1 '\" te 2 .\" Copyright (c) 2003, Sun Microsystems, Inc. All Rights Reserved 3 .\" Copyright 2015 Joyent, Inc. 4 .\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License. 5 .\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License. 6 .\" When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner] 7 .TH MOUNT_TMPFS 1M "Mar 18, 2015" 8 .SH NAME 9 mount_tmpfs \- mount tmpfs file systems 10 .SH SYNOPSIS 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 15 16 .SH DESCRIPTION 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. 35 .SH OPTIONS 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 55 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 68 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 85 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 96 97 .RE 98 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 110 111 .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 119 120 .SH SEE ALSO 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.