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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 | ||
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 | ||
e48edee2 MF |
158 | /* |
159 | * Extent record flags (e_node.leaf.flags) | |
160 | */ | |
161 | #define OCFS2_EXT_UNWRITTEN (0x01) /* Extent is allocated but | |
162 | * unwritten */ | |
163 | ||
ca4d147e HP |
164 | /* |
165 | * ioctl commands | |
166 | */ | |
167 | #define OCFS2_IOC_GETFLAGS _IOR('f', 1, long) | |
168 | #define OCFS2_IOC_SETFLAGS _IOW('f', 2, long) | |
169 | ||
ccd979bd MF |
170 | /* |
171 | * Journal Flags (ocfs2_dinode.id1.journal1.i_flags) | |
172 | */ | |
173 | #define OCFS2_JOURNAL_DIRTY_FL (0x00000001) /* Journal needs recovery */ | |
174 | ||
175 | /* | |
176 | * superblock s_state flags | |
177 | */ | |
178 | #define OCFS2_ERROR_FS (0x00000001) /* FS saw errors */ | |
179 | ||
180 | /* Limit of space in ocfs2_dir_entry */ | |
181 | #define OCFS2_MAX_FILENAME_LEN 255 | |
182 | ||
183 | /* Maximum slots on an ocfs2 file system */ | |
184 | #define OCFS2_MAX_SLOTS 255 | |
185 | ||
186 | /* Slot map indicator for an empty slot */ | |
187 | #define OCFS2_INVALID_SLOT -1 | |
188 | ||
189 | #define OCFS2_VOL_UUID_LEN 16 | |
190 | #define OCFS2_MAX_VOL_LABEL_LEN 64 | |
191 | ||
192 | /* Journal limits (in bytes) */ | |
193 | #define OCFS2_MIN_JOURNAL_SIZE (4 * 1024 * 1024) | |
ccd979bd MF |
194 | |
195 | struct ocfs2_system_inode_info { | |
196 | char *si_name; | |
197 | int si_iflags; | |
198 | int si_mode; | |
199 | }; | |
200 | ||
201 | /* System file index */ | |
202 | enum { | |
203 | BAD_BLOCK_SYSTEM_INODE = 0, | |
204 | GLOBAL_INODE_ALLOC_SYSTEM_INODE, | |
205 | SLOT_MAP_SYSTEM_INODE, | |
206 | #define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE | |
207 | HEARTBEAT_SYSTEM_INODE, | |
208 | GLOBAL_BITMAP_SYSTEM_INODE, | |
209 | #define OCFS2_LAST_GLOBAL_SYSTEM_INODE GLOBAL_BITMAP_SYSTEM_INODE | |
210 | ORPHAN_DIR_SYSTEM_INODE, | |
211 | EXTENT_ALLOC_SYSTEM_INODE, | |
212 | INODE_ALLOC_SYSTEM_INODE, | |
213 | JOURNAL_SYSTEM_INODE, | |
214 | LOCAL_ALLOC_SYSTEM_INODE, | |
215 | TRUNCATE_LOG_SYSTEM_INODE, | |
216 | NUM_SYSTEM_INODES | |
217 | }; | |
218 | ||
219 | static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = { | |
220 | /* Global system inodes (single copy) */ | |
221 | /* The first two are only used from userspace mfks/tunefs */ | |
222 | [BAD_BLOCK_SYSTEM_INODE] = { "bad_blocks", 0, S_IFREG | 0644 }, | |
223 | [GLOBAL_INODE_ALLOC_SYSTEM_INODE] = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, | |
224 | ||
225 | /* These are used by the running filesystem */ | |
226 | [SLOT_MAP_SYSTEM_INODE] = { "slot_map", 0, S_IFREG | 0644 }, | |
227 | [HEARTBEAT_SYSTEM_INODE] = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 }, | |
228 | [GLOBAL_BITMAP_SYSTEM_INODE] = { "global_bitmap", 0, S_IFREG | 0644 }, | |
229 | ||
230 | /* Slot-specific system inodes (one copy per slot) */ | |
231 | [ORPHAN_DIR_SYSTEM_INODE] = { "orphan_dir:%04d", 0, S_IFDIR | 0755 }, | |
232 | [EXTENT_ALLOC_SYSTEM_INODE] = { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, | |
233 | [INODE_ALLOC_SYSTEM_INODE] = { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 }, | |
234 | [JOURNAL_SYSTEM_INODE] = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 }, | |
235 | [LOCAL_ALLOC_SYSTEM_INODE] = { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 }, | |
236 | [TRUNCATE_LOG_SYSTEM_INODE] = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 } | |
237 | }; | |
238 | ||
239 | /* Parameter passed from mount.ocfs2 to module */ | |
240 | #define OCFS2_HB_NONE "heartbeat=none" | |
241 | #define OCFS2_HB_LOCAL "heartbeat=local" | |
242 | ||
243 | /* | |
244 | * OCFS2 directory file types. Only the low 3 bits are used. The | |
245 | * other bits are reserved for now. | |
246 | */ | |
247 | #define OCFS2_FT_UNKNOWN 0 | |
248 | #define OCFS2_FT_REG_FILE 1 | |
249 | #define OCFS2_FT_DIR 2 | |
250 | #define OCFS2_FT_CHRDEV 3 | |
251 | #define OCFS2_FT_BLKDEV 4 | |
252 | #define OCFS2_FT_FIFO 5 | |
253 | #define OCFS2_FT_SOCK 6 | |
254 | #define OCFS2_FT_SYMLINK 7 | |
255 | ||
256 | #define OCFS2_FT_MAX 8 | |
257 | ||
258 | /* | |
259 | * OCFS2_DIR_PAD defines the directory entries boundaries | |
260 | * | |
261 | * NOTE: It must be a multiple of 4 | |
262 | */ | |
263 | #define OCFS2_DIR_PAD 4 | |
264 | #define OCFS2_DIR_ROUND (OCFS2_DIR_PAD - 1) | |
265 | #define OCFS2_DIR_MEMBER_LEN offsetof(struct ocfs2_dir_entry, name) | |
266 | #define OCFS2_DIR_REC_LEN(name_len) (((name_len) + OCFS2_DIR_MEMBER_LEN + \ | |
267 | OCFS2_DIR_ROUND) & \ | |
268 | ~OCFS2_DIR_ROUND) | |
269 | ||
270 | #define OCFS2_LINK_MAX 32000 | |
271 | ||
272 | #define S_SHIFT 12 | |
273 | static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = { | |
274 | [S_IFREG >> S_SHIFT] = OCFS2_FT_REG_FILE, | |
275 | [S_IFDIR >> S_SHIFT] = OCFS2_FT_DIR, | |
276 | [S_IFCHR >> S_SHIFT] = OCFS2_FT_CHRDEV, | |
277 | [S_IFBLK >> S_SHIFT] = OCFS2_FT_BLKDEV, | |
278 | [S_IFIFO >> S_SHIFT] = OCFS2_FT_FIFO, | |
279 | [S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK, | |
280 | [S_IFLNK >> S_SHIFT] = OCFS2_FT_SYMLINK, | |
281 | }; | |
282 | ||
283 | ||
284 | /* | |
285 | * Convenience casts | |
286 | */ | |
287 | #define OCFS2_RAW_SB(dinode) (&((dinode)->id2.i_super)) | |
288 | ||
289 | /* | |
290 | * On disk extent record for OCFS2 | |
291 | * It describes a range of clusters on disk. | |
e48edee2 MF |
292 | * |
293 | * Length fields are divided into interior and leaf node versions. | |
294 | * This leaves room for a flags field (OCFS2_EXT_*) in the leaf nodes. | |
ccd979bd MF |
295 | */ |
296 | struct ocfs2_extent_rec { | |
297 | /*00*/ __le32 e_cpos; /* Offset into the file, in clusters */ | |
e48edee2 MF |
298 | union { |
299 | __le32 e_int_clusters; /* Clusters covered by all children */ | |
300 | struct { | |
301 | __le16 e_leaf_clusters; /* Clusters covered by this | |
302 | extent */ | |
303 | __u8 e_reserved1; | |
304 | __u8 e_flags; /* Extent flags */ | |
305 | }; | |
306 | }; | |
ccd979bd MF |
307 | __le64 e_blkno; /* Physical disk offset, in blocks */ |
308 | /*10*/ | |
309 | }; | |
310 | ||
311 | struct ocfs2_chain_rec { | |
312 | __le32 c_free; /* Number of free bits in this chain. */ | |
313 | __le32 c_total; /* Number of total bits in this chain */ | |
314 | __le64 c_blkno; /* Physical disk offset (blocks) of 1st group */ | |
315 | }; | |
316 | ||
317 | struct ocfs2_truncate_rec { | |
318 | __le32 t_start; /* 1st cluster in this log */ | |
319 | __le32 t_clusters; /* Number of total clusters covered */ | |
320 | }; | |
321 | ||
322 | /* | |
323 | * On disk extent list for OCFS2 (node in the tree). Note that this | |
324 | * is contained inside ocfs2_dinode or ocfs2_extent_block, so the | |
325 | * offsets are relative to ocfs2_dinode.id2.i_list or | |
326 | * ocfs2_extent_block.h_list, respectively. | |
327 | */ | |
328 | struct ocfs2_extent_list { | |
329 | /*00*/ __le16 l_tree_depth; /* Extent tree depth from this | |
330 | point. 0 means data extents | |
331 | hang directly off this | |
dcd0538f MF |
332 | header (a leaf) |
333 | NOTE: The high 8 bits cannot be | |
334 | used - tree_depth is never that big. | |
335 | */ | |
ccd979bd MF |
336 | __le16 l_count; /* Number of extent records */ |
337 | __le16 l_next_free_rec; /* Next unused extent slot */ | |
338 | __le16 l_reserved1; | |
339 | __le64 l_reserved2; /* Pad to | |
340 | sizeof(ocfs2_extent_rec) */ | |
341 | /*10*/ struct ocfs2_extent_rec l_recs[0]; /* Extent records */ | |
342 | }; | |
343 | ||
344 | /* | |
345 | * On disk allocation chain list for OCFS2. Note that this is | |
346 | * contained inside ocfs2_dinode, so the offsets are relative to | |
347 | * ocfs2_dinode.id2.i_chain. | |
348 | */ | |
349 | struct ocfs2_chain_list { | |
350 | /*00*/ __le16 cl_cpg; /* Clusters per Block Group */ | |
351 | __le16 cl_bpc; /* Bits per cluster */ | |
352 | __le16 cl_count; /* Total chains in this list */ | |
353 | __le16 cl_next_free_rec; /* Next unused chain slot */ | |
354 | __le64 cl_reserved1; | |
355 | /*10*/ struct ocfs2_chain_rec cl_recs[0]; /* Chain records */ | |
356 | }; | |
357 | ||
358 | /* | |
359 | * On disk deallocation log for OCFS2. Note that this is | |
360 | * contained inside ocfs2_dinode, so the offsets are relative to | |
361 | * ocfs2_dinode.id2.i_dealloc. | |
362 | */ | |
363 | struct ocfs2_truncate_log { | |
364 | /*00*/ __le16 tl_count; /* Total records in this log */ | |
365 | __le16 tl_used; /* Number of records in use */ | |
366 | __le32 tl_reserved1; | |
367 | /*08*/ struct ocfs2_truncate_rec tl_recs[0]; /* Truncate records */ | |
368 | }; | |
369 | ||
370 | /* | |
371 | * On disk extent block (indirect block) for OCFS2 | |
372 | */ | |
373 | struct ocfs2_extent_block | |
374 | { | |
375 | /*00*/ __u8 h_signature[8]; /* Signature for verification */ | |
376 | __le64 h_reserved1; | |
377 | /*10*/ __le16 h_suballoc_slot; /* Slot suballocator this | |
378 | extent_header belongs to */ | |
379 | __le16 h_suballoc_bit; /* Bit offset in suballocator | |
380 | block group */ | |
381 | __le32 h_fs_generation; /* Must match super block */ | |
382 | __le64 h_blkno; /* Offset on disk, in blocks */ | |
383 | /*20*/ __le64 h_reserved3; | |
384 | __le64 h_next_leaf_blk; /* Offset on disk, in blocks, | |
385 | of next leaf header pointing | |
386 | to data */ | |
387 | /*30*/ struct ocfs2_extent_list h_list; /* Extent record list */ | |
388 | /* Actual on-disk size is one block */ | |
389 | }; | |
390 | ||
391 | /* | |
392 | * On disk superblock for OCFS2 | |
393 | * Note that it is contained inside an ocfs2_dinode, so all offsets | |
394 | * are relative to the start of ocfs2_dinode.id2. | |
395 | */ | |
396 | struct ocfs2_super_block { | |
397 | /*00*/ __le16 s_major_rev_level; | |
398 | __le16 s_minor_rev_level; | |
399 | __le16 s_mnt_count; | |
400 | __le16 s_max_mnt_count; | |
401 | __le16 s_state; /* File system state */ | |
402 | __le16 s_errors; /* Behaviour when detecting errors */ | |
403 | __le32 s_checkinterval; /* Max time between checks */ | |
404 | /*10*/ __le64 s_lastcheck; /* Time of last check */ | |
405 | __le32 s_creator_os; /* OS */ | |
406 | __le32 s_feature_compat; /* Compatible feature set */ | |
407 | /*20*/ __le32 s_feature_incompat; /* Incompatible feature set */ | |
408 | __le32 s_feature_ro_compat; /* Readonly-compatible feature set */ | |
409 | __le64 s_root_blkno; /* Offset, in blocks, of root directory | |
410 | dinode */ | |
411 | /*30*/ __le64 s_system_dir_blkno; /* Offset, in blocks, of system | |
412 | directory dinode */ | |
413 | __le32 s_blocksize_bits; /* Blocksize for this fs */ | |
414 | __le32 s_clustersize_bits; /* Clustersize for this fs */ | |
415 | /*40*/ __le16 s_max_slots; /* Max number of simultaneous mounts | |
416 | before tunefs required */ | |
417 | __le16 s_reserved1; | |
418 | __le32 s_reserved2; | |
419 | __le64 s_first_cluster_group; /* Block offset of 1st cluster | |
420 | * group header */ | |
421 | /*50*/ __u8 s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */ | |
422 | /*90*/ __u8 s_uuid[OCFS2_VOL_UUID_LEN]; /* 128-bit uuid */ | |
423 | /*A0*/ | |
424 | }; | |
425 | ||
426 | /* | |
427 | * Local allocation bitmap for OCFS2 slots | |
428 | * Note that it exists inside an ocfs2_dinode, so all offsets are | |
429 | * relative to the start of ocfs2_dinode.id2. | |
430 | */ | |
431 | struct ocfs2_local_alloc | |
432 | { | |
433 | /*00*/ __le32 la_bm_off; /* Starting bit offset in main bitmap */ | |
434 | __le16 la_size; /* Size of included bitmap, in bytes */ | |
435 | __le16 la_reserved1; | |
436 | __le64 la_reserved2; | |
437 | /*10*/ __u8 la_bitmap[0]; | |
438 | }; | |
439 | ||
440 | /* | |
441 | * On disk inode for OCFS2 | |
442 | */ | |
443 | struct ocfs2_dinode { | |
444 | /*00*/ __u8 i_signature[8]; /* Signature for validation */ | |
445 | __le32 i_generation; /* Generation number */ | |
446 | __le16 i_suballoc_slot; /* Slot suballocator this inode | |
447 | belongs to */ | |
448 | __le16 i_suballoc_bit; /* Bit offset in suballocator | |
449 | block group */ | |
450 | /*10*/ __le32 i_reserved0; | |
451 | __le32 i_clusters; /* Cluster count */ | |
452 | __le32 i_uid; /* Owner UID */ | |
453 | __le32 i_gid; /* Owning GID */ | |
454 | /*20*/ __le64 i_size; /* Size in bytes */ | |
455 | __le16 i_mode; /* File mode */ | |
456 | __le16 i_links_count; /* Links count */ | |
457 | __le32 i_flags; /* File flags */ | |
458 | /*30*/ __le64 i_atime; /* Access time */ | |
459 | __le64 i_ctime; /* Creation time */ | |
460 | /*40*/ __le64 i_mtime; /* Modification time */ | |
461 | __le64 i_dtime; /* Deletion time */ | |
462 | /*50*/ __le64 i_blkno; /* Offset on disk, in blocks */ | |
463 | __le64 i_last_eb_blk; /* Pointer to last extent | |
464 | block */ | |
465 | /*60*/ __le32 i_fs_generation; /* Generation per fs-instance */ | |
466 | __le32 i_atime_nsec; | |
467 | __le32 i_ctime_nsec; | |
468 | __le32 i_mtime_nsec; | |
ca4d147e | 469 | __le32 i_attr; |
50008630 TY |
470 | __le16 i_orphaned_slot; /* Only valid when OCFS2_ORPHANED_FL |
471 | was set in i_flags */ | |
472 | __le16 i_reserved1; | |
ca4d147e | 473 | /*70*/ __le64 i_reserved2[8]; |
ccd979bd MF |
474 | /*B8*/ union { |
475 | __le64 i_pad1; /* Generic way to refer to this | |
476 | 64bit union */ | |
477 | struct { | |
478 | __le64 i_rdev; /* Device number */ | |
479 | } dev1; | |
480 | struct { /* Info for bitmap system | |
481 | inodes */ | |
482 | __le32 i_used; /* Bits (ie, clusters) used */ | |
483 | __le32 i_total; /* Total bits (clusters) | |
484 | available */ | |
485 | } bitmap1; | |
486 | struct { /* Info for journal system | |
487 | inodes */ | |
488 | __le32 ij_flags; /* Mounted, version, etc. */ | |
489 | __le32 ij_pad; | |
490 | } journal1; | |
491 | } id1; /* Inode type dependant 1 */ | |
492 | /*C0*/ union { | |
493 | struct ocfs2_super_block i_super; | |
494 | struct ocfs2_local_alloc i_lab; | |
495 | struct ocfs2_chain_list i_chain; | |
496 | struct ocfs2_extent_list i_list; | |
497 | struct ocfs2_truncate_log i_dealloc; | |
498 | __u8 i_symlink[0]; | |
499 | } id2; | |
500 | /* Actual on-disk size is one block */ | |
501 | }; | |
502 | ||
503 | /* | |
504 | * On-disk directory entry structure for OCFS2 | |
505 | * | |
506 | * Packed as this structure could be accessed unaligned on 64-bit platforms | |
507 | */ | |
508 | struct ocfs2_dir_entry { | |
509 | /*00*/ __le64 inode; /* Inode number */ | |
510 | __le16 rec_len; /* Directory entry length */ | |
511 | __u8 name_len; /* Name length */ | |
512 | __u8 file_type; | |
513 | /*0C*/ char name[OCFS2_MAX_FILENAME_LEN]; /* File name */ | |
514 | /* Actual on-disk length specified by rec_len */ | |
515 | } __attribute__ ((packed)); | |
516 | ||
517 | /* | |
518 | * On disk allocator group structure for OCFS2 | |
519 | */ | |
520 | struct ocfs2_group_desc | |
521 | { | |
522 | /*00*/ __u8 bg_signature[8]; /* Signature for validation */ | |
523 | __le16 bg_size; /* Size of included bitmap in | |
524 | bytes. */ | |
525 | __le16 bg_bits; /* Bits represented by this | |
526 | group. */ | |
527 | __le16 bg_free_bits_count; /* Free bits count */ | |
528 | __le16 bg_chain; /* What chain I am in. */ | |
529 | /*10*/ __le32 bg_generation; | |
530 | __le32 bg_reserved1; | |
531 | __le64 bg_next_group; /* Next group in my list, in | |
532 | blocks */ | |
533 | /*20*/ __le64 bg_parent_dinode; /* dinode which owns me, in | |
534 | blocks */ | |
535 | __le64 bg_blkno; /* Offset on disk, in blocks */ | |
536 | /*30*/ __le64 bg_reserved2[2]; | |
537 | /*40*/ __u8 bg_bitmap[0]; | |
538 | }; | |
539 | ||
540 | #ifdef __KERNEL__ | |
541 | static inline int ocfs2_fast_symlink_chars(struct super_block *sb) | |
542 | { | |
543 | return sb->s_blocksize - | |
544 | offsetof(struct ocfs2_dinode, id2.i_symlink); | |
545 | } | |
546 | ||
547 | static inline int ocfs2_extent_recs_per_inode(struct super_block *sb) | |
548 | { | |
549 | int size; | |
550 | ||
551 | size = sb->s_blocksize - | |
552 | offsetof(struct ocfs2_dinode, id2.i_list.l_recs); | |
553 | ||
554 | return size / sizeof(struct ocfs2_extent_rec); | |
555 | } | |
556 | ||
557 | static inline int ocfs2_chain_recs_per_inode(struct super_block *sb) | |
558 | { | |
559 | int size; | |
560 | ||
561 | size = sb->s_blocksize - | |
562 | offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs); | |
563 | ||
564 | return size / sizeof(struct ocfs2_chain_rec); | |
565 | } | |
566 | ||
567 | static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb) | |
568 | { | |
569 | int size; | |
570 | ||
571 | size = sb->s_blocksize - | |
572 | offsetof(struct ocfs2_extent_block, h_list.l_recs); | |
573 | ||
574 | return size / sizeof(struct ocfs2_extent_rec); | |
575 | } | |
576 | ||
577 | static inline u16 ocfs2_local_alloc_size(struct super_block *sb) | |
578 | { | |
579 | u16 size; | |
580 | ||
581 | size = sb->s_blocksize - | |
582 | offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap); | |
583 | ||
584 | return size; | |
585 | } | |
586 | ||
587 | static inline int ocfs2_group_bitmap_size(struct super_block *sb) | |
588 | { | |
589 | int size; | |
590 | ||
591 | size = sb->s_blocksize - | |
592 | offsetof(struct ocfs2_group_desc, bg_bitmap); | |
593 | ||
594 | return size; | |
595 | } | |
596 | ||
597 | static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb) | |
598 | { | |
599 | int size; | |
600 | ||
601 | size = sb->s_blocksize - | |
602 | offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs); | |
603 | ||
604 | return size / sizeof(struct ocfs2_truncate_rec); | |
605 | } | |
50af94b1 MF |
606 | |
607 | static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index) | |
608 | { | |
609 | u64 offset = OCFS2_BACKUP_SB_START; | |
610 | ||
611 | if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) { | |
612 | offset <<= (2 * index); | |
a8a75a20 | 613 | offset >>= sb->s_blocksize_bits; |
50af94b1 MF |
614 | return offset; |
615 | } | |
616 | ||
617 | return 0; | |
618 | ||
619 | } | |
ccd979bd MF |
620 | #else |
621 | static inline int ocfs2_fast_symlink_chars(int blocksize) | |
622 | { | |
623 | return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink); | |
624 | } | |
625 | ||
626 | static inline int ocfs2_extent_recs_per_inode(int blocksize) | |
627 | { | |
628 | int size; | |
629 | ||
630 | size = blocksize - | |
631 | offsetof(struct ocfs2_dinode, id2.i_list.l_recs); | |
632 | ||
633 | return size / sizeof(struct ocfs2_extent_rec); | |
634 | } | |
635 | ||
636 | static inline int ocfs2_chain_recs_per_inode(int blocksize) | |
637 | { | |
638 | int size; | |
639 | ||
640 | size = blocksize - | |
641 | offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs); | |
642 | ||
643 | return size / sizeof(struct ocfs2_chain_rec); | |
644 | } | |
645 | ||
646 | static inline int ocfs2_extent_recs_per_eb(int blocksize) | |
647 | { | |
648 | int size; | |
649 | ||
650 | size = blocksize - | |
651 | offsetof(struct ocfs2_extent_block, h_list.l_recs); | |
652 | ||
653 | return size / sizeof(struct ocfs2_extent_rec); | |
654 | } | |
655 | ||
656 | static inline int ocfs2_local_alloc_size(int blocksize) | |
657 | { | |
658 | int size; | |
659 | ||
660 | size = blocksize - | |
661 | offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap); | |
662 | ||
663 | return size; | |
664 | } | |
665 | ||
666 | static inline int ocfs2_group_bitmap_size(int blocksize) | |
667 | { | |
668 | int size; | |
669 | ||
670 | size = blocksize - | |
671 | offsetof(struct ocfs2_group_desc, bg_bitmap); | |
672 | ||
673 | return size; | |
674 | } | |
675 | ||
676 | static inline int ocfs2_truncate_recs_per_inode(int blocksize) | |
677 | { | |
678 | int size; | |
679 | ||
680 | size = blocksize - | |
681 | offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs); | |
682 | ||
683 | return size / sizeof(struct ocfs2_truncate_rec); | |
684 | } | |
50af94b1 MF |
685 | |
686 | static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index) | |
687 | { | |
688 | uint64_t offset = OCFS2_BACKUP_SB_START; | |
689 | ||
690 | if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) { | |
691 | offset <<= (2 * index); | |
692 | offset /= blocksize; | |
693 | return offset; | |
694 | } | |
695 | ||
696 | return 0; | |
697 | } | |
ccd979bd MF |
698 | #endif /* __KERNEL__ */ |
699 | ||
700 | ||
701 | static inline int ocfs2_system_inode_is_global(int type) | |
702 | { | |
703 | return ((type >= 0) && | |
704 | (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)); | |
705 | } | |
706 | ||
707 | static inline int ocfs2_sprintf_system_inode_name(char *buf, int len, | |
708 | int type, int slot) | |
709 | { | |
710 | int chars; | |
711 | ||
712 | /* | |
713 | * Global system inodes can only have one copy. Everything | |
714 | * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode | |
715 | * list has a copy per slot. | |
716 | */ | |
717 | if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE) | |
718 | chars = snprintf(buf, len, | |
719 | ocfs2_system_inodes[type].si_name); | |
720 | else | |
721 | chars = snprintf(buf, len, | |
722 | ocfs2_system_inodes[type].si_name, | |
723 | slot); | |
724 | ||
725 | return chars; | |
726 | } | |
727 | ||
728 | static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de, | |
729 | umode_t mode) | |
730 | { | |
731 | de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; | |
732 | } | |
733 | ||
734 | #endif /* _OCFS2_FS_H */ | |
735 |