9p: Make sure we are able to clunk the cached fid on umount

dcache prune happen on umount. So we cannot mark the client
satus disconnect. That will prevent a 9p call to the server

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

3 files changed, 16 insertions, 1 deletions

diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index 2f814cf0c731..0b78ae8157b9 100644
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -342,6 +342,19 @@ void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
         p9_client_disconnect(v9ses->clnt);
 }
 
+/**
+ * v9fs_session_begin_cancel - Begin terminate of a session
+ * @v9ses: session to terminate
+ *
+ * After this call we don't allow any request other than clunk.
+ */
+
+void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses)
+{
+        P9_DPRINTK(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses);
+        p9_client_begin_disconnect(v9ses->clnt);
+}
+
 extern int v9fs_error_init(void);
 
 static struct kobject *v9fs_kobj;
diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h
index 6b801d1ddf4b..a0a8d3dd1361 100644
--- a/fs/9p/v9fs.h
+++ b/fs/9p/v9fs.h
@@ -108,6 +108,7 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *, const char *,
                                                                         char *);
 void v9fs_session_close(struct v9fs_session_info *v9ses);
 void v9fs_session_cancel(struct v9fs_session_info *v9ses);
+void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses);
 
 #define V9FS_MAGIC 0x01021997
 
diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
index 69357c0d9899..d1a3c809a291 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -193,6 +193,7 @@ static void v9fs_kill_super(struct super_block *s)
 
         kill_anon_super(s);
 
+        v9fs_session_cancel(v9ses);
         v9fs_session_close(v9ses);
         kfree(v9ses);
         s->s_fs_info = NULL;
@@ -205,7 +206,7 @@ v9fs_umount_begin(struct super_block *sb)
         struct v9fs_session_info *v9ses;
 
         v9ses = sb->s_fs_info;
-        v9fs_session_cancel(v9ses);
+        v9fs_session_begin_cancel(v9ses);
 }
 
 static const struct super_operations v9fs_super_ops = {