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/*
* volume_id - reads filesystem label and uuid
*
* Copyright (C) 2012 S-G Bergh <sgb@systemasis.org>
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
//kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_F2FS) += f2fs.o
//config:config FEATURE_VOLUMEID_F2FS
//config: bool "f2fs filesystem"
//config: default y
//config: depends on VOLUMEID
//config: help
//config: F2FS (aka Flash-Friendly File System) is a log-structured file system,
//config: which is adapted to newer forms of storage. F2FS also remedies some
//config: known issues of the older log structured file systems, such as high
//config: cleaning overhead.
#include "volume_id_internal.h"
#define F2FS_MAGIC 0xF2F52010 // F2FS Magic Number
#define F2FS_UUID_SIZE 16
#define F2FS_LABEL_SIZE 512
#define F2FS_LABEL_BYTES 1024
#define F2FS_SB1_OFFSET 0x400 // offset for 1:st super block
/*
#define F2FS_SB2_OFFSET 0x1400 // offset for 2:nd super block
*/
struct f2fs_super_block { // According to version 1.1
/* 0x00 */ uint32_t magic; // Magic Number
/* 0x04 */ uint16_t major_ver; // Major Version
/* 0x06 */ uint16_t minor_ver; // Minor Version
/* 0x08 */ uint32_t log_sectorsize; // log2 sector size in bytes
/* 0x0C */ uint32_t log_sectors_per_block; // log2 # of sectors per block
/* 0x10 */ uint32_t log_blocksize; // log2 block size in bytes
/* 0x14 */ uint32_t log_blocks_per_seg; // log2 # of blocks per segment
/* 0x18 */ uint32_t segs_per_sec; // # of segments per section
/* 0x1C */ uint32_t secs_per_zone; // # of sections per zone
/* 0x20 */ uint32_t checksum_offset; // checksum offset inside super block
/* 0x24 */ uint64_t block_count; // total # of user blocks
/* 0x2C */ uint32_t section_count; // total # of sections
/* 0x30 */ uint32_t segment_count; // total # of segments
/* 0x34 */ uint32_t segment_count_ckpt; // # of segments for checkpoint
/* 0x38 */ uint32_t segment_count_sit; // # of segments for SIT
/* 0x3C */ uint32_t segment_count_nat; // # of segments for NAT
/* 0x40 */ uint32_t segment_count_ssa; // # of segments for SSA
/* 0x44 */ uint32_t segment_count_main; // # of segments for main area
/* 0x48 */ uint32_t segment0_blkaddr; // start block address of segment 0
/* 0x4C */ uint32_t cp_blkaddr; // start block address of checkpoint
/* 0x50 */ uint32_t sit_blkaddr; // start block address of SIT
/* 0x54 */ uint32_t nat_blkaddr; // start block address of NAT
/* 0x58 */ uint32_t ssa_blkaddr; // start block address of SSA
/* 0x5C */ uint32_t main_blkaddr; // start block address of main area
/* 0x60 */ uint32_t root_ino; // root inode number
/* 0x64 */ uint32_t node_ino; // node inode number
/* 0x68 */ uint32_t meta_ino; // meta inode number
/* 0x6C */ uint8_t uuid[F2FS_UUID_SIZE]; // 128-bit uuid for volume
/* 0x7C */ uint16_t volume_name[F2FS_LABEL_SIZE]; // volume name
// /* 0x47C */ uint32_t extension_count; // # of extensions below
// /* 0x480 */ uint8_t extension_list[64][8]; // extension array
} PACKED;
int FAST_FUNC volume_id_probe_f2fs(struct volume_id *id /*,uint64_t off*/)
{
struct f2fs_super_block *sb;
// Go for primary super block (ignore second sb)
dbg("f2fs: probing at offset 0x%x", F2FS_SB1_OFFSET);
sb = volume_id_get_buffer(id, F2FS_SB1_OFFSET, sizeof(*sb));
if (!sb)
return -1;
if (sb->magic != cpu_to_le32(F2FS_MAGIC))
return -1;
IF_FEATURE_BLKID_TYPE(id->type = "f2fs");
// For version 1.0 we don't know sb structure and can't set label/uuid
if (sb->major_ver == cpu_to_le16(1) && sb->minor_ver == cpu_to_le16(0))
return 0;
volume_id_set_label_unicode16(id, (uint8_t *)sb->volume_name,
LE, MIN(F2FS_LABEL_BYTES, VOLUME_ID_LABEL_SIZE));
volume_id_set_uuid(id, sb->uuid, UUID_DCE);
return 0;
}
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