214 lines
6.3 KiB
C
214 lines
6.3 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2018 by Delphix. All rights reserved.
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* Copyright (c) 2018 Datto Inc.
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*/
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#include <sys/dataset_kstats.h>
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#include <sys/dmu_objset.h>
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#include <sys/dsl_dataset.h>
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#include <sys/spa.h>
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static dataset_kstat_values_t empty_dataset_kstats = {
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{ "dataset_name", KSTAT_DATA_STRING },
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{ "writes", KSTAT_DATA_UINT64 },
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{ "nwritten", KSTAT_DATA_UINT64 },
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{ "reads", KSTAT_DATA_UINT64 },
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{ "nread", KSTAT_DATA_UINT64 },
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{ "nunlinks", KSTAT_DATA_UINT64 },
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{ "nunlinked", KSTAT_DATA_UINT64 },
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};
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static int
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dataset_kstats_update(kstat_t *ksp, int rw)
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{
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dataset_kstats_t *dk = ksp->ks_private;
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ASSERT3P(dk->dk_kstats->ks_data, ==, ksp->ks_data);
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if (rw == KSTAT_WRITE)
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return (EACCES);
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dataset_kstat_values_t *dkv = dk->dk_kstats->ks_data;
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dkv->dkv_writes.value.ui64 =
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aggsum_value(&dk->dk_aggsums.das_writes);
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dkv->dkv_nwritten.value.ui64 =
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aggsum_value(&dk->dk_aggsums.das_nwritten);
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dkv->dkv_reads.value.ui64 =
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aggsum_value(&dk->dk_aggsums.das_reads);
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dkv->dkv_nread.value.ui64 =
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aggsum_value(&dk->dk_aggsums.das_nread);
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dkv->dkv_nunlinks.value.ui64 =
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aggsum_value(&dk->dk_aggsums.das_nunlinks);
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dkv->dkv_nunlinked.value.ui64 =
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aggsum_value(&dk->dk_aggsums.das_nunlinked);
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return (0);
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}
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void
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dataset_kstats_create(dataset_kstats_t *dk, objset_t *objset)
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{
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/*
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* There should not be anything wrong with having kstats for
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* snapshots. Since we are not sure how useful they would be
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* though nor how much their memory overhead would matter in
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* a filesystem with many snapshots, we skip them for now.
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*/
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if (dmu_objset_is_snapshot(objset))
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return;
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/*
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* At the time of this writing, KSTAT_STRLEN is 255 in Linux,
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* and the spa_name can theoretically be up to 256 characters.
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* In reality though the spa_name can be 240 characters max
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* [see origin directory name check in pool_namecheck()]. Thus,
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* the naming scheme for the module name below should not cause
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* any truncations. In the event that a truncation does happen
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* though, due to some future change, we silently skip creating
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* the kstat and log the event.
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*/
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char kstat_module_name[KSTAT_STRLEN];
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int n = snprintf(kstat_module_name, sizeof (kstat_module_name),
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"zfs/%s", spa_name(dmu_objset_spa(objset)));
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if (n < 0) {
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zfs_dbgmsg("failed to create dataset kstat for objset %lld: "
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" snprintf() for kstat module name returned %d",
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(unsigned long long)dmu_objset_id(objset), n);
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return;
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} else if (n >= KSTAT_STRLEN) {
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zfs_dbgmsg("failed to create dataset kstat for objset %lld: "
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"kstat module name length (%d) exceeds limit (%d)",
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(unsigned long long)dmu_objset_id(objset),
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n, KSTAT_STRLEN);
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return;
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}
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char kstat_name[KSTAT_STRLEN];
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n = snprintf(kstat_name, sizeof (kstat_name), "objset-0x%llx",
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(unsigned long long)dmu_objset_id(objset));
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if (n < 0) {
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zfs_dbgmsg("failed to create dataset kstat for objset %lld: "
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" snprintf() for kstat name returned %d",
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(unsigned long long)dmu_objset_id(objset), n);
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return;
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}
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ASSERT3U(n, <, KSTAT_STRLEN);
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kstat_t *kstat = kstat_create(kstat_module_name, 0, kstat_name,
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"dataset", KSTAT_TYPE_NAMED,
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sizeof (empty_dataset_kstats) / sizeof (kstat_named_t),
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KSTAT_FLAG_VIRTUAL);
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if (kstat == NULL)
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return;
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dataset_kstat_values_t *dk_kstats =
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kmem_alloc(sizeof (empty_dataset_kstats), KM_SLEEP);
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bcopy(&empty_dataset_kstats, dk_kstats,
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sizeof (empty_dataset_kstats));
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char *ds_name = kmem_zalloc(ZFS_MAX_DATASET_NAME_LEN, KM_SLEEP);
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dsl_dataset_name(objset->os_dsl_dataset, ds_name);
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KSTAT_NAMED_STR_PTR(&dk_kstats->dkv_ds_name) = ds_name;
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KSTAT_NAMED_STR_BUFLEN(&dk_kstats->dkv_ds_name) =
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ZFS_MAX_DATASET_NAME_LEN;
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kstat->ks_data = dk_kstats;
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kstat->ks_update = dataset_kstats_update;
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kstat->ks_private = dk;
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kstat_install(kstat);
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dk->dk_kstats = kstat;
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aggsum_init(&dk->dk_aggsums.das_writes, 0);
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aggsum_init(&dk->dk_aggsums.das_nwritten, 0);
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aggsum_init(&dk->dk_aggsums.das_reads, 0);
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aggsum_init(&dk->dk_aggsums.das_nread, 0);
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aggsum_init(&dk->dk_aggsums.das_nunlinks, 0);
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aggsum_init(&dk->dk_aggsums.das_nunlinked, 0);
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}
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void
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dataset_kstats_destroy(dataset_kstats_t *dk)
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{
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if (dk->dk_kstats == NULL)
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return;
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dataset_kstat_values_t *dkv = dk->dk_kstats->ks_data;
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kmem_free(KSTAT_NAMED_STR_PTR(&dkv->dkv_ds_name),
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KSTAT_NAMED_STR_BUFLEN(&dkv->dkv_ds_name));
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kmem_free(dkv, sizeof (empty_dataset_kstats));
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kstat_delete(dk->dk_kstats);
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dk->dk_kstats = NULL;
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aggsum_fini(&dk->dk_aggsums.das_writes);
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aggsum_fini(&dk->dk_aggsums.das_nwritten);
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aggsum_fini(&dk->dk_aggsums.das_reads);
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aggsum_fini(&dk->dk_aggsums.das_nread);
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aggsum_fini(&dk->dk_aggsums.das_nunlinks);
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aggsum_fini(&dk->dk_aggsums.das_nunlinked);
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}
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void
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dataset_kstats_update_write_kstats(dataset_kstats_t *dk,
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int64_t nwritten)
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{
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ASSERT3S(nwritten, >=, 0);
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if (dk->dk_kstats == NULL)
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return;
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aggsum_add(&dk->dk_aggsums.das_writes, 1);
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aggsum_add(&dk->dk_aggsums.das_nwritten, nwritten);
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}
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void
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dataset_kstats_update_read_kstats(dataset_kstats_t *dk,
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int64_t nread)
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{
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ASSERT3S(nread, >=, 0);
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if (dk->dk_kstats == NULL)
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return;
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aggsum_add(&dk->dk_aggsums.das_reads, 1);
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aggsum_add(&dk->dk_aggsums.das_nread, nread);
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}
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void
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dataset_kstats_update_nunlinks_kstat(dataset_kstats_t *dk, int64_t delta)
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{
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if (dk->dk_kstats == NULL)
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return;
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aggsum_add(&dk->dk_aggsums.das_nunlinks, delta);
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}
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void
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dataset_kstats_update_nunlinked_kstat(dataset_kstats_t *dk, int64_t delta)
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{
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if (dk->dk_kstats == NULL)
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return;
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aggsum_add(&dk->dk_aggsums.das_nunlinked, delta);
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}
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