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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2005-2019 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;
/* ---------------------------------------------------------------------- */
/* 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 */
#define AuOpt_DIRREN (1 << 15) /* directory rename */
#ifndef CONFIG_AUFS_HNOTIFY
#undef AuOpt_UDBA_HNOTIFY
#define AuOpt_UDBA_HNOTIFY 0
#endif
#ifndef CONFIG_AUFS_DIRREN
#undef AuOpt_DIRREN
#define AuOpt_DIRREN 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_TDMFS, /* top down regardless parent and mfs */
AuWbrCreate_TDMFSV, /* top down regardless parent and mfs */
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 AuOpts_REFRESH_IDOP (1 << 4)
#define AuOpts_DR_FLUSHED (1 << 5)
#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)
#ifndef CONFIG_AUFS_DIRREN
#undef AuOpts_DR_FLUSHED
#define AuOpts_DR_FLUSHED 0
#endif
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);
struct super_block;
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__ */
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