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Commit | Line | Data |
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b5e64645 NB |
1 | /* |
2 | * mdadm - manage Linux "md" devices aka RAID arrays. | |
3 | * | |
6f02172d | 4 | * Copyright (C) 2001-2013 Neil Brown <neilb@suse.de> |
b5e64645 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 | |
e736b623 | 22 | * Email: <neilb@suse.de> |
b5e64645 NB |
23 | */ |
24 | ||
25 | #include "mdadm.h" | |
9935cf0f | 26 | #include "udev.h" |
b5e64645 NB |
27 | #include "md_p.h" |
28 | #include <ctype.h> | |
29 | ||
c4fe2d4f | 30 | void make_parts(char *dev, int cnt) |
b5e64645 NB |
31 | { |
32 | /* make 'cnt' partition devices for 'dev' | |
c4fe2d4f N |
33 | * If dev is a device name we use the |
34 | * major/minor from dev and add 1..cnt | |
35 | * If it is a symlink, we make similar symlinks. | |
8d80900b | 36 | * If dev ends with a digit, we add "p%d" else "%d" |
b5e64645 NB |
37 | * If the name exists, we use it's owner/mode, |
38 | * else that of dev | |
39 | */ | |
40 | struct stat stb; | |
96ae5973 JS |
41 | int major_num; |
42 | int minor_num; | |
43 | int odig; | |
b5e64645 | 44 | int i; |
8f23b0b3 | 45 | int nlen = strlen(dev) + 20; |
0eb26465 | 46 | char *name; |
b5e64645 | 47 | int dig = isdigit(dev[strlen(dev)-1]); |
c1b78589 | 48 | char orig[1001]; |
c4fe2d4f | 49 | char sym[1024]; |
614825ea | 50 | int err; |
b5e64645 | 51 | |
ca3b6696 N |
52 | if (cnt == 0) |
53 | cnt = 4; | |
c4fe2d4f | 54 | if (lstat(dev, &stb)!= 0) |
b5e64645 | 55 | return; |
0eb26465 | 56 | |
96ae5973 JS |
57 | if (S_ISBLK(stb.st_mode)) { |
58 | major_num = major(stb.st_rdev); | |
59 | minor_num = minor(stb.st_rdev); | |
60 | odig = -1; | |
61 | } else if (S_ISLNK(stb.st_mode)) { | |
c1b78589 JS |
62 | int len; |
63 | ||
64 | len = readlink(dev, orig, sizeof(orig)); | |
65 | if (len < 0 || len >= (int)sizeof(orig)) | |
c4fe2d4f N |
66 | return; |
67 | orig[len] = 0; | |
68 | odig = isdigit(orig[len-1]); | |
96ae5973 JS |
69 | major_num = -1; |
70 | minor_num = -1; | |
c4fe2d4f | 71 | } else |
96ae5973 | 72 | return; |
503975b9 | 73 | name = xmalloc(nlen); |
ca3b6696 | 74 | for (i = 1; i <= cnt ; i++) { |
b5e64645 | 75 | struct stat stb2; |
8f23b0b3 | 76 | snprintf(name, nlen, "%s%s%d", dev, dig?"p":"", i); |
ca3b6696 | 77 | if (stat(name, &stb2) == 0) { |
96ae5973 | 78 | if (!S_ISBLK(stb2.st_mode) || !S_ISBLK(stb.st_mode)) |
b5e64645 | 79 | continue; |
b440882e | 80 | if (stb2.st_rdev == makedev(major_num, minor_num+i)) |
b5e64645 NB |
81 | continue; |
82 | unlink(name); | |
83 | } else { | |
84 | stb2 = stb; | |
85 | } | |
c4fe2d4f N |
86 | if (S_ISBLK(stb.st_mode)) { |
87 | if (mknod(name, S_IFBLK | 0600, | |
88 | makedev(major_num, minor_num+i))) | |
89 | perror("mknod"); | |
90 | if (chown(name, stb2.st_uid, stb2.st_gid)) | |
91 | perror("chown"); | |
92 | if (chmod(name, stb2.st_mode & 07777)) | |
93 | perror("chmod"); | |
614825ea | 94 | err = 0; |
c4fe2d4f | 95 | } else { |
e10a79c3 | 96 | snprintf(sym, sizeof(sym), "%s%s%d", orig, odig?"p":"", i); |
614825ea | 97 | err = symlink(sym, name); |
c4fe2d4f | 98 | } |
614825ea DW |
99 | |
100 | if (err == 0 && stat(name, &stb2) == 0) | |
101 | add_dev(name, &stb2, 0, NULL); | |
b5e64645 | 102 | } |
0eb26465 | 103 | free(name); |
b5e64645 NB |
104 | } |
105 | ||
7105228e ZL |
106 | int create_named_array(char *devnm) |
107 | { | |
108 | int fd; | |
109 | int n = -1; | |
110 | static const char new_array_file[] = { | |
111 | "/sys/module/md_mod/parameters/new_array" | |
112 | }; | |
113 | ||
114 | fd = open(new_array_file, O_WRONLY); | |
115 | if (fd < 0 && errno == ENOENT) { | |
116 | if (system("modprobe md_mod") == 0) | |
117 | fd = open(new_array_file, O_WRONLY); | |
118 | } | |
119 | if (fd >= 0) { | |
120 | n = write(fd, devnm, strlen(devnm)); | |
121 | close(fd); | |
122 | } | |
123 | if (fd < 0 || n != (int)strlen(devnm)) { | |
1a874930 KT |
124 | pr_err("Fail to create %s when using %s, fallback to creation via node\n", |
125 | devnm, new_array_file); | |
7105228e ZL |
126 | return 0; |
127 | } | |
128 | ||
129 | return 1; | |
130 | } | |
131 | ||
b5e64645 | 132 | /* |
69207ff6 N |
133 | * We need a new md device to assemble/build/create an array. |
134 | * 'dev' is a name given us by the user (command line or mdadm.conf) | |
135 | * It might start with /dev or /dev/md any might end with a digit | |
136 | * string. | |
137 | * If it starts with just /dev, it must be /dev/mdX or /dev/md_dX | |
138 | * If it ends with a digit string, then it must be as above, or | |
139 | * 'trustworthy' must be 'METADATA' and the 'dev' must be | |
140 | * /dev/md/'name'NN or 'name'NN | |
141 | * If it doesn't end with a digit string, it must be /dev/md/'name' | |
142 | * or 'name' or must be NULL. | |
143 | * If the digit string is present, it gives the minor number to use | |
144 | * If not, we choose a high, unused minor number. | |
145 | * If the 'dev' is a standard name, it devices whether 'md' or 'mdp'. | |
146 | * else if the name is 'd[0-9]+' then we use mdp | |
147 | * else if trustworthy is 'METADATA' we use md | |
148 | * else the choice depends on 'autof'. | |
149 | * If name is NULL it is assumed to match whatever dev provides. | |
150 | * If both name and dev are NULL, we choose a name 'mdXX' or 'mdpXX' | |
151 | * | |
152 | * If 'name' is given, and 'trustworthy' is 'foreign' and name is not | |
153 | * supported by 'dev', we add a "_%d" suffix based on the minor number | |
154 | * use that. | |
155 | * | |
ca3b6696 | 156 | * If udev is configured, we create a temporary device, open it, and |
69207ff6 | 157 | * unlink it. |
eca944fa | 158 | * If not, we create the /dev/mdXX device, and if name is usable, |
69207ff6 N |
159 | * /dev/md/name |
160 | * In any case we return /dev/md/name or (if that isn't available) | |
161 | * /dev/mdXX in 'chosen'. | |
162 | * | |
163 | * When we create devices, we use uid/gid/umask from config file. | |
b5e64645 | 164 | */ |
69207ff6 N |
165 | |
166 | int create_mddev(char *dev, char *name, int autof, int trustworthy, | |
cd6cbb08 | 167 | char *chosen, int block_udev) |
b5e64645 NB |
168 | { |
169 | int mdfd; | |
170 | struct stat stb; | |
69207ff6 N |
171 | int num = -1; |
172 | int use_mdp = -1; | |
8aec876d | 173 | struct createinfo *ci = conf_get_create_info(); |
f1ae21c4 | 174 | int parts; |
69207ff6 | 175 | char *cname; |
bd1fd72e | 176 | char devname[37]; |
4dd2df09 | 177 | char devnm[32]; |
69207ff6 | 178 | char cbuf[400]; |
cd6cbb08 | 179 | |
9935cf0f | 180 | if (!udev_is_available()) |
cd6cbb08 N |
181 | block_udev = 0; |
182 | ||
69207ff6 N |
183 | if (chosen == NULL) |
184 | chosen = cbuf; | |
185 | ||
5bbb4842 NB |
186 | if (autof == 0) |
187 | autof = ci->autof; | |
188 | ||
f1ae21c4 NB |
189 | parts = autof >> 3; |
190 | autof &= 7; | |
191 | ||
b9ce7ab0 | 192 | strcpy(chosen, DEV_MD_DIR); |
69207ff6 N |
193 | cname = chosen + strlen(chosen); |
194 | ||
69207ff6 | 195 | if (dev) { |
b9ce7ab0 | 196 | if (strncmp(dev, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0) { |
dd5ab402 | 197 | snprintf(cname, MD_NAME_MAX, "%s", dev + DEV_MD_DIR_LEN); |
69207ff6 N |
198 | } else if (strncmp(dev, "/dev/", 5) == 0) { |
199 | char *e = dev + strlen(dev); | |
200 | while (e > dev && isdigit(e[-1])) | |
201 | e--; | |
202 | if (e[0]) | |
203 | num = strtoul(e, NULL, 10); | |
dd5ab402 | 204 | snprintf(cname, MD_NAME_MAX, "%s", dev + 5); |
69207ff6 N |
205 | cname[e-(dev+5)] = 0; |
206 | /* name *must* be mdXX or md_dXX in this context */ | |
207 | if (num < 0 || | |
208 | (strcmp(cname, "md") != 0 && strcmp(cname, "md_d") != 0)) { | |
7a862a02 | 209 | pr_err("%s is an invalid name for an md device. Try /dev/md/%s\n", |
69207ff6 | 210 | dev, dev+5); |
f1ae21c4 NB |
211 | return -1; |
212 | } | |
69207ff6 N |
213 | if (strcmp(cname, "md") == 0) |
214 | use_mdp = 0; | |
215 | else | |
216 | use_mdp = 1; | |
11fb4c05 N |
217 | /* recreate name: /dev/md/0 or /dev/md/d0 */ |
218 | sprintf(cname, "%s%d", use_mdp?"d":"", num); | |
69207ff6 N |
219 | } else |
220 | strcpy(cname, dev); | |
221 | ||
11fb4c05 N |
222 | /* 'cname' must not contain a slash, and may not be |
223 | * empty. | |
69207ff6 | 224 | */ |
11fb4c05 | 225 | if (strchr(cname, '/') != NULL) { |
7a862a02 | 226 | pr_err("%s is an invalid name for an md device.\n", dev); |
69207ff6 | 227 | return -1; |
f1ae21c4 | 228 | } |
11fb4c05 | 229 | if (cname[0] == 0) { |
8e5b52cd | 230 | pr_err("%s is an invalid name for an md device (empty!).\n", dev); |
69207ff6 | 231 | return -1; |
b5e64645 | 232 | } |
11fb4c05 N |
233 | if (num < 0) { |
234 | /* If cname is 'N' or 'dN', we get dev number | |
235 | * from there. | |
236 | */ | |
237 | char *sp = cname; | |
238 | char *ep; | |
239 | if (cname[0] == 'd') | |
240 | sp++; | |
4cda8682 JM |
241 | if (isdigit(sp[0])) |
242 | num = strtoul(sp, &ep, 10); | |
243 | else | |
244 | ep = sp; | |
11fb4c05 N |
245 | if (ep == sp || *ep || num < 0) |
246 | num = -1; | |
247 | else if (cname[0] == 'd') | |
248 | use_mdp = 1; | |
249 | else | |
250 | use_mdp = 0; | |
251 | } | |
69207ff6 | 252 | } |
f1ae21c4 | 253 | |
69207ff6 N |
254 | /* Now determine device number */ |
255 | /* named 'METADATA' cannot use 'mdp'. */ | |
256 | if (name && name[0] == 0) | |
257 | name = NULL; | |
258 | if (name && trustworthy == METADATA && use_mdp == 1) { | |
7a862a02 | 259 | pr_err("%s is not allowed for a %s container. Consider /dev/md%d.\n", dev, name, num); |
69207ff6 N |
260 | return -1; |
261 | } | |
262 | if (name && trustworthy == METADATA) | |
263 | use_mdp = 0; | |
264 | if (use_mdp == -1) { | |
265 | if (autof == 4 || autof == 6) | |
266 | use_mdp = 1; | |
f1ae21c4 | 267 | else |
69207ff6 N |
268 | use_mdp = 0; |
269 | } | |
270 | if (num < 0 && trustworthy == LOCAL && name) { | |
ca3b6696 | 271 | /* if name is numeric, possibly prefixed by |
d7ba0c55 | 272 | * 'md' or '/dev/md', use that for num |
bde2c6e2 | 273 | * if it is not already in use */ |
69207ff6 | 274 | char *ep; |
d7ba0c55 N |
275 | char *n2 = name; |
276 | if (strncmp(n2, "/dev/", 5) == 0) | |
277 | n2 += 5; | |
278 | if (strncmp(n2, "md", 2) == 0) | |
279 | n2 += 2; | |
280 | if (*n2 == '/') | |
281 | n2++; | |
282 | num = strtoul(n2, &ep, 10); | |
283 | if (ep == n2 || *ep) | |
69207ff6 | 284 | num = -1; |
4dd2df09 N |
285 | else { |
286 | sprintf(devnm, "md%s%d", use_mdp ? "_d":"", num); | |
287 | if (mddev_busy(devnm)) | |
288 | num = -1; | |
289 | } | |
69207ff6 N |
290 | } |
291 | ||
69207ff6 N |
292 | if (cname[0] == 0 && name) { |
293 | /* Need to find a name if we can | |
294 | * We don't completely trust 'name'. Truncate to | |
295 | * reasonable length and remove '/' | |
8d80900b | 296 | */ |
69207ff6 | 297 | char *cp; |
f2e55ecc N |
298 | struct map_ent *map = NULL; |
299 | int conflict = 1; | |
300 | int unum = 0; | |
301 | int cnlen; | |
69207ff6 N |
302 | strncpy(cname, name, 200); |
303 | cname[200] = 0; | |
7103b9b8 N |
304 | for (cp = cname; *cp ; cp++) |
305 | switch (*cp) { | |
306 | case '/': | |
307 | *cp = '-'; | |
308 | break; | |
309 | case ' ': | |
310 | case '\t': | |
311 | *cp = '_'; | |
312 | break; | |
313 | } | |
314 | ||
f2e55ecc N |
315 | if (trustworthy == LOCAL || |
316 | (trustworthy == FOREIGN && strchr(cname, ':') != NULL)) { | |
317 | /* Only need suffix if there is a conflict */ | |
318 | if (map_by_name(&map, cname) == NULL) | |
319 | conflict = 0; | |
320 | } | |
321 | cnlen = strlen(cname); | |
322 | while (conflict) { | |
add394f3 | 323 | if (trustworthy == METADATA && !isdigit(cname[cnlen-1])) |
f2e55ecc N |
324 | sprintf(cname+cnlen, "%d", unum); |
325 | else | |
ca3b6696 | 326 | /* add _%d to FOREIGN array that don't |
f2e55ecc N |
327 | * a 'host:' prefix |
328 | */ | |
329 | sprintf(cname+cnlen, "_%d", unum); | |
330 | unum++; | |
331 | if (map_by_name(&map, cname) == NULL) | |
332 | conflict = 0; | |
333 | } | |
69207ff6 | 334 | } |
9a40c327 | 335 | |
eca944fa N |
336 | devnm[0] = 0; |
337 | if (num < 0 && cname && ci->names) { | |
eca944fa | 338 | sprintf(devnm, "md_%s", cname); |
9f376da6 MG |
339 | if (block_udev && udev_block(devnm) != UDEV_STATUS_SUCCESS) |
340 | return -1; | |
7105228e | 341 | if (!create_named_array(devnm)) { |
eca944fa | 342 | devnm[0] = 0; |
cd6cbb08 N |
343 | udev_unblock(); |
344 | } | |
eca944fa | 345 | } |
039df362 | 346 | if (num >= 0) { |
039df362 | 347 | sprintf(devnm, "md%d", num); |
9f376da6 MG |
348 | if (block_udev && udev_block(devnm) != UDEV_STATUS_SUCCESS) |
349 | return -1; | |
7105228e | 350 | if (!create_named_array(devnm)) { |
039df362 | 351 | devnm[0] = 0; |
cd6cbb08 | 352 | udev_unblock(); |
eca944fa | 353 | } |
cd6cbb08 N |
354 | } |
355 | if (devnm[0] == 0) { | |
356 | if (num < 0) { | |
357 | /* need to choose a free number. */ | |
358 | char *_devnm = find_free_devnm(use_mdp); | |
359 | if (_devnm == NULL) { | |
360 | pr_err("No avail md devices - aborting\n"); | |
361 | return -1; | |
362 | } | |
363 | strcpy(devnm, _devnm); | |
364 | } else { | |
365 | sprintf(devnm, "%s%d", use_mdp?"md_d":"md", num); | |
366 | if (mddev_busy(devnm)) { | |
367 | pr_err("%s is already in use.\n", | |
368 | dev); | |
369 | return -1; | |
370 | } | |
eca944fa | 371 | } |
9f376da6 MG |
372 | if (block_udev && udev_block(devnm) != UDEV_STATUS_SUCCESS) |
373 | return -1; | |
2e10c46d | 374 | create_named_array(devnm); |
eca944fa N |
375 | } |
376 | ||
377 | sprintf(devname, "/dev/%s", devnm); | |
378 | ||
5ac6db12 | 379 | if (dev && dev[0] == '/') |
9a40c327 N |
380 | strcpy(chosen, dev); |
381 | else if (cname[0] == 0) | |
69207ff6 | 382 | strcpy(chosen, devname); |
8d80900b | 383 | |
69207ff6 | 384 | /* We have a device number and name. |
11fb4c05 N |
385 | * If we cannot detect udev, we need to make |
386 | * devices and links ourselves. | |
69207ff6 | 387 | */ |
9935cf0f | 388 | if (!udev_is_available()) { |
69207ff6 N |
389 | /* Make sure 'devname' exists and 'chosen' is a symlink to it */ |
390 | if (lstat(devname, &stb) == 0) { | |
391 | /* Must be the correct device, else error */ | |
392 | if ((stb.st_mode&S_IFMT) != S_IFBLK || | |
13db17bd | 393 | stb.st_rdev != devnm2devid(devnm)) { |
e7b84f9d | 394 | pr_err("%s exists but looks wrong, please fix\n", |
69207ff6 N |
395 | devname); |
396 | return -1; | |
0a6e1c67 | 397 | } |
69207ff6 N |
398 | } else { |
399 | if (mknod(devname, S_IFBLK|0600, | |
4dd2df09 | 400 | devnm2devid(devnm)) != 0) { |
e7b84f9d | 401 | pr_err("failed to create %s\n", |
69207ff6 | 402 | devname); |
b5e64645 NB |
403 | return -1; |
404 | } | |
69207ff6 N |
405 | if (chown(devname, ci->uid, ci->gid)) |
406 | perror("chown"); | |
407 | if (chmod(devname, ci->mode)) | |
408 | perror("chmod"); | |
409 | stat(devname, &stb); | |
410 | add_dev(devname, &stb, 0, NULL); | |
411 | } | |
c4fe2d4f N |
412 | if (use_mdp == 1) |
413 | make_parts(devname, parts); | |
69207ff6 | 414 | |
ca3b6696 | 415 | if (strcmp(chosen, devname) != 0) { |
0f8347d4 MT |
416 | if (mkdir(DEV_NUM_PREF, 0700) == 0) { |
417 | if (chown(DEV_NUM_PREF, ci->uid, ci->gid)) | |
418 | perror("chown " DEV_NUM_PREF); | |
419 | if (chmod(DEV_NUM_PREF, ci->mode | ((ci->mode >> 2) & 0111))) | |
420 | perror("chmod " DEV_NUM_PREF); | |
8d80900b | 421 | } |
69207ff6 N |
422 | |
423 | if (dev && strcmp(chosen, dev) == 0) | |
424 | /* We know we are allowed to use this name */ | |
425 | unlink(chosen); | |
426 | ||
427 | if (lstat(chosen, &stb) == 0) { | |
428 | char buf[300]; | |
fca13185 TJ |
429 | ssize_t link_len = readlink(chosen, buf, sizeof(buf)-1); |
430 | if (link_len >= 0) | |
431 | buf[link_len] = '\0'; | |
432 | ||
69207ff6 | 433 | if ((stb.st_mode & S_IFMT) != S_IFLNK || |
fca13185 | 434 | link_len < 0 || |
69207ff6 | 435 | strcmp(buf, devname) != 0) { |
e7b84f9d | 436 | pr_err("%s exists - ignoring\n", |
69207ff6 N |
437 | chosen); |
438 | strcpy(chosen, devname); | |
439 | } | |
614825ea | 440 | } else if (symlink(devname, chosen) != 0) |
e7b84f9d | 441 | pr_err("failed to create %s: %s\n", |
614825ea | 442 | chosen, strerror(errno)); |
c4fe2d4f N |
443 | if (use_mdp && strcmp(chosen, devname) != 0) |
444 | make_parts(chosen, parts); | |
b5e64645 | 445 | } |
b5e64645 | 446 | } |
4dd2df09 | 447 | mdfd = open_dev_excl(devnm); |
69207ff6 | 448 | if (mdfd < 0) |
e7b84f9d | 449 | pr_err("unexpected failure opening %s\n", |
69207ff6 | 450 | devname); |
6be1d39d N |
451 | return mdfd; |
452 | } | |
453 | ||
454 | /* Open this and check that it is an md device. | |
455 | * On success, return filedescriptor. | |
456 | * On failure, return -1 if it doesn't exist, | |
457 | * or -2 if it exists but is not an md device. | |
458 | */ | |
459 | int open_mddev(char *dev, int report_errors) | |
460 | { | |
f71d2b8f | 461 | int mdfd = open(dev, O_RDONLY); |
40b054e1 | 462 | |
6be1d39d N |
463 | if (mdfd < 0) { |
464 | if (report_errors) | |
e7b84f9d | 465 | pr_err("error opening %s: %s\n", |
6be1d39d N |
466 | dev, strerror(errno)); |
467 | return -1; | |
468 | } | |
40b054e1 | 469 | |
9db2ab4e | 470 | if (md_array_valid(mdfd) == 0) { |
b5e64645 | 471 | close(mdfd); |
6be1d39d | 472 | if (report_errors) |
7a862a02 | 473 | pr_err("%s does not appear to be an md device\n", dev); |
6be1d39d | 474 | return -2; |
b5e64645 | 475 | } |
40b054e1 | 476 | |
b5e64645 NB |
477 | return mdfd; |
478 | } | |
289c74f8 | 479 | |
e702f392 KT |
480 | /** |
481 | * is_mddev() - check that file name passed is an md device. | |
482 | * @dev: file name that has to be checked. | |
483 | * Return: 1 if file passed is an md device, 0 if not. | |
484 | */ | |
485 | int is_mddev(char *dev) | |
486 | { | |
487 | int fd = open_mddev(dev, 1); | |
488 | ||
489 | if (fd >= 0) { | |
490 | close(fd); | |
491 | return 1; | |
492 | } | |
493 | ||
494 | return 0; | |
495 | } | |
496 | ||
289c74f8 N |
497 | char *find_free_devnm(int use_partitions) |
498 | { | |
499 | static char devnm[32]; | |
500 | int devnum; | |
501 | for (devnum = 127; devnum != 128; | |
2e466cce | 502 | devnum = devnum ? devnum-1 : (1<<9)-1) { |
289c74f8 N |
503 | |
504 | if (use_partitions) | |
505 | sprintf(devnm, "md_d%d", devnum); | |
506 | else | |
507 | sprintf(devnm, "md%d", devnum); | |
508 | if (mddev_busy(devnm)) | |
509 | continue; | |
510 | if (!conf_name_is_free(devnm)) | |
511 | continue; | |
9935cf0f | 512 | if (!udev_is_available()) { |
289c74f8 N |
513 | /* make sure it is new to /dev too, at least as a |
514 | * non-standard */ | |
13db17bd | 515 | dev_t devid = devnm2devid(devnm); |
289c74f8 N |
516 | if (devid) { |
517 | char *dn = map_dev(major(devid), | |
518 | minor(devid), 0); | |
519 | if (dn && ! is_standard(dn, NULL)) | |
520 | continue; | |
521 | } | |
522 | } | |
523 | break; | |
524 | } | |
525 | if (devnum == 128) | |
526 | return NULL; | |
527 | return devnm; | |
528 | } |