| #ifndef __EXT2_FS_H |
| #define __EXT2_FS_H |
| |
| #include <stdint.h> |
| |
| #define EXT2_SUPER_MAGIC 0xEF53 |
| |
| #define EXT2_GOOD_OLD_REV 0 // The good old (original) format |
| #define EXT2_DYNAMIC_REV 1 // V2 format w/ dynamic inode sizes |
| #define EXT2_GOOD_OLD_INODE_SIZE 128 |
| |
| // Special inode numbers |
| #define EXT2_BAD_INO 1 // Bad blocks inode |
| #define EXT2_ROOT_INO 2 // Root inode |
| #define EXT2_BOOT_LOADER_INO 5 // Boot loader inode |
| #define EXT2_UNDEL_DIR_INO 6 // Undelete directory inode |
| #define EXT3_RESIZE_INO 7 // Reserved group descriptors inode |
| #define EXT3_JOURNAL_INO 8 // Journal inode |
| |
| // We're readonly, so we only care about incompat features. |
| #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 |
| #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 |
| #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 |
| #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 |
| #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 |
| #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff |
| |
| #define EXT2_NDIR_BLOCKS 12 |
| #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS |
| #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK+1) |
| #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK+1) |
| #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK+1) |
| |
| |
| /* for EXT4 extent */ |
| #define EXT4_EXT_MAGIC 0xf30a |
| #define EXT4_EXTENTS_FLAG 0x00080000 |
| |
| /* |
| * File types and file modes |
| */ |
| #define S_IFDIR 0040000 // Directory |
| #define S_IFCHR 0020000 // Character device |
| #define S_IFBLK 0060000 // Block device |
| #define S_IFREG 0100000 // Regular file |
| #define S_IFIFO 0010000 // FIFO |
| #define S_IFLNK 0120000 // Symbolic link |
| #define S_IFSOCK 0140000 // Socket |
| |
| #define S_IFSHIFT 12 |
| |
| #define T_IFDIR (S_IFDIR >> S_IFSHIFT) |
| #define T_IFCHR (S_IFCHR >> S_IFSHIFT) |
| #define T_IFBLK (S_IFBLK >> S_IFSHIFT) |
| #define T_IFREG (S_IFREG >> S_IFSHIFT) |
| #define T_IFIFO (S_IFIFO >> S_IFSHIFT) |
| #define T_IFLNK (S_IFLNK >> S_IFSHIFT) |
| #define T_IFSOCK (S_IFSOCK >> S_IFSHIFT) |
| |
| |
| #define ext2_group_desc_lg2size 5 |
| |
| |
| |
| /* |
| * super block structure: |
| * include/linux/ext2_fs.h |
| */ |
| struct ext2_super_block { |
| uint32_t s_inodes_count; /* Inodes count */ |
| uint32_t s_blocks_count; /* Blocks count */ |
| uint32_t s_r_blocks_count; /* Reserved blocks count */ |
| uint32_t s_free_blocks_count; /* Free blocks count */ |
| uint32_t s_free_inodes_count; /* Free inodes count */ |
| uint32_t s_first_data_block; /* First Data Block */ |
| uint32_t s_log_block_size; /* Block size */ |
| uint32_t s_log_frag_size; /* Fragment size */ |
| uint32_t s_blocks_per_group; /* # Blocks per group */ |
| uint32_t s_frags_per_group; /* # Fragments per group */ |
| uint32_t s_inodes_per_group; /* # Inodes per group */ |
| uint32_t s_mtime; /* Mount time */ |
| uint32_t s_wtime; /* Write time */ |
| uint16_t s_mnt_count; /* Mount count */ |
| int16_t s_max_mnt_count; /* Maximal mount count */ |
| uint16_t s_magic; /* Magic signature */ |
| uint16_t s_state; /* File system state */ |
| uint16_t s_errors; /* Behaviour when detecting errors */ |
| uint16_t s_minor_rev_level; |
| uint32_t s_lastcheck; /* time of last check */ |
| uint32_t s_checkinterval; /* max. time between checks */ |
| uint32_t s_creator_os; /* OS */ |
| uint32_t s_rev_level; /* Revision level */ |
| uint16_t s_def_resuid; /* Default uid for reserved blocks */ |
| uint16_t s_def_resgid; /* Default gid for reserved blocks */ |
| |
| uint32_t s_first_ino; /* First non-reserved inode */ |
| uint16_t s_inode_size; /* size of inode structure */ |
| uint16_t s_block_group_nr; /* block group # of this superblock */ |
| uint32_t s_feature_compat; /* compatible feature set */ |
| uint32_t s_feature_incompat; /* incompatible feature set */ |
| uint32_t s_feature_ro_compat; /* readonly-compatible feature set */ |
| uint8_t s_uuid[16]; /* 128-bit uuid for volume */ |
| char s_volume_name[16]; /* volume name */ |
| char s_last_mounted[64]; /* directory where last mounted */ |
| uint32_t s_algorithm_usage_bitmap; /* For compression */ |
| uint8_t s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ |
| uint8_t s_prealloc_dir_blocks; |
| uint16_t s_reserved_gdt_blocks; /* Per group desc for online growth */ |
| /* |
| * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. |
| */ |
| uint8_t s_journal_uuid[16]; /* uuid of journal superblock */ |
| uint32_t s_journal_inum; /* inode number of journal file */ |
| uint32_t s_journal_dev; /* device number of journal file */ |
| uint32_t s_last_orphan; /* start of list of inodes to delete */ |
| uint32_t s_hash_seed[4]; /* HTREE hash seed */ |
| uint8_t s_def_hash_version; /* Default hash version to use */ |
| uint8_t s_reserved_char_pad; |
| uint16_t s_desc_size; /* size of group descriptor */ |
| uint32_t s_default_mount_opts; |
| uint32_t s_first_meta_bg; /* First metablock block group */ |
| uint32_t s_mkfs_time; /* When the filesystem was created */ |
| uint32_t s_jnl_blocks[17]; /* Backup of the journal inode */ |
| /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ |
| uint32_t s_blocks_count_hi; /* Blocks count */ |
| uint32_t s_r_blocks_count_hi; /* Reserved blocks count */ |
| uint32_t s_free_blocks_count_hi;/* Free blocks count */ |
| uint16_t s_min_extra_isize; /* All inodes have at least # bytes */ |
| uint16_t s_want_extra_isize; /* New inodes should reserve # bytes */ |
| uint32_t s_flags; /* Miscellaneous flags */ |
| uint16_t s_raid_stride; /* RAID stride */ |
| uint16_t s_mmp_interval; /* # seconds to wait in MMP checking */ |
| uint64_t s_mmp_block; /* Block for multi-mount protection */ |
| uint32_t s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ |
| uint8_t s_log_groups_per_flex; /* FLEX_BG group size */ |
| uint8_t s_reserved_char_pad2; |
| uint16_t s_reserved_pad; |
| uint32_t s_reserved[162]; /* Padding to the end of the block */ |
| }; |
| |
| /******************************************************************************* |
| #ifndef DEPEND |
| #if ext2_super_block_size != 1024 |
| #error ext2_super_block definition bogus |
| #endif |
| #endif |
| *******************************************************************************/ |
| |
| /* |
| * ext2 group desc structure: |
| */ |
| struct ext2_group_desc { |
| uint32_t bg_block_bitmap; /* Blocks bitmap block */ |
| uint32_t bg_inode_bitmap; /* Inodes bitmap block */ |
| uint32_t bg_inode_table; /* Inodes table block */ |
| uint16_t bg_free_blocks_count; /* Free blocks count */ |
| uint16_t bg_free_inodes_count; /* Free inodes count */ |
| uint16_t bg_used_dirs_count; /* Directories count */ |
| uint16_t bg_pad; |
| uint32_t bg_reserved[3]; |
| }; |
| |
| /******************************************************************************* |
| #ifndef DEPEND |
| #if ext2_group_desc_size != 32 |
| #error ext2_group_desc definition bogus |
| #endif |
| #endif |
| *******************************************************************************/ |
| |
| |
| /* |
| * ext2 inode structure: |
| */ |
| struct ext2_inode { |
| uint16_t i_mode; /* File mode */ |
| uint16_t i_uid; /* Owner Uid */ |
| uint32_t i_size; /* 4: Size in bytes */ |
| uint32_t i_atime; /* Access time */ |
| uint32_t i_ctime; /* 12: Creation time */ |
| uint32_t i_mtime; /* Modification time */ |
| uint32_t i_dtime; /* 20: Deletion Time */ |
| uint16_t i_gid; /* Group Id */ |
| uint16_t i_links_count; /* 24: Links count */ |
| uint32_t i_blocks; /* Blocks count */ |
| uint32_t i_flags; /* 32: File flags */ |
| uint32_t l_i_reserved1; |
| uint32_t i_block[EXT2_N_BLOCKS]; /* 40: Pointers to blocks */ |
| uint32_t i_version; /* File version (for NFS) */ |
| uint32_t i_file_acl; /* File ACL */ |
| uint32_t i_dir_acl; /* Directory ACL */ |
| uint32_t i_faddr; /* Fragment address */ |
| uint8_t l_i_frag; /* Fragment number */ |
| uint8_t l_i_fsize; /* Fragment size */ |
| uint16_t i_pad1; |
| uint32_t l_i_reserved2[2]; |
| }; |
| |
| /******************************************************************************* |
| #ifndef DEPEND |
| #if ext2_inode_size != 128 |
| #error ext2_inode definition bogus |
| #endif |
| #endif |
| *******************************************************************************/ |
| |
| |
| #define EXT2_NAME_LEN 255 |
| struct ext2_dir_entry { |
| unsigned int d_inode; /* Inode number */ |
| unsigned short d_rec_len; /* Directory entry length */ |
| unsigned char d_name_len; /* Name length */ |
| unsigned char d_file_type; |
| char d_name[EXT2_NAME_LEN]; /* File name */ |
| }; |
| |
| /******************************************************************************* |
| #define EXT2_DIR_PAD 4 |
| #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) |
| #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ |
| ~EXT2_DIR_ROUND) |
| *******************************************************************************/ |
| |
| |
| |
| |
| |
| |
| /* |
| * This is the extent on-disk structure. |
| * It's used at the bottom of the tree. |
| */ |
| struct ext4_extent { |
| uint32_t ee_block; /* first logical block extent covers */ |
| uint16_t ee_len; /* number of blocks covered by extent */ |
| uint16_t ee_start_hi; /* high 16 bits of physical block */ |
| uint32_t ee_start_lo; /* low 32 bits of physical block */ |
| }; |
| |
| /* |
| * This is index on-disk structure. |
| * It's used at all the levels except the bottom. |
| */ |
| struct ext4_extent_idx { |
| uint32_t ei_block; /* index covers logical blocks from 'block' */ |
| uint32_t ei_leaf_lo; /* pointer to the physical block of the next * |
| * level. leaf or next index could be there */ |
| uint16_t ei_leaf_hi; /* high 16 bits of physical block */ |
| uint16_t ei_unused; |
| }; |
| |
| /* |
| * Each block (leaves and indexes), even inode-stored has header. |
| */ |
| struct ext4_extent_header { |
| uint16_t eh_magic; /* probably will support different formats */ |
| uint16_t eh_entries; /* number of valid entries */ |
| uint16_t eh_max; /* capacity of store in entries */ |
| uint16_t eh_depth; /* has tree real underlying blocks? */ |
| uint32_t eh_generation; /* generation of the tree */ |
| }; |
| |
| |
| |
| #define EXT4_FIRST_EXTENT(header) ( (struct ext4_extent *)(header + 1) ) |
| #define EXT4_FIRST_INDEX(header) ( (struct ext4_extent_idx *) (header + 1) ) |
| |
| |
| /* |
| * The ext2 super block information in memory |
| */ |
| struct ext2_sb_info { |
| uint32_t s_inodes_per_block;/* Number of inodes per block */ |
| uint32_t s_inodes_per_group;/* Number of inodes in a group */ |
| uint32_t s_blocks_per_group;/* Number of blocks in a group */ |
| uint32_t s_desc_per_block; /* Number of group descriptors per block */ |
| uint32_t s_groups_count; /* Number of groups in the fs */ |
| uint32_t s_first_data_block; /* First Data Block */ |
| int s_inode_size; |
| uint8_t s_uuid[16]; /* 128-bit uuid for volume */ |
| }; |
| |
| static inline struct ext2_sb_info *EXT2_SB(struct fs_info *fs) |
| { |
| return fs->fs_info; |
| } |
| |
| #define EXT2_BLOCKS_PER_GROUP(fs) (EXT2_SB(fs)->s_blocks_per_group) |
| #define EXT2_INODES_PER_GROUP(fs) (EXT2_SB(fs)->s_inodes_per_group) |
| #define EXT2_INODES_PER_BLOCK(fs) (EXT2_SB(fs)->s_inodes_per_block) |
| #define EXT2_DESC_PER_BLOCK(fs) (EXT2_SB(fs)->s_desc_per_block) |
| |
| /* |
| * ext2 private inode information |
| */ |
| struct ext2_pvt_inode { |
| union { |
| uint32_t i_block[EXT2_N_BLOCKS]; |
| struct ext4_extent_header i_extent_hdr; |
| }; |
| }; |
| |
| #define PVT(i) ((struct ext2_pvt_inode *)((i)->pvt)) |
| |
| /* |
| * functions |
| */ |
| block_t ext2_bmap(struct inode *, block_t, size_t *); |
| int ext2_next_extent(struct inode *, uint32_t); |
| |
| #endif /* ext2_fs.h */ |
