Squashfs: add decompressor entries for lzma and lzo

Add knowledge of lzma/lzo compression formats to the decompressor
framework.  For now these are added as unsupported.  Without
these entries lzma/lzo compressed filesystems will be flagged as
having unknown compression which is undesirable.

Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>

diff --git a/fs/squashfs/decompressor.c b/fs/squashfs/decompressor.c
index 0072ccd..157478d 100644 (file)
--- a/fs/squashfs/decompressor.c
+++ b/fs/squashfs/decompressor.c
@@ -36,12 +36,22 @@
  * Squashfs, allowing multiple decompressors to be easily supported
  */
 
+static const struct squashfs_decompressor squashfs_lzma_unsupported_comp_ops = {
+       NULL, NULL, NULL, LZMA_COMPRESSION, "lzma", 0
+};
+
+static const struct squashfs_decompressor squashfs_lzo_unsupported_comp_ops = {
+       NULL, NULL, NULL, LZO_COMPRESSION, "lzo", 0
+};
+
 static const struct squashfs_decompressor squashfs_unknown_comp_ops = {
        NULL, NULL, NULL, 0, "unknown", 0
 };
 
 static const struct squashfs_decompressor *decompressor[] = {
        &squashfs_zlib_comp_ops,
+       &squashfs_lzma_unsupported_comp_ops,
+       &squashfs_lzo_unsupported_comp_ops,
        &squashfs_unknown_comp_ops
 };
 

diff --git a/fs/squashfs/squashfs_fs.h b/fs/squashfs/squashfs_fs.h
index 283daaf..36e1604 100644 (file)
--- a/fs/squashfs/squashfs_fs.h
+++ b/fs/squashfs/squashfs_fs.h
@@ -211,7 +211,9 @@ struct meta_index {
 /*
  * definitions for structures on disk
  */
-#define ZLIB_COMPRESSION        1
+#define ZLIB_COMPRESSION       1
+#define LZMA_COMPRESSION       2
+#define LZO_COMPRESSION                3
 
 struct squashfs_super_block {
        __le32                  s_magic;