ext4_utils/ext4.h - fp2-dev/platform/system/extras - Gitiles

 /****************************************************************************
  ****************************************************************************
  ***
  ***   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_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_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_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
	/****************************************************************************
	****************************************************************************
	***
	*** 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_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_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_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