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+.\"
+.\" SPDX-License-Identifier: BSD-2-Clause
+.\"
+.\" Copyright (c) 2021 The FreeBSD Foundation
+.\"
+.\" This manual page was written by Ka Ho Ng under sponsorship from
+.\" the FreeBSD Foundation.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd April 24, 2022
+.Dt VNODE_PAGER_PURGE_RANGE 9
+.Os
+.Sh NAME
+.Nm vnode_pager_purge_range
+.Nd "invalidate the cached content within the given byte range"
+.Sh SYNOPSIS
+.In sys/param.h
+.In vm/vm.h
+.In vm/vm_extern.h
+.Ft void
+.Fo vnode_pager_purge_range
+.Fa "struct vnode *vp"
+.Fa "vm_ooffset_t start"
+.Fa "vm_ooffset_t end"
+.Fc
+.Sh DESCRIPTION
+.Nm
+invalidates the cached content within the given byte range from the
+specified vnode
+.Fa vp .
+The range to be purged is
+.Eo [
+.Fa start , end
+.Ec ) .
+If the
+.Fa end
+parameter is the value zero, the affected range starts from
+.Fa start
+continues to the end of the object.
+Pages within the specified range will be removed from the object's queue.
+If
+.Fa start
+or
+.Fa end
+is not aligned to a page boundary, the invalidated part of the page is zeroed.
+This function only cleans the resident pages in the affected region, it is up to
+the callers to ensure reading the backing store gets back zeroes.
+.Pp
+In case the vnode
+.Fa vp
+does not have a VM object allocated, the effect of calling this function is a
+no-op.
+.Sh LOCKS
+The vnode must be locked on entry and will still be locked on exit.
+.Sh SEE ALSO
+.Xr vnode 9
+.Sh HISTORY
+The
+.Nm
+manual page first appeared in
+.Fx 14 .
+.Sh AUTHORS
+This
+manual page was written by
+.An Ka Ho Ng Aq Mt khng@FreeBSD.org .