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+.\"-
+.\" Copyright (c) 2008 Dag-Erling Coïdan Smørgrav
+.\" All rights reserved.
+.\"
+.\" 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 February 14, 2009
+.Dt QUOTAFILE 3
+.Os
+.Sh NAME
+.Nm quota_open
+.Nm quota_read
+.Nm quota_write_limits
+.Nm quota_write_usage
+.Nm quota_close
+.Nd "Manipulate quotas"
+.Sh LIBRARY
+.Lb libutil
+.Sh SYNOPSIS
+.In ufs/ufs/quota.h
+.In libutil.h
+.In fstab.h
+.Ft "struct quotafile *"
+.Fn quota_open "struct fstab *fs" "int quotatype" "int openflags"
+.Ft int
+.Fn quota_read "struct quotafile *qf" "struct dqblk *dqb" "int id"
+.Ft int
+.Fn quota_write_limits "struct quotafile *qf" "struct dqblk *dqb" "int id"
+.Ft int
+.Fn quota_write_usage "struct quotafile *qf" "struct dqblk *dqb" "int id"
+.Ft int
+.Fn quota_close "struct quotafile *qf"
+.Sh DESCRIPTION
+These functions are designed to simplify access to filesystem quotas.
+If quotas are active on a filesystem,
+these functions will access them directly from the kernel using the
+.Fn quotactl
+system call.
+If quotas are not active,
+these functions will access them by reading and writing
+the quota files directly.
+.Pp
+The
+.Fn quota_open
+function takes a pointer to an
+.Vt fstab
+entry corresponding to the filesystem on which quotas
+are to be accessed.
+The
+.Va quotatype
+field indicates the type of quotas being sought, either
+.Dv USRQUOTA
+or
+.Dv GRPQUOTA .
+The
+.Va openflags
+are those used by the
+.Fn open
+system call, usually either
+.Dv O_RDONLY
+if the quotas are just to be read, or
+.Dv O_RDWR
+if the quotas are to be updated.
+The
+.Dv O_CREAT
+flag should be specified if a new quota file of the requested type should
+be created if it does not already exist.
+.Pp
+The
+.Fn quota_read
+function reads the quota from the filesystem and quota type referenced by
+.Va qf
+for the user (or group) specified by
+.Va id
+into the
+.Vt dqblk
+quota structure pointed to by
+.Va dqb .
+.Pp
+The
+.Fn quota_write_limits
+function updates the limit fields (but not the usage fields)
+for the filesystem and quota type referenced by
+.Va qf
+for the user (or group) specified by
+.Va id
+from the
+.Vt dqblk
+quota structure pointed to by
+.Va dqb .
+.Pp
+The
+.Fn quota_write_usage
+function updates the usage fields (but not the limit fields)
+for the filesystem and quota type referenced by
+.Va qf
+for the user (or group) specified by
+.Va id
+from the
+.Vt dqblk
+quota structure pointed to by
+.Va dqb .
+.Pp
+The
+.Fn quota_close
+function closes any open file descriptors and frees any storage
+associated with the filesystem and quota type referenced by
+.Va qf .
+.Sh RETURN VALUES
+If the filesystem has quotas associated with it,
+.Fn quota_open
+returns a pointer to a 
+.Vt quotafile
+structure used in subsequent quota access calls.
+If the filesystem has no quotas, or access permission is denied
+.Dv NULL
+is returned and
+.Va errno
+is set to indicate the cause of failure.
+.Pp
+The
+.Fn quota_read ,
+.Fn quota_write_limits ,
+.Fn quota_write_usage ,
+and
+.Fn quota_close
+functions return zero on success.
+On error they return
+.Dv -1
+and set
+.Va errno
+to indicate the cause of failure.
+.Sh SEE ALSO
+.Xr quotactl 2 ,
+.Xr quota.user 5 ,
+.Xr quota.group 5
+.Sh HISTORY
+The
+.Nm
+functions first appeared in
+.Fx 8.0 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+functions and this manual page were written by
+.An Dag-Erling Sm\(/orgrav Aq des@FreeBSD.org 
+and
+.An Marshall Kirk McKusick .