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dsl_scan.c (332547) dsl_scan.c (339034)
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

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46#include <sys/vdev_impl.h>
47#include <sys/zil_impl.h>
48#include <sys/zio_checksum.h>
49#include <sys/ddt.h>
50#include <sys/sa.h>
51#include <sys/sa_impl.h>
52#include <sys/zfeature.h>
53#include <sys/abd.h>
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

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46#include <sys/vdev_impl.h>
47#include <sys/zil_impl.h>
48#include <sys/zio_checksum.h>
49#include <sys/ddt.h>
50#include <sys/sa.h>
51#include <sys/sa_impl.h>
52#include <sys/zfeature.h>
53#include <sys/abd.h>
54#include <sys/range_tree.h>
54#ifdef _KERNEL
55#include <sys/zfs_vfsops.h>
56#endif
57
55#ifdef _KERNEL
56#include <sys/zfs_vfsops.h>
57#endif
58
59/*
60 * Grand theory statement on scan queue sorting
61 *
62 * Scanning is implemented by recursively traversing all indirection levels
63 * in an object and reading all blocks referenced from said objects. This
64 * results in us approximately traversing the object from lowest logical
65 * offset to the highest. For best performance, we would want the logical
66 * blocks to be physically contiguous. However, this is frequently not the
67 * case with pools given the allocation patterns of copy-on-write filesystems.
68 * So instead, we put the I/Os into a reordering queue and issue them in a
69 * way that will most benefit physical disks (LBA-order).
70 *
71 * Queue management:
72 *
73 * Ideally, we would want to scan all metadata and queue up all block I/O
74 * prior to starting to issue it, because that allows us to do an optimal
75 * sorting job. This can however consume large amounts of memory. Therefore
76 * we continuously monitor the size of the queues and constrain them to 5%
77 * (zfs_scan_mem_lim_fact) of physmem. If the queues grow larger than this
78 * limit, we clear out a few of the largest extents at the head of the queues
79 * to make room for more scanning. Hopefully, these extents will be fairly
80 * large and contiguous, allowing us to approach sequential I/O throughput
81 * even without a fully sorted tree.
82 *
83 * Metadata scanning takes place in dsl_scan_visit(), which is called from
84 * dsl_scan_sync() every spa_sync(). If we have either fully scanned all
85 * metadata on the pool, or we need to make room in memory because our
86 * queues are too large, dsl_scan_visit() is postponed and
87 * scan_io_queues_run() is called from dsl_scan_sync() instead. This implies
88 * that metadata scanning and queued I/O issuing are mutually exclusive. This
89 * allows us to provide maximum sequential I/O throughput for the majority of
90 * I/O's issued since sequential I/O performance is significantly negatively
91 * impacted if it is interleaved with random I/O.
92 *
93 * Implementation Notes
94 *
95 * One side effect of the queued scanning algorithm is that the scanning code
96 * needs to be notified whenever a block is freed. This is needed to allow
97 * the scanning code to remove these I/Os from the issuing queue. Additionally,
98 * we do not attempt to queue gang blocks to be issued sequentially since this
99 * is very hard to do and would have an extremely limitted performance benefit.
100 * Instead, we simply issue gang I/Os as soon as we find them using the legacy
101 * algorithm.
102 *
103 * Backwards compatibility
104 *
105 * This new algorithm is backwards compatible with the legacy on-disk data
106 * structures (and therefore does not require a new feature flag).
107 * Periodically during scanning (see zfs_scan_checkpoint_intval), the scan
108 * will stop scanning metadata (in logical order) and wait for all outstanding
109 * sorted I/O to complete. Once this is done, we write out a checkpoint
110 * bookmark, indicating that we have scanned everything logically before it.
111 * If the pool is imported on a machine without the new sorting algorithm,
112 * the scan simply resumes from the last checkpoint using the legacy algorithm.
113 */
114
58typedef int (scan_cb_t)(dsl_pool_t *, const blkptr_t *,
59 const zbookmark_phys_t *);
60
61static scan_cb_t dsl_scan_scrub_cb;
115typedef int (scan_cb_t)(dsl_pool_t *, const blkptr_t *,
116 const zbookmark_phys_t *);
117
118static scan_cb_t dsl_scan_scrub_cb;
62static void dsl_scan_cancel_sync(void *, dmu_tx_t *);
63static void dsl_scan_sync_state(dsl_scan_t *, dmu_tx_t *);
64static boolean_t dsl_scan_restarting(dsl_scan_t *, dmu_tx_t *);
65
119
66unsigned int zfs_top_maxinflight = 32; /* maximum I/Os per top-level */
67unsigned int zfs_resilver_delay = 2; /* number of ticks to delay resilver */
68unsigned int zfs_scrub_delay = 4; /* number of ticks to delay scrub */
120static int scan_ds_queue_compare(const void *a, const void *b);
121static int scan_prefetch_queue_compare(const void *a, const void *b);
122static void scan_ds_queue_clear(dsl_scan_t *scn);
123static boolean_t scan_ds_queue_contains(dsl_scan_t *scn, uint64_t dsobj,
124 uint64_t *txg);
125static void scan_ds_queue_insert(dsl_scan_t *scn, uint64_t dsobj, uint64_t txg);
126static void scan_ds_queue_remove(dsl_scan_t *scn, uint64_t dsobj);
127static void scan_ds_queue_sync(dsl_scan_t *scn, dmu_tx_t *tx);
128
129extern int zfs_vdev_async_write_active_min_dirty_percent;
130
131/*
132 * By default zfs will check to ensure it is not over the hard memory
133 * limit before each txg. If finer-grained control of this is needed
134 * this value can be set to 1 to enable checking before scanning each
135 * block.
136 */
137int zfs_scan_strict_mem_lim = B_FALSE;
138
139/*
140 * Maximum number of parallelly executing I/Os per top-level vdev.
141 * Tune with care. Very high settings (hundreds) are known to trigger
142 * some firmware bugs and resets on certain SSDs.
143 */
144int zfs_top_maxinflight = 32; /* maximum I/Os per top-level */
145unsigned int zfs_resilver_delay = 2; /* number of ticks to delay resilver -- 2 is a good number */
146unsigned int zfs_scrub_delay = 4; /* number of ticks to delay scrub -- 4 is a good number */
69unsigned int zfs_scan_idle = 50; /* idle window in clock ticks */
70
147unsigned int zfs_scan_idle = 50; /* idle window in clock ticks */
148
71unsigned int zfs_scan_min_time_ms = 1000; /* min millisecs to scrub per txg */
149/*
150 * Maximum number of parallelly executed bytes per leaf vdev. We attempt
151 * to strike a balance here between keeping the vdev queues full of I/Os
152 * at all times and not overflowing the queues to cause long latency,
153 * which would cause long txg sync times. No matter what, we will not
154 * overload the drives with I/O, since that is protected by
155 * zfs_vdev_scrub_max_active.
156 */
157unsigned long zfs_scan_vdev_limit = 4 << 20;
158
159int zfs_scan_issue_strategy = 0;
160int zfs_scan_legacy = B_FALSE; /* don't queue & sort zios, go direct */
161uint64_t zfs_scan_max_ext_gap = 2 << 20; /* in bytes */
162
163unsigned int zfs_scan_checkpoint_intval = 7200; /* seconds */
164#define ZFS_SCAN_CHECKPOINT_INTVAL SEC_TO_TICK(zfs_scan_checkpoint_intval)
165
166/*
167 * fill_weight is non-tunable at runtime, so we copy it at module init from
168 * zfs_scan_fill_weight. Runtime adjustments to zfs_scan_fill_weight would
169 * break queue sorting.
170 */
171uint64_t zfs_scan_fill_weight = 3;
172static uint64_t fill_weight;
173
174/* See dsl_scan_should_clear() for details on the memory limit tunables */
175uint64_t zfs_scan_mem_lim_min = 16 << 20; /* bytes */
176uint64_t zfs_scan_mem_lim_soft_max = 128 << 20; /* bytes */
177int zfs_scan_mem_lim_fact = 20; /* fraction of physmem */
178int zfs_scan_mem_lim_soft_fact = 20; /* fraction of mem lim above */
179
180unsigned int zfs_scrub_min_time_ms = 1000; /* min millisecs to scrub per txg */
72unsigned int zfs_free_min_time_ms = 1000; /* min millisecs to free per txg */
73unsigned int zfs_obsolete_min_time_ms = 500; /* min millisecs to obsolete per txg */
181unsigned int zfs_free_min_time_ms = 1000; /* min millisecs to free per txg */
182unsigned int zfs_obsolete_min_time_ms = 500; /* min millisecs to obsolete per txg */
74unsigned int zfs_resilver_min_time_ms = 3000; /* min millisecs to resilver
75 per txg */
183unsigned int zfs_resilver_min_time_ms = 3000; /* min millisecs to resilver per txg */
76boolean_t zfs_no_scrub_io = B_FALSE; /* set to disable scrub i/o */
77boolean_t zfs_no_scrub_prefetch = B_FALSE; /* set to disable scrub prefetch */
78
79SYSCTL_DECL(_vfs_zfs);
80SYSCTL_UINT(_vfs_zfs, OID_AUTO, top_maxinflight, CTLFLAG_RWTUN,
81 &zfs_top_maxinflight, 0, "Maximum I/Os per top-level vdev");
82SYSCTL_UINT(_vfs_zfs, OID_AUTO, resilver_delay, CTLFLAG_RWTUN,
83 &zfs_resilver_delay, 0, "Number of ticks to delay resilver");
84SYSCTL_UINT(_vfs_zfs, OID_AUTO, scrub_delay, CTLFLAG_RWTUN,
85 &zfs_scrub_delay, 0, "Number of ticks to delay scrub");
86SYSCTL_UINT(_vfs_zfs, OID_AUTO, scan_idle, CTLFLAG_RWTUN,
87 &zfs_scan_idle, 0, "Idle scan window in clock ticks");
88SYSCTL_UINT(_vfs_zfs, OID_AUTO, scan_min_time_ms, CTLFLAG_RWTUN,
184boolean_t zfs_no_scrub_io = B_FALSE; /* set to disable scrub i/o */
185boolean_t zfs_no_scrub_prefetch = B_FALSE; /* set to disable scrub prefetch */
186
187SYSCTL_DECL(_vfs_zfs);
188SYSCTL_UINT(_vfs_zfs, OID_AUTO, top_maxinflight, CTLFLAG_RWTUN,
189 &zfs_top_maxinflight, 0, "Maximum I/Os per top-level vdev");
190SYSCTL_UINT(_vfs_zfs, OID_AUTO, resilver_delay, CTLFLAG_RWTUN,
191 &zfs_resilver_delay, 0, "Number of ticks to delay resilver");
192SYSCTL_UINT(_vfs_zfs, OID_AUTO, scrub_delay, CTLFLAG_RWTUN,
193 &zfs_scrub_delay, 0, "Number of ticks to delay scrub");
194SYSCTL_UINT(_vfs_zfs, OID_AUTO, scan_idle, CTLFLAG_RWTUN,
195 &zfs_scan_idle, 0, "Idle scan window in clock ticks");
196SYSCTL_UINT(_vfs_zfs, OID_AUTO, scan_min_time_ms, CTLFLAG_RWTUN,
89 &zfs_scan_min_time_ms, 0, "Min millisecs to scrub per txg");
197 &zfs_scrub_min_time_ms, 0, "Min millisecs to scrub per txg");
90SYSCTL_UINT(_vfs_zfs, OID_AUTO, free_min_time_ms, CTLFLAG_RWTUN,
91 &zfs_free_min_time_ms, 0, "Min millisecs to free per txg");
92SYSCTL_UINT(_vfs_zfs, OID_AUTO, resilver_min_time_ms, CTLFLAG_RWTUN,
93 &zfs_resilver_min_time_ms, 0, "Min millisecs to resilver per txg");
94SYSCTL_INT(_vfs_zfs, OID_AUTO, no_scrub_io, CTLFLAG_RWTUN,
95 &zfs_no_scrub_io, 0, "Disable scrub I/O");
96SYSCTL_INT(_vfs_zfs, OID_AUTO, no_scrub_prefetch, CTLFLAG_RWTUN,
97 &zfs_no_scrub_prefetch, 0, "Disable scrub prefetching");
198SYSCTL_UINT(_vfs_zfs, OID_AUTO, free_min_time_ms, CTLFLAG_RWTUN,
199 &zfs_free_min_time_ms, 0, "Min millisecs to free per txg");
200SYSCTL_UINT(_vfs_zfs, OID_AUTO, resilver_min_time_ms, CTLFLAG_RWTUN,
201 &zfs_resilver_min_time_ms, 0, "Min millisecs to resilver per txg");
202SYSCTL_INT(_vfs_zfs, OID_AUTO, no_scrub_io, CTLFLAG_RWTUN,
203 &zfs_no_scrub_io, 0, "Disable scrub I/O");
204SYSCTL_INT(_vfs_zfs, OID_AUTO, no_scrub_prefetch, CTLFLAG_RWTUN,
205 &zfs_no_scrub_prefetch, 0, "Disable scrub prefetching");
206SYSCTL_UINT(_vfs_zfs, OID_AUTO, zfs_scan_legacy, CTLFLAG_RWTUN,
207 &zfs_scan_legacy, 0, "Scrub using legacy non-sequential method");
208SYSCTL_UINT(_vfs_zfs, OID_AUTO, zfs_scan_checkpoint_interval, CTLFLAG_RWTUN,
209 &zfs_scan_checkpoint_intval, 0, "Scan progress on-disk checkpointing interval");
98
99enum ddt_class zfs_scrub_ddt_class_max = DDT_CLASS_DUPLICATE;
100/* max number of blocks to free in a single TXG */
101uint64_t zfs_async_block_max_blocks = UINT64_MAX;
102SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, free_max_blocks, CTLFLAG_RWTUN,
103 &zfs_async_block_max_blocks, 0, "Maximum number of blocks to free in one TXG");
104
210
211enum ddt_class zfs_scrub_ddt_class_max = DDT_CLASS_DUPLICATE;
212/* max number of blocks to free in a single TXG */
213uint64_t zfs_async_block_max_blocks = UINT64_MAX;
214SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, free_max_blocks, CTLFLAG_RWTUN,
215 &zfs_async_block_max_blocks, 0, "Maximum number of blocks to free in one TXG");
216
217/*
218 * We wait a few txgs after importing a pool to begin scanning so that
219 * the import / mounting code isn't held up by scrub / resilver IO.
220 * Unfortunately, it is a bit difficult to determine exactly how long
221 * this will take since userspace will trigger fs mounts asynchronously
222 * and the kernel will create zvol minors asynchronously. As a result,
223 * the value provided here is a bit arbitrary, but represents a
224 * reasonable estimate of how many txgs it will take to finish fully
225 * importing a pool
226 */
227#define SCAN_IMPORT_WAIT_TXGS 5
105
228
229
106#define DSL_SCAN_IS_SCRUB_RESILVER(scn) \
107 ((scn)->scn_phys.scn_func == POOL_SCAN_SCRUB || \
108 (scn)->scn_phys.scn_func == POOL_SCAN_RESILVER)
109
110extern int zfs_txg_timeout;
111
112/*
113 * Enable/disable the processing of the free_bpobj object.

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119
120/* the order has to match pool_scan_type */
121static scan_cb_t *scan_funcs[POOL_SCAN_FUNCS] = {
122 NULL,
123 dsl_scan_scrub_cb, /* POOL_SCAN_SCRUB */
124 dsl_scan_scrub_cb, /* POOL_SCAN_RESILVER */
125};
126
230#define DSL_SCAN_IS_SCRUB_RESILVER(scn) \
231 ((scn)->scn_phys.scn_func == POOL_SCAN_SCRUB || \
232 (scn)->scn_phys.scn_func == POOL_SCAN_RESILVER)
233
234extern int zfs_txg_timeout;
235
236/*
237 * Enable/disable the processing of the free_bpobj object.

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243
244/* the order has to match pool_scan_type */
245static scan_cb_t *scan_funcs[POOL_SCAN_FUNCS] = {
246 NULL,
247 dsl_scan_scrub_cb, /* POOL_SCAN_SCRUB */
248 dsl_scan_scrub_cb, /* POOL_SCAN_RESILVER */
249};
250
251/* In core node for the scn->scn_queue. Represents a dataset to be scanned */
252typedef struct {
253 uint64_t sds_dsobj;
254 uint64_t sds_txg;
255 avl_node_t sds_node;
256} scan_ds_t;
257
258/*
259 * This controls what conditions are placed on dsl_scan_sync_state():
260 * SYNC_OPTIONAL) write out scn_phys iff scn_bytes_pending == 0
261 * SYNC_MANDATORY) write out scn_phys always. scn_bytes_pending must be 0.
262 * SYNC_CACHED) if scn_bytes_pending == 0, write out scn_phys. Otherwise
263 * write out the scn_phys_cached version.
264 * See dsl_scan_sync_state for details.
265 */
266typedef enum {
267 SYNC_OPTIONAL,
268 SYNC_MANDATORY,
269 SYNC_CACHED
270} state_sync_type_t;
271
272/*
273 * This struct represents the minimum information needed to reconstruct a
274 * zio for sequential scanning. This is useful because many of these will
275 * accumulate in the sequential IO queues before being issued, so saving
276 * memory matters here.
277 */
278typedef struct scan_io {
279 /* fields from blkptr_t */
280 uint64_t sio_offset;
281 uint64_t sio_blk_prop;
282 uint64_t sio_phys_birth;
283 uint64_t sio_birth;
284 zio_cksum_t sio_cksum;
285 uint32_t sio_asize;
286
287 /* fields from zio_t */
288 int sio_flags;
289 zbookmark_phys_t sio_zb;
290
291 /* members for queue sorting */
292 union {
293 avl_node_t sio_addr_node; /* link into issueing queue */
294 list_node_t sio_list_node; /* link for issuing to disk */
295 } sio_nodes;
296} scan_io_t;
297
298struct dsl_scan_io_queue {
299 dsl_scan_t *q_scn; /* associated dsl_scan_t */
300 vdev_t *q_vd; /* top-level vdev that this queue represents */
301
302 /* trees used for sorting I/Os and extents of I/Os */
303 range_tree_t *q_exts_by_addr;
304 avl_tree_t q_exts_by_size;
305 avl_tree_t q_sios_by_addr;
306
307 /* members for zio rate limiting */
308 uint64_t q_maxinflight_bytes;
309 uint64_t q_inflight_bytes;
310 kcondvar_t q_zio_cv; /* used under vd->vdev_scan_io_queue_lock */
311
312 /* per txg statistics */
313 uint64_t q_total_seg_size_this_txg;
314 uint64_t q_segs_this_txg;
315 uint64_t q_total_zio_size_this_txg;
316 uint64_t q_zios_this_txg;
317};
318
319/* private data for dsl_scan_prefetch_cb() */
320typedef struct scan_prefetch_ctx {
321 refcount_t spc_refcnt; /* refcount for memory management */
322 dsl_scan_t *spc_scn; /* dsl_scan_t for the pool */
323 boolean_t spc_root; /* is this prefetch for an objset? */
324 uint8_t spc_indblkshift; /* dn_indblkshift of current dnode */
325 uint16_t spc_datablkszsec; /* dn_idatablkszsec of current dnode */
326} scan_prefetch_ctx_t;
327
328/* private data for dsl_scan_prefetch() */
329typedef struct scan_prefetch_issue_ctx {
330 avl_node_t spic_avl_node; /* link into scn->scn_prefetch_queue */
331 scan_prefetch_ctx_t *spic_spc; /* spc for the callback */
332 blkptr_t spic_bp; /* bp to prefetch */
333 zbookmark_phys_t spic_zb; /* bookmark to prefetch */
334} scan_prefetch_issue_ctx_t;
335
336static void scan_exec_io(dsl_pool_t *dp, const blkptr_t *bp, int zio_flags,
337 const zbookmark_phys_t *zb, dsl_scan_io_queue_t *queue);
338static void scan_io_queue_insert_impl(dsl_scan_io_queue_t *queue,
339 scan_io_t *sio);
340
341static dsl_scan_io_queue_t *scan_io_queue_create(vdev_t *vd);
342static void scan_io_queues_destroy(dsl_scan_t *scn);
343
344static kmem_cache_t *sio_cache;
345
346void
347scan_init(void)
348{
349 /*
350 * This is used in ext_size_compare() to weight segments
351 * based on how sparse they are. This cannot be changed
352 * mid-scan and the tree comparison functions don't currently
353 * have a mechansim for passing additional context to the
354 * compare functions. Thus we store this value globally and
355 * we only allow it to be set at module intiailization time
356 */
357 fill_weight = zfs_scan_fill_weight;
358
359 sio_cache = kmem_cache_create("sio_cache",
360 sizeof (scan_io_t), 0, NULL, NULL, NULL, NULL, NULL, 0);
361}
362
363void
364scan_fini(void)
365{
366 kmem_cache_destroy(sio_cache);
367}
368
369static inline boolean_t
370dsl_scan_is_running(const dsl_scan_t *scn)
371{
372 return (scn->scn_phys.scn_state == DSS_SCANNING);
373}
374
375boolean_t
376dsl_scan_resilvering(dsl_pool_t *dp)
377{
378 return (dsl_scan_is_running(dp->dp_scan) &&
379 dp->dp_scan->scn_phys.scn_func == POOL_SCAN_RESILVER);
380}
381
382static inline void
383sio2bp(const scan_io_t *sio, blkptr_t *bp, uint64_t vdev_id)
384{
385 bzero(bp, sizeof (*bp));
386 DVA_SET_ASIZE(&bp->blk_dva[0], sio->sio_asize);
387 DVA_SET_VDEV(&bp->blk_dva[0], vdev_id);
388 DVA_SET_OFFSET(&bp->blk_dva[0], sio->sio_offset);
389 bp->blk_prop = sio->sio_blk_prop;
390 bp->blk_phys_birth = sio->sio_phys_birth;
391 bp->blk_birth = sio->sio_birth;
392 bp->blk_fill = 1; /* we always only work with data pointers */
393 bp->blk_cksum = sio->sio_cksum;
394}
395
396static inline void
397bp2sio(const blkptr_t *bp, scan_io_t *sio, int dva_i)
398{
399 /* we discard the vdev id, since we can deduce it from the queue */
400 sio->sio_offset = DVA_GET_OFFSET(&bp->blk_dva[dva_i]);
401 sio->sio_asize = DVA_GET_ASIZE(&bp->blk_dva[dva_i]);
402 sio->sio_blk_prop = bp->blk_prop;
403 sio->sio_phys_birth = bp->blk_phys_birth;
404 sio->sio_birth = bp->blk_birth;
405 sio->sio_cksum = bp->blk_cksum;
406}
407
408void
409dsl_scan_global_init(void)
410{
411 /*
412 * This is used in ext_size_compare() to weight segments
413 * based on how sparse they are. This cannot be changed
414 * mid-scan and the tree comparison functions don't currently
415 * have a mechansim for passing additional context to the
416 * compare functions. Thus we store this value globally and
417 * we only allow it to be set at module intiailization time
418 */
419 fill_weight = zfs_scan_fill_weight;
420}
421
127int
128dsl_scan_init(dsl_pool_t *dp, uint64_t txg)
129{
130 int err;
131 dsl_scan_t *scn;
132 spa_t *spa = dp->dp_spa;
133 uint64_t f;
134

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139 * It's possible that we're resuming a scan after a reboot so
140 * make sure that the scan_async_destroying flag is initialized
141 * appropriately.
142 */
143 ASSERT(!scn->scn_async_destroying);
144 scn->scn_async_destroying = spa_feature_is_active(dp->dp_spa,
145 SPA_FEATURE_ASYNC_DESTROY);
146
422int
423dsl_scan_init(dsl_pool_t *dp, uint64_t txg)
424{
425 int err;
426 dsl_scan_t *scn;
427 spa_t *spa = dp->dp_spa;
428 uint64_t f;
429

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434 * It's possible that we're resuming a scan after a reboot so
435 * make sure that the scan_async_destroying flag is initialized
436 * appropriately.
437 */
438 ASSERT(!scn->scn_async_destroying);
439 scn->scn_async_destroying = spa_feature_is_active(dp->dp_spa,
440 SPA_FEATURE_ASYNC_DESTROY);
441
442 bcopy(&scn->scn_phys, &scn->scn_phys_cached, sizeof (scn->scn_phys));
443 avl_create(&scn->scn_queue, scan_ds_queue_compare, sizeof (scan_ds_t),
444 offsetof(scan_ds_t, sds_node));
445 avl_create(&scn->scn_prefetch_queue, scan_prefetch_queue_compare,
446 sizeof (scan_prefetch_issue_ctx_t),
447 offsetof(scan_prefetch_issue_ctx_t, spic_avl_node));
448
147 err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
148 "scrub_func", sizeof (uint64_t), 1, &f);
149 if (err == 0) {
150 /*
151 * There was an old-style scrub in progress. Restart a
152 * new-style scrub from the beginning.
153 */
154 scn->scn_restart_txg = txg;
155 zfs_dbgmsg("old-style scrub was in progress; "
156 "restarting new-style scrub in txg %llu",
449 err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
450 "scrub_func", sizeof (uint64_t), 1, &f);
451 if (err == 0) {
452 /*
453 * There was an old-style scrub in progress. Restart a
454 * new-style scrub from the beginning.
455 */
456 scn->scn_restart_txg = txg;
457 zfs_dbgmsg("old-style scrub was in progress; "
458 "restarting new-style scrub in txg %llu",
157 scn->scn_restart_txg);
459 (longlong_t)scn->scn_restart_txg);
158
159 /*
160 * Load the queue obj from the old location so that it
161 * can be freed by dsl_scan_done().
162 */
163 (void) zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
164 "scrub_queue", sizeof (uint64_t), 1,
165 &scn->scn_phys.scn_queue_obj);
166 } else {
167 err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
168 DMU_POOL_SCAN, sizeof (uint64_t), SCAN_PHYS_NUMINTS,
169 &scn->scn_phys);
170 if (err == ENOENT)
171 return (0);
172 else if (err)
173 return (err);
174
460
461 /*
462 * Load the queue obj from the old location so that it
463 * can be freed by dsl_scan_done().
464 */
465 (void) zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
466 "scrub_queue", sizeof (uint64_t), 1,
467 &scn->scn_phys.scn_queue_obj);
468 } else {
469 err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
470 DMU_POOL_SCAN, sizeof (uint64_t), SCAN_PHYS_NUMINTS,
471 &scn->scn_phys);
472 if (err == ENOENT)
473 return (0);
474 else if (err)
475 return (err);
476
175 if (scn->scn_phys.scn_state == DSS_SCANNING &&
477 /*
478 * We might be restarting after a reboot, so jump the issued
479 * counter to how far we've scanned. We know we're consistent
480 * up to here.
481 */
482 scn->scn_issued_before_pass = scn->scn_phys.scn_examined;
483
484 if (dsl_scan_is_running(scn) &&
176 spa_prev_software_version(dp->dp_spa) < SPA_VERSION_SCAN) {
177 /*
178 * A new-type scrub was in progress on an old
179 * pool, and the pool was accessed by old
180 * software. Restart from the beginning, since
181 * the old software may have changed the pool in
182 * the meantime.
183 */
184 scn->scn_restart_txg = txg;
185 zfs_dbgmsg("new-style scrub was modified "
186 "by old software; restarting in txg %llu",
485 spa_prev_software_version(dp->dp_spa) < SPA_VERSION_SCAN) {
486 /*
487 * A new-type scrub was in progress on an old
488 * pool, and the pool was accessed by old
489 * software. Restart from the beginning, since
490 * the old software may have changed the pool in
491 * the meantime.
492 */
493 scn->scn_restart_txg = txg;
494 zfs_dbgmsg("new-style scrub was modified "
495 "by old software; restarting in txg %llu",
187 scn->scn_restart_txg);
496 (longlong_t)scn->scn_restart_txg);
188 }
189 }
190
497 }
498 }
499
500 /* reload the queue into the in-core state */
501 if (scn->scn_phys.scn_queue_obj != 0) {
502 zap_cursor_t zc;
503 zap_attribute_t za;
504
505 for (zap_cursor_init(&zc, dp->dp_meta_objset,
506 scn->scn_phys.scn_queue_obj);
507 zap_cursor_retrieve(&zc, &za) == 0;
508 (void) zap_cursor_advance(&zc)) {
509 scan_ds_queue_insert(scn,
510 zfs_strtonum(za.za_name, NULL),
511 za.za_first_integer);
512 }
513 zap_cursor_fini(&zc);
514 }
515
191 spa_scan_stat_init(spa);
192 return (0);
193}
194
195void
196dsl_scan_fini(dsl_pool_t *dp)
197{
516 spa_scan_stat_init(spa);
517 return (0);
518}
519
520void
521dsl_scan_fini(dsl_pool_t *dp)
522{
198 if (dp->dp_scan) {
523 if (dp->dp_scan != NULL) {
524 dsl_scan_t *scn = dp->dp_scan;
525
526 if (scn->scn_taskq != NULL)
527 taskq_destroy(scn->scn_taskq);
528 scan_ds_queue_clear(scn);
529 avl_destroy(&scn->scn_queue);
530 avl_destroy(&scn->scn_prefetch_queue);
531
199 kmem_free(dp->dp_scan, sizeof (dsl_scan_t));
200 dp->dp_scan = NULL;
201 }
202}
203
532 kmem_free(dp->dp_scan, sizeof (dsl_scan_t));
533 dp->dp_scan = NULL;
534 }
535}
536
537static boolean_t
538dsl_scan_restarting(dsl_scan_t *scn, dmu_tx_t *tx)
539{
540 return (scn->scn_restart_txg != 0 &&
541 scn->scn_restart_txg <= tx->tx_txg);
542}
543
544boolean_t
545dsl_scan_scrubbing(const dsl_pool_t *dp)
546{
547 dsl_scan_phys_t *scn_phys = &dp->dp_scan->scn_phys;
548
549 return (scn_phys->scn_state == DSS_SCANNING &&
550 scn_phys->scn_func == POOL_SCAN_SCRUB);
551}
552
553boolean_t
554dsl_scan_is_paused_scrub(const dsl_scan_t *scn)
555{
556 return (dsl_scan_scrubbing(scn->scn_dp) &&
557 scn->scn_phys.scn_flags & DSF_SCRUB_PAUSED);
558}
559
560/*
561 * Writes out a persistent dsl_scan_phys_t record to the pool directory.
562 * Because we can be running in the block sorting algorithm, we do not always
563 * want to write out the record, only when it is "safe" to do so. This safety
564 * condition is achieved by making sure that the sorting queues are empty
565 * (scn_bytes_pending == 0). When this condition is not true, the sync'd state
566 * is inconsistent with how much actual scanning progress has been made. The
567 * kind of sync to be performed is specified by the sync_type argument. If the
568 * sync is optional, we only sync if the queues are empty. If the sync is
569 * mandatory, we do a hard ASSERT to make sure that the queues are empty. The
570 * third possible state is a "cached" sync. This is done in response to:
571 * 1) The dataset that was in the last sync'd dsl_scan_phys_t having been
572 * destroyed, so we wouldn't be able to restart scanning from it.
573 * 2) The snapshot that was in the last sync'd dsl_scan_phys_t having been
574 * superseded by a newer snapshot.
575 * 3) The dataset that was in the last sync'd dsl_scan_phys_t having been
576 * swapped with its clone.
577 * In all cases, a cached sync simply rewrites the last record we've written,
578 * just slightly modified. For the modifications that are performed to the
579 * last written dsl_scan_phys_t, see dsl_scan_ds_destroyed,
580 * dsl_scan_ds_snapshotted and dsl_scan_ds_clone_swapped.
581 */
582static void
583dsl_scan_sync_state(dsl_scan_t *scn, dmu_tx_t *tx, state_sync_type_t sync_type)
584{
585 int i;
586 spa_t *spa = scn->scn_dp->dp_spa;
587
588 ASSERT(sync_type != SYNC_MANDATORY || scn->scn_bytes_pending == 0);
589 if (scn->scn_bytes_pending == 0) {
590 for (i = 0; i < spa->spa_root_vdev->vdev_children; i++) {
591 vdev_t *vd = spa->spa_root_vdev->vdev_child[i];
592 dsl_scan_io_queue_t *q = vd->vdev_scan_io_queue;
593
594 if (q == NULL)
595 continue;
596
597 mutex_enter(&vd->vdev_scan_io_queue_lock);
598 ASSERT3P(avl_first(&q->q_sios_by_addr), ==, NULL);
599 ASSERT3P(avl_first(&q->q_exts_by_size), ==, NULL);
600 ASSERT3P(range_tree_first(q->q_exts_by_addr), ==, NULL);
601 mutex_exit(&vd->vdev_scan_io_queue_lock);
602 }
603
604 if (scn->scn_phys.scn_queue_obj != 0)
605 scan_ds_queue_sync(scn, tx);
606 VERIFY0(zap_update(scn->scn_dp->dp_meta_objset,
607 DMU_POOL_DIRECTORY_OBJECT,
608 DMU_POOL_SCAN, sizeof (uint64_t), SCAN_PHYS_NUMINTS,
609 &scn->scn_phys, tx));
610 bcopy(&scn->scn_phys, &scn->scn_phys_cached,
611 sizeof (scn->scn_phys));
612
613 if (scn->scn_checkpointing)
614 zfs_dbgmsg("finish scan checkpoint");
615
616 scn->scn_checkpointing = B_FALSE;
617 scn->scn_last_checkpoint = ddi_get_lbolt();
618 } else if (sync_type == SYNC_CACHED) {
619 VERIFY0(zap_update(scn->scn_dp->dp_meta_objset,
620 DMU_POOL_DIRECTORY_OBJECT,
621 DMU_POOL_SCAN, sizeof (uint64_t), SCAN_PHYS_NUMINTS,
622 &scn->scn_phys_cached, tx));
623 }
624}
625
204/* ARGSUSED */
205static int
206dsl_scan_setup_check(void *arg, dmu_tx_t *tx)
207{
208 dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan;
209
626/* ARGSUSED */
627static int
628dsl_scan_setup_check(void *arg, dmu_tx_t *tx)
629{
630 dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan;
631
210 if (scn->scn_phys.scn_state == DSS_SCANNING)
632 if (dsl_scan_is_running(scn))
211 return (SET_ERROR(EBUSY));
212
213 return (0);
214}
215
216static void
217dsl_scan_setup_sync(void *arg, dmu_tx_t *tx)
218{
219 dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan;
220 pool_scan_func_t *funcp = arg;
221 dmu_object_type_t ot = 0;
222 dsl_pool_t *dp = scn->scn_dp;
223 spa_t *spa = dp->dp_spa;
224
633 return (SET_ERROR(EBUSY));
634
635 return (0);
636}
637
638static void
639dsl_scan_setup_sync(void *arg, dmu_tx_t *tx)
640{
641 dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan;
642 pool_scan_func_t *funcp = arg;
643 dmu_object_type_t ot = 0;
644 dsl_pool_t *dp = scn->scn_dp;
645 spa_t *spa = dp->dp_spa;
646
225 ASSERT(scn->scn_phys.scn_state != DSS_SCANNING);
647 ASSERT(!dsl_scan_is_running(scn));
226 ASSERT(*funcp > POOL_SCAN_NONE && *funcp < POOL_SCAN_FUNCS);
227 bzero(&scn->scn_phys, sizeof (scn->scn_phys));
228 scn->scn_phys.scn_func = *funcp;
229 scn->scn_phys.scn_state = DSS_SCANNING;
230 scn->scn_phys.scn_min_txg = 0;
231 scn->scn_phys.scn_max_txg = tx->tx_txg;
232 scn->scn_phys.scn_ddt_class_max = DDT_CLASSES - 1; /* the entire DDT */
233 scn->scn_phys.scn_start_time = gethrestime_sec();
234 scn->scn_phys.scn_errors = 0;
235 scn->scn_phys.scn_to_examine = spa->spa_root_vdev->vdev_stat.vs_alloc;
648 ASSERT(*funcp > POOL_SCAN_NONE && *funcp < POOL_SCAN_FUNCS);
649 bzero(&scn->scn_phys, sizeof (scn->scn_phys));
650 scn->scn_phys.scn_func = *funcp;
651 scn->scn_phys.scn_state = DSS_SCANNING;
652 scn->scn_phys.scn_min_txg = 0;
653 scn->scn_phys.scn_max_txg = tx->tx_txg;
654 scn->scn_phys.scn_ddt_class_max = DDT_CLASSES - 1; /* the entire DDT */
655 scn->scn_phys.scn_start_time = gethrestime_sec();
656 scn->scn_phys.scn_errors = 0;
657 scn->scn_phys.scn_to_examine = spa->spa_root_vdev->vdev_stat.vs_alloc;
658 scn->scn_issued_before_pass = 0;
236 scn->scn_restart_txg = 0;
237 scn->scn_done_txg = 0;
659 scn->scn_restart_txg = 0;
660 scn->scn_done_txg = 0;
661 scn->scn_last_checkpoint = 0;
662 scn->scn_checkpointing = B_FALSE;
238 spa_scan_stat_init(spa);
239
240 if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) {
241 scn->scn_phys.scn_ddt_class_max = zfs_scrub_ddt_class_max;
242
243 /* rewrite all disk labels */
244 vdev_config_dirty(spa->spa_root_vdev);
245

--- 16 unchanged lines hidden (view full) ---

262
263 }
264
265 /* back to the generic stuff */
266
267 if (dp->dp_blkstats == NULL) {
268 dp->dp_blkstats =
269 kmem_alloc(sizeof (zfs_all_blkstats_t), KM_SLEEP);
663 spa_scan_stat_init(spa);
664
665 if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) {
666 scn->scn_phys.scn_ddt_class_max = zfs_scrub_ddt_class_max;
667
668 /* rewrite all disk labels */
669 vdev_config_dirty(spa->spa_root_vdev);
670

--- 16 unchanged lines hidden (view full) ---

687
688 }
689
690 /* back to the generic stuff */
691
692 if (dp->dp_blkstats == NULL) {
693 dp->dp_blkstats =
694 kmem_alloc(sizeof (zfs_all_blkstats_t), KM_SLEEP);
695 mutex_init(&dp->dp_blkstats->zab_lock, NULL,
696 MUTEX_DEFAULT, NULL);
270 }
697 }
271 bzero(dp->dp_blkstats, sizeof (zfs_all_blkstats_t));
698 bzero(&dp->dp_blkstats->zab_type, sizeof (dp->dp_blkstats->zab_type));
272
273 if (spa_version(spa) < SPA_VERSION_DSL_SCRUB)
274 ot = DMU_OT_ZAP_OTHER;
275
276 scn->scn_phys.scn_queue_obj = zap_create(dp->dp_meta_objset,
277 ot ? ot : DMU_OT_SCAN_QUEUE, DMU_OT_NONE, 0, tx);
278
699
700 if (spa_version(spa) < SPA_VERSION_DSL_SCRUB)
701 ot = DMU_OT_ZAP_OTHER;
702
703 scn->scn_phys.scn_queue_obj = zap_create(dp->dp_meta_objset,
704 ot ? ot : DMU_OT_SCAN_QUEUE, DMU_OT_NONE, 0, tx);
705
279 dsl_scan_sync_state(scn, tx);
706 bcopy(&scn->scn_phys, &scn->scn_phys_cached, sizeof (scn->scn_phys));
280
707
708 dsl_scan_sync_state(scn, tx, SYNC_MANDATORY);
709
281 spa_history_log_internal(spa, "scan setup", tx,
282 "func=%u mintxg=%llu maxtxg=%llu",
283 *funcp, scn->scn_phys.scn_min_txg, scn->scn_phys.scn_max_txg);
284}
285
710 spa_history_log_internal(spa, "scan setup", tx,
711 "func=%u mintxg=%llu maxtxg=%llu",
712 *funcp, scn->scn_phys.scn_min_txg, scn->scn_phys.scn_max_txg);
713}
714
715/*
716 * Called by the ZFS_IOC_POOL_SCAN ioctl to start a scrub or resilver.
717 * Can also be called to resume a paused scrub.
718 */
719int
720dsl_scan(dsl_pool_t *dp, pool_scan_func_t func)
721{
722 spa_t *spa = dp->dp_spa;
723 dsl_scan_t *scn = dp->dp_scan;
724
725 /*
726 * Purge all vdev caches and probe all devices. We do this here
727 * rather than in sync context because this requires a writer lock
728 * on the spa_config lock, which we can't do from sync context. The
729 * spa_scrub_reopen flag indicates that vdev_open() should not
730 * attempt to start another scrub.
731 */
732 spa_vdev_state_enter(spa, SCL_NONE);
733 spa->spa_scrub_reopen = B_TRUE;
734 vdev_reopen(spa->spa_root_vdev);
735 spa->spa_scrub_reopen = B_FALSE;
736 (void) spa_vdev_state_exit(spa, NULL, 0);
737
738 if (func == POOL_SCAN_SCRUB && dsl_scan_is_paused_scrub(scn)) {
739 /* got scrub start cmd, resume paused scrub */
740 int err = dsl_scrub_set_pause_resume(scn->scn_dp,
741 POOL_SCRUB_NORMAL);
742 if (err == 0) {
743 spa_event_notify(spa, NULL, NULL, ESC_ZFS_SCRUB_RESUME);
744 return (ECANCELED);
745 }
746 return (SET_ERROR(err));
747 }
748
749 return (dsl_sync_task(spa_name(spa), dsl_scan_setup_check,
750 dsl_scan_setup_sync, &func, 0, ZFS_SPACE_CHECK_EXTRA_RESERVED));
751}
752
286/* ARGSUSED */
287static void
288dsl_scan_done(dsl_scan_t *scn, boolean_t complete, dmu_tx_t *tx)
289{
290 static const char *old_names[] = {
291 "scrub_bookmark",
292 "scrub_ddt_bookmark",
293 "scrub_ddt_class_max",

--- 11 unchanged lines hidden (view full) ---

305
306 /* Remove any remnants of an old-style scrub. */
307 for (i = 0; old_names[i]; i++) {
308 (void) zap_remove(dp->dp_meta_objset,
309 DMU_POOL_DIRECTORY_OBJECT, old_names[i], tx);
310 }
311
312 if (scn->scn_phys.scn_queue_obj != 0) {
753/* ARGSUSED */
754static void
755dsl_scan_done(dsl_scan_t *scn, boolean_t complete, dmu_tx_t *tx)
756{
757 static const char *old_names[] = {
758 "scrub_bookmark",
759 "scrub_ddt_bookmark",
760 "scrub_ddt_class_max",

--- 11 unchanged lines hidden (view full) ---

772
773 /* Remove any remnants of an old-style scrub. */
774 for (i = 0; old_names[i]; i++) {
775 (void) zap_remove(dp->dp_meta_objset,
776 DMU_POOL_DIRECTORY_OBJECT, old_names[i], tx);
777 }
778
779 if (scn->scn_phys.scn_queue_obj != 0) {
313 VERIFY(0 == dmu_object_free(dp->dp_meta_objset,
780 VERIFY0(dmu_object_free(dp->dp_meta_objset,
314 scn->scn_phys.scn_queue_obj, tx));
315 scn->scn_phys.scn_queue_obj = 0;
316 }
781 scn->scn_phys.scn_queue_obj, tx));
782 scn->scn_phys.scn_queue_obj = 0;
783 }
784 scan_ds_queue_clear(scn);
317
318 scn->scn_phys.scn_flags &= ~DSF_SCRUB_PAUSED;
319
320 /*
321 * If we were "restarted" from a stopped state, don't bother
322 * with anything else.
323 */
785
786 scn->scn_phys.scn_flags &= ~DSF_SCRUB_PAUSED;
787
788 /*
789 * If we were "restarted" from a stopped state, don't bother
790 * with anything else.
791 */
324 if (scn->scn_phys.scn_state != DSS_SCANNING)
792 if (!dsl_scan_is_running(scn)) {
793 ASSERT(!scn->scn_is_sorted);
325 return;
794 return;
795 }
326
796
327 if (complete)
328 scn->scn_phys.scn_state = DSS_FINISHED;
329 else
330 scn->scn_phys.scn_state = DSS_CANCELED;
797 if (scn->scn_is_sorted) {
798 scan_io_queues_destroy(scn);
799 scn->scn_is_sorted = B_FALSE;
331
800
801 if (scn->scn_taskq != NULL) {
802 taskq_destroy(scn->scn_taskq);
803 scn->scn_taskq = NULL;
804 }
805 }
806
807 scn->scn_phys.scn_state = complete ? DSS_FINISHED : DSS_CANCELED;
808
332 if (dsl_scan_restarting(scn, tx))
333 spa_history_log_internal(spa, "scan aborted, restarting", tx,
334 "errors=%llu", spa_get_errlog_size(spa));
335 else if (!complete)
336 spa_history_log_internal(spa, "scan cancelled", tx,
337 "errors=%llu", spa_get_errlog_size(spa));
338 else
339 spa_history_log_internal(spa, "scan done", tx,
340 "errors=%llu", spa_get_errlog_size(spa));
341
342 if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) {
809 if (dsl_scan_restarting(scn, tx))
810 spa_history_log_internal(spa, "scan aborted, restarting", tx,
811 "errors=%llu", spa_get_errlog_size(spa));
812 else if (!complete)
813 spa_history_log_internal(spa, "scan cancelled", tx,
814 "errors=%llu", spa_get_errlog_size(spa));
815 else
816 spa_history_log_internal(spa, "scan done", tx,
817 "errors=%llu", spa_get_errlog_size(spa));
818
819 if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) {
343 mutex_enter(&spa->spa_scrub_lock);
344 while (spa->spa_scrub_inflight > 0) {
345 cv_wait(&spa->spa_scrub_io_cv,
346 &spa->spa_scrub_lock);
347 }
348 mutex_exit(&spa->spa_scrub_lock);
349 spa->spa_scrub_started = B_FALSE;
350 spa->spa_scrub_active = B_FALSE;
351
352 /*
353 * If the scrub/resilver completed, update all DTLs to
354 * reflect this. Whether it succeeded or not, vacate
355 * all temporary scrub DTLs.
356 *

--- 19 unchanged lines hidden (view full) ---

376 /*
377 * We may have finished replacing a device.
378 * Let the async thread assess this and handle the detach.
379 */
380 spa_async_request(spa, SPA_ASYNC_RESILVER_DONE);
381 }
382
383 scn->scn_phys.scn_end_time = gethrestime_sec();
820 spa->spa_scrub_started = B_FALSE;
821 spa->spa_scrub_active = B_FALSE;
822
823 /*
824 * If the scrub/resilver completed, update all DTLs to
825 * reflect this. Whether it succeeded or not, vacate
826 * all temporary scrub DTLs.
827 *

--- 19 unchanged lines hidden (view full) ---

847 /*
848 * We may have finished replacing a device.
849 * Let the async thread assess this and handle the detach.
850 */
851 spa_async_request(spa, SPA_ASYNC_RESILVER_DONE);
852 }
853
854 scn->scn_phys.scn_end_time = gethrestime_sec();
855
856 ASSERT(!dsl_scan_is_running(scn));
384}
385
386/* ARGSUSED */
387static int
388dsl_scan_cancel_check(void *arg, dmu_tx_t *tx)
389{
390 dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan;
391
857}
858
859/* ARGSUSED */
860static int
861dsl_scan_cancel_check(void *arg, dmu_tx_t *tx)
862{
863 dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan;
864
392 if (scn->scn_phys.scn_state != DSS_SCANNING)
865 if (!dsl_scan_is_running(scn))
393 return (SET_ERROR(ENOENT));
394 return (0);
395}
396
397/* ARGSUSED */
398static void
399dsl_scan_cancel_sync(void *arg, dmu_tx_t *tx)
400{
401 dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan;
402
403 dsl_scan_done(scn, B_FALSE, tx);
866 return (SET_ERROR(ENOENT));
867 return (0);
868}
869
870/* ARGSUSED */
871static void
872dsl_scan_cancel_sync(void *arg, dmu_tx_t *tx)
873{
874 dsl_scan_t *scn = dmu_tx_pool(tx)->dp_scan;
875
876 dsl_scan_done(scn, B_FALSE, tx);
404 dsl_scan_sync_state(scn, tx);
877 dsl_scan_sync_state(scn, tx, SYNC_MANDATORY);
405 spa_event_notify(scn->scn_dp->dp_spa, NULL, NULL, ESC_ZFS_SCRUB_ABORT);
406}
407
408int
409dsl_scan_cancel(dsl_pool_t *dp)
410{
411 return (dsl_sync_task(spa_name(dp->dp_spa), dsl_scan_cancel_check,
412 dsl_scan_cancel_sync, NULL, 3, ZFS_SPACE_CHECK_RESERVED));
413}
414
878 spa_event_notify(scn->scn_dp->dp_spa, NULL, NULL, ESC_ZFS_SCRUB_ABORT);
879}
880
881int
882dsl_scan_cancel(dsl_pool_t *dp)
883{
884 return (dsl_sync_task(spa_name(dp->dp_spa), dsl_scan_cancel_check,
885 dsl_scan_cancel_sync, NULL, 3, ZFS_SPACE_CHECK_RESERVED));
886}
887
415boolean_t
416dsl_scan_is_paused_scrub(const dsl_scan_t *scn)
417{
418 if (dsl_scan_scrubbing(scn->scn_dp) &&
419 scn->scn_phys.scn_flags & DSF_SCRUB_PAUSED)
420 return (B_TRUE);
421
422 return (B_FALSE);
423}
424
425static int
426dsl_scrub_pause_resume_check(void *arg, dmu_tx_t *tx)
427{
428 pool_scrub_cmd_t *cmd = arg;
429 dsl_pool_t *dp = dmu_tx_pool(tx);
430 dsl_scan_t *scn = dp->dp_scan;
431
432 if (*cmd == POOL_SCRUB_PAUSE) {

--- 18 unchanged lines hidden (view full) ---

451 dsl_pool_t *dp = dmu_tx_pool(tx);
452 spa_t *spa = dp->dp_spa;
453 dsl_scan_t *scn = dp->dp_scan;
454
455 if (*cmd == POOL_SCRUB_PAUSE) {
456 /* can't pause a scrub when there is no in-progress scrub */
457 spa->spa_scan_pass_scrub_pause = gethrestime_sec();
458 scn->scn_phys.scn_flags |= DSF_SCRUB_PAUSED;
888static int
889dsl_scrub_pause_resume_check(void *arg, dmu_tx_t *tx)
890{
891 pool_scrub_cmd_t *cmd = arg;
892 dsl_pool_t *dp = dmu_tx_pool(tx);
893 dsl_scan_t *scn = dp->dp_scan;
894
895 if (*cmd == POOL_SCRUB_PAUSE) {

--- 18 unchanged lines hidden (view full) ---

914 dsl_pool_t *dp = dmu_tx_pool(tx);
915 spa_t *spa = dp->dp_spa;
916 dsl_scan_t *scn = dp->dp_scan;
917
918 if (*cmd == POOL_SCRUB_PAUSE) {
919 /* can't pause a scrub when there is no in-progress scrub */
920 spa->spa_scan_pass_scrub_pause = gethrestime_sec();
921 scn->scn_phys.scn_flags |= DSF_SCRUB_PAUSED;
459 dsl_scan_sync_state(scn, tx);
922 dsl_scan_sync_state(scn, tx, SYNC_CACHED);
460 spa_event_notify(spa, NULL, NULL, ESC_ZFS_SCRUB_PAUSED);
461 } else {
462 ASSERT3U(*cmd, ==, POOL_SCRUB_NORMAL);
463 if (dsl_scan_is_paused_scrub(scn)) {
464 /*
465 * We need to keep track of how much time we spend
466 * paused per pass so that we can adjust the scrub rate
467 * shown in the output of 'zpool status'
468 */
469 spa->spa_scan_pass_scrub_spent_paused +=
470 gethrestime_sec() - spa->spa_scan_pass_scrub_pause;
471 spa->spa_scan_pass_scrub_pause = 0;
472 scn->scn_phys.scn_flags &= ~DSF_SCRUB_PAUSED;
923 spa_event_notify(spa, NULL, NULL, ESC_ZFS_SCRUB_PAUSED);
924 } else {
925 ASSERT3U(*cmd, ==, POOL_SCRUB_NORMAL);
926 if (dsl_scan_is_paused_scrub(scn)) {
927 /*
928 * We need to keep track of how much time we spend
929 * paused per pass so that we can adjust the scrub rate
930 * shown in the output of 'zpool status'
931 */
932 spa->spa_scan_pass_scrub_spent_paused +=
933 gethrestime_sec() - spa->spa_scan_pass_scrub_pause;
934 spa->spa_scan_pass_scrub_pause = 0;
935 scn->scn_phys.scn_flags &= ~DSF_SCRUB_PAUSED;
473 dsl_scan_sync_state(scn, tx);
936 dsl_scan_sync_state(scn, tx, SYNC_CACHED);
474 }
475 }
476}
477
478/*
479 * Set scrub pause/resume state if it makes sense to do so
480 */
481int
482dsl_scrub_set_pause_resume(const dsl_pool_t *dp, pool_scrub_cmd_t cmd)
483{
484 return (dsl_sync_task(spa_name(dp->dp_spa),
485 dsl_scrub_pause_resume_check, dsl_scrub_pause_resume_sync, &cmd, 3,
486 ZFS_SPACE_CHECK_RESERVED));
487}
488
937 }
938 }
939}
940
941/*
942 * Set scrub pause/resume state if it makes sense to do so
943 */
944int
945dsl_scrub_set_pause_resume(const dsl_pool_t *dp, pool_scrub_cmd_t cmd)
946{
947 return (dsl_sync_task(spa_name(dp->dp_spa),
948 dsl_scrub_pause_resume_check, dsl_scrub_pause_resume_sync, &cmd, 3,
949 ZFS_SPACE_CHECK_RESERVED));
950}
951
489boolean_t
490dsl_scan_scrubbing(const dsl_pool_t *dp)
952
953/* start a new scan, or restart an existing one. */
954void
955dsl_resilver_restart(dsl_pool_t *dp, uint64_t txg)
491{
956{
492 dsl_scan_t *scn = dp->dp_scan;
957 if (txg == 0) {
958 dmu_tx_t *tx;
959 tx = dmu_tx_create_dd(dp->dp_mos_dir);
960 VERIFY(0 == dmu_tx_assign(tx, TXG_WAIT));
493
961
494 if (scn->scn_phys.scn_state == DSS_SCANNING &&
495 scn->scn_phys.scn_func == POOL_SCAN_SCRUB)
496 return (B_TRUE);
497
498 return (B_FALSE);
962 txg = dmu_tx_get_txg(tx);
963 dp->dp_scan->scn_restart_txg = txg;
964 dmu_tx_commit(tx);
965 } else {
966 dp->dp_scan->scn_restart_txg = txg;
967 }
968 zfs_dbgmsg("restarting resilver txg=%llu", txg);
499}
500
969}
970
501static void dsl_scan_visitbp(blkptr_t *bp, const zbookmark_phys_t *zb,
502 dnode_phys_t *dnp, dsl_dataset_t *ds, dsl_scan_t *scn,
503 dmu_objset_type_t ostype, dmu_tx_t *tx);
504static void dsl_scan_visitdnode(dsl_scan_t *, dsl_dataset_t *ds,
505 dmu_objset_type_t ostype,
506 dnode_phys_t *dnp, uint64_t object, dmu_tx_t *tx);
507
508void
509dsl_free(dsl_pool_t *dp, uint64_t txg, const blkptr_t *bp)
510{
511 zio_free(dp->dp_spa, txg, bp);
512}
513
514void
515dsl_free_sync(zio_t *pio, dsl_pool_t *dp, uint64_t txg, const blkptr_t *bpp)
516{
517 ASSERT(dsl_pool_sync_context(dp));
518 zio_nowait(zio_free_sync(pio, dp->dp_spa, txg, bpp, BP_GET_PSIZE(bpp),
519 pio->io_flags));
520}
521
971void
972dsl_free(dsl_pool_t *dp, uint64_t txg, const blkptr_t *bp)
973{
974 zio_free(dp->dp_spa, txg, bp);
975}
976
977void
978dsl_free_sync(zio_t *pio, dsl_pool_t *dp, uint64_t txg, const blkptr_t *bpp)
979{
980 ASSERT(dsl_pool_sync_context(dp));
981 zio_nowait(zio_free_sync(pio, dp->dp_spa, txg, bpp, BP_GET_PSIZE(bpp),
982 pio->io_flags));
983}
984
522static uint64_t
523dsl_scan_ds_maxtxg(dsl_dataset_t *ds)
985static int
986scan_ds_queue_compare(const void *a, const void *b)
524{
987{
525 uint64_t smt = ds->ds_dir->dd_pool->dp_scan->scn_phys.scn_max_txg;
526 if (ds->ds_is_snapshot)
527 return (MIN(smt, dsl_dataset_phys(ds)->ds_creation_txg));
528 return (smt);
988 const scan_ds_t *sds_a = a, *sds_b = b;
989
990 if (sds_a->sds_dsobj < sds_b->sds_dsobj)
991 return (-1);
992 if (sds_a->sds_dsobj == sds_b->sds_dsobj)
993 return (0);
994 return (1);
529}
530
531static void
995}
996
997static void
532dsl_scan_sync_state(dsl_scan_t *scn, dmu_tx_t *tx)
998scan_ds_queue_clear(dsl_scan_t *scn)
533{
999{
534 VERIFY0(zap_update(scn->scn_dp->dp_meta_objset,
535 DMU_POOL_DIRECTORY_OBJECT,
536 DMU_POOL_SCAN, sizeof (uint64_t), SCAN_PHYS_NUMINTS,
537 &scn->scn_phys, tx));
1000 void *cookie = NULL;
1001 scan_ds_t *sds;
1002 while ((sds = avl_destroy_nodes(&scn->scn_queue, &cookie)) != NULL) {
1003 kmem_free(sds, sizeof (*sds));
1004 }
538}
539
1005}
1006
540extern int zfs_vdev_async_write_active_min_dirty_percent;
1007static boolean_t
1008scan_ds_queue_contains(dsl_scan_t *scn, uint64_t dsobj, uint64_t *txg)
1009{
1010 scan_ds_t srch, *sds;
541
1011
1012 srch.sds_dsobj = dsobj;
1013 sds = avl_find(&scn->scn_queue, &srch, NULL);
1014 if (sds != NULL && txg != NULL)
1015 *txg = sds->sds_txg;
1016 return (sds != NULL);
1017}
1018
1019static void
1020scan_ds_queue_insert(dsl_scan_t *scn, uint64_t dsobj, uint64_t txg)
1021{
1022 scan_ds_t *sds;
1023 avl_index_t where;
1024
1025 sds = kmem_zalloc(sizeof (*sds), KM_SLEEP);
1026 sds->sds_dsobj = dsobj;
1027 sds->sds_txg = txg;
1028
1029 VERIFY3P(avl_find(&scn->scn_queue, sds, &where), ==, NULL);
1030 avl_insert(&scn->scn_queue, sds, where);
1031}
1032
1033static void
1034scan_ds_queue_remove(dsl_scan_t *scn, uint64_t dsobj)
1035{
1036 scan_ds_t srch, *sds;
1037
1038 srch.sds_dsobj = dsobj;
1039
1040 sds = avl_find(&scn->scn_queue, &srch, NULL);
1041 VERIFY(sds != NULL);
1042 avl_remove(&scn->scn_queue, sds);
1043 kmem_free(sds, sizeof (*sds));
1044}
1045
1046static void
1047scan_ds_queue_sync(dsl_scan_t *scn, dmu_tx_t *tx)
1048{
1049 dsl_pool_t *dp = scn->scn_dp;
1050 spa_t *spa = dp->dp_spa;
1051 dmu_object_type_t ot = (spa_version(spa) >= SPA_VERSION_DSL_SCRUB) ?
1052 DMU_OT_SCAN_QUEUE : DMU_OT_ZAP_OTHER;
1053
1054 ASSERT0(scn->scn_bytes_pending);
1055 ASSERT(scn->scn_phys.scn_queue_obj != 0);
1056
1057 VERIFY0(dmu_object_free(dp->dp_meta_objset,
1058 scn->scn_phys.scn_queue_obj, tx));
1059 scn->scn_phys.scn_queue_obj = zap_create(dp->dp_meta_objset, ot,
1060 DMU_OT_NONE, 0, tx);
1061 for (scan_ds_t *sds = avl_first(&scn->scn_queue);
1062 sds != NULL; sds = AVL_NEXT(&scn->scn_queue, sds)) {
1063 VERIFY0(zap_add_int_key(dp->dp_meta_objset,
1064 scn->scn_phys.scn_queue_obj, sds->sds_dsobj,
1065 sds->sds_txg, tx));
1066 }
1067}
1068
1069/*
1070 * Computes the memory limit state that we're currently in. A sorted scan
1071 * needs quite a bit of memory to hold the sorting queue, so we need to
1072 * reasonably constrain the size so it doesn't impact overall system
1073 * performance. We compute two limits:
1074 * 1) Hard memory limit: if the amount of memory used by the sorting
1075 * queues on a pool gets above this value, we stop the metadata
1076 * scanning portion and start issuing the queued up and sorted
1077 * I/Os to reduce memory usage.
1078 * This limit is calculated as a fraction of physmem (by default 5%).
1079 * We constrain the lower bound of the hard limit to an absolute
1080 * minimum of zfs_scan_mem_lim_min (default: 16 MiB). We also constrain
1081 * the upper bound to 5% of the total pool size - no chance we'll
1082 * ever need that much memory, but just to keep the value in check.
1083 * 2) Soft memory limit: once we hit the hard memory limit, we start
1084 * issuing I/O to reduce queue memory usage, but we don't want to
1085 * completely empty out the queues, since we might be able to find I/Os
1086 * that will fill in the gaps of our non-sequential IOs at some point
1087 * in the future. So we stop the issuing of I/Os once the amount of
1088 * memory used drops below the soft limit (at which point we stop issuing
1089 * I/O and start scanning metadata again).
1090 *
1091 * This limit is calculated by subtracting a fraction of the hard
1092 * limit from the hard limit. By default this fraction is 5%, so
1093 * the soft limit is 95% of the hard limit. We cap the size of the
1094 * difference between the hard and soft limits at an absolute
1095 * maximum of zfs_scan_mem_lim_soft_max (default: 128 MiB) - this is
1096 * sufficient to not cause too frequent switching between the
1097 * metadata scan and I/O issue (even at 2k recordsize, 128 MiB's
1098 * worth of queues is about 1.2 GiB of on-pool data, so scanning
1099 * that should take at least a decent fraction of a second).
1100 */
542static boolean_t
1101static boolean_t
1102dsl_scan_should_clear(dsl_scan_t *scn)
1103{
1104 vdev_t *rvd = scn->scn_dp->dp_spa->spa_root_vdev;
1105 uint64_t mlim_hard, mlim_soft, mused;
1106 uint64_t alloc = metaslab_class_get_alloc(spa_normal_class(
1107 scn->scn_dp->dp_spa));
1108
1109 mlim_hard = MAX((physmem / zfs_scan_mem_lim_fact) * PAGESIZE,
1110 zfs_scan_mem_lim_min);
1111 mlim_hard = MIN(mlim_hard, alloc / 20);
1112 mlim_soft = mlim_hard - MIN(mlim_hard / zfs_scan_mem_lim_soft_fact,
1113 zfs_scan_mem_lim_soft_max);
1114 mused = 0;
1115 for (uint64_t i = 0; i < rvd->vdev_children; i++) {
1116 vdev_t *tvd = rvd->vdev_child[i];
1117 dsl_scan_io_queue_t *queue;
1118
1119 mutex_enter(&tvd->vdev_scan_io_queue_lock);
1120 queue = tvd->vdev_scan_io_queue;
1121 if (queue != NULL) {
1122 /* #extents in exts_by_size = # in exts_by_addr */
1123 mused += avl_numnodes(&queue->q_exts_by_size) *
1124 sizeof (range_seg_t) +
1125 avl_numnodes(&queue->q_sios_by_addr) *
1126 sizeof (scan_io_t);
1127 }
1128 mutex_exit(&tvd->vdev_scan_io_queue_lock);
1129 }
1130
1131 dprintf("current scan memory usage: %llu bytes\n", (longlong_t)mused);
1132
1133 if (mused == 0)
1134 ASSERT0(scn->scn_bytes_pending);
1135
1136 /*
1137 * If we are above our hard limit, we need to clear out memory.
1138 * If we are below our soft limit, we need to accumulate sequential IOs.
1139 * Otherwise, we should keep doing whatever we are currently doing.
1140 */
1141 if (mused >= mlim_hard)
1142 return (B_TRUE);
1143 else if (mused < mlim_soft)
1144 return (B_FALSE);
1145 else
1146 return (scn->scn_clearing);
1147}
1148
1149static boolean_t
543dsl_scan_check_suspend(dsl_scan_t *scn, const zbookmark_phys_t *zb)
544{
545 /* we never skip user/group accounting objects */
546 if (zb && (int64_t)zb->zb_object < 0)
547 return (B_FALSE);
548
549 if (scn->scn_suspending)
550 return (B_TRUE); /* we're already suspending */
551
552 if (!ZB_IS_ZERO(&scn->scn_phys.scn_bookmark))
553 return (B_FALSE); /* we're resuming */
554
555 /* We only know how to resume from level-0 blocks. */
556 if (zb && zb->zb_level != 0)
557 return (B_FALSE);
558
559 /*
560 * We suspend if:
1150dsl_scan_check_suspend(dsl_scan_t *scn, const zbookmark_phys_t *zb)
1151{
1152 /* we never skip user/group accounting objects */
1153 if (zb && (int64_t)zb->zb_object < 0)
1154 return (B_FALSE);
1155
1156 if (scn->scn_suspending)
1157 return (B_TRUE); /* we're already suspending */
1158
1159 if (!ZB_IS_ZERO(&scn->scn_phys.scn_bookmark))
1160 return (B_FALSE); /* we're resuming */
1161
1162 /* We only know how to resume from level-0 blocks. */
1163 if (zb && zb->zb_level != 0)
1164 return (B_FALSE);
1165
1166 /*
1167 * We suspend if:
561 * - we have scanned for the maximum time: an entire txg
562 * timeout (default 5 sec)
563 * or
564 * - we have scanned for at least the minimum time (default 1 sec
565 * for scrub, 3 sec for resilver), and either we have sufficient
566 * dirty data that we are starting to write more quickly
567 * (default 30%), or someone is explicitly waiting for this txg
568 * to complete.
569 * or
570 * - the spa is shutting down because this pool is being exported
571 * or the machine is rebooting.
1168 * - we have scanned for at least the minimum time (default 1 sec
1169 * for scrub, 3 sec for resilver), and either we have sufficient
1170 * dirty data that we are starting to write more quickly
1171 * (default 30%), or someone is explicitly waiting for this txg
1172 * to complete.
1173 * or
1174 * - the spa is shutting down because this pool is being exported
1175 * or the machine is rebooting.
1176 * or
1177 * - the scan queue has reached its memory use limit
572 */
1178 */
573 int mintime = (scn->scn_phys.scn_func == POOL_SCAN_RESILVER) ?
574 zfs_resilver_min_time_ms : zfs_scan_min_time_ms;
575 uint64_t elapsed_nanosecs = gethrtime() - scn->scn_sync_start_time;
1179 uint64_t elapsed_nanosecs = gethrtime();
1180 uint64_t curr_time_ns = gethrtime();
1181 uint64_t scan_time_ns = curr_time_ns - scn->scn_sync_start_time;
1182 uint64_t sync_time_ns = curr_time_ns -
1183 scn->scn_dp->dp_spa->spa_sync_starttime;
1184
576 int dirty_pct = scn->scn_dp->dp_dirty_total * 100 / zfs_dirty_data_max;
1185 int dirty_pct = scn->scn_dp->dp_dirty_total * 100 / zfs_dirty_data_max;
577 if (elapsed_nanosecs / NANOSEC >= zfs_txg_timeout ||
578 (NSEC2MSEC(elapsed_nanosecs) > mintime &&
579 (txg_sync_waiting(scn->scn_dp) ||
580 dirty_pct >= zfs_vdev_async_write_active_min_dirty_percent)) ||
581 spa_shutting_down(scn->scn_dp->dp_spa)) {
1186 int mintime = (scn->scn_phys.scn_func == POOL_SCAN_RESILVER) ?
1187 zfs_resilver_min_time_ms : zfs_scrub_min_time_ms;
1188
1189 if ((NSEC2MSEC(scan_time_ns) > mintime &&
1190 (dirty_pct >= zfs_vdev_async_write_active_min_dirty_percent ||
1191 txg_sync_waiting(scn->scn_dp) ||
1192 NSEC2SEC(sync_time_ns) >= zfs_txg_timeout)) ||
1193 spa_shutting_down(scn->scn_dp->dp_spa) ||
1194 (zfs_scan_strict_mem_lim && dsl_scan_should_clear(scn))) {
582 if (zb) {
583 dprintf("suspending at bookmark %llx/%llx/%llx/%llx\n",
584 (longlong_t)zb->zb_objset,
585 (longlong_t)zb->zb_object,
586 (longlong_t)zb->zb_level,
587 (longlong_t)zb->zb_blkid);
588 scn->scn_phys.scn_bookmark = *zb;
1195 if (zb) {
1196 dprintf("suspending at bookmark %llx/%llx/%llx/%llx\n",
1197 (longlong_t)zb->zb_objset,
1198 (longlong_t)zb->zb_object,
1199 (longlong_t)zb->zb_level,
1200 (longlong_t)zb->zb_blkid);
1201 scn->scn_phys.scn_bookmark = *zb;
1202 } else {
1203 dsl_scan_phys_t *scnp = &scn->scn_phys;
1204
1205 dprintf("suspending at at DDT bookmark "
1206 "%llx/%llx/%llx/%llx\n",
1207 (longlong_t)scnp->scn_ddt_bookmark.ddb_class,
1208 (longlong_t)scnp->scn_ddt_bookmark.ddb_type,
1209 (longlong_t)scnp->scn_ddt_bookmark.ddb_checksum,
1210 (longlong_t)scnp->scn_ddt_bookmark.ddb_cursor);
589 }
1211 }
590 dprintf("suspending at DDT bookmark %llx/%llx/%llx/%llx\n",
591 (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_class,
592 (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_type,
593 (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_checksum,
594 (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_cursor);
595 scn->scn_suspending = B_TRUE;
596 return (B_TRUE);
597 }
598 return (B_FALSE);
599}
600
601typedef struct zil_scan_arg {
602 dsl_pool_t *zsa_dp;

--- 82 unchanged lines hidden (view full) ---

685 zilog = zil_alloc(dp->dp_meta_objset, zh);
686
687 (void) zil_parse(zilog, dsl_scan_zil_block, dsl_scan_zil_record, &zsa,
688 claim_txg);
689
690 zil_free(zilog);
691}
692
1212 scn->scn_suspending = B_TRUE;
1213 return (B_TRUE);
1214 }
1215 return (B_FALSE);
1216}
1217
1218typedef struct zil_scan_arg {
1219 dsl_pool_t *zsa_dp;

--- 82 unchanged lines hidden (view full) ---

1302 zilog = zil_alloc(dp->dp_meta_objset, zh);
1303
1304 (void) zil_parse(zilog, dsl_scan_zil_block, dsl_scan_zil_record, &zsa,
1305 claim_txg);
1306
1307 zil_free(zilog);
1308}
1309
693/* ARGSUSED */
1310/*
1311 * We compare scan_prefetch_issue_ctx_t's based on their bookmarks. The idea
1312 * here is to sort the AVL tree by the order each block will be needed.
1313 */
1314static int
1315scan_prefetch_queue_compare(const void *a, const void *b)
1316{
1317 const scan_prefetch_issue_ctx_t *spic_a = a, *spic_b = b;
1318 const scan_prefetch_ctx_t *spc_a = spic_a->spic_spc;
1319 const scan_prefetch_ctx_t *spc_b = spic_b->spic_spc;
1320
1321 return (zbookmark_compare(spc_a->spc_datablkszsec,
1322 spc_a->spc_indblkshift, spc_b->spc_datablkszsec,
1323 spc_b->spc_indblkshift, &spic_a->spic_zb, &spic_b->spic_zb));
1324}
1325
694static void
1326static void
695dsl_scan_prefetch(dsl_scan_t *scn, arc_buf_t *buf, blkptr_t *bp,
696 uint64_t objset, uint64_t object, uint64_t blkid)
1327scan_prefetch_ctx_rele(scan_prefetch_ctx_t *spc, void *tag)
697{
1328{
698 zbookmark_phys_t czb;
699 arc_flags_t flags = ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH;
1329 if (refcount_remove(&spc->spc_refcnt, tag) == 0) {
1330 refcount_destroy(&spc->spc_refcnt);
1331 kmem_free(spc, sizeof (scan_prefetch_ctx_t));
1332 }
1333}
700
1334
1335static scan_prefetch_ctx_t *
1336scan_prefetch_ctx_create(dsl_scan_t *scn, dnode_phys_t *dnp, void *tag)
1337{
1338 scan_prefetch_ctx_t *spc;
1339
1340 spc = kmem_alloc(sizeof (scan_prefetch_ctx_t), KM_SLEEP);
1341 refcount_create(&spc->spc_refcnt);
1342 refcount_add(&spc->spc_refcnt, tag);
1343 spc->spc_scn = scn;
1344 if (dnp != NULL) {
1345 spc->spc_datablkszsec = dnp->dn_datablkszsec;
1346 spc->spc_indblkshift = dnp->dn_indblkshift;
1347 spc->spc_root = B_FALSE;
1348 } else {
1349 spc->spc_datablkszsec = 0;
1350 spc->spc_indblkshift = 0;
1351 spc->spc_root = B_TRUE;
1352 }
1353
1354 return (spc);
1355}
1356
1357static void
1358scan_prefetch_ctx_add_ref(scan_prefetch_ctx_t *spc, void *tag)
1359{
1360 refcount_add(&spc->spc_refcnt, tag);
1361}
1362
1363static boolean_t
1364dsl_scan_check_prefetch_resume(scan_prefetch_ctx_t *spc,
1365 const zbookmark_phys_t *zb)
1366{
1367 zbookmark_phys_t *last_zb = &spc->spc_scn->scn_prefetch_bookmark;
1368 dnode_phys_t tmp_dnp;
1369 dnode_phys_t *dnp = (spc->spc_root) ? NULL : &tmp_dnp;
1370
1371 if (zb->zb_objset != last_zb->zb_objset)
1372 return (B_TRUE);
1373 if ((int64_t)zb->zb_object < 0)
1374 return (B_FALSE);
1375
1376 tmp_dnp.dn_datablkszsec = spc->spc_datablkszsec;
1377 tmp_dnp.dn_indblkshift = spc->spc_indblkshift;
1378
1379 if (zbookmark_subtree_completed(dnp, zb, last_zb))
1380 return (B_TRUE);
1381
1382 return (B_FALSE);
1383}
1384
1385static void
1386dsl_scan_prefetch(scan_prefetch_ctx_t *spc, blkptr_t *bp, zbookmark_phys_t *zb)
1387{
1388 avl_index_t idx;
1389 dsl_scan_t *scn = spc->spc_scn;
1390 spa_t *spa = scn->scn_dp->dp_spa;
1391 scan_prefetch_issue_ctx_t *spic;
1392
701 if (zfs_no_scrub_prefetch)
702 return;
703
1393 if (zfs_no_scrub_prefetch)
1394 return;
1395
704 if (BP_IS_HOLE(bp) || bp->blk_birth <= scn->scn_phys.scn_min_txg ||
705 (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_DNODE))
1396 if (BP_IS_HOLE(bp) || bp->blk_birth <= scn->scn_phys.scn_cur_min_txg ||
1397 (BP_GET_LEVEL(bp) == 0 && BP_GET_TYPE(bp) != DMU_OT_DNODE &&
1398 BP_GET_TYPE(bp) != DMU_OT_OBJSET))
706 return;
707
1399 return;
1400
708 SET_BOOKMARK(&czb, objset, object, BP_GET_LEVEL(bp), blkid);
1401 if (dsl_scan_check_prefetch_resume(spc, zb))
1402 return;
709
1403
710 (void) arc_read(scn->scn_zio_root, scn->scn_dp->dp_spa, bp,
711 NULL, NULL, ZIO_PRIORITY_ASYNC_READ,
712 ZIO_FLAG_CANFAIL | ZIO_FLAG_SCAN_THREAD, &flags, &czb);
1404 scan_prefetch_ctx_add_ref(spc, scn);
1405 spic = kmem_alloc(sizeof (scan_prefetch_issue_ctx_t), KM_SLEEP);
1406 spic->spic_spc = spc;
1407 spic->spic_bp = *bp;
1408 spic->spic_zb = *zb;
1409
1410 /*
1411 * Add the IO to the queue of blocks to prefetch. This allows us to
1412 * prioritize blocks that we will need first for the main traversal
1413 * thread.
1414 */
1415 mutex_enter(&spa->spa_scrub_lock);
1416 if (avl_find(&scn->scn_prefetch_queue, spic, &idx) != NULL) {
1417 /* this block is already queued for prefetch */
1418 kmem_free(spic, sizeof (scan_prefetch_issue_ctx_t));
1419 scan_prefetch_ctx_rele(spc, scn);
1420 mutex_exit(&spa->spa_scrub_lock);
1421 return;
1422 }
1423
1424 avl_insert(&scn->scn_prefetch_queue, spic, idx);
1425 cv_broadcast(&spa->spa_scrub_io_cv);
1426 mutex_exit(&spa->spa_scrub_lock);
713}
714
1427}
1428
1429static void
1430dsl_scan_prefetch_dnode(dsl_scan_t *scn, dnode_phys_t *dnp,
1431 uint64_t objset, uint64_t object)
1432{
1433 int i;
1434 zbookmark_phys_t zb;
1435 scan_prefetch_ctx_t *spc;
1436
1437 if (dnp->dn_nblkptr == 0 && !(dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR))
1438 return;
1439
1440 SET_BOOKMARK(&zb, objset, object, 0, 0);
1441
1442 spc = scan_prefetch_ctx_create(scn, dnp, FTAG);
1443
1444 for (i = 0; i < dnp->dn_nblkptr; i++) {
1445 zb.zb_level = BP_GET_LEVEL(&dnp->dn_blkptr[i]);
1446 zb.zb_blkid = i;
1447 dsl_scan_prefetch(spc, &dnp->dn_blkptr[i], &zb);
1448 }
1449
1450 if (dnp->dn_flags & DNODE_FLAG_SPILL_BLKPTR) {
1451 zb.zb_level = 0;
1452 zb.zb_blkid = DMU_SPILL_BLKID;
1453 dsl_scan_prefetch(spc, &dnp->dn_spill, &zb);
1454 }
1455
1456 scan_prefetch_ctx_rele(spc, FTAG);
1457}
1458
1459void
1460dsl_scan_prefetch_cb(zio_t *zio, const zbookmark_phys_t *zb, const blkptr_t *bp,
1461 arc_buf_t *buf, void *private)
1462{
1463 scan_prefetch_ctx_t *spc = private;
1464 dsl_scan_t *scn = spc->spc_scn;
1465 spa_t *spa = scn->scn_dp->dp_spa;
1466
1467 /* broadcast that the IO has completed for rate limitting purposes */
1468 mutex_enter(&spa->spa_scrub_lock);
1469 ASSERT3U(spa->spa_scrub_inflight, >=, BP_GET_PSIZE(bp));
1470 spa->spa_scrub_inflight -= BP_GET_PSIZE(bp);
1471 cv_broadcast(&spa->spa_scrub_io_cv);
1472 mutex_exit(&spa->spa_scrub_lock);
1473
1474 /* if there was an error or we are done prefetching, just cleanup */
1475 if (buf == NULL || scn->scn_suspending)
1476 goto out;
1477
1478 if (BP_GET_LEVEL(bp) > 0) {
1479 int i;
1480 blkptr_t *cbp;
1481 int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT;
1482 zbookmark_phys_t czb;
1483
1484 for (i = 0, cbp = buf->b_data; i < epb; i++, cbp++) {
1485 SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object,
1486 zb->zb_level - 1, zb->zb_blkid * epb + i);
1487 dsl_scan_prefetch(spc, cbp, &czb);
1488 }
1489 } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) {
1490 dnode_phys_t *cdnp = buf->b_data;
1491 int i;
1492 int epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT;
1493
1494 for (i = 0, cdnp = buf->b_data; i < epb; i++, cdnp++) {
1495 dsl_scan_prefetch_dnode(scn, cdnp,
1496 zb->zb_objset, zb->zb_blkid * epb + i);
1497 }
1498 } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) {
1499 objset_phys_t *osp = buf->b_data;
1500
1501 dsl_scan_prefetch_dnode(scn, &osp->os_meta_dnode,
1502 zb->zb_objset, DMU_META_DNODE_OBJECT);
1503
1504 if (OBJSET_BUF_HAS_USERUSED(buf)) {
1505 dsl_scan_prefetch_dnode(scn,
1506 &osp->os_groupused_dnode, zb->zb_objset,
1507 DMU_GROUPUSED_OBJECT);
1508 dsl_scan_prefetch_dnode(scn,
1509 &osp->os_userused_dnode, zb->zb_objset,
1510 DMU_USERUSED_OBJECT);
1511 }
1512 }
1513
1514out:
1515 if (buf != NULL)
1516 arc_buf_destroy(buf, private);
1517 scan_prefetch_ctx_rele(spc, scn);
1518}
1519
1520/* ARGSUSED */
1521static void
1522dsl_scan_prefetch_thread(void *arg)
1523{
1524 dsl_scan_t *scn = arg;
1525 spa_t *spa = scn->scn_dp->dp_spa;
1526 vdev_t *rvd = spa->spa_root_vdev;
1527 uint64_t maxinflight = rvd->vdev_children * zfs_top_maxinflight;
1528 scan_prefetch_issue_ctx_t *spic;
1529
1530 /* loop until we are told to stop */
1531 while (!scn->scn_prefetch_stop) {
1532 arc_flags_t flags = ARC_FLAG_NOWAIT |
1533 ARC_FLAG_PRESCIENT_PREFETCH | ARC_FLAG_PREFETCH;
1534 int zio_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_SCAN_THREAD;
1535
1536 mutex_enter(&spa->spa_scrub_lock);
1537
1538 /*
1539 * Wait until we have an IO to issue and are not above our
1540 * maximum in flight limit.
1541 */
1542 while (!scn->scn_prefetch_stop &&
1543 (avl_numnodes(&scn->scn_prefetch_queue) == 0 ||
1544 spa->spa_scrub_inflight >= scn->scn_maxinflight_bytes)) {
1545 cv_wait(&spa->spa_scrub_io_cv, &spa->spa_scrub_lock);
1546 }
1547
1548 /* recheck if we should stop since we waited for the cv */
1549 if (scn->scn_prefetch_stop) {
1550 mutex_exit(&spa->spa_scrub_lock);
1551 break;
1552 }
1553
1554 /* remove the prefetch IO from the tree */
1555 spic = avl_first(&scn->scn_prefetch_queue);
1556 spa->spa_scrub_inflight += BP_GET_PSIZE(&spic->spic_bp);
1557 avl_remove(&scn->scn_prefetch_queue, spic);
1558
1559 mutex_exit(&spa->spa_scrub_lock);
1560
1561 /* issue the prefetch asynchronously */
1562 (void) arc_read(scn->scn_zio_root, scn->scn_dp->dp_spa,
1563 &spic->spic_bp, dsl_scan_prefetch_cb, spic->spic_spc,
1564 ZIO_PRIORITY_SCRUB, zio_flags, &flags, &spic->spic_zb);
1565
1566 kmem_free(spic, sizeof (scan_prefetch_issue_ctx_t));
1567 }
1568
1569 ASSERT(scn->scn_prefetch_stop);
1570
1571 /* free any prefetches we didn't get to complete */
1572 mutex_enter(&spa->spa_scrub_lock);
1573 while ((spic = avl_first(&scn->scn_prefetch_queue)) != NULL) {
1574 avl_remove(&scn->scn_prefetch_queue, spic);
1575 scan_prefetch_ctx_rele(spic->spic_spc, scn);
1576 kmem_free(spic, sizeof (scan_prefetch_issue_ctx_t));
1577 }
1578 ASSERT0(avl_numnodes(&scn->scn_prefetch_queue));
1579 mutex_exit(&spa->spa_scrub_lock);
1580}
1581
715static boolean_t
716dsl_scan_check_resume(dsl_scan_t *scn, const dnode_phys_t *dnp,
717 const zbookmark_phys_t *zb)
718{
719 /*
720 * We never skip over user/group accounting objects (obj<0)
721 */
722 if (!ZB_IS_ZERO(&scn->scn_phys.scn_bookmark) &&

--- 20 unchanged lines hidden (view full) ---

743 (longlong_t)zb->zb_level,
744 (longlong_t)zb->zb_blkid);
745 bzero(&scn->scn_phys.scn_bookmark, sizeof (*zb));
746 }
747 }
748 return (B_FALSE);
749}
750
1582static boolean_t
1583dsl_scan_check_resume(dsl_scan_t *scn, const dnode_phys_t *dnp,
1584 const zbookmark_phys_t *zb)
1585{
1586 /*
1587 * We never skip over user/group accounting objects (obj<0)
1588 */
1589 if (!ZB_IS_ZERO(&scn->scn_phys.scn_bookmark) &&

--- 20 unchanged lines hidden (view full) ---

1610 (longlong_t)zb->zb_level,
1611 (longlong_t)zb->zb_blkid);
1612 bzero(&scn->scn_phys.scn_bookmark, sizeof (*zb));
1613 }
1614 }
1615 return (B_FALSE);
1616}
1617
1618static void dsl_scan_visitbp(blkptr_t *bp, const zbookmark_phys_t *zb,
1619 dnode_phys_t *dnp, dsl_dataset_t *ds, dsl_scan_t *scn,
1620 dmu_objset_type_t ostype, dmu_tx_t *tx);
1621static void dsl_scan_visitdnode(
1622 dsl_scan_t *, dsl_dataset_t *ds, dmu_objset_type_t ostype,
1623 dnode_phys_t *dnp, uint64_t object, dmu_tx_t *tx);
1624
751/*
752 * Return nonzero on i/o error.
753 * Return new buf to write out in *bufp.
754 */
755static int
756dsl_scan_recurse(dsl_scan_t *scn, dsl_dataset_t *ds, dmu_objset_type_t ostype,
757 dnode_phys_t *dnp, const blkptr_t *bp,
758 const zbookmark_phys_t *zb, dmu_tx_t *tx)

--- 5 unchanged lines hidden (view full) ---

764 if (BP_GET_LEVEL(bp) > 0) {
765 arc_flags_t flags = ARC_FLAG_WAIT;
766 int i;
767 blkptr_t *cbp;
768 int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT;
769 arc_buf_t *buf;
770
771 err = arc_read(NULL, dp->dp_spa, bp, arc_getbuf_func, &buf,
1625/*
1626 * Return nonzero on i/o error.
1627 * Return new buf to write out in *bufp.
1628 */
1629static int
1630dsl_scan_recurse(dsl_scan_t *scn, dsl_dataset_t *ds, dmu_objset_type_t ostype,
1631 dnode_phys_t *dnp, const blkptr_t *bp,
1632 const zbookmark_phys_t *zb, dmu_tx_t *tx)

--- 5 unchanged lines hidden (view full) ---

1638 if (BP_GET_LEVEL(bp) > 0) {
1639 arc_flags_t flags = ARC_FLAG_WAIT;
1640 int i;
1641 blkptr_t *cbp;
1642 int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT;
1643 arc_buf_t *buf;
1644
1645 err = arc_read(NULL, dp->dp_spa, bp, arc_getbuf_func, &buf,
772 ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb);
1646 ZIO_PRIORITY_SCRUB, zio_flags, &flags, zb);
773 if (err) {
774 scn->scn_phys.scn_errors++;
775 return (err);
776 }
777 for (i = 0, cbp = buf->b_data; i < epb; i++, cbp++) {
1647 if (err) {
1648 scn->scn_phys.scn_errors++;
1649 return (err);
1650 }
1651 for (i = 0, cbp = buf->b_data; i < epb; i++, cbp++) {
778 dsl_scan_prefetch(scn, buf, cbp, zb->zb_objset,
779 zb->zb_object, zb->zb_blkid * epb + i);
780 }
781 for (i = 0, cbp = buf->b_data; i < epb; i++, cbp++) {
782 zbookmark_phys_t czb;
783
784 SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object,
785 zb->zb_level - 1,
786 zb->zb_blkid * epb + i);
787 dsl_scan_visitbp(cbp, &czb, dnp,
788 ds, scn, ostype, tx);
789 }
790 arc_buf_destroy(buf, &buf);
791 } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) {
792 arc_flags_t flags = ARC_FLAG_WAIT;
793 dnode_phys_t *cdnp;
1652 zbookmark_phys_t czb;
1653
1654 SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object,
1655 zb->zb_level - 1,
1656 zb->zb_blkid * epb + i);
1657 dsl_scan_visitbp(cbp, &czb, dnp,
1658 ds, scn, ostype, tx);
1659 }
1660 arc_buf_destroy(buf, &buf);
1661 } else if (BP_GET_TYPE(bp) == DMU_OT_DNODE) {
1662 arc_flags_t flags = ARC_FLAG_WAIT;
1663 dnode_phys_t *cdnp;
794 int i, j;
1664 int i;
795 int epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT;
796 arc_buf_t *buf;
797
798 err = arc_read(NULL, dp->dp_spa, bp, arc_getbuf_func, &buf,
1665 int epb = BP_GET_LSIZE(bp) >> DNODE_SHIFT;
1666 arc_buf_t *buf;
1667
1668 err = arc_read(NULL, dp->dp_spa, bp, arc_getbuf_func, &buf,
799 ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb);
1669 ZIO_PRIORITY_SCRUB, zio_flags, &flags, zb);
800 if (err) {
801 scn->scn_phys.scn_errors++;
802 return (err);
803 }
804 for (i = 0, cdnp = buf->b_data; i < epb; i++, cdnp++) {
1670 if (err) {
1671 scn->scn_phys.scn_errors++;
1672 return (err);
1673 }
1674 for (i = 0, cdnp = buf->b_data; i < epb; i++, cdnp++) {
805 for (j = 0; j < cdnp->dn_nblkptr; j++) {
806 blkptr_t *cbp = &cdnp->dn_blkptr[j];
807 dsl_scan_prefetch(scn, buf, cbp,
808 zb->zb_objset, zb->zb_blkid * epb + i, j);
809 }
810 }
811 for (i = 0, cdnp = buf->b_data; i < epb; i++, cdnp++) {
812 dsl_scan_visitdnode(scn, ds, ostype,
813 cdnp, zb->zb_blkid * epb + i, tx);
814 }
815
816 arc_buf_destroy(buf, &buf);
817 } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) {
818 arc_flags_t flags = ARC_FLAG_WAIT;
819 objset_phys_t *osp;
820 arc_buf_t *buf;
821
822 err = arc_read(NULL, dp->dp_spa, bp, arc_getbuf_func, &buf,
1675 dsl_scan_visitdnode(scn, ds, ostype,
1676 cdnp, zb->zb_blkid * epb + i, tx);
1677 }
1678
1679 arc_buf_destroy(buf, &buf);
1680 } else if (BP_GET_TYPE(bp) == DMU_OT_OBJSET) {
1681 arc_flags_t flags = ARC_FLAG_WAIT;
1682 objset_phys_t *osp;
1683 arc_buf_t *buf;
1684
1685 err = arc_read(NULL, dp->dp_spa, bp, arc_getbuf_func, &buf,
823 ZIO_PRIORITY_ASYNC_READ, zio_flags, &flags, zb);
1686 ZIO_PRIORITY_SCRUB, zio_flags, &flags, zb);
824 if (err) {
825 scn->scn_phys.scn_errors++;
826 return (err);
827 }
828
829 osp = buf->b_data;
830
831 dsl_scan_visitdnode(scn, ds, osp->os_type,

--- 49 unchanged lines hidden (view full) ---

881 * first 5; we want them to be useful.
882 */
883static void
884dsl_scan_visitbp(blkptr_t *bp, const zbookmark_phys_t *zb,
885 dnode_phys_t *dnp, dsl_dataset_t *ds, dsl_scan_t *scn,
886 dmu_objset_type_t ostype, dmu_tx_t *tx)
887{
888 dsl_pool_t *dp = scn->scn_dp;
1687 if (err) {
1688 scn->scn_phys.scn_errors++;
1689 return (err);
1690 }
1691
1692 osp = buf->b_data;
1693
1694 dsl_scan_visitdnode(scn, ds, osp->os_type,

--- 49 unchanged lines hidden (view full) ---

1744 * first 5; we want them to be useful.
1745 */
1746static void
1747dsl_scan_visitbp(blkptr_t *bp, const zbookmark_phys_t *zb,
1748 dnode_phys_t *dnp, dsl_dataset_t *ds, dsl_scan_t *scn,
1749 dmu_objset_type_t ostype, dmu_tx_t *tx)
1750{
1751 dsl_pool_t *dp = scn->scn_dp;
889 arc_buf_t *buf = NULL;
890 blkptr_t bp_toread = *bp;
1752 blkptr_t *bp_toread = NULL;
891
1753
892 /* ASSERT(pbuf == NULL || arc_released(pbuf)); */
893
894 if (dsl_scan_check_suspend(scn, zb))
895 return;
896
897 if (dsl_scan_check_resume(scn, dnp, zb))
898 return;
899
1754 if (dsl_scan_check_suspend(scn, zb))
1755 return;
1756
1757 if (dsl_scan_check_resume(scn, dnp, zb))
1758 return;
1759
900 if (BP_IS_HOLE(bp))
901 return;
902
903 scn->scn_visited_this_txg++;
904
905 dprintf_bp(bp,
906 "visiting ds=%p/%llu zb=%llx/%llx/%llx/%llx bp=%p",
907 ds, ds ? ds->ds_object : 0,
908 zb->zb_objset, zb->zb_object, zb->zb_level, zb->zb_blkid,
909 bp);
910
1760 scn->scn_visited_this_txg++;
1761
1762 dprintf_bp(bp,
1763 "visiting ds=%p/%llu zb=%llx/%llx/%llx/%llx bp=%p",
1764 ds, ds ? ds->ds_object : 0,
1765 zb->zb_objset, zb->zb_object, zb->zb_level, zb->zb_blkid,
1766 bp);
1767
911 if (bp->blk_birth <= scn->scn_phys.scn_cur_min_txg)
1768 if (BP_IS_HOLE(bp)) {
1769 scn->scn_holes_this_txg++;
912 return;
1770 return;
1771 }
913
1772
914 if (dsl_scan_recurse(scn, ds, ostype, dnp, &bp_toread, zb, tx) != 0)
1773 if (bp->blk_birth <= scn->scn_phys.scn_cur_min_txg) {
1774 scn->scn_lt_min_this_txg++;
915 return;
1775 return;
1776 }
916
1777
1778 bp_toread = kmem_alloc(sizeof (blkptr_t), KM_SLEEP);
1779 *bp_toread = *bp;
1780
1781 if (dsl_scan_recurse(scn, ds, ostype, dnp, bp_toread, zb, tx) != 0)
1782 return;
1783
917 /*
918 * If dsl_scan_ddt() has already visited this block, it will have
919 * already done any translations or scrubbing, so don't call the
920 * callback again.
921 */
922 if (ddt_class_contains(dp->dp_spa,
923 scn->scn_phys.scn_ddt_class_max, bp)) {
1784 /*
1785 * If dsl_scan_ddt() has already visited this block, it will have
1786 * already done any translations or scrubbing, so don't call the
1787 * callback again.
1788 */
1789 if (ddt_class_contains(dp->dp_spa,
1790 scn->scn_phys.scn_ddt_class_max, bp)) {
924 ASSERT(buf == NULL);
925 return;
1791 scn->scn_ddt_contained_this_txg++;
1792 goto out;
926 }
927
928 /*
929 * If this block is from the future (after cur_max_txg), then we
930 * are doing this on behalf of a deleted snapshot, and we will
931 * revisit the future block on the next pass of this dataset.
932 * Don't scan it now unless we need to because something
933 * under it was modified.
934 */
1793 }
1794
1795 /*
1796 * If this block is from the future (after cur_max_txg), then we
1797 * are doing this on behalf of a deleted snapshot, and we will
1798 * revisit the future block on the next pass of this dataset.
1799 * Don't scan it now unless we need to because something
1800 * under it was modified.
1801 */
935 if (BP_PHYSICAL_BIRTH(bp) <= scn->scn_phys.scn_cur_max_txg) {
936 scan_funcs[scn->scn_phys.scn_func](dp, bp, zb);
1802 if (BP_PHYSICAL_BIRTH(bp) > scn->scn_phys.scn_cur_max_txg) {
1803 scn->scn_gt_max_this_txg++;
1804 goto out;
937 }
1805 }
1806
1807 scan_funcs[scn->scn_phys.scn_func](dp, bp, zb);
1808out:
1809 kmem_free(bp_toread, sizeof (blkptr_t));
938}
939
940static void
941dsl_scan_visit_rootbp(dsl_scan_t *scn, dsl_dataset_t *ds, blkptr_t *bp,
942 dmu_tx_t *tx)
943{
944 zbookmark_phys_t zb;
1810}
1811
1812static void
1813dsl_scan_visit_rootbp(dsl_scan_t *scn, dsl_dataset_t *ds, blkptr_t *bp,
1814 dmu_tx_t *tx)
1815{
1816 zbookmark_phys_t zb;
1817 scan_prefetch_ctx_t *spc;
945
946 SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET,
947 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
1818
1819 SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET,
1820 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
948 dsl_scan_visitbp(bp, &zb, NULL,
949 ds, scn, DMU_OST_NONE, tx);
950
1821
1822 if (ZB_IS_ZERO(&scn->scn_phys.scn_bookmark)) {
1823 SET_BOOKMARK(&scn->scn_prefetch_bookmark,
1824 zb.zb_objset, 0, 0, 0);
1825 } else {
1826 scn->scn_prefetch_bookmark = scn->scn_phys.scn_bookmark;
1827 }
1828
1829 scn->scn_objsets_visited_this_txg++;
1830
1831 spc = scan_prefetch_ctx_create(scn, NULL, FTAG);
1832 dsl_scan_prefetch(spc, bp, &zb);
1833 scan_prefetch_ctx_rele(spc, FTAG);
1834
1835 dsl_scan_visitbp(bp, &zb, NULL, ds, scn, DMU_OST_NONE, tx);
1836
951 dprintf_ds(ds, "finished scan%s", "");
952}
953
1837 dprintf_ds(ds, "finished scan%s", "");
1838}
1839
954void
955dsl_scan_ds_destroyed(dsl_dataset_t *ds, dmu_tx_t *tx)
1840static void
1841ds_destroyed_scn_phys(dsl_dataset_t *ds, dsl_scan_phys_t *scn_phys)
956{
1842{
957 dsl_pool_t *dp = ds->ds_dir->dd_pool;
958 dsl_scan_t *scn = dp->dp_scan;
959 uint64_t mintxg;
960
961 if (scn->scn_phys.scn_state != DSS_SCANNING)
962 return;
963
964 if (scn->scn_phys.scn_bookmark.zb_objset == ds->ds_object) {
1843 if (scn_phys->scn_bookmark.zb_objset == ds->ds_object) {
965 if (ds->ds_is_snapshot) {
966 /*
967 * Note:
968 * - scn_cur_{min,max}_txg stays the same.
969 * - Setting the flag is not really necessary if
970 * scn_cur_max_txg == scn_max_txg, because there
971 * is nothing after this snapshot that we care
972 * about. However, we set it anyway and then
973 * ignore it when we retraverse it in
974 * dsl_scan_visitds().
975 */
1844 if (ds->ds_is_snapshot) {
1845 /*
1846 * Note:
1847 * - scn_cur_{min,max}_txg stays the same.
1848 * - Setting the flag is not really necessary if
1849 * scn_cur_max_txg == scn_max_txg, because there
1850 * is nothing after this snapshot that we care
1851 * about. However, we set it anyway and then
1852 * ignore it when we retraverse it in
1853 * dsl_scan_visitds().
1854 */
976 scn->scn_phys.scn_bookmark.zb_objset =
1855 scn_phys->scn_bookmark.zb_objset =
977 dsl_dataset_phys(ds)->ds_next_snap_obj;
978 zfs_dbgmsg("destroying ds %llu; currently traversing; "
979 "reset zb_objset to %llu",
980 (u_longlong_t)ds->ds_object,
981 (u_longlong_t)dsl_dataset_phys(ds)->
982 ds_next_snap_obj);
1856 dsl_dataset_phys(ds)->ds_next_snap_obj;
1857 zfs_dbgmsg("destroying ds %llu; currently traversing; "
1858 "reset zb_objset to %llu",
1859 (u_longlong_t)ds->ds_object,
1860 (u_longlong_t)dsl_dataset_phys(ds)->
1861 ds_next_snap_obj);
983 scn->scn_phys.scn_flags |= DSF_VISIT_DS_AGAIN;
1862 scn_phys->scn_flags |= DSF_VISIT_DS_AGAIN;
984 } else {
1863 } else {
985 SET_BOOKMARK(&scn->scn_phys.scn_bookmark,
1864 SET_BOOKMARK(&scn_phys->scn_bookmark,
986 ZB_DESTROYED_OBJSET, 0, 0, 0);
987 zfs_dbgmsg("destroying ds %llu; currently traversing; "
988 "reset bookmark to -1,0,0,0",
989 (u_longlong_t)ds->ds_object);
990 }
1865 ZB_DESTROYED_OBJSET, 0, 0, 0);
1866 zfs_dbgmsg("destroying ds %llu; currently traversing; "
1867 "reset bookmark to -1,0,0,0",
1868 (u_longlong_t)ds->ds_object);
1869 }
991 } else if (zap_lookup_int_key(dp->dp_meta_objset,
992 scn->scn_phys.scn_queue_obj, ds->ds_object, &mintxg) == 0) {
1870 }
1871}
1872
1873/*
1874 * Invoked when a dataset is destroyed. We need to make sure that:
1875 *
1876 * 1) If it is the dataset that was currently being scanned, we write
1877 * a new dsl_scan_phys_t and marking the objset reference in it
1878 * as destroyed.
1879 * 2) Remove it from the work queue, if it was present.
1880 *
1881 * If the dataset was actually a snapshot, instead of marking the dataset
1882 * as destroyed, we instead substitute the next snapshot in line.
1883 */
1884void
1885dsl_scan_ds_destroyed(dsl_dataset_t *ds, dmu_tx_t *tx)
1886{
1887 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1888 dsl_scan_t *scn = dp->dp_scan;
1889 uint64_t mintxg;
1890
1891 if (!dsl_scan_is_running(scn))
1892 return;
1893
1894 ds_destroyed_scn_phys(ds, &scn->scn_phys);
1895 ds_destroyed_scn_phys(ds, &scn->scn_phys_cached);
1896
1897 if (scan_ds_queue_contains(scn, ds->ds_object, &mintxg)) {
1898 scan_ds_queue_remove(scn, ds->ds_object);
1899 if (ds->ds_is_snapshot)
1900 scan_ds_queue_insert(scn,
1901 dsl_dataset_phys(ds)->ds_next_snap_obj, mintxg);
1902 }
1903
1904 if (zap_lookup_int_key(dp->dp_meta_objset, scn->scn_phys.scn_queue_obj,
1905 ds->ds_object, &mintxg) == 0) {
993 ASSERT3U(dsl_dataset_phys(ds)->ds_num_children, <=, 1);
994 VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset,
995 scn->scn_phys.scn_queue_obj, ds->ds_object, tx));
996 if (ds->ds_is_snapshot) {
997 /*
998 * We keep the same mintxg; it could be >
999 * ds_creation_txg if the previous snapshot was
1000 * deleted too.

--- 12 unchanged lines hidden (view full) ---

1013 (u_longlong_t)ds->ds_object);
1014 }
1015 }
1016
1017 /*
1018 * dsl_scan_sync() should be called after this, and should sync
1019 * out our changed state, but just to be safe, do it here.
1020 */
1906 ASSERT3U(dsl_dataset_phys(ds)->ds_num_children, <=, 1);
1907 VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset,
1908 scn->scn_phys.scn_queue_obj, ds->ds_object, tx));
1909 if (ds->ds_is_snapshot) {
1910 /*
1911 * We keep the same mintxg; it could be >
1912 * ds_creation_txg if the previous snapshot was
1913 * deleted too.

--- 12 unchanged lines hidden (view full) ---

1926 (u_longlong_t)ds->ds_object);
1927 }
1928 }
1929
1930 /*
1931 * dsl_scan_sync() should be called after this, and should sync
1932 * out our changed state, but just to be safe, do it here.
1933 */
1021 dsl_scan_sync_state(scn, tx);
1934 dsl_scan_sync_state(scn, tx, SYNC_CACHED);
1022}
1023
1935}
1936
1937static void
1938ds_snapshotted_bookmark(dsl_dataset_t *ds, zbookmark_phys_t *scn_bookmark)
1939{
1940 if (scn_bookmark->zb_objset == ds->ds_object) {
1941 scn_bookmark->zb_objset =
1942 dsl_dataset_phys(ds)->ds_prev_snap_obj;
1943 zfs_dbgmsg("snapshotting ds %llu; currently traversing; "
1944 "reset zb_objset to %llu",
1945 (u_longlong_t)ds->ds_object,
1946 (u_longlong_t)dsl_dataset_phys(ds)->ds_prev_snap_obj);
1947 }
1948}
1949
1950/*
1951 * Called when a dataset is snapshotted. If we were currently traversing
1952 * this snapshot, we reset our bookmark to point at the newly created
1953 * snapshot. We also modify our work queue to remove the old snapshot and
1954 * replace with the new one.
1955 */
1024void
1025dsl_scan_ds_snapshotted(dsl_dataset_t *ds, dmu_tx_t *tx)
1026{
1027 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1028 dsl_scan_t *scn = dp->dp_scan;
1029 uint64_t mintxg;
1030
1956void
1957dsl_scan_ds_snapshotted(dsl_dataset_t *ds, dmu_tx_t *tx)
1958{
1959 dsl_pool_t *dp = ds->ds_dir->dd_pool;
1960 dsl_scan_t *scn = dp->dp_scan;
1961 uint64_t mintxg;
1962
1031 if (scn->scn_phys.scn_state != DSS_SCANNING)
1963 if (!dsl_scan_is_running(scn))
1032 return;
1033
1034 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0);
1035
1964 return;
1965
1966 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0);
1967
1036 if (scn->scn_phys.scn_bookmark.zb_objset == ds->ds_object) {
1037 scn->scn_phys.scn_bookmark.zb_objset =
1038 dsl_dataset_phys(ds)->ds_prev_snap_obj;
1039 zfs_dbgmsg("snapshotting ds %llu; currently traversing; "
1040 "reset zb_objset to %llu",
1041 (u_longlong_t)ds->ds_object,
1042 (u_longlong_t)dsl_dataset_phys(ds)->ds_prev_snap_obj);
1043 } else if (zap_lookup_int_key(dp->dp_meta_objset,
1044 scn->scn_phys.scn_queue_obj, ds->ds_object, &mintxg) == 0) {
1968 ds_snapshotted_bookmark(ds, &scn->scn_phys.scn_bookmark);
1969 ds_snapshotted_bookmark(ds, &scn->scn_phys_cached.scn_bookmark);
1970
1971 if (scan_ds_queue_contains(scn, ds->ds_object, &mintxg)) {
1972 scan_ds_queue_remove(scn, ds->ds_object);
1973 scan_ds_queue_insert(scn,
1974 dsl_dataset_phys(ds)->ds_prev_snap_obj, mintxg);
1975 }
1976
1977 if (zap_lookup_int_key(dp->dp_meta_objset, scn->scn_phys.scn_queue_obj,
1978 ds->ds_object, &mintxg) == 0) {
1045 VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset,
1046 scn->scn_phys.scn_queue_obj, ds->ds_object, tx));
1047 VERIFY(zap_add_int_key(dp->dp_meta_objset,
1048 scn->scn_phys.scn_queue_obj,
1049 dsl_dataset_phys(ds)->ds_prev_snap_obj, mintxg, tx) == 0);
1050 zfs_dbgmsg("snapshotting ds %llu; in queue; "
1051 "replacing with %llu",
1052 (u_longlong_t)ds->ds_object,
1053 (u_longlong_t)dsl_dataset_phys(ds)->ds_prev_snap_obj);
1054 }
1979 VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset,
1980 scn->scn_phys.scn_queue_obj, ds->ds_object, tx));
1981 VERIFY(zap_add_int_key(dp->dp_meta_objset,
1982 scn->scn_phys.scn_queue_obj,
1983 dsl_dataset_phys(ds)->ds_prev_snap_obj, mintxg, tx) == 0);
1984 zfs_dbgmsg("snapshotting ds %llu; in queue; "
1985 "replacing with %llu",
1986 (u_longlong_t)ds->ds_object,
1987 (u_longlong_t)dsl_dataset_phys(ds)->ds_prev_snap_obj);
1988 }
1055 dsl_scan_sync_state(scn, tx);
1989
1990 dsl_scan_sync_state(scn, tx, SYNC_CACHED);
1056}
1057
1991}
1992
1058void
1059dsl_scan_ds_clone_swapped(dsl_dataset_t *ds1, dsl_dataset_t *ds2, dmu_tx_t *tx)
1993static void
1994ds_clone_swapped_bookmark(dsl_dataset_t *ds1, dsl_dataset_t *ds2,
1995 zbookmark_phys_t *scn_bookmark)
1060{
1996{
1061 dsl_pool_t *dp = ds1->ds_dir->dd_pool;
1062 dsl_scan_t *scn = dp->dp_scan;
1063 uint64_t mintxg;
1064
1065 if (scn->scn_phys.scn_state != DSS_SCANNING)
1066 return;
1067
1068 if (scn->scn_phys.scn_bookmark.zb_objset == ds1->ds_object) {
1069 scn->scn_phys.scn_bookmark.zb_objset = ds2->ds_object;
1997 if (scn_bookmark->zb_objset == ds1->ds_object) {
1998 scn_bookmark->zb_objset = ds2->ds_object;
1070 zfs_dbgmsg("clone_swap ds %llu; currently traversing; "
1071 "reset zb_objset to %llu",
1072 (u_longlong_t)ds1->ds_object,
1073 (u_longlong_t)ds2->ds_object);
1999 zfs_dbgmsg("clone_swap ds %llu; currently traversing; "
2000 "reset zb_objset to %llu",
2001 (u_longlong_t)ds1->ds_object,
2002 (u_longlong_t)ds2->ds_object);
1074 } else if (scn->scn_phys.scn_bookmark.zb_objset == ds2->ds_object) {
1075 scn->scn_phys.scn_bookmark.zb_objset = ds1->ds_object;
2003 } else if (scn_bookmark->zb_objset == ds2->ds_object) {
2004 scn_bookmark->zb_objset = ds1->ds_object;
1076 zfs_dbgmsg("clone_swap ds %llu; currently traversing; "
1077 "reset zb_objset to %llu",
1078 (u_longlong_t)ds2->ds_object,
1079 (u_longlong_t)ds1->ds_object);
1080 }
2005 zfs_dbgmsg("clone_swap ds %llu; currently traversing; "
2006 "reset zb_objset to %llu",
2007 (u_longlong_t)ds2->ds_object,
2008 (u_longlong_t)ds1->ds_object);
2009 }
2010}
1081
2011
2012/*
2013 * Called when a parent dataset and its clone are swapped. If we were
2014 * currently traversing the dataset, we need to switch to traversing the
2015 * newly promoted parent.
2016 */
2017void
2018dsl_scan_ds_clone_swapped(dsl_dataset_t *ds1, dsl_dataset_t *ds2, dmu_tx_t *tx)
2019{
2020 dsl_pool_t *dp = ds1->ds_dir->dd_pool;
2021 dsl_scan_t *scn = dp->dp_scan;
2022 uint64_t mintxg;
2023
2024 if (!dsl_scan_is_running(scn))
2025 return;
2026
2027 ds_clone_swapped_bookmark(ds1, ds2, &scn->scn_phys.scn_bookmark);
2028 ds_clone_swapped_bookmark(ds1, ds2, &scn->scn_phys_cached.scn_bookmark);
2029
2030 if (scan_ds_queue_contains(scn, ds1->ds_object, &mintxg)) {
2031 scan_ds_queue_remove(scn, ds1->ds_object);
2032 scan_ds_queue_insert(scn, ds2->ds_object, mintxg);
2033 }
2034 if (scan_ds_queue_contains(scn, ds2->ds_object, &mintxg)) {
2035 scan_ds_queue_remove(scn, ds2->ds_object);
2036 scan_ds_queue_insert(scn, ds1->ds_object, mintxg);
2037 }
2038
1082 if (zap_lookup_int_key(dp->dp_meta_objset, scn->scn_phys.scn_queue_obj,
1083 ds1->ds_object, &mintxg) == 0) {
1084 int err;
2039 if (zap_lookup_int_key(dp->dp_meta_objset, scn->scn_phys.scn_queue_obj,
2040 ds1->ds_object, &mintxg) == 0) {
2041 int err;
1085
1086 ASSERT3U(mintxg, ==, dsl_dataset_phys(ds1)->ds_prev_snap_txg);
1087 ASSERT3U(mintxg, ==, dsl_dataset_phys(ds2)->ds_prev_snap_txg);
1088 VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset,
1089 scn->scn_phys.scn_queue_obj, ds1->ds_object, tx));
1090 err = zap_add_int_key(dp->dp_meta_objset,
1091 scn->scn_phys.scn_queue_obj, ds2->ds_object, mintxg, tx);
1092 VERIFY(err == 0 || err == EEXIST);
1093 if (err == EEXIST) {
1094 /* Both were there to begin with */
1095 VERIFY(0 == zap_add_int_key(dp->dp_meta_objset,
1096 scn->scn_phys.scn_queue_obj,
1097 ds1->ds_object, mintxg, tx));
1098 }
1099 zfs_dbgmsg("clone_swap ds %llu; in queue; "
1100 "replacing with %llu",
1101 (u_longlong_t)ds1->ds_object,
1102 (u_longlong_t)ds2->ds_object);
2042 ASSERT3U(mintxg, ==, dsl_dataset_phys(ds1)->ds_prev_snap_txg);
2043 ASSERT3U(mintxg, ==, dsl_dataset_phys(ds2)->ds_prev_snap_txg);
2044 VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset,
2045 scn->scn_phys.scn_queue_obj, ds1->ds_object, tx));
2046 err = zap_add_int_key(dp->dp_meta_objset,
2047 scn->scn_phys.scn_queue_obj, ds2->ds_object, mintxg, tx);
2048 VERIFY(err == 0 || err == EEXIST);
2049 if (err == EEXIST) {
2050 /* Both were there to begin with */
2051 VERIFY(0 == zap_add_int_key(dp->dp_meta_objset,
2052 scn->scn_phys.scn_queue_obj,
2053 ds1->ds_object, mintxg, tx));
2054 }
2055 zfs_dbgmsg("clone_swap ds %llu; in queue; "
2056 "replacing with %llu",
2057 (u_longlong_t)ds1->ds_object,
2058 (u_longlong_t)ds2->ds_object);
1103 } else if (zap_lookup_int_key(dp->dp_meta_objset,
1104 scn->scn_phys.scn_queue_obj, ds2->ds_object, &mintxg) == 0) {
2059 }
2060 if (zap_lookup_int_key(dp->dp_meta_objset, scn->scn_phys.scn_queue_obj,
2061 ds2->ds_object, &mintxg) == 0) {
1105 ASSERT3U(mintxg, ==, dsl_dataset_phys(ds1)->ds_prev_snap_txg);
1106 ASSERT3U(mintxg, ==, dsl_dataset_phys(ds2)->ds_prev_snap_txg);
1107 VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset,
1108 scn->scn_phys.scn_queue_obj, ds2->ds_object, tx));
1109 VERIFY(0 == zap_add_int_key(dp->dp_meta_objset,
1110 scn->scn_phys.scn_queue_obj, ds1->ds_object, mintxg, tx));
1111 zfs_dbgmsg("clone_swap ds %llu; in queue; "
1112 "replacing with %llu",
1113 (u_longlong_t)ds2->ds_object,
1114 (u_longlong_t)ds1->ds_object);
1115 }
1116
2062 ASSERT3U(mintxg, ==, dsl_dataset_phys(ds1)->ds_prev_snap_txg);
2063 ASSERT3U(mintxg, ==, dsl_dataset_phys(ds2)->ds_prev_snap_txg);
2064 VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset,
2065 scn->scn_phys.scn_queue_obj, ds2->ds_object, tx));
2066 VERIFY(0 == zap_add_int_key(dp->dp_meta_objset,
2067 scn->scn_phys.scn_queue_obj, ds1->ds_object, mintxg, tx));
2068 zfs_dbgmsg("clone_swap ds %llu; in queue; "
2069 "replacing with %llu",
2070 (u_longlong_t)ds2->ds_object,
2071 (u_longlong_t)ds1->ds_object);
2072 }
2073
1117 dsl_scan_sync_state(scn, tx);
2074 dsl_scan_sync_state(scn, tx, SYNC_CACHED);
1118}
1119
2075}
2076
1120struct enqueue_clones_arg {
1121 dmu_tx_t *tx;
1122 uint64_t originobj;
1123};
1124
1125/* ARGSUSED */
1126static int
1127enqueue_clones_cb(dsl_pool_t *dp, dsl_dataset_t *hds, void *arg)
1128{
2077/* ARGSUSED */
2078static int
2079enqueue_clones_cb(dsl_pool_t *dp, dsl_dataset_t *hds, void *arg)
2080{
1129 struct enqueue_clones_arg *eca = arg;
2081 uint64_t originobj = *(uint64_t *)arg;
1130 dsl_dataset_t *ds;
1131 int err;
1132 dsl_scan_t *scn = dp->dp_scan;
1133
2082 dsl_dataset_t *ds;
2083 int err;
2084 dsl_scan_t *scn = dp->dp_scan;
2085
1134 if (dsl_dir_phys(hds->ds_dir)->dd_origin_obj != eca->originobj)
2086 if (dsl_dir_phys(hds->ds_dir)->dd_origin_obj != originobj)
1135 return (0);
1136
1137 err = dsl_dataset_hold_obj(dp, hds->ds_object, FTAG, &ds);
1138 if (err)
1139 return (err);
1140
2087 return (0);
2088
2089 err = dsl_dataset_hold_obj(dp, hds->ds_object, FTAG, &ds);
2090 if (err)
2091 return (err);
2092
1141 while (dsl_dataset_phys(ds)->ds_prev_snap_obj != eca->originobj) {
2093 while (dsl_dataset_phys(ds)->ds_prev_snap_obj != originobj) {
1142 dsl_dataset_t *prev;
1143 err = dsl_dataset_hold_obj(dp,
1144 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev);
1145
1146 dsl_dataset_rele(ds, FTAG);
1147 if (err)
1148 return (err);
1149 ds = prev;
1150 }
2094 dsl_dataset_t *prev;
2095 err = dsl_dataset_hold_obj(dp,
2096 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev);
2097
2098 dsl_dataset_rele(ds, FTAG);
2099 if (err)
2100 return (err);
2101 ds = prev;
2102 }
1151 VERIFY(zap_add_int_key(dp->dp_meta_objset,
1152 scn->scn_phys.scn_queue_obj, ds->ds_object,
1153 dsl_dataset_phys(ds)->ds_prev_snap_txg, eca->tx) == 0);
2103 scan_ds_queue_insert(scn, ds->ds_object,
2104 dsl_dataset_phys(ds)->ds_prev_snap_txg);
1154 dsl_dataset_rele(ds, FTAG);
1155 return (0);
1156}
1157
1158static void
1159dsl_scan_visitds(dsl_scan_t *scn, uint64_t dsobj, dmu_tx_t *tx)
1160{
1161 dsl_pool_t *dp = scn->scn_dp;

--- 28 unchanged lines hidden (view full) ---

1190 * this dataset but skip all of its blocks, because the
1191 * rootbp's birth time is < cur_min_txg. Then we will
1192 * add the next snapshots/clones to the work queue.
1193 */
1194 char *dsname = kmem_alloc(MAXNAMELEN, KM_SLEEP);
1195 dsl_dataset_name(ds, dsname);
1196 zfs_dbgmsg("scanning dataset %llu (%s) is unnecessary because "
1197 "cur_min_txg (%llu) >= max_txg (%llu)",
2105 dsl_dataset_rele(ds, FTAG);
2106 return (0);
2107}
2108
2109static void
2110dsl_scan_visitds(dsl_scan_t *scn, uint64_t dsobj, dmu_tx_t *tx)
2111{
2112 dsl_pool_t *dp = scn->scn_dp;

--- 28 unchanged lines hidden (view full) ---

2141 * this dataset but skip all of its blocks, because the
2142 * rootbp's birth time is < cur_min_txg. Then we will
2143 * add the next snapshots/clones to the work queue.
2144 */
2145 char *dsname = kmem_alloc(MAXNAMELEN, KM_SLEEP);
2146 dsl_dataset_name(ds, dsname);
2147 zfs_dbgmsg("scanning dataset %llu (%s) is unnecessary because "
2148 "cur_min_txg (%llu) >= max_txg (%llu)",
1198 dsobj, dsname,
1199 scn->scn_phys.scn_cur_min_txg,
1200 scn->scn_phys.scn_max_txg);
2149 (longlong_t)dsobj, dsname,
2150 (longlong_t)scn->scn_phys.scn_cur_min_txg,
2151 (longlong_t)scn->scn_phys.scn_max_txg);
1201 kmem_free(dsname, MAXNAMELEN);
1202
1203 goto out;
1204 }
1205
1206 /*
1207 * Only the ZIL in the head (non-snapshot) is valid. Even though
1208 * snapshots can have ZIL block pointers (which may be the same

--- 38 unchanged lines hidden (view full) ---

1247 */
1248
1249 /*
1250 * If we did not completely visit this dataset, do another pass.
1251 */
1252 if (scn->scn_phys.scn_flags & DSF_VISIT_DS_AGAIN) {
1253 zfs_dbgmsg("incomplete pass; visiting again");
1254 scn->scn_phys.scn_flags &= ~DSF_VISIT_DS_AGAIN;
2152 kmem_free(dsname, MAXNAMELEN);
2153
2154 goto out;
2155 }
2156
2157 /*
2158 * Only the ZIL in the head (non-snapshot) is valid. Even though
2159 * snapshots can have ZIL block pointers (which may be the same

--- 38 unchanged lines hidden (view full) ---

2198 */
2199
2200 /*
2201 * If we did not completely visit this dataset, do another pass.
2202 */
2203 if (scn->scn_phys.scn_flags & DSF_VISIT_DS_AGAIN) {
2204 zfs_dbgmsg("incomplete pass; visiting again");
2205 scn->scn_phys.scn_flags &= ~DSF_VISIT_DS_AGAIN;
1255 VERIFY(zap_add_int_key(dp->dp_meta_objset,
1256 scn->scn_phys.scn_queue_obj, ds->ds_object,
1257 scn->scn_phys.scn_cur_max_txg, tx) == 0);
2206 scan_ds_queue_insert(scn, ds->ds_object,
2207 scn->scn_phys.scn_cur_max_txg);
1258 goto out;
1259 }
1260
1261 /*
1262 * Add descendent datasets to work queue.
1263 */
1264 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) {
2208 goto out;
2209 }
2210
2211 /*
2212 * Add descendent datasets to work queue.
2213 */
2214 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) {
1265 VERIFY(zap_add_int_key(dp->dp_meta_objset,
1266 scn->scn_phys.scn_queue_obj,
2215 scan_ds_queue_insert(scn,
1267 dsl_dataset_phys(ds)->ds_next_snap_obj,
2216 dsl_dataset_phys(ds)->ds_next_snap_obj,
1268 dsl_dataset_phys(ds)->ds_creation_txg, tx) == 0);
2217 dsl_dataset_phys(ds)->ds_creation_txg);
1269 }
1270 if (dsl_dataset_phys(ds)->ds_num_children > 1) {
1271 boolean_t usenext = B_FALSE;
1272 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) {
1273 uint64_t count;
1274 /*
1275 * A bug in a previous version of the code could
1276 * cause upgrade_clones_cb() to not set

--- 4 unchanged lines hidden (view full) ---

1281 int err = zap_count(dp->dp_meta_objset,
1282 dsl_dataset_phys(ds)->ds_next_clones_obj, &count);
1283 if (err == 0 &&
1284 count == dsl_dataset_phys(ds)->ds_num_children - 1)
1285 usenext = B_TRUE;
1286 }
1287
1288 if (usenext) {
2218 }
2219 if (dsl_dataset_phys(ds)->ds_num_children > 1) {
2220 boolean_t usenext = B_FALSE;
2221 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) {
2222 uint64_t count;
2223 /*
2224 * A bug in a previous version of the code could
2225 * cause upgrade_clones_cb() to not set

--- 4 unchanged lines hidden (view full) ---

2230 int err = zap_count(dp->dp_meta_objset,
2231 dsl_dataset_phys(ds)->ds_next_clones_obj, &count);
2232 if (err == 0 &&
2233 count == dsl_dataset_phys(ds)->ds_num_children - 1)
2234 usenext = B_TRUE;
2235 }
2236
2237 if (usenext) {
1289 VERIFY0(zap_join_key(dp->dp_meta_objset,
1290 dsl_dataset_phys(ds)->ds_next_clones_obj,
1291 scn->scn_phys.scn_queue_obj,
1292 dsl_dataset_phys(ds)->ds_creation_txg, tx));
2238 zap_cursor_t zc;
2239 zap_attribute_t za;
2240 for (zap_cursor_init(&zc, dp->dp_meta_objset,
2241 dsl_dataset_phys(ds)->ds_next_clones_obj);
2242 zap_cursor_retrieve(&zc, &za) == 0;
2243 (void) zap_cursor_advance(&zc)) {
2244 scan_ds_queue_insert(scn,
2245 zfs_strtonum(za.za_name, NULL),
2246 dsl_dataset_phys(ds)->ds_creation_txg);
2247 }
2248 zap_cursor_fini(&zc);
1293 } else {
2249 } else {
1294 struct enqueue_clones_arg eca;
1295 eca.tx = tx;
1296 eca.originobj = ds->ds_object;
1297
1298 VERIFY0(dmu_objset_find_dp(dp, dp->dp_root_dir_obj,
2250 VERIFY0(dmu_objset_find_dp(dp, dp->dp_root_dir_obj,
1299 enqueue_clones_cb, &eca, DS_FIND_CHILDREN));
2251 enqueue_clones_cb, &ds->ds_object,
2252 DS_FIND_CHILDREN));
1300 }
1301 }
1302
1303out:
1304 dsl_dataset_rele(ds, FTAG);
1305}
1306
1307/* ARGSUSED */
1308static int
1309enqueue_cb(dsl_pool_t *dp, dsl_dataset_t *hds, void *arg)
1310{
2253 }
2254 }
2255
2256out:
2257 dsl_dataset_rele(ds, FTAG);
2258}
2259
2260/* ARGSUSED */
2261static int
2262enqueue_cb(dsl_pool_t *dp, dsl_dataset_t *hds, void *arg)
2263{
1311 dmu_tx_t *tx = arg;
1312 dsl_dataset_t *ds;
1313 int err;
1314 dsl_scan_t *scn = dp->dp_scan;
1315
1316 err = dsl_dataset_hold_obj(dp, hds->ds_object, FTAG, &ds);
1317 if (err)
1318 return (err);
1319

--- 13 unchanged lines hidden (view full) ---

1333 dsl_dataset_rele(ds, FTAG);
1334 dsl_dataset_rele(prev, FTAG);
1335 return (0);
1336 }
1337 dsl_dataset_rele(ds, FTAG);
1338 ds = prev;
1339 }
1340
2264 dsl_dataset_t *ds;
2265 int err;
2266 dsl_scan_t *scn = dp->dp_scan;
2267
2268 err = dsl_dataset_hold_obj(dp, hds->ds_object, FTAG, &ds);
2269 if (err)
2270 return (err);
2271

--- 13 unchanged lines hidden (view full) ---

2285 dsl_dataset_rele(ds, FTAG);
2286 dsl_dataset_rele(prev, FTAG);
2287 return (0);
2288 }
2289 dsl_dataset_rele(ds, FTAG);
2290 ds = prev;
2291 }
2292
1341 VERIFY(zap_add_int_key(dp->dp_meta_objset, scn->scn_phys.scn_queue_obj,
1342 ds->ds_object, dsl_dataset_phys(ds)->ds_prev_snap_txg, tx) == 0);
2293 scan_ds_queue_insert(scn, ds->ds_object,
2294 dsl_dataset_phys(ds)->ds_prev_snap_txg);
1343 dsl_dataset_rele(ds, FTAG);
1344 return (0);
1345}
1346
2295 dsl_dataset_rele(ds, FTAG);
2296 return (0);
2297}
2298
2299/* ARGSUSED */
2300void
2301dsl_scan_ddt_entry(dsl_scan_t *scn, enum zio_checksum checksum,
2302 ddt_entry_t *dde, dmu_tx_t *tx)
2303{
2304 const ddt_key_t *ddk = &dde->dde_key;
2305 ddt_phys_t *ddp = dde->dde_phys;
2306 blkptr_t bp;
2307 zbookmark_phys_t zb = { 0 };
2308 int p;
2309
2310 if (scn->scn_phys.scn_state != DSS_SCANNING)
2311 return;
2312
2313 for (p = 0; p < DDT_PHYS_TYPES; p++, ddp++) {
2314 if (ddp->ddp_phys_birth == 0 ||
2315 ddp->ddp_phys_birth > scn->scn_phys.scn_max_txg)
2316 continue;
2317 ddt_bp_create(checksum, ddk, ddp, &bp);
2318
2319 scn->scn_visited_this_txg++;
2320 scan_funcs[scn->scn_phys.scn_func](scn->scn_dp, &bp, &zb);
2321 }
2322}
2323
1347/*
1348 * Scrub/dedup interaction.
1349 *
1350 * If there are N references to a deduped block, we don't want to scrub it
1351 * N times -- ideally, we should scrub it exactly once.
1352 *
1353 * We leverage the fact that the dde's replication class (enum ddt_class)
1354 * is ordered from highest replication class (DDT_CLASS_DITTO) to lowest

--- 56 unchanged lines hidden (view full) ---

1411 "suspending=%u", (longlong_t)n,
1412 (int)scn->scn_phys.scn_ddt_class_max, (int)scn->scn_suspending);
1413
1414 ASSERT(error == 0 || error == ENOENT);
1415 ASSERT(error != ENOENT ||
1416 ddb->ddb_class > scn->scn_phys.scn_ddt_class_max);
1417}
1418
2324/*
2325 * Scrub/dedup interaction.
2326 *
2327 * If there are N references to a deduped block, we don't want to scrub it
2328 * N times -- ideally, we should scrub it exactly once.
2329 *
2330 * We leverage the fact that the dde's replication class (enum ddt_class)
2331 * is ordered from highest replication class (DDT_CLASS_DITTO) to lowest

--- 56 unchanged lines hidden (view full) ---

2388 "suspending=%u", (longlong_t)n,
2389 (int)scn->scn_phys.scn_ddt_class_max, (int)scn->scn_suspending);
2390
2391 ASSERT(error == 0 || error == ENOENT);
2392 ASSERT(error != ENOENT ||
2393 ddb->ddb_class > scn->scn_phys.scn_ddt_class_max);
2394}
2395
1419/* ARGSUSED */
1420void
1421dsl_scan_ddt_entry(dsl_scan_t *scn, enum zio_checksum checksum,
1422 ddt_entry_t *dde, dmu_tx_t *tx)
2396static uint64_t
2397dsl_scan_ds_maxtxg(dsl_dataset_t *ds)
1423{
2398{
1424 const ddt_key_t *ddk = &dde->dde_key;
1425 ddt_phys_t *ddp = dde->dde_phys;
1426 blkptr_t bp;
1427 zbookmark_phys_t zb = { 0 };
1428
1429 if (scn->scn_phys.scn_state != DSS_SCANNING)
1430 return;
1431
1432 for (int p = 0; p < DDT_PHYS_TYPES; p++, ddp++) {
1433 if (ddp->ddp_phys_birth == 0 ||
1434 ddp->ddp_phys_birth > scn->scn_phys.scn_max_txg)
1435 continue;
1436 ddt_bp_create(checksum, ddk, ddp, &bp);
1437
1438 scn->scn_visited_this_txg++;
1439 scan_funcs[scn->scn_phys.scn_func](scn->scn_dp, &bp, &zb);
1440 }
2399 uint64_t smt = ds->ds_dir->dd_pool->dp_scan->scn_phys.scn_max_txg;
2400 if (ds->ds_is_snapshot)
2401 return (MIN(smt, dsl_dataset_phys(ds)->ds_creation_txg));
2402 return (smt);
1441}
1442
1443static void
1444dsl_scan_visit(dsl_scan_t *scn, dmu_tx_t *tx)
1445{
2403}
2404
2405static void
2406dsl_scan_visit(dsl_scan_t *scn, dmu_tx_t *tx)
2407{
2408 scan_ds_t *sds;
1446 dsl_pool_t *dp = scn->scn_dp;
2409 dsl_pool_t *dp = scn->scn_dp;
1447 zap_cursor_t zc;
1448 zap_attribute_t za;
1449
1450 if (scn->scn_phys.scn_ddt_bookmark.ddb_class <=
1451 scn->scn_phys.scn_ddt_class_max) {
1452 scn->scn_phys.scn_cur_min_txg = scn->scn_phys.scn_min_txg;
1453 scn->scn_phys.scn_cur_max_txg = scn->scn_phys.scn_max_txg;
1454 dsl_scan_ddt(scn, tx);
1455 if (scn->scn_suspending)
1456 return;

--- 7 unchanged lines hidden (view full) ---

1464 dsl_scan_visit_rootbp(scn, NULL,
1465 &dp->dp_meta_rootbp, tx);
1466 spa_set_rootblkptr(dp->dp_spa, &dp->dp_meta_rootbp);
1467 if (scn->scn_suspending)
1468 return;
1469
1470 if (spa_version(dp->dp_spa) < SPA_VERSION_DSL_SCRUB) {
1471 VERIFY0(dmu_objset_find_dp(dp, dp->dp_root_dir_obj,
2410
2411 if (scn->scn_phys.scn_ddt_bookmark.ddb_class <=
2412 scn->scn_phys.scn_ddt_class_max) {
2413 scn->scn_phys.scn_cur_min_txg = scn->scn_phys.scn_min_txg;
2414 scn->scn_phys.scn_cur_max_txg = scn->scn_phys.scn_max_txg;
2415 dsl_scan_ddt(scn, tx);
2416 if (scn->scn_suspending)
2417 return;

--- 7 unchanged lines hidden (view full) ---

2425 dsl_scan_visit_rootbp(scn, NULL,
2426 &dp->dp_meta_rootbp, tx);
2427 spa_set_rootblkptr(dp->dp_spa, &dp->dp_meta_rootbp);
2428 if (scn->scn_suspending)
2429 return;
2430
2431 if (spa_version(dp->dp_spa) < SPA_VERSION_DSL_SCRUB) {
2432 VERIFY0(dmu_objset_find_dp(dp, dp->dp_root_dir_obj,
1472 enqueue_cb, tx, DS_FIND_CHILDREN));
2433 enqueue_cb, NULL, DS_FIND_CHILDREN));
1473 } else {
1474 dsl_scan_visitds(scn,
1475 dp->dp_origin_snap->ds_object, tx);
1476 }
1477 ASSERT(!scn->scn_suspending);
1478 } else if (scn->scn_phys.scn_bookmark.zb_objset !=
1479 ZB_DESTROYED_OBJSET) {
2434 } else {
2435 dsl_scan_visitds(scn,
2436 dp->dp_origin_snap->ds_object, tx);
2437 }
2438 ASSERT(!scn->scn_suspending);
2439 } else if (scn->scn_phys.scn_bookmark.zb_objset !=
2440 ZB_DESTROYED_OBJSET) {
2441 uint64_t dsobj = scn->scn_phys.scn_bookmark.zb_objset;
1480 /*
2442 /*
1481 * If we were suspended, continue from here. Note if the
2443 * If we were suspended, continue from here. Note if the
1482 * ds we were suspended on was deleted, the zb_objset may
1483 * be -1, so we will skip this and find a new objset
1484 * below.
1485 */
2444 * ds we were suspended on was deleted, the zb_objset may
2445 * be -1, so we will skip this and find a new objset
2446 * below.
2447 */
1486 dsl_scan_visitds(scn, scn->scn_phys.scn_bookmark.zb_objset, tx);
2448 dsl_scan_visitds(scn, dsobj, tx);
1487 if (scn->scn_suspending)
1488 return;
1489 }
1490
1491 /*
2449 if (scn->scn_suspending)
2450 return;
2451 }
2452
2453 /*
1492 * In case we were suspended right at the end of the ds, zero the
2454 * In case we suspended right at the end of the ds, zero the
1493 * bookmark so we don't think that we're still trying to resume.
1494 */
1495 bzero(&scn->scn_phys.scn_bookmark, sizeof (zbookmark_phys_t));
1496
2455 * bookmark so we don't think that we're still trying to resume.
2456 */
2457 bzero(&scn->scn_phys.scn_bookmark, sizeof (zbookmark_phys_t));
2458
1497 /* keep pulling things out of the zap-object-as-queue */
1498 while (zap_cursor_init(&zc, dp->dp_meta_objset,
1499 scn->scn_phys.scn_queue_obj),
1500 zap_cursor_retrieve(&zc, &za) == 0) {
2459 /*
2460 * Keep pulling things out of the dataset avl queue. Updates to the
2461 * persistent zap-object-as-queue happen only at checkpoints.
2462 */
2463 while ((sds = avl_first(&scn->scn_queue)) != NULL) {
1501 dsl_dataset_t *ds;
2464 dsl_dataset_t *ds;
1502 uint64_t dsobj;
2465 uint64_t dsobj = sds->sds_dsobj;
2466 uint64_t txg = sds->sds_txg;
1503
2467
1504 dsobj = zfs_strtonum(za.za_name, NULL);
1505 VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset,
1506 scn->scn_phys.scn_queue_obj, dsobj, tx));
2468 /* dequeue and free the ds from the queue */
2469 scan_ds_queue_remove(scn, dsobj);
2470 sds = NULL; /* must not be touched after removal */
1507
2471
1508 /* Set up min/max txg */
2472 /* Set up min / max txg */
1509 VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
2473 VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
1510 if (za.za_first_integer != 0) {
2474 if (txg != 0) {
1511 scn->scn_phys.scn_cur_min_txg =
2475 scn->scn_phys.scn_cur_min_txg =
1512 MAX(scn->scn_phys.scn_min_txg,
1513 za.za_first_integer);
2476 MAX(scn->scn_phys.scn_min_txg, txg);
1514 } else {
1515 scn->scn_phys.scn_cur_min_txg =
1516 MAX(scn->scn_phys.scn_min_txg,
1517 dsl_dataset_phys(ds)->ds_prev_snap_txg);
1518 }
1519 scn->scn_phys.scn_cur_max_txg = dsl_scan_ds_maxtxg(ds);
1520 dsl_dataset_rele(ds, FTAG);
1521
1522 dsl_scan_visitds(scn, dsobj, tx);
2477 } else {
2478 scn->scn_phys.scn_cur_min_txg =
2479 MAX(scn->scn_phys.scn_min_txg,
2480 dsl_dataset_phys(ds)->ds_prev_snap_txg);
2481 }
2482 scn->scn_phys.scn_cur_max_txg = dsl_scan_ds_maxtxg(ds);
2483 dsl_dataset_rele(ds, FTAG);
2484
2485 dsl_scan_visitds(scn, dsobj, tx);
1523 zap_cursor_fini(&zc);
1524 if (scn->scn_suspending)
1525 return;
1526 }
2486 if (scn->scn_suspending)
2487 return;
2488 }
1527 zap_cursor_fini(&zc);
2489 /* No more objsets to fetch, we're done */
2490 scn->scn_phys.scn_bookmark.zb_objset = ZB_DESTROYED_OBJSET;
2491 ASSERT0(scn->scn_suspending);
1528}
1529
2492}
2493
2494static uint64_t
2495dsl_scan_count_leaves(vdev_t *vd)
2496{
2497 uint64_t i, leaves = 0;
2498
2499 /* we only count leaves that belong to the main pool and are readable */
2500 if (vd->vdev_islog || vd->vdev_isspare ||
2501 vd->vdev_isl2cache || !vdev_readable(vd))
2502 return (0);
2503
2504 if (vd->vdev_ops->vdev_op_leaf)
2505 return (1);
2506
2507 for (i = 0; i < vd->vdev_children; i++) {
2508 leaves += dsl_scan_count_leaves(vd->vdev_child[i]);
2509 }
2510
2511 return (leaves);
2512}
2513
2514
2515static void
2516scan_io_queues_update_zio_stats(dsl_scan_io_queue_t *q, const blkptr_t *bp)
2517{
2518 int i;
2519 uint64_t cur_size = 0;
2520
2521 for (i = 0; i < BP_GET_NDVAS(bp); i++) {
2522 cur_size += DVA_GET_ASIZE(&bp->blk_dva[i]);
2523 }
2524
2525 q->q_total_zio_size_this_txg += cur_size;
2526 q->q_zios_this_txg++;
2527}
2528
2529static void
2530scan_io_queues_update_seg_stats(dsl_scan_io_queue_t *q, uint64_t start,
2531 uint64_t end)
2532{
2533 q->q_total_seg_size_this_txg += end - start;
2534 q->q_segs_this_txg++;
2535}
2536
1530static boolean_t
2537static boolean_t
2538scan_io_queue_check_suspend(dsl_scan_t *scn)
2539{
2540 /* See comment in dsl_scan_check_suspend() */
2541 uint64_t curr_time_ns = gethrtime();
2542 uint64_t scan_time_ns = curr_time_ns - scn->scn_sync_start_time;
2543 uint64_t sync_time_ns = curr_time_ns -
2544 scn->scn_dp->dp_spa->spa_sync_starttime;
2545 int dirty_pct = scn->scn_dp->dp_dirty_total * 100 / zfs_dirty_data_max;
2546 int mintime = (scn->scn_phys.scn_func == POOL_SCAN_RESILVER) ?
2547 zfs_resilver_min_time_ms : zfs_scrub_min_time_ms;
2548
2549 return ((NSEC2MSEC(scan_time_ns) > mintime &&
2550 (dirty_pct >= zfs_vdev_async_write_active_min_dirty_percent ||
2551 txg_sync_waiting(scn->scn_dp) ||
2552 NSEC2SEC(sync_time_ns) >= zfs_txg_timeout)) ||
2553 spa_shutting_down(scn->scn_dp->dp_spa));
2554}
2555
2556/*
2557 * Given a list of scan_io_t's in io_list, this issues the io's out to
2558 * disk. This consumes the io_list and frees the scan_io_t's. This is
2559 * called when emptying queues, either when we're up against the memory
2560 * limit or when we have finished scanning. Returns B_TRUE if we stopped
2561 * processing the list before we finished. Any zios that were not issued
2562 * will remain in the io_list.
2563 */
2564static boolean_t
2565scan_io_queue_issue(dsl_scan_io_queue_t *queue, list_t *io_list)
2566{
2567 dsl_scan_t *scn = queue->q_scn;
2568 scan_io_t *sio;
2569 int64_t bytes_issued = 0;
2570 boolean_t suspended = B_FALSE;
2571
2572 while ((sio = list_head(io_list)) != NULL) {
2573 blkptr_t bp;
2574
2575 if (scan_io_queue_check_suspend(scn)) {
2576 suspended = B_TRUE;
2577 break;
2578 }
2579
2580 sio2bp(sio, &bp, queue->q_vd->vdev_id);
2581 bytes_issued += sio->sio_asize;
2582 scan_exec_io(scn->scn_dp, &bp, sio->sio_flags,
2583 &sio->sio_zb, queue);
2584 (void) list_remove_head(io_list);
2585 scan_io_queues_update_zio_stats(queue, &bp);
2586 kmem_free(sio, sizeof (*sio));
2587 }
2588
2589 atomic_add_64(&scn->scn_bytes_pending, -bytes_issued);
2590
2591 return (suspended);
2592}
2593
2594/*
2595 * Given a range_seg_t (extent) and a list, this function passes over a
2596 * scan queue and gathers up the appropriate ios which fit into that
2597 * scan seg (starting from lowest LBA). At the end, we remove the segment
2598 * from the q_exts_by_addr range tree.
2599 */
2600static boolean_t
2601scan_io_queue_gather(dsl_scan_io_queue_t *queue, range_seg_t *rs, list_t *list)
2602{
2603 scan_io_t srch_sio, *sio, *next_sio;
2604 avl_index_t idx;
2605 uint_t num_sios = 0;
2606 int64_t bytes_issued = 0;
2607
2608 ASSERT(rs != NULL);
2609 ASSERT(MUTEX_HELD(&queue->q_vd->vdev_scan_io_queue_lock));
2610
2611 srch_sio.sio_offset = rs->rs_start;
2612
2613 /*
2614 * The exact start of the extent might not contain any matching zios,
2615 * so if that's the case, examine the next one in the tree.
2616 */
2617 sio = avl_find(&queue->q_sios_by_addr, &srch_sio, &idx);
2618 if (sio == NULL)
2619 sio = avl_nearest(&queue->q_sios_by_addr, idx, AVL_AFTER);
2620
2621 while (sio != NULL && sio->sio_offset < rs->rs_end && num_sios <= 32) {
2622 ASSERT3U(sio->sio_offset, >=, rs->rs_start);
2623 ASSERT3U(sio->sio_offset + sio->sio_asize, <=, rs->rs_end);
2624
2625 next_sio = AVL_NEXT(&queue->q_sios_by_addr, sio);
2626 avl_remove(&queue->q_sios_by_addr, sio);
2627
2628 bytes_issued += sio->sio_asize;
2629 num_sios++;
2630 list_insert_tail(list, sio);
2631 sio = next_sio;
2632 }
2633
2634 /*
2635 * We limit the number of sios we process at once to 32 to avoid
2636 * biting off more than we can chew. If we didn't take everything
2637 * in the segment we update it to reflect the work we were able to
2638 * complete. Otherwise, we remove it from the range tree entirely.
2639 */
2640 if (sio != NULL && sio->sio_offset < rs->rs_end) {
2641 range_tree_adjust_fill(queue->q_exts_by_addr, rs,
2642 -bytes_issued);
2643 range_tree_resize_segment(queue->q_exts_by_addr, rs,
2644 sio->sio_offset, rs->rs_end - sio->sio_offset);
2645
2646 return (B_TRUE);
2647 } else {
2648 range_tree_remove(queue->q_exts_by_addr, rs->rs_start,
2649 rs->rs_end - rs->rs_start);
2650 return (B_FALSE);
2651 }
2652}
2653
2654
2655/*
2656 * This is called from the queue emptying thread and selects the next
2657 * extent from which we are to issue io's. The behavior of this function
2658 * depends on the state of the scan, the current memory consumption and
2659 * whether or not we are performing a scan shutdown.
2660 * 1) We select extents in an elevator algorithm (LBA-order) if the scan
2661 * needs to perform a checkpoint
2662 * 2) We select the largest available extent if we are up against the
2663 * memory limit.
2664 * 3) Otherwise we don't select any extents.
2665 */
2666static const range_seg_t *
2667scan_io_queue_fetch_ext(dsl_scan_io_queue_t *queue)
2668{
2669 dsl_scan_t *scn = queue->q_scn;
2670
2671 ASSERT(MUTEX_HELD(&queue->q_vd->vdev_scan_io_queue_lock));
2672 ASSERT(scn->scn_is_sorted);
2673
2674 /* handle tunable overrides */
2675 if (scn->scn_checkpointing || scn->scn_clearing) {
2676 if (zfs_scan_issue_strategy == 1) {
2677 return (range_tree_first(queue->q_exts_by_addr));
2678 } else if (zfs_scan_issue_strategy == 2) {
2679 return (avl_first(&queue->q_exts_by_size));
2680 }
2681 }
2682
2683 /*
2684 * During normal clearing, we want to issue our largest segments
2685 * first, keeping IO as sequential as possible, and leaving the
2686 * smaller extents for later with the hope that they might eventually
2687 * grow to larger sequential segments. However, when the scan is
2688 * checkpointing, no new extents will be added to the sorting queue,
2689 * so the way we are sorted now is as good as it will ever get.
2690 * In this case, we instead switch to issuing extents in LBA order.
2691 */
2692 if (scn->scn_checkpointing) {
2693 return (range_tree_first(queue->q_exts_by_addr));
2694 } else if (scn->scn_clearing) {
2695 return (avl_first(&queue->q_exts_by_size));
2696 } else {
2697 return (NULL);
2698 }
2699}
2700
2701static void
2702scan_io_queues_run_one(void *arg)
2703{
2704 dsl_scan_io_queue_t *queue = arg;
2705 kmutex_t *q_lock = &queue->q_vd->vdev_scan_io_queue_lock;
2706 boolean_t suspended = B_FALSE;
2707 range_seg_t *rs = NULL;
2708 scan_io_t *sio = NULL;
2709 list_t sio_list;
2710 uint64_t bytes_per_leaf = zfs_scan_vdev_limit;
2711 uint64_t nr_leaves = dsl_scan_count_leaves(queue->q_vd);
2712
2713 ASSERT(queue->q_scn->scn_is_sorted);
2714
2715 list_create(&sio_list, sizeof (scan_io_t),
2716 offsetof(scan_io_t, sio_nodes.sio_list_node));
2717 mutex_enter(q_lock);
2718
2719 /* calculate maximum in-flight bytes for this txg (min 1MB) */
2720 queue->q_maxinflight_bytes =
2721 MAX(nr_leaves * bytes_per_leaf, 1ULL << 20);
2722
2723 /* reset per-queue scan statistics for this txg */
2724 queue->q_total_seg_size_this_txg = 0;
2725 queue->q_segs_this_txg = 0;
2726 queue->q_total_zio_size_this_txg = 0;
2727 queue->q_zios_this_txg = 0;
2728
2729 /* loop until we have run out of time or sios */
2730 while ((rs = (range_seg_t*)scan_io_queue_fetch_ext(queue)) != NULL) {
2731 uint64_t seg_start = 0, seg_end = 0;
2732 boolean_t more_left = B_TRUE;
2733
2734 ASSERT(list_is_empty(&sio_list));
2735
2736 /* loop while we still have sios left to process in this rs */
2737 while (more_left) {
2738 scan_io_t *first_sio, *last_sio;
2739
2740 /*
2741 * We have selected which extent needs to be
2742 * processed next. Gather up the corresponding sios.
2743 */
2744 more_left = scan_io_queue_gather(queue, rs, &sio_list);
2745 ASSERT(!list_is_empty(&sio_list));
2746 first_sio = list_head(&sio_list);
2747 last_sio = list_tail(&sio_list);
2748
2749 seg_end = last_sio->sio_offset + last_sio->sio_asize;
2750 if (seg_start == 0)
2751 seg_start = first_sio->sio_offset;
2752
2753 /*
2754 * Issuing sios can take a long time so drop the
2755 * queue lock. The sio queue won't be updated by
2756 * other threads since we're in syncing context so
2757 * we can be sure that our trees will remain exactly
2758 * as we left them.
2759 */
2760 mutex_exit(q_lock);
2761 suspended = scan_io_queue_issue(queue, &sio_list);
2762 mutex_enter(q_lock);
2763
2764 if (suspended)
2765 break;
2766 }
2767 /* update statistics for debugging purposes */
2768 scan_io_queues_update_seg_stats(queue, seg_start, seg_end);
2769
2770 if (suspended)
2771 break;
2772 }
2773
2774
2775 /* If we were suspended in the middle of processing,
2776 * requeue any unfinished sios and exit.
2777 */
2778 while ((sio = list_head(&sio_list)) != NULL) {
2779 list_remove(&sio_list, sio);
2780 scan_io_queue_insert_impl(queue, sio);
2781 }
2782
2783 mutex_exit(q_lock);
2784 list_destroy(&sio_list);
2785}
2786
2787/*
2788 * Performs an emptying run on all scan queues in the pool. This just
2789 * punches out one thread per top-level vdev, each of which processes
2790 * only that vdev's scan queue. We can parallelize the I/O here because
2791 * we know that each queue's io's only affect its own top-level vdev.
2792 *
2793 * This function waits for the queue runs to complete, and must be
2794 * called from dsl_scan_sync (or in general, syncing context).
2795 */
2796static void
2797scan_io_queues_run(dsl_scan_t *scn)
2798{
2799 spa_t *spa = scn->scn_dp->dp_spa;
2800
2801 ASSERT(scn->scn_is_sorted);
2802 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER));
2803
2804 if (scn->scn_bytes_pending == 0)
2805 return;
2806
2807 if (scn->scn_taskq == NULL) {
2808 char *tq_name = kmem_zalloc(ZFS_MAX_DATASET_NAME_LEN + 16,
2809 KM_SLEEP);
2810 int nthreads = spa->spa_root_vdev->vdev_children;
2811
2812 /*
2813 * We need to make this taskq *always* execute as many
2814 * threads in parallel as we have top-level vdevs and no
2815 * less, otherwise strange serialization of the calls to
2816 * scan_io_queues_run_one can occur during spa_sync runs
2817 * and that significantly impacts performance.
2818 */
2819 (void) snprintf(tq_name, ZFS_MAX_DATASET_NAME_LEN + 16,
2820 "dsl_scan_tq_%s", spa->spa_name);
2821 scn->scn_taskq = taskq_create(tq_name, nthreads, minclsyspri,
2822 nthreads, nthreads, TASKQ_PREPOPULATE);
2823 kmem_free(tq_name, ZFS_MAX_DATASET_NAME_LEN + 16);
2824 }
2825
2826 for (uint64_t i = 0; i < spa->spa_root_vdev->vdev_children; i++) {
2827 vdev_t *vd = spa->spa_root_vdev->vdev_child[i];
2828
2829 mutex_enter(&vd->vdev_scan_io_queue_lock);
2830 if (vd->vdev_scan_io_queue != NULL) {
2831 VERIFY(taskq_dispatch(scn->scn_taskq,
2832 scan_io_queues_run_one, vd->vdev_scan_io_queue,
2833 TQ_SLEEP) != TASKQID_INVALID);
2834 }
2835 mutex_exit(&vd->vdev_scan_io_queue_lock);
2836 }
2837
2838 /*
2839 * Wait for the queues to finish issuing thir IOs for this run
2840 * before we return. There may still be IOs in flight at this
2841 * point.
2842 */
2843 taskq_wait(scn->scn_taskq);
2844}
2845
2846static boolean_t
1531dsl_scan_async_block_should_pause(dsl_scan_t *scn)
1532{
1533 uint64_t elapsed_nanosecs;
1534
1535 if (zfs_recover)
1536 return (B_FALSE);
1537
1538 if (scn->scn_visited_this_txg >= zfs_async_block_max_blocks)

--- 21 unchanged lines hidden (view full) ---

1560 dmu_tx_get_txg(tx), bp, BP_GET_PSIZE(bp), 0));
1561 dsl_dir_diduse_space(tx->tx_pool->dp_free_dir, DD_USED_HEAD,
1562 -bp_get_dsize_sync(scn->scn_dp->dp_spa, bp),
1563 -BP_GET_PSIZE(bp), -BP_GET_UCSIZE(bp), tx);
1564 scn->scn_visited_this_txg++;
1565 return (0);
1566}
1567
2847dsl_scan_async_block_should_pause(dsl_scan_t *scn)
2848{
2849 uint64_t elapsed_nanosecs;
2850
2851 if (zfs_recover)
2852 return (B_FALSE);
2853
2854 if (scn->scn_visited_this_txg >= zfs_async_block_max_blocks)

--- 21 unchanged lines hidden (view full) ---

2876 dmu_tx_get_txg(tx), bp, BP_GET_PSIZE(bp), 0));
2877 dsl_dir_diduse_space(tx->tx_pool->dp_free_dir, DD_USED_HEAD,
2878 -bp_get_dsize_sync(scn->scn_dp->dp_spa, bp),
2879 -BP_GET_PSIZE(bp), -BP_GET_UCSIZE(bp), tx);
2880 scn->scn_visited_this_txg++;
2881 return (0);
2882}
2883
2884static void
2885dsl_scan_update_stats(dsl_scan_t *scn)
2886{
2887 spa_t *spa = scn->scn_dp->dp_spa;
2888 uint64_t i;
2889 uint64_t seg_size_total = 0, zio_size_total = 0;
2890 uint64_t seg_count_total = 0, zio_count_total = 0;
2891
2892 for (i = 0; i < spa->spa_root_vdev->vdev_children; i++) {
2893 vdev_t *vd = spa->spa_root_vdev->vdev_child[i];
2894 dsl_scan_io_queue_t *queue = vd->vdev_scan_io_queue;
2895
2896 if (queue == NULL)
2897 continue;
2898
2899 seg_size_total += queue->q_total_seg_size_this_txg;
2900 zio_size_total += queue->q_total_zio_size_this_txg;
2901 seg_count_total += queue->q_segs_this_txg;
2902 zio_count_total += queue->q_zios_this_txg;
2903 }
2904
2905 if (seg_count_total == 0 || zio_count_total == 0) {
2906 scn->scn_avg_seg_size_this_txg = 0;
2907 scn->scn_avg_zio_size_this_txg = 0;
2908 scn->scn_segs_this_txg = 0;
2909 scn->scn_zios_this_txg = 0;
2910 return;
2911 }
2912
2913 scn->scn_avg_seg_size_this_txg = seg_size_total / seg_count_total;
2914 scn->scn_avg_zio_size_this_txg = zio_size_total / zio_count_total;
2915 scn->scn_segs_this_txg = seg_count_total;
2916 scn->scn_zios_this_txg = zio_count_total;
2917}
2918
1568static int
1569dsl_scan_obsolete_block_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
1570{
1571 dsl_scan_t *scn = arg;
1572 const dva_t *dva = &bp->blk_dva[0];
1573
1574 if (dsl_scan_async_block_should_pause(scn))
1575 return (SET_ERROR(ERESTART));

--- 10 unchanged lines hidden (view full) ---

1586{
1587 spa_t *spa = scn->scn_dp->dp_spa;
1588 uint64_t used = 0, comp, uncomp;
1589
1590 if (spa->spa_load_state != SPA_LOAD_NONE)
1591 return (B_FALSE);
1592 if (spa_shutting_down(spa))
1593 return (B_FALSE);
2919static int
2920dsl_scan_obsolete_block_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
2921{
2922 dsl_scan_t *scn = arg;
2923 const dva_t *dva = &bp->blk_dva[0];
2924
2925 if (dsl_scan_async_block_should_pause(scn))
2926 return (SET_ERROR(ERESTART));

--- 10 unchanged lines hidden (view full) ---

2937{
2938 spa_t *spa = scn->scn_dp->dp_spa;
2939 uint64_t used = 0, comp, uncomp;
2940
2941 if (spa->spa_load_state != SPA_LOAD_NONE)
2942 return (B_FALSE);
2943 if (spa_shutting_down(spa))
2944 return (B_FALSE);
1594 if ((scn->scn_phys.scn_state == DSS_SCANNING &&
1595 !dsl_scan_is_paused_scrub(scn)) ||
2945 if ((dsl_scan_is_running(scn) && !dsl_scan_is_paused_scrub(scn)) ||
1596 (scn->scn_async_destroying && !scn->scn_async_stalled))
1597 return (B_TRUE);
1598
1599 if (spa_version(scn->scn_dp->dp_spa) >= SPA_VERSION_DEADLISTS) {
1600 (void) bpobj_space(&scn->scn_dp->dp_free_bpobj,
1601 &used, &comp, &uncomp);
1602 }
1603 return (used != 0);
1604}
1605
2946 (scn->scn_async_destroying && !scn->scn_async_stalled))
2947 return (B_TRUE);
2948
2949 if (spa_version(scn->scn_dp->dp_spa) >= SPA_VERSION_DEADLISTS) {
2950 (void) bpobj_space(&scn->scn_dp->dp_free_bpobj,
2951 &used, &comp, &uncomp);
2952 }
2953 return (used != 0);
2954}
2955
2956static boolean_t
2957dsl_scan_need_resilver(spa_t *spa, const dva_t *dva, size_t psize,
2958 uint64_t phys_birth)
2959{
2960 vdev_t *vd;
2961
2962 if (DVA_GET_GANG(dva)) {
2963 /*
2964 * Gang members may be spread across multiple
2965 * vdevs, so the best estimate we have is the
2966 * scrub range, which has already been checked.
2967 * XXX -- it would be better to change our
2968 * allocation policy to ensure that all
2969 * gang members reside on the same vdev.
2970 */
2971 return (B_TRUE);
2972 }
2973
2974 vd = vdev_lookup_top(spa, DVA_GET_VDEV(dva));
2975
2976 /*
2977 * Check if the txg falls within the range which must be
2978 * resilvered. DVAs outside this range can always be skipped.
2979 */
2980 if (!vdev_dtl_contains(vd, DTL_PARTIAL, phys_birth, 1))
2981 return (B_FALSE);
2982
2983 /*
2984 * Check if the top-level vdev must resilver this offset.
2985 * When the offset does not intersect with a dirty leaf DTL
2986 * then it may be possible to skip the resilver IO. The psize
2987 * is provided instead of asize to simplify the check for RAIDZ.
2988 */
2989 if (!vdev_dtl_need_resilver(vd, DVA_GET_OFFSET(dva), psize))
2990 return (B_FALSE);
2991
2992 return (B_TRUE);
2993}
2994
1606static int
1607dsl_process_async_destroys(dsl_pool_t *dp, dmu_tx_t *tx)
1608{
2995static int
2996dsl_process_async_destroys(dsl_pool_t *dp, dmu_tx_t *tx)
2997{
2998 int err = 0;
1609 dsl_scan_t *scn = dp->dp_scan;
1610 spa_t *spa = dp->dp_spa;
2999 dsl_scan_t *scn = dp->dp_scan;
3000 spa_t *spa = dp->dp_spa;
1611 int err = 0;
1612
1613 if (spa_suspend_async_destroy(spa))
1614 return (0);
1615
1616 if (zfs_free_bpobj_enabled &&
3001
3002 if (spa_suspend_async_destroy(spa))
3003 return (0);
3004
3005 if (zfs_free_bpobj_enabled &&
1617 spa_version(dp->dp_spa) >= SPA_VERSION_DEADLISTS) {
3006 spa_version(spa) >= SPA_VERSION_DEADLISTS) {
1618 scn->scn_is_bptree = B_FALSE;
1619 scn->scn_async_block_min_time_ms = zfs_free_min_time_ms;
3007 scn->scn_is_bptree = B_FALSE;
3008 scn->scn_async_block_min_time_ms = zfs_free_min_time_ms;
1620 scn->scn_zio_root = zio_root(dp->dp_spa, NULL,
3009 scn->scn_zio_root = zio_root(spa, NULL,
1621 NULL, ZIO_FLAG_MUSTSUCCEED);
1622 err = bpobj_iterate(&dp->dp_free_bpobj,
1623 dsl_scan_free_block_cb, scn, tx);
3010 NULL, ZIO_FLAG_MUSTSUCCEED);
3011 err = bpobj_iterate(&dp->dp_free_bpobj,
3012 dsl_scan_free_block_cb, scn, tx);
1624 VERIFY3U(0, ==, zio_wait(scn->scn_zio_root));
3013 VERIFY0(zio_wait(scn->scn_zio_root));
3014 scn->scn_zio_root = NULL;
1625
1626 if (err != 0 && err != ERESTART)
1627 zfs_panic_recover("error %u from bpobj_iterate()", err);
1628 }
1629
1630 if (err == 0 && spa_feature_is_active(spa, SPA_FEATURE_ASYNC_DESTROY)) {
1631 ASSERT(scn->scn_async_destroying);
1632 scn->scn_is_bptree = B_TRUE;
3015
3016 if (err != 0 && err != ERESTART)
3017 zfs_panic_recover("error %u from bpobj_iterate()", err);
3018 }
3019
3020 if (err == 0 && spa_feature_is_active(spa, SPA_FEATURE_ASYNC_DESTROY)) {
3021 ASSERT(scn->scn_async_destroying);
3022 scn->scn_is_bptree = B_TRUE;
1633 scn->scn_zio_root = zio_root(dp->dp_spa, NULL,
3023 scn->scn_zio_root = zio_root(spa, NULL,
1634 NULL, ZIO_FLAG_MUSTSUCCEED);
1635 err = bptree_iterate(dp->dp_meta_objset,
1636 dp->dp_bptree_obj, B_TRUE, dsl_scan_free_block_cb, scn, tx);
1637 VERIFY0(zio_wait(scn->scn_zio_root));
3024 NULL, ZIO_FLAG_MUSTSUCCEED);
3025 err = bptree_iterate(dp->dp_meta_objset,
3026 dp->dp_bptree_obj, B_TRUE, dsl_scan_free_block_cb, scn, tx);
3027 VERIFY0(zio_wait(scn->scn_zio_root));
3028 scn->scn_zio_root = NULL;
1638
1639 if (err == EIO || err == ECKSUM) {
1640 err = 0;
1641 } else if (err != 0 && err != ERESTART) {
1642 zfs_panic_recover("error %u from "
1643 "traverse_dataset_destroyed()", err);
1644 }
1645

--- 92 unchanged lines hidden (view full) ---

1738
1739 if (bpobj_is_empty(&dp->dp_obsolete_bpobj))
1740 dsl_pool_destroy_obsolete_bpobj(dp, tx);
1741 }
1742
1743 return (0);
1744}
1745
3029
3030 if (err == EIO || err == ECKSUM) {
3031 err = 0;
3032 } else if (err != 0 && err != ERESTART) {
3033 zfs_panic_recover("error %u from "
3034 "traverse_dataset_destroyed()", err);
3035 }
3036

--- 92 unchanged lines hidden (view full) ---

3129
3130 if (bpobj_is_empty(&dp->dp_obsolete_bpobj))
3131 dsl_pool_destroy_obsolete_bpobj(dp, tx);
3132 }
3133
3134 return (0);
3135}
3136
3137/*
3138 * This is the primary entry point for scans that is called from syncing
3139 * context. Scans must happen entirely during syncing context so that we
3140 * cna guarantee that blocks we are currently scanning will not change out
3141 * from under us. While a scan is active, this funciton controls how quickly
3142 * transaction groups proceed, instead of the normal handling provided by
3143 * txg_sync_thread().
3144 */
1746void
1747dsl_scan_sync(dsl_pool_t *dp, dmu_tx_t *tx)
1748{
1749 dsl_scan_t *scn = dp->dp_scan;
1750 spa_t *spa = dp->dp_spa;
1751 int err = 0;
3145void
3146dsl_scan_sync(dsl_pool_t *dp, dmu_tx_t *tx)
3147{
3148 dsl_scan_t *scn = dp->dp_scan;
3149 spa_t *spa = dp->dp_spa;
3150 int err = 0;
3151 state_sync_type_t sync_type = SYNC_OPTIONAL;
1752
1753 /*
1754 * Check for scn_restart_txg before checking spa_load_state, so
1755 * that we can restart an old-style scan while the pool is being
1756 * imported (see dsl_scan_init).
1757 */
1758 if (dsl_scan_restarting(scn, tx)) {
1759 pool_scan_func_t func = POOL_SCAN_SCRUB;
1760 dsl_scan_done(scn, B_FALSE, tx);
1761 if (vdev_resilver_needed(spa->spa_root_vdev, NULL, NULL))
1762 func = POOL_SCAN_RESILVER;
1763 zfs_dbgmsg("restarting scan func=%u txg=%llu",
3152
3153 /*
3154 * Check for scn_restart_txg before checking spa_load_state, so
3155 * that we can restart an old-style scan while the pool is being
3156 * imported (see dsl_scan_init).
3157 */
3158 if (dsl_scan_restarting(scn, tx)) {
3159 pool_scan_func_t func = POOL_SCAN_SCRUB;
3160 dsl_scan_done(scn, B_FALSE, tx);
3161 if (vdev_resilver_needed(spa->spa_root_vdev, NULL, NULL))
3162 func = POOL_SCAN_RESILVER;
3163 zfs_dbgmsg("restarting scan func=%u txg=%llu",
1764 func, tx->tx_txg);
3164 func, (longlong_t)tx->tx_txg);
1765 dsl_scan_setup_sync(&func, tx);
1766 }
1767
1768 /*
1769 * Only process scans in sync pass 1.
1770 */
1771 if (spa_sync_pass(dp->dp_spa) > 1)
1772 return;

--- 7 unchanged lines hidden (view full) ---

1780 return;
1781
1782 /*
1783 * If the scan is inactive due to a stalled async destroy, try again.
1784 */
1785 if (!scn->scn_async_stalled && !dsl_scan_active(scn))
1786 return;
1787
3165 dsl_scan_setup_sync(&func, tx);
3166 }
3167
3168 /*
3169 * Only process scans in sync pass 1.
3170 */
3171 if (spa_sync_pass(dp->dp_spa) > 1)
3172 return;

--- 7 unchanged lines hidden (view full) ---

3180 return;
3181
3182 /*
3183 * If the scan is inactive due to a stalled async destroy, try again.
3184 */
3185 if (!scn->scn_async_stalled && !dsl_scan_active(scn))
3186 return;
3187
3188 /* reset scan statistics */
1788 scn->scn_visited_this_txg = 0;
3189 scn->scn_visited_this_txg = 0;
3190 scn->scn_holes_this_txg = 0;
3191 scn->scn_lt_min_this_txg = 0;
3192 scn->scn_gt_max_this_txg = 0;
3193 scn->scn_ddt_contained_this_txg = 0;
3194 scn->scn_objsets_visited_this_txg = 0;
3195 scn->scn_avg_seg_size_this_txg = 0;
3196 scn->scn_segs_this_txg = 0;
3197 scn->scn_avg_zio_size_this_txg = 0;
3198 scn->scn_zios_this_txg = 0;
1789 scn->scn_suspending = B_FALSE;
1790 scn->scn_sync_start_time = gethrtime();
1791 spa->spa_scrub_active = B_TRUE;
1792
1793 /*
1794 * First process the async destroys. If we pause, don't do
1795 * any scrubbing or resilvering. This ensures that there are no
1796 * async destroys while we are scanning, so the scan code doesn't
1797 * have to worry about traversing it. It is also faster to free the
1798 * blocks than to scrub them.
1799 */
1800 err = dsl_process_async_destroys(dp, tx);
1801 if (err != 0)
1802 return;
1803
3199 scn->scn_suspending = B_FALSE;
3200 scn->scn_sync_start_time = gethrtime();
3201 spa->spa_scrub_active = B_TRUE;
3202
3203 /*
3204 * First process the async destroys. If we pause, don't do
3205 * any scrubbing or resilvering. This ensures that there are no
3206 * async destroys while we are scanning, so the scan code doesn't
3207 * have to worry about traversing it. It is also faster to free the
3208 * blocks than to scrub them.
3209 */
3210 err = dsl_process_async_destroys(dp, tx);
3211 if (err != 0)
3212 return;
3213
1804 if (scn->scn_phys.scn_state != DSS_SCANNING)
3214 if (!dsl_scan_is_running(scn) || dsl_scan_is_paused_scrub(scn))
1805 return;
1806
3215 return;
3216
1807 if (scn->scn_done_txg == tx->tx_txg) {
1808 ASSERT(!scn->scn_suspending);
1809 /* finished with scan. */
1810 zfs_dbgmsg("txg %llu scan complete", tx->tx_txg);
1811 dsl_scan_done(scn, B_TRUE, tx);
1812 ASSERT3U(spa->spa_scrub_inflight, ==, 0);
1813 dsl_scan_sync_state(scn, tx);
3217 /*
3218 * Wait a few txgs after importing to begin scanning so that
3219 * we can get the pool imported quickly.
3220 */
3221 if (spa->spa_syncing_txg < spa->spa_first_txg + SCAN_IMPORT_WAIT_TXGS)
1814 return;
3222 return;
3223
3224 /*
3225 * It is possible to switch from unsorted to sorted at any time,
3226 * but afterwards the scan will remain sorted unless reloaded from
3227 * a checkpoint after a reboot.
3228 */
3229 if (!zfs_scan_legacy) {
3230 scn->scn_is_sorted = B_TRUE;
3231 if (scn->scn_last_checkpoint == 0)
3232 scn->scn_last_checkpoint = ddi_get_lbolt();
1815 }
1816
3233 }
3234
1817 if (dsl_scan_is_paused_scrub(scn))
1818 return;
3235 /*
3236 * For sorted scans, determine what kind of work we will be doing
3237 * this txg based on our memory limitations and whether or not we
3238 * need to perform a checkpoint.
3239 */
3240 if (scn->scn_is_sorted) {
3241 /*
3242 * If we are over our checkpoint interval, set scn_clearing
3243 * so that we can begin checkpointing immediately. The
3244 * checkpoint allows us to save a consisent bookmark
3245 * representing how much data we have scrubbed so far.
3246 * Otherwise, use the memory limit to determine if we should
3247 * scan for metadata or start issue scrub IOs. We accumulate
3248 * metadata until we hit our hard memory limit at which point
3249 * we issue scrub IOs until we are at our soft memory limit.
3250 */
3251 if (scn->scn_checkpointing ||
3252 ddi_get_lbolt() - scn->scn_last_checkpoint >
3253 SEC_TO_TICK(zfs_scan_checkpoint_intval)) {
3254 if (!scn->scn_checkpointing)
3255 zfs_dbgmsg("begin scan checkpoint");
1819
3256
1820 if (scn->scn_phys.scn_ddt_bookmark.ddb_class <=
1821 scn->scn_phys.scn_ddt_class_max) {
1822 zfs_dbgmsg("doing scan sync txg %llu; "
1823 "ddt bm=%llu/%llu/%llu/%llx",
1824 (longlong_t)tx->tx_txg,
1825 (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_class,
1826 (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_type,
1827 (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_checksum,
1828 (longlong_t)scn->scn_phys.scn_ddt_bookmark.ddb_cursor);
1829 ASSERT(scn->scn_phys.scn_bookmark.zb_objset == 0);
1830 ASSERT(scn->scn_phys.scn_bookmark.zb_object == 0);
1831 ASSERT(scn->scn_phys.scn_bookmark.zb_level == 0);
1832 ASSERT(scn->scn_phys.scn_bookmark.zb_blkid == 0);
3257 scn->scn_checkpointing = B_TRUE;
3258 scn->scn_clearing = B_TRUE;
3259 } else {
3260 boolean_t should_clear = dsl_scan_should_clear(scn);
3261 if (should_clear && !scn->scn_clearing) {
3262 zfs_dbgmsg("begin scan clearing");
3263 scn->scn_clearing = B_TRUE;
3264 } else if (!should_clear && scn->scn_clearing) {
3265 zfs_dbgmsg("finish scan clearing");
3266 scn->scn_clearing = B_FALSE;
3267 }
3268 }
1833 } else {
3269 } else {
1834 zfs_dbgmsg("doing scan sync txg %llu; bm=%llu/%llu/%llu/%llu",
1835 (longlong_t)tx->tx_txg,
1836 (longlong_t)scn->scn_phys.scn_bookmark.zb_objset,
1837 (longlong_t)scn->scn_phys.scn_bookmark.zb_object,
1838 (longlong_t)scn->scn_phys.scn_bookmark.zb_level,
1839 (longlong_t)scn->scn_phys.scn_bookmark.zb_blkid);
3270 ASSERT0(scn->scn_checkpointing);
3271 ASSERT0(scn->scn_clearing);
1840 }
1841
3272 }
3273
1842 scn->scn_zio_root = zio_root(dp->dp_spa, NULL,
1843 NULL, ZIO_FLAG_CANFAIL);
1844 dsl_pool_config_enter(dp, FTAG);
1845 dsl_scan_visit(scn, tx);
1846 dsl_pool_config_exit(dp, FTAG);
1847 (void) zio_wait(scn->scn_zio_root);
1848 scn->scn_zio_root = NULL;
3274 if (!scn->scn_clearing && scn->scn_done_txg == 0) {
3275 /* Need to scan metadata for more blocks to scrub */
3276 dsl_scan_phys_t *scnp = &scn->scn_phys;
3277 taskqid_t prefetch_tqid;
3278 uint64_t bytes_per_leaf = zfs_scan_vdev_limit;
3279 uint64_t nr_leaves = dsl_scan_count_leaves(spa->spa_root_vdev);
1849
3280
1850 zfs_dbgmsg("visited %llu blocks in %llums",
1851 (longlong_t)scn->scn_visited_this_txg,
1852 (longlong_t)NSEC2MSEC(gethrtime() - scn->scn_sync_start_time));
3281 /*
3282 * Calculate the max number of in-flight bytes for pool-wide
3283 * scanning operations (minimum 1MB). Limits for the issuing
3284 * phase are done per top-level vdev and are handled separately.
3285 */
3286 scn->scn_maxinflight_bytes =
3287 MAX(nr_leaves * bytes_per_leaf, 1ULL << 20);
1853
3288
1854 if (!scn->scn_suspending) {
1855 scn->scn_done_txg = tx->tx_txg + 1;
1856 zfs_dbgmsg("txg %llu traversal complete, waiting till txg %llu",
1857 tx->tx_txg, scn->scn_done_txg);
1858 }
1859
1860 if (DSL_SCAN_IS_SCRUB_RESILVER(scn)) {
1861 mutex_enter(&spa->spa_scrub_lock);
1862 while (spa->spa_scrub_inflight > 0) {
1863 cv_wait(&spa->spa_scrub_io_cv,
1864 &spa->spa_scrub_lock);
3289 if (scnp->scn_ddt_bookmark.ddb_class <=
3290 scnp->scn_ddt_class_max) {
3291 ASSERT(ZB_IS_ZERO(&scnp->scn_bookmark));
3292 zfs_dbgmsg("doing scan sync txg %llu; "
3293 "ddt bm=%llu/%llu/%llu/%llx",
3294 (longlong_t)tx->tx_txg,
3295 (longlong_t)scnp->scn_ddt_bookmark.ddb_class,
3296 (longlong_t)scnp->scn_ddt_bookmark.ddb_type,
3297 (longlong_t)scnp->scn_ddt_bookmark.ddb_checksum,
3298 (longlong_t)scnp->scn_ddt_bookmark.ddb_cursor);
3299 } else {
3300 zfs_dbgmsg("doing scan sync txg %llu; "
3301 "bm=%llu/%llu/%llu/%llu",
3302 (longlong_t)tx->tx_txg,
3303 (longlong_t)scnp->scn_bookmark.zb_objset,
3304 (longlong_t)scnp->scn_bookmark.zb_object,
3305 (longlong_t)scnp->scn_bookmark.zb_level,
3306 (longlong_t)scnp->scn_bookmark.zb_blkid);
1865 }
3307 }
1866 mutex_exit(&spa->spa_scrub_lock);
1867 }
1868
3308
1869 dsl_scan_sync_state(scn, tx);
1870}
3309 scn->scn_zio_root = zio_root(dp->dp_spa, NULL,
3310 NULL, ZIO_FLAG_CANFAIL);
1871
3311
1872/*
1873 * This will start a new scan, or restart an existing one.
1874 */
1875void
1876dsl_resilver_restart(dsl_pool_t *dp, uint64_t txg)
1877{
1878 if (txg == 0) {
1879 dmu_tx_t *tx;
1880 tx = dmu_tx_create_dd(dp->dp_mos_dir);
1881 VERIFY(0 == dmu_tx_assign(tx, TXG_WAIT));
3312 scn->scn_prefetch_stop = B_FALSE;
3313 prefetch_tqid = taskq_dispatch(dp->dp_sync_taskq,
3314 dsl_scan_prefetch_thread, scn, TQ_SLEEP);
3315 ASSERT(prefetch_tqid != TASKQID_INVALID);
1882
3316
1883 txg = dmu_tx_get_txg(tx);
1884 dp->dp_scan->scn_restart_txg = txg;
1885 dmu_tx_commit(tx);
1886 } else {
1887 dp->dp_scan->scn_restart_txg = txg;
3317 dsl_pool_config_enter(dp, FTAG);
3318 dsl_scan_visit(scn, tx);
3319 dsl_pool_config_exit(dp, FTAG);
3320
3321 mutex_enter(&dp->dp_spa->spa_scrub_lock);
3322 scn->scn_prefetch_stop = B_TRUE;
3323 cv_broadcast(&spa->spa_scrub_io_cv);
3324 mutex_exit(&dp->dp_spa->spa_scrub_lock);
3325
3326 taskq_wait_id(dp->dp_sync_taskq, prefetch_tqid);
3327 (void) zio_wait(scn->scn_zio_root);
3328 scn->scn_zio_root = NULL;
3329
3330 zfs_dbgmsg("scan visited %llu blocks in %llums "
3331 "(%llu os's, %llu holes, %llu < mintxg, "
3332 "%llu in ddt, %llu > maxtxg)",
3333 (longlong_t)scn->scn_visited_this_txg,
3334 (longlong_t)NSEC2MSEC(gethrtime() -
3335 scn->scn_sync_start_time),
3336 (longlong_t)scn->scn_objsets_visited_this_txg,
3337 (longlong_t)scn->scn_holes_this_txg,
3338 (longlong_t)scn->scn_lt_min_this_txg,
3339 (longlong_t)scn->scn_ddt_contained_this_txg,
3340 (longlong_t)scn->scn_gt_max_this_txg);
3341
3342 if (!scn->scn_suspending) {
3343 ASSERT0(avl_numnodes(&scn->scn_queue));
3344 scn->scn_done_txg = tx->tx_txg + 1;
3345 if (scn->scn_is_sorted) {
3346 scn->scn_checkpointing = B_TRUE;
3347 scn->scn_clearing = B_TRUE;
3348 }
3349 zfs_dbgmsg("scan complete txg %llu",
3350 (longlong_t)tx->tx_txg);
3351 }
3352 } else if (scn->scn_is_sorted && scn->scn_bytes_pending != 0) {
3353 /* need to issue scrubbing IOs from per-vdev queues */
3354 scn->scn_zio_root = zio_root(dp->dp_spa, NULL,
3355 NULL, ZIO_FLAG_CANFAIL);
3356 scan_io_queues_run(scn);
3357 (void) zio_wait(scn->scn_zio_root);
3358 scn->scn_zio_root = NULL;
3359
3360 /* calculate and dprintf the current memory usage */
3361 (void) dsl_scan_should_clear(scn);
3362 dsl_scan_update_stats(scn);
3363
3364 zfs_dbgmsg("scrubbed %llu blocks (%llu segs) in %llums "
3365 "(avg_block_size = %llu, avg_seg_size = %llu)",
3366 (longlong_t)scn->scn_zios_this_txg,
3367 (longlong_t)scn->scn_segs_this_txg,
3368 (longlong_t)NSEC2MSEC(gethrtime() -
3369 scn->scn_sync_start_time),
3370 (longlong_t)scn->scn_avg_zio_size_this_txg,
3371 (longlong_t)scn->scn_avg_seg_size_this_txg);
3372 } else if (scn->scn_done_txg != 0 && scn->scn_done_txg <= tx->tx_txg) {
3373 /* Finished with everything. Mark the scrub as complete */
3374 zfs_dbgmsg("scan issuing complete txg %llu",
3375 (longlong_t)tx->tx_txg);
3376 ASSERT3U(scn->scn_done_txg, !=, 0);
3377 ASSERT0(spa->spa_scrub_inflight);
3378 ASSERT0(scn->scn_bytes_pending);
3379 dsl_scan_done(scn, B_TRUE, tx);
3380 sync_type = SYNC_MANDATORY;
1888 }
3381 }
1889 zfs_dbgmsg("restarting resilver txg=%llu", txg);
1890}
1891
3382
1892boolean_t
1893dsl_scan_resilvering(dsl_pool_t *dp)
1894{
1895 return (dp->dp_scan->scn_phys.scn_state == DSS_SCANNING &&
1896 dp->dp_scan->scn_phys.scn_func == POOL_SCAN_RESILVER);
3383 dsl_scan_sync_state(scn, tx, sync_type);
1897}
1898
3384}
3385
1899/*
1900 * scrub consumers
1901 */
1902
1903static void
3386static void
1904count_block(zfs_all_blkstats_t *zab, const blkptr_t *bp)
3387count_block(dsl_scan_t *scn, zfs_all_blkstats_t *zab, const blkptr_t *bp)
1905{
1906 int i;
1907
3388{
3389 int i;
3390
3391 /* update the spa's stats on how many bytes we have issued */
3392 for (i = 0; i < BP_GET_NDVAS(bp); i++) {
3393 atomic_add_64(&scn->scn_dp->dp_spa->spa_scan_pass_issued,
3394 DVA_GET_ASIZE(&bp->blk_dva[i]));
3395 }
3396
1908 /*
1909 * If we resume after a reboot, zab will be NULL; don't record
1910 * incomplete stats in that case.
1911 */
1912 if (zab == NULL)
1913 return;
1914
3397 /*
3398 * If we resume after a reboot, zab will be NULL; don't record
3399 * incomplete stats in that case.
3400 */
3401 if (zab == NULL)
3402 return;
3403
3404 mutex_enter(&zab->zab_lock);
3405
1915 for (i = 0; i < 4; i++) {
1916 int l = (i < 2) ? BP_GET_LEVEL(bp) : DN_MAX_LEVELS;
1917 int t = (i & 1) ? BP_GET_TYPE(bp) : DMU_OT_TOTAL;
1918 if (t & DMU_OT_NEWTYPE)
1919 t = DMU_OT_OTHER;
1920 zfs_blkstat_t *zb = &zab->zab_type[l][t];
1921 int equal;
1922

--- 18 unchanged lines hidden (view full) ---

1941 DVA_GET_VDEV(&bp->blk_dva[2]));
1942 if (equal == 1)
1943 zb->zb_ditto_2_of_3_samevdev++;
1944 else if (equal == 3)
1945 zb->zb_ditto_3_of_3_samevdev++;
1946 break;
1947 }
1948 }
3406 for (i = 0; i < 4; i++) {
3407 int l = (i < 2) ? BP_GET_LEVEL(bp) : DN_MAX_LEVELS;
3408 int t = (i & 1) ? BP_GET_TYPE(bp) : DMU_OT_TOTAL;
3409 if (t & DMU_OT_NEWTYPE)
3410 t = DMU_OT_OTHER;
3411 zfs_blkstat_t *zb = &zab->zab_type[l][t];
3412 int equal;
3413

--- 18 unchanged lines hidden (view full) ---

3432 DVA_GET_VDEV(&bp->blk_dva[2]));
3433 if (equal == 1)
3434 zb->zb_ditto_2_of_3_samevdev++;
3435 else if (equal == 3)
3436 zb->zb_ditto_3_of_3_samevdev++;
3437 break;
3438 }
3439 }
3440
3441 mutex_exit(&zab->zab_lock);
1949}
1950
1951static void
3442}
3443
3444static void
1952dsl_scan_scrub_done(zio_t *zio)
3445scan_io_queue_insert_impl(dsl_scan_io_queue_t *queue, scan_io_t *sio)
1953{
3446{
1954 spa_t *spa = zio->io_spa;
3447 avl_index_t idx;
3448 int64_t asize = sio->sio_asize;
3449 dsl_scan_t *scn = queue->q_scn;
1955
3450
1956 abd_free(zio->io_abd);
3451 ASSERT(MUTEX_HELD(&queue->q_vd->vdev_scan_io_queue_lock));
1957
3452
1958 mutex_enter(&spa->spa_scrub_lock);
1959 spa->spa_scrub_inflight--;
1960 cv_broadcast(&spa->spa_scrub_io_cv);
3453 if (avl_find(&queue->q_sios_by_addr, sio, &idx) != NULL) {
3454 /* block is already scheduled for reading */
3455 atomic_add_64(&scn->scn_bytes_pending, -asize);
3456 kmem_free(sio, sizeof (*sio));
3457 return;
3458 }
3459 avl_insert(&queue->q_sios_by_addr, sio, idx);
3460 range_tree_add(queue->q_exts_by_addr, sio->sio_offset, asize);
3461}
1961
3462
1962 if (zio->io_error && (zio->io_error != ECKSUM ||
1963 !(zio->io_flags & ZIO_FLAG_SPECULATIVE))) {
1964 spa->spa_dsl_pool->dp_scan->scn_phys.scn_errors++;
3463/*
3464 * Given all the info we got from our metadata scanning process, we
3465 * construct a scan_io_t and insert it into the scan sorting queue. The
3466 * I/O must already be suitable for us to process. This is controlled
3467 * by dsl_scan_enqueue().
3468 */
3469static void
3470scan_io_queue_insert(dsl_scan_io_queue_t *queue, const blkptr_t *bp, int dva_i,
3471 int zio_flags, const zbookmark_phys_t *zb)
3472{
3473 dsl_scan_t *scn = queue->q_scn;
3474 scan_io_t *sio = kmem_zalloc(sizeof (*sio), KM_SLEEP);
3475
3476 ASSERT0(BP_IS_GANG(bp));
3477 ASSERT(MUTEX_HELD(&queue->q_vd->vdev_scan_io_queue_lock));
3478
3479 bp2sio(bp, sio, dva_i);
3480 sio->sio_flags = zio_flags;
3481 sio->sio_zb = *zb;
3482
3483 /*
3484 * Increment the bytes pending counter now so that we can't
3485 * get an integer underflow in case the worker processes the
3486 * zio before we get to incrementing this counter.
3487 */
3488 atomic_add_64(&scn->scn_bytes_pending, sio->sio_asize);
3489
3490 scan_io_queue_insert_impl(queue, sio);
3491}
3492
3493/*
3494 * Given a set of I/O parameters as discovered by the metadata traversal
3495 * process, attempts to place the I/O into the sorted queues (if allowed),
3496 * or immediately executes the I/O.
3497 */
3498static void
3499dsl_scan_enqueue(dsl_pool_t *dp, const blkptr_t *bp, int zio_flags,
3500 const zbookmark_phys_t *zb)
3501{
3502 spa_t *spa = dp->dp_spa;
3503
3504 ASSERT(!BP_IS_EMBEDDED(bp));
3505
3506 /*
3507 * Gang blocks are hard to issue sequentially, so we just issue them
3508 * here immediately instead of queuing them.
3509 */
3510 if (!dp->dp_scan->scn_is_sorted || BP_IS_GANG(bp)) {
3511 scan_exec_io(dp, bp, zio_flags, zb, NULL);
3512 return;
1965 }
3513 }
1966 mutex_exit(&spa->spa_scrub_lock);
3514 for (int i = 0; i < BP_GET_NDVAS(bp); i++) {
3515 dva_t dva;
3516 vdev_t *vdev;
3517
3518 dva = bp->blk_dva[i];
3519 vdev = vdev_lookup_top(spa, DVA_GET_VDEV(&dva));
3520 ASSERT(vdev != NULL);
3521
3522 mutex_enter(&vdev->vdev_scan_io_queue_lock);
3523 if (vdev->vdev_scan_io_queue == NULL)
3524 vdev->vdev_scan_io_queue = scan_io_queue_create(vdev);
3525 ASSERT(dp->dp_scan != NULL);
3526 scan_io_queue_insert(vdev->vdev_scan_io_queue, bp,
3527 i, zio_flags, zb);
3528 mutex_exit(&vdev->vdev_scan_io_queue_lock);
3529 }
1967}
1968
1969static int
1970dsl_scan_scrub_cb(dsl_pool_t *dp,
1971 const blkptr_t *bp, const zbookmark_phys_t *zb)
1972{
1973 dsl_scan_t *scn = dp->dp_scan;
3530}
3531
3532static int
3533dsl_scan_scrub_cb(dsl_pool_t *dp,
3534 const blkptr_t *bp, const zbookmark_phys_t *zb)
3535{
3536 dsl_scan_t *scn = dp->dp_scan;
1974 size_t size = BP_GET_PSIZE(bp);
1975 spa_t *spa = dp->dp_spa;
1976 uint64_t phys_birth = BP_PHYSICAL_BIRTH(bp);
3537 spa_t *spa = dp->dp_spa;
3538 uint64_t phys_birth = BP_PHYSICAL_BIRTH(bp);
3539 size_t psize = BP_GET_PSIZE(bp);
1977 boolean_t needs_io;
1978 int zio_flags = ZIO_FLAG_SCAN_THREAD | ZIO_FLAG_RAW | ZIO_FLAG_CANFAIL;
3540 boolean_t needs_io;
3541 int zio_flags = ZIO_FLAG_SCAN_THREAD | ZIO_FLAG_RAW | ZIO_FLAG_CANFAIL;
1979 unsigned int scan_delay = 0;
1980
3542 int d;
3543
1981 if (phys_birth <= scn->scn_phys.scn_min_txg ||
1982 phys_birth >= scn->scn_phys.scn_max_txg)
1983 return (0);
1984
3544 if (phys_birth <= scn->scn_phys.scn_min_txg ||
3545 phys_birth >= scn->scn_phys.scn_max_txg)
3546 return (0);
3547
1985 count_block(dp->dp_blkstats, bp);
1986
1987 if (BP_IS_EMBEDDED(bp))
3548 if (BP_IS_EMBEDDED(bp)) {
3549 count_block(scn, dp->dp_blkstats, bp);
1988 return (0);
3550 return (0);
3551 }
1989
1990 ASSERT(DSL_SCAN_IS_SCRUB_RESILVER(scn));
1991 if (scn->scn_phys.scn_func == POOL_SCAN_SCRUB) {
1992 zio_flags |= ZIO_FLAG_SCRUB;
1993 needs_io = B_TRUE;
3552
3553 ASSERT(DSL_SCAN_IS_SCRUB_RESILVER(scn));
3554 if (scn->scn_phys.scn_func == POOL_SCAN_SCRUB) {
3555 zio_flags |= ZIO_FLAG_SCRUB;
3556 needs_io = B_TRUE;
1994 scan_delay = zfs_scrub_delay;
1995 } else {
1996 ASSERT3U(scn->scn_phys.scn_func, ==, POOL_SCAN_RESILVER);
1997 zio_flags |= ZIO_FLAG_RESILVER;
1998 needs_io = B_FALSE;
3557 } else {
3558 ASSERT3U(scn->scn_phys.scn_func, ==, POOL_SCAN_RESILVER);
3559 zio_flags |= ZIO_FLAG_RESILVER;
3560 needs_io = B_FALSE;
1999 scan_delay = zfs_resilver_delay;
2000 }
2001
2002 /* If it's an intent log block, failure is expected. */
2003 if (zb->zb_level == ZB_ZIL_LEVEL)
2004 zio_flags |= ZIO_FLAG_SPECULATIVE;
2005
3561 }
3562
3563 /* If it's an intent log block, failure is expected. */
3564 if (zb->zb_level == ZB_ZIL_LEVEL)
3565 zio_flags |= ZIO_FLAG_SPECULATIVE;
3566
2006 for (int d = 0; d < BP_GET_NDVAS(bp); d++) {
2007 vdev_t *vd = vdev_lookup_top(spa,
2008 DVA_GET_VDEV(&bp->blk_dva[d]));
3567 for (d = 0; d < BP_GET_NDVAS(bp); d++) {
3568 const dva_t *dva = &bp->blk_dva[d];
2009
2010 /*
2011 * Keep track of how much data we've examined so that
2012 * zpool(1M) status can make useful progress reports.
2013 */
3569
3570 /*
3571 * Keep track of how much data we've examined so that
3572 * zpool(1M) status can make useful progress reports.
3573 */
2014 scn->scn_phys.scn_examined += DVA_GET_ASIZE(&bp->blk_dva[d]);
2015 spa->spa_scan_pass_exam += DVA_GET_ASIZE(&bp->blk_dva[d]);
3574 scn->scn_phys.scn_examined += DVA_GET_ASIZE(dva);
3575 spa->spa_scan_pass_exam += DVA_GET_ASIZE(dva);
2016
2017 /* if it's a resilver, this may not be in the target range */
3576
3577 /* if it's a resilver, this may not be in the target range */
2018 if (!needs_io) {
2019 if (DVA_GET_GANG(&bp->blk_dva[d])) {
2020 /*
2021 * Gang members may be spread across multiple
2022 * vdevs, so the best estimate we have is the
2023 * scrub range, which has already been checked.
2024 * XXX -- it would be better to change our
2025 * allocation policy to ensure that all
2026 * gang members reside on the same vdev.
2027 */
2028 needs_io = B_TRUE;
2029 } else {
2030 needs_io = vdev_dtl_contains(vd, DTL_PARTIAL,
2031 phys_birth, 1);
2032 }
2033 }
3578 if (!needs_io)
3579 needs_io = dsl_scan_need_resilver(spa, dva, psize,
3580 phys_birth);
2034 }
2035
2036 if (needs_io && !zfs_no_scrub_io) {
3581 }
3582
3583 if (needs_io && !zfs_no_scrub_io) {
2037 vdev_t *rvd = spa->spa_root_vdev;
2038 uint64_t maxinflight = rvd->vdev_children *
2039 MAX(zfs_top_maxinflight, 1);
3584 dsl_scan_enqueue(dp, bp, zio_flags, zb);
3585 } else {
3586 count_block(scn, dp->dp_blkstats, bp);
3587 }
2040
3588
3589 /* do not relocate this block */
3590 return (0);
3591}
3592
3593static void
3594dsl_scan_scrub_done(zio_t *zio)
3595{
3596 spa_t *spa = zio->io_spa;
3597 blkptr_t *bp = zio->io_bp;
3598 dsl_scan_io_queue_t *queue = zio->io_private;
3599
3600 abd_free(zio->io_abd);
3601
3602 if (queue == NULL) {
2041 mutex_enter(&spa->spa_scrub_lock);
3603 mutex_enter(&spa->spa_scrub_lock);
2042 while (spa->spa_scrub_inflight >= maxinflight)
3604 ASSERT3U(spa->spa_scrub_inflight, >=, BP_GET_PSIZE(bp));
3605 spa->spa_scrub_inflight -= BP_GET_PSIZE(bp);
3606 cv_broadcast(&spa->spa_scrub_io_cv);
3607 mutex_exit(&spa->spa_scrub_lock);
3608 } else {
3609 mutex_enter(&queue->q_vd->vdev_scan_io_queue_lock);
3610 ASSERT3U(queue->q_inflight_bytes, >=, BP_GET_PSIZE(bp));
3611 queue->q_inflight_bytes -= BP_GET_PSIZE(bp);
3612 cv_broadcast(&queue->q_zio_cv);
3613 mutex_exit(&queue->q_vd->vdev_scan_io_queue_lock);
3614 }
3615
3616 if (zio->io_error && (zio->io_error != ECKSUM ||
3617 !(zio->io_flags & ZIO_FLAG_SPECULATIVE))) {
3618 atomic_inc_64(&spa->spa_dsl_pool->dp_scan->scn_phys.scn_errors);
3619 }
3620}
3621
3622/*
3623 * Given a scanning zio's information, executes the zio. The zio need
3624 * not necessarily be only sortable, this function simply executes the
3625 * zio, no matter what it is. The optional queue argument allows the
3626 * caller to specify that they want per top level vdev IO rate limiting
3627 * instead of the legacy global limiting.
3628 */
3629static void
3630scan_exec_io(dsl_pool_t *dp, const blkptr_t *bp, int zio_flags,
3631 const zbookmark_phys_t *zb, dsl_scan_io_queue_t *queue)
3632{
3633 spa_t *spa = dp->dp_spa;
3634 dsl_scan_t *scn = dp->dp_scan;
3635 size_t size = BP_GET_PSIZE(bp);
3636 abd_t *data = abd_alloc_for_io(size, B_FALSE);
3637 unsigned int scan_delay = 0;
3638
3639 if (queue == NULL) {
3640 mutex_enter(&spa->spa_scrub_lock);
3641 while (spa->spa_scrub_inflight >= scn->scn_maxinflight_bytes)
2043 cv_wait(&spa->spa_scrub_io_cv, &spa->spa_scrub_lock);
3642 cv_wait(&spa->spa_scrub_io_cv, &spa->spa_scrub_lock);
2044 spa->spa_scrub_inflight++;
3643 spa->spa_scrub_inflight += BP_GET_PSIZE(bp);
2045 mutex_exit(&spa->spa_scrub_lock);
3644 mutex_exit(&spa->spa_scrub_lock);
3645 } else {
3646 kmutex_t *q_lock = &queue->q_vd->vdev_scan_io_queue_lock;
2046
3647
2047 /*
2048 * If we're seeing recent (zfs_scan_idle) "important" I/Os
2049 * then throttle our workload to limit the impact of a scan.
2050 */
2051 if (ddi_get_lbolt64() - spa->spa_last_io <= zfs_scan_idle)
2052 delay(MAX((int)scan_delay, 0));
3648 mutex_enter(q_lock);
3649 while (queue->q_inflight_bytes >= queue->q_maxinflight_bytes)
3650 cv_wait(&queue->q_zio_cv, q_lock);
3651 queue->q_inflight_bytes += BP_GET_PSIZE(bp);
3652 mutex_exit(q_lock);
3653 }
2053
3654
2054 zio_nowait(zio_read(NULL, spa, bp,
2055 abd_alloc_for_io(size, B_FALSE), size, dsl_scan_scrub_done,
2056 NULL, ZIO_PRIORITY_SCRUB, zio_flags, zb));
3655 if (zio_flags & ZIO_FLAG_RESILVER)
3656 scan_delay = zfs_resilver_delay;
3657 else {
3658 ASSERT(zio_flags & ZIO_FLAG_SCRUB);
3659 scan_delay = zfs_scrub_delay;
2057 }
2058
3660 }
3661
2059 /* do not relocate this block */
2060 return (0);
3662 if (scan_delay && (ddi_get_lbolt64() - spa->spa_last_io <= zfs_scan_idle))
3663 delay(MAX((int)scan_delay, 0));
3664
3665 count_block(dp->dp_scan, dp->dp_blkstats, bp);
3666 zio_nowait(zio_read(dp->dp_scan->scn_zio_root, spa, bp, data, size,
3667 dsl_scan_scrub_done, queue, ZIO_PRIORITY_SCRUB, zio_flags, zb));
2061}
2062
2063/*
3668}
3669
3670/*
2064 * Called by the ZFS_IOC_POOL_SCAN ioctl to start a scrub or resilver.
2065 * Can also be called to resume a paused scrub.
3671 * This is the primary extent sorting algorithm. We balance two parameters:
3672 * 1) how many bytes of I/O are in an extent
3673 * 2) how well the extent is filled with I/O (as a fraction of its total size)
3674 * Since we allow extents to have gaps between their constituent I/Os, it's
3675 * possible to have a fairly large extent that contains the same amount of
3676 * I/O bytes than a much smaller extent, which just packs the I/O more tightly.
3677 * The algorithm sorts based on a score calculated from the extent's size,
3678 * the relative fill volume (in %) and a "fill weight" parameter that controls
3679 * the split between whether we prefer larger extents or more well populated
3680 * extents:
3681 *
3682 * SCORE = FILL_IN_BYTES + (FILL_IN_PERCENT * FILL_IN_BYTES * FILL_WEIGHT)
3683 *
3684 * Example:
3685 * 1) assume extsz = 64 MiB
3686 * 2) assume fill = 32 MiB (extent is half full)
3687 * 3) assume fill_weight = 3
3688 * 4) SCORE = 32M + (((32M * 100) / 64M) * 3 * 32M) / 100
3689 * SCORE = 32M + (50 * 3 * 32M) / 100
3690 * SCORE = 32M + (4800M / 100)
3691 * SCORE = 32M + 48M
3692 * ^ ^
3693 * | +--- final total relative fill-based score
3694 * +--------- final total fill-based score
3695 * SCORE = 80M
3696 *
3697 * As can be seen, at fill_ratio=3, the algorithm is slightly biased towards
3698 * extents that are more completely filled (in a 3:2 ratio) vs just larger.
3699 * Note that as an optimization, we replace multiplication and division by
3700 * 100 with bitshifting by 7 (which effecitvely multiplies and divides by 128).
2066 */
3701 */
2067int
2068dsl_scan(dsl_pool_t *dp, pool_scan_func_t func)
3702static int
3703ext_size_compare(const void *x, const void *y)
2069{
3704{
2070 spa_t *spa = dp->dp_spa;
3705 const range_seg_t *rsa = x, *rsb = y;
3706 uint64_t sa = rsa->rs_end - rsa->rs_start,
3707 sb = rsb->rs_end - rsb->rs_start;
3708 uint64_t score_a, score_b;
3709
3710 score_a = rsa->rs_fill + ((((rsa->rs_fill << 7) / sa) *
3711 fill_weight * rsa->rs_fill) >> 7);
3712 score_b = rsb->rs_fill + ((((rsb->rs_fill << 7) / sb) *
3713 fill_weight * rsb->rs_fill) >> 7);
3714
3715 if (score_a > score_b)
3716 return (-1);
3717 if (score_a == score_b) {
3718 if (rsa->rs_start < rsb->rs_start)
3719 return (-1);
3720 if (rsa->rs_start == rsb->rs_start)
3721 return (0);
3722 return (1);
3723 }
3724 return (1);
3725}
3726
3727/*
3728 * Comparator for the q_sios_by_addr tree. Sorting is simply performed
3729 * based on LBA-order (from lowest to highest).
3730 */
3731static int
3732io_addr_compare(const void *x, const void *y)
3733{
3734 const scan_io_t *a = x, *b = y;
3735
3736 if (a->sio_offset < b->sio_offset)
3737 return (-1);
3738 if (a->sio_offset == b->sio_offset)
3739 return (0);
3740 return (1);
3741}
3742
3743/* IO queues are created on demand when they are needed. */
3744static dsl_scan_io_queue_t *
3745scan_io_queue_create(vdev_t *vd)
3746{
3747 dsl_scan_t *scn = vd->vdev_spa->spa_dsl_pool->dp_scan;
3748 dsl_scan_io_queue_t *q = kmem_zalloc(sizeof (*q), KM_SLEEP);
3749
3750 q->q_scn = scn;
3751 q->q_vd = vd;
3752 cv_init(&q->q_zio_cv, NULL, CV_DEFAULT, NULL);
3753 q->q_exts_by_addr = range_tree_create_impl(&rt_avl_ops,
3754 &q->q_exts_by_size, ext_size_compare, zfs_scan_max_ext_gap);
3755 avl_create(&q->q_sios_by_addr, io_addr_compare,
3756 sizeof (scan_io_t), offsetof(scan_io_t, sio_nodes.sio_addr_node));
3757
3758 return (q);
3759}
3760
3761/*
3762 * Destroys a scan queue and all segments and scan_io_t's contained in it.
3763 * No further execution of I/O occurs, anything pending in the queue is
3764 * simply freed without being executed.
3765 */
3766void
3767dsl_scan_io_queue_destroy(dsl_scan_io_queue_t *queue)
3768{
3769 dsl_scan_t *scn = queue->q_scn;
3770 scan_io_t *sio;
3771 void *cookie = NULL;
3772 int64_t bytes_dequeued = 0;
3773
3774 ASSERT(MUTEX_HELD(&queue->q_vd->vdev_scan_io_queue_lock));
3775
3776 while ((sio = avl_destroy_nodes(&queue->q_sios_by_addr, &cookie)) !=
3777 NULL) {
3778 ASSERT(range_tree_contains(queue->q_exts_by_addr,
3779 sio->sio_offset, sio->sio_asize));
3780 bytes_dequeued += sio->sio_asize;
3781 kmem_free(sio, sizeof (*sio));
3782 }
3783
3784 atomic_add_64(&scn->scn_bytes_pending, -bytes_dequeued);
3785 range_tree_vacate(queue->q_exts_by_addr, NULL, queue);
3786 range_tree_destroy(queue->q_exts_by_addr);
3787 avl_destroy(&queue->q_sios_by_addr);
3788 cv_destroy(&queue->q_zio_cv);
3789
3790 kmem_free(queue, sizeof (*queue));
3791}
3792
3793/*
3794 * Properly transfers a dsl_scan_queue_t from `svd' to `tvd'. This is
3795 * called on behalf of vdev_top_transfer when creating or destroying
3796 * a mirror vdev due to zpool attach/detach.
3797 */
3798void
3799dsl_scan_io_queue_vdev_xfer(vdev_t *svd, vdev_t *tvd)
3800{
3801 mutex_enter(&svd->vdev_scan_io_queue_lock);
3802 mutex_enter(&tvd->vdev_scan_io_queue_lock);
3803
3804 VERIFY3P(tvd->vdev_scan_io_queue, ==, NULL);
3805 tvd->vdev_scan_io_queue = svd->vdev_scan_io_queue;
3806 svd->vdev_scan_io_queue = NULL;
3807 if (tvd->vdev_scan_io_queue != NULL)
3808 tvd->vdev_scan_io_queue->q_vd = tvd;
3809
3810 mutex_exit(&tvd->vdev_scan_io_queue_lock);
3811 mutex_exit(&svd->vdev_scan_io_queue_lock);
3812}
3813
3814static void
3815scan_io_queues_destroy(dsl_scan_t *scn)
3816{
3817 vdev_t *rvd = scn->scn_dp->dp_spa->spa_root_vdev;
3818
3819 for (uint64_t i = 0; i < rvd->vdev_children; i++) {
3820 vdev_t *tvd = rvd->vdev_child[i];
3821
3822 mutex_enter(&tvd->vdev_scan_io_queue_lock);
3823 if (tvd->vdev_scan_io_queue != NULL)
3824 dsl_scan_io_queue_destroy(tvd->vdev_scan_io_queue);
3825 tvd->vdev_scan_io_queue = NULL;
3826 mutex_exit(&tvd->vdev_scan_io_queue_lock);
3827 }
3828}
3829
3830static void
3831dsl_scan_freed_dva(spa_t *spa, const blkptr_t *bp, int dva_i)
3832{
3833 dsl_pool_t *dp = spa->spa_dsl_pool;
2071 dsl_scan_t *scn = dp->dp_scan;
3834 dsl_scan_t *scn = dp->dp_scan;
3835 vdev_t *vdev;
3836 kmutex_t *q_lock;
3837 dsl_scan_io_queue_t *queue;
3838 scan_io_t srch, *sio;
3839 avl_index_t idx;
3840 uint64_t start, size;
2072
3841
3842 vdev = vdev_lookup_top(spa, DVA_GET_VDEV(&bp->blk_dva[dva_i]));
3843 ASSERT(vdev != NULL);
3844 q_lock = &vdev->vdev_scan_io_queue_lock;
3845 queue = vdev->vdev_scan_io_queue;
3846
3847 mutex_enter(q_lock);
3848 if (queue == NULL) {
3849 mutex_exit(q_lock);
3850 return;
3851 }
3852
3853 bp2sio(bp, &srch, dva_i);
3854 start = srch.sio_offset;
3855 size = srch.sio_asize;
3856
2073 /*
3857 /*
2074 * Purge all vdev caches and probe all devices. We do this here
2075 * rather than in sync context because this requires a writer lock
2076 * on the spa_config lock, which we can't do from sync context. The
2077 * spa_scrub_reopen flag indicates that vdev_open() should not
2078 * attempt to start another scrub.
3858 * We can find the zio in two states:
3859 * 1) Cold, just sitting in the queue of zio's to be issued at
3860 * some point in the future. In this case, all we do is
3861 * remove the zio from the q_sios_by_addr tree, decrement
3862 * its data volume from the containing range_seg_t and
3863 * resort the q_exts_by_size tree to reflect that the
3864 * range_seg_t has lost some of its 'fill'. We don't shorten
3865 * the range_seg_t - this is usually rare enough not to be
3866 * worth the extra hassle of trying keep track of precise
3867 * extent boundaries.
3868 * 2) Hot, where the zio is currently in-flight in
3869 * dsl_scan_issue_ios. In this case, we can't simply
3870 * reach in and stop the in-flight zio's, so we instead
3871 * block the caller. Eventually, dsl_scan_issue_ios will
3872 * be done with issuing the zio's it gathered and will
3873 * signal us.
2079 */
3874 */
2080 spa_vdev_state_enter(spa, SCL_NONE);
2081 spa->spa_scrub_reopen = B_TRUE;
2082 vdev_reopen(spa->spa_root_vdev);
2083 spa->spa_scrub_reopen = B_FALSE;
2084 (void) spa_vdev_state_exit(spa, NULL, 0);
3875 sio = avl_find(&queue->q_sios_by_addr, &srch, &idx);
3876 if (sio != NULL) {
3877 int64_t asize = sio->sio_asize;
3878 blkptr_t tmpbp;
2085
3879
2086 if (func == POOL_SCAN_SCRUB && dsl_scan_is_paused_scrub(scn)) {
2087 /* got scrub start cmd, resume paused scrub */
2088 int err = dsl_scrub_set_pause_resume(scn->scn_dp,
2089 POOL_SCRUB_NORMAL);
2090 if (err == 0) {
2091 spa_event_notify(spa, NULL, NULL, ESC_ZFS_SCRUB_RESUME);
2092 return (ECANCELED);
2093 }
3880 /* Got it while it was cold in the queue */
3881 ASSERT3U(start, ==, sio->sio_offset);
3882 ASSERT3U(size, ==, asize);
3883 avl_remove(&queue->q_sios_by_addr, sio);
2094
3884
2095 return (SET_ERROR(err));
2096 }
3885 ASSERT(range_tree_contains(queue->q_exts_by_addr, start, size));
3886 range_tree_remove_fill(queue->q_exts_by_addr, start, size);
2097
3887
2098 return (dsl_sync_task(spa_name(spa), dsl_scan_setup_check,
2099 dsl_scan_setup_sync, &func, 0, ZFS_SPACE_CHECK_EXTRA_RESERVED));
3888 /*
3889 * We only update scn_bytes_pending in the cold path,
3890 * otherwise it will already have been accounted for as
3891 * part of the zio's execution.
3892 */
3893 atomic_add_64(&scn->scn_bytes_pending, -asize);
3894
3895 /* count the block as though we issued it */
3896 sio2bp(sio, &tmpbp, dva_i);
3897 count_block(scn, dp->dp_blkstats, &tmpbp);
3898
3899 kmem_free(sio, sizeof (*sio));
3900 }
3901 mutex_exit(q_lock);
2100}
2101
3902}
3903
2102static boolean_t
2103dsl_scan_restarting(dsl_scan_t *scn, dmu_tx_t *tx)
3904/*
3905 * Callback invoked when a zio_free() zio is executing. This needs to be
3906 * intercepted to prevent the zio from deallocating a particular portion
3907 * of disk space and it then getting reallocated and written to, while we
3908 * still have it queued up for processing.
3909 */
3910void
3911dsl_scan_freed(spa_t *spa, const blkptr_t *bp)
2104{
3912{
2105 return (scn->scn_restart_txg != 0 &&
2106 scn->scn_restart_txg <= tx->tx_txg);
3913 dsl_pool_t *dp = spa->spa_dsl_pool;
3914 dsl_scan_t *scn = dp->dp_scan;
3915
3916 ASSERT(!BP_IS_EMBEDDED(bp));
3917 ASSERT(scn != NULL);
3918 if (!dsl_scan_is_running(scn))
3919 return;
3920
3921 for (int i = 0; i < BP_GET_NDVAS(bp); i++)
3922 dsl_scan_freed_dva(spa, bp, i);
2107}
3923}