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.
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.
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]
23 * Copyright (c) 2012 by Delphix. All rights reserved.
24 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
28 #include <sys/systm.h>
33 #include <sys/debug.h>
34 #include <sys/fs/zfs.h>
35 #include <sys/inttypes.h>
36 #include <sys/types.h>
37 #include "zfeature_common.h"
40 * Set to disable all feature checks while opening pools, allowing pools with
41 * unsupported features to be opened. Set for testing only.
43 boolean_t zfeature_checks_disable
= B_FALSE
;
45 zfeature_info_t spa_feature_table
[SPA_FEATURES
];
48 * Valid characters for feature guids. This list is mainly for aesthetic
49 * purposes and could be expanded in the future. There are different allowed
50 * characters in the guids reverse dns portion (before the colon) and its
51 * short name (after the colon).
54 valid_char(char c
, boolean_t after_colon
)
56 return ((c
>= 'a' && c
<= 'z') ||
57 (c
>= '0' && c
<= '9') ||
58 c
== (after_colon
? '_' : '.'));
62 * Every feature guid must contain exactly one colon which separates a reverse
63 * dns organization name from the feature's "short" name (e.g.
64 * "com.company:feature_name").
67 zfeature_is_valid_guid(const char *name
)
70 boolean_t has_colon
= B_FALSE
;
73 while (name
[i
] != '\0') {
81 if (!valid_char(c
, has_colon
))
89 zfeature_is_supported(const char *guid
)
91 if (zfeature_checks_disable
)
94 return (0 == zfeature_lookup_guid(guid
, NULL
));
98 zfeature_lookup_guid(const char *guid
, zfeature_info_t
**res
)
102 for (i
= 0; i
< SPA_FEATURES
; i
++) {
103 zfeature_info_t
*feature
= &spa_feature_table
[i
];
104 if (strcmp(guid
, feature
->fi_guid
) == 0) {
115 zfeature_lookup_name(const char *name
, zfeature_info_t
**res
)
119 for (i
= 0; i
< SPA_FEATURES
; i
++) {
120 zfeature_info_t
*feature
= &spa_feature_table
[i
];
121 if (strcmp(name
, feature
->fi_uname
) == 0) {
132 zfeature_register(int fid
, const char *guid
, const char *name
, const char *desc
,
133 boolean_t readonly
, boolean_t mos
, zfeature_info_t
**deps
)
135 zfeature_info_t
*feature
= &spa_feature_table
[fid
];
136 static zfeature_info_t
*nodeps
[] = { NULL
};
138 ASSERT(name
!= NULL
);
139 ASSERT(desc
!= NULL
);
140 ASSERT(!readonly
|| !mos
);
141 ASSERT3U(fid
, <, SPA_FEATURES
);
142 ASSERT(zfeature_is_valid_guid(guid
));
147 feature
->fi_guid
= guid
;
148 feature
->fi_uname
= name
;
149 feature
->fi_desc
= desc
;
150 feature
->fi_can_readonly
= readonly
;
151 feature
->fi_mos
= mos
;
152 feature
->fi_depends
= deps
;
156 zpool_feature_init(void)
158 zfeature_register(SPA_FEATURE_ASYNC_DESTROY
,
159 "com.delphix:async_destroy", "async_destroy",
160 "Destroy filesystems asynchronously.", B_TRUE
, B_FALSE
, NULL
);
161 zfeature_register(SPA_FEATURE_EMPTY_BPOBJ
,
162 "com.delphix:empty_bpobj", "empty_bpobj",
163 "Snapshots use less space.", B_TRUE
, B_FALSE
, NULL
);
164 zfeature_register(SPA_FEATURE_LZ4_COMPRESS
,
165 "org.illumos:lz4_compress", "lz4_compress",
166 "LZ4 compression algorithm support.", B_FALSE
, B_FALSE
, NULL
);