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Commit c611cc03 authored by Darrick J. Wong's avatar Darrick J. Wong Committed by Dave Chinner
Browse files

xfs: count the blocks in a btree 



Provide a helper method to count the number of blocks in a short form
btree.  The refcount and rmap btrees need to know the number of blocks
already in use to set up their per-AG block reservations during mount.

Signed-off-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarDave Chinner <david@fromorbit.com>
parent 4ed3f687

fs/xfs/libxfs/xfs_btree.c

+23 −0
Original line number Diff line number Diff line
@@ -4821,3 +4821,26 @@ xfs_btree_calc_size( 
	}

	return rval;

}



int

xfs_btree_count_blocks_helper(

	struct xfs_btree_cur	*cur,

	int			level,

	void			*data)

{

	xfs_extlen_t		*blocks = data;

	(*blocks)++;



	return 0;

}



/* Count the blocks in a btree and return the result in *blocks. */

int

xfs_btree_count_blocks(

	struct xfs_btree_cur	*cur,

	xfs_extlen_t		*blocks)

{

	*blocks = 0;

	return xfs_btree_visit_blocks(cur, xfs_btree_count_blocks_helper,

			blocks);

}

fs/xfs/libxfs/xfs_btree.h

+2 −0
Original line number Diff line number Diff line
@@ -519,4 +519,6 @@ typedef int (*xfs_btree_visit_blocks_fn)(struct xfs_btree_cur *cur, int level, 
int xfs_btree_visit_blocks(struct xfs_btree_cur *cur,

		xfs_btree_visit_blocks_fn fn, void *data);



int xfs_btree_count_blocks(struct xfs_btree_cur *cur, xfs_extlen_t *blocks);



#endif	/* __XFS_BTREE_H__ */