diff options
Diffstat (limited to '')
| -rw-r--r-- | Build.c | 227 |
1 files changed, 227 insertions, 0 deletions
@@ -0,0 +1,227 @@ +/* + * mdadm - manage Linux "md" devices aka RAID arrays. + * + * Copyright (C) 2001-2009 Neil Brown <neilb@suse.de> + * + * + * 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@suse.de> + */ + +#include "mdadm.h" + +int Build(char *mddev, struct mddev_dev *devlist, + struct shape *s, struct context *c) +{ + /* 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. + */ + int i; + dev_t rdev; + int subdevs = 0, missing_disks = 0; + struct mddev_dev *dv; + int bitmap_fd; + unsigned long long bitmapsize; + int mdfd; + char chosen_name[1024]; + int uuid[4] = {0,0,0,0}; + struct map_ent *map = NULL; + mdu_array_info_t array; + mdu_param_t param; /* not used by syscall */ + + if (s->level == UnSet) { + pr_err("a RAID level is needed to Build an array.\n"); + return 1; + } + /* scan all devices, make sure they really are block devices */ + for (dv = devlist; dv; dv=dv->next) { + subdevs++; + if (strcmp("missing", dv->devname) == 0) { + missing_disks++; + continue; + } + if (!stat_is_blkdev(dv->devname, NULL)) + return 1; + } + + if (s->raiddisks != subdevs) { + pr_err("requested %d devices in array but listed %d\n", + s->raiddisks, subdevs); + return 1; + } + + if (s->layout == UnSet) + switch(s->level) { + default: /* no layout */ + s->layout = 0; + break; + case 10: + s->layout = 0x102; /* near=2, far=1 */ + if (c->verbose > 0) + pr_err("layout defaults to n1\n"); + break; + case 5: + case 6: + s->layout = map_name(r5layout, "default"); + if (c->verbose > 0) + pr_err("layout defaults to %s\n", map_num(r5layout, s->layout)); + break; + case LEVEL_FAULTY: + s->layout = map_name(faultylayout, "default"); + + if (c->verbose > 0) + pr_err("layout defaults to %s\n", map_num(faultylayout, s->layout)); + break; + } + + /* We need to create the device. It can have no name. */ + map_lock(&map); + mdfd = create_mddev(mddev, NULL, c->autof, LOCAL, + chosen_name, 0); + if (mdfd < 0) { + map_unlock(&map); + return 1; + } + mddev = chosen_name; + + map_update(&map, fd2devnm(mdfd), "none", uuid, chosen_name); + map_unlock(&map); + + array.level = s->level; + if (s->size == MAX_SIZE) + s->size = 0; + array.size = s->size; + array.nr_disks = s->raiddisks; + array.raid_disks = s->raiddisks; + array.md_minor = 0; + if (fstat_is_blkdev(mdfd, mddev, &rdev)) + array.md_minor = minor(rdev); + array.not_persistent = 1; + array.state = 0; /* not clean, but no errors */ + if (s->assume_clean) + array.state |= 1; + array.active_disks = s->raiddisks - missing_disks; + array.working_disks = s->raiddisks - missing_disks; + array.spare_disks = 0; + array.failed_disks = missing_disks; + if (s->chunk == 0 && (s->level==0 || s->level==LEVEL_LINEAR)) + s->chunk = 64; + array.chunk_size = s->chunk*1024; + array.layout = s->layout; + if (md_set_array_info(mdfd, &array)) { + pr_err("md_set_array_info() failed for %s: %s\n", + mddev, strerror(errno)); + goto abort; + } + + if (s->bitmap_file && strcmp(s->bitmap_file, "none") == 0) + s->bitmap_file = NULL; + if (s->bitmap_file && s->level <= 0) { + pr_err("bitmaps not meaningful with level %s\n", + map_num(pers, s->level)?:"given"); + goto abort; + } + /* now add the devices */ + for ((i=0), (dv = devlist) ; dv ; i++, dv=dv->next) { + mdu_disk_info_t disk; + unsigned long long dsize; + int fd; + + if (strcmp("missing", dv->devname) == 0) + continue; + if (!stat_is_blkdev(dv->devname, &rdev)) + goto abort; + fd = open(dv->devname, O_RDONLY|O_EXCL); + if (fd < 0) { + pr_err("Cannot open %s: %s\n", + dv->devname, strerror(errno)); + goto abort; + } + if (get_dev_size(fd, NULL, &dsize) && + (s->size == 0 || s->size == MAX_SIZE || dsize < s->size)) + s->size = dsize; + close(fd); + disk.number = i; + disk.raid_disk = i; + disk.state = (1<<MD_DISK_SYNC) | (1<<MD_DISK_ACTIVE); + if (dv->writemostly == FlagSet) + disk.state |= 1<<MD_DISK_WRITEMOSTLY; + disk.major = major(rdev); + disk.minor = minor(rdev); + if (ioctl(mdfd, ADD_NEW_DISK, &disk)) { + pr_err("ADD_NEW_DISK failed for %s: %s\n", + dv->devname, strerror(errno)); + goto abort; + } + } + /* now to start it */ + if (s->bitmap_file) { + bitmap_fd = open(s->bitmap_file, O_RDWR); + if (bitmap_fd < 0) { + int major = BITMAP_MAJOR_HI; +#if 0 + if (s->bitmap_chunk == UnSet) { + pr_err("%s cannot be opened.\n", s->bitmap_file); + goto abort; + } +#endif + bitmapsize = s->size >> 9; /* FIXME wrong for RAID10 */ + if (CreateBitmap(s->bitmap_file, 1, NULL, + s->bitmap_chunk, c->delay, + s->write_behind, bitmapsize, major)) { + goto abort; + } + bitmap_fd = open(s->bitmap_file, O_RDWR); + if (bitmap_fd < 0) { + pr_err("%s cannot be opened.\n", s->bitmap_file); + goto abort; + } + } + if (bitmap_fd >= 0) { + if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) { + pr_err("Cannot set bitmap file for %s: %s\n", + mddev, strerror(errno)); + goto abort; + } + } + } + if (ioctl(mdfd, RUN_ARRAY, ¶m)) { + pr_err("RUN_ARRAY failed: %s\n", strerror(errno)); + if (s->chunk & (s->chunk - 1)) { + cont_err("Problem may be that chunk size is not a power of 2\n"); + } + goto abort; + } + + if (c->verbose >= 0) + pr_err("array %s built and started.\n", + mddev); + wait_for(mddev, mdfd); + close(mdfd); + return 0; + + abort: + ioctl(mdfd, STOP_ARRAY, 0); + close(mdfd); + return 1; +} |