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 /* 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      1802
 #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_inode_lvb {
     __be32 ri_magic;
     __be32 __pad;
     __be64 ri_generation_deleted;
 };
 
 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_TRUSTED 4
 
 #define GFS2_EATYPE_LAST    4
 #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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