450 lines
11 KiB
C
450 lines
11 KiB
C
/*
|
|
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
|
|
* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
|
|
*
|
|
* This copyrighted material is made available to anyone wishing to use,
|
|
* modify, copy, or redistribute it subject to the terms and conditions
|
|
* of the GNU General Public License v.2.
|
|
*/
|
|
|
|
#ifndef __GFS2_ONDISK_DOT_H__
|
|
#define __GFS2_ONDISK_DOT_H__
|
|
|
|
#define GFS2_MAGIC 0x01161970
|
|
#define GFS2_BASIC_BLOCK 512
|
|
#define GFS2_BASIC_BLOCK_SHIFT 9
|
|
|
|
/* Lock numbers of the LM_TYPE_NONDISK type */
|
|
|
|
#define GFS2_MOUNT_LOCK 0
|
|
#define GFS2_LIVE_LOCK 1
|
|
#define GFS2_TRANS_LOCK 2
|
|
#define GFS2_RENAME_LOCK 3
|
|
|
|
/* Format numbers for various metadata types */
|
|
|
|
#define GFS2_FORMAT_NONE 0
|
|
#define GFS2_FORMAT_SB 100
|
|
#define GFS2_FORMAT_RG 200
|
|
#define GFS2_FORMAT_RB 300
|
|
#define GFS2_FORMAT_DI 400
|
|
#define GFS2_FORMAT_IN 500
|
|
#define GFS2_FORMAT_LF 600
|
|
#define GFS2_FORMAT_JD 700
|
|
#define GFS2_FORMAT_LH 800
|
|
#define GFS2_FORMAT_LD 900
|
|
#define GFS2_FORMAT_LB 1000
|
|
#define GFS2_FORMAT_EA 1600
|
|
#define GFS2_FORMAT_ED 1700
|
|
#define GFS2_FORMAT_QC 1400
|
|
/* These are format numbers for entities contained in files */
|
|
#define GFS2_FORMAT_RI 1100
|
|
#define GFS2_FORMAT_DE 1200
|
|
#define GFS2_FORMAT_QU 1500
|
|
/* These are part of the superblock */
|
|
#define GFS2_FORMAT_FS 1801
|
|
#define GFS2_FORMAT_MULTI 1900
|
|
|
|
/*
|
|
* An on-disk inode number
|
|
*/
|
|
|
|
struct gfs2_inum {
|
|
__be64 no_formal_ino;
|
|
__be64 no_addr;
|
|
};
|
|
|
|
/*
|
|
* Generic metadata head structure
|
|
* Every inplace buffer logged in the journal must start with this.
|
|
*/
|
|
|
|
#define GFS2_METATYPE_NONE 0
|
|
#define GFS2_METATYPE_SB 1
|
|
#define GFS2_METATYPE_RG 2
|
|
#define GFS2_METATYPE_RB 3
|
|
#define GFS2_METATYPE_DI 4
|
|
#define GFS2_METATYPE_IN 5
|
|
#define GFS2_METATYPE_LF 6
|
|
#define GFS2_METATYPE_JD 7
|
|
#define GFS2_METATYPE_LH 8
|
|
#define GFS2_METATYPE_LD 9
|
|
#define GFS2_METATYPE_LB 12
|
|
#define GFS2_METATYPE_EA 10
|
|
#define GFS2_METATYPE_ED 11
|
|
#define GFS2_METATYPE_QC 14
|
|
|
|
struct gfs2_meta_header {
|
|
__be32 mh_magic;
|
|
__be32 mh_type;
|
|
__be64 __pad0; /* Was generation number in gfs1 */
|
|
__be32 mh_format;
|
|
__be32 __pad1; /* Was incarnation number in gfs1 */
|
|
};
|
|
|
|
/*
|
|
* super-block structure
|
|
*
|
|
* It's probably good if SIZEOF_SB <= GFS2_BASIC_BLOCK (512 bytes)
|
|
*
|
|
* Order is important, need to be able to read old superblocks to do on-disk
|
|
* version upgrades.
|
|
*/
|
|
|
|
/* Address of superblock in GFS2 basic blocks */
|
|
#define GFS2_SB_ADDR 128
|
|
|
|
/* The lock number for the superblock (must be zero) */
|
|
#define GFS2_SB_LOCK 0
|
|
|
|
/* Requirement: GFS2_LOCKNAME_LEN % 8 == 0
|
|
Includes: the fencing zero at the end */
|
|
#define GFS2_LOCKNAME_LEN 64
|
|
|
|
struct gfs2_sb {
|
|
struct gfs2_meta_header sb_header;
|
|
|
|
__be32 sb_fs_format;
|
|
__be32 sb_multihost_format;
|
|
__u32 __pad0; /* Was superblock flags in gfs1 */
|
|
|
|
__be32 sb_bsize;
|
|
__be32 sb_bsize_shift;
|
|
__u32 __pad1; /* Was journal segment size in gfs1 */
|
|
|
|
struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */
|
|
struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */
|
|
struct gfs2_inum sb_root_dir;
|
|
|
|
char sb_lockproto[GFS2_LOCKNAME_LEN];
|
|
char sb_locktable[GFS2_LOCKNAME_LEN];
|
|
|
|
struct gfs2_inum __pad3; /* Was quota inode in gfs1 */
|
|
struct gfs2_inum __pad4; /* Was licence inode in gfs1 */
|
|
#define GFS2_HAS_UUID 1
|
|
__u8 sb_uuid[16]; /* The UUID, maybe 0 for backwards compat */
|
|
};
|
|
|
|
/*
|
|
* resource index structure
|
|
*/
|
|
|
|
struct gfs2_rindex {
|
|
__be64 ri_addr; /* grp block disk address */
|
|
__be32 ri_length; /* length of rgrp header in fs blocks */
|
|
__u32 __pad;
|
|
|
|
__be64 ri_data0; /* first data location */
|
|
__be32 ri_data; /* num of data blocks in rgrp */
|
|
|
|
__be32 ri_bitbytes; /* number of bytes in data bitmaps */
|
|
|
|
__u8 ri_reserved[64];
|
|
};
|
|
|
|
/*
|
|
* resource group header structure
|
|
*/
|
|
|
|
/* Number of blocks per byte in rgrp */
|
|
#define GFS2_NBBY 4
|
|
#define GFS2_BIT_SIZE 2
|
|
#define GFS2_BIT_MASK 0x00000003
|
|
|
|
#define GFS2_BLKST_FREE 0
|
|
#define GFS2_BLKST_USED 1
|
|
#define GFS2_BLKST_UNLINKED 2
|
|
#define GFS2_BLKST_DINODE 3
|
|
|
|
#define GFS2_RGF_JOURNAL 0x00000001
|
|
#define GFS2_RGF_METAONLY 0x00000002
|
|
#define GFS2_RGF_DATAONLY 0x00000004
|
|
#define GFS2_RGF_NOALLOC 0x00000008
|
|
|
|
struct gfs2_rgrp {
|
|
struct gfs2_meta_header rg_header;
|
|
|
|
__be32 rg_flags;
|
|
__be32 rg_free;
|
|
__be32 rg_dinodes;
|
|
__be32 __pad;
|
|
__be64 rg_igeneration;
|
|
|
|
__u8 rg_reserved[80]; /* Several fields from gfs1 now reserved */
|
|
};
|
|
|
|
/*
|
|
* quota linked list: user quotas and group quotas form two separate
|
|
* singly linked lists. ll_next stores uids or gids of next quotas in the
|
|
* linked list.
|
|
|
|
Given the uid/gid, how to calculate the quota file offsets for the corresponding
|
|
gfs2_quota structures on disk:
|
|
|
|
for user quotas, given uid,
|
|
offset = uid * sizeof(struct gfs2_quota);
|
|
|
|
for group quotas, given gid,
|
|
offset = (gid * sizeof(struct gfs2_quota)) + sizeof(struct gfs2_quota);
|
|
|
|
|
|
uid:0 gid:0 uid:12 gid:12 uid:17 gid:17 uid:5142 gid:5142
|
|
+-------+-------+ +-------+-------+ +-------+- - - -+ +- - - -+-------+
|
|
| valid | valid | :: | valid | valid | :: | valid | inval | :: | inval | valid |
|
|
+-------+-------+ +-------+-------+ +-------+- - - -+ +- - - -+-------+
|
|
next:12 next:12 next:17 next:5142 next:NULL next:NULL
|
|
| | | | |<-- user quota list |
|
|
\______|___________/ \______|___________/ group quota list -->|
|
|
| | |
|
|
\__________________/ \_______________________________________/
|
|
|
|
*/
|
|
|
|
/*
|
|
* quota structure
|
|
*/
|
|
|
|
struct gfs2_quota {
|
|
__be64 qu_limit;
|
|
__be64 qu_warn;
|
|
__be64 qu_value;
|
|
__be32 qu_ll_next; /* location of next quota in list */
|
|
__u8 qu_reserved[60];
|
|
};
|
|
|
|
/*
|
|
* dinode structure
|
|
*/
|
|
|
|
#define GFS2_MAX_META_HEIGHT 10
|
|
#define GFS2_DIR_MAX_DEPTH 17
|
|
|
|
#define DT2IF(dt) (((dt) << 12) & S_IFMT)
|
|
#define IF2DT(sif) (((sif) & S_IFMT) >> 12)
|
|
|
|
enum {
|
|
gfs2fl_Jdata = 0,
|
|
gfs2fl_ExHash = 1,
|
|
gfs2fl_Unused = 2,
|
|
gfs2fl_EaIndirect = 3,
|
|
gfs2fl_Directio = 4,
|
|
gfs2fl_Immutable = 5,
|
|
gfs2fl_AppendOnly = 6,
|
|
gfs2fl_NoAtime = 7,
|
|
gfs2fl_Sync = 8,
|
|
gfs2fl_System = 9,
|
|
gfs2fl_TruncInProg = 29,
|
|
gfs2fl_InheritDirectio = 30,
|
|
gfs2fl_InheritJdata = 31,
|
|
};
|
|
|
|
/* Dinode flags */
|
|
#define GFS2_DIF_JDATA 0x00000001
|
|
#define GFS2_DIF_EXHASH 0x00000002
|
|
#define GFS2_DIF_UNUSED 0x00000004 /* only in gfs1 */
|
|
#define GFS2_DIF_EA_INDIRECT 0x00000008
|
|
#define GFS2_DIF_DIRECTIO 0x00000010
|
|
#define GFS2_DIF_IMMUTABLE 0x00000020
|
|
#define GFS2_DIF_APPENDONLY 0x00000040
|
|
#define GFS2_DIF_NOATIME 0x00000080
|
|
#define GFS2_DIF_SYNC 0x00000100
|
|
#define GFS2_DIF_SYSTEM 0x00000200 /* New in gfs2 */
|
|
#define GFS2_DIF_TRUNC_IN_PROG 0x20000000 /* New in gfs2 */
|
|
#define GFS2_DIF_INHERIT_DIRECTIO 0x40000000
|
|
#define GFS2_DIF_INHERIT_JDATA 0x80000000
|
|
|
|
struct gfs2_dinode {
|
|
struct gfs2_meta_header di_header;
|
|
|
|
struct gfs2_inum di_num;
|
|
|
|
__be32 di_mode; /* mode of file */
|
|
__be32 di_uid; /* owner's user id */
|
|
__be32 di_gid; /* owner's group id */
|
|
__be32 di_nlink; /* number of links to this file */
|
|
__be64 di_size; /* number of bytes in file */
|
|
__be64 di_blocks; /* number of blocks in file */
|
|
__be64 di_atime; /* time last accessed */
|
|
__be64 di_mtime; /* time last modified */
|
|
__be64 di_ctime; /* time last changed */
|
|
__be32 di_major; /* device major number */
|
|
__be32 di_minor; /* device minor number */
|
|
|
|
/* This section varies from gfs1. Padding added to align with
|
|
* remainder of dinode
|
|
*/
|
|
__be64 di_goal_meta; /* rgrp to alloc from next */
|
|
__be64 di_goal_data; /* data block goal */
|
|
__be64 di_generation; /* generation number for NFS */
|
|
|
|
__be32 di_flags; /* GFS2_DIF_... */
|
|
__be32 di_payload_format; /* GFS2_FORMAT_... */
|
|
__u16 __pad1; /* Was ditype in gfs1 */
|
|
__be16 di_height; /* height of metadata */
|
|
__u32 __pad2; /* Unused incarnation number from gfs1 */
|
|
|
|
/* These only apply to directories */
|
|
__u16 __pad3; /* Padding */
|
|
__be16 di_depth; /* Number of bits in the table */
|
|
__be32 di_entries; /* The number of entries in the directory */
|
|
|
|
struct gfs2_inum __pad4; /* Unused even in current gfs1 */
|
|
|
|
__be64 di_eattr; /* extended attribute block number */
|
|
__be32 di_atime_nsec; /* nsec portion of atime */
|
|
__be32 di_mtime_nsec; /* nsec portion of mtime */
|
|
__be32 di_ctime_nsec; /* nsec portion of ctime */
|
|
|
|
__u8 di_reserved[44];
|
|
};
|
|
|
|
/*
|
|
* directory structure - many of these per directory file
|
|
*/
|
|
|
|
#define GFS2_FNAMESIZE 255
|
|
#define GFS2_DIRENT_SIZE(name_len) ((sizeof(struct gfs2_dirent) + (name_len) + 7) & ~7)
|
|
|
|
struct gfs2_dirent {
|
|
struct gfs2_inum de_inum;
|
|
__be32 de_hash;
|
|
__be16 de_rec_len;
|
|
__be16 de_name_len;
|
|
__be16 de_type;
|
|
__u8 __pad[14];
|
|
};
|
|
|
|
/*
|
|
* Header of leaf directory nodes
|
|
*/
|
|
|
|
struct gfs2_leaf {
|
|
struct gfs2_meta_header lf_header;
|
|
|
|
__be16 lf_depth; /* Depth of leaf */
|
|
__be16 lf_entries; /* Number of dirents in leaf */
|
|
__be32 lf_dirent_format; /* Format of the dirents */
|
|
__be64 lf_next; /* Next leaf, if overflow */
|
|
|
|
__u8 lf_reserved[64];
|
|
};
|
|
|
|
/*
|
|
* Extended attribute header format
|
|
*/
|
|
|
|
#define GFS2_EA_MAX_NAME_LEN 255
|
|
#define GFS2_EA_MAX_DATA_LEN 65536
|
|
|
|
#define GFS2_EATYPE_UNUSED 0
|
|
#define GFS2_EATYPE_USR 1
|
|
#define GFS2_EATYPE_SYS 2
|
|
#define GFS2_EATYPE_SECURITY 3
|
|
|
|
#define GFS2_EATYPE_LAST 3
|
|
#define GFS2_EATYPE_VALID(x) ((x) <= GFS2_EATYPE_LAST)
|
|
|
|
#define GFS2_EAFLAG_LAST 0x01 /* last ea in block */
|
|
|
|
struct gfs2_ea_header {
|
|
__be32 ea_rec_len;
|
|
__be32 ea_data_len;
|
|
__u8 ea_name_len; /* no NULL pointer after the string */
|
|
__u8 ea_type; /* GFS2_EATYPE_... */
|
|
__u8 ea_flags; /* GFS2_EAFLAG_... */
|
|
__u8 ea_num_ptrs;
|
|
__u32 __pad;
|
|
};
|
|
|
|
/*
|
|
* Log header structure
|
|
*/
|
|
|
|
#define GFS2_LOG_HEAD_UNMOUNT 0x00000001 /* log is clean */
|
|
|
|
struct gfs2_log_header {
|
|
struct gfs2_meta_header lh_header;
|
|
|
|
__be64 lh_sequence; /* Sequence number of this transaction */
|
|
__be32 lh_flags; /* GFS2_LOG_HEAD_... */
|
|
__be32 lh_tail; /* Block number of log tail */
|
|
__be32 lh_blkno;
|
|
__be32 lh_hash;
|
|
};
|
|
|
|
/*
|
|
* Log type descriptor
|
|
*/
|
|
|
|
#define GFS2_LOG_DESC_METADATA 300
|
|
/* ld_data1 is the number of metadata blocks in the descriptor.
|
|
ld_data2 is unused. */
|
|
|
|
#define GFS2_LOG_DESC_REVOKE 301
|
|
/* ld_data1 is the number of revoke blocks in the descriptor.
|
|
ld_data2 is unused. */
|
|
|
|
#define GFS2_LOG_DESC_JDATA 302
|
|
/* ld_data1 is the number of data blocks in the descriptor.
|
|
ld_data2 is unused. */
|
|
|
|
struct gfs2_log_descriptor {
|
|
struct gfs2_meta_header ld_header;
|
|
|
|
__be32 ld_type; /* GFS2_LOG_DESC_... */
|
|
__be32 ld_length; /* Number of buffers in this chunk */
|
|
__be32 ld_data1; /* descriptor-specific field */
|
|
__be32 ld_data2; /* descriptor-specific field */
|
|
|
|
__u8 ld_reserved[32];
|
|
};
|
|
|
|
/*
|
|
* Inum Range
|
|
* Describe a range of formal inode numbers allocated to
|
|
* one machine to assign to inodes.
|
|
*/
|
|
|
|
#define GFS2_INUM_QUANTUM 1048576
|
|
|
|
struct gfs2_inum_range {
|
|
__be64 ir_start;
|
|
__be64 ir_length;
|
|
};
|
|
|
|
/*
|
|
* Statfs change
|
|
* Describes an change to the pool of free and allocated
|
|
* blocks.
|
|
*/
|
|
|
|
struct gfs2_statfs_change {
|
|
__be64 sc_total;
|
|
__be64 sc_free;
|
|
__be64 sc_dinodes;
|
|
};
|
|
|
|
/*
|
|
* Quota change
|
|
* Describes an allocation change for a particular
|
|
* user or group.
|
|
*/
|
|
|
|
#define GFS2_QCF_USER 0x00000001
|
|
|
|
struct gfs2_quota_change {
|
|
__be64 qc_change;
|
|
__be32 qc_flags; /* GFS2_QCF_... */
|
|
__be32 qc_id;
|
|
};
|
|
|
|
struct gfs2_quota_lvb {
|
|
__be32 qb_magic;
|
|
__u32 __pad;
|
|
__be64 qb_limit; /* Hard limit of # blocks to alloc */
|
|
__be64 qb_warn; /* Warn user when alloc is above this # */
|
|
__be64 qb_value; /* Current # blocks allocated */
|
|
};
|
|
|
|
#endif /* __GFS2_ONDISK_DOT_H__ */
|