.\"	$OpenBSD: quotactl.2,v 1.15 2015/01/19 15:54:11 millert Exp $
.\"	$NetBSD: quotactl.2,v 1.8 1995/02/27 12:35:43 cgd Exp $
.\"
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.\"	@(#)quotactl.2	8.1 (Berkeley) 6/4/93
.\"
.Dd $Mdocdate: January 19 2015 $
.Dt QUOTACTL 2
.Os
.Sh NAME
.Nm quotactl
.Nd manipulate filesystem quotas
.Sh SYNOPSIS
.In ufs/ufs/quota.h
.In unistd.h
.Ft int
.Fn quotactl "const char *path" "int cmd" "int id" "char *addr"
.Sh DESCRIPTION
The
.Fn quotactl
call enables, disables and
manipulates filesystem quotas.
A quota control command
given by
.Fa cmd
operates on the given filename
.Fa path
for the given user
.Fa id .
The address of an optional command specific data structure,
.Fa addr ,
may be given; its interpretation
is discussed below with each command.
.Pp
Currently quotas are supported only for the
.Dq ffs
filesystem.
For
.Dq ffs ,
a command is composed of a primary command (see below)
and a command type used to interpret the
.Fa id .
Types are supported for interpretation of user identifiers
and group identifiers.
The
.Dq ffs
specific commands are:
.Bl -tag -width Q_QUOTAON
.It Dv Q_QUOTAON
Enable disk quotas for the filesystem specified by
.Fa path .
The command type specifies the type of the quotas being enabled.
The
.Fa addr
argument specifies a file from which to take the quotas.
The quota file must exist;
it is normally created with the
.Xr quotacheck 8
program.
The
.Fa id
argument is unused.
Only the superuser may turn quotas on.
.It Dv Q_QUOTAOFF
Disable disk quotas for the filesystem specified by
.Fa path .
The command type specifies the type of the quotas being disabled.
The
.Fa addr
and
.Fa id
arguments are unused.
Only the superuser may turn quotas off.
.It Dv Q_GETQUOTA
Get disk quota limits and current usage for the user or group
(as determined by the command type) with identifier
.Fa id .
.Fa addr
is a pointer to a
.Li struct dqblk
structure.
.It Dv Q_SETQUOTA
Set disk quota limits for the user or group
(as determined by the command type) with identifier
.Fa id .
.Fa addr
is a pointer to a
.Li struct dqblk
structure.
The usage fields of
.Li struct dqblk
structure are ignored.
This call is restricted to the superuser.
.It Dv Q_SETUSE
Set disk usage limits for the user or group
(as determined by the command type) with identifier
.Fa id .
.Fa addr
is a pointer to a
.Li struct dqblk
structure.
Only the usage fields are used.
This call is restricted to the superuser.
.It Dv Q_SYNC
Update the on-disk copy of quota usages.
The command type specifies which type of quotas are to be updated.
The
.Fa id
and
.Fa addr
parameters are ignored.
.El
.Sh RETURN VALUES
.Rv -std
.Sh ERRORS
A
.Fn quotactl
call will fail if:
.Bl -tag -width Er
.It Bq Er EOPNOTSUPP
The kernel has not been compiled with the
.Dv QUOTA
option.
.It Bq Er EUSERS
The quota table cannot be expanded.
.It Bq Er EINVAL
.Fa cmd
or the command type is invalid.
.It Bq Er EACCES
In
.Dv Q_QUOTAON ,
the quota file is not a plain file.
.It Bq Er EACCES
Search permission is denied for a component of a path prefix.
.It Bq Er ENOTDIR
A component of a path prefix was not a directory.
.It Bq Er ENAMETOOLONG
A component of a pathname exceeded
.Dv NAME_MAX
characters, or an entire pathname (including the terminating NUL)
exceeded
.Dv PATH_MAX
bytes.
.It Bq Er ENOENT
A filename does not exist.
.It Bq Er ELOOP
Too many symbolic links were encountered in translating a pathname.
.It Bq Er EROFS
In
.Dv Q_QUOTAON ,
the quota file resides on a read-only filesystem.
.It Bq Er EIO
An I/O error occurred while reading from or writing
to a file containing quotas.
.It Bq Er EFAULT
An invalid
.Fa addr
was supplied; the associated structure could not be copied in or out
of the kernel.
.It Bq Er EFAULT
.Fa path
points outside the process's allocated address space.
.It Bq Er EPERM
The call was privileged and the caller was not the superuser.
.El
.Sh SEE ALSO
.Xr quota 1 ,
.Xr fstab 5 ,
.Xr edquota 8 ,
.Xr quotacheck 8 ,
.Xr quotaon 8 ,
.Xr repquota 8
.Sh HISTORY
The
.Fn quotactl
function call appeared in
.Bx 4.3 Reno .
.Sh BUGS
There should be some way to integrate this call with the resource
limit interface provided by
.Xr setrlimit 2
and
.Xr getrlimit 2 .