[PATCH] v9fs: new multiplexer implementation

New multiplexer implementation. Decreases the number of kernel threads
required. Better handling when the user process receives a signal.

Signed-off-by: Latchesar Ionkov <lucho@ionkov.net>
Cc: Eric Van Hensbergen <ericvh@ericvh.myip.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/9p/v9fs.h

@@ -57,24 +57,14 @@ struct v9fs_session_info {
 
 	/* book keeping */
 	struct v9fs_idpool fidpool;	/* The FID pool for file descriptors */
-	struct v9fs_idpool tidpool;	/* The TID pool for transactions ids */
 
-	/* transport information */
 	struct v9fs_transport *transport;
+	struct v9fs_mux_data *mux;
 
 	int inprogress;		/* session in progress => true */
 	int shutdown;		/* session shutting down. no more attaches. */
 	unsigned char session_hung;
-
-	/* mux private data */
-	struct v9fs_fcall *curfcall;
-	wait_queue_head_t read_wait;
-	struct completion fcread;
-	struct completion proccmpl;
-	struct task_struct *recvproc;
-
-	spinlock_t muxlock;
-	struct list_head mux_fcalls;
+	struct dentry *debugfs_dir;
 };
 
 /* possible values of ->proto */
@@ -84,11 +74,14 @@ enum {
 	PROTO_FD,
 };
 
+extern struct dentry *v9fs_debugfs_root;
+
 int v9fs_session_init(struct v9fs_session_info *, const char *, char *);
 struct v9fs_session_info *v9fs_inode2v9ses(struct inode *);
 void v9fs_session_close(struct v9fs_session_info *v9ses);
 int v9fs_get_idpool(struct v9fs_idpool *p);
 void v9fs_put_idpool(int id, struct v9fs_idpool *p);
+int v9fs_check_idpool(int id, struct v9fs_idpool *p);
 void v9fs_session_cancel(struct v9fs_session_info *v9ses);
 
 #define V9FS_MAGIC 0x01021997