kernfs_vfsops.c revision 1.42
1 /* $NetBSD: kernfs_vfsops.c,v 1.42 2001/11/10 13:33:42 lukem 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 1.42 2001/11/10 13:33:42 lukem 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/types.h> 56 #include <sys/proc.h> 57 #include <sys/vnode.h> 58 #include <sys/mount.h> 59 #include <sys/namei.h> 60 #include <sys/malloc.h> 61 62 #include <miscfs/specfs/specdev.h> 63 #include <miscfs/kernfs/kernfs.h> 64 65 dev_t rrootdev = NODEV; 66 67 void kernfs_init __P((void)); 68 void kernfs_done __P((void)); 69 void kernfs_get_rrootdev __P((void)); 70 int kernfs_mount __P((struct mount *, const char *, void *, 71 struct nameidata *, struct proc *)); 72 int kernfs_start __P((struct mount *, int, struct proc *)); 73 int kernfs_unmount __P((struct mount *, int, struct proc *)); 74 int kernfs_root __P((struct mount *, struct vnode **)); 75 int kernfs_statfs __P((struct mount *, struct statfs *, struct proc *)); 76 int kernfs_quotactl __P((struct mount *, int, uid_t, caddr_t, 77 struct proc *)); 78 int kernfs_sync __P((struct mount *, int, struct ucred *, struct proc *)); 79 int kernfs_vget __P((struct mount *, ino_t, struct vnode **)); 80 int kernfs_fhtovp __P((struct mount *, struct fid *, struct vnode **)); 81 int kernfs_checkexp __P((struct mount *, struct mbuf *, int *, 82 struct ucred **)); 83 int kernfs_vptofh __P((struct vnode *, struct fid *)); 84 int kernfs_sysctl __P((int *, u_int, void *, size_t *, void *, size_t, 85 struct proc *)); 86 87 void 88 kernfs_init() 89 { 90 } 91 92 void 93 kernfs_done() 94 { 95 } 96 97 void 98 kernfs_get_rrootdev() 99 { 100 static int tried = 0; 101 int cmaj; 102 103 if (tried) { 104 /* Already did it once. */ 105 return; 106 } 107 tried = 1; 108 109 if (rootdev == NODEV) 110 return; 111 for (cmaj = 0; cmaj < nchrdev; cmaj++) { 112 rrootdev = makedev(cmaj, minor(rootdev)); 113 if (chrtoblk(rrootdev) == rootdev) { 114 #ifdef KERNFS_DIAGNOSTIC 115 printf("kernfs_mount: rootdev = %u.%u; rrootdev = %u.%u\n", 116 major(rootdev), minor(rootdev), major(rrootdev), minor(rrootdev)); 117 #endif 118 return; 119 } 120 } 121 rrootdev = NODEV; 122 printf("kernfs_get_rrootdev: no raw root device\n"); 123 } 124 125 /* 126 * Mount the Kernel params filesystem 127 */ 128 int 129 kernfs_mount(mp, path, data, ndp, p) 130 struct mount *mp; 131 const char *path; 132 void *data; 133 struct nameidata *ndp; 134 struct proc *p; 135 { 136 int error = 0; 137 size_t size; 138 struct kernfs_mount *fmp; 139 struct vnode *rvp; 140 141 #ifdef KERNFS_DIAGNOSTIC 142 printf("kernfs_mount(mp = %p)\n", mp); 143 #endif 144 145 /* 146 * Update is a no-op 147 */ 148 if (mp->mnt_flag & MNT_UPDATE) 149 return (EOPNOTSUPP); 150 151 error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp); 152 if (error) 153 return (error); 154 155 MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount), 156 M_MISCFSMNT, M_WAITOK); 157 rvp->v_type = VDIR; 158 rvp->v_flag |= VROOT; 159 #ifdef KERNFS_DIAGNOSTIC 160 printf("kernfs_mount: root vp = %p\n", rvp); 161 #endif 162 fmp->kf_root = rvp; 163 mp->mnt_flag |= MNT_LOCAL; 164 mp->mnt_data = (qaddr_t)fmp; 165 vfs_getnewfsid(mp); 166 167 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 168 memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size); 169 memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN); 170 memcpy(mp->mnt_stat.f_mntfromname, "kernfs", sizeof("kernfs")); 171 #ifdef KERNFS_DIAGNOSTIC 172 printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname); 173 #endif 174 175 kernfs_get_rrootdev(); 176 return (0); 177 } 178 179 int 180 kernfs_start(mp, flags, p) 181 struct mount *mp; 182 int flags; 183 struct proc *p; 184 { 185 186 return (0); 187 } 188 189 int 190 kernfs_unmount(mp, mntflags, p) 191 struct mount *mp; 192 int mntflags; 193 struct proc *p; 194 { 195 int error; 196 int flags = 0; 197 struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root; 198 199 #ifdef KERNFS_DIAGNOSTIC 200 printf("kernfs_unmount(mp = %p)\n", mp); 201 #endif 202 203 if (mntflags & MNT_FORCE) 204 flags |= FORCECLOSE; 205 206 /* 207 * Clear out buffer cache. I don't think we 208 * ever get anything cached at this level at the 209 * moment, but who knows... 210 */ 211 if (rootvp->v_usecount > 1) 212 return (EBUSY); 213 #ifdef KERNFS_DIAGNOSTIC 214 printf("kernfs_unmount: calling vflush\n"); 215 #endif 216 if ((error = vflush(mp, rootvp, flags)) != 0) 217 return (error); 218 219 #ifdef KERNFS_DIAGNOSTIC 220 vprint("kernfs root", rootvp); 221 #endif 222 /* 223 * Clean out the old root vnode for reuse. 224 */ 225 vrele(rootvp); 226 vgone(rootvp); 227 /* 228 * Finally, throw away the kernfs_mount structure 229 */ 230 free(mp->mnt_data, M_MISCFSMNT); 231 mp->mnt_data = 0; 232 return (0); 233 } 234 235 int 236 kernfs_root(mp, vpp) 237 struct mount *mp; 238 struct vnode **vpp; 239 { 240 struct vnode *vp; 241 242 #ifdef KERNFS_DIAGNOSTIC 243 printf("kernfs_root(mp = %p)\n", mp); 244 #endif 245 246 /* 247 * Return locked reference to root. 248 */ 249 vp = VFSTOKERNFS(mp)->kf_root; 250 VREF(vp); 251 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 252 *vpp = vp; 253 return (0); 254 } 255 256 int 257 kernfs_quotactl(mp, cmd, uid, arg, p) 258 struct mount *mp; 259 int cmd; 260 uid_t uid; 261 caddr_t arg; 262 struct proc *p; 263 { 264 265 return (EOPNOTSUPP); 266 } 267 268 int 269 kernfs_statfs(mp, sbp, p) 270 struct mount *mp; 271 struct statfs *sbp; 272 struct proc *p; 273 { 274 275 #ifdef KERNFS_DIAGNOSTIC 276 printf("kernfs_statfs(mp = %p)\n", mp); 277 #endif 278 279 sbp->f_bsize = DEV_BSIZE; 280 sbp->f_iosize = DEV_BSIZE; 281 sbp->f_blocks = 2; /* 1K to keep df happy */ 282 sbp->f_bfree = 0; 283 sbp->f_bavail = 0; 284 sbp->f_files = 0; 285 sbp->f_ffree = 0; 286 #ifdef COMPAT_09 287 sbp->f_type = 7; 288 #else 289 sbp->f_type = 0; 290 #endif 291 if (sbp != &mp->mnt_stat) { 292 memcpy(&sbp->f_fsid, &mp->mnt_stat.f_fsid, sizeof(sbp->f_fsid)); 293 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 294 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 295 } 296 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 297 return (0); 298 } 299 300 /*ARGSUSED*/ 301 int 302 kernfs_sync(mp, waitfor, uc, p) 303 struct mount *mp; 304 int waitfor; 305 struct ucred *uc; 306 struct proc *p; 307 { 308 309 return (0); 310 } 311 312 /* 313 * Kernfs flat namespace lookup. 314 * Currently unsupported. 315 */ 316 int 317 kernfs_vget(mp, ino, vpp) 318 struct mount *mp; 319 ino_t ino; 320 struct vnode **vpp; 321 { 322 323 return (EOPNOTSUPP); 324 } 325 326 /*ARGSUSED*/ 327 int 328 kernfs_fhtovp(mp, fhp, vpp) 329 struct mount *mp; 330 struct fid *fhp; 331 struct vnode **vpp; 332 { 333 334 return (EOPNOTSUPP); 335 } 336 337 /*ARGSUSED*/ 338 int 339 kernfs_checkexp(mp, mb, what, anon) 340 struct mount *mp; 341 struct mbuf *mb; 342 int *what; 343 struct ucred **anon; 344 { 345 346 return (EOPNOTSUPP); 347 } 348 349 /*ARGSUSED*/ 350 int 351 kernfs_vptofh(vp, fhp) 352 struct vnode *vp; 353 struct fid *fhp; 354 { 355 356 return (EOPNOTSUPP); 357 } 358 359 int 360 kernfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 361 int *name; 362 u_int namelen; 363 void *oldp; 364 size_t *oldlenp; 365 void *newp; 366 size_t newlen; 367 struct proc *p; 368 { 369 return (EOPNOTSUPP); 370 } 371 372 extern const struct vnodeopv_desc kernfs_vnodeop_opv_desc; 373 374 const struct vnodeopv_desc * const kernfs_vnodeopv_descs[] = { 375 &kernfs_vnodeop_opv_desc, 376 NULL, 377 }; 378 379 struct vfsops kernfs_vfsops = { 380 MOUNT_KERNFS, 381 kernfs_mount, 382 kernfs_start, 383 kernfs_unmount, 384 kernfs_root, 385 kernfs_quotactl, 386 kernfs_statfs, 387 kernfs_sync, 388 kernfs_vget, 389 kernfs_fhtovp, 390 kernfs_vptofh, 391 kernfs_init, 392 NULL, 393 kernfs_done, 394 kernfs_sysctl, 395 NULL, /* vfs_mountroot */ 396 kernfs_checkexp, 397 kernfs_vnodeopv_descs, 398 }; 399
Indexes created Mon Sep 22 05:09:51 GMT 2025