Date: Wed, 21 Apr 2004 16:38:32 -0400 From: Garance A Drosihn <drosih@rpi.edu> To: Julian Elischer <julian@elischer.org>, hackers@freebsd.org Subject: Re: how to flush out cache.? Message-ID: <p0602041cbcac8b3862c2@[128.113.24.47]> In-Reply-To: <Pine.BSF.4.21.0404211219460.31770-100000@InterJet.elischer.org> References: <Pine.BSF.4.21.0404211219460.31770-100000@InterJet.elischer.org>
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At 12:23 PM -0700 4/21/04, Julian Elischer wrote: >Ok so I have an application where I need to >reread a file I have just written to ensure that it went to disk >correctly.. > >Other than reading a few GB of data, is there a way to flush >out the cache copy of a file I've written? > >possibilities include: > >a file flag saying "don't keep a copy after it's written to disk"? >a syscall discard_cached_blocks(fd); > > >? >any other suggestions? > >julian >(BTW this would be for 4.x initially) Hmm. That means you couldn't use a 'snapshot' to force the issue, right? If you *could* use snapshots, you could close the file, snapshot the partition, mount the snapshot, and read the file from it's copy in the snapshot-filesystem. -- Garance Alistair Drosehn = gad@gilead.netel.rpi.edu Senior Systems Programmer or gad@freebsd.org Rensselaer Polytechnic Institute or drosih@rpi.edu
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