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428870ff 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 | /* | |
22 | * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. | |
30af21b0 | 23 | * Copyright (c) 2011, 2018 by Delphix. All rights reserved. |
7c9abfa7 | 24 | * Copyright 2016 Gary Mills |
0ea05c64 | 25 | * Copyright (c) 2017 Datto Inc. |
12fa0466 | 26 | * Copyright 2017 Joyent, Inc. |
428870ff BB |
27 | */ |
28 | ||
29 | #include <sys/dsl_scan.h> | |
30 | #include <sys/dsl_pool.h> | |
31 | #include <sys/dsl_dataset.h> | |
32 | #include <sys/dsl_prop.h> | |
33 | #include <sys/dsl_dir.h> | |
34 | #include <sys/dsl_synctask.h> | |
35 | #include <sys/dnode.h> | |
36 | #include <sys/dmu_tx.h> | |
37 | #include <sys/dmu_objset.h> | |
38 | #include <sys/arc.h> | |
39 | #include <sys/zap.h> | |
40 | #include <sys/zio.h> | |
41 | #include <sys/zfs_context.h> | |
42 | #include <sys/fs/zfs.h> | |
43 | #include <sys/zfs_znode.h> | |
44 | #include <sys/spa_impl.h> | |
45 | #include <sys/vdev_impl.h> | |
46 | #include <sys/zil_impl.h> | |
47 | #include <sys/zio_checksum.h> | |
48 | #include <sys/ddt.h> | |
49 | #include <sys/sa.h> | |
50 | #include <sys/sa_impl.h> | |
9ae529ec | 51 | #include <sys/zfeature.h> |
a6255b7f | 52 | #include <sys/abd.h> |
d4a72f23 | 53 | #include <sys/range_tree.h> |
428870ff BB |
54 | #ifdef _KERNEL |
55 | #include <sys/zfs_vfsops.h> | |
56 | #endif | |
57 | ||
d4a72f23 TC |
58 | /* |
59 | * Grand theory statement on scan queue sorting | |
60 | * | |
61 | * Scanning is implemented by recursively traversing all indirection levels | |
62 | * in an object and reading all blocks referenced from said objects. This | |
63 | * results in us approximately traversing the object from lowest logical | |
64 | * offset to the highest. For best performance, we would want the logical | |
65 | * blocks to be physically contiguous. However, this is frequently not the | |
66 | * case with pools given the allocation patterns of copy-on-write filesystems. | |
67 | * So instead, we put the I/Os into a reordering queue and issue them in a | |
68 | * way that will most benefit physical disks (LBA-order). | |
69 | * | |
70 | * Queue management: | |
71 | * | |
72 | * Ideally, we would want to scan all metadata and queue up all block I/O | |
73 | * prior to starting to issue it, because that allows us to do an optimal | |
74 | * sorting job. This can however consume large amounts of memory. Therefore | |
75 | * we continuously monitor the size of the queues and constrain them to 5% | |
76 | * (zfs_scan_mem_lim_fact) of physmem. If the queues grow larger than this | |
77 | * limit, we clear out a few of the largest extents at the head of the queues | |
78 | * to make room for more scanning. Hopefully, these extents will be fairly | |
79 | * large and contiguous, allowing us to approach sequential I/O throughput | |
80 | * even without a fully sorted tree. | |
81 | * | |
82 | * Metadata scanning takes place in dsl_scan_visit(), which is called from | |
83 | * dsl_scan_sync() every spa_sync(). If we have either fully scanned all | |
84 | * metadata on the pool, or we need to make room in memory because our | |
85 | * queues are too large, dsl_scan_visit() is postponed and | |
86 | * scan_io_queues_run() is called from dsl_scan_sync() instead. This implies | |
87 | * that metadata scanning and queued I/O issuing are mutually exclusive. This | |
88 | * allows us to provide maximum sequential I/O throughput for the majority of | |
89 | * I/O's issued since sequential I/O performance is significantly negatively | |
90 | * impacted if it is interleaved with random I/O. | |
91 | * | |
92 | * Implementation Notes | |
93 | * | |
94 | * One side effect of the queued scanning algorithm is that the scanning code | |
95 | * needs to be notified whenever a block is freed. This is needed to allow | |
96 | * the scanning code to remove these I/Os from the issuing queue. Additionally, | |
97 | * we do not attempt to queue gang blocks to be issued sequentially since this | |
13a2ff27 | 98 | * is very hard to do and would have an extremely limited performance benefit. |
d4a72f23 TC |
99 | * Instead, we simply issue gang I/Os as soon as we find them using the legacy |
100 | * algorithm. | |
101 | * | |
102 | * Backwards compatibility | |
103 | * | |
104 | * This new algorithm is backwards compatible with the legacy on-disk data | |
105 | * structures (and therefore does not require a new feature flag). | |
106 | * Periodically during scanning (see zfs_scan_checkpoint_intval), the scan | |
107 | * will stop scanning metadata (in logical order) and wait for all outstanding | |
108 | * sorted I/O to complete. Once this is done, we write out a checkpoint | |
109 | * bookmark, indicating that we have scanned everything logically before it. | |
110 | * If the pool is imported on a machine without the new sorting algorithm, | |
111 | * the scan simply resumes from the last checkpoint using the legacy algorithm. | |
112 | */ | |
113 | ||
5dbd68a3 MA |
114 | typedef int (scan_cb_t)(dsl_pool_t *, const blkptr_t *, |
115 | const zbookmark_phys_t *); | |
428870ff | 116 | |
428870ff | 117 | static scan_cb_t dsl_scan_scrub_cb; |
428870ff | 118 | |
d4a72f23 TC |
119 | static int scan_ds_queue_compare(const void *a, const void *b); |
120 | static int scan_prefetch_queue_compare(const void *a, const void *b); | |
121 | static void scan_ds_queue_clear(dsl_scan_t *scn); | |
d6496040 | 122 | static void scan_ds_prefetch_queue_clear(dsl_scan_t *scn); |
d4a72f23 TC |
123 | static boolean_t scan_ds_queue_contains(dsl_scan_t *scn, uint64_t dsobj, |
124 | uint64_t *txg); | |
125 | static void scan_ds_queue_insert(dsl_scan_t *scn, uint64_t dsobj, uint64_t txg); | |
126 | static void scan_ds_queue_remove(dsl_scan_t *scn, uint64_t dsobj); | |
127 | static void scan_ds_queue_sync(dsl_scan_t *scn, dmu_tx_t *tx); | |
f90a30ad | 128 | static uint64_t dsl_scan_count_leaves(vdev_t *vd); |
d4a72f23 TC |
129 | |
130 | extern int zfs_vdev_async_write_active_min_dirty_percent; | |
131 | ||
132 | /* | |
133 | * By default zfs will check to ensure it is not over the hard memory | |
134 | * limit before each txg. If finer-grained control of this is needed | |
135 | * this value can be set to 1 to enable checking before scanning each | |
136 | * block. | |
137 | */ | |
138 | int zfs_scan_strict_mem_lim = B_FALSE; | |
139 | ||
140 | /* | |
141 | * Maximum number of parallelly executed bytes per leaf vdev. We attempt | |
142 | * to strike a balance here between keeping the vdev queues full of I/Os | |
143 | * at all times and not overflowing the queues to cause long latency, | |
144 | * which would cause long txg sync times. No matter what, we will not | |
145 | * overload the drives with I/O, since that is protected by | |
146 | * zfs_vdev_scrub_max_active. | |
147 | */ | |
148 | unsigned long zfs_scan_vdev_limit = 4 << 20; | |
149 | ||
150 | int zfs_scan_issue_strategy = 0; | |
151 | int zfs_scan_legacy = B_FALSE; /* don't queue & sort zios, go direct */ | |
63f88c12 | 152 | unsigned long zfs_scan_max_ext_gap = 2 << 20; /* in bytes */ |
d4a72f23 TC |
153 | |
154 | /* | |
155 | * fill_weight is non-tunable at runtime, so we copy it at module init from | |
156 | * zfs_scan_fill_weight. Runtime adjustments to zfs_scan_fill_weight would | |
157 | * break queue sorting. | |
158 | */ | |
159 | int zfs_scan_fill_weight = 3; | |
160 | static uint64_t fill_weight; | |
161 | ||
162 | /* See dsl_scan_should_clear() for details on the memory limit tunables */ | |
163 | uint64_t zfs_scan_mem_lim_min = 16 << 20; /* bytes */ | |
164 | uint64_t zfs_scan_mem_lim_soft_max = 128 << 20; /* bytes */ | |
165 | int zfs_scan_mem_lim_fact = 20; /* fraction of physmem */ | |
166 | int zfs_scan_mem_lim_soft_fact = 20; /* fraction of mem lim above */ | |
572e2857 | 167 | |
d4a72f23 | 168 | int zfs_scrub_min_time_ms = 1000; /* min millisecs to scrub per txg */ |
a1d477c2 | 169 | int zfs_obsolete_min_time_ms = 500; /* min millisecs to obsolete per txg */ |
428870ff BB |
170 | int zfs_free_min_time_ms = 1000; /* min millisecs to free per txg */ |
171 | int zfs_resilver_min_time_ms = 3000; /* min millisecs to resilver per txg */ | |
d4a72f23 | 172 | int zfs_scan_checkpoint_intval = 7200; /* in seconds */ |
cef48f14 | 173 | int zfs_scan_suspend_progress = 0; /* set to prevent scans from progressing */ |
c409e464 | 174 | int zfs_no_scrub_io = B_FALSE; /* set to disable scrub i/o */ |
fbeddd60 | 175 | int zfs_no_scrub_prefetch = B_FALSE; /* set to disable scrub prefetch */ |
428870ff | 176 | enum ddt_class zfs_scrub_ddt_class_max = DDT_CLASS_DUPLICATE; |
36283ca2 | 177 | /* max number of blocks to free in a single TXG */ |
a1d477c2 | 178 | unsigned long zfs_async_block_max_blocks = 100000; |
428870ff | 179 | |
80a91e74 TC |
180 | int zfs_resilver_disable_defer = 0; /* set to disable resilver deferring */ |
181 | ||
d4a72f23 TC |
182 | /* |
183 | * We wait a few txgs after importing a pool to begin scanning so that | |
184 | * the import / mounting code isn't held up by scrub / resilver IO. | |
185 | * Unfortunately, it is a bit difficult to determine exactly how long | |
186 | * this will take since userspace will trigger fs mounts asynchronously | |
187 | * and the kernel will create zvol minors asynchronously. As a result, | |
188 | * the value provided here is a bit arbitrary, but represents a | |
189 | * reasonable estimate of how many txgs it will take to finish fully | |
190 | * importing a pool | |
191 | */ | |
192 | #define SCAN_IMPORT_WAIT_TXGS 5 | |
193 | ||
428870ff BB |
194 | #define DSL_SCAN_IS_SCRUB_RESILVER(scn) \ |
195 | ((scn)->scn_phys.scn_func == POOL_SCAN_SCRUB || \ | |
196 | (scn)->scn_phys.scn_func == POOL_SCAN_RESILVER) | |
197 | ||
ba5ad9a4 GW |
198 | /* |
199 | * Enable/disable the processing of the free_bpobj object. | |
200 | */ | |
201 | int zfs_free_bpobj_enabled = 1; | |
202 | ||
428870ff BB |
203 | /* the order has to match pool_scan_type */ |
204 | static scan_cb_t *scan_funcs[POOL_SCAN_FUNCS] = { | |
205 | NULL, | |
206 | dsl_scan_scrub_cb, /* POOL_SCAN_SCRUB */ | |
207 | dsl_scan_scrub_cb, /* POOL_SCAN_RESILVER */ | |
208 | }; | |
209 | ||
d4a72f23 TC |
210 | /* In core node for the scn->scn_queue. Represents a dataset to be scanned */ |
211 | typedef struct { | |
212 | uint64_t sds_dsobj; | |
213 | uint64_t sds_txg; | |
214 | avl_node_t sds_node; | |
215 | } scan_ds_t; | |
216 | ||
217 | /* | |
218 | * This controls what conditions are placed on dsl_scan_sync_state(): | |
219 | * SYNC_OPTIONAL) write out scn_phys iff scn_bytes_pending == 0 | |
220 | * SYNC_MANDATORY) write out scn_phys always. scn_bytes_pending must be 0. | |
221 | * SYNC_CACHED) if scn_bytes_pending == 0, write out scn_phys. Otherwise | |
222 | * write out the scn_phys_cached version. | |
223 | * See dsl_scan_sync_state for details. | |
224 | */ | |
225 | typedef enum { | |
226 | SYNC_OPTIONAL, | |
227 | SYNC_MANDATORY, | |
228 | SYNC_CACHED | |
229 | } state_sync_type_t; | |
230 | ||
231 | /* | |
232 | * This struct represents the minimum information needed to reconstruct a | |
233 | * zio for sequential scanning. This is useful because many of these will | |
234 | * accumulate in the sequential IO queues before being issued, so saving | |
235 | * memory matters here. | |
236 | */ | |
237 | typedef struct scan_io { | |
238 | /* fields from blkptr_t */ | |
d4a72f23 TC |
239 | uint64_t sio_blk_prop; |
240 | uint64_t sio_phys_birth; | |
241 | uint64_t sio_birth; | |
242 | zio_cksum_t sio_cksum; | |
ab7615d9 | 243 | uint32_t sio_nr_dvas; |
d4a72f23 TC |
244 | |
245 | /* fields from zio_t */ | |
ab7615d9 | 246 | uint32_t sio_flags; |
d4a72f23 TC |
247 | zbookmark_phys_t sio_zb; |
248 | ||
249 | /* members for queue sorting */ | |
250 | union { | |
ab7615d9 | 251 | avl_node_t sio_addr_node; /* link into issuing queue */ |
d4a72f23 TC |
252 | list_node_t sio_list_node; /* link for issuing to disk */ |
253 | } sio_nodes; | |
ab7615d9 TC |
254 | |
255 | /* | |
256 | * There may be up to SPA_DVAS_PER_BP DVAs here from the bp, | |
257 | * depending on how many were in the original bp. Only the | |
258 | * first DVA is really used for sorting and issuing purposes. | |
259 | * The other DVAs (if provided) simply exist so that the zio | |
260 | * layer can find additional copies to repair from in the | |
261 | * event of an error. This array must go at the end of the | |
262 | * struct to allow this for the variable number of elements. | |
263 | */ | |
264 | dva_t sio_dva[0]; | |
d4a72f23 TC |
265 | } scan_io_t; |
266 | ||
ab7615d9 TC |
267 | #define SIO_SET_OFFSET(sio, x) DVA_SET_OFFSET(&(sio)->sio_dva[0], x) |
268 | #define SIO_SET_ASIZE(sio, x) DVA_SET_ASIZE(&(sio)->sio_dva[0], x) | |
269 | #define SIO_GET_OFFSET(sio) DVA_GET_OFFSET(&(sio)->sio_dva[0]) | |
270 | #define SIO_GET_ASIZE(sio) DVA_GET_ASIZE(&(sio)->sio_dva[0]) | |
271 | #define SIO_GET_END_OFFSET(sio) \ | |
272 | (SIO_GET_OFFSET(sio) + SIO_GET_ASIZE(sio)) | |
273 | #define SIO_GET_MUSED(sio) \ | |
274 | (sizeof (scan_io_t) + ((sio)->sio_nr_dvas * sizeof (dva_t))) | |
275 | ||
d4a72f23 TC |
276 | struct dsl_scan_io_queue { |
277 | dsl_scan_t *q_scn; /* associated dsl_scan_t */ | |
278 | vdev_t *q_vd; /* top-level vdev that this queue represents */ | |
279 | ||
280 | /* trees used for sorting I/Os and extents of I/Os */ | |
281 | range_tree_t *q_exts_by_addr; | |
282 | avl_tree_t q_exts_by_size; | |
283 | avl_tree_t q_sios_by_addr; | |
ab7615d9 | 284 | uint64_t q_sio_memused; |
d4a72f23 TC |
285 | |
286 | /* members for zio rate limiting */ | |
287 | uint64_t q_maxinflight_bytes; | |
288 | uint64_t q_inflight_bytes; | |
289 | kcondvar_t q_zio_cv; /* used under vd->vdev_scan_io_queue_lock */ | |
290 | ||
291 | /* per txg statistics */ | |
292 | uint64_t q_total_seg_size_this_txg; | |
293 | uint64_t q_segs_this_txg; | |
294 | uint64_t q_total_zio_size_this_txg; | |
295 | uint64_t q_zios_this_txg; | |
296 | }; | |
297 | ||
298 | /* private data for dsl_scan_prefetch_cb() */ | |
299 | typedef struct scan_prefetch_ctx { | |
c13060e4 | 300 | zfs_refcount_t spc_refcnt; /* refcount for memory management */ |
d4a72f23 TC |
301 | dsl_scan_t *spc_scn; /* dsl_scan_t for the pool */ |
302 | boolean_t spc_root; /* is this prefetch for an objset? */ | |
303 | uint8_t spc_indblkshift; /* dn_indblkshift of current dnode */ | |
304 | uint16_t spc_datablkszsec; /* dn_idatablkszsec of current dnode */ | |
305 | } scan_prefetch_ctx_t; | |
306 | ||
307 | /* private data for dsl_scan_prefetch() */ | |
308 | typedef struct scan_prefetch_issue_ctx { | |
309 | avl_node_t spic_avl_node; /* link into scn->scn_prefetch_queue */ | |
310 | scan_prefetch_ctx_t *spic_spc; /* spc for the callback */ | |
311 | blkptr_t spic_bp; /* bp to prefetch */ | |
312 | zbookmark_phys_t spic_zb; /* bookmark to prefetch */ | |
313 | } scan_prefetch_issue_ctx_t; | |
314 | ||
315 | static void scan_exec_io(dsl_pool_t *dp, const blkptr_t *bp, int zio_flags, | |
316 | const zbookmark_phys_t *zb, dsl_scan_io_queue_t *queue); | |
317 | static void scan_io_queue_insert_impl(dsl_scan_io_queue_t *queue, | |
318 | scan_io_t *sio); | |
319 | ||
320 | static dsl_scan_io_queue_t *scan_io_queue_create(vdev_t *vd); | |
321 | static void scan_io_queues_destroy(dsl_scan_t *scn); | |
322 | ||
ab7615d9 TC |
323 | static kmem_cache_t *sio_cache[SPA_DVAS_PER_BP]; |
324 | ||
325 | /* sio->sio_nr_dvas must be set so we know which cache to free from */ | |
326 | static void | |
327 | sio_free(scan_io_t *sio) | |
328 | { | |
329 | ASSERT3U(sio->sio_nr_dvas, >, 0); | |
330 | ASSERT3U(sio->sio_nr_dvas, <=, SPA_DVAS_PER_BP); | |
331 | ||
332 | kmem_cache_free(sio_cache[sio->sio_nr_dvas - 1], sio); | |
333 | } | |
334 | ||
335 | /* It is up to the caller to set sio->sio_nr_dvas for freeing */ | |
336 | static scan_io_t * | |
337 | sio_alloc(unsigned short nr_dvas) | |
338 | { | |
339 | ASSERT3U(nr_dvas, >, 0); | |
340 | ASSERT3U(nr_dvas, <=, SPA_DVAS_PER_BP); | |
341 | ||
342 | return (kmem_cache_alloc(sio_cache[nr_dvas - 1], KM_SLEEP)); | |
343 | } | |
d4a72f23 TC |
344 | |
345 | void | |
346 | scan_init(void) | |
347 | { | |
348 | /* | |
349 | * This is used in ext_size_compare() to weight segments | |
350 | * based on how sparse they are. This cannot be changed | |
351 | * mid-scan and the tree comparison functions don't currently | |
13a2ff27 | 352 | * have a mechanism for passing additional context to the |
d4a72f23 | 353 | * compare functions. Thus we store this value globally and |
13a2ff27 | 354 | * we only allow it to be set at module initialization time |
d4a72f23 TC |
355 | */ |
356 | fill_weight = zfs_scan_fill_weight; | |
357 | ||
ab7615d9 TC |
358 | for (int i = 0; i < SPA_DVAS_PER_BP; i++) { |
359 | char name[36]; | |
360 | ||
361 | (void) sprintf(name, "sio_cache_%d", i); | |
362 | sio_cache[i] = kmem_cache_create(name, | |
363 | (sizeof (scan_io_t) + ((i + 1) * sizeof (dva_t))), | |
364 | 0, NULL, NULL, NULL, NULL, NULL, 0); | |
365 | } | |
d4a72f23 TC |
366 | } |
367 | ||
368 | void | |
369 | scan_fini(void) | |
370 | { | |
ab7615d9 TC |
371 | for (int i = 0; i < SPA_DVAS_PER_BP; i++) { |
372 | kmem_cache_destroy(sio_cache[i]); | |
373 | } | |
d4a72f23 TC |
374 | } |
375 | ||
376 | static inline boolean_t | |
377 | dsl_scan_is_running(const dsl_scan_t *scn) | |
378 | { | |
379 | return (scn->scn_phys.scn_state == DSS_SCANNING); | |
380 | } | |
381 | ||
382 | boolean_t | |
383 | dsl_scan_resilvering(dsl_pool_t *dp) | |
384 | { | |
385 | return (dsl_scan_is_running(dp->dp_scan) && | |
386 | dp->dp_scan->scn_phys.scn_func == POOL_SCAN_RESILVER); | |
387 | } | |
388 | ||
389 | static inline void | |
ab7615d9 | 390 | sio2bp(const scan_io_t *sio, blkptr_t *bp) |
d4a72f23 TC |
391 | { |
392 | bzero(bp, sizeof (*bp)); | |
d4a72f23 TC |
393 | bp->blk_prop = sio->sio_blk_prop; |
394 | bp->blk_phys_birth = sio->sio_phys_birth; | |
395 | bp->blk_birth = sio->sio_birth; | |
396 | bp->blk_fill = 1; /* we always only work with data pointers */ | |
397 | bp->blk_cksum = sio->sio_cksum; | |
ab7615d9 TC |
398 | |
399 | ASSERT3U(sio->sio_nr_dvas, >, 0); | |
400 | ASSERT3U(sio->sio_nr_dvas, <=, SPA_DVAS_PER_BP); | |
401 | ||
402 | bcopy(sio->sio_dva, bp->blk_dva, sio->sio_nr_dvas * sizeof (dva_t)); | |
d4a72f23 TC |
403 | } |
404 | ||
405 | static inline void | |
406 | bp2sio(const blkptr_t *bp, scan_io_t *sio, int dva_i) | |
407 | { | |
d4a72f23 TC |
408 | sio->sio_blk_prop = bp->blk_prop; |
409 | sio->sio_phys_birth = bp->blk_phys_birth; | |
410 | sio->sio_birth = bp->blk_birth; | |
411 | sio->sio_cksum = bp->blk_cksum; | |
ab7615d9 TC |
412 | sio->sio_nr_dvas = BP_GET_NDVAS(bp); |
413 | ||
414 | /* | |
415 | * Copy the DVAs to the sio. We need all copies of the block so | |
416 | * that the self healing code can use the alternate copies if the | |
417 | * first is corrupted. We want the DVA at index dva_i to be first | |
418 | * in the sio since this is the primary one that we want to issue. | |
419 | */ | |
420 | for (int i = 0, j = dva_i; i < sio->sio_nr_dvas; i++, j++) { | |
421 | sio->sio_dva[i] = bp->blk_dva[j % sio->sio_nr_dvas]; | |
422 | } | |
d4a72f23 TC |
423 | } |
424 | ||
428870ff BB |
425 | int |
426 | dsl_scan_init(dsl_pool_t *dp, uint64_t txg) | |
427 | { | |
428 | int err; | |
429 | dsl_scan_t *scn; | |
430 | spa_t *spa = dp->dp_spa; | |
431 | uint64_t f; | |
432 | ||
433 | scn = dp->dp_scan = kmem_zalloc(sizeof (dsl_scan_t), KM_SLEEP); | |
434 | scn->scn_dp = dp; | |
435 | ||
2696dfaf GW |
436 | /* |
437 | * It's possible that we're resuming a scan after a reboot so | |
438 | * make sure that the scan_async_destroying flag is initialized | |
439 | * appropriately. | |
440 | */ | |
441 | ASSERT(!scn->scn_async_destroying); | |
442 | scn->scn_async_destroying = spa_feature_is_active(dp->dp_spa, | |
fa86b5db | 443 | SPA_FEATURE_ASYNC_DESTROY); |
2696dfaf | 444 | |
f90a30ad BB |
445 | /* |
446 | * Calculate the max number of in-flight bytes for pool-wide | |
447 | * scanning operations (minimum 1MB). Limits for the issuing | |
448 | * phase are done per top-level vdev and are handled separately. | |
449 | */ | |
450 | scn->scn_maxinflight_bytes = MAX(zfs_scan_vdev_limit * | |
451 | dsl_scan_count_leaves(spa->spa_root_vdev), 1ULL << 20); | |
452 | ||
d4a72f23 TC |
453 | avl_create(&scn->scn_queue, scan_ds_queue_compare, sizeof (scan_ds_t), |
454 | offsetof(scan_ds_t, sds_node)); | |
455 | avl_create(&scn->scn_prefetch_queue, scan_prefetch_queue_compare, | |
456 | sizeof (scan_prefetch_issue_ctx_t), | |
457 | offsetof(scan_prefetch_issue_ctx_t, spic_avl_node)); | |
458 | ||
428870ff BB |
459 | err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, |
460 | "scrub_func", sizeof (uint64_t), 1, &f); | |
461 | if (err == 0) { | |
462 | /* | |
463 | * There was an old-style scrub in progress. Restart a | |
464 | * new-style scrub from the beginning. | |
465 | */ | |
466 | scn->scn_restart_txg = txg; | |
467 | zfs_dbgmsg("old-style scrub was in progress; " | |
468 | "restarting new-style scrub in txg %llu", | |
d4a72f23 | 469 | (longlong_t)scn->scn_restart_txg); |
428870ff BB |
470 | |
471 | /* | |
472 | * Load the queue obj from the old location so that it | |
473 | * can be freed by dsl_scan_done(). | |
474 | */ | |
475 | (void) zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, | |
476 | "scrub_queue", sizeof (uint64_t), 1, | |
477 | &scn->scn_phys.scn_queue_obj); | |
478 | } else { | |
479 | err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, | |
480 | DMU_POOL_SCAN, sizeof (uint64_t), SCAN_PHYS_NUMINTS, | |
481 | &scn->scn_phys); | |
4f2dcb3e RY |
482 | /* |
483 | * Detect if the pool contains the signature of #2094. If it | |
484 | * does properly update the scn->scn_phys structure and notify | |
485 | * the administrator by setting an errata for the pool. | |
486 | */ | |
487 | if (err == EOVERFLOW) { | |
488 | uint64_t zaptmp[SCAN_PHYS_NUMINTS + 1]; | |
489 | VERIFY3S(SCAN_PHYS_NUMINTS, ==, 24); | |
490 | VERIFY3S(offsetof(dsl_scan_phys_t, scn_flags), ==, | |
491 | (23 * sizeof (uint64_t))); | |
492 | ||
493 | err = zap_lookup(dp->dp_meta_objset, | |
494 | DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_SCAN, | |
495 | sizeof (uint64_t), SCAN_PHYS_NUMINTS + 1, &zaptmp); | |
496 | if (err == 0) { | |
497 | uint64_t overflow = zaptmp[SCAN_PHYS_NUMINTS]; | |
498 | ||
499 | if (overflow & ~DSL_SCAN_FLAGS_MASK || | |
500 | scn->scn_async_destroying) { | |
501 | spa->spa_errata = | |
502 | ZPOOL_ERRATA_ZOL_2094_ASYNC_DESTROY; | |
d4a72f23 | 503 | return (EOVERFLOW); |
4f2dcb3e RY |
504 | } |
505 | ||
506 | bcopy(zaptmp, &scn->scn_phys, | |
507 | SCAN_PHYS_NUMINTS * sizeof (uint64_t)); | |
508 | scn->scn_phys.scn_flags = overflow; | |
509 | ||
510 | /* Required scrub already in progress. */ | |
511 | if (scn->scn_phys.scn_state == DSS_FINISHED || | |
512 | scn->scn_phys.scn_state == DSS_CANCELED) | |
513 | spa->spa_errata = | |
514 | ZPOOL_ERRATA_ZOL_2094_SCRUB; | |
515 | } | |
516 | } | |
517 | ||
428870ff BB |
518 | if (err == ENOENT) |
519 | return (0); | |
520 | else if (err) | |
521 | return (err); | |
522 | ||
d4a72f23 TC |
523 | /* |
524 | * We might be restarting after a reboot, so jump the issued | |
525 | * counter to how far we've scanned. We know we're consistent | |
526 | * up to here. | |
527 | */ | |
528 | scn->scn_issued_before_pass = scn->scn_phys.scn_examined; | |
529 | ||
530 | if (dsl_scan_is_running(scn) && | |
428870ff BB |
531 | spa_prev_software_version(dp->dp_spa) < SPA_VERSION_SCAN) { |
532 | /* | |
533 | * A new-type scrub was in progress on an old | |
534 | * pool, and the pool was accessed by old | |
535 | * software. Restart from the beginning, since | |
536 | * the old software may have changed the pool in | |
537 | * the meantime. | |
538 | */ | |
539 | scn->scn_restart_txg = txg; | |
540 | zfs_dbgmsg("new-style scrub was modified " | |
541 | "by old software; restarting in txg %llu", | |
d4a72f23 TC |
542 | (longlong_t)scn->scn_restart_txg); |
543 | } | |
544 | } | |
545 | ||
8cb119e3 TC |
546 | bcopy(&scn->scn_phys, &scn->scn_phys_cached, sizeof (scn->scn_phys)); |
547 | ||
d4a72f23 TC |
548 | /* reload the queue into the in-core state */ |
549 | if (scn->scn_phys.scn_queue_obj != 0) { | |
550 | zap_cursor_t zc; | |
551 | zap_attribute_t za; | |
552 | ||
553 | for (zap_cursor_init(&zc, dp->dp_meta_objset, | |
554 | scn->scn_phys.scn_queue_obj); | |
555 | zap_cursor_retrieve(&zc, &za) == 0; | |
556 | (void) zap_cursor_advance(&zc)) { | |
557 | scan_ds_queue_insert(scn, | |
558 | zfs_strtonum(za.za_name, NULL), | |
559 | za.za_first_integer); | |
428870ff | 560 | } |
d4a72f23 | 561 | zap_cursor_fini(&zc); |
428870ff BB |
562 | } |
563 | ||
564 | spa_scan_stat_init(spa); | |
565 | return (0); | |
566 | } | |
567 | ||
568 | void | |
569 | dsl_scan_fini(dsl_pool_t *dp) | |
570 | { | |
d4a72f23 TC |
571 | if (dp->dp_scan != NULL) { |
572 | dsl_scan_t *scn = dp->dp_scan; | |
573 | ||
574 | if (scn->scn_taskq != NULL) | |
575 | taskq_destroy(scn->scn_taskq); | |
d6496040 | 576 | |
d4a72f23 TC |
577 | scan_ds_queue_clear(scn); |
578 | avl_destroy(&scn->scn_queue); | |
d6496040 | 579 | scan_ds_prefetch_queue_clear(scn); |
d4a72f23 TC |
580 | avl_destroy(&scn->scn_prefetch_queue); |
581 | ||
428870ff BB |
582 | kmem_free(dp->dp_scan, sizeof (dsl_scan_t)); |
583 | dp->dp_scan = NULL; | |
584 | } | |
585 | } | |
586 | ||
d4a72f23 TC |
587 | static boolean_t |
588 | dsl_scan_restarting(dsl_scan_t *scn, dmu_tx_t *tx) | |
589 | { | |
590 | return (scn->scn_restart_txg != 0 && | |
591 | scn->scn_restart_txg <= tx->tx_txg); | |
592 | } | |
593 | ||
594 | boolean_t | |
595 | dsl_scan_scrubbing(const dsl_pool_t *dp) | |
596 | { | |
597 | dsl_scan_phys_t *scn_phys = &dp->dp_scan->scn_phys; | |
598 | ||
599 | return (scn_phys->scn_state == DSS_SCANNING && | |
600 | scn_phys->scn_func == POOL_SCAN_SCRUB); | |
601 | } | |
602 | ||
603 | boolean_t | |
604 | dsl_scan_is_paused_scrub(const dsl_scan_t *scn) | |
605 | { | |
606 | return (dsl_scan_scrubbing(scn->scn_dp) && | |
607 | scn->scn_phys.scn_flags & DSF_SCRUB_PAUSED); | |
608 | } | |
609 | ||
610 | /* | |
611 | * Writes out a persistent dsl_scan_phys_t record to the pool directory. | |
612 | * Because we can be running in the block sorting algorithm, we do not always | |
613 | * want to write out the record, only when it is "safe" to do so. This safety | |
614 | * condition is achieved by making sure that the sorting queues are empty | |
615 | * (scn_bytes_pending == 0). When this condition is not true, the sync'd state | |
616 | * is inconsistent with how much actual scanning progress has been made. The | |
617 | * kind of sync to be performed is specified by the sync_type argument. If the | |
618 | * sync is optional, we only sync if the queues are empty. If the sync is | |
619 | * mandatory, we do a hard ASSERT to make sure that the queues are empty. The | |
620 | * third possible state is a "cached" sync. This is done in response to: | |
621 | * 1) The dataset that was in the last sync'd dsl_scan_phys_t having been | |
622 | * destroyed, so we wouldn't be able to restart scanning from it. | |
623 | * 2) The snapshot that was in the last sync'd dsl_scan_phys_t having been | |
624 | * superseded by a newer snapshot. | |
625 | * 3) The dataset that was in the last sync'd dsl_scan_phys_t having been | |
626 | * swapped with its clone. | |
627 | * In all cases, a cached sync simply rewrites the last record we've written, | |
628 | * just slightly modified. For the modifications that are performed to the | |
629 | * last written dsl_scan_phys_t, see dsl_scan_ds_destroyed, | |
630 | * dsl_scan_ds_snapshotted and dsl_scan_ds_clone_swapped. | |
631 | */ | |
632 | static void | |
633 | dsl_scan_sync_state(dsl_scan_t *scn, dmu_tx_t *tx, state_sync_type_t sync_type) | |
634 | { | |
635 | int i; | |
636 | spa_t *spa = scn->scn_dp->dp_spa; | |
637 | ||
638 | ASSERT(sync_type != SYNC_MANDATORY || scn->scn_bytes_pending == 0); | |
639 | if (scn->scn_bytes_pending == 0) { | |
640 | for (i = 0; i < spa->spa_root_vdev->vdev_children; i++) { | |
641 | vdev_t *vd = spa->spa_root_vdev->vdev_child[i]; | |
642 | dsl_scan_io_queue_t *q = vd->vdev_scan_io_queue; | |
643 | ||
644 | if (q == NULL) | |
645 | continue; | |
646 | ||
647 | mutex_enter(&vd->vdev_scan_io_queue_lock); | |
648 | ASSERT3P(avl_first(&q->q_sios_by_addr), ==, NULL); | |
649 | ASSERT3P(avl_first(&q->q_exts_by_size), ==, NULL); | |
650 | ASSERT3P(range_tree_first(q->q_exts_by_addr), ==, NULL); | |
651 | mutex_exit(&vd->vdev_scan_io_queue_lock); | |
652 | } | |
653 | ||
654 | if (scn->scn_phys.scn_queue_obj != 0) | |
655 | scan_ds_queue_sync(scn, tx); | |
656 | VERIFY0(zap_update(scn->scn_dp->dp_meta_objset, | |
657 | DMU_POOL_DIRECTORY_OBJECT, | |
658 | DMU_POOL_SCAN, sizeof (uint64_t), SCAN_PHYS_NUMINTS, | |
659 | &scn->scn_phys, tx)); | |
660 | bcopy(&scn->scn_phys, &scn->scn_phys_cached, | |
661 | sizeof (scn->scn_phys)); | |
662 | ||
663 | if (scn->scn_checkpointing) | |
664 | zfs_dbgmsg("finish scan checkpoint"); | |
665 | ||
666 | scn->scn_checkpointing = B_FALSE; | |
667 | scn->scn_last_checkpoint = ddi_get_lbolt(); | |
668 | } else if (sync_type == SYNC_CACHED) { | |
669 | VERIFY0(zap_update(scn->scn_dp->dp_meta_objset, | |
670 | DMU_POOL_DIRECTORY_OBJECT, | |
671 | DMU_POOL_SCAN, sizeof (uint64_t), SCAN_PHYS_NUMINTS, | |
672 | &scn->scn_phys_cached, tx)); | |
673 | } | |
674 | } | |
675 | ||
428870ff BB |
676 | /* ARGSUSED */ |
677 | static int | |
13fe0198 | 678 | dsl_scan_setup_check(void *arg, dmu_tx_t *tx) |
428870ff | 679 | { |
13fe0198 | 680 | dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan; |
428870ff | 681 | |
d4a72f23 | 682 | if (dsl_scan_is_running(scn)) |
2e528b49 | 683 | return (SET_ERROR(EBUSY)); |
428870ff BB |
684 | |
685 | return (0); | |
686 | } | |
687 | ||
428870ff | 688 | static void |
13fe0198 | 689 | dsl_scan_setup_sync(void *arg, dmu_tx_t *tx) |
428870ff | 690 | { |
13fe0198 MA |
691 | dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan; |
692 | pool_scan_func_t *funcp = arg; | |
428870ff BB |
693 | dmu_object_type_t ot = 0; |
694 | dsl_pool_t *dp = scn->scn_dp; | |
695 | spa_t *spa = dp->dp_spa; | |
696 | ||
d4a72f23 | 697 | ASSERT(!dsl_scan_is_running(scn)); |
428870ff BB |
698 | ASSERT(*funcp > POOL_SCAN_NONE && *funcp < POOL_SCAN_FUNCS); |
699 | bzero(&scn->scn_phys, sizeof (scn->scn_phys)); | |
700 | scn->scn_phys.scn_func = *funcp; | |
701 | scn->scn_phys.scn_state = DSS_SCANNING; | |
702 | scn->scn_phys.scn_min_txg = 0; | |
703 | scn->scn_phys.scn_max_txg = tx->tx_txg; | |
704 | scn->scn_phys.scn_ddt_class_max = DDT_CLASSES - 1; /* the entire DDT */ | |
705 | scn->scn_phys.scn_start_time = gethrestime_sec(); | |
706 | scn->scn_phys.scn_errors = 0; | |
707 | scn->scn_phys.scn_to_examine = spa->spa_root_vdev->vdev_stat.vs_alloc; | |
d4a72f23 | 708 | scn->scn_issued_before_pass = 0; |
428870ff | 709 | scn->scn_restart_txg = 0; |
5d1f7fb6 | 710 | scn->scn_done_txg = 0; |
d4a72f23 TC |
711 | scn->scn_last_checkpoint = 0; |
712 | scn->scn_checkpointing = B_FALSE; | |
428870ff BB |
713 | spa_scan_stat_init(spa); |
714 | ||
715 | if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) { | |
716 | scn->scn_phys.scn_ddt_class_max = zfs_scrub_ddt_class_max; | |
717 | ||
718 | /* rewrite all disk labels */ | |
719 | vdev_config_dirty(spa->spa_root_vdev); | |
720 | ||
721 | if (vdev_resilver_needed(spa->spa_root_vdev, | |
722 | &scn->scn_phys.scn_min_txg, &scn->scn_phys.scn_max_txg)) { | |
12fa0466 DE |
723 | spa_event_notify(spa, NULL, NULL, |
724 | ESC_ZFS_RESILVER_START); | |
428870ff | 725 | } else { |
12fa0466 | 726 | spa_event_notify(spa, NULL, NULL, ESC_ZFS_SCRUB_START); |
428870ff BB |
727 | } |
728 | ||
729 | spa->spa_scrub_started = B_TRUE; | |
730 | /* | |
731 | * If this is an incremental scrub, limit the DDT scrub phase | |
732 | * to just the auto-ditto class (for correctness); the rest | |
733 | * of the scrub should go faster using top-down pruning. | |
734 | */ | |
735 | if (scn->scn_phys.scn_min_txg > TXG_INITIAL) | |
736 | scn->scn_phys.scn_ddt_class_max = DDT_CLASS_DITTO; | |
737 | ||
738 | } | |
739 | ||
740 | /* back to the generic stuff */ | |
741 | ||
742 | if (dp->dp_blkstats == NULL) { | |
79c76d5b BB |
743 | dp->dp_blkstats = |
744 | vmem_alloc(sizeof (zfs_all_blkstats_t), KM_SLEEP); | |
d4a72f23 TC |
745 | mutex_init(&dp->dp_blkstats->zab_lock, NULL, |
746 | MUTEX_DEFAULT, NULL); | |
428870ff | 747 | } |
d4a72f23 | 748 | bzero(&dp->dp_blkstats->zab_type, sizeof (dp->dp_blkstats->zab_type)); |
428870ff BB |
749 | |
750 | if (spa_version(spa) < SPA_VERSION_DSL_SCRUB) | |
751 | ot = DMU_OT_ZAP_OTHER; | |
752 | ||
753 | scn->scn_phys.scn_queue_obj = zap_create(dp->dp_meta_objset, | |
754 | ot ? ot : DMU_OT_SCAN_QUEUE, DMU_OT_NONE, 0, tx); | |
755 | ||
d4a72f23 TC |
756 | bcopy(&scn->scn_phys, &scn->scn_phys_cached, sizeof (scn->scn_phys)); |
757 | ||
758 | dsl_scan_sync_state(scn, tx, SYNC_MANDATORY); | |
428870ff | 759 | |
6f1ffb06 | 760 | spa_history_log_internal(spa, "scan setup", tx, |
428870ff | 761 | "func=%u mintxg=%llu maxtxg=%llu", |
74756182 MM |
762 | *funcp, (u_longlong_t)scn->scn_phys.scn_min_txg, |
763 | (u_longlong_t)scn->scn_phys.scn_max_txg); | |
428870ff BB |
764 | } |
765 | ||
d4a72f23 TC |
766 | /* |
767 | * Called by the ZFS_IOC_POOL_SCAN ioctl to start a scrub or resilver. | |
768 | * Can also be called to resume a paused scrub. | |
769 | */ | |
770 | int | |
771 | dsl_scan(dsl_pool_t *dp, pool_scan_func_t func) | |
772 | { | |
773 | spa_t *spa = dp->dp_spa; | |
774 | dsl_scan_t *scn = dp->dp_scan; | |
775 | ||
776 | /* | |
777 | * Purge all vdev caches and probe all devices. We do this here | |
778 | * rather than in sync context because this requires a writer lock | |
779 | * on the spa_config lock, which we can't do from sync context. The | |
780 | * spa_scrub_reopen flag indicates that vdev_open() should not | |
781 | * attempt to start another scrub. | |
782 | */ | |
783 | spa_vdev_state_enter(spa, SCL_NONE); | |
784 | spa->spa_scrub_reopen = B_TRUE; | |
785 | vdev_reopen(spa->spa_root_vdev); | |
786 | spa->spa_scrub_reopen = B_FALSE; | |
787 | (void) spa_vdev_state_exit(spa, NULL, 0); | |
788 | ||
80a91e74 TC |
789 | if (func == POOL_SCAN_RESILVER) { |
790 | dsl_resilver_restart(spa->spa_dsl_pool, 0); | |
791 | return (0); | |
792 | } | |
793 | ||
d4a72f23 TC |
794 | if (func == POOL_SCAN_SCRUB && dsl_scan_is_paused_scrub(scn)) { |
795 | /* got scrub start cmd, resume paused scrub */ | |
796 | int err = dsl_scrub_set_pause_resume(scn->scn_dp, | |
797 | POOL_SCRUB_NORMAL); | |
43cb30b3 SEF |
798 | if (err == 0) { |
799 | spa_event_notify(spa, NULL, NULL, ESC_ZFS_SCRUB_RESUME); | |
d4a72f23 | 800 | return (ECANCELED); |
43cb30b3 | 801 | } |
d4a72f23 TC |
802 | |
803 | return (SET_ERROR(err)); | |
804 | } | |
805 | ||
806 | return (dsl_sync_task(spa_name(spa), dsl_scan_setup_check, | |
d2734cce | 807 | dsl_scan_setup_sync, &func, 0, ZFS_SPACE_CHECK_EXTRA_RESERVED)); |
d4a72f23 TC |
808 | } |
809 | ||
80a91e74 TC |
810 | /* |
811 | * Sets the resilver defer flag to B_FALSE on all leaf devs under vd. Returns | |
812 | * B_TRUE if we have devices that need to be resilvered and are available to | |
813 | * accept resilver I/Os. | |
814 | */ | |
815 | static boolean_t | |
816 | dsl_scan_clear_deferred(vdev_t *vd, dmu_tx_t *tx) | |
817 | { | |
818 | boolean_t resilver_needed = B_FALSE; | |
819 | spa_t *spa = vd->vdev_spa; | |
820 | ||
821 | for (int c = 0; c < vd->vdev_children; c++) { | |
822 | resilver_needed |= | |
823 | dsl_scan_clear_deferred(vd->vdev_child[c], tx); | |
824 | } | |
825 | ||
826 | if (vd == spa->spa_root_vdev && | |
827 | spa_feature_is_active(spa, SPA_FEATURE_RESILVER_DEFER)) { | |
828 | spa_feature_decr(spa, SPA_FEATURE_RESILVER_DEFER, tx); | |
829 | vdev_config_dirty(vd); | |
830 | spa->spa_resilver_deferred = B_FALSE; | |
831 | return (resilver_needed); | |
832 | } | |
833 | ||
834 | if (!vdev_is_concrete(vd) || vd->vdev_aux || | |
835 | !vd->vdev_ops->vdev_op_leaf) | |
836 | return (resilver_needed); | |
837 | ||
838 | if (vd->vdev_resilver_deferred) | |
839 | vd->vdev_resilver_deferred = B_FALSE; | |
840 | ||
841 | return (!vdev_is_dead(vd) && !vd->vdev_offline && | |
842 | vdev_resilver_needed(vd, NULL, NULL)); | |
843 | } | |
844 | ||
428870ff BB |
845 | /* ARGSUSED */ |
846 | static void | |
847 | dsl_scan_done(dsl_scan_t *scn, boolean_t complete, dmu_tx_t *tx) | |
848 | { | |
849 | static const char *old_names[] = { | |
850 | "scrub_bookmark", | |
851 | "scrub_ddt_bookmark", | |
852 | "scrub_ddt_class_max", | |
853 | "scrub_queue", | |
854 | "scrub_min_txg", | |
855 | "scrub_max_txg", | |
856 | "scrub_func", | |
857 | "scrub_errors", | |
858 | NULL | |
859 | }; | |
860 | ||
861 | dsl_pool_t *dp = scn->scn_dp; | |
862 | spa_t *spa = dp->dp_spa; | |
863 | int i; | |
864 | ||
865 | /* Remove any remnants of an old-style scrub. */ | |
866 | for (i = 0; old_names[i]; i++) { | |
867 | (void) zap_remove(dp->dp_meta_objset, | |
868 | DMU_POOL_DIRECTORY_OBJECT, old_names[i], tx); | |
869 | } | |
870 | ||
871 | if (scn->scn_phys.scn_queue_obj != 0) { | |
d4a72f23 | 872 | VERIFY0(dmu_object_free(dp->dp_meta_objset, |
428870ff BB |
873 | scn->scn_phys.scn_queue_obj, tx)); |
874 | scn->scn_phys.scn_queue_obj = 0; | |
875 | } | |
d4a72f23 | 876 | scan_ds_queue_clear(scn); |
d6496040 | 877 | scan_ds_prefetch_queue_clear(scn); |
428870ff | 878 | |
0ea05c64 AP |
879 | scn->scn_phys.scn_flags &= ~DSF_SCRUB_PAUSED; |
880 | ||
428870ff BB |
881 | /* |
882 | * If we were "restarted" from a stopped state, don't bother | |
883 | * with anything else. | |
884 | */ | |
d4a72f23 TC |
885 | if (!dsl_scan_is_running(scn)) { |
886 | ASSERT(!scn->scn_is_sorted); | |
428870ff | 887 | return; |
d4a72f23 | 888 | } |
428870ff | 889 | |
d4a72f23 TC |
890 | if (scn->scn_is_sorted) { |
891 | scan_io_queues_destroy(scn); | |
892 | scn->scn_is_sorted = B_FALSE; | |
893 | ||
894 | if (scn->scn_taskq != NULL) { | |
895 | taskq_destroy(scn->scn_taskq); | |
896 | scn->scn_taskq = NULL; | |
897 | } | |
898 | } | |
899 | ||
900 | scn->scn_phys.scn_state = complete ? DSS_FINISHED : DSS_CANCELED; | |
428870ff | 901 | |
784d15c1 NR |
902 | if (dsl_scan_restarting(scn, tx)) |
903 | spa_history_log_internal(spa, "scan aborted, restarting", tx, | |
74756182 | 904 | "errors=%llu", (u_longlong_t)spa_get_errlog_size(spa)); |
784d15c1 NR |
905 | else if (!complete) |
906 | spa_history_log_internal(spa, "scan cancelled", tx, | |
74756182 | 907 | "errors=%llu", (u_longlong_t)spa_get_errlog_size(spa)); |
784d15c1 NR |
908 | else |
909 | spa_history_log_internal(spa, "scan done", tx, | |
74756182 | 910 | "errors=%llu", (u_longlong_t)spa_get_errlog_size(spa)); |
428870ff BB |
911 | |
912 | if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) { | |
428870ff BB |
913 | spa->spa_scrub_started = B_FALSE; |
914 | spa->spa_scrub_active = B_FALSE; | |
915 | ||
916 | /* | |
917 | * If the scrub/resilver completed, update all DTLs to | |
918 | * reflect this. Whether it succeeded or not, vacate | |
919 | * all temporary scrub DTLs. | |
d2734cce SD |
920 | * |
921 | * As the scrub does not currently support traversing | |
922 | * data that have been freed but are part of a checkpoint, | |
923 | * we don't mark the scrub as done in the DTLs as faults | |
924 | * may still exist in those vdevs. | |
428870ff | 925 | */ |
d2734cce SD |
926 | if (complete && |
927 | !spa_feature_is_active(spa, SPA_FEATURE_POOL_CHECKPOINT)) { | |
928 | vdev_dtl_reassess(spa->spa_root_vdev, tx->tx_txg, | |
929 | scn->scn_phys.scn_max_txg, B_TRUE); | |
930 | ||
12fa0466 DE |
931 | spa_event_notify(spa, NULL, NULL, |
932 | scn->scn_phys.scn_min_txg ? | |
fb390aaf | 933 | ESC_ZFS_RESILVER_FINISH : ESC_ZFS_SCRUB_FINISH); |
d2734cce SD |
934 | } else { |
935 | vdev_dtl_reassess(spa->spa_root_vdev, tx->tx_txg, | |
936 | 0, B_TRUE); | |
428870ff BB |
937 | } |
938 | spa_errlog_rotate(spa); | |
939 | ||
940 | /* | |
941 | * We may have finished replacing a device. | |
942 | * Let the async thread assess this and handle the detach. | |
943 | */ | |
944 | spa_async_request(spa, SPA_ASYNC_RESILVER_DONE); | |
80a91e74 TC |
945 | |
946 | /* | |
947 | * Clear any deferred_resilver flags in the config. | |
948 | * If there are drives that need resilvering, kick | |
949 | * off an asynchronous request to start resilver. | |
950 | * dsl_scan_clear_deferred() may update the config | |
951 | * before the resilver can restart. In the event of | |
952 | * a crash during this period, the spa loading code | |
953 | * will find the drives that need to be resilvered | |
954 | * when the machine reboots and start the resilver then. | |
955 | */ | |
956 | boolean_t resilver_needed = | |
957 | dsl_scan_clear_deferred(spa->spa_root_vdev, tx); | |
958 | if (resilver_needed) { | |
959 | spa_history_log_internal(spa, | |
960 | "starting deferred resilver", tx, | |
74756182 MM |
961 | "errors=%llu", |
962 | (u_longlong_t)spa_get_errlog_size(spa)); | |
80a91e74 TC |
963 | spa_async_request(spa, SPA_ASYNC_RESILVER); |
964 | } | |
428870ff BB |
965 | } |
966 | ||
967 | scn->scn_phys.scn_end_time = gethrestime_sec(); | |
4f2dcb3e RY |
968 | |
969 | if (spa->spa_errata == ZPOOL_ERRATA_ZOL_2094_SCRUB) | |
970 | spa->spa_errata = 0; | |
d4a72f23 TC |
971 | |
972 | ASSERT(!dsl_scan_is_running(scn)); | |
428870ff BB |
973 | } |
974 | ||
975 | /* ARGSUSED */ | |
976 | static int | |
13fe0198 | 977 | dsl_scan_cancel_check(void *arg, dmu_tx_t *tx) |
428870ff | 978 | { |
13fe0198 | 979 | dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan; |
428870ff | 980 | |
d4a72f23 | 981 | if (!dsl_scan_is_running(scn)) |
2e528b49 | 982 | return (SET_ERROR(ENOENT)); |
428870ff BB |
983 | return (0); |
984 | } | |
985 | ||
986 | /* ARGSUSED */ | |
987 | static void | |
13fe0198 | 988 | dsl_scan_cancel_sync(void *arg, dmu_tx_t *tx) |
428870ff | 989 | { |
13fe0198 | 990 | dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan; |
428870ff BB |
991 | |
992 | dsl_scan_done(scn, B_FALSE, tx); | |
d4a72f23 | 993 | dsl_scan_sync_state(scn, tx, SYNC_MANDATORY); |
43cb30b3 | 994 | spa_event_notify(scn->scn_dp->dp_spa, NULL, NULL, ESC_ZFS_SCRUB_ABORT); |
428870ff BB |
995 | } |
996 | ||
997 | int | |
998 | dsl_scan_cancel(dsl_pool_t *dp) | |
999 | { | |
13fe0198 | 1000 | return (dsl_sync_task(spa_name(dp->dp_spa), dsl_scan_cancel_check, |
3d45fdd6 | 1001 | dsl_scan_cancel_sync, NULL, 3, ZFS_SPACE_CHECK_RESERVED)); |
428870ff BB |
1002 | } |
1003 | ||
0ea05c64 AP |
1004 | static int |
1005 | dsl_scrub_pause_resume_check(void *arg, dmu_tx_t *tx) | |
1006 | { | |
1007 | pool_scrub_cmd_t *cmd = arg; | |
1008 | dsl_pool_t *dp = dmu_tx_pool(tx); | |
1009 | dsl_scan_t *scn = dp->dp_scan; | |
1010 | ||
1011 | if (*cmd == POOL_SCRUB_PAUSE) { | |
1012 | /* can't pause a scrub when there is no in-progress scrub */ | |
1013 | if (!dsl_scan_scrubbing(dp)) | |
1014 | return (SET_ERROR(ENOENT)); | |
1015 | ||
1016 | /* can't pause a paused scrub */ | |
1017 | if (dsl_scan_is_paused_scrub(scn)) | |
1018 | return (SET_ERROR(EBUSY)); | |
1019 | } else if (*cmd != POOL_SCRUB_NORMAL) { | |
1020 | return (SET_ERROR(ENOTSUP)); | |
1021 | } | |
1022 | ||
1023 | return (0); | |
1024 | } | |
1025 | ||
1026 | static void | |
1027 | dsl_scrub_pause_resume_sync(void *arg, dmu_tx_t *tx) | |
1028 | { | |
1029 | pool_scrub_cmd_t *cmd = arg; | |
1030 | dsl_pool_t *dp = dmu_tx_pool(tx); | |
1031 | spa_t *spa = dp->dp_spa; | |
1032 | dsl_scan_t *scn = dp->dp_scan; | |
1033 | ||
0ea05c64 AP |
1034 | if (*cmd == POOL_SCRUB_PAUSE) { |
1035 | /* can't pause a scrub when there is no in-progress scrub */ | |
1036 | spa->spa_scan_pass_scrub_pause = gethrestime_sec(); | |
1037 | scn->scn_phys.scn_flags |= DSF_SCRUB_PAUSED; | |
8cb119e3 | 1038 | scn->scn_phys_cached.scn_flags |= DSF_SCRUB_PAUSED; |
d4a72f23 | 1039 | dsl_scan_sync_state(scn, tx, SYNC_CACHED); |
43cb30b3 | 1040 | spa_event_notify(spa, NULL, NULL, ESC_ZFS_SCRUB_PAUSED); |
0ea05c64 AP |
1041 | } else { |
1042 | ASSERT3U(*cmd, ==, POOL_SCRUB_NORMAL); | |
1043 | if (dsl_scan_is_paused_scrub(scn)) { | |
1044 | /* | |
1045 | * We need to keep track of how much time we spend | |
1046 | * paused per pass so that we can adjust the scrub rate | |
1047 | * shown in the output of 'zpool status' | |
1048 | */ | |
1049 | spa->spa_scan_pass_scrub_spent_paused += | |
1050 | gethrestime_sec() - spa->spa_scan_pass_scrub_pause; | |
1051 | spa->spa_scan_pass_scrub_pause = 0; | |
1052 | scn->scn_phys.scn_flags &= ~DSF_SCRUB_PAUSED; | |
8cb119e3 | 1053 | scn->scn_phys_cached.scn_flags &= ~DSF_SCRUB_PAUSED; |
d4a72f23 | 1054 | dsl_scan_sync_state(scn, tx, SYNC_CACHED); |
0ea05c64 AP |
1055 | } |
1056 | } | |
1057 | } | |
1058 | ||
1059 | /* | |
1060 | * Set scrub pause/resume state if it makes sense to do so | |
1061 | */ | |
1062 | int | |
1063 | dsl_scrub_set_pause_resume(const dsl_pool_t *dp, pool_scrub_cmd_t cmd) | |
1064 | { | |
1065 | return (dsl_sync_task(spa_name(dp->dp_spa), | |
1066 | dsl_scrub_pause_resume_check, dsl_scrub_pause_resume_sync, &cmd, 3, | |
1067 | ZFS_SPACE_CHECK_RESERVED)); | |
1068 | } | |
1069 | ||
0ea05c64 | 1070 | |
d4a72f23 TC |
1071 | /* start a new scan, or restart an existing one. */ |
1072 | void | |
1073 | dsl_resilver_restart(dsl_pool_t *dp, uint64_t txg) | |
1074 | { | |
1075 | if (txg == 0) { | |
1076 | dmu_tx_t *tx; | |
1077 | tx = dmu_tx_create_dd(dp->dp_mos_dir); | |
1078 | VERIFY(0 == dmu_tx_assign(tx, TXG_WAIT)); | |
0ea05c64 | 1079 | |
d4a72f23 TC |
1080 | txg = dmu_tx_get_txg(tx); |
1081 | dp->dp_scan->scn_restart_txg = txg; | |
1082 | dmu_tx_commit(tx); | |
1083 | } else { | |
1084 | dp->dp_scan->scn_restart_txg = txg; | |
1085 | } | |
1086 | zfs_dbgmsg("restarting resilver txg=%llu", (longlong_t)txg); | |
0ea05c64 AP |
1087 | } |
1088 | ||
428870ff BB |
1089 | void |
1090 | dsl_free(dsl_pool_t *dp, uint64_t txg, const blkptr_t *bp) | |
1091 | { | |
1092 | zio_free(dp->dp_spa, txg, bp); | |
1093 | } | |
1094 | ||
1095 | void | |
1096 | dsl_free_sync(zio_t *pio, dsl_pool_t *dp, uint64_t txg, const blkptr_t *bpp) | |
1097 | { | |
1098 | ASSERT(dsl_pool_sync_context(dp)); | |
1099 | zio_nowait(zio_free_sync(pio, dp->dp_spa, txg, bpp, pio->io_flags)); | |
1100 | } | |
1101 | ||
d4a72f23 TC |
1102 | static int |
1103 | scan_ds_queue_compare(const void *a, const void *b) | |
428870ff | 1104 | { |
d4a72f23 TC |
1105 | const scan_ds_t *sds_a = a, *sds_b = b; |
1106 | ||
1107 | if (sds_a->sds_dsobj < sds_b->sds_dsobj) | |
1108 | return (-1); | |
1109 | if (sds_a->sds_dsobj == sds_b->sds_dsobj) | |
1110 | return (0); | |
1111 | return (1); | |
428870ff BB |
1112 | } |
1113 | ||
1114 | static void | |
d4a72f23 TC |
1115 | scan_ds_queue_clear(dsl_scan_t *scn) |
1116 | { | |
1117 | void *cookie = NULL; | |
1118 | scan_ds_t *sds; | |
1119 | while ((sds = avl_destroy_nodes(&scn->scn_queue, &cookie)) != NULL) { | |
1120 | kmem_free(sds, sizeof (*sds)); | |
1121 | } | |
1122 | } | |
1123 | ||
1124 | static boolean_t | |
1125 | scan_ds_queue_contains(dsl_scan_t *scn, uint64_t dsobj, uint64_t *txg) | |
428870ff | 1126 | { |
d4a72f23 TC |
1127 | scan_ds_t srch, *sds; |
1128 | ||
1129 | srch.sds_dsobj = dsobj; | |
1130 | sds = avl_find(&scn->scn_queue, &srch, NULL); | |
1131 | if (sds != NULL && txg != NULL) | |
1132 | *txg = sds->sds_txg; | |
1133 | return (sds != NULL); | |
428870ff BB |
1134 | } |
1135 | ||
d4a72f23 TC |
1136 | static void |
1137 | scan_ds_queue_insert(dsl_scan_t *scn, uint64_t dsobj, uint64_t txg) | |
1138 | { | |
1139 | scan_ds_t *sds; | |
1140 | avl_index_t where; | |
1141 | ||
1142 | sds = kmem_zalloc(sizeof (*sds), KM_SLEEP); | |
1143 | sds->sds_dsobj = dsobj; | |
1144 | sds->sds_txg = txg; | |
1145 | ||
1146 | VERIFY3P(avl_find(&scn->scn_queue, sds, &where), ==, NULL); | |
1147 | avl_insert(&scn->scn_queue, sds, where); | |
1148 | } | |
1149 | ||
1150 | static void | |
1151 | scan_ds_queue_remove(dsl_scan_t *scn, uint64_t dsobj) | |
1152 | { | |
1153 | scan_ds_t srch, *sds; | |
1154 | ||
1155 | srch.sds_dsobj = dsobj; | |
1156 | ||
1157 | sds = avl_find(&scn->scn_queue, &srch, NULL); | |
1158 | VERIFY(sds != NULL); | |
1159 | avl_remove(&scn->scn_queue, sds); | |
1160 | kmem_free(sds, sizeof (*sds)); | |
1161 | } | |
1162 | ||
1163 | static void | |
1164 | scan_ds_queue_sync(dsl_scan_t *scn, dmu_tx_t *tx) | |
1165 | { | |
1166 | dsl_pool_t *dp = scn->scn_dp; | |
1167 | spa_t *spa = dp->dp_spa; | |
1168 | dmu_object_type_t ot = (spa_version(spa) >= SPA_VERSION_DSL_SCRUB) ? | |
1169 | DMU_OT_SCAN_QUEUE : DMU_OT_ZAP_OTHER; | |
1170 | ||
1171 | ASSERT0(scn->scn_bytes_pending); | |
1172 | ASSERT(scn->scn_phys.scn_queue_obj != 0); | |
1173 | ||
1174 | VERIFY0(dmu_object_free(dp->dp_meta_objset, | |
1175 | scn->scn_phys.scn_queue_obj, tx)); | |
1176 | scn->scn_phys.scn_queue_obj = zap_create(dp->dp_meta_objset, ot, | |
1177 | DMU_OT_NONE, 0, tx); | |
1178 | for (scan_ds_t *sds = avl_first(&scn->scn_queue); | |
1179 | sds != NULL; sds = AVL_NEXT(&scn->scn_queue, sds)) { | |
1180 | VERIFY0(zap_add_int_key(dp->dp_meta_objset, | |
1181 | scn->scn_phys.scn_queue_obj, sds->sds_dsobj, | |
1182 | sds->sds_txg, tx)); | |
1183 | } | |
1184 | } | |
1185 | ||
1186 | /* | |
1187 | * Computes the memory limit state that we're currently in. A sorted scan | |
1188 | * needs quite a bit of memory to hold the sorting queue, so we need to | |
1189 | * reasonably constrain the size so it doesn't impact overall system | |
1190 | * performance. We compute two limits: | |
1191 | * 1) Hard memory limit: if the amount of memory used by the sorting | |
1192 | * queues on a pool gets above this value, we stop the metadata | |
1193 | * scanning portion and start issuing the queued up and sorted | |
1194 | * I/Os to reduce memory usage. | |
1195 | * This limit is calculated as a fraction of physmem (by default 5%). | |
1196 | * We constrain the lower bound of the hard limit to an absolute | |
1197 | * minimum of zfs_scan_mem_lim_min (default: 16 MiB). We also constrain | |
1198 | * the upper bound to 5% of the total pool size - no chance we'll | |
1199 | * ever need that much memory, but just to keep the value in check. | |
1200 | * 2) Soft memory limit: once we hit the hard memory limit, we start | |
1201 | * issuing I/O to reduce queue memory usage, but we don't want to | |
1202 | * completely empty out the queues, since we might be able to find I/Os | |
1203 | * that will fill in the gaps of our non-sequential IOs at some point | |
1204 | * in the future. So we stop the issuing of I/Os once the amount of | |
1205 | * memory used drops below the soft limit (at which point we stop issuing | |
1206 | * I/O and start scanning metadata again). | |
1207 | * | |
1208 | * This limit is calculated by subtracting a fraction of the hard | |
1209 | * limit from the hard limit. By default this fraction is 5%, so | |
1210 | * the soft limit is 95% of the hard limit. We cap the size of the | |
1211 | * difference between the hard and soft limits at an absolute | |
1212 | * maximum of zfs_scan_mem_lim_soft_max (default: 128 MiB) - this is | |
1213 | * sufficient to not cause too frequent switching between the | |
1214 | * metadata scan and I/O issue (even at 2k recordsize, 128 MiB's | |
1215 | * worth of queues is about 1.2 GiB of on-pool data, so scanning | |
1216 | * that should take at least a decent fraction of a second). | |
1217 | */ | |
1218 | static boolean_t | |
1219 | dsl_scan_should_clear(dsl_scan_t *scn) | |
1220 | { | |
1221 | vdev_t *rvd = scn->scn_dp->dp_spa->spa_root_vdev; | |
1222 | uint64_t mlim_hard, mlim_soft, mused; | |
1223 | uint64_t alloc = metaslab_class_get_alloc(spa_normal_class( | |
1224 | scn->scn_dp->dp_spa)); | |
1225 | ||
1226 | mlim_hard = MAX((physmem / zfs_scan_mem_lim_fact) * PAGESIZE, | |
1227 | zfs_scan_mem_lim_min); | |
1228 | mlim_hard = MIN(mlim_hard, alloc / 20); | |
1229 | mlim_soft = mlim_hard - MIN(mlim_hard / zfs_scan_mem_lim_soft_fact, | |
1230 | zfs_scan_mem_lim_soft_max); | |
1231 | mused = 0; | |
1232 | for (uint64_t i = 0; i < rvd->vdev_children; i++) { | |
1233 | vdev_t *tvd = rvd->vdev_child[i]; | |
1234 | dsl_scan_io_queue_t *queue; | |
1235 | ||
1236 | mutex_enter(&tvd->vdev_scan_io_queue_lock); | |
1237 | queue = tvd->vdev_scan_io_queue; | |
1238 | if (queue != NULL) { | |
ab7615d9 | 1239 | /* # extents in exts_by_size = # in exts_by_addr */ |
d4a72f23 | 1240 | mused += avl_numnodes(&queue->q_exts_by_size) * |
ab7615d9 | 1241 | sizeof (range_seg_t) + queue->q_sio_memused; |
d4a72f23 TC |
1242 | } |
1243 | mutex_exit(&tvd->vdev_scan_io_queue_lock); | |
1244 | } | |
1245 | ||
1246 | dprintf("current scan memory usage: %llu bytes\n", (longlong_t)mused); | |
1247 | ||
1248 | if (mused == 0) | |
1249 | ASSERT0(scn->scn_bytes_pending); | |
1250 | ||
1251 | /* | |
1252 | * If we are above our hard limit, we need to clear out memory. | |
1253 | * If we are below our soft limit, we need to accumulate sequential IOs. | |
1254 | * Otherwise, we should keep doing whatever we are currently doing. | |
1255 | */ | |
1256 | if (mused >= mlim_hard) | |
1257 | return (B_TRUE); | |
1258 | else if (mused < mlim_soft) | |
1259 | return (B_FALSE); | |
1260 | else | |
1261 | return (scn->scn_clearing); | |
1262 | } | |
10400bfe | 1263 | |
428870ff | 1264 | static boolean_t |
0ea05c64 | 1265 | dsl_scan_check_suspend(dsl_scan_t *scn, const zbookmark_phys_t *zb) |
428870ff | 1266 | { |
428870ff BB |
1267 | /* we never skip user/group accounting objects */ |
1268 | if (zb && (int64_t)zb->zb_object < 0) | |
1269 | return (B_FALSE); | |
1270 | ||
0ea05c64 AP |
1271 | if (scn->scn_suspending) |
1272 | return (B_TRUE); /* we're already suspending */ | |
428870ff | 1273 | |
9ae529ec | 1274 | if (!ZB_IS_ZERO(&scn->scn_phys.scn_bookmark)) |
428870ff BB |
1275 | return (B_FALSE); /* we're resuming */ |
1276 | ||
5815f7ac TC |
1277 | /* We only know how to resume from level-0 and objset blocks. */ |
1278 | if (zb && (zb->zb_level != 0 && zb->zb_level != ZB_ROOT_LEVEL)) | |
428870ff BB |
1279 | return (B_FALSE); |
1280 | ||
10400bfe | 1281 | /* |
0ea05c64 | 1282 | * We suspend if: |
10400bfe MA |
1283 | * - we have scanned for at least the minimum time (default 1 sec |
1284 | * for scrub, 3 sec for resilver), and either we have sufficient | |
1285 | * dirty data that we are starting to write more quickly | |
d4a72f23 TC |
1286 | * (default 30%), someone is explicitly waiting for this txg |
1287 | * to complete, or we have used up all of the time in the txg | |
1288 | * timeout (default 5 sec). | |
10400bfe MA |
1289 | * or |
1290 | * - the spa is shutting down because this pool is being exported | |
1291 | * or the machine is rebooting. | |
d4a72f23 TC |
1292 | * or |
1293 | * - the scan queue has reached its memory use limit | |
10400bfe | 1294 | */ |
d4a72f23 TC |
1295 | uint64_t curr_time_ns = gethrtime(); |
1296 | uint64_t scan_time_ns = curr_time_ns - scn->scn_sync_start_time; | |
1297 | uint64_t sync_time_ns = curr_time_ns - | |
1298 | scn->scn_dp->dp_spa->spa_sync_starttime; | |
1c27024e | 1299 | int dirty_pct = scn->scn_dp->dp_dirty_total * 100 / zfs_dirty_data_max; |
d4a72f23 TC |
1300 | int mintime = (scn->scn_phys.scn_func == POOL_SCAN_RESILVER) ? |
1301 | zfs_resilver_min_time_ms : zfs_scrub_min_time_ms; | |
1302 | ||
1303 | if ((NSEC2MSEC(scan_time_ns) > mintime && | |
1304 | (dirty_pct >= zfs_vdev_async_write_active_min_dirty_percent || | |
1305 | txg_sync_waiting(scn->scn_dp) || | |
1306 | NSEC2SEC(sync_time_ns) >= zfs_txg_timeout)) || | |
1307 | spa_shutting_down(scn->scn_dp->dp_spa) || | |
1308 | (zfs_scan_strict_mem_lim && dsl_scan_should_clear(scn))) { | |
5815f7ac TC |
1309 | if (zb && zb->zb_level == ZB_ROOT_LEVEL) { |
1310 | dprintf("suspending at first available bookmark " | |
1311 | "%llx/%llx/%llx/%llx\n", | |
1312 | (longlong_t)zb->zb_objset, | |
1313 | (longlong_t)zb->zb_object, | |
1314 | (longlong_t)zb->zb_level, | |
1315 | (longlong_t)zb->zb_blkid); | |
1316 | SET_BOOKMARK(&scn->scn_phys.scn_bookmark, | |
1317 | zb->zb_objset, 0, 0, 0); | |
1318 | } else if (zb != NULL) { | |
0ea05c64 | 1319 | dprintf("suspending at bookmark %llx/%llx/%llx/%llx\n", |
428870ff BB |
1320 | (longlong_t)zb->zb_objset, |
1321 | (longlong_t)zb->zb_object, | |
1322 | (longlong_t)zb->zb_level, | |
1323 | (longlong_t)zb->zb_blkid); | |
1324 | scn->scn_phys.scn_bookmark = *zb; | |
d4a72f23 | 1325 | } else { |
21a4f5cc | 1326 | #ifdef ZFS_DEBUG |
d4a72f23 | 1327 | dsl_scan_phys_t *scnp = &scn->scn_phys; |
d4a72f23 TC |
1328 | dprintf("suspending at at DDT bookmark " |
1329 | "%llx/%llx/%llx/%llx\n", | |
1330 | (longlong_t)scnp->scn_ddt_bookmark.ddb_class, | |
1331 | (longlong_t)scnp->scn_ddt_bookmark.ddb_type, | |
1332 | (longlong_t)scnp->scn_ddt_bookmark.ddb_checksum, | |
1333 | (longlong_t)scnp->scn_ddt_bookmark.ddb_cursor); | |
21a4f5cc | 1334 | #endif |
428870ff | 1335 | } |
0ea05c64 | 1336 | scn->scn_suspending = B_TRUE; |
428870ff BB |
1337 | return (B_TRUE); |
1338 | } | |
1339 | return (B_FALSE); | |
1340 | } | |
1341 | ||
1342 | typedef struct zil_scan_arg { | |
1343 | dsl_pool_t *zsa_dp; | |
1344 | zil_header_t *zsa_zh; | |
1345 | } zil_scan_arg_t; | |
1346 | ||
1347 | /* ARGSUSED */ | |
1348 | static int | |
1349 | dsl_scan_zil_block(zilog_t *zilog, blkptr_t *bp, void *arg, uint64_t claim_txg) | |
1350 | { | |
1351 | zil_scan_arg_t *zsa = arg; | |
1352 | dsl_pool_t *dp = zsa->zsa_dp; | |
1353 | dsl_scan_t *scn = dp->dp_scan; | |
1354 | zil_header_t *zh = zsa->zsa_zh; | |
5dbd68a3 | 1355 | zbookmark_phys_t zb; |
428870ff | 1356 | |
30af21b0 | 1357 | ASSERT(!BP_IS_REDACTED(bp)); |
b0bc7a84 | 1358 | if (BP_IS_HOLE(bp) || bp->blk_birth <= scn->scn_phys.scn_cur_min_txg) |
428870ff BB |
1359 | return (0); |
1360 | ||
1361 | /* | |
1362 | * One block ("stubby") can be allocated a long time ago; we | |
1363 | * want to visit that one because it has been allocated | |
1364 | * (on-disk) even if it hasn't been claimed (even though for | |
1365 | * scrub there's nothing to do to it). | |
1366 | */ | |
d2734cce | 1367 | if (claim_txg == 0 && bp->blk_birth >= spa_min_claim_txg(dp->dp_spa)) |
428870ff BB |
1368 | return (0); |
1369 | ||
1370 | SET_BOOKMARK(&zb, zh->zh_log.blk_cksum.zc_word[ZIL_ZC_OBJSET], | |
1371 | ZB_ZIL_OBJECT, ZB_ZIL_LEVEL, bp->blk_cksum.zc_word[ZIL_ZC_SEQ]); | |
1372 | ||
1373 | VERIFY(0 == scan_funcs[scn->scn_phys.scn_func](dp, bp, &zb)); | |
1374 | return (0); | |
1375 | } | |
1376 | ||
1377 | /* ARGSUSED */ | |
1378 | static int | |
1379 | dsl_scan_zil_record(zilog_t *zilog, lr_t *lrc, void *arg, uint64_t claim_txg) | |
1380 | { | |
1381 | if (lrc->lrc_txtype == TX_WRITE) { | |
1382 | zil_scan_arg_t *zsa = arg; | |
1383 | dsl_pool_t *dp = zsa->zsa_dp; | |
1384 | dsl_scan_t *scn = dp->dp_scan; | |
1385 | zil_header_t *zh = zsa->zsa_zh; | |
1386 | lr_write_t *lr = (lr_write_t *)lrc; | |
1387 | blkptr_t *bp = &lr->lr_blkptr; | |
5dbd68a3 | 1388 | zbookmark_phys_t zb; |
428870ff | 1389 | |
30af21b0 | 1390 | ASSERT(!BP_IS_REDACTED(bp)); |
b0bc7a84 MG |
1391 | if (BP_IS_HOLE(bp) || |
1392 | bp->blk_birth <= scn->scn_phys.scn_cur_min_txg) | |
428870ff BB |
1393 | return (0); |
1394 | ||
1395 | /* | |
1396 | * birth can be < claim_txg if this record's txg is | |
1397 | * already txg sync'ed (but this log block contains | |
1398 | * other records that are not synced) | |
1399 | */ | |
1400 | if (claim_txg == 0 || bp->blk_birth < claim_txg) | |
1401 | return (0); | |
1402 | ||
1403 | SET_BOOKMARK(&zb, zh->zh_log.blk_cksum.zc_word[ZIL_ZC_OBJSET], | |
1404 | lr->lr_foid, ZB_ZIL_LEVEL, | |
1405 | lr->lr_offset / BP_GET_LSIZE(bp)); | |
1406 | ||
1407 | VERIFY(0 == scan_funcs[scn->scn_phys.scn_func](dp, bp, &zb)); | |
1408 | } | |
1409 | return (0); | |
1410 | } | |
1411 | ||
1412 | static void | |
1413 | dsl_scan_zil(dsl_pool_t *dp, zil_header_t *zh) | |
1414 | { | |
1415 | uint64_t claim_txg = zh->zh_claim_txg; | |
1416 | zil_scan_arg_t zsa = { dp, zh }; | |
1417 | zilog_t *zilog; | |
1418 | ||
d2734cce SD |
1419 | ASSERT(spa_writeable(dp->dp_spa)); |
1420 | ||
428870ff BB |
1421 | /* |
1422 | * We only want to visit blocks that have been claimed but not yet | |
1423 | * replayed (or, in read-only mode, blocks that *would* be claimed). | |
1424 | */ | |
d2734cce | 1425 | if (claim_txg == 0) |
428870ff BB |
1426 | return; |
1427 | ||
1428 | zilog = zil_alloc(dp->dp_meta_objset, zh); | |
1429 | ||
1430 | (void) zil_parse(zilog, dsl_scan_zil_block, dsl_scan_zil_record, &zsa, | |
b5256303 | 1431 | claim_txg, B_FALSE); |
428870ff BB |
1432 | |
1433 | zil_free(zilog); | |
1434 | } | |
1435 | ||
d4a72f23 TC |
1436 | /* |
1437 | * We compare scan_prefetch_issue_ctx_t's based on their bookmarks. The idea | |
1438 | * here is to sort the AVL tree by the order each block will be needed. | |
1439 | */ | |
1440 | static int | |
1441 | scan_prefetch_queue_compare(const void *a, const void *b) | |
428870ff | 1442 | { |
d4a72f23 TC |
1443 | const scan_prefetch_issue_ctx_t *spic_a = a, *spic_b = b; |
1444 | const scan_prefetch_ctx_t *spc_a = spic_a->spic_spc; | |
1445 | const scan_prefetch_ctx_t *spc_b = spic_b->spic_spc; | |
428870ff | 1446 | |
d4a72f23 TC |
1447 | return (zbookmark_compare(spc_a->spc_datablkszsec, |
1448 | spc_a->spc_indblkshift, spc_b->spc_datablkszsec, | |
1449 | spc_b->spc_indblkshift, &spic_a->spic_zb, &spic_b->spic_zb)); | |
1450 | } | |
428870ff | 1451 | |
d4a72f23 TC |
1452 | static void |
1453 | scan_prefetch_ctx_rele(scan_prefetch_ctx_t *spc, void *tag) | |
1454 | { | |
424fd7c3 TS |
1455 | if (zfs_refcount_remove(&spc->spc_refcnt, tag) == 0) { |
1456 | zfs_refcount_destroy(&spc->spc_refcnt); | |
d4a72f23 TC |
1457 | kmem_free(spc, sizeof (scan_prefetch_ctx_t)); |
1458 | } | |
1459 | } | |
1460 | ||
1461 | static scan_prefetch_ctx_t * | |
1462 | scan_prefetch_ctx_create(dsl_scan_t *scn, dnode_phys_t *dnp, void *tag) | |
1463 | { | |
1464 | scan_prefetch_ctx_t *spc; | |
1465 | ||
1466 | spc = kmem_alloc(sizeof (scan_prefetch_ctx_t), KM_SLEEP); | |
424fd7c3 | 1467 | zfs_refcount_create(&spc->spc_refcnt); |
c13060e4 | 1468 | zfs_refcount_add(&spc->spc_refcnt, tag); |
d4a72f23 TC |
1469 | spc->spc_scn = scn; |
1470 | if (dnp != NULL) { | |
1471 | spc->spc_datablkszsec = dnp->dn_datablkszsec; | |
1472 | spc->spc_indblkshift = dnp->dn_indblkshift; | |
1473 | spc->spc_root = B_FALSE; | |
1474 | } else { | |
1475 | spc->spc_datablkszsec = 0; | |
1476 | spc->spc_indblkshift = 0; | |
1477 | spc->spc_root = B_TRUE; | |
1478 | } | |
1479 | ||
1480 | return (spc); | |
1481 | } | |
1482 | ||
1483 | static void | |
1484 | scan_prefetch_ctx_add_ref(scan_prefetch_ctx_t *spc, void *tag) | |
1485 | { | |
c13060e4 | 1486 | zfs_refcount_add(&spc->spc_refcnt, tag); |
d4a72f23 TC |
1487 | } |
1488 | ||
d6496040 TC |
1489 | static void |
1490 | scan_ds_prefetch_queue_clear(dsl_scan_t *scn) | |
1491 | { | |
1492 | spa_t *spa = scn->scn_dp->dp_spa; | |
1493 | void *cookie = NULL; | |
1494 | scan_prefetch_issue_ctx_t *spic = NULL; | |
1495 | ||
1496 | mutex_enter(&spa->spa_scrub_lock); | |
1497 | while ((spic = avl_destroy_nodes(&scn->scn_prefetch_queue, | |
1498 | &cookie)) != NULL) { | |
1499 | scan_prefetch_ctx_rele(spic->spic_spc, scn); | |
1500 | kmem_free(spic, sizeof (scan_prefetch_issue_ctx_t)); | |
1501 | } | |
1502 | mutex_exit(&spa->spa_scrub_lock); | |
1503 | } | |
1504 | ||
d4a72f23 TC |
1505 | static boolean_t |
1506 | dsl_scan_check_prefetch_resume(scan_prefetch_ctx_t *spc, | |
1507 | const zbookmark_phys_t *zb) | |
1508 | { | |
1509 | zbookmark_phys_t *last_zb = &spc->spc_scn->scn_prefetch_bookmark; | |
1510 | dnode_phys_t tmp_dnp; | |
1511 | dnode_phys_t *dnp = (spc->spc_root) ? NULL : &tmp_dnp; | |
1512 | ||
1513 | if (zb->zb_objset != last_zb->zb_objset) | |
1514 | return (B_TRUE); | |
1515 | if ((int64_t)zb->zb_object < 0) | |
1516 | return (B_FALSE); | |
1517 | ||
1518 | tmp_dnp.dn_datablkszsec = spc->spc_datablkszsec; | |
1519 | tmp_dnp.dn_indblkshift = spc->spc_indblkshift; | |
1520 | ||
1521 | if (zbookmark_subtree_completed(dnp, zb, last_zb)) | |
1522 | return (B_TRUE); | |
1523 | ||
1524 | return (B_FALSE); | |
1525 | } | |
1526 | ||
1527 | static void | |
1528 | dsl_scan_prefetch(scan_prefetch_ctx_t *spc, blkptr_t *bp, zbookmark_phys_t *zb) | |
1529 | { | |
1530 | avl_index_t idx; | |
1531 | dsl_scan_t *scn = spc->spc_scn; | |
1532 | spa_t *spa = scn->scn_dp->dp_spa; | |
1533 | scan_prefetch_issue_ctx_t *spic; | |
1534 | ||
30af21b0 | 1535 | if (zfs_no_scrub_prefetch || BP_IS_REDACTED(bp)) |
d4a72f23 TC |
1536 | return; |
1537 | ||
1538 | if (BP_IS_HOLE(bp) || bp->blk_birth <= scn->scn_phys.scn_cur_min_txg || | |
1539 | (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_DNODE && | |
1540 | BP_GET_TYPE(bp) != DMU_OT_OBJSET)) | |
1541 | return; | |
1542 | ||
1543 | if (dsl_scan_check_prefetch_resume(spc, zb)) | |
1544 | return; | |
1545 | ||
1546 | scan_prefetch_ctx_add_ref(spc, scn); | |
1547 | spic = kmem_alloc(sizeof (scan_prefetch_issue_ctx_t), KM_SLEEP); | |
1548 | spic->spic_spc = spc; | |
1549 | spic->spic_bp = *bp; | |
1550 | spic->spic_zb = *zb; | |
1551 | ||
1552 | /* | |
1553 | * Add the IO to the queue of blocks to prefetch. This allows us to | |
1554 | * prioritize blocks that we will need first for the main traversal | |
1555 | * thread. | |
1556 | */ | |
1557 | mutex_enter(&spa->spa_scrub_lock); | |
1558 | if (avl_find(&scn->scn_prefetch_queue, spic, &idx) != NULL) { | |
1559 | /* this block is already queued for prefetch */ | |
1560 | kmem_free(spic, sizeof (scan_prefetch_issue_ctx_t)); | |
1561 | scan_prefetch_ctx_rele(spc, scn); | |
1562 | mutex_exit(&spa->spa_scrub_lock); | |
1563 | return; | |
1564 | } | |
1565 | ||
1566 | avl_insert(&scn->scn_prefetch_queue, spic, idx); | |
1567 | cv_broadcast(&spa->spa_scrub_io_cv); | |
1568 | mutex_exit(&spa->spa_scrub_lock); | |
1569 | } | |
1570 | ||
1571 | static void | |
1572 | dsl_scan_prefetch_dnode(dsl_scan_t *scn, dnode_phys_t *dnp, | |
1573 | uint64_t objset, uint64_t object) | |
1574 | { | |
1575 | int i; | |
1576 | zbookmark_phys_t zb; | |
1577 | scan_prefetch_ctx_t *spc; | |
1578 | ||
1579 | if (dnp->dn_nblkptr == 0 && !(dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) | |
1580 | return; | |
1581 | ||
1582 | SET_BOOKMARK(&zb, objset, object, 0, 0); | |
1583 | ||
1584 | spc = scan_prefetch_ctx_create(scn, dnp, FTAG); | |
1585 | ||
1586 | for (i = 0; i < dnp->dn_nblkptr; i++) { | |
1587 | zb.zb_level = BP_GET_LEVEL(&dnp->dn_blkptr[i]); | |
1588 | zb.zb_blkid = i; | |
1589 | dsl_scan_prefetch(spc, &dnp->dn_blkptr[i], &zb); | |
1590 | } | |
1591 | ||
1592 | if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) { | |
1593 | zb.zb_level = 0; | |
1594 | zb.zb_blkid = DMU_SPILL_BLKID; | |
1595 | dsl_scan_prefetch(spc, DN_SPILL_BLKPTR(dnp), &zb); | |
1596 | } | |
1597 | ||
1598 | scan_prefetch_ctx_rele(spc, FTAG); | |
1599 | } | |
1600 | ||
1601 | void | |
1602 | dsl_scan_prefetch_cb(zio_t *zio, const zbookmark_phys_t *zb, const blkptr_t *bp, | |
1603 | arc_buf_t *buf, void *private) | |
1604 | { | |
1605 | scan_prefetch_ctx_t *spc = private; | |
1606 | dsl_scan_t *scn = spc->spc_scn; | |
1607 | spa_t *spa = scn->scn_dp->dp_spa; | |
1608 | ||
13a2ff27 | 1609 | /* broadcast that the IO has completed for rate limiting purposes */ |
d4a72f23 TC |
1610 | mutex_enter(&spa->spa_scrub_lock); |
1611 | ASSERT3U(spa->spa_scrub_inflight, >=, BP_GET_PSIZE(bp)); | |
1612 | spa->spa_scrub_inflight -= BP_GET_PSIZE(bp); | |
1613 | cv_broadcast(&spa->spa_scrub_io_cv); | |
1614 | mutex_exit(&spa->spa_scrub_lock); | |
1615 | ||
1616 | /* if there was an error or we are done prefetching, just cleanup */ | |
13a2ff27 | 1617 | if (buf == NULL || scn->scn_prefetch_stop) |
d4a72f23 TC |
1618 | goto out; |
1619 | ||
1620 | if (BP_GET_LEVEL(bp) > 0) { | |
1621 | int i; | |
1622 | blkptr_t *cbp; | |
1623 | int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT; | |
1624 | zbookmark_phys_t czb; | |
1625 | ||
1626 | for (i = 0, cbp = buf->b_data; i < epb; i++, cbp++) { | |
1627 | SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object, | |
1628 | zb->zb_level - 1, zb->zb_blkid * epb + i); | |
1629 | dsl_scan_prefetch(spc, cbp, &czb); | |
1630 | } | |
1631 | } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) { | |
1632 | dnode_phys_t *cdnp; | |
1633 | int i; | |
1634 | int epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT; | |
1635 | ||
1636 | for (i = 0, cdnp = buf->b_data; i < epb; | |
1637 | i += cdnp->dn_extra_slots + 1, | |
1638 | cdnp += cdnp->dn_extra_slots + 1) { | |
1639 | dsl_scan_prefetch_dnode(scn, cdnp, | |
1640 | zb->zb_objset, zb->zb_blkid * epb + i); | |
1641 | } | |
1642 | } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) { | |
1643 | objset_phys_t *osp = buf->b_data; | |
1644 | ||
1645 | dsl_scan_prefetch_dnode(scn, &osp->os_meta_dnode, | |
1646 | zb->zb_objset, DMU_META_DNODE_OBJECT); | |
1647 | ||
1648 | if (OBJSET_BUF_HAS_USERUSED(buf)) { | |
1649 | dsl_scan_prefetch_dnode(scn, | |
1650 | &osp->os_groupused_dnode, zb->zb_objset, | |
1651 | DMU_GROUPUSED_OBJECT); | |
1652 | dsl_scan_prefetch_dnode(scn, | |
1653 | &osp->os_userused_dnode, zb->zb_objset, | |
1654 | DMU_USERUSED_OBJECT); | |
1655 | } | |
1656 | } | |
1657 | ||
1658 | out: | |
1659 | if (buf != NULL) | |
1660 | arc_buf_destroy(buf, private); | |
1661 | scan_prefetch_ctx_rele(spc, scn); | |
1662 | } | |
1663 | ||
1664 | /* ARGSUSED */ | |
1665 | static void | |
1666 | dsl_scan_prefetch_thread(void *arg) | |
1667 | { | |
1668 | dsl_scan_t *scn = arg; | |
1669 | spa_t *spa = scn->scn_dp->dp_spa; | |
1670 | scan_prefetch_issue_ctx_t *spic; | |
1671 | ||
1672 | /* loop until we are told to stop */ | |
1673 | while (!scn->scn_prefetch_stop) { | |
1674 | arc_flags_t flags = ARC_FLAG_NOWAIT | | |
1675 | ARC_FLAG_PRESCIENT_PREFETCH | ARC_FLAG_PREFETCH; | |
1676 | int zio_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_SCAN_THREAD; | |
1677 | ||
1678 | mutex_enter(&spa->spa_scrub_lock); | |
1679 | ||
1680 | /* | |
1681 | * Wait until we have an IO to issue and are not above our | |
1682 | * maximum in flight limit. | |
1683 | */ | |
1684 | while (!scn->scn_prefetch_stop && | |
1685 | (avl_numnodes(&scn->scn_prefetch_queue) == 0 || | |
1686 | spa->spa_scrub_inflight >= scn->scn_maxinflight_bytes)) { | |
1687 | cv_wait(&spa->spa_scrub_io_cv, &spa->spa_scrub_lock); | |
1688 | } | |
1689 | ||
1690 | /* recheck if we should stop since we waited for the cv */ | |
1691 | if (scn->scn_prefetch_stop) { | |
1692 | mutex_exit(&spa->spa_scrub_lock); | |
1693 | break; | |
1694 | } | |
1695 | ||
1696 | /* remove the prefetch IO from the tree */ | |
1697 | spic = avl_first(&scn->scn_prefetch_queue); | |
1698 | spa->spa_scrub_inflight += BP_GET_PSIZE(&spic->spic_bp); | |
1699 | avl_remove(&scn->scn_prefetch_queue, spic); | |
1700 | ||
1701 | mutex_exit(&spa->spa_scrub_lock); | |
1702 | ||
1703 | if (BP_IS_PROTECTED(&spic->spic_bp)) { | |
1704 | ASSERT(BP_GET_TYPE(&spic->spic_bp) == DMU_OT_DNODE || | |
1705 | BP_GET_TYPE(&spic->spic_bp) == DMU_OT_OBJSET); | |
1706 | ASSERT3U(BP_GET_LEVEL(&spic->spic_bp), ==, 0); | |
1707 | zio_flags |= ZIO_FLAG_RAW; | |
1708 | } | |
1709 | ||
1710 | /* issue the prefetch asynchronously */ | |
1711 | (void) arc_read(scn->scn_zio_root, scn->scn_dp->dp_spa, | |
1712 | &spic->spic_bp, dsl_scan_prefetch_cb, spic->spic_spc, | |
a8b2e306 | 1713 | ZIO_PRIORITY_SCRUB, zio_flags, &flags, &spic->spic_zb); |
428870ff | 1714 | |
d4a72f23 | 1715 | kmem_free(spic, sizeof (scan_prefetch_issue_ctx_t)); |
b5256303 TC |
1716 | } |
1717 | ||
d4a72f23 | 1718 | ASSERT(scn->scn_prefetch_stop); |
428870ff | 1719 | |
d4a72f23 TC |
1720 | /* free any prefetches we didn't get to complete */ |
1721 | mutex_enter(&spa->spa_scrub_lock); | |
1722 | while ((spic = avl_first(&scn->scn_prefetch_queue)) != NULL) { | |
1723 | avl_remove(&scn->scn_prefetch_queue, spic); | |
1724 | scan_prefetch_ctx_rele(spic->spic_spc, scn); | |
1725 | kmem_free(spic, sizeof (scan_prefetch_issue_ctx_t)); | |
1726 | } | |
1727 | ASSERT0(avl_numnodes(&scn->scn_prefetch_queue)); | |
1728 | mutex_exit(&spa->spa_scrub_lock); | |
428870ff BB |
1729 | } |
1730 | ||
1731 | static boolean_t | |
1732 | dsl_scan_check_resume(dsl_scan_t *scn, const dnode_phys_t *dnp, | |
5dbd68a3 | 1733 | const zbookmark_phys_t *zb) |
428870ff BB |
1734 | { |
1735 | /* | |
1736 | * We never skip over user/group accounting objects (obj<0) | |
1737 | */ | |
9ae529ec | 1738 | if (!ZB_IS_ZERO(&scn->scn_phys.scn_bookmark) && |
428870ff BB |
1739 | (int64_t)zb->zb_object >= 0) { |
1740 | /* | |
1741 | * If we already visited this bp & everything below (in | |
1742 | * a prior txg sync), don't bother doing it again. | |
1743 | */ | |
fcff0f35 PD |
1744 | if (zbookmark_subtree_completed(dnp, zb, |
1745 | &scn->scn_phys.scn_bookmark)) | |
428870ff BB |
1746 | return (B_TRUE); |
1747 | ||
1748 | /* | |
1749 | * If we found the block we're trying to resume from, or | |
1750 | * we went past it to a different object, zero it out to | |
0ea05c64 | 1751 | * indicate that it's OK to start checking for suspending |
428870ff BB |
1752 | * again. |
1753 | */ | |
1754 | if (bcmp(zb, &scn->scn_phys.scn_bookmark, sizeof (*zb)) == 0 || | |
1755 | zb->zb_object > scn->scn_phys.scn_bookmark.zb_object) { | |
1756 | dprintf("resuming at %llx/%llx/%llx/%llx\n", | |
1757 | (longlong_t)zb->zb_objset, | |
1758 | (longlong_t)zb->zb_object, | |
1759 | (longlong_t)zb->zb_level, | |
1760 | (longlong_t)zb->zb_blkid); | |
1761 | bzero(&scn->scn_phys.scn_bookmark, sizeof (*zb)); | |
1762 | } | |
1763 | } | |
1764 | return (B_FALSE); | |
1765 | } | |
1766 | ||
d4a72f23 TC |
1767 | static void dsl_scan_visitbp(blkptr_t *bp, const zbookmark_phys_t *zb, |
1768 | dnode_phys_t *dnp, dsl_dataset_t *ds, dsl_scan_t *scn, | |
1769 | dmu_objset_type_t ostype, dmu_tx_t *tx); | |
1770 | inline __attribute__((always_inline)) static void dsl_scan_visitdnode( | |
1771 | dsl_scan_t *, dsl_dataset_t *ds, dmu_objset_type_t ostype, | |
1772 | dnode_phys_t *dnp, uint64_t object, dmu_tx_t *tx); | |
1773 | ||
428870ff BB |
1774 | /* |
1775 | * Return nonzero on i/o error. | |
1776 | * Return new buf to write out in *bufp. | |
1777 | */ | |
10be533e | 1778 | inline __attribute__((always_inline)) static int |
428870ff BB |
1779 | dsl_scan_recurse(dsl_scan_t *scn, dsl_dataset_t *ds, dmu_objset_type_t ostype, |
1780 | dnode_phys_t *dnp, const blkptr_t *bp, | |
ebcf4936 | 1781 | const zbookmark_phys_t *zb, dmu_tx_t *tx) |
428870ff BB |
1782 | { |
1783 | dsl_pool_t *dp = scn->scn_dp; | |
572e2857 | 1784 | int zio_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_SCAN_THREAD; |
428870ff BB |
1785 | int err; |
1786 | ||
30af21b0 PD |
1787 | ASSERT(!BP_IS_REDACTED(bp)); |
1788 | ||
428870ff | 1789 | if (BP_GET_LEVEL(bp) > 0) { |
2a432414 | 1790 | arc_flags_t flags = ARC_FLAG_WAIT; |
428870ff BB |
1791 | int i; |
1792 | blkptr_t *cbp; | |
1793 | int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT; | |
ebcf4936 | 1794 | arc_buf_t *buf; |
428870ff | 1795 | |
ebcf4936 | 1796 | err = arc_read(NULL, dp->dp_spa, bp, arc_getbuf_func, &buf, |
a8b2e306 | 1797 | ZIO_PRIORITY_SCRUB, zio_flags, &flags, zb); |
428870ff BB |
1798 | if (err) { |
1799 | scn->scn_phys.scn_errors++; | |
1800 | return (err); | |
1801 | } | |
ebcf4936 | 1802 | for (i = 0, cbp = buf->b_data; i < epb; i++, cbp++) { |
5dbd68a3 | 1803 | zbookmark_phys_t czb; |
428870ff BB |
1804 | |
1805 | SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object, | |
1806 | zb->zb_level - 1, | |
1807 | zb->zb_blkid * epb + i); | |
1808 | dsl_scan_visitbp(cbp, &czb, dnp, | |
ebcf4936 | 1809 | ds, scn, ostype, tx); |
428870ff | 1810 | } |
d3c2ae1c | 1811 | arc_buf_destroy(buf, &buf); |
428870ff | 1812 | } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) { |
2a432414 | 1813 | arc_flags_t flags = ARC_FLAG_WAIT; |
428870ff | 1814 | dnode_phys_t *cdnp; |
d4a72f23 | 1815 | int i; |
428870ff | 1816 | int epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT; |
ebcf4936 | 1817 | arc_buf_t *buf; |
428870ff | 1818 | |
b5256303 TC |
1819 | if (BP_IS_PROTECTED(bp)) { |
1820 | ASSERT3U(BP_GET_COMPRESS(bp), ==, ZIO_COMPRESS_OFF); | |
1821 | zio_flags |= ZIO_FLAG_RAW; | |
1822 | } | |
1823 | ||
ebcf4936 | 1824 | err = arc_read(NULL, dp->dp_spa, bp, arc_getbuf_func, &buf, |
a8b2e306 | 1825 | ZIO_PRIORITY_SCRUB, zio_flags, &flags, zb); |
428870ff BB |
1826 | if (err) { |
1827 | scn->scn_phys.scn_errors++; | |
1828 | return (err); | |
1829 | } | |
50c957f7 NB |
1830 | for (i = 0, cdnp = buf->b_data; i < epb; |
1831 | i += cdnp->dn_extra_slots + 1, | |
1832 | cdnp += cdnp->dn_extra_slots + 1) { | |
428870ff | 1833 | dsl_scan_visitdnode(scn, ds, ostype, |
ebcf4936 | 1834 | cdnp, zb->zb_blkid * epb + i, tx); |
428870ff BB |
1835 | } |
1836 | ||
d3c2ae1c | 1837 | arc_buf_destroy(buf, &buf); |
428870ff | 1838 | } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) { |
2a432414 | 1839 | arc_flags_t flags = ARC_FLAG_WAIT; |
428870ff | 1840 | objset_phys_t *osp; |
ebcf4936 | 1841 | arc_buf_t *buf; |
428870ff | 1842 | |
ebcf4936 | 1843 | err = arc_read(NULL, dp->dp_spa, bp, arc_getbuf_func, &buf, |
a8b2e306 | 1844 | ZIO_PRIORITY_SCRUB, zio_flags, &flags, zb); |
428870ff BB |
1845 | if (err) { |
1846 | scn->scn_phys.scn_errors++; | |
1847 | return (err); | |
1848 | } | |
1849 | ||
ebcf4936 | 1850 | osp = buf->b_data; |
428870ff | 1851 | |
428870ff | 1852 | dsl_scan_visitdnode(scn, ds, osp->os_type, |
ebcf4936 | 1853 | &osp->os_meta_dnode, DMU_META_DNODE_OBJECT, tx); |
428870ff | 1854 | |
ebcf4936 | 1855 | if (OBJSET_BUF_HAS_USERUSED(buf)) { |
428870ff | 1856 | /* |
9c5167d1 | 1857 | * We also always visit user/group/project accounting |
428870ff | 1858 | * objects, and never skip them, even if we are |
d4a72f23 TC |
1859 | * suspending. This is necessary so that the |
1860 | * space deltas from this txg get integrated. | |
428870ff | 1861 | */ |
9c5167d1 NF |
1862 | if (OBJSET_BUF_HAS_PROJECTUSED(buf)) |
1863 | dsl_scan_visitdnode(scn, ds, osp->os_type, | |
1864 | &osp->os_projectused_dnode, | |
1865 | DMU_PROJECTUSED_OBJECT, tx); | |
428870ff | 1866 | dsl_scan_visitdnode(scn, ds, osp->os_type, |
ebcf4936 | 1867 | &osp->os_groupused_dnode, |
428870ff BB |
1868 | DMU_GROUPUSED_OBJECT, tx); |
1869 | dsl_scan_visitdnode(scn, ds, osp->os_type, | |
ebcf4936 | 1870 | &osp->os_userused_dnode, |
428870ff BB |
1871 | DMU_USERUSED_OBJECT, tx); |
1872 | } | |
d3c2ae1c | 1873 | arc_buf_destroy(buf, &buf); |
428870ff BB |
1874 | } |
1875 | ||
1876 | return (0); | |
1877 | } | |
1878 | ||
10be533e | 1879 | inline __attribute__((always_inline)) static void |
428870ff | 1880 | dsl_scan_visitdnode(dsl_scan_t *scn, dsl_dataset_t *ds, |
ebcf4936 | 1881 | dmu_objset_type_t ostype, dnode_phys_t *dnp, |
428870ff BB |
1882 | uint64_t object, dmu_tx_t *tx) |
1883 | { | |
1884 | int j; | |
1885 | ||
1886 | for (j = 0; j < dnp->dn_nblkptr; j++) { | |
5dbd68a3 | 1887 | zbookmark_phys_t czb; |
428870ff BB |
1888 | |
1889 | SET_BOOKMARK(&czb, ds ? ds->ds_object : 0, object, | |
1890 | dnp->dn_nlevels - 1, j); | |
1891 | dsl_scan_visitbp(&dnp->dn_blkptr[j], | |
ebcf4936 | 1892 | &czb, dnp, ds, scn, ostype, tx); |
428870ff BB |
1893 | } |
1894 | ||
1895 | if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) { | |
5dbd68a3 | 1896 | zbookmark_phys_t czb; |
428870ff BB |
1897 | SET_BOOKMARK(&czb, ds ? ds->ds_object : 0, object, |
1898 | 0, DMU_SPILL_BLKID); | |
50c957f7 | 1899 | dsl_scan_visitbp(DN_SPILL_BLKPTR(dnp), |
ebcf4936 | 1900 | &czb, dnp, ds, scn, ostype, tx); |
428870ff BB |
1901 | } |
1902 | } | |
1903 | ||
1904 | /* | |
1905 | * The arguments are in this order because mdb can only print the | |
1906 | * first 5; we want them to be useful. | |
1907 | */ | |
1908 | static void | |
5dbd68a3 | 1909 | dsl_scan_visitbp(blkptr_t *bp, const zbookmark_phys_t *zb, |
ebcf4936 MA |
1910 | dnode_phys_t *dnp, dsl_dataset_t *ds, dsl_scan_t *scn, |
1911 | dmu_objset_type_t ostype, dmu_tx_t *tx) | |
428870ff BB |
1912 | { |
1913 | dsl_pool_t *dp = scn->scn_dp; | |
d4a72f23 | 1914 | blkptr_t *bp_toread = NULL; |
428870ff | 1915 | |
0ea05c64 | 1916 | if (dsl_scan_check_suspend(scn, zb)) |
d4a72f23 | 1917 | return; |
428870ff BB |
1918 | |
1919 | if (dsl_scan_check_resume(scn, dnp, zb)) | |
d4a72f23 | 1920 | return; |
428870ff BB |
1921 | |
1922 | scn->scn_visited_this_txg++; | |
1923 | ||
b81c4ac9 BB |
1924 | /* |
1925 | * This debugging is commented out to conserve stack space. This | |
e1cfd73f | 1926 | * function is called recursively and the debugging adds several |
b81c4ac9 BB |
1927 | * bytes to the stack for each call. It can be commented back in |
1928 | * if required to debug an issue in dsl_scan_visitbp(). | |
1929 | * | |
1930 | * dprintf_bp(bp, | |
d4a72f23 TC |
1931 | * "visiting ds=%p/%llu zb=%llx/%llx/%llx/%llx bp=%p", |
1932 | * ds, ds ? ds->ds_object : 0, | |
1933 | * zb->zb_objset, zb->zb_object, zb->zb_level, zb->zb_blkid, | |
1934 | * bp); | |
b81c4ac9 | 1935 | */ |
428870ff | 1936 | |
d4a72f23 TC |
1937 | if (BP_IS_HOLE(bp)) { |
1938 | scn->scn_holes_this_txg++; | |
1939 | return; | |
1940 | } | |
1941 | ||
30af21b0 PD |
1942 | if (BP_IS_REDACTED(bp)) { |
1943 | ASSERT(dsl_dataset_feature_is_active(ds, | |
1944 | SPA_FEATURE_REDACTED_DATASETS)); | |
1945 | return; | |
1946 | } | |
1947 | ||
d4a72f23 TC |
1948 | if (bp->blk_birth <= scn->scn_phys.scn_cur_min_txg) { |
1949 | scn->scn_lt_min_this_txg++; | |
1950 | return; | |
1951 | } | |
1952 | ||
1953 | bp_toread = kmem_alloc(sizeof (blkptr_t), KM_SLEEP); | |
1954 | *bp_toread = *bp; | |
428870ff | 1955 | |
ebcf4936 | 1956 | if (dsl_scan_recurse(scn, ds, ostype, dnp, bp_toread, zb, tx) != 0) |
161ce7ce | 1957 | goto out; |
428870ff BB |
1958 | |
1959 | /* | |
4e33ba4c | 1960 | * If dsl_scan_ddt() has already visited this block, it will have |
428870ff BB |
1961 | * already done any translations or scrubbing, so don't call the |
1962 | * callback again. | |
1963 | */ | |
1964 | if (ddt_class_contains(dp->dp_spa, | |
1965 | scn->scn_phys.scn_ddt_class_max, bp)) { | |
d4a72f23 | 1966 | scn->scn_ddt_contained_this_txg++; |
161ce7ce | 1967 | goto out; |
428870ff BB |
1968 | } |
1969 | ||
1970 | /* | |
1971 | * If this block is from the future (after cur_max_txg), then we | |
1972 | * are doing this on behalf of a deleted snapshot, and we will | |
1973 | * revisit the future block on the next pass of this dataset. | |
1974 | * Don't scan it now unless we need to because something | |
1975 | * under it was modified. | |
1976 | */ | |
d4a72f23 TC |
1977 | if (BP_PHYSICAL_BIRTH(bp) > scn->scn_phys.scn_cur_max_txg) { |
1978 | scn->scn_gt_max_this_txg++; | |
1979 | goto out; | |
428870ff | 1980 | } |
d4a72f23 TC |
1981 | |
1982 | scan_funcs[scn->scn_phys.scn_func](dp, bp, zb); | |
1983 | ||
161ce7ce | 1984 | out: |
d1d7e268 | 1985 | kmem_free(bp_toread, sizeof (blkptr_t)); |
428870ff BB |
1986 | } |
1987 | ||
1988 | static void | |
1989 | dsl_scan_visit_rootbp(dsl_scan_t *scn, dsl_dataset_t *ds, blkptr_t *bp, | |
1990 | dmu_tx_t *tx) | |
1991 | { | |
5dbd68a3 | 1992 | zbookmark_phys_t zb; |
d4a72f23 | 1993 | scan_prefetch_ctx_t *spc; |
428870ff BB |
1994 | |
1995 | SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET, | |
1996 | ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); | |
d4a72f23 TC |
1997 | |
1998 | if (ZB_IS_ZERO(&scn->scn_phys.scn_bookmark)) { | |
1999 | SET_BOOKMARK(&scn->scn_prefetch_bookmark, | |
2000 | zb.zb_objset, 0, 0, 0); | |
2001 | } else { | |
2002 | scn->scn_prefetch_bookmark = scn->scn_phys.scn_bookmark; | |
2003 | } | |
2004 | ||
2005 | scn->scn_objsets_visited_this_txg++; | |
2006 | ||
2007 | spc = scan_prefetch_ctx_create(scn, NULL, FTAG); | |
2008 | dsl_scan_prefetch(spc, bp, &zb); | |
2009 | scan_prefetch_ctx_rele(spc, FTAG); | |
2010 | ||
2011 | dsl_scan_visitbp(bp, &zb, NULL, ds, scn, DMU_OST_NONE, tx); | |
428870ff BB |
2012 | |
2013 | dprintf_ds(ds, "finished scan%s", ""); | |
2014 | } | |
2015 | ||
d4a72f23 TC |
2016 | static void |
2017 | ds_destroyed_scn_phys(dsl_dataset_t *ds, dsl_scan_phys_t *scn_phys) | |
428870ff | 2018 | { |
d4a72f23 | 2019 | if (scn_phys->scn_bookmark.zb_objset == ds->ds_object) { |
0c66c32d | 2020 | if (ds->ds_is_snapshot) { |
b77222c8 MA |
2021 | /* |
2022 | * Note: | |
2023 | * - scn_cur_{min,max}_txg stays the same. | |
2024 | * - Setting the flag is not really necessary if | |
2025 | * scn_cur_max_txg == scn_max_txg, because there | |
2026 | * is nothing after this snapshot that we care | |
2027 | * about. However, we set it anyway and then | |
2028 | * ignore it when we retraverse it in | |
2029 | * dsl_scan_visitds(). | |
2030 | */ | |
d4a72f23 | 2031 | scn_phys->scn_bookmark.zb_objset = |
d683ddbb | 2032 | dsl_dataset_phys(ds)->ds_next_snap_obj; |
428870ff BB |
2033 | zfs_dbgmsg("destroying ds %llu; currently traversing; " |
2034 | "reset zb_objset to %llu", | |
2035 | (u_longlong_t)ds->ds_object, | |
d683ddbb JG |
2036 | (u_longlong_t)dsl_dataset_phys(ds)-> |
2037 | ds_next_snap_obj); | |
d4a72f23 | 2038 | scn_phys->scn_flags |= DSF_VISIT_DS_AGAIN; |
428870ff | 2039 | } else { |
d4a72f23 | 2040 | SET_BOOKMARK(&scn_phys->scn_bookmark, |
428870ff BB |
2041 | ZB_DESTROYED_OBJSET, 0, 0, 0); |
2042 | zfs_dbgmsg("destroying ds %llu; currently traversing; " | |
2043 | "reset bookmark to -1,0,0,0", | |
2044 | (u_longlong_t)ds->ds_object); | |
2045 | } | |
d4a72f23 TC |
2046 | } |
2047 | } | |
2048 | ||
2049 | /* | |
2050 | * Invoked when a dataset is destroyed. We need to make sure that: | |
2051 | * | |
2052 | * 1) If it is the dataset that was currently being scanned, we write | |
2053 | * a new dsl_scan_phys_t and marking the objset reference in it | |
2054 | * as destroyed. | |
2055 | * 2) Remove it from the work queue, if it was present. | |
2056 | * | |
2057 | * If the dataset was actually a snapshot, instead of marking the dataset | |
2058 | * as destroyed, we instead substitute the next snapshot in line. | |
2059 | */ | |
2060 | void | |
2061 | dsl_scan_ds_destroyed(dsl_dataset_t *ds, dmu_tx_t *tx) | |
2062 | { | |
2063 | dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
2064 | dsl_scan_t *scn = dp->dp_scan; | |
2065 | uint64_t mintxg; | |
2066 | ||
2067 | if (!dsl_scan_is_running(scn)) | |
2068 | return; | |
2069 | ||
2070 | ds_destroyed_scn_phys(ds, &scn->scn_phys); | |
2071 | ds_destroyed_scn_phys(ds, &scn->scn_phys_cached); | |
2072 | ||
2073 | if (scan_ds_queue_contains(scn, ds->ds_object, &mintxg)) { | |
2074 | scan_ds_queue_remove(scn, ds->ds_object); | |
2075 | if (ds->ds_is_snapshot) | |
2076 | scan_ds_queue_insert(scn, | |
2077 | dsl_dataset_phys(ds)->ds_next_snap_obj, mintxg); | |
2078 | } | |
2079 | ||
2080 | if (zap_lookup_int_key(dp->dp_meta_objset, scn->scn_phys.scn_queue_obj, | |
2081 | ds->ds_object, &mintxg) == 0) { | |
d683ddbb | 2082 | ASSERT3U(dsl_dataset_phys(ds)->ds_num_children, <=, 1); |
428870ff BB |
2083 | VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, |
2084 | scn->scn_phys.scn_queue_obj, ds->ds_object, tx)); | |
0c66c32d | 2085 | if (ds->ds_is_snapshot) { |
428870ff BB |
2086 | /* |
2087 | * We keep the same mintxg; it could be > | |
2088 | * ds_creation_txg if the previous snapshot was | |
2089 | * deleted too. | |
2090 | */ | |
2091 | VERIFY(zap_add_int_key(dp->dp_meta_objset, | |
2092 | scn->scn_phys.scn_queue_obj, | |
d683ddbb JG |
2093 | dsl_dataset_phys(ds)->ds_next_snap_obj, |
2094 | mintxg, tx) == 0); | |
428870ff BB |
2095 | zfs_dbgmsg("destroying ds %llu; in queue; " |
2096 | "replacing with %llu", | |
2097 | (u_longlong_t)ds->ds_object, | |
d683ddbb JG |
2098 | (u_longlong_t)dsl_dataset_phys(ds)-> |
2099 | ds_next_snap_obj); | |
428870ff BB |
2100 | } else { |
2101 | zfs_dbgmsg("destroying ds %llu; in queue; removing", | |
2102 | (u_longlong_t)ds->ds_object); | |
2103 | } | |
428870ff BB |
2104 | } |
2105 | ||
2106 | /* | |
2107 | * dsl_scan_sync() should be called after this, and should sync | |
2108 | * out our changed state, but just to be safe, do it here. | |
2109 | */ | |
d4a72f23 TC |
2110 | dsl_scan_sync_state(scn, tx, SYNC_CACHED); |
2111 | } | |
2112 | ||
2113 | static void | |
2114 | ds_snapshotted_bookmark(dsl_dataset_t *ds, zbookmark_phys_t *scn_bookmark) | |
2115 | { | |
2116 | if (scn_bookmark->zb_objset == ds->ds_object) { | |
2117 | scn_bookmark->zb_objset = | |
2118 | dsl_dataset_phys(ds)->ds_prev_snap_obj; | |
2119 | zfs_dbgmsg("snapshotting ds %llu; currently traversing; " | |
2120 | "reset zb_objset to %llu", | |
2121 | (u_longlong_t)ds->ds_object, | |
2122 | (u_longlong_t)dsl_dataset_phys(ds)->ds_prev_snap_obj); | |
2123 | } | |
428870ff BB |
2124 | } |
2125 | ||
d4a72f23 TC |
2126 | /* |
2127 | * Called when a dataset is snapshotted. If we were currently traversing | |
2128 | * this snapshot, we reset our bookmark to point at the newly created | |
2129 | * snapshot. We also modify our work queue to remove the old snapshot and | |
2130 | * replace with the new one. | |
2131 | */ | |
428870ff BB |
2132 | void |
2133 | dsl_scan_ds_snapshotted(dsl_dataset_t *ds, dmu_tx_t *tx) | |
2134 | { | |
2135 | dsl_pool_t *dp = ds->ds_dir->dd_pool; | |
2136 | dsl_scan_t *scn = dp->dp_scan; | |
2137 | uint64_t mintxg; | |
2138 | ||
d4a72f23 | 2139 | if (!dsl_scan_is_running(scn)) |
428870ff BB |
2140 | return; |
2141 | ||
d683ddbb | 2142 | ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); |
428870ff | 2143 | |
d4a72f23 TC |
2144 | ds_snapshotted_bookmark(ds, &scn->scn_phys.scn_bookmark); |
2145 | ds_snapshotted_bookmark(ds, &scn->scn_phys_cached.scn_bookmark); | |
2146 | ||
2147 | if (scan_ds_queue_contains(scn, ds->ds_object, &mintxg)) { | |
2148 | scan_ds_queue_remove(scn, ds->ds_object); | |
2149 | scan_ds_queue_insert(scn, | |
2150 | dsl_dataset_phys(ds)->ds_prev_snap_obj, mintxg); | |
2151 | } | |
2152 | ||
2153 | if (zap_lookup_int_key(dp->dp_meta_objset, scn->scn_phys.scn_queue_obj, | |
2154 | ds->ds_object, &mintxg) == 0) { | |
428870ff BB |
2155 | VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, |
2156 | scn->scn_phys.scn_queue_obj, ds->ds_object, tx)); | |
2157 | VERIFY(zap_add_int_key(dp->dp_meta_objset, | |
2158 | scn->scn_phys.scn_queue_obj, | |
d683ddbb | 2159 | dsl_dataset_phys(ds)->ds_prev_snap_obj, mintxg, tx) == 0); |
428870ff BB |
2160 | zfs_dbgmsg("snapshotting ds %llu; in queue; " |
2161 | "replacing with %llu", | |
2162 | (u_longlong_t)ds->ds_object, | |
d683ddbb | 2163 | (u_longlong_t)dsl_dataset_phys(ds)->ds_prev_snap_obj); |
428870ff | 2164 | } |
d4a72f23 TC |
2165 | |
2166 | dsl_scan_sync_state(scn, tx, SYNC_CACHED); | |
428870ff BB |
2167 | } |
2168 | ||
d4a72f23 TC |
2169 | static void |
2170 | ds_clone_swapped_bookmark(dsl_dataset_t *ds1, dsl_dataset_t *ds2, | |
2171 | zbookmark_phys_t *scn_bookmark) | |
428870ff | 2172 | { |
d4a72f23 TC |
2173 | if (scn_bookmark->zb_objset == ds1->ds_object) { |
2174 | scn_bookmark->zb_objset = ds2->ds_object; | |
428870ff BB |
2175 | zfs_dbgmsg("clone_swap ds %llu; currently traversing; " |
2176 | "reset zb_objset to %llu", | |
2177 | (u_longlong_t)ds1->ds_object, | |
2178 | (u_longlong_t)ds2->ds_object); | |
d4a72f23 TC |
2179 | } else if (scn_bookmark->zb_objset == ds2->ds_object) { |
2180 | scn_bookmark->zb_objset = ds1->ds_object; | |
428870ff BB |
2181 | zfs_dbgmsg("clone_swap ds %llu; currently traversing; " |
2182 | "reset zb_objset to %llu", | |
2183 | (u_longlong_t)ds2->ds_object, | |
2184 | (u_longlong_t)ds1->ds_object); | |
2185 | } | |
d4a72f23 TC |
2186 | } |
2187 | ||
2188 | /* | |
2189 | * Called when a parent dataset and its clone are swapped. If we were | |
2190 | * currently traversing the dataset, we need to switch to traversing the | |
2191 | * newly promoted parent. | |
2192 | */ | |
2193 | void | |
2194 | dsl_scan_ds_clone_swapped(dsl_dataset_t *ds1, dsl_dataset_t *ds2, dmu_tx_t *tx) | |
2195 | { | |
2196 | dsl_pool_t *dp = ds1->ds_dir->dd_pool; | |
2197 | dsl_scan_t *scn = dp->dp_scan; | |
2198 | uint64_t mintxg; | |
2199 | ||
2200 | if (!dsl_scan_is_running(scn)) | |
2201 | return; | |
2202 | ||
2203 | ds_clone_swapped_bookmark(ds1, ds2, &scn->scn_phys.scn_bookmark); | |
2204 | ds_clone_swapped_bookmark(ds1, ds2, &scn->scn_phys_cached.scn_bookmark); | |
2205 | ||
2206 | if (scan_ds_queue_contains(scn, ds1->ds_object, &mintxg)) { | |
2207 | scan_ds_queue_remove(scn, ds1->ds_object); | |
2208 | scan_ds_queue_insert(scn, ds2->ds_object, mintxg); | |
2209 | } | |
2210 | if (scan_ds_queue_contains(scn, ds2->ds_object, &mintxg)) { | |
2211 | scan_ds_queue_remove(scn, ds2->ds_object); | |
2212 | scan_ds_queue_insert(scn, ds1->ds_object, mintxg); | |
2213 | } | |
428870ff BB |
2214 | |
2215 | if (zap_lookup_int_key(dp->dp_meta_objset, scn->scn_phys.scn_queue_obj, | |
2216 | ds1->ds_object, &mintxg) == 0) { | |
2217 | int err; | |
d683ddbb JG |
2218 | ASSERT3U(mintxg, ==, dsl_dataset_phys(ds1)->ds_prev_snap_txg); |
2219 | ASSERT3U(mintxg, ==, dsl_dataset_phys(ds2)->ds_prev_snap_txg); | |
428870ff BB |
2220 | VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, |
2221 | scn->scn_phys.scn_queue_obj, ds1->ds_object, tx)); | |
2222 | err = zap_add_int_key(dp->dp_meta_objset, | |
2223 | scn->scn_phys.scn_queue_obj, ds2->ds_object, mintxg, tx); | |
2224 | VERIFY(err == 0 || err == EEXIST); | |
2225 | if (err == EEXIST) { | |
2226 | /* Both were there to begin with */ | |
2227 | VERIFY(0 == zap_add_int_key(dp->dp_meta_objset, | |
2228 | scn->scn_phys.scn_queue_obj, | |
2229 | ds1->ds_object, mintxg, tx)); | |
2230 | } | |
2231 | zfs_dbgmsg("clone_swap ds %llu; in queue; " | |
2232 | "replacing with %llu", | |
2233 | (u_longlong_t)ds1->ds_object, | |
2234 | (u_longlong_t)ds2->ds_object); | |
d4a72f23 TC |
2235 | } |
2236 | if (zap_lookup_int_key(dp->dp_meta_objset, scn->scn_phys.scn_queue_obj, | |
2237 | ds2->ds_object, &mintxg) == 0) { | |
d683ddbb JG |
2238 | ASSERT3U(mintxg, ==, dsl_dataset_phys(ds1)->ds_prev_snap_txg); |
2239 | ASSERT3U(mintxg, ==, dsl_dataset_phys(ds2)->ds_prev_snap_txg); | |
428870ff BB |
2240 | VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, |
2241 | scn->scn_phys.scn_queue_obj, ds2->ds_object, tx)); | |
2242 | VERIFY(0 == zap_add_int_key(dp->dp_meta_objset, | |
2243 | scn->scn_phys.scn_queue_obj, ds1->ds_object, mintxg, tx)); | |
2244 | zfs_dbgmsg("clone_swap ds %llu; in queue; " | |
2245 | "replacing with %llu", | |
2246 | (u_longlong_t)ds2->ds_object, | |
2247 | (u_longlong_t)ds1->ds_object); | |
2248 | } | |
2249 | ||
d4a72f23 | 2250 | dsl_scan_sync_state(scn, tx, SYNC_CACHED); |
428870ff BB |
2251 | } |
2252 | ||
428870ff BB |
2253 | /* ARGSUSED */ |
2254 | static int | |
13fe0198 | 2255 | enqueue_clones_cb(dsl_pool_t *dp, dsl_dataset_t *hds, void *arg) |
428870ff | 2256 | { |
d4a72f23 | 2257 | uint64_t originobj = *(uint64_t *)arg; |
428870ff BB |
2258 | dsl_dataset_t *ds; |
2259 | int err; | |
428870ff BB |
2260 | dsl_scan_t *scn = dp->dp_scan; |
2261 | ||
d4a72f23 | 2262 | if (dsl_dir_phys(hds->ds_dir)->dd_origin_obj != originobj) |
13fe0198 MA |
2263 | return (0); |
2264 | ||
2265 | err = dsl_dataset_hold_obj(dp, hds->ds_object, FTAG, &ds); | |
428870ff BB |
2266 | if (err) |
2267 | return (err); | |
2268 | ||
d4a72f23 | 2269 | while (dsl_dataset_phys(ds)->ds_prev_snap_obj != originobj) { |
13fe0198 MA |
2270 | dsl_dataset_t *prev; |
2271 | err = dsl_dataset_hold_obj(dp, | |
d683ddbb | 2272 | dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); |
428870ff | 2273 | |
13fe0198 MA |
2274 | dsl_dataset_rele(ds, FTAG); |
2275 | if (err) | |
2276 | return (err); | |
2277 | ds = prev; | |
428870ff | 2278 | } |
d4a72f23 TC |
2279 | scan_ds_queue_insert(scn, ds->ds_object, |
2280 | dsl_dataset_phys(ds)->ds_prev_snap_txg); | |
428870ff BB |
2281 | dsl_dataset_rele(ds, FTAG); |
2282 | return (0); | |
2283 | } | |
2284 | ||
2285 | static void | |
2286 | dsl_scan_visitds(dsl_scan_t *scn, uint64_t dsobj, dmu_tx_t *tx) | |
2287 | { | |
2288 | dsl_pool_t *dp = scn->scn_dp; | |
2289 | dsl_dataset_t *ds; | |
2290 | ||
2291 | VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); | |
2292 | ||
b77222c8 MA |
2293 | if (scn->scn_phys.scn_cur_min_txg >= |
2294 | scn->scn_phys.scn_max_txg) { | |
2295 | /* | |
2296 | * This can happen if this snapshot was created after the | |
2297 | * scan started, and we already completed a previous snapshot | |
2298 | * that was created after the scan started. This snapshot | |
2299 | * only references blocks with: | |
2300 | * | |
2301 | * birth < our ds_creation_txg | |
2302 | * cur_min_txg is no less than ds_creation_txg. | |
2303 | * We have already visited these blocks. | |
2304 | * or | |
2305 | * birth > scn_max_txg | |
2306 | * The scan requested not to visit these blocks. | |
2307 | * | |
2308 | * Subsequent snapshots (and clones) can reference our | |
2309 | * blocks, or blocks with even higher birth times. | |
2310 | * Therefore we do not need to visit them either, | |
2311 | * so we do not add them to the work queue. | |
2312 | * | |
2313 | * Note that checking for cur_min_txg >= cur_max_txg | |
2314 | * is not sufficient, because in that case we may need to | |
2315 | * visit subsequent snapshots. This happens when min_txg > 0, | |
2316 | * which raises cur_min_txg. In this case we will visit | |
2317 | * this dataset but skip all of its blocks, because the | |
2318 | * rootbp's birth time is < cur_min_txg. Then we will | |
2319 | * add the next snapshots/clones to the work queue. | |
2320 | */ | |
eca7b760 | 2321 | char *dsname = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN, KM_SLEEP); |
b77222c8 MA |
2322 | dsl_dataset_name(ds, dsname); |
2323 | zfs_dbgmsg("scanning dataset %llu (%s) is unnecessary because " | |
2324 | "cur_min_txg (%llu) >= max_txg (%llu)", | |
d4a72f23 TC |
2325 | (longlong_t)dsobj, dsname, |
2326 | (longlong_t)scn->scn_phys.scn_cur_min_txg, | |
2327 | (longlong_t)scn->scn_phys.scn_max_txg); | |
b77222c8 MA |
2328 | kmem_free(dsname, MAXNAMELEN); |
2329 | ||
2330 | goto out; | |
2331 | } | |
2332 | ||
572e2857 | 2333 | /* |
a1d477c2 | 2334 | * Only the ZIL in the head (non-snapshot) is valid. Even though |
572e2857 | 2335 | * snapshots can have ZIL block pointers (which may be the same |
a1d477c2 MA |
2336 | * BP as in the head), they must be ignored. In addition, $ORIGIN |
2337 | * doesn't have a objset (i.e. its ds_bp is a hole) so we don't | |
2338 | * need to look for a ZIL in it either. So we traverse the ZIL here, | |
2339 | * rather than in scan_recurse(), because the regular snapshot | |
2340 | * block-sharing rules don't apply to it. | |
572e2857 | 2341 | */ |
a1d477c2 | 2342 | if (!dsl_dataset_is_snapshot(ds) && |
5e097c67 MA |
2343 | (dp->dp_origin_snap == NULL || |
2344 | ds->ds_dir != dp->dp_origin_snap->ds_dir)) { | |
a1d477c2 MA |
2345 | objset_t *os; |
2346 | if (dmu_objset_from_ds(ds, &os) != 0) { | |
2347 | goto out; | |
2348 | } | |
572e2857 | 2349 | dsl_scan_zil(dp, &os->os_zil_header); |
a1d477c2 | 2350 | } |
572e2857 | 2351 | |
428870ff BB |
2352 | /* |
2353 | * Iterate over the bps in this ds. | |
2354 | */ | |
2355 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
cc9bb3e5 | 2356 | rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); |
d683ddbb | 2357 | dsl_scan_visit_rootbp(scn, ds, &dsl_dataset_phys(ds)->ds_bp, tx); |
cc9bb3e5 | 2358 | rrw_exit(&ds->ds_bp_rwlock, FTAG); |
428870ff | 2359 | |
1c27024e | 2360 | char *dsname = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN, KM_SLEEP); |
428870ff BB |
2361 | dsl_dataset_name(ds, dsname); |
2362 | zfs_dbgmsg("scanned dataset %llu (%s) with min=%llu max=%llu; " | |
0ea05c64 | 2363 | "suspending=%u", |
428870ff BB |
2364 | (longlong_t)dsobj, dsname, |
2365 | (longlong_t)scn->scn_phys.scn_cur_min_txg, | |
2366 | (longlong_t)scn->scn_phys.scn_cur_max_txg, | |
0ea05c64 | 2367 | (int)scn->scn_suspending); |
eca7b760 | 2368 | kmem_free(dsname, ZFS_MAX_DATASET_NAME_LEN); |
428870ff | 2369 | |
0ea05c64 | 2370 | if (scn->scn_suspending) |
428870ff BB |
2371 | goto out; |
2372 | ||
2373 | /* | |
2374 | * We've finished this pass over this dataset. | |
2375 | */ | |
2376 | ||
2377 | /* | |
2378 | * If we did not completely visit this dataset, do another pass. | |
2379 | */ | |
2380 | if (scn->scn_phys.scn_flags & DSF_VISIT_DS_AGAIN) { | |
2381 | zfs_dbgmsg("incomplete pass; visiting again"); | |
2382 | scn->scn_phys.scn_flags &= ~DSF_VISIT_DS_AGAIN; | |
d4a72f23 TC |
2383 | scan_ds_queue_insert(scn, ds->ds_object, |
2384 | scn->scn_phys.scn_cur_max_txg); | |
428870ff BB |
2385 | goto out; |
2386 | } | |
2387 | ||
2388 | /* | |
13a2ff27 | 2389 | * Add descendant datasets to work queue. |
428870ff | 2390 | */ |
d683ddbb | 2391 | if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) { |
d4a72f23 | 2392 | scan_ds_queue_insert(scn, |
d683ddbb | 2393 | dsl_dataset_phys(ds)->ds_next_snap_obj, |
d4a72f23 | 2394 | dsl_dataset_phys(ds)->ds_creation_txg); |
428870ff | 2395 | } |
d683ddbb | 2396 | if (dsl_dataset_phys(ds)->ds_num_children > 1) { |
428870ff | 2397 | boolean_t usenext = B_FALSE; |
d683ddbb | 2398 | if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { |
428870ff BB |
2399 | uint64_t count; |
2400 | /* | |
2401 | * A bug in a previous version of the code could | |
2402 | * cause upgrade_clones_cb() to not set | |
2403 | * ds_next_snap_obj when it should, leading to a | |
2404 | * missing entry. Therefore we can only use the | |
2405 | * next_clones_obj when its count is correct. | |
2406 | */ | |
2407 | int err = zap_count(dp->dp_meta_objset, | |
d683ddbb | 2408 | dsl_dataset_phys(ds)->ds_next_clones_obj, &count); |
428870ff | 2409 | if (err == 0 && |
d683ddbb | 2410 | count == dsl_dataset_phys(ds)->ds_num_children - 1) |
428870ff BB |
2411 | usenext = B_TRUE; |
2412 | } | |
2413 | ||
2414 | if (usenext) { | |
d4a72f23 TC |
2415 | zap_cursor_t zc; |
2416 | zap_attribute_t za; | |
2417 | for (zap_cursor_init(&zc, dp->dp_meta_objset, | |
2418 | dsl_dataset_phys(ds)->ds_next_clones_obj); | |
2419 | zap_cursor_retrieve(&zc, &za) == 0; | |
2420 | (void) zap_cursor_advance(&zc)) { | |
2421 | scan_ds_queue_insert(scn, | |
2422 | zfs_strtonum(za.za_name, NULL), | |
2423 | dsl_dataset_phys(ds)->ds_creation_txg); | |
2424 | } | |
2425 | zap_cursor_fini(&zc); | |
428870ff | 2426 | } else { |
13fe0198 | 2427 | VERIFY0(dmu_objset_find_dp(dp, dp->dp_root_dir_obj, |
d4a72f23 TC |
2428 | enqueue_clones_cb, &ds->ds_object, |
2429 | DS_FIND_CHILDREN)); | |
428870ff BB |
2430 | } |
2431 | } | |
2432 | ||
2433 | out: | |
2434 | dsl_dataset_rele(ds, FTAG); | |
2435 | } | |
2436 | ||
2437 | /* ARGSUSED */ | |
2438 | static int | |
13fe0198 | 2439 | enqueue_cb(dsl_pool_t *dp, dsl_dataset_t *hds, void *arg) |
428870ff | 2440 | { |
428870ff BB |
2441 | dsl_dataset_t *ds; |
2442 | int err; | |
428870ff BB |
2443 | dsl_scan_t *scn = dp->dp_scan; |
2444 | ||
13fe0198 | 2445 | err = dsl_dataset_hold_obj(dp, hds->ds_object, FTAG, &ds); |
428870ff BB |
2446 | if (err) |
2447 | return (err); | |
2448 | ||
d683ddbb | 2449 | while (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { |
428870ff | 2450 | dsl_dataset_t *prev; |
d683ddbb JG |
2451 | err = dsl_dataset_hold_obj(dp, |
2452 | dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); | |
428870ff BB |
2453 | if (err) { |
2454 | dsl_dataset_rele(ds, FTAG); | |
2455 | return (err); | |
2456 | } | |
2457 | ||
2458 | /* | |
2459 | * If this is a clone, we don't need to worry about it for now. | |
2460 | */ | |
d683ddbb | 2461 | if (dsl_dataset_phys(prev)->ds_next_snap_obj != ds->ds_object) { |
428870ff BB |
2462 | dsl_dataset_rele(ds, FTAG); |
2463 | dsl_dataset_rele(prev, FTAG); | |
2464 | return (0); | |
2465 | } | |
2466 | dsl_dataset_rele(ds, FTAG); | |
2467 | ds = prev; | |
2468 | } | |
2469 | ||
d4a72f23 TC |
2470 | scan_ds_queue_insert(scn, ds->ds_object, |
2471 | dsl_dataset_phys(ds)->ds_prev_snap_txg); | |
428870ff BB |
2472 | dsl_dataset_rele(ds, FTAG); |
2473 | return (0); | |
2474 | } | |
2475 | ||
d4a72f23 TC |
2476 | /* ARGSUSED */ |
2477 | void | |
2478 | dsl_scan_ddt_entry(dsl_scan_t *scn, enum zio_checksum checksum, | |
2479 | ddt_entry_t *dde, dmu_tx_t *tx) | |
2480 | { | |
2481 | const ddt_key_t *ddk = &dde->dde_key; | |
2482 | ddt_phys_t *ddp = dde->dde_phys; | |
2483 | blkptr_t bp; | |
2484 | zbookmark_phys_t zb = { 0 }; | |
2485 | int p; | |
2486 | ||
f90a30ad | 2487 | if (!dsl_scan_is_running(scn)) |
d4a72f23 TC |
2488 | return; |
2489 | ||
5e0bd0ae TC |
2490 | /* |
2491 | * This function is special because it is the only thing | |
2492 | * that can add scan_io_t's to the vdev scan queues from | |
2493 | * outside dsl_scan_sync(). For the most part this is ok | |
2494 | * as long as it is called from within syncing context. | |
2495 | * However, dsl_scan_sync() expects that no new sio's will | |
2496 | * be added between when all the work for a scan is done | |
2497 | * and the next txg when the scan is actually marked as | |
2498 | * completed. This check ensures we do not issue new sio's | |
2499 | * during this period. | |
2500 | */ | |
2501 | if (scn->scn_done_txg != 0) | |
2502 | return; | |
2503 | ||
d4a72f23 TC |
2504 | for (p = 0; p < DDT_PHYS_TYPES; p++, ddp++) { |
2505 | if (ddp->ddp_phys_birth == 0 || | |
2506 | ddp->ddp_phys_birth > scn->scn_phys.scn_max_txg) | |
2507 | continue; | |
2508 | ddt_bp_create(checksum, ddk, ddp, &bp); | |
2509 | ||
2510 | scn->scn_visited_this_txg++; | |
2511 | scan_funcs[scn->scn_phys.scn_func](scn->scn_dp, &bp, &zb); | |
2512 | } | |
2513 | } | |
2514 | ||
428870ff BB |
2515 | /* |
2516 | * Scrub/dedup interaction. | |
2517 | * | |
2518 | * If there are N references to a deduped block, we don't want to scrub it | |
2519 | * N times -- ideally, we should scrub it exactly once. | |
2520 | * | |
2521 | * We leverage the fact that the dde's replication class (enum ddt_class) | |
2522 | * is ordered from highest replication class (DDT_CLASS_DITTO) to lowest | |
2523 | * (DDT_CLASS_UNIQUE) so that we may walk the DDT in that order. | |
2524 | * | |
2525 | * To prevent excess scrubbing, the scrub begins by walking the DDT | |
2526 | * to find all blocks with refcnt > 1, and scrubs each of these once. | |
2527 | * Since there are two replication classes which contain blocks with | |
2528 | * refcnt > 1, we scrub the highest replication class (DDT_CLASS_DITTO) first. | |
2529 | * Finally the top-down scrub begins, only visiting blocks with refcnt == 1. | |
2530 | * | |
2531 | * There would be nothing more to say if a block's refcnt couldn't change | |
2532 | * during a scrub, but of course it can so we must account for changes | |
2533 | * in a block's replication class. | |
2534 | * | |
2535 | * Here's an example of what can occur: | |
2536 | * | |
2537 | * If a block has refcnt > 1 during the DDT scrub phase, but has refcnt == 1 | |
2538 | * when visited during the top-down scrub phase, it will be scrubbed twice. | |
2539 | * This negates our scrub optimization, but is otherwise harmless. | |
2540 | * | |
2541 | * If a block has refcnt == 1 during the DDT scrub phase, but has refcnt > 1 | |
2542 | * on each visit during the top-down scrub phase, it will never be scrubbed. | |
2543 | * To catch this, ddt_sync_entry() notifies the scrub code whenever a block's | |
2544 | * reference class transitions to a higher level (i.e DDT_CLASS_UNIQUE to | |
2545 | * DDT_CLASS_DUPLICATE); if it transitions from refcnt == 1 to refcnt > 1 | |
2546 | * while a scrub is in progress, it scrubs the block right then. | |
2547 | */ | |
2548 | static void | |
2549 | dsl_scan_ddt(dsl_scan_t *scn, dmu_tx_t *tx) | |
2550 | { | |
2551 | ddt_bookmark_t *ddb = &scn->scn_phys.scn_ddt_bookmark; | |
2598c001 | 2552 | ddt_entry_t dde; |
428870ff BB |
2553 | int error; |
2554 | uint64_t n = 0; | |
2555 | ||
2598c001 BB |
2556 | bzero(&dde, sizeof (ddt_entry_t)); |
2557 | ||
428870ff BB |
2558 | while ((error = ddt_walk(scn->scn_dp->dp_spa, ddb, &dde)) == 0) { |
2559 | ddt_t *ddt; | |
2560 | ||
2561 | if (ddb->ddb_class > scn->scn_phys.scn_ddt_class_max) | |
2562 | break; | |
2563 | dprintf("visiting ddb=%llu/%llu/%llu/%llx\n", | |
2564 | (longlong_t)ddb->ddb_class, | |
2565 | (longlong_t)ddb->ddb_type, | |
2566 | (longlong_t)ddb->ddb_checksum, | |
2567 | (longlong_t)ddb->ddb_cursor); | |
2568 | ||
2569 | /* There should be no pending changes to the dedup table */ | |
2570 | ddt = scn->scn_dp->dp_spa->spa_ddt[ddb->ddb_checksum]; | |
2571 | ASSERT(avl_first(&ddt->ddt_tree) == NULL); | |
2572 | ||
2573 | dsl_scan_ddt_entry(scn, ddb->ddb_checksum, &dde, tx); | |
2574 | n++; | |
2575 | ||
0ea05c64 | 2576 | if (dsl_scan_check_suspend(scn, NULL)) |
428870ff BB |
2577 | break; |
2578 | } | |
2579 | ||
0ea05c64 AP |
2580 | zfs_dbgmsg("scanned %llu ddt entries with class_max = %u; " |
2581 | "suspending=%u", (longlong_t)n, | |
2582 | (int)scn->scn_phys.scn_ddt_class_max, (int)scn->scn_suspending); | |
428870ff BB |
2583 | |
2584 | ASSERT(error == 0 || error == ENOENT); | |
2585 | ASSERT(error != ENOENT || | |
2586 | ddb->ddb_class > scn->scn_phys.scn_ddt_class_max); | |
2587 | } | |
2588 | ||
d4a72f23 TC |
2589 | static uint64_t |
2590 | dsl_scan_ds_maxtxg(dsl_dataset_t *ds) | |
428870ff | 2591 | { |
d4a72f23 TC |
2592 | uint64_t smt = ds->ds_dir->dd_pool->dp_scan->scn_phys.scn_max_txg; |
2593 | if (ds->ds_is_snapshot) | |
2594 | return (MIN(smt, dsl_dataset_phys(ds)->ds_creation_txg)); | |
2595 | return (smt); | |
428870ff BB |
2596 | } |
2597 | ||
2598 | static void | |
2599 | dsl_scan_visit(dsl_scan_t *scn, dmu_tx_t *tx) | |
2600 | { | |
d4a72f23 | 2601 | scan_ds_t *sds; |
428870ff | 2602 | dsl_pool_t *dp = scn->scn_dp; |
428870ff BB |
2603 | |
2604 | if (scn->scn_phys.scn_ddt_bookmark.ddb_class <= | |
2605 | scn->scn_phys.scn_ddt_class_max) { | |
2606 | scn->scn_phys.scn_cur_min_txg = scn->scn_phys.scn_min_txg; | |
2607 | scn->scn_phys.scn_cur_max_txg = scn->scn_phys.scn_max_txg; | |
2608 | dsl_scan_ddt(scn, tx); | |
0ea05c64 | 2609 | if (scn->scn_suspending) |
428870ff BB |
2610 | return; |
2611 | } | |
2612 | ||
2613 | if (scn->scn_phys.scn_bookmark.zb_objset == DMU_META_OBJSET) { | |
2614 | /* First do the MOS & ORIGIN */ | |
2615 | ||
2616 | scn->scn_phys.scn_cur_min_txg = scn->scn_phys.scn_min_txg; | |
2617 | scn->scn_phys.scn_cur_max_txg = scn->scn_phys.scn_max_txg; | |
2618 | dsl_scan_visit_rootbp(scn, NULL, | |
2619 | &dp->dp_meta_rootbp, tx); | |
2620 | spa_set_rootblkptr(dp->dp_spa, &dp->dp_meta_rootbp); | |
0ea05c64 | 2621 | if (scn->scn_suspending) |
428870ff BB |
2622 | return; |
2623 | ||
2624 | if (spa_version(dp->dp_spa) < SPA_VERSION_DSL_SCRUB) { | |
13fe0198 | 2625 | VERIFY0(dmu_objset_find_dp(dp, dp->dp_root_dir_obj, |
d4a72f23 | 2626 | enqueue_cb, NULL, DS_FIND_CHILDREN)); |
428870ff BB |
2627 | } else { |
2628 | dsl_scan_visitds(scn, | |
2629 | dp->dp_origin_snap->ds_object, tx); | |
2630 | } | |
0ea05c64 | 2631 | ASSERT(!scn->scn_suspending); |
428870ff BB |
2632 | } else if (scn->scn_phys.scn_bookmark.zb_objset != |
2633 | ZB_DESTROYED_OBJSET) { | |
d4a72f23 | 2634 | uint64_t dsobj = scn->scn_phys.scn_bookmark.zb_objset; |
428870ff | 2635 | /* |
d4a72f23 | 2636 | * If we were suspended, continue from here. Note if the |
0ea05c64 | 2637 | * ds we were suspended on was deleted, the zb_objset may |
428870ff BB |
2638 | * be -1, so we will skip this and find a new objset |
2639 | * below. | |
2640 | */ | |
d4a72f23 | 2641 | dsl_scan_visitds(scn, dsobj, tx); |
0ea05c64 | 2642 | if (scn->scn_suspending) |
428870ff BB |
2643 | return; |
2644 | } | |
2645 | ||
2646 | /* | |
d4a72f23 | 2647 | * In case we suspended right at the end of the ds, zero the |
428870ff BB |
2648 | * bookmark so we don't think that we're still trying to resume. |
2649 | */ | |
5dbd68a3 | 2650 | bzero(&scn->scn_phys.scn_bookmark, sizeof (zbookmark_phys_t)); |
428870ff | 2651 | |
d4a72f23 TC |
2652 | /* |
2653 | * Keep pulling things out of the dataset avl queue. Updates to the | |
2654 | * persistent zap-object-as-queue happen only at checkpoints. | |
2655 | */ | |
2656 | while ((sds = avl_first(&scn->scn_queue)) != NULL) { | |
428870ff | 2657 | dsl_dataset_t *ds; |
d4a72f23 TC |
2658 | uint64_t dsobj = sds->sds_dsobj; |
2659 | uint64_t txg = sds->sds_txg; | |
428870ff | 2660 | |
d4a72f23 TC |
2661 | /* dequeue and free the ds from the queue */ |
2662 | scan_ds_queue_remove(scn, dsobj); | |
2663 | sds = NULL; | |
428870ff | 2664 | |
d4a72f23 | 2665 | /* set up min / max txg */ |
428870ff | 2666 | VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); |
d4a72f23 | 2667 | if (txg != 0) { |
428870ff | 2668 | scn->scn_phys.scn_cur_min_txg = |
d4a72f23 | 2669 | MAX(scn->scn_phys.scn_min_txg, txg); |
428870ff BB |
2670 | } else { |
2671 | scn->scn_phys.scn_cur_min_txg = | |
2672 | MAX(scn->scn_phys.scn_min_txg, | |
d683ddbb | 2673 | dsl_dataset_phys(ds)->ds_prev_snap_txg); |
428870ff BB |
2674 | } |
2675 | scn->scn_phys.scn_cur_max_txg = dsl_scan_ds_maxtxg(ds); | |
2676 | dsl_dataset_rele(ds, FTAG); | |
2677 | ||
2678 | dsl_scan_visitds(scn, dsobj, tx); | |
0ea05c64 | 2679 | if (scn->scn_suspending) |
d4a72f23 | 2680 | return; |
428870ff | 2681 | } |
d4a72f23 TC |
2682 | |
2683 | /* No more objsets to fetch, we're done */ | |
2684 | scn->scn_phys.scn_bookmark.zb_objset = ZB_DESTROYED_OBJSET; | |
2685 | ASSERT0(scn->scn_suspending); | |
2686 | } | |
2687 | ||
2688 | static uint64_t | |
2689 | dsl_scan_count_leaves(vdev_t *vd) | |
2690 | { | |
2691 | uint64_t i, leaves = 0; | |
2692 | ||
2693 | /* we only count leaves that belong to the main pool and are readable */ | |
2694 | if (vd->vdev_islog || vd->vdev_isspare || | |
2695 | vd->vdev_isl2cache || !vdev_readable(vd)) | |
2696 | return (0); | |
2697 | ||
2698 | if (vd->vdev_ops->vdev_op_leaf) | |
2699 | return (1); | |
2700 | ||
2701 | for (i = 0; i < vd->vdev_children; i++) { | |
2702 | leaves += dsl_scan_count_leaves(vd->vdev_child[i]); | |
2703 | } | |
2704 | ||
2705 | return (leaves); | |
2706 | } | |
2707 | ||
2708 | static void | |
2709 | scan_io_queues_update_zio_stats(dsl_scan_io_queue_t *q, const blkptr_t *bp) | |
2710 | { | |
2711 | int i; | |
2712 | uint64_t cur_size = 0; | |
2713 | ||
2714 | for (i = 0; i < BP_GET_NDVAS(bp); i++) { | |
2715 | cur_size += DVA_GET_ASIZE(&bp->blk_dva[i]); | |
2716 | } | |
2717 | ||
2718 | q->q_total_zio_size_this_txg += cur_size; | |
2719 | q->q_zios_this_txg++; | |
2720 | } | |
2721 | ||
2722 | static void | |
2723 | scan_io_queues_update_seg_stats(dsl_scan_io_queue_t *q, uint64_t start, | |
2724 | uint64_t end) | |
2725 | { | |
2726 | q->q_total_seg_size_this_txg += end - start; | |
2727 | q->q_segs_this_txg++; | |
2728 | } | |
2729 | ||
2730 | static boolean_t | |
2731 | scan_io_queue_check_suspend(dsl_scan_t *scn) | |
2732 | { | |
2733 | /* See comment in dsl_scan_check_suspend() */ | |
2734 | uint64_t curr_time_ns = gethrtime(); | |
2735 | uint64_t scan_time_ns = curr_time_ns - scn->scn_sync_start_time; | |
2736 | uint64_t sync_time_ns = curr_time_ns - | |
2737 | scn->scn_dp->dp_spa->spa_sync_starttime; | |
2738 | int dirty_pct = scn->scn_dp->dp_dirty_total * 100 / zfs_dirty_data_max; | |
2739 | int mintime = (scn->scn_phys.scn_func == POOL_SCAN_RESILVER) ? | |
2740 | zfs_resilver_min_time_ms : zfs_scrub_min_time_ms; | |
2741 | ||
2742 | return ((NSEC2MSEC(scan_time_ns) > mintime && | |
2743 | (dirty_pct >= zfs_vdev_async_write_active_min_dirty_percent || | |
2744 | txg_sync_waiting(scn->scn_dp) || | |
2745 | NSEC2SEC(sync_time_ns) >= zfs_txg_timeout)) || | |
2746 | spa_shutting_down(scn->scn_dp->dp_spa)); | |
2747 | } | |
2748 | ||
2749 | /* | |
13a2ff27 | 2750 | * Given a list of scan_io_t's in io_list, this issues the I/Os out to |
d4a72f23 TC |
2751 | * disk. This consumes the io_list and frees the scan_io_t's. This is |
2752 | * called when emptying queues, either when we're up against the memory | |
2753 | * limit or when we have finished scanning. Returns B_TRUE if we stopped | |
13a2ff27 | 2754 | * processing the list before we finished. Any sios that were not issued |
d4a72f23 TC |
2755 | * will remain in the io_list. |
2756 | */ | |
2757 | static boolean_t | |
2758 | scan_io_queue_issue(dsl_scan_io_queue_t *queue, list_t *io_list) | |
2759 | { | |
2760 | dsl_scan_t *scn = queue->q_scn; | |
2761 | scan_io_t *sio; | |
2762 | int64_t bytes_issued = 0; | |
2763 | boolean_t suspended = B_FALSE; | |
2764 | ||
2765 | while ((sio = list_head(io_list)) != NULL) { | |
2766 | blkptr_t bp; | |
2767 | ||
2768 | if (scan_io_queue_check_suspend(scn)) { | |
2769 | suspended = B_TRUE; | |
2770 | break; | |
2771 | } | |
2772 | ||
ab7615d9 TC |
2773 | sio2bp(sio, &bp); |
2774 | bytes_issued += SIO_GET_ASIZE(sio); | |
d4a72f23 TC |
2775 | scan_exec_io(scn->scn_dp, &bp, sio->sio_flags, |
2776 | &sio->sio_zb, queue); | |
2777 | (void) list_remove_head(io_list); | |
2778 | scan_io_queues_update_zio_stats(queue, &bp); | |
ab7615d9 | 2779 | sio_free(sio); |
d4a72f23 TC |
2780 | } |
2781 | ||
2782 | atomic_add_64(&scn->scn_bytes_pending, -bytes_issued); | |
2783 | ||
2784 | return (suspended); | |
2785 | } | |
2786 | ||
2787 | /* | |
2788 | * This function removes sios from an IO queue which reside within a given | |
2789 | * range_seg_t and inserts them (in offset order) into a list. Note that | |
2790 | * we only ever return a maximum of 32 sios at once. If there are more sios | |
2791 | * to process within this segment that did not make it onto the list we | |
2792 | * return B_TRUE and otherwise B_FALSE. | |
2793 | */ | |
2794 | static boolean_t | |
2795 | scan_io_queue_gather(dsl_scan_io_queue_t *queue, range_seg_t *rs, list_t *list) | |
2796 | { | |
ab7615d9 | 2797 | scan_io_t *srch_sio, *sio, *next_sio; |
d4a72f23 TC |
2798 | avl_index_t idx; |
2799 | uint_t num_sios = 0; | |
2800 | int64_t bytes_issued = 0; | |
2801 | ||
2802 | ASSERT(rs != NULL); | |
2803 | ASSERT(MUTEX_HELD(&queue->q_vd->vdev_scan_io_queue_lock)); | |
2804 | ||
ab7615d9 TC |
2805 | srch_sio = sio_alloc(1); |
2806 | srch_sio->sio_nr_dvas = 1; | |
2807 | SIO_SET_OFFSET(srch_sio, rs->rs_start); | |
d4a72f23 TC |
2808 | |
2809 | /* | |
2810 | * The exact start of the extent might not contain any matching zios, | |
2811 | * so if that's the case, examine the next one in the tree. | |
2812 | */ | |
ab7615d9 TC |
2813 | sio = avl_find(&queue->q_sios_by_addr, srch_sio, &idx); |
2814 | sio_free(srch_sio); | |
2815 | ||
d4a72f23 TC |
2816 | if (sio == NULL) |
2817 | sio = avl_nearest(&queue->q_sios_by_addr, idx, AVL_AFTER); | |
2818 | ||
ab7615d9 TC |
2819 | while (sio != NULL && |
2820 | SIO_GET_OFFSET(sio) < rs->rs_end && num_sios <= 32) { | |
2821 | ASSERT3U(SIO_GET_OFFSET(sio), >=, rs->rs_start); | |
2822 | ASSERT3U(SIO_GET_END_OFFSET(sio), <=, rs->rs_end); | |
d4a72f23 TC |
2823 | |
2824 | next_sio = AVL_NEXT(&queue->q_sios_by_addr, sio); | |
2825 | avl_remove(&queue->q_sios_by_addr, sio); | |
ab7615d9 | 2826 | queue->q_sio_memused -= SIO_GET_MUSED(sio); |
d4a72f23 | 2827 | |
ab7615d9 | 2828 | bytes_issued += SIO_GET_ASIZE(sio); |
d4a72f23 TC |
2829 | num_sios++; |
2830 | list_insert_tail(list, sio); | |
2831 | sio = next_sio; | |
2832 | } | |
2833 | ||
2834 | /* | |
2835 | * We limit the number of sios we process at once to 32 to avoid | |
2836 | * biting off more than we can chew. If we didn't take everything | |
2837 | * in the segment we update it to reflect the work we were able to | |
2838 | * complete. Otherwise, we remove it from the range tree entirely. | |
2839 | */ | |
ab7615d9 | 2840 | if (sio != NULL && SIO_GET_OFFSET(sio) < rs->rs_end) { |
d4a72f23 TC |
2841 | range_tree_adjust_fill(queue->q_exts_by_addr, rs, |
2842 | -bytes_issued); | |
2843 | range_tree_resize_segment(queue->q_exts_by_addr, rs, | |
ab7615d9 | 2844 | SIO_GET_OFFSET(sio), rs->rs_end - SIO_GET_OFFSET(sio)); |
d4a72f23 TC |
2845 | |
2846 | return (B_TRUE); | |
2847 | } else { | |
2848 | range_tree_remove(queue->q_exts_by_addr, rs->rs_start, | |
2849 | rs->rs_end - rs->rs_start); | |
2850 | return (B_FALSE); | |
2851 | } | |
2852 | } | |
2853 | ||
2854 | /* | |
2855 | * This is called from the queue emptying thread and selects the next | |
13a2ff27 | 2856 | * extent from which we are to issue I/Os. The behavior of this function |
d4a72f23 TC |
2857 | * depends on the state of the scan, the current memory consumption and |
2858 | * whether or not we are performing a scan shutdown. | |
2859 | * 1) We select extents in an elevator algorithm (LBA-order) if the scan | |
2860 | * needs to perform a checkpoint | |
2861 | * 2) We select the largest available extent if we are up against the | |
2862 | * memory limit. | |
2863 | * 3) Otherwise we don't select any extents. | |
2864 | */ | |
2865 | static range_seg_t * | |
2866 | scan_io_queue_fetch_ext(dsl_scan_io_queue_t *queue) | |
2867 | { | |
2868 | dsl_scan_t *scn = queue->q_scn; | |
2869 | ||
2870 | ASSERT(MUTEX_HELD(&queue->q_vd->vdev_scan_io_queue_lock)); | |
2871 | ASSERT(scn->scn_is_sorted); | |
2872 | ||
2873 | /* handle tunable overrides */ | |
2874 | if (scn->scn_checkpointing || scn->scn_clearing) { | |
2875 | if (zfs_scan_issue_strategy == 1) { | |
2876 | return (range_tree_first(queue->q_exts_by_addr)); | |
2877 | } else if (zfs_scan_issue_strategy == 2) { | |
2878 | return (avl_first(&queue->q_exts_by_size)); | |
2879 | } | |
2880 | } | |
2881 | ||
2882 | /* | |
2883 | * During normal clearing, we want to issue our largest segments | |
2884 | * first, keeping IO as sequential as possible, and leaving the | |
2885 | * smaller extents for later with the hope that they might eventually | |
2886 | * grow to larger sequential segments. However, when the scan is | |
2887 | * checkpointing, no new extents will be added to the sorting queue, | |
2888 | * so the way we are sorted now is as good as it will ever get. | |
2889 | * In this case, we instead switch to issuing extents in LBA order. | |
2890 | */ | |
2891 | if (scn->scn_checkpointing) { | |
2892 | return (range_tree_first(queue->q_exts_by_addr)); | |
2893 | } else if (scn->scn_clearing) { | |
2894 | return (avl_first(&queue->q_exts_by_size)); | |
2895 | } else { | |
2896 | return (NULL); | |
2897 | } | |
2898 | } | |
2899 | ||
2900 | static void | |
2901 | scan_io_queues_run_one(void *arg) | |
2902 | { | |
2903 | dsl_scan_io_queue_t *queue = arg; | |
2904 | kmutex_t *q_lock = &queue->q_vd->vdev_scan_io_queue_lock; | |
2905 | boolean_t suspended = B_FALSE; | |
2906 | range_seg_t *rs = NULL; | |
2907 | scan_io_t *sio = NULL; | |
2908 | list_t sio_list; | |
2909 | uint64_t bytes_per_leaf = zfs_scan_vdev_limit; | |
2910 | uint64_t nr_leaves = dsl_scan_count_leaves(queue->q_vd); | |
2911 | ||
2912 | ASSERT(queue->q_scn->scn_is_sorted); | |
2913 | ||
2914 | list_create(&sio_list, sizeof (scan_io_t), | |
2915 | offsetof(scan_io_t, sio_nodes.sio_list_node)); | |
2916 | mutex_enter(q_lock); | |
2917 | ||
2918 | /* calculate maximum in-flight bytes for this txg (min 1MB) */ | |
2919 | queue->q_maxinflight_bytes = | |
2920 | MAX(nr_leaves * bytes_per_leaf, 1ULL << 20); | |
2921 | ||
2922 | /* reset per-queue scan statistics for this txg */ | |
2923 | queue->q_total_seg_size_this_txg = 0; | |
2924 | queue->q_segs_this_txg = 0; | |
2925 | queue->q_total_zio_size_this_txg = 0; | |
2926 | queue->q_zios_this_txg = 0; | |
2927 | ||
2928 | /* loop until we run out of time or sios */ | |
2929 | while ((rs = scan_io_queue_fetch_ext(queue)) != NULL) { | |
2930 | uint64_t seg_start = 0, seg_end = 0; | |
2931 | boolean_t more_left = B_TRUE; | |
2932 | ||
2933 | ASSERT(list_is_empty(&sio_list)); | |
2934 | ||
2935 | /* loop while we still have sios left to process in this rs */ | |
2936 | while (more_left) { | |
2937 | scan_io_t *first_sio, *last_sio; | |
2938 | ||
2939 | /* | |
2940 | * We have selected which extent needs to be | |
2941 | * processed next. Gather up the corresponding sios. | |
2942 | */ | |
2943 | more_left = scan_io_queue_gather(queue, rs, &sio_list); | |
2944 | ASSERT(!list_is_empty(&sio_list)); | |
2945 | first_sio = list_head(&sio_list); | |
2946 | last_sio = list_tail(&sio_list); | |
2947 | ||
ab7615d9 | 2948 | seg_end = SIO_GET_END_OFFSET(last_sio); |
d4a72f23 | 2949 | if (seg_start == 0) |
ab7615d9 | 2950 | seg_start = SIO_GET_OFFSET(first_sio); |
d4a72f23 TC |
2951 | |
2952 | /* | |
2953 | * Issuing sios can take a long time so drop the | |
2954 | * queue lock. The sio queue won't be updated by | |
2955 | * other threads since we're in syncing context so | |
2956 | * we can be sure that our trees will remain exactly | |
2957 | * as we left them. | |
2958 | */ | |
2959 | mutex_exit(q_lock); | |
2960 | suspended = scan_io_queue_issue(queue, &sio_list); | |
2961 | mutex_enter(q_lock); | |
2962 | ||
2963 | if (suspended) | |
2964 | break; | |
2965 | } | |
2966 | ||
2967 | /* update statistics for debugging purposes */ | |
2968 | scan_io_queues_update_seg_stats(queue, seg_start, seg_end); | |
2969 | ||
2970 | if (suspended) | |
2971 | break; | |
2972 | } | |
2973 | ||
2974 | /* | |
2975 | * If we were suspended in the middle of processing, | |
2976 | * requeue any unfinished sios and exit. | |
2977 | */ | |
2978 | while ((sio = list_head(&sio_list)) != NULL) { | |
2979 | list_remove(&sio_list, sio); | |
2980 | scan_io_queue_insert_impl(queue, sio); | |
2981 | } | |
2982 | ||
2983 | mutex_exit(q_lock); | |
2984 | list_destroy(&sio_list); | |
2985 | } | |
2986 | ||
2987 | /* | |
2988 | * Performs an emptying run on all scan queues in the pool. This just | |
2989 | * punches out one thread per top-level vdev, each of which processes | |
2990 | * only that vdev's scan queue. We can parallelize the I/O here because | |
13a2ff27 | 2991 | * we know that each queue's I/Os only affect its own top-level vdev. |
d4a72f23 TC |
2992 | * |
2993 | * This function waits for the queue runs to complete, and must be | |
2994 | * called from dsl_scan_sync (or in general, syncing context). | |
2995 | */ | |
2996 | static void | |
2997 | scan_io_queues_run(dsl_scan_t *scn) | |
2998 | { | |
2999 | spa_t *spa = scn->scn_dp->dp_spa; | |
3000 | ||
3001 | ASSERT(scn->scn_is_sorted); | |
3002 | ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); | |
3003 | ||
3004 | if (scn->scn_bytes_pending == 0) | |
3005 | return; | |
3006 | ||
3007 | if (scn->scn_taskq == NULL) { | |
3008 | int nthreads = spa->spa_root_vdev->vdev_children; | |
3009 | ||
3010 | /* | |
3011 | * We need to make this taskq *always* execute as many | |
3012 | * threads in parallel as we have top-level vdevs and no | |
3013 | * less, otherwise strange serialization of the calls to | |
3014 | * scan_io_queues_run_one can occur during spa_sync runs | |
3015 | * and that significantly impacts performance. | |
3016 | */ | |
3017 | scn->scn_taskq = taskq_create("dsl_scan_iss", nthreads, | |
3018 | minclsyspri, nthreads, nthreads, TASKQ_PREPOPULATE); | |
3019 | } | |
3020 | ||
3021 | for (uint64_t i = 0; i < spa->spa_root_vdev->vdev_children; i++) { | |
3022 | vdev_t *vd = spa->spa_root_vdev->vdev_child[i]; | |
3023 | ||
3024 | mutex_enter(&vd->vdev_scan_io_queue_lock); | |
3025 | if (vd->vdev_scan_io_queue != NULL) { | |
3026 | VERIFY(taskq_dispatch(scn->scn_taskq, | |
3027 | scan_io_queues_run_one, vd->vdev_scan_io_queue, | |
3028 | TQ_SLEEP) != TASKQID_INVALID); | |
3029 | } | |
3030 | mutex_exit(&vd->vdev_scan_io_queue_lock); | |
3031 | } | |
3032 | ||
3033 | /* | |
13a2ff27 | 3034 | * Wait for the queues to finish issuing their IOs for this run |
d4a72f23 TC |
3035 | * before we return. There may still be IOs in flight at this |
3036 | * point. | |
3037 | */ | |
3038 | taskq_wait(scn->scn_taskq); | |
428870ff BB |
3039 | } |
3040 | ||
9ae529ec | 3041 | static boolean_t |
a1d477c2 | 3042 | dsl_scan_async_block_should_pause(dsl_scan_t *scn) |
428870ff | 3043 | { |
428870ff BB |
3044 | uint64_t elapsed_nanosecs; |
3045 | ||
78e2739d MA |
3046 | if (zfs_recover) |
3047 | return (B_FALSE); | |
3048 | ||
a3c98d57 TJ |
3049 | if (zfs_async_block_max_blocks != 0 && |
3050 | scn->scn_visited_this_txg >= zfs_async_block_max_blocks) { | |
36283ca2 | 3051 | return (B_TRUE); |
a3c98d57 | 3052 | } |
36283ca2 | 3053 | |
428870ff | 3054 | elapsed_nanosecs = gethrtime() - scn->scn_sync_start_time; |
9ae529ec | 3055 | return (elapsed_nanosecs / NANOSEC > zfs_txg_timeout || |
a1d477c2 | 3056 | (NSEC2MSEC(elapsed_nanosecs) > scn->scn_async_block_min_time_ms && |
428870ff | 3057 | txg_sync_waiting(scn->scn_dp)) || |
9ae529ec CS |
3058 | spa_shutting_down(scn->scn_dp->dp_spa)); |
3059 | } | |
3060 | ||
3061 | static int | |
3062 | dsl_scan_free_block_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) | |
3063 | { | |
3064 | dsl_scan_t *scn = arg; | |
3065 | ||
3066 | if (!scn->scn_is_bptree || | |
3067 | (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_OBJSET)) { | |
a1d477c2 | 3068 | if (dsl_scan_async_block_should_pause(scn)) |
2e528b49 | 3069 | return (SET_ERROR(ERESTART)); |
9ae529ec | 3070 | } |
428870ff BB |
3071 | |
3072 | zio_nowait(zio_free_sync(scn->scn_zio_root, scn->scn_dp->dp_spa, | |
3073 | dmu_tx_get_txg(tx), bp, 0)); | |
3074 | dsl_dir_diduse_space(tx->tx_pool->dp_free_dir, DD_USED_HEAD, | |
3075 | -bp_get_dsize_sync(scn->scn_dp->dp_spa, bp), | |
3076 | -BP_GET_PSIZE(bp), -BP_GET_UCSIZE(bp), tx); | |
3077 | scn->scn_visited_this_txg++; | |
3078 | return (0); | |
3079 | } | |
3080 | ||
d4a72f23 TC |
3081 | static void |
3082 | dsl_scan_update_stats(dsl_scan_t *scn) | |
3083 | { | |
3084 | spa_t *spa = scn->scn_dp->dp_spa; | |
3085 | uint64_t i; | |
3086 | uint64_t seg_size_total = 0, zio_size_total = 0; | |
3087 | uint64_t seg_count_total = 0, zio_count_total = 0; | |
3088 | ||
3089 | for (i = 0; i < spa->spa_root_vdev->vdev_children; i++) { | |
3090 | vdev_t *vd = spa->spa_root_vdev->vdev_child[i]; | |
3091 | dsl_scan_io_queue_t *queue = vd->vdev_scan_io_queue; | |
3092 | ||
3093 | if (queue == NULL) | |
3094 | continue; | |
3095 | ||
3096 | seg_size_total += queue->q_total_seg_size_this_txg; | |
3097 | zio_size_total += queue->q_total_zio_size_this_txg; | |
3098 | seg_count_total += queue->q_segs_this_txg; | |
3099 | zio_count_total += queue->q_zios_this_txg; | |
3100 | } | |
3101 | ||
3102 | if (seg_count_total == 0 || zio_count_total == 0) { | |
3103 | scn->scn_avg_seg_size_this_txg = 0; | |
3104 | scn->scn_avg_zio_size_this_txg = 0; | |
3105 | scn->scn_segs_this_txg = 0; | |
3106 | scn->scn_zios_this_txg = 0; | |
3107 | return; | |
3108 | } | |
3109 | ||
3110 | scn->scn_avg_seg_size_this_txg = seg_size_total / seg_count_total; | |
3111 | scn->scn_avg_zio_size_this_txg = zio_size_total / zio_count_total; | |
3112 | scn->scn_segs_this_txg = seg_count_total; | |
3113 | scn->scn_zios_this_txg = zio_count_total; | |
3114 | } | |
3115 | ||
a1d477c2 | 3116 | static int |
37f03da8 SH |
3117 | bpobj_dsl_scan_free_block_cb(void *arg, const blkptr_t *bp, boolean_t bp_freed, |
3118 | dmu_tx_t *tx) | |
a1d477c2 | 3119 | { |
37f03da8 SH |
3120 | ASSERT(!bp_freed); |
3121 | return (dsl_scan_free_block_cb(arg, bp, tx)); | |
3122 | } | |
3123 | ||
3124 | static int | |
3125 | dsl_scan_obsolete_block_cb(void *arg, const blkptr_t *bp, boolean_t bp_freed, | |
3126 | dmu_tx_t *tx) | |
3127 | { | |
3128 | ASSERT(!bp_freed); | |
a1d477c2 MA |
3129 | dsl_scan_t *scn = arg; |
3130 | const dva_t *dva = &bp->blk_dva[0]; | |
3131 | ||
3132 | if (dsl_scan_async_block_should_pause(scn)) | |
3133 | return (SET_ERROR(ERESTART)); | |
3134 | ||
3135 | spa_vdev_indirect_mark_obsolete(scn->scn_dp->dp_spa, | |
3136 | DVA_GET_VDEV(dva), DVA_GET_OFFSET(dva), | |
3137 | DVA_GET_ASIZE(dva), tx); | |
3138 | scn->scn_visited_this_txg++; | |
3139 | return (0); | |
3140 | } | |
3141 | ||
428870ff BB |
3142 | boolean_t |
3143 | dsl_scan_active(dsl_scan_t *scn) | |
3144 | { | |
3145 | spa_t *spa = scn->scn_dp->dp_spa; | |
3146 | uint64_t used = 0, comp, uncomp; | |
37f03da8 | 3147 | boolean_t clones_left; |
428870ff BB |
3148 | |
3149 | if (spa->spa_load_state != SPA_LOAD_NONE) | |
3150 | return (B_FALSE); | |
3151 | if (spa_shutting_down(spa)) | |
3152 | return (B_FALSE); | |
d4a72f23 | 3153 | if ((dsl_scan_is_running(scn) && !dsl_scan_is_paused_scrub(scn)) || |
fbeddd60 | 3154 | (scn->scn_async_destroying && !scn->scn_async_stalled)) |
428870ff BB |
3155 | return (B_TRUE); |
3156 | ||
3157 | if (spa_version(scn->scn_dp->dp_spa) >= SPA_VERSION_DEADLISTS) { | |
3158 | (void) bpobj_space(&scn->scn_dp->dp_free_bpobj, | |
3159 | &used, &comp, &uncomp); | |
3160 | } | |
37f03da8 SH |
3161 | clones_left = spa_livelist_delete_check(spa); |
3162 | return ((used != 0) || (clones_left)); | |
428870ff BB |
3163 | } |
3164 | ||
80a91e74 TC |
3165 | static boolean_t |
3166 | dsl_scan_check_deferred(vdev_t *vd) | |
3167 | { | |
3168 | boolean_t need_resilver = B_FALSE; | |
3169 | ||
3170 | for (int c = 0; c < vd->vdev_children; c++) { | |
3171 | need_resilver |= | |
3172 | dsl_scan_check_deferred(vd->vdev_child[c]); | |
3173 | } | |
3174 | ||
3175 | if (!vdev_is_concrete(vd) || vd->vdev_aux || | |
3176 | !vd->vdev_ops->vdev_op_leaf) | |
3177 | return (need_resilver); | |
3178 | ||
3179 | if (!vd->vdev_resilver_deferred) | |
3180 | need_resilver = B_TRUE; | |
3181 | ||
3182 | return (need_resilver); | |
3183 | } | |
3184 | ||
d4a72f23 TC |
3185 | static boolean_t |
3186 | dsl_scan_need_resilver(spa_t *spa, const dva_t *dva, size_t psize, | |
3187 | uint64_t phys_birth) | |
3188 | { | |
3189 | vdev_t *vd; | |
3190 | ||
9e052db4 MA |
3191 | vd = vdev_lookup_top(spa, DVA_GET_VDEV(dva)); |
3192 | ||
3193 | if (vd->vdev_ops == &vdev_indirect_ops) { | |
3194 | /* | |
3195 | * The indirect vdev can point to multiple | |
3196 | * vdevs. For simplicity, always create | |
3197 | * the resilver zio_t. zio_vdev_io_start() | |
3198 | * will bypass the child resilver i/o's if | |
3199 | * they are on vdevs that don't have DTL's. | |
3200 | */ | |
3201 | return (B_TRUE); | |
3202 | } | |
3203 | ||
d4a72f23 TC |
3204 | if (DVA_GET_GANG(dva)) { |
3205 | /* | |
3206 | * Gang members may be spread across multiple | |
3207 | * vdevs, so the best estimate we have is the | |
3208 | * scrub range, which has already been checked. | |
3209 | * XXX -- it would be better to change our | |
3210 | * allocation policy to ensure that all | |
3211 | * gang members reside on the same vdev. | |
3212 | */ | |
3213 | return (B_TRUE); | |
3214 | } | |
3215 | ||
d4a72f23 TC |
3216 | /* |
3217 | * Check if the txg falls within the range which must be | |
3218 | * resilvered. DVAs outside this range can always be skipped. | |
3219 | */ | |
3220 | if (!vdev_dtl_contains(vd, DTL_PARTIAL, phys_birth, 1)) | |
3221 | return (B_FALSE); | |
3222 | ||
3223 | /* | |
3224 | * Check if the top-level vdev must resilver this offset. | |
3225 | * When the offset does not intersect with a dirty leaf DTL | |
3226 | * then it may be possible to skip the resilver IO. The psize | |
3227 | * is provided instead of asize to simplify the check for RAIDZ. | |
3228 | */ | |
3229 | if (!vdev_dtl_need_resilver(vd, DVA_GET_OFFSET(dva), psize)) | |
3230 | return (B_FALSE); | |
3231 | ||
80a91e74 TC |
3232 | /* |
3233 | * Check that this top-level vdev has a device under it which | |
3234 | * is resilvering and is not deferred. | |
3235 | */ | |
3236 | if (!dsl_scan_check_deferred(vd)) | |
3237 | return (B_FALSE); | |
3238 | ||
d4a72f23 TC |
3239 | return (B_TRUE); |
3240 | } | |
3241 | ||
d2734cce SD |
3242 | static int |
3243 | dsl_process_async_destroys(dsl_pool_t *dp, dmu_tx_t *tx) | |
428870ff BB |
3244 | { |
3245 | dsl_scan_t *scn = dp->dp_scan; | |
3246 | spa_t *spa = dp->dp_spa; | |
d2734cce | 3247 | int err = 0; |
428870ff | 3248 | |
d2734cce SD |
3249 | if (spa_suspend_async_destroy(spa)) |
3250 | return (0); | |
428870ff | 3251 | |
ba5ad9a4 | 3252 | if (zfs_free_bpobj_enabled && |
d4a72f23 | 3253 | spa_version(spa) >= SPA_VERSION_DEADLISTS) { |
9ae529ec | 3254 | scn->scn_is_bptree = B_FALSE; |
a1d477c2 | 3255 | scn->scn_async_block_min_time_ms = zfs_free_min_time_ms; |
d4a72f23 | 3256 | scn->scn_zio_root = zio_root(spa, NULL, |
428870ff BB |
3257 | NULL, ZIO_FLAG_MUSTSUCCEED); |
3258 | err = bpobj_iterate(&dp->dp_free_bpobj, | |
37f03da8 | 3259 | bpobj_dsl_scan_free_block_cb, scn, tx); |
d4a72f23 TC |
3260 | VERIFY0(zio_wait(scn->scn_zio_root)); |
3261 | scn->scn_zio_root = NULL; | |
9ae529ec | 3262 | |
fbeddd60 MA |
3263 | if (err != 0 && err != ERESTART) |
3264 | zfs_panic_recover("error %u from bpobj_iterate()", err); | |
3265 | } | |
13fe0198 | 3266 | |
fbeddd60 MA |
3267 | if (err == 0 && spa_feature_is_active(spa, SPA_FEATURE_ASYNC_DESTROY)) { |
3268 | ASSERT(scn->scn_async_destroying); | |
3269 | scn->scn_is_bptree = B_TRUE; | |
d4a72f23 | 3270 | scn->scn_zio_root = zio_root(spa, NULL, |
fbeddd60 MA |
3271 | NULL, ZIO_FLAG_MUSTSUCCEED); |
3272 | err = bptree_iterate(dp->dp_meta_objset, | |
3273 | dp->dp_bptree_obj, B_TRUE, dsl_scan_free_block_cb, scn, tx); | |
3274 | VERIFY0(zio_wait(scn->scn_zio_root)); | |
d4a72f23 | 3275 | scn->scn_zio_root = NULL; |
fbeddd60 MA |
3276 | |
3277 | if (err == EIO || err == ECKSUM) { | |
3278 | err = 0; | |
3279 | } else if (err != 0 && err != ERESTART) { | |
3280 | zfs_panic_recover("error %u from " | |
3281 | "traverse_dataset_destroyed()", err); | |
9ae529ec | 3282 | } |
fbeddd60 | 3283 | |
fbeddd60 MA |
3284 | if (bptree_is_empty(dp->dp_meta_objset, dp->dp_bptree_obj)) { |
3285 | /* finished; deactivate async destroy feature */ | |
3286 | spa_feature_decr(spa, SPA_FEATURE_ASYNC_DESTROY, tx); | |
3287 | ASSERT(!spa_feature_is_active(spa, | |
3288 | SPA_FEATURE_ASYNC_DESTROY)); | |
3289 | VERIFY0(zap_remove(dp->dp_meta_objset, | |
3290 | DMU_POOL_DIRECTORY_OBJECT, | |
3291 | DMU_POOL_BPTREE_OBJ, tx)); | |
3292 | VERIFY0(bptree_free(dp->dp_meta_objset, | |
3293 | dp->dp_bptree_obj, tx)); | |
3294 | dp->dp_bptree_obj = 0; | |
3295 | scn->scn_async_destroying = B_FALSE; | |
905edb40 | 3296 | scn->scn_async_stalled = B_FALSE; |
89b1cd65 | 3297 | } else { |
3298 | /* | |
905edb40 MA |
3299 | * If we didn't make progress, mark the async |
3300 | * destroy as stalled, so that we will not initiate | |
3301 | * a spa_sync() on its behalf. Note that we only | |
3302 | * check this if we are not finished, because if the | |
3303 | * bptree had no blocks for us to visit, we can | |
3304 | * finish without "making progress". | |
89b1cd65 | 3305 | */ |
3306 | scn->scn_async_stalled = | |
3307 | (scn->scn_visited_this_txg == 0); | |
428870ff | 3308 | } |
fbeddd60 MA |
3309 | } |
3310 | if (scn->scn_visited_this_txg) { | |
3311 | zfs_dbgmsg("freed %llu blocks in %llums from " | |
3312 | "free_bpobj/bptree txg %llu; err=%u", | |
3313 | (longlong_t)scn->scn_visited_this_txg, | |
3314 | (longlong_t) | |
3315 | NSEC2MSEC(gethrtime() - scn->scn_sync_start_time), | |
3316 | (longlong_t)tx->tx_txg, err); | |
3317 | scn->scn_visited_this_txg = 0; | |
3318 | ||
3319 | /* | |
3320 | * Write out changes to the DDT that may be required as a | |
3321 | * result of the blocks freed. This ensures that the DDT | |
3322 | * is clean when a scrub/resilver runs. | |
3323 | */ | |
3324 | ddt_sync(spa, tx->tx_txg); | |
3325 | } | |
3326 | if (err != 0) | |
d2734cce | 3327 | return (err); |
7c9abfa7 GM |
3328 | if (dp->dp_free_dir != NULL && !scn->scn_async_destroying && |
3329 | zfs_free_leak_on_eio && | |
d683ddbb JG |
3330 | (dsl_dir_phys(dp->dp_free_dir)->dd_used_bytes != 0 || |
3331 | dsl_dir_phys(dp->dp_free_dir)->dd_compressed_bytes != 0 || | |
3332 | dsl_dir_phys(dp->dp_free_dir)->dd_uncompressed_bytes != 0)) { | |
fbeddd60 MA |
3333 | /* |
3334 | * We have finished background destroying, but there is still | |
3335 | * some space left in the dp_free_dir. Transfer this leaked | |
3336 | * space to the dp_leak_dir. | |
3337 | */ | |
3338 | if (dp->dp_leak_dir == NULL) { | |
3339 | rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG); | |
3340 | (void) dsl_dir_create_sync(dp, dp->dp_root_dir, | |
3341 | LEAK_DIR_NAME, tx); | |
3342 | VERIFY0(dsl_pool_open_special_dir(dp, | |
3343 | LEAK_DIR_NAME, &dp->dp_leak_dir)); | |
3344 | rrw_exit(&dp->dp_config_rwlock, FTAG); | |
3345 | } | |
3346 | dsl_dir_diduse_space(dp->dp_leak_dir, DD_USED_HEAD, | |
d683ddbb JG |
3347 | dsl_dir_phys(dp->dp_free_dir)->dd_used_bytes, |
3348 | dsl_dir_phys(dp->dp_free_dir)->dd_compressed_bytes, | |
3349 | dsl_dir_phys(dp->dp_free_dir)->dd_uncompressed_bytes, tx); | |
fbeddd60 | 3350 | dsl_dir_diduse_space(dp->dp_free_dir, DD_USED_HEAD, |
d683ddbb JG |
3351 | -dsl_dir_phys(dp->dp_free_dir)->dd_used_bytes, |
3352 | -dsl_dir_phys(dp->dp_free_dir)->dd_compressed_bytes, | |
3353 | -dsl_dir_phys(dp->dp_free_dir)->dd_uncompressed_bytes, tx); | |
fbeddd60 | 3354 | } |
a1d477c2 | 3355 | |
37f03da8 SH |
3356 | if (dp->dp_free_dir != NULL && !scn->scn_async_destroying && |
3357 | !spa_livelist_delete_check(spa)) { | |
9b67f605 | 3358 | /* finished; verify that space accounting went to zero */ |
d683ddbb JG |
3359 | ASSERT0(dsl_dir_phys(dp->dp_free_dir)->dd_used_bytes); |
3360 | ASSERT0(dsl_dir_phys(dp->dp_free_dir)->dd_compressed_bytes); | |
3361 | ASSERT0(dsl_dir_phys(dp->dp_free_dir)->dd_uncompressed_bytes); | |
428870ff BB |
3362 | } |
3363 | ||
a1d477c2 MA |
3364 | EQUIV(bpobj_is_open(&dp->dp_obsolete_bpobj), |
3365 | 0 == zap_contains(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, | |
3366 | DMU_POOL_OBSOLETE_BPOBJ)); | |
3367 | if (err == 0 && bpobj_is_open(&dp->dp_obsolete_bpobj)) { | |
3368 | ASSERT(spa_feature_is_active(dp->dp_spa, | |
3369 | SPA_FEATURE_OBSOLETE_COUNTS)); | |
3370 | ||
3371 | scn->scn_is_bptree = B_FALSE; | |
3372 | scn->scn_async_block_min_time_ms = zfs_obsolete_min_time_ms; | |
3373 | err = bpobj_iterate(&dp->dp_obsolete_bpobj, | |
3374 | dsl_scan_obsolete_block_cb, scn, tx); | |
3375 | if (err != 0 && err != ERESTART) | |
3376 | zfs_panic_recover("error %u from bpobj_iterate()", err); | |
3377 | ||
3378 | if (bpobj_is_empty(&dp->dp_obsolete_bpobj)) | |
3379 | dsl_pool_destroy_obsolete_bpobj(dp, tx); | |
3380 | } | |
d2734cce SD |
3381 | return (0); |
3382 | } | |
3383 | ||
3384 | /* | |
3385 | * This is the primary entry point for scans that is called from syncing | |
3386 | * context. Scans must happen entirely during syncing context so that we | |
e1cfd73f | 3387 | * can guarantee that blocks we are currently scanning will not change out |
d2734cce SD |
3388 | * from under us. While a scan is active, this function controls how quickly |
3389 | * transaction groups proceed, instead of the normal handling provided by | |
3390 | * txg_sync_thread(). | |
3391 | */ | |
3392 | void | |
3393 | dsl_scan_sync(dsl_pool_t *dp, dmu_tx_t *tx) | |
3394 | { | |
3395 | int err = 0; | |
3396 | dsl_scan_t *scn = dp->dp_scan; | |
3397 | spa_t *spa = dp->dp_spa; | |
3398 | state_sync_type_t sync_type = SYNC_OPTIONAL; | |
3399 | ||
80a91e74 TC |
3400 | if (spa->spa_resilver_deferred && |
3401 | !spa_feature_is_active(dp->dp_spa, SPA_FEATURE_RESILVER_DEFER)) | |
3402 | spa_feature_incr(spa, SPA_FEATURE_RESILVER_DEFER, tx); | |
3403 | ||
d2734cce SD |
3404 | /* |
3405 | * Check for scn_restart_txg before checking spa_load_state, so | |
3406 | * that we can restart an old-style scan while the pool is being | |
80a91e74 TC |
3407 | * imported (see dsl_scan_init). We also restart scans if there |
3408 | * is a deferred resilver and the user has manually disabled | |
3409 | * deferred resilvers via the tunable. | |
d2734cce | 3410 | */ |
80a91e74 TC |
3411 | if (dsl_scan_restarting(scn, tx) || |
3412 | (spa->spa_resilver_deferred && zfs_resilver_disable_defer)) { | |
d2734cce SD |
3413 | pool_scan_func_t func = POOL_SCAN_SCRUB; |
3414 | dsl_scan_done(scn, B_FALSE, tx); | |
3415 | if (vdev_resilver_needed(spa->spa_root_vdev, NULL, NULL)) | |
3416 | func = POOL_SCAN_RESILVER; | |
3417 | zfs_dbgmsg("restarting scan func=%u txg=%llu", | |
3418 | func, (longlong_t)tx->tx_txg); | |
3419 | dsl_scan_setup_sync(&func, tx); | |
3420 | } | |
3421 | ||
3422 | /* | |
3423 | * Only process scans in sync pass 1. | |
3424 | */ | |
3425 | if (spa_sync_pass(spa) > 1) | |
3426 | return; | |
3427 | ||
3428 | /* | |
3429 | * If the spa is shutting down, then stop scanning. This will | |
3430 | * ensure that the scan does not dirty any new data during the | |
3431 | * shutdown phase. | |
3432 | */ | |
3433 | if (spa_shutting_down(spa)) | |
3434 | return; | |
3435 | ||
3436 | /* | |
3437 | * If the scan is inactive due to a stalled async destroy, try again. | |
3438 | */ | |
3439 | if (!scn->scn_async_stalled && !dsl_scan_active(scn)) | |
3440 | return; | |
3441 | ||
3442 | /* reset scan statistics */ | |
3443 | scn->scn_visited_this_txg = 0; | |
3444 | scn->scn_holes_this_txg = 0; | |
3445 | scn->scn_lt_min_this_txg = 0; | |
3446 | scn->scn_gt_max_this_txg = 0; | |
3447 | scn->scn_ddt_contained_this_txg = 0; | |
3448 | scn->scn_objsets_visited_this_txg = 0; | |
3449 | scn->scn_avg_seg_size_this_txg = 0; | |
3450 | scn->scn_segs_this_txg = 0; | |
3451 | scn->scn_avg_zio_size_this_txg = 0; | |
3452 | scn->scn_zios_this_txg = 0; | |
3453 | scn->scn_suspending = B_FALSE; | |
3454 | scn->scn_sync_start_time = gethrtime(); | |
3455 | spa->spa_scrub_active = B_TRUE; | |
3456 | ||
3457 | /* | |
3458 | * First process the async destroys. If we suspend, don't do | |
3459 | * any scrubbing or resilvering. This ensures that there are no | |
3460 | * async destroys while we are scanning, so the scan code doesn't | |
3461 | * have to worry about traversing it. It is also faster to free the | |
3462 | * blocks than to scrub them. | |
3463 | */ | |
3464 | err = dsl_process_async_destroys(dp, tx); | |
3465 | if (err != 0) | |
3466 | return; | |
a1d477c2 | 3467 | |
d4a72f23 | 3468 | if (!dsl_scan_is_running(scn) || dsl_scan_is_paused_scrub(scn)) |
428870ff BB |
3469 | return; |
3470 | ||
d4a72f23 TC |
3471 | /* |
3472 | * Wait a few txgs after importing to begin scanning so that | |
3473 | * we can get the pool imported quickly. | |
3474 | */ | |
3475 | if (spa->spa_syncing_txg < spa->spa_first_txg + SCAN_IMPORT_WAIT_TXGS) | |
5d1f7fb6 | 3476 | return; |
5d1f7fb6 | 3477 | |
cef48f14 TC |
3478 | /* |
3479 | * zfs_scan_suspend_progress can be set to disable scan progress. | |
3480 | * We don't want to spin the txg_sync thread, so we add a delay | |
3481 | * here to simulate the time spent doing a scan. This is mostly | |
3482 | * useful for testing and debugging. | |
3483 | */ | |
3484 | if (zfs_scan_suspend_progress) { | |
3485 | uint64_t scan_time_ns = gethrtime() - scn->scn_sync_start_time; | |
3486 | int mintime = (scn->scn_phys.scn_func == POOL_SCAN_RESILVER) ? | |
3487 | zfs_resilver_min_time_ms : zfs_scrub_min_time_ms; | |
3488 | ||
3489 | while (zfs_scan_suspend_progress && | |
3490 | !txg_sync_waiting(scn->scn_dp) && | |
3491 | !spa_shutting_down(scn->scn_dp->dp_spa) && | |
3492 | NSEC2MSEC(scan_time_ns) < mintime) { | |
3493 | delay(hz); | |
3494 | scan_time_ns = gethrtime() - scn->scn_sync_start_time; | |
3495 | } | |
3496 | return; | |
3497 | } | |
3498 | ||
d4a72f23 TC |
3499 | /* |
3500 | * It is possible to switch from unsorted to sorted at any time, | |
3501 | * but afterwards the scan will remain sorted unless reloaded from | |
3502 | * a checkpoint after a reboot. | |
3503 | */ | |
3504 | if (!zfs_scan_legacy) { | |
3505 | scn->scn_is_sorted = B_TRUE; | |
3506 | if (scn->scn_last_checkpoint == 0) | |
3507 | scn->scn_last_checkpoint = ddi_get_lbolt(); | |
3508 | } | |
0ea05c64 | 3509 | |
d4a72f23 TC |
3510 | /* |
3511 | * For sorted scans, determine what kind of work we will be doing | |
3512 | * this txg based on our memory limitations and whether or not we | |
3513 | * need to perform a checkpoint. | |
3514 | */ | |
3515 | if (scn->scn_is_sorted) { | |
3516 | /* | |
3517 | * If we are over our checkpoint interval, set scn_clearing | |
3518 | * so that we can begin checkpointing immediately. The | |
13a2ff27 | 3519 | * checkpoint allows us to save a consistent bookmark |
d4a72f23 TC |
3520 | * representing how much data we have scrubbed so far. |
3521 | * Otherwise, use the memory limit to determine if we should | |
3522 | * scan for metadata or start issue scrub IOs. We accumulate | |
3523 | * metadata until we hit our hard memory limit at which point | |
3524 | * we issue scrub IOs until we are at our soft memory limit. | |
3525 | */ | |
3526 | if (scn->scn_checkpointing || | |
3527 | ddi_get_lbolt() - scn->scn_last_checkpoint > | |
3528 | SEC_TO_TICK(zfs_scan_checkpoint_intval)) { | |
3529 | if (!scn->scn_checkpointing) | |
3530 | zfs_dbgmsg("begin scan checkpoint"); | |
3531 | ||
3532 | scn->scn_checkpointing = B_TRUE; | |
3533 | scn->scn_clearing = B_TRUE; | |
3534 | } else { | |
3535 | boolean_t should_clear = dsl_scan_should_clear(scn); | |
3536 | if (should_clear && !scn->scn_clearing) { | |
3537 | zfs_dbgmsg("begin scan clearing"); | |
3538 | scn->scn_clearing = B_TRUE; | |
3539 | } else if (!should_clear && scn->scn_clearing) { | |
3540 | zfs_dbgmsg("finish scan clearing"); | |
3541 | scn->scn_clearing = B_FALSE; | |
3542 | } | |
3543 | } | |
428870ff | 3544 | } else { |
d4a72f23 TC |
3545 | ASSERT0(scn->scn_checkpointing); |
3546 | ASSERT0(scn->scn_clearing); | |
428870ff BB |
3547 | } |
3548 | ||
d4a72f23 TC |
3549 | if (!scn->scn_clearing && scn->scn_done_txg == 0) { |
3550 | /* Need to scan metadata for more blocks to scrub */ | |
3551 | dsl_scan_phys_t *scnp = &scn->scn_phys; | |
3552 | taskqid_t prefetch_tqid; | |
3553 | uint64_t bytes_per_leaf = zfs_scan_vdev_limit; | |
3554 | uint64_t nr_leaves = dsl_scan_count_leaves(spa->spa_root_vdev); | |
428870ff | 3555 | |
d4a72f23 | 3556 | /* |
f90a30ad | 3557 | * Recalculate the max number of in-flight bytes for pool-wide |
d4a72f23 TC |
3558 | * scanning operations (minimum 1MB). Limits for the issuing |
3559 | * phase are done per top-level vdev and are handled separately. | |
3560 | */ | |
3561 | scn->scn_maxinflight_bytes = | |
3562 | MAX(nr_leaves * bytes_per_leaf, 1ULL << 20); | |
3563 | ||
3564 | if (scnp->scn_ddt_bookmark.ddb_class <= | |
3565 | scnp->scn_ddt_class_max) { | |
3566 | ASSERT(ZB_IS_ZERO(&scnp->scn_bookmark)); | |
3567 | zfs_dbgmsg("doing scan sync txg %llu; " | |
3568 | "ddt bm=%llu/%llu/%llu/%llx", | |
3569 | (longlong_t)tx->tx_txg, | |
3570 | (longlong_t)scnp->scn_ddt_bookmark.ddb_class, | |
3571 | (longlong_t)scnp->scn_ddt_bookmark.ddb_type, | |
3572 | (longlong_t)scnp->scn_ddt_bookmark.ddb_checksum, | |
3573 | (longlong_t)scnp->scn_ddt_bookmark.ddb_cursor); | |
3574 | } else { | |
3575 | zfs_dbgmsg("doing scan sync txg %llu; " | |
3576 | "bm=%llu/%llu/%llu/%llu", | |
3577 | (longlong_t)tx->tx_txg, | |
3578 | (longlong_t)scnp->scn_bookmark.zb_objset, | |
3579 | (longlong_t)scnp->scn_bookmark.zb_object, | |
3580 | (longlong_t)scnp->scn_bookmark.zb_level, | |
3581 | (longlong_t)scnp->scn_bookmark.zb_blkid); | |
3582 | } | |
428870ff | 3583 | |
d4a72f23 TC |
3584 | scn->scn_zio_root = zio_root(dp->dp_spa, NULL, |
3585 | NULL, ZIO_FLAG_CANFAIL); | |
428870ff | 3586 | |
d4a72f23 TC |
3587 | scn->scn_prefetch_stop = B_FALSE; |
3588 | prefetch_tqid = taskq_dispatch(dp->dp_sync_taskq, | |
3589 | dsl_scan_prefetch_thread, scn, TQ_SLEEP); | |
3590 | ASSERT(prefetch_tqid != TASKQID_INVALID); | |
428870ff | 3591 | |
d4a72f23 TC |
3592 | dsl_pool_config_enter(dp, FTAG); |
3593 | dsl_scan_visit(scn, tx); | |
3594 | dsl_pool_config_exit(dp, FTAG); | |
428870ff | 3595 | |
d4a72f23 TC |
3596 | mutex_enter(&dp->dp_spa->spa_scrub_lock); |
3597 | scn->scn_prefetch_stop = B_TRUE; | |
3598 | cv_broadcast(&spa->spa_scrub_io_cv); | |
3599 | mutex_exit(&dp->dp_spa->spa_scrub_lock); | |
428870ff | 3600 | |
d4a72f23 TC |
3601 | taskq_wait_id(dp->dp_sync_taskq, prefetch_tqid); |
3602 | (void) zio_wait(scn->scn_zio_root); | |
3603 | scn->scn_zio_root = NULL; | |
3604 | ||
3605 | zfs_dbgmsg("scan visited %llu blocks in %llums " | |
3606 | "(%llu os's, %llu holes, %llu < mintxg, " | |
3607 | "%llu in ddt, %llu > maxtxg)", | |
3608 | (longlong_t)scn->scn_visited_this_txg, | |
3609 | (longlong_t)NSEC2MSEC(gethrtime() - | |
3610 | scn->scn_sync_start_time), | |
3611 | (longlong_t)scn->scn_objsets_visited_this_txg, | |
3612 | (longlong_t)scn->scn_holes_this_txg, | |
3613 | (longlong_t)scn->scn_lt_min_this_txg, | |
3614 | (longlong_t)scn->scn_ddt_contained_this_txg, | |
3615 | (longlong_t)scn->scn_gt_max_this_txg); | |
3616 | ||
3617 | if (!scn->scn_suspending) { | |
3618 | ASSERT0(avl_numnodes(&scn->scn_queue)); | |
3619 | scn->scn_done_txg = tx->tx_txg + 1; | |
3620 | if (scn->scn_is_sorted) { | |
3621 | scn->scn_checkpointing = B_TRUE; | |
3622 | scn->scn_clearing = B_TRUE; | |
3623 | } | |
3624 | zfs_dbgmsg("scan complete txg %llu", | |
3625 | (longlong_t)tx->tx_txg); | |
3626 | } | |
3627 | } else if (scn->scn_is_sorted && scn->scn_bytes_pending != 0) { | |
5e0bd0ae TC |
3628 | ASSERT(scn->scn_clearing); |
3629 | ||
d4a72f23 TC |
3630 | /* need to issue scrubbing IOs from per-vdev queues */ |
3631 | scn->scn_zio_root = zio_root(dp->dp_spa, NULL, | |
3632 | NULL, ZIO_FLAG_CANFAIL); | |
3633 | scan_io_queues_run(scn); | |
3634 | (void) zio_wait(scn->scn_zio_root); | |
3635 | scn->scn_zio_root = NULL; | |
3636 | ||
3637 | /* calculate and dprintf the current memory usage */ | |
3638 | (void) dsl_scan_should_clear(scn); | |
3639 | dsl_scan_update_stats(scn); | |
3640 | ||
3641 | zfs_dbgmsg("scan issued %llu blocks (%llu segs) in %llums " | |
3642 | "(avg_block_size = %llu, avg_seg_size = %llu)", | |
3643 | (longlong_t)scn->scn_zios_this_txg, | |
3644 | (longlong_t)scn->scn_segs_this_txg, | |
3645 | (longlong_t)NSEC2MSEC(gethrtime() - | |
3646 | scn->scn_sync_start_time), | |
3647 | (longlong_t)scn->scn_avg_zio_size_this_txg, | |
3648 | (longlong_t)scn->scn_avg_seg_size_this_txg); | |
3649 | } else if (scn->scn_done_txg != 0 && scn->scn_done_txg <= tx->tx_txg) { | |
3650 | /* Finished with everything. Mark the scrub as complete */ | |
3651 | zfs_dbgmsg("scan issuing complete txg %llu", | |
3652 | (longlong_t)tx->tx_txg); | |
3653 | ASSERT3U(scn->scn_done_txg, !=, 0); | |
3654 | ASSERT0(spa->spa_scrub_inflight); | |
3655 | ASSERT0(scn->scn_bytes_pending); | |
3656 | dsl_scan_done(scn, B_TRUE, tx); | |
3657 | sync_type = SYNC_MANDATORY; | |
428870ff | 3658 | } |
428870ff | 3659 | |
d4a72f23 | 3660 | dsl_scan_sync_state(scn, tx, sync_type); |
428870ff BB |
3661 | } |
3662 | ||
428870ff | 3663 | static void |
d4a72f23 | 3664 | count_block(dsl_scan_t *scn, zfs_all_blkstats_t *zab, const blkptr_t *bp) |
428870ff BB |
3665 | { |
3666 | int i; | |
3667 | ||
3b61ca3e TC |
3668 | /* |
3669 | * Don't count embedded bp's, since we already did the work of | |
3670 | * scanning these when we scanned the containing block. | |
3671 | */ | |
3672 | if (BP_IS_EMBEDDED(bp)) | |
3673 | return; | |
3674 | ||
ab7615d9 TC |
3675 | /* |
3676 | * Update the spa's stats on how many bytes we have issued. | |
3677 | * Sequential scrubs create a zio for each DVA of the bp. Each | |
3678 | * of these will include all DVAs for repair purposes, but the | |
3679 | * zio code will only try the first one unless there is an issue. | |
3680 | * Therefore, we should only count the first DVA for these IOs. | |
3681 | */ | |
3682 | if (scn->scn_is_sorted) { | |
d4a72f23 | 3683 | atomic_add_64(&scn->scn_dp->dp_spa->spa_scan_pass_issued, |
ab7615d9 TC |
3684 | DVA_GET_ASIZE(&bp->blk_dva[0])); |
3685 | } else { | |
3686 | spa_t *spa = scn->scn_dp->dp_spa; | |
3687 | ||
3688 | for (i = 0; i < BP_GET_NDVAS(bp); i++) { | |
3689 | atomic_add_64(&spa->spa_scan_pass_issued, | |
3690 | DVA_GET_ASIZE(&bp->blk_dva[i])); | |
3691 | } | |
d4a72f23 TC |
3692 | } |
3693 | ||
428870ff BB |
3694 | /* |
3695 | * If we resume after a reboot, zab will be NULL; don't record | |
3696 | * incomplete stats in that case. | |
3697 | */ | |
3698 | if (zab == NULL) | |
3699 | return; | |
3700 | ||
d4a72f23 TC |
3701 | mutex_enter(&zab->zab_lock); |
3702 | ||
428870ff BB |
3703 | for (i = 0; i < 4; i++) { |
3704 | int l = (i < 2) ? BP_GET_LEVEL(bp) : DN_MAX_LEVELS; | |
3705 | int t = (i & 1) ? BP_GET_TYPE(bp) : DMU_OT_TOTAL; | |
9ae529ec CS |
3706 | |
3707 | if (t & DMU_OT_NEWTYPE) | |
3708 | t = DMU_OT_OTHER; | |
1c27024e DB |
3709 | zfs_blkstat_t *zb = &zab->zab_type[l][t]; |
3710 | int equal; | |
428870ff BB |
3711 | |
3712 | zb->zb_count++; | |
3713 | zb->zb_asize += BP_GET_ASIZE(bp); | |
3714 | zb->zb_lsize += BP_GET_LSIZE(bp); | |
3715 | zb->zb_psize += BP_GET_PSIZE(bp); | |
3716 | zb->zb_gangs += BP_COUNT_GANG(bp); | |
3717 | ||
3718 | switch (BP_GET_NDVAS(bp)) { | |
3719 | case 2: | |
3720 | if (DVA_GET_VDEV(&bp->blk_dva[0]) == | |
3721 | DVA_GET_VDEV(&bp->blk_dva[1])) | |
3722 | zb->zb_ditto_2_of_2_samevdev++; | |
3723 | break; | |
3724 | case 3: | |
3725 | equal = (DVA_GET_VDEV(&bp->blk_dva[0]) == | |
3726 | DVA_GET_VDEV(&bp->blk_dva[1])) + | |
3727 | (DVA_GET_VDEV(&bp->blk_dva[0]) == | |
3728 | DVA_GET_VDEV(&bp->blk_dva[2])) + | |
3729 | (DVA_GET_VDEV(&bp->blk_dva[1]) == | |
3730 | DVA_GET_VDEV(&bp->blk_dva[2])); | |
3731 | if (equal == 1) | |
3732 | zb->zb_ditto_2_of_3_samevdev++; | |
3733 | else if (equal == 3) | |
3734 | zb->zb_ditto_3_of_3_samevdev++; | |
3735 | break; | |
3736 | } | |
3737 | } | |
d4a72f23 TC |
3738 | |
3739 | mutex_exit(&zab->zab_lock); | |
428870ff BB |
3740 | } |
3741 | ||
3742 | static void | |
d4a72f23 | 3743 | scan_io_queue_insert_impl(dsl_scan_io_queue_t *queue, scan_io_t *sio) |
428870ff | 3744 | { |
d4a72f23 | 3745 | avl_index_t idx; |
ab7615d9 | 3746 | int64_t asize = SIO_GET_ASIZE(sio); |
d4a72f23 | 3747 | dsl_scan_t *scn = queue->q_scn; |
428870ff | 3748 | |
d4a72f23 | 3749 | ASSERT(MUTEX_HELD(&queue->q_vd->vdev_scan_io_queue_lock)); |
428870ff | 3750 | |
d4a72f23 TC |
3751 | if (avl_find(&queue->q_sios_by_addr, sio, &idx) != NULL) { |
3752 | /* block is already scheduled for reading */ | |
3753 | atomic_add_64(&scn->scn_bytes_pending, -asize); | |
ab7615d9 | 3754 | sio_free(sio); |
d4a72f23 | 3755 | return; |
428870ff | 3756 | } |
d4a72f23 | 3757 | avl_insert(&queue->q_sios_by_addr, sio, idx); |
ab7615d9 TC |
3758 | queue->q_sio_memused += SIO_GET_MUSED(sio); |
3759 | range_tree_add(queue->q_exts_by_addr, SIO_GET_OFFSET(sio), asize); | |
428870ff BB |
3760 | } |
3761 | ||
d4a72f23 TC |
3762 | /* |
3763 | * Given all the info we got from our metadata scanning process, we | |
3764 | * construct a scan_io_t and insert it into the scan sorting queue. The | |
3765 | * I/O must already be suitable for us to process. This is controlled | |
3766 | * by dsl_scan_enqueue(). | |
3767 | */ | |
3768 | static void | |
3769 | scan_io_queue_insert(dsl_scan_io_queue_t *queue, const blkptr_t *bp, int dva_i, | |
3770 | int zio_flags, const zbookmark_phys_t *zb) | |
3d6da72d | 3771 | { |
d4a72f23 | 3772 | dsl_scan_t *scn = queue->q_scn; |
ab7615d9 | 3773 | scan_io_t *sio = sio_alloc(BP_GET_NDVAS(bp)); |
3d6da72d | 3774 | |
d4a72f23 TC |
3775 | ASSERT0(BP_IS_GANG(bp)); |
3776 | ASSERT(MUTEX_HELD(&queue->q_vd->vdev_scan_io_queue_lock)); | |
3d6da72d | 3777 | |
d4a72f23 TC |
3778 | bp2sio(bp, sio, dva_i); |
3779 | sio->sio_flags = zio_flags; | |
3780 | sio->sio_zb = *zb; | |
3d6da72d IH |
3781 | |
3782 | /* | |
d4a72f23 TC |
3783 | * Increment the bytes pending counter now so that we can't |
3784 | * get an integer underflow in case the worker processes the | |
3785 | * zio before we get to incrementing this counter. | |
3d6da72d | 3786 | */ |
ab7615d9 | 3787 | atomic_add_64(&scn->scn_bytes_pending, SIO_GET_ASIZE(sio)); |
d4a72f23 TC |
3788 | |
3789 | scan_io_queue_insert_impl(queue, sio); | |
3790 | } | |
3791 | ||
3792 | /* | |
3793 | * Given a set of I/O parameters as discovered by the metadata traversal | |
3794 | * process, attempts to place the I/O into the sorted queues (if allowed), | |
3795 | * or immediately executes the I/O. | |
3796 | */ | |
3797 | static void | |
3798 | dsl_scan_enqueue(dsl_pool_t *dp, const blkptr_t *bp, int zio_flags, | |
3799 | const zbookmark_phys_t *zb) | |
3800 | { | |
3801 | spa_t *spa = dp->dp_spa; | |
3802 | ||
3803 | ASSERT(!BP_IS_EMBEDDED(bp)); | |
3d6da72d IH |
3804 | |
3805 | /* | |
d4a72f23 TC |
3806 | * Gang blocks are hard to issue sequentially, so we just issue them |
3807 | * here immediately instead of queuing them. | |
3d6da72d | 3808 | */ |
d4a72f23 TC |
3809 | if (!dp->dp_scan->scn_is_sorted || BP_IS_GANG(bp)) { |
3810 | scan_exec_io(dp, bp, zio_flags, zb, NULL); | |
3811 | return; | |
3812 | } | |
3d6da72d | 3813 | |
d4a72f23 TC |
3814 | for (int i = 0; i < BP_GET_NDVAS(bp); i++) { |
3815 | dva_t dva; | |
3816 | vdev_t *vdev; | |
3817 | ||
3818 | dva = bp->blk_dva[i]; | |
3819 | vdev = vdev_lookup_top(spa, DVA_GET_VDEV(&dva)); | |
3820 | ASSERT(vdev != NULL); | |
3821 | ||
3822 | mutex_enter(&vdev->vdev_scan_io_queue_lock); | |
3823 | if (vdev->vdev_scan_io_queue == NULL) | |
3824 | vdev->vdev_scan_io_queue = scan_io_queue_create(vdev); | |
3825 | ASSERT(dp->dp_scan != NULL); | |
3826 | scan_io_queue_insert(vdev->vdev_scan_io_queue, bp, | |
3827 | i, zio_flags, zb); | |
3828 | mutex_exit(&vdev->vdev_scan_io_queue_lock); | |
3829 | } | |
3d6da72d IH |
3830 | } |
3831 | ||
428870ff BB |
3832 | static int |
3833 | dsl_scan_scrub_cb(dsl_pool_t *dp, | |
5dbd68a3 | 3834 | const blkptr_t *bp, const zbookmark_phys_t *zb) |
428870ff BB |
3835 | { |
3836 | dsl_scan_t *scn = dp->dp_scan; | |
428870ff BB |
3837 | spa_t *spa = dp->dp_spa; |
3838 | uint64_t phys_birth = BP_PHYSICAL_BIRTH(bp); | |
d4a72f23 | 3839 | size_t psize = BP_GET_PSIZE(bp); |
d6320ddb | 3840 | boolean_t needs_io = B_FALSE; |
572e2857 | 3841 | int zio_flags = ZIO_FLAG_SCAN_THREAD | ZIO_FLAG_RAW | ZIO_FLAG_CANFAIL; |
428870ff | 3842 | |
00c405b4 | 3843 | |
428870ff | 3844 | if (phys_birth <= scn->scn_phys.scn_min_txg || |
863522b1 SN |
3845 | phys_birth >= scn->scn_phys.scn_max_txg) { |
3846 | count_block(scn, dp->dp_blkstats, bp); | |
428870ff | 3847 | return (0); |
863522b1 | 3848 | } |
428870ff | 3849 | |
00c405b4 MA |
3850 | /* Embedded BP's have phys_birth==0, so we reject them above. */ |
3851 | ASSERT(!BP_IS_EMBEDDED(bp)); | |
9b67f605 | 3852 | |
428870ff BB |
3853 | ASSERT(DSL_SCAN_IS_SCRUB_RESILVER(scn)); |
3854 | if (scn->scn_phys.scn_func == POOL_SCAN_SCRUB) { | |
3855 | zio_flags |= ZIO_FLAG_SCRUB; | |
428870ff | 3856 | needs_io = B_TRUE; |
a117a6d6 GW |
3857 | } else { |
3858 | ASSERT3U(scn->scn_phys.scn_func, ==, POOL_SCAN_RESILVER); | |
428870ff | 3859 | zio_flags |= ZIO_FLAG_RESILVER; |
428870ff BB |
3860 | needs_io = B_FALSE; |
3861 | } | |
3862 | ||
3863 | /* If it's an intent log block, failure is expected. */ | |
3864 | if (zb->zb_level == ZB_ZIL_LEVEL) | |
3865 | zio_flags |= ZIO_FLAG_SPECULATIVE; | |
3866 | ||
1c27024e | 3867 | for (int d = 0; d < BP_GET_NDVAS(bp); d++) { |
3d6da72d | 3868 | const dva_t *dva = &bp->blk_dva[d]; |
428870ff BB |
3869 | |
3870 | /* | |
3871 | * Keep track of how much data we've examined so that | |
3872 | * zpool(1M) status can make useful progress reports. | |
3873 | */ | |
3d6da72d IH |
3874 | scn->scn_phys.scn_examined += DVA_GET_ASIZE(dva); |
3875 | spa->spa_scan_pass_exam += DVA_GET_ASIZE(dva); | |
428870ff BB |
3876 | |
3877 | /* if it's a resilver, this may not be in the target range */ | |
3d6da72d IH |
3878 | if (!needs_io) |
3879 | needs_io = dsl_scan_need_resilver(spa, dva, psize, | |
3880 | phys_birth); | |
428870ff BB |
3881 | } |
3882 | ||
3883 | if (needs_io && !zfs_no_scrub_io) { | |
d4a72f23 TC |
3884 | dsl_scan_enqueue(dp, bp, zio_flags, zb); |
3885 | } else { | |
3886 | count_block(scn, dp->dp_blkstats, bp); | |
3887 | } | |
3888 | ||
3889 | /* do not relocate this block */ | |
3890 | return (0); | |
3891 | } | |
3892 | ||
3893 | static void | |
3894 | dsl_scan_scrub_done(zio_t *zio) | |
3895 | { | |
3896 | spa_t *spa = zio->io_spa; | |
3897 | blkptr_t *bp = zio->io_bp; | |
3898 | dsl_scan_io_queue_t *queue = zio->io_private; | |
3899 | ||
3900 | abd_free(zio->io_abd); | |
3901 | ||
3902 | if (queue == NULL) { | |
3903 | mutex_enter(&spa->spa_scrub_lock); | |
3904 | ASSERT3U(spa->spa_scrub_inflight, >=, BP_GET_PSIZE(bp)); | |
3905 | spa->spa_scrub_inflight -= BP_GET_PSIZE(bp); | |
3906 | cv_broadcast(&spa->spa_scrub_io_cv); | |
3907 | mutex_exit(&spa->spa_scrub_lock); | |
3908 | } else { | |
3909 | mutex_enter(&queue->q_vd->vdev_scan_io_queue_lock); | |
3910 | ASSERT3U(queue->q_inflight_bytes, >=, BP_GET_PSIZE(bp)); | |
3911 | queue->q_inflight_bytes -= BP_GET_PSIZE(bp); | |
3912 | cv_broadcast(&queue->q_zio_cv); | |
3913 | mutex_exit(&queue->q_vd->vdev_scan_io_queue_lock); | |
3914 | } | |
3915 | ||
3916 | if (zio->io_error && (zio->io_error != ECKSUM || | |
3917 | !(zio->io_flags & ZIO_FLAG_SPECULATIVE))) { | |
3918 | atomic_inc_64(&spa->spa_dsl_pool->dp_scan->scn_phys.scn_errors); | |
3919 | } | |
3920 | } | |
428870ff | 3921 | |
d4a72f23 TC |
3922 | /* |
3923 | * Given a scanning zio's information, executes the zio. The zio need | |
3924 | * not necessarily be only sortable, this function simply executes the | |
3925 | * zio, no matter what it is. The optional queue argument allows the | |
3926 | * caller to specify that they want per top level vdev IO rate limiting | |
3927 | * instead of the legacy global limiting. | |
3928 | */ | |
3929 | static void | |
3930 | scan_exec_io(dsl_pool_t *dp, const blkptr_t *bp, int zio_flags, | |
3931 | const zbookmark_phys_t *zb, dsl_scan_io_queue_t *queue) | |
3932 | { | |
3933 | spa_t *spa = dp->dp_spa; | |
3934 | dsl_scan_t *scn = dp->dp_scan; | |
3935 | size_t size = BP_GET_PSIZE(bp); | |
3936 | abd_t *data = abd_alloc_for_io(size, B_FALSE); | |
3937 | ||
f90a30ad BB |
3938 | ASSERT3U(scn->scn_maxinflight_bytes, >, 0); |
3939 | ||
d4a72f23 | 3940 | if (queue == NULL) { |
428870ff | 3941 | mutex_enter(&spa->spa_scrub_lock); |
d4a72f23 | 3942 | while (spa->spa_scrub_inflight >= scn->scn_maxinflight_bytes) |
428870ff | 3943 | cv_wait(&spa->spa_scrub_io_cv, &spa->spa_scrub_lock); |
d4a72f23 | 3944 | spa->spa_scrub_inflight += BP_GET_PSIZE(bp); |
428870ff | 3945 | mutex_exit(&spa->spa_scrub_lock); |
d4a72f23 TC |
3946 | } else { |
3947 | kmutex_t *q_lock = &queue->q_vd->vdev_scan_io_queue_lock; | |
428870ff | 3948 | |
d4a72f23 TC |
3949 | mutex_enter(q_lock); |
3950 | while (queue->q_inflight_bytes >= queue->q_maxinflight_bytes) | |
3951 | cv_wait(&queue->q_zio_cv, q_lock); | |
3952 | queue->q_inflight_bytes += BP_GET_PSIZE(bp); | |
3953 | mutex_exit(q_lock); | |
3954 | } | |
3955 | ||
3956 | count_block(scn, dp->dp_blkstats, bp); | |
3957 | zio_nowait(zio_read(scn->scn_zio_root, spa, bp, data, size, | |
3958 | dsl_scan_scrub_done, queue, ZIO_PRIORITY_SCRUB, zio_flags, zb)); | |
3959 | } | |
572e2857 | 3960 | |
d4a72f23 TC |
3961 | /* |
3962 | * This is the primary extent sorting algorithm. We balance two parameters: | |
3963 | * 1) how many bytes of I/O are in an extent | |
3964 | * 2) how well the extent is filled with I/O (as a fraction of its total size) | |
3965 | * Since we allow extents to have gaps between their constituent I/Os, it's | |
3966 | * possible to have a fairly large extent that contains the same amount of | |
3967 | * I/O bytes than a much smaller extent, which just packs the I/O more tightly. | |
3968 | * The algorithm sorts based on a score calculated from the extent's size, | |
3969 | * the relative fill volume (in %) and a "fill weight" parameter that controls | |
3970 | * the split between whether we prefer larger extents or more well populated | |
3971 | * extents: | |
3972 | * | |
3973 | * SCORE = FILL_IN_BYTES + (FILL_IN_PERCENT * FILL_IN_BYTES * FILL_WEIGHT) | |
3974 | * | |
3975 | * Example: | |
3976 | * 1) assume extsz = 64 MiB | |
3977 | * 2) assume fill = 32 MiB (extent is half full) | |
3978 | * 3) assume fill_weight = 3 | |
3979 | * 4) SCORE = 32M + (((32M * 100) / 64M) * 3 * 32M) / 100 | |
3980 | * SCORE = 32M + (50 * 3 * 32M) / 100 | |
3981 | * SCORE = 32M + (4800M / 100) | |
3982 | * SCORE = 32M + 48M | |
3983 | * ^ ^ | |
3984 | * | +--- final total relative fill-based score | |
3985 | * +--------- final total fill-based score | |
3986 | * SCORE = 80M | |
3987 | * | |
3988 | * As can be seen, at fill_ratio=3, the algorithm is slightly biased towards | |
3989 | * extents that are more completely filled (in a 3:2 ratio) vs just larger. | |
3990 | * Note that as an optimization, we replace multiplication and division by | |
e1cfd73f | 3991 | * 100 with bitshifting by 7 (which effectively multiplies and divides by 128). |
d4a72f23 TC |
3992 | */ |
3993 | static int | |
3994 | ext_size_compare(const void *x, const void *y) | |
3995 | { | |
3996 | const range_seg_t *rsa = x, *rsb = y; | |
3997 | uint64_t sa = rsa->rs_end - rsa->rs_start, | |
3998 | sb = rsb->rs_end - rsb->rs_start; | |
3999 | uint64_t score_a, score_b; | |
4000 | ||
4001 | score_a = rsa->rs_fill + ((((rsa->rs_fill << 7) / sa) * | |
4002 | fill_weight * rsa->rs_fill) >> 7); | |
4003 | score_b = rsb->rs_fill + ((((rsb->rs_fill << 7) / sb) * | |
4004 | fill_weight * rsb->rs_fill) >> 7); | |
4005 | ||
4006 | if (score_a > score_b) | |
4007 | return (-1); | |
4008 | if (score_a == score_b) { | |
4009 | if (rsa->rs_start < rsb->rs_start) | |
4010 | return (-1); | |
4011 | if (rsa->rs_start == rsb->rs_start) | |
4012 | return (0); | |
4013 | return (1); | |
428870ff | 4014 | } |
d4a72f23 TC |
4015 | return (1); |
4016 | } | |
428870ff | 4017 | |
d4a72f23 TC |
4018 | /* |
4019 | * Comparator for the q_sios_by_addr tree. Sorting is simply performed | |
4020 | * based on LBA-order (from lowest to highest). | |
4021 | */ | |
4022 | static int | |
4023 | sio_addr_compare(const void *x, const void *y) | |
4024 | { | |
4025 | const scan_io_t *a = x, *b = y; | |
4026 | ||
ab7615d9 | 4027 | return (AVL_CMP(SIO_GET_OFFSET(a), SIO_GET_OFFSET(b))); |
d4a72f23 TC |
4028 | } |
4029 | ||
4030 | /* IO queues are created on demand when they are needed. */ | |
4031 | static dsl_scan_io_queue_t * | |
4032 | scan_io_queue_create(vdev_t *vd) | |
4033 | { | |
4034 | dsl_scan_t *scn = vd->vdev_spa->spa_dsl_pool->dp_scan; | |
4035 | dsl_scan_io_queue_t *q = kmem_zalloc(sizeof (*q), KM_SLEEP); | |
4036 | ||
4037 | q->q_scn = scn; | |
4038 | q->q_vd = vd; | |
ab7615d9 | 4039 | q->q_sio_memused = 0; |
d4a72f23 TC |
4040 | cv_init(&q->q_zio_cv, NULL, CV_DEFAULT, NULL); |
4041 | q->q_exts_by_addr = range_tree_create_impl(&rt_avl_ops, | |
a1d477c2 | 4042 | &q->q_exts_by_size, ext_size_compare, zfs_scan_max_ext_gap); |
d4a72f23 TC |
4043 | avl_create(&q->q_sios_by_addr, sio_addr_compare, |
4044 | sizeof (scan_io_t), offsetof(scan_io_t, sio_nodes.sio_addr_node)); | |
4045 | ||
4046 | return (q); | |
428870ff BB |
4047 | } |
4048 | ||
0ea05c64 | 4049 | /* |
d4a72f23 TC |
4050 | * Destroys a scan queue and all segments and scan_io_t's contained in it. |
4051 | * No further execution of I/O occurs, anything pending in the queue is | |
4052 | * simply freed without being executed. | |
0ea05c64 | 4053 | */ |
d4a72f23 TC |
4054 | void |
4055 | dsl_scan_io_queue_destroy(dsl_scan_io_queue_t *queue) | |
428870ff | 4056 | { |
d4a72f23 TC |
4057 | dsl_scan_t *scn = queue->q_scn; |
4058 | scan_io_t *sio; | |
4059 | void *cookie = NULL; | |
4060 | int64_t bytes_dequeued = 0; | |
4061 | ||
4062 | ASSERT(MUTEX_HELD(&queue->q_vd->vdev_scan_io_queue_lock)); | |
4063 | ||
4064 | while ((sio = avl_destroy_nodes(&queue->q_sios_by_addr, &cookie)) != | |
4065 | NULL) { | |
4066 | ASSERT(range_tree_contains(queue->q_exts_by_addr, | |
ab7615d9 TC |
4067 | SIO_GET_OFFSET(sio), SIO_GET_ASIZE(sio))); |
4068 | bytes_dequeued += SIO_GET_ASIZE(sio); | |
4069 | queue->q_sio_memused -= SIO_GET_MUSED(sio); | |
4070 | sio_free(sio); | |
d4a72f23 | 4071 | } |
428870ff | 4072 | |
ab7615d9 | 4073 | ASSERT0(queue->q_sio_memused); |
d4a72f23 TC |
4074 | atomic_add_64(&scn->scn_bytes_pending, -bytes_dequeued); |
4075 | range_tree_vacate(queue->q_exts_by_addr, NULL, queue); | |
4076 | range_tree_destroy(queue->q_exts_by_addr); | |
4077 | avl_destroy(&queue->q_sios_by_addr); | |
4078 | cv_destroy(&queue->q_zio_cv); | |
428870ff | 4079 | |
d4a72f23 TC |
4080 | kmem_free(queue, sizeof (*queue)); |
4081 | } | |
0ea05c64 | 4082 | |
d4a72f23 TC |
4083 | /* |
4084 | * Properly transfers a dsl_scan_queue_t from `svd' to `tvd'. This is | |
4085 | * called on behalf of vdev_top_transfer when creating or destroying | |
4086 | * a mirror vdev due to zpool attach/detach. | |
4087 | */ | |
4088 | void | |
4089 | dsl_scan_io_queue_vdev_xfer(vdev_t *svd, vdev_t *tvd) | |
4090 | { | |
4091 | mutex_enter(&svd->vdev_scan_io_queue_lock); | |
4092 | mutex_enter(&tvd->vdev_scan_io_queue_lock); | |
4093 | ||
4094 | VERIFY3P(tvd->vdev_scan_io_queue, ==, NULL); | |
4095 | tvd->vdev_scan_io_queue = svd->vdev_scan_io_queue; | |
4096 | svd->vdev_scan_io_queue = NULL; | |
a1d477c2 | 4097 | if (tvd->vdev_scan_io_queue != NULL) |
d4a72f23 | 4098 | tvd->vdev_scan_io_queue->q_vd = tvd; |
0ea05c64 | 4099 | |
d4a72f23 TC |
4100 | mutex_exit(&tvd->vdev_scan_io_queue_lock); |
4101 | mutex_exit(&svd->vdev_scan_io_queue_lock); | |
428870ff | 4102 | } |
c409e464 | 4103 | |
d4a72f23 TC |
4104 | static void |
4105 | scan_io_queues_destroy(dsl_scan_t *scn) | |
784d15c1 | 4106 | { |
d4a72f23 TC |
4107 | vdev_t *rvd = scn->scn_dp->dp_spa->spa_root_vdev; |
4108 | ||
4109 | for (uint64_t i = 0; i < rvd->vdev_children; i++) { | |
4110 | vdev_t *tvd = rvd->vdev_child[i]; | |
4111 | ||
4112 | mutex_enter(&tvd->vdev_scan_io_queue_lock); | |
4113 | if (tvd->vdev_scan_io_queue != NULL) | |
4114 | dsl_scan_io_queue_destroy(tvd->vdev_scan_io_queue); | |
4115 | tvd->vdev_scan_io_queue = NULL; | |
4116 | mutex_exit(&tvd->vdev_scan_io_queue_lock); | |
4117 | } | |
784d15c1 NR |
4118 | } |
4119 | ||
d4a72f23 TC |
4120 | static void |
4121 | dsl_scan_freed_dva(spa_t *spa, const blkptr_t *bp, int dva_i) | |
4122 | { | |
4123 | dsl_pool_t *dp = spa->spa_dsl_pool; | |
4124 | dsl_scan_t *scn = dp->dp_scan; | |
4125 | vdev_t *vdev; | |
4126 | kmutex_t *q_lock; | |
4127 | dsl_scan_io_queue_t *queue; | |
ab7615d9 | 4128 | scan_io_t *srch_sio, *sio; |
d4a72f23 TC |
4129 | avl_index_t idx; |
4130 | uint64_t start, size; | |
4131 | ||
4132 | vdev = vdev_lookup_top(spa, DVA_GET_VDEV(&bp->blk_dva[dva_i])); | |
4133 | ASSERT(vdev != NULL); | |
4134 | q_lock = &vdev->vdev_scan_io_queue_lock; | |
4135 | queue = vdev->vdev_scan_io_queue; | |
4136 | ||
4137 | mutex_enter(q_lock); | |
4138 | if (queue == NULL) { | |
4139 | mutex_exit(q_lock); | |
4140 | return; | |
4141 | } | |
4142 | ||
ab7615d9 TC |
4143 | srch_sio = sio_alloc(BP_GET_NDVAS(bp)); |
4144 | bp2sio(bp, srch_sio, dva_i); | |
4145 | start = SIO_GET_OFFSET(srch_sio); | |
4146 | size = SIO_GET_ASIZE(srch_sio); | |
d4a72f23 TC |
4147 | |
4148 | /* | |
4149 | * We can find the zio in two states: | |
4150 | * 1) Cold, just sitting in the queue of zio's to be issued at | |
4151 | * some point in the future. In this case, all we do is | |
4152 | * remove the zio from the q_sios_by_addr tree, decrement | |
4153 | * its data volume from the containing range_seg_t and | |
4154 | * resort the q_exts_by_size tree to reflect that the | |
4155 | * range_seg_t has lost some of its 'fill'. We don't shorten | |
4156 | * the range_seg_t - this is usually rare enough not to be | |
4157 | * worth the extra hassle of trying keep track of precise | |
4158 | * extent boundaries. | |
4159 | * 2) Hot, where the zio is currently in-flight in | |
4160 | * dsl_scan_issue_ios. In this case, we can't simply | |
4161 | * reach in and stop the in-flight zio's, so we instead | |
4162 | * block the caller. Eventually, dsl_scan_issue_ios will | |
4163 | * be done with issuing the zio's it gathered and will | |
4164 | * signal us. | |
4165 | */ | |
ab7615d9 TC |
4166 | sio = avl_find(&queue->q_sios_by_addr, srch_sio, &idx); |
4167 | sio_free(srch_sio); | |
4168 | ||
d4a72f23 | 4169 | if (sio != NULL) { |
ab7615d9 | 4170 | int64_t asize = SIO_GET_ASIZE(sio); |
d4a72f23 TC |
4171 | blkptr_t tmpbp; |
4172 | ||
4173 | /* Got it while it was cold in the queue */ | |
ab7615d9 | 4174 | ASSERT3U(start, ==, SIO_GET_OFFSET(sio)); |
d4a72f23 TC |
4175 | ASSERT3U(size, ==, asize); |
4176 | avl_remove(&queue->q_sios_by_addr, sio); | |
ab7615d9 | 4177 | queue->q_sio_memused -= SIO_GET_MUSED(sio); |
c409e464 | 4178 | |
d4a72f23 TC |
4179 | ASSERT(range_tree_contains(queue->q_exts_by_addr, start, size)); |
4180 | range_tree_remove_fill(queue->q_exts_by_addr, start, size); | |
4181 | ||
4182 | /* | |
4183 | * We only update scn_bytes_pending in the cold path, | |
4184 | * otherwise it will already have been accounted for as | |
4185 | * part of the zio's execution. | |
4186 | */ | |
4187 | atomic_add_64(&scn->scn_bytes_pending, -asize); | |
c409e464 | 4188 | |
d4a72f23 | 4189 | /* count the block as though we issued it */ |
ab7615d9 | 4190 | sio2bp(sio, &tmpbp); |
d4a72f23 | 4191 | count_block(scn, dp->dp_blkstats, &tmpbp); |
c409e464 | 4192 | |
ab7615d9 | 4193 | sio_free(sio); |
d4a72f23 TC |
4194 | } |
4195 | mutex_exit(q_lock); | |
4196 | } | |
c409e464 | 4197 | |
d4a72f23 TC |
4198 | /* |
4199 | * Callback invoked when a zio_free() zio is executing. This needs to be | |
4200 | * intercepted to prevent the zio from deallocating a particular portion | |
4201 | * of disk space and it then getting reallocated and written to, while we | |
4202 | * still have it queued up for processing. | |
4203 | */ | |
4204 | void | |
4205 | dsl_scan_freed(spa_t *spa, const blkptr_t *bp) | |
4206 | { | |
4207 | dsl_pool_t *dp = spa->spa_dsl_pool; | |
4208 | dsl_scan_t *scn = dp->dp_scan; | |
4209 | ||
4210 | ASSERT(!BP_IS_EMBEDDED(bp)); | |
4211 | ASSERT(scn != NULL); | |
4212 | if (!dsl_scan_is_running(scn)) | |
4213 | return; | |
4214 | ||
4215 | for (int i = 0; i < BP_GET_NDVAS(bp); i++) | |
4216 | dsl_scan_freed_dva(spa, bp, i); | |
4217 | } | |
4218 | ||
03fdcb9a MM |
4219 | /* BEGIN CSTYLED */ |
4220 | ZFS_MODULE_PARAM(zfs, zfs_, scan_vdev_limit, ULONG, ZMOD_RW, | |
d4a72f23 TC |
4221 | "Max bytes in flight per leaf vdev for scrubs and resilvers"); |
4222 | ||
03fdcb9a MM |
4223 | ZFS_MODULE_PARAM(zfs, zfs_, scrub_min_time_ms, INT, ZMOD_RW, |
4224 | "Min millisecs to scrub per txg"); | |
c409e464 | 4225 | |
03fdcb9a MM |
4226 | ZFS_MODULE_PARAM(zfs, zfs_, obsolete_min_time_ms, INT, ZMOD_RW, |
4227 | "Min millisecs to obsolete per txg"); | |
a1d477c2 | 4228 | |
03fdcb9a MM |
4229 | ZFS_MODULE_PARAM(zfs, zfs_, free_min_time_ms, INT, ZMOD_RW, |
4230 | "Min millisecs to free per txg"); | |
c409e464 | 4231 | |
03fdcb9a MM |
4232 | ZFS_MODULE_PARAM(zfs, zfs_, resilver_min_time_ms, INT, ZMOD_RW, |
4233 | "Min millisecs to resilver per txg"); | |
c409e464 | 4234 | |
03fdcb9a | 4235 | ZFS_MODULE_PARAM(zfs, zfs_, scan_suspend_progress, INT, ZMOD_RW, |
cef48f14 TC |
4236 | "Set to prevent scans from progressing"); |
4237 | ||
03fdcb9a MM |
4238 | ZFS_MODULE_PARAM(zfs, zfs_, no_scrub_io, INT, ZMOD_RW, |
4239 | "Set to disable scrub I/O"); | |
c409e464 | 4240 | |
03fdcb9a MM |
4241 | ZFS_MODULE_PARAM(zfs, zfs_, no_scrub_prefetch, INT, ZMOD_RW, |
4242 | "Set to disable scrub prefetching"); | |
36283ca2 | 4243 | |
03fdcb9a | 4244 | ZFS_MODULE_PARAM(zfs, zfs_, async_block_max_blocks, ULONG, ZMOD_RW, |
a1d477c2 | 4245 | "Max number of blocks freed in one txg"); |
ba5ad9a4 | 4246 | |
03fdcb9a MM |
4247 | ZFS_MODULE_PARAM(zfs, zfs_, free_bpobj_enabled, INT, ZMOD_RW, |
4248 | "Enable processing of the free_bpobj"); | |
d4a72f23 | 4249 | |
03fdcb9a MM |
4250 | ZFS_MODULE_PARAM(zfs, zfs_, scan_mem_lim_fact, INT, ZMOD_RW, |
4251 | "Fraction of RAM for scan hard limit"); | |
d4a72f23 | 4252 | |
03fdcb9a MM |
4253 | ZFS_MODULE_PARAM(zfs, zfs_, scan_issue_strategy, INT, ZMOD_RW, |
4254 | "IO issuing strategy during scrubbing. " | |
4255 | "0 = default, 1 = LBA, 2 = size"); | |
d4a72f23 | 4256 | |
03fdcb9a MM |
4257 | ZFS_MODULE_PARAM(zfs, zfs_, scan_legacy, INT, ZMOD_RW, |
4258 | "Scrub using legacy non-sequential method"); | |
d4a72f23 | 4259 | |
03fdcb9a | 4260 | ZFS_MODULE_PARAM(zfs, zfs_, scan_checkpoint_intval, INT, ZMOD_RW, |
d4a72f23 TC |
4261 | "Scan progress on-disk checkpointing interval"); |
4262 | ||
03fdcb9a | 4263 | ZFS_MODULE_PARAM(zfs, zfs_, scan_max_ext_gap, ULONG, ZMOD_RW, |
63f88c12 | 4264 | "Max gap in bytes between sequential scrub / resilver I/Os"); |
4265 | ||
03fdcb9a | 4266 | ZFS_MODULE_PARAM(zfs, zfs_, scan_mem_lim_soft_fact, INT, ZMOD_RW, |
d4a72f23 TC |
4267 | "Fraction of hard limit used as soft limit"); |
4268 | ||
03fdcb9a | 4269 | ZFS_MODULE_PARAM(zfs, zfs_, scan_strict_mem_lim, INT, ZMOD_RW, |
d4a72f23 TC |
4270 | "Tunable to attempt to reduce lock contention"); |
4271 | ||
03fdcb9a | 4272 | ZFS_MODULE_PARAM(zfs, zfs_, scan_fill_weight, INT, ZMOD_RW, |
d4a72f23 | 4273 | "Tunable to adjust bias towards more filled segments during scans"); |
80a91e74 | 4274 | |
03fdcb9a | 4275 | ZFS_MODULE_PARAM(zfs, zfs_, resilver_disable_defer, INT, ZMOD_RW, |
80a91e74 | 4276 | "Process all resilvers immediately"); |
03fdcb9a | 4277 | /* END CSTYLED */ |