--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * 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__
+
+#include <linux/types.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_FREEZE_LOCK 2
+#define GFS2_RENAME_LOCK 3
+#define GFS2_CONTROL_LOCK 4
+#define GFS2_MOUNTED_LOCK 5
+
+/* 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;
+ /* This union is to keep userspace happy */
+ union {
+ __be32 mh_jid; /* Was incarnation number in gfs1 */
+ __be32 __pad1;
+ };
+};
+
+/*
+ * 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
+#define GFS2_RGF_TRIMMED 0x00000010
+
+struct gfs2_rgrp_lvb {
+ __be32 rl_magic;
+ __be32 rl_flags;
+ __be32 rl_free;
+ __be32 rl_dinodes;
+ __be64 rl_igeneration;
+ __be32 rl_unlinked;
+ __be32 __pad;
+};
+
+struct gfs2_rgrp {
+ struct gfs2_meta_header rg_header;
+
+ __be32 rg_flags;
+ __be32 rg_free;
+ __be32 rg_dinodes;
+ union {
+ __be32 __pad;
+ __be32 rg_skip; /* Distance to the next rgrp in fs blocks */
+ };
+ __be64 rg_igeneration;
+ /* The following 3 fields are duplicated from gfs2_rindex to reduce
+ reliance on the rindex */
+ __be64 rg_data0; /* First data location */
+ __be32 rg_data; /* Number of data blocks in rgrp */
+ __be32 rg_bitbytes; /* Number of bytes in data bitmaps */
+ __be32 rg_crc; /* crc32 of the structure with this field 0 */
+
+ __u8 rg_reserved[60]; /* Several fields from gfs1 now reserved */
+};
+
+/*
+ * quota structure
+ */
+
+struct gfs2_quota {
+ __be64 qu_limit;
+ __be64 qu_warn;
+ __be64 qu_value;
+ __u8 qu_reserved[64];
+};
+
+/*
+ * 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_TopLevel = 10,
+ 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_TOPDIR 0x00000400 /* New in gfs2 */
+#define GFS2_DIF_TRUNC_IN_PROG 0x20000000 /* New in gfs2 */
+#define GFS2_DIF_INHERIT_DIRECTIO 0x40000000 /* only in gfs1 */
+#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)
+#define GFS2_MIN_DIRENT_SIZE (GFS2_DIRENT_SIZE(1))
+
+
+struct gfs2_dirent {
+ struct gfs2_inum de_inum;
+ __be32 de_hash;
+ __be16 de_rec_len;
+ __be16 de_name_len;
+ __be16 de_type;
+ __be16 de_rahead;
+ union {
+ __u8 __pad[12];
+ struct {
+ __u32 de_cookie; /* ondisk value not used */
+ __u8 pad3[8];
+ };
+ };
+};
+
+/*
+ * 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 */
+
+ union {
+ __u8 lf_reserved[64];
+ struct {
+ __be64 lf_inode; /* Dir inode number */
+ __be32 lf_dist; /* Dist from inode on chain */
+ __be32 lf_nsec; /* Last ins/del usecs */
+ __be64 lf_sec; /* Last ins/del in secs */
+ __u8 lf_reserved2[40];
+ };
+ };
+};
+
+/*
+ * Extended attribute header format
+ *
+ * This works in a similar way to dirents. There is a fixed size header
+ * followed by a variable length section made up of the name and the
+ * associated data. In the case of a "stuffed" entry, the value is
+ * __inline__ directly after the name, the ea_num_ptrs entry will be
+ * zero in that case. For non-"stuffed" entries, there will be
+ * a set of pointers (aligned to 8 byte boundary) to the block(s)
+ * containing the value.
+ *
+ * The blocks containing the values and the blocks containing the
+ * extended attribute headers themselves all start with the common
+ * metadata header. Each inode, if it has extended attributes, will
+ * have either a single block containing the extended attribute headers
+ * or a single indirect block pointing to blocks containing the
+ * extended attribute headers.
+ *
+ * The maximum size of the data part of an extended attribute is 64k
+ * so the number of blocks required depends upon block size. Since the
+ * block size also determines the number of pointers in an indirect
+ * block, its a fairly complicated calculation to work out the maximum
+ * number of blocks that an inode may have relating to extended attributes.
+ *
+ */
+
+#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 */
+#define GFS2_LOG_HEAD_FLUSH_NORMAL 0x00000002 /* normal log flush */
+#define GFS2_LOG_HEAD_FLUSH_SYNC 0x00000004 /* Sync log flush */
+#define GFS2_LOG_HEAD_FLUSH_SHUTDOWN 0x00000008 /* Shutdown log flush */
+#define GFS2_LOG_HEAD_FLUSH_FREEZE 0x00000010 /* Freeze flush */
+#define GFS2_LOG_HEAD_RECOVERY 0x00000020 /* Journal recovery */
+#define GFS2_LOG_HEAD_USERSPACE 0x80000000 /* Written by gfs2-utils */
+
+/* Log flush callers */
+#define GFS2_LFC_SHUTDOWN 0x00000100
+#define GFS2_LFC_JDATA_WPAGES 0x00000200
+#define GFS2_LFC_SET_FLAGS 0x00000400
+#define GFS2_LFC_AIL_EMPTY_GL 0x00000800
+#define GFS2_LFC_AIL_FLUSH 0x00001000
+#define GFS2_LFC_RGRP_GO_SYNC 0x00002000
+#define GFS2_LFC_INODE_GO_SYNC 0x00004000
+#define GFS2_LFC_INODE_GO_INVAL 0x00008000
+#define GFS2_LFC_FREEZE_GO_SYNC 0x00010000
+#define GFS2_LFC_KILL_SB 0x00020000
+#define GFS2_LFC_DO_SYNC 0x00040000
+#define GFS2_LFC_INPLACE_RESERVE 0x00080000
+#define GFS2_LFC_WRITE_INODE 0x00100000
+#define GFS2_LFC_MAKE_FS_RO 0x00200000
+#define GFS2_LFC_SYNC_FS 0x00400000
+#define GFS2_LFC_EVICT_INODE 0x00800000
+#define GFS2_LFC_TRANS_END 0x01000000
+#define GFS2_LFC_LOGD_JFLUSH_REQD 0x02000000
+#define GFS2_LFC_LOGD_AIL_FLUSH_REQD 0x04000000
+
+#define LH_V1_SIZE (offsetofend(struct gfs2_log_header, lh_hash))
+
+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; /* crc up to here with this field 0 */
+
+ /* Version 2 additional fields start here */
+ __be32 lh_crc; /* crc32c from lh_nsec to end of block */
+ __be32 lh_nsec; /* Nanoseconds of timestamp */
+ __be64 lh_sec; /* Seconds of timestamp */
+ __be64 lh_addr; /* Block addr of this log header (absolute) */
+ __be64 lh_jinode; /* Journal inode number */
+ __be64 lh_statfs_addr; /* Local statfs inode number */
+ __be64 lh_quota_addr; /* Local quota change inode number */
+
+ /* Statfs local changes (i.e. diff from global statfs) */
+ __be64 lh_local_total;
+ __be64 lh_local_free;
+ __be64 lh_local_dinodes;
+};
+
+/*
+ * 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__ */
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