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
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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) 2013 by Delphix. All rights reserved.
26 #ifndef _SYS_VDEV_IMPL_H
27 #define _SYS_VDEV_IMPL_H
31 #include <sys/metaslab.h>
32 #include <sys/nvpair.h>
33 #include <sys/space_map.h>
36 #include <sys/uberblock_impl.h>
43 * Virtual device descriptors.
45 * All storage pool operations go through the virtual device framework,
46 * which provides data replication and I/O scheduling.
50 * Forward declarations that lots of things need.
52 typedef struct vdev_queue vdev_queue_t;
53 typedef struct vdev_cache vdev_cache_t;
54 typedef struct vdev_cache_entry vdev_cache_entry_t;
57 * Virtual device operations
59 typedef int vdev_open_func_t(vdev_t *vd, uint64_t *size, uint64_t *max_size,
60 uint64_t *logical_ashift, uint64_t *physical_ashift);
61 typedef void vdev_close_func_t(vdev_t *vd);
62 typedef uint64_t vdev_asize_func_t(vdev_t *vd, uint64_t psize);
63 typedef int vdev_io_start_func_t(zio_t *zio);
64 typedef void vdev_io_done_func_t(zio_t *zio);
65 typedef void vdev_state_change_func_t(vdev_t *vd, int, int);
66 typedef void vdev_hold_func_t(vdev_t *vd);
67 typedef void vdev_rele_func_t(vdev_t *vd);
69 typedef struct vdev_ops {
70 vdev_open_func_t *vdev_op_open;
71 vdev_close_func_t *vdev_op_close;
72 vdev_asize_func_t *vdev_op_asize;
73 vdev_io_start_func_t *vdev_op_io_start;
74 vdev_io_done_func_t *vdev_op_io_done;
75 vdev_state_change_func_t *vdev_op_state_change;
76 vdev_hold_func_t *vdev_op_hold;
77 vdev_rele_func_t *vdev_op_rele;
78 char vdev_op_type[16];
79 boolean_t vdev_op_leaf;
83 * Virtual device properties
85 struct vdev_cache_entry {
89 avl_node_t ve_offset_node;
90 avl_node_t ve_lastused_node;
92 uint16_t ve_missed_update;
97 avl_tree_t vc_offset_tree;
98 avl_tree_t vc_lastused_tree;
102 typedef struct vdev_queue_class {
106 * Sorted by offset or timestamp, depending on if the queue is
107 * LBA-ordered vs FIFO.
109 avl_tree_t vqc_queued_tree;
110 } vdev_queue_class_t;
114 vdev_queue_class_t vq_class[ZIO_PRIORITY_NUM_QUEUEABLE];
115 avl_tree_t vq_active_tree;
116 uint64_t vq_last_offset;
117 hrtime_t vq_io_complete_ts; /* time last i/o completed */
122 * Virtual device descriptor
126 * Common to all vdev types.
128 uint64_t vdev_id; /* child number in vdev parent */
129 uint64_t vdev_guid; /* unique ID for this vdev */
130 uint64_t vdev_guid_sum; /* self guid + all child guids */
131 uint64_t vdev_orig_guid; /* orig. guid prior to remove */
132 uint64_t vdev_asize; /* allocatable device capacity */
133 uint64_t vdev_min_asize; /* min acceptable asize */
134 uint64_t vdev_max_asize; /* max acceptable asize */
135 uint64_t vdev_ashift; /* block alignment shift */
137 * Logical block alignment shift
139 * The smallest sized/aligned I/O supported by the device.
141 uint64_t vdev_logical_ashift;
143 * Physical block alignment shift
145 * The device supports logical I/Os with vdev_logical_ashift
146 * size/alignment, but optimum performance will be achieved by
147 * aligning/sizing requests to vdev_physical_ashift. Smaller
148 * requests may be inflated or incur device level read-modify-write
151 * May be 0 to indicate no preference (i.e. use vdev_logical_ashift).
153 uint64_t vdev_physical_ashift;
154 uint64_t vdev_state; /* see VDEV_STATE_* #defines */
155 uint64_t vdev_prevstate; /* used when reopening a vdev */
156 vdev_ops_t *vdev_ops; /* vdev operations */
157 spa_t *vdev_spa; /* spa for this vdev */
158 void *vdev_tsd; /* type-specific data */
159 vnode_t *vdev_name_vp; /* vnode for pathname */
160 vnode_t *vdev_devid_vp; /* vnode for devid */
161 vdev_t *vdev_top; /* top-level vdev */
162 vdev_t *vdev_parent; /* parent vdev */
163 vdev_t **vdev_child; /* array of children */
164 uint64_t vdev_children; /* number of children */
165 vdev_stat_t vdev_stat; /* virtual device statistics */
166 boolean_t vdev_expanding; /* expand the vdev? */
167 boolean_t vdev_reopening; /* reopen in progress? */
168 int vdev_open_error; /* error on last open */
169 kthread_t *vdev_open_thread; /* thread opening children */
170 uint64_t vdev_crtxg; /* txg when top-level was added */
173 * Top-level vdev state.
175 uint64_t vdev_ms_array; /* metaslab array object */
176 uint64_t vdev_ms_shift; /* metaslab size shift */
177 uint64_t vdev_ms_count; /* number of metaslabs */
178 metaslab_group_t *vdev_mg; /* metaslab group */
179 metaslab_t **vdev_ms; /* metaslab array */
180 txg_list_t vdev_ms_list; /* per-txg dirty metaslab lists */
181 txg_list_t vdev_dtl_list; /* per-txg dirty DTL lists */
182 txg_node_t vdev_txg_node; /* per-txg dirty vdev linkage */
183 boolean_t vdev_remove_wanted; /* async remove wanted? */
184 boolean_t vdev_probe_wanted; /* async probe wanted? */
185 list_node_t vdev_config_dirty_node; /* config dirty list */
186 list_node_t vdev_state_dirty_node; /* state dirty list */
187 uint64_t vdev_deflate_ratio; /* deflation ratio (x512) */
188 uint64_t vdev_islog; /* is an intent log device */
189 uint64_t vdev_removing; /* device is being removed? */
190 boolean_t vdev_ishole; /* is a hole in the namespace */
195 range_tree_t *vdev_dtl[DTL_TYPES]; /* dirty time logs */
196 space_map_t *vdev_dtl_sm; /* dirty time log space map */
197 txg_node_t vdev_dtl_node; /* per-txg dirty DTL linkage */
198 uint64_t vdev_dtl_object; /* DTL object */
199 uint64_t vdev_psize; /* physical device capacity */
200 uint64_t vdev_wholedisk; /* true if this is a whole disk */
201 uint64_t vdev_offline; /* persistent offline state */
202 uint64_t vdev_faulted; /* persistent faulted state */
203 uint64_t vdev_degraded; /* persistent degraded state */
204 uint64_t vdev_removed; /* persistent removed state */
205 uint64_t vdev_resilver_txg; /* persistent resilvering state */
206 uint64_t vdev_nparity; /* number of parity devices for raidz */
207 char *vdev_path; /* vdev path (if any) */
208 char *vdev_devid; /* vdev devid (if any) */
209 char *vdev_physpath; /* vdev device path (if any) */
210 char *vdev_fru; /* physical FRU location */
211 uint64_t vdev_not_present; /* not present during import */
212 uint64_t vdev_unspare; /* unspare when resilvering done */
213 boolean_t vdev_nowritecache; /* true if flushwritecache failed */
214 boolean_t vdev_notrim; /* true if trim failed */
215 boolean_t vdev_checkremove; /* temporary online test */
216 boolean_t vdev_forcefault; /* force online fault */
217 boolean_t vdev_splitting; /* split or repair in progress */
218 boolean_t vdev_delayed_close; /* delayed device close? */
219 boolean_t vdev_tmpoffline; /* device taken offline temporarily? */
220 boolean_t vdev_detached; /* device detached? */
221 boolean_t vdev_cant_read; /* vdev is failing all reads */
222 boolean_t vdev_cant_write; /* vdev is failing all writes */
223 boolean_t vdev_isspare; /* was a hot spare */
224 boolean_t vdev_isl2cache; /* was a l2cache device */
225 vdev_queue_t vdev_queue; /* I/O deadline schedule queue */
226 vdev_cache_t vdev_cache; /* physical block cache */
227 spa_aux_vdev_t *vdev_aux; /* for l2cache vdevs */
228 zio_t *vdev_probe_zio; /* root of current probe */
229 vdev_aux_t vdev_label_aux; /* on-disk aux state */
230 struct trim_map *vdev_trimmap;
233 * For DTrace to work in userland (libzpool) context, these fields must
234 * remain at the end of the structure. DTrace will use the kernel's
235 * CTF definition for 'struct vdev', and since the size of a kmutex_t is
236 * larger in userland, the offsets for the rest of the fields would be
239 kmutex_t vdev_dtl_lock; /* vdev_dtl_{map,resilver} */
240 kmutex_t vdev_stat_lock; /* vdev_stat */
241 kmutex_t vdev_probe_lock; /* protects vdev_probe_zio */
244 #define VDEV_RAIDZ_MAXPARITY 3
246 #define VDEV_PAD_SIZE (8 << 10)
247 /* 2 padding areas (vl_pad1 and vl_pad2) to skip */
248 #define VDEV_SKIP_SIZE VDEV_PAD_SIZE * 2
249 #define VDEV_PHYS_SIZE (112 << 10)
250 #define VDEV_UBERBLOCK_RING (128 << 10)
252 #define VDEV_UBERBLOCK_SHIFT(vd) \
253 MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT)
254 #define VDEV_UBERBLOCK_COUNT(vd) \
255 (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd))
256 #define VDEV_UBERBLOCK_OFFSET(vd, n) \
257 offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)])
258 #define VDEV_UBERBLOCK_SIZE(vd) (1ULL << VDEV_UBERBLOCK_SHIFT(vd))
260 typedef struct vdev_phys {
261 char vp_nvlist[VDEV_PHYS_SIZE - sizeof (zio_eck_t)];
265 typedef struct vdev_label {
266 char vl_pad1[VDEV_PAD_SIZE]; /* 8K */
267 char vl_pad2[VDEV_PAD_SIZE]; /* 8K */
268 vdev_phys_t vl_vdev_phys; /* 112K */
269 char vl_uberblock[VDEV_UBERBLOCK_RING]; /* 128K */
270 } vdev_label_t; /* 256K total */
275 #define VDD_METASLAB 0x01
278 /* Offset of embedded boot loader region on each label */
279 #define VDEV_BOOT_OFFSET (2 * sizeof (vdev_label_t))
281 * Size of embedded boot loader region on each label.
282 * The total size of the first two labels plus the boot area is 4MB.
284 #define VDEV_BOOT_SIZE (7ULL << 19) /* 3.5M */
287 * Size of label regions at the start and end of each leaf device.
289 #define VDEV_LABEL_START_SIZE (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE)
290 #define VDEV_LABEL_END_SIZE (2 * sizeof (vdev_label_t))
291 #define VDEV_LABELS 4
292 #define VDEV_BEST_LABEL VDEV_LABELS
294 #define VDEV_ALLOC_LOAD 0
295 #define VDEV_ALLOC_ADD 1
296 #define VDEV_ALLOC_SPARE 2
297 #define VDEV_ALLOC_L2CACHE 3
298 #define VDEV_ALLOC_ROOTPOOL 4
299 #define VDEV_ALLOC_SPLIT 5
300 #define VDEV_ALLOC_ATTACH 6
303 * Allocate or free a vdev
305 extern vdev_t *vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid,
307 extern int vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *config,
308 vdev_t *parent, uint_t id, int alloctype);
309 extern void vdev_free(vdev_t *vd);
312 * Add or remove children and parents
314 extern void vdev_add_child(vdev_t *pvd, vdev_t *cvd);
315 extern void vdev_remove_child(vdev_t *pvd, vdev_t *cvd);
316 extern void vdev_compact_children(vdev_t *pvd);
317 extern vdev_t *vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops);
318 extern void vdev_remove_parent(vdev_t *cvd);
321 * vdev sync load and sync
323 extern void vdev_load_log_state(vdev_t *nvd, vdev_t *ovd);
324 extern boolean_t vdev_log_state_valid(vdev_t *vd);
325 extern void vdev_load(vdev_t *vd);
326 extern int vdev_dtl_load(vdev_t *vd);
327 extern void vdev_sync(vdev_t *vd, uint64_t txg);
328 extern void vdev_sync_done(vdev_t *vd, uint64_t txg);
329 extern void vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg);
330 extern void vdev_dirty_leaves(vdev_t *vd, int flags, uint64_t txg);
333 * Available vdev types.
335 extern vdev_ops_t vdev_root_ops;
336 extern vdev_ops_t vdev_mirror_ops;
337 extern vdev_ops_t vdev_replacing_ops;
338 extern vdev_ops_t vdev_raidz_ops;
340 extern vdev_ops_t vdev_geom_ops;
342 extern vdev_ops_t vdev_disk_ops;
344 extern vdev_ops_t vdev_file_ops;
345 extern vdev_ops_t vdev_missing_ops;
346 extern vdev_ops_t vdev_hole_ops;
347 extern vdev_ops_t vdev_spare_ops;
350 * Common size functions
352 extern uint64_t vdev_default_asize(vdev_t *vd, uint64_t psize);
353 extern uint64_t vdev_get_min_asize(vdev_t *vd);
354 extern void vdev_set_min_asize(vdev_t *vd);
359 /* zdb uses this tunable, so it must be declared here to make lint happy. */
360 extern int zfs_vdev_cache_size;
364 * The vdev_buf_t is used to translate between zio_t and buf_t, and back again.
366 typedef struct vdev_buf {
367 buf_t vb_buf; /* buffer that describes the io */
368 zio_t *vb_io; /* pointer back to the original zio_t */
376 #endif /* _SYS_VDEV_IMPL_H */