查看ext4 文件系统的 Inode 结构体

ext4文件系统的Inode结构体定义在内核源代码中的`include/linux/ext4_fs.h`文件中。

其结构体定义如下：

struct ext4_inode {
    __le16  i_mode;     /* File mode */
    __le16  i_uid;      /* Low 16 bits of Owner Uid */
    __le32  i_size_lo;  /* Size in bytes */
    __le32  i_atime;    /* Access time */
    __le32  i_ctime;    /* Creation time */
    __le32  i_mtime;    /* Modification time */
    __le32  i_dtime;    /* Deletion Time */
    __le16  i_gid;      /* Low 16 bits of Group Id */
    __le16  i_links_count;  /* Links count */
    __le32  i_blocks_lo;    /* Blocks count */
    __le32  i_flags;    /* File flags */
    union {
        struct {
            __le32  l_i_version;
        } linux1;
        struct {
            __u32  h_i_translator;
        } hurd1;
        struct {
            __u32  m_i_reserved1;
        } masix1;
    } osd1;             /* OS dependent 1 */
    __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
    __le32  i_generation;  /* File version (for NFS) */
    __le32  i_file_acl_lo; /* File ACL */
    __le32  i_size_high;
    __le32  i_obso_faddr;  /* Obsoleted fragment address */
    union {
        struct {
            __le16  l_i_blocks_high; /* were l_i_reserved1 */
            __le16  l_i_file_acl_high;
            __le16  l_i_uid_high;   /* these 2 fields */
            __le16  l_i_gid_high;   /* were reserved2[0] */
            __le16  l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
            __le16  l_i_reserved;
        } linux2;
        struct {
            __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
            __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;  /* Obsoleted fragment number/size which are removed in ext4 */
            __u16   m_i_file_acl_high;
            __u32   m_i_reserved2[1];
        } masix2;
    } osd2;             /* OS dependent 2 */
};

可以看到，`ext4_inode`结构体包含了文件的基本属性信息，如文件大小、文件类型、访问、修改和创建时间、文件所属用户和组、文件权限等。此外，还包含了指向文件内容的指针、文件所在的磁盘块号、文件版本号、文件ACL等信息。