sys-fs/{spl,zfs} : kernel patch not needed for userland

2 files changed, 0 insertions, 1394 deletions

diff --git a/sys-fs/zfs-utils/files/kernel-4.18.patch b/sys-fs/zfs-utils/files/kernel-4.18.patch
deleted file mode 100644
index ef8d648d..00000000
--- a/sys-fs/zfs-utils/files/kernel-4.18.patch
+++ /dev/null
@@ -1,1393 +0,0 @@
-From 3cf6af50e0bc02b294bf974a8e653e12c40b5263 Mon Sep 17 00:00:00 2001
-From: Brian Behlendorf <behlendorf1@llnl.gov>
-Date: Sun, 12 Aug 2018 18:22:03 -0400
-Subject: [PATCH] Linux 4.18 compat: inode timespec -> timespec64
-
-Commit torvalds/linux@95582b0 changes the inode i_atime, i_mtime,
-and i_ctime members form timespec's to timespec64's to make them
-2038 safe.  As part of this change the current_time() function was
-also updated to return the timespec64 type.
-
-Resolve this issue by introducing a new inode_timespec_t type which
-is defined to match the timespec type used by the inode.  It should
-be used when working with inode timestamps to ensure matching types.
-
-The timestruc_t type under Illumos was used in a similar fashion but
-was specified to always be a timespec_t.  Rather than incorrectly
-define this type all timespec_t types have been replaced by the new
-inode_timespec_t type.
-
-Finally, the kernel and user space 'sys/time.h' headers were aligned
-with each other.  They define as appropriate for the context several
-constants as macros and include static inline implementation of
-gethrestime(), gethrestime_sec(), and gethrtime().
-
-Reviewed-by: Chunwei Chen <tuxoko@gmail.com>
-Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
-Closes #7643
-Backported-by: Richard Yao <ryao@gentoo.org>
----
- config/kernel-current-time.m4 |  7 +++---
- include/sys/dmu.h             |  2 +-
- include/sys/dmu_objset.h      |  2 +-
- include/sys/dsl_dir.h         |  4 ++--
- include/sys/spa_impl.h        |  2 +-
- include/sys/xvattr.h          |  2 +-
- include/sys/zfs_context.h     |  9 +------
- include/sys/zfs_znode.h       | 33 ++++++++++++++++++-------
- include/sys/zpl.h             |  9 +++++++
- lib/libspl/Makefile.am        |  2 --
- lib/libspl/gethrestime.c      | 38 -----------------------------
- lib/libspl/gethrtime.c        | 45 -----------------------------------
- lib/libspl/include/sys/time.h | 37 +++++++++++++++++++++-------
- lib/libzpool/kernel.c         |  4 ++--
- module/zfs/dmu_objset.c       |  2 +-
- module/zfs/dsl_dir.c          |  6 ++---
- module/zfs/fm.c               |  2 +-
- module/zfs/zfs_ctldir.c       |  2 +-
- module/zfs/zfs_vnops.c        |  4 ++--
- module/zfs/zfs_znode.c        |  4 ++--
- module/zfs/zpl_inode.c        |  5 ++--
- 21 files changed, 88 insertions(+), 133 deletions(-)
- delete mode 100644 lib/libspl/gethrestime.c
- delete mode 100644 lib/libspl/gethrtime.c
-
-diff --git a/config/kernel-current-time.m4 b/config/kernel-current-time.m4
-index 2ede9ff38c4..c7d5c9b5200 100644
---- a/config/kernel-current-time.m4
-+++ b/config/kernel-current-time.m4
-@@ -1,15 +1,14 @@
- dnl #
- dnl # 4.9, current_time() added
-+dnl # 4.18, return type changed from timespec to timespec64
- dnl #
- AC_DEFUN([ZFS_AC_KERNEL_CURRENT_TIME],
- 	[AC_MSG_CHECKING([whether current_time() exists])
- 	ZFS_LINUX_TRY_COMPILE_SYMBOL([
- 		#include <linux/fs.h>
- 	], [
--		struct inode ip;
--		struct timespec now __attribute__ ((unused));
--
--		now = current_time(&ip);
-+		struct inode ip __attribute__ ((unused));
-+		ip.i_atime = current_time(&ip);
- 	], [current_time], [fs/inode.c], [
- 		AC_MSG_RESULT(yes)
- 		AC_DEFINE(HAVE_CURRENT_TIME, 1, [current_time() exists])
-diff --git a/include/sys/dmu.h b/include/sys/dmu.h
-index bcdf7d646fb..755a90561ae 100644
---- a/include/sys/dmu.h
-+++ b/include/sys/dmu.h
-@@ -891,7 +891,7 @@ uint64_t dmu_objset_fsid_guid(objset_t *os);
- /*
-  * Get the [cm]time for an objset's snapshot dir
-  */
--timestruc_t dmu_objset_snap_cmtime(objset_t *os);
-+inode_timespec_t dmu_objset_snap_cmtime(objset_t *os);
- 
- int dmu_objset_is_snapshot(objset_t *os);
- 
-diff --git a/include/sys/dmu_objset.h b/include/sys/dmu_objset.h
-index a836e03722c..531e81d4d88 100644
---- a/include/sys/dmu_objset.h
-+++ b/include/sys/dmu_objset.h
-@@ -179,7 +179,7 @@ int dmu_objset_find_dp(struct dsl_pool *dp, uint64_t ddobj,
-     int func(struct dsl_pool *, struct dsl_dataset *, void *),
-     void *arg, int flags);
- void dmu_objset_evict_dbufs(objset_t *os);
--timestruc_t dmu_objset_snap_cmtime(objset_t *os);
-+inode_timespec_t dmu_objset_snap_cmtime(objset_t *os);
- 
- /* called from dsl */
- void dmu_objset_sync(objset_t *os, zio_t *zio, dmu_tx_t *tx);
-diff --git a/include/sys/dsl_dir.h b/include/sys/dsl_dir.h
-index 69b0b6a5355..80e83fdc4d3 100644
---- a/include/sys/dsl_dir.h
-+++ b/include/sys/dsl_dir.h
-@@ -103,7 +103,7 @@ struct dsl_dir {
- 	/* Protected by dd_lock */
- 	kmutex_t dd_lock;
- 	list_t dd_props; /* list of dsl_prop_record_t's */
--	timestruc_t dd_snap_cmtime; /* last time snapshot namespace changed */
-+	inode_timespec_t dd_snap_cmtime; /* last snapshot namespace change */
- 	uint64_t dd_origin_txg;
- 
- 	/* gross estimate of space used by in-flight tx's */
-@@ -159,7 +159,7 @@ boolean_t dsl_dir_is_clone(dsl_dir_t *dd);
- void dsl_dir_new_refreservation(dsl_dir_t *dd, struct dsl_dataset *ds,
-     uint64_t reservation, cred_t *cr, dmu_tx_t *tx);
- void dsl_dir_snap_cmtime_update(dsl_dir_t *dd);
--timestruc_t dsl_dir_snap_cmtime(dsl_dir_t *dd);
-+inode_timespec_t dsl_dir_snap_cmtime(dsl_dir_t *dd);
- void dsl_dir_set_reservation_sync_impl(dsl_dir_t *dd, uint64_t value,
-     dmu_tx_t *tx);
- void dsl_dir_zapify(dsl_dir_t *dd, dmu_tx_t *tx);
-diff --git a/include/sys/spa_impl.h b/include/sys/spa_impl.h
-index b1e78c1d592..fa7490ace67 100644
---- a/include/sys/spa_impl.h
-+++ b/include/sys/spa_impl.h
-@@ -153,7 +153,7 @@ struct spa {
- 	uint64_t	spa_freeze_txg;		/* freeze pool at this txg */
- 	uint64_t	spa_load_max_txg;	/* best initial ub_txg */
- 	uint64_t	spa_claim_max_txg;	/* highest claimed birth txg */
--	timespec_t	spa_loaded_ts;		/* 1st successful open time */
-+	inode_timespec_t spa_loaded_ts;		/* 1st successful open time */
- 	objset_t	*spa_meta_objset;	/* copy of dp->dp_meta_objset */
- 	kmutex_t	spa_evicting_os_lock;	/* Evicting objset list lock */
- 	list_t		spa_evicting_os_list;	/* Objsets being evicted. */
-diff --git a/include/sys/xvattr.h b/include/sys/xvattr.h
-index 4779b632163..5d38927cd4b 100644
---- a/include/sys/xvattr.h
-+++ b/include/sys/xvattr.h
-@@ -47,7 +47,7 @@
-  * Structure of all optional attributes.
-  */
- typedef struct xoptattr {
--	timestruc_t	xoa_createtime;	/* Create time of file */
-+	inode_timespec_t xoa_createtime;	/* Create time of file */
- 	uint8_t		xoa_archive;
- 	uint8_t		xoa_system;
- 	uint8_t		xoa_readonly;
-diff --git a/include/sys/zfs_context.h b/include/sys/zfs_context.h
-index 4fe35342dee..68c58f95531 100644
---- a/include/sys/zfs_context.h
-+++ b/include/sys/zfs_context.h
-@@ -527,7 +527,7 @@ extern char *vn_dumpdir;
- #define	AV_SCANSTAMP_SZ	32		/* length of anti-virus scanstamp */
- 
- typedef struct xoptattr {
--	timestruc_t	xoa_createtime;	/* Create time of file */
-+	inode_timespec_t xoa_createtime;	/* Create time of file */
- 	uint8_t		xoa_archive;
- 	uint8_t		xoa_system;
- 	uint8_t		xoa_readonly;
-@@ -640,13 +640,6 @@ extern void delay(clock_t ticks);
- #define	USEC_TO_TICK(usec)	((usec) / (MICROSEC / hz))
- #define	NSEC_TO_TICK(usec)	((usec) / (NANOSEC / hz))
- 
--#define	gethrestime_sec() time(NULL)
--#define	gethrestime(t) \
--	do {\
--		(t)->tv_sec = gethrestime_sec();\
--		(t)->tv_nsec = 0;\
--	} while (0);
--
- #define	max_ncpus	64
- #define	boot_ncpus	(sysconf(_SC_NPROCESSORS_ONLN))
- 
-diff --git a/include/sys/zfs_znode.h b/include/sys/zfs_znode.h
-index c292f03739e..26d1eb37557 100644
---- a/include/sys/zfs_znode.h
-+++ b/include/sys/zfs_znode.h
-@@ -270,19 +270,36 @@ typedef struct znode_hold {
- 
- extern unsigned int zfs_object_mutex_size;
- 
--/* Encode ZFS stored time values from a struct timespec */
-+/*
-+ * Encode ZFS stored time values from a struct timespec / struct timespec64.
-+ */
- #define	ZFS_TIME_ENCODE(tp, stmp)		\
--{						\
-+do {						\
- 	(stmp)[0] = (uint64_t)(tp)->tv_sec;	\
- 	(stmp)[1] = (uint64_t)(tp)->tv_nsec;	\
--}
-+} while (0)
- 
--/* Decode ZFS stored time values to a struct timespec */
-+#if defined(HAVE_INODE_TIMESPEC64_TIMES)
-+/*
-+ * Decode ZFS stored time values to a struct timespec64
-+ * 4.18 and newer kernels.
-+ */
- #define	ZFS_TIME_DECODE(tp, stmp)		\
--{						\
--	(tp)->tv_sec = (time_t)(stmp)[0];		\
--	(tp)->tv_nsec = (long)(stmp)[1];		\
--}
-+do {						\
-+	(tp)->tv_sec = (time64_t)(stmp)[0];	\
-+	(tp)->tv_nsec = (long)(stmp)[1];	\
-+} while (0)
-+#else
-+/*
-+ * Decode ZFS stored time values to a struct timespec
-+ * 4.17 and older kernels.
-+ */
-+#define	ZFS_TIME_DECODE(tp, stmp)		\
-+do {						\
-+	(tp)->tv_sec = (time_t)(stmp)[0];	\
-+	(tp)->tv_nsec = (long)(stmp)[1];	\
-+} while (0)
-+#endif /* HAVE_INODE_TIMESPEC64_TIMES */
- 
- /*
-  * Timestamp defines
-diff --git a/include/sys/zpl.h b/include/sys/zpl.h
-index 65ed4313603..e433fbc64ea 100644
---- a/include/sys/zpl.h
-+++ b/include/sys/zpl.h
-@@ -189,4 +189,13 @@ zpl_dir_emit_dots(struct file *file, zpl_dir_context_t *ctx)
- }
- #endif /* HAVE_VFS_ITERATE */
- 
-+/*
-+ * Linux 4.18, inode times converted from timespec to timespec64.
-+ */
-+#if defined(HAVE_INODE_TIMESPEC64_TIMES)
-+#define	zpl_inode_timespec_trunc(ts, gran)	timespec64_trunc(ts, gran)
-+#else
-+#define	zpl_inode_timespec_trunc(ts, gran)	timespec_trunc(ts, gran)
-+#endif
-+
- #endif	/* _SYS_ZPL_H */
-diff --git a/lib/libspl/Makefile.am b/lib/libspl/Makefile.am
-index 59bc8ffb42f..a6e63cb8868 100644
---- a/lib/libspl/Makefile.am
-+++ b/lib/libspl/Makefile.am
-@@ -19,8 +19,6 @@ noinst_LTLIBRARIES = libspl.la
- 
- USER_C = \
- 	getexecname.c \
--	gethrtime.c \
--	gethrestime.c \
- 	getmntany.c \
- 	list.c \
- 	mkdirp.c \
-diff --git a/lib/libspl/gethrestime.c b/lib/libspl/gethrestime.c
-deleted file mode 100644
-index d37cc2d5994..00000000000
---- a/lib/libspl/gethrestime.c
-+++ /dev/null
-@@ -1,38 +0,0 @@
--/*
-- * 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 2008 Sun Microsystems, Inc.  All rights reserved.
-- * Use is subject to license terms.
-- */
--
--#include <time.h>
--#include <sys/time.h>
--
--void
--gethrestime(timestruc_t *ts)
--{
--	struct timeval tv;
--
--	gettimeofday(&tv, NULL);
--	ts->tv_sec = tv.tv_sec;
--	ts->tv_nsec = tv.tv_usec * NSEC_PER_USEC;
--}
-diff --git a/lib/libspl/gethrtime.c b/lib/libspl/gethrtime.c
-deleted file mode 100644
-index 95ceb18e119..00000000000
---- a/lib/libspl/gethrtime.c
-+++ /dev/null
-@@ -1,45 +0,0 @@
--/*
-- * 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 2008 Sun Microsystems, Inc.  All rights reserved.
-- * Use is subject to license terms.
-- */
--
--#include <time.h>
--#include <sys/time.h>
--#include <stdlib.h>
--#include <stdio.h>
--
--hrtime_t
--gethrtime(void)
--{
--	struct timespec ts;
--	int rc;
--
--	rc = clock_gettime(CLOCK_MONOTONIC, &ts);
--	if (rc) {
--		fprintf(stderr, "Error: clock_gettime() = %d\n", rc);
--		abort();
--	}
--
--	return ((((u_int64_t)ts.tv_sec) * NANOSEC) + ts.tv_nsec);
--}
-diff --git a/lib/libspl/include/sys/time.h b/lib/libspl/include/sys/time.h
-index dc645fa5c37..04b3ba87bd3 100644
---- a/lib/libspl/include/sys/time.h
-+++ b/lib/libspl/include/sys/time.h
-@@ -27,8 +27,9 @@
- #ifndef _LIBSPL_SYS_TIME_H
- #define	_LIBSPL_SYS_TIME_H
- 
--#include_next <sys/time.h>
-+#include <time.h>
- #include <sys/types.h>
-+#include_next <sys/time.h>
- 
- #ifndef SEC
- #define	SEC		1
-@@ -70,13 +71,33 @@
- #define	SEC2NSEC(m)	((hrtime_t)(m) * (NANOSEC / SEC))
- #endif
- 
--
- typedef	long long		hrtime_t;
--typedef	struct	timespec	timestruc_t;
--typedef	struct	timespec	timespec_t;
--
--
--extern hrtime_t gethrtime(void);
--extern void gethrestime(timestruc_t *);
-+typedef	struct timespec		timespec_t;
-+typedef struct timespec		inode_timespec_t;
-+
-+static inline void
-+gethrestime(inode_timespec_t *ts)
-+{
-+	struct timeval tv;
-+	(void) gettimeofday(&tv, NULL);
-+	ts->tv_sec = tv.tv_sec;
-+	ts->tv_nsec = tv.tv_usec * NSEC_PER_USEC;
-+}
-+
-+static inline time_t
-+gethrestime_sec(void)
-+{
-+	struct timeval tv;
-+	(void) gettimeofday(&tv, NULL);
-+	return (tv.tv_sec);
-+}
-+
-+static inline hrtime_t
-+gethrtime(void)
-+{
-+	struct timespec ts;
-+	(void) clock_gettime(CLOCK_MONOTONIC, &ts);
-+	return ((((u_int64_t)ts.tv_sec) * NANOSEC) + ts.tv_nsec);
-+}
- 
- #endif /* _LIBSPL_SYS_TIME_H */
-diff --git a/lib/libzpool/kernel.c b/lib/libzpool/kernel.c
-index e67d13c9265..3ea8778b1dc 100644
---- a/lib/libzpool/kernel.c
-+++ b/lib/libzpool/kernel.c
-@@ -498,7 +498,7 @@ cv_timedwait(kcondvar_t *cv, kmutex_t *mp, clock_t abstime)
- {
- 	int error;
- 	struct timeval tv;
--	timestruc_t ts;
-+	struct timespec ts;
- 	clock_t delta;
- 
- 	ASSERT3U(cv->cv_magic, ==, CV_MAGIC);
-@@ -536,7 +536,7 @@ cv_timedwait_hires(kcondvar_t *cv, kmutex_t *mp, hrtime_t tim, hrtime_t res,
- {
- 	int error;
- 	struct timeval tv;
--	timestruc_t ts;
-+	struct timespec ts;
- 	hrtime_t delta;
- 
- 	ASSERT(flag == 0 || flag == CALLOUT_FLAG_ABSOLUTE);
-diff --git a/module/zfs/dmu_objset.c b/module/zfs/dmu_objset.c
-index 3425d542f98..449ebedfa16 100644
---- a/module/zfs/dmu_objset.c
-+++ b/module/zfs/dmu_objset.c
-@@ -860,7 +860,7 @@ dmu_objset_evict_done(objset_t *os)
- 	kmem_free(os, sizeof (objset_t));
- }
- 
--timestruc_t
-+inode_timespec_t
- dmu_objset_snap_cmtime(objset_t *os)
- {
- 	return (dsl_dir_snap_cmtime(os->os_dsl_dataset->ds_dir));
-diff --git a/module/zfs/dsl_dir.c b/module/zfs/dsl_dir.c
-index a3ef5896a3f..deecf6bc53e 100644
---- a/module/zfs/dsl_dir.c
-+++ b/module/zfs/dsl_dir.c
-@@ -1975,10 +1975,10 @@ dsl_dir_transfer_possible(dsl_dir_t *sdd, dsl_dir_t *tdd,
- 	return (0);
- }
- 
--timestruc_t
-+inode_timespec_t
- dsl_dir_snap_cmtime(dsl_dir_t *dd)
- {
--	timestruc_t t;
-+	inode_timespec_t t;
- 
- 	mutex_enter(&dd->dd_lock);
- 	t = dd->dd_snap_cmtime;
-@@ -1990,7 +1990,7 @@ dsl_dir_snap_cmtime(dsl_dir_t *dd)
- void
- dsl_dir_snap_cmtime_update(dsl_dir_t *dd)
- {
--	timestruc_t t;
-+	inode_timespec_t t;
- 
- 	gethrestime(&t);
- 	mutex_enter(&dd->dd_lock);
-diff --git a/module/zfs/fm.c b/module/zfs/fm.c
-index cb148149376..9d26cc99eeb 100644
---- a/module/zfs/fm.c
-+++ b/module/zfs/fm.c
-@@ -508,8 +508,8 @@ zfs_zevent_insert(zevent_t *ev)
- int
- zfs_zevent_post(nvlist_t *nvl, nvlist_t *detector, zevent_cb_t *cb)
- {
-+	inode_timespec_t tv;
- 	int64_t tv_array[2];
--	timestruc_t tv;
- 	uint64_t eid;
- 	size_t nvl_size = 0;
- 	zevent_t *ev;
-diff --git a/module/zfs/zfs_ctldir.c b/module/zfs/zfs_ctldir.c
-index 3b5fb196f1d..3ff2c101b67 100644
---- a/module/zfs/zfs_ctldir.c
-+++ b/module/zfs/zfs_ctldir.c
-@@ -451,7 +451,7 @@ static struct inode *
- zfsctl_inode_alloc(zfsvfs_t *zfsvfs, uint64_t id,
-     const struct file_operations *fops, const struct inode_operations *ops)
- {
--	struct timespec now;
-+	inode_timespec_t now;
- 	struct inode *ip;
- 	znode_t *zp;
- 
-diff --git a/module/zfs/zfs_vnops.c b/module/zfs/zfs_vnops.c
-index 0d2b61a1c31..34ea751c320 100644
---- a/module/zfs/zfs_vnops.c
-+++ b/module/zfs/zfs_vnops.c
-@@ -3158,7 +3158,7 @@ zfs_setattr(struct inode *ip, vattr_t *vap, int flags, cred_t *cr)
- 
- 	if (mask & (ATTR_MTIME | ATTR_SIZE)) {
- 		ZFS_TIME_ENCODE(&vap->va_mtime, mtime);
--		ZTOI(zp)->i_mtime = timespec_trunc(vap->va_mtime,
-+		ZTOI(zp)->i_mtime = zpl_inode_timespec_trunc(vap->va_mtime,
- 		    ZTOI(zp)->i_sb->s_time_gran);
- 
- 		SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL,
-@@ -3167,7 +3167,7 @@ zfs_setattr(struct inode *ip, vattr_t *vap, int flags, cred_t *cr)
- 
- 	if (mask & (ATTR_CTIME | ATTR_SIZE)) {
- 		ZFS_TIME_ENCODE(&vap->va_ctime, ctime);
--		ZTOI(zp)->i_ctime = timespec_trunc(vap->va_ctime,
-+		ZTOI(zp)->i_ctime = zpl_inode_timespec_trunc(vap->va_ctime,
- 		    ZTOI(zp)->i_sb->s_time_gran);
- 		SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
- 		    ctime, sizeof (ctime));
-diff --git a/module/zfs/zfs_znode.c b/module/zfs/zfs_znode.c
-index f508a248f0f..e222c791183 100644
---- a/module/zfs/zfs_znode.c
-+++ b/module/zfs/zfs_znode.c
-@@ -700,7 +700,7 @@ zfs_mknode(znode_t *dzp, vattr_t *vap, dmu_tx_t *tx, cred_t *cr,
- 	uint64_t	rdev = 0;
- 	zfsvfs_t	*zfsvfs = ZTOZSB(dzp);
- 	dmu_buf_t	*db;
--	timestruc_t	now;
-+	inode_timespec_t now;
- 	uint64_t	gen, obj;
- 	int		bonuslen;
- 	int		dnodesize;
-@@ -1349,7 +1349,7 @@ void
- zfs_tstamp_update_setup(znode_t *zp, uint_t flag, uint64_t mtime[2],
-     uint64_t ctime[2])
- {
--	timestruc_t	now;
-+	inode_timespec_t now;
- 
- 	gethrestime(&now);
- 
-diff --git a/module/zfs/zpl_inode.c b/module/zfs/zpl_inode.c
-index 3b5643d0917..41b91cabcb9 100644
---- a/module/zfs/zpl_inode.c
-+++ b/module/zfs/zpl_inode.c
-@@ -384,9 +384,10 @@ zpl_setattr(struct dentry *dentry, struct iattr *ia)
- 	vap->va_mtime = ia->ia_mtime;
- 	vap->va_ctime = ia->ia_ctime;
- 
--	if (vap->va_mask & ATTR_ATIME)
--		ip->i_atime = timespec_trunc(ia->ia_atime,
-+	if (vap->va_mask & ATTR_ATIME) {
-+		ip->i_atime = zpl_inode_timespec_trunc(ia->ia_atime,
- 		    ip->i_sb->s_time_gran);
-+	}
- 
- 	cookie = spl_fstrans_mark();
- 	error = -zfs_setattr(ip, vap, 0, cr);
-From ecaa72315658207608c9e43df870de77af36c1ff Mon Sep 17 00:00:00 2001
-From: Brian Behlendorf <behlendorf1@llnl.gov>
-Date: Fri, 15 Jun 2018 15:05:21 -0700
-Subject: [PATCH] Linux compat 4.18: check_disk_size_change()
-
-Added support for the bops->check_events() interface which was
-added in the 2.6.38 kernel to replace bops->media_changed().
-Fully implementing this functionality allows the volume resize
-code to rely on revalidate_disk(), which is the preferred
-mechanism, and removes the need to use check_disk_size_change().
-
-In order for bops->check_events() to lookup the zvol_state_t
-stored in the disk->private_data the zvol_state_lock needs to
-be held.  Since the check events interface may poll the mutex
-has been converted to a rwlock for better concurrently.  The
-rwlock need only be taken as a writer in the zvol_free() path
-when disk->private_data is set to NULL.
-
-The configure checks for the block_device_operations structure
-were consolidated in a single kernel-block-device-operations.m4
-file.
-
-The ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS configure checks
-and assoicated dead code was removed.  This interface was added
-to the 2.6.28 kernel which predates the oldest supported 2.6.32
-kernel and will therefore always be available.
-
-Updated maximum Linux version in META file.  The 4.17 kernel
-was released on 2018-06-03 and ZoL is compatible with the
-finalized kernel.
-
-Reviewed-by: Boris Protopopov <boris.protopopov@actifio.com>
-Reviewed-by: Sara Hartse <sara.hartse@delphix.com>
-Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
-Closes #7611
-Backported-by: Richard Yao <ryao@gentoo.org>
----
- config/kernel-bdev-block-device-operations.m4 |  34 ---
- ...el-block-device-operations-release-void.m4 |  29 --
- config/kernel-block-device-operations.m4      |  57 ++++
- config/kernel.m4                              |   2 +-
- include/linux/blkdev_compat.h                 |   1 +
- module/zfs/zvol.c                             | 286 ++++++++----------
- 6 files changed, 192 insertions(+), 217 deletions(-)
- delete mode 100644 config/kernel-bdev-block-device-operations.m4
- delete mode 100644 config/kernel-block-device-operations-release-void.m4
- create mode 100644 config/kernel-block-device-operations.m4
-
-diff --git a/config/kernel-bdev-block-device-operations.m4 b/config/kernel-bdev-block-device-operations.m4
-deleted file mode 100644
-index faacc195da9..00000000000
---- a/config/kernel-bdev-block-device-operations.m4
-+++ /dev/null
-@@ -1,34 +0,0 @@
--dnl #
--dnl # 2.6.x API change
--dnl #
--AC_DEFUN([ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS], [
--	AC_MSG_CHECKING([block device operation prototypes])
--	tmp_flags="$EXTRA_KCFLAGS"
--	EXTRA_KCFLAGS="${NO_UNUSED_BUT_SET_VARIABLE}"
--	ZFS_LINUX_TRY_COMPILE([
--		#include <linux/blkdev.h>
--
--		int blk_open(struct block_device *bdev, fmode_t mode)
--		    { return 0; }
--		int blk_ioctl(struct block_device *bdev, fmode_t mode,
--		    unsigned x, unsigned long y) { return 0; }
--		int blk_compat_ioctl(struct block_device * bdev, fmode_t mode,
--		    unsigned x, unsigned long y) { return 0; }
--
--		static const struct block_device_operations
--		    bops __attribute__ ((unused)) = {
--			.open		= blk_open,
--			.release	= NULL,
--			.ioctl		= blk_ioctl,
--			.compat_ioctl	= blk_compat_ioctl,
--		};
--	],[
--	],[
--		AC_MSG_RESULT(struct block_device)
--		AC_DEFINE(HAVE_BDEV_BLOCK_DEVICE_OPERATIONS, 1,
--		          [struct block_device_operations use bdevs])
--	],[
--		AC_MSG_RESULT(struct inode)
--	])
--	EXTRA_KCFLAGS="$tmp_flags"
--])
-diff --git a/config/kernel-block-device-operations-release-void.m4 b/config/kernel-block-device-operations-release-void.m4
-deleted file mode 100644
-index a73f858722a..00000000000
---- a/config/kernel-block-device-operations-release-void.m4
-+++ /dev/null
-@@ -1,29 +0,0 @@
--dnl #
--dnl # 3.10.x API change
--dnl #
--AC_DEFUN([ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID], [
--	AC_MSG_CHECKING([whether block_device_operations.release is void])
--	tmp_flags="$EXTRA_KCFLAGS"
--	EXTRA_KCFLAGS="${NO_UNUSED_BUT_SET_VARIABLE}"
--	ZFS_LINUX_TRY_COMPILE([
--		#include <linux/blkdev.h>
--
--		void blk_release(struct gendisk *g, fmode_t mode) { return; }
--
--		static const struct block_device_operations
--		    bops __attribute__ ((unused)) = {
--			.open		= NULL,
--			.release	= blk_release,
--			.ioctl		= NULL,
--			.compat_ioctl	= NULL,
--		};
--	],[
--	],[
--		AC_MSG_RESULT(void)
--		AC_DEFINE(HAVE_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID, 1,
--		          [struct block_device_operations.release returns void])
--	],[
--		AC_MSG_RESULT(int)
--	])
--	EXTRA_KCFLAGS="$tmp_flags"
--])
-diff --git a/config/kernel-block-device-operations.m4 b/config/kernel-block-device-operations.m4
-new file mode 100644
-index 00000000000..5f2811c1534
---- /dev/null
-+++ b/config/kernel-block-device-operations.m4
-@@ -0,0 +1,57 @@
-+dnl #
-+dnl # 2.6.38 API change
-+dnl #
-+AC_DEFUN([ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS_CHECK_EVENTS], [
-+	AC_MSG_CHECKING([whether bops->check_events() exists])
-+	tmp_flags="$EXTRA_KCFLAGS"
-+	EXTRA_KCFLAGS="${NO_UNUSED_BUT_SET_VARIABLE}"
-+	ZFS_LINUX_TRY_COMPILE([
-+		#include <linux/blkdev.h>
-+
-+		unsigned int blk_check_events(struct gendisk *disk,
-+		    unsigned int clearing) { return (0); }
-+
-+		static const struct block_device_operations
-+		    bops __attribute__ ((unused)) = {
-+			.check_events	= blk_check_events,
-+		};
-+	],[
-+	],[
-+		AC_MSG_RESULT(yes)
-+		AC_DEFINE(HAVE_BLOCK_DEVICE_OPERATIONS_CHECK_EVENTS, 1,
-+		    [bops->check_events() exists])
-+	],[
-+		AC_MSG_RESULT(no)
-+	])
-+	EXTRA_KCFLAGS="$tmp_flags"
-+])
-+
-+dnl #
-+dnl # 3.10.x API change
-+dnl #
-+AC_DEFUN([ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID], [
-+	AC_MSG_CHECKING([whether bops->release() is void])
-+	tmp_flags="$EXTRA_KCFLAGS"
-+	EXTRA_KCFLAGS="${NO_UNUSED_BUT_SET_VARIABLE}"
-+	ZFS_LINUX_TRY_COMPILE([
-+		#include <linux/blkdev.h>
-+
-+		void blk_release(struct gendisk *g, fmode_t mode) { return; }
-+
-+		static const struct block_device_operations
-+		    bops __attribute__ ((unused)) = {
-+			.open		= NULL,
-+			.release	= blk_release,
-+			.ioctl		= NULL,
-+			.compat_ioctl	= NULL,
-+		};
-+	],[
-+	],[
-+		AC_MSG_RESULT(void)
-+		AC_DEFINE(HAVE_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID, 1,
-+		          [bops->release() returns void])
-+	],[
-+		AC_MSG_RESULT(int)
-+	])
-+	EXTRA_KCFLAGS="$tmp_flags"
-+])
-diff --git a/config/kernel.m4 b/config/kernel.m4
-index 375e4b79ae6..c7ca260c5f0 100644
---- a/config/kernel.m4
-+++ b/config/kernel.m4
-@@ -12,7 +12,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
- 	ZFS_AC_KERNEL_CURRENT_BIO_TAIL
- 	ZFS_AC_KERNEL_SUPER_USER_NS
- 	ZFS_AC_KERNEL_SUBMIT_BIO
--	ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS
-+	ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS_CHECK_EVENTS
- 	ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID
- 	ZFS_AC_KERNEL_TYPE_FMODE_T
- 	ZFS_AC_KERNEL_3ARG_BLKDEV_GET
-diff --git a/include/linux/blkdev_compat.h b/include/linux/blkdev_compat.h
-index f99980ab3e0..27f05662662 100644
---- a/include/linux/blkdev_compat.h
-+++ b/include/linux/blkdev_compat.h
-@@ -32,6 +32,7 @@
- #include <linux/blkdev.h>
- #include <linux/elevator.h>
- #include <linux/backing-dev.h>
-+#include <linux/msdos_fs.h>	/* for SECTOR_* */
- 
- #ifndef HAVE_FMODE_T
- typedef unsigned __bitwise__ fmode_t;
-diff --git a/module/zfs/zvol.c b/module/zfs/zvol.c
-index 3e7059b340b..e57d2e70332 100644
---- a/module/zfs/zvol.c
-+++ b/module/zfs/zvol.c
-@@ -99,7 +99,7 @@ unsigned long zvol_max_discard_blocks = 16384;
- unsigned int zvol_volmode = ZFS_VOLMODE_GEOM;
- 
- static taskq_t *zvol_taskq;
--static kmutex_t zvol_state_lock;
-+static krwlock_t zvol_state_lock;
- static list_t zvol_state_list;
- 
- #define	ZVOL_HT_SIZE	1024
-@@ -176,17 +176,17 @@ zvol_find_by_dev(dev_t dev)
- {
- 	zvol_state_t *zv;
- 
--	mutex_enter(&zvol_state_lock);
-+	rw_enter(&zvol_state_lock, RW_READER);
- 	for (zv = list_head(&zvol_state_list); zv != NULL;
- 	    zv = list_next(&zvol_state_list, zv)) {
- 		mutex_enter(&zv->zv_state_lock);
- 		if (zv->zv_dev == dev) {
--			mutex_exit(&zvol_state_lock);
-+			rw_exit(&zvol_state_lock);
- 			return (zv);
- 		}
- 		mutex_exit(&zv->zv_state_lock);
- 	}
--	mutex_exit(&zvol_state_lock);
-+	rw_exit(&zvol_state_lock);
- 
- 	return (NULL);
- }
-@@ -204,7 +204,7 @@ zvol_find_by_name_hash(const char *name, uint64_t hash, int mode)
- 	zvol_state_t *zv;
- 	struct hlist_node *p = NULL;
- 
--	mutex_enter(&zvol_state_lock);
-+	rw_enter(&zvol_state_lock, RW_READER);
- 	hlist_for_each(p, ZVOL_HT_HEAD(hash)) {
- 		zv = hlist_entry(p, zvol_state_t, zv_hlink);
- 		mutex_enter(&zv->zv_state_lock);
-@@ -227,12 +227,12 @@ zvol_find_by_name_hash(const char *name, uint64_t hash, int mode)
- 				    strncmp(zv->zv_name, name, MAXNAMELEN)
- 				    == 0);
- 			}
--			mutex_exit(&zvol_state_lock);
-+			rw_exit(&zvol_state_lock);
- 			return (zv);
- 		}
- 		mutex_exit(&zv->zv_state_lock);
- 	}
--	mutex_exit(&zvol_state_lock);
-+	rw_exit(&zvol_state_lock);
- 
- 	return (NULL);
- }
-@@ -339,24 +339,6 @@ zvol_get_stats(objset_t *os, nvlist_t *nv)
- 	return (SET_ERROR(error));
- }
- 
--static void
--zvol_size_changed(zvol_state_t *zv, uint64_t volsize)
--{
--	struct block_device *bdev;
--
--	ASSERT(MUTEX_HELD(&zv->zv_state_lock));
--
--	bdev = bdget_disk(zv->zv_disk, 0);
--	if (bdev == NULL)
--		return;
--
--	set_capacity(zv->zv_disk, volsize >> 9);
--	zv->zv_volsize = volsize;
--	check_disk_size_change(zv->zv_disk, bdev);
--
--	bdput(bdev);
--}
--
- /*
-  * Sanity check volume size.
-  */
-@@ -409,31 +391,17 @@ zvol_update_volsize(uint64_t volsize, objset_t *os)
- 	return (error);
- }
- 
--static int
--zvol_update_live_volsize(zvol_state_t *zv, uint64_t volsize)
--{
--	zvol_size_changed(zv, volsize);
--
--	/*
--	 * We should post a event here describing the expansion.  However,
--	 * the zfs_ereport_post() interface doesn't nicely support posting
--	 * events for zvols, it assumes events relate to vdevs or zios.
--	 */
--
--	return (0);
--}
--
- /*
-- * Set ZFS_PROP_VOLSIZE set entry point.
-+ * Set ZFS_PROP_VOLSIZE set entry point.  Note that modifying the volume
-+ * size will result in a udev "change" event being generated.
-  */
- int
- zvol_set_volsize(const char *name, uint64_t volsize)
- {
--	zvol_state_t *zv = NULL;
- 	objset_t *os = NULL;
--	int error;
--	dmu_object_info_t *doi;
-+	struct gendisk *disk = NULL;
- 	uint64_t readonly;
-+	int error;
- 	boolean_t owned = B_FALSE;
- 
- 	error = dsl_prop_get_integer(name,
-@@ -443,7 +411,7 @@ zvol_set_volsize(const char *name, uint64_t volsize)
- 	if (readonly)
- 		return (SET_ERROR(EROFS));
- 
--	zv = zvol_find_by_name(name, RW_READER);
-+	zvol_state_t *zv = zvol_find_by_name(name, RW_READER);
- 
- 	ASSERT(zv == NULL || (MUTEX_HELD(&zv->zv_state_lock) &&
- 	    RW_READ_HELD(&zv->zv_suspend_lock)));
-@@ -464,16 +432,18 @@ zvol_set_volsize(const char *name, uint64_t volsize)
- 		os = zv->zv_objset;
- 	}
- 
--	doi = kmem_alloc(sizeof (dmu_object_info_t), KM_SLEEP);
-+	dmu_object_info_t *doi = kmem_alloc(sizeof (*doi), KM_SLEEP);
- 
- 	if ((error = dmu_object_info(os, ZVOL_OBJ, doi)) ||
- 	    (error = zvol_check_volsize(volsize, doi->doi_data_block_size)))
- 		goto out;
- 
- 	error = zvol_update_volsize(volsize, os);
--
--	if (error == 0 && zv != NULL)
--		error = zvol_update_live_volsize(zv, volsize);
-+	if (error == 0 && zv != NULL) {
-+		zv->zv_volsize = volsize;
-+		zv->zv_changed = 1;
-+		disk = zv->zv_disk;
-+	}
- out:
- 	kmem_free(doi, sizeof (dmu_object_info_t));
- 
-@@ -488,6 +458,9 @@ zvol_set_volsize(const char *name, uint64_t volsize)
- 	if (zv != NULL)
- 		mutex_exit(&zv->zv_state_lock);
- 
-+	if (disk != NULL)
-+		revalidate_disk(disk);
-+
- 	return (SET_ERROR(error));
- }
- 
-@@ -543,8 +516,8 @@ zvol_set_volblocksize(const char *name, uint64_t volblocksize)
- 	if (zv == NULL)
- 		return (SET_ERROR(ENXIO));
- 
--	ASSERT(MUTEX_HELD(&zv->zv_state_lock) &&
--	    RW_READ_HELD(&zv->zv_suspend_lock));
-+	ASSERT(MUTEX_HELD(&zv->zv_state_lock));
-+	ASSERT(RW_READ_HELD(&zv->zv_suspend_lock));
- 
- 	if (zv->zv_flags & ZVOL_RDONLY) {
- 		mutex_exit(&zv->zv_state_lock);
-@@ -1120,7 +1093,7 @@ zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio)
- static void
- zvol_insert(zvol_state_t *zv)
- {
--	ASSERT(MUTEX_HELD(&zvol_state_lock));
-+	ASSERT(RW_WRITE_HELD(&zvol_state_lock));
- 	ASSERT3U(MINOR(zv->zv_dev) & ZVOL_MINOR_MASK, ==, 0);
- 	list_insert_head(&zvol_state_list, zv);
- 	hlist_add_head(&zv->zv_hlink, ZVOL_HT_HEAD(zv->zv_hash));
-@@ -1132,7 +1105,7 @@ zvol_insert(zvol_state_t *zv)
- static void
- zvol_remove(zvol_state_t *zv)
- {
--	ASSERT(MUTEX_HELD(&zvol_state_lock));
-+	ASSERT(RW_WRITE_HELD(&zvol_state_lock));
- 	list_remove(&zvol_state_list, zv);
- 	hlist_del(&zv->zv_hlink);
- }
-@@ -1148,8 +1121,8 @@ zvol_setup_zv(zvol_state_t *zv)
- 	uint64_t ro;
- 	objset_t *os = zv->zv_objset;
- 
--	ASSERT(MUTEX_HELD(&zv->zv_state_lock) &&
--	    RW_LOCK_HELD(&zv->zv_suspend_lock));
-+	ASSERT(MUTEX_HELD(&zv->zv_state_lock));
-+	ASSERT(RW_LOCK_HELD(&zv->zv_suspend_lock));
- 
- 	error = dsl_prop_get_integer(zv->zv_name, "readonly", &ro, NULL);
- 	if (error)
-@@ -1227,8 +1200,8 @@ zvol_suspend(const char *name)
- 		return (NULL);
- 
- 	/* block all I/O, release in zvol_resume. */
--	ASSERT(MUTEX_HELD(&zv->zv_state_lock) &&
--	    RW_WRITE_HELD(&zv->zv_suspend_lock));
-+	ASSERT(MUTEX_HELD(&zv->zv_state_lock));
-+	ASSERT(RW_WRITE_HELD(&zv->zv_suspend_lock));
- 
- 	atomic_inc(&zv->zv_suspend_ref);
- 
-@@ -1349,9 +1322,7 @@ zvol_open(struct block_device *bdev, fmode_t flag)
- 	int error = 0;
- 	boolean_t drop_suspend = B_FALSE;
- 
--	ASSERT(!mutex_owned(&zvol_state_lock));
--
--	mutex_enter(&zvol_state_lock);
-+	rw_enter(&zvol_state_lock, RW_READER);
- 	/*
- 	 * Obtain a copy of private_data under the zvol_state_lock to make
- 	 * sure that either the result of zvol free code path setting
-@@ -1360,7 +1331,7 @@ zvol_open(struct block_device *bdev, fmode_t flag)
- 	 */
- 	zv = bdev->bd_disk->private_data;
- 	if (zv == NULL) {
--		mutex_exit(&zvol_state_lock);
-+		rw_exit(&zvol_state_lock);
- 		return (SET_ERROR(-ENXIO));
- 	}
- 
-@@ -1378,8 +1349,7 @@ zvol_open(struct block_device *bdev, fmode_t flag)
- 	} else {
- 		rw_exit(&zv->zv_suspend_lock);
- 	}
--
--	mutex_exit(&zvol_state_lock);
-+	rw_exit(&zvol_state_lock);
- 
- 	if (zv->zv_open_count == 0) {
- 		error = zvol_first_open(zv);
-@@ -1394,11 +1364,18 @@ zvol_open(struct block_device *bdev, fmode_t flag)
- 
- 	zv->zv_open_count++;
- 
-+	mutex_exit(&zv->zv_state_lock);
-+	if (drop_suspend)
-+		rw_exit(&zv->zv_suspend_lock);
-+
- 	check_disk_change(bdev);
- 
-+	return (0);
-+
- out_open_count:
- 	if (zv->zv_open_count == 0)
- 		zvol_last_close(zv);
-+
- out_mutex:
- 	mutex_exit(&zv->zv_state_lock);
- 	if (drop_suspend)
-@@ -1419,26 +1396,34 @@ zvol_release(struct gendisk *disk, fmode_t mode)
- 	zvol_state_t *zv;
- 	boolean_t drop_suspend = B_FALSE;
- 
--	ASSERT(!mutex_owned(&zvol_state_lock));
--
--	mutex_enter(&zvol_state_lock);
-+	rw_enter(&zvol_state_lock, RW_READER);
- 	zv = disk->private_data;
--	ASSERT(zv && zv->zv_open_count > 0);
--
--	/* take zv_suspend_lock before zv_state_lock */
--	rw_enter(&zv->zv_suspend_lock, RW_READER);
- 
- 	mutex_enter(&zv->zv_state_lock);
--	mutex_exit(&zvol_state_lock);
-+	ASSERT(zv && zv->zv_open_count > 0);
- 
- 	/*
- 	 * make sure zvol is not suspended during last close
- 	 * (hold zv_suspend_lock), otherwise, drop the lock
- 	 */
--	if (zv->zv_open_count == 1)
--		drop_suspend = B_TRUE;
--	else
--		rw_exit(&zv->zv_suspend_lock);
-+	if (zv->zv_open_count == 1) {
-+		if (!rw_tryenter(&zv->zv_suspend_lock, RW_READER)) {
-+			mutex_exit(&zv->zv_state_lock);
-+			rw_enter(&zv->zv_suspend_lock, RW_READER);
-+			mutex_enter(&zv->zv_state_lock);
-+			/* check to see if zv_suspend_lock is needed */
-+			if (zv->zv_open_count != 1) {
-+				rw_exit(&zv->zv_suspend_lock);
-+				drop_suspend = B_FALSE;
-+			}
-+		}
-+	} else {
-+		drop_suspend = B_FALSE;
-+	}
-+	rw_exit(&zvol_state_lock);
-+
-+	ASSERT(MUTEX_HELD(&zv->zv_state_lock));
-+	ASSERT(zv->zv_open_count != 1 || RW_READ_HELD(&zv->zv_suspend_lock));
- 
- 	zv->zv_open_count--;
- 	if (zv->zv_open_count == 0)
-@@ -1461,7 +1446,7 @@ zvol_ioctl(struct block_device *bdev, fmode_t mode,
- 	zvol_state_t *zv = bdev->bd_disk->private_data;
- 	int error = 0;
- 
--	ASSERT(zv && zv->zv_open_count > 0);
-+	ASSERT3U(zv->zv_open_count, >, 0);
- 
- 	switch (cmd) {
- 	case BLKFLSBUF:
-@@ -1501,23 +1486,62 @@ zvol_compat_ioctl(struct block_device *bdev, fmode_t mode,
- #define	zvol_compat_ioctl	NULL
- #endif
- 
-+/*
-+ * Linux 2.6.38 preferred interface.
-+ */
-+#ifdef HAVE_BLOCK_DEVICE_OPERATIONS_CHECK_EVENTS
-+static unsigned int
-+zvol_check_events(struct gendisk *disk, unsigned int clearing)
-+{
-+	unsigned int mask = 0;
-+
-+	rw_enter(&zvol_state_lock, RW_READER);
-+
-+	zvol_state_t *zv = disk->private_data;
-+	if (zv != NULL) {
-+		mutex_enter(&zv->zv_state_lock);
-+		mask = zv->zv_changed ? DISK_EVENT_MEDIA_CHANGE : 0;
-+		zv->zv_changed = 0;
-+		mutex_exit(&zv->zv_state_lock);
-+	}
-+
-+	rw_exit(&zvol_state_lock);
-+
-+	return (mask);
-+}
-+#else
- static int zvol_media_changed(struct gendisk *disk)
- {
-+	int changed = 0;
-+
-+	rw_enter(&zvol_state_lock, RW_READER);
-+
- 	zvol_state_t *zv = disk->private_data;
-+	if (zv != NULL) {
-+		mutex_enter(&zv->zv_state_lock);
-+		changed = zv->zv_changed;
-+		zv->zv_changed = 0;
-+		mutex_exit(&zv->zv_state_lock);
-+	}
- 
--	ASSERT(zv && zv->zv_open_count > 0);
-+	rw_exit(&zvol_state_lock);
- 
--	return (zv->zv_changed);
-+	return (changed);
- }
-+#endif
- 
- static int zvol_revalidate_disk(struct gendisk *disk)
- {
--	zvol_state_t *zv = disk->private_data;
-+	rw_enter(&zvol_state_lock, RW_READER);
- 
--	ASSERT(zv && zv->zv_open_count > 0);
-+	zvol_state_t *zv = disk->private_data;
-+	if (zv != NULL) {
-+		mutex_enter(&zv->zv_state_lock);
-+		set_capacity(zv->zv_disk, zv->zv_volsize >> SECTOR_BITS);
-+		mutex_exit(&zv->zv_state_lock);
-+	}
- 
--	zv->zv_changed = 0;
--	set_capacity(zv->zv_disk, zv->zv_volsize >> 9);
-+	rw_exit(&zvol_state_lock);
- 
- 	return (0);
- }
-@@ -1534,7 +1558,7 @@ zvol_getgeo(struct block_device *bdev, struct hd_geometry *geo)
- 	zvol_state_t *zv = bdev->bd_disk->private_data;
- 	sector_t sectors;
- 
--	ASSERT(zv && zv->zv_open_count > 0);
-+	ASSERT3U(zv->zv_open_count, >, 0);
- 
- 	sectors = get_capacity(zv->zv_disk);
- 
-@@ -1567,68 +1591,20 @@ zvol_probe(dev_t dev, int *part, void *arg)
- 	return (kobj);
- }
- 
--#ifdef HAVE_BDEV_BLOCK_DEVICE_OPERATIONS
- static struct block_device_operations zvol_ops = {
- 	.open			= zvol_open,
- 	.release		= zvol_release,
- 	.ioctl			= zvol_ioctl,
- 	.compat_ioctl		= zvol_compat_ioctl,
--	.media_changed		= zvol_media_changed,
--	.revalidate_disk	= zvol_revalidate_disk,
--	.getgeo			= zvol_getgeo,
--	.owner			= THIS_MODULE,
--};
--
--#else /* HAVE_BDEV_BLOCK_DEVICE_OPERATIONS */
--
--static int
--zvol_open_by_inode(struct inode *inode, struct file *file)
--{
--	return (zvol_open(inode->i_bdev, file->f_mode));
--}
--
--static int
--zvol_release_by_inode(struct inode *inode, struct file *file)
--{
--	return (zvol_release(inode->i_bdev->bd_disk, file->f_mode));
--}
--
--static int
--zvol_ioctl_by_inode(struct inode *inode, struct file *file,
--    unsigned int cmd, unsigned long arg)
--{
--	if (file == NULL || inode == NULL)
--		return (SET_ERROR(-EINVAL));
--
--	return (zvol_ioctl(inode->i_bdev, file->f_mode, cmd, arg));
--}
--
--#ifdef CONFIG_COMPAT
--static long
--zvol_compat_ioctl_by_inode(struct file *file,
--    unsigned int cmd, unsigned long arg)
--{
--	if (file == NULL)
--		return (SET_ERROR(-EINVAL));
--
--	return (zvol_compat_ioctl(file->f_dentry->d_inode->i_bdev,
--	    file->f_mode, cmd, arg));
--}
-+#ifdef HAVE_BLOCK_DEVICE_OPERATIONS_CHECK_EVENTS
-+	.check_events		= zvol_check_events,
- #else
--#define	zvol_compat_ioctl_by_inode	NULL
--#endif
--
--static struct block_device_operations zvol_ops = {
--	.open			= zvol_open_by_inode,
--	.release		= zvol_release_by_inode,
--	.ioctl			= zvol_ioctl_by_inode,
--	.compat_ioctl		= zvol_compat_ioctl_by_inode,
- 	.media_changed		= zvol_media_changed,
-+#endif
- 	.revalidate_disk	= zvol_revalidate_disk,
- 	.getgeo			= zvol_getgeo,
- 	.owner			= THIS_MODULE,
- };
--#endif /* HAVE_BDEV_BLOCK_DEVICE_OPERATIONS */
- 
- /*
-  * Allocate memory for a new zvol_state_t and setup the required
-@@ -1681,6 +1657,10 @@ zvol_alloc(dev_t dev, const char *name)
- 	rw_init(&zv->zv_suspend_lock, NULL, RW_DEFAULT, NULL);
- 
- 	zv->zv_disk->major = zvol_major;
-+#ifdef HAVE_BLOCK_DEVICE_OPERATIONS_CHECK_EVENTS
-+	zv->zv_disk->events = DISK_EVENT_MEDIA_CHANGE;
-+#endif
-+
- 	if (volmode == ZFS_VOLMODE_DEV) {
- 		/*
- 		 * ZFS_VOLMODE_DEV disable partitioning on ZVOL devices: set
-@@ -1725,7 +1705,6 @@ zvol_free(void *arg)
- {
- 	zvol_state_t *zv = arg;
- 
--	ASSERT(!MUTEX_HELD(&zvol_state_lock));
- 	ASSERT(!RW_LOCK_HELD(&zv->zv_suspend_lock));
- 	ASSERT(!MUTEX_HELD(&zv->zv_state_lock));
- 	ASSERT(zv->zv_open_count == 0);
-@@ -1852,9 +1831,9 @@ zvol_create_minor_impl(const char *name)
- 	kmem_free(doi, sizeof (dmu_object_info_t));
- 
- 	if (error == 0) {
--		mutex_enter(&zvol_state_lock);
-+		rw_enter(&zvol_state_lock, RW_WRITER);
- 		zvol_insert(zv);
--		mutex_exit(&zvol_state_lock);
-+		rw_exit(&zvol_state_lock);
- 		add_disk(zv->zv_disk);
- 	} else {
- 		ida_simple_remove(&zvol_ida, idx);
-@@ -1871,7 +1850,7 @@ zvol_rename_minor(zvol_state_t *zv, const char *newname)
- {
- 	int readonly = get_disk_ro(zv->zv_disk);
- 
--	ASSERT(MUTEX_HELD(&zvol_state_lock));
-+	ASSERT(RW_LOCK_HELD(&zvol_state_lock));
- 	ASSERT(MUTEX_HELD(&zv->zv_state_lock));
- 
- 	strlcpy(zv->zv_name, newname, sizeof (zv->zv_name));
-@@ -2111,7 +2090,7 @@ zvol_remove_minors_impl(const char *name)
- 	list_create(&free_list, sizeof (zvol_state_t),
- 	    offsetof(zvol_state_t, zv_next));
- 
--	mutex_enter(&zvol_state_lock);
-+	rw_enter(&zvol_state_lock, RW_WRITER);
- 
- 	for (zv = list_head(&zvol_state_list); zv != NULL; zv = zv_next) {
- 		zv_next = list_next(&zvol_state_list, zv);
-@@ -2136,15 +2115,15 @@ zvol_remove_minors_impl(const char *name)
- 			zvol_remove(zv);
- 
- 			/*
--			 * clear this while holding zvol_state_lock so
--			 * zvol_open won't open it
-+			 * Cleared while holding zvol_state_lock as a writer
-+			 * which will prevent zvol_open() from opening it.
- 			 */
- 			zv->zv_disk->private_data = NULL;
- 
- 			/* Drop zv_state_lock before zvol_free() */
- 			mutex_exit(&zv->zv_state_lock);
- 
--			/* try parallel zv_free, if failed do it in place */
-+			/* Try parallel zv_free, if failed do it in place */
- 			t = taskq_dispatch(system_taskq, zvol_free, zv,
- 			    TQ_SLEEP);
- 			if (t == TASKQID_INVALID)
-@@ -2155,11 +2134,9 @@ zvol_remove_minors_impl(const char *name)
- 			mutex_exit(&zv->zv_state_lock);
- 		}
- 	}
--	mutex_exit(&zvol_state_lock);
-+	rw_exit(&zvol_state_lock);
- 
--	/*
--	 * Drop zvol_state_lock before calling zvol_free()
--	 */
-+	/* Drop zvol_state_lock before calling zvol_free() */
- 	while ((zv = list_head(&free_list)) != NULL) {
- 		list_remove(&free_list, zv);
- 		zvol_free(zv);
-@@ -2178,7 +2155,7 @@ zvol_remove_minor_impl(const char *name)
- 	if (zvol_inhibit_dev)
- 		return;
- 
--	mutex_enter(&zvol_state_lock);
-+	rw_enter(&zvol_state_lock, RW_WRITER);
- 
- 	for (zv = list_head(&zvol_state_list); zv != NULL; zv = zv_next) {
- 		zv_next = list_next(&zvol_state_list, zv);
-@@ -2198,7 +2175,10 @@ zvol_remove_minor_impl(const char *name)
- 			}
- 			zvol_remove(zv);
- 
--			/* clear this so zvol_open won't open it */
-+			/*
-+			 * Cleared while holding zvol_state_lock as a writer
-+			 * which will prevent zvol_open() from opening it.
-+			 */
- 			zv->zv_disk->private_data = NULL;
- 
- 			mutex_exit(&zv->zv_state_lock);
-@@ -2209,7 +2189,7 @@ zvol_remove_minor_impl(const char *name)
- 	}
- 
- 	/* Drop zvol_state_lock before calling zvol_free() */
--	mutex_exit(&zvol_state_lock);
-+	rw_exit(&zvol_state_lock);
- 
- 	if (zv != NULL)
- 		zvol_free(zv);
-@@ -2230,7 +2210,7 @@ zvol_rename_minors_impl(const char *oldname, const char *newname)
- 	oldnamelen = strlen(oldname);
- 	newnamelen = strlen(newname);
- 
--	mutex_enter(&zvol_state_lock);
-+	rw_enter(&zvol_state_lock, RW_READER);
- 
- 	for (zv = list_head(&zvol_state_list); zv != NULL; zv = zv_next) {
- 		zv_next = list_next(&zvol_state_list, zv);
-@@ -2258,7 +2238,7 @@ zvol_rename_minors_impl(const char *oldname, const char *newname)
- 		mutex_exit(&zv->zv_state_lock);
- 	}
- 
--	mutex_exit(&zvol_state_lock);
-+	rw_exit(&zvol_state_lock);
- }
- 
- typedef struct zvol_snapdev_cb_arg {
-@@ -2635,7 +2615,7 @@ zvol_init(void)
- 
- 	list_create(&zvol_state_list, sizeof (zvol_state_t),
- 	    offsetof(zvol_state_t, zv_next));
--	mutex_init(&zvol_state_lock, NULL, MUTEX_DEFAULT, NULL);
-+	rw_init(&zvol_state_lock, NULL, RW_DEFAULT, NULL);
- 	ida_init(&zvol_ida);
- 
- 	zvol_taskq = taskq_create(ZVOL_DRIVER, threads, maxclsyspri,
-@@ -2672,7 +2652,7 @@ zvol_init(void)
- 	taskq_destroy(zvol_taskq);
- out:
- 	ida_destroy(&zvol_ida);
--	mutex_destroy(&zvol_state_lock);
-+	rw_destroy(&zvol_state_lock);
- 	list_destroy(&zvol_state_list);
- 
- 	return (SET_ERROR(error));
-@@ -2689,7 +2669,7 @@ zvol_fini(void)
- 
- 	taskq_destroy(zvol_taskq);
- 	list_destroy(&zvol_state_list);
--	mutex_destroy(&zvol_state_lock);
-+	rw_destroy(&zvol_state_lock);
- 
- 	ida_destroy(&zvol_ida);
- }
diff --git a/sys-fs/zfs-utils/zfs-utils-0.7.9-r1.ebuild b/sys-fs/zfs-utils/zfs-utils-0.7.9-r2.ebuild
index da274b21..527ced05 100644
--- a/sys-fs/zfs-utils/zfs-utils-0.7.9-r1.ebuild
+++ b/sys-fs/zfs-utils/zfs-utils-0.7.9-r2.ebuild
@@ -76,7 +76,6 @@ pkg_setup() {
 }
 
 src_prepare() {
-	epatch "${FILESDIR}/kernel-4.18.patch"
 	# Update paths
 	sed -e "s|/sbin/lsmod|/bin/lsmod|" \
 		-e "s|/usr/bin/scsi-rescan|/usr/sbin/rescan-scsi-bus|" \