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/*
* 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 members */
__u16 v_size; /* size of members */
__u16 v_flags;
__u64 v_index;
};
/**
* struct nilfs_period - period of checkpoint numbers
* @p_start: start checkpoint number (inclusive)
* @p_end: end checkpoint number (exclusive)
*/
struct nilfs_period {
__u64 p_start;
__u64 p_end;
};
/**
* struct nilfs_cpstat - checkpoint statistics
* @cs_cno: checkpoint number
* @cs_ncps: number of checkpoints
* @cs_nsss: number of snapshots
*/
struct nilfs_cpstat {
__u64 cs_cno;
__u64 cs_ncps;
__u64 cs_nsss;
};
/**
* struct nilfs_sustat - segment usage statistics
* @ss_nsegs: number of segments
* @ss_ncleansegs: number of clean segments
* @ss_ndirtysegs: number of dirty segments
* @ss_ctime: creation time of the last segment
* @ss_nongc_ctime: creation time of the last segment not for GC
* @ss_prot_seq: least sequence number of segments which must not be reclaimed
*/
struct nilfs_sustat {
__u64 ss_nsegs;
__u64 ss_ncleansegs;
__u64 ss_ndirtysegs;
__u64 ss_ctime;
__u64 ss_nongc_ctime;
__u64 ss_prot_seq;
};
/**
* struct nilfs_vinfo - virtual block number information
* @vi_vblocknr: virtual block number
* @vi_start: start checkpoint number (inclusive)
* @vi_end: end checkpoint number (exclusive)
* @vi_blocknr: disk block number
*/
struct nilfs_vinfo {
__u64 vi_vblocknr;
__u64 vi_start;
__u64 vi_end;
__u64 vi_blocknr;
};
/**
* struct nilfs_vdesc - descriptor of virtual block number
* @vd_ino: inode number
* @vd_cno: checkpoint number
* @vd_vblocknr: virtual block number
* @vd_period: period of checkpoint numbers
* @vd_blocknr: disk block number
* @vd_offset: logical block offset inside a file
* @vd_flags: flags (data or node block)
* @vd_pad: padding
*/
struct nilfs_vdesc {
__u64 vd_ino;
__u64 vd_cno;
__u64 vd_vblocknr;
struct nilfs_period vd_period;
__u64 vd_blocknr;
__u64 vd_offset;
__u32 vd_flags;
__u32 vd_pad;
};
/**
* struct nilfs_bdesc - descriptor of disk block number
* @bd_ino: inode number
* @bd_oblocknr: disk block address (for skipping dead blocks)
* @bd_blocknr: disk block address
* @bd_offset: logical block offset inside a file
* @bd_level: level in the b-tree organization
* @bd_pad: padding
*/
struct nilfs_bdesc {
__u64 bd_ino;
__u64 bd_oblocknr;
__u64 bd_blocknr;
__u64 bd_offset;
__u32 bd_level;
__u32 bd_pad;
};
#define NILFS_IOCTL_IDENT 'n'
#define NILFS_IOCTL_CHANGE_CPMODE \
_IOW(NILFS_IOCTL_IDENT, 0x80, struct nilfs_cpmode)
#define NILFS_IOCTL_DELETE_CHECKPOINT \
_IOW(NILFS_IOCTL_IDENT, 0x81, __u64)
#define NILFS_IOCTL_GET_CPINFO \
_IOR(NILFS_IOCTL_IDENT, 0x82, struct nilfs_argv)
#define NILFS_IOCTL_GET_CPSTAT \
_IOR(NILFS_IOCTL_IDENT, 0x83, struct nilfs_cpstat)
#define NILFS_IOCTL_GET_SUINFO \
_IOR(NILFS_IOCTL_IDENT, 0x84, struct nilfs_argv)
#define NILFS_IOCTL_GET_SUSTAT \
_IOR(NILFS_IOCTL_IDENT, 0x85, struct nilfs_sustat)
#define NILFS_IOCTL_GET_VINFO \
_IOWR(NILFS_IOCTL_IDENT, 0x86, struct nilfs_argv)
#define NILFS_IOCTL_GET_BDESCS \
_IOWR(NILFS_IOCTL_IDENT, 0x87, struct nilfs_argv)
#define NILFS_IOCTL_CLEAN_SEGMENTS \
_IOW(NILFS_IOCTL_IDENT, 0x88, struct nilfs_argv[5])
#define NILFS_IOCTL_SYNC \
_IOR(NILFS_IOCTL_IDENT, 0x8A, __u64)
#define NILFS_IOCTL_RESIZE \
_IOW(NILFS_IOCTL_IDENT, 0x8B, __u64)
#define NILFS_IOCTL_SET_ALLOC_RANGE \
_IOW(NILFS_IOCTL_IDENT, 0x8C, __u64[2])
#define NILFS_IOCTL_SET_SUINFO \
_IOW(NILFS_IOCTL_IDENT, 0x8D, struct nilfs_argv)
#endif /* _LINUX_NILFS2_API_H */
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