QUOTACTL(7I)QUOTACTL(7I)NAMEquotactl - manipulate disk quotas
SYNOPSIS
#include <sys/fs/ufs_quota.h>
int ioctl(int fd, Q_QUOTACTL, struct quotcl *qp)
DESCRIPTION
This ioctl() call manipulates disk quotas. fd is the file descriptor
returned by the open() 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 recom‐
mended 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 sys‐
tems with active quotas. addr and uid are ignored.
RETURN VALUES
This ioctl() returns:
0
on success.
−1
on failure and sets errno to indicate the error.
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.
FILES
/usr/include/sys/fs/ufs_quota.h
quota-related structure/function definitions and defines
SEE ALSOquota(1M), quotacheck(1M), quotaon(1M), getrlimit(2), mount(2)BUGS
There should be some way to integrate this call with the resource limit
interface provided by setrlimit() and getrlimit(2).
This call is incompatible with Melbourne quotas.
Jun 14, 2004 QUOTACTL(7I)
