mirror of
https://github.com/freebsd/freebsd-src
synced 2024-07-22 02:37:15 +00:00
4d846d260e
The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch up to that fact and revert to their recommended match of BSD-2-Clause. Discussed with: pfg MFC After: 3 days Sponsored by: Netflix
86 lines
2.7 KiB
Groff
86 lines
2.7 KiB
Groff
.\"
|
|
.\" 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 .
|