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Commit ed7c52d4 authored by Darrick J. Wong's avatar Darrick J. Wong
Browse files

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



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

Signed-off-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: default avatarDave Chinner <dchinner@redhat.com>
parent 2e001266

fs/xfs/libxfs/xfs_rmap.c

+67 −0
Original line number Diff line number Diff line
@@ -2387,3 +2387,70 @@ xfs_rmap_compare( 
	else

		return 0;

}



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

int

xfs_rmap_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.r.rm_startblock = bno;

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

	high.r.rm_startblock = bno + len - 1;



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

}



/*

 * Is there a record for this owner completely covering a given physical

 * extent?  If so, *has_rmap will be set to true.  If there is no record

 * or the record only covers part of the range, we set *has_rmap to false.

 * This function doesn't perform range lookups or offset checks, so it is

 * not suitable for checking data fork blocks.

 */

int

xfs_rmap_record_exists(

	struct xfs_btree_cur	*cur,

	xfs_agblock_t		bno,

	xfs_extlen_t		len,

	struct xfs_owner_info	*oinfo,

	bool			*has_rmap)

{

	uint64_t		owner;

	uint64_t		offset;

	unsigned int		flags;

	int			has_record;

	struct xfs_rmap_irec	irec;

	int			error;



	xfs_owner_info_unpack(oinfo, &owner, &offset, &flags);

	ASSERT(XFS_RMAP_NON_INODE_OWNER(owner) ||

	       (flags & XFS_RMAP_BMBT_BLOCK));



	error = xfs_rmap_lookup_le(cur, bno, len, owner, offset, flags,

			&has_record);

	if (error)

		return error;

	if (!has_record) {

		*has_rmap = false;

		return 0;

	}



	error = xfs_rmap_get_rec(cur, &irec, &has_record);

	if (error)

		return error;

	if (!has_record) {

		*has_rmap = false;

		return 0;

	}



	*has_rmap = (irec.rm_owner == owner && irec.rm_startblock <= bno &&

		     irec.rm_startblock + irec.rm_blockcount >= bno + len);

	return 0;

}

fs/xfs/libxfs/xfs_rmap.h

+5 −0
Original line number Diff line number Diff line
@@ -233,5 +233,10 @@ int xfs_rmap_compare(const struct xfs_rmap_irec *a, 
union xfs_btree_rec;

int xfs_rmap_btrec_to_irec(union xfs_btree_rec *rec,

		struct xfs_rmap_irec *irec);

int xfs_rmap_has_record(struct xfs_btree_cur *cur, xfs_agblock_t bno,

		xfs_extlen_t len, bool *exists);

int xfs_rmap_record_exists(struct xfs_btree_cur *cur, xfs_agblock_t bno,

		xfs_extlen_t len, struct xfs_owner_info *oinfo,

		bool *has_rmap);



#endif	/* __XFS_RMAP_H__ */