Squashfs: add a decompressor framework

This adds a decompressor framework which allows multiple compression
algorithms to be cleanly supported.

Also update zlib wrapper and other code to use the new framework.

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

1 files changed, 14 insertions, 3 deletions

diff --git a/fs/squashfs/zlib_wrapper.c b/fs/squashfs/zlib_wrapper.c
index c814594d522e..4dd70e04333b 100644
--- a/fs/squashfs/zlib_wrapper.c
+++ b/fs/squashfs/zlib_wrapper.c
@@ -30,8 +30,9 @@
 #include "squashfs_fs_sb.h"
 #include "squashfs_fs_i.h"
 #include "squashfs.h"
+#include "decompressor.h"
 
-void *squashfs_zlib_init()
+static void *zlib_init(struct squashfs_sb_info *dummy)
 {
         z_stream *stream = kmalloc(sizeof(z_stream), GFP_KERNEL);
         if (stream == NULL)
@@ -50,7 +51,7 @@ failed:
 }
 
 
-void squashfs_zlib_free(void *strm)
+static void zlib_free(void *strm)
 {
         z_stream *stream = strm;
 
@@ -60,7 +61,7 @@ void squashfs_zlib_free(void *strm)
 }
 
 
-int squashfs_zlib_uncompress(struct squashfs_sb_info *msblk, void **buffer,
+static int zlib_uncompress(struct squashfs_sb_info *msblk, void **buffer,
         struct buffer_head **bh, int b, int offset, int length, int srclength,
         int pages)
 {
@@ -137,3 +138,13 @@ release_mutex:
 
         return -EIO;
 }
+
+const struct squashfs_decompressor squashfs_zlib_comp_ops = {
+        .init = zlib_init,
+        .free = zlib_free,
+        .decompress = zlib_uncompress,
+        .id = ZLIB_COMPRESSION,
+        .name = "zlib",
+        .supported = 1
+};
+