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Possibility to physically reserve space without writing leaf blocks
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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
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) 2013 by Delphix. All rights reserved.
24 24 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
25 25 * Copyright (c) 2013, Joyent, Inc. All rights reserved.
26 26 * Copyright (c) 2014, Nexenta Systems, Inc. All rights reserved.
27 27 */
28 28
29 29 #ifdef _KERNEL
30 30 #include <sys/systm.h>
31 31 #else
32 32 #include <errno.h>
33 33 #include <string.h>
34 34 #endif
35 35 #include <sys/debug.h>
36 36 #include <sys/fs/zfs.h>
37 37 #include <sys/inttypes.h>
38 38 #include <sys/types.h>
39 39 #include "zfeature_common.h"
40 40
41 41 /*
42 42 * Set to disable all feature checks while opening pools, allowing pools with
43 43 * unsupported features to be opened. Set for testing only.
44 44 */
45 45 boolean_t zfeature_checks_disable = B_FALSE;
46 46
47 47 zfeature_info_t spa_feature_table[SPA_FEATURES];
48 48
49 49 /*
50 50 * Valid characters for feature guids. This list is mainly for aesthetic
51 51 * purposes and could be expanded in the future. There are different allowed
52 52 * characters in the guids reverse dns portion (before the colon) and its
53 53 * short name (after the colon).
54 54 */
55 55 static int
56 56 valid_char(char c, boolean_t after_colon)
57 57 {
58 58 return ((c >= 'a' && c <= 'z') ||
59 59 (c >= '0' && c <= '9') ||
60 60 c == (after_colon ? '_' : '.'));
61 61 }
62 62
63 63 /*
64 64 * Every feature guid must contain exactly one colon which separates a reverse
65 65 * dns organization name from the feature's "short" name (e.g.
66 66 * "com.company:feature_name").
67 67 */
68 68 boolean_t
69 69 zfeature_is_valid_guid(const char *name)
70 70 {
71 71 int i;
72 72 boolean_t has_colon = B_FALSE;
73 73
74 74 i = 0;
75 75 while (name[i] != '\0') {
76 76 char c = name[i++];
77 77 if (c == ':') {
78 78 if (has_colon)
79 79 return (B_FALSE);
80 80 has_colon = B_TRUE;
81 81 continue;
82 82 }
83 83 if (!valid_char(c, has_colon))
84 84 return (B_FALSE);
85 85 }
86 86
87 87 return (has_colon);
88 88 }
89 89
90 90 boolean_t
91 91 zfeature_is_supported(const char *guid)
92 92 {
93 93 if (zfeature_checks_disable)
94 94 return (B_TRUE);
95 95
96 96 for (spa_feature_t i = 0; i < SPA_FEATURES; i++) {
97 97 zfeature_info_t *feature = &spa_feature_table[i];
98 98 if (strcmp(guid, feature->fi_guid) == 0)
99 99 return (B_TRUE);
100 100 }
101 101 return (B_FALSE);
102 102 }
103 103
104 104 int
105 105 zfeature_lookup_name(const char *name, spa_feature_t *res)
106 106 {
107 107 for (spa_feature_t i = 0; i < SPA_FEATURES; i++) {
108 108 zfeature_info_t *feature = &spa_feature_table[i];
109 109 if (strcmp(name, feature->fi_uname) == 0) {
110 110 if (res != NULL)
111 111 *res = i;
112 112 return (0);
113 113 }
114 114 }
115 115
116 116 return (ENOENT);
117 117 }
118 118
119 119 boolean_t
120 120 zfeature_depends_on(spa_feature_t fid, spa_feature_t check) {
121 121 zfeature_info_t *feature = &spa_feature_table[fid];
122 122
123 123 for (int i = 0; feature->fi_depends[i] != SPA_FEATURE_NONE; i++) {
124 124 if (feature->fi_depends[i] == check)
125 125 return (B_TRUE);
126 126 }
127 127 return (B_FALSE);
128 128 }
129 129
130 130 static void
131 131 zfeature_register(spa_feature_t fid, const char *guid, const char *name,
132 132 const char *desc, boolean_t readonly, boolean_t mos,
133 133 boolean_t activate_on_enable, const spa_feature_t *deps)
134 134 {
135 135 zfeature_info_t *feature = &spa_feature_table[fid];
136 136 static spa_feature_t nodeps[] = { SPA_FEATURE_NONE };
137 137
138 138 ASSERT(name != NULL);
139 139 ASSERT(desc != NULL);
140 140 ASSERT(!readonly || !mos);
141 141 ASSERT3U(fid, <, SPA_FEATURES);
142 142 ASSERT(zfeature_is_valid_guid(guid));
143 143
144 144 if (deps == NULL)
145 145 deps = nodeps;
146 146
147 147 feature->fi_feature = fid;
148 148 feature->fi_guid = guid;
149 149 feature->fi_uname = name;
150 150 feature->fi_desc = desc;
151 151 feature->fi_can_readonly = readonly;
152 152 feature->fi_mos = mos;
153 153 feature->fi_activate_on_enable = activate_on_enable;
154 154 feature->fi_depends = deps;
155 155 }
156 156
157 157 void
158 158 zpool_feature_init(void)
159 159 {
160 160 zfeature_register(SPA_FEATURE_ASYNC_DESTROY,
161 161 "com.delphix:async_destroy", "async_destroy",
162 162 "Destroy filesystems asynchronously.", B_TRUE, B_FALSE,
163 163 B_FALSE, NULL);
164 164
165 165 zfeature_register(SPA_FEATURE_EMPTY_BPOBJ,
166 166 "com.delphix:empty_bpobj", "empty_bpobj",
167 167 "Snapshots use less space.", B_TRUE, B_FALSE,
168 168 B_FALSE, NULL);
169 169
170 170 zfeature_register(SPA_FEATURE_LZ4_COMPRESS,
171 171 "org.illumos:lz4_compress", "lz4_compress",
172 172 "LZ4 compression algorithm support.", B_FALSE, B_FALSE,
173 173 B_TRUE, NULL);
174 174
175 175 zfeature_register(SPA_FEATURE_MULTI_VDEV_CRASH_DUMP,
176 176 "com.joyent:multi_vdev_crash_dump", "multi_vdev_crash_dump",
177 177 "Crash dumps to multiple vdev pools.", B_FALSE, B_FALSE,
178 178 B_FALSE, NULL);
179 179
180 180 zfeature_register(SPA_FEATURE_SPACEMAP_HISTOGRAM,
181 181 "com.delphix:spacemap_histogram", "spacemap_histogram",
182 182 "Spacemaps maintain space histograms.", B_TRUE, B_FALSE,
183 183 B_FALSE, NULL);
184 184
185 185 zfeature_register(SPA_FEATURE_ENABLED_TXG,
186 186 "com.delphix:enabled_txg", "enabled_txg",
187 187 "Record txg at which a feature is enabled", B_TRUE, B_FALSE,
188 188 B_FALSE, NULL);
189 189
190 190 static spa_feature_t hole_birth_deps[] = { SPA_FEATURE_ENABLED_TXG,
191 191 SPA_FEATURE_NONE };
192 192 zfeature_register(SPA_FEATURE_HOLE_BIRTH,
193 193 "com.delphix:hole_birth", "hole_birth",
194 194 "Retain hole birth txg for more precise zfs send",
195 195 B_FALSE, B_TRUE, B_TRUE, hole_birth_deps);
196 196
197 197 zfeature_register(SPA_FEATURE_EXTENSIBLE_DATASET,
198 198 "com.delphix:extensible_dataset", "extensible_dataset",
199 199 "Enhanced dataset functionality, used by other features.",
200 200 B_FALSE, B_FALSE, B_FALSE, NULL);
201 201
202 202 static const spa_feature_t bookmarks_deps[] = {
203 203 SPA_FEATURE_EXTENSIBLE_DATASET,
204 204 SPA_FEATURE_NONE
205 205 };
206 206 zfeature_register(SPA_FEATURE_BOOKMARKS,
207 207 "com.delphix:bookmarks", "bookmarks",
208 208 "\"zfs bookmark\" command",
209 209 B_TRUE, B_FALSE, B_FALSE, bookmarks_deps);
210 210
211 211 static const spa_feature_t filesystem_limits_deps[] = {
212 212 SPA_FEATURE_EXTENSIBLE_DATASET,
213 213 SPA_FEATURE_NONE
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214 214 };
215 215 zfeature_register(SPA_FEATURE_FS_SS_LIMIT,
216 216 "com.joyent:filesystem_limits", "filesystem_limits",
217 217 "Filesystem and snapshot limits.", B_TRUE, B_FALSE, B_FALSE,
218 218 filesystem_limits_deps);
219 219
220 220 zfeature_register(SPA_FEATURE_EMBEDDED_DATA,
221 221 "com.delphix:embedded_data", "embedded_data",
222 222 "Blocks which compress very well use even less space.",
223 223 B_FALSE, B_TRUE, B_TRUE, NULL);
224 +
225 + zfeature_register(SPA_FEATURE_SPACE_RESERVATION,
226 + "org.nexenta:space_reservation", "space_reservation",
227 + "Possibility to physically reserve space on disk", B_FALSE, B_FALSE,
228 + B_FALSE, NULL);
224 229 }
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