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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 | ||
f277ce36 | 143 | int same_uuid(int a[4], int b[4], int swapuuid) |
64c4757e | 144 | { |
f277ce36 NB |
145 | if (swapuuid) { |
146 | /* parse uuids are hostendian. | |
147 | * uuid's from some superblocks are big-ending | |
148 | * if there is a difference, we need to swap.. | |
149 | */ | |
150 | unsigned char *ac = (unsigned char *)a; | |
151 | unsigned char *bc = (unsigned char *)b; | |
152 | int i; | |
153 | for (i=0; i<16; i+= 4) { | |
154 | if (ac[i+0] != bc[i+3] || | |
155 | ac[i+1] != bc[i+2] || | |
156 | ac[i+2] != bc[i+1] || | |
157 | ac[i+3] != bc[i+0]) | |
158 | return 0; | |
159 | } | |
160 | return 1; | |
161 | } else { | |
162 | if (a[0]==b[0] && | |
163 | a[1]==b[1] && | |
164 | a[2]==b[2] && | |
165 | a[3]==b[3]) | |
166 | return 1; | |
167 | return 0; | |
168 | } | |
64c4757e NB |
169 | } |
170 | ||
682c7051 NB |
171 | int check_ext2(int fd, char *name) |
172 | { | |
173 | /* | |
174 | * Check for an ext2fs file system. | |
175 | * Superblock is always 1K at 1K offset | |
176 | * | |
177 | * s_magic is le16 at 56 == 0xEF53 | |
178 | * report mtime - le32 at 44 | |
179 | * blocks - le32 at 4 | |
180 | * logblksize - le32 at 24 | |
181 | */ | |
182 | unsigned char sb[1024]; | |
183 | time_t mtime; | |
184 | int size, bsize; | |
185 | if (lseek(fd, 1024,0)!= 1024) | |
186 | return 0; | |
187 | if (read(fd, sb, 1024)!= 1024) | |
188 | return 0; | |
189 | if (sb[56] != 0x53 || sb[57] != 0xef) | |
190 | return 0; | |
191 | ||
192 | mtime = sb[44]|(sb[45]|(sb[46]|sb[47]<<8)<<8)<<8; | |
193 | bsize = sb[24]|(sb[25]|(sb[26]|sb[27]<<8)<<8)<<8; | |
194 | size = sb[4]|(sb[5]|(sb[6]|sb[7]<<8)<<8)<<8; | |
195 | fprintf(stderr, Name ": %s appears to contain an ext2fs file system\n", | |
196 | name); | |
197 | fprintf(stderr," size=%dK mtime=%s", | |
198 | size*(1<<bsize), ctime(&mtime)); | |
199 | return 1; | |
200 | } | |
201 | ||
202 | int check_reiser(int fd, char *name) | |
203 | { | |
204 | /* | |
205 | * superblock is at 64K | |
206 | * size is 1024; | |
207 | * Magic string "ReIsErFs" or "ReIsEr2Fs" at 52 | |
208 | * | |
209 | */ | |
210 | unsigned char sb[1024]; | |
211 | int size; | |
212 | if (lseek(fd, 64*1024, 0) != 64*1024) | |
213 | return 0; | |
214 | if (read(fd, sb, 1024) != 1024) | |
215 | return 0; | |
a46f4061 NB |
216 | if (strncmp((char*)sb+52, "ReIsErFs",8)!=0 && |
217 | strncmp((char*)sb+52, "ReIsEr2Fs",9)!=0) | |
682c7051 NB |
218 | return 0; |
219 | fprintf(stderr, Name ": %s appears to contain a reiserfs file system\n",name); | |
220 | size = sb[0]|(sb[1]|(sb[2]|sb[3]<<8)<<8)<<8; | |
221 | fprintf(stderr, " size = %dK\n", size*4); | |
222 | ||
223 | return 1; | |
224 | } | |
225 | ||
226 | int check_raid(int fd, char *name) | |
227 | { | |
4b1ac34b NB |
228 | void *super; |
229 | struct mdinfo info; | |
947fd4dd | 230 | struct mddev_ident_s ident; |
682c7051 | 231 | time_t crtime; |
d078d77c | 232 | char *level; |
82d9eba6 | 233 | struct supertype *st = guess_super(fd); |
f9ce90ba | 234 | |
82d9eba6 NB |
235 | if (!st) return 0; |
236 | st->ss->load_super(st, fd, &super, name); | |
237 | /* Looks like a raid array .. */ | |
238 | fprintf(stderr, Name ": %s appears to be part of a raid array:\n", | |
239 | name); | |
947fd4dd | 240 | st->ss->getinfo_super(&info, &ident, super); |
82d9eba6 NB |
241 | free(super); |
242 | crtime = info.array.ctime; | |
d078d77c NB |
243 | level = map_num(pers, info.array.level); |
244 | if (!level) level = "-unknown-"; | |
245 | fprintf(stderr, " level=%s devices=%d ctime=%s", | |
246 | level, info.array.raid_disks, ctime(&crtime)); | |
82d9eba6 | 247 | return 1; |
682c7051 NB |
248 | } |
249 | ||
682c7051 NB |
250 | int ask(char *mesg) |
251 | { | |
252 | char *add = ""; | |
253 | int i; | |
254 | for (i=0; i<5; i++) { | |
255 | char buf[100]; | |
256 | fprintf(stderr, "%s%s", mesg, add); | |
257 | fflush(stderr); | |
258 | if (fgets(buf, 100, stdin)==NULL) | |
259 | return 0; | |
260 | if (buf[0]=='y' || buf[0]=='Y') | |
261 | return 1; | |
262 | if (buf[0]=='n' || buf[0]=='N') | |
263 | return 0; | |
264 | add = "(y/n) "; | |
265 | } | |
266 | fprintf(stderr, Name ": assuming 'no'\n"); | |
267 | return 0; | |
268 | } | |
269 | ||
270 | char *map_num(mapping_t *map, int num) | |
271 | { | |
272 | while (map->name) { | |
273 | if (map->num == num) | |
274 | return map->name; | |
275 | map++; | |
276 | } | |
277 | return NULL; | |
278 | } | |
279 | ||
280 | int map_name(mapping_t *map, char *name) | |
281 | { | |
282 | while (map->name) { | |
283 | if (strcmp(map->name, name)==0) | |
284 | return map->num; | |
285 | map++; | |
286 | } | |
98c6faba | 287 | return UnSet; |
682c7051 | 288 | } |
82b27616 | 289 | |
e5329c37 | 290 | |
8d80900b | 291 | int is_standard(char *dev, int *nump) |
e5329c37 NB |
292 | { |
293 | /* tests if dev is a "standard" md dev name. | |
294 | * i.e if the last component is "/dNN" or "/mdNN", | |
295 | * where NN is a string of digits | |
296 | */ | |
8d80900b NB |
297 | char *d = strrchr(dev, '/'); |
298 | int type=0; | |
299 | int num; | |
300 | if (!d) | |
e5329c37 | 301 | return 0; |
8d80900b NB |
302 | if (strncmp(d, "/d",2)==0) |
303 | d += 2, type=1; /* /dev/md/dN{pM} */ | |
304 | else if (strncmp(d, "/md_d", 5)==0) | |
305 | d += 5, type=1; /* /dev/md_dNpM */ | |
306 | else if (strncmp(d, "/md", 3)==0) | |
307 | d += 3, type=-1; /* /dev/mdN */ | |
308 | else if (d-dev > 3 && strncmp(d-2, "md/", 3)==0) | |
5a6d1148 | 309 | d += 1, type=-1; /* /dev/md/N */ |
e5329c37 NB |
310 | else |
311 | return 0; | |
8d80900b | 312 | if (!*d) |
e5329c37 | 313 | return 0; |
8d80900b NB |
314 | num = atoi(d); |
315 | while (isdigit(*d)) | |
316 | d++; | |
317 | if (*d) | |
e5329c37 | 318 | return 0; |
8d80900b NB |
319 | if (nump) *nump = num; |
320 | ||
321 | return type; | |
e5329c37 NB |
322 | } |
323 | ||
324 | ||
82b27616 NB |
325 | /* |
326 | * convert a major/minor pair for a block device into a name in /dev, if possible. | |
327 | * On the first call, walk /dev collecting name. | |
328 | * Put them in a simple linked listfor now. | |
329 | */ | |
330 | struct devmap { | |
331 | int major, minor; | |
332 | char *name; | |
333 | struct devmap *next; | |
334 | } *devlist = NULL; | |
335 | int devlist_ready = 0; | |
336 | ||
5787fa49 | 337 | #ifdef UCLIBC |
173fc515 NB |
338 | int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s) |
339 | { | |
340 | } | |
5787fa49 NB |
341 | char *map_dev(int major, int minor) |
342 | { | |
343 | #if 0 | |
344 | fprintf(stderr, "Warning - fail to map %d,%d to a device name\n", | |
345 | major, minor); | |
346 | #endif | |
347 | return NULL; | |
348 | } | |
349 | #else | |
82b27616 | 350 | |
173fc515 NB |
351 | #ifdef __dietlibc__ |
352 | int add_dev_1(const char *name, const struct stat *stb, int flag) | |
353 | { | |
354 | return add_dev(name, stb, flag, NULL); | |
355 | } | |
356 | int nftw(const char *path, int (*han)(const char *name, const struct stat *stb, int flag, struct FTW *s), int nopenfd, int flags) | |
357 | { | |
358 | ftw(path, add_dev_1, nopenfd); | |
359 | } | |
360 | #endif | |
82b27616 NB |
361 | |
362 | int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s) | |
363 | { | |
364 | if ((stb->st_mode&S_IFMT)== S_IFBLK) { | |
365 | char *n = strdup(name); | |
366 | struct devmap *dm = malloc(sizeof(*dm)); | |
367 | if (dm) { | |
0df46c2a NB |
368 | dm->major = major(stb->st_rdev); |
369 | dm->minor = minor(stb->st_rdev); | |
82b27616 NB |
370 | dm->name = n; |
371 | dm->next = devlist; | |
372 | devlist = dm; | |
373 | } | |
374 | } | |
375 | return 0; | |
376 | } | |
377 | ||
dd0781e5 NB |
378 | /* |
379 | * Find a block device with the right major/minor number. | |
b79713f8 NB |
380 | * If we find multiple names, choose the shortest. |
381 | * If we find a non-standard name, it is probably there | |
382 | * deliberately so prefer it over a standard name. | |
383 | * This applies only to names for MD devices. | |
dd0781e5 | 384 | */ |
82b27616 NB |
385 | char *map_dev(int major, int minor) |
386 | { | |
dd0781e5 | 387 | struct devmap *p; |
b79713f8 | 388 | char *std = NULL, *nonstd=NULL; |
dd0781e5 | 389 | if (!devlist_ready) { |
dd0781e5 | 390 | nftw("/dev", add_dev, 10, FTW_PHYS); |
dd0781e5 NB |
391 | devlist_ready=1; |
392 | } | |
82b27616 | 393 | |
dd0781e5 NB |
394 | for (p=devlist; p; p=p->next) |
395 | if (p->major == major && | |
396 | p->minor == minor) { | |
b79713f8 NB |
397 | if (is_standard(p->name, NULL)) { |
398 | if (std == NULL || | |
399 | strlen(p->name) < strlen(std)) | |
400 | std = p->name; | |
401 | } else { | |
402 | if (nonstd == NULL || | |
403 | strlen(p->name) < strlen(nonstd)) | |
404 | nonstd = p->name; | |
405 | } | |
dd0781e5 | 406 | } |
b79713f8 | 407 | return nonstd ? nonstd : std; |
82b27616 NB |
408 | } |
409 | ||
5787fa49 | 410 | #endif |
82b27616 | 411 | |
4b1ac34b | 412 | unsigned long calc_csum(void *super, int bytes) |
82b27616 | 413 | { |
56eb10c0 | 414 | unsigned long long newcsum = 0; |
82b27616 | 415 | int i; |
4b1ac34b NB |
416 | unsigned int csum; |
417 | unsigned int *superc = (unsigned int*) super; | |
82b27616 | 418 | |
4b1ac34b | 419 | for(i=0; i<bytes/4; i++) |
82b27616 NB |
420 | newcsum+= superc[i]; |
421 | csum = (newcsum& 0xffffffff) + (newcsum>>32); | |
570c0542 NB |
422 | #ifdef __alpha__ |
423 | /* The in-kernel checksum calculation is always 16bit on | |
424 | * the alpha, though it is 32 bit on i386... | |
425 | * I wonder what it is elsewhere... (it uses and API in | |
426 | * a way that it shouldn't). | |
427 | */ | |
428 | csum = (csum & 0xffff) + (csum >> 16); | |
429 | csum = (csum & 0xffff) + (csum >> 16); | |
430 | #endif | |
82b27616 NB |
431 | return csum; |
432 | } | |
cd29a5c8 | 433 | |
56eb10c0 | 434 | char *human_size(long long bytes) |
cd29a5c8 NB |
435 | { |
436 | static char buf[30]; | |
d5d3721e NB |
437 | |
438 | /* We convert bytes to either centi-M{ega,ibi}bytes or | |
439 | * centi-G{igi,ibi}bytes, with appropriate rounding, | |
440 | * and then print 1/100th of those as a decimal. | |
441 | * We allow upto 2048Megabytes before converting to | |
442 | * gigabytes, as that shows more precision and isn't | |
443 | * too large a number. | |
444 | * Terrabytes are not yet handled. | |
445 | */ | |
cd29a5c8 | 446 | |
56eb10c0 | 447 | if (bytes < 5000*1024) |
cd29a5c8 | 448 | buf[0]=0; |
d5d3721e NB |
449 | else if (bytes < 2*1024LL*1024LL*1024LL) { |
450 | long cMiB = (bytes / ( (1LL<<20) / 200LL ) +1) /2; | |
451 | long cMB = (bytes / ( 1000000LL / 200LL ) +1) /2; | |
8f23b0b3 | 452 | snprintf(buf, sizeof(buf), " (%ld.%02ld MiB %ld.%02ld MB)", |
d5d3721e NB |
453 | cMiB/100 , cMiB % 100, |
454 | cMB/100, cMB % 100); | |
455 | } else { | |
456 | long cGiB = (bytes / ( (1LL<<30) / 200LL ) +1) /2; | |
457 | long cGB = (bytes / (1000000000LL/200LL ) +1) /2; | |
8f23b0b3 | 458 | snprintf(buf, sizeof(buf), " (%ld.%02ld GiB %ld.%02ld GB)", |
d5d3721e NB |
459 | cGiB/100 , cGiB % 100, |
460 | cGB/100, cGB % 100); | |
461 | } | |
cd29a5c8 NB |
462 | return buf; |
463 | } | |
e0d19036 NB |
464 | |
465 | char *human_size_brief(long long bytes) | |
466 | { | |
467 | static char buf[30]; | |
468 | ||
469 | ||
470 | if (bytes < 5000*1024) | |
8f23b0b3 | 471 | snprintf(buf, sizeof(buf), "%ld.%02ldKiB", |
bd526cee | 472 | (long)(bytes>>10), (long)(((bytes&1023)*100+512)/1024) |
e0d19036 NB |
473 | ); |
474 | else if (bytes < 2*1024LL*1024LL*1024LL) | |
8f23b0b3 | 475 | snprintf(buf, sizeof(buf), "%ld.%02ldMiB", |
e0d19036 | 476 | (long)(bytes>>20), |
bd526cee | 477 | (long)((bytes&0xfffff)+0x100000/200)/(0x100000/100) |
e0d19036 NB |
478 | ); |
479 | else | |
8f23b0b3 | 480 | snprintf(buf, sizeof(buf), "%ld.%02ldGiB", |
e0d19036 | 481 | (long)(bytes>>30), |
bd526cee | 482 | (long)(((bytes>>10)&0xfffff)+0x100000/200)/(0x100000/100) |
e0d19036 NB |
483 | ); |
484 | return buf; | |
485 | } | |
486 | ||
dd0781e5 | 487 | int get_mdp_major(void) |
98c6faba | 488 | { |
dd0781e5 NB |
489 | static int mdp_major = -1; |
490 | FILE *fl; | |
98c6faba NB |
491 | char *w; |
492 | int have_block = 0; | |
493 | int have_devices = 0; | |
494 | int last_num = -1; | |
dd0781e5 NB |
495 | |
496 | if (mdp_major != -1) | |
497 | return mdp_major; | |
498 | fl = fopen("/proc/devices", "r"); | |
98c6faba | 499 | if (!fl) |
dd0781e5 | 500 | return -1; |
98c6faba NB |
501 | while ((w = conf_word(fl, 1))) { |
502 | if (have_block && strcmp(w, "devices:")==0) | |
503 | have_devices = 1; | |
504 | have_block = (strcmp(w, "Block")==0); | |
505 | if (isdigit(w[0])) | |
506 | last_num = atoi(w); | |
507 | if (have_devices && strcmp(w, "mdp")==0) | |
508 | mdp_major = last_num; | |
509 | free(w); | |
510 | } | |
511 | fclose(fl); | |
dd0781e5 | 512 | return mdp_major; |
98c6faba NB |
513 | } |
514 | ||
515 | ||
e0d19036 | 516 | |
e0d19036 NB |
517 | char *get_md_name(int dev) |
518 | { | |
519 | /* find /dev/md%d or /dev/md/%d or make a device /dev/.tmp.md%d */ | |
98c6faba | 520 | /* if dev < 0, want /dev/md/d%d or find mdp in /proc/devices ... */ |
e0d19036 NB |
521 | static char devname[50]; |
522 | struct stat stb; | |
98c6faba | 523 | dev_t rdev; |
dd0781e5 | 524 | char *dn; |
98c6faba NB |
525 | |
526 | if (dev < 0) { | |
dd0781e5 NB |
527 | int mdp = get_mdp_major(); |
528 | if (mdp < 0) return NULL; | |
0df46c2a | 529 | rdev = makedev(mdp, (-1-dev)<<6); |
8f23b0b3 | 530 | snprintf(devname, sizeof(devname), "/dev/md/d%d", -1-dev); |
98c6faba NB |
531 | if (stat(devname, &stb) == 0 |
532 | && (S_IFMT&stb.st_mode) == S_IFBLK | |
533 | && (stb.st_rdev == rdev)) | |
534 | return devname; | |
535 | } else { | |
0df46c2a | 536 | rdev = makedev(MD_MAJOR, dev); |
8f23b0b3 | 537 | snprintf(devname, sizeof(devname), "/dev/md%d", dev); |
98c6faba NB |
538 | if (stat(devname, &stb) == 0 |
539 | && (S_IFMT&stb.st_mode) == S_IFBLK | |
540 | && (stb.st_rdev == rdev)) | |
541 | return devname; | |
542 | ||
8f23b0b3 | 543 | snprintf(devname, sizeof(devname), "/dev/md/%d", dev); |
98c6faba NB |
544 | if (stat(devname, &stb) == 0 |
545 | && (S_IFMT&stb.st_mode) == S_IFBLK | |
546 | && (stb.st_rdev == rdev)) | |
547 | return devname; | |
548 | } | |
8d80900b | 549 | dn = map_dev(major(rdev), minor(rdev)); |
dd0781e5 NB |
550 | if (dn) |
551 | return dn; | |
8f23b0b3 | 552 | snprintf(devname, sizeof(devname), "/dev/.tmp.md%d", dev); |
e0d19036 | 553 | if (mknod(devname, S_IFBLK | 0600, rdev) == -1) |
dd0781e5 NB |
554 | if (errno != EEXIST) |
555 | return NULL; | |
e0d19036 NB |
556 | |
557 | if (stat(devname, &stb) == 0 | |
558 | && (S_IFMT&stb.st_mode) == S_IFBLK | |
559 | && (stb.st_rdev == rdev)) | |
560 | return devname; | |
561 | unlink(devname); | |
562 | return NULL; | |
563 | } | |
564 | ||
565 | void put_md_name(char *name) | |
566 | { | |
567 | if (strncmp(name, "/dev/.tmp.md", 12)==0) | |
568 | unlink(name); | |
569 | } | |
f9ce90ba NB |
570 | |
571 | ||
572 | ||
82d9eba6 | 573 | struct superswitch *superlist[] = { &super0, &super1, NULL }; |
f9ce90ba | 574 | |
82d9eba6 | 575 | struct supertype *super_by_version(int vers, int minor) |
f9ce90ba | 576 | { |
82d9eba6 NB |
577 | struct supertype *st = malloc(sizeof(*st)); |
578 | if (!st) return st; | |
6fbba4c9 | 579 | if (vers == 0) { |
82d9eba6 | 580 | st->ss = &super0; |
6fbba4c9 NB |
581 | st->max_devs = MD_SB_DISKS; |
582 | } | |
82d9eba6 | 583 | |
6fbba4c9 | 584 | if (vers == 1) { |
82d9eba6 | 585 | st->ss = &super1; |
6fbba4c9 NB |
586 | st->max_devs = 384; |
587 | } | |
82d9eba6 NB |
588 | st->minor_version = minor; |
589 | return st; | |
f9ce90ba NB |
590 | } |
591 | ||
82d9eba6 | 592 | struct supertype *guess_super(int fd) |
f9ce90ba NB |
593 | { |
594 | /* try each load_super to find the best match, | |
595 | * and return the best superswitch | |
596 | */ | |
82d9eba6 NB |
597 | struct superswitch *ss; |
598 | struct supertype *st; | |
570c0542 NB |
599 | unsigned long besttime = 0; |
600 | int bestsuper = -1; | |
82d9eba6 | 601 | |
f9ce90ba NB |
602 | void *sbp = NULL; |
603 | int i; | |
604 | ||
82d9eba6 NB |
605 | st = malloc(sizeof(*st)); |
606 | memset(st, 0, sizeof(*st)); | |
f9ce90ba NB |
607 | for (i=0 ; superlist[i]; i++) { |
608 | int rv; | |
609 | ss = superlist[i]; | |
f277ce36 | 610 | st->ss = NULL; |
82d9eba6 | 611 | rv = ss->load_super(st, fd, &sbp, NULL); |
570c0542 NB |
612 | if (rv == 0) { |
613 | struct mdinfo info; | |
947fd4dd NB |
614 | struct mddev_ident_s ident; |
615 | ss->getinfo_super(&info, &ident, sbp); | |
570c0542 NB |
616 | if (bestsuper == -1 || |
617 | besttime < info.array.ctime) { | |
618 | bestsuper = i; | |
619 | besttime = info.array.ctime; | |
570c0542 NB |
620 | } |
621 | free(sbp); | |
622 | } | |
623 | } | |
624 | if (bestsuper != -1) { | |
625 | int rv; | |
f277ce36 | 626 | st->ss = NULL; |
570c0542 | 627 | rv = superlist[bestsuper]->load_super(st, fd, &sbp, NULL); |
f9ce90ba NB |
628 | if (rv == 0) { |
629 | free(sbp); | |
82d9eba6 | 630 | return st; |
f9ce90ba NB |
631 | } |
632 | } | |
570c0542 | 633 | free(st); |
f9ce90ba NB |
634 | return NULL; |
635 | } | |
fe6729fa NB |
636 | |
637 | #ifdef __TINYC__ | |
638 | /* tinyc doesn't optimize this check in ioctl.h out ... */ | |
639 | unsigned int __invalid_size_argument_for_IOC = 0; | |
640 | #endif | |
641 |