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.
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.
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]
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.
27 #ifndef _SYS_VDEV_IMPL_H
28 #define _SYS_VDEV_IMPL_H
31 #include <sys/bpobj.h>
33 #include <sys/metaslab.h>
34 #include <sys/nvpair.h>
35 #include <sys/space_map.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>
49 * Virtual device descriptors.
51 * All storage pool operations go through the virtual device framework,
52 * which provides data replication and I/O scheduling.
56 * Forward declarations that lots of things need.
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
;
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
;
68 * Virtual device operations
70 typedef int vdev_open_func_t(vdev_t
*vd
, uint64_t *size
, uint64_t *max_size
,
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
);
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
);
86 * Given a target vdev, translates the logical range "in" to the physical
89 typedef void vdev_xlation_func_t(vdev_t
*cvd
, const range_seg_t
*in
,
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
;
104 * For translating ranges from non-leaf vdevs (e.g. raidz) to leaves.
105 * Used when initializing vdevs. Isn't used by leaf ops.
107 vdev_xlation_func_t
*vdev_op_xlate
;
108 char vdev_op_type
[16];
109 boolean_t vdev_op_leaf
;
113 * Virtual device properties
115 struct vdev_cache_entry
{
119 avl_node_t ve_offset_node
;
120 avl_node_t ve_lastused_node
;
122 uint16_t ve_missed_update
;
127 avl_tree_t vc_offset_tree
;
128 avl_tree_t vc_lastused_tree
;
132 typedef struct vdev_queue_class
{
136 * Sorted by offset or timestamp, depending on if the queue is
137 * LBA-ordered vs FIFO.
139 avl_tree_t vqc_queued_tree
;
140 } vdev_queue_class_t
;
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 */
155 typedef enum vdev_alloc_bias
{
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 */
164 * On-disk indirect vdev state.
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.
170 typedef struct vdev_indirect_config
{
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.
178 * Note that this object can be empty if none of the data on the vdev
179 * has been copied yet.
181 uint64_t vic_mapping_object
;
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.
190 * Note that this object can be empty if none of the vdev has yet been
193 uint64_t vic_births_object
;
196 * This is the vdev ID which was removed previous to this vdev, or
197 * UINT64_MAX if there are no previously removed vdevs.
199 uint64_t vic_prev_indirect_vdev
;
200 } vdev_indirect_config_t
;
203 * Virtual device descriptor
207 * Common to all vdev types.
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 */
238 * Top-level vdev state.
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 kmutex_t vdev_queue_lock
; /* protects vdev_queue_depth */
258 uint64_t vdev_top_zap
;
259 vdev_alloc_bias_t vdev_alloc_bias
; /* metaslab allocation bias */
261 /* pool checkpoint related */
262 space_map_t
*vdev_checkpoint_sm
; /* contains reserved blocks */
264 boolean_t vdev_initialize_exit_wanted
;
265 vdev_initializing_state_t vdev_initialize_state
;
266 list_node_t vdev_initialize_node
;
267 kthread_t
*vdev_initialize_thread
;
268 /* Protects vdev_initialize_thread and vdev_initialize_state. */
269 kmutex_t vdev_initialize_lock
;
270 kcondvar_t vdev_initialize_cv
;
271 uint64_t vdev_initialize_offset
[TXG_SIZE
];
272 uint64_t vdev_initialize_last_offset
;
273 range_tree_t
*vdev_initialize_tree
; /* valid while initializing */
274 uint64_t vdev_initialize_bytes_est
;
275 uint64_t vdev_initialize_bytes_done
;
276 time_t vdev_initialize_action_time
; /* start and end time */
278 /* for limiting outstanding I/Os */
279 kmutex_t vdev_initialize_io_lock
;
280 kcondvar_t vdev_initialize_io_cv
;
281 uint64_t vdev_initialize_inflight
;
284 * Values stored in the config for an indirect or removing vdev.
286 vdev_indirect_config_t vdev_indirect_config
;
289 * The vdev_indirect_rwlock protects the vdev_indirect_mapping
290 * pointer from changing on indirect vdevs (when it is condensed).
291 * Note that removing (not yet indirect) vdevs have different
292 * access patterns (the mapping is not accessed from open context,
293 * e.g. from zio_read) and locking strategy (e.g. svr_lock).
295 krwlock_t vdev_indirect_rwlock
;
296 vdev_indirect_mapping_t
*vdev_indirect_mapping
;
297 vdev_indirect_births_t
*vdev_indirect_births
;
300 * In memory data structures used to manage the obsolete sm, for
301 * indirect or removing vdevs.
303 * The vdev_obsolete_segments is the in-core record of the segments
304 * that are no longer referenced anywhere in the pool (due to
305 * being freed or remapped and not referenced by any snapshots).
306 * During a sync, segments are added to vdev_obsolete_segments
307 * via vdev_indirect_mark_obsolete(); at the end of each sync
308 * pass, this is appended to vdev_obsolete_sm via
309 * vdev_indirect_sync_obsolete(). The vdev_obsolete_lock
310 * protects against concurrent modifications of vdev_obsolete_segments
311 * from multiple zio threads.
313 kmutex_t vdev_obsolete_lock
;
314 range_tree_t
*vdev_obsolete_segments
;
315 space_map_t
*vdev_obsolete_sm
;
318 * The queue depth parameters determine how many async writes are
319 * still pending (i.e. allocated but not yet issued to disk) per
320 * top-level (vdev_async_write_queue_depth) and the maximum allowed
321 * (vdev_max_async_write_queue_depth). These values only apply to
324 uint64_t vdev_async_write_queue_depth
;
325 uint64_t vdev_max_async_write_queue_depth
;
328 * Protects the vdev_scan_io_queue field itself as well as the
329 * structure's contents (when present).
331 kmutex_t vdev_scan_io_queue_lock
;
332 struct dsl_scan_io_queue
*vdev_scan_io_queue
;
337 range_tree_t
*vdev_dtl
[DTL_TYPES
]; /* dirty time logs */
338 space_map_t
*vdev_dtl_sm
; /* dirty time log space map */
339 txg_node_t vdev_dtl_node
; /* per-txg dirty DTL linkage */
340 uint64_t vdev_dtl_object
; /* DTL object */
341 uint64_t vdev_psize
; /* physical device capacity */
342 uint64_t vdev_wholedisk
; /* true if this is a whole disk */
343 uint64_t vdev_offline
; /* persistent offline state */
344 uint64_t vdev_faulted
; /* persistent faulted state */
345 uint64_t vdev_degraded
; /* persistent degraded state */
346 uint64_t vdev_removed
; /* persistent removed state */
347 uint64_t vdev_resilver_txg
; /* persistent resilvering state */
348 uint64_t vdev_nparity
; /* number of parity devices for raidz */
349 char *vdev_path
; /* vdev path (if any) */
350 char *vdev_devid
; /* vdev devid (if any) */
351 char *vdev_physpath
; /* vdev device path (if any) */
352 char *vdev_enc_sysfs_path
; /* enclosure sysfs path */
353 char *vdev_fru
; /* physical FRU location */
354 uint64_t vdev_not_present
; /* not present during import */
355 uint64_t vdev_unspare
; /* unspare when resilvering done */
356 boolean_t vdev_nowritecache
; /* true if flushwritecache failed */
357 boolean_t vdev_checkremove
; /* temporary online test */
358 boolean_t vdev_forcefault
; /* force online fault */
359 boolean_t vdev_splitting
; /* split or repair in progress */
360 boolean_t vdev_delayed_close
; /* delayed device close? */
361 boolean_t vdev_tmpoffline
; /* device taken offline temporarily? */
362 boolean_t vdev_detached
; /* device detached? */
363 boolean_t vdev_cant_read
; /* vdev is failing all reads */
364 boolean_t vdev_cant_write
; /* vdev is failing all writes */
365 boolean_t vdev_isspare
; /* was a hot spare */
366 boolean_t vdev_isl2cache
; /* was a l2cache device */
367 boolean_t vdev_copy_uberblocks
; /* post expand copy uberblocks */
368 boolean_t vdev_resilver_deferred
; /* resilver deferred */
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 uint64_t vdev_leaf_zap
;
375 hrtime_t vdev_mmp_pending
; /* 0 if write finished */
376 uint64_t vdev_mmp_kstat_id
; /* to find kstat entry */
377 uint64_t vdev_expansion_time
; /* vdev's last expansion time */
380 * For DTrace to work in userland (libzpool) context, these fields must
381 * remain at the end of the structure. DTrace will use the kernel's
382 * CTF definition for 'struct vdev', and since the size of a kmutex_t is
383 * larger in userland, the offsets for the rest of the fields would be
386 kmutex_t vdev_dtl_lock
; /* vdev_dtl_{map,resilver} */
387 kmutex_t vdev_stat_lock
; /* vdev_stat */
388 kmutex_t vdev_probe_lock
; /* protects vdev_probe_zio */
391 * We rate limit ZIO delay and ZIO checksum events, since they
392 * can flood ZED with tons of events when a drive is acting up.
394 zfs_ratelimit_t vdev_delay_rl
;
395 zfs_ratelimit_t vdev_checksum_rl
;
398 #define VDEV_RAIDZ_MAXPARITY 3
400 #define VDEV_PAD_SIZE (8 << 10)
401 /* 2 padding areas (vl_pad1 and vl_pad2) to skip */
402 #define VDEV_SKIP_SIZE VDEV_PAD_SIZE * 2
403 #define VDEV_PHYS_SIZE (112 << 10)
404 #define VDEV_UBERBLOCK_RING (128 << 10)
407 * MMP blocks occupy the last MMP_BLOCKS_PER_LABEL slots in the uberblock
408 * ring when MMP is enabled.
410 #define MMP_BLOCKS_PER_LABEL 1
412 /* The largest uberblock we support is 8k. */
413 #define MAX_UBERBLOCK_SHIFT (13)
414 #define VDEV_UBERBLOCK_SHIFT(vd) \
415 MIN(MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT), \
417 #define VDEV_UBERBLOCK_COUNT(vd) \
418 (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd))
419 #define VDEV_UBERBLOCK_OFFSET(vd, n) \
420 offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)])
421 #define VDEV_UBERBLOCK_SIZE(vd) (1ULL << VDEV_UBERBLOCK_SHIFT(vd))
423 typedef struct vdev_phys
{
424 char vp_nvlist
[VDEV_PHYS_SIZE
- sizeof (zio_eck_t
)];
428 typedef struct vdev_label
{
429 char vl_pad1
[VDEV_PAD_SIZE
]; /* 8K */
430 char vl_pad2
[VDEV_PAD_SIZE
]; /* 8K */
431 vdev_phys_t vl_vdev_phys
; /* 112K */
432 char vl_uberblock
[VDEV_UBERBLOCK_RING
]; /* 128K */
433 } vdev_label_t
; /* 256K total */
438 #define VDD_METASLAB 0x01
441 /* Offset of embedded boot loader region on each label */
442 #define VDEV_BOOT_OFFSET (2 * sizeof (vdev_label_t))
444 * Size of embedded boot loader region on each label.
445 * The total size of the first two labels plus the boot area is 4MB.
447 #define VDEV_BOOT_SIZE (7ULL << 19) /* 3.5M */
450 * Size of label regions at the start and end of each leaf device.
452 #define VDEV_LABEL_START_SIZE (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE)
453 #define VDEV_LABEL_END_SIZE (2 * sizeof (vdev_label_t))
454 #define VDEV_LABELS 4
455 #define VDEV_BEST_LABEL VDEV_LABELS
457 #define VDEV_ALLOC_LOAD 0
458 #define VDEV_ALLOC_ADD 1
459 #define VDEV_ALLOC_SPARE 2
460 #define VDEV_ALLOC_L2CACHE 3
461 #define VDEV_ALLOC_ROOTPOOL 4
462 #define VDEV_ALLOC_SPLIT 5
463 #define VDEV_ALLOC_ATTACH 6
466 * Allocate or free a vdev
468 extern vdev_t
*vdev_alloc_common(spa_t
*spa
, uint_t id
, uint64_t guid
,
470 extern int vdev_alloc(spa_t
*spa
, vdev_t
**vdp
, nvlist_t
*config
,
471 vdev_t
*parent
, uint_t id
, int alloctype
);
472 extern void vdev_free(vdev_t
*vd
);
475 * Add or remove children and parents
477 extern void vdev_add_child(vdev_t
*pvd
, vdev_t
*cvd
);
478 extern void vdev_remove_child(vdev_t
*pvd
, vdev_t
*cvd
);
479 extern void vdev_compact_children(vdev_t
*pvd
);
480 extern vdev_t
*vdev_add_parent(vdev_t
*cvd
, vdev_ops_t
*ops
);
481 extern void vdev_remove_parent(vdev_t
*cvd
);
484 * vdev sync load and sync
486 extern boolean_t
vdev_log_state_valid(vdev_t
*vd
);
487 extern int vdev_load(vdev_t
*vd
);
488 extern int vdev_dtl_load(vdev_t
*vd
);
489 extern void vdev_sync(vdev_t
*vd
, uint64_t txg
);
490 extern void vdev_sync_done(vdev_t
*vd
, uint64_t txg
);
491 extern void vdev_dirty(vdev_t
*vd
, int flags
, void *arg
, uint64_t txg
);
492 extern void vdev_dirty_leaves(vdev_t
*vd
, int flags
, uint64_t txg
);
495 * Available vdev types.
497 extern vdev_ops_t vdev_root_ops
;
498 extern vdev_ops_t vdev_mirror_ops
;
499 extern vdev_ops_t vdev_replacing_ops
;
500 extern vdev_ops_t vdev_raidz_ops
;
501 extern vdev_ops_t vdev_disk_ops
;
502 extern vdev_ops_t vdev_file_ops
;
503 extern vdev_ops_t vdev_missing_ops
;
504 extern vdev_ops_t vdev_hole_ops
;
505 extern vdev_ops_t vdev_spare_ops
;
506 extern vdev_ops_t vdev_indirect_ops
;
509 * Common size functions
511 extern void vdev_default_xlate(vdev_t
*vd
, const range_seg_t
*in
,
513 extern uint64_t vdev_default_asize(vdev_t
*vd
, uint64_t psize
);
514 extern uint64_t vdev_get_min_asize(vdev_t
*vd
);
515 extern void vdev_set_min_asize(vdev_t
*vd
);
520 extern int vdev_standard_sm_blksz
;
521 /* zdb uses this tunable, so it must be declared here to make lint happy. */
522 extern int zfs_vdev_cache_size
;
525 * Functions from vdev_indirect.c
527 extern void vdev_indirect_sync_obsolete(vdev_t
*vd
, dmu_tx_t
*tx
);
528 extern boolean_t
vdev_indirect_should_condense(vdev_t
*vd
);
529 extern void spa_condense_indirect_start_sync(vdev_t
*vd
, dmu_tx_t
*tx
);
530 extern int vdev_obsolete_sm_object(vdev_t
*vd
, uint64_t *sm_obj
);
531 extern int vdev_obsolete_counts_are_precise(vdev_t
*vd
, boolean_t
*are_precise
);
534 * Other miscellaneous functions
536 int vdev_checkpoint_sm_object(vdev_t
*vd
, uint64_t *sm_obj
);
542 #endif /* _SYS_VDEV_IMPL_H */