The missing devices are accounted by its own fs device, for example
the missing devices in seed filesystem will be accounted by the fs device
of the seed filesystem, not by the new filesystem which is based on
the seed filesystem, so when we remove the missing device in the
seed filesystem, we should decrease the counter of its own fs device.
Fix it.

Signed-off-by: Miao Xie <mi...@cn.fujitsu.com>
---
This patch is against:
[PATCH 8/9] Btrfs: fix unzeroed members in fs_devices when creating a fs from 
seed fs
---
 fs/btrfs/volumes.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index daecfa5..4cfbe76 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1723,7 +1723,7 @@ int btrfs_rm_device(struct btrfs_root *root, char 
*device_path)
        device->fs_devices->total_devices--;
 
        if (device->missing)
-               root->fs_info->fs_devices->missing_devices--;
+               device->fs_devices->missing_devices--;
 
        next_device = list_entry(root->fs_info->fs_devices->devices.next,
                                 struct btrfs_device, dev_list);
-- 
1.9.3

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