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 https://opensource.org/licenses/CDDL-1.0.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  23  * Copyright (c) 2011, 2020 by Delphix. All rights reserved.
  24  * Copyright (c) 2017, Intel Corporation.
  25  */
  26
  27 #ifndef _SYS_VDEV_IMPL_H
  28 #define _SYS_VDEV_IMPL_H
  29
  30 #include <sys/avl.h>
  31 #include <sys/bpobj.h>
  32 #include <sys/dmu.h>
  33 #include <sys/metaslab.h>
  34 #include <sys/nvpair.h>
  35 #include <sys/space_map.h>
  36 #include <sys/vdev.h>
  37 #include <sys/dkio.h>
  38 #include <sys/uberblock_impl.h>
  39 #include <sys/vdev_indirect_mapping.h>
  40 #include <sys/vdev_indirect_births.h>
  41 #include <sys/vdev_rebuild.h>
  42 #include <sys/vdev_removal.h>
  43 #include <sys/zfs_ratelimit.h>
  44
  45 #ifdef  __cplusplus
  46 extern "C" {
  47 #endif
  48
  49 /*
  50  * Virtual device descriptors.
  51  *
  52  * All storage pool operations go through the virtual device framework,
  53  * which provides data replication and I/O scheduling.
  54  */
  55
  56 /*
  57  * Forward declarations that lots of things need.
  58  */
  59 typedef struct vdev_queue vdev_queue_t;
  60 typedef struct vdev_cache vdev_cache_t;
  61 typedef struct vdev_cache_entry vdev_cache_entry_t;
  62 struct abd;
  63
  64 extern uint_t zfs_vdev_queue_depth_pct;
  65 extern uint_t zfs_vdev_def_queue_depth;
  66 extern uint_t zfs_vdev_async_write_max_active;
  67
  68 /*
  69  * Virtual device operations
  70  */
  71 typedef int     vdev_init_func_t(spa_t *spa, nvlist_t *nv, void **tsd);
  72 typedef void    vdev_fini_func_t(vdev_t *vd);
  73 typedef int     vdev_open_func_t(vdev_t *vd, uint64_t *size, uint64_t *max_size,
  74     uint64_t *ashift, uint64_t *pshift);
  75 typedef void    vdev_close_func_t(vdev_t *vd);
  76 typedef uint64_t vdev_asize_func_t(vdev_t *vd, uint64_t psize);
  77 typedef uint64_t vdev_min_asize_func_t(vdev_t *vd);
  78 typedef uint64_t vdev_min_alloc_func_t(vdev_t *vd);
  79 typedef void    vdev_io_start_func_t(zio_t *zio);
  80 typedef void    vdev_io_done_func_t(zio_t *zio);
  81 typedef void    vdev_state_change_func_t(vdev_t *vd, int, int);
  82 typedef boolean_t vdev_need_resilver_func_t(vdev_t *vd, const dva_t *dva,
  83     size_t psize, uint64_t phys_birth);
  84 typedef void    vdev_hold_func_t(vdev_t *vd);
  85 typedef void    vdev_rele_func_t(vdev_t *vd);
  86
  87 typedef void    vdev_remap_cb_t(uint64_t inner_offset, vdev_t *vd,
  88     uint64_t offset, uint64_t size, void *arg);
  89 typedef void    vdev_remap_func_t(vdev_t *vd, uint64_t offset, uint64_t size,
  90     vdev_remap_cb_t callback, void *arg);
  91 /*
  92  * Given a target vdev, translates the logical range "in" to the physical
  93  * range "res"
  94  */
  95 typedef void vdev_xlation_func_t(vdev_t *cvd, const range_seg64_t *logical,
  96     range_seg64_t *physical, range_seg64_t *remain);
  97 typedef uint64_t vdev_rebuild_asize_func_t(vdev_t *vd, uint64_t start,
  98     uint64_t size, uint64_t max_segment);
  99 typedef void vdev_metaslab_init_func_t(vdev_t *vd, uint64_t *startp,
 100     uint64_t *sizep);
 101 typedef void vdev_config_generate_func_t(vdev_t *vd, nvlist_t *nv);
 102 typedef uint64_t vdev_nparity_func_t(vdev_t *vd);
 103 typedef uint64_t vdev_ndisks_func_t(vdev_t *vd);
 104
 105 typedef const struct vdev_ops {
 106         vdev_init_func_t                *vdev_op_init;
 107         vdev_fini_func_t                *vdev_op_fini;
 108         vdev_open_func_t                *vdev_op_open;
 109         vdev_close_func_t               *vdev_op_close;
 110         vdev_asize_func_t               *vdev_op_asize;
 111         vdev_min_asize_func_t           *vdev_op_min_asize;
 112         vdev_min_alloc_func_t           *vdev_op_min_alloc;
 113         vdev_io_start_func_t            *vdev_op_io_start;
 114         vdev_io_done_func_t             *vdev_op_io_done;
 115         vdev_state_change_func_t        *vdev_op_state_change;
 116         vdev_need_resilver_func_t       *vdev_op_need_resilver;
 117         vdev_hold_func_t                *vdev_op_hold;
 118         vdev_rele_func_t                *vdev_op_rele;
 119         vdev_remap_func_t               *vdev_op_remap;
 120         vdev_xlation_func_t             *vdev_op_xlate;
 121         vdev_rebuild_asize_func_t       *vdev_op_rebuild_asize;
 122         vdev_metaslab_init_func_t       *vdev_op_metaslab_init;
 123         vdev_config_generate_func_t     *vdev_op_config_generate;
 124         vdev_nparity_func_t             *vdev_op_nparity;
 125         vdev_ndisks_func_t              *vdev_op_ndisks;
 126         char                            vdev_op_type[16];
 127         boolean_t                       vdev_op_leaf;
 128 } vdev_ops_t;
 129
 130 /*
 131  * Virtual device properties
 132  */
 133 struct vdev_cache_entry {
 134         struct abd      *ve_abd;
 135         uint64_t        ve_offset;
 136         clock_t         ve_lastused;
 137         avl_node_t      ve_offset_node;
 138         avl_node_t      ve_lastused_node;
 139         uint32_t        ve_hits;
 140         uint16_t        ve_missed_update;
 141         zio_t           *ve_fill_io;
 142 };
 143
 144 struct vdev_cache {
 145         avl_tree_t      vc_offset_tree;
 146         avl_tree_t      vc_lastused_tree;
 147         kmutex_t        vc_lock;
 148 };
 149
 150 typedef struct vdev_queue_class {
 151         uint32_t        vqc_active;
 152
 153         /*
 154          * Sorted by offset or timestamp, depending on if the queue is
 155          * LBA-ordered vs FIFO.
 156          */
 157         avl_tree_t      vqc_queued_tree;
 158 } vdev_queue_class_t;
 159
 160 struct vdev_queue {
 161         vdev_t          *vq_vdev;
 162         vdev_queue_class_t vq_class[ZIO_PRIORITY_NUM_QUEUEABLE];
 163         avl_tree_t      vq_active_tree;
 164         avl_tree_t      vq_read_offset_tree;
 165         avl_tree_t      vq_write_offset_tree;
 166         avl_tree_t      vq_trim_offset_tree;
 167         uint64_t        vq_last_offset;
 168         zio_priority_t  vq_last_prio;   /* Last sent I/O priority. */
 169         uint32_t        vq_ia_active;   /* Active interactive I/Os. */
 170         uint32_t        vq_nia_credit;  /* Non-interactive I/Os credit. */
 171         hrtime_t        vq_io_complete_ts; /* time last i/o completed */
 172         hrtime_t        vq_io_delta_ts;
 173         zio_t           vq_io_search; /* used as local for stack reduction */
 174         kmutex_t        vq_lock;
 175 };
 176
 177 typedef enum vdev_alloc_bias {
 178         VDEV_BIAS_NONE,
 179         VDEV_BIAS_LOG,          /* dedicated to ZIL data (SLOG) */
 180         VDEV_BIAS_SPECIAL,      /* dedicated to ddt, metadata, and small blks */
 181         VDEV_BIAS_DEDUP         /* dedicated to dedup metadata */
 182 } vdev_alloc_bias_t;
 183
 184
 185 /*
 186  * On-disk indirect vdev state.
 187  *
 188  * An indirect vdev is described exclusively in the MOS config of a pool.
 189  * The config for an indirect vdev includes several fields, which are
 190  * accessed in memory by a vdev_indirect_config_t.
 191  */
 192 typedef struct vdev_indirect_config {
 193         /*
 194          * Object (in MOS) which contains the indirect mapping. This object
 195          * contains an array of vdev_indirect_mapping_entry_phys_t ordered by
 196          * vimep_src. The bonus buffer for this object is a
 197          * vdev_indirect_mapping_phys_t. This object is allocated when a vdev
 198          * removal is initiated.
 199          *
 200          * Note that this object can be empty if none of the data on the vdev
 201          * has been copied yet.
 202          */
 203         uint64_t        vic_mapping_object;
 204
 205         /*
 206          * Object (in MOS) which contains the birth times for the mapping
 207          * entries. This object contains an array of
 208          * vdev_indirect_birth_entry_phys_t sorted by vibe_offset. The bonus
 209          * buffer for this object is a vdev_indirect_birth_phys_t. This object
 210          * is allocated when a vdev removal is initiated.
 211          *
 212          * Note that this object can be empty if none of the vdev has yet been
 213          * copied.
 214          */
 215         uint64_t        vic_births_object;
 216
 217         /*
 218          * This is the vdev ID which was removed previous to this vdev, or
 219          * UINT64_MAX if there are no previously removed vdevs.
 220          */
 221         uint64_t        vic_prev_indirect_vdev;
 222 } vdev_indirect_config_t;
 223
 224 /*
 225  * Virtual device descriptor
 226  */
 227 struct vdev {
 228         /*
 229          * Common to all vdev types.
 230          */
 231         uint64_t        vdev_id;        /* child number in vdev parent  */
 232         uint64_t        vdev_guid;      /* unique ID for this vdev      */
 233         uint64_t        vdev_guid_sum;  /* self guid + all child guids  */
 234         uint64_t        vdev_orig_guid; /* orig. guid prior to remove   */
 235         uint64_t        vdev_asize;     /* allocatable device capacity  */
 236         uint64_t        vdev_min_asize; /* min acceptable asize         */
 237         uint64_t        vdev_max_asize; /* max acceptable asize         */
 238         uint64_t        vdev_ashift;    /* block alignment shift        */
 239
 240         /*
 241          * Logical block alignment shift
 242          *
 243          * The smallest sized/aligned I/O supported by the device.
 244          */
 245         uint64_t        vdev_logical_ashift;
 246         /*
 247          * Physical block alignment shift
 248          *
 249          * The device supports logical I/Os with vdev_logical_ashift
 250          * size/alignment, but optimum performance will be achieved by
 251          * aligning/sizing requests to vdev_physical_ashift.  Smaller
 252          * requests may be inflated or incur device level read-modify-write
 253          * operations.
 254          *
 255          * May be 0 to indicate no preference (i.e. use vdev_logical_ashift).
 256          */
 257         uint64_t        vdev_physical_ashift;
 258         uint64_t        vdev_state;     /* see VDEV_STATE_* #defines    */
 259         uint64_t        vdev_prevstate; /* used when reopening a vdev   */
 260         vdev_ops_t      *vdev_ops;      /* vdev operations              */
 261         spa_t           *vdev_spa;      /* spa for this vdev            */
 262         void            *vdev_tsd;      /* type-specific data           */
 263         vdev_t          *vdev_top;      /* top-level vdev               */
 264         vdev_t          *vdev_parent;   /* parent vdev                  */
 265         vdev_t          **vdev_child;   /* array of children            */
 266         uint64_t        vdev_children;  /* number of children           */
 267         vdev_stat_t     vdev_stat;      /* virtual device statistics    */
 268         vdev_stat_ex_t  vdev_stat_ex;   /* extended statistics          */
 269         boolean_t       vdev_expanding; /* expand the vdev?             */
 270         boolean_t       vdev_reopening; /* reopen in progress?          */
 271         boolean_t       vdev_nonrot;    /* true if solid state          */
 272         int             vdev_load_error; /* error on last load          */
 273         int             vdev_open_error; /* error on last open          */
 274         int             vdev_validate_error; /* error on last validate  */
 275         kthread_t       *vdev_open_thread; /* thread opening children   */
 276         kthread_t       *vdev_validate_thread; /* thread validating children */
 277         uint64_t        vdev_crtxg;     /* txg when top-level was added */
 278
 279         /*
 280          * Top-level vdev state.
 281          */
 282         uint64_t        vdev_ms_array;  /* metaslab array object        */
 283         uint64_t        vdev_ms_shift;  /* metaslab size shift          */
 284         uint64_t        vdev_ms_count;  /* number of metaslabs          */
 285         metaslab_group_t *vdev_mg;      /* metaslab group               */
 286         metaslab_group_t *vdev_log_mg;  /* embedded slog metaslab group */
 287         metaslab_t      **vdev_ms;      /* metaslab array               */
 288         uint64_t        vdev_pending_fastwrite; /* allocated fastwrites */
 289         txg_list_t      vdev_ms_list;   /* per-txg dirty metaslab lists */
 290         txg_list_t      vdev_dtl_list;  /* per-txg dirty DTL lists      */
 291         txg_node_t      vdev_txg_node;  /* per-txg dirty vdev linkage   */
 292         boolean_t       vdev_remove_wanted; /* async remove wanted?     */
 293         boolean_t       vdev_probe_wanted; /* async probe wanted?       */
 294         list_node_t     vdev_config_dirty_node; /* config dirty list    */
 295         list_node_t     vdev_state_dirty_node; /* state dirty list      */
 296         uint64_t        vdev_deflate_ratio; /* deflation ratio (x512)   */
 297         uint64_t        vdev_islog;     /* is an intent log device      */
 298         uint64_t        vdev_noalloc;   /* device is passivated?        */
 299         uint64_t        vdev_removing;  /* device is being removed?     */
 300         boolean_t       vdev_ishole;    /* is a hole in the namespace   */
 301         uint64_t        vdev_top_zap;
 302         vdev_alloc_bias_t vdev_alloc_bias; /* metaslab allocation bias  */
 303
 304         /* pool checkpoint related */
 305         space_map_t     *vdev_checkpoint_sm;    /* contains reserved blocks */
 306
 307         /* Initialize related */
 308         boolean_t       vdev_initialize_exit_wanted;
 309         vdev_initializing_state_t       vdev_initialize_state;
 310         list_node_t     vdev_initialize_node;
 311         kthread_t       *vdev_initialize_thread;
 312         /* Protects vdev_initialize_thread and vdev_initialize_state. */
 313         kmutex_t        vdev_initialize_lock;
 314         kcondvar_t      vdev_initialize_cv;
 315         uint64_t        vdev_initialize_offset[TXG_SIZE];
 316         uint64_t        vdev_initialize_last_offset;
 317         range_tree_t    *vdev_initialize_tree;  /* valid while initializing */
 318         uint64_t        vdev_initialize_bytes_est;
 319         uint64_t        vdev_initialize_bytes_done;
 320         uint64_t        vdev_initialize_action_time;    /* start and end time */
 321
 322         /* TRIM related */
 323         boolean_t       vdev_trim_exit_wanted;
 324         boolean_t       vdev_autotrim_exit_wanted;
 325         vdev_trim_state_t       vdev_trim_state;
 326         list_node_t     vdev_trim_node;
 327         kmutex_t        vdev_autotrim_lock;
 328         kcondvar_t      vdev_autotrim_cv;
 329         kthread_t       *vdev_autotrim_thread;
 330         /* Protects vdev_trim_thread and vdev_trim_state. */
 331         kmutex_t        vdev_trim_lock;
 332         kcondvar_t      vdev_trim_cv;
 333         kthread_t       *vdev_trim_thread;
 334         uint64_t        vdev_trim_offset[TXG_SIZE];
 335         uint64_t        vdev_trim_last_offset;
 336         uint64_t        vdev_trim_bytes_est;
 337         uint64_t        vdev_trim_bytes_done;
 338         uint64_t        vdev_trim_rate;         /* requested rate (bytes/sec) */
 339         uint64_t        vdev_trim_partial;      /* requested partial TRIM */
 340         uint64_t        vdev_trim_secure;       /* requested secure TRIM */
 341         uint64_t        vdev_trim_action_time;  /* start and end time */
 342
 343         /* Rebuild related */
 344         boolean_t       vdev_rebuilding;
 345         boolean_t       vdev_rebuild_exit_wanted;
 346         boolean_t       vdev_rebuild_cancel_wanted;
 347         boolean_t       vdev_rebuild_reset_wanted;
 348         kmutex_t        vdev_rebuild_lock;
 349         kcondvar_t      vdev_rebuild_cv;
 350         kthread_t       *vdev_rebuild_thread;
 351         vdev_rebuild_t  vdev_rebuild_config;
 352
 353         /* For limiting outstanding I/Os (initialize, TRIM) */
 354         kmutex_t        vdev_initialize_io_lock;
 355         kcondvar_t      vdev_initialize_io_cv;
 356         uint64_t        vdev_initialize_inflight;
 357         kmutex_t        vdev_trim_io_lock;
 358         kcondvar_t      vdev_trim_io_cv;
 359         uint64_t        vdev_trim_inflight[3];
 360
 361         /*
 362          * Values stored in the config for an indirect or removing vdev.
 363          */
 364         vdev_indirect_config_t  vdev_indirect_config;
 365
 366         /*
 367          * The vdev_indirect_rwlock protects the vdev_indirect_mapping
 368          * pointer from changing on indirect vdevs (when it is condensed).
 369          * Note that removing (not yet indirect) vdevs have different
 370          * access patterns (the mapping is not accessed from open context,
 371          * e.g. from zio_read) and locking strategy (e.g. svr_lock).
 372          */
 373         krwlock_t vdev_indirect_rwlock;
 374         vdev_indirect_mapping_t *vdev_indirect_mapping;
 375         vdev_indirect_births_t *vdev_indirect_births;
 376
 377         /*
 378          * In memory data structures used to manage the obsolete sm, for
 379          * indirect or removing vdevs.
 380          *
 381          * The vdev_obsolete_segments is the in-core record of the segments
 382          * that are no longer referenced anywhere in the pool (due to
 383          * being freed or remapped and not referenced by any snapshots).
 384          * During a sync, segments are added to vdev_obsolete_segments
 385          * via vdev_indirect_mark_obsolete(); at the end of each sync
 386          * pass, this is appended to vdev_obsolete_sm via
 387          * vdev_indirect_sync_obsolete().  The vdev_obsolete_lock
 388          * protects against concurrent modifications of vdev_obsolete_segments
 389          * from multiple zio threads.
 390          */
 391         kmutex_t        vdev_obsolete_lock;
 392         range_tree_t    *vdev_obsolete_segments;
 393         space_map_t     *vdev_obsolete_sm;
 394
 395         /*
 396          * Protects the vdev_scan_io_queue field itself as well as the
 397          * structure's contents (when present).
 398          */
 399         kmutex_t                        vdev_scan_io_queue_lock;
 400         struct dsl_scan_io_queue        *vdev_scan_io_queue;
 401
 402         /*
 403          * Leaf vdev state.
 404          */
 405         range_tree_t    *vdev_dtl[DTL_TYPES]; /* dirty time logs        */
 406         space_map_t     *vdev_dtl_sm;   /* dirty time log space map     */
 407         txg_node_t      vdev_dtl_node;  /* per-txg dirty DTL linkage    */
 408         uint64_t        vdev_dtl_object; /* DTL object                  */
 409         uint64_t        vdev_psize;     /* physical device capacity     */
 410         uint64_t        vdev_wholedisk; /* true if this is a whole disk */
 411         uint64_t        vdev_offline;   /* persistent offline state     */
 412         uint64_t        vdev_faulted;   /* persistent faulted state     */
 413         uint64_t        vdev_degraded;  /* persistent degraded state    */
 414         uint64_t        vdev_removed;   /* persistent removed state     */
 415         uint64_t        vdev_resilver_txg; /* persistent resilvering state */
 416         uint64_t        vdev_rebuild_txg; /* persistent rebuilding state */
 417         char            *vdev_path;     /* vdev path (if any)           */
 418         char            *vdev_devid;    /* vdev devid (if any)          */
 419         char            *vdev_physpath; /* vdev device path (if any)    */
 420         char            *vdev_enc_sysfs_path;   /* enclosure sysfs path */
 421         char            *vdev_fru;      /* physical FRU location        */
 422         uint64_t        vdev_not_present; /* not present during import  */
 423         uint64_t        vdev_unspare;   /* unspare when resilvering done */
 424         boolean_t       vdev_nowritecache; /* true if flushwritecache failed */
 425         boolean_t       vdev_has_trim;  /* TRIM is supported            */
 426         boolean_t       vdev_has_securetrim; /* secure TRIM is supported */
 427         boolean_t       vdev_checkremove; /* temporary online test      */
 428         boolean_t       vdev_forcefault; /* force online fault          */
 429         boolean_t       vdev_splitting; /* split or repair in progress  */
 430         boolean_t       vdev_delayed_close; /* delayed device close?    */
 431         boolean_t       vdev_tmpoffline; /* device taken offline temporarily? */
 432         boolean_t       vdev_detached;  /* device detached?             */
 433         boolean_t       vdev_cant_read; /* vdev is failing all reads    */
 434         boolean_t       vdev_cant_write; /* vdev is failing all writes  */
 435         boolean_t       vdev_isspare;   /* was a hot spare              */
 436         boolean_t       vdev_isl2cache; /* was a l2cache device         */
 437         boolean_t       vdev_copy_uberblocks;  /* post expand copy uberblocks */
 438         boolean_t       vdev_resilver_deferred;  /* resilver deferred */
 439         vdev_queue_t    vdev_queue;     /* I/O deadline schedule queue  */
 440         vdev_cache_t    vdev_cache;     /* physical block cache         */
 441         spa_aux_vdev_t  *vdev_aux;      /* for l2cache and spares vdevs */
 442         zio_t           *vdev_probe_zio; /* root of current probe       */
 443         vdev_aux_t      vdev_label_aux; /* on-disk aux state            */
 444         uint64_t        vdev_leaf_zap;
 445         hrtime_t        vdev_mmp_pending; /* 0 if write finished        */
 446         uint64_t        vdev_mmp_kstat_id;      /* to find kstat entry */
 447         uint64_t        vdev_expansion_time;    /* vdev's last expansion time */
 448         list_node_t     vdev_leaf_node;         /* leaf vdev list */
 449
 450         /*
 451          * For DTrace to work in userland (libzpool) context, these fields must
 452          * remain at the end of the structure.  DTrace will use the kernel's
 453          * CTF definition for 'struct vdev', and since the size of a kmutex_t is
 454          * larger in userland, the offsets for the rest of the fields would be
 455          * incorrect.
 456          */
 457         kmutex_t        vdev_dtl_lock;  /* vdev_dtl_{map,resilver}      */
 458         kmutex_t        vdev_stat_lock; /* vdev_stat                    */
 459         kmutex_t        vdev_probe_lock; /* protects vdev_probe_zio     */
 460
 461         /*
 462          * We rate limit ZIO delay, deadman, and checksum events, since they
 463          * can flood ZED with tons of events when a drive is acting up.
 464          */
 465         zfs_ratelimit_t vdev_delay_rl;
 466         zfs_ratelimit_t vdev_deadman_rl;
 467         zfs_ratelimit_t vdev_checksum_rl;
 468 };
 469
 470 #define VDEV_PAD_SIZE           (8 << 10)
 471 /* 2 padding areas (vl_pad1 and vl_be) to skip */
 472 #define VDEV_SKIP_SIZE          VDEV_PAD_SIZE * 2
 473 #define VDEV_PHYS_SIZE          (112 << 10)
 474 #define VDEV_UBERBLOCK_RING     (128 << 10)
 475
 476 /*
 477  * MMP blocks occupy the last MMP_BLOCKS_PER_LABEL slots in the uberblock
 478  * ring when MMP is enabled.
 479  */
 480 #define MMP_BLOCKS_PER_LABEL    1
 481
 482 /* The largest uberblock we support is 8k. */
 483 #define MAX_UBERBLOCK_SHIFT (13)
 484 #define VDEV_UBERBLOCK_SHIFT(vd)        \
 485         MIN(MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT), \
 486             MAX_UBERBLOCK_SHIFT)
 487 #define VDEV_UBERBLOCK_COUNT(vd)        \
 488         (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd))
 489 #define VDEV_UBERBLOCK_OFFSET(vd, n)    \
 490         offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)])
 491 #define VDEV_UBERBLOCK_SIZE(vd)         (1ULL << VDEV_UBERBLOCK_SHIFT(vd))
 492
 493 typedef struct vdev_phys {
 494         char            vp_nvlist[VDEV_PHYS_SIZE - sizeof (zio_eck_t)];
 495         zio_eck_t       vp_zbt;
 496 } vdev_phys_t;
 497
 498 typedef enum vbe_vers {
 499         /*
 500          * The bootenv file is stored as ascii text in the envblock.
 501          * It is used by the GRUB bootloader used on Linux to store the
 502          * contents of the grubenv file. The file is stored as raw ASCII,
 503          * and is protected by an embedded checksum. By default, GRUB will
 504          * check if the boot filesystem supports storing the environment data
 505          * in a special location, and if so, will invoke filesystem specific
 506          * logic to retrieve it. This can be overridden by a variable, should
 507          * the user so desire.
 508          */
 509         VB_RAW = 0,
 510
 511         /*
 512          * The bootenv file is converted to an nvlist and then packed into the
 513          * envblock.
 514          */
 515         VB_NVLIST = 1
 516 } vbe_vers_t;
 517
 518 typedef struct vdev_boot_envblock {
 519         uint64_t        vbe_version;
 520         char            vbe_bootenv[VDEV_PAD_SIZE - sizeof (uint64_t) -
 521                         sizeof (zio_eck_t)];
 522         zio_eck_t       vbe_zbt;
 523 } vdev_boot_envblock_t;
 524 _Static_assert(sizeof (vdev_boot_envblock_t) == VDEV_PAD_SIZE,
 525         "vdev_boot_envblock_t wrong size");
 526
 527 typedef struct vdev_label {
 528         char            vl_pad1[VDEV_PAD_SIZE];                 /*  8K */
 529         vdev_boot_envblock_t    vl_be;                          /*  8K */
 530         vdev_phys_t     vl_vdev_phys;                           /* 112K */
 531         char            vl_uberblock[VDEV_UBERBLOCK_RING];      /* 128K */
 532 } vdev_label_t;                                         /* 256K total */
 533
 534 /*
 535  * vdev_dirty() flags
 536  */
 537 #define VDD_METASLAB    0x01
 538 #define VDD_DTL         0x02
 539
 540 /* Offset of embedded boot loader region on each label */
 541 #define VDEV_BOOT_OFFSET        (2 * sizeof (vdev_label_t))
 542 /*
 543  * Size of embedded boot loader region on each label.
 544  * The total size of the first two labels plus the boot area is 4MB.
 545  */
 546 #define VDEV_BOOT_SIZE          (7ULL << 19)                    /* 3.5M */
 547
 548 /*
 549  * Size of label regions at the start and end of each leaf device.
 550  */
 551 #define VDEV_LABEL_START_SIZE   (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE)
 552 #define VDEV_LABEL_END_SIZE     (2 * sizeof (vdev_label_t))
 553 #define VDEV_LABELS             4
 554 #define VDEV_BEST_LABEL         VDEV_LABELS
 555 #define VDEV_OFFSET_IS_LABEL(vd, off)                           \
 556         (((off) < VDEV_LABEL_START_SIZE) ||                     \
 557         ((off) >= ((vd)->vdev_psize - VDEV_LABEL_END_SIZE)))
 558
 559 #define VDEV_ALLOC_LOAD         0
 560 #define VDEV_ALLOC_ADD          1
 561 #define VDEV_ALLOC_SPARE        2
 562 #define VDEV_ALLOC_L2CACHE      3
 563 #define VDEV_ALLOC_ROOTPOOL     4
 564 #define VDEV_ALLOC_SPLIT        5
 565 #define VDEV_ALLOC_ATTACH       6
 566
 567 /*
 568  * Allocate or free a vdev
 569  */
 570 extern vdev_t *vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid,
 571     vdev_ops_t *ops);
 572 extern int vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *config,
 573     vdev_t *parent, uint_t id, int alloctype);
 574 extern void vdev_free(vdev_t *vd);
 575
 576 /*
 577  * Add or remove children and parents
 578  */
 579 extern void vdev_add_child(vdev_t *pvd, vdev_t *cvd);
 580 extern void vdev_remove_child(vdev_t *pvd, vdev_t *cvd);
 581 extern void vdev_compact_children(vdev_t *pvd);
 582 extern vdev_t *vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops);
 583 extern void vdev_remove_parent(vdev_t *cvd);
 584
 585 /*
 586  * vdev sync load and sync
 587  */
 588 extern boolean_t vdev_log_state_valid(vdev_t *vd);
 589 extern int vdev_load(vdev_t *vd);
 590 extern int vdev_dtl_load(vdev_t *vd);
 591 extern void vdev_sync(vdev_t *vd, uint64_t txg);
 592 extern void vdev_sync_done(vdev_t *vd, uint64_t txg);
 593 extern void vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg);
 594 extern void vdev_dirty_leaves(vdev_t *vd, int flags, uint64_t txg);
 595
 596 /*
 597  * Available vdev types.
 598  */
 599 extern vdev_ops_t vdev_root_ops;
 600 extern vdev_ops_t vdev_mirror_ops;
 601 extern vdev_ops_t vdev_replacing_ops;
 602 extern vdev_ops_t vdev_raidz_ops;
 603 extern vdev_ops_t vdev_draid_ops;
 604 extern vdev_ops_t vdev_draid_spare_ops;
 605 extern vdev_ops_t vdev_disk_ops;
 606 extern vdev_ops_t vdev_file_ops;
 607 extern vdev_ops_t vdev_missing_ops;
 608 extern vdev_ops_t vdev_hole_ops;
 609 extern vdev_ops_t vdev_spare_ops;
 610 extern vdev_ops_t vdev_indirect_ops;
 611
 612 /*
 613  * Common size functions
 614  */
 615 extern void vdev_default_xlate(vdev_t *vd, const range_seg64_t *logical_rs,
 616     range_seg64_t *physical_rs, range_seg64_t *remain_rs);
 617 extern uint64_t vdev_default_asize(vdev_t *vd, uint64_t psize);
 618 extern uint64_t vdev_default_min_asize(vdev_t *vd);
 619 extern uint64_t vdev_get_min_asize(vdev_t *vd);
 620 extern void vdev_set_min_asize(vdev_t *vd);
 621 extern uint64_t vdev_get_min_alloc(vdev_t *vd);
 622 extern uint64_t vdev_get_nparity(vdev_t *vd);
 623 extern uint64_t vdev_get_ndisks(vdev_t *vd);
 624
 625 /*
 626  * Global variables
 627  */
 628 extern int zfs_vdev_standard_sm_blksz;
 629
 630 /*
 631  * Functions from vdev_indirect.c
 632  */
 633 extern void vdev_indirect_sync_obsolete(vdev_t *vd, dmu_tx_t *tx);
 634 extern boolean_t vdev_indirect_should_condense(vdev_t *vd);
 635 extern void spa_condense_indirect_start_sync(vdev_t *vd, dmu_tx_t *tx);
 636 extern int vdev_obsolete_sm_object(vdev_t *vd, uint64_t *sm_obj);
 637 extern int vdev_obsolete_counts_are_precise(vdev_t *vd, boolean_t *are_precise);
 638
 639 /*
 640  * Other miscellaneous functions
 641  */
 642 int vdev_checkpoint_sm_object(vdev_t *vd, uint64_t *sm_obj);
 643 void vdev_metaslab_group_create(vdev_t *vd);
 644 uint64_t vdev_best_ashift(uint64_t logical, uint64_t a, uint64_t b);
 645
 646 /*
 647  * Vdev ashift optimization tunables
 648  */
 649 extern uint64_t zfs_vdev_min_auto_ashift;
 650 extern uint64_t zfs_vdev_max_auto_ashift;
 651 int param_set_min_auto_ashift(ZFS_MODULE_PARAM_ARGS);
 652 int param_set_max_auto_ashift(ZFS_MODULE_PARAM_ARGS);
 653
 654 #ifdef  __cplusplus
 655 }
 656 #endif
 657
 658 #endif  /* _SYS_VDEV_IMPL_H */