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Fix gcc 4.5.1 miscompiling drivers/char/i8k.c (again)
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ocfs2 / ocfs2_fs.h
blob7638a38c32bc61659995bb7c1d476e54f7b08963
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 #define OCFS2_FEATURE_RO_COMPAT_SUPP (OCFS2_FEATURE_RO_COMPAT_UNWRITTEN \
105 | OCFS2_FEATURE_RO_COMPAT_USRQUOTA \
106 | OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
107
108 /*
109 * Heartbeat-only devices are missing journals and other files. The
110 * filesystem driver can't load them, but the library can. Never put
111 * this in OCFS2_FEATURE_INCOMPAT_SUPP, *ever*.
112 */
113 #define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV 0x0002
114
115 /*
116 * tunefs sets this incompat flag before starting the resize and clears it
117 * at the end. This flag protects users from inadvertently mounting the fs
118 * after an aborted run without fsck-ing.
119 */
120 #define OCFS2_FEATURE_INCOMPAT_RESIZE_INPROG 0x0004
121
122 /* Used to denote a non-clustered volume */
123 #define OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT 0x0008
124
125 /* Support for sparse allocation in b-trees */
126 #define OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC 0x0010
127
128 /*
129 * Tunefs sets this incompat flag before starting an operation which
130 * would require cleanup on abort. This is done to protect users from
131 * inadvertently mounting the fs after an aborted run without
132 * fsck-ing.
133 *
134 * s_tunefs_flags on the super block describes precisely which
135 * operations were in progress.
136 */
137 #define OCFS2_FEATURE_INCOMPAT_TUNEFS_INPROG 0x0020
138
139 /* Support for data packed into inode blocks */
140 #define OCFS2_FEATURE_INCOMPAT_INLINE_DATA 0x0040
141
142 /*
143 * Support for alternate, userspace cluster stacks. If set, the superblock
144 * field s_cluster_info contains a tag for the alternate stack in use as
145 * well as the name of the cluster being joined.
146 * mount.ocfs2 must pass in a matching stack name.
147 *
148 * If not set, the classic stack will be used. This is compatbile with
149 * all older versions.
150 */
151 #define OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK 0x0080
152
153 /* Support for the extended slot map */
154 #define OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP 0x100
155
156 /* Support for extended attributes */
157 #define OCFS2_FEATURE_INCOMPAT_XATTR 0x0200
158
159 /* Support for indexed directores */
160 #define OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS 0x0400
161
162 /* Metadata checksum and error correction */
163 #define OCFS2_FEATURE_INCOMPAT_META_ECC 0x0800
164
165 /* Refcount tree support */
166 #define OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE 0x1000
167
168 /*
169 * backup superblock flag is used to indicate that this volume
170 * has backup superblocks.
171 */
172 #define OCFS2_FEATURE_COMPAT_BACKUP_SB 0x0001
173
174 /*
175 * The filesystem will correctly handle journal feature bits.
176 */
177 #define OCFS2_FEATURE_COMPAT_JBD2_SB 0x0002
178
179 /*
180 * Unwritten extents support.
181 */
182 #define OCFS2_FEATURE_RO_COMPAT_UNWRITTEN 0x0001
183
184 /*
185 * Maintain quota information for this filesystem
186 */
187 #define OCFS2_FEATURE_RO_COMPAT_USRQUOTA 0x0002
188 #define OCFS2_FEATURE_RO_COMPAT_GRPQUOTA 0x0004
189
190 /* The byte offset of the first backup block will be 1G.
191 * The following will be 4G, 16G, 64G, 256G and 1T.
192 */
193 #define OCFS2_BACKUP_SB_START 1 << 30
194
195 /* the max backup superblock nums */
196 #define OCFS2_MAX_BACKUP_SUPERBLOCKS 6
197
198 /*
199 * Flags on ocfs2_super_block.s_tunefs_flags
200 */
201 #define OCFS2_TUNEFS_INPROG_REMOVE_SLOT 0x0001 /* Removing slots */
202
203 /*
204 * Flags on ocfs2_dinode.i_flags
205 */
206 #define OCFS2_VALID_FL (0x00000001) /* Inode is valid */
207 #define OCFS2_UNUSED2_FL (0x00000002)
208 #define OCFS2_ORPHANED_FL (0x00000004) /* On the orphan list */
209 #define OCFS2_UNUSED3_FL (0x00000008)
210 /* System inode flags */
211 #define OCFS2_SYSTEM_FL (0x00000010) /* System inode */
212 #define OCFS2_SUPER_BLOCK_FL (0x00000020) /* Super block */
213 #define OCFS2_LOCAL_ALLOC_FL (0x00000040) /* Slot local alloc bitmap */
214 #define OCFS2_BITMAP_FL (0x00000080) /* Allocation bitmap */
215 #define OCFS2_JOURNAL_FL (0x00000100) /* Slot local journal */
216 #define OCFS2_HEARTBEAT_FL (0x00000200) /* Heartbeat area */
217 #define OCFS2_CHAIN_FL (0x00000400) /* Chain allocator */
218 #define OCFS2_DEALLOC_FL (0x00000800) /* Truncate log */
219 #define OCFS2_QUOTA_FL (0x00001000) /* Quota file */
220
221 /*
222 * Flags on ocfs2_dinode.i_dyn_features
223 *
224 * These can change much more often than i_flags. When adding flags,
225 * keep in mind that i_dyn_features is only 16 bits wide.
226 */
227 #define OCFS2_INLINE_DATA_FL (0x0001) /* Data stored in inode block */
228 #define OCFS2_HAS_XATTR_FL (0x0002)
229 #define OCFS2_INLINE_XATTR_FL (0x0004)
230 #define OCFS2_INDEXED_DIR_FL (0x0008)
231 #define OCFS2_HAS_REFCOUNT_FL (0x0010)
232
233 /* Inode attributes, keep in sync with EXT2 */
234 #define OCFS2_SECRM_FL (0x00000001) /* Secure deletion */
235 #define OCFS2_UNRM_FL (0x00000002) /* Undelete */
236 #define OCFS2_COMPR_FL (0x00000004) /* Compress file */
237 #define OCFS2_SYNC_FL (0x00000008) /* Synchronous updates */
238 #define OCFS2_IMMUTABLE_FL (0x00000010) /* Immutable file */
239 #define OCFS2_APPEND_FL (0x00000020) /* writes to file may only append */
240 #define OCFS2_NODUMP_FL (0x00000040) /* do not dump file */
241 #define OCFS2_NOATIME_FL (0x00000080) /* do not update atime */
242 #define OCFS2_DIRSYNC_FL (0x00010000) /* dirsync behaviour (directories only) */
243
244 #define OCFS2_FL_VISIBLE (0x000100FF) /* User visible flags */
245 #define OCFS2_FL_MODIFIABLE (0x000100FF) /* User modifiable flags */
246
247 /*
248 * Extent record flags (e_node.leaf.flags)
249 */
250 #define OCFS2_EXT_UNWRITTEN (0x01) /* Extent is allocated but
251 * unwritten */
252 #define OCFS2_EXT_REFCOUNTED (0x02) /* Extent is reference
253 * counted in an associated
254 * refcount tree */
255
256 /*
257 * ioctl commands
258 */
259 #define OCFS2_IOC_GETFLAGS _IOR('f', 1, long)
260 #define OCFS2_IOC_SETFLAGS _IOW('f', 2, long)
261 #define OCFS2_IOC32_GETFLAGS _IOR('f', 1, int)
262 #define OCFS2_IOC32_SETFLAGS _IOW('f', 2, int)
263
264 /*
265 * Space reservation / allocation / free ioctls and argument structure
266 * are designed to be compatible with XFS.
267 *
268 * ALLOCSP* and FREESP* are not and will never be supported, but are
269 * included here for completeness.
270 */
271 struct ocfs2_space_resv {
272 __s16 l_type;
273 __s16 l_whence;
274 __s64 l_start;
275 __s64 l_len; /* len == 0 means until end of file */
276 __s32 l_sysid;
277 __u32 l_pid;
278 __s32 l_pad[4]; /* reserve area */
279 };
280
281 #define OCFS2_IOC_ALLOCSP _IOW ('X', 10, struct ocfs2_space_resv)
282 #define OCFS2_IOC_FREESP _IOW ('X', 11, struct ocfs2_space_resv)
283 #define OCFS2_IOC_RESVSP _IOW ('X', 40, struct ocfs2_space_resv)
284 #define OCFS2_IOC_UNRESVSP _IOW ('X', 41, struct ocfs2_space_resv)
285 #define OCFS2_IOC_ALLOCSP64 _IOW ('X', 36, struct ocfs2_space_resv)
286 #define OCFS2_IOC_FREESP64 _IOW ('X', 37, struct ocfs2_space_resv)
287 #define OCFS2_IOC_RESVSP64 _IOW ('X', 42, struct ocfs2_space_resv)
288 #define OCFS2_IOC_UNRESVSP64 _IOW ('X', 43, struct ocfs2_space_resv)
289
290 /* Used to pass group descriptor data when online resize is done */
291 struct ocfs2_new_group_input {
292 __u64 group; /* Group descriptor's blkno. */
293 __u32 clusters; /* Total number of clusters in this group */
294 __u32 frees; /* Total free clusters in this group */
295 __u16 chain; /* Chain for this group */
296 __u16 reserved1;
297 __u32 reserved2;
298 };
299
300 #define OCFS2_IOC_GROUP_EXTEND _IOW('o', 1, int)
301 #define OCFS2_IOC_GROUP_ADD _IOW('o', 2,struct ocfs2_new_group_input)
302 #define OCFS2_IOC_GROUP_ADD64 _IOW('o', 3,struct ocfs2_new_group_input)
303
304 /* Used to pass 2 file names to reflink. */
305 struct reflink_arguments {
306 __u64 old_path;
307 __u64 new_path;
308 __u64 preserve;
309 };
310 #define OCFS2_IOC_REFLINK _IOW('o', 4, struct reflink_arguments)
311
312
313 /*
314 * Journal Flags (ocfs2_dinode.id1.journal1.i_flags)
315 */
316 #define OCFS2_JOURNAL_DIRTY_FL (0x00000001) /* Journal needs recovery */
317
318 /*
319 * superblock s_state flags
320 */
321 #define OCFS2_ERROR_FS (0x00000001) /* FS saw errors */
322
323 /* Limit of space in ocfs2_dir_entry */
324 #define OCFS2_MAX_FILENAME_LEN 255
325
326 /* Maximum slots on an ocfs2 file system */
327 #define OCFS2_MAX_SLOTS 255
328
329 /* Slot map indicator for an empty slot */
330 #define OCFS2_INVALID_SLOT -1
331
332 #define OCFS2_VOL_UUID_LEN 16
333 #define OCFS2_MAX_VOL_LABEL_LEN 64
334
335 /* The alternate, userspace stack fields */
336 #define OCFS2_STACK_LABEL_LEN 4
337 #define OCFS2_CLUSTER_NAME_LEN 16
338
339 /* Journal limits (in bytes) */
340 #define OCFS2_MIN_JOURNAL_SIZE (4 * 1024 * 1024)
341
342 /*
343 * Default local alloc size (in megabytes)
344 *
345 * The value chosen should be such that most allocations, including new
346 * block groups, use local alloc.
347 */
348 #define OCFS2_DEFAULT_LOCAL_ALLOC_SIZE 8
349
350 /*
351 * Inline extended attribute size (in bytes)
352 * The value chosen should be aligned to 16 byte boundaries.
353 */
354 #define OCFS2_MIN_XATTR_INLINE_SIZE 256
355
356 struct ocfs2_system_inode_info {
357 char *si_name;
358 int si_iflags;
359 int si_mode;
360 };
361
362 /* System file index */
363 enum {
364 BAD_BLOCK_SYSTEM_INODE = 0,
365 GLOBAL_INODE_ALLOC_SYSTEM_INODE,
366 SLOT_MAP_SYSTEM_INODE,
367 #define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE
368 HEARTBEAT_SYSTEM_INODE,
369 GLOBAL_BITMAP_SYSTEM_INODE,
370 USER_QUOTA_SYSTEM_INODE,
371 GROUP_QUOTA_SYSTEM_INODE,
372 #define OCFS2_LAST_GLOBAL_SYSTEM_INODE GROUP_QUOTA_SYSTEM_INODE
373 ORPHAN_DIR_SYSTEM_INODE,
374 EXTENT_ALLOC_SYSTEM_INODE,
375 INODE_ALLOC_SYSTEM_INODE,
376 JOURNAL_SYSTEM_INODE,
377 LOCAL_ALLOC_SYSTEM_INODE,
378 TRUNCATE_LOG_SYSTEM_INODE,
379 LOCAL_USER_QUOTA_SYSTEM_INODE,
380 LOCAL_GROUP_QUOTA_SYSTEM_INODE,
381 NUM_SYSTEM_INODES
382 };
383
384 static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = {
385 /* Global system inodes (single copy) */
386 /* The first two are only used from userspace mfks/tunefs */
387 [BAD_BLOCK_SYSTEM_INODE] = { "bad_blocks", 0, S_IFREG | 0644 },
388 [GLOBAL_INODE_ALLOC_SYSTEM_INODE] = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
389
390 /* These are used by the running filesystem */
391 [SLOT_MAP_SYSTEM_INODE] = { "slot_map", 0, S_IFREG | 0644 },
392 [HEARTBEAT_SYSTEM_INODE] = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 },
393 [GLOBAL_BITMAP_SYSTEM_INODE] = { "global_bitmap", 0, S_IFREG | 0644 },
394 [USER_QUOTA_SYSTEM_INODE] = { "aquota.user", OCFS2_QUOTA_FL, S_IFREG | 0644 },
395 [GROUP_QUOTA_SYSTEM_INODE] = { "aquota.group", OCFS2_QUOTA_FL, S_IFREG | 0644 },
396
397 /* Slot-specific system inodes (one copy per slot) */
398 [ORPHAN_DIR_SYSTEM_INODE] = { "orphan_dir:%04d", 0, S_IFDIR | 0755 },
399 [EXTENT_ALLOC_SYSTEM_INODE] = { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
400 [INODE_ALLOC_SYSTEM_INODE] = { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
401 [JOURNAL_SYSTEM_INODE] = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 },
402 [LOCAL_ALLOC_SYSTEM_INODE] = { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 },
403 [TRUNCATE_LOG_SYSTEM_INODE] = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 },
404 [LOCAL_USER_QUOTA_SYSTEM_INODE] = { "aquota.user:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 },
405 [LOCAL_GROUP_QUOTA_SYSTEM_INODE] = { "aquota.group:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 },
406 };
407
408 /* Parameter passed from mount.ocfs2 to module */
409 #define OCFS2_HB_NONE "heartbeat=none"
410 #define OCFS2_HB_LOCAL "heartbeat=local"
411
412 /*
413 * OCFS2 directory file types. Only the low 3 bits are used. The
414 * other bits are reserved for now.
415 */
416 #define OCFS2_FT_UNKNOWN 0
417 #define OCFS2_FT_REG_FILE 1
418 #define OCFS2_FT_DIR 2
419 #define OCFS2_FT_CHRDEV 3
420 #define OCFS2_FT_BLKDEV 4
421 #define OCFS2_FT_FIFO 5
422 #define OCFS2_FT_SOCK 6
423 #define OCFS2_FT_SYMLINK 7
424
425 #define OCFS2_FT_MAX 8
426
427 /*
428 * OCFS2_DIR_PAD defines the directory entries boundaries
429 *
430 * NOTE: It must be a multiple of 4
431 */
432 #define OCFS2_DIR_PAD 4
433 #define OCFS2_DIR_ROUND (OCFS2_DIR_PAD - 1)
434 #define OCFS2_DIR_MEMBER_LEN offsetof(struct ocfs2_dir_entry, name)
435 #define OCFS2_DIR_REC_LEN(name_len) (((name_len) + OCFS2_DIR_MEMBER_LEN + \
436 OCFS2_DIR_ROUND) & \
437 ~OCFS2_DIR_ROUND)
438 #define OCFS2_DIR_MIN_REC_LEN OCFS2_DIR_REC_LEN(1)
439
440 #define OCFS2_LINK_MAX 32000
441 #define OCFS2_DX_LINK_MAX ((1U << 31) - 1U)
442 #define OCFS2_LINKS_HI_SHIFT 16
443 #define OCFS2_DX_ENTRIES_MAX (0xffffffffU)
444
445 #define S_SHIFT 12
446 static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = {
447 [S_IFREG >> S_SHIFT] = OCFS2_FT_REG_FILE,
448 [S_IFDIR >> S_SHIFT] = OCFS2_FT_DIR,
449 [S_IFCHR >> S_SHIFT] = OCFS2_FT_CHRDEV,
450 [S_IFBLK >> S_SHIFT] = OCFS2_FT_BLKDEV,
451 [S_IFIFO >> S_SHIFT] = OCFS2_FT_FIFO,
452 [S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK,
453 [S_IFLNK >> S_SHIFT] = OCFS2_FT_SYMLINK,
454 };
455
456
457 /*
458 * Convenience casts
459 */
460 #define OCFS2_RAW_SB(dinode) (&((dinode)->id2.i_super))
461
462 /*
463 * Block checking structure. This is used in metadata to validate the
464 * contents. If OCFS2_FEATURE_INCOMPAT_META_ECC is not set, it is all
465 * zeros.
466 */
467 struct ocfs2_block_check {
468 /*00*/ __le32 bc_crc32e; /* 802.3 Ethernet II CRC32 */
469 __le16 bc_ecc; /* Single-error-correction parity vector.
470 This is a simple Hamming code dependant
471 on the blocksize. OCFS2's maximum
472 blocksize, 4K, requires 16 parity bits,
473 so we fit in __le16. */
474 __le16 bc_reserved1;
475 /*08*/
476 };
477
478 /*
479 * On disk extent record for OCFS2
480 * It describes a range of clusters on disk.
481 *
482 * Length fields are divided into interior and leaf node versions.
483 * This leaves room for a flags field (OCFS2_EXT_*) in the leaf nodes.
484 */
485 struct ocfs2_extent_rec {
486 /*00*/ __le32 e_cpos; /* Offset into the file, in clusters */
487 union {
488 __le32 e_int_clusters; /* Clusters covered by all children */
489 struct {
490 __le16 e_leaf_clusters; /* Clusters covered by this
491 extent */
492 __u8 e_reserved1;
493 __u8 e_flags; /* Extent flags */
494 };
495 };
496 __le64 e_blkno; /* Physical disk offset, in blocks */
497 /*10*/
498 };
499
500 struct ocfs2_chain_rec {
501 __le32 c_free; /* Number of free bits in this chain. */
502 __le32 c_total; /* Number of total bits in this chain */
503 __le64 c_blkno; /* Physical disk offset (blocks) of 1st group */
504 };
505
506 struct ocfs2_truncate_rec {
507 __le32 t_start; /* 1st cluster in this log */
508 __le32 t_clusters; /* Number of total clusters covered */
509 };
510
511 /*
512 * On disk extent list for OCFS2 (node in the tree). Note that this
513 * is contained inside ocfs2_dinode or ocfs2_extent_block, so the
514 * offsets are relative to ocfs2_dinode.id2.i_list or
515 * ocfs2_extent_block.h_list, respectively.
516 */
517 struct ocfs2_extent_list {
518 /*00*/ __le16 l_tree_depth; /* Extent tree depth from this
519 point. 0 means data extents
520 hang directly off this
521 header (a leaf)
522 NOTE: The high 8 bits cannot be
523 used - tree_depth is never that big.
524 */
525 __le16 l_count; /* Number of extent records */
526 __le16 l_next_free_rec; /* Next unused extent slot */
527 __le16 l_reserved1;
528 __le64 l_reserved2; /* Pad to
529 sizeof(ocfs2_extent_rec) */
530 /*10*/ struct ocfs2_extent_rec l_recs[0]; /* Extent records */
531 };
532
533 /*
534 * On disk allocation chain list for OCFS2. Note that this is
535 * contained inside ocfs2_dinode, so the offsets are relative to
536 * ocfs2_dinode.id2.i_chain.
537 */
538 struct ocfs2_chain_list {
539 /*00*/ __le16 cl_cpg; /* Clusters per Block Group */
540 __le16 cl_bpc; /* Bits per cluster */
541 __le16 cl_count; /* Total chains in this list */
542 __le16 cl_next_free_rec; /* Next unused chain slot */
543 __le64 cl_reserved1;
544 /*10*/ struct ocfs2_chain_rec cl_recs[0]; /* Chain records */
545 };
546
547 /*
548 * On disk deallocation log for OCFS2. Note that this is
549 * contained inside ocfs2_dinode, so the offsets are relative to
550 * ocfs2_dinode.id2.i_dealloc.
551 */
552 struct ocfs2_truncate_log {
553 /*00*/ __le16 tl_count; /* Total records in this log */
554 __le16 tl_used; /* Number of records in use */
555 __le32 tl_reserved1;
556 /*08*/ struct ocfs2_truncate_rec tl_recs[0]; /* Truncate records */
557 };
558
559 /*
560 * On disk extent block (indirect block) for OCFS2
561 */
562 struct ocfs2_extent_block
563 {
564 /*00*/ __u8 h_signature[8]; /* Signature for verification */
565 struct ocfs2_block_check h_check; /* Error checking */
566 /*10*/ __le16 h_suballoc_slot; /* Slot suballocator this
567 extent_header belongs to */
568 __le16 h_suballoc_bit; /* Bit offset in suballocator
569 block group */
570 __le32 h_fs_generation; /* Must match super block */
571 __le64 h_blkno; /* Offset on disk, in blocks */
572 /*20*/ __le64 h_reserved3;
573 __le64 h_next_leaf_blk; /* Offset on disk, in blocks,
574 of next leaf header pointing
575 to data */
576 /*30*/ struct ocfs2_extent_list h_list; /* Extent record list */
577 /* Actual on-disk size is one block */
578 };
579
580 /*
581 * On disk slot map for OCFS2. This defines the contents of the "slot_map"
582 * system file. A slot is valid if it contains a node number >= 0. The
583 * value -1 (0xFFFF) is OCFS2_INVALID_SLOT. This marks a slot empty.
584 */
585 struct ocfs2_slot_map {
586 /*00*/ __le16 sm_slots[0];
587 /*
588 * Actual on-disk size is one block. OCFS2_MAX_SLOTS is 255,
589 * 255 * sizeof(__le16) == 512B, within the 512B block minimum blocksize.
590 */
591 };
592
593 struct ocfs2_extended_slot {
594 /*00*/ __u8 es_valid;
595 __u8 es_reserved1[3];
596 __le32 es_node_num;
597 /*10*/
598 };
599
600 /*
601 * The extended slot map, used when OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP
602 * is set. It separates out the valid marker from the node number, and
603 * has room to grow. Unlike the old slot map, this format is defined by
604 * i_size.
605 */
606 struct ocfs2_slot_map_extended {
607 /*00*/ struct ocfs2_extended_slot se_slots[0];
608 /*
609 * Actual size is i_size of the slot_map system file. It should
610 * match s_max_slots * sizeof(struct ocfs2_extended_slot)
611 */
612 };
613
614 struct ocfs2_cluster_info {
615 /*00*/ __u8 ci_stack[OCFS2_STACK_LABEL_LEN];
616 __le32 ci_reserved;
617 /*08*/ __u8 ci_cluster[OCFS2_CLUSTER_NAME_LEN];
618 /*18*/
619 };
620
621 /*
622 * On disk superblock for OCFS2
623 * Note that it is contained inside an ocfs2_dinode, so all offsets
624 * are relative to the start of ocfs2_dinode.id2.
625 */
626 struct ocfs2_super_block {
627 /*00*/ __le16 s_major_rev_level;
628 __le16 s_minor_rev_level;
629 __le16 s_mnt_count;
630 __le16 s_max_mnt_count;
631 __le16 s_state; /* File system state */
632 __le16 s_errors; /* Behaviour when detecting errors */
633 __le32 s_checkinterval; /* Max time between checks */
634 /*10*/ __le64 s_lastcheck; /* Time of last check */
635 __le32 s_creator_os; /* OS */
636 __le32 s_feature_compat; /* Compatible feature set */
637 /*20*/ __le32 s_feature_incompat; /* Incompatible feature set */
638 __le32 s_feature_ro_compat; /* Readonly-compatible feature set */
639 __le64 s_root_blkno; /* Offset, in blocks, of root directory
640 dinode */
641 /*30*/ __le64 s_system_dir_blkno; /* Offset, in blocks, of system
642 directory dinode */
643 __le32 s_blocksize_bits; /* Blocksize for this fs */
644 __le32 s_clustersize_bits; /* Clustersize for this fs */
645 /*40*/ __le16 s_max_slots; /* Max number of simultaneous mounts
646 before tunefs required */
647 __le16 s_tunefs_flag;
648 __le32 s_uuid_hash; /* hash value of uuid */
649 __le64 s_first_cluster_group; /* Block offset of 1st cluster
650 * group header */
651 /*50*/ __u8 s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */
652 /*90*/ __u8 s_uuid[OCFS2_VOL_UUID_LEN]; /* 128-bit uuid */
653 /*A0*/ struct ocfs2_cluster_info s_cluster_info; /* Selected userspace
654 stack. Only valid
655 with INCOMPAT flag. */
656 /*B8*/ __le16 s_xattr_inline_size; /* extended attribute inline size
657 for this fs*/
658 __le16 s_reserved0;
659 __le32 s_dx_seed[3]; /* seed[0-2] for dx dir hash.
660 * s_uuid_hash serves as seed[3]. */
661 /*C0*/ __le64 s_reserved2[15]; /* Fill out superblock */
662 /*140*/
663
664 /*
665 * NOTE: As stated above, all offsets are relative to
666 * ocfs2_dinode.id2, which is at 0xC0 in the inode.
667 * 0xC0 + 0x140 = 0x200 or 512 bytes. A superblock must fit within
668 * our smallest blocksize, which is 512 bytes. To ensure this,
669 * we reserve the space in s_reserved2. Anything past s_reserved2
670 * will not be available on the smallest blocksize.
671 */
672 };
673
674 /*
675 * Local allocation bitmap for OCFS2 slots
676 * Note that it exists inside an ocfs2_dinode, so all offsets are
677 * relative to the start of ocfs2_dinode.id2.
678 */
679 struct ocfs2_local_alloc
680 {
681 /*00*/ __le32 la_bm_off; /* Starting bit offset in main bitmap */
682 __le16 la_size; /* Size of included bitmap, in bytes */
683 __le16 la_reserved1;
684 __le64 la_reserved2;
685 /*10*/ __u8 la_bitmap[0];
686 };
687
688 /*
689 * Data-in-inode header. This is only used if i_dyn_features has
690 * OCFS2_INLINE_DATA_FL set.
691 */
692 struct ocfs2_inline_data
693 {
694 /*00*/ __le16 id_count; /* Number of bytes that can be used
695 * for data, starting at id_data */
696 __le16 id_reserved0;
697 __le32 id_reserved1;
698 __u8 id_data[0]; /* Start of user data */
699 };
700
701 /*
702 * On disk inode for OCFS2
703 */
704 struct ocfs2_dinode {
705 /*00*/ __u8 i_signature[8]; /* Signature for validation */
706 __le32 i_generation; /* Generation number */
707 __le16 i_suballoc_slot; /* Slot suballocator this inode
708 belongs to */
709 __le16 i_suballoc_bit; /* Bit offset in suballocator
710 block group */
711 /*10*/ __le16 i_links_count_hi; /* High 16 bits of links count */
712 __le16 i_xattr_inline_size;
713 __le32 i_clusters; /* Cluster count */
714 __le32 i_uid; /* Owner UID */
715 __le32 i_gid; /* Owning GID */
716 /*20*/ __le64 i_size; /* Size in bytes */
717 __le16 i_mode; /* File mode */
718 __le16 i_links_count; /* Links count */
719 __le32 i_flags; /* File flags */
720 /*30*/ __le64 i_atime; /* Access time */
721 __le64 i_ctime; /* Creation time */
722 /*40*/ __le64 i_mtime; /* Modification time */
723 __le64 i_dtime; /* Deletion time */
724 /*50*/ __le64 i_blkno; /* Offset on disk, in blocks */
725 __le64 i_last_eb_blk; /* Pointer to last extent
726 block */
727 /*60*/ __le32 i_fs_generation; /* Generation per fs-instance */
728 __le32 i_atime_nsec;
729 __le32 i_ctime_nsec;
730 __le32 i_mtime_nsec;
731 /*70*/ __le32 i_attr;
732 __le16 i_orphaned_slot; /* Only valid when OCFS2_ORPHANED_FL
733 was set in i_flags */
734 __le16 i_dyn_features;
735 __le64 i_xattr_loc;
736 /*80*/ struct ocfs2_block_check i_check; /* Error checking */
737 /*88*/ __le64 i_dx_root; /* Pointer to dir index root block */
738 /*90*/ __le64 i_refcount_loc;
739 __le64 i_reserved2[4];
740 /*B8*/ union {
741 __le64 i_pad1; /* Generic way to refer to this
742 64bit union */
743 struct {
744 __le64 i_rdev; /* Device number */
745 } dev1;
746 struct { /* Info for bitmap system
747 inodes */
748 __le32 i_used; /* Bits (ie, clusters) used */
749 __le32 i_total; /* Total bits (clusters)
750 available */
751 } bitmap1;
752 struct { /* Info for journal system
753 inodes */
754 __le32 ij_flags; /* Mounted, version, etc. */
755 __le32 ij_recovery_generation; /* Incremented when the
756 journal is recovered
757 after an unclean
758 shutdown */
759 } journal1;
760 } id1; /* Inode type dependant 1 */
761 /*C0*/ union {
762 struct ocfs2_super_block i_super;
763 struct ocfs2_local_alloc i_lab;
764 struct ocfs2_chain_list i_chain;
765 struct ocfs2_extent_list i_list;
766 struct ocfs2_truncate_log i_dealloc;
767 struct ocfs2_inline_data i_data;
768 __u8 i_symlink[0];
769 } id2;
770 /* Actual on-disk size is one block */
771 };
772
773 /*
774 * On-disk directory entry structure for OCFS2
775 *
776 * Packed as this structure could be accessed unaligned on 64-bit platforms
777 */
778 struct ocfs2_dir_entry {
779 /*00*/ __le64 inode; /* Inode number */
780 __le16 rec_len; /* Directory entry length */
781 __u8 name_len; /* Name length */
782 __u8 file_type;
783 /*0C*/ char name[OCFS2_MAX_FILENAME_LEN]; /* File name */
784 /* Actual on-disk length specified by rec_len */
785 } __attribute__ ((packed));
786
787 /*
788 * Per-block record for the unindexed directory btree. This is carefully
789 * crafted so that the rec_len and name_len records of an ocfs2_dir_entry are
790 * mirrored. That way, the directory manipulation code needs a minimal amount
791 * of update.
792 *
793 * NOTE: Keep this structure aligned to a multiple of 4 bytes.
794 */
795 struct ocfs2_dir_block_trailer {
796 /*00*/ __le64 db_compat_inode; /* Always zero. Was inode */
797
798 __le16 db_compat_rec_len; /* Backwards compatible with
799 * ocfs2_dir_entry. */
800 __u8 db_compat_name_len; /* Always zero. Was name_len */
801 __u8 db_reserved0;
802 __le16 db_reserved1;
803 __le16 db_free_rec_len; /* Size of largest empty hole
804 * in this block. (unused) */
805 /*10*/ __u8 db_signature[8]; /* Signature for verification */
806 __le64 db_reserved2;
807 __le64 db_free_next; /* Next block in list (unused) */
808 /*20*/ __le64 db_blkno; /* Offset on disk, in blocks */
809 __le64 db_parent_dinode; /* dinode which owns me, in
810 blocks */
811 /*30*/ struct ocfs2_block_check db_check; /* Error checking */
812 /*40*/
813 };
814
815 /*
816 * A directory entry in the indexed tree. We don't store the full name here,
817 * but instead provide a pointer to the full dirent in the unindexed tree.
818 *
819 * We also store name_len here so as to reduce the number of leaf blocks we
820 * need to search in case of collisions.
821 */
822 struct ocfs2_dx_entry {
823 __le32 dx_major_hash; /* Used to find logical
824 * cluster in index */
825 __le32 dx_minor_hash; /* Lower bits used to find
826 * block in cluster */
827 __le64 dx_dirent_blk; /* Physical block in unindexed
828 * tree holding this dirent. */
829 };
830
831 struct ocfs2_dx_entry_list {
832 __le32 de_reserved;
833 __le16 de_count; /* Maximum number of entries
834 * possible in de_entries */
835 __le16 de_num_used; /* Current number of
836 * de_entries entries */
837 struct ocfs2_dx_entry de_entries[0]; /* Indexed dir entries
838 * in a packed array of
839 * length de_num_used */
840 };
841
842 #define OCFS2_DX_FLAG_INLINE 0x01
843
844 /*
845 * A directory indexing block. Each indexed directory has one of these,
846 * pointed to by ocfs2_dinode.
847 *
848 * This block stores an indexed btree root, and a set of free space
849 * start-of-list pointers.
850 */
851 struct ocfs2_dx_root_block {
852 __u8 dr_signature[8]; /* Signature for verification */
853 struct ocfs2_block_check dr_check; /* Error checking */
854 __le16 dr_suballoc_slot; /* Slot suballocator this
855 * block belongs to. */
856 __le16 dr_suballoc_bit; /* Bit offset in suballocator
857 * block group */
858 __le32 dr_fs_generation; /* Must match super block */
859 __le64 dr_blkno; /* Offset on disk, in blocks */
860 __le64 dr_last_eb_blk; /* Pointer to last
861 * extent block */
862 __le32 dr_clusters; /* Clusters allocated
863 * to the indexed tree. */
864 __u8 dr_flags; /* OCFS2_DX_FLAG_* flags */
865 __u8 dr_reserved0;
866 __le16 dr_reserved1;
867 __le64 dr_dir_blkno; /* Pointer to parent inode */
868 __le32 dr_num_entries; /* Total number of
869 * names stored in
870 * this directory.*/
871 __le32 dr_reserved2;
872 __le64 dr_free_blk; /* Pointer to head of free
873 * unindexed block list. */
874 __le64 dr_reserved3[15];
875 union {
876 struct ocfs2_extent_list dr_list; /* Keep this aligned to 128
877 * bits for maximum space
878 * efficiency. */
879 struct ocfs2_dx_entry_list dr_entries; /* In-root-block list of
880 * entries. We grow out
881 * to extents if this
882 * gets too big. */
883 };
884 };
885
886 /*
887 * The header of a leaf block in the indexed tree.
888 */
889 struct ocfs2_dx_leaf {
890 __u8 dl_signature[8];/* Signature for verification */
891 struct ocfs2_block_check dl_check; /* Error checking */
892 __le64 dl_blkno; /* Offset on disk, in blocks */
893 __le32 dl_fs_generation;/* Must match super block */
894 __le32 dl_reserved0;
895 __le64 dl_reserved1;
896 struct ocfs2_dx_entry_list dl_list;
897 };
898
899 /*
900 * On disk allocator group structure for OCFS2
901 */
902 struct ocfs2_group_desc
903 {
904 /*00*/ __u8 bg_signature[8]; /* Signature for validation */
905 __le16 bg_size; /* Size of included bitmap in
906 bytes. */
907 __le16 bg_bits; /* Bits represented by this
908 group. */
909 __le16 bg_free_bits_count; /* Free bits count */
910 __le16 bg_chain; /* What chain I am in. */
911 /*10*/ __le32 bg_generation;
912 __le32 bg_reserved1;
913 __le64 bg_next_group; /* Next group in my list, in
914 blocks */
915 /*20*/ __le64 bg_parent_dinode; /* dinode which owns me, in
916 blocks */
917 __le64 bg_blkno; /* Offset on disk, in blocks */
918 /*30*/ struct ocfs2_block_check bg_check; /* Error checking */
919 __le64 bg_reserved2;
920 /*40*/ __u8 bg_bitmap[0];
921 };
922
923 struct ocfs2_refcount_rec {
924 /*00*/ __le64 r_cpos; /* Physical offset, in clusters */
925 __le32 r_clusters; /* Clusters covered by this extent */
926 __le32 r_refcount; /* Reference count of this extent */
927 /*10*/
928 };
929 #define OCFS2_32BIT_POS_MASK (0xffffffffULL)
930
931 #define OCFS2_REFCOUNT_LEAF_FL (0x00000001)
932 #define OCFS2_REFCOUNT_TREE_FL (0x00000002)
933
934 struct ocfs2_refcount_list {
935 /*00*/ __le16 rl_count; /* Maximum number of entries possible
936 in rl_records */
937 __le16 rl_used; /* Current number of used records */
938 __le32 rl_reserved2;
939 __le64 rl_reserved1; /* Pad to sizeof(ocfs2_refcount_record) */
940 /*10*/ struct ocfs2_refcount_rec rl_recs[0]; /* Refcount records */
941 };
942
943
944 struct ocfs2_refcount_block {
945 /*00*/ __u8 rf_signature[8]; /* Signature for verification */
946 __le16 rf_suballoc_slot; /* Slot suballocator this block
947 belongs to */
948 __le16 rf_suballoc_bit; /* Bit offset in suballocator
949 block group */
950 __le32 rf_fs_generation; /* Must match superblock */
951 /*10*/ __le64 rf_blkno; /* Offset on disk, in blocks */
952 __le64 rf_parent; /* Parent block, only valid if
953 OCFS2_REFCOUNT_LEAF_FL is set in
954 rf_flags */
955 /*20*/ struct ocfs2_block_check rf_check; /* Error checking */
956 __le64 rf_last_eb_blk; /* Pointer to last extent block */
957 /*30*/ __le32 rf_count; /* Number of inodes sharing this
958 refcount tree */
959 __le32 rf_flags; /* See the flags above */
960 __le32 rf_clusters; /* clusters covered by refcount tree. */
961 __le32 rf_cpos; /* cluster offset in refcount tree.*/
962 /*40*/ __le32 rf_generation; /* generation number. all be the same
963 * for the same refcount tree. */
964 __le32 rf_reserved0;
965 __le64 rf_reserved1[7];
966 /*80*/ union {
967 struct ocfs2_refcount_list rf_records; /* List of refcount
968 records */
969 struct ocfs2_extent_list rf_list; /* Extent record list,
970 only valid if
971 OCFS2_REFCOUNT_TREE_FL
972 is set in rf_flags */
973 };
974 /* Actual on-disk size is one block */
975 };
976
977 /*
978 * On disk extended attribute structure for OCFS2.
979 */
980
981 /*
982 * ocfs2_xattr_entry indicates one extend attribute.
983 *
984 * Note that it can be stored in inode, one block or one xattr bucket.
985 */
986 struct ocfs2_xattr_entry {
987 __le32 xe_name_hash; /* hash value of xattr prefix+suffix. */
988 __le16 xe_name_offset; /* byte offset from the 1st entry in the
989 local xattr storage(inode, xattr block or
990 xattr bucket). */
991 __u8 xe_name_len; /* xattr name len, does't include prefix. */
992 __u8 xe_type; /* the low 7 bits indicate the name prefix
993 * type and the highest bit indicates whether
994 * the EA is stored in the local storage. */
995 __le64 xe_value_size; /* real xattr value length. */
996 };
997
998 /*
999 * On disk structure for xattr header.
1000 *
1001 * One ocfs2_xattr_header describes how many ocfs2_xattr_entry records in
1002 * the local xattr storage.
1003 */
1004 struct ocfs2_xattr_header {
1005 __le16 xh_count; /* contains the count of how
1006 many records are in the
1007 local xattr storage. */
1008 __le16 xh_free_start; /* current offset for storing
1009 xattr. */
1010 __le16 xh_name_value_len; /* total length of name/value
1011 length in this bucket. */
1012 __le16 xh_num_buckets; /* Number of xattr buckets
1013 in this extent record,
1014 only valid in the first
1015 bucket. */
1016 struct ocfs2_block_check xh_check; /* Error checking
1017 (Note, this is only
1018 used for xattr
1019 buckets. A block uses
1020 xb_check and sets
1021 this field to zero.) */
1022 struct ocfs2_xattr_entry xh_entries[0]; /* xattr entry list. */
1023 };
1024
1025 /*
1026 * On disk structure for xattr value root.
1027 *
1028 * When an xattr's value is large enough, it is stored in an external
1029 * b-tree like file data. The xattr value root points to this structure.
1030 */
1031 struct ocfs2_xattr_value_root {
1032 /*00*/ __le32 xr_clusters; /* clusters covered by xattr value. */
1033 __le32 xr_reserved0;
1034 __le64 xr_last_eb_blk; /* Pointer to last extent block */
1035 /*10*/ struct ocfs2_extent_list xr_list; /* Extent record list */
1036 };
1037
1038 /*
1039 * On disk structure for xattr tree root.
1040 *
1041 * It is used when there are too many extended attributes for one file. These
1042 * attributes will be organized and stored in an indexed-btree.
1043 */
1044 struct ocfs2_xattr_tree_root {
1045 /*00*/ __le32 xt_clusters; /* clusters covered by xattr. */
1046 __le32 xt_reserved0;
1047 __le64 xt_last_eb_blk; /* Pointer to last extent block */
1048 /*10*/ struct ocfs2_extent_list xt_list; /* Extent record list */
1049 };
1050
1051 #define OCFS2_XATTR_INDEXED 0x1
1052 #define OCFS2_HASH_SHIFT 5
1053 #define OCFS2_XATTR_ROUND 3
1054 #define OCFS2_XATTR_SIZE(size) (((size) + OCFS2_XATTR_ROUND) & \
1055 ~(OCFS2_XATTR_ROUND))
1056
1057 #define OCFS2_XATTR_BUCKET_SIZE 4096
1058 #define OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET (OCFS2_XATTR_BUCKET_SIZE \
1059 / OCFS2_MIN_BLOCKSIZE)
1060
1061 /*
1062 * On disk structure for xattr block.
1063 */
1064 struct ocfs2_xattr_block {
1065 /*00*/ __u8 xb_signature[8]; /* Signature for verification */
1066 __le16 xb_suballoc_slot; /* Slot suballocator this
1067 block belongs to. */
1068 __le16 xb_suballoc_bit; /* Bit offset in suballocator
1069 block group */
1070 __le32 xb_fs_generation; /* Must match super block */
1071 /*10*/ __le64 xb_blkno; /* Offset on disk, in blocks */
1072 struct ocfs2_block_check xb_check; /* Error checking */
1073 /*20*/ __le16 xb_flags; /* Indicates whether this block contains
1074 real xattr or a xattr tree. */
1075 __le16 xb_reserved0;
1076 __le32 xb_reserved1;
1077 __le64 xb_reserved2;
1078 /*30*/ union {
1079 struct ocfs2_xattr_header xb_header; /* xattr header if this
1080 block contains xattr */
1081 struct ocfs2_xattr_tree_root xb_root;/* xattr tree root if this
1082 block cotains xattr
1083 tree. */
1084 } xb_attrs;
1085 };
1086
1087 #define OCFS2_XATTR_ENTRY_LOCAL 0x80
1088 #define OCFS2_XATTR_TYPE_MASK 0x7F
1089 static inline void ocfs2_xattr_set_local(struct ocfs2_xattr_entry *xe,
1090 int local)
1091 {
1092 if (local)
1093 xe->xe_type |= OCFS2_XATTR_ENTRY_LOCAL;
1094 else
1095 xe->xe_type &= ~OCFS2_XATTR_ENTRY_LOCAL;
1096 }
1097
1098 static inline int ocfs2_xattr_is_local(struct ocfs2_xattr_entry *xe)
1099 {
1100 return xe->xe_type & OCFS2_XATTR_ENTRY_LOCAL;
1101 }
1102
1103 static inline void ocfs2_xattr_set_type(struct ocfs2_xattr_entry *xe, int type)
1104 {
1105 xe->xe_type |= type & OCFS2_XATTR_TYPE_MASK;
1106 }
1107
1108 static inline int ocfs2_xattr_get_type(struct ocfs2_xattr_entry *xe)
1109 {
1110 return xe->xe_type & OCFS2_XATTR_TYPE_MASK;
1111 }
1112
1113 /*
1114 * On disk structures for global quota file
1115 */
1116
1117 /* Magic numbers and known versions for global quota files */
1118 #define OCFS2_GLOBAL_QMAGICS {\
1119 0x0cf52470, /* USRQUOTA */ \
1120 0x0cf52471 /* GRPQUOTA */ \
1121 }
1122
1123 #define OCFS2_GLOBAL_QVERSIONS {\
1124 0, \
1125 0, \
1126 }
1127
1128
1129 /* Each block of each quota file has a certain fixed number of bytes reserved
1130 * for OCFS2 internal use at its end. OCFS2 can use it for things like
1131 * checksums, etc. */
1132 #define OCFS2_QBLK_RESERVED_SPACE 8
1133
1134 /* Generic header of all quota files */
1135 struct ocfs2_disk_dqheader {
1136 __le32 dqh_magic; /* Magic number identifying file */
1137 __le32 dqh_version; /* Quota format version */
1138 };
1139
1140 #define OCFS2_GLOBAL_INFO_OFF (sizeof(struct ocfs2_disk_dqheader))
1141
1142 /* Information header of global quota file (immediately follows the generic
1143 * header) */
1144 struct ocfs2_global_disk_dqinfo {
1145 /*00*/ __le32 dqi_bgrace; /* Grace time for space softlimit excess */
1146 __le32 dqi_igrace; /* Grace time for inode softlimit excess */
1147 __le32 dqi_syncms; /* Time after which we sync local changes to
1148 * global quota file */
1149 __le32 dqi_blocks; /* Number of blocks in quota file */
1150 /*10*/ __le32 dqi_free_blk; /* First free block in quota file */
1151 __le32 dqi_free_entry; /* First block with free dquot entry in quota
1152 * file */
1153 };
1154
1155 /* Structure with global user / group information. We reserve some space
1156 * for future use. */
1157 struct ocfs2_global_disk_dqblk {
1158 /*00*/ __le32 dqb_id; /* ID the structure belongs to */
1159 __le32 dqb_use_count; /* Number of nodes having reference to this structure */
1160 __le64 dqb_ihardlimit; /* absolute limit on allocated inodes */
1161 /*10*/ __le64 dqb_isoftlimit; /* preferred inode limit */
1162 __le64 dqb_curinodes; /* current # allocated inodes */
1163 /*20*/ __le64 dqb_bhardlimit; /* absolute limit on disk space */
1164 __le64 dqb_bsoftlimit; /* preferred limit on disk space */
1165 /*30*/ __le64 dqb_curspace; /* current space occupied */
1166 __le64 dqb_btime; /* time limit for excessive disk use */
1167 /*40*/ __le64 dqb_itime; /* time limit for excessive inode use */
1168 __le64 dqb_pad1;
1169 /*50*/ __le64 dqb_pad2;
1170 };
1171
1172 /*
1173 * On-disk structures for local quota file
1174 */
1175
1176 /* Magic numbers and known versions for local quota files */
1177 #define OCFS2_LOCAL_QMAGICS {\
1178 0x0cf524c0, /* USRQUOTA */ \
1179 0x0cf524c1 /* GRPQUOTA */ \
1180 }
1181
1182 #define OCFS2_LOCAL_QVERSIONS {\
1183 0, \
1184 0, \
1185 }
1186
1187 /* Quota flags in dqinfo header */
1188 #define OLQF_CLEAN 0x0001 /* Quota file is empty (this should be after\
1189 * quota has been cleanly turned off) */
1190
1191 #define OCFS2_LOCAL_INFO_OFF (sizeof(struct ocfs2_disk_dqheader))
1192
1193 /* Information header of local quota file (immediately follows the generic
1194 * header) */
1195 struct ocfs2_local_disk_dqinfo {
1196 __le32 dqi_flags; /* Flags for quota file */
1197 __le32 dqi_chunks; /* Number of chunks of quota structures
1198 * with a bitmap */
1199 __le32 dqi_blocks; /* Number of blocks allocated for quota file */
1200 };
1201
1202 /* Header of one chunk of a quota file */
1203 struct ocfs2_local_disk_chunk {
1204 __le32 dqc_free; /* Number of free entries in the bitmap */
1205 __u8 dqc_bitmap[0]; /* Bitmap of entries in the corresponding
1206 * chunk of quota file */
1207 };
1208
1209 /* One entry in local quota file */
1210 struct ocfs2_local_disk_dqblk {
1211 /*00*/ __le64 dqb_id; /* id this quota applies to */
1212 __le64 dqb_spacemod; /* Change in the amount of used space */
1213 /*10*/ __le64 dqb_inodemod; /* Change in the amount of used inodes */
1214 };
1215
1216
1217 /*
1218 * The quota trailer lives at the end of each quota block.
1219 */
1220
1221 struct ocfs2_disk_dqtrailer {
1222 /*00*/ struct ocfs2_block_check dq_check; /* Error checking */
1223 /*08*/ /* Cannot be larger than OCFS2_QBLK_RESERVED_SPACE */
1224 };
1225
1226 static inline struct ocfs2_disk_dqtrailer *ocfs2_block_dqtrailer(int blocksize,
1227 void *buf)
1228 {
1229 char *ptr = buf;
1230 ptr += blocksize - OCFS2_QBLK_RESERVED_SPACE;
1231
1232 return (struct ocfs2_disk_dqtrailer *)ptr;
1233 }
1234
1235 #ifdef __KERNEL__
1236 static inline int ocfs2_fast_symlink_chars(struct super_block *sb)
1237 {
1238 return sb->s_blocksize -
1239 offsetof(struct ocfs2_dinode, id2.i_symlink);
1240 }
1241
1242 static inline int ocfs2_max_inline_data_with_xattr(struct super_block *sb,
1243 struct ocfs2_dinode *di)
1244 {
1245 unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size);
1246
1247 if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL)
1248 return sb->s_blocksize -
1249 offsetof(struct ocfs2_dinode, id2.i_data.id_data) -
1250 xattrsize;
1251 else
1252 return sb->s_blocksize -
1253 offsetof(struct ocfs2_dinode, id2.i_data.id_data);
1254 }
1255
1256 static inline int ocfs2_extent_recs_per_inode(struct super_block *sb)
1257 {
1258 int size;
1259
1260 size = sb->s_blocksize -
1261 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
1262
1263 return size / sizeof(struct ocfs2_extent_rec);
1264 }
1265
1266 static inline int ocfs2_extent_recs_per_inode_with_xattr(
1267 struct super_block *sb,
1268 struct ocfs2_dinode *di)
1269 {
1270 int size;
1271 unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size);
1272
1273 if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL)
1274 size = sb->s_blocksize -
1275 offsetof(struct ocfs2_dinode, id2.i_list.l_recs) -
1276 xattrsize;
1277 else
1278 size = sb->s_blocksize -
1279 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
1280
1281 return size / sizeof(struct ocfs2_extent_rec);
1282 }
1283
1284 static inline int ocfs2_extent_recs_per_dx_root(struct super_block *sb)
1285 {
1286 int size;
1287
1288 size = sb->s_blocksize -
1289 offsetof(struct ocfs2_dx_root_block, dr_list.l_recs);
1290
1291 return size / sizeof(struct ocfs2_extent_rec);
1292 }
1293
1294 static inline int ocfs2_chain_recs_per_inode(struct super_block *sb)
1295 {
1296 int size;
1297
1298 size = sb->s_blocksize -
1299 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
1300
1301 return size / sizeof(struct ocfs2_chain_rec);
1302 }
1303
1304 static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb)
1305 {
1306 int size;
1307
1308 size = sb->s_blocksize -
1309 offsetof(struct ocfs2_extent_block, h_list.l_recs);
1310
1311 return size / sizeof(struct ocfs2_extent_rec);
1312 }
1313
1314 static inline int ocfs2_dx_entries_per_leaf(struct super_block *sb)
1315 {
1316 int size;
1317
1318 size = sb->s_blocksize -
1319 offsetof(struct ocfs2_dx_leaf, dl_list.de_entries);
1320
1321 return size / sizeof(struct ocfs2_dx_entry);
1322 }
1323
1324 static inline int ocfs2_dx_entries_per_root(struct super_block *sb)
1325 {
1326 int size;
1327
1328 size = sb->s_blocksize -
1329 offsetof(struct ocfs2_dx_root_block, dr_entries.de_entries);
1330
1331 return size / sizeof(struct ocfs2_dx_entry);
1332 }
1333
1334 static inline u16 ocfs2_local_alloc_size(struct super_block *sb)
1335 {
1336 u16 size;
1337
1338 size = sb->s_blocksize -
1339 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
1340
1341 return size;
1342 }
1343
1344 static inline int ocfs2_group_bitmap_size(struct super_block *sb)
1345 {
1346 int size;
1347
1348 size = sb->s_blocksize -
1349 offsetof(struct ocfs2_group_desc, bg_bitmap);
1350
1351 return size;
1352 }
1353
1354 static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb)
1355 {
1356 int size;
1357
1358 size = sb->s_blocksize -
1359 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
1360
1361 return size / sizeof(struct ocfs2_truncate_rec);
1362 }
1363
1364 static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index)
1365 {
1366 u64 offset = OCFS2_BACKUP_SB_START;
1367
1368 if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
1369 offset <<= (2 * index);
1370 offset >>= sb->s_blocksize_bits;
1371 return offset;
1372 }
1373
1374 return 0;
1375
1376 }
1377
1378 static inline u16 ocfs2_xattr_recs_per_xb(struct super_block *sb)
1379 {
1380 int size;
1381
1382 size = sb->s_blocksize -
1383 offsetof(struct ocfs2_xattr_block,
1384 xb_attrs.xb_root.xt_list.l_recs);
1385
1386 return size / sizeof(struct ocfs2_extent_rec);
1387 }
1388
1389 static inline u16 ocfs2_extent_recs_per_rb(struct super_block *sb)
1390 {
1391 int size;
1392
1393 size = sb->s_blocksize -
1394 offsetof(struct ocfs2_refcount_block, rf_list.l_recs);
1395
1396 return size / sizeof(struct ocfs2_extent_rec);
1397 }
1398
1399 static inline u16 ocfs2_refcount_recs_per_rb(struct super_block *sb)
1400 {
1401 int size;
1402
1403 size = sb->s_blocksize -
1404 offsetof(struct ocfs2_refcount_block, rf_records.rl_recs);
1405
1406 return size / sizeof(struct ocfs2_refcount_rec);
1407 }
1408
1409 static inline u32
1410 ocfs2_get_ref_rec_low_cpos(const struct ocfs2_refcount_rec *rec)
1411 {
1412 return le64_to_cpu(rec->r_cpos) & OCFS2_32BIT_POS_MASK;
1413 }
1414 #else
1415 static inline int ocfs2_fast_symlink_chars(int blocksize)
1416 {
1417 return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink);
1418 }
1419
1420 static inline int ocfs2_max_inline_data_with_xattr(int blocksize,
1421 struct ocfs2_dinode *di)
1422 {
1423 if (di && (di->i_dyn_features & OCFS2_INLINE_XATTR_FL))
1424 return blocksize -
1425 offsetof(struct ocfs2_dinode, id2.i_data.id_data) -
1426 di->i_xattr_inline_size;
1427 else
1428 return blocksize -
1429 offsetof(struct ocfs2_dinode, id2.i_data.id_data);
1430 }
1431
1432 static inline int ocfs2_extent_recs_per_inode(int blocksize)
1433 {
1434 int size;
1435
1436 size = blocksize -
1437 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
1438
1439 return size / sizeof(struct ocfs2_extent_rec);
1440 }
1441
1442 static inline int ocfs2_chain_recs_per_inode(int blocksize)
1443 {
1444 int size;
1445
1446 size = blocksize -
1447 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
1448
1449 return size / sizeof(struct ocfs2_chain_rec);
1450 }
1451
1452 static inline int ocfs2_extent_recs_per_eb(int blocksize)
1453 {
1454 int size;
1455
1456 size = blocksize -
1457 offsetof(struct ocfs2_extent_block, h_list.l_recs);
1458
1459 return size / sizeof(struct ocfs2_extent_rec);
1460 }
1461
1462 static inline int ocfs2_local_alloc_size(int blocksize)
1463 {
1464 int size;
1465
1466 size = blocksize -
1467 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
1468
1469 return size;
1470 }
1471
1472 static inline int ocfs2_group_bitmap_size(int blocksize)
1473 {
1474 int size;
1475
1476 size = blocksize -
1477 offsetof(struct ocfs2_group_desc, bg_bitmap);
1478
1479 return size;
1480 }
1481
1482 static inline int ocfs2_truncate_recs_per_inode(int blocksize)
1483 {
1484 int size;
1485
1486 size = blocksize -
1487 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
1488
1489 return size / sizeof(struct ocfs2_truncate_rec);
1490 }
1491
1492 static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index)
1493 {
1494 uint64_t offset = OCFS2_BACKUP_SB_START;
1495
1496 if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
1497 offset <<= (2 * index);
1498 offset /= blocksize;
1499 return offset;
1500 }
1501
1502 return 0;
1503 }
1504
1505 static inline int ocfs2_xattr_recs_per_xb(int blocksize)
1506 {
1507 int size;
1508
1509 size = blocksize -
1510 offsetof(struct ocfs2_xattr_block,
1511 xb_attrs.xb_root.xt_list.l_recs);
1512
1513 return size / sizeof(struct ocfs2_extent_rec);
1514 }
1515 #endif /* __KERNEL__ */
1516
1517
1518 static inline int ocfs2_system_inode_is_global(int type)
1519 {
1520 return ((type >= 0) &&
1521 (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE));
1522 }
1523
1524 static inline int ocfs2_sprintf_system_inode_name(char *buf, int len,
1525 int type, int slot)
1526 {
1527 int chars;
1528
1529 /*
1530 * Global system inodes can only have one copy. Everything
1531 * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode
1532 * list has a copy per slot.
1533 */
1534 if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)
1535 chars = snprintf(buf, len, "%s",
1536 ocfs2_system_inodes[type].si_name);
1537 else
1538 chars = snprintf(buf, len,
1539 ocfs2_system_inodes[type].si_name,
1540 slot);
1541
1542 return chars;
1543 }
1544
1545 static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de,
1546 umode_t mode)
1547 {
1548 de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
1549 }
1550
1551 #endif /* _OCFS2_FS_H */
1552
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