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 by Delphix. All rights reserved.
24 */
25
26/*
27 * This file contains the top half of the zfs directory structure
28 * implementation. The bottom half is in zap_leaf.c.
29 *
30 * The zdir is an extendable hash data structure. There is a table of
31 * pointers to buckets (zap_t->zd_data->zd_leafs). The buckets are
32 * each a constant size and hold a variable number of directory entries.
33 * The buckets (aka "leaf nodes") are implemented in zap_leaf.c.
34 *
35 * The pointer table holds a power of 2 number of pointers.
36 * (1<<zap_t->zd_data->zd_phys->zd_prefix_len). The bucket pointed to
37 * by the pointer at index i in the table holds entries whose hash value
38 * has a zd_prefix_len - bit prefix
39 */
40
41#include <sys/spa.h>
42#include <sys/dmu.h>
43#include <sys/zfs_context.h>
44#include <sys/zfs_znode.h>
45#include <sys/fs/zfs.h>
46#include <sys/zap.h>
47#include <sys/refcount.h>
48#include <sys/zap_impl.h>
49#include <sys/zap_leaf.h>
50
51int fzap_default_block_shift = 14; /* 16k blocksize */
52
53static void zap_leaf_pageout(dmu_buf_t *db, void *vl);
54static uint64_t zap_allocate_blocks(zap_t *zap, int nblocks);
55
56
57void
58fzap_byteswap(void *vbuf, size_t size)
59{
60 uint64_t block_type;
61
62 block_type = *(uint64_t *)vbuf;
63
64 if (block_type == ZBT_LEAF || block_type == BSWAP_64(ZBT_LEAF))
65 zap_leaf_byteswap(vbuf, size);
66 else {
67 /* it's a ptrtbl block */
68 byteswap_uint64_array(vbuf, size);
69 }
70}
71
72void
73fzap_upgrade(zap_t *zap, dmu_tx_t *tx, zap_flags_t flags)
74{
75 dmu_buf_t *db;
76 zap_leaf_t *l;
77 int i;
78 zap_phys_t *zp;
79
80 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
81 zap->zap_ismicro = FALSE;
82
83 (void) dmu_buf_update_user(zap->zap_dbuf, zap, zap,
84 &zap->zap_f.zap_phys, zap_evict);
85
86 mutex_init(&zap->zap_f.zap_num_entries_mtx, 0, 0, 0);
87 zap->zap_f.zap_block_shift = highbit(zap->zap_dbuf->db_size) - 1;
88
89 zp = zap->zap_f.zap_phys;
90 /*
91 * explicitly zero it since it might be coming from an
92 * initialized microzap
93 */
94 bzero(zap->zap_dbuf->db_data, zap->zap_dbuf->db_size);
95 zp->zap_block_type = ZBT_HEADER;
96 zp->zap_magic = ZAP_MAGIC;
97
98 zp->zap_ptrtbl.zt_shift = ZAP_EMBEDDED_PTRTBL_SHIFT(zap);
99
100 zp->zap_freeblk = 2; /* block 1 will be the first leaf */
101 zp->zap_num_leafs = 1;
102 zp->zap_num_entries = 0;
103 zp->zap_salt = zap->zap_salt;
104 zp->zap_normflags = zap->zap_normflags;
105 zp->zap_flags = flags;
106
107 /* block 1 will be the first leaf */
108 for (i = 0; i < (1<<zp->zap_ptrtbl.zt_shift); i++)
109 ZAP_EMBEDDED_PTRTBL_ENT(zap, i) = 1;
110
111 /*
112 * set up block 1 - the first leaf
113 */
114 VERIFY(0 == dmu_buf_hold(zap->zap_objset, zap->zap_object,
115 1<<FZAP_BLOCK_SHIFT(zap), FTAG, &db, DMU_READ_NO_PREFETCH));
116 dmu_buf_will_dirty(db, tx);
117
118 l = kmem_zalloc(sizeof (zap_leaf_t), KM_SLEEP);
119 l->l_dbuf = db;
120 l->l_phys = db->db_data;
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
128static int
129zap_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
144static int
145zap_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,
167 tbl->zt_blk << bs, tbl->zt_numblks << bs);
168 }
169
170 /*
171 * Copy the ptrtbl from the old to new location.
172 */
173
174 b = tbl->zt_blks_copied;
175 err = dmu_buf_hold(zap->zap_objset, zap->zap_object,
176 (tbl->zt_blk + b) << bs, FTAG, &db_old, DMU_READ_NO_PREFETCH);
177 if (err)
178 return (err);
179
180 /* first half of entries in old[b] go to new[2*b+0] */
181 VERIFY(0 == dmu_buf_hold(zap->zap_objset, zap->zap_object,
182 (newblk + 2*b+0) << bs, FTAG, &db_new, DMU_READ_NO_PREFETCH));
183 dmu_buf_will_dirty(db_new, tx);
184 transfer_func(db_old->db_data, db_new->db_data, hepb);
185 dmu_buf_rele(db_new, FTAG);
186
187 /* second half of entries in old[b] go to new[2*b+1] */
188 VERIFY(0 == dmu_buf_hold(zap->zap_objset, zap->zap_object,
189 (newblk + 2*b+1) << bs, FTAG, &db_new, DMU_READ_NO_PREFETCH));
190 dmu_buf_will_dirty(db_new, tx);
191 transfer_func((uint64_t *)db_old->db_data + hepb,
192 db_new->db_data, hepb);
193 dmu_buf_rele(db_new, FTAG);
194
195 dmu_buf_rele(db_old, FTAG);
196
197 tbl->zt_blks_copied++;
198
199 dprintf("copied block %llu of %llu\n",
200 tbl->zt_blks_copied, tbl->zt_numblks);
201
202 if (tbl->zt_blks_copied == tbl->zt_numblks) {
203 (void) dmu_free_range(zap->zap_objset, zap->zap_object,
204 tbl->zt_blk << bs, tbl->zt_numblks << bs, tx);
205
206 tbl->zt_blk = newblk;
207 tbl->zt_numblks *= 2;
208 tbl->zt_shift++;
209 tbl->zt_nextblk = 0;
210 tbl->zt_blks_copied = 0;
211
212 dprintf("finished; numblocks now %llu (%lluk entries)\n",
213 tbl->zt_numblks, 1<<(tbl->zt_shift-10));
214 }
215
216 return (0);
217}
218
219static int
220zap_table_store(zap_t *zap, zap_table_phys_t *tbl, uint64_t idx, uint64_t val,
221 dmu_tx_t *tx)
222{
223 int err;
224 uint64_t blk, off;
225 int bs = FZAP_BLOCK_SHIFT(zap);
226 dmu_buf_t *db;
227
228 ASSERT(RW_LOCK_HELD(&zap->zap_rwlock));
229 ASSERT(tbl->zt_blk != 0);
230
231 dprintf("storing %llx at index %llx\n", val, idx);
232
233 blk = idx >> (bs-3);
234 off = idx & ((1<<(bs-3))-1);
235
236 err = dmu_buf_hold(zap->zap_objset, zap->zap_object,
237 (tbl->zt_blk + blk) << bs, FTAG, &db, DMU_READ_NO_PREFETCH);
238 if (err)
239 return (err);
240 dmu_buf_will_dirty(db, tx);
241
242 if (tbl->zt_nextblk != 0) {
243 uint64_t idx2 = idx * 2;
244 uint64_t blk2 = idx2 >> (bs-3);
245 uint64_t off2 = idx2 & ((1<<(bs-3))-1);
246 dmu_buf_t *db2;
247
248 err = dmu_buf_hold(zap->zap_objset, zap->zap_object,
249 (tbl->zt_nextblk + blk2) << bs, FTAG, &db2,
250 DMU_READ_NO_PREFETCH);
251 if (err) {
252 dmu_buf_rele(db, FTAG);
253 return (err);
254 }
255 dmu_buf_will_dirty(db2, tx);
256 ((uint64_t *)db2->db_data)[off2] = val;
257 ((uint64_t *)db2->db_data)[off2+1] = val;
258 dmu_buf_rele(db2, FTAG);
259 }
260
261 ((uint64_t *)db->db_data)[off] = val;
262 dmu_buf_rele(db, FTAG);
263
264 return (0);
265}
266
267static int
268zap_table_load(zap_t *zap, zap_table_phys_t *tbl, uint64_t idx, uint64_t *valp)
269{
270 uint64_t blk, off;
271 int err;
272 dmu_buf_t *db;
273 int bs = FZAP_BLOCK_SHIFT(zap);
274
275 ASSERT(RW_LOCK_HELD(&zap->zap_rwlock));
276
277 blk = idx >> (bs-3);
278 off = idx & ((1<<(bs-3))-1);
279
280 err = dmu_buf_hold(zap->zap_objset, zap->zap_object,
281 (tbl->zt_blk + blk) << bs, FTAG, &db, DMU_READ_NO_PREFETCH);
282 if (err)
283 return (err);
284 *valp = ((uint64_t *)db->db_data)[off];
285 dmu_buf_rele(db, FTAG);
286
287 if (tbl->zt_nextblk != 0) {
288 /*
289 * read the nextblk for the sake of i/o error checking,
290 * so that zap_table_load() will catch errors for
291 * zap_table_store.
292 */
293 blk = (idx*2) >> (bs-3);
294
295 err = dmu_buf_hold(zap->zap_objset, zap->zap_object,
296 (tbl->zt_nextblk + blk) << bs, FTAG, &db,
297 DMU_READ_NO_PREFETCH);
298 dmu_buf_rele(db, FTAG);
299 }
300 return (err);
301}
302
303/*
304 * Routines for growing the ptrtbl.
305 */
306
307static void
308zap_ptrtbl_transfer(const uint64_t *src, uint64_t *dst, int n)
309{
310 int i;
311 for (i = 0; i < n; i++) {
312 uint64_t lb = src[i];
313 dst[2*i+0] = lb;
314 dst[2*i+1] = lb;
315 }
316}
317
318static int
319zap_grow_ptrtbl(zap_t *zap, dmu_tx_t *tx)
320{
321 /*
322 * The pointer table should never use more hash bits than we
323 * have (otherwise we'd be using useless zero bits to index it).
324 * If we are within 2 bits of running out, stop growing, since
325 * this is already an aberrant condition.
326 */
327 if (zap->zap_f.zap_phys->zap_ptrtbl.zt_shift >= zap_hashbits(zap) - 2)
328 return (ENOSPC);
329
330 if (zap->zap_f.zap_phys->zap_ptrtbl.zt_numblks == 0) {
331 /*
332 * We are outgrowing the "embedded" ptrtbl (the one
333 * stored in the header block). Give it its own entire
334 * block, which will double the size of the ptrtbl.
335 */
336 uint64_t newblk;
337 dmu_buf_t *db_new;
338 int err;
339
340 ASSERT3U(zap->zap_f.zap_phys->zap_ptrtbl.zt_shift, ==,
341 ZAP_EMBEDDED_PTRTBL_SHIFT(zap));
342 ASSERT0(zap->zap_f.zap_phys->zap_ptrtbl.zt_blk);
343
344 newblk = zap_allocate_blocks(zap, 1);
345 err = dmu_buf_hold(zap->zap_objset, zap->zap_object,
346 newblk << FZAP_BLOCK_SHIFT(zap), FTAG, &db_new,
347 DMU_READ_NO_PREFETCH);
348 if (err)
349 return (err);
350 dmu_buf_will_dirty(db_new, tx);
351 zap_ptrtbl_transfer(&ZAP_EMBEDDED_PTRTBL_ENT(zap, 0),
352 db_new->db_data, 1 << ZAP_EMBEDDED_PTRTBL_SHIFT(zap));
353 dmu_buf_rele(db_new, FTAG);
354
355 zap->zap_f.zap_phys->zap_ptrtbl.zt_blk = newblk;
356 zap->zap_f.zap_phys->zap_ptrtbl.zt_numblks = 1;
357 zap->zap_f.zap_phys->zap_ptrtbl.zt_shift++;
358
359 ASSERT3U(1ULL << zap->zap_f.zap_phys->zap_ptrtbl.zt_shift, ==,
360 zap->zap_f.zap_phys->zap_ptrtbl.zt_numblks <<
361 (FZAP_BLOCK_SHIFT(zap)-3));
362
363 return (0);
364 } else {
365 return (zap_table_grow(zap, &zap->zap_f.zap_phys->zap_ptrtbl,
366 zap_ptrtbl_transfer, tx));
367 }
368}
369
370static void
371zap_increment_num_entries(zap_t *zap, int delta, dmu_tx_t *tx)
372{
373 dmu_buf_will_dirty(zap->zap_dbuf, tx);
374 mutex_enter(&zap->zap_f.zap_num_entries_mtx);
375 ASSERT(delta > 0 || zap->zap_f.zap_phys->zap_num_entries >= -delta);
376 zap->zap_f.zap_phys->zap_num_entries += delta;
377 mutex_exit(&zap->zap_f.zap_num_entries_mtx);
378}
379
380static uint64_t
381zap_allocate_blocks(zap_t *zap, int nblocks)
382{
383 uint64_t newblk;
384 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
385 newblk = zap->zap_f.zap_phys->zap_freeblk;
386 zap->zap_f.zap_phys->zap_freeblk += nblocks;
387 return (newblk);
388}
389
390static zap_leaf_t *
391zap_create_leaf(zap_t *zap, dmu_tx_t *tx)
392{
393 void *winner;
394 zap_leaf_t *l = kmem_alloc(sizeof (zap_leaf_t), KM_SLEEP);
395
396 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
397
398 rw_init(&l->l_rwlock, 0, 0, 0);
399 rw_enter(&l->l_rwlock, RW_WRITER);
400 l->l_blkid = zap_allocate_blocks(zap, 1);
401 l->l_dbuf = NULL;
402 l->l_phys = NULL;
403
404 VERIFY(0 == dmu_buf_hold(zap->zap_objset, zap->zap_object,
405 l->l_blkid << FZAP_BLOCK_SHIFT(zap), NULL, &l->l_dbuf,
406 DMU_READ_NO_PREFETCH));
407 winner = dmu_buf_set_user(l->l_dbuf, l, &l->l_phys, zap_leaf_pageout);
408 ASSERT(winner == NULL);
409 dmu_buf_will_dirty(l->l_dbuf, tx);
410
411 zap_leaf_init(l, zap->zap_normflags != 0);
412
413 zap->zap_f.zap_phys->zap_num_leafs++;
414
415 return (l);
416}
417
418int
419fzap_count(zap_t *zap, uint64_t *count)
420{
421 ASSERT(!zap->zap_ismicro);
422 mutex_enter(&zap->zap_f.zap_num_entries_mtx); /* unnecessary */
423 *count = zap->zap_f.zap_phys->zap_num_entries;
424 mutex_exit(&zap->zap_f.zap_num_entries_mtx);
425 return (0);
426}
427
428/*
429 * Routines for obtaining zap_leaf_t's
430 */
431
432void
433zap_put_leaf(zap_leaf_t *l)
434{
435 rw_exit(&l->l_rwlock);
436 dmu_buf_rele(l->l_dbuf, NULL);
437}
438
439_NOTE(ARGSUSED(0))
440static void
441zap_leaf_pageout(dmu_buf_t *db, void *vl)
442{
443 zap_leaf_t *l = vl;
444
445 rw_destroy(&l->l_rwlock);
446 kmem_free(l, sizeof (zap_leaf_t));
447}
448
449static zap_leaf_t *
450zap_open_leaf(uint64_t blkid, dmu_buf_t *db)
451{
452 zap_leaf_t *l, *winner;
453
454 ASSERT(blkid != 0);
455
456 l = kmem_alloc(sizeof (zap_leaf_t), KM_SLEEP);
457 rw_init(&l->l_rwlock, 0, 0, 0);
458 rw_enter(&l->l_rwlock, RW_WRITER);
459 l->l_blkid = blkid;
460 l->l_bs = highbit(db->db_size)-1;
461 l->l_dbuf = db;
462 l->l_phys = NULL;
463
464 winner = dmu_buf_set_user(db, l, &l->l_phys, zap_leaf_pageout);
465
466 rw_exit(&l->l_rwlock);
467 if (winner != NULL) {
468 /* someone else set it first */
469 zap_leaf_pageout(NULL, l);
470 l = winner;
471 }
472
473 /*
474 * lhr_pad was previously used for the next leaf in the leaf
475 * chain. There should be no chained leafs (as we have removed
476 * support for them).
477 */
478 ASSERT0(l->l_phys->l_hdr.lh_pad1);
479
480 /*
481 * There should be more hash entries than there can be
482 * chunks to put in the hash table
483 */
484 ASSERT3U(ZAP_LEAF_HASH_NUMENTRIES(l), >, ZAP_LEAF_NUMCHUNKS(l) / 3);
485
486 /* The chunks should begin at the end of the hash table */
487 ASSERT3P(&ZAP_LEAF_CHUNK(l, 0), ==,
488 &l->l_phys->l_hash[ZAP_LEAF_HASH_NUMENTRIES(l)]);
489
490 /* The chunks should end at the end of the block */
491 ASSERT3U((uintptr_t)&ZAP_LEAF_CHUNK(l, ZAP_LEAF_NUMCHUNKS(l)) -
492 (uintptr_t)l->l_phys, ==, l->l_dbuf->db_size);
493
494 return (l);
495}
496
497static int
498zap_get_leaf_byblk(zap_t *zap, uint64_t blkid, dmu_tx_t *tx, krw_t lt,
499 zap_leaf_t **lp)
500{
501 dmu_buf_t *db;
502 zap_leaf_t *l;
503 int bs = FZAP_BLOCK_SHIFT(zap);
504 int err;
505
506 ASSERT(RW_LOCK_HELD(&zap->zap_rwlock));
507
508 err = dmu_buf_hold(zap->zap_objset, zap->zap_object,
509 blkid << bs, NULL, &db, DMU_READ_NO_PREFETCH);
510 if (err)
511 return (err);
512
513 ASSERT3U(db->db_object, ==, zap->zap_object);
514 ASSERT3U(db->db_offset, ==, blkid << bs);
515 ASSERT3U(db->db_size, ==, 1 << bs);
516 ASSERT(blkid != 0);
517
518 l = dmu_buf_get_user(db);
519
520 if (l == NULL)
521 l = zap_open_leaf(blkid, db);
522
523 rw_enter(&l->l_rwlock, lt);
524 /*
525 * Must lock before dirtying, otherwise l->l_phys could change,
526 * causing ASSERT below to fail.
527 */
528 if (lt == RW_WRITER)
529 dmu_buf_will_dirty(db, tx);
530 ASSERT3U(l->l_blkid, ==, blkid);
531 ASSERT3P(l->l_dbuf, ==, db);
532 ASSERT3P(l->l_phys, ==, l->l_dbuf->db_data);
533 ASSERT3U(l->l_phys->l_hdr.lh_block_type, ==, ZBT_LEAF);
534 ASSERT3U(l->l_phys->l_hdr.lh_magic, ==, ZAP_LEAF_MAGIC);
535
536 *lp = l;
537 return (0);
538}
539
540static int
541zap_idx_to_blk(zap_t *zap, uint64_t idx, uint64_t *valp)
542{
543 ASSERT(RW_LOCK_HELD(&zap->zap_rwlock));
544
545 if (zap->zap_f.zap_phys->zap_ptrtbl.zt_numblks == 0) {
546 ASSERT3U(idx, <,
547 (1ULL << zap->zap_f.zap_phys->zap_ptrtbl.zt_shift));
548 *valp = ZAP_EMBEDDED_PTRTBL_ENT(zap, idx);
549 return (0);
550 } else {
551 return (zap_table_load(zap, &zap->zap_f.zap_phys->zap_ptrtbl,
552 idx, valp));
553 }
554}
555
556static int
557zap_set_idx_to_blk(zap_t *zap, uint64_t idx, uint64_t blk, dmu_tx_t *tx)
558{
559 ASSERT(tx != NULL);
560 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
561
562 if (zap->zap_f.zap_phys->zap_ptrtbl.zt_blk == 0) {
563 ZAP_EMBEDDED_PTRTBL_ENT(zap, idx) = blk;
564 return (0);
565 } else {
566 return (zap_table_store(zap, &zap->zap_f.zap_phys->zap_ptrtbl,
567 idx, blk, tx));
568 }
569}
570
571static int
572zap_deref_leaf(zap_t *zap, uint64_t h, dmu_tx_t *tx, krw_t lt, zap_leaf_t **lp)
573{
574 uint64_t idx, blk;
575 int err;
576
577 ASSERT(zap->zap_dbuf == NULL ||
578 zap->zap_f.zap_phys == zap->zap_dbuf->db_data);
579 ASSERT3U(zap->zap_f.zap_phys->zap_magic, ==, ZAP_MAGIC);
580 idx = ZAP_HASH_IDX(h, zap->zap_f.zap_phys->zap_ptrtbl.zt_shift);
581 err = zap_idx_to_blk(zap, idx, &blk);
582 if (err != 0)
583 return (err);
584 err = zap_get_leaf_byblk(zap, blk, tx, lt, lp);
585
586 ASSERT(err || ZAP_HASH_IDX(h, (*lp)->l_phys->l_hdr.lh_prefix_len) ==
587 (*lp)->l_phys->l_hdr.lh_prefix);
588 return (err);
589}
590
591static int
592zap_expand_leaf(zap_name_t *zn, zap_leaf_t *l, dmu_tx_t *tx, zap_leaf_t **lp)
593{
594 zap_t *zap = zn->zn_zap;
595 uint64_t hash = zn->zn_hash;
596 zap_leaf_t *nl;
597 int prefix_diff, i, err;
598 uint64_t sibling;
599 int old_prefix_len = l->l_phys->l_hdr.lh_prefix_len;
600
601 ASSERT3U(old_prefix_len, <=, zap->zap_f.zap_phys->zap_ptrtbl.zt_shift);
602 ASSERT(RW_LOCK_HELD(&zap->zap_rwlock));
603
604 ASSERT3U(ZAP_HASH_IDX(hash, old_prefix_len), ==,
605 l->l_phys->l_hdr.lh_prefix);
606
607 if (zap_tryupgradedir(zap, tx) == 0 ||
608 old_prefix_len == zap->zap_f.zap_phys->zap_ptrtbl.zt_shift) {
609 /* We failed to upgrade, or need to grow the pointer table */
610 objset_t *os = zap->zap_objset;
611 uint64_t object = zap->zap_object;
612
613 zap_put_leaf(l);
614 zap_unlockdir(zap);
615 err = zap_lockdir(os, object, tx, RW_WRITER,
616 FALSE, FALSE, &zn->zn_zap);
617 zap = zn->zn_zap;
618 if (err)
619 return (err);
620 ASSERT(!zap->zap_ismicro);
621
622 while (old_prefix_len ==
623 zap->zap_f.zap_phys->zap_ptrtbl.zt_shift) {
624 err = zap_grow_ptrtbl(zap, tx);
625 if (err)
626 return (err);
627 }
628
629 err = zap_deref_leaf(zap, hash, tx, RW_WRITER, &l);
630 if (err)
631 return (err);
632
633 if (l->l_phys->l_hdr.lh_prefix_len != old_prefix_len) {
634 /* it split while our locks were down */
635 *lp = l;
636 return (0);
637 }
638 }
639 ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
640 ASSERT3U(old_prefix_len, <, zap->zap_f.zap_phys->zap_ptrtbl.zt_shift);
641 ASSERT3U(ZAP_HASH_IDX(hash, old_prefix_len), ==,
642 l->l_phys->l_hdr.lh_prefix);
643
644 prefix_diff = zap->zap_f.zap_phys->zap_ptrtbl.zt_shift -
645 (old_prefix_len + 1);
646 sibling = (ZAP_HASH_IDX(hash, old_prefix_len + 1) | 1) << prefix_diff;
647
648 /* check for i/o errors before doing zap_leaf_split */
649 for (i = 0; i < (1ULL<<prefix_diff); i++) {
650 uint64_t blk;
651 err = zap_idx_to_blk(zap, sibling+i, &blk);
652 if (err)
653 return (err);
654 ASSERT3U(blk, ==, l->l_blkid);
655 }
656
657 nl = zap_create_leaf(zap, tx);
658 zap_leaf_split(l, nl, zap->zap_normflags != 0);
659
660 /* set sibling pointers */
661 for (i = 0; i < (1ULL << prefix_diff); i++) {
662 err = zap_set_idx_to_blk(zap, sibling+i, nl->l_blkid, tx);
663 ASSERT0(err); /* we checked for i/o errors above */
664 }
665
666 if (hash & (1ULL << (64 - l->l_phys->l_hdr.lh_prefix_len))) {
667 /* we want the sibling */
668 zap_put_leaf(l);
669 *lp = nl;
670 } else {
671 zap_put_leaf(nl);
672 *lp = l;
673 }
674
675 return (0);
676}
677
678static void
679zap_put_leaf_maybe_grow_ptrtbl(zap_name_t *zn, zap_leaf_t *l, dmu_tx_t *tx)
680{
681 zap_t *zap = zn->zn_zap;
682 int shift = zap->zap_f.zap_phys->zap_ptrtbl.zt_shift;
683 int leaffull = (l->l_phys->l_hdr.lh_prefix_len == shift &&
684 l->l_phys->l_hdr.lh_nfree < ZAP_LEAF_LOW_WATER);
685
686 zap_put_leaf(l);
687
688 if (leaffull || zap->zap_f.zap_phys->zap_ptrtbl.zt_nextblk) {
689 int err;
690
691 /*
692 * We are in the middle of growing the pointer table, or
693 * this leaf will soon make us grow it.
694 */
695 if (zap_tryupgradedir(zap, tx) == 0) {
696 objset_t *os = zap->zap_objset;
697 uint64_t zapobj = zap->zap_object;
698
699 zap_unlockdir(zap);
700 err = zap_lockdir(os, zapobj, tx,
701 RW_WRITER, FALSE, FALSE, &zn->zn_zap);
702 zap = zn->zn_zap;
703 if (err)
704 return;
705 }
706
707 /* could have finished growing while our locks were down */
708 if (zap->zap_f.zap_phys->zap_ptrtbl.zt_shift == shift)
709 (void) zap_grow_ptrtbl(zap, tx);
710 }
711}
712
713static int
714fzap_checkname(zap_name_t *zn)
715{
716 if (zn->zn_key_orig_numints * zn->zn_key_intlen > ZAP_MAXNAMELEN)
717 return (ENAMETOOLONG);
718 return (0);
719}
720
721static int
722fzap_checksize(uint64_t integer_size, uint64_t num_integers)
723{
724 /* Only integer sizes supported by C */
725 switch (integer_size) {
726 case 1:
727 case 2:
728 case 4:
729 case 8:
730 break;
731 default:
732 return (EINVAL);
733 }
734
735 if (integer_size * num_integers > ZAP_MAXVALUELEN)
736 return (E2BIG);
737
738 return (0);
739}
740
741static int
742fzap_check(zap_name_t *zn, uint64_t integer_size, uint64_t num_integers)
743{
744 int err;
745
746 if ((err = fzap_checkname(zn)) != 0)
747 return (err);
748 return (fzap_checksize(integer_size, num_integers));
749}
750
751/*
752 * Routines for manipulating attributes.
753 */
754int
755fzap_lookup(zap_name_t *zn,
756 uint64_t integer_size, uint64_t num_integers, void *buf,
757 char *realname, int rn_len, boolean_t *ncp)
758{
759 zap_leaf_t *l;
760 int err;
761 zap_entry_handle_t zeh;
762
763 if ((err = fzap_checkname(zn)) != 0)
764 return (err);
765
766 err = zap_deref_leaf(zn->zn_zap, zn->zn_hash, NULL, RW_READER, &l);
767 if (err != 0)
768 return (err);
769 err = zap_leaf_lookup(l, zn, &zeh);
770 if (err == 0) {
771 if ((err = fzap_checksize(integer_size, num_integers)) != 0) {
772 zap_put_leaf(l);
773 return (err);
774 }
775
776 err = zap_entry_read(&zeh, integer_size, num_integers, buf);
777 (void) zap_entry_read_name(zn->zn_zap, &zeh, rn_len, realname);
778 if (ncp) {
779 *ncp = zap_entry_normalization_conflict(&zeh,
780 zn, NULL, zn->zn_zap);
781 }
782 }
783
784 zap_put_leaf(l);
785 return (err);
786}
787
788int
789fzap_add_cd(zap_name_t *zn,
790 uint64_t integer_size, uint64_t num_integers,
791 const void *val, uint32_t cd, dmu_tx_t *tx)
792{
793 zap_leaf_t *l;
794 int err;
795 zap_entry_handle_t zeh;
796 zap_t *zap = zn->zn_zap;
797
798 ASSERT(RW_LOCK_HELD(&zap->zap_rwlock));
799 ASSERT(!zap->zap_ismicro);
800 ASSERT(fzap_check(zn, integer_size, num_integers) == 0);
801
802 err = zap_deref_leaf(zap, zn->zn_hash, tx, RW_WRITER, &l);
803 if (err != 0)
804 return (err);
805retry:
806 err = zap_leaf_lookup(l, zn, &zeh);
807 if (err == 0) {
808 err = EEXIST;
809 goto out;
810 }
811 if (err != ENOENT)
812 goto out;
813
814 err = zap_entry_create(l, zn, cd,
815 integer_size, num_integers, val, &zeh);
816
817 if (err == 0) {
818 zap_increment_num_entries(zap, 1, tx);
819 } else if (err == EAGAIN) {
820 err = zap_expand_leaf(zn, l, tx, &l);
821 zap = zn->zn_zap; /* zap_expand_leaf() may change zap */
822 if (err == 0)
823 goto retry;
824 }
825
826out:
827 if (zap != NULL)
828 zap_put_leaf_maybe_grow_ptrtbl(zn, l, tx);
829 return (err);
830}
831
832int
833fzap_add(zap_name_t *zn,
834 uint64_t integer_size, uint64_t num_integers,
835 const void *val, dmu_tx_t *tx)
836{
837 int err = fzap_check(zn, integer_size, num_integers);
838 if (err != 0)
839 return (err);
840
841 return (fzap_add_cd(zn, integer_size, num_integers,
842 val, ZAP_NEED_CD, tx));
843}
844
845int
846fzap_update(zap_name_t *zn,
847 int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx)
848{
849 zap_leaf_t *l;
850 int err, create;
851 zap_entry_handle_t zeh;
852 zap_t *zap = zn->zn_zap;
853
854 ASSERT(RW_LOCK_HELD(&zap->zap_rwlock));
855 err = fzap_check(zn, integer_size, num_integers);
856 if (err != 0)
857 return (err);
858
859 err = zap_deref_leaf(zap, zn->zn_hash, tx, RW_WRITER, &l);
860 if (err != 0)
861 return (err);
862retry:
863 err = zap_leaf_lookup(l, zn, &zeh);
864 create = (err == ENOENT);
865 ASSERT(err == 0 || err == ENOENT);
866
867 if (create) {
868 err = zap_entry_create(l, zn, ZAP_NEED_CD,
869 integer_size, num_integers, val, &zeh);
870 if (err == 0)
871 zap_increment_num_entries(zap, 1, tx);
872 } else {
873 err = zap_entry_update(&zeh, integer_size, num_integers, val);
874 }
875
876 if (err == EAGAIN) {
877 err = zap_expand_leaf(zn, l, tx, &l);
878 zap = zn->zn_zap; /* zap_expand_leaf() may change zap */
879 if (err == 0)
880 goto retry;
881 }
882
883 if (zap != NULL)
884 zap_put_leaf_maybe_grow_ptrtbl(zn, l, tx);
885 return (err);
886}
887
888int
889fzap_length(zap_name_t *zn,
890 uint64_t *integer_size, uint64_t *num_integers)
891{
892 zap_leaf_t *l;
893 int err;
894 zap_entry_handle_t zeh;
895
896 err = zap_deref_leaf(zn->zn_zap, zn->zn_hash, NULL, RW_READER, &l);
897 if (err != 0)
898 return (err);
899 err = zap_leaf_lookup(l, zn, &zeh);
900 if (err != 0)
901 goto out;
902
903 if (integer_size)
904 *integer_size = zeh.zeh_integer_size;
905 if (num_integers)
906 *num_integers = zeh.zeh_num_integers;
907out:
908 zap_put_leaf(l);
909 return (err);
910}
911
912int
913fzap_remove(zap_name_t *zn, dmu_tx_t *tx)
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, tx, RW_WRITER, &l);
920 if (err != 0)
921 return (err);
922 err = zap_leaf_lookup(l, zn, &zeh);
923 if (err == 0) {
924 zap_entry_remove(&zeh);
925 zap_increment_num_entries(zn->zn_zap, -1, tx);
926 }
927 zap_put_leaf(l);
928 return (err);
929}
930
931void
932fzap_prefetch(zap_name_t *zn)
933{
934 uint64_t idx, blk;
935 zap_t *zap = zn->zn_zap;
936 int bs;
937
938 idx = ZAP_HASH_IDX(zn->zn_hash,
939 zap->zap_f.zap_phys->zap_ptrtbl.zt_shift);
940 if (zap_idx_to_blk(zap, idx, &blk) != 0)
941 return;
942 bs = FZAP_BLOCK_SHIFT(zap);
943 dmu_prefetch(zap->zap_objset, zap->zap_object, blk << bs, 1 << bs);
944}
945
946/*
947 * Helper functions for consumers.
948 */
949
950uint64_t
951zap_create_link(objset_t *os, dmu_object_type_t ot, uint64_t parent_obj,
952 const char *name, dmu_tx_t *tx)
953{
954 uint64_t new_obj;
955
956 VERIFY((new_obj = zap_create(os, ot, DMU_OT_NONE, 0, tx)) > 0);
957 VERIFY(zap_add(os, parent_obj, name, sizeof (uint64_t), 1, &new_obj,
958 tx) == 0);
959
960 return (new_obj);
961}
962
963int
964zap_value_search(objset_t *os, uint64_t zapobj, uint64_t value, uint64_t mask,
965 char *name)
966{
967 zap_cursor_t zc;
968 zap_attribute_t *za;
969 int err;
970
971 if (mask == 0)
972 mask = -1ULL;
973
974 za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
975 for (zap_cursor_init(&zc, os, zapobj);
976 (err = zap_cursor_retrieve(&zc, za)) == 0;
977 zap_cursor_advance(&zc)) {
978 if ((za->za_first_integer & mask) == (value & mask)) {
979 (void) strcpy(name, za->za_name);
980 break;
981 }
982 }
983 zap_cursor_fini(&zc);
984 kmem_free(za, sizeof (zap_attribute_t));
985 return (err);
986}
987
988int
989zap_join(objset_t *os, uint64_t fromobj, uint64_t intoobj, dmu_tx_t *tx)
990{
991 zap_cursor_t zc;
992 zap_attribute_t za;
993 int err;
994
995 for (zap_cursor_init(&zc, os, fromobj);
996 zap_cursor_retrieve(&zc, &za) == 0;
997 (void) zap_cursor_advance(&zc)) {
998 if (za.za_integer_length != 8 || za.za_num_integers != 1)
999 return (EINVAL);
1000 err = zap_add(os, intoobj, za.za_name,
1001 8, 1, &za.za_first_integer, tx);
1002 if (err)
1003 return (err);
1004 }
1005 zap_cursor_fini(&zc);
1006 return (0);
1007}
1008
1009int
1010zap_join_key(objset_t *os, uint64_t fromobj, uint64_t intoobj,
1011 uint64_t value, dmu_tx_t *tx)
1012{
1013 zap_cursor_t zc;
1014 zap_attribute_t za;
1015 int err;
1016
1017 for (zap_cursor_init(&zc, os, fromobj);
1018 zap_cursor_retrieve(&zc, &za) == 0;
1019 (void) zap_cursor_advance(&zc)) {
1020 if (za.za_integer_length != 8 || za.za_num_integers != 1)
1021 return (EINVAL);
1022 err = zap_add(os, intoobj, za.za_name,
1023 8, 1, &value, tx);
1024 if (err)
1025 return (err);
1026 }
1027 zap_cursor_fini(&zc);
1028 return (0);
1029}
1030
1031int
1032zap_join_increment(objset_t *os, uint64_t fromobj, uint64_t intoobj,
1033 dmu_tx_t *tx)
1034{
1035 zap_cursor_t zc;
1036 zap_attribute_t za;
1037 int err;
1038
1039 for (zap_cursor_init(&zc, os, fromobj);
1040 zap_cursor_retrieve(&zc, &za) == 0;
1041 (void) zap_cursor_advance(&zc)) {
1042 uint64_t delta = 0;
1043
1044 if (za.za_integer_length != 8 || za.za_num_integers != 1)
1045 return (EINVAL);
1046
1047 err = zap_lookup(os, intoobj, za.za_name, 8, 1, &delta);
1048 if (err != 0 && err != ENOENT)
1049 return (err);
1050 delta += za.za_first_integer;
1051 err = zap_update(os, intoobj, za.za_name, 8, 1, &delta, tx);
1052 if (err)
1053 return (err);
1054 }
1055 zap_cursor_fini(&zc);
1056 return (0);
1057}
1058
1059int
1060zap_add_int(objset_t *os, uint64_t obj, uint64_t value, dmu_tx_t *tx)
1061{
1062 char name[20];
1063
1064 (void) snprintf(name, sizeof (name), "%llx", (longlong_t)value);
1065 return (zap_add(os, obj, name, 8, 1, &value, tx));
1066}
1067
1068int
1069zap_remove_int(objset_t *os, uint64_t obj, uint64_t value, dmu_tx_t *tx)
1070{
1071 char name[20];
1072
1073 (void) snprintf(name, sizeof (name), "%llx", (longlong_t)value);
1074 return (zap_remove(os, obj, name, tx));
1075}
1076
1077int
1078zap_lookup_int(objset_t *os, uint64_t obj, uint64_t value)
1079{
1080 char name[20];
1081
1082 (void) snprintf(name, sizeof (name), "%llx", (longlong_t)value);
1083 return (zap_lookup(os, obj, name, 8, 1, &value));
1084}
1085
1086int
1087zap_add_int_key(objset_t *os, uint64_t obj,
1088 uint64_t key, uint64_t value, dmu_tx_t *tx)
1089{
1090 char name[20];
1091
1092 (void) snprintf(name, sizeof (name), "%llx", (longlong_t)key);
1093 return (zap_add(os, obj, name, 8, 1, &value, tx));
1094}
1095
1096int
1097zap_update_int_key(objset_t *os, uint64_t obj,
1098 uint64_t key, uint64_t value, dmu_tx_t *tx)
1099{
1100 char name[20];
1101
1102 (void) snprintf(name, sizeof (name), "%llx", (longlong_t)key);
1103 return (zap_update(os, obj, name, 8, 1, &value, tx));
1104}
1105
1106int
1107zap_lookup_int_key(objset_t *os, uint64_t obj, uint64_t key, uint64_t *valuep)
1108{
1109 char name[20];
1110
1111 (void) snprintf(name, sizeof (name), "%llx", (longlong_t)key);
1112 return (zap_lookup(os, obj, name, 8, 1, valuep));
1113}
1114
1115int
1116zap_increment(objset_t *os, uint64_t obj, const char *name, int64_t delta,
1117 dmu_tx_t *tx)
1118{
1119 uint64_t value = 0;
1120 int err;
1121
1122 if (delta == 0)
1123 return (0);
1124
1125 err = zap_lookup(os, obj, name, 8, 1, &value);
1126 if (err != 0 && err != ENOENT)
1127 return (err);
1128 value += delta;
1129 if (value == 0)
1130 err = zap_remove(os, obj, name, tx);
1131 else
1132 err = zap_update(os, obj, name, 8, 1, &value, tx);
1133 return (err);
1134}
1135
1136int
1137zap_increment_int(objset_t *os, uint64_t obj, uint64_t key, int64_t delta,
1138 dmu_tx_t *tx)
1139{
1140 char name[20];
1141
1142 (void) snprintf(name, sizeof (name), "%llx", (longlong_t)key);
1143 return (zap_increment(os, obj, name, delta, tx));
1144}
1145
1146/*
1147 * Routines for iterating over the attributes.
1148 */
1149
1150int
1151fzap_cursor_retrieve(zap_t *zap, zap_cursor_t *zc, zap_attribute_t *za)
1152{
1153 int err = ENOENT;
1154 zap_entry_handle_t zeh;
1155 zap_leaf_t *l;
1156
1157 /* retrieve the next entry at or after zc_hash/zc_cd */
1158 /* if no entry, return ENOENT */
1159
1160 if (zc->zc_leaf &&
1161 (ZAP_HASH_IDX(zc->zc_hash,
1162 zc->zc_leaf->l_phys->l_hdr.lh_prefix_len) !=
1163 zc->zc_leaf->l_phys->l_hdr.lh_prefix)) {
1164 rw_enter(&zc->zc_leaf->l_rwlock, RW_READER);
1165 zap_put_leaf(zc->zc_leaf);
1166 zc->zc_leaf = NULL;
1167 }
1168
1169again:
1170 if (zc->zc_leaf == NULL) {
1171 err = zap_deref_leaf(zap, zc->zc_hash, NULL, RW_READER,
1172 &zc->zc_leaf);
1173 if (err != 0)
1174 return (err);
1175 } else {
1176 rw_enter(&zc->zc_leaf->l_rwlock, RW_READER);
1177 }
1178 l = zc->zc_leaf;
1179
1180 err = zap_leaf_lookup_closest(l, zc->zc_hash, zc->zc_cd, &zeh);
1181
1182 if (err == ENOENT) {
1183 uint64_t nocare =
1184 (1ULL << (64 - l->l_phys->l_hdr.lh_prefix_len)) - 1;
1185 zc->zc_hash = (zc->zc_hash & ~nocare) + nocare + 1;
1186 zc->zc_cd = 0;
1187 if (l->l_phys->l_hdr.lh_prefix_len == 0 || zc->zc_hash == 0) {
1188 zc->zc_hash = -1ULL;
1189 } else {
1190 zap_put_leaf(zc->zc_leaf);
1191 zc->zc_leaf = NULL;
1192 goto again;
1193 }
1194 }
1195
1196 if (err == 0) {
1197 zc->zc_hash = zeh.zeh_hash;
1198 zc->zc_cd = zeh.zeh_cd;
1199 za->za_integer_length = zeh.zeh_integer_size;
1200 za->za_num_integers = zeh.zeh_num_integers;
1201 if (zeh.zeh_num_integers == 0) {
1202 za->za_first_integer = 0;
1203 } else {
1204 err = zap_entry_read(&zeh, 8, 1, &za->za_first_integer);
1205 ASSERT(err == 0 || err == EOVERFLOW);
1206 }
1207 err = zap_entry_read_name(zap, &zeh,
1208 sizeof (za->za_name), za->za_name);
1209 ASSERT(err == 0);
1210
1211 za->za_normalization_conflict =
1212 zap_entry_normalization_conflict(&zeh,
1213 NULL, za->za_name, zap);
1214 }
1215 rw_exit(&zc->zc_leaf->l_rwlock);
1216 return (err);
1217}
1218
1219static void
1220zap_stats_ptrtbl(zap_t *zap, uint64_t *tbl, int len, zap_stats_t *zs)
1221{
1222 int i, err;
1223 uint64_t lastblk = 0;
1224
1225 /*
1226 * NB: if a leaf has more pointers than an entire ptrtbl block
1227 * can hold, then it'll be accounted for more than once, since
1228 * we won't have lastblk.
1229 */
1230 for (i = 0; i < len; i++) {
1231 zap_leaf_t *l;
1232
1233 if (tbl[i] == lastblk)
1234 continue;
1235 lastblk = tbl[i];
1236
1237 err = zap_get_leaf_byblk(zap, tbl[i], NULL, RW_READER, &l);
1238 if (err == 0) {
1239 zap_leaf_stats(zap, l, zs);
1240 zap_put_leaf(l);
1241 }
1242 }
1243}
1244
1245int
1246fzap_cursor_move_to_key(zap_cursor_t *zc, zap_name_t *zn)
1247{
1248 int err;
1249 zap_leaf_t *l;
1250 zap_entry_handle_t zeh;
1251
1252 if (zn->zn_key_orig_numints * zn->zn_key_intlen > ZAP_MAXNAMELEN)
1253 return (ENAMETOOLONG);
1254
1255 err = zap_deref_leaf(zc->zc_zap, zn->zn_hash, NULL, RW_READER, &l);
1256 if (err != 0)
1257 return (err);
1258
1259 err = zap_leaf_lookup(l, zn, &zeh);
1260 if (err != 0)
1261 return (err);
1262
1263 zc->zc_leaf = l;
1264 zc->zc_hash = zeh.zeh_hash;
1265 zc->zc_cd = zeh.zeh_cd;
1266
1267 return (err);
1268}
1269
1270void
1271fzap_get_stats(zap_t *zap, zap_stats_t *zs)
1272{
1273 int bs = FZAP_BLOCK_SHIFT(zap);
1274 zs->zs_blocksize = 1ULL << bs;
1275
1276 /*
1277 * Set zap_phys_t fields
1278 */
1279 zs->zs_num_leafs = zap->zap_f.zap_phys->zap_num_leafs;
1280 zs->zs_num_entries = zap->zap_f.zap_phys->zap_num_entries;
1281 zs->zs_num_blocks = zap->zap_f.zap_phys->zap_freeblk;
1282 zs->zs_block_type = zap->zap_f.zap_phys->zap_block_type;
1283 zs->zs_magic = zap->zap_f.zap_phys->zap_magic;
1284 zs->zs_salt = zap->zap_f.zap_phys->zap_salt;
1285
1286 /*
1287 * Set zap_ptrtbl fields
1288 */
1289 zs->zs_ptrtbl_len = 1ULL << zap->zap_f.zap_phys->zap_ptrtbl.zt_shift;
1290 zs->zs_ptrtbl_nextblk = zap->zap_f.zap_phys->zap_ptrtbl.zt_nextblk;
1291 zs->zs_ptrtbl_blks_copied =
1292 zap->zap_f.zap_phys->zap_ptrtbl.zt_blks_copied;
1293 zs->zs_ptrtbl_zt_blk = zap->zap_f.zap_phys->zap_ptrtbl.zt_blk;
1294 zs->zs_ptrtbl_zt_numblks = zap->zap_f.zap_phys->zap_ptrtbl.zt_numblks;
1295 zs->zs_ptrtbl_zt_shift = zap->zap_f.zap_phys->zap_ptrtbl.zt_shift;
1296
1297 if (zap->zap_f.zap_phys->zap_ptrtbl.zt_numblks == 0) {
1298 /* the ptrtbl is entirely in the header block. */
1299 zap_stats_ptrtbl(zap, &ZAP_EMBEDDED_PTRTBL_ENT(zap, 0),
1300 1 << ZAP_EMBEDDED_PTRTBL_SHIFT(zap), zs);
1301 } else {
1302 int b;
1303
1304 dmu_prefetch(zap->zap_objset, zap->zap_object,
1305 zap->zap_f.zap_phys->zap_ptrtbl.zt_blk << bs,
1306 zap->zap_f.zap_phys->zap_ptrtbl.zt_numblks << bs);
1307
1308 for (b = 0; b < zap->zap_f.zap_phys->zap_ptrtbl.zt_numblks;
1309 b++) {
1310 dmu_buf_t *db;
1311 int err;
1312
1313 err = dmu_buf_hold(zap->zap_objset, zap->zap_object,
1314 (zap->zap_f.zap_phys->zap_ptrtbl.zt_blk + b) << bs,
1315 FTAG, &db, DMU_READ_NO_PREFETCH);
1316 if (err == 0) {
1317 zap_stats_ptrtbl(zap, db->db_data,
1318 1<<(bs-3), zs);
1319 dmu_buf_rele(db, FTAG);
1320 }
1321 }
1322 }
1323}
1324
1325int
1326fzap_count_write(zap_name_t *zn, int add, uint64_t *towrite,
1327 uint64_t *tooverwrite)
1328{
1329 zap_t *zap = zn->zn_zap;
1330 zap_leaf_t *l;
1331 int err;
1332
1333 /*
1334 * Account for the header block of the fatzap.
1335 */
1336 if (!add && dmu_buf_freeable(zap->zap_dbuf)) {
1337 *tooverwrite += zap->zap_dbuf->db_size;
1338 } else {
1339 *towrite += zap->zap_dbuf->db_size;
1340 }
1341
1342 /*
1343 * Account for the pointer table blocks.
1344 * If we are adding we need to account for the following cases :
1345 * - If the pointer table is embedded, this operation could force an
1346 * external pointer table.
1347 * - If this already has an external pointer table this operation
1348 * could extend the table.
1349 */
1350 if (add) {
1351 if (zap->zap_f.zap_phys->zap_ptrtbl.zt_blk == 0)
1352 *towrite += zap->zap_dbuf->db_size;
1353 else
1354 *towrite += (zap->zap_dbuf->db_size * 3);
1355 }
1356
1357 /*
1358 * Now, check if the block containing leaf is freeable
1359 * and account accordingly.
1360 */
1361 err = zap_deref_leaf(zap, zn->zn_hash, NULL, RW_READER, &l);
1362 if (err != 0) {
1363 return (err);
1364 }
1365
1366 if (!add && dmu_buf_freeable(l->l_dbuf)) {
1367 *tooverwrite += l->l_dbuf->db_size;
1368 } else {
1369 /*
1370 * If this an add operation, the leaf block could split.
1371 * Hence, we need to account for an additional leaf block.
1372 */
1373 *towrite += (add ? 2 : 1) * l->l_dbuf->db_size;
1374 }
1375
1376 zap_put_leaf(l);
1377 return (0);
1378}