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btrfs-progs/cmds-inspect-dump-super.c

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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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <ctype.h>
#include <uuid/uuid.h>
#include <errno.h>
#include <getopt.h>
#include "ctree.h"
#include "disk-io.h"
#include "print-tree.h"
#include "transaction.h"
#include "list.h"
#include "utils.h"
#include "commands.h"
#include "crc32c.h"
#include "cmds-inspect-dump-super.h"
static int check_csum_sblock(void *sb, int csum_size)
{
u8 result[BTRFS_CSUM_SIZE];
u32 crc = ~(u32)0;
crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE,
crc, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
btrfs_csum_final(crc, result);
return !memcmp(sb, &result, csum_size);
}
static void print_sys_chunk_array(struct btrfs_super_block *sb)
{
struct extent_buffer *buf;
struct btrfs_disk_key *disk_key;
struct btrfs_chunk *chunk;
u8 *array_ptr;
unsigned long sb_array_offset;
u32 num_stripes;
u32 array_size;
u32 len = 0;
u32 cur_offset;
struct btrfs_key key;
int item;
buf = malloc(sizeof(*buf) + sizeof(*sb));
if (!buf) {
error("not enough memory");
goto out;
}
write_extent_buffer(buf, sb, 0, sizeof(*sb));
array_size = btrfs_super_sys_array_size(sb);
array_ptr = sb->sys_chunk_array;
sb_array_offset = offsetof(struct btrfs_super_block, sys_chunk_array);
cur_offset = 0;
item = 0;
while (cur_offset < array_size) {
disk_key = (struct btrfs_disk_key *)array_ptr;
len = sizeof(*disk_key);
if (cur_offset + len > array_size)
goto out_short_read;
btrfs_disk_key_to_cpu(&key, disk_key);
array_ptr += len;
sb_array_offset += len;
cur_offset += len;
printf("\titem %d ", item);
btrfs_print_key(disk_key);
putchar('\n');
if (key.type == BTRFS_CHUNK_ITEM_KEY) {
chunk = (struct btrfs_chunk *)sb_array_offset;
/*
* At least one btrfs_chunk with one stripe must be
* present, exact stripe count check comes afterwards
*/
len = btrfs_chunk_item_size(1);
if (cur_offset + len > array_size)
goto out_short_read;
num_stripes = btrfs_chunk_num_stripes(buf, chunk);
if (!num_stripes) {
error(
"invalid number of stripes %u in sys_array at offset %u",
num_stripes, cur_offset);
break;
}
len = btrfs_chunk_item_size(num_stripes);
if (cur_offset + len > array_size)
goto out_short_read;
print_chunk(buf, chunk);
} else {
error("unexpected item type %u in sys_array at offset %u",
(u32)key.type, cur_offset);
break;
}
array_ptr += len;
sb_array_offset += len;
cur_offset += len;
item++;
}
free(buf);
out:
return;
out_short_read:
error("sys_array too short to read %u bytes at offset %u",
len, cur_offset);
free(buf);
}
static int empty_backup(struct btrfs_root_backup *backup)
{
if (backup == NULL ||
(backup->tree_root == 0 &&
backup->tree_root_gen == 0))
return 1;
return 0;
}
static void print_root_backup(struct btrfs_root_backup *backup)
{
printf("\t\tbackup_tree_root:\t%llu\tgen: %llu\tlevel: %d\n",
btrfs_backup_tree_root(backup),
btrfs_backup_tree_root_gen(backup),
btrfs_backup_tree_root_level(backup));
printf("\t\tbackup_chunk_root:\t%llu\tgen: %llu\tlevel: %d\n",
btrfs_backup_chunk_root(backup),
btrfs_backup_chunk_root_gen(backup),
btrfs_backup_chunk_root_level(backup));
printf("\t\tbackup_extent_root:\t%llu\tgen: %llu\tlevel: %d\n",
btrfs_backup_extent_root(backup),
btrfs_backup_extent_root_gen(backup),
btrfs_backup_extent_root_level(backup));
printf("\t\tbackup_fs_root:\t\t%llu\tgen: %llu\tlevel: %d\n",
btrfs_backup_fs_root(backup),
btrfs_backup_fs_root_gen(backup),
btrfs_backup_fs_root_level(backup));
printf("\t\tbackup_dev_root:\t%llu\tgen: %llu\tlevel: %d\n",
btrfs_backup_dev_root(backup),
btrfs_backup_dev_root_gen(backup),
btrfs_backup_dev_root_level(backup));
printf("\t\tbackup_csum_root:\t%llu\tgen: %llu\tlevel: %d\n",
btrfs_backup_csum_root(backup),
btrfs_backup_csum_root_gen(backup),
btrfs_backup_csum_root_level(backup));
printf("\t\tbackup_total_bytes:\t%llu\n",
btrfs_backup_total_bytes(backup));
printf("\t\tbackup_bytes_used:\t%llu\n",
btrfs_backup_bytes_used(backup));
printf("\t\tbackup_num_devices:\t%llu\n",
btrfs_backup_num_devices(backup));
putchar('\n');
}
static void print_backup_roots(struct btrfs_super_block *sb)
{
struct btrfs_root_backup *backup;
int i;
for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
backup = sb->super_roots + i;
if (!empty_backup(backup)) {
printf("\tbackup %d:\n", i);
print_root_backup(backup);
}
}
}
struct readable_flag_entry {
u64 bit;
char *output;
};
#define DEF_INCOMPAT_FLAG_ENTRY(bit_name) \
{BTRFS_FEATURE_INCOMPAT_##bit_name, #bit_name}
static struct readable_flag_entry incompat_flags_array[] = {
DEF_INCOMPAT_FLAG_ENTRY(MIXED_BACKREF),
DEF_INCOMPAT_FLAG_ENTRY(DEFAULT_SUBVOL),
DEF_INCOMPAT_FLAG_ENTRY(MIXED_GROUPS),
DEF_INCOMPAT_FLAG_ENTRY(COMPRESS_LZO),
DEF_INCOMPAT_FLAG_ENTRY(COMPRESS_LZOv2),
DEF_INCOMPAT_FLAG_ENTRY(BIG_METADATA),
DEF_INCOMPAT_FLAG_ENTRY(EXTENDED_IREF),
DEF_INCOMPAT_FLAG_ENTRY(RAID56),
DEF_INCOMPAT_FLAG_ENTRY(SKINNY_METADATA),
DEF_INCOMPAT_FLAG_ENTRY(NO_HOLES)
};
static const int incompat_flags_num = sizeof(incompat_flags_array) /
sizeof(struct readable_flag_entry);
#define DEF_HEADER_FLAG_ENTRY(bit_name) \
{BTRFS_HEADER_FLAG_##bit_name, #bit_name}
#define DEF_SUPER_FLAG_ENTRY(bit_name) \
{BTRFS_SUPER_FLAG_##bit_name, #bit_name}
static struct readable_flag_entry super_flags_array[] = {
DEF_HEADER_FLAG_ENTRY(WRITTEN),
DEF_HEADER_FLAG_ENTRY(RELOC),
DEF_SUPER_FLAG_ENTRY(CHANGING_FSID),
DEF_SUPER_FLAG_ENTRY(SEEDING),
DEF_SUPER_FLAG_ENTRY(METADUMP),
DEF_SUPER_FLAG_ENTRY(METADUMP_V2)
};
static const int super_flags_num = ARRAY_SIZE(super_flags_array);
#define BTRFS_SUPER_FLAG_SUPP (BTRFS_HEADER_FLAG_WRITTEN |\
BTRFS_HEADER_FLAG_RELOC |\
BTRFS_SUPER_FLAG_CHANGING_FSID |\
BTRFS_SUPER_FLAG_SEEDING |\
BTRFS_SUPER_FLAG_METADUMP |\
BTRFS_SUPER_FLAG_METADUMP_V2)
static void __print_readable_flag(u64 flag, struct readable_flag_entry *array,
int array_size, u64 supported_flags)
{
int i;
int first = 1;
struct readable_flag_entry *entry;
if (!flag)
return;
printf("\t\t\t( ");
for (i = 0; i < array_size; i++) {
entry = array + i;
if (flag & entry->bit) {
if (first)
printf("%s ", entry->output);
else
printf("|\n\t\t\t %s ", entry->output);
first = 0;
}
}
flag &= ~supported_flags;
if (flag) {
if (first)
printf("unknown flag: 0x%llx ", flag);
else
printf("|\n\t\t\t unknown flag: 0x%llx ", flag);
}
printf(")\n");
}
static void print_readable_incompat_flag(u64 flag)
{
return __print_readable_flag(flag, incompat_flags_array,
incompat_flags_num,
BTRFS_FEATURE_INCOMPAT_SUPP);
}
static void print_readable_super_flag(u64 flag)
{
return __print_readable_flag(flag, super_flags_array,
super_flags_num, BTRFS_SUPER_FLAG_SUPP);
}
static void dump_superblock(struct btrfs_super_block *sb, int full)
{
int i;
char *s, buf[BTRFS_UUID_UNPARSED_SIZE];
u8 *p;
u32 csum_size;
u16 csum_type;
csum_type = btrfs_super_csum_type(sb);
csum_size = BTRFS_CSUM_SIZE;
printf("csum_type\t\t%hu (", csum_type);
if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) {
printf("INVALID");
} else {
if (csum_type == BTRFS_CSUM_TYPE_CRC32) {
printf("crc32c");
csum_size = btrfs_csum_sizes[csum_type];
} else {
printf("unknown");
}
}
printf(")\n");
printf("csum_size\t\t%llu\n", (unsigned long long)csum_size);
printf("csum\t\t\t0x");
for (i = 0, p = sb->csum; i < csum_size; i++)
printf("%02x", p[i]);
if (check_csum_sblock(sb, csum_size))
printf(" [match]");
else
printf(" [DON'T MATCH]");
putchar('\n');
printf("bytenr\t\t\t%llu\n",
(unsigned long long)btrfs_super_bytenr(sb));
printf("flags\t\t\t0x%llx\n",
(unsigned long long)btrfs_super_flags(sb));
print_readable_super_flag(btrfs_super_flags(sb));
printf("magic\t\t\t");
s = (char *) &sb->magic;
for (i = 0; i < 8; i++)
putchar(isprint(s[i]) ? s[i] : '.');
if (btrfs_super_magic(sb) == BTRFS_MAGIC)
printf(" [match]\n");
else
printf(" [DON'T MATCH]\n");
uuid_unparse(sb->fsid, buf);
printf("fsid\t\t\t%s\n", buf);
printf("label\t\t\t");
s = sb->label;
for (i = 0; i < BTRFS_LABEL_SIZE && s[i]; i++)
putchar(isprint(s[i]) ? s[i] : '.');
putchar('\n');
printf("generation\t\t%llu\n",
(unsigned long long)btrfs_super_generation(sb));
printf("root\t\t\t%llu\n", (unsigned long long)btrfs_super_root(sb));
printf("sys_array_size\t\t%llu\n",
(unsigned long long)btrfs_super_sys_array_size(sb));
printf("chunk_root_generation\t%llu\n",
(unsigned long long)btrfs_super_chunk_root_generation(sb));
printf("root_level\t\t%llu\n",
(unsigned long long)btrfs_super_root_level(sb));
printf("chunk_root\t\t%llu\n",
(unsigned long long)btrfs_super_chunk_root(sb));
printf("chunk_root_level\t%llu\n",
(unsigned long long)btrfs_super_chunk_root_level(sb));
printf("log_root\t\t%llu\n",
(unsigned long long)btrfs_super_log_root(sb));
printf("log_root_transid\t%llu\n",
(unsigned long long)btrfs_super_log_root_transid(sb));
printf("log_root_level\t\t%llu\n",
(unsigned long long)btrfs_super_log_root_level(sb));
printf("total_bytes\t\t%llu\n",
(unsigned long long)btrfs_super_total_bytes(sb));
printf("bytes_used\t\t%llu\n",
(unsigned long long)btrfs_super_bytes_used(sb));
printf("sectorsize\t\t%llu\n",
(unsigned long long)btrfs_super_sectorsize(sb));
printf("nodesize\t\t%llu\n",
(unsigned long long)btrfs_super_nodesize(sb));
printf("leafsize\t\t%llu\n",
(unsigned long long)btrfs_super_leafsize(sb));
printf("stripesize\t\t%llu\n",
(unsigned long long)btrfs_super_stripesize(sb));
printf("root_dir\t\t%llu\n",
(unsigned long long)btrfs_super_root_dir(sb));
printf("num_devices\t\t%llu\n",
(unsigned long long)btrfs_super_num_devices(sb));
printf("compat_flags\t\t0x%llx\n",
(unsigned long long)btrfs_super_compat_flags(sb));
printf("compat_ro_flags\t\t0x%llx\n",
(unsigned long long)btrfs_super_compat_ro_flags(sb));
printf("incompat_flags\t\t0x%llx\n",
(unsigned long long)btrfs_super_incompat_flags(sb));
print_readable_incompat_flag(btrfs_super_incompat_flags(sb));
printf("cache_generation\t%llu\n",
(unsigned long long)btrfs_super_cache_generation(sb));
printf("uuid_tree_generation\t%llu\n",
(unsigned long long)btrfs_super_uuid_tree_generation(sb));
uuid_unparse(sb->dev_item.uuid, buf);
printf("dev_item.uuid\t\t%s\n", buf);
uuid_unparse(sb->dev_item.fsid, buf);
printf("dev_item.fsid\t\t%s %s\n", buf,
!memcmp(sb->dev_item.fsid, sb->fsid, BTRFS_FSID_SIZE) ?
"[match]" : "[DON'T MATCH]");
printf("dev_item.type\t\t%llu\n", (unsigned long long)
btrfs_stack_device_type(&sb->dev_item));
printf("dev_item.total_bytes\t%llu\n", (unsigned long long)
btrfs_stack_device_total_bytes(&sb->dev_item));
printf("dev_item.bytes_used\t%llu\n", (unsigned long long)
btrfs_stack_device_bytes_used(&sb->dev_item));
printf("dev_item.io_align\t%u\n", (unsigned int)
btrfs_stack_device_io_align(&sb->dev_item));
printf("dev_item.io_width\t%u\n", (unsigned int)
btrfs_stack_device_io_width(&sb->dev_item));
printf("dev_item.sector_size\t%u\n", (unsigned int)
btrfs_stack_device_sector_size(&sb->dev_item));
printf("dev_item.devid\t\t%llu\n",
btrfs_stack_device_id(&sb->dev_item));
printf("dev_item.dev_group\t%u\n", (unsigned int)
btrfs_stack_device_group(&sb->dev_item));
printf("dev_item.seek_speed\t%u\n", (unsigned int)
btrfs_stack_device_seek_speed(&sb->dev_item));
printf("dev_item.bandwidth\t%u\n", (unsigned int)
btrfs_stack_device_bandwidth(&sb->dev_item));
printf("dev_item.generation\t%llu\n", (unsigned long long)
btrfs_stack_device_generation(&sb->dev_item));
if (full) {
printf("sys_chunk_array[%d]:\n", BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
print_sys_chunk_array(sb);
printf("backup_roots[%d]:\n", BTRFS_NUM_BACKUP_ROOTS);
print_backup_roots(sb);
}
}
static int load_and_dump_sb(char *filename, int fd, u64 sb_bytenr, int full,
int force)
{
u8 super_block_data[BTRFS_SUPER_INFO_SIZE];
struct btrfs_super_block *sb;
u64 ret;
sb = (struct btrfs_super_block *)super_block_data;
ret = pread64(fd, super_block_data, BTRFS_SUPER_INFO_SIZE, 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",
filename, (unsigned long long)sb_bytenr);
error("error = '%s', errno = %d", strerror(errno), errno);
return 1;
}
printf("superblock: bytenr=%llu, device=%s\n", sb_bytenr, filename);
printf("---------------------------------------------------------\n");
if (btrfs_super_magic(sb) != BTRFS_MAGIC && !force) {
error("bad magic on superblock on %s at %llu",
filename, (unsigned long long)sb_bytenr);
} else {
dump_superblock(sb, full);
}
return 0;
}
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",
"-f|--full print full superblock information, backup roots etc.",
"-a|--all print information about all superblocks",
"-s|--super <super> specify which copy to print out (values: 0, 1, 2)",
"-F|--force attempt to dump superblocks with bad magic",
"--bytenr <offset> specify alternate superblock offset",
"",
"Deprecated syntax:",
"-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)",
"-i <super> specify which copy to print out (values: 0, 1, 2), now moved",
" to -s|--super",
NULL
};
int cmd_inspect_dump_super(int argc, char **argv)
{
int all = 0;
int full = 0;
int force = 0;
char *filename;
int fd = -1;
int i;
int ret = 0;
u64 arg;
u64 sb_bytenr = btrfs_sb_offset(0);
while (1) {
int c;
static const struct option long_options[] = {
{"all", no_argument, NULL, 'a'},
{"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 = 1;
break;
case 'f':
full = 1;
break;
case 'F':
force = 1;
break;
case 's':
arg = arg_strtou64(optarg);
if (BTRFS_SUPER_MIRROR_MAX <= arg) {
warning(
"deprecated use of -s <bytenr> with %llu, assuming --bytenr",
(unsigned long long)arg);
sb_bytenr = arg;
} else {
sb_bytenr = btrfs_sb_offset(arg);
}
all = 0;
break;
default:
usage(cmd_inspect_dump_super_usage);
}
}
if (check_argc_min(argc - optind, 1))
usage(cmd_inspect_dump_super_usage);
for (i = optind; i < argc; i++) {
filename = argv[i];
fd = open(filename, O_RDONLY);
if (fd < 0) {
error("cannot open %s: %s", filename, strerror(errno));
ret = 1;
goto out;
}
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);
ret = 1;
goto out;
}
putchar('\n');
}
} else {
load_and_dump_sb(filename, fd, sb_bytenr, full, force);
putchar('\n');
}
close(fd);
}
out:
return ret;
}
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