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    Subject[PATCH 02/27] nilfs2: disk format and userland interface
    Date
    From: Koji Sato <sato.koji@lab.ntt.co.jp>

    This adds a header file which specifies the on-disk format and ioctl
    interface of the nilfs2 file system.

    Signed-off-by: Koji Sato <sato.koji@lab.ntt.co.jp>
    Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
    ---
    include/linux/nilfs2_fs.h | 854 +++++++++++++++++++++++++++++++++++++++++++++
    1 files changed, 854 insertions(+), 0 deletions(-)
    create mode 100644 include/linux/nilfs2_fs.h

    diff --git a/include/linux/nilfs2_fs.h b/include/linux/nilfs2_fs.h
    new file mode 100644
    index 0000000..e38fad2
    --- /dev/null
    +++ b/include/linux/nilfs2_fs.h
    @@ -0,0 +1,854 @@
    +/*
    + * nilfs2_fs.h - NILFS2 on-disk structures and common declarations.
    + *
    + * 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 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, write to the Free Software
    + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
    + *
    + * Written by Koji Sato <koji@osrg.net>
    + * Ryusuke Konishi <ryusuke@osrg.net>
    + */
    +/*
    + * linux/include/linux/ext2_fs.h
    + *
    + * Copyright (C) 1992, 1993, 1994, 1995
    + * Remy Card (card@masi.ibp.fr)
    + * Laboratoire MASI - Institut Blaise Pascal
    + * Universite Pierre et Marie Curie (Paris VI)
    + *
    + * from
    + *
    + * linux/include/linux/minix_fs.h
    + *
    + * Copyright (C) 1991, 1992 Linus Torvalds
    + */
    +
    +#ifndef _LINUX_NILFS_FS_H
    +#define _LINUX_NILFS_FS_H
    +
    +#include <linux/types.h>
    +#include <linux/ioctl.h>
    +
    +/*
    + * Inode flags stored in nilfs_inode and on-memory nilfs inode
    + *
    + * We define these flags based on ext2-fs because of the
    + * compatibility reason; to avoid problems in chattr(1)
    + */
    +#define NILFS_SECRM_FL 0x00000001 /* Secure deletion */
    +#define NILFS_UNRM_FL 0x00000002 /* Undelete */
    +#define NILFS_SYNC_FL 0x00000008 /* Synchronous updates */
    +#define NILFS_IMMUTABLE_FL 0x00000010 /* Immutable file */
    +#define NILFS_APPEND_FL 0x00000020 /* writes to file may only append */
    +#define NILFS_NODUMP_FL 0x00000040 /* do not dump file */
    +#define NILFS_NOATIME_FL 0x00000080 /* do not update atime */
    +/* Reserved for compression usage... */
    +#define NILFS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
    +#define NILFS_DIRSYNC_FL 0x00010000 /* dirsync behaviour */
    +
    +#define NILFS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
    +#define NILFS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
    +
    +
    +#define NILFS_INODE_BMAP_SIZE 7
    +/**
    + * struct nilfs_inode - structure of an inode on disk
    + * @i_blocks: blocks count
    + * @i_size: size in bytes
    + * @i_ctime: creation time
    + * @i_mtime: modification time
    + * @i_dtime: deletion time
    + * @i_uid: user id
    + * @i_gid: group id
    + * @i_mode: file mode
    + * @i_links_count: links count
    + * @i_flags: file flags
    + * @i_bmap: block mapping
    + * @i_xattr: extended attributes
    + * @i_generation: file generation (for NFS)
    + * @i_pad: padding
    + */
    +struct nilfs_inode {
    + __le64 i_blocks;
    + __le64 i_size;
    + __le64 i_ctime;
    + __le64 i_mtime;
    + __le64 i_dtime;
    + __le32 i_uid;
    + __le32 i_gid;
    + __le16 i_mode;
    + __le16 i_links_count;
    + __le32 i_flags;
    + __le64 i_bmap[NILFS_INODE_BMAP_SIZE];
    +#define i_device_code i_bmap[0]
    + __le64 i_xattr;
    + __le32 i_generation;
    + __le32 i_pad;
    +};
    +
    +/**
    + * struct nilfs_super_root - structure of super root
    + * @sr_sum: check sum
    + * @sr_bytes: byte count of the structure
    + * @sr_flags: flags (reserved)
    + * @sr_nongc_ctime: write time of the last segment not for cleaner operation
    + * @sr_dat: DAT file inode
    + * @sr_cpfile: checkpoint file inode
    + * @sr_sufile: segment usage file inode
    + */
    +struct nilfs_super_root {
    + __le32 sr_sum;
    + __le16 sr_bytes;
    + __le16 sr_flags;
    + __le64 sr_nongc_ctime;
    + struct nilfs_inode sr_dat;
    + struct nilfs_inode sr_cpfile;
    + struct nilfs_inode sr_sufile;
    +};
    +
    +#define NILFS_SR_MDT_OFFSET(inode_size, i) \
    + ((unsigned long)&((struct nilfs_super_root *)0)->sr_dat + \
    + (inode_size) * (i))
    +#define NILFS_SR_DAT_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 0)
    +#define NILFS_SR_CPFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 1)
    +#define NILFS_SR_SUFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 2)
    +#define NILFS_SR_BYTES (sizeof(struct nilfs_super_root))
    +
    +/*
    + * Maximal mount counts
    + */
    +#define NILFS_DFL_MAX_MNT_COUNT 50 /* 50 mounts */
    +
    +/*
    + * File system states (sbp->s_state, nilfs->ns_mount_state)
    + */
    +#define NILFS_VALID_FS 0x0001 /* Unmounted cleanly */
    +#define NILFS_ERROR_FS 0x0002 /* Errors detected */
    +#define NILFS_RESIZE_FS 0x0004 /* Resize required */
    +
    +/*
    + * Mount flags (sbi->s_mount_opt)
    + */
    +#define NILFS_MOUNT_ERROR_MODE 0x0070 /* Error mode mask */
    +#define NILFS_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
    +#define NILFS_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
    +#define NILFS_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
    +#define NILFS_MOUNT_SNAPSHOT 0x0080 /* Snapshot flag */
    +#define NILFS_MOUNT_BARRIER 0x1000 /* Use block barriers */
    +#define NILFS_MOUNT_STRICT_ORDER 0x2000 /* Apply strict in-order
    + semantics also for data */
    +
    +
    +/**
    + * struct nilfs_super_block - structure of super block on disk
    + */
    +struct nilfs_super_block {
    + __le32 s_rev_level; /* Revision level */
    + __le16 s_minor_rev_level; /* minor revision level */
    + __le16 s_magic; /* Magic signature */
    +
    + __le16 s_bytes; /* Bytes count of CRC calculation
    + for this structure. s_reserved
    + is excluded. */
    + __le16 s_flags; /* flags */
    + __le32 s_crc_seed; /* Seed value of CRC calculation */
    + __le32 s_sum; /* Check sum of super block */
    +
    + __le32 s_log_block_size; /* Block size represented as follows
    + blocksize =
    + 1 << (s_log_block_size + 10) */
    + __le64 s_nsegments; /* Number of segments in filesystem */
    + __le64 s_dev_size; /* block device size in bytes */
    + __le64 s_first_data_block; /* 1st seg disk block number */
    + __le32 s_blocks_per_segment; /* number of blocks per full segment */
    + __le32 s_r_segments_percentage; /* Reserved segments percentage */
    +
    + __le64 s_last_cno; /* Last checkpoint number */
    + __le64 s_last_pseg; /* disk block addr pseg written last */
    + __le64 s_last_seq; /* seq. number of seg written last */
    + __le64 s_free_blocks_count; /* Free blocks count */
    +
    + __le64 s_ctime; /* Creation time (execution time of
    + newfs) */
    + __le64 s_mtime; /* Mount time */
    + __le64 s_wtime; /* Write time */
    + __le16 s_mnt_count; /* Mount count */
    + __le16 s_max_mnt_count; /* Maximal mount count */
    + __le16 s_state; /* File system state */
    + __le16 s_errors; /* Behaviour when detecting errors */
    + __le64 s_lastcheck; /* time of last check */
    +
    + __le32 s_checkinterval; /* max. time between checks */
    + __le32 s_creator_os; /* OS */
    + __le16 s_def_resuid; /* Default uid for reserved blocks */
    + __le16 s_def_resgid; /* Default gid for reserved blocks */
    + __le32 s_first_ino; /* First non-reserved inode */
    +
    + __le16 s_inode_size; /* Size of an inode */
    + __le16 s_dat_entry_size; /* Size of a dat entry */
    + __le16 s_checkpoint_size; /* Size of a checkpoint */
    + __le16 s_segment_usage_size; /* Size of a segment usage */
    +
    + __u8 s_uuid[16]; /* 128-bit uuid for volume */
    + char s_volume_name[16]; /* volume name */
    + char s_last_mounted[64]; /* directory where last mounted */
    +
    + __le32 s_c_interval; /* Commit interval of segment */
    + __le32 s_c_block_max; /* Threshold of data amount for
    + the segment construction */
    + __u32 s_reserved[192]; /* padding to the end of the block */
    +};
    +
    +/*
    + * Codes for operating systems
    + */
    +#define NILFS_OS_LINUX 0
    +/* Codes from 1 to 4 are reserved to keep compatibility with ext2 creator-OS */
    +
    +/*
    + * Revision levels
    + */
    +#define NILFS_CURRENT_REV 2 /* current major revision */
    +#define NILFS_MINOR_REV 0 /* minor revision */
    +
    +/*
    + * Bytes count of super_block for CRC-calculation
    + */
    +#define NILFS_SB_BYTES \
    + ((long)&((struct nilfs_super_block *)0)->s_reserved)
    +
    +/*
    + * Special inode number
    + */
    +#define NILFS_ROOT_INO 2 /* Root file inode */
    +#define NILFS_DAT_INO 3 /* DAT file */
    +#define NILFS_CPFILE_INO 4 /* checkpoint file */
    +#define NILFS_SUFILE_INO 5 /* segment usage file */
    +#define NILFS_IFILE_INO 6 /* ifile */
    +#define NILFS_ATIME_INO 7 /* Atime file (reserved) */
    +#define NILFS_XATTR_INO 8 /* Xattribute file (reserved) */
    +#define NILFS_SKETCH_INO 10 /* Sketch file */
    +#define NILFS_USER_INO 11 /* Fisrt user's file inode number */
    +
    +#define NILFS_SB_OFFSET_BYTES 1024 /* byte offset of nilfs superblock */
    +#define NILFS_SUPER_MAGIC 0x3434 /* NILFS filesystem magic number */
    +
    +#define NILFS_SEG_MIN_BLOCKS 16 /* Minimum number of blocks in
    + a full segment */
    +#define NILFS_PSEG_MIN_BLOCKS 2 /* Minimum number of blocks in
    + a partial segment */
    +#define NILFS_MIN_NRSVSEGS 8 /* Minimum number of reserved
    + segments */
    +
    +
    +/*
    + * Maximal count of links to a file
    + */
    +#define NILFS_LINK_MAX 32000
    +
    +/*
    + * Structure of a directory entry
    + * (Same as ext2)
    + */
    +
    +#define NILFS_NAME_LEN 255
    +
    +/*
    + * The new version of the directory entry. Since V0 structures are
    + * stored in intel byte order, and the name_len field could never be
    + * bigger than 255 chars, it's safe to reclaim the extra byte for the
    + * file_type field.
    + */
    +struct nilfs_dir_entry {
    + __le64 inode; /* Inode number */
    + __le16 rec_len; /* Directory entry length */
    + __u8 name_len; /* Name length */
    + __u8 file_type;
    + char name[NILFS_NAME_LEN]; /* File name */
    + char pad;
    +};
    +
    +/*
    + * NILFS directory file types. Only the low 3 bits are used. The
    + * other bits are reserved for now.
    + */
    +enum {
    + NILFS_FT_UNKNOWN,
    + NILFS_FT_REG_FILE,
    + NILFS_FT_DIR,
    + NILFS_FT_CHRDEV,
    + NILFS_FT_BLKDEV,
    + NILFS_FT_FIFO,
    + NILFS_FT_SOCK,
    + NILFS_FT_SYMLINK,
    + NILFS_FT_MAX
    +};
    +
    +/*
    + * NILFS_DIR_PAD defines the directory entries boundaries
    + *
    + * NOTE: It must be a multiple of 8
    + */
    +#define NILFS_DIR_PAD 8
    +#define NILFS_DIR_ROUND (NILFS_DIR_PAD - 1)
    +#define NILFS_DIR_REC_LEN(name_len) (((name_len) + 12 + NILFS_DIR_ROUND) & \
    + ~NILFS_DIR_ROUND)
    +
    +
    +/**
    + * struct nilfs_finfo - file information
    + * @fi_ino: inode number
    + * @fi_cno: checkpoint number
    + * @fi_nblocks: number of blocks (including intermediate blocks)
    + * @fi_ndatablk: number of file data blocks
    + */
    +struct nilfs_finfo {
    + __le64 fi_ino;
    + __le64 fi_cno;
    + __le32 fi_nblocks;
    + __le32 fi_ndatablk;
    + /* array of virtual block numbers */
    +};
    +
    +/**
    + * struct nilfs_binfo_v - information for the block to which a virtual block number is assigned
    + * @bi_vblocknr: virtual block number
    + * @bi_blkoff: block offset
    + */
    +struct nilfs_binfo_v {
    + __le64 bi_vblocknr;
    + __le64 bi_blkoff;
    +};
    +
    +/**
    + * struct nilfs_binfo_dat - information for the block which belongs to the DAT file
    + * @bi_blkoff: block offset
    + * @bi_level: level
    + * @bi_pad: padding
    + */
    +struct nilfs_binfo_dat {
    + __le64 bi_blkoff;
    + __u8 bi_level;
    + __u8 bi_pad[7];
    +};
    +
    +/**
    + * union nilfs_binfo: block information
    + * @bi_v: nilfs_binfo_v structure
    + * @bi_dat: nilfs_binfo_dat structure
    + */
    +union nilfs_binfo {
    + struct nilfs_binfo_v bi_v;
    + struct nilfs_binfo_dat bi_dat;
    +};
    +
    +/**
    + * struct nilfs_segment_summary - segment summary
    + * @ss_datasum: checksum of data
    + * @ss_sumsum: checksum of segment summary
    + * @ss_magic: magic number
    + * @ss_bytes: size of this structure in bytes
    + * @ss_flags: flags
    + * @ss_seq: sequence number
    + * @ss_create: creation timestamp
    + * @ss_next: next segment
    + * @ss_nblocks: number of blocks
    + * @ss_nfinfo: number of finfo structures
    + * @ss_sumbytes: total size of segment summary in bytes
    + * @ss_pad: padding
    + */
    +struct nilfs_segment_summary {
    + __le32 ss_datasum;
    + __le32 ss_sumsum;
    + __le32 ss_magic;
    + __le16 ss_bytes;
    + __le16 ss_flags;
    + __le64 ss_seq;
    + __le64 ss_create;
    + __le64 ss_next;
    + __le32 ss_nblocks;
    + __le32 ss_nfinfo;
    + __le32 ss_sumbytes;
    + __le32 ss_pad;
    + /* array of finfo structures */
    +};
    +
    +#define NILFS_SEGSUM_MAGIC 0x1eaffa11 /* segment summary magic number */
    +
    +/*
    + * Segment summary flags
    + */
    +#define NILFS_SS_LOGBGN 0x0001 /* begins a logical segment */
    +#define NILFS_SS_LOGEND 0x0002 /* ends a logical segment */
    +#define NILFS_SS_SR 0x0004 /* has super root */
    +#define NILFS_SS_SYNDT 0x0008 /* includes data only updates */
    +#define NILFS_SS_GC 0x0010 /* segment written for cleaner operation */
    +
    +/**
    + * struct nilfs_palloc_group_desc - block group descriptor
    + * @pg_nfrees: number of free entries in block group
    + */
    +struct nilfs_palloc_group_desc {
    + __le32 pg_nfrees;
    +};
    +
    +/**
    + * struct nilfs_dat_entry - disk address translation entry
    + * @dt_blocknr: block number
    + * @dt_start: start checkpoint number
    + * @dt_end: end checkpoint number
    + * @dt_rsv: reserved for future use
    + */
    +struct nilfs_dat_entry {
    + __le64 de_blocknr;
    + __le64 de_start;
    + __le64 de_end;
    + __le64 de_rsv;
    +};
    +
    +/**
    + * struct nilfs_dat_group_desc - block group descriptor
    + * @dg_nfrees: number of free virtual block numbers in block group
    + */
    +struct nilfs_dat_group_desc {
    + __le32 dg_nfrees;
    +};
    +
    +
    +/**
    + * struct nilfs_snapshot_list - snapshot list
    + * @ssl_next: next checkpoint number on snapshot list
    + * @ssl_prev: previous checkpoint number on snapshot list
    + */
    +struct nilfs_snapshot_list {
    + __le64 ssl_next;
    + __le64 ssl_prev;
    +};
    +
    +/**
    + * struct nilfs_checkpoint - checkpoint structure
    + * @cp_flags: flags
    + * @cp_checkpoints_count: checkpoints count in a block
    + * @cp_snapshot_list: snapshot list
    + * @cp_cno: checkpoint number
    + * @cp_create: creation timestamp
    + * @cp_nblk_inc: number of blocks incremented by this checkpoint
    + * @cp_inodes_count: inodes count
    + * @cp_blocks_count: blocks count
    + * @cp_ifile_inode: inode of ifile
    + */
    +struct nilfs_checkpoint {
    + __le32 cp_flags;
    + __le32 cp_checkpoints_count;
    + struct nilfs_snapshot_list cp_snapshot_list;
    + __le64 cp_cno;
    + __le64 cp_create;
    + __le64 cp_nblk_inc;
    + __le64 cp_inodes_count;
    + __le64 cp_blocks_count; /* Reserved (might be deleted) */
    +
    + /* Do not change the byte offset of ifile inode.
    + To keep the compatibility of the disk format,
    + additional fields should be added behind cp_ifile_inode. */
    + struct nilfs_inode cp_ifile_inode;
    +};
    +
    +/* checkpoint flags */
    +enum {
    + NILFS_CHECKPOINT_SNAPSHOT,
    + NILFS_CHECKPOINT_INVALID,
    + NILFS_CHECKPOINT_SKETCH,
    +};
    +
    +#define NILFS_CHECKPOINT_FNS(flag, name) \
    +static inline void \
    +nilfs_checkpoint_set_##name(struct nilfs_checkpoint *cp) \
    +{ \
    + cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) | \
    + (1UL << NILFS_CHECKPOINT_##flag)); \
    +} \
    +static inline void \
    +nilfs_checkpoint_clear_##name(struct nilfs_checkpoint *cp) \
    +{ \
    + cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) & \
    + ~(1UL << NILFS_CHECKPOINT_##flag)); \
    +} \
    +static inline int \
    +nilfs_checkpoint_##name(const struct nilfs_checkpoint *cp) \
    +{ \
    + return !!(le32_to_cpu(cp->cp_flags) & \
    + (1UL << NILFS_CHECKPOINT_##flag)); \
    +}
    +
    +NILFS_CHECKPOINT_FNS(SNAPSHOT, snapshot)
    +NILFS_CHECKPOINT_FNS(INVALID, invalid)
    +NILFS_CHECKPOINT_FNS(SKETCH, sketch)
    +
    +/**
    + * struct nilfs_cpinfo - checkpoint information
    + * @ci_flags: flags
    + * @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;
    + __u64 ci_cno;
    + __u64 ci_create;
    + __u64 ci_nblk_inc;
    + __u64 ci_inodes_count;
    + __u64 ci_blocks_count;
    + __u64 ci_next;
    +};
    +
    +#define NILFS_CPINFO_FNS(flag, name) \
    +static inline int \
    +nilfs_cpinfo_##name(const struct nilfs_cpinfo *cpinfo) \
    +{ \
    + return !!(cpinfo->ci_flags & (1UL << NILFS_CHECKPOINT_##flag)); \
    +}
    +
    +NILFS_CPINFO_FNS(SNAPSHOT, snapshot)
    +NILFS_CPINFO_FNS(INVALID, invalid)
    +NILFS_CPINFO_FNS(SKETCH, sketch)
    +
    +
    +/**
    + * struct nilfs_cpfile_header - checkpoint file header
    + * @ch_ncheckpoints: number of checkpoints
    + * @ch_nsnapshots: number of snapshots
    + * @ch_snapshot_list: snapshot list
    + */
    +struct nilfs_cpfile_header {
    + __le64 ch_ncheckpoints;
    + __le64 ch_nsnapshots;
    + struct nilfs_snapshot_list ch_snapshot_list;
    +};
    +
    +#define NILFS_CPFILE_FIRST_CHECKPOINT_OFFSET \
    + ((sizeof(struct nilfs_cpfile_header) + \
    + sizeof(struct nilfs_checkpoint) - 1) / \
    + sizeof(struct nilfs_checkpoint))
    +
    +/**
    + * struct nilfs_segment_usage - segment usage
    + * @su_lastmod: last modified timestamp
    + * @su_nblocks: number of blocks in segment
    + * @su_flags: flags
    + */
    +struct nilfs_segment_usage {
    + __le64 su_lastmod;
    + __le32 su_nblocks;
    + __le32 su_flags;
    +};
    +
    +/* segment usage flag */
    +enum {
    + NILFS_SEGMENT_USAGE_ACTIVE,
    + NILFS_SEGMENT_USAGE_DIRTY,
    + NILFS_SEGMENT_USAGE_ERROR,
    +
    + /* on-memory only */
    + NILFS_SEGMENT_USAGE_VOLATILE_ACTIVE,
    + /* ... */
    +};
    +
    +#define NILFS_SEGMENT_USAGE_FNS(flag, name) \
    +static inline void \
    +nilfs_segment_usage_set_##name(struct nilfs_segment_usage *su) \
    +{ \
    + su->su_flags = cpu_to_le32(le32_to_cpu(su->su_flags) | \
    + (1UL << NILFS_SEGMENT_USAGE_##flag));\
    +} \
    +static inline void \
    +nilfs_segment_usage_clear_##name(struct nilfs_segment_usage *su) \
    +{ \
    + su->su_flags = \
    + cpu_to_le32(le32_to_cpu(su->su_flags) & \
    + ~(1UL << NILFS_SEGMENT_USAGE_##flag)); \
    +} \
    +static inline int \
    +nilfs_segment_usage_##name(const struct nilfs_segment_usage *su) \
    +{ \
    + return !!(le32_to_cpu(su->su_flags) & \
    + (1UL << NILFS_SEGMENT_USAGE_##flag)); \
    +}
    +
    +NILFS_SEGMENT_USAGE_FNS(ACTIVE, active)
    +NILFS_SEGMENT_USAGE_FNS(DIRTY, dirty)
    +NILFS_SEGMENT_USAGE_FNS(ERROR, error)
    +NILFS_SEGMENT_USAGE_FNS(VOLATILE_ACTIVE, volatile_active)
    +
    +static inline void
    +nilfs_segment_usage_set_clean(struct nilfs_segment_usage *su)
    +{
    + su->su_lastmod = cpu_to_le64(0);
    + su->su_nblocks = cpu_to_le32(0);
    + su->su_flags = cpu_to_le32(0);
    +}
    +
    +static inline int
    +nilfs_segment_usage_clean(const struct nilfs_segment_usage *su)
    +{
    + return !le32_to_cpu(su->su_flags);
    +}
    +
    +/**
    + * struct nilfs_sufile_header - segment usage file header
    + * @sh_ncleansegs: number of clean segments
    + * @sh_ndirtysegs: number of dirty segments
    + * @sh_last_alloc: last allocated segment number
    + */
    +struct nilfs_sufile_header {
    + __le64 sh_ncleansegs;
    + __le64 sh_ndirtysegs;
    + __le64 sh_last_alloc;
    + /* ... */
    +};
    +
    +#define NILFS_SUFILE_FIRST_SEGMENT_USAGE_OFFSET \
    + ((sizeof(struct nilfs_sufile_header) + \
    + sizeof(struct nilfs_segment_usage) - 1) / \
    + sizeof(struct nilfs_segment_usage))
    +
    +/**
    + * nilfs_suinfo - segment usage information
    + * @sui_lastmod:
    + * @sui_nblocks:
    + * @sui_flags:
    + */
    +struct nilfs_suinfo {
    + __u64 sui_lastmod;
    + __u32 sui_nblocks;
    + __u32 sui_flags;
    +};
    +
    +#define NILFS_SUINFO_FNS(flag, name) \
    +static inline int \
    +nilfs_suinfo_##name(const struct nilfs_suinfo *si) \
    +{ \
    + return si->sui_flags & (1UL << NILFS_SEGMENT_USAGE_##flag); \
    +}
    +
    +NILFS_SUINFO_FNS(ACTIVE, active)
    +NILFS_SUINFO_FNS(DIRTY, dirty)
    +NILFS_SUINFO_FNS(ERROR, error)
    +NILFS_SUINFO_FNS(VOLATILE_ACTIVE, volatile_active)
    +
    +static inline int nilfs_suinfo_clean(const struct nilfs_suinfo *si)
    +{
    + return !si->sui_flags;
    +}
    +
    +/* ioctl */
    +enum {
    + NILFS_CHECKPOINT,
    + NILFS_SNAPSHOT,
    +};
    +
    +/**
    + * struct nilfs_cpmode -
    + * @cc_cno:
    + * @cc_mode:
    + */
    +struct nilfs_cpmode {
    + __u64 cm_cno;
    + int cm_mode;
    +};
    +
    +/**
    + * struct nilfs_argv - argument vector
    + * @v_base:
    + * @v_nmembs:
    + * @v_size:
    + * @v_index:
    + * @v_flags:
    + */
    +struct nilfs_argv {
    + void *v_base;
    + size_t v_nmembs; /* number of members */
    + size_t v_size; /* size of members */
    + int v_index;
    + int v_flags;
    +};
    +
    +/**
    + * struct nilfs_period -
    + * @p_start:
    + * @p_end:
    + */
    +struct nilfs_period {
    + __u64 p_start;
    + __u64 p_end;
    +};
    +
    +/**
    + * struct nilfs_cpstat -
    + * @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 -
    + * @ss_nsegs: number of segments
    + * @ss_ncleansegs: number of clean segments
    + * @ss_ndirtysegs: number of dirty segments
    + * @ss_ctime:
    + * @ss_nongc_ctime:
    + */
    +struct nilfs_sustat {
    + __u64 ss_nsegs;
    + __u64 ss_ncleansegs;
    + __u64 ss_ndirtysegs;
    + time_t ss_ctime;
    + time_t ss_nongc_ctime;
    +};
    +
    +/**
    + * struct nilfs_vinfo - virtual block number information
    + * @vi_vblocknr:
    + * @vi_start:
    + * @vi_end:
    + * @vi_blocknr:
    + */
    +struct nilfs_vinfo {
    + __u64 vi_vblocknr;
    + __u64 vi_start;
    + __u64 vi_end;
    + __u64 vi_blocknr;
    +};
    +
    +/**
    + * struct nilfs_vdesc -
    + */
    +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;
    +};
    +
    +/**
    + * struct nilfs_bdesc -
    + */
    +struct nilfs_bdesc {
    + __u64 bd_ino;
    + __u64 bd_oblocknr;
    + __u64 bd_blocknr;
    + __u64 bd_offset;
    + __u32 bd_level;
    +};
    +
    +#define NILFS_TIMEDWAIT_WRITE_LOCKED 0x1
    +#define NILFS_TIMEDWAIT_SEG_WRITE 0x2
    +
    +/**
    + * struct nilfs_wait_cond -
    + */
    +struct nilfs_wait_cond {
    + int wc_cond;
    + int wc_flags;
    + struct timespec wc_timeout;
    +};
    +
    +#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_TIMEDWAIT \
    + _IOWR(NILFS_IOCTL_IDENT, 0x89, struct nilfs_wait_cond)
    +#define NILFS_IOCTL_SYNC \
    + _IOR(NILFS_IOCTL_IDENT, 0x8A, __u64)
    +#define NILFS_IOCTL_RESIZE \
    + _IOW(NILFS_IOCTL_IDENT, 0x8B, __u64)
    +
    +/* compat_ioctl */
    +#ifdef CONFIG_COMPAT
    +#include <linux/compat.h>
    +
    +struct nilfs_cpmode32 {
    + __u64 cm_cno;
    + compat_int_t cm_mode;
    +};
    +
    +struct nilfs_argv32 {
    + compat_caddr_t v_base;
    + compat_size_t v_nmembs;
    + compat_size_t v_size;
    + compat_int_t v_index;
    + compat_int_t v_flags;
    +};
    +
    +struct nilfs_sustat32 {
    + __u64 ss_nsegs;
    + __u64 ss_ncleansegs;
    + __u64 ss_ndirtysegs;
    + compat_time_t ss_ctime;
    + compat_time_t ss_nongc_ctime;
    +};
    +
    +struct nilfs_wait_cond32 {
    + compat_int_t wc_cond;
    + compat_int_t wc_flags;
    + struct compat_timespec wc_timeout;
    +};
    +
    +#define NILFS_IOCTL32_CHANGE_CPMODE \
    + _IOW(NILFS_IOCTL_IDENT, 0x80, struct nilfs_cpmode32)
    +#define NILFS_IOCTL32_GET_CPINFO \
    + _IOR(NILFS_IOCTL_IDENT, 0x82, struct nilfs_argv32)
    +#define NILFS_IOCTL32_GET_SUINFO \
    + _IOR(NILFS_IOCTL_IDENT, 0x84, struct nilfs_argv32)
    +#define NILFS_IOCTL32_GET_SUSTAT \
    + _IOR(NILFS_IOCTL_IDENT, 0x85, struct nilfs_sustat32)
    +#define NILFS_IOCTL32_GET_VINFO \
    + _IOWR(NILFS_IOCTL_IDENT, 0x86, struct nilfs_argv32)
    +#define NILFS_IOCTL32_GET_BDESCS \
    + _IOWR(NILFS_IOCTL_IDENT, 0x87, struct nilfs_argv32)
    +#define NILFS_IOCTL32_CLEAN_SEGMENTS \
    + _IOW(NILFS_IOCTL_IDENT, 0x88, struct nilfs_argv32[5])
    +#define NILFS_IOCTL32_TIMEDWAIT \
    + _IOWR(NILFS_IOCTL_IDENT, 0x89, struct nilfs_wait_cond32)
    +#endif /* CONFIG_COMPAT */
    +
    +#endif /* _LINUX_NILFS_FS_H */
    --
    1.5.6.3


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      Last update: 2008-09-14 21:19    [W:0.064 / U:3.988 seconds]
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