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Re: [Qemu-devel] [PATCH 1/2] qemu-nbd: Shrink image size by specified of
From: |
Tomáš Golembiovský |
Subject: |
Re: [Qemu-devel] [PATCH 1/2] qemu-nbd: Shrink image size by specified offset |
Date: |
Mon, 3 Oct 2016 15:50:45 +0200 |
Whops, somehow I completely forgot about this.
On Tue, 20 Sep 2016 09:09:59 -0500
Eric Blake <address@hidden> wrote:
> On 09/20/2016 04:37 AM, Tomáš Golembiovský wrote:
>
> [meta-comment]: Your series came through without any threading (you sent
> three threads, instead of patch 1 and 2 being marked In-Reply-To the 0/2
> cover letter).
Thanks for the comment. Unfortunately it was my email client
interfering. It should be better next time.
> > When --offset is set the apparent device size has to be adjusted
> > accordingly. Otherwise client may request read/write beyond the file end
> > which would fail.
> >
> > Signed-off-by: Tomáš Golembiovský <address@hidden>
> > ---
> > qemu-nbd.c | 7 +++++++
> > 1 file changed, 7 insertions(+)
> >
> > diff --git a/qemu-nbd.c b/qemu-nbd.c
> > index 99297a5..629bce1 100644
> > --- a/qemu-nbd.c
> > +++ b/qemu-nbd.c
> > @@ -901,6 +901,13 @@ int main(int argc, char **argv)
> > exit(EXIT_FAILURE);
> > }
>
> Additional context:
>
> off_t dev_offset = 0;
>
> off_t fd_size;
>
> >
> > + if (dev_offset >= fd_size) {
> > + error_report("Offset (%lu) has to be smaller than the image size
> > (%lu)",
> > + dev_offset, fd_size);
>
> Whoops, this fails to compile on 32-bit platforms. %lu is not
> necessarily synonymous with off_t values.
After some digging I figured off_t is in fact signed type. That makes
the formatting wrong everywhere. Unfortunately I didn't find any good
definition of the type. Any suggestion what format flag should I use? Or
should I just use a temporary variable of known size for that?
Thanks,
Tomas
--
Tomáš Golembiovský <address@hidden>
- Re: [Qemu-devel] [PATCH 1/2] qemu-nbd: Shrink image size by specified offset,
Tomáš Golembiovský <=