1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or https://opensource.org/licenses/CDDL-1.0. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright (c) 2018 by Delphix. All rights reserved. 24 * Copyright (c) 2018 Datto Inc. 25 */ 26 27 #include <sys/dataset_kstats.h> 28 #include <sys/dmu_objset.h> 29 #include <sys/dsl_dataset.h> 30 #include <sys/spa.h> 31 32 static dataset_kstat_values_t empty_dataset_kstats = { 33 { "dataset_name", KSTAT_DATA_STRING }, 34 { "writes", KSTAT_DATA_UINT64 }, 35 { "nwritten", KSTAT_DATA_UINT64 }, 36 { "reads", KSTAT_DATA_UINT64 }, 37 { "nread", KSTAT_DATA_UINT64 }, 38 { "nunlinks", KSTAT_DATA_UINT64 }, 39 { "nunlinked", KSTAT_DATA_UINT64 }, 40 { 41 { "zil_commit_count", KSTAT_DATA_UINT64 }, 42 { "zil_commit_writer_count", KSTAT_DATA_UINT64 }, 43 { "zil_itx_count", KSTAT_DATA_UINT64 }, 44 { "zil_itx_indirect_count", KSTAT_DATA_UINT64 }, 45 { "zil_itx_indirect_bytes", KSTAT_DATA_UINT64 }, 46 { "zil_itx_copied_count", KSTAT_DATA_UINT64 }, 47 { "zil_itx_copied_bytes", KSTAT_DATA_UINT64 }, 48 { "zil_itx_needcopy_count", KSTAT_DATA_UINT64 }, 49 { "zil_itx_needcopy_bytes", KSTAT_DATA_UINT64 }, 50 { "zil_itx_metaslab_normal_count", KSTAT_DATA_UINT64 }, 51 { "zil_itx_metaslab_normal_bytes", KSTAT_DATA_UINT64 }, 52 { "zil_itx_metaslab_slog_count", KSTAT_DATA_UINT64 }, 53 { "zil_itx_metaslab_slog_bytes", KSTAT_DATA_UINT64 } 54 } 55 }; 56 57 static int 58 dataset_kstats_update(kstat_t *ksp, int rw) 59 { 60 dataset_kstats_t *dk = ksp->ks_private; 61 dataset_kstat_values_t *dkv = ksp->ks_data; 62 ASSERT3P(dk->dk_kstats->ks_data, ==, dkv); 63 64 if (rw == KSTAT_WRITE) 65 return (EACCES); 66 67 dkv->dkv_writes.value.ui64 = 68 wmsum_value(&dk->dk_sums.dss_writes); 69 dkv->dkv_nwritten.value.ui64 = 70 wmsum_value(&dk->dk_sums.dss_nwritten); 71 dkv->dkv_reads.value.ui64 = 72 wmsum_value(&dk->dk_sums.dss_reads); 73 dkv->dkv_nread.value.ui64 = 74 wmsum_value(&dk->dk_sums.dss_nread); 75 dkv->dkv_nunlinks.value.ui64 = 76 wmsum_value(&dk->dk_sums.dss_nunlinks); 77 dkv->dkv_nunlinked.value.ui64 = 78 wmsum_value(&dk->dk_sums.dss_nunlinked); 79 80 zil_kstat_values_update(&dkv->dkv_zil_stats, &dk->dk_zil_sums); 81 82 return (0); 83 } 84 85 int 86 dataset_kstats_create(dataset_kstats_t *dk, objset_t *objset) 87 { 88 /* 89 * There should not be anything wrong with having kstats for 90 * snapshots. Since we are not sure how useful they would be 91 * though nor how much their memory overhead would matter in 92 * a filesystem with many snapshots, we skip them for now. 93 */ 94 if (dmu_objset_is_snapshot(objset)) 95 return (0); 96 97 /* 98 * At the time of this writing, KSTAT_STRLEN is 255 in Linux, 99 * and the spa_name can theoretically be up to 256 characters. 100 * In reality though the spa_name can be 240 characters max 101 * [see origin directory name check in pool_namecheck()]. Thus, 102 * the naming scheme for the module name below should not cause 103 * any truncations. In the event that a truncation does happen 104 * though, due to some future change, we silently skip creating 105 * the kstat and log the event. 106 */ 107 char kstat_module_name[KSTAT_STRLEN]; 108 int n = snprintf(kstat_module_name, sizeof (kstat_module_name), 109 "zfs/%s", spa_name(dmu_objset_spa(objset))); 110 if (n < 0) { 111 zfs_dbgmsg("failed to create dataset kstat for objset %lld: " 112 " snprintf() for kstat module name returned %d", 113 (unsigned long long)dmu_objset_id(objset), n); 114 return (SET_ERROR(EINVAL)); 115 } else if (n >= KSTAT_STRLEN) { 116 zfs_dbgmsg("failed to create dataset kstat for objset %lld: " 117 "kstat module name length (%d) exceeds limit (%d)", 118 (unsigned long long)dmu_objset_id(objset), 119 n, KSTAT_STRLEN); 120 return (SET_ERROR(ENAMETOOLONG)); 121 } 122 123 char kstat_name[KSTAT_STRLEN]; 124 n = snprintf(kstat_name, sizeof (kstat_name), "objset-0x%llx", 125 (unsigned long long)dmu_objset_id(objset)); 126 if (n < 0) { 127 zfs_dbgmsg("failed to create dataset kstat for objset %lld: " 128 " snprintf() for kstat name returned %d", 129 (unsigned long long)dmu_objset_id(objset), n); 130 return (SET_ERROR(EINVAL)); 131 } 132 ASSERT3U(n, <, KSTAT_STRLEN); 133 134 kstat_t *kstat = kstat_create(kstat_module_name, 0, kstat_name, 135 "dataset", KSTAT_TYPE_NAMED, 136 sizeof (empty_dataset_kstats) / sizeof (kstat_named_t), 137 KSTAT_FLAG_VIRTUAL); 138 if (kstat == NULL) 139 return (SET_ERROR(ENOMEM)); 140 141 dataset_kstat_values_t *dk_kstats = 142 kmem_alloc(sizeof (empty_dataset_kstats), KM_SLEEP); 143 memcpy(dk_kstats, &empty_dataset_kstats, 144 sizeof (empty_dataset_kstats)); 145 146 char *ds_name = kmem_zalloc(ZFS_MAX_DATASET_NAME_LEN, KM_SLEEP); 147 dsl_dataset_name(objset->os_dsl_dataset, ds_name); 148 KSTAT_NAMED_STR_PTR(&dk_kstats->dkv_ds_name) = ds_name; 149 KSTAT_NAMED_STR_BUFLEN(&dk_kstats->dkv_ds_name) = 150 ZFS_MAX_DATASET_NAME_LEN; 151 152 kstat->ks_data = dk_kstats; 153 kstat->ks_update = dataset_kstats_update; 154 kstat->ks_private = dk; 155 kstat->ks_data_size += ZFS_MAX_DATASET_NAME_LEN; 156 157 wmsum_init(&dk->dk_sums.dss_writes, 0); 158 wmsum_init(&dk->dk_sums.dss_nwritten, 0); 159 wmsum_init(&dk->dk_sums.dss_reads, 0); 160 wmsum_init(&dk->dk_sums.dss_nread, 0); 161 wmsum_init(&dk->dk_sums.dss_nunlinks, 0); 162 wmsum_init(&dk->dk_sums.dss_nunlinked, 0); 163 zil_sums_init(&dk->dk_zil_sums); 164 165 dk->dk_kstats = kstat; 166 kstat_install(kstat); 167 return (0); 168 } 169 170 void 171 dataset_kstats_destroy(dataset_kstats_t *dk) 172 { 173 if (dk->dk_kstats == NULL) 174 return; 175 176 dataset_kstat_values_t *dkv = dk->dk_kstats->ks_data; 177 kstat_delete(dk->dk_kstats); 178 dk->dk_kstats = NULL; 179 kmem_free(KSTAT_NAMED_STR_PTR(&dkv->dkv_ds_name), 180 KSTAT_NAMED_STR_BUFLEN(&dkv->dkv_ds_name)); 181 kmem_free(dkv, sizeof (empty_dataset_kstats)); 182 183 wmsum_fini(&dk->dk_sums.dss_writes); 184 wmsum_fini(&dk->dk_sums.dss_nwritten); 185 wmsum_fini(&dk->dk_sums.dss_reads); 186 wmsum_fini(&dk->dk_sums.dss_nread); 187 wmsum_fini(&dk->dk_sums.dss_nunlinks); 188 wmsum_fini(&dk->dk_sums.dss_nunlinked); 189 zil_sums_fini(&dk->dk_zil_sums); 190 } 191 192 void 193 dataset_kstats_update_write_kstats(dataset_kstats_t *dk, 194 int64_t nwritten) 195 { 196 ASSERT3S(nwritten, >=, 0); 197 198 if (dk->dk_kstats == NULL) 199 return; 200 201 wmsum_add(&dk->dk_sums.dss_writes, 1); 202 wmsum_add(&dk->dk_sums.dss_nwritten, nwritten); 203 } 204 205 void 206 dataset_kstats_update_read_kstats(dataset_kstats_t *dk, 207 int64_t nread) 208 { 209 ASSERT3S(nread, >=, 0); 210 211 if (dk->dk_kstats == NULL) 212 return; 213 214 wmsum_add(&dk->dk_sums.dss_reads, 1); 215 wmsum_add(&dk->dk_sums.dss_nread, nread); 216 } 217 218 void 219 dataset_kstats_update_nunlinks_kstat(dataset_kstats_t *dk, int64_t delta) 220 { 221 if (dk->dk_kstats == NULL) 222 return; 223 224 wmsum_add(&dk->dk_sums.dss_nunlinks, delta); 225 } 226 227 void 228 dataset_kstats_update_nunlinked_kstat(dataset_kstats_t *dk, int64_t delta) 229 { 230 if (dk->dk_kstats == NULL) 231 return; 232 233 wmsum_add(&dk->dk_sums.dss_nunlinked, delta); 234 } 235