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>

diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 0ef9b6b410a2b89071e6d50b7b34c3f5457da434..b31e46eeb02679ad6d915221d41c37e00bd073fe 100644 (file)
--- 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 {