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📄 Makefile.in(4.57 KB)
📄 THIRDPARTYLICENSE.cityhash(1.03 KB)
📄 THIRDPARTYLICENSE.cityhash.descrip(39 B)
📄 abd.c(31.72 KB)
📄 aggsum.c(8.46 KB)
📄 arc.c(330.91 KB)
📄 blkptr.c(4.26 KB)
📄 bplist.c(2.38 KB)
📄 bpobj.c(27.82 KB)
📄 bptree.c(8.2 KB)
📄 bqueue.c(4.7 KB)
📄 btree.c(65.19 KB)
📄 dataset_kstats.c(6.32 KB)
📄 dbuf.c(141.84 KB)
📄 dbuf_stats.c(6.05 KB)
📄 ddt.c(28.01 KB)
📄 ddt_zap.c(4.38 KB)
📄 dmu.c(60.44 KB)
📄 dmu_diff.c(6.25 KB)
📄 dmu_object.c(14.73 KB)
📄 dmu_objset.c(79.38 KB)
📄 dmu_recv.c(98.69 KB)
📄 dmu_redact.c(37.09 KB)
📄 dmu_send.c(95.51 KB)
📄 dmu_traverse.c(21.98 KB)
📄 dmu_tx.c(40.13 KB)
📄 dmu_zfetch.c(13.56 KB)
📄 dnode.c(71.32 KB)
📄 dnode_sync.c(24.93 KB)
📄 dsl_bookmark.c(51.22 KB)
📄 dsl_crypt.c(78.06 KB)
📄 dsl_dataset.c(141.61 KB)
📄 dsl_deadlist.c(27.94 KB)
📄 dsl_deleg.c(19.92 KB)
📄 dsl_destroy.c(36.73 KB)
📄 dsl_dir.c(65.45 KB)
📄 dsl_pool.c(42.92 KB)
📄 dsl_prop.c(32.88 KB)
📄 dsl_scan.c(134.47 KB)
📄 dsl_synctask.c(7.94 KB)
📄 dsl_userhold.c(18.26 KB)
📄 edonr_zfs.c(3.21 KB)
📄 fm.c(39.75 KB)
📄 gzip.c(2.57 KB)
📄 hkdf.c(4.5 KB)
📄 lz4.c(26.46 KB)
📄 lzjb.c(3.85 KB)
📄 metaslab.c(190.62 KB)
📄 mmp.c(24.93 KB)
📄 multilist.c(12.21 KB)
📄 objlist.c(2.58 KB)
📄 pathname.c(2.52 KB)
📄 range_tree.c(24.9 KB)
📄 refcount.c(7.82 KB)
📄 rrwlock.c(10.82 KB)
📄 sa.c(59.23 KB)
📄 sha256.c(2.89 KB)
📄 skein_zfs.c(2.92 KB)
📄 spa.c(272.81 KB)
📄 spa_boot.c(1.28 KB)
📄 spa_checkpoint.c(21.54 KB)
📄 spa_config.c(16.97 KB)
📄 spa_errlog.c(11.35 KB)
📄 spa_history.c(17.75 KB)
📄 spa_log_spacemap.c(47.13 KB)
📄 spa_misc.c(75.4 KB)
📄 spa_stats.c(27.08 KB)
📄 space_map.c(31.45 KB)
📄 space_reftree.c(4.21 KB)
📄 txg.c(27.49 KB)
📄 uberblock.c(2.17 KB)
📄 unique.c(2.53 KB)
📄 vdev.c(143.91 KB)
📄 vdev_cache.c(11.71 KB)
📄 vdev_draid.c(96.86 KB)
📄 vdev_draid_rand.c(1.16 KB)
📄 vdev_indirect.c(60.83 KB)
📄 vdev_indirect_births.c(5.88 KB)
📄 vdev_indirect_mapping.c(18.06 KB)
📄 vdev_initialize.c(22.38 KB)
📄 vdev_label.c(57.52 KB)
📄 vdev_mirror.c(26.76 KB)
📄 vdev_missing.c(3.74 KB)
📄 vdev_queue.c(37.61 KB)
📄 vdev_raidz.c(76.09 KB)
📄 vdev_raidz_math.c(17.18 KB)
📄 vdev_raidz_math_aarch64_neon.c(112.13 KB)
📄 vdev_raidz_math_aarch64_neon_common.h(23.64 KB)
📄 vdev_raidz_math_aarch64_neonx2.c(5.39 KB)
📄 vdev_raidz_math_avx2.c(10.64 KB)
📄 vdev_raidz_math_avx512bw.c(10.93 KB)
📄 vdev_raidz_math_avx512f.c(17.9 KB)
📄 vdev_raidz_math_impl.h(34.78 KB)
📄 vdev_raidz_math_powerpc_altivec.c(213.46 KB)
📄 vdev_raidz_math_powerpc_altivec_common.h(22.62 KB)
📄 vdev_raidz_math_scalar.c(9.54 KB)
📄 vdev_raidz_math_sse2.c(25.84 KB)
📄 vdev_raidz_math_ssse3.c(118 KB)
📄 vdev_rebuild.c(34.65 KB)
📄 vdev_removal.c(72.08 KB)
📄 vdev_root.c(4.28 KB)
📄 vdev_trim.c(50.92 KB)
📄 zap.c(35.35 KB)
📄 zap_leaf.c(22.75 KB)
📄 zap_micro.c(42.18 KB)
📄 zcp.c(42.29 KB)
📄 zcp_get.c(21.01 KB)
📄 zcp_global.c(1.9 KB)
📄 zcp_iter.c(18.21 KB)
📄 zcp_set.c(2.37 KB)
📄 zcp_synctask.c(13.69 KB)
📄 zfeature.c(17.6 KB)
📄 zfs_byteswap.c(5.64 KB)
📄 zfs_fm.c(40.58 KB)
📄 zfs_fuid.c(19.69 KB)
📄 zfs_ioctl.c(195.48 KB)
📄 zfs_log.c(20.6 KB)
📄 zfs_onexit.c(5.09 KB)
📄 zfs_quota.c(12.93 KB)
📄 zfs_ratelimit.c(2.35 KB)
📄 zfs_replay.c(26.11 KB)
📄 zfs_rlock.c(20.38 KB)
📄 zfs_sa.c(13.09 KB)
📄 zfs_vnops.c(22 KB)
📄 zil.c(111.32 KB)
📄 zio.c(144.72 KB)
📄 zio_checksum.c(17.28 KB)
📄 zio_compress.c(5.92 KB)
📄 zio_inject.c(25.79 KB)
📄 zle.c(2.52 KB)
📄 zrlock.c(4.45 KB)
📄 zthr.c(16.41 KB)
📄 zvol.c(42.96 KB)

Editing: zfeature.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 2011, 2015 by Delphix. All rights reserved.
 */

#include <sys/zfs_context.h>
#include <sys/zfeature.h>
#include <sys/dmu.h>
#include <sys/nvpair.h>
#include <sys/zap.h>
#include <sys/dmu_tx.h>
#include "zfeature_common.h"
#include <sys/spa_impl.h>

/*
 * ZFS Feature Flags
 * -----------------
 *
 * ZFS feature flags are used to provide fine-grained versioning to the ZFS
 * on-disk format. Once enabled on a pool feature flags replace the old
 * spa_version() number.
 *
 * Each new on-disk format change will be given a uniquely identifying string
 * GUID rather than a version number. This avoids the problem of different
 * organizations creating new on-disk formats with the same version number. To
 * keep feature GUIDs unique they should consist of the reverse dns name of the
 * organization which implemented the feature and a short name for the feature,
 * separated by a colon (e.g. com.delphix:async_destroy).
 *
 * Reference Counts
 * ----------------
 *
 * Within each pool features can be in one of three states: disabled, enabled,
 * or active. These states are differentiated by a reference count stored on
 * disk for each feature:
 *
 *   1) If there is no reference count stored on disk the feature is disabled.
 *   2) If the reference count is 0 a system administrator has enabled the
 *      feature, but the feature has not been used yet, so no on-disk
 *      format changes have been made.
 *   3) If the reference count is greater than 0 the feature is active.
 *      The format changes required by the feature are currently on disk.
 *      Note that if the feature's format changes are reversed the feature
 *      may choose to set its reference count back to 0.
 *
 * Feature flags makes no differentiation between non-zero reference counts
 * for an active feature (e.g. a reference count of 1 means the same thing as a
 * reference count of 27834721), but feature implementations may choose to use
 * the reference count to store meaningful information. For example, a new RAID
 * implementation might set the reference count to the number of vdevs using
 * it. If all those disks are removed from the pool the feature goes back to
 * having a reference count of 0.
 *
 * It is the responsibility of the individual features to maintain a non-zero
 * reference count as long as the feature's format changes are present on disk.
 *
 * Dependencies
 * ------------
 *
 * Each feature may depend on other features. The only effect of this
 * relationship is that when a feature is enabled all of its dependencies are
 * automatically enabled as well. Any future work to support disabling of
 * features would need to ensure that features cannot be disabled if other
 * enabled features depend on them.
 *
 * On-disk Format
 * --------------
 *
 * When feature flags are enabled spa_version() is set to SPA_VERSION_FEATURES
 * (5000). In order for this to work the pool is automatically upgraded to
 * SPA_VERSION_BEFORE_FEATURES (28) first, so all pre-feature flags on disk
 * format changes will be in use.
 *
 * Information about features is stored in 3 ZAP objects in the pool's MOS.
 * These objects are linked to by the following names in the pool directory
 * object:
 *
 * 1) features_for_read: feature GUID -> reference count
 *    Features needed to open the pool for reading.
 * 2) features_for_write: feature GUID -> reference count
 *    Features needed to open the pool for writing.
 * 3) feature_descriptions: feature GUID -> descriptive string
 *    A human readable string.
 *
 * All enabled features appear in either features_for_read or
 * features_for_write, but not both.
 *
 * To open a pool in read-only mode only the features listed in
 * features_for_read need to be supported.
 *
 * To open the pool in read-write mode features in both features_for_read and
 * features_for_write need to be supported.
 *
 * Some features may be required to read the ZAP objects containing feature
 * information. To allow software to check for compatibility with these features
 * before the pool is opened their names must be stored in the label in a
 * new "features_for_read" entry (note that features that are only required
 * to write to a pool never need to be stored in the label since the
 * features_for_write ZAP object can be read before the pool is written to).
 * To save space in the label features must be explicitly marked as needing to
 * be written to the label. Also, reference counts are not stored in the label,
 * instead any feature whose reference count drops to 0 is removed from the
 * label.
 *
 * Adding New Features
 * -------------------
 *
 * Features must be registered in zpool_feature_init() function in
 * zfeature_common.c using the zfeature_register() function. This function
 * has arguments to specify if the feature should be stored in the
 * features_for_read or features_for_write ZAP object and if it needs to be
 * written to the label when active.
 *
 * Once a feature is registered it will appear as a "feature@<feature name>"
 * property which can be set by an administrator. Feature implementors should
 * use the spa_feature_is_enabled() and spa_feature_is_active() functions to
 * query the state of a feature and the spa_feature_incr() and
 * spa_feature_decr() functions to change an enabled feature's reference count.
 * Reference counts may only be updated in the syncing context.
 *
 * Features may not perform enable-time initialization. Instead, any such
 * initialization should occur when the feature is first used. This design
 * enforces that on-disk changes be made only when features are used. Code
 * should only check if a feature is enabled using spa_feature_is_enabled(),
 * not by relying on any feature specific metadata existing. If a feature is
 * enabled, but the feature's metadata is not on disk yet then it should be
 * created as needed.
 *
 * As an example, consider the com.delphix:async_destroy feature. This feature
 * relies on the existence of a bptree in the MOS that store blocks for
 * asynchronous freeing. This bptree is not created when async_destroy is
 * enabled. Instead, when a dataset is destroyed spa_feature_is_enabled() is
 * called to check if async_destroy is enabled. If it is and the bptree object
 * does not exist yet, the bptree object is created as part of the dataset
 * destroy and async_destroy's reference count is incremented to indicate it
 * has made an on-disk format change. Later, after the destroyed dataset's
 * blocks have all been asynchronously freed there is no longer any use for the
 * bptree object, so it is destroyed and async_destroy's reference count is
 * decremented back to 0 to indicate that it has undone its on-disk format
 * changes.
 */

typedef enum {
	FEATURE_ACTION_INCR,
	FEATURE_ACTION_DECR,
} feature_action_t;

/*
 * Checks that the active features in the pool are supported by
 * this software.  Adds each unsupported feature (name -> description) to
 * the supplied nvlist.
 */
boolean_t
spa_features_check(spa_t *spa, boolean_t for_write,
    nvlist_t *unsup_feat, nvlist_t *enabled_feat)
{
	objset_t *os = spa->spa_meta_objset;
	boolean_t supported;
	zap_cursor_t *zc;
	zap_attribute_t *za;
	uint64_t obj = for_write ?
	    spa->spa_feat_for_write_obj : spa->spa_feat_for_read_obj;
	char *buf;

zc = kmem_alloc(sizeof (zap_cursor_t), KM_SLEEP);
	za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
	buf = kmem_alloc(MAXPATHLEN, KM_SLEEP);

supported = B_TRUE;
	for (zap_cursor_init(zc, os, obj);
	    zap_cursor_retrieve(zc, za) == 0;
	    zap_cursor_advance(zc)) {
		ASSERT(za->za_integer_length == sizeof (uint64_t) &&
		    za->za_num_integers == 1);

if (NULL != enabled_feat) {
			fnvlist_add_uint64(enabled_feat, za->za_name,
			    za->za_first_integer);
		}

if (za->za_first_integer != 0 &&
		    !zfeature_is_supported(za->za_name)) {
			supported = B_FALSE;

if (NULL != unsup_feat) {
				const char *desc = "";

if (zap_lookup(os, spa->spa_feat_desc_obj,
				    za->za_name, 1, MAXPATHLEN, buf) == 0)
					desc = buf;

VERIFY(nvlist_add_string(unsup_feat,
				    za->za_name, desc) == 0);
			}
		}
	}
	zap_cursor_fini(zc);

kmem_free(buf, MAXPATHLEN);
	kmem_free(za, sizeof (zap_attribute_t));
	kmem_free(zc, sizeof (zap_cursor_t));

return (supported);
}

/*
 * Use an in-memory cache of feature refcounts for quick retrieval.
 *
 * Note: well-designed features will not need to use this; they should
 * use spa_feature_is_enabled() and spa_feature_is_active() instead.
 * However, this is non-static for zdb, zhack, and spa_add_feature_stats().
 */
int
feature_get_refcount(spa_t *spa, zfeature_info_t *feature, uint64_t *res)
{
	ASSERT(VALID_FEATURE_FID(feature->fi_feature));
	if (spa->spa_feat_refcount_cache[feature->fi_feature] ==
	    SPA_FEATURE_DISABLED) {
		return (SET_ERROR(ENOTSUP));
	}
	*res = spa->spa_feat_refcount_cache[feature->fi_feature];
	return (0);
}

/*
 * Note: well-designed features will not need to use this; they should
 * use spa_feature_is_enabled() and spa_feature_is_active() instead.
 * However, this is non-static for zdb and zhack.
 */
int
feature_get_refcount_from_disk(spa_t *spa, zfeature_info_t *feature,
    uint64_t *res)
{
	int err;
	uint64_t refcount;
	uint64_t zapobj = (feature->fi_flags & ZFEATURE_FLAG_READONLY_COMPAT) ?
	    spa->spa_feat_for_write_obj : spa->spa_feat_for_read_obj;

/*
	 * If the pool is currently being created, the feature objects may not
	 * have been allocated yet.  Act as though all features are disabled.
	 */
	if (zapobj == 0)
		return (SET_ERROR(ENOTSUP));

err = zap_lookup(spa->spa_meta_objset, zapobj,
	    feature->fi_guid, sizeof (uint64_t), 1, &refcount);
	if (err != 0) {
		if (err == ENOENT)
			return (SET_ERROR(ENOTSUP));
		else
			return (err);
	}
	*res = refcount;
	return (0);
}

static int
feature_get_enabled_txg(spa_t *spa, zfeature_info_t *feature, uint64_t *res)
{
	uint64_t enabled_txg_obj __maybe_unused = spa->spa_feat_enabled_txg_obj;

ASSERT(zfeature_depends_on(feature->fi_feature,
	    SPA_FEATURE_ENABLED_TXG));

if (!spa_feature_is_enabled(spa, feature->fi_feature)) {
		return (SET_ERROR(ENOTSUP));
	}

ASSERT(enabled_txg_obj != 0);

VERIFY0(zap_lookup(spa->spa_meta_objset, spa->spa_feat_enabled_txg_obj,
	    feature->fi_guid, sizeof (uint64_t), 1, res));

return (0);
}

/*
 * This function is non-static for zhack; it should otherwise not be used
 * outside this file.
 */
void
feature_sync(spa_t *spa, zfeature_info_t *feature, uint64_t refcount,
    dmu_tx_t *tx)
{
	ASSERT(VALID_FEATURE_OR_NONE(feature->fi_feature));
	uint64_t zapobj = (feature->fi_flags & ZFEATURE_FLAG_READONLY_COMPAT) ?
	    spa->spa_feat_for_write_obj : spa->spa_feat_for_read_obj;
	VERIFY0(zap_update(spa->spa_meta_objset, zapobj, feature->fi_guid,
	    sizeof (uint64_t), 1, &refcount, tx));

/*
	 * feature_sync is called directly from zhack, allowing the
	 * creation of arbitrary features whose fi_feature field may
	 * be greater than SPA_FEATURES. When called from zhack, the
	 * zfeature_info_t object's fi_feature field will be set to
	 * SPA_FEATURE_NONE.
	 */
	if (feature->fi_feature != SPA_FEATURE_NONE) {
		uint64_t *refcount_cache =
		    &spa->spa_feat_refcount_cache[feature->fi_feature];
		VERIFY3U(*refcount_cache, ==,
		    atomic_swap_64(refcount_cache, refcount));
	}

if (refcount == 0)
		spa_deactivate_mos_feature(spa, feature->fi_guid);
	else if (feature->fi_flags & ZFEATURE_FLAG_MOS)
		spa_activate_mos_feature(spa, feature->fi_guid, tx);
}

/*
 * This function is non-static for zhack; it should otherwise not be used
 * outside this file.
 */
void
feature_enable_sync(spa_t *spa, zfeature_info_t *feature, dmu_tx_t *tx)
{
	uint64_t initial_refcount =
	    (feature->fi_flags & ZFEATURE_FLAG_ACTIVATE_ON_ENABLE) ? 1 : 0;
	uint64_t zapobj = (feature->fi_flags & ZFEATURE_FLAG_READONLY_COMPAT) ?
	    spa->spa_feat_for_write_obj : spa->spa_feat_for_read_obj;

ASSERT(0 != zapobj);
	ASSERT(zfeature_is_valid_guid(feature->fi_guid));
	ASSERT3U(spa_version(spa), >=, SPA_VERSION_FEATURES);

/*
	 * If the feature is already enabled, ignore the request.
	 */
	if (zap_contains(spa->spa_meta_objset, zapobj, feature->fi_guid) == 0)
		return;

for (int i = 0; feature->fi_depends[i] != SPA_FEATURE_NONE; i++)
		spa_feature_enable(spa, feature->fi_depends[i], tx);

VERIFY0(zap_update(spa->spa_meta_objset, spa->spa_feat_desc_obj,
	    feature->fi_guid, 1, strlen(feature->fi_desc) + 1,
	    feature->fi_desc, tx));

feature_sync(spa, feature, initial_refcount, tx);

if (spa_feature_is_enabled(spa, SPA_FEATURE_ENABLED_TXG)) {
		uint64_t enabling_txg = dmu_tx_get_txg(tx);

if (spa->spa_feat_enabled_txg_obj == 0ULL) {
			spa->spa_feat_enabled_txg_obj =
			    zap_create_link(spa->spa_meta_objset,
			    DMU_OTN_ZAP_METADATA, DMU_POOL_DIRECTORY_OBJECT,
			    DMU_POOL_FEATURE_ENABLED_TXG, tx);
		}
		spa_feature_incr(spa, SPA_FEATURE_ENABLED_TXG, tx);

VERIFY0(zap_add(spa->spa_meta_objset,
		    spa->spa_feat_enabled_txg_obj, feature->fi_guid,
		    sizeof (uint64_t), 1, &enabling_txg, tx));
	}

/*
	 * Errata #4 is mostly a problem with encrypted datasets, but it
	 * is also a problem where the old encryption feature did not
	 * depend on the bookmark_v2 feature. If the pool does not have
	 * any encrypted datasets we can resolve this issue simply by
	 * enabling this dependency.
	 */
	if (spa->spa_errata == ZPOOL_ERRATA_ZOL_8308_ENCRYPTION &&
	    spa_feature_is_enabled(spa, SPA_FEATURE_ENCRYPTION) &&
	    !spa_feature_is_active(spa, SPA_FEATURE_ENCRYPTION) &&
	    feature->fi_feature == SPA_FEATURE_BOOKMARK_V2)
		spa->spa_errata = 0;
}

static void
feature_do_action(spa_t *spa, spa_feature_t fid, feature_action_t action,
    dmu_tx_t *tx)
{
	uint64_t refcount = 0;
	zfeature_info_t *feature = &spa_feature_table[fid];
	uint64_t zapobj __maybe_unused =
	    (feature->fi_flags & ZFEATURE_FLAG_READONLY_COMPAT) ?
	    spa->spa_feat_for_write_obj : spa->spa_feat_for_read_obj;

ASSERT(VALID_FEATURE_FID(fid));
	ASSERT(0 != zapobj);
	ASSERT(zfeature_is_valid_guid(feature->fi_guid));

ASSERT(dmu_tx_is_syncing(tx));
	ASSERT3U(spa_version(spa), >=, SPA_VERSION_FEATURES);

VERIFY3U(feature_get_refcount(spa, feature, &refcount), !=, ENOTSUP);

switch (action) {
	case FEATURE_ACTION_INCR:
		VERIFY3U(refcount, !=, UINT64_MAX);
		refcount++;
		break;
	case FEATURE_ACTION_DECR:
		VERIFY3U(refcount, !=, 0);
		refcount--;
		break;
	default:
		ASSERT(0);
		break;
	}

feature_sync(spa, feature, refcount, tx);
}

void
spa_feature_create_zap_objects(spa_t *spa, dmu_tx_t *tx)
{
	/*
	 * We create feature flags ZAP objects in two instances: during pool
	 * creation and during pool upgrade.
	 */
	ASSERT((!spa->spa_sync_on && tx->tx_txg == TXG_INITIAL) ||
	    dsl_pool_sync_context(spa_get_dsl(spa)));

spa->spa_feat_for_read_obj = zap_create_link(spa->spa_meta_objset,
	    DMU_OTN_ZAP_METADATA, DMU_POOL_DIRECTORY_OBJECT,
	    DMU_POOL_FEATURES_FOR_READ, tx);
	spa->spa_feat_for_write_obj = zap_create_link(spa->spa_meta_objset,
	    DMU_OTN_ZAP_METADATA, DMU_POOL_DIRECTORY_OBJECT,
	    DMU_POOL_FEATURES_FOR_WRITE, tx);
	spa->spa_feat_desc_obj = zap_create_link(spa->spa_meta_objset,
	    DMU_OTN_ZAP_METADATA, DMU_POOL_DIRECTORY_OBJECT,
	    DMU_POOL_FEATURE_DESCRIPTIONS, tx);
}

/*
 * Enable any required dependencies, then enable the requested feature.
 */
void
spa_feature_enable(spa_t *spa, spa_feature_t fid, dmu_tx_t *tx)
{
	ASSERT3U(spa_version(spa), >=, SPA_VERSION_FEATURES);
	ASSERT(VALID_FEATURE_FID(fid));
	feature_enable_sync(spa, &spa_feature_table[fid], tx);
}

void
spa_feature_incr(spa_t *spa, spa_feature_t fid, dmu_tx_t *tx)
{
	feature_do_action(spa, fid, FEATURE_ACTION_INCR, tx);
}

void
spa_feature_decr(spa_t *spa, spa_feature_t fid, dmu_tx_t *tx)
{
	feature_do_action(spa, fid, FEATURE_ACTION_DECR, tx);
}

boolean_t
spa_feature_is_enabled(spa_t *spa, spa_feature_t fid)
{
	int err;
	uint64_t refcount = 0;

ASSERT(VALID_FEATURE_FID(fid));
	if (spa_version(spa) < SPA_VERSION_FEATURES)
		return (B_FALSE);

err = feature_get_refcount(spa, &spa_feature_table[fid], &refcount);
	ASSERT(err == 0 || err == ENOTSUP);
	return (err == 0);
}

boolean_t
spa_feature_is_active(spa_t *spa, spa_feature_t fid)
{
	int err;
	uint64_t refcount = 0;

ASSERT(VALID_FEATURE_FID(fid));
	if (spa_version(spa) < SPA_VERSION_FEATURES)
		return (B_FALSE);

err = feature_get_refcount(spa, &spa_feature_table[fid], &refcount);
	ASSERT(err == 0 || err == ENOTSUP);
	return (err == 0 && refcount > 0);
}

/*
 * For the feature specified by fid (which must depend on
 * SPA_FEATURE_ENABLED_TXG), return the TXG at which it was enabled in the
 * OUT txg argument.
 *
 * Returns B_TRUE if the feature is enabled, in which case txg will be filled
 * with the transaction group in which the specified feature was enabled.
 * Returns B_FALSE otherwise (i.e. if the feature is not enabled).
 */
boolean_t
spa_feature_enabled_txg(spa_t *spa, spa_feature_t fid, uint64_t *txg)
{
	int err;

ASSERT(VALID_FEATURE_FID(fid));
	if (spa_version(spa) < SPA_VERSION_FEATURES)
		return (B_FALSE);

err = feature_get_enabled_txg(spa, &spa_feature_table[fid], txg);
	ASSERT(err == 0 || err == ENOTSUP);

return (err == 0);
}

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