Oh，I got it, thanks.
Sochin On 2017/6/29 6:33, Max Reitz wrote: > On 2017-06-26 13:04, sochin.jiang wrote: >> From: "sochin.jiang" <sochin.ji...@huawei.com> >> >> mirror_complete opens the backings, BDSs of the new open backings should >> have a >> same AioContext with the top when using iothreads, fix the code to >> guarantee this, >> also avoiding unexpected qemu exit(assert fails in bdrv_attach_child). > Thanks! The functional change looks good to me. I'll see to add an > iotest to cover this case. > > Some notes: There shouldn't be any spaces at the front of these lines, > and every line should be limited to 72 characters. > > Also, the commit message should not end in a full stop (and it's good to > keep it short). > > I've reworded a bit of the commit message (and shortened the title*) and > applied it to my block branch: > > https://github.com/XanClic/qemu/commits/block > > Max > > [1] I've shortened it to "mirror: Fix inconsistent backing AioContext > for after mirroring". I usually try to fit the title into 50 characters > (because that's what the default vim highlighting is proposing...), so > for reference, I would have made it something like "block: Align backing > BDS's AioContext with overlay" -- if it had been my patch. Since it was > yours, I'm fine with commit titles longer than 50 characters (although > they really should not exceed 72). > >> Signed-off-by: sochin.jiang <sochin.ji...@huawei.com> >> --- >> block.c | 1 + >> 1 file changed, 1 insertion(+) >> >> diff --git a/block.c b/block.c >> index 6943962..b312fe6 100644 >> --- a/block.c >> +++ b/block.c >> @@ -2185,6 +2185,7 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict >> *parent_options, >> ret = -EINVAL; >> goto free_exit; >> } >> + bdrv_set_aio_context(backing_hd, bdrv_get_aio_context(bs)); >> >> /* Hook up the backing file link; drop our reference, bs owns the >> * backing_hd reference now */ >> >
