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;
93 static struct dlm_hooks *dlm_hooks = NULL;
94 struct dlm_lock_resource *dlm_lock_res = NULL;
95 static int ast_called = 0;
97 struct dlm_lock_resource {
102 /* Using poll(2) to wait for and dispatch ASTs */
103 static int poll_for_ast(dlm_lshandle_t ls)
107 pfd.fd = dlm_hooks->ls_get_fd(ls);
112 if (poll(&pfd, 1, 0) < 0)
117 dlm_hooks->dispatch(dlm_hooks->ls_get_fd(ls));
124 static void dlm_ast(void *arg)
129 static char *cluster_name = NULL;
130 /* Create the lockspace, take bitmapXXX locks on all the bitmaps. */
131 int cluster_get_dlmlock(int *lockid)
135 int flags = LKF_NOQUEUE;
137 ret = get_cluster_name(&cluster_name);
139 pr_err("The md can't get cluster name\n");
143 dlm_lock_res = xmalloc(sizeof(struct dlm_lock_resource));
144 dlm_lock_res->ls = dlm_hooks->create_lockspace(cluster_name, O_RDWR);
145 if (!dlm_lock_res->ls) {
146 pr_err("%s failed to create lockspace\n", cluster_name);
150 snprintf(str, 64, "bitmap%s", cluster_name);
151 ret = dlm_hooks->ls_lock(dlm_lock_res->ls, LKM_PWMODE, &dlm_lock_res->lksb,
152 flags, str, strlen(str), 0, dlm_ast,
153 dlm_lock_res, NULL, NULL);
155 pr_err("error %d when get PW mode on lock %s\n", errno, str);
156 dlm_hooks->release_lockspace(cluster_name, dlm_lock_res->ls, 1);
160 /* Wait for it to complete */
161 poll_for_ast(dlm_lock_res->ls);
162 *lockid = dlm_lock_res->lksb.sb_lkid;
164 return dlm_lock_res->lksb.sb_status;
167 int cluster_release_dlmlock(int lockid)
174 ret = dlm_hooks->ls_unlock(dlm_lock_res->ls, lockid, 0,
175 &dlm_lock_res->lksb, dlm_lock_res);
177 pr_err("error %d happened when unlock\n", errno);
178 /* XXX make sure the lock is unlocked eventually */
182 /* Wait for it to complete */
183 poll_for_ast(dlm_lock_res->ls);
185 errno = dlm_lock_res->lksb.sb_status;
186 if (errno != EUNLOCK) {
187 pr_err("error %d happened in ast when unlock lockspace\n", errno);
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 cluster_get_dlmlock(int *lockid)
208 int cluster_release_dlmlock(int lockid)
215 * Parse a 128 bit uuid in 4 integers
216 * format is 32 hexx nibbles with options :.<space> separator
217 * If not exactly 32 hex digits are found, return 0
220 int parse_uuid(char *str, int uuid[4])
222 int hit = 0; /* number of Hex digIT */
225 for (i = 0; i < 4; i++)
228 while ((c = *str++) != 0) {
230 if (c >= '0' && c <= '9')
232 else if (c >= 'a' && c <= 'f')
234 else if (c >= 'A' && c <= 'F')
236 else if (strchr(":. -", c))
252 * Get the md version number.
253 * We use the RAID_VERSION ioctl if it is supported
254 * If not, but we have a block device with major '9', we assume
257 * Return version number as 24 but number - assume version parts
261 int md_get_version(int fd)
266 if (fstat(fd, &stb)<0)
268 if ((S_IFMT&stb.st_mode) != S_IFBLK)
271 if (ioctl(fd, RAID_VERSION, &vers) == 0)
272 return (vers.major*10000) + (vers.minor*100) + vers.patchlevel;
275 if (major(stb.st_rdev) == MD_MAJOR)
280 int get_linux_version()
284 int a = 0, b = 0,c = 0;
289 a = strtoul(cp, &cp, 10);
291 b = strtoul(cp+1, &cp, 10);
293 c = strtoul(cp+1, &cp, 10);
295 return (a*1000000)+(b*1000)+c;
299 int mdadm_version(char *version)
307 cp = strchr(version, '-');
308 if (!cp || *(cp+1) != ' ' || *(cp+2) != 'v')
311 a = strtoul(cp, &cp, 10);
314 b = strtoul(cp+1, &cp, 10);
316 c = strtoul(cp+1, &cp, 10);
319 if (*cp != ' ' && *cp != '-')
321 return (a*1000000)+(b*1000)+c;
324 unsigned long long parse_size(char *size)
326 /* parse 'size' which should be a number optionally
327 * followed by 'K', 'M', or 'G'.
328 * Without a suffix, K is assumed.
329 * Number returned is in sectors (half-K)
330 * INVALID_SECTORS returned on error.
333 long long s = strtoll(size, &c, 10);
347 s *= 1024 * 1024 * 2;
349 case 's': /* sectors */
360 int parse_layout_10(char *layout)
364 /* Parse the layout string for raid10 */
365 /* 'f', 'o' or 'n' followed by a number <= raid_disks */
366 if ((layout[0] != 'n' && layout[0] != 'f' && layout[0] != 'o') ||
367 (copies = strtoul(layout+1, &cp, 10)) < 1 ||
371 if (layout[0] == 'n')
373 else if (layout[0] == 'o')
374 rv = 0x10000 + (copies<<8) + 1;
376 rv = 1 + (copies<<8);
380 int parse_layout_faulty(char *layout)
382 /* Parse the layout string for 'faulty' */
383 int ln = strcspn(layout, "0123456789");
384 char *m = xstrdup(layout);
387 mode = map_name(faultylayout, m);
391 return mode | (atoi(layout+ln)<< ModeShift);
394 long parse_num(char *num)
396 /* Either return a valid number, or -1 */
398 long rv = strtol(num, &c, 10);
399 if (rv < 0 || *c || !num[0])
406 int parse_cluster_confirm_arg(char *input, char **devname, int *slot)
409 *slot = strtoul(input, &dev, 10);
410 if (dev == input || dev[0] != ':')
416 void remove_partitions(int fd)
418 /* remove partitions from this block devices.
419 * This is used for components added to an array
421 #ifdef BLKPG_DEL_PARTITION
422 struct blkpg_ioctl_arg a;
423 struct blkpg_partition p;
425 a.op = BLKPG_DEL_PARTITION;
427 a.datalen = sizeof(p);
429 memset(a.data, 0, a.datalen);
430 for (p.pno = 0; p.pno < 16; p.pno++)
431 ioctl(fd, BLKPG, &a);
435 int test_partition(int fd)
437 /* Check if fd is a whole-disk or a partition.
438 * BLKPG will return EINVAL on a partition, and BLKPG_DEL_PARTITION
439 * will return ENXIO on an invalid partition number.
441 struct blkpg_ioctl_arg a;
442 struct blkpg_partition p;
443 a.op = BLKPG_DEL_PARTITION;
445 a.datalen = sizeof(p);
447 memset(a.data, 0, a.datalen);
449 if (ioctl(fd, BLKPG, &a) == 0)
450 /* Very unlikely, but not a partition */
452 if (errno == ENXIO || errno == ENOTTY)
453 /* not a partition */
459 int test_partition_from_id(dev_t id)
464 sprintf(buf, "%d:%d", major(id), minor(id));
465 fd = dev_open(buf, O_RDONLY);
468 rv = test_partition(fd);
473 int enough(int level, int raid_disks, int layout, int clean, char *avail)
479 for (i = 0; i < raid_disks; i++)
480 avail_disks += !!avail[i];
484 /* This is the tricky one - we need to check
485 * which actual disks are present.
487 copies = (layout&255)* ((layout>>8) & 255);
490 /* there must be one of the 'copies' form 'first' */
497 this = (this+1) % raid_disks;
501 first = (first+(layout&255)) % raid_disks;
502 } while (first != 0);
505 case LEVEL_MULTIPATH:
506 return avail_disks>= 1;
509 return avail_disks == raid_disks;
511 return avail_disks >= 1;
513 if (avail_disks == raid_disks - 1 &&
514 !avail[raid_disks - 1])
515 /* If just the parity device is missing, then we
516 * have enough, even if not clean
522 return avail_disks >= raid_disks-1;
524 return avail_disks >= raid_disks;
527 return avail_disks >= raid_disks-2;
529 return avail_disks >= raid_disks;
535 int enough_fd(int fd)
537 struct mdu_array_info_s array;
538 struct mdu_disk_info_s disk;
542 if (ioctl(fd, GET_ARRAY_INFO, &array) != 0 ||
543 array.raid_disks <= 0)
545 avail = xcalloc(array.raid_disks, 1);
546 for (i = 0; i < MAX_DISKS && array.nr_disks > 0; i++) {
548 if (ioctl(fd, GET_DISK_INFO, &disk) != 0)
550 if (disk.major == 0 && disk.minor == 0)
554 if (! (disk.state & (1<<MD_DISK_SYNC)))
556 if (disk.raid_disk < 0 || disk.raid_disk >= array.raid_disks)
558 avail[disk.raid_disk] = 1;
560 /* This is used on an active array, so assume it is clean */
561 rv = enough(array.level, array.raid_disks, array.layout,
567 const int uuid_zero[4] = { 0, 0, 0, 0 };
569 int same_uuid(int a[4], int b[4], int swapuuid)
572 /* parse uuids are hostendian.
573 * uuid's from some superblocks are big-ending
574 * if there is a difference, we need to swap..
576 unsigned char *ac = (unsigned char *)a;
577 unsigned char *bc = (unsigned char *)b;
579 for (i = 0; i < 16; i += 4) {
580 if (ac[i+0] != bc[i+3] ||
581 ac[i+1] != bc[i+2] ||
582 ac[i+2] != bc[i+1] ||
597 void copy_uuid(void *a, int b[4], int swapuuid)
600 /* parse uuids are hostendian.
601 * uuid's from some superblocks are big-ending
602 * if there is a difference, we need to swap..
604 unsigned char *ac = (unsigned char *)a;
605 unsigned char *bc = (unsigned char *)b;
607 for (i = 0; i < 16; i += 4) {
617 char *__fname_from_uuid(int id[4], int swap, char *buf, char sep)
624 copy_uuid(uuid, id, swap);
625 for (i = 0; i < 4; i++) {
628 for (j = 3; j >= 0; j--) {
629 sprintf(c,"%02x", (unsigned char) uuid[j+4*i]);
637 char *fname_from_uuid(struct supertype *st, struct mdinfo *info, char *buf, char sep)
639 // dirty hack to work around an issue with super1 superblocks...
640 // super1 superblocks need swapuuid set in order for assembly to
641 // work, but can't have it set if we want this printout to match
642 // all the other uuid printouts in super1.c, so we force swapuuid
643 // to 1 to make our printout match the rest of super1
644 return __fname_from_uuid(info->uuid, (st->ss == &super1) ? 1 : st->ss->swapuuid, buf, sep);
648 int check_ext2(int fd, char *name)
651 * Check for an ext2fs file system.
652 * Superblock is always 1K at 1K offset
654 * s_magic is le16 at 56 == 0xEF53
655 * report mtime - le32 at 44
657 * logblksize - le32 at 24
659 unsigned char sb[1024];
661 unsigned long long size;
663 if (lseek(fd, 1024,0)!= 1024)
665 if (read(fd, sb, 1024)!= 1024)
667 if (sb[56] != 0x53 || sb[57] != 0xef)
670 mtime = sb[44]|(sb[45]|(sb[46]|sb[47]<<8)<<8)<<8;
671 bsize = sb[24]|(sb[25]|(sb[26]|sb[27]<<8)<<8)<<8;
672 size = sb[4]|(sb[5]|(sb[6]|sb[7]<<8)<<8)<<8;
674 pr_err("%s appears to contain an ext2fs file system\n",
676 cont_err("size=%lluK mtime=%s", size, ctime(&mtime));
680 int check_reiser(int fd, char *name)
683 * superblock is at 64K
685 * Magic string "ReIsErFs" or "ReIsEr2Fs" at 52
688 unsigned char sb[1024];
689 unsigned long long size;
690 if (lseek(fd, 64*1024, 0) != 64*1024)
692 if (read(fd, sb, 1024) != 1024)
694 if (strncmp((char*)sb+52, "ReIsErFs",8) != 0 &&
695 strncmp((char*)sb+52, "ReIsEr2Fs",9) != 0)
697 pr_err("%s appears to contain a reiserfs file system\n",name);
698 size = sb[0]|(sb[1]|(sb[2]|sb[3]<<8)<<8)<<8;
699 cont_err("size = %lluK\n", size*4);
704 int check_raid(int fd, char *name)
709 struct supertype *st = guess_super(fd);
713 st->ss->load_super(st, fd, name);
714 /* Looks like a raid array .. */
715 pr_err("%s appears to be part of a raid array:\n",
717 st->ss->getinfo_super(st, &info, NULL);
718 st->ss->free_super(st);
719 crtime = info.array.ctime;
720 level = map_num(pers, info.array.level);
721 if (!level) level = "-unknown-";
722 cont_err("level=%s devices=%d ctime=%s",
723 level, info.array.raid_disks, ctime(&crtime));
731 for (i = 0; i < 5; i++) {
733 fprintf(stderr, "%s%s", mesg, add);
735 if (fgets(buf, 100, stdin)==NULL)
737 if (buf[0]=='y' || buf[0]=='Y')
739 if (buf[0]=='n' || buf[0]=='N')
743 pr_err("assuming 'no'\n");
746 #endif /* MDASSEMBLE */
748 int is_standard(char *dev, int *nump)
750 /* tests if dev is a "standard" md dev name.
751 * i.e if the last component is "/dNN" or "/mdNN",
752 * where NN is a string of digits
753 * Returns 1 if a partitionable standard,
754 * -1 if non-partitonable,
755 * 0 if not a standard name.
757 char *d = strrchr(dev, '/');
762 if (strncmp(d, "/d",2) == 0)
763 d += 2, type = 1; /* /dev/md/dN{pM} */
764 else if (strncmp(d, "/md_d", 5) == 0)
765 d += 5, type = 1; /* /dev/md_dN{pM} */
766 else if (strncmp(d, "/md", 3) == 0)
767 d += 3, type = -1; /* /dev/mdN */
768 else if (d-dev > 3 && strncmp(d-2, "md/", 3) == 0)
769 d += 1, type = -1; /* /dev/md/N */
779 if (nump) *nump = num;
784 unsigned long calc_csum(void *super, int bytes)
786 unsigned long long newcsum = 0;
789 unsigned int *superc = (unsigned int*) super;
791 for(i = 0; i < bytes/4; i++)
792 newcsum += superc[i];
793 csum = (newcsum& 0xffffffff) + (newcsum>>32);
795 /* The in-kernel checksum calculation is always 16bit on
796 * the alpha, though it is 32 bit on i386...
797 * I wonder what it is elsewhere... (it uses an API in
798 * a way that it shouldn't).
800 csum = (csum & 0xffff) + (csum >> 16);
801 csum = (csum & 0xffff) + (csum >> 16);
807 char *human_size(long long bytes)
811 /* We convert bytes to either centi-M{ega,ibi}bytes or
812 * centi-G{igi,ibi}bytes, with appropriate rounding,
813 * and then print 1/100th of those as a decimal.
814 * We allow upto 2048Megabytes before converting to
815 * gigabytes, as that shows more precision and isn't
816 * too large a number.
817 * Terabytes are not yet handled.
820 if (bytes < 5000*1024)
822 else if (bytes < 2*1024LL*1024LL*1024LL) {
823 long cMiB = (bytes * 200LL / (1LL<<20) + 1) / 2;
824 long cMB = (bytes / ( 1000000LL / 200LL ) +1) /2;
825 snprintf(buf, sizeof(buf), " (%ld.%02ld MiB %ld.%02ld MB)",
826 cMiB/100 , cMiB % 100,
829 long cGiB = (bytes * 200LL / (1LL<<30) +1) / 2;
830 long cGB = (bytes / (1000000000LL/200LL ) +1) /2;
831 snprintf(buf, sizeof(buf), " (%ld.%02ld GiB %ld.%02ld GB)",
832 cGiB/100 , cGiB % 100,
838 char *human_size_brief(long long bytes, int prefix)
842 /* We convert bytes to either centi-M{ega,ibi}bytes or
843 * centi-G{igi,ibi}bytes, with appropriate rounding,
844 * and then print 1/100th of those as a decimal.
845 * We allow upto 2048Megabytes before converting to
846 * gigabytes, as that shows more precision and isn't
847 * too large a number.
848 * Terabytes are not yet handled.
850 * If prefix == IEC, we mean prefixes like kibi,mebi,gibi etc.
851 * If prefix == JEDEC, we mean prefixes like kilo,mega,giga etc.
854 if (bytes < 5000*1024)
856 else if (prefix == IEC) {
857 if (bytes < 2*1024LL*1024LL*1024LL) {
858 long cMiB = (bytes * 200LL / (1LL<<20) +1) /2;
859 snprintf(buf, sizeof(buf), "%ld.%02ldMiB",
860 cMiB/100 , cMiB % 100);
862 long cGiB = (bytes * 200LL / (1LL<<30) +1) /2;
863 snprintf(buf, sizeof(buf), "%ld.%02ldGiB",
864 cGiB/100 , cGiB % 100);
867 else if (prefix == JEDEC) {
868 if (bytes < 2*1024LL*1024LL*1024LL) {
869 long cMB = (bytes / ( 1000000LL / 200LL ) +1) /2;
870 snprintf(buf, sizeof(buf), "%ld.%02ldMB",
873 long cGB = (bytes / (1000000000LL/200LL ) +1) /2;
874 snprintf(buf, sizeof(buf), "%ld.%02ldGB",
875 cGB/100 , cGB % 100);
884 void print_r10_layout(int layout)
886 int near = layout & 255;
887 int far = (layout >> 8) & 255;
888 int offset = (layout&0x10000);
892 printf("%s near=%d", sep, near);
896 printf("%s %s=%d", sep, offset?"offset":"far", far);
898 printf("NO REDUNDANCY");
902 unsigned long long calc_array_size(int level, int raid_disks, int layout,
903 int chunksize, unsigned long long devsize)
907 devsize &= ~(unsigned long long)((chunksize>>9)-1);
908 return get_data_disks(level, layout, raid_disks) * devsize;
911 int get_data_disks(int level, int layout, int raid_disks)
915 case 0: data_disks = raid_disks;
917 case 1: data_disks = 1;
920 case 5: data_disks = raid_disks - 1;
922 case 6: data_disks = raid_disks - 2;
924 case 10: data_disks = raid_disks / (layout & 255) / ((layout>>8)&255);
931 dev_t devnm2devid(char *devnm)
933 /* First look in /sys/block/$DEVNM/dev for %d:%d
934 * If that fails, try parsing out a number
941 sprintf(path, "/sys/block/%s/dev", devnm);
942 fd = open(path, O_RDONLY);
945 int n = read(fd, buf, sizeof(buf));
949 if (n > 0 && sscanf(buf, "%d:%d\n", &mjr, &mnr) == 2)
950 return makedev(mjr, mnr);
952 if (strncmp(devnm, "md_d", 4) == 0 &&
954 (mnr = strtoul(devnm+4, &ep, 10)) >= 0 &&
955 ep > devnm && *ep == 0)
956 return makedev(get_mdp_major(), mnr << MdpMinorShift);
958 if (strncmp(devnm, "md", 2) == 0 &&
960 (mnr = strtoul(devnm+2, &ep, 10)) >= 0 &&
961 ep > devnm && *ep == 0)
962 return makedev(MD_MAJOR, mnr);
967 #if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)
968 char *get_md_name(char *devnm)
970 /* find /dev/md%d or /dev/md/%d or make a device /dev/.tmp.md%d */
971 /* if dev < 0, want /dev/md/d%d or find mdp in /proc/devices ... */
973 static char devname[50];
975 dev_t rdev = devnm2devid(devnm);
980 if (strncmp(devnm, "md_", 3) == 0) {
981 snprintf(devname, sizeof(devname), "/dev/md/%s",
983 if (stat(devname, &stb) == 0
984 && (S_IFMT&stb.st_mode) == S_IFBLK
985 && (stb.st_rdev == rdev))
988 snprintf(devname, sizeof(devname), "/dev/%s", devnm);
989 if (stat(devname, &stb) == 0
990 && (S_IFMT&stb.st_mode) == S_IFBLK
991 && (stb.st_rdev == rdev))
994 snprintf(devname, sizeof(devname), "/dev/md/%s", devnm+2);
995 if (stat(devname, &stb) == 0
996 && (S_IFMT&stb.st_mode) == S_IFBLK
997 && (stb.st_rdev == rdev))
1000 dn = map_dev(major(rdev), minor(rdev), 0);
1003 snprintf(devname, sizeof(devname), "/dev/.tmp.%s", devnm);
1004 if (mknod(devname, S_IFBLK | 0600, rdev) == -1)
1005 if (errno != EEXIST)
1008 if (stat(devname, &stb) == 0
1009 && (S_IFMT&stb.st_mode) == S_IFBLK
1010 && (stb.st_rdev == rdev))
1016 void put_md_name(char *name)
1018 if (strncmp(name, "/dev/.tmp.md", 12) == 0)
1021 #endif /* !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) */
1023 int get_maj_min(char *dev, int *major, int *minor)
1026 *major = strtoul(dev, &e, 0);
1027 return (e > dev && *e == ':' && e[1] &&
1028 (*minor = strtoul(e+1, &e, 0)) >= 0 &&
1032 int dev_open(char *dev, int flags)
1034 /* like 'open', but if 'dev' matches %d:%d, create a temp
1035 * block device and open that
1042 if (!dev) return -1;
1045 if (get_maj_min(dev, &major, &minor)) {
1046 snprintf(devname, sizeof(devname), "/dev/.tmp.md.%d:%d:%d",
1047 (int)getpid(), major, minor);
1048 if (mknod(devname, S_IFBLK|0600, makedev(major, minor)) == 0) {
1049 fd = open(devname, flags);
1053 /* Try /tmp as /dev appear to be read-only */
1054 snprintf(devname, sizeof(devname), "/tmp/.tmp.md.%d:%d:%d",
1055 (int)getpid(), major, minor);
1056 if (mknod(devname, S_IFBLK|0600, makedev(major, minor)) == 0) {
1057 fd = open(devname, flags);
1062 fd = open(dev, flags);
1066 int open_dev_flags(char *devnm, int flags)
1071 devid = devnm2devid(devnm);
1072 sprintf(buf, "%d:%d", major(devid), minor(devid));
1073 return dev_open(buf, flags);
1076 int open_dev(char *devnm)
1078 return open_dev_flags(devnm, O_RDONLY);
1081 int open_dev_excl(char *devnm)
1086 dev_t devid = devnm2devid(devnm);
1089 sprintf(buf, "%d:%d", major(devid), minor(devid));
1090 for (i = 0 ; i < 25 ; i++) {
1091 int fd = dev_open(buf, flags|O_EXCL);
1094 if (errno == EACCES && flags == O_RDWR) {
1107 int same_dev(char *one, char *two)
1109 struct stat st1, st2;
1110 if (stat(one, &st1) != 0)
1112 if (stat(two, &st2) != 0)
1114 if ((st1.st_mode & S_IFMT) != S_IFBLK)
1116 if ((st2.st_mode & S_IFMT) != S_IFBLK)
1118 return st1.st_rdev == st2.st_rdev;
1121 void wait_for(char *dev, int fd)
1124 struct stat stb_want;
1127 if (fstat(fd, &stb_want) != 0 ||
1128 (stb_want.st_mode & S_IFMT) != S_IFBLK)
1131 for (i = 0 ; i < 25 ; i++) {
1133 if (stat(dev, &stb) == 0 &&
1134 (stb.st_mode & S_IFMT) == S_IFBLK &&
1135 (stb.st_rdev == stb_want.st_rdev))
1142 dprintf("timeout waiting for %s\n", dev);
1145 struct superswitch *superlist[] =
1148 &super_ddf, &super_imsm,
1152 #if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)
1154 struct supertype *super_by_fd(int fd, char **subarrayp)
1156 mdu_array_info_t array;
1159 struct supertype *st = NULL;
1164 char *subarray = NULL;
1165 char container[32] = "";
1167 sra = sysfs_read(fd, NULL, GET_VERSION);
1170 vers = sra->array.major_version;
1171 minor = sra->array.minor_version;
1172 verstr = sra->text_version;
1174 if (ioctl(fd, GET_ARRAY_INFO, &array))
1175 array.major_version = array.minor_version = 0;
1176 vers = array.major_version;
1177 minor = array.minor_version;
1182 sprintf(version, "%d.%d", vers, minor);
1185 if (minor == -2 && is_subarray(verstr)) {
1186 char *dev = verstr+1;
1188 subarray = strchr(dev, '/');
1191 subarray = xstrdup(subarray);
1193 strcpy(container, dev);
1195 sra = sysfs_read(-1, container, GET_VERSION);
1196 if (sra && sra->text_version[0])
1197 verstr = sra->text_version;
1199 verstr = "-no-metadata-";
1202 for (i = 0; st == NULL && superlist[i] ; i++)
1203 st = superlist[i]->match_metadata_desc(verstr);
1209 *subarrayp = subarray;
1210 strcpy(st->container_devnm, container);
1211 strcpy(st->devnm, fd2devnm(fd));
1217 #endif /* !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) */
1219 int dev_size_from_id(dev_t id, unsigned long long *size)
1224 sprintf(buf, "%d:%d", major(id), minor(id));
1225 fd = dev_open(buf, O_RDONLY);
1228 if (get_dev_size(fd, NULL, size)) {
1236 struct supertype *dup_super(struct supertype *orig)
1238 struct supertype *st;
1242 st = xcalloc(1, sizeof(*st));
1244 st->max_devs = orig->max_devs;
1245 st->minor_version = orig->minor_version;
1246 st->ignore_hw_compat = orig->ignore_hw_compat;
1247 st->data_offset = orig->data_offset;
1253 struct supertype *guess_super_type(int fd, enum guess_types guess_type)
1255 /* try each load_super to find the best match,
1256 * and return the best superswitch
1258 struct superswitch *ss;
1259 struct supertype *st;
1260 unsigned int besttime = 0;
1264 st = xcalloc(1, sizeof(*st));
1265 st->container_devnm[0] = 0;
1267 for (i = 0 ; superlist[i]; i++) {
1270 if (guess_type == guess_array && ss->add_to_super == NULL)
1272 if (guess_type == guess_partitions && ss->add_to_super != NULL)
1274 memset(st, 0, sizeof(*st));
1275 st->ignore_hw_compat = 1;
1276 rv = ss->load_super(st, fd, NULL);
1279 st->ss->getinfo_super(st, &info, NULL);
1280 if (bestsuper == -1 ||
1281 besttime < info.array.ctime) {
1283 besttime = info.array.ctime;
1288 if (bestsuper != -1) {
1290 memset(st, 0, sizeof(*st));
1291 st->ignore_hw_compat = 1;
1292 rv = superlist[bestsuper]->load_super(st, fd, NULL);
1294 superlist[bestsuper]->free_super(st);
1302 /* Return size of device in bytes */
1303 int get_dev_size(int fd, char *dname, unsigned long long *sizep)
1305 unsigned long long ldsize;
1308 if (fstat(fd, &st) != -1 && S_ISREG(st.st_mode))
1309 ldsize = (unsigned long long)st.st_size;
1312 if (ioctl(fd, BLKGETSIZE64, &ldsize) != 0)
1315 unsigned long dsize;
1316 if (ioctl(fd, BLKGETSIZE, &dsize) == 0) {
1321 pr_err("Cannot get size of %s: %s\b",
1322 dname, strerror(errno));
1330 /* Return true if this can only be a container, not a member device.
1331 * i.e. is and md device and size is zero
1333 int must_be_container(int fd)
1335 unsigned long long size;
1336 if (md_get_version(fd) < 0)
1338 if (get_dev_size(fd, NULL, &size) == 0)
1345 /* Sets endofpart parameter to the last block used by the last GPT partition on the device.
1346 * Returns: 1 if successful
1347 * -1 for unknown partition type
1348 * 0 for other errors
1350 static int get_gpt_last_partition_end(int fd, unsigned long long *endofpart)
1353 unsigned char empty_gpt_entry[16]= {0};
1354 struct GPT_part_entry *part;
1356 unsigned long long curr_part_end;
1357 unsigned all_partitions, entry_size;
1362 BUILD_BUG_ON(sizeof(gpt) != 512);
1363 /* skip protective MBR */
1364 lseek(fd, 512, SEEK_SET);
1365 /* read GPT header */
1366 if (read(fd, &gpt, 512) != 512)
1369 /* get the number of partition entries and the entry size */
1370 all_partitions = __le32_to_cpu(gpt.part_cnt);
1371 entry_size = __le32_to_cpu(gpt.part_size);
1373 /* Check GPT signature*/
1374 if (gpt.magic != GPT_SIGNATURE_MAGIC)
1378 if (all_partitions > 1024 ||
1379 entry_size > sizeof(buf))
1382 part = (struct GPT_part_entry *)buf;
1384 for (part_nr = 0; part_nr < all_partitions; part_nr++) {
1385 /* read partition entry */
1386 if (read(fd, buf, entry_size) != (ssize_t)entry_size)
1389 /* is this valid partition? */
1390 if (memcmp(part->type_guid, empty_gpt_entry, 16) != 0) {
1391 /* check the last lba for the current partition */
1392 curr_part_end = __le64_to_cpu(part->ending_lba);
1393 if (curr_part_end > *endofpart)
1394 *endofpart = curr_part_end;
1401 /* Sets endofpart parameter to the last block used by the last partition on the device.
1402 * Returns: 1 if successful
1403 * -1 for unknown partition type
1404 * 0 for other errors
1406 static int get_last_partition_end(int fd, unsigned long long *endofpart)
1408 struct MBR boot_sect;
1409 struct MBR_part_record *part;
1410 unsigned long long curr_part_end;
1416 BUILD_BUG_ON(sizeof(boot_sect) != 512);
1419 if (read(fd, &boot_sect, 512) != 512)
1422 /* check MBP signature */
1423 if (boot_sect.magic == MBR_SIGNATURE_MAGIC) {
1425 /* found the correct signature */
1426 part = boot_sect.parts;
1428 for (part_nr = 0; part_nr < MBR_PARTITIONS; part_nr++) {
1429 /* check for GPT type */
1430 if (part->part_type == MBR_GPT_PARTITION_TYPE) {
1431 retval = get_gpt_last_partition_end(fd, endofpart);
1434 /* check the last used lba for the current partition */
1435 curr_part_end = __le32_to_cpu(part->first_sect_lba) +
1436 __le32_to_cpu(part->blocks_num);
1437 if (curr_part_end > *endofpart)
1438 *endofpart = curr_part_end;
1443 /* Unknown partition table */
1450 int check_partitions(int fd, char *dname, unsigned long long freesize,
1451 unsigned long long size)
1454 * Check where the last partition ends
1456 unsigned long long endofpart;
1459 if ((ret = get_last_partition_end(fd, &endofpart)) > 0) {
1460 /* There appears to be a partition table here */
1461 if (freesize == 0) {
1462 /* partitions will not be visible in new device */
1463 pr_err("partition table exists on %s but will be lost or\n"
1464 " meaningless after creating array\n",
1467 } else if (endofpart > freesize) {
1468 /* last partition overlaps metadata */
1469 pr_err("metadata will over-write last partition on %s.\n",
1472 } else if (size && endofpart > size) {
1473 /* partitions will be truncated in new device */
1474 pr_err("array size is too small to cover all partitions on %s.\n",
1482 int open_container(int fd)
1484 /* 'fd' is a block device. Find out if it is in use
1485 * by a container, and return an open fd on that container.
1496 if (fstat(fd, &st) != 0)
1498 sprintf(path, "/sys/dev/block/%d:%d/holders",
1499 (int)major(st.st_rdev), (int)minor(st.st_rdev));
1500 e = path + strlen(path);
1502 dir = opendir(path);
1505 while ((de = readdir(dir))) {
1508 if (de->d_name[0] == '.')
1510 /* Need to make sure it is a container and not a volume */
1511 sprintf(e, "/%s/md/metadata_version", de->d_name);
1512 dfd = open(path, O_RDONLY);
1515 n = read(dfd, buf, sizeof(buf));
1517 if (n <= 0 || (unsigned)n >= sizeof(buf))
1520 if (strncmp(buf, "external", 8) != 0 ||
1524 sprintf(e, "/%s/dev", de->d_name);
1525 dfd = open(path, O_RDONLY);
1528 n = read(dfd, buf, sizeof(buf));
1530 if (n <= 0 || (unsigned)n >= sizeof(buf))
1533 if (sscanf(buf, "%d:%d", &major, &minor) != 2)
1535 sprintf(buf, "%d:%d", major, minor);
1536 dfd = dev_open(buf, O_RDONLY);
1546 struct superswitch *version_to_superswitch(char *vers)
1550 for (i = 0; superlist[i]; i++) {
1551 struct superswitch *ss = superlist[i];
1553 if (strcmp(vers, ss->name) == 0)
1560 int metadata_container_matches(char *metadata, char *devnm)
1562 /* Check if 'devnm' is the container named in 'metadata'
1564 * /containername/componentname or
1565 * -containername/componentname
1568 if (*metadata != '/' && *metadata != '-')
1571 if (strncmp(metadata+1, devnm, l) != 0)
1573 if (metadata[l+1] != '/')
1578 int metadata_subdev_matches(char *metadata, char *devnm)
1580 /* Check if 'devnm' is the subdev named in 'metadata'
1582 * /containername/subdev or
1583 * -containername/subdev
1586 if (*metadata != '/' && *metadata != '-')
1588 sl = strchr(metadata+1, '/');
1591 if (strcmp(sl+1, devnm) == 0)
1596 int is_container_member(struct mdstat_ent *mdstat, char *container)
1598 if (mdstat->metadata_version == NULL ||
1599 strncmp(mdstat->metadata_version, "external:", 9) != 0 ||
1600 !metadata_container_matches(mdstat->metadata_version+9, container))
1606 int is_subarray_active(char *subarray, char *container)
1608 struct mdstat_ent *mdstat = mdstat_read(0, 0);
1609 struct mdstat_ent *ent;
1611 for (ent = mdstat; ent; ent = ent->next)
1612 if (is_container_member(ent, container))
1613 if (strcmp(to_subarray(ent, container), subarray) == 0)
1616 free_mdstat(mdstat);
1621 /* open_subarray - opens a subarray in a container
1622 * @dev: container device name
1623 * @st: empty supertype
1624 * @quiet: block reporting errors flag
1626 * On success returns an fd to a container and fills in *st
1628 int open_subarray(char *dev, char *subarray, struct supertype *st, int quiet)
1631 struct mdinfo *info;
1635 fd = open(dev, O_RDWR|O_EXCL);
1638 pr_err("Couldn't open %s, aborting\n",
1643 _devnm = fd2devnm(fd);
1644 if (_devnm == NULL) {
1646 pr_err("Failed to determine device number for %s\n",
1650 strcpy(st->devnm, _devnm);
1652 mdi = sysfs_read(fd, st->devnm, GET_VERSION|GET_LEVEL);
1655 pr_err("Failed to read sysfs for %s\n",
1660 if (mdi->array.level != UnSet) {
1662 pr_err("%s is not a container\n", dev);
1666 st->ss = version_to_superswitch(mdi->text_version);
1669 pr_err("Operation not supported for %s metadata\n",
1674 if (st->devnm[0] == 0) {
1676 pr_err("Failed to allocate device name\n");
1680 if (!st->ss->load_container) {
1682 pr_err("%s is not a container\n", dev);
1686 if (st->ss->load_container(st, fd, NULL)) {
1688 pr_err("Failed to load metadata for %s\n",
1693 info = st->ss->container_content(st, subarray);
1696 pr_err("Failed to find subarray-%s in %s\n",
1706 st->ss->free_super(st);
1719 int add_disk(int mdfd, struct supertype *st,
1720 struct mdinfo *sra, struct mdinfo *info)
1722 /* Add a device to an array, in one of 2 ways. */
1725 if (st->ss->external) {
1726 if (info->disk.state & (1<<MD_DISK_SYNC))
1727 info->recovery_start = MaxSector;
1729 info->recovery_start = 0;
1730 rv = sysfs_add_disk(sra, info, 0);
1733 for (sd2 = sra->devs; sd2; sd2=sd2->next)
1737 sd2 = xmalloc(sizeof(*sd2));
1739 sd2->next = sra->devs;
1745 rv = ioctl(mdfd, ADD_NEW_DISK, &info->disk);
1749 int remove_disk(int mdfd, struct supertype *st,
1750 struct mdinfo *sra, struct mdinfo *info)
1753 /* Remove the disk given by 'info' from the array */
1755 if (st->ss->external)
1756 rv = sysfs_set_str(sra, info, "slot", "none");
1759 rv = ioctl(mdfd, HOT_REMOVE_DISK, makedev(info->disk.major,
1764 int set_array_info(int mdfd, struct supertype *st, struct mdinfo *info)
1766 /* Initialise kernel's knowledge of array.
1767 * This varies between externally managed arrays
1770 int vers = md_get_version(mdfd);
1774 if (st->ss->external)
1775 rv = sysfs_set_array(info, vers);
1778 if ((vers % 100) >= 1) { /* can use different versions */
1779 mdu_array_info_t inf;
1780 memset(&inf, 0, sizeof(inf));
1781 inf.major_version = info->array.major_version;
1782 inf.minor_version = info->array.minor_version;
1783 rv = ioctl(mdfd, SET_ARRAY_INFO, &inf);
1785 rv = ioctl(mdfd, SET_ARRAY_INFO, NULL);
1789 unsigned long long min_recovery_start(struct mdinfo *array)
1791 /* find the minimum recovery_start in an array for metadata
1792 * formats that only record per-array recovery progress instead
1795 unsigned long long recovery_start = MaxSector;
1798 for (d = array->devs; d; d = d->next)
1799 recovery_start = min(recovery_start, d->recovery_start);
1801 return recovery_start;
1804 int mdmon_pid(char *devnm)
1811 sprintf(path, "%s/%s.pid", MDMON_DIR, devnm);
1813 fd = open(path, O_RDONLY | O_NOATIME, 0);
1817 n = read(fd, pid, 9);
1824 int mdmon_running(char *devnm)
1826 int pid = mdmon_pid(devnm);
1829 if (kill(pid, 0) == 0)
1834 int start_mdmon(char *devnm)
1848 if (check_env("MDADM_NO_MDMON"))
1851 len = readlink("/proc/self/exe", pathbuf, sizeof(pathbuf)-1);
1855 sl = strrchr(pathbuf, '/');
1860 strcpy(sl, "mdmon");
1864 /* First try to run systemctl */
1865 if (!check_env("MDADM_NO_SYSTEMCTL"))
1868 /* FIXME yuk. CLOSE_EXEC?? */
1870 for (i = 3; skipped < 20; i++)
1876 /* Don't want to see error messages from
1877 * systemctl. If the service doesn't exist,
1878 * we start mdmon ourselves.
1881 open("/dev/null", O_WRONLY);
1882 snprintf(pathbuf, sizeof(pathbuf), "mdmon@%s.service",
1884 status = execl("/usr/bin/systemctl", "systemctl",
1887 status = execl("/bin/systemctl", "systemctl", "start",
1890 case -1: pr_err("cannot run mdmon. Array remains readonly\n");
1892 default: /* parent - good */
1893 pid = wait(&status);
1894 if (pid >= 0 && status == 0)
1898 /* That failed, try running mdmon directly */
1901 /* FIXME yuk. CLOSE_EXEC?? */
1903 for (i = 3; skipped < 20; i++)
1909 for (i = 0; paths[i]; i++)
1911 execl(paths[i], paths[i],
1915 case -1: pr_err("cannot run mdmon. Array remains readonly\n");
1917 default: /* parent - good */
1918 pid = wait(&status);
1919 if (pid < 0 || status != 0) {
1920 pr_err("failed to launch mdmon. Array remains readonly\n");
1927 __u32 random32(void)
1930 int rfd = open("/dev/urandom", O_RDONLY);
1931 if (rfd < 0 || read(rfd, &rv, 4) != 4)
1939 int flush_metadata_updates(struct supertype *st)
1943 st->update_tail = NULL;
1947 sfd = connect_monitor(st->container_devnm);
1951 while (st->updates) {
1952 struct metadata_update *mu = st->updates;
1953 st->updates = mu->next;
1955 send_message(sfd, mu, 0);
1963 st->update_tail = NULL;
1967 void append_metadata_update(struct supertype *st, void *buf, int len)
1970 struct metadata_update *mu = xmalloc(sizeof(*mu));
1975 mu->space_list = NULL;
1977 *st->update_tail = mu;
1978 st->update_tail = &mu->next;
1980 #endif /* MDASSEMBLE */
1983 /* tinyc doesn't optimize this check in ioctl.h out ... */
1984 unsigned int __invalid_size_argument_for_IOC = 0;
1987 int experimental(void)
1989 if (check_env("MDADM_EXPERIMENTAL"))
1992 pr_err("To use this feature MDADM_EXPERIMENTAL environment variable has to be defined.\n");
1997 /* Pick all spares matching given criteria from a container
1998 * if min_size == 0 do not check size
1999 * if domlist == NULL do not check domains
2000 * if spare_group given add it to domains of each spare
2001 * metadata allows to test domains using metadata of destination array */
2002 struct mdinfo *container_choose_spares(struct supertype *st,
2003 unsigned long long min_size,
2004 struct domainlist *domlist,
2006 const char *metadata, int get_one)
2008 struct mdinfo *d, **dp, *disks = NULL;
2010 /* get list of all disks in container */
2011 if (st->ss->getinfo_super_disks)
2012 disks = st->ss->getinfo_super_disks(st);
2016 /* find spare devices on the list */
2018 disks->array.spare_disks = 0;
2022 if (d->disk.state == 0) {
2023 /* check if size is acceptable */
2024 unsigned long long dev_size;
2025 dev_t dev = makedev(d->disk.major,d->disk.minor);
2028 (dev_size_from_id(dev, &dev_size) &&
2029 dev_size >= min_size))
2031 /* check if domain matches */
2032 if (found && domlist) {
2033 struct dev_policy *pol = devid_policy(dev);
2035 pol_add(&pol, pol_domain,
2037 if (domain_test(domlist, pol, metadata) != 1)
2039 dev_policy_free(pol);
2044 disks->array.spare_disks++;
2058 /* Checks if paths point to the same device
2059 * Returns 0 if they do.
2060 * Returns 1 if they don't.
2061 * Returns -1 if something went wrong,
2062 * e.g. paths are empty or the files
2063 * they point to don't exist */
2064 int compare_paths (char* path1, char* path2)
2066 struct stat st1,st2;
2068 if (path1 == NULL || path2 == NULL)
2070 if (stat(path1,&st1) != 0)
2072 if (stat(path2,&st2) != 0)
2074 if ((st1.st_ino == st2.st_ino) && (st1.st_dev == st2.st_dev))
2079 /* Make sure we can open as many devices as needed */
2080 void enable_fds(int devices)
2082 unsigned int fds = 20 + devices;
2084 if (getrlimit(RLIMIT_NOFILE, &lim) != 0
2085 || lim.rlim_cur >= fds)
2087 if (lim.rlim_max < fds)
2090 setrlimit(RLIMIT_NOFILE, &lim);
2095 /* This is based on similar function in systemd. */
2097 /* statfs.f_type is signed long on s390x and MIPS, causing all
2098 sorts of sign extension problems with RAMFS_MAGIC being
2099 defined as 0x858458f6 */
2100 return statfs("/", &s) >= 0 &&
2101 ((unsigned long)s.f_type == TMPFS_MAGIC ||
2102 ((unsigned long)s.f_type & 0xFFFFFFFFUL) ==
2103 ((unsigned long)RAMFS_MAGIC & 0xFFFFFFFFUL));
2106 void reopen_mddev(int mdfd)
2108 /* Re-open without any O_EXCL, but keep
2113 devnm = fd2devnm(mdfd);
2115 fd = open_dev(devnm);
2116 if (fd >= 0 && fd != mdfd)
2121 static struct cmap_hooks *cmap_hooks = NULL;
2122 static int is_cmap_hooks_ready = 0;
2124 void set_cmap_hooks(void)
2126 cmap_hooks = xmalloc(sizeof(struct cmap_hooks));
2127 cmap_hooks->cmap_handle = dlopen("libcmap.so.4", RTLD_NOW | RTLD_LOCAL);
2128 if (!cmap_hooks->cmap_handle)
2131 cmap_hooks->initialize = dlsym(cmap_hooks->cmap_handle, "cmap_initialize");
2132 cmap_hooks->get_string = dlsym(cmap_hooks->cmap_handle, "cmap_get_string");
2133 cmap_hooks->finalize = dlsym(cmap_hooks->cmap_handle, "cmap_finalize");
2135 if (!cmap_hooks->initialize || !cmap_hooks->get_string ||
2136 !cmap_hooks->finalize)
2137 dlclose(cmap_hooks->cmap_handle);
2139 is_cmap_hooks_ready = 1;
2142 int get_cluster_name(char **cluster_name)
2145 cmap_handle_t handle;
2147 if (!is_cmap_hooks_ready)
2150 rv = cmap_hooks->initialize(&handle);
2154 rv = cmap_hooks->get_string(handle, "totem.cluster_name", cluster_name);
2156 free(*cluster_name);
2163 cmap_hooks->finalize(handle);
2168 void set_dlm_hooks(void)
2170 dlm_hooks = xmalloc(sizeof(struct dlm_hooks));
2171 dlm_hooks->dlm_handle = dlopen("libdlm_lt.so.3", RTLD_NOW | RTLD_LOCAL);
2172 if (!dlm_hooks->dlm_handle)
2175 dlm_hooks->create_lockspace = dlsym(dlm_hooks->dlm_handle, "dlm_create_lockspace");
2176 dlm_hooks->release_lockspace = dlsym(dlm_hooks->dlm_handle, "dlm_release_lockspace");
2177 dlm_hooks->ls_lock = dlsym(dlm_hooks->dlm_handle, "dlm_ls_lock");
2178 dlm_hooks->ls_unlock = dlsym(dlm_hooks->dlm_handle, "dlm_ls_unlock");
2179 dlm_hooks->ls_get_fd = dlsym(dlm_hooks->dlm_handle, "dlm_ls_get_fd");
2180 dlm_hooks->dispatch = dlsym(dlm_hooks->dlm_handle, "dlm_dispatch");
2182 if (!dlm_hooks->create_lockspace || !dlm_hooks->ls_lock ||
2183 !dlm_hooks->ls_unlock || !dlm_hooks->release_lockspace ||
2184 !dlm_hooks->ls_get_fd || !dlm_hooks->dispatch)
2185 dlclose(dlm_hooks->dlm_handle);
2187 is_dlm_hooks_ready = 1;
2190 void set_hooks(void)