xfs: queue inactivation immediately when quota is nearing enforcement

Now that we have made the inactivation of unlinked inodes a background
task to increase the throughput of file deletions, we need to be a
little more careful about how long of a delay we can tolerate.

Specifically, if the dquots attached to the inode being inactivated are
nearing any kind of enforcement boundary, we want to queue that
inactivation work immediately so that users don't get EDQUOT/ENOSPC
errors even after they deleted a bunch of files to stay within quota.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c
index 351d99bc52e5..2bef4735d030 100644
--- a/fs/xfs/xfs_qm.c
+++ b/fs/xfs/xfs_qm.c
@@ -1882,3 +1882,37 @@ xfs_qm_vop_create_dqattach(
 	}
 }
 
+/* Decide if this inode's dquot is near an enforcement boundary. */
+bool
+xfs_inode_near_dquot_enforcement(
+	struct xfs_inode	*ip,
+	xfs_dqtype_t		type)
+{
+	struct xfs_dquot	*dqp;
+	int64_t			freesp;
+
+	/* We only care for quotas that are enabled and enforced. */
+	dqp = xfs_inode_dquot(ip, type);
+	if (!dqp || !xfs_dquot_is_enforced(dqp))
+		return false;
+
+	if (xfs_dquot_res_over_limits(&dqp->q_ino) ||
+	    xfs_dquot_res_over_limits(&dqp->q_rtb))
+		return true;
+
+	/* For space on the data device, check the various thresholds. */
+	if (!dqp->q_prealloc_hi_wmark)
+		return false;
+
+	if (dqp->q_blk.reserved < dqp->q_prealloc_lo_wmark)
+		return false;
+
+	if (dqp->q_blk.reserved >= dqp->q_prealloc_hi_wmark)
+		return true;
+
+	freesp = dqp->q_prealloc_hi_wmark - dqp->q_blk.reserved;
+	if (freesp < dqp->q_low_space[XFS_QLOWSP_5_PCNT])
+		return true;
+
+	return false;
+}