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Diffstat (limited to 'util-linux/volume_id/f2fs.c')
| -rw-r--r-- | util-linux/volume_id/f2fs.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/util-linux/volume_id/f2fs.c b/util-linux/volume_id/f2fs.c new file mode 100644 index 000000000..bf0b66278 --- /dev/null +++ b/util-linux/volume_id/f2fs.c @@ -0,0 +1,95 @@ +/* + * 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: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. +//config: + +#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; +} |