Re: Direct I/O question: How to get dioinfo using ioctl?

[Andi Kleen <ak@xxxxxxx>]

On Mon, May 14, 2001 at 03:04:22PM -0700, Rosenthal, Eric S. wrote:
> 
> A couple of earlier threads mentioned this but didn't explain how to do it. 
> Direct I/O appears to work with the following code, but the ioctl command
> returns an error.  I'm looking for a command that does the same thing as
> fcntl(fileDescriptor, F_DIOINFO, &dioinfo) does on IRIX.  But I don't know
> if the 
> ioctl command is running xfs_ioctl like it should.

xfs_ioctl only runs when you use ioctl(2), not fcntl(2). Linux doesn't 
hand fcntl through the normal VFS, so XFS never sees it and has to use ioctl.


-Andi