[dm-devel] Re: [PATCH 12/17] bottom-layer barrier support
Mikulas Patocka
mpatocka at redhat.com
Mon Apr 27 23:36:18 UTC 2009
On Tue, 28 Apr 2009, Alasdair G Kergon wrote:
> In other words, I'm asking for it to be defined and documented what the
> target map function receives as input for one of these flush requests.
>
> Alasdair
> --
> agk at redhat.com
It receives what it's set in dm_flush and __clone_and_map_empty_barrier.
bio is standard zero barrier with set bi_bdev and bi_rw.
tio->info.flush_request is the sequence number of the request. (typical
devices require just one request, dm_stripe asks for several requests for
each striped device).
Mikulas
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