cmds-rescue.c

   1 /*
   2  * Copyright (C) 2013 SUSE.  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 <getopt.h>
  22 #include "ctree.h"
  23 #include "transaction.h"
  24 #include "disk-io.h"
  25 #include "commands.h"
  26 #include "utils.h"
  27
  28 static const char * const rescue_cmd_group_usage[] = {
  29         "btrfs rescue <command> [options] <path>",
  30         NULL
  31 };
  32
  33 int btrfs_recover_chunk_tree(char *path, int verbose, int yes);
  34 int btrfs_recover_superblocks(char *path, int verbose, int yes);
  35
  36 static const char * const cmd_rescue_chunk_recover_usage[] = {
  37         "btrfs rescue chunk-recover [options] <device>",
  38         "Recover the chunk tree by scanning the devices one by one.",
  39         "",
  40         "-y     Assume an answer of `yes' to all questions",
  41         "-v     Verbose mode",
  42         "-h     Help",
  43         NULL
  44 };
  45
  46 static int cmd_rescue_chunk_recover(int argc, char *argv[])
  47 {
  48         int ret = 0;
  49         char *file;
  50         int yes = 0;
  51         int verbose = 0;
  52
  53         while (1) {
  54                 int c = getopt(argc, argv, "yvh");
  55                 if (c < 0)
  56                         break;
  57                 switch (c) {
  58                 case 'y':
  59                         yes = 1;
  60                         break;
  61                 case 'v':
  62                         verbose = 1;
  63                         break;
  64                 case 'h':
  65                 default:
  66                         usage(cmd_rescue_chunk_recover_usage);
  67                 }
  68         }
  69
  70         if (check_argc_exact(argc - optind, 1))
  71                 usage(cmd_rescue_chunk_recover_usage);
  72
  73         file = argv[optind];
  74
  75         ret = check_mounted(file);
  76         if (ret < 0) {
  77                 error("could not check mount status: %s", strerror(-ret));
  78                 return 1;
  79         } else if (ret) {
  80                 error("the device is busy");
  81                 return 1;
  82         }
  83
  84         ret = btrfs_recover_chunk_tree(file, verbose, yes);
  85         if (!ret) {
  86                 fprintf(stdout, "Chunk tree recovered successfully\n");
  87         } else if (ret > 0) {
  88                 ret = 0;
  89                 fprintf(stdout, "Chunk tree recovery aborted\n");
  90         } else {
  91                 fprintf(stdout, "Chunk tree recovery failed\n");
  92         }
  93         return ret;
  94 }
  95
  96 static const char * const cmd_rescue_super_recover_usage[] = {
  97         "btrfs rescue super-recover [options] <device>",
  98         "Recover bad superblocks from good copies",
  99         "",
 100         "-y     Assume an answer of `yes' to all questions",
 101         "-v     Verbose mode",
 102         NULL
 103 };
 104
 105 /*
 106  * return codes:
 107  *   0 : All superblocks are valid, no need to recover
 108  *   1 : Usage or syntax error
 109  *   2 : Recover all bad superblocks successfully
 110  *   3 : Fail to Recover bad supeblocks
 111  *   4 : Abort to recover bad superblocks
 112  */
 113 static int cmd_rescue_super_recover(int argc, char **argv)
 114 {
 115         int ret;
 116         int verbose = 0;
 117         int yes = 0;
 118         char *dname;
 119
 120         while (1) {
 121                 int c = getopt(argc, argv, "vy");
 122                 if (c < 0)
 123                         break;
 124                 switch (c) {
 125                 case 'v':
 126                         verbose = 1;
 127                         break;
 128                 case 'y':
 129                         yes = 1;
 130                         break;
 131                 default:
 132                         usage(cmd_rescue_super_recover_usage);
 133                 }
 134         }
 135         if (check_argc_exact(argc - optind, 1))
 136                 usage(cmd_rescue_super_recover_usage);
 137
 138         dname = argv[optind];
 139         ret = check_mounted(dname);
 140         if (ret < 0) {
 141                 error("could not check mount status: %s", strerror(-ret));
 142                 return 1;
 143         } else if (ret) {
 144                 error("the device is busy");
 145                 return 1;
 146         }
 147         ret = btrfs_recover_superblocks(dname, verbose, yes);
 148         return ret;
 149 }
 150
 151 static const char * const cmd_rescue_zero_log_usage[] = {
 152         "btrfs rescue zero-log <device>",
 153         "Clear the tree log. Usable if it's corrupted and prevents mount.",
 154         "",
 155         NULL
 156 };
 157
 158 static int cmd_rescue_zero_log(int argc, char **argv)
 159 {
 160         struct btrfs_root *root;
 161         struct btrfs_trans_handle *trans;
 162         struct btrfs_super_block *sb;
 163         char *devname;
 164         int ret;
 165
 166         clean_args_no_options(argc, argv, cmd_rescue_zero_log_usage);
 167
 168         if (check_argc_exact(argc, 2))
 169                 usage(cmd_rescue_zero_log_usage);
 170
 171         devname = argv[optind];
 172         ret = check_mounted(devname);
 173         if (ret < 0) {
 174                 error("could not check mount status: %s", strerror(-ret));
 175                 goto out;
 176         } else if (ret) {
 177                 error("%s is currently mounted", devname);
 178                 ret = -EBUSY;
 179         }
 180
 181         root = open_ctree(devname, 0, OPEN_CTREE_WRITES | OPEN_CTREE_PARTIAL);
 182         if (!root) {
 183                 error("could not open ctree");
 184                 return 1;
 185         }
 186
 187         sb = root->fs_info->super_copy;
 188         printf("Clearing log on %s, previous log_root %llu, level %u\n",
 189                         devname,
 190                         (unsigned long long)btrfs_super_log_root(sb),
 191                         (unsigned)btrfs_super_log_root_level(sb));
 192         trans = btrfs_start_transaction(root, 1);
 193         btrfs_set_super_log_root(sb, 0);
 194         btrfs_set_super_log_root_level(sb, 0);
 195         btrfs_commit_transaction(trans, root);
 196         close_ctree(root);
 197
 198 out:
 199         return !!ret;
 200 }
 201
 202 static const char rescue_cmd_group_info[] =
 203 "toolbox for specific rescue operations";
 204
 205 const struct cmd_group rescue_cmd_group = {
 206         rescue_cmd_group_usage, rescue_cmd_group_info, {
 207                 { "chunk-recover", cmd_rescue_chunk_recover,
 208                         cmd_rescue_chunk_recover_usage, NULL, 0},
 209                 { "super-recover", cmd_rescue_super_recover,
 210                         cmd_rescue_super_recover_usage, NULL, 0},
 211                 { "zero-log", cmd_rescue_zero_log, cmd_rescue_zero_log_usage, NULL, 0},
 212                 NULL_CMD_STRUCT
 213         }
 214 };
 215
 216 int cmd_rescue(int argc, char **argv)
 217 {
 218         return handle_command_group(&rescue_cmd_group, argc, argv);
 219 }