]>
git.ipfire.org Git - thirdparty/mdadm.git/blob - util.c
e65d23831fbf5ceb92236b82f513c02f4156340a
2 * mdadm - manage Linux "md" devices aka RAID arrays.
4 * Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
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.
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.
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
22 * Email: <neilb@cse.unsw.edu.au>
24 * School of Computer Science and Engineering
25 * The University of New South Wales
32 #include <sys/utsname.h>
35 * Parse a 128 bit uuid in 4 integers
36 * format is 32 hexx nibbles with options :.<space> separator
37 * If not exactly 32 hex digits are found, return 0
40 int parse_uuid(char *str
, int uuid
[4])
42 int hit
= 0; /* number of Hex digIT */
45 for (i
=0; i
<4; i
++) uuid
[i
]=0;
51 else if (c
>='a' && c
<= 'f')
53 else if (c
>='A' && c
<= 'F')
55 else if (strchr(":. -", c
))
73 * Get the md version number.
74 * We use the RAID_VERSION ioctl if it is supported
75 * If not, but we have a block device with major '9', we assume
78 * Return version number as 24 but number - assume version parts
82 int md_get_version(int fd
)
87 if (fstat(fd
, &stb
)<0)
89 if ((S_IFMT
&stb
.st_mode
) != S_IFBLK
)
92 if (ioctl(fd
, RAID_VERSION
, &vers
) == 0)
93 return (vers
.major
*10000) + (vers
.minor
*100) + vers
.patchlevel
;
96 if (MAJOR(stb
.st_rdev
) == MD_MAJOR
)
102 int get_linux_version()
109 if (sscanf(name
.release
, "%d.%d.%d", &a
,&b
,&c
)!= 3)
111 return (a
*1000000)+(b
*1000)+c
;
114 int enough(int level
, int raid_disks
, int avail_disks
)
118 return avail_disks
>= 1;
121 return avail_disks
== raid_disks
;
123 return avail_disks
>= 1;
126 return avail_disks
>= raid_disks
-1;
132 int same_uuid(int a
[4], int b
[4])
142 void uuid_from_super(int uuid
[4], mdp_super_t
*super
)
144 uuid
[0] = super
->set_uuid0
;
145 if (super
->minor_version
>= 90) {
146 uuid
[1] = super
->set_uuid1
;
147 uuid
[2] = super
->set_uuid2
;
148 uuid
[3] = super
->set_uuid3
;
156 int compare_super(mdp_super_t
*first
, mdp_super_t
*second
)
160 * 0 same, or first was empty, and second was copied
161 * 1 second had wrong number
165 int uuid1
[4], uuid2
[4];
166 if (second
->md_magic
!= MD_SB_MAGIC
)
168 if (first
-> md_magic
!= MD_SB_MAGIC
) {
169 memcpy(first
, second
, sizeof(*first
));
173 uuid_from_super(uuid1
, first
);
174 uuid_from_super(uuid2
, second
);
175 if (!same_uuid(uuid1
, uuid2
))
177 if (first
->major_version
!= second
->major_version
||
178 first
->minor_version
!= second
->minor_version
||
179 first
->patch_version
!= second
->patch_version
||
180 first
->gvalid_words
!= second
->gvalid_words
||
181 first
->ctime
!= second
->ctime
||
182 first
->level
!= second
->level
||
183 first
->size
!= second
->size
||
184 first
->raid_disks
!= second
->raid_disks
)
190 int load_super(int fd
, mdp_super_t
*super
)
192 /* try to read in the superblock
201 * 6 - wrong major version
204 unsigned long long offset
;
206 if (ioctl(fd
, BLKGETSIZE
, &size
))
209 if (size
< MD_RESERVED_SECTORS
*2)
212 offset
= MD_NEW_SIZE_SECTORS(size
);
216 ioctl(fd
, BLKFLSBUF
, 0); /* make sure we read current data */
218 if (lseek64(fd
, offset
, 0)< 0LL)
221 if (read(fd
, super
, sizeof(*super
)) != sizeof(*super
))
224 if (super
->md_magic
!= MD_SB_MAGIC
)
227 if (super
->major_version
!= 0)
232 int store_super(int fd
, mdp_super_t
*super
)
237 if (ioctl(fd
, BLKGETSIZE
, &size
))
240 if (size
< MD_RESERVED_SECTORS
*2)
243 offset
= MD_NEW_SIZE_SECTORS(size
);
247 if (lseek64(fd
, offset
, 0)< 0LL)
250 if (write(fd
, super
, sizeof(*super
)) != sizeof(*super
))
258 int check_ext2(int fd
, char *name
)
261 * Check for an ext2fs file system.
262 * Superblock is always 1K at 1K offset
264 * s_magic is le16 at 56 == 0xEF53
265 * report mtime - le32 at 44
267 * logblksize - le32 at 24
269 unsigned char sb
[1024];
272 if (lseek(fd
, 1024,0)!= 1024)
274 if (read(fd
, sb
, 1024)!= 1024)
276 if (sb
[56] != 0x53 || sb
[57] != 0xef)
279 mtime
= sb
[44]|(sb
[45]|(sb
[46]|sb
[47]<<8)<<8)<<8;
280 bsize
= sb
[24]|(sb
[25]|(sb
[26]|sb
[27]<<8)<<8)<<8;
281 size
= sb
[4]|(sb
[5]|(sb
[6]|sb
[7]<<8)<<8)<<8;
282 fprintf(stderr
, Name
": %s appears to contain an ext2fs file system\n",
284 fprintf(stderr
," size=%dK mtime=%s",
285 size
*(1<<bsize
), ctime(&mtime
));
289 int check_reiser(int fd
, char *name
)
292 * superblock is at 64K
294 * Magic string "ReIsErFs" or "ReIsEr2Fs" at 52
297 unsigned char sb
[1024];
299 if (lseek(fd
, 64*1024, 0) != 64*1024)
301 if (read(fd
, sb
, 1024) != 1024)
303 if (strncmp(sb
+52, "ReIsErFs",8)!=0 &&
304 strncmp(sb
+52, "ReIsEr2Fs",9)!=0)
306 fprintf(stderr
, Name
": %s appears to contain a reiserfs file system\n",name
);
307 size
= sb
[0]|(sb
[1]|(sb
[2]|sb
[3]<<8)<<8)<<8;
308 fprintf(stderr
, " size = %dK\n", size
*4);
313 int check_raid(int fd
, char *name
)
317 if (load_super(fd
, &super
))
319 /* Looks like a raid array .. */
320 fprintf(stderr
, Name
": %s appears to be part of a raid array:\n",
322 crtime
= super
.ctime
;
323 fprintf(stderr
, " level=%d devices=%d ctime=%s",
324 super
.level
, super
.raid_disks
, ctime(&crtime
));
333 for (i
=0; i
<5; i
++) {
335 fprintf(stderr
, "%s%s", mesg
, add
);
337 if (fgets(buf
, 100, stdin
)==NULL
)
339 if (buf
[0]=='y' || buf
[0]=='Y')
341 if (buf
[0]=='n' || buf
[0]=='N')
345 fprintf(stderr
, Name
": assuming 'no'\n");
349 char *map_num(mapping_t
*map
, int num
)
359 int map_name(mapping_t
*map
, char *name
)
362 if (strcmp(map
->name
, name
)==0)
370 * convert a major/minor pair for a block device into a name in /dev, if possible.
371 * On the first call, walk /dev collecting name.
372 * Put them in a simple linked listfor now.
379 int devlist_ready
= 0;
382 char *map_dev(int major
, int minor
)
385 fprintf(stderr
, "Warning - fail to map %d,%d to a device name\n",
391 #define __USE_XOPEN_EXTENDED
395 int add_dev(const char *name
, const struct stat
*stb
, int flag
, struct FTW
*s
)
397 if ((stb
->st_mode
&S_IFMT
)== S_IFBLK
) {
398 char *n
= strdup(name
);
399 struct devmap
*dm
= malloc(sizeof(*dm
));
401 dm
->major
= MAJOR(stb
->st_rdev
);
402 dm
->minor
= MINOR(stb
->st_rdev
);
411 char *map_dev(int major
, int minor
)
414 if (!devlist_ready
) {
415 nftw("/dev", add_dev
, 10, FTW_PHYS
);
419 for (p
=devlist
; p
; p
=p
->next
)
420 if (p
->major
== major
&&
428 int calc_sb_csum(mdp_super_t
*super
)
430 unsigned int oldcsum
= super
->sb_csum
;
431 unsigned long long newcsum
= 0;
434 unsigned int *superc
= (int*) super
;
437 for(i
=0; i
<MD_SB_BYTES
/4; i
++)
439 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
440 super
->sb_csum
= oldcsum
;
444 char *human_size(long long bytes
)
449 if (bytes
< 5000*1024)
451 else if (bytes
< 2*1024LL*1024LL*1024LL)
452 sprintf(buf
, " (%ld.%02ld MiB %ld.%02ld MB)",
454 (long)((bytes
&0xfffff)+0x100000/200)/(0x100000/100),
455 (long)(bytes
/1000/1000),
456 (long)(((bytes
%1000000)+5000)/10000)
459 sprintf(buf
, " (%ld.%02ld GiB %ld.%02ld GB)",
461 (long)(((bytes
>>10)&0xfffff)+0x100000/200)/(0x100000/100),
462 (long)(bytes
/1000LL/1000LL/1000LL),
463 (long)((((bytes
/1000)%1000000)+5000)/10000)
468 char *human_size_brief(long long bytes
)
473 if (bytes
< 5000*1024)
474 sprintf(buf
, "%ld.%02ldKiB",
475 (long)(bytes
>>10), (long)(((bytes
&1023)*100+512)/1024)
477 else if (bytes
< 2*1024LL*1024LL*1024LL)
478 sprintf(buf
, "%ld.%02ldMiB",
480 (long)((bytes
&0xfffff)+0x100000/200)/(0x100000/100)
483 sprintf(buf
, "%ld.%02ldGiB",
485 (long)(((bytes
>>10)&0xfffff)+0x100000/200)/(0x100000/100)
492 char *get_md_name(int dev
)
494 /* find /dev/md%d or /dev/md/%d or make a device /dev/.tmp.md%d */
495 static char devname
[50];
497 dev_t rdev
= MKDEV(MD_MAJOR
, dev
);
499 sprintf(devname
, "/dev/md%d", dev
);
500 if (stat(devname
, &stb
) == 0
501 && (S_IFMT
&stb
.st_mode
) == S_IFBLK
502 && (stb
.st_rdev
== rdev
))
505 sprintf(devname
, "/dev/md/%d", dev
);
506 if (stat(devname
, &stb
) == 0
507 && (S_IFMT
&stb
.st_mode
) == S_IFBLK
508 && (stb
.st_rdev
== rdev
))
511 sprintf(devname
, "/dev/.tmp.md%d", dev
);
512 if (mknod(devname
, S_IFBLK
| 0600, rdev
) == -1)
515 if (stat(devname
, &stb
) == 0
516 && (S_IFMT
&stb
.st_mode
) == S_IFBLK
517 && (stb
.st_rdev
== rdev
))
523 void put_md_name(char *name
)
525 if (strncmp(name
, "/dev/.tmp.md", 12)==0)