include/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  * 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_removal.h>
  42 #include <sys/zfs_ratelimit.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 const 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         clock_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         uint64_t        vq_last_offset;
 149         hrtime_t        vq_io_complete_ts; /* time last i/o completed */
 150         hrtime_t        vq_io_delta_ts;
 151         zio_t           vq_io_search; /* used as local for stack reduction */
 152         kmutex_t        vq_lock;
 153 };
 154
 155 typedef enum vdev_alloc_bias {
 156         VDEV_BIAS_NONE,
 157         VDEV_BIAS_LOG,          /* dedicated to ZIL data (SLOG) */
 158         VDEV_BIAS_SPECIAL,      /* dedicated to ddt, metadata, and small blks */
 159         VDEV_BIAS_DEDUP         /* dedicated to dedup metadata */
 160 } vdev_alloc_bias_t;
 161
 162
 163 /*
 164  * On-disk indirect vdev state.
 165  *
 166  * An indirect vdev is described exclusively in the MOS config of a pool.
 167  * The config for an indirect vdev includes several fields, which are
 168  * accessed in memory by a vdev_indirect_config_t.
 169  */
 170 typedef struct vdev_indirect_config {
 171         /*
 172          * Object (in MOS) which contains the indirect mapping. This object
 173          * contains an array of vdev_indirect_mapping_entry_phys_t ordered by
 174          * vimep_src. The bonus buffer for this object is a
 175          * vdev_indirect_mapping_phys_t. This object is allocated when a vdev
 176          * removal is initiated.
 177          *
 178          * Note that this object can be empty if none of the data on the vdev
 179          * has been copied yet.
 180          */
 181         uint64_t        vic_mapping_object;
 182
 183         /*
 184          * Object (in MOS) which contains the birth times for the mapping
 185          * entries. This object contains an array of
 186          * vdev_indirect_birth_entry_phys_t sorted by vibe_offset. The bonus
 187          * buffer for this object is a vdev_indirect_birth_phys_t. This object
 188          * is allocated when a vdev removal is initiated.
 189          *
 190          * Note that this object can be empty if none of the vdev has yet been
 191          * copied.
 192          */
 193         uint64_t        vic_births_object;
 194
 195         /*
 196          * This is the vdev ID which was removed previous to this vdev, or
 197          * UINT64_MAX if there are no previously removed vdevs.
 198          */
 199         uint64_t        vic_prev_indirect_vdev;
 200 } vdev_indirect_config_t;
 201
 202 /*
 203  * Virtual device descriptor
 204  */
 205 struct vdev {
 206         /*
 207          * Common to all vdev types.
 208          */
 209         uint64_t        vdev_id;        /* child number in vdev parent  */
 210         uint64_t        vdev_guid;      /* unique ID for this vdev      */
 211         uint64_t        vdev_guid_sum;  /* self guid + all child guids  */
 212         uint64_t        vdev_orig_guid; /* orig. guid prior to remove   */
 213         uint64_t        vdev_asize;     /* allocatable device capacity  */
 214         uint64_t        vdev_min_asize; /* min acceptable asize         */
 215         uint64_t        vdev_max_asize; /* max acceptable asize         */
 216         uint64_t        vdev_ashift;    /* block alignment shift        */
 217         uint64_t        vdev_state;     /* see VDEV_STATE_* #defines    */
 218         uint64_t        vdev_prevstate; /* used when reopening a vdev   */
 219         vdev_ops_t      *vdev_ops;      /* vdev operations              */
 220         spa_t           *vdev_spa;      /* spa for this vdev            */
 221         void            *vdev_tsd;      /* type-specific data           */
 222         vnode_t         *vdev_name_vp;  /* vnode for pathname           */
 223         vnode_t         *vdev_devid_vp; /* vnode for devid              */
 224         vdev_t          *vdev_top;      /* top-level vdev               */
 225         vdev_t          *vdev_parent;   /* parent vdev                  */
 226         vdev_t          **vdev_child;   /* array of children            */
 227         uint64_t        vdev_children;  /* number of children           */
 228         vdev_stat_t     vdev_stat;      /* virtual device statistics    */
 229         vdev_stat_ex_t  vdev_stat_ex;   /* extended statistics          */
 230         boolean_t       vdev_expanding; /* expand the vdev?             */
 231         boolean_t       vdev_reopening; /* reopen in progress?          */
 232         boolean_t       vdev_nonrot;    /* true if solid state          */
 233         int             vdev_open_error; /* error on last open          */
 234         kthread_t       *vdev_open_thread; /* thread opening children   */
 235         uint64_t        vdev_crtxg;     /* txg when top-level was added */
 236
 237         /*
 238          * Top-level vdev state.
 239          */
 240         uint64_t        vdev_ms_array;  /* metaslab array object        */
 241         uint64_t        vdev_ms_shift;  /* metaslab size shift          */
 242         uint64_t        vdev_ms_count;  /* number of metaslabs          */
 243         metaslab_group_t *vdev_mg;      /* metaslab group               */
 244         metaslab_t      **vdev_ms;      /* metaslab array               */
 245         uint64_t        vdev_pending_fastwrite; /* allocated fastwrites */
 246         txg_list_t      vdev_ms_list;   /* per-txg dirty metaslab lists */
 247         txg_list_t      vdev_dtl_list;  /* per-txg dirty DTL lists      */
 248         txg_node_t      vdev_txg_node;  /* per-txg dirty vdev linkage   */
 249         boolean_t       vdev_remove_wanted; /* async remove wanted?     */
 250         boolean_t       vdev_probe_wanted; /* async probe wanted?       */
 251         list_node_t     vdev_config_dirty_node; /* config dirty list    */
 252         list_node_t     vdev_state_dirty_node; /* state dirty list      */
 253         uint64_t        vdev_deflate_ratio; /* deflation ratio (x512)   */
 254         uint64_t        vdev_islog;     /* is an intent log device      */
 255         uint64_t        vdev_removing;  /* device is being removed?     */
 256         boolean_t       vdev_ishole;    /* is a hole in the namespace   */
 257         uint64_t        vdev_top_zap;
 258         vdev_alloc_bias_t vdev_alloc_bias; /* metaslab allocation bias  */
 259
 260         /* pool checkpoint related */
 261         space_map_t     *vdev_checkpoint_sm;    /* contains reserved blocks */
 262
 263         boolean_t       vdev_initialize_exit_wanted;
 264         vdev_initializing_state_t       vdev_initialize_state;
 265         list_node_t     vdev_initialize_node;
 266         kthread_t       *vdev_initialize_thread;
 267         /* Protects vdev_initialize_thread and vdev_initialize_state. */
 268         kmutex_t        vdev_initialize_lock;
 269         kcondvar_t      vdev_initialize_cv;
 270         uint64_t        vdev_initialize_offset[TXG_SIZE];
 271         uint64_t        vdev_initialize_last_offset;
 272         range_tree_t    *vdev_initialize_tree;  /* valid while initializing */
 273         uint64_t        vdev_initialize_bytes_est;
 274         uint64_t        vdev_initialize_bytes_done;
 275         time_t          vdev_initialize_action_time;    /* start and end time */
 276
 277         /* for limiting outstanding I/Os */
 278         kmutex_t        vdev_initialize_io_lock;
 279         kcondvar_t      vdev_initialize_io_cv;
 280         uint64_t        vdev_initialize_inflight;
 281
 282         /*
 283          * Values stored in the config for an indirect or removing vdev.
 284          */
 285         vdev_indirect_config_t  vdev_indirect_config;
 286
 287         /*
 288          * The vdev_indirect_rwlock protects the vdev_indirect_mapping
 289          * pointer from changing on indirect vdevs (when it is condensed).
 290          * Note that removing (not yet indirect) vdevs have different
 291          * access patterns (the mapping is not accessed from open context,
 292          * e.g. from zio_read) and locking strategy (e.g. svr_lock).
 293          */
 294         krwlock_t vdev_indirect_rwlock;
 295         vdev_indirect_mapping_t *vdev_indirect_mapping;
 296         vdev_indirect_births_t *vdev_indirect_births;
 297
 298         /*
 299          * In memory data structures used to manage the obsolete sm, for
 300          * indirect or removing vdevs.
 301          *
 302          * The vdev_obsolete_segments is the in-core record of the segments
 303          * that are no longer referenced anywhere in the pool (due to
 304          * being freed or remapped and not referenced by any snapshots).
 305          * During a sync, segments are added to vdev_obsolete_segments
 306          * via vdev_indirect_mark_obsolete(); at the end of each sync
 307          * pass, this is appended to vdev_obsolete_sm via
 308          * vdev_indirect_sync_obsolete().  The vdev_obsolete_lock
 309          * protects against concurrent modifications of vdev_obsolete_segments
 310          * from multiple zio threads.
 311          */
 312         kmutex_t        vdev_obsolete_lock;
 313         range_tree_t    *vdev_obsolete_segments;
 314         space_map_t     *vdev_obsolete_sm;
 315
 316         /*
 317          * Protects the vdev_scan_io_queue field itself as well as the
 318          * structure's contents (when present).
 319          */
 320         kmutex_t                        vdev_scan_io_queue_lock;
 321         struct dsl_scan_io_queue        *vdev_scan_io_queue;
 322
 323         /*
 324          * Leaf vdev state.
 325          */
 326         range_tree_t    *vdev_dtl[DTL_TYPES]; /* dirty time logs        */
 327         space_map_t     *vdev_dtl_sm;   /* dirty time log space map     */
 328         txg_node_t      vdev_dtl_node;  /* per-txg dirty DTL linkage    */
 329         uint64_t        vdev_dtl_object; /* DTL object                  */
 330         uint64_t        vdev_psize;     /* physical device capacity     */
 331         uint64_t        vdev_wholedisk; /* true if this is a whole disk */
 332         uint64_t        vdev_offline;   /* persistent offline state     */
 333         uint64_t        vdev_faulted;   /* persistent faulted state     */
 334         uint64_t        vdev_degraded;  /* persistent degraded state    */
 335         uint64_t        vdev_removed;   /* persistent removed state     */
 336         uint64_t        vdev_resilver_txg; /* persistent resilvering state */
 337         uint64_t        vdev_nparity;   /* number of parity devices for raidz */
 338         char            *vdev_path;     /* vdev path (if any)           */
 339         char            *vdev_devid;    /* vdev devid (if any)          */
 340         char            *vdev_physpath; /* vdev device path (if any)    */
 341         char            *vdev_enc_sysfs_path;   /* enclosure sysfs path */
 342         char            *vdev_fru;      /* physical FRU location        */
 343         uint64_t        vdev_not_present; /* not present during import  */
 344         uint64_t        vdev_unspare;   /* unspare when resilvering done */
 345         boolean_t       vdev_nowritecache; /* true if flushwritecache failed */
 346         boolean_t       vdev_checkremove; /* temporary online test      */
 347         boolean_t       vdev_forcefault; /* force online fault          */
 348         boolean_t       vdev_splitting; /* split or repair in progress  */
 349         boolean_t       vdev_delayed_close; /* delayed device close?    */
 350         boolean_t       vdev_tmpoffline; /* device taken offline temporarily? */
 351         boolean_t       vdev_detached;  /* device detached?             */
 352         boolean_t       vdev_cant_read; /* vdev is failing all reads    */
 353         boolean_t       vdev_cant_write; /* vdev is failing all writes  */
 354         boolean_t       vdev_isspare;   /* was a hot spare              */
 355         boolean_t       vdev_isl2cache; /* was a l2cache device         */
 356         boolean_t       vdev_copy_uberblocks;  /* post expand copy uberblocks */
 357         boolean_t       vdev_resilver_deferred;  /* resilver deferred */
 358         vdev_queue_t    vdev_queue;     /* I/O deadline schedule queue  */
 359         vdev_cache_t    vdev_cache;     /* physical block cache         */
 360         spa_aux_vdev_t  *vdev_aux;      /* for l2cache and spares vdevs */
 361         zio_t           *vdev_probe_zio; /* root of current probe       */
 362         vdev_aux_t      vdev_label_aux; /* on-disk aux state            */
 363         uint64_t        vdev_leaf_zap;
 364         hrtime_t        vdev_mmp_pending; /* 0 if write finished        */
 365         uint64_t        vdev_mmp_kstat_id;      /* to find kstat entry */
 366         uint64_t        vdev_expansion_time;    /* vdev's last expansion time */
 367
 368         /*
 369          * For DTrace to work in userland (libzpool) context, these fields must
 370          * remain at the end of the structure.  DTrace will use the kernel's
 371          * CTF definition for 'struct vdev', and since the size of a kmutex_t is
 372          * larger in userland, the offsets for the rest of the fields would be
 373          * incorrect.
 374          */
 375         kmutex_t        vdev_dtl_lock;  /* vdev_dtl_{map,resilver}      */
 376         kmutex_t        vdev_stat_lock; /* vdev_stat                    */
 377         kmutex_t        vdev_probe_lock; /* protects vdev_probe_zio     */
 378
 379         /*
 380          * We rate limit ZIO delay and ZIO checksum events, since they
 381          * can flood ZED with tons of events when a drive is acting up.
 382          */
 383         zfs_ratelimit_t vdev_delay_rl;
 384         zfs_ratelimit_t vdev_checksum_rl;
 385 };
 386
 387 #define VDEV_RAIDZ_MAXPARITY    3
 388
 389 #define VDEV_PAD_SIZE           (8 << 10)
 390 /* 2 padding areas (vl_pad1 and vl_pad2) to skip */
 391 #define VDEV_SKIP_SIZE          VDEV_PAD_SIZE * 2
 392 #define VDEV_PHYS_SIZE          (112 << 10)
 393 #define VDEV_UBERBLOCK_RING     (128 << 10)
 394
 395 /*
 396  * MMP blocks occupy the last MMP_BLOCKS_PER_LABEL slots in the uberblock
 397  * ring when MMP is enabled.
 398  */
 399 #define MMP_BLOCKS_PER_LABEL    1
 400
 401 /* The largest uberblock we support is 8k. */
 402 #define MAX_UBERBLOCK_SHIFT (13)
 403 #define VDEV_UBERBLOCK_SHIFT(vd)        \
 404         MIN(MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT), \
 405             MAX_UBERBLOCK_SHIFT)
 406 #define VDEV_UBERBLOCK_COUNT(vd)        \
 407         (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd))
 408 #define VDEV_UBERBLOCK_OFFSET(vd, n)    \
 409         offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)])
 410 #define VDEV_UBERBLOCK_SIZE(vd)         (1ULL << VDEV_UBERBLOCK_SHIFT(vd))
 411
 412 typedef struct vdev_phys {
 413         char            vp_nvlist[VDEV_PHYS_SIZE - sizeof (zio_eck_t)];
 414         zio_eck_t       vp_zbt;
 415 } vdev_phys_t;
 416
 417 typedef struct vdev_label {
 418         char            vl_pad1[VDEV_PAD_SIZE];                 /*  8K */
 419         char            vl_pad2[VDEV_PAD_SIZE];                 /*  8K */
 420         vdev_phys_t     vl_vdev_phys;                           /* 112K */
 421         char            vl_uberblock[VDEV_UBERBLOCK_RING];      /* 128K */
 422 } vdev_label_t;                                                 /* 256K total */
 423
 424 /*
 425  * vdev_dirty() flags
 426  */
 427 #define VDD_METASLAB    0x01
 428 #define VDD_DTL         0x02
 429
 430 /* Offset of embedded boot loader region on each label */
 431 #define VDEV_BOOT_OFFSET        (2 * sizeof (vdev_label_t))
 432 /*
 433  * Size of embedded boot loader region on each label.
 434  * The total size of the first two labels plus the boot area is 4MB.
 435  */
 436 #define VDEV_BOOT_SIZE          (7ULL << 19)                    /* 3.5M */
 437
 438 /*
 439  * Size of label regions at the start and end of each leaf device.
 440  */
 441 #define VDEV_LABEL_START_SIZE   (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE)
 442 #define VDEV_LABEL_END_SIZE     (2 * sizeof (vdev_label_t))
 443 #define VDEV_LABELS             4
 444 #define VDEV_BEST_LABEL         VDEV_LABELS
 445
 446 #define VDEV_ALLOC_LOAD         0
 447 #define VDEV_ALLOC_ADD          1
 448 #define VDEV_ALLOC_SPARE        2
 449 #define VDEV_ALLOC_L2CACHE      3
 450 #define VDEV_ALLOC_ROOTPOOL     4
 451 #define VDEV_ALLOC_SPLIT        5
 452 #define VDEV_ALLOC_ATTACH       6
 453
 454 /*
 455  * Allocate or free a vdev
 456  */
 457 extern vdev_t *vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid,
 458     vdev_ops_t *ops);
 459 extern int vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *config,
 460     vdev_t *parent, uint_t id, int alloctype);
 461 extern void vdev_free(vdev_t *vd);
 462
 463 /*
 464  * Add or remove children and parents
 465  */
 466 extern void vdev_add_child(vdev_t *pvd, vdev_t *cvd);
 467 extern void vdev_remove_child(vdev_t *pvd, vdev_t *cvd);
 468 extern void vdev_compact_children(vdev_t *pvd);
 469 extern vdev_t *vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops);
 470 extern void vdev_remove_parent(vdev_t *cvd);
 471
 472 /*
 473  * vdev sync load and sync
 474  */
 475 extern boolean_t vdev_log_state_valid(vdev_t *vd);
 476 extern int vdev_load(vdev_t *vd);
 477 extern int vdev_dtl_load(vdev_t *vd);
 478 extern void vdev_sync(vdev_t *vd, uint64_t txg);
 479 extern void vdev_sync_done(vdev_t *vd, uint64_t txg);
 480 extern void vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg);
 481 extern void vdev_dirty_leaves(vdev_t *vd, int flags, uint64_t txg);
 482
 483 /*
 484  * Available vdev types.
 485  */
 486 extern vdev_ops_t vdev_root_ops;
 487 extern vdev_ops_t vdev_mirror_ops;
 488 extern vdev_ops_t vdev_replacing_ops;
 489 extern vdev_ops_t vdev_raidz_ops;
 490 extern vdev_ops_t vdev_disk_ops;
 491 extern vdev_ops_t vdev_file_ops;
 492 extern vdev_ops_t vdev_missing_ops;
 493 extern vdev_ops_t vdev_hole_ops;
 494 extern vdev_ops_t vdev_spare_ops;
 495 extern vdev_ops_t vdev_indirect_ops;
 496
 497 /*
 498  * Common size functions
 499  */
 500 extern void vdev_default_xlate(vdev_t *vd, const range_seg_t *in,
 501     range_seg_t *out);
 502 extern uint64_t vdev_default_asize(vdev_t *vd, uint64_t psize);
 503 extern uint64_t vdev_get_min_asize(vdev_t *vd);
 504 extern void vdev_set_min_asize(vdev_t *vd);
 505
 506 /*
 507  * Global variables
 508  */
 509 extern int vdev_standard_sm_blksz;
 510 /* zdb uses this tunable, so it must be declared here to make lint happy. */
 511 extern int zfs_vdev_cache_size;
 512
 513 /*
 514  * Functions from vdev_indirect.c
 515  */
 516 extern void vdev_indirect_sync_obsolete(vdev_t *vd, dmu_tx_t *tx);
 517 extern boolean_t vdev_indirect_should_condense(vdev_t *vd);
 518 extern void spa_condense_indirect_start_sync(vdev_t *vd, dmu_tx_t *tx);
 519 extern int vdev_obsolete_sm_object(vdev_t *vd, uint64_t *sm_obj);
 520 extern int vdev_obsolete_counts_are_precise(vdev_t *vd, boolean_t *are_precise);
 521
 522 /*
 523  * Other miscellaneous functions
 524  */
 525 int vdev_checkpoint_sm_object(vdev_t *vd, uint64_t *sm_obj);
 526
 527 #ifdef  __cplusplus
 528 }
 529 #endif
 530
 531 #endif  /* _SYS_VDEV_IMPL_H */