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 #define FEATURE_META_DEVICES "feature@meta_devices"
  46 
  47 extern boolean_t feature_is_supported(struct objset *os, uint64_t obj,
  48     uint64_t desc_obj, nvlist_t *unsup_feat, nvlist_t *enabled_feat);
  49 
  50 extern void spa_feature_create_zap_objects(struct spa *, struct dmu_tx *);
  51 extern void spa_feature_enable(struct spa *, spa_feature_t,
  52     struct dmu_tx *);
  53 extern void spa_feature_incr(struct spa *, spa_feature_t, struct dmu_tx *);
  54 extern void spa_feature_decr(struct spa *, spa_feature_t, struct dmu_tx *);
  55 extern boolean_t spa_feature_is_enabled(struct spa *, spa_feature_t);
  56 extern boolean_t spa_feature_is_active(struct spa *, spa_feature_t);
  57 extern boolean_t spa_feature_enabled_txg(spa_t *spa, spa_feature_t fid,
  58     uint64_t *txg);
  59 extern uint64_t spa_feature_refcount(spa_t *, spa_feature_t, uint64_t);
  60 extern boolean_t spa_features_check(spa_t *, boolean_t, nvlist_t *, nvlist_t *);
  61 
  62 /*
  63  * These functions are only exported for zhack and zdb; normal callers should
  64  * use the above interfaces.
  65  */
  66 extern int feature_get_refcount(struct spa *, zfeature_info_t *, uint64_t *);
  67 extern int feature_get_refcount_from_disk(spa_t *spa, zfeature_info_t *feature,
  68     uint64_t *res);
  69 extern void feature_enable_sync(struct spa *, zfeature_info_t *,
  70     struct dmu_tx *);
  71 extern void feature_sync(struct spa *, zfeature_info_t *, uint64_t,
  72     struct dmu_tx *);
  73 
  74 #ifdef  __cplusplus
  75 }
  76 #endif
  77 
  78 #endif /* _SYS_ZFEATURE_H */