Am 23.09.2016 um 16:40 hat Eric Blake geschrieben: > On 09/23/2016 09:32 AM, Kevin Wolf wrote: > > The option whether or not to use a native AIO interface really isn't a > > generic option for all drivers, but only applies to the native file > > protocols. This patch moves the option in blockdev-add to the > > appropriate places (raw-posix and raw-win32). > > > > We still have to keep the flag BDRV_O_NATIVE_AIO for compatibility > > because so far the AIO option was usually specified on the wrong layer > > (the top-level format driver, which didn't even look at it) and then > > inherited by the protocol driver (where it was actually used). We can't > > forbid this use except in new interfaces. > > > > Signed-off-by: Kevin Wolf <kw...@redhat.com> > > --- > > block/raw-posix.c | 44 ++++++++++++++++++++++++--------------- > > block/raw-win32.c | 56 > > +++++++++++++++++++++++++++++++++++++++++++++----- > > qapi/block-core.json | 6 +++--- > > tests/qemu-iotests/087 | 4 ++-- > > 4 files changed, 83 insertions(+), 27 deletions(-) > > > > > +++ b/qapi/block-core.json > > @@ -1724,11 +1724,13 @@ > > # Driver specific block device options for the file backend. > > # > > # @filename: path to the image file > > +# @aio: #optional AIO backend (default: threads) > > Missed this last time, but probably worth a '(since 2.8)' marker.
I'm not sure how useful this is when the whole blockdev-add command is still experimental and we're going to break it incompatibly by removing the "options" layer. But we have the annotation elsewhere, so I'll add it. Maybe the patch that breaks compatibility should remove the annotation everywhere again. Kevin
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