351 lines
10 KiB
C
351 lines
10 KiB
C
/* $NetBSD: vfs_init.c,v 1.15 1999/11/15 18:49:09 fvdl Exp $ */
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/*-
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* Copyright (c) 1998 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 Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center.
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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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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed
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* to Berkeley by John Heidemann of the UCLA Ficus project.
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*
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* Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project
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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 University of
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* California, Berkeley and its contributors.
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* 4. 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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* @(#)vfs_init.c 8.5 (Berkeley) 5/11/95
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*/
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#include <sys/param.h>
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#include <sys/mount.h>
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#include <sys/time.h>
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#include <sys/vnode.h>
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#include <sys/stat.h>
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#include <sys/namei.h>
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#include <sys/ucred.h>
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#include <sys/buf.h>
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#include <sys/errno.h>
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#include <sys/malloc.h>
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#include <sys/systm.h>
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/*
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* Sigh, such primitive tools are these...
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*/
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#if 0
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#define DODEBUG(A) A
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#else
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#define DODEBUG(A)
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#endif
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/*
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* The global list of vnode operations.
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*/
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extern struct vnodeop_desc *vfs_op_descs[];
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/*
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* These vnodeopv_descs are listed here because they are not
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* associated with any particular file system, and thus cannot
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* be initialized by vfs_attach().
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*/
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extern struct vnodeopv_desc dead_vnodeop_opv_desc;
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extern struct vnodeopv_desc fifo_vnodeop_opv_desc;
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extern struct vnodeopv_desc spec_vnodeop_opv_desc;
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extern struct vnodeopv_desc sync_vnodeop_opv_desc;
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struct vnodeopv_desc *vfs_special_vnodeopv_descs[] = {
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&dead_vnodeop_opv_desc,
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&fifo_vnodeop_opv_desc,
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&spec_vnodeop_opv_desc,
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&sync_vnodeop_opv_desc,
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NULL,
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};
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/*
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* This code doesn't work if the defn is **vnodop_defns with cc.
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* The problem is because of the compiler sometimes putting in an
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* extra level of indirection for arrays. It's an interesting
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* "feature" of C.
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*/
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int vfs_opv_numops;
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typedef int (*PFI) __P((void *));
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void vfs_opv_init_explicit __P((struct vnodeopv_desc *));
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void vfs_opv_init_default __P((struct vnodeopv_desc *));
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void vfs_op_init __P((void));
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/*
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* A miscellaneous routine.
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* A generic "default" routine that just returns an error.
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*/
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/*ARGSUSED*/
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int
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vn_default_error(v)
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void *v;
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{
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return (EOPNOTSUPP);
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}
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/*
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* vfs_init.c
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*
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* Allocate and fill in operations vectors.
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*
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* An undocumented feature of this approach to defining operations is that
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* there can be multiple entries in vfs_opv_descs for the same operations
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* vector. This allows third parties to extend the set of operations
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* supported by another layer in a binary compatibile way. For example,
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* assume that NFS needed to be modified to support Ficus. NFS has an entry
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* (probably nfs_vnopdeop_decls) declaring all the operations NFS supports by
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* default. Ficus could add another entry (ficus_nfs_vnodeop_decl_entensions)
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* listing those new operations Ficus adds to NFS, all without modifying the
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* NFS code. (Of couse, the OTW NFS protocol still needs to be munged, but
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* that is a(whole)nother story.) This is a feature.
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*/
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/*
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* Init the vector, if it needs it.
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* Also handle backwards compatibility.
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*/
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void
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vfs_opv_init_explicit(vfs_opv_desc)
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struct vnodeopv_desc *vfs_opv_desc;
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{
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int (**opv_desc_vector) __P((void *));
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struct vnodeopv_entry_desc *opve_descp;
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opv_desc_vector = *(vfs_opv_desc->opv_desc_vector_p);
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for (opve_descp = vfs_opv_desc->opv_desc_ops;
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opve_descp->opve_op;
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opve_descp++) {
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/*
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* Sanity check: is this operation listed
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* in the list of operations? We check this
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* by seeing if its offest is zero. Since
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* the default routine should always be listed
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* first, it should be the only one with a zero
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* offset. Any other operation with a zero
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* offset is probably not listed in
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* vfs_op_descs, and so is probably an error.
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*
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* A panic here means the layer programmer
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* has committed the all-too common bug
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* of adding a new operation to the layer's
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* list of vnode operations but
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* not adding the operation to the system-wide
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* list of supported operations.
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*/
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if (opve_descp->opve_op->vdesc_offset == 0 &&
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opve_descp->opve_op->vdesc_offset != VOFFSET(vop_default)) {
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printf("operation %s not listed in %s.\n",
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opve_descp->opve_op->vdesc_name, "vfs_op_descs");
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panic ("vfs_opv_init: bad operation");
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}
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/*
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* Fill in this entry.
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*/
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opv_desc_vector[opve_descp->opve_op->vdesc_offset] =
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opve_descp->opve_impl;
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}
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}
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void
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vfs_opv_init_default(vfs_opv_desc)
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struct vnodeopv_desc *vfs_opv_desc;
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{
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int j;
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int (**opv_desc_vector) __P((void *));
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opv_desc_vector = *(vfs_opv_desc->opv_desc_vector_p);
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/*
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* Force every operations vector to have a default routine.
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*/
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if (opv_desc_vector[VOFFSET(vop_default)] == NULL)
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panic("vfs_opv_init: operation vector without default routine.");
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for (j = 0; j < vfs_opv_numops; j++)
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if (opv_desc_vector[j] == NULL)
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opv_desc_vector[j] =
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opv_desc_vector[VOFFSET(vop_default)];
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}
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void
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vfs_opv_init(vopvdpp)
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struct vnodeopv_desc **vopvdpp;
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{
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int (**opv_desc_vector) __P((void *));
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int i;
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/*
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* Allocate the vectors.
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*/
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for (i = 0; vopvdpp[i] != NULL; i++) {
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/* XXX - shouldn't be M_VNODE */
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opv_desc_vector =
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malloc(vfs_opv_numops * sizeof(PFI), M_VNODE, M_WAITOK);
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memset(opv_desc_vector, 0, vfs_opv_numops * sizeof(PFI));
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*(vopvdpp[i]->opv_desc_vector_p) = opv_desc_vector;
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DODEBUG(printf("vector at %p allocated\n",
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opv_desc_vector_p));
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}
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/*
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* ...and fill them in.
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*/
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for (i = 0; vopvdpp[i] != NULL; i++)
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vfs_opv_init_explicit(vopvdpp[i]);
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/*
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* Finally, go back and replace unfilled routines
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* with their default.
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*/
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for (i = 0; vopvdpp[i] != NULL; i++)
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vfs_opv_init_default(vopvdpp[i]);
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}
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void
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vfs_opv_free(vopvdpp)
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struct vnodeopv_desc **vopvdpp;
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{
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int i;
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/*
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* Free the vectors allocated in vfs_opv_init().
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*/
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for (i = 0; vopvdpp[i] != NULL; i++) {
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/* XXX - shouldn't be M_VNODE */
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free(*(vopvdpp[i]->opv_desc_vector_p), M_VNODE);
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*(vopvdpp[i]->opv_desc_vector_p) = NULL;
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}
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}
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void
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vfs_op_init()
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{
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int i;
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DODEBUG(printf("Vnode_interface_init.\n"));
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/*
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* Figure out how many ops there are by counting the table,
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* and assign each its offset.
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*/
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for (vfs_opv_numops = 0, i = 0; vfs_op_descs[i]; i++) {
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vfs_op_descs[i]->vdesc_offset = vfs_opv_numops;
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vfs_opv_numops++;
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}
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DODEBUG(printf ("vfs_opv_numops=%d\n", vfs_opv_numops));
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}
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/*
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* Routines having to do with the management of the vnode table.
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*/
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struct vattr va_null;
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/*
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* Initialize the vnode structures and initialize each file system type.
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*/
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void
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vfsinit()
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{
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extern struct vfsops *vfs_list_initial[];
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int i;
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/*
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* Initialize the vnode table
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*/
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vntblinit();
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/*
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* Initialize the vnode name cache
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*/
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nchinit();
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/*
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* Initialize the list of vnode operations.
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*/
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vfs_op_init();
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/*
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* Initialize the special vnode operations.
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*/
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vfs_opv_init(vfs_special_vnodeopv_descs);
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/*
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* Establish each file system which was statically
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* included in the kernel.
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*/
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vattr_null(&va_null);
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for (i = 0; vfs_list_initial[i] != NULL; i++) {
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if (vfs_attach(vfs_list_initial[i])) {
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printf("multiple `%s' file systems",
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vfs_list_initial[i]->vfs_name);
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panic("vfsinit");
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}
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}
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}
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