diff options
Diffstat (limited to 'Build.c')
| -rw-r--r-- | Build.c | 133 |
1 files changed, 133 insertions, 0 deletions
@@ -29,8 +29,141 @@ #include "mdctl.h" +#define REGISTER_DEV _IO (MD_MAJOR, 1) +#define START_MD _IO (MD_MAJOR, 2) +#define STOP_MD _IO (MD_MAJOR, 3) + int Build(char *mddev, int mdfd, int chunk, int level, int raiddisks, int subdevs, char *subdev[]) { + /* Build a linear or raid0 arrays without superblocks + * We cannot really do any checks, we just do it. + * For md_version < 0.90.0, we call REGISTER_DEV + * with the device numbers, and then + * START_MD giving the "geometry" + * geometry is 0xpp00cc + * where pp is personality: 1==linear, 2=raid0 + * cc = chunk size factor: 0==4k, 1==8k etc. + * + * For md_version >= 0.90.0 we call + * SET_ARRAY_INFO, ADD_NEW_DISK, RUN_ARRAY + * + */ + int i; + int vers; + struct stat stb; + if (raiddisks != subdevs) { + fprintf(stderr, Name ": requested %d devices in array but listed %d\n", + raiddisks, subdevs); + return 1; + } + + /* scan all devices, make sure they really are block devices */ + for (i=0; i<subdevs; i++) { + if (stat(subdev[i], &stb)) { + fprintf(stderr, Name ": Cannot find %s: %s\n", + subdev[i], strerror(errno)); + return 1; + } + if ((stb.st_mode & S_IFMT) != S_IFBLK) { + fprintf(stderr, Name ": %s is not a block device.\n", + subdev[i]); + return 1; + } + } + + vers = md_get_version(mdfd); + + /* looks Ok, go for it */ + if (vers >= 90000) { + mdu_array_info_t array; + array.level = level; + array.size = 0; + array.nr_disks = raiddisks; + array.raid_disks = raiddisks; + array.md_minor = 0; + if (fstat(mdfd, &stb)==0) + array.md_minor = MINOR(stb.st_rdev); + array.not_persistent = 0; + array.state = 0; /* not clean, but no errors */ + array.active_disks = raiddisks; + array.working_disks = raiddisks; + array.spare_disks = 0; + array.failed_disks = 0; + array.chunk_size = chunk*1024; + if (ioctl(mdfd, SET_ARRAY_INFO, &array)) { + fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n", + mddev, strerror(errno)); + return 1; + } + } + /* now add the devices */ + for (i=0; i<subdevs; i++) { + if (stat(subdev[i], &stb)) { + fprintf(stderr, Name ": Wierd: %s has disappeared.\n", + subdev[i]); + goto abort; + } + if ((stb.st_rdev & S_IFMT)!= S_IFBLK) { + fprintf(stderr, Name ": Wierd: %s is no longer a block device.\n", + subdev[i]); + goto abort; + } + if (vers> 90000) { + mdu_disk_info_t disk; + disk.number = i; + disk.raid_disk = i; + disk.state = 6; + disk.major = MAJOR(stb.st_rdev); + disk.minor = MINOR(stb.st_rdev); + if (ioctl(mdfd, ADD_NEW_DISK, &disk)) { + fprintf(stderr, Name ": ADD_NEW_DISK failed for %s: %s\n", + subdev[i], strerror(errno)); + goto abort; + } + } else { + if (ioctl(mdfd, REGISTER_DEV, &stb.st_rdev)) { + fprintf(stderr, Name ": REGISTER_DEV failed for %s.\n", + subdev[i], strerror(errno)); + goto abort; + } + } + } + /* now to start it */ + if (vers > 90000) { + mdu_param_t param; /* not used by syscall */ + if (ioctl(mdfd, RUN_ARRAY, param)) { + fprintf(stderr, Name ": RUN_ARRAY failed: %s\n", + strerror(errno)); + goto abort; + } + } else { + int arg; + arg=0; + while (chunk > 4096) { + arg++; + chunk >>= 1; + } + if (level == 0) + chunk |= 0x20000; + else chunk |= 0x10000; + if (ioctl(mdfd, START_MD, arg)) { + fprintf(stderr, Name ": START_MD failed: %s\n", + strerror(errno)); + goto abort; + } + } + fprintf(stderr, Name ": array %s built and started.\n", + mddev); + return 0; + + abort: + if (vers > 900000) + ioctl(mdfd, STOP_ARRAY, 0); + else + ioctl(mdfd, STOP_MD, 0); + return 1; + } + |