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 [thread overview]
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)
next prev parent reply other threads:[~2019-12-04 13:37 UTC|newest]
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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