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 /* 2298d1cbfeSGeorge Wilson * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 234263d13fSGeorge Wilson * Copyright (c) 2012 by Delphix. All rights reserved. 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 */ 594263d13fSGeorge Wilson typedef int vdev_open_func_t(vdev_t *vd, uint64_t *size, uint64_t *max_size, 604263d13fSGeorge Wilson uint64_t *ashift); 61fa9e4066Sahrens typedef void vdev_close_func_t(vdev_t *vd); 62fa9e4066Sahrens typedef uint64_t vdev_asize_func_t(vdev_t *vd, uint64_t psize); 63e05725b1Sbonwick typedef int vdev_io_start_func_t(zio_t *zio); 64e14bb325SJeff Bonwick typedef void vdev_io_done_func_t(zio_t *zio); 65fa9e4066Sahrens typedef void vdev_state_change_func_t(vdev_t *vd, int, int); 66dcba9f3fSGeorge Wilson typedef void vdev_hold_func_t(vdev_t *vd); 67dcba9f3fSGeorge Wilson typedef void vdev_rele_func_t(vdev_t *vd); 68fa9e4066Sahrens 69fa9e4066Sahrens typedef struct vdev_ops { 70fa9e4066Sahrens vdev_open_func_t *vdev_op_open; 71fa9e4066Sahrens vdev_close_func_t *vdev_op_close; 72fa9e4066Sahrens vdev_asize_func_t *vdev_op_asize; 73fa9e4066Sahrens vdev_io_start_func_t *vdev_op_io_start; 74fa9e4066Sahrens vdev_io_done_func_t *vdev_op_io_done; 75fa9e4066Sahrens vdev_state_change_func_t *vdev_op_state_change; 76dcba9f3fSGeorge Wilson vdev_hold_func_t *vdev_op_hold; 77dcba9f3fSGeorge Wilson vdev_rele_func_t *vdev_op_rele; 78fa9e4066Sahrens char vdev_op_type[16]; 79fa9e4066Sahrens boolean_t vdev_op_leaf; 80fa9e4066Sahrens } vdev_ops_t; 81fa9e4066Sahrens 82fa9e4066Sahrens /* 83fa9e4066Sahrens * Virtual device properties 84fa9e4066Sahrens */ 85fa9e4066Sahrens struct vdev_cache_entry { 86fa9e4066Sahrens char *ve_data; 87fa9e4066Sahrens uint64_t ve_offset; 88fa9e4066Sahrens uint64_t ve_lastused; 89fa9e4066Sahrens avl_node_t ve_offset_node; 90fa9e4066Sahrens avl_node_t ve_lastused_node; 91fa9e4066Sahrens uint32_t ve_hits; 92fa9e4066Sahrens uint16_t ve_missed_update; 93fa9e4066Sahrens zio_t *ve_fill_io; 94fa9e4066Sahrens }; 95fa9e4066Sahrens 96fa9e4066Sahrens struct vdev_cache { 97fa9e4066Sahrens avl_tree_t vc_offset_tree; 98fa9e4066Sahrens avl_tree_t vc_lastused_tree; 99fa9e4066Sahrens kmutex_t vc_lock; 100fa9e4066Sahrens }; 101fa9e4066Sahrens 102fa9e4066Sahrens struct vdev_queue { 103fa9e4066Sahrens avl_tree_t vq_deadline_tree; 104fa9e4066Sahrens avl_tree_t vq_read_tree; 105fa9e4066Sahrens avl_tree_t vq_write_tree; 106fa9e4066Sahrens avl_tree_t vq_pending_tree; 107283b8460SGeorge.Wilson uint64_t vq_io_complete_ts; 108283b8460SGeorge.Wilson uint64_t vq_io_delta_ts; 109fa9e4066Sahrens kmutex_t vq_lock; 110fa9e4066Sahrens }; 111fa9e4066Sahrens 112fa9e4066Sahrens /* 113fa9e4066Sahrens * Virtual device descriptor 114fa9e4066Sahrens */ 115fa9e4066Sahrens struct vdev { 116fa9e4066Sahrens /* 117fa9e4066Sahrens * Common to all vdev types. 118fa9e4066Sahrens */ 119fa9e4066Sahrens uint64_t vdev_id; /* child number in vdev parent */ 120fa9e4066Sahrens uint64_t vdev_guid; /* unique ID for this vdev */ 121fa9e4066Sahrens uint64_t vdev_guid_sum; /* self guid + all child guids */ 1221195e687SMark J Musante uint64_t vdev_orig_guid; /* orig. guid prior to remove */ 123fa9e4066Sahrens uint64_t vdev_asize; /* allocatable device capacity */ 124573ca77eSGeorge Wilson uint64_t vdev_min_asize; /* min acceptable asize */ 1254263d13fSGeorge Wilson uint64_t vdev_max_asize; /* max acceptable asize */ 126fa9e4066Sahrens uint64_t vdev_ashift; /* block alignment shift */ 127fa9e4066Sahrens uint64_t vdev_state; /* see VDEV_STATE_* #defines */ 128560e6e96Seschrock uint64_t vdev_prevstate; /* used when reopening a vdev */ 129fa9e4066Sahrens vdev_ops_t *vdev_ops; /* vdev operations */ 130fa9e4066Sahrens spa_t *vdev_spa; /* spa for this vdev */ 131fa9e4066Sahrens void *vdev_tsd; /* type-specific data */ 132dcba9f3fSGeorge Wilson vnode_t *vdev_name_vp; /* vnode for pathname */ 133dcba9f3fSGeorge Wilson vnode_t *vdev_devid_vp; /* vnode for devid */ 134fa9e4066Sahrens vdev_t *vdev_top; /* top-level vdev */ 135fa9e4066Sahrens vdev_t *vdev_parent; /* parent vdev */ 136fa9e4066Sahrens vdev_t **vdev_child; /* array of children */ 137fa9e4066Sahrens uint64_t vdev_children; /* number of children */ 1388ad4d6ddSJeff Bonwick space_map_t vdev_dtl[DTL_TYPES]; /* in-core dirty time logs */ 139fa9e4066Sahrens vdev_stat_t vdev_stat; /* virtual device statistics */ 140573ca77eSGeorge Wilson boolean_t vdev_expanding; /* expand the vdev? */ 141095bcd66SGeorge Wilson boolean_t vdev_reopening; /* reopen in progress? */ 142f64c0e34SEric Taylor int vdev_open_error; /* error on last open */ 143f64c0e34SEric Taylor kthread_t *vdev_open_thread; /* thread opening children */ 14488ecc943SGeorge Wilson uint64_t vdev_crtxg; /* txg when top-level was added */ 145fa9e4066Sahrens 146fa9e4066Sahrens /* 147fa9e4066Sahrens * Top-level vdev state. 148fa9e4066Sahrens */ 149fa9e4066Sahrens uint64_t vdev_ms_array; /* metaslab array object */ 150fa9e4066Sahrens uint64_t vdev_ms_shift; /* metaslab size shift */ 151fa9e4066Sahrens uint64_t vdev_ms_count; /* number of metaslabs */ 152fa9e4066Sahrens metaslab_group_t *vdev_mg; /* metaslab group */ 153fa9e4066Sahrens metaslab_t **vdev_ms; /* metaslab array */ 154fa9e4066Sahrens txg_list_t vdev_ms_list; /* per-txg dirty metaslab lists */ 155fa9e4066Sahrens txg_list_t vdev_dtl_list; /* per-txg dirty DTL lists */ 156fa9e4066Sahrens txg_node_t vdev_txg_node; /* per-txg dirty vdev linkage */ 1573d7072f8Seschrock boolean_t vdev_remove_wanted; /* async remove wanted? */ 158e14bb325SJeff Bonwick boolean_t vdev_probe_wanted; /* async probe wanted? */ 1593f9d6ad7SLin Ling uint64_t vdev_removing; /* device is being removed? */ 160e14bb325SJeff Bonwick list_node_t vdev_config_dirty_node; /* config dirty list */ 161e14bb325SJeff Bonwick list_node_t vdev_state_dirty_node; /* state dirty list */ 16299653d4eSeschrock uint64_t vdev_deflate_ratio; /* deflation ratio (x512) */ 1638654d025Sperrin uint64_t vdev_islog; /* is an intent log device */ 16488ecc943SGeorge Wilson uint64_t vdev_ishole; /* is a hole in the namespace */ 165fa9e4066Sahrens 166fa9e4066Sahrens /* 167fa9e4066Sahrens * Leaf vdev state. 168fa9e4066Sahrens */ 169fa9e4066Sahrens uint64_t vdev_psize; /* physical device capacity */ 1708ad4d6ddSJeff Bonwick space_map_obj_t vdev_dtl_smo; /* dirty time log space map obj */ 171fa9e4066Sahrens txg_node_t vdev_dtl_node; /* per-txg dirty DTL linkage */ 172afefbcddSeschrock uint64_t vdev_wholedisk; /* true if this is a whole disk */ 1733d7072f8Seschrock uint64_t vdev_offline; /* persistent offline state */ 1743d7072f8Seschrock uint64_t vdev_faulted; /* persistent faulted state */ 1753d7072f8Seschrock uint64_t vdev_degraded; /* persistent degraded state */ 1763d7072f8Seschrock uint64_t vdev_removed; /* persistent removed state */ 177cb04b873SMark J Musante uint64_t vdev_resilvering; /* persistent resilvering state */ 17899653d4eSeschrock uint64_t vdev_nparity; /* number of parity devices for raidz */ 179fa9e4066Sahrens char *vdev_path; /* vdev path (if any) */ 180fa9e4066Sahrens char *vdev_devid; /* vdev devid (if any) */ 1813d7072f8Seschrock char *vdev_physpath; /* vdev device path (if any) */ 1826809eb4eSEric Schrock char *vdev_fru; /* physical FRU location */ 183e14bb325SJeff Bonwick uint64_t vdev_not_present; /* not present during import */ 184e14bb325SJeff Bonwick uint64_t vdev_unspare; /* unspare when resilvering done */ 185e14bb325SJeff Bonwick hrtime_t vdev_last_try; /* last reopen time */ 186e14bb325SJeff Bonwick boolean_t vdev_nowritecache; /* true if flushwritecache failed */ 187e14bb325SJeff Bonwick boolean_t vdev_checkremove; /* temporary online test */ 188e14bb325SJeff Bonwick boolean_t vdev_forcefault; /* force online fault */ 1891195e687SMark J Musante boolean_t vdev_splitting; /* split or repair in progress */ 19098d1cbfeSGeorge Wilson boolean_t vdev_delayed_close; /* delayed device close? */ 191441d80aaSlling uint8_t vdev_tmpoffline; /* device taken offline temporarily? */ 192fa9e4066Sahrens uint8_t vdev_detached; /* device detached? */ 193e14bb325SJeff Bonwick uint8_t vdev_cant_read; /* vdev is failing all reads */ 194e14bb325SJeff Bonwick uint8_t vdev_cant_write; /* vdev is failing all writes */ 19599653d4eSeschrock uint64_t vdev_isspare; /* was a hot spare */ 196fa94a07fSbrendan uint64_t vdev_isl2cache; /* was a l2cache device */ 197fa9e4066Sahrens vdev_queue_t vdev_queue; /* I/O deadline schedule queue */ 198fa9e4066Sahrens vdev_cache_t vdev_cache; /* physical block cache */ 199c5904d13Seschrock spa_aux_vdev_t *vdev_aux; /* for l2cache vdevs */ 200e14bb325SJeff Bonwick zio_t *vdev_probe_zio; /* root of current probe */ 201069f55e2SEric Schrock vdev_aux_t vdev_label_aux; /* on-disk aux state */ 202fa9e4066Sahrens 203fa9e4066Sahrens /* 204fa9e4066Sahrens * For DTrace to work in userland (libzpool) context, these fields must 205fa9e4066Sahrens * remain at the end of the structure. DTrace will use the kernel's 206fa9e4066Sahrens * CTF definition for 'struct vdev', and since the size of a kmutex_t is 207ad135b5dSChristopher Siden * larger in userland, the offsets for the rest of the fields would be 208fa9e4066Sahrens * incorrect. 209fa9e4066Sahrens */ 210fa9e4066Sahrens kmutex_t vdev_dtl_lock; /* vdev_dtl_{map,resilver} */ 211fa9e4066Sahrens kmutex_t vdev_stat_lock; /* vdev_stat */ 212e14bb325SJeff Bonwick kmutex_t vdev_probe_lock; /* protects vdev_probe_zio */ 213fa9e4066Sahrens }; 214fa9e4066Sahrens 215b24ab676SJeff Bonwick #define VDEV_RAIDZ_MAXPARITY 3 216b24ab676SJeff Bonwick 217f83ffe1aSLin Ling #define VDEV_PAD_SIZE (8 << 10) 218f83ffe1aSLin Ling /* 2 padding areas (vl_pad1 and vl_pad2) to skip */ 219f83ffe1aSLin Ling #define VDEV_SKIP_SIZE VDEV_PAD_SIZE * 2 220fa9e4066Sahrens #define VDEV_PHYS_SIZE (112 << 10) 221ecc2d604Sbonwick #define VDEV_UBERBLOCK_RING (128 << 10) 222ecc2d604Sbonwick 223ecc2d604Sbonwick #define VDEV_UBERBLOCK_SHIFT(vd) \ 224ecc2d604Sbonwick MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT) 225ecc2d604Sbonwick #define VDEV_UBERBLOCK_COUNT(vd) \ 226ecc2d604Sbonwick (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd)) 227ecc2d604Sbonwick #define VDEV_UBERBLOCK_OFFSET(vd, n) \ 228ecc2d604Sbonwick offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)]) 229ecc2d604Sbonwick #define VDEV_UBERBLOCK_SIZE(vd) (1ULL << VDEV_UBERBLOCK_SHIFT(vd)) 230fa9e4066Sahrens 231fa9e4066Sahrens typedef struct vdev_phys { 2326e1f5caaSNeil Perrin char vp_nvlist[VDEV_PHYS_SIZE - sizeof (zio_eck_t)]; 2336e1f5caaSNeil Perrin zio_eck_t vp_zbt; 234fa9e4066Sahrens } vdev_phys_t; 235fa9e4066Sahrens 236fa9e4066Sahrens typedef struct vdev_label { 237f83ffe1aSLin Ling char vl_pad1[VDEV_PAD_SIZE]; /* 8K */ 238f83ffe1aSLin Ling char vl_pad2[VDEV_PAD_SIZE]; /* 8K */ 2393dd27b57Stabriz vdev_phys_t vl_vdev_phys; /* 112K */ 240ecc2d604Sbonwick char vl_uberblock[VDEV_UBERBLOCK_RING]; /* 128K */ 241fa9e4066Sahrens } vdev_label_t; /* 256K total */ 242fa9e4066Sahrens 243fa9e4066Sahrens /* 244ecc2d604Sbonwick * vdev_dirty() flags 245ecc2d604Sbonwick */ 246ecc2d604Sbonwick #define VDD_METASLAB 0x01 247ecc2d604Sbonwick #define VDD_DTL 0x02 248ecc2d604Sbonwick 249ecc2d604Sbonwick /* 250fa9e4066Sahrens * Size and offset of embedded boot loader region on each label. 251fa9e4066Sahrens * The total size of the first two labels plus the boot area is 4MB. 252fa9e4066Sahrens */ 253fa9e4066Sahrens #define VDEV_BOOT_OFFSET (2 * sizeof (vdev_label_t)) 254fa9e4066Sahrens #define VDEV_BOOT_SIZE (7ULL << 19) /* 3.5M */ 255fa9e4066Sahrens 256fa9e4066Sahrens /* 257fa9e4066Sahrens * Size of label regions at the start and end of each leaf device. 258fa9e4066Sahrens */ 259fa9e4066Sahrens #define VDEV_LABEL_START_SIZE (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE) 260fa9e4066Sahrens #define VDEV_LABEL_END_SIZE (2 * sizeof (vdev_label_t)) 261fa9e4066Sahrens #define VDEV_LABELS 4 262ad135b5dSChristopher Siden #define VDEV_BEST_LABEL VDEV_LABELS 263fa9e4066Sahrens 264fa9e4066Sahrens #define VDEV_ALLOC_LOAD 0 265fa9e4066Sahrens #define VDEV_ALLOC_ADD 1 26699653d4eSeschrock #define VDEV_ALLOC_SPARE 2 267fa94a07fSbrendan #define VDEV_ALLOC_L2CACHE 3 26821ecdf64SLin Ling #define VDEV_ALLOC_ROOTPOOL 4 2691195e687SMark J Musante #define VDEV_ALLOC_SPLIT 5 270cd0837ccSGeorge Wilson #define VDEV_ALLOC_ATTACH 6 271fa9e4066Sahrens 272fa9e4066Sahrens /* 273fa9e4066Sahrens * Allocate or free a vdev 274fa9e4066Sahrens */ 27588ecc943SGeorge Wilson extern vdev_t *vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid, 27688ecc943SGeorge Wilson vdev_ops_t *ops); 27799653d4eSeschrock extern int vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *config, 27899653d4eSeschrock vdev_t *parent, uint_t id, int alloctype); 279fa9e4066Sahrens extern void vdev_free(vdev_t *vd); 280fa9e4066Sahrens 281fa9e4066Sahrens /* 282fa9e4066Sahrens * Add or remove children and parents 283fa9e4066Sahrens */ 284fa9e4066Sahrens extern void vdev_add_child(vdev_t *pvd, vdev_t *cvd); 285fa9e4066Sahrens extern void vdev_remove_child(vdev_t *pvd, vdev_t *cvd); 286fa9e4066Sahrens extern void vdev_compact_children(vdev_t *pvd); 287fa9e4066Sahrens extern vdev_t *vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops); 288fa9e4066Sahrens extern void vdev_remove_parent(vdev_t *cvd); 289fa9e4066Sahrens 290fa9e4066Sahrens /* 291fa9e4066Sahrens * vdev sync load and sync 292fa9e4066Sahrens */ 29388ecc943SGeorge Wilson extern void vdev_load_log_state(vdev_t *nvd, vdev_t *ovd); 2944b964adaSGeorge Wilson extern boolean_t vdev_log_state_valid(vdev_t *vd); 295560e6e96Seschrock extern void vdev_load(vdev_t *vd); 296fa9e4066Sahrens extern void vdev_sync(vdev_t *vd, uint64_t txg); 297fa9e4066Sahrens extern void vdev_sync_done(vdev_t *vd, uint64_t txg); 298ecc2d604Sbonwick extern void vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg); 299fa9e4066Sahrens 300fa9e4066Sahrens /* 301fa9e4066Sahrens * Available vdev types. 302fa9e4066Sahrens */ 303fa9e4066Sahrens extern vdev_ops_t vdev_root_ops; 304fa9e4066Sahrens extern vdev_ops_t vdev_mirror_ops; 305fa9e4066Sahrens extern vdev_ops_t vdev_replacing_ops; 306fa9e4066Sahrens extern vdev_ops_t vdev_raidz_ops; 307fa9e4066Sahrens extern vdev_ops_t vdev_disk_ops; 308fa9e4066Sahrens extern vdev_ops_t vdev_file_ops; 309fa9e4066Sahrens extern vdev_ops_t vdev_missing_ops; 31088ecc943SGeorge Wilson extern vdev_ops_t vdev_hole_ops; 31199653d4eSeschrock extern vdev_ops_t vdev_spare_ops; 312fa9e4066Sahrens 313fa9e4066Sahrens /* 3142a79c5feSlling * Common size functions 315fa9e4066Sahrens */ 316fa9e4066Sahrens extern uint64_t vdev_default_asize(vdev_t *vd, uint64_t psize); 317573ca77eSGeorge Wilson extern uint64_t vdev_get_min_asize(vdev_t *vd); 318573ca77eSGeorge Wilson extern void vdev_set_min_asize(vdev_t *vd); 319fa9e4066Sahrens 320e81c57b1Sahrens /* 321e81c57b1Sahrens * zdb uses this tunable, so it must be declared here to make lint happy. 322e81c57b1Sahrens */ 323e81c57b1Sahrens extern int zfs_vdev_cache_size; 324e81c57b1Sahrens 325*31d7e8faSGeorge Wilson /* 326*31d7e8faSGeorge Wilson * The vdev_buf_t is used to translate between zio_t and buf_t, and back again. 327*31d7e8faSGeorge Wilson */ 328*31d7e8faSGeorge Wilson typedef struct vdev_buf { 329*31d7e8faSGeorge Wilson buf_t vb_buf; /* buffer that describes the io */ 330*31d7e8faSGeorge Wilson zio_t *vb_io; /* pointer back to the original zio_t */ 331*31d7e8faSGeorge Wilson } vdev_buf_t; 332*31d7e8faSGeorge Wilson 333fa9e4066Sahrens #ifdef __cplusplus 334fa9e4066Sahrens } 335fa9e4066Sahrens #endif 336fa9e4066Sahrens 337fa9e4066Sahrens #endif /* _SYS_VDEV_IMPL_H */ 338