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+.\" -*- nroff -*-
+.\"
+.\" Copyright (c) 1996 Doug Rabson
+.\"
+.\" All rights reserved.
+.\"
+.\" This program is free software.
+.\"
+.\" 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 DEVELOPERS ``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 DEVELOPERS 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 May 29, 2021
+.Dt VFS_QUOTACTL 9
+.Os
+.Sh NAME
+.Nm VFS_QUOTACTL
+.Nd manipulate file system quotas
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/mount.h
+.In sys/vnode.h
+.Ft int
+.Fn VFS_QUOTACTL "struct mount *mp" "int cmds" "uid_t uid" "void *arg" "bool *mp_busy"
+.Sh DESCRIPTION
+Implement file system quotas.
+.Pp
+The
+.Fa mp_busy
+argument is an input/output parameter.
+.Fn VFS_QUOTACTL
+must be called with
+.Fa mp
+marked busy through
+.Xr vfs_busy 9
+and
+.Fa *mp_busy
+set to true.
+The filesystem implementation of
+.Fn VFS_QUOTACTL
+may then unbusy
+.Fa mp
+using
+.Xr vfs_unbusy 9
+prior to performing quota file I/O.
+In this case the implementation must set
+.Fa *mp_busy
+to false to indicate that the caller must not unbusy
+.Fa mp
+upon completion of
+.Fn VFS_QUOTACTL .
+.Pp
+See
+.Xr quotactl 2
+for a description of the remaining arguments.
+.Sh SEE ALSO
+.Xr quotactl 2 ,
+.Xr vnode 9
+.Sh AUTHORS
+This manual page was written by
+.An Doug Rabson .