Re: [patch 1/2]block: handle merged discard request

[Christoph Hellwig]

On Mon, Aug 20, 2012 at 09:57:39AM -0400, Mike Snitzer wrote:
> But I haven't put my finger on _why_ a discard bio has bio->bi_io_vec
> (but given my use of DM, bio comes from bio_alloc_bioset, and DM passes
> original bio->bi_max_vecs for nr_iovecs).

TRIM has a payload and we cheay by preallocation a data page for it.

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