1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
2 | /* |
3 | * ocfs2_fs.h |
4 | * |
5 | * On-disk structures for OCFS2. |
6 | * |
7 | * Copyright (C) 2002, 2004 Oracle. All rights reserved. |
8 | */ |
9 | |
10 | #ifndef _OCFS2_FS_H |
11 | #define _OCFS2_FS_H |
12 | |
13 | #include <linux/magic.h> |
14 | |
15 | /* Version */ |
16 | #define OCFS2_MAJOR_REV_LEVEL 0 |
17 | #define OCFS2_MINOR_REV_LEVEL 90 |
18 | |
19 | /* |
20 | * An OCFS2 volume starts this way: |
21 | * Sector 0: Valid ocfs1_vol_disk_hdr that cleanly fails to mount OCFS. |
22 | * Sector 1: Valid ocfs1_vol_label that cleanly fails to mount OCFS. |
23 | * Block OCFS2_SUPER_BLOCK_BLKNO: OCFS2 superblock. |
24 | * |
25 | * All other structures are found from the superblock information. |
26 | * |
27 | * OCFS2_SUPER_BLOCK_BLKNO is in blocks, not sectors. eg, for a |
28 | * blocksize of 2K, it is 4096 bytes into disk. |
29 | */ |
30 | #define OCFS2_SUPER_BLOCK_BLKNO 2 |
31 | |
32 | /* |
33 | * Cluster size limits. The maximum is kept arbitrarily at 1 MB, and could |
34 | * grow if needed. |
35 | */ |
36 | #define OCFS2_MIN_CLUSTERSIZE 4096 |
37 | #define OCFS2_MAX_CLUSTERSIZE 1048576 |
38 | |
39 | /* |
40 | * Blocks cannot be bigger than clusters, so the maximum blocksize is the |
41 | * minimum cluster size. |
42 | */ |
43 | #define OCFS2_MIN_BLOCKSIZE 512 |
44 | #define OCFS2_MAX_BLOCKSIZE OCFS2_MIN_CLUSTERSIZE |
45 | |
46 | /* Object signatures */ |
47 | #define OCFS2_SUPER_BLOCK_SIGNATURE "OCFSV2" |
48 | #define OCFS2_INODE_SIGNATURE "INODE01" |
49 | #define OCFS2_EXTENT_BLOCK_SIGNATURE "EXBLK01" |
50 | #define OCFS2_GROUP_DESC_SIGNATURE "GROUP01" |
51 | #define OCFS2_XATTR_BLOCK_SIGNATURE "XATTR01" |
52 | #define OCFS2_DIR_TRAILER_SIGNATURE "DIRTRL1" |
53 | #define OCFS2_DX_ROOT_SIGNATURE "DXDIR01" |
54 | #define OCFS2_DX_LEAF_SIGNATURE "DXLEAF1" |
55 | #define OCFS2_REFCOUNT_BLOCK_SIGNATURE "REFCNT1" |
56 | |
57 | /* Compatibility flags */ |
58 | #define OCFS2_HAS_COMPAT_FEATURE(sb,mask) \ |
59 | ( OCFS2_SB(sb)->s_feature_compat & (mask) ) |
60 | #define OCFS2_HAS_RO_COMPAT_FEATURE(sb,mask) \ |
61 | ( OCFS2_SB(sb)->s_feature_ro_compat & (mask) ) |
62 | #define OCFS2_HAS_INCOMPAT_FEATURE(sb,mask) \ |
63 | ( OCFS2_SB(sb)->s_feature_incompat & (mask) ) |
64 | #define OCFS2_SET_COMPAT_FEATURE(sb,mask) \ |
65 | OCFS2_SB(sb)->s_feature_compat |= (mask) |
66 | #define OCFS2_SET_RO_COMPAT_FEATURE(sb,mask) \ |
67 | OCFS2_SB(sb)->s_feature_ro_compat |= (mask) |
68 | #define OCFS2_SET_INCOMPAT_FEATURE(sb,mask) \ |
69 | OCFS2_SB(sb)->s_feature_incompat |= (mask) |
70 | #define OCFS2_CLEAR_COMPAT_FEATURE(sb,mask) \ |
71 | OCFS2_SB(sb)->s_feature_compat &= ~(mask) |
72 | #define OCFS2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ |
73 | OCFS2_SB(sb)->s_feature_ro_compat &= ~(mask) |
74 | #define OCFS2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ |
75 | OCFS2_SB(sb)->s_feature_incompat &= ~(mask) |
76 | |
77 | #define OCFS2_FEATURE_COMPAT_SUPP (OCFS2_FEATURE_COMPAT_BACKUP_SB \ |
78 | | OCFS2_FEATURE_COMPAT_JBD2_SB) |
79 | #define OCFS2_FEATURE_INCOMPAT_SUPP (OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT \ |
80 | | OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC \ |
81 | | OCFS2_FEATURE_INCOMPAT_INLINE_DATA \ |
82 | | OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP \ |
83 | | OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK \ |
84 | | OCFS2_FEATURE_INCOMPAT_XATTR \ |
85 | | OCFS2_FEATURE_INCOMPAT_META_ECC \ |
86 | | OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS \ |
87 | | OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE \ |
88 | | OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG \ |
89 | | OCFS2_FEATURE_INCOMPAT_CLUSTERINFO \ |
90 | | OCFS2_FEATURE_INCOMPAT_APPEND_DIO) |
91 | #define OCFS2_FEATURE_RO_COMPAT_SUPP (OCFS2_FEATURE_RO_COMPAT_UNWRITTEN \ |
92 | | OCFS2_FEATURE_RO_COMPAT_USRQUOTA \ |
93 | | OCFS2_FEATURE_RO_COMPAT_GRPQUOTA) |
94 | |
95 | /* |
96 | * Heartbeat-only devices are missing journals and other files. The |
97 | * filesystem driver can't load them, but the library can. Never put |
98 | * this in OCFS2_FEATURE_INCOMPAT_SUPP, *ever*. |
99 | */ |
100 | #define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV 0x0002 |
101 | |
102 | /* |
103 | * tunefs sets this incompat flag before starting the resize and clears it |
104 | * at the end. This flag protects users from inadvertently mounting the fs |
105 | * after an aborted run without fsck-ing. |
106 | */ |
107 | #define OCFS2_FEATURE_INCOMPAT_RESIZE_INPROG 0x0004 |
108 | |
109 | /* Used to denote a non-clustered volume */ |
110 | #define OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT 0x0008 |
111 | |
112 | /* Support for sparse allocation in b-trees */ |
113 | #define OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC 0x0010 |
114 | |
115 | /* |
116 | * Tunefs sets this incompat flag before starting an operation which |
117 | * would require cleanup on abort. This is done to protect users from |
118 | * inadvertently mounting the fs after an aborted run without |
119 | * fsck-ing. |
120 | * |
121 | * s_tunefs_flags on the super block describes precisely which |
122 | * operations were in progress. |
123 | */ |
124 | #define OCFS2_FEATURE_INCOMPAT_TUNEFS_INPROG 0x0020 |
125 | |
126 | /* Support for data packed into inode blocks */ |
127 | #define OCFS2_FEATURE_INCOMPAT_INLINE_DATA 0x0040 |
128 | |
129 | /* |
130 | * Support for alternate, userspace cluster stacks. If set, the superblock |
131 | * field s_cluster_info contains a tag for the alternate stack in use as |
132 | * well as the name of the cluster being joined. |
133 | * mount.ocfs2 must pass in a matching stack name. |
134 | * |
135 | * If not set, the classic stack will be used. This is compatbile with |
136 | * all older versions. |
137 | */ |
138 | #define OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK 0x0080 |
139 | |
140 | /* Support for the extended slot map */ |
141 | #define OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP 0x100 |
142 | |
143 | /* Support for extended attributes */ |
144 | #define OCFS2_FEATURE_INCOMPAT_XATTR 0x0200 |
145 | |
146 | /* Support for indexed directores */ |
147 | #define OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS 0x0400 |
148 | |
149 | /* Metadata checksum and error correction */ |
150 | #define OCFS2_FEATURE_INCOMPAT_META_ECC 0x0800 |
151 | |
152 | /* Refcount tree support */ |
153 | #define OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE 0x1000 |
154 | |
155 | /* Discontiguous block groups */ |
156 | #define OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG 0x2000 |
157 | |
158 | /* |
159 | * Incompat bit to indicate useable clusterinfo with stackflags for all |
160 | * cluster stacks (userspace adnd o2cb). If this bit is set, |
161 | * INCOMPAT_USERSPACE_STACK becomes superfluous and thus should not be set. |
162 | */ |
163 | #define OCFS2_FEATURE_INCOMPAT_CLUSTERINFO 0x4000 |
164 | |
165 | /* |
166 | * Append Direct IO support |
167 | */ |
168 | #define OCFS2_FEATURE_INCOMPAT_APPEND_DIO 0x8000 |
169 | |
170 | /* |
171 | * backup superblock flag is used to indicate that this volume |
172 | * has backup superblocks. |
173 | */ |
174 | #define OCFS2_FEATURE_COMPAT_BACKUP_SB 0x0001 |
175 | |
176 | /* |
177 | * The filesystem will correctly handle journal feature bits. |
178 | */ |
179 | #define OCFS2_FEATURE_COMPAT_JBD2_SB 0x0002 |
180 | |
181 | /* |
182 | * Unwritten extents support. |
183 | */ |
184 | #define OCFS2_FEATURE_RO_COMPAT_UNWRITTEN 0x0001 |
185 | |
186 | /* |
187 | * Maintain quota information for this filesystem |
188 | */ |
189 | #define OCFS2_FEATURE_RO_COMPAT_USRQUOTA 0x0002 |
190 | #define OCFS2_FEATURE_RO_COMPAT_GRPQUOTA 0x0004 |
191 | |
192 | |
193 | /* The byte offset of the first backup block will be 1G. |
194 | * The following will be 4G, 16G, 64G, 256G and 1T. |
195 | */ |
196 | #define OCFS2_BACKUP_SB_START 1 << 30 |
197 | |
198 | /* the max backup superblock nums */ |
199 | #define OCFS2_MAX_BACKUP_SUPERBLOCKS 6 |
200 | |
201 | /* |
202 | * Flags on ocfs2_super_block.s_tunefs_flags |
203 | */ |
204 | #define OCFS2_TUNEFS_INPROG_REMOVE_SLOT 0x0001 /* Removing slots */ |
205 | |
206 | /* |
207 | * Flags on ocfs2_dinode.i_flags |
208 | */ |
209 | #define OCFS2_VALID_FL (0x00000001) /* Inode is valid */ |
210 | #define OCFS2_UNUSED2_FL (0x00000002) |
211 | #define OCFS2_ORPHANED_FL (0x00000004) /* On the orphan list */ |
212 | #define OCFS2_UNUSED3_FL (0x00000008) |
213 | /* System inode flags */ |
214 | #define OCFS2_SYSTEM_FL (0x00000010) /* System inode */ |
215 | #define OCFS2_SUPER_BLOCK_FL (0x00000020) /* Super block */ |
216 | #define OCFS2_LOCAL_ALLOC_FL (0x00000040) /* Slot local alloc bitmap */ |
217 | #define OCFS2_BITMAP_FL (0x00000080) /* Allocation bitmap */ |
218 | #define OCFS2_JOURNAL_FL (0x00000100) /* Slot local journal */ |
219 | #define OCFS2_HEARTBEAT_FL (0x00000200) /* Heartbeat area */ |
220 | #define OCFS2_CHAIN_FL (0x00000400) /* Chain allocator */ |
221 | #define OCFS2_DEALLOC_FL (0x00000800) /* Truncate log */ |
222 | #define OCFS2_QUOTA_FL (0x00001000) /* Quota file */ |
223 | #define OCFS2_DIO_ORPHANED_FL (0X00002000) /* On the orphan list especially |
224 | * for dio */ |
225 | |
226 | /* |
227 | * Flags on ocfs2_dinode.i_dyn_features |
228 | * |
229 | * These can change much more often than i_flags. When adding flags, |
230 | * keep in mind that i_dyn_features is only 16 bits wide. |
231 | */ |
232 | #define OCFS2_INLINE_DATA_FL (0x0001) /* Data stored in inode block */ |
233 | #define OCFS2_HAS_XATTR_FL (0x0002) |
234 | #define OCFS2_INLINE_XATTR_FL (0x0004) |
235 | #define OCFS2_INDEXED_DIR_FL (0x0008) |
236 | #define OCFS2_HAS_REFCOUNT_FL (0x0010) |
237 | |
238 | /* Inode attributes, keep in sync with EXT2 */ |
239 | #define OCFS2_SECRM_FL FS_SECRM_FL /* Secure deletion */ |
240 | #define OCFS2_UNRM_FL FS_UNRM_FL /* Undelete */ |
241 | #define OCFS2_COMPR_FL FS_COMPR_FL /* Compress file */ |
242 | #define OCFS2_SYNC_FL FS_SYNC_FL /* Synchronous updates */ |
243 | #define OCFS2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */ |
244 | #define OCFS2_APPEND_FL FS_APPEND_FL /* writes to file may only append */ |
245 | #define OCFS2_NODUMP_FL FS_NODUMP_FL /* do not dump file */ |
246 | #define OCFS2_NOATIME_FL FS_NOATIME_FL /* do not update atime */ |
247 | /* Reserved for compression usage... */ |
248 | #define OCFS2_DIRTY_FL FS_DIRTY_FL |
249 | #define OCFS2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */ |
250 | #define OCFS2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */ |
251 | #define OCFS2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */ |
252 | /* End compression flags --- maybe not all used */ |
253 | #define OCFS2_BTREE_FL FS_BTREE_FL /* btree format dir */ |
254 | #define OCFS2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */ |
255 | #define OCFS2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */ |
256 | #define OCFS2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */ |
257 | #define OCFS2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */ |
258 | #define OCFS2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */ |
259 | #define OCFS2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/ |
260 | #define OCFS2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */ |
261 | |
262 | #define OCFS2_FL_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */ |
263 | #define OCFS2_FL_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */ |
264 | |
265 | /* |
266 | * Extent record flags (e_node.leaf.flags) |
267 | */ |
268 | #define OCFS2_EXT_UNWRITTEN (0x01) /* Extent is allocated but |
269 | * unwritten */ |
270 | #define OCFS2_EXT_REFCOUNTED (0x02) /* Extent is reference |
271 | * counted in an associated |
272 | * refcount tree */ |
273 | |
274 | /* |
275 | * Journal Flags (ocfs2_dinode.id1.journal1.i_flags) |
276 | */ |
277 | #define OCFS2_JOURNAL_DIRTY_FL (0x00000001) /* Journal needs recovery */ |
278 | |
279 | /* |
280 | * superblock s_state flags |
281 | */ |
282 | #define OCFS2_ERROR_FS (0x00000001) /* FS saw errors */ |
283 | |
284 | /* Limit of space in ocfs2_dir_entry */ |
285 | #define OCFS2_MAX_FILENAME_LEN 255 |
286 | |
287 | /* Maximum slots on an ocfs2 file system */ |
288 | #define OCFS2_MAX_SLOTS 255 |
289 | |
290 | /* Slot map indicator for an empty slot */ |
291 | #define OCFS2_INVALID_SLOT ((u16)-1) |
292 | |
293 | #define OCFS2_VOL_UUID_LEN 16 |
294 | #define OCFS2_MAX_VOL_LABEL_LEN 64 |
295 | |
296 | /* The cluster stack fields */ |
297 | #define OCFS2_STACK_LABEL_LEN 4 |
298 | #define OCFS2_CLUSTER_NAME_LEN 16 |
299 | |
300 | /* Classic (historically speaking) cluster stack */ |
301 | #define OCFS2_CLASSIC_CLUSTER_STACK "o2cb" |
302 | |
303 | /* Journal limits (in bytes) */ |
304 | #define OCFS2_MIN_JOURNAL_SIZE (4 * 1024 * 1024) |
305 | |
306 | /* |
307 | * Inline extended attribute size (in bytes) |
308 | * The value chosen should be aligned to 16 byte boundaries. |
309 | */ |
310 | #define OCFS2_MIN_XATTR_INLINE_SIZE 256 |
311 | |
312 | /* |
313 | * Cluster info flags (ocfs2_cluster_info.ci_stackflags) |
314 | */ |
315 | #define OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT (0x01) |
316 | |
317 | struct ocfs2_system_inode_info { |
318 | char *si_name; |
319 | int si_iflags; |
320 | int si_mode; |
321 | }; |
322 | |
323 | /* System file index */ |
324 | enum { |
325 | BAD_BLOCK_SYSTEM_INODE = 0, |
326 | GLOBAL_INODE_ALLOC_SYSTEM_INODE, |
327 | #define OCFS2_FIRST_ONLINE_SYSTEM_INODE GLOBAL_INODE_ALLOC_SYSTEM_INODE |
328 | SLOT_MAP_SYSTEM_INODE, |
329 | HEARTBEAT_SYSTEM_INODE, |
330 | GLOBAL_BITMAP_SYSTEM_INODE, |
331 | USER_QUOTA_SYSTEM_INODE, |
332 | GROUP_QUOTA_SYSTEM_INODE, |
333 | #define OCFS2_LAST_GLOBAL_SYSTEM_INODE GROUP_QUOTA_SYSTEM_INODE |
334 | #define OCFS2_FIRST_LOCAL_SYSTEM_INODE ORPHAN_DIR_SYSTEM_INODE |
335 | ORPHAN_DIR_SYSTEM_INODE, |
336 | EXTENT_ALLOC_SYSTEM_INODE, |
337 | INODE_ALLOC_SYSTEM_INODE, |
338 | JOURNAL_SYSTEM_INODE, |
339 | LOCAL_ALLOC_SYSTEM_INODE, |
340 | TRUNCATE_LOG_SYSTEM_INODE, |
341 | LOCAL_USER_QUOTA_SYSTEM_INODE, |
342 | LOCAL_GROUP_QUOTA_SYSTEM_INODE, |
343 | #define OCFS2_LAST_LOCAL_SYSTEM_INODE LOCAL_GROUP_QUOTA_SYSTEM_INODE |
344 | NUM_SYSTEM_INODES |
345 | }; |
346 | #define NUM_GLOBAL_SYSTEM_INODES OCFS2_FIRST_LOCAL_SYSTEM_INODE |
347 | #define NUM_LOCAL_SYSTEM_INODES \ |
348 | (NUM_SYSTEM_INODES - OCFS2_FIRST_LOCAL_SYSTEM_INODE) |
349 | |
350 | static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = { |
351 | /* Global system inodes (single copy) */ |
352 | /* The first two are only used from userspace mfks/tunefs */ |
353 | [BAD_BLOCK_SYSTEM_INODE] = { "bad_blocks" , 0, S_IFREG | 0644 }, |
354 | [GLOBAL_INODE_ALLOC_SYSTEM_INODE] = { .si_name: "global_inode_alloc" , OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, |
355 | |
356 | /* These are used by the running filesystem */ |
357 | [SLOT_MAP_SYSTEM_INODE] = { .si_name: "slot_map" , .si_iflags: 0, S_IFREG | 0644 }, |
358 | [HEARTBEAT_SYSTEM_INODE] = { .si_name: "heartbeat" , OCFS2_HEARTBEAT_FL, S_IFREG | 0644 }, |
359 | [GLOBAL_BITMAP_SYSTEM_INODE] = { .si_name: "global_bitmap" , .si_iflags: 0, S_IFREG | 0644 }, |
360 | [USER_QUOTA_SYSTEM_INODE] = { .si_name: "aquota.user" , OCFS2_QUOTA_FL, S_IFREG | 0644 }, |
361 | [GROUP_QUOTA_SYSTEM_INODE] = { .si_name: "aquota.group" , OCFS2_QUOTA_FL, S_IFREG | 0644 }, |
362 | |
363 | /* Slot-specific system inodes (one copy per slot) */ |
364 | [ORPHAN_DIR_SYSTEM_INODE] = { .si_name: "orphan_dir:%04d" , .si_iflags: 0, S_IFDIR | 0755 }, |
365 | [EXTENT_ALLOC_SYSTEM_INODE] = { .si_name: "extent_alloc:%04d" , OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, |
366 | [INODE_ALLOC_SYSTEM_INODE] = { .si_name: "inode_alloc:%04d" , OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, |
367 | [JOURNAL_SYSTEM_INODE] = { .si_name: "journal:%04d" , OCFS2_JOURNAL_FL, S_IFREG | 0644 }, |
368 | [LOCAL_ALLOC_SYSTEM_INODE] = { .si_name: "local_alloc:%04d" , OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 }, |
369 | [TRUNCATE_LOG_SYSTEM_INODE] = { .si_name: "truncate_log:%04d" , OCFS2_DEALLOC_FL, S_IFREG | 0644 }, |
370 | [LOCAL_USER_QUOTA_SYSTEM_INODE] = { .si_name: "aquota.user:%04d" , OCFS2_QUOTA_FL, S_IFREG | 0644 }, |
371 | [LOCAL_GROUP_QUOTA_SYSTEM_INODE] = { .si_name: "aquota.group:%04d" , OCFS2_QUOTA_FL, S_IFREG | 0644 }, |
372 | }; |
373 | |
374 | /* Parameter passed from mount.ocfs2 to module */ |
375 | #define OCFS2_HB_NONE "heartbeat=none" |
376 | #define OCFS2_HB_LOCAL "heartbeat=local" |
377 | #define OCFS2_HB_GLOBAL "heartbeat=global" |
378 | |
379 | /* |
380 | * OCFS2_DIR_PAD defines the directory entries boundaries |
381 | * |
382 | * NOTE: It must be a multiple of 4 |
383 | */ |
384 | #define OCFS2_DIR_PAD 4 |
385 | #define OCFS2_DIR_ROUND (OCFS2_DIR_PAD - 1) |
386 | #define OCFS2_DIR_MEMBER_LEN offsetof(struct ocfs2_dir_entry, name) |
387 | #define OCFS2_DIR_REC_LEN(name_len) (((name_len) + OCFS2_DIR_MEMBER_LEN + \ |
388 | OCFS2_DIR_ROUND) & \ |
389 | ~OCFS2_DIR_ROUND) |
390 | #define OCFS2_DIR_MIN_REC_LEN OCFS2_DIR_REC_LEN(1) |
391 | |
392 | #define OCFS2_LINK_MAX 32000 |
393 | #define OCFS2_DX_LINK_MAX ((1U << 31) - 1U) |
394 | #define OCFS2_LINKS_HI_SHIFT 16 |
395 | #define OCFS2_DX_ENTRIES_MAX (0xffffffffU) |
396 | |
397 | |
398 | /* |
399 | * Convenience casts |
400 | */ |
401 | #define OCFS2_RAW_SB(dinode) (&((dinode)->id2.i_super)) |
402 | |
403 | /* |
404 | * Block checking structure. This is used in metadata to validate the |
405 | * contents. If OCFS2_FEATURE_INCOMPAT_META_ECC is not set, it is all |
406 | * zeros. |
407 | */ |
408 | struct ocfs2_block_check { |
409 | /*00*/ __le32 bc_crc32e; /* 802.3 Ethernet II CRC32 */ |
410 | __le16 bc_ecc; /* Single-error-correction parity vector. |
411 | This is a simple Hamming code dependent |
412 | on the blocksize. OCFS2's maximum |
413 | blocksize, 4K, requires 16 parity bits, |
414 | so we fit in __le16. */ |
415 | __le16 bc_reserved1; |
416 | /*08*/ |
417 | }; |
418 | |
419 | /* |
420 | * On disk extent record for OCFS2 |
421 | * It describes a range of clusters on disk. |
422 | * |
423 | * Length fields are divided into interior and leaf node versions. |
424 | * This leaves room for a flags field (OCFS2_EXT_*) in the leaf nodes. |
425 | */ |
426 | struct ocfs2_extent_rec { |
427 | /*00*/ __le32 e_cpos; /* Offset into the file, in clusters */ |
428 | union { |
429 | __le32 e_int_clusters; /* Clusters covered by all children */ |
430 | struct { |
431 | __le16 e_leaf_clusters; /* Clusters covered by this |
432 | extent */ |
433 | __u8 e_reserved1; |
434 | __u8 e_flags; /* Extent flags */ |
435 | }; |
436 | }; |
437 | __le64 e_blkno; /* Physical disk offset, in blocks */ |
438 | /*10*/ |
439 | }; |
440 | |
441 | struct ocfs2_chain_rec { |
442 | __le32 c_free; /* Number of free bits in this chain. */ |
443 | __le32 c_total; /* Number of total bits in this chain */ |
444 | __le64 c_blkno; /* Physical disk offset (blocks) of 1st group */ |
445 | }; |
446 | |
447 | struct ocfs2_truncate_rec { |
448 | __le32 t_start; /* 1st cluster in this log */ |
449 | __le32 t_clusters; /* Number of total clusters covered */ |
450 | }; |
451 | |
452 | /* |
453 | * On disk extent list for OCFS2 (node in the tree). Note that this |
454 | * is contained inside ocfs2_dinode or ocfs2_extent_block, so the |
455 | * offsets are relative to ocfs2_dinode.id2.i_list or |
456 | * ocfs2_extent_block.h_list, respectively. |
457 | */ |
458 | struct ocfs2_extent_list { |
459 | /*00*/ __le16 l_tree_depth; /* Extent tree depth from this |
460 | point. 0 means data extents |
461 | hang directly off this |
462 | header (a leaf) |
463 | NOTE: The high 8 bits cannot be |
464 | used - tree_depth is never that big. |
465 | */ |
466 | __le16 l_count; /* Number of extent records */ |
467 | __le16 l_next_free_rec; /* Next unused extent slot */ |
468 | __le16 l_reserved1; |
469 | __le64 l_reserved2; /* Pad to |
470 | sizeof(ocfs2_extent_rec) */ |
471 | /*10*/ struct ocfs2_extent_rec l_recs[]; /* Extent records */ |
472 | }; |
473 | |
474 | /* |
475 | * On disk allocation chain list for OCFS2. Note that this is |
476 | * contained inside ocfs2_dinode, so the offsets are relative to |
477 | * ocfs2_dinode.id2.i_chain. |
478 | */ |
479 | struct ocfs2_chain_list { |
480 | /*00*/ __le16 cl_cpg; /* Clusters per Block Group */ |
481 | __le16 cl_bpc; /* Bits per cluster */ |
482 | __le16 cl_count; /* Total chains in this list */ |
483 | __le16 cl_next_free_rec; /* Next unused chain slot */ |
484 | __le64 cl_reserved1; |
485 | /*10*/ struct ocfs2_chain_rec cl_recs[]; /* Chain records */ |
486 | }; |
487 | |
488 | /* |
489 | * On disk deallocation log for OCFS2. Note that this is |
490 | * contained inside ocfs2_dinode, so the offsets are relative to |
491 | * ocfs2_dinode.id2.i_dealloc. |
492 | */ |
493 | struct ocfs2_truncate_log { |
494 | /*00*/ __le16 tl_count; /* Total records in this log */ |
495 | __le16 tl_used; /* Number of records in use */ |
496 | __le32 tl_reserved1; |
497 | /*08*/ struct ocfs2_truncate_rec tl_recs[]; /* Truncate records */ |
498 | }; |
499 | |
500 | /* |
501 | * On disk extent block (indirect block) for OCFS2 |
502 | */ |
503 | struct ocfs2_extent_block |
504 | { |
505 | /*00*/ __u8 h_signature[8]; /* Signature for verification */ |
506 | struct ocfs2_block_check h_check; /* Error checking */ |
507 | /*10*/ __le16 h_suballoc_slot; /* Slot suballocator this |
508 | extent_header belongs to */ |
509 | __le16 h_suballoc_bit; /* Bit offset in suballocator |
510 | block group */ |
511 | __le32 h_fs_generation; /* Must match super block */ |
512 | __le64 h_blkno; /* Offset on disk, in blocks */ |
513 | /*20*/ __le64 h_suballoc_loc; /* Suballocator block group this |
514 | eb belongs to. Only valid |
515 | if allocated from a |
516 | discontiguous block group */ |
517 | __le64 h_next_leaf_blk; /* Offset on disk, in blocks, |
518 | of next leaf header pointing |
519 | to data */ |
520 | /*30*/ struct ocfs2_extent_list h_list; /* Extent record list */ |
521 | /* Actual on-disk size is one block */ |
522 | }; |
523 | |
524 | /* |
525 | * On disk slot map for OCFS2. This defines the contents of the "slot_map" |
526 | * system file. A slot is valid if it contains a node number >= 0. The |
527 | * value -1 (0xFFFF) is OCFS2_INVALID_SLOT. This marks a slot empty. |
528 | */ |
529 | struct ocfs2_slot_map { |
530 | /*00*/ DECLARE_FLEX_ARRAY(__le16, sm_slots); |
531 | /* |
532 | * Actual on-disk size is one block. OCFS2_MAX_SLOTS is 255, |
533 | * 255 * sizeof(__le16) == 512B, within the 512B block minimum blocksize. |
534 | */ |
535 | }; |
536 | |
537 | struct ocfs2_extended_slot { |
538 | /*00*/ __u8 es_valid; |
539 | __u8 es_reserved1[3]; |
540 | __le32 es_node_num; |
541 | /*08*/ |
542 | }; |
543 | |
544 | /* |
545 | * The extended slot map, used when OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP |
546 | * is set. It separates out the valid marker from the node number, and |
547 | * has room to grow. Unlike the old slot map, this format is defined by |
548 | * i_size. |
549 | */ |
550 | struct ocfs2_slot_map_extended { |
551 | /*00*/ DECLARE_FLEX_ARRAY(struct ocfs2_extended_slot, se_slots); |
552 | /* |
553 | * Actual size is i_size of the slot_map system file. It should |
554 | * match s_max_slots * sizeof(struct ocfs2_extended_slot) |
555 | */ |
556 | }; |
557 | |
558 | /* |
559 | * ci_stackflags is only valid if the incompat bit |
560 | * OCFS2_FEATURE_INCOMPAT_CLUSTERINFO is set. |
561 | */ |
562 | struct ocfs2_cluster_info { |
563 | /*00*/ __u8 ci_stack[OCFS2_STACK_LABEL_LEN]; |
564 | union { |
565 | __le32 ci_reserved; |
566 | struct { |
567 | __u8 ci_stackflags; |
568 | __u8 ci_reserved1; |
569 | __u8 ci_reserved2; |
570 | __u8 ci_reserved3; |
571 | }; |
572 | }; |
573 | /*08*/ __u8 ci_cluster[OCFS2_CLUSTER_NAME_LEN]; |
574 | /*18*/ |
575 | }; |
576 | |
577 | /* |
578 | * On disk superblock for OCFS2 |
579 | * Note that it is contained inside an ocfs2_dinode, so all offsets |
580 | * are relative to the start of ocfs2_dinode.id2. |
581 | */ |
582 | struct ocfs2_super_block { |
583 | /*00*/ __le16 s_major_rev_level; |
584 | __le16 s_minor_rev_level; |
585 | __le16 s_mnt_count; |
586 | __le16 s_max_mnt_count; |
587 | __le16 s_state; /* File system state */ |
588 | __le16 s_errors; /* Behaviour when detecting errors */ |
589 | __le32 s_checkinterval; /* Max time between checks */ |
590 | /*10*/ __le64 s_lastcheck; /* Time of last check */ |
591 | __le32 s_creator_os; /* OS */ |
592 | __le32 s_feature_compat; /* Compatible feature set */ |
593 | /*20*/ __le32 s_feature_incompat; /* Incompatible feature set */ |
594 | __le32 s_feature_ro_compat; /* Readonly-compatible feature set */ |
595 | __le64 s_root_blkno; /* Offset, in blocks, of root directory |
596 | dinode */ |
597 | /*30*/ __le64 s_system_dir_blkno; /* Offset, in blocks, of system |
598 | directory dinode */ |
599 | __le32 s_blocksize_bits; /* Blocksize for this fs */ |
600 | __le32 s_clustersize_bits; /* Clustersize for this fs */ |
601 | /*40*/ __le16 s_max_slots; /* Max number of simultaneous mounts |
602 | before tunefs required */ |
603 | __le16 s_tunefs_flag; |
604 | __le32 s_uuid_hash; /* hash value of uuid */ |
605 | __le64 s_first_cluster_group; /* Block offset of 1st cluster |
606 | * group header */ |
607 | /*50*/ __u8 s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */ |
608 | /*90*/ __u8 s_uuid[OCFS2_VOL_UUID_LEN]; /* 128-bit uuid */ |
609 | /*A0*/ struct ocfs2_cluster_info s_cluster_info; /* Only valid if either |
610 | userspace or clusterinfo |
611 | INCOMPAT flag set. */ |
612 | /*B8*/ __le16 s_xattr_inline_size; /* extended attribute inline size |
613 | for this fs*/ |
614 | __le16 s_reserved0; |
615 | __le32 s_dx_seed[3]; /* seed[0-2] for dx dir hash. |
616 | * s_uuid_hash serves as seed[3]. */ |
617 | /*C0*/ __le64 s_reserved2[15]; /* Fill out superblock */ |
618 | /*140*/ |
619 | |
620 | /* |
621 | * NOTE: As stated above, all offsets are relative to |
622 | * ocfs2_dinode.id2, which is at 0xC0 in the inode. |
623 | * 0xC0 + 0x140 = 0x200 or 512 bytes. A superblock must fit within |
624 | * our smallest blocksize, which is 512 bytes. To ensure this, |
625 | * we reserve the space in s_reserved2. Anything past s_reserved2 |
626 | * will not be available on the smallest blocksize. |
627 | */ |
628 | }; |
629 | |
630 | /* |
631 | * Local allocation bitmap for OCFS2 slots |
632 | * Note that it exists inside an ocfs2_dinode, so all offsets are |
633 | * relative to the start of ocfs2_dinode.id2. |
634 | */ |
635 | struct ocfs2_local_alloc |
636 | { |
637 | /*00*/ __le32 la_bm_off; /* Starting bit offset in main bitmap */ |
638 | __le16 la_size; /* Size of included bitmap, in bytes */ |
639 | __le16 la_reserved1; |
640 | __le64 la_reserved2; |
641 | /*10*/ __u8 la_bitmap[]; |
642 | }; |
643 | |
644 | /* |
645 | * Data-in-inode header. This is only used if i_dyn_features has |
646 | * OCFS2_INLINE_DATA_FL set. |
647 | */ |
648 | struct ocfs2_inline_data |
649 | { |
650 | /*00*/ __le16 id_count; /* Number of bytes that can be used |
651 | * for data, starting at id_data */ |
652 | __le16 id_reserved0; |
653 | __le32 id_reserved1; |
654 | __u8 id_data[]; /* Start of user data */ |
655 | }; |
656 | |
657 | /* |
658 | * On disk inode for OCFS2 |
659 | */ |
660 | struct ocfs2_dinode { |
661 | /*00*/ __u8 i_signature[8]; /* Signature for validation */ |
662 | __le32 i_generation; /* Generation number */ |
663 | __le16 i_suballoc_slot; /* Slot suballocator this inode |
664 | belongs to */ |
665 | __le16 i_suballoc_bit; /* Bit offset in suballocator |
666 | block group */ |
667 | /*10*/ __le16 i_links_count_hi; /* High 16 bits of links count */ |
668 | __le16 i_xattr_inline_size; |
669 | __le32 i_clusters; /* Cluster count */ |
670 | __le32 i_uid; /* Owner UID */ |
671 | __le32 i_gid; /* Owning GID */ |
672 | /*20*/ __le64 i_size; /* Size in bytes */ |
673 | __le16 i_mode; /* File mode */ |
674 | __le16 i_links_count; /* Links count */ |
675 | __le32 i_flags; /* File flags */ |
676 | /*30*/ __le64 i_atime; /* Access time */ |
677 | __le64 i_ctime; /* Creation time */ |
678 | /*40*/ __le64 i_mtime; /* Modification time */ |
679 | __le64 i_dtime; /* Deletion time */ |
680 | /*50*/ __le64 i_blkno; /* Offset on disk, in blocks */ |
681 | __le64 i_last_eb_blk; /* Pointer to last extent |
682 | block */ |
683 | /*60*/ __le32 i_fs_generation; /* Generation per fs-instance */ |
684 | __le32 i_atime_nsec; |
685 | __le32 i_ctime_nsec; |
686 | __le32 i_mtime_nsec; |
687 | /*70*/ __le32 i_attr; |
688 | __le16 i_orphaned_slot; /* Only valid when OCFS2_ORPHANED_FL |
689 | was set in i_flags */ |
690 | __le16 i_dyn_features; |
691 | __le64 i_xattr_loc; |
692 | /*80*/ struct ocfs2_block_check i_check; /* Error checking */ |
693 | /*88*/ __le64 i_dx_root; /* Pointer to dir index root block */ |
694 | /*90*/ __le64 i_refcount_loc; |
695 | __le64 i_suballoc_loc; /* Suballocator block group this |
696 | inode belongs to. Only valid |
697 | if allocated from a |
698 | discontiguous block group */ |
699 | /*A0*/ __le16 i_dio_orphaned_slot; /* only used for append dio write */ |
700 | __le16 i_reserved1[3]; |
701 | __le64 i_reserved2[2]; |
702 | /*B8*/ union { |
703 | __le64 i_pad1; /* Generic way to refer to this |
704 | 64bit union */ |
705 | struct { |
706 | __le64 i_rdev; /* Device number */ |
707 | } dev1; |
708 | struct { /* Info for bitmap system |
709 | inodes */ |
710 | __le32 i_used; /* Bits (ie, clusters) used */ |
711 | __le32 i_total; /* Total bits (clusters) |
712 | available */ |
713 | } bitmap1; |
714 | struct { /* Info for journal system |
715 | inodes */ |
716 | __le32 ij_flags; /* Mounted, version, etc. */ |
717 | __le32 ij_recovery_generation; /* Incremented when the |
718 | journal is recovered |
719 | after an unclean |
720 | shutdown */ |
721 | } journal1; |
722 | } id1; /* Inode type dependent 1 */ |
723 | /*C0*/ union { |
724 | struct ocfs2_super_block i_super; |
725 | struct ocfs2_local_alloc i_lab; |
726 | struct ocfs2_chain_list i_chain; |
727 | struct ocfs2_extent_list i_list; |
728 | struct ocfs2_truncate_log i_dealloc; |
729 | struct ocfs2_inline_data i_data; |
730 | DECLARE_FLEX_ARRAY(__u8, i_symlink); |
731 | } id2; |
732 | /* Actual on-disk size is one block */ |
733 | }; |
734 | |
735 | /* |
736 | * On-disk directory entry structure for OCFS2 |
737 | * |
738 | * Packed as this structure could be accessed unaligned on 64-bit platforms |
739 | */ |
740 | struct ocfs2_dir_entry { |
741 | /*00*/ __le64 inode; /* Inode number */ |
742 | __le16 rec_len; /* Directory entry length */ |
743 | __u8 name_len; /* Name length */ |
744 | __u8 file_type; |
745 | /*0C*/ char name[OCFS2_MAX_FILENAME_LEN]; /* File name */ |
746 | /* Actual on-disk length specified by rec_len */ |
747 | } __attribute__ ((packed)); |
748 | |
749 | /* |
750 | * Per-block record for the unindexed directory btree. This is carefully |
751 | * crafted so that the rec_len and name_len records of an ocfs2_dir_entry are |
752 | * mirrored. That way, the directory manipulation code needs a minimal amount |
753 | * of update. |
754 | * |
755 | * NOTE: Keep this structure aligned to a multiple of 4 bytes. |
756 | */ |
757 | struct ocfs2_dir_block_trailer { |
758 | /*00*/ __le64 db_compat_inode; /* Always zero. Was inode */ |
759 | |
760 | __le16 db_compat_rec_len; /* Backwards compatible with |
761 | * ocfs2_dir_entry. */ |
762 | __u8 db_compat_name_len; /* Always zero. Was name_len */ |
763 | __u8 db_reserved0; |
764 | __le16 db_reserved1; |
765 | __le16 db_free_rec_len; /* Size of largest empty hole |
766 | * in this block. (unused) */ |
767 | /*10*/ __u8 db_signature[8]; /* Signature for verification */ |
768 | __le64 db_reserved2; |
769 | /*20*/ __le64 db_free_next; /* Next block in list (unused) */ |
770 | __le64 db_blkno; /* Offset on disk, in blocks */ |
771 | /*30*/ __le64 db_parent_dinode; /* dinode which owns me, in |
772 | blocks */ |
773 | struct ocfs2_block_check db_check; /* Error checking */ |
774 | /*40*/ |
775 | }; |
776 | |
777 | /* |
778 | * A directory entry in the indexed tree. We don't store the full name here, |
779 | * but instead provide a pointer to the full dirent in the unindexed tree. |
780 | * |
781 | * We also store name_len here so as to reduce the number of leaf blocks we |
782 | * need to search in case of collisions. |
783 | */ |
784 | struct ocfs2_dx_entry { |
785 | __le32 dx_major_hash; /* Used to find logical |
786 | * cluster in index */ |
787 | __le32 dx_minor_hash; /* Lower bits used to find |
788 | * block in cluster */ |
789 | __le64 dx_dirent_blk; /* Physical block in unindexed |
790 | * tree holding this dirent. */ |
791 | }; |
792 | |
793 | struct ocfs2_dx_entry_list { |
794 | __le32 de_reserved; |
795 | __le16 de_count; /* Maximum number of entries |
796 | * possible in de_entries */ |
797 | __le16 de_num_used; /* Current number of |
798 | * de_entries entries */ |
799 | struct ocfs2_dx_entry de_entries[]; /* Indexed dir entries |
800 | * in a packed array of |
801 | * length de_num_used */ |
802 | }; |
803 | |
804 | #define OCFS2_DX_FLAG_INLINE 0x01 |
805 | |
806 | /* |
807 | * A directory indexing block. Each indexed directory has one of these, |
808 | * pointed to by ocfs2_dinode. |
809 | * |
810 | * This block stores an indexed btree root, and a set of free space |
811 | * start-of-list pointers. |
812 | */ |
813 | struct ocfs2_dx_root_block { |
814 | __u8 dr_signature[8]; /* Signature for verification */ |
815 | struct ocfs2_block_check dr_check; /* Error checking */ |
816 | __le16 dr_suballoc_slot; /* Slot suballocator this |
817 | * block belongs to. */ |
818 | __le16 dr_suballoc_bit; /* Bit offset in suballocator |
819 | * block group */ |
820 | __le32 dr_fs_generation; /* Must match super block */ |
821 | __le64 dr_blkno; /* Offset on disk, in blocks */ |
822 | __le64 dr_last_eb_blk; /* Pointer to last |
823 | * extent block */ |
824 | __le32 dr_clusters; /* Clusters allocated |
825 | * to the indexed tree. */ |
826 | __u8 dr_flags; /* OCFS2_DX_FLAG_* flags */ |
827 | __u8 dr_reserved0; |
828 | __le16 dr_reserved1; |
829 | __le64 dr_dir_blkno; /* Pointer to parent inode */ |
830 | __le32 dr_num_entries; /* Total number of |
831 | * names stored in |
832 | * this directory.*/ |
833 | __le32 dr_reserved2; |
834 | __le64 dr_free_blk; /* Pointer to head of free |
835 | * unindexed block list. */ |
836 | __le64 dr_suballoc_loc; /* Suballocator block group |
837 | this root belongs to. |
838 | Only valid if allocated |
839 | from a discontiguous |
840 | block group */ |
841 | __le64 dr_reserved3[14]; |
842 | union { |
843 | struct ocfs2_extent_list dr_list; /* Keep this aligned to 128 |
844 | * bits for maximum space |
845 | * efficiency. */ |
846 | struct ocfs2_dx_entry_list dr_entries; /* In-root-block list of |
847 | * entries. We grow out |
848 | * to extents if this |
849 | * gets too big. */ |
850 | }; |
851 | }; |
852 | |
853 | /* |
854 | * The header of a leaf block in the indexed tree. |
855 | */ |
856 | struct ocfs2_dx_leaf { |
857 | __u8 dl_signature[8];/* Signature for verification */ |
858 | struct ocfs2_block_check dl_check; /* Error checking */ |
859 | __le64 dl_blkno; /* Offset on disk, in blocks */ |
860 | __le32 dl_fs_generation;/* Must match super block */ |
861 | __le32 dl_reserved0; |
862 | __le64 dl_reserved1; |
863 | struct ocfs2_dx_entry_list dl_list; |
864 | }; |
865 | |
866 | /* |
867 | * Largest bitmap for a block (suballocator) group in bytes. This limit |
868 | * does not affect cluster groups (global allocator). Cluster group |
869 | * bitmaps run to the end of the block. |
870 | */ |
871 | #define OCFS2_MAX_BG_BITMAP_SIZE 256 |
872 | |
873 | /* |
874 | * On disk allocator group structure for OCFS2 |
875 | */ |
876 | struct ocfs2_group_desc |
877 | { |
878 | /*00*/ __u8 bg_signature[8]; /* Signature for validation */ |
879 | __le16 bg_size; /* Size of included bitmap in |
880 | bytes. */ |
881 | __le16 bg_bits; /* Bits represented by this |
882 | group. */ |
883 | __le16 bg_free_bits_count; /* Free bits count */ |
884 | __le16 bg_chain; /* What chain I am in. */ |
885 | /*10*/ __le32 bg_generation; |
886 | __le32 bg_reserved1; |
887 | __le64 bg_next_group; /* Next group in my list, in |
888 | blocks */ |
889 | /*20*/ __le64 bg_parent_dinode; /* dinode which owns me, in |
890 | blocks */ |
891 | __le64 bg_blkno; /* Offset on disk, in blocks */ |
892 | /*30*/ struct ocfs2_block_check bg_check; /* Error checking */ |
893 | __le64 bg_reserved2; |
894 | /*40*/ union { |
895 | DECLARE_FLEX_ARRAY(__u8, bg_bitmap); |
896 | struct { |
897 | /* |
898 | * Block groups may be discontiguous when |
899 | * OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG is set. |
900 | * The extents of a discontiguous block group are |
901 | * stored in bg_list. It is a flat list. |
902 | * l_tree_depth must always be zero. A |
903 | * discontiguous group is signified by a non-zero |
904 | * bg_list->l_next_free_rec. Only block groups |
905 | * can be discontiguous; Cluster groups cannot. |
906 | * We've never made a block group with more than |
907 | * 2048 blocks (256 bytes of bg_bitmap). This |
908 | * codifies that limit so that we can fit bg_list. |
909 | * bg_size of a discontiguous block group will |
910 | * be 256 to match bg_bitmap_filler. |
911 | */ |
912 | __u8 bg_bitmap_filler[OCFS2_MAX_BG_BITMAP_SIZE]; |
913 | /*140*/ struct ocfs2_extent_list bg_list; |
914 | }; |
915 | }; |
916 | /* Actual on-disk size is one block */ |
917 | }; |
918 | |
919 | struct ocfs2_refcount_rec { |
920 | /*00*/ __le64 r_cpos; /* Physical offset, in clusters */ |
921 | __le32 r_clusters; /* Clusters covered by this extent */ |
922 | __le32 r_refcount; /* Reference count of this extent */ |
923 | /*10*/ |
924 | }; |
925 | #define OCFS2_32BIT_POS_MASK (0xffffffffULL) |
926 | |
927 | #define OCFS2_REFCOUNT_LEAF_FL (0x00000001) |
928 | #define OCFS2_REFCOUNT_TREE_FL (0x00000002) |
929 | |
930 | struct ocfs2_refcount_list { |
931 | /*00*/ __le16 rl_count; /* Maximum number of entries possible |
932 | in rl_records */ |
933 | __le16 rl_used; /* Current number of used records */ |
934 | __le32 rl_reserved2; |
935 | __le64 rl_reserved1; /* Pad to sizeof(ocfs2_refcount_record) */ |
936 | /*10*/ struct ocfs2_refcount_rec rl_recs[]; /* Refcount records */ |
937 | }; |
938 | |
939 | |
940 | struct ocfs2_refcount_block { |
941 | /*00*/ __u8 rf_signature[8]; /* Signature for verification */ |
942 | __le16 rf_suballoc_slot; /* Slot suballocator this block |
943 | belongs to */ |
944 | __le16 rf_suballoc_bit; /* Bit offset in suballocator |
945 | block group */ |
946 | __le32 rf_fs_generation; /* Must match superblock */ |
947 | /*10*/ __le64 rf_blkno; /* Offset on disk, in blocks */ |
948 | __le64 rf_parent; /* Parent block, only valid if |
949 | OCFS2_REFCOUNT_LEAF_FL is set in |
950 | rf_flags */ |
951 | /*20*/ struct ocfs2_block_check rf_check; /* Error checking */ |
952 | __le64 rf_last_eb_blk; /* Pointer to last extent block */ |
953 | /*30*/ __le32 rf_count; /* Number of inodes sharing this |
954 | refcount tree */ |
955 | __le32 rf_flags; /* See the flags above */ |
956 | __le32 rf_clusters; /* clusters covered by refcount tree. */ |
957 | __le32 rf_cpos; /* cluster offset in refcount tree.*/ |
958 | /*40*/ __le32 rf_generation; /* generation number. all be the same |
959 | * for the same refcount tree. */ |
960 | __le32 rf_reserved0; |
961 | __le64 rf_suballoc_loc; /* Suballocator block group this |
962 | refcount block belongs to. Only |
963 | valid if allocated from a |
964 | discontiguous block group */ |
965 | /*50*/ __le64 rf_reserved1[6]; |
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, doesn'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 { |
1005 | __le16 ; /* contains the count of how |
1006 | many records are in the |
1007 | local xattr storage. */ |
1008 | __le16 ; /* current offset for storing |
1009 | xattr. */ |
1010 | __le16 ; /* total length of name/value |
1011 | length in this bucket. */ |
1012 | __le16 ; /* Number of xattr buckets |
1013 | in this extent record, |
1014 | only valid in the first |
1015 | bucket. */ |
1016 | struct ocfs2_block_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 []; /* 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_suballoc_loc; /* Suballocator block group this |
1078 | xattr block belongs to. Only |
1079 | valid if allocated from a |
1080 | discontiguous block group */ |
1081 | /*30*/ union { |
1082 | struct ocfs2_xattr_header ; /* xattr header if this |
1083 | block contains xattr */ |
1084 | struct ocfs2_xattr_tree_root xb_root;/* xattr tree root if this |
1085 | block cotains xattr |
1086 | tree. */ |
1087 | } xb_attrs; |
1088 | }; |
1089 | |
1090 | #define OCFS2_XATTR_ENTRY_LOCAL 0x80 |
1091 | #define OCFS2_XATTR_TYPE_MASK 0x7F |
1092 | static inline void ocfs2_xattr_set_local(struct ocfs2_xattr_entry *xe, |
1093 | int local) |
1094 | { |
1095 | if (local) |
1096 | xe->xe_type |= OCFS2_XATTR_ENTRY_LOCAL; |
1097 | else |
1098 | xe->xe_type &= ~OCFS2_XATTR_ENTRY_LOCAL; |
1099 | } |
1100 | |
1101 | static inline int ocfs2_xattr_is_local(struct ocfs2_xattr_entry *xe) |
1102 | { |
1103 | return xe->xe_type & OCFS2_XATTR_ENTRY_LOCAL; |
1104 | } |
1105 | |
1106 | static inline void ocfs2_xattr_set_type(struct ocfs2_xattr_entry *xe, int type) |
1107 | { |
1108 | xe->xe_type |= type & OCFS2_XATTR_TYPE_MASK; |
1109 | } |
1110 | |
1111 | static inline int ocfs2_xattr_get_type(struct ocfs2_xattr_entry *xe) |
1112 | { |
1113 | return xe->xe_type & OCFS2_XATTR_TYPE_MASK; |
1114 | } |
1115 | |
1116 | /* |
1117 | * On disk structures for global quota file |
1118 | */ |
1119 | |
1120 | /* Magic numbers and known versions for global quota files */ |
1121 | #define OCFS2_GLOBAL_QMAGICS {\ |
1122 | 0x0cf52470, /* USRQUOTA */ \ |
1123 | 0x0cf52471 /* GRPQUOTA */ \ |
1124 | } |
1125 | |
1126 | #define OCFS2_GLOBAL_QVERSIONS {\ |
1127 | 0, \ |
1128 | 0, \ |
1129 | } |
1130 | |
1131 | |
1132 | /* Each block of each quota file has a certain fixed number of bytes reserved |
1133 | * for OCFS2 internal use at its end. OCFS2 can use it for things like |
1134 | * checksums, etc. */ |
1135 | #define OCFS2_QBLK_RESERVED_SPACE 8 |
1136 | |
1137 | /* Generic header of all quota files */ |
1138 | struct { |
1139 | __le32 ; /* Magic number identifying file */ |
1140 | __le32 ; /* Quota format version */ |
1141 | }; |
1142 | |
1143 | #define OCFS2_GLOBAL_INFO_OFF (sizeof(struct ocfs2_disk_dqheader)) |
1144 | |
1145 | /* Information header of global quota file (immediately follows the generic |
1146 | * header) */ |
1147 | struct ocfs2_global_disk_dqinfo { |
1148 | /*00*/ __le32 dqi_bgrace; /* Grace time for space softlimit excess */ |
1149 | __le32 dqi_igrace; /* Grace time for inode softlimit excess */ |
1150 | __le32 dqi_syncms; /* Time after which we sync local changes to |
1151 | * global quota file */ |
1152 | __le32 dqi_blocks; /* Number of blocks in quota file */ |
1153 | /*10*/ __le32 dqi_free_blk; /* First free block in quota file */ |
1154 | __le32 dqi_free_entry; /* First block with free dquot entry in quota |
1155 | * file */ |
1156 | }; |
1157 | |
1158 | /* Structure with global user / group information. We reserve some space |
1159 | * for future use. */ |
1160 | struct ocfs2_global_disk_dqblk { |
1161 | /*00*/ __le32 dqb_id; /* ID the structure belongs to */ |
1162 | __le32 dqb_use_count; /* Number of nodes having reference to this structure */ |
1163 | __le64 dqb_ihardlimit; /* absolute limit on allocated inodes */ |
1164 | /*10*/ __le64 dqb_isoftlimit; /* preferred inode limit */ |
1165 | __le64 dqb_curinodes; /* current # allocated inodes */ |
1166 | /*20*/ __le64 dqb_bhardlimit; /* absolute limit on disk space */ |
1167 | __le64 dqb_bsoftlimit; /* preferred limit on disk space */ |
1168 | /*30*/ __le64 dqb_curspace; /* current space occupied */ |
1169 | __le64 dqb_btime; /* time limit for excessive disk use */ |
1170 | /*40*/ __le64 dqb_itime; /* time limit for excessive inode use */ |
1171 | __le64 dqb_pad1; |
1172 | /*50*/ __le64 dqb_pad2; |
1173 | }; |
1174 | |
1175 | /* |
1176 | * On-disk structures for local quota file |
1177 | */ |
1178 | |
1179 | /* Magic numbers and known versions for local quota files */ |
1180 | #define OCFS2_LOCAL_QMAGICS {\ |
1181 | 0x0cf524c0, /* USRQUOTA */ \ |
1182 | 0x0cf524c1 /* GRPQUOTA */ \ |
1183 | } |
1184 | |
1185 | #define OCFS2_LOCAL_QVERSIONS {\ |
1186 | 0, \ |
1187 | 0, \ |
1188 | } |
1189 | |
1190 | /* Quota flags in dqinfo header */ |
1191 | #define OLQF_CLEAN 0x0001 /* Quota file is empty (this should be after\ |
1192 | * quota has been cleanly turned off) */ |
1193 | |
1194 | #define OCFS2_LOCAL_INFO_OFF (sizeof(struct ocfs2_disk_dqheader)) |
1195 | |
1196 | /* Information header of local quota file (immediately follows the generic |
1197 | * header) */ |
1198 | struct ocfs2_local_disk_dqinfo { |
1199 | __le32 dqi_flags; /* Flags for quota file */ |
1200 | __le32 dqi_chunks; /* Number of chunks of quota structures |
1201 | * with a bitmap */ |
1202 | __le32 dqi_blocks; /* Number of blocks allocated for quota file */ |
1203 | }; |
1204 | |
1205 | /* Header of one chunk of a quota file */ |
1206 | struct ocfs2_local_disk_chunk { |
1207 | __le32 dqc_free; /* Number of free entries in the bitmap */ |
1208 | __u8 dqc_bitmap[]; /* Bitmap of entries in the corresponding |
1209 | * chunk of quota file */ |
1210 | }; |
1211 | |
1212 | /* One entry in local quota file */ |
1213 | struct ocfs2_local_disk_dqblk { |
1214 | /*00*/ __le64 dqb_id; /* id this quota applies to */ |
1215 | __le64 dqb_spacemod; /* Change in the amount of used space */ |
1216 | /*10*/ __le64 dqb_inodemod; /* Change in the amount of used inodes */ |
1217 | }; |
1218 | |
1219 | |
1220 | /* |
1221 | * The quota trailer lives at the end of each quota block. |
1222 | */ |
1223 | |
1224 | struct ocfs2_disk_dqtrailer { |
1225 | /*00*/ struct ocfs2_block_check dq_check; /* Error checking */ |
1226 | /*08*/ /* Cannot be larger than OCFS2_QBLK_RESERVED_SPACE */ |
1227 | }; |
1228 | |
1229 | static inline struct ocfs2_disk_dqtrailer *ocfs2_block_dqtrailer(int blocksize, |
1230 | void *buf) |
1231 | { |
1232 | char *ptr = buf; |
1233 | ptr += blocksize - OCFS2_QBLK_RESERVED_SPACE; |
1234 | |
1235 | return (struct ocfs2_disk_dqtrailer *)ptr; |
1236 | } |
1237 | |
1238 | #ifdef __KERNEL__ |
1239 | static inline int ocfs2_fast_symlink_chars(struct super_block *sb) |
1240 | { |
1241 | return sb->s_blocksize - |
1242 | offsetof(struct ocfs2_dinode, id2.i_symlink); |
1243 | } |
1244 | |
1245 | static inline int ocfs2_max_inline_data_with_xattr(struct super_block *sb, |
1246 | struct ocfs2_dinode *di) |
1247 | { |
1248 | unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size); |
1249 | |
1250 | if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL) |
1251 | return sb->s_blocksize - |
1252 | offsetof(struct ocfs2_dinode, id2.i_data.id_data) - |
1253 | xattrsize; |
1254 | else |
1255 | return sb->s_blocksize - |
1256 | offsetof(struct ocfs2_dinode, id2.i_data.id_data); |
1257 | } |
1258 | |
1259 | static inline int ocfs2_extent_recs_per_inode(struct super_block *sb) |
1260 | { |
1261 | int size; |
1262 | |
1263 | size = sb->s_blocksize - |
1264 | offsetof(struct ocfs2_dinode, id2.i_list.l_recs); |
1265 | |
1266 | return size / sizeof(struct ocfs2_extent_rec); |
1267 | } |
1268 | |
1269 | static inline int ocfs2_extent_recs_per_inode_with_xattr( |
1270 | struct super_block *sb, |
1271 | struct ocfs2_dinode *di) |
1272 | { |
1273 | int size; |
1274 | unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size); |
1275 | |
1276 | if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL) |
1277 | size = sb->s_blocksize - |
1278 | offsetof(struct ocfs2_dinode, id2.i_list.l_recs) - |
1279 | xattrsize; |
1280 | else |
1281 | size = sb->s_blocksize - |
1282 | offsetof(struct ocfs2_dinode, id2.i_list.l_recs); |
1283 | |
1284 | return size / sizeof(struct ocfs2_extent_rec); |
1285 | } |
1286 | |
1287 | static inline int ocfs2_extent_recs_per_dx_root(struct super_block *sb) |
1288 | { |
1289 | int size; |
1290 | |
1291 | size = sb->s_blocksize - |
1292 | offsetof(struct ocfs2_dx_root_block, dr_list.l_recs); |
1293 | |
1294 | return size / sizeof(struct ocfs2_extent_rec); |
1295 | } |
1296 | |
1297 | static inline int ocfs2_chain_recs_per_inode(struct super_block *sb) |
1298 | { |
1299 | int size; |
1300 | |
1301 | size = sb->s_blocksize - |
1302 | offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs); |
1303 | |
1304 | return size / sizeof(struct ocfs2_chain_rec); |
1305 | } |
1306 | |
1307 | static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb) |
1308 | { |
1309 | int size; |
1310 | |
1311 | size = sb->s_blocksize - |
1312 | offsetof(struct ocfs2_extent_block, h_list.l_recs); |
1313 | |
1314 | return size / sizeof(struct ocfs2_extent_rec); |
1315 | } |
1316 | |
1317 | static inline u16 ocfs2_extent_recs_per_gd(struct super_block *sb) |
1318 | { |
1319 | int size; |
1320 | |
1321 | size = sb->s_blocksize - |
1322 | offsetof(struct ocfs2_group_desc, bg_list.l_recs); |
1323 | |
1324 | return size / sizeof(struct ocfs2_extent_rec); |
1325 | } |
1326 | |
1327 | static inline int ocfs2_dx_entries_per_leaf(struct super_block *sb) |
1328 | { |
1329 | int size; |
1330 | |
1331 | size = sb->s_blocksize - |
1332 | offsetof(struct ocfs2_dx_leaf, dl_list.de_entries); |
1333 | |
1334 | return size / sizeof(struct ocfs2_dx_entry); |
1335 | } |
1336 | |
1337 | static inline int ocfs2_dx_entries_per_root(struct super_block *sb) |
1338 | { |
1339 | int size; |
1340 | |
1341 | size = sb->s_blocksize - |
1342 | offsetof(struct ocfs2_dx_root_block, dr_entries.de_entries); |
1343 | |
1344 | return size / sizeof(struct ocfs2_dx_entry); |
1345 | } |
1346 | |
1347 | static inline u16 ocfs2_local_alloc_size(struct super_block *sb) |
1348 | { |
1349 | u16 size; |
1350 | |
1351 | size = sb->s_blocksize - |
1352 | offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap); |
1353 | |
1354 | return size; |
1355 | } |
1356 | |
1357 | static inline int ocfs2_group_bitmap_size(struct super_block *sb, |
1358 | int suballocator, |
1359 | u32 feature_incompat) |
1360 | { |
1361 | int size = sb->s_blocksize - |
1362 | offsetof(struct ocfs2_group_desc, bg_bitmap); |
1363 | |
1364 | /* |
1365 | * The cluster allocator uses the entire block. Suballocators have |
1366 | * never used more than OCFS2_MAX_BG_BITMAP_SIZE. Unfortunately, older |
1367 | * code expects bg_size set to the maximum. Thus we must keep |
1368 | * bg_size as-is unless discontig_bg is enabled. |
1369 | */ |
1370 | if (suballocator && |
1371 | (feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG)) |
1372 | size = OCFS2_MAX_BG_BITMAP_SIZE; |
1373 | |
1374 | return size; |
1375 | } |
1376 | |
1377 | static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb) |
1378 | { |
1379 | int size; |
1380 | |
1381 | size = sb->s_blocksize - |
1382 | offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs); |
1383 | |
1384 | return size / sizeof(struct ocfs2_truncate_rec); |
1385 | } |
1386 | |
1387 | static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index) |
1388 | { |
1389 | u64 offset = OCFS2_BACKUP_SB_START; |
1390 | |
1391 | if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) { |
1392 | offset <<= (2 * index); |
1393 | offset >>= sb->s_blocksize_bits; |
1394 | return offset; |
1395 | } |
1396 | |
1397 | return 0; |
1398 | |
1399 | } |
1400 | |
1401 | static inline u16 ocfs2_xattr_recs_per_xb(struct super_block *sb) |
1402 | { |
1403 | int size; |
1404 | |
1405 | size = sb->s_blocksize - |
1406 | offsetof(struct ocfs2_xattr_block, |
1407 | xb_attrs.xb_root.xt_list.l_recs); |
1408 | |
1409 | return size / sizeof(struct ocfs2_extent_rec); |
1410 | } |
1411 | |
1412 | static inline u16 ocfs2_extent_recs_per_rb(struct super_block *sb) |
1413 | { |
1414 | int size; |
1415 | |
1416 | size = sb->s_blocksize - |
1417 | offsetof(struct ocfs2_refcount_block, rf_list.l_recs); |
1418 | |
1419 | return size / sizeof(struct ocfs2_extent_rec); |
1420 | } |
1421 | |
1422 | static inline u16 ocfs2_refcount_recs_per_rb(struct super_block *sb) |
1423 | { |
1424 | int size; |
1425 | |
1426 | size = sb->s_blocksize - |
1427 | offsetof(struct ocfs2_refcount_block, rf_records.rl_recs); |
1428 | |
1429 | return size / sizeof(struct ocfs2_refcount_rec); |
1430 | } |
1431 | |
1432 | static inline u32 |
1433 | ocfs2_get_ref_rec_low_cpos(const struct ocfs2_refcount_rec *rec) |
1434 | { |
1435 | return le64_to_cpu(rec->r_cpos) & OCFS2_32BIT_POS_MASK; |
1436 | } |
1437 | #else |
1438 | static inline int ocfs2_fast_symlink_chars(int blocksize) |
1439 | { |
1440 | return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink); |
1441 | } |
1442 | |
1443 | static inline int ocfs2_max_inline_data_with_xattr(int blocksize, |
1444 | struct ocfs2_dinode *di) |
1445 | { |
1446 | if (di && (di->i_dyn_features & OCFS2_INLINE_XATTR_FL)) |
1447 | return blocksize - |
1448 | offsetof(struct ocfs2_dinode, id2.i_data.id_data) - |
1449 | di->i_xattr_inline_size; |
1450 | else |
1451 | return blocksize - |
1452 | offsetof(struct ocfs2_dinode, id2.i_data.id_data); |
1453 | } |
1454 | |
1455 | static inline int ocfs2_extent_recs_per_inode(int blocksize) |
1456 | { |
1457 | int size; |
1458 | |
1459 | size = blocksize - |
1460 | offsetof(struct ocfs2_dinode, id2.i_list.l_recs); |
1461 | |
1462 | return size / sizeof(struct ocfs2_extent_rec); |
1463 | } |
1464 | |
1465 | static inline int ocfs2_chain_recs_per_inode(int blocksize) |
1466 | { |
1467 | int size; |
1468 | |
1469 | size = blocksize - |
1470 | offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs); |
1471 | |
1472 | return size / sizeof(struct ocfs2_chain_rec); |
1473 | } |
1474 | |
1475 | static inline int ocfs2_extent_recs_per_eb(int blocksize) |
1476 | { |
1477 | int size; |
1478 | |
1479 | size = blocksize - |
1480 | offsetof(struct ocfs2_extent_block, h_list.l_recs); |
1481 | |
1482 | return size / sizeof(struct ocfs2_extent_rec); |
1483 | } |
1484 | |
1485 | static inline int ocfs2_extent_recs_per_gd(int blocksize) |
1486 | { |
1487 | int size; |
1488 | |
1489 | size = blocksize - |
1490 | offsetof(struct ocfs2_group_desc, bg_list.l_recs); |
1491 | |
1492 | return size / sizeof(struct ocfs2_extent_rec); |
1493 | } |
1494 | |
1495 | static inline int ocfs2_local_alloc_size(int blocksize) |
1496 | { |
1497 | int size; |
1498 | |
1499 | size = blocksize - |
1500 | offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap); |
1501 | |
1502 | return size; |
1503 | } |
1504 | |
1505 | static inline int ocfs2_group_bitmap_size(int blocksize, |
1506 | int suballocator, |
1507 | uint32_t feature_incompat) |
1508 | { |
1509 | int size = sb->s_blocksize - |
1510 | offsetof(struct ocfs2_group_desc, bg_bitmap); |
1511 | |
1512 | /* |
1513 | * The cluster allocator uses the entire block. Suballocators have |
1514 | * never used more than OCFS2_MAX_BG_BITMAP_SIZE. Unfortunately, older |
1515 | * code expects bg_size set to the maximum. Thus we must keep |
1516 | * bg_size as-is unless discontig_bg is enabled. |
1517 | */ |
1518 | if (suballocator && |
1519 | (feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG)) |
1520 | size = OCFS2_MAX_BG_BITMAP_SIZE; |
1521 | |
1522 | return size; |
1523 | } |
1524 | |
1525 | static inline int ocfs2_truncate_recs_per_inode(int blocksize) |
1526 | { |
1527 | int size; |
1528 | |
1529 | size = blocksize - |
1530 | offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs); |
1531 | |
1532 | return size / sizeof(struct ocfs2_truncate_rec); |
1533 | } |
1534 | |
1535 | static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index) |
1536 | { |
1537 | uint64_t offset = OCFS2_BACKUP_SB_START; |
1538 | |
1539 | if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) { |
1540 | offset <<= (2 * index); |
1541 | offset /= blocksize; |
1542 | return offset; |
1543 | } |
1544 | |
1545 | return 0; |
1546 | } |
1547 | |
1548 | static inline int ocfs2_xattr_recs_per_xb(int blocksize) |
1549 | { |
1550 | int size; |
1551 | |
1552 | size = blocksize - |
1553 | offsetof(struct ocfs2_xattr_block, |
1554 | xb_attrs.xb_root.xt_list.l_recs); |
1555 | |
1556 | return size / sizeof(struct ocfs2_extent_rec); |
1557 | } |
1558 | #endif /* __KERNEL__ */ |
1559 | |
1560 | |
1561 | static inline int ocfs2_system_inode_is_global(int type) |
1562 | { |
1563 | return ((type >= 0) && |
1564 | (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)); |
1565 | } |
1566 | |
1567 | static inline int ocfs2_sprintf_system_inode_name(char *buf, int len, |
1568 | int type, int slot) |
1569 | { |
1570 | int chars; |
1571 | |
1572 | /* |
1573 | * Global system inodes can only have one copy. Everything |
1574 | * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode |
1575 | * list has a copy per slot. |
1576 | */ |
1577 | if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE) |
1578 | chars = snprintf(buf, size: len, fmt: "%s" , |
1579 | ocfs2_system_inodes[type].si_name); |
1580 | else |
1581 | chars = snprintf(buf, size: len, |
1582 | fmt: ocfs2_system_inodes[type].si_name, |
1583 | slot); |
1584 | |
1585 | return chars; |
1586 | } |
1587 | |
1588 | static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de, |
1589 | umode_t mode) |
1590 | { |
1591 | de->file_type = fs_umode_to_ftype(mode); |
1592 | } |
1593 | |
1594 | static inline int ocfs2_gd_is_discontig(struct ocfs2_group_desc *gd) |
1595 | { |
1596 | if ((offsetof(struct ocfs2_group_desc, bg_bitmap) + |
1597 | le16_to_cpu(gd->bg_size)) != |
1598 | offsetof(struct ocfs2_group_desc, bg_list)) |
1599 | return 0; |
1600 | /* |
1601 | * Only valid to check l_next_free_rec if |
1602 | * bg_bitmap + bg_size == bg_list. |
1603 | */ |
1604 | if (!gd->bg_list.l_next_free_rec) |
1605 | return 0; |
1606 | return 1; |
1607 | } |
1608 | #endif /* _OCFS2_FS_H */ |
1609 | |
1610 | |