284001a222
jails since FreeBSD 7. Along with the system call, put the various security.jail.allow_foo and security.jail.foo_allowed sysctls partly under COMPAT_FREEBSD11 (or BURN_BRIDGES). These sysctls had two disparate uses: on the system side, they were global permissions for jails created via jail(2) which lacked fine-grained permission controls; inside a jail, they're read-only descriptions of what the current jail is allowed to do. The first use is obsolete along with jail(2), but keep them for the second-read-only use. Differential Revision: D14791
119 lines
3.4 KiB
Groff
119 lines
3.4 KiB
Groff
.\" Copyright (c) 1995
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)kvm_getvfsbyname.3 8.3 (Berkeley) 5/4/95
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.\" $FreeBSD$
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.\"
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.Dd August 16, 2018
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.Dt GETVFSBYNAME 3
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.Os
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.Sh NAME
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.Nm getvfsbyname
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.Nd get information about a file system
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/mount.h
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.Ft int
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.Fn getvfsbyname "const char *name" "struct xvfsconf *vfc"
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.Sh DESCRIPTION
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The
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.Fn getvfsbyname
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function provides access to information about a
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file system module that is configured in the kernel.
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If successful,
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the requested file system
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.Fa xvfsconf
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is returned in the location pointed to by
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.Fa vfc .
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The fields in a
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.Dq Li struct xvfsconf
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are defined as follows:
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.Pp
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.Bl -tag -compact -width vfc_refcount
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.It vfc_name
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the name of the file system
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.It vfc_typenum
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the file system type number assigned by the kernel
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.It vfc_refcount
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the number of active mount points using the file system
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.It vfc_flags
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flag bits, as described below
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.El
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.Pp
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The flags are defined as follows:
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.Pp
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.Bl -tag -width VFCF_DELEGADMIN -compact
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.It Dv VFCF_STATIC
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statically compiled into kernel
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.It Dv VFCF_NETWORK
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may get data over the network
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.It Dv VFCF_READONLY
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writes are not implemented
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.It Dv VFCF_SYNTHETIC
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data does not represent real files
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.It Dv VFCF_LOOPBACK
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aliases some other mounted FS
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.It Dv VFCF_UNICODE
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stores file names as Unicode
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.It Dv VFCF_JAIL
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can be mounted from within a jail if
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.Va allow.mount
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and
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.Va allow.mount.<vfc_name>
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jail parameters are set
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.It Dv VFCF_DELEGADMIN
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supports delegated administration if
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.Va vfs.usermount
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sysctl is set to
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.Dv 1
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.El
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.Sh RETURN VALUES
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.Rv -std getvfsbyname
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.Sh ERRORS
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The following errors may be reported:
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.Bl -tag -width Er
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.It Bq Er ENOENT
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The
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.Fa name
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argument
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specifies a file system that is unknown or not configured in the kernel.
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.El
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.Sh SEE ALSO
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.Xr jail 2 ,
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.Xr mount 2 ,
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.Xr sysctl 3 ,
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.Xr jail 8 ,
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.Xr mount 8 ,
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.Xr sysctl 8
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.Sh HISTORY
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A variant of the
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.Fn getvfsbyname
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function first appeared in
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.Fx 2.0 .
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