linux-kernel - [PATCH 1/2] [PATCH] bcache: cached_dev

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Message-Id: <1575622543-22470-1-git-send-email-liangchen.linux@gmail.com>
Date:   Fri,  6 Dec 2019 16:55:42 +0800
From:   Liang Chen <liangchen.linux@...il.com>
To:     colyli@...e.de
Cc:     kent.overstreet@...il.com, linux-kernel@...r.kernel.org,
        linux-bcache@...r.kernel.org,
        Liang Chen <liangchen.linux@...il.com>
Subject: [PATCH 1/2] [PATCH] bcache: cached_dev_free needs to put the sb page

Same as cache device, the buffer page needs to be put while
freeing cached_dev.  Otherwise a page would be leaked every
time a cached_dev is stopped.

Signed-off-by: Liang Chen <liangchen.linux@...il.com>
---
 drivers/md/bcache/super.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 77e9869345e7..a573ce1d85aa 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1275,6 +1275,9 @@ static void cached_dev_free(struct closure *cl)
 
 	mutex_unlock(&bch_register_lock);
 
+	if (dc->sb_bio.bi_inline_vecs[0].bv_page)
+		put_page(bio_first_page_all(&dc->sb_bio));
+
 	if (!IS_ERR_OR_NULL(dc->bdev))
 		blkdev_put(dc->bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 
-- 
2.17.0