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