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quotactl(2) - quotactl, quotactl - manipulate disk quota - man 2 quotactl

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QUOTACTL(2)                Linux Programmer's Manual               QUOTACTL(2)

       quotactl - manipulate disk quota(1,8)

       #include <sys/types.h>
       #include <sys/quota.h>

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

       #include <linux/unistd.h>

       _syscall4(int,  quotactl,  int,  cmd,  const char *, special , int, id,
       caddr_t, addr);

       The quota(1,8) system defines for each user and/or group a soft limit and  a
       hard  limit  bounding  the  amount  of disk space that can be used on a
       given file(1,n) system.  The hard limit cannot be crossed.  The  soft  limit
       can  be  crossed, but warnings will ensue. Moreover, the user cannot be
       above the soft limit for more than one week (by  default)  at  a  time:
       after this week the soft limit counts as hard limit.

       The quotactl system call manipulates these quota. Its first argument is
       of the form QCMD(subcmd,type) where type is either USRQUOTA or GRPQUOTA
       (for user quota(1,8) and group quota(1,8), respectively), and subcmd is described

       The second argument special is the block  special  device  these  quota(1,8)
       apply to.  It must be mounted.

       The  third  argument  id  is  the user or group ID these quota(1,8) apply to
       (when relevant).

       The fourth argument addr is the address of a data structure,  depending
       on the command.

       The subcmd is one of

       Q_QUOTAON  Enable  quota. The addr argument is the pathname of the file(1,n)
                  containing the quota(1,8) for the filesystem.

       Q_QUOTAOFF Disable quota.

       Q_GETQUOTA Get limits and current usage of disk space. The  addr  argu-
                  ment   is  a  pointer  to  a  dqblk  structure  (defined  in(1,8)

       Q_SETQUOTA Set limits and current usage; addr is as before.

       Q_SETQLIM  Set limits; addr is as before.

       Q_SETUSE   Set usage.

       Q_SYNC     Sync disk copy of a filesystem's quota.

       Q_GETSTATS Get collected stats.

       On success, quotactl returns 0. On error(8,n), -1 is returned, and errno  is
       set(7,n,1 builtins) appropriately.

       EACCES   The quota(1,8) file(1,n) is not an ordinary file.

       EBUSY    Q_QUOTAON was asked, but quota(1,8) were enabled already.

       EFAULT   Bad addr value.

       EINVAL   type  is  not  a  known  quota(1,8)  type. Or, special could not be

       EIO      Cannot read(2,n,1 builtins) or write(1,2) the quota(1,8) file.

       EMFILE   Too many open(2,3,n) files: cannot open(2,3,n) quota(1,8) file.

       ENODEV   special cannot be found in(1,8) the mount(2,8) table.

       ENOPKG   The kernel was compiled without quota(1,8) support.

       ENOTBLK  special is not a block special device.

       EPERM    The process was not root (for the file(1,n) system), and Q_GETQUOTA
                was  asked  for another id than that of the process itself, or
                anything other than Q_GETSTATS or Q_SYNC was asked.

       ESRCH    Q_GETQUOTA or Q_SETQUOTA or Q_SETUSE or  Q_SETQLIM  was  asked
                for a file(1,n) system that didn't have quota(1,8) enabled.


       quota(1,8)(1),  getrlimit(2),  setrlimit(2),  ulimit(3), quotacheck(8), quo-

Linux 1.3.88                      1996-04-14                       QUOTACTL(2)

References for this manual (incoming links)