[PATCH v2 0/2] btrfs: match device by dev_t

[Anand Jain <anand.jain@oracle.com>]

Patch 1 is the actual bug fix and should go to stable 5.4 as well.
On 5.4 patch1 conflicts (outside of the changes in the patch),
so not yet marked for the stable.

Patch 2 simplifies calling lookup_bdev() in the device_matched()
by moving the same to the parent function two levels up.

Patch 2 is not merged with 1 because to keep the patch 1 changes local
to a function so that it can be easily backported to 5.4 and 5.10.

We should save the dev_t in struct btrfs_device with that may be
we could clean up a few more things, including fixing the below sparse
warning.

  sparse: sparse: incorrect type in argument 1 (different address spaces)

For using without rcu:

  error = lookup_bdev(device->name->str, &dev_old); 

Anand Jain (2):
  btrfs: harden identification of the stale device
  btrfs: redeclare btrfs_stale_devices arg1 to dev_t

 fs/btrfs/super.c   |  8 +++++-
 fs/btrfs/volumes.c | 72 +++++++++++++++++++++++++++++++++-------------
 fs/btrfs/volumes.h |  2 +-
 3 files changed, 60 insertions(+), 22 deletions(-)

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2.33.1