From 609f19e62675154ba7ac3079f31b855a484f1e01 Mon Sep 17 00:00:00 2001
From: Miao Xie <miaox@cn.fujitsu.com>
Date: Thu, 20 May 2010 07:21:50 +0000
Subject: [PATCH] --- yaml --- r: 200353 b: refs/heads/master c:
 058a457ef0ce28d595af53d6103db73332383cbc h: refs/heads/master i:   200351:
 d20f7437099073129594e122a3791e2206165430 v: v3

---
 [refs]                | 2 +-
 trunk/fs/btrfs/file.c | 9 ++++++++-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/[refs] b/[refs]
index 5b6185f3bf9a..6234f2ec9bea 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 0e4dcbef1c0c3e29f9c7f824359445d385b2649a
+refs/heads/master: 058a457ef0ce28d595af53d6103db73332383cbc
diff --git a/trunk/fs/btrfs/file.c b/trunk/fs/btrfs/file.c
index abcb91867b56..ce0cd29efa9e 100644
--- a/trunk/fs/btrfs/file.c
+++ b/trunk/fs/btrfs/file.c
@@ -1189,8 +1189,15 @@ static const struct vm_operations_struct btrfs_file_vm_ops = {
 
 static int btrfs_file_mmap(struct file	*filp, struct vm_area_struct *vma)
 {
-	vma->vm_ops = &btrfs_file_vm_ops;
+	struct address_space *mapping = filp->f_mapping;
+
+	if (!mapping->a_ops->readpage)
+		return -ENOEXEC;
+
 	file_accessed(filp);
+	vma->vm_ops = &btrfs_file_vm_ops;
+	vma->vm_flags |= VM_CAN_NONLINEAR;
+
 	return 0;
 }