[RFC/PATCH 5/5] revoke: add documentation

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

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

This documents revoke file operation in Documentation/filesystems/vfs.txt.

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	2007-05-21 15:37:59.000000000 +0300
+++ 2.6/Documentation/filesystems/vfs.txt	2007-07-11 11:48:46.000000000 +0300
@@ -732,6 +732,7 @@ struct file_operations {
 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
@@ -805,6 +806,10 @@ 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) and frevoke(2) system calls to revoke access
+	  to an open file. This method must ensure that all currently blocked
+	  writes are flushed and 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