[PATCH v4 1/2] btrfs: decrement number of open devices after closing the device not before

[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 d8e5560db285..2398b071bcf6 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1067,9 +1067,6 @@ 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);
@@ -1080,6 +1077,8 @@ 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);
-- 
2.16.4