Messages in this thread | | | Subject | Re: [PATCH] direct-IO API change | From | Terje Eggestad <> | Date | 08 Oct 2002 15:33:56 +0200 |
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On lør, 2002-10-05 at 01:23, Linus Torvalds wrote: > On Fri, 4 Oct 2002, Andrew Morton wrote: > > > > Because the file handle which we have is for /dev/raw/raw0, > > not for /dev/hda1. > > > > The raw driver binds to major/minor, not a file*. I considered > > changing that (change userspace to pass the open fd). But didn't. > > Ok. I'd really rather have a cleaner internal API and break the raw driver > for a while, than have a silly API just because the raw driver uses it. > > Especially since I thought that O_DIRECT on the regular file (or block > device) performed about as well as raw does anyway these days? Or is that > just one of my LSD-induced flashbacks? >
Well, somewhat LSD induced. /dev/raw/rawN has a merit for shared disk. Databases (Read Oracle) most notably need raw devices for parallell databases. It would GREATLY benefit from a cluster aware fs with O_DIRECT support, Sistina added that to their closed source GFS 5.x.
Working with blockdevices are pure evil in my view anyway, but until a OSS FS that is cluster aware are a part of a vanilla kernel, I'm afraid that /dev/raw/rawN are a necessary evil
> Linus >
TJ
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Terje Eggestad mailto:terje.eggestad@scali.no Scali Scalable Linux Systems http://www.scali.com
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