[RFC PATCH v0 0/4] erofs-utils: add LZMA fixed-sized output compression support

[Gao Xiang via Linux-erofs <linux-erofs@lists.ozlabs.org>]

From: Gao Xiang <hsiangkao@aol.com>

Hi folks,

Thanks to Lasse, liblzma finally has a preliminary usable fixed-sized
output compression support. I've made a quick integration and it seems
work. The preliminary C/R result of this is:
 459382784  enwik9_4k.squashfs.xz.img
 401649664  enwik9_8k.squashfs.xz.img
 371617792  enwik9_4k.lzma.erofs.img
 360972288  enwik9_16k.squashfs.xz.img

* Also -zlzma,1,
 389115904  enwik9_4k.lzma.erofs.img

So it's worthwhile to take the further step and get an entire solution.

TODOs:
 - make a formal configure.ac / Makefile.am rather than such hack;
 - save DICT_SIZE to super block rather than using a fixed value;
 - support threaded compression to boost up build time (including
   segment compression);
 - look on sorting out kernel side support.

Thanks,
Gao Xiang

Cc: Lasse Collin <lasse.collin@tukaani.org>

Gao Xiang (4):
  erofs-utils: clevel set up as an individual function
  erofs-utils: add liblzma dependency
  erofs-utils: mkfs: add LZMA algorithm support
  erofs-utils: fuse: add LZMA algorithm support

 fuse/Makefile.am         |  2 +-
 include/erofs_fs.h       |  3 +-
 lib/Makefile.am          |  2 +
 lib/compress.c           | 16 ++++---
 lib/compressor.c         | 23 +++++++---
 lib/compressor.h         |  7 ++-
 lib/compressor_liblzma.c | 93 ++++++++++++++++++++++++++++++++++++++++
 lib/compressor_lz4.c     |  1 -
 lib/compressor_lz4hc.c   | 21 ++++++---
 lib/data.c               |  7 +--
 lib/decompress.c         | 62 +++++++++++++++++++++++++++
 mkfs/Makefile.am         |  2 +-
 12 files changed, 211 insertions(+), 28 deletions(-)
 create mode 100644 lib/compressor_liblzma.c

-- 
2.24.0