Merge branch 'akpm-current/current'

[karo-tx-linux.git] / fs / dax.c

diff --git a/fs/dax.c b/fs/dax.c
index a27846946525ed48b87071743f21ae744dacac36..0bb0aecb556cd15be7c902b3b315345a1017588f 100644 (file)
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -462,6 +462,23 @@ int dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf,
 }
 EXPORT_SYMBOL_GPL(dax_fault);
 
+/**
+ * dax_pfn_mkwrite - handle first write to DAX page
+ * @vma: The virtual memory area where the fault occurred
+ * @vmf: The description of the fault
+ *
+ */
+int dax_pfn_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+       struct super_block *sb = file_inode(vma->vm_file)->i_sb;
+
+       sb_start_pagefault(sb);
+       file_update_time(vma->vm_file);
+       sb_end_pagefault(sb);
+       return VM_FAULT_NOPAGE;
+}
+EXPORT_SYMBOL_GPL(dax_pfn_mkwrite);
+
 /**
  * dax_zero_page_range - zero a range within a page of a DAX file
  * @inode: The file being truncated