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 http://www.opensolaris.org/os/licensing.
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 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2012, 2016 by Delphix. All rights reserved.
24 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
25 */
26
27 /*
28 * This file contains the top half of the zfs directory structure
29 * implementation. The bottom half is in zap_leaf.c.
30 *
31 * The zdir is an extendable hash data structure. There is a table of
32 * pointers to buckets (zap_t->zd_data->zd_leafs). The buckets are
33 * each a constant size and hold a variable number of directory entries.
34 * The buckets (aka "leaf nodes") are implemented in zap_leaf.c.
35 *
36 * The pointer table holds a power of 2 number of pointers.
37 * (1<<zap_t->zd_data->zd_phys->zd_prefix_len). The bucket pointed to
38 * by the pointer at index i in the table holds entries whose hash value
39 * has a zd_prefix_len - bit prefix
40 */
41
42 #include <sys/spa.h>
43 #include <sys/dmu.h>
44 #include <sys/zfs_context.h>
45 #include <sys/zfs_znode.h>
46 #include <sys/fs/zfs.h>
47 #include <sys/zap.h>
48 #include <sys/refcount.h>
49 #include <sys/zap_impl.h>
50 #include <sys/zap_leaf.h>
51
52 int fzap_default_block_shift = 14; /* 16k blocksize */
53
54 extern inline zap_phys_t *zap_f_phys(zap_t *zap);
55
56 static uint64_t zap_allocate_blocks(zap_t *zap, int nblocks);
57
58 void
59 fzap_byteswap(void *vbuf, size_t size)
60 {
61 uint64_t block_type;
62
63 block_type = *(uint64_t *)vbuf;
64
65 if (block_type == ZBT_LEAF || block_type == BSWAP_64(ZBT_LEAF))
66 zap_leaf_byteswap(vbuf, size);
67 else {
68 /* it's a ptrtbl block */
69 byteswap_uint64_array(vbuf, size);
70 }
71 }
72
73 void
74 fzap_upgrade(zap_t *zap, dmu_tx_t *tx, zap_flags_t flags)
75 {
76 dmu_buf_t *db;
77 zap_leaf_t *l;
78 int i;
79 zap_phys_t *zp;
80
81 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
82 zap->zap_ismicro = FALSE;
83
84 zap->zap_dbu.dbu_evict_func_sync = zap_evict_sync;
85 zap->zap_dbu.dbu_evict_func_async = NULL;
86
87 mutex_init(&zap->zap_f.zap_num_entries_mtx, 0, 0, 0);
88 zap->zap_f.zap_block_shift = highbit64(zap->zap_dbuf->db_size) - 1;
89
90 zp = zap_f_phys(zap);
91 /*
92 * explicitly zero it since it might be coming from an
93 * initialized microzap
94 */
95 bzero(zap->zap_dbuf->db_data, zap->zap_dbuf->db_size);
96 zp->zap_block_type = ZBT_HEADER;
97 zp->zap_magic = ZAP_MAGIC;
98
99 zp->zap_ptrtbl.zt_shift = ZAP_EMBEDDED_PTRTBL_SHIFT(zap);
100
101 zp->zap_freeblk = 2; /* block 1 will be the first leaf */
102 zp->zap_num_leafs = 1;
103 zp->zap_num_entries = 0;
104 zp->zap_salt = zap->zap_salt;
105 zp->zap_normflags = zap->zap_normflags;
106 zp->zap_flags = flags;
107
108 /* block 1 will be the first leaf */
109 for (i = 0; i < (1<<zp->zap_ptrtbl.zt_shift); i++)
110 ZAP_EMBEDDED_PTRTBL_ENT(zap, i) = 1;
111
112 /*
113 * set up block 1 - the first leaf
114 */
115 VERIFY(0 == dmu_buf_hold(zap->zap_objset, zap->zap_object,
116 1<<FZAP_BLOCK_SHIFT(zap), FTAG, &db, DMU_READ_NO_PREFETCH));
117 dmu_buf_will_dirty(db, tx);
118
119 l = kmem_zalloc(sizeof (zap_leaf_t), KM_SLEEP);
120 l->l_dbuf = db;
121
122 zap_leaf_init(l, zp->zap_normflags != 0);
123
124 kmem_free(l, sizeof (zap_leaf_t));
125 dmu_buf_rele(db, FTAG);
126 }
127
128 static int
129 zap_tryupgradedir(zap_t *zap, dmu_tx_t *tx)
130 {
131 if (RW_WRITE_HELD(&zap->zap_rwlock))
132 return (1);
133 if (rw_tryupgrade(&zap->zap_rwlock)) {
134 dmu_buf_will_dirty(zap->zap_dbuf, tx);
135 return (1);
136 }
137 return (0);
138 }
139
140 /*
141 * Generic routines for dealing with the pointer & cookie tables.
142 */
143
144 static int
145 zap_table_grow(zap_t *zap, zap_table_phys_t *tbl,
146 void (*transfer_func)(const uint64_t *src, uint64_t *dst, int n),
147 dmu_tx_t *tx)
148 {
149 uint64_t b, newblk;
150 dmu_buf_t *db_old, *db_new;
151 int err;
152 int bs = FZAP_BLOCK_SHIFT(zap);
153 int hepb = 1<<(bs-4);
154 /* hepb = half the number of entries in a block */
155
156 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
157 ASSERT(tbl->zt_blk != 0);
158 ASSERT(tbl->zt_numblks > 0);
159
160 if (tbl->zt_nextblk != 0) {
161 newblk = tbl->zt_nextblk;
162 } else {
163 newblk = zap_allocate_blocks(zap, tbl->zt_numblks * 2);
164 tbl->zt_nextblk = newblk;
165 ASSERT0(tbl->zt_blks_copied);
166 dmu_prefetch(zap->zap_objset, zap->zap_object, 0,
167 tbl->zt_blk << bs, tbl->zt_numblks << bs,
168 ZIO_PRIORITY_SYNC_READ);
169 }
170
171 /*
172 * Copy the ptrtbl from the old to new location.
173 */
174
175 b = tbl->zt_blks_copied;
176 err = dmu_buf_hold(zap->zap_objset, zap->zap_object,
177 (tbl->zt_blk + b) << bs, FTAG, &db_old, DMU_READ_NO_PREFETCH);
178 if (err)
179 return (err);
180
181 /* first half of entries in old[b] go to new[2*b+0] */
182 VERIFY(0 == dmu_buf_hold(zap->zap_objset, zap->zap_object,
183 (newblk + 2*b+0) << bs, FTAG, &db_new, DMU_READ_NO_PREFETCH));
184 dmu_buf_will_dirty(db_new, tx);
185 transfer_func(db_old->db_data, db_new->db_data, hepb);
186 dmu_buf_rele(db_new, FTAG);
187
188 /* second half of entries in old[b] go to new[2*b+1] */
189 VERIFY(0 == dmu_buf_hold(zap->zap_objset, zap->zap_object,
190 (newblk + 2*b+1) << bs, FTAG, &db_new, DMU_READ_NO_PREFETCH));
191 dmu_buf_will_dirty(db_new, tx);
192 transfer_func((uint64_t *)db_old->db_data + hepb,
193 db_new->db_data, hepb);
194 dmu_buf_rele(db_new, FTAG);
195
196 dmu_buf_rele(db_old, FTAG);
197
198 tbl->zt_blks_copied++;
199
200 dprintf("copied block %llu of %llu\n",
201 tbl->zt_blks_copied, tbl->zt_numblks);
202
203 if (tbl->zt_blks_copied == tbl->zt_numblks) {
204 (void) dmu_free_range(zap->zap_objset, zap->zap_object,
205 tbl->zt_blk << bs, tbl->zt_numblks << bs, tx);
206
207 tbl->zt_blk = newblk;
208 tbl->zt_numblks *= 2;
209 tbl->zt_shift++;
210 tbl->zt_nextblk = 0;
211 tbl->zt_blks_copied = 0;
212
213 dprintf("finished; numblocks now %llu (%lluk entries)\n",
214 tbl->zt_numblks, 1<<(tbl->zt_shift-10));
215 }
216
217 return (0);
218 }
219
220 static int
221 zap_table_store(zap_t *zap, zap_table_phys_t *tbl, uint64_t idx, uint64_t val,
222 dmu_tx_t *tx)
223 {
224 int err;
225 uint64_t blk, off;
226 int bs = FZAP_BLOCK_SHIFT(zap);
227 dmu_buf_t *db;
228
229 ASSERT(RW_LOCK_HELD(&zap->zap_rwlock));
230 ASSERT(tbl->zt_blk != 0);
231
232 dprintf("storing %llx at index %llx\n", val, idx);
233
234 blk = idx >> (bs-3);
235 off = idx & ((1<<(bs-3))-1);
236
237 err = dmu_buf_hold(zap->zap_objset, zap->zap_object,
238 (tbl->zt_blk + blk) << bs, FTAG, &db, DMU_READ_NO_PREFETCH);
239 if (err)
240 return (err);
241 dmu_buf_will_dirty(db, tx);
242
243 if (tbl->zt_nextblk != 0) {
244 uint64_t idx2 = idx * 2;
245 uint64_t blk2 = idx2 >> (bs-3);
246 uint64_t off2 = idx2 & ((1<<(bs-3))-1);
247 dmu_buf_t *db2;
248
249 err = dmu_buf_hold(zap->zap_objset, zap->zap_object,
250 (tbl->zt_nextblk + blk2) << bs, FTAG, &db2,
251 DMU_READ_NO_PREFETCH);
252 if (err) {
253 dmu_buf_rele(db, FTAG);
254 return (err);
255 }
256 dmu_buf_will_dirty(db2, tx);
257 ((uint64_t *)db2->db_data)[off2] = val;
258 ((uint64_t *)db2->db_data)[off2+1] = val;
259 dmu_buf_rele(db2, FTAG);
260 }
261
262 ((uint64_t *)db->db_data)[off] = val;
263 dmu_buf_rele(db, FTAG);
264
265 return (0);
266 }
267
268 static int
269 zap_table_load(zap_t *zap, zap_table_phys_t *tbl, uint64_t idx, uint64_t *valp)
270 {
271 uint64_t blk, off;
272 int err;
273 dmu_buf_t *db;
274 dnode_t *dn;
275 int bs = FZAP_BLOCK_SHIFT(zap);
276
277 ASSERT(RW_LOCK_HELD(&zap->zap_rwlock));
278
279 blk = idx >> (bs-3);
280 off = idx & ((1<<(bs-3))-1);
281
282 /*
283 * Note: this is equivalent to dmu_buf_hold(), but we use
284 * _dnode_enter / _by_dnode because it's faster because we don't
285 * have to hold the dnode.
286 */
287 dn = dmu_buf_dnode_enter(zap->zap_dbuf);
288 err = dmu_buf_hold_by_dnode(dn,
289 (tbl->zt_blk + blk) << bs, FTAG, &db, DMU_READ_NO_PREFETCH);
290 dmu_buf_dnode_exit(zap->zap_dbuf);
291 if (err)
292 return (err);
293 *valp = ((uint64_t *)db->db_data)[off];
294 dmu_buf_rele(db, FTAG);
295
296 if (tbl->zt_nextblk != 0) {
297 /*
298 * read the nextblk for the sake of i/o error checking,
299 * so that zap_table_load() will catch errors for
300 * zap_table_store.
301 */
302 blk = (idx*2) >> (bs-3);
303
304 dn = dmu_buf_dnode_enter(zap->zap_dbuf);
305 err = dmu_buf_hold_by_dnode(dn,
306 (tbl->zt_nextblk + blk) << bs, FTAG, &db,
307 DMU_READ_NO_PREFETCH);
308 dmu_buf_dnode_exit(zap->zap_dbuf);
309 if (err == 0)
310 dmu_buf_rele(db, FTAG);
311 }
312 return (err);
313 }
314
315 /*
316 * Routines for growing the ptrtbl.
317 */
318
319 static void
320 zap_ptrtbl_transfer(const uint64_t *src, uint64_t *dst, int n)
321 {
322 int i;
323 for (i = 0; i < n; i++) {
324 uint64_t lb = src[i];
325 dst[2*i+0] = lb;
326 dst[2*i+1] = lb;
327 }
328 }
329
330 static int
331 zap_grow_ptrtbl(zap_t *zap, dmu_tx_t *tx)
332 {
333 /*
334 * The pointer table should never use more hash bits than we
335 * have (otherwise we'd be using useless zero bits to index it).
336 * If we are within 2 bits of running out, stop growing, since
337 * this is already an aberrant condition.
338 */
339 if (zap_f_phys(zap)->zap_ptrtbl.zt_shift >= zap_hashbits(zap) - 2)
340 return (SET_ERROR(ENOSPC));
341
342 if (zap_f_phys(zap)->zap_ptrtbl.zt_numblks == 0) {
343 /*
344 * We are outgrowing the "embedded" ptrtbl (the one
345 * stored in the header block). Give it its own entire
346 * block, which will double the size of the ptrtbl.
347 */
348 uint64_t newblk;
349 dmu_buf_t *db_new;
350 int err;
351
352 ASSERT3U(zap_f_phys(zap)->zap_ptrtbl.zt_shift, ==,
353 ZAP_EMBEDDED_PTRTBL_SHIFT(zap));
354 ASSERT0(zap_f_phys(zap)->zap_ptrtbl.zt_blk);
355
356 newblk = zap_allocate_blocks(zap, 1);
357 err = dmu_buf_hold(zap->zap_objset, zap->zap_object,
358 newblk << FZAP_BLOCK_SHIFT(zap), FTAG, &db_new,
359 DMU_READ_NO_PREFETCH);
360 if (err)
361 return (err);
362 dmu_buf_will_dirty(db_new, tx);
363 zap_ptrtbl_transfer(&ZAP_EMBEDDED_PTRTBL_ENT(zap, 0),
364 db_new->db_data, 1 << ZAP_EMBEDDED_PTRTBL_SHIFT(zap));
365 dmu_buf_rele(db_new, FTAG);
366
367 zap_f_phys(zap)->zap_ptrtbl.zt_blk = newblk;
368 zap_f_phys(zap)->zap_ptrtbl.zt_numblks = 1;
369 zap_f_phys(zap)->zap_ptrtbl.zt_shift++;
370
371 ASSERT3U(1ULL << zap_f_phys(zap)->zap_ptrtbl.zt_shift, ==,
372 zap_f_phys(zap)->zap_ptrtbl.zt_numblks <<
373 (FZAP_BLOCK_SHIFT(zap)-3));
374
375 return (0);
376 } else {
377 return (zap_table_grow(zap, &zap_f_phys(zap)->zap_ptrtbl,
378 zap_ptrtbl_transfer, tx));
379 }
380 }
381
382 static void
383 zap_increment_num_entries(zap_t *zap, int delta, dmu_tx_t *tx)
384 {
385 dmu_buf_will_dirty(zap->zap_dbuf, tx);
386 mutex_enter(&zap->zap_f.zap_num_entries_mtx);
387 ASSERT(delta > 0 || zap_f_phys(zap)->zap_num_entries >= -delta);
388 zap_f_phys(zap)->zap_num_entries += delta;
389 mutex_exit(&zap->zap_f.zap_num_entries_mtx);
390 }
391
392 static uint64_t
393 zap_allocate_blocks(zap_t *zap, int nblocks)
394 {
395 uint64_t newblk;
396 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
397 newblk = zap_f_phys(zap)->zap_freeblk;
398 zap_f_phys(zap)->zap_freeblk += nblocks;
399 return (newblk);
400 }
401
402 static void
403 zap_leaf_evict_sync(void *dbu)
404 {
405 zap_leaf_t *l = dbu;
406
407 rw_destroy(&l->l_rwlock);
408 kmem_free(l, sizeof (zap_leaf_t));
409 }
410
411 static zap_leaf_t *
412 zap_create_leaf(zap_t *zap, dmu_tx_t *tx)
413 {
414 void *winner;
415 zap_leaf_t *l = kmem_zalloc(sizeof (zap_leaf_t), KM_SLEEP);
416
417 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
418
419 rw_init(&l->l_rwlock, 0, 0, 0);
420 rw_enter(&l->l_rwlock, RW_WRITER);
421 l->l_blkid = zap_allocate_blocks(zap, 1);
422 l->l_dbuf = NULL;
423
424 VERIFY(0 == dmu_buf_hold(zap->zap_objset, zap->zap_object,
425 l->l_blkid << FZAP_BLOCK_SHIFT(zap), NULL, &l->l_dbuf,
426 DMU_READ_NO_PREFETCH));
427 dmu_buf_init_user(&l->l_dbu, zap_leaf_evict_sync, NULL, &l->l_dbuf);
428 winner = dmu_buf_set_user(l->l_dbuf, &l->l_dbu);
429 ASSERT(winner == NULL);
430 dmu_buf_will_dirty(l->l_dbuf, tx);
431
432 zap_leaf_init(l, zap->zap_normflags != 0);
433
434 zap_f_phys(zap)->zap_num_leafs++;
435
436 return (l);
437 }
438
439 int
440 fzap_count(zap_t *zap, uint64_t *count)
441 {
442 ASSERT(!zap->zap_ismicro);
443 mutex_enter(&zap->zap_f.zap_num_entries_mtx); /* unnecessary */
444 *count = zap_f_phys(zap)->zap_num_entries;
445 mutex_exit(&zap->zap_f.zap_num_entries_mtx);
446 return (0);
447 }
448
449 /*
450 * Routines for obtaining zap_leaf_t's
451 */
452
453 void
454 zap_put_leaf(zap_leaf_t *l)
455 {
456 rw_exit(&l->l_rwlock);
457 dmu_buf_rele(l->l_dbuf, NULL);
458 }
459
460 static zap_leaf_t *
461 zap_open_leaf(uint64_t blkid, dmu_buf_t *db)
462 {
463 zap_leaf_t *l, *winner;
464
465 ASSERT(blkid != 0);
466
467 l = kmem_zalloc(sizeof (zap_leaf_t), KM_SLEEP);
468 rw_init(&l->l_rwlock, 0, 0, 0);
469 rw_enter(&l->l_rwlock, RW_WRITER);
470 l->l_blkid = blkid;
471 l->l_bs = highbit64(db->db_size) - 1;
472 l->l_dbuf = db;
473
474 dmu_buf_init_user(&l->l_dbu, zap_leaf_evict_sync, NULL, &l->l_dbuf);
475 winner = dmu_buf_set_user(db, &l->l_dbu);
476
477 rw_exit(&l->l_rwlock);
478 if (winner != NULL) {
479 /* someone else set it first */
480 zap_leaf_evict_sync(&l->l_dbu);
481 l = winner;
482 }
483
484 /*
485 * lhr_pad was previously used for the next leaf in the leaf
486 * chain. There should be no chained leafs (as we have removed
487 * support for them).
488 */
489 ASSERT0(zap_leaf_phys(l)->l_hdr.lh_pad1);
490
491 /*
492 * There should be more hash entries than there can be
493 * chunks to put in the hash table
494 */
495 ASSERT3U(ZAP_LEAF_HASH_NUMENTRIES(l), >, ZAP_LEAF_NUMCHUNKS(l) / 3);
496
497 /* The chunks should begin at the end of the hash table */
498 ASSERT3P(&ZAP_LEAF_CHUNK(l, 0), ==,
499 &zap_leaf_phys(l)->l_hash[ZAP_LEAF_HASH_NUMENTRIES(l)]);
500
501 /* The chunks should end at the end of the block */
502 ASSERT3U((uintptr_t)&ZAP_LEAF_CHUNK(l, ZAP_LEAF_NUMCHUNKS(l)) -
503 (uintptr_t)zap_leaf_phys(l), ==, l->l_dbuf->db_size);
504
505 return (l);
506 }
507
508 static int
509 zap_get_leaf_byblk(zap_t *zap, uint64_t blkid, dmu_tx_t *tx, krw_t lt,
510 zap_leaf_t **lp)
511 {
512 dmu_buf_t *db;
513 zap_leaf_t *l;
514 int bs = FZAP_BLOCK_SHIFT(zap);
515 int err;
516
517 ASSERT(RW_LOCK_HELD(&zap->zap_rwlock));
518
519 dnode_t *dn = dmu_buf_dnode_enter(zap->zap_dbuf);
520 err = dmu_buf_hold_by_dnode(dn,
521 blkid << bs, NULL, &db, DMU_READ_NO_PREFETCH);
522 dmu_buf_dnode_exit(zap->zap_dbuf);
523 if (err)
524 return (err);
525
526 ASSERT3U(db->db_object, ==, zap->zap_object);
527 ASSERT3U(db->db_offset, ==, blkid << bs);
528 ASSERT3U(db->db_size, ==, 1 << bs);
529 ASSERT(blkid != 0);
530
531 l = dmu_buf_get_user(db);
532
533 if (l == NULL)
534 l = zap_open_leaf(blkid, db);
535
536 rw_enter(&l->l_rwlock, lt);
537 /*
538 * Must lock before dirtying, otherwise zap_leaf_phys(l) could change,
539 * causing ASSERT below to fail.
540 */
541 if (lt == RW_WRITER)
542 dmu_buf_will_dirty(db, tx);
543 ASSERT3U(l->l_blkid, ==, blkid);
544 ASSERT3P(l->l_dbuf, ==, db);
545 ASSERT3U(zap_leaf_phys(l)->l_hdr.lh_block_type, ==, ZBT_LEAF);
546 ASSERT3U(zap_leaf_phys(l)->l_hdr.lh_magic, ==, ZAP_LEAF_MAGIC);
547
548 *lp = l;
549 return (0);
550 }
551
552 static int
553 zap_idx_to_blk(zap_t *zap, uint64_t idx, uint64_t *valp)
554 {
555 ASSERT(RW_LOCK_HELD(&zap->zap_rwlock));
556
557 if (zap_f_phys(zap)->zap_ptrtbl.zt_numblks == 0) {
558 ASSERT3U(idx, <,
559 (1ULL << zap_f_phys(zap)->zap_ptrtbl.zt_shift));
560 *valp = ZAP_EMBEDDED_PTRTBL_ENT(zap, idx);
561 return (0);
562 } else {
563 return (zap_table_load(zap, &zap_f_phys(zap)->zap_ptrtbl,
564 idx, valp));
565 }
566 }
567
568 static int
569 zap_set_idx_to_blk(zap_t *zap, uint64_t idx, uint64_t blk, dmu_tx_t *tx)
570 {
571 ASSERT(tx != NULL);
572 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
573
574 if (zap_f_phys(zap)->zap_ptrtbl.zt_blk == 0) {
575 ZAP_EMBEDDED_PTRTBL_ENT(zap, idx) = blk;
576 return (0);
577 } else {
578 return (zap_table_store(zap, &zap_f_phys(zap)->zap_ptrtbl,
579 idx, blk, tx));
580 }
581 }
582
583 static int
584 zap_deref_leaf(zap_t *zap, uint64_t h, dmu_tx_t *tx, krw_t lt, zap_leaf_t **lp)
585 {
586 uint64_t idx, blk;
587 int err;
588
589 ASSERT(zap->zap_dbuf == NULL ||
590 zap_f_phys(zap) == zap->zap_dbuf->db_data);
591
592 /* Reality check for corrupt zap objects (leaf or header). */
593 if ((zap_f_phys(zap)->zap_block_type != ZBT_LEAF &&
594 zap_f_phys(zap)->zap_block_type != ZBT_HEADER) ||
595 zap_f_phys(zap)->zap_magic != ZAP_MAGIC) {
596 return (SET_ERROR(EIO));
597 }
598
599 idx = ZAP_HASH_IDX(h, zap_f_phys(zap)->zap_ptrtbl.zt_shift);
600 err = zap_idx_to_blk(zap, idx, &blk);
601 if (err != 0)
602 return (err);
603 err = zap_get_leaf_byblk(zap, blk, tx, lt, lp);
604
605 ASSERT(err ||
606 ZAP_HASH_IDX(h, zap_leaf_phys(*lp)->l_hdr.lh_prefix_len) ==
607 zap_leaf_phys(*lp)->l_hdr.lh_prefix);
608 return (err);
609 }
610
611 static int
612 zap_expand_leaf(zap_name_t *zn, zap_leaf_t *l,
613 void *tag, dmu_tx_t *tx, zap_leaf_t **lp)
614 {
615 zap_t *zap = zn->zn_zap;
616 uint64_t hash = zn->zn_hash;
617 zap_leaf_t *nl;
618 int prefix_diff, i, err;
619 uint64_t sibling;
620 int old_prefix_len = zap_leaf_phys(l)->l_hdr.lh_prefix_len;
621
622 ASSERT3U(old_prefix_len, <=, zap_f_phys(zap)->zap_ptrtbl.zt_shift);
623 ASSERT(RW_LOCK_HELD(&zap->zap_rwlock));
624
625 ASSERT3U(ZAP_HASH_IDX(hash, old_prefix_len), ==,
626 zap_leaf_phys(l)->l_hdr.lh_prefix);
627
628 if (zap_tryupgradedir(zap, tx) == 0 ||
629 old_prefix_len == zap_f_phys(zap)->zap_ptrtbl.zt_shift) {
630 /* We failed to upgrade, or need to grow the pointer table */
631 objset_t *os = zap->zap_objset;
632 uint64_t object = zap->zap_object;
633
634 zap_put_leaf(l);
635 zap_unlockdir(zap, tag);
636 err = zap_lockdir(os, object, tx, RW_WRITER,
637 FALSE, FALSE, tag, &zn->zn_zap);
638 zap = zn->zn_zap;
639 if (err)
640 return (err);
641 ASSERT(!zap->zap_ismicro);
642
643 while (old_prefix_len ==
644 zap_f_phys(zap)->zap_ptrtbl.zt_shift) {
645 err = zap_grow_ptrtbl(zap, tx);
646 if (err)
647 return (err);
648 }
649
650 err = zap_deref_leaf(zap, hash, tx, RW_WRITER, &l);
651 if (err)
652 return (err);
653
654 if (zap_leaf_phys(l)->l_hdr.lh_prefix_len != old_prefix_len) {
655 /* it split while our locks were down */
656 *lp = l;
657 return (0);
658 }
659 }
660 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
661 ASSERT3U(old_prefix_len, <, zap_f_phys(zap)->zap_ptrtbl.zt_shift);
662 ASSERT3U(ZAP_HASH_IDX(hash, old_prefix_len), ==,
663 zap_leaf_phys(l)->l_hdr.lh_prefix);
664
665 prefix_diff = zap_f_phys(zap)->zap_ptrtbl.zt_shift -
666 (old_prefix_len + 1);
667 sibling = (ZAP_HASH_IDX(hash, old_prefix_len + 1) | 1) << prefix_diff;
668
669 /* check for i/o errors before doing zap_leaf_split */
670 for (i = 0; i < (1ULL<<prefix_diff); i++) {
671 uint64_t blk;
672 err = zap_idx_to_blk(zap, sibling+i, &blk);
673 if (err)
674 return (err);
675 ASSERT3U(blk, ==, l->l_blkid);
676 }
677
678 nl = zap_create_leaf(zap, tx);
679 zap_leaf_split(l, nl, zap->zap_normflags != 0);
680
681 /* set sibling pointers */
682 for (i = 0; i < (1ULL << prefix_diff); i++) {
683 err = zap_set_idx_to_blk(zap, sibling+i, nl->l_blkid, tx);
684 ASSERT0(err); /* we checked for i/o errors above */
685 }
686
687 if (hash & (1ULL << (64 - zap_leaf_phys(l)->l_hdr.lh_prefix_len))) {
688 /* we want the sibling */
689 zap_put_leaf(l);
690 *lp = nl;
691 } else {
692 zap_put_leaf(nl);
693 *lp = l;
694 }
695
696 return (0);
697 }
698
699 static void
700 zap_put_leaf_maybe_grow_ptrtbl(zap_name_t *zn, zap_leaf_t *l,
701 void *tag, dmu_tx_t *tx)
702 {
703 zap_t *zap = zn->zn_zap;
704 int shift = zap_f_phys(zap)->zap_ptrtbl.zt_shift;
705 int leaffull = (zap_leaf_phys(l)->l_hdr.lh_prefix_len == shift &&
706 zap_leaf_phys(l)->l_hdr.lh_nfree < ZAP_LEAF_LOW_WATER);
707
708 zap_put_leaf(l);
709
710 if (leaffull || zap_f_phys(zap)->zap_ptrtbl.zt_nextblk) {
711 int err;
712
713 /*
714 * We are in the middle of growing the pointer table, or
715 * this leaf will soon make us grow it.
716 */
717 if (zap_tryupgradedir(zap, tx) == 0) {
718 objset_t *os = zap->zap_objset;
719 uint64_t zapobj = zap->zap_object;
720
721 zap_unlockdir(zap, tag);
722 err = zap_lockdir(os, zapobj, tx,
723 RW_WRITER, FALSE, FALSE, tag, &zn->zn_zap);
724 zap = zn->zn_zap;
725 if (err)
726 return;
727 }
728
729 /* could have finished growing while our locks were down */
730 if (zap_f_phys(zap)->zap_ptrtbl.zt_shift == shift)
731 (void) zap_grow_ptrtbl(zap, tx);
732 }
733 }
734
735 static int
736 fzap_checkname(zap_name_t *zn)
737 {
738 if (zn->zn_key_orig_numints * zn->zn_key_intlen > ZAP_MAXNAMELEN)
739 return (SET_ERROR(ENAMETOOLONG));
740 return (0);
741 }
742
743 static int
744 fzap_checksize(uint64_t integer_size, uint64_t num_integers)
745 {
746 /* Only integer sizes supported by C */
747 switch (integer_size) {
748 case 1:
749 case 2:
750 case 4:
751 case 8:
752 break;
753 default:
754 return (SET_ERROR(EINVAL));
755 }
756
757 if (integer_size * num_integers > ZAP_MAXVALUELEN)
758 return (SET_ERROR(E2BIG));
759
760 return (0);
761 }
762
763 static int
764 fzap_check(zap_name_t *zn, uint64_t integer_size, uint64_t num_integers)
765 {
766 int err;
767
768 if ((err = fzap_checkname(zn)) != 0)
769 return (err);
770 return (fzap_checksize(integer_size, num_integers));
771 }
772
773 /*
774 * Routines for manipulating attributes.
775 */
776 int
777 fzap_lookup(zap_name_t *zn,
778 uint64_t integer_size, uint64_t num_integers, void *buf,
779 char *realname, int rn_len, boolean_t *ncp)
780 {
781 zap_leaf_t *l;
782 int err;
783 zap_entry_handle_t zeh;
784
785 if ((err = fzap_checkname(zn)) != 0)
786 return (err);
787
788 err = zap_deref_leaf(zn->zn_zap, zn->zn_hash, NULL, RW_READER, &l);
789 if (err != 0)
790 return (err);
791 err = zap_leaf_lookup(l, zn, &zeh);
792 if (err == 0) {
793 if ((err = fzap_checksize(integer_size, num_integers)) != 0) {
794 zap_put_leaf(l);
795 return (err);
796 }
797
798 err = zap_entry_read(&zeh, integer_size, num_integers, buf);
799 (void) zap_entry_read_name(zn->zn_zap, &zeh, rn_len, realname);
800 if (ncp) {
801 *ncp = zap_entry_normalization_conflict(&zeh,
802 zn, NULL, zn->zn_zap);
803 }
804 }
805
806 zap_put_leaf(l);
807 return (err);
808 }
809
810 int
811 fzap_add_cd(zap_name_t *zn,
812 uint64_t integer_size, uint64_t num_integers,
813 const void *val, uint32_t cd, void *tag, dmu_tx_t *tx)
814 {
815 zap_leaf_t *l;
816 int err;
817 zap_entry_handle_t zeh;
818 zap_t *zap = zn->zn_zap;
819
820 ASSERT(RW_LOCK_HELD(&zap->zap_rwlock));
821 ASSERT(!zap->zap_ismicro);
822 ASSERT(fzap_check(zn, integer_size, num_integers) == 0);
823
824 err = zap_deref_leaf(zap, zn->zn_hash, tx, RW_WRITER, &l);
825 if (err != 0)
826 return (err);
827 retry:
828 err = zap_leaf_lookup(l, zn, &zeh);
829 if (err == 0) {
830 err = SET_ERROR(EEXIST);
831 goto out;
832 }
833 if (err != ENOENT)
834 goto out;
835
836 err = zap_entry_create(l, zn, cd,
837 integer_size, num_integers, val, &zeh);
838
839 if (err == 0) {
840 zap_increment_num_entries(zap, 1, tx);
841 } else if (err == EAGAIN) {
842 err = zap_expand_leaf(zn, l, tag, tx, &l);
843 zap = zn->zn_zap; /* zap_expand_leaf() may change zap */
844 if (err == 0)
845 goto retry;
846 }
847
848 out:
849 if (zap != NULL)
850 zap_put_leaf_maybe_grow_ptrtbl(zn, l, tag, tx);
851 return (err);
852 }
853
854 int
855 fzap_add(zap_name_t *zn,
856 uint64_t integer_size, uint64_t num_integers,
857 const void *val, void *tag, dmu_tx_t *tx)
858 {
859 int err = fzap_check(zn, integer_size, num_integers);
860 if (err != 0)
861 return (err);
862
863 return (fzap_add_cd(zn, integer_size, num_integers,
864 val, ZAP_NEED_CD, tag, tx));
865 }
866
867 int
868 fzap_update(zap_name_t *zn,
869 int integer_size, uint64_t num_integers, const void *val,
870 void *tag, dmu_tx_t *tx)
871 {
872 zap_leaf_t *l;
873 int err, create;
874 zap_entry_handle_t zeh;
875 zap_t *zap = zn->zn_zap;
876
877 ASSERT(RW_LOCK_HELD(&zap->zap_rwlock));
878 err = fzap_check(zn, integer_size, num_integers);
879 if (err != 0)
880 return (err);
881
882 err = zap_deref_leaf(zap, zn->zn_hash, tx, RW_WRITER, &l);
883 if (err != 0)
884 return (err);
885 retry:
886 err = zap_leaf_lookup(l, zn, &zeh);
887 create = (err == ENOENT);
888 ASSERT(err == 0 || err == ENOENT);
889
890 if (create) {
891 err = zap_entry_create(l, zn, ZAP_NEED_CD,
892 integer_size, num_integers, val, &zeh);
893 if (err == 0)
894 zap_increment_num_entries(zap, 1, tx);
895 } else {
896 err = zap_entry_update(&zeh, integer_size, num_integers, val);
897 }
898
899 if (err == EAGAIN) {
900 err = zap_expand_leaf(zn, l, tag, tx, &l);
901 zap = zn->zn_zap; /* zap_expand_leaf() may change zap */
902 if (err == 0)
903 goto retry;
904 }
905
906 if (zap != NULL)
907 zap_put_leaf_maybe_grow_ptrtbl(zn, l, tag, tx);
908 return (err);
909 }
910
911 int
912 fzap_length(zap_name_t *zn,
913 uint64_t *integer_size, uint64_t *num_integers)
914 {
915 zap_leaf_t *l;
916 int err;
917 zap_entry_handle_t zeh;
918
919 err = zap_deref_leaf(zn->zn_zap, zn->zn_hash, NULL, RW_READER, &l);
920 if (err != 0)
921 return (err);
922 err = zap_leaf_lookup(l, zn, &zeh);
923 if (err != 0)
924 goto out;
925
926 if (integer_size)
927 *integer_size = zeh.zeh_integer_size;
928 if (num_integers)
929 *num_integers = zeh.zeh_num_integers;
930 out:
931 zap_put_leaf(l);
932 return (err);
933 }
934
935 int
936 fzap_remove(zap_name_t *zn, dmu_tx_t *tx)
937 {
938 zap_leaf_t *l;
939 int err;
940 zap_entry_handle_t zeh;
941
942 err = zap_deref_leaf(zn->zn_zap, zn->zn_hash, tx, RW_WRITER, &l);
943 if (err != 0)
944 return (err);
945 err = zap_leaf_lookup(l, zn, &zeh);
946 if (err == 0) {
947 zap_entry_remove(&zeh);
948 zap_increment_num_entries(zn->zn_zap, -1, tx);
949 }
950 zap_put_leaf(l);
951 return (err);
952 }
953
954 void
955 fzap_prefetch(zap_name_t *zn)
956 {
957 uint64_t idx, blk;
958 zap_t *zap = zn->zn_zap;
959 int bs;
960
961 idx = ZAP_HASH_IDX(zn->zn_hash,
962 zap_f_phys(zap)->zap_ptrtbl.zt_shift);
963 if (zap_idx_to_blk(zap, idx, &blk) != 0)
964 return;
965 bs = FZAP_BLOCK_SHIFT(zap);
966 dmu_prefetch(zap->zap_objset, zap->zap_object, 0, blk << bs, 1 << bs,
967 ZIO_PRIORITY_SYNC_READ);
968 }
969
970 /*
971 * Helper functions for consumers.
972 */
973
974 uint64_t
975 zap_create_link(objset_t *os, dmu_object_type_t ot, uint64_t parent_obj,
976 const char *name, dmu_tx_t *tx)
977 {
978 uint64_t new_obj;
979
980 VERIFY((new_obj = zap_create(os, ot, DMU_OT_NONE, 0, tx)) > 0);
981 VERIFY0(zap_add(os, parent_obj, name, sizeof (uint64_t), 1, &new_obj,
982 tx));
983
984 return (new_obj);
985 }
986
987 int
988 zap_value_search(objset_t *os, uint64_t zapobj, uint64_t value, uint64_t mask,
989 char *name)
990 {
991 zap_cursor_t zc;
992 zap_attribute_t *za;
993 int err;
994
995 if (mask == 0)
996 mask = -1ULL;
997
998 za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
999 for (zap_cursor_init(&zc, os, zapobj);
1000 (err = zap_cursor_retrieve(&zc, za)) == 0;
1001 zap_cursor_advance(&zc)) {
1002 if ((za->za_first_integer & mask) == (value & mask)) {
1003 (void) strcpy(name, za->za_name);
1004 break;
1005 }
1006 }
1007 zap_cursor_fini(&zc);
1008 kmem_free(za, sizeof (zap_attribute_t));
1009 return (err);
1010 }
1011
1012 int
1013 zap_join(objset_t *os, uint64_t fromobj, uint64_t intoobj, dmu_tx_t *tx)
1014 {
1015 zap_cursor_t zc;
1016 zap_attribute_t za;
1017 int err;
1018
1019 err = 0;
1020 for (zap_cursor_init(&zc, os, fromobj);
1021 zap_cursor_retrieve(&zc, &za) == 0;
1022 (void) zap_cursor_advance(&zc)) {
1023 if (za.za_integer_length != 8 || za.za_num_integers != 1) {
1024 err = SET_ERROR(EINVAL);
1025 break;
1026 }
1027 err = zap_add(os, intoobj, za.za_name,
1028 8, 1, &za.za_first_integer, tx);
1029 if (err)
1030 break;
1031 }
1032 zap_cursor_fini(&zc);
1033 return (err);
1034 }
1035
1036 int
1037 zap_join_key(objset_t *os, uint64_t fromobj, uint64_t intoobj,
1038 uint64_t value, dmu_tx_t *tx, boolean_t exists_ok)
1039 {
1040 zap_cursor_t zc;
1041 zap_attribute_t za;
1042 int err;
1043
1044 err = 0;
1045 for (zap_cursor_init(&zc, os, fromobj);
1046 zap_cursor_retrieve(&zc, &za) == 0;
1047 (void) zap_cursor_advance(&zc)) {
1048 if (za.za_integer_length != 8 || za.za_num_integers != 1) {
1049 err = SET_ERROR(EINVAL);
1050 break;
1051 }
1052 err = zap_add(os, intoobj, za.za_name,
1053 8, 1, &value, tx);
1054 if (err != 0) {
1055 if (err == EEXIST && exists_ok)
1056 err = 0;
1057 else
1058 break;
1059 }
1060 }
1061 zap_cursor_fini(&zc);
1062 return (err);
1063 }
1064
1065 int
1066 zap_join_increment(objset_t *os, uint64_t fromobj, uint64_t intoobj,
1067 dmu_tx_t *tx)
1068 {
1069 zap_cursor_t zc;
1070 zap_attribute_t za;
1071 int err;
1072
1073 err = 0;
1074 for (zap_cursor_init(&zc, os, fromobj);
1075 zap_cursor_retrieve(&zc, &za) == 0;
1076 (void) zap_cursor_advance(&zc)) {
1077 uint64_t delta = 0;
1078
1079 if (za.za_integer_length != 8 || za.za_num_integers != 1) {
1080 err = SET_ERROR(EINVAL);
1081 break;
1082 }
1083
1084 err = zap_lookup(os, intoobj, za.za_name, 8, 1, &delta);
1085 if (err != 0 && err != ENOENT)
1086 break;
1087 delta += za.za_first_integer;
1088 err = zap_update(os, intoobj, za.za_name, 8, 1, &delta, tx);
1089 if (err)
1090 break;
1091 }
1092 zap_cursor_fini(&zc);
1093 return (err);
1094 }
1095
1096 int
1097 zap_add_int(objset_t *os, uint64_t obj, uint64_t value, dmu_tx_t *tx)
1098 {
1099 char name[20];
1100
1101 (void) snprintf(name, sizeof (name), "%llx", (longlong_t)value);
1102 return (zap_add(os, obj, name, 8, 1, &value, tx));
1103 }
1104
1105 int
1106 zap_remove_int(objset_t *os, uint64_t obj, uint64_t value, dmu_tx_t *tx)
1107 {
1108 char name[20];
1109
1110 (void) snprintf(name, sizeof (name), "%llx", (longlong_t)value);
1111 return (zap_remove(os, obj, name, tx));
1112 }
1113
1114 int
1115 zap_lookup_int(objset_t *os, uint64_t obj, uint64_t value)
1116 {
1117 char name[20];
1118
1119 (void) snprintf(name, sizeof (name), "%llx", (longlong_t)value);
1120 return (zap_lookup(os, obj, name, 8, 1, &value));
1121 }
1122
1123 int
1124 zap_add_int_key(objset_t *os, uint64_t obj,
1125 uint64_t key, uint64_t value, dmu_tx_t *tx)
1126 {
1127 char name[20];
1128
1129 (void) snprintf(name, sizeof (name), "%llx", (longlong_t)key);
1130 return (zap_add(os, obj, name, 8, 1, &value, tx));
1131 }
1132
1133 int
1134 zap_update_int_key(objset_t *os, uint64_t obj,
1135 uint64_t key, uint64_t value, dmu_tx_t *tx)
1136 {
1137 char name[20];
1138
1139 (void) snprintf(name, sizeof (name), "%llx", (longlong_t)key);
1140 return (zap_update(os, obj, name, 8, 1, &value, tx));
1141 }
1142
1143 int
1144 zap_lookup_int_key(objset_t *os, uint64_t obj, uint64_t key, uint64_t *valuep)
1145 {
1146 char name[20];
1147
1148 (void) snprintf(name, sizeof (name), "%llx", (longlong_t)key);
1149 return (zap_lookup(os, obj, name, 8, 1, valuep));
1150 }
1151
1152 int
1153 zap_increment(objset_t *os, uint64_t obj, const char *name, int64_t delta,
1154 dmu_tx_t *tx)
1155 {
1156 uint64_t value = 0;
1157 int err;
1158
1159 if (delta == 0)
1160 return (0);
1161
1162 err = zap_lookup(os, obj, name, 8, 1, &value);
1163 if (err != 0 && err != ENOENT)
1164 return (err);
1165 value += delta;
1166 if (value == 0)
1167 err = zap_remove(os, obj, name, tx);
1168 else
1169 err = zap_update(os, obj, name, 8, 1, &value, tx);
1170 return (err);
1171 }
1172
1173 int
1174 zap_increment_int(objset_t *os, uint64_t obj, uint64_t key, int64_t delta,
1175 dmu_tx_t *tx)
1176 {
1177 char name[20];
1178
1179 (void) snprintf(name, sizeof (name), "%llx", (longlong_t)key);
1180 return (zap_increment(os, obj, name, delta, tx));
1181 }
1182
1183 /*
1184 * Routines for iterating over the attributes.
1185 */
1186
1187 int
1188 fzap_cursor_retrieve(zap_t *zap, zap_cursor_t *zc, zap_attribute_t *za)
1189 {
1190 int err = ENOENT;
1191 zap_entry_handle_t zeh;
1192 zap_leaf_t *l;
1193
1194 /* retrieve the next entry at or after zc_hash/zc_cd */
1195 /* if no entry, return ENOENT */
1196
1197 if (zc->zc_leaf &&
1198 (ZAP_HASH_IDX(zc->zc_hash,
1199 zap_leaf_phys(zc->zc_leaf)->l_hdr.lh_prefix_len) !=
1200 zap_leaf_phys(zc->zc_leaf)->l_hdr.lh_prefix)) {
1201 rw_enter(&zc->zc_leaf->l_rwlock, RW_READER);
1202 zap_put_leaf(zc->zc_leaf);
1203 zc->zc_leaf = NULL;
1204 }
1205
1206 again:
1207 if (zc->zc_leaf == NULL) {
1208 err = zap_deref_leaf(zap, zc->zc_hash, NULL, RW_READER,
1209 &zc->zc_leaf);
1210 if (err != 0)
1211 return (err);
1212 } else {
1213 rw_enter(&zc->zc_leaf->l_rwlock, RW_READER);
1214 }
1215 l = zc->zc_leaf;
1216
1217 err = zap_leaf_lookup_closest(l, zc->zc_hash, zc->zc_cd, &zeh);
1218
1219 if (err == ENOENT) {
1220 uint64_t nocare =
1221 (1ULL << (64 - zap_leaf_phys(l)->l_hdr.lh_prefix_len)) - 1;
1222 zc->zc_hash = (zc->zc_hash & ~nocare) + nocare + 1;
1223 zc->zc_cd = 0;
1224 if (zap_leaf_phys(l)->l_hdr.lh_prefix_len == 0 ||
1225 zc->zc_hash == 0) {
1226 zc->zc_hash = -1ULL;
1227 } else {
1228 zap_put_leaf(zc->zc_leaf);
1229 zc->zc_leaf = NULL;
1230 goto again;
1231 }
1232 }
1233
1234 if (err == 0) {
1235 zc->zc_hash = zeh.zeh_hash;
1236 zc->zc_cd = zeh.zeh_cd;
1237 za->za_integer_length = zeh.zeh_integer_size;
1238 za->za_num_integers = zeh.zeh_num_integers;
1239 if (zeh.zeh_num_integers == 0) {
1240 za->za_first_integer = 0;
1241 } else {
1242 err = zap_entry_read(&zeh, 8, 1, &za->za_first_integer);
1243 ASSERT(err == 0 || err == EOVERFLOW);
1244 }
1245 err = zap_entry_read_name(zap, &zeh,
1246 sizeof (za->za_name), za->za_name);
1247 ASSERT(err == 0);
1248
1249 za->za_normalization_conflict =
1250 zap_entry_normalization_conflict(&zeh,
1251 NULL, za->za_name, zap);
1252 }
1253 rw_exit(&zc->zc_leaf->l_rwlock);
1254 return (err);
1255 }
1256
1257 static void
1258 zap_stats_ptrtbl(zap_t *zap, uint64_t *tbl, int len, zap_stats_t *zs)
1259 {
1260 int i, err;
1261 uint64_t lastblk = 0;
1262
1263 /*
1264 * NB: if a leaf has more pointers than an entire ptrtbl block
1265 * can hold, then it'll be accounted for more than once, since
1266 * we won't have lastblk.
1267 */
1268 for (i = 0; i < len; i++) {
1269 zap_leaf_t *l;
1270
1271 if (tbl[i] == lastblk)
1272 continue;
1273 lastblk = tbl[i];
1274
1275 err = zap_get_leaf_byblk(zap, tbl[i], NULL, RW_READER, &l);
1276 if (err == 0) {
1277 zap_leaf_stats(zap, l, zs);
1278 zap_put_leaf(l);
1279 }
1280 }
1281 }
1282
1283 void
1284 fzap_get_stats(zap_t *zap, zap_stats_t *zs)
1285 {
1286 int bs = FZAP_BLOCK_SHIFT(zap);
1287 zs->zs_blocksize = 1ULL << bs;
1288
1289 /*
1290 * Set zap_phys_t fields
1291 */
1292 zs->zs_num_leafs = zap_f_phys(zap)->zap_num_leafs;
1293 zs->zs_num_entries = zap_f_phys(zap)->zap_num_entries;
1294 zs->zs_num_blocks = zap_f_phys(zap)->zap_freeblk;
1295 zs->zs_block_type = zap_f_phys(zap)->zap_block_type;
1296 zs->zs_magic = zap_f_phys(zap)->zap_magic;
1297 zs->zs_salt = zap_f_phys(zap)->zap_salt;
1298
1299 /*
1300 * Set zap_ptrtbl fields
1301 */
1302 zs->zs_ptrtbl_len = 1ULL << zap_f_phys(zap)->zap_ptrtbl.zt_shift;
1303 zs->zs_ptrtbl_nextblk = zap_f_phys(zap)->zap_ptrtbl.zt_nextblk;
1304 zs->zs_ptrtbl_blks_copied =
1305 zap_f_phys(zap)->zap_ptrtbl.zt_blks_copied;
1306 zs->zs_ptrtbl_zt_blk = zap_f_phys(zap)->zap_ptrtbl.zt_blk;
1307 zs->zs_ptrtbl_zt_numblks = zap_f_phys(zap)->zap_ptrtbl.zt_numblks;
1308 zs->zs_ptrtbl_zt_shift = zap_f_phys(zap)->zap_ptrtbl.zt_shift;
1309
1310 if (zap_f_phys(zap)->zap_ptrtbl.zt_numblks == 0) {
1311 /* the ptrtbl is entirely in the header block. */
1312 zap_stats_ptrtbl(zap, &ZAP_EMBEDDED_PTRTBL_ENT(zap, 0),
1313 1 << ZAP_EMBEDDED_PTRTBL_SHIFT(zap), zs);
1314 } else {
1315 int b;
1316
1317 dmu_prefetch(zap->zap_objset, zap->zap_object, 0,
1318 zap_f_phys(zap)->zap_ptrtbl.zt_blk << bs,
1319 zap_f_phys(zap)->zap_ptrtbl.zt_numblks << bs,
1320 ZIO_PRIORITY_SYNC_READ);
1321
1322 for (b = 0; b < zap_f_phys(zap)->zap_ptrtbl.zt_numblks;
1323 b++) {
1324 dmu_buf_t *db;
1325 int err;
1326
1327 err = dmu_buf_hold(zap->zap_objset, zap->zap_object,
1328 (zap_f_phys(zap)->zap_ptrtbl.zt_blk + b) << bs,
1329 FTAG, &db, DMU_READ_NO_PREFETCH);
1330 if (err == 0) {
1331 zap_stats_ptrtbl(zap, db->db_data,
1332 1<<(bs-3), zs);
1333 dmu_buf_rele(db, FTAG);
1334 }
1335 }
1336 }
1337 }