diff options
Diffstat (limited to 'util.c')
| -rw-r--r-- | util.c | 95 |
1 files changed, 93 insertions, 2 deletions
@@ -56,8 +56,10 @@ int parse_uuid(char *str, int uuid[4]) continue; else return 0; - uuid[hit/4] <<= 4; - uuid[hit/4] += n; + if (hit<32) { + uuid[hit/8] <<= 4; + uuid[hit/8] += n; + } hit++; } if (hit == 32) @@ -222,6 +224,31 @@ int load_super(int fd, mdp_super_t *super) return 0; } +int store_super(int fd, mdp_super_t *super) +{ + 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 (write(fd, super, sizeof(*super)) != sizeof(*super)) + return 4; + + return 0; +} + + int check_ext2(int fd, char *name) { @@ -333,3 +360,67 @@ int map_name(mapping_t *map, char *name) } return -10; } + +/* + * convert a major/minor pair for a block device into a name in /dev, if possible. + * On the first call, walk /dev collecting name. + * Put them in a simple linked listfor now. + */ +struct devmap { + int major, minor; + char *name; + struct devmap *next; +} *devlist = NULL; +int devlist_ready = 0; + +#define __USE_XOPEN_EXTENDED +#include <ftw.h> + + +int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s) +{ + if ((stb->st_mode&S_IFMT)== S_IFBLK) { + char *n = strdup(name); + struct devmap *dm = malloc(sizeof(*dm)); + if (dm) { + dm->major = MAJOR(stb->st_rdev); + dm->minor = MINOR(stb->st_rdev); + dm->name = n; + dm->next = devlist; + devlist = dm; + } + } + return 0; +} + +char *map_dev(int major, int minor) +{ + struct devmap *p; + if (!devlist_ready) { + nftw("/dev", add_dev, 10, FTW_PHYS); + devlist_ready=1; + } + + for (p=devlist; p; p=p->next) + if (p->major == major && + p->minor == minor) + return p->name; + return NULL; +} + + +int calc_sb_csum(mdp_super_t *super) +{ + unsigned int oldcsum = super->sb_csum; + unsigned long long newcsum = 0; /* FIXME why does this make it work?? */ + unsigned long csum; + int i; + unsigned int *superc = (int*) super; + super->sb_csum = 0; + + for(i=0; i<MD_SB_BYTES/4; i++) + newcsum+= superc[i]; + csum = (newcsum& 0xffffffff) + (newcsum>>32); + super->sb_csum = oldcsum; + return csum; +} |