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

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

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2018-01-16 18:52:14 -08:00
parent ed7c52d4bf
commit 49db55eca5
2 changed files with 22 additions and 0 deletions
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19
fs/xfs/libxfs/xfs_refcount.c
View File

@ -1696,3 +1696,22 @@ out_cursor:
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);
}

3
fs/xfs/libxfs/xfs_refcount.h
View File

@ -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__ */