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	Index: sys/fs/tmpfs/tmpfs_subr.c
	===================================================================
	--- sys/fs/tmpfs/tmpfs_subr.c
	+++ sys/fs/tmpfs/tmpfs_subr.c
	@@ -190,8 +190,6 @@
	/* If the root directory of the 'tmp' file system is not yet
	* allocated, this must be the request to do it. */
	MPASS(IMPLIES(tmp->tm_root == NULL, parent == NULL && type == VDIR));
	- KASSERT(tmp->tm_root == NULL \|\| mp->mnt_writeopcount > 0,
	- ("creating node not under vn_start_write"));

	MPASS(IFF(type == VLNK, target != NULL));
	MPASS(IFF(type == VBLK \|\| type == VCHR, rdev != VNOVAL));
	Index: sys/kern/vfs_mount.c
	===================================================================
	--- sys/kern/vfs_mount.c
	+++ sys/kern/vfs_mount.c
	@@ -126,6 +126,12 @@
	lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0);
	mp->mnt_thread_in_ops_pcpu = uma_zalloc_pcpu(pcpu_zone_int,
	M_WAITOK \| M_ZERO);
	+ mp->mnt_ref_pcpu = uma_zalloc_pcpu(pcpu_zone_int,
	+ M_WAITOK \| M_ZERO);
	+ mp->mnt_lockref_pcpu = uma_zalloc_pcpu(pcpu_zone_int,
	+ M_WAITOK \| M_ZERO);
	+ mp->mnt_writeopcount_pcpu = uma_zalloc_pcpu(pcpu_zone_int,
	+ M_WAITOK \| M_ZERO);
	mp->mnt_ref = 0;
	mp->mnt_vfs_ops = 1;
	return (0);
	@@ -137,6 +143,9 @@
	struct mount *mp;

	mp = (struct mount *)mem;
	+ uma_zfree_pcpu(pcpu_zone_int, mp->mnt_writeopcount_pcpu);
	+ uma_zfree_pcpu(pcpu_zone_int, mp->mnt_lockref_pcpu);
	+ uma_zfree_pcpu(pcpu_zone_int, mp->mnt_ref_pcpu);
	uma_zfree_pcpu(pcpu_zone_int, mp->mnt_thread_in_ops_pcpu);
	lockdestroy(&mp->mnt_explock);
	mtx_destroy(&mp->mnt_listmtx);
	@@ -533,6 +542,8 @@
	if (mp->mnt_vfs_ops == 0)
	panic("%s: entered with zero vfs_ops\n", __func__);

	+ vfs_assert_mount_counters(mp);
	+
	MNT_ILOCK(mp);
	mp->mnt_kern_flag \|= MNTK_REFEXPIRE;
	if (mp->mnt_kern_flag & MNTK_MWAIT) {
	@@ -1382,6 +1393,7 @@
	void
	vfs_op_enter(struct mount *mp)
	{
	+ int cpu;

	MNT_ILOCK(mp);
	mp->mnt_vfs_ops++;
	@@ -1391,7 +1403,17 @@
	}
	atomic_thread_fence_seq_cst();
	vfs_op_barrier_wait(mp);
	+ atomic_thread_fence_acq();
	+ CPU_FOREACH(cpu) {
	+ mp->mnt_ref +=
	+ zpcpu_replace_cpu(mp->mnt_ref_pcpu, 0, cpu);
	+ mp->mnt_lockref +=
	+ zpcpu_replace_cpu(mp->mnt_lockref_pcpu, 0, cpu);
	+ mp->mnt_writeopcount +=
	+ zpcpu_replace_cpu(mp->mnt_writeopcount_pcpu, 0, cpu);
	+ }
	MNT_IUNLOCK(mp);
	+ vfs_assert_mount_counters(mp);
	}

	void
	@@ -1403,6 +1425,7 @@
	if (mp->mnt_vfs_ops <= 0)
	panic("%s: invalid vfs_ops count %d for mp %p\n",
	__func__, mp->mnt_vfs_ops, mp);
	+ vfs_assert_mount_counters(mp);
	mp->mnt_vfs_ops--;
	}

	@@ -1431,6 +1454,93 @@
	}
	}

	+#ifdef INVARIANTS
	+void
	+vfs_assert_mount_counters(struct mount *mp)
	+{
	+ int cpu;
	+
	+ if (mp->mnt_vfs_ops == 0)
	+ return;
	+
	+ for (cpu = 0; cpu <= mp_maxid; cpu++) {
	+ if ((int )zpcpu_get_cpu(mp->mnt_ref_pcpu, cpu) != 0 \|\|
	+ (int )zpcpu_get_cpu(mp->mnt_lockref_pcpu, cpu) != 0 \|\|
	+ (int )zpcpu_get_cpu(mp->mnt_writeopcount_pcpu, cpu) != 0)
	+ vfs_dump_mount_counters(mp);
	+ }
	+}
	+
	+void
	+vfs_dump_mount_counters(struct mount *mp)
	+{
	+ int cpu, *count;
	+ int ref, lockref, writeopcount;
	+
	+ printf("%s: mp %p vfs_ops %d\n", __func__, mp, mp->mnt_vfs_ops);
	+
	+ printf(" ref : ");
	+ ref = mp->mnt_ref;
	+ for (cpu = 0; cpu <= mp_maxid; cpu++) {
	+ count = zpcpu_get_cpu(mp->mnt_ref_pcpu, cpu);
	+ printf("%d ", *count);
	+ ref += *count;
	+ }
	+ printf("\n");
	+ printf(" lockref : ");
	+ lockref = mp->mnt_lockref;
	+ for (cpu = 0; cpu <= mp_maxid; cpu++) {
	+ count = zpcpu_get_cpu(mp->mnt_lockref_pcpu, cpu);
	+ printf("%d ", *count);
	+ lockref += *count;
	+ }
	+ printf("\n");
	+ printf("writeopcount: ");
	+ writeopcount = mp->mnt_writeopcount;
	+ for (cpu = 0; cpu <= mp_maxid; cpu++) {
	+ count = zpcpu_get_cpu(mp->mnt_writeopcount_pcpu, cpu);
	+ printf("%d ", *count);
	+ writeopcount += *count;
	+ }
	+ printf("\n");
	+
	+ printf("counter struct total\n");
	+ printf("ref %-5d %-5d\n", mp->mnt_ref, ref);
	+ printf("lockref %-5d %-5d\n", mp->mnt_lockref, lockref);
	+ printf("writeopcount %-5d %-5d\n", mp->mnt_writeopcount, writeopcount);
	+
	+ panic("invalid counts on struct mount");
	+}
	+#endif
	+
	+int
	+vfs_mount_fetch_counter(struct mount *mp, enum mount_counter which)
	+{
	+ int cpu, sum;
	+ int base, pcpu;
	+
	+ switch (which) {
	+ case MNT_COUNT_REF:
	+ base = &mp->mnt_ref;
	+ pcpu = mp->mnt_ref_pcpu;
	+ break;
	+ case MNT_COUNT_LOCKREF:
	+ base = &mp->mnt_lockref;
	+ pcpu = mp->mnt_lockref_pcpu;
	+ break;
	+ case MNT_COUNT_WRITEOPCOUNT:
	+ base = &mp->mnt_writeopcount;
	+ pcpu = mp->mnt_writeopcount_pcpu;
	+ break;
	+ }
	+
	+ sum = *base;
	+ for (cpu = 0; cpu <= mp_maxid; cpu++) {
	+ sum += (int )zpcpu_get_cpu(pcpu, cpu);
	+ }
	+ return (sum);
	+}
	+
	/*
	* Do the actual filesystem unmount.
	*/
	Index: sys/kern/vfs_subr.c
	===================================================================
	--- sys/kern/vfs_subr.c
	+++ sys/kern/vfs_subr.c
	@@ -646,7 +646,7 @@
	MPASS((mp->mnt_kern_flag & MNTK_UNMOUNT) == 0);
	MPASS((mp->mnt_kern_flag & MNTK_REFEXPIRE) == 0);
	MNT_REF_FASTPATH(mp);
	- atomic_add_int(&mp->mnt_lockref, 1);
	+ ((int )zpcpu_get(mp->mnt_lockref_pcpu))++;
	if (flags & MBF_MNTLSTLOCK)
	mtx_unlock(&mountlist_mtx);
	vfs_op_thread_exit(mp);
	@@ -654,6 +654,7 @@
	}

	MNT_ILOCK(mp);
	+ vfs_assert_mount_counters(mp);
	MNT_REF(mp);
	/*
	* If mount point is currently being unmounted, sleep until the
	@@ -685,7 +686,7 @@
	}
	if (flags & MBF_MNTLSTLOCK)
	mtx_unlock(&mountlist_mtx);
	- atomic_add_int(&mp->mnt_lockref, 1);
	+ mp->mnt_lockref++;
	MNT_IUNLOCK(mp);
	return (0);
	}
	@@ -702,17 +703,23 @@

	if (vfs_op_thread_enter(mp)) {
	MPASS((mp->mnt_kern_flag & MNTK_DRAINING) == 0);
	- c = atomic_fetchadd_int(&mp->mnt_lockref, -1) - 1;
	- KASSERT(c >= 0, ("%s: negative mnt_lockref %d\n", __func__, c));
	+ ((int )zpcpu_get(mp->mnt_lockref_pcpu))--;
	MNT_REL_FASTPATH(mp);
	vfs_op_thread_exit(mp);
	return;
	}

	MNT_ILOCK(mp);
	+ vfs_assert_mount_counters(mp);
	MNT_REL(mp);
	- c = atomic_fetchadd_int(&mp->mnt_lockref, -1) - 1;
	- KASSERT(c >= 0, ("%s: negative mnt_lockref %d\n", __func__, c));
	+ c = --mp->mnt_lockref;
	+ if (mp->mnt_vfs_ops == 0) {
	+ MPASS((mp->mnt_kern_flag & MNTK_DRAINING) == 0);
	+ MNT_IUNLOCK(mp);
	+ return;
	+ }
	+ if (c < 0)
	+ vfs_dump_mount_counters(mp);
	if (c == 0 && (mp->mnt_kern_flag & MNTK_DRAINING) != 0) {
	MPASS(mp->mnt_kern_flag & MNTK_UNMOUNT);
	CTR1(KTR_VFS, "%s: waking up waiters", __func__);
	@@ -4040,16 +4047,19 @@
	if (jailed(mp->mnt_cred))
	db_printf(", jail=%d", mp->mnt_cred->cr_prison->pr_id);
	db_printf(" }\n");
	- db_printf(" mnt_ref = %d\n", mp->mnt_ref);
	+ db_printf(" mnt_ref = %d (with %d in the struct)\n",
	+ vfs_mount_fetch_counter(mp, MNT_COUNT_REF), mp->mnt_ref);
	db_printf(" mnt_gen = %d\n", mp->mnt_gen);
	db_printf(" mnt_nvnodelistsize = %d\n", mp->mnt_nvnodelistsize);
	db_printf(" mnt_activevnodelistsize = %d\n",
	mp->mnt_activevnodelistsize);
	- db_printf(" mnt_writeopcount = %d\n", mp->mnt_writeopcount);
	+ db_printf(" mnt_writeopcount = %d (with %d in the struct)\n",
	+ vfs_mount_fetch_counter(mp, MNT_COUNT_WRITEOPCOUNT), mp->mnt_writeopcount);
	db_printf(" mnt_maxsymlinklen = %d\n", mp->mnt_maxsymlinklen);
	db_printf(" mnt_iosize_max = %d\n", mp->mnt_iosize_max);
	db_printf(" mnt_hashseed = %u\n", mp->mnt_hashseed);
	- db_printf(" mnt_lockref = %d\n", mp->mnt_lockref);
	+ db_printf(" mnt_lockref = %d (with %d in the struct)\n",
	+ vfs_mount_fetch_counter(mp, MNT_COUNT_LOCKREF), mp->mnt_lockref);
	db_printf(" mnt_secondary_writes = %d\n", mp->mnt_secondary_writes);
	db_printf(" mnt_secondary_accwrites = %d\n",
	mp->mnt_secondary_accwrites);
	Index: sys/kern/vfs_vnops.c
	===================================================================
	--- sys/kern/vfs_vnops.c
	+++ sys/kern/vfs_vnops.c
	@@ -1637,7 +1637,7 @@

	if (vfs_op_thread_enter(mp)) {
	MPASS((mp->mnt_kern_flag & MNTK_SUSPEND) == 0);
	- atomic_add_int(&mp->mnt_writeopcount, 1);
	+ ((int )zpcpu_get(mp->mnt_writeopcount_pcpu))++;
	vfs_op_thread_exit(mp);
	return (0);
	}
	@@ -1667,7 +1667,7 @@
	}
	if (flags & V_XSLEEP)
	goto unlock;
	- atomic_add_int(&mp->mnt_writeopcount, 1);
	+ mp->mnt_writeopcount++;
	unlock:
	if (error != 0 \|\| (flags & V_XSLEEP) != 0)
	MNT_REL(mp);
	@@ -1804,19 +1804,25 @@
	return;

	if (vfs_op_thread_enter(mp)) {
	- c = atomic_fetchadd_int(&mp->mnt_writeopcount, -1) - 1;
	- if (c < 0)
	- panic("vn_finished_write: invalid writeopcount %d", c);
	+ ((int )zpcpu_get(mp->mnt_writeopcount_pcpu))--;
	MNT_REL_FASTPATH(mp);
	vfs_op_thread_exit(mp);
	return;
	}

	MNT_ILOCK(mp);
	+ vfs_assert_mount_counters(mp);
	MNT_REL(mp);
	- c = atomic_fetchadd_int(&mp->mnt_writeopcount, -1) - 1;
	- if (c < 0)
	- panic("vn_finished_write: invalid writeopcount %d", c);
	+ c = --mp->mnt_writeopcount;
	+ if (mp->mnt_vfs_ops == 0) {
	+ MPASS((mp->mnt_kern_flag & MNTK_SUSPEND) == 0);
	+ MNT_IUNLOCK(mp);
	+ return;
	+ }
	+ if (c < 0) {
	+ printf("vn_finished_write: invalid writeopcount %d", c);
	+ vfs_dump_mount_counters(mp);
	+ }
	if ((mp->mnt_kern_flag & MNTK_SUSPEND) != 0 && c == 0)
	wakeup(&mp->mnt_writeopcount);
	MNT_IUNLOCK(mp);
	@@ -1859,6 +1865,7 @@
	vfs_op_enter(mp);

	MNT_ILOCK(mp);
	+ vfs_assert_mount_counters(mp);
	if (mp->mnt_susp_owner == curthread) {
	vfs_op_exit_locked(mp);
	MNT_IUNLOCK(mp);
	@@ -1916,7 +1923,7 @@
	curthread->td_pflags &= ~TDP_IGNSUSP;
	if ((flags & VR_START_WRITE) != 0) {
	MNT_REF(mp);
	- atomic_add_int(&mp->mnt_writeopcount, 1);
	+ mp->mnt_writeopcount++;
	}
	MNT_IUNLOCK(mp);
	if ((flags & VR_NO_SUSPCLR) == 0)
	Index: sys/sys/mount.h
	===================================================================
	--- sys/sys/mount.h
	+++ sys/sys/mount.h
	@@ -228,6 +228,9 @@
	TAILQ_HEAD(, mount) mnt_uppers; /* (m) upper mounts over us*/
	int mnt_vfs_ops; /* (i) pending vfs ops */
	int *mnt_thread_in_ops_pcpu;
	+ int *mnt_ref_pcpu;
	+ int *mnt_lockref_pcpu;
	+ int *mnt_writeopcount_pcpu;
	};

	/*
	@@ -269,24 +272,22 @@
	#define MNT_MTX(mp) (&(mp)->mnt_mtx)

	#define MNT_REF_FASTPATH(mp) do { \
	- atomic_add_int(&(mp)->mnt_ref, 1); \
	+ ((int )zpcpu_get(mp->mnt_ref_pcpu))++; \
	} while (0)
	#define MNT_REL_FASTPATH(mp) do { \
	- int _c; \
	- _c = atomic_fetchadd_int(&(mp)->mnt_ref, -1) - 1; \
	- KASSERT(_c >= 0, ("negative mnt_ref %d", _c)); \
	+ ((int )zpcpu_get(mp->mnt_ref_pcpu))--; \
	} while (0)

	#define MNT_REF(mp) do { \
	mtx_assert(MNT_MTX(mp), MA_OWNED); \
	- atomic_add_int(&(mp)->mnt_ref, 1); \
	+ mp->mnt_ref++; \
	} while (0)
	#define MNT_REL(mp) do { \
	- int _c; \
	mtx_assert(MNT_MTX(mp), MA_OWNED); \
	- _c = atomic_fetchadd_int(&(mp)->mnt_ref, -1) - 1; \
	- KASSERT(_c >= 0, ("negative mnt_ref %d", _c)); \
	- if (_c == 0) \
	+ (mp)->mnt_ref--; \
	+ if ((mp)->mnt_vfs_ops && (mp)->mnt_ref < 0) \
	+ vfs_dump_mount_counters(mp); \
	+ if ((mp)->mnt_ref == 0 && (mp)->mnt_vfs_ops) \
	wakeup((mp)); \
	} while (0)

	@@ -959,6 +960,17 @@
	void vfs_op_exit_locked(struct mount *);
	void vfs_op_exit(struct mount *);

	+#ifdef INVARIANTS
	+void vfs_assert_mount_counters(struct mount *);
	+void vfs_dump_mount_counters(struct mount *);
	+#else
	+#define vfs_assert_mount_counters(mp) do { } while (0)
	+#define vfs_dump_mount_counters(mp) do { } while (0)
	+#endif
	+
	+enum mount_counter { MNT_COUNT_REF, MNT_COUNT_LOCKREF, MNT_COUNT_WRITEOPCOUNT };
	+int vfs_mount_fetch_counter(struct mount *, enum mount_counter);
	+
	/*
	* We mark ourselves as entering the section and post a full barrier, meaning
	* the store is completed before we get into the section and mnt_vfs_ops is
	Index: sys/sys/pcpu.h
	===================================================================
	--- sys/sys/pcpu.h
	+++ sys/sys/pcpu.h
	@@ -242,6 +242,18 @@
	return ((char )(base) + UMA_PCPU_ALLOC_SIZE cpu);
	}

	+/*
	+ * This operation is NOT atomic and does not post any barriers.
	+ * If you use this the assumption is that the target CPU will not
	+ * be modifying this variable.
	+ * If you need atomicity use xchg.
	+ * */
	+#define zpcpu_replace_cpu(base, val, cpu) ({ \
	+ __typeof(val) _old = (__typeof(val) )zpcpu_get_cpu(base, cpu);\
	+ (__typeof(val) )zpcpu_get_cpu(base, cpu) = val; \
	+ _old; \
	+})
	+
	/*
	* Machine dependent callouts. cpu_pcpu_init() is responsible for
	* initializing machine dependent fields of struct pcpu, and
	Index: sys/ufs/ffs/ffs_softdep.c
	===================================================================
	--- sys/ufs/ffs/ffs_softdep.c
	+++ sys/ufs/ffs/ffs_softdep.c
	@@ -13403,10 +13403,11 @@
	* (fs_minfree).
	*/
	if (resource == FLUSH_INODES_WAIT) {
	- needed = vp->v_mount->mnt_writeopcount + 2;
	+ needed = vfs_mount_fetch_counter(vp->v_mount,
	+ MNT_COUNT_WRITEOPCOUNT) + 2;
	} else if (resource == FLUSH_BLOCKS_WAIT) {
	- needed = (vp->v_mount->mnt_writeopcount + 2) *
	- fs->fs_contigsumsize;
	+ needed = (vfs_mount_fetch_counter(vp->v_mount,
	+ MNT_COUNT_WRITEOPCOUNT) + 2) * fs->fs_contigsumsize;
	if (priv_check_cred(cred, PRIV_VFS_BLOCKRESERVE))
	needed += fragstoblks(fs,
	roundup((fs->fs_dsize * fs->fs_minfree / 100) -

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