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     €ДГѓu·ВїЕ Ќ    /* SPDX-License-Identifier: LGPL-2.1+ WITH Linux-syscall-note */
/*
 * nilfs2_api.h - NILFS2 user space API
 *
 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 */

#ifndef _LINUX_NILFS2_API_H
#define _LINUX_NILFS2_API_H

#include <linux/types.h>
#include <linux/ioctl.h>

/**
 * struct nilfs_cpinfo - checkpoint information
 * @ci_flags: flags
 * @ci_pad: padding
 * @ci_cno: checkpoint number
 * @ci_create: creation timestamp
 * @ci_nblk_inc: number of blocks incremented by this checkpoint
 * @ci_inodes_count: inodes count
 * @ci_blocks_count: blocks count
 * @ci_next: next checkpoint number in snapshot list
 */
struct nilfs_cpinfo {
	__u32 ci_flags;
	__u32 ci_pad;
	__u64 ci_cno;
	__u64 ci_create;
	__u64 ci_nblk_inc;
	__u64 ci_inodes_count;
	__u64 ci_blocks_count;
	__u64 ci_next;
};

/* checkpoint flags */
enum {
	NILFS_CPINFO_SNAPSHOT,
	NILFS_CPINFO_INVALID,
	NILFS_CPINFO_SKETCH,
	NILFS_CPINFO_MINOR,
};

#define NILFS_CPINFO_FNS(flag, name)					\
static inline int							\
nilfs_cpinfo_##name(const struct nilfs_cpinfo *cpinfo)			\
{									\
	return !!(cpinfo->ci_flags & (1UL << NILFS_CPINFO_##flag));	\
}

NILFS_CPINFO_FNS(SNAPSHOT, snapshot)
NILFS_CPINFO_FNS(INVALID, invalid)
NILFS_CPINFO_FNS(MINOR, minor)

/**
 * nilfs_suinfo - segment usage information
 * @sui_lastmod: timestamp of last modification
 * @sui_nblocks: number of written blocks in segment
 * @sui_flags: segment usage flags
 */
struct nilfs_suinfo {
	__u64 sui_lastmod;
	__u32 sui_nblocks;
	__u32 sui_flags;
};

/* segment usage flags */
enum {
	NILFS_SUINFO_ACTIVE,
	NILFS_SUINFO_DIRTY,
	NILFS_SUINFO_ERROR,
};

#define NILFS_SUINFO_FNS(flag, name)					\
static inline int							\
nilfs_suinfo_##name(const struct nilfs_suinfo *si)			\
{									\
	return si->sui_flags & (1UL << NILFS_SUINFO_##flag);		\
}

NILFS_SUINFO_FNS(ACTIVE, active)
NILFS_SUINFO_FNS(DIRTY, dirty)
NILFS_SUINFO_FNS(ERROR, error)

static inline int nilfs_suinfo_clean(const struct nilfs_suinfo *si)
{
	return !si->sui_flags;
}

/**
 * nilfs_suinfo_update - segment usage information update
 * @sup_segnum: segment number
 * @sup_flags: flags for which fields are active in sup_sui
 * @sup_reserved: reserved necessary for alignment
 * @sup_sui: segment usage information
 */
struct nilfs_suinfo_update {
	__u64 sup_segnum;
	__u32 sup_flags;
	__u32 sup_reserved;
	struct nilfs_suinfo sup_sui;
};

enum {
	NILFS_SUINFO_UPDATE_LASTMOD,
	NILFS_SUINFO_UPDATE_NBLOCKS,
	NILFS_SUINFO_UPDATE_FLAGS,
	__NR_NILFS_SUINFO_UPDATE_FIELDS,
};

#define NILFS_SUINFO_UPDATE_FNS(flag, name)				\
static inline void							\
nilfs_suinfo_update_set_##name(struct nilfs_suinfo_update *sup)		\
{									\
	sup->sup_flags |= 1UL << NILFS_SUINFO_UPDATE_##flag;		\
}									\
static inline void							\
nilfs_suinfo_update_clear_##name(struct nilfs_suinfo_update *sup)	\
{									\
	sup->sup_flags &= ~(1UL << NILFS_SUINFO_UPDATE_##flag);		\
}									\
static inline int							\
nilfs_suinfo_update_##name(const struct nilfs_suinfo_update *sup)	\
{									\
	return !!(sup->sup_flags & (1UL << NILFS_SUINFO_UPDATE_##flag));\
}

NILFS_SUINFO_UPDATE_FNS(LASTMOD, lastmod)
NILFS_SUINFO_UPDATE_FNS(NBLOCKS, nblocks)
NILFS_SUINFO_UPDATE_FNS(FLAGS, flags)

enum {
	NILFS_CHECKPOINT,
	NILFS_SNAPSHOT,
};

/**
 * struct nilfs_cpmode - change checkpoint mode structure
 * @cm_cno: checkpoint number
 * @cm_mode: mode of checkpoint
 * @cm_pad: padding
 */
struct nilfs_cpmode {
	__u64 cm_cno;
	__u32 cm_mode;
	__u32 cm_pad;
};

/**
 * struct nilfs_argv - argument vector
 * @v_base: pointer on data array from userspace
 * @v_nmembs: number of members in data array
 * @v_size: size of data array in bytes
 * @v_flags: flags
 * @v_index: start number of target data items
 */
struct nilfs_argv {
	__u64 v_base;
	__u32 v_nmembs;	/* number of membe