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Diffstat (limited to 'util.c')
| -rw-r--r-- | util.c | 224 |
1 files changed, 224 insertions, 0 deletions
@@ -0,0 +1,224 @@ +/* + * mdctl - manage Linux "md" devices aka RAID arrays. + * + * Copyright (C) 2001 Neil Brown <neilb@cse.unsw.edu.au> + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Author: Neil Brown + * Email: <neilb@cse.unsw.edu.au> + * Paper: Neil Brown + * School of Computer Science and Engineering + * The University of New South Wales + * Sydney, 2052 + * Australia + */ + +#include "mdctl.h" +#include "md_p.h" +#include <sys/utsname.h> + +/* + * Parse a 128 bit uuid in 4 integers + * format is 32 hexx nibbles with options :.<space> separator + * If not exactly 32 hex digits are found, return 0 + * else return 1 + */ +int parse_uuid(char *str, int uuid[4]) +{ + int hit = 0; /* number of Hex digIT */ + int i; + char c; + for (i=0; i<4; i++) uuid[i]=0; + + while ((c= *str++)) { + int n; + if (c>='0' && c<='9') + n = c-'0'; + else if (c>='a' && c <= 'f') + n = 10 + c - 'a'; + else if (c>='A' && c <= 'F') + n = 10 + c - 'A'; + else if (strchr(":. -", c)) + continue; + else return 0; + + uuid[hit/4] <<= 4; + uuid[hit/4] += n; + hit++; + } + if (hit == 32) + return 1; + return 0; + +} + + +/* + * Get the md version number. + * We use the RAID_VERSION ioctl if it is supported + * If not, but we have a block device with major '9', we assume + * 0.36.0 + * + * Return version number as 24 but number - assume version parts + * always < 255 + */ + +int md_get_version(int fd) +{ + struct stat stb; + mdu_version_t vers; + + if (fstat(fd, &stb)<0) + return -1; + if ((S_IFMT&stb.st_mode) != S_IFBLK) + return -1; + + if (ioctl(fd, RAID_VERSION, &vers) == 0) + return (vers.major<<16) | (vers.minor<<8) | vers.patchlevel; + + if (MAJOR(stb.st_rdev) == MD_MAJOR) + return (36<<8); + return -1; +} + + +int get_linux_version() +{ + struct utsname name; + int a,b,c; + if (uname(&name) <0) + return -1; + + if (sscanf(name.release, "%d.%d.%d", &a,&b,&c)!= 3) + return -1; + return (a<<16)+(b<<8)+c; +} + +int enough(int level, int raid_disks, int avail_disks) +{ + switch (level) { + case -1: + case 0: + return avail_disks == raid_disks; + case 1: + return avail_disks >= 1; + case 4: + case 5: + return avail_disks >= raid_disks-1; + default: + return 0; + } +} + +int same_uuid(int a[4], int b[4]) +{ + if (a[0]==b[0] && + a[1]==b[1] && + a[2]==b[2] && + a[3]==b[3]) + return 1; + return 0; +} + +void uuid_from_super(int uuid[4], mdp_super_t *super) +{ + uuid[0] = super->set_uuid0; + if (super->minor_version >= 90) { + uuid[1] = super->set_uuid1; + uuid[2] = super->set_uuid2; + uuid[3] = super->set_uuid3; + } else { + uuid[1] = 0; + uuid[2] = 0; + uuid[3] = 0; + } +} + +int compare_super(mdp_super_t *first, mdp_super_t *second) +{ + /* + * return: + * 0 same, or first was empty, and second was copied + * 1 second had wrong number + * 2 wrong uuid + * 3 wrong other info + */ + int uuid1[4], uuid2[4]; + if (second->md_magic != MD_SB_MAGIC) + return 1; + if (first-> md_magic != MD_SB_MAGIC) { + memcpy(first, second, sizeof(*first)); + return 0; + } + + uuid_from_super(uuid1, first); + uuid_from_super(uuid2, second); + if (!same_uuid(uuid1, uuid2)) + return 2; + if (first->major_version != second->major_version || + first->minor_version != second->minor_version || + first->patch_version != second->patch_version || + first->gvalid_words != second->gvalid_words || + first->ctime != second->ctime || + first->level != second->level || + first->size != second->size || + first->raid_disks != second->raid_disks ) + return 3; + + return 0; +} + +int load_super(int fd, mdp_super_t *super) +{ + /* try to read in the superblock + * + * return + * 0 - success + * 1 - no block size + * 2 - too small + * 3 - no seek + * 4 - no read + * 5 - no magic + * 6 - wrong major version + */ + long size; + long long offset; + + if (ioctl(fd, BLKGETSIZE, &size)) + return 1; + + if (size < MD_RESERVED_SECTORS*2) + return 2; + + offset = MD_NEW_SIZE_SECTORS(size); + + offset *= 512; + + if (lseek64(fd, offset, 0)< 0LL) + return 3; + + if (read(fd, &super, sizeof(super)) != sizeof(super)) + return 4; + + if (super->md_magic != MD_SB_MAGIC) + return 5; + + if (super->major_version != 0) + return 6; + return 0; +} + |