kernfs_vfsops.c revision 1.32
1 /* $NetBSD: kernfs_vfsops.c,v 1.32 1998/03/01 02:21:04 fvdl 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/param.h> 46 #include <sys/systm.h> 47 #include <sys/conf.h> 48 #include <sys/types.h> 49 #include <sys/proc.h> 50 #include <sys/vnode.h> 51 #include <sys/mount.h> 52 #include <sys/namei.h> 53 #include <sys/malloc.h> 54 55 #include <miscfs/specfs/specdev.h> 56 #include <miscfs/kernfs/kernfs.h> 57 58 dev_t rrootdev = NODEV; 59 60 void kernfs_init __P((void)); 61 void kernfs_get_rrootdev __P((void)); 62 int kernfs_mount __P((struct mount *, const char *, void *, 63 struct nameidata *, struct proc *)); 64 int kernfs_start __P((struct mount *, int, struct proc *)); 65 int kernfs_unmount __P((struct mount *, int, struct proc *)); 66 int kernfs_root __P((struct mount *, struct vnode **)); 67 int kernfs_statfs __P((struct mount *, struct statfs *, struct proc *)); 68 int kernfs_quotactl __P((struct mount *, int, uid_t, caddr_t, 69 struct proc *)); 70 int kernfs_sync __P((struct mount *, int, struct ucred *, struct proc *)); 71 int kernfs_vget __P((struct mount *, ino_t, struct vnode **)); 72 int kernfs_fhtovp __P((struct mount *, struct fid *, struct mbuf *, 73 struct vnode **, int *, struct ucred **)); 74 int kernfs_vptofh __P((struct vnode *, struct fid *)); 75 int kernfs_sysctl __P((int *, u_int, void *, size_t *, void *, size_t, 76 struct proc *)); 77 78 void 79 kernfs_init() 80 { 81 } 82 83 void 84 kernfs_get_rrootdev() 85 { 86 static int tried = 0; 87 int cmaj; 88 89 if (tried) { 90 /* Already did it once. */ 91 return; 92 } 93 tried = 1; 94 95 if (rootdev == NODEV) 96 return; 97 for (cmaj = 0; cmaj < nchrdev; cmaj++) { 98 rrootdev = makedev(cmaj, minor(rootdev)); 99 if (chrtoblk(rrootdev) == rootdev) 100 return; 101 } 102 rrootdev = NODEV; 103 printf("kernfs_get_rrootdev: no raw root device\n"); 104 } 105 106 /* 107 * Mount the Kernel params filesystem 108 */ 109 int 110 kernfs_mount(mp, path, data, ndp, p) 111 struct mount *mp; 112 const char *path; 113 void *data; 114 struct nameidata *ndp; 115 struct proc *p; 116 { 117 int error = 0; 118 size_t size; 119 struct kernfs_mount *fmp; 120 struct vnode *rvp; 121 122 #ifdef KERNFS_DIAGNOSTIC 123 printf("kernfs_mount(mp = %p)\n", mp); 124 #endif 125 126 /* 127 * Update is a no-op 128 */ 129 if (mp->mnt_flag & MNT_UPDATE) 130 return (EOPNOTSUPP); 131 132 error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp); 133 if (error) 134 return (error); 135 136 MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount), 137 M_MISCFSMNT, M_WAITOK); 138 rvp->v_type = VDIR; 139 rvp->v_flag |= VROOT; 140 #ifdef KERNFS_DIAGNOSTIC 141 printf("kernfs_mount: root vp = %p\n", rvp); 142 #endif 143 fmp->kf_root = rvp; 144 mp->mnt_flag |= MNT_LOCAL; 145 mp->mnt_data = (qaddr_t)fmp; 146 vfs_getnewfsid(mp, MOUNT_KERNFS); 147 148 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 149 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 150 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 151 bcopy("kernfs", mp->mnt_stat.f_mntfromname, sizeof("kernfs")); 152 #ifdef KERNFS_DIAGNOSTIC 153 printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname); 154 #endif 155 156 kernfs_get_rrootdev(); 157 return (0); 158 } 159 160 int 161 kernfs_start(mp, flags, p) 162 struct mount *mp; 163 int flags; 164 struct proc *p; 165 { 166 167 return (0); 168 } 169 170 int 171 kernfs_unmount(mp, mntflags, p) 172 struct mount *mp; 173 int mntflags; 174 struct proc *p; 175 { 176 int error; 177 int flags = 0; 178 struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root; 179 180 #ifdef KERNFS_DIAGNOSTIC 181 printf("kernfs_unmount(mp = %p)\n", mp); 182 #endif 183 184 if (mntflags & MNT_FORCE) 185 flags |= FORCECLOSE; 186 187 /* 188 * Clear out buffer cache. I don't think we 189 * ever get anything cached at this level at the 190 * moment, but who knows... 191 */ 192 if (rootvp->v_usecount > 1) 193 return (EBUSY); 194 #ifdef KERNFS_DIAGNOSTIC 195 printf("kernfs_unmount: calling vflush\n"); 196 #endif 197 if ((error = vflush(mp, rootvp, flags)) != 0) 198 return (error); 199 200 #ifdef KERNFS_DIAGNOSTIC 201 vprint("kernfs root", rootvp); 202 #endif 203 /* 204 * Clean out the old root vnode for reuse. 205 */ 206 vrele(rootvp); 207 vgone(rootvp); 208 /* 209 * Finally, throw away the kernfs_mount structure 210 */ 211 free(mp->mnt_data, M_MISCFSMNT); 212 mp->mnt_data = 0; 213 return (0); 214 } 215 216 int 217 kernfs_root(mp, vpp) 218 struct mount *mp; 219 struct vnode **vpp; 220 { 221 struct vnode *vp; 222 223 #ifdef KERNFS_DIAGNOSTIC 224 printf("kernfs_root(mp = %p)\n", mp); 225 #endif 226 227 /* 228 * Return locked reference to root. 229 */ 230 vp = VFSTOKERNFS(mp)->kf_root; 231 VREF(vp); 232 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 233 *vpp = vp; 234 return (0); 235 } 236 237 int 238 kernfs_quotactl(mp, cmd, uid, arg, p) 239 struct mount *mp; 240 int cmd; 241 uid_t uid; 242 caddr_t arg; 243 struct proc *p; 244 { 245 246 return (EOPNOTSUPP); 247 } 248 249 int 250 kernfs_statfs(mp, sbp, p) 251 struct mount *mp; 252 struct statfs *sbp; 253 struct proc *p; 254 { 255 256 #ifdef KERNFS_DIAGNOSTIC 257 printf("kernfs_statfs(mp = %p)\n", mp); 258 #endif 259 260 sbp->f_bsize = DEV_BSIZE; 261 sbp->f_iosize = DEV_BSIZE; 262 sbp->f_blocks = 2; /* 1K to keep df happy */ 263 sbp->f_bfree = 0; 264 sbp->f_bavail = 0; 265 sbp->f_files = 0; 266 sbp->f_ffree = 0; 267 #ifdef COMPAT_09 268 sbp->f_type = 7; 269 #else 270 sbp->f_type = 0; 271 #endif 272 if (sbp != &mp->mnt_stat) { 273 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 274 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 275 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 276 } 277 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 278 return (0); 279 } 280 281 /*ARGSUSED*/ 282 int 283 kernfs_sync(mp, waitfor, uc, p) 284 struct mount *mp; 285 int waitfor; 286 struct ucred *uc; 287 struct proc *p; 288 { 289 290 return (0); 291 } 292 293 /* 294 * Kernfs flat namespace lookup. 295 * Currently unsupported. 296 */ 297 int 298 kernfs_vget(mp, ino, vpp) 299 struct mount *mp; 300 ino_t ino; 301 struct vnode **vpp; 302 { 303 304 return (EOPNOTSUPP); 305 } 306 307 /*ARGSUSED*/ 308 int 309 kernfs_fhtovp(mp, fhp, mb, vpp, what, anon) 310 struct mount *mp; 311 struct fid *fhp; 312 struct mbuf *mb; 313 struct vnode **vpp; 314 int *what; 315 struct ucred **anon; 316 { 317 318 return (EOPNOTSUPP); 319 } 320 321 /*ARGSUSED*/ 322 int 323 kernfs_vptofh(vp, fhp) 324 struct vnode *vp; 325 struct fid *fhp; 326 { 327 328 return (EOPNOTSUPP); 329 } 330 331 int 332 kernfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 333 int *name; 334 u_int namelen; 335 void *oldp; 336 size_t *oldlenp; 337 void *newp; 338 size_t newlen; 339 struct proc *p; 340 { 341 return (EOPNOTSUPP); 342 } 343 344 extern struct vnodeopv_desc kernfs_vnodeop_opv_desc; 345 346 struct vnodeopv_desc *kernfs_vnodeopv_descs[] = { 347 &kernfs_vnodeop_opv_desc, 348 NULL, 349 }; 350 351 struct vfsops kernfs_vfsops = { 352 MOUNT_KERNFS, 353 kernfs_mount, 354 kernfs_start, 355 kernfs_unmount, 356 kernfs_root, 357 kernfs_quotactl, 358 kernfs_statfs, 359 kernfs_sync, 360 kernfs_vget, 361 kernfs_fhtovp, 362 kernfs_vptofh, 363 kernfs_init, 364 kernfs_sysctl, 365 NULL, /* vfs_mountroot */ 366 kernfs_vnodeopv_descs, 367 }; 368
Indexes created Mon Sep 22 13:09:51 GMT 2025