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[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 } else if (runstop < 0){
110 if (ioctl(fd, STOP_ARRAY, NULL)) {
111 if (quiet==0)
112 fprintf(stderr, Name ": fail to stop array %s: %s\n",
113 devname, strerror(errno));
114 return 1;
115 }
116 if (quiet <= 0)
117 fprintf(stderr, Name ": stopped %s\n", devname);
118 }
119 return 0;
120 }
121
122 int Manage_resize(char *devname, int fd, long long size, int raid_disks)
123 {
124 mdu_array_info_t info;
125 if (ioctl(fd, GET_ARRAY_INFO, &info) != 0) {
126 fprintf(stderr, Name ": Cannot get array information for %s: %s\n",
127 devname, strerror(errno));
128 return 1;
129 }
130 if (size >= 0)
131 info.size = size;
132 if (raid_disks > 0)
133 info.raid_disks = raid_disks;
134 if (ioctl(fd, SET_ARRAY_INFO, &info) != 0) {
135 fprintf(stderr, Name ": Cannot set device size/shape for %s: %s\n",
136 devname, strerror(errno));
137 return 1;
138 }
139 return 0;
140 }
141
142 int Manage_reconfig(char *devname, int fd, int layout)
143 {
144 mdu_array_info_t info;
145 if (ioctl(fd, GET_ARRAY_INFO, &info) != 0) {
146 fprintf(stderr, Name ": Cannot get array information for %s: %s\n",
147 devname, strerror(errno));
148 return 1;
149 }
150 info.layout = layout;
151 printf("layout set to %d\n", info.layout);
152 if (ioctl(fd, SET_ARRAY_INFO, &info) != 0) {
153 fprintf(stderr, Name ": Cannot set layout for %s: %s\n",
154 devname, strerror(errno));
155 return 1;
156 }
157 return 0;
158 }
159
160 int Manage_subdevs(char *devname, int fd,
161 mddev_dev_t devlist, int verbose)
162 {
163 /* do something to each dev.
164 * devmode can be
165 * 'a' - add the device
166 * try HOT_ADD_DISK
167 * If that fails EINVAL, try ADD_NEW_DISK
168 * 'r' - remove the device HOT_REMOVE_DISK
169 * 'f' - set the device faulty SET_DISK_FAULTY
170 */
171 mdu_array_info_t array;
172 mdu_disk_info_t disc;
173 mddev_dev_t dv;
174 struct stat stb;
175 int j;
176 int tfd;
177 struct supertype *st;
178 void *dsuper = NULL;
179 void *osuper = NULL; /* original super */
180 int duuid[4];
181 int ouuid[4];
182
183 if (ioctl(fd, GET_ARRAY_INFO, &array)) {
184 fprintf(stderr, Name ": cannot get array info for %s\n",
185 devname);
186 return 1;
187 }
188 for (dv = devlist ; dv; dv=dv->next) {
189 unsigned long long ldsize;
190 unsigned long dsize;
191
192 if (stat(dv->devname, &stb)) {
193 fprintf(stderr, Name ": cannot find %s: %s\n",
194 dv->devname, strerror(errno));
195 return 1;
196 }
197 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
198 fprintf(stderr, Name ": %s is not a block device.\n",
199 dv->devname);
200 return 1;
201 }
202 switch(dv->disposition){
203 default:
204 fprintf(stderr, Name ": internal error - devmode[%s]=%d\n",
205 dv->devname, dv->disposition);
206 return 1;
207 case 'a':
208 /* add the device */
209 st = super_by_version(array.major_version,
210 array.minor_version);
211 if (!st) {
212 fprintf(stderr, Name ": unsupport array - version %d.%d\n",
213 array.major_version, array.minor_version);
214 return 1;
215 }
216
217 /* Make sure it isn't in use (in 2.6 or later) */
218 tfd = open(dv->devname, O_RDONLY|O_EXCL);
219 if (tfd < 0) {
220 fprintf(stderr, Name ": Cannot open %s: %s\n",
221 dv->devname, strerror(errno));
222 return 1;
223 }
224 if (array.not_persistent==0)
225 st->ss->load_super(st, tfd, &osuper, NULL);
226 /* will use osuper later */
227 #ifdef BLKGETSIZE64
228 if (ioctl(tfd, BLKGETSIZE64, &ldsize)==0)
229 ;
230 else
231 #endif
232 if (ioctl(tfd, BLKGETSIZE, &dsize)) {
233 fprintf(stderr, Name ": Cannot get size of %s: %s\n",
234 dv->devname, strerror(errno));
235 close(tfd);
236 return 1;
237 } else {
238 ldsize = dsize;
239 ldsize <<= 9;
240 }
241 close(tfd);
242
243 if (array.major_version == 0 &&
244 md_get_version(fd)%100 < 2) {
245 if (ioctl(fd, HOT_ADD_DISK,
246 (unsigned long)stb.st_rdev)==0) {
247 if (verbose >= 0)
248 fprintf(stderr, Name ": hot added %s\n",
249 dv->devname);
250 continue;
251 }
252
253 fprintf(stderr, Name ": hot add failed for %s: %s\n",
254 dv->devname, strerror(errno));
255 return 1;
256 }
257
258 if (array.not_persistent == 0) {
259
260 /* Make sure device is large enough */
261 if (st->ss->avail_size(st, ldsize/512) <
262 array.size) {
263 fprintf(stderr, Name ": %s not large enough to join array\n",
264 dv->devname);
265 return 1;
266 }
267
268 /* need to find a sample superblock to copy, and
269 * a spare slot to use
270 */
271 for (j=0; j<st->max_devs; j++) {
272 char *dev;
273 int dfd;
274 disc.number = j;
275 if (ioctl(fd, GET_DISK_INFO, &disc))
276 continue;
277 if (disc.major==0 && disc.minor==0)
278 continue;
279 if ((disc.state & 4)==0) continue; /* sync */
280 /* Looks like a good device to try */
281 dev = map_dev(disc.major, disc.minor, 1);
282 if (!dev) continue;
283 dfd = dev_open(dev, O_RDONLY);
284 if (dfd < 0) continue;
285 if (st->ss->load_super(st, dfd, &dsuper, NULL)) {
286 close(dfd);
287 continue;
288 }
289 remove_partitions(dfd);
290 close(dfd);
291 break;
292 }
293 if (!dsuper) {
294 fprintf(stderr, Name ": cannot find valid superblock in this array - HELP\n");
295 return 1;
296 }
297 /* Possibly this device was recently part of the array
298 * and was temporarily removed, and is now being re-added.
299 * If so, we can simply re-add it.
300 */
301 st->ss->uuid_from_super(duuid, dsuper);
302
303 /* re-add doesn't work for version-1 superblocks
304 * before 2.6.18 :-(
305 */
306 if (array.major_version == 1 &&
307 get_linux_version() <= 2006018)
308 ;
309 else if (osuper) {
310 st->ss->uuid_from_super(ouuid, osuper);
311 if (memcmp(duuid, ouuid, sizeof(ouuid))==0) {
312 /* look close enough for now. Kernel
313 * will worry about where a bitmap
314 * based reconstruct is possible
315 */
316 struct mdinfo mdi;
317 st->ss->getinfo_super(&mdi, osuper);
318 disc.major = major(stb.st_rdev);
319 disc.minor = minor(stb.st_rdev);
320 disc.number = mdi.disk.number;
321 disc.raid_disk = mdi.disk.raid_disk;
322 disc.state = mdi.disk.state;
323 if (ioctl(fd, ADD_NEW_DISK, &disc) == 0) {
324 if (verbose >= 0)
325 fprintf(stderr, Name ": re-added %s\n", dv->devname);
326 continue;
327 }
328 /* fall back on normal-add */
329 }
330 }
331 } else {
332 /* non-persistent. Must ensure that new drive
333 * is at least array.size big.
334 */
335 if (ldsize/512 < array.size) {
336 fprintf(stderr, Name ": %s not large enough to join array\n",
337 dv->devname);
338 return 1;
339 }
340 }
341 /* in 2.6.17 and earlier, version-1 superblocks won't
342 * use the number we write, but will choose a free number.
343 * we must choose the same free number, which requires
344 * starting at 'raid_disks' and counting up
345 */
346 for (j = array.raid_disks; j< st->max_devs; j++) {
347 disc.number = j;
348 if (ioctl(fd, GET_DISK_INFO, &disc))
349 break;
350 if (disc.major==0 && disc.minor==0)
351 break;
352 if (disc.state & 8) /* removed */
353 break;
354 }
355 disc.major = major(stb.st_rdev);
356 disc.minor = minor(stb.st_rdev);
357 disc.number =j;
358 disc.state = 0;
359 if (array.not_persistent==0) {
360 if (dv->writemostly)
361 disc.state |= 1 << MD_DISK_WRITEMOSTLY;
362 st->ss->add_to_super(dsuper, &disc);
363 if (st->ss->write_init_super(st, dsuper, &disc, dv->devname))
364 return 1;
365 } else if (dv->re_add) {
366 /* this had better be raid1.
367 * As we are "--re-add"ing we must find a spare slot
368 * to fill.
369 */
370 char *used = malloc(array.raid_disks);
371 memset(used, 0, array.raid_disks);
372 for (j=0; j< st->max_devs; j++) {
373 mdu_disk_info_t disc2;
374 disc2.number = j;
375 if (ioctl(fd, GET_DISK_INFO, &disc2))
376 continue;
377 if (disc2.major==0 && disc2.minor==0)
378 continue;
379 if (disc2.state & 8) /* removed */
380 continue;
381 if (disc2.raid_disk < 0)
382 continue;
383 if (disc2.raid_disk > array.raid_disks)
384 continue;
385 used[disc2.raid_disk] = 1;
386 }
387 for (j=0 ; j<array.raid_disks; j++)
388 if (!used[j]) {
389 disc.raid_disk = j;
390 disc.state |= (1<<MD_DISK_SYNC);
391 break;
392 }
393 }
394 if (dv->writemostly)
395 disc.state |= (1 << MD_DISK_WRITEMOSTLY);
396 if (ioctl(fd,ADD_NEW_DISK, &disc)) {
397 fprintf(stderr, Name ": add new device failed for %s as %d: %s\n",
398 dv->devname, j, strerror(errno));
399 return 1;
400 }
401 if (verbose >= 0)
402 fprintf(stderr, Name ": added %s\n", dv->devname);
403 break;
404
405 case 'r':
406 /* hot remove */
407 /* FIXME check that it is a current member */
408 if (ioctl(fd, HOT_REMOVE_DISK, (unsigned long)stb.st_rdev)) {
409 fprintf(stderr, Name ": hot remove failed for %s: %s\n",
410 dv->devname, strerror(errno));
411 return 1;
412 }
413 if (verbose >= 0)
414 fprintf(stderr, Name ": hot removed %s\n", dv->devname);
415 break;
416
417 case 'f': /* set faulty */
418 /* FIXME check current member */
419 if (ioctl(fd, SET_DISK_FAULTY, (unsigned long) stb.st_rdev)) {
420 fprintf(stderr, Name ": set device faulty failed for %s: %s\n",
421 dv->devname, strerror(errno));
422 return 1;
423 }
424 if (verbose >= 0)
425 fprintf(stderr, Name ": set %s faulty in %s\n",
426 dv->devname, devname);
427 break;
428 }
429 }
430 return 0;
431
432 }
433 #endif
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