static int send_named_kstat(JNIEnv* env, jclass cls, kstat_named_t* knamed) { switch (knamed->data_type) { case KSTAT_DATA_INT32: return sendNamedLong(env, cls, knamed->name, knamed->value.i32); case KSTAT_DATA_UINT32: return sendNamedLong(env, cls, knamed->name, knamed->value.ui32); case KSTAT_DATA_INT64: return sendNamedLong(env, cls, knamed->name, knamed->value.i64); case KSTAT_DATA_UINT64: return sendNamedLong(env, cls, knamed->name, knamed->value.ui64); case KSTAT_DATA_STRING: return sendNamedString(env, cls, knamed->name, KSTAT_NAMED_STR_PTR(knamed), KSTAT_NAMED_STR_BUFLEN(knamed)); case KSTAT_DATA_CHAR: // TODO: XXX HACK Don't just chop off the last character! knamed->value.c[sizeof(knamed->value.c) - 1] = 0; return sendNamedString(env, cls, knamed->name, knamed->value.c, sizeof(knamed->value.c)); } return -1; }
/* * fetchstr - return a string value from kstat. */ static void fetchstr(kstat_t *ksp, char *value, char *dest) { kstat_named_t *knp; if((knp = kstat_data_lookup(ksp, value)) != NULL) { strncpy( dest, KSTAT_NAMED_STR_PTR(knp), KSTAT_NAMED_STR_BUFLEN(knp)); } else strcpy( dest, "Unknown" ); }
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_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_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); }