| /* |
| * Copyright (C) 2013 SUSE. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public |
| * License v2 as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public |
| * License along with this program; if not, write to the |
| * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| * Boston, MA 021110-1307, USA. |
| */ |
| |
| #include "kerncompat.h" |
| |
| #include <getopt.h> |
| #include "ctree.h" |
| #include "transaction.h" |
| #include "disk-io.h" |
| #include "commands.h" |
| #include "utils.h" |
| |
| static const char * const rescue_cmd_group_usage[] = { |
| "btrfs rescue <command> [options] <path>", |
| NULL |
| }; |
| |
| int btrfs_recover_chunk_tree(char *path, int verbose, int yes); |
| int btrfs_recover_superblocks(char *path, int verbose, int yes); |
| |
| const char * const cmd_chunk_recover_usage[] = { |
| "btrfs rescue chunk-recover [options] <device>", |
| "Recover the chunk tree by scanning the devices one by one.", |
| "", |
| "-y Assume an answer of `yes' to all questions", |
| "-v Verbose mode", |
| "-h Help", |
| NULL |
| }; |
| |
| const char * const cmd_super_recover_usage[] = { |
| "btrfs rescue super-recover [options] <device>", |
| "Recover bad superblocks from good copies", |
| "", |
| "-y Assume an answer of `yes' to all questions", |
| "-v Verbose mode", |
| NULL |
| }; |
| |
| int cmd_chunk_recover(int argc, char *argv[]) |
| { |
| int ret = 0; |
| char *file; |
| int yes = 0; |
| int verbose = 0; |
| |
| while (1) { |
| int c = getopt(argc, argv, "yvh"); |
| if (c < 0) |
| break; |
| switch (c) { |
| case 'y': |
| yes = 1; |
| break; |
| case 'v': |
| verbose = 1; |
| break; |
| case 'h': |
| default: |
| usage(cmd_chunk_recover_usage); |
| } |
| } |
| |
| argc = argc - optind; |
| if (check_argc_exact(argc, 1)) |
| usage(cmd_chunk_recover_usage); |
| |
| file = argv[optind]; |
| |
| ret = check_mounted(file); |
| if (ret < 0) { |
| fprintf(stderr, "Could not check mount status: %s\n", |
| strerror(-ret)); |
| return 1; |
| } else if (ret) { |
| fprintf(stderr, "the device is busy\n"); |
| return 1; |
| } |
| |
| ret = btrfs_recover_chunk_tree(file, verbose, yes); |
| if (!ret) { |
| fprintf(stdout, "Recover the chunk tree successfully.\n"); |
| } else if (ret > 0) { |
| ret = 0; |
| fprintf(stdout, "Abort to rebuild the on-disk chunk tree.\n"); |
| } else { |
| fprintf(stdout, "Fail to recover the chunk tree.\n"); |
| } |
| return ret; |
| } |
| |
| /* |
| * return codes: |
| * 0 : All superblocks are valid, no need to recover |
| * 1 : Usage or syntax error |
| * 2 : Recover all bad superblocks successfully |
| * 3 : Fail to Recover bad supeblocks |
| * 4 : Abort to recover bad superblocks |
| */ |
| int cmd_super_recover(int argc, char **argv) |
| { |
| int ret; |
| int verbose = 0; |
| int yes = 0; |
| char *dname; |
| |
| while (1) { |
| int c = getopt(argc, argv, "vy"); |
| if (c < 0) |
| break; |
| switch (c) { |
| case 'v': |
| verbose = 1; |
| break; |
| case 'y': |
| yes = 1; |
| break; |
| default: |
| usage(cmd_super_recover_usage); |
| } |
| } |
| argc = argc - optind; |
| if (check_argc_exact(argc, 1)) |
| usage(cmd_super_recover_usage); |
| |
| dname = argv[optind]; |
| ret = check_mounted(dname); |
| if (ret < 0) { |
| fprintf(stderr, "Could not check mount status: %s\n", |
| strerror(-ret)); |
| return 1; |
| } else if (ret) { |
| fprintf(stderr, "the device is busy\n"); |
| return 1; |
| } |
| ret = btrfs_recover_superblocks(dname, verbose, yes); |
| return ret; |
| } |
| |
| const char * const cmd_rescue_zero_log_usage[] = { |
| "btrfs rescue zero-log <device>", |
| "Clear the tree log. Usable if it's corrupted and prevents mount.", |
| "", |
| NULL |
| }; |
| |
| int cmd_rescue_zero_log(int argc, char **argv) |
| { |
| struct btrfs_root *root; |
| struct btrfs_trans_handle *trans; |
| struct btrfs_super_block *sb; |
| char *devname; |
| int ret; |
| |
| if (check_argc_exact(argc, 2)) |
| usage(cmd_rescue_zero_log_usage); |
| |
| devname = argv[optind]; |
| ret = check_mounted(devname); |
| if (ret < 0) { |
| fprintf(stderr, "Could not check mount status: %s\n", strerror(-ret)); |
| goto out; |
| } else if (ret) { |
| fprintf(stderr, "%s is currently mounted. Aborting.\n", devname); |
| ret = -EBUSY; |
| } |
| |
| root = open_ctree(devname, 0, OPEN_CTREE_WRITES | OPEN_CTREE_PARTIAL); |
| if (!root) { |
| fprintf(stderr, "Could not open ctree\n"); |
| return 1; |
| } |
| |
| sb = root->fs_info->super_copy; |
| printf("Clearing log on %s, previous log_root %llu, level %u\n", |
| devname, |
| (unsigned long long)btrfs_super_log_root(sb), |
| (unsigned)btrfs_super_log_root_level(sb)); |
| trans = btrfs_start_transaction(root, 1); |
| btrfs_set_super_log_root(sb, 0); |
| btrfs_set_super_log_root_level(sb, 0); |
| btrfs_commit_transaction(trans, root); |
| close_ctree(root); |
| |
| out: |
| return !!ret; |
| } |
| |
| static const char rescue_cmd_group_info[] = |
| "toolbox for specific rescue operations"; |
| |
| const struct cmd_group rescue_cmd_group = { |
| rescue_cmd_group_usage, rescue_cmd_group_info, { |
| { "chunk-recover", cmd_chunk_recover, cmd_chunk_recover_usage, NULL, 0}, |
| { "super-recover", cmd_super_recover, cmd_super_recover_usage, NULL, 0}, |
| { "zero-log", cmd_rescue_zero_log, cmd_rescue_zero_log_usage, NULL, 0}, |
| NULL_CMD_STRUCT |
| } |
| }; |
| |
| int cmd_rescue(int argc, char **argv) |
| { |
| return handle_command_group(&rescue_cmd_group, argc, argv); |
| } |