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Date: Sat, 29 Oct 2016 16:08:14 +0800 From: Ming Lei <tom.leiming@...il.com> To: Jens Axboe <axboe@...com>, linux-kernel@...r.kernel.org Cc: linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org, Christoph Hellwig <hch@...radead.org>, "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>, Ming Lei <tom.leiming@...il.com>, Hannes Reinecke <hare@...e.com>, Mike Christie <mchristi@...hat.com>, Minfei Huang <mnghuan@...il.com>, Petr Mladek <pmladek@...e.com> Subject: [PATCH 15/60] block: loop: comment on direct access to bvec table Signed-off-by: Ming Lei <tom.leiming@...il.com> --- drivers/block/loop.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/block/loop.c b/drivers/block/loop.c index fa1b7a90ba11..55ce4226590d 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -485,6 +485,11 @@ static int lo_rw_aio(struct loop_device *lo, struct loop_cmd *cmd, /* nomerge for loop request queue */ WARN_ON(cmd->rq->bio != cmd->rq->biotail); + /* + * For multipage bvec support, it is safe to pass the bvec + * table to iov iterator, because iov iter still uses bvec + * iter helpers to travese bvec. + */ bvec = __bvec_iter_bvec(bio->bi_io_vec, bio->bi_iter); iov_iter_bvec(&iter, ITER_BVEC | rw, bvec, bio_segments(bio), blk_rq_bytes(cmd->rq)); -- 2.7.4
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