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.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved.
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.\" $FreeBSD$
.\"
.Dd July 8, 2001
.Dt VFS_MOUNT 9
.Os
.Sh NAME
.Nm vfs_mount
.Nd "generic filesystem mount function"
.Sh SYNOPSIS
.In sys/param.h
.In sys/mount.h
.Ft int
.Fn vfs_mount "struct proc *p" "char *fstype" "char *fspath" "int fsflags" "void *fsdata"
.Sh DESCRIPTION
The
.Fn vfs_mount
function handles the generic portion of mounting a filesystem,
and calls the filesystem specific mount function after verifying
its parameters and setting up the structures expected by the
underlying mount code.
.Pp
.Fn vfs_mount
is called directly by the
.Xr mount 2
system call.
.Pp
Its arguments are:
.Bl -tag -width ".Fa fsflags"
.It Fa p
The process responsible for this call.
.It Fa fstype
The type of filesystem being mounted.
.It Fa fspath
The path to the mount point of the filesystem.
.It Fa fsflags
Flags controlling the mount.
See
.Xr mount 2
for details.
.Pp
.Dv MNT_EXPORTED , MNT_NOSUID , MNT_NODEV , MNT_UPDATE , MNT_RELOAD ,
.Dv MNT_FORCE , MNT_ASYNC , MNT_SYNCHRONOUS , MNT_UNION , MNT_NOATIME ,
.Dv MNT_SNAPSHOT , MNT_NOCLUSTERR , MNT_NOCLUSTERW , MNT_IGNORE ,
.Dv MNT_UNION , MNT_NOSYMFOLLOW
.It Fa fsdata
Filesystem specific data structure.
It is in userspace
when passed to
.Fn vfs_mount
and is left untouched when passed to filesystem's
.Fn mount .
.El
.Sh RETURN VALUES
A 0 value is returned on success.
.Sh ERRORS
.Bl -tag -width Er
.It Bq Er ENAMETOOLONG
The fs type or the mount point path is too long or any individual
path component is too long.
.It Bq Er EPERM
Permission denied.
There are a number of reason this can occur
ranging from the user not having permission to mount a filesystem
to the securelevel being to high to load the
.Fa fstype
module.
.It Bq Er EINVAL
Invalid operation (ex: trying to update a non mount-point).
.It Bq Er ENOENT
The mount point does not exist (from
.Fn namei ) .
.It Bq Er ELOOP
The mount point is a muddle of links (from
.Fn namei ) .
.It Bq Er EOPNOTSUPP
The operation is not supported (ex: reloading a r/w filesystem).
.It Bq Er EBUSY
The mount point is busy or is not really a mount point (on update).
.It Bq Er ENOTDIR
The mount point is not a directory.
.It Bq Er ENODEV
The kernel linker was unable to load the specified
.Fa fstype
or was unable to find the specified
.Fa fstype
module.
.El
.Pp
Other errors can be returned by the filesystem's
.Fn mount
and
you should check the specific filesystem for details.
Also
this call relies on a large number of other kernel services
whose errors it returns so this list may not be exhaustive.
.Sh SEE ALSO
.Xr mount 2 ,
.Xr mount 8
.Pp
.Va vfs.usermount
.Sh AUTHORS
This man page was written by
.An Chad David Aq davidc@acns.ab.ca .