Messages in this thread | | | Date | Mon, 20 Aug 2012 10:12:29 -0400 | From | Mike Snitzer <> | Subject | Re: [patch 1/2]block: handle merged discard request |
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On Mon, Aug 20 2012 at 9:58am -0400, Christoph Hellwig <hch@infradead.org> wrote:
> 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.
Thought we pushed that down? Hence sd_setup_discard_cmnd's alloc_page + blk_add_request_payload hack.
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