116 lines
3.7 KiB
C
116 lines
3.7 KiB
C
/* $NetBSD: vfs_hooks.c,v 1.2 2005/12/11 12:24:30 christos Exp $ */
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/*-
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* Copyright (c) 2005 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Julio M. Merino Vidal.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* VFS hooks.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: vfs_hooks.c,v 1.2 2005/12/11 12:24:30 christos Exp $");
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#include <sys/param.h>
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#include <sys/mount.h>
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/*
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* Static list of file system specific hook sets supported by the kernel.
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*/
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__link_set_decl(vfs_hooks, struct vfs_hooks);
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/*
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* Initialize a VFS hook set that does nothing. This is to ensure that
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* we have, at the very least, one item in the link set. Otherwise,
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* ld(1) will complain.
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*/
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static struct vfs_hooks null_hooks = {
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NULL /* vh_unmount */
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};
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VFS_HOOKS_ATTACH(null_hooks);
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/*
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* Macro to be used in one of the vfs_hooks_* function for hooks that
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* return an error code. Calls will stop as soon as one of the hooks
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* fails.
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*/
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#define VFS_HOOKS_W_ERROR(func, args) \
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int error; \
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struct vfs_hooks * const *hp; \
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\
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error = 0; \
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\
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__link_set_foreach(hp, vfs_hooks) { \
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if ((*hp)-> func != NULL) { \
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error = (*hp)-> func args; \
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if (error != 0) \
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break; \
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} \
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} \
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\
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return error;
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/*
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* Macro to be used in one of the vfs_hooks_* function for hooks that
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* do not return any error code. All hooks will be executed
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* unconditionally.
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*/
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#define VFS_HOOKS_WO_ERROR(func, fargs, hook, hargs) \
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void \
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func fargs \
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{ \
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struct vfs_hooks * const *hp; \
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\
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__link_set_foreach(hp, vfs_hooks) { \
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if ((*hp)-> hook != NULL) \
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(*hp)-> hook hargs; \
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} \
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}
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/*
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* Routines to iterate over VFS hooks lists and execute them.
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*/
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VFS_HOOKS_WO_ERROR(vfs_hooks_unmount, (struct mount *mp), vh_unmount, (mp));
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/*
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void
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vfs_hooks_unmount(struct mount *mp)
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{
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VFS_HOOKS_WO_ERROR(vh_unmount, (mp));
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}
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*/
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