From: Christoph Hellwig <hch@lst.de>
Date: Mon, 16 May 2022 08:36:54 +0200
Subject: [PATCH] block: cleanup the VM accounting in submit_bio
Git-commit: a3e7689bfaae031177ebbb257d5a704b47236044
Patch-mainline: v5.19-rc1
References: jsc#PED-1183

submit_bio uses some extremely convoluted checks and confusing comments
to only account REQ_OP_READ/REQ_OP_WRITE comments.  Just switch to the
plain obvious checks instead.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220516063654.2782792-1-hch@lst.de
[axboe: fixup WRITE -> REQ_OP_WRITE]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Hannes Reinecke <hare@suse.com>
---
 block/blk-core.c | 18 +++++-------------
 1 file changed, 5 insertions(+), 13 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index c3f1e46ddd43..23312df7d25d 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -892,19 +892,11 @@ void submit_bio(struct bio *bio)
 	if (blkcg_punt_bio_submit(bio))
 		return;
 
-	/*
-	 * If it's a regular read/write or a barrier with data attached,
-	 * go through the normal accounting stuff before submission.
-	 */
-	if (bio_has_data(bio)) {
-		unsigned int count = bio_sectors(bio);
-
-		if (op_is_write(bio_op(bio))) {
-			count_vm_events(PGPGOUT, count);
-		} else {
-			task_io_account_read(bio->bi_iter.bi_size);
-			count_vm_events(PGPGIN, count);
-		}
+	if (bio_op(bio) == REQ_OP_READ) {
+		task_io_account_read(bio->bi_iter.bi_size);
+		count_vm_events(PGPGIN, bio_sectors(bio));
+	} else if (bio_op(bio) == REQ_OP_WRITE) {
+		count_vm_events(PGPGOUT, bio_sectors(bio));
 	}
 
 	/*
-- 
2.35.3