386 lines
11 KiB
C
386 lines
11 KiB
C
/*
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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 8.3 (Berkeley) 1/4/94
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* $Id: vfs_init.c,v 1.36 1998/10/25 10:52:34 bde Exp $
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/mount.h>
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#include <sys/sysctl.h>
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#include <sys/vnode.h>
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#include <sys/malloc.h>
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#include <vm/vm_zone.h>
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static void vfs_op_init __P((void));
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static void vfsinit __P((void *));
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SYSINIT(vfs, SI_SUB_VFS, SI_ORDER_FIRST, vfsinit, NULL)
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MALLOC_DEFINE(M_VNODE, "vnodes", "Dynamically allocated vnodes");
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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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extern struct vnodeop_desc *vfs_op_descs[];
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/* and the operations they perform */
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/*
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* XXX this bloat just exands the sysctl__vfs linker set a little so that
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* we can attach sysctls for VFS modules without expanding the linker set.
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* Currently (1998/09/06), only one VFS uses sysctls, so 2 extra linker
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* set slots are more than sufficient.
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*/
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extern struct linker_set sysctl__vfs;
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static int mod_xx;
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SYSCTL_INT(_vfs, OID_AUTO, mod0, CTLFLAG_RD, &mod_xx, 0, "");
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SYSCTL_INT(_vfs, OID_AUTO, mod1, CTLFLAG_RD, &mod_xx, 0, "");
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/*
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* Zone for namei
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*/
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struct vm_zone *namei_zone;
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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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* Without an explicit reserve area, however, you must replace vnode_if.c
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* and vnode_if.h when you do this, or you will be derefrencing of the
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* end of vfs_op_descs[]. This is a flaw in the use of a structure
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* pointer array rather than an agregate to define vfs_op_descs. So
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* it's not a very dynamic "feature".
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*/
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void
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vfs_opv_init(struct vnodeopv_desc *opv)
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{
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int j, k;
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vop_t ***opv_desc_vector_p;
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vop_t **opv_desc_vector;
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struct vnodeopv_entry_desc *opve_descp;
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/*
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* Allocate the dynamic vectors and fill them in.
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*/
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opv_desc_vector_p = opv->opv_desc_vector_p;
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/*
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* Allocate and init the vector, if it needs it.
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* Also handle backwards compatibility.
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*/
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if (*opv_desc_vector_p == NULL) {
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/* XXX - shouldn't be M_VNODE */
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MALLOC(*opv_desc_vector_p, vop_t **,
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vfs_opv_numops * sizeof(vop_t *), M_VNODE,
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M_WAITOK);
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bzero(*opv_desc_vector_p,
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vfs_opv_numops * sizeof(vop_t *));
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DODEBUG(printf("vector at %x allocated\n",
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opv_desc_vector_p));
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}
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opv_desc_vector = *opv_desc_vector_p;
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for (j = 0; opv->opv_desc_ops[j].opve_op; j++) {
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opve_descp = &(opv->opv_desc_ops[j]);
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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 !=
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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,
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"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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* Finally, go back and replace unfilled routines
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* with their default. (Sigh, an O(n^3) algorithm. I
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* could make it better, but that'd be work, and n is small.)
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*/
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opv_desc_vector = *(opv->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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}
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for (k = 0; k<vfs_opv_numops; k++)
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if (opv_desc_vector[k] == NULL)
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opv_desc_vector[k] =
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opv_desc_vector[VOFFSET(vop_default)];
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}
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/*
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* Initialize known vnode operations vectors.
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*/
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static 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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DODEBUG(printf ("vfs_opv_numops=%d\n", vfs_opv_numops));
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#ifdef unused
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/*
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* Set all vnode vectors to a well known value.
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*/
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for (i = 0; vfs_opv_descs[i]; i++)
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*(vfs_opv_descs[i]->opv_desc_vector_p) = NULL;
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#endif
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/*
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* assign each op to its offset
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*
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* XXX This should not be needed, but is because the per
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* XXX FS ops tables are not sorted according to the
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* XXX vnodeop_desc's offset in vfs_op_descs. This
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* XXX is the same reason we have to take the hit for
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* XXX the static inline function calls instead of using
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* XXX simple macro references.
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*/
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for (i = 0; i < vfs_opv_numops; i++)
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vfs_op_descs[i]->vdesc_offset = i;
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#ifdef unused
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/* Finish the job */
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for (i = 0; vfs_opv_descs[i]; i++)
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vfs_opv_init(vfs_opv_descs[i]);
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#endif
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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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extern struct vnodeops dead_vnodeops;
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extern struct vnodeops spec_vnodeops;
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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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/* ARGSUSED*/
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static void
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vfsinit(dummy)
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void *dummy;
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{
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namei_zone = zinit("NAMEI", MAXPATHLEN, 0, 0, 2);
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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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* Build vnode operation vectors.
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*/
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vfs_op_init();
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/*
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* Initialize each file system type.
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* Vfs type numbers must be distinct from VFS_GENERIC (and VFS_VFSCONF).
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*/
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vattr_null(&va_null);
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maxvfsconf = VFS_GENERIC + 1;
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}
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int
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vfs_register(vfc)
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struct vfsconf *vfc;
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{
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struct linker_set *l;
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struct sysctl_oid **oidpp;
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struct vfsconf *vfsp;
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int i, exists;
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vfsp = NULL;
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l = &sysctl__vfs;
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if (vfsconf)
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for (vfsp = vfsconf; vfsp->vfc_next; vfsp = vfsp->vfc_next)
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if (!strcmp(vfc->vfc_name, vfsp->vfc_name))
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return EEXIST;
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vfc->vfc_typenum = maxvfsconf++;
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if (vfc->vfc_vfsops->vfs_oid != NULL) {
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/*
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* Attach the oid to the "vfs" node of the sysctl tree if
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* it isn't already there (it will be there for statically
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* configured vfs's).
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*/
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exists = 0;
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for (i = l->ls_length,
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oidpp = (struct sysctl_oid **)l->ls_items;
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i-- != 0; oidpp++)
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if (*oidpp == vfc->vfc_vfsops->vfs_oid) {
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exists = 1;
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break;
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}
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if (exists == 0)
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for (i = l->ls_length,
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oidpp = (struct sysctl_oid **)l->ls_items;
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i-- != 0; oidpp++) {
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if (*oidpp == NULL ||
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*oidpp == &sysctl___vfs_mod0 ||
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*oidpp == &sysctl___vfs_mod1) {
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*oidpp = vfc->vfc_vfsops->vfs_oid;
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break;
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}
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}
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vfc->vfc_vfsops->vfs_oid->oid_number = vfc->vfc_typenum;
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sysctl_order_all();
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}
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if (vfsp)
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vfsp->vfc_next = vfc;
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else
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vfsconf = vfc;
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vfc->vfc_next = NULL;
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/*
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* Call init function for this VFS...
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*/
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(*(vfc->vfc_vfsops->vfs_init))(vfc);
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return 0;
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}
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/*
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* To be called at SI_SUB_VFS, SECOND, for each VFS before any are registered.
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*/
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void
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vfs_mod_opv_init(handle)
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void *handle;
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{
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struct vnodeopv_desc *opv;
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opv = (struct vnodeopv_desc *)handle;
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*(opv->opv_desc_vector_p) = NULL;
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vfs_opv_init(opv);
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}
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int
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vfs_unregister(vfc)
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struct vfsconf *vfc;
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{
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struct linker_set *l;
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struct sysctl_oid **oidpp;
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struct vfsconf *vfsp, *prev_vfsp;
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int error, i, maxtypenum;
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i = vfc->vfc_typenum;
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prev_vfsp = NULL;
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for (vfsp = vfsconf; vfsp;
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prev_vfsp = vfsp, vfsp = vfsp->vfc_next) {
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if (!strcmp(vfc->vfc_name, vfsp->vfc_name))
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break;
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}
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if (vfsp == NULL)
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return EINVAL;
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if (vfsp->vfc_refcount)
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return EBUSY;
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if (vfc->vfc_vfsops->vfs_uninit != NULL) {
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error = (*vfc->vfc_vfsops->vfs_uninit)(vfsp);
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if (error)
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return (error);
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}
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if (prev_vfsp)
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prev_vfsp->vfc_next = vfsp->vfc_next;
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else
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vfsconf = vfsp->vfc_next;
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if (vfsp->vfc_vfsops->vfs_oid != NULL) {
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l = &sysctl__vfs;
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for (i = l->ls_length,
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oidpp = (struct sysctl_oid **)l->ls_items;
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i--; oidpp++) {
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if (*oidpp == vfsp->vfc_vfsops->vfs_oid) {
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*oidpp = NULL;
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sysctl_order_all();
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break;
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}
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}
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}
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maxtypenum = VFS_GENERIC;
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for (vfsp = vfsconf; vfsp != NULL; vfsp = vfsp->vfc_next)
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if (maxtypenum < vfsp->vfc_typenum)
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maxtypenum = vfsp->vfc_typenum;
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maxvfsconf = maxtypenum + 1;
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return 0;
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}
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