lkml.org 
[lkml]   [2002]   [Sep]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
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 +

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:28    [W:0.094 / U:0.032 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site