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 2006 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 #pragma ident "%Z%%M% %I% %E% SMI" 30 31 #include <sys/avl.h> 32 #include <sys/dmu.h> 33 #include <sys/metaslab.h> 34 #include <sys/nvpair.h> 35 #include <sys/space_map.h> 36 #include <sys/vdev.h> 37 #include <sys/dkio.h> 38 #include <sys/uberblock_impl.h> 39 40 #ifdef __cplusplus 41 extern "C" { 42 #endif 43 44 /* 45 * Virtual device descriptors. 46 * 47 * All storage pool operations go through the virtual device framework, 48 * which provides data replication and I/O scheduling. 49 */ 50 51 /* 52 * Forward declarations that lots of things need. 53 */ 54 typedef struct vdev_queue vdev_queue_t; 55 typedef struct vdev_cache vdev_cache_t; 56 typedef struct vdev_cache_entry vdev_cache_entry_t; 57 58 /* 59 * Virtual device operations 60 */ 61 typedef int vdev_open_func_t(vdev_t *vd, uint64_t *size, 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 void 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 68 typedef struct vdev_ops { 69 vdev_open_func_t *vdev_op_open; 70 vdev_close_func_t *vdev_op_close; 71 vdev_asize_func_t *vdev_op_asize; 72 vdev_io_start_func_t *vdev_op_io_start; 73 vdev_io_done_func_t *vdev_op_io_done; 74 vdev_state_change_func_t *vdev_op_state_change; 75 char vdev_op_type[16]; 76 boolean_t vdev_op_leaf; 77 } vdev_ops_t; 78 79 /* 80 * Virtual device properties 81 */ 82 struct vdev_cache_entry { 83 char *ve_data; 84 uint64_t ve_offset; 85 uint64_t ve_lastused; 86 avl_node_t ve_offset_node; 87 avl_node_t ve_lastused_node; 88 uint32_t ve_hits; 89 uint16_t ve_missed_update; 90 zio_t *ve_fill_io; 91 }; 92 93 struct vdev_cache { 94 uint64_t vc_size; 95 uint64_t vc_bshift; 96 uint64_t vc_blocksize; 97 uint64_t vc_max; 98 avl_tree_t vc_offset_tree; 99 avl_tree_t vc_lastused_tree; 100 kmutex_t vc_lock; 101 }; 102 103 struct vdev_queue { 104 uint64_t vq_min_pending; 105 uint64_t vq_max_pending; 106 uint64_t vq_scrub_limit; 107 uint64_t vq_agg_limit; 108 uint64_t vq_time_shift; 109 uint64_t vq_ramp_rate; 110 uint64_t vq_scrub_count; 111 avl_tree_t vq_deadline_tree; 112 avl_tree_t vq_read_tree; 113 avl_tree_t vq_write_tree; 114 avl_tree_t vq_pending_tree; 115 kmutex_t vq_lock; 116 }; 117 118 /* 119 * Virtual device descriptor 120 */ 121 struct vdev { 122 /* 123 * Common to all vdev types. 124 */ 125 uint64_t vdev_id; /* child number in vdev parent */ 126 uint64_t vdev_guid; /* unique ID for this vdev */ 127 uint64_t vdev_guid_sum; /* self guid + all child guids */ 128 uint64_t vdev_asize; /* allocatable device capacity */ 129 uint64_t vdev_ashift; /* block alignment shift */ 130 uint64_t vdev_state; /* see VDEV_STATE_* #defines */ 131 vdev_ops_t *vdev_ops; /* vdev operations */ 132 spa_t *vdev_spa; /* spa for this vdev */ 133 void *vdev_tsd; /* type-specific data */ 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_map; /* dirty time log in-core state */ 139 space_map_t vdev_dtl_scrub; /* DTL for scrub repair writes */ 140 vdev_stat_t vdev_stat; /* virtual device statistics */ 141 142 /* 143 * Top-level vdev state. 144 */ 145 uint64_t vdev_ms_array; /* metaslab array object */ 146 uint64_t vdev_ms_shift; /* metaslab size shift */ 147 uint64_t vdev_ms_count; /* number of metaslabs */ 148 metaslab_group_t *vdev_mg; /* metaslab group */ 149 metaslab_t **vdev_ms; /* metaslab array */ 150 txg_list_t vdev_ms_list; /* per-txg dirty metaslab lists */ 151 txg_list_t vdev_dtl_list; /* per-txg dirty DTL lists */ 152 txg_node_t vdev_txg_node; /* per-txg dirty vdev linkage */ 153 uint8_t vdev_reopen_wanted; /* async reopen wanted? */ 154 list_node_t vdev_dirty_node; /* config dirty list */ 155 156 /* 157 * Leaf vdev state. 158 */ 159 uint64_t vdev_psize; /* physical device capacity */ 160 space_map_obj_t vdev_dtl; /* dirty time log on-disk state */ 161 txg_node_t vdev_dtl_node; /* per-txg dirty DTL linkage */ 162 uint64_t vdev_wholedisk; /* true if this is a whole disk */ 163 uint64_t vdev_offline; /* device taken offline? */ 164 char *vdev_path; /* vdev path (if any) */ 165 char *vdev_devid; /* vdev devid (if any) */ 166 uint64_t vdev_fault_arg; /* fault injection paramater */ 167 int vdev_fault_mask; /* zio types to fault */ 168 uint8_t vdev_fault_mode; /* fault injection mode */ 169 uint8_t vdev_cache_active; /* vdev_cache and vdev_queue */ 170 uint8_t vdev_tmpoffline; /* device taken offline temporarily? */ 171 uint8_t vdev_detached; /* device detached? */ 172 vdev_queue_t vdev_queue; /* I/O deadline schedule queue */ 173 vdev_cache_t vdev_cache; /* physical block cache */ 174 uint64_t vdev_not_present; /* not present during import */ 175 hrtime_t vdev_last_try; /* last reopen time */ 176 boolean_t vdev_nowritecache; /* true if flushwritecache failed */ 177 178 /* 179 * For DTrace to work in userland (libzpool) context, these fields must 180 * remain at the end of the structure. DTrace will use the kernel's 181 * CTF definition for 'struct vdev', and since the size of a kmutex_t is 182 * larger in userland, the offsets for the rest fields would be 183 * incorrect. 184 */ 185 kmutex_t vdev_dtl_lock; /* vdev_dtl_{map,resilver} */ 186 kmutex_t vdev_stat_lock; /* vdev_stat */ 187 }; 188 189 #define VDEV_SKIP_SIZE (8 << 10) 190 #define VDEV_BOOT_HEADER_SIZE (8 << 10) 191 #define VDEV_PHYS_SIZE (112 << 10) 192 #define VDEV_UBERBLOCK_RING (128 << 10) 193 194 #define VDEV_UBERBLOCK_SHIFT(vd) \ 195 MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT) 196 #define VDEV_UBERBLOCK_COUNT(vd) \ 197 (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd)) 198 #define VDEV_UBERBLOCK_OFFSET(vd, n) \ 199 offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)]) 200 #define VDEV_UBERBLOCK_SIZE(vd) (1ULL << VDEV_UBERBLOCK_SHIFT(vd)) 201 202 #define VDEV_BOOT_MAGIC 0x2f5b007b10c /* ZFS boot block */ 203 #define VDEV_BOOT_VERSION 1 /* version number */ 204 205 typedef struct vdev_boot_header { 206 uint64_t vb_magic; /* VDEV_BOOT_MAGIC */ 207 uint64_t vb_version; /* VDEV_BOOT_VERSION */ 208 uint64_t vb_offset; /* start offset (bytes) */ 209 uint64_t vb_size; /* size (bytes) */ 210 char vb_pad[VDEV_BOOT_HEADER_SIZE - 4 * sizeof (uint64_t)]; 211 } vdev_boot_header_t; 212 213 typedef struct vdev_phys { 214 char vp_nvlist[VDEV_PHYS_SIZE - sizeof (zio_block_tail_t)]; 215 zio_block_tail_t vp_zbt; 216 } vdev_phys_t; 217 218 typedef struct vdev_label { 219 char vl_pad[VDEV_SKIP_SIZE]; /* 8K */ 220 vdev_boot_header_t vl_boot_header; /* 8K */ 221 vdev_phys_t vl_vdev_phys; /* 112K */ 222 char vl_uberblock[VDEV_UBERBLOCK_RING]; /* 128K */ 223 } vdev_label_t; /* 256K total */ 224 225 /* 226 * vdev_dirty() flags 227 */ 228 #define VDD_METASLAB 0x01 229 #define VDD_DTL 0x02 230 231 /* 232 * Size and offset of embedded boot loader region on each label. 233 * The total size of the first two labels plus the boot area is 4MB. 234 */ 235 #define VDEV_BOOT_OFFSET (2 * sizeof (vdev_label_t)) 236 #define VDEV_BOOT_SIZE (7ULL << 19) /* 3.5M */ 237 238 /* 239 * Size of label regions at the start and end of each leaf device. 240 */ 241 #define VDEV_LABEL_START_SIZE (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE) 242 #define VDEV_LABEL_END_SIZE (2 * sizeof (vdev_label_t)) 243 #define VDEV_LABELS 4 244 245 #define VDEV_ALLOC_LOAD 0 246 #define VDEV_ALLOC_ADD 1 247 248 /* 249 * Allocate or free a vdev 250 */ 251 extern vdev_t *vdev_alloc(spa_t *spa, nvlist_t *config, vdev_t *parent, 252 uint_t id, int alloctype); 253 extern void vdev_free(vdev_t *vd); 254 255 /* 256 * Add or remove children and parents 257 */ 258 extern void vdev_add_child(vdev_t *pvd, vdev_t *cvd); 259 extern void vdev_remove_child(vdev_t *pvd, vdev_t *cvd); 260 extern void vdev_compact_children(vdev_t *pvd); 261 extern vdev_t *vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops); 262 extern void vdev_remove_parent(vdev_t *cvd); 263 264 /* 265 * vdev sync load and sync 266 */ 267 extern int vdev_load(vdev_t *vd); 268 extern void vdev_sync(vdev_t *vd, uint64_t txg); 269 extern void vdev_sync_done(vdev_t *vd, uint64_t txg); 270 extern void vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg); 271 272 /* 273 * Available vdev types. 274 */ 275 extern vdev_ops_t vdev_root_ops; 276 extern vdev_ops_t vdev_mirror_ops; 277 extern vdev_ops_t vdev_replacing_ops; 278 extern vdev_ops_t vdev_raidz_ops; 279 extern vdev_ops_t vdev_disk_ops; 280 extern vdev_ops_t vdev_file_ops; 281 extern vdev_ops_t vdev_missing_ops; 282 283 /* 284 * Common size functions 285 */ 286 extern uint64_t vdev_default_asize(vdev_t *vd, uint64_t psize); 287 extern uint64_t vdev_get_rsize(vdev_t *vd); 288 289 #ifdef __cplusplus 290 } 291 #endif 292 293 #endif /* _SYS_VDEV_IMPL_H */ 294