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.
25 #ifndef _SYS_VDEV_IMPL_H
26 #define _SYS_VDEV_IMPL_H
30 #include <sys/metaslab.h>
31 #include <sys/nvpair.h>
32 #include <sys/space_map.h>
35 #include <sys/uberblock_impl.h>
42 * Virtual device descriptors.
44 * All storage pool operations go through the virtual device framework,
45 * which provides data replication and I/O scheduling.
49 * Forward declarations that lots of things need.
51 typedef struct vdev_queue vdev_queue_t
;
52 typedef struct vdev_io vdev_io_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 *ashift
);
60 typedef void vdev_close_func_t(vdev_t
*vd
);
61 typedef uint64_t vdev_asize_func_t(vdev_t
*vd
, uint64_t psize
);
62 typedef int vdev_io_start_func_t(zio_t
*zio
);
63 typedef void vdev_io_done_func_t(zio_t
*zio
);
64 typedef void vdev_state_change_func_t(vdev_t
*vd
, int, int);
65 typedef void vdev_hold_func_t(vdev_t
*vd
);
66 typedef void vdev_rele_func_t(vdev_t
*vd
);
68 typedef struct vdev_ops
{
69 vdev_open_func_t
*vdev_op_open
;
70 vdev_close_func_t
*vdev_op_close
;
71 vdev_asize_func_t
*vdev_op_asize
;
72 vdev_io_start_func_t
*vdev_op_io_start
;
73 vdev_io_done_func_t
*vdev_op_io_done
;
74 vdev_state_change_func_t
*vdev_op_state_change
;
75 vdev_hold_func_t
*vdev_op_hold
;
76 vdev_rele_func_t
*vdev_op_rele
;
77 char vdev_op_type
[16];
78 boolean_t vdev_op_leaf
;
82 * Virtual device properties
84 struct vdev_cache_entry
{
88 avl_node_t ve_offset_node
;
89 avl_node_t ve_lastused_node
;
91 uint16_t ve_missed_update
;
96 avl_tree_t vc_offset_tree
;
97 avl_tree_t vc_lastused_tree
;
102 avl_tree_t vq_deadline_tree
;
103 avl_tree_t vq_read_tree
;
104 avl_tree_t vq_write_tree
;
105 avl_tree_t vq_pending_tree
;
111 char vi_buffer
[SPA_MAXBLOCKSIZE
]; /* Must be first */
116 * Virtual device descriptor
120 * Common to all vdev types.
122 uint64_t vdev_id
; /* child number in vdev parent */
123 uint64_t vdev_guid
; /* unique ID for this vdev */
124 uint64_t vdev_guid_sum
; /* self guid + all child guids */
125 uint64_t vdev_orig_guid
; /* orig. guid prior to remove */
126 uint64_t vdev_asize
; /* allocatable device capacity */
127 uint64_t vdev_min_asize
; /* min acceptable asize */
128 uint64_t vdev_ashift
; /* block alignment shift */
129 uint64_t vdev_state
; /* see VDEV_STATE_* #defines */
130 uint64_t vdev_prevstate
; /* used when reopening a vdev */
131 vdev_ops_t
*vdev_ops
; /* vdev operations */
132 spa_t
*vdev_spa
; /* spa for this vdev */
133 void *vdev_tsd
; /* type-specific data */
134 vnode_t
*vdev_name_vp
; /* vnode for pathname */
135 vnode_t
*vdev_devid_vp
; /* vnode for devid */
136 vdev_t
*vdev_top
; /* top-level vdev */
137 vdev_t
*vdev_parent
; /* parent vdev */
138 vdev_t
**vdev_child
; /* array of children */
139 uint64_t vdev_children
; /* number of children */
140 space_map_t vdev_dtl
[DTL_TYPES
]; /* in-core dirty time logs */
141 vdev_stat_t vdev_stat
; /* virtual device statistics */
142 boolean_t vdev_expanding
; /* expand the vdev? */
143 boolean_t vdev_reopening
; /* reopen in progress? */
144 int vdev_open_error
; /* error on last open */
145 kthread_t
*vdev_open_thread
; /* thread opening children */
146 uint64_t vdev_crtxg
; /* txg when top-level was added */
149 * Top-level vdev state.
151 uint64_t vdev_ms_array
; /* metaslab array object */
152 uint64_t vdev_ms_shift
; /* metaslab size shift */
153 uint64_t vdev_ms_count
; /* number of metaslabs */
154 metaslab_group_t
*vdev_mg
; /* metaslab group */
155 metaslab_t
**vdev_ms
; /* metaslab array */
156 txg_list_t vdev_ms_list
; /* per-txg dirty metaslab lists */
157 txg_list_t vdev_dtl_list
; /* per-txg dirty DTL lists */
158 txg_node_t vdev_txg_node
; /* per-txg dirty vdev linkage */
159 boolean_t vdev_remove_wanted
; /* async remove wanted? */
160 boolean_t vdev_probe_wanted
; /* async probe wanted? */
161 uint64_t vdev_removing
; /* device is being removed? */
162 list_node_t vdev_config_dirty_node
; /* config dirty list */
163 list_node_t vdev_state_dirty_node
; /* state dirty list */
164 uint64_t vdev_deflate_ratio
; /* deflation ratio (x512) */
165 uint64_t vdev_islog
; /* is an intent log device */
166 uint64_t vdev_ishole
; /* is a hole in the namespace */
171 uint64_t vdev_psize
; /* physical device capacity */
172 space_map_obj_t vdev_dtl_smo
; /* dirty time log space map obj */
173 txg_node_t vdev_dtl_node
; /* per-txg dirty DTL linkage */
174 uint64_t vdev_wholedisk
; /* true if this is a whole disk */
175 uint64_t vdev_offline
; /* persistent offline state */
176 uint64_t vdev_faulted
; /* persistent faulted state */
177 uint64_t vdev_degraded
; /* persistent degraded state */
178 uint64_t vdev_removed
; /* persistent removed state */
179 uint64_t vdev_resilvering
; /* persistent resilvering state */
180 uint64_t vdev_nparity
; /* number of parity devices for raidz */
181 char *vdev_path
; /* vdev path (if any) */
182 char *vdev_devid
; /* vdev devid (if any) */
183 char *vdev_physpath
; /* vdev device path (if any) */
184 char *vdev_fru
; /* physical FRU location */
185 uint64_t vdev_not_present
; /* not present during import */
186 uint64_t vdev_unspare
; /* unspare when resilvering done */
187 hrtime_t vdev_last_try
; /* last reopen time */
188 boolean_t vdev_nowritecache
; /* true if flushwritecache failed */
189 boolean_t vdev_checkremove
; /* temporary online test */
190 boolean_t vdev_forcefault
; /* force online fault */
191 boolean_t vdev_splitting
; /* split or repair in progress */
192 boolean_t vdev_delayed_close
; /* delayed device close? */
193 uint8_t vdev_tmpoffline
; /* device taken offline temporarily? */
194 uint8_t vdev_detached
; /* device detached? */
195 uint8_t vdev_cant_read
; /* vdev is failing all reads */
196 uint8_t vdev_cant_write
; /* vdev is failing all writes */
197 uint64_t vdev_isspare
; /* was a hot spare */
198 uint64_t vdev_isl2cache
; /* was a l2cache device */
199 vdev_queue_t vdev_queue
; /* I/O deadline schedule queue */
200 vdev_cache_t vdev_cache
; /* physical block cache */
201 spa_aux_vdev_t
*vdev_aux
; /* for l2cache vdevs */
202 zio_t
*vdev_probe_zio
; /* root of current probe */
203 vdev_aux_t vdev_label_aux
; /* on-disk aux state */
206 * For DTrace to work in userland (libzpool) context, these fields must
207 * remain at the end of the structure. DTrace will use the kernel's
208 * CTF definition for 'struct vdev', and since the size of a kmutex_t is
209 * larger in userland, the offsets for the rest fields would be
212 kmutex_t vdev_dtl_lock
; /* vdev_dtl_{map,resilver} */
213 kmutex_t vdev_stat_lock
; /* vdev_stat */
214 kmutex_t vdev_probe_lock
; /* protects vdev_probe_zio */
217 #define VDEV_RAIDZ_MAXPARITY 3
219 #define VDEV_PAD_SIZE (8 << 10)
220 /* 2 padding areas (vl_pad1 and vl_pad2) to skip */
221 #define VDEV_SKIP_SIZE VDEV_PAD_SIZE * 2
222 #define VDEV_PHYS_SIZE (112 << 10)
223 #define VDEV_UBERBLOCK_RING (128 << 10)
225 #define VDEV_UBERBLOCK_SHIFT(vd) \
226 MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT)
227 #define VDEV_UBERBLOCK_COUNT(vd) \
228 (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd))
229 #define VDEV_UBERBLOCK_OFFSET(vd, n) \
230 offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)])
231 #define VDEV_UBERBLOCK_SIZE(vd) (1ULL << VDEV_UBERBLOCK_SHIFT(vd))
233 typedef struct vdev_phys
{
234 char vp_nvlist
[VDEV_PHYS_SIZE
- sizeof (zio_eck_t
)];
238 typedef struct vdev_label
{
239 char vl_pad1
[VDEV_PAD_SIZE
]; /* 8K */
240 char vl_pad2
[VDEV_PAD_SIZE
]; /* 8K */
241 vdev_phys_t vl_vdev_phys
; /* 112K */
242 char vl_uberblock
[VDEV_UBERBLOCK_RING
]; /* 128K */
243 } vdev_label_t
; /* 256K total */
248 #define VDD_METASLAB 0x01
252 * Size and offset of embedded boot loader region on each label.
253 * The total size of the first two labels plus the boot area is 4MB.
255 #define VDEV_BOOT_OFFSET (2 * sizeof (vdev_label_t))
256 #define VDEV_BOOT_SIZE (7ULL << 19) /* 3.5M */
259 * Size of label regions at the start and end of each leaf device.
261 #define VDEV_LABEL_START_SIZE (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE)
262 #define VDEV_LABEL_END_SIZE (2 * sizeof (vdev_label_t))
263 #define VDEV_LABELS 4
265 #define VDEV_ALLOC_LOAD 0
266 #define VDEV_ALLOC_ADD 1
267 #define VDEV_ALLOC_SPARE 2
268 #define VDEV_ALLOC_L2CACHE 3
269 #define VDEV_ALLOC_ROOTPOOL 4
270 #define VDEV_ALLOC_SPLIT 5
271 #define VDEV_ALLOC_ATTACH 6
274 * Allocate or free a vdev
276 extern vdev_t
*vdev_alloc_common(spa_t
*spa
, uint_t id
, uint64_t guid
,
278 extern int vdev_alloc(spa_t
*spa
, vdev_t
**vdp
, nvlist_t
*config
,
279 vdev_t
*parent
, uint_t id
, int alloctype
);
280 extern void vdev_free(vdev_t
*vd
);
283 * Add or remove children and parents
285 extern void vdev_add_child(vdev_t
*pvd
, vdev_t
*cvd
);
286 extern void vdev_remove_child(vdev_t
*pvd
, vdev_t
*cvd
);
287 extern void vdev_compact_children(vdev_t
*pvd
);
288 extern vdev_t
*vdev_add_parent(vdev_t
*cvd
, vdev_ops_t
*ops
);
289 extern void vdev_remove_parent(vdev_t
*cvd
);
292 * vdev sync load and sync
294 extern void vdev_load_log_state(vdev_t
*nvd
, vdev_t
*ovd
);
295 extern boolean_t
vdev_log_state_valid(vdev_t
*vd
);
296 extern void vdev_load(vdev_t
*vd
);
297 extern void vdev_sync(vdev_t
*vd
, uint64_t txg
);
298 extern void vdev_sync_done(vdev_t
*vd
, uint64_t txg
);
299 extern void vdev_dirty(vdev_t
*vd
, int flags
, void *arg
, uint64_t txg
);
302 * Available vdev types.
304 extern vdev_ops_t vdev_root_ops
;
305 extern vdev_ops_t vdev_mirror_ops
;
306 extern vdev_ops_t vdev_replacing_ops
;
307 extern vdev_ops_t vdev_raidz_ops
;
308 extern vdev_ops_t vdev_disk_ops
;
309 extern vdev_ops_t vdev_file_ops
;
310 extern vdev_ops_t vdev_missing_ops
;
311 extern vdev_ops_t vdev_hole_ops
;
312 extern vdev_ops_t vdev_spare_ops
;
315 * Common size functions
317 extern uint64_t vdev_default_asize(vdev_t
*vd
, uint64_t psize
);
318 extern uint64_t vdev_get_min_asize(vdev_t
*vd
);
319 extern void vdev_set_min_asize(vdev_t
*vd
);
322 * zdb uses this tunable, so it must be declared here to make lint happy.
324 extern int zfs_vdev_cache_size
;
330 #endif /* _SYS_VDEV_IMPL_H */