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/*
* mdadm - manage Linux "md" devices aka RAID arrays.
*
* Copyright (C) 2001-2004 Neil Brown <neilb@cse.unsw.edu.au>
*
*
* 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@cse.unsw.edu.au>
* Paper: Neil Brown
* School of Computer Science and Engineering
* The University of New South Wales
* Sydney, 2052
* Australia
*/
#include "mdadm.h"
#include "dlink.h"
#if ! defined(__BIG_ENDIAN) && ! defined(__LITTLE_ENDIAN)
#error no endian defined
#endif
#include "md_u.h"
#include "md_p.h"
int Grow_Add_device(char *devname, int fd, char *newdev)
{
/* Add a device to an active array.
* Currently, just extend a linear array.
* This requires writing a new superblock on the
* new device, calling the kernel to add the device,
* and if that succeeds, update the superblock on
* all other devices.
* This means that we need to *find* all other devices.
*/
mdu_array_info_t array;
mdu_disk_info_t disk;
mdp_super_t super;
struct stat stb;
int nfd, fd2;
int d, nd;
if (ioctl(fd, GET_ARRAY_INFO, &array) < 0) {
fprintf(stderr, Name ": cannot get array info for %s\n", devname);
return 1;
}
if (array.level != -1) {
fprintf(stderr, Name ": can only add devices to linear arrays\n");
return 1;
}
nfd = open(newdev, O_RDWR|O_EXCL);
if (nfd < 0) {
fprintf(stderr, Name ": cannot open %s\n", newdev);
return 1;
}
fstat(nfd, &stb);
if ((stb.st_mode & S_IFMT) != S_IFBLK) {
fprintf(stderr, Name ": %s is not a block device!\n", newdev);
close(nfd);
return 1;
}
/* now check out all the devices and make sure we can read the superblock */
for (d=0 ; d < array.raid_disks ; d++) {
mdu_disk_info_t disk;
char *dv;
disk.number = d;
if (ioctl(fd, GET_DISK_INFO, &disk) < 0) {
fprintf(stderr, Name ": cannot get device detail for device %d\n",
d);
return 1;
}
dv = map_dev(disk.major, disk.minor);
if (!dv) {
fprintf(stderr, Name ": cannot find device file for device %d\n",
d);
return 1;
}
fd2 = open(dv, O_RDWR);
if (!fd2) {
fprintf(stderr, Name ": cannot open device file %s\n", dv);
return 1;
}
if (load_super(fd2, &super)) {
fprintf(stderr, Name ": cannot find super block on %s\n", dv);
close(fd2);
return 1;
}
close(fd2);
}
/* Ok, looks good. Lets update the superblock and write it out to
* newdev.
*/
memset(&super.disks[d], 0, sizeof(super.disks[d]));
super.disks[d].number = d;
super.disks[d].major = major(stb.st_rdev);
super.disks[d].minor = minor(stb.st_rdev);
super.disks[d].raid_disk = d;
super.disks[d].state = (1 << MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE);
super.this_disk = super.disks[d];
super.sb_csum = calc_sb_csum(&super);
if (store_super(nfd, &super)) {
fprintf(stderr, Name ": Cannot store new superblock on %s\n", newdev);
close(nfd);
return 1;
}
disk.number = d;
disk.major = major(stb.st_rdev);
disk.minor = minor(stb.st_rdev);
disk.raid_disk = d;
disk.state = (1 << MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE);
close(nfd);
if (ioctl(fd, ADD_NEW_DISK, &disk) != 0) {
fprintf(stderr, Name ": Cannot add new disk to this array\n");
return 1;
}
/* Well, that seems to have worked.
* Now go through and update all superblocks
*/
if (ioctl(fd, GET_ARRAY_INFO, &array) < 0) {
fprintf(stderr, Name ": cannot get array info for %s\n", devname);
return 1;
}
nd = d;
for (d=0 ; d < array.raid_disks ; d++) {
mdu_disk_info_t disk;
char *dv;
disk.number = d;
if (ioctl(fd, GET_DISK_INFO, &disk) < 0) {
fprintf(stderr, Name ": cannot get device detail for device %d\n",
d);
return 1;
}
dv = map_dev(disk.major, disk.minor);
if (!dv) {
fprintf(stderr, Name ": cannot find device file for device %d\n",
d);
return 1;
}
fd2 = open(dv, O_RDWR);
if (fd2 < 0) {
fprintf(stderr, Name ": cannot open device file %s\n", dv);
return 1;
}
if (load_super(fd2, &super)) {
fprintf(stderr, Name ": cannot find super block on %s\n", dv);
close(fd);
return 1;
}
super.raid_disks = nd+1;
super.nr_disks = nd+1;
super.active_disks = nd+1;
super.working_disks = nd+1;
memset(&super.disks[nd], 0, sizeof(super.disks[nd]));
super.disks[nd].number = nd;
super.disks[nd].major = major(stb.st_rdev);
super.disks[nd].minor = minor(stb.st_rdev);
super.disks[nd].raid_disk = nd;
super.disks[nd].state = (1 << MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE);
super.this_disk = super.disks[d];
super.sb_csum = calc_sb_csum(&super);
if (store_super(fd2, &super)) {
fprintf(stderr, Name ": Cannot store new superblock on %s\n", dv);
close(fd2);
return 1;
}
close(fd2);
}
return 0;
}
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