Squashfs: Use vmalloc rather than kmalloc for zlib workspace

commit 117a91e0f25fd7698e20ac3dfa62086be3dc82a3 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/fs/squashfs/zlib_wrapper.c b/fs/squashfs/zlib_wrapper.c
index 4661ae2b1cec8040adcadc4018deb63735309f92..04ae9a5b70a66974b8df0fac31d1bb2139c95cdd 100644 (file)
--- 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)
        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);
 }