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linux-next/include/linux/nilfs2_fs.h
Ryusuke Konishi 0234576d04 nilfs2: add norecovery mount option 
This adds "norecovery" mount option which disables temporal write
access to read-only mounts or snapshots during mount/recovery.
Without this option, write access will be even performed for those
types of mounts; the temporal write access is needed to mount root
file system read-only after an unclean shutdown.

This option will be helpful when user wants to prevent any write
access to the device.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Cc: Eric Sandeen <sandeen@redhat.com>
2009-11-20 10:05:52 +09:00

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/*
* 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 (seconds)
* @i_mtime: modification time (seconds)
* @i_ctime_nsec: creation time (nano seconds)
* @i_mtime_nsec: modification time (nano seconds)
* @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;
__le32 i_ctime_nsec;
__le32 i_mtime_nsec;
__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 */
#define NILFS_MOUNT_NORECOVERY 0x4000 /* Disable write access during
mount-time recovery */
/**
* 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 */
/*
* bytes offset of secondary super block
*/
#define NILFS_SB2_OFFSET_BYTES(devsize) ((((devsize) >> 12) - 1) << 12)
/*
* 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_btree_node - B-tree node
* @bn_flags: flags
* @bn_level: level
* @bn_nchildren: number of children
* @bn_pad: padding
*/
struct nilfs_btree_node {
__u8 bn_flags;
__u8 bn_level;
__le16 bn_nchildren;
__le32 bn_pad;
};
/* flags */
#define NILFS_BTREE_NODE_ROOT 0x01
/* level */
#define NILFS_BTREE_LEVEL_DATA 0
#define NILFS_BTREE_LEVEL_NODE_MIN (NILFS_BTREE_LEVEL_DATA + 1)
#define NILFS_BTREE_LEVEL_MAX 14
/**
* 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_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,
NILFS_CHECKPOINT_MINOR,
};
#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(MINOR, minor)
/**
* 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;
};
#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(MINOR, minor)
/**
* 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,
/* ... */
};
#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)
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)
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;
__u32 cm_mode;
__u32 cm_pad;
};
/**
* struct nilfs_argv - argument vector
* @v_base:
* @v_nmembs:
* @v_size:
* @v_flags:
* @v_index:
*/
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 -
* @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: 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:
* @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;
__u32 vd_pad;
};
/**
* struct nilfs_bdesc -
*/
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)
#endif /* _LINUX_NILFS_FS_H */
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