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 #define _XOPEN_SOURCE 500
  20 #define _GNU_SOURCE 1
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <unistd.h>
  24 #include <fcntl.h>
  25 #include <sys/stat.h>
  26 #include "kerncompat.h"
  27 #include "ctree.h"
  28 #include "disk-io.h"
  29 #include "print-tree.h"
  30 #include "transaction.h"
  31 #include "list.h"
  32 #include "version.h"
  33 #include "utils.h"
  34
  35 static void print_usage(void)
  36 {
  37         fprintf(stderr, "usage: btrfs-zero-log dev\n");
  38         fprintf(stderr, "%s\n", BTRFS_BUILD_VERSION);
  39         exit(1);
  40 }
  41
  42 int main(int ac, char **av)
  43 {
  44         struct btrfs_root *root;
  45         struct btrfs_trans_handle *trans;
  46         int ret;
  47
  48         if (ac != 2)
  49                 print_usage();
  50
  51         radix_tree_init();
  52
  53         if((ret = check_mounted(av[1])) < 0) {
  54                 fprintf(stderr, "Could not check mount status: %s\n", strerror(-ret));
  55                 return ret;
  56         } else if(ret) {
  57                 fprintf(stderr, "%s is currently mounted. Aborting.\n", av[1]);
  58                 return -EBUSY;
  59         }
  60
  61         root = open_ctree(av[1], 0, 1);
  62
  63         if (root == NULL)
  64                 return 1;
  65
  66         trans = btrfs_start_transaction(root, 1);
  67         btrfs_set_super_log_root(&root->fs_info->super_copy, 0);
  68         btrfs_set_super_log_root_level(&root->fs_info->super_copy, 0);
  69         btrfs_commit_transaction(trans, root);
  70         close_ctree(root);
  71         return ret;
  72 }