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xen-devel
[Xen-devel] Re: [PATCH UPDATED] xen: add xenfs to allow usermode <-> Xen
* Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
> On Wed, 17 Dec 2008 13:24:39 -0800
> Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:
>
> > The xenfs filesystem exports various interfaces to usermode. Initially
> > this exports a file to allow usermode to interact with xenbus/xenstore.
> >
> > Traditionally this appeared in /proc/xen. Rather than extending procfs,
> > this patch adds a backward-compat mountpoint on /proc/xen, and provides
> > a xenfs filesystem which can be mounted there.
> >
> > [
> > I did quite a lot of work to this code as a result of review, which is
> > why this is a repost rather than a delta. The changes are:
> >
> > - Moved the XENFS_SUPER_MAGIC to linux/magic.h
> > - Added comments to answer the "what's this for?" questions (I hope)
> > - Split things out into smaller functions
> > - Cleaned up type of queue_reply(), removed casts
> > - Added a mutex to protect struct xenbus_file_priv. This protects
> > the list heads, and the partial message buffer. There were
> > several ways in which usermode could overwrite the kernel's
> > memory via races without this locking.
> > - Fixed a bug in which usermode could start sending a message
> > which can never be sent, leaving the file descriptor in a
> > useless state.
>
> I'm bored of your filesystem, so I think I'll just merge it, unless
> someone else wants to ;)
please do - there should be no big overlap with existing other Xen bits in
tip/*.
Ingo
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