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git.ipfire.org Git - thirdparty/mdadm.git/blob - util.c
d5e2910c60cf242606bd04ad401b4ee125c650d7
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>
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
41 int parse_uuid(char *str
, int uuid
[4])
43 int hit
= 0; /* number of Hex digIT */
46 for (i
=0; i
<4; i
++) uuid
[i
]=0;
52 else if (c
>='a' && c
<= 'f')
54 else if (c
>='A' && c
<= 'F')
56 else if (strchr(":. -", c
))
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
79 * Return version number as 24 but number - assume version parts
83 int md_get_version(int fd
)
88 if (fstat(fd
, &stb
)<0)
90 if ((S_IFMT
&stb
.st_mode
) != S_IFBLK
)
93 if (ioctl(fd
, RAID_VERSION
, &vers
) == 0)
94 return (vers
.major
*10000) + (vers
.minor
*100) + vers
.patchlevel
;
97 if (major(stb
.st_rdev
) == MD_MAJOR
)
103 int get_linux_version()
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);
118 return (a
*1000000)+(b
*1000)+c
;
121 int enough(int level
, int raid_disks
, int avail_disks
)
124 case 10: return 1; /* a lie, but it is hard to tell */
127 return avail_disks
>= 1;
130 return avail_disks
== raid_disks
;
132 return avail_disks
>= 1;
135 return avail_disks
>= raid_disks
-1;
137 return avail_disks
>= raid_disks
-2;
143 int same_uuid(int a
[4], int b
[4])
153 void uuid_from_super(int uuid
[4], mdp_super_t
*super
)
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
;
167 int compare_super(mdp_super_t
*first
, mdp_super_t
*second
)
171 * 0 same, or first was empty, and second was copied
172 * 1 second had wrong number
176 int uuid1
[4], uuid2
[4];
177 if (second
->md_magic
!= MD_SB_MAGIC
)
179 if (first
-> md_magic
!= MD_SB_MAGIC
) {
180 memcpy(first
, second
, sizeof(*first
));
184 uuid_from_super(uuid1
, first
);
185 uuid_from_super(uuid2
, second
);
186 if (!same_uuid(uuid1
, uuid2
))
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
)
201 int load_super(int fd
, mdp_super_t
*super
)
203 /* try to read in the superblock
212 * 6 - wrong major version
215 unsigned long long dsize
;
216 unsigned long long offset
;
219 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
222 if (ioctl(fd
, BLKGETSIZE
, &size
))
228 if (dsize
< MD_RESERVED_SECTORS
*2)
231 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
235 ioctl(fd
, BLKFLSBUF
, 0); /* make sure we read current data */
237 if (lseek64(fd
, offset
, 0)< 0LL)
240 if (read(fd
, super
, sizeof(*super
)) != sizeof(*super
))
243 if (super
->md_magic
!= MD_SB_MAGIC
)
246 if (super
->major_version
!= 0)
251 int store_super(int fd
, mdp_super_t
*super
)
254 unsigned long long dsize
;
259 if (ioctl(fd
, BLKGETSIZE64
, &dsize
) != 0)
262 if (ioctl(fd
, BLKGETSIZE
, &size
))
265 dsize
= ((unsigned long long)size
) << 9;
268 if (dsize
< MD_RESERVED_SECTORS
*2)
271 offset
= MD_NEW_SIZE_SECTORS(dsize
>>9);
275 if (lseek64(fd
, offset
, 0)< 0LL)
278 if (write(fd
, super
, sizeof(*super
)) != sizeof(*super
))
287 int check_ext2(int fd
, char *name
)
290 * Check for an ext2fs file system.
291 * Superblock is always 1K at 1K offset
293 * s_magic is le16 at 56 == 0xEF53
294 * report mtime - le32 at 44
296 * logblksize - le32 at 24
298 unsigned char sb
[1024];
301 if (lseek(fd
, 1024,0)!= 1024)
303 if (read(fd
, sb
, 1024)!= 1024)
305 if (sb
[56] != 0x53 || sb
[57] != 0xef)
308 mtime
= sb
[44]|(sb
[45]|(sb
[46]|sb
[47]<<8)<<8)<<8;
309 bsize
= sb
[24]|(sb
[25]|(sb
[26]|sb
[27]<<8)<<8)<<8;
310 size
= sb
[4]|(sb
[5]|(sb
[6]|sb
[7]<<8)<<8)<<8;
311 fprintf(stderr
, Name
": %s appears to contain an ext2fs file system\n",
313 fprintf(stderr
," size=%dK mtime=%s",
314 size
*(1<<bsize
), ctime(&mtime
));
318 int check_reiser(int fd
, char *name
)
321 * superblock is at 64K
323 * Magic string "ReIsErFs" or "ReIsEr2Fs" at 52
326 unsigned char sb
[1024];
328 if (lseek(fd
, 64*1024, 0) != 64*1024)
330 if (read(fd
, sb
, 1024) != 1024)
332 if (strncmp(sb
+52, "ReIsErFs",8)!=0 &&
333 strncmp(sb
+52, "ReIsEr2Fs",9)!=0)
335 fprintf(stderr
, Name
": %s appears to contain a reiserfs file system\n",name
);
336 size
= sb
[0]|(sb
[1]|(sb
[2]|sb
[3]<<8)<<8)<<8;
337 fprintf(stderr
, " size = %dK\n", size
*4);
342 int check_raid(int fd
, char *name
)
346 if (load_super(fd
, &super
))
348 /* Looks like a raid array .. */
349 fprintf(stderr
, Name
": %s appears to be part of a raid array:\n",
351 crtime
= super
.ctime
;
352 fprintf(stderr
, " level=%d devices=%d ctime=%s",
353 super
.level
, super
.raid_disks
, ctime(&crtime
));
362 for (i
=0; i
<5; i
++) {
364 fprintf(stderr
, "%s%s", mesg
, add
);
366 if (fgets(buf
, 100, stdin
)==NULL
)
368 if (buf
[0]=='y' || buf
[0]=='Y')
370 if (buf
[0]=='n' || buf
[0]=='N')
374 fprintf(stderr
, Name
": assuming 'no'\n");
378 char *map_num(mapping_t
*map
, int num
)
388 int map_name(mapping_t
*map
, char *name
)
391 if (strcmp(map
->name
, name
)==0)
399 int is_standard(char *dev
, int *nump
)
401 /* tests if dev is a "standard" md dev name.
402 * i.e if the last component is "/dNN" or "/mdNN",
403 * where NN is a string of digits
405 char *d
= strrchr(dev
, '/');
410 if (strncmp(d
, "/d",2)==0)
411 d
+= 2, type
=1; /* /dev/md/dN{pM} */
412 else if (strncmp(d
, "/md_d", 5)==0)
413 d
+= 5, type
=1; /* /dev/md_dNpM */
414 else if (strncmp(d
, "/md", 3)==0)
415 d
+= 3, type
=-1; /* /dev/mdN */
416 else if (d
-dev
> 3 && strncmp(d
-2, "md/", 3)==0)
417 type
= -1; /* /dev/md/N */
427 if (nump
) *nump
= num
;
434 * convert a major/minor pair for a block device into a name in /dev, if possible.
435 * On the first call, walk /dev collecting name.
436 * Put them in a simple linked listfor now.
443 int devlist_ready
= 0;
446 char *map_dev(int major
, int minor
)
449 fprintf(stderr
, "Warning - fail to map %d,%d to a device name\n",
455 #define __USE_XOPEN_EXTENDED
460 int add_dev(const char *name
, const struct stat
*stb
, int flag
, struct FTW
*s
)
462 int add_dev(const char *name
, const struct stat
*stb
, int flag
)
465 if ((stb
->st_mode
&S_IFMT
)== S_IFBLK
) {
466 char *n
= strdup(name
);
467 struct devmap
*dm
= malloc(sizeof(*dm
));
469 dm
->major
= major(stb
->st_rdev
);
470 dm
->minor
= minor(stb
->st_rdev
);
480 * Find a block device with the right major/minor number.
481 * Avoid /dev/mdNN and /dev/md/dNN if possible
483 char *map_dev(int major
, int minor
)
487 if (!devlist_ready
) {
489 nftw("/dev", add_dev
, 10, FTW_PHYS
);
491 ftw("/dev", add_dev
, 10);
496 for (p
=devlist
; p
; p
=p
->next
)
497 if (p
->major
== major
&&
499 if (is_standard(p
->name
, NULL
))
509 unsigned long calc_sb_csum(mdp_super_t
*super
)
511 unsigned int oldcsum
= super
->sb_csum
;
512 unsigned long long newcsum
= 0;
515 unsigned int *superc
= (int*) super
;
518 for(i
=0; i
<MD_SB_BYTES
/4; i
++)
520 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
521 super
->sb_csum
= oldcsum
;
525 char *human_size(long long bytes
)
530 if (bytes
< 5000*1024)
532 else if (bytes
< 2*1024LL*1024LL*1024LL)
533 sprintf(buf
, " (%ld.%02ld MiB %ld.%02ld MB)",
535 (long)((bytes
&0xfffff)+0x100000/200)/(0x100000/100),
536 (long)(bytes
/1000/1000),
537 (long)(((bytes
%1000000)+5000)/10000)
540 sprintf(buf
, " (%ld.%02ld GiB %ld.%02ld GB)",
542 (long)(((bytes
>>10)&0xfffff)+0x100000/200)/(0x100000/100),
543 (long)(bytes
/1000LL/1000LL/1000LL),
544 (long)((((bytes
/1000)%1000000)+5000)/10000)
549 char *human_size_brief(long long bytes
)
554 if (bytes
< 5000*1024)
555 sprintf(buf
, "%ld.%02ldKiB",
556 (long)(bytes
>>10), (long)(((bytes
&1023)*100+512)/1024)
558 else if (bytes
< 2*1024LL*1024LL*1024LL)
559 sprintf(buf
, "%ld.%02ldMiB",
561 (long)((bytes
&0xfffff)+0x100000/200)/(0x100000/100)
564 sprintf(buf
, "%ld.%02ldGiB",
566 (long)(((bytes
>>10)&0xfffff)+0x100000/200)/(0x100000/100)
571 int get_mdp_major(void)
573 static int mdp_major
= -1;
577 int have_devices
= 0;
582 fl
= fopen("/proc/devices", "r");
585 while ((w
= conf_word(fl
, 1))) {
586 if (have_block
&& strcmp(w
, "devices:")==0)
588 have_block
= (strcmp(w
, "Block")==0);
591 if (have_devices
&& strcmp(w
, "mdp")==0)
592 mdp_major
= last_num
;
601 char *get_md_name(int dev
)
603 /* find /dev/md%d or /dev/md/%d or make a device /dev/.tmp.md%d */
604 /* if dev < 0, want /dev/md/d%d or find mdp in /proc/devices ... */
605 static char devname
[50];
611 int mdp
= get_mdp_major();
612 if (mdp
< 0) return NULL
;
613 rdev
= makedev(mdp
, (-1-dev
)<<6);
614 sprintf(devname
, "/dev/md/d%d", -1-dev
);
615 if (stat(devname
, &stb
) == 0
616 && (S_IFMT
&stb
.st_mode
) == S_IFBLK
617 && (stb
.st_rdev
== rdev
))
620 rdev
= makedev(MD_MAJOR
, dev
);
621 sprintf(devname
, "/dev/md%d", dev
);
622 if (stat(devname
, &stb
) == 0
623 && (S_IFMT
&stb
.st_mode
) == S_IFBLK
624 && (stb
.st_rdev
== rdev
))
627 sprintf(devname
, "/dev/md/%d", dev
);
628 if (stat(devname
, &stb
) == 0
629 && (S_IFMT
&stb
.st_mode
) == S_IFBLK
630 && (stb
.st_rdev
== rdev
))
633 dn
= map_dev(major(rdev
), minor(rdev
));
636 sprintf(devname
, "/dev/.tmp.md%d", dev
);
637 if (mknod(devname
, S_IFBLK
| 0600, rdev
) == -1)
641 if (stat(devname
, &stb
) == 0
642 && (S_IFMT
&stb
.st_mode
) == S_IFBLK
643 && (stb
.st_rdev
== rdev
))
649 void put_md_name(char *name
)
651 if (strncmp(name
, "/dev/.tmp.md", 12)==0)