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; 107fa9e4066Sahrens kmutex_t vq_lock; 108fa9e4066Sahrens }; 109fa9e4066Sahrens 110fa9e4066Sahrens /* 111fa9e4066Sahrens * Virtual device descriptor 112fa9e4066Sahrens */ 113fa9e4066Sahrens struct vdev { 114fa9e4066Sahrens /* 115fa9e4066Sahrens * Common to all vdev types. 116fa9e4066Sahrens */ 117fa9e4066Sahrens uint64_t vdev_id; /* child number in vdev parent */ 118fa9e4066Sahrens uint64_t vdev_guid; /* unique ID for this vdev */ 119fa9e4066Sahrens uint64_t vdev_guid_sum; /* self guid + all child guids */ 1201195e687SMark J Musante uint64_t vdev_orig_guid; /* orig. guid prior to remove */ 121fa9e4066Sahrens uint64_t vdev_asize; /* allocatable device capacity */ 122573ca77eSGeorge Wilson uint64_t vdev_min_asize; /* min acceptable asize */ 1234263d13fSGeorge Wilson uint64_t vdev_max_asize; /* max acceptable asize */ 124fa9e4066Sahrens uint64_t vdev_ashift; /* block alignment shift */ 125fa9e4066Sahrens uint64_t vdev_state; /* see VDEV_STATE_* #defines */ 126560e6e96Seschrock uint64_t vdev_prevstate; /* used when reopening a vdev */ 127fa9e4066Sahrens vdev_ops_t *vdev_ops; /* vdev operations */ 128fa9e4066Sahrens spa_t *vdev_spa; /* spa for this vdev */ 129fa9e4066Sahrens void *vdev_tsd; /* type-specific data */ 130dcba9f3fSGeorge Wilson vnode_t *vdev_name_vp; /* vnode for pathname */ 131dcba9f3fSGeorge Wilson vnode_t *vdev_devid_vp; /* vnode for devid */ 132fa9e4066Sahrens vdev_t *vdev_top; /* top-level vdev */ 133fa9e4066Sahrens vdev_t *vdev_parent; /* parent vdev */ 134fa9e4066Sahrens vdev_t **vdev_child; /* array of children */ 135fa9e4066Sahrens uint64_t vdev_children; /* number of children */ 1368ad4d6ddSJeff Bonwick space_map_t vdev_dtl[DTL_TYPES]; /* in-core dirty time logs */ 137fa9e4066Sahrens vdev_stat_t vdev_stat; /* virtual device statistics */ 138573ca77eSGeorge Wilson boolean_t vdev_expanding; /* expand the vdev? */ 139095bcd66SGeorge Wilson boolean_t vdev_reopening; /* reopen in progress? */ 140f64c0e34SEric Taylor int vdev_open_error; /* error on last open */ 141f64c0e34SEric Taylor kthread_t *vdev_open_thread; /* thread opening children */ 14288ecc943SGeorge Wilson uint64_t vdev_crtxg; /* txg when top-level was added */ 143fa9e4066Sahrens 144fa9e4066Sahrens /* 145fa9e4066Sahrens * Top-level vdev state. 146fa9e4066Sahrens */ 147fa9e4066Sahrens uint64_t vdev_ms_array; /* metaslab array object */ 148fa9e4066Sahrens uint64_t vdev_ms_shift; /* metaslab size shift */ 149fa9e4066Sahrens uint64_t vdev_ms_count; /* number of metaslabs */ 150fa9e4066Sahrens metaslab_group_t *vdev_mg; /* metaslab group */ 151fa9e4066Sahrens metaslab_t **vdev_ms; /* metaslab array */ 152fa9e4066Sahrens txg_list_t vdev_ms_list; /* per-txg dirty metaslab lists */ 153fa9e4066Sahrens txg_list_t vdev_dtl_list; /* per-txg dirty DTL lists */ 154fa9e4066Sahrens txg_node_t vdev_txg_node; /* per-txg dirty vdev linkage */ 1553d7072f8Seschrock boolean_t vdev_remove_wanted; /* async remove wanted? */ 156e14bb325SJeff Bonwick boolean_t vdev_probe_wanted; /* async probe wanted? */ 1573f9d6ad7SLin Ling uint64_t vdev_removing; /* device is being removed? */ 158e14bb325SJeff Bonwick list_node_t vdev_config_dirty_node; /* config dirty list */ 159e14bb325SJeff Bonwick list_node_t vdev_state_dirty_node; /* state dirty list */ 16099653d4eSeschrock uint64_t vdev_deflate_ratio; /* deflation ratio (x512) */ 1618654d025Sperrin uint64_t vdev_islog; /* is an intent log device */ 16288ecc943SGeorge Wilson uint64_t vdev_ishole; /* is a hole in the namespace */ 163fa9e4066Sahrens 164fa9e4066Sahrens /* 165fa9e4066Sahrens * Leaf vdev state. 166fa9e4066Sahrens */ 167fa9e4066Sahrens uint64_t vdev_psize; /* physical device capacity */ 1688ad4d6ddSJeff Bonwick space_map_obj_t vdev_dtl_smo; /* dirty time log space map obj */ 169fa9e4066Sahrens txg_node_t vdev_dtl_node; /* per-txg dirty DTL linkage */ 170afefbcddSeschrock uint64_t vdev_wholedisk; /* true if this is a whole disk */ 1713d7072f8Seschrock uint64_t vdev_offline; /* persistent offline state */ 1723d7072f8Seschrock uint64_t vdev_faulted; /* persistent faulted state */ 1733d7072f8Seschrock uint64_t vdev_degraded; /* persistent degraded state */ 1743d7072f8Seschrock uint64_t vdev_removed; /* persistent removed state */ 175cb04b873SMark J Musante uint64_t vdev_resilvering; /* persistent resilvering state */ 17699653d4eSeschrock uint64_t vdev_nparity; /* number of parity devices for raidz */ 177fa9e4066Sahrens char *vdev_path; /* vdev path (if any) */ 178fa9e4066Sahrens char *vdev_devid; /* vdev devid (if any) */ 1793d7072f8Seschrock char *vdev_physpath; /* vdev device path (if any) */ 1806809eb4eSEric Schrock char *vdev_fru; /* physical FRU location */ 181e14bb325SJeff Bonwick uint64_t vdev_not_present; /* not present during import */ 182e14bb325SJeff Bonwick uint64_t vdev_unspare; /* unspare when resilvering done */ 183e14bb325SJeff Bonwick hrtime_t vdev_last_try; /* last reopen time */ 184e14bb325SJeff Bonwick boolean_t vdev_nowritecache; /* true if flushwritecache failed */ 185e14bb325SJeff Bonwick boolean_t vdev_checkremove; /* temporary online test */ 186e14bb325SJeff Bonwick boolean_t vdev_forcefault; /* force online fault */ 1871195e687SMark J Musante boolean_t vdev_splitting; /* split or repair in progress */ 18898d1cbfeSGeorge Wilson boolean_t vdev_delayed_close; /* delayed device close? */ 189441d80aaSlling uint8_t vdev_tmpoffline; /* device taken offline temporarily? */ 190fa9e4066Sahrens uint8_t vdev_detached; /* device detached? */ 191e14bb325SJeff Bonwick uint8_t vdev_cant_read; /* vdev is failing all reads */ 192e14bb325SJeff Bonwick uint8_t vdev_cant_write; /* vdev is failing all writes */ 1938654d025Sperrin uint64_t vdev_isspare; /* was a hot spare */ 194fa94a07fSbrendan uint64_t vdev_isl2cache; /* was a l2cache device */ 195fa9e4066Sahrens vdev_queue_t vdev_queue; /* I/O deadline schedule queue */ 196fa9e4066Sahrens vdev_cache_t vdev_cache; /* physical block cache */ 197c5904d13Seschrock spa_aux_vdev_t *vdev_aux; /* for l2cache vdevs */ 198e14bb325SJeff Bonwick zio_t *vdev_probe_zio; /* root of current probe */ 199069f55e2SEric Schrock vdev_aux_t vdev_label_aux; /* on-disk aux state */ 200fa9e4066Sahrens 201fa9e4066Sahrens /* 202fa9e4066Sahrens * For DTrace to work in userland (libzpool) context, these fields must 203fa9e4066Sahrens * remain at the end of the structure. DTrace will use the kernel's 204fa9e4066Sahrens * CTF definition for 'struct vdev', and since the size of a kmutex_t is 205fa9e4066Sahrens * larger in userland, the offsets for the rest fields would be 206fa9e4066Sahrens * incorrect. 207fa9e4066Sahrens */ 208fa9e4066Sahrens kmutex_t vdev_dtl_lock; /* vdev_dtl_{map,resilver} */ 209fa9e4066Sahrens kmutex_t vdev_stat_lock; /* vdev_stat */ 210e14bb325SJeff Bonwick kmutex_t vdev_probe_lock; /* protects vdev_probe_zio */ 211fa9e4066Sahrens }; 212fa9e4066Sahrens 213b24ab676SJeff Bonwick #define VDEV_RAIDZ_MAXPARITY 3 214b24ab676SJeff Bonwick 215f83ffe1aSLin Ling #define VDEV_PAD_SIZE (8 << 10) 216f83ffe1aSLin Ling /* 2 padding areas (vl_pad1 and vl_pad2) to skip */ 217f83ffe1aSLin Ling #define VDEV_SKIP_SIZE VDEV_PAD_SIZE * 2 218fa9e4066Sahrens #define VDEV_PHYS_SIZE (112 << 10) 219ecc2d604Sbonwick #define VDEV_UBERBLOCK_RING (128 << 10) 220ecc2d604Sbonwick 221ecc2d604Sbonwick #define VDEV_UBERBLOCK_SHIFT(vd) \ 222ecc2d604Sbonwick MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT) 223ecc2d604Sbonwick #define VDEV_UBERBLOCK_COUNT(vd) \ 224ecc2d604Sbonwick (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd)) 225ecc2d604Sbonwick #define VDEV_UBERBLOCK_OFFSET(vd, n) \ 226ecc2d604Sbonwick offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)]) 227ecc2d604Sbonwick #define VDEV_UBERBLOCK_SIZE(vd) (1ULL << VDEV_UBERBLOCK_SHIFT(vd)) 228fa9e4066Sahrens 229fa9e4066Sahrens typedef struct vdev_phys { 2306e1f5caaSNeil Perrin char vp_nvlist[VDEV_PHYS_SIZE - sizeof (zio_eck_t)]; 2316e1f5caaSNeil Perrin zio_eck_t vp_zbt; 232fa9e4066Sahrens } vdev_phys_t; 233fa9e4066Sahrens 234fa9e4066Sahrens typedef struct vdev_label { 235f83ffe1aSLin Ling char vl_pad1[VDEV_PAD_SIZE]; /* 8K */ 236f83ffe1aSLin Ling char vl_pad2[VDEV_PAD_SIZE]; /* 8K */ 237ecc2d604Sbonwick vdev_phys_t vl_vdev_phys; /* 112K */ 238ecc2d604Sbonwick char vl_uberblock[VDEV_UBERBLOCK_RING]; /* 128K */ 239fa9e4066Sahrens } vdev_label_t; /* 256K total */ 240fa9e4066Sahrens 241ecc2d604Sbonwick /* 242ecc2d604Sbonwick * vdev_dirty() flags 243ecc2d604Sbonwick */ 244ecc2d604Sbonwick #define VDD_METASLAB 0x01 245ecc2d604Sbonwick #define VDD_DTL 0x02 246ecc2d604Sbonwick 247fa9e4066Sahrens /* 248fa9e4066Sahrens * Size and offset of embedded boot loader region on each label. 249fa9e4066Sahrens * The total size of the first two labels plus the boot area is 4MB. 250fa9e4066Sahrens */ 251fa9e4066Sahrens #define VDEV_BOOT_OFFSET (2 * sizeof (vdev_label_t)) 252fa9e4066Sahrens #define VDEV_BOOT_SIZE (7ULL << 19) /* 3.5M */ 253fa9e4066Sahrens 254fa9e4066Sahrens /* 255fa9e4066Sahrens * Size of label regions at the start and end of each leaf device. 256fa9e4066Sahrens */ 257fa9e4066Sahrens #define VDEV_LABEL_START_SIZE (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE) 258fa9e4066Sahrens #define VDEV_LABEL_END_SIZE (2 * sizeof (vdev_label_t)) 259fa9e4066Sahrens #define VDEV_LABELS 4 260fa9e4066Sahrens 261fa9e4066Sahrens #define VDEV_ALLOC_LOAD 0 262fa9e4066Sahrens #define VDEV_ALLOC_ADD 1 26399653d4eSeschrock #define VDEV_ALLOC_SPARE 2 264fa94a07fSbrendan #define VDEV_ALLOC_L2CACHE 3 26521ecdf64SLin Ling #define VDEV_ALLOC_ROOTPOOL 4 2661195e687SMark J Musante #define VDEV_ALLOC_SPLIT 5 267*cd0837ccSGeorge Wilson #define VDEV_ALLOC_ATTACH 6 268fa9e4066Sahrens 269fa9e4066Sahrens /* 270fa9e4066Sahrens * Allocate or free a vdev 271fa9e4066Sahrens */ 27288ecc943SGeorge Wilson extern vdev_t *vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid, 27388ecc943SGeorge Wilson vdev_ops_t *ops); 27499653d4eSeschrock extern int vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *config, 27599653d4eSeschrock vdev_t *parent, uint_t id, int alloctype); 276fa9e4066Sahrens extern void vdev_free(vdev_t *vd); 277fa9e4066Sahrens 278fa9e4066Sahrens /* 279fa9e4066Sahrens * Add or remove children and parents 280fa9e4066Sahrens */ 281fa9e4066Sahrens extern void vdev_add_child(vdev_t *pvd, vdev_t *cvd); 282fa9e4066Sahrens extern void vdev_remove_child(vdev_t *pvd, vdev_t *cvd); 283fa9e4066Sahrens extern void vdev_compact_children(vdev_t *pvd); 284fa9e4066Sahrens extern vdev_t *vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops); 285fa9e4066Sahrens extern void vdev_remove_parent(vdev_t *cvd); 286fa9e4066Sahrens 287fa9e4066Sahrens /* 288fa9e4066Sahrens * vdev sync load and sync 289fa9e4066Sahrens */ 29088ecc943SGeorge Wilson extern void vdev_load_log_state(vdev_t *nvd, vdev_t *ovd); 2914b964adaSGeorge Wilson extern boolean_t vdev_log_state_valid(vdev_t *vd); 292560e6e96Seschrock extern void vdev_load(vdev_t *vd); 293fa9e4066Sahrens extern void vdev_sync(vdev_t *vd, uint64_t txg); 294fa9e4066Sahrens extern void vdev_sync_done(vdev_t *vd, uint64_t txg); 295ecc2d604Sbonwick extern void vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg); 296fa9e4066Sahrens 297fa9e4066Sahrens /* 298fa9e4066Sahrens * Available vdev types. 299fa9e4066Sahrens */ 300fa9e4066Sahrens extern vdev_ops_t vdev_root_ops; 301fa9e4066Sahrens extern vdev_ops_t vdev_mirror_ops; 302fa9e4066Sahrens extern vdev_ops_t vdev_replacing_ops; 303fa9e4066Sahrens extern vdev_ops_t vdev_raidz_ops; 304fa9e4066Sahrens extern vdev_ops_t vdev_disk_ops; 305fa9e4066Sahrens extern vdev_ops_t vdev_file_ops; 306fa9e4066Sahrens extern vdev_ops_t vdev_missing_ops; 30788ecc943SGeorge Wilson extern vdev_ops_t vdev_hole_ops; 30899653d4eSeschrock extern vdev_ops_t vdev_spare_ops; 309fa9e4066Sahrens 310fa9e4066Sahrens /* 3112a79c5feSlling * Common size functions 312fa9e4066Sahrens */ 313fa9e4066Sahrens extern uint64_t vdev_default_asize(vdev_t *vd, uint64_t psize); 314573ca77eSGeorge Wilson extern uint64_t vdev_get_min_asize(vdev_t *vd); 315573ca77eSGeorge Wilson extern void vdev_set_min_asize(vdev_t *vd); 316fa9e4066Sahrens 317e81c57b1Sahrens /* 318e81c57b1Sahrens * zdb uses this tunable, so it must be declared here to make lint happy. 319e81c57b1Sahrens */ 320e81c57b1Sahrens extern int zfs_vdev_cache_size; 321e81c57b1Sahrens 322fa9e4066Sahrens #ifdef __cplusplus 323fa9e4066Sahrens } 324fa9e4066Sahrens #endif 325fa9e4066Sahrens 326fa9e4066Sahrens #endif /* _SYS_VDEV_IMPL_H */ 327