1/* 2 * volume_id - reads filesystem label and uuid 3 * 4 * Copyright (C) 2012 S-G Bergh <sgb@systemasis.org> 5 * 6 * Licensed under GPLv2, see file LICENSE in this source tree. 7 */ 8//config:config FEATURE_VOLUMEID_F2FS 9//config: bool "f2fs filesystem" 10//config: default y 11//config: depends on VOLUMEID 12//config: help 13//config: F2FS (aka Flash-Friendly File System) is a log-structured file system, 14//config: which is adapted to newer forms of storage. F2FS also remedies some 15//config: known issues of the older log structured file systems, such as high 16//config: cleaning overhead. 17 18//kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_F2FS) += f2fs.o 19 20#include "volume_id_internal.h" 21 22#define F2FS_MAGIC 0xF2F52010 // F2FS Magic Number 23#define F2FS_UUID_SIZE 16 24#define F2FS_LABEL_SIZE 512 25#define F2FS_LABEL_BYTES 1024 26#define F2FS_SB1_OFFSET 0x400 // offset for 1:st super block 27/* 28#define F2FS_SB2_OFFSET 0x1400 // offset for 2:nd super block 29*/ 30 31struct f2fs_super_block { // According to version 1.1 32/* 0x00 */ uint32_t magic; // Magic Number 33/* 0x04 */ uint16_t major_ver; // Major Version 34/* 0x06 */ uint16_t minor_ver; // Minor Version 35/* 0x08 */ uint32_t log_sectorsize; // log2 sector size in bytes 36/* 0x0C */ uint32_t log_sectors_per_block; // log2 # of sectors per block 37/* 0x10 */ uint32_t log_blocksize; // log2 block size in bytes 38/* 0x14 */ uint32_t log_blocks_per_seg; // log2 # of blocks per segment 39/* 0x18 */ uint32_t segs_per_sec; // # of segments per section 40/* 0x1C */ uint32_t secs_per_zone; // # of sections per zone 41/* 0x20 */ uint32_t checksum_offset; // checksum offset inside super block 42/* 0x24 */ uint64_t block_count; // total # of user blocks 43/* 0x2C */ uint32_t section_count; // total # of sections 44/* 0x30 */ uint32_t segment_count; // total # of segments 45/* 0x34 */ uint32_t segment_count_ckpt; // # of segments for checkpoint 46/* 0x38 */ uint32_t segment_count_sit; // # of segments for SIT 47/* 0x3C */ uint32_t segment_count_nat; // # of segments for NAT 48/* 0x40 */ uint32_t segment_count_ssa; // # of segments for SSA 49/* 0x44 */ uint32_t segment_count_main; // # of segments for main area 50/* 0x48 */ uint32_t segment0_blkaddr; // start block address of segment 0 51/* 0x4C */ uint32_t cp_blkaddr; // start block address of checkpoint 52/* 0x50 */ uint32_t sit_blkaddr; // start block address of SIT 53/* 0x54 */ uint32_t nat_blkaddr; // start block address of NAT 54/* 0x58 */ uint32_t ssa_blkaddr; // start block address of SSA 55/* 0x5C */ uint32_t main_blkaddr; // start block address of main area 56/* 0x60 */ uint32_t root_ino; // root inode number 57/* 0x64 */ uint32_t node_ino; // node inode number 58/* 0x68 */ uint32_t meta_ino; // meta inode number 59/* 0x6C */ uint8_t uuid[F2FS_UUID_SIZE]; // 128-bit uuid for volume 60/* 0x7C */ uint16_t volume_name[F2FS_LABEL_SIZE]; // volume name 61// /* 0x47C */ uint32_t extension_count; // # of extensions below 62// /* 0x480 */ uint8_t extension_list[64][8]; // extension array 63} PACKED; 64 65 66int FAST_FUNC volume_id_probe_f2fs(struct volume_id *id /*,uint64_t off*/) 67{ 68 struct f2fs_super_block *sb; 69 70 // Go for primary super block (ignore second sb) 71 dbg("f2fs: probing at offset 0x%x", F2FS_SB1_OFFSET); 72 sb = volume_id_get_buffer(id, F2FS_SB1_OFFSET, sizeof(*sb)); 73 74 if (!sb) 75 return -1; 76 77 if (sb->magic != cpu_to_le32(F2FS_MAGIC)) 78 return -1; 79 80 IF_FEATURE_BLKID_TYPE(id->type = "f2fs"); 81 82 // For version 1.0 we don't know sb structure and can't set label/uuid 83 if (sb->major_ver == cpu_to_le16(1) && sb->minor_ver == cpu_to_le16(0)) 84 return 0; 85 86 volume_id_set_label_unicode16(id, (uint8_t *)sb->volume_name, 87 LE, MIN(F2FS_LABEL_BYTES, VOLUME_ID_LABEL_SIZE)); 88 89 volume_id_set_uuid(id, sb->uuid, UUID_DCE); 90 91 return 0; 92} 93