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