1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 5441d80aaSlling * Common Development and Distribution License (the "License"). 6441d80aaSlling * You may not use this file except in compliance with the License. 7fa9e4066Sahrens * 8fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 10fa9e4066Sahrens * See the License for the specific language governing permissions 11fa9e4066Sahrens * and limitations under the License. 12fa9e4066Sahrens * 13fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 14fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 16fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 17fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 18fa9e4066Sahrens * 19fa9e4066Sahrens * CDDL HEADER END 20fa9e4066Sahrens */ 21fa9e4066Sahrens /* 222264ca7fSLin Ling * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23fa9e4066Sahrens * Use is subject to license terms. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 26fa9e4066Sahrens #ifndef _SYS_VDEV_IMPL_H 27fa9e4066Sahrens #define _SYS_VDEV_IMPL_H 28fa9e4066Sahrens 29fa9e4066Sahrens #include <sys/avl.h> 30fa9e4066Sahrens #include <sys/dmu.h> 31fa9e4066Sahrens #include <sys/metaslab.h> 32fa9e4066Sahrens #include <sys/nvpair.h> 33fa9e4066Sahrens #include <sys/space_map.h> 34fa9e4066Sahrens #include <sys/vdev.h> 35fa9e4066Sahrens #include <sys/dkio.h> 36fa9e4066Sahrens #include <sys/uberblock_impl.h> 37fa9e4066Sahrens 38fa9e4066Sahrens #ifdef __cplusplus 39fa9e4066Sahrens extern "C" { 40fa9e4066Sahrens #endif 41fa9e4066Sahrens 42fa9e4066Sahrens /* 43fa9e4066Sahrens * Virtual device descriptors. 44fa9e4066Sahrens * 45fa9e4066Sahrens * All storage pool operations go through the virtual device framework, 46fa9e4066Sahrens * which provides data replication and I/O scheduling. 47fa9e4066Sahrens */ 48fa9e4066Sahrens 49fa9e4066Sahrens /* 50fa9e4066Sahrens * Forward declarations that lots of things need. 51fa9e4066Sahrens */ 52fa9e4066Sahrens typedef struct vdev_queue vdev_queue_t; 53fa9e4066Sahrens typedef struct vdev_cache vdev_cache_t; 54fa9e4066Sahrens typedef struct vdev_cache_entry vdev_cache_entry_t; 55fa9e4066Sahrens 56fa9e4066Sahrens /* 57fa9e4066Sahrens * Virtual device operations 58fa9e4066Sahrens */ 59fa9e4066Sahrens typedef int vdev_open_func_t(vdev_t *vd, uint64_t *size, uint64_t *ashift); 60fa9e4066Sahrens typedef void vdev_close_func_t(vdev_t *vd); 61fa9e4066Sahrens typedef uint64_t vdev_asize_func_t(vdev_t *vd, uint64_t psize); 62e05725b1Sbonwick typedef int vdev_io_start_func_t(zio_t *zio); 63e14bb325SJeff Bonwick typedef void vdev_io_done_func_t(zio_t *zio); 64fa9e4066Sahrens typedef void vdev_state_change_func_t(vdev_t *vd, int, int); 65fa9e4066Sahrens 66fa9e4066Sahrens typedef struct vdev_ops { 67fa9e4066Sahrens vdev_open_func_t *vdev_op_open; 68fa9e4066Sahrens vdev_close_func_t *vdev_op_close; 69fa9e4066Sahrens vdev_asize_func_t *vdev_op_asize; 70fa9e4066Sahrens vdev_io_start_func_t *vdev_op_io_start; 71fa9e4066Sahrens vdev_io_done_func_t *vdev_op_io_done; 72fa9e4066Sahrens vdev_state_change_func_t *vdev_op_state_change; 73fa9e4066Sahrens char vdev_op_type[16]; 74fa9e4066Sahrens boolean_t vdev_op_leaf; 75fa9e4066Sahrens } vdev_ops_t; 76fa9e4066Sahrens 77fa9e4066Sahrens /* 78fa9e4066Sahrens * Virtual device properties 79fa9e4066Sahrens */ 80fa9e4066Sahrens struct vdev_cache_entry { 81fa9e4066Sahrens char *ve_data; 82fa9e4066Sahrens uint64_t ve_offset; 83fa9e4066Sahrens uint64_t ve_lastused; 84fa9e4066Sahrens avl_node_t ve_offset_node; 85fa9e4066Sahrens avl_node_t ve_lastused_node; 86fa9e4066Sahrens uint32_t ve_hits; 87fa9e4066Sahrens uint16_t ve_missed_update; 88fa9e4066Sahrens zio_t *ve_fill_io; 89fa9e4066Sahrens }; 90fa9e4066Sahrens 91fa9e4066Sahrens struct vdev_cache { 92fa9e4066Sahrens avl_tree_t vc_offset_tree; 93fa9e4066Sahrens avl_tree_t vc_lastused_tree; 94fa9e4066Sahrens kmutex_t vc_lock; 95fa9e4066Sahrens }; 96fa9e4066Sahrens 97fa9e4066Sahrens struct vdev_queue { 98fa9e4066Sahrens avl_tree_t vq_deadline_tree; 99fa9e4066Sahrens avl_tree_t vq_read_tree; 100fa9e4066Sahrens avl_tree_t vq_write_tree; 101fa9e4066Sahrens avl_tree_t vq_pending_tree; 102fa9e4066Sahrens kmutex_t vq_lock; 103fa9e4066Sahrens }; 104fa9e4066Sahrens 105fa9e4066Sahrens /* 106fa9e4066Sahrens * Virtual device descriptor 107fa9e4066Sahrens */ 108fa9e4066Sahrens struct vdev { 109fa9e4066Sahrens /* 110fa9e4066Sahrens * Common to all vdev types. 111fa9e4066Sahrens */ 112fa9e4066Sahrens uint64_t vdev_id; /* child number in vdev parent */ 113fa9e4066Sahrens uint64_t vdev_guid; /* unique ID for this vdev */ 114fa9e4066Sahrens uint64_t vdev_guid_sum; /* self guid + all child guids */ 115fa9e4066Sahrens uint64_t vdev_asize; /* allocatable device capacity */ 116fa9e4066Sahrens uint64_t vdev_ashift; /* block alignment shift */ 117fa9e4066Sahrens uint64_t vdev_state; /* see VDEV_STATE_* #defines */ 118560e6e96Seschrock uint64_t vdev_prevstate; /* used when reopening a vdev */ 119fa9e4066Sahrens vdev_ops_t *vdev_ops; /* vdev operations */ 120fa9e4066Sahrens spa_t *vdev_spa; /* spa for this vdev */ 121fa9e4066Sahrens void *vdev_tsd; /* type-specific data */ 122fa9e4066Sahrens vdev_t *vdev_top; /* top-level vdev */ 123fa9e4066Sahrens vdev_t *vdev_parent; /* parent vdev */ 124fa9e4066Sahrens vdev_t **vdev_child; /* array of children */ 125fa9e4066Sahrens uint64_t vdev_children; /* number of children */ 1268ad4d6ddSJeff Bonwick space_map_t vdev_dtl[DTL_TYPES]; /* in-core dirty time logs */ 127fa9e4066Sahrens vdev_stat_t vdev_stat; /* virtual device statistics */ 128fa9e4066Sahrens 129fa9e4066Sahrens /* 130fa9e4066Sahrens * Top-level vdev state. 131fa9e4066Sahrens */ 132fa9e4066Sahrens uint64_t vdev_ms_array; /* metaslab array object */ 133fa9e4066Sahrens uint64_t vdev_ms_shift; /* metaslab size shift */ 134fa9e4066Sahrens uint64_t vdev_ms_count; /* number of metaslabs */ 135fa9e4066Sahrens metaslab_group_t *vdev_mg; /* metaslab group */ 136fa9e4066Sahrens metaslab_t **vdev_ms; /* metaslab array */ 137fa9e4066Sahrens txg_list_t vdev_ms_list; /* per-txg dirty metaslab lists */ 138fa9e4066Sahrens txg_list_t vdev_dtl_list; /* per-txg dirty DTL lists */ 139fa9e4066Sahrens txg_node_t vdev_txg_node; /* per-txg dirty vdev linkage */ 1403d7072f8Seschrock boolean_t vdev_remove_wanted; /* async remove wanted? */ 141e14bb325SJeff Bonwick boolean_t vdev_probe_wanted; /* async probe wanted? */ 142e14bb325SJeff Bonwick list_node_t vdev_config_dirty_node; /* config dirty list */ 143e14bb325SJeff Bonwick list_node_t vdev_state_dirty_node; /* state dirty list */ 14499653d4eSeschrock uint64_t vdev_deflate_ratio; /* deflation ratio (x512) */ 1458654d025Sperrin uint64_t vdev_islog; /* is an intent log device */ 146fa9e4066Sahrens 147fa9e4066Sahrens /* 148fa9e4066Sahrens * Leaf vdev state. 149fa9e4066Sahrens */ 150fa9e4066Sahrens uint64_t vdev_psize; /* physical device capacity */ 1518ad4d6ddSJeff Bonwick space_map_obj_t vdev_dtl_smo; /* dirty time log space map obj */ 152fa9e4066Sahrens txg_node_t vdev_dtl_node; /* per-txg dirty DTL linkage */ 153afefbcddSeschrock uint64_t vdev_wholedisk; /* true if this is a whole disk */ 1543d7072f8Seschrock uint64_t vdev_offline; /* persistent offline state */ 1553d7072f8Seschrock uint64_t vdev_faulted; /* persistent faulted state */ 1563d7072f8Seschrock uint64_t vdev_degraded; /* persistent degraded state */ 1573d7072f8Seschrock uint64_t vdev_removed; /* persistent removed state */ 15899653d4eSeschrock uint64_t vdev_nparity; /* number of parity devices for raidz */ 159fa9e4066Sahrens char *vdev_path; /* vdev path (if any) */ 160fa9e4066Sahrens char *vdev_devid; /* vdev devid (if any) */ 1613d7072f8Seschrock char *vdev_physpath; /* vdev device path (if any) */ 1626809eb4eSEric Schrock char *vdev_fru; /* physical FRU location */ 163e14bb325SJeff Bonwick uint64_t vdev_not_present; /* not present during import */ 164e14bb325SJeff Bonwick uint64_t vdev_unspare; /* unspare when resilvering done */ 165e14bb325SJeff Bonwick hrtime_t vdev_last_try; /* last reopen time */ 166e14bb325SJeff Bonwick boolean_t vdev_nowritecache; /* true if flushwritecache failed */ 167e14bb325SJeff Bonwick boolean_t vdev_checkremove; /* temporary online test */ 168e14bb325SJeff Bonwick boolean_t vdev_forcefault; /* force online fault */ 169441d80aaSlling uint8_t vdev_tmpoffline; /* device taken offline temporarily? */ 170fa9e4066Sahrens uint8_t vdev_detached; /* device detached? */ 171e14bb325SJeff Bonwick uint8_t vdev_cant_read; /* vdev is failing all reads */ 172e14bb325SJeff Bonwick uint8_t vdev_cant_write; /* vdev is failing all writes */ 1738654d025Sperrin uint64_t vdev_isspare; /* was a hot spare */ 174fa94a07fSbrendan uint64_t vdev_isl2cache; /* was a l2cache device */ 175fa9e4066Sahrens vdev_queue_t vdev_queue; /* I/O deadline schedule queue */ 176fa9e4066Sahrens vdev_cache_t vdev_cache; /* physical block cache */ 177c5904d13Seschrock spa_aux_vdev_t *vdev_aux; /* for l2cache vdevs */ 178e14bb325SJeff Bonwick zio_t *vdev_probe_zio; /* root of current probe */ 179fa9e4066Sahrens 180fa9e4066Sahrens /* 181fa9e4066Sahrens * For DTrace to work in userland (libzpool) context, these fields must 182fa9e4066Sahrens * remain at the end of the structure. DTrace will use the kernel's 183fa9e4066Sahrens * CTF definition for 'struct vdev', and since the size of a kmutex_t is 184fa9e4066Sahrens * larger in userland, the offsets for the rest fields would be 185fa9e4066Sahrens * incorrect. 186fa9e4066Sahrens */ 187fa9e4066Sahrens kmutex_t vdev_dtl_lock; /* vdev_dtl_{map,resilver} */ 188fa9e4066Sahrens kmutex_t vdev_stat_lock; /* vdev_stat */ 189e14bb325SJeff Bonwick kmutex_t vdev_probe_lock; /* protects vdev_probe_zio */ 190fa9e4066Sahrens }; 191fa9e4066Sahrens 192f83ffe1aSLin Ling #define VDEV_PAD_SIZE (8 << 10) 193f83ffe1aSLin Ling /* 2 padding areas (vl_pad1 and vl_pad2) to skip */ 194f83ffe1aSLin Ling #define VDEV_SKIP_SIZE VDEV_PAD_SIZE * 2 195fa9e4066Sahrens #define VDEV_PHYS_SIZE (112 << 10) 196ecc2d604Sbonwick #define VDEV_UBERBLOCK_RING (128 << 10) 197ecc2d604Sbonwick 198ecc2d604Sbonwick #define VDEV_UBERBLOCK_SHIFT(vd) \ 199ecc2d604Sbonwick MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT) 200ecc2d604Sbonwick #define VDEV_UBERBLOCK_COUNT(vd) \ 201ecc2d604Sbonwick (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd)) 202ecc2d604Sbonwick #define VDEV_UBERBLOCK_OFFSET(vd, n) \ 203ecc2d604Sbonwick offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)]) 204ecc2d604Sbonwick #define VDEV_UBERBLOCK_SIZE(vd) (1ULL << VDEV_UBERBLOCK_SHIFT(vd)) 205fa9e4066Sahrens 206fa9e4066Sahrens typedef struct vdev_phys { 207fa9e4066Sahrens char vp_nvlist[VDEV_PHYS_SIZE - sizeof (zio_block_tail_t)]; 208fa9e4066Sahrens zio_block_tail_t vp_zbt; 209fa9e4066Sahrens } vdev_phys_t; 210fa9e4066Sahrens 211fa9e4066Sahrens typedef struct vdev_label { 212f83ffe1aSLin Ling char vl_pad1[VDEV_PAD_SIZE]; /* 8K */ 213f83ffe1aSLin Ling char vl_pad2[VDEV_PAD_SIZE]; /* 8K */ 214ecc2d604Sbonwick vdev_phys_t vl_vdev_phys; /* 112K */ 215ecc2d604Sbonwick char vl_uberblock[VDEV_UBERBLOCK_RING]; /* 128K */ 216fa9e4066Sahrens } vdev_label_t; /* 256K total */ 217fa9e4066Sahrens 218ecc2d604Sbonwick /* 219ecc2d604Sbonwick * vdev_dirty() flags 220ecc2d604Sbonwick */ 221ecc2d604Sbonwick #define VDD_METASLAB 0x01 222ecc2d604Sbonwick #define VDD_DTL 0x02 223ecc2d604Sbonwick 224fa9e4066Sahrens /* 225fa9e4066Sahrens * Size and offset of embedded boot loader region on each label. 226fa9e4066Sahrens * The total size of the first two labels plus the boot area is 4MB. 227fa9e4066Sahrens */ 228fa9e4066Sahrens #define VDEV_BOOT_OFFSET (2 * sizeof (vdev_label_t)) 229fa9e4066Sahrens #define VDEV_BOOT_SIZE (7ULL << 19) /* 3.5M */ 230fa9e4066Sahrens 231fa9e4066Sahrens /* 232fa9e4066Sahrens * Size of label regions at the start and end of each leaf device. 233fa9e4066Sahrens */ 234fa9e4066Sahrens #define VDEV_LABEL_START_SIZE (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE) 235fa9e4066Sahrens #define VDEV_LABEL_END_SIZE (2 * sizeof (vdev_label_t)) 236fa9e4066Sahrens #define VDEV_LABELS 4 237fa9e4066Sahrens 238fa9e4066Sahrens #define VDEV_ALLOC_LOAD 0 239fa9e4066Sahrens #define VDEV_ALLOC_ADD 1 24099653d4eSeschrock #define VDEV_ALLOC_SPARE 2 241fa94a07fSbrendan #define VDEV_ALLOC_L2CACHE 3 242*21ecdf64SLin Ling #define VDEV_ALLOC_ROOTPOOL 4 243fa9e4066Sahrens 244fa9e4066Sahrens /* 245fa9e4066Sahrens * Allocate or free a vdev 246fa9e4066Sahrens */ 24799653d4eSeschrock extern int vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *config, 24899653d4eSeschrock vdev_t *parent, uint_t id, int alloctype); 249fa9e4066Sahrens extern void vdev_free(vdev_t *vd); 250fa9e4066Sahrens 251fa9e4066Sahrens /* 252fa9e4066Sahrens * Add or remove children and parents 253fa9e4066Sahrens */ 254fa9e4066Sahrens extern void vdev_add_child(vdev_t *pvd, vdev_t *cvd); 255fa9e4066Sahrens extern void vdev_remove_child(vdev_t *pvd, vdev_t *cvd); 256fa9e4066Sahrens extern void vdev_compact_children(vdev_t *pvd); 257fa9e4066Sahrens extern vdev_t *vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops); 258fa9e4066Sahrens extern void vdev_remove_parent(vdev_t *cvd); 259fa9e4066Sahrens 260fa9e4066Sahrens /* 261fa9e4066Sahrens * vdev sync load and sync 262fa9e4066Sahrens */ 263e6ca193dSGeorge Wilson extern void vdev_load_log_state(vdev_t *vd, nvlist_t *nv); 264560e6e96Seschrock extern void vdev_load(vdev_t *vd); 265fa9e4066Sahrens extern void vdev_sync(vdev_t *vd, uint64_t txg); 266fa9e4066Sahrens extern void vdev_sync_done(vdev_t *vd, uint64_t txg); 267ecc2d604Sbonwick extern void vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg); 268fa9e4066Sahrens 269fa9e4066Sahrens /* 270fa9e4066Sahrens * Available vdev types. 271fa9e4066Sahrens */ 272fa9e4066Sahrens extern vdev_ops_t vdev_root_ops; 273fa9e4066Sahrens extern vdev_ops_t vdev_mirror_ops; 274fa9e4066Sahrens extern vdev_ops_t vdev_replacing_ops; 275fa9e4066Sahrens extern vdev_ops_t vdev_raidz_ops; 276fa9e4066Sahrens extern vdev_ops_t vdev_disk_ops; 277fa9e4066Sahrens extern vdev_ops_t vdev_file_ops; 278fa9e4066Sahrens extern vdev_ops_t vdev_missing_ops; 27999653d4eSeschrock extern vdev_ops_t vdev_spare_ops; 280fa9e4066Sahrens 281fa9e4066Sahrens /* 2822a79c5feSlling * Common size functions 283fa9e4066Sahrens */ 284fa9e4066Sahrens extern uint64_t vdev_default_asize(vdev_t *vd, uint64_t psize); 2852a79c5feSlling extern uint64_t vdev_get_rsize(vdev_t *vd); 286fa9e4066Sahrens 287e81c57b1Sahrens /* 288e81c57b1Sahrens * zdb uses this tunable, so it must be declared here to make lint happy. 289e81c57b1Sahrens */ 290e81c57b1Sahrens extern int zfs_vdev_cache_size; 291e81c57b1Sahrens 292fa9e4066Sahrens #ifdef __cplusplus 293fa9e4066Sahrens } 294fa9e4066Sahrens #endif 295fa9e4066Sahrens 296fa9e4066Sahrens #endif /* _SYS_VDEV_IMPL_H */ 297