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 "volumes.h"
  24 #include "transaction.h"
  25 #include "disk-io.h"
  26 #include "commands.h"
  27 #include "utils.h"
  28 #include "help.h"
  29
  30 static const char * const rescue_cmd_group_usage[] = {
  31         "btrfs rescue <command> [options] <path>",
  32         NULL
  33 };
  34
  35 int btrfs_recover_chunk_tree(const char *path, int verbose, int yes);
  36 int btrfs_recover_superblocks(const char *path, int verbose, int yes);
  37
  38 static const char * const cmd_rescue_chunk_recover_usage[] = {
  39         "btrfs rescue chunk-recover [options] <device>",
  40         "Recover the chunk tree by scanning the devices one by one.",
  41         "",
  42         "-y     Assume an answer of `yes' to all questions",
  43         "-v     Verbose mode",
  44         "-h     Help",
  45         NULL
  46 };
  47
  48 static int cmd_rescue_chunk_recover(int argc, char *argv[])
  49 {
  50         int ret = 0;
  51         char *file;
  52         int yes = 0;
  53         int verbose = 0;
  54
  55         optind = 0;
  56         while (1) {
  57                 int c = getopt(argc, argv, "yvh");
  58                 if (c < 0)
  59                         break;
  60                 switch (c) {
  61                 case 'y':
  62                         yes = 1;
  63                         break;
  64                 case 'v':
  65                         verbose = 1;
  66                         break;
  67                 case 'h':
  68                 default:
  69                         usage(cmd_rescue_chunk_recover_usage);
  70                 }
  71         }
  72
  73         if (check_argc_exact(argc - optind, 1))
  74                 usage(cmd_rescue_chunk_recover_usage);
  75
  76         file = argv[optind];
  77
  78         ret = check_mounted(file);
  79         if (ret < 0) {
  80                 error("could not check mount status: %s", strerror(-ret));
  81                 return 1;
  82         } else if (ret) {
  83                 error("the device is busy");
  84                 return 1;
  85         }
  86
  87         ret = btrfs_recover_chunk_tree(file, verbose, yes);
  88         if (!ret) {
  89                 fprintf(stdout, "Chunk tree recovered successfully\n");
  90         } else if (ret > 0) {
  91                 ret = 0;
  92                 fprintf(stdout, "Chunk tree recovery aborted\n");
  93         } else {
  94                 fprintf(stdout, "Chunk tree recovery failed\n");
  95         }
  96         return ret;
  97 }
  98
  99 static const char * const cmd_rescue_super_recover_usage[] = {
 100         "btrfs rescue super-recover [options] <device>",
 101         "Recover bad superblocks from good copies",
 102         "",
 103         "-y     Assume an answer of `yes' to all questions",
 104         "-v     Verbose mode",
 105         NULL
 106 };
 107
 108 /*
 109  * return codes:
 110  *   0 : All superblocks are valid, no need to recover
 111  *   1 : Usage or syntax error
 112  *   2 : Recover all bad superblocks successfully
 113  *   3 : Fail to Recover bad supeblocks
 114  *   4 : Abort to recover bad superblocks
 115  */
 116 static int cmd_rescue_super_recover(int argc, char **argv)
 117 {
 118         int ret;
 119         int verbose = 0;
 120         int yes = 0;
 121         char *dname;
 122
 123         optind = 0;
 124         while (1) {
 125                 int c = getopt(argc, argv, "vy");
 126                 if (c < 0)
 127                         break;
 128                 switch (c) {
 129                 case 'v':
 130                         verbose = 1;
 131                         break;
 132                 case 'y':
 133                         yes = 1;
 134                         break;
 135                 default:
 136                         usage(cmd_rescue_super_recover_usage);
 137                 }
 138         }
 139         if (check_argc_exact(argc - optind, 1))
 140                 usage(cmd_rescue_super_recover_usage);
 141
 142         dname = argv[optind];
 143         ret = check_mounted(dname);
 144         if (ret < 0) {
 145                 error("could not check mount status: %s", strerror(-ret));
 146                 return 1;
 147         } else if (ret) {
 148                 error("the device is busy");
 149                 return 1;
 150         }
 151         ret = btrfs_recover_superblocks(dname, verbose, yes);
 152         return ret;
 153 }
 154
 155 static const char * const cmd_rescue_zero_log_usage[] = {
 156         "btrfs rescue zero-log <device>",
 157         "Clear the tree log. Usable if it's corrupted and prevents mount.",
 158         "",
 159         NULL
 160 };
 161
 162 static int cmd_rescue_zero_log(int argc, char **argv)
 163 {
 164         struct btrfs_root *root;
 165         struct btrfs_trans_handle *trans;
 166         struct btrfs_super_block *sb;
 167         char *devname;
 168         int ret;
 169
 170         clean_args_no_options(argc, argv, cmd_rescue_zero_log_usage);
 171
 172         if (check_argc_exact(argc, 2))
 173                 usage(cmd_rescue_zero_log_usage);
 174
 175         devname = argv[optind];
 176         ret = check_mounted(devname);
 177         if (ret < 0) {
 178                 error("could not check mount status: %s", strerror(-ret));
 179                 goto out;
 180         } else if (ret) {
 181                 error("%s is currently mounted", devname);
 182                 ret = -EBUSY;
 183                 goto out;
 184         }
 185
 186         root = open_ctree(devname, 0, OPEN_CTREE_WRITES | OPEN_CTREE_PARTIAL);
 187         if (!root) {
 188                 error("could not open ctree");
 189                 return 1;
 190         }
 191
 192         sb = root->fs_info->super_copy;
 193         printf("Clearing log on %s, previous log_root %llu, level %u\n",
 194                         devname,
 195                         (unsigned long long)btrfs_super_log_root(sb),
 196                         (unsigned)btrfs_super_log_root_level(sb));
 197         trans = btrfs_start_transaction(root, 1);
 198         BUG_ON(IS_ERR(trans));
 199         btrfs_set_super_log_root(sb, 0);
 200         btrfs_set_super_log_root_level(sb, 0);
 201         btrfs_commit_transaction(trans, root);
 202         close_ctree(root);
 203
 204 out:
 205         return !!ret;
 206 }
 207
 208 static const char * const cmd_rescue_fix_device_size_usage[] = {
 209         "btrfs rescue fix-device-size <device>",
 210         "Re-align device and super block sizes. Usable if newer kernel refuse to mount it due to mismatch super size",
 211         "",
 212         NULL
 213 };
 214
 215 static int cmd_rescue_fix_device_size(int argc, char **argv)
 216 {
 217         struct btrfs_fs_info *fs_info;
 218         char *devname;
 219         int ret;
 220
 221         clean_args_no_options(argc, argv, cmd_rescue_fix_device_size_usage);
 222
 223         if (check_argc_exact(argc, 2))
 224                 usage(cmd_rescue_fix_device_size_usage);
 225
 226         devname = argv[optind];
 227         ret = check_mounted(devname);
 228         if (ret < 0) {
 229                 error("could not check mount status: %s", strerror(-ret));
 230                 goto out;
 231         } else if (ret) {
 232                 error("%s is currently mounted", devname);
 233                 ret = -EBUSY;
 234                 goto out;
 235         }
 236
 237         fs_info = open_ctree_fs_info(devname, 0, 0, 0, OPEN_CTREE_WRITES |
 238                                      OPEN_CTREE_PARTIAL);
 239         if (!fs_info) {
 240                 error("could not open btrfs");
 241                 ret = -EIO;
 242                 goto out;
 243         }
 244
 245         ret = btrfs_fix_device_and_super_size(fs_info);
 246         if (ret > 0)
 247                 ret = 0;
 248         close_ctree(fs_info->tree_root);
 249 out:
 250         return !!ret;
 251 }
 252
 253 static const char rescue_cmd_group_info[] =
 254 "toolbox for specific rescue operations";
 255
 256 const struct cmd_group rescue_cmd_group = {
 257         rescue_cmd_group_usage, rescue_cmd_group_info, {
 258                 { "chunk-recover", cmd_rescue_chunk_recover,
 259                         cmd_rescue_chunk_recover_usage, NULL, 0},
 260                 { "super-recover", cmd_rescue_super_recover,
 261                         cmd_rescue_super_recover_usage, NULL, 0},
 262                 { "zero-log", cmd_rescue_zero_log, cmd_rescue_zero_log_usage, NULL, 0},
 263                 { "fix-device-size", cmd_rescue_fix_device_size,
 264                         cmd_rescue_fix_device_size_usage, NULL, 0},
 265                 NULL_CMD_STRUCT
 266         }
 267 };
 268
 269 int cmd_rescue(int argc, char **argv)
 270 {
 271         return handle_command_group(&rescue_cmd_group, argc, argv);
 272 }