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authorKeith Busch <kbusch@kernel.org>2022-06-10 22:58:26 +0300
committerJens Axboe <axboe@kernel.dk>2022-06-27 15:29:11 +0300
commit9cfe3ddecdc556ab1d1693b29e8a26ba80953ccc (patch)
tree6442d3c8a80f4584e5fa7397b48acde380a3fb3f /block/bounce.c
parent67927d22015060967122facc8cfeaad8012e8808 (diff)
downloadlinux-9cfe3ddecdc556ab1d1693b29e8a26ba80953ccc.tar.xz
block/bounce: count bytes instead of sectors
Individual bv_len's may not be a sector size. Signed-off-by: Keith Busch <kbusch@kernel.org> Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Reviewed-by: Pankaj Raghav <p.raghav@samsung.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20220610195830.3574005-8-kbusch@fb.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/bounce.c')
-rw-r--r--block/bounce.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/block/bounce.c b/block/bounce.c
index 8f7b6fe3b4db..c8f487af7be3 100644
--- a/block/bounce.c
+++ b/block/bounce.c
@@ -205,19 +205,26 @@ void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig)
int rw = bio_data_dir(*bio_orig);
struct bio_vec *to, from;
struct bvec_iter iter;
- unsigned i = 0;
+ unsigned i = 0, bytes = 0;
bool bounce = false;
- int sectors = 0;
+ int sectors;
bio_for_each_segment(from, *bio_orig, iter) {
if (i++ < BIO_MAX_VECS)
- sectors += from.bv_len >> 9;
+ bytes += from.bv_len;
if (PageHighMem(from.bv_page))
bounce = true;
}
if (!bounce)
return;
+ /*
+ * Individual bvecs might not be logical block aligned. Round down
+ * the split size so that each bio is properly block size aligned,
+ * even if we do not use the full hardware limits.
+ */
+ sectors = ALIGN_DOWN(bytes, queue_logical_block_size(q)) >>
+ SECTOR_SHIFT;
if (sectors < bio_sectors(*bio_orig)) {
bio = bio_split(*bio_orig, sectors, GFP_NOIO, &bounce_bio_split);
bio_chain(bio, *bio_orig);