2 * mdadm - manage Linux "md" devices aka RAID arrays.
4 * Copyright (C) 2001-2012 Neil Brown <neilb@suse.de>
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@suse.de>
27 #include <sys/socket.h>
28 #include <sys/utsname.h>
31 #include <sys/resource.h>
37 * following taken from linux/blkpg.h because they aren't
38 * anywhere else and it isn't safe to #include linux/ * stuff.
41 #define BLKPG _IO(0x12,105)
43 /* The argument structure */
44 struct blkpg_ioctl_arg
{
51 /* The subfunctions (for the op field) */
52 #define BLKPG_ADD_PARTITION 1
53 #define BLKPG_DEL_PARTITION 2
55 /* Sizes of name fields. Unused at present. */
56 #define BLKPG_DEVNAMELTH 64
57 #define BLKPG_VOLNAMELTH 64
59 /* The data structure for ADD_PARTITION and DEL_PARTITION */
60 struct blkpg_partition
{
61 long long start
; /* starting offset in bytes */
62 long long length
; /* length in bytes */
63 int pno
; /* partition number */
64 char devname
[BLKPG_DEVNAMELTH
]; /* partition name, like sda5 or c0d1p2,
65 to be used in kernel messages */
66 char volname
[BLKPG_VOLNAMELTH
]; /* volume label */
71 /* Force a compilation error if condition is true */
72 #define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition))
74 /* Force a compilation error if condition is true, but also produce a
75 result (of value 0 and type size_t), so the expression can be used
76 e.g. in a structure initializer (or where-ever else comma expressions
78 #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
81 * Parse a 128 bit uuid in 4 integers
82 * format is 32 hexx nibbles with options :.<space> separator
83 * If not exactly 32 hex digits are found, return 0
86 int parse_uuid(char *str
, int uuid
[4])
88 int hit
= 0; /* number of Hex digIT */
91 for (i
= 0; i
< 4; i
++)
94 while ((c
= *str
++) != 0) {
96 if (c
>= '0' && c
<= '9')
98 else if (c
>= 'a' && c
<= 'f')
100 else if (c
>= 'A' && c
<= 'F')
102 else if (strchr(":. -", c
))
118 * Get the md version number.
119 * We use the RAID_VERSION ioctl if it is supported
120 * If not, but we have a block device with major '9', we assume
123 * Return version number as 24 but number - assume version parts
127 int md_get_version(int fd
)
132 if (fstat(fd
, &stb
)<0)
134 if ((S_IFMT
&stb
.st_mode
) != S_IFBLK
)
137 if (ioctl(fd
, RAID_VERSION
, &vers
) == 0)
138 return (vers
.major
*10000) + (vers
.minor
*100) + vers
.patchlevel
;
141 if (major(stb
.st_rdev
) == MD_MAJOR
)
146 int get_linux_version()
150 int a
= 0, b
= 0,c
= 0;
155 a
= strtoul(cp
, &cp
, 10);
157 b
= strtoul(cp
+1, &cp
, 10);
159 c
= strtoul(cp
+1, &cp
, 10);
161 return (a
*1000000)+(b
*1000)+c
;
165 int mdadm_version(char *version
)
173 cp
= strchr(version
, '-');
174 if (!cp
|| *(cp
+1) != ' ' || *(cp
+2) != 'v')
177 a
= strtoul(cp
, &cp
, 10);
180 b
= strtoul(cp
+1, &cp
, 10);
182 c
= strtoul(cp
+1, &cp
, 10);
185 if (*cp
!= ' ' && *cp
!= '-')
187 return (a
*1000000)+(b
*1000)+c
;
190 unsigned long long parse_size(char *size
)
192 /* parse 'size' which should be a number optionally
193 * followed by 'K', 'M', or 'G'.
194 * Without a suffix, K is assumed.
195 * Number returned is in sectors (half-K)
196 * INVALID_SECTORS returned on error.
199 long long s
= strtoll(size
, &c
, 10);
213 s
*= 1024 * 1024 * 2;
215 case 's': /* sectors */
226 int parse_layout_10(char *layout
)
230 /* Parse the layout string for raid10 */
231 /* 'f', 'o' or 'n' followed by a number <= raid_disks */
232 if ((layout
[0] != 'n' && layout
[0] != 'f' && layout
[0] != 'o') ||
233 (copies
= strtoul(layout
+1, &cp
, 10)) < 1 ||
237 if (layout
[0] == 'n')
239 else if (layout
[0] == 'o')
240 rv
= 0x10000 + (copies
<<8) + 1;
242 rv
= 1 + (copies
<<8);
246 int parse_layout_faulty(char *layout
)
248 /* Parse the layout string for 'faulty' */
249 int ln
= strcspn(layout
, "0123456789");
250 char *m
= xstrdup(layout
);
253 mode
= map_name(faultylayout
, m
);
257 return mode
| (atoi(layout
+ln
)<< ModeShift
);
260 long parse_num(char *num
)
262 /* Either return a valid number, or -1 */
264 long rv
= strtol(num
, &c
, 10);
265 if (rv
< 0 || *c
|| !num
[0])
272 void remove_partitions(int fd
)
274 /* remove partitions from this block devices.
275 * This is used for components added to an array
277 #ifdef BLKPG_DEL_PARTITION
278 struct blkpg_ioctl_arg a
;
279 struct blkpg_partition p
;
281 a
.op
= BLKPG_DEL_PARTITION
;
283 a
.datalen
= sizeof(p
);
285 memset(a
.data
, 0, a
.datalen
);
286 for (p
.pno
= 0; p
.pno
< 16; p
.pno
++)
287 ioctl(fd
, BLKPG
, &a
);
291 int test_partition(int fd
)
293 /* Check if fd is a whole-disk or a partition.
294 * BLKPG will return EINVAL on a partition, and BLKPG_DEL_PARTITION
295 * will return ENXIO on an invalid partition number.
297 struct blkpg_ioctl_arg a
;
298 struct blkpg_partition p
;
299 a
.op
= BLKPG_DEL_PARTITION
;
301 a
.datalen
= sizeof(p
);
303 memset(a
.data
, 0, a
.datalen
);
305 if (ioctl(fd
, BLKPG
, &a
) == 0)
306 /* Very unlikely, but not a partition */
309 /* not a partition */
315 int test_partition_from_id(dev_t id
)
320 sprintf(buf
, "%d:%d", major(id
), minor(id
));
321 fd
= dev_open(buf
, O_RDONLY
);
324 rv
= test_partition(fd
);
329 int enough(int level
, int raid_disks
, int layout
, int clean
, char *avail
)
335 for (i
= 0; i
< raid_disks
; i
++)
336 avail_disks
+= !!avail
[i
];
340 /* This is the tricky one - we need to check
341 * which actual disks are present.
343 copies
= (layout
&255)* ((layout
>>8) & 255);
346 /* there must be one of the 'copies' form 'first' */
353 this = (this+1) % raid_disks
;
357 first
= (first
+(layout
&255)) % raid_disks
;
358 } while (first
!= 0);
361 case LEVEL_MULTIPATH
:
362 return avail_disks
>= 1;
365 return avail_disks
== raid_disks
;
367 return avail_disks
>= 1;
371 return avail_disks
>= raid_disks
-1;
373 return avail_disks
>= raid_disks
;
376 return avail_disks
>= raid_disks
-2;
378 return avail_disks
>= raid_disks
;
384 int enough_fd(int fd
)
386 struct mdu_array_info_s array
;
387 struct mdu_disk_info_s disk
;
392 if (ioctl(fd
, GET_ARRAY_INFO
, &array
) != 0 ||
393 array
.raid_disks
<= 0)
395 avail
= xcalloc(array
.raid_disks
, 1);
396 for (i
= 0; i
< MAX_DISKS
&& array
.nr_disks
> 0; i
++) {
398 if (ioctl(fd
, GET_DISK_INFO
, &disk
) != 0)
400 if (disk
.major
== 0 && disk
.minor
== 0)
404 if (! (disk
.state
& (1<<MD_DISK_SYNC
)))
406 if (disk
.raid_disk
< 0 || disk
.raid_disk
>= array
.raid_disks
)
409 avail
[disk
.raid_disk
] = 1;
411 /* This is used on an active array, so assume it is clean */
412 rv
= enough(array
.level
, array
.raid_disks
, array
.layout
,
418 const int uuid_zero
[4] = { 0, 0, 0, 0 };
420 int same_uuid(int a
[4], int b
[4], int swapuuid
)
423 /* parse uuids are hostendian.
424 * uuid's from some superblocks are big-ending
425 * if there is a difference, we need to swap..
427 unsigned char *ac
= (unsigned char *)a
;
428 unsigned char *bc
= (unsigned char *)b
;
430 for (i
= 0; i
< 16; i
+= 4) {
431 if (ac
[i
+0] != bc
[i
+3] ||
432 ac
[i
+1] != bc
[i
+2] ||
433 ac
[i
+2] != bc
[i
+1] ||
448 void copy_uuid(void *a
, int b
[4], int swapuuid
)
451 /* parse uuids are hostendian.
452 * uuid's from some superblocks are big-ending
453 * if there is a difference, we need to swap..
455 unsigned char *ac
= (unsigned char *)a
;
456 unsigned char *bc
= (unsigned char *)b
;
458 for (i
= 0; i
< 16; i
+= 4) {
468 char *__fname_from_uuid(int id
[4], int swap
, char *buf
, char sep
)
475 copy_uuid(uuid
, id
, swap
);
476 for (i
= 0; i
< 4; i
++) {
479 for (j
= 3; j
>= 0; j
--) {
480 sprintf(c
,"%02x", (unsigned char) uuid
[j
+4*i
]);
488 char *fname_from_uuid(struct supertype
*st
, struct mdinfo
*info
, char *buf
, char sep
)
490 // dirty hack to work around an issue with super1 superblocks...
491 // super1 superblocks need swapuuid set in order for assembly to
492 // work, but can't have it set if we want this printout to match
493 // all the other uuid printouts in super1.c, so we force swapuuid
494 // to 1 to make our printout match the rest of super1
495 return __fname_from_uuid(info
->uuid
, (st
->ss
== &super1
) ? 1 : st
->ss
->swapuuid
, buf
, sep
);
499 int check_ext2(int fd
, char *name
)
502 * Check for an ext2fs file system.
503 * Superblock is always 1K at 1K offset
505 * s_magic is le16 at 56 == 0xEF53
506 * report mtime - le32 at 44
508 * logblksize - le32 at 24
510 unsigned char sb
[1024];
513 if (lseek(fd
, 1024,0)!= 1024)
515 if (read(fd
, sb
, 1024)!= 1024)
517 if (sb
[56] != 0x53 || sb
[57] != 0xef)
520 mtime
= sb
[44]|(sb
[45]|(sb
[46]|sb
[47]<<8)<<8)<<8;
521 bsize
= sb
[24]|(sb
[25]|(sb
[26]|sb
[27]<<8)<<8)<<8;
522 size
= sb
[4]|(sb
[5]|(sb
[6]|sb
[7]<<8)<<8)<<8;
523 pr_err("%s appears to contain an ext2fs file system\n",
525 cont_err("size=%dK mtime=%s",
526 size
*(1<<bsize
), ctime(&mtime
));
530 int check_reiser(int fd
, char *name
)
533 * superblock is at 64K
535 * Magic string "ReIsErFs" or "ReIsEr2Fs" at 52
538 unsigned char sb
[1024];
540 if (lseek(fd
, 64*1024, 0) != 64*1024)
542 if (read(fd
, sb
, 1024) != 1024)
544 if (strncmp((char*)sb
+52, "ReIsErFs",8) != 0 &&
545 strncmp((char*)sb
+52, "ReIsEr2Fs",9) != 0)
547 pr_err("%s appears to contain a reiserfs file system\n",name
);
548 size
= sb
[0]|(sb
[1]|(sb
[2]|sb
[3]<<8)<<8)<<8;
549 cont_err("size = %luK\n", size
*4);
554 int check_raid(int fd
, char *name
)
559 struct supertype
*st
= guess_super(fd
);
563 st
->ss
->load_super(st
, fd
, name
);
564 /* Looks like a raid array .. */
565 pr_err("%s appears to be part of a raid array:\n",
567 st
->ss
->getinfo_super(st
, &info
, NULL
);
568 st
->ss
->free_super(st
);
569 crtime
= info
.array
.ctime
;
570 level
= map_num(pers
, info
.array
.level
);
571 if (!level
) level
= "-unknown-";
572 cont_err("level=%s devices=%d ctime=%s",
573 level
, info
.array
.raid_disks
, ctime(&crtime
));
581 for (i
= 0; i
< 5; i
++) {
583 fprintf(stderr
, "%s%s", mesg
, add
);
585 if (fgets(buf
, 100, stdin
)==NULL
)
587 if (buf
[0]=='y' || buf
[0]=='Y')
589 if (buf
[0]=='n' || buf
[0]=='N')
593 pr_err("assuming 'no'\n");
596 #endif /* MDASSEMBLE */
598 int is_standard(char *dev
, int *nump
)
600 /* tests if dev is a "standard" md dev name.
601 * i.e if the last component is "/dNN" or "/mdNN",
602 * where NN is a string of digits
603 * Returns 1 if a partitionable standard,
604 * -1 if non-partitonable,
605 * 0 if not a standard name.
607 char *d
= strrchr(dev
, '/');
612 if (strncmp(d
, "/d",2) == 0)
613 d
+= 2, type
= 1; /* /dev/md/dN{pM} */
614 else if (strncmp(d
, "/md_d", 5) == 0)
615 d
+= 5, type
= 1; /* /dev/md_dN{pM} */
616 else if (strncmp(d
, "/md", 3) == 0)
617 d
+= 3, type
= -1; /* /dev/mdN */
618 else if (d
-dev
> 3 && strncmp(d
-2, "md/", 3) == 0)
619 d
+= 1, type
= -1; /* /dev/md/N */
629 if (nump
) *nump
= num
;
634 unsigned long calc_csum(void *super
, int bytes
)
636 unsigned long long newcsum
= 0;
639 unsigned int *superc
= (unsigned int*) super
;
641 for(i
= 0; i
< bytes
/4; i
++)
642 newcsum
+= superc
[i
];
643 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
645 /* The in-kernel checksum calculation is always 16bit on
646 * the alpha, though it is 32 bit on i386...
647 * I wonder what it is elsewhere... (it uses an API in
648 * a way that it shouldn't).
650 csum
= (csum
& 0xffff) + (csum
>> 16);
651 csum
= (csum
& 0xffff) + (csum
>> 16);
657 char *human_size(long long bytes
)
661 /* We convert bytes to either centi-M{ega,ibi}bytes or
662 * centi-G{igi,ibi}bytes, with appropriate rounding,
663 * and then print 1/100th of those as a decimal.
664 * We allow upto 2048Megabytes before converting to
665 * gigabytes, as that shows more precision and isn't
666 * too large a number.
667 * Terabytes are not yet handled.
670 if (bytes
< 5000*1024)
672 else if (bytes
< 2*1024LL*1024LL*1024LL) {
673 long cMiB
= (bytes
/ ( (1LL<<20) / 200LL ) +1) /2;
674 long cMB
= (bytes
/ ( 1000000LL / 200LL ) +1) /2;
675 snprintf(buf
, sizeof(buf
), " (%ld.%02ld MiB %ld.%02ld MB)",
676 cMiB
/100 , cMiB
% 100,
679 long cGiB
= (bytes
/ ( (1LL<<30) / 200LL ) +1) /2;
680 long cGB
= (bytes
/ (1000000000LL/200LL ) +1) /2;
681 snprintf(buf
, sizeof(buf
), " (%ld.%02ld GiB %ld.%02ld GB)",
682 cGiB
/100 , cGiB
% 100,
688 char *human_size_brief(long long bytes
, int prefix
)
692 /* We convert bytes to either centi-M{ega,ibi}bytes or
693 * centi-G{igi,ibi}bytes, with appropriate rounding,
694 * and then print 1/100th of those as a decimal.
695 * We allow upto 2048Megabytes before converting to
696 * gigabytes, as that shows more precision and isn't
697 * too large a number.
698 * Terabytes are not yet handled.
700 * If prefix == IEC, we mean prefixes like kibi,mebi,gibi etc.
701 * If prefix == JEDEC, we mean prefixes like kilo,mega,giga etc.
704 if (bytes
< 5000*1024)
706 else if (prefix
== IEC
) {
707 if (bytes
< 2*1024LL*1024LL*1024LL) {
708 long cMiB
= (bytes
/ ( (1LL<<20) / 200LL ) +1) /2;
709 snprintf(buf
, sizeof(buf
), "%ld.%02ldMiB",
710 cMiB
/100 , cMiB
% 100);
712 long cGiB
= (bytes
/ ( (1LL<<30) / 200LL ) +1) /2;
713 snprintf(buf
, sizeof(buf
), "%ld.%02ldGiB",
714 cGiB
/100 , cGiB
% 100);
717 else if (prefix
== JEDEC
) {
718 if (bytes
< 2*1024LL*1024LL*1024LL) {
719 long cMB
= (bytes
/ ( 1000000LL / 200LL ) +1) /2;
720 snprintf(buf
, sizeof(buf
), "%ld.%02ldMB",
723 long cGB
= (bytes
/ (1000000000LL/200LL ) +1) /2;
724 snprintf(buf
, sizeof(buf
), "%ld.%02ldGB",
725 cGB
/100 , cGB
% 100);
734 void print_r10_layout(int layout
)
736 int near
= layout
& 255;
737 int far
= (layout
>> 8) & 255;
738 int offset
= (layout
&0x10000);
742 printf("%s near=%d", sep
, near
);
746 printf("%s %s=%d", sep
, offset
?"offset":"far", far
);
748 printf("NO REDUNDANCY");
752 unsigned long long calc_array_size(int level
, int raid_disks
, int layout
,
753 int chunksize
, unsigned long long devsize
)
757 devsize
&= ~(unsigned long long)((chunksize
>>9)-1);
758 return get_data_disks(level
, layout
, raid_disks
) * devsize
;
761 int get_data_disks(int level
, int layout
, int raid_disks
)
765 case 0: data_disks
= raid_disks
;
767 case 1: data_disks
= 1;
770 case 5: data_disks
= raid_disks
- 1;
772 case 6: data_disks
= raid_disks
- 2;
774 case 10: data_disks
= raid_disks
/ (layout
& 255) / ((layout
>>8)&255);
781 int devnm2devid(char *devnm
)
783 /* First look in /sys/block/$DEVNM/dev for %d:%d
784 * If that fails, try parsing out a number
791 sprintf(path
, "/sys/block/%s/dev", devnm
);
792 fd
= open(path
, O_RDONLY
);
795 int n
= read(fd
, buf
, sizeof(buf
));
799 if (n
> 0 && sscanf(buf
, "%d:%d\n", &mjr
, &mnr
) == 2)
800 return makedev(mjr
, mnr
);
802 if (strncmp(devnm
, "md_d", 4) == 0 &&
804 (mnr
= strtoul(devnm
+4, &ep
, 10)) >= 0 &&
805 ep
> devnm
&& *ep
== 0)
806 return makedev(get_mdp_major(), mnr
<< MdpMinorShift
);
808 if (strncmp(devnm
, "md", 2) == 0 &&
810 (mnr
= strtoul(devnm
+2, &ep
, 10)) >= 0 &&
811 ep
> devnm
&& *ep
== 0)
812 return makedev(MD_MAJOR
, mnr
);
817 #if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)
818 char *get_md_name(char *devnm
)
820 /* find /dev/md%d or /dev/md/%d or make a device /dev/.tmp.md%d */
821 /* if dev < 0, want /dev/md/d%d or find mdp in /proc/devices ... */
823 static char devname
[50];
825 dev_t rdev
= devnm2devid(devnm
);
830 if (strncmp(devnm
, "md_", 3) == 0) {
831 snprintf(devname
, sizeof(devname
), "/dev/md/%s",
833 if (stat(devname
, &stb
) == 0
834 && (S_IFMT
&stb
.st_mode
) == S_IFBLK
835 && (stb
.st_rdev
== rdev
))
838 snprintf(devname
, sizeof(devname
), "/dev/%s", devnm
);
839 if (stat(devname
, &stb
) == 0
840 && (S_IFMT
&stb
.st_mode
) == S_IFBLK
841 && (stb
.st_rdev
== rdev
))
844 snprintf(devname
, sizeof(devname
), "/dev/md/%s", devnm
+2);
845 if (stat(devname
, &stb
) == 0
846 && (S_IFMT
&stb
.st_mode
) == S_IFBLK
847 && (stb
.st_rdev
== rdev
))
850 dn
= map_dev(major(rdev
), minor(rdev
), 0);
853 snprintf(devname
, sizeof(devname
), "/dev/.tmp.%s", devnm
);
854 if (mknod(devname
, S_IFBLK
| 0600, rdev
) == -1)
858 if (stat(devname
, &stb
) == 0
859 && (S_IFMT
&stb
.st_mode
) == S_IFBLK
860 && (stb
.st_rdev
== rdev
))
866 void put_md_name(char *name
)
868 if (strncmp(name
, "/dev/.tmp.md", 12) == 0)
872 char *find_free_devnm(int use_partitions
)
874 static char devnm
[32];
876 for (devnum
= 127; devnum
!= 128;
877 devnum
= devnum
? devnum
-1 : (1<<20)-1) {
880 sprintf(devnm
, "md_d%d", devnum
);
882 sprintf(devnm
, "md%d", devnum
);
883 if (mddev_busy(devnm
))
885 if (!conf_name_is_free(devnm
))
888 /* make sure it is new to /dev too, at least as a
890 int devid
= devnm2devid(devnm
);
892 char *dn
= map_dev(major(devid
),
894 if (dn
&& ! is_standard(dn
, NULL
))
904 #endif /* !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) */
906 int dev_open(char *dev
, int flags
)
908 /* like 'open', but if 'dev' matches %d:%d, create a temp
909 * block device and open that
920 major
= strtoul(dev
, &e
, 0);
921 if (e
> dev
&& *e
== ':' && e
[1] &&
922 (minor
= strtoul(e
+1, &e
, 0)) >= 0 &&
924 snprintf(devname
, sizeof(devname
), "/dev/.tmp.md.%d:%d:%d",
925 (int)getpid(), major
, minor
);
926 if (mknod(devname
, S_IFBLK
|0600, makedev(major
, minor
)) == 0) {
927 fd
= open(devname
, flags
);
931 /* Try /tmp as /dev appear to be read-only */
932 snprintf(devname
, sizeof(devname
), "/tmp/.tmp.md.%d:%d:%d",
933 (int)getpid(), major
, minor
);
934 if (mknod(devname
, S_IFBLK
|0600, makedev(major
, minor
)) == 0) {
935 fd
= open(devname
, flags
);
940 fd
= open(dev
, flags
);
944 int open_dev_flags(char *devnm
, int flags
)
949 devid
= devnm2devid(devnm
);
950 sprintf(buf
, "%d:%d", major(devid
), minor(devid
));
951 return dev_open(buf
, flags
);
954 int open_dev(char *devnm
)
956 return open_dev_flags(devnm
, O_RDONLY
);
959 int open_dev_excl(char *devnm
)
964 int devid
= devnm2devid(devnm
);
966 sprintf(buf
, "%d:%d", major(devid
), minor(devid
));
967 for (i
= 0 ; i
< 25 ; i
++) {
968 int fd
= dev_open(buf
, flags
|O_EXCL
);
971 if (errno
== EACCES
&& flags
== O_RDWR
) {
982 int same_dev(char *one
, char *two
)
984 struct stat st1
, st2
;
985 if (stat(one
, &st1
) != 0)
987 if (stat(two
, &st2
) != 0)
989 if ((st1
.st_mode
& S_IFMT
) != S_IFBLK
)
991 if ((st2
.st_mode
& S_IFMT
) != S_IFBLK
)
993 return st1
.st_rdev
== st2
.st_rdev
;
996 void wait_for(char *dev
, int fd
)
999 struct stat stb_want
;
1001 if (fstat(fd
, &stb_want
) != 0 ||
1002 (stb_want
.st_mode
& S_IFMT
) != S_IFBLK
)
1005 for (i
= 0 ; i
< 25 ; i
++) {
1007 if (stat(dev
, &stb
) == 0 &&
1008 (stb
.st_mode
& S_IFMT
) == S_IFBLK
&&
1009 (stb
.st_rdev
== stb_want
.st_rdev
))
1014 dprintf("%s: timeout waiting for %s\n", __func__
, dev
);
1017 struct superswitch
*superlist
[] =
1020 &super_ddf
, &super_imsm
,
1024 #if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)
1026 struct supertype
*super_by_fd(int fd
, char **subarrayp
)
1028 mdu_array_info_t array
;
1031 struct supertype
*st
= NULL
;
1036 char *subarray
= NULL
;
1037 char container
[32] = "";
1039 sra
= sysfs_read(fd
, NULL
, GET_VERSION
);
1042 vers
= sra
->array
.major_version
;
1043 minor
= sra
->array
.minor_version
;
1044 verstr
= sra
->text_version
;
1046 if (ioctl(fd
, GET_ARRAY_INFO
, &array
))
1047 array
.major_version
= array
.minor_version
= 0;
1048 vers
= array
.major_version
;
1049 minor
= array
.minor_version
;
1054 sprintf(version
, "%d.%d", vers
, minor
);
1057 if (minor
== -2 && is_subarray(verstr
)) {
1058 char *dev
= verstr
+1;
1060 subarray
= strchr(dev
, '/');
1063 subarray
= xstrdup(subarray
);
1065 strcpy(container
, dev
);
1068 sra
= sysfs_read(-1, container
, GET_VERSION
);
1069 if (sra
&& sra
->text_version
[0])
1070 verstr
= sra
->text_version
;
1072 verstr
= "-no-metadata-";
1075 for (i
= 0; st
== NULL
&& superlist
[i
] ; i
++)
1076 st
= superlist
[i
]->match_metadata_desc(verstr
);
1083 *subarrayp
= subarray
;
1084 strcpy(st
->container_devnm
, container
);
1085 strcpy(st
->devnm
, fd2devnm(fd
));
1091 #endif /* !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) */
1093 int dev_size_from_id(dev_t id
, unsigned long long *size
)
1098 sprintf(buf
, "%d:%d", major(id
), minor(id
));
1099 fd
= dev_open(buf
, O_RDONLY
);
1102 if (get_dev_size(fd
, NULL
, size
)) {
1110 struct supertype
*dup_super(struct supertype
*orig
)
1112 struct supertype
*st
;
1116 st
= xcalloc(1, sizeof(*st
));
1118 st
->max_devs
= orig
->max_devs
;
1119 st
->minor_version
= orig
->minor_version
;
1120 st
->ignore_hw_compat
= orig
->ignore_hw_compat
;
1126 struct supertype
*guess_super_type(int fd
, enum guess_types guess_type
)
1128 /* try each load_super to find the best match,
1129 * and return the best superswitch
1131 struct superswitch
*ss
;
1132 struct supertype
*st
;
1133 time_t besttime
= 0;
1137 st
= xcalloc(1, sizeof(*st
));
1138 st
->container_devnm
[0] = 0;
1140 for (i
= 0 ; superlist
[i
]; i
++) {
1143 if (guess_type
== guess_array
&& ss
->add_to_super
== NULL
)
1145 if (guess_type
== guess_partitions
&& ss
->add_to_super
!= NULL
)
1147 memset(st
, 0, sizeof(*st
));
1148 st
->ignore_hw_compat
= 1;
1149 rv
= ss
->load_super(st
, fd
, NULL
);
1152 st
->ss
->getinfo_super(st
, &info
, NULL
);
1153 if (bestsuper
== -1 ||
1154 besttime
< info
.array
.ctime
) {
1156 besttime
= info
.array
.ctime
;
1161 if (bestsuper
!= -1) {
1163 memset(st
, 0, sizeof(*st
));
1164 st
->ignore_hw_compat
= 1;
1165 rv
= superlist
[bestsuper
]->load_super(st
, fd
, NULL
);
1167 superlist
[bestsuper
]->free_super(st
);
1175 /* Return size of device in bytes */
1176 int get_dev_size(int fd
, char *dname
, unsigned long long *sizep
)
1178 unsigned long long ldsize
;
1181 if (fstat(fd
, &st
) != -1 && S_ISREG(st
.st_mode
))
1182 ldsize
= (unsigned long long)st
.st_size
;
1185 if (ioctl(fd
, BLKGETSIZE64
, &ldsize
) != 0)
1188 unsigned long dsize
;
1189 if (ioctl(fd
, BLKGETSIZE
, &dsize
) == 0) {
1194 pr_err("Cannot get size of %s: %s\b",
1195 dname
, strerror(errno
));
1203 /* Return true if this can only be a container, not a member device.
1204 * i.e. is and md device and size is zero
1206 int must_be_container(int fd
)
1208 unsigned long long size
;
1209 if (md_get_version(fd
) < 0)
1211 if (get_dev_size(fd
, NULL
, &size
) == 0)
1218 /* Sets endofpart parameter to the last block used by the last GPT partition on the device.
1219 * Returns: 1 if successful
1220 * -1 for unknown partition type
1221 * 0 for other errors
1223 static int get_gpt_last_partition_end(int fd
, unsigned long long *endofpart
)
1226 unsigned char empty_gpt_entry
[16]= {0};
1227 struct GPT_part_entry
*part
;
1229 unsigned long long curr_part_end
;
1230 unsigned all_partitions
, entry_size
;
1235 BUILD_BUG_ON(sizeof(gpt
) != 512);
1236 /* skip protective MBR */
1237 lseek(fd
, 512, SEEK_SET
);
1238 /* read GPT header */
1239 if (read(fd
, &gpt
, 512) != 512)
1242 /* get the number of partition entries and the entry size */
1243 all_partitions
= __le32_to_cpu(gpt
.part_cnt
);
1244 entry_size
= __le32_to_cpu(gpt
.part_size
);
1246 /* Check GPT signature*/
1247 if (gpt
.magic
!= GPT_SIGNATURE_MAGIC
)
1251 if (all_partitions
> 1024 ||
1252 entry_size
> sizeof(buf
))
1255 part
= (struct GPT_part_entry
*)buf
;
1257 for (part_nr
= 0; part_nr
< all_partitions
; part_nr
++) {
1258 /* read partition entry */
1259 if (read(fd
, buf
, entry_size
) != (ssize_t
)entry_size
)
1262 /* is this valid partition? */
1263 if (memcmp(part
->type_guid
, empty_gpt_entry
, 16) != 0) {
1264 /* check the last lba for the current partition */
1265 curr_part_end
= __le64_to_cpu(part
->ending_lba
);
1266 if (curr_part_end
> *endofpart
)
1267 *endofpart
= curr_part_end
;
1274 /* Sets endofpart parameter to the last block used by the last partition on the device.
1275 * Returns: 1 if successful
1276 * -1 for unknown partition type
1277 * 0 for other errors
1279 static int get_last_partition_end(int fd
, unsigned long long *endofpart
)
1281 struct MBR boot_sect
;
1282 struct MBR_part_record
*part
;
1283 unsigned long long curr_part_end
;
1289 BUILD_BUG_ON(sizeof(boot_sect
) != 512);
1292 if (read(fd
, &boot_sect
, 512) != 512)
1295 /* check MBP signature */
1296 if (boot_sect
.magic
== MBR_SIGNATURE_MAGIC
) {
1298 /* found the correct signature */
1299 part
= boot_sect
.parts
;
1301 for (part_nr
= 0; part_nr
< MBR_PARTITIONS
; part_nr
++) {
1302 /* check for GPT type */
1303 if (part
->part_type
== MBR_GPT_PARTITION_TYPE
) {
1304 retval
= get_gpt_last_partition_end(fd
, endofpart
);
1307 /* check the last used lba for the current partition */
1308 curr_part_end
= __le32_to_cpu(part
->first_sect_lba
) +
1309 __le32_to_cpu(part
->blocks_num
);
1310 if (curr_part_end
> *endofpart
)
1311 *endofpart
= curr_part_end
;
1316 /* Unknown partition table */
1323 int check_partitions(int fd
, char *dname
, unsigned long long freesize
,
1324 unsigned long long size
)
1327 * Check where the last partition ends
1329 unsigned long long endofpart
;
1332 if ((ret
= get_last_partition_end(fd
, &endofpart
)) > 0) {
1333 /* There appears to be a partition table here */
1334 if (freesize
== 0) {
1335 /* partitions will not be visible in new device */
1336 pr_err("partition table exists on %s but will be lost or\n"
1337 " meaningless after creating array\n",
1340 } else if (endofpart
> freesize
) {
1341 /* last partition overlaps metadata */
1342 pr_err("metadata will over-write last partition on %s.\n",
1345 } else if (size
&& endofpart
> size
) {
1346 /* partitions will be truncated in new device */
1347 pr_err("array size is too small to cover all partitions on %s.\n",
1355 int open_container(int fd
)
1357 /* 'fd' is a block device. Find out if it is in use
1358 * by a container, and return an open fd on that container.
1369 if (fstat(fd
, &st
) != 0)
1371 sprintf(path
, "/sys/dev/block/%d:%d/holders",
1372 (int)major(st
.st_rdev
), (int)minor(st
.st_rdev
));
1373 e
= path
+ strlen(path
);
1375 dir
= opendir(path
);
1378 while ((de
= readdir(dir
))) {
1381 if (de
->d_name
[0] == '.')
1383 /* Need to make sure it is a container and not a volume */
1384 sprintf(e
, "/%s/md/metadata_version", de
->d_name
);
1385 dfd
= open(path
, O_RDONLY
);
1388 n
= read(dfd
, buf
, sizeof(buf
));
1390 if (n
<= 0 || (unsigned)n
>= sizeof(buf
))
1393 if (strncmp(buf
, "external", 8) != 0 ||
1397 sprintf(e
, "/%s/dev", de
->d_name
);
1398 dfd
= open(path
, O_RDONLY
);
1401 n
= read(dfd
, buf
, sizeof(buf
));
1403 if (n
<= 0 || (unsigned)n
>= sizeof(buf
))
1406 if (sscanf(buf
, "%d:%d", &major
, &minor
) != 2)
1408 sprintf(buf
, "%d:%d", major
, minor
);
1409 dfd
= dev_open(buf
, O_RDONLY
);
1419 struct superswitch
*version_to_superswitch(char *vers
)
1423 for (i
= 0; superlist
[i
]; i
++) {
1424 struct superswitch
*ss
= superlist
[i
];
1426 if (strcmp(vers
, ss
->name
) == 0)
1433 int metadata_container_matches(char *metadata
, char *devnm
)
1435 /* Check if 'devnm' is the container named in 'metadata'
1437 * /containername/componentname or
1438 * -containername/componentname
1441 if (*metadata
!= '/' && *metadata
!= '-')
1444 if (strncmp(metadata
+1, devnm
, l
) != 0)
1446 if (metadata
[l
+1] != '/')
1451 int metadata_subdev_matches(char *metadata
, char *devnm
)
1453 /* Check if 'devnm' is the subdev named in 'metadata'
1455 * /containername/subdev or
1456 * -containername/subdev
1459 if (*metadata
!= '/' && *metadata
!= '-')
1461 sl
= strchr(metadata
+1, '/');
1464 if (strcmp(sl
+1, devnm
) == 0)
1469 int is_container_member(struct mdstat_ent
*mdstat
, char *container
)
1471 if (mdstat
->metadata_version
== NULL
||
1472 strncmp(mdstat
->metadata_version
, "external:", 9) != 0 ||
1473 !metadata_container_matches(mdstat
->metadata_version
+9, container
))
1479 int is_subarray_active(char *subarray
, char *container
)
1481 struct mdstat_ent
*mdstat
= mdstat_read(0, 0);
1482 struct mdstat_ent
*ent
;
1484 for (ent
= mdstat
; ent
; ent
= ent
->next
)
1485 if (is_container_member(ent
, container
))
1486 if (strcmp(to_subarray(ent
, container
), subarray
) == 0)
1489 free_mdstat(mdstat
);
1494 /* open_subarray - opens a subarray in a container
1495 * @dev: container device name
1496 * @st: empty supertype
1497 * @quiet: block reporting errors flag
1499 * On success returns an fd to a container and fills in *st
1501 int open_subarray(char *dev
, char *subarray
, struct supertype
*st
, int quiet
)
1504 struct mdinfo
*info
;
1508 fd
= open(dev
, O_RDWR
|O_EXCL
);
1511 pr_err("Couldn't open %s, aborting\n",
1516 _devnm
= fd2devnm(fd
);
1517 if (_devnm
== NULL
) {
1519 pr_err("Failed to determine device number for %s\n",
1523 strcpy(st
->devnm
, _devnm
);
1525 mdi
= sysfs_read(fd
, st
->devnm
, GET_VERSION
|GET_LEVEL
);
1528 pr_err("Failed to read sysfs for %s\n",
1533 if (mdi
->array
.level
!= UnSet
) {
1535 pr_err("%s is not a container\n", dev
);
1539 st
->ss
= version_to_superswitch(mdi
->text_version
);
1542 pr_err("Operation not supported for %s metadata\n",
1547 if (st
->devnm
[0] == 0) {
1549 pr_err("Failed to allocate device name\n");
1553 if (!st
->ss
->load_container
) {
1555 pr_err("%s is not a container\n", dev
);
1559 if (st
->ss
->load_container(st
, fd
, NULL
)) {
1561 pr_err("Failed to load metadata for %s\n",
1566 info
= st
->ss
->container_content(st
, subarray
);
1569 pr_err("Failed to find subarray-%s in %s\n",
1579 st
->ss
->free_super(st
);
1592 int add_disk(int mdfd
, struct supertype
*st
,
1593 struct mdinfo
*sra
, struct mdinfo
*info
)
1595 /* Add a device to an array, in one of 2 ways. */
1598 if (st
->ss
->external
) {
1599 if (info
->disk
.state
& (1<<MD_DISK_SYNC
))
1600 info
->recovery_start
= MaxSector
;
1602 info
->recovery_start
= 0;
1603 rv
= sysfs_add_disk(sra
, info
, 0);
1606 for (sd2
= sra
->devs
; sd2
; sd2
=sd2
->next
)
1610 sd2
= xmalloc(sizeof(*sd2
));
1612 sd2
->next
= sra
->devs
;
1618 rv
= ioctl(mdfd
, ADD_NEW_DISK
, &info
->disk
);
1622 int remove_disk(int mdfd
, struct supertype
*st
,
1623 struct mdinfo
*sra
, struct mdinfo
*info
)
1626 /* Remove the disk given by 'info' from the array */
1628 if (st
->ss
->external
)
1629 rv
= sysfs_set_str(sra
, info
, "slot", "none");
1632 rv
= ioctl(mdfd
, HOT_REMOVE_DISK
, makedev(info
->disk
.major
,
1637 int set_array_info(int mdfd
, struct supertype
*st
, struct mdinfo
*info
)
1639 /* Initialise kernel's knowledge of array.
1640 * This varies between externally managed arrays
1643 int vers
= md_get_version(mdfd
);
1647 if (st
->ss
->external
)
1648 rv
= sysfs_set_array(info
, vers
);
1651 if ((vers
% 100) >= 1) { /* can use different versions */
1652 mdu_array_info_t inf
;
1653 memset(&inf
, 0, sizeof(inf
));
1654 inf
.major_version
= info
->array
.major_version
;
1655 inf
.minor_version
= info
->array
.minor_version
;
1656 rv
= ioctl(mdfd
, SET_ARRAY_INFO
, &inf
);
1658 rv
= ioctl(mdfd
, SET_ARRAY_INFO
, NULL
);
1662 unsigned long long min_recovery_start(struct mdinfo
*array
)
1664 /* find the minimum recovery_start in an array for metadata
1665 * formats that only record per-array recovery progress instead
1668 unsigned long long recovery_start
= MaxSector
;
1671 for (d
= array
->devs
; d
; d
= d
->next
)
1672 recovery_start
= min(recovery_start
, d
->recovery_start
);
1674 return recovery_start
;
1677 int mdmon_pid(char *devnm
)
1684 sprintf(path
, "%s/%s.pid", MDMON_DIR
, devnm
);
1686 fd
= open(path
, O_RDONLY
| O_NOATIME
, 0);
1690 n
= read(fd
, pid
, 9);
1697 int mdmon_running(char *devnm
)
1699 int pid
= mdmon_pid(devnm
);
1702 if (kill(pid
, 0) == 0)
1707 int start_mdmon(char *devnm
)
1721 if (check_env("MDADM_NO_MDMON"))
1724 len
= readlink("/proc/self/exe", pathbuf
, sizeof(pathbuf
)-1);
1728 sl
= strrchr(pathbuf
, '/');
1733 strcpy(sl
, "mdmon");
1737 /* First try to run systemctl */
1740 /* FIXME yuk. CLOSE_EXEC?? */
1742 for (i
= 3; skipped
< 20; i
++)
1748 /* Don't want to see error messages from systemctl.
1749 * If the service doesn't exist, we start mdmon ourselves.
1752 open("/dev/null", O_WRONLY
);
1753 snprintf(pathbuf
, sizeof(pathbuf
), "mdmon@%s.service",
1755 status
= execl("/usr/bin/systemctl", "systemctl", "start",
1757 status
= execl("/bin/systemctl", "systemctl", "start",
1760 case -1: pr_err("cannot run mdmon. "
1761 "Array remains readonly\n");
1763 default: /* parent - good */
1764 pid
= wait(&status
);
1765 if (pid
>= 0 && status
== 0)
1769 /* That failed, try running mdmon directly */
1772 /* FIXME yuk. CLOSE_EXEC?? */
1774 for (i
= 3; skipped
< 20; i
++)
1780 for (i
= 0; paths
[i
]; i
++)
1782 execl(paths
[i
], "mdmon",
1786 case -1: pr_err("cannot run mdmon. "
1787 "Array remains readonly\n");
1789 default: /* parent - good */
1790 pid
= wait(&status
);
1791 if (pid
< 0 || status
!= 0) {
1792 pr_err("failed to launch mdmon. "
1793 "Array remains readonly\n");
1800 __u32
random32(void)
1803 int rfd
= open("/dev/urandom", O_RDONLY
);
1804 if (rfd
< 0 || read(rfd
, &rv
, 4) != 4)
1812 int flush_metadata_updates(struct supertype
*st
)
1816 st
->update_tail
= NULL
;
1820 sfd
= connect_monitor(st
->container_devnm
);
1824 while (st
->updates
) {
1825 struct metadata_update
*mu
= st
->updates
;
1826 st
->updates
= mu
->next
;
1828 send_message(sfd
, mu
, 0);
1836 st
->update_tail
= NULL
;
1840 void append_metadata_update(struct supertype
*st
, void *buf
, int len
)
1843 struct metadata_update
*mu
= xmalloc(sizeof(*mu
));
1848 mu
->space_list
= NULL
;
1850 *st
->update_tail
= mu
;
1851 st
->update_tail
= &mu
->next
;
1853 #endif /* MDASSEMBLE */
1856 /* tinyc doesn't optimize this check in ioctl.h out ... */
1857 unsigned int __invalid_size_argument_for_IOC
= 0;
1860 int experimental(void)
1862 if (check_env("MDADM_EXPERIMENTAL"))
1865 pr_err("To use this feature MDADM_EXPERIMENTAL"
1866 " environment variable has to be defined.\n");
1871 /* Pick all spares matching given criteria from a container
1872 * if min_size == 0 do not check size
1873 * if domlist == NULL do not check domains
1874 * if spare_group given add it to domains of each spare
1875 * metadata allows to test domains using metadata of destination array */
1876 struct mdinfo
*container_choose_spares(struct supertype
*st
,
1877 unsigned long long min_size
,
1878 struct domainlist
*domlist
,
1880 const char *metadata
, int get_one
)
1882 struct mdinfo
*d
, **dp
, *disks
= NULL
;
1884 /* get list of all disks in container */
1885 if (st
->ss
->getinfo_super_disks
)
1886 disks
= st
->ss
->getinfo_super_disks(st
);
1890 /* find spare devices on the list */
1892 disks
->array
.spare_disks
= 0;
1896 if (d
->disk
.state
== 0) {
1897 /* check if size is acceptable */
1898 unsigned long long dev_size
;
1899 dev_t dev
= makedev(d
->disk
.major
,d
->disk
.minor
);
1902 (dev_size_from_id(dev
, &dev_size
) &&
1903 dev_size
>= min_size
))
1905 /* check if domain matches */
1906 if (found
&& domlist
) {
1907 struct dev_policy
*pol
= devid_policy(dev
);
1909 pol_add(&pol
, pol_domain
,
1911 if (domain_test(domlist
, pol
, metadata
) != 1)
1913 dev_policy_free(pol
);
1918 disks
->array
.spare_disks
++;
1932 /* Checks if paths point to the same device
1933 * Returns 0 if they do.
1934 * Returns 1 if they don't.
1935 * Returns -1 if something went wrong,
1936 * e.g. paths are empty or the files
1937 * they point to don't exist */
1938 int compare_paths (char* path1
, char* path2
)
1940 struct stat st1
,st2
;
1942 if (path1
== NULL
|| path2
== NULL
)
1944 if (stat(path1
,&st1
) != 0)
1946 if (stat(path2
,&st2
) != 0)
1948 if ((st1
.st_ino
== st2
.st_ino
) && (st1
.st_dev
== st2
.st_dev
))
1953 /* Make sure we can open as many devices as needed */
1954 void enable_fds(int devices
)
1956 unsigned int fds
= 20 + devices
;
1958 if (getrlimit(RLIMIT_NOFILE
, &lim
) != 0
1959 || lim
.rlim_cur
>= fds
)
1961 if (lim
.rlim_max
< fds
)
1964 setrlimit(RLIMIT_NOFILE
, &lim
);