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 https://opensource.org/licenses/CDDL-1.0. 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, 2020 by Delphix. All rights reserved. 24 * Copyright (c) 2017, Intel Corporation. 25 */ 26 27 #ifndef _SYS_VDEV_IMPL_H 28 #define _SYS_VDEV_IMPL_H 29 30 #include <sys/avl.h> 31 #include <sys/bpobj.h> 32 #include <sys/dmu.h> 33 #include <sys/metaslab.h> 34 #include <sys/nvpair.h> 35 #include <sys/space_map.h> 36 #include <sys/vdev.h> 37 #include <sys/dkio.h> 38 #include <sys/uberblock_impl.h> 39 #include <sys/vdev_indirect_mapping.h> 40 #include <sys/vdev_indirect_births.h> 41 #include <sys/vdev_rebuild.h> 42 #include <sys/vdev_removal.h> 43 #include <sys/zfs_ratelimit.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 struct abd; 61 62 extern uint_t zfs_vdev_queue_depth_pct; 63 extern uint_t zfs_vdev_def_queue_depth; 64 extern uint_t zfs_vdev_async_write_max_active; 65 66 /* 67 * Virtual device operations 68 */ 69 typedef int vdev_init_func_t(spa_t *spa, nvlist_t *nv, void **tsd); 70 typedef void vdev_kobj_post_evt_func_t(vdev_t *vd); 71 typedef void vdev_fini_func_t(vdev_t *vd); 72 typedef int vdev_open_func_t(vdev_t *vd, uint64_t *size, uint64_t *max_size, 73 uint64_t *ashift, uint64_t *pshift); 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 uint64_t vdev_min_asize_func_t(vdev_t *vd); 77 typedef uint64_t vdev_min_alloc_func_t(vdev_t *vd); 78 typedef void vdev_io_start_func_t(zio_t *zio); 79 typedef void vdev_io_done_func_t(zio_t *zio); 80 typedef void vdev_state_change_func_t(vdev_t *vd, int, int); 81 typedef boolean_t vdev_need_resilver_func_t(vdev_t *vd, const dva_t *dva, 82 size_t psize, uint64_t phys_birth); 83 typedef void vdev_hold_func_t(vdev_t *vd); 84 typedef void vdev_rele_func_t(vdev_t *vd); 85 86 typedef void vdev_remap_cb_t(uint64_t inner_offset, vdev_t *vd, 87 uint64_t offset, uint64_t size, void *arg); 88 typedef void vdev_remap_func_t(vdev_t *vd, uint64_t offset, uint64_t size, 89 vdev_remap_cb_t callback, void *arg); 90 /* 91 * Given a target vdev, translates the logical range "in" to the physical 92 * range "res" 93 */ 94 typedef void vdev_xlation_func_t(vdev_t *cvd, const range_seg64_t *logical, 95 range_seg64_t *physical, range_seg64_t *remain); 96 typedef uint64_t vdev_rebuild_asize_func_t(vdev_t *vd, uint64_t start, 97 uint64_t size, uint64_t max_segment); 98 typedef void vdev_metaslab_init_func_t(vdev_t *vd, uint64_t *startp, 99 uint64_t *sizep); 100 typedef void vdev_config_generate_func_t(vdev_t *vd, nvlist_t *nv); 101 typedef uint64_t vdev_nparity_func_t(vdev_t *vd); 102 typedef uint64_t vdev_ndisks_func_t(vdev_t *vd); 103 104 typedef const struct vdev_ops { 105 vdev_init_func_t *vdev_op_init; 106 vdev_fini_func_t *vdev_op_fini; 107 vdev_open_func_t *vdev_op_open; 108 vdev_close_func_t *vdev_op_close; 109 vdev_asize_func_t *vdev_op_asize; 110 vdev_min_asize_func_t *vdev_op_min_asize; 111 vdev_min_alloc_func_t *vdev_op_min_alloc; 112 vdev_io_start_func_t *vdev_op_io_start; 113 vdev_io_done_func_t *vdev_op_io_done; 114 vdev_state_change_func_t *vdev_op_state_change; 115 vdev_need_resilver_func_t *vdev_op_need_resilver; 116 vdev_hold_func_t *vdev_op_hold; 117 vdev_rele_func_t *vdev_op_rele; 118 vdev_remap_func_t *vdev_op_remap; 119 vdev_xlation_func_t *vdev_op_xlate; 120 vdev_rebuild_asize_func_t *vdev_op_rebuild_asize; 121 vdev_metaslab_init_func_t *vdev_op_metaslab_init; 122 vdev_config_generate_func_t *vdev_op_config_generate; 123 vdev_nparity_func_t *vdev_op_nparity; 124 vdev_ndisks_func_t *vdev_op_ndisks; 125 vdev_kobj_post_evt_func_t *vdev_op_kobj_evt_post; 126 char vdev_op_type[16]; 127 boolean_t vdev_op_leaf; 128 } vdev_ops_t; 129 130 /* 131 * Virtual device properties 132 */ 133 typedef union vdev_queue_class { 134 list_t vqc_list; 135 avl_tree_t vqc_tree; 136 } vdev_queue_class_t; 137 138 struct vdev_queue { 139 vdev_t *vq_vdev; 140 vdev_queue_class_t vq_class[ZIO_PRIORITY_NUM_QUEUEABLE]; 141 avl_tree_t vq_read_offset_tree; 142 avl_tree_t vq_write_offset_tree; 143 uint64_t vq_last_offset; 144 zio_priority_t vq_last_prio; /* Last sent I/O priority. */ 145 uint32_t vq_cqueued; /* Classes with queued I/Os. */ 146 uint32_t vq_cactive[ZIO_PRIORITY_NUM_QUEUEABLE]; 147 uint32_t vq_active; /* Number of active I/Os. */ 148 uint32_t vq_ia_active; /* Active interactive I/Os. */ 149 uint32_t vq_nia_credit; /* Non-interactive I/Os credit. */ 150 list_t vq_active_list; /* List of active I/Os. */ 151 hrtime_t vq_io_complete_ts; /* time last i/o completed */ 152 hrtime_t vq_io_delta_ts; 153 zio_t vq_io_search; /* used as local for stack reduction */ 154 kmutex_t vq_lock; 155 }; 156 157 typedef enum vdev_alloc_bias { 158 VDEV_BIAS_NONE, 159 VDEV_BIAS_LOG, /* dedicated to ZIL data (SLOG) */ 160 VDEV_BIAS_SPECIAL, /* dedicated to ddt, metadata, and small blks */ 161 VDEV_BIAS_DEDUP /* dedicated to dedup metadata */ 162 } vdev_alloc_bias_t; 163 164 165 /* 166 * On-disk indirect vdev state. 167 * 168 * An indirect vdev is described exclusively in the MOS config of a pool. 169 * The config for an indirect vdev includes several fields, which are 170 * accessed in memory by a vdev_indirect_config_t. 171 */ 172 typedef struct vdev_indirect_config { 173 /* 174 * Object (in MOS) which contains the indirect mapping. This object 175 * contains an array of vdev_indirect_mapping_entry_phys_t ordered by 176 * vimep_src. The bonus buffer for this object is a 177 * vdev_indirect_mapping_phys_t. This object is allocated when a vdev 178 * removal is initiated. 179 * 180 * Note that this object can be empty if none of the data on the vdev 181 * has been copied yet. 182 */ 183 uint64_t vic_mapping_object; 184 185 /* 186 * Object (in MOS) which contains the birth times for the mapping 187 * entries. This object contains an array of 188 * vdev_indirect_birth_entry_phys_t sorted by vibe_offset. The bonus 189 * buffer for this object is a vdev_indirect_birth_phys_t. This object 190 * is allocated when a vdev removal is initiated. 191 * 192 * Note that this object can be empty if none of the vdev has yet been 193 * copied. 194 */ 195 uint64_t vic_births_object; 196 197 /* 198 * This is the vdev ID which was removed previous to this vdev, or 199 * UINT64_MAX if there are no previously removed vdevs. 200 */ 201 uint64_t vic_prev_indirect_vdev; 202 } vdev_indirect_config_t; 203 204 /* 205 * Virtual device descriptor 206 */ 207 struct vdev { 208 /* 209 * Common to all vdev types. 210 */ 211 uint64_t vdev_id; /* child number in vdev parent */ 212 uint64_t vdev_guid; /* unique ID for this vdev */ 213 uint64_t vdev_guid_sum; /* self guid + all child guids */ 214 uint64_t vdev_orig_guid; /* orig. guid prior to remove */ 215 uint64_t vdev_asize; /* allocatable device capacity */ 216 uint64_t vdev_min_asize; /* min acceptable asize */ 217 uint64_t vdev_max_asize; /* max acceptable asize */ 218 uint64_t vdev_ashift; /* block alignment shift */ 219 220 /* 221 * Logical block alignment shift 222 * 223 * The smallest sized/aligned I/O supported by the device. 224 */ 225 uint64_t vdev_logical_ashift; 226 /* 227 * Physical block alignment shift 228 * 229 * The device supports logical I/Os with vdev_logical_ashift 230 * size/alignment, but optimum performance will be achieved by 231 * aligning/sizing requests to vdev_physical_ashift. Smaller 232 * requests may be inflated or incur device level read-modify-write 233 * operations. 234 * 235 * May be 0 to indicate no preference (i.e. use vdev_logical_ashift). 236 */ 237 uint64_t vdev_physical_ashift; 238 uint64_t vdev_state; /* see VDEV_STATE_* #defines */ 239 uint64_t vdev_prevstate; /* used when reopening a vdev */ 240 vdev_ops_t *vdev_ops; /* vdev operations */ 241 spa_t *vdev_spa; /* spa for this vdev */ 242 void *vdev_tsd; /* type-specific data */ 243 vdev_t *vdev_top; /* top-level vdev */ 244 vdev_t *vdev_parent; /* parent vdev */ 245 vdev_t **vdev_child; /* array of children */ 246 uint64_t vdev_children; /* number of children */ 247 vdev_stat_t vdev_stat; /* virtual device statistics */ 248 vdev_stat_ex_t vdev_stat_ex; /* extended statistics */ 249 boolean_t vdev_expanding; /* expand the vdev? */ 250 boolean_t vdev_reopening; /* reopen in progress? */ 251 boolean_t vdev_nonrot; /* true if solid state */ 252 int vdev_load_error; /* error on last load */ 253 int vdev_open_error; /* error on last open */ 254 int vdev_validate_error; /* error on last validate */ 255 kthread_t *vdev_open_thread; /* thread opening children */ 256 kthread_t *vdev_validate_thread; /* thread validating children */ 257 uint64_t vdev_crtxg; /* txg when top-level was added */ 258 uint64_t vdev_root_zap; 259 260 /* 261 * Top-level vdev state. 262 */ 263 uint64_t vdev_ms_array; /* metaslab array object */ 264 uint64_t vdev_ms_shift; /* metaslab size shift */ 265 uint64_t vdev_ms_count; /* number of metaslabs */ 266 metaslab_group_t *vdev_mg; /* metaslab group */ 267 metaslab_group_t *vdev_log_mg; /* embedded slog metaslab group */ 268 metaslab_t **vdev_ms; /* metaslab array */ 269 txg_list_t vdev_ms_list; /* per-txg dirty metaslab lists */ 270 txg_list_t vdev_dtl_list; /* per-txg dirty DTL lists */ 271 txg_node_t vdev_txg_node; /* per-txg dirty vdev linkage */ 272 boolean_t vdev_remove_wanted; /* async remove wanted? */ 273 boolean_t vdev_probe_wanted; /* async probe wanted? */ 274 list_node_t vdev_config_dirty_node; /* config dirty list */ 275 list_node_t vdev_state_dirty_node; /* state dirty list */ 276 uint64_t vdev_deflate_ratio; /* deflation ratio (x512) */ 277 uint64_t vdev_islog; /* is an intent log device */ 278 uint64_t vdev_noalloc; /* device is passivated? */ 279 uint64_t vdev_removing; /* device is being removed? */ 280 uint64_t vdev_failfast; /* device failfast setting */ 281 boolean_t vdev_ishole; /* is a hole in the namespace */ 282 uint64_t vdev_top_zap; 283 vdev_alloc_bias_t vdev_alloc_bias; /* metaslab allocation bias */ 284 285 /* pool checkpoint related */ 286 space_map_t *vdev_checkpoint_sm; /* contains reserved blocks */ 287 288 /* Initialize related */ 289 boolean_t vdev_initialize_exit_wanted; 290 vdev_initializing_state_t vdev_initialize_state; 291 list_node_t vdev_initialize_node; 292 kthread_t *vdev_initialize_thread; 293 /* Protects vdev_initialize_thread and vdev_initialize_state. */ 294 kmutex_t vdev_initialize_lock; 295 kcondvar_t vdev_initialize_cv; 296 uint64_t vdev_initialize_offset[TXG_SIZE]; 297 uint64_t vdev_initialize_last_offset; 298 range_tree_t *vdev_initialize_tree; /* valid while initializing */ 299 uint64_t vdev_initialize_bytes_est; 300 uint64_t vdev_initialize_bytes_done; 301 uint64_t vdev_initialize_action_time; /* start and end time */ 302 303 /* TRIM related */ 304 boolean_t vdev_trim_exit_wanted; 305 boolean_t vdev_autotrim_exit_wanted; 306 vdev_trim_state_t vdev_trim_state; 307 list_node_t vdev_trim_node; 308 kmutex_t vdev_autotrim_lock; 309 kcondvar_t vdev_autotrim_cv; 310 kcondvar_t vdev_autotrim_kick_cv; 311 kthread_t *vdev_autotrim_thread; 312 /* Protects vdev_trim_thread and vdev_trim_state. */ 313 kmutex_t vdev_trim_lock; 314 kcondvar_t vdev_trim_cv; 315 kthread_t *vdev_trim_thread; 316 uint64_t vdev_trim_offset[TXG_SIZE]; 317 uint64_t vdev_trim_last_offset; 318 uint64_t vdev_trim_bytes_est; 319 uint64_t vdev_trim_bytes_done; 320 uint64_t vdev_trim_rate; /* requested rate (bytes/sec) */ 321 uint64_t vdev_trim_partial; /* requested partial TRIM */ 322 uint64_t vdev_trim_secure; /* requested secure TRIM */ 323 uint64_t vdev_trim_action_time; /* start and end time */ 324 325 /* Rebuild related */ 326 boolean_t vdev_rebuilding; 327 boolean_t vdev_rebuild_exit_wanted; 328 boolean_t vdev_rebuild_cancel_wanted; 329 boolean_t vdev_rebuild_reset_wanted; 330 kmutex_t vdev_rebuild_lock; 331 kcondvar_t vdev_rebuild_cv; 332 kthread_t *vdev_rebuild_thread; 333 vdev_rebuild_t vdev_rebuild_config; 334 335 /* For limiting outstanding I/Os (initialize, TRIM) */ 336 kmutex_t vdev_initialize_io_lock; 337 kcondvar_t vdev_initialize_io_cv; 338 uint64_t vdev_initialize_inflight; 339 kmutex_t vdev_trim_io_lock; 340 kcondvar_t vdev_trim_io_cv; 341 uint64_t vdev_trim_inflight[3]; 342 343 /* 344 * Values stored in the config for an indirect or removing vdev. 345 */ 346 vdev_indirect_config_t vdev_indirect_config; 347 348 /* 349 * The vdev_indirect_rwlock protects the vdev_indirect_mapping 350 * pointer from changing on indirect vdevs (when it is condensed). 351 * Note that removing (not yet indirect) vdevs have different 352 * access patterns (the mapping is not accessed from open context, 353 * e.g. from zio_read) and locking strategy (e.g. svr_lock). 354 */ 355 krwlock_t vdev_indirect_rwlock; 356 vdev_indirect_mapping_t *vdev_indirect_mapping; 357 vdev_indirect_births_t *vdev_indirect_births; 358 359 /* 360 * In memory data structures used to manage the obsolete sm, for 361 * indirect or removing vdevs. 362 * 363 * The vdev_obsolete_segments is the in-core record of the segments 364 * that are no longer referenced anywhere in the pool (due to 365 * being freed or remapped and not referenced by any snapshots). 366 * During a sync, segments are added to vdev_obsolete_segments 367 * via vdev_indirect_mark_obsolete(); at the end of each sync 368 * pass, this is appended to vdev_obsolete_sm via 369 * vdev_indirect_sync_obsolete(). The vdev_obsolete_lock 370 * protects against concurrent modifications of vdev_obsolete_segments 371 * from multiple zio threads. 372 */ 373 kmutex_t vdev_obsolete_lock; 374 range_tree_t *vdev_obsolete_segments; 375 space_map_t *vdev_obsolete_sm; 376 377 /* 378 * Protects the vdev_scan_io_queue field itself as well as the 379 * structure's contents (when present). 380 */ 381 kmutex_t vdev_scan_io_queue_lock; 382 struct dsl_scan_io_queue *vdev_scan_io_queue; 383 384 /* 385 * Leaf vdev state. 386 */ 387 range_tree_t *vdev_dtl[DTL_TYPES]; /* dirty time logs */ 388 space_map_t *vdev_dtl_sm; /* dirty time log space map */ 389 txg_node_t vdev_dtl_node; /* per-txg dirty DTL linkage */ 390 uint64_t vdev_dtl_object; /* DTL object */ 391 uint64_t vdev_psize; /* physical device capacity */ 392 uint64_t vdev_wholedisk; /* true if this is a whole disk */ 393 uint64_t vdev_offline; /* persistent offline state */ 394 uint64_t vdev_faulted; /* persistent faulted state */ 395 uint64_t vdev_degraded; /* persistent degraded state */ 396 uint64_t vdev_removed; /* persistent removed state */ 397 uint64_t vdev_resilver_txg; /* persistent resilvering state */ 398 uint64_t vdev_rebuild_txg; /* persistent rebuilding state */ 399 char *vdev_path; /* vdev path (if any) */ 400 char *vdev_devid; /* vdev devid (if any) */ 401 char *vdev_physpath; /* vdev device path (if any) */ 402 char *vdev_enc_sysfs_path; /* enclosure sysfs path */ 403 char *vdev_fru; /* physical FRU location */ 404 uint64_t vdev_not_present; /* not present during import */ 405 uint64_t vdev_unspare; /* unspare when resilvering done */ 406 boolean_t vdev_nowritecache; /* true if flushwritecache failed */ 407 boolean_t vdev_has_trim; /* TRIM is supported */ 408 boolean_t vdev_has_securetrim; /* secure TRIM is supported */ 409 boolean_t vdev_checkremove; /* temporary online test */ 410 boolean_t vdev_forcefault; /* force online fault */ 411 boolean_t vdev_splitting; /* split or repair in progress */ 412 boolean_t vdev_delayed_close; /* delayed device close? */ 413 boolean_t vdev_tmpoffline; /* device taken offline temporarily? */ 414 boolean_t vdev_detached; /* device detached? */ 415 boolean_t vdev_cant_read; /* vdev is failing all reads */ 416 boolean_t vdev_cant_write; /* vdev is failing all writes */ 417 boolean_t vdev_isspare; /* was a hot spare */ 418 boolean_t vdev_isl2cache; /* was a l2cache device */ 419 boolean_t vdev_copy_uberblocks; /* post expand copy uberblocks */ 420 boolean_t vdev_resilver_deferred; /* resilver deferred */ 421 boolean_t vdev_kobj_flag; /* kobj event record */ 422 boolean_t vdev_attaching; /* vdev attach ashift handling */ 423 vdev_queue_t vdev_queue; /* I/O deadline schedule queue */ 424 spa_aux_vdev_t *vdev_aux; /* for l2cache and spares vdevs */ 425 zio_t *vdev_probe_zio; /* root of current probe */ 426 vdev_aux_t vdev_label_aux; /* on-disk aux state */ 427 uint64_t vdev_leaf_zap; 428 hrtime_t vdev_mmp_pending; /* 0 if write finished */ 429 uint64_t vdev_mmp_kstat_id; /* to find kstat entry */ 430 uint64_t vdev_expansion_time; /* vdev's last expansion time */ 431 list_node_t vdev_leaf_node; /* leaf vdev list */ 432 433 /* 434 * For DTrace to work in userland (libzpool) context, these fields must 435 * remain at the end of the structure. DTrace will use the kernel's 436 * CTF definition for 'struct vdev', and since the size of a kmutex_t is 437 * larger in userland, the offsets for the rest of the fields would be 438 * incorrect. 439 */ 440 kmutex_t vdev_dtl_lock; /* vdev_dtl_{map,resilver} */ 441 kmutex_t vdev_stat_lock; /* vdev_stat */ 442 kmutex_t vdev_probe_lock; /* protects vdev_probe_zio */ 443 444 /* 445 * We rate limit ZIO delay, deadman, and checksum events, since they 446 * can flood ZED with tons of events when a drive is acting up. 447 */ 448 zfs_ratelimit_t vdev_delay_rl; 449 zfs_ratelimit_t vdev_deadman_rl; 450 zfs_ratelimit_t vdev_checksum_rl; 451 452 /* 453 * Checksum and IO thresholds for tuning ZED 454 */ 455 uint64_t vdev_checksum_n; 456 uint64_t vdev_checksum_t; 457 uint64_t vdev_io_n; 458 uint64_t vdev_io_t; 459 }; 460 461 #define VDEV_PAD_SIZE (8 << 10) 462 /* 2 padding areas (vl_pad1 and vl_be) to skip */ 463 #define VDEV_SKIP_SIZE VDEV_PAD_SIZE * 2 464 #define VDEV_PHYS_SIZE (112 << 10) 465 #define VDEV_UBERBLOCK_RING (128 << 10) 466 467 /* 468 * MMP blocks occupy the last MMP_BLOCKS_PER_LABEL slots in the uberblock 469 * ring when MMP is enabled. 470 */ 471 #define MMP_BLOCKS_PER_LABEL 1 472 473 /* The largest uberblock we support is 8k. */ 474 #define MAX_UBERBLOCK_SHIFT (13) 475 #define VDEV_UBERBLOCK_SHIFT(vd) \ 476 MIN(MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT), \ 477 MAX_UBERBLOCK_SHIFT) 478 #define VDEV_UBERBLOCK_COUNT(vd) \ 479 (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd)) 480 #define VDEV_UBERBLOCK_OFFSET(vd, n) \ 481 offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)]) 482 #define VDEV_UBERBLOCK_SIZE(vd) (1ULL << VDEV_UBERBLOCK_SHIFT(vd)) 483 484 typedef struct vdev_phys { 485 char vp_nvlist[VDEV_PHYS_SIZE - sizeof (zio_eck_t)]; 486 zio_eck_t vp_zbt; 487 } vdev_phys_t; 488 489 typedef enum vbe_vers { 490 /* 491 * The bootenv file is stored as ascii text in the envblock. 492 * It is used by the GRUB bootloader used on Linux to store the 493 * contents of the grubenv file. The file is stored as raw ASCII, 494 * and is protected by an embedded checksum. By default, GRUB will 495 * check if the boot filesystem supports storing the environment data 496 * in a special location, and if so, will invoke filesystem specific 497 * logic to retrieve it. This can be overridden by a variable, should 498 * the user so desire. 499 */ 500 VB_RAW = 0, 501 502 /* 503 * The bootenv file is converted to an nvlist and then packed into the 504 * envblock. 505 */ 506 VB_NVLIST = 1 507 } vbe_vers_t; 508 509 typedef struct vdev_boot_envblock { 510 uint64_t vbe_version; 511 char vbe_bootenv[VDEV_PAD_SIZE - sizeof (uint64_t) - 512 sizeof (zio_eck_t)]; 513 zio_eck_t vbe_zbt; 514 } vdev_boot_envblock_t; 515 _Static_assert(sizeof (vdev_boot_envblock_t) == VDEV_PAD_SIZE, 516 "vdev_boot_envblock_t wrong size"); 517 518 typedef struct vdev_label { 519 char vl_pad1[VDEV_PAD_SIZE]; /* 8K */ 520 vdev_boot_envblock_t vl_be; /* 8K */ 521 vdev_phys_t vl_vdev_phys; /* 112K */ 522 char vl_uberblock[VDEV_UBERBLOCK_RING]; /* 128K */ 523 } vdev_label_t; /* 256K total */ 524 525 /* 526 * vdev_dirty() flags 527 */ 528 #define VDD_METASLAB 0x01 529 #define VDD_DTL 0x02 530 531 /* Offset of embedded boot loader region on each label */ 532 #define VDEV_BOOT_OFFSET (2 * sizeof (vdev_label_t)) 533 /* 534 * Size of embedded boot loader region on each label. 535 * The total size of the first two labels plus the boot area is 4MB. 536 */ 537 #define VDEV_BOOT_SIZE (7ULL << 19) /* 3.5M */ 538 539 /* 540 * Size of label regions at the start and end of each leaf device. 541 */ 542 #define VDEV_LABEL_START_SIZE (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE) 543 #define VDEV_LABEL_END_SIZE (2 * sizeof (vdev_label_t)) 544 #define VDEV_LABELS 4 545 #define VDEV_BEST_LABEL VDEV_LABELS 546 #define VDEV_OFFSET_IS_LABEL(vd, off) \ 547 (((off) < VDEV_LABEL_START_SIZE) || \ 548 ((off) >= ((vd)->vdev_psize - VDEV_LABEL_END_SIZE))) 549 550 #define VDEV_ALLOC_LOAD 0 551 #define VDEV_ALLOC_ADD 1 552 #define VDEV_ALLOC_SPARE 2 553 #define VDEV_ALLOC_L2CACHE 3 554 #define VDEV_ALLOC_ROOTPOOL 4 555 #define VDEV_ALLOC_SPLIT 5 556 #define VDEV_ALLOC_ATTACH 6 557 558 /* 559 * Allocate or free a vdev 560 */ 561 extern vdev_t *vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid, 562 vdev_ops_t *ops); 563 extern int vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *config, 564 vdev_t *parent, uint_t id, int alloctype); 565 extern void vdev_free(vdev_t *vd); 566 567 /* 568 * Add or remove children and parents 569 */ 570 extern void vdev_add_child(vdev_t *pvd, vdev_t *cvd); 571 extern void vdev_remove_child(vdev_t *pvd, vdev_t *cvd); 572 extern void vdev_compact_children(vdev_t *pvd); 573 extern vdev_t *vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops); 574 extern void vdev_remove_parent(vdev_t *cvd); 575 576 /* 577 * vdev sync load and sync 578 */ 579 extern boolean_t vdev_log_state_valid(vdev_t *vd); 580 extern int vdev_load(vdev_t *vd); 581 extern int vdev_dtl_load(vdev_t *vd); 582 extern void vdev_sync(vdev_t *vd, uint64_t txg); 583 extern void vdev_sync_done(vdev_t *vd, uint64_t txg); 584 extern void vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg); 585 extern void vdev_dirty_leaves(vdev_t *vd, int flags, uint64_t txg); 586 587 /* 588 * Available vdev types. 589 */ 590 extern vdev_ops_t vdev_root_ops; 591 extern vdev_ops_t vdev_mirror_ops; 592 extern vdev_ops_t vdev_replacing_ops; 593 extern vdev_ops_t vdev_raidz_ops; 594 extern vdev_ops_t vdev_draid_ops; 595 extern vdev_ops_t vdev_draid_spare_ops; 596 extern vdev_ops_t vdev_disk_ops; 597 extern vdev_ops_t vdev_file_ops; 598 extern vdev_ops_t vdev_missing_ops; 599 extern vdev_ops_t vdev_hole_ops; 600 extern vdev_ops_t vdev_spare_ops; 601 extern vdev_ops_t vdev_indirect_ops; 602 603 /* 604 * Common size functions 605 */ 606 extern void vdev_default_xlate(vdev_t *vd, const range_seg64_t *logical_rs, 607 range_seg64_t *physical_rs, range_seg64_t *remain_rs); 608 extern uint64_t vdev_default_asize(vdev_t *vd, uint64_t psize); 609 extern uint64_t vdev_default_min_asize(vdev_t *vd); 610 extern uint64_t vdev_get_min_asize(vdev_t *vd); 611 extern void vdev_set_min_asize(vdev_t *vd); 612 extern uint64_t vdev_get_min_alloc(vdev_t *vd); 613 extern uint64_t vdev_get_nparity(vdev_t *vd); 614 extern uint64_t vdev_get_ndisks(vdev_t *vd); 615 616 /* 617 * Global variables 618 */ 619 extern int zfs_vdev_standard_sm_blksz; 620 621 /* 622 * Functions from vdev_indirect.c 623 */ 624 extern void vdev_indirect_sync_obsolete(vdev_t *vd, dmu_tx_t *tx); 625 extern boolean_t vdev_indirect_should_condense(vdev_t *vd); 626 extern void spa_condense_indirect_start_sync(vdev_t *vd, dmu_tx_t *tx); 627 extern int vdev_obsolete_sm_object(vdev_t *vd, uint64_t *sm_obj); 628 extern int vdev_obsolete_counts_are_precise(vdev_t *vd, boolean_t *are_precise); 629 630 /* 631 * Other miscellaneous functions 632 */ 633 int vdev_checkpoint_sm_object(vdev_t *vd, uint64_t *sm_obj); 634 void vdev_metaslab_group_create(vdev_t *vd); 635 uint64_t vdev_best_ashift(uint64_t logical, uint64_t a, uint64_t b); 636 637 /* 638 * Vdev ashift optimization tunables 639 */ 640 extern uint_t zfs_vdev_min_auto_ashift; 641 extern uint_t zfs_vdev_max_auto_ashift; 642 int param_set_min_auto_ashift(ZFS_MODULE_PARAM_ARGS); 643 int param_set_max_auto_ashift(ZFS_MODULE_PARAM_ARGS); 644 645 #ifdef __cplusplus 646 } 647 #endif 648 649 #endif /* _SYS_VDEV_IMPL_H */ 650