1 /* $NetBSD: kernfs_vfsops.c,v 1.39 2001/02/04 10:20:00 mrg 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 #if defined(_KERNEL) && !defined(_LKM) 46 #include "opt_compat_netbsd.h" 47 #endif 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/conf.h> 52 #include <sys/types.h> 53 #include <sys/proc.h> 54 #include <sys/vnode.h> 55 #include <sys/mount.h> 56 #include <sys/namei.h> 57 #include <sys/malloc.h> 58 59 #include <miscfs/specfs/specdev.h> 60 #include <miscfs/kernfs/kernfs.h> 61 62 dev_t rrootdev = NODEV; 63 64 void kernfs_init __P((void)); 65 void kernfs_done __P((void)); 66 void kernfs_get_rrootdev __P((void)); 67 int kernfs_mount __P((struct mount *, const char *, void *, 68 struct nameidata *, struct proc *)); 69 int kernfs_start __P((struct mount *, int, struct proc *)); 70 int kernfs_unmount __P((struct mount *, int, struct proc *)); 71 int kernfs_root __P((struct mount *, struct vnode **)); 72 int kernfs_statfs __P((struct mount *, struct statfs *, struct proc *)); 73 int kernfs_quotactl __P((struct mount *, int, uid_t, caddr_t, 74 struct proc *)); 75 int kernfs_sync __P((struct mount *, int, struct ucred *, struct proc *)); 76 int kernfs_vget __P((struct mount *, ino_t, struct vnode **)); 77 int kernfs_fhtovp __P((struct mount *, struct fid *, struct vnode **)); 78 int kernfs_checkexp __P((struct mount *, struct mbuf *, int *, 79 struct ucred **)); 80 int kernfs_vptofh __P((struct vnode *, struct fid *)); 81 int kernfs_sysctl __P((int *, u_int, void *, size_t *, void *, size_t, 82 struct proc *)); 83 84 void 85 kernfs_init() 86 { 87 } 88 89 void 90 kernfs_done() 91 { 92 } 93 94 void 95 kernfs_get_rrootdev() 96 { 97 static int tried = 0; 98 int cmaj; 99 100 if (tried) { 101 /* Already did it once. */ 102 return; 103 } 104 tried = 1; 105 106 if (rootdev == NODEV) 107 return; 108 for (cmaj = 0; cmaj < nchrdev; cmaj++) { 109 rrootdev = makedev(cmaj, minor(rootdev)); 110 if (chrtoblk(rrootdev) == rootdev) { 111 #ifdef KERNFS_DIAGNOSTIC 112 printf("kernfs_mount: rootdev = %u.%u; rrootdev = %u.%u\n", 113 major(rootdev), minor(rootdev), major(rrootdev), minor(rrootdev)); 114 #endif 115 return; 116 } 117 } 118 rrootdev = NODEV; 119 printf("kernfs_get_rrootdev: no raw root device\n"); 120 } 121 122 /* 123 * Mount the Kernel params filesystem 124 */ 125 int 126 kernfs_mount(mp, path, data, ndp, p) 127 struct mount *mp; 128 const char *path; 129 void *data; 130 struct nameidata *ndp; 131 struct proc *p; 132 { 133 int error = 0; 134 size_t size; 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 /* 143 * Update is a no-op 144 */ 145 if (mp->mnt_flag & MNT_UPDATE) 146 return (EOPNOTSUPP); 147 148 error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp); 149 if (error) 150 return (error); 151 152 MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount), 153 M_MISCFSMNT, M_WAITOK); 154 rvp->v_type = VDIR; 155 rvp->v_flag |= VROOT; 156 #ifdef KERNFS_DIAGNOSTIC 157 printf("kernfs_mount: root vp = %p\n", rvp); 158 #endif 159 fmp->kf_root = rvp; 160 mp->mnt_flag |= MNT_LOCAL; 161 mp->mnt_data = (qaddr_t)fmp; 162 vfs_getnewfsid(mp); 163 164 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 165 memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size); 166 memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN); 167 memcpy(mp->mnt_stat.f_mntfromname, "kernfs", sizeof("kernfs")); 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 (0); 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_MISCFSMNT); 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 if (sbp != &mp->mnt_stat) { 289 memcpy(&sbp->f_fsid, &mp->mnt_stat.f_fsid, sizeof(sbp->f_fsid)); 290 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 291 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 292 } 293 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 294 return (0); 295 } 296 297 /*ARGSUSED*/ 298 int 299 kernfs_sync(mp, waitfor, uc, p) 300 struct mount *mp; 301 int waitfor; 302 struct ucred *uc; 303 struct proc *p; 304 { 305 306 return (0); 307 } 308 309 /* 310 * Kernfs flat namespace lookup. 311 * Currently unsupported. 312 */ 313 int 314 kernfs_vget(mp, ino, vpp) 315 struct mount *mp; 316 ino_t ino; 317 struct vnode **vpp; 318 { 319 320 return (EOPNOTSUPP); 321 } 322 323 /*ARGSUSED*/ 324 int 325 kernfs_fhtovp(mp, fhp, vpp) 326 struct mount *mp; 327 struct fid *fhp; 328 struct vnode **vpp; 329 { 330 331 return (EOPNOTSUPP); 332 } 333 334 /*ARGSUSED*/ 335 int 336 kernfs_checkexp(mp, mb, what, anon) 337 struct mount *mp; 338 struct mbuf *mb; 339 int *what; 340 struct ucred **anon; 341 { 342 343 return (EOPNOTSUPP); 344 } 345 346 /*ARGSUSED*/ 347 int 348 kernfs_vptofh(vp, fhp) 349 struct vnode *vp; 350 struct fid *fhp; 351 { 352 353 return (EOPNOTSUPP); 354 } 355 356 int 357 kernfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 358 int *name; 359 u_int namelen; 360 void *oldp; 361 size_t *oldlenp; 362 void *newp; 363 size_t newlen; 364 struct proc *p; 365 { 366 return (EOPNOTSUPP); 367 } 368 369 extern const struct vnodeopv_desc kernfs_vnodeop_opv_desc; 370 371 const struct vnodeopv_desc * const kernfs_vnodeopv_descs[] = { 372 &kernfs_vnodeop_opv_desc, 373 NULL, 374 }; 375 376 struct vfsops kernfs_vfsops = { 377 MOUNT_KERNFS, 378 kernfs_mount, 379 kernfs_start, 380 kernfs_unmount, 381 kernfs_root, 382 kernfs_quotactl, 383 kernfs_statfs, 384 kernfs_sync, 385 kernfs_vget, 386 kernfs_fhtovp, 387 kernfs_vptofh, 388 kernfs_init, 389 kernfs_done, 390 kernfs_sysctl, 391 NULL, /* vfs_mountroot */ 392 kernfs_checkexp, 393 kernfs_vnodeopv_descs, 394 }; 395