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 #include "help.h"
  28
  29 __attribute__((noreturn)) static void print_usage(void)
  30 {
  31         printf("usage: btrfs-zero-log dev\n");
  32         exit(1);
  33 }
  34
  35 int main(int argc, char **argv)
  36 {
  37         struct btrfs_root *root;
  38         struct btrfs_trans_handle *trans;
  39         struct btrfs_super_block *sb;
  40         int ret;
  41
  42         set_argv0(argv);
  43         if (check_argc_exact(argc - optind, 1))
  44                 print_usage();
  45
  46         radix_tree_init();
  47
  48         printf("WARNING: this utility is deprecated, please use 'btrfs rescue zero-log'\n\n");
  49
  50         if ((ret = check_mounted(argv[optind])) < 0) {
  51                 fprintf(stderr, "ERROR: could not check mount status: %s\n", strerror(-ret));
  52                 goto out;
  53         } else if (ret) {
  54                 fprintf(stderr, "ERROR: %s is currently mounted\n", argv[optind]);
  55                 ret = -EBUSY;
  56                 goto out;
  57         }
  58
  59         root = open_ctree(argv[optind], 0, OPEN_CTREE_WRITES | OPEN_CTREE_PARTIAL);
  60         if (!root) {
  61                 fprintf(stderr, "ERROR: cannot open ctree\n");
  62                 return 1;
  63         }
  64
  65         sb = root->fs_info->super_copy;
  66         printf("Clearing log on %s, previous log_root %llu, level %u\n",
  67                         argv[optind],
  68                         (unsigned long long)btrfs_super_log_root(sb),
  69                         (unsigned)btrfs_super_log_root_level(sb));
  70         trans = btrfs_start_transaction(root, 1);
  71         BUG_ON(IS_ERR(trans));
  72         btrfs_set_super_log_root(root->fs_info->super_copy, 0);
  73         btrfs_set_super_log_root_level(root->fs_info->super_copy, 0);
  74         btrfs_commit_transaction(trans, root);
  75         close_ctree(root);
  76 out:
  77         return !!ret;
  78 }