From: Pekka Enberg This documents revoke file operation in Documentation/filesystems/vfs.txt. Acked-by: Alan Cox Signed-off-by: Pekka Enberg Cc: Christoph Hellwig Cc: Michael Kerrisk Cc: Andi Kleen Signed-off-by: Andrew Morton --- Documentation/filesystems/vfs.txt | 5 +++++ 1 file changed, 5 insertions(+) diff -puN Documentation/filesystems/vfs.txt~revoke-add-documentation Documentation/filesystems/vfs.txt --- a/Documentation/filesystems/vfs.txt~revoke-add-documentation +++ a/Documentation/filesystems/vfs.txt @@ -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 _