Manual Pages for UNIX Operating System command usage for man mount_tmpfs

System Administration Commands                    mount_tmpfs(1M)



NAME
     mount_tmpfs - mount tmpfs file systems

SYNOPSIS
     mount [-F tmpfs] [-o specific_options] [-O] special mount_point


DESCRIPTION
     tmpfs is a  memory  based  file  system  which  uses  kernel
     resources relating to the VM system and page cache as a file
     system.


     mount attaches a  tmpfs  file  system  to  the  file  system
     hierarchy  at  the pathname location mount_point, which must
     already exist. If mount_point has any contents prior to  the
     mount  operation,  these remain hidden until the file system
     is once again unmounted. The attributes  (mode,  owner,  and
     group)  of  the  root  of the tmpfs filesystem are inherited
     from the underlying mount_point, provided that those  attri-
     butes  are  determinable.  If not, the root's attributes are
     set to their default values.


     The special argument is usually specified as swap but is  in
     fact  disregarded  and  assumed  to  be  the  virtual memory
     resources within the system.

OPTIONS
     -o specific_options    Specify tmpfs  file  system  specific
                            options  in  a  comma-separated  list
                            with  no   intervening   spaces.   If
                            invalid   options  are  specified,  a
                            warning  message is printed  and  the
                            invalid options are ignored. The fol-
                            lowing options are available:

                            size=sz            The  sz   argument
                                               controls  the size
                                               of this particular
                                               tmpfs file system.
                                               If the argument is
                                               has  a `k' suffix,
                                               the number will be
                                               interpreted  as  a
                                               number  of   kilo-
                                               bytes. An `m' suf-
                                               fix will be inter-
                                               preted as a number
                                               of  megabytes.  No
                                               suffix  is  inter-
                                               preted  as  bytes.



SunOS 5.11          Last change: 24 Nov 2003                    1






System Administration Commands                    mount_tmpfs(1M)



                                               In  all cases, the
                                               actual size of the
                                               file system is the
                                               number  of   bytes
                                               specified, rounded
                                               up to the physical
                                               pagesize   of  the
                                               system.


                            xattr | noxattr    Allow or  disallow
                                               the  creation  and
                                               manipulation    of
                                               extended    attri-
                                               butes. The default
                                               is    xattr.   See
                                               fsattr(5)  for   a
                                               description     of
                                               extended    attri-
                                               butes.



     -O                     Overlay  mount. Allow the file system
                            to  be mounted over an existing mount
                            point,  making  the  underlying  file
                            system  inaccessible.  If  a mount is
                            attempted  on  a  pre-existing  mount
                            point  without setting this flag, the
                            mount will fail, producing the error-
                            device busy.


FILES
     /etc/mnttab    Table of mounted file systems


ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Availability                | SUNWcs                      |
    |_____________________________|_____________________________|


SEE ALSO




SunOS 5.11          Last change: 24 Nov 2003                    2






System Administration Commands                    mount_tmpfs(1M)



     mount(1M),   mkdir(2),   mount(2),    open(2),    umount(2),
     mnttab(4), attributes(5), fsattr(5), tmpfs(7FS)

NOTES
     If the directory on which a file system is to be mounted  is
     a symbolic link, the file system is mounted on the directory
     to which the symbolic link refers, rather than on top of the
     symbolic link itself.















































SunOS 5.11          Last change: 24 Nov 2003                    3