[PATCH] fuse: add request interruption

Add synchronous request interruption.  This is needed for file locking
operations which have to be interruptible.  However filesystem may implement
interruptibility of other operations (e.g.  like NFS 'intr' mount option).

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/fuse.h

@@ -125,7 +125,8 @@ enum fuse_opcode {
 	FUSE_SETLK         = 32,
 	FUSE_SETLKW        = 33,
 	FUSE_ACCESS        = 34,
-	FUSE_CREATE        = 35
+	FUSE_CREATE        = 35,
+	FUSE_INTERRUPT     = 36,
 };
 
 /* The read buffer is required to be at least 8k, but may be much larger */
@@ -291,6 +292,10 @@ struct fuse_init_out {
 	__u32	max_write;
 };
 
+struct fuse_interrupt_in {
+	__u64	unique;
+};
+
 struct fuse_in_header {
 	__u32	len;
 	__u32	opcode;