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   7 .TH MOUNT_TMPFS 1M "Mar 18, 2015"
   8 .SH NAME
   9 mount_tmpfs \- mount tmpfs file systems
  11 .LP
  12 .nf
  13 \fBmount\fR [\fB-F\fR tmpfs] [\fB-o\fR \fIspecific_options\fR] [\fB-O\fR] \fIspecial\fR \fImount_point\fR
  14 .fi
  17 .LP
  18 \fBtmpfs\fR is a memory based file system which uses kernel resources relating
  19 to the \fBVM\fR system and page cache as a file system.
  20 .sp
  21 .LP
  22 \fBmount\fR attaches a \fBtmpfs\fR file system to the file system hierarchy at
  23 the pathname location \fImount_point\fR, which must already exist. If
  24 \fImount_point\fR has any contents prior to the \fBmount\fR operation, these
  25 remain hidden until the file system is once again unmounted. The attributes
  26 (mode, owner, and group) of the root of the \fBtmpfs\fR filesystem are
  27 inherited from the underlying \fImount_point\fR, provided that those attributes
  28 are determinable. If not, the root's attributes are set to their default
  29 values. The mode may also be overriden by the \fBmode\fR mount option, which
  30 takes precedence if set.
  31 .sp
  32 .LP
  33 The \fIspecial\fR argument is usually specified as \fBswap\fR but is in fact
  34 disregarded and assumed to be the virtual memory resources within the system.
  36 .ne 2
  37 .na
  38 \fB\fB-o\fR \fIspecific_options\fR\fR
  39 .ad
  40 .RS 23n
  41 Specify \fBtmpfs\fR file system specific options in a comma-separated list with
  42 no intervening spaces. If invalid options are specified, a warning  message is
  43 printed and the invalid options are ignored. The following options are
  44 available:
  45 .sp
  46 .ne 2
  47 .na
  48 \fB\fBremount\fR\fR
  49 .ad
  50 .sp .6
  51 .RS 19n
  52 Remounts a file system with a new size. A size not explicitly
  53 set with \fBremount\fR reverts to no limit.
  54 .RE
  56 .sp
  57 .ne 2
  58 .na
  59 \fBmode=\fIoctalmode\fR\fR
  60 .ad
  61 .RS 19n
  62 The \fImode\fR argument controls the permissions of the \fBtmpfs\fR mount
  63 point.  The argument must be an octal number, of the form passed to
  64 \fBchmod\fR(1).  Only the access mode, setuid, setgid, and sticky bits (a mask
  65 of \fB07777\fR) may be set.  If this option is not provided then the default
  66 mode behaviour, as described above, applies.
  67 .RE
  69 .sp
  70 .sp
  71 .ne 2
  72 .na
  73 \fBsize=\fIsz\fR\fR
  74 .ad
  75 .RS 19n
  76 The \fIsz\fR argument controls the size of this particular \fBtmpfs\fR file
  77 system. If the argument is has a `k' suffix, the number will be interpreted as
  78 a number of kilobytes. An `m' suffix will be interpreted as a number of
  79 megabytes. A `g' suffix will be interpreted as a number of gigabytes. A `%'
  80 suffix will be interpreted as a percentage of the swap space available to the
  81 zone. No suffix is interpreted as bytes. In all cases, the actual size of
  82 the file system is the number of bytes specified, rounded up to the physical
  83 pagesize of the system.
  84 .RE
  86 .sp
  87 .ne 2
  88 .na
  89 \fB\fBxattr\fR | \fBnoxattr\fR\fR
  90 .ad
  91 .RS 19n
  92 Allow or disallow the creation and manipulation of extended attributes. The
  93 default is \fBxattr\fR. See \fBfsattr\fR(5) for a description of extended
  94 attributes.
  95 .RE
  97 .RE
  99 .sp
 100 .ne 2
 101 .na
 102 \fB\fB-O\fR\fR
 103 .ad
 104 .RS 23n
 105 Overlay  mount. Allow the file system to be mounted over an existing mount
 106 point, making the underlying file system inaccessible. If a mount is attempted
 107 on a pre-existing mount point without setting this flag, the mount will fail,
 108 producing the error: \f(CWdevice busy\fR.
 109 .RE
 111 .SH FILES
 112 .ne 2
 113 .na
 114 \fB\fB/etc/mnttab\fR\fR
 115 .ad
 116 .RS 15n
 117 Table of mounted file systems
 118 .RE
 121 .LP
 122 \fBmount\fR(1M), \fBmkdir\fR(2), \fBmount\fR(2), \fBopen\fR(2),
 123 \fBumount\fR(2), \fBmnttab\fR(4), \fBattributes\fR(5), \fBfsattr\fR(5),
 124 \fBtmpfs\fR(7FS)
 125 .SH NOTES
 126 .LP
 127 If the directory on which a file system is to be mounted is a symbolic link,
 128 the file system is mounted on the directory to which the symbolic link refers,
 129 rather than on top of the symbolic link itself.