[PATCH v2 02/51] block: loop: comment on direct access to bvec table
STALE3382d
From: Ming Lei <hidden>
Date: 2017-06-26 12:09:45
Also in:
linux-fsdevel, linux-mm, lkml
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
Revision v2 of 7 in this series.
Revisions (7)
Signed-off-by: Ming Lei <redacted> --- drivers/block/loop.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 0de11444e317..88063ab17e9a 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c@@ -487,6 +487,11 @@ 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));
--
2.9.4