DragonFly On-Line Manual Pages

Search: Section:  

QUOTACTL(2)              DragonFly System Calls Manual             QUOTACTL(2)


NAME

     quotactl - manipulate filesystem quotas


LIBRARY

     Standard C Library (libc, -lc)


SYNOPSIS

     #include <sys/types.h>
     #include <vfs/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.  (NOTE: One should use the QCMD macro defined in
     <vfs/ufs/quota.h> to formulate the value for cmd.) 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 "ufs" filesystem.  For "ufs",
     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 (USRQUOTA) and group identifiers (GRPQUOTA).  The "ufs"
     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 quotas.  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 <vfs/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 <vfs/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 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 <vfs/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

     The quotactl() function returns the value 0 if successful; otherwise the
     value -1 is returned and the global variable errno is set to indicate the
     error.


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.  In Q_GETQUOTA and
                        Q_SETQUOTA, quotas are not currently enabled for this
                        filesystem.

     [EACCES]           In Q_QUOTAON, the quota file is not a plain file.

     [EACCES]           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 either pathname exceeded 255
                        characters, or the entire length of either path name
                        exceeded 1023 characters.

     [ENOENT]           A filename does not exist.

     [ELOOP]            Too many symbolic links were encountered in
                        translating 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]           An invalid addr was supplied; the associated structure
                        could not be copied in or out of the kernel.

     [EFAULT]           Path points outside the process's allocated address
                        space.

     [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).

DragonFly 6.1-DEVELOPMENT      February 21, 2020     DragonFly 6.1-DEVELOPMENT

Search: Section: