[PATCH v2 0/2] btrfs-progs: cmds/filesystem: add --usage-ratio and --wasted-bytes options

[Qu Wenruo <wqu@suse.com>]

[CHANGELOG]
v2:
- Sync the newer kernel uapi
- Remove the "lone" mentions
  Now the new options would be "--usage-ratio" and "--wasted-bytes".

This the progs support for the new kernel defrag parameters.

This adds 2 new fine tunning parameters, --usage-ratio and
--wasted-bytes.

The ratio is between [0, 100] (aka, percentage value), and wasted bytes
is between [0, U32_MAX], but in reality the value only makes sense below
max file extent size (for both compressed and regular extents).
Any value higher than max file extent size would mostly disable the
wasted bytes check (as it would always be false).

The default usage ratio is 5%, and 16MiB wasted bytes.
If the kernel doesn't support the new options, it would fall back to
the old ioctl flags without the 2 new flags.

Qu Wenruo (2):
  btrfs-progs: defrag: sync the usage ratio/wasted bytes fine-tunning
    from kernel
  btrfs-progs: cmds/filesystem: add --usage-ratio and --wasted-bytes for
    defrag

 Documentation/btrfs-filesystem.rst | 21 ++++++++++++
 cmds/filesystem.c                  | 53 ++++++++++++++++++++++++++++--
 kernel-shared/uapi/btrfs.h         | 39 ++++++++++++++++++++--
 3 files changed, 107 insertions(+), 6 deletions(-)

--
2.44.0