[PATCH] Squashfs: Use vmalloc rather than kmalloc for zlib workspace

[Phillip Lougher <phillip@lougher.demon.co.uk>]

Bugzilla bug 31422 reports occasional "page allocation failure. order:4"
at Squashfs mount time.  Fix this by making zlib workspace allocation
use vmalloc rather than kmalloc.

Reported-by: Mehmet Giritli <mehmet@giritli.eu>
Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
---
  fs/squashfs/zlib_wrapper.c |    6 +++---
  1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/squashfs/zlib_wrapper.c b/fs/squashfs/zlib_wrapper.c
index 195b0d0..517688b 100644
--- a/fs/squashfs/zlib_wrapper.c
+++ b/fs/squashfs/zlib_wrapper.c
@@ -26,6 +26,7 @@
  #include <linux/buffer_head.h>
  #include <linux/slab.h>
  #include <linux/zlib.h>
+#include <linux/vmalloc.h>

  #include "squashfs_fs.h"
  #include "squashfs_fs_sb.h"
@@ -37,8 +38,7 @@ static void *zlib_init(struct squashfs_sb_info *dummy, void *buff, int len)
  	z_stream *stream = kmalloc(sizeof(z_stream), GFP_KERNEL);
  	if (stream == NULL)
  		goto failed;
-	stream->workspace = kmalloc(zlib_inflate_workspacesize(),
-		GFP_KERNEL);
+	stream->workspace = vmalloc(zlib_inflate_workspacesize());
  	if (stream->workspace == NULL)
  		goto failed;

@@ -56,7 +56,7 @@ static void zlib_free(void *strm)
  	z_stream *stream = strm;

  	if (stream)
-		kfree(stream->workspace);
+		vfree(stream->workspace);
  	kfree(stream);
  }

-- 
1.7.1