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authorChristoph Hellwig <hch@lst.de>2020-04-14 09:42:21 +0200
committerJens Axboe <axboe@kernel.dk>2020-04-22 10:47:06 -0600
commite64a0e16928415648d53d721b3d6fc3635eddf92 (patch)
treebfb5f00ddd9a5dfb7883fc0dd5280342ed3706f1 /block/blk-map.c
parent9bc5c397d8384b50c8202f4400bf2f87fe8291d9 (diff)
downloadlinux-e64a0e16928415648d53d721b3d6fc3635eddf92.tar.bz2
block: remove RQF_COPY_USER
The RQF_COPY_USER is set for bio where the passthrough request mapping helpers decided that bounce buffering is required. It is then used to pad scatterlist for drivers that required it. But given that non-passthrough requests are per definition aligned, and directly mapped pass-through request must be aligned it is not actually required at all. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-map.c')
-rw-r--r--block/blk-map.c9
1 files changed, 1 insertions, 8 deletions
diff --git a/block/blk-map.c b/block/blk-map.c
index b72c361911a4..b6fa343fea9f 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -654,8 +654,6 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq,
bio = rq->bio;
} while (iov_iter_count(&i));
- if (!bio_flagged(bio, BIO_USER_MAPPED))
- rq->rq_flags |= RQF_COPY_USER;
return 0;
unmap_rq:
@@ -731,7 +729,6 @@ int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf,
{
int reading = rq_data_dir(rq) == READ;
unsigned long addr = (unsigned long) kbuf;
- int do_copy = 0;
struct bio *bio, *orig_bio;
int ret;
@@ -740,8 +737,7 @@ int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf,
if (!len || !kbuf)
return -EINVAL;
- do_copy = !blk_rq_aligned(q, addr, len) || object_is_on_stack(kbuf);
- if (do_copy)
+ if (!blk_rq_aligned(q, addr, len) || object_is_on_stack(kbuf))
bio = bio_copy_kern(q, kbuf, len, gfp_mask, reading);
else
bio = bio_map_kern(q, kbuf, len, gfp_mask);
@@ -752,9 +748,6 @@ int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf,
bio->bi_opf &= ~REQ_OP_MASK;
bio->bi_opf |= req_op(rq);
- if (do_copy)
- rq->rq_flags |= RQF_COPY_USER;
-
orig_bio = bio;
ret = blk_rq_append_bio(rq, &bio);
if (unlikely(ret)) {