2 * mdadm - manage Linux "md" devices aka RAID arrays.
4 * Copyright (C) 2001-2013 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>
33 #include <linux/magic.h>
42 * following taken from linux/blkpg.h because they aren't
43 * anywhere else and it isn't safe to #include linux/ * stuff.
46 #define BLKPG _IO(0x12,105)
48 /* The argument structure */
49 struct blkpg_ioctl_arg
{
56 /* The subfunctions (for the op field) */
57 #define BLKPG_ADD_PARTITION 1
58 #define BLKPG_DEL_PARTITION 2
60 /* Sizes of name fields. Unused at present. */
61 #define BLKPG_DEVNAMELTH 64
62 #define BLKPG_VOLNAMELTH 64
64 /* The data structure for ADD_PARTITION and DEL_PARTITION */
65 struct blkpg_partition
{
66 long long start
; /* starting offset in bytes */
67 long long length
; /* length in bytes */
68 int pno
; /* partition number */
69 char devname
[BLKPG_DEVNAMELTH
]; /* partition name, like sda5 or c0d1p2,
70 to be used in kernel messages */
71 char volname
[BLKPG_VOLNAMELTH
]; /* volume label */
76 /* Force a compilation error if condition is true */
77 #define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition))
79 /* Force a compilation error if condition is true, but also produce a
80 result (of value 0 and type size_t), so the expression can be used
81 e.g. in a structure initializer (or where-ever else comma expressions
83 #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
85 static int is_dlm_hooks_ready
= 0;
87 int dlm_funs_ready(void)
89 return is_dlm_hooks_ready
? 1 : 0;
92 static struct dlm_hooks
*dlm_hooks
= NULL
;
93 struct dlm_lock_resource
*dlm_lock_res
= NULL
;
94 static int ast_called
= 0;
96 struct dlm_lock_resource
{
101 /* Using poll(2) to wait for and dispatch ASTs */
102 static int poll_for_ast(dlm_lshandle_t ls
)
106 pfd
.fd
= dlm_hooks
->ls_get_fd(ls
);
111 if (poll(&pfd
, 1, 0) < 0)
116 dlm_hooks
->dispatch(dlm_hooks
->ls_get_fd(ls
));
123 static void dlm_ast(void *arg
)
128 static char *cluster_name
= NULL
;
129 /* Create the lockspace, take bitmapXXX locks on all the bitmaps. */
130 int cluster_get_dlmlock(int *lockid
)
134 int flags
= LKF_NOQUEUE
;
136 ret
= get_cluster_name(&cluster_name
);
138 pr_err("The md can't get cluster name\n");
142 dlm_lock_res
= xmalloc(sizeof(struct dlm_lock_resource
));
143 dlm_lock_res
->ls
= dlm_hooks
->create_lockspace(cluster_name
, O_RDWR
);
144 if (!dlm_lock_res
->ls
) {
145 pr_err("%s failed to create lockspace\n", cluster_name
);
149 snprintf(str
, 64, "bitmap%s", cluster_name
);
150 ret
= dlm_hooks
->ls_lock(dlm_lock_res
->ls
, LKM_PWMODE
,
151 &dlm_lock_res
->lksb
, flags
, str
, strlen(str
),
152 0, dlm_ast
, dlm_lock_res
, NULL
, NULL
);
154 pr_err("error %d when get PW mode on lock %s\n", errno
, str
);
155 dlm_hooks
->release_lockspace(cluster_name
, dlm_lock_res
->ls
, 1);
159 /* Wait for it to complete */
160 poll_for_ast(dlm_lock_res
->ls
);
161 *lockid
= dlm_lock_res
->lksb
.sb_lkid
;
163 return dlm_lock_res
->lksb
.sb_status
;
166 int cluster_release_dlmlock(int lockid
)
173 ret
= dlm_hooks
->ls_unlock(dlm_lock_res
->ls
, lockid
, 0,
174 &dlm_lock_res
->lksb
, dlm_lock_res
);
176 pr_err("error %d happened when unlock\n", errno
);
177 /* XXX make sure the lock is unlocked eventually */
181 /* Wait for it to complete */
182 poll_for_ast(dlm_lock_res
->ls
);
184 errno
= dlm_lock_res
->lksb
.sb_status
;
185 if (errno
!= EUNLOCK
) {
186 pr_err("error %d happened in ast when unlock lockspace\n",
188 /* XXX make sure the lockspace is unlocked eventually */
192 ret
= dlm_hooks
->release_lockspace(cluster_name
, dlm_lock_res
->ls
, 1);
194 pr_err("error %d happened when release lockspace\n", errno
);
195 /* XXX make sure the lockspace is released eventually */
204 int md_array_valid(int fd
)
209 sra
= sysfs_read(fd
, NULL
, GET_ARRAY_STATE
);
211 if (sra
->array_state
!= ARRAY_UNKNOWN_STATE
)
219 * GET_ARRAY_INFO doesn't provide access to the proper state
220 * information, so fallback to a basic check for raid_disks != 0
222 ret
= ioctl(fd
, RAID_VERSION
);
228 int md_array_active(int fd
)
231 struct mdu_array_info_s array
;
234 sra
= sysfs_read(fd
, NULL
, GET_ARRAY_STATE
);
236 if (!md_array_is_active(sra
))
242 * GET_ARRAY_INFO doesn't provide access to the proper state
243 * information, so fallback to a basic check for raid_disks != 0
245 ret
= ioctl(fd
, GET_ARRAY_INFO
, &array
);
251 int md_array_is_active(struct mdinfo
*info
)
253 return (info
->array_state
!= ARRAY_CLEAR
&&
254 info
->array_state
!= ARRAY_INACTIVE
&&
255 info
->array_state
!= ARRAY_UNKNOWN_STATE
);
259 * Get array info from the kernel. Longer term we want to deprecate the
260 * ioctl and get it from sysfs.
262 int md_get_array_info(int fd
, struct mdu_array_info_s
*array
)
264 return ioctl(fd
, GET_ARRAY_INFO
, array
);
270 int md_set_array_info(int fd
, struct mdu_array_info_s
*array
)
272 return ioctl(fd
, SET_ARRAY_INFO
, array
);
276 * Get disk info from the kernel.
278 int md_get_disk_info(int fd
, struct mdu_disk_info_s
*disk
)
280 return ioctl(fd
, GET_DISK_INFO
, disk
);
284 * Parse a 128 bit uuid in 4 integers
285 * format is 32 hexx nibbles with options :.<space> separator
286 * If not exactly 32 hex digits are found, return 0
289 int parse_uuid(char *str
, int uuid
[4])
291 int hit
= 0; /* number of Hex digIT */
294 for (i
= 0; i
< 4; i
++)
297 while ((c
= *str
++) != 0) {
299 if (c
>= '0' && c
<= '9')
301 else if (c
>= 'a' && c
<= 'f')
303 else if (c
>= 'A' && c
<= 'F')
305 else if (strchr(":. -", c
))
320 int get_linux_version()
324 int a
= 0, b
= 0,c
= 0;
329 a
= strtoul(cp
, &cp
, 10);
331 b
= strtoul(cp
+1, &cp
, 10);
333 c
= strtoul(cp
+1, &cp
, 10);
335 return (a
*1000000)+(b
*1000)+c
;
338 int mdadm_version(char *version
)
346 cp
= strchr(version
, '-');
347 if (!cp
|| *(cp
+1) != ' ' || *(cp
+2) != 'v')
350 a
= strtoul(cp
, &cp
, 10);
353 b
= strtoul(cp
+1, &cp
, 10);
355 c
= strtoul(cp
+1, &cp
, 10);
358 if (*cp
!= ' ' && *cp
!= '-')
360 return (a
*1000000)+(b
*1000)+c
;
363 unsigned long long parse_size(char *size
)
365 /* parse 'size' which should be a number optionally
366 * followed by 'K', 'M', or 'G'.
367 * Without a suffix, K is assumed.
368 * Number returned is in sectors (half-K)
369 * INVALID_SECTORS returned on error.
372 long long s
= strtoll(size
, &c
, 10);
386 s
*= 1024 * 1024 * 2;
388 case 's': /* sectors */
399 int parse_layout_10(char *layout
)
403 /* Parse the layout string for raid10 */
404 /* 'f', 'o' or 'n' followed by a number <= raid_disks */
405 if ((layout
[0] != 'n' && layout
[0] != 'f' && layout
[0] != 'o') ||
406 (copies
= strtoul(layout
+1, &cp
, 10)) < 1 ||
410 if (layout
[0] == 'n')
412 else if (layout
[0] == 'o')
413 rv
= 0x10000 + (copies
<<8) + 1;
415 rv
= 1 + (copies
<<8);
419 int parse_layout_faulty(char *layout
)
421 /* Parse the layout string for 'faulty' */
422 int ln
= strcspn(layout
, "0123456789");
423 char *m
= xstrdup(layout
);
426 mode
= map_name(faultylayout
, m
);
430 return mode
| (atoi(layout
+ln
)<< ModeShift
);
433 long parse_num(char *num
)
435 /* Either return a valid number, or -1 */
437 long rv
= strtol(num
, &c
, 10);
438 if (rv
< 0 || *c
|| !num
[0])
444 int parse_cluster_confirm_arg(char *input
, char **devname
, int *slot
)
447 *slot
= strtoul(input
, &dev
, 10);
448 if (dev
== input
|| dev
[0] != ':')
454 void remove_partitions(int fd
)
456 /* remove partitions from this block devices.
457 * This is used for components added to an array
459 #ifdef BLKPG_DEL_PARTITION
460 struct blkpg_ioctl_arg a
;
461 struct blkpg_partition p
;
463 a
.op
= BLKPG_DEL_PARTITION
;
465 a
.datalen
= sizeof(p
);
467 memset(a
.data
, 0, a
.datalen
);
468 for (p
.pno
= 0; p
.pno
< 16; p
.pno
++)
469 ioctl(fd
, BLKPG
, &a
);
473 int test_partition(int fd
)
475 /* Check if fd is a whole-disk or a partition.
476 * BLKPG will return EINVAL on a partition, and BLKPG_DEL_PARTITION
477 * will return ENXIO on an invalid partition number.
479 struct blkpg_ioctl_arg a
;
480 struct blkpg_partition p
;
481 a
.op
= BLKPG_DEL_PARTITION
;
483 a
.datalen
= sizeof(p
);
485 memset(a
.data
, 0, a
.datalen
);
487 if (ioctl(fd
, BLKPG
, &a
) == 0)
488 /* Very unlikely, but not a partition */
490 if (errno
== ENXIO
|| errno
== ENOTTY
)
491 /* not a partition */
497 int test_partition_from_id(dev_t id
)
502 sprintf(buf
, "%d:%d", major(id
), minor(id
));
503 fd
= dev_open(buf
, O_RDONLY
);
506 rv
= test_partition(fd
);
511 int enough(int level
, int raid_disks
, int layout
, int clean
, char *avail
)
517 for (i
= 0; i
< raid_disks
; i
++)
518 avail_disks
+= !!avail
[i
];
522 /* This is the tricky one - we need to check
523 * which actual disks are present.
525 copies
= (layout
&255)* ((layout
>>8) & 255);
528 /* there must be one of the 'copies' form 'first' */
535 this = (this+1) % raid_disks
;
539 first
= (first
+(layout
&255)) % raid_disks
;
540 } while (first
!= 0);
543 case LEVEL_MULTIPATH
:
544 return avail_disks
>= 1;
547 return avail_disks
== raid_disks
;
549 return avail_disks
>= 1;
551 if (avail_disks
== raid_disks
- 1 &&
552 !avail
[raid_disks
- 1])
553 /* If just the parity device is missing, then we
554 * have enough, even if not clean
560 return avail_disks
>= raid_disks
-1;
562 return avail_disks
>= raid_disks
;
565 return avail_disks
>= raid_disks
-2;
567 return avail_disks
>= raid_disks
;
573 const int uuid_zero
[4] = { 0, 0, 0, 0 };
575 int same_uuid(int a
[4], int b
[4], int swapuuid
)
578 /* parse uuids are hostendian.
579 * uuid's from some superblocks are big-ending
580 * if there is a difference, we need to swap..
582 unsigned char *ac
= (unsigned char *)a
;
583 unsigned char *bc
= (unsigned char *)b
;
585 for (i
= 0; i
< 16; i
+= 4) {
586 if (ac
[i
+0] != bc
[i
+3] ||
587 ac
[i
+1] != bc
[i
+2] ||
588 ac
[i
+2] != bc
[i
+1] ||
603 void copy_uuid(void *a
, int b
[4], int swapuuid
)
606 /* parse uuids are hostendian.
607 * uuid's from some superblocks are big-ending
608 * if there is a difference, we need to swap..
610 unsigned char *ac
= (unsigned char *)a
;
611 unsigned char *bc
= (unsigned char *)b
;
613 for (i
= 0; i
< 16; i
+= 4) {
623 char *__fname_from_uuid(int id
[4], int swap
, char *buf
, char sep
)
630 copy_uuid(uuid
, id
, swap
);
631 for (i
= 0; i
< 4; i
++) {
634 for (j
= 3; j
>= 0; j
--) {
635 sprintf(c
,"%02x", (unsigned char) uuid
[j
+4*i
]);
643 char *fname_from_uuid(struct supertype
*st
, struct mdinfo
*info
,
646 // dirty hack to work around an issue with super1 superblocks...
647 // super1 superblocks need swapuuid set in order for assembly to
648 // work, but can't have it set if we want this printout to match
649 // all the other uuid printouts in super1.c, so we force swapuuid
650 // to 1 to make our printout match the rest of super1
651 return __fname_from_uuid(info
->uuid
, (st
->ss
== &super1
) ? 1 :
652 st
->ss
->swapuuid
, buf
, sep
);
655 int check_ext2(int fd
, char *name
)
658 * Check for an ext2fs file system.
659 * Superblock is always 1K at 1K offset
661 * s_magic is le16 at 56 == 0xEF53
662 * report mtime - le32 at 44
664 * logblksize - le32 at 24
666 unsigned char sb
[1024];
668 unsigned long long size
;
670 if (lseek(fd
, 1024,0)!= 1024)
672 if (read(fd
, sb
, 1024)!= 1024)
674 if (sb
[56] != 0x53 || sb
[57] != 0xef)
677 mtime
= sb
[44]|(sb
[45]|(sb
[46]|sb
[47]<<8)<<8)<<8;
678 bsize
= sb
[24]|(sb
[25]|(sb
[26]|sb
[27]<<8)<<8)<<8;
679 size
= sb
[4]|(sb
[5]|(sb
[6]|sb
[7]<<8)<<8)<<8;
681 pr_err("%s appears to contain an ext2fs file system\n",
683 cont_err("size=%lluK mtime=%s", size
, ctime(&mtime
));
687 int check_reiser(int fd
, char *name
)
690 * superblock is at 64K
692 * Magic string "ReIsErFs" or "ReIsEr2Fs" at 52
695 unsigned char sb
[1024];
696 unsigned long long size
;
697 if (lseek(fd
, 64*1024, 0) != 64*1024)
699 if (read(fd
, sb
, 1024) != 1024)
701 if (strncmp((char*)sb
+52, "ReIsErFs",8) != 0 &&
702 strncmp((char*)sb
+52, "ReIsEr2Fs",9) != 0)
704 pr_err("%s appears to contain a reiserfs file system\n",name
);
705 size
= sb
[0]|(sb
[1]|(sb
[2]|sb
[3]<<8)<<8)<<8;
706 cont_err("size = %lluK\n", size
*4);
711 int check_raid(int fd
, char *name
)
716 struct supertype
*st
= guess_super(fd
);
720 if (st
->ss
->add_to_super
!= NULL
) {
721 st
->ss
->load_super(st
, fd
, name
);
722 /* Looks like a raid array .. */
723 pr_err("%s appears to be part of a raid array:\n", name
);
724 st
->ss
->getinfo_super(st
, &info
, NULL
);
725 st
->ss
->free_super(st
);
726 crtime
= info
.array
.ctime
;
727 level
= map_num(pers
, info
.array
.level
);
730 cont_err("level=%s devices=%d ctime=%s",
731 level
, info
.array
.raid_disks
, ctime(&crtime
));
733 /* Looks like GPT or MBR */
734 pr_err("partition table exists on %s\n", name
);
739 int fstat_is_blkdev(int fd
, char *devname
, dev_t
*rdev
)
743 if (fstat(fd
, &stb
) != 0) {
744 pr_err("fstat failed for %s: %s\n", devname
, strerror(errno
));
747 if ((S_IFMT
& stb
.st_mode
) != S_IFBLK
) {
748 pr_err("%s is not a block device.\n", devname
);
756 int stat_is_blkdev(char *devname
, dev_t
*rdev
)
760 if (stat(devname
, &stb
) != 0) {
761 pr_err("stat failed for %s: %s\n", devname
, strerror(errno
));
764 if ((S_IFMT
& stb
.st_mode
) != S_IFBLK
) {
765 pr_err("%s is not a block device.\n", devname
);
777 for (i
= 0; i
< 5; i
++) {
779 fprintf(stderr
, "%s%s", mesg
, add
);
781 if (fgets(buf
, 100, stdin
)==NULL
)
783 if (buf
[0]=='y' || buf
[0]=='Y')
785 if (buf
[0]=='n' || buf
[0]=='N')
789 pr_err("assuming 'no'\n");
793 int is_standard(char *dev
, int *nump
)
795 /* tests if dev is a "standard" md dev name.
796 * i.e if the last component is "/dNN" or "/mdNN",
797 * where NN is a string of digits
798 * Returns 1 if a partitionable standard,
799 * -1 if non-partitonable,
800 * 0 if not a standard name.
802 char *d
= strrchr(dev
, '/');
807 if (strncmp(d
, "/d",2) == 0)
808 d
+= 2, type
= 1; /* /dev/md/dN{pM} */
809 else if (strncmp(d
, "/md_d", 5) == 0)
810 d
+= 5, type
= 1; /* /dev/md_dN{pM} */
811 else if (strncmp(d
, "/md", 3) == 0)
812 d
+= 3, type
= -1; /* /dev/mdN */
813 else if (d
-dev
> 3 && strncmp(d
-2, "md/", 3) == 0)
814 d
+= 1, type
= -1; /* /dev/md/N */
824 if (nump
) *nump
= num
;
829 unsigned long calc_csum(void *super
, int bytes
)
831 unsigned long long newcsum
= 0;
834 unsigned int *superc
= (unsigned int*) super
;
836 for(i
= 0; i
< bytes
/4; i
++)
837 newcsum
+= superc
[i
];
838 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
840 /* The in-kernel checksum calculation is always 16bit on
841 * the alpha, though it is 32 bit on i386...
842 * I wonder what it is elsewhere... (it uses an API in
843 * a way that it shouldn't).
845 csum
= (csum
& 0xffff) + (csum
>> 16);
846 csum
= (csum
& 0xffff) + (csum
>> 16);
851 char *human_size(long long bytes
)
855 /* We convert bytes to either centi-M{ega,ibi}bytes or
856 * centi-G{igi,ibi}bytes, with appropriate rounding,
857 * and then print 1/100th of those as a decimal.
858 * We allow upto 2048Megabytes before converting to
859 * gigabytes, as that shows more precision and isn't
860 * too large a number.
861 * Terabytes are not yet handled.
864 if (bytes
< 5000*1024)
866 else if (bytes
< 2*1024LL*1024LL*1024LL) {
867 long cMiB
= (bytes
* 200LL / (1LL<<20) + 1) / 2;
868 long cMB
= (bytes
/ ( 1000000LL / 200LL ) +1) /2;
869 snprintf(buf
, sizeof(buf
), " (%ld.%02ld MiB %ld.%02ld MB)",
870 cMiB
/100, cMiB
% 100, cMB
/100, cMB
% 100);
872 long cGiB
= (bytes
* 200LL / (1LL<<30) +1) / 2;
873 long cGB
= (bytes
/ (1000000000LL/200LL ) +1) /2;
874 snprintf(buf
, sizeof(buf
), " (%ld.%02ld GiB %ld.%02ld GB)",
875 cGiB
/100, cGiB
% 100, cGB
/100, cGB
% 100);
880 char *human_size_brief(long long bytes
, int prefix
)
884 /* We convert bytes to either centi-M{ega,ibi}bytes or
885 * centi-G{igi,ibi}bytes, with appropriate rounding,
886 * and then print 1/100th of those as a decimal.
887 * We allow upto 2048Megabytes before converting to
888 * gigabytes, as that shows more precision and isn't
889 * too large a number.
890 * Terabytes are not yet handled.
892 * If prefix == IEC, we mean prefixes like kibi,mebi,gibi etc.
893 * If prefix == JEDEC, we mean prefixes like kilo,mega,giga etc.
896 if (bytes
< 5000*1024)
898 else if (prefix
== IEC
) {
899 if (bytes
< 2*1024LL*1024LL*1024LL) {
900 long cMiB
= (bytes
* 200LL / (1LL<<20) +1) /2;
901 snprintf(buf
, sizeof(buf
), "%ld.%02ldMiB",
902 cMiB
/100, cMiB
% 100);
904 long cGiB
= (bytes
* 200LL / (1LL<<30) +1) /2;
905 snprintf(buf
, sizeof(buf
), "%ld.%02ldGiB",
906 cGiB
/100, cGiB
% 100);
909 else if (prefix
== JEDEC
) {
910 if (bytes
< 2*1024LL*1024LL*1024LL) {
911 long cMB
= (bytes
/ ( 1000000LL / 200LL ) +1) /2;
912 snprintf(buf
, sizeof(buf
), "%ld.%02ldMB",
915 long cGB
= (bytes
/ (1000000000LL/200LL ) +1) /2;
916 snprintf(buf
, sizeof(buf
), "%ld.%02ldGB",
926 void print_r10_layout(int layout
)
928 int near
= layout
& 255;
929 int far
= (layout
>> 8) & 255;
930 int offset
= (layout
&0x10000);
934 printf("%s near=%d", sep
, near
);
938 printf("%s %s=%d", sep
, offset
?"offset":"far", far
);
940 printf("NO REDUNDANCY");
943 unsigned long long calc_array_size(int level
, int raid_disks
, int layout
,
944 int chunksize
, unsigned long long devsize
)
948 devsize
&= ~(unsigned long long)((chunksize
>>9)-1);
949 return get_data_disks(level
, layout
, raid_disks
) * devsize
;
952 int get_data_disks(int level
, int layout
, int raid_disks
)
956 case 0: data_disks
= raid_disks
;
958 case 1: data_disks
= 1;
961 case 5: data_disks
= raid_disks
- 1;
963 case 6: data_disks
= raid_disks
- 2;
965 case 10: data_disks
= raid_disks
/ (layout
& 255) / ((layout
>>8)&255);
972 dev_t
devnm2devid(char *devnm
)
974 /* First look in /sys/block/$DEVNM/dev for %d:%d
975 * If that fails, try parsing out a number
982 sprintf(path
, "/sys/block/%s/dev", devnm
);
983 fd
= open(path
, O_RDONLY
);
986 int n
= read(fd
, buf
, sizeof(buf
));
990 if (n
> 0 && sscanf(buf
, "%d:%d\n", &mjr
, &mnr
) == 2)
991 return makedev(mjr
, mnr
);
993 if (strncmp(devnm
, "md_d", 4) == 0 &&
995 (mnr
= strtoul(devnm
+4, &ep
, 10)) >= 0 &&
996 ep
> devnm
&& *ep
== 0)
997 return makedev(get_mdp_major(), mnr
<< MdpMinorShift
);
999 if (strncmp(devnm
, "md", 2) == 0 &&
1000 isdigit(devnm
[2]) &&
1001 (mnr
= strtoul(devnm
+2, &ep
, 10)) >= 0 &&
1002 ep
> devnm
&& *ep
== 0)
1003 return makedev(MD_MAJOR
, mnr
);
1008 char *get_md_name(char *devnm
)
1010 /* find /dev/md%d or /dev/md/%d or make a device /dev/.tmp.md%d */
1011 /* if dev < 0, want /dev/md/d%d or find mdp in /proc/devices ... */
1013 static char devname
[50];
1015 dev_t rdev
= devnm2devid(devnm
);
1020 if (strncmp(devnm
, "md_", 3) == 0) {
1021 snprintf(devname
, sizeof(devname
), "/dev/md/%s",
1023 if (stat(devname
, &stb
) == 0 &&
1024 (S_IFMT
&stb
.st_mode
) == S_IFBLK
&& (stb
.st_rdev
== rdev
))
1027 snprintf(devname
, sizeof(devname
), "/dev/%s", devnm
);
1028 if (stat(devname
, &stb
) == 0 && (S_IFMT
&stb
.st_mode
) == S_IFBLK
&&
1029 (stb
.st_rdev
== rdev
))
1032 snprintf(devname
, sizeof(devname
), "/dev/md/%s", devnm
+2);
1033 if (stat(devname
, &stb
) == 0 && (S_IFMT
&stb
.st_mode
) == S_IFBLK
&&
1034 (stb
.st_rdev
== rdev
))
1037 dn
= map_dev(major(rdev
), minor(rdev
), 0);
1040 snprintf(devname
, sizeof(devname
), "/dev/.tmp.%s", devnm
);
1041 if (mknod(devname
, S_IFBLK
| 0600, rdev
) == -1)
1042 if (errno
!= EEXIST
)
1045 if (stat(devname
, &stb
) == 0 && (S_IFMT
&stb
.st_mode
) == S_IFBLK
&&
1046 (stb
.st_rdev
== rdev
))
1052 void put_md_name(char *name
)
1054 if (strncmp(name
, "/dev/.tmp.md", 12) == 0)
1058 int get_maj_min(char *dev
, int *major
, int *minor
)
1061 *major
= strtoul(dev
, &e
, 0);
1062 return (e
> dev
&& *e
== ':' && e
[1] &&
1063 (*minor
= strtoul(e
+1, &e
, 0)) >= 0 &&
1067 int dev_open(char *dev
, int flags
)
1069 /* like 'open', but if 'dev' matches %d:%d, create a temp
1070 * block device and open that
1081 if (get_maj_min(dev
, &major
, &minor
)) {
1082 snprintf(devname
, sizeof(devname
), "/dev/.tmp.md.%d:%d:%d",
1083 (int)getpid(), major
, minor
);
1084 if (mknod(devname
, S_IFBLK
|0600, makedev(major
, minor
)) == 0) {
1085 fd
= open(devname
, flags
);
1089 /* Try /tmp as /dev appear to be read-only */
1090 snprintf(devname
, sizeof(devname
),
1091 "/tmp/.tmp.md.%d:%d:%d",
1092 (int)getpid(), major
, minor
);
1093 if (mknod(devname
, S_IFBLK
|0600,
1094 makedev(major
, minor
)) == 0) {
1095 fd
= open(devname
, flags
);
1100 fd
= open(dev
, flags
);
1104 int open_dev_flags(char *devnm
, int flags
)
1109 devid
= devnm2devid(devnm
);
1110 sprintf(buf
, "%d:%d", major(devid
), minor(devid
));
1111 return dev_open(buf
, flags
);
1114 int open_dev(char *devnm
)
1116 return open_dev_flags(devnm
, O_RDONLY
);
1119 int open_dev_excl(char *devnm
)
1124 dev_t devid
= devnm2devid(devnm
);
1127 sprintf(buf
, "%d:%d", major(devid
), minor(devid
));
1128 for (i
= 0; i
< 25; i
++) {
1129 int fd
= dev_open(buf
, flags
|O_EXCL
);
1132 if (errno
== EACCES
&& flags
== O_RDWR
) {
1145 int same_dev(char *one
, char *two
)
1147 struct stat st1
, st2
;
1148 if (stat(one
, &st1
) != 0)
1150 if (stat(two
, &st2
) != 0)
1152 if ((st1
.st_mode
& S_IFMT
) != S_IFBLK
)
1154 if ((st2
.st_mode
& S_IFMT
) != S_IFBLK
)
1156 return st1
.st_rdev
== st2
.st_rdev
;
1159 void wait_for(char *dev
, int fd
)
1162 struct stat stb_want
;
1165 if (fstat(fd
, &stb_want
) != 0 ||
1166 (stb_want
.st_mode
& S_IFMT
) != S_IFBLK
)
1169 for (i
= 0; i
< 25; i
++) {
1171 if (stat(dev
, &stb
) == 0 &&
1172 (stb
.st_mode
& S_IFMT
) == S_IFBLK
&&
1173 (stb
.st_rdev
== stb_want
.st_rdev
))
1180 pr_err("timeout waiting for %s\n", dev
);
1183 struct superswitch
*superlist
[] =
1186 &super_ddf
, &super_imsm
,
1191 struct supertype
*super_by_fd(int fd
, char **subarrayp
)
1193 mdu_array_info_t array
;
1196 struct supertype
*st
= NULL
;
1201 char *subarray
= NULL
;
1202 char container
[32] = "";
1204 sra
= sysfs_read(fd
, NULL
, GET_VERSION
);
1207 vers
= sra
->array
.major_version
;
1208 minor
= sra
->array
.minor_version
;
1209 verstr
= sra
->text_version
;
1211 if (md_get_array_info(fd
, &array
))
1212 array
.major_version
= array
.minor_version
= 0;
1213 vers
= array
.major_version
;
1214 minor
= array
.minor_version
;
1219 sprintf(version
, "%d.%d", vers
, minor
);
1222 if (minor
== -2 && is_subarray(verstr
)) {
1223 char *dev
= verstr
+1;
1225 subarray
= strchr(dev
, '/');
1228 subarray
= xstrdup(subarray
);
1230 strcpy(container
, dev
);
1232 sra
= sysfs_read(-1, container
, GET_VERSION
);
1233 if (sra
&& sra
->text_version
[0])
1234 verstr
= sra
->text_version
;
1236 verstr
= "-no-metadata-";
1239 for (i
= 0; st
== NULL
&& superlist
[i
]; i
++)
1240 st
= superlist
[i
]->match_metadata_desc(verstr
);
1246 *subarrayp
= subarray
;
1247 strcpy(st
->container_devnm
, container
);
1248 strcpy(st
->devnm
, fd2devnm(fd
));
1255 int dev_size_from_id(dev_t id
, unsigned long long *size
)
1260 sprintf(buf
, "%d:%d", major(id
), minor(id
));
1261 fd
= dev_open(buf
, O_RDONLY
);
1264 if (get_dev_size(fd
, NULL
, size
)) {
1272 int dev_sector_size_from_id(dev_t id
, unsigned int *size
)
1277 sprintf(buf
, "%d:%d", major(id
), minor(id
));
1278 fd
= dev_open(buf
, O_RDONLY
);
1281 if (get_dev_sector_size(fd
, NULL
, size
)) {
1289 struct supertype
*dup_super(struct supertype
*orig
)
1291 struct supertype
*st
;
1295 st
= xcalloc(1, sizeof(*st
));
1297 st
->max_devs
= orig
->max_devs
;
1298 st
->minor_version
= orig
->minor_version
;
1299 st
->ignore_hw_compat
= orig
->ignore_hw_compat
;
1300 st
->data_offset
= orig
->data_offset
;
1306 struct supertype
*guess_super_type(int fd
, enum guess_types guess_type
)
1308 /* try each load_super to find the best match,
1309 * and return the best superswitch
1311 struct superswitch
*ss
;
1312 struct supertype
*st
;
1313 unsigned int besttime
= 0;
1317 st
= xcalloc(1, sizeof(*st
));
1318 st
->container_devnm
[0] = 0;
1320 for (i
= 0; superlist
[i
]; i
++) {
1323 if (guess_type
== guess_array
&& ss
->add_to_super
== NULL
)
1325 if (guess_type
== guess_partitions
&& ss
->add_to_super
!= NULL
)
1327 memset(st
, 0, sizeof(*st
));
1328 st
->ignore_hw_compat
= 1;
1329 rv
= ss
->load_super(st
, fd
, NULL
);
1332 st
->ss
->getinfo_super(st
, &info
, NULL
);
1333 if (bestsuper
== -1 ||
1334 besttime
< info
.array
.ctime
) {
1336 besttime
= info
.array
.ctime
;
1341 if (bestsuper
!= -1) {
1343 memset(st
, 0, sizeof(*st
));
1344 st
->ignore_hw_compat
= 1;
1345 rv
= superlist
[bestsuper
]->load_super(st
, fd
, NULL
);
1347 superlist
[bestsuper
]->free_super(st
);
1355 /* Return size of device in bytes */
1356 int get_dev_size(int fd
, char *dname
, unsigned long long *sizep
)
1358 unsigned long long ldsize
;
1361 if (fstat(fd
, &st
) != -1 && S_ISREG(st
.st_mode
))
1362 ldsize
= (unsigned long long)st
.st_size
;
1365 if (ioctl(fd
, BLKGETSIZE64
, &ldsize
) != 0)
1368 unsigned long dsize
;
1369 if (ioctl(fd
, BLKGETSIZE
, &dsize
) == 0) {
1374 pr_err("Cannot get size of %s: %s\n",
1375 dname
, strerror(errno
));
1383 /* Return sector size of device in bytes */
1384 int get_dev_sector_size(int fd
, char *dname
, unsigned int *sectsizep
)
1386 unsigned int sectsize
;
1388 if (ioctl(fd
, BLKSSZGET
, §size
) != 0) {
1390 pr_err("Cannot get sector size of %s: %s\n",
1391 dname
, strerror(errno
));
1395 *sectsizep
= sectsize
;
1399 /* Return true if this can only be a container, not a member device.
1400 * i.e. is and md device and size is zero
1402 int must_be_container(int fd
)
1405 unsigned long long size
;
1407 mdi
= sysfs_read(fd
, NULL
, GET_VERSION
);
1412 if (get_dev_size(fd
, NULL
, &size
) == 0)
1419 /* Sets endofpart parameter to the last block used by the last GPT partition on the device.
1420 * Returns: 1 if successful
1421 * -1 for unknown partition type
1422 * 0 for other errors
1424 static int get_gpt_last_partition_end(int fd
, unsigned long long *endofpart
)
1427 unsigned char empty_gpt_entry
[16]= {0};
1428 struct GPT_part_entry
*part
;
1430 unsigned long long curr_part_end
;
1431 unsigned all_partitions
, entry_size
;
1433 unsigned int sector_size
= 0;
1437 BUILD_BUG_ON(sizeof(gpt
) != 512);
1438 /* skip protective MBR */
1439 if (!get_dev_sector_size(fd
, NULL
, §or_size
))
1441 lseek(fd
, sector_size
, SEEK_SET
);
1442 /* read GPT header */
1443 if (read(fd
, &gpt
, 512) != 512)
1446 /* get the number of partition entries and the entry size */
1447 all_partitions
= __le32_to_cpu(gpt
.part_cnt
);
1448 entry_size
= __le32_to_cpu(gpt
.part_size
);
1450 /* Check GPT signature*/
1451 if (gpt
.magic
!= GPT_SIGNATURE_MAGIC
)
1455 if (all_partitions
> 1024 ||
1456 entry_size
> sizeof(buf
))
1459 part
= (struct GPT_part_entry
*)buf
;
1461 /* set offset to third block (GPT entries) */
1462 lseek(fd
, sector_size
*2, SEEK_SET
);
1463 for (part_nr
= 0; part_nr
< all_partitions
; part_nr
++) {
1464 /* read partition entry */
1465 if (read(fd
, buf
, entry_size
) != (ssize_t
)entry_size
)
1468 /* is this valid partition? */
1469 if (memcmp(part
->type_guid
, empty_gpt_entry
, 16) != 0) {
1470 /* check the last lba for the current partition */
1471 curr_part_end
= __le64_to_cpu(part
->ending_lba
);
1472 if (curr_part_end
> *endofpart
)
1473 *endofpart
= curr_part_end
;
1480 /* Sets endofpart parameter to the last block used by the last partition on the device.
1481 * Returns: 1 if successful
1482 * -1 for unknown partition type
1483 * 0 for other errors
1485 static int get_last_partition_end(int fd
, unsigned long long *endofpart
)
1487 struct MBR boot_sect
;
1488 unsigned long long curr_part_end
;
1490 unsigned int sector_size
;
1495 BUILD_BUG_ON(sizeof(boot_sect
) != 512);
1498 if (read(fd
, &boot_sect
, 512) != 512)
1501 /* check MBP signature */
1502 if (boot_sect
.magic
== MBR_SIGNATURE_MAGIC
) {
1504 /* found the correct signature */
1506 for (part_nr
= 0; part_nr
< MBR_PARTITIONS
; part_nr
++) {
1508 * Have to make every access through boot_sect rather
1509 * than using a pointer to the partition table (or an
1510 * entry), since the entries are not properly aligned.
1513 /* check for GPT type */
1514 if (boot_sect
.parts
[part_nr
].part_type
==
1515 MBR_GPT_PARTITION_TYPE
) {
1516 retval
= get_gpt_last_partition_end(fd
, endofpart
);
1519 /* check the last used lba for the current partition */
1521 __le32_to_cpu(boot_sect
.parts
[part_nr
].first_sect_lba
) +
1522 __le32_to_cpu(boot_sect
.parts
[part_nr
].blocks_num
);
1523 if (curr_part_end
> *endofpart
)
1524 *endofpart
= curr_part_end
;
1527 /* Unknown partition table */
1530 /* calculate number of 512-byte blocks */
1531 if (get_dev_sector_size(fd
, NULL
, §or_size
))
1532 *endofpart
*= (sector_size
/ 512);
1537 int check_partitions(int fd
, char *dname
, unsigned long long freesize
,
1538 unsigned long long size
)
1541 * Check where the last partition ends
1543 unsigned long long endofpart
;
1545 if (get_last_partition_end(fd
, &endofpart
) > 0) {
1546 /* There appears to be a partition table here */
1547 if (freesize
== 0) {
1548 /* partitions will not be visible in new device */
1549 pr_err("partition table exists on %s but will be lost or\n"
1550 " meaningless after creating array\n",
1553 } else if (endofpart
> freesize
) {
1554 /* last partition overlaps metadata */
1555 pr_err("metadata will over-write last partition on %s.\n",
1558 } else if (size
&& endofpart
> size
) {
1559 /* partitions will be truncated in new device */
1560 pr_err("array size is too small to cover all partitions on %s.\n",
1568 int open_container(int fd
)
1570 /* 'fd' is a block device. Find out if it is in use
1571 * by a container, and return an open fd on that container.
1582 if (fstat(fd
, &st
) != 0)
1584 sprintf(path
, "/sys/dev/block/%d:%d/holders",
1585 (int)major(st
.st_rdev
), (int)minor(st
.st_rdev
));
1586 e
= path
+ strlen(path
);
1588 dir
= opendir(path
);
1591 while ((de
= readdir(dir
))) {
1594 if (de
->d_name
[0] == '.')
1596 /* Need to make sure it is a container and not a volume */
1597 sprintf(e
, "/%s/md/metadata_version", de
->d_name
);
1598 dfd
= open(path
, O_RDONLY
);
1601 n
= read(dfd
, buf
, sizeof(buf
));
1603 if (n
<= 0 || (unsigned)n
>= sizeof(buf
))
1606 if (strncmp(buf
, "external", 8) != 0 ||
1610 sprintf(e
, "/%s/dev", de
->d_name
);
1611 dfd
= open(path
, O_RDONLY
);
1614 n
= read(dfd
, buf
, sizeof(buf
));
1616 if (n
<= 0 || (unsigned)n
>= sizeof(buf
))
1619 if (sscanf(buf
, "%d:%d", &major
, &minor
) != 2)
1621 sprintf(buf
, "%d:%d", major
, minor
);
1622 dfd
= dev_open(buf
, O_RDONLY
);
1632 struct superswitch
*version_to_superswitch(char *vers
)
1636 for (i
= 0; superlist
[i
]; i
++) {
1637 struct superswitch
*ss
= superlist
[i
];
1639 if (strcmp(vers
, ss
->name
) == 0)
1646 int metadata_container_matches(char *metadata
, char *devnm
)
1648 /* Check if 'devnm' is the container named in 'metadata'
1650 * /containername/componentname or
1651 * -containername/componentname
1654 if (*metadata
!= '/' && *metadata
!= '-')
1657 if (strncmp(metadata
+1, devnm
, l
) != 0)
1659 if (metadata
[l
+1] != '/')
1664 int metadata_subdev_matches(char *metadata
, char *devnm
)
1666 /* Check if 'devnm' is the subdev named in 'metadata'
1668 * /containername/subdev or
1669 * -containername/subdev
1672 if (*metadata
!= '/' && *metadata
!= '-')
1674 sl
= strchr(metadata
+1, '/');
1677 if (strcmp(sl
+1, devnm
) == 0)
1682 int is_container_member(struct mdstat_ent
*mdstat
, char *container
)
1684 if (mdstat
->metadata_version
== NULL
||
1685 strncmp(mdstat
->metadata_version
, "external:", 9) != 0 ||
1686 !metadata_container_matches(mdstat
->metadata_version
+9, container
))
1692 int is_subarray_active(char *subarray
, char *container
)
1694 struct mdstat_ent
*mdstat
= mdstat_read(0, 0);
1695 struct mdstat_ent
*ent
;
1697 for (ent
= mdstat
; ent
; ent
= ent
->next
)
1698 if (is_container_member(ent
, container
))
1699 if (strcmp(to_subarray(ent
, container
), subarray
) == 0)
1702 free_mdstat(mdstat
);
1707 /* open_subarray - opens a subarray in a container
1708 * @dev: container device name
1709 * @st: empty supertype
1710 * @quiet: block reporting errors flag
1712 * On success returns an fd to a container and fills in *st
1714 int open_subarray(char *dev
, char *subarray
, struct supertype
*st
, int quiet
)
1717 struct mdinfo
*info
;
1721 fd
= open(dev
, O_RDWR
|O_EXCL
);
1724 pr_err("Couldn't open %s, aborting\n",
1729 _devnm
= fd2devnm(fd
);
1730 if (_devnm
== NULL
) {
1732 pr_err("Failed to determine device number for %s\n",
1736 strcpy(st
->devnm
, _devnm
);
1738 mdi
= sysfs_read(fd
, st
->devnm
, GET_VERSION
|GET_LEVEL
);
1741 pr_err("Failed to read sysfs for %s\n",
1746 if (mdi
->array
.level
!= UnSet
) {
1748 pr_err("%s is not a container\n", dev
);
1752 st
->ss
= version_to_superswitch(mdi
->text_version
);
1755 pr_err("Operation not supported for %s metadata\n",
1760 if (st
->devnm
[0] == 0) {
1762 pr_err("Failed to allocate device name\n");
1766 if (!st
->ss
->load_container
) {
1768 pr_err("%s is not a container\n", dev
);
1772 if (st
->ss
->load_container(st
, fd
, NULL
)) {
1774 pr_err("Failed to load metadata for %s\n",
1779 info
= st
->ss
->container_content(st
, subarray
);
1782 pr_err("Failed to find subarray-%s in %s\n",
1792 st
->ss
->free_super(st
);
1805 int add_disk(int mdfd
, struct supertype
*st
,
1806 struct mdinfo
*sra
, struct mdinfo
*info
)
1808 /* Add a device to an array, in one of 2 ways. */
1811 if (st
->ss
->external
) {
1812 if (info
->disk
.state
& (1<<MD_DISK_SYNC
))
1813 info
->recovery_start
= MaxSector
;
1815 info
->recovery_start
= 0;
1816 rv
= sysfs_add_disk(sra
, info
, 0);
1819 for (sd2
= sra
->devs
; sd2
; sd2
=sd2
->next
)
1823 sd2
= xmalloc(sizeof(*sd2
));
1825 sd2
->next
= sra
->devs
;
1830 rv
= ioctl(mdfd
, ADD_NEW_DISK
, &info
->disk
);
1834 int remove_disk(int mdfd
, struct supertype
*st
,
1835 struct mdinfo
*sra
, struct mdinfo
*info
)
1839 /* Remove the disk given by 'info' from the array */
1840 if (st
->ss
->external
)
1841 rv
= sysfs_set_str(sra
, info
, "slot", "none");
1843 rv
= ioctl(mdfd
, HOT_REMOVE_DISK
, makedev(info
->disk
.major
,
1848 int hot_remove_disk(int mdfd
, unsigned long dev
, int force
)
1850 int cnt
= force
? 500 : 5;
1853 /* HOT_REMOVE_DISK can fail with EBUSY if there are
1854 * outstanding IO requests to the device.
1855 * In this case, it can be helpful to wait a little while,
1856 * up to 5 seconds if 'force' is set, or 50 msec if not.
1858 while ((ret
= ioctl(mdfd
, HOT_REMOVE_DISK
, dev
)) == -1 &&
1866 int sys_hot_remove_disk(int statefd
, int force
)
1868 int cnt
= force
? 500 : 5;
1871 while ((ret
= write(statefd
, "remove", 6)) == -1 &&
1875 return ret
== 6 ? 0 : -1;
1878 int set_array_info(int mdfd
, struct supertype
*st
, struct mdinfo
*info
)
1880 /* Initialise kernel's knowledge of array.
1881 * This varies between externally managed arrays
1884 mdu_array_info_t inf
;
1887 if (st
->ss
->external
)
1888 return sysfs_set_array(info
, 9003);
1890 memset(&inf
, 0, sizeof(inf
));
1891 inf
.major_version
= info
->array
.major_version
;
1892 inf
.minor_version
= info
->array
.minor_version
;
1893 rv
= md_set_array_info(mdfd
, &inf
);
1898 unsigned long long min_recovery_start(struct mdinfo
*array
)
1900 /* find the minimum recovery_start in an array for metadata
1901 * formats that only record per-array recovery progress instead
1904 unsigned long long recovery_start
= MaxSector
;
1907 for (d
= array
->devs
; d
; d
= d
->next
)
1908 recovery_start
= min(recovery_start
, d
->recovery_start
);
1910 return recovery_start
;
1913 int mdmon_pid(char *devnm
)
1920 sprintf(path
, "%s/%s.pid", MDMON_DIR
, devnm
);
1922 fd
= open(path
, O_RDONLY
| O_NOATIME
, 0);
1926 n
= read(fd
, pid
, 9);
1933 int mdmon_running(char *devnm
)
1935 int pid
= mdmon_pid(devnm
);
1938 if (kill(pid
, 0) == 0)
1943 int start_mdmon(char *devnm
)
1957 if (check_env("MDADM_NO_MDMON"))
1960 len
= readlink("/proc/self/exe", pathbuf
, sizeof(pathbuf
)-1);
1964 sl
= strrchr(pathbuf
, '/');
1969 strcpy(sl
, "mdmon");
1973 /* First try to run systemctl */
1974 if (!check_env("MDADM_NO_SYSTEMCTL"))
1977 /* FIXME yuk. CLOSE_EXEC?? */
1979 for (i
= 3; skipped
< 20; i
++)
1985 /* Don't want to see error messages from
1986 * systemctl. If the service doesn't exist,
1987 * we start mdmon ourselves.
1990 open("/dev/null", O_WRONLY
);
1991 snprintf(pathbuf
, sizeof(pathbuf
), "mdmon@%s.service",
1993 status
= execl("/usr/bin/systemctl", "systemctl",
1996 status
= execl("/bin/systemctl", "systemctl", "start",
1999 case -1: pr_err("cannot run mdmon. Array remains readonly\n");
2001 default: /* parent - good */
2002 pid
= wait(&status
);
2003 if (pid
>= 0 && status
== 0)
2007 /* That failed, try running mdmon directly */
2010 /* FIXME yuk. CLOSE_EXEC?? */
2012 for (i
= 3; skipped
< 20; i
++)
2018 for (i
= 0; paths
[i
]; i
++)
2020 execl(paths
[i
], paths
[i
],
2024 case -1: pr_err("cannot run mdmon. Array remains readonly\n");
2026 default: /* parent - good */
2027 pid
= wait(&status
);
2028 if (pid
< 0 || status
!= 0) {
2029 pr_err("failed to launch mdmon. Array remains readonly\n");
2036 __u32
random32(void)
2039 int rfd
= open("/dev/urandom", O_RDONLY
);
2040 if (rfd
< 0 || read(rfd
, &rv
, 4) != 4)
2047 void random_uuid(__u8
*buf
)
2052 fd
= open("/dev/urandom", O_RDONLY
);
2055 len
= read(fd
, buf
, 16);
2063 for (i
= 0; i
< 4; i
++)
2068 int flush_metadata_updates(struct supertype
*st
)
2072 st
->update_tail
= NULL
;
2076 sfd
= connect_monitor(st
->container_devnm
);
2080 while (st
->updates
) {
2081 struct metadata_update
*mu
= st
->updates
;
2082 st
->updates
= mu
->next
;
2084 send_message(sfd
, mu
, 0);
2092 st
->update_tail
= NULL
;
2096 void append_metadata_update(struct supertype
*st
, void *buf
, int len
)
2099 struct metadata_update
*mu
= xmalloc(sizeof(*mu
));
2104 mu
->space_list
= NULL
;
2106 *st
->update_tail
= mu
;
2107 st
->update_tail
= &mu
->next
;
2111 /* tinyc doesn't optimize this check in ioctl.h out ... */
2112 unsigned int __invalid_size_argument_for_IOC
= 0;
2115 int experimental(void)
2117 if (check_env("MDADM_EXPERIMENTAL"))
2120 pr_err("To use this feature MDADM_EXPERIMENTAL environment variable has to be defined.\n");
2125 /* Pick all spares matching given criteria from a container
2126 * if min_size == 0 do not check size
2127 * if domlist == NULL do not check domains
2128 * if spare_group given add it to domains of each spare
2129 * metadata allows to test domains using metadata of destination array */
2130 struct mdinfo
*container_choose_spares(struct supertype
*st
,
2131 struct spare_criteria
*criteria
,
2132 struct domainlist
*domlist
,
2134 const char *metadata
, int get_one
)
2136 struct mdinfo
*d
, **dp
, *disks
= NULL
;
2138 /* get list of all disks in container */
2139 if (st
->ss
->getinfo_super_disks
)
2140 disks
= st
->ss
->getinfo_super_disks(st
);
2144 /* find spare devices on the list */
2146 disks
->array
.spare_disks
= 0;
2150 if (d
->disk
.state
== 0) {
2151 /* check if size is acceptable */
2152 unsigned long long dev_size
;
2153 unsigned int dev_sector_size
;
2155 int sector_size_valid
= 0;
2157 dev_t dev
= makedev(d
->disk
.major
,d
->disk
.minor
);
2159 if (!criteria
->min_size
||
2160 (dev_size_from_id(dev
, &dev_size
) &&
2161 dev_size
>= criteria
->min_size
))
2164 if (!criteria
->sector_size
||
2165 (dev_sector_size_from_id(dev
, &dev_sector_size
) &&
2166 criteria
->sector_size
== dev_sector_size
))
2167 sector_size_valid
= 1;
2169 found
= size_valid
&& sector_size_valid
;
2171 /* check if domain matches */
2172 if (found
&& domlist
) {
2173 struct dev_policy
*pol
= devid_policy(dev
);
2175 pol_add(&pol
, pol_domain
,
2177 if (domain_test(domlist
, pol
, metadata
) != 1)
2179 dev_policy_free(pol
);
2184 disks
->array
.spare_disks
++;
2198 /* Checks if paths point to the same device
2199 * Returns 0 if they do.
2200 * Returns 1 if they don't.
2201 * Returns -1 if something went wrong,
2202 * e.g. paths are empty or the files
2203 * they point to don't exist */
2204 int compare_paths (char* path1
, char* path2
)
2206 struct stat st1
,st2
;
2208 if (path1
== NULL
|| path2
== NULL
)
2210 if (stat(path1
,&st1
) != 0)
2212 if (stat(path2
,&st2
) != 0)
2214 if ((st1
.st_ino
== st2
.st_ino
) && (st1
.st_dev
== st2
.st_dev
))
2219 /* Make sure we can open as many devices as needed */
2220 void enable_fds(int devices
)
2222 unsigned int fds
= 20 + devices
;
2224 if (getrlimit(RLIMIT_NOFILE
, &lim
) != 0 || lim
.rlim_cur
>= fds
)
2226 if (lim
.rlim_max
< fds
)
2229 setrlimit(RLIMIT_NOFILE
, &lim
);
2234 /* This is based on similar function in systemd. */
2236 /* statfs.f_type is signed long on s390x and MIPS, causing all
2237 sorts of sign extension problems with RAMFS_MAGIC being
2238 defined as 0x858458f6 */
2239 return statfs("/", &s
) >= 0 &&
2240 ((unsigned long)s
.f_type
== TMPFS_MAGIC
||
2241 ((unsigned long)s
.f_type
& 0xFFFFFFFFUL
) ==
2242 ((unsigned long)RAMFS_MAGIC
& 0xFFFFFFFFUL
));
2245 void reopen_mddev(int mdfd
)
2247 /* Re-open without any O_EXCL, but keep
2252 devnm
= fd2devnm(mdfd
);
2254 fd
= open_dev(devnm
);
2255 if (fd
>= 0 && fd
!= mdfd
)
2259 static struct cmap_hooks
*cmap_hooks
= NULL
;
2260 static int is_cmap_hooks_ready
= 0;
2262 void set_cmap_hooks(void)
2264 cmap_hooks
= xmalloc(sizeof(struct cmap_hooks
));
2265 cmap_hooks
->cmap_handle
= dlopen("libcmap.so.4", RTLD_NOW
| RTLD_LOCAL
);
2266 if (!cmap_hooks
->cmap_handle
)
2269 cmap_hooks
->initialize
=
2270 dlsym(cmap_hooks
->cmap_handle
, "cmap_initialize");
2271 cmap_hooks
->get_string
=
2272 dlsym(cmap_hooks
->cmap_handle
, "cmap_get_string");
2273 cmap_hooks
->finalize
= dlsym(cmap_hooks
->cmap_handle
, "cmap_finalize");
2275 if (!cmap_hooks
->initialize
|| !cmap_hooks
->get_string
||
2276 !cmap_hooks
->finalize
)
2277 dlclose(cmap_hooks
->cmap_handle
);
2279 is_cmap_hooks_ready
= 1;
2282 int get_cluster_name(char **cluster_name
)
2285 cmap_handle_t handle
;
2287 if (!is_cmap_hooks_ready
)
2290 rv
= cmap_hooks
->initialize(&handle
);
2294 rv
= cmap_hooks
->get_string(handle
, "totem.cluster_name", cluster_name
);
2296 free(*cluster_name
);
2303 cmap_hooks
->finalize(handle
);
2308 void set_dlm_hooks(void)
2310 dlm_hooks
= xmalloc(sizeof(struct dlm_hooks
));
2311 dlm_hooks
->dlm_handle
= dlopen("libdlm_lt.so.3", RTLD_NOW
| RTLD_LOCAL
);
2312 if (!dlm_hooks
->dlm_handle
)
2315 dlm_hooks
->create_lockspace
=
2316 dlsym(dlm_hooks
->dlm_handle
, "dlm_create_lockspace");
2317 dlm_hooks
->release_lockspace
=
2318 dlsym(dlm_hooks
->dlm_handle
, "dlm_release_lockspace");
2319 dlm_hooks
->ls_lock
= dlsym(dlm_hooks
->dlm_handle
, "dlm_ls_lock");
2320 dlm_hooks
->ls_unlock
= dlsym(dlm_hooks
->dlm_handle
, "dlm_ls_unlock");
2321 dlm_hooks
->ls_get_fd
= dlsym(dlm_hooks
->dlm_handle
, "dlm_ls_get_fd");
2322 dlm_hooks
->dispatch
= dlsym(dlm_hooks
->dlm_handle
, "dlm_dispatch");
2324 if (!dlm_hooks
->create_lockspace
|| !dlm_hooks
->ls_lock
||
2325 !dlm_hooks
->ls_unlock
|| !dlm_hooks
->release_lockspace
||
2326 !dlm_hooks
->ls_get_fd
|| !dlm_hooks
->dispatch
)
2327 dlclose(dlm_hooks
->dlm_handle
);
2329 is_dlm_hooks_ready
= 1;
2332 void set_hooks(void)