1. const struct file_operations ext4_file_operations = {
    2.     .llseek        = ext4_llseek,
    3.     .read_iter    = ext4_file_read_iter,
    4.     .write_iter    = ext4_file_write_iter,
    5.     .unlocked_ioctl = ext4_ioctl,
    6. #ifdef CONFIG_COMPAT
    7.     .compat_ioctl    = ext4_compat_ioctl,
    8. #endif
    9.     .mmap        = ext4_file_mmap,
    10.     .mmap_supported_flags = MAP_SYNC,
    11.     .open        = ext4_file_open,
    12.     .release    = ext4_release_file,
    13.     .fsync        = ext4_sync_file,
    14.     .get_unmapped_area = thp_get_unmapped_area,
    15.     .splice_read    = generic_file_splice_read,
    16.     .splice_write    = iter_file_splice_write,
    17.     .fallocate    = ext4_fallocate,
    18. };
    20. const struct inode_operations ext4_file_inode_operations = {
    21.     .setattr    = ext4_setattr,
    22.     .getattr    = ext4_file_getattr,
    23.     .listxattr    = ext4_listxattr,
    24.     .get_acl    = ext4_get_acl,
    25.     .set_acl    = ext4_set_acl,
    26.     .fiemap        = ext4_fiemap,
    27. };
    29. struct ext4_inode {
    30.     __le16    i_mode;        /* File mode */
    31.     __le16    i_uid;        /* Low 16 bits of Owner Uid */
    32.     __le32    i_size_lo;    /* Size in bytes */
    33.     __le32    i_atime;    /* Access time */
    34.     __le32    i_ctime;    /* Inode Change time */
    35.     __le32    i_mtime;    /* Modification time */
    36.     __le32    i_dtime;    /* Deletion Time */
    37.     __le16    i_gid;        /* Low 16 bits of Group Id */
    38.     __le16    i_links_count;    /* Links count */
    39.     __le32    i_blocks_lo;    /* Blocks count */
    40.     __le32    i_flags;    /* File flags */
    41.     union {
    42.         struct {
    43.             __le32  l_i_version;
    44.         } linux1;
    45.         struct {
    46.             __u32  h_i_translator;
    47.         } hurd1;
    48.         struct {
    49.             __u32  m_i_reserved1;
    50.         } masix1;
    51.     } osd1;                /* OS dependent 1 */
    52.     __le32    i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
    53.     __le32    i_generation;    /* File version (for NFS) */
    54.     __le32    i_file_acl_lo;    /* File ACL */
    55.     __le32    i_size_high;
    56.     __le32    i_obso_faddr;    /* Obsoleted fragment address */
    57.     union {
    58.         struct {
    59.             __le16    l_i_blocks_high; /* were l_i_reserved1 */
    60.             __le16    l_i_file_acl_high;
    61.             __le16    l_i_uid_high;    /* these 2 fields */
    62.             __le16    l_i_gid_high;    /* were reserved2[0] */
    63.             __le16    l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
    64.             __le16    l_i_reserved;
    65.         } linux2;
    66.         struct {
    67.             __le16    h_i_reserved1;    /* Obsoleted fragment number/size which are removed in ext4 */
    68.             __u16    h_i_mode_high;
    69.             __u16    h_i_uid_high;
    70.             __u16    h_i_gid_high;
    71.             __u32    h_i_author;
    72.         } hurd2;
    73.         struct {
    74.             __le16    h_i_reserved1;    /* Obsoleted fragment number/size which are removed in ext4 */
    75.             __le16    m_i_file_acl_high;
    76.             __u32    m_i_reserved2[2];
    77.         } masix2;
    78.     } osd2;                /* OS dependent 2 */
    79.     __le16    i_extra_isize;
    80.     __le16    i_checksum_hi;    /* crc32c(uuid+inum+inode) BE */
    81.     __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
    82.     __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
    83.     __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
    84.     __le32  i_crtime;       /* File Creation time */
    85.     __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
    86.     __le32  i_version_hi;    /* high 32 bits for 64-bit version */
    87.     __le32    i_projid;    /* Project ID */
    88. };