Commit 721f69c4 authored by Tao Ma's avatar Tao Ma Committed by Joel Becker
Browse files

ocfs2: Define refcount tree structure. 



Signed-off-by: default avatarTao Ma <tao.ma@oracle.com>
parent 5e404e9e

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)

{