kernfs_vfsops.c revision 1.39.2.5
1 /* $NetBSD: kernfs_vfsops.c,v 1.39.2.5 2002/08/01 02:46:30 nathanw 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 1.39.2.5 2002/08/01 02:46:30 nathanw 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 dev_t rrootdev = NODEV; 65 66 void kernfs_init __P((void)); 67 void kernfs_done __P((void)); 68 void kernfs_get_rrootdev __P((void)); 69 int kernfs_mount __P((struct mount *, const char *, void *, 70 struct nameidata *, struct proc *)); 71 int kernfs_start __P((struct mount *, int, struct proc *)); 72 int kernfs_unmount __P((struct mount *, int, struct proc *)); 73 int kernfs_root __P((struct mount *, struct vnode **)); 74 int kernfs_statfs __P((struct mount *, struct statfs *, struct proc *)); 75 int kernfs_quotactl __P((struct mount *, int, uid_t, caddr_t, 76 struct proc *)); 77 int kernfs_sync __P((struct mount *, int, struct ucred *, struct proc *)); 78 int kernfs_vget __P((struct mount *, ino_t, struct vnode **)); 79 int kernfs_fhtovp __P((struct mount *, struct fid *, struct vnode **)); 80 int kernfs_checkexp __P((struct mount *, struct mbuf *, int *, 81 struct ucred **)); 82 int kernfs_vptofh __P((struct vnode *, struct fid *)); 83 int kernfs_sysctl __P((int *, u_int, void *, size_t *, void *, size_t, 84 struct proc *)); 85 86 void 87 kernfs_init() 88 { 89 } 90 91 void 92 kernfs_done() 93 { 94 } 95 96 void 97 kernfs_get_rrootdev() 98 { 99 static int tried = 0; 100 int cmaj; 101 102 if (tried) { 103 /* Already did it once. */ 104 return; 105 } 106 tried = 1; 107 108 if (rootdev == NODEV) 109 return; 110 for (cmaj = 0; cmaj < nchrdev; cmaj++) { 111 rrootdev = makedev(cmaj, minor(rootdev)); 112 if (chrtoblk(rrootdev) == rootdev) { 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 } 120 rrootdev = NODEV; 121 printf("kernfs_get_rrootdev: no raw root device\n"); 122 } 123 124 /* 125 * Mount the Kernel params filesystem 126 */ 127 int 128 kernfs_mount(mp, path, data, ndp, p) 129 struct mount *mp; 130 const char *path; 131 void *data; 132 struct nameidata *ndp; 133 struct proc *p; 134 { 135 int error = 0; 136 size_t size; 137 struct kernfs_mount *fmp; 138 struct vnode *rvp; 139 140 #ifdef KERNFS_DIAGNOSTIC 141 printf("kernfs_mount(mp = %p)\n", mp); 142 #endif 143 144 /* 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_MISCFSMNT, 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 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 167 memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size); 168 memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN); 169 memcpy(mp->mnt_stat.f_mntfromname, "kernfs", sizeof("kernfs")); 170 #ifdef KERNFS_DIAGNOSTIC 171 printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname); 172 #endif 173 174 kernfs_get_rrootdev(); 175 return (0); 176 } 177 178 int 179 kernfs_start(mp, flags, p) 180 struct mount *mp; 181 int flags; 182 struct proc *p; 183 { 184 185 return (0); 186 } 187 188 int 189 kernfs_unmount(mp, mntflags, p) 190 struct mount *mp; 191 int mntflags; 192 struct proc *p; 193 { 194 int error; 195 int flags = 0; 196 struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root; 197 198 #ifdef KERNFS_DIAGNOSTIC 199 printf("kernfs_unmount(mp = %p)\n", mp); 200 #endif 201 202 if (mntflags & MNT_FORCE) 203 flags |= FORCECLOSE; 204 205 /* 206 * Clear out buffer cache. I don't think we 207 * ever get anything cached at this level at the 208 * moment, but who knows... 209 */ 210 if (rootvp->v_usecount > 1) 211 return (EBUSY); 212 #ifdef KERNFS_DIAGNOSTIC 213 printf("kernfs_unmount: calling vflush\n"); 214 #endif 215 if ((error = vflush(mp, rootvp, flags)) != 0) 216 return (error); 217 218 #ifdef KERNFS_DIAGNOSTIC 219 vprint("kernfs root", rootvp); 220 #endif 221 /* 222 * Clean out the old root vnode for reuse. 223 */ 224 vrele(rootvp); 225 vgone(rootvp); 226 /* 227 * Finally, throw away the kernfs_mount structure 228 */ 229 free(mp->mnt_data, M_MISCFSMNT); 230 mp->mnt_data = 0; 231 return (0); 232 } 233 234 int 235 kernfs_root(mp, vpp) 236 struct mount *mp; 237 struct vnode **vpp; 238 { 239 struct vnode *vp; 240 241 #ifdef KERNFS_DIAGNOSTIC 242 printf("kernfs_root(mp = %p)\n", mp); 243 #endif 244 245 /* 246 * Return locked reference to root. 247 */ 248 vp = VFSTOKERNFS(mp)->kf_root; 249 VREF(vp); 250 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 251 *vpp = vp; 252 return (0); 253 } 254 255 int 256 kernfs_quotactl(mp, cmd, uid, arg, p) 257 struct mount *mp; 258 int cmd; 259 uid_t uid; 260 caddr_t arg; 261 struct proc *p; 262 { 263 264 return (EOPNOTSUPP); 265 } 266 267 int 268 kernfs_statfs(mp, sbp, p) 269 struct mount *mp; 270 struct statfs *sbp; 271 struct proc *p; 272 { 273 274 #ifdef KERNFS_DIAGNOSTIC 275 printf("kernfs_statfs(mp = %p)\n", mp); 276 #endif 277 278 sbp->f_bsize = DEV_BSIZE; 279 sbp->f_iosize = DEV_BSIZE; 280 sbp->f_blocks = 2; /* 1K to keep df happy */ 281 sbp->f_bfree = 0; 282 sbp->f_bavail = 0; 283 sbp->f_files = 0; 284 sbp->f_ffree = 0; 285 #ifdef COMPAT_09 286 sbp->f_type = 7; 287 #else 288 sbp->f_type = 0; 289 #endif 290 if (sbp != &mp->mnt_stat) { 291 memcpy(&sbp->f_fsid, &mp->mnt_stat.f_fsid, sizeof(sbp->f_fsid)); 292 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 293 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 294 } 295 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 296 return (0); 297 } 298 299 /*ARGSUSED*/ 300 int 301 kernfs_sync(mp, waitfor, uc, p) 302 struct mount *mp; 303 int waitfor; 304 struct ucred *uc; 305 struct proc *p; 306 { 307 308 return (0); 309 } 310 311 /* 312 * Kernfs flat namespace lookup. 313 * Currently unsupported. 314 */ 315 int 316 kernfs_vget(mp, ino, vpp) 317 struct mount *mp; 318 ino_t ino; 319 struct vnode **vpp; 320 { 321 322 return (EOPNOTSUPP); 323 } 324 325 /*ARGSUSED*/ 326 int 327 kernfs_fhtovp(mp, fhp, vpp) 328 struct mount *mp; 329 struct fid *fhp; 330 struct vnode **vpp; 331 { 332 333 return (EOPNOTSUPP); 334 } 335 336 /*ARGSUSED*/ 337 int 338 kernfs_checkexp(mp, mb, what, anon) 339 struct mount *mp; 340 struct mbuf *mb; 341 int *what; 342 struct ucred **anon; 343 { 344 345 return (EOPNOTSUPP); 346 } 347 348 /*ARGSUSED*/ 349 int 350 kernfs_vptofh(vp, fhp) 351 struct vnode *vp; 352 struct fid *fhp; 353 { 354 355 return (EOPNOTSUPP); 356 } 357 358 int 359 kernfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 360 int *name; 361 u_int namelen; 362 void *oldp; 363 size_t *oldlenp; 364 void *newp; 365 size_t newlen; 366 struct proc *p; 367 { 368 return (EOPNOTSUPP); 369 } 370 371 extern const struct vnodeopv_desc kernfs_vnodeop_opv_desc; 372 373 const struct vnodeopv_desc * const kernfs_vnodeopv_descs[] = { 374 &kernfs_vnodeop_opv_desc, 375 NULL, 376 }; 377 378 struct vfsops kernfs_vfsops = { 379 MOUNT_KERNFS, 380 kernfs_mount, 381 kernfs_start, 382 kernfs_unmount, 383 kernfs_root, 384 kernfs_quotactl, 385 kernfs_statfs, 386 kernfs_sync, 387 kernfs_vget, 388 kernfs_fhtovp, 389 kernfs_vptofh, 390 kernfs_init, 391 NULL, 392 kernfs_done, 393 kernfs_sysctl, 394 NULL, /* vfs_mountroot */ 395 kernfs_checkexp, 396 kernfs_vnodeopv_descs, 397 }; 398
Indexes created Sun Sep 28 16:09:52 GMT 2025