From: Darrick J. Wong <djwong@kernel.org>

During quotaoff, the incore inode scan to detach dquots from inodes
won't touch inodes that have lost their VFS state but haven't yet been
queued for reclaim.  This isn't strictly a problem because we drop the
dquots at the end of inactivation, but if we detect this situation
before starting inactivation, we can drop the inactive dquots early to
avoid delaying quotaoff further.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
 fs/xfs/xfs_super.c |   32 ++++++++++++++++++++++++++++----
 1 file changed, 28 insertions(+), 4 deletions(-)

diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index a2dab05332ac..79f1cd1a0221 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c

@@ -637,22 +637,46 @@ xfs_fs_destroy_inode(
 	struct inode		*inode)
 {
 	struct xfs_inode	*ip = XFS_I(inode);
+	struct xfs_mount	*mp = ip->i_mount;
 
 	trace_xfs_destroy_inode(ip);
 
 	ASSERT(!rwsem_is_locked(&inode->i_rwsem));
-	XFS_STATS_INC(ip->i_mount, vn_rele);
-	XFS_STATS_INC(ip->i_mount, vn_remove);
+	XFS_STATS_INC(mp, vn_rele);
+	XFS_STATS_INC(mp, vn_remove);
+
+	/*
+	 * If a quota type is turned off but we still have a dquot attached to
+	 * the inode, detach it before processing this inode to avoid delaying
+	 * quotaoff for longer than is necessary.
+	 *
+	 * The inode has no VFS state and hasn't been tagged for any kind of
+	 * reclamation, which means that iget, quotaoff, blockgc, and reclaim
+	 * will not touch it.  It is therefore safe to do this locklessly
+	 * because we have the only reference here.
+	 */
+	if (!XFS_IS_UQUOTA_ON(mp)) {
+		xfs_qm_dqrele(ip->i_udquot);
+		ip->i_udquot = NULL;
+	}
+	if (!XFS_IS_GQUOTA_ON(mp)) {
+		xfs_qm_dqrele(ip->i_gdquot);
+		ip->i_gdquot = NULL;
+	}
+	if (!XFS_IS_PQUOTA_ON(mp)) {
+		xfs_qm_dqrele(ip->i_pdquot);
+		ip->i_pdquot = NULL;
+	}
 
 	xfs_inactive(ip);