mirror of
https://github.com/kdave/btrfs-progs
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110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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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 GNU
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* 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
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include "kerncompat.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <getopt.h>
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#include <unistd.h>
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#include "kernel-shared/ctree.h"
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#include "kernel-shared/volumes.h"
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#include "kernel-shared/disk-io.h"
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#include "common/help.h"
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#include "common/open-utils.h"
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#include "common/messages.h"
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#include "common/string-utils.h"
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#include "cmds/commands.h"
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static const char * const select_super_usage[] = {
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"btrfs-select-super -s number dev",
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"Overwrite primary superblock by selected copy",
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""
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OPTLINE("-s super", "copy of superblock to overwrite the primary one (values: 1, 2)"),
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NULL
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};
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static const struct cmd_struct select_super_cmd = {
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.usagestr = select_super_usage
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};
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int main(int argc, char **argv)
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{
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struct btrfs_root *root;
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int ret;
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u64 num = 0;
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u64 bytenr = 0;
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while(1) {
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int c;
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c = getopt(argc, argv, "s:");
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if (c < 0)
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break;
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switch(c) {
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case 's':
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num = arg_strtou64(optarg);
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if (num >= BTRFS_SUPER_MIRROR_MAX) {
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error("super mirror should be less than: %d",
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BTRFS_SUPER_MIRROR_MAX);
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exit(1);
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}
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bytenr = btrfs_sb_offset(((int)num));
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break;
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default:
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usage(&select_super_cmd, 1);
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}
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}
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set_argv0(argv);
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if (check_argc_exact(argc - optind, 1))
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return 1;
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if (bytenr == 0) {
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error("please select the super copy with -s");
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usage(&select_super_cmd, 1);
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}
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if((ret = check_mounted(argv[optind])) < 0) {
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errno = -ret;
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error("cannot check mount status: %m");
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return ret;
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} else if(ret) {
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error("%s is currently mounted, aborting", argv[optind]);
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return -EBUSY;
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}
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root = open_ctree(argv[optind], bytenr, 1);
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if (!root) {
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error("open ctree failed");
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return 1;
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}
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/* make the super writing code think we've read the first super */
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root->fs_info->super_bytenr = BTRFS_SUPER_INFO_OFFSET;
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ret = write_all_supers(root->fs_info);
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/* we don't close the ctree or anything, because we don't want a real
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* transaction commit. We just want the super copy we pulled off the
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* disk to overwrite all the other copies
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*/
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printf("using SB copy %llu, bytenr %llu\n", num, bytenr);
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close_ctree(root);
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btrfs_close_all_devices();
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return ret;
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}
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