/* * 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 https://opensource.org/licenses/CDDL-1.0. * 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) 2018 by Delphix. All rights reserved. * Copyright (c) 2018 Datto Inc. */ #include #include #include #include static dataset_kstat_values_t empty_dataset_kstats = { { "dataset_name", KSTAT_DATA_STRING }, { "writes", KSTAT_DATA_UINT64 }, { "nwritten", KSTAT_DATA_UINT64 }, { "reads", KSTAT_DATA_UINT64 }, { "nread", KSTAT_DATA_UINT64 }, { "nunlinks", KSTAT_DATA_UINT64 }, { "nunlinked", KSTAT_DATA_UINT64 }, }; static int dataset_kstats_update(kstat_t *ksp, int rw) { dataset_kstats_t *dk = ksp->ks_private; ASSERT3P(dk->dk_kstats->ks_data, ==, ksp->ks_data); if (rw == KSTAT_WRITE) return (EACCES); dataset_kstat_values_t *dkv = dk->dk_kstats->ks_data; dkv->dkv_writes.value.ui64 = wmsum_value(&dk->dk_sums.dss_writes); dkv->dkv_nwritten.value.ui64 = wmsum_value(&dk->dk_sums.dss_nwritten); dkv->dkv_reads.value.ui64 = wmsum_value(&dk->dk_sums.dss_reads); dkv->dkv_nread.value.ui64 = wmsum_value(&dk->dk_sums.dss_nread); dkv->dkv_nunlinks.value.ui64 = wmsum_value(&dk->dk_sums.dss_nunlinks); dkv->dkv_nunlinked.value.ui64 = wmsum_value(&dk->dk_sums.dss_nunlinked); return (0); } void dataset_kstats_create(dataset_kstats_t *dk, objset_t *objset) { /* * There should not be anything wrong with having kstats for * snapshots. Since we are not sure how useful they would be * though nor how much their memory overhead would matter in * a filesystem with many snapshots, we skip them for now. */ if (dmu_objset_is_snapshot(objset)) return; /* * At the time of this writing, KSTAT_STRLEN is 255 in Linux, * and the spa_name can theoretically be up to 256 characters. * In reality though the spa_name can be 240 characters max * [see origin directory name check in pool_namecheck()]. Thus, * the naming scheme for the module name below should not cause * any truncations. In the event that a truncation does happen * though, due to some future change, we silently skip creating * the kstat and log the event. */ char kstat_module_name[KSTAT_STRLEN]; int n = snprintf(kstat_module_name, sizeof (kstat_module_name), "zfs/%s", spa_name(dmu_objset_spa(objset))); if (n < 0) { zfs_dbgmsg("failed to create dataset kstat for objset %lld: " " snprintf() for kstat module name returned %d", (unsigned long long)dmu_objset_id(objset), n); return; } else if (n >= KSTAT_STRLEN) { zfs_dbgmsg("failed to create dataset kstat for objset %lld: " "kstat module name length (%d) exceeds limit (%d)", (unsigned long long)dmu_objset_id(objset), n, KSTAT_STRLEN); return; } char kstat_name[KSTAT_STRLEN]; n = snprintf(kstat_name, sizeof (kstat_name), "objset-0x%llx", (unsigned long long)dmu_objset_id(objset)); if (n < 0) { zfs_dbgmsg("failed to create dataset kstat for objset %lld: " " snprintf() for kstat name returned %d", (unsigned long long)dmu_objset_id(objset), n); return; } ASSERT3U(n, <, KSTAT_STRLEN); kstat_t *kstat = kstat_create(kstat_module_name, 0, kstat_name, "dataset", KSTAT_TYPE_NAMED, sizeof (empty_dataset_kstats) / sizeof (kstat_named_t), KSTAT_FLAG_VIRTUAL); if (kstat == NULL) return; dataset_kstat_values_t *dk_kstats = kmem_alloc(sizeof (empty_dataset_kstats), KM_SLEEP); memcpy(dk_kstats, &empty_dataset_kstats, sizeof (empty_dataset_kstats)); char *ds_name = kmem_zalloc(ZFS_MAX_DATASET_NAME_LEN, KM_SLEEP); dsl_dataset_name(objset->os_dsl_dataset, ds_name); KSTAT_NAMED_STR_PTR(&dk_kstats->dkv_ds_name) = ds_name; KSTAT_NAMED_STR_BUFLEN(&dk_kstats->dkv_ds_name) = ZFS_MAX_DATASET_NAME_LEN; kstat->ks_data = dk_kstats; kstat->ks_update = dataset_kstats_update; kstat->ks_private = dk; kstat->ks_data_size += ZFS_MAX_DATASET_NAME_LEN; kstat_install(kstat); dk->dk_kstats = kstat; wmsum_init(&dk->dk_sums.dss_writes, 0); wmsum_init(&dk->dk_sums.dss_nwritten, 0); wmsum_init(&dk->dk_sums.dss_reads, 0); wmsum_init(&dk->dk_sums.dss_nread, 0); wmsum_init(&dk->dk_sums.dss_nunlinks, 0); wmsum_init(&dk->dk_sums.dss_nunlinked, 0); } void dataset_kstats_destroy(dataset_kstats_t *dk) { if (dk->dk_kstats == NULL) return; dataset_kstat_values_t *dkv = dk->dk_kstats->ks_data; kmem_free(KSTAT_NAMED_STR_PTR(&dkv->dkv_ds_name), KSTAT_NAMED_STR_BUFLEN(&dkv->dkv_ds_name)); kmem_free(dkv, sizeof (empty_dataset_kstats)); kstat_delete(dk->dk_kstats); dk->dk_kstats = NULL; wmsum_fini(&dk->dk_sums.dss_writes); wmsum_fini(&dk->dk_sums.dss_nwritten); wmsum_fini(&dk->dk_sums.dss_reads); wmsum_fini(&dk->dk_sums.dss_nread); wmsum_fini(&dk->dk_sums.dss_nunlinks); wmsum_fini(&dk->dk_sums.dss_nunlinked); } void dataset_kstats_update_write_kstats(dataset_kstats_t *dk, int64_t nwritten) { ASSERT3S(nwritten, >=, 0); if (dk->dk_kstats == NULL) return; wmsum_add(&dk->dk_sums.dss_writes, 1); wmsum_add(&dk->dk_sums.dss_nwritten, nwritten); } void dataset_kstats_update_read_kstats(dataset_kstats_t *dk, int64_t nread) { ASSERT3S(nread, >=, 0); if (dk->dk_kstats == NULL) return; wmsum_add(&dk->dk_sums.dss_reads, 1); wmsum_add(&dk->dk_sums.dss_nread, nread); } void dataset_kstats_update_nunlinks_kstat(dataset_kstats_t *dk, int64_t delta) { if (dk->dk_kstats == NULL) return; wmsum_add(&dk->dk_sums.dss_nunlinks, delta); } void dataset_kstats_update_nunlinked_kstat(dataset_kstats_t *dk, int64_t delta) { if (dk->dk_kstats == NULL) return; wmsum_add(&dk->dk_sums.dss_nunlinked, delta); }