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📄 Makefile.in(4.57 KB)
📄 THIRDPARTYLICENSE.cityhash(1.03 KB)
📄 THIRDPARTYLICENSE.cityhash.descrip(39 B)
📄 abd.c(31.72 KB)
📄 aggsum.c(8.46 KB)
📄 arc.c(330.91 KB)
📄 blkptr.c(4.26 KB)
📄 bplist.c(2.38 KB)
📄 bpobj.c(27.82 KB)
📄 bptree.c(8.2 KB)
📄 bqueue.c(4.7 KB)
📄 btree.c(65.19 KB)
📄 dataset_kstats.c(6.32 KB)
📄 dbuf.c(141.84 KB)
📄 dbuf_stats.c(6.05 KB)
📄 ddt.c(28.01 KB)
📄 ddt_zap.c(4.38 KB)
📄 dmu.c(60.44 KB)
📄 dmu_diff.c(6.25 KB)
📄 dmu_object.c(14.73 KB)
📄 dmu_objset.c(79.38 KB)
📄 dmu_recv.c(98.69 KB)
📄 dmu_redact.c(37.09 KB)
📄 dmu_send.c(95.51 KB)
📄 dmu_traverse.c(21.98 KB)
📄 dmu_tx.c(40.13 KB)
📄 dmu_zfetch.c(13.56 KB)
📄 dnode.c(71.32 KB)
📄 dnode_sync.c(24.93 KB)
📄 dsl_bookmark.c(51.22 KB)
📄 dsl_crypt.c(78.06 KB)
📄 dsl_dataset.c(141.61 KB)
📄 dsl_deadlist.c(27.94 KB)
📄 dsl_deleg.c(19.92 KB)
📄 dsl_destroy.c(36.73 KB)
📄 dsl_dir.c(65.45 KB)
📄 dsl_pool.c(42.92 KB)
📄 dsl_prop.c(32.88 KB)
📄 dsl_scan.c(134.47 KB)
📄 dsl_synctask.c(7.94 KB)
📄 dsl_userhold.c(18.26 KB)
📄 edonr_zfs.c(3.21 KB)
📄 fm.c(39.75 KB)
📄 gzip.c(2.57 KB)
📄 hkdf.c(4.5 KB)
📄 lz4.c(26.46 KB)
📄 lzjb.c(3.85 KB)
📄 metaslab.c(190.62 KB)
📄 mmp.c(24.93 KB)
📄 multilist.c(12.21 KB)
📄 objlist.c(2.58 KB)
📄 pathname.c(2.52 KB)
📄 range_tree.c(24.9 KB)
📄 refcount.c(7.82 KB)
📄 rrwlock.c(10.82 KB)
📄 sa.c(59.23 KB)
📄 sha256.c(2.89 KB)
📄 skein_zfs.c(2.92 KB)
📄 spa.c(272.81 KB)
📄 spa_boot.c(1.28 KB)
📄 spa_checkpoint.c(21.54 KB)
📄 spa_config.c(16.97 KB)
📄 spa_errlog.c(11.35 KB)
📄 spa_history.c(17.75 KB)
📄 spa_log_spacemap.c(47.13 KB)
📄 spa_misc.c(75.4 KB)
📄 spa_stats.c(27.08 KB)
📄 space_map.c(31.45 KB)
📄 space_reftree.c(4.21 KB)
📄 txg.c(27.49 KB)
📄 uberblock.c(2.17 KB)
📄 unique.c(2.53 KB)
📄 vdev.c(143.91 KB)
📄 vdev_cache.c(11.71 KB)
📄 vdev_draid.c(96.86 KB)
📄 vdev_draid_rand.c(1.16 KB)
📄 vdev_indirect.c(60.83 KB)
📄 vdev_indirect_births.c(5.88 KB)
📄 vdev_indirect_mapping.c(18.06 KB)
📄 vdev_initialize.c(22.38 KB)
📄 vdev_label.c(57.52 KB)
📄 vdev_mirror.c(26.76 KB)
📄 vdev_missing.c(3.74 KB)
📄 vdev_queue.c(37.61 KB)
📄 vdev_raidz.c(76.09 KB)
📄 vdev_raidz_math.c(17.18 KB)
📄 vdev_raidz_math_aarch64_neon.c(112.13 KB)
📄 vdev_raidz_math_aarch64_neon_common.h(23.64 KB)
📄 vdev_raidz_math_aarch64_neonx2.c(5.39 KB)
📄 vdev_raidz_math_avx2.c(10.64 KB)
📄 vdev_raidz_math_avx512bw.c(10.93 KB)
📄 vdev_raidz_math_avx512f.c(17.9 KB)
📄 vdev_raidz_math_impl.h(34.78 KB)
📄 vdev_raidz_math_powerpc_altivec.c(213.46 KB)
📄 vdev_raidz_math_powerpc_altivec_common.h(22.62 KB)
📄 vdev_raidz_math_scalar.c(9.54 KB)
📄 vdev_raidz_math_sse2.c(25.84 KB)
📄 vdev_raidz_math_ssse3.c(118 KB)
📄 vdev_rebuild.c(34.65 KB)
📄 vdev_removal.c(72.08 KB)
📄 vdev_root.c(4.28 KB)
📄 vdev_trim.c(50.92 KB)
📄 zap.c(35.35 KB)
📄 zap_leaf.c(22.75 KB)
📄 zap_micro.c(42.18 KB)
📄 zcp.c(42.29 KB)
📄 zcp_get.c(21.01 KB)
📄 zcp_global.c(1.9 KB)
📄 zcp_iter.c(18.21 KB)
📄 zcp_set.c(2.37 KB)
📄 zcp_synctask.c(13.69 KB)
📄 zfeature.c(17.6 KB)
📄 zfs_byteswap.c(5.64 KB)
📄 zfs_fm.c(40.58 KB)
📄 zfs_fuid.c(19.69 KB)
📄 zfs_ioctl.c(195.48 KB)
📄 zfs_log.c(20.6 KB)
📄 zfs_onexit.c(5.09 KB)
📄 zfs_quota.c(12.93 KB)
📄 zfs_ratelimit.c(2.35 KB)
📄 zfs_replay.c(26.11 KB)
📄 zfs_rlock.c(20.38 KB)
📄 zfs_sa.c(13.09 KB)
📄 zfs_vnops.c(22 KB)
📄 zil.c(111.32 KB)
📄 zio.c(144.72 KB)
📄 zio_checksum.c(17.28 KB)
📄 zio_compress.c(5.92 KB)
📄 zio_inject.c(25.79 KB)
📄 zle.c(2.52 KB)
📄 zrlock.c(4.45 KB)
📄 zthr.c(16.41 KB)
📄 zvol.c(42.96 KB)

Editing: dataset_kstats.c

/*
 * 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);
}

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Editing: dataset_kstats.c

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