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34dc7c2f BB |
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 | |
1d3ba0bf | 9 | * or https://opensource.org/licenses/CDDL-1.0. |
34dc7c2f BB |
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 | /* | |
428870ff | 22 | * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
d9b4bf06 | 23 | * Copyright (c) 2012, 2018 by Delphix. All rights reserved. |
0c66c32d | 24 | * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. |
34dc7c2f BB |
25 | */ |
26 | ||
34dc7c2f BB |
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> | |
9babb374 | 46 | #include <sys/fs/zfs.h> |
34dc7c2f | 47 | #include <sys/zap.h> |
34dc7c2f BB |
48 | #include <sys/zap_impl.h> |
49 | #include <sys/zap_leaf.h> | |
50 | ||
d9b4bf06 MA |
51 | /* |
52 | * If zap_iterate_prefetch is set, we will prefetch the entire ZAP object | |
53 | * (all leaf blocks) when we start iterating over it. | |
54 | * | |
55 | * For zap_cursor_init(), the callers all intend to iterate through all the | |
56 | * entries. There are a few cases where an error (typically i/o error) could | |
57 | * cause it to bail out early. | |
58 | * | |
59 | * For zap_cursor_init_serialized(), there are callers that do the iteration | |
60 | * outside of ZFS. Typically they would iterate over everything, but we | |
61 | * don't have control of that. E.g. zfs_ioc_snapshot_list_next(), | |
62 | * zcp_snapshots_iter(), and other iterators over things in the MOS - these | |
63 | * are called by /sbin/zfs and channel programs. The other example is | |
64 | * zfs_readdir() which iterates over directory entries for the getdents() | |
65 | * syscall. /sbin/ls iterates to the end (unless it receives a signal), but | |
66 | * userland doesn't have to. | |
67 | * | |
68 | * Given that the ZAP entries aren't returned in a specific order, the only | |
69 | * legitimate use cases for partial iteration would be: | |
70 | * | |
71 | * 1. Pagination: e.g. you only want to display 100 entries at a time, so you | |
72 | * get the first 100 and then wait for the user to hit "next page", which | |
73 | * they may never do). | |
74 | * | |
75 | * 2. You want to know if there are more than X entries, without relying on | |
76 | * the zfs-specific implementation of the directory's st_size (which is | |
77 | * the number of entries). | |
78 | */ | |
18168da7 | 79 | static int zap_iterate_prefetch = B_TRUE; |
d9b4bf06 | 80 | |
34dc7c2f BB |
81 | int fzap_default_block_shift = 14; /* 16k blocksize */ |
82 | ||
34dc7c2f BB |
83 | static uint64_t zap_allocate_blocks(zap_t *zap, int nblocks); |
84 | ||
34dc7c2f BB |
85 | void |
86 | fzap_byteswap(void *vbuf, size_t size) | |
87 | { | |
d2a12f9e | 88 | uint64_t block_type = *(uint64_t *)vbuf; |
34dc7c2f BB |
89 | |
90 | if (block_type == ZBT_LEAF || block_type == BSWAP_64(ZBT_LEAF)) | |
91 | zap_leaf_byteswap(vbuf, size); | |
92 | else { | |
93 | /* it's a ptrtbl block */ | |
94 | byteswap_uint64_array(vbuf, size); | |
95 | } | |
96 | } | |
97 | ||
98 | void | |
428870ff | 99 | fzap_upgrade(zap_t *zap, dmu_tx_t *tx, zap_flags_t flags) |
34dc7c2f | 100 | { |
34dc7c2f BB |
101 | ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); |
102 | zap->zap_ismicro = FALSE; | |
103 | ||
39efbde7 GM |
104 | zap->zap_dbu.dbu_evict_func_sync = zap_evict_sync; |
105 | zap->zap_dbu.dbu_evict_func_async = NULL; | |
34dc7c2f | 106 | |
c17486b2 | 107 | mutex_init(&zap->zap_f.zap_num_entries_mtx, 0, MUTEX_DEFAULT, 0); |
9bd274dd | 108 | zap->zap_f.zap_block_shift = highbit64(zap->zap_dbuf->db_size) - 1; |
34dc7c2f | 109 | |
d2a12f9e | 110 | zap_phys_t *zp = zap_f_phys(zap); |
34dc7c2f BB |
111 | /* |
112 | * explicitly zero it since it might be coming from an | |
113 | * initialized microzap | |
114 | */ | |
861166b0 | 115 | memset(zap->zap_dbuf->db_data, 0, zap->zap_dbuf->db_size); |
34dc7c2f BB |
116 | zp->zap_block_type = ZBT_HEADER; |
117 | zp->zap_magic = ZAP_MAGIC; | |
118 | ||
119 | zp->zap_ptrtbl.zt_shift = ZAP_EMBEDDED_PTRTBL_SHIFT(zap); | |
120 | ||
121 | zp->zap_freeblk = 2; /* block 1 will be the first leaf */ | |
122 | zp->zap_num_leafs = 1; | |
123 | zp->zap_num_entries = 0; | |
124 | zp->zap_salt = zap->zap_salt; | |
125 | zp->zap_normflags = zap->zap_normflags; | |
428870ff | 126 | zp->zap_flags = flags; |
34dc7c2f BB |
127 | |
128 | /* block 1 will be the first leaf */ | |
d2a12f9e | 129 | for (int i = 0; i < (1<<zp->zap_ptrtbl.zt_shift); i++) |
34dc7c2f BB |
130 | ZAP_EMBEDDED_PTRTBL_ENT(zap, i) = 1; |
131 | ||
132 | /* | |
133 | * set up block 1 - the first leaf | |
134 | */ | |
d2a12f9e | 135 | dmu_buf_t *db; |
80cc5162 | 136 | VERIFY0(dmu_buf_hold_by_dnode(zap->zap_dnode, |
428870ff | 137 | 1<<FZAP_BLOCK_SHIFT(zap), FTAG, &db, DMU_READ_NO_PREFETCH)); |
34dc7c2f BB |
138 | dmu_buf_will_dirty(db, tx); |
139 | ||
d2a12f9e | 140 | zap_leaf_t *l = kmem_zalloc(sizeof (zap_leaf_t), KM_SLEEP); |
34dc7c2f | 141 | l->l_dbuf = db; |
34dc7c2f BB |
142 | |
143 | zap_leaf_init(l, zp->zap_normflags != 0); | |
144 | ||
145 | kmem_free(l, sizeof (zap_leaf_t)); | |
146 | dmu_buf_rele(db, FTAG); | |
147 | } | |
148 | ||
149 | static int | |
150 | zap_tryupgradedir(zap_t *zap, dmu_tx_t *tx) | |
151 | { | |
152 | if (RW_WRITE_HELD(&zap->zap_rwlock)) | |
153 | return (1); | |
154 | if (rw_tryupgrade(&zap->zap_rwlock)) { | |
155 | dmu_buf_will_dirty(zap->zap_dbuf, tx); | |
156 | return (1); | |
157 | } | |
158 | return (0); | |
159 | } | |
160 | ||
161 | /* | |
162 | * Generic routines for dealing with the pointer & cookie tables. | |
163 | */ | |
164 | ||
165 | static int | |
166 | zap_table_grow(zap_t *zap, zap_table_phys_t *tbl, | |
167 | void (*transfer_func)(const uint64_t *src, uint64_t *dst, int n), | |
168 | dmu_tx_t *tx) | |
169 | { | |
d2a12f9e | 170 | uint64_t newblk; |
34dc7c2f BB |
171 | int bs = FZAP_BLOCK_SHIFT(zap); |
172 | int hepb = 1<<(bs-4); | |
173 | /* hepb = half the number of entries in a block */ | |
174 | ||
175 | ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); | |
176 | ASSERT(tbl->zt_blk != 0); | |
177 | ASSERT(tbl->zt_numblks > 0); | |
178 | ||
179 | if (tbl->zt_nextblk != 0) { | |
180 | newblk = tbl->zt_nextblk; | |
181 | } else { | |
182 | newblk = zap_allocate_blocks(zap, tbl->zt_numblks * 2); | |
183 | tbl->zt_nextblk = newblk; | |
c99c9001 | 184 | ASSERT0(tbl->zt_blks_copied); |
80cc5162 | 185 | dmu_prefetch_by_dnode(zap->zap_dnode, 0, |
fcff0f35 PD |
186 | tbl->zt_blk << bs, tbl->zt_numblks << bs, |
187 | ZIO_PRIORITY_SYNC_READ); | |
34dc7c2f BB |
188 | } |
189 | ||
190 | /* | |
191 | * Copy the ptrtbl from the old to new location. | |
192 | */ | |
193 | ||
d2a12f9e MA |
194 | uint64_t b = tbl->zt_blks_copied; |
195 | dmu_buf_t *db_old; | |
80cc5162 | 196 | int err = dmu_buf_hold_by_dnode(zap->zap_dnode, |
428870ff | 197 | (tbl->zt_blk + b) << bs, FTAG, &db_old, DMU_READ_NO_PREFETCH); |
d2a12f9e | 198 | if (err != 0) |
34dc7c2f BB |
199 | return (err); |
200 | ||
201 | /* first half of entries in old[b] go to new[2*b+0] */ | |
d2a12f9e | 202 | dmu_buf_t *db_new; |
80cc5162 | 203 | VERIFY0(dmu_buf_hold_by_dnode(zap->zap_dnode, |
428870ff | 204 | (newblk + 2*b+0) << bs, FTAG, &db_new, DMU_READ_NO_PREFETCH)); |
34dc7c2f BB |
205 | dmu_buf_will_dirty(db_new, tx); |
206 | transfer_func(db_old->db_data, db_new->db_data, hepb); | |
207 | dmu_buf_rele(db_new, FTAG); | |
208 | ||
209 | /* second half of entries in old[b] go to new[2*b+1] */ | |
80cc5162 | 210 | VERIFY0(dmu_buf_hold_by_dnode(zap->zap_dnode, |
428870ff | 211 | (newblk + 2*b+1) << bs, FTAG, &db_new, DMU_READ_NO_PREFETCH)); |
34dc7c2f BB |
212 | dmu_buf_will_dirty(db_new, tx); |
213 | transfer_func((uint64_t *)db_old->db_data + hepb, | |
214 | db_new->db_data, hepb); | |
215 | dmu_buf_rele(db_new, FTAG); | |
216 | ||
217 | dmu_buf_rele(db_old, FTAG); | |
218 | ||
219 | tbl->zt_blks_copied++; | |
220 | ||
221 | dprintf("copied block %llu of %llu\n", | |
8e739b2c RE |
222 | (u_longlong_t)tbl->zt_blks_copied, |
223 | (u_longlong_t)tbl->zt_numblks); | |
34dc7c2f BB |
224 | |
225 | if (tbl->zt_blks_copied == tbl->zt_numblks) { | |
226 | (void) dmu_free_range(zap->zap_objset, zap->zap_object, | |
227 | tbl->zt_blk << bs, tbl->zt_numblks << bs, tx); | |
228 | ||
229 | tbl->zt_blk = newblk; | |
230 | tbl->zt_numblks *= 2; | |
231 | tbl->zt_shift++; | |
232 | tbl->zt_nextblk = 0; | |
233 | tbl->zt_blks_copied = 0; | |
234 | ||
29e57d15 | 235 | dprintf("finished; numblocks now %llu (%uk entries)\n", |
8e739b2c | 236 | (u_longlong_t)tbl->zt_numblks, 1<<(tbl->zt_shift-10)); |
34dc7c2f BB |
237 | } |
238 | ||
239 | return (0); | |
240 | } | |
241 | ||
242 | static int | |
243 | zap_table_store(zap_t *zap, zap_table_phys_t *tbl, uint64_t idx, uint64_t val, | |
244 | dmu_tx_t *tx) | |
245 | { | |
34dc7c2f | 246 | int bs = FZAP_BLOCK_SHIFT(zap); |
34dc7c2f BB |
247 | |
248 | ASSERT(RW_LOCK_HELD(&zap->zap_rwlock)); | |
249 | ASSERT(tbl->zt_blk != 0); | |
250 | ||
8e739b2c RE |
251 | dprintf("storing %llx at index %llx\n", (u_longlong_t)val, |
252 | (u_longlong_t)idx); | |
34dc7c2f | 253 | |
d2a12f9e MA |
254 | uint64_t blk = idx >> (bs-3); |
255 | uint64_t off = idx & ((1<<(bs-3))-1); | |
34dc7c2f | 256 | |
d2a12f9e | 257 | dmu_buf_t *db; |
80cc5162 | 258 | int err = dmu_buf_hold_by_dnode(zap->zap_dnode, |
428870ff | 259 | (tbl->zt_blk + blk) << bs, FTAG, &db, DMU_READ_NO_PREFETCH); |
d2a12f9e | 260 | if (err != 0) |
34dc7c2f BB |
261 | return (err); |
262 | dmu_buf_will_dirty(db, tx); | |
263 | ||
264 | if (tbl->zt_nextblk != 0) { | |
265 | uint64_t idx2 = idx * 2; | |
266 | uint64_t blk2 = idx2 >> (bs-3); | |
267 | uint64_t off2 = idx2 & ((1<<(bs-3))-1); | |
268 | dmu_buf_t *db2; | |
269 | ||
80cc5162 | 270 | err = dmu_buf_hold_by_dnode(zap->zap_dnode, |
428870ff BB |
271 | (tbl->zt_nextblk + blk2) << bs, FTAG, &db2, |
272 | DMU_READ_NO_PREFETCH); | |
d2a12f9e | 273 | if (err != 0) { |
34dc7c2f BB |
274 | dmu_buf_rele(db, FTAG); |
275 | return (err); | |
276 | } | |
277 | dmu_buf_will_dirty(db2, tx); | |
278 | ((uint64_t *)db2->db_data)[off2] = val; | |
279 | ((uint64_t *)db2->db_data)[off2+1] = val; | |
280 | dmu_buf_rele(db2, FTAG); | |
281 | } | |
282 | ||
283 | ((uint64_t *)db->db_data)[off] = val; | |
284 | dmu_buf_rele(db, FTAG); | |
285 | ||
286 | return (0); | |
287 | } | |
288 | ||
289 | static int | |
290 | zap_table_load(zap_t *zap, zap_table_phys_t *tbl, uint64_t idx, uint64_t *valp) | |
291 | { | |
34dc7c2f BB |
292 | int bs = FZAP_BLOCK_SHIFT(zap); |
293 | ||
294 | ASSERT(RW_LOCK_HELD(&zap->zap_rwlock)); | |
295 | ||
d2a12f9e MA |
296 | uint64_t blk = idx >> (bs-3); |
297 | uint64_t off = idx & ((1<<(bs-3))-1); | |
34dc7c2f | 298 | |
d2a12f9e | 299 | dmu_buf_t *db; |
80cc5162 | 300 | int err = dmu_buf_hold_by_dnode(zap->zap_dnode, |
428870ff | 301 | (tbl->zt_blk + blk) << bs, FTAG, &db, DMU_READ_NO_PREFETCH); |
d2a12f9e | 302 | if (err != 0) |
34dc7c2f BB |
303 | return (err); |
304 | *valp = ((uint64_t *)db->db_data)[off]; | |
305 | dmu_buf_rele(db, FTAG); | |
306 | ||
307 | if (tbl->zt_nextblk != 0) { | |
308 | /* | |
309 | * read the nextblk for the sake of i/o error checking, | |
310 | * so that zap_table_load() will catch errors for | |
311 | * zap_table_store. | |
312 | */ | |
313 | blk = (idx*2) >> (bs-3); | |
314 | ||
80cc5162 | 315 | err = dmu_buf_hold_by_dnode(zap->zap_dnode, |
428870ff BB |
316 | (tbl->zt_nextblk + blk) << bs, FTAG, &db, |
317 | DMU_READ_NO_PREFETCH); | |
3a84951d WA |
318 | if (err == 0) |
319 | dmu_buf_rele(db, FTAG); | |
34dc7c2f BB |
320 | } |
321 | return (err); | |
322 | } | |
323 | ||
324 | /* | |
325 | * Routines for growing the ptrtbl. | |
326 | */ | |
327 | ||
328 | static void | |
329 | zap_ptrtbl_transfer(const uint64_t *src, uint64_t *dst, int n) | |
330 | { | |
d2a12f9e | 331 | for (int i = 0; i < n; i++) { |
34dc7c2f | 332 | uint64_t lb = src[i]; |
d2a12f9e MA |
333 | dst[2 * i + 0] = lb; |
334 | dst[2 * i + 1] = lb; | |
34dc7c2f BB |
335 | } |
336 | } | |
337 | ||
338 | static int | |
339 | zap_grow_ptrtbl(zap_t *zap, dmu_tx_t *tx) | |
340 | { | |
428870ff BB |
341 | /* |
342 | * The pointer table should never use more hash bits than we | |
343 | * have (otherwise we'd be using useless zero bits to index it). | |
344 | * If we are within 2 bits of running out, stop growing, since | |
345 | * this is already an aberrant condition. | |
346 | */ | |
d683ddbb | 347 | if (zap_f_phys(zap)->zap_ptrtbl.zt_shift >= zap_hashbits(zap) - 2) |
2e528b49 | 348 | return (SET_ERROR(ENOSPC)); |
34dc7c2f | 349 | |
d683ddbb | 350 | if (zap_f_phys(zap)->zap_ptrtbl.zt_numblks == 0) { |
34dc7c2f BB |
351 | /* |
352 | * We are outgrowing the "embedded" ptrtbl (the one | |
353 | * stored in the header block). Give it its own entire | |
354 | * block, which will double the size of the ptrtbl. | |
355 | */ | |
d683ddbb | 356 | ASSERT3U(zap_f_phys(zap)->zap_ptrtbl.zt_shift, ==, |
34dc7c2f | 357 | ZAP_EMBEDDED_PTRTBL_SHIFT(zap)); |
d683ddbb | 358 | ASSERT0(zap_f_phys(zap)->zap_ptrtbl.zt_blk); |
34dc7c2f | 359 | |
d2a12f9e MA |
360 | uint64_t newblk = zap_allocate_blocks(zap, 1); |
361 | dmu_buf_t *db_new; | |
80cc5162 | 362 | int err = dmu_buf_hold_by_dnode(zap->zap_dnode, |
428870ff BB |
363 | newblk << FZAP_BLOCK_SHIFT(zap), FTAG, &db_new, |
364 | DMU_READ_NO_PREFETCH); | |
d2a12f9e | 365 | if (err != 0) |
34dc7c2f BB |
366 | return (err); |
367 | dmu_buf_will_dirty(db_new, tx); | |
368 | zap_ptrtbl_transfer(&ZAP_EMBEDDED_PTRTBL_ENT(zap, 0), | |
369 | db_new->db_data, 1 << ZAP_EMBEDDED_PTRTBL_SHIFT(zap)); | |
370 | dmu_buf_rele(db_new, FTAG); | |
371 | ||
d683ddbb JG |
372 | zap_f_phys(zap)->zap_ptrtbl.zt_blk = newblk; |
373 | zap_f_phys(zap)->zap_ptrtbl.zt_numblks = 1; | |
374 | zap_f_phys(zap)->zap_ptrtbl.zt_shift++; | |
34dc7c2f | 375 | |
d683ddbb JG |
376 | ASSERT3U(1ULL << zap_f_phys(zap)->zap_ptrtbl.zt_shift, ==, |
377 | zap_f_phys(zap)->zap_ptrtbl.zt_numblks << | |
34dc7c2f BB |
378 | (FZAP_BLOCK_SHIFT(zap)-3)); |
379 | ||
380 | return (0); | |
381 | } else { | |
d683ddbb | 382 | return (zap_table_grow(zap, &zap_f_phys(zap)->zap_ptrtbl, |
34dc7c2f BB |
383 | zap_ptrtbl_transfer, tx)); |
384 | } | |
385 | } | |
386 | ||
387 | static void | |
388 | zap_increment_num_entries(zap_t *zap, int delta, dmu_tx_t *tx) | |
389 | { | |
390 | dmu_buf_will_dirty(zap->zap_dbuf, tx); | |
391 | mutex_enter(&zap->zap_f.zap_num_entries_mtx); | |
d683ddbb JG |
392 | ASSERT(delta > 0 || zap_f_phys(zap)->zap_num_entries >= -delta); |
393 | zap_f_phys(zap)->zap_num_entries += delta; | |
34dc7c2f BB |
394 | mutex_exit(&zap->zap_f.zap_num_entries_mtx); |
395 | } | |
396 | ||
397 | static uint64_t | |
398 | zap_allocate_blocks(zap_t *zap, int nblocks) | |
399 | { | |
34dc7c2f | 400 | ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); |
d2a12f9e | 401 | uint64_t newblk = zap_f_phys(zap)->zap_freeblk; |
d683ddbb | 402 | zap_f_phys(zap)->zap_freeblk += nblocks; |
34dc7c2f BB |
403 | return (newblk); |
404 | } | |
405 | ||
0c66c32d | 406 | static void |
39efbde7 | 407 | zap_leaf_evict_sync(void *dbu) |
0c66c32d JG |
408 | { |
409 | zap_leaf_t *l = dbu; | |
410 | ||
411 | rw_destroy(&l->l_rwlock); | |
412 | kmem_free(l, sizeof (zap_leaf_t)); | |
413 | } | |
414 | ||
34dc7c2f BB |
415 | static zap_leaf_t * |
416 | zap_create_leaf(zap_t *zap, dmu_tx_t *tx) | |
417 | { | |
0c66c32d | 418 | zap_leaf_t *l = kmem_zalloc(sizeof (zap_leaf_t), KM_SLEEP); |
34dc7c2f BB |
419 | |
420 | ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); | |
421 | ||
448d7aaa | 422 | rw_init(&l->l_rwlock, NULL, RW_NOLOCKDEP, NULL); |
34dc7c2f BB |
423 | rw_enter(&l->l_rwlock, RW_WRITER); |
424 | l->l_blkid = zap_allocate_blocks(zap, 1); | |
425 | l->l_dbuf = NULL; | |
34dc7c2f | 426 | |
80cc5162 | 427 | VERIFY0(dmu_buf_hold_by_dnode(zap->zap_dnode, |
428870ff BB |
428 | l->l_blkid << FZAP_BLOCK_SHIFT(zap), NULL, &l->l_dbuf, |
429 | DMU_READ_NO_PREFETCH)); | |
39efbde7 | 430 | dmu_buf_init_user(&l->l_dbu, zap_leaf_evict_sync, NULL, &l->l_dbuf); |
d2a12f9e | 431 | VERIFY3P(NULL, ==, dmu_buf_set_user(l->l_dbuf, &l->l_dbu)); |
34dc7c2f BB |
432 | dmu_buf_will_dirty(l->l_dbuf, tx); |
433 | ||
434 | zap_leaf_init(l, zap->zap_normflags != 0); | |
435 | ||
d683ddbb | 436 | zap_f_phys(zap)->zap_num_leafs++; |
34dc7c2f BB |
437 | |
438 | return (l); | |
439 | } | |
440 | ||
441 | int | |
442 | fzap_count(zap_t *zap, uint64_t *count) | |
443 | { | |
444 | ASSERT(!zap->zap_ismicro); | |
445 | mutex_enter(&zap->zap_f.zap_num_entries_mtx); /* unnecessary */ | |
d683ddbb | 446 | *count = zap_f_phys(zap)->zap_num_entries; |
34dc7c2f BB |
447 | mutex_exit(&zap->zap_f.zap_num_entries_mtx); |
448 | return (0); | |
449 | } | |
450 | ||
451 | /* | |
452 | * Routines for obtaining zap_leaf_t's | |
453 | */ | |
454 | ||
455 | void | |
456 | zap_put_leaf(zap_leaf_t *l) | |
457 | { | |
458 | rw_exit(&l->l_rwlock); | |
459 | dmu_buf_rele(l->l_dbuf, NULL); | |
460 | } | |
461 | ||
34dc7c2f BB |
462 | static zap_leaf_t * |
463 | zap_open_leaf(uint64_t blkid, dmu_buf_t *db) | |
464 | { | |
34dc7c2f BB |
465 | ASSERT(blkid != 0); |
466 | ||
d2a12f9e | 467 | zap_leaf_t *l = kmem_zalloc(sizeof (zap_leaf_t), KM_SLEEP); |
ef5319df | 468 | rw_init(&l->l_rwlock, NULL, RW_DEFAULT, NULL); |
34dc7c2f BB |
469 | rw_enter(&l->l_rwlock, RW_WRITER); |
470 | l->l_blkid = blkid; | |
9bd274dd | 471 | l->l_bs = highbit64(db->db_size) - 1; |
34dc7c2f | 472 | l->l_dbuf = db; |
34dc7c2f | 473 | |
39efbde7 | 474 | dmu_buf_init_user(&l->l_dbu, zap_leaf_evict_sync, NULL, &l->l_dbuf); |
d2a12f9e | 475 | zap_leaf_t *winner = dmu_buf_set_user(db, &l->l_dbu); |
34dc7c2f BB |
476 | |
477 | rw_exit(&l->l_rwlock); | |
478 | if (winner != NULL) { | |
479 | /* someone else set it first */ | |
39efbde7 | 480 | zap_leaf_evict_sync(&l->l_dbu); |
34dc7c2f BB |
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 | */ | |
d683ddbb | 489 | ASSERT0(zap_leaf_phys(l)->l_hdr.lh_pad1); |
34dc7c2f BB |
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 */ | |
b8864a23 | 498 | ASSERT3P(&ZAP_LEAF_CHUNK(l, 0), ==, (zap_leaf_chunk_t *) |
d683ddbb | 499 | &zap_leaf_phys(l)->l_hash[ZAP_LEAF_HASH_NUMENTRIES(l)]); |
34dc7c2f BB |
500 | |
501 | /* The chunks should end at the end of the block */ | |
502 | ASSERT3U((uintptr_t)&ZAP_LEAF_CHUNK(l, ZAP_LEAF_NUMCHUNKS(l)) - | |
d683ddbb | 503 | (uintptr_t)zap_leaf_phys(l), ==, l->l_dbuf->db_size); |
34dc7c2f BB |
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; | |
34dc7c2f BB |
513 | |
514 | ASSERT(RW_LOCK_HELD(&zap->zap_rwlock)); | |
515 | ||
29572ccd CC |
516 | /* |
517 | * If system crashed just after dmu_free_long_range in zfs_rmnode, we | |
518 | * would be left with an empty xattr dir in delete queue. blkid=0 | |
519 | * would be passed in when doing zfs_purgedir. If that's the case we | |
520 | * should just return immediately. The underlying objects should | |
521 | * already be freed, so this should be perfectly fine. | |
522 | */ | |
523 | if (blkid == 0) | |
ecb2b7dc | 524 | return (SET_ERROR(ENOENT)); |
29572ccd | 525 | |
d2a12f9e | 526 | int bs = FZAP_BLOCK_SHIFT(zap); |
80cc5162 | 527 | int err = dmu_buf_hold_by_dnode(zap->zap_dnode, |
428870ff | 528 | blkid << bs, NULL, &db, DMU_READ_NO_PREFETCH); |
d2a12f9e | 529 | if (err != 0) |
34dc7c2f BB |
530 | return (err); |
531 | ||
532 | ASSERT3U(db->db_object, ==, zap->zap_object); | |
533 | ASSERT3U(db->db_offset, ==, blkid << bs); | |
534 | ASSERT3U(db->db_size, ==, 1 << bs); | |
535 | ASSERT(blkid != 0); | |
536 | ||
d2a12f9e | 537 | zap_leaf_t *l = dmu_buf_get_user(db); |
34dc7c2f BB |
538 | |
539 | if (l == NULL) | |
540 | l = zap_open_leaf(blkid, db); | |
541 | ||
542 | rw_enter(&l->l_rwlock, lt); | |
543 | /* | |
d683ddbb | 544 | * Must lock before dirtying, otherwise zap_leaf_phys(l) could change, |
34dc7c2f BB |
545 | * causing ASSERT below to fail. |
546 | */ | |
547 | if (lt == RW_WRITER) | |
548 | dmu_buf_will_dirty(db, tx); | |
549 | ASSERT3U(l->l_blkid, ==, blkid); | |
550 | ASSERT3P(l->l_dbuf, ==, db); | |
d683ddbb JG |
551 | ASSERT3U(zap_leaf_phys(l)->l_hdr.lh_block_type, ==, ZBT_LEAF); |
552 | ASSERT3U(zap_leaf_phys(l)->l_hdr.lh_magic, ==, ZAP_LEAF_MAGIC); | |
34dc7c2f BB |
553 | |
554 | *lp = l; | |
555 | return (0); | |
556 | } | |
557 | ||
558 | static int | |
559 | zap_idx_to_blk(zap_t *zap, uint64_t idx, uint64_t *valp) | |
560 | { | |
561 | ASSERT(RW_LOCK_HELD(&zap->zap_rwlock)); | |
562 | ||
d683ddbb | 563 | if (zap_f_phys(zap)->zap_ptrtbl.zt_numblks == 0) { |
34dc7c2f | 564 | ASSERT3U(idx, <, |
d683ddbb | 565 | (1ULL << zap_f_phys(zap)->zap_ptrtbl.zt_shift)); |
34dc7c2f BB |
566 | *valp = ZAP_EMBEDDED_PTRTBL_ENT(zap, idx); |
567 | return (0); | |
568 | } else { | |
d683ddbb | 569 | return (zap_table_load(zap, &zap_f_phys(zap)->zap_ptrtbl, |
34dc7c2f BB |
570 | idx, valp)); |
571 | } | |
572 | } | |
573 | ||
574 | static int | |
575 | zap_set_idx_to_blk(zap_t *zap, uint64_t idx, uint64_t blk, dmu_tx_t *tx) | |
576 | { | |
577 | ASSERT(tx != NULL); | |
578 | ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); | |
579 | ||
d683ddbb | 580 | if (zap_f_phys(zap)->zap_ptrtbl.zt_blk == 0) { |
34dc7c2f BB |
581 | ZAP_EMBEDDED_PTRTBL_ENT(zap, idx) = blk; |
582 | return (0); | |
583 | } else { | |
d683ddbb | 584 | return (zap_table_store(zap, &zap_f_phys(zap)->zap_ptrtbl, |
34dc7c2f BB |
585 | idx, blk, tx)); |
586 | } | |
587 | } | |
588 | ||
589 | static int | |
590 | zap_deref_leaf(zap_t *zap, uint64_t h, dmu_tx_t *tx, krw_t lt, zap_leaf_t **lp) | |
591 | { | |
d2a12f9e | 592 | uint64_t blk; |
34dc7c2f BB |
593 | |
594 | ASSERT(zap->zap_dbuf == NULL || | |
d683ddbb | 595 | zap_f_phys(zap) == zap->zap_dbuf->db_data); |
32c8c946 CC |
596 | |
597 | /* Reality check for corrupt zap objects (leaf or header). */ | |
598 | if ((zap_f_phys(zap)->zap_block_type != ZBT_LEAF && | |
599 | zap_f_phys(zap)->zap_block_type != ZBT_HEADER) || | |
600 | zap_f_phys(zap)->zap_magic != ZAP_MAGIC) { | |
601 | return (SET_ERROR(EIO)); | |
602 | } | |
d2a12f9e MA |
603 | |
604 | uint64_t idx = ZAP_HASH_IDX(h, zap_f_phys(zap)->zap_ptrtbl.zt_shift); | |
605 | int err = zap_idx_to_blk(zap, idx, &blk); | |
34dc7c2f BB |
606 | if (err != 0) |
607 | return (err); | |
608 | err = zap_get_leaf_byblk(zap, blk, tx, lt, lp); | |
609 | ||
d683ddbb JG |
610 | ASSERT(err || |
611 | ZAP_HASH_IDX(h, zap_leaf_phys(*lp)->l_hdr.lh_prefix_len) == | |
612 | zap_leaf_phys(*lp)->l_hdr.lh_prefix); | |
34dc7c2f BB |
613 | return (err); |
614 | } | |
615 | ||
616 | static int | |
8bea9815 | 617 | zap_expand_leaf(zap_name_t *zn, zap_leaf_t *l, |
dd66857d | 618 | const void *tag, dmu_tx_t *tx, zap_leaf_t **lp) |
34dc7c2f BB |
619 | { |
620 | zap_t *zap = zn->zn_zap; | |
621 | uint64_t hash = zn->zn_hash; | |
d2a12f9e | 622 | int err; |
d683ddbb | 623 | int old_prefix_len = zap_leaf_phys(l)->l_hdr.lh_prefix_len; |
34dc7c2f | 624 | |
d683ddbb | 625 | ASSERT3U(old_prefix_len, <=, zap_f_phys(zap)->zap_ptrtbl.zt_shift); |
34dc7c2f BB |
626 | ASSERT(RW_LOCK_HELD(&zap->zap_rwlock)); |
627 | ||
628 | ASSERT3U(ZAP_HASH_IDX(hash, old_prefix_len), ==, | |
d683ddbb | 629 | zap_leaf_phys(l)->l_hdr.lh_prefix); |
34dc7c2f BB |
630 | |
631 | if (zap_tryupgradedir(zap, tx) == 0 || | |
d683ddbb | 632 | old_prefix_len == zap_f_phys(zap)->zap_ptrtbl.zt_shift) { |
34dc7c2f BB |
633 | /* We failed to upgrade, or need to grow the pointer table */ |
634 | objset_t *os = zap->zap_objset; | |
635 | uint64_t object = zap->zap_object; | |
636 | ||
637 | zap_put_leaf(l); | |
8bea9815 | 638 | zap_unlockdir(zap, tag); |
34dc7c2f | 639 | err = zap_lockdir(os, object, tx, RW_WRITER, |
8bea9815 | 640 | FALSE, FALSE, tag, &zn->zn_zap); |
34dc7c2f | 641 | zap = zn->zn_zap; |
d2a12f9e | 642 | if (err != 0) |
34dc7c2f BB |
643 | return (err); |
644 | ASSERT(!zap->zap_ismicro); | |
645 | ||
646 | while (old_prefix_len == | |
d683ddbb | 647 | zap_f_phys(zap)->zap_ptrtbl.zt_shift) { |
34dc7c2f | 648 | err = zap_grow_ptrtbl(zap, tx); |
d2a12f9e | 649 | if (err != 0) |
34dc7c2f BB |
650 | return (err); |
651 | } | |
652 | ||
653 | err = zap_deref_leaf(zap, hash, tx, RW_WRITER, &l); | |
d2a12f9e | 654 | if (err != 0) |
34dc7c2f BB |
655 | return (err); |
656 | ||
d683ddbb | 657 | if (zap_leaf_phys(l)->l_hdr.lh_prefix_len != old_prefix_len) { |
34dc7c2f BB |
658 | /* it split while our locks were down */ |
659 | *lp = l; | |
660 | return (0); | |
661 | } | |
662 | } | |
663 | ASSERT(RW_WRITE_HELD(&zap->zap_rwlock)); | |
d683ddbb | 664 | ASSERT3U(old_prefix_len, <, zap_f_phys(zap)->zap_ptrtbl.zt_shift); |
34dc7c2f | 665 | ASSERT3U(ZAP_HASH_IDX(hash, old_prefix_len), ==, |
d683ddbb | 666 | zap_leaf_phys(l)->l_hdr.lh_prefix); |
34dc7c2f | 667 | |
d2a12f9e | 668 | int prefix_diff = zap_f_phys(zap)->zap_ptrtbl.zt_shift - |
34dc7c2f | 669 | (old_prefix_len + 1); |
d2a12f9e MA |
670 | uint64_t sibling = |
671 | (ZAP_HASH_IDX(hash, old_prefix_len + 1) | 1) << prefix_diff; | |
34dc7c2f BB |
672 | |
673 | /* check for i/o errors before doing zap_leaf_split */ | |
d2a12f9e | 674 | for (int i = 0; i < (1ULL << prefix_diff); i++) { |
34dc7c2f | 675 | uint64_t blk; |
d2a12f9e MA |
676 | err = zap_idx_to_blk(zap, sibling + i, &blk); |
677 | if (err != 0) | |
34dc7c2f BB |
678 | return (err); |
679 | ASSERT3U(blk, ==, l->l_blkid); | |
680 | } | |
681 | ||
d2a12f9e | 682 | zap_leaf_t *nl = zap_create_leaf(zap, tx); |
34dc7c2f BB |
683 | zap_leaf_split(l, nl, zap->zap_normflags != 0); |
684 | ||
685 | /* set sibling pointers */ | |
d2a12f9e MA |
686 | for (int i = 0; i < (1ULL << prefix_diff); i++) { |
687 | err = zap_set_idx_to_blk(zap, sibling + i, nl->l_blkid, tx); | |
c99c9001 | 688 | ASSERT0(err); /* we checked for i/o errors above */ |
34dc7c2f BB |
689 | } |
690 | ||
6ca636a1 GN |
691 | ASSERT3U(zap_leaf_phys(l)->l_hdr.lh_prefix_len, >, 0); |
692 | ||
d683ddbb | 693 | if (hash & (1ULL << (64 - zap_leaf_phys(l)->l_hdr.lh_prefix_len))) { |
34dc7c2f BB |
694 | /* we want the sibling */ |
695 | zap_put_leaf(l); | |
696 | *lp = nl; | |
697 | } else { | |
698 | zap_put_leaf(nl); | |
699 | *lp = l; | |
700 | } | |
701 | ||
702 | return (0); | |
703 | } | |
704 | ||
705 | static void | |
8bea9815 | 706 | zap_put_leaf_maybe_grow_ptrtbl(zap_name_t *zn, zap_leaf_t *l, |
dd66857d | 707 | const void *tag, dmu_tx_t *tx) |
34dc7c2f BB |
708 | { |
709 | zap_t *zap = zn->zn_zap; | |
d683ddbb JG |
710 | int shift = zap_f_phys(zap)->zap_ptrtbl.zt_shift; |
711 | int leaffull = (zap_leaf_phys(l)->l_hdr.lh_prefix_len == shift && | |
712 | zap_leaf_phys(l)->l_hdr.lh_nfree < ZAP_LEAF_LOW_WATER); | |
34dc7c2f BB |
713 | |
714 | zap_put_leaf(l); | |
715 | ||
d683ddbb | 716 | if (leaffull || zap_f_phys(zap)->zap_ptrtbl.zt_nextblk) { |
34dc7c2f BB |
717 | /* |
718 | * We are in the middle of growing the pointer table, or | |
719 | * this leaf will soon make us grow it. | |
720 | */ | |
721 | if (zap_tryupgradedir(zap, tx) == 0) { | |
722 | objset_t *os = zap->zap_objset; | |
723 | uint64_t zapobj = zap->zap_object; | |
724 | ||
8bea9815 | 725 | zap_unlockdir(zap, tag); |
d2a12f9e | 726 | int err = zap_lockdir(os, zapobj, tx, |
8bea9815 | 727 | RW_WRITER, FALSE, FALSE, tag, &zn->zn_zap); |
34dc7c2f | 728 | zap = zn->zn_zap; |
d2a12f9e | 729 | if (err != 0) |
34dc7c2f BB |
730 | return; |
731 | } | |
732 | ||
733 | /* could have finished growing while our locks were down */ | |
d683ddbb | 734 | if (zap_f_phys(zap)->zap_ptrtbl.zt_shift == shift) |
34dc7c2f BB |
735 | (void) zap_grow_ptrtbl(zap, tx); |
736 | } | |
737 | } | |
738 | ||
34dc7c2f | 739 | static int |
428870ff | 740 | fzap_checkname(zap_name_t *zn) |
34dc7c2f | 741 | { |
428870ff | 742 | if (zn->zn_key_orig_numints * zn->zn_key_intlen > ZAP_MAXNAMELEN) |
2e528b49 | 743 | return (SET_ERROR(ENAMETOOLONG)); |
428870ff BB |
744 | return (0); |
745 | } | |
34dc7c2f | 746 | |
428870ff BB |
747 | static int |
748 | fzap_checksize(uint64_t integer_size, uint64_t num_integers) | |
749 | { | |
34dc7c2f BB |
750 | /* Only integer sizes supported by C */ |
751 | switch (integer_size) { | |
752 | case 1: | |
753 | case 2: | |
754 | case 4: | |
755 | case 8: | |
756 | break; | |
757 | default: | |
2e528b49 | 758 | return (SET_ERROR(EINVAL)); |
34dc7c2f BB |
759 | } |
760 | ||
761 | if (integer_size * num_integers > ZAP_MAXVALUELEN) | |
ecb2b7dc | 762 | return (SET_ERROR(E2BIG)); |
34dc7c2f BB |
763 | |
764 | return (0); | |
765 | } | |
766 | ||
428870ff BB |
767 | static int |
768 | fzap_check(zap_name_t *zn, uint64_t integer_size, uint64_t num_integers) | |
769 | { | |
d2a12f9e MA |
770 | int err = fzap_checkname(zn); |
771 | if (err != 0) | |
428870ff BB |
772 | return (err); |
773 | return (fzap_checksize(integer_size, num_integers)); | |
774 | } | |
775 | ||
34dc7c2f BB |
776 | /* |
777 | * Routines for manipulating attributes. | |
778 | */ | |
779 | int | |
780 | fzap_lookup(zap_name_t *zn, | |
781 | uint64_t integer_size, uint64_t num_integers, void *buf, | |
782 | char *realname, int rn_len, boolean_t *ncp) | |
783 | { | |
784 | zap_leaf_t *l; | |
34dc7c2f BB |
785 | zap_entry_handle_t zeh; |
786 | ||
d2a12f9e MA |
787 | int err = fzap_checkname(zn); |
788 | if (err != 0) | |
34dc7c2f BB |
789 | return (err); |
790 | ||
791 | err = zap_deref_leaf(zn->zn_zap, zn->zn_hash, NULL, RW_READER, &l); | |
792 | if (err != 0) | |
793 | return (err); | |
794 | err = zap_leaf_lookup(l, zn, &zeh); | |
795 | if (err == 0) { | |
428870ff BB |
796 | if ((err = fzap_checksize(integer_size, num_integers)) != 0) { |
797 | zap_put_leaf(l); | |
798 | return (err); | |
799 | } | |
800 | ||
34dc7c2f | 801 | err = zap_entry_read(&zeh, integer_size, num_integers, buf); |
428870ff | 802 | (void) zap_entry_read_name(zn->zn_zap, &zeh, rn_len, realname); |
34dc7c2f BB |
803 | if (ncp) { |
804 | *ncp = zap_entry_normalization_conflict(&zeh, | |
805 | zn, NULL, zn->zn_zap); | |
806 | } | |
807 | } | |
808 | ||
809 | zap_put_leaf(l); | |
810 | return (err); | |
811 | } | |
812 | ||
813 | int | |
814 | fzap_add_cd(zap_name_t *zn, | |
815 | uint64_t integer_size, uint64_t num_integers, | |
dd66857d | 816 | const void *val, uint32_t cd, const void *tag, dmu_tx_t *tx) |
34dc7c2f BB |
817 | { |
818 | zap_leaf_t *l; | |
819 | int err; | |
820 | zap_entry_handle_t zeh; | |
821 | zap_t *zap = zn->zn_zap; | |
822 | ||
823 | ASSERT(RW_LOCK_HELD(&zap->zap_rwlock)); | |
824 | ASSERT(!zap->zap_ismicro); | |
428870ff | 825 | ASSERT(fzap_check(zn, integer_size, num_integers) == 0); |
34dc7c2f BB |
826 | |
827 | err = zap_deref_leaf(zap, zn->zn_hash, tx, RW_WRITER, &l); | |
828 | if (err != 0) | |
829 | return (err); | |
830 | retry: | |
831 | err = zap_leaf_lookup(l, zn, &zeh); | |
832 | if (err == 0) { | |
2e528b49 | 833 | err = SET_ERROR(EEXIST); |
34dc7c2f BB |
834 | goto out; |
835 | } | |
836 | if (err != ENOENT) | |
837 | goto out; | |
838 | ||
428870ff | 839 | err = zap_entry_create(l, zn, cd, |
34dc7c2f BB |
840 | integer_size, num_integers, val, &zeh); |
841 | ||
842 | if (err == 0) { | |
843 | zap_increment_num_entries(zap, 1, tx); | |
844 | } else if (err == EAGAIN) { | |
8bea9815 | 845 | err = zap_expand_leaf(zn, l, tag, tx, &l); |
34dc7c2f | 846 | zap = zn->zn_zap; /* zap_expand_leaf() may change zap */ |
599b8648 | 847 | if (err == 0) { |
34dc7c2f | 848 | goto retry; |
599b8648 CC |
849 | } else if (err == ENOSPC) { |
850 | /* | |
851 | * If we failed to expand the leaf, then bailout | |
852 | * as there is no point trying | |
853 | * zap_put_leaf_maybe_grow_ptrtbl(). | |
854 | */ | |
855 | return (err); | |
856 | } | |
34dc7c2f BB |
857 | } |
858 | ||
859 | out: | |
860 | if (zap != NULL) | |
8bea9815 | 861 | zap_put_leaf_maybe_grow_ptrtbl(zn, l, tag, tx); |
34dc7c2f BB |
862 | return (err); |
863 | } | |
864 | ||
865 | int | |
866 | fzap_add(zap_name_t *zn, | |
867 | uint64_t integer_size, uint64_t num_integers, | |
dd66857d | 868 | const void *val, const void *tag, dmu_tx_t *tx) |
34dc7c2f | 869 | { |
428870ff | 870 | int err = fzap_check(zn, integer_size, num_integers); |
34dc7c2f BB |
871 | if (err != 0) |
872 | return (err); | |
873 | ||
874 | return (fzap_add_cd(zn, integer_size, num_integers, | |
8bea9815 | 875 | val, ZAP_NEED_CD, tag, tx)); |
34dc7c2f BB |
876 | } |
877 | ||
878 | int | |
879 | fzap_update(zap_name_t *zn, | |
8bea9815 | 880 | int integer_size, uint64_t num_integers, const void *val, |
dd66857d | 881 | const void *tag, dmu_tx_t *tx) |
34dc7c2f BB |
882 | { |
883 | zap_leaf_t *l; | |
d2a12f9e MA |
884 | int err; |
885 | boolean_t create; | |
34dc7c2f BB |
886 | zap_entry_handle_t zeh; |
887 | zap_t *zap = zn->zn_zap; | |
888 | ||
889 | ASSERT(RW_LOCK_HELD(&zap->zap_rwlock)); | |
428870ff | 890 | err = fzap_check(zn, integer_size, num_integers); |
34dc7c2f BB |
891 | if (err != 0) |
892 | return (err); | |
893 | ||
894 | err = zap_deref_leaf(zap, zn->zn_hash, tx, RW_WRITER, &l); | |
895 | if (err != 0) | |
896 | return (err); | |
897 | retry: | |
898 | err = zap_leaf_lookup(l, zn, &zeh); | |
899 | create = (err == ENOENT); | |
900 | ASSERT(err == 0 || err == ENOENT); | |
901 | ||
902 | if (create) { | |
428870ff BB |
903 | err = zap_entry_create(l, zn, ZAP_NEED_CD, |
904 | integer_size, num_integers, val, &zeh); | |
34dc7c2f BB |
905 | if (err == 0) |
906 | zap_increment_num_entries(zap, 1, tx); | |
907 | } else { | |
908 | err = zap_entry_update(&zeh, integer_size, num_integers, val); | |
909 | } | |
910 | ||
911 | if (err == EAGAIN) { | |
8bea9815 | 912 | err = zap_expand_leaf(zn, l, tag, tx, &l); |
34dc7c2f BB |
913 | zap = zn->zn_zap; /* zap_expand_leaf() may change zap */ |
914 | if (err == 0) | |
915 | goto retry; | |
916 | } | |
917 | ||
918 | if (zap != NULL) | |
8bea9815 | 919 | zap_put_leaf_maybe_grow_ptrtbl(zn, l, tag, tx); |
34dc7c2f BB |
920 | return (err); |
921 | } | |
922 | ||
923 | int | |
924 | fzap_length(zap_name_t *zn, | |
925 | uint64_t *integer_size, uint64_t *num_integers) | |
926 | { | |
927 | zap_leaf_t *l; | |
928 | int err; | |
929 | zap_entry_handle_t zeh; | |
930 | ||
931 | err = zap_deref_leaf(zn->zn_zap, zn->zn_hash, NULL, RW_READER, &l); | |
932 | if (err != 0) | |
933 | return (err); | |
934 | err = zap_leaf_lookup(l, zn, &zeh); | |
935 | if (err != 0) | |
936 | goto out; | |
937 | ||
4ef69de3 | 938 | if (integer_size != NULL) |
34dc7c2f | 939 | *integer_size = zeh.zeh_integer_size; |
4ef69de3 | 940 | if (num_integers != NULL) |
34dc7c2f BB |
941 | *num_integers = zeh.zeh_num_integers; |
942 | out: | |
943 | zap_put_leaf(l); | |
944 | return (err); | |
945 | } | |
946 | ||
947 | int | |
948 | fzap_remove(zap_name_t *zn, dmu_tx_t *tx) | |
949 | { | |
950 | zap_leaf_t *l; | |
951 | int err; | |
952 | zap_entry_handle_t zeh; | |
953 | ||
954 | err = zap_deref_leaf(zn->zn_zap, zn->zn_hash, tx, RW_WRITER, &l); | |
955 | if (err != 0) | |
956 | return (err); | |
957 | err = zap_leaf_lookup(l, zn, &zeh); | |
958 | if (err == 0) { | |
959 | zap_entry_remove(&zeh); | |
960 | zap_increment_num_entries(zn->zn_zap, -1, tx); | |
961 | } | |
962 | zap_put_leaf(l); | |
963 | return (err); | |
964 | } | |
965 | ||
428870ff BB |
966 | void |
967 | fzap_prefetch(zap_name_t *zn) | |
968 | { | |
d2a12f9e | 969 | uint64_t blk; |
428870ff | 970 | zap_t *zap = zn->zn_zap; |
428870ff | 971 | |
d2a12f9e | 972 | uint64_t idx = ZAP_HASH_IDX(zn->zn_hash, |
d683ddbb | 973 | zap_f_phys(zap)->zap_ptrtbl.zt_shift); |
428870ff BB |
974 | if (zap_idx_to_blk(zap, idx, &blk) != 0) |
975 | return; | |
d2a12f9e | 976 | int bs = FZAP_BLOCK_SHIFT(zap); |
80cc5162 | 977 | dmu_prefetch_by_dnode(zap->zap_dnode, 0, blk << bs, 1 << bs, |
fcff0f35 | 978 | ZIO_PRIORITY_SYNC_READ); |
428870ff BB |
979 | } |
980 | ||
b128c09f BB |
981 | /* |
982 | * Helper functions for consumers. | |
983 | */ | |
984 | ||
9ae529ec CS |
985 | uint64_t |
986 | zap_create_link(objset_t *os, dmu_object_type_t ot, uint64_t parent_obj, | |
987 | const char *name, dmu_tx_t *tx) | |
50c957f7 NB |
988 | { |
989 | return (zap_create_link_dnsize(os, ot, parent_obj, name, 0, tx)); | |
990 | } | |
991 | ||
992 | uint64_t | |
993 | zap_create_link_dnsize(objset_t *os, dmu_object_type_t ot, uint64_t parent_obj, | |
994 | const char *name, int dnodesize, dmu_tx_t *tx) | |
9ae529ec CS |
995 | { |
996 | uint64_t new_obj; | |
997 | ||
d2a12f9e MA |
998 | new_obj = zap_create_dnsize(os, ot, DMU_OT_NONE, 0, dnodesize, tx); |
999 | VERIFY(new_obj != 0); | |
e0ab3ab5 JS |
1000 | VERIFY0(zap_add(os, parent_obj, name, sizeof (uint64_t), 1, &new_obj, |
1001 | tx)); | |
9ae529ec CS |
1002 | |
1003 | return (new_obj); | |
1004 | } | |
1005 | ||
34dc7c2f BB |
1006 | int |
1007 | zap_value_search(objset_t *os, uint64_t zapobj, uint64_t value, uint64_t mask, | |
1008 | char *name) | |
1009 | { | |
1010 | zap_cursor_t zc; | |
34dc7c2f BB |
1011 | int err; |
1012 | ||
1013 | if (mask == 0) | |
1014 | mask = -1ULL; | |
1015 | ||
d2a12f9e | 1016 | zap_attribute_t *za = kmem_alloc(sizeof (*za), KM_SLEEP); |
34dc7c2f BB |
1017 | for (zap_cursor_init(&zc, os, zapobj); |
1018 | (err = zap_cursor_retrieve(&zc, za)) == 0; | |
1019 | zap_cursor_advance(&zc)) { | |
1020 | if ((za->za_first_integer & mask) == (value & mask)) { | |
c9e319fa | 1021 | (void) strlcpy(name, za->za_name, MAXNAMELEN); |
34dc7c2f BB |
1022 | break; |
1023 | } | |
1024 | } | |
1025 | zap_cursor_fini(&zc); | |
d2a12f9e | 1026 | kmem_free(za, sizeof (*za)); |
34dc7c2f BB |
1027 | return (err); |
1028 | } | |
1029 | ||
b128c09f BB |
1030 | int |
1031 | zap_join(objset_t *os, uint64_t fromobj, uint64_t intoobj, dmu_tx_t *tx) | |
1032 | { | |
1033 | zap_cursor_t zc; | |
d2a12f9e | 1034 | int err = 0; |
b128c09f | 1035 | |
d2a12f9e | 1036 | zap_attribute_t *za = kmem_alloc(sizeof (*za), KM_SLEEP); |
b128c09f | 1037 | for (zap_cursor_init(&zc, os, fromobj); |
d2a12f9e | 1038 | zap_cursor_retrieve(&zc, za) == 0; |
b128c09f | 1039 | (void) zap_cursor_advance(&zc)) { |
d2a12f9e | 1040 | if (za->za_integer_length != 8 || za->za_num_integers != 1) { |
3a84951d WA |
1041 | err = SET_ERROR(EINVAL); |
1042 | break; | |
1043 | } | |
d2a12f9e MA |
1044 | err = zap_add(os, intoobj, za->za_name, |
1045 | 8, 1, &za->za_first_integer, tx); | |
1046 | if (err != 0) | |
3a84951d | 1047 | break; |
b128c09f BB |
1048 | } |
1049 | zap_cursor_fini(&zc); | |
d2a12f9e | 1050 | kmem_free(za, sizeof (*za)); |
3a84951d | 1051 | return (err); |
b128c09f BB |
1052 | } |
1053 | ||
428870ff BB |
1054 | int |
1055 | zap_join_key(objset_t *os, uint64_t fromobj, uint64_t intoobj, | |
1056 | uint64_t value, dmu_tx_t *tx) | |
1057 | { | |
1058 | zap_cursor_t zc; | |
d2a12f9e | 1059 | int err = 0; |
428870ff | 1060 | |
d2a12f9e | 1061 | zap_attribute_t *za = kmem_alloc(sizeof (*za), KM_SLEEP); |
428870ff | 1062 | for (zap_cursor_init(&zc, os, fromobj); |
d2a12f9e | 1063 | zap_cursor_retrieve(&zc, za) == 0; |
428870ff | 1064 | (void) zap_cursor_advance(&zc)) { |
d2a12f9e | 1065 | if (za->za_integer_length != 8 || za->za_num_integers != 1) { |
3a84951d WA |
1066 | err = SET_ERROR(EINVAL); |
1067 | break; | |
1068 | } | |
d2a12f9e | 1069 | err = zap_add(os, intoobj, za->za_name, |
428870ff | 1070 | 8, 1, &value, tx); |
d4a72f23 | 1071 | if (err != 0) |
3a84951d | 1072 | break; |
428870ff BB |
1073 | } |
1074 | zap_cursor_fini(&zc); | |
d2a12f9e | 1075 | kmem_free(za, sizeof (*za)); |
3a84951d | 1076 | return (err); |
428870ff BB |
1077 | } |
1078 | ||
1079 | int | |
1080 | zap_join_increment(objset_t *os, uint64_t fromobj, uint64_t intoobj, | |
1081 | dmu_tx_t *tx) | |
1082 | { | |
1083 | zap_cursor_t zc; | |
d2a12f9e | 1084 | int err = 0; |
428870ff | 1085 | |
d2a12f9e | 1086 | zap_attribute_t *za = kmem_alloc(sizeof (*za), KM_SLEEP); |
428870ff | 1087 | for (zap_cursor_init(&zc, os, fromobj); |
d2a12f9e | 1088 | zap_cursor_retrieve(&zc, za) == 0; |
428870ff BB |
1089 | (void) zap_cursor_advance(&zc)) { |
1090 | uint64_t delta = 0; | |
1091 | ||
d2a12f9e | 1092 | if (za->za_integer_length != 8 || za->za_num_integers != 1) { |
3a84951d WA |
1093 | err = SET_ERROR(EINVAL); |
1094 | break; | |
1095 | } | |
428870ff | 1096 | |
d2a12f9e | 1097 | err = zap_lookup(os, intoobj, za->za_name, 8, 1, &delta); |
428870ff | 1098 | if (err != 0 && err != ENOENT) |
3a84951d | 1099 | break; |
d2a12f9e MA |
1100 | delta += za->za_first_integer; |
1101 | err = zap_update(os, intoobj, za->za_name, 8, 1, &delta, tx); | |
1102 | if (err != 0) | |
3a84951d | 1103 | break; |
428870ff BB |
1104 | } |
1105 | zap_cursor_fini(&zc); | |
d2a12f9e | 1106 | kmem_free(za, sizeof (*za)); |
3a84951d | 1107 | return (err); |
428870ff BB |
1108 | } |
1109 | ||
b128c09f BB |
1110 | int |
1111 | zap_add_int(objset_t *os, uint64_t obj, uint64_t value, dmu_tx_t *tx) | |
1112 | { | |
1113 | char name[20]; | |
1114 | ||
1115 | (void) snprintf(name, sizeof (name), "%llx", (longlong_t)value); | |
1116 | return (zap_add(os, obj, name, 8, 1, &value, tx)); | |
1117 | } | |
1118 | ||
1119 | int | |
1120 | zap_remove_int(objset_t *os, uint64_t obj, uint64_t value, dmu_tx_t *tx) | |
1121 | { | |
1122 | char name[20]; | |
1123 | ||
1124 | (void) snprintf(name, sizeof (name), "%llx", (longlong_t)value); | |
1125 | return (zap_remove(os, obj, name, tx)); | |
1126 | } | |
1127 | ||
1128 | int | |
1129 | zap_lookup_int(objset_t *os, uint64_t obj, uint64_t value) | |
1130 | { | |
1131 | char name[20]; | |
1132 | ||
1133 | (void) snprintf(name, sizeof (name), "%llx", (longlong_t)value); | |
1134 | return (zap_lookup(os, obj, name, 8, 1, &value)); | |
1135 | } | |
34dc7c2f | 1136 | |
428870ff BB |
1137 | int |
1138 | zap_add_int_key(objset_t *os, uint64_t obj, | |
1139 | uint64_t key, uint64_t value, dmu_tx_t *tx) | |
1140 | { | |
1141 | char name[20]; | |
1142 | ||
1143 | (void) snprintf(name, sizeof (name), "%llx", (longlong_t)key); | |
1144 | return (zap_add(os, obj, name, 8, 1, &value, tx)); | |
1145 | } | |
1146 | ||
753c3839 MA |
1147 | int |
1148 | zap_update_int_key(objset_t *os, uint64_t obj, | |
1149 | uint64_t key, uint64_t value, dmu_tx_t *tx) | |
1150 | { | |
1151 | char name[20]; | |
1152 | ||
1153 | (void) snprintf(name, sizeof (name), "%llx", (longlong_t)key); | |
1154 | return (zap_update(os, obj, name, 8, 1, &value, tx)); | |
1155 | } | |
1156 | ||
428870ff BB |
1157 | int |
1158 | zap_lookup_int_key(objset_t *os, uint64_t obj, uint64_t key, uint64_t *valuep) | |
1159 | { | |
1160 | char name[20]; | |
1161 | ||
1162 | (void) snprintf(name, sizeof (name), "%llx", (longlong_t)key); | |
1163 | return (zap_lookup(os, obj, name, 8, 1, valuep)); | |
1164 | } | |
1165 | ||
1166 | int | |
1167 | zap_increment(objset_t *os, uint64_t obj, const char *name, int64_t delta, | |
1168 | dmu_tx_t *tx) | |
1169 | { | |
1170 | uint64_t value = 0; | |
428870ff BB |
1171 | |
1172 | if (delta == 0) | |
1173 | return (0); | |
1174 | ||
d2a12f9e | 1175 | int err = zap_lookup(os, obj, name, 8, 1, &value); |
428870ff BB |
1176 | if (err != 0 && err != ENOENT) |
1177 | return (err); | |
1178 | value += delta; | |
1179 | if (value == 0) | |
1180 | err = zap_remove(os, obj, name, tx); | |
1181 | else | |
1182 | err = zap_update(os, obj, name, 8, 1, &value, tx); | |
1183 | return (err); | |
1184 | } | |
1185 | ||
1186 | int | |
1187 | zap_increment_int(objset_t *os, uint64_t obj, uint64_t key, int64_t delta, | |
1188 | dmu_tx_t *tx) | |
1189 | { | |
1190 | char name[20]; | |
1191 | ||
1192 | (void) snprintf(name, sizeof (name), "%llx", (longlong_t)key); | |
1193 | return (zap_increment(os, obj, name, delta, tx)); | |
1194 | } | |
1195 | ||
34dc7c2f BB |
1196 | /* |
1197 | * Routines for iterating over the attributes. | |
1198 | */ | |
1199 | ||
1200 | int | |
1201 | fzap_cursor_retrieve(zap_t *zap, zap_cursor_t *zc, zap_attribute_t *za) | |
1202 | { | |
1203 | int err = ENOENT; | |
1204 | zap_entry_handle_t zeh; | |
1205 | zap_leaf_t *l; | |
1206 | ||
1207 | /* retrieve the next entry at or after zc_hash/zc_cd */ | |
1208 | /* if no entry, return ENOENT */ | |
1209 | ||
d9b4bf06 MA |
1210 | /* |
1211 | * If we are reading from the beginning, we're almost certain to | |
1212 | * iterate over the entire ZAP object. If there are multiple leaf | |
1213 | * blocks (freeblk > 2), prefetch the whole object (up to | |
1214 | * dmu_prefetch_max bytes), so that we read the leaf blocks | |
1215 | * concurrently. (Unless noprefetch was requested via | |
1216 | * zap_cursor_init_noprefetch()). | |
1217 | */ | |
1218 | if (zc->zc_hash == 0 && zap_iterate_prefetch && | |
1219 | zc->zc_prefetch && zap_f_phys(zap)->zap_freeblk > 2) { | |
80cc5162 | 1220 | dmu_prefetch_by_dnode(zap->zap_dnode, 0, 0, |
d9b4bf06 MA |
1221 | zap_f_phys(zap)->zap_freeblk << FZAP_BLOCK_SHIFT(zap), |
1222 | ZIO_PRIORITY_ASYNC_READ); | |
1223 | } | |
1224 | ||
34dc7c2f BB |
1225 | if (zc->zc_leaf && |
1226 | (ZAP_HASH_IDX(zc->zc_hash, | |
d683ddbb JG |
1227 | zap_leaf_phys(zc->zc_leaf)->l_hdr.lh_prefix_len) != |
1228 | zap_leaf_phys(zc->zc_leaf)->l_hdr.lh_prefix)) { | |
34dc7c2f BB |
1229 | rw_enter(&zc->zc_leaf->l_rwlock, RW_READER); |
1230 | zap_put_leaf(zc->zc_leaf); | |
1231 | zc->zc_leaf = NULL; | |
1232 | } | |
1233 | ||
1234 | again: | |
1235 | if (zc->zc_leaf == NULL) { | |
1236 | err = zap_deref_leaf(zap, zc->zc_hash, NULL, RW_READER, | |
1237 | &zc->zc_leaf); | |
1238 | if (err != 0) | |
1239 | return (err); | |
1240 | } else { | |
1241 | rw_enter(&zc->zc_leaf->l_rwlock, RW_READER); | |
1242 | } | |
1243 | l = zc->zc_leaf; | |
1244 | ||
1245 | err = zap_leaf_lookup_closest(l, zc->zc_hash, zc->zc_cd, &zeh); | |
1246 | ||
1247 | if (err == ENOENT) { | |
6ca636a1 | 1248 | if (zap_leaf_phys(l)->l_hdr.lh_prefix_len == 0) { |
34dc7c2f | 1249 | zc->zc_hash = -1ULL; |
6ca636a1 | 1250 | zc->zc_cd = 0; |
34dc7c2f | 1251 | } else { |
6ca636a1 GN |
1252 | uint64_t nocare = (1ULL << |
1253 | (64 - zap_leaf_phys(l)->l_hdr.lh_prefix_len)) - 1; | |
1254 | ||
1255 | zc->zc_hash = (zc->zc_hash & ~nocare) + nocare + 1; | |
1256 | zc->zc_cd = 0; | |
1257 | ||
1258 | if (zc->zc_hash == 0) { | |
1259 | zc->zc_hash = -1ULL; | |
1260 | } else { | |
1261 | zap_put_leaf(zc->zc_leaf); | |
1262 | zc->zc_leaf = NULL; | |
1263 | goto again; | |
1264 | } | |
34dc7c2f BB |
1265 | } |
1266 | } | |
1267 | ||
1268 | if (err == 0) { | |
1269 | zc->zc_hash = zeh.zeh_hash; | |
1270 | zc->zc_cd = zeh.zeh_cd; | |
1271 | za->za_integer_length = zeh.zeh_integer_size; | |
1272 | za->za_num_integers = zeh.zeh_num_integers; | |
1273 | if (zeh.zeh_num_integers == 0) { | |
1274 | za->za_first_integer = 0; | |
1275 | } else { | |
1276 | err = zap_entry_read(&zeh, 8, 1, &za->za_first_integer); | |
1277 | ASSERT(err == 0 || err == EOVERFLOW); | |
1278 | } | |
428870ff | 1279 | err = zap_entry_read_name(zap, &zeh, |
34dc7c2f BB |
1280 | sizeof (za->za_name), za->za_name); |
1281 | ASSERT(err == 0); | |
1282 | ||
1283 | za->za_normalization_conflict = | |
1284 | zap_entry_normalization_conflict(&zeh, | |
1285 | NULL, za->za_name, zap); | |
1286 | } | |
1287 | rw_exit(&zc->zc_leaf->l_rwlock); | |
1288 | return (err); | |
1289 | } | |
1290 | ||
34dc7c2f BB |
1291 | static void |
1292 | zap_stats_ptrtbl(zap_t *zap, uint64_t *tbl, int len, zap_stats_t *zs) | |
1293 | { | |
34dc7c2f BB |
1294 | uint64_t lastblk = 0; |
1295 | ||
1296 | /* | |
1297 | * NB: if a leaf has more pointers than an entire ptrtbl block | |
1298 | * can hold, then it'll be accounted for more than once, since | |
1299 | * we won't have lastblk. | |
1300 | */ | |
d2a12f9e | 1301 | for (int i = 0; i < len; i++) { |
34dc7c2f BB |
1302 | zap_leaf_t *l; |
1303 | ||
1304 | if (tbl[i] == lastblk) | |
1305 | continue; | |
1306 | lastblk = tbl[i]; | |
1307 | ||
d2a12f9e | 1308 | int err = zap_get_leaf_byblk(zap, tbl[i], NULL, RW_READER, &l); |
34dc7c2f BB |
1309 | if (err == 0) { |
1310 | zap_leaf_stats(zap, l, zs); | |
1311 | zap_put_leaf(l); | |
1312 | } | |
1313 | } | |
1314 | } | |
1315 | ||
1316 | void | |
1317 | fzap_get_stats(zap_t *zap, zap_stats_t *zs) | |
1318 | { | |
1319 | int bs = FZAP_BLOCK_SHIFT(zap); | |
1320 | zs->zs_blocksize = 1ULL << bs; | |
1321 | ||
1322 | /* | |
1323 | * Set zap_phys_t fields | |
1324 | */ | |
d683ddbb JG |
1325 | zs->zs_num_leafs = zap_f_phys(zap)->zap_num_leafs; |
1326 | zs->zs_num_entries = zap_f_phys(zap)->zap_num_entries; | |
1327 | zs->zs_num_blocks = zap_f_phys(zap)->zap_freeblk; | |
1328 | zs->zs_block_type = zap_f_phys(zap)->zap_block_type; | |
1329 | zs->zs_magic = zap_f_phys(zap)->zap_magic; | |
1330 | zs->zs_salt = zap_f_phys(zap)->zap_salt; | |
34dc7c2f BB |
1331 | |
1332 | /* | |
1333 | * Set zap_ptrtbl fields | |
1334 | */ | |
d683ddbb JG |
1335 | zs->zs_ptrtbl_len = 1ULL << zap_f_phys(zap)->zap_ptrtbl.zt_shift; |
1336 | zs->zs_ptrtbl_nextblk = zap_f_phys(zap)->zap_ptrtbl.zt_nextblk; | |
34dc7c2f | 1337 | zs->zs_ptrtbl_blks_copied = |
d683ddbb JG |
1338 | zap_f_phys(zap)->zap_ptrtbl.zt_blks_copied; |
1339 | zs->zs_ptrtbl_zt_blk = zap_f_phys(zap)->zap_ptrtbl.zt_blk; | |
1340 | zs->zs_ptrtbl_zt_numblks = zap_f_phys(zap)->zap_ptrtbl.zt_numblks; | |
1341 | zs->zs_ptrtbl_zt_shift = zap_f_phys(zap)->zap_ptrtbl.zt_shift; | |
34dc7c2f | 1342 | |
d683ddbb | 1343 | if (zap_f_phys(zap)->zap_ptrtbl.zt_numblks == 0) { |
34dc7c2f BB |
1344 | /* the ptrtbl is entirely in the header block. */ |
1345 | zap_stats_ptrtbl(zap, &ZAP_EMBEDDED_PTRTBL_ENT(zap, 0), | |
1346 | 1 << ZAP_EMBEDDED_PTRTBL_SHIFT(zap), zs); | |
1347 | } else { | |
80cc5162 | 1348 | dmu_prefetch_by_dnode(zap->zap_dnode, 0, |
d683ddbb | 1349 | zap_f_phys(zap)->zap_ptrtbl.zt_blk << bs, |
fcff0f35 PD |
1350 | zap_f_phys(zap)->zap_ptrtbl.zt_numblks << bs, |
1351 | ZIO_PRIORITY_SYNC_READ); | |
34dc7c2f | 1352 | |
d2a12f9e | 1353 | for (int b = 0; b < zap_f_phys(zap)->zap_ptrtbl.zt_numblks; |
34dc7c2f BB |
1354 | b++) { |
1355 | dmu_buf_t *db; | |
1356 | int err; | |
1357 | ||
80cc5162 | 1358 | err = dmu_buf_hold_by_dnode(zap->zap_dnode, |
d683ddbb | 1359 | (zap_f_phys(zap)->zap_ptrtbl.zt_blk + b) << bs, |
428870ff | 1360 | FTAG, &db, DMU_READ_NO_PREFETCH); |
34dc7c2f BB |
1361 | if (err == 0) { |
1362 | zap_stats_ptrtbl(zap, db->db_data, | |
1363 | 1<<(bs-3), zs); | |
1364 | dmu_buf_rele(db, FTAG); | |
1365 | } | |
1366 | } | |
1367 | } | |
1368 | } | |
d9b4bf06 | 1369 | |
7ada752a | 1370 | /* CSTYLED */ |
03fdcb9a | 1371 | ZFS_MODULE_PARAM(zfs, , zap_iterate_prefetch, INT, ZMOD_RW, |
d9b4bf06 | 1372 | "When iterating ZAP object, prefetch it"); |