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TOMOYO Linux Cross Reference
Linux/include/linux/gfs2_ondisk.h

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  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 
 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
 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 
 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;
 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 
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];
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 
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
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 
170 struct 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 
186 struct 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 
203 enum {
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 
234 struct 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 
286 struct 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 
299 struct 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 
349 struct 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 
365 struct 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 
391 struct 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 
410 struct 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 
421 struct 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 
435 struct gfs2_quota_change {
436         __be64 qc_change;
437         __be32 qc_flags;        /* GFS2_QCF_... */
438         __be32 qc_id;
439 };
440 
441 struct 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__ */
450 

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