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Commit 4ed3f687 authored by Darrick J. Wong's avatar Darrick J. Wong Committed by Dave Chinner
Browse files

xfs: create a standard btree size calculator code



Create a helper to generate AG btree height calculator functions.
This will be used (much) later when we get to the refcount btree.

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 a1d46cff
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+24 −0
Original line number Original line Diff line number Diff line
@@ -4797,3 +4797,27 @@ xfs_btree_query_range(
	return xfs_btree_overlapped_query_range(cur, &low_key, &high_key,
	return xfs_btree_overlapped_query_range(cur, &low_key, &high_key,
			fn, priv);
			fn, priv);
}
}

/*
 * Calculate the number of blocks needed to store a given number of records
 * in a short-format (per-AG metadata) btree.
 */
xfs_extlen_t
xfs_btree_calc_size(
	struct xfs_mount	*mp,
	uint			*limits,
	unsigned long long	len)
{
	int			level;
	int			maxrecs;
	xfs_extlen_t		rval;

	maxrecs = limits[0];
	for (level = 0, rval = 0; len > 1; level++) {
		len += maxrecs - 1;
		do_div(len, maxrecs);
		maxrecs = limits[1];
		rval += len;
	}
	return rval;
}
+2 −0
Original line number Original line Diff line number Diff line
@@ -501,6 +501,8 @@ bool xfs_btree_sblock_v5hdr_verify(struct xfs_buf *bp);
bool xfs_btree_sblock_verify(struct xfs_buf *bp, unsigned int max_recs);
bool xfs_btree_sblock_verify(struct xfs_buf *bp, unsigned int max_recs);
uint xfs_btree_compute_maxlevels(struct xfs_mount *mp, uint *limits,
uint xfs_btree_compute_maxlevels(struct xfs_mount *mp, uint *limits,
				 unsigned long len);
				 unsigned long len);
xfs_extlen_t xfs_btree_calc_size(struct xfs_mount *mp, uint *limits,
		unsigned long long len);


/* return codes */
/* return codes */
#define XFS_BTREE_QUERY_RANGE_CONTINUE	0	/* keep iterating */
#define XFS_BTREE_QUERY_RANGE_CONTINUE	0	/* keep iterating */