linux-kernel - [PATCH v2 5.4] block: fix and cleanup bio_check

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Date:   Tue, 31 Jan 2023 16:29:50 +0300
From:   Fedor Pchelkin <pchelkin@...ras.ru>
To:     stable@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Fedor Pchelkin <pchelkin@...ras.ru>, Jens Axboe <axboe@...nel.dk>,
        Christoph Hellwig <hch@....de>,
        Chaitanya Kulkarni <kch@...dia.com>,
        Johannes Thumshirn <johannes.thumshirn@....com>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        lvc-project@...uxtesting.org,
        Alexey Khoroshilov <khoroshilov@...ras.ru>
Subject: [PATCH v2 5.4] block: fix and cleanup bio_check_ro

From: Christoph Hellwig <hch@....de>

commit 57e95e4670d1126c103305bcf34a9442f49f6d6a upstream.

Don't use a WARN_ON when printing a potentially user triggered
condition.  Also don't print the partno when the block device name
already includes it, and use the %pg specifier to simplify printing
the block device name.

Signed-off-by: Christoph Hellwig <hch@....de>
Reviewed-by: Chaitanya Kulkarni <kch@...dia.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@....com>
Link: https://lore.kernel.org/r/20220304180105.409765-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@...nel.dk>
[the formatted string layout is not changed because struct bio hasn't
got bi_bdev field in stable branches older than 5.15; generic_make_request
is removed as it is unnecessary]
Signed-off-by: Fedor Pchelkin <pchelkin@...ras.ru>
---
v1->v2: added backport comment

 block/blk-core.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index 5808baa950c3..030de4fdf9b1 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -793,10 +793,7 @@ static inline bool bio_check_ro(struct bio *bio, struct hd_struct *part)
 
 		if (op_is_flush(bio->bi_opf) && !bio_sectors(bio))
 			return false;
-
-		WARN_ONCE(1,
-		       "generic_make_request: Trying to write "
-			"to read-only block-device %s (partno %d)\n",
+		pr_warn("Trying to write to read-only block-device %s (partno %d)\n",
 			bio_devname(bio, b), part->partno);
 		/* Older lvm-tools actually trigger this */
 		return false;
-- 
2.34.1