Re: [Qemu-devel] [PATCH v4 09/11] DumpState: adding total_size and written_size fields

[Peter Xu <peterx@redhat.com>]

On Wed, Dec 02, 2015 at 05:49:18PM +0800, Fam Zheng wrote:
> On Wed, 12/02 16:49, Peter Xu wrote:
> > On Wed, Dec 02, 2015 at 09:32:57AM +0800, Fam Zheng wrote:
> > > > @@ -1301,6 +1303,7 @@ static void write_dump_pages(DumpState *s, Error **errp)
> > > >                  goto out;
> > > >              }
> > > >          }
> > > > +        s->written_size += TARGET_PAGE_SIZE;
> > > 
> > > The same question applies here.
> > 
> > For kdump case, it is using "goto out" when error happens. So it
> > seems to have no problem here?
> 
> write_cache can fail after you increment it here, no?

I am adding it at the end of loop. It looks like:

    while (get_next_page(&block_iter, &pfn_iter, &buf, s)) {
        if (is_zero_page(buf, TARGET_PAGE_SIZE)) {
            ret = write_cache(&page_desc, &pd_zero, sizeof(PageDescriptor),
                              false);
            if (ret < 0) {
                error_setg(errp, "XXXXXXXX");
                goto out;
            }
        } else {
		    ...
            ret = write_cache(&page_desc, &pd, sizeof(PageDescriptor), false);
            if (ret < 0) {
                error_setg(errp, "XXXXXXXX");
                goto out;
            }
			...
        }
        s->written_size += TARGET_PAGE_SIZE;
    }

Label "out" is out of the loop. So, when error happens, it sets the
errp and directly jump out of the loop. Did I miss anything?

Thanks!
Peter

> 
> Fam