/* * Copyright (c) 1989, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed * to Berkeley by John Heidemann of the UCLA Ficus project. * * Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)vfs_init.c 8.3 (Berkeley) 1/4/94 * $Id: vfs_init.c,v 1.31 1997/10/26 20:26:33 phk Exp $ */ #include <sys/param.h> #include <sys/systm.h> #include <sys/kernel.h> #include <sys/mount.h> #include <sys/vnode.h> #include <sys/malloc.h> #include <vm/vm_zone.h> static void vfs_op_init __P((void)); static void vfsinit __P((void *)); SYSINIT(vfs, SI_SUB_VFS, SI_ORDER_FIRST, vfsinit, NULL) MALLOC_DEFINE(M_VNODE, "vnodes", "Dynamically allocated vnodes"); /* * Sigh, such primitive tools are these... */ #if 0 #define DODEBUG(A) A #else #define DODEBUG(A) #endif static struct vfsconf void_vfsconf; extern struct linker_set vfs_opv_descs_; #define vfs_opv_descs ((struct vnodeopv_desc **)vfs_opv_descs_.ls_items) extern struct linker_set vfs_set; extern struct vnodeop_desc *vfs_op_descs[]; /* and the operations they perform */ /* * Zone for namei */ struct vm_zone *namei_zone; /* * vfs_init.c * * Allocate and fill in operations vectors. * * An undocumented feature of this approach to defining operations is that * there can be multiple entries in vfs_opv_descs for the same operations * vector. This allows third parties to extend the set of operations * supported by another layer in a binary compatibile way. For example, * assume that NFS needed to be modified to support Ficus. NFS has an entry * (probably nfs_vnopdeop_decls) declaring all the operations NFS supports by * default. Ficus could add another entry (ficus_nfs_vnodeop_decl_entensions) * listing those new operations Ficus adds to NFS, all without modifying the * NFS code. (Of couse, the OTW NFS protocol still needs to be munged, but * that is a(whole)nother story.) This is a feature. * * Without an explicit reserve area, however, you must replace vnode_if.c * and vnode_if.h when you do this, or you will be derefrencing of the * end of vfs_op_descs[]. This is a flaw in the use of a structure * pointer array rather than an agregate to define vfs_op_descs. So * it's not a very dynamic "feature". */ void vfs_opv_init(struct vnodeopv_desc **them) { int i, j, k; vop_t ***opv_desc_vector_p; vop_t **opv_desc_vector; struct vnodeopv_entry_desc *opve_descp; /* * Allocate the dynamic vectors and fill them in. */ for (i=0; them[i]; i++) { opv_desc_vector_p = them[i]->opv_desc_vector_p; /* * Allocate and init the vector, if it needs it. * Also handle backwards compatibility. */ if (*opv_desc_vector_p == NULL) { /* XXX - shouldn't be M_VNODE */ MALLOC(*opv_desc_vector_p, vop_t **, vfs_opv_numops * sizeof(vop_t *), M_VNODE, M_WAITOK); bzero(*opv_desc_vector_p, vfs_opv_numops * sizeof(vop_t *)); DODEBUG(printf("vector at %x allocated\n", opv_desc_vector_p)); } opv_desc_vector = *opv_desc_vector_p; for (j=0; them[i]->opv_desc_ops[j].opve_op; j++) { opve_descp = &(them[i]->opv_desc_ops[j]); /* * Sanity check: is this operation listed * in the list of operations? We check this * by seeing if its offest is zero. Since * the default routine should always be listed * first, it should be the only one with a zero * offset. Any other operation with a zero * offset is probably not listed in * vfs_op_descs, and so is probably an error. * * A panic here means the layer programmer * has committed the all-too common bug * of adding a new operation to the layer's * list of vnode operations but * not adding the operation to the system-wide * list of supported operations. */ if (opve_descp->opve_op->vdesc_offset == 0 && opve_descp->opve_op->vdesc_offset != VOFFSET(vop_default)) { printf("operation %s not listed in %s.\n", opve_descp->opve_op->vdesc_name, "vfs_op_descs"); panic ("vfs_opv_init: bad operation"); } /* * Fill in this entry. */ opv_desc_vector[opve_descp->opve_op->vdesc_offset] = opve_descp->opve_impl; } } /* * Finally, go back and replace unfilled routines * with their default. (Sigh, an O(n^3) algorithm. I * could make it better, but that'd be work, and n is small.) */ for (i = 0; them[i]; i++) { opv_desc_vector = *(them[i]->opv_desc_vector_p); /* * Force every operations vector to have a default routine. */ if (opv_desc_vector[VOFFSET(vop_default)]==NULL) { panic("vfs_opv_init: operation vector without default routine."); } for (k = 0; k<vfs_opv_numops; k++) if (opv_desc_vector[k] == NULL) opv_desc_vector[k] = opv_desc_vector[VOFFSET(vop_default)]; } } /* * Initialize known vnode operations vectors. */ static void vfs_op_init() { int i; DODEBUG(printf("Vnode_interface_init.\n")); DODEBUG(printf ("vfs_opv_numops=%d\n", vfs_opv_numops)); /* * Set all vnode vectors to a well known value. */ for (i = 0; vfs_opv_descs[i]; i++) *(vfs_opv_descs[i]->opv_desc_vector_p) = NULL; /* * assign each op to its offset * * XXX This should not be needed, but is because the per * XXX FS ops tables are not sorted according to the * XXX vnodeop_desc's offset in vfs_op_descs. This * XXX is the same reason we have to take the hit for * XXX the static inline function calls instead of using * XXX simple macro references. */ for (i = 0; i < vfs_opv_numops; i++) vfs_op_descs[i]->vdesc_offset = i; } /* * Routines having to do with the management of the vnode table. */ extern struct vnodeops dead_vnodeops; extern struct vnodeops spec_vnodeops; struct vattr va_null; /* * Initialize the vnode structures and initialize each file system type. */ /* ARGSUSED*/ static void vfsinit(dummy) void *dummy; { struct vfsconf **vfc; int maxtypenum; namei_zone = zinit("NAMEI", MAXPATHLEN, 0, 0, 2); /* * Initialize the vnode table */ vntblinit(); /* * Initialize the vnode name cache */ nchinit(); /* * Build vnode operation vectors. */ vfs_op_init(); vfs_opv_init(vfs_opv_descs); /* finish the job */ /* * Initialize each file system type. */ vattr_null(&va_null); maxtypenum = 0; vfc = (struct vfsconf **)vfs_set.ls_items; vfsconf = *vfc; /* simulate Lite2 vfsconf array */ while (*vfc) { struct vfsconf *vfsp = *vfc; vfc++; vfsp->vfc_next = *vfc; if (maxtypenum <= vfsp->vfc_typenum) maxtypenum = vfsp->vfc_typenum + 1; (*vfsp->vfc_vfsops->vfs_init)(vfsp); } /* next vfc_typenum to be used */ maxvfsconf = maxtypenum; }