Maintenance Commands                              mount_tmpfs(1M)

NAME
     mount_tmpfs - mount tmpfs file systems

SYNOPSIS
     mount [  -F  tmpfs  ]  [  -o  size=  sz  ]  [ -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 size=sz
           The sz argument controls the size of  this  particular
           tmpfs  file  system. If the argument is has a `k' suf-
           fix, the number will be interpreted  as  a  number  of
           kilobytes.  An  `m'  suffix  will  be interpreted as a
           number of  megabytes.  No  suffix  is  interpreted  as
           bytes.  In all cases, the actual size of the file sys-
           tem is the number of bytes specified,  rounded  up  to
           the physical pagesize of the system.

     -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 errordevice busy.

FILES
     /etc/mnttab
           table of mounted file systems

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

SunOS 5.8           Last change: 29 Aug 1995                    1

Maintenance Commands                              mount_tmpfs(1M)

     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Availability                | SUNWcsu                     |
    |_____________________________|_____________________________|

SEE ALSO
     mount(1M),   mkdir(2),   mount(2),    open(2),    umount(2),
     mnttab(4), attributes(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 5.8           Last change: 29 Aug 1995                    2