btrfs-progs/cmds/rescue.c
David Sterba 7fa07e2abb btrfs-progs: split open/close helpers from utils.c
There's a group of functions that are related to opening filesystem in
various modes, this can be moved to a separate file.

Signed-off-by: David Sterba <dsterba@suse.com>
2021-05-06 16:41:47 +02:00

314 lines
7.4 KiB
C

/*
* 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 <sys/sysmacros.h>
#include <getopt.h>
#include "kernel-shared/ctree.h"
#include "kernel-shared/volumes.h"
#include "kernel-shared/transaction.h"
#include "kernel-shared/disk-io.h"
#include "cmds/commands.h"
#include "common/utils.h"
#include "common/help.h"
#include "cmds/rescue.h"
#include "common/open-utils.h"
static const char * const rescue_cmd_group_usage[] = {
"btrfs rescue <command> [options] <path>",
NULL
};
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",
"-h Help",
"-v deprecated, alias for global -v option",
HELPINFO_INSERT_GLOBALS,
HELPINFO_INSERT_VERBOSE,
NULL
};
static int cmd_rescue_chunk_recover(const struct cmd_struct *cmd,
int argc, char *argv[])
{
int ret = 0;
char *file;
int yes = 0;
/* If verbose is unset, set it to 0 */
if (bconf.verbose == BTRFS_BCONF_UNSET)
bconf.verbose = BTRFS_BCONF_QUIET;
optind = 0;
while (1) {
int c = getopt(argc, argv, "yvh");
if (c < 0)
break;
switch (c) {
case 'y':
yes = 1;
break;
case 'v':
bconf.verbose++;
break;
default:
usage_unknown_option(cmd, argv);
}
}
if (check_argc_exact(argc - optind, 1))
return 1;
file = argv[optind];
ret = check_mounted(file);
if (ret < 0) {
errno = -ret;
error("could not check mount status: %m");
return 1;
} else if (ret) {
error("the device is busy");
return 1;
}
ret = btrfs_recover_chunk_tree(file, 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 DEFINE_SIMPLE_COMMAND(rescue_chunk_recover, "chunk-recover");
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 deprecated, alias for global -v option",
HELPINFO_INSERT_GLOBALS,
HELPINFO_INSERT_VERBOSE,
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 superblocks
* 4 : Abort to recover bad superblocks
*/
static int cmd_rescue_super_recover(const struct cmd_struct *cmd,
int argc, char **argv)
{
int ret;
int yes = 0;
char *dname;
optind = 0;
while (1) {
int c = getopt(argc, argv, "vy");
if (c < 0)
break;
switch (c) {
case 'v':
bconf_be_verbose();
break;
case 'y':
yes = 1;
break;
default:
usage_unknown_option(cmd, argv);
}
}
if (check_argc_exact(argc - optind, 1))
return 1;
dname = argv[optind];
ret = check_mounted(dname);
if (ret < 0) {
errno = -ret;
error("could not check mount status: %m");
return 1;
} else if (ret) {
error("the device is busy");
return 1;
}
ret = btrfs_recover_superblocks(dname, yes);
return ret;
}
static DEFINE_SIMPLE_COMMAND(rescue_super_recover, "super-recover");
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(const struct cmd_struct *cmd,
int argc, char **argv)
{
struct btrfs_root *root;
struct btrfs_super_block *sb;
char *devname;
int ret;
clean_args_no_options(cmd, argc, argv);
if (check_argc_exact(argc, 2))
return 1;
devname = argv[optind];
ret = check_mounted(devname);
if (ret < 0) {
errno = -ret;
error("could not check mount status: %m");
goto out;
} else if (ret) {
error("%s is currently mounted", devname);
ret = -EBUSY;
goto out;
}
root = open_ctree(devname, 0, OPEN_CTREE_WRITES | OPEN_CTREE_PARTIAL |
OPEN_CTREE_NO_BLOCK_GROUPS);
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));
btrfs_set_super_log_root(sb, 0);
btrfs_set_super_log_root_level(sb, 0);
ret = write_all_supers(root->fs_info);
if (ret < 0) {
errno = -ret;
error("failed to write dev supers: %m");
}
close_ctree(root);
out:
return !!ret;
}
static DEFINE_SIMPLE_COMMAND(rescue_zero_log, "zero-log");
static const char * const cmd_rescue_fix_device_size_usage[] = {
"btrfs rescue fix-device-size <device>",
"Re-align device and super block sizes. Usable if newer kernel refuse to mount it due to mismatch super size",
NULL
};
static int cmd_rescue_fix_device_size(const struct cmd_struct *cmd,
int argc, char **argv)
{
struct btrfs_fs_info *fs_info;
struct open_ctree_flags ocf = { 0 };
char *devname;
int ret;
clean_args_no_options(cmd, argc, argv);
if (check_argc_exact(argc, 2))
return 1;
devname = argv[optind];
ret = check_mounted(devname);
if (ret < 0) {
errno = -ret;
error("could not check mount status: %m");
goto out;
} else if (ret) {
error("%s is currently mounted", devname);
ret = -EBUSY;
goto out;
}
ocf.filename = devname;
ocf.flags = OPEN_CTREE_WRITES | OPEN_CTREE_PARTIAL;
fs_info = open_ctree_fs_info(&ocf);
if (!fs_info) {
error("could not open btrfs");
ret = -EIO;
goto out;
}
ret = btrfs_fix_device_and_super_size(fs_info);
if (ret > 0)
ret = 0;
close_ctree(fs_info->tree_root);
out:
return !!ret;
}
static DEFINE_SIMPLE_COMMAND(rescue_fix_device_size, "fix-device-size");
static const char * const cmd_rescue_create_control_device_usage[] = {
"btrfs rescue create-control-device",
"Create /dev/btrfs-control (see 'CONTROL DEVICE' in btrfs(5))",
NULL
};
static int cmd_rescue_create_control_device(const struct cmd_struct *cmd,
int argc, char **argv)
{
dev_t device;
int ret;
if (check_argc_exact(argc, 1))
return 1;
device = makedev(10, 234);
ret = mknod("/dev/btrfs-control", S_IFCHR | S_IRUSR | S_IWUSR, device);
if (ret) {
error("could not create /dev/btrfs-control: %m");
return 1;
}
return 0;
}
static DEFINE_SIMPLE_COMMAND(rescue_create_control_device, "create-control-device");
static const char rescue_cmd_group_info[] =
"toolbox for specific rescue operations";
static const struct cmd_group rescue_cmd_group = {
rescue_cmd_group_usage, rescue_cmd_group_info, {
&cmd_struct_rescue_chunk_recover,
&cmd_struct_rescue_super_recover,
&cmd_struct_rescue_zero_log,
&cmd_struct_rescue_fix_device_size,
&cmd_struct_rescue_create_control_device,
NULL
}
};
DEFINE_GROUP_COMMAND_TOKEN(rescue);