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Improve error message when mdadm fails to stop an array.
[thirdparty/mdadm.git] / Manage.c
1 /*
2 * mdadm - manage Linux "md" devices aka RAID arrays.
3 *
4 * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
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
30 #include "mdadm.h"
31 #include "md_u.h"
32 #include "md_p.h"
33
34 #define REGISTER_DEV _IO (MD_MAJOR, 1)
35 #define START_MD _IO (MD_MAJOR, 2)
36 #define STOP_MD _IO (MD_MAJOR, 3)
37
38 int Manage_ro(char *devname, int fd, int readonly)
39 {
40 /* switch to readonly or rw
41 *
42 * requires >= 0.90.0
43 * first check that array is runing
44 * use RESTART_ARRAY_RW or STOP_ARRAY_RO
45 *
46 */
47 mdu_array_info_t array;
48
49 if (md_get_version(fd) < 9000) {
50 fprintf(stderr, Name ": need md driver version 0.90.0 or later\n");
51 return 1;
52 }
53 if (ioctl(fd, GET_ARRAY_INFO, &array)) {
54 fprintf(stderr, Name ": %s does not appear to be active.\n",
55 devname);
56 return 1;
57 }
58
59 if (readonly>0) {
60 if (ioctl(fd, STOP_ARRAY_RO, NULL)) {
61 fprintf(stderr, Name ": failed to set readonly for %s: %s\n",
62 devname, strerror(errno));
63 return 1;
64 }
65 } else if (readonly < 0) {
66 if (ioctl(fd, RESTART_ARRAY_RW, NULL)) {
67 fprintf(stderr, Name ": failed to set writable for %s: %s\n",
68 devname, strerror(errno));
69 return 1;
70 }
71 }
72 return 0;
73 }
74
75 #ifndef MDASSEMBLE
76
77 int Manage_runstop(char *devname, int fd, int runstop, int quiet)
78 {
79 /* Run or stop the array. array must already be configured
80 * required >= 0.90.0
81 */
82 mdu_param_t param; /* unused */
83
84 if (runstop == -1 && md_get_version(fd) < 9000) {
85 if (ioctl(fd, STOP_MD, 0)) {
86 if (!quiet) fprintf(stderr, Name ": stopping device %s failed: %s\n",
87 devname, strerror(errno));
88 return 1;
89 }
90 }
91
92 if (md_get_version(fd) < 9000) {
93 fprintf(stderr, Name ": need md driver version 0.90.0 or later\n");
94 return 1;
95 }
96 /*
97 if (ioctl(fd, GET_ARRAY_INFO, &array)) {
98 fprintf(stderr, Name ": %s does not appear to be active.\n",
99 devname);
100 return 1;
101 }
102 */
103 if (runstop>0) {
104 if (ioctl(fd, RUN_ARRAY, &param)) {
105 fprintf(stderr, Name ": failed to run array %s: %s\n",
106 devname, strerror(errno));
107 return 1;
108 }
109 if (quiet <= 0)
110 fprintf(stderr, Name ": started %s\n", devname);
111 } else if (runstop < 0){
112 struct map_ent *map = NULL;
113 struct stat stb;
114 if (ioctl(fd, STOP_ARRAY, NULL)) {
115 if (quiet==0) {
116 fprintf(stderr, Name ": fail to stop array %s: %s\n",
117 devname, strerror(errno));
118 if (errno == EBUSY)
119 fprintf(stderr, "Perhaps a running "
120 "process, mounted filesystem "
121 "or active volume group?\n");
122 }
123 return 1;
124 }
125 if (quiet <= 0)
126 fprintf(stderr, Name ": stopped %s\n", devname);
127 if (fstat(fd, &stb) == 0) {
128 int devnum;
129 if (major(stb.st_rdev) == MD_MAJOR)
130 devnum = minor(stb.st_rdev);
131 else
132 devnum = -1-(minor(stb.st_rdev)>>6);
133 map_delete(&map, devnum);
134 map_write(map);
135 map_free(map);
136 }
137 }
138 return 0;
139 }
140
141 int Manage_resize(char *devname, int fd, long long size, int raid_disks)
142 {
143 mdu_array_info_t info;
144 if (ioctl(fd, GET_ARRAY_INFO, &info) != 0) {
145 fprintf(stderr, Name ": Cannot get array information for %s: %s\n",
146 devname, strerror(errno));
147 return 1;
148 }
149 if (size >= 0)
150 info.size = size;
151 if (raid_disks > 0)
152 info.raid_disks = raid_disks;
153 if (ioctl(fd, SET_ARRAY_INFO, &info) != 0) {
154 fprintf(stderr, Name ": Cannot set device size/shape for %s: %s\n",
155 devname, strerror(errno));
156 return 1;
157 }
158 return 0;
159 }
160
161 int Manage_reconfig(char *devname, int fd, int layout)
162 {
163 mdu_array_info_t info;
164 if (ioctl(fd, GET_ARRAY_INFO, &info) != 0) {
165 fprintf(stderr, Name ": Cannot get array information for %s: %s\n",
166 devname, strerror(errno));
167 return 1;
168 }
169 info.layout = layout;
170 printf("layout set to %d\n", info.layout);
171 if (ioctl(fd, SET_ARRAY_INFO, &info) != 0) {
172 fprintf(stderr, Name ": Cannot set layout for %s: %s\n",
173 devname, strerror(errno));
174 return 1;
175 }
176 return 0;
177 }
178
179 int Manage_subdevs(char *devname, int fd,
180 mddev_dev_t devlist, int verbose)
181 {
182 /* do something to each dev.
183 * devmode can be
184 * 'a' - add the device
185 * try HOT_ADD_DISK
186 * If that fails EINVAL, try ADD_NEW_DISK
187 * 'r' - remove the device HOT_REMOVE_DISK
188 * device can be 'faulty' or 'detached' in which case all
189 * matching devices are removed.
190 * 'f' - set the device faulty SET_DISK_FAULTY
191 * device can be 'detached' in which case any device that
192 * is inaccessible will be marked faulty.
193 */
194 mdu_array_info_t array;
195 mdu_disk_info_t disc;
196 unsigned long long array_size;
197 mddev_dev_t dv, next = NULL;
198 struct stat stb;
199 int j, jnext = 0;
200 int tfd;
201 struct supertype *st, *tst;
202 int duuid[4];
203 int ouuid[4];
204
205 if (ioctl(fd, GET_ARRAY_INFO, &array)) {
206 fprintf(stderr, Name ": cannot get array info for %s\n",
207 devname);
208 return 1;
209 }
210
211 /* array.size is only 32 bit and may be truncated.
212 * So read from sysfs if possible, and record number of sectors
213 */
214
215 array_size = get_component_size(fd);
216 if (array_size <= 0)
217 array_size = array.size * 2;
218
219 tst = super_by_fd(fd);
220 if (!tst) {
221 fprintf(stderr, Name ": unsupport array - version %d.%d\n",
222 array.major_version, array.minor_version);
223 return 1;
224 }
225
226 for (dv = devlist, j=0 ; dv; dv = next, j = jnext) {
227 unsigned long long ldsize;
228 char dvname[20];
229 char *dnprintable = dv->devname;
230
231 next = dv->next;
232 jnext = 0;
233
234 if (strcmp(dv->devname, "failed")==0 ||
235 strcmp(dv->devname, "faulty")==0) {
236 if (dv->disposition != 'r') {
237 fprintf(stderr, Name ": %s only meaningful "
238 "with -r, not -%c\n",
239 dv->devname, dv->disposition);
240 return 1;
241 }
242 for (; j < array.raid_disks + array.nr_disks ; j++) {
243 disc.number = j;
244 if (ioctl(fd, GET_DISK_INFO, &disc))
245 continue;
246 if (disc.major == 0 && disc.minor == 0)
247 continue;
248 if ((disc.state & 1) == 0) /* faulty */
249 continue;
250 stb.st_rdev = makedev(disc.major, disc.minor);
251 next = dv;
252 jnext = j+1;
253 sprintf(dvname,"%d:%d", disc.major, disc.minor);
254 dnprintable = dvname;
255 break;
256 }
257 if (jnext == 0)
258 continue;
259 } else if (strcmp(dv->devname, "detached") == 0) {
260 if (dv->disposition != 'r' && dv->disposition != 'f') {
261 fprintf(stderr, Name ": %s only meaningful "
262 "with -r of -f, not -%c\n",
263 dv->devname, dv->disposition);
264 return 1;
265 }
266 for (; j < array.raid_disks + array.nr_disks; j++) {
267 int sfd;
268 disc.number = j;
269 if (ioctl(fd, GET_DISK_INFO, &disc))
270 continue;
271 if (disc.major == 0 && disc.minor == 0)
272 continue;
273 sprintf(dvname,"%d:%d", disc.major, disc.minor);
274 sfd = dev_open(dvname, O_RDONLY);
275 if (sfd >= 0) {
276 close(sfd);
277 continue;
278 }
279 if (dv->disposition == 'f' &&
280 (disc.state & 1) == 1) /* already faulty */
281 continue;
282 if (errno != ENXIO)
283 continue;
284 stb.st_rdev = makedev(disc.major, disc.minor);
285 next = dv;
286 jnext = j+1;
287 dnprintable = dvname;
288 break;
289 }
290 if (jnext == 0)
291 continue;
292 } else {
293 j = 0;
294
295 if (stat(dv->devname, &stb)) {
296 fprintf(stderr, Name ": cannot find %s: %s\n",
297 dv->devname, strerror(errno));
298 return 1;
299 }
300 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
301 fprintf(stderr, Name ": %s is not a "
302 "block device.\n",
303 dv->devname);
304 return 1;
305 }
306 }
307 switch(dv->disposition){
308 default:
309 fprintf(stderr, Name ": internal error - devmode[%s]=%d\n",
310 dv->devname, dv->disposition);
311 return 1;
312 case 'a':
313 /* add the device */
314
315 /* Make sure it isn't in use (in 2.6 or later) */
316 tfd = open(dv->devname, O_RDONLY|O_EXCL);
317 if (tfd < 0) {
318 fprintf(stderr, Name ": Cannot open %s: %s\n",
319 dv->devname, strerror(errno));
320 return 1;
321 }
322 remove_partitions(tfd);
323
324 st = dup_super(tst);
325
326 if (array.not_persistent==0)
327 st->ss->load_super(st, tfd, NULL);
328
329 if (!get_dev_size(tfd, dv->devname, &ldsize)) {
330 close(tfd);
331 return 1;
332 }
333 close(tfd);
334
335 if (array.major_version == 0 &&
336 md_get_version(fd)%100 < 2) {
337 if (ioctl(fd, HOT_ADD_DISK,
338 (unsigned long)stb.st_rdev)==0) {
339 if (verbose >= 0)
340 fprintf(stderr, Name ": hot added %s\n",
341 dv->devname);
342 continue;
343 }
344
345 fprintf(stderr, Name ": hot add failed for %s: %s\n",
346 dv->devname, strerror(errno));
347 return 1;
348 }
349
350 if (array.not_persistent == 0) {
351
352 /* Make sure device is large enough */
353 if (tst->ss->avail_size(tst, ldsize/512) <
354 array_size) {
355 fprintf(stderr, Name ": %s not large enough to join array\n",
356 dv->devname);
357 return 1;
358 }
359
360 /* need to find a sample superblock to copy, and
361 * a spare slot to use
362 */
363 for (j = 0; j < tst->max_devs; j++) {
364 char *dev;
365 int dfd;
366 disc.number = j;
367 if (ioctl(fd, GET_DISK_INFO, &disc))
368 continue;
369 if (disc.major==0 && disc.minor==0)
370 continue;
371 if ((disc.state & 4)==0) continue; /* sync */
372 /* Looks like a good device to try */
373 dev = map_dev(disc.major, disc.minor, 1);
374 if (!dev) continue;
375 dfd = dev_open(dev, O_RDONLY);
376 if (dfd < 0) continue;
377 if (tst->ss->load_super(tst, dfd,
378 NULL)) {
379 close(dfd);
380 continue;
381 }
382 close(dfd);
383 break;
384 }
385 if (!tst->sb) {
386 fprintf(stderr, Name ": cannot find valid superblock in this array - HELP\n");
387 return 1;
388 }
389 /* Possibly this device was recently part of the array
390 * and was temporarily removed, and is now being re-added.
391 * If so, we can simply re-add it.
392 */
393 tst->ss->uuid_from_super(tst, duuid);
394
395 /* re-add doesn't work for version-1 superblocks
396 * before 2.6.18 :-(
397 */
398 if (array.major_version == 1 &&
399 get_linux_version() <= 2006018)
400 ;
401 else if (st->sb) {
402 st->ss->uuid_from_super(st, ouuid);
403 if (memcmp(duuid, ouuid, sizeof(ouuid))==0) {
404 /* looks close enough for now. Kernel
405 * will worry about whether a bitmap
406 * based reconstruction is possible.
407 */
408 struct mdinfo mdi;
409 st->ss->getinfo_super(st, &mdi);
410 disc.major = major(stb.st_rdev);
411 disc.minor = minor(stb.st_rdev);
412 disc.number = mdi.disk.number;
413 disc.raid_disk = mdi.disk.raid_disk;
414 disc.state = mdi.disk.state;
415 if (dv->writemostly)
416 disc.state |= 1 << MD_DISK_WRITEMOSTLY;
417 if (ioctl(fd, ADD_NEW_DISK, &disc) == 0) {
418 if (verbose >= 0)
419 fprintf(stderr, Name ": re-added %s\n", dv->devname);
420 continue;
421 }
422 /* fall back on normal-add */
423 }
424 }
425 } else {
426 /* non-persistent. Must ensure that new drive
427 * is at least array.size big.
428 */
429 if (ldsize/512 < array_size) {
430 fprintf(stderr, Name ": %s not large enough to join array\n",
431 dv->devname);
432 return 1;
433 }
434 }
435 /* in 2.6.17 and earlier, version-1 superblocks won't
436 * use the number we write, but will choose a free number.
437 * we must choose the same free number, which requires
438 * starting at 'raid_disks' and counting up
439 */
440 for (j = array.raid_disks; j< tst->max_devs; j++) {
441 disc.number = j;
442 if (ioctl(fd, GET_DISK_INFO, &disc))
443 break;
444 if (disc.major==0 && disc.minor==0)
445 break;
446 if (disc.state & 8) /* removed */
447 break;
448 }
449 disc.major = major(stb.st_rdev);
450 disc.minor = minor(stb.st_rdev);
451 disc.number =j;
452 disc.state = 0;
453 if (array.not_persistent==0) {
454 if (dv->writemostly)
455 disc.state |= 1 << MD_DISK_WRITEMOSTLY;
456 tst->ss->add_to_super(tst, &disc);
457 if (tst->ss->write_init_super(tst, &disc,
458 dv->devname))
459 return 1;
460 } else if (dv->re_add) {
461 /* this had better be raid1.
462 * As we are "--re-add"ing we must find a spare slot
463 * to fill.
464 */
465 char *used = malloc(array.raid_disks);
466 memset(used, 0, array.raid_disks);
467 for (j=0; j< tst->max_devs; j++) {
468 mdu_disk_info_t disc2;
469 disc2.number = j;
470 if (ioctl(fd, GET_DISK_INFO, &disc2))
471 continue;
472 if (disc2.major==0 && disc2.minor==0)
473 continue;
474 if (disc2.state & 8) /* removed */
475 continue;
476 if (disc2.raid_disk < 0)
477 continue;
478 if (disc2.raid_disk > array.raid_disks)
479 continue;
480 used[disc2.raid_disk] = 1;
481 }
482 for (j=0 ; j<array.raid_disks; j++)
483 if (!used[j]) {
484 disc.raid_disk = j;
485 disc.state |= (1<<MD_DISK_SYNC);
486 break;
487 }
488 }
489 if (dv->writemostly)
490 disc.state |= (1 << MD_DISK_WRITEMOSTLY);
491 if (ioctl(fd,ADD_NEW_DISK, &disc)) {
492 fprintf(stderr, Name ": add new device failed for %s as %d: %s\n",
493 dv->devname, j, strerror(errno));
494 return 1;
495 }
496 if (verbose >= 0)
497 fprintf(stderr, Name ": added %s\n", dv->devname);
498 break;
499
500 case 'r':
501 /* hot remove */
502 /* FIXME check that it is a current member */
503 if (ioctl(fd, HOT_REMOVE_DISK, (unsigned long)stb.st_rdev)) {
504 fprintf(stderr, Name ": hot remove failed "
505 "for %s: %s\n", dnprintable,
506 strerror(errno));
507 return 1;
508 }
509 if (verbose >= 0)
510 fprintf(stderr, Name ": hot removed %s\n",
511 dnprintable);
512 break;
513
514 case 'f': /* set faulty */
515 /* FIXME check current member */
516 if (ioctl(fd, SET_DISK_FAULTY, (unsigned long) stb.st_rdev)) {
517 fprintf(stderr, Name ": set device faulty failed for %s: %s\n",
518 dnprintable, strerror(errno));
519 return 1;
520 }
521 if (verbose >= 0)
522 fprintf(stderr, Name ": set %s faulty in %s\n",
523 dnprintable, devname);
524 break;
525 }
526 }
527 return 0;
528
529 }
530
531 int autodetect(void)
532 {
533 /* Open any md device, and issue the RAID_AUTORUN ioctl */
534 int rv = 1;
535 int fd = dev_open("9:0", O_RDONLY);
536 if (fd >= 0) {
537 if (ioctl(fd, RAID_AUTORUN, 0) == 0)
538 rv = 0;
539 close(fd);
540 }
541 return rv;
542 }
543 #endif
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