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-rw-r--r--fs/btrfs/file.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index abcb91867b56..ce0cd29efa9e 100644
--- a/fs/btrfs/file.c
+++ b/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;
}