vdev_impl.h revision 263393
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 */ 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 39extern "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 */ 52typedef struct vdev_queue vdev_queue_t; 53typedef struct vdev_cache vdev_cache_t; 54typedef struct vdev_cache_entry vdev_cache_entry_t; 55 56/* 57 * Virtual device operations 58 */ 59typedef int vdev_open_func_t(vdev_t *vd, uint64_t *size, uint64_t *max_size, 60 uint64_t *logical_ashift, uint64_t *physical_ashift); 61typedef void vdev_close_func_t(vdev_t *vd); 62typedef uint64_t vdev_asize_func_t(vdev_t *vd, uint64_t psize); 63typedef int vdev_io_start_func_t(zio_t *zio); 64typedef void vdev_io_done_func_t(zio_t *zio); 65typedef void vdev_state_change_func_t(vdev_t *vd, int, int); 66typedef void vdev_hold_func_t(vdev_t *vd); 67typedef void vdev_rele_func_t(vdev_t *vd); 68 69typedef 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 */ 85struct 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 96struct vdev_cache { 97 avl_tree_t vc_offset_tree; 98 avl_tree_t vc_lastused_tree; 99 kmutex_t vc_lock; 100}; 101 102typedef struct vdev_queue_class { 103 uint32_t vqc_active; 104 105 /* 106 * Sorted by offset or timestamp, depending on if the queue is 107 * LBA-ordered vs FIFO. 108 */ 109 avl_tree_t vqc_queued_tree; 110} vdev_queue_class_t; 111 112struct vdev_queue { 113 vdev_t *vq_vdev; 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 */ 118 kmutex_t vq_lock; 119}; 120 121/* 122 * Virtual device descriptor 123 */ 124struct vdev { 125 /* 126 * Common to all vdev types. 127 */ 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 */ 136 /* 137 * Logical block alignment shift 138 * 139 * The smallest sized/aligned I/O supported by the device. 140 */ 141 uint64_t vdev_logical_ashift; 142 /* 143 * Physical block alignment shift 144 * 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 149 * operations. 150 * 151 * May be 0 to indicate no preference (i.e. use vdev_logical_ashift). 152 */ 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 */ 171 172 /* 173 * Top-level vdev state. 174 */ 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 */ 191 192 /* 193 * Leaf vdev state. 194 */ 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; 231 232 /* 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 237 * incorrect. 238 */ 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 */ 242}; 243 244#define VDEV_RAIDZ_MAXPARITY 3 245 246#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) 251 252#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)) 259 260typedef struct vdev_phys { 261 char vp_nvlist[VDEV_PHYS_SIZE - sizeof (zio_eck_t)]; 262 zio_eck_t vp_zbt; 263} vdev_phys_t; 264 265typedef 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 */ 271 272/* 273 * vdev_dirty() flags 274 */ 275#define VDD_METASLAB 0x01 276#define VDD_DTL 0x02 277 278/* Offset of embedded boot loader region on each label */ 279#define VDEV_BOOT_OFFSET (2 * sizeof (vdev_label_t)) 280/* 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. 283 */ 284#define VDEV_BOOT_SIZE (7ULL << 19) /* 3.5M */ 285 286/* 287 * Size of label regions at the start and end of each leaf device. 288 */ 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 293 294#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 6 301 302/* 303 * Allocate or free a vdev 304 */ 305extern vdev_t *vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid, 306 vdev_ops_t *ops); 307extern int vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *config, 308 vdev_t *parent, uint_t id, int alloctype); 309extern void vdev_free(vdev_t *vd); 310 311/* 312 * Add or remove children and parents 313 */ 314extern void vdev_add_child(vdev_t *pvd, vdev_t *cvd); 315extern void vdev_remove_child(vdev_t *pvd, vdev_t *cvd); 316extern void vdev_compact_children(vdev_t *pvd); 317extern vdev_t *vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops); 318extern void vdev_remove_parent(vdev_t *cvd); 319 320/* 321 * vdev sync load and sync 322 */ 323extern void vdev_load_log_state(vdev_t *nvd, vdev_t *ovd); 324extern boolean_t vdev_log_state_valid(vdev_t *vd); 325extern void vdev_load(vdev_t *vd); 326extern int vdev_dtl_load(vdev_t *vd); 327extern void vdev_sync(vdev_t *vd, uint64_t txg); 328extern void vdev_sync_done(vdev_t *vd, uint64_t txg); 329extern void vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg); 330extern void vdev_dirty_leaves(vdev_t *vd, int flags, uint64_t txg); 331 332/* 333 * Available vdev types. 334 */ 335extern vdev_ops_t vdev_root_ops; 336extern vdev_ops_t vdev_mirror_ops; 337extern vdev_ops_t vdev_replacing_ops; 338extern vdev_ops_t vdev_raidz_ops; 339#ifdef _KERNEL 340extern vdev_ops_t vdev_geom_ops; 341#else 342extern vdev_ops_t vdev_disk_ops; 343#endif 344extern vdev_ops_t vdev_file_ops; 345extern vdev_ops_t vdev_missing_ops; 346extern vdev_ops_t vdev_hole_ops; 347extern vdev_ops_t vdev_spare_ops; 348 349/* 350 * Common size functions 351 */ 352extern uint64_t vdev_default_asize(vdev_t *vd, uint64_t psize); 353extern uint64_t vdev_get_min_asize(vdev_t *vd); 354extern void vdev_set_min_asize(vdev_t *vd); 355 356/* 357 * Global variables 358 */ 359/* zdb uses this tunable, so it must be declared here to make lint happy. */ 360extern int zfs_vdev_cache_size; 361 362#ifdef illumos 363/* 364 * The vdev_buf_t is used to translate between zio_t and buf_t, and back again. 365 */ 366typedef 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 */ 369} vdev_buf_t; 370#endif 371 372#ifdef __cplusplus 373} 374#endif 375 376#endif /* _SYS_VDEV_IMPL_H */ 377