--- /dev/null
+++ b/ldiskfs/kernel_patches/patches/rhel6.3/ext4-notalloc_under_idatasem.patch
@@ -0,0 +1,14 @@
+Index: linux-stage/fs/ext4/extents.c
+===================================================================
+--- linux-stage.orig/fs/ext4/extents.c	2015-07-13 22:22:56.000000000 +0300
++++ linux-stage/fs/ext4/extents.c	2015-07-13 22:24:05.000000000 +0300
+@@ -4318,7 +4318,8 @@ static int ext4_find_delayed_extent(stru
+ 	struct buffer_head *head = NULL;
+ 	unsigned int nr_pages = PAGE_SIZE / sizeof(struct page *);
+ 
+-	pages = kmalloc(PAGE_SIZE, GFP_KERNEL);
++	/* we are running under i_data_sem so don't re-enter fs code */
++	pages = kmalloc(PAGE_SIZE, GFP_NOFS);
+ 	if (pages == NULL)
+ 		return -ENOMEM;
+