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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 | ||
68 | /* Compatibility flags */ | |
69 | #define OCFS2_HAS_COMPAT_FEATURE(sb,mask) \ | |
70 | ( OCFS2_SB(sb)->s_feature_compat & (mask) ) | |
71 | #define OCFS2_HAS_RO_COMPAT_FEATURE(sb,mask) \ | |
72 | ( OCFS2_SB(sb)->s_feature_ro_compat & (mask) ) | |
73 | #define OCFS2_HAS_INCOMPAT_FEATURE(sb,mask) \ | |
74 | ( OCFS2_SB(sb)->s_feature_incompat & (mask) ) | |
75 | #define OCFS2_SET_COMPAT_FEATURE(sb,mask) \ | |
76 | OCFS2_SB(sb)->s_feature_compat |= (mask) | |
77 | #define OCFS2_SET_RO_COMPAT_FEATURE(sb,mask) \ | |
78 | OCFS2_SB(sb)->s_feature_ro_compat |= (mask) | |
79 | #define OCFS2_SET_INCOMPAT_FEATURE(sb,mask) \ | |
80 | OCFS2_SB(sb)->s_feature_incompat |= (mask) | |
81 | #define OCFS2_CLEAR_COMPAT_FEATURE(sb,mask) \ | |
82 | OCFS2_SB(sb)->s_feature_compat &= ~(mask) | |
83 | #define OCFS2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ | |
84 | OCFS2_SB(sb)->s_feature_ro_compat &= ~(mask) | |
85 | #define OCFS2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ | |
86 | OCFS2_SB(sb)->s_feature_incompat &= ~(mask) | |
87 | ||
88 | #define OCFS2_FEATURE_COMPAT_SUPP 0 | |
89 | #define OCFS2_FEATURE_INCOMPAT_SUPP 0 | |
90 | #define OCFS2_FEATURE_RO_COMPAT_SUPP 0 | |
91 | ||
92 | /* | |
93 | * Heartbeat-only devices are missing journals and other files. The | |
94 | * filesystem driver can't load them, but the library can. Never put | |
95 | * this in OCFS2_FEATURE_INCOMPAT_SUPP, *ever*. | |
96 | */ | |
97 | #define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV 0x0002 | |
98 | ||
99 | ||
100 | /* | |
101 | * Flags on ocfs2_dinode.i_flags | |
102 | */ | |
103 | #define OCFS2_VALID_FL (0x00000001) /* Inode is valid */ | |
104 | #define OCFS2_UNUSED2_FL (0x00000002) | |
105 | #define OCFS2_ORPHANED_FL (0x00000004) /* On the orphan list */ | |
106 | #define OCFS2_UNUSED3_FL (0x00000008) | |
107 | /* System inode flags */ | |
108 | #define OCFS2_SYSTEM_FL (0x00000010) /* System inode */ | |
109 | #define OCFS2_SUPER_BLOCK_FL (0x00000020) /* Super block */ | |
110 | #define OCFS2_LOCAL_ALLOC_FL (0x00000040) /* Slot local alloc bitmap */ | |
111 | #define OCFS2_BITMAP_FL (0x00000080) /* Allocation bitmap */ | |
112 | #define OCFS2_JOURNAL_FL (0x00000100) /* Slot local journal */ | |
113 | #define OCFS2_HEARTBEAT_FL (0x00000200) /* Heartbeat area */ | |
114 | #define OCFS2_CHAIN_FL (0x00000400) /* Chain allocator */ | |
115 | #define OCFS2_DEALLOC_FL (0x00000800) /* Truncate log */ | |
116 | ||
117 | /* | |
118 | * Journal Flags (ocfs2_dinode.id1.journal1.i_flags) | |
119 | */ | |
120 | #define OCFS2_JOURNAL_DIRTY_FL (0x00000001) /* Journal needs recovery */ | |
121 | ||
122 | /* | |
123 | * superblock s_state flags | |
124 | */ | |
125 | #define OCFS2_ERROR_FS (0x00000001) /* FS saw errors */ | |
126 | ||
127 | /* Limit of space in ocfs2_dir_entry */ | |
128 | #define OCFS2_MAX_FILENAME_LEN 255 | |
129 | ||
130 | /* Maximum slots on an ocfs2 file system */ | |
131 | #define OCFS2_MAX_SLOTS 255 | |
132 | ||
133 | /* Slot map indicator for an empty slot */ | |
134 | #define OCFS2_INVALID_SLOT -1 | |
135 | ||
136 | #define OCFS2_VOL_UUID_LEN 16 | |
137 | #define OCFS2_MAX_VOL_LABEL_LEN 64 | |
138 | ||
139 | /* Journal limits (in bytes) */ | |
140 | #define OCFS2_MIN_JOURNAL_SIZE (4 * 1024 * 1024) | |
141 | #define OCFS2_MAX_JOURNAL_SIZE (500 * 1024 * 1024) | |
142 | ||
143 | struct ocfs2_system_inode_info { | |
144 | char *si_name; | |
145 | int si_iflags; | |
146 | int si_mode; | |
147 | }; | |
148 | ||
149 | /* System file index */ | |
150 | enum { | |
151 | BAD_BLOCK_SYSTEM_INODE = 0, | |
152 | GLOBAL_INODE_ALLOC_SYSTEM_INODE, | |
153 | SLOT_MAP_SYSTEM_INODE, | |
154 | #define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE | |
155 | HEARTBEAT_SYSTEM_INODE, | |
156 | GLOBAL_BITMAP_SYSTEM_INODE, | |
157 | #define OCFS2_LAST_GLOBAL_SYSTEM_INODE GLOBAL_BITMAP_SYSTEM_INODE | |
158 | ORPHAN_DIR_SYSTEM_INODE, | |
159 | EXTENT_ALLOC_SYSTEM_INODE, | |
160 | INODE_ALLOC_SYSTEM_INODE, | |
161 | JOURNAL_SYSTEM_INODE, | |
162 | LOCAL_ALLOC_SYSTEM_INODE, | |
163 | TRUNCATE_LOG_SYSTEM_INODE, | |
164 | NUM_SYSTEM_INODES | |
165 | }; | |
166 | ||
167 | static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = { | |
168 | /* Global system inodes (single copy) */ | |
169 | /* The first two are only used from userspace mfks/tunefs */ | |
170 | [BAD_BLOCK_SYSTEM_INODE] = { "bad_blocks", 0, S_IFREG | 0644 }, | |
171 | [GLOBAL_INODE_ALLOC_SYSTEM_INODE] = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, | |
172 | ||
173 | /* These are used by the running filesystem */ | |
174 | [SLOT_MAP_SYSTEM_INODE] = { "slot_map", 0, S_IFREG | 0644 }, | |
175 | [HEARTBEAT_SYSTEM_INODE] = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 }, | |
176 | [GLOBAL_BITMAP_SYSTEM_INODE] = { "global_bitmap", 0, S_IFREG | 0644 }, | |
177 | ||
178 | /* Slot-specific system inodes (one copy per slot) */ | |
179 | [ORPHAN_DIR_SYSTEM_INODE] = { "orphan_dir:%04d", 0, S_IFDIR | 0755 }, | |
180 | [EXTENT_ALLOC_SYSTEM_INODE] = { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, | |
181 | [INODE_ALLOC_SYSTEM_INODE] = { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, | |
182 | [JOURNAL_SYSTEM_INODE] = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 }, | |
183 | [LOCAL_ALLOC_SYSTEM_INODE] = { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 }, | |
184 | [TRUNCATE_LOG_SYSTEM_INODE] = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 } | |
185 | }; | |
186 | ||
187 | /* Parameter passed from mount.ocfs2 to module */ | |
188 | #define OCFS2_HB_NONE "heartbeat=none" | |
189 | #define OCFS2_HB_LOCAL "heartbeat=local" | |
190 | ||
191 | /* | |
192 | * OCFS2 directory file types. Only the low 3 bits are used. The | |
193 | * other bits are reserved for now. | |
194 | */ | |
195 | #define OCFS2_FT_UNKNOWN 0 | |
196 | #define OCFS2_FT_REG_FILE 1 | |
197 | #define OCFS2_FT_DIR 2 | |
198 | #define OCFS2_FT_CHRDEV 3 | |
199 | #define OCFS2_FT_BLKDEV 4 | |
200 | #define OCFS2_FT_FIFO 5 | |
201 | #define OCFS2_FT_SOCK 6 | |
202 | #define OCFS2_FT_SYMLINK 7 | |
203 | ||
204 | #define OCFS2_FT_MAX 8 | |
205 | ||
206 | /* | |
207 | * OCFS2_DIR_PAD defines the directory entries boundaries | |
208 | * | |
209 | * NOTE: It must be a multiple of 4 | |
210 | */ | |
211 | #define OCFS2_DIR_PAD 4 | |
212 | #define OCFS2_DIR_ROUND (OCFS2_DIR_PAD - 1) | |
213 | #define OCFS2_DIR_MEMBER_LEN offsetof(struct ocfs2_dir_entry, name) | |
214 | #define OCFS2_DIR_REC_LEN(name_len) (((name_len) + OCFS2_DIR_MEMBER_LEN + \ | |
215 | OCFS2_DIR_ROUND) & \ | |
216 | ~OCFS2_DIR_ROUND) | |
217 | ||
218 | #define OCFS2_LINK_MAX 32000 | |
219 | ||
220 | #define S_SHIFT 12 | |
221 | static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = { | |
222 | [S_IFREG >> S_SHIFT] = OCFS2_FT_REG_FILE, | |
223 | [S_IFDIR >> S_SHIFT] = OCFS2_FT_DIR, | |
224 | [S_IFCHR >> S_SHIFT] = OCFS2_FT_CHRDEV, | |
225 | [S_IFBLK >> S_SHIFT] = OCFS2_FT_BLKDEV, | |
226 | [S_IFIFO >> S_SHIFT] = OCFS2_FT_FIFO, | |
227 | [S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK, | |
228 | [S_IFLNK >> S_SHIFT] = OCFS2_FT_SYMLINK, | |
229 | }; | |
230 | ||
231 | ||
232 | /* | |
233 | * Convenience casts | |
234 | */ | |
235 | #define OCFS2_RAW_SB(dinode) (&((dinode)->id2.i_super)) | |
236 | ||
237 | /* | |
238 | * On disk extent record for OCFS2 | |
239 | * It describes a range of clusters on disk. | |
240 | */ | |
241 | struct ocfs2_extent_rec { | |
242 | /*00*/ __le32 e_cpos; /* Offset into the file, in clusters */ | |
243 | __le32 e_clusters; /* Clusters covered by this extent */ | |
244 | __le64 e_blkno; /* Physical disk offset, in blocks */ | |
245 | /*10*/ | |
246 | }; | |
247 | ||
248 | struct ocfs2_chain_rec { | |
249 | __le32 c_free; /* Number of free bits in this chain. */ | |
250 | __le32 c_total; /* Number of total bits in this chain */ | |
251 | __le64 c_blkno; /* Physical disk offset (blocks) of 1st group */ | |
252 | }; | |
253 | ||
254 | struct ocfs2_truncate_rec { | |
255 | __le32 t_start; /* 1st cluster in this log */ | |
256 | __le32 t_clusters; /* Number of total clusters covered */ | |
257 | }; | |
258 | ||
259 | /* | |
260 | * On disk extent list for OCFS2 (node in the tree). Note that this | |
261 | * is contained inside ocfs2_dinode or ocfs2_extent_block, so the | |
262 | * offsets are relative to ocfs2_dinode.id2.i_list or | |
263 | * ocfs2_extent_block.h_list, respectively. | |
264 | */ | |
265 | struct ocfs2_extent_list { | |
266 | /*00*/ __le16 l_tree_depth; /* Extent tree depth from this | |
267 | point. 0 means data extents | |
268 | hang directly off this | |
269 | header (a leaf) */ | |
270 | __le16 l_count; /* Number of extent records */ | |
271 | __le16 l_next_free_rec; /* Next unused extent slot */ | |
272 | __le16 l_reserved1; | |
273 | __le64 l_reserved2; /* Pad to | |
274 | sizeof(ocfs2_extent_rec) */ | |
275 | /*10*/ struct ocfs2_extent_rec l_recs[0]; /* Extent records */ | |
276 | }; | |
277 | ||
278 | /* | |
279 | * On disk allocation chain list for OCFS2. Note that this is | |
280 | * contained inside ocfs2_dinode, so the offsets are relative to | |
281 | * ocfs2_dinode.id2.i_chain. | |
282 | */ | |
283 | struct ocfs2_chain_list { | |
284 | /*00*/ __le16 cl_cpg; /* Clusters per Block Group */ | |
285 | __le16 cl_bpc; /* Bits per cluster */ | |
286 | __le16 cl_count; /* Total chains in this list */ | |
287 | __le16 cl_next_free_rec; /* Next unused chain slot */ | |
288 | __le64 cl_reserved1; | |
289 | /*10*/ struct ocfs2_chain_rec cl_recs[0]; /* Chain records */ | |
290 | }; | |
291 | ||
292 | /* | |
293 | * On disk deallocation log for OCFS2. Note that this is | |
294 | * contained inside ocfs2_dinode, so the offsets are relative to | |
295 | * ocfs2_dinode.id2.i_dealloc. | |
296 | */ | |
297 | struct ocfs2_truncate_log { | |
298 | /*00*/ __le16 tl_count; /* Total records in this log */ | |
299 | __le16 tl_used; /* Number of records in use */ | |
300 | __le32 tl_reserved1; | |
301 | /*08*/ struct ocfs2_truncate_rec tl_recs[0]; /* Truncate records */ | |
302 | }; | |
303 | ||
304 | /* | |
305 | * On disk extent block (indirect block) for OCFS2 | |
306 | */ | |
307 | struct ocfs2_extent_block | |
308 | { | |
309 | /*00*/ __u8 h_signature[8]; /* Signature for verification */ | |
310 | __le64 h_reserved1; | |
311 | /*10*/ __le16 h_suballoc_slot; /* Slot suballocator this | |
312 | extent_header belongs to */ | |
313 | __le16 h_suballoc_bit; /* Bit offset in suballocator | |
314 | block group */ | |
315 | __le32 h_fs_generation; /* Must match super block */ | |
316 | __le64 h_blkno; /* Offset on disk, in blocks */ | |
317 | /*20*/ __le64 h_reserved3; | |
318 | __le64 h_next_leaf_blk; /* Offset on disk, in blocks, | |
319 | of next leaf header pointing | |
320 | to data */ | |
321 | /*30*/ struct ocfs2_extent_list h_list; /* Extent record list */ | |
322 | /* Actual on-disk size is one block */ | |
323 | }; | |
324 | ||
325 | /* | |
326 | * On disk superblock for OCFS2 | |
327 | * Note that it is contained inside an ocfs2_dinode, so all offsets | |
328 | * are relative to the start of ocfs2_dinode.id2. | |
329 | */ | |
330 | struct ocfs2_super_block { | |
331 | /*00*/ __le16 s_major_rev_level; | |
332 | __le16 s_minor_rev_level; | |
333 | __le16 s_mnt_count; | |
334 | __le16 s_max_mnt_count; | |
335 | __le16 s_state; /* File system state */ | |
336 | __le16 s_errors; /* Behaviour when detecting errors */ | |
337 | __le32 s_checkinterval; /* Max time between checks */ | |
338 | /*10*/ __le64 s_lastcheck; /* Time of last check */ | |
339 | __le32 s_creator_os; /* OS */ | |
340 | __le32 s_feature_compat; /* Compatible feature set */ | |
341 | /*20*/ __le32 s_feature_incompat; /* Incompatible feature set */ | |
342 | __le32 s_feature_ro_compat; /* Readonly-compatible feature set */ | |
343 | __le64 s_root_blkno; /* Offset, in blocks, of root directory | |
344 | dinode */ | |
345 | /*30*/ __le64 s_system_dir_blkno; /* Offset, in blocks, of system | |
346 | directory dinode */ | |
347 | __le32 s_blocksize_bits; /* Blocksize for this fs */ | |
348 | __le32 s_clustersize_bits; /* Clustersize for this fs */ | |
349 | /*40*/ __le16 s_max_slots; /* Max number of simultaneous mounts | |
350 | before tunefs required */ | |
351 | __le16 s_reserved1; | |
352 | __le32 s_reserved2; | |
353 | __le64 s_first_cluster_group; /* Block offset of 1st cluster | |
354 | * group header */ | |
355 | /*50*/ __u8 s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */ | |
356 | /*90*/ __u8 s_uuid[OCFS2_VOL_UUID_LEN]; /* 128-bit uuid */ | |
357 | /*A0*/ | |
358 | }; | |
359 | ||
360 | /* | |
361 | * Local allocation bitmap for OCFS2 slots | |
362 | * Note that it exists inside an ocfs2_dinode, so all offsets are | |
363 | * relative to the start of ocfs2_dinode.id2. | |
364 | */ | |
365 | struct ocfs2_local_alloc | |
366 | { | |
367 | /*00*/ __le32 la_bm_off; /* Starting bit offset in main bitmap */ | |
368 | __le16 la_size; /* Size of included bitmap, in bytes */ | |
369 | __le16 la_reserved1; | |
370 | __le64 la_reserved2; | |
371 | /*10*/ __u8 la_bitmap[0]; | |
372 | }; | |
373 | ||
374 | /* | |
375 | * On disk inode for OCFS2 | |
376 | */ | |
377 | struct ocfs2_dinode { | |
378 | /*00*/ __u8 i_signature[8]; /* Signature for validation */ | |
379 | __le32 i_generation; /* Generation number */ | |
380 | __le16 i_suballoc_slot; /* Slot suballocator this inode | |
381 | belongs to */ | |
382 | __le16 i_suballoc_bit; /* Bit offset in suballocator | |
383 | block group */ | |
384 | /*10*/ __le32 i_reserved0; | |
385 | __le32 i_clusters; /* Cluster count */ | |
386 | __le32 i_uid; /* Owner UID */ | |
387 | __le32 i_gid; /* Owning GID */ | |
388 | /*20*/ __le64 i_size; /* Size in bytes */ | |
389 | __le16 i_mode; /* File mode */ | |
390 | __le16 i_links_count; /* Links count */ | |
391 | __le32 i_flags; /* File flags */ | |
392 | /*30*/ __le64 i_atime; /* Access time */ | |
393 | __le64 i_ctime; /* Creation time */ | |
394 | /*40*/ __le64 i_mtime; /* Modification time */ | |
395 | __le64 i_dtime; /* Deletion time */ | |
396 | /*50*/ __le64 i_blkno; /* Offset on disk, in blocks */ | |
397 | __le64 i_last_eb_blk; /* Pointer to last extent | |
398 | block */ | |
399 | /*60*/ __le32 i_fs_generation; /* Generation per fs-instance */ | |
400 | __le32 i_atime_nsec; | |
401 | __le32 i_ctime_nsec; | |
402 | __le32 i_mtime_nsec; | |
403 | /*70*/ __le64 i_reserved1[9]; | |
404 | /*B8*/ union { | |
405 | __le64 i_pad1; /* Generic way to refer to this | |
406 | 64bit union */ | |
407 | struct { | |
408 | __le64 i_rdev; /* Device number */ | |
409 | } dev1; | |
410 | struct { /* Info for bitmap system | |
411 | inodes */ | |
412 | __le32 i_used; /* Bits (ie, clusters) used */ | |
413 | __le32 i_total; /* Total bits (clusters) | |
414 | available */ | |
415 | } bitmap1; | |
416 | struct { /* Info for journal system | |
417 | inodes */ | |
418 | __le32 ij_flags; /* Mounted, version, etc. */ | |
419 | __le32 ij_pad; | |
420 | } journal1; | |
421 | } id1; /* Inode type dependant 1 */ | |
422 | /*C0*/ union { | |
423 | struct ocfs2_super_block i_super; | |
424 | struct ocfs2_local_alloc i_lab; | |
425 | struct ocfs2_chain_list i_chain; | |
426 | struct ocfs2_extent_list i_list; | |
427 | struct ocfs2_truncate_log i_dealloc; | |
428 | __u8 i_symlink[0]; | |
429 | } id2; | |
430 | /* Actual on-disk size is one block */ | |
431 | }; | |
432 | ||
433 | /* | |
434 | * On-disk directory entry structure for OCFS2 | |
435 | * | |
436 | * Packed as this structure could be accessed unaligned on 64-bit platforms | |
437 | */ | |
438 | struct ocfs2_dir_entry { | |
439 | /*00*/ __le64 inode; /* Inode number */ | |
440 | __le16 rec_len; /* Directory entry length */ | |
441 | __u8 name_len; /* Name length */ | |
442 | __u8 file_type; | |
443 | /*0C*/ char name[OCFS2_MAX_FILENAME_LEN]; /* File name */ | |
444 | /* Actual on-disk length specified by rec_len */ | |
445 | } __attribute__ ((packed)); | |
446 | ||
447 | /* | |
448 | * On disk allocator group structure for OCFS2 | |
449 | */ | |
450 | struct ocfs2_group_desc | |
451 | { | |
452 | /*00*/ __u8 bg_signature[8]; /* Signature for validation */ | |
453 | __le16 bg_size; /* Size of included bitmap in | |
454 | bytes. */ | |
455 | __le16 bg_bits; /* Bits represented by this | |
456 | group. */ | |
457 | __le16 bg_free_bits_count; /* Free bits count */ | |
458 | __le16 bg_chain; /* What chain I am in. */ | |
459 | /*10*/ __le32 bg_generation; | |
460 | __le32 bg_reserved1; | |
461 | __le64 bg_next_group; /* Next group in my list, in | |
462 | blocks */ | |
463 | /*20*/ __le64 bg_parent_dinode; /* dinode which owns me, in | |
464 | blocks */ | |
465 | __le64 bg_blkno; /* Offset on disk, in blocks */ | |
466 | /*30*/ __le64 bg_reserved2[2]; | |
467 | /*40*/ __u8 bg_bitmap[0]; | |
468 | }; | |
469 | ||
470 | #ifdef __KERNEL__ | |
471 | static inline int ocfs2_fast_symlink_chars(struct super_block *sb) | |
472 | { | |
473 | return sb->s_blocksize - | |
474 | offsetof(struct ocfs2_dinode, id2.i_symlink); | |
475 | } | |
476 | ||
477 | static inline int ocfs2_extent_recs_per_inode(struct super_block *sb) | |
478 | { | |
479 | int size; | |
480 | ||
481 | size = sb->s_blocksize - | |
482 | offsetof(struct ocfs2_dinode, id2.i_list.l_recs); | |
483 | ||
484 | return size / sizeof(struct ocfs2_extent_rec); | |
485 | } | |
486 | ||
487 | static inline int ocfs2_chain_recs_per_inode(struct super_block *sb) | |
488 | { | |
489 | int size; | |
490 | ||
491 | size = sb->s_blocksize - | |
492 | offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs); | |
493 | ||
494 | return size / sizeof(struct ocfs2_chain_rec); | |
495 | } | |
496 | ||
497 | static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb) | |
498 | { | |
499 | int size; | |
500 | ||
501 | size = sb->s_blocksize - | |
502 | offsetof(struct ocfs2_extent_block, h_list.l_recs); | |
503 | ||
504 | return size / sizeof(struct ocfs2_extent_rec); | |
505 | } | |
506 | ||
507 | static inline u16 ocfs2_local_alloc_size(struct super_block *sb) | |
508 | { | |
509 | u16 size; | |
510 | ||
511 | size = sb->s_blocksize - | |
512 | offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap); | |
513 | ||
514 | return size; | |
515 | } | |
516 | ||
517 | static inline int ocfs2_group_bitmap_size(struct super_block *sb) | |
518 | { | |
519 | int size; | |
520 | ||
521 | size = sb->s_blocksize - | |
522 | offsetof(struct ocfs2_group_desc, bg_bitmap); | |
523 | ||
524 | return size; | |
525 | } | |
526 | ||
527 | static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb) | |
528 | { | |
529 | int size; | |
530 | ||
531 | size = sb->s_blocksize - | |
532 | offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs); | |
533 | ||
534 | return size / sizeof(struct ocfs2_truncate_rec); | |
535 | } | |
536 | #else | |
537 | static inline int ocfs2_fast_symlink_chars(int blocksize) | |
538 | { | |
539 | return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink); | |
540 | } | |
541 | ||
542 | static inline int ocfs2_extent_recs_per_inode(int blocksize) | |
543 | { | |
544 | int size; | |
545 | ||
546 | size = blocksize - | |
547 | offsetof(struct ocfs2_dinode, id2.i_list.l_recs); | |
548 | ||
549 | return size / sizeof(struct ocfs2_extent_rec); | |
550 | } | |
551 | ||
552 | static inline int ocfs2_chain_recs_per_inode(int blocksize) | |
553 | { | |
554 | int size; | |
555 | ||
556 | size = blocksize - | |
557 | offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs); | |
558 | ||
559 | return size / sizeof(struct ocfs2_chain_rec); | |
560 | } | |
561 | ||
562 | static inline int ocfs2_extent_recs_per_eb(int blocksize) | |
563 | { | |
564 | int size; | |
565 | ||
566 | size = blocksize - | |
567 | offsetof(struct ocfs2_extent_block, h_list.l_recs); | |
568 | ||
569 | return size / sizeof(struct ocfs2_extent_rec); | |
570 | } | |
571 | ||
572 | static inline int ocfs2_local_alloc_size(int blocksize) | |
573 | { | |
574 | int size; | |
575 | ||
576 | size = blocksize - | |
577 | offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap); | |
578 | ||
579 | return size; | |
580 | } | |
581 | ||
582 | static inline int ocfs2_group_bitmap_size(int blocksize) | |
583 | { | |
584 | int size; | |
585 | ||
586 | size = blocksize - | |
587 | offsetof(struct ocfs2_group_desc, bg_bitmap); | |
588 | ||
589 | return size; | |
590 | } | |
591 | ||
592 | static inline int ocfs2_truncate_recs_per_inode(int blocksize) | |
593 | { | |
594 | int size; | |
595 | ||
596 | size = blocksize - | |
597 | offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs); | |
598 | ||
599 | return size / sizeof(struct ocfs2_truncate_rec); | |
600 | } | |
601 | #endif /* __KERNEL__ */ | |
602 | ||
603 | ||
604 | static inline int ocfs2_system_inode_is_global(int type) | |
605 | { | |
606 | return ((type >= 0) && | |
607 | (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)); | |
608 | } | |
609 | ||
610 | static inline int ocfs2_sprintf_system_inode_name(char *buf, int len, | |
611 | int type, int slot) | |
612 | { | |
613 | int chars; | |
614 | ||
615 | /* | |
616 | * Global system inodes can only have one copy. Everything | |
617 | * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode | |
618 | * list has a copy per slot. | |
619 | */ | |
620 | if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE) | |
621 | chars = snprintf(buf, len, | |
622 | ocfs2_system_inodes[type].si_name); | |
623 | else | |
624 | chars = snprintf(buf, len, | |
625 | ocfs2_system_inodes[type].si_name, | |
626 | slot); | |
627 | ||
628 | return chars; | |
629 | } | |
630 | ||
631 | static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de, | |
632 | umode_t mode) | |
633 | { | |
634 | de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; | |
635 | } | |
636 | ||
637 | #endif /* _OCFS2_FS_H */ | |
638 |