[PATCH 4.19 44/84] NFSv4.x: Drop the slot if nfs4_delegreturn_prepare waits for layoutreturn

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From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>

commit 5326de9e94bedcf7366e7e7625d4deb8c1f1ca8a upstream.

If nfs4_delegreturn_prepare needs to wait for a layoutreturn to complete
then make sure we drop the sequence slot if we hold it.

Fixes: 1c5bd76d17cc ("pNFS: Enable layoutreturn operation for return-on-close")
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 fs/nfs/nfs4proc.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -6103,8 +6103,10 @@ static void nfs4_delegreturn_prepare(str
 
 	d_data = (struct nfs4_delegreturndata *)data;
 
-	if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task))
+	if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) {
+		nfs4_sequence_done(task, &d_data->res.seq_res);
 		return;
+	}
 
 	lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
 	if (lo && !pnfs_layout_is_valid(lo)) {





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