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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. |
4e820b5a | 23 | * Copyright (c) 2012, 2016 by Delphix. All rights reserved. |
34dc7c2f BB |
24 | */ |
25 | ||
34dc7c2f BB |
26 | #include <sys/zfs_context.h> |
27 | #include <sys/dmu_objset.h> | |
28 | #include <sys/dmu_traverse.h> | |
29 | #include <sys/dsl_dataset.h> | |
30 | #include <sys/dsl_dir.h> | |
31 | #include <sys/dsl_pool.h> | |
32 | #include <sys/dnode.h> | |
33 | #include <sys/spa.h> | |
42f7b73b | 34 | #include <sys/spa_impl.h> |
34dc7c2f BB |
35 | #include <sys/zio.h> |
36 | #include <sys/dmu_impl.h> | |
428870ff BB |
37 | #include <sys/sa.h> |
38 | #include <sys/sa_impl.h> | |
b128c09f | 39 | #include <sys/callb.h> |
ea04106b | 40 | #include <sys/zfeature.h> |
b128c09f | 41 | |
ea04106b | 42 | int32_t zfs_pd_bytes_max = 50 * 1024 * 1024; /* 50MB */ |
cae5b340 | 43 | int32_t send_holes_without_birth_time = 1; |
572e2857 BB |
44 | |
45 | typedef struct prefetch_data { | |
b128c09f BB |
46 | kmutex_t pd_mtx; |
47 | kcondvar_t pd_cv; | |
ea04106b | 48 | int32_t pd_bytes_fetched; |
b128c09f BB |
49 | int pd_flags; |
50 | boolean_t pd_cancel; | |
51 | boolean_t pd_exited; | |
cae5b340 | 52 | zbookmark_phys_t pd_resume; |
572e2857 | 53 | } prefetch_data_t; |
b128c09f | 54 | |
572e2857 | 55 | typedef struct traverse_data { |
b128c09f BB |
56 | spa_t *td_spa; |
57 | uint64_t td_objset; | |
58 | blkptr_t *td_rootbp; | |
59 | uint64_t td_min_txg; | |
ea04106b | 60 | zbookmark_phys_t *td_resume; |
b128c09f | 61 | int td_flags; |
572e2857 | 62 | prefetch_data_t *td_pfd; |
ea04106b | 63 | boolean_t td_paused; |
e10b0808 | 64 | uint64_t td_hole_birth_enabled_txg; |
b128c09f BB |
65 | blkptr_cb_t *td_func; |
66 | void *td_arg; | |
4e820b5a | 67 | boolean_t td_realloc_possible; |
572e2857 | 68 | } traverse_data_t; |
34dc7c2f | 69 | |
572e2857 | 70 | static int traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp, |
c06d4368 AX |
71 | uint64_t objset, uint64_t object); |
72 | static void prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *, | |
73 | uint64_t objset, uint64_t object); | |
9babb374 | 74 | |
428870ff | 75 | static int |
34dc7c2f BB |
76 | traverse_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg) |
77 | { | |
572e2857 | 78 | traverse_data_t *td = arg; |
ea04106b | 79 | zbookmark_phys_t zb; |
34dc7c2f | 80 | |
ea04106b | 81 | if (BP_IS_HOLE(bp)) |
428870ff | 82 | return (0); |
34dc7c2f | 83 | |
b128c09f | 84 | if (claim_txg == 0 && bp->blk_birth >= spa_first_txg(td->td_spa)) |
428870ff BB |
85 | return (0); |
86 | ||
87 | SET_BOOKMARK(&zb, td->td_objset, ZB_ZIL_OBJECT, ZB_ZIL_LEVEL, | |
88 | bp->blk_cksum.zc_word[ZIL_ZC_SEQ]); | |
89 | ||
c06d4368 | 90 | (void) td->td_func(td->td_spa, zilog, bp, &zb, NULL, td->td_arg); |
b128c09f | 91 | |
428870ff | 92 | return (0); |
34dc7c2f BB |
93 | } |
94 | ||
428870ff | 95 | static int |
34dc7c2f BB |
96 | traverse_zil_record(zilog_t *zilog, lr_t *lrc, void *arg, uint64_t claim_txg) |
97 | { | |
572e2857 | 98 | traverse_data_t *td = arg; |
34dc7c2f BB |
99 | |
100 | if (lrc->lrc_txtype == TX_WRITE) { | |
101 | lr_write_t *lr = (lr_write_t *)lrc; | |
102 | blkptr_t *bp = &lr->lr_blkptr; | |
ea04106b | 103 | zbookmark_phys_t zb; |
34dc7c2f | 104 | |
ea04106b | 105 | if (BP_IS_HOLE(bp)) |
428870ff | 106 | return (0); |
34dc7c2f | 107 | |
b128c09f | 108 | if (claim_txg == 0 || bp->blk_birth < claim_txg) |
428870ff | 109 | return (0); |
b128c09f | 110 | |
572e2857 BB |
111 | SET_BOOKMARK(&zb, td->td_objset, lr->lr_foid, |
112 | ZB_ZIL_LEVEL, lr->lr_offset / BP_GET_LSIZE(bp)); | |
428870ff | 113 | |
c06d4368 | 114 | (void) td->td_func(td->td_spa, zilog, bp, &zb, NULL, |
428870ff | 115 | td->td_arg); |
34dc7c2f | 116 | } |
428870ff | 117 | return (0); |
34dc7c2f BB |
118 | } |
119 | ||
120 | static void | |
572e2857 | 121 | traverse_zil(traverse_data_t *td, zil_header_t *zh) |
34dc7c2f | 122 | { |
34dc7c2f BB |
123 | uint64_t claim_txg = zh->zh_claim_txg; |
124 | zilog_t *zilog; | |
125 | ||
34dc7c2f BB |
126 | /* |
127 | * We only want to visit blocks that have been claimed but not yet | |
428870ff | 128 | * replayed; plus, in read-only mode, blocks that are already stable. |
34dc7c2f | 129 | */ |
fb5f0bc8 | 130 | if (claim_txg == 0 && spa_writeable(td->td_spa)) |
34dc7c2f BB |
131 | return; |
132 | ||
b128c09f | 133 | zilog = zil_alloc(spa_get_dsl(td->td_spa)->dp_meta_objset, zh); |
34dc7c2f | 134 | |
b128c09f | 135 | (void) zil_parse(zilog, traverse_zil_block, traverse_zil_record, td, |
34dc7c2f BB |
136 | claim_txg); |
137 | ||
138 | zil_free(zilog); | |
139 | } | |
140 | ||
9ae529ec CS |
141 | typedef enum resume_skip { |
142 | RESUME_SKIP_ALL, | |
143 | RESUME_SKIP_NONE, | |
144 | RESUME_SKIP_CHILDREN | |
145 | } resume_skip_t; | |
146 | ||
147 | /* | |
148 | * Returns RESUME_SKIP_ALL if td indicates that we are resuming a traversal and | |
149 | * the block indicated by zb does not need to be visited at all. Returns | |
150 | * RESUME_SKIP_CHILDREN if we are resuming a post traversal and we reach the | |
151 | * resume point. This indicates that this block should be visited but not its | |
152 | * children (since they must have been visited in a previous traversal). | |
153 | * Otherwise returns RESUME_SKIP_NONE. | |
154 | */ | |
155 | static resume_skip_t | |
156 | resume_skip_check(traverse_data_t *td, const dnode_phys_t *dnp, | |
ea04106b | 157 | const zbookmark_phys_t *zb) |
9ae529ec CS |
158 | { |
159 | if (td->td_resume != NULL && !ZB_IS_ZERO(td->td_resume)) { | |
160 | /* | |
161 | * If we already visited this bp & everything below, | |
162 | * don't bother doing it again. | |
163 | */ | |
cae5b340 | 164 | if (zbookmark_subtree_completed(dnp, zb, td->td_resume)) |
9ae529ec CS |
165 | return (RESUME_SKIP_ALL); |
166 | ||
167 | /* | |
168 | * If we found the block we're trying to resume from, zero | |
169 | * the bookmark out to indicate that we have resumed. | |
170 | */ | |
9ae529ec CS |
171 | if (bcmp(zb, td->td_resume, sizeof (*zb)) == 0) { |
172 | bzero(td->td_resume, sizeof (*zb)); | |
173 | if (td->td_flags & TRAVERSE_POST) | |
174 | return (RESUME_SKIP_CHILDREN); | |
175 | } | |
176 | } | |
177 | return (RESUME_SKIP_NONE); | |
178 | } | |
179 | ||
c06d4368 AX |
180 | static void |
181 | traverse_prefetch_metadata(traverse_data_t *td, | |
ea04106b | 182 | const blkptr_t *bp, const zbookmark_phys_t *zb) |
c06d4368 | 183 | { |
e10b0808 | 184 | arc_flags_t flags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH; |
c06d4368 AX |
185 | |
186 | if (!(td->td_flags & TRAVERSE_PREFETCH_METADATA)) | |
187 | return; | |
188 | /* | |
189 | * If we are in the process of resuming, don't prefetch, because | |
190 | * some children will not be needed (and in fact may have already | |
191 | * been freed). | |
192 | */ | |
193 | if (td->td_resume != NULL && !ZB_IS_ZERO(td->td_resume)) | |
194 | return; | |
195 | if (BP_IS_HOLE(bp) || bp->blk_birth <= td->td_min_txg) | |
196 | return; | |
197 | if (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_DNODE) | |
198 | return; | |
199 | ||
200 | (void) arc_read(NULL, td->td_spa, bp, NULL, NULL, | |
201 | ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); | |
202 | } | |
203 | ||
ea04106b AX |
204 | static boolean_t |
205 | prefetch_needed(prefetch_data_t *pfd, const blkptr_t *bp) | |
206 | { | |
207 | ASSERT(pfd->pd_flags & TRAVERSE_PREFETCH_DATA); | |
208 | if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp) || | |
209 | BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG) | |
210 | return (B_FALSE); | |
211 | return (B_TRUE); | |
212 | } | |
213 | ||
c7f8f831 BB |
214 | static int |
215 | traverse_visitbp(traverse_data_t *td, const dnode_phys_t *dnp, | |
ea04106b | 216 | const blkptr_t *bp, const zbookmark_phys_t *zb) |
6656bf56 | 217 | { |
ea04106b | 218 | int err = 0; |
c7f8f831 | 219 | arc_buf_t *buf = NULL; |
ea04106b | 220 | prefetch_data_t *pd = td->td_pfd; |
9ae529ec CS |
221 | |
222 | switch (resume_skip_check(td, dnp, zb)) { | |
223 | case RESUME_SKIP_ALL: | |
224 | return (0); | |
225 | case RESUME_SKIP_CHILDREN: | |
226 | goto post; | |
227 | case RESUME_SKIP_NONE: | |
228 | break; | |
229 | default: | |
230 | ASSERT(0); | |
231 | } | |
6656bf56 | 232 | |
ea04106b | 233 | if (bp->blk_birth == 0) { |
e10b0808 | 234 | /* |
4e820b5a AX |
235 | * Since this block has a birth time of 0 it must be one of |
236 | * two things: a hole created before the | |
237 | * SPA_FEATURE_HOLE_BIRTH feature was enabled, or a hole | |
238 | * which has always been a hole in an object. | |
239 | * | |
240 | * If a file is written sparsely, then the unwritten parts of | |
241 | * the file were "always holes" -- that is, they have been | |
242 | * holes since this object was allocated. However, we (and | |
243 | * our callers) can not necessarily tell when an object was | |
244 | * allocated. Therefore, if it's possible that this object | |
245 | * was freed and then its object number reused, we need to | |
246 | * visit all the holes with birth==0. | |
247 | * | |
248 | * If it isn't possible that the object number was reused, | |
249 | * then if SPA_FEATURE_HOLE_BIRTH was enabled before we wrote | |
250 | * all the blocks we will visit as part of this traversal, | |
251 | * then this hole must have always existed, so we can skip | |
252 | * it. We visit blocks born after (exclusive) td_min_txg. | |
253 | * | |
254 | * Note that the meta-dnode cannot be reallocated. | |
e10b0808 | 255 | */ |
cae5b340 AX |
256 | if (!send_holes_without_birth_time && |
257 | (!td->td_realloc_possible || | |
258 | zb->zb_object == DMU_META_DNODE_OBJECT) && | |
259 | td->td_hole_birth_enabled_txg <= td->td_min_txg) | |
e10b0808 | 260 | return (0); |
ea04106b AX |
261 | } else if (bp->blk_birth <= td->td_min_txg) { |
262 | return (0); | |
34dc7c2f BB |
263 | } |
264 | ||
ea04106b AX |
265 | if (pd != NULL && !pd->pd_exited && prefetch_needed(pd, bp)) { |
266 | uint64_t size = BP_GET_LSIZE(bp); | |
267 | mutex_enter(&pd->pd_mtx); | |
268 | ASSERT(pd->pd_bytes_fetched >= 0); | |
269 | while (pd->pd_bytes_fetched < size && !pd->pd_exited) | |
e10b0808 | 270 | cv_wait_sig(&pd->pd_cv, &pd->pd_mtx); |
ea04106b AX |
271 | pd->pd_bytes_fetched -= size; |
272 | cv_broadcast(&pd->pd_cv); | |
273 | mutex_exit(&pd->pd_mtx); | |
274 | } | |
34dc7c2f | 275 | |
ea04106b AX |
276 | if (BP_IS_HOLE(bp)) { |
277 | err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg); | |
278 | if (err != 0) | |
279 | goto post; | |
280 | return (0); | |
34dc7c2f BB |
281 | } |
282 | ||
c7f8f831 | 283 | if (td->td_flags & TRAVERSE_PRE) { |
c06d4368 | 284 | err = td->td_func(td->td_spa, NULL, bp, zb, dnp, |
c7f8f831 BB |
285 | td->td_arg); |
286 | if (err == TRAVERSE_VISIT_NO_CHILDREN) | |
572e2857 | 287 | return (0); |
9ae529ec CS |
288 | if (err != 0) |
289 | goto post; | |
34dc7c2f BB |
290 | } |
291 | ||
c7f8f831 | 292 | if (BP_GET_LEVEL(bp) > 0) { |
e10b0808 | 293 | uint32_t flags = ARC_FLAG_WAIT; |
a08ee875 LG |
294 | int32_t i; |
295 | int32_t epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT; | |
ea04106b | 296 | zbookmark_phys_t *czb; |
b128c09f | 297 | |
c06d4368 | 298 | err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf, |
c7f8f831 | 299 | ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); |
a08ee875 | 300 | if (err != 0) |
ea04106b | 301 | goto post; |
a08ee875 | 302 | |
ea04106b | 303 | czb = kmem_alloc(sizeof (zbookmark_phys_t), KM_SLEEP); |
c06d4368 AX |
304 | |
305 | for (i = 0; i < epb; i++) { | |
a08ee875 | 306 | SET_BOOKMARK(czb, zb->zb_objset, zb->zb_object, |
c06d4368 AX |
307 | zb->zb_level - 1, |
308 | zb->zb_blkid * epb + i); | |
a08ee875 LG |
309 | traverse_prefetch_metadata(td, |
310 | &((blkptr_t *)buf->b_data)[i], czb); | |
c06d4368 | 311 | } |
b128c09f BB |
312 | |
313 | /* recursively visitbp() blocks below this */ | |
c06d4368 | 314 | for (i = 0; i < epb; i++) { |
a08ee875 | 315 | SET_BOOKMARK(czb, zb->zb_objset, zb->zb_object, |
c7f8f831 BB |
316 | zb->zb_level - 1, |
317 | zb->zb_blkid * epb + i); | |
a08ee875 LG |
318 | err = traverse_visitbp(td, dnp, |
319 | &((blkptr_t *)buf->b_data)[i], czb); | |
ea04106b AX |
320 | if (err != 0) |
321 | break; | |
b128c09f | 322 | } |
a08ee875 | 323 | |
ea04106b | 324 | kmem_free(czb, sizeof (zbookmark_phys_t)); |
a08ee875 | 325 | |
c7f8f831 | 326 | } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) { |
e10b0808 | 327 | uint32_t flags = ARC_FLAG_WAIT; |
a08ee875 LG |
328 | int32_t i; |
329 | int32_t epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT; | |
cae5b340 | 330 | dnode_phys_t *child_dnp; |
b128c09f | 331 | |
c06d4368 | 332 | err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf, |
c7f8f831 | 333 | ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); |
a08ee875 | 334 | if (err != 0) |
ea04106b | 335 | goto post; |
cae5b340 | 336 | child_dnp = buf->b_data; |
c06d4368 | 337 | |
cae5b340 AX |
338 | for (i = 0; i < epb; i += child_dnp[i].dn_extra_slots + 1) { |
339 | prefetch_dnode_metadata(td, &child_dnp[i], | |
340 | zb->zb_objset, zb->zb_blkid * epb + i); | |
c06d4368 | 341 | } |
b128c09f BB |
342 | |
343 | /* recursively visitbp() blocks below this */ | |
cae5b340 AX |
344 | for (i = 0; i < epb; i += child_dnp[i].dn_extra_slots + 1) { |
345 | err = traverse_dnode(td, &child_dnp[i], | |
346 | zb->zb_objset, zb->zb_blkid * epb + i); | |
ea04106b AX |
347 | if (err != 0) |
348 | break; | |
34dc7c2f | 349 | } |
c7f8f831 | 350 | } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) { |
e10b0808 | 351 | arc_flags_t flags = ARC_FLAG_WAIT; |
c7f8f831 | 352 | objset_phys_t *osp; |
c7f8f831 | 353 | |
c06d4368 | 354 | err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf, |
c7f8f831 | 355 | ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); |
a08ee875 | 356 | if (err != 0) |
ea04106b | 357 | goto post; |
c7f8f831 BB |
358 | |
359 | osp = buf->b_data; | |
cae5b340 | 360 | prefetch_dnode_metadata(td, &osp->os_meta_dnode, zb->zb_objset, |
c06d4368 | 361 | DMU_META_DNODE_OBJECT); |
4e820b5a AX |
362 | /* |
363 | * See the block comment above for the goal of this variable. | |
364 | * If the maxblkid of the meta-dnode is 0, then we know that | |
365 | * we've never had more than DNODES_PER_BLOCK objects in the | |
366 | * dataset, which means we can't have reused any object ids. | |
367 | */ | |
368 | if (osp->os_meta_dnode.dn_maxblkid == 0) | |
369 | td->td_realloc_possible = B_FALSE; | |
370 | ||
c06d4368 | 371 | if (arc_buf_size(buf) >= sizeof (objset_phys_t)) { |
cae5b340 AX |
372 | prefetch_dnode_metadata(td, &osp->os_groupused_dnode, |
373 | zb->zb_objset, DMU_GROUPUSED_OBJECT); | |
374 | prefetch_dnode_metadata(td, &osp->os_userused_dnode, | |
375 | zb->zb_objset, DMU_USERUSED_OBJECT); | |
c06d4368 AX |
376 | } |
377 | ||
cae5b340 | 378 | err = traverse_dnode(td, &osp->os_meta_dnode, zb->zb_objset, |
c7f8f831 | 379 | DMU_META_DNODE_OBJECT); |
c7f8f831 | 380 | if (err == 0 && arc_buf_size(buf) >= sizeof (objset_phys_t)) { |
cae5b340 AX |
381 | err = traverse_dnode(td, &osp->os_groupused_dnode, |
382 | zb->zb_objset, DMU_GROUPUSED_OBJECT); | |
9babb374 | 383 | } |
c7f8f831 | 384 | if (err == 0 && arc_buf_size(buf) >= sizeof (objset_phys_t)) { |
cae5b340 AX |
385 | err = traverse_dnode(td, &osp->os_userused_dnode, |
386 | zb->zb_objset, DMU_USERUSED_OBJECT); | |
34dc7c2f | 387 | } |
34dc7c2f BB |
388 | } |
389 | ||
c7f8f831 | 390 | if (buf) |
cae5b340 | 391 | arc_buf_destroy(buf, &buf); |
34dc7c2f | 392 | |
9ae529ec | 393 | post: |
ea04106b | 394 | if (err == 0 && (td->td_flags & TRAVERSE_POST)) |
c06d4368 | 395 | err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg); |
ea04106b AX |
396 | |
397 | if ((td->td_flags & TRAVERSE_HARD) && (err == EIO || err == ECKSUM)) { | |
398 | /* | |
399 | * Ignore this disk error as requested by the HARD flag, | |
400 | * and continue traversal. | |
401 | */ | |
402 | err = 0; | |
9ae529ec CS |
403 | } |
404 | ||
ea04106b AX |
405 | /* |
406 | * If we are stopping here, set td_resume. | |
407 | */ | |
408 | if (td->td_resume != NULL && err != 0 && !td->td_paused) { | |
409 | td->td_resume->zb_objset = zb->zb_objset; | |
410 | td->td_resume->zb_object = zb->zb_object; | |
411 | td->td_resume->zb_level = 0; | |
412 | /* | |
413 | * If we have stopped on an indirect block (e.g. due to | |
414 | * i/o error), we have not visited anything below it. | |
415 | * Set the bookmark to the first level-0 block that we need | |
416 | * to visit. This way, the resuming code does not need to | |
417 | * deal with resuming from indirect blocks. | |
cae5b340 AX |
418 | * |
419 | * Note, if zb_level <= 0, dnp may be NULL, so we don't want | |
420 | * to dereference it. | |
ea04106b | 421 | */ |
cae5b340 AX |
422 | td->td_resume->zb_blkid = zb->zb_blkid; |
423 | if (zb->zb_level > 0) { | |
424 | td->td_resume->zb_blkid <<= zb->zb_level * | |
425 | (dnp->dn_indblkshift - SPA_BLKPTRSHIFT); | |
426 | } | |
ea04106b | 427 | td->td_paused = B_TRUE; |
428870ff | 428 | } |
34dc7c2f | 429 | |
ea04106b | 430 | return (err); |
34dc7c2f BB |
431 | } |
432 | ||
c06d4368 AX |
433 | static void |
434 | prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *dnp, | |
435 | uint64_t objset, uint64_t object) | |
436 | { | |
437 | int j; | |
ea04106b | 438 | zbookmark_phys_t czb; |
c06d4368 AX |
439 | |
440 | for (j = 0; j < dnp->dn_nblkptr; j++) { | |
441 | SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j); | |
442 | traverse_prefetch_metadata(td, &dnp->dn_blkptr[j], &czb); | |
443 | } | |
444 | ||
445 | if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) { | |
446 | SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID); | |
cae5b340 | 447 | traverse_prefetch_metadata(td, DN_SPILL_BLKPTR(dnp), &czb); |
c06d4368 AX |
448 | } |
449 | } | |
450 | ||
9babb374 | 451 | static int |
572e2857 | 452 | traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp, |
c06d4368 | 453 | uint64_t objset, uint64_t object) |
9babb374 | 454 | { |
ea04106b AX |
455 | int j, err = 0; |
456 | zbookmark_phys_t czb; | |
9babb374 | 457 | |
cae5b340 AX |
458 | if (object != DMU_META_DNODE_OBJECT && td->td_resume != NULL && |
459 | object < td->td_resume->zb_object) | |
460 | return (0); | |
461 | ||
462 | if (td->td_flags & TRAVERSE_PRE) { | |
463 | SET_BOOKMARK(&czb, objset, object, ZB_DNODE_LEVEL, | |
464 | ZB_DNODE_BLKID); | |
465 | err = td->td_func(td->td_spa, NULL, NULL, &czb, dnp, | |
466 | td->td_arg); | |
467 | if (err == TRAVERSE_VISIT_NO_CHILDREN) | |
468 | return (0); | |
469 | if (err != 0) | |
470 | return (err); | |
471 | } | |
472 | ||
9babb374 BB |
473 | for (j = 0; j < dnp->dn_nblkptr; j++) { |
474 | SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j); | |
c06d4368 | 475 | err = traverse_visitbp(td, dnp, &dnp->dn_blkptr[j], &czb); |
ea04106b AX |
476 | if (err != 0) |
477 | break; | |
9babb374 | 478 | } |
428870ff | 479 | |
cae5b340 | 480 | if (err == 0 && (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) { |
c06d4368 | 481 | SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID); |
cae5b340 AX |
482 | err = traverse_visitbp(td, dnp, DN_SPILL_BLKPTR(dnp), &czb); |
483 | } | |
484 | ||
485 | if (err == 0 && (td->td_flags & TRAVERSE_POST)) { | |
486 | SET_BOOKMARK(&czb, objset, object, ZB_DNODE_LEVEL, | |
487 | ZB_DNODE_BLKID); | |
488 | err = td->td_func(td->td_spa, NULL, NULL, &czb, dnp, | |
489 | td->td_arg); | |
490 | if (err == TRAVERSE_VISIT_NO_CHILDREN) | |
491 | return (0); | |
492 | if (err != 0) | |
493 | return (err); | |
428870ff | 494 | } |
ea04106b | 495 | return (err); |
9babb374 BB |
496 | } |
497 | ||
b128c09f BB |
498 | /* ARGSUSED */ |
499 | static int | |
428870ff | 500 | traverse_prefetcher(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, |
ea04106b | 501 | const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg) |
34dc7c2f | 502 | { |
572e2857 | 503 | prefetch_data_t *pfd = arg; |
e10b0808 | 504 | arc_flags_t aflags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH; |
34dc7c2f | 505 | |
ea04106b | 506 | ASSERT(pfd->pd_bytes_fetched >= 0); |
cae5b340 AX |
507 | if (bp == NULL) |
508 | return (0); | |
b128c09f | 509 | if (pfd->pd_cancel) |
a08ee875 | 510 | return (SET_ERROR(EINTR)); |
34dc7c2f | 511 | |
ea04106b | 512 | if (!prefetch_needed(pfd, bp)) |
34dc7c2f BB |
513 | return (0); |
514 | ||
b128c09f | 515 | mutex_enter(&pfd->pd_mtx); |
ea04106b | 516 | while (!pfd->pd_cancel && pfd->pd_bytes_fetched >= zfs_pd_bytes_max) |
e10b0808 | 517 | cv_wait_sig(&pfd->pd_cv, &pfd->pd_mtx); |
ea04106b | 518 | pfd->pd_bytes_fetched += BP_GET_LSIZE(bp); |
b128c09f BB |
519 | cv_broadcast(&pfd->pd_cv); |
520 | mutex_exit(&pfd->pd_mtx); | |
34dc7c2f | 521 | |
c06d4368 AX |
522 | (void) arc_read(NULL, spa, bp, NULL, NULL, ZIO_PRIORITY_ASYNC_READ, |
523 | ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, &aflags, zb); | |
34dc7c2f | 524 | |
b128c09f | 525 | return (0); |
34dc7c2f BB |
526 | } |
527 | ||
34dc7c2f | 528 | static void |
b128c09f | 529 | traverse_prefetch_thread(void *arg) |
34dc7c2f | 530 | { |
572e2857 BB |
531 | traverse_data_t *td_main = arg; |
532 | traverse_data_t td = *td_main; | |
ea04106b | 533 | zbookmark_phys_t czb; |
e10b0808 | 534 | fstrans_cookie_t cookie = spl_fstrans_mark(); |
34dc7c2f | 535 | |
b128c09f BB |
536 | td.td_func = traverse_prefetcher; |
537 | td.td_arg = td_main->td_pfd; | |
538 | td.td_pfd = NULL; | |
cae5b340 | 539 | td.td_resume = &td_main->td_pfd->pd_resume; |
34dc7c2f | 540 | |
428870ff BB |
541 | SET_BOOKMARK(&czb, td.td_objset, |
542 | ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); | |
c06d4368 | 543 | (void) traverse_visitbp(&td, NULL, td.td_rootbp, &czb); |
34dc7c2f | 544 | |
b128c09f BB |
545 | mutex_enter(&td_main->td_pfd->pd_mtx); |
546 | td_main->td_pfd->pd_exited = B_TRUE; | |
547 | cv_broadcast(&td_main->td_pfd->pd_cv); | |
548 | mutex_exit(&td_main->td_pfd->pd_mtx); | |
e10b0808 | 549 | spl_fstrans_unmark(cookie); |
34dc7c2f BB |
550 | } |
551 | ||
b128c09f BB |
552 | /* |
553 | * NB: dataset must not be changing on-disk (eg, is a snapshot or we are | |
554 | * in syncing context). | |
555 | */ | |
556 | static int | |
9ae529ec | 557 | traverse_impl(spa_t *spa, dsl_dataset_t *ds, uint64_t objset, blkptr_t *rootbp, |
ea04106b | 558 | uint64_t txg_start, zbookmark_phys_t *resume, int flags, |
9ae529ec | 559 | blkptr_cb_t func, void *arg) |
34dc7c2f | 560 | { |
47050a88 BB |
561 | traverse_data_t *td; |
562 | prefetch_data_t *pd; | |
ea04106b | 563 | zbookmark_phys_t *czb; |
b128c09f | 564 | int err; |
34dc7c2f | 565 | |
9ae529ec CS |
566 | ASSERT(ds == NULL || objset == ds->ds_object); |
567 | ASSERT(!(flags & TRAVERSE_PRE) || !(flags & TRAVERSE_POST)); | |
568 | ||
ea04106b AX |
569 | td = kmem_alloc(sizeof (traverse_data_t), KM_SLEEP); |
570 | pd = kmem_zalloc(sizeof (prefetch_data_t), KM_SLEEP); | |
571 | czb = kmem_alloc(sizeof (zbookmark_phys_t), KM_SLEEP); | |
47050a88 BB |
572 | |
573 | td->td_spa = spa; | |
9ae529ec | 574 | td->td_objset = objset; |
47050a88 BB |
575 | td->td_rootbp = rootbp; |
576 | td->td_min_txg = txg_start; | |
9ae529ec | 577 | td->td_resume = resume; |
47050a88 BB |
578 | td->td_func = func; |
579 | td->td_arg = arg; | |
580 | td->td_pfd = pd; | |
581 | td->td_flags = flags; | |
ea04106b | 582 | td->td_paused = B_FALSE; |
4e820b5a | 583 | td->td_realloc_possible = (txg_start == 0 ? B_FALSE : B_TRUE); |
b128c09f | 584 | |
e10b0808 AX |
585 | if (spa_feature_is_active(spa, SPA_FEATURE_HOLE_BIRTH)) { |
586 | VERIFY(spa_feature_enabled_txg(spa, | |
587 | SPA_FEATURE_HOLE_BIRTH, &td->td_hole_birth_enabled_txg)); | |
588 | } else { | |
4e820b5a | 589 | td->td_hole_birth_enabled_txg = UINT64_MAX; |
e10b0808 AX |
590 | } |
591 | ||
47050a88 | 592 | pd->pd_flags = flags; |
cae5b340 AX |
593 | if (resume != NULL) |
594 | pd->pd_resume = *resume; | |
47050a88 BB |
595 | mutex_init(&pd->pd_mtx, NULL, MUTEX_DEFAULT, NULL); |
596 | cv_init(&pd->pd_cv, NULL, CV_DEFAULT, NULL); | |
b128c09f | 597 | |
a08ee875 LG |
598 | SET_BOOKMARK(czb, td->td_objset, |
599 | ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); | |
600 | ||
572e2857 | 601 | /* See comment on ZIL traversal in dsl_scan_visitds. */ |
e10b0808 | 602 | if (ds != NULL && !ds->ds_is_snapshot && !BP_IS_HOLE(rootbp)) { |
42f7b73b | 603 | enum zio_flag zio_flags = ZIO_FLAG_CANFAIL; |
e10b0808 | 604 | uint32_t flags = ARC_FLAG_WAIT; |
a08ee875 LG |
605 | objset_phys_t *osp; |
606 | arc_buf_t *buf; | |
572e2857 | 607 | |
42f7b73b AX |
608 | err = arc_read(NULL, td->td_spa, rootbp, arc_getbuf_func, |
609 | &buf, ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, czb); | |
610 | if (err != 0) { | |
611 | /* | |
612 | * If both TRAVERSE_HARD and TRAVERSE_PRE are set, | |
613 | * continue to visitbp so that td_func can be called | |
614 | * in pre stage, and err will reset to zero. | |
615 | */ | |
616 | if (!(td->td_flags & TRAVERSE_HARD) || | |
617 | !(td->td_flags & TRAVERSE_PRE)) | |
618 | return (err); | |
619 | } else { | |
620 | osp = buf->b_data; | |
621 | traverse_zil(td, &osp->os_zil_header); | |
622 | arc_buf_destroy(buf, &buf); | |
623 | } | |
572e2857 BB |
624 | } |
625 | ||
c06d4368 | 626 | if (!(flags & TRAVERSE_PREFETCH_DATA) || |
42f7b73b | 627 | taskq_dispatch(spa->spa_prefetch_taskq, traverse_prefetch_thread, |
cae5b340 | 628 | td, TQ_NOQUEUE) == TASKQID_INVALID) |
47050a88 | 629 | pd->pd_exited = B_TRUE; |
b128c09f | 630 | |
c06d4368 | 631 | err = traverse_visitbp(td, NULL, rootbp, czb); |
47050a88 BB |
632 | |
633 | mutex_enter(&pd->pd_mtx); | |
634 | pd->pd_cancel = B_TRUE; | |
635 | cv_broadcast(&pd->pd_cv); | |
636 | while (!pd->pd_exited) | |
e10b0808 | 637 | cv_wait_sig(&pd->pd_cv, &pd->pd_mtx); |
47050a88 | 638 | mutex_exit(&pd->pd_mtx); |
b128c09f | 639 | |
47050a88 BB |
640 | mutex_destroy(&pd->pd_mtx); |
641 | cv_destroy(&pd->pd_cv); | |
b128c09f | 642 | |
ea04106b | 643 | kmem_free(czb, sizeof (zbookmark_phys_t)); |
a08ee875 LG |
644 | kmem_free(pd, sizeof (struct prefetch_data)); |
645 | kmem_free(td, sizeof (struct traverse_data)); | |
34dc7c2f | 646 | |
b128c09f | 647 | return (err); |
34dc7c2f BB |
648 | } |
649 | ||
b128c09f BB |
650 | /* |
651 | * NB: dataset must not be changing on-disk (eg, is a snapshot or we are | |
652 | * in syncing context). | |
653 | */ | |
654 | int | |
cae5b340 AX |
655 | traverse_dataset_resume(dsl_dataset_t *ds, uint64_t txg_start, |
656 | zbookmark_phys_t *resume, | |
657 | int flags, blkptr_cb_t func, void *arg) | |
34dc7c2f | 658 | { |
9ae529ec | 659 | return (traverse_impl(ds->ds_dir->dd_pool->dp_spa, ds, ds->ds_object, |
cae5b340 AX |
660 | &dsl_dataset_phys(ds)->ds_bp, txg_start, resume, flags, func, arg)); |
661 | } | |
662 | ||
663 | int | |
664 | traverse_dataset(dsl_dataset_t *ds, uint64_t txg_start, | |
665 | int flags, blkptr_cb_t func, void *arg) | |
666 | { | |
667 | return (traverse_dataset_resume(ds, txg_start, NULL, flags, func, arg)); | |
9ae529ec CS |
668 | } |
669 | ||
670 | int | |
671 | traverse_dataset_destroyed(spa_t *spa, blkptr_t *blkptr, | |
ea04106b | 672 | uint64_t txg_start, zbookmark_phys_t *resume, int flags, |
9ae529ec CS |
673 | blkptr_cb_t func, void *arg) |
674 | { | |
675 | return (traverse_impl(spa, NULL, ZB_DESTROYED_OBJSET, | |
676 | blkptr, txg_start, resume, flags, func, arg)); | |
34dc7c2f BB |
677 | } |
678 | ||
b128c09f BB |
679 | /* |
680 | * NB: pool must not be changing on-disk (eg, from zdb or sync context). | |
681 | */ | |
682 | int | |
428870ff BB |
683 | traverse_pool(spa_t *spa, uint64_t txg_start, int flags, |
684 | blkptr_cb_t func, void *arg) | |
34dc7c2f | 685 | { |
ea04106b | 686 | int err; |
b128c09f BB |
687 | uint64_t obj; |
688 | dsl_pool_t *dp = spa_get_dsl(spa); | |
689 | objset_t *mos = dp->dp_meta_objset; | |
428870ff | 690 | boolean_t hard = (flags & TRAVERSE_HARD); |
b128c09f BB |
691 | |
692 | /* visit the MOS */ | |
9ae529ec CS |
693 | err = traverse_impl(spa, NULL, 0, spa_get_rootblkptr(spa), |
694 | txg_start, NULL, flags, func, arg); | |
a08ee875 | 695 | if (err != 0) |
b128c09f BB |
696 | return (err); |
697 | ||
698 | /* visit each dataset */ | |
ea04106b | 699 | for (obj = 1; err == 0; |
cae5b340 | 700 | err = dmu_object_next(mos, &obj, B_FALSE, txg_start)) { |
b128c09f BB |
701 | dmu_object_info_t doi; |
702 | ||
703 | err = dmu_object_info(mos, obj, &doi); | |
a08ee875 | 704 | if (err != 0) { |
ea04106b AX |
705 | if (hard) |
706 | continue; | |
707 | break; | |
428870ff | 708 | } |
b128c09f | 709 | |
ea04106b | 710 | if (doi.doi_bonus_type == DMU_OT_DSL_DATASET) { |
b128c09f | 711 | dsl_dataset_t *ds; |
428870ff BB |
712 | uint64_t txg = txg_start; |
713 | ||
a08ee875 | 714 | dsl_pool_config_enter(dp, FTAG); |
b128c09f | 715 | err = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); |
a08ee875 LG |
716 | dsl_pool_config_exit(dp, FTAG); |
717 | if (err != 0) { | |
ea04106b AX |
718 | if (hard) |
719 | continue; | |
720 | break; | |
428870ff | 721 | } |
e10b0808 AX |
722 | if (dsl_dataset_phys(ds)->ds_prev_snap_txg > txg) |
723 | txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; | |
428870ff | 724 | err = traverse_dataset(ds, txg, flags, func, arg); |
b128c09f | 725 | dsl_dataset_rele(ds, FTAG); |
ea04106b AX |
726 | if (err != 0) |
727 | break; | |
b128c09f | 728 | } |
34dc7c2f | 729 | } |
b128c09f BB |
730 | if (err == ESRCH) |
731 | err = 0; | |
ea04106b | 732 | return (err); |
34dc7c2f | 733 | } |
c28b2279 BB |
734 | |
735 | #if defined(_KERNEL) && defined(HAVE_SPL) | |
736 | EXPORT_SYMBOL(traverse_dataset); | |
737 | EXPORT_SYMBOL(traverse_pool); | |
c409e464 | 738 | |
ea04106b AX |
739 | module_param(zfs_pd_bytes_max, int, 0644); |
740 | MODULE_PARM_DESC(zfs_pd_bytes_max, "Max number of bytes to prefetch"); | |
87dac73d | 741 | |
cae5b340 AX |
742 | module_param_named(ignore_hole_birth, send_holes_without_birth_time, int, 0644); |
743 | MODULE_PARM_DESC(ignore_hole_birth, "Alias for send_holes_without_birth_time"); | |
744 | ||
745 | module_param_named(send_holes_without_birth_time, | |
746 | send_holes_without_birth_time, int, 0644); | |
747 | MODULE_PARM_DESC(send_holes_without_birth_time, | |
748 | "Ignore hole_birth txg for zfs send"); | |
c28b2279 | 749 | #endif |