mount_tmpfs - mount tmpfs file systems
mount [-F tmpfs] [-o specific_options] [-O] special mount_point
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 attributes are determinable. If not,
the root's attributes are set to their default values. The mode may also be
overridden by the mode mount option, which takes precedence if
set.
The special argument is usually specified as swap
but is in fact disregarded and assumed to be the virtual memory resources
within the system.
-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 following options are available:
remount
Remounts a file system with a new size. A size not
explicitly set with remount reverts to no limit.
mode=octalmode
The
mode argument controls the permissions of the
tmpfs mount point. The argument must be an octal number, of the form
passed to
chmod(1). Only the access mode, setuid, setgid, and sticky
bits (a mask of
07777) may be set. If this option is not provided then
the default mode behaviour, as described above, applies.
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 kilobytes. An `m' suffix will be
interpreted as a number of megabytes. A `g' suffix will be interpreted as a
number of gigabytes. A `%' suffix will be interpreted as a percentage of the
swap space available to the zone. 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.
xattr | noxattr
Allow or disallow the creation and manipulation of
extended attributes. The default is
xattr. See
fsattr(7) 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 error: device
busy.
/etc/mnttab
Table of mounted file systems
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.