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7938 Port ZOL #3712 disable LBA weighting on files and SSDs
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--- old/usr/src/uts/common/fs/zfs/sys/vdev_impl.h
+++ new/usr/src/uts/common/fs/zfs/sys/vdev_impl.h
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21 /*
22 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 23 * Copyright (c) 2011, 2015 by Delphix. All rights reserved.
24 24 */
25 25
26 26 #ifndef _SYS_VDEV_IMPL_H
27 27 #define _SYS_VDEV_IMPL_H
28 28
29 29 #include <sys/avl.h>
30 30 #include <sys/dmu.h>
31 31 #include <sys/metaslab.h>
32 32 #include <sys/nvpair.h>
33 33 #include <sys/space_map.h>
34 34 #include <sys/vdev.h>
35 35 #include <sys/dkio.h>
36 36 #include <sys/uberblock_impl.h>
37 37
38 38 #ifdef __cplusplus
39 39 extern "C" {
40 40 #endif
41 41
42 42 /*
43 43 * Virtual device descriptors.
44 44 *
45 45 * All storage pool operations go through the virtual device framework,
46 46 * which provides data replication and I/O scheduling.
47 47 */
48 48
49 49 /*
50 50 * Forward declarations that lots of things need.
51 51 */
52 52 typedef struct vdev_queue vdev_queue_t;
53 53 typedef struct vdev_cache vdev_cache_t;
54 54 typedef struct vdev_cache_entry vdev_cache_entry_t;
55 55 struct abd;
56 56
57 57 extern int zfs_vdev_queue_depth_pct;
58 58 extern uint32_t zfs_vdev_async_write_max_active;
59 59
60 60 /*
61 61 * Virtual device operations
62 62 */
63 63 typedef int vdev_open_func_t(vdev_t *vd, uint64_t *size, uint64_t *max_size,
64 64 uint64_t *ashift);
65 65 typedef void vdev_close_func_t(vdev_t *vd);
66 66 typedef uint64_t vdev_asize_func_t(vdev_t *vd, uint64_t psize);
67 67 typedef void vdev_io_start_func_t(zio_t *zio);
68 68 typedef void vdev_io_done_func_t(zio_t *zio);
69 69 typedef void vdev_state_change_func_t(vdev_t *vd, int, int);
70 70 typedef void vdev_hold_func_t(vdev_t *vd);
71 71 typedef void vdev_rele_func_t(vdev_t *vd);
72 72
73 73 typedef struct vdev_ops {
74 74 vdev_open_func_t *vdev_op_open;
75 75 vdev_close_func_t *vdev_op_close;
76 76 vdev_asize_func_t *vdev_op_asize;
77 77 vdev_io_start_func_t *vdev_op_io_start;
78 78 vdev_io_done_func_t *vdev_op_io_done;
79 79 vdev_state_change_func_t *vdev_op_state_change;
80 80 vdev_hold_func_t *vdev_op_hold;
81 81 vdev_rele_func_t *vdev_op_rele;
82 82 char vdev_op_type[16];
83 83 boolean_t vdev_op_leaf;
84 84 } vdev_ops_t;
85 85
86 86 /*
87 87 * Virtual device properties
88 88 */
89 89 struct vdev_cache_entry {
90 90 struct abd *ve_abd;
91 91 uint64_t ve_offset;
92 92 uint64_t ve_lastused;
93 93 avl_node_t ve_offset_node;
94 94 avl_node_t ve_lastused_node;
95 95 uint32_t ve_hits;
96 96 uint16_t ve_missed_update;
97 97 zio_t *ve_fill_io;
98 98 };
99 99
100 100 struct vdev_cache {
101 101 avl_tree_t vc_offset_tree;
102 102 avl_tree_t vc_lastused_tree;
103 103 kmutex_t vc_lock;
104 104 };
105 105
106 106 typedef struct vdev_queue_class {
107 107 uint32_t vqc_active;
108 108
109 109 /*
110 110 * Sorted by offset or timestamp, depending on if the queue is
111 111 * LBA-ordered vs FIFO.
112 112 */
113 113 avl_tree_t vqc_queued_tree;
114 114 } vdev_queue_class_t;
115 115
116 116 struct vdev_queue {
117 117 vdev_t *vq_vdev;
118 118 vdev_queue_class_t vq_class[ZIO_PRIORITY_NUM_QUEUEABLE];
119 119 avl_tree_t vq_active_tree;
120 120 avl_tree_t vq_read_offset_tree;
121 121 avl_tree_t vq_write_offset_tree;
122 122 uint64_t vq_last_offset;
123 123 hrtime_t vq_io_complete_ts; /* time last i/o completed */
124 124 kmutex_t vq_lock;
125 125 };
126 126
127 127 /*
128 128 * Virtual device descriptor
129 129 */
130 130 struct vdev {
131 131 /*
132 132 * Common to all vdev types.
133 133 */
134 134 uint64_t vdev_id; /* child number in vdev parent */
135 135 uint64_t vdev_guid; /* unique ID for this vdev */
136 136 uint64_t vdev_guid_sum; /* self guid + all child guids */
137 137 uint64_t vdev_orig_guid; /* orig. guid prior to remove */
138 138 uint64_t vdev_asize; /* allocatable device capacity */
139 139 uint64_t vdev_min_asize; /* min acceptable asize */
140 140 uint64_t vdev_max_asize; /* max acceptable asize */
141 141 uint64_t vdev_ashift; /* block alignment shift */
142 142 uint64_t vdev_state; /* see VDEV_STATE_* #defines */
143 143 uint64_t vdev_prevstate; /* used when reopening a vdev */
144 144 vdev_ops_t *vdev_ops; /* vdev operations */
145 145 spa_t *vdev_spa; /* spa for this vdev */
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146 146 void *vdev_tsd; /* type-specific data */
147 147 vnode_t *vdev_name_vp; /* vnode for pathname */
148 148 vnode_t *vdev_devid_vp; /* vnode for devid */
149 149 vdev_t *vdev_top; /* top-level vdev */
150 150 vdev_t *vdev_parent; /* parent vdev */
151 151 vdev_t **vdev_child; /* array of children */
152 152 uint64_t vdev_children; /* number of children */
153 153 vdev_stat_t vdev_stat; /* virtual device statistics */
154 154 boolean_t vdev_expanding; /* expand the vdev? */
155 155 boolean_t vdev_reopening; /* reopen in progress? */
156 + boolean_t vdev_nonrot; /* true if SSD, file, or Virtio */
156 157 int vdev_open_error; /* error on last open */
157 158 kthread_t *vdev_open_thread; /* thread opening children */
158 159 uint64_t vdev_crtxg; /* txg when top-level was added */
159 160
160 161 /*
161 162 * Top-level vdev state.
162 163 */
163 164 uint64_t vdev_ms_array; /* metaslab array object */
164 165 uint64_t vdev_ms_shift; /* metaslab size shift */
165 166 uint64_t vdev_ms_count; /* number of metaslabs */
166 167 metaslab_group_t *vdev_mg; /* metaslab group */
167 168 metaslab_t **vdev_ms; /* metaslab array */
168 169 txg_list_t vdev_ms_list; /* per-txg dirty metaslab lists */
169 170 txg_list_t vdev_dtl_list; /* per-txg dirty DTL lists */
170 171 txg_node_t vdev_txg_node; /* per-txg dirty vdev linkage */
171 172 boolean_t vdev_remove_wanted; /* async remove wanted? */
172 173 boolean_t vdev_probe_wanted; /* async probe wanted? */
173 174 list_node_t vdev_config_dirty_node; /* config dirty list */
174 175 list_node_t vdev_state_dirty_node; /* state dirty list */
175 176 uint64_t vdev_deflate_ratio; /* deflation ratio (x512) */
176 177 uint64_t vdev_islog; /* is an intent log device */
177 178 uint64_t vdev_removing; /* device is being removed? */
178 179 boolean_t vdev_ishole; /* is a hole in the namespace */
179 180 kmutex_t vdev_queue_lock; /* protects vdev_queue_depth */
180 181 uint64_t vdev_top_zap;
181 182
182 183 /*
183 184 * The queue depth parameters determine how many async writes are
184 185 * still pending (i.e. allocated by net yet issued to disk) per
185 186 * top-level (vdev_async_write_queue_depth) and the maximum allowed
186 187 * (vdev_max_async_write_queue_depth). These values only apply to
187 188 * top-level vdevs.
188 189 */
189 190 uint64_t vdev_async_write_queue_depth;
190 191 uint64_t vdev_max_async_write_queue_depth;
191 192
192 193 /*
193 194 * Leaf vdev state.
194 195 */
195 196 range_tree_t *vdev_dtl[DTL_TYPES]; /* dirty time logs */
196 197 space_map_t *vdev_dtl_sm; /* dirty time log space map */
197 198 txg_node_t vdev_dtl_node; /* per-txg dirty DTL linkage */
198 199 uint64_t vdev_dtl_object; /* DTL object */
199 200 uint64_t vdev_psize; /* physical device capacity */
200 201 uint64_t vdev_wholedisk; /* true if this is a whole disk */
201 202 uint64_t vdev_offline; /* persistent offline state */
202 203 uint64_t vdev_faulted; /* persistent faulted state */
203 204 uint64_t vdev_degraded; /* persistent degraded state */
204 205 uint64_t vdev_removed; /* persistent removed state */
205 206 uint64_t vdev_resilver_txg; /* persistent resilvering state */
206 207 uint64_t vdev_nparity; /* number of parity devices for raidz */
207 208 char *vdev_path; /* vdev path (if any) */
208 209 char *vdev_devid; /* vdev devid (if any) */
209 210 char *vdev_physpath; /* vdev device path (if any) */
210 211 char *vdev_fru; /* physical FRU location */
211 212 uint64_t vdev_not_present; /* not present during import */
212 213 uint64_t vdev_unspare; /* unspare when resilvering done */
213 214 boolean_t vdev_nowritecache; /* true if flushwritecache failed */
214 215 boolean_t vdev_checkremove; /* temporary online test */
215 216 boolean_t vdev_forcefault; /* force online fault */
216 217 boolean_t vdev_splitting; /* split or repair in progress */
217 218 boolean_t vdev_delayed_close; /* delayed device close? */
218 219 boolean_t vdev_tmpoffline; /* device taken offline temporarily? */
219 220 boolean_t vdev_detached; /* device detached? */
220 221 boolean_t vdev_cant_read; /* vdev is failing all reads */
221 222 boolean_t vdev_cant_write; /* vdev is failing all writes */
222 223 boolean_t vdev_isspare; /* was a hot spare */
223 224 boolean_t vdev_isl2cache; /* was a l2cache device */
224 225 vdev_queue_t vdev_queue; /* I/O deadline schedule queue */
225 226 vdev_cache_t vdev_cache; /* physical block cache */
226 227 spa_aux_vdev_t *vdev_aux; /* for l2cache and spares vdevs */
227 228 zio_t *vdev_probe_zio; /* root of current probe */
228 229 vdev_aux_t vdev_label_aux; /* on-disk aux state */
229 230 uint64_t vdev_leaf_zap;
230 231
231 232 /*
232 233 * For DTrace to work in userland (libzpool) context, these fields must
233 234 * remain at the end of the structure. DTrace will use the kernel's
234 235 * CTF definition for 'struct vdev', and since the size of a kmutex_t is
235 236 * larger in userland, the offsets for the rest of the fields would be
236 237 * incorrect.
237 238 */
238 239 kmutex_t vdev_dtl_lock; /* vdev_dtl_{map,resilver} */
239 240 kmutex_t vdev_stat_lock; /* vdev_stat */
240 241 kmutex_t vdev_probe_lock; /* protects vdev_probe_zio */
241 242 };
242 243
243 244 #define VDEV_RAIDZ_MAXPARITY 3
244 245
245 246 #define VDEV_PAD_SIZE (8 << 10)
246 247 /* 2 padding areas (vl_pad1 and vl_pad2) to skip */
247 248 #define VDEV_SKIP_SIZE VDEV_PAD_SIZE * 2
248 249 #define VDEV_PHYS_SIZE (112 << 10)
249 250 #define VDEV_UBERBLOCK_RING (128 << 10)
250 251
251 252 /* The largest uberblock we support is 8k. */
252 253 #define MAX_UBERBLOCK_SHIFT (13)
253 254 #define VDEV_UBERBLOCK_SHIFT(vd) \
254 255 MIN(MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT), \
255 256 MAX_UBERBLOCK_SHIFT)
256 257 #define VDEV_UBERBLOCK_COUNT(vd) \
257 258 (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd))
258 259 #define VDEV_UBERBLOCK_OFFSET(vd, n) \
259 260 offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)])
260 261 #define VDEV_UBERBLOCK_SIZE(vd) (1ULL << VDEV_UBERBLOCK_SHIFT(vd))
261 262
262 263 typedef struct vdev_phys {
263 264 char vp_nvlist[VDEV_PHYS_SIZE - sizeof (zio_eck_t)];
264 265 zio_eck_t vp_zbt;
265 266 } vdev_phys_t;
266 267
267 268 typedef struct vdev_label {
268 269 char vl_pad1[VDEV_PAD_SIZE]; /* 8K */
269 270 char vl_pad2[VDEV_PAD_SIZE]; /* 8K */
270 271 vdev_phys_t vl_vdev_phys; /* 112K */
271 272 char vl_uberblock[VDEV_UBERBLOCK_RING]; /* 128K */
272 273 } vdev_label_t; /* 256K total */
273 274
274 275 /*
275 276 * vdev_dirty() flags
276 277 */
277 278 #define VDD_METASLAB 0x01
278 279 #define VDD_DTL 0x02
279 280
280 281 /* Offset of embedded boot loader region on each label */
281 282 #define VDEV_BOOT_OFFSET (2 * sizeof (vdev_label_t))
282 283 /*
283 284 * Size of embedded boot loader region on each label.
284 285 * The total size of the first two labels plus the boot area is 4MB.
285 286 */
286 287 #define VDEV_BOOT_SIZE (7ULL << 19) /* 3.5M */
287 288
288 289 /*
289 290 * Size of label regions at the start and end of each leaf device.
290 291 */
291 292 #define VDEV_LABEL_START_SIZE (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE)
292 293 #define VDEV_LABEL_END_SIZE (2 * sizeof (vdev_label_t))
293 294 #define VDEV_LABELS 4
294 295 #define VDEV_BEST_LABEL VDEV_LABELS
295 296
296 297 #define VDEV_ALLOC_LOAD 0
297 298 #define VDEV_ALLOC_ADD 1
298 299 #define VDEV_ALLOC_SPARE 2
299 300 #define VDEV_ALLOC_L2CACHE 3
300 301 #define VDEV_ALLOC_ROOTPOOL 4
301 302 #define VDEV_ALLOC_SPLIT 5
302 303 #define VDEV_ALLOC_ATTACH 6
303 304
304 305 /*
305 306 * Allocate or free a vdev
306 307 */
307 308 extern vdev_t *vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid,
308 309 vdev_ops_t *ops);
309 310 extern int vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *config,
310 311 vdev_t *parent, uint_t id, int alloctype);
311 312 extern void vdev_free(vdev_t *vd);
312 313
313 314 /*
314 315 * Add or remove children and parents
315 316 */
316 317 extern void vdev_add_child(vdev_t *pvd, vdev_t *cvd);
317 318 extern void vdev_remove_child(vdev_t *pvd, vdev_t *cvd);
318 319 extern void vdev_compact_children(vdev_t *pvd);
319 320 extern vdev_t *vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops);
320 321 extern void vdev_remove_parent(vdev_t *cvd);
321 322
322 323 /*
323 324 * vdev sync load and sync
324 325 */
325 326 extern void vdev_load_log_state(vdev_t *nvd, vdev_t *ovd);
326 327 extern boolean_t vdev_log_state_valid(vdev_t *vd);
327 328 extern void vdev_load(vdev_t *vd);
328 329 extern int vdev_dtl_load(vdev_t *vd);
329 330 extern void vdev_sync(vdev_t *vd, uint64_t txg);
330 331 extern void vdev_sync_done(vdev_t *vd, uint64_t txg);
331 332 extern void vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg);
332 333 extern void vdev_dirty_leaves(vdev_t *vd, int flags, uint64_t txg);
333 334
334 335 /*
335 336 * Available vdev types.
336 337 */
337 338 extern vdev_ops_t vdev_root_ops;
338 339 extern vdev_ops_t vdev_mirror_ops;
339 340 extern vdev_ops_t vdev_replacing_ops;
340 341 extern vdev_ops_t vdev_raidz_ops;
341 342 extern vdev_ops_t vdev_disk_ops;
342 343 extern vdev_ops_t vdev_file_ops;
343 344 extern vdev_ops_t vdev_missing_ops;
344 345 extern vdev_ops_t vdev_hole_ops;
345 346 extern vdev_ops_t vdev_spare_ops;
346 347
347 348 /*
348 349 * Common size functions
349 350 */
350 351 extern uint64_t vdev_default_asize(vdev_t *vd, uint64_t psize);
351 352 extern uint64_t vdev_get_min_asize(vdev_t *vd);
352 353 extern void vdev_set_min_asize(vdev_t *vd);
353 354
354 355 /*
355 356 * Global variables
356 357 */
357 358 /* zdb uses this tunable, so it must be declared here to make lint happy. */
358 359 extern int zfs_vdev_cache_size;
359 360
360 361 /*
361 362 * The vdev_buf_t is used to translate between zio_t and buf_t, and back again.
362 363 */
363 364 typedef struct vdev_buf {
364 365 buf_t vb_buf; /* buffer that describes the io */
365 366 zio_t *vb_io; /* pointer back to the original zio_t */
366 367 } vdev_buf_t;
367 368
368 369 #ifdef __cplusplus
369 370 }
370 371 #endif
371 372
372 373 #endif /* _SYS_VDEV_IMPL_H */
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