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    SubjectRe: [RFC] mount flag "direct"
    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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