nfsd: Ensure stateids remain unique until they are freed
Add an extra delegation state to allow the stateid to remain in the idr
tree until the last reference has been released. This will be necessary
to ensure uniqueness once the client_mutex is removed.
[jlayton: reset the sc_type under the state_lock in unhash_delegation]
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 81b7522..996d61e 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -80,6 +80,7 @@
#define NFS4_CLOSED_STID 8
/* For a deleg stateid kept around only to process free_stateid's: */
#define NFS4_REVOKED_DELEG_STID 16
+#define NFS4_CLOSED_DELEG_STID 32
unsigned char sc_type;
stateid_t sc_stateid;
struct nfs4_client *sc_client;