[dm-devel] [PATCH RFC] dm snapshot: shared exception store
FUJITA Tomonori
fujita.tomonori at lab.ntt.co.jp
Tue Aug 12 13:14:24 UTC 2008
On Tue, 12 Aug 2008 05:56:57 -0700
Daniel Phillips <phillips at phunq.net> wrote:
> Hi tomonori,
>
> An impressive patch.
Thanks, and thanks a lot for the nice snapshot code.
> You just want to use getblk for alloc_chunk_buffer,
> not vmalloc.
I think that it means that we cache all the chunks, both btree chunks
and the data chunks (which are passed to the upper layer such as file
systems). I think that we don't want cache the latter in dm.
> That is what the buffer cache is for, and that is why I
> emulated it in userspace.
>
> More comments later.
Thanks.
I'll post a new patchset in a more reasonable format shortly (tomorrow
or day after tomorrow, hopefully).
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