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, 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 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_init_func_t(spa_t *spa, nvlist_t *nv, void **tsd); 72 typedef void vdev_fini_func_t(vdev_t *vd); 73 typedef int vdev_open_func_t(vdev_t *vd, uint64_t *size, uint64_t *max_size, 74 uint64_t *ashift, uint64_t *pshift); 75 typedef void vdev_close_func_t(vdev_t *vd); 76 typedef uint64_t vdev_asize_func_t(vdev_t *vd, uint64_t psize); 77 typedef uint64_t vdev_min_asize_func_t(vdev_t *vd); 78 typedef uint64_t vdev_min_alloc_func_t(vdev_t *vd); 79 typedef void vdev_io_start_func_t(zio_t *zio); 80 typedef void vdev_io_done_func_t(zio_t *zio); 81 typedef void vdev_state_change_func_t(vdev_t *vd, int, int); 82 typedef boolean_t vdev_need_resilver_func_t(vdev_t *vd, const dva_t *dva, 83 size_t psize, uint64_t phys_birth); 84 typedef void vdev_hold_func_t(vdev_t *vd); 85 typedef void vdev_rele_func_t(vdev_t *vd); 86 87 typedef void vdev_remap_cb_t(uint64_t inner_offset, vdev_t *vd, 88 uint64_t offset, uint64_t size, void *arg); 89 typedef void vdev_remap_func_t(vdev_t *vd, uint64_t offset, uint64_t size, 90 vdev_remap_cb_t callback, void *arg); 91 /* 92 * Given a target vdev, translates the logical range "in" to the physical 93 * range "res" 94 */ 95 typedef void vdev_xlation_func_t(vdev_t *cvd, const range_seg64_t *logical, 96 range_seg64_t *physical, range_seg64_t *remain); 97 typedef uint64_t vdev_rebuild_asize_func_t(vdev_t *vd, uint64_t start, 98 uint64_t size, uint64_t max_segment); 99 typedef void vdev_metaslab_init_func_t(vdev_t *vd, uint64_t *startp, 100 uint64_t *sizep); 101 typedef void vdev_config_generate_func_t(vdev_t *vd, nvlist_t *nv); 102 typedef uint64_t vdev_nparity_func_t(vdev_t *vd); 103 typedef uint64_t vdev_ndisks_func_t(vdev_t *vd); 104 105 typedef const struct vdev_ops { 106 vdev_init_func_t *vdev_op_init; 107 vdev_fini_func_t *vdev_op_fini; 108 vdev_open_func_t *vdev_op_open; 109 vdev_close_func_t *vdev_op_close; 110 vdev_asize_func_t *vdev_op_asize; 111 vdev_min_asize_func_t *vdev_op_min_asize; 112 vdev_min_alloc_func_t *vdev_op_min_alloc; 113 vdev_io_start_func_t *vdev_op_io_start; 114 vdev_io_done_func_t *vdev_op_io_done; 115 vdev_state_change_func_t *vdev_op_state_change; 116 vdev_need_resilver_func_t *vdev_op_need_resilver; 117 vdev_hold_func_t *vdev_op_hold; 118 vdev_rele_func_t *vdev_op_rele; 119 vdev_remap_func_t *vdev_op_remap; 120 vdev_xlation_func_t *vdev_op_xlate; 121 vdev_rebuild_asize_func_t *vdev_op_rebuild_asize; 122 vdev_metaslab_init_func_t *vdev_op_metaslab_init; 123 vdev_config_generate_func_t *vdev_op_config_generate; 124 vdev_nparity_func_t *vdev_op_nparity; 125 vdev_ndisks_func_t *vdev_op_ndisks; 126 char vdev_op_type[16]; 127 boolean_t vdev_op_leaf; 128 } vdev_ops_t; 129 130 /* 131 * Virtual device properties 132 */ 133 struct vdev_cache_entry { 134 struct abd *ve_abd; 135 uint64_t ve_offset; 136 clock_t ve_lastused; 137 avl_node_t ve_offset_node; 138 avl_node_t ve_lastused_node; 139 uint32_t ve_hits; 140 uint16_t ve_missed_update; 141 zio_t *ve_fill_io; 142 }; 143 144 struct vdev_cache { 145 avl_tree_t vc_offset_tree; 146 avl_tree_t vc_lastused_tree; 147 kmutex_t vc_lock; 148 }; 149 150 typedef struct vdev_queue_class { 151 uint32_t vqc_active; 152 153 /* 154 * Sorted by offset or timestamp, depending on if the queue is 155 * LBA-ordered vs FIFO. 156 */ 157 avl_tree_t vqc_queued_tree; 158 } vdev_queue_class_t; 159 160 struct vdev_queue { 161 vdev_t *vq_vdev; 162 vdev_queue_class_t vq_class[ZIO_PRIORITY_NUM_QUEUEABLE]; 163 avl_tree_t vq_active_tree; 164 avl_tree_t vq_read_offset_tree; 165 avl_tree_t vq_write_offset_tree; 166 avl_tree_t vq_trim_offset_tree; 167 uint64_t vq_last_offset; 168 zio_priority_t vq_last_prio; /* Last sent I/O priority. */ 169 uint32_t vq_ia_active; /* Active interactive I/Os. */ 170 uint32_t vq_nia_credit; /* Non-interactive I/Os credit. */ 171 hrtime_t vq_io_complete_ts; /* time last i/o completed */ 172 hrtime_t vq_io_delta_ts; 173 zio_t vq_io_search; /* used as local for stack reduction */ 174 kmutex_t vq_lock; 175 }; 176 177 typedef enum vdev_alloc_bias { 178 VDEV_BIAS_NONE, 179 VDEV_BIAS_LOG, /* dedicated to ZIL data (SLOG) */ 180 VDEV_BIAS_SPECIAL, /* dedicated to ddt, metadata, and small blks */ 181 VDEV_BIAS_DEDUP /* dedicated to dedup metadata */ 182 } vdev_alloc_bias_t; 183 184 185 /* 186 * On-disk indirect vdev state. 187 * 188 * An indirect vdev is described exclusively in the MOS config of a pool. 189 * The config for an indirect vdev includes several fields, which are 190 * accessed in memory by a vdev_indirect_config_t. 191 */ 192 typedef struct vdev_indirect_config { 193 /* 194 * Object (in MOS) which contains the indirect mapping. This object 195 * contains an array of vdev_indirect_mapping_entry_phys_t ordered by 196 * vimep_src. The bonus buffer for this object is a 197 * vdev_indirect_mapping_phys_t. This object is allocated when a vdev 198 * removal is initiated. 199 * 200 * Note that this object can be empty if none of the data on the vdev 201 * has been copied yet. 202 */ 203 uint64_t vic_mapping_object; 204 205 /* 206 * Object (in MOS) which contains the birth times for the mapping 207 * entries. This object contains an array of 208 * vdev_indirect_birth_entry_phys_t sorted by vibe_offset. The bonus 209 * buffer for this object is a vdev_indirect_birth_phys_t. This object 210 * is allocated when a vdev removal is initiated. 211 * 212 * Note that this object can be empty if none of the vdev has yet been 213 * copied. 214 */ 215 uint64_t vic_births_object; 216 217 /* 218 * This is the vdev ID which was removed previous to this vdev, or 219 * UINT64_MAX if there are no previously removed vdevs. 220 */ 221 uint64_t vic_prev_indirect_vdev; 222 } vdev_indirect_config_t; 223 224 /* 225 * Virtual device descriptor 226 */ 227 struct vdev { 228 /* 229 * Common to all vdev types. 230 */ 231 uint64_t vdev_id; /* child number in vdev parent */ 232 uint64_t vdev_guid; /* unique ID for this vdev */ 233 uint64_t vdev_guid_sum; /* self guid + all child guids */ 234 uint64_t vdev_orig_guid; /* orig. guid prior to remove */ 235 uint64_t vdev_asize; /* allocatable device capacity */ 236 uint64_t vdev_min_asize; /* min acceptable asize */ 237 uint64_t vdev_max_asize; /* max acceptable asize */ 238 uint64_t vdev_ashift; /* block alignment shift */ 239 240 /* 241 * Logical block alignment shift 242 * 243 * The smallest sized/aligned I/O supported by the device. 244 */ 245 uint64_t vdev_logical_ashift; 246 /* 247 * Physical block alignment shift 248 * 249 * The device supports logical I/Os with vdev_logical_ashift 250 * size/alignment, but optimum performance will be achieved by 251 * aligning/sizing requests to vdev_physical_ashift. Smaller 252 * requests may be inflated or incur device level read-modify-write 253 * operations. 254 * 255 * May be 0 to indicate no preference (i.e. use vdev_logical_ashift). 256 */ 257 uint64_t vdev_physical_ashift; 258 uint64_t vdev_state; /* see VDEV_STATE_* #defines */ 259 uint64_t vdev_prevstate; /* used when reopening a vdev */ 260 vdev_ops_t *vdev_ops; /* vdev operations */ 261 spa_t *vdev_spa; /* spa for this vdev */ 262 void *vdev_tsd; /* type-specific data */ 263 vdev_t *vdev_top; /* top-level vdev */ 264 vdev_t *vdev_parent; /* parent vdev */ 265 vdev_t **vdev_child; /* array of children */ 266 uint64_t vdev_children; /* number of children */ 267 vdev_stat_t vdev_stat; /* virtual device statistics */ 268 vdev_stat_ex_t vdev_stat_ex; /* extended statistics */ 269 boolean_t vdev_expanding; /* expand the vdev? */ 270 boolean_t vdev_reopening; /* reopen in progress? */ 271 boolean_t vdev_nonrot; /* true if solid state */ 272 int vdev_open_error; /* error on last open */ 273 kthread_t *vdev_open_thread; /* thread opening children */ 274 uint64_t vdev_crtxg; /* txg when top-level was added */ 275 276 /* 277 * Top-level vdev state. 278 */ 279 uint64_t vdev_ms_array; /* metaslab array object */ 280 uint64_t vdev_ms_shift; /* metaslab size shift */ 281 uint64_t vdev_ms_count; /* number of metaslabs */ 282 metaslab_group_t *vdev_mg; /* metaslab group */ 283 metaslab_t **vdev_ms; /* metaslab array */ 284 uint64_t vdev_pending_fastwrite; /* allocated fastwrites */ 285 txg_list_t vdev_ms_list; /* per-txg dirty metaslab lists */ 286 txg_list_t vdev_dtl_list; /* per-txg dirty DTL lists */ 287 txg_node_t vdev_txg_node; /* per-txg dirty vdev linkage */ 288 boolean_t vdev_remove_wanted; /* async remove wanted? */ 289 boolean_t vdev_probe_wanted; /* async probe wanted? */ 290 list_node_t vdev_config_dirty_node; /* config dirty list */ 291 list_node_t vdev_state_dirty_node; /* state dirty list */ 292 uint64_t vdev_deflate_ratio; /* deflation ratio (x512) */ 293 uint64_t vdev_islog; /* is an intent log device */ 294 uint64_t vdev_removing; /* device is being removed? */ 295 boolean_t vdev_ishole; /* is a hole in the namespace */ 296 uint64_t vdev_top_zap; 297 vdev_alloc_bias_t vdev_alloc_bias; /* metaslab allocation bias */ 298 299 /* pool checkpoint related */ 300 space_map_t *vdev_checkpoint_sm; /* contains reserved blocks */ 301 302 /* Initialize related */ 303 boolean_t vdev_initialize_exit_wanted; 304 vdev_initializing_state_t vdev_initialize_state; 305 list_node_t vdev_initialize_node; 306 kthread_t *vdev_initialize_thread; 307 /* Protects vdev_initialize_thread and vdev_initialize_state. */ 308 kmutex_t vdev_initialize_lock; 309 kcondvar_t vdev_initialize_cv; 310 uint64_t vdev_initialize_offset[TXG_SIZE]; 311 uint64_t vdev_initialize_last_offset; 312 range_tree_t *vdev_initialize_tree; /* valid while initializing */ 313 uint64_t vdev_initialize_bytes_est; 314 uint64_t vdev_initialize_bytes_done; 315 uint64_t vdev_initialize_action_time; /* start and end time */ 316 317 /* TRIM related */ 318 boolean_t vdev_trim_exit_wanted; 319 boolean_t vdev_autotrim_exit_wanted; 320 vdev_trim_state_t vdev_trim_state; 321 list_node_t vdev_trim_node; 322 kmutex_t vdev_autotrim_lock; 323 kcondvar_t vdev_autotrim_cv; 324 kthread_t *vdev_autotrim_thread; 325 /* Protects vdev_trim_thread and vdev_trim_state. */ 326 kmutex_t vdev_trim_lock; 327 kcondvar_t vdev_trim_cv; 328 kthread_t *vdev_trim_thread; 329 uint64_t vdev_trim_offset[TXG_SIZE]; 330 uint64_t vdev_trim_last_offset; 331 uint64_t vdev_trim_bytes_est; 332 uint64_t vdev_trim_bytes_done; 333 uint64_t vdev_trim_rate; /* requested rate (bytes/sec) */ 334 uint64_t vdev_trim_partial; /* requested partial TRIM */ 335 uint64_t vdev_trim_secure; /* requested secure TRIM */ 336 uint64_t vdev_trim_action_time; /* start and end time */ 337 338 /* Rebuild related */ 339 boolean_t vdev_rebuilding; 340 boolean_t vdev_rebuild_exit_wanted; 341 boolean_t vdev_rebuild_cancel_wanted; 342 boolean_t vdev_rebuild_reset_wanted; 343 kmutex_t vdev_rebuild_lock; 344 kcondvar_t vdev_rebuild_cv; 345 kthread_t *vdev_rebuild_thread; 346 vdev_rebuild_t vdev_rebuild_config; 347 348 /* For limiting outstanding I/Os (initialize, TRIM) */ 349 kmutex_t vdev_initialize_io_lock; 350 kcondvar_t vdev_initialize_io_cv; 351 uint64_t vdev_initialize_inflight; 352 kmutex_t vdev_trim_io_lock; 353 kcondvar_t vdev_trim_io_cv; 354 uint64_t vdev_trim_inflight[3]; 355 356 /* 357 * Values stored in the config for an indirect or removing vdev. 358 */ 359 vdev_indirect_config_t vdev_indirect_config; 360 361 /* 362 * The vdev_indirect_rwlock protects the vdev_indirect_mapping 363 * pointer from changing on indirect vdevs (when it is condensed). 364 * Note that removing (not yet indirect) vdevs have different 365 * access patterns (the mapping is not accessed from open context, 366 * e.g. from zio_read) and locking strategy (e.g. svr_lock). 367 */ 368 krwlock_t vdev_indirect_rwlock; 369 vdev_indirect_mapping_t *vdev_indirect_mapping; 370 vdev_indirect_births_t *vdev_indirect_births; 371 372 /* 373 * In memory data structures used to manage the obsolete sm, for 374 * indirect or removing vdevs. 375 * 376 * The vdev_obsolete_segments is the in-core record of the segments 377 * that are no longer referenced anywhere in the pool (due to 378 * being freed or remapped and not referenced by any snapshots). 379 * During a sync, segments are added to vdev_obsolete_segments 380 * via vdev_indirect_mark_obsolete(); at the end of each sync 381 * pass, this is appended to vdev_obsolete_sm via 382 * vdev_indirect_sync_obsolete(). The vdev_obsolete_lock 383 * protects against concurrent modifications of vdev_obsolete_segments 384 * from multiple zio threads. 385 */ 386 kmutex_t vdev_obsolete_lock; 387 range_tree_t *vdev_obsolete_segments; 388 space_map_t *vdev_obsolete_sm; 389 390 /* 391 * Protects the vdev_scan_io_queue field itself as well as the 392 * structure's contents (when present). 393 */ 394 kmutex_t vdev_scan_io_queue_lock; 395 struct dsl_scan_io_queue *vdev_scan_io_queue; 396 397 /* 398 * Leaf vdev state. 399 */ 400 range_tree_t *vdev_dtl[DTL_TYPES]; /* dirty time logs */ 401 space_map_t *vdev_dtl_sm; /* dirty time log space map */ 402 txg_node_t vdev_dtl_node; /* per-txg dirty DTL linkage */ 403 uint64_t vdev_dtl_object; /* DTL object */ 404 uint64_t vdev_psize; /* physical device capacity */ 405 uint64_t vdev_wholedisk; /* true if this is a whole disk */ 406 uint64_t vdev_offline; /* persistent offline state */ 407 uint64_t vdev_faulted; /* persistent faulted state */ 408 uint64_t vdev_degraded; /* persistent degraded state */ 409 uint64_t vdev_removed; /* persistent removed state */ 410 uint64_t vdev_resilver_txg; /* persistent resilvering state */ 411 uint64_t vdev_rebuild_txg; /* persistent rebuilding state */ 412 char *vdev_path; /* vdev path (if any) */ 413 char *vdev_devid; /* vdev devid (if any) */ 414 char *vdev_physpath; /* vdev device path (if any) */ 415 char *vdev_enc_sysfs_path; /* enclosure sysfs path */ 416 char *vdev_fru; /* physical FRU location */ 417 uint64_t vdev_not_present; /* not present during import */ 418 uint64_t vdev_unspare; /* unspare when resilvering done */ 419 boolean_t vdev_nowritecache; /* true if flushwritecache failed */ 420 boolean_t vdev_has_trim; /* TRIM is supported */ 421 boolean_t vdev_has_securetrim; /* secure TRIM is supported */ 422 boolean_t vdev_checkremove; /* temporary online test */ 423 boolean_t vdev_forcefault; /* force online fault */ 424 boolean_t vdev_splitting; /* split or repair in progress */ 425 boolean_t vdev_delayed_close; /* delayed device close? */ 426 boolean_t vdev_tmpoffline; /* device taken offline temporarily? */ 427 boolean_t vdev_detached; /* device detached? */ 428 boolean_t vdev_cant_read; /* vdev is failing all reads */ 429 boolean_t vdev_cant_write; /* vdev is failing all writes */ 430 boolean_t vdev_isspare; /* was a hot spare */ 431 boolean_t vdev_isl2cache; /* was a l2cache device */ 432 boolean_t vdev_copy_uberblocks; /* post expand copy uberblocks */ 433 boolean_t vdev_resilver_deferred; /* resilver deferred */ 434 vdev_queue_t vdev_queue; /* I/O deadline schedule queue */ 435 vdev_cache_t vdev_cache; /* physical block cache */ 436 spa_aux_vdev_t *vdev_aux; /* for l2cache and spares vdevs */ 437 zio_t *vdev_probe_zio; /* root of current probe */ 438 vdev_aux_t vdev_label_aux; /* on-disk aux state */ 439 uint64_t vdev_leaf_zap; 440 hrtime_t vdev_mmp_pending; /* 0 if write finished */ 441 uint64_t vdev_mmp_kstat_id; /* to find kstat entry */ 442 uint64_t vdev_expansion_time; /* vdev's last expansion time */ 443 list_node_t vdev_leaf_node; /* leaf vdev list */ 444 445 /* 446 * For DTrace to work in userland (libzpool) context, these fields must 447 * remain at the end of the structure. DTrace will use the kernel's 448 * CTF definition for 'struct vdev', and since the size of a kmutex_t is 449 * larger in userland, the offsets for the rest of the fields would be 450 * incorrect. 451 */ 452 kmutex_t vdev_dtl_lock; /* vdev_dtl_{map,resilver} */ 453 kmutex_t vdev_stat_lock; /* vdev_stat */ 454 kmutex_t vdev_probe_lock; /* protects vdev_probe_zio */ 455 456 /* 457 * We rate limit ZIO delay and ZIO checksum events, since they 458 * can flood ZED with tons of events when a drive is acting up. 459 */ 460 zfs_ratelimit_t vdev_delay_rl; 461 zfs_ratelimit_t vdev_checksum_rl; 462 }; 463 464 #define VDEV_PAD_SIZE (8 << 10) 465 /* 2 padding areas (vl_pad1 and vl_be) to skip */ 466 #define VDEV_SKIP_SIZE VDEV_PAD_SIZE * 2 467 #define VDEV_PHYS_SIZE (112 << 10) 468 #define VDEV_UBERBLOCK_RING (128 << 10) 469 470 /* 471 * MMP blocks occupy the last MMP_BLOCKS_PER_LABEL slots in the uberblock 472 * ring when MMP is enabled. 473 */ 474 #define MMP_BLOCKS_PER_LABEL 1 475 476 /* The largest uberblock we support is 8k. */ 477 #define MAX_UBERBLOCK_SHIFT (13) 478 #define VDEV_UBERBLOCK_SHIFT(vd) \ 479 MIN(MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT), \ 480 MAX_UBERBLOCK_SHIFT) 481 #define VDEV_UBERBLOCK_COUNT(vd) \ 482 (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd)) 483 #define VDEV_UBERBLOCK_OFFSET(vd, n) \ 484 offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)]) 485 #define VDEV_UBERBLOCK_SIZE(vd) (1ULL << VDEV_UBERBLOCK_SHIFT(vd)) 486 487 typedef struct vdev_phys { 488 char vp_nvlist[VDEV_PHYS_SIZE - sizeof (zio_eck_t)]; 489 zio_eck_t vp_zbt; 490 } vdev_phys_t; 491 492 typedef enum vbe_vers { 493 /* 494 * The bootenv file is stored as ascii text in the envblock. 495 * It is used by the GRUB bootloader used on Linux to store the 496 * contents of the grubenv file. The file is stored as raw ASCII, 497 * and is protected by an embedded checksum. By default, GRUB will 498 * check if the boot filesystem supports storing the environment data 499 * in a special location, and if so, will invoke filesystem specific 500 * logic to retrieve it. This can be overriden by a variable, should 501 * the user so desire. 502 */ 503 VB_RAW = 0, 504 505 /* 506 * The bootenv file is converted to an nvlist and then packed into the 507 * envblock. 508 */ 509 VB_NVLIST = 1 510 } vbe_vers_t; 511 512 typedef struct vdev_boot_envblock { 513 uint64_t vbe_version; 514 char vbe_bootenv[VDEV_PAD_SIZE - sizeof (uint64_t) - 515 sizeof (zio_eck_t)]; 516 zio_eck_t vbe_zbt; 517 } vdev_boot_envblock_t; 518 519 CTASSERT_GLOBAL(sizeof (vdev_boot_envblock_t) == VDEV_PAD_SIZE); 520 521 typedef struct vdev_label { 522 char vl_pad1[VDEV_PAD_SIZE]; /* 8K */ 523 vdev_boot_envblock_t vl_be; /* 8K */ 524 vdev_phys_t vl_vdev_phys; /* 112K */ 525 char vl_uberblock[VDEV_UBERBLOCK_RING]; /* 128K */ 526 } vdev_label_t; /* 256K total */ 527 528 /* 529 * vdev_dirty() flags 530 */ 531 #define VDD_METASLAB 0x01 532 #define VDD_DTL 0x02 533 534 /* Offset of embedded boot loader region on each label */ 535 #define VDEV_BOOT_OFFSET (2 * sizeof (vdev_label_t)) 536 /* 537 * Size of embedded boot loader region on each label. 538 * The total size of the first two labels plus the boot area is 4MB. 539 */ 540 #define VDEV_BOOT_SIZE (7ULL << 19) /* 3.5M */ 541 542 /* 543 * Size of label regions at the start and end of each leaf device. 544 */ 545 #define VDEV_LABEL_START_SIZE (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE) 546 #define VDEV_LABEL_END_SIZE (2 * sizeof (vdev_label_t)) 547 #define VDEV_LABELS 4 548 #define VDEV_BEST_LABEL VDEV_LABELS 549 #define VDEV_OFFSET_IS_LABEL(vd, off) \ 550 (((off) < VDEV_LABEL_START_SIZE) || \ 551 ((off) >= ((vd)->vdev_psize - VDEV_LABEL_END_SIZE))) 552 553 #define VDEV_ALLOC_LOAD 0 554 #define VDEV_ALLOC_ADD 1 555 #define VDEV_ALLOC_SPARE 2 556 #define VDEV_ALLOC_L2CACHE 3 557 #define VDEV_ALLOC_ROOTPOOL 4 558 #define VDEV_ALLOC_SPLIT 5 559 #define VDEV_ALLOC_ATTACH 6 560 561 /* 562 * Allocate or free a vdev 563 */ 564 extern vdev_t *vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid, 565 vdev_ops_t *ops); 566 extern int vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *config, 567 vdev_t *parent, uint_t id, int alloctype); 568 extern void vdev_free(vdev_t *vd); 569 570 /* 571 * Add or remove children and parents 572 */ 573 extern void vdev_add_child(vdev_t *pvd, vdev_t *cvd); 574 extern void vdev_remove_child(vdev_t *pvd, vdev_t *cvd); 575 extern void vdev_compact_children(vdev_t *pvd); 576 extern vdev_t *vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops); 577 extern void vdev_remove_parent(vdev_t *cvd); 578 579 /* 580 * vdev sync load and sync 581 */ 582 extern boolean_t vdev_log_state_valid(vdev_t *vd); 583 extern int vdev_load(vdev_t *vd); 584 extern int vdev_dtl_load(vdev_t *vd); 585 extern void vdev_sync(vdev_t *vd, uint64_t txg); 586 extern void vdev_sync_done(vdev_t *vd, uint64_t txg); 587 extern void vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg); 588 extern void vdev_dirty_leaves(vdev_t *vd, int flags, uint64_t txg); 589 590 /* 591 * Available vdev types. 592 */ 593 extern vdev_ops_t vdev_root_ops; 594 extern vdev_ops_t vdev_mirror_ops; 595 extern vdev_ops_t vdev_replacing_ops; 596 extern vdev_ops_t vdev_raidz_ops; 597 extern vdev_ops_t vdev_draid_ops; 598 extern vdev_ops_t vdev_draid_spare_ops; 599 extern vdev_ops_t vdev_disk_ops; 600 extern vdev_ops_t vdev_file_ops; 601 extern vdev_ops_t vdev_missing_ops; 602 extern vdev_ops_t vdev_hole_ops; 603 extern vdev_ops_t vdev_spare_ops; 604 extern vdev_ops_t vdev_indirect_ops; 605 606 /* 607 * Common size functions 608 */ 609 extern void vdev_default_xlate(vdev_t *vd, const range_seg64_t *logical_rs, 610 range_seg64_t *physical_rs, range_seg64_t *remain_rs); 611 extern uint64_t vdev_default_asize(vdev_t *vd, uint64_t psize); 612 extern uint64_t vdev_default_min_asize(vdev_t *vd); 613 extern uint64_t vdev_get_min_asize(vdev_t *vd); 614 extern void vdev_set_min_asize(vdev_t *vd); 615 extern uint64_t vdev_get_min_alloc(vdev_t *vd); 616 extern uint64_t vdev_get_nparity(vdev_t *vd); 617 extern uint64_t vdev_get_ndisks(vdev_t *vd); 618 619 /* 620 * Global variables 621 */ 622 extern int zfs_vdev_standard_sm_blksz; 623 /* zdb uses this tunable, so it must be declared here to make lint happy. */ 624 extern int zfs_vdev_cache_size; 625 626 /* 627 * Functions from vdev_indirect.c 628 */ 629 extern void vdev_indirect_sync_obsolete(vdev_t *vd, dmu_tx_t *tx); 630 extern boolean_t vdev_indirect_should_condense(vdev_t *vd); 631 extern void spa_condense_indirect_start_sync(vdev_t *vd, dmu_tx_t *tx); 632 extern int vdev_obsolete_sm_object(vdev_t *vd, uint64_t *sm_obj); 633 extern int vdev_obsolete_counts_are_precise(vdev_t *vd, boolean_t *are_precise); 634 635 /* 636 * Other miscellaneous functions 637 */ 638 int vdev_checkpoint_sm_object(vdev_t *vd, uint64_t *sm_obj); 639 640 /* 641 * Vdev ashift optimization tunables 642 */ 643 extern uint64_t zfs_vdev_min_auto_ashift; 644 extern uint64_t zfs_vdev_max_auto_ashift; 645 int param_set_min_auto_ashift(ZFS_MODULE_PARAM_ARGS); 646 int param_set_max_auto_ashift(ZFS_MODULE_PARAM_ARGS); 647 648 #ifdef __cplusplus 649 } 650 #endif 651 652 #endif /* _SYS_VDEV_IMPL_H */ 653