[RFC/PATCH 8/8] revoke: add to documentation V7

[Pekka J Enberg <penberg@cs.helsinki.fi>]

From: Pekka Enberg <penberg@cs.helsinki.fi>

Add the ->revoke() file operation to VFS documentation.

Cc: Alan Cox <alan@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
---

 Documentation/filesystems/vfs.txt |    5 +++++
 1 file changed, 5 insertions(+)

Index: 2.6/Documentation/filesystems/vfs.txt
===================================================================
--- 2.6.orig/Documentation/filesystems/vfs.txt	2007-11-23 09:58:11.000000000 +0200
+++ 2.6/Documentation/filesystems/vfs.txt	2007-12-14 16:41:05.000000000 +0200
@@ -780,6 +780,7 @@ struct file_operations {
 	int (*flock) (struct file *, int, struct file_lock *);
 	ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, size_t, unsigned int);
 	ssize_t (*splice_read)(struct file *, struct pipe_inode_info *, size_t, unsigned int);
+	int (*revoke)(struct file *);
 };
 
 Again, all methods are called without any locks being held, unless
@@ -853,6 +854,10 @@ otherwise noted.
   splice_read: called by the VFS to splice data from file to a pipe. This
 	       method is used by the splice(2) system call
 
+  revoke: called by revokeat(2) system call to revoke access to an open file.
+	  This method must ensure that all currently blocked writes are flushed
+	  and that all pending reads will fail.
+
 Note that the file operations are implemented by the specific
 filesystem in which the inode resides. When opening a device node
 (character or block special) most filesystems will call special
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