1.\" Copyright (c) 1996 Doug Rabson 2.\" 3.\" All rights reserved. 4.\" 5.\" This program is free software. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR 17.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, 20.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26.\" 27.\" $FreeBSD: src/share/man/man9/VFS_MOUNT.9,v 1.7.2.1 2001/12/17 11:30:18 ru Exp $ 28.\" 29.Dd December 16, 2012 30.Dt VFS_MOUNT 9 31.Os 32.Sh NAME 33.Nm VFS_MOUNT 34.Nd mount a filesystem 35.Sh SYNOPSIS 36.In sys/param.h 37.In sys/mount.h 38.In sys/vnode.h 39.Ft int 40.Fn VFS_MOUNT "struct mount *mp" "char *path" "caddr_t data" "struct ucred *cred" 41.Sh DESCRIPTION 42Mount a filesystem into the system's namespace. 43.Pp 44Its arguments are: 45.Bl -tag -width data 46.It Ar mp 47Structure representing the filesystem. 48.It Ar path 49Pathname where the filesystem is being mounted. 50.It Ar data 51Filesystem specific data. 52This should be read into the kernel using 53.Xr copyin 9 . 54.It Ar cred 55Pointer to a 56.Vt struct ucred 57for user credentials checking. 58.El 59.Pp 60This is called both to mount new filesystems and to change the 61attributes of an existing filesystem. 62If the 63.Dv MNT_UPDATE 64flag is set in 65.Fa mp->mnt_flag 66then the filesystem should update its internal state from the value of 67.Fa mp->mnt_flag . 68This can be used, for instance, to convert a read-only filesystem to 69read-write. 70It is also used by 71.Xr mountd 8 72to update the NFS export information for the filesystem. 73.Pp 74If the 75.Dv MNT_UPDATE 76flag is not specified, then this is a newly mounted filesystem. 77The filesystem code should allocate and initialize 78any private data needed to represent the filesystem (it can use the 79.Fa mp->mnt_data 80field to store this information). 81.Sh SEE ALSO 82.Xr VFS 9 , 83.Xr vnode 9 84.Sh AUTHORS 85This man page was written by 86.An Doug Rabson . 87