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 #include "help.h"
  28
  29 static const char * const rescue_cmd_group_usage[] = {
  30         "btrfs rescue <command> [options] <path>",
  31         NULL
  32 };
  33
  34 int btrfs_recover_chunk_tree(char *path, int verbose, int yes);
  35 int btrfs_recover_superblocks(char *path, int verbose, int yes);
  36
  37 static const char * const cmd_rescue_chunk_recover_usage[] = {
  38         "btrfs rescue chunk-recover [options] <device>",
  39         "Recover the chunk tree by scanning the devices one by one.",
  40         "",
  41         "-y     Assume an answer of `yes' to all questions",
  42         "-v     Verbose mode",
  43         "-h     Help",
  44         NULL
  45 };
  46
  47 static int cmd_rescue_chunk_recover(int argc, char *argv[])
  48 {
  49         int ret = 0;
  50         char *file;
  51         int yes = 0;
  52         int verbose = 0;
  53
  54         while (1) {
  55                 int c = getopt(argc, argv, "yvh");
  56                 if (c < 0)
  57                         break;
  58                 switch (c) {
  59                 case 'y':
  60                         yes = 1;
  61                         break;
  62                 case 'v':
  63                         verbose = 1;
  64                         break;
  65                 case 'h':
  66                 default:
  67                         usage(cmd_rescue_chunk_recover_usage);
  68                 }
  69         }
  70
  71         if (check_argc_exact(argc - optind, 1))
  72                 usage(cmd_rescue_chunk_recover_usage);
  73
  74         file = argv[optind];
  75
  76         ret = check_mounted(file);
  77         if (ret < 0) {
  78                 error("could not check mount status: %s", strerror(-ret));
  79                 return 1;
  80         } else if (ret) {
  81                 error("the device is busy");
  82                 return 1;
  83         }
  84
  85         ret = btrfs_recover_chunk_tree(file, verbose, yes);
  86         if (!ret) {
  87                 fprintf(stdout, "Chunk tree recovered successfully\n");
  88         } else if (ret > 0) {
  89                 ret = 0;
  90                 fprintf(stdout, "Chunk tree recovery aborted\n");
  91         } else {
  92                 fprintf(stdout, "Chunk tree recovery failed\n");
  93         }
  94         return ret;
  95 }
  96
  97 static const char * const cmd_rescue_super_recover_usage[] = {
  98         "btrfs rescue super-recover [options] <device>",
  99         "Recover bad superblocks from good copies",
 100         "",
 101         "-y     Assume an answer of `yes' to all questions",
 102         "-v     Verbose mode",
 103         NULL
 104 };
 105
 106 /*
 107  * return codes:
 108  *   0 : All superblocks are valid, no need to recover
 109  *   1 : Usage or syntax error
 110  *   2 : Recover all bad superblocks successfully
 111  *   3 : Fail to Recover bad supeblocks
 112  *   4 : Abort to recover bad superblocks
 113  */
 114 static int cmd_rescue_super_recover(int argc, char **argv)
 115 {
 116         int ret;
 117         int verbose = 0;
 118         int yes = 0;
 119         char *dname;
 120
 121         while (1) {
 122                 int c = getopt(argc, argv, "vy");
 123                 if (c < 0)
 124                         break;
 125                 switch (c) {
 126                 case 'v':
 127                         verbose = 1;
 128                         break;
 129                 case 'y':
 130                         yes = 1;
 131                         break;
 132                 default:
 133                         usage(cmd_rescue_super_recover_usage);
 134                 }
 135         }
 136         if (check_argc_exact(argc - optind, 1))
 137                 usage(cmd_rescue_super_recover_usage);
 138
 139         dname = argv[optind];
 140         ret = check_mounted(dname);
 141         if (ret < 0) {
 142                 error("could not check mount status: %s", strerror(-ret));
 143                 return 1;
 144         } else if (ret) {
 145                 error("the device is busy");
 146                 return 1;
 147         }
 148         ret = btrfs_recover_superblocks(dname, verbose, yes);
 149         return ret;
 150 }
 151
 152 static const char * const cmd_rescue_zero_log_usage[] = {
 153         "btrfs rescue zero-log <device>",
 154         "Clear the tree log. Usable if it's corrupted and prevents mount.",
 155         "",
 156         NULL
 157 };
 158
 159 static int cmd_rescue_zero_log(int argc, char **argv)
 160 {
 161         struct btrfs_root *root;
 162         struct btrfs_trans_handle *trans;
 163         struct btrfs_super_block *sb;
 164         char *devname;
 165         int ret;
 166
 167         clean_args_no_options(argc, argv, cmd_rescue_zero_log_usage);
 168
 169         if (check_argc_exact(argc, 2))
 170                 usage(cmd_rescue_zero_log_usage);
 171
 172         devname = argv[optind];
 173         ret = check_mounted(devname);
 174         if (ret < 0) {
 175                 error("could not check mount status: %s", strerror(-ret));
 176                 goto out;
 177         } else if (ret) {
 178                 error("%s is currently mounted", devname);
 179                 ret = -EBUSY;
 180         }
 181
 182         root = open_ctree(devname, 0, OPEN_CTREE_WRITES | OPEN_CTREE_PARTIAL);
 183         if (!root) {
 184                 error("could not open ctree");
 185                 return 1;
 186         }
 187
 188         sb = root->fs_info->super_copy;
 189         printf("Clearing log on %s, previous log_root %llu, level %u\n",
 190                         devname,
 191                         (unsigned long long)btrfs_super_log_root(sb),
 192                         (unsigned)btrfs_super_log_root_level(sb));
 193         trans = btrfs_start_transaction(root, 1);
 194         btrfs_set_super_log_root(sb, 0);
 195         btrfs_set_super_log_root_level(sb, 0);
 196         btrfs_commit_transaction(trans, root);
 197         close_ctree(root);
 198
 199 out:
 200         return !!ret;
 201 }
 202
 203 static const char rescue_cmd_group_info[] =
 204 "toolbox for specific rescue operations";
 205
 206 const struct cmd_group rescue_cmd_group = {
 207         rescue_cmd_group_usage, rescue_cmd_group_info, {
 208                 { "chunk-recover", cmd_rescue_chunk_recover,
 209                         cmd_rescue_chunk_recover_usage, NULL, 0},
 210                 { "super-recover", cmd_rescue_super_recover,
 211                         cmd_rescue_super_recover_usage, NULL, 0},
 212                 { "zero-log", cmd_rescue_zero_log, cmd_rescue_zero_log_usage, NULL, 0},
 213                 NULL_CMD_STRUCT
 214         }
 215 };
 216
 217 int cmd_rescue(int argc, char **argv)
 218 {
 219         return handle_command_group(&rescue_cmd_group, argc, argv);
 220 }