| /* |
| * 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) 2018 by Delphix. All rights reserved. |
| * Copyright (c) 2018 Datto Inc. |
| */ |
| |
| #include <sys/dataset_kstats.h> |
| #include <sys/dmu_objset.h> |
| #include <sys/dsl_dataset.h> |
| #include <sys/spa.h> |
| |
| 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 = |
| aggsum_value(&dk->dk_aggsums.das_writes); |
| dkv->dkv_nwritten.value.ui64 = |
| aggsum_value(&dk->dk_aggsums.das_nwritten); |
| dkv->dkv_reads.value.ui64 = |
| aggsum_value(&dk->dk_aggsums.das_reads); |
| dkv->dkv_nread.value.ui64 = |
| aggsum_value(&dk->dk_aggsums.das_nread); |
| dkv->dkv_nunlinks.value.ui64 = |
| aggsum_value(&dk->dk_aggsums.das_nunlinks); |
| dkv->dkv_nunlinked.value.ui64 = |
| aggsum_value(&dk->dk_aggsums.das_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); |
| bcopy(&empty_dataset_kstats, dk_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; |
| |
| aggsum_init(&dk->dk_aggsums.das_writes, 0); |
| aggsum_init(&dk->dk_aggsums.das_nwritten, 0); |
| aggsum_init(&dk->dk_aggsums.das_reads, 0); |
| aggsum_init(&dk->dk_aggsums.das_nread, 0); |
| aggsum_init(&dk->dk_aggsums.das_nunlinks, 0); |
| aggsum_init(&dk->dk_aggsums.das_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; |
| |
| aggsum_fini(&dk->dk_aggsums.das_writes); |
| aggsum_fini(&dk->dk_aggsums.das_nwritten); |
| aggsum_fini(&dk->dk_aggsums.das_reads); |
| aggsum_fini(&dk->dk_aggsums.das_nread); |
| aggsum_fini(&dk->dk_aggsums.das_nunlinks); |
| aggsum_fini(&dk->dk_aggsums.das_nunlinked); |
| } |
| |
| void |
| dataset_kstats_update_write_kstats(dataset_kstats_t *dk, |
| int64_t nwritten) |
| { |
| ASSERT3S(nwritten, >=, 0); |
| |
| if (dk->dk_kstats == NULL) |
| return; |
| |
| aggsum_add(&dk->dk_aggsums.das_writes, 1); |
| aggsum_add(&dk->dk_aggsums.das_nwritten, nwritten); |
| } |
| |
| void |
| dataset_kstats_update_read_kstats(dataset_kstats_t *dk, |
| int64_t nread) |
| { |
| ASSERT3S(nread, >=, 0); |
| |
| if (dk->dk_kstats == NULL) |
| return; |
| |
| aggsum_add(&dk->dk_aggsums.das_reads, 1); |
| aggsum_add(&dk->dk_aggsums.das_nread, nread); |
| } |
| |
| void |
| dataset_kstats_update_nunlinks_kstat(dataset_kstats_t *dk, int64_t delta) |
| { |
| if (dk->dk_kstats == NULL) |
| return; |
| |
| aggsum_add(&dk->dk_aggsums.das_nunlinks, delta); |
| } |
| |
| void |
| dataset_kstats_update_nunlinked_kstat(dataset_kstats_t *dk, int64_t delta) |
| { |
| if (dk->dk_kstats == NULL) |
| return; |
| |
| aggsum_add(&dk->dk_aggsums.das_nunlinked, delta); |
| } |