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  par-
                 ticular  tmpfs  file  system. If the argument is
                 has a `k' suffix, 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 system is the number  of
                 bytes  specified,  rounded  up  to  the physical
                 pagesize of the system.

           suid | nosuid
                 Allow or disallow setuid execution. The  default
                 is suid.

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

     -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:

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

SEE ALSO

     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.