---

---

---

001: /*
002:  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
003:  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
004:  *
005:  * This copyrighted material is made available to anyone wishing to use,
006:  * modify, copy, or redistribute it subject to the terms and conditions
007:  * of the GNU General Public License v.2.
008:  */
009: 
010: #ifndef __GFS2_ONDISK_DOT_H__
011: #define __GFS2_ONDISK_DOT_H__
012: 
013: #include <linux/types.h>
014: 
015: #define GFS2_MAGIC              0x01161970
016: #define GFS2_BASIC_BLOCK        512
017: #define GFS2_BASIC_BLOCK_SHIFT  9
018: 
019: /* Lock numbers of the LM_TYPE_NONDISK type */
020: 
021: #define GFS2_MOUNT_LOCK         0
022: #define GFS2_LIVE_LOCK          1
023: #define GFS2_TRANS_LOCK         2
024: #define GFS2_RENAME_LOCK        3
025: 
026: /* Format numbers for various metadata types */
027: 
028: #define GFS2_FORMAT_NONE        0
029: #define GFS2_FORMAT_SB          100
030: #define GFS2_FORMAT_RG          200
031: #define GFS2_FORMAT_RB          300
032: #define GFS2_FORMAT_DI          400
033: #define GFS2_FORMAT_IN          500
034: #define GFS2_FORMAT_LF          600
035: #define GFS2_FORMAT_JD          700
036: #define GFS2_FORMAT_LH          800
037: #define GFS2_FORMAT_LD          900
038: #define GFS2_FORMAT_LB          1000
039: #define GFS2_FORMAT_EA          1600
040: #define GFS2_FORMAT_ED          1700
041: #define GFS2_FORMAT_QC          1400
042: /* These are format numbers for entities contained in files */
043: #define GFS2_FORMAT_RI          1100
044: #define GFS2_FORMAT_DE          1200
045: #define GFS2_FORMAT_QU          1500
046: /* These are part of the superblock */
047: #define GFS2_FORMAT_FS          1801
048: #define GFS2_FORMAT_MULTI       1900
049: 
050: /*
051:  * An on-disk inode number
052:  */
053: 
054: struct gfs2_inum {
055:         __be64 no_formal_ino;
056:         __be64 no_addr;
057: };
058: 
059: /*
060:  * Generic metadata head structure
061:  * Every inplace buffer logged in the journal must start with this.
062:  */
063: 
064: #define GFS2_METATYPE_NONE      0
065: #define GFS2_METATYPE_SB        1
066: #define GFS2_METATYPE_RG        2
067: #define GFS2_METATYPE_RB        3
068: #define GFS2_METATYPE_DI        4
069: #define GFS2_METATYPE_IN        5
070: #define GFS2_METATYPE_LF        6
071: #define GFS2_METATYPE_JD        7
072: #define GFS2_METATYPE_LH        8
073: #define GFS2_METATYPE_LD        9
074: #define GFS2_METATYPE_LB        12
075: #define GFS2_METATYPE_EA        10
076: #define GFS2_METATYPE_ED        11
077: #define GFS2_METATYPE_QC        14
078: 
079: struct gfs2_meta_header {
080:         __be32 mh_magic;
081:         __be32 mh_type;
082:         __be64 __pad0;          /* Was generation number in gfs1 */
083:         __be32 mh_format;
084:         /* This union is to keep userspace happy */
085:         union {
086:                 __be32 mh_jid;          /* Was incarnation number in gfs1 */
087:                 __be32 __pad1;
088:         };
089: };
090: 
091: /*
092:  * super-block structure
093:  *
094:  * It's probably good if SIZEOF_SB <= GFS2_BASIC_BLOCK (512 bytes)
095:  *
096:  * Order is important, need to be able to read old superblocks to do on-disk
097:  * version upgrades.
098:  */
099: 
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: 

---

---

---