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git.ipfire.org Git - thirdparty/mdadm.git/blob - util.c
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
;
95 if (MAJOR(stb
.st_rdev
) == MD_MAJOR
)
101 int get_linux_version()
108 if (sscanf(name
.release
, "%d.%d.%d", &a
,&b
,&c
)!= 3)
110 return (a
*1000000)+(b
*1000)+c
;
113 int enough(int level
, int raid_disks
, int avail_disks
)
118 return avail_disks
== raid_disks
;
120 return avail_disks
>= 1;
123 return avail_disks
>= raid_disks
-1;
129 int same_uuid(int a
[4], int b
[4])
139 void uuid_from_super(int uuid
[4], mdp_super_t
*super
)
141 uuid
[0] = super
->set_uuid0
;
142 if (super
->minor_version
>= 90) {
143 uuid
[1] = super
->set_uuid1
;
144 uuid
[2] = super
->set_uuid2
;
145 uuid
[3] = super
->set_uuid3
;
153 int compare_super(mdp_super_t
*first
, mdp_super_t
*second
)
157 * 0 same, or first was empty, and second was copied
158 * 1 second had wrong number
162 int uuid1
[4], uuid2
[4];
163 if (second
->md_magic
!= MD_SB_MAGIC
)
165 if (first
-> md_magic
!= MD_SB_MAGIC
) {
166 memcpy(first
, second
, sizeof(*first
));
170 uuid_from_super(uuid1
, first
);
171 uuid_from_super(uuid2
, second
);
172 if (!same_uuid(uuid1
, uuid2
))
174 if (first
->major_version
!= second
->major_version
||
175 first
->minor_version
!= second
->minor_version
||
176 first
->patch_version
!= second
->patch_version
||
177 first
->gvalid_words
!= second
->gvalid_words
||
178 first
->ctime
!= second
->ctime
||
179 first
->level
!= second
->level
||
180 first
->size
!= second
->size
||
181 first
->raid_disks
!= second
->raid_disks
)
187 int load_super(int fd
, mdp_super_t
*super
)
189 /* try to read in the superblock
198 * 6 - wrong major version
203 if (ioctl(fd
, BLKGETSIZE
, &size
))
206 if (size
< MD_RESERVED_SECTORS
*2)
209 offset
= MD_NEW_SIZE_SECTORS(size
);
213 if (lseek64(fd
, offset
, 0)< 0LL)
216 if (read(fd
, super
, sizeof(*super
)) != sizeof(*super
))
219 if (super
->md_magic
!= MD_SB_MAGIC
)
222 if (super
->major_version
!= 0)
227 int store_super(int fd
, mdp_super_t
*super
)
232 if (ioctl(fd
, BLKGETSIZE
, &size
))
235 if (size
< MD_RESERVED_SECTORS
*2)
238 offset
= MD_NEW_SIZE_SECTORS(size
);
242 if (lseek64(fd
, offset
, 0)< 0LL)
245 if (write(fd
, super
, sizeof(*super
)) != sizeof(*super
))
253 int check_ext2(int fd
, char *name
)
256 * Check for an ext2fs file system.
257 * Superblock is always 1K at 1K offset
259 * s_magic is le16 at 56 == 0xEF53
260 * report mtime - le32 at 44
262 * logblksize - le32 at 24
264 unsigned char sb
[1024];
267 if (lseek(fd
, 1024,0)!= 1024)
269 if (read(fd
, sb
, 1024)!= 1024)
271 if (sb
[56] != 0x53 || sb
[57] != 0xef)
274 mtime
= sb
[44]|(sb
[45]|(sb
[46]|sb
[47]<<8)<<8)<<8;
275 bsize
= sb
[24]|(sb
[25]|(sb
[26]|sb
[27]<<8)<<8)<<8;
276 size
= sb
[4]|(sb
[5]|(sb
[6]|sb
[7]<<8)<<8)<<8;
277 fprintf(stderr
, Name
": %s appears to contain an ext2fs file system\n",
279 fprintf(stderr
," size=%dK mtime=%s",
280 size
*(1<<bsize
), ctime(&mtime
));
284 int check_reiser(int fd
, char *name
)
287 * superblock is at 64K
289 * Magic string "ReIsErFs" or "ReIsEr2Fs" at 52
292 unsigned char sb
[1024];
294 if (lseek(fd
, 64*1024, 0) != 64*1024)
296 if (read(fd
, sb
, 1024) != 1024)
298 if (strncmp(sb
+52, "ReIsErFs",8)!=0 &&
299 strncmp(sb
+52, "ReIsEr2Fs",9)!=0)
301 fprintf(stderr
, Name
": %s appears to contain a reiserfs file system\n",name
);
302 size
= sb
[0]|(sb
[1]|(sb
[2]|sb
[3]<<8)<<8)<<8;
303 fprintf(stderr
, " size = %dK\n", size
*4);
308 int check_raid(int fd
, char *name
)
312 if (load_super(fd
, &super
))
314 /* Looks like a raid array .. */
315 fprintf(stderr
, Name
": %s appear to be part of a raid array:\n",
317 crtime
= super
.ctime
;
318 fprintf(stderr
, " level=%d disks=%d ctime=%s",
319 super
.level
, super
.raid_disks
, ctime(&crtime
));
328 for (i
=0; i
<5; i
++) {
330 fprintf(stderr
, "%s%s", mesg
, add
);
332 if (fgets(buf
, 100, stdin
)==NULL
)
334 if (buf
[0]=='y' || buf
[0]=='Y')
336 if (buf
[0]=='n' || buf
[0]=='N')
340 fprintf(stderr
, Name
": assuming 'no'\n");
344 char *map_num(mapping_t
*map
, int num
)
354 int map_name(mapping_t
*map
, char *name
)
357 if (strcmp(map
->name
, name
)==0)
365 * convert a major/minor pair for a block device into a name in /dev, if possible.
366 * On the first call, walk /dev collecting name.
367 * Put them in a simple linked listfor now.
374 int devlist_ready
= 0;
376 #define __USE_XOPEN_EXTENDED
380 int add_dev(const char *name
, const struct stat
*stb
, int flag
, struct FTW
*s
)
382 if ((stb
->st_mode
&S_IFMT
)== S_IFBLK
) {
383 char *n
= strdup(name
);
384 struct devmap
*dm
= malloc(sizeof(*dm
));
386 dm
->major
= MAJOR(stb
->st_rdev
);
387 dm
->minor
= MINOR(stb
->st_rdev
);
396 char *map_dev(int major
, int minor
)
399 if (!devlist_ready
) {
400 nftw("/dev", add_dev
, 10, FTW_PHYS
);
404 for (p
=devlist
; p
; p
=p
->next
)
405 if (p
->major
== major
&&
412 int calc_sb_csum(mdp_super_t
*super
)
414 unsigned int oldcsum
= super
->sb_csum
;
415 unsigned long long newcsum
= 0;
418 unsigned int *superc
= (int*) super
;
421 for(i
=0; i
<MD_SB_BYTES
/4; i
++)
423 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
424 super
->sb_csum
= oldcsum
;
428 char *human_size(long long bytes
)
433 if (bytes
< 5000*1024)
435 else if (bytes
< 2*1024LL*1024LL*1024LL)
436 sprintf(buf
, " (%d.%02d MiB %d.%02d MB)",
438 (long)(bytes
&0xfffff)/(0x100000/100),
439 (long)(bytes
/1000/1000),
440 (long)((bytes
%1000000)/10000)
443 sprintf(buf
, " (%d.%02d GiB %d.%02d GB)",
445 (long)((bytes
>>10)&0xfffff)/(0x100000/100),
446 (long)(bytes
/1000LL/1000LL/1000LL),
447 (long)(((bytes
/1000)%1000000)/10000)