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 <mre...@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(). Stefan
