[PATCH v2 0/5] fiemap extension for more physical information

[Sweet Tea Dorminy <sweettea-kernel@dorminy.me>]

For many years, various btrfs users have written programs to discover
the actual disk space used by files, using root-only interfaces.
However, this information is a great fit for fiemap: it is inherently
tied to extent information, all filesystems can use it, and the
capabilities required for FIEMAP make sense for this additional
information also.

Hence, this patchset adds various additional information to fiemap,
and extends btrfs to return it.  This uses some of the reserved padding
in the fiemap extent structure, so programs unaware of the changes
will be unaffected.

This is based on next-20240325. I've tested the btrfs part of this with
the standard btrfs testing matrix locally, and verified that the physical extent
information returned there is correct.

Changelog:

v2:
 - Adopted PHYS_LEN flag and COMPRESSED flag from the previous version,
   as per Andreas Dilger' comment.
   https://patchwork.ozlabs.org/project/linux-ext4/patch/4f8d5dc5b51a43efaf16c39398c23a6276e40a30.1386778303.git.dsterba@suse.cz/

v1: https://lore.kernel.org/linux-fsdevel/20240315030334.GQ6184@frogsfrogsfrogs/T/#t

Sweet Tea Dorminy (5):
  fs: fiemap: add physical_length field to extents
  fs: fiemap: update fiemap_fill_next_extent() signature
  fs: fiemap: add new COMPRESSED extent state
  btrfs: fiemap: emit new COMPRESSED fiemap state.
  btrfs: fiemap: return extent physical size

 Documentation/filesystems/fiemap.rst | 35 ++++++++++----
 fs/bcachefs/fs.c                     |  7 +--
 fs/btrfs/extent_io.c                 | 72 ++++++++++++++++++----------
 fs/ext4/extents.c                    |  1 +
 fs/f2fs/data.c                       |  8 ++--
 fs/f2fs/inline.c                     |  3 +-
 fs/ioctl.c                           | 11 +++--
 fs/iomap/fiemap.c                    |  2 +-
 fs/nilfs2/inode.c                    |  6 +--
 fs/ntfs3/frecord.c                   |  7 +--
 fs/ocfs2/extent_map.c                |  4 +-
 fs/smb/client/smb2ops.c              |  1 +
 include/linux/fiemap.h               |  2 +-
 include/uapi/linux/fiemap.h          | 34 ++++++++++---
 14 files changed, 130 insertions(+), 63 deletions(-)


base-commit: 1fdad13606e104ff103ca19d2d660830cb36d43e
-- 
2.43.0