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) 2012 by Delphix. All rights reserved. 24 */ 25 26 #ifndef _SYS_VDEV_IMPL_H 27 #define _SYS_VDEV_IMPL_H 28 29 #include <sys/avl.h> 30 #include <sys/dmu.h> 31 #include <sys/metaslab.h> 32 #include <sys/nvpair.h> 33 #include <sys/space_map.h> 34 #include <sys/vdev.h> 35 #include <sys/dkio.h> 36 #include <sys/uberblock_impl.h> 37 38 #ifdef __cplusplus 39 extern "C" { 40 #endif 41 42 /* 43 * Virtual device descriptors. 44 * 45 * All storage pool operations go through the virtual device framework, 46 * which provides data replication and I/O scheduling. 47 */ 48 49 /* 50 * Forward declarations that lots of things need. 51 */ 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; 55 56 /* 57 * Virtual device operations 58 */ 59 typedef int vdev_open_func_t(vdev_t *vd, uint64_t *size, uint64_t *max_size, 60 uint64_t *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); 68 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; 80 } vdev_ops_t; 81 82 /* 83 * Virtual device properties 84 */ 85 struct vdev_cache_entry { 86 char *ve_data; 87 uint64_t ve_offset; 88 uint64_t ve_lastused; 89 avl_node_t ve_offset_node; 90 avl_node_t ve_lastused_node; 91 uint32_t ve_hits; 92 uint16_t ve_missed_update; 93 zio_t *ve_fill_io; 94 }; 95 96 struct vdev_cache { 97 avl_tree_t vc_offset_tree; 98 avl_tree_t vc_lastused_tree; 99 kmutex_t vc_lock; 100 }; 101 102 struct vdev_queue { 103 avl_tree_t vq_deadline_tree; 104 avl_tree_t vq_read_tree; 105 avl_tree_t vq_write_tree; 106 avl_tree_t vq_pending_tree; 107 uint64_t vq_io_complete_ts; 108 uint64_t vq_io_delta_ts; 109 kmutex_t vq_lock; 110 }; 111 112 /* 113 * Virtual device descriptor 114 */ 115 struct vdev { 116 /* 117 * Common to all vdev types. 118 */ 119 uint64_t vdev_id; /* child number in vdev parent */ 120 uint64_t vdev_guid; /* unique ID for this vdev */ 121 uint64_t vdev_guid_sum; /* self guid + all child guids */ 122 uint64_t vdev_orig_guid; /* orig. guid prior to remove */ 123 uint64_t vdev_asize; /* allocatable device capacity */ 124 uint64_t vdev_min_asize; /* min acceptable asize */ 125 uint64_t vdev_max_asize; /* max acceptable asize */ 126 uint64_t vdev_ashift; /* block alignment shift */ 127 uint64_t vdev_state; /* see VDEV_STATE_* #defines */ 128 uint64_t vdev_prevstate; /* used when reopening a vdev */ 129 vdev_ops_t *vdev_ops; /* vdev operations */ 130 spa_t *vdev_spa; /* spa for this vdev */ 131 void *vdev_tsd; /* type-specific data */ 132 vnode_t *vdev_name_vp; /* vnode for pathname */ 133 vnode_t *vdev_devid_vp; /* vnode for devid */ 134 vdev_t *vdev_top; /* top-level vdev */ 135 vdev_t *vdev_parent; /* parent vdev */ 136 vdev_t **vdev_child; /* array of children */ 137 uint64_t vdev_children; /* number of children */ 138 space_map_t vdev_dtl[DTL_TYPES]; /* in-core dirty time logs */ 139 vdev_stat_t vdev_stat; /* virtual device statistics */ 140 boolean_t vdev_expanding; /* expand the vdev? */ 141 boolean_t vdev_reopening; /* reopen in progress? */ 142 int vdev_open_error; /* error on last open */ 143 kthread_t *vdev_open_thread; /* thread opening children */ 144 uint64_t vdev_crtxg; /* txg when top-level was added */ 145 146 /* 147 * Top-level vdev state. 148 */ 149 uint64_t vdev_ms_array; /* metaslab array object */ 150 uint64_t vdev_ms_shift; /* metaslab size shift */ 151 uint64_t vdev_ms_count; /* number of metaslabs */ 152 metaslab_group_t *vdev_mg; /* metaslab group */ 153 metaslab_t **vdev_ms; /* metaslab array */ 154 txg_list_t vdev_ms_list; /* per-txg dirty metaslab lists */ 155 txg_list_t vdev_dtl_list; /* per-txg dirty DTL lists */ 156 txg_node_t vdev_txg_node; /* per-txg dirty vdev linkage */ 157 boolean_t vdev_remove_wanted; /* async remove wanted? */ 158 boolean_t vdev_probe_wanted; /* async probe wanted? */ 159 uint64_t vdev_removing; /* device is being removed? */ 160 list_node_t vdev_config_dirty_node; /* config dirty list */ 161 list_node_t vdev_state_dirty_node; /* state dirty list */ 162 uint64_t vdev_deflate_ratio; /* deflation ratio (x512) */ 163 uint64_t vdev_islog; /* is an intent log device */ 164 uint64_t vdev_ishole; /* is a hole in the namespace */ 165 166 /* 167 * Leaf vdev state. 168 */ 169 uint64_t vdev_psize; /* physical device capacity */ 170 space_map_obj_t vdev_dtl_smo; /* dirty time log space map obj */ 171 txg_node_t vdev_dtl_node; /* per-txg dirty DTL linkage */ 172 uint64_t vdev_wholedisk; /* true if this is a whole disk */ 173 uint64_t vdev_offline; /* persistent offline state */ 174 uint64_t vdev_faulted; /* persistent faulted state */ 175 uint64_t vdev_degraded; /* persistent degraded state */ 176 uint64_t vdev_removed; /* persistent removed state */ 177 uint64_t vdev_resilvering; /* persistent resilvering state */ 178 uint64_t vdev_nparity; /* number of parity devices for raidz */ 179 char *vdev_path; /* vdev path (if any) */ 180 char *vdev_devid; /* vdev devid (if any) */ 181 char *vdev_physpath; /* vdev device path (if any) */ 182 char *vdev_fru; /* physical FRU location */ 183 uint64_t vdev_not_present; /* not present during import */ 184 uint64_t vdev_unspare; /* unspare when resilvering done */ 185 hrtime_t vdev_last_try; /* last reopen time */ 186 boolean_t vdev_nowritecache; /* true if flushwritecache failed */ 187 boolean_t vdev_checkremove; /* temporary online test */ 188 boolean_t vdev_forcefault; /* force online fault */ 189 boolean_t vdev_splitting; /* split or repair in progress */ 190 boolean_t vdev_delayed_close; /* delayed device close? */ 191 uint8_t vdev_tmpoffline; /* device taken offline temporarily? */ 192 uint8_t vdev_detached; /* device detached? */ 193 uint8_t vdev_cant_read; /* vdev is failing all reads */ 194 uint8_t vdev_cant_write; /* vdev is failing all writes */ 195 uint64_t vdev_isspare; /* was a hot spare */ 196 uint64_t vdev_isl2cache; /* was a l2cache device */ 197 vdev_queue_t vdev_queue; /* I/O deadline schedule queue */ 198 vdev_cache_t vdev_cache; /* physical block cache */ 199 spa_aux_vdev_t *vdev_aux; /* for l2cache vdevs */ 200 zio_t *vdev_probe_zio; /* root of current probe */ 201 vdev_aux_t vdev_label_aux; /* on-disk aux state */ 202 203 /* 204 * For DTrace to work in userland (libzpool) context, these fields must 205 * remain at the end of the structure. DTrace will use the kernel's 206 * CTF definition for 'struct vdev', and since the size of a kmutex_t is 207 * larger in userland, the offsets for the rest of the fields would be 208 * incorrect. 209 */ 210 kmutex_t vdev_dtl_lock; /* vdev_dtl_{map,resilver} */ 211 kmutex_t vdev_stat_lock; /* vdev_stat */ 212 kmutex_t vdev_probe_lock; /* protects vdev_probe_zio */ 213 }; 214 215 #define VDEV_RAIDZ_MAXPARITY 3 216 217 #define VDEV_PAD_SIZE (8 << 10) 218 /* 2 padding areas (vl_pad1 and vl_pad2) to skip */ 219 #define VDEV_SKIP_SIZE VDEV_PAD_SIZE * 2 220 #define VDEV_PHYS_SIZE (112 << 10) 221 #define VDEV_UBERBLOCK_RING (128 << 10) 222 223 #define VDEV_UBERBLOCK_SHIFT(vd) \ 224 MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT) 225 #define VDEV_UBERBLOCK_COUNT(vd) \ 226 (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd)) 227 #define VDEV_UBERBLOCK_OFFSET(vd, n) \ 228 offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)]) 229 #define VDEV_UBERBLOCK_SIZE(vd) (1ULL << VDEV_UBERBLOCK_SHIFT(vd)) 230 231 typedef struct vdev_phys { 232 char vp_nvlist[VDEV_PHYS_SIZE - sizeof (zio_eck_t)]; 233 zio_eck_t vp_zbt; 234 } vdev_phys_t; 235 236 typedef struct vdev_label { 237 char vl_pad1[VDEV_PAD_SIZE]; /* 8K */ 238 char vl_pad2[VDEV_PAD_SIZE]; /* 8K */ 239 vdev_phys_t vl_vdev_phys; /* 112K */ 240 char vl_uberblock[VDEV_UBERBLOCK_RING]; /* 128K */ 241 } vdev_label_t; /* 256K total */ 242 243 /* 244 * vdev_dirty() flags 245 */ 246 #define VDD_METASLAB 0x01 247 #define VDD_DTL 0x02 248 249 /* 250 * Size and offset of embedded boot loader region on each label. 251 * The total size of the first two labels plus the boot area is 4MB. 252 */ 253 #define VDEV_BOOT_OFFSET (2 * sizeof (vdev_label_t)) 254 #define VDEV_BOOT_SIZE (7ULL << 19) /* 3.5M */ 255 256 /* 257 * Size of label regions at the start and end of each leaf device. 258 */ 259 #define VDEV_LABEL_START_SIZE (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE) 260 #define VDEV_LABEL_END_SIZE (2 * sizeof (vdev_label_t)) 261 #define VDEV_LABELS 4 262 #define VDEV_BEST_LABEL VDEV_LABELS 263 264 #define VDEV_ALLOC_LOAD 0 265 #define VDEV_ALLOC_ADD 1 266 #define VDEV_ALLOC_SPARE 2 267 #define VDEV_ALLOC_L2CACHE 3 268 #define VDEV_ALLOC_ROOTPOOL 4 269 #define VDEV_ALLOC_SPLIT 5 270 #define VDEV_ALLOC_ATTACH 6 271 272 /* 273 * Allocate or free a vdev 274 */ 275 extern vdev_t *vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid, 276 vdev_ops_t *ops); 277 extern int vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *config, 278 vdev_t *parent, uint_t id, int alloctype); 279 extern void vdev_free(vdev_t *vd); 280 281 /* 282 * Add or remove children and parents 283 */ 284 extern void vdev_add_child(vdev_t *pvd, vdev_t *cvd); 285 extern void vdev_remove_child(vdev_t *pvd, vdev_t *cvd); 286 extern void vdev_compact_children(vdev_t *pvd); 287 extern vdev_t *vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops); 288 extern void vdev_remove_parent(vdev_t *cvd); 289 290 /* 291 * vdev sync load and sync 292 */ 293 extern void vdev_load_log_state(vdev_t *nvd, vdev_t *ovd); 294 extern boolean_t vdev_log_state_valid(vdev_t *vd); 295 extern void vdev_load(vdev_t *vd); 296 extern void vdev_sync(vdev_t *vd, uint64_t txg); 297 extern void vdev_sync_done(vdev_t *vd, uint64_t txg); 298 extern void vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg); 299 300 /* 301 * Available vdev types. 302 */ 303 extern vdev_ops_t vdev_root_ops; 304 extern vdev_ops_t vdev_mirror_ops; 305 extern vdev_ops_t vdev_replacing_ops; 306 extern vdev_ops_t vdev_raidz_ops; 307 extern vdev_ops_t vdev_disk_ops; 308 extern vdev_ops_t vdev_file_ops; 309 extern vdev_ops_t vdev_missing_ops; 310 extern vdev_ops_t vdev_hole_ops; 311 extern vdev_ops_t vdev_spare_ops; 312 313 /* 314 * Common size functions 315 */ 316 extern uint64_t vdev_default_asize(vdev_t *vd, uint64_t psize); 317 extern uint64_t vdev_get_min_asize(vdev_t *vd); 318 extern void vdev_set_min_asize(vdev_t *vd); 319 320 /* 321 * zdb uses this tunable, so it must be declared here to make lint happy. 322 */ 323 extern int zfs_vdev_cache_size; 324 325 /* 326 * The vdev_buf_t is used to translate between zio_t and buf_t, and back again. 327 */ 328 typedef struct vdev_buf { 329 buf_t vb_buf; /* buffer that describes the io */ 330 zio_t *vb_io; /* pointer back to the original zio_t */ 331 } vdev_buf_t; 332 333 #ifdef __cplusplus 334 } 335 #endif 336 337 #endif /* _SYS_VDEV_IMPL_H */ 338