Re: [PATCH 02/10] [SG] Update block layer to use sg helpers

From: John Stoffel
Date: Tue Oct 23 2007 - 10:32:57 EST


>>>>> "Jens" == Jens Axboe <jens.axboe@xxxxxxxxxx> writes:

Jens> Signed-off-by: Jens Axboe <jens.axboe@xxxxxxxxxx>
Jens> ---
Jens> block/ll_rw_blk.c | 8 ++++++--
Jens> 1 files changed, 6 insertions(+), 2 deletions(-)

Jens> diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
Jens> index 8025d64..61c2e39 100644
Jens> --- a/block/ll_rw_blk.c
Jens> +++ b/block/ll_rw_blk.c
Jens> @@ -1354,8 +1354,9 @@ new_segment:
Jens> else
Jens> sg = sg_next(sg);

Jens> - memset(sg, 0, sizeof(*sg));
Jens> - sg->page = bvec->bv_page;
Jens> + sg_dma_len(sg) = 0;
Jens> + sg_dma_address(sg) = 0;

Why don't you call these something like sg_set_dma_len() and
sg_set_dma_address() instead, to make it clear these set the values
and don't read them?

Jens> + sg_set_page(sg, bvec->bv_page);

Esp since you have the sg_set_page() right below it.


sg-> length = nbytes;
sg-> offset = bvec->bv_offset;
Jens> nsegs++;
Jens> @@ -1363,6 +1364,9 @@ new_segment:
Jens> bvprv = bvec;
Jens> } /* segments in rq */

Jens> + if (sg)
Jens> + __sg_mark_end(sg);
Jens> +
Jens> return nsegs;
Jens> }

Jens> --
Jens> 1.5.3.GIT

Jens> -
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