quotactl - phpMan

QUOTACTL(2) QUOTACTL(2)

NAME
quotactl - manipulate disk quotas

SYNOPSIS
#include <linux/quota.h>
#include <xfs/xqm.h>
#include <linux/dqblk_v1.h>
#include <linux/dqblk_v2.h>

long quotactl(int cmd, char âˆâˆ—special, qid_t id, caddr_t addr)

DESCRIPTION
The quotactl() call manipulates disk quotas. cmd indicates a command to be applied
to UID id or GID id. To set the type of quota use the QCMD(cmd, type) macro. spe-
cial is a pointer to a null-terminated string containing the path name of the block
special device for the filesystem being manipulated. addr is the address of an
optional, command specific, data structure which is copied in or out of the system.
The interpretation of addr is given with each command below.

Q_QUOTAON Turn on quotas for a filesystem. id is the identification number of
the quota format to be used. Format numbers are defined in the
header file of appropriate format. Currently there are two supported
quota formats whose numbers are defined by constants QFMT_VFS_OLD
(original quota format) and QFMT_VFS_V0 (new VFS v0 quota format).
addr points to the path name of file containing the quotas for the
filesystem. The quota file must exist; it is normally created with
the quotacheck(8) program. This call is restricted to the super-
user.

Q_QUOTAOFF Turn off quotas for a filesystem. addr and id are ignored. This
call is restricted to the super-user.

Q_GETQUOTA Get disk quota limits and current usage for user or group id. addr
is a pointer to an if_dqblk structure (defined in <linux/quota.h>).
The field dqb_valid defines the entries in the structure which are
set correctly. On Q_GETQUOTA call all entries are valid. Only the
super-user may get the quotas of a user other than himself.

Q_SETQUOTA Set current quota information for user or group id. addr is a
pointer to an if_dqblk structure (defined in <linux/quota.h>). The
field dqb_valid defines which entries in the quota structure are
valid and should be set. The constants for dqb_valid field are
defined in the <linux/quota.h> header file. This call obsoletes
calls Q_SETQLIM and Q_SETUSE in the previous quota interfaces. This
call is restricted to the super-user.

Q_GETINFO Get information (like grace times) about quotafile. addr should be
a pointer to an if_dqinfo structure (defined in <linux/quota.h>).
The dqi_valid field in the structure defines entries in it which are
valid. On Q_GETINFO call all entries are valid. Parameter id is
ignored.

Q_SETINFO Set information about quotafile. addr should be a pointer to
if_dqinfo structure (defined in <linux/quota.h>). The field
dqi_valid defines which entries in the quota info structure are
valid and should be set. The constants for dqi_valid field are
defined in the <linux/quota.h> header file. This call obsoletes
calls Q_SETGRACE and Q_SETFLAGS in the previous quota interfaces.
Parameter id is ignored. This operation is restricted to super-user.

Q_GETFMT Get quota format used on the specified filesystem. addr should be a
pointer to a memory (4 bytes) where the format number will be
stored.

Q_SYNC Update the on-disk copy of quota usages for a filesystem. If spe-
cial is null then all filesystems with active quotas are syncâ€™ed.
addr and id are ignored.

Q_GETSTATS Get statistics and other generic information about quota subsystem.
addr should be a pointer to dqstats structure (defined in
<linux/quota.h>) in which data should be stored. special and id are
ignored.

For XFS filesystems making use of the XFS Quota Manager (XQM), the above commands
are bypassed and the following commands are used:

Q_XQUOTAON Turn on quotas for an XFS filesystem. XFS provides the ability to
turn on/off quota limit enforcement with quota accounting. There-
fore, XFS expects the addr to be a pointer to an unsigned int that
contains either the flags XFS_QUOTA_UDQ_ACCT and/or
XFS_QUOTA_UDQ_ENFD (for user quota), or XFS_QUOTA_GDQ_ACCT and/or
XFS_QUOTA_GDQ_ENFD (for group quota), as defined in <xfs/xqm.h>.
This call is restricted to the superuser.

Q_XQUOTAOFF Turn off quotas for an XFS filesystem. As in Q_QUOTAON, XFS
filesystems expect a pointer to an unsigned int that specifies
whether quota accounting and/or limit enforcement need to be turned
off. This call is restricted to the superuser.

Q_XGETQUOTA Get disk quota limits and current usage for user id. addr is a
pointer to a fs_disk_quota structure (defined in <xfs/xqm.h>). Only
the superuser may get the quotas of a user other than himself.

Q_XSETQLIM Set disk quota limits for user id. addr is a pointer to a
fs_disk_quota structure (defined in <xfs/xqm.h>). This call is
restricted to the superuser.

Q_XGETQSTAT Returns a fs_quota_stat structure containing XFS filesystem specific
quota information. This is useful in finding out how much space is
spent to store quota information, and also to get quotaon/off status
of a given local XFS filesystem.

Q_XQUOTARM Free the disk space taken by disk quotas. Quotas must have already
been turned off.

There is no command equivalent to Q_SYNC for XFS since sync(1) writes quota infor-
mation to disk (in addition to the other filesystem metadata it writes out).

RETURN VALUES
quotactl() returns:

0 on success.

-1 on failure and sets errno to indicate the error.

ERRORS
EFAULT addr or special are invalid.

ENOSYS The kernel has not been compiled with the QUOTA option.

EINVAL

cmd or type is invalid.

ENOENT The file specified by special or addr does not exist.

ENOTBLK special is not a block device.

EPERM The call is privileged and the caller was not the super-user.

ESRCH No disc quota is found for the indicated user.

Quotas have not been turned on for this filesystem.

If cmd is Q_QUOTAON, quotactl() may set errno to:

EACCES The quota file pointed to by addr exists but is not a regular file.

The quota file pointed to by addr exists but is not on the filesys-
tem pointed to by special.

EINVAL The quota file is corrupted.

ESRCH Specified quota format was not found.

EBUSY Q_QUOTAON attempted while another Q_QUOTAON has already taken place.

SEE ALSO
quota(1), getrlimit(2), quotacheck(8), quotaon(8)

QUOTACTL(2)

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