Re: [RFC] mount flag "direct"

[Peter T. Breuer]

"A month of sundays ago Maciej W. Rozycki wrote:"
> On Tue, 3 Sep 2002, Rik van Riel wrote:
> > And what if they both allocate the same disk block to another
> > file, simultaneously ?
> 
>  You need a mutex then.  For SCSI devices a reservation is the way to go
> -- the RESERVE/RELEASE commands are mandatory for direct-access devices,
> so thy should work universally for disks.

Is there provision in VFS for this operation?

(i.e. care to point me at an entry point? I just grepped for "reserve"
and came up with nothing useful).

Peter