btrfs: rw_devices shouldn't be incremented for seed fs in btrfs_rm_dev_replace_srcdev()

seed fs devices don't participate as rw_device, so don't increment
rw_devices when the device being handled belongs to a seed fs.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Chris Mason <clm@fb.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 94a0d186de4c..8482396056ee 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1832,7 +1832,8 @@ void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
         fs_devices->num_devices--;
         if (srcdev->missing) {
                 fs_devices->missing_devices--;
-                fs_devices->rw_devices++;
+                if (!fs_devices->seeding)
+                        fs_devices->rw_devices++;
         }
         if (srcdev->can_discard)
                 fs_devices->num_can_discard--;