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/include/linux/gfs2_ondisk.h

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35
C++ Header | 449 lines | 257 code | 84 blank | 108 comment | 0 complexity | 2fd600ab15c8b0f31eed445bdab0571c MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  1/*
  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 */
  9
 10#ifndef __GFS2_ONDISK_DOT_H__
 11#define __GFS2_ONDISK_DOT_H__
 12
 13#include <linux/types.h>
 14
 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
 39#define GFS2_FORMAT_EA		1600
 40#define GFS2_FORMAT_ED		1700
 41#define GFS2_FORMAT_QC		1400
 42/* These are format numbers for entities contained in files */
 43#define GFS2_FORMAT_RI		1100
 44#define GFS2_FORMAT_DE		1200
 45#define GFS2_FORMAT_QU		1500
 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
 54struct 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
 74#define GFS2_METATYPE_LB	12
 75#define GFS2_METATYPE_EA	10
 76#define GFS2_METATYPE_ED	11
 77#define GFS2_METATYPE_QC	14
 78
 79struct gfs2_meta_header {
 80	__be32 mh_magic;
 81	__be32 mh_type;
 82	__be64 __pad0;		/* Was generation number in gfs1 */
 83	__be32 mh_format;
 84	/* This union is to keep userspace happy */
 85	union {
 86		__be32 mh_jid;		/* Was incarnation number in gfs1 */
 87		__be32 __pad1;
 88	};
 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
110struct 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];
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 */
132};
133
134/*
135 * resource index structure
136 */
137
138struct 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
162#define GFS2_BLKST_UNLINKED	2
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
170struct gfs2_rgrp {
171	struct gfs2_meta_header rg_header;
172
173	__be32 rg_flags;
174	__be32 rg_free;
175	__be32 rg_dinodes;
176	__be32 __pad;
177	__be64 rg_igeneration;
178
179	__u8 rg_reserved[80]; /* Several fields from gfs1 now reserved */
180};
181
182/*
183 * quota structure
184 */
185
186struct gfs2_quota {
187	__be64 qu_limit;
188	__be64 qu_warn;
189	__be64 qu_value;
190	__u8 qu_reserved[64];
191};
192
193/*
194 * dinode structure
195 */
196
197#define GFS2_MAX_META_HEIGHT	10
198#define GFS2_DIR_MAX_DEPTH	17
199
200#define DT2IF(dt) (((dt) << 12) & S_IFMT)
201#define IF2DT(sif) (((sif) & S_IFMT) >> 12)
202
203enum {
204	gfs2fl_Jdata		= 0,
205	gfs2fl_ExHash		= 1,
206	gfs2fl_Unused		= 2,
207	gfs2fl_EaIndirect	= 3,
208	gfs2fl_Directio		= 4,
209	gfs2fl_Immutable	= 5,
210	gfs2fl_AppendOnly	= 6,
211	gfs2fl_NoAtime		= 7,
212	gfs2fl_Sync		= 8,
213	gfs2fl_System		= 9,
214	gfs2fl_TruncInProg	= 29,
215	gfs2fl_InheritDirectio	= 30,
216	gfs2fl_InheritJdata	= 31,
217};
218
219/* Dinode flags */
220#define GFS2_DIF_JDATA			0x00000001
221#define GFS2_DIF_EXHASH			0x00000002
222#define GFS2_DIF_UNUSED			0x00000004  /* only in gfs1 */
223#define GFS2_DIF_EA_INDIRECT		0x00000008
224#define GFS2_DIF_DIRECTIO		0x00000010
225#define GFS2_DIF_IMMUTABLE		0x00000020
226#define GFS2_DIF_APPENDONLY		0x00000040
227#define GFS2_DIF_NOATIME		0x00000080
228#define GFS2_DIF_SYNC			0x00000100
229#define GFS2_DIF_SYSTEM			0x00000200 /* New in gfs2 */
230#define GFS2_DIF_TRUNC_IN_PROG		0x20000000 /* New in gfs2 */
231#define GFS2_DIF_INHERIT_DIRECTIO	0x40000000
232#define GFS2_DIF_INHERIT_JDATA		0x80000000
233
234struct gfs2_dinode {
235	struct gfs2_meta_header di_header;
236
237	struct gfs2_inum di_num;
238
239	__be32 di_mode;	/* mode of file */
240	__be32 di_uid;	/* owner's user id */
241	__be32 di_gid;	/* owner's group id */
242	__be32 di_nlink;	/* number of links to this file */
243	__be64 di_size;	/* number of bytes in file */
244	__be64 di_blocks;	/* number of blocks in file */
245	__be64 di_atime;	/* time last accessed */
246	__be64 di_mtime;	/* time last modified */
247	__be64 di_ctime;	/* time last changed */
248	__be32 di_major;	/* device major number */
249	__be32 di_minor;	/* device minor number */
250
251	/* This section varies from gfs1. Padding added to align with
252         * remainder of dinode
253	 */
254	__be64 di_goal_meta;	/* rgrp to alloc from next */
255	__be64 di_goal_data;	/* data block goal */
256	__be64 di_generation;	/* generation number for NFS */
257
258	__be32 di_flags;	/* GFS2_DIF_... */
259	__be32 di_payload_format;  /* GFS2_FORMAT_... */
260	__u16 __pad1;	/* Was ditype in gfs1 */
261	__be16 di_height;	/* height of metadata */
262	__u32 __pad2;	/* Unused incarnation number from gfs1 */
263
264	/* These only apply to directories  */
265	__u16 __pad3;	/* Padding */
266	__be16 di_depth;	/* Number of bits in the table */
267	__be32 di_entries;	/* The number of entries in the directory */
268
269	struct gfs2_inum __pad4; /* Unused even in current gfs1 */
270
271	__be64 di_eattr;	/* extended attribute block number */
272	__be32 di_atime_nsec;   /* nsec portion of atime */
273	__be32 di_mtime_nsec;   /* nsec portion of mtime */
274	__be32 di_ctime_nsec;   /* nsec portion of ctime */
275
276	__u8 di_reserved[44];
277};
278
279/*
280 * directory structure - many of these per directory file
281 */
282
283#define GFS2_FNAMESIZE		255
284#define GFS2_DIRENT_SIZE(name_len) ((sizeof(struct gfs2_dirent) + (name_len) + 7) & ~7)
285
286struct gfs2_dirent {
287	struct gfs2_inum de_inum;
288	__be32 de_hash;
289	__be16 de_rec_len;
290	__be16 de_name_len;
291	__be16 de_type;
292	__u8 __pad[14];
293};
294
295/*
296 * Header of leaf directory nodes
297 */
298
299struct gfs2_leaf {
300	struct gfs2_meta_header lf_header;
301
302	__be16 lf_depth;		/* Depth of leaf */
303	__be16 lf_entries;		/* Number of dirents in leaf */
304	__be32 lf_dirent_format;	/* Format of the dirents */
305	__be64 lf_next;			/* Next leaf, if overflow */
306
307	__u8 lf_reserved[64];
308};
309
310/*
311 * Extended attribute header format
312 *
313 * This works in a similar way to dirents. There is a fixed size header
314 * followed by a variable length section made up of the name and the
315 * associated data. In the case of a "stuffed" entry, the value is
316 * inline directly after the name, the ea_num_ptrs entry will be
317 * zero in that case. For non-"stuffed" entries, there will be
318 * a set of pointers (aligned to 8 byte boundary) to the block(s)
319 * containing the value.
320 *
321 * The blocks containing the values and the blocks containing the
322 * extended attribute headers themselves all start with the common
323 * metadata header. Each inode, if it has extended attributes, will
324 * have either a single block containing the extended attribute headers
325 * or a single indirect block pointing to blocks containing the
326 * extended attribure headers.
327 *
328 * The maximim size of the data part of an extended attribute is 64k
329 * so the number of blocks required depends upon block size. Since the
330 * block size also determines the number of pointers in an indirect
331 * block, its a fairly complicated calculation to work out the maximum
332 * number of blocks that an inode may have relating to extended attributes.
333 *
334 */
335
336#define GFS2_EA_MAX_NAME_LEN	255
337#define GFS2_EA_MAX_DATA_LEN	65536
338
339#define GFS2_EATYPE_UNUSED	0
340#define GFS2_EATYPE_USR		1
341#define GFS2_EATYPE_SYS		2
342#define GFS2_EATYPE_SECURITY	3
343
344#define GFS2_EATYPE_LAST	3
345#define GFS2_EATYPE_VALID(x)	((x) <= GFS2_EATYPE_LAST)
346
347#define GFS2_EAFLAG_LAST	0x01	/* last ea in block */
348
349struct gfs2_ea_header {
350	__be32 ea_rec_len;
351	__be32 ea_data_len;
352	__u8 ea_name_len;	/* no NULL pointer after the string */
353	__u8 ea_type;		/* GFS2_EATYPE_... */
354	__u8 ea_flags;		/* GFS2_EAFLAG_... */
355	__u8 ea_num_ptrs;
356	__u32 __pad;
357};
358
359/*
360 * Log header structure
361 */
362
363#define GFS2_LOG_HEAD_UNMOUNT	0x00000001	/* log is clean */
364
365struct gfs2_log_header {
366	struct gfs2_meta_header lh_header;
367
368	__be64 lh_sequence;	/* Sequence number of this transaction */
369	__be32 lh_flags;	/* GFS2_LOG_HEAD_... */
370	__be32 lh_tail;		/* Block number of log tail */
371	__be32 lh_blkno;
372	__be32 lh_hash;
373};
374
375/*
376 * Log type descriptor
377 */
378
379#define GFS2_LOG_DESC_METADATA	300
380/* ld_data1 is the number of metadata blocks in the descriptor.
381   ld_data2 is unused. */
382
383#define GFS2_LOG_DESC_REVOKE	301
384/* ld_data1 is the number of revoke blocks in the descriptor.
385   ld_data2 is unused. */
386
387#define GFS2_LOG_DESC_JDATA	302
388/* ld_data1 is the number of data blocks in the descriptor.
389   ld_data2 is unused. */
390
391struct gfs2_log_descriptor {
392	struct gfs2_meta_header ld_header;
393
394	__be32 ld_type;		/* GFS2_LOG_DESC_... */
395	__be32 ld_length;	/* Number of buffers in this chunk */
396	__be32 ld_data1;	/* descriptor-specific field */
397	__be32 ld_data2;	/* descriptor-specific field */
398
399	__u8 ld_reserved[32];
400};
401
402/*
403 * Inum Range
404 * Describe a range of formal inode numbers allocated to
405 * one machine to assign to inodes.
406 */
407
408#define GFS2_INUM_QUANTUM	1048576
409
410struct gfs2_inum_range {
411	__be64 ir_start;
412	__be64 ir_length;
413};
414
415/*
416 * Statfs change
417 * Describes an change to the pool of free and allocated
418 * blocks.
419 */
420
421struct gfs2_statfs_change {
422	__be64 sc_total;
423	__be64 sc_free;
424	__be64 sc_dinodes;
425};
426
427/*
428 * Quota change
429 * Describes an allocation change for a particular
430 * user or group.
431 */
432
433#define GFS2_QCF_USER		0x00000001
434
435struct gfs2_quota_change {
436	__be64 qc_change;
437	__be32 qc_flags;	/* GFS2_QCF_... */
438	__be32 qc_id;
439};
440
441struct gfs2_quota_lvb {
442        __be32 qb_magic;
443        __u32 __pad;
444        __be64 qb_limit;      /* Hard limit of # blocks to alloc */
445        __be64 qb_warn;       /* Warn user when alloc is above this # */
446        __be64 qb_value;       /* Current # blocks allocated */
447};
448
449#endif /* __GFS2_ONDISK_DOT_H__ */