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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 | |
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 | /* | |
428870ff | 22 | * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
34dc7c2f BB |
23 | */ |
24 | ||
34dc7c2f BB |
25 | #include <sys/zfs_context.h> |
26 | #include <sys/dmu_objset.h> | |
27 | #include <sys/dmu_traverse.h> | |
28 | #include <sys/dsl_dataset.h> | |
29 | #include <sys/dsl_dir.h> | |
30 | #include <sys/dsl_pool.h> | |
31 | #include <sys/dnode.h> | |
32 | #include <sys/spa.h> | |
33 | #include <sys/zio.h> | |
34 | #include <sys/dmu_impl.h> | |
428870ff BB |
35 | #include <sys/sa.h> |
36 | #include <sys/sa_impl.h> | |
b128c09f BB |
37 | #include <sys/callb.h> |
38 | ||
572e2857 BB |
39 | int zfs_pd_blks_max = 100; |
40 | ||
41 | typedef struct prefetch_data { | |
b128c09f BB |
42 | kmutex_t pd_mtx; |
43 | kcondvar_t pd_cv; | |
44 | int pd_blks_max; | |
45 | int pd_blks_fetched; | |
46 | int pd_flags; | |
47 | boolean_t pd_cancel; | |
48 | boolean_t pd_exited; | |
572e2857 | 49 | } prefetch_data_t; |
b128c09f | 50 | |
572e2857 | 51 | typedef struct traverse_data { |
b128c09f BB |
52 | spa_t *td_spa; |
53 | uint64_t td_objset; | |
54 | blkptr_t *td_rootbp; | |
55 | uint64_t td_min_txg; | |
56 | int td_flags; | |
572e2857 | 57 | prefetch_data_t *td_pfd; |
b128c09f BB |
58 | blkptr_cb_t *td_func; |
59 | void *td_arg; | |
572e2857 | 60 | } traverse_data_t; |
34dc7c2f | 61 | |
572e2857 | 62 | static int traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp, |
9babb374 BB |
63 | arc_buf_t *buf, uint64_t objset, uint64_t object); |
64 | ||
428870ff | 65 | static int |
34dc7c2f BB |
66 | traverse_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg) |
67 | { | |
572e2857 | 68 | traverse_data_t *td = arg; |
b128c09f | 69 | zbookmark_t zb; |
34dc7c2f | 70 | |
b128c09f | 71 | if (bp->blk_birth == 0) |
428870ff | 72 | return (0); |
34dc7c2f | 73 | |
b128c09f | 74 | if (claim_txg == 0 && bp->blk_birth >= spa_first_txg(td->td_spa)) |
428870ff BB |
75 | return (0); |
76 | ||
77 | SET_BOOKMARK(&zb, td->td_objset, ZB_ZIL_OBJECT, ZB_ZIL_LEVEL, | |
78 | bp->blk_cksum.zc_word[ZIL_ZC_SEQ]); | |
79 | ||
80 | (void) td->td_func(td->td_spa, zilog, bp, NULL, &zb, NULL, td->td_arg); | |
b128c09f | 81 | |
428870ff | 82 | return (0); |
34dc7c2f BB |
83 | } |
84 | ||
428870ff | 85 | static int |
34dc7c2f BB |
86 | traverse_zil_record(zilog_t *zilog, lr_t *lrc, void *arg, uint64_t claim_txg) |
87 | { | |
572e2857 | 88 | traverse_data_t *td = arg; |
34dc7c2f BB |
89 | |
90 | if (lrc->lrc_txtype == TX_WRITE) { | |
91 | lr_write_t *lr = (lr_write_t *)lrc; | |
92 | blkptr_t *bp = &lr->lr_blkptr; | |
b128c09f | 93 | zbookmark_t zb; |
34dc7c2f | 94 | |
b128c09f | 95 | if (bp->blk_birth == 0) |
428870ff | 96 | return (0); |
34dc7c2f | 97 | |
b128c09f | 98 | if (claim_txg == 0 || bp->blk_birth < claim_txg) |
428870ff | 99 | return (0); |
b128c09f | 100 | |
572e2857 BB |
101 | SET_BOOKMARK(&zb, td->td_objset, lr->lr_foid, |
102 | ZB_ZIL_LEVEL, lr->lr_offset / BP_GET_LSIZE(bp)); | |
428870ff BB |
103 | |
104 | (void) td->td_func(td->td_spa, zilog, bp, NULL, &zb, NULL, | |
105 | td->td_arg); | |
34dc7c2f | 106 | } |
428870ff | 107 | return (0); |
34dc7c2f BB |
108 | } |
109 | ||
110 | static void | |
572e2857 | 111 | traverse_zil(traverse_data_t *td, zil_header_t *zh) |
34dc7c2f | 112 | { |
34dc7c2f BB |
113 | uint64_t claim_txg = zh->zh_claim_txg; |
114 | zilog_t *zilog; | |
115 | ||
34dc7c2f BB |
116 | /* |
117 | * We only want to visit blocks that have been claimed but not yet | |
428870ff | 118 | * replayed; plus, in read-only mode, blocks that are already stable. |
34dc7c2f | 119 | */ |
fb5f0bc8 | 120 | if (claim_txg == 0 && spa_writeable(td->td_spa)) |
34dc7c2f BB |
121 | return; |
122 | ||
b128c09f | 123 | zilog = zil_alloc(spa_get_dsl(td->td_spa)->dp_meta_objset, zh); |
34dc7c2f | 124 | |
b128c09f | 125 | (void) zil_parse(zilog, traverse_zil_block, traverse_zil_record, td, |
34dc7c2f BB |
126 | claim_txg); |
127 | ||
128 | zil_free(zilog); | |
129 | } | |
130 | ||
c7f8f831 BB |
131 | static int |
132 | traverse_visitbp(traverse_data_t *td, const dnode_phys_t *dnp, | |
133 | arc_buf_t *pbuf, blkptr_t *bp, const zbookmark_t *zb) | |
6656bf56 | 134 | { |
c7f8f831 BB |
135 | zbookmark_t czb; |
136 | int err = 0, lasterr = 0; | |
137 | arc_buf_t *buf = NULL; | |
138 | prefetch_data_t *pd = td->td_pfd; | |
139 | boolean_t hard = td->td_flags & TRAVERSE_HARD; | |
6656bf56 | 140 | |
c7f8f831 BB |
141 | if (bp->blk_birth == 0) { |
142 | err = td->td_func(td->td_spa, NULL, NULL, pbuf, zb, dnp, | |
143 | td->td_arg); | |
144 | return (err); | |
34dc7c2f BB |
145 | } |
146 | ||
c7f8f831 | 147 | if (bp->blk_birth <= td->td_min_txg) |
b128c09f | 148 | return (0); |
34dc7c2f | 149 | |
c7f8f831 BB |
150 | if (pd && !pd->pd_exited && |
151 | ((pd->pd_flags & TRAVERSE_PREFETCH_DATA) || | |
152 | BP_GET_TYPE(bp) == DMU_OT_DNODE || BP_GET_LEVEL(bp) > 0)) { | |
153 | mutex_enter(&pd->pd_mtx); | |
154 | ASSERT(pd->pd_blks_fetched >= 0); | |
155 | while (pd->pd_blks_fetched == 0 && !pd->pd_exited) | |
156 | cv_wait(&pd->pd_cv, &pd->pd_mtx); | |
157 | pd->pd_blks_fetched--; | |
158 | cv_broadcast(&pd->pd_cv); | |
159 | mutex_exit(&pd->pd_mtx); | |
34dc7c2f BB |
160 | } |
161 | ||
c7f8f831 BB |
162 | if (td->td_flags & TRAVERSE_PRE) { |
163 | err = td->td_func(td->td_spa, NULL, bp, pbuf, zb, dnp, | |
164 | td->td_arg); | |
165 | if (err == TRAVERSE_VISIT_NO_CHILDREN) | |
572e2857 | 166 | return (0); |
c7f8f831 BB |
167 | if (err) |
168 | return (err); | |
34dc7c2f BB |
169 | } |
170 | ||
c7f8f831 BB |
171 | if (BP_GET_LEVEL(bp) > 0) { |
172 | uint32_t flags = ARC_WAIT; | |
173 | int i; | |
174 | blkptr_t *cbp; | |
175 | int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT; | |
b128c09f | 176 | |
c7f8f831 BB |
177 | err = dsl_read(NULL, td->td_spa, bp, pbuf, |
178 | arc_getbuf_func, &buf, | |
179 | ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); | |
180 | if (err) | |
181 | return (err); | |
b128c09f BB |
182 | |
183 | /* recursively visitbp() blocks below this */ | |
c7f8f831 BB |
184 | cbp = buf->b_data; |
185 | for (i = 0; i < epb; i++, cbp++) { | |
186 | SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object, | |
187 | zb->zb_level - 1, | |
188 | zb->zb_blkid * epb + i); | |
189 | err = traverse_visitbp(td, dnp, buf, cbp, &czb); | |
190 | if (err) { | |
191 | if (!hard) | |
428870ff | 192 | break; |
c7f8f831 | 193 | lasterr = err; |
428870ff | 194 | } |
b128c09f | 195 | } |
c7f8f831 BB |
196 | } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) { |
197 | uint32_t flags = ARC_WAIT; | |
198 | int i; | |
199 | int epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT; | |
b128c09f | 200 | |
c7f8f831 BB |
201 | err = dsl_read(NULL, td->td_spa, bp, pbuf, |
202 | arc_getbuf_func, &buf, | |
203 | ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); | |
204 | if (err) | |
205 | return (err); | |
b128c09f BB |
206 | |
207 | /* recursively visitbp() blocks below this */ | |
c7f8f831 BB |
208 | dnp = buf->b_data; |
209 | for (i = 0; i < epb; i++, dnp++) { | |
210 | err = traverse_dnode(td, dnp, buf, zb->zb_objset, | |
211 | zb->zb_blkid * epb + i); | |
212 | if (err) { | |
213 | if (!hard) | |
428870ff | 214 | break; |
c7f8f831 | 215 | lasterr = err; |
428870ff | 216 | } |
34dc7c2f | 217 | } |
c7f8f831 BB |
218 | } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) { |
219 | uint32_t flags = ARC_WAIT; | |
220 | objset_phys_t *osp; | |
221 | dnode_phys_t *dnp; | |
222 | ||
223 | err = dsl_read_nolock(NULL, td->td_spa, bp, | |
224 | arc_getbuf_func, &buf, | |
225 | ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); | |
226 | if (err) | |
227 | return (err); | |
228 | ||
229 | osp = buf->b_data; | |
230 | dnp = &osp->os_meta_dnode; | |
231 | err = traverse_dnode(td, dnp, buf, zb->zb_objset, | |
232 | DMU_META_DNODE_OBJECT); | |
233 | if (err && hard) { | |
234 | lasterr = err; | |
235 | err = 0; | |
428870ff | 236 | } |
c7f8f831 BB |
237 | if (err == 0 && arc_buf_size(buf) >= sizeof (objset_phys_t)) { |
238 | dnp = &osp->os_userused_dnode; | |
239 | err = traverse_dnode(td, dnp, buf, zb->zb_objset, | |
9babb374 BB |
240 | DMU_USERUSED_OBJECT); |
241 | } | |
c7f8f831 BB |
242 | if (err && hard) { |
243 | lasterr = err; | |
244 | err = 0; | |
428870ff | 245 | } |
c7f8f831 BB |
246 | if (err == 0 && arc_buf_size(buf) >= sizeof (objset_phys_t)) { |
247 | dnp = &osp->os_groupused_dnode; | |
248 | err = traverse_dnode(td, dnp, buf, zb->zb_objset, | |
9babb374 | 249 | DMU_GROUPUSED_OBJECT); |
34dc7c2f | 250 | } |
34dc7c2f BB |
251 | } |
252 | ||
c7f8f831 BB |
253 | if (buf) |
254 | (void) arc_buf_remove_ref(buf, &buf); | |
34dc7c2f | 255 | |
c7f8f831 BB |
256 | if (err == 0 && lasterr == 0 && (td->td_flags & TRAVERSE_POST)) { |
257 | err = td->td_func(td->td_spa, NULL, bp, pbuf, zb, dnp, | |
258 | td->td_arg); | |
428870ff | 259 | } |
34dc7c2f | 260 | |
c7f8f831 | 261 | return (err != 0 ? err : lasterr); |
34dc7c2f BB |
262 | } |
263 | ||
9babb374 | 264 | static int |
572e2857 | 265 | traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp, |
9babb374 BB |
266 | arc_buf_t *buf, uint64_t objset, uint64_t object) |
267 | { | |
428870ff | 268 | int j, err = 0, lasterr = 0; |
9babb374 | 269 | zbookmark_t czb; |
428870ff | 270 | boolean_t hard = (td->td_flags & TRAVERSE_HARD); |
9babb374 BB |
271 | |
272 | for (j = 0; j < dnp->dn_nblkptr; j++) { | |
273 | SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j); | |
274 | err = traverse_visitbp(td, dnp, buf, | |
275 | (blkptr_t *)&dnp->dn_blkptr[j], &czb); | |
428870ff BB |
276 | if (err) { |
277 | if (!hard) | |
278 | break; | |
279 | lasterr = err; | |
280 | } | |
9babb374 | 281 | } |
428870ff BB |
282 | |
283 | if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) { | |
284 | SET_BOOKMARK(&czb, objset, | |
285 | object, 0, DMU_SPILL_BLKID); | |
286 | err = traverse_visitbp(td, dnp, buf, | |
287 | (blkptr_t *)&dnp->dn_spill, &czb); | |
288 | if (err) { | |
289 | if (!hard) | |
290 | return (err); | |
291 | lasterr = err; | |
292 | } | |
293 | } | |
294 | return (err != 0 ? err : lasterr); | |
9babb374 BB |
295 | } |
296 | ||
b128c09f BB |
297 | /* ARGSUSED */ |
298 | static int | |
428870ff BB |
299 | traverse_prefetcher(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, |
300 | arc_buf_t *pbuf, const zbookmark_t *zb, const dnode_phys_t *dnp, | |
301 | void *arg) | |
34dc7c2f | 302 | { |
572e2857 | 303 | prefetch_data_t *pfd = arg; |
b128c09f | 304 | uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH; |
34dc7c2f | 305 | |
b128c09f BB |
306 | ASSERT(pfd->pd_blks_fetched >= 0); |
307 | if (pfd->pd_cancel) | |
308 | return (EINTR); | |
34dc7c2f | 309 | |
b128c09f | 310 | if (bp == NULL || !((pfd->pd_flags & TRAVERSE_PREFETCH_DATA) || |
428870ff BB |
311 | BP_GET_TYPE(bp) == DMU_OT_DNODE || BP_GET_LEVEL(bp) > 0) || |
312 | BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG) | |
34dc7c2f BB |
313 | return (0); |
314 | ||
b128c09f BB |
315 | mutex_enter(&pfd->pd_mtx); |
316 | while (!pfd->pd_cancel && pfd->pd_blks_fetched >= pfd->pd_blks_max) | |
317 | cv_wait(&pfd->pd_cv, &pfd->pd_mtx); | |
318 | pfd->pd_blks_fetched++; | |
319 | cv_broadcast(&pfd->pd_cv); | |
320 | mutex_exit(&pfd->pd_mtx); | |
34dc7c2f | 321 | |
428870ff | 322 | (void) dsl_read(NULL, spa, bp, pbuf, NULL, NULL, |
b128c09f BB |
323 | ZIO_PRIORITY_ASYNC_READ, |
324 | ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, | |
325 | &aflags, zb); | |
34dc7c2f | 326 | |
b128c09f | 327 | return (0); |
34dc7c2f BB |
328 | } |
329 | ||
34dc7c2f | 330 | static void |
b128c09f | 331 | traverse_prefetch_thread(void *arg) |
34dc7c2f | 332 | { |
572e2857 BB |
333 | traverse_data_t *td_main = arg; |
334 | traverse_data_t td = *td_main; | |
b128c09f | 335 | zbookmark_t czb; |
34dc7c2f | 336 | |
b128c09f BB |
337 | td.td_func = traverse_prefetcher; |
338 | td.td_arg = td_main->td_pfd; | |
339 | td.td_pfd = NULL; | |
34dc7c2f | 340 | |
428870ff BB |
341 | SET_BOOKMARK(&czb, td.td_objset, |
342 | ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); | |
b128c09f | 343 | (void) traverse_visitbp(&td, NULL, NULL, td.td_rootbp, &czb); |
34dc7c2f | 344 | |
b128c09f BB |
345 | mutex_enter(&td_main->td_pfd->pd_mtx); |
346 | td_main->td_pfd->pd_exited = B_TRUE; | |
347 | cv_broadcast(&td_main->td_pfd->pd_cv); | |
348 | mutex_exit(&td_main->td_pfd->pd_mtx); | |
34dc7c2f BB |
349 | } |
350 | ||
b128c09f BB |
351 | /* |
352 | * NB: dataset must not be changing on-disk (eg, is a snapshot or we are | |
353 | * in syncing context). | |
354 | */ | |
355 | static int | |
572e2857 | 356 | traverse_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *rootbp, |
b128c09f | 357 | uint64_t txg_start, int flags, blkptr_cb_t func, void *arg) |
34dc7c2f | 358 | { |
47050a88 BB |
359 | traverse_data_t *td; |
360 | prefetch_data_t *pd; | |
361 | zbookmark_t *czb; | |
b128c09f | 362 | int err; |
34dc7c2f | 363 | |
47050a88 BB |
364 | td = kmem_alloc(sizeof(traverse_data_t), KM_SLEEP); |
365 | pd = kmem_zalloc(sizeof(prefetch_data_t), KM_SLEEP); | |
366 | czb = kmem_alloc(sizeof(zbookmark_t), KM_SLEEP); | |
367 | ||
368 | td->td_spa = spa; | |
369 | td->td_objset = ds ? ds->ds_object : 0; | |
370 | td->td_rootbp = rootbp; | |
371 | td->td_min_txg = txg_start; | |
372 | td->td_func = func; | |
373 | td->td_arg = arg; | |
374 | td->td_pfd = pd; | |
375 | td->td_flags = flags; | |
b128c09f | 376 | |
47050a88 BB |
377 | pd->pd_blks_max = zfs_pd_blks_max; |
378 | pd->pd_flags = flags; | |
379 | mutex_init(&pd->pd_mtx, NULL, MUTEX_DEFAULT, NULL); | |
380 | cv_init(&pd->pd_cv, NULL, CV_DEFAULT, NULL); | |
b128c09f | 381 | |
572e2857 BB |
382 | /* See comment on ZIL traversal in dsl_scan_visitds. */ |
383 | if (ds != NULL && !dsl_dataset_is_snapshot(ds)) { | |
384 | objset_t *os; | |
385 | ||
386 | err = dmu_objset_from_ds(ds, &os); | |
387 | if (err) | |
388 | return (err); | |
389 | ||
47050a88 | 390 | traverse_zil(td, &os->os_zil_header); |
572e2857 BB |
391 | } |
392 | ||
b128c09f BB |
393 | if (!(flags & TRAVERSE_PREFETCH) || |
394 | 0 == taskq_dispatch(system_taskq, traverse_prefetch_thread, | |
47050a88 BB |
395 | td, TQ_NOQUEUE)) |
396 | pd->pd_exited = B_TRUE; | |
b128c09f | 397 | |
47050a88 | 398 | SET_BOOKMARK(czb, td->td_objset, |
428870ff | 399 | ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); |
47050a88 BB |
400 | err = traverse_visitbp(td, NULL, NULL, rootbp, czb); |
401 | ||
402 | mutex_enter(&pd->pd_mtx); | |
403 | pd->pd_cancel = B_TRUE; | |
404 | cv_broadcast(&pd->pd_cv); | |
405 | while (!pd->pd_exited) | |
406 | cv_wait(&pd->pd_cv, &pd->pd_mtx); | |
407 | mutex_exit(&pd->pd_mtx); | |
b128c09f | 408 | |
47050a88 BB |
409 | mutex_destroy(&pd->pd_mtx); |
410 | cv_destroy(&pd->pd_cv); | |
b128c09f | 411 | |
47050a88 BB |
412 | kmem_free(czb, sizeof(zbookmark_t)); |
413 | kmem_free(pd, sizeof(struct prefetch_data)); | |
414 | kmem_free(td, sizeof(struct traverse_data)); | |
34dc7c2f | 415 | |
b128c09f | 416 | return (err); |
34dc7c2f BB |
417 | } |
418 | ||
b128c09f BB |
419 | /* |
420 | * NB: dataset must not be changing on-disk (eg, is a snapshot or we are | |
421 | * in syncing context). | |
422 | */ | |
423 | int | |
424 | traverse_dataset(dsl_dataset_t *ds, uint64_t txg_start, int flags, | |
425 | blkptr_cb_t func, void *arg) | |
34dc7c2f | 426 | { |
572e2857 | 427 | return (traverse_impl(ds->ds_dir->dd_pool->dp_spa, ds, |
b128c09f | 428 | &ds->ds_phys->ds_bp, txg_start, flags, func, arg)); |
34dc7c2f BB |
429 | } |
430 | ||
b128c09f BB |
431 | /* |
432 | * NB: pool must not be changing on-disk (eg, from zdb or sync context). | |
433 | */ | |
434 | int | |
428870ff BB |
435 | traverse_pool(spa_t *spa, uint64_t txg_start, int flags, |
436 | blkptr_cb_t func, void *arg) | |
34dc7c2f | 437 | { |
428870ff | 438 | int err, lasterr = 0; |
b128c09f BB |
439 | uint64_t obj; |
440 | dsl_pool_t *dp = spa_get_dsl(spa); | |
441 | objset_t *mos = dp->dp_meta_objset; | |
428870ff | 442 | boolean_t hard = (flags & TRAVERSE_HARD); |
b128c09f BB |
443 | |
444 | /* visit the MOS */ | |
572e2857 | 445 | err = traverse_impl(spa, NULL, spa_get_rootblkptr(spa), |
428870ff | 446 | txg_start, flags, func, arg); |
b128c09f BB |
447 | if (err) |
448 | return (err); | |
449 | ||
450 | /* visit each dataset */ | |
428870ff BB |
451 | for (obj = 1; err == 0 || (err != ESRCH && hard); |
452 | err = dmu_object_next(mos, &obj, FALSE, txg_start)) { | |
b128c09f BB |
453 | dmu_object_info_t doi; |
454 | ||
455 | err = dmu_object_info(mos, obj, &doi); | |
428870ff BB |
456 | if (err) { |
457 | if (!hard) | |
458 | return (err); | |
459 | lasterr = err; | |
460 | continue; | |
461 | } | |
b128c09f BB |
462 | |
463 | if (doi.doi_type == DMU_OT_DSL_DATASET) { | |
464 | dsl_dataset_t *ds; | |
428870ff BB |
465 | uint64_t txg = txg_start; |
466 | ||
b128c09f BB |
467 | rw_enter(&dp->dp_config_rwlock, RW_READER); |
468 | err = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); | |
469 | rw_exit(&dp->dp_config_rwlock); | |
428870ff BB |
470 | if (err) { |
471 | if (!hard) | |
472 | return (err); | |
473 | lasterr = err; | |
474 | continue; | |
475 | } | |
476 | if (ds->ds_phys->ds_prev_snap_txg > txg) | |
477 | txg = ds->ds_phys->ds_prev_snap_txg; | |
478 | err = traverse_dataset(ds, txg, flags, func, arg); | |
b128c09f | 479 | dsl_dataset_rele(ds, FTAG); |
428870ff BB |
480 | if (err) { |
481 | if (!hard) | |
482 | return (err); | |
483 | lasterr = err; | |
484 | } | |
b128c09f | 485 | } |
34dc7c2f | 486 | } |
b128c09f BB |
487 | if (err == ESRCH) |
488 | err = 0; | |
428870ff | 489 | return (err != 0 ? err : lasterr); |
34dc7c2f | 490 | } |
c28b2279 BB |
491 | |
492 | #if defined(_KERNEL) && defined(HAVE_SPL) | |
493 | EXPORT_SYMBOL(traverse_dataset); | |
494 | EXPORT_SYMBOL(traverse_pool); | |
c409e464 BB |
495 | |
496 | module_param(zfs_pd_blks_max, int, 0644); | |
497 | MODULE_PARM_DESC(zfs_pd_blks_max, "Max number of blocks to prefetch"); | |
c28b2279 | 498 | #endif |