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/*
* Copyright (C) 2010 Jeroen Oortwijn <oortwijn@gmail.com>
*
* This file may be redistributed under the terms of the
* GNU Lesser General Public License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <inttypes.h>
#include "superblocks.h"
#define B_OS_NAME_LENGTH 0x20
#define SUPER_BLOCK_MAGIC1 0x42465331 /* BFS1 */
#define SUPER_BLOCK_MAGIC2 0xdd121031
#define SUPER_BLOCK_MAGIC3 0x15b6830e
#define SUPER_BLOCK_FS_ENDIAN 0x42494745 /* BIGE */
#define INODE_MAGIC1 0x3bbe0ad9
#define B_UINT64_TYPE 0x554C4C47 /* ULLG */
#define FS16_TO_CPU(value, fs_is_le) (fs_is_le ? le16_to_cpu(value) \
: be16_to_cpu(value))
#define FS32_TO_CPU(value, fs_is_le) (fs_is_le ? le32_to_cpu(value) \
: be32_to_cpu(value))
#define FS64_TO_CPU(value, fs_is_le) (fs_is_le ? le64_to_cpu(value) \
: be64_to_cpu(value))
typedef struct block_run {
int32_t allocation_group;
uint16_t start;
uint16_t len;
} __attribute__((packed)) block_run, inode_addr;
struct befs_super_block {
char name[B_OS_NAME_LENGTH];
int32_t magic1;
int32_t fs_byte_order;
uint32_t block_size;
uint32_t block_shift;
int64_t num_blocks;
int64_t used_blocks;
int32_t inode_size;
int32_t magic2;
int32_t blocks_per_ag;
int32_t ag_shift;
int32_t num_ags;
int32_t flags;
block_run log_blocks;
int64_t log_start;
int64_t log_end;
int32_t magic3;
inode_addr root_dir;
inode_addr indices;
int32_t pad[8];
} __attribute__((packed));
typedef struct data_stream {
block_run direct[12];
int64_t max_direct_range;
block_run indirect;
int64_t max_indirect_range;
block_run double_indirect;
int64_t max_double_indirect_range;
int64_t size;
} __attribute__((packed)) data_stream;
struct befs_inode {
int32_t magic1;
inode_addr inode_num;
int32_t uid;
int32_t gid;
int32_t mode;
int32_t flags;
int64_t create_time;
int64_t last_modified_time;
inode_addr parent;
inode_addr attributes;
uint32_t type;
int32_t inode_size;
uint32_t etc;
data_stream data;
int32_t pad[4];
int32_t small_data[1];
} __attribute__((packed));
struct small_data {
uint32_t type;
uint16_t name_size;
uint16_t data_size;
char name[0];
} __attribute__((packed));
static int probe_befs(blkid_probe pr, const struct blkid_idmag *mag)
{
struct befs_super_block *bs;
struct befs_inode *bi;
struct small_data *sd;
int fs_le;
uint64_t volume_id = 0;
bs = (struct befs_super_block *) blkid_probe_get_buffer(pr,
mag->sboff - B_OS_NAME_LENGTH,
sizeof(struct befs_super_block));
if (!bs)
return -1;
if (le32_to_cpu(bs->magic1) == SUPER_BLOCK_MAGIC1
&& le32_to_cpu(bs->magic2) == SUPER_BLOCK_MAGIC2
&& le32_to_cpu(bs->magic3) == SUPER_BLOCK_MAGIC3
&& le32_to_cpu(bs->fs_byte_order) == SUPER_BLOCK_FS_ENDIAN) {
fs_le = 1;
blkid_probe_set_version(pr, "little-endian");
} else if (be32_to_cpu(bs->magic1) == SUPER_BLOCK_MAGIC1
&& be32_to_cpu(bs->magic2) == SUPER_BLOCK_MAGIC2
&& be32_to_cpu(bs->magic3) == SUPER_BLOCK_MAGIC3
&& be32_to_cpu(bs->fs_byte_order) == SUPER_BLOCK_FS_ENDIAN) {
fs_le = 0;
blkid_probe_set_version(pr, "big-endian");
} else {
return -1;
}
if (strlen(bs->name))
blkid_probe_set_label(pr, (unsigned char *) bs->name,
sizeof(bs->name));
bi = (struct befs_inode *) blkid_probe_get_buffer(pr,
(FS32_TO_CPU(bs->root_dir.allocation_group, fs_le)
<< FS32_TO_CPU(bs->ag_shift, fs_le)
<< FS32_TO_CPU(bs->block_shift, fs_le))
+ (FS16_TO_CPU(bs->root_dir.start, fs_le)
<< FS32_TO_CPU(bs->block_shift, fs_le)),
FS16_TO_CPU(bs->root_dir.len, fs_le)
<< FS32_TO_CPU(bs->block_shift, fs_le));
if (!bi)
return -1;
if (FS32_TO_CPU(bi->magic1, fs_le) != INODE_MAGIC1)
return -1;
sd = (struct small_data *) bi->small_data;
do {
if (FS32_TO_CPU(sd->type, fs_le) == B_UINT64_TYPE
&& FS16_TO_CPU(sd->name_size, fs_le) == 12
&& FS16_TO_CPU(sd->data_size, fs_le) == 8
&& strcmp(sd->name, "be:volume_id") == 0) {
volume_id = *(uint64_t *) ((uint8_t *) sd->name
+ FS16_TO_CPU(sd->name_size, fs_le)
+ 3);
blkid_probe_sprintf_uuid(pr,
(unsigned char *) &volume_id,
sizeof(volume_id),
"%016" PRIx64,
FS64_TO_CPU(volume_id, fs_le));
break;
} else if (FS32_TO_CPU(sd->type, fs_le) == 0
&& FS16_TO_CPU(sd->name_size, fs_le) == 0
&& FS16_TO_CPU(sd->data_size, fs_le) == 0) {
break;
}
sd = (struct small_data *) ((uint8_t *) sd
+ sizeof(struct small_data)
+ FS16_TO_CPU(sd->name_size, fs_le) + 3
+ FS16_TO_CPU(sd->data_size, fs_le) + 1);
} while ((intptr_t) sd < (intptr_t) bi
+ FS32_TO_CPU(bi->inode_size, fs_le)
- sizeof(struct small_data));
if (volume_id == 0) {
/*
* TODO: Search for the be:volume_id attribute in the
* attributes directory of the root directory.
*/
}
return 0;
}
const struct blkid_idinfo befs_idinfo =
{
.name = "befs",
.usage = BLKID_USAGE_FILESYSTEM,
.probefunc = probe_befs,
.minsz = 1024 * 1440,
.magics = {
{ .magic = "BFS1", .len = 4, .sboff = B_OS_NAME_LENGTH },
{ .magic = "1SFB", .len = 4, .sboff = B_OS_NAME_LENGTH },
{ .magic = "BFS1", .len = 4, .sboff = 0x200 +
B_OS_NAME_LENGTH },
{ .magic = "1SFB", .len = 4, .sboff = 0x200 +
B_OS_NAME_LENGTH },
{ NULL }
}
};
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