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磁盘节点描述

/* * Structure of an inode on the disk */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;	/* Inode Change 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 */			__le16	m_i_file_acl_high;			__u32	m_i_reserved2[2];		} masix2;	} osd2;				/* OS dependent 2 */	__le16	i_extra_isize;	__le16	i_checksum_hi;	/* crc32c(uuid+inum+inode) BE */	__le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */	__le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */	__le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */	__le32  i_crtime;       /* File Creation time */	__le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */	__le32  i_version_hi;	/* high 32 bits for 64-bit version */	__le32	i_projid;	/* Project ID */};

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