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Index: usr.bin/Makefile
===================================================================
--- usr.bin/Makefile
+++ usr.bin/Makefile
@@ -43,6 +43,7 @@
find \
fmt \
fold \
+ fspacectl \
fstat \
fsync \
gcore \
Index: usr.bin/fspacectl/Makefile
===================================================================
--- /dev/null
+++ usr.bin/fspacectl/Makefile
@@ -0,0 +1,8 @@
+# $FreeBSD$
+
+.include <src.opts.mk>
+
+PROG= fspacectl
+LIBADD= util
+
+.include <bsd.prog.mk>
Index: usr.bin/fspacectl/Makefile.depend
===================================================================
--- /dev/null
+++ usr.bin/fspacectl/Makefile.depend
@@ -0,0 +1,17 @@
+# $FreeBSD$
+# Autogenerated - do NOT edit!
+
+DIRDEPS = \
+ include \
+ include/xlocale \
+ lib/${CSU_DIR} \
+ lib/libc \
+ lib/libcompiler_rt \
+ lib/libutil
+
+
+.include <dirdeps.mk>
+
+.if ${DEP_RELDIR} == ${_DEP_RELDIR}
+# local dependencies - needed for -jN in clean tree
+.endif
Index: usr.bin/fspacectl/fspacectl.1
===================================================================
--- /dev/null
+++ usr.bin/fspacectl/fspacectl.1
@@ -0,0 +1,107 @@
+.\"
+.\" Copyright (c) 2021 The FreeBSD Foundation
+.\"
+.\" This manual page was written by Ka Ho Ng <khng@FreeBSD.org>
+.\" 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd Aug 16, 2021
+.Dt FSPACECTL 1
+.Os
+.Sh NAME
+.Nm fspacectl
+.Nd perform space management in a file
+.Sh SYNOPSIS
+.Nm
+.Fl d
+.Bk -words
+.Oo
+.Fl o Xo
+.Sm off
+.Ar offset
+.Op Cm K | k | M | m | G | g | T | t
+.Sm on
+.Xc
+.Oc
+.Fl l Xo
+.Sm off
+.Ar length
+.Op Cm K | k | M | m | G | g | T | t
+.Sm on
+.Xc
+.Ek
+.Ar file
+.Sh DESCRIPTION
+The
+.Nm
+utility performs space management with the given offset and the length over a regular file given on the command-line.
+.Pp
+The following operations are supported and must be one of:
+.Bl -tag -width indent
+.It Fl d
+Zero a region in the specified file.
+If the underlying file system of the given file supports hole-punching,
+file system space deallocation may be performed in the operation region.
+.El
+.Pp
+The following options are available:
+.Bl -tag -width indent
+.It Fl o Ar offset
+The space management operation is performed at the given
+.Ar offset
+bytes in the file.
+If this option is not specified, the operation is performed at the beginning of the file.
+.It Fl l Ar length
+The length of the operation range in bytes. This option must always be specified.
+.El
+.Pp
+The
+.Ar offset
+and
+.Ar length
+arguments may be suffixed with one of
+.Cm K ,
+.Cm M ,
+.Cm G
+or
+.Cm T
+(either upper or lower case) to indicate a multiple of
+Kilobytes, Megabytes, Gigabytes or Terabytes
+respectively.
+.Sh SEE ALSO
+.Xr dd 1 ,
+.Xr truncate 1 ,
+.Xr fspacectl 2 ,
+.Xr fpathconf 2
+.Sh HISTORY
+The
+.Nm
+utility first appeared in
+.Fx 14 .
+.Sh AUTHORS
+The
+.Nm
+utility was written by
+.An Ka Ho Ng Aq Mt khng@FreeBSD.org .
Index: usr.bin/fspacectl/fspacectl.c
===================================================================
--- /dev/null
+++ usr.bin/fspacectl/fspacectl.c
@@ -0,0 +1,116 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2021 The FreeBSD Foundation
+ *
+ * This software was developed by Ka Ho Ng <khng@FreeBSD.org>
+ * 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.
+ *
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <ctype.h>
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <libutil.h>
+
+static void usage(void);
+
+int
+main(int argc, char **argv)
+{
+ int fd;
+ bool do_dealloc;
+ int ch, error;
+ char *fname;
+ off_t offset, length;
+ uint64_t uol;
+ struct spacectl_range sr;
+
+ fd = -1;
+ do_dealloc = false;
+ error = 0;
+ offset = 0;
+ length = -1;
+ while ((ch = getopt(argc, argv, "do:l:")) != -1)
+ switch (ch) {
+ case 'd':
+ do_dealloc = true;
+ break;
+ case 'o':
+ if (expand_number(optarg, &uol) == -1 ||
+ (off_t)uol < 0)
+ errx(EXIT_FAILURE,
+ "invalid offset argument `%s'", optarg);
+
+ offset = uol;
+ break;
+ case 'l':
+ if (expand_number(optarg, &uol) == -1 ||
+ (off_t)uol < 0)
+ errx(EXIT_FAILURE,
+ "invalid length argument `%s'", optarg);
+
+ length = uol;
+ break;
+ default:
+ usage();
+ }
+
+ argv += optind;
+ argc -= optind;
+
+ if (do_dealloc == false || length == -1 || argc < 1)
+ usage();
+
+ fname = *argv;
+ if ((fd = open(fname, O_WRONLY)) == -1)
+ errx(EXIT_FAILURE, "%s", fname);
+
+ sr.r_len = length;
+ sr.r_offset = offset;
+ while ((error = fspacectl(fd, SPACECTL_DEALLOC, &sr, 0, &sr)) != -1 &&
+ sr.r_len != 0);
+ if (error == -1)
+ warn("%s", fname);
+ close(fd);
+
+ return error ? EXIT_FAILURE : EXIT_SUCCESS;
+}
+
+static void
+usage(void)
+{
+ fprintf(stderr,
+ "usage: fspacectl -d [-o offset[K|k|M|m|G|g|T|t]] -l length[K|k|M|m|G|g|T|t] file\n");
+ exit(EXIT_FAILURE);
+}

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