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ccd979bd MF |
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 | ||
50af94b1 | 88 | #define OCFS2_FEATURE_COMPAT_SUPP OCFS2_FEATURE_COMPAT_BACKUP_SB |
dcd0538f MF |
89 | #define OCFS2_FEATURE_INCOMPAT_SUPP (OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT \ |
90 | | OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC) | |
ccd979bd MF |
91 | #define OCFS2_FEATURE_RO_COMPAT_SUPP 0 |
92 | ||
93 | /* | |
94 | * Heartbeat-only devices are missing journals and other files. The | |
95 | * filesystem driver can't load them, but the library can. Never put | |
96 | * this in OCFS2_FEATURE_INCOMPAT_SUPP, *ever*. | |
97 | */ | |
98 | #define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV 0x0002 | |
99 | ||
8903901d MF |
100 | /* |
101 | * tunefs sets this incompat flag before starting the resize and clears it | |
102 | * at the end. This flag protects users from inadvertently mounting the fs | |
103 | * after an aborted run without fsck-ing. | |
104 | */ | |
105 | #define OCFS2_FEATURE_INCOMPAT_RESIZE_INPROG 0x0004 | |
ccd979bd | 106 | |
c271c5c2 SM |
107 | /* Used to denote a non-clustered volume */ |
108 | #define OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT 0x0008 | |
109 | ||
8903901d MF |
110 | /* Support for sparse allocation in b-trees */ |
111 | #define OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC 0x0010 | |
112 | ||
50af94b1 MF |
113 | /* |
114 | * backup superblock flag is used to indicate that this volume | |
115 | * has backup superblocks. | |
116 | */ | |
117 | #define OCFS2_FEATURE_COMPAT_BACKUP_SB 0x0001 | |
118 | ||
119 | /* The byte offset of the first backup block will be 1G. | |
120 | * The following will be 4G, 16G, 64G, 256G and 1T. | |
121 | */ | |
122 | #define OCFS2_BACKUP_SB_START 1 << 30 | |
123 | ||
124 | /* the max backup superblock nums */ | |
125 | #define OCFS2_MAX_BACKUP_SUPERBLOCKS 6 | |
126 | ||
ccd979bd MF |
127 | /* |
128 | * Flags on ocfs2_dinode.i_flags | |
129 | */ | |
130 | #define OCFS2_VALID_FL (0x00000001) /* Inode is valid */ | |
131 | #define OCFS2_UNUSED2_FL (0x00000002) | |
132 | #define OCFS2_ORPHANED_FL (0x00000004) /* On the orphan list */ | |
133 | #define OCFS2_UNUSED3_FL (0x00000008) | |
134 | /* System inode flags */ | |
135 | #define OCFS2_SYSTEM_FL (0x00000010) /* System inode */ | |
136 | #define OCFS2_SUPER_BLOCK_FL (0x00000020) /* Super block */ | |
137 | #define OCFS2_LOCAL_ALLOC_FL (0x00000040) /* Slot local alloc bitmap */ | |
138 | #define OCFS2_BITMAP_FL (0x00000080) /* Allocation bitmap */ | |
139 | #define OCFS2_JOURNAL_FL (0x00000100) /* Slot local journal */ | |
140 | #define OCFS2_HEARTBEAT_FL (0x00000200) /* Heartbeat area */ | |
141 | #define OCFS2_CHAIN_FL (0x00000400) /* Chain allocator */ | |
142 | #define OCFS2_DEALLOC_FL (0x00000800) /* Truncate log */ | |
143 | ||
ca4d147e HP |
144 | /* Inode attributes, keep in sync with EXT2 */ |
145 | #define OCFS2_SECRM_FL (0x00000001) /* Secure deletion */ | |
146 | #define OCFS2_UNRM_FL (0x00000002) /* Undelete */ | |
147 | #define OCFS2_COMPR_FL (0x00000004) /* Compress file */ | |
148 | #define OCFS2_SYNC_FL (0x00000008) /* Synchronous updates */ | |
149 | #define OCFS2_IMMUTABLE_FL (0x00000010) /* Immutable file */ | |
150 | #define OCFS2_APPEND_FL (0x00000020) /* writes to file may only append */ | |
151 | #define OCFS2_NODUMP_FL (0x00000040) /* do not dump file */ | |
152 | #define OCFS2_NOATIME_FL (0x00000080) /* do not update atime */ | |
153 | #define OCFS2_DIRSYNC_FL (0x00010000) /* dirsync behaviour (directories only) */ | |
154 | ||
155 | #define OCFS2_FL_VISIBLE (0x000100FF) /* User visible flags */ | |
156 | #define OCFS2_FL_MODIFIABLE (0x000100FF) /* User modifiable flags */ | |
157 | ||
158 | /* | |
159 | * ioctl commands | |
160 | */ | |
161 | #define OCFS2_IOC_GETFLAGS _IOR('f', 1, long) | |
162 | #define OCFS2_IOC_SETFLAGS _IOW('f', 2, long) | |
163 | ||
ccd979bd MF |
164 | /* |
165 | * Journal Flags (ocfs2_dinode.id1.journal1.i_flags) | |
166 | */ | |
167 | #define OCFS2_JOURNAL_DIRTY_FL (0x00000001) /* Journal needs recovery */ | |
168 | ||
169 | /* | |
170 | * superblock s_state flags | |
171 | */ | |
172 | #define OCFS2_ERROR_FS (0x00000001) /* FS saw errors */ | |
173 | ||
174 | /* Limit of space in ocfs2_dir_entry */ | |
175 | #define OCFS2_MAX_FILENAME_LEN 255 | |
176 | ||
177 | /* Maximum slots on an ocfs2 file system */ | |
178 | #define OCFS2_MAX_SLOTS 255 | |
179 | ||
180 | /* Slot map indicator for an empty slot */ | |
181 | #define OCFS2_INVALID_SLOT -1 | |
182 | ||
183 | #define OCFS2_VOL_UUID_LEN 16 | |
184 | #define OCFS2_MAX_VOL_LABEL_LEN 64 | |
185 | ||
186 | /* Journal limits (in bytes) */ | |
187 | #define OCFS2_MIN_JOURNAL_SIZE (4 * 1024 * 1024) | |
ccd979bd MF |
188 | |
189 | struct ocfs2_system_inode_info { | |
190 | char *si_name; | |
191 | int si_iflags; | |
192 | int si_mode; | |
193 | }; | |
194 | ||
195 | /* System file index */ | |
196 | enum { | |
197 | BAD_BLOCK_SYSTEM_INODE = 0, | |
198 | GLOBAL_INODE_ALLOC_SYSTEM_INODE, | |
199 | SLOT_MAP_SYSTEM_INODE, | |
200 | #define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE | |
201 | HEARTBEAT_SYSTEM_INODE, | |
202 | GLOBAL_BITMAP_SYSTEM_INODE, | |
203 | #define OCFS2_LAST_GLOBAL_SYSTEM_INODE GLOBAL_BITMAP_SYSTEM_INODE | |
204 | ORPHAN_DIR_SYSTEM_INODE, | |
205 | EXTENT_ALLOC_SYSTEM_INODE, | |
206 | INODE_ALLOC_SYSTEM_INODE, | |
207 | JOURNAL_SYSTEM_INODE, | |
208 | LOCAL_ALLOC_SYSTEM_INODE, | |
209 | TRUNCATE_LOG_SYSTEM_INODE, | |
210 | NUM_SYSTEM_INODES | |
211 | }; | |
212 | ||
213 | static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = { | |
214 | /* Global system inodes (single copy) */ | |
215 | /* The first two are only used from userspace mfks/tunefs */ | |
216 | [BAD_BLOCK_SYSTEM_INODE] = { "bad_blocks", 0, S_IFREG | 0644 }, | |
217 | [GLOBAL_INODE_ALLOC_SYSTEM_INODE] = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, | |
218 | ||
219 | /* These are used by the running filesystem */ | |
220 | [SLOT_MAP_SYSTEM_INODE] = { "slot_map", 0, S_IFREG | 0644 }, | |
221 | [HEARTBEAT_SYSTEM_INODE] = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 }, | |
222 | [GLOBAL_BITMAP_SYSTEM_INODE] = { "global_bitmap", 0, S_IFREG | 0644 }, | |
223 | ||
224 | /* Slot-specific system inodes (one copy per slot) */ | |
225 | [ORPHAN_DIR_SYSTEM_INODE] = { "orphan_dir:%04d", 0, S_IFDIR | 0755 }, | |
226 | [EXTENT_ALLOC_SYSTEM_INODE] = { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, | |
227 | [INODE_ALLOC_SYSTEM_INODE] = { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, | |
228 | [JOURNAL_SYSTEM_INODE] = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 }, | |
229 | [LOCAL_ALLOC_SYSTEM_INODE] = { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 }, | |
230 | [TRUNCATE_LOG_SYSTEM_INODE] = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 } | |
231 | }; | |
232 | ||
233 | /* Parameter passed from mount.ocfs2 to module */ | |
234 | #define OCFS2_HB_NONE "heartbeat=none" | |
235 | #define OCFS2_HB_LOCAL "heartbeat=local" | |
236 | ||
237 | /* | |
238 | * OCFS2 directory file types. Only the low 3 bits are used. The | |
239 | * other bits are reserved for now. | |
240 | */ | |
241 | #define OCFS2_FT_UNKNOWN 0 | |
242 | #define OCFS2_FT_REG_FILE 1 | |
243 | #define OCFS2_FT_DIR 2 | |
244 | #define OCFS2_FT_CHRDEV 3 | |
245 | #define OCFS2_FT_BLKDEV 4 | |
246 | #define OCFS2_FT_FIFO 5 | |
247 | #define OCFS2_FT_SOCK 6 | |
248 | #define OCFS2_FT_SYMLINK 7 | |
249 | ||
250 | #define OCFS2_FT_MAX 8 | |
251 | ||
252 | /* | |
253 | * OCFS2_DIR_PAD defines the directory entries boundaries | |
254 | * | |
255 | * NOTE: It must be a multiple of 4 | |
256 | */ | |
257 | #define OCFS2_DIR_PAD 4 | |
258 | #define OCFS2_DIR_ROUND (OCFS2_DIR_PAD - 1) | |
259 | #define OCFS2_DIR_MEMBER_LEN offsetof(struct ocfs2_dir_entry, name) | |
260 | #define OCFS2_DIR_REC_LEN(name_len) (((name_len) + OCFS2_DIR_MEMBER_LEN + \ | |
261 | OCFS2_DIR_ROUND) & \ | |
262 | ~OCFS2_DIR_ROUND) | |
263 | ||
264 | #define OCFS2_LINK_MAX 32000 | |
265 | ||
266 | #define S_SHIFT 12 | |
267 | static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = { | |
268 | [S_IFREG >> S_SHIFT] = OCFS2_FT_REG_FILE, | |
269 | [S_IFDIR >> S_SHIFT] = OCFS2_FT_DIR, | |
270 | [S_IFCHR >> S_SHIFT] = OCFS2_FT_CHRDEV, | |
271 | [S_IFBLK >> S_SHIFT] = OCFS2_FT_BLKDEV, | |
272 | [S_IFIFO >> S_SHIFT] = OCFS2_FT_FIFO, | |
273 | [S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK, | |
274 | [S_IFLNK >> S_SHIFT] = OCFS2_FT_SYMLINK, | |
275 | }; | |
276 | ||
277 | ||
278 | /* | |
279 | * Convenience casts | |
280 | */ | |
281 | #define OCFS2_RAW_SB(dinode) (&((dinode)->id2.i_super)) | |
282 | ||
283 | /* | |
284 | * On disk extent record for OCFS2 | |
285 | * It describes a range of clusters on disk. | |
286 | */ | |
287 | struct ocfs2_extent_rec { | |
288 | /*00*/ __le32 e_cpos; /* Offset into the file, in clusters */ | |
289 | __le32 e_clusters; /* Clusters covered by this extent */ | |
290 | __le64 e_blkno; /* Physical disk offset, in blocks */ | |
291 | /*10*/ | |
292 | }; | |
293 | ||
294 | struct ocfs2_chain_rec { | |
295 | __le32 c_free; /* Number of free bits in this chain. */ | |
296 | __le32 c_total; /* Number of total bits in this chain */ | |
297 | __le64 c_blkno; /* Physical disk offset (blocks) of 1st group */ | |
298 | }; | |
299 | ||
300 | struct ocfs2_truncate_rec { | |
301 | __le32 t_start; /* 1st cluster in this log */ | |
302 | __le32 t_clusters; /* Number of total clusters covered */ | |
303 | }; | |
304 | ||
305 | /* | |
306 | * On disk extent list for OCFS2 (node in the tree). Note that this | |
307 | * is contained inside ocfs2_dinode or ocfs2_extent_block, so the | |
308 | * offsets are relative to ocfs2_dinode.id2.i_list or | |
309 | * ocfs2_extent_block.h_list, respectively. | |
310 | */ | |
311 | struct ocfs2_extent_list { | |
312 | /*00*/ __le16 l_tree_depth; /* Extent tree depth from this | |
313 | point. 0 means data extents | |
314 | hang directly off this | |
dcd0538f MF |
315 | header (a leaf) |
316 | NOTE: The high 8 bits cannot be | |
317 | used - tree_depth is never that big. | |
318 | */ | |
ccd979bd MF |
319 | __le16 l_count; /* Number of extent records */ |
320 | __le16 l_next_free_rec; /* Next unused extent slot */ | |
321 | __le16 l_reserved1; | |
322 | __le64 l_reserved2; /* Pad to | |
323 | sizeof(ocfs2_extent_rec) */ | |
324 | /*10*/ struct ocfs2_extent_rec l_recs[0]; /* Extent records */ | |
325 | }; | |
326 | ||
327 | /* | |
328 | * On disk allocation chain list for OCFS2. Note that this is | |
329 | * contained inside ocfs2_dinode, so the offsets are relative to | |
330 | * ocfs2_dinode.id2.i_chain. | |
331 | */ | |
332 | struct ocfs2_chain_list { | |
333 | /*00*/ __le16 cl_cpg; /* Clusters per Block Group */ | |
334 | __le16 cl_bpc; /* Bits per cluster */ | |
335 | __le16 cl_count; /* Total chains in this list */ | |
336 | __le16 cl_next_free_rec; /* Next unused chain slot */ | |
337 | __le64 cl_reserved1; | |
338 | /*10*/ struct ocfs2_chain_rec cl_recs[0]; /* Chain records */ | |
339 | }; | |
340 | ||
341 | /* | |
342 | * On disk deallocation log for OCFS2. Note that this is | |
343 | * contained inside ocfs2_dinode, so the offsets are relative to | |
344 | * ocfs2_dinode.id2.i_dealloc. | |
345 | */ | |
346 | struct ocfs2_truncate_log { | |
347 | /*00*/ __le16 tl_count; /* Total records in this log */ | |
348 | __le16 tl_used; /* Number of records in use */ | |
349 | __le32 tl_reserved1; | |
350 | /*08*/ struct ocfs2_truncate_rec tl_recs[0]; /* Truncate records */ | |
351 | }; | |
352 | ||
353 | /* | |
354 | * On disk extent block (indirect block) for OCFS2 | |
355 | */ | |
356 | struct ocfs2_extent_block | |
357 | { | |
358 | /*00*/ __u8 h_signature[8]; /* Signature for verification */ | |
359 | __le64 h_reserved1; | |
360 | /*10*/ __le16 h_suballoc_slot; /* Slot suballocator this | |
361 | extent_header belongs to */ | |
362 | __le16 h_suballoc_bit; /* Bit offset in suballocator | |
363 | block group */ | |
364 | __le32 h_fs_generation; /* Must match super block */ | |
365 | __le64 h_blkno; /* Offset on disk, in blocks */ | |
366 | /*20*/ __le64 h_reserved3; | |
367 | __le64 h_next_leaf_blk; /* Offset on disk, in blocks, | |
368 | of next leaf header pointing | |
369 | to data */ | |
370 | /*30*/ struct ocfs2_extent_list h_list; /* Extent record list */ | |
371 | /* Actual on-disk size is one block */ | |
372 | }; | |
373 | ||
374 | /* | |
375 | * On disk superblock for OCFS2 | |
376 | * Note that it is contained inside an ocfs2_dinode, so all offsets | |
377 | * are relative to the start of ocfs2_dinode.id2. | |
378 | */ | |
379 | struct ocfs2_super_block { | |
380 | /*00*/ __le16 s_major_rev_level; | |
381 | __le16 s_minor_rev_level; | |
382 | __le16 s_mnt_count; | |
383 | __le16 s_max_mnt_count; | |
384 | __le16 s_state; /* File system state */ | |
385 | __le16 s_errors; /* Behaviour when detecting errors */ | |
386 | __le32 s_checkinterval; /* Max time between checks */ | |
387 | /*10*/ __le64 s_lastcheck; /* Time of last check */ | |
388 | __le32 s_creator_os; /* OS */ | |
389 | __le32 s_feature_compat; /* Compatible feature set */ | |
390 | /*20*/ __le32 s_feature_incompat; /* Incompatible feature set */ | |
391 | __le32 s_feature_ro_compat; /* Readonly-compatible feature set */ | |
392 | __le64 s_root_blkno; /* Offset, in blocks, of root directory | |
393 | dinode */ | |
394 | /*30*/ __le64 s_system_dir_blkno; /* Offset, in blocks, of system | |
395 | directory dinode */ | |
396 | __le32 s_blocksize_bits; /* Blocksize for this fs */ | |
397 | __le32 s_clustersize_bits; /* Clustersize for this fs */ | |
398 | /*40*/ __le16 s_max_slots; /* Max number of simultaneous mounts | |
399 | before tunefs required */ | |
400 | __le16 s_reserved1; | |
401 | __le32 s_reserved2; | |
402 | __le64 s_first_cluster_group; /* Block offset of 1st cluster | |
403 | * group header */ | |
404 | /*50*/ __u8 s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */ | |
405 | /*90*/ __u8 s_uuid[OCFS2_VOL_UUID_LEN]; /* 128-bit uuid */ | |
406 | /*A0*/ | |
407 | }; | |
408 | ||
409 | /* | |
410 | * Local allocation bitmap for OCFS2 slots | |
411 | * Note that it exists inside an ocfs2_dinode, so all offsets are | |
412 | * relative to the start of ocfs2_dinode.id2. | |
413 | */ | |
414 | struct ocfs2_local_alloc | |
415 | { | |
416 | /*00*/ __le32 la_bm_off; /* Starting bit offset in main bitmap */ | |
417 | __le16 la_size; /* Size of included bitmap, in bytes */ | |
418 | __le16 la_reserved1; | |
419 | __le64 la_reserved2; | |
420 | /*10*/ __u8 la_bitmap[0]; | |
421 | }; | |
422 | ||
423 | /* | |
424 | * On disk inode for OCFS2 | |
425 | */ | |
426 | struct ocfs2_dinode { | |
427 | /*00*/ __u8 i_signature[8]; /* Signature for validation */ | |
428 | __le32 i_generation; /* Generation number */ | |
429 | __le16 i_suballoc_slot; /* Slot suballocator this inode | |
430 | belongs to */ | |
431 | __le16 i_suballoc_bit; /* Bit offset in suballocator | |
432 | block group */ | |
433 | /*10*/ __le32 i_reserved0; | |
434 | __le32 i_clusters; /* Cluster count */ | |
435 | __le32 i_uid; /* Owner UID */ | |
436 | __le32 i_gid; /* Owning GID */ | |
437 | /*20*/ __le64 i_size; /* Size in bytes */ | |
438 | __le16 i_mode; /* File mode */ | |
439 | __le16 i_links_count; /* Links count */ | |
440 | __le32 i_flags; /* File flags */ | |
441 | /*30*/ __le64 i_atime; /* Access time */ | |
442 | __le64 i_ctime; /* Creation time */ | |
443 | /*40*/ __le64 i_mtime; /* Modification time */ | |
444 | __le64 i_dtime; /* Deletion time */ | |
445 | /*50*/ __le64 i_blkno; /* Offset on disk, in blocks */ | |
446 | __le64 i_last_eb_blk; /* Pointer to last extent | |
447 | block */ | |
448 | /*60*/ __le32 i_fs_generation; /* Generation per fs-instance */ | |
449 | __le32 i_atime_nsec; | |
450 | __le32 i_ctime_nsec; | |
451 | __le32 i_mtime_nsec; | |
ca4d147e | 452 | __le32 i_attr; |
50008630 TY |
453 | __le16 i_orphaned_slot; /* Only valid when OCFS2_ORPHANED_FL |
454 | was set in i_flags */ | |
455 | __le16 i_reserved1; | |
ca4d147e | 456 | /*70*/ __le64 i_reserved2[8]; |
ccd979bd MF |
457 | /*B8*/ union { |
458 | __le64 i_pad1; /* Generic way to refer to this | |
459 | 64bit union */ | |
460 | struct { | |
461 | __le64 i_rdev; /* Device number */ | |
462 | } dev1; | |
463 | struct { /* Info for bitmap system | |
464 | inodes */ | |
465 | __le32 i_used; /* Bits (ie, clusters) used */ | |
466 | __le32 i_total; /* Total bits (clusters) | |
467 | available */ | |
468 | } bitmap1; | |
469 | struct { /* Info for journal system | |
470 | inodes */ | |
471 | __le32 ij_flags; /* Mounted, version, etc. */ | |
472 | __le32 ij_pad; | |
473 | } journal1; | |
474 | } id1; /* Inode type dependant 1 */ | |
475 | /*C0*/ union { | |
476 | struct ocfs2_super_block i_super; | |
477 | struct ocfs2_local_alloc i_lab; | |
478 | struct ocfs2_chain_list i_chain; | |
479 | struct ocfs2_extent_list i_list; | |
480 | struct ocfs2_truncate_log i_dealloc; | |
481 | __u8 i_symlink[0]; | |
482 | } id2; | |
483 | /* Actual on-disk size is one block */ | |
484 | }; | |
485 | ||
486 | /* | |
487 | * On-disk directory entry structure for OCFS2 | |
488 | * | |
489 | * Packed as this structure could be accessed unaligned on 64-bit platforms | |
490 | */ | |
491 | struct ocfs2_dir_entry { | |
492 | /*00*/ __le64 inode; /* Inode number */ | |
493 | __le16 rec_len; /* Directory entry length */ | |
494 | __u8 name_len; /* Name length */ | |
495 | __u8 file_type; | |
496 | /*0C*/ char name[OCFS2_MAX_FILENAME_LEN]; /* File name */ | |
497 | /* Actual on-disk length specified by rec_len */ | |
498 | } __attribute__ ((packed)); | |
499 | ||
500 | /* | |
501 | * On disk allocator group structure for OCFS2 | |
502 | */ | |
503 | struct ocfs2_group_desc | |
504 | { | |
505 | /*00*/ __u8 bg_signature[8]; /* Signature for validation */ | |
506 | __le16 bg_size; /* Size of included bitmap in | |
507 | bytes. */ | |
508 | __le16 bg_bits; /* Bits represented by this | |
509 | group. */ | |
510 | __le16 bg_free_bits_count; /* Free bits count */ | |
511 | __le16 bg_chain; /* What chain I am in. */ | |
512 | /*10*/ __le32 bg_generation; | |
513 | __le32 bg_reserved1; | |
514 | __le64 bg_next_group; /* Next group in my list, in | |
515 | blocks */ | |
516 | /*20*/ __le64 bg_parent_dinode; /* dinode which owns me, in | |
517 | blocks */ | |
518 | __le64 bg_blkno; /* Offset on disk, in blocks */ | |
519 | /*30*/ __le64 bg_reserved2[2]; | |
520 | /*40*/ __u8 bg_bitmap[0]; | |
521 | }; | |
522 | ||
523 | #ifdef __KERNEL__ | |
524 | static inline int ocfs2_fast_symlink_chars(struct super_block *sb) | |
525 | { | |
526 | return sb->s_blocksize - | |
527 | offsetof(struct ocfs2_dinode, id2.i_symlink); | |
528 | } | |
529 | ||
530 | static inline int ocfs2_extent_recs_per_inode(struct super_block *sb) | |
531 | { | |
532 | int size; | |
533 | ||
534 | size = sb->s_blocksize - | |
535 | offsetof(struct ocfs2_dinode, id2.i_list.l_recs); | |
536 | ||
537 | return size / sizeof(struct ocfs2_extent_rec); | |
538 | } | |
539 | ||
540 | static inline int ocfs2_chain_recs_per_inode(struct super_block *sb) | |
541 | { | |
542 | int size; | |
543 | ||
544 | size = sb->s_blocksize - | |
545 | offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs); | |
546 | ||
547 | return size / sizeof(struct ocfs2_chain_rec); | |
548 | } | |
549 | ||
550 | static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb) | |
551 | { | |
552 | int size; | |
553 | ||
554 | size = sb->s_blocksize - | |
555 | offsetof(struct ocfs2_extent_block, h_list.l_recs); | |
556 | ||
557 | return size / sizeof(struct ocfs2_extent_rec); | |
558 | } | |
559 | ||
560 | static inline u16 ocfs2_local_alloc_size(struct super_block *sb) | |
561 | { | |
562 | u16 size; | |
563 | ||
564 | size = sb->s_blocksize - | |
565 | offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap); | |
566 | ||
567 | return size; | |
568 | } | |
569 | ||
570 | static inline int ocfs2_group_bitmap_size(struct super_block *sb) | |
571 | { | |
572 | int size; | |
573 | ||
574 | size = sb->s_blocksize - | |
575 | offsetof(struct ocfs2_group_desc, bg_bitmap); | |
576 | ||
577 | return size; | |
578 | } | |
579 | ||
580 | static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb) | |
581 | { | |
582 | int size; | |
583 | ||
584 | size = sb->s_blocksize - | |
585 | offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs); | |
586 | ||
587 | return size / sizeof(struct ocfs2_truncate_rec); | |
588 | } | |
50af94b1 MF |
589 | |
590 | static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index) | |
591 | { | |
592 | u64 offset = OCFS2_BACKUP_SB_START; | |
593 | ||
594 | if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) { | |
595 | offset <<= (2 * index); | |
a8a75a20 | 596 | offset >>= sb->s_blocksize_bits; |
50af94b1 MF |
597 | return offset; |
598 | } | |
599 | ||
600 | return 0; | |
601 | ||
602 | } | |
ccd979bd MF |
603 | #else |
604 | static inline int ocfs2_fast_symlink_chars(int blocksize) | |
605 | { | |
606 | return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink); | |
607 | } | |
608 | ||
609 | static inline int ocfs2_extent_recs_per_inode(int blocksize) | |
610 | { | |
611 | int size; | |
612 | ||
613 | size = blocksize - | |
614 | offsetof(struct ocfs2_dinode, id2.i_list.l_recs); | |
615 | ||
616 | return size / sizeof(struct ocfs2_extent_rec); | |
617 | } | |
618 | ||
619 | static inline int ocfs2_chain_recs_per_inode(int blocksize) | |
620 | { | |
621 | int size; | |
622 | ||
623 | size = blocksize - | |
624 | offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs); | |
625 | ||
626 | return size / sizeof(struct ocfs2_chain_rec); | |
627 | } | |
628 | ||
629 | static inline int ocfs2_extent_recs_per_eb(int blocksize) | |
630 | { | |
631 | int size; | |
632 | ||
633 | size = blocksize - | |
634 | offsetof(struct ocfs2_extent_block, h_list.l_recs); | |
635 | ||
636 | return size / sizeof(struct ocfs2_extent_rec); | |
637 | } | |
638 | ||
639 | static inline int ocfs2_local_alloc_size(int blocksize) | |
640 | { | |
641 | int size; | |
642 | ||
643 | size = blocksize - | |
644 | offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap); | |
645 | ||
646 | return size; | |
647 | } | |
648 | ||
649 | static inline int ocfs2_group_bitmap_size(int blocksize) | |
650 | { | |
651 | int size; | |
652 | ||
653 | size = blocksize - | |
654 | offsetof(struct ocfs2_group_desc, bg_bitmap); | |
655 | ||
656 | return size; | |
657 | } | |
658 | ||
659 | static inline int ocfs2_truncate_recs_per_inode(int blocksize) | |
660 | { | |
661 | int size; | |
662 | ||
663 | size = blocksize - | |
664 | offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs); | |
665 | ||
666 | return size / sizeof(struct ocfs2_truncate_rec); | |
667 | } | |
50af94b1 MF |
668 | |
669 | static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index) | |
670 | { | |
671 | uint64_t offset = OCFS2_BACKUP_SB_START; | |
672 | ||
673 | if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) { | |
674 | offset <<= (2 * index); | |
675 | offset /= blocksize; | |
676 | return offset; | |
677 | } | |
678 | ||
679 | return 0; | |
680 | } | |
ccd979bd MF |
681 | #endif /* __KERNEL__ */ |
682 | ||
683 | ||
684 | static inline int ocfs2_system_inode_is_global(int type) | |
685 | { | |
686 | return ((type >= 0) && | |
687 | (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)); | |
688 | } | |
689 | ||
690 | static inline int ocfs2_sprintf_system_inode_name(char *buf, int len, | |
691 | int type, int slot) | |
692 | { | |
693 | int chars; | |
694 | ||
695 | /* | |
696 | * Global system inodes can only have one copy. Everything | |
697 | * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode | |
698 | * list has a copy per slot. | |
699 | */ | |
700 | if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE) | |
701 | chars = snprintf(buf, len, | |
702 | ocfs2_system_inodes[type].si_name); | |
703 | else | |
704 | chars = snprintf(buf, len, | |
705 | ocfs2_system_inodes[type].si_name, | |
706 | slot); | |
707 | ||
708 | return chars; | |
709 | } | |
710 | ||
711 | static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de, | |
712 | umode_t mode) | |
713 | { | |
714 | de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; | |
715 | } | |
716 | ||
717 | #endif /* _OCFS2_FS_H */ | |
718 |