quotactl

Set disk quotas

SYNTAX
       #include <linux/quota.h>

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

DESCRIPTION
       The  quotactl()  call  manipulates disk quotas.  cmd indi­
       cates 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 program.  This call
                      is restricted to the super-user.

       Q_QUOTAOFF     Turn off quotas for a  file  system.   addr
                      and   uid   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  him­
                      self.

       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 uid are ignored.

RETURN VALUES

        0     on success.

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

Related commands:

quota - Display disk usage and limits
getrlimit -
quotacheck - Scan a file system for disk usage
quotaon -
ulimit - Limit user resources