109 lines
2.7 KiB
C
109 lines
2.7 KiB
C
/*
|
|
* Copyright (C) 2007 Oracle. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public
|
|
* License v2 as published by the Free Software Foundation.
|
|
*
|
|
* 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 021110-1307, USA.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <sys/stat.h>
|
|
#include "kerncompat.h"
|
|
#include "ctree.h"
|
|
#include "volumes.h"
|
|
#include "disk-io.h"
|
|
#include "print-tree.h"
|
|
#include "transaction.h"
|
|
#include "list.h"
|
|
#include "utils.h"
|
|
#include "help.h"
|
|
|
|
static void print_usage(void)
|
|
{
|
|
printf("usage: btrfs-select-super -s number dev\n");
|
|
printf("\t-s super copy of superblock to overwrite the primary one (values: 1, 2)\n");
|
|
exit(1);
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
struct btrfs_root *root;
|
|
int ret;
|
|
u64 num = 0;
|
|
u64 bytenr = 0;
|
|
|
|
while(1) {
|
|
int c;
|
|
c = getopt(argc, argv, "s:");
|
|
if (c < 0)
|
|
break;
|
|
switch(c) {
|
|
case 's':
|
|
num = arg_strtou64(optarg);
|
|
if (num >= BTRFS_SUPER_MIRROR_MAX) {
|
|
fprintf(stderr,
|
|
"ERROR: super mirror should be less than: %d\n",
|
|
BTRFS_SUPER_MIRROR_MAX);
|
|
exit(1);
|
|
}
|
|
bytenr = btrfs_sb_offset(((int)num));
|
|
break;
|
|
default:
|
|
print_usage();
|
|
}
|
|
}
|
|
set_argv0(argv);
|
|
if (check_argc_exact(argc - optind, 1))
|
|
return 1;
|
|
|
|
if (bytenr == 0) {
|
|
fprintf(stderr, "Please select the super copy with -s\n");
|
|
print_usage();
|
|
}
|
|
|
|
radix_tree_init();
|
|
|
|
if((ret = check_mounted(argv[optind])) < 0) {
|
|
errno = -ret;
|
|
error("cannot check mount status: %m");
|
|
return ret;
|
|
} else if(ret) {
|
|
error("%s is currently mounted, aborting", argv[optind]);
|
|
return -EBUSY;
|
|
}
|
|
|
|
root = open_ctree(argv[optind], bytenr, 1);
|
|
|
|
if (!root) {
|
|
fprintf(stderr, "Open ctree failed\n");
|
|
return 1;
|
|
}
|
|
|
|
/* make the super writing code think we've read the first super */
|
|
root->fs_info->super_bytenr = BTRFS_SUPER_INFO_OFFSET;
|
|
ret = write_all_supers(root->fs_info);
|
|
|
|
/* we don't close the ctree or anything, because we don't want a real
|
|
* transaction commit. We just want the super copy we pulled off the
|
|
* disk to overwrite all the other copies
|
|
*/
|
|
printf("using SB copy %llu, bytenr %llu\n", (unsigned long long)num,
|
|
(unsigned long long)bytenr);
|
|
close_ctree(root);
|
|
btrfs_close_all_devices();
|
|
return ret;
|
|
}
|