From:   Fedor Pchelkin <pchelkin@ispras.ru>
To:     stable@vger.kernel.org,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     Fedor Pchelkin <pchelkin@ispras.ru>, Jens Axboe <axboe@kernel.dk>,
        Christoph Hellwig <hch@lst.de>,
        Chaitanya Kulkarni <kch@nvidia.com>,
        Johannes Thumshirn <johannes.thumshirn@wdc.com>,
        linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
        lvc-project@linuxtesting.org,
        Alexey Khoroshilov <khoroshilov@ispras.ru>
Subject: [PATCH v2 5.10] block: fix and cleanup bio_check_ro
Date:   Tue, 31 Jan 2023 16:25:38 +0300
Message-Id: <20230131132538.860037-1-pchelkin@ispras.ru>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Christoph Hellwig <hch@lst.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@lst.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20220304180105.409765-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
[the formatted string layout is not changed because struct bio hasn't
got bi_bdev field in stable branches older than 5.15]
Signed-off-by: Fedor Pchelkin <pchelkin@ispras.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 26664f2a139e..9afb79b322fb 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -700,9 +700,7 @@ 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,
-		       "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;
-- 
2.30.2