ocfs2: Define refcount tree structure. (721f69c4) · Commits · 戴 / test

fs/ocfs2/ocfs2_fs.h

+85 −3

Original line number	Diff line number	Diff line
		@@ -68,6 +68,7 @@
		#define OCFS2_DIR_TRAILER_SIGNATURE "DIRTRL1"
		#define OCFS2_DX_ROOT_SIGNATURE "DXDIR01"
		#define OCFS2_DX_LEAF_SIGNATURE "DXLEAF1"
		#define OCFS2_REFCOUNT_BLOCK_SIGNATURE "REFCNT1"

		/* Compatibility flags */
		#define OCFS2_HAS_COMPAT_FEATURE(sb,mask) \
		@@ -160,6 +161,9 @@
		/* Metadata checksum and error correction */
		#define OCFS2_FEATURE_INCOMPAT_META_ECC 0x0800

		/* Refcount tree support */
		#define OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE 0x1000

		/*
		* backup superblock flag is used to indicate that this volume
		* has backup superblocks.
		@@ -223,6 +227,7 @@
		#define OCFS2_HAS_XATTR_FL (0x0002)
		#define OCFS2_INLINE_XATTR_FL (0x0004)
		#define OCFS2_INDEXED_DIR_FL (0x0008)
		#define OCFS2_HAS_REFCOUNT_FL (0x0010)

		/* Inode attributes, keep in sync with EXT2 */
		#define OCFS2_SECRM_FL (0x00000001) /* Secure deletion */
		@@ -243,6 +248,9 @@
		*/
		#define OCFS2_EXT_UNWRITTEN (0x01) /* Extent is allocated but
		* unwritten */
		#define OCFS2_EXT_REFCOUNTED (0x02) /* Extent is reference
		* counted in an associated
		* refcount tree */

		/*
		* ioctl commands
		@@ -717,7 +725,8 @@ struct ocfs2_dinode {
		__le64 i_xattr_loc;
		/80/ struct ocfs2_block_check i_check; /* Error checking */
		/88/ __le64 i_dx_root; /* Pointer to dir index root block */
		__le64 i_reserved2[5];
		/90/ __le64 i_refcount_loc;
		__le64 i_reserved2[4];
		/B8/ union {
		__le64 i_pad1; /* Generic way to refer to this
		64bit union */
		@@ -901,6 +910,59 @@ struct ocfs2_group_desc
		/40/ __u8 bg_bitmap[0];
		};

		struct ocfs2_refcount_rec {
		/00/ __le64 r_cpos; /* Physical offset, in clusters */
		__le32 r_clusters; /* Clusters covered by this extent */
		__le32 r_refcount; /* Reference count of this extent */
		/10/
		};

		#define OCFS2_REFCOUNT_LEAF_FL (0x00000001)
		#define OCFS2_REFCOUNT_TREE_FL (0x00000002)

		struct ocfs2_refcount_list {
		/00/ __le16 rl_count; /* Maximum number of entries possible
		in rl_records */
		__le16 rl_used; /* Current number of used records */
		__le32 rl_reserved2;
		__le64 rl_reserved1; /* Pad to sizeof(ocfs2_refcount_record) */
		/10/ struct ocfs2_refcount_rec rl_recs[0]; /* Refcount records */
		};


		struct ocfs2_refcount_block {
		/00/ __u8 rf_signature[8]; /* Signature for verification */
		__le16 rf_suballoc_slot; /* Slot suballocator this block
		belongs to */
		__le16 rf_suballoc_bit; /* Bit offset in suballocator
		block group */
		__le32 rf_fs_generation; /* Must match superblock */
		/10/ __le64 rf_blkno; /* Offset on disk, in blocks */
		__le64 rf_parent; /* Parent block, only valid if
		OCFS2_REFCOUNT_LEAF_FL is set in
		rf_flags */
		/20/ struct ocfs2_block_check rf_check; /* Error checking */
		__le64 rf_last_eb_blk; /* Pointer to last extent block */
		/30/ __le32 rf_count; /* Number of inodes sharing this
		refcount tree */
		__le32 rf_flags; /* See the flags above */
		__le32 rf_clusters; /* clusters covered by refcount tree. */
		__le32 rf_cpos; /* cluster offset in refcount tree.*/
		/40/ __le32 rf_generation; /* generation number. all be the same
		* for the same refcount tree. */
		__le32 rf_reserved0;
		__le64 rf_reserved1[7];
		/80/ union {
		struct ocfs2_refcount_list rf_records; /* List of refcount
		records */
		struct ocfs2_extent_list rf_list; /* Extent record list,
		only valid if
		OCFS2_REFCOUNT_TREE_FL
		is set in rf_flags */
		};
		/* Actual on-disk size is one block */
		};

		/*
		* On disk extended attribute structure for OCFS2.
		*/
		@@ -1312,6 +1374,26 @@ static inline u16 ocfs2_xattr_recs_per_xb(struct super_block *sb)

		return size / sizeof(struct ocfs2_extent_rec);
		}

		static inline u16 ocfs2_extent_recs_per_rb(struct super_block *sb)
		{
		int size;

		size = sb->s_blocksize -
		offsetof(struct ocfs2_refcount_block, rf_list.l_recs);

		return size / sizeof(struct ocfs2_extent_rec);
		}

		static inline u16 ocfs2_refcount_recs_per_rb(struct super_block *sb)
		{
		int size;

		size = sb->s_blocksize -
		offsetof(struct ocfs2_refcount_block, rf_records.rl_recs);

		return size / sizeof(struct ocfs2_refcount_rec);
		}
		#else
		static inline int ocfs2_fast_symlink_chars(int blocksize)
		{

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