Re: [Qemu-devel] file system sharing

[Johannes Schindelin]

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