btrfs-progs/btrfs-zero-log.c

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/*
* 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 "kerncompat.h"
#include <stdio.h>
#include <unistd.h>
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
#include "utils.h"
#include "help.h"
__attribute__((noreturn)) static void print_usage(void)
{
printf("usage: btrfs-zero-log dev\n");
exit(1);
}
int main(int argc, char **argv)
{
struct btrfs_root *root;
struct btrfs_trans_handle *trans;
struct btrfs_super_block *sb;
int ret;
set_argv0(argv);
if (check_argc_exact(argc - optind, 1))
print_usage();
radix_tree_init();
printf("WARNING: this utility is deprecated, please use 'btrfs rescue zero-log'\n\n");
if ((ret = check_mounted(argv[optind])) < 0) {
fprintf(stderr, "ERROR: could not check mount status: %s\n", strerror(-ret));
goto out;
} else if (ret) {
fprintf(stderr, "ERROR: %s is currently mounted\n", argv[optind]);
ret = -EBUSY;
goto out;
}
root = open_ctree(argv[optind], 0, OPEN_CTREE_WRITES | OPEN_CTREE_PARTIAL);
if (!root) {
fprintf(stderr, "ERROR: cannot open ctree\n");
return 1;
}
sb = root->fs_info->super_copy;
printf("Clearing log on %s, previous log_root %llu, level %u\n",
argv[optind],
(unsigned long long)btrfs_super_log_root(sb),
(unsigned)btrfs_super_log_root_level(sb));
trans = btrfs_start_transaction(root, 1);
btrfs_set_super_log_root(root->fs_info->super_copy, 0);
btrfs_set_super_log_root_level(root->fs_info->super_copy, 0);
btrfs_commit_transaction(trans, root);
close_ctree(root);
out:
return !!ret;
}