Re: [RFC] mount flag "direct"

Rik van Riel
2002-09-03T16:04:45Z

On Tue, 3 Sep 2002, Peter T. Breuer wrote:
> "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?

No. Everybody but you seems to agree these things should be
filesystem specific and not in the VFS.

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

Good.

cheers,

Rik
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