kernfs_vfsops.c revision 1.37
1 /* $NetBSD: kernfs_vfsops.c,v 1.37 2000/06/10 18:27:03 assar 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 return; 112 } 113 rrootdev = NODEV; 114 printf("kernfs_get_rrootdev: no raw root device\n"); 115 } 116 117 /* 118 * Mount the Kernel params filesystem 119 */ 120 int 121 kernfs_mount(mp, path, data, ndp, p) 122 struct mount *mp; 123 const char *path; 124 void *data; 125 struct nameidata *ndp; 126 struct proc *p; 127 { 128 int error = 0; 129 size_t size; 130 struct kernfs_mount *fmp; 131 struct vnode *rvp; 132 133 #ifdef KERNFS_DIAGNOSTIC 134 printf("kernfs_mount(mp = %p)\n", mp); 135 #endif 136 137 /* 138 * Update is a no-op 139 */ 140 if (mp->mnt_flag & MNT_UPDATE) 141 return (EOPNOTSUPP); 142 143 error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp); 144 if (error) 145 return (error); 146 147 MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount), 148 M_MISCFSMNT, M_WAITOK); 149 rvp->v_type = VDIR; 150 rvp->v_flag |= VROOT; 151 #ifdef KERNFS_DIAGNOSTIC 152 printf("kernfs_mount: root vp = %p\n", rvp); 153 #endif 154 fmp->kf_root = rvp; 155 mp->mnt_flag |= MNT_LOCAL; 156 mp->mnt_data = (qaddr_t)fmp; 157 vfs_getnewfsid(mp); 158 159 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 160 memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size); 161 memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN); 162 memcpy(mp->mnt_stat.f_mntfromname, "kernfs", sizeof("kernfs")); 163 #ifdef KERNFS_DIAGNOSTIC 164 printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname); 165 #endif 166 167 kernfs_get_rrootdev(); 168 return (0); 169 } 170 171 int 172 kernfs_start(mp, flags, p) 173 struct mount *mp; 174 int flags; 175 struct proc *p; 176 { 177 178 return (0); 179 } 180 181 int 182 kernfs_unmount(mp, mntflags, p) 183 struct mount *mp; 184 int mntflags; 185 struct proc *p; 186 { 187 int error; 188 int flags = 0; 189 struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root; 190 191 #ifdef KERNFS_DIAGNOSTIC 192 printf("kernfs_unmount(mp = %p)\n", mp); 193 #endif 194 195 if (mntflags & MNT_FORCE) 196 flags |= FORCECLOSE; 197 198 /* 199 * Clear out buffer cache. I don't think we 200 * ever get anything cached at this level at the 201 * moment, but who knows... 202 */ 203 if (rootvp->v_usecount > 1) 204 return (EBUSY); 205 #ifdef KERNFS_DIAGNOSTIC 206 printf("kernfs_unmount: calling vflush\n"); 207 #endif 208 if ((error = vflush(mp, rootvp, flags)) != 0) 209 return (error); 210 211 #ifdef KERNFS_DIAGNOSTIC 212 vprint("kernfs root", rootvp); 213 #endif 214 /* 215 * Clean out the old root vnode for reuse. 216 */ 217 vrele(rootvp); 218 vgone(rootvp); 219 /* 220 * Finally, throw away the kernfs_mount structure 221 */ 222 free(mp->mnt_data, M_MISCFSMNT); 223 mp->mnt_data = 0; 224 return (0); 225 } 226 227 int 228 kernfs_root(mp, vpp) 229 struct mount *mp; 230 struct vnode **vpp; 231 { 232 struct vnode *vp; 233 234 #ifdef KERNFS_DIAGNOSTIC 235 printf("kernfs_root(mp = %p)\n", mp); 236 #endif 237 238 /* 239 * Return locked reference to root. 240 */ 241 vp = VFSTOKERNFS(mp)->kf_root; 242 VREF(vp); 243 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 244 *vpp = vp; 245 return (0); 246 } 247 248 int 249 kernfs_quotactl(mp, cmd, uid, arg, p) 250 struct mount *mp; 251 int cmd; 252 uid_t uid; 253 caddr_t arg; 254 struct proc *p; 255 { 256 257 return (EOPNOTSUPP); 258 } 259 260 int 261 kernfs_statfs(mp, sbp, p) 262 struct mount *mp; 263 struct statfs *sbp; 264 struct proc *p; 265 { 266 267 #ifdef KERNFS_DIAGNOSTIC 268 printf("kernfs_statfs(mp = %p)\n", mp); 269 #endif 270 271 sbp->f_bsize = DEV_BSIZE; 272 sbp->f_iosize = DEV_BSIZE; 273 sbp->f_blocks = 2; /* 1K to keep df happy */ 274 sbp->f_bfree = 0; 275 sbp->f_bavail = 0; 276 sbp->f_files = 0; 277 sbp->f_ffree = 0; 278 #ifdef COMPAT_09 279 sbp->f_type = 7; 280 #else 281 sbp->f_type = 0; 282 #endif 283 if (sbp != &mp->mnt_stat) { 284 memcpy(&sbp->f_fsid, &mp->mnt_stat.f_fsid, sizeof(sbp->f_fsid)); 285 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 286 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 287 } 288 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 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 struct vnodeopv_desc kernfs_vnodeop_opv_desc; 365 366 struct vnodeopv_desc *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 kernfs_done, 385 kernfs_sysctl, 386 NULL, /* vfs_mountroot */ 387 kernfs_checkexp, 388 kernfs_vnodeopv_descs, 389 }; 390
Indexes created Tue Sep 23 14:10:03 GMT 2025