nfsd4: don't destroy in-use session

This changes session destruction to be similar to client destruction in
that attempts to destroy a session while in use (which should be rare
corner cases) result in DELAY.  This simplifies things somewhat and
helps meet a coming 4.2 requirement.

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

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 07f8a822a6ce..f6ae4db3efdb 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -194,9 +194,11 @@ struct nfsd4_conn {
 };
 
 struct nfsd4_session {
-        struct kref             se_ref;
+        atomic_t                se_ref;
         struct list_head        se_hash;        /* hash by sessionid */
         struct list_head        se_perclnt;
+/* See SESSION4_PERSIST, etc. for standard flags; this is internal-only: */
+#define NFS4_SESSION_DEAD       0x010
         u32                     se_flags;
         struct nfs4_client      *se_client;
         struct nfs4_sessionid   se_sessionid;