On 2020/6/17 上午3:25, Josef Bacik wrote: > On 6/15/20 10:17 PM, Qu Wenruo wrote: >> btrfs_root::anon_dev is an indicator for different subvolume namespaces. >> Thus it should always be initialized to an anonymous block device. >> >> Add a safe net to catch such uninitialized values. >> >> Signed-off-by: Qu Wenruo <wqu@xxxxxxxx> > > Can we handle stat->dev not having a device set? Or will this blow up > in other ways? Thanks, We can handle it without any problem, just users get confused. As a common practice, we use different bdev as a namespace for different subvolumes. Without a valid bdev, some user space tools may not be able to distinguish inodes in different subvolumes. Thanks, Qu > > Josef
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