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--- old/usr/src/common/zfs/zfeature_common.c
+++ new/usr/src/common/zfs/zfeature_common.c
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
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14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21
22 22 /*
23 23 * Copyright (c) 2012 by Delphix. All rights reserved.
24 + * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
24 25 */
25 26
26 27 #ifdef _KERNEL
27 28 #include <sys/systm.h>
28 29 #else
29 30 #include <errno.h>
30 31 #include <string.h>
31 32 #endif
32 33 #include <sys/debug.h>
33 34 #include <sys/fs/zfs.h>
34 35 #include <sys/inttypes.h>
35 36 #include <sys/types.h>
36 37 #include "zfeature_common.h"
37 38
38 39 /*
39 40 * Set to disable all feature checks while opening pools, allowing pools with
40 41 * unsupported features to be opened. Set for testing only.
41 42 */
42 43 boolean_t zfeature_checks_disable = B_FALSE;
43 44
44 45 zfeature_info_t spa_feature_table[SPA_FEATURES];
45 46
46 47 /*
47 48 * Valid characters for feature guids. This list is mainly for aesthetic
48 49 * purposes and could be expanded in the future. There are different allowed
49 50 * characters in the guids reverse dns portion (before the colon) and its
50 51 * short name (after the colon).
51 52 */
52 53 static int
53 54 valid_char(char c, boolean_t after_colon)
54 55 {
55 56 return ((c >= 'a' && c <= 'z') ||
56 57 (c >= '0' && c <= '9') ||
57 58 c == (after_colon ? '_' : '.'));
58 59 }
59 60
60 61 /*
61 62 * Every feature guid must contain exactly one colon which separates a reverse
62 63 * dns organization name from the feature's "short" name (e.g.
63 64 * "com.company:feature_name").
64 65 */
65 66 boolean_t
66 67 zfeature_is_valid_guid(const char *name)
67 68 {
68 69 int i;
69 70 boolean_t has_colon = B_FALSE;
70 71
71 72 i = 0;
72 73 while (name[i] != '\0') {
73 74 char c = name[i++];
74 75 if (c == ':') {
75 76 if (has_colon)
76 77 return (B_FALSE);
77 78 has_colon = B_TRUE;
78 79 continue;
79 80 }
80 81 if (!valid_char(c, has_colon))
81 82 return (B_FALSE);
82 83 }
83 84
84 85 return (has_colon);
85 86 }
86 87
87 88 boolean_t
88 89 zfeature_is_supported(const char *guid)
89 90 {
90 91 if (zfeature_checks_disable)
91 92 return (B_TRUE);
92 93
93 94 return (0 == zfeature_lookup_guid(guid, NULL));
94 95 }
95 96
96 97 int
97 98 zfeature_lookup_guid(const char *guid, zfeature_info_t **res)
98 99 {
99 100 for (int i = 0; i < SPA_FEATURES; i++) {
100 101 zfeature_info_t *feature = &spa_feature_table[i];
101 102 if (strcmp(guid, feature->fi_guid) == 0) {
102 103 if (res != NULL)
103 104 *res = feature;
104 105 return (0);
105 106 }
106 107 }
107 108
108 109 return (ENOENT);
109 110 }
110 111
111 112 int
112 113 zfeature_lookup_name(const char *name, zfeature_info_t **res)
113 114 {
114 115 for (int i = 0; i < SPA_FEATURES; i++) {
115 116 zfeature_info_t *feature = &spa_feature_table[i];
116 117 if (strcmp(name, feature->fi_uname) == 0) {
117 118 if (res != NULL)
118 119 *res = feature;
119 120 return (0);
120 121 }
121 122 }
122 123
123 124 return (ENOENT);
124 125 }
125 126
126 127 static void
127 128 zfeature_register(int fid, const char *guid, const char *name, const char *desc,
128 129 boolean_t readonly, boolean_t mos, zfeature_info_t **deps)
129 130 {
130 131 zfeature_info_t *feature = &spa_feature_table[fid];
131 132 static zfeature_info_t *nodeps[] = { NULL };
132 133
133 134 ASSERT(name != NULL);
134 135 ASSERT(desc != NULL);
135 136 ASSERT(!readonly || !mos);
136 137 ASSERT3U(fid, <, SPA_FEATURES);
137 138 ASSERT(zfeature_is_valid_guid(guid));
138 139
139 140 if (deps == NULL)
140 141 deps = nodeps;
141 142
142 143 feature->fi_guid = guid;
143 144 feature->fi_uname = name;
144 145 feature->fi_desc = desc;
145 146 feature->fi_can_readonly = readonly;
146 147 feature->fi_mos = mos;
147 148 feature->fi_depends = deps;
148 149 }
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149 150
150 151 void
151 152 zpool_feature_init(void)
152 153 {
153 154 zfeature_register(SPA_FEATURE_ASYNC_DESTROY,
154 155 "com.delphix:async_destroy", "async_destroy",
155 156 "Destroy filesystems asynchronously.", B_TRUE, B_FALSE, NULL);
156 157 zfeature_register(SPA_FEATURE_EMPTY_BPOBJ,
157 158 "com.delphix:empty_bpobj", "empty_bpobj",
158 159 "Snapshots use less space.", B_TRUE, B_FALSE, NULL);
160 + zfeature_register(SPA_FEATURE_LZ4_COMPRESS,
161 + "org.illumos:lz4_compress", "lz4_compress",
162 + "LZ4 compression algorithm support.", B_FALSE, B_FALSE, NULL);
159 163 }
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