This series fixes a free-NID shrinker underflow and prepares selected
on-disk metadata structures for filesystem blocks whose size can differ
from PAGE_SIZE.

Patch 1 compares the free-NID count with its retention threshold before
subtraction, avoiding unsigned underflow.

Patches 2-5 make the SIT, orphan, dentry, and inode-node layouts describe
their runtime block-size geometry while preserving the current on-disk
format and behavior.

These are preparatory layout-only changes; the runtime geometry conversion
will follow separately.

Kelvin Zhang (5):
  f2fs: avoid underflow when counting free NIDs
  f2fs: describe SIT block layout dynamically
  f2fs: describe orphan block layout dynamically
  f2fs: describe dentry block layout dynamically
  f2fs: describe inode node layout dynamically

 fs/f2fs/checkpoint.c    | 46 +++++++++++-----------
 fs/f2fs/data.c          |  2 +-
 fs/f2fs/dir.c           | 51 +++++++++++++------------
 fs/f2fs/f2fs.h          | 76 +++++++++++++++++++++++++++----------
 fs/f2fs/gc.c            |  2 +-
 fs/f2fs/inline.c        |  5 +--
 fs/f2fs/inode.c         |  5 +--
 fs/f2fs/node.c          |  4 +-
 fs/f2fs/node.h          | 53 ++++++++++++--------------
 fs/f2fs/segment.c       | 15 ++++----
 fs/f2fs/segment.h       | 19 +++++-----
 fs/f2fs/shrinker.c      |  5 ++-
 fs/f2fs/super.c         | 14 ++++++-
 include/linux/f2fs_fs.h | 84 +++++++++++++++++++++++++----------------
 14 files changed, 225 insertions(+), 156 deletions(-)

-- 
2.53.0