blob: dd7c01eaa956a94428b63da6e280e30878beeb3b [file] [log] [blame]
/*
* 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_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
};
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
};
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);
}
}
argc = argc - optind;
if (check_argc_exact(argc, 1))
usage(cmd_rescue_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_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);
}
}
argc = argc - optind;
if (check_argc_exact(argc, 1))
usage(cmd_rescue_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_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);
}