFC_T, &mdev->flags); | |
1055 | if (mdev->state.role != R_PRIMARY && | |
1056 | drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) && | |
1057 | !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND)) | |
1058 | set_bit(USE_DEGR_WFC_T, &mdev->flags); | |
1059 | ||
a393db6f | 1060 | dd = drbd_determin_dev_size(mdev, 0); |
b411b363 PR |
1061 | if (dd == dev_size_error) { |
1062 | retcode = ERR_NOMEM_BITMAP; | |
1063 | goto force_diskless_dec; | |
1064 | } else if (dd == grew) | |
1065 | set_bit(RESYNC_AFTER_NEG, &mdev->flags); | |
1066 | ||
1067 | if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) { | |
1068 | dev_info(DEV, "Assuming that all blocks are out of sync " | |
1069 | "(aka FullSync)\n"); | |
1070 | if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from attaching")) { | |
1071 | retcode = ERR_IO_MD_DISK; | |
1072 | goto force_diskless_dec; | |
1073 | } | |
1074 | } else { | |
1075 | if (drbd_bitmap_io(mdev, &drbd_bm_read, "read from attaching") < 0) { | |
1076 | retcode = ERR_IO_MD_DISK; | |
1077 | goto force_diskless_dec; | |
1078 | } | |
1079 | } | |
1080 | ||
1081 | if (cp_discovered) { | |
1082 | drbd_al_apply_to_bm(mdev); | |
1083 | drbd_al_to_on_disk_bm(mdev); | |
1084 | } | |
1085 | ||
1086 | spin_lock_irq(&mdev->req_lock); | |
1087 | os = mdev->state; | |
1088 | ns.i = os.i; | |
1089 | /* If MDF_CONSISTENT is not set go into inconsistent state, | |
1090 | otherwise investigate MDF_WasUpToDate... | |
1091 | If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state, | |
1092 | otherwise into D_CONSISTENT state. | |
1093 | */ | |
1094 | if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) { | |
1095 | if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE)) | |
1096 | ns.disk = D_CONSISTENT; | |
1097 | else | |
1098 | ns.disk = D_OUTDATED; | |
1099 | } else { | |
1100 | ns.disk = D_INCONSISTENT; | |
1101 | } | |
1102 | ||
1103 | if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED)) | |
1104 | ns.pdsk = D_OUTDATED; | |
1105 | ||
1106 | if ( ns.disk == D_CONSISTENT && | |
1107 | (ns.pdsk == D_OUTDATED || mdev->ldev->dc.fencing == FP_DONT_CARE)) | |
1108 | ns.disk = D_UP_TO_DATE; | |
1109 | ||
1110 | /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND, | |
1111 | MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before | |
1112 | this point, because drbd_request_state() modifies these | |
1113 | flags. */ | |
1114 | ||
1115 | /* In case we are C_CONNECTED postpone any decision on the new disk | |
1116 | state after the negotiation phase. */ | |
1117 | if (mdev->state.conn == C_CONNECTED) { | |
1118 | mdev->new_state_tmp.i = ns.i; | |
1119 | ns.i = os.i; | |
1120 | ns.disk = D_NEGOTIATING; | |
1121 | } | |
1122 | ||
1123 | rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); | |
1124 | ns = mdev->state; | |
1125 | spin_unlock_irq(&mdev->req_lock); | |
1126 | ||
1127 | if (rv < SS_SUCCESS) | |
1128 | goto force_diskless_dec; | |
1129 | ||
1130 | if (mdev->state.role == R_PRIMARY) | |
1131 | mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1; | |
1132 | else | |
1133 | mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1; | |
1134 | ||
1135 | drbd_md_mark_dirty(mdev); | |
1136 | drbd_md_sync(mdev); | |
1137 | ||
1138 | kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); | |
1139 | put_ldev(mdev); | |
1140 | reply->ret_code = retcode; | |
1141 | drbd_reconfig_done(mdev); | |
1142 | return 0; | |
1143 | ||
1144 | force_diskless_dec: | |
1145 | put_ldev(mdev); | |
1146 | force_diskless: | |
1147 | drbd_force_state(mdev, NS(disk, D_DISKLESS)); | |
1148 | drbd_md_sync(mdev); | |
1149 | release_bdev2_fail: | |
1150 | if (nbc) | |
1151 | bd_release(nbc->md_bdev); | |
1152 | release_bdev_fail: | |
1153 | if (nbc) | |
1154 | bd_release(nbc->backing_bdev); | |
1155 | fail: | |
1156 | if (nbc) { | |
1157 | if (nbc->lo_file) | |
1158 | fput(nbc->lo_file); | |
1159 | if (nbc->md_file) | |
1160 | fput(nbc->md_file); | |
1161 | kfree(nbc); | |
1162 | } | |
1163 | lc_destroy(resync_lru); | |
1164 | ||
1165 | reply->ret_code = retcode; | |
1166 | drbd_reconfig_done(mdev); | |
1167 | return 0; | |
1168 | } | |
1169 | ||
1170 | static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, | |
1171 | struct drbd_nl_cfg_reply *reply) | |
1172 | { | |
1173 | reply->ret_code = drbd_request_state(mdev, NS(disk, D_DISKLESS)); | |
1174 | return 0; | |
1175 | } | |
1176 | ||
1177 | static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, | |
1178 | struct drbd_nl_cfg_reply *reply) | |
1179 | { | |
1180 | int i, ns; | |
1181 | enum drbd_ret_codes retcode; | |
1182 | struct net_conf *new_conf = NULL; | |
1183 | struct crypto_hash *tfm = NULL; | |
1184 | struct crypto_hash *integrity_w_tfm = NULL; | |
1185 | struct crypto_hash *integrity_r_tfm = NULL; | |
1186 | struct hlist_head *new_tl_hash = NULL; | |
1187 | struct hlist_head *new_ee_hash = NULL; | |
1188 | struct drbd_conf *odev; | |
1189 | char hmac_name[CRYPTO_MAX_ALG_NAME]; | |
1190 | void *int_dig_out = NULL; | |
1191 | void *int_dig_in = NULL; | |
1192 | void *int_dig_vv = NULL; | |
1193 | struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr; | |
1194 | ||
1195 | drbd_reconfig_start(mdev); | |
1196 | ||
1197 | if (mdev->state.conn > C_STANDALONE) { | |
1198 | retcode = ERR_NET_CONFIGURED; | |
1199 | goto fail; | |
1200 | } | |
1201 | ||
1202 | /* allocation not in the IO path, cqueue thread context */ | |
1203 | new_conf = kmalloc(sizeof(struct net_conf), GFP_KERNEL); | |
1204 | if (!new_conf) { | |
1205 | retcode = ERR_NOMEM; | |
1206 | goto fail; | |
1207 | } | |
1208 | ||
1209 | memset(new_conf, 0, sizeof(struct net_conf)); | |
1210 | new_conf->timeout = DRBD_TIMEOUT_DEF; | |
1211 | new_conf->try_connect_int = DRBD_CONNECT_INT_DEF; | |
1212 | new_conf->ping_int = DRBD_PING_INT_DEF; | |
1213 | new_conf->max_epoch_size = DRBD_MAX_EPOCH_SIZE_DEF; | |
1214 | new_conf->max_buffers = DRBD_MAX_BUFFERS_DEF; | |
1215 | new_conf->unplug_watermark = DRBD_UNPLUG_WATERMARK_DEF; | |
1216 | new_conf->sndbuf_size = DRBD_SNDBUF_SIZE_DEF; | |
1217 | new_conf->rcvbuf_size = DRBD_RCVBUF_SIZE_DEF; | |
1218 | new_conf->ko_count = DRBD_KO_COUNT_DEF; | |
1219 | new_conf->after_sb_0p = DRBD_AFTER_SB_0P_DEF; | |
1220 | new_conf->after_sb_1p = DRBD_AFTER_SB_1P_DEF; | |
1221 | new_conf->after_sb_2p = DRBD_AFTER_SB_2P_DEF; | |
1222 | new_conf->want_lose = 0; | |
1223 | new_conf->two_primaries = 0; | |
1224 | new_conf->wire_protocol = DRBD_PROT_C; | |
1225 | new_conf->ping_timeo = DRBD_PING_TIMEO_DEF; | |
1226 | new_conf->rr_conflict = DRBD_RR_CONFLICT_DEF; | |
1227 | ||
1228 | if (!net_conf_from_tags(mdev, nlp->tag_list, new_conf)) { | |
1229 | retcode = ERR_MANDATORY_TAG; | |
1230 | goto fail; | |
1231 | } | |
1232 | ||
1233 | if (new_conf->two_primaries | |
1234 | && (new_conf->wire_protocol != DRBD_PROT_C)) { | |
1235 | retcode = ERR_NOT_PROTO_C; | |
1236 | goto fail; | |
1237 | }; | |
1238 | ||
1239 | if (mdev->state.role == R_PRIMARY && new_conf->want_lose) { | |
1240 | retcode = ERR_DISCARD; | |
1241 | goto fail; | |
1242 | } | |
1243 | ||
1244 | retcode = NO_ERROR; | |
1245 | ||
1246 | new_my_addr = (struct sockaddr *)&new_conf->my_addr; | |
1247 | new_peer_addr = (struct sockaddr *)&new_conf->peer_addr; | |
1248 | for (i = 0; i < minor_count; i++) { | |
1249 | odev = minor_to_mdev(i); | |
1250 | if (!odev || odev == mdev) | |
1251 | continue; | |
1252 | if (get_net_conf(odev)) { | |
1253 | taken_addr = (struct sockaddr *)&odev->net_conf->my_addr; | |
1254 | if (new_conf->my_addr_len == odev->net_conf->my_addr_len && | |
1255 | !memcmp(new_my_addr, taken_addr, new_conf->my_addr_len)) | |
1256 | retcode = ERR_LOCAL_ADDR; | |
1257 | ||
1258 | taken_addr = (struct sockaddr *)&odev->net_conf->peer_addr; | |
1259 | if (new_conf->peer_addr_len == odev->net_conf->peer_addr_len && | |
1260 | !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len)) | |
1261 | retcode = ERR_PEER_ADDR; | |
1262 | ||
1263 | put_net_conf(odev); | |
1264 | if (retcode != NO_ERROR) | |
1265 | goto fail; | |
1266 | } | |
1267 | } | |
1268 | ||
1269 | if (new_conf->cram_hmac_alg[0] != 0) { | |
1270 | snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)", | |
1271 | new_conf->cram_hmac_alg); | |
1272 | tfm = crypto_alloc_hash(hmac_name, 0, CRYPTO_ALG_ASYNC); | |
1273 | if (IS_ERR(tfm)) { | |
1274 | tfm = NULL; | |
1275 | retcode = ERR_AUTH_ALG; | |
1276 | goto fail; | |
1277 | } | |
1278 | ||
0798219f | 1279 | if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) { |
b411b363 PR |
1280 | retcode = ERR_AUTH_ALG_ND; |
1281 | goto fail; | |
1282 | } | |
1283 | } | |
1284 | ||
1285 | if (new_conf->integrity_alg[0]) { | |
1286 | integrity_w_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC); | |
1287 | if (IS_ERR(integrity_w_tfm)) { | |
1288 | integrity_w_tfm = NULL; | |
1289 | retcode=ERR_INTEGRITY_ALG; | |
1290 | goto fail; | |
1291 | } | |
1292 | ||
1293 | if (!drbd_crypto_is_hash(crypto_hash_tfm(integrity_w_tfm))) { | |
1294 | retcode=ERR_INTEGRITY_ALG_ND; | |
1295 | goto fail; | |
1296 | } | |
1297 | ||
1298 | integrity_r_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC); | |
1299 | if (IS_ERR(integrity_r_tfm)) { | |
1300 | integrity_r_tfm = NULL; | |
1301 | retcode=ERR_INTEGRITY_ALG; | |
1302 | goto fail; | |
1303 | } | |
1304 | } | |
1305 | ||
1306 | ns = new_conf->max_epoch_size/8; | |
1307 | if (mdev->tl_hash_s != ns) { | |
1308 | new_tl_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL); | |
1309 | if (!new_tl_hash) { | |
1310 | retcode = ERR_NOMEM; | |
1311 | goto fail; | |
1312 | } | |
1313 | } | |
1314 | ||
1315 | ns = new_conf->max_buffers/8; | |
1316 | if (new_conf->two_primaries && (mdev->ee_hash_s != ns)) { | |
1317 | new_ee_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL); | |
1318 | if (!new_ee_hash) { | |
1319 | retcode = ERR_NOMEM; | |
1320 | goto fail; | |
1321 | } | |
1322 | } | |
1323 | ||
1324 | ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0; | |
1325 | ||
1326 | if (integrity_w_tfm) { | |
1327 | i = crypto_hash_digestsize(integrity_w_tfm); | |
1328 | int_dig_out = kmalloc(i, GFP_KERNEL); | |
1329 | if (!int_dig_out) { | |
1330 | retcode = ERR_NOMEM; | |
1331 | goto fail; | |
1332 | } | |
1333 | int_dig_in = kmalloc(i, GFP_KERNEL); | |
1334 | if (!int_dig_in) { | |
1335 | retcode = ERR_NOMEM; | |
1336 | goto fail; | |
1337 | } | |
1338 | int_dig_vv = kmalloc(i, GFP_KERNEL); | |
1339 | if (!int_dig_vv) { | |
1340 | retcode = ERR_NOMEM; | |
1341 | goto fail; | |
1342 | } | |
1343 | } | |
1344 | ||
1345 | if (!mdev->bitmap) { | |
1346 | if(drbd_bm_init(mdev)) { | |
1347 | retcode = ERR_NOMEM; | |
1348 | goto fail; | |
1349 | } | |
1350 | } | |
1351 | ||
1352 | spin_lock_irq(&mdev->req_lock); | |
1353 | if (mdev->net_conf != NULL) { | |
1354 | retcode = ERR_NET_CONFIGURED; | |
1355 | spin_unlock_irq(&mdev->req_lock); | |
1356 | goto fail; | |
1357 | } | |
1358 | mdev->net_conf = new_conf; | |
1359 | ||
1360 | mdev->send_cnt = 0; | |
1361 | mdev->recv_cnt = 0; | |
1362 | ||
1363 | if (new_tl_hash) { | |
1364 | kfree(mdev->tl_hash); | |
1365 | mdev->tl_hash_s = mdev->net_conf->max_epoch_size/8; | |
1366 | mdev->tl_hash = new_tl_hash; | |
1367 | } | |
1368 | ||
1369 | if (new_ee_hash) { | |
1370 | kfree(mdev->ee_hash); | |
1371 | mdev->ee_hash_s = mdev->net_conf->max_buffers/8; | |
1372 | mdev->ee_hash = new_ee_hash; | |
1373 | } | |
1374 | ||
1375 | crypto_free_hash(mdev->cram_hmac_tfm); | |
1376 | mdev->cram_hmac_tfm = tfm; | |
1377 | ||
1378 | crypto_free_hash(mdev->integrity_w_tfm); | |
1379 | mdev->integrity_w_tfm = integrity_w_tfm; | |
1380 | ||
1381 | crypto_free_hash(mdev->integrity_r_tfm); | |
1382 | mdev->integrity_r_tfm = integrity_r_tfm; | |
1383 | ||
1384 | kfree(mdev->int_dig_out); | |
1385 | kfree(mdev->int_dig_in); | |
1386 | kfree(mdev->int_dig_vv); | |
1387 | mdev->int_dig_out=int_dig_out; | |
1388 | mdev->int_dig_in=int_dig_in; | |
1389 | mdev->int_dig_vv=int_dig_vv; | |
1390 | spin_unlock_irq(&mdev->req_lock); | |
1391 | ||
1392 | retcode = _drbd_request_state(mdev, NS(conn, C_UNCONNECTED), CS_VERBOSE); | |
1393 | ||
1394 | kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); | |
1395 | reply->ret_code = retcode; | |
1396 | drbd_reconfig_done(mdev); | |
1397 | return 0; | |
1398 | ||
1399 | fail: | |
1400 | kfree(int_dig_out); | |
1401 | kfree(int_dig_in); | |
1402 | kfree(int_dig_vv); | |
1403 | crypto_free_hash(tfm); | |
1404 | crypto_free_hash(integrity_w_tfm); | |
1405 | crypto_free_hash(integrity_r_tfm); | |
1406 | kfree(new_tl_hash); | |
1407 | kfree(new_ee_hash); | |
1408 | kfree(new_conf); | |
1409 | ||
1410 | reply->ret_code = retcode; | |
1411 | drbd_reconfig_done(mdev); | |
1412 | return 0; | |
1413 | } | |
1414 | ||
1415 | static int drbd_nl_disconnect(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, | |
1416 | struct drbd_nl_cfg_reply *reply) | |
1417 | { | |
1418 | int retcode; | |
1419 | ||
1420 | retcode = _drbd_request_state(mdev, NS(conn, C_DISCONNECTING), CS_ORDERED); | |
1421 | ||
1422 | if (retcode == SS_NOTHING_TO_DO) | |
1423 | goto done; | |
1424 | else if (retcode == SS_ALREADY_STANDALONE) | |
1425 | goto done; | |
1426 | else if (retcode == SS_PRIMARY_NOP) { | |
1427 | /* Our statche checking code wants to see the peer outdated. */ | |
1428 | retcode = drbd_request_state(mdev, NS2(conn, C_DISCONNECTING, | |
1429 | pdsk, D_OUTDATED)); | |
1430 | } else if (retcode == SS_CW_FAILED_BY_PEER) { | |
1431 | /* The peer probably wants to see us outdated. */ | |
1432 | retcode = _drbd_request_state(mdev, NS2(conn, C_DISCONNECTING, | |
1433 | disk, D_OUTDATED), | |
1434 | CS_ORDERED); | |
1435 | if (retcode == SS_IS_DISKLESS || retcode == SS_LOWER_THAN_OUTDATED) { | |
1436 | drbd_force_state(mdev, NS(conn, C_DISCONNECTING)); | |
1437 | retcode = SS_SUCCESS; | |
1438 | } | |
1439 | } | |
1440 | ||
1441 | if (retcode < SS_SUCCESS) | |
1442 | goto fail; | |
1443 | ||
1444 | if (wait_event_interruptible(mdev->state_wait, | |
1445 | mdev->state.conn != C_DISCONNECTING)) { | |
1446 | /* Do not test for mdev->state.conn == C_STANDALONE, since | |
1447 | someone else might connect us in the mean time! */ | |
1448 | retcode = ERR_INTR; | |
1449 | goto fail; | |
1450 | } | |
1451 | ||
1452 | done: | |
1453 | retcode = NO_ERROR; | |
1454 | fail: | |
1455 | drbd_md_sync(mdev); | |
1456 | reply->ret_code = retcode; | |
1457 | return 0; | |
1458 | } | |
1459 | ||
1460 | void resync_after_online_grow(struct drbd_conf *mdev) | |
1461 | { | |
1462 | int iass; /* I am sync source */ | |
1463 | ||
1464 | dev_info(DEV, "Resync of new storage after online grow\n"); | |
1465 | if (mdev->state.role != mdev->state.peer) | |
1466 | iass = (mdev->state.role == R_PRIMARY); | |
1467 | else | |
1468 | iass = test_bit(DISCARD_CONCURRENT, &mdev->flags); | |
1469 | ||
1470 | if (iass) | |
1471 | drbd_start_resync(mdev, C_SYNC_SOURCE); | |
1472 | else | |
1473 | _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE); | |
1474 | } | |
1475 | ||
1476 | static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, | |
1477 | struct drbd_nl_cfg_reply *reply) | |
1478 | { | |
1479 | struct resize rs; | |
1480 | int retcode = NO_ERROR; | |
1481 | int ldsc = 0; /* local disk size changed */ | |
1482 | enum determine_dev_size dd; | |
1483 | ||
1484 | memset(&rs, 0, sizeof(struct resize)); | |
1485 | if (!resize_from_tags(mdev, nlp->tag_list, &rs)) { | |
1486 | retcode = ERR_MANDATORY_TAG; | |
1487 | goto fail; | |
1488 | } | |
1489 | ||
1490 | if (mdev->state.conn > C_CONNECTED) { | |
1491 | retcode = ERR_RESIZE_RESYNC; | |
1492 | goto fail; | |
1493 | } | |
1494 | ||
1495 | if (mdev->state.role == R_SECONDARY && | |
1496 | mdev->state.peer == R_SECONDARY) { | |
1497 | retcode = ERR_NO_PRIMARY; | |
1498 | goto fail; | |
1499 | } | |
1500 | ||
1501 | if (!get_ldev(mdev)) { | |
1502 | retcode = ERR_NO_DISK; | |
1503 | goto fail; | |
1504 | } | |
1505 | ||
1506 | if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) { | |
1507 | mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev); | |
1508 | ldsc = 1; | |
1509 | } | |
1510 | ||
1511 | mdev->ldev->dc.disk_size = (sector_t)rs.resize_size; | |
a393db6f | 1512 | dd = drbd_determin_dev_size(mdev, rs.resize_force); |
b411b363 PR |
1513 | drbd_md_sync(mdev); |
1514 | put_ldev(mdev); | |
1515 | if (dd == dev_size_error) { | |
1516 | retcode = ERR_NOMEM_BITMAP; | |
1517 | goto fail; | |
1518 | } | |
1519 | ||
1520 | if (mdev->state.conn == C_CONNECTED && (dd != unchanged || ldsc)) { | |
1521 | if (dd == grew) | |
1522 | set_bit(RESIZE_PENDING, &mdev->flags); | |
1523 | ||
1524 | drbd_send_uuids(mdev); | |
1525 | drbd_send_sizes(mdev, 1); | |
1526 | } | |
1527 | ||
1528 | fail: | |
1529 | reply->ret_code = retcode; | |
1530 | return 0; | |
1531 | } | |
1532 | ||
1533 | static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, | |
1534 | struct drbd_nl_cfg_reply *reply) | |
1535 | { | |
1536 | int retcode = NO_ERROR; | |
1537 | int err; | |
1538 | int ovr; /* online verify running */ | |
1539 | int rsr; /* re-sync running */ | |
1540 | struct crypto_hash *verify_tfm = NULL; | |
1541 | struct crypto_hash *csums_tfm = NULL; | |
1542 | struct syncer_conf sc; | |
1543 | cpumask_var_t new_cpu_mask; | |
1544 | ||
1545 | if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) { | |
1546 | retcode = ERR_NOMEM; | |
1547 | goto fail; | |
1548 | } | |
1549 | ||
1550 | if (nlp->flags & DRBD_NL_SET_DEFAULTS) { | |
1551 | memset(&sc, 0, sizeof(struct syncer_conf)); | |
1552 | sc.rate = DRBD_RATE_DEF; | |
1553 | sc.after = DRBD_AFTER_DEF; | |
1554 | sc.al_extents = DRBD_AL_EXTENTS_DEF; | |
1555 | } else | |
1556 | memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf)); | |
1557 | ||
1558 | if (!syncer_conf_from_tags(mdev, nlp->tag_list, &sc)) { | |
1559 | retcode = ERR_MANDATORY_TAG; | |
1560 | goto fail; | |
1561 | } | |
1562 | ||
1563 | /* re-sync running */ | |
1564 | rsr = ( mdev->state.conn == C_SYNC_SOURCE || | |
1565 | mdev->state.conn == C_SYNC_TARGET || | |
1566 | mdev->state.conn == C_PAUSED_SYNC_S || | |
1567 | mdev->state.conn == C_PAUSED_SYNC_T ); | |
1568 | ||
1569 | if (rsr && strcmp(sc.csums_alg, mdev->sync_conf.csums_alg)) { | |
1570 | retcode = ERR_CSUMS_RESYNC_RUNNING; | |
1571 | goto fail; | |
1572 | } | |
1573 | ||
1574 | if (!rsr && sc.csums_alg[0]) { | |
1575 | csums_tfm = crypto_alloc_hash(sc.csums_alg, 0, CRYPTO_ALG_ASYNC); | |
1576 | if (IS_ERR(csums_tfm)) { | |
1577 | csums_tfm = NULL; | |
1578 | retcode = ERR_CSUMS_ALG; | |
1579 | goto fail; | |
1580 | } | |
1581 | ||
1582 | if (!drbd_crypto_is_hash(crypto_hash_tfm(csums_tfm))) { | |
1583 | retcode = ERR_CSUMS_ALG_ND; | |
1584 | goto fail; | |
1585 | } | |
1586 | } | |
1587 | ||
1588 | /* online verify running */ | |
1589 | ovr = (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T); | |
1590 | ||
1591 | if (ovr) { | |
1592 | if (strcmp(sc.verify_alg, mdev->sync_conf.verify_alg)) { | |
1593 | retcode = ERR_VERIFY_RUNNING; | |
1594 | goto fail; | |
1595 | } | |
1596 | } | |
1597 | ||
1598 | if (!ovr && sc.verify_alg[0]) { | |
1599 | verify_tfm = crypto_alloc_hash(sc.verify_alg, 0, CRYPTO_ALG_ASYNC); | |
1600 | if (IS_ERR(verify_tfm)) { | |
1601 | verify_tfm = NULL; | |
1602 | retcode = ERR_VERIFY_ALG; | |
1603 | goto fail; | |
1604 | } | |
1605 | ||
1606 | if (!drbd_crypto_is_hash(crypto_hash_tfm(verify_tfm))) { | |
1607 | retcode = ERR_VERIFY_ALG_ND; | |
1608 | goto fail; | |
1609 | } | |
1610 | } | |
1611 | ||
1612 | /* silently ignore cpu mask on UP kernel */ | |
1613 | if (nr_cpu_ids > 1 && sc.cpu_mask[0] != 0) { | |
1614 | err = __bitmap_parse(sc.cpu_mask, 32, 0, | |
1615 | cpumask_bits(new_cpu_mask), nr_cpu_ids); | |
1616 | if (err) { | |
1617 | dev_warn(DEV, "__bitmap_parse() failed with %d\n", err); | |
1618 | retcode = ERR_CPU_MASK_PARSE; | |
1619 | goto fail; | |
1620 | } | |
1621 | } | |
1622 | ||
1623 | ERR_IF (sc.rate < 1) sc.rate = 1; | |
1624 | ERR_IF (sc.al_extents < 7) sc.al_extents = 127; /* arbitrary minimum */ | |
1625 | #define AL_MAX ((MD_AL_MAX_SIZE-1) * AL_EXTENTS_PT) | |
1626 | if (sc.al_extents > AL_MAX) { | |
1627 | dev_err(DEV, "sc.al_extents > %d\n", AL_MAX); | |
1628 | sc.al_extents = AL_MAX; | |
1629 | } | |
1630 | #undef AL_MAX | |
1631 | ||
1632 | /* most sanity checks done, try to assign the new sync-after | |
1633 | * dependency. need to hold the global lock in there, | |
1634 | * to avoid a race in the dependency loop check. */ | |
1635 | retcode = drbd_alter_sa(mdev, sc.after); | |
1636 | if (retcode != NO_ERROR) | |
1637 | goto fail; | |
1638 | ||
1639 | /* ok, assign the rest of it as well. | |
1640 | * lock against receive_SyncParam() */ | |
1641 | spin_lock(&mdev->peer_seq_lock); | |
1642 | mdev->sync_conf = sc; | |
1643 | ||
1644 | if (!rsr) { | |
1645 | crypto_free_hash(mdev->csums_tfm); | |
1646 | mdev->csums_tfm = csums_tfm; | |
1647 | csums_tfm = NULL; | |
1648 | } | |
1649 | ||
1650 | if (!ovr) { | |
1651 | crypto_free_hash(mdev->verify_tfm); | |
1652 | mdev->verify_tfm = verify_tfm; | |
1653 | verify_tfm = NULL; | |
1654 | } | |
1655 | spin_unlock(&mdev->peer_seq_lock); | |
1656 | ||
1657 | if (get_ldev(mdev)) { | |
1658 | wait_event(mdev->al_wait, lc_try_lock(mdev->act_log)); | |
1659 | drbd_al_shrink(mdev); | |
1660 | err = drbd_check_al_size(mdev); | |
1661 | lc_unlock(mdev->act_log); | |
1662 | wake_up(&mdev->al_wait); | |
1663 | ||
1664 | put_ldev(mdev); | |
1665 | drbd_md_sync(mdev); | |
1666 | ||
1667 | if (err) { | |
1668 | retcode = ERR_NOMEM; | |
1669 | goto fail; | |
1670 | } | |
1671 | } | |
1672 | ||
1673 | if (mdev->state.conn >= C_CONNECTED) | |
1674 | drbd_send_sync_param(mdev, &sc); | |
1675 | ||
1676 | if (!cpumask_equal(mdev->cpu_mask, new_cpu_mask)) { | |
1677 | cpumask_copy(mdev->cpu_mask, new_cpu_mask); | |
1678 | drbd_calc_cpu_mask(mdev); | |
1679 | mdev->receiver.reset_cpu_mask = 1; | |
1680 | mdev->asender.reset_cpu_mask = 1; | |
1681 | mdev->worker.reset_cpu_mask = 1; | |
1682 | } | |
1683 | ||
1684 | kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); | |
1685 | fail: | |
1686 | free_cpumask_var(new_cpu_mask); | |
1687 | crypto_free_hash(csums_tfm); | |
1688 | crypto_free_hash(verify_tfm); | |
1689 | reply->ret_code = retcode; | |
1690 | return 0; | |
1691 | } | |
1692 | ||
1693 | static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, | |
1694 | struct drbd_nl_cfg_reply *reply) | |
1695 | { | |
1696 | int retcode; | |
1697 | ||
1698 | retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED); | |
1699 | ||
1700 | if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION) | |
1701 | retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T)); | |
1702 | ||
1703 | while (retcode == SS_NEED_CONNECTION) { | |
1704 | spin_lock_irq(&mdev->req_lock); | |
1705 | if (mdev->state.conn < C_CONNECTED) | |
1706 | retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL); | |
1707 | spin_unlock_irq(&mdev->req_lock); | |
1708 | ||
1709 | if (retcode != SS_NEED_CONNECTION) | |
1710 | break; | |
1711 | ||
1712 | retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T)); | |
1713 | } | |
1714 | ||
1715 | reply->ret_code = retcode; | |
1716 | return 0; | |
1717 | } | |
1718 | ||
1719 | static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, | |
1720 | struct drbd_nl_cfg_reply *reply) | |
1721 | { | |
1722 | ||
1723 | reply->ret_code = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S)); | |
1724 | ||
1725 | return 0; | |
1726 | } | |
1727 | ||
1728 | static int drbd_nl_pause_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, | |
1729 | struct drbd_nl_cfg_reply *reply) | |
1730 | { | |
1731 | int retcode = NO_ERROR; | |
1732 | ||
1733 | if (drbd_request_state(mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO) | |
1734 | retcode = ERR_PAUSE_IS_SET; | |
1735 | ||
1736 | reply->ret_code = retcode; | |
1737 | return 0; | |
1738 | } | |
1739 | ||
1740 | static int drbd_nl_resume_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, | |
1741 | struct drbd_nl_cfg_reply *reply) | |
1742 | { | |
1743 | int retcode = NO_ERROR; | |
1744 | ||
1745 | if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO) | |
1746 | retcode = ERR_PAUSE_IS_CLEAR; | |
1747 | ||
1748 | reply->ret_code = retcode; | |
1749 | return 0; | |
1750 | } | |
1751 | ||
1752 | static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, | |
1753 | struct drbd_nl_cfg_reply *reply) | |
1754 | { | |
1755 | reply->ret_code = drbd_request_state(mdev, NS(susp, 1)); | |
1756 | ||
1757 | return 0; | |
1758 | } | |
1759 | ||
1760 | static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, | |
1761 | struct drbd_nl_cfg_reply *reply) | |
1762 | { | |
1763 | reply->ret_code = drbd_request_state(mdev, NS(susp, 0)); | |
1764 | return 0; | |
1765 | } | |
1766 | ||
1767 | static int drbd_nl_outdate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, | |
1768 | struct drbd_nl_cfg_reply *reply) | |
1769 | { | |
1770 | reply->ret_code = drbd_request_state(mdev, NS(disk, D_OUTDATED)); | |
1771 | return 0; | |
1772 | } | |
1773 | ||
1774 | static int drbd_nl_get_config(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, | |
1775 | struct drbd_nl_cfg_reply *reply) | |
1776 | { | |
1777 | unsigned short *tl; | |
1778 | ||
1779 | tl = reply->tag_list; | |
1780 | ||
1781 | if (get_ldev(mdev)) { | |
1782 | tl = disk_conf_to_tags(mdev, &mdev->ldev->dc, tl); | |
1783 | put_ldev(mdev); | |
1784 | } | |
1785 | ||
1786 | if (get_net_conf(mdev)) { | |
1787 | tl = net_conf_to_tags(mdev, mdev->net_conf, tl); | |
1788 | put_net_conf(mdev); | |
1789 | } | |
1790 | tl = syncer_conf_to_tags(mdev, &mdev->sync_conf, tl); | |
1791 | ||
1792 | put_unaligned(TT_END, tl++); /* Close the tag list */ | |
1793 | ||
1794 | return (int)((char *)tl - (char *)reply->tag_list); | |
1795 | } | |
1796 | ||
1797 | static int drbd_nl_get_state(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, | |
1798 | struct drbd_nl_cfg_reply *reply) | |
1799 | { | |
1800 | unsigned short *tl = reply->tag_list; | |
1801 | union drbd_state s = mdev->state; | |
1802 | unsigned long rs_left; | |
1803 | unsigned int res; | |
1804 | ||
1805 | tl = get_state_to_tags(mdev, (struct get_state *)&s, tl); | |
1806 | ||
1807 | /* no local ref, no bitmap, no syncer progress. */ | |
1808 | if (s.conn >= C_SYNC_SOURCE && s.conn <= C_PAUSED_SYNC_T) { | |
1809 | if (get_ldev(mdev)) { | |
1810 | drbd_get_syncer_progress(mdev, &rs_left, &res); | |
1811 | tl = tl_add_int(tl, T_sync_progress, &res); | |
1812 | put_ldev(mdev); | |
1813 | } | |
1814 | } | |
1815 | put_unaligned(TT_END, tl++); /* Close the tag list */ | |
1816 | ||
1817 | return (int)((char *)tl - (char *)reply->tag_list); | |
1818 | } | |
1819 | ||
1820 | static int drbd_nl_get_uuids(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, | |
1821 | struct drbd_nl_cfg_reply *reply) | |
1822 | { | |
1823 | unsigned short *tl; | |
1824 | ||
1825 | tl = reply->tag_list; | |
1826 | ||
1827 | if (get_ldev(mdev)) { | |
1828 | tl = tl_add_blob(tl, T_uuids, mdev->ldev->md.uuid, UI_SIZE*sizeof(u64)); | |
1829 | tl = tl_add_int(tl, T_uuids_flags, &mdev->ldev->md.flags); | |
1830 | put_ldev(mdev); | |
1831 | } | |
1832 | put_unaligned(TT_END, tl++); /* Close the tag list */ | |
1833 | ||
1834 | return (int)((char *)tl - (char *)reply->tag_list); | |
1835 | } | |
1836 | ||
1837 | /** | |
1838 | * drbd_nl_get_timeout_flag() - Used by drbdsetup to find out which timeout value to use | |
1839 | * @mdev: DRBD device. | |
1840 | * @nlp: Netlink/connector packet from drbdsetup | |
1841 | * @reply: Reply packet for drbdsetup | |
1842 | */ | |
1843 | static int drbd_nl_get_timeout_flag(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, | |
1844 | struct drbd_nl_cfg_reply *reply) | |
1845 | { | |
1846 | unsigned short *tl; | |
1847 | char rv; | |
1848 | ||
1849 | tl = reply->tag_list; | |
1850 | ||
1851 | rv = mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED : | |
1852 | test_bit(USE_DEGR_WFC_T, &mdev->flags) ? UT_DEGRADED : UT_DEFAULT; | |
1853 | ||
1854 | tl = tl_add_blob(tl, T_use_degraded, &rv, sizeof(rv)); | |
1855 | put_unaligned(TT_END, tl++); /* Close the tag list */ | |
1856 | ||
1857 | return (int)((char *)tl - (char *)reply->tag_list); | |
1858 | } | |
1859 | ||
1860 | static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, | |
1861 | struct drbd_nl_cfg_reply *reply) | |
1862 | { | |
1863 | /* default to resume from last known position, if possible */ | |
1864 | struct start_ov args = | |
1865 | { .start_sector = mdev->ov_start_sector }; | |
1866 | ||
1867 | if (!start_ov_from_tags(mdev, nlp->tag_list, &args)) { | |
1868 | reply->ret_code = ERR_MANDATORY_TAG; | |
1869 | return 0; | |
1870 | } | |
1871 | /* w_make_ov_request expects position to be aligned */ | |
1872 | mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT; | |
1873 | reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S)); | |
1874 | return 0; | |
1875 | } | |
1876 | ||
1877 | ||
1878 | static int drbd_nl_new_c_uuid(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, | |
1879 | struct drbd_nl_cfg_reply *reply) | |
1880 | { | |
1881 | int retcode = NO_ERROR; | |
1882 | int skip_initial_sync = 0; | |
1883 | int err; | |
1884 | ||
1885 | struct new_c_uuid args; | |
1886 | ||
1887 | memset(&args, 0, sizeof(struct new_c_uuid)); | |
1888 | if (!new_c_uuid_from_tags(mdev, nlp->tag_list, &args)) { | |
1889 | reply->ret_code = ERR_MANDATORY_TAG; | |
1890 | return 0; | |
1891 | } | |
1892 | ||
1893 | mutex_lock(&mdev->state_mutex); /* Protects us against serialized state changes. */ | |
1894 | ||
1895 | if (!get_ldev(mdev)) { | |
1896 | retcode = ERR_NO_DISK; | |
1897 | goto out; | |
1898 | } | |
1899 | ||
1900 | /* this is "skip initial sync", assume to be clean */ | |
1901 | if (mdev->state.conn == C_CONNECTED && mdev->agreed_pro_version >= 90 && | |
1902 | mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) { | |
1903 | dev_info(DEV, "Preparing to skip initial sync\n"); | |
1904 | skip_initial_sync = 1; | |
1905 | } else if (mdev->state.conn != C_STANDALONE) { | |
1906 | retcode = ERR_CONNECTED; | |
1907 | goto out_dec; | |
1908 | } | |
1909 | ||
1910 | drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */ | |
1911 | drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */ | |
1912 | ||
1913 | if (args.clear_bm) { | |
1914 | err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, "clear_n_write from new_c_uuid"); | |
1915 | if (err) { | |
1916 | dev_err(DEV, "Writing bitmap failed with %d\n",err); | |
1917 | retcode = ERR_IO_MD_DISK; | |
1918 | } | |
1919 | if (skip_initial_sync) { | |
1920 | drbd_send_uuids_skip_initial_sync(mdev); | |
1921 | _drbd_uuid_set(mdev, UI_BITMAP, 0); | |
1922 | spin_lock_irq(&mdev->req_lock); | |
1923 | _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), | |
1924 | CS_VERBOSE, NULL); | |
1925 | spin_unlock_irq(&mdev->req_lock); | |
1926 | } | |
1927 | } | |
1928 | ||
1929 | drbd_md_sync(mdev); | |
1930 | out_dec: | |
1931 | put_ldev(mdev); | |
1932 | out: | |
1933 | mutex_unlock(&mdev->state_mutex); | |
1934 | ||
1935 | reply->ret_code = retcode; | |
1936 | return 0; | |
1937 | } | |
1938 | ||
1939 | static struct drbd_conf *ensure_mdev(struct drbd_nl_cfg_req *nlp) | |
1940 | { | |
1941 | struct drbd_conf *mdev; | |
1942 | ||
1943 | if (nlp->drbd_minor >= minor_count) | |
1944 | return NULL; | |
1945 | ||
1946 | mdev = minor_to_mdev(nlp->drbd_minor); | |
1947 | ||
1948 | if (!mdev && (nlp->flags & DRBD_NL_CREATE_DEVICE)) { | |
1949 | struct gendisk *disk = NULL; | |
1950 | mdev = drbd_new_device(nlp->drbd_minor); | |
1951 | ||
1952 | spin_lock_irq(&drbd_pp_lock); | |
1953 | if (minor_table[nlp->drbd_minor] == NULL) { | |
1954 | minor_table[nlp->drbd_minor] = mdev; | |
1955 | disk = mdev->vdisk; | |
1956 | mdev = NULL; | |
1957 | } /* else: we lost the race */ | |
1958 | spin_unlock_irq(&drbd_pp_lock); | |
1959 | ||
1960 | if (disk) /* we won the race above */ | |
1961 | /* in case we ever add a drbd_delete_device(), | |
1962 | * don't forget the del_gendisk! */ | |
1963 | add_disk(disk); | |
1964 | else /* we lost the race above */ | |
1965 | drbd_free_mdev(mdev); | |
1966 | ||
1967 | mdev = minor_to_mdev(nlp->drbd_minor); | |
1968 | } | |
1969 | ||
1970 | return mdev; | |
1971 | } | |
1972 | ||
1973 | struct cn_handler_struct { | |
1974 | int (*function)(struct drbd_conf *, | |
1975 | struct drbd_nl_cfg_req *, | |
1976 | struct drbd_nl_cfg_reply *); | |
1977 | int reply_body_size; | |
1978 | }; | |
1979 | ||
1980 | static struct cn_handler_struct cnd_table[] = { | |
1981 | [ P_primary ] = { &drbd_nl_primary, 0 }, | |
1982 | [ P_secondary ] = { &drbd_nl_secondary, 0 }, | |
1983 | [ P_disk_conf ] = { &drbd_nl_disk_conf, 0 }, | |
1984 | [ P_detach ] = { &drbd_nl_detach, 0 }, | |
1985 | [ P_net_conf ] = { &drbd_nl_net_conf, 0 }, | |
1986 | [ P_disconnect ] = { &drbd_nl_disconnect, 0 }, | |
1987 | [ P_resize ] = { &drbd_nl_resize, 0 }, | |
1988 | [ P_syncer_conf ] = { &drbd_nl_syncer_conf, 0 }, | |
1989 | [ P_invalidate ] = { &drbd_nl_invalidate, 0 }, | |
1990 | [ P_invalidate_peer ] = { &drbd_nl_invalidate_peer, 0 }, | |
1991 | [ P_pause_sync ] = { &drbd_nl_pause_sync, 0 }, | |
1992 | [ P_resume_sync ] = { &drbd_nl_resume_sync, 0 }, | |
1993 | [ P_suspend_io ] = { &drbd_nl_suspend_io, 0 }, | |
1994 | [ P_resume_io ] = { &drbd_nl_resume_io, 0 }, | |
1995 | [ P_outdate ] = { &drbd_nl_outdate, 0 }, | |
1996 | [ P_get_config ] = { &drbd_nl_get_config, | |
1997 | sizeof(struct syncer_conf_tag_len_struct) + | |
1998 | sizeof(struct disk_conf_tag_len_struct) + | |
1999 | sizeof(struct net_conf_tag_len_struct) }, | |
2000 | [ P_get_state ] = { &drbd_nl_get_state, | |
2001 | sizeof(struct get_state_tag_len_struct) + | |
2002 | sizeof(struct sync_progress_tag_len_struct) }, | |
2003 | [ P_get_uuids ] = { &drbd_nl_get_uuids, | |
2004 | sizeof(struct get_uuids_tag_len_struct) }, | |
2005 | [ P_get_timeout_flag ] = { &drbd_nl_get_timeout_flag, | |
2006 | sizeof(struct get_timeout_flag_tag_len_struct)}, | |
2007 | [ P_start_ov ] = { &drbd_nl_start_ov, 0 }, | |
2008 | [ P_new_c_uuid ] = { &drbd_nl_new_c_uuid, 0 }, | |
2009 | }; | |
2010 | ||
9f5180e5 | 2011 | static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp) |
b411b363 PR |
2012 | { |
2013 | struct drbd_nl_cfg_req *nlp = (struct drbd_nl_cfg_req *)req->data; | |
2014 | struct cn_handler_struct *cm; | |
2015 | struct cn_msg *cn_reply; | |
2016 | struct drbd_nl_cfg_reply *reply; | |
2017 | struct drbd_conf *mdev; | |
2018 | int retcode, rr; | |
2019 | int reply_size = sizeof(struct cn_msg) | |
2020 | + sizeof(struct drbd_nl_cfg_reply) | |
2021 | + sizeof(short int); | |
2022 | ||
2023 | if (!try_module_get(THIS_MODULE)) { | |
2024 | printk(KERN_ERR "drbd: try_module_get() failed!\n"); | |
2025 | return; | |
2026 | } | |
2027 | ||
9f5180e5 PR |
2028 | if (!cap_raised(nsp->eff_cap, CAP_SYS_ADMIN)) { |
2029 | retcode = ERR_PERM; | |
2030 | goto fail; | |
2031 | } | |
2032 | ||
b411b363 PR |
2033 | mdev = ensure_mdev(nlp); |
2034 | if (!mdev) { | |
2035 | retcode = ERR_MINOR_INVALID; | |
2036 | goto fail; | |
2037 | } | |
2038 | ||
b411b363 PR |
2039 | if (nlp->packet_type >= P_nl_after_last_packet) { |
2040 | retcode = ERR_PACKET_NR; | |
2041 | goto fail; | |
2042 | } | |
2043 | ||
2044 | cm = cnd_table + nlp->packet_type; | |
2045 | ||
2046 | /* This may happen if packet number is 0: */ | |
2047 | if (cm->function == NULL) { | |
2048 | retcode = ERR_PACKET_NR; | |
2049 | goto fail; | |
2050 | } | |
2051 | ||
2052 | reply_size += cm->reply_body_size; | |
2053 | ||
2054 | /* allocation not in the IO path, cqueue thread context */ | |
2055 | cn_reply = kmalloc(reply_size, GFP_KERNEL); | |
2056 | if (!cn_reply) { | |
2057 | retcode = ERR_NOMEM; | |
2058 | goto fail; | |
2059 | } | |
2060 | reply = (struct drbd_nl_cfg_reply *) cn_reply->data; | |
2061 | ||
2062 | reply->packet_type = | |
2063 | cm->reply_body_size ? nlp->packet_type : P_nl_after_last_packet; | |
2064 | reply->minor = nlp->drbd_minor; | |
2065 | reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */ | |
2066 | /* reply->tag_list; might be modified by cm->function. */ | |
2067 | ||
2068 | rr = cm->function(mdev, nlp, reply); | |
2069 | ||
2070 | cn_reply->id = req->id; | |
2071 | cn_reply->seq = req->seq; | |
2072 | cn_reply->ack = req->ack + 1; | |
2073 | cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + rr; | |
2074 | cn_reply->flags = 0; | |
2075 | ||
b411b363 PR |
2076 | rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL); |
2077 | if (rr && rr != -ESRCH) | |
2078 | printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr); | |
2079 | ||
2080 | kfree(cn_reply); | |
2081 | module_put(THIS_MODULE); | |
2082 | return; | |
2083 | fail: | |
2084 | drbd_nl_send_reply(req, retcode); | |
2085 | module_put(THIS_MODULE); | |
2086 | } | |
2087 | ||
2088 | static atomic_t drbd_nl_seq = ATOMIC_INIT(2); /* two. */ | |
2089 | ||
2090 | static unsigned short * | |
2091 | __tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, | |
2092 | unsigned short len, int nul_terminated) | |
2093 | { | |
2094 | unsigned short l = tag_descriptions[tag_number(tag)].max_len; | |
2095 | len = (len < l) ? len : l; | |
2096 | put_unaligned(tag, tl++); | |
2097 | put_unaligned(len, tl++); | |
2098 | memcpy(tl, data, len); | |
2099 | tl = (unsigned short*)((char*)tl + len); | |
2100 | if (nul_terminated) | |
2101 | *((char*)tl - 1) = 0; | |
2102 | return tl; | |
2103 | } | |
2104 | ||
2105 | static unsigned short * | |
2106 | tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, int len) | |
2107 | { | |
2108 | return __tl_add_blob(tl, tag, data, len, 0); | |
2109 | } | |
2110 | ||
2111 | static unsigned short * | |
2112 | tl_add_str(unsigned short *tl, enum drbd_tags tag, const char *str) | |
2113 | { | |
2114 | return __tl_add_blob(tl, tag, str, strlen(str)+1, 0); | |
2115 | } | |
2116 | ||
2117 | static unsigned short * | |
2118 | tl_add_int(unsigned short *tl, enum drbd_tags tag, const void *val) | |
2119 | { | |
2120 | put_unaligned(tag, tl++); | |
2121 | switch(tag_type(tag)) { | |
2122 | case TT_INTEGER: | |
2123 | put_unaligned(sizeof(int), tl++); | |
2124 | put_unaligned(*(int *)val, (int *)tl); | |
2125 | tl = (unsigned short*)((char*)tl+sizeof(int)); | |
2126 | break; | |
2127 | case TT_INT64: | |
2128 | put_unaligned(sizeof(u64), tl++); | |
2129 | put_unaligned(*(u64 *)val, (u64 *)tl); | |
2130 | tl = (unsigned short*)((char*)tl+sizeof(u64)); | |
2131 | break; | |
2132 | default: | |
2133 | /* someone did something stupid. */ | |
2134 | ; | |
2135 | } | |
2136 | return tl; | |
2137 | } | |
2138 | ||
2139 | void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state state) | |
2140 | { | |
2141 | char buffer[sizeof(struct cn_msg)+ | |
2142 | sizeof(struct drbd_nl_cfg_reply)+ | |
2143 | sizeof(struct get_state_tag_len_struct)+ | |
2144 | sizeof(short int)]; | |
2145 | struct cn_msg *cn_reply = (struct cn_msg *) buffer; | |
2146 | struct drbd_nl_cfg_reply *reply = | |
2147 | (struct drbd_nl_cfg_reply *)cn_reply->data; | |
2148 | unsigned short *tl = reply->tag_list; | |
2149 | ||
2150 | /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */ | |
2151 | ||
2152 | tl = get_state_to_tags(mdev, (struct get_state *)&state, tl); | |
2153 | ||
2154 | put_unaligned(TT_END, tl++); /* Close the tag list */ | |
2155 | ||
2156 | cn_reply->id.idx = CN_IDX_DRBD; | |
2157 | cn_reply->id.val = CN_VAL_DRBD; | |
2158 | ||
2159 | cn_reply->seq = atomic_add_return(1, &drbd_nl_seq); | |
2160 | cn_reply->ack = 0; /* not used here. */ | |
2161 | cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + | |
2162 | (int)((char *)tl - (char *)reply->tag_list); | |
2163 | cn_reply->flags = 0; | |
2164 | ||
2165 | reply->packet_type = P_get_state; | |
2166 | reply->minor = mdev_to_minor(mdev); | |
2167 | reply->ret_code = NO_ERROR; | |
2168 | ||
b411b363 PR |
2169 | cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); |
2170 | } | |
2171 | ||
2172 | void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name) | |
2173 | { | |
2174 | char buffer[sizeof(struct cn_msg)+ | |
2175 | sizeof(struct drbd_nl_cfg_reply)+ | |
2176 | sizeof(struct call_helper_tag_len_struct)+ | |
2177 | sizeof(short int)]; | |
2178 | struct cn_msg *cn_reply = (struct cn_msg *) buffer; | |
2179 | struct drbd_nl_cfg_reply *reply = | |
2180 | (struct drbd_nl_cfg_reply *)cn_reply->data; | |
2181 | unsigned short *tl = reply->tag_list; | |
2182 | ||
2183 | /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */ | |
2184 | ||
2185 | tl = tl_add_str(tl, T_helper, helper_name); | |
2186 | put_unaligned(TT_END, tl++); /* Close the tag list */ | |
2187 | ||
2188 | cn_reply->id.idx = CN_IDX_DRBD; | |
2189 | cn_reply->id.val = CN_VAL_DRBD; | |
2190 | ||
2191 | cn_reply->seq = atomic_add_return(1, &drbd_nl_seq); | |
2192 | cn_reply->ack = 0; /* not used here. */ | |
2193 | cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + | |
2194 | (int)((char *)tl - (char *)reply->tag_list); | |
2195 | cn_reply->flags = 0; | |
2196 | ||
2197 | reply->packet_type = P_call_helper; | |
2198 | reply->minor = mdev_to_minor(mdev); | |
2199 | reply->ret_code = NO_ERROR; | |
2200 | ||
b411b363 PR |
2201 | cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); |
2202 | } | |
2203 | ||
2204 | void drbd_bcast_ee(struct drbd_conf *mdev, | |
2205 | const char *reason, const int dgs, | |
2206 | const char* seen_hash, const char* calc_hash, | |
2207 | const struct drbd_epoch_entry* e) | |
2208 | { | |
2209 | struct cn_msg *cn_reply; | |
2210 | struct drbd_nl_cfg_reply *reply; | |
2211 | struct bio_vec *bvec; | |
2212 | unsigned short *tl; | |
2213 | int i; | |
2214 | ||
2215 | if (!e) | |
2216 | return; | |
2217 | if (!reason || !reason[0]) | |
2218 | return; | |
2219 | ||
2220 | /* apparently we have to memcpy twice, first to prepare the data for the | |
2221 | * struct cn_msg, then within cn_netlink_send from the cn_msg to the | |
2222 | * netlink skb. */ | |
2223 | /* receiver thread context, which is not in the writeout path (of this node), | |
2224 | * but may be in the writeout path of the _other_ node. | |
2225 | * GFP_NOIO to avoid potential "distributed deadlock". */ | |
2226 | cn_reply = kmalloc( | |
2227 | sizeof(struct cn_msg)+ | |
2228 | sizeof(struct drbd_nl_cfg_reply)+ | |
2229 | sizeof(struct dump_ee_tag_len_struct)+ | |
2230 | sizeof(short int), | |
2231 | GFP_NOIO); | |
2232 | ||
2233 | if (!cn_reply) { | |
2234 | dev_err(DEV, "could not kmalloc buffer for drbd_bcast_ee, sector %llu, size %u\n", | |
2235 | (unsigned long long)e->sector, e->size); | |
2236 | return; | |
2237 | } | |
2238 | ||
2239 | reply = (struct drbd_nl_cfg_reply*)cn_reply->data; | |
2240 | tl = reply->tag_list; | |
2241 | ||
2242 | tl = tl_add_str(tl, T_dump_ee_reason, reason); | |
2243 | tl = tl_add_blob(tl, T_seen_digest, seen_hash, dgs); | |
2244 | tl = tl_add_blob(tl, T_calc_digest, calc_hash, dgs); | |
2245 | tl = tl_add_int(tl, T_ee_sector, &e->sector); | |
2246 | tl = tl_add_int(tl, T_ee_block_id, &e->block_id); | |
2247 | ||
2248 | put_unaligned(T_ee_data, tl++); | |
2249 | put_unaligned(e->size, tl++); | |
2250 | ||
2251 | __bio_for_each_segment(bvec, e->private_bio, i, 0) { | |
2252 | void *d = kmap(bvec->bv_page); | |
2253 | memcpy(tl, d + bvec->bv_offset, bvec->bv_len); | |
2254 | kunmap(bvec->bv_page); | |
2255 | tl=(unsigned short*)((char*)tl + bvec->bv_len); | |
2256 | } | |
2257 | put_unaligned(TT_END, tl++); /* Close the tag list */ | |
2258 | ||
2259 | cn_reply->id.idx = CN_IDX_DRBD; | |
2260 | cn_reply->id.val = CN_VAL_DRBD; | |
2261 | ||
2262 | cn_reply->seq = atomic_add_return(1,&drbd_nl_seq); | |
2263 | cn_reply->ack = 0; // not used here. | |
2264 | cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + | |
2265 | (int)((char*)tl - (char*)reply->tag_list); | |
2266 | cn_reply->flags = 0; | |
2267 | ||
2268 | reply->packet_type = P_dump_ee; | |
2269 | reply->minor = mdev_to_minor(mdev); | |
2270 | reply->ret_code = NO_ERROR; | |
2271 | ||
b411b363 PR |
2272 | cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); |
2273 | kfree(cn_reply); | |
2274 | } | |
2275 | ||
2276 | void drbd_bcast_sync_progress(struct drbd_conf *mdev) | |
2277 | { | |
2278 | char buffer[sizeof(struct cn_msg)+ | |
2279 | sizeof(struct drbd_nl_cfg_reply)+ | |
2280 | sizeof(struct sync_progress_tag_len_struct)+ | |
2281 | sizeof(short int)]; | |
2282 | struct cn_msg *cn_reply = (struct cn_msg *) buffer; | |
2283 | struct drbd_nl_cfg_reply *reply = | |
2284 | (struct drbd_nl_cfg_reply *)cn_reply->data; | |
2285 | unsigned short *tl = reply->tag_list; | |
2286 | unsigned long rs_left; | |
2287 | unsigned int res; | |
2288 | ||
2289 | /* no local ref, no bitmap, no syncer progress, no broadcast. */ | |
2290 | if (!get_ldev(mdev)) | |
2291 | return; | |
2292 | drbd_get_syncer_progress(mdev, &rs_left, &res); | |
2293 | put_ldev(mdev); | |
2294 | ||
2295 | tl = tl_add_int(tl, T_sync_progress, &res); | |
2296 | put_unaligned(TT_END, tl++); /* Close the tag list */ | |
2297 | ||
2298 | cn_reply->id.idx = CN_IDX_DRBD; | |
2299 | cn_reply->id.val = CN_VAL_DRBD; | |
2300 | ||
2301 | cn_reply->seq = atomic_add_return(1, &drbd_nl_seq); | |
2302 | cn_reply->ack = 0; /* not used here. */ | |
2303 | cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + | |
2304 | (int)((char *)tl - (char *)reply->tag_list); | |
2305 | cn_reply->flags = 0; | |
2306 | ||
2307 | reply->packet_type = P_sync_progress; | |
2308 | reply->minor = mdev_to_minor(mdev); | |
2309 | reply->ret_code = NO_ERROR; | |
2310 | ||
b411b363 PR |
2311 | cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); |
2312 | } | |
2313 | ||
2314 | int __init drbd_nl_init(void) | |
2315 | { | |
2316 | static struct cb_id cn_id_drbd; | |
2317 | int err, try=10; | |
2318 | ||
2319 | cn_id_drbd.val = CN_VAL_DRBD; | |
2320 | do { | |
2321 | cn_id_drbd.idx = cn_idx; | |
2322 | err = cn_add_callback(&cn_id_drbd, "cn_drbd", &drbd_connector_callback); | |
2323 | if (!err) | |
2324 | break; | |
2325 | cn_idx = (cn_idx + CN_IDX_STEP); | |
2326 | } while (try--); | |
2327 | ||
2328 | if (err) { | |
2329 | printk(KERN_ERR "drbd: cn_drbd failed to register\n"); | |
2330 | return err; | |
2331 | } | |
2332 | ||
2333 | return 0; | |
2334 | } | |
2335 | ||
2336 | void drbd_nl_cleanup(void) | |
2337 | { | |
2338 | static struct cb_id cn_id_drbd; | |
2339 | ||
2340 | cn_id_drbd.idx = cn_idx; | |
2341 | cn_id_drbd.val = CN_VAL_DRBD; | |
2342 | ||
2343 | cn_del_callback(&cn_id_drbd); | |
2344 | } | |
2345 | ||
2346 | void drbd_nl_send_reply(struct cn_msg *req, int ret_code) | |
2347 | { | |
2348 | char buffer[sizeof(struct cn_msg)+sizeof(struct drbd_nl_cfg_reply)]; | |
2349 | struct cn_msg *cn_reply = (struct cn_msg *) buffer; | |
2350 | struct drbd_nl_cfg_reply *reply = | |
2351 | (struct drbd_nl_cfg_reply *)cn_reply->data; | |
2352 | int rr; | |
2353 | ||
2354 | cn_reply->id = req->id; | |
2355 | ||
2356 | cn_reply->seq = req->seq; | |
2357 | cn_reply->ack = req->ack + 1; | |
2358 | cn_reply->len = sizeof(struct drbd_nl_cfg_reply); | |
2359 | cn_reply->flags = 0; | |
2360 | ||
2361 | reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor; | |
2362 | reply->ret_code = ret_code; | |
2363 | ||
b411b363 PR |
2364 | rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO); |
2365 | if (rr && rr != -ESRCH) | |
2366 | printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr); | |
2367 | } | |
2368 |