Commit d12bf8ba authored by Darrick J. Wong's avatar Darrick J. Wong
Browse files

xfs: create a ranged query function for refcount btrees 



Implement ranged queries for refcount records.  The next patch will use
this to scan refcount data.

Signed-off-by: default avatarDarrick J. Wong <djwong@kernel.org>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
parent 48a72f60

fs/xfs/libxfs/xfs_refcount.c

+41 −0
Original line number Diff line number Diff line
@@ -2031,6 +2031,47 @@ xfs_refcount_has_records( 
	return xfs_btree_has_records(cur, &low, &high, NULL, outcome);

}



struct xfs_refcount_query_range_info {

	xfs_refcount_query_range_fn	fn;

	void				*priv;

};



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

STATIC int

xfs_refcount_query_range_helper(

	struct xfs_btree_cur		*cur,

	const union xfs_btree_rec	*rec,

	void				*priv)

{

	struct xfs_refcount_query_range_info	*query = priv;

	struct xfs_refcount_irec	irec;

	xfs_failaddr_t			fa;



	xfs_refcount_btrec_to_irec(rec, &irec);

	fa = xfs_refcount_check_irec(cur->bc_ag.pag, &irec);

	if (fa)

		return xfs_refcount_complain_bad_rec(cur, fa, &irec);



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

}



/* Find all refcount records between two keys. */

int

xfs_refcount_query_range(

	struct xfs_btree_cur		*cur,

	const struct xfs_refcount_irec	*low_rec,

	const struct xfs_refcount_irec	*high_rec,

	xfs_refcount_query_range_fn	fn,

	void				*priv)

{

	union xfs_btree_irec		low_brec = { .rc = *low_rec };

	union xfs_btree_irec		high_brec = { .rc = *high_rec };

	struct xfs_refcount_query_range_info query = { .priv = priv, .fn = fn };



	return xfs_btree_query_range(cur, &low_brec, &high_brec,

			xfs_refcount_query_range_helper, &query);

}



int __init

xfs_refcount_intent_init_cache(void)

{

fs/xfs/libxfs/xfs_refcount.h

+10 −0
Original line number Diff line number Diff line
@@ -127,4 +127,14 @@ extern struct kmem_cache *xfs_refcount_intent_cache; 
int __init xfs_refcount_intent_init_cache(void);

void xfs_refcount_intent_destroy_cache(void);



typedef int (*xfs_refcount_query_range_fn)(

	struct xfs_btree_cur		*cur,

	const struct xfs_refcount_irec	*rec,

	void				*priv);



int xfs_refcount_query_range(struct xfs_btree_cur *cur,

		const struct xfs_refcount_irec *low_rec,

		const struct xfs_refcount_irec *high_rec,

		xfs_refcount_query_range_fn fn, void *priv);



#endif	/* __XFS_REFCOUNT_H__ */