target/linux/generic/patches-2.6.31/004-squashfs_add_decompressor_lzma_lzo.patch

   1 From 1885ca0a1973944684f252094a703b7c80dfc974 Mon Sep 17 00:00:00 2001
   2 From: Phillip Lougher <phillip@lougher.demon.co.uk>
   3 Date: Wed, 14 Oct 2009 03:58:11 +0100
   4 Subject: [PATCH] Squashfs: add decompressor entries for lzma and lzo
   5
   6 Add knowledge of lzma/lzo compression formats to the decompressor
   7 framework.  For now these are added as unsupported.  Without
   8 these entries lzma/lzo compressed filesystems will be flagged as
   9 having unknown compression which is undesirable.
  10
  11 Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
  12 ---
  13  fs/squashfs/decompressor.c |   10 ++++++++++
  14  fs/squashfs/squashfs_fs.h  |    4 +++-
  15  2 files changed, 13 insertions(+), 1 deletions(-)
  16
  17 --- a/fs/squashfs/decompressor.c
  18 +++ b/fs/squashfs/decompressor.c
  19 @@ -36,12 +36,22 @@
  20   * Squashfs, allowing multiple decompressors to be easily supported
  21   */
  22
  23 +static const struct squashfs_decompressor squashfs_lzma_unsupported_comp_ops = {
  24 +       NULL, NULL, NULL, LZMA_COMPRESSION, "lzma", 0
  25 +};
  26 +
  27 +static const struct squashfs_decompressor squashfs_lzo_unsupported_comp_ops = {
  28 +       NULL, NULL, NULL, LZO_COMPRESSION, "lzo", 0
  29 +};
  30 +
  31  static const struct squashfs_decompressor squashfs_unknown_comp_ops = {
  32         NULL, NULL, NULL, 0, "unknown", 0
  33  };
  34
  35  static const struct squashfs_decompressor *decompressor[] = {
  36         &squashfs_zlib_comp_ops,
  37 +       &squashfs_lzma_unsupported_comp_ops,
  38 +       &squashfs_lzo_unsupported_comp_ops,
  39         &squashfs_unknown_comp_ops
  40  };
  41
  42 --- a/fs/squashfs/squashfs_fs.h
  43 +++ b/fs/squashfs/squashfs_fs.h
  44 @@ -211,7 +211,9 @@ struct meta_index {
  45  /*
  46   * definitions for structures on disk
  47   */
  48 -#define ZLIB_COMPRESSION        1
  49 +#define ZLIB_COMPRESSION       1
  50 +#define LZMA_COMPRESSION       2
  51 +#define LZO_COMPRESSION                3
  52
  53  struct squashfs_super_block {
  54         __le32                  s_magic;