1 files changed, 34 insertions, 0 deletions

diff --git a/fs/squashfs/decompressor.c b/fs/squashfs/decompressor.c
index a5940e54c4dd..e921bd213738 100644
--- a/fs/squashfs/decompressor.c
+++ b/fs/squashfs/decompressor.c
@@ -23,6 +23,7 @@
 
 #include <linux/types.h>
 #include <linux/mutex.h>
+#include <linux/slab.h>
 #include <linux/buffer_head.h>
 
 #include "squashfs_fs.h"
@@ -74,3 +75,36 @@ const struct squashfs_decompressor *squashfs_lookup_decompressor(int id)
 
         return decompressor[i];
 }
+
+
+void *squashfs_decompressor_init(struct super_block *sb, unsigned short flags)
+{
+        struct squashfs_sb_info *msblk = sb->s_fs_info;
+        void *strm, *buffer = NULL;
+        int length = 0;
+
+        /*
+         * Read decompressor specific options from file system if present
+         */
+        if (SQUASHFS_COMP_OPTS(flags)) {
+                buffer = kmalloc(PAGE_CACHE_SIZE, GFP_KERNEL);
+                if (buffer == NULL)
+                        return ERR_PTR(-ENOMEM);
+
+                length = squashfs_read_data(sb, &buffer,
+                        sizeof(struct squashfs_super_block), 0, NULL,
+                        PAGE_CACHE_SIZE, 1);
+
+                if (length < 0) {
+                        strm = ERR_PTR(length);
+                        goto finished;
+                }
+        }
+
+        strm = msblk->decompressor->init(msblk, buffer, length);
+
+finished:
+        kfree(buffer);
+
+        return strm;
+}