[0/4] btrfs: zoned: fixes for zone finishing

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Naohiro Aota April 28, 2022, 3:02 p.m. UTC

Commit be1a1d7a5d24 ("btrfs: zoned: finish fully written block group")
introduced zone finishing a block group when the IO reaches at the end of
the block group. However, since the zone capacity may not aligned to 16KB
(node size), we can leave an un-allocatable space at the end of a block
group. Also, it turned out that metadata zone finishing never works
actually.

This series addresses these issues by rewriting metadata zone finishing
code to use a workqueue to process the finishing work.

Patch 1 is a clean-up patch to consolidate zone finishing function for
better maintainability.

Patch 2 changes the left region calculation so that it finishes a block
group when there is no more space left for allocation.

Patch 3 fixes metadata block group finishing which is not actually working.

Patch 4 implements zone finishing of an unused block group and fixes active
block group accounting. This patch is a bit unrelated to other ones. But,
the patch is tested with the previous patches applied, so let me go with
the same series.

Naohiro Aota (4):
  btrfs: zoned: consolidate zone finish function
  btrfs: zoned: finish BG when there are no more allocatable bytes left
  btrfs: zoned: properly finish block group on metadata write
  btrfs: zoned: zone finish unused block group

 fs/btrfs/block-group.c |   8 ++
 fs/btrfs/block-group.h |   2 +
 fs/btrfs/extent_io.c   |   6 +-
 fs/btrfs/extent_io.h   |   1 -
 fs/btrfs/zoned.c       | 163 +++++++++++++++++++++++------------------
 fs/btrfs/zoned.h       |   5 ++
 6 files changed, 109 insertions(+), 76 deletions(-)