vfs_init.c revision 33181
11541Srgrimes/* 21541Srgrimes * Copyright (c) 1989, 1993 31541Srgrimes * The Regents of the University of California. All rights reserved. 41541Srgrimes * 51541Srgrimes * This code is derived from software contributed 61541Srgrimes * to Berkeley by John Heidemann of the UCLA Ficus project. 71541Srgrimes * 81541Srgrimes * Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project 91541Srgrimes * 101541Srgrimes * Redistribution and use in source and binary forms, with or without 111541Srgrimes * modification, are permitted provided that the following conditions 121541Srgrimes * are met: 131541Srgrimes * 1. Redistributions of source code must retain the above copyright 141541Srgrimes * notice, this list of conditions and the following disclaimer. 151541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 161541Srgrimes * notice, this list of conditions and the following disclaimer in the 171541Srgrimes * documentation and/or other materials provided with the distribution. 181541Srgrimes * 3. All advertising materials mentioning features or use of this software 191541Srgrimes * must display the following acknowledgement: 201541Srgrimes * This product includes software developed by the University of 211541Srgrimes * California, Berkeley and its contributors. 221541Srgrimes * 4. Neither the name of the University nor the names of its contributors 231541Srgrimes * may be used to endorse or promote products derived from this software 241541Srgrimes * without specific prior written permission. 251541Srgrimes * 261541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 271541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 281541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 291541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 301541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 311541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 321541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 331541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 341541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 351541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 361541Srgrimes * SUCH DAMAGE. 371541Srgrimes * 381541Srgrimes * @(#)vfs_init.c 8.3 (Berkeley) 1/4/94 3933181Seivind * $Id: vfs_init.c,v 1.31 1997/10/26 20:26:33 phk Exp $ 401541Srgrimes */ 411541Srgrimes 421541Srgrimes 431541Srgrimes#include <sys/param.h> 442112Swollman#include <sys/systm.h> 452946Swollman#include <sys/kernel.h> 461541Srgrimes#include <sys/mount.h> 471541Srgrimes#include <sys/vnode.h> 481541Srgrimes#include <sys/malloc.h> 4929653Sdyson#include <vm/vm_zone.h> 501541Srgrimes 5112913Sphkstatic void vfs_op_init __P((void)); 5212577Sbde 5310653Sdgstatic void vfsinit __P((void *)); 5410358SjulianSYSINIT(vfs, SI_SUB_VFS, SI_ORDER_FIRST, vfsinit, NULL) 5510358Sjulian 5630354SphkMALLOC_DEFINE(M_VNODE, "vnodes", "Dynamically allocated vnodes"); 5730354Sphk 5810358Sjulian/* 591541Srgrimes * Sigh, such primitive tools are these... 601541Srgrimes */ 611541Srgrimes#if 0 621541Srgrimes#define DODEBUG(A) A 631541Srgrimes#else 641541Srgrimes#define DODEBUG(A) 651541Srgrimes#endif 661541Srgrimes 6733181Seivindstatic struct vfsconf void_vfsconf; 682946Swollman 692946Swollmanextern struct linker_set vfs_opv_descs_; 702946Swollman#define vfs_opv_descs ((struct vnodeopv_desc **)vfs_opv_descs_.ls_items) 712946Swollman 722946Swollmanextern struct linker_set vfs_set; 732946Swollman 741541Srgrimesextern struct vnodeop_desc *vfs_op_descs[]; 751541Srgrimes /* and the operations they perform */ 761541Srgrimes 771541Srgrimes/* 7829653Sdyson * Zone for namei 7929653Sdyson */ 8029653Sdysonstruct vm_zone *namei_zone; 8129653Sdyson 8229653Sdyson/* 831541Srgrimes * vfs_init.c 841541Srgrimes * 851541Srgrimes * Allocate and fill in operations vectors. 861541Srgrimes * 871541Srgrimes * An undocumented feature of this approach to defining operations is that 881541Srgrimes * there can be multiple entries in vfs_opv_descs for the same operations 891541Srgrimes * vector. This allows third parties to extend the set of operations 901541Srgrimes * supported by another layer in a binary compatibile way. For example, 911541Srgrimes * assume that NFS needed to be modified to support Ficus. NFS has an entry 921541Srgrimes * (probably nfs_vnopdeop_decls) declaring all the operations NFS supports by 931541Srgrimes * default. Ficus could add another entry (ficus_nfs_vnodeop_decl_entensions) 941541Srgrimes * listing those new operations Ficus adds to NFS, all without modifying the 951541Srgrimes * NFS code. (Of couse, the OTW NFS protocol still needs to be munged, but 961541Srgrimes * that is a(whole)nother story.) This is a feature. 9729290Sphk * 9829290Sphk * Without an explicit reserve area, however, you must replace vnode_if.c 9929290Sphk * and vnode_if.h when you do this, or you will be derefrencing of the 10029290Sphk * end of vfs_op_descs[]. This is a flaw in the use of a structure 10129290Sphk * pointer array rather than an agregate to define vfs_op_descs. So 10229290Sphk * it's not a very dynamic "feature". 1031541Srgrimes */ 1041541Srgrimesvoid 1052946Swollmanvfs_opv_init(struct vnodeopv_desc **them) 1061541Srgrimes{ 1071541Srgrimes int i, j, k; 10812158Sbde vop_t ***opv_desc_vector_p; 10912158Sbde vop_t **opv_desc_vector; 1101541Srgrimes struct vnodeopv_entry_desc *opve_descp; 1111541Srgrimes 1121541Srgrimes /* 1131541Srgrimes * Allocate the dynamic vectors and fill them in. 1141541Srgrimes */ 1152946Swollman for (i=0; them[i]; i++) { 1162946Swollman opv_desc_vector_p = them[i]->opv_desc_vector_p; 1171541Srgrimes /* 1181541Srgrimes * Allocate and init the vector, if it needs it. 1191541Srgrimes * Also handle backwards compatibility. 1201541Srgrimes */ 1211541Srgrimes if (*opv_desc_vector_p == NULL) { 1221541Srgrimes /* XXX - shouldn't be M_VNODE */ 12312158Sbde MALLOC(*opv_desc_vector_p, vop_t **, 12412158Sbde vfs_opv_numops * sizeof(vop_t *), M_VNODE, 12512158Sbde M_WAITOK); 12612158Sbde bzero(*opv_desc_vector_p, 12712158Sbde vfs_opv_numops * sizeof(vop_t *)); 1281541Srgrimes DODEBUG(printf("vector at %x allocated\n", 1291541Srgrimes opv_desc_vector_p)); 1301541Srgrimes } 1311541Srgrimes opv_desc_vector = *opv_desc_vector_p; 1322946Swollman for (j=0; them[i]->opv_desc_ops[j].opve_op; j++) { 1332946Swollman opve_descp = &(them[i]->opv_desc_ops[j]); 1341541Srgrimes 1351541Srgrimes /* 1361541Srgrimes * Sanity check: is this operation listed 1371541Srgrimes * in the list of operations? We check this 1381541Srgrimes * by seeing if its offest is zero. Since 1391541Srgrimes * the default routine should always be listed 1401541Srgrimes * first, it should be the only one with a zero 1411541Srgrimes * offset. Any other operation with a zero 1421541Srgrimes * offset is probably not listed in 1431541Srgrimes * vfs_op_descs, and so is probably an error. 1441541Srgrimes * 1451541Srgrimes * A panic here means the layer programmer 1461541Srgrimes * has committed the all-too common bug 1471541Srgrimes * of adding a new operation to the layer's 1481541Srgrimes * list of vnode operations but 1491541Srgrimes * not adding the operation to the system-wide 1501541Srgrimes * list of supported operations. 1511541Srgrimes */ 1521541Srgrimes if (opve_descp->opve_op->vdesc_offset == 0 && 1531541Srgrimes opve_descp->opve_op->vdesc_offset != 1541541Srgrimes VOFFSET(vop_default)) { 1551541Srgrimes printf("operation %s not listed in %s.\n", 1561541Srgrimes opve_descp->opve_op->vdesc_name, 1571541Srgrimes "vfs_op_descs"); 1581541Srgrimes panic ("vfs_opv_init: bad operation"); 1591541Srgrimes } 1601541Srgrimes /* 1611541Srgrimes * Fill in this entry. 1621541Srgrimes */ 1631541Srgrimes opv_desc_vector[opve_descp->opve_op->vdesc_offset] = 1641541Srgrimes opve_descp->opve_impl; 1651541Srgrimes } 1661541Srgrimes } 1671541Srgrimes /* 1681541Srgrimes * Finally, go back and replace unfilled routines 1691541Srgrimes * with their default. (Sigh, an O(n^3) algorithm. I 1701541Srgrimes * could make it better, but that'd be work, and n is small.) 1711541Srgrimes */ 1722946Swollman for (i = 0; them[i]; i++) { 1732946Swollman opv_desc_vector = *(them[i]->opv_desc_vector_p); 1741541Srgrimes /* 1751541Srgrimes * Force every operations vector to have a default routine. 1761541Srgrimes */ 1771541Srgrimes if (opv_desc_vector[VOFFSET(vop_default)]==NULL) { 1781541Srgrimes panic("vfs_opv_init: operation vector without default routine."); 1791541Srgrimes } 1801541Srgrimes for (k = 0; k<vfs_opv_numops; k++) 1811541Srgrimes if (opv_desc_vector[k] == NULL) 1828876Srgrimes opv_desc_vector[k] = 1831541Srgrimes opv_desc_vector[VOFFSET(vop_default)]; 1841541Srgrimes } 1851541Srgrimes} 1861541Srgrimes 1871541Srgrimes/* 1881541Srgrimes * Initialize known vnode operations vectors. 1891541Srgrimes */ 19012913Sphkstatic void 1911541Srgrimesvfs_op_init() 1921541Srgrimes{ 1931541Srgrimes int i; 1941541Srgrimes 1951541Srgrimes DODEBUG(printf("Vnode_interface_init.\n")); 19629290Sphk DODEBUG(printf ("vfs_opv_numops=%d\n", vfs_opv_numops)); 1971541Srgrimes /* 1981541Srgrimes * Set all vnode vectors to a well known value. 1991541Srgrimes */ 2001541Srgrimes for (i = 0; vfs_opv_descs[i]; i++) 2011541Srgrimes *(vfs_opv_descs[i]->opv_desc_vector_p) = NULL; 2021541Srgrimes /* 20329290Sphk * assign each op to its offset 20429290Sphk * 20529290Sphk * XXX This should not be needed, but is because the per 20629290Sphk * XXX FS ops tables are not sorted according to the 20729290Sphk * XXX vnodeop_desc's offset in vfs_op_descs. This 20829290Sphk * XXX is the same reason we have to take the hit for 20929290Sphk * XXX the static inline function calls instead of using 21029290Sphk * XXX simple macro references. 2111541Srgrimes */ 21229290Sphk for (i = 0; i < vfs_opv_numops; i++) 21329290Sphk vfs_op_descs[i]->vdesc_offset = i; 2141541Srgrimes} 2151541Srgrimes 2161541Srgrimes/* 2171541Srgrimes * Routines having to do with the management of the vnode table. 2181541Srgrimes */ 2191541Srgrimesextern struct vnodeops dead_vnodeops; 2201541Srgrimesextern struct vnodeops spec_vnodeops; 2211541Srgrimesstruct vattr va_null; 2221541Srgrimes 2231541Srgrimes/* 2241541Srgrimes * Initialize the vnode structures and initialize each file system type. 2251541Srgrimes */ 22610358Sjulian/* ARGSUSED*/ 22710358Sjulianstatic void 22812569Sbdevfsinit(dummy) 22912569Sbde void *dummy; 2301541Srgrimes{ 2312946Swollman struct vfsconf **vfc; 23222521Sdyson int maxtypenum; 2331541Srgrimes 23429653Sdyson namei_zone = zinit("NAMEI", MAXPATHLEN, 0, 0, 2); 23529653Sdyson 2361541Srgrimes /* 2371541Srgrimes * Initialize the vnode table 2381541Srgrimes */ 2391541Srgrimes vntblinit(); 2401541Srgrimes /* 2411541Srgrimes * Initialize the vnode name cache 2421541Srgrimes */ 2431541Srgrimes nchinit(); 2441541Srgrimes /* 2451541Srgrimes * Build vnode operation vectors. 2461541Srgrimes */ 2471541Srgrimes vfs_op_init(); 2482946Swollman vfs_opv_init(vfs_opv_descs); /* finish the job */ 2491541Srgrimes /* 2501541Srgrimes * Initialize each file system type. 2511541Srgrimes */ 2521541Srgrimes vattr_null(&va_null); 25322521Sdyson maxtypenum = 0; 25422521Sdyson vfc = (struct vfsconf **)vfs_set.ls_items; 25522521Sdyson vfsconf = *vfc; /* simulate Lite2 vfsconf array */ 25622521Sdyson while (*vfc) { 25722521Sdyson struct vfsconf *vfsp = *vfc; 25822521Sdyson 25922521Sdyson vfc++; 26022521Sdyson vfsp->vfc_next = *vfc; 26122521Sdyson if (maxtypenum <= vfsp->vfc_typenum) 26222521Sdyson maxtypenum = vfsp->vfc_typenum + 1; 26322521Sdyson (*vfsp->vfc_vfsops->vfs_init)(vfsp); 2641541Srgrimes } 26522521Sdyson /* next vfc_typenum to be used */ 26622521Sdyson maxvfsconf = maxtypenum; 2671541Srgrimes} 2682946Swollman 269