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31#ifndef __UBIFS_KEY_H__
32#define __UBIFS_KEY_H__
33
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39
40
41
42static inline uint32_t key_mask_hash(uint32_t hash)
43{
44 hash &= UBIFS_S_KEY_HASH_MASK;
45 if (unlikely(hash <= 2))
46 hash += 3;
47 return hash;
48}
49
50
51
52
53
54
55static inline uint32_t key_r5_hash(const char *s, int len)
56{
57 uint32_t a = 0;
58 const signed char *str = (const signed char *)s;
59
60 while (len--) {
61 a += *str << 4;
62 a += *str >> 4;
63 a *= 11;
64 str++;
65 }
66
67 return key_mask_hash(a);
68}
69
70
71
72
73
74
75static inline uint32_t key_test_hash(const char *str, int len)
76{
77 uint32_t a = 0;
78
79 len = min_t(uint32_t, len, 4);
80 memcpy(&a, str, len);
81 return key_mask_hash(a);
82}
83
84
85
86
87
88
89
90static inline void ino_key_init(const struct ubifs_info *c,
91 union ubifs_key *key, ino_t inum)
92{
93 key->u32[0] = inum;
94 key->u32[1] = UBIFS_INO_KEY << UBIFS_S_KEY_BLOCK_BITS;
95}
96
97
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100
101
102
103static inline void ino_key_init_flash(const struct ubifs_info *c, void *k,
104 ino_t inum)
105{
106 union ubifs_key *key = k;
107
108 key->j32[0] = cpu_to_le32(inum);
109 key->j32[1] = cpu_to_le32(UBIFS_INO_KEY << UBIFS_S_KEY_BLOCK_BITS);
110 memset(k + 8, 0, UBIFS_MAX_KEY_LEN - 8);
111}
112
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116
117
118
119static inline void lowest_ino_key(const struct ubifs_info *c,
120 union ubifs_key *key, ino_t inum)
121{
122 key->u32[0] = inum;
123 key->u32[1] = 0;
124}
125
126
127
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129
130
131
132static inline void highest_ino_key(const struct ubifs_info *c,
133 union ubifs_key *key, ino_t inum)
134{
135 key->u32[0] = inum;
136 key->u32[1] = 0xffffffff;
137}
138
139
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143
144
145
146static inline void dent_key_init(const struct ubifs_info *c,
147 union ubifs_key *key, ino_t inum,
148 const struct fscrypt_name *nm)
149{
150 uint32_t hash = c->key_hash(fname_name(nm), fname_len(nm));
151
152 ubifs_assert(c, !(hash & ~UBIFS_S_KEY_HASH_MASK));
153 ubifs_assert(c, !nm->hash && !nm->minor_hash);
154 key->u32[0] = inum;
155 key->u32[1] = hash | (UBIFS_DENT_KEY << UBIFS_S_KEY_HASH_BITS);
156}
157
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164
165
166static inline void dent_key_init_hash(const struct ubifs_info *c,
167 union ubifs_key *key, ino_t inum,
168 uint32_t hash)
169{
170 ubifs_assert(c, !(hash & ~UBIFS_S_KEY_HASH_MASK));
171 key->u32[0] = inum;
172 key->u32[1] = hash | (UBIFS_DENT_KEY << UBIFS_S_KEY_HASH_BITS);
173}
174
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180
181
182static inline void dent_key_init_flash(const struct ubifs_info *c, void *k,
183 ino_t inum,
184 const struct fscrypt_name *nm)
185{
186 union ubifs_key *key = k;
187 uint32_t hash = c->key_hash(fname_name(nm), fname_len(nm));
188
189 ubifs_assert(c, !(hash & ~UBIFS_S_KEY_HASH_MASK));
190 key->j32[0] = cpu_to_le32(inum);
191 key->j32[1] = cpu_to_le32(hash |
192 (UBIFS_DENT_KEY << UBIFS_S_KEY_HASH_BITS));
193 memset(k + 8, 0, UBIFS_MAX_KEY_LEN - 8);
194}
195
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200
201
202static inline void lowest_dent_key(const struct ubifs_info *c,
203 union ubifs_key *key, ino_t inum)
204{
205 key->u32[0] = inum;
206 key->u32[1] = UBIFS_DENT_KEY << UBIFS_S_KEY_HASH_BITS;
207}
208
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214
215
216static inline void xent_key_init(const struct ubifs_info *c,
217 union ubifs_key *key, ino_t inum,
218 const struct fscrypt_name *nm)
219{
220 uint32_t hash = c->key_hash(fname_name(nm), fname_len(nm));
221
222 ubifs_assert(c, !(hash & ~UBIFS_S_KEY_HASH_MASK));
223 key->u32[0] = inum;
224 key->u32[1] = hash | (UBIFS_XENT_KEY << UBIFS_S_KEY_HASH_BITS);
225}
226
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232
233
234static inline void xent_key_init_flash(const struct ubifs_info *c, void *k,
235 ino_t inum, const struct fscrypt_name *nm)
236{
237 union ubifs_key *key = k;
238 uint32_t hash = c->key_hash(fname_name(nm), fname_len(nm));
239
240 ubifs_assert(c, !(hash & ~UBIFS_S_KEY_HASH_MASK));
241 key->j32[0] = cpu_to_le32(inum);
242 key->j32[1] = cpu_to_le32(hash |
243 (UBIFS_XENT_KEY << UBIFS_S_KEY_HASH_BITS));
244 memset(k + 8, 0, UBIFS_MAX_KEY_LEN - 8);
245}
246
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251
252
253static inline void lowest_xent_key(const struct ubifs_info *c,
254 union ubifs_key *key, ino_t inum)
255{
256 key->u32[0] = inum;
257 key->u32[1] = UBIFS_XENT_KEY << UBIFS_S_KEY_HASH_BITS;
258}
259
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264
265
266
267static inline void data_key_init(const struct ubifs_info *c,
268 union ubifs_key *key, ino_t inum,
269 unsigned int block)
270{
271 ubifs_assert(c, !(block & ~UBIFS_S_KEY_BLOCK_MASK));
272 key->u32[0] = inum;
273 key->u32[1] = block | (UBIFS_DATA_KEY << UBIFS_S_KEY_BLOCK_BITS);
274}
275
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280
281
282static inline void highest_data_key(const struct ubifs_info *c,
283 union ubifs_key *key, ino_t inum)
284{
285 data_key_init(c, key, inum, UBIFS_S_KEY_BLOCK_MASK);
286}
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296
297static inline void trun_key_init(const struct ubifs_info *c,
298 union ubifs_key *key, ino_t inum)
299{
300 key->u32[0] = inum;
301 key->u32[1] = UBIFS_TRUN_KEY << UBIFS_S_KEY_BLOCK_BITS;
302}
303
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309
310
311static inline void invalid_key_init(const struct ubifs_info *c,
312 union ubifs_key *key)
313{
314 key->u32[0] = 0xDEADBEAF;
315 key->u32[1] = UBIFS_INVALID_KEY;
316}
317
318
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320
321
322
323static inline int key_type(const struct ubifs_info *c,
324 const union ubifs_key *key)
325{
326 return key->u32[1] >> UBIFS_S_KEY_BLOCK_BITS;
327}
328
329
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331
332
333
334static inline int key_type_flash(const struct ubifs_info *c, const void *k)
335{
336 const union ubifs_key *key = k;
337
338 return le32_to_cpu(key->j32[1]) >> UBIFS_S_KEY_BLOCK_BITS;
339}
340
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344
345
346static inline ino_t key_inum(const struct ubifs_info *c, const void *k)
347{
348 const union ubifs_key *key = k;
349
350 return key->u32[0];
351}
352
353
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356
357
358static inline ino_t key_inum_flash(const struct ubifs_info *c, const void *k)
359{
360 const union ubifs_key *key = k;
361
362 return le32_to_cpu(key->j32[0]);
363}
364
365
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367
368
369
370static inline uint32_t key_hash(const struct ubifs_info *c,
371 const union ubifs_key *key)
372{
373 return key->u32[1] & UBIFS_S_KEY_HASH_MASK;
374}
375
376
377
378
379
380
381static inline uint32_t key_hash_flash(const struct ubifs_info *c, const void *k)
382{
383 const union ubifs_key *key = k;
384
385 return le32_to_cpu(key->j32[1]) & UBIFS_S_KEY_HASH_MASK;
386}
387
388
389
390
391
392
393static inline unsigned int key_block(const struct ubifs_info *c,
394 const union ubifs_key *key)
395{
396 return key->u32[1] & UBIFS_S_KEY_BLOCK_MASK;
397}
398
399
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401
402
403
404static inline unsigned int key_block_flash(const struct ubifs_info *c,
405 const void *k)
406{
407 const union ubifs_key *key = k;
408
409 return le32_to_cpu(key->j32[1]) & UBIFS_S_KEY_BLOCK_MASK;
410}
411
412
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415
416
417
418static inline void key_read(const struct ubifs_info *c, const void *from,
419 union ubifs_key *to)
420{
421 const union ubifs_key *f = from;
422
423 to->u32[0] = le32_to_cpu(f->j32[0]);
424 to->u32[1] = le32_to_cpu(f->j32[1]);
425}
426
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429
430
431
432
433static inline void key_write(const struct ubifs_info *c,
434 const union ubifs_key *from, void *to)
435{
436 union ubifs_key *t = to;
437
438 t->j32[0] = cpu_to_le32(from->u32[0]);
439 t->j32[1] = cpu_to_le32(from->u32[1]);
440 memset(to + 8, 0, UBIFS_MAX_KEY_LEN - 8);
441}
442
443
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446
447
448
449static inline void key_write_idx(const struct ubifs_info *c,
450 const union ubifs_key *from, void *to)
451{
452 union ubifs_key *t = to;
453
454 t->j32[0] = cpu_to_le32(from->u32[0]);
455 t->j32[1] = cpu_to_le32(from->u32[1]);
456}
457
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462
463
464static inline void key_copy(const struct ubifs_info *c,
465 const union ubifs_key *from, union ubifs_key *to)
466{
467 to->u64[0] = from->u64[0];
468}
469
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477
478
479static inline int keys_cmp(const struct ubifs_info *c,
480 const union ubifs_key *key1,
481 const union ubifs_key *key2)
482{
483 if (key1->u32[0] < key2->u32[0])
484 return -1;
485 if (key1->u32[0] > key2->u32[0])
486 return 1;
487 if (key1->u32[1] < key2->u32[1])
488 return -1;
489 if (key1->u32[1] > key2->u32[1])
490 return 1;
491
492 return 0;
493}
494
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503
504static inline int keys_eq(const struct ubifs_info *c,
505 const union ubifs_key *key1,
506 const union ubifs_key *key2)
507{
508 if (key1->u32[0] != key2->u32[0])
509 return 0;
510 if (key1->u32[1] != key2->u32[1])
511 return 0;
512 return 1;
513}
514
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519
520
521
522static inline int is_hash_key(const struct ubifs_info *c,
523 const union ubifs_key *key)
524{
525 int type = key_type(c, key);
526
527 return type == UBIFS_DENT_KEY || type == UBIFS_XENT_KEY;
528}
529
530
531
532
533
534static inline unsigned long long key_max_inode_size(const struct ubifs_info *c)
535{
536 switch (c->key_fmt) {
537 case UBIFS_SIMPLE_KEY_FMT:
538 return (1ULL << UBIFS_S_KEY_BLOCK_BITS) * UBIFS_BLOCK_SIZE;
539 default:
540 return 0;
541 }
542}
543
544#endif
545