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Re: [Qemu-trivial] [Qemu-devel] [PATCH] nbd: fix trim/discard commands w

From: Quentin Casasnovas
Subject: Re: [Qemu-trivial] [Qemu-devel] [PATCH] nbd: fix trim/discard commands with a length bigger than NBD_MAX_BUFFER_SIZE
Date: Wed, 11 May 2016 10:34:12 +0200
User-agent: Mutt/1.5.24 (2015-08-30)

On Tue, May 10, 2016 at 02:34:18PM -0600, Eric Blake wrote:
> On 05/06/2016 02:45 AM, Quentin Casasnovas wrote:
> > When running fstrim on a filesystem mounted through qemu-nbd with
> > --discard=on, fstrim would fail with I/O errors:
> > 
> >   $ fstrim /k/spl/ice/
> >   fstrim: /k/spl/ice/: FITRIM ioctl failed: Input/output error
> > 
> > and qemu-nbd was spitting these:
> > 
> >   nbd.c:nbd_co_receive_request():L1232: len (94621696) is larger than max 
> > len (33554432)
> Your patch duplicates what is already present in qemu:
> commit eb38c3b67018ff8069e4f674a28661931a8a3e4f
> Author: Paolo Bonzini <address@hidden>
> Date:   Thu Jan 7 14:32:42 2016 +0100
>     nbd-server: do not check request length except for reads and writes
>     Only reads and writes need to allocate memory correspondent to the
>     request length.  Other requests can be sent to the storage without
>     allocating any memory, and thus any request length is acceptable.
>     Reported-by: Sitsofe Wheeler <address@hidden>
>     Cc: address@hidden
>     Reviewed-by: Max Reitz <address@hidden>
>     Signed-off-by: Paolo Bonzini <address@hidden>
> For the purposes of qemu-stable, it's better to backport the existing
> patch than to write a new version of it.

Ha sorry I missed this! I wouldn't have tried to debug/fix myself otherwise :)

> It also helps to state what version of qemu you were testing, as it is
> obviously not the (soon-to-be-released) version 2.6 which already has
> the fix.

I was using qemu-2.5.0-rc3 on Gentoo but this was also verified on some
Debian systems which appears to be on 1.1.2+dfsg-6a+deb7u12 and on Ubuntu
Xenial 2.0.0+dfsg-2ubuntu1.22.

I wrote the patch on top of https://github.com/bonzini/qemu.git:master
(a7e00e2) which didn't contain the fix last Friday.

Anyway, cool if the fix is going into mainline :)


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