Messages in this thread |  | | Date | Tue, 3 Sep 2002 17:53:39 +0200 (MET DST) | From | "Maciej W. Rozycki" <> | Subject | Re: [RFC] mount flag "direct" |
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On Tue, 3 Sep 2002, Rik van Riel wrote:
> > Rationale: > > No caching means that each kernel doesn't go off with its own idea of > > what is on the disk in a file, at least. Dunno about directories and > > metadata. > > 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.
-- + Maciej W. Rozycki, Technical University of Gdansk, Poland + +--------------------------------------------------------------+ + e-mail: macro@ds2.pg.gda.pl, PGP key available +
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