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Commit | Line | Data |
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64c4757e | 1 | /* |
9a9dab36 | 2 | * mdadm - manage Linux "md" devices aka RAID arrays. |
64c4757e | 3 | * |
cd29a5c8 | 4 | * Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au> |
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" |
64c4757e NB |
31 | #include "md_p.h" |
32 | #include <sys/utsname.h> | |
98c6faba | 33 | #include <ctype.h> |
64c4757e NB |
34 | |
35 | /* | |
36 | * Parse a 128 bit uuid in 4 integers | |
37 | * format is 32 hexx nibbles with options :.<space> separator | |
38 | * If not exactly 32 hex digits are found, return 0 | |
39 | * else return 1 | |
40 | */ | |
41 | int parse_uuid(char *str, int uuid[4]) | |
42 | { | |
43 | int hit = 0; /* number of Hex digIT */ | |
44 | int i; | |
45 | char c; | |
46 | for (i=0; i<4; i++) uuid[i]=0; | |
47 | ||
48 | while ((c= *str++)) { | |
49 | int n; | |
50 | if (c>='0' && c<='9') | |
51 | n = c-'0'; | |
52 | else if (c>='a' && c <= 'f') | |
53 | n = 10 + c - 'a'; | |
54 | else if (c>='A' && c <= 'F') | |
55 | n = 10 + c - 'A'; | |
56 | else if (strchr(":. -", c)) | |
57 | continue; | |
58 | else return 0; | |
59 | ||
82b27616 NB |
60 | if (hit<32) { |
61 | uuid[hit/8] <<= 4; | |
62 | uuid[hit/8] += n; | |
63 | } | |
64c4757e NB |
64 | hit++; |
65 | } | |
66 | if (hit == 32) | |
67 | return 1; | |
68 | return 0; | |
69 | ||
70 | } | |
71 | ||
72 | ||
73 | /* | |
74 | * Get the md version number. | |
75 | * We use the RAID_VERSION ioctl if it is supported | |
76 | * If not, but we have a block device with major '9', we assume | |
77 | * 0.36.0 | |
78 | * | |
79 | * Return version number as 24 but number - assume version parts | |
80 | * always < 255 | |
81 | */ | |
82 | ||
83 | int md_get_version(int fd) | |
84 | { | |
85 | struct stat stb; | |
86 | mdu_version_t vers; | |
87 | ||
88 | if (fstat(fd, &stb)<0) | |
89 | return -1; | |
90 | if ((S_IFMT&stb.st_mode) != S_IFBLK) | |
91 | return -1; | |
92 | ||
93 | if (ioctl(fd, RAID_VERSION, &vers) == 0) | |
682c7051 | 94 | return (vers.major*10000) + (vers.minor*100) + vers.patchlevel; |
5787fa49 NB |
95 | if (errno == EACCES) |
96 | return -1; | |
0df46c2a | 97 | if (major(stb.st_rdev) == MD_MAJOR) |
682c7051 | 98 | return (3600); |
64c4757e NB |
99 | return -1; |
100 | } | |
101 | ||
102 | ||
103 | int get_linux_version() | |
104 | { | |
105 | struct utsname name; | |
98c6faba | 106 | char *cp; |
64c4757e NB |
107 | int a,b,c; |
108 | if (uname(&name) <0) | |
109 | return -1; | |
110 | ||
98c6faba NB |
111 | cp = name.release; |
112 | a = strtoul(cp, &cp, 10); | |
113 | if (*cp != '.') return -1; | |
114 | b = strtoul(cp+1, &cp, 10); | |
115 | if (*cp != '.') return -1; | |
116 | c = strtoul(cp+1, NULL, 10); | |
117 | ||
682c7051 | 118 | return (a*1000000)+(b*1000)+c; |
64c4757e NB |
119 | } |
120 | ||
121 | int enough(int level, int raid_disks, int avail_disks) | |
122 | { | |
123 | switch (level) { | |
e5329c37 NB |
124 | case 10: return 1; /* a lie, but it is hard to tell */ |
125 | ||
e0d19036 NB |
126 | case -4: |
127 | return avail_disks>= 1; | |
64c4757e NB |
128 | case -1: |
129 | case 0: | |
130 | return avail_disks == raid_disks; | |
131 | case 1: | |
132 | return avail_disks >= 1; | |
133 | case 4: | |
134 | case 5: | |
135 | return avail_disks >= raid_disks-1; | |
98c6faba NB |
136 | case 6: |
137 | return avail_disks >= raid_disks-2; | |
64c4757e NB |
138 | default: |
139 | return 0; | |
140 | } | |
141 | } | |
142 | ||
143 | int same_uuid(int a[4], int b[4]) | |
144 | { | |
145 | if (a[0]==b[0] && | |
146 | a[1]==b[1] && | |
147 | a[2]==b[2] && | |
148 | a[3]==b[3]) | |
149 | return 1; | |
150 | return 0; | |
151 | } | |
152 | ||
153 | void uuid_from_super(int uuid[4], mdp_super_t *super) | |
154 | { | |
155 | uuid[0] = super->set_uuid0; | |
156 | if (super->minor_version >= 90) { | |
157 | uuid[1] = super->set_uuid1; | |
158 | uuid[2] = super->set_uuid2; | |
159 | uuid[3] = super->set_uuid3; | |
160 | } else { | |
161 | uuid[1] = 0; | |
162 | uuid[2] = 0; | |
163 | uuid[3] = 0; | |
164 | } | |
165 | } | |
166 | ||
167 | int compare_super(mdp_super_t *first, mdp_super_t *second) | |
168 | { | |
169 | /* | |
170 | * return: | |
171 | * 0 same, or first was empty, and second was copied | |
172 | * 1 second had wrong number | |
173 | * 2 wrong uuid | |
174 | * 3 wrong other info | |
175 | */ | |
176 | int uuid1[4], uuid2[4]; | |
177 | if (second->md_magic != MD_SB_MAGIC) | |
178 | return 1; | |
179 | if (first-> md_magic != MD_SB_MAGIC) { | |
180 | memcpy(first, second, sizeof(*first)); | |
181 | return 0; | |
182 | } | |
183 | ||
184 | uuid_from_super(uuid1, first); | |
185 | uuid_from_super(uuid2, second); | |
186 | if (!same_uuid(uuid1, uuid2)) | |
187 | return 2; | |
188 | if (first->major_version != second->major_version || | |
189 | first->minor_version != second->minor_version || | |
190 | first->patch_version != second->patch_version || | |
191 | first->gvalid_words != second->gvalid_words || | |
192 | first->ctime != second->ctime || | |
193 | first->level != second->level || | |
194 | first->size != second->size || | |
195 | first->raid_disks != second->raid_disks ) | |
196 | return 3; | |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
201 | int load_super(int fd, mdp_super_t *super) | |
202 | { | |
203 | /* try to read in the superblock | |
204 | * | |
205 | * return | |
206 | * 0 - success | |
207 | * 1 - no block size | |
208 | * 2 - too small | |
209 | * 3 - no seek | |
210 | * 4 - no read | |
211 | * 5 - no magic | |
212 | * 6 - wrong major version | |
213 | */ | |
e0d19036 | 214 | unsigned long size; |
b5e64645 | 215 | unsigned long long dsize; |
e0d19036 | 216 | unsigned long long offset; |
64c4757e | 217 | |
b5e64645 NB |
218 | #ifdef BLKGETSIZE64 |
219 | if (ioctl(fd, BLKGETSIZE64, &dsize) != 0) | |
220 | #endif | |
221 | { | |
222 | if (ioctl(fd, BLKGETSIZE, &size)) | |
223 | return 1; | |
224 | else | |
225 | dsize = size << 9; | |
226 | } | |
64c4757e | 227 | |
b5e64645 | 228 | if (dsize < MD_RESERVED_SECTORS*2) |
64c4757e NB |
229 | return 2; |
230 | ||
b5e64645 | 231 | offset = MD_NEW_SIZE_SECTORS(dsize>>9); |
64c4757e NB |
232 | |
233 | offset *= 512; | |
234 | ||
5787fa49 NB |
235 | ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */ |
236 | ||
64c4757e NB |
237 | if (lseek64(fd, offset, 0)< 0LL) |
238 | return 3; | |
239 | ||
682c7051 | 240 | if (read(fd, super, sizeof(*super)) != sizeof(*super)) |
64c4757e NB |
241 | return 4; |
242 | ||
243 | if (super->md_magic != MD_SB_MAGIC) | |
244 | return 5; | |
245 | ||
246 | if (super->major_version != 0) | |
247 | return 6; | |
248 | return 0; | |
249 | } | |
250 | ||
82b27616 NB |
251 | int store_super(int fd, mdp_super_t *super) |
252 | { | |
b5e64645 NB |
253 | unsigned long size; |
254 | unsigned long long dsize; | |
255 | ||
82b27616 NB |
256 | long long offset; |
257 | ||
b5e64645 NB |
258 | #ifdef BLKGETSIZE64 |
259 | if (ioctl(fd, BLKGETSIZE64, &dsize) != 0) | |
260 | #endif | |
261 | { | |
262 | if (ioctl(fd, BLKGETSIZE, &size)) | |
263 | return 1; | |
264 | else | |
265 | dsize = ((unsigned long long)size) << 9; | |
266 | } | |
82b27616 | 267 | |
b5e64645 | 268 | if (dsize < MD_RESERVED_SECTORS*2) |
82b27616 NB |
269 | return 2; |
270 | ||
b5e64645 | 271 | offset = MD_NEW_SIZE_SECTORS(dsize>>9); |
82b27616 NB |
272 | |
273 | offset *= 512; | |
274 | ||
275 | if (lseek64(fd, offset, 0)< 0LL) | |
276 | return 3; | |
277 | ||
278 | if (write(fd, super, sizeof(*super)) != sizeof(*super)) | |
279 | return 4; | |
280 | ||
281 | return 0; | |
282 | } | |
283 | ||
284 | ||
682c7051 NB |
285 | |
286 | int check_ext2(int fd, char *name) | |
287 | { | |
288 | /* | |
289 | * Check for an ext2fs file system. | |
290 | * Superblock is always 1K at 1K offset | |
291 | * | |
292 | * s_magic is le16 at 56 == 0xEF53 | |
293 | * report mtime - le32 at 44 | |
294 | * blocks - le32 at 4 | |
295 | * logblksize - le32 at 24 | |
296 | */ | |
297 | unsigned char sb[1024]; | |
298 | time_t mtime; | |
299 | int size, bsize; | |
300 | if (lseek(fd, 1024,0)!= 1024) | |
301 | return 0; | |
302 | if (read(fd, sb, 1024)!= 1024) | |
303 | return 0; | |
304 | if (sb[56] != 0x53 || sb[57] != 0xef) | |
305 | return 0; | |
306 | ||
307 | mtime = sb[44]|(sb[45]|(sb[46]|sb[47]<<8)<<8)<<8; | |
308 | bsize = sb[24]|(sb[25]|(sb[26]|sb[27]<<8)<<8)<<8; | |
309 | size = sb[4]|(sb[5]|(sb[6]|sb[7]<<8)<<8)<<8; | |
310 | fprintf(stderr, Name ": %s appears to contain an ext2fs file system\n", | |
311 | name); | |
312 | fprintf(stderr," size=%dK mtime=%s", | |
313 | size*(1<<bsize), ctime(&mtime)); | |
314 | return 1; | |
315 | } | |
316 | ||
317 | int check_reiser(int fd, char *name) | |
318 | { | |
319 | /* | |
320 | * superblock is at 64K | |
321 | * size is 1024; | |
322 | * Magic string "ReIsErFs" or "ReIsEr2Fs" at 52 | |
323 | * | |
324 | */ | |
325 | unsigned char sb[1024]; | |
326 | int size; | |
327 | if (lseek(fd, 64*1024, 0) != 64*1024) | |
328 | return 0; | |
329 | if (read(fd, sb, 1024) != 1024) | |
330 | return 0; | |
331 | if (strncmp(sb+52, "ReIsErFs",8)!=0 && | |
332 | strncmp(sb+52, "ReIsEr2Fs",9)!=0) | |
333 | return 0; | |
334 | fprintf(stderr, Name ": %s appears to contain a reiserfs file system\n",name); | |
335 | size = sb[0]|(sb[1]|(sb[2]|sb[3]<<8)<<8)<<8; | |
336 | fprintf(stderr, " size = %dK\n", size*4); | |
337 | ||
338 | return 1; | |
339 | } | |
340 | ||
341 | int check_raid(int fd, char *name) | |
342 | { | |
343 | mdp_super_t super; | |
344 | time_t crtime; | |
345 | if (load_super(fd, &super)) | |
346 | return 0; | |
347 | /* Looks like a raid array .. */ | |
5787fa49 | 348 | fprintf(stderr, Name ": %s appears to be part of a raid array:\n", |
682c7051 NB |
349 | name); |
350 | crtime = super.ctime; | |
b83d95f3 | 351 | fprintf(stderr, " level=%d devices=%d ctime=%s", |
682c7051 NB |
352 | super.level, super.raid_disks, ctime(&crtime)); |
353 | return 1; | |
354 | } | |
355 | ||
356 | ||
357 | int ask(char *mesg) | |
358 | { | |
359 | char *add = ""; | |
360 | int i; | |
361 | for (i=0; i<5; i++) { | |
362 | char buf[100]; | |
363 | fprintf(stderr, "%s%s", mesg, add); | |
364 | fflush(stderr); | |
365 | if (fgets(buf, 100, stdin)==NULL) | |
366 | return 0; | |
367 | if (buf[0]=='y' || buf[0]=='Y') | |
368 | return 1; | |
369 | if (buf[0]=='n' || buf[0]=='N') | |
370 | return 0; | |
371 | add = "(y/n) "; | |
372 | } | |
373 | fprintf(stderr, Name ": assuming 'no'\n"); | |
374 | return 0; | |
375 | } | |
376 | ||
377 | char *map_num(mapping_t *map, int num) | |
378 | { | |
379 | while (map->name) { | |
380 | if (map->num == num) | |
381 | return map->name; | |
382 | map++; | |
383 | } | |
384 | return NULL; | |
385 | } | |
386 | ||
387 | int map_name(mapping_t *map, char *name) | |
388 | { | |
389 | while (map->name) { | |
390 | if (strcmp(map->name, name)==0) | |
391 | return map->num; | |
392 | map++; | |
393 | } | |
98c6faba | 394 | return UnSet; |
682c7051 | 395 | } |
82b27616 | 396 | |
e5329c37 | 397 | |
8d80900b | 398 | int is_standard(char *dev, int *nump) |
e5329c37 NB |
399 | { |
400 | /* tests if dev is a "standard" md dev name. | |
401 | * i.e if the last component is "/dNN" or "/mdNN", | |
402 | * where NN is a string of digits | |
403 | */ | |
8d80900b NB |
404 | char *d = strrchr(dev, '/'); |
405 | int type=0; | |
406 | int num; | |
407 | if (!d) | |
e5329c37 | 408 | return 0; |
8d80900b NB |
409 | if (strncmp(d, "/d",2)==0) |
410 | d += 2, type=1; /* /dev/md/dN{pM} */ | |
411 | else if (strncmp(d, "/md_d", 5)==0) | |
412 | d += 5, type=1; /* /dev/md_dNpM */ | |
413 | else if (strncmp(d, "/md", 3)==0) | |
414 | d += 3, type=-1; /* /dev/mdN */ | |
415 | else if (d-dev > 3 && strncmp(d-2, "md/", 3)==0) | |
416 | type = -1; /* /dev/md/N */ | |
e5329c37 NB |
417 | else |
418 | return 0; | |
8d80900b | 419 | if (!*d) |
e5329c37 | 420 | return 0; |
8d80900b NB |
421 | num = atoi(d); |
422 | while (isdigit(*d)) | |
423 | d++; | |
424 | if (*d) | |
e5329c37 | 425 | return 0; |
8d80900b NB |
426 | if (nump) *nump = num; |
427 | ||
428 | return type; | |
e5329c37 NB |
429 | } |
430 | ||
431 | ||
82b27616 NB |
432 | /* |
433 | * convert a major/minor pair for a block device into a name in /dev, if possible. | |
434 | * On the first call, walk /dev collecting name. | |
435 | * Put them in a simple linked listfor now. | |
436 | */ | |
437 | struct devmap { | |
438 | int major, minor; | |
439 | char *name; | |
440 | struct devmap *next; | |
441 | } *devlist = NULL; | |
442 | int devlist_ready = 0; | |
443 | ||
5787fa49 NB |
444 | #ifdef UCLIBC |
445 | char *map_dev(int major, int minor) | |
446 | { | |
447 | #if 0 | |
448 | fprintf(stderr, "Warning - fail to map %d,%d to a device name\n", | |
449 | major, minor); | |
450 | #endif | |
451 | return NULL; | |
452 | } | |
453 | #else | |
82b27616 NB |
454 | #define __USE_XOPEN_EXTENDED |
455 | #include <ftw.h> | |
456 | ||
457 | ||
98c6faba | 458 | #ifndef __dietlibc__ |
82b27616 | 459 | int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s) |
98c6faba NB |
460 | #else |
461 | int add_dev(const char *name, const struct stat *stb, int flag) | |
462 | #endif | |
82b27616 NB |
463 | { |
464 | if ((stb->st_mode&S_IFMT)== S_IFBLK) { | |
465 | char *n = strdup(name); | |
466 | struct devmap *dm = malloc(sizeof(*dm)); | |
467 | if (dm) { | |
0df46c2a NB |
468 | dm->major = major(stb->st_rdev); |
469 | dm->minor = minor(stb->st_rdev); | |
82b27616 NB |
470 | dm->name = n; |
471 | dm->next = devlist; | |
472 | devlist = dm; | |
473 | } | |
474 | } | |
475 | return 0; | |
476 | } | |
477 | ||
dd0781e5 NB |
478 | /* |
479 | * Find a block device with the right major/minor number. | |
8d80900b | 480 | * Avoid /dev/mdNN and /dev/md/dNN if possible |
dd0781e5 | 481 | */ |
82b27616 NB |
482 | char *map_dev(int major, int minor) |
483 | { | |
dd0781e5 NB |
484 | struct devmap *p; |
485 | char *std = NULL; | |
486 | if (!devlist_ready) { | |
98c6faba | 487 | #ifndef __dietlibc__ |
dd0781e5 | 488 | nftw("/dev", add_dev, 10, FTW_PHYS); |
98c6faba | 489 | #else |
dd0781e5 | 490 | ftw("/dev", add_dev, 10); |
98c6faba | 491 | #endif |
dd0781e5 NB |
492 | devlist_ready=1; |
493 | } | |
82b27616 | 494 | |
dd0781e5 NB |
495 | for (p=devlist; p; p=p->next) |
496 | if (p->major == major && | |
497 | p->minor == minor) { | |
8d80900b | 498 | if (is_standard(p->name, NULL)) |
dd0781e5 NB |
499 | std = p->name; |
500 | else | |
501 | return p->name; | |
502 | } | |
503 | return std; | |
82b27616 NB |
504 | } |
505 | ||
5787fa49 | 506 | #endif |
82b27616 | 507 | |
98c6faba | 508 | unsigned long calc_sb_csum(mdp_super_t *super) |
82b27616 NB |
509 | { |
510 | unsigned int oldcsum = super->sb_csum; | |
56eb10c0 | 511 | unsigned long long newcsum = 0; |
82b27616 NB |
512 | unsigned long csum; |
513 | int i; | |
514 | unsigned int *superc = (int*) super; | |
515 | super->sb_csum = 0; | |
516 | ||
517 | for(i=0; i<MD_SB_BYTES/4; i++) | |
518 | newcsum+= superc[i]; | |
519 | csum = (newcsum& 0xffffffff) + (newcsum>>32); | |
520 | super->sb_csum = oldcsum; | |
521 | return csum; | |
522 | } | |
cd29a5c8 | 523 | |
56eb10c0 | 524 | char *human_size(long long bytes) |
cd29a5c8 NB |
525 | { |
526 | static char buf[30]; | |
56eb10c0 | 527 | |
cd29a5c8 | 528 | |
56eb10c0 | 529 | if (bytes < 5000*1024) |
cd29a5c8 | 530 | buf[0]=0; |
56eb10c0 | 531 | else if (bytes < 2*1024LL*1024LL*1024LL) |
e0d19036 | 532 | sprintf(buf, " (%ld.%02ld MiB %ld.%02ld MB)", |
56eb10c0 | 533 | (long)(bytes>>20), |
bd526cee | 534 | (long)((bytes&0xfffff)+0x100000/200)/(0x100000/100), |
56eb10c0 | 535 | (long)(bytes/1000/1000), |
bd526cee | 536 | (long)(((bytes%1000000)+5000)/10000) |
56eb10c0 | 537 | ); |
cd29a5c8 | 538 | else |
e0d19036 | 539 | sprintf(buf, " (%ld.%02ld GiB %ld.%02ld GB)", |
56eb10c0 | 540 | (long)(bytes>>30), |
bd526cee | 541 | (long)(((bytes>>10)&0xfffff)+0x100000/200)/(0x100000/100), |
56eb10c0 | 542 | (long)(bytes/1000LL/1000LL/1000LL), |
5787fa49 | 543 | (long)((((bytes/1000)%1000000)+5000)/10000) |
56eb10c0 | 544 | ); |
cd29a5c8 NB |
545 | return buf; |
546 | } | |
e0d19036 NB |
547 | |
548 | char *human_size_brief(long long bytes) | |
549 | { | |
550 | static char buf[30]; | |
551 | ||
552 | ||
553 | if (bytes < 5000*1024) | |
554 | sprintf(buf, "%ld.%02ldKiB", | |
bd526cee | 555 | (long)(bytes>>10), (long)(((bytes&1023)*100+512)/1024) |
e0d19036 NB |
556 | ); |
557 | else if (bytes < 2*1024LL*1024LL*1024LL) | |
558 | sprintf(buf, "%ld.%02ldMiB", | |
559 | (long)(bytes>>20), | |
bd526cee | 560 | (long)((bytes&0xfffff)+0x100000/200)/(0x100000/100) |
e0d19036 NB |
561 | ); |
562 | else | |
563 | sprintf(buf, "%ld.%02ldGiB", | |
564 | (long)(bytes>>30), | |
bd526cee | 565 | (long)(((bytes>>10)&0xfffff)+0x100000/200)/(0x100000/100) |
e0d19036 NB |
566 | ); |
567 | return buf; | |
568 | } | |
569 | ||
dd0781e5 | 570 | int get_mdp_major(void) |
98c6faba | 571 | { |
dd0781e5 NB |
572 | static int mdp_major = -1; |
573 | FILE *fl; | |
98c6faba NB |
574 | char *w; |
575 | int have_block = 0; | |
576 | int have_devices = 0; | |
577 | int last_num = -1; | |
dd0781e5 NB |
578 | |
579 | if (mdp_major != -1) | |
580 | return mdp_major; | |
581 | fl = fopen("/proc/devices", "r"); | |
98c6faba | 582 | if (!fl) |
dd0781e5 | 583 | return -1; |
98c6faba NB |
584 | while ((w = conf_word(fl, 1))) { |
585 | if (have_block && strcmp(w, "devices:")==0) | |
586 | have_devices = 1; | |
587 | have_block = (strcmp(w, "Block")==0); | |
588 | if (isdigit(w[0])) | |
589 | last_num = atoi(w); | |
590 | if (have_devices && strcmp(w, "mdp")==0) | |
591 | mdp_major = last_num; | |
592 | free(w); | |
593 | } | |
594 | fclose(fl); | |
dd0781e5 | 595 | return mdp_major; |
98c6faba NB |
596 | } |
597 | ||
598 | ||
e0d19036 | 599 | |
e0d19036 NB |
600 | char *get_md_name(int dev) |
601 | { | |
602 | /* find /dev/md%d or /dev/md/%d or make a device /dev/.tmp.md%d */ | |
98c6faba | 603 | /* if dev < 0, want /dev/md/d%d or find mdp in /proc/devices ... */ |
e0d19036 NB |
604 | static char devname[50]; |
605 | struct stat stb; | |
98c6faba | 606 | dev_t rdev; |
dd0781e5 | 607 | char *dn; |
98c6faba NB |
608 | |
609 | if (dev < 0) { | |
dd0781e5 NB |
610 | int mdp = get_mdp_major(); |
611 | if (mdp < 0) return NULL; | |
0df46c2a | 612 | rdev = makedev(mdp, (-1-dev)<<6); |
98c6faba NB |
613 | sprintf(devname, "/dev/md/d%d", -1-dev); |
614 | if (stat(devname, &stb) == 0 | |
615 | && (S_IFMT&stb.st_mode) == S_IFBLK | |
616 | && (stb.st_rdev == rdev)) | |
617 | return devname; | |
618 | } else { | |
0df46c2a | 619 | rdev = makedev(MD_MAJOR, dev); |
98c6faba NB |
620 | sprintf(devname, "/dev/md%d", dev); |
621 | if (stat(devname, &stb) == 0 | |
622 | && (S_IFMT&stb.st_mode) == S_IFBLK | |
623 | && (stb.st_rdev == rdev)) | |
624 | return devname; | |
625 | ||
626 | sprintf(devname, "/dev/md/%d", dev); | |
627 | if (stat(devname, &stb) == 0 | |
628 | && (S_IFMT&stb.st_mode) == S_IFBLK | |
629 | && (stb.st_rdev == rdev)) | |
630 | return devname; | |
631 | } | |
8d80900b | 632 | dn = map_dev(major(rdev), minor(rdev)); |
dd0781e5 NB |
633 | if (dn) |
634 | return dn; | |
e0d19036 NB |
635 | sprintf(devname, "/dev/.tmp.md%d", dev); |
636 | if (mknod(devname, S_IFBLK | 0600, rdev) == -1) | |
dd0781e5 NB |
637 | if (errno != EEXIST) |
638 | return NULL; | |
e0d19036 NB |
639 | |
640 | if (stat(devname, &stb) == 0 | |
641 | && (S_IFMT&stb.st_mode) == S_IFBLK | |
642 | && (stb.st_rdev == rdev)) | |
643 | return devname; | |
644 | unlink(devname); | |
645 | return NULL; | |
646 | } | |
647 | ||
648 | void put_md_name(char *name) | |
649 | { | |
650 | if (strncmp(name, "/dev/.tmp.md", 12)==0) | |
651 | unlink(name); | |
652 | } |