C++ spa_version函数代码示例

int
spa_history_log_nvl(spa_t *spa, nvlist_t *nvl)
{
	int err = 0;
	dmu_tx_t *tx;
	nvlist_t *nvarg;

	if (spa_version(spa) < SPA_VERSION_ZPOOL_HISTORY || !spa_writeable(spa))
		return (SET_ERROR(EINVAL));

	tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir);
	err = dmu_tx_assign(tx, TXG_WAIT);
	if (err) {
		dmu_tx_abort(tx);
		return (err);
	}

	VERIFY0(nvlist_dup(nvl, &nvarg, KM_PUSHPAGE));
	if (spa_history_zone() != NULL) {
		fnvlist_add_string(nvarg, ZPOOL_HIST_ZONE,
		    spa_history_zone());
	}
	fnvlist_add_uint64(nvarg, ZPOOL_HIST_WHO, crgetruid(CRED()));

	/* Kick this off asynchronously; errors are ignored. */
	dsl_sync_task_nowait(spa_get_dsl(spa), spa_history_log_sync,
	    nvarg, 0, tx);
	dmu_tx_commit(tx);

	/* spa_history_log_sync will free nvl */
	return (err);

}

boolean_t
dmu_objset_userused_enabled(objset_impl_t *os)
{
	return (spa_version(os->os_spa) >= SPA_VERSION_USERSPACE &&
	    used_cbs[os->os_phys->os_type] &&
	    os->os_userused_dnode);
}

int
dsl_deleg_set(const char *ddname, nvlist_t *nvp, boolean_t unset)
{
	dsl_dir_t *dd;
	int error;
	nvpair_t *whopair = NULL;
	int blocks_modified = 0;

	error = dsl_dir_open(ddname, FTAG, &dd, NULL);
	if (error)
		return (error);

	if (spa_version(dmu_objset_spa(dd->dd_pool->dp_meta_objset)) <
	    SPA_VERSION_DELEGATED_PERMS) {
		dsl_dir_close(dd, FTAG);
		return (ENOTSUP);
	}

	while ((whopair = nvlist_next_nvpair(nvp, whopair)))
		blocks_modified++;

	error = dsl_sync_task_do(dd->dd_pool, NULL,
	    unset ? dsl_deleg_unset_sync : dsl_deleg_set_sync,
	    dd, nvp, blocks_modified);
	dsl_dir_close(dd, FTAG);

	return (error);
}

int
dmu_spill_hold_existing(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp)
{
	dmu_buf_impl_t *db = (dmu_buf_impl_t *)bonus;
	dnode_t *dn;
	int err;

	DB_DNODE_ENTER(db);
	dn = DB_DNODE(db);

	if (spa_version(dn->dn_objset->os_spa) < SPA_VERSION_SA) {
		err = EINVAL;
	} else {
		rw_enter(&dn->dn_struct_rwlock, RW_READER);

		if (!dn->dn_have_spill) {
			err = ENOENT;
		} else {
			err = dmu_spill_hold_by_dnode(dn,
			    DB_RF_HAVESTRUCT | DB_RF_CANFAIL, tag, dbp);
		}

		rw_exit(&dn->dn_struct_rwlock);
	}

	DB_DNODE_EXIT(db);
	return (err);
}

boolean_t
dmu_objset_userused_enabled(objset_t *os)
{
	return (spa_version(os->os_spa) >= SPA_VERSION_USERSPACE &&
	    used_cbs[os->os_phys->os_type] != NULL &&
	    DMU_USERUSED_DNODE(os) != NULL);
}

int
dsl_destroy_snapshot_check_impl(dsl_dataset_t *ds, boolean_t defer)
{
	if (!ds->ds_is_snapshot)
		return (SET_ERROR(EINVAL));

	if (dsl_dataset_long_held(ds))
		return (SET_ERROR(EBUSY));

	/*
	 * Only allow deferred destroy on pools that support it.
	 * NOTE: deferred destroy is only supported on snapshots.
	 */
	if (defer) {
		if (spa_version(ds->ds_dir->dd_pool->dp_spa) <
		    SPA_VERSION_USERREFS)
			return (SET_ERROR(ENOTSUP));
		return (0);
	}

	/*
	 * If this snapshot has an elevated user reference count,
	 * we can't destroy it yet.
	 */
	if (ds->ds_userrefs > 0)
		return (SET_ERROR(EBUSY));

	/*
	 * Can't delete a branch point.
	 */
	if (dsl_dataset_phys(ds)->ds_num_children > 1)
		return (SET_ERROR(EEXIST));

	return (0);
}

void
dsl_prop_check_prediction(dsl_dir_t *dd, dsl_prop_setarg_t *psa)
{
	zfs_prop_t prop = zfs_name_to_prop(psa->psa_name);
	uint64_t intval;
	char setpoint[MAXNAMELEN];
	uint64_t version = spa_version(dd->dd_pool->dp_spa);
	int err;

	if (version < SPA_VERSION_RECVD_PROPS) {
		switch (prop) {
		case ZFS_PROP_QUOTA:
		case ZFS_PROP_RESERVATION:
			return;
		default:
			break;
		}
	}

	err = dsl_prop_get_dd(dd, psa->psa_name, 8, 1, &intval,
	    setpoint, B_FALSE);
	if (err == 0 && intval != psa->psa_effective_value) {
		cmn_err(CE_PANIC, "%s property, source: %x, "
		    "predicted effective value: %llu, "
		    "actual effective value: %llu (setpoint: %s)",
		    psa->psa_name, psa->psa_source,
		    (unsigned long long)psa->psa_effective_value,
		    (unsigned long long)intval, setpoint);
	}
}

void
dsl_destroy_snapshot_sync_impl(dsl_dataset_t *ds, boolean_t defer, dmu_tx_t *tx)
{
#ifdef ZFS_DEBUG
	int err;
#endif
	int after_branch_point = FALSE;
	dsl_pool_t *dp = ds->ds_dir->dd_pool;
	objset_t *mos = dp->dp_meta_objset;
	dsl_dataset_t *ds_prev = NULL;
	uint64_t obj, old_unique, used = 0, comp = 0, uncomp = 0;
	dsl_dataset_t *ds_next, *ds_head, *hds;


	ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
	ASSERT3U(ds->ds_phys->ds_bp.blk_birth, <=, tx->tx_txg);
	ASSERT(refcount_is_zero(&ds->ds_longholds));

	if (defer &&
	    (ds->ds_userrefs > 0 || ds->ds_phys->ds_num_children > 1)) {
		ASSERT(spa_version(dp->dp_spa) >= SPA_VERSION_USERREFS);
		dmu_buf_will_dirty(ds->ds_dbuf, tx);
		ds->ds_phys->ds_flags |= DS_FLAG_DEFER_DESTROY;
		spa_history_log_internal_ds(ds, "defer_destroy", tx, "");
		return;
	}

	ASSERT3U(ds->ds_phys->ds_num_children, <=, 1);

	/* We need to log before removing it from the namespace. */
	spa_history_log_internal_ds(ds, "destroy", tx, "");

	dsl_scan_ds_destroyed(ds, tx);

	obj = ds->ds_object;

	if (ds->ds_phys->ds_prev_snap_obj != 0) {
		ASSERT3P(ds->ds_prev, ==, NULL);
		VERIFY0(dsl_dataset_hold_obj(dp,
		    ds->ds_phys->ds_prev_snap_obj, FTAG, &ds_prev));
		after_branch_point =
		    (ds_prev->ds_phys->ds_next_snap_obj != obj);

		dmu_buf_will_dirty(ds_prev->ds_dbuf, tx);
		if (after_branch_point &&
		    ds_prev->ds_phys->ds_next_clones_obj != 0) {
			dsl_dataset_remove_from_next_clones(ds_prev, obj, tx);
			if (ds->ds_phys->ds_next_snap_obj != 0) {
				VERIFY0(zap_add_int(mos,
				    ds_prev->ds_phys->ds_next_clones_obj,
				    ds->ds_phys->ds_next_snap_obj, tx));
			}
		}
		if (!after_branch_point) {
			ds_prev->ds_phys->ds_next_snap_obj =
			    ds->ds_phys->ds_next_snap_obj;
		}
	}

void
spa_history_log_version(spa_t *spa, const char *operation)
{
	spa_history_log_internal(spa, operation, NULL,
	    "pool version %llu; software version %llu/%d; uts %s %s %s %s",
	    (u_longlong_t)spa_version(spa), SPA_VERSION, ZPL_VERSION,
	    utsname.nodename, utsname.release, utsname.version,
	    utsname.machine);
}

void
spa_history_log_version(spa_t *spa, const char *operation, dmu_tx_t *tx)
{
	utsname_t *u = utsname();

	spa_history_log_internal(spa, operation, tx,
	    "pool version %llu; software version %llu/%llu; uts %s %s %s %s",
	    (u_longlong_t)spa_version(spa), SPA_VERSION, ZPL_VERSION,
	    u->nodename, u->release, u->version, u->machine);
}

uint64_t
bplist_create(objset_t *mos, int blocksize, dmu_tx_t *tx)
{
	int size;

	size = spa_version(dmu_objset_spa(mos)) < SPA_VERSION_BPLIST_ACCOUNT ?
	    BPLIST_SIZE_V0 : sizeof (bplist_phys_t);

	return (dmu_object_alloc(mos, DMU_OT_BPLIST, blocksize,
	    DMU_OT_BPLIST_HDR, size, tx));
}

int
zfs_set_version(zfs_sb_t *zsb, uint64_t newvers)
{
	int error;
	objset_t *os = zsb->z_os;
	dmu_tx_t *tx;

	if (newvers < ZPL_VERSION_INITIAL || newvers > ZPL_VERSION)
		return (SET_ERROR(EINVAL));

	if (newvers < zsb->z_version)
		return (SET_ERROR(EINVAL));

	if (zfs_spa_version_map(newvers) >
	    spa_version(dmu_objset_spa(zsb->z_os)))
		return (SET_ERROR(ENOTSUP));

	tx = dmu_tx_create(os);
	dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_FALSE, ZPL_VERSION_STR);
	if (newvers >= ZPL_VERSION_SA && !zsb->z_use_sa) {
		dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE,
		    ZFS_SA_ATTRS);
		dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
	}
	error = dmu_tx_assign(tx, TXG_WAIT);
	if (error) {
		dmu_tx_abort(tx);
		return (error);
	}

	error = zap_update(os, MASTER_NODE_OBJ, ZPL_VERSION_STR,
	    8, 1, &newvers, tx);

	if (error) {
		dmu_tx_commit(tx);
		return (error);
	}

	if (newvers >= ZPL_VERSION_SA && !zsb->z_use_sa) {
		uint64_t sa_obj;

		ASSERT3U(spa_version(dmu_objset_spa(zsb->z_os)), >=,
		    SPA_VERSION_SA);
		sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE,
		    DMU_OT_NONE, 0, tx);

		error = zap_add(os, MASTER_NODE_OBJ,
		    ZFS_SA_ATTRS, 8, 1, &sa_obj, tx);
		ASSERT0(error);

		VERIFY(0 == sa_set_sa_object(os, sa_obj));
		sa_register_update_callback(os, zfs_sa_upgrade);
	}

static int
dsl_dataset_user_hold_check(void *arg, dmu_tx_t *tx)
{
	dsl_dataset_user_hold_arg_t *dduha = arg;
	dsl_pool_t *dp = dmu_tx_pool(tx);
	nvpair_t *pair;

	if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS)
		return (SET_ERROR(ENOTSUP));

	if (!dmu_tx_is_syncing(tx))
		return (0);

	for (pair = nvlist_next_nvpair(dduha->dduha_holds, NULL);
	    pair != NULL; pair = nvlist_next_nvpair(dduha->dduha_holds, pair)) {
		dsl_dataset_t *ds;
		int error = 0;
		char *htag, *name;

		/* must be a snapshot */
		name = nvpair_name(pair);
		if (strchr(name, '@') == NULL)
			error = SET_ERROR(EINVAL);

		if (error == 0)
			error = nvpair_value_string(pair, &htag);

		if (error == 0)
			error = dsl_dataset_hold(dp, name, FTAG, &ds);

		if (error == 0) {
			error = dsl_dataset_user_hold_check_one(ds, htag,
			    dduha->dduha_minor != 0, tx);
			dsl_dataset_rele(ds, FTAG);
		}

		if (error == 0) {
			fnvlist_add_string(dduha->dduha_chkholds, name, htag);
		} else {
			/*
			 * We register ENOENT errors so they can be correctly
			 * reported if needed, such as when all holds fail.
			 */
			fnvlist_add_int32(dduha->dduha_errlist, name, error);
			if (error != ENOENT)
				return (error);
		}
	}

	return (0);
}

void
spa_history_log_version(spa_t *spa, const char *operation)
{
#ifdef _KERNEL
	uint64_t current_vers = spa_version(spa);

	spa_history_log_internal(spa, operation, NULL,
	    "pool version %llu; software version %llu/%d; uts %s %s %s %s",
	    (u_longlong_t)current_vers, SPA_VERSION, ZPL_VERSION,
	    utsname.nodename, utsname.release, utsname.version,
	    utsname.machine);
	cmn_err(CE_CONT, "!%s version %llu pool %s using %llu", operation,
	    (u_longlong_t)current_vers, spa_name(spa), SPA_VERSION);
#endif
}

/*
 * Generate the pool's configuration based on the current in-core state.
 * We infer whether to generate a complete config or just one top-level config
 * based on whether vd is the root vdev.
 */
nvlist_t *
spa_config_generate(spa_t *spa, vdev_t *vd, uint64_t txg, int getstats)
{
	nvlist_t *config, *nvroot;
	vdev_t *rvd = spa->spa_root_vdev;

	ASSERT(spa_config_held(spa, RW_READER));

	if (vd == NULL)
		vd = rvd;

	/*
	 * If txg is -1, report the current value of spa->spa_config_txg.
	 */
	if (txg == -1ULL)
		txg = spa->spa_config_txg;

	VERIFY(nvlist_alloc(&config, NV_UNIQUE_NAME, KM_SLEEP) == 0);

	VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_VERSION,
	    spa_version(spa)) == 0);
	VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME,
	    spa_name(spa)) == 0);
	VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE,
	    spa_state(spa)) == 0);
	VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_TXG,
	    txg) == 0);
	VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_GUID,
	    spa_guid(spa)) == 0);

	if (vd != rvd) {
		VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_TOP_GUID,
		    vd->vdev_top->vdev_guid) == 0);
		VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_GUID,
		    vd->vdev_guid) == 0);
		if (vd->vdev_isspare)
			VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_IS_SPARE,
			    1ULL) == 0);
		vd = vd->vdev_top;		/* label contains top config */
	}

	nvroot = vdev_config_generate(spa, vd, getstats, B_FALSE);
	VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, nvroot) == 0);
	nvlist_free(nvroot);

	return (config);
}