Re: [Qemu-devel] [RFC 4/5] block: Add AIO followers

[Max Reitz <mreitz@redhat.com>]

On 04.06.2014 14:41, Stefan Hajnoczi wrote:
> On Sat, May 31, 2014 at 08:43:11PM +0200, Max Reitz wrote:
>> If a long-running operation on a BDS wants to always remain in the same
>> AIO context, it somehow needs to keep track of the BDS changing its
>> context. This adds a function for registering callbacks on a BDS which
>> are called whenever the BDS is attached or detached from an AIO context.
>>
>> Signed-off-by: Max Reitz <mreitz@redhat.com>
>> ---
>>   block.c                   | 55 +++++++++++++++++++++++++++++++++++++++++++++++
>>   include/block/block_int.h | 40 ++++++++++++++++++++++++++++++++++
>>   2 files changed, 95 insertions(+)
> Great, we definitely need this mechanism.  Block jobs can also use it
> later.
>
> Usually QEMU calls this a "notifier" rather than a "follower".  For
> example, see include/qemu/notifier.h and bdrv_add_close_notifier().

Ah, I  see, thank you.

Max

> Stefan