[PATCH 4/5] revoke: add documentation

[Pekka J Enberg]

From: Pekka Enberg <penberg@xxxxxxxxxxxxxx>

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

Acked-by: Alan Cox <alan@xxxxxxxxxx>
Signed-off-by: Pekka Enberg <penberg@xxxxxxxxxxxxxx>
---
 Documentation/filesystems/vfs.txt |    5 +++++
 1 file changed, 5 insertions(+)

Index: uml-2.6/Documentation/filesystems/vfs.txt
===================================================================
--- uml-2.6.orig/Documentation/filesystems/vfs.txt	2007-03-11 13:05:33.000000000 +0200
+++ uml-2.6/Documentation/filesystems/vfs.txt	2007-03-11 13:09:22.000000000 +0200
@@ -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
-
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