[mirror_ubuntu-zesty-kernel.git] / include / linux / gfs2_ondisk.h

/*
 * 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_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;
	/* 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

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
 *
 * 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 attribure headers.
 *
 * The maximim 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 */

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__ */
Commit	Line	Data
b3b94faa	1	/*
feaa7bba SW	2	* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
	3	* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
	4	*
	5	* This copyrighted material is made available to anyone wishing to use,
	6	* modify, copy, or redistribute it subject to the terms and conditions
	7	* of the GNU General Public License v.2.
	8	*/
b3b94faa DT	9
	10	#ifndef __GFS2_ONDISK_DOT_H__
	11	#define __GFS2_ONDISK_DOT_H__
	12
237416fe JSR	13	#include <linux/types.h>
237416fe JSR	14
b3b94faa DT	15	#define GFS2_MAGIC 0x01161970
	16	#define GFS2_BASIC_BLOCK 512
	17	#define GFS2_BASIC_BLOCK_SHIFT 9
	18
	19	/* Lock numbers of the LM_TYPE_NONDISK type */
	20
	21	#define GFS2_MOUNT_LOCK 0
	22	#define GFS2_LIVE_LOCK 1
	23	#define GFS2_TRANS_LOCK 2
	24	#define GFS2_RENAME_LOCK 3
	25
	26	/* Format numbers for various metadata types */
	27
	28	#define GFS2_FORMAT_NONE 0
	29	#define GFS2_FORMAT_SB 100
	30	#define GFS2_FORMAT_RG 200
	31	#define GFS2_FORMAT_RB 300
	32	#define GFS2_FORMAT_DI 400
	33	#define GFS2_FORMAT_IN 500
	34	#define GFS2_FORMAT_LF 600
	35	#define GFS2_FORMAT_JD 700
	36	#define GFS2_FORMAT_LH 800
	37	#define GFS2_FORMAT_LD 900
	38	#define GFS2_FORMAT_LB 1000
fc69d0d3 SW	39	#define GFS2_FORMAT_EA 1600
fc69d0d3 SW	40	#define GFS2_FORMAT_ED 1700
b3b94faa DT	41	#define GFS2_FORMAT_QC 1400
b3b94faa DT	42	/* These are format numbers for entities contained in files */
fc69d0d3 SW	43	#define GFS2_FORMAT_RI 1100
	44	#define GFS2_FORMAT_DE 1200
	45	#define GFS2_FORMAT_QU 1500
b3b94faa DT	46	/* These are part of the superblock */
	47	#define GFS2_FORMAT_FS 1801
	48	#define GFS2_FORMAT_MULTI 1900
	49
	50	/*
	51	* An on-disk inode number
	52	*/
	53
b3b94faa DT	54	struct gfs2_inum {
	55	__be64 no_formal_ino;
	56	__be64 no_addr;
	57	};
	58
	59	/*
	60	* Generic metadata head structure
	61	* Every inplace buffer logged in the journal must start with this.
	62	*/
	63
	64	#define GFS2_METATYPE_NONE 0
	65	#define GFS2_METATYPE_SB 1
	66	#define GFS2_METATYPE_RG 2
	67	#define GFS2_METATYPE_RB 3
	68	#define GFS2_METATYPE_DI 4
	69	#define GFS2_METATYPE_IN 5
	70	#define GFS2_METATYPE_LF 6
	71	#define GFS2_METATYPE_JD 7
	72	#define GFS2_METATYPE_LH 8
	73	#define GFS2_METATYPE_LD 9
fc69d0d3 SW	74	#define GFS2_METATYPE_LB 12
	75	#define GFS2_METATYPE_EA 10
	76	#define GFS2_METATYPE_ED 11
b3b94faa DT	77	#define GFS2_METATYPE_QC 14
	78
	79	struct gfs2_meta_header {
	80	__be32 mh_magic;
	81	__be32 mh_type;
	82	__be64 __pad0; /* Was generation number in gfs1 */
	83	__be32 mh_format;
0ab7d13f SW	84	/* This union is to keep userspace happy */
	85	union {
	86	__be32 mh_jid; /* Was incarnation number in gfs1 */
	87	__be32 __pad1;
	88	};
b3b94faa DT	89	};
	90
	91	/*
	92	* super-block structure
	93	*
	94	* It's probably good if SIZEOF_SB <= GFS2_BASIC_BLOCK (512 bytes)
	95	*
	96	* Order is important, need to be able to read old superblocks to do on-disk
	97	* version upgrades.
	98	*/
	99
	100	/* Address of superblock in GFS2 basic blocks */
	101	#define GFS2_SB_ADDR 128
	102
	103	/* The lock number for the superblock (must be zero) */
	104	#define GFS2_SB_LOCK 0
	105
	106	/* Requirement: GFS2_LOCKNAME_LEN % 8 == 0
	107	Includes: the fencing zero at the end */
	108	#define GFS2_LOCKNAME_LEN 64
	109
	110	struct gfs2_sb {
	111	struct gfs2_meta_header sb_header;
	112
	113	__be32 sb_fs_format;
	114	__be32 sb_multihost_format;
	115	__u32 __pad0; /* Was superblock flags in gfs1 */
	116
	117	__be32 sb_bsize;
	118	__be32 sb_bsize_shift;
	119	__u32 __pad1; /* Was journal segment size in gfs1 */
	120
	121	struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */
	122	struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */
	123	struct gfs2_inum sb_root_dir;
	124
	125	char sb_lockproto[GFS2_LOCKNAME_LEN];
	126	char sb_locktable[GFS2_LOCKNAME_LEN];
6d80c39f SW	127
	128	struct gfs2_inum __pad3; /* Was quota inode in gfs1 */
	129	struct gfs2_inum __pad4; /* Was licence inode in gfs1 */
	130	#define GFS2_HAS_UUID 1
	131	__u8 sb_uuid[16]; /* The UUID, maybe 0 for backwards compat */
b3b94faa DT	132	};
	133
	134	/*
	135	* resource index structure
	136	*/
	137
	138	struct gfs2_rindex {
	139	__be64 ri_addr; /* grp block disk address */
	140	__be32 ri_length; /* length of rgrp header in fs blocks */
	141	__u32 __pad;
	142
	143	__be64 ri_data0; /* first data location */
	144	__be32 ri_data; /* num of data blocks in rgrp */
	145
	146	__be32 ri_bitbytes; /* number of bytes in data bitmaps */
	147
	148	__u8 ri_reserved[64];
	149	};
	150
	151	/*
	152	* resource group header structure
	153	*/
	154
	155	/* Number of blocks per byte in rgrp */
	156	#define GFS2_NBBY 4
	157	#define GFS2_BIT_SIZE 2
	158	#define GFS2_BIT_MASK 0x00000003
	159
	160	#define GFS2_BLKST_FREE 0
	161	#define GFS2_BLKST_USED 1
feaa7bba	162	#define GFS2_BLKST_UNLINKED 2
b3b94faa DT	163	#define GFS2_BLKST_DINODE 3
	164
	165	#define GFS2_RGF_JOURNAL 0x00000001
	166	#define GFS2_RGF_METAONLY 0x00000002
	167	#define GFS2_RGF_DATAONLY 0x00000004
	168	#define GFS2_RGF_NOALLOC 0x00000008
	169
	170	struct gfs2_rgrp {
	171	struct gfs2_meta_header rg_header;
	172
	173	__be32 rg_flags;
	174	__be32 rg_free;
	175	__be32 rg_dinodes;
4340fe62 SW	176	__be32 __pad;
4340fe62 SW	177	__be64 rg_igeneration;
b3b94faa	178
4340fe62	179	__u8 rg_reserved[80]; /* Several fields from gfs1 now reserved */
b3b94faa DT	180	};
b3b94faa DT	181
2d9a4bbf AD	182	/*
	183	* quota linked list: user quotas and group quotas form two separate
	184	* singly linked lists. ll_next stores uids or gids of next quotas in the
	185	* linked list.
	186
	187	Given the uid/gid, how to calculate the quota file offsets for the corresponding
	188	gfs2_quota structures on disk:
	189
	190	for user quotas, given uid,
	191	offset = uid * sizeof(struct gfs2_quota);
	192
	193	for group quotas, given gid,
	194	offset = (gid * sizeof(struct gfs2_quota)) + sizeof(struct gfs2_quota);
	195
	196
	197	uid:0 gid:0 uid:12 gid:12 uid:17 gid:17 uid:5142 gid:5142
	198	+-------+-------+ +-------+-------+ +-------+- - - -+ +- - - -+-------+
	199	\| valid \| valid \| :: \| valid \| valid \| :: \| valid \| inval \| :: \| inval \| valid \|
	200	+-------+-------+ +-------+-------+ +-------+- - - -+ +- - - -+-------+
	201	next:12 next:12 next:17 next:5142 next:NULL next:NULL
	202	\| \| \| \| \|<-- user quota list \|
	203	\______\|___________/ \______\|___________/ group quota list -->\|
	204	\| \| \|
	205	\__________________/ \_______________________________________/
	206
	207	*/
	208
b3b94faa DT	209	/*
	210	* quota structure
	211	*/
	212
	213	struct gfs2_quota {
	214	__be64 qu_limit;
	215	__be64 qu_warn;
	216	__be64 qu_value;
2d9a4bbf AD	217	__be32 qu_ll_next; /* location of next quota in list */
2d9a4bbf AD	218	__u8 qu_reserved[60];
b3b94faa DT	219	};
	220
	221	/*
	222	* dinode structure
	223	*/
	224
	225	#define GFS2_MAX_META_HEIGHT 10
	226	#define GFS2_DIR_MAX_DEPTH 17
	227
	228	#define DT2IF(dt) (((dt) << 12) & S_IFMT)
	229	#define IF2DT(sif) (((sif) & S_IFMT) >> 12)
	230
7ea9ea83 SW	231	enum {
	232	gfs2fl_Jdata = 0,
	233	gfs2fl_ExHash = 1,
	234	gfs2fl_Unused = 2,
	235	gfs2fl_EaIndirect = 3,
	236	gfs2fl_Directio = 4,
	237	gfs2fl_Immutable = 5,
	238	gfs2fl_AppendOnly = 6,
	239	gfs2fl_NoAtime = 7,
	240	gfs2fl_Sync = 8,
	241	gfs2fl_System = 9,
	242	gfs2fl_TruncInProg = 29,
	243	gfs2fl_InheritDirectio = 30,
	244	gfs2fl_InheritJdata = 31,
	245	};
	246
b3b94faa DT	247	/* Dinode flags */
	248	#define GFS2_DIF_JDATA 0x00000001
	249	#define GFS2_DIF_EXHASH 0x00000002
	250	#define GFS2_DIF_UNUSED 0x00000004 /* only in gfs1 */
	251	#define GFS2_DIF_EA_INDIRECT 0x00000008
	252	#define GFS2_DIF_DIRECTIO 0x00000010
	253	#define GFS2_DIF_IMMUTABLE 0x00000020
	254	#define GFS2_DIF_APPENDONLY 0x00000040
	255	#define GFS2_DIF_NOATIME 0x00000080
	256	#define GFS2_DIF_SYNC 0x00000100
	257	#define GFS2_DIF_SYSTEM 0x00000200 /* New in gfs2 */
	258	#define GFS2_DIF_TRUNC_IN_PROG 0x20000000 /* New in gfs2 */
	259	#define GFS2_DIF_INHERIT_DIRECTIO 0x40000000
	260	#define GFS2_DIF_INHERIT_JDATA 0x80000000
	261
	262	struct gfs2_dinode {
	263	struct gfs2_meta_header di_header;
	264
	265	struct gfs2_inum di_num;
	266
	267	__be32 di_mode; /* mode of file */
	268	__be32 di_uid; /* owner's user id */
	269	__be32 di_gid; /* owner's group id */
	270	__be32 di_nlink; /* number of links to this file */
	271	__be64 di_size; /* number of bytes in file */
	272	__be64 di_blocks; /* number of blocks in file */
	273	__be64 di_atime; /* time last accessed */
	274	__be64 di_mtime; /* time last modified */
	275	__be64 di_ctime; /* time last changed */
	276	__be32 di_major; /* device major number */
	277	__be32 di_minor; /* device minor number */
	278
	279	/* This section varies from gfs1. Padding added to align with
	280	* remainder of dinode
	281	*/
	282	__be64 di_goal_meta; /* rgrp to alloc from next */
	283	__be64 di_goal_data; /* data block goal */
4340fe62	284	__be64 di_generation; /* generation number for NFS */
b3b94faa DT	285
	286	__be32 di_flags; /* GFS2_DIF_... */
	287	__be32 di_payload_format; /* GFS2_FORMAT_... */
	288	__u16 __pad1; /* Was ditype in gfs1 */
	289	__be16 di_height; /* height of metadata */
	290	__u32 __pad2; /* Unused incarnation number from gfs1 */
	291
	292	/* These only apply to directories */
	293	__u16 __pad3; /* Padding */
	294	__be16 di_depth; /* Number of bits in the table */
	295	__be32 di_entries; /* The number of entries in the directory */
	296
	297	struct gfs2_inum __pad4; /* Unused even in current gfs1 */
	298
	299	__be64 di_eattr; /* extended attribute block number */
4bd91ba1 SW	300	__be32 di_atime_nsec; /* nsec portion of atime */
	301	__be32 di_mtime_nsec; /* nsec portion of mtime */
	302	__be32 di_ctime_nsec; /* nsec portion of ctime */
b3b94faa	303
4bd91ba1	304	__u8 di_reserved[44];
b3b94faa DT	305	};
	306
	307	/*
	308	* directory structure - many of these per directory file
	309	*/
	310
	311	#define GFS2_FNAMESIZE 255
	312	#define GFS2_DIRENT_SIZE(name_len) ((sizeof(struct gfs2_dirent) + (name_len) + 7) & ~7)
	313
	314	struct gfs2_dirent {
	315	struct gfs2_inum de_inum;
	316	__be32 de_hash;
fc69d0d3 SW	317	__be16 de_rec_len;
	318	__be16 de_name_len;
	319	__be16 de_type;
	320	__u8 __pad[14];
b3b94faa DT	321	};
	322
	323	/*
	324	* Header of leaf directory nodes
	325	*/
	326
	327	struct gfs2_leaf {
	328	struct gfs2_meta_header lf_header;
	329
	330	__be16 lf_depth; /* Depth of leaf */
	331	__be16 lf_entries; /* Number of dirents in leaf */
	332	__be32 lf_dirent_format; /* Format of the dirents */
	333	__be64 lf_next; /* Next leaf, if overflow */
	334
fc69d0d3	335	__u8 lf_reserved[64];
b3b94faa DT	336	};
	337
	338	/*
	339	* Extended attribute header format
b6ed2e03 SW	340	*
	341	* This works in a similar way to dirents. There is a fixed size header
	342	* followed by a variable length section made up of the name and the
	343	* associated data. In the case of a "stuffed" entry, the value is
	344	* inline directly after the name, the ea_num_ptrs entry will be
	345	* zero in that case. For non-"stuffed" entries, there will be
	346	* a set of pointers (aligned to 8 byte boundary) to the block(s)
	347	* containing the value.
	348	*
	349	* The blocks containing the values and the blocks containing the
	350	* extended attribute headers themselves all start with the common
	351	* metadata header. Each inode, if it has extended attributes, will
	352	* have either a single block containing the extended attribute headers
	353	* or a single indirect block pointing to blocks containing the
	354	* extended attribure headers.
	355	*
	356	* The maximim size of the data part of an extended attribute is 64k
	357	* so the number of blocks required depends upon block size. Since the
	358	* block size also determines the number of pointers in an indirect
	359	* block, its a fairly complicated calculation to work out the maximum
	360	* number of blocks that an inode may have relating to extended attributes.
	361	*
b3b94faa DT	362	*/
	363
	364	#define GFS2_EA_MAX_NAME_LEN 255
	365	#define GFS2_EA_MAX_DATA_LEN 65536
	366
	367	#define GFS2_EATYPE_UNUSED 0
	368	#define GFS2_EATYPE_USR 1
	369	#define GFS2_EATYPE_SYS 2
639b6d79	370	#define GFS2_EATYPE_SECURITY 3
b3b94faa	371
639b6d79	372	#define GFS2_EATYPE_LAST 3
b3b94faa DT	373	#define GFS2_EATYPE_VALID(x) ((x) <= GFS2_EATYPE_LAST)
	374
	375	#define GFS2_EAFLAG_LAST 0x01 /* last ea in block */
	376
	377	struct gfs2_ea_header {
	378	__be32 ea_rec_len;
	379	__be32 ea_data_len;
	380	__u8 ea_name_len; /* no NULL pointer after the string */
	381	__u8 ea_type; /* GFS2_EATYPE_... */
	382	__u8 ea_flags; /* GFS2_EAFLAG_... */
	383	__u8 ea_num_ptrs;
	384	__u32 __pad;
	385	};
	386
	387	/*
	388	* Log header structure
	389	*/
	390
	391	#define GFS2_LOG_HEAD_UNMOUNT 0x00000001 /* log is clean */
	392
	393	struct gfs2_log_header {
	394	struct gfs2_meta_header lh_header;
	395
	396	__be64 lh_sequence; /* Sequence number of this transaction */
	397	__be32 lh_flags; /* GFS2_LOG_HEAD_... */
	398	__be32 lh_tail; /* Block number of log tail */
	399	__be32 lh_blkno;
	400	__be32 lh_hash;
	401	};
	402
	403	/*
	404	* Log type descriptor
	405	*/
	406
	407	#define GFS2_LOG_DESC_METADATA 300
	408	/* ld_data1 is the number of metadata blocks in the descriptor.
	409	ld_data2 is unused. */
	410
	411	#define GFS2_LOG_DESC_REVOKE 301
	412	/* ld_data1 is the number of revoke blocks in the descriptor.
	413	ld_data2 is unused. */
	414
18ec7d5c SW	415	#define GFS2_LOG_DESC_JDATA 302
	416	/* ld_data1 is the number of data blocks in the descriptor.
	417	ld_data2 is unused. */
	418
b3b94faa DT	419	struct gfs2_log_descriptor {
	420	struct gfs2_meta_header ld_header;
	421
	422	__be32 ld_type; /* GFS2_LOG_DESC_... */
	423	__be32 ld_length; /* Number of buffers in this chunk */
	424	__be32 ld_data1; /* descriptor-specific field */
	425	__be32 ld_data2; /* descriptor-specific field */
	426
	427	__u8 ld_reserved[32];
	428	};
	429
	430	/*
	431	* Inum Range
	432	* Describe a range of formal inode numbers allocated to
	433	* one machine to assign to inodes.
	434	*/
	435
	436	#define GFS2_INUM_QUANTUM 1048576
	437
	438	struct gfs2_inum_range {
	439	__be64 ir_start;
	440	__be64 ir_length;
	441	};
	442
	443	/*
	444	* Statfs change
	445	* Describes an change to the pool of free and allocated
	446	* blocks.
	447	*/
	448
	449	struct gfs2_statfs_change {
	450	__be64 sc_total;
	451	__be64 sc_free;
	452	__be64 sc_dinodes;
	453	};
	454
b3b94faa DT	455	/*
	456	* Quota change
	457	* Describes an allocation change for a particular
	458	* user or group.
	459	*/
	460
	461	#define GFS2_QCF_USER 0x00000001
	462
	463	struct gfs2_quota_change {
	464	__be64 qc_change;
	465	__be32 qc_flags; /* GFS2_QCF_... */
	466	__be32 qc_id;
	467	};
	468
2a87ab08 AD	469	struct gfs2_quota_lvb {
2a87ab08 AD	470	__be32 qb_magic;
518bbde3	471	__u32 __pad;
2a87ab08 AD	472	__be64 qb_limit; /* Hard limit of # blocks to alloc */
	473	__be64 qb_warn; /* Warn user when alloc is above this # */
	474	__be64 qb_value; /* Current # blocks allocated */
	475	};
	476
b3b94faa	477	#endif /* __GFS2_ONDISK_DOT_H__ */