1 files changed, 30 insertions, 25 deletions

diff --git a/fs/squashfs/decompressor.c b/fs/squashfs/decompressor.c
index e9034bf6e5ae..7de35bf297aa 100644
--- a/fs/squashfs/decompressor.c
+++ b/fs/squashfs/decompressor.c
@@ -24,7 +24,8 @@
 #include <linux/types.h>
 #include <linux/mutex.h>
 #include <linux/slab.h>
-#include <linux/buffer_head.h>
+#include <linux/highmem.h>
+#include <linux/fs.h>
 
 #include "squashfs_fs.h"
 #include "squashfs_fs_sb.h"
@@ -94,40 +95,44 @@ const struct squashfs_decompressor *squashfs_lookup_decompressor(int id)
 static void *get_comp_opts(struct super_block *sb, unsigned short flags)
 {
 	struct squashfs_sb_info *msblk = sb->s_fs_info;
-	void *buffer = NULL, *comp_opts;
+	void *comp_opts, *buffer = NULL;
+	struct page *page;
 	struct squashfs_page_actor *actor = NULL;
 	int length = 0;
 
+	if (!SQUASHFS_COMP_OPTS(flags))
+		return squashfs_comp_opts(msblk, buffer, length);
+
 	/*
 	 * Read decompressor specific options from file system if present
 	 */
-	if (SQUASHFS_COMP_OPTS(flags)) {
-		buffer = kmalloc(PAGE_CACHE_SIZE, GFP_KERNEL);
-		if (buffer == NULL) {
-			comp_opts = ERR_PTR(-ENOMEM);
-			goto out;
-		}
-
-		actor = squashfs_page_actor_init(&buffer, 1, 0);
-		if (actor == NULL) {
-			comp_opts = ERR_PTR(-ENOMEM);
-			goto out;
-		}
-
-		length = squashfs_read_data(sb,
-			sizeof(struct squashfs_super_block), 0, NULL, actor);
-
-		if (length < 0) {
-			comp_opts = ERR_PTR(length);
-			goto out;
-		}
+
+	page = alloc_page(GFP_KERNEL);
+	if (!page)
+		return ERR_PTR(-ENOMEM);
+
+	actor = squashfs_page_actor_init(&page, 1, 0, NULL);
+	if (actor == NULL) {
+		comp_opts = ERR_PTR(-ENOMEM);
+		goto actor_error;
+	}
+
+	length = squashfs_read_data(sb,
+		sizeof(struct squashfs_super_block), 0, NULL, actor);
+
+	if (length < 0) {
+		comp_opts = ERR_PTR(length);
+		goto read_error;
 	}
 
+	buffer = kmap_atomic(page);
 	comp_opts = squashfs_comp_opts(msblk, buffer, length);
+	kunmap_atomic(buffer);
 
-out:
-	kfree(actor);
-	kfree(buffer);
+read_error:
+	squashfs_page_actor_free(actor, 0);
+actor_error:
+	__free_page(page);
 	return comp_opts;
 }