Merge branch 'rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip...

[linux-2.6-omap-h63xx.git] / fs / afs / write.c

diff --git a/fs/afs/write.c b/fs/afs/write.c
index 3fb36d433621dd2bb71edcc757dbe22390ff2640..c2e7a7ff008054ad63fb8ae33677b96b359bd90f 100644 (file)
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -780,3 +780,24 @@ int afs_fsync(struct file *file, struct dentry *dentry, int datasync)
        _leave(" = %d", ret);
        return ret;
 }
+
+/*
+ * notification that a previously read-only page is about to become writable
+ * - if it returns an error, the caller will deliver a bus error signal
+ */
+int afs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
+{
+       struct afs_vnode *vnode = AFS_FS_I(vma->vm_file->f_mapping->host);
+
+       _enter("{{%x:%u}},{%lx}",
+              vnode->fid.vid, vnode->fid.vnode, page->index);
+
+       /* wait for the page to be written to the cache before we allow it to
+        * be modified */
+#ifdef CONFIG_AFS_FSCACHE
+       fscache_wait_on_page_write(vnode->cache, page);
+#endif
+
+       _leave(" = 0");
+       return 0;
+}