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-rw-r--r--fs/aufs/dynop.h74
1 files changed, 74 insertions, 0 deletions
diff --git a/fs/aufs/dynop.h b/fs/aufs/dynop.h
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+++ b/fs/aufs/dynop.h
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+/*
+ * Copyright (C) 2010-2015 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, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * dynamically customizable operations (for regular files only)
+ */
+
+#ifndef __AUFS_DYNOP_H__
+#define __AUFS_DYNOP_H__
+
+#ifdef __KERNEL__
+
+#include <linux/fs.h>
+#include <linux/kref.h>
+
+enum {AuDy_AOP, AuDyLast};
+
+struct au_dynop {
+ int dy_type;
+ union {
+ const void *dy_hop;
+ const struct address_space_operations *dy_haop;
+ };
+};
+
+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 */
+};
+
+/* ---------------------------------------------------------------------- */
+
+/* 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);
+
+void __init au_dy_init(void);
+void au_dy_fin(void);
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_DYNOP_H__ */