NetBSD/lib/libc/sys/quotactl.2

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.\" $NetBSD: quotactl.2,v 1.23 2004/05/13 10:20:58 wiz Exp $
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.\"
.\" This code is derived from software contributed to Berkeley by
.\" Robert Elz at The University of Melbourne.
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.\" @(#)quotactl.2 8.2 (Berkeley) 3/10/95
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.\"
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.Dd March 10, 1995
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.Dt QUOTACTL 2
.Os
.Sh NAME
.Nm quotactl
.Nd manipulate filesystem quotas
.Sh LIBRARY
.Lb libc
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.Sh SYNOPSIS
.In ufs/ufs/quota.h
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.Ft int
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.Fn quotactl "const char *path" "int cmd" "int id" "void *addr"
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.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 ``ffs''
and ``lfs'' filesystem.
For both of them,
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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 ``ffs'' and ``lfs'' specific commands are:
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.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;
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it is normally created with the
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.Xr quotacheck 8
program.
The
.Fa id
argument is unused.
Only the super-user 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 super-user 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
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is a pointer to a
.Fa struct dqblk
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structure (defined in
.Aq Pa ufs/ufs/quota.h ) .
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.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
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is a pointer to a
.Fa struct dqblk
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structure (defined in
.Aq Pa ufs/ufs/quota.h ) .
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The usage fields of the
.Fa dqblk
structure are ignored.
This call is restricted to the super-user.
.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
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is a pointer to a
.Fa struct dqblk
structure (defined in
.Aq Pa ufs/ufs/quota.h ) .
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Only the usage fields are used.
This call is restricted to the super-user.
.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
A successful call returns 0,
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otherwise the value \-1 is returned and the global variable
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.Va errno
indicates the reason for the failure.
.Sh ERRORS
A
.Fn quotactl
call will fail if:
.Bl -tag -width Er
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.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
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or the command type is invalid.
.It Bq Er EACCES
In
.Dv Q_QUOTAON ,
the quota file is not a plain file, or
search permission is denied for a component of a path prefix.
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.It Bq Er ENOTDIR
A component of a path prefix was not a directory.
.It Bq Er ENAMETOOLONG
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A component of a pathname exceeded
.Dv {NAME_MAX}
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characters, or an entire path name exceeded
.Dv {PATH_MAX}
characters.
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.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
.Tn I/O
error occurred while reading from or writing
to a file containing quotas.
.It Bq Er EFAULT
.Fa path
points outside the process's allocated address space, or
an invalid
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.Fa addr
was supplied; the associated structure could not be copied in or out
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of the kernel.
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.It Bq Er EPERM
The call was privileged and the caller was not the super-user.
.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 .
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.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 .