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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. |
2e528b49 | 23 | * Copyright (c) 2013 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> | |
34 | #include <sys/zio.h> | |
35 | #include <sys/dmu_impl.h> | |
428870ff BB |
36 | #include <sys/sa.h> |
37 | #include <sys/sa_impl.h> | |
b128c09f | 38 | #include <sys/callb.h> |
b0bc7a84 | 39 | #include <sys/zfeature.h> |
b128c09f | 40 | |
572e2857 BB |
41 | int zfs_pd_blks_max = 100; |
42 | ||
43 | typedef struct prefetch_data { | |
b128c09f BB |
44 | kmutex_t pd_mtx; |
45 | kcondvar_t pd_cv; | |
46 | int pd_blks_max; | |
47 | int pd_blks_fetched; | |
48 | int pd_flags; | |
49 | boolean_t pd_cancel; | |
50 | boolean_t pd_exited; | |
572e2857 | 51 | } prefetch_data_t; |
b128c09f | 52 | |
572e2857 | 53 | typedef struct traverse_data { |
b128c09f BB |
54 | spa_t *td_spa; |
55 | uint64_t td_objset; | |
56 | blkptr_t *td_rootbp; | |
57 | uint64_t td_min_txg; | |
9ae529ec | 58 | zbookmark_t *td_resume; |
b128c09f | 59 | int td_flags; |
572e2857 | 60 | prefetch_data_t *td_pfd; |
fbeddd60 | 61 | boolean_t td_paused; |
b128c09f BB |
62 | blkptr_cb_t *td_func; |
63 | void *td_arg; | |
572e2857 | 64 | } traverse_data_t; |
34dc7c2f | 65 | |
572e2857 | 66 | static int traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp, |
294f6806 | 67 | uint64_t objset, uint64_t object); |
96b89346 | 68 | static void prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *, |
294f6806 | 69 | uint64_t objset, uint64_t object); |
9babb374 | 70 | |
428870ff | 71 | static int |
34dc7c2f BB |
72 | traverse_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg) |
73 | { | |
572e2857 | 74 | traverse_data_t *td = arg; |
b128c09f | 75 | zbookmark_t zb; |
34dc7c2f | 76 | |
b0bc7a84 | 77 | if (BP_IS_HOLE(bp)) |
428870ff | 78 | return (0); |
34dc7c2f | 79 | |
b128c09f | 80 | if (claim_txg == 0 && bp->blk_birth >= spa_first_txg(td->td_spa)) |
428870ff BB |
81 | return (0); |
82 | ||
83 | SET_BOOKMARK(&zb, td->td_objset, ZB_ZIL_OBJECT, ZB_ZIL_LEVEL, | |
84 | bp->blk_cksum.zc_word[ZIL_ZC_SEQ]); | |
85 | ||
294f6806 | 86 | (void) td->td_func(td->td_spa, zilog, bp, &zb, NULL, td->td_arg); |
b128c09f | 87 | |
428870ff | 88 | return (0); |
34dc7c2f BB |
89 | } |
90 | ||
428870ff | 91 | static int |
34dc7c2f BB |
92 | traverse_zil_record(zilog_t *zilog, lr_t *lrc, void *arg, uint64_t claim_txg) |
93 | { | |
572e2857 | 94 | traverse_data_t *td = arg; |
34dc7c2f BB |
95 | |
96 | if (lrc->lrc_txtype == TX_WRITE) { | |
97 | lr_write_t *lr = (lr_write_t *)lrc; | |
98 | blkptr_t *bp = &lr->lr_blkptr; | |
b128c09f | 99 | zbookmark_t zb; |
34dc7c2f | 100 | |
b0bc7a84 | 101 | if (BP_IS_HOLE(bp)) |
428870ff | 102 | return (0); |
34dc7c2f | 103 | |
b128c09f | 104 | if (claim_txg == 0 || bp->blk_birth < claim_txg) |
428870ff | 105 | return (0); |
b128c09f | 106 | |
572e2857 BB |
107 | SET_BOOKMARK(&zb, td->td_objset, lr->lr_foid, |
108 | ZB_ZIL_LEVEL, lr->lr_offset / BP_GET_LSIZE(bp)); | |
428870ff | 109 | |
294f6806 | 110 | (void) td->td_func(td->td_spa, zilog, bp, &zb, NULL, |
428870ff | 111 | td->td_arg); |
34dc7c2f | 112 | } |
428870ff | 113 | return (0); |
34dc7c2f BB |
114 | } |
115 | ||
116 | static void | |
572e2857 | 117 | traverse_zil(traverse_data_t *td, zil_header_t *zh) |
34dc7c2f | 118 | { |
34dc7c2f BB |
119 | uint64_t claim_txg = zh->zh_claim_txg; |
120 | zilog_t *zilog; | |
121 | ||
34dc7c2f BB |
122 | /* |
123 | * We only want to visit blocks that have been claimed but not yet | |
428870ff | 124 | * replayed; plus, in read-only mode, blocks that are already stable. |
34dc7c2f | 125 | */ |
fb5f0bc8 | 126 | if (claim_txg == 0 && spa_writeable(td->td_spa)) |
34dc7c2f BB |
127 | return; |
128 | ||
b128c09f | 129 | zilog = zil_alloc(spa_get_dsl(td->td_spa)->dp_meta_objset, zh); |
34dc7c2f | 130 | |
b128c09f | 131 | (void) zil_parse(zilog, traverse_zil_block, traverse_zil_record, td, |
34dc7c2f BB |
132 | claim_txg); |
133 | ||
134 | zil_free(zilog); | |
135 | } | |
136 | ||
9ae529ec CS |
137 | typedef enum resume_skip { |
138 | RESUME_SKIP_ALL, | |
139 | RESUME_SKIP_NONE, | |
140 | RESUME_SKIP_CHILDREN | |
141 | } resume_skip_t; | |
142 | ||
143 | /* | |
144 | * Returns RESUME_SKIP_ALL if td indicates that we are resuming a traversal and | |
145 | * the block indicated by zb does not need to be visited at all. Returns | |
146 | * RESUME_SKIP_CHILDREN if we are resuming a post traversal and we reach the | |
147 | * resume point. This indicates that this block should be visited but not its | |
148 | * children (since they must have been visited in a previous traversal). | |
149 | * Otherwise returns RESUME_SKIP_NONE. | |
150 | */ | |
151 | static resume_skip_t | |
152 | resume_skip_check(traverse_data_t *td, const dnode_phys_t *dnp, | |
153 | const zbookmark_t *zb) | |
154 | { | |
155 | if (td->td_resume != NULL && !ZB_IS_ZERO(td->td_resume)) { | |
156 | /* | |
157 | * If we already visited this bp & everything below, | |
158 | * don't bother doing it again. | |
159 | */ | |
160 | if (zbookmark_is_before(dnp, zb, td->td_resume)) | |
161 | return (RESUME_SKIP_ALL); | |
162 | ||
163 | /* | |
164 | * If we found the block we're trying to resume from, zero | |
165 | * the bookmark out to indicate that we have resumed. | |
166 | */ | |
9ae529ec CS |
167 | if (bcmp(zb, td->td_resume, sizeof (*zb)) == 0) { |
168 | bzero(td->td_resume, sizeof (*zb)); | |
169 | if (td->td_flags & TRAVERSE_POST) | |
170 | return (RESUME_SKIP_CHILDREN); | |
171 | } | |
172 | } | |
173 | return (RESUME_SKIP_NONE); | |
174 | } | |
175 | ||
96b89346 MA |
176 | static void |
177 | traverse_prefetch_metadata(traverse_data_t *td, | |
294f6806 | 178 | const blkptr_t *bp, const zbookmark_t *zb) |
96b89346 MA |
179 | { |
180 | uint32_t flags = ARC_NOWAIT | ARC_PREFETCH; | |
181 | ||
182 | if (!(td->td_flags & TRAVERSE_PREFETCH_METADATA)) | |
183 | return; | |
184 | /* | |
185 | * If we are in the process of resuming, don't prefetch, because | |
186 | * some children will not be needed (and in fact may have already | |
187 | * been freed). | |
188 | */ | |
189 | if (td->td_resume != NULL && !ZB_IS_ZERO(td->td_resume)) | |
190 | return; | |
191 | if (BP_IS_HOLE(bp) || bp->blk_birth <= td->td_min_txg) | |
192 | return; | |
193 | if (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_DNODE) | |
194 | return; | |
195 | ||
294f6806 GW |
196 | (void) arc_read(NULL, td->td_spa, bp, NULL, NULL, |
197 | ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); | |
96b89346 MA |
198 | } |
199 | ||
c7f8f831 BB |
200 | static int |
201 | traverse_visitbp(traverse_data_t *td, const dnode_phys_t *dnp, | |
294f6806 | 202 | const blkptr_t *bp, const zbookmark_t *zb) |
6656bf56 | 203 | { |
fbeddd60 | 204 | int err = 0; |
c7f8f831 | 205 | arc_buf_t *buf = NULL; |
9ae529ec CS |
206 | |
207 | switch (resume_skip_check(td, dnp, zb)) { | |
208 | case RESUME_SKIP_ALL: | |
209 | return (0); | |
210 | case RESUME_SKIP_CHILDREN: | |
211 | goto post; | |
212 | case RESUME_SKIP_NONE: | |
213 | break; | |
214 | default: | |
215 | ASSERT(0); | |
216 | } | |
6656bf56 | 217 | |
b0bc7a84 MG |
218 | if (bp->blk_birth == 0) { |
219 | if (spa_feature_is_active(td->td_spa, SPA_FEATURE_HOLE_BIRTH)) { | |
220 | /* | |
221 | * Since this block has a birth time of 0 it must be a | |
222 | * hole created before the SPA_FEATURE_HOLE_BIRTH | |
223 | * feature was enabled. If SPA_FEATURE_HOLE_BIRTH | |
224 | * was enabled before the min_txg for this traveral we | |
225 | * know the hole must have been created before the | |
226 | * min_txg for this traveral, so we can skip it. If | |
227 | * SPA_FEATURE_HOLE_BIRTH was enabled after the min_txg | |
228 | * for this traveral we cannot tell if the hole was | |
229 | * created before or after the min_txg for this | |
230 | * traversal, so we cannot skip it. | |
231 | */ | |
232 | uint64_t hole_birth_enabled_txg; | |
233 | VERIFY(spa_feature_enabled_txg(td->td_spa, | |
234 | SPA_FEATURE_HOLE_BIRTH, &hole_birth_enabled_txg)); | |
235 | if (hole_birth_enabled_txg < td->td_min_txg) | |
236 | return (0); | |
237 | } | |
238 | } else if (bp->blk_birth <= td->td_min_txg) { | |
239 | return (0); | |
240 | } | |
241 | ||
9ae529ec | 242 | if (BP_IS_HOLE(bp)) { |
b0bc7a84 | 243 | err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg); |
fbeddd60 MA |
244 | if (err != 0) |
245 | goto post; | |
246 | return (0); | |
34dc7c2f BB |
247 | } |
248 | ||
a1687880 BB |
249 | if (td->td_pfd && !td->td_pfd->pd_exited && |
250 | ((td->td_pfd->pd_flags & TRAVERSE_PREFETCH_DATA) || | |
c7f8f831 | 251 | BP_GET_TYPE(bp) == DMU_OT_DNODE || BP_GET_LEVEL(bp) > 0)) { |
a1687880 BB |
252 | mutex_enter(&td->td_pfd->pd_mtx); |
253 | ASSERT(td->td_pfd->pd_blks_fetched >= 0); | |
254 | while (td->td_pfd->pd_blks_fetched == 0 && | |
255 | !td->td_pfd->pd_exited) | |
256 | cv_wait(&td->td_pfd->pd_cv, &td->td_pfd->pd_mtx); | |
257 | td->td_pfd->pd_blks_fetched--; | |
258 | cv_broadcast(&td->td_pfd->pd_cv); | |
259 | mutex_exit(&td->td_pfd->pd_mtx); | |
34dc7c2f BB |
260 | } |
261 | ||
c7f8f831 | 262 | if (td->td_flags & TRAVERSE_PRE) { |
294f6806 | 263 | err = td->td_func(td->td_spa, NULL, bp, zb, dnp, |
c7f8f831 BB |
264 | td->td_arg); |
265 | if (err == TRAVERSE_VISIT_NO_CHILDREN) | |
572e2857 | 266 | return (0); |
9ae529ec CS |
267 | if (err != 0) |
268 | goto post; | |
34dc7c2f BB |
269 | } |
270 | ||
c7f8f831 BB |
271 | if (BP_GET_LEVEL(bp) > 0) { |
272 | uint32_t flags = ARC_WAIT; | |
a1687880 BB |
273 | int32_t i; |
274 | int32_t epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT; | |
275 | zbookmark_t *czb; | |
b128c09f | 276 | |
294f6806 | 277 | err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf, |
c7f8f831 | 278 | ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); |
13fe0198 | 279 | if (err != 0) |
fbeddd60 | 280 | goto post; |
a1687880 BB |
281 | |
282 | czb = kmem_alloc(sizeof (zbookmark_t), KM_PUSHPAGE); | |
96b89346 MA |
283 | |
284 | for (i = 0; i < epb; i++) { | |
a1687880 | 285 | SET_BOOKMARK(czb, zb->zb_objset, zb->zb_object, |
96b89346 MA |
286 | zb->zb_level - 1, |
287 | zb->zb_blkid * epb + i); | |
a1687880 BB |
288 | traverse_prefetch_metadata(td, |
289 | &((blkptr_t *)buf->b_data)[i], czb); | |
96b89346 | 290 | } |
b128c09f BB |
291 | |
292 | /* recursively visitbp() blocks below this */ | |
96b89346 | 293 | for (i = 0; i < epb; i++) { |
a1687880 | 294 | SET_BOOKMARK(czb, zb->zb_objset, zb->zb_object, |
c7f8f831 BB |
295 | zb->zb_level - 1, |
296 | zb->zb_blkid * epb + i); | |
a1687880 BB |
297 | err = traverse_visitbp(td, dnp, |
298 | &((blkptr_t *)buf->b_data)[i], czb); | |
fbeddd60 MA |
299 | if (err != 0) |
300 | break; | |
b128c09f | 301 | } |
a1687880 BB |
302 | |
303 | kmem_free(czb, sizeof (zbookmark_t)); | |
304 | ||
c7f8f831 BB |
305 | } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) { |
306 | uint32_t flags = ARC_WAIT; | |
a1687880 BB |
307 | int32_t i; |
308 | int32_t epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT; | |
b128c09f | 309 | |
294f6806 | 310 | err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf, |
c7f8f831 | 311 | ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); |
13fe0198 | 312 | if (err != 0) |
fbeddd60 | 313 | goto post; |
96b89346 MA |
314 | dnp = buf->b_data; |
315 | ||
316 | for (i = 0; i < epb; i++) { | |
294f6806 | 317 | prefetch_dnode_metadata(td, &dnp[i], zb->zb_objset, |
96b89346 MA |
318 | zb->zb_blkid * epb + i); |
319 | } | |
b128c09f BB |
320 | |
321 | /* recursively visitbp() blocks below this */ | |
96b89346 | 322 | for (i = 0; i < epb; i++) { |
294f6806 | 323 | err = traverse_dnode(td, &dnp[i], zb->zb_objset, |
c7f8f831 | 324 | zb->zb_blkid * epb + i); |
fbeddd60 MA |
325 | if (err != 0) |
326 | break; | |
34dc7c2f | 327 | } |
c7f8f831 BB |
328 | } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) { |
329 | uint32_t flags = ARC_WAIT; | |
330 | objset_phys_t *osp; | |
331 | dnode_phys_t *dnp; | |
332 | ||
294f6806 | 333 | err = arc_read(NULL, td->td_spa, bp, arc_getbuf_func, &buf, |
c7f8f831 | 334 | ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb); |
13fe0198 | 335 | if (err != 0) |
fbeddd60 | 336 | goto post; |
c7f8f831 BB |
337 | |
338 | osp = buf->b_data; | |
339 | dnp = &osp->os_meta_dnode; | |
294f6806 | 340 | prefetch_dnode_metadata(td, dnp, zb->zb_objset, |
96b89346 MA |
341 | DMU_META_DNODE_OBJECT); |
342 | if (arc_buf_size(buf) >= sizeof (objset_phys_t)) { | |
96b89346 | 343 | prefetch_dnode_metadata(td, &osp->os_groupused_dnode, |
8b464649 MA |
344 | zb->zb_objset, DMU_GROUPUSED_OBJECT); |
345 | prefetch_dnode_metadata(td, &osp->os_userused_dnode, | |
294f6806 | 346 | zb->zb_objset, DMU_USERUSED_OBJECT); |
96b89346 MA |
347 | } |
348 | ||
294f6806 | 349 | err = traverse_dnode(td, dnp, zb->zb_objset, |
c7f8f831 | 350 | DMU_META_DNODE_OBJECT); |
c7f8f831 | 351 | if (err == 0 && arc_buf_size(buf) >= sizeof (objset_phys_t)) { |
8b464649 | 352 | dnp = &osp->os_groupused_dnode; |
294f6806 | 353 | err = traverse_dnode(td, dnp, zb->zb_objset, |
8b464649 | 354 | DMU_GROUPUSED_OBJECT); |
9babb374 | 355 | } |
c7f8f831 | 356 | if (err == 0 && arc_buf_size(buf) >= sizeof (objset_phys_t)) { |
8b464649 | 357 | dnp = &osp->os_userused_dnode; |
294f6806 | 358 | err = traverse_dnode(td, dnp, zb->zb_objset, |
8b464649 | 359 | DMU_USERUSED_OBJECT); |
34dc7c2f | 360 | } |
34dc7c2f BB |
361 | } |
362 | ||
c7f8f831 BB |
363 | if (buf) |
364 | (void) arc_buf_remove_ref(buf, &buf); | |
34dc7c2f | 365 | |
9ae529ec | 366 | post: |
fbeddd60 | 367 | if (err == 0 && (td->td_flags & TRAVERSE_POST)) |
294f6806 | 368 | err = td->td_func(td->td_spa, NULL, bp, zb, dnp, td->td_arg); |
fbeddd60 MA |
369 | |
370 | if ((td->td_flags & TRAVERSE_HARD) && (err == EIO || err == ECKSUM)) { | |
371 | /* | |
372 | * Ignore this disk error as requested by the HARD flag, | |
373 | * and continue traversal. | |
374 | */ | |
375 | err = 0; | |
9ae529ec CS |
376 | } |
377 | ||
fbeddd60 MA |
378 | /* |
379 | * If we are stopping here, set td_resume. | |
380 | */ | |
381 | if (td->td_resume != NULL && err != 0 && !td->td_paused) { | |
382 | td->td_resume->zb_objset = zb->zb_objset; | |
383 | td->td_resume->zb_object = zb->zb_object; | |
384 | td->td_resume->zb_level = 0; | |
385 | /* | |
386 | * If we have stopped on an indirect block (e.g. due to | |
387 | * i/o error), we have not visited anything below it. | |
388 | * Set the bookmark to the first level-0 block that we need | |
389 | * to visit. This way, the resuming code does not need to | |
390 | * deal with resuming from indirect blocks. | |
391 | */ | |
392 | td->td_resume->zb_blkid = zb->zb_blkid << | |
393 | (zb->zb_level * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)); | |
394 | td->td_paused = B_TRUE; | |
428870ff | 395 | } |
34dc7c2f | 396 | |
fbeddd60 | 397 | return (err); |
34dc7c2f BB |
398 | } |
399 | ||
96b89346 MA |
400 | static void |
401 | prefetch_dnode_metadata(traverse_data_t *td, const dnode_phys_t *dnp, | |
294f6806 | 402 | uint64_t objset, uint64_t object) |
96b89346 MA |
403 | { |
404 | int j; | |
405 | zbookmark_t czb; | |
406 | ||
407 | for (j = 0; j < dnp->dn_nblkptr; j++) { | |
408 | SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j); | |
294f6806 | 409 | traverse_prefetch_metadata(td, &dnp->dn_blkptr[j], &czb); |
96b89346 MA |
410 | } |
411 | ||
412 | if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) { | |
413 | SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID); | |
294f6806 | 414 | traverse_prefetch_metadata(td, &dnp->dn_spill, &czb); |
96b89346 MA |
415 | } |
416 | } | |
417 | ||
9babb374 | 418 | static int |
572e2857 | 419 | traverse_dnode(traverse_data_t *td, const dnode_phys_t *dnp, |
294f6806 | 420 | uint64_t objset, uint64_t object) |
9babb374 | 421 | { |
fbeddd60 | 422 | int j, err = 0; |
9babb374 BB |
423 | zbookmark_t czb; |
424 | ||
425 | for (j = 0; j < dnp->dn_nblkptr; j++) { | |
426 | SET_BOOKMARK(&czb, objset, object, dnp->dn_nlevels - 1, j); | |
294f6806 | 427 | err = traverse_visitbp(td, dnp, &dnp->dn_blkptr[j], &czb); |
fbeddd60 MA |
428 | if (err != 0) |
429 | break; | |
9babb374 | 430 | } |
428870ff BB |
431 | |
432 | if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) { | |
96b89346 | 433 | SET_BOOKMARK(&czb, objset, object, 0, DMU_SPILL_BLKID); |
294f6806 | 434 | err = traverse_visitbp(td, dnp, &dnp->dn_spill, &czb); |
428870ff | 435 | } |
fbeddd60 | 436 | return (err); |
9babb374 BB |
437 | } |
438 | ||
b128c09f BB |
439 | /* ARGSUSED */ |
440 | static int | |
428870ff | 441 | traverse_prefetcher(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, |
294f6806 | 442 | const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg) |
34dc7c2f | 443 | { |
572e2857 | 444 | prefetch_data_t *pfd = arg; |
b128c09f | 445 | uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH; |
34dc7c2f | 446 | |
b128c09f BB |
447 | ASSERT(pfd->pd_blks_fetched >= 0); |
448 | if (pfd->pd_cancel) | |
2e528b49 | 449 | return (SET_ERROR(EINTR)); |
34dc7c2f | 450 | |
9b67f605 | 451 | if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp) || |
b0bc7a84 | 452 | !((pfd->pd_flags & TRAVERSE_PREFETCH_DATA) || |
428870ff BB |
453 | BP_GET_TYPE(bp) == DMU_OT_DNODE || BP_GET_LEVEL(bp) > 0) || |
454 | BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG) | |
34dc7c2f BB |
455 | return (0); |
456 | ||
b128c09f BB |
457 | mutex_enter(&pfd->pd_mtx); |
458 | while (!pfd->pd_cancel && pfd->pd_blks_fetched >= pfd->pd_blks_max) | |
459 | cv_wait(&pfd->pd_cv, &pfd->pd_mtx); | |
460 | pfd->pd_blks_fetched++; | |
461 | cv_broadcast(&pfd->pd_cv); | |
462 | mutex_exit(&pfd->pd_mtx); | |
34dc7c2f | 463 | |
294f6806 GW |
464 | (void) arc_read(NULL, spa, bp, NULL, NULL, ZIO_PRIORITY_ASYNC_READ, |
465 | ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, &aflags, zb); | |
34dc7c2f | 466 | |
b128c09f | 467 | return (0); |
34dc7c2f BB |
468 | } |
469 | ||
34dc7c2f | 470 | static void |
b128c09f | 471 | traverse_prefetch_thread(void *arg) |
34dc7c2f | 472 | { |
572e2857 BB |
473 | traverse_data_t *td_main = arg; |
474 | traverse_data_t td = *td_main; | |
b128c09f | 475 | zbookmark_t czb; |
34dc7c2f | 476 | |
b128c09f BB |
477 | td.td_func = traverse_prefetcher; |
478 | td.td_arg = td_main->td_pfd; | |
479 | td.td_pfd = NULL; | |
34dc7c2f | 480 | |
428870ff BB |
481 | SET_BOOKMARK(&czb, td.td_objset, |
482 | ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); | |
294f6806 | 483 | (void) traverse_visitbp(&td, NULL, td.td_rootbp, &czb); |
34dc7c2f | 484 | |
b128c09f BB |
485 | mutex_enter(&td_main->td_pfd->pd_mtx); |
486 | td_main->td_pfd->pd_exited = B_TRUE; | |
487 | cv_broadcast(&td_main->td_pfd->pd_cv); | |
488 | mutex_exit(&td_main->td_pfd->pd_mtx); | |
34dc7c2f BB |
489 | } |
490 | ||
b128c09f BB |
491 | /* |
492 | * NB: dataset must not be changing on-disk (eg, is a snapshot or we are | |
493 | * in syncing context). | |
494 | */ | |
495 | static int | |
9ae529ec CS |
496 | traverse_impl(spa_t *spa, dsl_dataset_t *ds, uint64_t objset, blkptr_t *rootbp, |
497 | uint64_t txg_start, zbookmark_t *resume, int flags, | |
498 | blkptr_cb_t func, void *arg) | |
34dc7c2f | 499 | { |
47050a88 BB |
500 | traverse_data_t *td; |
501 | prefetch_data_t *pd; | |
502 | zbookmark_t *czb; | |
b128c09f | 503 | int err; |
34dc7c2f | 504 | |
9ae529ec CS |
505 | ASSERT(ds == NULL || objset == ds->ds_object); |
506 | ASSERT(!(flags & TRAVERSE_PRE) || !(flags & TRAVERSE_POST)); | |
507 | ||
96b89346 MA |
508 | /* |
509 | * The data prefetching mechanism (the prefetch thread) is incompatible | |
510 | * with resuming from a bookmark. | |
511 | */ | |
512 | ASSERT(resume == NULL || !(flags & TRAVERSE_PREFETCH_DATA)); | |
513 | ||
a1687880 BB |
514 | td = kmem_alloc(sizeof (traverse_data_t), KM_PUSHPAGE); |
515 | pd = kmem_zalloc(sizeof (prefetch_data_t), KM_PUSHPAGE); | |
516 | czb = kmem_alloc(sizeof (zbookmark_t), KM_PUSHPAGE); | |
47050a88 BB |
517 | |
518 | td->td_spa = spa; | |
9ae529ec | 519 | td->td_objset = objset; |
47050a88 BB |
520 | td->td_rootbp = rootbp; |
521 | td->td_min_txg = txg_start; | |
9ae529ec | 522 | td->td_resume = resume; |
47050a88 BB |
523 | td->td_func = func; |
524 | td->td_arg = arg; | |
525 | td->td_pfd = pd; | |
526 | td->td_flags = flags; | |
fbeddd60 | 527 | td->td_paused = B_FALSE; |
b128c09f | 528 | |
47050a88 BB |
529 | pd->pd_blks_max = zfs_pd_blks_max; |
530 | pd->pd_flags = flags; | |
531 | mutex_init(&pd->pd_mtx, NULL, MUTEX_DEFAULT, NULL); | |
532 | cv_init(&pd->pd_cv, NULL, CV_DEFAULT, NULL); | |
b128c09f | 533 | |
1421c891 PS |
534 | SET_BOOKMARK(czb, td->td_objset, |
535 | ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); | |
536 | ||
572e2857 | 537 | /* See comment on ZIL traversal in dsl_scan_visitds. */ |
13fe0198 MA |
538 | if (ds != NULL && !dsl_dataset_is_snapshot(ds) && !BP_IS_HOLE(rootbp)) { |
539 | uint32_t flags = ARC_WAIT; | |
540 | objset_phys_t *osp; | |
541 | arc_buf_t *buf; | |
572e2857 | 542 | |
13fe0198 MA |
543 | err = arc_read(NULL, td->td_spa, rootbp, |
544 | arc_getbuf_func, &buf, | |
1421c891 | 545 | ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, czb); |
13fe0198 | 546 | if (err != 0) |
572e2857 BB |
547 | return (err); |
548 | ||
13fe0198 MA |
549 | osp = buf->b_data; |
550 | traverse_zil(td, &osp->os_zil_header); | |
551 | (void) arc_buf_remove_ref(buf, &buf); | |
572e2857 BB |
552 | } |
553 | ||
96b89346 | 554 | if (!(flags & TRAVERSE_PREFETCH_DATA) || |
b128c09f | 555 | 0 == taskq_dispatch(system_taskq, traverse_prefetch_thread, |
47050a88 BB |
556 | td, TQ_NOQUEUE)) |
557 | pd->pd_exited = B_TRUE; | |
b128c09f | 558 | |
294f6806 | 559 | err = traverse_visitbp(td, NULL, rootbp, czb); |
47050a88 BB |
560 | |
561 | mutex_enter(&pd->pd_mtx); | |
562 | pd->pd_cancel = B_TRUE; | |
563 | cv_broadcast(&pd->pd_cv); | |
564 | while (!pd->pd_exited) | |
565 | cv_wait(&pd->pd_cv, &pd->pd_mtx); | |
566 | mutex_exit(&pd->pd_mtx); | |
b128c09f | 567 | |
47050a88 BB |
568 | mutex_destroy(&pd->pd_mtx); |
569 | cv_destroy(&pd->pd_cv); | |
b128c09f | 570 | |
a1687880 BB |
571 | kmem_free(czb, sizeof (zbookmark_t)); |
572 | kmem_free(pd, sizeof (struct prefetch_data)); | |
573 | kmem_free(td, sizeof (struct traverse_data)); | |
34dc7c2f | 574 | |
b128c09f | 575 | return (err); |
34dc7c2f BB |
576 | } |
577 | ||
b128c09f BB |
578 | /* |
579 | * NB: dataset must not be changing on-disk (eg, is a snapshot or we are | |
580 | * in syncing context). | |
581 | */ | |
582 | int | |
583 | traverse_dataset(dsl_dataset_t *ds, uint64_t txg_start, int flags, | |
584 | blkptr_cb_t func, void *arg) | |
34dc7c2f | 585 | { |
9ae529ec CS |
586 | return (traverse_impl(ds->ds_dir->dd_pool->dp_spa, ds, ds->ds_object, |
587 | &ds->ds_phys->ds_bp, txg_start, NULL, flags, func, arg)); | |
588 | } | |
589 | ||
590 | int | |
591 | traverse_dataset_destroyed(spa_t *spa, blkptr_t *blkptr, | |
592 | uint64_t txg_start, zbookmark_t *resume, int flags, | |
593 | blkptr_cb_t func, void *arg) | |
594 | { | |
595 | return (traverse_impl(spa, NULL, ZB_DESTROYED_OBJSET, | |
596 | blkptr, txg_start, resume, flags, func, arg)); | |
34dc7c2f BB |
597 | } |
598 | ||
b128c09f BB |
599 | /* |
600 | * NB: pool must not be changing on-disk (eg, from zdb or sync context). | |
601 | */ | |
602 | int | |
428870ff BB |
603 | traverse_pool(spa_t *spa, uint64_t txg_start, int flags, |
604 | blkptr_cb_t func, void *arg) | |
34dc7c2f | 605 | { |
fbeddd60 | 606 | int err; |
b128c09f BB |
607 | uint64_t obj; |
608 | dsl_pool_t *dp = spa_get_dsl(spa); | |
609 | objset_t *mos = dp->dp_meta_objset; | |
428870ff | 610 | boolean_t hard = (flags & TRAVERSE_HARD); |
b128c09f BB |
611 | |
612 | /* visit the MOS */ | |
9ae529ec CS |
613 | err = traverse_impl(spa, NULL, 0, spa_get_rootblkptr(spa), |
614 | txg_start, NULL, flags, func, arg); | |
13fe0198 | 615 | if (err != 0) |
b128c09f BB |
616 | return (err); |
617 | ||
618 | /* visit each dataset */ | |
fbeddd60 | 619 | for (obj = 1; err == 0; |
428870ff | 620 | err = dmu_object_next(mos, &obj, FALSE, txg_start)) { |
b128c09f BB |
621 | dmu_object_info_t doi; |
622 | ||
623 | err = dmu_object_info(mos, obj, &doi); | |
13fe0198 | 624 | if (err != 0) { |
fbeddd60 MA |
625 | if (hard) |
626 | continue; | |
627 | break; | |
428870ff | 628 | } |
b128c09f | 629 | |
fa86b5db | 630 | if (doi.doi_bonus_type == DMU_OT_DSL_DATASET) { |
b128c09f | 631 | dsl_dataset_t *ds; |
428870ff BB |
632 | uint64_t txg = txg_start; |
633 | ||
13fe0198 | 634 | dsl_pool_config_enter(dp, FTAG); |
b128c09f | 635 | err = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); |
13fe0198 MA |
636 | dsl_pool_config_exit(dp, FTAG); |
637 | if (err != 0) { | |
fbeddd60 MA |
638 | if (hard) |
639 | continue; | |
640 | break; | |
428870ff BB |
641 | } |
642 | if (ds->ds_phys->ds_prev_snap_txg > txg) | |
643 | txg = ds->ds_phys->ds_prev_snap_txg; | |
644 | err = traverse_dataset(ds, txg, flags, func, arg); | |
b128c09f | 645 | dsl_dataset_rele(ds, FTAG); |
fbeddd60 MA |
646 | if (err != 0) |
647 | break; | |
b128c09f | 648 | } |
34dc7c2f | 649 | } |
b128c09f BB |
650 | if (err == ESRCH) |
651 | err = 0; | |
fbeddd60 | 652 | return (err); |
34dc7c2f | 653 | } |
c28b2279 BB |
654 | |
655 | #if defined(_KERNEL) && defined(HAVE_SPL) | |
656 | EXPORT_SYMBOL(traverse_dataset); | |
657 | EXPORT_SYMBOL(traverse_pool); | |
c409e464 BB |
658 | |
659 | module_param(zfs_pd_blks_max, int, 0644); | |
660 | MODULE_PARM_DESC(zfs_pd_blks_max, "Max number of blocks to prefetch"); | |
c28b2279 | 661 | #endif |