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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) 2011, 2015 by Delphix. All rights reserved.
     24  * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
     25  * Copyright (c) 2013, Joyent, Inc. All rights reserved.
     26  * Copyright (c) 2014 Integros [integros.com]
     27  */
     28 
     29 #ifndef _ZFEATURE_COMMON_H
     30 #define	_ZFEATURE_COMMON_H
     31 
     32 #include <sys/fs/zfs.h>
     33 #include <sys/types.h>
     34 
     35 #ifdef	__cplusplus
     36 extern "C" {
     37 #endif
     38 
     39 struct zfeature_info;
     40 
     41 typedef enum spa_feature {
     42 	SPA_FEATURE_NONE = -1,
     43 	SPA_FEATURE_ASYNC_DESTROY,
     44 	SPA_FEATURE_EMPTY_BPOBJ,
     45 	SPA_FEATURE_LZ4_COMPRESS,
     46 	SPA_FEATURE_MULTI_VDEV_CRASH_DUMP,
     47 	SPA_FEATURE_SPACEMAP_HISTOGRAM,
     48 	SPA_FEATURE_ENABLED_TXG,
     49 	SPA_FEATURE_HOLE_BIRTH,
     50 	SPA_FEATURE_EXTENSIBLE_DATASET,
     51 	SPA_FEATURE_EMBEDDED_DATA,
     52 	SPA_FEATURE_BOOKMARKS,
     53 	SPA_FEATURE_FS_SS_LIMIT,
     54 	SPA_FEATURE_LARGE_BLOCKS,
     55 #ifndef __NetBSD__
     56 	SPA_FEATURE_SHA512,
     57 	SPA_FEATURE_SKEIN,
     58 #endif
     59 #ifdef illumos
     60 	SPA_FEATURE_EDONR,
     61 #endif
     62 	SPA_FEATURES
     63 } spa_feature_t;
     64 
     65 #define	SPA_FEATURE_DISABLED	(-1ULL)
     66 
     67 typedef enum zfeature_flags {
     68 	/* Can open pool readonly even if this feature is not supported. */
     69 	ZFEATURE_FLAG_READONLY_COMPAT =		(1 << 0),
     70 	/* Is this feature necessary to read the MOS? */
     71 	ZFEATURE_FLAG_MOS =			(1 << 1),
     72 	/* Activate this feature at the same time it is enabled. */
     73 	ZFEATURE_FLAG_ACTIVATE_ON_ENABLE =	(1 << 2),
     74 	/* Each dataset has a field set if it has ever used this feature. */
     75 	ZFEATURE_FLAG_PER_DATASET =		(1 << 3)
     76 } zfeature_flags_t;
     77 
     78 typedef struct zfeature_info {
     79 	spa_feature_t fi_feature;
     80 	const char *fi_uname;	/* User-facing feature name */
     81 	const char *fi_guid;	/* On-disk feature identifier */
     82 	const char *fi_desc;	/* Feature description */
     83 	zfeature_flags_t fi_flags;
     84 	/* array of dependencies, terminated by SPA_FEATURE_NONE */
     85 	const spa_feature_t *fi_depends;
     86 } zfeature_info_t;
     87 
     88 typedef int (zfeature_func_t)(zfeature_info_t *, void *);
     89 
     90 #define	ZFS_FEATURE_DEBUG
     91 
     92 extern zfeature_info_t spa_feature_table[SPA_FEATURES];
     93 
     94 extern boolean_t zfeature_is_valid_guid(const char *);
     95 
     96 extern boolean_t zfeature_is_supported(const char *);
     97 extern int zfeature_lookup_name(const char *, spa_feature_t *);
     98 extern boolean_t zfeature_depends_on(spa_feature_t, spa_feature_t);
     99 
    100 extern void zpool_feature_init(void);
    101 
    102 #ifdef	__cplusplus
    103 }
    104 #endif
    105 
    106 #endif	/* _ZFEATURE_COMMON_H */
    107