Commit 49db55ec authored by Darrick J. Wong's avatar Darrick J. Wong
Browse files

xfs: add scrub cross-referencing helpers for the refcount btrees 



Add a couple of functions to the refcount btrees that will be used
to cross-reference metadata against the refcountbt.

Signed-off-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: default avatarDave Chinner <dchinner@redhat.com>
parent ed7c52d4

fs/xfs/libxfs/xfs_refcount.c

+19 −0
Original line number Diff line number Diff line
@@ -1696,3 +1696,22 @@ xfs_refcount_recover_cow_leftovers( 
	xfs_trans_brelse(tp, agbp);

	goto out_trans;

}



/* Is there a record covering a given extent? */

int

xfs_refcount_has_record(

	struct xfs_btree_cur	*cur,

	xfs_agblock_t		bno,

	xfs_extlen_t		len,

	bool			*exists)

{

	union xfs_btree_irec	low;

	union xfs_btree_irec	high;



	memset(&low, 0, sizeof(low));

	low.rc.rc_startblock = bno;

	memset(&high, 0xFF, sizeof(high));

	high.rc.rc_startblock = bno + len - 1;



	return xfs_btree_has_record(cur, &low, &high, exists);

}

fs/xfs/libxfs/xfs_refcount.h

+3 −0
Original line number Diff line number Diff line
@@ -83,4 +83,7 @@ static inline xfs_fileoff_t xfs_refcount_max_unmap(int log_res) 
	return (log_res * 3 / 4) / XFS_REFCOUNT_ITEM_OVERHEAD;

}



extern int xfs_refcount_has_record(struct xfs_btree_cur *cur,

		xfs_agblock_t bno, xfs_extlen_t len, bool *exists);



#endif	/* __XFS_REFCOUNT_H__ */