[PATCH 2 of 2] Make XFS use block_page_mkwrite

[David Chinner <dgc@xxxxxxx>]

Implement ->page_mkwrite in XFS.

Signed-Off-By: Dave Chinner <dgc@xxxxxxx>

---
 fs/xfs/linux-2.6/xfs_file.c |   16 ++++++++++++++++
 1 file changed, 16 insertions(+)

Index: 2.6.x-xfs-new/fs/xfs/linux-2.6/xfs_file.c
===================================================================
--- 2.6.x-xfs-new.orig/fs/xfs/linux-2.6/xfs_file.c      2007-02-07 
23:00:10.000000000 +1100
+++ 2.6.x-xfs-new/fs/xfs/linux-2.6/xfs_file.c   2007-02-07 23:15:20.170880823 
+1100
@@ -446,6 +446,20 @@ 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,
@@ -503,12 +517,14 @@ const struct file_operations xfs_dir_fil
 static struct vm_operations_struct xfs_file_vm_ops = {
        .nopage         = filemap_nopage,
        .populate       = filemap_populate,
+       .page_mkwrite   = xfs_vm_page_mkwrite,
 };
 
 #ifdef HAVE_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