ext4.h

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/****************************************************************************
 ****************************************************************************
 ***
 ***   This header was automatically generated from a Linux kernel header
 ***   of the same name, to make information necessary for userspace to
 ***   call into the kernel available to libc.  It contains only constants,
 ***   structures, and macros generated from the original header, and thus,
 ***   contains no copyrightable information.
 ***
 ****************************************************************************
 ****************************************************************************/
#ifndef _EXT4_H
#define _EXT4_H
 
#include <sys/types.h>
 
#undef EXT4FS_DEBUG
 
#ifdef EXT4FS_DEBUG
#define ext4_debug(f, a...)                                                             \
    do {                                                                                \
        printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", __FILE__, __LINE__, __func__); \
        printk(KERN_DEBUG f, ##a);                                                      \
    } while (0)
#else
#define ext4_debug(f, a...) \
    do {                    \
    } while (0)
#endif
 
#define EXT4_ERROR_INODE(inode, fmt, a...) ext4_error_inode(__func__, (inode), (fmt), ##a);
 
#define EXT4_ERROR_FILE(file, fmt, a...) ext4_error_file(__func__, (file), (fmt), ##a);
 
typedef int ext4_grpblk_t;
 
typedef unsigned long long ext4_fsblk_t;
 
typedef __u32 ext4_lblk_t;
 
typedef unsigned int ext4_group_t;
 
#define EXT4_MB_HINT_MERGE 0x0001
 
#define EXT4_MB_HINT_RESERVED 0x0002
 
#define EXT4_MB_HINT_METADATA 0x0004
 
#define EXT4_MB_HINT_FIRST 0x0008
 
#define EXT4_MB_HINT_BEST 0x0010
 
#define EXT4_MB_HINT_DATA 0x0020
 
#define EXT4_MB_HINT_NOPREALLOC 0x0040
 
#define EXT4_MB_HINT_GROUP_ALLOC 0x0080
 
#define EXT4_MB_HINT_GOAL_ONLY 0x0100
 
#define EXT4_MB_HINT_TRY_GOAL 0x0200
 
#define EXT4_MB_DELALLOC_RESERVED 0x0400
 
#define EXT4_MB_STREAM_ALLOC 0x0800
 
struct ext4_allocation_request {
    struct inode* inode;
 
    unsigned int len;
 
    ext4_lblk_t logical;
 
    ext4_lblk_t lleft;
 
    ext4_lblk_t lright;
 
    ext4_fsblk_t goal;
 
    ext4_fsblk_t pleft;
 
    ext4_fsblk_t pright;
 
    unsigned int flags;
};
 
#define EXT4_BAD_INO 1
#define EXT4_ROOT_INO 2
#define EXT4_BOOT_LOADER_INO 5
#define EXT4_UNDEL_DIR_INO 6
#define EXT4_RESIZE_INO 7
#define EXT4_JOURNAL_INO 8
 
#define EXT4_GOOD_OLD_FIRST_INO 11
 
#define EXT4_LINK_MAX 65000
 
#define EXT4_MIN_BLOCK_SIZE 1024
#define EXT4_MAX_BLOCK_SIZE 65536
#define EXT4_MIN_BLOCK_LOG_SIZE 10
#define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
#define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
#define EXT4_INODE_SIZE(s) \
    (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? EXT4_GOOD_OLD_INODE_SIZE : (s)->s_inode_size)
#define EXT4_FIRST_INO(s) \
    (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? EXT4_GOOD_OLD_FIRST_INO : (s)->s_first_ino)
#define EXT4_BLOCK_ALIGN(size, blkbits) EXT4_ALIGN((size), (1 << (blkbits)))
 
struct ext4_group_desc {
    __le32 bg_block_bitmap_lo;
    __le32 bg_inode_bitmap_lo;
    __le32 bg_inode_table_lo;
    __le16 bg_free_blocks_count_lo;
    __le16 bg_free_inodes_count_lo;
    __le16 bg_used_dirs_count_lo;
    __le16 bg_flags;
    __u32 bg_reserved[2];
    __le16 bg_itable_unused_lo;
    __le16 bg_checksum;
    __le32 bg_block_bitmap_hi;
    __le32 bg_inode_bitmap_hi;
    __le32 bg_inode_table_hi;
    __le16 bg_free_blocks_count_hi;
    __le16 bg_free_inodes_count_hi;
    __le16 bg_used_dirs_count_hi;
    __le16 bg_itable_unused_hi;
    __u32 bg_reserved2[3];
};
 
#define EXT4_BG_INODE_UNINIT 0x0001
#define EXT4_BG_BLOCK_UNINIT 0x0002
#define EXT4_BG_INODE_ZEROED 0x0004
 
#define EXT4_MIN_DESC_SIZE 32
#define EXT4_MIN_DESC_SIZE_64BIT 64
#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
#define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
#define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
#define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
 
#define EXT4_NDIR_BLOCKS 12
#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
 
#define EXT4_SECRM_FL 0x00000001
#define EXT4_UNRM_FL 0x00000002
#define EXT4_COMPR_FL 0x00000004
#define EXT4_SYNC_FL 0x00000008
#define EXT4_IMMUTABLE_FL 0x00000010
#define EXT4_APPEND_FL 0x00000020
#define EXT4_NODUMP_FL 0x00000040
#define EXT4_NOATIME_FL 0x00000080
 
#define EXT4_DIRTY_FL 0x00000100
#define EXT4_COMPRBLK_FL 0x00000200
#define EXT4_NOCOMPR_FL 0x00000400
#define EXT4_ECOMPR_FL 0x00000800
 
#define EXT4_INDEX_FL 0x00001000
#define EXT4_IMAGIC_FL 0x00002000
#define EXT4_JOURNAL_DATA_FL 0x00004000
#define EXT4_NOTAIL_FL 0x00008000
#define EXT4_DIRSYNC_FL 0x00010000
#define EXT4_TOPDIR_FL 0x00020000
#define EXT4_HUGE_FILE_FL 0x00040000
#define EXT4_EXTENTS_FL 0x00080000
#define EXT4_EA_INODE_FL 0x00200000
#define EXT4_EOFBLOCKS_FL 0x00400000
#define EXT4_RESERVED_FL 0x80000000
 
#define EXT4_FL_USER_VISIBLE 0x004BDFFF
#define EXT4_FL_USER_MODIFIABLE 0x004B80FF
 
#define EXT4_FL_INHERITED                                                                         \
    (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL | EXT4_SYNC_FL | EXT4_IMMUTABLE_FL |            \
     EXT4_APPEND_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL | EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL | \
     EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
 
#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
 
#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 
struct ext4_new_group_data {
    __u32 group;
    __u64 block_bitmap;
    __u64 inode_bitmap;
    __u64 inode_table;
    __u32 blocks_count;
    __u16 reserved_blocks;
    __u16 unused;
    __u32 free_blocks_count;
};
 
#define EXT4_GET_BLOCKS_CREATE 0x0001
 
#define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
#define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT | EXT4_GET_BLOCKS_CREATE)
 
#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
 
#define EXT4_GET_BLOCKS_PRE_IO 0x0008
#define EXT4_GET_BLOCKS_CONVERT 0x0010
#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO | EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
 
#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT | EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
 
#define EXT4_FREE_BLOCKS_METADATA 0x0001
#define EXT4_FREE_BLOCKS_FORGET 0x0002
#define EXT4_FREE_BLOCKS_VALIDATED 0x0004
 
#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
#define EXT4_IOC_MIGRATE _IO('f', 9)
 
#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
 
#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
 
#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
 
struct ext4_inode {
    __le16 i_mode;
    __le16 i_uid;
    __le32 i_size_lo;
    __le32 i_atime;
    __le32 i_ctime;
    __le32 i_mtime;
    __le32 i_dtime;
    __le16 i_gid;
    __le16 i_links_count;
    __le32 i_blocks_lo;
    __le32 i_flags;
    union {
        struct {
            __le32 l_i_version;
        } linux1;
        struct {
            __u32 h_i_translator;
        } hurd1;
        struct {
            __u32 m_i_reserved1;
        } masix1;
    } osd1;
    __le32 i_block[EXT4_N_BLOCKS];
    __le32 i_generation;
    __le32 i_file_acl_lo;
    __le32 i_size_high;
    __le32 i_obso_faddr;
    union {
        struct {
            __le16 l_i_blocks_high;
            __le16 l_i_file_acl_high;
            __le16 l_i_uid_high;
            __le16 l_i_gid_high;
            __u32 l_i_reserved2;
        } linux2;
        struct {
            __le16 h_i_reserved1;
            __u16 h_i_mode_high;
            __u16 h_i_uid_high;
            __u16 h_i_gid_high;
            __u32 h_i_author;
        } hurd2;
        struct {
            __le16 h_i_reserved1;
            __le16 m_i_file_acl_high;
            __u32 m_i_reserved2[2];
        } masix2;
    } osd2;
    __le16 i_extra_isize;
    __le16 i_pad1;
    __le32 i_ctime_extra;
    __le32 i_mtime_extra;
    __le32 i_atime_extra;
    __le32 i_crtime;
    __le32 i_crtime_extra;
    __le32 i_version_hi;
};
 
struct move_extent {
    __u32 reserved;
    __u32 donor_fd;
    __u64 orig_start;
    __u64 donor_start;
    __u64 len;
    __u64 moved_len;
};
 
#define EXT4_EPOCH_BITS 2
#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
 
#define EXT4_FITS_IN_INODE(ext4_inode, einode, field)                          \
    ((offsetof(typeof(*(ext4_inode)), field) + sizeof((ext4_inode)->field)) <= \
     (EXT4_GOOD_OLD_INODE_SIZE + (einode)->i_extra_isize))
#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                             \
    do {                                                                          \
        (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);                  \
        if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime##_extra))          \
            (raw_inode)->xtime##_extra = ext4_encode_extra_time(&(inode)->xtime); \
    } while (0)
#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                            \
    do {                                                                           \
        if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                          \
            (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);              \
        if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime##_extra))                  \
            (raw_inode)->xtime##_extra = ext4_encode_extra_time(&(einode)->xtime); \
    } while (0)
#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                            \
    do {                                                                         \
        (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);         \
        if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime##_extra))         \
            ext4_decode_extra_time(&(inode)->xtime, (raw_inode)->xtime##_extra); \
    } while (0)
 
#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                           \
    do {                                                                          \
        if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                         \
            (einode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);     \
        if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime##_extra))                 \
            ext4_decode_extra_time(&(einode)->xtime, (raw_inode)->xtime##_extra); \
    } while (0)
#define i_disk_version osd1.linux1.l_i_version
 
#define i_reserved1 osd1.linux1.l_i_reserved1
#define i_file_acl_high osd2.linux2.l_i_file_acl_high
#define i_blocks_high osd2.linux2.l_i_blocks_high
#define i_uid_low i_uid
#define i_gid_low i_gid
#define i_uid_high osd2.linux2.l_i_uid_high
#define i_gid_high osd2.linux2.l_i_gid_high
#define i_reserved2 osd2.linux2.l_i_reserved2
 
#define EXT4_VALID_FS 0x0001
#define EXT4_ERROR_FS 0x0002
#define EXT4_ORPHAN_FS 0x0004
 
#define EXT2_FLAGS_SIGNED_HASH 0x0001
#define EXT2_FLAGS_UNSIGNED_HASH 0x0002
#define EXT2_FLAGS_TEST_FILESYS 0x0004
 
#define EXT4_MOUNT_OLDALLOC 0x00002
#define EXT4_MOUNT_GRPID 0x00004
#define EXT4_MOUNT_DEBUG 0x00008
#define EXT4_MOUNT_ERRORS_CONT 0x00010
#define EXT4_MOUNT_ERRORS_RO 0x00020
#define EXT4_MOUNT_ERRORS_PANIC 0x00040
#define EXT4_MOUNT_MINIX_DF 0x00080
#define EXT4_MOUNT_NOLOAD 0x00100
#define EXT4_MOUNT_DATA_FLAGS 0x00C00
#define EXT4_MOUNT_JOURNAL_DATA 0x00400
#define EXT4_MOUNT_ORDERED_DATA 0x00800
#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00
#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000
#define EXT4_MOUNT_NO_UID32 0x02000
#define EXT4_MOUNT_XATTR_USER 0x04000
#define EXT4_MOUNT_POSIX_ACL 0x08000
#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000
#define EXT4_MOUNT_BARRIER 0x20000
#define EXT4_MOUNT_NOBH 0x40000
#define EXT4_MOUNT_QUOTA 0x80000
#define EXT4_MOUNT_USRQUOTA 0x100000
#define EXT4_MOUNT_GRPQUOTA 0x200000
#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000
#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000
#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000
#define EXT4_MOUNT_I_VERSION 0x2000000
#define EXT4_MOUNT_DELALLOC 0x8000000
#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000
#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000
#define EXT4_MOUNT_DISCARD 0x40000000
 
#define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
#define set_opt(o, opt) o |= EXT4_MOUNT_##opt
#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & EXT4_MOUNT_##opt)
 
#define ext4_set_bit ext2_set_bit
#define ext4_set_bit_atomic ext2_set_bit_atomic
#define ext4_clear_bit ext2_clear_bit
#define ext4_clear_bit_atomic ext2_clear_bit_atomic
#define ext4_test_bit ext2_test_bit
#define ext4_find_first_zero_bit ext2_find_first_zero_bit
#define ext4_find_next_zero_bit ext2_find_next_zero_bit
#define ext4_find_next_bit ext2_find_next_bit
 
#define EXT4_DFL_MAX_MNT_COUNT 20
#define EXT4_DFL_CHECKINTERVAL 0
 
#define EXT4_ERRORS_CONTINUE 1
#define EXT4_ERRORS_RO 2
#define EXT4_ERRORS_PANIC 3
#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
 
struct ext4_super_block {
    __le32 s_inodes_count;
    __le32 s_blocks_count_lo;
    __le32 s_r_blocks_count_lo;
    __le32 s_free_blocks_count_lo;
    __le32 s_free_inodes_count;
    __le32 s_first_data_block;
    __le32 s_log_block_size;
    __le32 s_obso_log_frag_size;
    __le32 s_blocks_per_group;
    __le32 s_obso_frags_per_group;
    __le32 s_inodes_per_group;
    __le32 s_mtime;
    __le32 s_wtime;
    __le16 s_mnt_count;
    __le16 s_max_mnt_count;
    __le16 s_magic;
    __le16 s_state;
    __le16 s_errors;
    __le16 s_minor_rev_level;
    __le32 s_lastcheck;
    __le32 s_checkinterval;
    __le32 s_creator_os;
    __le32 s_rev_level;
    __le16 s_def_resuid;
    __le16 s_def_resgid;
 
    __le32 s_first_ino;
    __le16 s_inode_size;
    __le16 s_block_group_nr;
    __le32 s_feature_compat;
    __le32 s_feature_incompat;
    __le32 s_feature_ro_compat;
    __u8 s_uuid[16];
    char s_volume_name[16];
    char s_last_mounted[64];
    __le32 s_algorithm_usage_bitmap;
 
    __u8 s_prealloc_blocks;
    __u8 s_prealloc_dir_blocks;
    __le16 s_reserved_gdt_blocks;
 
    __u8 s_journal_uuid[16];
    __le32 s_journal_inum;
    __le32 s_journal_dev;
    __le32 s_last_orphan;
    __le32 s_hash_seed[4];
    __u8 s_def_hash_version;
    __u8 s_reserved_char_pad;
    __le16 s_desc_size;
    __le32 s_default_mount_opts;
    __le32 s_first_meta_bg;
    __le32 s_mkfs_time;
    __le32 s_jnl_blocks[17];
 
    __le32 s_blocks_count_hi;
    __le32 s_r_blocks_count_hi;
    __le32 s_free_blocks_count_hi;
    __le16 s_min_extra_isize;
    __le16 s_want_extra_isize;
    __le32 s_flags;
    __le16 s_raid_stride;
    __le16 s_mmp_interval;
    __le64 s_mmp_block;
    __le32 s_raid_stripe_width;
    __u8 s_log_groups_per_flex;
    __u8 s_reserved_char_pad2;
    __le16 s_reserved_pad;
    __le64 s_kbytes_written;
    __u32 s_reserved[160];
};
 
#define EXT4_SB(sb) (sb)
 
#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
 
#define EXT4_OS_LINUX 0
#define EXT4_OS_HURD 1
#define EXT4_OS_MASIX 2
#define EXT4_OS_FREEBSD 3
#define EXT4_OS_LITES 4
 
#define EXT4_GOOD_OLD_REV 0
#define EXT4_DYNAMIC_REV 1
 
#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
 
#define EXT4_GOOD_OLD_INODE_SIZE 128
 
#define EXT4_HAS_COMPAT_FEATURE(sb, mask) \
    ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
#define EXT4_HAS_RO_COMPAT_FEATURE(sb, mask) \
    ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
#define EXT4_HAS_INCOMPAT_FEATURE(sb, mask) \
    ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
#define EXT4_SET_COMPAT_FEATURE(sb, mask) EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
#define EXT4_SET_RO_COMPAT_FEATURE(sb, mask) \
    EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
#define EXT4_SET_INCOMPAT_FEATURE(sb, mask) \
    EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
#define EXT4_CLEAR_COMPAT_FEATURE(sb, mask) \
    EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb, mask) \
    EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
#define EXT4_CLEAR_INCOMPAT_FEATURE(sb, mask) \
    EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
 
#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
#define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800
 
#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
#define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x0080
#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
#define EXT4_FEATURE_RO_COMPAT_SHARED_BLOCKS 0x4000
#define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000
 
#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004
#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040
#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400
#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000
#define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
#define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000
 
#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
#define EXT4_FEATURE_INCOMPAT_SUPP                                                                 \
    (EXT4_FEATURE_INCOMPAT_FILETYPE | EXT4_FEATURE_INCOMPAT_RECOVER |                              \
     EXT4_FEATURE_INCOMPAT_META_BG | EXT4_FEATURE_INCOMPAT_EXTENTS | EXT4_FEATURE_INCOMPAT_64BIT | \
     EXT4_FEATURE_INCOMPAT_FLEX_BG)
#define EXT4_FEATURE_RO_COMPAT_SUPP                                            \
    (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER | EXT4_FEATURE_RO_COMPAT_LARGE_FILE | \
     EXT4_FEATURE_RO_COMPAT_GDT_CSUM | EXT4_FEATURE_RO_COMPAT_DIR_NLINK |      \
     EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | EXT4_FEATURE_RO_COMPAT_BTREE_DIR |   \
     EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
 
#define EXT4_DEF_RESUID 0
#define EXT4_DEF_RESGID 0
 
#define EXT4_DEF_INODE_READAHEAD_BLKS 32
 
#define EXT4_DEFM_DEBUG 0x0001
#define EXT4_DEFM_BSDGROUPS 0x0002
#define EXT4_DEFM_XATTR_USER 0x0004
#define EXT4_DEFM_ACL 0x0008
#define EXT4_DEFM_UID16 0x0010
#define EXT4_DEFM_JMODE 0x0060
#define EXT4_DEFM_JMODE_DATA 0x0020
#define EXT4_DEFM_JMODE_ORDERED 0x0040
#define EXT4_DEFM_JMODE_WBACK 0x0060
 
#define EXT4_DEF_MIN_BATCH_TIME 0
#define EXT4_DEF_MAX_BATCH_TIME 15000
 
#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
 
#define EXT4_NAME_LEN 255
 
struct ext4_dir_entry {
    __le32 inode;
    __le16 rec_len;
    __le16 name_len;
    char name[EXT4_NAME_LEN];
};
 
struct ext4_dir_entry_2 {
    __le32 inode;
    __le16 rec_len;
    __u8 name_len;
    __u8 file_type;
    char name[EXT4_NAME_LEN];
};
 
#define EXT4_FT_UNKNOWN 0
#define EXT4_FT_REG_FILE 1
#define EXT4_FT_DIR 2
#define EXT4_FT_CHRDEV 3
#define EXT4_FT_BLKDEV 4
#define EXT4_FT_FIFO 5
#define EXT4_FT_SOCK 6
#define EXT4_FT_SYMLINK 7
 
#define EXT4_FT_MAX 8
 
#define EXT4_DIR_PAD 4
#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND)
#define EXT4_MAX_REC_LEN ((1 << 16) - 1)
 
#define is_dx(dir)                                                          \
    (EXT4_HAS_COMPAT_FEATURE((dir)->i_sb, EXT4_FEATURE_COMPAT_DIR_INDEX) && \
     (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
 
#define DX_HASH_LEGACY 0
#define DX_HASH_HALF_MD4 1
#define DX_HASH_TEA 2
#define DX_HASH_LEGACY_UNSIGNED 3
#define DX_HASH_HALF_MD4_UNSIGNED 4
#define DX_HASH_TEA_UNSIGNED 5
 
#endif