+ /*
+ * Create a new raid array.
+ *
+ * First check that necessary details are available
+ * (i.e. level, raid-disks)
+ *
+ * Then check each disk to see what might be on it
+ * and report anything interesting.
+ *
+ * If anything looks odd, and runstop not set,
+ * abort.
+ *
+ * SET_ARRAY_INFO and ADD_NEW_DISK, and
+ * if runstop==run, or raiddisks diskswere used,
+ * RUN_ARRAY
+ */
+ unsigned long minsize=0, maxsize=0;
+ char *mindisc = NULL;
+ char *maxdisc = NULL;
+ int dnum;
+ mddev_dev_t dv;
+ int fail=0, warn=0;
+ struct stat stb;
+ int first_missing = MD_SB_DISKS*2;
+ int missing_disks = 0;
+ int insert_point = MD_SB_DISKS*2; /* where to insert a missing drive */
+ mddev_dev_t moved_disk = NULL; /* the disk that was moved out of the insert point */
+
+ mdu_array_info_t array;
+
+
+ if (md_get_version(mdfd) < 9000) {
+ fprintf(stderr, Name ": Create requires md driver version 0.90.0 or later\n");
+ return 1;
+ }
+ if (level == UnSet) {
+ fprintf(stderr,
+ Name ": a RAID level is needed to create an array.\n");
+ return 1;
+ }
+ if (raiddisks < 1) {
+ fprintf(stderr,
+ Name ": a number of --raid-devices must be given to create an array\n");
+ return 1;
+ }
+ if (raiddisks < 4 && level == 6) {
+ fprintf(stderr,
+ Name ": at least 4 raid-devices needed for level 6\n");
+ return 1;
+ }
+ if (raiddisks > 256 && level == 6) {
+ fprintf(stderr,
+ Name ": no more than 256 raid-devices supported for level 6\n");
+ return 1;
+ }
+ if (raiddisks < 2 && level >= 4) {
+ fprintf(stderr,
+ Name ": at least 2 raid-devices needed for level 4 or 5\n");
+ return 1;
+ }
+ if (raiddisks+sparedisks > MD_SB_DISKS) {
+ fprintf(stderr,
+ Name ": too many devices requested: %d+%d > %d\n",
+ raiddisks, sparedisks, MD_SB_DISKS);
+ return 1;
+ }
+ if (subdevs > raiddisks+sparedisks) {
+ fprintf(stderr, Name ": You have listed more devices (%d) than are in the array(%d)!\n", subdevs, raiddisks+sparedisks);
+ return 1;
+ }
+ if (subdevs < raiddisks+sparedisks) {
+ fprintf(stderr, Name ": You haven't given enough devices (real or missing) to create this array\n");
+ return 1;
+ }
+
+ /* now set some defaults */
+ if (layout == UnSet)
+ switch(level) {
+ default: /* no layout */
+ layout = 0;
+ break;
+ case 5:
+ case 6:
+ layout = map_name(r5layout, "default");
+ if (verbose)
+ fprintf(stderr,
+ Name ": layout defaults to %s\n", map_num(r5layout, layout));
+ break;
+ }
+
+ switch(level) {
+ case 4:
+ case 5:
+ case 6:
+ case 0:
+ case -1: /* linear */
+ if (chunk == 0) {
+ chunk = 64;
+ if (verbose)
+ fprintf(stderr, Name ": chunk size defaults to 64K\n");
+ }
+ break;
+ default: /* raid1, multipath */
+ if (chunk) {
+ chunk = 0;
+ if (verbose)
+ fprintf(stderr, Name ": chunk size ignored for this level\n");
+ }
+ break;
+ }
+
+ /* now look at the subdevs */
+ array.active_disks = 0;
+ array.working_disks = 0;
+ dnum = 0;
+ for (dv=devlist; dv; dv=dv->next, dnum++) {
+ char *dname = dv->devname;
+ unsigned long dsize, freesize;
+ int fd;
+ if (strcasecmp(dname, "missing")==0) {
+ if (first_missing > dnum)
+ first_missing = dnum;
+ missing_disks ++;
+ continue;
+ }
+ array.working_disks++;
+ if (dnum < raiddisks)
+ array.active_disks++;
+ fd = open(dname, O_RDONLY, 0);
+ if (fd <0 ) {
+ fprintf(stderr, Name ": Cannot open %s: %s\n",
+ dname, strerror(errno));
+ fail=1;
+ continue;
+ }
+ if (ioctl(fd, BLKGETSIZE, &dsize)) {
+ fprintf(stderr, Name ": Cannot get size of %s: %s\n",
+ dname, strerror(errno));
+ fail = 1;
+ close(fd);
+ continue;
+ }
+ if (dsize < MD_RESERVED_SECTORS*2) {
+ fprintf(stderr, Name ": %s is too small: %luK\n",
+ dname, dsize/2);
+ fail = 1;
+ close(fd);
+ continue;
+ }
+ freesize = MD_NEW_SIZE_SECTORS(dsize);
+ freesize /= 2;
+
+ if (size && freesize < size) {
+ fprintf(stderr, Name ": %s is smaller that given size."
+ " %luK < %luK + superblock\n", dname, freesize, size);
+ fail = 1;
+ close(fd);
+ continue;
+ }
+ if (maxdisc == NULL || (maxdisc && freesize > maxsize)) {
+ maxdisc = dname;
+ maxsize = freesize;
+ }
+ if (mindisc ==NULL || (mindisc && freesize < minsize)) {
+ mindisc = dname;
+ minsize = freesize;
+ }
+ warn |= check_ext2(fd, dname);
+ warn |= check_reiser(fd, dname);
+ warn |= check_raid(fd, dname);
+ close(fd);
+ }
+ if (fail) {
+ fprintf(stderr, Name ": create aborted\n");
+ return 1;
+ }
+ if (size == 0) {
+ if (mindisc == NULL) {
+ fprintf(stderr, Name ": no size and no drives given - aborting create.\n");
+ return 1;
+ }
+ size = minsize;
+ if (verbose && level>0)
+ fprintf(stderr, Name ": size set to %luK\n", size);
+ }
+ if (level >= 1 && ((maxsize-size)*100 > maxsize)) {
+ fprintf(stderr, Name ": largest drive (%s) exceed size (%luK) by more than 1%%\n",
+ maxdisc, size);
+ warn = 1;
+ }
+
+ if (warn) {
+ if (runstop!= 1) {
+ if (!ask("Continue creating array? ")) {
+ fprintf(stderr, Name ": create aborted.\n");
+ return 1;
+ }
+ } else {
+ if (verbose)
+ fprintf(stderr, Name ": creation continuing despite oddities due to --run\n");
+ }
+ }
+
+ /* If this is raid5, we want to configure the last active slot
+ * as missing, so that a reconstruct happens (faster than re-parity)
+ * FIX: Can we do this for raid6 as well?
+ */
+ if (force == 0 && first_missing >= raiddisks) {
+ switch ( level ) {
+ case 5:
+ insert_point = raiddisks-1;
+ sparedisks++;
+ array.active_disks--;
+ missing_disks++;
+ break;
+ default:
+ break;
+ }
+ }
+
+ /* Ok, lets try some ioctls */
+
+ array.level = level;
+ array.size = size;
+ array.raid_disks = raiddisks;
+ /* The kernel should *know* what md_minor we are dealing
+ * with, but it chooses to trust me instead. Sigh
+ */
+ array.md_minor = 0;
+ if (fstat(mdfd, &stb)==0)
+ array.md_minor = MINOR(stb.st_rdev);
+ array.not_persistent = 0;
+ /*** FIX: Need to do something about RAID-6 here ***/
+ if ( (level == 5 || level == 6) &&
+ (insert_point < raiddisks || first_missing < raiddisks) )
+ array.state = 1; /* clean, but one+ drive will be missing */
+ else
+ array.state = 0; /* not clean, but no errors */
+
+ /* There is lots of redundancy in these disk counts,
+ * raid_disks is the most meaningful value
+ * it describes the geometry of the array
+ * it is constant
+ * nr_disks is total number of used slots.
+ * it should be raid_disks+spare_disks
+ * spare_disks is the number of extra disks present
+ * see above
+ * active_disks is the number of working disks in
+ * active slots. (With raid_disks)
+ * working_disks is the total number of working disks,
+ * including spares
+ * failed_disks is the number of disks marked failed
+ *
+ * Ideally, the kernel would keep these (except raid_disks)
+ * up-to-date as we ADD_NEW_DISK, but it doesn't (yet).
+ * So for now, we assume that all raid and spare
+ * devices will be given.
+ */
+ array.spare_disks=sparedisks;
+ array.failed_disks=missing_disks;
+ array.nr_disks = array.working_disks + array.failed_disks;
+ array.layout = layout;
+ 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;
+ }
+
+ for (dnum=0, dv = devlist ; dv ; dv=(dv->next)?(dv->next):moved_disk, dnum++) {
+ int fd;
+ struct stat stb;
+ mdu_disk_info_t disk;
+
+ disk.number = dnum;
+ if (dnum == insert_point) {
+ moved_disk = dv;
+ }
+ disk.raid_disk = disk.number;
+ if (disk.raid_disk < raiddisks)
+ disk.state = 6; /* active and in sync */
+ else
+ disk.state = 0;
+ if (dnum == insert_point ||
+ strcasecmp(dv->devname, "missing")==0) {
+ disk.major = 0;
+ disk.minor = 0;
+ disk.state = 1; /* faulty */
+ } else {
+ fd = open(dv->devname, O_RDONLY, 0);
+ if (fd < 0) {
+ fprintf(stderr, Name ": failed to open %s after earlier success - aborting\n",
+ dv->devname);
+ return 1;
+ }
+ fstat(fd, &stb);
+ disk.major = MAJOR(stb.st_rdev);
+ disk.minor = MINOR(stb.st_rdev);
+ close(fd);
+ }
+ if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
+ fprintf(stderr, Name ": ADD_NEW_DISK for %s failed: %s\n",
+ dv->devname, strerror(errno));
+ return 1;
+ }
+ if (dv == moved_disk && dnum != insert_point) break;
+ }
+
+ /* param is not actually used */
+ if (runstop == 1 || subdevs >= raiddisks) {
+ mdu_param_t param;
+ if (ioctl(mdfd, RUN_ARRAY, ¶m)) {
+ fprintf(stderr, Name ": RUN_ARRAY failed: %s\n",
+ strerror(errno));
+ Manage_runstop(mddev, mdfd, -1);
+ return 1;
+ }
+ fprintf(stderr, Name ": array %s started.\n", mddev);
+ } else {
+ fprintf(stderr, Name ": not starting array - not enough devices.\n");
+ }
+ return 0;
projects / thirdparty / mdadm.git / blobdiff