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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 August 25, 2021
+.Dt VN_DEALLOCATE 9
+.Os
+.Sh NAME
+.Nm vn_deallocate
+.Nd zero and/or deallocate storage from a file
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/vnode.h
+.Ft int
+.Fo vn_deallocate
+.Fa "struct vnode *vp"
+.Fa "off_t *offset"
+.Fa "off_t *length"
+.Fa "int flags"
+.Fa "int ioflag"
+.Fa "struct ucred *active_cred"
+.Fa "struct ucred *file_cred"
+.Fc
+.Sh DESCRIPTION
+The
+.Fn vn_deallocate
+function zeros and/or deallocates backing storage space from a file.
+This function only works on vnodes with
+.Dv VREG
+type.
+.Pp
+The arguments are:
+.Bl -tag -width active_cred
+.It Fa vp
+The vnode of the file.
+.It Fa offset
+The starting offset of the operation range.
+.It Fa length
+The length of the operation range.
+This must be greater than 0.
+.It Fa flags
+The control flags of the operation.
+This should be set to 0 for now.
+.It Fa ioflag
+Directives and hints to be given to the file system.
+.It Fa active_cred
+The user credentials of the calling thread.
+.It Fa file_cred
+The credentials installed on the file description pointing to the vnode or NOCRED.
+.El
+.Pp
+The
+.Fn ioflag
+argument gives directives and hints to the file system.
+It may include one or more of the following flags:
+.Bl -tag -width IO_RANGELOCKED
+.It Dv IO_NODELOCKED
+The vnode was locked before the call.
+.It Dv IO_RANGELOCKED
+Rangelock was owned around the call.
+.It Dv IO_NOMACCHECK
+Skip MAC checking in the call.
+.It Dv IO_SYNC
+Do I/O synchronously.
+.It Dv IO_DIRECT
+Attempt to bypass buffer cache.
+.El
+.Pp
+.Fa *offset
+and
+.Fa *length
+are updated to reflect the unprocessed operation range of the call.
+For a successful completion,
+.Fa *length
+is updated to be the value 0, and
+.Fa *offset
+is incremented by the number of bytes zeroed before the end-of-file.
+.Sh RETURN VALUES
+Upon successful completion, the value 0 is returned; otherwise the
+appropriate error is returned.
+.Sh SEE ALSO
+.Xr vnode 9 ,
+.Xr VOP_DEALLOCATE 9
+.Sh AUTHORS
+.Nm
+and this manual page was written by
+.An Ka Ho Ng Aq Mt khng@FreeBSD.org
+under sponsorship from the FreeBSD Foundation.