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