diff options
Diffstat (limited to 'cmds-rescue.c')
| -rw-r--r-- | cmds-rescue.c | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/cmds-rescue.c b/cmds-rescue.c new file mode 100644 index 00000000..f597997b --- /dev/null +++ b/cmds-rescue.c @@ -0,0 +1,219 @@ +/* + * 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); + +static const char * const cmd_rescue_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 +}; + +static int cmd_rescue_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_rescue_chunk_recover_usage); + } + } + + if (check_argc_exact(argc - optind, 1)) + usage(cmd_rescue_chunk_recover_usage); + + file = argv[optind]; + + ret = check_mounted(file); + if (ret < 0) { + error("could not check mount status: %s", strerror(-ret)); + return 1; + } else if (ret) { + error("the device is busy"); + return 1; + } + + ret = btrfs_recover_chunk_tree(file, verbose, yes); + if (!ret) { + fprintf(stdout, "Chunk tree recovered successfully\n"); + } else if (ret > 0) { + ret = 0; + fprintf(stdout, "Chunk tree recovery aborted\n"); + } else { + fprintf(stdout, "Chunk tree recovery failed\n"); + } + return ret; +} + +static const char * const cmd_rescue_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 +}; + +/* + * 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 + */ +static int cmd_rescue_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_rescue_super_recover_usage); + } + } + if (check_argc_exact(argc - optind, 1)) + usage(cmd_rescue_super_recover_usage); + + dname = argv[optind]; + ret = check_mounted(dname); + if (ret < 0) { + error("could not check mount status: %s", strerror(-ret)); + return 1; + } else if (ret) { + error("the device is busy"); + return 1; + } + ret = btrfs_recover_superblocks(dname, verbose, yes); + return ret; +} + +static 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 +}; + +static 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; + + clean_args_no_options(argc, argv, cmd_rescue_zero_log_usage); + + if (check_argc_exact(argc, 2)) + usage(cmd_rescue_zero_log_usage); + + devname = argv[optind]; + ret = check_mounted(devname); + if (ret < 0) { + error("could not check mount status: %s", strerror(-ret)); + goto out; + } else if (ret) { + error("%s is currently mounted", devname); + ret = -EBUSY; + } + + root = open_ctree(devname, 0, OPEN_CTREE_WRITES | OPEN_CTREE_PARTIAL); + if (!root) { + error("could not open ctree"); + 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_rescue_chunk_recover, + cmd_rescue_chunk_recover_usage, NULL, 0}, + { "super-recover", cmd_rescue_super_recover, + cmd_rescue_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); +} |