sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/vdev_impl.h

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