vfs_init.c revision 12158
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 3912158Sbde * $Id: vfs_init.c,v 1.12 1995/09/09 18:10:16 davidg 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/time.h> 481541Srgrimes#include <sys/vnode.h> 491541Srgrimes#include <sys/stat.h> 501541Srgrimes#include <sys/namei.h> 511541Srgrimes#include <sys/ucred.h> 521541Srgrimes#include <sys/buf.h> 531541Srgrimes#include <sys/errno.h> 541541Srgrimes#include <sys/malloc.h> 552946Swollman#include <sys/proc.h> 562946Swollman#include <vm/vm.h> 572946Swollman#include <sys/sysctl.h> 581541Srgrimes 591541Srgrimes/* 6010358Sjulian * System initialization 6110358Sjulian */ 6210358Sjulian 6310653Sdgstatic void vfsinit __P((void *)); 6410358SjulianSYSINIT(vfs, SI_SUB_VFS, SI_ORDER_FIRST, vfsinit, NULL) 6510358Sjulian 6610358Sjulian/* 671541Srgrimes * Sigh, such primitive tools are these... 681541Srgrimes */ 691541Srgrimes#if 0 701541Srgrimes#define DODEBUG(A) A 711541Srgrimes#else 721541Srgrimes#define DODEBUG(A) 731541Srgrimes#endif 741541Srgrimes 752946Swollmanstruct vfsconf void_vfsconf; 762946Swollman 772946Swollmanextern struct linker_set vfs_opv_descs_; 782946Swollman#define vfs_opv_descs ((struct vnodeopv_desc **)vfs_opv_descs_.ls_items) 792946Swollman 802946Swollmanextern struct linker_set vfs_set; 812946Swollmanstruct vfsops *vfssw[MOUNT_MAXTYPE + 1]; 822946Swollmanstruct vfsconf *vfsconf[MOUNT_MAXTYPE + 1]; 832946Swollman 841541Srgrimesextern struct vnodeop_desc *vfs_op_descs[]; 851541Srgrimes /* and the operations they perform */ 861541Srgrimes/* 871541Srgrimes * This code doesn't work if the defn is **vnodop_defns with cc. 881541Srgrimes * The problem is because of the compiler sometimes putting in an 891541Srgrimes * extra level of indirection for arrays. It's an interesting 901541Srgrimes * "feature" of C. 911541Srgrimes */ 921541Srgrimesint vfs_opv_numops; 931541Srgrimes 941541Srgrimes/* 951541Srgrimes * A miscellaneous routine. 961541Srgrimes * A generic "default" routine that just returns an error. 971541Srgrimes */ 981541Srgrimesint 991541Srgrimesvn_default_error() 1001541Srgrimes{ 1011541Srgrimes 1021541Srgrimes return (EOPNOTSUPP); 1031541Srgrimes} 1041541Srgrimes 1051541Srgrimes/* 1061541Srgrimes * vfs_init.c 1071541Srgrimes * 1081541Srgrimes * Allocate and fill in operations vectors. 1091541Srgrimes * 1101541Srgrimes * An undocumented feature of this approach to defining operations is that 1111541Srgrimes * there can be multiple entries in vfs_opv_descs for the same operations 1121541Srgrimes * vector. This allows third parties to extend the set of operations 1131541Srgrimes * supported by another layer in a binary compatibile way. For example, 1141541Srgrimes * assume that NFS needed to be modified to support Ficus. NFS has an entry 1151541Srgrimes * (probably nfs_vnopdeop_decls) declaring all the operations NFS supports by 1161541Srgrimes * default. Ficus could add another entry (ficus_nfs_vnodeop_decl_entensions) 1171541Srgrimes * listing those new operations Ficus adds to NFS, all without modifying the 1181541Srgrimes * NFS code. (Of couse, the OTW NFS protocol still needs to be munged, but 1191541Srgrimes * that is a(whole)nother story.) This is a feature. 1201541Srgrimes */ 1211541Srgrimesvoid 1222946Swollmanvfs_opv_init(struct vnodeopv_desc **them) 1231541Srgrimes{ 1241541Srgrimes int i, j, k; 12512158Sbde vop_t ***opv_desc_vector_p; 12612158Sbde vop_t **opv_desc_vector; 1271541Srgrimes struct vnodeopv_entry_desc *opve_descp; 1281541Srgrimes 1291541Srgrimes /* 1301541Srgrimes * Allocate the dynamic vectors and fill them in. 1311541Srgrimes */ 1322946Swollman for (i=0; them[i]; i++) { 1332946Swollman opv_desc_vector_p = them[i]->opv_desc_vector_p; 1341541Srgrimes /* 1351541Srgrimes * Allocate and init the vector, if it needs it. 1361541Srgrimes * Also handle backwards compatibility. 1371541Srgrimes */ 1381541Srgrimes if (*opv_desc_vector_p == NULL) { 1391541Srgrimes /* XXX - shouldn't be M_VNODE */ 14012158Sbde MALLOC(*opv_desc_vector_p, vop_t **, 14112158Sbde vfs_opv_numops * sizeof(vop_t *), M_VNODE, 14212158Sbde M_WAITOK); 14312158Sbde bzero(*opv_desc_vector_p, 14412158Sbde vfs_opv_numops * sizeof(vop_t *)); 1451541Srgrimes DODEBUG(printf("vector at %x allocated\n", 1461541Srgrimes opv_desc_vector_p)); 1471541Srgrimes } 1481541Srgrimes opv_desc_vector = *opv_desc_vector_p; 1492946Swollman for (j=0; them[i]->opv_desc_ops[j].opve_op; j++) { 1502946Swollman opve_descp = &(them[i]->opv_desc_ops[j]); 1511541Srgrimes 1521541Srgrimes /* 1531541Srgrimes * Sanity check: is this operation listed 1541541Srgrimes * in the list of operations? We check this 1551541Srgrimes * by seeing if its offest is zero. Since 1561541Srgrimes * the default routine should always be listed 1571541Srgrimes * first, it should be the only one with a zero 1581541Srgrimes * offset. Any other operation with a zero 1591541Srgrimes * offset is probably not listed in 1601541Srgrimes * vfs_op_descs, and so is probably an error. 1611541Srgrimes * 1621541Srgrimes * A panic here means the layer programmer 1631541Srgrimes * has committed the all-too common bug 1641541Srgrimes * of adding a new operation to the layer's 1651541Srgrimes * list of vnode operations but 1661541Srgrimes * not adding the operation to the system-wide 1671541Srgrimes * list of supported operations. 1681541Srgrimes */ 1691541Srgrimes if (opve_descp->opve_op->vdesc_offset == 0 && 1701541Srgrimes opve_descp->opve_op->vdesc_offset != 1711541Srgrimes VOFFSET(vop_default)) { 1721541Srgrimes printf("operation %s not listed in %s.\n", 1731541Srgrimes opve_descp->opve_op->vdesc_name, 1741541Srgrimes "vfs_op_descs"); 1751541Srgrimes panic ("vfs_opv_init: bad operation"); 1761541Srgrimes } 1771541Srgrimes /* 1781541Srgrimes * Fill in this entry. 1791541Srgrimes */ 1801541Srgrimes opv_desc_vector[opve_descp->opve_op->vdesc_offset] = 1811541Srgrimes opve_descp->opve_impl; 1821541Srgrimes } 1831541Srgrimes } 1841541Srgrimes /* 1851541Srgrimes * Finally, go back and replace unfilled routines 1861541Srgrimes * with their default. (Sigh, an O(n^3) algorithm. I 1871541Srgrimes * could make it better, but that'd be work, and n is small.) 1881541Srgrimes */ 1892946Swollman for (i = 0; them[i]; i++) { 1902946Swollman opv_desc_vector = *(them[i]->opv_desc_vector_p); 1911541Srgrimes /* 1921541Srgrimes * Force every operations vector to have a default routine. 1931541Srgrimes */ 1941541Srgrimes if (opv_desc_vector[VOFFSET(vop_default)]==NULL) { 1951541Srgrimes panic("vfs_opv_init: operation vector without default routine."); 1961541Srgrimes } 1971541Srgrimes for (k = 0; k<vfs_opv_numops; k++) 1981541Srgrimes if (opv_desc_vector[k] == NULL) 1998876Srgrimes opv_desc_vector[k] = 2001541Srgrimes opv_desc_vector[VOFFSET(vop_default)]; 2011541Srgrimes } 2021541Srgrimes} 2031541Srgrimes 2041541Srgrimes/* 2051541Srgrimes * Initialize known vnode operations vectors. 2061541Srgrimes */ 2071541Srgrimesvoid 2081541Srgrimesvfs_op_init() 2091541Srgrimes{ 2101541Srgrimes int i; 2111541Srgrimes 2121541Srgrimes DODEBUG(printf("Vnode_interface_init.\n")); 2131541Srgrimes /* 2141541Srgrimes * Set all vnode vectors to a well known value. 2151541Srgrimes */ 2161541Srgrimes for (i = 0; vfs_opv_descs[i]; i++) 2171541Srgrimes *(vfs_opv_descs[i]->opv_desc_vector_p) = NULL; 2181541Srgrimes /* 2191541Srgrimes * Figure out how many ops there are by counting the table, 2201541Srgrimes * and assign each its offset. 2211541Srgrimes */ 2221541Srgrimes for (vfs_opv_numops = 0, i = 0; vfs_op_descs[i]; i++) { 2231541Srgrimes vfs_op_descs[i]->vdesc_offset = vfs_opv_numops; 2241541Srgrimes vfs_opv_numops++; 2251541Srgrimes } 2261541Srgrimes DODEBUG(printf ("vfs_opv_numops=%d\n", vfs_opv_numops)); 2271541Srgrimes} 2281541Srgrimes 2291541Srgrimes/* 2301541Srgrimes * Routines having to do with the management of the vnode table. 2311541Srgrimes */ 2321541Srgrimesextern struct vnodeops dead_vnodeops; 2331541Srgrimesextern struct vnodeops spec_vnodeops; 2341541Srgrimesextern void vclean(); 2351541Srgrimesstruct vattr va_null; 2361541Srgrimes 2371541Srgrimes/* 2381541Srgrimes * Initialize the vnode structures and initialize each file system type. 2391541Srgrimes */ 24010358Sjulian/* ARGSUSED*/ 24110358Sjulianstatic void 24210653Sdgvfsinit(udata) 24310653Sdg void *udata; /* not used*/ 2441541Srgrimes{ 2451541Srgrimes struct vfsops **vfsp; 2462946Swollman struct vfsconf **vfc; 2472946Swollman int i; 2481541Srgrimes 2491541Srgrimes /* 2502946Swollman * Initialize the VFS switch table 2512946Swollman */ 2522946Swollman for(i = 0; i < MOUNT_MAXTYPE + 1; i++) { 2532946Swollman vfsconf[i] = &void_vfsconf; 2542946Swollman } 2552946Swollman 2562946Swollman vfc = (struct vfsconf **)vfs_set.ls_items; 2572946Swollman while(*vfc) { 2582946Swollman vfssw[(**vfc).vfc_index] = (**vfc).vfc_vfsops; 2592946Swollman vfsconf[(**vfc).vfc_index] = *vfc; 2602946Swollman vfc++; 2612946Swollman } 2628876Srgrimes 2632946Swollman /* 2641541Srgrimes * Initialize the vnode table 2651541Srgrimes */ 2661541Srgrimes vntblinit(); 2671541Srgrimes /* 2681541Srgrimes * Initialize the vnode name cache 2691541Srgrimes */ 2701541Srgrimes nchinit(); 2711541Srgrimes /* 2721541Srgrimes * Build vnode operation vectors. 2731541Srgrimes */ 2741541Srgrimes vfs_op_init(); 2752946Swollman vfs_opv_init(vfs_opv_descs); /* finish the job */ 2761541Srgrimes /* 2771541Srgrimes * Initialize each file system type. 2781541Srgrimes */ 2791541Srgrimes vattr_null(&va_null); 2801541Srgrimes for (vfsp = &vfssw[0]; vfsp <= &vfssw[MOUNT_MAXTYPE]; vfsp++) { 2811541Srgrimes if (*vfsp == NULL) 2821541Srgrimes continue; 2831541Srgrimes (*(*vfsp)->vfs_init)(); 2841541Srgrimes } 2851541Srgrimes} 2862946Swollman 2872946Swollman/* 2882946Swollman * kernel related system variables. 2892946Swollman */ 2902946Swollmanint 2912946Swollmanfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 2922946Swollman int *name; 2932946Swollman u_int namelen; 2942946Swollman void *oldp; 2952946Swollman size_t *oldlenp; 2962946Swollman void *newp; 2972946Swollman size_t newlen; 2982946Swollman struct proc *p; 2992946Swollman{ 3002946Swollman int i; 3012946Swollman int error; 3022946Swollman int buflen = *oldlenp; 3032962Swollman caddr_t where = oldp, start = oldp; 3042946Swollman 3052946Swollman switch (name[0]) { 3062946Swollman case FS_VFSCONF: 3072946Swollman if (namelen != 1) return ENOTDIR; 3082946Swollman 3092946Swollman if (oldp == NULL) { 3102946Swollman *oldlenp = (MOUNT_MAXTYPE+1) * sizeof(struct vfsconf); 3112946Swollman return 0; 3122946Swollman } 3132946Swollman if (newp) { 3142946Swollman return EINVAL; 3152946Swollman } 3162946Swollman 3172946Swollman for(i = 0; i < MOUNT_MAXTYPE + 1; i++) { 3182946Swollman if(buflen < sizeof *vfsconf[i]) { 3192946Swollman *oldlenp = where - start; 3202946Swollman return ENOMEM; 3212946Swollman } 3222946Swollman 3233441Sphk error = copyout(vfsconf[i], where, sizeof *vfsconf[i]); 3243441Sphk if(error) 3252946Swollman return error; 3262946Swollman where += sizeof *vfsconf[i]; 3272946Swollman buflen -= sizeof *vfsconf[i]; 3282946Swollman } 3292946Swollman *oldlenp = where - start; 3302946Swollman return 0; 3318876Srgrimes 3322946Swollman default: 3333731Swollman if(namelen < 1) return EINVAL; 3343731Swollman 3353731Swollman i = name[0]; 3363731Swollman 3373731Swollman if(i <= MOUNT_MAXTYPE 3383731Swollman && vfssw[i] 3393731Swollman && vfssw[i]->vfs_sysctl) { 3403731Swollman return vfssw[i]->vfs_sysctl(name + 1, namelen - 1, 3413731Swollman oldp, oldlenp, 3423731Swollman newp, newlen, p); 3433731Swollman } 3443731Swollman 3452946Swollman return (EOPNOTSUPP); 3462946Swollman } 3472946Swollman /* NOTREACHED */ 3482946Swollman} 3492946Swollman 3502997Swollman/* 3512997Swollman * This goop is here to support a loadable NFS module... grumble... 3522997Swollman */ 3532997Swollmanvoid (*lease_check) __P((struct vnode *, struct proc *, struct ucred *, int)) 3542997Swollman = 0; 3552997Swollmanvoid (*lease_updatetime) __P((int)) 3562997Swollman = 0; 3572997Swollman 358