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ocfs2: fix locking for res->tracking and dlm->tracking_list
[linux/fpc-iii.git] / fs / ocfs2 / ocfs2_fs.h
blob540ab5b75dbb057b99f5d879edb703c4b18afe9c
1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * ocfs2_fs.h
5 *
6 * On-disk structures for OCFS2.
7 *
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License, version 2, as published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public
20 * License along with this program; if not, write to the
21 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
22 * Boston, MA 021110-1307, USA.
23 */
24
25 #ifndef _OCFS2_FS_H
26 #define _OCFS2_FS_H
27
28 /* Version */
29 #define OCFS2_MAJOR_REV_LEVEL 0
30 #define OCFS2_MINOR_REV_LEVEL 90
31
32 /*
33 * An OCFS2 volume starts this way:
34 * Sector 0: Valid ocfs1_vol_disk_hdr that cleanly fails to mount OCFS.
35 * Sector 1: Valid ocfs1_vol_label that cleanly fails to mount OCFS.
36 * Block OCFS2_SUPER_BLOCK_BLKNO: OCFS2 superblock.
37 *
38 * All other structures are found from the superblock information.
39 *
40 * OCFS2_SUPER_BLOCK_BLKNO is in blocks, not sectors. eg, for a
41 * blocksize of 2K, it is 4096 bytes into disk.
42 */
43 #define OCFS2_SUPER_BLOCK_BLKNO 2
44
45 /*
46 * Cluster size limits. The maximum is kept arbitrarily at 1 MB, and could
47 * grow if needed.
48 */
49 #define OCFS2_MIN_CLUSTERSIZE 4096
50 #define OCFS2_MAX_CLUSTERSIZE 1048576
51
52 /*
53 * Blocks cannot be bigger than clusters, so the maximum blocksize is the
54 * minimum cluster size.
55 */
56 #define OCFS2_MIN_BLOCKSIZE 512
57 #define OCFS2_MAX_BLOCKSIZE OCFS2_MIN_CLUSTERSIZE
58
59 /* Filesystem magic number */
60 #define OCFS2_SUPER_MAGIC 0x7461636f
61
62 /* Object signatures */
63 #define OCFS2_SUPER_BLOCK_SIGNATURE "OCFSV2"
64 #define OCFS2_INODE_SIGNATURE "INODE01"
65 #define OCFS2_EXTENT_BLOCK_SIGNATURE "EXBLK01"
66 #define OCFS2_GROUP_DESC_SIGNATURE "GROUP01"
67 #define OCFS2_XATTR_BLOCK_SIGNATURE "XATTR01"
68 #define OCFS2_DIR_TRAILER_SIGNATURE "DIRTRL1"
69 #define OCFS2_DX_ROOT_SIGNATURE "DXDIR01"
70 #define OCFS2_DX_LEAF_SIGNATURE "DXLEAF1"
71 #define OCFS2_REFCOUNT_BLOCK_SIGNATURE "REFCNT1"
72
73 /* Compatibility flags */
74 #define OCFS2_HAS_COMPAT_FEATURE(sb,mask) \
75 ( OCFS2_SB(sb)->s_feature_compat & (mask) )
76 #define OCFS2_HAS_RO_COMPAT_FEATURE(sb,mask) \
77 ( OCFS2_SB(sb)->s_feature_ro_compat & (mask) )
78 #define OCFS2_HAS_INCOMPAT_FEATURE(sb,mask) \
79 ( OCFS2_SB(sb)->s_feature_incompat & (mask) )
80 #define OCFS2_SET_COMPAT_FEATURE(sb,mask) \
81 OCFS2_SB(sb)->s_feature_compat |= (mask)
82 #define OCFS2_SET_RO_COMPAT_FEATURE(sb,mask) \
83 OCFS2_SB(sb)->s_feature_ro_compat |= (mask)
84 #define OCFS2_SET_INCOMPAT_FEATURE(sb,mask) \
85 OCFS2_SB(sb)->s_feature_incompat |= (mask)
86 #define OCFS2_CLEAR_COMPAT_FEATURE(sb,mask) \
87 OCFS2_SB(sb)->s_feature_compat &= ~(mask)
88 #define OCFS2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
89 OCFS2_SB(sb)->s_feature_ro_compat &= ~(mask)
90 #define OCFS2_CLEAR_INCOMPAT_FEATURE(sb,mask) \
91 OCFS2_SB(sb)->s_feature_incompat &= ~(mask)
92
93 #define OCFS2_FEATURE_COMPAT_SUPP (OCFS2_FEATURE_COMPAT_BACKUP_SB \
94 | OCFS2_FEATURE_COMPAT_JBD2_SB)
95 #define OCFS2_FEATURE_INCOMPAT_SUPP (OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT \
96 | OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC \
97 | OCFS2_FEATURE_INCOMPAT_INLINE_DATA \
98 | OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP \
99 | OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK \
100 | OCFS2_FEATURE_INCOMPAT_XATTR \
101 | OCFS2_FEATURE_INCOMPAT_META_ECC \
102 | OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS \
103 | OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE \
104 | OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG \
105 | OCFS2_FEATURE_INCOMPAT_CLUSTERINFO \
106 | OCFS2_FEATURE_INCOMPAT_APPEND_DIO)
107 #define OCFS2_FEATURE_RO_COMPAT_SUPP (OCFS2_FEATURE_RO_COMPAT_UNWRITTEN \
108 | OCFS2_FEATURE_RO_COMPAT_USRQUOTA \
109 | OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
110
111 /*
112 * Heartbeat-only devices are missing journals and other files. The
113 * filesystem driver can't load them, but the library can. Never put
114 * this in OCFS2_FEATURE_INCOMPAT_SUPP, *ever*.
115 */
116 #define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV 0x0002
117
118 /*
119 * tunefs sets this incompat flag before starting the resize and clears it
120 * at the end. This flag protects users from inadvertently mounting the fs
121 * after an aborted run without fsck-ing.
122 */
123 #define OCFS2_FEATURE_INCOMPAT_RESIZE_INPROG 0x0004
124
125 /* Used to denote a non-clustered volume */
126 #define OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT 0x0008
127
128 /* Support for sparse allocation in b-trees */
129 #define OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC 0x0010
130
131 /*
132 * Tunefs sets this incompat flag before starting an operation which
133 * would require cleanup on abort. This is done to protect users from
134 * inadvertently mounting the fs after an aborted run without
135 * fsck-ing.
136 *
137 * s_tunefs_flags on the super block describes precisely which
138 * operations were in progress.
139 */
140 #define OCFS2_FEATURE_INCOMPAT_TUNEFS_INPROG 0x0020
141
142 /* Support for data packed into inode blocks */
143 #define OCFS2_FEATURE_INCOMPAT_INLINE_DATA 0x0040
144
145 /*
146 * Support for alternate, userspace cluster stacks. If set, the superblock
147 * field s_cluster_info contains a tag for the alternate stack in use as
148 * well as the name of the cluster being joined.
149 * mount.ocfs2 must pass in a matching stack name.
150 *
151 * If not set, the classic stack will be used. This is compatbile with
152 * all older versions.
153 */
154 #define OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK 0x0080
155
156 /* Support for the extended slot map */
157 #define OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP 0x100
158
159 /* Support for extended attributes */
160 #define OCFS2_FEATURE_INCOMPAT_XATTR 0x0200
161
162 /* Support for indexed directores */
163 #define OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS 0x0400
164
165 /* Metadata checksum and error correction */
166 #define OCFS2_FEATURE_INCOMPAT_META_ECC 0x0800
167
168 /* Refcount tree support */
169 #define OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE 0x1000
170
171 /* Discontiguous block groups */
172 #define OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG 0x2000
173
174 /*
175 * Incompat bit to indicate useable clusterinfo with stackflags for all
176 * cluster stacks (userspace adnd o2cb). If this bit is set,
177 * INCOMPAT_USERSPACE_STACK becomes superfluous and thus should not be set.
178 */
179 #define OCFS2_FEATURE_INCOMPAT_CLUSTERINFO 0x4000
180
181 /*
182 * Append Direct IO support
183 */
184 #define OCFS2_FEATURE_INCOMPAT_APPEND_DIO 0x8000
185
186 /*
187 * backup superblock flag is used to indicate that this volume
188 * has backup superblocks.
189 */
190 #define OCFS2_FEATURE_COMPAT_BACKUP_SB 0x0001
191
192 /*
193 * The filesystem will correctly handle journal feature bits.
194 */
195 #define OCFS2_FEATURE_COMPAT_JBD2_SB 0x0002
196
197 /*
198 * Unwritten extents support.
199 */
200 #define OCFS2_FEATURE_RO_COMPAT_UNWRITTEN 0x0001
201
202 /*
203 * Maintain quota information for this filesystem
204 */
205 #define OCFS2_FEATURE_RO_COMPAT_USRQUOTA 0x0002
206 #define OCFS2_FEATURE_RO_COMPAT_GRPQUOTA 0x0004
207
208
209 /* The byte offset of the first backup block will be 1G.
210 * The following will be 4G, 16G, 64G, 256G and 1T.
211 */
212 #define OCFS2_BACKUP_SB_START 1 << 30
213
214 /* the max backup superblock nums */
215 #define OCFS2_MAX_BACKUP_SUPERBLOCKS 6
216
217 /*
218 * Flags on ocfs2_super_block.s_tunefs_flags
219 */
220 #define OCFS2_TUNEFS_INPROG_REMOVE_SLOT 0x0001 /* Removing slots */
221
222 /*
223 * Flags on ocfs2_dinode.i_flags
224 */
225 #define OCFS2_VALID_FL (0x00000001) /* Inode is valid */
226 #define OCFS2_UNUSED2_FL (0x00000002)
227 #define OCFS2_ORPHANED_FL (0x00000004) /* On the orphan list */
228 #define OCFS2_UNUSED3_FL (0x00000008)
229 /* System inode flags */
230 #define OCFS2_SYSTEM_FL (0x00000010) /* System inode */
231 #define OCFS2_SUPER_BLOCK_FL (0x00000020) /* Super block */
232 #define OCFS2_LOCAL_ALLOC_FL (0x00000040) /* Slot local alloc bitmap */
233 #define OCFS2_BITMAP_FL (0x00000080) /* Allocation bitmap */
234 #define OCFS2_JOURNAL_FL (0x00000100) /* Slot local journal */
235 #define OCFS2_HEARTBEAT_FL (0x00000200) /* Heartbeat area */
236 #define OCFS2_CHAIN_FL (0x00000400) /* Chain allocator */
237 #define OCFS2_DEALLOC_FL (0x00000800) /* Truncate log */
238 #define OCFS2_QUOTA_FL (0x00001000) /* Quota file */
239 #define OCFS2_DIO_ORPHANED_FL (0X00002000) /* On the orphan list especially
240 * for dio */
241
242 /*
243 * Flags on ocfs2_dinode.i_dyn_features
244 *
245 * These can change much more often than i_flags. When adding flags,
246 * keep in mind that i_dyn_features is only 16 bits wide.
247 */
248 #define OCFS2_INLINE_DATA_FL (0x0001) /* Data stored in inode block */
249 #define OCFS2_HAS_XATTR_FL (0x0002)
250 #define OCFS2_INLINE_XATTR_FL (0x0004)
251 #define OCFS2_INDEXED_DIR_FL (0x0008)
252 #define OCFS2_HAS_REFCOUNT_FL (0x0010)
253
254 /* Inode attributes, keep in sync with EXT2 */
255 #define OCFS2_SECRM_FL FS_SECRM_FL /* Secure deletion */
256 #define OCFS2_UNRM_FL FS_UNRM_FL /* Undelete */
257 #define OCFS2_COMPR_FL FS_COMPR_FL /* Compress file */
258 #define OCFS2_SYNC_FL FS_SYNC_FL /* Synchronous updates */
259 #define OCFS2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */
260 #define OCFS2_APPEND_FL FS_APPEND_FL /* writes to file may only append */
261 #define OCFS2_NODUMP_FL FS_NODUMP_FL /* do not dump file */
262 #define OCFS2_NOATIME_FL FS_NOATIME_FL /* do not update atime */
263 /* Reserved for compression usage... */
264 #define OCFS2_DIRTY_FL FS_DIRTY_FL
265 #define OCFS2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */
266 #define OCFS2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */
267 #define OCFS2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */
268 /* End compression flags --- maybe not all used */
269 #define OCFS2_BTREE_FL FS_BTREE_FL /* btree format dir */
270 #define OCFS2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */
271 #define OCFS2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */
272 #define OCFS2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */
273 #define OCFS2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */
274 #define OCFS2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */
275 #define OCFS2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/
276 #define OCFS2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */
277
278 #define OCFS2_FL_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */
279 #define OCFS2_FL_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */
280
281 /*
282 * Extent record flags (e_node.leaf.flags)
283 */
284 #define OCFS2_EXT_UNWRITTEN (0x01) /* Extent is allocated but
285 * unwritten */
286 #define OCFS2_EXT_REFCOUNTED (0x02) /* Extent is reference
287 * counted in an associated
288 * refcount tree */
289
290 /*
291 * Journal Flags (ocfs2_dinode.id1.journal1.i_flags)
292 */
293 #define OCFS2_JOURNAL_DIRTY_FL (0x00000001) /* Journal needs recovery */
294
295 /*
296 * superblock s_state flags
297 */
298 #define OCFS2_ERROR_FS (0x00000001) /* FS saw errors */
299
300 /* Limit of space in ocfs2_dir_entry */
301 #define OCFS2_MAX_FILENAME_LEN 255
302
303 /* Maximum slots on an ocfs2 file system */
304 #define OCFS2_MAX_SLOTS 255
305
306 /* Slot map indicator for an empty slot */
307 #define OCFS2_INVALID_SLOT -1
308
309 #define OCFS2_VOL_UUID_LEN 16
310 #define OCFS2_MAX_VOL_LABEL_LEN 64
311
312 /* The cluster stack fields */
313 #define OCFS2_STACK_LABEL_LEN 4
314 #define OCFS2_CLUSTER_NAME_LEN 16
315
316 /* Classic (historically speaking) cluster stack */
317 #define OCFS2_CLASSIC_CLUSTER_STACK "o2cb"
318
319 /* Journal limits (in bytes) */
320 #define OCFS2_MIN_JOURNAL_SIZE (4 * 1024 * 1024)
321
322 /*
323 * Inline extended attribute size (in bytes)
324 * The value chosen should be aligned to 16 byte boundaries.
325 */
326 #define OCFS2_MIN_XATTR_INLINE_SIZE 256
327
328 /*
329 * Cluster info flags (ocfs2_cluster_info.ci_stackflags)
330 */
331 #define OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT (0x01)
332
333 struct ocfs2_system_inode_info {
334 char *si_name;
335 int si_iflags;
336 int si_mode;
337 };
338
339 /* System file index */
340 enum {
341 BAD_BLOCK_SYSTEM_INODE = 0,
342 GLOBAL_INODE_ALLOC_SYSTEM_INODE,
343 SLOT_MAP_SYSTEM_INODE,
344 #define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE
345 HEARTBEAT_SYSTEM_INODE,
346 GLOBAL_BITMAP_SYSTEM_INODE,
347 USER_QUOTA_SYSTEM_INODE,
348 GROUP_QUOTA_SYSTEM_INODE,
349 #define OCFS2_LAST_GLOBAL_SYSTEM_INODE GROUP_QUOTA_SYSTEM_INODE
350 #define OCFS2_FIRST_LOCAL_SYSTEM_INODE ORPHAN_DIR_SYSTEM_INODE
351 ORPHAN_DIR_SYSTEM_INODE,
352 EXTENT_ALLOC_SYSTEM_INODE,
353 INODE_ALLOC_SYSTEM_INODE,
354 JOURNAL_SYSTEM_INODE,
355 LOCAL_ALLOC_SYSTEM_INODE,
356 TRUNCATE_LOG_SYSTEM_INODE,
357 LOCAL_USER_QUOTA_SYSTEM_INODE,
358 LOCAL_GROUP_QUOTA_SYSTEM_INODE,
359 #define OCFS2_LAST_LOCAL_SYSTEM_INODE LOCAL_GROUP_QUOTA_SYSTEM_INODE
360 NUM_SYSTEM_INODES
361 };
362 #define NUM_GLOBAL_SYSTEM_INODES OCFS2_FIRST_LOCAL_SYSTEM_INODE
363 #define NUM_LOCAL_SYSTEM_INODES \
364 (NUM_SYSTEM_INODES - OCFS2_FIRST_LOCAL_SYSTEM_INODE)
365
366 static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = {
367 /* Global system inodes (single copy) */
368 /* The first two are only used from userspace mfks/tunefs */
369 [BAD_BLOCK_SYSTEM_INODE] = { "bad_blocks", 0, S_IFREG | 0644 },
370 [GLOBAL_INODE_ALLOC_SYSTEM_INODE] = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
371
372 /* These are used by the running filesystem */
373 [SLOT_MAP_SYSTEM_INODE] = { "slot_map", 0, S_IFREG | 0644 },
374 [HEARTBEAT_SYSTEM_INODE] = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 },
375 [GLOBAL_BITMAP_SYSTEM_INODE] = { "global_bitmap", 0, S_IFREG | 0644 },
376 [USER_QUOTA_SYSTEM_INODE] = { "aquota.user", OCFS2_QUOTA_FL, S_IFREG | 0644 },
377 [GROUP_QUOTA_SYSTEM_INODE] = { "aquota.group", OCFS2_QUOTA_FL, S_IFREG | 0644 },
378
379 /* Slot-specific system inodes (one copy per slot) */
380 [ORPHAN_DIR_SYSTEM_INODE] = { "orphan_dir:%04d", 0, S_IFDIR | 0755 },
381 [EXTENT_ALLOC_SYSTEM_INODE] = { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
382 [INODE_ALLOC_SYSTEM_INODE] = { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
383 [JOURNAL_SYSTEM_INODE] = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 },
384 [LOCAL_ALLOC_SYSTEM_INODE] = { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 },
385 [TRUNCATE_LOG_SYSTEM_INODE] = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 },
386 [LOCAL_USER_QUOTA_SYSTEM_INODE] = { "aquota.user:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 },
387 [LOCAL_GROUP_QUOTA_SYSTEM_INODE] = { "aquota.group:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 },
388 };
389
390 /* Parameter passed from mount.ocfs2 to module */
391 #define OCFS2_HB_NONE "heartbeat=none"
392 #define OCFS2_HB_LOCAL "heartbeat=local"
393 #define OCFS2_HB_GLOBAL "heartbeat=global"
394
395 /*
396 * OCFS2 directory file types. Only the low 3 bits are used. The
397 * other bits are reserved for now.
398 */
399 #define OCFS2_FT_UNKNOWN 0
400 #define OCFS2_FT_REG_FILE 1
401 #define OCFS2_FT_DIR 2
402 #define OCFS2_FT_CHRDEV 3
403 #define OCFS2_FT_BLKDEV 4
404 #define OCFS2_FT_FIFO 5
405 #define OCFS2_FT_SOCK 6
406 #define OCFS2_FT_SYMLINK 7
407
408 #define OCFS2_FT_MAX 8
409
410 /*
411 * OCFS2_DIR_PAD defines the directory entries boundaries
412 *
413 * NOTE: It must be a multiple of 4
414 */
415 #define OCFS2_DIR_PAD 4
416 #define OCFS2_DIR_ROUND (OCFS2_DIR_PAD - 1)
417 #define OCFS2_DIR_MEMBER_LEN offsetof(struct ocfs2_dir_entry, name)
418 #define OCFS2_DIR_REC_LEN(name_len) (((name_len) + OCFS2_DIR_MEMBER_LEN + \
419 OCFS2_DIR_ROUND) & \
420 ~OCFS2_DIR_ROUND)
421 #define OCFS2_DIR_MIN_REC_LEN OCFS2_DIR_REC_LEN(1)
422
423 #define OCFS2_LINK_MAX 32000
424 #define OCFS2_DX_LINK_MAX ((1U << 31) - 1U)
425 #define OCFS2_LINKS_HI_SHIFT 16
426 #define OCFS2_DX_ENTRIES_MAX (0xffffffffU)
427
428 #define S_SHIFT 12
429 static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = {
430 [S_IFREG >> S_SHIFT] = OCFS2_FT_REG_FILE,
431 [S_IFDIR >> S_SHIFT] = OCFS2_FT_DIR,
432 [S_IFCHR >> S_SHIFT] = OCFS2_FT_CHRDEV,
433 [S_IFBLK >> S_SHIFT] = OCFS2_FT_BLKDEV,
434 [S_IFIFO >> S_SHIFT] = OCFS2_FT_FIFO,
435 [S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK,
436 [S_IFLNK >> S_SHIFT] = OCFS2_FT_SYMLINK,
437 };
438
439
440 /*
441 * Convenience casts
442 */
443 #define OCFS2_RAW_SB(dinode) (&((dinode)->id2.i_super))
444
445 /*
446 * Block checking structure. This is used in metadata to validate the
447 * contents. If OCFS2_FEATURE_INCOMPAT_META_ECC is not set, it is all
448 * zeros.
449 */
450 struct ocfs2_block_check {
451 /*00*/ __le32 bc_crc32e; /* 802.3 Ethernet II CRC32 */
452 __le16 bc_ecc; /* Single-error-correction parity vector.
453 This is a simple Hamming code dependent
454 on the blocksize. OCFS2's maximum
455 blocksize, 4K, requires 16 parity bits,
456 so we fit in __le16. */
457 __le16 bc_reserved1;
458 /*08*/
459 };
460
461 /*
462 * On disk extent record for OCFS2
463 * It describes a range of clusters on disk.
464 *
465 * Length fields are divided into interior and leaf node versions.
466 * This leaves room for a flags field (OCFS2_EXT_*) in the leaf nodes.
467 */
468 struct ocfs2_extent_rec {
469 /*00*/ __le32 e_cpos; /* Offset into the file, in clusters */
470 union {
471 __le32 e_int_clusters; /* Clusters covered by all children */
472 struct {
473 __le16 e_leaf_clusters; /* Clusters covered by this
474 extent */
475 __u8 e_reserved1;
476 __u8 e_flags; /* Extent flags */
477 };
478 };
479 __le64 e_blkno; /* Physical disk offset, in blocks */
480 /*10*/
481 };
482
483 struct ocfs2_chain_rec {
484 __le32 c_free; /* Number of free bits in this chain. */
485 __le32 c_total; /* Number of total bits in this chain */
486 __le64 c_blkno; /* Physical disk offset (blocks) of 1st group */
487 };
488
489 struct ocfs2_truncate_rec {
490 __le32 t_start; /* 1st cluster in this log */
491 __le32 t_clusters; /* Number of total clusters covered */
492 };
493
494 /*
495 * On disk extent list for OCFS2 (node in the tree). Note that this
496 * is contained inside ocfs2_dinode or ocfs2_extent_block, so the
497 * offsets are relative to ocfs2_dinode.id2.i_list or
498 * ocfs2_extent_block.h_list, respectively.
499 */
500 struct ocfs2_extent_list {
501 /*00*/ __le16 l_tree_depth; /* Extent tree depth from this
502 point. 0 means data extents
503 hang directly off this
504 header (a leaf)
505 NOTE: The high 8 bits cannot be
506 used - tree_depth is never that big.
507 */
508 __le16 l_count; /* Number of extent records */
509 __le16 l_next_free_rec; /* Next unused extent slot */
510 __le16 l_reserved1;
511 __le64 l_reserved2; /* Pad to
512 sizeof(ocfs2_extent_rec) */
513 /*10*/ struct ocfs2_extent_rec l_recs[0]; /* Extent records */
514 };
515
516 /*
517 * On disk allocation chain list for OCFS2. Note that this is
518 * contained inside ocfs2_dinode, so the offsets are relative to
519 * ocfs2_dinode.id2.i_chain.
520 */
521 struct ocfs2_chain_list {
522 /*00*/ __le16 cl_cpg; /* Clusters per Block Group */
523 __le16 cl_bpc; /* Bits per cluster */
524 __le16 cl_count; /* Total chains in this list */
525 __le16 cl_next_free_rec; /* Next unused chain slot */
526 __le64 cl_reserved1;
527 /*10*/ struct ocfs2_chain_rec cl_recs[0]; /* Chain records */
528 };
529
530 /*
531 * On disk deallocation log for OCFS2. Note that this is
532 * contained inside ocfs2_dinode, so the offsets are relative to
533 * ocfs2_dinode.id2.i_dealloc.
534 */
535 struct ocfs2_truncate_log {
536 /*00*/ __le16 tl_count; /* Total records in this log */
537 __le16 tl_used; /* Number of records in use */
538 __le32 tl_reserved1;
539 /*08*/ struct ocfs2_truncate_rec tl_recs[0]; /* Truncate records */
540 };
541
542 /*
543 * On disk extent block (indirect block) for OCFS2
544 */
545 struct ocfs2_extent_block
546 {
547 /*00*/ __u8 h_signature[8]; /* Signature for verification */
548 struct ocfs2_block_check h_check; /* Error checking */
549 /*10*/ __le16 h_suballoc_slot; /* Slot suballocator this
550 extent_header belongs to */
551 __le16 h_suballoc_bit; /* Bit offset in suballocator
552 block group */
553 __le32 h_fs_generation; /* Must match super block */
554 __le64 h_blkno; /* Offset on disk, in blocks */
555 /*20*/ __le64 h_suballoc_loc; /* Suballocator block group this
556 eb belongs to. Only valid
557 if allocated from a
558 discontiguous block group */
559 __le64 h_next_leaf_blk; /* Offset on disk, in blocks,
560 of next leaf header pointing
561 to data */
562 /*30*/ struct ocfs2_extent_list h_list; /* Extent record list */
563 /* Actual on-disk size is one block */
564 };
565
566 /*
567 * On disk slot map for OCFS2. This defines the contents of the "slot_map"
568 * system file. A slot is valid if it contains a node number >= 0. The
569 * value -1 (0xFFFF) is OCFS2_INVALID_SLOT. This marks a slot empty.
570 */
571 struct ocfs2_slot_map {
572 /*00*/ __le16 sm_slots[0];
573 /*
574 * Actual on-disk size is one block. OCFS2_MAX_SLOTS is 255,
575 * 255 * sizeof(__le16) == 512B, within the 512B block minimum blocksize.
576 */
577 };
578
579 struct ocfs2_extended_slot {
580 /*00*/ __u8 es_valid;
581 __u8 es_reserved1[3];
582 __le32 es_node_num;
583 /*10*/
584 };
585
586 /*
587 * The extended slot map, used when OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP
588 * is set. It separates out the valid marker from the node number, and
589 * has room to grow. Unlike the old slot map, this format is defined by
590 * i_size.
591 */
592 struct ocfs2_slot_map_extended {
593 /*00*/ struct ocfs2_extended_slot se_slots[0];
594 /*
595 * Actual size is i_size of the slot_map system file. It should
596 * match s_max_slots * sizeof(struct ocfs2_extended_slot)
597 */
598 };
599
600 /*
601 * ci_stackflags is only valid if the incompat bit
602 * OCFS2_FEATURE_INCOMPAT_CLUSTERINFO is set.
603 */
604 struct ocfs2_cluster_info {
605 /*00*/ __u8 ci_stack[OCFS2_STACK_LABEL_LEN];
606 union {
607 __le32 ci_reserved;
608 struct {
609 __u8 ci_stackflags;
610 __u8 ci_reserved1;
611 __u8 ci_reserved2;
612 __u8 ci_reserved3;
613 };
614 };
615 /*08*/ __u8 ci_cluster[OCFS2_CLUSTER_NAME_LEN];
616 /*18*/
617 };
618
619 /*
620 * On disk superblock for OCFS2
621 * Note that it is contained inside an ocfs2_dinode, so all offsets
622 * are relative to the start of ocfs2_dinode.id2.
623 */
624 struct ocfs2_super_block {
625 /*00*/ __le16 s_major_rev_level;
626 __le16 s_minor_rev_level;
627 __le16 s_mnt_count;
628 __le16 s_max_mnt_count;
629 __le16 s_state; /* File system state */
630 __le16 s_errors; /* Behaviour when detecting errors */
631 __le32 s_checkinterval; /* Max time between checks */
632 /*10*/ __le64 s_lastcheck; /* Time of last check */
633 __le32 s_creator_os; /* OS */
634 __le32 s_feature_compat; /* Compatible feature set */
635 /*20*/ __le32 s_feature_incompat; /* Incompatible feature set */
636 __le32 s_feature_ro_compat; /* Readonly-compatible feature set */
637 __le64 s_root_blkno; /* Offset, in blocks, of root directory
638 dinode */
639 /*30*/ __le64 s_system_dir_blkno; /* Offset, in blocks, of system
640 directory dinode */
641 __le32 s_blocksize_bits; /* Blocksize for this fs */
642 __le32 s_clustersize_bits; /* Clustersize for this fs */
643 /*40*/ __le16 s_max_slots; /* Max number of simultaneous mounts
644 before tunefs required */
645 __le16 s_tunefs_flag;
646 __le32 s_uuid_hash; /* hash value of uuid */
647 __le64 s_first_cluster_group; /* Block offset of 1st cluster
648 * group header */
649 /*50*/ __u8 s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */
650 /*90*/ __u8 s_uuid[OCFS2_VOL_UUID_LEN]; /* 128-bit uuid */
651 /*A0*/ struct ocfs2_cluster_info s_cluster_info; /* Only valid if either
652 userspace or clusterinfo
653 INCOMPAT flag set. */
654 /*B8*/ __le16 s_xattr_inline_size; /* extended attribute inline size
655 for this fs*/
656 __le16 s_reserved0;
657 __le32 s_dx_seed[3]; /* seed[0-2] for dx dir hash.
658 * s_uuid_hash serves as seed[3]. */
659 /*C0*/ __le64 s_reserved2[15]; /* Fill out superblock */
660 /*140*/
661
662 /*
663 * NOTE: As stated above, all offsets are relative to
664 * ocfs2_dinode.id2, which is at 0xC0 in the inode.
665 * 0xC0 + 0x140 = 0x200 or 512 bytes. A superblock must fit within
666 * our smallest blocksize, which is 512 bytes. To ensure this,
667 * we reserve the space in s_reserved2. Anything past s_reserved2
668 * will not be available on the smallest blocksize.
669 */
670 };
671
672 /*
673 * Local allocation bitmap for OCFS2 slots
674 * Note that it exists inside an ocfs2_dinode, so all offsets are
675 * relative to the start of ocfs2_dinode.id2.
676 */
677 struct ocfs2_local_alloc
678 {
679 /*00*/ __le32 la_bm_off; /* Starting bit offset in main bitmap */
680 __le16 la_size; /* Size of included bitmap, in bytes */
681 __le16 la_reserved1;
682 __le64 la_reserved2;
683 /*10*/ __u8 la_bitmap[0];
684 };
685
686 /*
687 * Data-in-inode header. This is only used if i_dyn_features has
688 * OCFS2_INLINE_DATA_FL set.
689 */
690 struct ocfs2_inline_data
691 {
692 /*00*/ __le16 id_count; /* Number of bytes that can be used
693 * for data, starting at id_data */
694 __le16 id_reserved0;
695 __le32 id_reserved1;
696 __u8 id_data[0]; /* Start of user data */
697 };
698
699 /*
700 * On disk inode for OCFS2
701 */
702 struct ocfs2_dinode {
703 /*00*/ __u8 i_signature[8]; /* Signature for validation */
704 __le32 i_generation; /* Generation number */
705 __le16 i_suballoc_slot; /* Slot suballocator this inode
706 belongs to */
707 __le16 i_suballoc_bit; /* Bit offset in suballocator
708 block group */
709 /*10*/ __le16 i_links_count_hi; /* High 16 bits of links count */
710 __le16 i_xattr_inline_size;
711 __le32 i_clusters; /* Cluster count */
712 __le32 i_uid; /* Owner UID */
713 __le32 i_gid; /* Owning GID */
714 /*20*/ __le64 i_size; /* Size in bytes */
715 __le16 i_mode; /* File mode */
716 __le16 i_links_count; /* Links count */
717 __le32 i_flags; /* File flags */
718 /*30*/ __le64 i_atime; /* Access time */
719 __le64 i_ctime; /* Creation time */
720 /*40*/ __le64 i_mtime; /* Modification time */
721 __le64 i_dtime; /* Deletion time */
722 /*50*/ __le64 i_blkno; /* Offset on disk, in blocks */
723 __le64 i_last_eb_blk; /* Pointer to last extent
724 block */
725 /*60*/ __le32 i_fs_generation; /* Generation per fs-instance */
726 __le32 i_atime_nsec;
727 __le32 i_ctime_nsec;
728 __le32 i_mtime_nsec;
729 /*70*/ __le32 i_attr;
730 __le16 i_orphaned_slot; /* Only valid when OCFS2_ORPHANED_FL
731 was set in i_flags */
732 __le16 i_dyn_features;
733 __le64 i_xattr_loc;
734 /*80*/ struct ocfs2_block_check i_check; /* Error checking */
735 /*88*/ __le64 i_dx_root; /* Pointer to dir index root block */
736 /*90*/ __le64 i_refcount_loc;
737 __le64 i_suballoc_loc; /* Suballocator block group this
738 inode belongs to. Only valid
739 if allocated from a
740 discontiguous block group */
741 /*A0*/ __le16 i_dio_orphaned_slot; /* only used for append dio write */
742 __le16 i_reserved1[3];
743 __le64 i_reserved2[2];
744 /*B8*/ union {
745 __le64 i_pad1; /* Generic way to refer to this
746 64bit union */
747 struct {
748 __le64 i_rdev; /* Device number */
749 } dev1;
750 struct { /* Info for bitmap system
751 inodes */
752 __le32 i_used; /* Bits (ie, clusters) used */
753 __le32 i_total; /* Total bits (clusters)
754 available */
755 } bitmap1;
756 struct { /* Info for journal system
757 inodes */
758 __le32 ij_flags; /* Mounted, version, etc. */
759 __le32 ij_recovery_generation; /* Incremented when the
760 journal is recovered
761 after an unclean
762 shutdown */
763 } journal1;
764 } id1; /* Inode type dependent 1 */
765 /*C0*/ union {
766 struct ocfs2_super_block i_super;
767 struct ocfs2_local_alloc i_lab;
768 struct ocfs2_chain_list i_chain;
769 struct ocfs2_extent_list i_list;
770 struct ocfs2_truncate_log i_dealloc;
771 struct ocfs2_inline_data i_data;
772 __u8 i_symlink[0];
773 } id2;
774 /* Actual on-disk size is one block */
775 };
776
777 /*
778 * On-disk directory entry structure for OCFS2
779 *
780 * Packed as this structure could be accessed unaligned on 64-bit platforms
781 */
782 struct ocfs2_dir_entry {
783 /*00*/ __le64 inode; /* Inode number */
784 __le16 rec_len; /* Directory entry length */
785 __u8 name_len; /* Name length */
786 __u8 file_type;
787 /*0C*/ char name[OCFS2_MAX_FILENAME_LEN]; /* File name */
788 /* Actual on-disk length specified by rec_len */
789 } __attribute__ ((packed));
790
791 /*
792 * Per-block record for the unindexed directory btree. This is carefully
793 * crafted so that the rec_len and name_len records of an ocfs2_dir_entry are
794 * mirrored. That way, the directory manipulation code needs a minimal amount
795 * of update.
796 *
797 * NOTE: Keep this structure aligned to a multiple of 4 bytes.
798 */
799 struct ocfs2_dir_block_trailer {
800 /*00*/ __le64 db_compat_inode; /* Always zero. Was inode */
801
802 __le16 db_compat_rec_len; /* Backwards compatible with
803 * ocfs2_dir_entry. */
804 __u8 db_compat_name_len; /* Always zero. Was name_len */
805 __u8 db_reserved0;
806 __le16 db_reserved1;
807 __le16 db_free_rec_len; /* Size of largest empty hole
808 * in this block. (unused) */
809 /*10*/ __u8 db_signature[8]; /* Signature for verification */
810 __le64 db_reserved2;
811 __le64 db_free_next; /* Next block in list (unused) */
812 /*20*/ __le64 db_blkno; /* Offset on disk, in blocks */
813 __le64 db_parent_dinode; /* dinode which owns me, in
814 blocks */
815 /*30*/ struct ocfs2_block_check db_check; /* Error checking */
816 /*40*/
817 };
818
819 /*
820 * A directory entry in the indexed tree. We don't store the full name here,
821 * but instead provide a pointer to the full dirent in the unindexed tree.
822 *
823 * We also store name_len here so as to reduce the number of leaf blocks we
824 * need to search in case of collisions.
825 */
826 struct ocfs2_dx_entry {
827 __le32 dx_major_hash; /* Used to find logical
828 * cluster in index */
829 __le32 dx_minor_hash; /* Lower bits used to find
830 * block in cluster */
831 __le64 dx_dirent_blk; /* Physical block in unindexed
832 * tree holding this dirent. */
833 };
834
835 struct ocfs2_dx_entry_list {
836 __le32 de_reserved;
837 __le16 de_count; /* Maximum number of entries
838 * possible in de_entries */
839 __le16 de_num_used; /* Current number of
840 * de_entries entries */
841 struct ocfs2_dx_entry de_entries[0]; /* Indexed dir entries
842 * in a packed array of
843 * length de_num_used */
844 };
845
846 #define OCFS2_DX_FLAG_INLINE 0x01
847
848 /*
849 * A directory indexing block. Each indexed directory has one of these,
850 * pointed to by ocfs2_dinode.
851 *
852 * This block stores an indexed btree root, and a set of free space
853 * start-of-list pointers.
854 */
855 struct ocfs2_dx_root_block {
856 __u8 dr_signature[8]; /* Signature for verification */
857 struct ocfs2_block_check dr_check; /* Error checking */
858 __le16 dr_suballoc_slot; /* Slot suballocator this
859 * block belongs to. */
860 __le16 dr_suballoc_bit; /* Bit offset in suballocator
861 * block group */
862 __le32 dr_fs_generation; /* Must match super block */
863 __le64 dr_blkno; /* Offset on disk, in blocks */
864 __le64 dr_last_eb_blk; /* Pointer to last
865 * extent block */
866 __le32 dr_clusters; /* Clusters allocated
867 * to the indexed tree. */
868 __u8 dr_flags; /* OCFS2_DX_FLAG_* flags */
869 __u8 dr_reserved0;
870 __le16 dr_reserved1;
871 __le64 dr_dir_blkno; /* Pointer to parent inode */
872 __le32 dr_num_entries; /* Total number of
873 * names stored in
874 * this directory.*/
875 __le32 dr_reserved2;
876 __le64 dr_free_blk; /* Pointer to head of free
877 * unindexed block list. */
878 __le64 dr_suballoc_loc; /* Suballocator block group
879 this root belongs to.
880 Only valid if allocated
881 from a discontiguous
882 block group */
883 __le64 dr_reserved3[14];
884 union {
885 struct ocfs2_extent_list dr_list; /* Keep this aligned to 128
886 * bits for maximum space
887 * efficiency. */
888 struct ocfs2_dx_entry_list dr_entries; /* In-root-block list of
889 * entries. We grow out
890 * to extents if this
891 * gets too big. */
892 };
893 };
894
895 /*
896 * The header of a leaf block in the indexed tree.
897 */
898 struct ocfs2_dx_leaf {
899 __u8 dl_signature[8];/* Signature for verification */
900 struct ocfs2_block_check dl_check; /* Error checking */
901 __le64 dl_blkno; /* Offset on disk, in blocks */
902 __le32 dl_fs_generation;/* Must match super block */
903 __le32 dl_reserved0;
904 __le64 dl_reserved1;
905 struct ocfs2_dx_entry_list dl_list;
906 };
907
908 /*
909 * Largest bitmap for a block (suballocator) group in bytes. This limit
910 * does not affect cluster groups (global allocator). Cluster group
911 * bitmaps run to the end of the block.
912 */
913 #define OCFS2_MAX_BG_BITMAP_SIZE 256
914
915 /*
916 * On disk allocator group structure for OCFS2
917 */
918 struct ocfs2_group_desc
919 {
920 /*00*/ __u8 bg_signature[8]; /* Signature for validation */
921 __le16 bg_size; /* Size of included bitmap in
922 bytes. */
923 __le16 bg_bits; /* Bits represented by this
924 group. */
925 __le16 bg_free_bits_count; /* Free bits count */
926 __le16 bg_chain; /* What chain I am in. */
927 /*10*/ __le32 bg_generation;
928 __le32 bg_reserved1;
929 __le64 bg_next_group; /* Next group in my list, in
930 blocks */
931 /*20*/ __le64 bg_parent_dinode; /* dinode which owns me, in
932 blocks */
933 __le64 bg_blkno; /* Offset on disk, in blocks */
934 /*30*/ struct ocfs2_block_check bg_check; /* Error checking */
935 __le64 bg_reserved2;
936 /*40*/ union {
937 __u8 bg_bitmap[0];
938 struct {
939 /*
940 * Block groups may be discontiguous when
941 * OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG is set.
942 * The extents of a discontiguous block group are
943 * stored in bg_list. It is a flat list.
944 * l_tree_depth must always be zero. A
945 * discontiguous group is signified by a non-zero
946 * bg_list->l_next_free_rec. Only block groups
947 * can be discontiguous; Cluster groups cannot.
948 * We've never made a block group with more than
949 * 2048 blocks (256 bytes of bg_bitmap). This
950 * codifies that limit so that we can fit bg_list.
951 * bg_size of a discontiguous block group will
952 * be 256 to match bg_bitmap_filler.
953 */
954 __u8 bg_bitmap_filler[OCFS2_MAX_BG_BITMAP_SIZE];
955 /*140*/ struct ocfs2_extent_list bg_list;
956 };
957 };
958 /* Actual on-disk size is one block */
959 };
960
961 struct ocfs2_refcount_rec {
962 /*00*/ __le64 r_cpos; /* Physical offset, in clusters */
963 __le32 r_clusters; /* Clusters covered by this extent */
964 __le32 r_refcount; /* Reference count of this extent */
965 /*10*/
966 };
967 #define OCFS2_32BIT_POS_MASK (0xffffffffULL)
968
969 #define OCFS2_REFCOUNT_LEAF_FL (0x00000001)
970 #define OCFS2_REFCOUNT_TREE_FL (0x00000002)
971
972 struct ocfs2_refcount_list {
973 /*00*/ __le16 rl_count; /* Maximum number of entries possible
974 in rl_records */
975 __le16 rl_used; /* Current number of used records */
976 __le32 rl_reserved2;
977 __le64 rl_reserved1; /* Pad to sizeof(ocfs2_refcount_record) */
978 /*10*/ struct ocfs2_refcount_rec rl_recs[0]; /* Refcount records */
979 };
980
981
982 struct ocfs2_refcount_block {
983 /*00*/ __u8 rf_signature[8]; /* Signature for verification */
984 __le16 rf_suballoc_slot; /* Slot suballocator this block
985 belongs to */
986 __le16 rf_suballoc_bit; /* Bit offset in suballocator
987 block group */
988 __le32 rf_fs_generation; /* Must match superblock */
989 /*10*/ __le64 rf_blkno; /* Offset on disk, in blocks */
990 __le64 rf_parent; /* Parent block, only valid if
991 OCFS2_REFCOUNT_LEAF_FL is set in
992 rf_flags */
993 /*20*/ struct ocfs2_block_check rf_check; /* Error checking */
994 __le64 rf_last_eb_blk; /* Pointer to last extent block */
995 /*30*/ __le32 rf_count; /* Number of inodes sharing this
996 refcount tree */
997 __le32 rf_flags; /* See the flags above */
998 __le32 rf_clusters; /* clusters covered by refcount tree. */
999 __le32 rf_cpos; /* cluster offset in refcount tree.*/
1000 /*40*/ __le32 rf_generation; /* generation number. all be the same
1001 * for the same refcount tree. */
1002 __le32 rf_reserved0;
1003 __le64 rf_suballoc_loc; /* Suballocator block group this
1004 refcount block belongs to. Only
1005 valid if allocated from a
1006 discontiguous block group */
1007 /*50*/ __le64 rf_reserved1[6];
1008 /*80*/ union {
1009 struct ocfs2_refcount_list rf_records; /* List of refcount
1010 records */
1011 struct ocfs2_extent_list rf_list; /* Extent record list,
1012 only valid if
1013 OCFS2_REFCOUNT_TREE_FL
1014 is set in rf_flags */
1015 };
1016 /* Actual on-disk size is one block */
1017 };
1018
1019 /*
1020 * On disk extended attribute structure for OCFS2.
1021 */
1022
1023 /*
1024 * ocfs2_xattr_entry indicates one extend attribute.
1025 *
1026 * Note that it can be stored in inode, one block or one xattr bucket.
1027 */
1028 struct ocfs2_xattr_entry {
1029 __le32 xe_name_hash; /* hash value of xattr prefix+suffix. */
1030 __le16 xe_name_offset; /* byte offset from the 1st entry in the
1031 local xattr storage(inode, xattr block or
1032 xattr bucket). */
1033 __u8 xe_name_len; /* xattr name len, doesn't include prefix. */
1034 __u8 xe_type; /* the low 7 bits indicate the name prefix
1035 * type and the highest bit indicates whether
1036 * the EA is stored in the local storage. */
1037 __le64 xe_value_size; /* real xattr value length. */
1038 };
1039
1040 /*
1041 * On disk structure for xattr header.
1042 *
1043 * One ocfs2_xattr_header describes how many ocfs2_xattr_entry records in
1044 * the local xattr storage.
1045 */
1046 struct ocfs2_xattr_header {
1047 __le16 xh_count; /* contains the count of how
1048 many records are in the
1049 local xattr storage. */
1050 __le16 xh_free_start; /* current offset for storing
1051 xattr. */
1052 __le16 xh_name_value_len; /* total length of name/value
1053 length in this bucket. */
1054 __le16 xh_num_buckets; /* Number of xattr buckets
1055 in this extent record,
1056 only valid in the first
1057 bucket. */
1058 struct ocfs2_block_check xh_check; /* Error checking
1059 (Note, this is only
1060 used for xattr
1061 buckets. A block uses
1062 xb_check and sets
1063 this field to zero.) */
1064 struct ocfs2_xattr_entry xh_entries[0]; /* xattr entry list. */
1065 };
1066
1067 /*
1068 * On disk structure for xattr value root.
1069 *
1070 * When an xattr's value is large enough, it is stored in an external
1071 * b-tree like file data. The xattr value root points to this structure.
1072 */
1073 struct ocfs2_xattr_value_root {
1074 /*00*/ __le32 xr_clusters; /* clusters covered by xattr value. */
1075 __le32 xr_reserved0;
1076 __le64 xr_last_eb_blk; /* Pointer to last extent block */
1077 /*10*/ struct ocfs2_extent_list xr_list; /* Extent record list */
1078 };
1079
1080 /*
1081 * On disk structure for xattr tree root.
1082 *
1083 * It is used when there are too many extended attributes for one file. These
1084 * attributes will be organized and stored in an indexed-btree.
1085 */
1086 struct ocfs2_xattr_tree_root {
1087 /*00*/ __le32 xt_clusters; /* clusters covered by xattr. */
1088 __le32 xt_reserved0;
1089 __le64 xt_last_eb_blk; /* Pointer to last extent block */
1090 /*10*/ struct ocfs2_extent_list xt_list; /* Extent record list */
1091 };
1092
1093 #define OCFS2_XATTR_INDEXED 0x1
1094 #define OCFS2_HASH_SHIFT 5
1095 #define OCFS2_XATTR_ROUND 3
1096 #define OCFS2_XATTR_SIZE(size) (((size) + OCFS2_XATTR_ROUND) & \
1097 ~(OCFS2_XATTR_ROUND))
1098
1099 #define OCFS2_XATTR_BUCKET_SIZE 4096
1100 #define OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET (OCFS2_XATTR_BUCKET_SIZE \
1101 / OCFS2_MIN_BLOCKSIZE)
1102
1103 /*
1104 * On disk structure for xattr block.
1105 */
1106 struct ocfs2_xattr_block {
1107 /*00*/ __u8 xb_signature[8]; /* Signature for verification */
1108 __le16 xb_suballoc_slot; /* Slot suballocator this
1109 block belongs to. */
1110 __le16 xb_suballoc_bit; /* Bit offset in suballocator
1111 block group */
1112 __le32 xb_fs_generation; /* Must match super block */
1113 /*10*/ __le64 xb_blkno; /* Offset on disk, in blocks */
1114 struct ocfs2_block_check xb_check; /* Error checking */
1115 /*20*/ __le16 xb_flags; /* Indicates whether this block contains
1116 real xattr or a xattr tree. */
1117 __le16 xb_reserved0;
1118 __le32 xb_reserved1;
1119 __le64 xb_suballoc_loc; /* Suballocator block group this
1120 xattr block belongs to. Only
1121 valid if allocated from a
1122 discontiguous block group */
1123 /*30*/ union {
1124 struct ocfs2_xattr_header xb_header; /* xattr header if this
1125 block contains xattr */
1126 struct ocfs2_xattr_tree_root xb_root;/* xattr tree root if this
1127 block cotains xattr
1128 tree. */
1129 } xb_attrs;
1130 };
1131
1132 #define OCFS2_XATTR_ENTRY_LOCAL 0x80
1133 #define OCFS2_XATTR_TYPE_MASK 0x7F
1134 static inline void ocfs2_xattr_set_local(struct ocfs2_xattr_entry *xe,
1135 int local)
1136 {
1137 if (local)
1138 xe->xe_type |= OCFS2_XATTR_ENTRY_LOCAL;
1139 else
1140 xe->xe_type &= ~OCFS2_XATTR_ENTRY_LOCAL;
1141 }
1142
1143 static inline int ocfs2_xattr_is_local(struct ocfs2_xattr_entry *xe)
1144 {
1145 return xe->xe_type & OCFS2_XATTR_ENTRY_LOCAL;
1146 }
1147
1148 static inline void ocfs2_xattr_set_type(struct ocfs2_xattr_entry *xe, int type)
1149 {
1150 xe->xe_type |= type & OCFS2_XATTR_TYPE_MASK;
1151 }
1152
1153 static inline int ocfs2_xattr_get_type(struct ocfs2_xattr_entry *xe)
1154 {
1155 return xe->xe_type & OCFS2_XATTR_TYPE_MASK;
1156 }
1157
1158 /*
1159 * On disk structures for global quota file
1160 */
1161
1162 /* Magic numbers and known versions for global quota files */
1163 #define OCFS2_GLOBAL_QMAGICS {\
1164 0x0cf52470, /* USRQUOTA */ \
1165 0x0cf52471 /* GRPQUOTA */ \
1166 }
1167
1168 #define OCFS2_GLOBAL_QVERSIONS {\
1169 0, \
1170 0, \
1171 }
1172
1173
1174 /* Each block of each quota file has a certain fixed number of bytes reserved
1175 * for OCFS2 internal use at its end. OCFS2 can use it for things like
1176 * checksums, etc. */
1177 #define OCFS2_QBLK_RESERVED_SPACE 8
1178
1179 /* Generic header of all quota files */
1180 struct ocfs2_disk_dqheader {
1181 __le32 dqh_magic; /* Magic number identifying file */
1182 __le32 dqh_version; /* Quota format version */
1183 };
1184
1185 #define OCFS2_GLOBAL_INFO_OFF (sizeof(struct ocfs2_disk_dqheader))
1186
1187 /* Information header of global quota file (immediately follows the generic
1188 * header) */
1189 struct ocfs2_global_disk_dqinfo {
1190 /*00*/ __le32 dqi_bgrace; /* Grace time for space softlimit excess */
1191 __le32 dqi_igrace; /* Grace time for inode softlimit excess */
1192 __le32 dqi_syncms; /* Time after which we sync local changes to
1193 * global quota file */
1194 __le32 dqi_blocks; /* Number of blocks in quota file */
1195 /*10*/ __le32 dqi_free_blk; /* First free block in quota file */
1196 __le32 dqi_free_entry; /* First block with free dquot entry in quota
1197 * file */
1198 };
1199
1200 /* Structure with global user / group information. We reserve some space
1201 * for future use. */
1202 struct ocfs2_global_disk_dqblk {
1203 /*00*/ __le32 dqb_id; /* ID the structure belongs to */
1204 __le32 dqb_use_count; /* Number of nodes having reference to this structure */
1205 __le64 dqb_ihardlimit; /* absolute limit on allocated inodes */
1206 /*10*/ __le64 dqb_isoftlimit; /* preferred inode limit */
1207 __le64 dqb_curinodes; /* current # allocated inodes */
1208 /*20*/ __le64 dqb_bhardlimit; /* absolute limit on disk space */
1209 __le64 dqb_bsoftlimit; /* preferred limit on disk space */
1210 /*30*/ __le64 dqb_curspace; /* current space occupied */
1211 __le64 dqb_btime; /* time limit for excessive disk use */
1212 /*40*/ __le64 dqb_itime; /* time limit for excessive inode use */
1213 __le64 dqb_pad1;
1214 /*50*/ __le64 dqb_pad2;
1215 };
1216
1217 /*
1218 * On-disk structures for local quota file
1219 */
1220
1221 /* Magic numbers and known versions for local quota files */
1222 #define OCFS2_LOCAL_QMAGICS {\
1223 0x0cf524c0, /* USRQUOTA */ \
1224 0x0cf524c1 /* GRPQUOTA */ \
1225 }
1226
1227 #define OCFS2_LOCAL_QVERSIONS {\
1228 0, \
1229 0, \
1230 }
1231
1232 /* Quota flags in dqinfo header */
1233 #define OLQF_CLEAN 0x0001 /* Quota file is empty (this should be after\
1234 * quota has been cleanly turned off) */
1235
1236 #define OCFS2_LOCAL_INFO_OFF (sizeof(struct ocfs2_disk_dqheader))
1237
1238 /* Information header of local quota file (immediately follows the generic
1239 * header) */
1240 struct ocfs2_local_disk_dqinfo {
1241 __le32 dqi_flags; /* Flags for quota file */
1242 __le32 dqi_chunks; /* Number of chunks of quota structures
1243 * with a bitmap */
1244 __le32 dqi_blocks; /* Number of blocks allocated for quota file */
1245 };
1246
1247 /* Header of one chunk of a quota file */
1248 struct ocfs2_local_disk_chunk {
1249 __le32 dqc_free; /* Number of free entries in the bitmap */
1250 __u8 dqc_bitmap[0]; /* Bitmap of entries in the corresponding
1251 * chunk of quota file */
1252 };
1253
1254 /* One entry in local quota file */
1255 struct ocfs2_local_disk_dqblk {
1256 /*00*/ __le64 dqb_id; /* id this quota applies to */
1257 __le64 dqb_spacemod; /* Change in the amount of used space */
1258 /*10*/ __le64 dqb_inodemod; /* Change in the amount of used inodes */
1259 };
1260
1261
1262 /*
1263 * The quota trailer lives at the end of each quota block.
1264 */
1265
1266 struct ocfs2_disk_dqtrailer {
1267 /*00*/ struct ocfs2_block_check dq_check; /* Error checking */
1268 /*08*/ /* Cannot be larger than OCFS2_QBLK_RESERVED_SPACE */
1269 };
1270
1271 static inline struct ocfs2_disk_dqtrailer *ocfs2_block_dqtrailer(int blocksize,
1272 void *buf)
1273 {
1274 char *ptr = buf;
1275 ptr += blocksize - OCFS2_QBLK_RESERVED_SPACE;
1276
1277 return (struct ocfs2_disk_dqtrailer *)ptr;
1278 }
1279
1280 #ifdef __KERNEL__
1281 static inline int ocfs2_fast_symlink_chars(struct super_block *sb)
1282 {
1283 return sb->s_blocksize -
1284 offsetof(struct ocfs2_dinode, id2.i_symlink);
1285 }
1286
1287 static inline int ocfs2_max_inline_data_with_xattr(struct super_block *sb,
1288 struct ocfs2_dinode *di)
1289 {
1290 unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size);
1291
1292 if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL)
1293 return sb->s_blocksize -
1294 offsetof(struct ocfs2_dinode, id2.i_data.id_data) -
1295 xattrsize;
1296 else
1297 return sb->s_blocksize -
1298 offsetof(struct ocfs2_dinode, id2.i_data.id_data);
1299 }
1300
1301 static inline int ocfs2_extent_recs_per_inode(struct super_block *sb)
1302 {
1303 int size;
1304
1305 size = sb->s_blocksize -
1306 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
1307
1308 return size / sizeof(struct ocfs2_extent_rec);
1309 }
1310
1311 static inline int ocfs2_extent_recs_per_inode_with_xattr(
1312 struct super_block *sb,
1313 struct ocfs2_dinode *di)
1314 {
1315 int size;
1316 unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size);
1317
1318 if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL)
1319 size = sb->s_blocksize -
1320 offsetof(struct ocfs2_dinode, id2.i_list.l_recs) -
1321 xattrsize;
1322 else
1323 size = sb->s_blocksize -
1324 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
1325
1326 return size / sizeof(struct ocfs2_extent_rec);
1327 }
1328
1329 static inline int ocfs2_extent_recs_per_dx_root(struct super_block *sb)
1330 {
1331 int size;
1332
1333 size = sb->s_blocksize -
1334 offsetof(struct ocfs2_dx_root_block, dr_list.l_recs);
1335
1336 return size / sizeof(struct ocfs2_extent_rec);
1337 }
1338
1339 static inline int ocfs2_chain_recs_per_inode(struct super_block *sb)
1340 {
1341 int size;
1342
1343 size = sb->s_blocksize -
1344 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
1345
1346 return size / sizeof(struct ocfs2_chain_rec);
1347 }
1348
1349 static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb)
1350 {
1351 int size;
1352
1353 size = sb->s_blocksize -
1354 offsetof(struct ocfs2_extent_block, h_list.l_recs);
1355
1356 return size / sizeof(struct ocfs2_extent_rec);
1357 }
1358
1359 static inline u16 ocfs2_extent_recs_per_gd(struct super_block *sb)
1360 {
1361 int size;
1362
1363 size = sb->s_blocksize -
1364 offsetof(struct ocfs2_group_desc, bg_list.l_recs);
1365
1366 return size / sizeof(struct ocfs2_extent_rec);
1367 }
1368
1369 static inline int ocfs2_dx_entries_per_leaf(struct super_block *sb)
1370 {
1371 int size;
1372
1373 size = sb->s_blocksize -
1374 offsetof(struct ocfs2_dx_leaf, dl_list.de_entries);
1375
1376 return size / sizeof(struct ocfs2_dx_entry);
1377 }
1378
1379 static inline int ocfs2_dx_entries_per_root(struct super_block *sb)
1380 {
1381 int size;
1382
1383 size = sb->s_blocksize -
1384 offsetof(struct ocfs2_dx_root_block, dr_entries.de_entries);
1385
1386 return size / sizeof(struct ocfs2_dx_entry);
1387 }
1388
1389 static inline u16 ocfs2_local_alloc_size(struct super_block *sb)
1390 {
1391 u16 size;
1392
1393 size = sb->s_blocksize -
1394 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
1395
1396 return size;
1397 }
1398
1399 static inline int ocfs2_group_bitmap_size(struct super_block *sb,
1400 int suballocator,
1401 u32 feature_incompat)
1402 {
1403 int size = sb->s_blocksize -
1404 offsetof(struct ocfs2_group_desc, bg_bitmap);
1405
1406 /*
1407 * The cluster allocator uses the entire block. Suballocators have
1408 * never used more than OCFS2_MAX_BG_BITMAP_SIZE. Unfortunately, older
1409 * code expects bg_size set to the maximum. Thus we must keep
1410 * bg_size as-is unless discontig_bg is enabled.
1411 */
1412 if (suballocator &&
1413 (feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG))
1414 size = OCFS2_MAX_BG_BITMAP_SIZE;
1415
1416 return size;
1417 }
1418
1419 static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb)
1420 {
1421 int size;
1422
1423 size = sb->s_blocksize -
1424 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
1425
1426 return size / sizeof(struct ocfs2_truncate_rec);
1427 }
1428
1429 static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index)
1430 {
1431 u64 offset = OCFS2_BACKUP_SB_START;
1432
1433 if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
1434 offset <<= (2 * index);
1435 offset >>= sb->s_blocksize_bits;
1436 return offset;
1437 }
1438
1439 return 0;
1440
1441 }
1442
1443 static inline u16 ocfs2_xattr_recs_per_xb(struct super_block *sb)
1444 {
1445 int size;
1446
1447 size = sb->s_blocksize -
1448 offsetof(struct ocfs2_xattr_block,
1449 xb_attrs.xb_root.xt_list.l_recs);
1450
1451 return size / sizeof(struct ocfs2_extent_rec);
1452 }
1453
1454 static inline u16 ocfs2_extent_recs_per_rb(struct super_block *sb)
1455 {
1456 int size;
1457
1458 size = sb->s_blocksize -
1459 offsetof(struct ocfs2_refcount_block, rf_list.l_recs);
1460
1461 return size / sizeof(struct ocfs2_extent_rec);
1462 }
1463
1464 static inline u16 ocfs2_refcount_recs_per_rb(struct super_block *sb)
1465 {
1466 int size;
1467
1468 size = sb->s_blocksize -
1469 offsetof(struct ocfs2_refcount_block, rf_records.rl_recs);
1470
1471 return size / sizeof(struct ocfs2_refcount_rec);
1472 }
1473
1474 static inline u32
1475 ocfs2_get_ref_rec_low_cpos(const struct ocfs2_refcount_rec *rec)
1476 {
1477 return le64_to_cpu(rec->r_cpos) & OCFS2_32BIT_POS_MASK;
1478 }
1479 #else
1480 static inline int ocfs2_fast_symlink_chars(int blocksize)
1481 {
1482 return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink);
1483 }
1484
1485 static inline int ocfs2_max_inline_data_with_xattr(int blocksize,
1486 struct ocfs2_dinode *di)
1487 {
1488 if (di && (di->i_dyn_features & OCFS2_INLINE_XATTR_FL))
1489 return blocksize -
1490 offsetof(struct ocfs2_dinode, id2.i_data.id_data) -
1491 di->i_xattr_inline_size;
1492 else
1493 return blocksize -
1494 offsetof(struct ocfs2_dinode, id2.i_data.id_data);
1495 }
1496
1497 static inline int ocfs2_extent_recs_per_inode(int blocksize)
1498 {
1499 int size;
1500
1501 size = blocksize -
1502 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
1503
1504 return size / sizeof(struct ocfs2_extent_rec);
1505 }
1506
1507 static inline int ocfs2_chain_recs_per_inode(int blocksize)
1508 {
1509 int size;
1510
1511 size = blocksize -
1512 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
1513
1514 return size / sizeof(struct ocfs2_chain_rec);
1515 }
1516
1517 static inline int ocfs2_extent_recs_per_eb(int blocksize)
1518 {
1519 int size;
1520
1521 size = blocksize -
1522 offsetof(struct ocfs2_extent_block, h_list.l_recs);
1523
1524 return size / sizeof(struct ocfs2_extent_rec);
1525 }
1526
1527 static inline int ocfs2_extent_recs_per_gd(int blocksize)
1528 {
1529 int size;
1530
1531 size = blocksize -
1532 offsetof(struct ocfs2_group_desc, bg_list.l_recs);
1533
1534 return size / sizeof(struct ocfs2_extent_rec);
1535 }
1536
1537 static inline int ocfs2_local_alloc_size(int blocksize)
1538 {
1539 int size;
1540
1541 size = blocksize -
1542 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
1543
1544 return size;
1545 }
1546
1547 static inline int ocfs2_group_bitmap_size(int blocksize,
1548 int suballocator,
1549 uint32_t feature_incompat)
1550 {
1551 int size = sb->s_blocksize -
1552 offsetof(struct ocfs2_group_desc, bg_bitmap);
1553
1554 /*
1555 * The cluster allocator uses the entire block. Suballocators have
1556 * never used more than OCFS2_MAX_BG_BITMAP_SIZE. Unfortunately, older
1557 * code expects bg_size set to the maximum. Thus we must keep
1558 * bg_size as-is unless discontig_bg is enabled.
1559 */
1560 if (suballocator &&
1561 (feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG))
1562 size = OCFS2_MAX_BG_BITMAP_SIZE;
1563
1564 return size;
1565 }
1566
1567 static inline int ocfs2_truncate_recs_per_inode(int blocksize)
1568 {
1569 int size;
1570
1571 size = blocksize -
1572 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
1573
1574 return size / sizeof(struct ocfs2_truncate_rec);
1575 }
1576
1577 static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index)
1578 {
1579 uint64_t offset = OCFS2_BACKUP_SB_START;
1580
1581 if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
1582 offset <<= (2 * index);
1583 offset /= blocksize;
1584 return offset;
1585 }
1586
1587 return 0;
1588 }
1589
1590 static inline int ocfs2_xattr_recs_per_xb(int blocksize)
1591 {
1592 int size;
1593
1594 size = blocksize -
1595 offsetof(struct ocfs2_xattr_block,
1596 xb_attrs.xb_root.xt_list.l_recs);
1597
1598 return size / sizeof(struct ocfs2_extent_rec);
1599 }
1600 #endif /* __KERNEL__ */
1601
1602
1603 static inline int ocfs2_system_inode_is_global(int type)
1604 {
1605 return ((type >= 0) &&
1606 (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE));
1607 }
1608
1609 static inline int ocfs2_sprintf_system_inode_name(char *buf, int len,
1610 int type, int slot)
1611 {
1612 int chars;
1613
1614 /*
1615 * Global system inodes can only have one copy. Everything
1616 * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode
1617 * list has a copy per slot.
1618 */
1619 if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)
1620 chars = snprintf(buf, len, "%s",
1621 ocfs2_system_inodes[type].si_name);
1622 else
1623 chars = snprintf(buf, len,
1624 ocfs2_system_inodes[type].si_name,
1625 slot);
1626
1627 return chars;
1628 }
1629
1630 static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de,
1631 umode_t mode)
1632 {
1633 de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
1634 }
1635
1636 static inline int ocfs2_gd_is_discontig(struct ocfs2_group_desc *gd)
1637 {
1638 if ((offsetof(struct ocfs2_group_desc, bg_bitmap) +
1639 le16_to_cpu(gd->bg_size)) !=
1640 offsetof(struct ocfs2_group_desc, bg_list))
1641 return 0;
1642 /*
1643 * Only valid to check l_next_free_rec if
1644 * bg_bitmap + bg_size == bg_list.
1645 */
1646 if (!gd->bg_list.l_next_free_rec)
1647 return 0;
1648 return 1;
1649 }
1650 #endif /* _OCFS2_FS_H */
1651
Linux with added FPC-III support