Message ID | 151398982771.18741.440105008563284269.stgit@magnolia (mailing list archive) |
---|---|
State | Accepted |
Headers | show |
On Fri, Dec 22, 2017 at 04:43:47PM -0800, Darrick J. Wong wrote: > From: Darrick J. Wong <darrick.wong@oracle.com> > > 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> > --- > fs/xfs/libxfs/xfs_refcount.c | 19 +++++++++++++++++++ > fs/xfs/libxfs/xfs_refcount.h | 3 +++ > 2 files changed, 22 insertions(+) looks fine. Reviewed-by: Dave Chinner <dchinner@redhat.com>
diff --git a/fs/xfs/libxfs/xfs_refcount.c b/fs/xfs/libxfs/xfs_refcount.c index c40d267..bee68c2 100644 --- a/fs/xfs/libxfs/xfs_refcount.c +++ b/fs/xfs/libxfs/xfs_refcount.c @@ -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); +} diff --git a/fs/xfs/libxfs/xfs_refcount.h b/fs/xfs/libxfs/xfs_refcount.h index eafb9d1..2a731ac 100644 --- a/fs/xfs/libxfs/xfs_refcount.h +++ b/fs/xfs/libxfs/xfs_refcount.h @@ -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__ */