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From: Johannes Thumshirn <jth@kernel.org>
To: David Sterba <dsterba@suse.com>
Cc: Nikolay Borisov <nborisov@suse.com>, Qu Wenruo <wqu@suse.com>,
	Linux BTRFS Mailinglist <linux-btrfs@vger.kernel.org>,
	Johannes Thumshirn <jthumshirn@suse.de>
Subject: [PATCH v5 1/2] btrfs: decrement number of open devices after closing the device not before
Date: Wed,  4 Dec 2019 14:36:38 +0100
Message-ID: <20191204133639.2382-2-jth@kernel.org> (raw)
In-Reply-To: <20191204133639.2382-1-jth@kernel.org>

From: Johannes Thumshirn <jthumshirn@suse.de>

In btrfs_close_one_device we're decrementing the number of open devices
before we're calling btrfs_close_bdev().

As there is no intermediate exit between these points in this function it
is technically OK to do so, but it makes the code a bit harder to understand.

Move both operations closer together and move the decrement step after
btrfs_close_bdev().

Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Qu Wenruo <wqu@suse.com>
---
 fs/btrfs/volumes.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index c565650639ee..ae3980ba3a87 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1069,9 +1069,6 @@ static void btrfs_close_one_device(struct btrfs_device *device)
 	struct btrfs_device *new_device;
 	struct rcu_string *name;
 
-	if (device->bdev)
-		fs_devices->open_devices--;
-
 	if (test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state) &&
 	    device->devid != BTRFS_DEV_REPLACE_DEVID) {
 		list_del_init(&device->dev_alloc_list);
@@ -1082,6 +1079,8 @@ static void btrfs_close_one_device(struct btrfs_device *device)
 		fs_devices->missing_devices--;
 
 	btrfs_close_bdev(device);
+	if (device->bdev)
+		fs_devices->open_devices--;
 
 	new_device = btrfs_alloc_device(NULL, &device->devid,
 					device->uuid);
-- 
2.20.1 (Apple Git-117)


  reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-04 13:36 [PATCH v5 0/2] remove BUG_ON()s in btrfs_close_one_device() Johannes Thumshirn
2019-12-04 13:36 ` Johannes Thumshirn [this message]
2019-12-04 13:36 ` [PATCH v5 2/2] btrfs: reset device back to allocation state when removing Johannes Thumshirn
2019-12-10 10:10 ` [PATCH v5 0/2] remove BUG_ON()s in btrfs_close_one_device() David Sterba

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