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Re: [Qemu-devel] file system sharing
From: |
Johannes Schindelin |
Subject: |
Re: [Qemu-devel] file system sharing |
Date: |
Sun, 31 Jul 2005 12:42:52 +0200 (CEST) |
Hi,
On Sun, 31 Jul 2005, Mark Williamson wrote:
> If only one machine (host or guest) has mounted the device then it should
> always be safe to do this. You may get away with read only mounting in one
> and writing in the other but it's not a reliable solution.
You almost certainly get not away with that if you are using Linux as
the read only part. Linux does quite a good job of caching filesystems,
but it thereby assumes to have exclusive control over the device (this
evidently only holds for non-networked FSes). Therefore, if you change
something behind the scenes, but Linux did not issue a write, it still
assumes the old data.
Ciao,
Dscho