VFS_SET (9)

Leading comments

Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
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1. Redistributions of source code must retain the above copyright
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(The comments found at the beginning of the groff file "man9/VFS_SET.9freebsd".)

NAME

VFS_SET - set up loadable file system Vt vfsconf

SYNOPSIS

In sys/param.h In sys/kernel.h In sys/module.h In sys/mount.h Ft void Fn VFS_SET struct vfsops *vfsops fsname int flags

DESCRIPTION

Fn VFS_SET creates a Vt vfsconf structure for the loadable module with the given Fa vfsops , fsname and Fa flags , and declares it by calling DECLARE_MODULE9 using Fn vfs_modevent as the event handler.

Possible values for the Fa flags argument are:

VFCF_STATIC

File system should be statically available in the kernel.

VFCF_NETWORK

Network exportable file system.

VFCF_READONLY

Does not support write operations.

VFCF_SYNTHETIC

Pseudo file system, data does not represent on-disk files.

VFCF_LOOPBACK

Loopback file system layer.

VFCF_UNICODE

File names are stored as Unicode.

VFCF_JAIL

Can be mounted from within a jail if security.jail.mount_allowed sysctl is set to 1

VFCF_DELEGADMIN

Supports delegated administration if vfs.usermount sysctl is set to 1

VFCF_SBDRY

When in VFS method, the thread suspension is deferred to the user boundary upon arrival of stop action.

PSEUDOCODE

/*
 * Fill in the fields for which we have special methods.
 * The others are initially null.  This tells vfs to change them to
 * pointers to vfs_std* functions during file system registration.
 */
static struct vfsops myfs_vfsops = {
        .vfs_mount =    myfs_mount,
        .vfs_root =     myfs_root,
        .vfs_statfs =   myfs_statfs,
        .vfs_unmount =  myfs_unmount,
};

VFS_SET(myfs_vfsops, myfs, 0);

SEE ALSO

jail(2), jail(8), DECLARE_MODULE9, vfsconf(9), vfs_modevent9

AUTHORS

This manual page was written by An Chad David Aq davidc@acns.ab.ca .