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 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 const char * const cmd_rescue_super_recover_usage[] = {
  47         "btrfs rescue super-recover [options] <device>",
  48         "Recover bad superblocks from good copies",
  49         "",
  50         "-y     Assume an answer of `yes' to all questions",
  51         "-v     Verbose mode",
  52         NULL
  53 };
  54
  55 int cmd_rescue_chunk_recover(int argc, char *argv[])
  56 {
  57         int ret = 0;
  58         char *file;
  59         int yes = 0;
  60         int verbose = 0;
  61
  62         while (1) {
  63                 int c = getopt(argc, argv, "yvh");
  64                 if (c < 0)
  65                         break;
  66                 switch (c) {
  67                 case 'y':
  68                         yes = 1;
  69                         break;
  70                 case 'v':
  71                         verbose = 1;
  72                         break;
  73                 case 'h':
  74                 default:
  75                         usage(cmd_rescue_chunk_recover_usage);
  76                 }
  77         }
  78
  79         argc = argc - optind;
  80         if (check_argc_exact(argc, 1))
  81                 usage(cmd_rescue_chunk_recover_usage);
  82
  83         file = argv[optind];
  84
  85         ret = check_mounted(file);
  86         if (ret < 0) {
  87                 fprintf(stderr, "Could not check mount status: %s\n",
  88                         strerror(-ret));
  89                 return 1;
  90         } else if (ret) {
  91                 fprintf(stderr, "the device is busy\n");
  92                 return 1;
  93         }
  94
  95         ret = btrfs_recover_chunk_tree(file, verbose, yes);
  96         if (!ret) {
  97                 fprintf(stdout, "Recover the chunk tree successfully.\n");
  98         } else if (ret > 0) {
  99                 ret = 0;
 100                 fprintf(stdout, "Abort to rebuild the on-disk chunk tree.\n");
 101         } else {
 102                 fprintf(stdout, "Fail to recover the chunk tree.\n");
 103         }
 104         return ret;
 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 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         argc = argc - optind;
 138         if (check_argc_exact(argc, 1))
 139                 usage(cmd_rescue_super_recover_usage);
 140
 141         dname = argv[optind];
 142         ret = check_mounted(dname);
 143         if (ret < 0) {
 144                 fprintf(stderr, "Could not check mount status: %s\n",
 145                         strerror(-ret));
 146                 return 1;
 147         } else if (ret) {
 148                 fprintf(stderr, "the device is busy\n");
 149                 return 1;
 150         }
 151         ret = btrfs_recover_superblocks(dname, verbose, yes);
 152         return ret;
 153 }
 154
 155 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 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         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                 fprintf(stderr, "Could not check mount status: %s\n", strerror(-ret));
 177                 goto out;
 178         } else if (ret) {
 179                 fprintf(stderr, "%s is currently mounted. Aborting.\n", devname);
 180                 ret = -EBUSY;
 181         }
 182
 183         root = open_ctree(devname, 0, OPEN_CTREE_WRITES | OPEN_CTREE_PARTIAL);
 184         if (!root) {
 185                 fprintf(stderr, "Could not open ctree\n");
 186                 return 1;
 187         }
 188
 189         sb = root->fs_info->super_copy;
 190         printf("Clearing log on %s, previous log_root %llu, level %u\n",
 191                         devname,
 192                         (unsigned long long)btrfs_super_log_root(sb),
 193                         (unsigned)btrfs_super_log_root_level(sb));
 194         trans = btrfs_start_transaction(root, 1);
 195         btrfs_set_super_log_root(sb, 0);
 196         btrfs_set_super_log_root_level(sb, 0);
 197         btrfs_commit_transaction(trans, root);
 198         close_ctree(root);
 199
 200 out:
 201         return !!ret;
 202 }
 203
 204 static const char rescue_cmd_group_info[] =
 205 "toolbox for specific rescue operations";
 206
 207 const struct cmd_group rescue_cmd_group = {
 208         rescue_cmd_group_usage, rescue_cmd_group_info, {
 209                 { "chunk-recover", cmd_rescue_chunk_recover,
 210                         cmd_rescue_chunk_recover_usage, NULL, 0},
 211                 { "super-recover", cmd_rescue_super_recover,
 212                         cmd_rescue_super_recover_usage, NULL, 0},
 213                 { "zero-log", cmd_rescue_zero_log, cmd_rescue_zero_log_usage, NULL, 0},
 214                 NULL_CMD_STRUCT
 215         }
 216 };
 217
 218 int cmd_rescue(int argc, char **argv)
 219 {
 220         return handle_command_group(&rescue_cmd_group, argc, argv);
 221 }