block: Fix the bio.bi_opf comment

[ Upstream commit 5d2ae14276e698c76fa0c8ce870103f343b38263 ]

Commit ef295ecf090d modified the Linux kernel such that the bottom bits
of the bi_opf member contain the operation instead of the topmost bits.
That commit did not update the comment next to bi_opf. Hence this patch.

From commit ef295ecf090d:
-#define bio_op(bio)    ((bio)->bi_opf >> BIO_OP_SHIFT)
+#define bio_op(bio)    ((bio)->bi_opf & REQ_OP_MASK)

Cc: Christoph Hellwig <hch@lst.de>
Cc: Ming Lei <ming.lei@redhat.com>
Fixes: ef295ecf090d ("block: better op and flags encoding")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220511235152.1082246-1-bvanassche@acm.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index be622b5a21ed5c57e3793a1a8c68a470c8b1dc34..17c92c0f15b20defc38f61606cef877eaffe84cd 100644 (file)
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -215,9 +215,8 @@ static inline void bio_issue_init(struct bio_issue *issue,
 struct bio {
        struct bio              *bi_next;       /* request queue link */
        struct block_device     *bi_bdev;
-       unsigned int            bi_opf;         /* bottom bits req flags,
-                                                * top bits REQ_OP. Use
-                                                * accessors.
+       unsigned int            bi_opf;         /* bottom bits REQ_OP, top bits
+                                                * req_flags.
                                                 */
        unsigned short          bi_flags;       /* BIO_* below */
        unsigned short          bi_ioprio;