kernfs_vfsops.c revision 1.48
1 /* $NetBSD: kernfs_vfsops.c,v 1.48 2003/04/16 21:44:23 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software donated to Berkeley by 8 * Jan-Simon Pendry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * 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 * @(#)kernfs_vfsops.c 8.10 (Berkeley) 5/14/95 39 */ 40 41 /* 42 * Kernel params Filesystem 43 */ 44 45 #include <sys/cdefs.h> 46 __KERNEL_RCSID(0, "$NetBSD: kernfs_vfsops.c,v 1.48 2003/04/16 21:44:23 christos Exp $"); 47 48 #if defined(_KERNEL_OPT) 49 #include "opt_compat_netbsd.h" 50 #endif 51 52 #include <sys/param.h> 53 #include <sys/systm.h> 54 #include <sys/conf.h> 55 #include <sys/proc.h> 56 #include <sys/vnode.h> 57 #include <sys/mount.h> 58 #include <sys/namei.h> 59 #include <sys/malloc.h> 60 61 #include <miscfs/specfs/specdev.h> 62 #include <miscfs/kernfs/kernfs.h> 63 64 MALLOC_DEFINE(M_KERNFSMNT, "kernfs mount", "kernfs mount structures"); 65 66 dev_t rrootdev = NODEV; 67 68 void kernfs_init __P((void)); 69 void kernfs_done __P((void)); 70 void kernfs_get_rrootdev __P((void)); 71 int kernfs_mount __P((struct mount *, const char *, void *, 72 struct nameidata *, struct proc *)); 73 int kernfs_start __P((struct mount *, int, struct proc *)); 74 int kernfs_unmount __P((struct mount *, int, struct proc *)); 75 int kernfs_root __P((struct mount *, struct vnode **)); 76 int kernfs_statfs __P((struct mount *, struct statfs *, struct proc *)); 77 int kernfs_quotactl __P((struct mount *, int, uid_t, caddr_t, 78 struct proc *)); 79 int kernfs_sync __P((struct mount *, int, struct ucred *, struct proc *)); 80 int kernfs_vget __P((struct mount *, ino_t, struct vnode **)); 81 int kernfs_fhtovp __P((struct mount *, struct fid *, struct vnode **)); 82 int kernfs_checkexp __P((struct mount *, struct mbuf *, int *, 83 struct ucred **)); 84 int kernfs_vptofh __P((struct vnode *, struct fid *)); 85 int kernfs_sysctl __P((int *, u_int, void *, size_t *, void *, size_t, 86 struct proc *)); 87 88 void 89 kernfs_init() 90 { 91 } 92 93 void 94 kernfs_done() 95 { 96 } 97 98 void 99 kernfs_get_rrootdev() 100 { 101 static int tried = 0; 102 103 if (tried) { 104 /* Already did it once. */ 105 return; 106 } 107 tried = 1; 108 109 if (rootdev == NODEV) 110 return; 111 rrootdev = devsw_blk2chr(rootdev); 112 if (rrootdev != NODEV) { 113 #ifdef KERNFS_DIAGNOSTIC 114 printf("kernfs_mount: rootdev = %u.%u; rrootdev = %u.%u\n", 115 major(rootdev), minor(rootdev), major(rrootdev), minor(rrootdev)); 116 #endif 117 return; 118 } 119 rrootdev = NODEV; 120 printf("kernfs_get_rrootdev: no raw root device\n"); 121 } 122 123 /* 124 * Mount the Kernel params filesystem 125 */ 126 int 127 kernfs_mount(mp, path, data, ndp, p) 128 struct mount *mp; 129 const char *path; 130 void *data; 131 struct nameidata *ndp; 132 struct proc *p; 133 { 134 int error = 0; 135 struct kernfs_mount *fmp; 136 struct vnode *rvp; 137 138 #ifdef KERNFS_DIAGNOSTIC 139 printf("kernfs_mount(mp = %p)\n", mp); 140 #endif 141 142 if (mp->mnt_flag & MNT_GETARGS) 143 return 0; 144 /* 145 * Update is a no-op 146 */ 147 if (mp->mnt_flag & MNT_UPDATE) 148 return (EOPNOTSUPP); 149 150 error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp); 151 if (error) 152 return (error); 153 154 MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount), 155 M_KERNFSMNT, M_WAITOK); 156 rvp->v_type = VDIR; 157 rvp->v_flag |= VROOT; 158 #ifdef KERNFS_DIAGNOSTIC 159 printf("kernfs_mount: root vp = %p\n", rvp); 160 #endif 161 fmp->kf_root = rvp; 162 mp->mnt_flag |= MNT_LOCAL; 163 mp->mnt_data = fmp; 164 vfs_getnewfsid(mp); 165 166 error = set_statfs_info(path, UIO_USERSPACE, "kernfs", UIO_SYSSPACE, 167 mp, p); 168 #ifdef KERNFS_DIAGNOSTIC 169 printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname); 170 #endif 171 172 kernfs_get_rrootdev(); 173 return error; 174 } 175 176 int 177 kernfs_start(mp, flags, p) 178 struct mount *mp; 179 int flags; 180 struct proc *p; 181 { 182 183 return (0); 184 } 185 186 int 187 kernfs_unmount(mp, mntflags, p) 188 struct mount *mp; 189 int mntflags; 190 struct proc *p; 191 { 192 int error; 193 int flags = 0; 194 struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root; 195 196 #ifdef KERNFS_DIAGNOSTIC 197 printf("kernfs_unmount(mp = %p)\n", mp); 198 #endif 199 200 if (mntflags & MNT_FORCE) 201 flags |= FORCECLOSE; 202 203 /* 204 * Clear out buffer cache. I don't think we 205 * ever get anything cached at this level at the 206 * moment, but who knows... 207 */ 208 if (rootvp->v_usecount > 1) 209 return (EBUSY); 210 #ifdef KERNFS_DIAGNOSTIC 211 printf("kernfs_unmount: calling vflush\n"); 212 #endif 213 if ((error = vflush(mp, rootvp, flags)) != 0) 214 return (error); 215 216 #ifdef KERNFS_DIAGNOSTIC 217 vprint("kernfs root", rootvp); 218 #endif 219 /* 220 * Clean out the old root vnode for reuse. 221 */ 222 vrele(rootvp); 223 vgone(rootvp); 224 /* 225 * Finally, throw away the kernfs_mount structure 226 */ 227 free(mp->mnt_data, M_KERNFSMNT); 228 mp->mnt_data = 0; 229 return (0); 230 } 231 232 int 233 kernfs_root(mp, vpp) 234 struct mount *mp; 235 struct vnode **vpp; 236 { 237 struct vnode *vp; 238 239 #ifdef KERNFS_DIAGNOSTIC 240 printf("kernfs_root(mp = %p)\n", mp); 241 #endif 242 243 /* 244 * Return locked reference to root. 245 */ 246 vp = VFSTOKERNFS(mp)->kf_root; 247 VREF(vp); 248 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 249 *vpp = vp; 250 return (0); 251 } 252 253 int 254 kernfs_quotactl(mp, cmd, uid, arg, p) 255 struct mount *mp; 256 int cmd; 257 uid_t uid; 258 caddr_t arg; 259 struct proc *p; 260 { 261 262 return (EOPNOTSUPP); 263 } 264 265 int 266 kernfs_statfs(mp, sbp, p) 267 struct mount *mp; 268 struct statfs *sbp; 269 struct proc *p; 270 { 271 272 #ifdef KERNFS_DIAGNOSTIC 273 printf("kernfs_statfs(mp = %p)\n", mp); 274 #endif 275 276 sbp->f_bsize = DEV_BSIZE; 277 sbp->f_iosize = DEV_BSIZE; 278 sbp->f_blocks = 2; /* 1K to keep df happy */ 279 sbp->f_bfree = 0; 280 sbp->f_bavail = 0; 281 sbp->f_files = 0; 282 sbp->f_ffree = 0; 283 #ifdef COMPAT_09 284 sbp->f_type = 7; 285 #else 286 sbp->f_type = 0; 287 #endif 288 copy_statfs_info(sbp, mp); 289 return (0); 290 } 291 292 /*ARGSUSED*/ 293 int 294 kernfs_sync(mp, waitfor, uc, p) 295 struct mount *mp; 296 int waitfor; 297 struct ucred *uc; 298 struct proc *p; 299 { 300 301 return (0); 302 } 303 304 /* 305 * Kernfs flat namespace lookup. 306 * Currently unsupported. 307 */ 308 int 309 kernfs_vget(mp, ino, vpp) 310 struct mount *mp; 311 ino_t ino; 312 struct vnode **vpp; 313 { 314 315 return (EOPNOTSUPP); 316 } 317 318 /*ARGSUSED*/ 319 int 320 kernfs_fhtovp(mp, fhp, vpp) 321 struct mount *mp; 322 struct fid *fhp; 323 struct vnode **vpp; 324 { 325 326 return (EOPNOTSUPP); 327 } 328 329 /*ARGSUSED*/ 330 int 331 kernfs_checkexp(mp, mb, what, anon) 332 struct mount *mp; 333 struct mbuf *mb; 334 int *what; 335 struct ucred **anon; 336 { 337 338 return (EOPNOTSUPP); 339 } 340 341 /*ARGSUSED*/ 342 int 343 kernfs_vptofh(vp, fhp) 344 struct vnode *vp; 345 struct fid *fhp; 346 { 347 348 return (EOPNOTSUPP); 349 } 350 351 int 352 kernfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 353 int *name; 354 u_int namelen; 355 void *oldp; 356 size_t *oldlenp; 357 void *newp; 358 size_t newlen; 359 struct proc *p; 360 { 361 return (EOPNOTSUPP); 362 } 363 364 extern const struct vnodeopv_desc kernfs_vnodeop_opv_desc; 365 366 const struct vnodeopv_desc * const kernfs_vnodeopv_descs[] = { 367 &kernfs_vnodeop_opv_desc, 368 NULL, 369 }; 370 371 struct vfsops kernfs_vfsops = { 372 MOUNT_KERNFS, 373 kernfs_mount, 374 kernfs_start, 375 kernfs_unmount, 376 kernfs_root, 377 kernfs_quotactl, 378 kernfs_statfs, 379 kernfs_sync, 380 kernfs_vget, 381 kernfs_fhtovp, 382 kernfs_vptofh, 383 kernfs_init, 384 NULL, 385 kernfs_done, 386 kernfs_sysctl, 387 NULL, /* vfs_mountroot */ 388 kernfs_checkexp, 389 kernfs_vnodeopv_descs, 390 }; 391
Indexes created Tue Sep 23 14:10:03 GMT 2025