linux-kernel - [PATCH] bdev: reset first_open when looping in __blkget

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Date:   Tue, 17 Dec 2019 19:04:28 +0100
From:   Michal Suchanek <msuchanek@...e.de>
To:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Michal Suchanek <msuchanek@...e.de>
Subject: [PATCH] bdev: reset first_open when looping in __blkget_dev

It is not clear that no other thread cannot open the block device when
__blkget_dev drops it and loop to restart label. Reset first_open to
false when looping.

Signed-off-by: Michal Suchanek <msuchanek@...e.de>
---
 fs/block_dev.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 69bf2fb6f7cd..17e1231d5246 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1560,7 +1560,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
 	int ret;
 	int partno;
 	int perm = 0;
-	bool first_open = false;
+	bool first_open;
 
 	if (mode & FMODE_READ)
 		perm |= MAY_READ;
@@ -1580,6 +1580,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
  restart:
 
 	ret = -ENXIO;
+	first_open = false;
 	disk = bdev_get_gendisk(bdev, &partno);
 	if (!disk)
 		goto out;
-- 
2.23.0