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 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 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 *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 66 typedef struct vdev_ops { 67 vdev_open_func_t *vdev_op_open; 68 vdev_close_func_t *vdev_op_close; 69 vdev_asize_func_t *vdev_op_asize; 70 vdev_io_start_func_t *vdev_op_io_start; 71 vdev_io_done_func_t *vdev_op_io_done; 72 vdev_state_change_func_t *vdev_op_state_change; 73 char vdev_op_type[16]; 74 boolean_t vdev_op_leaf; 75 } vdev_ops_t; 76 77 /* 78 * Virtual device properties 79 */ 80 struct vdev_cache_entry { 81 char *ve_data; 82 uint64_t ve_offset; 83 uint64_t ve_lastused; 84 avl_node_t ve_offset_node; 85 avl_node_t ve_lastused_node; 86 uint32_t ve_hits; 87 uint16_t ve_missed_update; 88 zio_t *ve_fill_io; 89 }; 90 91 struct vdev_cache { 92 avl_tree_t vc_offset_tree; 93 avl_tree_t vc_lastused_tree; 94 kmutex_t vc_lock; 95 }; 96 97 struct vdev_queue { 98 avl_tree_t vq_deadline_tree; 99 avl_tree_t vq_read_tree; 100 avl_tree_t vq_write_tree; 101 avl_tree_t vq_pending_tree; 102 kmutex_t vq_lock; 103 }; 104 105 /* 106 * Virtual device descriptor 107 */ 108 struct vdev { 109 /* 110 * Common to all vdev types. 111 */ 112 uint64_t vdev_id; /* child number in vdev parent */ 113 uint64_t vdev_guid; /* unique ID for this vdev */ 114 uint64_t vdev_guid_sum; /* self guid + all child guids */ 115 uint64_t vdev_asize; /* allocatable device capacity */ 116 uint64_t vdev_min_asize; /* min acceptable asize */ 117 uint64_t vdev_ashift; /* block alignment shift */ 118 uint64_t vdev_state; /* see VDEV_STATE_* #defines */ 119 uint64_t vdev_prevstate; /* used when reopening a vdev */ 120 vdev_ops_t *vdev_ops; /* vdev operations */ 121 spa_t *vdev_spa; /* spa for this vdev */ 122 void *vdev_tsd; /* type-specific data */ 123 vdev_t *vdev_top; /* top-level vdev */ 124 vdev_t *vdev_parent; /* parent vdev */ 125 vdev_t **vdev_child; /* array of children */ 126 uint64_t vdev_children; /* number of children */ 127 space_map_t vdev_dtl[DTL_TYPES]; /* in-core dirty time logs */ 128 vdev_stat_t vdev_stat; /* virtual device statistics */ 129 boolean_t vdev_expanding; /* expand the vdev? */ 130 boolean_t vdev_reopening; /* reopen in progress? */ 131 int vdev_open_error; /* error on last open */ 132 kthread_t *vdev_open_thread; /* thread opening children */ 133 uint64_t vdev_crtxg; /* txg when top-level was added */ 134 135 /* 136 * Top-level vdev state. 137 */ 138 uint64_t vdev_ms_array; /* metaslab array object */ 139 uint64_t vdev_ms_shift; /* metaslab size shift */ 140 uint64_t vdev_ms_count; /* number of metaslabs */ 141 metaslab_group_t *vdev_mg; /* metaslab group */ 142 metaslab_t **vdev_ms; /* metaslab array */ 143 txg_list_t vdev_ms_list; /* per-txg dirty metaslab lists */ 144 txg_list_t vdev_dtl_list; /* per-txg dirty DTL lists */ 145 txg_node_t vdev_txg_node; /* per-txg dirty vdev linkage */ 146 boolean_t vdev_remove_wanted; /* async remove wanted? */ 147 boolean_t vdev_probe_wanted; /* async probe wanted? */ 148 boolean_t vdev_removing; /* device is being removed? */ 149 list_node_t vdev_config_dirty_node; /* config dirty list */ 150 list_node_t vdev_state_dirty_node; /* state dirty list */ 151 uint64_t vdev_deflate_ratio; /* deflation ratio (x512) */ 152 uint64_t vdev_islog; /* is an intent log device */ 153 uint64_t vdev_ishole; /* is a hole in the namespace */ 154 155 /* 156 * Leaf vdev state. 157 */ 158 uint64_t vdev_psize; /* physical device capacity */ 159 space_map_obj_t vdev_dtl_smo; /* dirty time log space map obj */ 160 txg_node_t vdev_dtl_node; /* per-txg dirty DTL linkage */ 161 uint64_t vdev_wholedisk; /* true if this is a whole disk */ 162 uint64_t vdev_offline; /* persistent offline state */ 163 uint64_t vdev_faulted; /* persistent faulted state */ 164 uint64_t vdev_degraded; /* persistent degraded state */ 165 uint64_t vdev_removed; /* persistent removed state */ 166 uint64_t vdev_nparity; /* number of parity devices for raidz */ 167 char *vdev_path; /* vdev path (if any) */ 168 char *vdev_devid; /* vdev devid (if any) */ 169 char *vdev_physpath; /* vdev device path (if any) */ 170 char *vdev_fru; /* physical FRU location */ 171 uint64_t vdev_not_present; /* not present during import */ 172 uint64_t vdev_unspare; /* unspare when resilvering done */ 173 hrtime_t vdev_last_try; /* last reopen time */ 174 boolean_t vdev_nowritecache; /* true if flushwritecache failed */ 175 boolean_t vdev_checkremove; /* temporary online test */ 176 boolean_t vdev_forcefault; /* force online fault */ 177 uint8_t vdev_tmpoffline; /* device taken offline temporarily? */ 178 uint8_t vdev_detached; /* device detached? */ 179 uint8_t vdev_cant_read; /* vdev is failing all reads */ 180 uint8_t vdev_cant_write; /* vdev is failing all writes */ 181 uint64_t vdev_isspare; /* was a hot spare */ 182 uint64_t vdev_isl2cache; /* was a l2cache device */ 183 vdev_queue_t vdev_queue; /* I/O deadline schedule queue */ 184 vdev_cache_t vdev_cache; /* physical block cache */ 185 spa_aux_vdev_t *vdev_aux; /* for l2cache vdevs */ 186 zio_t *vdev_probe_zio; /* root of current probe */ 187 vdev_aux_t vdev_label_aux; /* on-disk aux state */ 188 189 /* 190 * For DTrace to work in userland (libzpool) context, these fields must 191 * remain at the end of the structure. DTrace will use the kernel's 192 * CTF definition for 'struct vdev', and since the size of a kmutex_t is 193 * larger in userland, the offsets for the rest fields would be 194 * incorrect. 195 */ 196 kmutex_t vdev_dtl_lock; /* vdev_dtl_{map,resilver} */ 197 kmutex_t vdev_stat_lock; /* vdev_stat */ 198 kmutex_t vdev_probe_lock; /* protects vdev_probe_zio */ 199 }; 200 201 #define VDEV_RAIDZ_MAXPARITY 3 202 203 #define VDEV_PAD_SIZE (8 << 10) 204 /* 2 padding areas (vl_pad1 and vl_pad2) to skip */ 205 #define VDEV_SKIP_SIZE VDEV_PAD_SIZE * 2 206 #define VDEV_PHYS_SIZE (112 << 10) 207 #define VDEV_UBERBLOCK_RING (128 << 10) 208 209 #define VDEV_UBERBLOCK_SHIFT(vd) \ 210 MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT) 211 #define VDEV_UBERBLOCK_COUNT(vd) \ 212 (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd)) 213 #define VDEV_UBERBLOCK_OFFSET(vd, n) \ 214 offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)]) 215 #define VDEV_UBERBLOCK_SIZE(vd) (1ULL << VDEV_UBERBLOCK_SHIFT(vd)) 216 217 typedef struct vdev_phys { 218 char vp_nvlist[VDEV_PHYS_SIZE - sizeof (zio_block_tail_t)]; 219 zio_block_tail_t vp_zbt; 220 } vdev_phys_t; 221 222 typedef struct vdev_label { 223 char vl_pad1[VDEV_PAD_SIZE]; /* 8K */ 224 char vl_pad2[VDEV_PAD_SIZE]; /* 8K */ 225 vdev_phys_t vl_vdev_phys; /* 112K */ 226 char vl_uberblock[VDEV_UBERBLOCK_RING]; /* 128K */ 227 } vdev_label_t; /* 256K total */ 228 229 /* 230 * vdev_dirty() flags 231 */ 232 #define VDD_METASLAB 0x01 233 #define VDD_DTL 0x02 234 235 /* 236 * Size and offset of embedded boot loader region on each label. 237 * The total size of the first two labels plus the boot area is 4MB. 238 */ 239 #define VDEV_BOOT_OFFSET (2 * sizeof (vdev_label_t)) 240 #define VDEV_BOOT_SIZE (7ULL << 19) /* 3.5M */ 241 242 /* 243 * Size of label regions at the start and end of each leaf device. 244 */ 245 #define VDEV_LABEL_START_SIZE (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE) 246 #define VDEV_LABEL_END_SIZE (2 * sizeof (vdev_label_t)) 247 #define VDEV_LABELS 4 248 249 #define VDEV_ALLOC_LOAD 0 250 #define VDEV_ALLOC_ADD 1 251 #define VDEV_ALLOC_SPARE 2 252 #define VDEV_ALLOC_L2CACHE 3 253 #define VDEV_ALLOC_ROOTPOOL 4 254 255 /* 256 * Allocate or free a vdev 257 */ 258 extern vdev_t *vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid, 259 vdev_ops_t *ops); 260 extern int vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *config, 261 vdev_t *parent, uint_t id, int alloctype); 262 extern void vdev_free(vdev_t *vd); 263 264 /* 265 * Add or remove children and parents 266 */ 267 extern void vdev_add_child(vdev_t *pvd, vdev_t *cvd); 268 extern void vdev_remove_child(vdev_t *pvd, vdev_t *cvd); 269 extern void vdev_compact_children(vdev_t *pvd); 270 extern vdev_t *vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops); 271 extern void vdev_remove_parent(vdev_t *cvd); 272 273 /* 274 * vdev sync load and sync 275 */ 276 extern void vdev_load_log_state(vdev_t *nvd, vdev_t *ovd); 277 extern void vdev_load(vdev_t *vd); 278 extern void vdev_sync(vdev_t *vd, uint64_t txg); 279 extern void vdev_sync_done(vdev_t *vd, uint64_t txg); 280 extern void vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg); 281 282 /* 283 * Available vdev types. 284 */ 285 extern vdev_ops_t vdev_root_ops; 286 extern vdev_ops_t vdev_mirror_ops; 287 extern vdev_ops_t vdev_replacing_ops; 288 extern vdev_ops_t vdev_raidz_ops; 289 extern vdev_ops_t vdev_disk_ops; 290 extern vdev_ops_t vdev_file_ops; 291 extern vdev_ops_t vdev_missing_ops; 292 extern vdev_ops_t vdev_hole_ops; 293 extern vdev_ops_t vdev_spare_ops; 294 295 /* 296 * Common size functions 297 */ 298 extern uint64_t vdev_default_asize(vdev_t *vd, uint64_t psize); 299 extern uint64_t vdev_get_min_asize(vdev_t *vd); 300 extern void vdev_set_min_asize(vdev_t *vd); 301 302 /* 303 * zdb uses this tunable, so it must be declared here to make lint happy. 304 */ 305 extern int zfs_vdev_cache_size; 306 307 #ifdef __cplusplus 308 } 309 #endif 310 311 #endif /* _SYS_VDEV_IMPL_H */ 312