Mercurial > illumos > illumos-gate

annotate usr/src/uts/common/fs/zfs/zfeature.c @ 13765:9410cf539b11

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backout 3006: causes 3046 (panics after mounting root)
author Richard Lowe <richlowe@richlowe.net>
date Wed, 01 Aug 2012 16:40:39 -0400
parents 38b4aca480b3
children 8f78aae28a63
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * CDDL HEADER START
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3 *
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4 * The contents of this file are subject to the terms of the
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5 * Common Development and Distribution License (the "License").
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6 * You may not use this file except in compliance with the License.
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7 *
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8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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9 * or http://www.opensolaris.org/os/licensing.
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10 * See the License for the specific language governing permissions
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11 * and limitations under the License.
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12 *
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13 * When distributing Covered Code, include this CDDL HEADER in each
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14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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15 * If applicable, add the following below this CDDL HEADER, with the
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16 * fields enclosed by brackets "[]" replaced with your own identifying
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17 * information: Portions Copyright [yyyy] [name of copyright owner]
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18 *
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19 * CDDL HEADER END
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20 */
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21
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22 /*
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23 * Copyright (c) 2012 by Delphix. All rights reserved.
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24 */
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25
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26 #include <sys/zfs_context.h>
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27 #include <sys/zfeature.h>
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28 #include <sys/dmu.h>
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29 #include <sys/nvpair.h>
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30 #include <sys/zap.h>
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31 #include <sys/dmu_tx.h>
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32 #include "zfeature_common.h"
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33 #include <sys/spa_impl.h>
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34
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35 /*
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36 * ZFS Feature Flags
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37 * -----------------
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38 *
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39 * ZFS feature flags are used to provide fine-grained versioning to the ZFS
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40 * on-disk format. Once enabled on a pool feature flags replace the old
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41 * spa_version() number.
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42 *
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43 * Each new on-disk format change will be given a uniquely identifying string
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44 * guid rather than a version number. This avoids the problem of different
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45 * organizations creating new on-disk formats with the same version number. To
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46 * keep feature guids unique they should consist of the reverse dns name of the
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47 * organization which implemented the feature and a short name for the feature,
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48 * separated by a colon (e.g. com.delphix:async_destroy).
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49 *
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50 * Reference Counts
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51 * ----------------
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52 *
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53 * Within each pool features can be in one of three states: disabled, enabled,
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54 * or active. These states are differentiated by a reference count stored on
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55 * disk for each feature:
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56 *
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57 * 1) If there is no reference count stored on disk the feature is disabled.
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58 * 2) If the reference count is 0 a system administrator has enabled the
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59 * feature, but the feature has not been used yet, so no on-disk
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60 * format changes have been made.
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61 * 3) If the reference count is greater than 0 the feature is active.
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62 * The format changes required by the feature are currently on disk.
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63 * Note that if the feature's format changes are reversed the feature
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64 * may choose to set its reference count back to 0.
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65 *
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66 * Feature flags makes no differentiation between non-zero reference counts
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67 * for an active feature (e.g. a reference count of 1 means the same thing as a
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68 * reference count of 27834721), but feature implementations may choose to use
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69 * the reference count to store meaningful information. For example, a new RAID
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70 * implementation might set the reference count to the number of vdevs using
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71 * it. If all those disks are removed from the pool the feature goes back to
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72 * having a reference count of 0.
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73 *
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74 * It is the responsibility of the individual features to maintain a non-zero
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75 * reference count as long as the feature's format changes are present on disk.
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76 *
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77 * Dependencies
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78 * ------------
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79 *
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80 * Each feature may depend on other features. The only effect of this
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81 * relationship is that when a feature is enabled all of its dependencies are
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82 * automatically enabled as well. Any future work to support disabling of
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83 * features would need to ensure that features cannot be disabled if other
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84 * enabled features depend on them.
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85 *
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86 * On-disk Format
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87 * --------------
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88 *
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89 * When feature flags are enabled spa_version() is set to SPA_VERSION_FEATURES
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90 * (5000). In order for this to work the pool is automatically upgraded to
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91 * SPA_VERSION_BEFORE_FEATURES (28) first, so all pre-feature flags on disk
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92 * format changes will be in use.
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93 *
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94 * Information about features is stored in 3 ZAP objects in the pool's MOS.
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95 * These objects are linked to by the following names in the pool directory
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96 * object:
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97 *
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98 * 1) features_for_read: feature guid -> reference count
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99 * Features needed to open the pool for reading.
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100 * 2) features_for_write: feature guid -> reference count
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101 * Features needed to open the pool for writing.
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102 * 3) feature_descriptions: feature guid -> descriptive string
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103 * A human readable string.
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104 *
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105 * All enabled features appear in either features_for_read or
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106 * features_for_write, but not both.
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107 *
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108 * To open a pool in read-only mode only the features listed in
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109 * features_for_read need to be supported.
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110 *
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111 * To open the pool in read-write mode features in both features_for_read and
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112 * features_for_write need to be supported.
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113 *
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114 * Some features may be required to read the ZAP objects containing feature
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115 * information. To allow software to check for compatibility with these features
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116 * before the pool is opened their names must be stored in the label in a
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117 * new "features_for_read" entry (note that features that are only required
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118 * to write to a pool never need to be stored in the label since the
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119 * features_for_write ZAP object can be read before the pool is written to).
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120 * To save space in the label features must be explicitly marked as needing to
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121 * be written to the label. Also, reference counts are not stored in the label,
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122 * instead any feature whose reference count drops to 0 is removed from the
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123 * label.
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124 *
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125 * Adding New Features
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126 * -------------------
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127 *
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128 * Features must be registered in zpool_feature_init() function in
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129 * zfeature_common.c using the zfeature_register() function. This function
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130 * has arguments to specify if the feature should be stored in the
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131 * features_for_read or features_for_write ZAP object and if it needs to be
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132 * written to the label when active.
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133 *
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134 * Once a feature is registered it will appear as a "feature@<feature name>"
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135 * property which can be set by an administrator. Feature implementors should
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136 * use the spa_feature_is_enabled() and spa_feature_is_active() functions to
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137 * query the state of a feature and the spa_feature_incr() and
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138 * spa_feature_decr() functions to change an enabled feature's reference count.
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139 * Reference counts may only be updated in the syncing context.
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140 *
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141 * Features may not perform enable-time initialization. Instead, any such
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142 * initialization should occur when the feature is first used. This design
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143 * enforces that on-disk changes be made only when features are used. Code
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144 * should only check if a feature is enabled using spa_feature_is_enabled(),
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145 * not by relying on any feature specific metadata existing. If a feature is
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146 * enabled, but the feature's metadata is not on disk yet then it should be
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147 * created as needed.
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148 *
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149 * As an example, consider the com.delphix:async_destroy feature. This feature
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150 * relies on the existence of a bptree in the MOS that store blocks for
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151 * asynchronous freeing. This bptree is not created when async_destroy is
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152 * enabled. Instead, when a dataset is destroyed spa_feature_is_enabled() is
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153 * called to check if async_destroy is enabled. If it is and the bptree object
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154 * does not exist yet, the bptree object is created as part of the dataset
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155 * destroy and async_destroy's reference count is incremented to indicate it
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156 * has made an on-disk format change. Later, after the destroyed dataset's
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157 * blocks have all been asynchronously freed there is no longer any use for the
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158 * bptree object, so it is destroyed and async_destroy's reference count is
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159 * decremented back to 0 to indicate that it has undone its on-disk format
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160 * changes.
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161 */
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162
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163 typedef enum {
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164 FEATURE_ACTION_ENABLE,
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165 FEATURE_ACTION_INCR,
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diff changeset
166 FEATURE_ACTION_DECR,
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
167 } feature_action_t;
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
168
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
169 /*
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
170 * Checks that the features active in the specified object are supported by
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
171 * this software. Adds each unsupported feature (name -> description) to
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
172 * the supplied nvlist.
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
173 */
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
174 boolean_t
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
175 feature_is_supported(objset_t *os, uint64_t obj, uint64_t desc_obj,
13753
2aba784c276b 2762 zpool command should have better support for feature flags
Christopher Siden <chris.siden@delphix.com>
parents: 13701
diff changeset
176 nvlist_t *unsup_feat, nvlist_t *enabled_feat)
13701
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
177 {
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
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parents:
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178 boolean_t supported;
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
179 zap_cursor_t zc;
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
180 zap_attribute_t za;
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
181
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
182 supported = B_TRUE;
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
183 for (zap_cursor_init(&zc, os, obj);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
184 zap_cursor_retrieve(&zc, &za) == 0;
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
185 zap_cursor_advance(&zc)) {
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
186 ASSERT(za.za_integer_length == sizeof (uint64_t) &&
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
187 za.za_num_integers == 1);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
188
13753
2aba784c276b 2762 zpool command should have better support for feature flags
Christopher Siden <chris.siden@delphix.com>
parents: 13701
diff changeset
189 if (NULL != enabled_feat) {
2aba784c276b 2762 zpool command should have better support for feature flags
Christopher Siden <chris.siden@delphix.com>
parents: 13701
diff changeset
190 fnvlist_add_uint64(enabled_feat, za.za_name,
2aba784c276b 2762 zpool command should have better support for feature flags
Christopher Siden <chris.siden@delphix.com>
parents: 13701
diff changeset
191 za.za_first_integer);
2aba784c276b 2762 zpool command should have better support for feature flags
Christopher Siden <chris.siden@delphix.com>
parents: 13701
diff changeset
192 }
2aba784c276b 2762 zpool command should have better support for feature flags
Christopher Siden <chris.siden@delphix.com>
parents: 13701
diff changeset
193
13701
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
194 if (za.za_first_integer != 0 &&
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
195 !zfeature_is_supported(za.za_name)) {
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
196 supported = B_FALSE;
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
197
13753
2aba784c276b 2762 zpool command should have better support for feature flags
Christopher Siden <chris.siden@delphix.com>
parents: 13701
diff changeset
198 if (NULL != unsup_feat) {
13701
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
199 char *desc = "";
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
200 char buf[MAXPATHLEN];
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
201
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
202 if (zap_lookup(os, desc_obj, za.za_name,
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
203 1, sizeof (buf), buf) == 0)
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
204 desc = buf;
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
205
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
206 VERIFY(nvlist_add_string(unsup_feat, za.za_name,
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
207 desc) == 0);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
208 }
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
209 }
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
210 }
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
211 zap_cursor_fini(&zc);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
212
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
213 return (supported);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
214 }
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
215
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
216 static int
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
217 feature_get_refcount(objset_t *os, uint64_t read_obj, uint64_t write_obj,
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
218 zfeature_info_t *feature, uint64_t *res)
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
219 {
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
220 int err;
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
221 uint64_t refcount;
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
222 uint64_t zapobj = feature->fi_can_readonly ? write_obj : read_obj;
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
223
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
224 ASSERT(0 != zapobj);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
225
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
226 err = zap_lookup(os, zapobj, feature->fi_guid, sizeof (uint64_t), 1,
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
227 &refcount);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
228 if (err != 0) {
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
229 if (err == ENOENT)
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
230 return (ENOTSUP);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
231 else
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
232 return (err);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
233 }
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
234 *res = refcount;
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
235 return (0);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
236 }
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
237
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
238 static int
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
239 feature_do_action(objset_t *os, uint64_t read_obj, uint64_t write_obj,
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
240 uint64_t desc_obj, zfeature_info_t *feature, feature_action_t action,
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
241 dmu_tx_t *tx)
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
242 {
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
243 int error;
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
244 uint64_t refcount;
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
245 uint64_t zapobj = feature->fi_can_readonly ? write_obj : read_obj;
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
246
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
247 ASSERT(0 != zapobj);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
248 ASSERT(zfeature_is_valid_guid(feature->fi_guid));
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
249
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
250 error = zap_lookup(os, zapobj, feature->fi_guid,
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
251 sizeof (uint64_t), 1, &refcount);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
252
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
253 /*
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
254 * If we can't ascertain the status of the specified feature, an I/O
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
255 * error occurred.
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
256 */
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
257 if (error != 0 && error != ENOENT)
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
258 return (error);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
259
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
260 switch (action) {
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
261 case FEATURE_ACTION_ENABLE:
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
262 /*
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
263 * If the feature is already enabled, ignore the request.
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
264 */
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
265 if (error == 0)
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
266 return (0);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
267 refcount = 0;
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
268 break;
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
269 case FEATURE_ACTION_INCR:
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
270 if (error == ENOENT)
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
271 return (ENOTSUP);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
272 if (refcount == UINT64_MAX)
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
273 return (EOVERFLOW);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
274 refcount++;
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
275 break;
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
276 case FEATURE_ACTION_DECR:
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
277 if (error == ENOENT)
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
278 return (ENOTSUP);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
279 if (refcount == 0)
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
280 return (EOVERFLOW);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
281 refcount--;
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
282 break;
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
283 default:
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
284 ASSERT(0);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
285 break;
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
286 }
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
287
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
288 if (action == FEATURE_ACTION_ENABLE) {
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
289 int i;
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
290
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
291 for (i = 0; feature->fi_depends[i] != NULL; i++) {
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
292 zfeature_info_t *dep = feature->fi_depends[i];
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
293
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
294 error = feature_do_action(os, read_obj, write_obj,
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
295 desc_obj, dep, FEATURE_ACTION_ENABLE, tx);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
296 if (error != 0)
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
297 return (error);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
298 }
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
299 }
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
300
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
301 error = zap_update(os, zapobj, feature->fi_guid,
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
302 sizeof (uint64_t), 1, &refcount, tx);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
303 if (error != 0)
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
304 return (error);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
305
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
306 if (action == FEATURE_ACTION_ENABLE) {
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
307 error = zap_update(os, desc_obj,
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
308 feature->fi_guid, 1, strlen(feature->fi_desc) + 1,
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
309 feature->fi_desc, tx);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
310 if (error != 0)
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
311 return (error);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
312 }
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
313
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
314 if (action == FEATURE_ACTION_INCR && refcount == 1 && feature->fi_mos) {
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
315 spa_activate_mos_feature(dmu_objset_spa(os), feature->fi_guid);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
316 }
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
317
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
318 if (action == FEATURE_ACTION_DECR && refcount == 0) {
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
319 spa_deactivate_mos_feature(dmu_objset_spa(os),
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
320 feature->fi_guid);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
321 }
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
322
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
323 return (0);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
324 }
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
325
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
326 void
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
327 spa_feature_create_zap_objects(spa_t *spa, dmu_tx_t *tx)
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
328 {
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
329 /*
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
330 * We create feature flags ZAP objects in two instances: during pool
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
331 * creation and during pool upgrade.
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
332 */
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
333 ASSERT(dsl_pool_sync_context(spa_get_dsl(spa)) || (!spa->spa_sync_on &&
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
334 tx->tx_txg == TXG_INITIAL));
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
335
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
336 spa->spa_feat_for_read_obj = zap_create_link(spa->spa_meta_objset,
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
337 DMU_OTN_ZAP_METADATA, DMU_POOL_DIRECTORY_OBJECT,
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
338 DMU_POOL_FEATURES_FOR_READ, tx);
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
339 spa->spa_feat_for_write_obj = zap_create_link(spa->spa_meta_objset,
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
eschrock
parents:
diff changeset
340 DMU_OTN_ZAP_METADATA, DMU_POOL_DIRECTORY_OBJECT,
1949b688d5fb 2619 asynchronous destruction of ZFS file systems (missed files)
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341 DMU_POOL_FEATURES_FOR_WRITE, tx);
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342 spa->spa_feat_desc_obj = zap_create_link(spa->spa_meta_objset,
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343 DMU_OTN_ZAP_METADATA, DMU_POOL_DIRECTORY_OBJECT,
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344 DMU_POOL_FEATURE_DESCRIPTIONS, tx);
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345 }
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346
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347 /*
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348 * Enable any required dependencies, then enable the requested feature.
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349 */
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350 void
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351 spa_feature_enable(spa_t *spa, zfeature_info_t *feature, dmu_tx_t *tx)
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352 {
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353 ASSERT3U(spa_version(spa), >=, SPA_VERSION_FEATURES);
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354 VERIFY3U(0, ==, feature_do_action(spa->spa_meta_objset,
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355 spa->spa_feat_for_read_obj, spa->spa_feat_for_write_obj,
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356 spa->spa_feat_desc_obj, feature, FEATURE_ACTION_ENABLE, tx));
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357 }
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358
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359 /*
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360 * If the specified feature has not yet been enabled, this function returns
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361 * ENOTSUP; otherwise, this function increments the feature's refcount (or
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362 * returns EOVERFLOW if the refcount cannot be incremented). This function must
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363 * be called from syncing context.
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364 */
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365 void
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366 spa_feature_incr(spa_t *spa, zfeature_info_t *feature, dmu_tx_t *tx)
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367 {
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368 ASSERT3U(spa_version(spa), >=, SPA_VERSION_FEATURES);
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369 VERIFY3U(0, ==, feature_do_action(spa->spa_meta_objset,
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370 spa->spa_feat_for_read_obj, spa->spa_feat_for_write_obj,
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371 spa->spa_feat_desc_obj, feature, FEATURE_ACTION_INCR, tx));
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372 }
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373
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374 /*
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375 * If the specified feature has not yet been enabled, this function returns
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376 * ENOTSUP; otherwise, this function decrements the feature's refcount (or
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377 * returns EOVERFLOW if the refcount is already 0). This function must
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378 * be called from syncing context.
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379 */
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380 void
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381 spa_feature_decr(spa_t *spa, zfeature_info_t *feature, dmu_tx_t *tx)
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382 {
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383 ASSERT3U(spa_version(spa), >=, SPA_VERSION_FEATURES);
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384 VERIFY3U(0, ==, feature_do_action(spa->spa_meta_objset,
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385 spa->spa_feat_for_read_obj, spa->spa_feat_for_write_obj,
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386 spa->spa_feat_desc_obj, feature, FEATURE_ACTION_DECR, tx));
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387 }
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388
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389 boolean_t
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390 spa_feature_is_enabled(spa_t *spa, zfeature_info_t *feature)
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391 {
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392 int err;
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393 uint64_t refcount;
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394
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395 if (spa_version(spa) < SPA_VERSION_FEATURES)
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396 return (B_FALSE);
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397
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398 err = feature_get_refcount(spa->spa_meta_objset,
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399 spa->spa_feat_for_read_obj, spa->spa_feat_for_write_obj,
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400 feature, &refcount);
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401 ASSERT(err == 0 || err == ENOTSUP);
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402 return (err == 0);
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403 }
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404
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405 boolean_t
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406 spa_feature_is_active(spa_t *spa, zfeature_info_t *feature)
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407 {
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408 int err;
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409 uint64_t refcount;
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410
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411 if (spa_version(spa) < SPA_VERSION_FEATURES)
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412 return (B_FALSE);
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413
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414 err = feature_get_refcount(spa->spa_meta_objset,
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415 spa->spa_feat_for_read_obj, spa->spa_feat_for_write_obj,
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416 feature, &refcount);
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417 ASSERT(err == 0 || err == ENOTSUP);
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418 return (err == 0 && refcount > 0);
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419 }