nfsd41: destroy_session operation

Implement the destory_session operation confoming to
http://tools.ietf.org/html/draft-ietf-nfsv4-minorversion1-26

[use sessionid_lock spin lock]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

1 files changed, 28 insertions, 1 deletions

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 04a395fb5dce..9192e5b35f42 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1422,7 +1422,34 @@ nfsd4_destroy_session(struct svc_rqst *r,
                       struct nfsd4_compound_state *cstate,
                       struct nfsd4_destroy_session *sessionid)
 {
-        return -1;      /* stub */
+        struct nfsd4_session *ses;
+        u32 status = nfserr_badsession;
+
+        /* Notes:
+         * - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid
+         * - Should we return nfserr_back_chan_busy if waiting for
+         *   callbacks on to-be-destroyed session?
+         * - Do we need to clear any callback info from previous session?
+         */
+
+        dump_sessionid(__func__, &sessionid->sessionid);
+        spin_lock(&sessionid_lock);
+        ses = find_in_sessionid_hashtbl(&sessionid->sessionid);
+        if (!ses) {
+                spin_unlock(&sessionid_lock);
+                goto out;
+        }
+
+        unhash_session(ses);
+        spin_unlock(&sessionid_lock);
+
+        /* wait for callbacks */
+        shutdown_callback_client(ses->se_client);
+        nfsd4_put_session(ses);
+        status = nfs_ok;
+out:
+        dprintk("%s returns %d\n", __func__, ntohl(status));
+        return status;
 }
 
 __be32