Re: [Qemu-devel] [PATCH 1/5] RFC: Efficient VM backup for qemu (v1)

[Kevin Wolf]

Am 23.11.2012 08:38, schrieb Dietmar Maurer:
>> In short, the idea is that you can stick filters on top of a 
>> BlockDriverState, so
>> that any read/writes (and possibly more requests, if necessary) are routed
>> through the filter before they are passed to the block driver of this BDS.
>> Filters would be implemented as BlockDrivers, i.e. you could implement
>> .bdrv_co_write() in a filter to intercept all writes to an image.
> 
> I am quite unsure if that make things easier.

At least it would make for a much cleaner design compared to putting
code for every feature you can think of into bdrv_co_do_readv/writev().

Kevin