QUOTACTL(4I) Ioctl Requests QUOTACTL(4I)

NAME

quotactl - manipulate disk quotas

SYNOPSIS

#include <sys/fs/ufs_quota.h>

int ioctl(int fd, Q_QUOTACTL, struct quotctl *qp);

DESCRIPTION

This ioctl() call manipulates disk quotas. fd is the file descriptor
returned by the open(2) system call after opening the quotas file
(located in the root directory of the filesystem running quotas).
Q_QUOTACTL is defined in /usr/include/sys/fs/ufs_quota.h. qp is the
address of the quotctl structure which is defined as

struct quotctl {
int op;
uid_t uid;
caddr_t addr;
};

op indicates an operation to be applied to the user ID uid. (See
below.) 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 value of op below.

Q_QUOTAON Turn on quotas for a file system. addr points to the full
pathname of the quotas file. uid is ignored. It is
recommended that uid have the value of 0. This call is
restricted to the super-user.

Q_QUOTAOFF Turn off quotas for a file system. addr and uid are
ignored. It is recommended that addr have the value of
NULL and uid have the value of 0. This call is restricted
to the super-user.

Q_GETQUOTA Get disk quota limits and current usage for user uid. addr
is a pointer to a dqblk structure (defined in
<sys/fs/ufs_quota.h>). Only the super-user may get the
quotas of a user other than himself.

Q_SETQUOTA Set disk quota limits and current usage for user uid. addr
is a pointer to a dqblk structure (defined in
<sys/fs/ufs_quota.h>). This call is restricted to the
super-user.

Q_SETQLIM Set disk quota limits for user uid. addr is a pointer to a
dqblk structure (defined in <sys/fs/ufs_quota.h>). This
call is restricted to the super-user.

Q_SYNC Update the on-disk copy of quota usages for this file
system. addr and uid are ignored.

Q_ALLSYNC Update the on-disk copy of quota usages for all file
systems with active quotas. addr and uid are ignored.

RETURN VALUES

This Fn ioctl returns:

0 on success.

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

FILES

/usr/include/sys/fs/ufs_quota.h
quota-related structure/function definitions and defines

ERRORS

EFAULT addr is invalid.

EINVAL The kernel has not been compiled with the QUOTA option. op is
invalid.

ENOENT The quotas file specified by addr does not exist.

EPERM The call is privileged and the calling process did not assert
{PRIV_SYS_MOUNT} in the effective set.

ESRCH No disk quota is found for the indicated user. Quotas have not
been turned on for this file system.

EUSERS The quota table is full.

If op is Q_QUOTAON, ioctl() 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 file system pointed to by special.

EIO Internal I/O error while attempting to read the quotas file
pointed to by addr.

SEE ALSO

getrlimit(2), mount(2), quota(8), quotacheck(8), quotaon(8)

BUGS

There should be some way to integrate this call with the resource limit
interface provided by setrlimit(2) and getrlimit(2).

This call is incompatible with Melbourne quotas.

illumos October 28, 2017 illumos