vfs_init.c revision 8876
11573Srgrimes/* 21573Srgrimes * Copyright (c) 1989, 1993 31573Srgrimes * The Regents of the University of California. All rights reserved. 41573Srgrimes * 51573Srgrimes * This code is derived from software contributed 61573Srgrimes * to Berkeley by John Heidemann of the UCLA Ficus project. 71573Srgrimes * 81573Srgrimes * Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project 91573Srgrimes * 101573Srgrimes * Redistribution and use in source and binary forms, with or without 111573Srgrimes * modification, are permitted provided that the following conditions 121573Srgrimes * are met: 131573Srgrimes * 1. Redistributions of source code must retain the above copyright 141573Srgrimes * notice, this list of conditions and the following disclaimer. 151573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 161573Srgrimes * notice, this list of conditions and the following disclaimer in the 171573Srgrimes * documentation and/or other materials provided with the distribution. 181573Srgrimes * 3. All advertising materials mentioning features or use of this software 191573Srgrimes * must display the following acknowledgement: 201573Srgrimes * This product includes software developed by the University of 211573Srgrimes * California, Berkeley and its contributors. 221573Srgrimes * 4. Neither the name of the University nor the names of its contributors 231573Srgrimes * may be used to endorse or promote products derived from this software 241573Srgrimes * without specific prior written permission. 251573Srgrimes * 261573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 271573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 281573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 291573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 301573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 311573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 321573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3350476Speter * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 341573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35171195Sscf * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 361573Srgrimes * SUCH DAMAGE. 371573Srgrimes * 381573Srgrimes * @(#)vfs_init.c 8.3 (Berkeley) 1/4/94 391573Srgrimes * $Id: vfs_init.c,v 1.9 1994/10/20 00:48:28 wollman Exp $ 401573Srgrimes */ 411573Srgrimes 421573Srgrimes 431573Srgrimes#include <sys/param.h> 4459460Sphantom#include <sys/systm.h> 4559460Sphantom#include <sys/kernel.h> 461573Srgrimes#include <sys/mount.h> 4783206Sasmodai#include <sys/time.h> 481573Srgrimes#include <sys/vnode.h> 491573Srgrimes#include <sys/stat.h> 501573Srgrimes#include <sys/namei.h> 511573Srgrimes#include <sys/ucred.h> 521573Srgrimes#include <sys/buf.h> 53171195Sscf#include <sys/errno.h> 54171195Sscf#include <sys/malloc.h> 551573Srgrimes#include <sys/proc.h> 561573Srgrimes#include <vm/vm.h> 571573Srgrimes#include <sys/sysctl.h> 581573Srgrimes 591573Srgrimes/* 601573Srgrimes * Sigh, such primitive tools are these... 611573Srgrimes */ 621573Srgrimes#if 0 631573Srgrimes#define DODEBUG(A) A 64108040Sru#else 65163262Strhodes#define DODEBUG(A) 66163262Strhodes#endif 67163262Strhodes 68163262Strhodesstruct vfsconf void_vfsconf; 691573Srgrimes 701573Srgrimesextern struct linker_set vfs_opv_descs_; 711573Srgrimes#define vfs_opv_descs ((struct vnodeopv_desc **)vfs_opv_descs_.ls_items) 721573Srgrimes 73108040Sruextern struct linker_set vfs_set; 741573Srgrimesstruct vfsops *vfssw[MOUNT_MAXTYPE + 1]; 751573Srgrimesstruct vfsconf *vfsconf[MOUNT_MAXTYPE + 1]; 76108040Sru 771573Srgrimesextern struct vnodeop_desc *vfs_op_descs[]; 781573Srgrimes /* and the operations they perform */ 79108040Sru/* 801573Srgrimes * This code doesn't work if the defn is **vnodop_defns with cc. 81108040Sru * The problem is because of the compiler sometimes putting in an 821573Srgrimes * extra level of indirection for arrays. It's an interesting 83108040Sru * "feature" of C. 84163108Strhodes */ 851573Srgrimesint vfs_opv_numops; 861573Srgrimes 87108040Srutypedef int (*PFI)(); /* the standard Pointer to a Function returning an Int */ 881573Srgrimes 891573Srgrimes/* 901573Srgrimes * A miscellaneous routine. 91171195Sscf * A generic "default" routine that just returns an error. 92171195Sscf */ 93171195Sscfint 94171195Sscfvn_default_error() 95171195Sscf{ 96171195Sscf 97171195Sscf return (EOPNOTSUPP); 98171195Sscf} 99171195Sscf 100171195Sscf/* 101171195Sscf * vfs_init.c 102171195Sscf * 1031573Srgrimes * Allocate and fill in operations vectors. 1041573Srgrimes * 1051573Srgrimes * An undocumented feature of this approach to defining operations is that 1061573Srgrimes * there can be multiple entries in vfs_opv_descs for the same operations 1071573Srgrimes * vector. This allows third parties to extend the set of operations 1081573Srgrimes * supported by another layer in a binary compatibile way. For example, 1091573Srgrimes * assume that NFS needed to be modified to support Ficus. NFS has an entry 110200195Sscf * (probably nfs_vnopdeop_decls) declaring all the operations NFS supports by 111200195Sscf * default. Ficus could add another entry (ficus_nfs_vnodeop_decl_entensions) 112200195Sscf * listing those new operations Ficus adds to NFS, all without modifying the 113200195Sscf * NFS code. (Of couse, the OTW NFS protocol still needs to be munged, but 114200195Sscf * that is a(whole)nother story.) This is a feature. 115200195Sscf */ 116200195Sscfvoid 117200195Sscfvfs_opv_init(struct vnodeopv_desc **them) 118200195Sscf{ 1191573Srgrimes int i, j, k; 120131728Shmp int (***opv_desc_vector_p)(); 121131728Shmp int (**opv_desc_vector)(); 122131754Sru struct vnodeopv_entry_desc *opve_descp; 123131754Sru 124131754Sru /* 125131728Shmp * Allocate the dynamic vectors and fill them in. 126131728Shmp */ 127131728Shmp for (i=0; them[i]; i++) { 128131728Shmp opv_desc_vector_p = them[i]->opv_desc_vector_p; 129131728Shmp /* 130131728Shmp * Allocate and init the vector, if it needs it. 131171195Sscf * Also handle backwards compatibility. 1321573Srgrimes */ 13360075Sphantom if (*opv_desc_vector_p == NULL) { 134171195Sscf /* XXX - shouldn't be M_VNODE */ 1351573Srgrimes MALLOC(*opv_desc_vector_p, PFI*, 136171195Sscf vfs_opv_numops*sizeof(PFI), M_VNODE, M_WAITOK); 1371573Srgrimes bzero (*opv_desc_vector_p, vfs_opv_numops*sizeof(PFI)); 1381573Srgrimes DODEBUG(printf("vector at %x allocated\n", 139171195Sscf opv_desc_vector_p)); 140171195Sscf } 141171195Sscf opv_desc_vector = *opv_desc_vector_p; 142171195Sscf for (j=0; them[i]->opv_desc_ops[j].opve_op; j++) { 143171195Sscf opve_descp = &(them[i]->opv_desc_ops[j]); 144171195Sscf 145171195Sscf /* 146171195Sscf * Sanity check: is this operation listed 147171195Sscf * in the list of operations? We check this 148171195Sscf * by seeing if its offest is zero. Since 1491573Srgrimes * the default routine should always be listed 150171195Sscf * first, it should be the only one with a zero 151171195Sscf * offset. Any other operation with a zero 152171195Sscf * offset is probably not listed in 153171195Sscf * vfs_op_descs, and so is probably an error. 154171195Sscf * 155235575Sgjb * A panic here means the layer programmer 156235575Sgjb * has committed the all-too common bug 157171195Sscf * of adding a new operation to the layer's 158171195Sscf * list of vnode operations but 159171195Sscf * not adding the operation to the system-wide 160171195Sscf * list of supported operations. 161171195Sscf */ 162171195Sscf if (opve_descp->opve_op->vdesc_offset == 0 && 163171195Sscf opve_descp->opve_op->vdesc_offset != 164171195Sscf VOFFSET(vop_default)) { 165171195Sscf printf("operation %s not listed in %s.\n", 166171195Sscf opve_descp->opve_op->vdesc_name, 167171195Sscf "vfs_op_descs"); 168171195Sscf panic ("vfs_opv_init: bad operation"); 169171195Sscf } 170171195Sscf /* 1711573Srgrimes * Fill in this entry. 1721573Srgrimes */ 1731573Srgrimes opv_desc_vector[opve_descp->opve_op->vdesc_offset] = 1741573Srgrimes opve_descp->opve_impl; 1751573Srgrimes } 1761573Srgrimes } 1771573Srgrimes /* 1781573Srgrimes * Finally, go back and replace unfilled routines 1791573Srgrimes * with their default. (Sigh, an O(n^3) algorithm. I 1801573Srgrimes * could make it better, but that'd be work, and n is small.) 1811573Srgrimes */ 18273088Sru for (i = 0; them[i]; i++) { 183171195Sscf opv_desc_vector = *(them[i]->opv_desc_vector_p); 184171195Sscf /* 185171195Sscf * Force every operations vector to have a default routine. 186171195Sscf */ 187171195Sscf if (opv_desc_vector[VOFFSET(vop_default)]==NULL) { 188171195Sscf panic("vfs_opv_init: operation vector without default routine."); 189171195Sscf } 190140505Sru for (k = 0; k<vfs_opv_numops; k++) 191140505Sru if (opv_desc_vector[k] == NULL) 192140505Sru opv_desc_vector[k] = 193140505Sru opv_desc_vector[VOFFSET(vop_default)]; 194140505Sru } 195140505Sru} 196140505Sru 197140505Sru/* 198140505Sru * Initialize known vnode operations vectors. 199140505Sru */ 200140505Sruvoid 201171195Sscfvfs_op_init() 202171195Sscf{ 203171195Sscf int i; 204171195Sscf 205237216Seadler DODEBUG(printf("Vnode_interface_init.\n")); 206171195Sscf /* 207171195Sscf * Set all vnode vectors to a well known value. 208171195Sscf */ 209171195Sscf for (i = 0; vfs_opv_descs[i]; i++) 210171195Sscf *(vfs_opv_descs[i]->opv_desc_vector_p) = NULL; 211171195Sscf /* 212171195Sscf * Figure out how many ops there are by counting the table, 213171195Sscf * and assign each its offset. 21456652Sarchie */ 21556652Sarchie for (vfs_opv_numops = 0, i = 0; vfs_op_descs[i]; i++) { 21656652Sarchie vfs_op_descs[i]->vdesc_offset = vfs_opv_numops; 217171195Sscf vfs_opv_numops++; 218108040Sru } 219171195Sscf DODEBUG(printf ("vfs_opv_numops=%d\n", vfs_opv_numops)); 220108040Sru} 221131504Sru 222131504Sru/* 22368716Sru * Routines having to do with the management of the vnode table. 224171195Sscf */ 22556652Sarchieextern struct vnodeops dead_vnodeops; 226108040Sruextern struct vnodeops spec_vnodeops; 22756652Sarchieextern void vclean(); 228131504Srustruct vattr va_null; 229131504Sru 23056652Sarchie/* 231 * Initialize the vnode structures and initialize each file system type. 232 */ 233void 234vfsinit() 235{ 236 struct vfsops **vfsp; 237 struct vfsconf **vfc; 238 int i; 239 240 /* 241 * Initialize the VFS switch table 242 */ 243 for(i = 0; i < MOUNT_MAXTYPE + 1; i++) { 244 vfsconf[i] = &void_vfsconf; 245 } 246 247 vfc = (struct vfsconf **)vfs_set.ls_items; 248 while(*vfc) { 249 vfssw[(**vfc).vfc_index] = (**vfc).vfc_vfsops; 250 vfsconf[(**vfc).vfc_index] = *vfc; 251 vfc++; 252 } 253 254 /* 255 * Initialize the vnode table 256 */ 257 vntblinit(); 258 /* 259 * Initialize the vnode name cache 260 */ 261 nchinit(); 262 /* 263 * Build vnode operation vectors. 264 */ 265 vfs_op_init(); 266 vfs_opv_init(vfs_opv_descs); /* finish the job */ 267 /* 268 * Initialize each file system type. 269 */ 270 vattr_null(&va_null); 271 for (vfsp = &vfssw[0]; vfsp <= &vfssw[MOUNT_MAXTYPE]; vfsp++) { 272 if (*vfsp == NULL) 273 continue; 274 (*(*vfsp)->vfs_init)(); 275 } 276} 277 278/* 279 * kernel related system variables. 280 */ 281int 282fs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 283 int *name; 284 u_int namelen; 285 void *oldp; 286 size_t *oldlenp; 287 void *newp; 288 size_t newlen; 289 struct proc *p; 290{ 291 int i; 292 int error; 293 int buflen = *oldlenp; 294 caddr_t where = oldp, start = oldp; 295 296 switch (name[0]) { 297 case FS_VFSCONF: 298 if (namelen != 1) return ENOTDIR; 299 300 if (oldp == NULL) { 301 *oldlenp = (MOUNT_MAXTYPE+1) * sizeof(struct vfsconf); 302 return 0; 303 } 304 if (newp) { 305 return EINVAL; 306 } 307 308 for(i = 0; i < MOUNT_MAXTYPE + 1; i++) { 309 if(buflen < sizeof *vfsconf[i]) { 310 *oldlenp = where - start; 311 return ENOMEM; 312 } 313 314 error = copyout(vfsconf[i], where, sizeof *vfsconf[i]); 315 if(error) 316 return error; 317 where += sizeof *vfsconf[i]; 318 buflen -= sizeof *vfsconf[i]; 319 } 320 *oldlenp = where - start; 321 return 0; 322 323 default: 324 if(namelen < 1) return EINVAL; 325 326 i = name[0]; 327 328 if(i <= MOUNT_MAXTYPE 329 && vfssw[i] 330 && vfssw[i]->vfs_sysctl) { 331 return vfssw[i]->vfs_sysctl(name + 1, namelen - 1, 332 oldp, oldlenp, 333 newp, newlen, p); 334 } 335 336 return (EOPNOTSUPP); 337 } 338 /* NOTREACHED */ 339} 340 341/* 342 * This goop is here to support a loadable NFS module... grumble... 343 */ 344void (*lease_check) __P((struct vnode *, struct proc *, struct ucred *, int)) 345 = 0; 346void (*lease_updatetime) __P((int)) 347 = 0; 348 349