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/*
* 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/stat.h>
#include <linux/fs.h>
#include <stdbool.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <getopt.h>
#include "kernel-shared/accessors.h"
#include "kernel-shared/uapi/btrfs_tree.h"
#include "kernel-shared/ctree.h"
#include "kernel-shared/disk-io.h"
#include "kernel-shared/print-tree.h"
#include "kernel-shared/zoned.h"
#include "common/help.h"
#include "common/string-utils.h"
#include "common/messages.h"
#include "cmds/commands.h"
static int load_and_dump_sb(char *filename, int fd, u64 sb_bytenr, int full,
int force)
{
struct btrfs_super_block sb;
struct stat st;
u64 ret;
if (fstat(fd, &st) < 0) {
error("unable to stat %s to when loading superblock: %m", filename);
return 1;
}
if (S_ISBLK(st.st_mode) || S_ISREG(st.st_mode)) {
off_t last_byte;
last_byte = lseek(fd, 0, SEEK_END);
if (last_byte == -1) {
error("cannot read end of file %s: %m", filename);
return 1;
}
if (sb_bytenr > last_byte)
return 0;
}
ret = sbread(fd, &sb, sb_bytenr);
if (ret != BTRFS_SUPER_INFO_SIZE) {
/* check if the disk if too short for further superblock */
if (ret == 0 && errno == 0)
return 0;
error("failed to read the superblock on %s at %llu read %llu/%d bytes",
filename, sb_bytenr, ret, BTRFS_SUPER_INFO_SIZE);
error("error = '%m', errno = %d", errno);
return 1;
}
pr_verbose(LOG_DEFAULT, "superblock: bytenr=%llu, device=%s\n", sb_bytenr, filename);
pr_verbose(LOG_DEFAULT, "---------------------------------------------------------\n");
if (btrfs_super_magic(&sb) != BTRFS_MAGIC && !force) {
error("bad magic on superblock on %s at %llu (use --force to dump it anyway)",
filename, sb_bytenr);
return 1;
}
btrfs_print_superblock(&sb, full);
putchar('\n');
return 0;
}
static const char * const cmd_inspect_dump_super_usage[] = {
"btrfs inspect-internal dump-super [options] device [device...]",
"Dump superblock from a device in a textual form",
"",
OPTLINE("-f|--full", "print full superblock information, backup roots etc."),
OPTLINE("-a|--all", "print information about all superblocks"),
OPTLINE("-s|--super <super>", "specify which copy to print out (values: 0, 1, 2)"),
OPTLINE("-F|--force", "attempt to dump superblocks with bad magic"),
OPTLINE("--bytenr <offset>", "specify alternate superblock offset"),
"",
"Deprecated syntax:",
OPTLINE("-s <bytenr>", "specify alternate superblock offset, values other than 0, 1, 2 "
"will be interpreted as --bytenr for backward compatibility, "
"option renamed for consistency with other tools (eg. check)"),
OPTLINE("-i <super>", "specify which copy to print out (values: 0, 1, 2), now moved to --super"),
NULL
};
static int cmd_inspect_dump_super(const struct cmd_struct *cmd,
int argc, char **argv)
{
bool all = false;
bool full = false;
bool force = false;
char *filename;
int fd = -1;
int i;
u64 arg;
u64 sb_bytenr = btrfs_sb_offset(0);
while (1) {
int c;
enum { GETOPT_VAL_BYTENR = GETOPT_VAL_FIRST };
static const struct option long_options[] = {
{"all", no_argument, NULL, 'a'},
{"bytenr", required_argument, NULL, GETOPT_VAL_BYTENR },
{"full", no_argument, NULL, 'f'},
{"force", no_argument, NULL, 'F'},
{"super", required_argument, NULL, 's' },
{NULL, 0, NULL, 0}
};
c = getopt_long(argc, argv, "fFai:s:", long_options, NULL);
if (c < 0)
break;
switch (c) {
case 'i':
warning(
"option -i is deprecated, please use -s or --super");
arg = arg_strtou64(optarg);
if (arg >= BTRFS_SUPER_MIRROR_MAX) {
error("super mirror too big: %llu >= %d",
arg, BTRFS_SUPER_MIRROR_MAX);
return 1;
}
sb_bytenr = btrfs_sb_offset(arg);
break;
case 'a':
all = true;
break;
case 'f':
full = true;
break;
case 'F':
force = true;
break;
case 's':
arg = arg_strtou64(optarg);
if (BTRFS_SUPER_MIRROR_MAX <= arg) {
warning(
"deprecated use of -s <bytenr> with %llu, assuming --bytenr",
arg);
sb_bytenr = arg;
} else {
sb_bytenr = btrfs_sb_offset(arg);
}
all = false;
break;
case GETOPT_VAL_BYTENR:
arg = arg_strtou64(optarg);
sb_bytenr = arg;
all = false;
break;
default:
usage_unknown_option(cmd, argv);
}
}
if (check_argc_min(argc - optind, 1))
return 1;
for (i = optind; i < argc; i++) {
filename = argv[i];
fd = open(filename, O_RDONLY);
if (fd < 0) {
error("cannot open %s: %m", filename);
return 1;
}
if (all) {
int idx;
for (idx = 0; idx < BTRFS_SUPER_MIRROR_MAX; idx++) {
sb_bytenr = btrfs_sb_offset(idx);
if (load_and_dump_sb(filename, fd,
sb_bytenr, full, force)) {
close(fd);
return 1;
}
}
} else {
if (load_and_dump_sb(filename, fd, sb_bytenr, full, force)) {
close(fd);
return 1;
}
}
close(fd);
}
return 0;
}
DEFINE_SIMPLE_COMMAND(inspect_dump_super, "dump-super");
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