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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, ¶m)) { | |
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 | /* need to find a sample superblock to copy, and | |
353 | * a spare slot to use | |
354 | */ | |
355 | for (j = 0; j < tst->max_devs; j++) { | |
356 | char *dev; | |
357 | int dfd; | |
358 | disc.number = j; | |
359 | if (ioctl(fd, GET_DISK_INFO, &disc)) | |
360 | continue; | |
361 | if (disc.major==0 && disc.minor==0) | |
362 | continue; | |
363 | if ((disc.state & 4)==0) continue; /* sync */ | |
364 | /* Looks like a good device to try */ | |
365 | dev = map_dev(disc.major, disc.minor, 1); | |
366 | if (!dev) continue; | |
367 | dfd = dev_open(dev, O_RDONLY); | |
368 | if (dfd < 0) continue; | |
369 | if (tst->ss->load_super(tst, dfd, | |
370 | NULL)) { | |
371 | close(dfd); | |
372 | continue; | |
373 | } | |
374 | close(dfd); | |
375 | break; | |
376 | } | |
377 | if (!tst->sb) { | |
378 | fprintf(stderr, Name ": cannot find valid superblock in this array - HELP\n"); | |
379 | return 1; | |
380 | } | |
381 | ||
382 | /* Make sure device is large enough */ | |
383 | if (tst->ss->avail_size(tst, ldsize/512) < | |
384 | array_size) { | |
385 | fprintf(stderr, Name ": %s not large enough to join array\n", | |
386 | dv->devname); | |
387 | return 1; | |
388 | } | |
389 | ||
390 | /* Possibly this device was recently part of the array | |
391 | * and was temporarily removed, and is now being re-added. | |
392 | * If so, we can simply re-add it. | |
393 | */ | |
394 | tst->ss->uuid_from_super(tst, duuid); | |
395 | ||
396 | /* re-add doesn't work for version-1 superblocks | |
397 | * before 2.6.18 :-( | |
398 | */ | |
399 | if (array.major_version == 1 && | |
400 | get_linux_version() <= 2006018) | |
401 | ; | |
402 | else if (st->sb) { | |
403 | st->ss->uuid_from_super(st, ouuid); | |
404 | if (memcmp(duuid, ouuid, sizeof(ouuid))==0) { | |
405 | /* looks close enough for now. Kernel | |
406 | * will worry about whether a bitmap | |
407 | * based reconstruction is possible. | |
408 | */ | |
409 | struct mdinfo mdi; | |
410 | st->ss->getinfo_super(st, &mdi); | |
411 | disc.major = major(stb.st_rdev); | |
412 | disc.minor = minor(stb.st_rdev); | |
413 | disc.number = mdi.disk.number; | |
414 | disc.raid_disk = mdi.disk.raid_disk; | |
415 | disc.state = mdi.disk.state; | |
416 | if (dv->writemostly == 1) | |
417 | disc.state |= 1 << MD_DISK_WRITEMOSTLY; | |
418 | if (dv->writemostly == 2) | |
419 | disc.state &= ~(1 << MD_DISK_WRITEMOSTLY); | |
420 | if (ioctl(fd, ADD_NEW_DISK, &disc) == 0) { | |
421 | if (verbose >= 0) | |
422 | fprintf(stderr, Name ": re-added %s\n", dv->devname); | |
423 | continue; | |
424 | } | |
425 | /* fall back on normal-add */ | |
426 | } | |
427 | } | |
428 | } else { | |
429 | /* non-persistent. Must ensure that new drive | |
430 | * is at least array.size big. | |
431 | */ | |
432 | if (ldsize/512 < array_size) { | |
433 | fprintf(stderr, Name ": %s not large enough to join array\n", | |
434 | dv->devname); | |
435 | return 1; | |
436 | } | |
437 | } | |
438 | /* in 2.6.17 and earlier, version-1 superblocks won't | |
439 | * use the number we write, but will choose a free number. | |
440 | * we must choose the same free number, which requires | |
441 | * starting at 'raid_disks' and counting up | |
442 | */ | |
443 | for (j = array.raid_disks; j< tst->max_devs; j++) { | |
444 | disc.number = j; | |
445 | if (ioctl(fd, GET_DISK_INFO, &disc)) | |
446 | break; | |
447 | if (disc.major==0 && disc.minor==0) | |
448 | break; | |
449 | if (disc.state & 8) /* removed */ | |
450 | break; | |
451 | } | |
452 | disc.major = major(stb.st_rdev); | |
453 | disc.minor = minor(stb.st_rdev); | |
454 | disc.number =j; | |
455 | disc.state = 0; | |
456 | if (array.not_persistent==0) { | |
457 | if (dv->writemostly == 1) | |
458 | disc.state |= 1 << MD_DISK_WRITEMOSTLY; | |
459 | tst->ss->add_to_super(tst, &disc); | |
460 | if (tst->ss->write_init_super(tst, &disc, | |
461 | dv->devname)) | |
462 | return 1; | |
463 | } else if (dv->re_add) { | |
464 | /* this had better be raid1. | |
465 | * As we are "--re-add"ing we must find a spare slot | |
466 | * to fill. | |
467 | */ | |
468 | char *used = malloc(array.raid_disks); | |
469 | memset(used, 0, array.raid_disks); | |
470 | for (j=0; j< tst->max_devs; j++) { | |
471 | mdu_disk_info_t disc2; | |
472 | disc2.number = j; | |
473 | if (ioctl(fd, GET_DISK_INFO, &disc2)) | |
474 | continue; | |
475 | if (disc2.major==0 && disc2.minor==0) | |
476 | continue; | |
477 | if (disc2.state & 8) /* removed */ | |
478 | continue; | |
479 | if (disc2.raid_disk < 0) | |
480 | continue; | |
481 | if (disc2.raid_disk > array.raid_disks) | |
482 | continue; | |
483 | used[disc2.raid_disk] = 1; | |
484 | } | |
485 | for (j=0 ; j<array.raid_disks; j++) | |
486 | if (!used[j]) { | |
487 | disc.raid_disk = j; | |
488 | disc.state |= (1<<MD_DISK_SYNC); | |
489 | break; | |
490 | } | |
491 | } | |
492 | if (dv->writemostly == 1) | |
493 | disc.state |= (1 << MD_DISK_WRITEMOSTLY); | |
494 | if (ioctl(fd,ADD_NEW_DISK, &disc)) { | |
495 | fprintf(stderr, Name ": add new device failed for %s as %d: %s\n", | |
496 | dv->devname, j, strerror(errno)); | |
497 | return 1; | |
498 | } | |
499 | if (verbose >= 0) | |
500 | fprintf(stderr, Name ": added %s\n", dv->devname); | |
501 | break; | |
502 | ||
503 | case 'r': | |
504 | /* hot remove */ | |
505 | /* FIXME check that it is a current member */ | |
506 | if (ioctl(fd, HOT_REMOVE_DISK, (unsigned long)stb.st_rdev)) { | |
507 | fprintf(stderr, Name ": hot remove failed " | |
508 | "for %s: %s\n", dnprintable, | |
509 | strerror(errno)); | |
510 | return 1; | |
511 | } | |
512 | if (verbose >= 0) | |
513 | fprintf(stderr, Name ": hot removed %s\n", | |
514 | dnprintable); | |
515 | break; | |
516 | ||
517 | case 'f': /* set faulty */ | |
518 | /* FIXME check current member */ | |
519 | if (ioctl(fd, SET_DISK_FAULTY, (unsigned long) stb.st_rdev)) { | |
520 | fprintf(stderr, Name ": set device faulty failed for %s: %s\n", | |
521 | dnprintable, strerror(errno)); | |
522 | return 1; | |
523 | } | |
524 | if (verbose >= 0) | |
525 | fprintf(stderr, Name ": set %s faulty in %s\n", | |
526 | dnprintable, devname); | |
527 | break; | |
528 | } | |
529 | } | |
530 | return 0; | |
531 | ||
532 | } | |
533 | ||
534 | int autodetect(void) | |
535 | { | |
536 | /* Open any md device, and issue the RAID_AUTORUN ioctl */ | |
537 | int rv = 1; | |
538 | int fd = dev_open("9:0", O_RDONLY); | |
539 | if (fd >= 0) { | |
540 | if (ioctl(fd, RAID_AUTORUN, 0) == 0) | |
541 | rv = 0; | |
542 | close(fd); | |
543 | } | |
544 | return rv; | |
545 | } | |
546 | #endif |