use libblkid to get filesystem type
we can now use libblkid to detect exfat
diff --git a/libblkid/befs.c b/libblkid/befs.c
new file mode 100644
index 0000000..847860a
--- /dev/null
+++ b/libblkid/befs.c
@@ -0,0 +1,480 @@
+/*
+ * Copyright (C) 2010 Jeroen Oortwijn <oortwijn@gmail.com>
+ *
+ * Partly based on the Haiku BFS driver by
+ * Axel Dörfler <axeld@pinc-software.de>
+ *
+ * Also inspired by the Linux BeFS driver by
+ * Will Dyson <will_dyson@pobox.com>, et al.
+ *
+ * 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 <byteswap.h>
+#include "bitops.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 BPLUSTREE_MAGIC 0x69f6c2e8
+#define BPLUSTREE_NULL -1LL
+#define NUM_DIRECT_BLOCKS 12
+#define B_UINT64_TYPE 0x554c4c47 /* ULLG */
+#define KEY_NAME "be:volume_id"
+#define KEY_SIZE 8
+#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[NUM_DIRECT_BLOCKS];
+ 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[0];
+} __attribute__((packed));
+
+struct small_data {
+ uint32_t type;
+ uint16_t name_size;
+ uint16_t data_size;
+ char name[0];
+} __attribute__((packed));
+
+struct bplustree_header {
+ uint32_t magic;
+ uint32_t node_size;
+ uint32_t max_number_of_levels;
+ uint32_t data_type;
+ int64_t root_node_pointer;
+ int64_t free_node_pointer;
+ int64_t maximum_size;
+} __attribute__((packed));
+
+struct bplustree_node {
+ int64_t left_link;
+ int64_t right_link;
+ int64_t overflow_link;
+ uint16_t all_key_count;
+ uint16_t all_key_length;
+ char name[0];
+} __attribute__((packed));
+
+static unsigned char *get_block_run(blkid_probe pr, const struct befs_super_block *bs,
+ const struct block_run *br, int fs_le)
+{
+ return blkid_probe_get_buffer(pr,
+ ((blkid_loff_t) FS32_TO_CPU(br->allocation_group, fs_le)
+ << FS32_TO_CPU(bs->ag_shift, fs_le)
+ << FS32_TO_CPU(bs->block_shift, fs_le))
+ + ((blkid_loff_t) FS16_TO_CPU(br->start, fs_le)
+ << FS32_TO_CPU(bs->block_shift, fs_le)),
+ (blkid_loff_t) FS16_TO_CPU(br->len, fs_le)
+ << FS32_TO_CPU(bs->block_shift, fs_le));
+}
+
+static unsigned char *get_custom_block_run(blkid_probe pr,
+ const struct befs_super_block *bs,
+ const struct block_run *br,
+ int64_t offset, uint32_t length, int fs_le)
+{
+ if (offset + length > (int64_t) FS16_TO_CPU(br->len, fs_le)
+ << FS32_TO_CPU(bs->block_shift, fs_le))
+ return NULL;
+
+ return blkid_probe_get_buffer(pr,
+ ((blkid_loff_t) FS32_TO_CPU(br->allocation_group, fs_le)
+ << FS32_TO_CPU(bs->ag_shift, fs_le)
+ << FS32_TO_CPU(bs->block_shift, fs_le))
+ + ((blkid_loff_t) FS16_TO_CPU(br->start, fs_le)
+ << FS32_TO_CPU(bs->block_shift, fs_le))
+ + offset,
+ length);
+}
+
+static unsigned char *get_tree_node(blkid_probe pr, const struct befs_super_block *bs,
+ const struct data_stream *ds,
+ int64_t start, uint32_t length, int fs_le)
+{
+ if (start < (int64_t) FS64_TO_CPU(ds->max_direct_range, fs_le)) {
+ int64_t br_len;
+ size_t i;
+
+ for (i = 0; i < NUM_DIRECT_BLOCKS; i++) {
+ br_len = (int64_t) FS16_TO_CPU(ds->direct[i].len, fs_le)
+ << FS32_TO_CPU(bs->block_shift, fs_le);
+ if (start < br_len)
+ return get_custom_block_run(pr, bs,
+ &ds->direct[i],
+ start, length, fs_le);
+ else
+ start -= br_len;
+ }
+ } else if (start < (int64_t) FS64_TO_CPU(ds->max_indirect_range, fs_le)) {
+ struct block_run *br;
+ int64_t max_br, br_len, i;
+
+ start -= FS64_TO_CPU(ds->max_direct_range, fs_le);
+ max_br = ((int64_t) FS16_TO_CPU(ds->indirect.len, fs_le)
+ << FS32_TO_CPU(bs->block_shift, fs_le))
+ / sizeof(struct block_run);
+
+ br = (struct block_run *) get_block_run(pr, bs, &ds->indirect,
+ fs_le);
+ if (!br)
+ return NULL;
+
+ for (i = 0; i < max_br; i++) {
+ br_len = (int64_t) FS16_TO_CPU(br[i].len, fs_le)
+ << FS32_TO_CPU(bs->block_shift, fs_le);
+ if (start < br_len)
+ return get_custom_block_run(pr, bs, &br[i],
+ start, length, fs_le);
+ else
+ start -= br_len;
+ }
+ } else if (start < (int64_t) FS64_TO_CPU(ds->max_double_indirect_range, fs_le)) {
+ struct block_run *br;
+ int64_t di_br_size, br_per_di_br, di_index, i_index;
+
+ start -= (int64_t) FS64_TO_CPU(ds->max_indirect_range, fs_le);
+
+ di_br_size = (int64_t) FS16_TO_CPU(ds->double_indirect.len,
+ fs_le) << FS32_TO_CPU(bs->block_shift, fs_le);
+ if (di_br_size == 0)
+ return NULL;
+
+ br_per_di_br = di_br_size / sizeof(struct block_run);
+ if (br_per_di_br == 0)
+ return NULL;
+
+ di_index = start / (br_per_di_br * di_br_size);
+ i_index = (start % (br_per_di_br * di_br_size)) / di_br_size;
+ start = (start % (br_per_di_br * di_br_size)) % di_br_size;
+
+ br = (struct block_run *) get_block_run(pr, bs,
+ &ds->double_indirect, fs_le);
+ if (!br)
+ return NULL;
+
+ br = (struct block_run *) get_block_run(pr, bs, &br[di_index],
+ fs_le);
+ if (!br)
+ return NULL;
+
+ return get_custom_block_run(pr, bs, &br[i_index], start, length,
+ fs_le);
+ }
+ return NULL;
+}
+
+static int32_t compare_keys(const char keys1[], uint16_t keylengths1[], int32_t index,
+ const char *key2, uint16_t keylength2, int fs_le)
+{
+ const char *key1;
+ uint16_t keylength1;
+ int32_t result;
+
+ key1 = &keys1[index == 0 ? 0 : FS16_TO_CPU(keylengths1[index - 1],
+ fs_le)];
+ keylength1 = FS16_TO_CPU(keylengths1[index], fs_le)
+ - (index == 0 ? 0 : FS16_TO_CPU(keylengths1[index - 1],
+ fs_le));
+
+ result = strncmp(key1, key2, min(keylength1, keylength2));
+
+ if (result == 0)
+ return keylength1 - keylength2;
+
+ return result;
+}
+
+static int64_t get_key_value(blkid_probe pr, const struct befs_super_block *bs,
+ const struct befs_inode *bi, const char *key, int fs_le)
+{
+ struct bplustree_header *bh;
+ struct bplustree_node *bn;
+ uint16_t *keylengths;
+ int64_t *values;
+ int64_t node_pointer;
+ int32_t first, last, mid, cmp;
+
+ bh = (struct bplustree_header *) get_tree_node(pr, bs, &bi->data, 0,
+ sizeof(struct bplustree_header), fs_le);
+ if (!bh)
+ return -1;
+
+ if ((int32_t) FS32_TO_CPU(bh->magic, fs_le) != BPLUSTREE_MAGIC)
+ return -1;
+
+ node_pointer = FS64_TO_CPU(bh->root_node_pointer, fs_le);
+
+ do {
+ bn = (struct bplustree_node *) get_tree_node(pr, bs, &bi->data,
+ node_pointer, FS32_TO_CPU(bh->node_size, fs_le), fs_le);
+ if (!bn)
+ return -1;
+
+ keylengths = (uint16_t *) ((uint8_t *) bn
+ + ((sizeof(struct bplustree_node)
+ + FS16_TO_CPU(bn->all_key_length, fs_le)
+ + sizeof(int64_t) - 1)
+ & ~(sizeof(int64_t) - 1)));
+ values = (int64_t *) ((uint8_t *) keylengths
+ + FS16_TO_CPU(bn->all_key_count, fs_le)
+ * sizeof(uint16_t));
+ first = 0;
+ mid = 0;
+ last = FS16_TO_CPU(bn->all_key_count, fs_le) - 1;
+
+ cmp = compare_keys(bn->name, keylengths, last, key, strlen(key),
+ fs_le);
+ if (cmp == 0) {
+ if ((int64_t) FS64_TO_CPU(bn->overflow_link, fs_le)
+ == BPLUSTREE_NULL)
+ return FS64_TO_CPU(values[last], fs_le);
+ else
+ node_pointer = FS64_TO_CPU(values[last], fs_le);
+ } else if (cmp < 0)
+ node_pointer = FS64_TO_CPU(bn->overflow_link, fs_le);
+ else {
+ while (first <= last) {
+ mid = (first + last) / 2;
+
+ cmp = compare_keys(bn->name, keylengths, mid,
+ key, strlen(key), fs_le);
+ if (cmp == 0) {
+ if ((int64_t) FS64_TO_CPU(bn->overflow_link,
+ fs_le) == BPLUSTREE_NULL)
+ return FS64_TO_CPU(values[mid],
+ fs_le);
+ else
+ break;
+ } else if (cmp < 0)
+ first = mid + 1;
+ else
+ last = mid - 1;
+ }
+ if (cmp < 0)
+ node_pointer = FS64_TO_CPU(values[mid + 1],
+ fs_le);
+ else
+ node_pointer = FS64_TO_CPU(values[mid], fs_le);
+ }
+ } while ((int64_t) FS64_TO_CPU(bn->overflow_link, fs_le)
+ != BPLUSTREE_NULL);
+ return 0;
+}
+
+static int get_uuid(blkid_probe pr, const struct befs_super_block *bs,
+ uint64_t * const uuid, int fs_le)
+{
+ struct befs_inode *bi;
+ struct small_data *sd;
+
+ bi = (struct befs_inode *) get_block_run(pr, bs, &bs->root_dir, 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) == strlen(KEY_NAME)
+ && FS16_TO_CPU(sd->data_size, fs_le) == KEY_SIZE
+ && strcmp(sd->name, KEY_NAME) == 0) {
+
+ memcpy(uuid,
+ sd->name + FS16_TO_CPU(sd->name_size, fs_le) + 3,
+ sizeof(uint64_t));
+
+ 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
+ + (int32_t) FS32_TO_CPU(bi->inode_size, fs_le)
+ - (int32_t) sizeof(struct small_data));
+ if (*uuid == 0
+ && (FS32_TO_CPU(bi->attributes.allocation_group, fs_le) != 0
+ || FS16_TO_CPU(bi->attributes.start, fs_le) != 0
+ || FS16_TO_CPU(bi->attributes.len, fs_le) != 0)) {
+ int64_t value;
+
+ bi = (struct befs_inode *) get_block_run(pr, bs,
+ &bi->attributes, fs_le);
+ if (!bi)
+ return -1;
+
+ if (FS32_TO_CPU(bi->magic1, fs_le) != INODE_MAGIC1)
+ return -1;
+
+ value = get_key_value(pr, bs, bi, KEY_NAME, fs_le);
+
+ if (value < 0)
+ return value;
+ else if (value > 0) {
+ bi = (struct befs_inode *) blkid_probe_get_buffer(pr,
+ value << FS32_TO_CPU(bs->block_shift, fs_le),
+ FS32_TO_CPU(bs->block_size, fs_le));
+ if (!bi)
+ return -1;
+
+ if (FS32_TO_CPU(bi->magic1, fs_le) != INODE_MAGIC1)
+ return -1;
+
+ if (FS32_TO_CPU(bi->type, fs_le) == B_UINT64_TYPE
+ && FS64_TO_CPU(bi->data.size, fs_le) == KEY_SIZE
+ && FS16_TO_CPU(bi->data.direct[0].len, fs_le)
+ == 1) {
+ uint64_t *attr_data;
+
+ attr_data = (uint64_t *) get_block_run(pr, bs,
+ &bi->data.direct[0], fs_le);
+ if (!attr_data)
+ return -1;
+
+ *uuid = *attr_data;
+ }
+ }
+ }
+ return 0;
+}
+
+static int probe_befs(blkid_probe pr, const struct blkid_idmag *mag)
+{
+ struct befs_super_block *bs;
+ const char *version = NULL;
+ uint64_t volume_id = 0;
+ int fs_le, ret;
+
+ 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;
+ version = "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;
+ version = "big-endian";
+ } else
+ return -1;
+
+ ret = get_uuid(pr, bs, &volume_id, fs_le);
+
+ if (ret < 0)
+ return ret;
+
+ /*
+ * all checks pass, set LABEL, VERSION and UUID
+ */
+ if (strlen(bs->name))
+ blkid_probe_set_label(pr, (unsigned char *) bs->name,
+ sizeof(bs->name));
+ if (version)
+ blkid_probe_set_version(pr, version);
+
+ if (volume_id)
+ blkid_probe_sprintf_uuid(pr, (unsigned char *) &volume_id,
+ sizeof(volume_id), "%016" PRIx64,
+ FS64_TO_CPU(volume_id, fs_le));
+ 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 }
+ }
+};