btrfs-zero-log.c

   1 /*
   2  * Copyright (C) 2007 Oracle.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public
   6  * License v2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public
  14  * License along with this program; if not, write to the
  15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16  * Boston, MA 021110-1307, USA.
  17  */
  18
  19 #include "kerncompat.h"
  20
  21 #include <stdio.h>
  22 #include <unistd.h>
  23 #include "ctree.h"
  24 #include "disk-io.h"
  25 #include "transaction.h"
  26 #include "utils.h"
  27
  28 __attribute__((noreturn)) static void print_usage(void)
  29 {
  30         printf("usage: btrfs-zero-log dev\n");
  31         exit(1);
  32 }
  33
  34 int main(int argc, char **argv)
  35 {
  36         struct btrfs_root *root;
  37         struct btrfs_trans_handle *trans;
  38         struct btrfs_super_block *sb;
  39         int ret;
  40
  41         set_argv0(argv);
  42         if (check_argc_exact(argc - optind, 1))
  43                 print_usage();
  44
  45         radix_tree_init();
  46
  47         printf("WARNING: this utility is deprecated, please use 'btrfs rescue zero-log'\n\n");
  48
  49         if ((ret = check_mounted(argv[optind])) < 0) {
  50                 fprintf(stderr, "ERROR: could not check mount status: %s\n", strerror(-ret));
  51                 goto out;
  52         } else if (ret) {
  53                 fprintf(stderr, "ERROR: %s is currently mounted\n", argv[optind]);
  54                 ret = -EBUSY;
  55                 goto out;
  56         }
  57
  58         root = open_ctree(argv[optind], 0, OPEN_CTREE_WRITES | OPEN_CTREE_PARTIAL);
  59         if (!root) {
  60                 fprintf(stderr, "ERROR: cannot open ctree\n");
  61                 return 1;
  62         }
  63
  64         sb = root->fs_info->super_copy;
  65         printf("Clearing log on %s, previous log_root %llu, level %u\n",
  66                         argv[optind],
  67                         (unsigned long long)btrfs_super_log_root(sb),
  68                         (unsigned)btrfs_super_log_root_level(sb));
  69         trans = btrfs_start_transaction(root, 1);
  70         btrfs_set_super_log_root(root->fs_info->super_copy, 0);
  71         btrfs_set_super_log_root_level(root->fs_info->super_copy, 0);
  72         btrfs_commit_transaction(trans, root);
  73         close_ctree(root);
  74 out:
  75         return !!ret;
  76 }