Move calls to SET_ARRAY_INFO to common helper.
[thirdparty/mdadm.git] / Assemble.c
CommitLineData
64c4757e 1/*
9a9dab36 2 * mdadm - manage Linux "md" devices aka RAID arrays.
64c4757e 3 *
4f589ad0 4 * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
64c4757e
NB
5 *
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 * Author: Neil Brown
22 * Email: <neilb@cse.unsw.edu.au>
23 * Paper: Neil Brown
24 * School of Computer Science and Engineering
25 * The University of New South Wales
26 * Sydney, 2052
27 * Australia
28 */
29
9a9dab36 30#include "mdadm.h"
41a3b72a 31#include <ctype.h>
64c4757e 32
624920bb
NB
33static int name_matches(char *found, char *required, char *homehost)
34{
35 /* See if the name found matches the required name, possibly
36 * prefixed with 'homehost'
37 */
38 char fnd[33];
39
40 strncpy(fnd, found, 32);
41 fnd[32] = 0;
42 if (strcmp(found, required)==0)
43 return 1;
44 if (homehost) {
45 int l = strlen(homehost);
46 if (l < 32 && fnd[l] == ':' &&
47 strcmp(fnd+l+1, required)==0)
48 return 1;
49 }
50 return 0;
51}
52
82d9eba6 53int Assemble(struct supertype *st, char *mddev, int mdfd,
8aec876d 54 mddev_ident_t ident,
06b0d786 55 mddev_dev_t devlist, char *backup_file,
64c4757e 56 int readonly, int runstop,
e5eac01f 57 char *update, char *homehost,
64c4757e
NB
58 int verbose, int force)
59{
60 /*
52826846
NB
61 * The task of Assemble is to find a collection of
62 * devices that should (according to their superblocks)
63 * form an array, and to give this collection to the MD driver.
64 * In Linux-2.4 and later, this involves submitting a
64c4757e
NB
65 * SET_ARRAY_INFO ioctl with no arg - to prepare
66 * the array - and then submit a number of
67 * ADD_NEW_DISK ioctls to add disks into
68 * the array. Finally RUN_ARRAY might
69 * be submitted to start the array.
70 *
71 * Much of the work of Assemble is in finding and/or
72 * checking the disks to make sure they look right.
73 *
4b1ac34b 74 * If mddev is not set, then scan must be set and we
64c4757e
NB
75 * read through the config file for dev+uuid mapping
76 * We recurse, setting mddev, for each device that
77 * - isn't running
4b1ac34b 78 * - has a valid uuid (or any uuid if !uuidset)
64c4757e
NB
79 *
80 * If mddev is set, we try to determine state of md.
81 * check version - must be at least 0.90.0
82 * check kernel version. must be at least 2.4.
83 * If not, we can possibly fall back on START_ARRAY
84 * Try to GET_ARRAY_INFO.
85 * If possible, give up
86 * If not, try to STOP_ARRAY just to make sure
87 *
88 * If !uuidset and scan, look in conf-file for uuid
89 * If not found, give up
b8a8ccf9 90 * If !devlist and scan and uuidset, get list of devs from conf-file
64c4757e
NB
91 *
92 * For each device:
93 * Check superblock - discard if bad
94 * Check uuid (set if we don't have one) - discard if no match
5787fa49 95 * Check superblock similarity if we have a superblock - discard if different
4b1ac34b 96 * Record events, devicenum
64c4757e 97 * This should give us a list of devices for the array
4b1ac34b 98 * We should collect the most recent event number
64c4757e
NB
99 *
100 * Count disks with recent enough event count
101 * While force && !enough disks
102 * Choose newest rejected disks, update event count
103 * mark clean and rewrite superblock
104 * If recent kernel:
105 * SET_ARRAY_INFO
106 * foreach device with recent events : ADD_NEW_DISK
107 * if runstop == 1 || "enough" disks and runstop==0 -> RUN_ARRAY
108 * If old kernel:
109 * Check the device numbers in superblock are right
110 * update superblock if any changes
111 * START_ARRAY
112 *
113 */
583315d9 114 int clean = 0;
d55e3aef 115 int must_close = 0;
64c4757e 116 int old_linux = 0;
41a3b72a 117 int vers = 0; /* Keep gcc quite - it really is initialised */
64c4757e
NB
118 struct {
119 char *devname;
213ee40b
NB
120 int uptodate; /* set once we decide that this device is as
121 * recent as everything else in the array.
122 */
123 struct mdinfo i;
5787fa49 124 } *devices;
56eedc1a 125 int *best = NULL; /* indexed by raid_disk */
98c6faba
NB
126 unsigned int bestcnt = 0;
127 int devcnt = 0;
128 unsigned int okcnt, sparecnt;
129 unsigned int req_cnt;
130 unsigned int i;
64c4757e 131 int most_recent = 0;
cd29a5c8 132 int chosen_drive;
52826846 133 int change = 0;
cd29a5c8 134 int inargv = 0;
bf4fb153 135 int bitmap_done;
589395d6 136 int start_partial_ok = (runstop >= 0) && (force || devlist==NULL || mdfd < 0);
98c6faba 137 unsigned int num_devs;
5787fa49 138 mddev_dev_t tmpdev;
4b1ac34b 139 struct mdinfo info;
265e0f17 140 char *avail;
308e1801 141 int nextspare = 0;
8a46fe84 142
f35f2525
N
143 memset(&info, 0, sizeof(info));
144
682c7051 145 if (get_linux_version() < 2004000)
64c4757e
NB
146 old_linux = 1;
147
8a46fe84
NB
148 if (mdfd >= 0) {
149 vers = md_get_version(mdfd);
150 if (vers <= 0) {
151 fprintf(stderr, Name ": %s appears not to be an md device.\n", mddev);
152 return 1;
153 }
154 if (vers < 9000) {
155 fprintf(stderr, Name ": Assemble requires driver version 0.90.0 or later.\n"
156 " Upgrade your kernel or try --build\n");
157 return 1;
158 }
64c4757e 159
8a46fe84
NB
160 if (ioctl(mdfd, GET_ARRAY_INFO, &info.array)>=0) {
161 fprintf(stderr, Name ": device %s already active - cannot assemble it\n",
162 mddev);
163 return 1;
164 }
165 ioctl(mdfd, STOP_ARRAY, NULL); /* just incase it was started but has no content */
166 }
64c4757e 167 /*
52826846
NB
168 * If any subdevs are listed, then any that don't
169 * match ident are discarded. Remainder must all match and
170 * become the array.
171 * If no subdevs, then we scan all devices in the config file, but
172 * there must be something in the identity
64c4757e 173 */
64c4757e 174
cd29a5c8 175 if (!devlist &&
52826846
NB
176 ident->uuid_set == 0 &&
177 ident->super_minor < 0 &&
178 ident->devices == NULL) {
179 fprintf(stderr, Name ": No identity information available for %s - cannot assemble.\n",
8a46fe84 180 mddev ? mddev : "further assembly");
52826846 181 return 1;
64c4757e 182 }
cd29a5c8 183 if (devlist == NULL)
8aec876d 184 devlist = conf_get_devs();
da6b5ca9
NB
185 else if (mdfd >= 0)
186 inargv = 1;
64c4757e 187
60e1bc1a
NB
188 try_again:
189
5787fa49
NB
190 tmpdev = devlist; num_devs = 0;
191 while (tmpdev) {
da6b5ca9
NB
192 if (tmpdev->used)
193 tmpdev->used = 2;
194 else
195 num_devs++;
5787fa49
NB
196 tmpdev = tmpdev->next;
197 }
5787fa49
NB
198 devices = malloc(num_devs * sizeof(*devices));
199
82d9eba6 200 if (!st && ident->st) st = ident->st;
64c4757e 201
dab6685f 202 if (verbose>0)
82b27616 203 fprintf(stderr, Name ": looking for devices for %s\n",
8a46fe84 204 mddev ? mddev : "further assembly");
82b27616 205
811e6cbe
NB
206 /* first walk the list of devices to find a consistent set
207 * that match the criterea, if that is possible.
208 * We flag the one we like with 'used'.
209 */
210 for (tmpdev = devlist;
211 tmpdev;
212 tmpdev = tmpdev->next) {
213 char *devname = tmpdev->devname;
64c4757e
NB
214 int dfd;
215 struct stat stb;
3da92f27 216 struct supertype *tst = dup_super(st);
52826846 217
da6b5ca9
NB
218 if (tmpdev->used > 1) continue;
219
52826846 220 if (ident->devices &&
56eedc1a 221 !match_oneof(ident->devices, devname)) {
6a41304b 222 if ((inargv && verbose>=0) || verbose > 0)
56eedc1a 223 fprintf(stderr, Name ": %s is not one of %s\n", devname, ident->devices);
52826846 224 continue;
56eedc1a 225 }
4b1ac34b 226
8b0dabea 227 dfd = dev_open(devname, O_RDONLY|O_EXCL);
64c4757e 228 if (dfd < 0) {
6a41304b 229 if ((inargv && verbose >= 0) || verbose > 0)
682c7051 230 fprintf(stderr, Name ": cannot open device %s: %s\n",
64c4757e 231 devname, strerror(errno));
da6b5ca9 232 tmpdev->used = 2;
52826846
NB
233 } else if (fstat(dfd, &stb)< 0) {
234 /* Impossible! */
235 fprintf(stderr, Name ": fstat failed for %s: %s\n",
236 devname, strerror(errno));
da6b5ca9 237 tmpdev->used = 2;
cd29a5c8
NB
238 } else if ((stb.st_mode & S_IFMT) != S_IFBLK) {
239 fprintf(stderr, Name ": %s is not a block device.\n",
52826846 240 devname);
da6b5ca9 241 tmpdev->used = 2;
82d9eba6 242 } else if (!tst && (tst = guess_super(dfd)) == NULL) {
6a41304b 243 if ((inargv && verbose >= 0) || verbose > 0)
da6b5ca9
NB
244 fprintf(stderr, Name ": no recogniseable superblock on %s\n",
245 devname);
246 tmpdev->used = 2;
3da92f27 247 } else if (tst->ss->load_super(tst,dfd, NULL)) {
6a41304b 248 if ((inargv && verbose >= 0) || verbose > 0)
682c7051 249 fprintf( stderr, Name ": no RAID superblock on %s\n",
64c4757e 250 devname);
52826846 251 } else {
3da92f27 252 tst->ss->getinfo_super(tst, &info);
64c4757e 253 }
c06487ce 254 if (dfd >= 0) close(dfd);
52826846 255
838acbc2 256 if (ident->uuid_set && (!update || strcmp(update, "uuid")!= 0) &&
3da92f27
NB
257 (!tst || !tst->sb ||
258 same_uuid(info.uuid, ident->uuid, tst->ss->swapuuid)==0)) {
6a41304b 259 if ((inargv && verbose >= 0) || verbose > 0)
52826846
NB
260 fprintf(stderr, Name ": %s has wrong uuid.\n",
261 devname);
df37ffc0 262 goto loop;
82b27616 263 }
c4f12c13 264 if (ident->name[0] && (!update || strcmp(update, "name")!= 0) &&
3da92f27
NB
265 (!tst || !tst->sb ||
266 name_matches(info.name, ident->name, homehost)==0)) {
6a41304b 267 if ((inargv && verbose >= 0) || verbose > 0)
947fd4dd
NB
268 fprintf(stderr, Name ": %s has wrong name.\n",
269 devname);
df37ffc0 270 goto loop;
947fd4dd 271 }
98c6faba 272 if (ident->super_minor != UnSet &&
3da92f27
NB
273 (!tst || !tst->sb ||
274 ident->super_minor != info.array.md_minor)) {
6a41304b 275 if ((inargv && verbose >= 0) || verbose > 0)
52826846 276 fprintf(stderr, Name ": %s has wrong super-minor.\n",
64c4757e 277 devname);
df37ffc0 278 goto loop;
64c4757e 279 }
98c6faba 280 if (ident->level != UnSet &&
3da92f27
NB
281 (!tst || !tst->sb ||
282 ident->level != info.array.level)) {
6a41304b 283 if ((inargv && verbose >= 0) || verbose > 0)
cd29a5c8
NB
284 fprintf(stderr, Name ": %s has wrong raid level.\n",
285 devname);
df37ffc0 286 goto loop;
cd29a5c8 287 }
98c6faba 288 if (ident->raid_disks != UnSet &&
3da92f27
NB
289 (!tst || !tst->sb ||
290 ident->raid_disks!= info.array.raid_disks)) {
6a41304b 291 if ((inargv && verbose >= 0) || verbose > 0)
cd29a5c8
NB
292 fprintf(stderr, Name ": %s requires wrong number of drives.\n",
293 devname);
df37ffc0 294 goto loop;
cd29a5c8 295 }
da6b5ca9 296 if (mdfd < 0) {
3da92f27 297 if (tst == NULL || tst->sb == NULL)
da6b5ca9 298 continue;
589395d6 299 if (update == NULL &&
3da92f27 300 tst->ss->match_home(tst, homehost)==0) {
da6b5ca9
NB
301 if ((inargv && verbose >= 0) || verbose > 0)
302 fprintf(stderr, Name ": %s is not built for host %s.\n",
303 devname, homehost);
304 /* Auto-assemble, and this is not a usable host */
589395d6
NB
305 /* if update != NULL, we are updating the host
306 * name... */
df37ffc0 307 goto loop;
da6b5ca9
NB
308 }
309 }
83b6208e 310 /* If we are this far, then we are nearly commited to this device.
52826846 311 * If the super_block doesn't exist, or doesn't match others,
83b6208e
NB
312 * then we probably cannot continue
313 * However if one of the arrays is for the homehost, and
314 * the other isn't that can disambiguate.
52826846 315 */
52826846 316
3da92f27 317 if (!tst || !tst->sb) {
52826846
NB
318 fprintf(stderr, Name ": %s has no superblock - assembly aborted\n",
319 devname);
ddd1a492
NB
320 if (st)
321 st->ss->free_super(st);
52826846
NB
322 return 1;
323 }
838acbc2 324
83b6208e 325 if (st == NULL)
3da92f27
NB
326 st = dup_super(tst);
327 if (st->minor_version == -1)
328 st->minor_version = tst->minor_version;
83b6208e
NB
329 if (st->ss != tst->ss ||
330 st->minor_version != tst->minor_version ||
64557c33 331 st->ss->compare_super(st, tst) != 0) {
83b6208e 332 /* Some mismatch. If exactly one array matches this host,
da6b5ca9
NB
333 * we can resolve on that one.
334 * Or, if we are auto assembling, we just ignore the second
335 * for now.
83b6208e 336 */
da6b5ca9 337 if (mdfd < 0)
df37ffc0 338 goto loop;
83b6208e 339 if (homehost) {
3da92f27
NB
340 int first = st->ss->match_home(st, homehost);
341 int last = tst->ss->match_home(tst, homehost);
83b6208e
NB
342 if (first+last == 1) {
343 /* We can do something */
344 if (first) {/* just ignore this one */
345 if ((inargv && verbose >= 0) || verbose > 0)
346 fprintf(stderr, Name ": %s misses out due to wrong homehost\n",
347 devname);
df37ffc0 348 goto loop;
83b6208e
NB
349 } else { /* reject all those sofar */
350 mddev_dev_t td;
351 if ((inargv && verbose >= 0) || verbose > 0)
352 fprintf(stderr, Name ": %s overrides previous devices due to good homehost\n",
353 devname);
354 for (td=devlist; td != tmpdev; td=td->next)
355 if (td->used == 1)
356 td->used = 0;
357 tmpdev->used = 1;
df37ffc0 358 goto loop;
83b6208e
NB
359 }
360 }
361 }
52826846
NB
362 fprintf(stderr, Name ": superblock on %s doesn't match others - assembly aborted\n",
363 devname);
3da92f27
NB
364 tst->ss->free_super(tst);
365 st->ss->free_super(st);
52826846 366 return 1;
64c4757e
NB
367 }
368
811e6cbe 369 tmpdev->used = 1;
df37ffc0
NB
370
371 loop:
3d2b16e7
NB
372 if (tst)
373 tst->ss->free_super(tst);
811e6cbe
NB
374 }
375
8a46fe84
NB
376 if (mdfd < 0) {
377 /* So... it is up to me to open the device.
378 * We create a name '/dev/md/XXX' based on the info in the
379 * superblock, and call open_mddev on that
380 */
da6b5ca9
NB
381 mdu_array_info_t inf;
382 char *c;
1c203a4b 383 if (!st || !st->sb) {
d55e3aef 384 return 2;
da6b5ca9 385 }
3da92f27 386 st->ss->getinfo_super(st, &info);
da6b5ca9
NB
387 c = strchr(info.name, ':');
388 if (c) c++; else c= info.name;
41a3b72a
NB
389 if (isdigit(*c) && ((ident->autof & 7)==4 || (ident->autof&7)==6))
390 /* /dev/md/d0 style for partitionable */
391 asprintf(&mddev, "/dev/md/d%s", c);
392 else
393 asprintf(&mddev, "/dev/md/%s", c);
da6b5ca9 394 mdfd = open_mddev(mddev, ident->autof);
60e1bc1a 395 if (mdfd < 0) {
3da92f27 396 st->ss->free_super(st);
60e1bc1a 397 free(devices);
60e1bc1a
NB
398 goto try_again;
399 }
da6b5ca9
NB
400 vers = md_get_version(mdfd);
401 if (ioctl(mdfd, GET_ARRAY_INFO, &inf)==0) {
60e1bc1a
NB
402 for (tmpdev = devlist ;
403 tmpdev && tmpdev->used != 1;
404 tmpdev = tmpdev->next)
405 ;
da6b5ca9 406 fprintf(stderr, Name ": %s already active, cannot restart it!\n", mddev);
60e1bc1a
NB
407 if (tmpdev)
408 fprintf(stderr, Name ": %s needed for %s...\n",
409 mddev, tmpdev->devname);
da6b5ca9 410 close(mdfd);
60e1bc1a 411 mdfd = -1;
3da92f27 412 st->ss->free_super(st);
60e1bc1a 413 free(devices);
60e1bc1a 414 goto try_again;
da6b5ca9 415 }
d55e3aef 416 must_close = 1;
8a46fe84
NB
417 }
418
811e6cbe 419 /* Ok, no bad inconsistancy, we can try updating etc */
bf4fb153 420 bitmap_done = 0;
da6b5ca9 421 for (tmpdev = devlist; tmpdev; tmpdev=tmpdev->next) if (tmpdev->used == 1) {
811e6cbe
NB
422 char *devname = tmpdev->devname;
423 struct stat stb;
5787fa49 424 /* looks like a good enough match to update the super block if needed */
d1f1011b 425#ifndef MDASSEMBLE
5787fa49 426 if (update) {
811e6cbe 427 int dfd;
4b1ac34b
NB
428 /* prepare useful information in info structures */
429 struct stat stb2;
3da92f27 430 struct supertype *tst;
4b1ac34b 431 fstat(mdfd, &stb2);
7d99579f
NB
432
433 if (strcmp(update, "uuid")==0 &&
434 !ident->uuid_set) {
435 int rfd;
436 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
437 read(rfd, ident->uuid, 16) != 16) {
438 *(__u32*)(ident->uuid) = random();
439 *(__u32*)(ident->uuid+1) = random();
440 *(__u32*)(ident->uuid+2) = random();
441 *(__u32*)(ident->uuid+3) = random();
442 }
443 if (rfd >= 0) close(rfd);
7d99579f 444 }
811e6cbe
NB
445 dfd = dev_open(devname, O_RDWR|O_EXCL);
446
0430ed48
NB
447 remove_partitions(dfd);
448
3da92f27
NB
449 tst = dup_super(st);
450 tst->ss->load_super(tst, dfd, NULL);
451 tst->ss->getinfo_super(tst, &info);
811e6cbe 452
7d99579f 453 memcpy(info.uuid, ident->uuid, 16);
e5eac01f 454 strcpy(info.name, ident->name);
811e6cbe
NB
455 info.array.md_minor = minor(stb2.st_rdev);
456
3da92f27
NB
457 tst->ss->update_super(tst, &info, update,
458 devname, verbose,
459 ident->uuid_set, homehost);
e5eac01f
NB
460 if (strcmp(update, "uuid")==0 &&
461 !ident->uuid_set) {
462 ident->uuid_set = 1;
463 memcpy(ident->uuid, info.uuid, 16);
464 }
b8a8ccf9 465 if (dfd < 0)
5787fa49
NB
466 fprintf(stderr, Name ": Cannot open %s for superblock update\n",
467 devname);
3da92f27 468 else if (tst->ss->store_super(tst, dfd))
5787fa49
NB
469 fprintf(stderr, Name ": Could not re-write superblock on %s.\n",
470 devname);
471 if (dfd >= 0)
472 close(dfd);
8131b493
NB
473
474 if (strcmp(update, "uuid")==0 &&
bf4fb153 475 ident->bitmap_fd >= 0 && !bitmap_done) {
3da92f27
NB
476 if (bitmap_update_uuid(ident->bitmap_fd,
477 info.uuid,
478 tst->ss->swapuuid) != 0)
bf4fb153
NB
479 fprintf(stderr, Name ": Could not update uuid on external bitmap.\n");
480 else
481 bitmap_done = 1;
482 }
3da92f27 483 tst->ss->free_super(tst);
d1f1011b
NB
484 } else
485#endif
486 {
30e1b9a5 487 struct supertype *tst = dup_super(st);
da6b5ca9
NB
488 int dfd;
489 dfd = dev_open(devname, O_RDWR|O_EXCL);
490
0430ed48
NB
491 remove_partitions(dfd);
492
3da92f27
NB
493 tst->ss->load_super(tst, dfd, NULL);
494 tst->ss->getinfo_super(tst, &info);
495 tst->ss->free_super(tst);
da6b5ca9 496 close(dfd);
5787fa49
NB
497 }
498
811e6cbe
NB
499 stat(devname, &stb);
500
dab6685f 501 if (verbose > 0)
cd29a5c8 502 fprintf(stderr, Name ": %s is identified as a member of %s, slot %d.\n",
4b1ac34b 503 devname, mddev, info.disk.raid_disk);
64c4757e 504 devices[devcnt].devname = devname;
64c4757e 505 devices[devcnt].uptodate = 0;
213ee40b
NB
506 devices[devcnt].i = info;
507 devices[devcnt].i.disk.major = major(stb.st_rdev);
508 devices[devcnt].i.disk.minor = minor(stb.st_rdev);
64c4757e 509 if (most_recent < devcnt) {
213ee40b
NB
510 if (devices[devcnt].i.events
511 > devices[most_recent].i.events)
64c4757e
NB
512 most_recent = devcnt;
513 }
b8a8ccf9 514 if (info.array.level == -4)
5787fa49
NB
515 /* with multipath, the raid_disk from the superblock is meaningless */
516 i = devcnt;
517 else
213ee40b 518 i = devices[devcnt].i.disk.raid_disk;
308e1801
NB
519 if (i+1 == 0) {
520 if (nextspare < info.array.raid_disks)
521 nextspare = info.array.raid_disks;
522 i = nextspare++;
08110d41
NB
523 } else {
524 if (i >= info.array.raid_disks &&
525 i >= nextspare)
526 nextspare = i+1;
308e1801 527 }
98c6faba 528 if (i < 10000) {
56eedc1a 529 if (i >= bestcnt) {
98c6faba 530 unsigned int newbestcnt = i+10;
56eedc1a 531 int *newbest = malloc(sizeof(int)*newbestcnt);
98c6faba 532 unsigned int c;
56eedc1a
NB
533 for (c=0; c < newbestcnt; c++)
534 if (c < bestcnt)
535 newbest[c] = best[c];
536 else
537 newbest[c] = -1;
538 if (best)free(best);
539 best = newbest;
540 bestcnt = newbestcnt;
541 }
6a255b69 542 if (best[i] >=0 &&
213ee40b
NB
543 devices[best[i]].i.events
544 == devices[devcnt].i.events
545 && (devices[best[i]].i.disk.minor
546 != devices[devcnt].i.disk.minor)
b8ac1967
NB
547 && st->ss == &super0
548 && info.array.level != LEVEL_MULTIPATH) {
6a255b69
NB
549 /* two different devices with identical superblock.
550 * Could be a mis-detection caused by overlapping
551 * partitions. fail-safe.
552 */
553 fprintf(stderr, Name ": WARNING %s and %s appear"
554 " to have very similar superblocks.\n"
555 " If they are really different, "
556 "please --zero the superblock on one\n"
d2df86e0
NB
557 " If they are the same or overlap,"
558 " please remove one from %s.\n",
559 devices[best[i]].devname, devname,
560 inargv ? "the list" :
561 "the\n DEVICE list in mdadm.conf"
562 );
6a255b69
NB
563 if (must_close) close(mdfd);
564 return 1;
565 }
52826846 566 if (best[i] == -1
213ee40b
NB
567 || (devices[best[i]].i.events
568 < devices[devcnt].i.events))
52826846 569 best[i] = devcnt;
56eedc1a 570 }
64c4757e 571 devcnt++;
df37ffc0 572 }
4b1ac34b 573
64c4757e 574 if (devcnt == 0) {
682c7051 575 fprintf(stderr, Name ": no devices found for %s\n",
64c4757e 576 mddev);
3d2b16e7
NB
577 if (st)
578 st->ss->free_super(st);
d55e3aef 579 if (must_close) close(mdfd);
64c4757e
NB
580 return 1;
581 }
4b1ac34b 582
3d2b16e7
NB
583 if (update && strcmp(update, "byteorder")==0)
584 st->minor_version = 90;
585
3da92f27 586 st->ss->getinfo_super(st, &info);
583315d9 587 clean = info.array.state & 1;
4b1ac34b 588
64c4757e
NB
589 /* now we have some devices that might be suitable.
590 * I wonder how many
591 */
265e0f17
NB
592 avail = malloc(info.array.raid_disks);
593 memset(avail, 0, info.array.raid_disks);
64c4757e 594 okcnt = 0;
52826846 595 sparecnt=0;
56eedc1a 596 for (i=0; i< bestcnt ;i++) {
64c4757e 597 int j = best[i];
ee04451c
NB
598 int event_margin = 1; /* always allow a difference of '1'
599 * like the kernel does
600 */
64c4757e 601 if (j < 0) continue;
d013a55e
NB
602 /* note: we ignore error flags in multipath arrays
603 * as they don't make sense
604 */
4b1ac34b 605 if (info.array.level != -4)
213ee40b
NB
606 if (!(devices[j].i.disk.state & (1<<MD_DISK_SYNC))) {
607 if (!(devices[j].i.disk.state
608 & (1<<MD_DISK_FAULTY)))
aa88f531 609 sparecnt++;
d013a55e 610 continue;
aa88f531 611 }
213ee40b
NB
612 if (devices[j].i.events+event_margin >=
613 devices[most_recent].i.events) {
64c4757e 614 devices[j].uptodate = 1;
265e0f17 615 if (i < info.array.raid_disks) {
52826846 616 okcnt++;
265e0f17
NB
617 avail[i]=1;
618 } else
52826846 619 sparecnt++;
64c4757e
NB
620 }
621 }
265e0f17 622 while (force && !enough(info.array.level, info.array.raid_disks,
583315d9 623 info.array.layout, 1,
265e0f17 624 avail, okcnt)) {
64c4757e
NB
625 /* Choose the newest best drive which is
626 * not up-to-date, update the superblock
627 * and add it.
628 */
52826846 629 int fd;
3da92f27 630 struct supertype *tst;
c5a6f9a6 631 long long current_events;
cd29a5c8 632 chosen_drive = -1;
4b1ac34b 633 for (i=0; i<info.array.raid_disks && i < bestcnt; i++) {
52826846
NB
634 int j = best[i];
635 if (j>=0 &&
636 !devices[j].uptodate &&
213ee40b 637 devices[j].i.events > 0 &&
52826846 638 (chosen_drive < 0 ||
213ee40b
NB
639 devices[j].i.events
640 > devices[chosen_drive].i.events))
52826846
NB
641 chosen_drive = j;
642 }
643 if (chosen_drive < 0)
644 break;
213ee40b 645 current_events = devices[chosen_drive].i.events;
c5a6f9a6 646 add_another:
dab6685f
NB
647 if (verbose >= 0)
648 fprintf(stderr, Name ": forcing event count in %s(%d) from %d upto %d\n",
213ee40b
NB
649 devices[chosen_drive].devname,
650 devices[chosen_drive].i.disk.raid_disk,
651 (int)(devices[chosen_drive].i.events),
652 (int)(devices[most_recent].i.events));
8b0dabea 653 fd = dev_open(devices[chosen_drive].devname, O_RDWR|O_EXCL);
52826846
NB
654 if (fd < 0) {
655 fprintf(stderr, Name ": Couldn't open %s for write - not updating\n",
656 devices[chosen_drive].devname);
213ee40b 657 devices[chosen_drive].i.events = 0;
52826846
NB
658 continue;
659 }
3da92f27 660 tst = dup_super(st);
60b435db 661 if (tst->ss->load_super(tst,fd, NULL)) {
52826846
NB
662 close(fd);
663 fprintf(stderr, Name ": RAID superblock disappeared from %s - not updating.\n",
664 devices[chosen_drive].devname);
213ee40b 665 devices[chosen_drive].i.events = 0;
52826846
NB
666 continue;
667 }
213ee40b 668 info.events = devices[most_recent].i.events;
3da92f27 669 tst->ss->update_super(tst, &info, "force-one",
67a8c82d
NB
670 devices[chosen_drive].devname, verbose,
671 0, NULL);
4b1ac34b 672
3da92f27 673 if (tst->ss->store_super(tst, fd)) {
52826846
NB
674 close(fd);
675 fprintf(stderr, Name ": Could not re-write superblock on %s\n",
676 devices[chosen_drive].devname);
213ee40b 677 devices[chosen_drive].i.events = 0;
3da92f27 678 tst->ss->free_super(tst);
52826846
NB
679 continue;
680 }
681 close(fd);
213ee40b 682 devices[chosen_drive].i.events = devices[most_recent].i.events;
52826846 683 devices[chosen_drive].uptodate = 1;
265e0f17 684 avail[chosen_drive] = 1;
52826846 685 okcnt++;
3da92f27 686 tst->ss->free_super(tst);
c5a6f9a6
NB
687
688 /* If there are any other drives of the same vintage,
689 * add them in as well. We can't lose and we might gain
690 */
691 for (i=0; i<info.array.raid_disks && i < bestcnt ; i++) {
692 int j = best[i];
693 if (j >= 0 &&
694 !devices[j].uptodate &&
213ee40b
NB
695 devices[j].i.events > 0 &&
696 devices[j].i.events == current_events) {
c5a6f9a6
NB
697 chosen_drive = j;
698 goto add_another;
699 }
700 }
64c4757e 701 }
52826846
NB
702
703 /* Now we want to look at the superblock which the kernel will base things on
704 * and compare the devices that we think are working with the devices that the
705 * superblock thinks are working.
706 * If there are differences and --force is given, then update this chosen
707 * superblock.
708 */
cd29a5c8 709 chosen_drive = -1;
3da92f27 710 st->ss->free_super(st);
56eedc1a 711 for (i=0; chosen_drive < 0 && i<bestcnt; i++) {
52826846
NB
712 int j = best[i];
713 int fd;
4b1ac34b 714
52826846
NB
715 if (j<0)
716 continue;
717 if (!devices[j].uptodate)
718 continue;
719 chosen_drive = j;
8b0dabea 720 if ((fd=dev_open(devices[j].devname, O_RDONLY|O_EXCL))< 0) {
52826846
NB
721 fprintf(stderr, Name ": Cannot open %s: %s\n",
722 devices[j].devname, strerror(errno));
d55e3aef 723 if (must_close) close(mdfd);
52826846
NB
724 return 1;
725 }
3da92f27 726 if (st->ss->load_super(st,fd, NULL)) {
52826846
NB
727 close(fd);
728 fprintf(stderr, Name ": RAID superblock has disappeared from %s\n",
729 devices[j].devname);
d55e3aef 730 if (must_close) close(mdfd);
52826846
NB
731 return 1;
732 }
733 close(fd);
734 }
3da92f27 735 if (st->sb == NULL) {
4b1ac34b 736 fprintf(stderr, Name ": No suitable drives found for %s\n", mddev);
d55e3aef 737 if (must_close) close(mdfd);
4b1ac34b
NB
738 return 1;
739 }
3da92f27 740 st->ss->getinfo_super(st, &info);
f35f2525
N
741#ifndef MDASSEMBLE
742 sysfs_init(&info, mdfd, 0);
743#endif
56eedc1a 744 for (i=0; i<bestcnt; i++) {
52826846 745 int j = best[i];
98c6faba 746 unsigned int desired_state;
11a3e71d 747
4b1ac34b 748 if (i < info.array.raid_disks)
11a3e71d
NB
749 desired_state = (1<<MD_DISK_ACTIVE) | (1<<MD_DISK_SYNC);
750 else
751 desired_state = 0;
752
52826846
NB
753 if (j<0)
754 continue;
755 if (!devices[j].uptodate)
756 continue;
4b1ac34b 757
213ee40b
NB
758 devices[j].i.disk.state = desired_state;
759
760 if (st->ss->update_super(st, &devices[j].i, "assemble", NULL,
68c7d6d7 761 verbose, 0, NULL)) {
52826846 762 if (force) {
dab6685f
NB
763 if (verbose >= 0)
764 fprintf(stderr, Name ": "
765 "clearing FAULTY flag for device %d in %s for %s\n",
766 j, mddev, devices[j].devname);
4b1ac34b 767 change = 1;
52826846 768 } else {
dab6685f
NB
769 if (verbose >= -1)
770 fprintf(stderr, Name ": "
771 "device %d in %s has wrong state in superblock, but %s seems ok\n",
772 i, mddev, devices[j].devname);
52826846
NB
773 }
774 }
4b1ac34b 775#if 0
213ee40b 776 if (!(super.disks[i].i.disk.state & (1 << MD_DISK_FAULTY))) {
52826846
NB
777 fprintf(stderr, Name ": devices %d of %s is not marked FAULTY in superblock, but cannot be found\n",
778 i, mddev);
779 }
4b1ac34b 780#endif
52826846 781 }
c5a6f9a6
NB
782 if (force && !clean &&
783 !enough(info.array.level, info.array.raid_disks,
784 info.array.layout, clean,
785 avail, okcnt)) {
3da92f27 786 change += st->ss->update_super(st, &info, "force-array",
67a8c82d
NB
787 devices[chosen_drive].devname, verbose,
788 0, NULL);
583315d9 789 clean = 1;
d013a55e 790 }
52826846 791
4b1ac34b 792 if (change) {
52826846 793 int fd;
8b0dabea 794 fd = dev_open(devices[chosen_drive].devname, O_RDWR|O_EXCL);
52826846 795 if (fd < 0) {
353632d9 796 fprintf(stderr, Name ": Could not open %s for write - cannot Assemble array.\n",
52826846 797 devices[chosen_drive].devname);
d55e3aef 798 if (must_close) close(mdfd);
52826846
NB
799 return 1;
800 }
3da92f27 801 if (st->ss->store_super(st, fd)) {
52826846
NB
802 close(fd);
803 fprintf(stderr, Name ": Could not re-write superblock on %s\n",
804 devices[chosen_drive].devname);
d55e3aef 805 if (must_close) close(mdfd);
52826846
NB
806 return 1;
807 }
808 close(fd);
52826846
NB
809 }
810
353632d9
NB
811 /* If we are in the middle of a reshape we may need to restore saved data
812 * that was moved aside due to the reshape overwriting live data
813 * The code of doing this lives in Grow.c
814 */
39c5a909 815#ifndef MDASSEMBLE
353632d9
NB
816 if (info.reshape_active) {
817 int err = 0;
818 int *fdlist = malloc(sizeof(int)* bestcnt);
819 for (i=0; i<bestcnt; i++) {
820 int j = best[i];
821 if (j >= 0) {
822 fdlist[i] = dev_open(devices[j].devname, O_RDWR|O_EXCL);
823 if (fdlist[i] < 0) {
824 fprintf(stderr, Name ": Could not open %s for write - cannot Assemble array.\n",
825 devices[j].devname);
826 err = 1;
827 break;
828 }
829 } else
830 fdlist[i] = -1;
831 }
832 if (!err)
06b0d786 833 err = Grow_restart(st, &info, fdlist, bestcnt, backup_file);
353632d9
NB
834 while (i>0) {
835 i--;
836 if (fdlist[i]>=0) close(fdlist[i]);
837 }
838 if (err) {
839 fprintf(stderr, Name ": Failed to restore critical section for reshape, sorry.\n");
d55e3aef 840 if (must_close) close(mdfd);
353632d9
NB
841 return err;
842 }
843 }
39c5a909 844#endif
aa88f531
NB
845 /* count number of in-sync devices according to the superblock.
846 * We must have this number to start the array without -s or -R
847 */
4b1ac34b 848 req_cnt = info.array.working_disks;
aa88f531 849
64c4757e
NB
850 /* Almost ready to actually *do* something */
851 if (!old_linux) {
fbf8a0b7 852 int rv;
a19c88b8 853
f35f2525 854 rv = set_array_info(mdfd, st, &info);
fbf8a0b7 855 if (rv) {
f35f2525 856 fprintf(stderr, Name ": failed to set array info for %s: %s\n",
64c4757e 857 mddev, strerror(errno));
d55e3aef 858 if (must_close) close(mdfd);
64c4757e
NB
859 return 1;
860 }
11484a63 861 if (ident->bitmap_fd >= 0) {
c82f047c
NB
862 if (ioctl(mdfd, SET_BITMAP_FILE, ident->bitmap_fd) != 0) {
863 fprintf(stderr, Name ": SET_BITMAP_FILE failed.\n");
d55e3aef 864 if (must_close) close(mdfd);
c82f047c
NB
865 return 1;
866 }
7ef02d01
NB
867 } else if (ident->bitmap_file) {
868 /* From config file */
869 int bmfd = open(ident->bitmap_file, O_RDWR);
870 if (bmfd < 0) {
871 fprintf(stderr, Name ": Could not open bitmap file %s\n",
872 ident->bitmap_file);
d55e3aef 873 if (must_close) close(mdfd);
7ef02d01
NB
874 return 1;
875 }
876 if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
877 fprintf(stderr, Name ": Failed to set bitmapfile for %s\n", mddev);
878 close(bmfd);
d55e3aef 879 if (must_close) close(mdfd);
7ef02d01
NB
880 return 1;
881 }
882 close(bmfd);
c82f047c 883 }
7ef02d01 884
52826846 885 /* First, add the raid disks, but add the chosen one last */
56eedc1a 886 for (i=0; i<= bestcnt; i++) {
52826846 887 int j;
56eedc1a 888 if (i < bestcnt) {
52826846
NB
889 j = best[i];
890 if (j == chosen_drive)
891 continue;
892 } else
893 j = chosen_drive;
894
56eedc1a 895 if (j >= 0 /* && devices[j].uptodate */) {
f35f2525 896 rv = add_disk(mdfd, st, &info, &devices[j].i);
7801ac20 897
a19c88b8 898 if (rv) {
213ee40b
NB
899 fprintf(stderr, Name ": failed to add "
900 "%s to %s: %s\n",
64c4757e
NB
901 devices[j].devname,
902 mddev,
903 strerror(errno));
213ee40b
NB
904 if (i < info.array.raid_disks
905 || i == bestcnt)
52826846
NB
906 okcnt--;
907 else
908 sparecnt--;
dab6685f 909 } else if (verbose > 0)
213ee40b
NB
910 fprintf(stderr, Name ": added %s "
911 "to %s as %d\n",
912 devices[j].devname, mddev,
913 devices[j].i.disk.raid_disk);
dab6685f 914 } else if (verbose > 0 && i < info.array.raid_disks)
213ee40b
NB
915 fprintf(stderr, Name ": no uptodate device for "
916 "slot %d of %s\n",
64c4757e
NB
917 i, mddev);
918 }
aba69144 919
598f0d58
NB
920 if (info.array.level == LEVEL_CONTAINER) {
921 if (verbose >= 0) {
922 fprintf(stderr, Name ": Container %s has been "
923 "assembled with %d drive%s",
924 mddev, okcnt, okcnt==1?"":"s");
925 if (okcnt < info.array.raid_disks)
926 fprintf(stderr, " (out of %d)",
927 info.array.raid_disks);
928 fprintf(stderr, "\n");
929 }
930 if (must_close)
931 close(mdfd);
932 return 0;
933 }
934
64c4757e 935 if (runstop == 1 ||
b8a8ccf9 936 (runstop <= 0 &&
583315d9
NB
937 ( enough(info.array.level, info.array.raid_disks,
938 info.array.layout, clean, avail, okcnt) &&
aa88f531
NB
939 (okcnt >= req_cnt || start_partial_ok)
940 ))) {
82b27616 941 if (ioctl(mdfd, RUN_ARRAY, NULL)==0) {
dab6685f
NB
942 if (verbose >= 0) {
943 fprintf(stderr, Name ": %s has been started with %d drive%s",
944 mddev, okcnt, okcnt==1?"":"s");
b8a8ccf9 945 if (okcnt < info.array.raid_disks)
dab6685f
NB
946 fprintf(stderr, " (out of %d)", info.array.raid_disks);
947 if (sparecnt)
948 fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
949 fprintf(stderr, ".\n");
950 }
589395d6
NB
951 if (must_close) {
952 int usecs = 1;
953 close(mdfd);
954 /* There is a nasty race with 'mdadm --monitor'.
955 * If it opens this device before we close it,
956 * it gets an incomplete open on which IO
598f0d58
NB
957 * doesn't work and the capacity is
958 * wrong.
589395d6
NB
959 * If we reopen (to check for layered devices)
960 * before --monitor closes, we loose.
961 *
962 * So: wait upto 1 second for there to be
963 * a non-zero capacity.
964 */
965 while (usecs < 1000) {
966 mdfd = open(mddev, O_RDONLY);
967 if (mdfd >= 0) {
beae1dfe
NB
968 unsigned long long size;
969 if (get_dev_size(mdfd, NULL, &size) &&
589395d6
NB
970 size > 0)
971 break;
972 close(mdfd);
973 }
974 usleep(usecs);
975 usecs <<= 1;
976 }
977 }
64c4757e 978 return 0;
82b27616 979 }
682c7051 980 fprintf(stderr, Name ": failed to RUN_ARRAY %s: %s\n",
64c4757e 981 mddev, strerror(errno));
583315d9
NB
982
983 if (!enough(info.array.level, info.array.raid_disks,
984 info.array.layout, 1, avail, okcnt))
985 fprintf(stderr, Name ": Not enough devices to "
986 "start the array.\n");
987 else if (!enough(info.array.level,
988 info.array.raid_disks,
989 info.array.layout, clean,
990 avail, okcnt))
991 fprintf(stderr, Name ": Not enough devices to "
992 "start the array while not clean "
993 "- consider --force.\n");
994
1c203a4b
NB
995 if (must_close) {
996 ioctl(mdfd, STOP_ARRAY, NULL);
997 close(mdfd);
998 }
64c4757e
NB
999 return 1;
1000 }
82b27616 1001 if (runstop == -1) {
b8a8ccf9 1002 fprintf(stderr, Name ": %s assembled from %d drive%s",
52826846 1003 mddev, okcnt, okcnt==1?"":"s");
b8a8ccf9
NB
1004 if (okcnt != info.array.raid_disks)
1005 fprintf(stderr, " (out of %d)", info.array.raid_disks);
1006 fprintf(stderr, ", but not started.\n");
d55e3aef 1007 if (must_close) close(mdfd);
64c4757e 1008 return 0;
82b27616 1009 }
4855f95c 1010 if (verbose >= -1) {
dab6685f
NB
1011 fprintf(stderr, Name ": %s assembled from %d drive%s", mddev, okcnt, okcnt==1?"":"s");
1012 if (sparecnt)
1013 fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
583315d9
NB
1014 if (!enough(info.array.level, info.array.raid_disks,
1015 info.array.layout, 1, avail, okcnt))
dab6685f 1016 fprintf(stderr, " - not enough to start the array.\n");
583315d9
NB
1017 else if (!enough(info.array.level,
1018 info.array.raid_disks,
1019 info.array.layout, clean,
1020 avail, okcnt))
1021 fprintf(stderr, " - not enough to start the "
1022 "array while not clean - consider "
1023 "--force.\n");
dab6685f
NB
1024 else {
1025 if (req_cnt == info.array.raid_disks)
1026 fprintf(stderr, " - need all %d to start it", req_cnt);
1027 else
1028 fprintf(stderr, " - need %d of %d to start", req_cnt, info.array.raid_disks);
1029 fprintf(stderr, " (use --run to insist).\n");
1030 }
aa88f531 1031 }
1c203a4b
NB
1032 if (must_close) {
1033 ioctl(mdfd, STOP_ARRAY, NULL);
1034 close(mdfd);
1035 }
64c4757e 1036 return 1;
82b27616 1037 } else {
52826846
NB
1038 /* The "chosen_drive" is a good choice, and if necessary, the superblock has
1039 * been updated to point to the current locations of devices.
1040 * so we can just start the array
82b27616 1041 */
cd29a5c8 1042 unsigned long dev;
213ee40b
NB
1043 dev = makedev(devices[chosen_drive].i.disk.major,
1044 devices[chosen_drive].i.disk.minor);
82b27616
NB
1045 if (ioctl(mdfd, START_ARRAY, dev)) {
1046 fprintf(stderr, Name ": Cannot start array: %s\n",
1047 strerror(errno));
1048 }
aba69144 1049
64c4757e 1050 }
d55e3aef 1051 if (must_close) close(mdfd);
e0d19036 1052 return 0;
64c4757e 1053}