From: Baolin Liu <liubaolin@kylinos.cn>

This series improves mballoc statistics reporting and control by adding
blocks_allocated to /proc/fs/ext4/<dev>/mb_stats, using
READ_ONCE()/WRITE_ONCE() for concurrent accesses to s_mb_stats, and
allowing mballoc stats to be controlled through
/proc/fs/ext4/<dev>/mb_stats.

Changes in v6:
 - Serialize proc and sysfs updates to s_mb_stats with a mutex so that
   clearing mb_stats through the proc control path cannot race with
   concurrent administrative writes.

Baolin Liu (3):
  ext4: add blocks_allocated to mb_stats output
  ext4: use READ_ONCE/WRITE_ONCE for s_mb_stats
  ext4: allow controlling mballoc stats through proc mb_stats

 Documentation/ABI/testing/sysfs-fs-ext4 |  3 +-
 Documentation/admin-guide/ext4.rst      |  9 ++-
 Documentation/filesystems/proc.rst      | 13 +---
 fs/ext4/ext4.h                          |  2 +
 fs/ext4/mballoc.c                       | 58 ++++++++++++++----
 fs/ext4/sysfs.c                         | 80 ++++++++++++++++++++++++-
 6 files changed, 135 insertions(+), 30 deletions(-)

-- 
2.51.0