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  * 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
  43 #ifdef  __cplusplus
  44 extern "C" {
  45 #endif
  46
  47 /*
  48  * Virtual device descriptors.
  49  *
  50  * All storage pool operations go through the virtual device framework,
  51  * which provides data replication and I/O scheduling.
  52  */
  53
  54 /*
  55  * Forward declarations that lots of things need.
  56  */
  57 typedef struct vdev_queue vdev_queue_t;
  58 typedef struct vdev_cache vdev_cache_t;
  59 typedef struct vdev_cache_entry vdev_cache_entry_t;
  60 struct abd;
  61
  62 extern int zfs_vdev_queue_depth_pct;
  63 extern int zfs_vdev_def_queue_depth;
  64 extern uint32_t zfs_vdev_async_write_max_active;
  65
  66 /*
  67  * Virtual device operations
  68  */
  69 typedef int     vdev_open_func_t(vdev_t *vd, uint64_t *size, uint64_t *max_size,
  70     uint64_t *logical_ashift, uint64_t *physical_ashift);
  71 typedef void    vdev_close_func_t(vdev_t *vd);
  72 typedef uint64_t vdev_asize_func_t(vdev_t *vd, uint64_t psize);
  73 typedef void    vdev_io_start_func_t(zio_t *zio);
  74 typedef void    vdev_io_done_func_t(zio_t *zio);
  75 typedef void    vdev_state_change_func_t(vdev_t *vd, int, int);
  76 typedef boolean_t vdev_need_resilver_func_t(vdev_t *vd, uint64_t, size_t);
  77 typedef void    vdev_hold_func_t(vdev_t *vd);
  78 typedef void    vdev_rele_func_t(vdev_t *vd);
  79
  80 typedef void    vdev_remap_cb_t(uint64_t inner_offset, vdev_t *vd,
  81     uint64_t offset, uint64_t size, void *arg);
  82 typedef void    vdev_remap_func_t(vdev_t *vd, uint64_t offset, uint64_t size,
  83     vdev_remap_cb_t callback, void *arg);
  84 /*
  85  * Given a target vdev, translates the logical range "in" to the physical
  86  * range "res"
  87  */
  88 typedef void vdev_xlation_func_t(vdev_t *cvd, const range_seg_t *in,
  89     range_seg_t *res);
  90
  91 typedef struct vdev_ops {
  92         vdev_open_func_t                *vdev_op_open;
  93         vdev_close_func_t               *vdev_op_close;
  94         vdev_asize_func_t               *vdev_op_asize;
  95         vdev_io_start_func_t            *vdev_op_io_start;
  96         vdev_io_done_func_t             *vdev_op_io_done;
  97         vdev_state_change_func_t        *vdev_op_state_change;
  98         vdev_need_resilver_func_t       *vdev_op_need_resilver;
  99         vdev_hold_func_t                *vdev_op_hold;
 100         vdev_rele_func_t                *vdev_op_rele;
 101         vdev_remap_func_t               *vdev_op_remap;
 102         /*
 103          * For translating ranges from non-leaf vdevs (e.g. raidz) to leaves.
 104          * Used when initializing vdevs. Isn't used by leaf ops.
 105          */
 106         vdev_xlation_func_t             *vdev_op_xlate;
 107         char                            vdev_op_type[16];
 108         boolean_t                       vdev_op_leaf;
 109 } vdev_ops_t;
 110
 111 /*
 112  * Virtual device properties
 113  */
 114 struct vdev_cache_entry {
 115         struct abd      *ve_abd;
 116         uint64_t        ve_offset;
 117         uint64_t        ve_lastused;
 118         avl_node_t      ve_offset_node;
 119         avl_node_t      ve_lastused_node;
 120         uint32_t        ve_hits;
 121         uint16_t        ve_missed_update;
 122         zio_t           *ve_fill_io;
 123 };
 124
 125 struct vdev_cache {
 126         avl_tree_t      vc_offset_tree;
 127         avl_tree_t      vc_lastused_tree;
 128         kmutex_t        vc_lock;
 129 };
 130
 131 typedef struct vdev_queue_class {
 132         uint32_t        vqc_active;
 133
 134         /*
 135          * Sorted by offset or timestamp, depending on if the queue is
 136          * LBA-ordered vs FIFO.
 137          */
 138         avl_tree_t      vqc_queued_tree;
 139 } vdev_queue_class_t;
 140
 141 struct vdev_queue {
 142         vdev_t          *vq_vdev;
 143         vdev_queue_class_t vq_class[ZIO_PRIORITY_NUM_QUEUEABLE];
 144         avl_tree_t      vq_active_tree;
 145         avl_tree_t      vq_read_offset_tree;
 146         avl_tree_t      vq_write_offset_tree;
 147         uint64_t        vq_last_offset;
 148         hrtime_t        vq_io_complete_ts; /* time last i/o completed */
 149         kmutex_t        vq_lock;
 150         uint64_t        vq_lastoffset;
 151 };
 152
 153 typedef enum vdev_alloc_bias {
 154         VDEV_BIAS_NONE,
 155         VDEV_BIAS_LOG,          /* dedicated to ZIL data (SLOG) */
 156         VDEV_BIAS_SPECIAL,      /* dedicated to ddt, metadata, and small blks */
 157         VDEV_BIAS_DEDUP         /* dedicated to dedup metadata */
 158 } vdev_alloc_bias_t;
 159
 160
 161 /*
 162  * On-disk indirect vdev state.
 163  *
 164  * An indirect vdev is described exclusively in the MOS config of a pool.
 165  * The config for an indirect vdev includes several fields, which are
 166  * accessed in memory by a vdev_indirect_config_t.
 167  */
 168 typedef struct vdev_indirect_config {
 169         /*
 170          * Object (in MOS) which contains the indirect mapping. This object
 171          * contains an array of vdev_indirect_mapping_entry_phys_t ordered by
 172          * vimep_src. The bonus buffer for this object is a
 173          * vdev_indirect_mapping_phys_t. This object is allocated when a vdev
 174          * removal is initiated.
 175          *
 176          * Note that this object can be empty if none of the data on the vdev
 177          * has been copied yet.
 178          */
 179         uint64_t        vic_mapping_object;
 180
 181         /*
 182          * Object (in MOS) which contains the birth times for the mapping
 183          * entries. This object contains an array of
 184          * vdev_indirect_birth_entry_phys_t sorted by vibe_offset. The bonus
 185          * buffer for this object is a vdev_indirect_birth_phys_t. This object
 186          * is allocated when a vdev removal is initiated.
 187          *
 188          * Note that this object can be empty if none of the vdev has yet been
 189          * copied.
 190          */
 191         uint64_t        vic_births_object;
 192
 193         /*
 194          * This is the vdev ID which was removed previous to this vdev, or
 195          * UINT64_MAX if there are no previously removed vdevs.
 196          */
 197         uint64_t        vic_prev_indirect_vdev;
 198 } vdev_indirect_config_t;
 199
 200 /*
 201  * Virtual device descriptor
 202  */
 203 struct vdev {
 204         /*
 205          * Common to all vdev types.
 206          */
 207         uint64_t        vdev_id;        /* child number in vdev parent  */
 208         uint64_t        vdev_guid;      /* unique ID for this vdev      */
 209         uint64_t        vdev_guid_sum;  /* self guid + all child guids  */
 210         uint64_t        vdev_orig_guid; /* orig. guid prior to remove   */
 211         uint64_t        vdev_asize;     /* allocatable device capacity  */
 212         uint64_t        vdev_min_asize; /* min acceptable asize         */
 213         uint64_t        vdev_max_asize; /* max acceptable asize         */
 214         uint64_t        vdev_ashift;    /* block alignment shift        */
 215         /*
 216          * Logical block alignment shift
 217          *
 218          * The smallest sized/aligned I/O supported by the device.
 219          */
 220         uint64_t        vdev_logical_ashift;
 221         /*
 222          * Physical block alignment shift
 223          *
 224          * The device supports logical I/Os with vdev_logical_ashift
 225          * size/alignment, but optimum performance will be achieved by
 226          * aligning/sizing requests to vdev_physical_ashift.  Smaller
 227          * requests may be inflated or incur device level read-modify-write
 228          * operations.
 229          *
 230          * May be 0 to indicate no preference (i.e. use vdev_logical_ashift).
 231          */
 232         uint64_t        vdev_physical_ashift;
 233         uint64_t        vdev_state;     /* see VDEV_STATE_* #defines    */
 234         uint64_t        vdev_prevstate; /* used when reopening a vdev   */
 235         vdev_ops_t      *vdev_ops;      /* vdev operations              */
 236         spa_t           *vdev_spa;      /* spa for this vdev            */
 237         void            *vdev_tsd;      /* type-specific data           */
 238         vnode_t         *vdev_name_vp;  /* vnode for pathname           */
 239         vnode_t         *vdev_devid_vp; /* vnode for devid              */
 240         vdev_t          *vdev_top;      /* top-level vdev               */
 241         vdev_t          *vdev_parent;   /* parent vdev                  */
 242         vdev_t          **vdev_child;   /* array of children            */
 243         uint64_t        vdev_children;  /* number of children           */
 244         vdev_stat_t     vdev_stat;      /* virtual device statistics    */
 245         boolean_t       vdev_expanding; /* expand the vdev?             */
 246         boolean_t       vdev_reopening; /* reopen in progress?          */
 247         boolean_t       vdev_nonrot;    /* true if solid state          */
 248         int             vdev_open_error; /* error on last open          */
 249         kthread_t       *vdev_open_thread; /* thread opening children   */
 250         uint64_t        vdev_crtxg;     /* txg when top-level was added */
 251
 252         /*
 253          * Top-level vdev state.
 254          */
 255         uint64_t        vdev_ms_array;  /* metaslab array object        */
 256         uint64_t        vdev_ms_shift;  /* metaslab size shift          */
 257         uint64_t        vdev_ms_count;  /* number of metaslabs          */
 258         metaslab_group_t *vdev_mg;      /* metaslab group               */
 259         metaslab_t      **vdev_ms;      /* metaslab array               */
 260         txg_list_t      vdev_ms_list;   /* per-txg dirty metaslab lists */
 261         txg_list_t      vdev_dtl_list;  /* per-txg dirty DTL lists      */
 262         txg_node_t      vdev_txg_node;  /* per-txg dirty vdev linkage   */
 263         boolean_t       vdev_remove_wanted; /* async remove wanted?     */
 264         boolean_t       vdev_probe_wanted; /* async probe wanted?       */
 265         list_node_t     vdev_config_dirty_node; /* config dirty list    */
 266         list_node_t     vdev_state_dirty_node; /* state dirty list      */
 267         uint64_t        vdev_deflate_ratio; /* deflation ratio (x512)   */
 268         uint64_t        vdev_islog;     /* is an intent log device      */
 269         uint64_t        vdev_removing;  /* device is being removed?     */
 270         boolean_t       vdev_ishole;    /* is a hole in the namespace   */
 271         uint64_t        vdev_top_zap;
 272         vdev_alloc_bias_t vdev_alloc_bias; /* metaslab allocation bias  */
 273
 274         /* pool checkpoint related */
 275         space_map_t     *vdev_checkpoint_sm;    /* contains reserved blocks */
 276
 277         boolean_t       vdev_initialize_exit_wanted;
 278         vdev_initializing_state_t       vdev_initialize_state;
 279         kthread_t       *vdev_initialize_thread;
 280         /* Protects vdev_initialize_thread and vdev_initialize_state. */
 281         kmutex_t        vdev_initialize_lock;
 282         kcondvar_t      vdev_initialize_cv;
 283         uint64_t        vdev_initialize_offset[TXG_SIZE];
 284         uint64_t        vdev_initialize_last_offset;
 285         range_tree_t    *vdev_initialize_tree;  /* valid while initializing */
 286         uint64_t        vdev_initialize_bytes_est;
 287         uint64_t        vdev_initialize_bytes_done;
 288         time_t          vdev_initialize_action_time;    /* start and end time */
 289
 290         /* for limiting outstanding I/Os */
 291         kmutex_t        vdev_initialize_io_lock;
 292         kcondvar_t      vdev_initialize_io_cv;
 293         uint64_t        vdev_initialize_inflight;
 294
 295         /*
 296          * Values stored in the config for an indirect or removing vdev.
 297          */
 298         vdev_indirect_config_t  vdev_indirect_config;
 299
 300         /*
 301          * The vdev_indirect_rwlock protects the vdev_indirect_mapping
 302          * pointer from changing on indirect vdevs (when it is condensed).
 303          * Note that removing (not yet indirect) vdevs have different
 304          * access patterns (the mapping is not accessed from open context,
 305          * e.g. from zio_read) and locking strategy (e.g. svr_lock).
 306          */
 307         krwlock_t vdev_indirect_rwlock;
 308         vdev_indirect_mapping_t *vdev_indirect_mapping;
 309         vdev_indirect_births_t *vdev_indirect_births;
 310
 311         /*
 312          * In memory data structures used to manage the obsolete sm, for
 313          * indirect or removing vdevs.
 314          *
 315          * The vdev_obsolete_segments is the in-core record of the segments
 316          * that are no longer referenced anywhere in the pool (due to
 317          * being freed or remapped and not referenced by any snapshots).
 318          * During a sync, segments are added to vdev_obsolete_segments
 319          * via vdev_indirect_mark_obsolete(); at the end of each sync
 320          * pass, this is appended to vdev_obsolete_sm via
 321          * vdev_indirect_sync_obsolete().  The vdev_obsolete_lock
 322          * protects against concurrent modifications of vdev_obsolete_segments
 323          * from multiple zio threads.
 324          */
 325         kmutex_t        vdev_obsolete_lock;
 326         range_tree_t    *vdev_obsolete_segments;
 327         space_map_t     *vdev_obsolete_sm;
 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         uint64_t        vdev_leaf_zap;
 376         hrtime_t        vdev_mmp_pending; /* 0 if write finished        */
 377         uint64_t        vdev_mmp_kstat_id;      /* to find kstat entry */
 378         list_node_t     vdev_leaf_node;         /* leaf vdev list */
 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 /*
 401  * MMP blocks occupy the last MMP_BLOCKS_PER_LABEL slots in the uberblock
 402  * ring when MMP is enabled.
 403  */
 404 #define MMP_BLOCKS_PER_LABEL    1
 405
 406 /* The largest uberblock we support is 8k. */
 407 #define MAX_UBERBLOCK_SHIFT (13)
 408 #define VDEV_UBERBLOCK_SHIFT(vd)        \
 409         MIN(MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT), \
 410             MAX_UBERBLOCK_SHIFT)
 411 #define VDEV_UBERBLOCK_COUNT(vd)        \
 412         (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd))
 413 #define VDEV_UBERBLOCK_OFFSET(vd, n)    \
 414         offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)])
 415 #define VDEV_UBERBLOCK_SIZE(vd)         (1ULL << VDEV_UBERBLOCK_SHIFT(vd))
 416
 417 typedef struct vdev_phys {
 418         char            vp_nvlist[VDEV_PHYS_SIZE - sizeof (zio_eck_t)];
 419         zio_eck_t       vp_zbt;
 420 } vdev_phys_t;
 421
 422 typedef struct vdev_label {
 423         char            vl_pad1[VDEV_PAD_SIZE];                 /*  8K */
 424         char            vl_pad2[VDEV_PAD_SIZE];                 /*  8K */
 425         vdev_phys_t     vl_vdev_phys;                           /* 112K */
 426         char            vl_uberblock[VDEV_UBERBLOCK_RING];      /* 128K */
 427 } vdev_label_t;                                                 /* 256K total */
 428
 429 /*
 430  * vdev_dirty() flags
 431  */
 432 #define VDD_METASLAB    0x01
 433 #define VDD_DTL         0x02
 434
 435 /* Offset of embedded boot loader region on each label */
 436 #define VDEV_BOOT_OFFSET        (2 * sizeof (vdev_label_t))
 437 /*
 438  * Size of embedded boot loader region on each label.
 439  * The total size of the first two labels plus the boot area is 4MB.
 440  */
 441 #define VDEV_BOOT_SIZE          (7ULL << 19)                    /* 3.5M */
 442
 443 /*
 444  * Size of label regions at the start and end of each leaf device.
 445  */
 446 #define VDEV_LABEL_START_SIZE   (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE)
 447 #define VDEV_LABEL_END_SIZE     (2 * sizeof (vdev_label_t))
 448 #define VDEV_LABELS             4
 449 #define VDEV_BEST_LABEL         VDEV_LABELS
 450
 451 #define VDEV_ALLOC_LOAD         0
 452 #define VDEV_ALLOC_ADD          1
 453 #define VDEV_ALLOC_SPARE        2
 454 #define VDEV_ALLOC_L2CACHE      3
 455 #define VDEV_ALLOC_ROOTPOOL     4
 456 #define VDEV_ALLOC_SPLIT        5
 457 #define VDEV_ALLOC_ATTACH       6
 458
 459 /*
 460  * Allocate or free a vdev
 461  */
 462 extern vdev_t *vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid,
 463     vdev_ops_t *ops);
 464 extern int vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *config,
 465     vdev_t *parent, uint_t id, int alloctype);
 466 extern void vdev_free(vdev_t *vd);
 467
 468 /*
 469  * Add or remove children and parents
 470  */
 471 extern void vdev_add_child(vdev_t *pvd, vdev_t *cvd);
 472 extern void vdev_remove_child(vdev_t *pvd, vdev_t *cvd);
 473 extern void vdev_compact_children(vdev_t *pvd);
 474 extern vdev_t *vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops);
 475 extern void vdev_remove_parent(vdev_t *cvd);
 476
 477 /*
 478  * vdev sync load and sync
 479  */
 480 extern boolean_t vdev_log_state_valid(vdev_t *vd);
 481 extern int vdev_load(vdev_t *vd);
 482 extern int vdev_dtl_load(vdev_t *vd);
 483 extern void vdev_sync(vdev_t *vd, uint64_t txg);
 484 extern void vdev_sync_done(vdev_t *vd, uint64_t txg);
 485 extern void vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg);
 486 extern void vdev_dirty_leaves(vdev_t *vd, int flags, uint64_t txg);
 487
 488 /*
 489  * Available vdev types.
 490  */
 491 extern vdev_ops_t vdev_root_ops;
 492 extern vdev_ops_t vdev_mirror_ops;
 493 extern vdev_ops_t vdev_replacing_ops;
 494 extern vdev_ops_t vdev_raidz_ops;
 495 #ifdef _KERNEL
 496 extern vdev_ops_t vdev_geom_ops;
 497 #else
 498 extern vdev_ops_t vdev_disk_ops;
 499 #endif
 500 extern vdev_ops_t vdev_file_ops;
 501 extern vdev_ops_t vdev_missing_ops;
 502 extern vdev_ops_t vdev_hole_ops;
 503 extern vdev_ops_t vdev_spare_ops;
 504 extern vdev_ops_t vdev_indirect_ops;
 505
 506 /*
 507  * Common size functions
 508  */
 509 extern void vdev_default_xlate(vdev_t *vd, const range_seg_t *in,
 510     range_seg_t *out);
 511 extern uint64_t vdev_default_asize(vdev_t *vd, uint64_t psize);
 512 extern uint64_t vdev_get_min_asize(vdev_t *vd);
 513 extern void vdev_set_min_asize(vdev_t *vd);
 514
 515 /*
 516  * Global variables
 517  */
 518 extern int vdev_standard_sm_blksz;
 519 /* zdb uses this tunable, so it must be declared here to make lint happy. */
 520 extern int zfs_vdev_cache_size;
 521 extern uint_t zfs_geom_probe_vdev_key;
 522
 523 /*
 524  * Functions from vdev_indirect.c
 525  */
 526 extern void vdev_indirect_sync_obsolete(vdev_t *vd, dmu_tx_t *tx);
 527 extern boolean_t vdev_indirect_should_condense(vdev_t *vd);
 528 extern void spa_condense_indirect_start_sync(vdev_t *vd, dmu_tx_t *tx);
 529 extern int vdev_obsolete_sm_object(vdev_t *vd);
 530 extern boolean_t vdev_obsolete_counts_are_precise(vdev_t *vd);
 531
 532 #ifdef illumos
 533 /*
 534  * Other miscellaneous functions
 535  */
 536 int vdev_checkpoint_sm_object(vdev_t *vd);
 537
 538 /*
 539  * The vdev_buf_t is used to translate between zio_t and buf_t, and back again.
 540  */
 541 typedef struct vdev_buf {
 542         buf_t   vb_buf;         /* buffer that describes the io */
 543         zio_t   *vb_io;         /* pointer back to the original zio_t */
 544 } vdev_buf_t;
 545 #endif
 546
 547 #ifdef  __cplusplus
 548 }
 549 #endif
 550
 551 #endif  /* _SYS_VDEV_IMPL_H */