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* mdadm - manage Linux "md" devices aka RAID arrays.
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* Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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* Email: <neilb@cse.unsw.edu.au>
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* School of Computer Science and Engineering
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* The University of New South Wales
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#define REGISTER_DEV _IO (MD_MAJOR, 1)
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#define START_MD _IO (MD_MAJOR, 2)
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#define STOP_MD _IO (MD_MAJOR, 3)
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int Build(char *mddev, int mdfd, int chunk, int level, int layout,
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mddev_dev_t devlist, int assume_clean)
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/* Build a linear or raid0 arrays without superblocks
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* We cannot really do any checks, we just do it.
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* For md_version < 0.90.0, we call REGISTER_DEV
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* with the device numbers, and then
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* START_MD giving the "geometry"
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* geometry is 0xpp00cc
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* where pp is personality: 1==linear, 2=raid0
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* cc = chunk size factor: 0==4k, 1==8k etc.
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* For md_version >= 0.90.0 we call
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* SET_ARRAY_INFO, ADD_NEW_DISK, RUN_ARRAY
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/* scan all devices, make sure they really are block devices */
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for (dv = devlist; dv; dv=dv->next) {
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if (stat(dv->devname, &stb)) {
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fprintf(stderr, Name ": Cannot find %s: %s\n",
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dv->devname, strerror(errno));
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if ((stb.st_mode & S_IFMT) != S_IFBLK) {
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fprintf(stderr, Name ": %s is not a block device.\n",
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if (raiddisks != subdevs) {
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fprintf(stderr, Name ": requested %d devices in array but listed %d\n",
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default: /* no layout */
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layout = 0x102; /* near=2, far=1 */
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Name ": layout defaults to n1\n");
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layout = map_name(r5layout, "default");
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Name ": layout defaults to %s\n", map_num(r5layout, layout));
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layout = map_name(faultylayout, "default");
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Name ": layout defaults to %s\n", map_num(faultylayout, layout));
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vers = md_get_version(mdfd);
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/* looks Ok, go for it */
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mdu_array_info_t array;
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array.nr_disks = raiddisks;
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array.raid_disks = raiddisks;
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if (fstat(mdfd, &stb)==0)
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array.md_minor = minor(stb.st_rdev);
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array.not_persistent = 1;
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array.state = 0; /* not clean, but no errors */
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array.active_disks = raiddisks;
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array.working_disks = raiddisks;
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array.spare_disks = 0;
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array.failed_disks = 0;
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array.chunk_size = chunk*1024;
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array.layout = layout;
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if (ioctl(mdfd, SET_ARRAY_INFO, &array)) {
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fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
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mddev, strerror(errno));
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/* now add the devices */
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for ((i=0), (dv = devlist) ; dv ; i++, dv=dv->next) {
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if (stat(dv->devname, &stb)) {
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fprintf(stderr, Name ": Wierd: %s has disappeared.\n",
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if ((stb.st_mode & S_IFMT)!= S_IFBLK) {
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fprintf(stderr, Name ": Wierd: %s is no longer a block device.\n",
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mdu_disk_info_t disk;
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disk.major = major(stb.st_rdev);
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disk.minor = minor(stb.st_rdev);
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if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
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fprintf(stderr, Name ": ADD_NEW_DISK failed for %s: %s\n",
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dv->devname, strerror(errno));
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if (ioctl(mdfd, REGISTER_DEV, &stb.st_rdev)) {
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fprintf(stderr, Name ": REGISTER_DEV failed for %s: %s.\n",
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dv->devname, strerror(errno));
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/* now to start it */
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mdu_param_t param; /* not used by syscall */
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if (ioctl(mdfd, RUN_ARRAY, ¶m)) {
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fprintf(stderr, Name ": RUN_ARRAY failed: %s\n",
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while (chunk > 4096) {
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else chunk |= 0x10000;
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if (ioctl(mdfd, START_MD, arg)) {
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fprintf(stderr, Name ": START_MD failed: %s\n",
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fprintf(stderr, Name ": array %s built and started.\n",
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ioctl(mdfd, STOP_ARRAY, 0);
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ioctl(mdfd, STOP_MD, 0);