aufs: add files

[pandora-kernel.git] / fs / aufs / dynop.h

diff --git a/fs/aufs/dynop.h b/fs/aufs/dynop.h
new file mode 100644 (file)
index 0000000..d848aff
--- /dev/null
+++ b/fs/aufs/dynop.h
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2010-2011 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/*
+ * dynamically customizable operations (for regular files only)
+ */
+
+#ifndef __AUFS_DYNOP_H__
+#define __AUFS_DYNOP_H__
+
+#ifdef __KERNEL__
+
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/rcupdate.h>
+#include <linux/aufs_type.h>
+#include "inode.h"
+
+enum {AuDy_AOP, AuDy_VMOP, AuDyLast};
+
+struct au_dynop {
+       int                                             dy_type;
+       union {
+               const void                              *dy_hop;
+               const struct address_space_operations   *dy_haop;
+               const struct vm_operations_struct       *dy_hvmop;
+       };
+};
+
+struct au_dykey {
+       union {
+               struct list_head        dk_list;
+               struct rcu_head         dk_rcu;
+       };
+       struct au_dynop         dk_op;
+
+       /*
+        * during I am in the branch local array, kref is gotten. when the
+        * branch is removed, kref is put.
+        */
+       struct kref             dk_kref;
+};
+
+/* stop unioning since their sizes are very different from each other */
+struct au_dyaop {
+       struct au_dykey                 da_key;
+       struct address_space_operations da_op; /* not const */
+       int (*da_get_xip_mem)(struct address_space *, pgoff_t, int,
+                             void **, unsigned long *);
+};
+
+struct au_dyvmop {
+       struct au_dykey                 dv_key;
+       struct vm_operations_struct     dv_op; /* not const */
+};
+
+/* ---------------------------------------------------------------------- */
+
+/* dynop.c */
+struct au_branch;
+void au_dy_put(struct au_dykey *key);
+int au_dy_iaop(struct inode *inode, aufs_bindex_t bindex,
+               struct inode *h_inode);
+int au_dy_irefresh(struct inode *inode);
+void au_dy_arefresh(int do_dio);
+const struct vm_operations_struct *
+au_dy_vmop(struct file *file, struct au_branch *br,
+          const struct vm_operations_struct *h_vmop);
+
+void __init au_dy_init(void);
+void au_dy_fin(void);
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_DYNOP_H__ */