vfs_init.c revision 22521
1201062Sluigi/* 2201062Sluigi * Copyright (c) 1989, 1993 3201062Sluigi * The Regents of the University of California. All rights reserved. 4201062Sluigi * 5201062Sluigi * This code is derived from software contributed 6201076Sluigi * to Berkeley by John Heidemann of the UCLA Ficus project. 7201076Sluigi * 8201076Sluigi * Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project 9201076Sluigi * 10201076Sluigi * Redistribution and use in source and binary forms, with or without 11201076Sluigi * modification, are permitted provided that the following conditions 12201076Sluigi * are met: 13201076Sluigi * 1. Redistributions of source code must retain the above copyright 14201076Sluigi * notice, this list of conditions and the following disclaimer. 15201076Sluigi * 2. Redistributions in binary form must reproduce the above copyright 16201076Sluigi * notice, this list of conditions and the following disclaimer in the 17201076Sluigi * documentation and/or other materials provided with the distribution. 18201076Sluigi * 3. All advertising materials mentioning features or use of this software 19201076Sluigi * must display the following acknowledgement: 20201076Sluigi * This product includes software developed by the University of 21201076Sluigi * California, Berkeley and its contributors. 22201076Sluigi * 4. Neither the name of the University nor the names of its contributors 23201076Sluigi * may be used to endorse or promote products derived from this software 24201076Sluigi * without specific prior written permission. 25201076Sluigi * 26201076Sluigi * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)vfs_init.c 8.3 (Berkeley) 1/4/94 39 * $FreeBSD: head/sys/kern/vfs_init.c 22521 1997-02-10 02:22:35Z dyson $ 40 */ 41 42 43#include <sys/param.h> 44#include <sys/systm.h> 45#include <sys/kernel.h> 46#include <sys/mount.h> 47#include <sys/time.h> 48#include <sys/vnode.h> 49#include <sys/stat.h> 50#include <sys/namei.h> 51#include <sys/ucred.h> 52#include <sys/buf.h> 53#include <sys/errno.h> 54#include <sys/malloc.h> 55#include <sys/proc.h> 56#include <vm/vm.h> 57#include <sys/sysctl.h> 58 59static void vfs_op_init __P((void)); 60 61static void vfsinit __P((void *)); 62SYSINIT(vfs, SI_SUB_VFS, SI_ORDER_FIRST, vfsinit, NULL) 63 64/* 65 * Sigh, such primitive tools are these... 66 */ 67#if 0 68#define DODEBUG(A) A 69#else 70#define DODEBUG(A) 71#endif 72 73struct vfsconf void_vfsconf; 74 75extern struct linker_set vfs_opv_descs_; 76#define vfs_opv_descs ((struct vnodeopv_desc **)vfs_opv_descs_.ls_items) 77 78extern struct linker_set vfs_set; 79 80extern struct vnodeop_desc *vfs_op_descs[]; 81 /* and the operations they perform */ 82/* 83 * This code doesn't work if the defn is **vnodop_defns with cc. 84 * The problem is because of the compiler sometimes putting in an 85 * extra level of indirection for arrays. It's an interesting 86 * "feature" of C. 87 */ 88static int vfs_opv_numops; 89 90/* 91 * A miscellaneous routine. 92 * A generic "default" routine that just returns an error. 93 */ 94int 95vn_default_error() 96{ 97 98 return (EOPNOTSUPP); 99} 100 101/* 102 * vfs_init.c 103 * 104 * Allocate and fill in operations vectors. 105 * 106 * An undocumented feature of this approach to defining operations is that 107 * there can be multiple entries in vfs_opv_descs for the same operations 108 * vector. This allows third parties to extend the set of operations 109 * supported by another layer in a binary compatibile way. For example, 110 * assume that NFS needed to be modified to support Ficus. NFS has an entry 111 * (probably nfs_vnopdeop_decls) declaring all the operations NFS supports by 112 * default. Ficus could add another entry (ficus_nfs_vnodeop_decl_entensions) 113 * listing those new operations Ficus adds to NFS, all without modifying the 114 * NFS code. (Of couse, the OTW NFS protocol still needs to be munged, but 115 * that is a(whole)nother story.) This is a feature. 116 */ 117void 118vfs_opv_init(struct vnodeopv_desc **them) 119{ 120 int i, j, k; 121 vop_t ***opv_desc_vector_p; 122 vop_t **opv_desc_vector; 123 struct vnodeopv_entry_desc *opve_descp; 124 125 /* 126 * Allocate the dynamic vectors and fill them in. 127 */ 128 for (i=0; them[i]; i++) { 129 opv_desc_vector_p = them[i]->opv_desc_vector_p; 130 /* 131 * Allocate and init the vector, if it needs it. 132 * Also handle backwards compatibility. 133 */ 134 if (*opv_desc_vector_p == NULL) { 135 /* XXX - shouldn't be M_VNODE */ 136 MALLOC(*opv_desc_vector_p, vop_t **, 137 vfs_opv_numops * sizeof(vop_t *), M_VNODE, 138 M_WAITOK); 139 bzero(*opv_desc_vector_p, 140 vfs_opv_numops * sizeof(vop_t *)); 141 DODEBUG(printf("vector at %x allocated\n", 142 opv_desc_vector_p)); 143 } 144 opv_desc_vector = *opv_desc_vector_p; 145 for (j=0; them[i]->opv_desc_ops[j].opve_op; j++) { 146 opve_descp = &(them[i]->opv_desc_ops[j]); 147 148 /* 149 * Sanity check: is this operation listed 150 * in the list of operations? We check this 151 * by seeing if its offest is zero. Since 152 * the default routine should always be listed 153 * first, it should be the only one with a zero 154 * offset. Any other operation with a zero 155 * offset is probably not listed in 156 * vfs_op_descs, and so is probably an error. 157 * 158 * A panic here means the layer programmer 159 * has committed the all-too common bug 160 * of adding a new operation to the layer's 161 * list of vnode operations but 162 * not adding the operation to the system-wide 163 * list of supported operations. 164 */ 165 if (opve_descp->opve_op->vdesc_offset == 0 && 166 opve_descp->opve_op->vdesc_offset != 167 VOFFSET(vop_default)) { 168 printf("operation %s not listed in %s.\n", 169 opve_descp->opve_op->vdesc_name, 170 "vfs_op_descs"); 171 panic ("vfs_opv_init: bad operation"); 172 } 173 /* 174 * Fill in this entry. 175 */ 176 opv_desc_vector[opve_descp->opve_op->vdesc_offset] = 177 opve_descp->opve_impl; 178 } 179 } 180 /* 181 * Finally, go back and replace unfilled routines 182 * with their default. (Sigh, an O(n^3) algorithm. I 183 * could make it better, but that'd be work, and n is small.) 184 */ 185 for (i = 0; them[i]; i++) { 186 opv_desc_vector = *(them[i]->opv_desc_vector_p); 187 /* 188 * Force every operations vector to have a default routine. 189 */ 190 if (opv_desc_vector[VOFFSET(vop_default)]==NULL) { 191 panic("vfs_opv_init: operation vector without default routine."); 192 } 193 for (k = 0; k<vfs_opv_numops; k++) 194 if (opv_desc_vector[k] == NULL) 195 opv_desc_vector[k] = 196 opv_desc_vector[VOFFSET(vop_default)]; 197 } 198} 199 200/* 201 * Initialize known vnode operations vectors. 202 */ 203static void 204vfs_op_init() 205{ 206 int i; 207 208 DODEBUG(printf("Vnode_interface_init.\n")); 209 /* 210 * Set all vnode vectors to a well known value. 211 */ 212 for (i = 0; vfs_opv_descs[i]; i++) 213 *(vfs_opv_descs[i]->opv_desc_vector_p) = NULL; 214 /* 215 * Figure out how many ops there are by counting the table, 216 * and assign each its offset. 217 */ 218 for (vfs_opv_numops = 0, i = 0; vfs_op_descs[i]; i++) { 219 vfs_op_descs[i]->vdesc_offset = vfs_opv_numops; 220 vfs_opv_numops++; 221 } 222 DODEBUG(printf ("vfs_opv_numops=%d\n", vfs_opv_numops)); 223} 224 225/* 226 * Routines having to do with the management of the vnode table. 227 */ 228extern struct vnodeops dead_vnodeops; 229extern struct vnodeops spec_vnodeops; 230struct vattr va_null; 231 232/* 233 * Initialize the vnode structures and initialize each file system type. 234 */ 235/* ARGSUSED*/ 236static void 237vfsinit(dummy) 238 void *dummy; 239{ 240 struct vfsconf **vfc; 241 int maxtypenum; 242 243 /* 244 * Initialize the vnode table 245 */ 246 vntblinit(); 247 /* 248 * Initialize the vnode name cache 249 */ 250 nchinit(); 251 /* 252 * Build vnode operation vectors. 253 */ 254 vfs_op_init(); 255 vfs_opv_init(vfs_opv_descs); /* finish the job */ 256 /* 257 * Initialize each file system type. 258 */ 259 vattr_null(&va_null); 260 maxtypenum = 0; 261 vfc = (struct vfsconf **)vfs_set.ls_items; 262 vfsconf = *vfc; /* simulate Lite2 vfsconf array */ 263 while (*vfc) { 264 struct vfsconf *vfsp = *vfc; 265 266 vfc++; 267 vfsp->vfc_next = *vfc; 268 if (maxtypenum <= vfsp->vfc_typenum) 269 maxtypenum = vfsp->vfc_typenum + 1; 270 (*vfsp->vfc_vfsops->vfs_init)(vfsp); 271 } 272 /* next vfc_typenum to be used */ 273 maxvfsconf = maxtypenum; 274} 275 276/* 277 * kernel related system variables. 278 */ 279 280static int 281sysctl_vfs_conf SYSCTL_HANDLER_ARGS 282{ 283 int error; 284 struct vfsconf *vfsp; 285 286 if (req->newptr) 287 return EINVAL; 288 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) { 289 error = SYSCTL_OUT(req, vfsp, sizeof *vfsp); 290 if (error) 291 return error; 292 } 293 return 0; 294} 295 296SYSCTL_PROC(_vfs, VFS_VFSCONF, vfsconf, CTLTYPE_OPAQUE|CTLFLAG_RD, 297 0, 0, sysctl_vfs_conf, "S,vfsconf", ""); 298 299#ifdef COMPAT_PRELITE2 300 301#define OVFS_MAXNAMELEN 32 302struct ovfsconf { 303 void *vfc_vfsops; 304 char vfc_name[OVFS_MAXNAMELEN]; 305 int vfc_index; 306 int vfc_refcount; 307 int vfc_flags; 308}; 309 310static int 311sysctl_ovfs_conf SYSCTL_HANDLER_ARGS 312{ 313 int error; 314 struct vfsconf *vfsp; 315 316 if (req->newptr) 317 return EINVAL; 318 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) { 319 struct ovfsconf ovfs; 320 ovfs.vfc_vfsops = NULL; 321 strcpy(ovfs.vfc_name, vfsp->vfc_name); 322 ovfs.vfc_index = vfsp->vfc_typenum; 323 ovfs.vfc_refcount = vfsp->vfc_refcount; 324 ovfs.vfc_flags = vfsp->vfc_flags; 325 error = SYSCTL_OUT(req, &ovfs, sizeof ovfs); 326 if (error) 327 return error; 328 } 329 return 0; 330} 331 332SYSCTL_PROC(_vfs, VFS_OVFSCONF, ovfsconf, CTLTYPE_OPAQUE|CTLFLAG_RD, 333 0, 0, sysctl_ovfs_conf, "S,ovfsconf", ""); 334 335#endif /* COMPAT_PRELITE2 */ 336 337/* 338 * This goop is here to support a loadable NFS module... grumble... 339 */ 340int (*lease_check_hook) __P((struct vop_lease_args *)) 341 = 0; 342void (*lease_updatetime) __P((int)) 343 = 0; 344 345int 346lease_check(ap) 347 struct vop_lease_args /* { 348 struct vnode *a_vp; 349 struct proc *a_p; 350 struct ucred *a_cred; 351 int a_flag; 352 } */ *ap; 353{ 354 if (lease_check_hook) 355 return (*lease_check_hook)(ap); 356 else 357 return 0; 358} 359