Re: [PATCH v3 0/4] fix two edge cases related to stream block jobs

[Kevin Wolf <kwolf@redhat.com>]

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Am 25.03.2024 um 21:11 hat Stefan Hajnoczi geschrieben:
> On Fri, Mar 22, 2024 at 10:50:05AM +0100, Fiona Ebner wrote:
> > Changes in v3:
> >     * Also deal with edge case in bdrv_next_cleanup(). Haven't run
> >       into an actual issue there, but at least the caller in
> >       migration/block.c uses bdrv_nb_sectors() which, while not a
> >       coroutine wrapper itself (it's written manually), may call
> >       bdrv_refresh_total_sectors(), which is a generated coroutine
> >       wrapper, so AFAIU, the block graph can change during that call.
> >       And even without that, it's just better to be more consistent
> >       with bdrv_next().
> > 
> > Changes in v2:
> >     * Ran into another issue while writing the IO test Stefan wanted
> >       to have (good call :)), so include a fix for that and add the
> >       test. I didn't notice during manual testing, because I hadn't
> >       used a scripted QMP 'quit', so there was no race.
> > 
> > Fiona Ebner (3):
> >   block-backend: fix edge case in bdrv_next() where BDS associated to BB
> >     changes
> >   block-backend: fix edge case in bdrv_next_cleanup() where BDS
> >     associated to BB changes
> >   iotests: add test for stream job with an unaligned prefetch read
> > 
> > Stefan Reiter (1):
> >   block/io: accept NULL qiov in bdrv_pad_request
> > 
> >  block/block-backend.c                         | 18 ++--
> >  block/io.c                                    | 31 ++++---
> >  .../tests/stream-unaligned-prefetch           | 86 +++++++++++++++++++
> >  .../tests/stream-unaligned-prefetch.out       |  5 ++
> >  4 files changed, 117 insertions(+), 23 deletions(-)
> >  create mode 100755 tests/qemu-iotests/tests/stream-unaligned-prefetch
> >  create mode 100644 tests/qemu-iotests/tests/stream-unaligned-prefetch.out
> 
> Looks good to me. I will wait until Thursday before merging in case
> Hanna, Vladimir, or Kevin have comments. Thanks!

Let's not delay it to -rc2. If something turns out to be wrong with it,
we can still revert it, but I think getting fixes in earlier is better
during freeze.

Thanks, applied to the block branch.

Kevin

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