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      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 2010 Sun Microsystems, Inc.  All rights reserved.
     23  * Use is subject to license terms.
     24  */
     25 
     26 #ifndef _SYS_VDEV_H
     27 #define	_SYS_VDEV_H
     28 
     29 #include <sys/spa.h>
     30 #include <sys/zio.h>
     31 #include <sys/dmu.h>
     32 #include <sys/space_map.h>
     33 #include <sys/fs/zfs.h>
     34 
     35 #ifdef	__cplusplus
     36 extern "C" {
     37 #endif
     38 
     39 typedef enum vdev_dtl_type {
     40 	DTL_MISSING,	/* 0% replication: no copies of the data */
     41 	DTL_PARTIAL,	/* less than 100% replication: some copies missing */
     42 	DTL_SCRUB,	/* unable to fully repair during scrub/resilver */
     43 	DTL_OUTAGE,	/* temporarily missing (used to attempt detach) */
     44 	DTL_TYPES
     45 } vdev_dtl_type_t;
     46 
     47 extern boolean_t zfs_nocacheflush;
     48 
     49 extern int vdev_open(vdev_t *);
     50 extern void vdev_open_children(vdev_t *);
     51 extern boolean_t vdev_uses_zvols(vdev_t *);
     52 extern int vdev_validate(vdev_t *);
     53 extern void vdev_close(vdev_t *);
     54 extern int vdev_create(vdev_t *, uint64_t txg, boolean_t isreplace);
     55 extern void vdev_reopen(vdev_t *);
     56 extern int vdev_validate_aux(vdev_t *vd);
     57 extern zio_t *vdev_probe(vdev_t *vd, zio_t *pio);
     58 
     59 extern boolean_t vdev_is_bootable(vdev_t *vd);
     60 extern vdev_t *vdev_lookup_top(spa_t *spa, uint64_t vdev);
     61 extern vdev_t *vdev_lookup_by_guid(vdev_t *vd, uint64_t guid);
     62 extern void vdev_dtl_dirty(vdev_t *vd, vdev_dtl_type_t d,
     63     uint64_t txg, uint64_t size);
     64 extern boolean_t vdev_dtl_contains(vdev_t *vd, vdev_dtl_type_t d,
     65     uint64_t txg, uint64_t size);
     66 extern boolean_t vdev_dtl_empty(vdev_t *vd, vdev_dtl_type_t d);
     67 extern void vdev_dtl_reassess(vdev_t *vd, uint64_t txg, uint64_t scrub_txg,
     68     int scrub_done);
     69 extern boolean_t vdev_dtl_required(vdev_t *vd);
     70 extern boolean_t vdev_resilver_needed(vdev_t *vd,
     71     uint64_t *minp, uint64_t *maxp);
     72 
     73 extern int vdev_metaslab_init(vdev_t *vd, uint64_t txg);
     74 extern void vdev_metaslab_fini(vdev_t *vd);
     75 extern void vdev_metaslab_set_size(vdev_t *);
     76 extern void vdev_expand(vdev_t *vd, uint64_t txg);
     77 extern void vdev_split(vdev_t *vd);
     78 
     79 
     80 extern void vdev_get_stats(vdev_t *vd, vdev_stat_t *vs);
     81 extern void vdev_clear_stats(vdev_t *vd);
     82 extern void vdev_stat_update(zio_t *zio, uint64_t psize);
     83 extern void vdev_scrub_stat_update(vdev_t *vd, pool_scrub_type_t type,
     84     boolean_t complete);
     85 extern void vdev_propagate_state(vdev_t *vd);
     86 extern void vdev_set_state(vdev_t *vd, boolean_t isopen, vdev_state_t state,
     87     vdev_aux_t aux);
     88 
     89 extern void vdev_space_update(vdev_t *vd,
     90     int64_t alloc_delta, int64_t defer_delta, int64_t space_delta);
     91 
     92 extern uint64_t vdev_psize_to_asize(vdev_t *vd, uint64_t psize);
     93 
     94 extern int vdev_fault(spa_t *spa, uint64_t guid, vdev_aux_t aux);
     95 extern int vdev_degrade(spa_t *spa, uint64_t guid, vdev_aux_t aux);
     96 extern int vdev_online(spa_t *spa, uint64_t guid, uint64_t flags,
     97     vdev_state_t *);
     98 extern int vdev_offline(spa_t *spa, uint64_t guid, uint64_t flags);
     99 extern void vdev_clear(spa_t *spa, vdev_t *vd);
    100 
    101 extern boolean_t vdev_is_dead(vdev_t *vd);
    102 extern boolean_t vdev_readable(vdev_t *vd);
    103 extern boolean_t vdev_writeable(vdev_t *vd);
    104 extern boolean_t vdev_allocatable(vdev_t *vd);
    105 extern boolean_t vdev_accessible(vdev_t *vd, zio_t *zio);
    106 
    107 extern void vdev_cache_init(vdev_t *vd);
    108 extern void vdev_cache_fini(vdev_t *vd);
    109 extern int vdev_cache_read(zio_t *zio);
    110 extern void vdev_cache_write(zio_t *zio);
    111 extern void vdev_cache_purge(vdev_t *vd);
    112 
    113 extern void vdev_queue_init(vdev_t *vd);
    114 extern void vdev_queue_fini(vdev_t *vd);
    115 extern zio_t *vdev_queue_io(zio_t *zio);
    116 extern void vdev_queue_io_done(zio_t *zio);
    117 
    118 extern void vdev_config_dirty(vdev_t *vd);
    119 extern void vdev_config_clean(vdev_t *vd);
    120 extern int vdev_config_sync(vdev_t **svd, int svdcount, uint64_t txg,
    121     boolean_t);
    122 
    123 extern void vdev_state_dirty(vdev_t *vd);
    124 extern void vdev_state_clean(vdev_t *vd);
    125 
    126 extern void vdev_top_config_generate(spa_t *spa, nvlist_t *config);
    127 extern nvlist_t *vdev_config_generate(spa_t *spa, vdev_t *vd,
    128     boolean_t getstats, boolean_t isspare, boolean_t isl2cache);
    129 
    130 /*
    131  * Label routines
    132  */
    133 struct uberblock;
    134 extern uint64_t vdev_label_offset(uint64_t psize, int l, uint64_t offset);
    135 extern int vdev_label_number(uint64_t psise, uint64_t offset);
    136 extern nvlist_t *vdev_label_read_config(vdev_t *vd);
    137 extern void vdev_uberblock_load(zio_t *zio, vdev_t *vd, struct uberblock *ub);
    138 
    139 typedef enum {
    140 	VDEV_LABEL_CREATE,	/* create/add a new device */
    141 	VDEV_LABEL_REPLACE,	/* replace an existing device */
    142 	VDEV_LABEL_SPARE,	/* add a new hot spare */
    143 	VDEV_LABEL_REMOVE,	/* remove an existing device */
    144 	VDEV_LABEL_L2CACHE,	/* add an L2ARC cache device */
    145 	VDEV_LABEL_SPLIT	/* generating new label for split-off dev */
    146 } vdev_labeltype_t;
    147 
    148 extern int vdev_label_init(vdev_t *vd, uint64_t txg, vdev_labeltype_t reason);
    149 
    150 #ifdef	__cplusplus
    151 }
    152 #endif
    153 
    154 #endif	/* _SYS_VDEV_H */
    155