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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 2007 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 #pragma ident	"@(#)vdev.h	1.16	07/12/12 SMI"
     30 
     31 #include <sys/spa.h>
     32 #include <sys/zio.h>
     33 #include <sys/dmu.h>
     34 #include <sys/space_map.h>
     35 #include <sys/fs/zfs.h>
     36 
     37 #ifdef	__cplusplus
     38 extern "C" {
     39 #endif
     40 
     41 extern boolean_t zfs_nocacheflush;
     42 
     43 /*
     44  * Fault injection modes.
     45  */
     46 #define	VDEV_FAULT_NONE		0
     47 #define	VDEV_FAULT_RANDOM	1
     48 #define	VDEV_FAULT_COUNT	2
     49 
     50 extern int vdev_open(vdev_t *);
     51 extern int vdev_validate(vdev_t *);
     52 extern void vdev_close(vdev_t *);
     53 extern int vdev_create(vdev_t *, uint64_t txg, boolean_t isreplace);
     54 extern void vdev_init(vdev_t *, uint64_t txg);
     55 extern void vdev_reopen(vdev_t *);
     56 extern int vdev_validate_aux(vdev_t *vd);
     57 extern int vdev_probe(vdev_t *);
     58 
     59 extern vdev_t *vdev_lookup_top(spa_t *spa, uint64_t vdev);
     60 extern vdev_t *vdev_lookup_by_guid(vdev_t *vd, uint64_t guid);
     61 extern void vdev_dtl_dirty(space_map_t *sm, uint64_t txg, uint64_t size);
     62 extern int vdev_dtl_contains(space_map_t *sm, uint64_t txg, uint64_t size);
     63 extern void vdev_dtl_reassess(vdev_t *vd, uint64_t txg, uint64_t scrub_txg,
     64     int scrub_done);
     65 
     66 extern const char *vdev_description(vdev_t *vd);
     67 
     68 extern int vdev_metaslab_init(vdev_t *vd, uint64_t txg);
     69 extern void vdev_metaslab_fini(vdev_t *vd);
     70 
     71 extern void vdev_get_stats(vdev_t *vd, vdev_stat_t *vs);
     72 extern void vdev_clear_stats(vdev_t *vd);
     73 extern void vdev_stat_update(zio_t *zio);
     74 extern void vdev_scrub_stat_update(vdev_t *vd, pool_scrub_type_t type,
     75     boolean_t complete);
     76 extern int vdev_getspec(spa_t *spa, uint64_t vdev, char **vdev_spec);
     77 extern void vdev_propagate_state(vdev_t *vd);
     78 extern void vdev_set_state(vdev_t *vd, boolean_t isopen, vdev_state_t state,
     79     vdev_aux_t aux);
     80 
     81 extern void vdev_space_update(vdev_t *vd, int64_t space_delta,
     82     int64_t alloc_delta, boolean_t update_root);
     83 
     84 extern uint64_t vdev_psize_to_asize(vdev_t *vd, uint64_t psize);
     85 
     86 extern int vdev_fault(spa_t *spa, uint64_t guid);
     87 extern int vdev_degrade(spa_t *spa, uint64_t guid);
     88 extern int vdev_online(spa_t *spa, uint64_t guid, uint64_t flags,
     89     vdev_state_t *);
     90 extern int vdev_offline(spa_t *spa, uint64_t guid, uint64_t flags);
     91 extern void vdev_clear(spa_t *spa, vdev_t *vd, boolean_t reopen_wanted);
     92 
     93 extern int vdev_error_inject(vdev_t *vd, zio_t *zio);
     94 extern int vdev_is_dead(vdev_t *vd);
     95 extern int vdev_readable(vdev_t *vd);
     96 extern int vdev_writeable(vdev_t *vd);
     97 
     98 extern void vdev_cache_init(vdev_t *vd);
     99 extern void vdev_cache_fini(vdev_t *vd);
    100 extern int vdev_cache_read(zio_t *zio);
    101 extern void vdev_cache_write(zio_t *zio);
    102 extern void vdev_cache_purge(vdev_t *vd);
    103 
    104 extern void vdev_queue_init(vdev_t *vd);
    105 extern void vdev_queue_fini(vdev_t *vd);
    106 extern zio_t *vdev_queue_io(zio_t *zio);
    107 extern void vdev_queue_io_done(zio_t *zio);
    108 
    109 extern void vdev_config_dirty(vdev_t *vd);
    110 extern void vdev_config_clean(vdev_t *vd);
    111 extern int vdev_config_sync(vdev_t **svd, int svdcount, uint64_t txg);
    112 
    113 extern nvlist_t *vdev_config_generate(spa_t *spa, vdev_t *vd,
    114     boolean_t getstats, boolean_t isspare, boolean_t isl2cache);
    115 
    116 /*
    117  * Label routines
    118  */
    119 struct uberblock;
    120 extern uint64_t vdev_label_offset(uint64_t psize, int l, uint64_t offset);
    121 extern nvlist_t *vdev_label_read_config(vdev_t *vd);
    122 extern void vdev_uberblock_load(zio_t *zio, vdev_t *vd, struct uberblock *ub);
    123 
    124 typedef enum {
    125 	VDEV_LABEL_CREATE,	/* create/add a new device */
    126 	VDEV_LABEL_REPLACE,	/* replace an existing device */
    127 	VDEV_LABEL_SPARE,	/* add a new hot spare */
    128 	VDEV_LABEL_REMOVE,	/* remove an existing device */
    129 	VDEV_LABEL_L2CACHE	/* add an L2ARC cache device */
    130 } vdev_labeltype_t;
    131 
    132 extern int vdev_label_init(vdev_t *vd, uint64_t txg, vdev_labeltype_t reason);
    133 
    134 #ifdef	__cplusplus
    135 }
    136 #endif
    137 
    138 #endif	/* _SYS_VDEV_H */
    139