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Commit c543838a authored by Darrick J. Wong's avatar Darrick J. Wong Committed by Dave Chinner
Browse files

xfs: teach rmapbt to support interval queries 



Now that the generic btree code supports querying all records within a
range of keys, use that functionality to allow us to ask for all the
extents mapped to a range of physical blocks.

Signed-off-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: default avatarDave Chinner <dchinner@redhat.com>
Signed-off-by: default avatarDave Chinner <david@fromorbit.com>
parent cfed56ae

fs/xfs/libxfs/xfs_rmap.c

+43 −0
Original line number Diff line number Diff line
@@ -183,3 +183,46 @@ xfs_rmap_alloc( 
	trace_xfs_rmap_map_error(mp, agno, error, _RET_IP_);

	return error;

}



struct xfs_rmap_query_range_info {

	xfs_rmap_query_range_fn	fn;

	void				*priv;

};



/* Format btree record and pass to our callback. */

STATIC int

xfs_rmap_query_range_helper(

	struct xfs_btree_cur	*cur,

	union xfs_btree_rec	*rec,

	void			*priv)

{

	struct xfs_rmap_query_range_info	*query = priv;

	struct xfs_rmap_irec			irec;

	int					error;



	error = xfs_rmap_btrec_to_irec(rec, &irec);

	if (error)

		return error;

	return query->fn(cur, &irec, query->priv);

}



/* Find all rmaps between two keys. */

int

xfs_rmap_query_range(

	struct xfs_btree_cur		*cur,

	struct xfs_rmap_irec		*low_rec,

	struct xfs_rmap_irec		*high_rec,

	xfs_rmap_query_range_fn	fn,

	void				*priv)

{

	union xfs_btree_irec		low_brec;

	union xfs_btree_irec		high_brec;

	struct xfs_rmap_query_range_info	query;



	low_brec.r = *low_rec;

	high_brec.r = *high_rec;

	query.priv = priv;

	query.fn = fn;

	return xfs_btree_query_range(cur, &low_brec, &high_brec,

			xfs_rmap_query_range_helper, &query);

}

fs/xfs/libxfs/xfs_rmap.h

+9 −0
Original line number Diff line number Diff line
@@ -151,4 +151,13 @@ int xfs_rmap_lookup_eq(struct xfs_btree_cur *cur, xfs_agblock_t bno, 
int xfs_rmap_get_rec(struct xfs_btree_cur *cur, struct xfs_rmap_irec *irec,

		int *stat);



typedef int (*xfs_rmap_query_range_fn)(

	struct xfs_btree_cur	*cur,

	struct xfs_rmap_irec	*rec,

	void			*priv);



int xfs_rmap_query_range(struct xfs_btree_cur *cur,

		struct xfs_rmap_irec *low_rec, struct xfs_rmap_irec *high_rec,

		xfs_rmap_query_range_fn fn, void *priv);



#endif	/* __XFS_RMAP_H__ */