Initial import

1 files changed, 210 insertions, 0 deletions

diff --git a/fs/aufs/opts.h b/fs/aufs/opts.h
new file mode 100644
index 000000000..b18a4aa00
--- /dev/null
+++ b/fs/aufs/opts.h
@@ -0,0 +1,210 @@
+/*
+ * Copyright (C) 2005-2015 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/>.
+ */
+
+/*
+ * mount options/flags
+ */
+
+#ifndef __AUFS_OPTS_H__
+#define __AUFS_OPTS_H__
+
+#ifdef __KERNEL__
+
+#include <linux/path.h>
+
+struct file;
+struct super_block;
+
+/* ---------------------------------------------------------------------- */
+
+/* mount flags */
+#define AuOpt_XINO		1		/* external inode number bitmap
+						   and translation table */
+#define AuOpt_TRUNC_XINO	(1 << 1)	/* truncate xino files */
+#define AuOpt_UDBA_NONE		(1 << 2)	/* users direct branch access */
+#define AuOpt_UDBA_REVAL	(1 << 3)
+#define AuOpt_UDBA_HNOTIFY	(1 << 4)
+#define AuOpt_SHWH		(1 << 5)	/* show whiteout */
+#define AuOpt_PLINK		(1 << 6)	/* pseudo-link */
+#define AuOpt_DIRPERM1		(1 << 7)	/* ignore the lower dir's perm
+						   bits */
+#define AuOpt_ALWAYS_DIROPQ	(1 << 9)	/* policy to creating diropq */
+#define AuOpt_SUM		(1 << 10)	/* summation for statfs(2) */
+#define AuOpt_SUM_W		(1 << 11)	/* unimplemented */
+#define AuOpt_WARN_PERM		(1 << 12)	/* warn when add-branch */
+#define AuOpt_VERBOSE		(1 << 13)	/* busy inode when del-branch */
+#define AuOpt_DIO		(1 << 14)	/* direct io */
+
+#ifndef CONFIG_AUFS_HNOTIFY
+#undef AuOpt_UDBA_HNOTIFY
+#define AuOpt_UDBA_HNOTIFY	0
+#endif
+#ifndef CONFIG_AUFS_SHWH
+#undef AuOpt_SHWH
+#define AuOpt_SHWH		0
+#endif
+
+#define AuOpt_Def	(AuOpt_XINO \
+			 | AuOpt_UDBA_REVAL \
+			 | AuOpt_PLINK \
+			 /* | AuOpt_DIRPERM1 */ \
+			 | AuOpt_WARN_PERM)
+#define AuOptMask_UDBA	(AuOpt_UDBA_NONE \
+			 | AuOpt_UDBA_REVAL \
+			 | AuOpt_UDBA_HNOTIFY)
+
+#define au_opt_test(flags, name)	(flags & AuOpt_##name)
+#define au_opt_set(flags, name) do { \
+	BUILD_BUG_ON(AuOpt_##name & AuOptMask_UDBA); \
+	((flags) |= AuOpt_##name); \
+} while (0)
+#define au_opt_set_udba(flags, name) do { \
+	(flags) &= ~AuOptMask_UDBA; \
+	((flags) |= AuOpt_##name); \
+} while (0)
+#define au_opt_clr(flags, name) do { \
+	((flags) &= ~AuOpt_##name); \
+} while (0)
+
+static inline unsigned int au_opts_plink(unsigned int mntflags)
+{
+#ifdef CONFIG_PROC_FS
+	return mntflags;
+#else
+	return mntflags & ~AuOpt_PLINK;
+#endif
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* policies to select one among multiple writable branches */
+enum {
+	AuWbrCreate_TDP,	/* top down parent */
+	AuWbrCreate_RR,		/* round robin */
+	AuWbrCreate_MFS,	/* most free space */
+	AuWbrCreate_MFSV,	/* mfs with seconds */
+	AuWbrCreate_MFSRR,	/* mfs then rr */
+	AuWbrCreate_MFSRRV,	/* mfs then rr with seconds */
+	AuWbrCreate_PMFS,	/* parent and mfs */
+	AuWbrCreate_PMFSV,	/* parent and mfs with seconds */
+	AuWbrCreate_PMFSRR,	/* parent, mfs and round-robin */
+	AuWbrCreate_PMFSRRV,	/* plus seconds */
+
+	AuWbrCreate_Def = AuWbrCreate_TDP
+};
+
+enum {
+	AuWbrCopyup_TDP,	/* top down parent */
+	AuWbrCopyup_BUP,	/* bottom up parent */
+	AuWbrCopyup_BU,		/* bottom up */
+
+	AuWbrCopyup_Def = AuWbrCopyup_TDP
+};
+
+/* ---------------------------------------------------------------------- */
+
+struct au_opt_add {
+	aufs_bindex_t	bindex;
+	char		*pathname;
+	int		perm;
+	struct path	path;
+};
+
+struct au_opt_del {
+	char		*pathname;
+	struct path	h_path;
+};
+
+struct au_opt_mod {
+	char		*path;
+	int		perm;
+	struct dentry	*h_root;
+};
+
+struct au_opt_xino {
+	char		*path;
+	struct file	*file;
+};
+
+struct au_opt_xino_itrunc {
+	aufs_bindex_t	bindex;
+};
+
+struct au_opt_wbr_create {
+	int			wbr_create;
+	int			mfs_second;
+	unsigned long long	mfsrr_watermark;
+};
+
+struct au_opt {
+	int type;
+	union {
+		struct au_opt_xino	xino;
+		struct au_opt_xino_itrunc xino_itrunc;
+		struct au_opt_add	add;
+		struct au_opt_del	del;
+		struct au_opt_mod	mod;
+		int			dirwh;
+		int			rdcache;
+		unsigned int		rdblk;
+		unsigned int		rdhash;
+		int			udba;
+		struct au_opt_wbr_create wbr_create;
+		int			wbr_copyup;
+		unsigned int		fhsm_second;
+	};
+};
+
+/* opts flags */
+#define AuOpts_REMOUNT		1
+#define AuOpts_REFRESH		(1 << 1)
+#define AuOpts_TRUNC_XIB	(1 << 2)
+#define AuOpts_REFRESH_DYAOP	(1 << 3)
+#define au_ftest_opts(flags, name)	((flags) & AuOpts_##name)
+#define au_fset_opts(flags, name) \
+	do { (flags) |= AuOpts_##name; } while (0)
+#define au_fclr_opts(flags, name) \
+	do { (flags) &= ~AuOpts_##name; } while (0)
+
+struct au_opts {
+	struct au_opt	*opt;
+	int		max_opt;
+
+	unsigned int	given_udba;
+	unsigned int	flags;
+	unsigned long	sb_flags;
+};
+
+/* ---------------------------------------------------------------------- */
+
+/* opts.c */
+void au_optstr_br_perm(au_br_perm_str_t *str, int perm);
+const char *au_optstr_udba(int udba);
+const char *au_optstr_wbr_copyup(int wbr_copyup);
+const char *au_optstr_wbr_create(int wbr_create);
+
+void au_opts_free(struct au_opts *opts);
+int au_opts_parse(struct super_block *sb, char *str, struct au_opts *opts);
+int au_opts_verify(struct super_block *sb, unsigned long sb_flags,
+		   unsigned int pending);
+int au_opts_mount(struct super_block *sb, struct au_opts *opts);
+int au_opts_remount(struct super_block *sb, struct au_opts *opts);
+
+unsigned int au_opt_udba(struct super_block *sb);
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_OPTS_H__ */