Date: Tue, 25 Jan 2000 15:16:58 +0100 From: Gary Howland <gary@hotlava.com> To: fs@freebsd.org Subject: Re: UDF, userfs Message-ID: <388DB05A.153913B7@hotlava.com> References: <E12ChzA-0001T9-00@leo.software.plasmon>
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Steve McIntyre wrote: > > you write: > > > >There are some file systems in the commerical world that "uplink" to > >a user mode daemon that does the actual on-disk work. Without naming > >names, I can think of at least two that actually do this... > > > >They present a pseudo-device which the end-user mounts. This > >pseudo-device catches all the file system requests and "up calls" the > >user mode daemon. The user mode daemon than talks to the real device to > >perform the i/o. I may be able to provide details of the process from > >another Unix system, but not actual code. > > > >This approach seems to handle many o/s'es in that the daemon can be made > >somewhat portable. The pseudo-device, however, is of necessity o/s > >specific. > > You're spot on with the description above - we have jukebox management > software that does exactly this. Our method is portable to AIX, Solaris, > FreeBSD and NT right now, Linux and HP-UX support is coming soon. FYI, CFS (encrypted file system) achieves similar things using a custom NFS daemon, rather than a pseudo device. Gary To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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