dfd4d8ee42
Currently this includes --write-behind to set level of write-behind supported --write-mostly to flag devices as write-mostly. Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
277 lines
7.4 KiB
C
277 lines
7.4 KiB
C
/*
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* mdadm - manage Linux "md" devices aka RAID arrays.
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*
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* Copyright (C) 2001-2004 Neil Brown <neilb@cse.unsw.edu.au>
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*
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*
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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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*
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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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*
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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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*
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* Author: Neil Brown
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* Email: <neilb@cse.unsw.edu.au>
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* Paper: Neil Brown
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* School of Computer Science and Engineering
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* The University of New South Wales
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* Sydney, 2052
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* Australia
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*/
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#include "mdadm.h"
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#include "dlink.h"
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#if ! defined(__BIG_ENDIAN) && ! defined(__LITTLE_ENDIAN)
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#error no endian defined
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#endif
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#include "md_u.h"
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#include "md_p.h"
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int Grow_Add_device(char *devname, int fd, char *newdev)
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{
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/* Add a device to an active array.
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* Currently, just extend a linear array.
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* This requires writing a new superblock on the
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* new device, calling the kernel to add the device,
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* and if that succeeds, update the superblock on
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* all other devices.
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* This means that we need to *find* all other devices.
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*/
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struct mdinfo info;
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void *super = NULL;
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struct stat stb;
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int nfd, fd2;
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int d, nd;
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struct supertype *st = NULL;
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if (ioctl(fd, GET_ARRAY_INFO, &info.array) < 0) {
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fprintf(stderr, Name ": cannot get array info for %s\n", devname);
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return 1;
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}
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st = super_by_version(info.array.major_version, info.array.minor_version);
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if (!st) {
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fprintf(stderr, Name ": cannot handle arrays with superblock version %d\n", info.array.major_version);
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return 1;
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}
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if (info.array.level != -1) {
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fprintf(stderr, Name ": can only add devices to linear arrays\n");
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return 1;
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}
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nfd = open(newdev, O_RDWR|O_EXCL);
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if (nfd < 0) {
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fprintf(stderr, Name ": cannot open %s\n", newdev);
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return 1;
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}
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fstat(nfd, &stb);
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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", newdev);
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close(nfd);
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return 1;
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}
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/* now check out all the devices and make sure we can read the superblock */
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for (d=0 ; d < info.array.raid_disks ; d++) {
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mdu_disk_info_t disk;
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char *dv;
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disk.number = d;
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if (ioctl(fd, GET_DISK_INFO, &disk) < 0) {
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fprintf(stderr, Name ": cannot get device detail for device %d\n",
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d);
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return 1;
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}
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dv = map_dev(disk.major, disk.minor);
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if (!dv) {
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fprintf(stderr, Name ": cannot find device file for device %d\n",
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d);
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return 1;
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}
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fd2 = open(dv, O_RDWR);
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if (!fd2) {
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fprintf(stderr, Name ": cannot open device file %s\n", dv);
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return 1;
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}
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if (super) free(super);
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super= NULL;
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if (st->ss->load_super(st, fd2, &super, NULL)) {
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fprintf(stderr, Name ": cannot find super block on %s\n", dv);
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close(fd2);
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return 1;
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}
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close(fd2);
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}
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/* Ok, looks good. Lets update the superblock and write it out to
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* newdev.
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*/
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info.disk.number = d;
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info.disk.major = major(stb.st_rdev);
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info.disk.minor = minor(stb.st_rdev);
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info.disk.raid_disk = d;
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info.disk.state = (1 << MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE);
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st->ss->update_super(&info, super, "grow", newdev, 0);
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if (st->ss->store_super(st, nfd, super)) {
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fprintf(stderr, Name ": Cannot store new superblock on %s\n", newdev);
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close(nfd);
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return 1;
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}
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close(nfd);
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if (ioctl(fd, ADD_NEW_DISK, &info.disk) != 0) {
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fprintf(stderr, Name ": Cannot add new disk to this array\n");
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return 1;
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}
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/* Well, that seems to have worked.
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* Now go through and update all superblocks
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*/
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if (ioctl(fd, GET_ARRAY_INFO, &info.array) < 0) {
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fprintf(stderr, Name ": cannot get array info for %s\n", devname);
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return 1;
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}
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nd = d;
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for (d=0 ; d < info.array.raid_disks ; d++) {
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mdu_disk_info_t disk;
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char *dv;
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disk.number = d;
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if (ioctl(fd, GET_DISK_INFO, &disk) < 0) {
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fprintf(stderr, Name ": cannot get device detail for device %d\n",
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d);
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return 1;
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}
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dv = map_dev(disk.major, disk.minor);
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if (!dv) {
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fprintf(stderr, Name ": cannot find device file for device %d\n",
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d);
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return 1;
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}
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fd2 = open(dv, O_RDWR);
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if (fd2 < 0) {
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fprintf(stderr, Name ": cannot open device file %s\n", dv);
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return 1;
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}
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if (st->ss->load_super(st, fd2, &super, NULL)) {
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fprintf(stderr, Name ": cannot find super block on %s\n", dv);
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close(fd);
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return 1;
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}
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info.array.raid_disks = nd+1;
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info.array.nr_disks = nd+1;
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info.array.active_disks = nd+1;
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info.array.working_disks = nd+1;
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info.disk.number = nd;
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info.disk.major = major(stb.st_rdev);
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info.disk.minor = minor(stb.st_rdev);
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info.disk.raid_disk = nd;
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info.disk.state = (1 << MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE);
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st->ss->update_super(&info, super, "grow", dv, 0);
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if (st->ss->store_super(st, fd2, super)) {
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fprintf(stderr, Name ": Cannot store new superblock on %s\n", dv);
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close(fd2);
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return 1;
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}
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close(fd2);
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}
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return 0;
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}
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int Grow_addbitmap(char *devname, int fd, char *file, int chunk, int delay, int write_behind)
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{
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/*
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* First check that array doesn't have a bitmap
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* Then create the bitmap
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* Then add it
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*
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* For internal bitmaps, we need to check the version,
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* find all the active devices, and write the bitmap block
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* to all devices
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*/
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mdu_bitmap_file_t bmf;
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mdu_array_info_t array;
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struct supertype *st;
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if (ioctl(fd, GET_BITMAP_FILE, &bmf) != 0) {
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if (errno == ENOMEM)
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fprintf(stderr, Name ": Memory allocation failure.\n");
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else
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fprintf(stderr, Name ": bitmaps not supported by this kernel.\n");
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return 1;
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}
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if (bmf.pathname[0]) {
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fprintf(stderr, Name ": %s already has a bitmap (%s)\n",
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devname, bmf.pathname);
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return 1;
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}
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if (ioctl(fd, GET_ARRAY_INFO, &array) != 0) {
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fprintf(stderr, Name ": cannot get array status for %s\n", devname);
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return 1;
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}
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if (array.state & (1<<MD_SB_BITMAP_PRESENT)) {
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fprintf(stderr, Name ": Internal bitmap already present on %s\n",
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devname);
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return 1;
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}
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st = super_by_version(array.major_version, array.minor_version);
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if (!st) {
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fprintf(stderr, Name ": Cannot understand version %d.%d\n",
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array.major_version, array.minor_version);
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return 1;
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}
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if (strcmp(file, "internal") == 0) {
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int d;
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for (d=0; d< st->max_devs; d++) {
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mdu_disk_info_t disk;
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char *dv;
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disk.number = d;
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if (ioctl(fd, GET_DISK_INFO, &disk) < 0)
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continue;
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if (disk.major == 0 &&
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disk.minor == 0)
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continue;
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if ((disk.state & (1<<MD_DISK_SYNC))==0)
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continue;
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dv = map_dev(disk.major, disk.minor);
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if (dv) {
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void *super;
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int fd2 = open(dv, O_RDWR);
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if (fd2 < 0)
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continue;
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if (st->ss->load_super(st, fd2, &super, NULL)==0) {
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st->ss->add_internal_bitmap(super,
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chunk, delay, write_behind,
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array.size);
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st->ss->write_bitmap(st, fd2, super);
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}
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close(fd2);
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}
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}
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array.state |= (1<<MD_SB_BITMAP_PRESENT);
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if (ioctl(fd, SET_ARRAY_INFO, &array)!= 0) {
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fprintf(stderr, Name ": failed to set internal bitmap.\n");
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return 1;
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}
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} else
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abort(); /* FIXME */
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return 0;
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}
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