293 lines
7.3 KiB
C
293 lines
7.3 KiB
C
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/*
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* nilfs2_api.h - NILFS2 user space API
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*
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* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*/
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#ifndef _LINUX_NILFS2_API_H
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#define _LINUX_NILFS2_API_H
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#include <linux/types.h>
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#include <linux/ioctl.h>
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/**
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* struct nilfs_cpinfo - checkpoint information
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* @ci_flags: flags
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* @ci_pad: padding
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* @ci_cno: checkpoint number
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* @ci_create: creation timestamp
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* @ci_nblk_inc: number of blocks incremented by this checkpoint
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* @ci_inodes_count: inodes count
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* @ci_blocks_count: blocks count
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* @ci_next: next checkpoint number in snapshot list
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*/
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struct nilfs_cpinfo {
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__u32 ci_flags;
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__u32 ci_pad;
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__u64 ci_cno;
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__u64 ci_create;
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__u64 ci_nblk_inc;
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__u64 ci_inodes_count;
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__u64 ci_blocks_count;
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__u64 ci_next;
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};
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/* checkpoint flags */
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enum {
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NILFS_CPINFO_SNAPSHOT,
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NILFS_CPINFO_INVALID,
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NILFS_CPINFO_SKETCH,
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NILFS_CPINFO_MINOR,
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};
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#define NILFS_CPINFO_FNS(flag, name) \
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static inline int \
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nilfs_cpinfo_##name(const struct nilfs_cpinfo *cpinfo) \
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{ \
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return !!(cpinfo->ci_flags & (1UL << NILFS_CPINFO_##flag)); \
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}
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NILFS_CPINFO_FNS(SNAPSHOT, snapshot)
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NILFS_CPINFO_FNS(INVALID, invalid)
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NILFS_CPINFO_FNS(MINOR, minor)
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/**
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* nilfs_suinfo - segment usage information
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* @sui_lastmod: timestamp of last modification
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* @sui_nblocks: number of written blocks in segment
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* @sui_flags: segment usage flags
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*/
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struct nilfs_suinfo {
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__u64 sui_lastmod;
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__u32 sui_nblocks;
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__u32 sui_flags;
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};
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/* segment usage flags */
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enum {
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NILFS_SUINFO_ACTIVE,
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NILFS_SUINFO_DIRTY,
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NILFS_SUINFO_ERROR,
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};
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#define NILFS_SUINFO_FNS(flag, name) \
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static inline int \
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nilfs_suinfo_##name(const struct nilfs_suinfo *si) \
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{ \
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return si->sui_flags & (1UL << NILFS_SUINFO_##flag); \
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}
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NILFS_SUINFO_FNS(ACTIVE, active)
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NILFS_SUINFO_FNS(DIRTY, dirty)
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NILFS_SUINFO_FNS(ERROR, error)
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static inline int nilfs_suinfo_clean(const struct nilfs_suinfo *si)
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{
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return !si->sui_flags;
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}
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/**
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* nilfs_suinfo_update - segment usage information update
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* @sup_segnum: segment number
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* @sup_flags: flags for which fields are active in sup_sui
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* @sup_reserved: reserved necessary for alignment
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* @sup_sui: segment usage information
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*/
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struct nilfs_suinfo_update {
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__u64 sup_segnum;
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__u32 sup_flags;
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__u32 sup_reserved;
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struct nilfs_suinfo sup_sui;
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};
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enum {
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NILFS_SUINFO_UPDATE_LASTMOD,
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NILFS_SUINFO_UPDATE_NBLOCKS,
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NILFS_SUINFO_UPDATE_FLAGS,
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__NR_NILFS_SUINFO_UPDATE_FIELDS,
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};
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#define NILFS_SUINFO_UPDATE_FNS(flag, name) \
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static inline void \
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nilfs_suinfo_update_set_##name(struct nilfs_suinfo_update *sup) \
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{ \
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sup->sup_flags |= 1UL << NILFS_SUINFO_UPDATE_##flag; \
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} \
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static inline void \
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nilfs_suinfo_update_clear_##name(struct nilfs_suinfo_update *sup) \
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{ \
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sup->sup_flags &= ~(1UL << NILFS_SUINFO_UPDATE_##flag); \
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} \
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static inline int \
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nilfs_suinfo_update_##name(const struct nilfs_suinfo_update *sup) \
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{ \
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return !!(sup->sup_flags & (1UL << NILFS_SUINFO_UPDATE_##flag));\
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}
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NILFS_SUINFO_UPDATE_FNS(LASTMOD, lastmod)
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NILFS_SUINFO_UPDATE_FNS(NBLOCKS, nblocks)
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NILFS_SUINFO_UPDATE_FNS(FLAGS, flags)
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enum {
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NILFS_CHECKPOINT,
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NILFS_SNAPSHOT,
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};
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/**
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* struct nilfs_cpmode - change checkpoint mode structure
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* @cm_cno: checkpoint number
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* @cm_mode: mode of checkpoint
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* @cm_pad: padding
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*/
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struct nilfs_cpmode {
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__u64 cm_cno;
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__u32 cm_mode;
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__u32 cm_pad;
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};
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/**
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* struct nilfs_argv - argument vector
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* @v_base: pointer on data array from userspace
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* @v_nmembs: number of members in data array
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* @v_size: size of data array in bytes
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* @v_flags: flags
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* @v_index: start number of target data items
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*/
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struct nilfs_argv {
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__u64 v_base;
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__u32 v_nmembs; /* number of members */
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__u16 v_size; /* size of members */
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__u16 v_flags;
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__u64 v_index;
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};
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/**
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* struct nilfs_period - period of checkpoint numbers
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* @p_start: start checkpoint number (inclusive)
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* @p_end: end checkpoint number (exclusive)
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*/
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struct nilfs_period {
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__u64 p_start;
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__u64 p_end;
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};
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/**
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* struct nilfs_cpstat - checkpoint statistics
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* @cs_cno: checkpoint number
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* @cs_ncps: number of checkpoints
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* @cs_nsss: number of snapshots
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*/
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struct nilfs_cpstat {
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__u64 cs_cno;
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__u64 cs_ncps;
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__u64 cs_nsss;
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};
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/**
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* struct nilfs_sustat - segment usage statistics
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* @ss_nsegs: number of segments
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* @ss_ncleansegs: number of clean segments
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* @ss_ndirtysegs: number of dirty segments
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* @ss_ctime: creation time of the last segment
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* @ss_nongc_ctime: creation time of the last segment not for GC
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* @ss_prot_seq: least sequence number of segments which must not be reclaimed
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*/
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struct nilfs_sustat {
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__u64 ss_nsegs;
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__u64 ss_ncleansegs;
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__u64 ss_ndirtysegs;
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__u64 ss_ctime;
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__u64 ss_nongc_ctime;
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__u64 ss_prot_seq;
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};
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/**
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* struct nilfs_vinfo - virtual block number information
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* @vi_vblocknr: virtual block number
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* @vi_start: start checkpoint number (inclusive)
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* @vi_end: end checkpoint number (exclusive)
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* @vi_blocknr: disk block number
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*/
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struct nilfs_vinfo {
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__u64 vi_vblocknr;
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__u64 vi_start;
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__u64 vi_end;
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__u64 vi_blocknr;
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};
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/**
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* struct nilfs_vdesc - descriptor of virtual block number
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* @vd_ino: inode number
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* @vd_cno: checkpoint number
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* @vd_vblocknr: virtual block number
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* @vd_period: period of checkpoint numbers
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* @vd_blocknr: disk block number
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* @vd_offset: logical block offset inside a file
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* @vd_flags: flags (data or node block)
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* @vd_pad: padding
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*/
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struct nilfs_vdesc {
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__u64 vd_ino;
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__u64 vd_cno;
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__u64 vd_vblocknr;
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struct nilfs_period vd_period;
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__u64 vd_blocknr;
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__u64 vd_offset;
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__u32 vd_flags;
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__u32 vd_pad;
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};
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/**
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* struct nilfs_bdesc - descriptor of disk block number
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* @bd_ino: inode number
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* @bd_oblocknr: disk block address (for skipping dead blocks)
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* @bd_blocknr: disk block address
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* @bd_offset: logical block offset inside a file
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* @bd_level: level in the b-tree organization
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* @bd_pad: padding
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*/
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struct nilfs_bdesc {
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__u64 bd_ino;
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__u64 bd_oblocknr;
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__u64 bd_blocknr;
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__u64 bd_offset;
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__u32 bd_level;
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__u32 bd_pad;
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};
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#define NILFS_IOCTL_IDENT 'n'
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#define NILFS_IOCTL_CHANGE_CPMODE \
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_IOW(NILFS_IOCTL_IDENT, 0x80, struct nilfs_cpmode)
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#define NILFS_IOCTL_DELETE_CHECKPOINT \
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_IOW(NILFS_IOCTL_IDENT, 0x81, __u64)
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#define NILFS_IOCTL_GET_CPINFO \
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_IOR(NILFS_IOCTL_IDENT, 0x82, struct nilfs_argv)
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#define NILFS_IOCTL_GET_CPSTAT \
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_IOR(NILFS_IOCTL_IDENT, 0x83, struct nilfs_cpstat)
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#define NILFS_IOCTL_GET_SUINFO \
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_IOR(NILFS_IOCTL_IDENT, 0x84, struct nilfs_argv)
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#define NILFS_IOCTL_GET_SUSTAT \
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_IOR(NILFS_IOCTL_IDENT, 0x85, struct nilfs_sustat)
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#define NILFS_IOCTL_GET_VINFO \
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_IOWR(NILFS_IOCTL_IDENT, 0x86, struct nilfs_argv)
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#define NILFS_IOCTL_GET_BDESCS \
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_IOWR(NILFS_IOCTL_IDENT, 0x87, struct nilfs_argv)
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#define NILFS_IOCTL_CLEAN_SEGMENTS \
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_IOW(NILFS_IOCTL_IDENT, 0x88, struct nilfs_argv[5])
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#define NILFS_IOCTL_SYNC \
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_IOR(NILFS_IOCTL_IDENT, 0x8A, __u64)
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#define NILFS_IOCTL_RESIZE \
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_IOW(NILFS_IOCTL_IDENT, 0x8B, __u64)
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#define NILFS_IOCTL_SET_ALLOC_RANGE \
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_IOW(NILFS_IOCTL_IDENT, 0x8C, __u64[2])
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#define NILFS_IOCTL_SET_SUINFO \
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_IOW(NILFS_IOCTL_IDENT, 0x8D, struct nilfs_argv)
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#endif /* _LINUX_NILFS2_API_H */
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