1 files changed, 16 insertions, 0 deletions

diff --git a/fs/xfs/linux-2.6/xfs_file.c b/fs/xfs/linux-2.6/xfs_file.c
index cbcd40c8c2a0..b4c936485d11 100644
--- a/fs/xfs/linux-2.6/xfs_file.c
+++ b/fs/xfs/linux-2.6/xfs_file.c
@@ -413,6 +413,20 @@ xfs_file_open_exec(
 }
 #endif /* HAVE_FOP_OPEN_EXEC */
 
+/*
+ * mmap()d file has taken write protection fault and is being made
+ * writable. We can set the page state up correctly for a writable
+ * page, which means we can do correct delalloc accounting (ENOSPC
+ * checking!) and unwritten extent mapping.
+ */
+STATIC int
+xfs_vm_page_mkwrite(
+        struct vm_area_struct   *vma,
+        struct page             *page)
+{
+        return block_page_mkwrite(vma, page, xfs_get_blocks);
+}
+
 const struct file_operations xfs_file_operations = {
         .llseek         = generic_file_llseek,
         .read           = do_sync_read,
@@ -466,12 +480,14 @@ const struct file_operations xfs_dir_file_operations = {
 static struct vm_operations_struct xfs_file_vm_ops = {
         .nopage         = filemap_nopage,
         .populate       = filemap_populate,
+        .page_mkwrite   = xfs_vm_page_mkwrite,
 };
 
 #ifdef CONFIG_XFS_DMAPI
 static struct vm_operations_struct xfs_dmapi_file_vm_ops = {
         .nopage         = xfs_vm_nopage,
         .populate       = filemap_populate,
+        .page_mkwrite   = xfs_vm_page_mkwrite,
 #ifdef HAVE_VMOP_MPROTECT
         .mprotect       = xfs_vm_mprotect,
 #endif