1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 * Copyright (c) 2011, 2018 by Delphix. All rights reserved. 24 * Copyright (c) 2011, 2019 by Delphix. All rights reserved. 25 * Copyright (c) 2017, Intel Corporation. 26 * Copyright 2019 Joyent, Inc. 27 */ 28 29 #ifndef _SYS_VDEV_IMPL_H 30 #define _SYS_VDEV_IMPL_H 31 32 #include <sys/avl.h> 33 #include <sys/bpobj.h> 34 #include <sys/dmu.h> 35 #include <sys/metaslab.h> 36 #include <sys/nvpair.h> 37 #include <sys/space_map.h> 38 #include <sys/vdev.h> 39 #include <sys/dkio.h> 40 #include <sys/uberblock_impl.h> 41 #include <sys/vdev_indirect_mapping.h> 42 #include <sys/vdev_indirect_births.h> 43 #include <sys/vdev_removal.h> 44 45 #ifdef __cplusplus 46 extern "C" { 47 #endif 48 49 /* 50 * Virtual device descriptors. 51 * 52 * All storage pool operations go through the virtual device framework, 53 * which provides data replication and I/O scheduling. 54 */ 55 56 /* 57 * Forward declarations that lots of things need. 58 */ 59 typedef struct vdev_queue vdev_queue_t; 60 typedef struct vdev_cache vdev_cache_t; 61 typedef struct vdev_cache_entry vdev_cache_entry_t; 62 struct abd; 63 64 extern int zfs_vdev_queue_depth_pct; 65 extern int zfs_vdev_def_queue_depth; 66 extern uint32_t zfs_vdev_async_write_max_active; 67 68 /* 69 * Virtual device operations 70 */ 71 typedef int vdev_open_func_t(vdev_t *vd, uint64_t *size, uint64_t *max_size, 72 uint64_t *ashift); 73 typedef void vdev_close_func_t(vdev_t *vd); 74 typedef uint64_t vdev_asize_func_t(vdev_t *vd, uint64_t psize); 75 typedef void vdev_io_start_func_t(zio_t *zio); 76 typedef void vdev_io_done_func_t(zio_t *zio); 77 typedef void vdev_state_change_func_t(vdev_t *vd, int, int); 78 typedef boolean_t vdev_need_resilver_func_t(vdev_t *vd, uint64_t, size_t); 79 typedef void vdev_hold_func_t(vdev_t *vd); 80 typedef void vdev_rele_func_t(vdev_t *vd); 81 82 typedef void vdev_remap_cb_t(uint64_t inner_offset, vdev_t *vd, 83 uint64_t offset, uint64_t size, void *arg); 84 typedef void vdev_remap_func_t(vdev_t *vd, uint64_t offset, uint64_t size, 85 vdev_remap_cb_t callback, void *arg); 86 /* 87 * Given a target vdev, translates the logical range "in" to the physical 88 * range "res" 89 */ 90 typedef void vdev_xlation_func_t(vdev_t *cvd, const range_seg64_t *in, 91 range_seg64_t *res); 92 93 typedef struct vdev_ops { 94 vdev_open_func_t *vdev_op_open; 95 vdev_close_func_t *vdev_op_close; 96 vdev_asize_func_t *vdev_op_asize; 97 vdev_io_start_func_t *vdev_op_io_start; 98 vdev_io_done_func_t *vdev_op_io_done; 99 vdev_state_change_func_t *vdev_op_state_change; 100 vdev_need_resilver_func_t *vdev_op_need_resilver; 101 vdev_hold_func_t *vdev_op_hold; 102 vdev_rele_func_t *vdev_op_rele; 103 vdev_remap_func_t *vdev_op_remap; 104 /* 105 * For translating ranges from non-leaf vdevs (e.g. raidz) to leaves. 106 * Used when initializing vdevs. Isn't used by leaf ops. 107 */ 108 vdev_xlation_func_t *vdev_op_xlate; 109 char vdev_op_type[16]; 110 boolean_t vdev_op_leaf; 111 } vdev_ops_t; 112 113 /* 114 * Virtual device properties 115 */ 116 struct vdev_cache_entry { 117 struct abd *ve_abd; 118 uint64_t ve_offset; 119 uint64_t ve_lastused; 120 avl_node_t ve_offset_node; 121 avl_node_t ve_lastused_node; 122 uint32_t ve_hits; 123 uint16_t ve_missed_update; 124 zio_t *ve_fill_io; 125 }; 126 127 struct vdev_cache { 128 avl_tree_t vc_offset_tree; 129 avl_tree_t vc_lastused_tree; 130 kmutex_t vc_lock; 131 }; 132 133 typedef struct vdev_queue_class { 134 uint32_t vqc_active; 135 136 /* 137 * Sorted by offset or timestamp, depending on if the queue is 138 * LBA-ordered vs FIFO. 139 */ 140 avl_tree_t vqc_queued_tree; 141 } vdev_queue_class_t; 142 143 struct vdev_queue { 144 vdev_t *vq_vdev; 145 vdev_queue_class_t vq_class[ZIO_PRIORITY_NUM_QUEUEABLE]; 146 avl_tree_t vq_active_tree; 147 avl_tree_t vq_read_offset_tree; 148 avl_tree_t vq_write_offset_tree; 149 avl_tree_t vq_trim_offset_tree; 150 uint64_t vq_last_offset; 151 hrtime_t vq_io_complete_ts; /* time last i/o completed */ 152 kmutex_t vq_lock; 153 }; 154 155 typedef enum vdev_alloc_bias { 156 VDEV_BIAS_NONE, 157 VDEV_BIAS_LOG, /* dedicated to ZIL data (SLOG) */ 158 VDEV_BIAS_SPECIAL, /* dedicated to ddt, metadata, and small blks */ 159 VDEV_BIAS_DEDUP /* dedicated to dedup metadata */ 160 } vdev_alloc_bias_t; 161 162 163 /* 164 * On-disk indirect vdev state. 165 * 166 * An indirect vdev is described exclusively in the MOS config of a pool. 167 * The config for an indirect vdev includes several fields, which are 168 * accessed in memory by a vdev_indirect_config_t. 169 */ 170 typedef struct vdev_indirect_config { 171 /* 172 * Object (in MOS) which contains the indirect mapping. This object 173 * contains an array of vdev_indirect_mapping_entry_phys_t ordered by 174 * vimep_src. The bonus buffer for this object is a 175 * vdev_indirect_mapping_phys_t. This object is allocated when a vdev 176 * removal is initiated. 177 * 178 * Note that this object can be empty if none of the data on the vdev 179 * has been copied yet. 180 */ 181 uint64_t vic_mapping_object; 182 183 /* 184 * Object (in MOS) which contains the birth times for the mapping 185 * entries. This object contains an array of 186 * vdev_indirect_birth_entry_phys_t sorted by vibe_offset. The bonus 187 * buffer for this object is a vdev_indirect_birth_phys_t. This object 188 * is allocated when a vdev removal is initiated. 189 * 190 * Note that this object can be empty if none of the vdev has yet been 191 * copied. 192 */ 193 uint64_t vic_births_object; 194 195 /* 196 * This is the vdev ID which was removed previous to this vdev, or 197 * UINT64_MAX if there are no previously removed vdevs. 198 */ 199 uint64_t vic_prev_indirect_vdev; 200 } vdev_indirect_config_t; 201 202 /* 203 * Virtual device descriptor 204 */ 205 struct vdev { 206 /* 207 * Common to all vdev types. 208 */ 209 uint64_t vdev_id; /* child number in vdev parent */ 210 uint64_t vdev_guid; /* unique ID for this vdev */ 211 uint64_t vdev_guid_sum; /* self guid + all child guids */ 212 uint64_t vdev_orig_guid; /* orig. guid prior to remove */ 213 uint64_t vdev_asize; /* allocatable device capacity */ 214 uint64_t vdev_min_asize; /* min acceptable asize */ 215 uint64_t vdev_max_asize; /* max acceptable asize */ 216 uint64_t vdev_ashift; /* block alignment shift */ 217 uint64_t vdev_state; /* see VDEV_STATE_* #defines */ 218 uint64_t vdev_prevstate; /* used when reopening a vdev */ 219 vdev_ops_t *vdev_ops; /* vdev operations */ 220 spa_t *vdev_spa; /* spa for this vdev */ 221 void *vdev_tsd; /* type-specific data */ 222 vnode_t *vdev_name_vp; /* vnode for pathname */ 223 vnode_t *vdev_devid_vp; /* vnode for devid */ 224 vdev_t *vdev_top; /* top-level vdev */ 225 vdev_t *vdev_parent; /* parent vdev */ 226 vdev_t **vdev_child; /* array of children */ 227 uint64_t vdev_children; /* number of children */ 228 vdev_stat_t vdev_stat; /* virtual device statistics */ 229 boolean_t vdev_expanding; /* expand the vdev? */ 230 boolean_t vdev_reopening; /* reopen in progress? */ 231 boolean_t vdev_nonrot; /* true if solid state */ 232 int vdev_open_error; /* error on last open */ 233 kthread_t *vdev_open_thread; /* thread opening children */ 234 uint64_t vdev_crtxg; /* txg when top-level was added */ 235 236 /* 237 * Top-level vdev state. 238 */ 239 uint64_t vdev_ms_array; /* metaslab array object */ 240 uint64_t vdev_ms_shift; /* metaslab size shift */ 241 uint64_t vdev_ms_count; /* number of metaslabs */ 242 metaslab_group_t *vdev_mg; /* metaslab group */ 243 metaslab_t **vdev_ms; /* metaslab array */ 244 txg_list_t vdev_ms_list; /* per-txg dirty metaslab lists */ 245 txg_list_t vdev_dtl_list; /* per-txg dirty DTL lists */ 246 txg_node_t vdev_txg_node; /* per-txg dirty vdev linkage */ 247 boolean_t vdev_remove_wanted; /* async remove wanted? */ 248 boolean_t vdev_probe_wanted; /* async probe wanted? */ 249 list_node_t vdev_config_dirty_node; /* config dirty list */ 250 list_node_t vdev_state_dirty_node; /* state dirty list */ 251 uint64_t vdev_deflate_ratio; /* deflation ratio (x512) */ 252 uint64_t vdev_islog; /* is an intent log device */ 253 uint64_t vdev_removing; /* device is being removed? */ 254 boolean_t vdev_ishole; /* is a hole in the namespace */ 255 uint64_t vdev_top_zap; 256 vdev_alloc_bias_t vdev_alloc_bias; /* metaslab allocation bias */ 257 258 /* pool checkpoint related */ 259 space_map_t *vdev_checkpoint_sm; /* contains reserved blocks */ 260 261 /* Initialize related */ 262 boolean_t vdev_initialize_exit_wanted; 263 vdev_initializing_state_t vdev_initialize_state; 264 list_node_t vdev_initialize_node; 265 kthread_t *vdev_initialize_thread; 266 /* Protects vdev_initialize_thread and vdev_initialize_state. */ 267 kmutex_t vdev_initialize_lock; 268 kcondvar_t vdev_initialize_cv; 269 uint64_t vdev_initialize_offset[TXG_SIZE]; 270 uint64_t vdev_initialize_last_offset; 271 range_tree_t *vdev_initialize_tree; /* valid while initializing */ 272 uint64_t vdev_initialize_bytes_est; 273 uint64_t vdev_initialize_bytes_done; 274 time_t vdev_initialize_action_time; /* start and end time */ 275 276 /* TRIM related */ 277 boolean_t vdev_trim_exit_wanted; 278 boolean_t vdev_autotrim_exit_wanted; 279 vdev_trim_state_t vdev_trim_state; 280 list_node_t vdev_trim_node; 281 kmutex_t vdev_autotrim_lock; 282 kcondvar_t vdev_autotrim_cv; 283 kthread_t *vdev_autotrim_thread; 284 /* Protects vdev_trim_thread and vdev_trim_state. */ 285 kmutex_t vdev_trim_lock; 286 kcondvar_t vdev_trim_cv; 287 kthread_t *vdev_trim_thread; 288 uint64_t vdev_trim_offset[TXG_SIZE]; 289 uint64_t vdev_trim_last_offset; 290 uint64_t vdev_trim_bytes_est; 291 uint64_t vdev_trim_bytes_done; 292 uint64_t vdev_trim_rate; /* requested rate (bytes/sec) */ 293 uint64_t vdev_trim_partial; /* requested partial TRIM */ 294 uint64_t vdev_trim_secure; /* requested secure TRIM */ 295 time_t vdev_trim_action_time; /* start and end time */ 296 297 /* The following is not in ZoL, but used for auto-trim test progress */ 298 uint64_t vdev_autotrim_bytes_done; 299 300 /* for limiting outstanding I/Os (initialize and TRIM) */ 301 kmutex_t vdev_initialize_io_lock; 302 kcondvar_t vdev_initialize_io_cv; 303 uint64_t vdev_initialize_inflight; 304 kmutex_t vdev_trim_io_lock; 305 kcondvar_t vdev_trim_io_cv; 306 uint64_t vdev_trim_inflight[2]; 307 308 /* 309 * Values stored in the config for an indirect or removing vdev. 310 */ 311 vdev_indirect_config_t vdev_indirect_config; 312 313 /* 314 * The vdev_indirect_rwlock protects the vdev_indirect_mapping 315 * pointer from changing on indirect vdevs (when it is condensed). 316 * Note that removing (not yet indirect) vdevs have different 317 * access patterns (the mapping is not accessed from open context, 318 * e.g. from zio_read) and locking strategy (e.g. svr_lock). 319 */ 320 krwlock_t vdev_indirect_rwlock; 321 vdev_indirect_mapping_t *vdev_indirect_mapping; 322 vdev_indirect_births_t *vdev_indirect_births; 323 324 /* 325 * In memory data structures used to manage the obsolete sm, for 326 * indirect or removing vdevs. 327 * 328 * The vdev_obsolete_segments is the in-core record of the segments 329 * that are no longer referenced anywhere in the pool (due to 330 * being freed or remapped and not referenced by any snapshots). 331 * During a sync, segments are added to vdev_obsolete_segments 332 * via vdev_indirect_mark_obsolete(); at the end of each sync 333 * pass, this is appended to vdev_obsolete_sm via 334 * vdev_indirect_sync_obsolete(). The vdev_obsolete_lock 335 * protects against concurrent modifications of vdev_obsolete_segments 336 * from multiple zio threads. 337 */ 338 kmutex_t vdev_obsolete_lock; 339 range_tree_t *vdev_obsolete_segments; 340 space_map_t *vdev_obsolete_sm; 341 342 /* 343 * Protects the vdev_scan_io_queue field itself as well as the 344 * structure's contents (when present). 345 */ 346 kmutex_t vdev_scan_io_queue_lock; 347 struct dsl_scan_io_queue *vdev_scan_io_queue; 348 349 /* 350 * Leaf vdev state. 351 */ 352 range_tree_t *vdev_dtl[DTL_TYPES]; /* dirty time logs */ 353 space_map_t *vdev_dtl_sm; /* dirty time log space map */ 354 txg_node_t vdev_dtl_node; /* per-txg dirty DTL linkage */ 355 uint64_t vdev_dtl_object; /* DTL object */ 356 uint64_t vdev_psize; /* physical device capacity */ 357 uint64_t vdev_wholedisk; /* true if this is a whole disk */ 358 uint64_t vdev_offline; /* persistent offline state */ 359 uint64_t vdev_faulted; /* persistent faulted state */ 360 uint64_t vdev_degraded; /* persistent degraded state */ 361 uint64_t vdev_removed; /* persistent removed state */ 362 uint64_t vdev_resilver_txg; /* persistent resilvering state */ 363 uint64_t vdev_nparity; /* number of parity devices for raidz */ 364 char *vdev_path; /* vdev path (if any) */ 365 char *vdev_devid; /* vdev devid (if any) */ 366 char *vdev_physpath; /* vdev device path (if any) */ 367 char *vdev_fru; /* physical FRU location */ 368 uint64_t vdev_not_present; /* not present during import */ 369 uint64_t vdev_unspare; /* unspare when resilvering done */ 370 boolean_t vdev_nowritecache; /* true if flushwritecache failed */ 371 boolean_t vdev_has_trim; /* TRIM is supported */ 372 boolean_t vdev_has_securetrim; /* secure TRIM is supported */ 373 boolean_t vdev_checkremove; /* temporary online test */ 374 boolean_t vdev_forcefault; /* force online fault */ 375 boolean_t vdev_splitting; /* split or repair in progress */ 376 boolean_t vdev_delayed_close; /* delayed device close? */ 377 boolean_t vdev_tmpoffline; /* device taken offline temporarily? */ 378 boolean_t vdev_detached; /* device detached? */ 379 boolean_t vdev_cant_read; /* vdev is failing all reads */ 380 boolean_t vdev_cant_write; /* vdev is failing all writes */ 381 boolean_t vdev_isspare; /* was a hot spare */ 382 boolean_t vdev_isl2cache; /* was a l2cache device */ 383 boolean_t vdev_resilver_deferred; /* resilver deferred */ 384 vdev_queue_t vdev_queue; /* I/O deadline schedule queue */ 385 vdev_cache_t vdev_cache; /* physical block cache */ 386 spa_aux_vdev_t *vdev_aux; /* for l2cache and spares vdevs */ 387 zio_t *vdev_probe_zio; /* root of current probe */ 388 vdev_aux_t vdev_label_aux; /* on-disk aux state */ 389 uint64_t vdev_leaf_zap; 390 hrtime_t vdev_mmp_pending; /* 0 if write finished */ 391 uint64_t vdev_mmp_kstat_id; /* to find kstat entry */ 392 list_node_t vdev_leaf_node; /* leaf vdev list */ 393 394 /* 395 * For DTrace to work in userland (libzpool) context, these fields must 396 * remain at the end of the structure. DTrace will use the kernel's 397 * CTF definition for 'struct vdev', and since the size of a kmutex_t is 398 * larger in userland, the offsets for the rest of the fields would be 399 * incorrect. 400 */ 401 kmutex_t vdev_dtl_lock; /* vdev_dtl_{map,resilver} */ 402 kmutex_t vdev_stat_lock; /* vdev_stat */ 403 kmutex_t vdev_probe_lock; /* protects vdev_probe_zio */ 404 }; 405 406 #define VDEV_RAIDZ_MAXPARITY 3 407 408 #define VDEV_PAD_SIZE (8 << 10) 409 /* 2 padding areas (vl_pad1 and vl_pad2) to skip */ 410 #define VDEV_SKIP_SIZE VDEV_PAD_SIZE * 2 411 #define VDEV_PHYS_SIZE (112 << 10) 412 #define VDEV_UBERBLOCK_RING (128 << 10) 413 414 /* 415 * MMP blocks occupy the last MMP_BLOCKS_PER_LABEL slots in the uberblock 416 * ring when MMP is enabled. 417 */ 418 #define MMP_BLOCKS_PER_LABEL 1 419 420 /* The largest uberblock we support is 8k. */ 421 #define MAX_UBERBLOCK_SHIFT (13) 422 #define VDEV_UBERBLOCK_SHIFT(vd) \ 423 MIN(MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT), \ 424 MAX_UBERBLOCK_SHIFT) 425 #define VDEV_UBERBLOCK_COUNT(vd) \ 426 (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd)) 427 #define VDEV_UBERBLOCK_OFFSET(vd, n) \ 428 offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)]) 429 #define VDEV_UBERBLOCK_SIZE(vd) (1ULL << VDEV_UBERBLOCK_SHIFT(vd)) 430 431 typedef struct vdev_phys { 432 char vp_nvlist[VDEV_PHYS_SIZE - sizeof (zio_eck_t)]; 433 zio_eck_t vp_zbt; 434 } vdev_phys_t; 435 436 typedef struct vdev_label { 437 char vl_pad1[VDEV_PAD_SIZE]; /* 8K */ 438 char vl_pad2[VDEV_PAD_SIZE]; /* 8K */ 439 vdev_phys_t vl_vdev_phys; /* 112K */ 440 char vl_uberblock[VDEV_UBERBLOCK_RING]; /* 128K */ 441 } vdev_label_t; /* 256K total */ 442 443 /* 444 * vdev_dirty() flags 445 */ 446 #define VDD_METASLAB 0x01 447 #define VDD_DTL 0x02 448 449 /* Offset of embedded boot loader region on each label */ 450 #define VDEV_BOOT_OFFSET (2 * sizeof (vdev_label_t)) 451 /* 452 * Size of embedded boot loader region on each label. 453 * The total size of the first two labels plus the boot area is 4MB. 454 */ 455 #define VDEV_BOOT_SIZE (7ULL << 19) /* 3.5M */ 456 457 /* 458 * Size of label regions at the start and end of each leaf device. 459 */ 460 #define VDEV_LABEL_START_SIZE (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE) 461 #define VDEV_LABEL_END_SIZE (2 * sizeof (vdev_label_t)) 462 #define VDEV_LABELS 4 463 #define VDEV_BEST_LABEL VDEV_LABELS 464 465 #define VDEV_ALLOC_LOAD 0 466 #define VDEV_ALLOC_ADD 1 467 #define VDEV_ALLOC_SPARE 2 468 #define VDEV_ALLOC_L2CACHE 3 469 #define VDEV_ALLOC_ROOTPOOL 4 470 #define VDEV_ALLOC_SPLIT 5 471 #define VDEV_ALLOC_ATTACH 6 472 473 /* 474 * Allocate or free a vdev 475 */ 476 extern vdev_t *vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid, 477 vdev_ops_t *ops); 478 extern int vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *config, 479 vdev_t *parent, uint_t id, int alloctype); 480 extern void vdev_free(vdev_t *vd); 481 482 /* 483 * Add or remove children and parents 484 */ 485 extern void vdev_add_child(vdev_t *pvd, vdev_t *cvd); 486 extern void vdev_remove_child(vdev_t *pvd, vdev_t *cvd); 487 extern void vdev_compact_children(vdev_t *pvd); 488 extern vdev_t *vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops); 489 extern void vdev_remove_parent(vdev_t *cvd); 490 491 /* 492 * vdev sync load and sync 493 */ 494 extern boolean_t vdev_log_state_valid(vdev_t *vd); 495 extern int vdev_load(vdev_t *vd); 496 extern int vdev_dtl_load(vdev_t *vd); 497 extern void vdev_sync(vdev_t *vd, uint64_t txg); 498 extern void vdev_sync_done(vdev_t *vd, uint64_t txg); 499 extern void vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg); 500 extern void vdev_dirty_leaves(vdev_t *vd, int flags, uint64_t txg); 501 502 /* 503 * Available vdev types. 504 */ 505 extern vdev_ops_t vdev_root_ops; 506 extern vdev_ops_t vdev_mirror_ops; 507 extern vdev_ops_t vdev_replacing_ops; 508 extern vdev_ops_t vdev_raidz_ops; 509 extern vdev_ops_t vdev_disk_ops; 510 extern vdev_ops_t vdev_file_ops; 511 extern vdev_ops_t vdev_missing_ops; 512 extern vdev_ops_t vdev_hole_ops; 513 extern vdev_ops_t vdev_spare_ops; 514 extern vdev_ops_t vdev_indirect_ops; 515 516 /* 517 * Common size functions 518 */ 519 extern void vdev_default_xlate(vdev_t *vd, const range_seg64_t *in, 520 range_seg64_t *out); 521 extern uint64_t vdev_default_asize(vdev_t *vd, uint64_t psize); 522 extern uint64_t vdev_get_min_asize(vdev_t *vd); 523 extern void vdev_set_min_asize(vdev_t *vd); 524 525 /* 526 * Global variables 527 */ 528 extern int zfs_vdev_standard_sm_blksz; 529 /* zdb uses this tunable, so it must be declared here to make lint happy. */ 530 extern int zfs_vdev_cache_size; 531 532 /* 533 * Functions from vdev_indirect.c 534 */ 535 extern void vdev_indirect_sync_obsolete(vdev_t *vd, dmu_tx_t *tx); 536 extern boolean_t vdev_indirect_should_condense(vdev_t *vd); 537 extern void spa_condense_indirect_start_sync(vdev_t *vd, dmu_tx_t *tx); 538 extern int vdev_obsolete_sm_object(vdev_t *vd); 539 extern boolean_t vdev_obsolete_counts_are_precise(vdev_t *vd); 540 541 /* 542 * Other miscellaneous functions 543 */ 544 int vdev_checkpoint_sm_object(vdev_t *vd); 545 546 /* 547 * The vdev_buf_t is used to translate between zio_t and buf_t, and back again. 548 */ 549 typedef struct vdev_buf { 550 buf_t vb_buf; /* buffer that describes the io */ 551 zio_t *vb_io; /* pointer back to the original zio_t */ 552 } vdev_buf_t; 553 554 #ifdef __cplusplus 555 } 556 #endif 557 558 #endif /* _SYS_VDEV_IMPL_H */ 559