+/*
+ * mark an inode as under writeback on the sb
+ */
+void sb_mark_inode_writeback(struct inode *inode)
+{
+ struct super_block *sb = inode->i_sb;
+ unsigned long flags;
+
+ if (list_empty(&inode->i_wb_list)) {
+ spin_lock_irqsave(&sb->s_inode_wblist_lock, flags);
+ if (list_empty(&inode->i_wb_list)) {
+ list_add_tail(&inode->i_wb_list, &sb->s_inodes_wb);
+ trace_sb_mark_inode_writeback(inode);
+ }
+ spin_unlock_irqrestore(&sb->s_inode_wblist_lock, flags);
+ }
+}
+
+/*
+ * clear an inode as under writeback on the sb
+ */
+void sb_clear_inode_writeback(struct inode *inode)
+{
+ struct super_block *sb = inode->i_sb;
+ unsigned long flags;
+
+ if (!list_empty(&inode->i_wb_list)) {
+ spin_lock_irqsave(&sb->s_inode_wblist_lock, flags);
+ if (!list_empty(&inode->i_wb_list)) {
+ list_del_init(&inode->i_wb_list);
+ trace_sb_clear_inode_writeback(inode);
+ }
+ spin_unlock_irqrestore(&sb->s_inode_wblist_lock, flags);
+ }
+}
+