quotactl(2) - NetBSD Manual Pages

QUOTACTL(2)               NetBSD System Calls Manual               QUOTACTL(2)


NAME

     quotactl -- manipulate filesystem quotas


LIBRARY

     Standard C Library (libc, -lc)


SYNOPSIS

     #include <ufs/ufs/quota.h>

     int
     quotactl(const char *path, int cmd, int id, void *addr);


DESCRIPTION

     The quotactl() call enables, disables and manipulates filesystem quotas.
     A quota control command given by cmd operates on the given filename path
     for the given user id.  The address of an optional command specific data
     structure, addr, may be given; its interpretation is discussed below with
     each command.

     Currently quotas are supported only for the ``ffs'' and ``lfs'' filesys-
     tem.  For both of them, a command is composed of a primary command (see
     below) and a command type used to interpret the id.  Types are supported
     for interpretation of user identifiers and group identifiers.  The
     ``ffs'' and ``lfs'' specific commands are:

     Q_QUOTAON  Enable disk quotas for the filesystem specified by path.  The
                command type specifies the type of the quotas being enabled.
                The addr argument specifies a file from which to take the quo-
                tas.  The quota file must exist; it is normally created with
                the quotacheck(8) program.  The id argument is unused.  Only
                the super-user may turn quotas on.

     Q_QUOTAOFF
                Disable disk quotas for the filesystem specified by path.  The
                command type specifies the type of the quotas being disabled.
                The addr and id arguments are unused.  Only the super-user may
                turn quotas off.

     Q_GETQUOTA
                Get disk quota limits and current usage for the user or group
                (as determined by the command type) with identifier id.  addr
                is a pointer to a struct dqblk structure (defined in
                <ufs/ufs/quota.h>).

     Q_SETQUOTA
                Set disk quota limits for the user or group (as determined by
                the command type) with identifier id.  addr is a pointer to a
                struct dqblk structure (defined in <ufs/ufs/quota.h>).  The
                usage fields of the dqblk structure are ignored.  This call is
                restricted to the super-user.

     Q_SETUSE   Set disk usage for the user or group (as determined by the
                command type) with identifier id.  addr is a pointer to a
                struct dqblk structure (defined in <ufs/ufs/quota.h>).  Only
                the usage fields are used.  This call is restricted to the
                super-user.

     Q_SYNC     Update the on-disk copy of quota usages.  The command type
                specifies which type of quotas are to be updated.  The id and
                addr parameters are ignored.


RETURN VALUES

     A successful call returns 0, otherwise the value -1 is returned and the
     global variable errno indicates the reason for the failure.


ERRORS

     A quotactl() call will fail if:

     [EOPNOTSUPP]       The kernel has not been compiled with the QUOTA
                        option.

     [EUSERS]           The quota table cannot be expanded.

     [EINVAL]           cmd or the command type is invalid.

     [EACCES]           In Q_QUOTAON, the quota file is not a plain file, or
                        search permission is denied for a component of a path
                        prefix.

     [ENOTDIR]          A component of a path prefix was not a directory.

     [ENAMETOOLONG]     A component of a pathname exceeded {NAME_MAX} charac-
                        ters, or an entire path name exceeded {PATH_MAX} char-
                        acters.

     [ENOENT]           A filename does not exist.

     [ELOOP]            Too many symbolic links were encountered in translat-
                        ing a pathname.

     [EROFS]            In Q_QUOTAON, the quota file resides on a read-only
                        filesystem.

     [EIO]              An I/O error occurred while reading from or writing to
                        a file containing quotas.

     [EFAULT]           path points outside the process's allocated address
                        space, or an invalid addr was supplied; the associated
                        structure could not be copied in or out of the kernel.

     [EPERM]            The call was privileged and the caller was not the
                        super-user.


SEE ALSO

     quota(1), fstab(5), edquota(8), quotacheck(8), quotaon(8), repquota(8)


HISTORY

     The quotactl() function call appeared in 4.3BSD-Reno.


BUGS

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

NetBSD 5.1                      October 9, 2008                     NetBSD 5.1