263 lines
6.9 KiB
Groff
263 lines
6.9 KiB
Groff
.\" Copyright (c) 1983, 1990, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" Robert Elz at The University of Melbourne.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)quotactl.2 8.2 (Berkeley) 3/10/95
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.\"
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.Dd March 30, 2020
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.Dt QUOTACTL 2
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.Os
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.Sh NAME
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.Nm quotactl
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.Nd manipulate file system quotas
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/types.h
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.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
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The
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.Fn quotactl
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system call enables, disables and
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manipulates file system quotas.
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A quota control command
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given by
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.Fa cmd
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operates on the given filename
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.Fa path
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for the given user or group
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.Fa id .
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(NOTE: One should use the QCMD macro defined in
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.In ufs/ufs/quota.h
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to formulate the value for
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.Fa cmd . )
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The address of an optional command specific data structure,
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.Fa addr ,
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may be given; its interpretation
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is discussed below with each command.
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.Pp
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For commands that use the
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.Fa id
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identifier, it must be either -1 or any positive value.
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The value of -1 indicates that the current UID or GID should be used.
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Any other negative value will return an error.
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.Pp
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Currently quotas are supported only for the
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.Dq ufs
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file system.
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For
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.Dq ufs ,
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a command is composed of a primary command (see below)
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and a command type used to interpret the
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.Fa id .
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Types are supported for interpretation of user identifiers (USRQUOTA)
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and group identifiers (GRPQUOTA).
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The
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.Dq ufs
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specific commands are:
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.Bl -tag -width Q_GETQUOTASIZEx
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.It Dv Q_QUOTAON
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Enable disk quotas for the file system specified by
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.Fa path .
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The command type specifies the type of the quotas being enabled.
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The
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.Fa addr
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argument specifies a file from which to take the quotas.
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The quota file must exist;
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it is normally created with the
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.Xr quotacheck 8
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program.
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The
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.Fa id
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argument is unused.
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Only the super-user may turn quotas on.
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.It Dv Q_QUOTAOFF
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Disable disk quotas for the file system specified by
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.Fa path .
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The command type specifies the type of the quotas being disabled.
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The
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.Fa addr
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and
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.Fa id
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arguments are unused.
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Only the super-user may turn quotas off.
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.It Dv Q_GETQUOTASIZE
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Get the wordsize used to represent the quotas for the user or group
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(as determined by the command type).
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Possible values are 32 for the old-style quota file
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and 64 for the new-style quota file.
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The
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.Fa addr
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argument is a pointer to an integer into which the size is stored.
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The identifier
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.Fa id
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is not used.
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.It Dv Q_GETQUOTA
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Get disk quota limits and current usage for the user or group
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(as determined by the command type) with identifier
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.Fa id .
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The
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.Fa addr
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argument
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is a pointer to a
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.Fa struct dqblk
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structure (defined in
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.In ufs/ufs/quota.h ) .
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.It Dv Q_SETQUOTA
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Set disk quota limits for the user or group
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(as determined by the command type) with identifier
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.Fa id .
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The
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.Fa addr
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argument
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is a pointer to a
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.Fa struct dqblk
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structure (defined in
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.In ufs/ufs/quota.h ) .
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The usage fields of the
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.Fa dqblk
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structure are ignored.
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This system call is restricted to the super-user.
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.It Dv Q_SETUSE
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Set disk usage limits for the user or group
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(as determined by the command type) with identifier
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.Fa id .
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The
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.Fa addr
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argument
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is a pointer to a
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.Fa struct dqblk
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structure (defined in
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.In ufs/ufs/quota.h ) .
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Only the usage fields are used.
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This system call is restricted to the super-user.
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.It Dv Q_SYNC
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Update the on-disk copy of quota usages.
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The command type specifies which type of quotas are to be updated.
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The
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.Fa id
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and
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.Fa addr
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arguments are ignored.
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.El
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.Sh RETURN VALUES
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.Rv -std quotactl
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.Sh ERRORS
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The
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.Fn quotactl
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system call will fail if:
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.Bl -tag -width Er
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.It Bq Er EOPNOTSUPP
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The kernel has not been compiled with the
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.Dv QUOTA
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option.
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.It Bq Er EUSERS
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The quota table cannot be expanded.
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.It Bq Er EINVAL
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The
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.Fa cmd
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argument
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or the command type is invalid.
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In
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.Dv Q_GETQUOTASIZE ,
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.Dv Q_GETQUOTA ,
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.Dv Q_SETQUOTA ,
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and
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.Dv Q_SETUSE ,
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quotas are not currently enabled for this file system.
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.Pp
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The
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.Fa id
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argument to
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.Dv Q_GETQUOTA ,
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.Dv Q_SETQUOTA
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or
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.Dv Q_SETUSE
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is a negative value.
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.It Bq Er EACCES
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In
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.Dv Q_QUOTAON ,
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the quota file is not a plain file.
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.It Bq Er EACCES
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Search permission is denied for a component of a path prefix.
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.It Bq Er ENOTDIR
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A component of a path prefix was not a directory.
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.It Bq Er ENAMETOOLONG
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A component of either pathname exceeded 255 characters,
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or the entire length of either path name exceeded 1023 characters.
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.It Bq Er ENOENT
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A filename does not exist.
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.It Bq Er ELOOP
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Too many symbolic links were encountered in translating a pathname.
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.It Bq Er EROFS
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In
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.Dv Q_QUOTAON ,
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either the file system on which quotas are to be enabled is mounted read-only
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or the quota file resides on a read-only file system.
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.It Bq Er EIO
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An
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.Tn I/O
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error occurred while reading from or writing
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to a file containing quotas.
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.It Bq Er EINTEGRITY
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Corrupted data was detected while reading from the file system.
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.It Bq Er EFAULT
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An invalid
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.Fa addr
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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 EFAULT
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The
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.Fa path
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argument
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points outside the process's allocated address space.
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.It Bq Er EPERM
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The call was privileged and the caller was not the super-user.
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.El
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.Sh SEE ALSO
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.Xr quota 1 ,
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.Xr fstab 5 ,
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.Xr edquota 8 ,
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.Xr quotacheck 8 ,
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.Xr quotaon 8 ,
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.Xr repquota 8
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.Sh HISTORY
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The
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.Fn quotactl
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system call appeared in
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.Bx 4.3 Reno .
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.Sh BUGS
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There should be some way to integrate this call with the resource
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limit interface provided by
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.Xr setrlimit 2
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and
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.Xr getrlimit 2 .
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