Re: [Qemu-devel] [PATCH for 2.9 v3 00/10] block: Fixes regarding dataplane and management operations

[Kevin Wolf <kwolf@redhat.com>]

Am 10.04.2017 um 17:05 hat Fam Zheng geschrieben:
> v3: Respin the unmerged changes from v2 and include one new fix:
> 
>     (Yes, it is a big series for the last -rc, and I personally prefer the v2
>     approach for the 4-9 part of the problem, which is much more mechanical.)
> 
>     - 1, 2 are redoing previous patch 4, using bdrv_parent_drained_begin/end.
>       [Kevin]
>       Also fix the ordering against aio_context_release. [Stefan]
>     - 3 is unchanged from patch 6 in v2.
>     - 4-9 are reworking of patch 5 following Paolo's suggestion, which allowed
>       better patch split.
>     - 10 is finding of a latent bug, which is revealed by patch 9.
> 
> v2: - Drop patch 4 in v1. A second thought made me feel neither it nor Kevin's
>       suggestion to move the BH process to bdrv_drain_recurse/BDRV_POLL_WHILE
>       is a complete fix. So leave it for a separate patch.
>     - Add rev-by to patches 1, 3, 4.
>     - Split from patch 1 in v1 and add patch 2, for the new assertions. [Kevin]
>     - Rewrite patch 5. Fix block job's co when a BDS is moved to a different
>       aio context. [Kevin]
>     - Add patch 6.
> 
> Crashes are reported on dataplane devices when doing snapshot and commit under
> guest I/O.
> 
> With this series, Ed's test case '176' now passes:
> 
>     https://github.com/skyportsystems/qemu-1/commits/eswierk-iotests-2.9

I had only two points for this series. The first is that it adds unused
functions, which doesn't hurt (but I might just send a PATCH 11/10 to
remove them again). The second one is that some sheepdog code is
suspicious, but if anything it just means that this series is incomplete,
so not a show stopper either.

Reviewed-by: Kevin Wolf <kwolf@redhat.com>