/* * 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; }