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         boolean_t       vdev_nonrot;    /* true if solid state          */
 239         int             vdev_open_error; /* error on last open          */
 240         kthread_t       *vdev_open_thread; /* thread opening children   */
 241         uint64_t        vdev_crtxg;     /* txg when top-level was added */
 242
 243         /*
 244          * Top-level vdev state.
 245          */
 246         uint64_t        vdev_ms_array;  /* metaslab array object        */
 247         uint64_t        vdev_ms_shift;  /* metaslab size shift          */
 248         uint64_t        vdev_ms_count;  /* number of metaslabs          */
 249         metaslab_group_t *vdev_mg;      /* metaslab group               */
 250         metaslab_t      **vdev_ms;      /* metaslab array               */
 251         txg_list_t      vdev_ms_list;   /* per-txg dirty metaslab lists */
 252         txg_list_t      vdev_dtl_list;  /* per-txg dirty DTL lists      */
 253         txg_node_t      vdev_txg_node;  /* per-txg dirty vdev linkage   */
 254         boolean_t       vdev_remove_wanted; /* async remove wanted?     */
 255         boolean_t       vdev_probe_wanted; /* async probe wanted?       */
 256         list_node_t     vdev_config_dirty_node; /* config dirty list    */
 257         list_node_t     vdev_state_dirty_node; /* state dirty list      */
 258         uint64_t        vdev_deflate_ratio; /* deflation ratio (x512)   */
 259         uint64_t        vdev_islog;     /* is an intent log device      */
 260         uint64_t        vdev_removing;  /* device is being removed?     */
 261         boolean_t       vdev_ishole;    /* is a hole in the namespace   */
 262         kmutex_t        vdev_queue_lock; /* protects vdev_queue_depth   */
 263         uint64_t        vdev_top_zap;
 264
 265         /* pool checkpoint related */
 266         space_map_t     *vdev_checkpoint_sm;    /* contains reserved blocks */
 267
 268         boolean_t       vdev_initialize_exit_wanted;
 269         vdev_initializing_state_t       vdev_initialize_state;
 270         kthread_t       *vdev_initialize_thread;
 271         /* Protects vdev_initialize_thread and vdev_initialize_state. */
 272         kmutex_t        vdev_initialize_lock;
 273         kcondvar_t      vdev_initialize_cv;
 274         uint64_t        vdev_initialize_offset[TXG_SIZE];
 275         uint64_t        vdev_initialize_last_offset;
 276         range_tree_t    *vdev_initialize_tree;  /* valid while initializing */
 277         uint64_t        vdev_initialize_bytes_est;
 278         uint64_t        vdev_initialize_bytes_done;
 279         time_t          vdev_initialize_action_time;    /* start and end time */
 280
 281         /* for limiting outstanding I/Os */
 282         kmutex_t        vdev_initialize_io_lock;
 283         kcondvar_t      vdev_initialize_io_cv;
 284         uint64_t        vdev_initialize_inflight;
 285
 286         /*
 287          * Values stored in the config for an indirect or removing vdev.
 288          */
 289         vdev_indirect_config_t  vdev_indirect_config;
 290
 291         /*
 292          * The vdev_indirect_rwlock protects the vdev_indirect_mapping
 293          * pointer from changing on indirect vdevs (when it is condensed).
 294          * Note that removing (not yet indirect) vdevs have different
 295          * access patterns (the mapping is not accessed from open context,
 296          * e.g. from zio_read) and locking strategy (e.g. svr_lock).
 297          */
 298         krwlock_t vdev_indirect_rwlock;
 299         vdev_indirect_mapping_t *vdev_indirect_mapping;
 300         vdev_indirect_births_t *vdev_indirect_births;
 301
 302         /*
 303          * In memory data structures used to manage the obsolete sm, for
 304          * indirect or removing vdevs.
 305          *
 306          * The vdev_obsolete_segments is the in-core record of the segments
 307          * that are no longer referenced anywhere in the pool (due to
 308          * being freed or remapped and not referenced by any snapshots).
 309          * During a sync, segments are added to vdev_obsolete_segments
 310          * via vdev_indirect_mark_obsolete(); at the end of each sync
 311          * pass, this is appended to vdev_obsolete_sm via
 312          * vdev_indirect_sync_obsolete().  The vdev_obsolete_lock
 313          * protects against concurrent modifications of vdev_obsolete_segments
 314          * from multiple zio threads.
 315          */
 316         kmutex_t        vdev_obsolete_lock;
 317         range_tree_t    *vdev_obsolete_segments;
 318         space_map_t     *vdev_obsolete_sm;
 319
 320         /*
 321          * The queue depth parameters determine how many async writes are
 322          * still pending (i.e. allocated but not yet issued to disk) per
 323          * top-level (vdev_async_write_queue_depth) and the maximum allowed
 324          * (vdev_max_async_write_queue_depth). These values only apply to
 325          * top-level vdevs.
 326          */
 327         uint64_t        vdev_async_write_queue_depth;
 328         uint64_t        vdev_max_async_write_queue_depth;
 329
 330         /*
 331          * Protects the vdev_scan_io_queue field itself as well as the
 332          * structure's contents (when present).
 333          */
 334         kmutex_t                        vdev_scan_io_queue_lock;
 335         struct dsl_scan_io_queue        *vdev_scan_io_queue;
 336
 337         /*
 338          * Leaf vdev state.
 339          */
 340         range_tree_t    *vdev_dtl[DTL_TYPES]; /* dirty time logs        */
 341         space_map_t     *vdev_dtl_sm;   /* dirty time log space map     */
 342         txg_node_t      vdev_dtl_node;  /* per-txg dirty DTL linkage    */
 343         uint64_t        vdev_dtl_object; /* DTL object                  */
 344         uint64_t        vdev_psize;     /* physical device capacity     */
 345         uint64_t        vdev_wholedisk; /* true if this is a whole disk */
 346         uint64_t        vdev_offline;   /* persistent offline state     */
 347         uint64_t        vdev_faulted;   /* persistent faulted state     */
 348         uint64_t        vdev_degraded;  /* persistent degraded state    */
 349         uint64_t        vdev_removed;   /* persistent removed state     */
 350         uint64_t        vdev_resilver_txg; /* persistent resilvering state */
 351         uint64_t        vdev_nparity;   /* number of parity devices for raidz */
 352         char            *vdev_path;     /* vdev path (if any)           */
 353         char            *vdev_devid;    /* vdev devid (if any)          */
 354         char            *vdev_physpath; /* vdev device path (if any)    */
 355         char            *vdev_fru;      /* physical FRU location        */
 356         uint64_t        vdev_not_present; /* not present during import  */
 357         uint64_t        vdev_unspare;   /* unspare when resilvering done */
 358         boolean_t       vdev_nowritecache; /* true if flushwritecache failed */
 359         boolean_t       vdev_notrim;    /* true if trim failed */
 360         boolean_t       vdev_checkremove; /* temporary online test      */
 361         boolean_t       vdev_forcefault; /* force online fault          */
 362         boolean_t       vdev_splitting; /* split or repair in progress  */
 363         boolean_t       vdev_delayed_close; /* delayed device close?    */
 364         boolean_t       vdev_tmpoffline; /* device taken offline temporarily? */
 365         boolean_t       vdev_detached;  /* device detached?             */
 366         boolean_t       vdev_cant_read; /* vdev is failing all reads    */
 367         boolean_t       vdev_cant_write; /* vdev is failing all writes  */
 368         boolean_t       vdev_isspare;   /* was a hot spare              */
 369         boolean_t       vdev_isl2cache; /* was a l2cache device         */
 370         vdev_queue_t    vdev_queue;     /* I/O deadline schedule queue  */
 371         vdev_cache_t    vdev_cache;     /* physical block cache         */
 372         spa_aux_vdev_t  *vdev_aux;      /* for l2cache and spares vdevs */
 373         zio_t           *vdev_probe_zio; /* root of current probe       */
 374         vdev_aux_t      vdev_label_aux; /* on-disk aux state            */
 375         struct trim_map *vdev_trimmap;  /* map on outstanding trims     */
 376         uint64_t        vdev_leaf_zap;
 377
 378         /*
 379          * For DTrace to work in userland (libzpool) context, these fields must
 380          * remain at the end of the structure.  DTrace will use the kernel's
 381          * CTF definition for 'struct vdev', and since the size of a kmutex_t is
 382          * larger in userland, the offsets for the rest of the fields would be
 383          * incorrect.
 384          */
 385         kmutex_t        vdev_dtl_lock;  /* vdev_dtl_{map,resilver}      */
 386         kmutex_t        vdev_stat_lock; /* vdev_stat                    */
 387         kmutex_t        vdev_probe_lock; /* protects vdev_probe_zio     */
 388 };
 389
 390 #define VDEV_RAIDZ_MAXPARITY    3
 391
 392 #define VDEV_PAD_SIZE           (8 << 10)
 393 /* 2 padding areas (vl_pad1 and vl_pad2) to skip */
 394 #define VDEV_SKIP_SIZE          VDEV_PAD_SIZE * 2
 395 #define VDEV_PHYS_SIZE          (112 << 10)
 396 #define VDEV_UBERBLOCK_RING     (128 << 10)
 397
 398 /* The largest uberblock we support is 8k. */
 399 #define MAX_UBERBLOCK_SHIFT (13)
 400 #define VDEV_UBERBLOCK_SHIFT(vd)        \
 401         MIN(MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT), \
 402             MAX_UBERBLOCK_SHIFT)
 403 #define VDEV_UBERBLOCK_COUNT(vd)        \
 404         (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd))
 405 #define VDEV_UBERBLOCK_OFFSET(vd, n)    \
 406         offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)])
 407 #define VDEV_UBERBLOCK_SIZE(vd)         (1ULL << VDEV_UBERBLOCK_SHIFT(vd))
 408
 409 typedef struct vdev_phys {
 410         char            vp_nvlist[VDEV_PHYS_SIZE - sizeof (zio_eck_t)];
 411         zio_eck_t       vp_zbt;
 412 } vdev_phys_t;
 413
 414 typedef struct vdev_label {
 415         char            vl_pad1[VDEV_PAD_SIZE];                 /*  8K */
 416         char            vl_pad2[VDEV_PAD_SIZE];                 /*  8K */
 417         vdev_phys_t     vl_vdev_phys;                           /* 112K */
 418         char            vl_uberblock[VDEV_UBERBLOCK_RING];      /* 128K */
 419 } vdev_label_t;                                                 /* 256K total */
 420
 421 /*
 422  * vdev_dirty() flags
 423  */
 424 #define VDD_METASLAB    0x01
 425 #define VDD_DTL         0x02
 426
 427 /* Offset of embedded boot loader region on each label */
 428 #define VDEV_BOOT_OFFSET        (2 * sizeof (vdev_label_t))
 429 /*
 430  * Size of embedded boot loader region on each label.
 431  * The total size of the first two labels plus the boot area is 4MB.
 432  */
 433 #define VDEV_BOOT_SIZE          (7ULL << 19)                    /* 3.5M */
 434
 435 /*
 436  * Size of label regions at the start and end of each leaf device.
 437  */
 438 #define VDEV_LABEL_START_SIZE   (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE)
 439 #define VDEV_LABEL_END_SIZE     (2 * sizeof (vdev_label_t))
 440 #define VDEV_LABELS             4
 441 #define VDEV_BEST_LABEL         VDEV_LABELS
 442
 443 #define VDEV_ALLOC_LOAD         0
 444 #define VDEV_ALLOC_ADD          1
 445 #define VDEV_ALLOC_SPARE        2
 446 #define VDEV_ALLOC_L2CACHE      3
 447 #define VDEV_ALLOC_ROOTPOOL     4
 448 #define VDEV_ALLOC_SPLIT        5
 449 #define VDEV_ALLOC_ATTACH       6
 450
 451 /*
 452  * Allocate or free a vdev
 453  */
 454 extern vdev_t *vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid,
 455     vdev_ops_t *ops);
 456 extern int vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *config,
 457     vdev_t *parent, uint_t id, int alloctype);
 458 extern void vdev_free(vdev_t *vd);
 459
 460 /*
 461  * Add or remove children and parents
 462  */
 463 extern void vdev_add_child(vdev_t *pvd, vdev_t *cvd);
 464 extern void vdev_remove_child(vdev_t *pvd, vdev_t *cvd);
 465 extern void vdev_compact_children(vdev_t *pvd);
 466 extern vdev_t *vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops);
 467 extern void vdev_remove_parent(vdev_t *cvd);
 468
 469 /*
 470  * vdev sync load and sync
 471  */
 472 extern boolean_t vdev_log_state_valid(vdev_t *vd);
 473 extern int vdev_load(vdev_t *vd);
 474 extern int vdev_dtl_load(vdev_t *vd);
 475 extern void vdev_sync(vdev_t *vd, uint64_t txg);
 476 extern void vdev_sync_done(vdev_t *vd, uint64_t txg);
 477 extern void vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg);
 478 extern void vdev_dirty_leaves(vdev_t *vd, int flags, uint64_t txg);
 479
 480 /*
 481  * Available vdev types.
 482  */
 483 extern vdev_ops_t vdev_root_ops;
 484 extern vdev_ops_t vdev_mirror_ops;
 485 extern vdev_ops_t vdev_replacing_ops;
 486 extern vdev_ops_t vdev_raidz_ops;
 487 #ifdef _KERNEL
 488 extern vdev_ops_t vdev_geom_ops;
 489 #else
 490 extern vdev_ops_t vdev_disk_ops;
 491 #endif
 492 extern vdev_ops_t vdev_file_ops;
 493 extern vdev_ops_t vdev_missing_ops;
 494 extern vdev_ops_t vdev_hole_ops;
 495 extern vdev_ops_t vdev_spare_ops;
 496 extern vdev_ops_t vdev_indirect_ops;
 497
 498 /*
 499  * Common size functions
 500  */
 501 extern void vdev_default_xlate(vdev_t *vd, const range_seg_t *in,
 502     range_seg_t *out);
 503 extern uint64_t vdev_default_asize(vdev_t *vd, uint64_t psize);
 504 extern uint64_t vdev_get_min_asize(vdev_t *vd);
 505 extern void vdev_set_min_asize(vdev_t *vd);
 506
 507 /*
 508  * Global variables
 509  */
 510 extern int vdev_standard_sm_blksz;
 511 /* zdb uses this tunable, so it must be declared here to make lint happy. */
 512 extern int zfs_vdev_cache_size;
 513 extern uint_t zfs_geom_probe_vdev_key;
 514
 515 /*
 516  * Functions from vdev_indirect.c
 517  */
 518 extern void vdev_indirect_sync_obsolete(vdev_t *vd, dmu_tx_t *tx);
 519 extern boolean_t vdev_indirect_should_condense(vdev_t *vd);
 520 extern void spa_condense_indirect_start_sync(vdev_t *vd, dmu_tx_t *tx);
 521 extern int vdev_obsolete_sm_object(vdev_t *vd);
 522 extern boolean_t vdev_obsolete_counts_are_precise(vdev_t *vd);
 523
 524 #ifdef illumos
 525 /*
 526  * Other miscellaneous functions
 527  */
 528 int vdev_checkpoint_sm_object(vdev_t *vd);
 529
 530 /*
 531  * The vdev_buf_t is used to translate between zio_t and buf_t, and back again.
 532  */
 533 typedef struct vdev_buf {
 534         buf_t   vb_buf;         /* buffer that describes the io */
 535         zio_t   *vb_io;         /* pointer back to the original zio_t */
 536 } vdev_buf_t;
 537 #endif
 538
 539 #ifdef  __cplusplus
 540 }
 541 #endif
 542
 543 #endif  /* _SYS_VDEV_IMPL_H */