1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or https://opensource.org/licenses/CDDL-1.0.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright (c) 2011, 2018 by Delphix. All rights reserved.
25 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
26 * Copyright 2017 Nexenta Systems, Inc.
27 */
28
29 #include <sys/zio.h>
30 #include <sys/spa.h>
31 #include <sys/dmu.h>
32 #include <sys/zfs_context.h>
33 #include <sys/zap.h>
34 #include <sys/zap_impl.h>
35 #include <sys/zap_leaf.h>
36 #include <sys/btree.h>
37 #include <sys/arc.h>
38 #include <sys/dmu_objset.h>
39
40 #ifdef _KERNEL
41 #include <sys/sunddi.h>
42 #endif
43
44 int zap_micro_max_size = MZAP_MAX_BLKSZ;
45
46 static int mzap_upgrade(zap_t **zapp,
47 const void *tag, dmu_tx_t *tx, zap_flags_t flags);
48
49 uint64_t
zap_getflags(zap_t * zap)50 zap_getflags(zap_t *zap)
51 {
52 if (zap->zap_ismicro)
53 return (0);
54 return (zap_f_phys(zap)->zap_flags);
55 }
56
57 int
zap_hashbits(zap_t * zap)58 zap_hashbits(zap_t *zap)
59 {
60 if (zap_getflags(zap) & ZAP_FLAG_HASH64)
61 return (48);
62 else
63 return (28);
64 }
65
66 uint32_t
zap_maxcd(zap_t * zap)67 zap_maxcd(zap_t *zap)
68 {
69 if (zap_getflags(zap) & ZAP_FLAG_HASH64)
70 return ((1<<16)-1);
71 else
72 return (-1U);
73 }
74
75 static uint64_t
zap_hash(zap_name_t * zn)76 zap_hash(zap_name_t *zn)
77 {
78 zap_t *zap = zn->zn_zap;
79 uint64_t h = 0;
80
81 if (zap_getflags(zap) & ZAP_FLAG_PRE_HASHED_KEY) {
82 ASSERT(zap_getflags(zap) & ZAP_FLAG_UINT64_KEY);
83 h = *(uint64_t *)zn->zn_key_orig;
84 } else {
85 h = zap->zap_salt;
86 ASSERT(h != 0);
87 ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY);
88
89 if (zap_getflags(zap) & ZAP_FLAG_UINT64_KEY) {
90 const uint64_t *wp = zn->zn_key_norm;
91
92 ASSERT(zn->zn_key_intlen == 8);
93 for (int i = 0; i < zn->zn_key_norm_numints;
94 wp++, i++) {
95 uint64_t word = *wp;
96
97 for (int j = 0; j < 8; j++) {
98 h = (h >> 8) ^
99 zfs_crc64_table[(h ^ word) & 0xFF];
100 word >>= NBBY;
101 }
102 }
103 } else {
104 const uint8_t *cp = zn->zn_key_norm;
105
106 /*
107 * We previously stored the terminating null on
108 * disk, but didn't hash it, so we need to
109 * continue to not hash it. (The
110 * zn_key_*_numints includes the terminating
111 * null for non-binary keys.)
112 */
113 int len = zn->zn_key_norm_numints - 1;
114
115 ASSERT(zn->zn_key_intlen == 1);
116 for (int i = 0; i < len; cp++, i++) {
117 h = (h >> 8) ^
118 zfs_crc64_table[(h ^ *cp) & 0xFF];
119 }
120 }
121 }
122 /*
123 * Don't use all 64 bits, since we need some in the cookie for
124 * the collision differentiator. We MUST use the high bits,
125 * since those are the ones that we first pay attention to when
126 * choosing the bucket.
127 */
128 h &= ~((1ULL << (64 - zap_hashbits(zap))) - 1);
129
130 return (h);
131 }
132
133 static int
zap_normalize(zap_t * zap,const char * name,char * namenorm,int normflags)134 zap_normalize(zap_t *zap, const char *name, char *namenorm, int normflags)
135 {
136 ASSERT(!(zap_getflags(zap) & ZAP_FLAG_UINT64_KEY));
137
138 size_t inlen = strlen(name) + 1;
139 size_t outlen = ZAP_MAXNAMELEN;
140
141 int err = 0;
142 (void) u8_textprep_str((char *)name, &inlen, namenorm, &outlen,
143 normflags | U8_TEXTPREP_IGNORE_NULL | U8_TEXTPREP_IGNORE_INVALID,
144 U8_UNICODE_LATEST, &err);
145
146 return (err);
147 }
148
149 boolean_t
zap_match(zap_name_t * zn,const char * matchname)150 zap_match(zap_name_t *zn, const char *matchname)
151 {
152 ASSERT(!(zap_getflags(zn->zn_zap) & ZAP_FLAG_UINT64_KEY));
153
154 if (zn->zn_matchtype & MT_NORMALIZE) {
155 char norm[ZAP_MAXNAMELEN];
156
157 if (zap_normalize(zn->zn_zap, matchname, norm,
158 zn->zn_normflags) != 0)
159 return (B_FALSE);
160
161 return (strcmp(zn->zn_key_norm, norm) == 0);
162 } else {
163 return (strcmp(zn->zn_key_orig, matchname) == 0);
164 }
165 }
166
167 static zap_name_t *
zap_name_alloc(zap_t * zap)168 zap_name_alloc(zap_t *zap)
169 {
170 zap_name_t *zn = kmem_alloc(sizeof (zap_name_t), KM_SLEEP);
171 zn->zn_zap = zap;
172 return (zn);
173 }
174
175 void
zap_name_free(zap_name_t * zn)176 zap_name_free(zap_name_t *zn)
177 {
178 kmem_free(zn, sizeof (zap_name_t));
179 }
180
181 static int
zap_name_init_str(zap_name_t * zn,const char * key,matchtype_t mt)182 zap_name_init_str(zap_name_t *zn, const char *key, matchtype_t mt)
183 {
184 zap_t *zap = zn->zn_zap;
185
186 zn->zn_key_intlen = sizeof (*key);
187 zn->zn_key_orig = key;
188 zn->zn_key_orig_numints = strlen(zn->zn_key_orig) + 1;
189 zn->zn_matchtype = mt;
190 zn->zn_normflags = zap->zap_normflags;
191
192 /*
193 * If we're dealing with a case sensitive lookup on a mixed or
194 * insensitive fs, remove U8_TEXTPREP_TOUPPER or the lookup
195 * will fold case to all caps overriding the lookup request.
196 */
197 if (mt & MT_MATCH_CASE)
198 zn->zn_normflags &= ~U8_TEXTPREP_TOUPPER;
199
200 if (zap->zap_normflags) {
201 /*
202 * We *must* use zap_normflags because this normalization is
203 * what the hash is computed from.
204 */
205 if (zap_normalize(zap, key, zn->zn_normbuf,
206 zap->zap_normflags) != 0)
207 return (SET_ERROR(ENOTSUP));
208 zn->zn_key_norm = zn->zn_normbuf;
209 zn->zn_key_norm_numints = strlen(zn->zn_key_norm) + 1;
210 } else {
211 if (mt != 0)
212 return (SET_ERROR(ENOTSUP));
213 zn->zn_key_norm = zn->zn_key_orig;
214 zn->zn_key_norm_numints = zn->zn_key_orig_numints;
215 }
216
217 zn->zn_hash = zap_hash(zn);
218
219 if (zap->zap_normflags != zn->zn_normflags) {
220 /*
221 * We *must* use zn_normflags because this normalization is
222 * what the matching is based on. (Not the hash!)
223 */
224 if (zap_normalize(zap, key, zn->zn_normbuf,
225 zn->zn_normflags) != 0)
226 return (SET_ERROR(ENOTSUP));
227 zn->zn_key_norm_numints = strlen(zn->zn_key_norm) + 1;
228 }
229
230 return (0);
231 }
232
233 zap_name_t *
zap_name_alloc_str(zap_t * zap,const char * key,matchtype_t mt)234 zap_name_alloc_str(zap_t *zap, const char *key, matchtype_t mt)
235 {
236 zap_name_t *zn = zap_name_alloc(zap);
237 if (zap_name_init_str(zn, key, mt) != 0) {
238 zap_name_free(zn);
239 return (NULL);
240 }
241 return (zn);
242 }
243
244 static zap_name_t *
zap_name_alloc_uint64(zap_t * zap,const uint64_t * key,int numints)245 zap_name_alloc_uint64(zap_t *zap, const uint64_t *key, int numints)
246 {
247 zap_name_t *zn = kmem_alloc(sizeof (zap_name_t), KM_SLEEP);
248
249 ASSERT(zap->zap_normflags == 0);
250 zn->zn_zap = zap;
251 zn->zn_key_intlen = sizeof (*key);
252 zn->zn_key_orig = zn->zn_key_norm = key;
253 zn->zn_key_orig_numints = zn->zn_key_norm_numints = numints;
254 zn->zn_matchtype = 0;
255
256 zn->zn_hash = zap_hash(zn);
257 return (zn);
258 }
259
260 static void
mzap_byteswap(mzap_phys_t * buf,size_t size)261 mzap_byteswap(mzap_phys_t *buf, size_t size)
262 {
263 buf->mz_block_type = BSWAP_64(buf->mz_block_type);
264 buf->mz_salt = BSWAP_64(buf->mz_salt);
265 buf->mz_normflags = BSWAP_64(buf->mz_normflags);
266 int max = (size / MZAP_ENT_LEN) - 1;
267 for (int i = 0; i < max; i++) {
268 buf->mz_chunk[i].mze_value =
269 BSWAP_64(buf->mz_chunk[i].mze_value);
270 buf->mz_chunk[i].mze_cd =
271 BSWAP_32(buf->mz_chunk[i].mze_cd);
272 }
273 }
274
275 void
zap_byteswap(void * buf,size_t size)276 zap_byteswap(void *buf, size_t size)
277 {
278 uint64_t block_type = *(uint64_t *)buf;
279
280 if (block_type == ZBT_MICRO || block_type == BSWAP_64(ZBT_MICRO)) {
281 /* ASSERT(magic == ZAP_LEAF_MAGIC); */
282 mzap_byteswap(buf, size);
283 } else {
284 fzap_byteswap(buf, size);
285 }
286 }
287
288 __attribute__((always_inline)) inline
289 static int
mze_compare(const void * arg1,const void * arg2)290 mze_compare(const void *arg1, const void *arg2)
291 {
292 const mzap_ent_t *mze1 = arg1;
293 const mzap_ent_t *mze2 = arg2;
294
295 return (TREE_CMP((uint64_t)(mze1->mze_hash) << 32 | mze1->mze_cd,
296 (uint64_t)(mze2->mze_hash) << 32 | mze2->mze_cd));
297 }
298
ZFS_BTREE_FIND_IN_BUF_FUNC(mze_find_in_buf,mzap_ent_t,mze_compare)299 ZFS_BTREE_FIND_IN_BUF_FUNC(mze_find_in_buf, mzap_ent_t,
300 mze_compare)
301
302 static void
303 mze_insert(zap_t *zap, uint16_t chunkid, uint64_t hash)
304 {
305 mzap_ent_t mze;
306
307 ASSERT(zap->zap_ismicro);
308 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
309
310 mze.mze_chunkid = chunkid;
311 ASSERT0(hash & 0xffffffff);
312 mze.mze_hash = hash >> 32;
313 ASSERT3U(MZE_PHYS(zap, &mze)->mze_cd, <=, 0xffff);
314 mze.mze_cd = (uint16_t)MZE_PHYS(zap, &mze)->mze_cd;
315 ASSERT(MZE_PHYS(zap, &mze)->mze_name[0] != 0);
316 zfs_btree_add(&zap->zap_m.zap_tree, &mze);
317 }
318
319 static mzap_ent_t *
mze_find(zap_name_t * zn,zfs_btree_index_t * idx)320 mze_find(zap_name_t *zn, zfs_btree_index_t *idx)
321 {
322 mzap_ent_t mze_tofind;
323 mzap_ent_t *mze;
324 zfs_btree_t *tree = &zn->zn_zap->zap_m.zap_tree;
325
326 ASSERT(zn->zn_zap->zap_ismicro);
327 ASSERT(RW_LOCK_HELD(&zn->zn_zap->zap_rwlock));
328
329 ASSERT0(zn->zn_hash & 0xffffffff);
330 mze_tofind.mze_hash = zn->zn_hash >> 32;
331 mze_tofind.mze_cd = 0;
332
333 mze = zfs_btree_find(tree, &mze_tofind, idx);
334 if (mze == NULL)
335 mze = zfs_btree_next(tree, idx, idx);
336 for (; mze && mze->mze_hash == mze_tofind.mze_hash;
337 mze = zfs_btree_next(tree, idx, idx)) {
338 ASSERT3U(mze->mze_cd, ==, MZE_PHYS(zn->zn_zap, mze)->mze_cd);
339 if (zap_match(zn, MZE_PHYS(zn->zn_zap, mze)->mze_name))
340 return (mze);
341 }
342
343 return (NULL);
344 }
345
346 static uint32_t
mze_find_unused_cd(zap_t * zap,uint64_t hash)347 mze_find_unused_cd(zap_t *zap, uint64_t hash)
348 {
349 mzap_ent_t mze_tofind;
350 zfs_btree_index_t idx;
351 zfs_btree_t *tree = &zap->zap_m.zap_tree;
352
353 ASSERT(zap->zap_ismicro);
354 ASSERT(RW_LOCK_HELD(&zap->zap_rwlock));
355
356 ASSERT0(hash & 0xffffffff);
357 hash >>= 32;
358 mze_tofind.mze_hash = hash;
359 mze_tofind.mze_cd = 0;
360
361 uint32_t cd = 0;
362 for (mzap_ent_t *mze = zfs_btree_find(tree, &mze_tofind, &idx);
363 mze && mze->mze_hash == hash;
364 mze = zfs_btree_next(tree, &idx, &idx)) {
365 if (mze->mze_cd != cd)
366 break;
367 cd++;
368 }
369
370 return (cd);
371 }
372
373 /*
374 * Each mzap entry requires at max : 4 chunks
375 * 3 chunks for names + 1 chunk for value.
376 */
377 #define MZAP_ENT_CHUNKS (1 + ZAP_LEAF_ARRAY_NCHUNKS(MZAP_NAME_LEN) + \
378 ZAP_LEAF_ARRAY_NCHUNKS(sizeof (uint64_t)))
379
380 /*
381 * Check if the current entry keeps the colliding entries under the fatzap leaf
382 * size.
383 */
384 static boolean_t
mze_canfit_fzap_leaf(zap_name_t * zn,uint64_t hash)385 mze_canfit_fzap_leaf(zap_name_t *zn, uint64_t hash)
386 {
387 zap_t *zap = zn->zn_zap;
388 mzap_ent_t mze_tofind;
389 zfs_btree_index_t idx;
390 zfs_btree_t *tree = &zap->zap_m.zap_tree;
391 uint32_t mzap_ents = 0;
392
393 ASSERT0(hash & 0xffffffff);
394 hash >>= 32;
395 mze_tofind.mze_hash = hash;
396 mze_tofind.mze_cd = 0;
397
398 for (mzap_ent_t *mze = zfs_btree_find(tree, &mze_tofind, &idx);
399 mze && mze->mze_hash == hash;
400 mze = zfs_btree_next(tree, &idx, &idx)) {
401 mzap_ents++;
402 }
403
404 /* Include the new entry being added */
405 mzap_ents++;
406
407 return (ZAP_LEAF_NUMCHUNKS_DEF > (mzap_ents * MZAP_ENT_CHUNKS));
408 }
409
410 static void
mze_destroy(zap_t * zap)411 mze_destroy(zap_t *zap)
412 {
413 zfs_btree_clear(&zap->zap_m.zap_tree);
414 zfs_btree_destroy(&zap->zap_m.zap_tree);
415 }
416
417 static zap_t *
mzap_open(dmu_buf_t * db)418 mzap_open(dmu_buf_t *db)
419 {
420 zap_t *winner;
421 uint64_t *zap_hdr = (uint64_t *)db->db_data;
422 uint64_t zap_block_type = zap_hdr[0];
423 uint64_t zap_magic = zap_hdr[1];
424
425 ASSERT3U(MZAP_ENT_LEN, ==, sizeof (mzap_ent_phys_t));
426
427 zap_t *zap = kmem_zalloc(sizeof (zap_t), KM_SLEEP);
428 rw_init(&zap->zap_rwlock, NULL, RW_DEFAULT, NULL);
429 rw_enter(&zap->zap_rwlock, RW_WRITER);
430 zap->zap_objset = dmu_buf_get_objset(db);
431 zap->zap_object = db->db_object;
432 zap->zap_dbuf = db;
433
434 if (zap_block_type != ZBT_MICRO) {
435 mutex_init(&zap->zap_f.zap_num_entries_mtx, 0, MUTEX_DEFAULT,
436 0);
437 zap->zap_f.zap_block_shift = highbit64(db->db_size) - 1;
438 if (zap_block_type != ZBT_HEADER || zap_magic != ZAP_MAGIC) {
439 winner = NULL; /* No actual winner here... */
440 goto handle_winner;
441 }
442 } else {
443 zap->zap_ismicro = TRUE;
444 }
445
446 /*
447 * Make sure that zap_ismicro is set before we let others see
448 * it, because zap_lockdir() checks zap_ismicro without the lock
449 * held.
450 */
451 dmu_buf_init_user(&zap->zap_dbu, zap_evict_sync, NULL, &zap->zap_dbuf);
452 winner = dmu_buf_set_user(db, &zap->zap_dbu);
453
454 if (winner != NULL)
455 goto handle_winner;
456
457 if (zap->zap_ismicro) {
458 zap->zap_salt = zap_m_phys(zap)->mz_salt;
459 zap->zap_normflags = zap_m_phys(zap)->mz_normflags;
460 zap->zap_m.zap_num_chunks = db->db_size / MZAP_ENT_LEN - 1;
461
462 /*
463 * Reduce B-tree leaf from 4KB to 512 bytes to reduce memmove()
464 * overhead on massive inserts below. It still allows to store
465 * 62 entries before we have to add 2KB B-tree core node.
466 */
467 zfs_btree_create_custom(&zap->zap_m.zap_tree, mze_compare,
468 mze_find_in_buf, sizeof (mzap_ent_t), 512);
469
470 zap_name_t *zn = zap_name_alloc(zap);
471 for (uint16_t i = 0; i < zap->zap_m.zap_num_chunks; i++) {
472 mzap_ent_phys_t *mze =
473 &zap_m_phys(zap)->mz_chunk[i];
474 if (mze->mze_name[0]) {
475 zap->zap_m.zap_num_entries++;
476 zap_name_init_str(zn, mze->mze_name, 0);
477 mze_insert(zap, i, zn->zn_hash);
478 }
479 }
480 zap_name_free(zn);
481 } else {
482 zap->zap_salt = zap_f_phys(zap)->zap_salt;
483 zap->zap_normflags = zap_f_phys(zap)->zap_normflags;
484
485 ASSERT3U(sizeof (struct zap_leaf_header), ==,
486 2*ZAP_LEAF_CHUNKSIZE);
487
488 /*
489 * The embedded pointer table should not overlap the
490 * other members.
491 */
492 ASSERT3P(&ZAP_EMBEDDED_PTRTBL_ENT(zap, 0), >,
493 &zap_f_phys(zap)->zap_salt);
494
495 /*
496 * The embedded pointer table should end at the end of
497 * the block
498 */
499 ASSERT3U((uintptr_t)&ZAP_EMBEDDED_PTRTBL_ENT(zap,
500 1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap)) -
501 (uintptr_t)zap_f_phys(zap), ==,
502 zap->zap_dbuf->db_size);
503 }
504 rw_exit(&zap->zap_rwlock);
505 return (zap);
506
507 handle_winner:
508 rw_exit(&zap->zap_rwlock);
509 rw_destroy(&zap->zap_rwlock);
510 if (!zap->zap_ismicro)
511 mutex_destroy(&zap->zap_f.zap_num_entries_mtx);
512 kmem_free(zap, sizeof (zap_t));
513 return (winner);
514 }
515
516 /*
517 * This routine "consumes" the caller's hold on the dbuf, which must
518 * have the specified tag.
519 */
520 static int
zap_lockdir_impl(dnode_t * dn,dmu_buf_t * db,const void * tag,dmu_tx_t * tx,krw_t lti,boolean_t fatreader,boolean_t adding,zap_t ** zapp)521 zap_lockdir_impl(dnode_t *dn, dmu_buf_t *db, const void *tag, dmu_tx_t *tx,
522 krw_t lti, boolean_t fatreader, boolean_t adding, zap_t **zapp)
523 {
524 ASSERT0(db->db_offset);
525 objset_t *os = dmu_buf_get_objset(db);
526 uint64_t obj = db->db_object;
527 dmu_object_info_t doi;
528
529 *zapp = NULL;
530
531 dmu_object_info_from_dnode(dn, &doi);
532 if (DMU_OT_BYTESWAP(doi.doi_type) != DMU_BSWAP_ZAP)
533 return (SET_ERROR(EINVAL));
534
535 zap_t *zap = dmu_buf_get_user(db);
536 if (zap == NULL) {
537 zap = mzap_open(db);
538 if (zap == NULL) {
539 /*
540 * mzap_open() didn't like what it saw on-disk.
541 * Check for corruption!
542 */
543 return (SET_ERROR(EIO));
544 }
545 }
546
547 /*
548 * We're checking zap_ismicro without the lock held, in order to
549 * tell what type of lock we want. Once we have some sort of
550 * lock, see if it really is the right type. In practice this
551 * can only be different if it was upgraded from micro to fat,
552 * and micro wanted WRITER but fat only needs READER.
553 */
554 krw_t lt = (!zap->zap_ismicro && fatreader) ? RW_READER : lti;
555 rw_enter(&zap->zap_rwlock, lt);
556 if (lt != ((!zap->zap_ismicro && fatreader) ? RW_READER : lti)) {
557 /* it was upgraded, now we only need reader */
558 ASSERT(lt == RW_WRITER);
559 ASSERT(RW_READER ==
560 ((!zap->zap_ismicro && fatreader) ? RW_READER : lti));
561 rw_downgrade(&zap->zap_rwlock);
562 lt = RW_READER;
563 }
564
565 zap->zap_objset = os;
566 zap->zap_dnode = dn;
567
568 if (lt == RW_WRITER)
569 dmu_buf_will_dirty(db, tx);
570
571 ASSERT3P(zap->zap_dbuf, ==, db);
572
573 ASSERT(!zap->zap_ismicro ||
574 zap->zap_m.zap_num_entries <= zap->zap_m.zap_num_chunks);
575 if (zap->zap_ismicro && tx && adding &&
576 zap->zap_m.zap_num_entries == zap->zap_m.zap_num_chunks) {
577 uint64_t newsz = db->db_size + SPA_MINBLOCKSIZE;
578 if (newsz > zap_micro_max_size) {
579 dprintf("upgrading obj %llu: num_entries=%u\n",
580 (u_longlong_t)obj, zap->zap_m.zap_num_entries);
581 *zapp = zap;
582 int err = mzap_upgrade(zapp, tag, tx, 0);
583 if (err != 0)
584 rw_exit(&zap->zap_rwlock);
585 return (err);
586 }
587 VERIFY0(dmu_object_set_blocksize(os, obj, newsz, 0, tx));
588 zap->zap_m.zap_num_chunks =
589 db->db_size / MZAP_ENT_LEN - 1;
590 }
591
592 *zapp = zap;
593 return (0);
594 }
595
596 static int
zap_lockdir_by_dnode(dnode_t * dn,dmu_tx_t * tx,krw_t lti,boolean_t fatreader,boolean_t adding,const void * tag,zap_t ** zapp)597 zap_lockdir_by_dnode(dnode_t *dn, dmu_tx_t *tx,
598 krw_t lti, boolean_t fatreader, boolean_t adding, const void *tag,
599 zap_t **zapp)
600 {
601 dmu_buf_t *db;
602 int err;
603
604 err = dmu_buf_hold_by_dnode(dn, 0, tag, &db, DMU_READ_NO_PREFETCH);
605 if (err != 0)
606 return (err);
607 err = zap_lockdir_impl(dn, db, tag, tx, lti, fatreader, adding, zapp);
608 if (err != 0)
609 dmu_buf_rele(db, tag);
610 else
611 VERIFY(dnode_add_ref(dn, tag));
612 return (err);
613 }
614
615 int
zap_lockdir(objset_t * os,uint64_t obj,dmu_tx_t * tx,krw_t lti,boolean_t fatreader,boolean_t adding,const void * tag,zap_t ** zapp)616 zap_lockdir(objset_t *os, uint64_t obj, dmu_tx_t *tx,
617 krw_t lti, boolean_t fatreader, boolean_t adding, const void *tag,
618 zap_t **zapp)
619 {
620 dnode_t *dn;
621 dmu_buf_t *db;
622 int err;
623
624 err = dnode_hold(os, obj, tag, &dn);
625 if (err != 0)
626 return (err);
627 err = dmu_buf_hold_by_dnode(dn, 0, tag, &db, DMU_READ_NO_PREFETCH);
628 if (err != 0) {
629 dnode_rele(dn, tag);
630 return (err);
631 }
632 err = zap_lockdir_impl(dn, db, tag, tx, lti, fatreader, adding, zapp);
633 if (err != 0) {
634 dmu_buf_rele(db, tag);
635 dnode_rele(dn, tag);
636 }
637 return (err);
638 }
639
640 void
zap_unlockdir(zap_t * zap,const void * tag)641 zap_unlockdir(zap_t *zap, const void *tag)
642 {
643 rw_exit(&zap->zap_rwlock);
644 dnode_rele(zap->zap_dnode, tag);
645 dmu_buf_rele(zap->zap_dbuf, tag);
646 }
647
648 static int
mzap_upgrade(zap_t ** zapp,const void * tag,dmu_tx_t * tx,zap_flags_t flags)649 mzap_upgrade(zap_t **zapp, const void *tag, dmu_tx_t *tx, zap_flags_t flags)
650 {
651 int err = 0;
652 zap_t *zap = *zapp;
653
654 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
655
656 int sz = zap->zap_dbuf->db_size;
657 mzap_phys_t *mzp = vmem_alloc(sz, KM_SLEEP);
658 memcpy(mzp, zap->zap_dbuf->db_data, sz);
659 int nchunks = zap->zap_m.zap_num_chunks;
660
661 if (!flags) {
662 err = dmu_object_set_blocksize(zap->zap_objset, zap->zap_object,
663 1ULL << fzap_default_block_shift, 0, tx);
664 if (err != 0) {
665 vmem_free(mzp, sz);
666 return (err);
667 }
668 }
669
670 dprintf("upgrading obj=%llu with %u chunks\n",
671 (u_longlong_t)zap->zap_object, nchunks);
672 /* XXX destroy the tree later, so we can use the stored hash value */
673 mze_destroy(zap);
674
675 fzap_upgrade(zap, tx, flags);
676
677 zap_name_t *zn = zap_name_alloc(zap);
678 for (int i = 0; i < nchunks; i++) {
679 mzap_ent_phys_t *mze = &mzp->mz_chunk[i];
680 if (mze->mze_name[0] == 0)
681 continue;
682 dprintf("adding %s=%llu\n",
683 mze->mze_name, (u_longlong_t)mze->mze_value);
684 zap_name_init_str(zn, mze->mze_name, 0);
685 /* If we fail here, we would end up losing entries */
686 VERIFY0(fzap_add_cd(zn, 8, 1, &mze->mze_value, mze->mze_cd,
687 tag, tx));
688 zap = zn->zn_zap; /* fzap_add_cd() may change zap */
689 }
690 zap_name_free(zn);
691 vmem_free(mzp, sz);
692 *zapp = zap;
693 return (0);
694 }
695
696 /*
697 * The "normflags" determine the behavior of the matchtype_t which is
698 * passed to zap_lookup_norm(). Names which have the same normalized
699 * version will be stored with the same hash value, and therefore we can
700 * perform normalization-insensitive lookups. We can be Unicode form-
701 * insensitive and/or case-insensitive. The following flags are valid for
702 * "normflags":
703 *
704 * U8_TEXTPREP_NFC
705 * U8_TEXTPREP_NFD
706 * U8_TEXTPREP_NFKC
707 * U8_TEXTPREP_NFKD
708 * U8_TEXTPREP_TOUPPER
709 *
710 * The *_NF* (Normalization Form) flags are mutually exclusive; at most one
711 * of them may be supplied.
712 */
713 void
mzap_create_impl(dnode_t * dn,int normflags,zap_flags_t flags,dmu_tx_t * tx)714 mzap_create_impl(dnode_t *dn, int normflags, zap_flags_t flags, dmu_tx_t *tx)
715 {
716 dmu_buf_t *db;
717
718 VERIFY0(dmu_buf_hold_by_dnode(dn, 0, FTAG, &db, DMU_READ_NO_PREFETCH));
719
720 dmu_buf_will_dirty(db, tx);
721 mzap_phys_t *zp = db->db_data;
722 zp->mz_block_type = ZBT_MICRO;
723 zp->mz_salt =
724 ((uintptr_t)db ^ (uintptr_t)tx ^ (dn->dn_object << 1)) | 1ULL;
725 zp->mz_normflags = normflags;
726
727 if (flags != 0) {
728 zap_t *zap;
729 /* Only fat zap supports flags; upgrade immediately. */
730 VERIFY(dnode_add_ref(dn, FTAG));
731 VERIFY0(zap_lockdir_impl(dn, db, FTAG, tx, RW_WRITER,
732 B_FALSE, B_FALSE, &zap));
733 VERIFY0(mzap_upgrade(&zap, FTAG, tx, flags));
734 zap_unlockdir(zap, FTAG);
735 } else {
736 dmu_buf_rele(db, FTAG);
737 }
738 }
739
740 static uint64_t
zap_create_impl(objset_t * os,int normflags,zap_flags_t flags,dmu_object_type_t ot,int leaf_blockshift,int indirect_blockshift,dmu_object_type_t bonustype,int bonuslen,int dnodesize,dnode_t ** allocated_dnode,const void * tag,dmu_tx_t * tx)741 zap_create_impl(objset_t *os, int normflags, zap_flags_t flags,
742 dmu_object_type_t ot, int leaf_blockshift, int indirect_blockshift,
743 dmu_object_type_t bonustype, int bonuslen, int dnodesize,
744 dnode_t **allocated_dnode, const void *tag, dmu_tx_t *tx)
745 {
746 uint64_t obj;
747
748 ASSERT3U(DMU_OT_BYTESWAP(ot), ==, DMU_BSWAP_ZAP);
749
750 if (allocated_dnode == NULL) {
751 dnode_t *dn;
752 obj = dmu_object_alloc_hold(os, ot, 1ULL << leaf_blockshift,
753 indirect_blockshift, bonustype, bonuslen, dnodesize,
754 &dn, FTAG, tx);
755 mzap_create_impl(dn, normflags, flags, tx);
756 dnode_rele(dn, FTAG);
757 } else {
758 obj = dmu_object_alloc_hold(os, ot, 1ULL << leaf_blockshift,
759 indirect_blockshift, bonustype, bonuslen, dnodesize,
760 allocated_dnode, tag, tx);
761 mzap_create_impl(*allocated_dnode, normflags, flags, tx);
762 }
763
764 return (obj);
765 }
766
767 int
zap_create_claim(objset_t * os,uint64_t obj,dmu_object_type_t ot,dmu_object_type_t bonustype,int bonuslen,dmu_tx_t * tx)768 zap_create_claim(objset_t *os, uint64_t obj, dmu_object_type_t ot,
769 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
770 {
771 return (zap_create_claim_dnsize(os, obj, ot, bonustype, bonuslen,
772 0, tx));
773 }
774
775 int
zap_create_claim_dnsize(objset_t * os,uint64_t obj,dmu_object_type_t ot,dmu_object_type_t bonustype,int bonuslen,int dnodesize,dmu_tx_t * tx)776 zap_create_claim_dnsize(objset_t *os, uint64_t obj, dmu_object_type_t ot,
777 dmu_object_type_t bonustype, int bonuslen, int dnodesize, dmu_tx_t *tx)
778 {
779 return (zap_create_claim_norm_dnsize(os, obj,
780 0, ot, bonustype, bonuslen, dnodesize, tx));
781 }
782
783 int
zap_create_claim_norm(objset_t * os,uint64_t obj,int normflags,dmu_object_type_t ot,dmu_object_type_t bonustype,int bonuslen,dmu_tx_t * tx)784 zap_create_claim_norm(objset_t *os, uint64_t obj, int normflags,
785 dmu_object_type_t ot,
786 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
787 {
788 return (zap_create_claim_norm_dnsize(os, obj, normflags, ot, bonustype,
789 bonuslen, 0, tx));
790 }
791
792 int
zap_create_claim_norm_dnsize(objset_t * os,uint64_t obj,int normflags,dmu_object_type_t ot,dmu_object_type_t bonustype,int bonuslen,int dnodesize,dmu_tx_t * tx)793 zap_create_claim_norm_dnsize(objset_t *os, uint64_t obj, int normflags,
794 dmu_object_type_t ot, dmu_object_type_t bonustype, int bonuslen,
795 int dnodesize, dmu_tx_t *tx)
796 {
797 dnode_t *dn;
798 int error;
799
800 ASSERT3U(DMU_OT_BYTESWAP(ot), ==, DMU_BSWAP_ZAP);
801 error = dmu_object_claim_dnsize(os, obj, ot, 0, bonustype, bonuslen,
802 dnodesize, tx);
803 if (error != 0)
804 return (error);
805
806 error = dnode_hold(os, obj, FTAG, &dn);
807 if (error != 0)
808 return (error);
809
810 mzap_create_impl(dn, normflags, 0, tx);
811
812 dnode_rele(dn, FTAG);
813
814 return (0);
815 }
816
817 uint64_t
zap_create(objset_t * os,dmu_object_type_t ot,dmu_object_type_t bonustype,int bonuslen,dmu_tx_t * tx)818 zap_create(objset_t *os, dmu_object_type_t ot,
819 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
820 {
821 return (zap_create_norm(os, 0, ot, bonustype, bonuslen, tx));
822 }
823
824 uint64_t
zap_create_dnsize(objset_t * os,dmu_object_type_t ot,dmu_object_type_t bonustype,int bonuslen,int dnodesize,dmu_tx_t * tx)825 zap_create_dnsize(objset_t *os, dmu_object_type_t ot,
826 dmu_object_type_t bonustype, int bonuslen, int dnodesize, dmu_tx_t *tx)
827 {
828 return (zap_create_norm_dnsize(os, 0, ot, bonustype, bonuslen,
829 dnodesize, tx));
830 }
831
832 uint64_t
zap_create_norm(objset_t * os,int normflags,dmu_object_type_t ot,dmu_object_type_t bonustype,int bonuslen,dmu_tx_t * tx)833 zap_create_norm(objset_t *os, int normflags, dmu_object_type_t ot,
834 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
835 {
836 return (zap_create_norm_dnsize(os, normflags, ot, bonustype, bonuslen,
837 0, tx));
838 }
839
840 uint64_t
zap_create_norm_dnsize(objset_t * os,int normflags,dmu_object_type_t ot,dmu_object_type_t bonustype,int bonuslen,int dnodesize,dmu_tx_t * tx)841 zap_create_norm_dnsize(objset_t *os, int normflags, dmu_object_type_t ot,
842 dmu_object_type_t bonustype, int bonuslen, int dnodesize, dmu_tx_t *tx)
843 {
844 return (zap_create_impl(os, normflags, 0, ot, 0, 0,
845 bonustype, bonuslen, dnodesize, NULL, NULL, tx));
846 }
847
848 uint64_t
zap_create_flags(objset_t * os,int normflags,zap_flags_t flags,dmu_object_type_t ot,int leaf_blockshift,int indirect_blockshift,dmu_object_type_t bonustype,int bonuslen,dmu_tx_t * tx)849 zap_create_flags(objset_t *os, int normflags, zap_flags_t flags,
850 dmu_object_type_t ot, int leaf_blockshift, int indirect_blockshift,
851 dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx)
852 {
853 return (zap_create_flags_dnsize(os, normflags, flags, ot,
854 leaf_blockshift, indirect_blockshift, bonustype, bonuslen, 0, tx));
855 }
856
857 uint64_t
zap_create_flags_dnsize(objset_t * os,int normflags,zap_flags_t flags,dmu_object_type_t ot,int leaf_blockshift,int indirect_blockshift,dmu_object_type_t bonustype,int bonuslen,int dnodesize,dmu_tx_t * tx)858 zap_create_flags_dnsize(objset_t *os, int normflags, zap_flags_t flags,
859 dmu_object_type_t ot, int leaf_blockshift, int indirect_blockshift,
860 dmu_object_type_t bonustype, int bonuslen, int dnodesize, dmu_tx_t *tx)
861 {
862 return (zap_create_impl(os, normflags, flags, ot, leaf_blockshift,
863 indirect_blockshift, bonustype, bonuslen, dnodesize, NULL, NULL,
864 tx));
865 }
866
867 /*
868 * Create a zap object and return a pointer to the newly allocated dnode via
869 * the allocated_dnode argument. The returned dnode will be held and the
870 * caller is responsible for releasing the hold by calling dnode_rele().
871 */
872 uint64_t
zap_create_hold(objset_t * os,int normflags,zap_flags_t flags,dmu_object_type_t ot,int leaf_blockshift,int indirect_blockshift,dmu_object_type_t bonustype,int bonuslen,int dnodesize,dnode_t ** allocated_dnode,const void * tag,dmu_tx_t * tx)873 zap_create_hold(objset_t *os, int normflags, zap_flags_t flags,
874 dmu_object_type_t ot, int leaf_blockshift, int indirect_blockshift,
875 dmu_object_type_t bonustype, int bonuslen, int dnodesize,
876 dnode_t **allocated_dnode, const void *tag, dmu_tx_t *tx)
877 {
878 return (zap_create_impl(os, normflags, flags, ot, leaf_blockshift,
879 indirect_blockshift, bonustype, bonuslen, dnodesize,
880 allocated_dnode, tag, tx));
881 }
882
883 int
zap_destroy(objset_t * os,uint64_t zapobj,dmu_tx_t * tx)884 zap_destroy(objset_t *os, uint64_t zapobj, dmu_tx_t *tx)
885 {
886 /*
887 * dmu_object_free will free the object number and free the
888 * data. Freeing the data will cause our pageout function to be
889 * called, which will destroy our data (zap_leaf_t's and zap_t).
890 */
891
892 return (dmu_object_free(os, zapobj, tx));
893 }
894
895 void
zap_evict_sync(void * dbu)896 zap_evict_sync(void *dbu)
897 {
898 zap_t *zap = dbu;
899
900 rw_destroy(&zap->zap_rwlock);
901
902 if (zap->zap_ismicro)
903 mze_destroy(zap);
904 else
905 mutex_destroy(&zap->zap_f.zap_num_entries_mtx);
906
907 kmem_free(zap, sizeof (zap_t));
908 }
909
910 int
zap_count(objset_t * os,uint64_t zapobj,uint64_t * count)911 zap_count(objset_t *os, uint64_t zapobj, uint64_t *count)
912 {
913 zap_t *zap;
914
915 int err =
916 zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap);
917 if (err != 0)
918 return (err);
919 if (!zap->zap_ismicro) {
920 err = fzap_count(zap, count);
921 } else {
922 *count = zap->zap_m.zap_num_entries;
923 }
924 zap_unlockdir(zap, FTAG);
925 return (err);
926 }
927
928 /*
929 * zn may be NULL; if not specified, it will be computed if needed.
930 * See also the comment above zap_entry_normalization_conflict().
931 */
932 static boolean_t
mzap_normalization_conflict(zap_t * zap,zap_name_t * zn,mzap_ent_t * mze,zfs_btree_index_t * idx)933 mzap_normalization_conflict(zap_t *zap, zap_name_t *zn, mzap_ent_t *mze,
934 zfs_btree_index_t *idx)
935 {
936 boolean_t allocdzn = B_FALSE;
937 mzap_ent_t *other;
938 zfs_btree_index_t oidx;
939
940 if (zap->zap_normflags == 0)
941 return (B_FALSE);
942
943 for (other = zfs_btree_prev(&zap->zap_m.zap_tree, idx, &oidx);
944 other && other->mze_hash == mze->mze_hash;
945 other = zfs_btree_prev(&zap->zap_m.zap_tree, &oidx, &oidx)) {
946
947 if (zn == NULL) {
948 zn = zap_name_alloc_str(zap,
949 MZE_PHYS(zap, mze)->mze_name, MT_NORMALIZE);
950 allocdzn = B_TRUE;
951 }
952 if (zap_match(zn, MZE_PHYS(zap, other)->mze_name)) {
953 if (allocdzn)
954 zap_name_free(zn);
955 return (B_TRUE);
956 }
957 }
958
959 for (other = zfs_btree_next(&zap->zap_m.zap_tree, idx, &oidx);
960 other && other->mze_hash == mze->mze_hash;
961 other = zfs_btree_next(&zap->zap_m.zap_tree, &oidx, &oidx)) {
962
963 if (zn == NULL) {
964 zn = zap_name_alloc_str(zap,
965 MZE_PHYS(zap, mze)->mze_name, MT_NORMALIZE);
966 allocdzn = B_TRUE;
967 }
968 if (zap_match(zn, MZE_PHYS(zap, other)->mze_name)) {
969 if (allocdzn)
970 zap_name_free(zn);
971 return (B_TRUE);
972 }
973 }
974
975 if (allocdzn)
976 zap_name_free(zn);
977 return (B_FALSE);
978 }
979
980 /*
981 * Routines for manipulating attributes.
982 */
983
984 int
zap_lookup(objset_t * os,uint64_t zapobj,const char * name,uint64_t integer_size,uint64_t num_integers,void * buf)985 zap_lookup(objset_t *os, uint64_t zapobj, const char *name,
986 uint64_t integer_size, uint64_t num_integers, void *buf)
987 {
988 return (zap_lookup_norm(os, zapobj, name, integer_size,
989 num_integers, buf, 0, NULL, 0, NULL));
990 }
991
992 static int
zap_lookup_impl(zap_t * zap,const char * name,uint64_t integer_size,uint64_t num_integers,void * buf,matchtype_t mt,char * realname,int rn_len,boolean_t * ncp)993 zap_lookup_impl(zap_t *zap, const char *name,
994 uint64_t integer_size, uint64_t num_integers, void *buf,
995 matchtype_t mt, char *realname, int rn_len,
996 boolean_t *ncp)
997 {
998 int err = 0;
999
1000 zap_name_t *zn = zap_name_alloc_str(zap, name, mt);
1001 if (zn == NULL)
1002 return (SET_ERROR(ENOTSUP));
1003
1004 if (!zap->zap_ismicro) {
1005 err = fzap_lookup(zn, integer_size, num_integers, buf,
1006 realname, rn_len, ncp);
1007 } else {
1008 zfs_btree_index_t idx;
1009 mzap_ent_t *mze = mze_find(zn, &idx);
1010 if (mze == NULL) {
1011 err = SET_ERROR(ENOENT);
1012 } else {
1013 if (num_integers < 1) {
1014 err = SET_ERROR(EOVERFLOW);
1015 } else if (integer_size != 8) {
1016 err = SET_ERROR(EINVAL);
1017 } else {
1018 *(uint64_t *)buf =
1019 MZE_PHYS(zap, mze)->mze_value;
1020 if (realname != NULL)
1021 (void) strlcpy(realname,
1022 MZE_PHYS(zap, mze)->mze_name,
1023 rn_len);
1024 if (ncp) {
1025 *ncp = mzap_normalization_conflict(zap,
1026 zn, mze, &idx);
1027 }
1028 }
1029 }
1030 }
1031 zap_name_free(zn);
1032 return (err);
1033 }
1034
1035 int
zap_lookup_norm(objset_t * os,uint64_t zapobj,const char * name,uint64_t integer_size,uint64_t num_integers,void * buf,matchtype_t mt,char * realname,int rn_len,boolean_t * ncp)1036 zap_lookup_norm(objset_t *os, uint64_t zapobj, const char *name,
1037 uint64_t integer_size, uint64_t num_integers, void *buf,
1038 matchtype_t mt, char *realname, int rn_len,
1039 boolean_t *ncp)
1040 {
1041 zap_t *zap;
1042
1043 int err =
1044 zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap);
1045 if (err != 0)
1046 return (err);
1047 err = zap_lookup_impl(zap, name, integer_size,
1048 num_integers, buf, mt, realname, rn_len, ncp);
1049 zap_unlockdir(zap, FTAG);
1050 return (err);
1051 }
1052
1053 int
zap_prefetch(objset_t * os,uint64_t zapobj,const char * name)1054 zap_prefetch(objset_t *os, uint64_t zapobj, const char *name)
1055 {
1056 zap_t *zap;
1057 int err;
1058 zap_name_t *zn;
1059
1060 err = zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap);
1061 if (err)
1062 return (err);
1063 zn = zap_name_alloc_str(zap, name, 0);
1064 if (zn == NULL) {
1065 zap_unlockdir(zap, FTAG);
1066 return (SET_ERROR(ENOTSUP));
1067 }
1068
1069 fzap_prefetch(zn);
1070 zap_name_free(zn);
1071 zap_unlockdir(zap, FTAG);
1072 return (err);
1073 }
1074
1075 int
zap_lookup_by_dnode(dnode_t * dn,const char * name,uint64_t integer_size,uint64_t num_integers,void * buf)1076 zap_lookup_by_dnode(dnode_t *dn, const char *name,
1077 uint64_t integer_size, uint64_t num_integers, void *buf)
1078 {
1079 return (zap_lookup_norm_by_dnode(dn, name, integer_size,
1080 num_integers, buf, 0, NULL, 0, NULL));
1081 }
1082
1083 int
zap_lookup_norm_by_dnode(dnode_t * dn,const char * name,uint64_t integer_size,uint64_t num_integers,void * buf,matchtype_t mt,char * realname,int rn_len,boolean_t * ncp)1084 zap_lookup_norm_by_dnode(dnode_t *dn, const char *name,
1085 uint64_t integer_size, uint64_t num_integers, void *buf,
1086 matchtype_t mt, char *realname, int rn_len,
1087 boolean_t *ncp)
1088 {
1089 zap_t *zap;
1090
1091 int err = zap_lockdir_by_dnode(dn, NULL, RW_READER, TRUE, FALSE,
1092 FTAG, &zap);
1093 if (err != 0)
1094 return (err);
1095 err = zap_lookup_impl(zap, name, integer_size,
1096 num_integers, buf, mt, realname, rn_len, ncp);
1097 zap_unlockdir(zap, FTAG);
1098 return (err);
1099 }
1100
1101 int
zap_prefetch_uint64(objset_t * os,uint64_t zapobj,const uint64_t * key,int key_numints)1102 zap_prefetch_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key,
1103 int key_numints)
1104 {
1105 zap_t *zap;
1106
1107 int err =
1108 zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap);
1109 if (err != 0)
1110 return (err);
1111 zap_name_t *zn = zap_name_alloc_uint64(zap, key, key_numints);
1112 if (zn == NULL) {
1113 zap_unlockdir(zap, FTAG);
1114 return (SET_ERROR(ENOTSUP));
1115 }
1116
1117 fzap_prefetch(zn);
1118 zap_name_free(zn);
1119 zap_unlockdir(zap, FTAG);
1120 return (err);
1121 }
1122
1123 int
zap_lookup_uint64(objset_t * os,uint64_t zapobj,const uint64_t * key,int key_numints,uint64_t integer_size,uint64_t num_integers,void * buf)1124 zap_lookup_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key,
1125 int key_numints, uint64_t integer_size, uint64_t num_integers, void *buf)
1126 {
1127 zap_t *zap;
1128
1129 int err =
1130 zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap);
1131 if (err != 0)
1132 return (err);
1133 zap_name_t *zn = zap_name_alloc_uint64(zap, key, key_numints);
1134 if (zn == NULL) {
1135 zap_unlockdir(zap, FTAG);
1136 return (SET_ERROR(ENOTSUP));
1137 }
1138
1139 err = fzap_lookup(zn, integer_size, num_integers, buf,
1140 NULL, 0, NULL);
1141 zap_name_free(zn);
1142 zap_unlockdir(zap, FTAG);
1143 return (err);
1144 }
1145
1146 int
zap_contains(objset_t * os,uint64_t zapobj,const char * name)1147 zap_contains(objset_t *os, uint64_t zapobj, const char *name)
1148 {
1149 int err = zap_lookup_norm(os, zapobj, name, 0,
1150 0, NULL, 0, NULL, 0, NULL);
1151 if (err == EOVERFLOW || err == EINVAL)
1152 err = 0; /* found, but skipped reading the value */
1153 return (err);
1154 }
1155
1156 int
zap_length(objset_t * os,uint64_t zapobj,const char * name,uint64_t * integer_size,uint64_t * num_integers)1157 zap_length(objset_t *os, uint64_t zapobj, const char *name,
1158 uint64_t *integer_size, uint64_t *num_integers)
1159 {
1160 zap_t *zap;
1161
1162 int err =
1163 zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap);
1164 if (err != 0)
1165 return (err);
1166 zap_name_t *zn = zap_name_alloc_str(zap, name, 0);
1167 if (zn == NULL) {
1168 zap_unlockdir(zap, FTAG);
1169 return (SET_ERROR(ENOTSUP));
1170 }
1171 if (!zap->zap_ismicro) {
1172 err = fzap_length(zn, integer_size, num_integers);
1173 } else {
1174 zfs_btree_index_t idx;
1175 mzap_ent_t *mze = mze_find(zn, &idx);
1176 if (mze == NULL) {
1177 err = SET_ERROR(ENOENT);
1178 } else {
1179 if (integer_size)
1180 *integer_size = 8;
1181 if (num_integers)
1182 *num_integers = 1;
1183 }
1184 }
1185 zap_name_free(zn);
1186 zap_unlockdir(zap, FTAG);
1187 return (err);
1188 }
1189
1190 int
zap_length_uint64(objset_t * os,uint64_t zapobj,const uint64_t * key,int key_numints,uint64_t * integer_size,uint64_t * num_integers)1191 zap_length_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key,
1192 int key_numints, uint64_t *integer_size, uint64_t *num_integers)
1193 {
1194 zap_t *zap;
1195
1196 int err =
1197 zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap);
1198 if (err != 0)
1199 return (err);
1200 zap_name_t *zn = zap_name_alloc_uint64(zap, key, key_numints);
1201 if (zn == NULL) {
1202 zap_unlockdir(zap, FTAG);
1203 return (SET_ERROR(ENOTSUP));
1204 }
1205 err = fzap_length(zn, integer_size, num_integers);
1206 zap_name_free(zn);
1207 zap_unlockdir(zap, FTAG);
1208 return (err);
1209 }
1210
1211 static void
mzap_addent(zap_name_t * zn,uint64_t value)1212 mzap_addent(zap_name_t *zn, uint64_t value)
1213 {
1214 zap_t *zap = zn->zn_zap;
1215 uint16_t start = zap->zap_m.zap_alloc_next;
1216
1217 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
1218
1219 #ifdef ZFS_DEBUG
1220 for (int i = 0; i < zap->zap_m.zap_num_chunks; i++) {
1221 mzap_ent_phys_t *mze = &zap_m_phys(zap)->mz_chunk[i];
1222 ASSERT(strcmp(zn->zn_key_orig, mze->mze_name) != 0);
1223 }
1224 #endif
1225
1226 uint32_t cd = mze_find_unused_cd(zap, zn->zn_hash);
1227 /* given the limited size of the microzap, this can't happen */
1228 ASSERT(cd < zap_maxcd(zap));
1229
1230 again:
1231 for (uint16_t i = start; i < zap->zap_m.zap_num_chunks; i++) {
1232 mzap_ent_phys_t *mze = &zap_m_phys(zap)->mz_chunk[i];
1233 if (mze->mze_name[0] == 0) {
1234 mze->mze_value = value;
1235 mze->mze_cd = cd;
1236 (void) strlcpy(mze->mze_name, zn->zn_key_orig,
1237 sizeof (mze->mze_name));
1238 zap->zap_m.zap_num_entries++;
1239 zap->zap_m.zap_alloc_next = i+1;
1240 if (zap->zap_m.zap_alloc_next ==
1241 zap->zap_m.zap_num_chunks)
1242 zap->zap_m.zap_alloc_next = 0;
1243 mze_insert(zap, i, zn->zn_hash);
1244 return;
1245 }
1246 }
1247 if (start != 0) {
1248 start = 0;
1249 goto again;
1250 }
1251 cmn_err(CE_PANIC, "out of entries!");
1252 }
1253
1254 static int
zap_add_impl(zap_t * zap,const char * key,int integer_size,uint64_t num_integers,const void * val,dmu_tx_t * tx,const void * tag)1255 zap_add_impl(zap_t *zap, const char *key,
1256 int integer_size, uint64_t num_integers,
1257 const void *val, dmu_tx_t *tx, const void *tag)
1258 {
1259 const uint64_t *intval = val;
1260 int err = 0;
1261
1262 zap_name_t *zn = zap_name_alloc_str(zap, key, 0);
1263 if (zn == NULL) {
1264 zap_unlockdir(zap, tag);
1265 return (SET_ERROR(ENOTSUP));
1266 }
1267 if (!zap->zap_ismicro) {
1268 err = fzap_add(zn, integer_size, num_integers, val, tag, tx);
1269 zap = zn->zn_zap; /* fzap_add() may change zap */
1270 } else if (integer_size != 8 || num_integers != 1 ||
1271 strlen(key) >= MZAP_NAME_LEN ||
1272 !mze_canfit_fzap_leaf(zn, zn->zn_hash)) {
1273 err = mzap_upgrade(&zn->zn_zap, tag, tx, 0);
1274 if (err == 0) {
1275 err = fzap_add(zn, integer_size, num_integers, val,
1276 tag, tx);
1277 }
1278 zap = zn->zn_zap; /* fzap_add() may change zap */
1279 } else {
1280 zfs_btree_index_t idx;
1281 if (mze_find(zn, &idx) != NULL) {
1282 err = SET_ERROR(EEXIST);
1283 } else {
1284 mzap_addent(zn, *intval);
1285 }
1286 }
1287 ASSERT(zap == zn->zn_zap);
1288 zap_name_free(zn);
1289 if (zap != NULL) /* may be NULL if fzap_add() failed */
1290 zap_unlockdir(zap, tag);
1291 return (err);
1292 }
1293
1294 int
zap_add(objset_t * os,uint64_t zapobj,const char * key,int integer_size,uint64_t num_integers,const void * val,dmu_tx_t * tx)1295 zap_add(objset_t *os, uint64_t zapobj, const char *key,
1296 int integer_size, uint64_t num_integers,
1297 const void *val, dmu_tx_t *tx)
1298 {
1299 zap_t *zap;
1300 int err;
1301
1302 err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, FTAG, &zap);
1303 if (err != 0)
1304 return (err);
1305 err = zap_add_impl(zap, key, integer_size, num_integers, val, tx, FTAG);
1306 /* zap_add_impl() calls zap_unlockdir() */
1307 return (err);
1308 }
1309
1310 int
zap_add_by_dnode(dnode_t * dn,const char * key,int integer_size,uint64_t num_integers,const void * val,dmu_tx_t * tx)1311 zap_add_by_dnode(dnode_t *dn, const char *key,
1312 int integer_size, uint64_t num_integers,
1313 const void *val, dmu_tx_t *tx)
1314 {
1315 zap_t *zap;
1316 int err;
1317
1318 err = zap_lockdir_by_dnode(dn, tx, RW_WRITER, TRUE, TRUE, FTAG, &zap);
1319 if (err != 0)
1320 return (err);
1321 err = zap_add_impl(zap, key, integer_size, num_integers, val, tx, FTAG);
1322 /* zap_add_impl() calls zap_unlockdir() */
1323 return (err);
1324 }
1325
1326 static int
zap_add_uint64_impl(zap_t * zap,const uint64_t * key,int key_numints,int integer_size,uint64_t num_integers,const void * val,dmu_tx_t * tx,const void * tag)1327 zap_add_uint64_impl(zap_t *zap, const uint64_t *key,
1328 int key_numints, int integer_size, uint64_t num_integers,
1329 const void *val, dmu_tx_t *tx, const void *tag)
1330 {
1331 int err;
1332
1333 zap_name_t *zn = zap_name_alloc_uint64(zap, key, key_numints);
1334 if (zn == NULL) {
1335 zap_unlockdir(zap, tag);
1336 return (SET_ERROR(ENOTSUP));
1337 }
1338 err = fzap_add(zn, integer_size, num_integers, val, tag, tx);
1339 zap = zn->zn_zap; /* fzap_add() may change zap */
1340 zap_name_free(zn);
1341 if (zap != NULL) /* may be NULL if fzap_add() failed */
1342 zap_unlockdir(zap, tag);
1343 return (err);
1344 }
1345
1346 int
zap_add_uint64(objset_t * os,uint64_t zapobj,const uint64_t * key,int key_numints,int integer_size,uint64_t num_integers,const void * val,dmu_tx_t * tx)1347 zap_add_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key,
1348 int key_numints, int integer_size, uint64_t num_integers,
1349 const void *val, dmu_tx_t *tx)
1350 {
1351 zap_t *zap;
1352
1353 int err =
1354 zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, FTAG, &zap);
1355 if (err != 0)
1356 return (err);
1357 err = zap_add_uint64_impl(zap, key, key_numints,
1358 integer_size, num_integers, val, tx, FTAG);
1359 /* zap_add_uint64_impl() calls zap_unlockdir() */
1360 return (err);
1361 }
1362
1363 int
zap_add_uint64_by_dnode(dnode_t * dn,const uint64_t * key,int key_numints,int integer_size,uint64_t num_integers,const void * val,dmu_tx_t * tx)1364 zap_add_uint64_by_dnode(dnode_t *dn, const uint64_t *key,
1365 int key_numints, int integer_size, uint64_t num_integers,
1366 const void *val, dmu_tx_t *tx)
1367 {
1368 zap_t *zap;
1369
1370 int err =
1371 zap_lockdir_by_dnode(dn, tx, RW_WRITER, TRUE, TRUE, FTAG, &zap);
1372 if (err != 0)
1373 return (err);
1374 err = zap_add_uint64_impl(zap, key, key_numints,
1375 integer_size, num_integers, val, tx, FTAG);
1376 /* zap_add_uint64_impl() calls zap_unlockdir() */
1377 return (err);
1378 }
1379
1380 int
zap_update(objset_t * os,uint64_t zapobj,const char * name,int integer_size,uint64_t num_integers,const void * val,dmu_tx_t * tx)1381 zap_update(objset_t *os, uint64_t zapobj, const char *name,
1382 int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx)
1383 {
1384 zap_t *zap;
1385 const uint64_t *intval = val;
1386
1387 int err =
1388 zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, FTAG, &zap);
1389 if (err != 0)
1390 return (err);
1391 zap_name_t *zn = zap_name_alloc_str(zap, name, 0);
1392 if (zn == NULL) {
1393 zap_unlockdir(zap, FTAG);
1394 return (SET_ERROR(ENOTSUP));
1395 }
1396 if (!zap->zap_ismicro) {
1397 err = fzap_update(zn, integer_size, num_integers, val,
1398 FTAG, tx);
1399 zap = zn->zn_zap; /* fzap_update() may change zap */
1400 } else if (integer_size != 8 || num_integers != 1 ||
1401 strlen(name) >= MZAP_NAME_LEN) {
1402 dprintf("upgrading obj %llu: intsz=%u numint=%llu name=%s\n",
1403 (u_longlong_t)zapobj, integer_size,
1404 (u_longlong_t)num_integers, name);
1405 err = mzap_upgrade(&zn->zn_zap, FTAG, tx, 0);
1406 if (err == 0) {
1407 err = fzap_update(zn, integer_size, num_integers,
1408 val, FTAG, tx);
1409 }
1410 zap = zn->zn_zap; /* fzap_update() may change zap */
1411 } else {
1412 zfs_btree_index_t idx;
1413 mzap_ent_t *mze = mze_find(zn, &idx);
1414 if (mze != NULL) {
1415 MZE_PHYS(zap, mze)->mze_value = *intval;
1416 } else {
1417 mzap_addent(zn, *intval);
1418 }
1419 }
1420 ASSERT(zap == zn->zn_zap);
1421 zap_name_free(zn);
1422 if (zap != NULL) /* may be NULL if fzap_upgrade() failed */
1423 zap_unlockdir(zap, FTAG);
1424 return (err);
1425 }
1426
1427 static int
zap_update_uint64_impl(zap_t * zap,const uint64_t * key,int key_numints,int integer_size,uint64_t num_integers,const void * val,dmu_tx_t * tx,const void * tag)1428 zap_update_uint64_impl(zap_t *zap, const uint64_t *key, int key_numints,
1429 int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx,
1430 const void *tag)
1431 {
1432 int err;
1433
1434 zap_name_t *zn = zap_name_alloc_uint64(zap, key, key_numints);
1435 if (zn == NULL) {
1436 zap_unlockdir(zap, tag);
1437 return (SET_ERROR(ENOTSUP));
1438 }
1439 err = fzap_update(zn, integer_size, num_integers, val, tag, tx);
1440 zap = zn->zn_zap; /* fzap_update() may change zap */
1441 zap_name_free(zn);
1442 if (zap != NULL) /* may be NULL if fzap_upgrade() failed */
1443 zap_unlockdir(zap, tag);
1444 return (err);
1445 }
1446
1447 int
zap_update_uint64(objset_t * os,uint64_t zapobj,const uint64_t * key,int key_numints,int integer_size,uint64_t num_integers,const void * val,dmu_tx_t * tx)1448 zap_update_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key,
1449 int key_numints, int integer_size, uint64_t num_integers, const void *val,
1450 dmu_tx_t *tx)
1451 {
1452 zap_t *zap;
1453
1454 int err =
1455 zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, TRUE, FTAG, &zap);
1456 if (err != 0)
1457 return (err);
1458 err = zap_update_uint64_impl(zap, key, key_numints,
1459 integer_size, num_integers, val, tx, FTAG);
1460 /* zap_update_uint64_impl() calls zap_unlockdir() */
1461 return (err);
1462 }
1463
1464 int
zap_update_uint64_by_dnode(dnode_t * dn,const uint64_t * key,int key_numints,int integer_size,uint64_t num_integers,const void * val,dmu_tx_t * tx)1465 zap_update_uint64_by_dnode(dnode_t *dn, const uint64_t *key, int key_numints,
1466 int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx)
1467 {
1468 zap_t *zap;
1469
1470 int err =
1471 zap_lockdir_by_dnode(dn, tx, RW_WRITER, TRUE, TRUE, FTAG, &zap);
1472 if (err != 0)
1473 return (err);
1474 err = zap_update_uint64_impl(zap, key, key_numints,
1475 integer_size, num_integers, val, tx, FTAG);
1476 /* zap_update_uint64_impl() calls zap_unlockdir() */
1477 return (err);
1478 }
1479
1480 int
zap_remove(objset_t * os,uint64_t zapobj,const char * name,dmu_tx_t * tx)1481 zap_remove(objset_t *os, uint64_t zapobj, const char *name, dmu_tx_t *tx)
1482 {
1483 return (zap_remove_norm(os, zapobj, name, 0, tx));
1484 }
1485
1486 static int
zap_remove_impl(zap_t * zap,const char * name,matchtype_t mt,dmu_tx_t * tx)1487 zap_remove_impl(zap_t *zap, const char *name,
1488 matchtype_t mt, dmu_tx_t *tx)
1489 {
1490 int err = 0;
1491
1492 zap_name_t *zn = zap_name_alloc_str(zap, name, mt);
1493 if (zn == NULL)
1494 return (SET_ERROR(ENOTSUP));
1495 if (!zap->zap_ismicro) {
1496 err = fzap_remove(zn, tx);
1497 } else {
1498 zfs_btree_index_t idx;
1499 mzap_ent_t *mze = mze_find(zn, &idx);
1500 if (mze == NULL) {
1501 err = SET_ERROR(ENOENT);
1502 } else {
1503 zap->zap_m.zap_num_entries--;
1504 memset(MZE_PHYS(zap, mze), 0, sizeof (mzap_ent_phys_t));
1505 zfs_btree_remove_idx(&zap->zap_m.zap_tree, &idx);
1506 }
1507 }
1508 zap_name_free(zn);
1509 return (err);
1510 }
1511
1512 int
zap_remove_norm(objset_t * os,uint64_t zapobj,const char * name,matchtype_t mt,dmu_tx_t * tx)1513 zap_remove_norm(objset_t *os, uint64_t zapobj, const char *name,
1514 matchtype_t mt, dmu_tx_t *tx)
1515 {
1516 zap_t *zap;
1517 int err;
1518
1519 err = zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, FALSE, FTAG, &zap);
1520 if (err)
1521 return (err);
1522 err = zap_remove_impl(zap, name, mt, tx);
1523 zap_unlockdir(zap, FTAG);
1524 return (err);
1525 }
1526
1527 int
zap_remove_by_dnode(dnode_t * dn,const char * name,dmu_tx_t * tx)1528 zap_remove_by_dnode(dnode_t *dn, const char *name, dmu_tx_t *tx)
1529 {
1530 zap_t *zap;
1531 int err;
1532
1533 err = zap_lockdir_by_dnode(dn, tx, RW_WRITER, TRUE, FALSE, FTAG, &zap);
1534 if (err)
1535 return (err);
1536 err = zap_remove_impl(zap, name, 0, tx);
1537 zap_unlockdir(zap, FTAG);
1538 return (err);
1539 }
1540
1541 static int
zap_remove_uint64_impl(zap_t * zap,const uint64_t * key,int key_numints,dmu_tx_t * tx,const void * tag)1542 zap_remove_uint64_impl(zap_t *zap, const uint64_t *key, int key_numints,
1543 dmu_tx_t *tx, const void *tag)
1544 {
1545 int err;
1546
1547 zap_name_t *zn = zap_name_alloc_uint64(zap, key, key_numints);
1548 if (zn == NULL) {
1549 zap_unlockdir(zap, tag);
1550 return (SET_ERROR(ENOTSUP));
1551 }
1552 err = fzap_remove(zn, tx);
1553 zap_name_free(zn);
1554 zap_unlockdir(zap, tag);
1555 return (err);
1556 }
1557
1558 int
zap_remove_uint64(objset_t * os,uint64_t zapobj,const uint64_t * key,int key_numints,dmu_tx_t * tx)1559 zap_remove_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key,
1560 int key_numints, dmu_tx_t *tx)
1561 {
1562 zap_t *zap;
1563
1564 int err =
1565 zap_lockdir(os, zapobj, tx, RW_WRITER, TRUE, FALSE, FTAG, &zap);
1566 if (err != 0)
1567 return (err);
1568 err = zap_remove_uint64_impl(zap, key, key_numints, tx, FTAG);
1569 /* zap_remove_uint64_impl() calls zap_unlockdir() */
1570 return (err);
1571 }
1572
1573 int
zap_remove_uint64_by_dnode(dnode_t * dn,const uint64_t * key,int key_numints,dmu_tx_t * tx)1574 zap_remove_uint64_by_dnode(dnode_t *dn, const uint64_t *key, int key_numints,
1575 dmu_tx_t *tx)
1576 {
1577 zap_t *zap;
1578
1579 int err =
1580 zap_lockdir_by_dnode(dn, tx, RW_WRITER, TRUE, FALSE, FTAG, &zap);
1581 if (err != 0)
1582 return (err);
1583 err = zap_remove_uint64_impl(zap, key, key_numints, tx, FTAG);
1584 /* zap_remove_uint64_impl() calls zap_unlockdir() */
1585 return (err);
1586 }
1587
1588 /*
1589 * Routines for iterating over the attributes.
1590 */
1591
1592 static void
zap_cursor_init_impl(zap_cursor_t * zc,objset_t * os,uint64_t zapobj,uint64_t serialized,boolean_t prefetch)1593 zap_cursor_init_impl(zap_cursor_t *zc, objset_t *os, uint64_t zapobj,
1594 uint64_t serialized, boolean_t prefetch)
1595 {
1596 zc->zc_objset = os;
1597 zc->zc_zap = NULL;
1598 zc->zc_leaf = NULL;
1599 zc->zc_zapobj = zapobj;
1600 zc->zc_serialized = serialized;
1601 zc->zc_hash = 0;
1602 zc->zc_cd = 0;
1603 zc->zc_prefetch = prefetch;
1604 }
1605 void
zap_cursor_init_serialized(zap_cursor_t * zc,objset_t * os,uint64_t zapobj,uint64_t serialized)1606 zap_cursor_init_serialized(zap_cursor_t *zc, objset_t *os, uint64_t zapobj,
1607 uint64_t serialized)
1608 {
1609 zap_cursor_init_impl(zc, os, zapobj, serialized, B_TRUE);
1610 }
1611
1612 /*
1613 * Initialize a cursor at the beginning of the ZAP object. The entire
1614 * ZAP object will be prefetched.
1615 */
1616 void
zap_cursor_init(zap_cursor_t * zc,objset_t * os,uint64_t zapobj)1617 zap_cursor_init(zap_cursor_t *zc, objset_t *os, uint64_t zapobj)
1618 {
1619 zap_cursor_init_impl(zc, os, zapobj, 0, B_TRUE);
1620 }
1621
1622 /*
1623 * Initialize a cursor at the beginning, but request that we not prefetch
1624 * the entire ZAP object.
1625 */
1626 void
zap_cursor_init_noprefetch(zap_cursor_t * zc,objset_t * os,uint64_t zapobj)1627 zap_cursor_init_noprefetch(zap_cursor_t *zc, objset_t *os, uint64_t zapobj)
1628 {
1629 zap_cursor_init_impl(zc, os, zapobj, 0, B_FALSE);
1630 }
1631
1632 void
zap_cursor_fini(zap_cursor_t * zc)1633 zap_cursor_fini(zap_cursor_t *zc)
1634 {
1635 if (zc->zc_zap) {
1636 rw_enter(&zc->zc_zap->zap_rwlock, RW_READER);
1637 zap_unlockdir(zc->zc_zap, NULL);
1638 zc->zc_zap = NULL;
1639 }
1640 if (zc->zc_leaf) {
1641 rw_enter(&zc->zc_leaf->l_rwlock, RW_READER);
1642 zap_put_leaf(zc->zc_leaf);
1643 zc->zc_leaf = NULL;
1644 }
1645 zc->zc_objset = NULL;
1646 }
1647
1648 uint64_t
zap_cursor_serialize(zap_cursor_t * zc)1649 zap_cursor_serialize(zap_cursor_t *zc)
1650 {
1651 if (zc->zc_hash == -1ULL)
1652 return (-1ULL);
1653 if (zc->zc_zap == NULL)
1654 return (zc->zc_serialized);
1655 ASSERT((zc->zc_hash & zap_maxcd(zc->zc_zap)) == 0);
1656 ASSERT(zc->zc_cd < zap_maxcd(zc->zc_zap));
1657
1658 /*
1659 * We want to keep the high 32 bits of the cursor zero if we can, so
1660 * that 32-bit programs can access this. So usually use a small
1661 * (28-bit) hash value so we can fit 4 bits of cd into the low 32-bits
1662 * of the cursor.
1663 *
1664 * [ collision differentiator | zap_hashbits()-bit hash value ]
1665 */
1666 return ((zc->zc_hash >> (64 - zap_hashbits(zc->zc_zap))) |
1667 ((uint64_t)zc->zc_cd << zap_hashbits(zc->zc_zap)));
1668 }
1669
1670 int
zap_cursor_retrieve(zap_cursor_t * zc,zap_attribute_t * za)1671 zap_cursor_retrieve(zap_cursor_t *zc, zap_attribute_t *za)
1672 {
1673 int err;
1674
1675 if (zc->zc_hash == -1ULL)
1676 return (SET_ERROR(ENOENT));
1677
1678 if (zc->zc_zap == NULL) {
1679 int hb;
1680 err = zap_lockdir(zc->zc_objset, zc->zc_zapobj, NULL,
1681 RW_READER, TRUE, FALSE, NULL, &zc->zc_zap);
1682 if (err != 0)
1683 return (err);
1684
1685 /*
1686 * To support zap_cursor_init_serialized, advance, retrieve,
1687 * we must add to the existing zc_cd, which may already
1688 * be 1 due to the zap_cursor_advance.
1689 */
1690 ASSERT(zc->zc_hash == 0);
1691 hb = zap_hashbits(zc->zc_zap);
1692 zc->zc_hash = zc->zc_serialized << (64 - hb);
1693 zc->zc_cd += zc->zc_serialized >> hb;
1694 if (zc->zc_cd >= zap_maxcd(zc->zc_zap)) /* corrupt serialized */
1695 zc->zc_cd = 0;
1696 } else {
1697 rw_enter(&zc->zc_zap->zap_rwlock, RW_READER);
1698 }
1699 if (!zc->zc_zap->zap_ismicro) {
1700 err = fzap_cursor_retrieve(zc->zc_zap, zc, za);
1701 } else {
1702 zfs_btree_index_t idx;
1703 mzap_ent_t mze_tofind;
1704
1705 mze_tofind.mze_hash = zc->zc_hash >> 32;
1706 mze_tofind.mze_cd = zc->zc_cd;
1707
1708 mzap_ent_t *mze = zfs_btree_find(&zc->zc_zap->zap_m.zap_tree,
1709 &mze_tofind, &idx);
1710 if (mze == NULL) {
1711 mze = zfs_btree_next(&zc->zc_zap->zap_m.zap_tree,
1712 &idx, &idx);
1713 }
1714 if (mze) {
1715 mzap_ent_phys_t *mzep = MZE_PHYS(zc->zc_zap, mze);
1716 ASSERT3U(mze->mze_cd, ==, mzep->mze_cd);
1717 za->za_normalization_conflict =
1718 mzap_normalization_conflict(zc->zc_zap, NULL,
1719 mze, &idx);
1720 za->za_integer_length = 8;
1721 za->za_num_integers = 1;
1722 za->za_first_integer = mzep->mze_value;
1723 (void) strlcpy(za->za_name, mzep->mze_name,
1724 sizeof (za->za_name));
1725 zc->zc_hash = (uint64_t)mze->mze_hash << 32;
1726 zc->zc_cd = mze->mze_cd;
1727 err = 0;
1728 } else {
1729 zc->zc_hash = -1ULL;
1730 err = SET_ERROR(ENOENT);
1731 }
1732 }
1733 rw_exit(&zc->zc_zap->zap_rwlock);
1734 return (err);
1735 }
1736
1737 void
zap_cursor_advance(zap_cursor_t * zc)1738 zap_cursor_advance(zap_cursor_t *zc)
1739 {
1740 if (zc->zc_hash == -1ULL)
1741 return;
1742 zc->zc_cd++;
1743 }
1744
1745 int
zap_get_stats(objset_t * os,uint64_t zapobj,zap_stats_t * zs)1746 zap_get_stats(objset_t *os, uint64_t zapobj, zap_stats_t *zs)
1747 {
1748 zap_t *zap;
1749
1750 int err =
1751 zap_lockdir(os, zapobj, NULL, RW_READER, TRUE, FALSE, FTAG, &zap);
1752 if (err != 0)
1753 return (err);
1754
1755 memset(zs, 0, sizeof (zap_stats_t));
1756
1757 if (zap->zap_ismicro) {
1758 zs->zs_blocksize = zap->zap_dbuf->db_size;
1759 zs->zs_num_entries = zap->zap_m.zap_num_entries;
1760 zs->zs_num_blocks = 1;
1761 } else {
1762 fzap_get_stats(zap, zs);
1763 }
1764 zap_unlockdir(zap, FTAG);
1765 return (0);
1766 }
1767
1768 #if defined(_KERNEL)
1769 EXPORT_SYMBOL(zap_create);
1770 EXPORT_SYMBOL(zap_create_dnsize);
1771 EXPORT_SYMBOL(zap_create_norm);
1772 EXPORT_SYMBOL(zap_create_norm_dnsize);
1773 EXPORT_SYMBOL(zap_create_flags);
1774 EXPORT_SYMBOL(zap_create_flags_dnsize);
1775 EXPORT_SYMBOL(zap_create_claim);
1776 EXPORT_SYMBOL(zap_create_claim_norm);
1777 EXPORT_SYMBOL(zap_create_claim_norm_dnsize);
1778 EXPORT_SYMBOL(zap_create_hold);
1779 EXPORT_SYMBOL(zap_destroy);
1780 EXPORT_SYMBOL(zap_lookup);
1781 EXPORT_SYMBOL(zap_lookup_by_dnode);
1782 EXPORT_SYMBOL(zap_lookup_norm);
1783 EXPORT_SYMBOL(zap_lookup_uint64);
1784 EXPORT_SYMBOL(zap_contains);
1785 EXPORT_SYMBOL(zap_prefetch);
1786 EXPORT_SYMBOL(zap_prefetch_uint64);
1787 EXPORT_SYMBOL(zap_add);
1788 EXPORT_SYMBOL(zap_add_by_dnode);
1789 EXPORT_SYMBOL(zap_add_uint64);
1790 EXPORT_SYMBOL(zap_add_uint64_by_dnode);
1791 EXPORT_SYMBOL(zap_update);
1792 EXPORT_SYMBOL(zap_update_uint64);
1793 EXPORT_SYMBOL(zap_update_uint64_by_dnode);
1794 EXPORT_SYMBOL(zap_length);
1795 EXPORT_SYMBOL(zap_length_uint64);
1796 EXPORT_SYMBOL(zap_remove);
1797 EXPORT_SYMBOL(zap_remove_by_dnode);
1798 EXPORT_SYMBOL(zap_remove_norm);
1799 EXPORT_SYMBOL(zap_remove_uint64);
1800 EXPORT_SYMBOL(zap_remove_uint64_by_dnode);
1801 EXPORT_SYMBOL(zap_count);
1802 EXPORT_SYMBOL(zap_value_search);
1803 EXPORT_SYMBOL(zap_join);
1804 EXPORT_SYMBOL(zap_join_increment);
1805 EXPORT_SYMBOL(zap_add_int);
1806 EXPORT_SYMBOL(zap_remove_int);
1807 EXPORT_SYMBOL(zap_lookup_int);
1808 EXPORT_SYMBOL(zap_increment_int);
1809 EXPORT_SYMBOL(zap_add_int_key);
1810 EXPORT_SYMBOL(zap_lookup_int_key);
1811 EXPORT_SYMBOL(zap_increment);
1812 EXPORT_SYMBOL(zap_cursor_init);
1813 EXPORT_SYMBOL(zap_cursor_fini);
1814 EXPORT_SYMBOL(zap_cursor_retrieve);
1815 EXPORT_SYMBOL(zap_cursor_advance);
1816 EXPORT_SYMBOL(zap_cursor_serialize);
1817 EXPORT_SYMBOL(zap_cursor_init_serialized);
1818 EXPORT_SYMBOL(zap_get_stats);
1819
1820 /* CSTYLED */
1821 ZFS_MODULE_PARAM(zfs, , zap_micro_max_size, INT, ZMOD_RW,
1822 "Maximum micro ZAP size, before converting to a fat ZAP, in bytes");
1823 #endif
1824