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111 lines
3.4 KiB
Groff
111 lines
3.4 KiB
Groff
.\"
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.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. 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(s), this list of conditions and the following disclaimer as
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.\" the first lines of this file unmodified other than the possible
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.\" addition of one or more copyright notices.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice(s), 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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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.\" DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
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.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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.\" 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 SUCH
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.\" DAMAGE.
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.\"
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.Dd August 16, 2018
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.Dt VFS_SET 9
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.Os
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.Sh NAME
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.Nm VFS_SET
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.Nd set up loadable file system
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.Vt vfsconf
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/kernel.h
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.In sys/module.h
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.In sys/mount.h
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.Ft void
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.Fn VFS_SET "struct vfsops *vfsops" "fsname" "int flags"
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.Sh DESCRIPTION
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.Fn VFS_SET
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creates a
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.Vt vfsconf
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structure for the loadable module with the given
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.Fa vfsops , fsname
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and
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.Fa flags ,
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and declares it by calling
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.Xr DECLARE_MODULE 9
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using
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.Fn vfs_modevent
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as the event handler.
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.Pp
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Possible values for the
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.Fa flags
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argument are:
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.Bl -hang -width ".Dv VFCF_DELEGADMIN"
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.It Dv VFCF_STATIC
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File system should be statically available in the kernel.
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.It Dv VFCF_NETWORK
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Network exportable file system.
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.It Dv VFCF_READONLY
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Does not support write operations.
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.It Dv VFCF_SYNTHETIC
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Pseudo file system, data does not represent on-disk files.
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.It Dv VFCF_LOOPBACK
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Loopback file system layer.
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.It Dv VFCF_UNICODE
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File names are stored 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.<fsname>
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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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.It Dv VFCF_SBDRY
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When in VFS method, the thread suspension is deferred to the user
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boundary upon arrival of stop action.
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.El
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.Sh PSEUDOCODE
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.Bd -literal
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/*
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* Fill in the fields for which we have special methods.
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* The others are initially null. This tells vfs to change them to
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* pointers to vfs_std* functions during file system registration.
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*/
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static struct vfsops myfs_vfsops = {
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.vfs_mount = myfs_mount,
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.vfs_root = myfs_root,
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.vfs_statfs = myfs_statfs,
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.vfs_unmount = myfs_unmount,
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};
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VFS_SET(myfs_vfsops, myfs, 0);
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.Ed
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.Sh SEE ALSO
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.Xr jail 2 ,
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.Xr jail 8 ,
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.Xr DECLARE_MODULE 9 ,
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.Xr vfs_modevent 9 ,
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.Xr vfsconf 9
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.Sh AUTHORS
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This manual page was written by
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.An Chad David Aq Mt davidc@acns.ab.ca .
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