Hi Greg and stable team,

Here's a backport of relocation fixes that went into 5.16 aimed at the 5.15.x
series of stable kernels. It's a problem people are currently running into
when using btrfs on a zoned block device.

The following patches have been backported:
960a3166aed0 ("btrfs: zoned: allow preallocation for relocation inodes")
2adada886b26 ("btrfs: check for relocation inodes on zoned btrfs in should_nocow")
e6d261e3b1f7 ("btrfs: zoned: use regular writes for relocation")
35156d852762 ("btrfs: zoned: only allow one process to add pages to a relocation inode")
c2707a255623 ("btrfs: zoned: add a dedicated data relocation block group")
37f00a6d2e9c ("btrfs: introduce btrfs_is_data_reloc_root")

The backport has seen the usual regression testing with xfstests.

Johannes Thumshirn (6):
  btrfs: introduce btrfs_is_data_reloc_root
  btrfs: zoned: add a dedicated data relocation block group
  btrfs: zoned: only allow one process to add pages to a relocation
    inode
  btrfs: zoned: use regular writes for relocation
  btrfs: check for relocation inodes on zoned btrfs in should_nocow
  btrfs: zoned: allow preallocation for relocation inodes

 fs/btrfs/block-group.c |  1 +
 fs/btrfs/ctree.h       | 12 +++++++++
 fs/btrfs/disk-io.c     |  3 ++-
 fs/btrfs/extent-tree.c | 56 +++++++++++++++++++++++++++++++++++++++---
 fs/btrfs/extent_io.c   | 11 +++++++++
 fs/btrfs/inode.c       | 29 +++++++++++++---------
 fs/btrfs/relocation.c  | 38 +++-------------------------
 fs/btrfs/zoned.c       | 21 ++++++++++++++++
 fs/btrfs/zoned.h       |  3 +++
 9 files changed, 123 insertions(+), 51 deletions(-)

-- 
2.32.0