[Ocfs2-devel] [PATCH 0/5 v4] fiemap: introduce EXTENT_DATA_COMPRESSED flag

[David Sterba]

The original FIEMAP patch did not define this bit, btrfs will make use of
it.  The defined constant maintains the same value as originally proposed.

Currently, the 'filefrag' utility has no way to recognize and denote a
compressed extent. As implemented in btrfs right now, the compression step
splits a big extent into smaller chunks and this is reported as a heavily
fragmented file. Adding the flag to filefrag will at least give some
explanation why, this has been confusing users for some time already.

fiemap_fill_next_extent is extended and takes argument to fill the physical
length.

V4:
The physical length is always set and equal to logical, or different and
then sets the COMPRESSED flag.
fiemap_extent::fe_length renamed to fe_logi_length

V3:
Based on feedback from Andreas, implement #1 from V2, current users of
fiemap_fill_next_extent (fs/, ext4, gfs2, ocfs2, nilfs2, xfs) updated
accordingly, no functional change.

V2:
Based on feedback from Andreas, the fiemap_extent is now able to hold the
physical extent length, to be filled by the filesystem callback.


1) extend fiemap_fill_next_extent to take phys_length and update all
   users (ext4, gfs2, ocfs2, nilfs2, xfs)

David Sterba (5):
  fiemap: fix comment at EXTENT_DATA_ENCRYPTED
  fiemap: add EXTENT_DATA_COMPRESSED flag
  btrfs: set FIEMAP_EXTENT_DATA_COMPRESSED for compressed extents
  Documentation/fiemap: Document the DATA_COMPRESSED flag
  fiemap: rename fe_length to fe_logi_length

 Documentation/filesystems/fiemap.txt | 19 +++++++++++++++----
 fs/btrfs/extent_io.c                 |  8 ++++++--
 fs/ext4/extents.c                    |  3 ++-
 fs/ext4/inline.c                     |  2 +-
 fs/gfs2/inode.c                      |  2 +-
 fs/ioctl.c                           | 29 ++++++++++++++++++++++-------
 fs/nilfs2/inode.c                    |  8 +++++---
 fs/ocfs2/extent_map.c                |  4 ++--
 fs/xfs/xfs_iops.c                    |  2 +-
 include/linux/fs.h                   |  2 +-
 include/uapi/linux/fiemap.h          | 13 ++++++++++---
 11 files changed, 66 insertions(+), 26 deletions(-)

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1.8.4.5