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) 2013 by Delphix. All rights reserved.
24 * Copyright (c) 2013 Steven Hartland. All rights reserved.
25 */
26
27 #ifndef _SYS_VDEV_IMPL_H
28 #define _SYS_VDEV_IMPL_H
29
30 #include <sys/avl.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
39 #ifdef __cplusplus
40 extern "C" {
41 #endif
42
43 /*
44 * Virtual device descriptors.
45 *
46 * All storage pool operations go through the virtual device framework,
47 * which provides data replication and I/O scheduling.
48 */
49
50 /*
51 * Forward declarations that lots of things need.
52 */
53 typedef struct vdev_queue vdev_queue_t;
54 typedef struct vdev_cache vdev_cache_t;
55 typedef struct vdev_cache_entry vdev_cache_entry_t;
56
57 /*
58 * Virtual device operations
59 */
60 typedef int vdev_open_func_t(vdev_t *vd, uint64_t *size, uint64_t *max_size,
61 uint64_t *ashift);
62 typedef void vdev_close_func_t(vdev_t *vd);
63 typedef uint64_t vdev_asize_func_t(vdev_t *vd, uint64_t psize);
64 typedef int vdev_io_start_func_t(zio_t *zio);
65 typedef void vdev_io_done_func_t(zio_t *zio);
66 typedef void vdev_state_change_func_t(vdev_t *vd, int, int);
67 typedef void vdev_hold_func_t(vdev_t *vd);
68 typedef void vdev_rele_func_t(vdev_t *vd);
69
70 typedef struct vdev_ops {
71 vdev_open_func_t *vdev_op_open;
72 vdev_close_func_t *vdev_op_close;
73 vdev_asize_func_t *vdev_op_asize;
74 vdev_io_start_func_t *vdev_op_io_start;
75 vdev_io_done_func_t *vdev_op_io_done;
76 vdev_state_change_func_t *vdev_op_state_change;
77 vdev_hold_func_t *vdev_op_hold;
78 vdev_rele_func_t *vdev_op_rele;
79 char vdev_op_type[16];
80 boolean_t vdev_op_leaf;
81 } vdev_ops_t;
82
83 /*
84 * Virtual device properties
85 */
86 struct vdev_cache_entry {
87 char *ve_data;
88 uint64_t ve_offset;
89 uint64_t ve_lastused;
90 avl_node_t ve_offset_node;
91 avl_node_t ve_lastused_node;
92 uint32_t ve_hits;
93 uint16_t ve_missed_update;
94 zio_t *ve_fill_io;
95 };
96
97 struct vdev_cache {
98 avl_tree_t vc_offset_tree;
99 avl_tree_t vc_lastused_tree;
100 kmutex_t vc_lock;
101 };
102
103 typedef struct vdev_queue_class {
104 uint32_t vqc_active;
105
106 /*
107 * Sorted by offset or timestamp, depending on if the queue is
108 * LBA-ordered vs FIFO.
109 */
110 avl_tree_t vqc_queued_tree;
111 } vdev_queue_class_t;
112
113 struct vdev_queue {
114 vdev_t *vq_vdev;
115 vdev_queue_class_t vq_class[ZIO_PRIORITY_NUM_QUEUEABLE];
116 avl_tree_t vq_active_tree;
117 uint64_t vq_last_offset;
118 hrtime_t vq_io_complete_ts; /* time last i/o completed */
119 kmutex_t vq_lock;
120 uint64_t vq_last_queued_offset;
121 };
122
123 /*
124 * Virtual device descriptor
125 */
126 struct vdev {
127 /*
128 * Common to all vdev types.
129 */
130 uint64_t vdev_id; /* child number in vdev parent */
131 uint64_t vdev_guid; /* unique ID for this vdev */
132 uint64_t vdev_guid_sum; /* self guid + all child guids */
133 uint64_t vdev_orig_guid; /* orig. guid prior to remove */
134 uint64_t vdev_asize; /* allocatable device capacity */
135 uint64_t vdev_min_asize; /* min acceptable asize */
136 uint64_t vdev_max_asize; /* max acceptable asize */
137 uint64_t vdev_ashift; /* block alignment shift */
138 uint64_t vdev_state; /* see VDEV_STATE_* #defines */
139 uint64_t vdev_prevstate; /* used when reopening a vdev */
140 vdev_ops_t *vdev_ops; /* vdev operations */
141 spa_t *vdev_spa; /* spa for this vdev */
142 void *vdev_tsd; /* type-specific data */
143 vnode_t *vdev_name_vp; /* vnode for pathname */
144 vnode_t *vdev_devid_vp; /* vnode for devid */
145 vdev_t *vdev_top; /* top-level vdev */
146 vdev_t *vdev_parent; /* parent vdev */
147 vdev_t **vdev_child; /* array of children */
148 uint64_t vdev_children; /* number of children */
149 vdev_stat_t vdev_stat; /* virtual device statistics */
150 boolean_t vdev_expanding; /* expand the vdev? */
151 boolean_t vdev_reopening; /* reopen in progress? */
152 int vdev_open_error; /* error on last open */
153 kthread_t *vdev_open_thread; /* thread opening children */
154 uint64_t vdev_crtxg; /* txg when top-level was added */
155
156 /*
157 * Top-level vdev state.
158 */
159 uint64_t vdev_ms_array; /* metaslab array object */
160 uint64_t vdev_ms_shift; /* metaslab size shift */
161 uint64_t vdev_ms_count; /* number of metaslabs */
162 metaslab_group_t *vdev_mg; /* metaslab group */
163 metaslab_t **vdev_ms; /* metaslab array */
164 txg_list_t vdev_ms_list; /* per-txg dirty metaslab lists */
165 txg_list_t vdev_dtl_list; /* per-txg dirty DTL lists */
166 txg_node_t vdev_txg_node; /* per-txg dirty vdev linkage */
167 boolean_t vdev_remove_wanted; /* async remove wanted? */
168 boolean_t vdev_probe_wanted; /* async probe wanted? */
169 list_node_t vdev_config_dirty_node; /* config dirty list */
170 list_node_t vdev_state_dirty_node; /* state dirty list */
171 uint64_t vdev_deflate_ratio; /* deflation ratio (x512) */
172 uint64_t vdev_islog; /* is an intent log device */
173 uint64_t vdev_removing; /* device is being removed? */
174 boolean_t vdev_ishole; /* is a hole in the namespace */
175
176 /*
177 * Leaf vdev state.
178 */
179 range_tree_t *vdev_dtl[DTL_TYPES]; /* dirty time logs */
180 space_map_t *vdev_dtl_sm; /* dirty time log space map */
181 txg_node_t vdev_dtl_node; /* per-txg dirty DTL linkage */
182 uint64_t vdev_dtl_object; /* DTL object */
183 uint64_t vdev_psize; /* physical device capacity */
184 uint64_t vdev_wholedisk; /* true if this is a whole disk */
185 uint64_t vdev_offline; /* persistent offline state */
186 uint64_t vdev_faulted; /* persistent faulted state */
187 uint64_t vdev_degraded; /* persistent degraded state */
188 uint64_t vdev_removed; /* persistent removed state */
189 uint64_t vdev_resilver_txg; /* persistent resilvering state */
190 uint64_t vdev_nparity; /* number of parity devices for raidz */
191 char *vdev_path; /* vdev path (if any) */
192 char *vdev_devid; /* vdev devid (if any) */
193 char *vdev_physpath; /* vdev device path (if any) */
194 char *vdev_fru; /* physical FRU location */
195 uint64_t vdev_not_present; /* not present during import */
196 uint64_t vdev_unspare; /* unspare when resilvering done */
197 boolean_t vdev_nowritecache; /* true if flushwritecache failed */
198 boolean_t vdev_checkremove; /* temporary online test */
199 boolean_t vdev_forcefault; /* force online fault */
200 boolean_t vdev_splitting; /* split or repair in progress */
201 boolean_t vdev_delayed_close; /* delayed device close? */
202 boolean_t vdev_tmpoffline; /* device taken offline temporarily? */
203 boolean_t vdev_detached; /* device detached? */
204 boolean_t vdev_cant_read; /* vdev is failing all reads */
205 boolean_t vdev_cant_write; /* vdev is failing all writes */
206 boolean_t vdev_isspare; /* was a hot spare */
207 boolean_t vdev_isl2cache; /* was a l2cache device */
208 vdev_queue_t vdev_queue; /* I/O deadline schedule queue */
209 vdev_cache_t vdev_cache; /* physical block cache */
210 spa_aux_vdev_t *vdev_aux; /* for l2cache vdevs */
211 zio_t *vdev_probe_zio; /* root of current probe */
212 vdev_aux_t vdev_label_aux; /* on-disk aux state */
213 uint16_t vdev_rotation_rate; /* rotational rate of the media */
214 #define VDEV_RATE_UNKNOWN 0
215 #define VDEV_RATE_NON_ROTATING 1
216
217 /*
218 * For DTrace to work in userland (libzpool) context, these fields must
219 * remain at the end of the structure. DTrace will use the kernel's
220 * CTF definition for 'struct vdev', and since the size of a kmutex_t is
221 * larger in userland, the offsets for the rest of the fields would be
222 * incorrect.
223 */
224 kmutex_t vdev_dtl_lock; /* vdev_dtl_{map,resilver} */
225 kmutex_t vdev_stat_lock; /* vdev_stat */
226 kmutex_t vdev_probe_lock; /* protects vdev_probe_zio */
227 };
228
229 #define VDEV_RAIDZ_MAXPARITY 3
230
231 #define VDEV_PAD_SIZE (8 << 10)
232 /* 2 padding areas (vl_pad1 and vl_pad2) to skip */
233 #define VDEV_SKIP_SIZE VDEV_PAD_SIZE * 2
234 #define VDEV_PHYS_SIZE (112 << 10)
235 #define VDEV_UBERBLOCK_RING (128 << 10)
236
237 #define VDEV_UBERBLOCK_SHIFT(vd) \
238 MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT)
239 #define VDEV_UBERBLOCK_COUNT(vd) \
240 (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd))
241 #define VDEV_UBERBLOCK_OFFSET(vd, n) \
242 offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)])
243 #define VDEV_UBERBLOCK_SIZE(vd) (1ULL << VDEV_UBERBLOCK_SHIFT(vd))
244
245 typedef struct vdev_phys {
246 char vp_nvlist[VDEV_PHYS_SIZE - sizeof (zio_eck_t)];
247 zio_eck_t vp_zbt;
248 } vdev_phys_t;
249
250 typedef struct vdev_label {
251 char vl_pad1[VDEV_PAD_SIZE]; /* 8K */
252 char vl_pad2[VDEV_PAD_SIZE]; /* 8K */
253 vdev_phys_t vl_vdev_phys; /* 112K */
254 char vl_uberblock[VDEV_UBERBLOCK_RING]; /* 128K */
255 } vdev_label_t; /* 256K total */
256
257 /*
258 * vdev_dirty() flags
259 */
260 #define VDD_METASLAB 0x01
261 #define VDD_DTL 0x02
262
263 /* Offset of embedded boot loader region on each label */
264 #define VDEV_BOOT_OFFSET (2 * sizeof (vdev_label_t))
265 /*
266 * Size of embedded boot loader region on each label.
267 * The total size of the first two labels plus the boot area is 4MB.
268 */
269 #define VDEV_BOOT_SIZE (7ULL << 19) /* 3.5M */
270
271 /*
272 * Size of label regions at the start and end of each leaf device.
273 */
274 #define VDEV_LABEL_START_SIZE (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE)
275 #define VDEV_LABEL_END_SIZE (2 * sizeof (vdev_label_t))
276 #define VDEV_LABELS 4
277 #define VDEV_BEST_LABEL VDEV_LABELS
278
279 #define VDEV_ALLOC_LOAD 0
280 #define VDEV_ALLOC_ADD 1
281 #define VDEV_ALLOC_SPARE 2
282 #define VDEV_ALLOC_L2CACHE 3
283 #define VDEV_ALLOC_ROOTPOOL 4
284 #define VDEV_ALLOC_SPLIT 5
285 #define VDEV_ALLOC_ATTACH 6
286
287 /*
288 * Allocate or free a vdev
289 */
290 extern vdev_t *vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid,
291 vdev_ops_t *ops);
292 extern int vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *config,
293 vdev_t *parent, uint_t id, int alloctype);
294 extern void vdev_free(vdev_t *vd);
295
296 /*
297 * Add or remove children and parents
298 */
299 extern void vdev_add_child(vdev_t *pvd, vdev_t *cvd);
300 extern void vdev_remove_child(vdev_t *pvd, vdev_t *cvd);
301 extern void vdev_compact_children(vdev_t *pvd);
302 extern vdev_t *vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops);
303 extern void vdev_remove_parent(vdev_t *cvd);
304
305 /*
306 * vdev sync load and sync
307 */
308 extern void vdev_load_log_state(vdev_t *nvd, vdev_t *ovd);
309 extern boolean_t vdev_log_state_valid(vdev_t *vd);
310 extern void vdev_load(vdev_t *vd);
311 extern int vdev_dtl_load(vdev_t *vd);
312 extern void vdev_sync(vdev_t *vd, uint64_t txg);
313 extern void vdev_sync_done(vdev_t *vd, uint64_t txg);
314 extern void vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg);
315 extern void vdev_dirty_leaves(vdev_t *vd, int flags, uint64_t txg);
316
317 /*
318 * Available vdev types.
319 */
320 extern vdev_ops_t vdev_root_ops;
321 extern vdev_ops_t vdev_mirror_ops;
322 extern vdev_ops_t vdev_replacing_ops;
323 extern vdev_ops_t vdev_raidz_ops;
324 extern vdev_ops_t vdev_disk_ops;
325 extern vdev_ops_t vdev_file_ops;
326 extern vdev_ops_t vdev_missing_ops;
327 extern vdev_ops_t vdev_hole_ops;
328 extern vdev_ops_t vdev_spare_ops;
329
330 /*
331 * Common size functions
332 */
333 extern uint64_t vdev_default_asize(vdev_t *vd, uint64_t psize);
334 extern uint64_t vdev_get_min_asize(vdev_t *vd);
335 extern void vdev_set_min_asize(vdev_t *vd);
336
337 /*
338 * Global variables
339 */
340 /* zdb uses this tunable, so it must be declared here to make lint happy. */
341 extern int zfs_vdev_cache_size;
342
343 /*
344 * The vdev_buf_t is used to translate between zio_t and buf_t, and back again.
345 */
346 typedef struct vdev_buf {
347 buf_t vb_buf; /* buffer that describes the io */
348 zio_t *vb_io; /* pointer back to the original zio_t */
349 } vdev_buf_t;
350
351 #ifdef __cplusplus
352 }
353 #endif
354
355 #endif /* _SYS_VDEV_IMPL_H */