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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. |
d2734cce | 23 | * Copyright (c) 2012, 2018 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> | |
77d8a0f1 | 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> |
b0bc7a84 | 40 | #include <sys/zfeature.h> |
b128c09f | 41 | |
18168da7 AZ |
42 | static int32_t zfs_pd_bytes_max = 50 * 1024 * 1024; /* 50MB */ |
43 | static int32_t send_holes_without_birth_time = 1; | |
fdc2d303 | 44 | static uint_t zfs_traverse_indirect_prefetch_limit = 32; |
572e2857 BB |
45 | |
46 | typedef struct prefetch_data { | |
b128c09f BB |
47 | kmutex_t pd_mtx; |
48 | kcondvar_t pd_cv; | |
b738bc5a | 49 | int32_t pd_bytes_fetched; |
b128c09f BB |
50 | int pd_flags; |
51 | boolean_t pd_cancel; | |
52 | boolean_t pd_exited; | |
47dfff3b | 53 | zbookmark_phys_t pd_resume; |
572e2857 | 54 | } prefetch_data_t; |
b128c09f | 55 | |
572e2857 | 56 | typedef struct traverse_data { |
b128c09f BB |
57 | spa_t *td_spa; |
58 | uint64_t td_objset; | |
59 | blkptr_t *td_rootbp; | |
60 | uint64_t td_min_txg; | |
5dbd68a3 | 61 | zbookmark_phys_t *td_resume; |
b128c09f | 62 | int td_flags; |
572e2857 | 63 | prefetch_data_t *td_pfd; |
fbeddd60 | 64 | boolean_t td_paused; |
e5fd1dd6 | 65 | uint64_t td_hole_birth_enabled_txg; |
b128c09f BB |
66 | blkptr_cb_t *td_func; |
67 | void *td_arg; | |
c352ec27 | 68 | boolean_t td_realloc_possible; |
572e2857 | 69 | } traverse_data_t; |
34dc7c2f | 70 | |
30af21b0 PD |
71 | static int traverse_dnode(traverse_data_t *td, const blkptr_t *bp, |
72 | const dnode_phys_t *dnp, uint64_t objset, uint64_t object); | |
96b89346 | 73 | static void prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *, |
294f6806 | 74 | uint64_t objset, uint64_t object); |
9babb374 | 75 | |
428870ff | 76 | static int |
61868bb1 CS |
77 | traverse_zil_block(zilog_t *zilog, const blkptr_t *bp, void *arg, |
78 | uint64_t claim_txg) | |
34dc7c2f | 79 | { |
572e2857 | 80 | traverse_data_t *td = arg; |
5dbd68a3 | 81 | zbookmark_phys_t zb; |
34dc7c2f | 82 | |
b0bc7a84 | 83 | if (BP_IS_HOLE(bp)) |
428870ff | 84 | return (0); |
34dc7c2f | 85 | |
d2734cce SD |
86 | if (claim_txg == 0 && bp->blk_birth >= spa_min_claim_txg(td->td_spa)) |
87 | return (-1); | |
428870ff BB |
88 | |
89 | SET_BOOKMARK(&zb, td->td_objset, ZB_ZIL_OBJECT, ZB_ZIL_LEVEL, | |
90 | bp->blk_cksum.zc_word[ZIL_ZC_SEQ]); | |
91 | ||
294f6806 | 92 | (void) td->td_func(td->td_spa, zilog, bp, &zb, NULL, td->td_arg); |
b128c09f | 93 | |
428870ff | 94 | return (0); |
34dc7c2f BB |
95 | } |
96 | ||
428870ff | 97 | static int |
61868bb1 CS |
98 | traverse_zil_record(zilog_t *zilog, const lr_t *lrc, void *arg, |
99 | uint64_t claim_txg) | |
34dc7c2f | 100 | { |
572e2857 | 101 | traverse_data_t *td = arg; |
34dc7c2f BB |
102 | |
103 | if (lrc->lrc_txtype == TX_WRITE) { | |
104 | lr_write_t *lr = (lr_write_t *)lrc; | |
105 | blkptr_t *bp = &lr->lr_blkptr; | |
5dbd68a3 | 106 | zbookmark_phys_t zb; |
34dc7c2f | 107 | |
b0bc7a84 | 108 | if (BP_IS_HOLE(bp)) |
428870ff | 109 | return (0); |
34dc7c2f | 110 | |
b128c09f | 111 | if (claim_txg == 0 || bp->blk_birth < claim_txg) |
428870ff | 112 | return (0); |
b128c09f | 113 | |
a6ccb36b | 114 | ASSERT3U(BP_GET_LSIZE(bp), !=, 0); |
572e2857 BB |
115 | SET_BOOKMARK(&zb, td->td_objset, lr->lr_foid, |
116 | ZB_ZIL_LEVEL, lr->lr_offset / BP_GET_LSIZE(bp)); | |
428870ff | 117 | |
294f6806 | 118 | (void) td->td_func(td->td_spa, zilog, bp, &zb, NULL, |
428870ff | 119 | td->td_arg); |
34dc7c2f | 120 | } |
428870ff | 121 | return (0); |
34dc7c2f BB |
122 | } |
123 | ||
124 | static void | |
572e2857 | 125 | traverse_zil(traverse_data_t *td, zil_header_t *zh) |
34dc7c2f | 126 | { |
34dc7c2f | 127 | uint64_t claim_txg = zh->zh_claim_txg; |
34dc7c2f | 128 | |
34dc7c2f BB |
129 | /* |
130 | * We only want to visit blocks that have been claimed but not yet | |
d2734cce | 131 | * replayed; plus blocks that are already stable in read-only mode. |
34dc7c2f | 132 | */ |
fb5f0bc8 | 133 | if (claim_txg == 0 && spa_writeable(td->td_spa)) |
34dc7c2f BB |
134 | return; |
135 | ||
d2734cce | 136 | zilog_t *zilog = zil_alloc(spa_get_dsl(td->td_spa)->dp_meta_objset, zh); |
b128c09f | 137 | (void) zil_parse(zilog, traverse_zil_block, traverse_zil_record, td, |
b5256303 | 138 | claim_txg, !(td->td_flags & TRAVERSE_NO_DECRYPT)); |
34dc7c2f BB |
139 | zil_free(zilog); |
140 | } | |
141 | ||
9ae529ec CS |
142 | typedef enum resume_skip { |
143 | RESUME_SKIP_ALL, | |
144 | RESUME_SKIP_NONE, | |
145 | RESUME_SKIP_CHILDREN | |
146 | } resume_skip_t; | |
147 | ||
148 | /* | |
149 | * Returns RESUME_SKIP_ALL if td indicates that we are resuming a traversal and | |
150 | * the block indicated by zb does not need to be visited at all. Returns | |
151 | * RESUME_SKIP_CHILDREN if we are resuming a post traversal and we reach the | |
152 | * resume point. This indicates that this block should be visited but not its | |
153 | * children (since they must have been visited in a previous traversal). | |
154 | * Otherwise returns RESUME_SKIP_NONE. | |
155 | */ | |
156 | static resume_skip_t | |
d2d4f855 | 157 | resume_skip_check(const traverse_data_t *td, const dnode_phys_t *dnp, |
5dbd68a3 | 158 | const zbookmark_phys_t *zb) |
9ae529ec | 159 | { |
d2d4f855 | 160 | if (td->td_resume != NULL) { |
9ae529ec CS |
161 | /* |
162 | * If we already visited this bp & everything below, | |
163 | * don't bother doing it again. | |
164 | */ | |
fcff0f35 | 165 | if (zbookmark_subtree_completed(dnp, zb, td->td_resume)) |
9ae529ec CS |
166 | return (RESUME_SKIP_ALL); |
167 | ||
861166b0 | 168 | if (memcmp(zb, td->td_resume, sizeof (*zb)) == 0) { |
9ae529ec CS |
169 | if (td->td_flags & TRAVERSE_POST) |
170 | return (RESUME_SKIP_CHILDREN); | |
171 | } | |
172 | } | |
173 | return (RESUME_SKIP_NONE); | |
174 | } | |
175 | ||
08795ab8 JP |
176 | /* |
177 | * Returns B_TRUE, if prefetch read is issued, otherwise B_FALSE. | |
178 | */ | |
179 | static boolean_t | |
d2d4f855 | 180 | traverse_prefetch_metadata(traverse_data_t *td, const dnode_phys_t *dnp, |
5dbd68a3 | 181 | const blkptr_t *bp, const zbookmark_phys_t *zb) |
96b89346 | 182 | { |
c935fe2e AM |
183 | arc_flags_t flags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH | |
184 | ARC_FLAG_PRESCIENT_PREFETCH; | |
440a3eb9 | 185 | int zio_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE; |
96b89346 MA |
186 | |
187 | if (!(td->td_flags & TRAVERSE_PREFETCH_METADATA)) | |
08795ab8 | 188 | return (B_FALSE); |
96b89346 | 189 | /* |
d2d4f855 MA |
190 | * If this bp is before the resume point, it may have already been |
191 | * freed. | |
96b89346 | 192 | */ |
d2d4f855 | 193 | if (resume_skip_check(td, dnp, zb) != RESUME_SKIP_NONE) |
08795ab8 | 194 | return (B_FALSE); |
96b89346 | 195 | if (BP_IS_HOLE(bp) || bp->blk_birth <= td->td_min_txg) |
08795ab8 | 196 | return (B_FALSE); |
96b89346 | 197 | if (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_DNODE) |
08795ab8 | 198 | return (B_FALSE); |
30af21b0 | 199 | ASSERT(!BP_IS_REDACTED(bp)); |
96b89346 | 200 | |
b5256303 TC |
201 | if ((td->td_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp)) |
202 | zio_flags |= ZIO_FLAG_RAW; | |
203 | ||
294f6806 | 204 | (void) arc_read(NULL, td->td_spa, bp, NULL, NULL, |
b5256303 | 205 | ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb); |
08795ab8 | 206 | return (B_TRUE); |
96b89346 MA |
207 | } |
208 | ||
1fa8f795 MA |
209 | static boolean_t |
210 | prefetch_needed(prefetch_data_t *pfd, const blkptr_t *bp) | |
211 | { | |
212 | ASSERT(pfd->pd_flags & TRAVERSE_PREFETCH_DATA); | |
213 | if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp) || | |
30af21b0 | 214 | BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG || BP_IS_REDACTED(bp)) |
1fa8f795 MA |
215 | return (B_FALSE); |
216 | return (B_TRUE); | |
217 | } | |
218 | ||
c7f8f831 BB |
219 | static int |
220 | traverse_visitbp(traverse_data_t *td, const dnode_phys_t *dnp, | |
5dbd68a3 | 221 | const blkptr_t *bp, const zbookmark_phys_t *zb) |
6656bf56 | 222 | { |
fbeddd60 | 223 | int err = 0; |
c7f8f831 | 224 | arc_buf_t *buf = NULL; |
ee2f17aa | 225 | prefetch_data_t *pd = td->td_pfd; |
9ae529ec CS |
226 | |
227 | switch (resume_skip_check(td, dnp, zb)) { | |
228 | case RESUME_SKIP_ALL: | |
229 | return (0); | |
230 | case RESUME_SKIP_CHILDREN: | |
231 | goto post; | |
232 | case RESUME_SKIP_NONE: | |
233 | break; | |
234 | default: | |
235 | ASSERT(0); | |
236 | } | |
6656bf56 | 237 | |
b0bc7a84 | 238 | if (bp->blk_birth == 0) { |
e5fd1dd6 | 239 | /* |
c352ec27 PD |
240 | * Since this block has a birth time of 0 it must be one of |
241 | * two things: a hole created before the | |
242 | * SPA_FEATURE_HOLE_BIRTH feature was enabled, or a hole | |
243 | * which has always been a hole in an object. | |
244 | * | |
245 | * If a file is written sparsely, then the unwritten parts of | |
246 | * the file were "always holes" -- that is, they have been | |
247 | * holes since this object was allocated. However, we (and | |
248 | * our callers) can not necessarily tell when an object was | |
249 | * allocated. Therefore, if it's possible that this object | |
250 | * was freed and then its object number reused, we need to | |
251 | * visit all the holes with birth==0. | |
252 | * | |
253 | * If it isn't possible that the object number was reused, | |
254 | * then if SPA_FEATURE_HOLE_BIRTH was enabled before we wrote | |
255 | * all the blocks we will visit as part of this traversal, | |
256 | * then this hole must have always existed, so we can skip | |
257 | * it. We visit blocks born after (exclusive) td_min_txg. | |
258 | * | |
259 | * Note that the meta-dnode cannot be reallocated. | |
e5fd1dd6 | 260 | */ |
690fe647 BB |
261 | if (!send_holes_without_birth_time && |
262 | (!td->td_realloc_possible || | |
263 | zb->zb_object == DMU_META_DNODE_OBJECT) && | |
264 | td->td_hole_birth_enabled_txg <= td->td_min_txg) | |
e5fd1dd6 | 265 | return (0); |
b0bc7a84 MG |
266 | } else if (bp->blk_birth <= td->td_min_txg) { |
267 | return (0); | |
268 | } | |
269 | ||
ee2f17aa | 270 | if (pd != NULL && !pd->pd_exited && prefetch_needed(pd, bp)) { |
b738bc5a | 271 | uint64_t size = BP_GET_LSIZE(bp); |
ee2f17aa | 272 | mutex_enter(&pd->pd_mtx); |
b738bc5a GW |
273 | ASSERT(pd->pd_bytes_fetched >= 0); |
274 | while (pd->pd_bytes_fetched < size && !pd->pd_exited) | |
8e70975f | 275 | cv_wait_sig(&pd->pd_cv, &pd->pd_mtx); |
b738bc5a | 276 | pd->pd_bytes_fetched -= size; |
ee2f17aa CD |
277 | cv_broadcast(&pd->pd_cv); |
278 | mutex_exit(&pd->pd_mtx); | |
34dc7c2f BB |
279 | } |
280 | ||
30af21b0 | 281 | if (BP_IS_HOLE(bp) || BP_IS_REDACTED(bp)) { |
1fa8f795 MA |
282 | err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg); |
283 | if (err != 0) | |
284 | goto post; | |
285 | return (0); | |
286 | } | |
287 | ||
c7f8f831 | 288 | if (td->td_flags & TRAVERSE_PRE) { |
294f6806 | 289 | err = td->td_func(td->td_spa, NULL, bp, zb, dnp, |
c7f8f831 BB |
290 | td->td_arg); |
291 | if (err == TRAVERSE_VISIT_NO_CHILDREN) | |
572e2857 | 292 | return (0); |
9ae529ec CS |
293 | if (err != 0) |
294 | goto post; | |
34dc7c2f BB |
295 | } |
296 | ||
c7f8f831 | 297 | if (BP_GET_LEVEL(bp) > 0) { |
2a432414 | 298 | uint32_t flags = ARC_FLAG_WAIT; |
08795ab8 JP |
299 | int32_t i, ptidx, pidx; |
300 | uint32_t prefetchlimit; | |
a1687880 | 301 | int32_t epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT; |
5dbd68a3 | 302 | zbookmark_phys_t *czb; |
b128c09f | 303 | |
b5256303 TC |
304 | ASSERT(!BP_IS_PROTECTED(bp)); |
305 | ||
294f6806 | 306 | err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf, |
c7f8f831 | 307 | ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); |
13fe0198 | 308 | if (err != 0) |
fbeddd60 | 309 | goto post; |
a1687880 | 310 | |
79c76d5b | 311 | czb = kmem_alloc(sizeof (zbookmark_phys_t), KM_SLEEP); |
96b89346 | 312 | |
08795ab8 JP |
313 | /* |
314 | * When performing a traversal it is beneficial to | |
315 | * asynchronously read-ahead the upcoming indirect | |
316 | * blocks since they will be needed shortly. However, | |
317 | * since a 128k indirect (non-L0) block may contain up | |
318 | * to 1024 128-byte block pointers, its preferable to not | |
319 | * prefetch them all at once. Issuing a large number of | |
320 | * async reads may effect performance, and the earlier | |
321 | * the indirect blocks are prefetched the less likely | |
322 | * they are to still be resident in the ARC when needed. | |
323 | * Therefore, prefetching indirect blocks is limited to | |
324 | * zfs_traverse_indirect_prefetch_limit=32 blocks by | |
325 | * default. | |
326 | * | |
327 | * pidx: Index for which next prefetch to be issued. | |
328 | * ptidx: Index at which next prefetch to be triggered. | |
329 | */ | |
330 | ptidx = 0; | |
331 | pidx = 1; | |
332 | prefetchlimit = zfs_traverse_indirect_prefetch_limit; | |
96b89346 | 333 | for (i = 0; i < epb; i++) { |
08795ab8 JP |
334 | if (prefetchlimit && i == ptidx) { |
335 | ASSERT3S(ptidx, <=, pidx); | |
336 | for (uint32_t prefetched = 0; pidx < epb && | |
337 | prefetched < prefetchlimit; pidx++) { | |
338 | SET_BOOKMARK(czb, zb->zb_objset, | |
339 | zb->zb_object, zb->zb_level - 1, | |
340 | zb->zb_blkid * epb + pidx); | |
d2d4f855 | 341 | if (traverse_prefetch_metadata(td, dnp, |
08795ab8 JP |
342 | &((blkptr_t *)buf->b_data)[pidx], |
343 | czb) == B_TRUE) { | |
344 | prefetched++; | |
345 | if (prefetched == | |
346 | MAX(prefetchlimit / 2, 1)) | |
347 | ptidx = pidx; | |
348 | } | |
349 | } | |
350 | } | |
b128c09f | 351 | |
08795ab8 | 352 | /* recursively visitbp() blocks below this */ |
a1687880 | 353 | SET_BOOKMARK(czb, zb->zb_objset, zb->zb_object, |
c7f8f831 BB |
354 | zb->zb_level - 1, |
355 | zb->zb_blkid * epb + i); | |
a1687880 BB |
356 | err = traverse_visitbp(td, dnp, |
357 | &((blkptr_t *)buf->b_data)[i], czb); | |
fbeddd60 MA |
358 | if (err != 0) |
359 | break; | |
b128c09f | 360 | } |
a1687880 | 361 | |
5dbd68a3 | 362 | kmem_free(czb, sizeof (zbookmark_phys_t)); |
a1687880 | 363 | |
c7f8f831 | 364 | } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) { |
2a432414 | 365 | uint32_t flags = ARC_FLAG_WAIT; |
b5256303 | 366 | uint32_t zio_flags = ZIO_FLAG_CANFAIL; |
a1687880 BB |
367 | int32_t i; |
368 | int32_t epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT; | |
47dfff3b | 369 | dnode_phys_t *child_dnp; |
b128c09f | 370 | |
b5256303 TC |
371 | /* |
372 | * dnode blocks might have their bonus buffers encrypted, so | |
373 | * we must be careful to honor TRAVERSE_NO_DECRYPT | |
374 | */ | |
375 | if ((td->td_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp)) | |
376 | zio_flags |= ZIO_FLAG_RAW; | |
377 | ||
294f6806 | 378 | err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf, |
b5256303 | 379 | ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb); |
13fe0198 | 380 | if (err != 0) |
fbeddd60 | 381 | goto post; |
b5256303 | 382 | |
47dfff3b | 383 | child_dnp = buf->b_data; |
96b89346 | 384 | |
47dfff3b MA |
385 | for (i = 0; i < epb; i += child_dnp[i].dn_extra_slots + 1) { |
386 | prefetch_dnode_metadata(td, &child_dnp[i], | |
387 | zb->zb_objset, zb->zb_blkid * epb + i); | |
96b89346 | 388 | } |
b128c09f BB |
389 | |
390 | /* recursively visitbp() blocks below this */ | |
47dfff3b | 391 | for (i = 0; i < epb; i += child_dnp[i].dn_extra_slots + 1) { |
30af21b0 | 392 | err = traverse_dnode(td, bp, &child_dnp[i], |
47dfff3b | 393 | zb->zb_objset, zb->zb_blkid * epb + i); |
fbeddd60 MA |
394 | if (err != 0) |
395 | break; | |
34dc7c2f | 396 | } |
c7f8f831 | 397 | } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) { |
b5256303 | 398 | uint32_t zio_flags = ZIO_FLAG_CANFAIL; |
2a432414 | 399 | arc_flags_t flags = ARC_FLAG_WAIT; |
c7f8f831 | 400 | objset_phys_t *osp; |
c7f8f831 | 401 | |
b5256303 TC |
402 | if ((td->td_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp)) |
403 | zio_flags |= ZIO_FLAG_RAW; | |
404 | ||
294f6806 | 405 | err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf, |
b5256303 | 406 | ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb); |
13fe0198 | 407 | if (err != 0) |
fbeddd60 | 408 | goto post; |
c7f8f831 BB |
409 | |
410 | osp = buf->b_data; | |
47dfff3b | 411 | prefetch_dnode_metadata(td, &osp->os_meta_dnode, zb->zb_objset, |
96b89346 | 412 | DMU_META_DNODE_OBJECT); |
c352ec27 PD |
413 | /* |
414 | * See the block comment above for the goal of this variable. | |
415 | * If the maxblkid of the meta-dnode is 0, then we know that | |
416 | * we've never had more than DNODES_PER_BLOCK objects in the | |
417 | * dataset, which means we can't have reused any object ids. | |
418 | */ | |
419 | if (osp->os_meta_dnode.dn_maxblkid == 0) | |
420 | td->td_realloc_possible = B_FALSE; | |
421 | ||
9c5167d1 NF |
422 | if (OBJSET_BUF_HAS_USERUSED(buf)) { |
423 | if (OBJSET_BUF_HAS_PROJECTUSED(buf)) | |
424 | prefetch_dnode_metadata(td, | |
425 | &osp->os_projectused_dnode, | |
426 | zb->zb_objset, DMU_PROJECTUSED_OBJECT); | |
47dfff3b MA |
427 | prefetch_dnode_metadata(td, &osp->os_groupused_dnode, |
428 | zb->zb_objset, DMU_GROUPUSED_OBJECT); | |
429 | prefetch_dnode_metadata(td, &osp->os_userused_dnode, | |
430 | zb->zb_objset, DMU_USERUSED_OBJECT); | |
96b89346 MA |
431 | } |
432 | ||
30af21b0 | 433 | err = traverse_dnode(td, bp, &osp->os_meta_dnode, zb->zb_objset, |
c7f8f831 | 434 | DMU_META_DNODE_OBJECT); |
9c5167d1 NF |
435 | if (err == 0 && OBJSET_BUF_HAS_USERUSED(buf)) { |
436 | if (OBJSET_BUF_HAS_PROJECTUSED(buf)) | |
30af21b0 | 437 | err = traverse_dnode(td, bp, |
9c5167d1 NF |
438 | &osp->os_projectused_dnode, zb->zb_objset, |
439 | DMU_PROJECTUSED_OBJECT); | |
440 | if (err == 0) | |
30af21b0 | 441 | err = traverse_dnode(td, bp, |
9c5167d1 NF |
442 | &osp->os_groupused_dnode, zb->zb_objset, |
443 | DMU_GROUPUSED_OBJECT); | |
444 | if (err == 0) | |
30af21b0 | 445 | err = traverse_dnode(td, bp, |
9c5167d1 NF |
446 | &osp->os_userused_dnode, zb->zb_objset, |
447 | DMU_USERUSED_OBJECT); | |
34dc7c2f | 448 | } |
34dc7c2f BB |
449 | } |
450 | ||
c7f8f831 | 451 | if (buf) |
d3c2ae1c | 452 | arc_buf_destroy(buf, &buf); |
34dc7c2f | 453 | |
9ae529ec | 454 | post: |
fbeddd60 | 455 | if (err == 0 && (td->td_flags & TRAVERSE_POST)) |
294f6806 | 456 | err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg); |
fbeddd60 MA |
457 | |
458 | if ((td->td_flags & TRAVERSE_HARD) && (err == EIO || err == ECKSUM)) { | |
459 | /* | |
460 | * Ignore this disk error as requested by the HARD flag, | |
461 | * and continue traversal. | |
462 | */ | |
463 | err = 0; | |
9ae529ec CS |
464 | } |
465 | ||
fbeddd60 MA |
466 | /* |
467 | * If we are stopping here, set td_resume. | |
468 | */ | |
469 | if (td->td_resume != NULL && err != 0 && !td->td_paused) { | |
470 | td->td_resume->zb_objset = zb->zb_objset; | |
471 | td->td_resume->zb_object = zb->zb_object; | |
472 | td->td_resume->zb_level = 0; | |
473 | /* | |
474 | * If we have stopped on an indirect block (e.g. due to | |
475 | * i/o error), we have not visited anything below it. | |
476 | * Set the bookmark to the first level-0 block that we need | |
477 | * to visit. This way, the resuming code does not need to | |
478 | * deal with resuming from indirect blocks. | |
47dfff3b MA |
479 | * |
480 | * Note, if zb_level <= 0, dnp may be NULL, so we don't want | |
481 | * to dereference it. | |
fbeddd60 | 482 | */ |
47dfff3b MA |
483 | td->td_resume->zb_blkid = zb->zb_blkid; |
484 | if (zb->zb_level > 0) { | |
485 | td->td_resume->zb_blkid <<= zb->zb_level * | |
486 | (dnp->dn_indblkshift - SPA_BLKPTRSHIFT); | |
487 | } | |
fbeddd60 | 488 | td->td_paused = B_TRUE; |
428870ff | 489 | } |
34dc7c2f | 490 | |
fbeddd60 | 491 | return (err); |
34dc7c2f BB |
492 | } |
493 | ||
96b89346 MA |
494 | static void |
495 | prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *dnp, | |
294f6806 | 496 | uint64_t objset, uint64_t object) |
96b89346 MA |
497 | { |
498 | int j; | |
5dbd68a3 | 499 | zbookmark_phys_t czb; |
96b89346 MA |
500 | |
501 | for (j = 0; j < dnp->dn_nblkptr; j++) { | |
502 | SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j); | |
d2d4f855 | 503 | traverse_prefetch_metadata(td, dnp, &dnp->dn_blkptr[j], &czb); |
96b89346 MA |
504 | } |
505 | ||
506 | if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) { | |
507 | SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID); | |
d2d4f855 | 508 | traverse_prefetch_metadata(td, dnp, DN_SPILL_BLKPTR(dnp), &czb); |
96b89346 MA |
509 | } |
510 | } | |
511 | ||
9babb374 | 512 | static int |
30af21b0 | 513 | traverse_dnode(traverse_data_t *td, const blkptr_t *bp, const dnode_phys_t *dnp, |
294f6806 | 514 | uint64_t objset, uint64_t object) |
9babb374 | 515 | { |
fbeddd60 | 516 | int j, err = 0; |
5dbd68a3 | 517 | zbookmark_phys_t czb; |
9babb374 | 518 | |
47dfff3b MA |
519 | if (object != DMU_META_DNODE_OBJECT && td->td_resume != NULL && |
520 | object < td->td_resume->zb_object) | |
521 | return (0); | |
522 | ||
fcff0f35 PD |
523 | if (td->td_flags & TRAVERSE_PRE) { |
524 | SET_BOOKMARK(&czb, objset, object, ZB_DNODE_LEVEL, | |
525 | ZB_DNODE_BLKID); | |
30af21b0 | 526 | err = td->td_func(td->td_spa, NULL, bp, &czb, dnp, |
fcff0f35 PD |
527 | td->td_arg); |
528 | if (err == TRAVERSE_VISIT_NO_CHILDREN) | |
529 | return (0); | |
530 | if (err != 0) | |
531 | return (err); | |
532 | } | |
533 | ||
9babb374 BB |
534 | for (j = 0; j < dnp->dn_nblkptr; j++) { |
535 | SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j); | |
294f6806 | 536 | err = traverse_visitbp(td, dnp, &dnp->dn_blkptr[j], &czb); |
fbeddd60 MA |
537 | if (err != 0) |
538 | break; | |
9babb374 | 539 | } |
428870ff | 540 | |
fcff0f35 | 541 | if (err == 0 && (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) { |
96b89346 | 542 | SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID); |
50c957f7 | 543 | err = traverse_visitbp(td, dnp, DN_SPILL_BLKPTR(dnp), &czb); |
428870ff | 544 | } |
fcff0f35 PD |
545 | |
546 | if (err == 0 && (td->td_flags & TRAVERSE_POST)) { | |
547 | SET_BOOKMARK(&czb, objset, object, ZB_DNODE_LEVEL, | |
548 | ZB_DNODE_BLKID); | |
30af21b0 | 549 | err = td->td_func(td->td_spa, NULL, bp, &czb, dnp, |
fcff0f35 PD |
550 | td->td_arg); |
551 | if (err == TRAVERSE_VISIT_NO_CHILDREN) | |
552 | return (0); | |
553 | if (err != 0) | |
554 | return (err); | |
555 | } | |
fbeddd60 | 556 | return (err); |
9babb374 BB |
557 | } |
558 | ||
b128c09f | 559 | static int |
428870ff | 560 | traverse_prefetcher(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, |
5dbd68a3 | 561 | const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg) |
34dc7c2f | 562 | { |
14e4e3cb | 563 | (void) zilog, (void) dnp; |
572e2857 | 564 | prefetch_data_t *pfd = arg; |
b5256303 | 565 | int zio_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE; |
d4a72f23 TC |
566 | arc_flags_t aflags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH | |
567 | ARC_FLAG_PRESCIENT_PREFETCH; | |
34dc7c2f | 568 | |
b738bc5a | 569 | ASSERT(pfd->pd_bytes_fetched >= 0); |
30af21b0 | 570 | if (zb->zb_level == ZB_DNODE_LEVEL) |
fcff0f35 | 571 | return (0); |
b128c09f | 572 | if (pfd->pd_cancel) |
2e528b49 | 573 | return (SET_ERROR(EINTR)); |
34dc7c2f | 574 | |
1fa8f795 | 575 | if (!prefetch_needed(pfd, bp)) |
34dc7c2f BB |
576 | return (0); |
577 | ||
b128c09f | 578 | mutex_enter(&pfd->pd_mtx); |
b738bc5a | 579 | while (!pfd->pd_cancel && pfd->pd_bytes_fetched >= zfs_pd_bytes_max) |
8e70975f | 580 | cv_wait_sig(&pfd->pd_cv, &pfd->pd_mtx); |
b738bc5a | 581 | pfd->pd_bytes_fetched += BP_GET_LSIZE(bp); |
b128c09f BB |
582 | cv_broadcast(&pfd->pd_cv); |
583 | mutex_exit(&pfd->pd_mtx); | |
34dc7c2f | 584 | |
b5256303 TC |
585 | if ((pfd->pd_flags & TRAVERSE_NO_DECRYPT) && BP_IS_PROTECTED(bp)) |
586 | zio_flags |= ZIO_FLAG_RAW; | |
587 | ||
294f6806 | 588 | (void) arc_read(NULL, spa, bp, NULL, NULL, ZIO_PRIORITY_ASYNC_READ, |
b5256303 | 589 | zio_flags, &aflags, zb); |
34dc7c2f | 590 | |
b128c09f | 591 | return (0); |
34dc7c2f BB |
592 | } |
593 | ||
34dc7c2f | 594 | static void |
b128c09f | 595 | traverse_prefetch_thread(void *arg) |
34dc7c2f | 596 | { |
572e2857 BB |
597 | traverse_data_t *td_main = arg; |
598 | traverse_data_t td = *td_main; | |
5dbd68a3 | 599 | zbookmark_phys_t czb; |
dca8c34d | 600 | fstrans_cookie_t cookie = spl_fstrans_mark(); |
34dc7c2f | 601 | |
b128c09f BB |
602 | td.td_func = traverse_prefetcher; |
603 | td.td_arg = td_main->td_pfd; | |
604 | td.td_pfd = NULL; | |
47dfff3b | 605 | td.td_resume = &td_main->td_pfd->pd_resume; |
34dc7c2f | 606 | |
428870ff BB |
607 | SET_BOOKMARK(&czb, td.td_objset, |
608 | ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); | |
294f6806 | 609 | (void) traverse_visitbp(&td, NULL, td.td_rootbp, &czb); |
34dc7c2f | 610 | |
b128c09f BB |
611 | mutex_enter(&td_main->td_pfd->pd_mtx); |
612 | td_main->td_pfd->pd_exited = B_TRUE; | |
613 | cv_broadcast(&td_main->td_pfd->pd_cv); | |
614 | mutex_exit(&td_main->td_pfd->pd_mtx); | |
dca8c34d | 615 | spl_fstrans_unmark(cookie); |
34dc7c2f BB |
616 | } |
617 | ||
b128c09f BB |
618 | /* |
619 | * NB: dataset must not be changing on-disk (eg, is a snapshot or we are | |
620 | * in syncing context). | |
621 | */ | |
622 | static int | |
9ae529ec | 623 | traverse_impl(spa_t *spa, dsl_dataset_t *ds, uint64_t objset, blkptr_t *rootbp, |
5dbd68a3 | 624 | uint64_t txg_start, zbookmark_phys_t *resume, int flags, |
9ae529ec | 625 | blkptr_cb_t func, void *arg) |
34dc7c2f | 626 | { |
47050a88 BB |
627 | traverse_data_t *td; |
628 | prefetch_data_t *pd; | |
5dbd68a3 | 629 | zbookmark_phys_t *czb; |
b128c09f | 630 | int err; |
34dc7c2f | 631 | |
9ae529ec CS |
632 | ASSERT(ds == NULL || objset == ds->ds_object); |
633 | ASSERT(!(flags & TRAVERSE_PRE) || !(flags & TRAVERSE_POST)); | |
634 | ||
79c76d5b BB |
635 | td = kmem_alloc(sizeof (traverse_data_t), KM_SLEEP); |
636 | pd = kmem_zalloc(sizeof (prefetch_data_t), KM_SLEEP); | |
637 | czb = kmem_alloc(sizeof (zbookmark_phys_t), KM_SLEEP); | |
47050a88 BB |
638 | |
639 | td->td_spa = spa; | |
9ae529ec | 640 | td->td_objset = objset; |
47050a88 BB |
641 | td->td_rootbp = rootbp; |
642 | td->td_min_txg = txg_start; | |
9ae529ec | 643 | td->td_resume = resume; |
47050a88 BB |
644 | td->td_func = func; |
645 | td->td_arg = arg; | |
646 | td->td_pfd = pd; | |
647 | td->td_flags = flags; | |
fbeddd60 | 648 | td->td_paused = B_FALSE; |
c352ec27 | 649 | td->td_realloc_possible = (txg_start == 0 ? B_FALSE : B_TRUE); |
b128c09f | 650 | |
e5fd1dd6 MA |
651 | if (spa_feature_is_active(spa, SPA_FEATURE_HOLE_BIRTH)) { |
652 | VERIFY(spa_feature_enabled_txg(spa, | |
653 | SPA_FEATURE_HOLE_BIRTH, &td->td_hole_birth_enabled_txg)); | |
654 | } else { | |
c352ec27 | 655 | td->td_hole_birth_enabled_txg = UINT64_MAX; |
e5fd1dd6 MA |
656 | } |
657 | ||
47050a88 | 658 | pd->pd_flags = flags; |
47dfff3b MA |
659 | if (resume != NULL) |
660 | pd->pd_resume = *resume; | |
47050a88 BB |
661 | mutex_init(&pd->pd_mtx, NULL, MUTEX_DEFAULT, NULL); |
662 | cv_init(&pd->pd_cv, NULL, CV_DEFAULT, NULL); | |
b128c09f | 663 | |
1421c891 PS |
664 | SET_BOOKMARK(czb, td->td_objset, |
665 | ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); | |
666 | ||
572e2857 | 667 | /* See comment on ZIL traversal in dsl_scan_visitds. */ |
0c66c32d | 668 | if (ds != NULL && !ds->ds_is_snapshot && !BP_IS_HOLE(rootbp)) { |
4938d01d | 669 | zio_flag_t zio_flags = ZIO_FLAG_CANFAIL; |
2a432414 | 670 | uint32_t flags = ARC_FLAG_WAIT; |
13fe0198 MA |
671 | objset_phys_t *osp; |
672 | arc_buf_t *buf; | |
30af21b0 | 673 | ASSERT(!BP_IS_REDACTED(rootbp)); |
572e2857 | 674 | |
b5256303 TC |
675 | if ((td->td_flags & TRAVERSE_NO_DECRYPT) && |
676 | BP_IS_PROTECTED(rootbp)) | |
677 | zio_flags |= ZIO_FLAG_RAW; | |
678 | ||
679 | err = arc_read(NULL, td->td_spa, rootbp, arc_getbuf_func, | |
680 | &buf, ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, czb); | |
d3190c5f CC |
681 | if (err != 0) { |
682 | /* | |
683 | * If both TRAVERSE_HARD and TRAVERSE_PRE are set, | |
684 | * continue to visitbp so that td_func can be called | |
685 | * in pre stage, and err will reset to zero. | |
686 | */ | |
687 | if (!(td->td_flags & TRAVERSE_HARD) || | |
688 | !(td->td_flags & TRAVERSE_PRE)) | |
4338c5c0 | 689 | goto out; |
d3190c5f CC |
690 | } else { |
691 | osp = buf->b_data; | |
692 | traverse_zil(td, &osp->os_zil_header); | |
693 | arc_buf_destroy(buf, &buf); | |
694 | } | |
572e2857 BB |
695 | } |
696 | ||
96b89346 | 697 | if (!(flags & TRAVERSE_PREFETCH_DATA) || |
77d8a0f1 | 698 | taskq_dispatch(spa->spa_prefetch_taskq, traverse_prefetch_thread, |
48d3eb40 | 699 | td, TQ_NOQUEUE) == TASKQID_INVALID) |
47050a88 | 700 | pd->pd_exited = B_TRUE; |
b128c09f | 701 | |
294f6806 | 702 | err = traverse_visitbp(td, NULL, rootbp, czb); |
47050a88 BB |
703 | |
704 | mutex_enter(&pd->pd_mtx); | |
705 | pd->pd_cancel = B_TRUE; | |
706 | cv_broadcast(&pd->pd_cv); | |
707 | while (!pd->pd_exited) | |
8e70975f | 708 | cv_wait_sig(&pd->pd_cv, &pd->pd_mtx); |
47050a88 | 709 | mutex_exit(&pd->pd_mtx); |
4338c5c0 | 710 | out: |
47050a88 BB |
711 | mutex_destroy(&pd->pd_mtx); |
712 | cv_destroy(&pd->pd_cv); | |
b128c09f | 713 | |
5dbd68a3 | 714 | kmem_free(czb, sizeof (zbookmark_phys_t)); |
a1687880 BB |
715 | kmem_free(pd, sizeof (struct prefetch_data)); |
716 | kmem_free(td, sizeof (struct traverse_data)); | |
34dc7c2f | 717 | |
b128c09f | 718 | return (err); |
34dc7c2f BB |
719 | } |
720 | ||
b128c09f BB |
721 | /* |
722 | * NB: dataset must not be changing on-disk (eg, is a snapshot or we are | |
723 | * in syncing context). | |
724 | */ | |
725 | int | |
47dfff3b MA |
726 | traverse_dataset_resume(dsl_dataset_t *ds, uint64_t txg_start, |
727 | zbookmark_phys_t *resume, | |
728 | int flags, blkptr_cb_t func, void *arg) | |
34dc7c2f | 729 | { |
9ae529ec | 730 | return (traverse_impl(ds->ds_dir->dd_pool->dp_spa, ds, ds->ds_object, |
47dfff3b MA |
731 | &dsl_dataset_phys(ds)->ds_bp, txg_start, resume, flags, func, arg)); |
732 | } | |
733 | ||
734 | int | |
735 | traverse_dataset(dsl_dataset_t *ds, uint64_t txg_start, | |
736 | int flags, blkptr_cb_t func, void *arg) | |
737 | { | |
738 | return (traverse_dataset_resume(ds, txg_start, NULL, flags, func, arg)); | |
9ae529ec CS |
739 | } |
740 | ||
741 | int | |
742 | traverse_dataset_destroyed(spa_t *spa, blkptr_t *blkptr, | |
5dbd68a3 | 743 | uint64_t txg_start, zbookmark_phys_t *resume, int flags, |
9ae529ec CS |
744 | blkptr_cb_t func, void *arg) |
745 | { | |
746 | return (traverse_impl(spa, NULL, ZB_DESTROYED_OBJSET, | |
747 | blkptr, txg_start, resume, flags, func, arg)); | |
34dc7c2f BB |
748 | } |
749 | ||
b128c09f BB |
750 | /* |
751 | * NB: pool must not be changing on-disk (eg, from zdb or sync context). | |
752 | */ | |
753 | int | |
428870ff BB |
754 | traverse_pool(spa_t *spa, uint64_t txg_start, int flags, |
755 | blkptr_cb_t func, void *arg) | |
34dc7c2f | 756 | { |
fbeddd60 | 757 | int err; |
b128c09f BB |
758 | dsl_pool_t *dp = spa_get_dsl(spa); |
759 | objset_t *mos = dp->dp_meta_objset; | |
428870ff | 760 | boolean_t hard = (flags & TRAVERSE_HARD); |
b128c09f BB |
761 | |
762 | /* visit the MOS */ | |
9ae529ec CS |
763 | err = traverse_impl(spa, NULL, 0, spa_get_rootblkptr(spa), |
764 | txg_start, NULL, flags, func, arg); | |
13fe0198 | 765 | if (err != 0) |
b128c09f BB |
766 | return (err); |
767 | ||
768 | /* visit each dataset */ | |
1c27024e | 769 | for (uint64_t obj = 1; err == 0; |
47dfff3b | 770 | err = dmu_object_next(mos, &obj, B_FALSE, txg_start)) { |
b128c09f BB |
771 | dmu_object_info_t doi; |
772 | ||
773 | err = dmu_object_info(mos, obj, &doi); | |
13fe0198 | 774 | if (err != 0) { |
fbeddd60 MA |
775 | if (hard) |
776 | continue; | |
777 | break; | |
428870ff | 778 | } |
b128c09f | 779 | |
fa86b5db | 780 | if (doi.doi_bonus_type == DMU_OT_DSL_DATASET) { |
b128c09f | 781 | dsl_dataset_t *ds; |
428870ff BB |
782 | uint64_t txg = txg_start; |
783 | ||
13fe0198 | 784 | dsl_pool_config_enter(dp, FTAG); |
b128c09f | 785 | err = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); |
13fe0198 MA |
786 | dsl_pool_config_exit(dp, FTAG); |
787 | if (err != 0) { | |
fbeddd60 MA |
788 | if (hard) |
789 | continue; | |
790 | break; | |
428870ff | 791 | } |
d683ddbb JG |
792 | if (dsl_dataset_phys(ds)->ds_prev_snap_txg > txg) |
793 | txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; | |
428870ff | 794 | err = traverse_dataset(ds, txg, flags, func, arg); |
b128c09f | 795 | dsl_dataset_rele(ds, FTAG); |
fbeddd60 MA |
796 | if (err != 0) |
797 | break; | |
b128c09f | 798 | } |
34dc7c2f | 799 | } |
b128c09f BB |
800 | if (err == ESRCH) |
801 | err = 0; | |
fbeddd60 | 802 | return (err); |
34dc7c2f | 803 | } |
c28b2279 | 804 | |
c28b2279 BB |
805 | EXPORT_SYMBOL(traverse_dataset); |
806 | EXPORT_SYMBOL(traverse_pool); | |
c409e464 | 807 | |
03fdcb9a MM |
808 | ZFS_MODULE_PARAM(zfs, zfs_, pd_bytes_max, INT, ZMOD_RW, |
809 | "Max number of bytes to prefetch"); | |
6d836e6f | 810 | |
fdc2d303 | 811 | ZFS_MODULE_PARAM(zfs, zfs_, traverse_indirect_prefetch_limit, UINT, ZMOD_RW, |
08795ab8 JP |
812 | "Traverse prefetch number of blocks pointed by indirect block"); |
813 | ||
03fdcb9a | 814 | #if defined(_KERNEL) |
690fe647 | 815 | module_param_named(ignore_hole_birth, send_holes_without_birth_time, int, 0644); |
03fdcb9a MM |
816 | MODULE_PARM_DESC(ignore_hole_birth, |
817 | "Alias for send_holes_without_birth_time"); | |
818 | #endif | |
690fe647 | 819 | |
7ada752a | 820 | /* CSTYLED */ |
03fdcb9a | 821 | ZFS_MODULE_PARAM(zfs, , send_holes_without_birth_time, INT, ZMOD_RW, |
690fe647 | 822 | "Ignore hole_birth txg for zfs send"); |