Edit File: f2fs_fs.h
/** * include/linux/f2fs_fs.h * * Copyright (c) 2012 Samsung Electronics Co., Ltd. * http://www.samsung.com/ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #ifndef _LINUX_F2FS_FS_H #define _LINUX_F2FS_FS_H #include <linux/pagemap.h> #include <linux/types.h> #define F2FS_SUPER_OFFSET 1024 /* byte-size offset */ #define F2FS_LOG_SECTOR_SIZE 9 /* 9 bits for 512 byte */ #define F2FS_LOG_SECTORS_PER_BLOCK 3 /* 4KB: F2FS_BLKSIZE */ #define F2FS_BLKSIZE 4096 /* support only 4KB block */ #define F2FS_MAX_EXTENSION 64 /* # of extension entries */ #define NULL_ADDR 0x0U #define NEW_ADDR -1U #define F2FS_ROOT_INO(sbi) (sbi->root_ino_num) #define F2FS_NODE_INO(sbi) (sbi->node_ino_num) #define F2FS_META_INO(sbi) (sbi->meta_ino_num) /* This flag is used by node and meta inodes, and by recovery */ #define GFP_F2FS_ZERO (GFP_NOFS | __GFP_ZERO) /* * For further optimization on multi-head logs, on-disk layout supports maximum * 16 logs by default. The number, 16, is expected to cover all the cases * enoughly. The implementaion currently uses no more than 6 logs. * Half the logs are used for nodes, and the other half are used for data. */ #define MAX_ACTIVE_LOGS 16 #define MAX_ACTIVE_NODE_LOGS 8 #define MAX_ACTIVE_DATA_LOGS 8 /* * For superblock */ struct f2fs_super_block { __le32 magic; /* Magic Number */ __le16 major_ver; /* Major Version */ __le16 minor_ver; /* Minor Version */ __le32 log_sectorsize; /* log2 sector size in bytes */ __le32 log_sectors_per_block; /* log2 # of sectors per block */ __le32 log_blocksize; /* log2 block size in bytes */ __le32 log_blocks_per_seg; /* log2 # of blocks per segment */ __le32 segs_per_sec; /* # of segments per section */ __le32 secs_per_zone; /* # of sections per zone */ __le32 checksum_offset; /* checksum offset inside super block */ __le64 block_count; /* total # of user blocks */ __le32 section_count; /* total # of sections */ __le32 segment_count; /* total # of segments */ __le32 segment_count_ckpt; /* # of segments for checkpoint */ __le32 segment_count_sit; /* # of segments for SIT */ __le32 segment_count_nat; /* # of segments for NAT */ __le32 segment_count_ssa; /* # of segments for SSA */ __le32 segment_count_main; /* # of segments for main area */ __le32 segment0_blkaddr; /* start block address of segment 0 */ __le32 cp_blkaddr; /* start block address of checkpoint */ __le32 sit_blkaddr; /* start block address of SIT */ __le32 nat_blkaddr; /* start block address of NAT */ __le32 ssa_blkaddr; /* start block address of SSA */ __le32 main_blkaddr; /* start block address of main area */ __le32 root_ino; /* root inode number */ __le32 node_ino; /* node inode number */ __le32 meta_ino; /* meta inode number */ __u8 uuid[16]; /* 128-bit uuid for volume */ __le16 volume_name[512]; /* volume name */ __le32 extension_count; /* # of extensions below */ __u8 extension_list[F2FS_MAX_EXTENSION][8]; /* extension array */ } __packed; /* * For checkpoint */ #define CP_ERROR_FLAG 0x00000008 #define CP_COMPACT_SUM_FLAG 0x00000004 #define CP_ORPHAN_PRESENT_FLAG 0x00000002 #define CP_UMOUNT_FLAG 0x00000001 struct f2fs_checkpoint { __le64 checkpoint_ver; /* checkpoint block version number */ __le64 user_block_count; /* # of user blocks */ __le64 valid_block_count; /* # of valid blocks in main area */ __le32 rsvd_segment_count; /* # of reserved segments for gc */ __le32 overprov_segment_count; /* # of overprovision segments */ __le32 free_segment_count; /* # of free segments in main area */ /* information of current node segments */ __le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS]; __le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS]; /* information of current data segments */ __le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS]; __le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS]; __le32 ckpt_flags; /* Flags : umount and journal_present */ __le32 cp_pack_total_block_count; /* total # of one cp pack */ __le32 cp_pack_start_sum; /* start block number of data summary */ __le32 valid_node_count; /* Total number of valid nodes */ __le32 valid_inode_count; /* Total number of valid inodes */ __le32 next_free_nid; /* Next free node number */ __le32 sit_ver_bitmap_bytesize; /* Default value 64 */ __le32 nat_ver_bitmap_bytesize; /* Default value 256 */ __le32 checksum_offset; /* checksum offset inside cp block */ __le64 elapsed_time; /* mounted time */ /* allocation type of current segment */ unsigned char alloc_type[MAX_ACTIVE_LOGS]; /* SIT and NAT version bitmap */ unsigned char sit_nat_version_bitmap[1]; } __packed; /* * For orphan inode management */ #define F2FS_ORPHANS_PER_BLOCK 1020 struct f2fs_orphan_block { __le32 ino[F2FS_ORPHANS_PER_BLOCK]; /* inode numbers */ __le32 reserved; /* reserved */ __le16 blk_addr; /* block index in current CP */ __le16 blk_count; /* Number of orphan inode blocks in CP */ __le32 entry_count; /* Total number of orphan nodes in current CP */ __le32 check_sum; /* CRC32 for orphan inode block */ } __packed; /* * For NODE structure */ struct f2fs_extent { __le32 fofs; /* start file offset of the extent */ __le32 blk_addr; /* start block address of the extent */ __le32 len; /* lengh of the extent */ } __packed; #define F2FS_NAME_LEN 255 #define ADDRS_PER_INODE 923 /* Address Pointers in an Inode */ #define ADDRS_PER_BLOCK 1018 /* Address Pointers in a Direct Block */ #define NIDS_PER_BLOCK 1018 /* Node IDs in an Indirect Block */ struct f2fs_inode { __le16 i_mode; /* file mode */ __u8 i_advise; /* file hints */ __u8 i_reserved; /* reserved */ __le32 i_uid; /* user ID */ __le32 i_gid; /* group ID */ __le32 i_links; /* links count */ __le64 i_size; /* file size in bytes */ __le64 i_blocks; /* file size in blocks */ __le64 i_atime; /* access time */ __le64 i_ctime; /* change time */ __le64 i_mtime; /* modification time */ __le32 i_atime_nsec; /* access time in nano scale */ __le32 i_ctime_nsec; /* change time in nano scale */ __le32 i_mtime_nsec; /* modification time in nano scale */ __le32 i_generation; /* file version (for NFS) */ __le32 i_current_depth; /* only for directory depth */ __le32 i_xattr_nid; /* nid to save xattr */ __le32 i_flags; /* file attributes */ __le32 i_pino; /* parent inode number */ __le32 i_namelen; /* file name length */ __u8 i_name[F2FS_NAME_LEN]; /* file name for SPOR */ __u8 i_reserved2; /* for backward compatibility */ struct f2fs_extent i_ext; /* caching a largest extent */ __le32 i_addr[ADDRS_PER_INODE]; /* Pointers to data blocks */ __le32 i_nid[5]; /* direct(2), indirect(2), double_indirect(1) node id */ } __packed; struct direct_node { __le32 addr[ADDRS_PER_BLOCK]; /* array of data block address */ } __packed; struct indirect_node { __le32 nid[NIDS_PER_BLOCK]; /* array of data block address */ } __packed; enum { COLD_BIT_SHIFT = 0, FSYNC_BIT_SHIFT, DENT_BIT_SHIFT, OFFSET_BIT_SHIFT }; struct node_footer { __le32 nid; /* node id */ __le32 ino; /* inode nunmber */ __le32 flag; /* include cold/fsync/dentry marks and offset */ __le64 cp_ver; /* checkpoint version */ __le32 next_blkaddr; /* next node page block address */ } __packed; struct f2fs_node { /* can be one of three types: inode, direct, and indirect types */ union { struct f2fs_inode i; struct direct_node dn; struct indirect_node in; }; struct node_footer footer; } __packed; /* * For NAT entries */ #define NAT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_nat_entry)) struct f2fs_nat_entry { __u8 version; /* latest version of cached nat entry */ __le32 ino; /* inode number */ __le32 block_addr; /* block address */ } __packed; struct f2fs_nat_block { struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK]; } __packed; /* * For SIT entries * * Each segment is 2MB in size by default so that a bitmap for validity of * there-in blocks should occupy 64 bytes, 512 bits. * Not allow to change this. */ #define SIT_VBLOCK_MAP_SIZE 64 #define SIT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_sit_entry)) /* * Note that f2fs_sit_entry->vblocks has the following bit-field information. * [15:10] : allocation type such as CURSEG_XXXX_TYPE * [9:0] : valid block count */ #define SIT_VBLOCKS_SHIFT 10 #define SIT_VBLOCKS_MASK ((1 << SIT_VBLOCKS_SHIFT) - 1) #define GET_SIT_VBLOCKS(raw_sit) \ (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK) #define GET_SIT_TYPE(raw_sit) \ ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK) \ >> SIT_VBLOCKS_SHIFT) struct f2fs_sit_entry { __le16 vblocks; /* reference above */ __u8 valid_map[SIT_VBLOCK_MAP_SIZE]; /* bitmap for valid blocks */ __le64 mtime; /* segment age for cleaning */ } __packed; struct f2fs_sit_block { struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK]; } __packed; /* * For segment summary * * One summary block contains exactly 512 summary entries, which represents * exactly 2MB segment by default. Not allow to change the basic units. * * NOTE: For initializing fields, you must use set_summary * * - If data page, nid represents dnode's nid * - If node page, nid represents the node page's nid. * * The ofs_in_node is used by only data page. It represents offset * from node's page's beginning to get a data block address. * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node) */ #define ENTRIES_IN_SUM 512 #define SUMMARY_SIZE (7) /* sizeof(struct summary) */ #define SUM_FOOTER_SIZE (5) /* sizeof(struct summary_footer) */ #define SUM_ENTRY_SIZE (SUMMARY_SIZE * ENTRIES_IN_SUM) /* a summary entry for a 4KB-sized block in a segment */ struct f2fs_summary { __le32 nid; /* parent node id */ union { __u8 reserved[3]; struct { __u8 version; /* node version number */ __le16 ofs_in_node; /* block index in parent node */ } __packed; }; } __packed; /* summary block type, node or data, is stored to the summary_footer */ #define SUM_TYPE_NODE (1) #define SUM_TYPE_DATA (0) struct summary_footer { unsigned char entry_type; /* SUM_TYPE_XXX */ __u32 check_sum; /* summary checksum */ } __packed; #define SUM_JOURNAL_SIZE (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\ SUM_ENTRY_SIZE) #define NAT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ sizeof(struct nat_journal_entry)) #define NAT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ sizeof(struct nat_journal_entry)) #define SIT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ sizeof(struct sit_journal_entry)) #define SIT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ sizeof(struct sit_journal_entry)) /* * frequently updated NAT/SIT entries can be stored in the spare area in * summary blocks */ enum { NAT_JOURNAL = 0, SIT_JOURNAL }; struct nat_journal_entry { __le32 nid; struct f2fs_nat_entry ne; } __packed; struct nat_journal { struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES]; __u8 reserved[NAT_JOURNAL_RESERVED]; } __packed; struct sit_journal_entry { __le32 segno; struct f2fs_sit_entry se; } __packed; struct sit_journal { struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES]; __u8 reserved[SIT_JOURNAL_RESERVED]; } __packed; /* 4KB-sized summary block structure */ struct f2fs_summary_block { struct f2fs_summary entries[ENTRIES_IN_SUM]; union { __le16 n_nats; __le16 n_sits; }; /* spare area is used by NAT or SIT journals */ union { struct nat_journal nat_j; struct sit_journal sit_j; }; struct summary_footer footer; } __packed; /* * For directory operations */ #define F2FS_DOT_HASH 0 #define F2FS_DDOT_HASH F2FS_DOT_HASH #define F2FS_MAX_HASH (~((0x3ULL) << 62)) #define F2FS_HASH_COL_BIT ((0x1ULL) << 63) typedef __le32 f2fs_hash_t; /* One directory entry slot covers 8bytes-long file name */ #define F2FS_SLOT_LEN 8 #define F2FS_SLOT_LEN_BITS 3 #define GET_DENTRY_SLOTS(x) ((x + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS) /* the number of dentry in a block */ #define NR_DENTRY_IN_BLOCK 214 /* MAX level for dir lookup */ #define MAX_DIR_HASH_DEPTH 63 #define SIZE_OF_DIR_ENTRY 11 /* by byte */ #define SIZE_OF_DENTRY_BITMAP ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \ BITS_PER_BYTE) #define SIZE_OF_RESERVED (PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \ F2FS_SLOT_LEN) * \ NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP)) /* One directory entry slot representing F2FS_SLOT_LEN-sized file name */ struct f2fs_dir_entry { __le32 hash_code; /* hash code of file name */ __le32 ino; /* inode number */ __le16 name_len; /* lengh of file name */ __u8 file_type; /* file type */ } __packed; /* 4KB-sized directory entry block */ struct f2fs_dentry_block { /* validity bitmap for directory entries in each block */ __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP]; __u8 reserved[SIZE_OF_RESERVED]; struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK]; __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN]; } __packed; /* file types used in inode_info->flags */ enum { F2FS_FT_UNKNOWN, F2FS_FT_REG_FILE, F2FS_FT_DIR, F2FS_FT_CHRDEV, F2FS_FT_BLKDEV, F2FS_FT_FIFO, F2FS_FT_SOCK, F2FS_FT_SYMLINK, F2FS_FT_MAX }; #endif /* _LINUX_F2FS_FS_H */