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-rw-r--r--mm/filemap.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index a4a5260b0279..51efee65c2cc 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1712,8 +1712,27 @@ page_not_uptodate:
}
EXPORT_SYMBOL(filemap_fault);
+int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+ struct page *page = vmf->page;
+ struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
+ int ret = VM_FAULT_LOCKED;
+
+ file_update_time(vma->vm_file);
+ lock_page(page);
+ if (page->mapping != inode->i_mapping) {
+ unlock_page(page);
+ ret = VM_FAULT_NOPAGE;
+ goto out;
+ }
+out:
+ return ret;
+}
+EXPORT_SYMBOL(filemap_page_mkwrite);
+
const struct vm_operations_struct generic_file_vm_ops = {
.fault = filemap_fault,
+ .page_mkwrite = filemap_page_mkwrite,
};
/* This is used for a general mmap of a disk file */