quotactl(2) manualpage

# NAME

quotactl - manipulate disk quotas

# SYNOPSIS

#include <linux/quota.h>

int quotactl(cmd, special, uid, addr)
int cmd;
char **special;
int 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.

Special is a pointer to a null-terminated string containing the path name of the block special device for the file system 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 file system. addr points to the path name of file containing the quotas for the file system. 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 file system. 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 a dqblk structure (defined in <linux/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 or group id . Addr is a pointer to a dqblk structure (defined in <linux/quota.h> ). This call is restricted to the super-user.
- Q_SETQLIM
  Set disk quota limits for user or group id . Addr is a pointer to a dqblk structure (defined in <linux/quota.h> ). This call is restricted to the super-user.
- Q_SYNC
  Update the on-disk copy of quota usages for a file system. If special is null then all file systems with active quotas are sync'ed. Addr and id are ignored.

# RETURN VALUES

quotactl returns:

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

# ERRORS

- EFAULT
  addr or special are invalid.
- EINVAL
  The kernel has not been compiled with the QUOTA option or cmd 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 file system.
- EUSERS
  The quota table is full.

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.
- EBUSY
  Q_QUOTAON attempted while another Q_QUOTAON has already taken place.

# SEE ALSO

quota (1), quotacheck (8), quotaon (8),