MFOpenZFS: Introduce read/write kstats per dataset

The following patch introduces a few statistics on reads and writes
grouped by dataset. These statistics are implemented as kstats
(backed by aggregate sums for performance) and can be retrieved by
using the dataset objset ID number. The motivation for this change is
to provide some preliminary analytics on dataset usage/performance.

Reviewed-by: Richard Elling <Richard.Elling@RichardElling.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Signed-off-by: Serapheim Dimitropoulos <serapheim@delphix.com>

openzfs/zfs@a448a2557ec4938ed6944c7766fe0b8e6e5f6456

Also contains parts of:
MFOpenZFS: Connect dataset_kstats for FreeBSD

Example output:
kstat.zfs/mypool.dataset.objset-0x10b.nread: 150528
kstat.zfs/mypool.dataset.objset-0x10b.reads: 48
kstat.zfs/mypool.dataset.objset-0x10b.nwritten: 134217728
kstat.zfs/mypool.dataset.objset-0x10b.writes: 1024
kstat.zfs/mypool.dataset.objset-0x10b.dataset_name: mypool/datasetname

Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed by: Sean Eric Fagan <sef@ixsystems.com>
Reviewed-by: Serapheim Dimitropoulos <serapheim@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Allan Jude <allan@klarasystems.com>

openzfs/zfs@4547fc4e071ceb1818b3a46c3035b923e06e5390

This is a direct commit to stable/12 because they do not exist in
illumos upstream ZFS and needed to be heavily modified to work in
stable/12

Relnotes:	yes
Sponsored by:	Klara Inc.

1 files changed, 3 insertions, 0 deletions

diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/zfs_vfsops.h b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/zfs_vfsops.h
index bbfb79ce24d3..0868d9440528 100644
--- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/zfs_vfsops.h
+++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/zfs_vfsops.h
@@ -20,6 +20,7 @@
  */
 /*
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2018 by Delphix. All rights reserved.
  * Copyright (c) 2011 Pawel Jakub Dawidek <pawel@dawidek.net>.
  * All rights reserved.
  */
@@ -27,6 +28,7 @@
 #ifndef	_SYS_FS_ZFS_VFSOPS_H
 #define	_SYS_FS_ZFS_VFSOPS_H
 
+#include <sys/dataset_kstats.h>
 #include <sys/list.h>
 #include <sys/vfs.h>
 #include <sys/zil.h>
@@ -80,6 +82,7 @@ struct zfsvfs {
 	boolean_t	z_use_namecache;/* make use of FreeBSD name cache */
 	uint64_t	z_version;	/* ZPL version */
 	uint64_t	z_shares_dir;	/* hidden shares dir */
+	dataset_kstats_t	z_kstat;	/* fs kstats */
 	kmutex_t	z_lock;
 	uint64_t	z_userquota_obj;
 	uint64_t	z_groupquota_obj;