lkml.org 
[lkml]   [2012]   [Aug]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [patch 1/2]block: handle merged discard request
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.


\
 
 \ /
  Last update: 2012-08-20 17:01    [W:0.073 / U:0.488 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site