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linux-next/include/linux/nilfs2_fs.h
Ryusuke Konishi 0ec060d188 nilfs2: verify metadata sizes read from disk 
Add code to check sizes of on-disk data of metadata files such as inode
size, segment usage size, DAT entry size, and checkpoint size.  Although
these sizes are read from disk, the current implementation doesn't check
them.

If these sizes are not sane on disk, it can cause out-of-range access to
metadata or memory access overrun on metadata block buffers due to
overflow in sundry calculations.

Both lower limit and upper limit of metadata sizes are verified to
prevent these issues.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Cc: Andreas Rohner <andreas.rohner@gmx.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-04-03 16:21:26 -07:00

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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 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.
*
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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>
#include <linux/magic.h>
#include <linux/bug.h>
#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;
};
#define NILFS_MIN_INODE_SIZE 128
/**
* 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(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 3)
/*
* 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_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 */
#define NILFS_MOUNT_DISCARD 0x8000 /* Issue DISCARD requests */
/**
* struct nilfs_super_block - structure of super block on disk
*/
struct nilfs_super_block {
/*00*/ __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 */
/*10*/ __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 */
/*20*/ __le64 s_dev_size; /* block device size in bytes */
__le64 s_first_data_block; /* 1st seg disk block number */
/*30*/ __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 */
/*40*/ __le64 s_last_pseg; /* disk block addr pseg written last */
__le64 s_last_seq; /* seq. number of seg written last */
/*50*/ __le64 s_free_blocks_count; /* Free blocks count */
__le64 s_ctime; /* Creation time (execution time of
newfs) */
/*60*/ __le64 s_mtime; /* Mount time */
__le64 s_wtime; /* Write time */
/*70*/ __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 */
/*80*/ __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 */
/*90*/ __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 */
/*98*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
/*A8*/ char s_volume_name[80]; /* volume name */
/*F8*/ __le32 s_c_interval; /* Commit interval of segment */
__le32 s_c_block_max; /* Threshold of data amount for
the segment construction */
/*100*/ __le64 s_feature_compat; /* Compatible feature set */
__le64 s_feature_compat_ro; /* Read-only compatible feature set */
__le64 s_feature_incompat; /* Incompatible feature set */
__u32 s_reserved[186]; /* 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 */
#define NILFS_MIN_SUPP_REV 2 /* minimum supported revision */
/*
* Feature set definitions
*
* If there is a bit set in the incompatible feature set that the kernel
* doesn't know about, it should refuse to mount the filesystem.
*/
#define NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT 0x00000001ULL
#define NILFS_FEATURE_COMPAT_SUPP 0ULL
#define NILFS_FEATURE_COMPAT_RO_SUPP NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT
#define NILFS_FEATURE_INCOMPAT_SUPP 0ULL
/*
* 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_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 */
/*
* We call DAT, cpfile, and sufile root metadata files. Inodes of
* these files are written in super root block instead of ifile, and
* garbage collector doesn't keep any past versions of these files.
*/
#define NILFS_ROOT_METADATA_FILE(ino) \
((ino) >= NILFS_DAT_INO && (ino) <= NILFS_SUFILE_INO)
/*
* 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
/*
* Block size limitations
*/
#define NILFS_MIN_BLOCK_SIZE 1024
#define NILFS_MAX_BLOCK_SIZE 65536
/*
* 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; /* Dir entry type (file, dir, etc) */
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)
#define NILFS_MAX_REC_LEN ((1<<16)-1)
static inline unsigned nilfs_rec_len_from_disk(__le16 dlen)
{
unsigned len = le16_to_cpu(dlen);
#if !defined(__KERNEL__) || (PAGE_CACHE_SIZE >= 65536)
if (len == NILFS_MAX_REC_LEN)
return 1 << 16;
#endif
return len;
}
static inline __le16 nilfs_rec_len_to_disk(unsigned len)
{
#if !defined(__KERNEL__) || (PAGE_CACHE_SIZE >= 65536)
if (len == (1 << 16))
return cpu_to_le16(NILFS_MAX_REC_LEN);
else if (len > (1 << 16))
BUG();
#endif
return cpu_to_le16(len);
}
/**
* 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 header
* @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
* @ss_cno: checkpoint number
*/
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;
__le64 ss_cno;
/* 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
* @de_blocknr: block number
* @de_start: start checkpoint number
* @de_end: end checkpoint number
* @de_rsv: reserved for future use
*/
struct nilfs_dat_entry {
__le64 de_blocknr;
__le64 de_start;
__le64 de_end;
__le64 de_rsv;
};
#define NILFS_MIN_DAT_ENTRY_SIZE 32
/**
* 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;
/* 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;
};
#define NILFS_MIN_CHECKPOINT_SIZE (64 + NILFS_MIN_INODE_SIZE)
/* 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;
};
#define NILFS_MIN_SEGMENT_USAGE_SIZE 16
/* 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: 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;
};
#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 */
/**
* 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_NILFS_FS_H */
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