nfsd: warn on odd reply state in nfsd_vfs_read

As far as I can tell this shouldn't currently happen--or if it does,
something is wrong and data is going to be corrupted.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 0ef9b6b410a2..b31e46eeb026 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -936,6 +936,7 @@ nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
                         .u.data         = rqstp,
                 };
 
+                WARN_ON_ONCE(rqstp->rq_resused != 1);
                 rqstp->rq_resused = 1;
                 host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor);
         } else {