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 * Copyright 2020 Joshua M. Clulow <josh@sysmgr.org> 28 */ 29 30 #ifndef _SYS_VDEV_IMPL_H 31 #define _SYS_VDEV_IMPL_H 32 33 #include <sys/avl.h> 34 #include <sys/bpobj.h> 35 #include <sys/dmu.h> 36 #include <sys/metaslab.h> 37 #include <sys/nvpair.h> 38 #include <sys/space_map.h> 39 #include <sys/vdev.h> 40 #include <sys/dkio.h> 41 #include <sys/uberblock_impl.h> 42 #include <sys/vdev_indirect_mapping.h> 43 #include <sys/vdev_indirect_births.h> 44 #include <sys/vdev_removal.h> 45 46 #ifdef __cplusplus 47 extern "C" { 48 #endif 49 50 /* 51 * Virtual device descriptors. 52 * 53 * All storage pool operations go through the virtual device framework, 54 * which provides data replication and I/O scheduling. 55 */ 56 57 /* 58 * Forward declarations that lots of things need. 59 */ 60 typedef struct vdev_queue vdev_queue_t; 61 typedef struct vdev_cache vdev_cache_t; 62 typedef struct vdev_cache_entry vdev_cache_entry_t; 63 struct abd; 64 65 extern int zfs_vdev_queue_depth_pct; 66 extern int zfs_vdev_def_queue_depth; 67 extern uint32_t zfs_vdev_async_write_max_active; 68 69 /* 70 * Virtual device operations 71 */ 72 typedef int vdev_open_func_t(vdev_t *vd, uint64_t *size, uint64_t *max_size, 73 uint64_t *ashift); 74 typedef void vdev_close_func_t(vdev_t *vd); 75 typedef uint64_t vdev_asize_func_t(vdev_t *vd, uint64_t psize); 76 typedef void vdev_io_start_func_t(zio_t *zio); 77 typedef void vdev_io_done_func_t(zio_t *zio); 78 typedef void vdev_state_change_func_t(vdev_t *vd, int, int); 79 typedef boolean_t vdev_need_resilver_func_t(vdev_t *vd, uint64_t, size_t); 80 typedef void vdev_hold_func_t(vdev_t *vd); 81 typedef void vdev_rele_func_t(vdev_t *vd); 82 83 typedef void vdev_remap_cb_t(uint64_t inner_offset, vdev_t *vd, 84 uint64_t offset, uint64_t size, void *arg); 85 typedef void vdev_remap_func_t(vdev_t *vd, uint64_t offset, uint64_t size, 86 vdev_remap_cb_t callback, void *arg); 87 typedef int vdev_dumpio_func_t(vdev_t *vd, caddr_t data, size_t size, 88 uint64_t offset, uint64_t origoffset, boolean_t doread, boolean_t isdump); 89 /* 90 * Given a target vdev, translates the logical range "in" to the physical 91 * range "res" 92 */ 93 typedef void vdev_xlation_func_t(vdev_t *cvd, const range_seg64_t *in, 94 range_seg64_t *res); 95 96 typedef struct vdev_ops { 97 vdev_open_func_t *vdev_op_open; 98 vdev_close_func_t *vdev_op_close; 99 vdev_asize_func_t *vdev_op_asize; 100 vdev_io_start_func_t *vdev_op_io_start; 101 vdev_io_done_func_t *vdev_op_io_done; 102 vdev_state_change_func_t *vdev_op_state_change; 103 vdev_need_resilver_func_t *vdev_op_need_resilver; 104 vdev_hold_func_t *vdev_op_hold; 105 vdev_rele_func_t *vdev_op_rele; 106 vdev_remap_func_t *vdev_op_remap; 107 /* 108 * For translating ranges from non-leaf vdevs (e.g. raidz) to leaves. 109 * Used when initializing vdevs. Isn't used by leaf ops. 110 */ 111 vdev_xlation_func_t *vdev_op_xlate; 112 vdev_dumpio_func_t *vdev_op_dumpio; 113 char vdev_op_type[16]; 114 boolean_t vdev_op_leaf; 115 } vdev_ops_t; 116 117 /* 118 * Virtual device properties 119 */ 120 struct vdev_cache_entry { 121 struct abd *ve_abd; 122 uint64_t ve_offset; 123 uint64_t ve_lastused; 124 avl_node_t ve_offset_node; 125 avl_node_t ve_lastused_node; 126 uint32_t ve_hits; 127 uint16_t ve_missed_update; 128 zio_t *ve_fill_io; 129 }; 130 131 struct vdev_cache { 132 avl_tree_t vc_offset_tree; 133 avl_tree_t vc_lastused_tree; 134 kmutex_t vc_lock; 135 }; 136 137 typedef struct vdev_queue_class { 138 uint32_t vqc_active; 139 140 /* 141 * Sorted by offset or timestamp, depending on if the queue is 142 * LBA-ordered vs FIFO. 143 */ 144 avl_tree_t vqc_queued_tree; 145 } vdev_queue_class_t; 146 147 struct vdev_queue { 148 vdev_t *vq_vdev; 149 vdev_queue_class_t vq_class[ZIO_PRIORITY_NUM_QUEUEABLE]; 150 avl_tree_t vq_active_tree; 151 avl_tree_t vq_read_offset_tree; 152 avl_tree_t vq_write_offset_tree; 153 avl_tree_t vq_trim_offset_tree; 154 uint64_t vq_last_offset; 155 hrtime_t vq_io_complete_ts; /* time last i/o completed */ 156 kmutex_t vq_lock; 157 }; 158 159 typedef enum vdev_alloc_bias { 160 VDEV_BIAS_NONE, 161 VDEV_BIAS_LOG, /* dedicated to ZIL data (SLOG) */ 162 VDEV_BIAS_SPECIAL, /* dedicated to ddt, metadata, and small blks */ 163 VDEV_BIAS_DEDUP /* dedicated to dedup metadata */ 164 } vdev_alloc_bias_t; 165 166 167 /* 168 * On-disk indirect vdev state. 169 * 170 * An indirect vdev is described exclusively in the MOS config of a pool. 171 * The config for an indirect vdev includes several fields, which are 172 * accessed in memory by a vdev_indirect_config_t. 173 */ 174 typedef struct vdev_indirect_config { 175 /* 176 * Object (in MOS) which contains the indirect mapping. This object 177 * contains an array of vdev_indirect_mapping_entry_phys_t ordered by 178 * vimep_src. The bonus buffer for this object is a 179 * vdev_indirect_mapping_phys_t. This object is allocated when a vdev 180 * removal is initiated. 181 * 182 * Note that this object can be empty if none of the data on the vdev 183 * has been copied yet. 184 */ 185 uint64_t vic_mapping_object; 186 187 /* 188 * Object (in MOS) which contains the birth times for the mapping 189 * entries. This object contains an array of 190 * vdev_indirect_birth_entry_phys_t sorted by vibe_offset. The bonus 191 * buffer for this object is a vdev_indirect_birth_phys_t. This object 192 * is allocated when a vdev removal is initiated. 193 * 194 * Note that this object can be empty if none of the vdev has yet been 195 * copied. 196 */ 197 uint64_t vic_births_object; 198 199 /* 200 * This is the vdev ID which was removed previous to this vdev, or 201 * UINT64_MAX if there are no previously removed vdevs. 202 */ 203 uint64_t vic_prev_indirect_vdev; 204 } vdev_indirect_config_t; 205 206 /* 207 * Virtual device descriptor 208 */ 209 struct vdev { 210 /* 211 * Common to all vdev types. 212 */ 213 uint64_t vdev_id; /* child number in vdev parent */ 214 uint64_t vdev_guid; /* unique ID for this vdev */ 215 uint64_t vdev_guid_sum; /* self guid + all child guids */ 216 uint64_t vdev_orig_guid; /* orig. guid prior to remove */ 217 uint64_t vdev_asize; /* allocatable device capacity */ 218 uint64_t vdev_min_asize; /* min acceptable asize */ 219 uint64_t vdev_max_asize; /* max acceptable asize */ 220 uint64_t vdev_ashift; /* block alignment shift */ 221 uint64_t vdev_state; /* see VDEV_STATE_* #defines */ 222 uint64_t vdev_prevstate; /* used when reopening a vdev */ 223 vdev_ops_t *vdev_ops; /* vdev operations */ 224 spa_t *vdev_spa; /* spa for this vdev */ 225 void *vdev_tsd; /* type-specific data */ 226 vnode_t *vdev_name_vp; /* vnode for pathname */ 227 vnode_t *vdev_devid_vp; /* vnode for devid */ 228 vdev_t *vdev_top; /* top-level vdev */ 229 vdev_t *vdev_parent; /* parent vdev */ 230 vdev_t **vdev_child; /* array of children */ 231 uint64_t vdev_children; /* number of children */ 232 vdev_stat_t vdev_stat; /* virtual device statistics */ 233 vdev_stat_ex_t vdev_stat_ex; /* extended statistics */ 234 boolean_t vdev_expanding; /* expand the vdev? */ 235 boolean_t vdev_reopening; /* reopen in progress? */ 236 boolean_t vdev_nonrot; /* true if solid state */ 237 int vdev_open_error; /* error on last open */ 238 kthread_t *vdev_open_thread; /* thread opening children */ 239 uint64_t vdev_crtxg; /* txg when top-level was added */ 240 241 /* 242 * Top-level vdev state. 243 */ 244 uint64_t vdev_ms_array; /* metaslab array object */ 245 uint64_t vdev_ms_shift; /* metaslab size shift */ 246 uint64_t vdev_ms_count; /* number of metaslabs */ 247 metaslab_group_t *vdev_mg; /* metaslab group */ 248 metaslab_t **vdev_ms; /* metaslab array */ 249 txg_list_t vdev_ms_list; /* per-txg dirty metaslab lists */ 250 txg_list_t vdev_dtl_list; /* per-txg dirty DTL lists */ 251 txg_node_t vdev_txg_node; /* per-txg dirty vdev linkage */ 252 boolean_t vdev_remove_wanted; /* async remove wanted? */ 253 boolean_t vdev_probe_wanted; /* async probe wanted? */ 254 list_node_t vdev_config_dirty_node; /* config dirty list */ 255 list_node_t vdev_state_dirty_node; /* state dirty list */ 256 uint64_t vdev_deflate_ratio; /* deflation ratio (x512) */ 257 uint64_t vdev_islog; /* is an intent log device */ 258 uint64_t vdev_removing; /* device is being removed? */ 259 boolean_t vdev_ishole; /* is a hole in the namespace */ 260 uint64_t vdev_top_zap; 261 vdev_alloc_bias_t vdev_alloc_bias; /* metaslab allocation bias */ 262 263 /* pool checkpoint related */ 264 space_map_t *vdev_checkpoint_sm; /* contains reserved blocks */ 265 266 /* Initialize related */ 267 boolean_t vdev_initialize_exit_wanted; 268 vdev_initializing_state_t vdev_initialize_state; 269 list_node_t vdev_initialize_node; 270 kthread_t *vdev_initialize_thread; 271 /* Protects vdev_initialize_thread and vdev_initialize_state. */ 272 kmutex_t vdev_initialize_lock; 273 kcondvar_t vdev_initialize_cv; 274 uint64_t vdev_initialize_offset[TXG_SIZE]; 275 uint64_t vdev_initialize_last_offset; 276 range_tree_t *vdev_initialize_tree; /* valid while initializing */ 277 uint64_t vdev_initialize_bytes_est; 278 uint64_t vdev_initialize_bytes_done; 279 time_t vdev_initialize_action_time; /* start and end time */ 280 281 /* TRIM related */ 282 boolean_t vdev_trim_exit_wanted; 283 boolean_t vdev_autotrim_exit_wanted; 284 vdev_trim_state_t vdev_trim_state; 285 list_node_t vdev_trim_node; 286 kmutex_t vdev_autotrim_lock; 287 kcondvar_t vdev_autotrim_cv; 288 kthread_t *vdev_autotrim_thread; 289 /* Protects vdev_trim_thread and vdev_trim_state. */ 290 kmutex_t vdev_trim_lock; 291 kcondvar_t vdev_trim_cv; 292 kthread_t *vdev_trim_thread; 293 uint64_t vdev_trim_offset[TXG_SIZE]; 294 uint64_t vdev_trim_last_offset; 295 uint64_t vdev_trim_bytes_est; 296 uint64_t vdev_trim_bytes_done; 297 uint64_t vdev_trim_rate; /* requested rate (bytes/sec) */ 298 uint64_t vdev_trim_partial; /* requested partial TRIM */ 299 uint64_t vdev_trim_secure; /* requested secure TRIM */ 300 time_t vdev_trim_action_time; /* start and end time */ 301 302 /* The following is not in ZoL, but used for auto-trim test progress */ 303 uint64_t vdev_autotrim_bytes_done; 304 305 /* for limiting outstanding I/Os (initialize and TRIM) */ 306 kmutex_t vdev_initialize_io_lock; 307 kcondvar_t vdev_initialize_io_cv; 308 uint64_t vdev_initialize_inflight; 309 kmutex_t vdev_trim_io_lock; 310 kcondvar_t vdev_trim_io_cv; 311 uint64_t vdev_trim_inflight[2]; 312 313 /* 314 * Values stored in the config for an indirect or removing vdev. 315 */ 316 vdev_indirect_config_t vdev_indirect_config; 317 318 /* 319 * The vdev_indirect_rwlock protects the vdev_indirect_mapping 320 * pointer from changing on indirect vdevs (when it is condensed). 321 * Note that removing (not yet indirect) vdevs have different 322 * access patterns (the mapping is not accessed from open context, 323 * e.g. from zio_read) and locking strategy (e.g. svr_lock). 324 */ 325 krwlock_t vdev_indirect_rwlock; 326 vdev_indirect_mapping_t *vdev_indirect_mapping; 327 vdev_indirect_births_t *vdev_indirect_births; 328 329 /* 330 * In memory data structures used to manage the obsolete sm, for 331 * indirect or removing vdevs. 332 * 333 * The vdev_obsolete_segments is the in-core record of the segments 334 * that are no longer referenced anywhere in the pool (due to 335 * being freed or remapped and not referenced by any snapshots). 336 * During a sync, segments are added to vdev_obsolete_segments 337 * via vdev_indirect_mark_obsolete(); at the end of each sync 338 * pass, this is appended to vdev_obsolete_sm via 339 * vdev_indirect_sync_obsolete(). The vdev_obsolete_lock 340 * protects against concurrent modifications of vdev_obsolete_segments 341 * from multiple zio threads. 342 */ 343 kmutex_t vdev_obsolete_lock; 344 range_tree_t *vdev_obsolete_segments; 345 space_map_t *vdev_obsolete_sm; 346 347 /* 348 * Protects the vdev_scan_io_queue field itself as well as the 349 * structure's contents (when present). 350 */ 351 kmutex_t vdev_scan_io_queue_lock; 352 struct dsl_scan_io_queue *vdev_scan_io_queue; 353 354 /* 355 * Leaf vdev state. 356 */ 357 range_tree_t *vdev_dtl[DTL_TYPES]; /* dirty time logs */ 358 space_map_t *vdev_dtl_sm; /* dirty time log space map */ 359 txg_node_t vdev_dtl_node; /* per-txg dirty DTL linkage */ 360 uint64_t vdev_dtl_object; /* DTL object */ 361 uint64_t vdev_psize; /* physical device capacity */ 362 uint64_t vdev_wholedisk; /* true if this is a whole disk */ 363 uint64_t vdev_offline; /* persistent offline state */ 364 uint64_t vdev_faulted; /* persistent faulted state */ 365 uint64_t vdev_degraded; /* persistent degraded state */ 366 uint64_t vdev_removed; /* persistent removed state */ 367 uint64_t vdev_resilver_txg; /* persistent resilvering state */ 368 uint64_t vdev_nparity; /* number of parity devices for raidz */ 369 char *vdev_path; /* vdev path (if any) */ 370 char *vdev_devid; /* vdev devid (if any) */ 371 char *vdev_physpath; /* vdev device path (if any) */ 372 char *vdev_fru; /* physical FRU location */ 373 uint64_t vdev_not_present; /* not present during import */ 374 uint64_t vdev_unspare; /* unspare when resilvering done */ 375 boolean_t vdev_nowritecache; /* true if flushwritecache failed */ 376 boolean_t vdev_has_trim; /* TRIM is supported */ 377 boolean_t vdev_has_securetrim; /* secure TRIM is supported */ 378 boolean_t vdev_checkremove; /* temporary online test */ 379 boolean_t vdev_forcefault; /* force online fault */ 380 boolean_t vdev_splitting; /* split or repair in progress */ 381 boolean_t vdev_delayed_close; /* delayed device close? */ 382 boolean_t vdev_tmpoffline; /* device taken offline temporarily? */ 383 boolean_t vdev_detached; /* device detached? */ 384 boolean_t vdev_cant_read; /* vdev is failing all reads */ 385 boolean_t vdev_cant_write; /* vdev is failing all writes */ 386 boolean_t vdev_isspare; /* was a hot spare */ 387 boolean_t vdev_isl2cache; /* was a l2cache device */ 388 boolean_t vdev_resilver_deferred; /* resilver deferred */ 389 vdev_queue_t vdev_queue; /* I/O deadline schedule queue */ 390 vdev_cache_t vdev_cache; /* physical block cache */ 391 spa_aux_vdev_t *vdev_aux; /* for l2cache and spares vdevs */ 392 zio_t *vdev_probe_zio; /* root of current probe */ 393 vdev_aux_t vdev_label_aux; /* on-disk aux state */ 394 uint64_t vdev_leaf_zap; 395 hrtime_t vdev_mmp_pending; /* 0 if write finished */ 396 uint64_t vdev_mmp_kstat_id; /* to find kstat entry */ 397 list_node_t vdev_leaf_node; /* leaf vdev list */ 398 399 /* 400 * For DTrace to work in userland (libzpool) context, these fields must 401 * remain at the end of the structure. DTrace will use the kernel's 402 * CTF definition for 'struct vdev', and since the size of a kmutex_t is 403 * larger in userland, the offsets for the rest of the fields would be 404 * incorrect. 405 */ 406 kmutex_t vdev_dtl_lock; /* vdev_dtl_{map,resilver} */ 407 kmutex_t vdev_stat_lock; /* vdev_stat */ 408 kmutex_t vdev_probe_lock; /* protects vdev_probe_zio */ 409 }; 410 411 #define VDEV_RAIDZ_MAXPARITY 3 412 413 #define VDEV_PAD_SIZE (8 << 10) 414 /* 2 padding areas (vl_pad1 and vl_pad2) to skip */ 415 #define VDEV_SKIP_SIZE VDEV_PAD_SIZE * 2 416 #define VDEV_PHYS_SIZE (112 << 10) 417 #define VDEV_UBERBLOCK_RING (128 << 10) 418 419 /* 420 * MMP blocks occupy the last MMP_BLOCKS_PER_LABEL slots in the uberblock 421 * ring when MMP is enabled. 422 */ 423 #define MMP_BLOCKS_PER_LABEL 1 424 425 /* The largest uberblock we support is 8k. */ 426 #define MAX_UBERBLOCK_SHIFT (13) 427 #define VDEV_UBERBLOCK_SHIFT(vd) \ 428 MIN(MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT), \ 429 MAX_UBERBLOCK_SHIFT) 430 #define VDEV_UBERBLOCK_COUNT(vd) \ 431 (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd)) 432 #define VDEV_UBERBLOCK_OFFSET(vd, n) \ 433 offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)]) 434 #define VDEV_UBERBLOCK_SIZE(vd) (1ULL << VDEV_UBERBLOCK_SHIFT(vd)) 435 436 typedef struct vdev_phys { 437 char vp_nvlist[VDEV_PHYS_SIZE - sizeof (zio_eck_t)]; 438 zio_eck_t vp_zbt; 439 } vdev_phys_t; 440 441 typedef struct vdev_label { 442 char vl_pad1[VDEV_PAD_SIZE]; /* 8K */ 443 char vl_pad2[VDEV_PAD_SIZE]; /* 8K */ 444 vdev_phys_t vl_vdev_phys; /* 112K */ 445 char vl_uberblock[VDEV_UBERBLOCK_RING]; /* 128K */ 446 } vdev_label_t; /* 256K total */ 447 448 /* 449 * vdev_dirty() flags 450 */ 451 #define VDD_METASLAB 0x01 452 #define VDD_DTL 0x02 453 454 /* Offset of embedded boot loader region on each label */ 455 #define VDEV_BOOT_OFFSET (2 * sizeof (vdev_label_t)) 456 /* 457 * Size of embedded boot loader region on each label. 458 * The total size of the first two labels plus the boot area is 4MB. 459 */ 460 #define VDEV_BOOT_SIZE (7ULL << 19) /* 3.5M */ 461 462 /* 463 * Size of label regions at the start and end of each leaf device. 464 */ 465 #define VDEV_LABEL_START_SIZE (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE) 466 #define VDEV_LABEL_END_SIZE (2 * sizeof (vdev_label_t)) 467 #define VDEV_LABELS 4 468 #define VDEV_BEST_LABEL VDEV_LABELS 469 470 #define VDEV_ALLOC_LOAD 0 471 #define VDEV_ALLOC_ADD 1 472 #define VDEV_ALLOC_SPARE 2 473 #define VDEV_ALLOC_L2CACHE 3 474 #define VDEV_ALLOC_ROOTPOOL 4 475 #define VDEV_ALLOC_SPLIT 5 476 #define VDEV_ALLOC_ATTACH 6 477 478 /* 479 * Allocate or free a vdev 480 */ 481 extern vdev_t *vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid, 482 vdev_ops_t *ops); 483 extern int vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *config, 484 vdev_t *parent, uint_t id, int alloctype); 485 extern void vdev_free(vdev_t *vd); 486 487 /* 488 * Add or remove children and parents 489 */ 490 extern void vdev_add_child(vdev_t *pvd, vdev_t *cvd); 491 extern void vdev_remove_child(vdev_t *pvd, vdev_t *cvd); 492 extern void vdev_compact_children(vdev_t *pvd); 493 extern vdev_t *vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops); 494 extern void vdev_remove_parent(vdev_t *cvd); 495 496 /* 497 * vdev sync load and sync 498 */ 499 extern boolean_t vdev_log_state_valid(vdev_t *vd); 500 extern int vdev_load(vdev_t *vd); 501 extern int vdev_dtl_load(vdev_t *vd); 502 extern void vdev_sync(vdev_t *vd, uint64_t txg); 503 extern void vdev_sync_done(vdev_t *vd, uint64_t txg); 504 extern void vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg); 505 extern void vdev_dirty_leaves(vdev_t *vd, int flags, uint64_t txg); 506 507 /* 508 * Available vdev types. 509 */ 510 extern vdev_ops_t vdev_root_ops; 511 extern vdev_ops_t vdev_mirror_ops; 512 extern vdev_ops_t vdev_replacing_ops; 513 extern vdev_ops_t vdev_raidz_ops; 514 extern vdev_ops_t vdev_disk_ops; 515 extern vdev_ops_t vdev_file_ops; 516 extern vdev_ops_t vdev_missing_ops; 517 extern vdev_ops_t vdev_hole_ops; 518 extern vdev_ops_t vdev_spare_ops; 519 extern vdev_ops_t vdev_indirect_ops; 520 521 /* 522 * Common size functions 523 */ 524 extern void vdev_default_xlate(vdev_t *vd, const range_seg64_t *in, 525 range_seg64_t *out); 526 extern uint64_t vdev_default_asize(vdev_t *vd, uint64_t psize); 527 extern uint64_t vdev_get_min_asize(vdev_t *vd); 528 extern void vdev_set_min_asize(vdev_t *vd); 529 530 /* 531 * Global variables 532 */ 533 extern int zfs_vdev_standard_sm_blksz; 534 /* zdb uses this tunable, so it must be declared here to make lint happy. */ 535 extern int zfs_vdev_cache_size; 536 537 /* 538 * Functions from vdev_indirect.c 539 */ 540 extern void vdev_indirect_sync_obsolete(vdev_t *vd, dmu_tx_t *tx); 541 extern boolean_t vdev_indirect_should_condense(vdev_t *vd); 542 extern void spa_condense_indirect_start_sync(vdev_t *vd, dmu_tx_t *tx); 543 extern int vdev_obsolete_sm_object(vdev_t *vd); 544 extern boolean_t vdev_obsolete_counts_are_precise(vdev_t *vd); 545 546 /* 547 * Other miscellaneous functions 548 */ 549 int vdev_checkpoint_sm_object(vdev_t *vd); 550 551 /* 552 * The vdev_buf_t is used to translate between zio_t and buf_t, and back again. 553 */ 554 typedef struct vdev_buf { 555 buf_t vb_buf; /* buffer that describes the io */ 556 zio_t *vb_io; /* pointer back to the original zio_t */ 557 } vdev_buf_t; 558 559 /* 560 * Support routines used during boot from a ZFS pool 561 */ 562 extern int vdev_disk_read_rootlabel(const char *, const char *, nvlist_t **); 563 extern void vdev_disk_preroot_init(void); 564 extern void vdev_disk_preroot_fini(void); 565 extern const char *vdev_disk_preroot_lookup(uint64_t, uint64_t); 566 567 #ifdef __cplusplus 568 } 569 #endif 570 571 #endif /* _SYS_VDEV_IMPL_H */ 572