Re: [PATCH v4 0/4] btrf_show_devname related fixes

On Mon, Aug 23, 2021 at 07:31:38PM +0800, Anand Jain wrote:

These fixes are inspired by the bug report and its discussions in the
mailing list subject
 btrfs: traverse seed devices if fs_devices::devices is empty in show_devname

And depends on the patch
 [PATCH v2] btrfs: fix lockdep warning while mounting sprout fs
in the ML

v4:
 Fix unrelated changes in 2/4
v3:
 Fix rcu_lock in the patch 3/4

Anand Jain (4):
  btrfs: consolidate device_list_mutex in prepare_sprout to its parent
  btrfs: save latest btrfs_device instead of its block_device in
    fs_devices
  btrfs: use latest_dev in btrfs_show_devname
  btrfs: update latest_dev when we sprout

Patchset survived one round of fstests and I haven't seen the lockdep
warning in btrfs/020 that's caused by some unrelated work in loop device
driver. There's a series from Josef to fix it by shuffling locking, so
it would be interesting to see where's the difference.