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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 /*
     23  * Copyright (c) 2013 by Delphix. All rights reserved.
     24  */
     25 
     26 #ifndef _SYS_ZFEATURE_H
     27 #define	_SYS_ZFEATURE_H
     28 
     29 #include <sys/nvpair.h>
     30 #include <sys/txg.h>
     31 #include "zfeature_common.h"
     32 
     33 #ifdef	__cplusplus
     34 extern "C" {
     35 #endif
     36 
     37 #define	VALID_FEATURE_FID(fid)	((fid) >= 0 && (fid) < SPA_FEATURES)
     38 #define	VALID_FEATURE_OR_NONE(fid)	((fid) == SPA_FEATURE_NONE ||	\
     39     VALID_FEATURE_FID(fid))
     40 
     41 struct spa;
     42 struct dmu_tx;
     43 struct objset;
     44 
     45 extern void spa_feature_create_zap_objects(struct spa *, struct dmu_tx *);
     46 extern void spa_feature_enable(struct spa *, spa_feature_t,
     47     struct dmu_tx *);
     48 extern void spa_feature_incr(struct spa *, spa_feature_t, struct dmu_tx *);
     49 extern void spa_feature_decr(struct spa *, spa_feature_t, struct dmu_tx *);
     50 extern boolean_t spa_feature_is_enabled(struct spa *, spa_feature_t);
     51 extern boolean_t spa_feature_is_active(struct spa *, spa_feature_t);
     52 extern boolean_t spa_feature_enabled_txg(spa_t *spa, spa_feature_t fid,
     53     uint64_t *txg);
     54 extern uint64_t spa_feature_refcount(spa_t *, spa_feature_t, uint64_t);
     55 extern boolean_t spa_features_check(spa_t *, boolean_t, nvlist_t *, nvlist_t *);
     56 
     57 /*
     58  * These functions are only exported for zhack and zdb; normal callers should
     59  * use the above interfaces.
     60  */
     61 extern int feature_get_refcount(struct spa *, zfeature_info_t *, uint64_t *);
     62 extern int feature_get_refcount_from_disk(spa_t *spa, zfeature_info_t *feature,
     63     uint64_t *res);
     64 extern void feature_enable_sync(struct spa *, zfeature_info_t *,
     65     struct dmu_tx *);
     66 extern void feature_sync(struct spa *, zfeature_info_t *, uint64_t,
     67     struct dmu_tx *);
     68 
     69 #ifdef	__cplusplus
     70 }
     71 #endif
     72 
     73 #endif /* _SYS_ZFEATURE_H */
     74