kernfs_vfsops.c revision 1.28
1 /* $NetBSD: kernfs_vfsops.c,v 1.28 1996/10/13 02:21:30 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 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 8.5 (Berkeley) 6/15/94 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 *, char *, caddr_t, struct nameidata *, 63 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 76 /*ARGSUSED*/ 77 void 78 kernfs_init() 79 { 80 } 81 82 void 83 kernfs_get_rrootdev() 84 { 85 static int tried = 0; 86 int cmaj; 87 88 if (tried) { 89 /* Already did it once. */ 90 return; 91 } 92 tried = 1; 93 94 if (rootdev == NODEV) 95 return; 96 for (cmaj = 0; cmaj < nchrdev; cmaj++) { 97 rrootdev = makedev(cmaj, minor(rootdev)); 98 if (chrtoblk(rrootdev) == rootdev) 99 return; 100 } 101 rrootdev = NODEV; 102 printf("kernfs_get_rrootdev: no raw root device\n"); 103 } 104 105 /* 106 * Mount the Kernel params filesystem 107 */ 108 int 109 kernfs_mount(mp, path, data, ndp, p) 110 struct mount *mp; 111 char *path; 112 caddr_t data; 113 struct nameidata *ndp; 114 struct proc *p; 115 { 116 int error = 0; 117 size_t size; 118 struct kernfs_mount *fmp; 119 struct vnode *rvp; 120 121 #ifdef KERNFS_DIAGNOSTIC 122 printf("kernfs_mount(mp = %x)\n", mp); 123 #endif 124 125 /* 126 * Update is a no-op 127 */ 128 if (mp->mnt_flag & MNT_UPDATE) 129 return (EOPNOTSUPP); 130 131 error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp); 132 if (error) 133 return (error); 134 135 MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount), 136 M_MISCFSMNT, M_WAITOK); 137 rvp->v_type = VDIR; 138 rvp->v_flag |= VROOT; 139 #ifdef KERNFS_DIAGNOSTIC 140 printf("kernfs_mount: root vp = %x\n", rvp); 141 #endif 142 fmp->kf_root = rvp; 143 mp->mnt_flag |= MNT_LOCAL; 144 mp->mnt_data = (qaddr_t)fmp; 145 getnewfsid(mp, makefstype(MOUNT_KERNFS)); 146 147 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 148 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 149 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 150 bcopy("kernfs", mp->mnt_stat.f_mntfromname, sizeof("kernfs")); 151 #ifdef KERNFS_DIAGNOSTIC 152 printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname); 153 #endif 154 155 kernfs_get_rrootdev(); 156 return (0); 157 } 158 159 int 160 kernfs_start(mp, flags, p) 161 struct mount *mp; 162 int flags; 163 struct proc *p; 164 { 165 166 return (0); 167 } 168 169 int 170 kernfs_unmount(mp, mntflags, p) 171 struct mount *mp; 172 int mntflags; 173 struct proc *p; 174 { 175 int error; 176 int flags = 0; 177 extern int doforce; 178 struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root; 179 180 #ifdef KERNFS_DIAGNOSTIC 181 printf("kernfs_unmount(mp = %x)\n", mp); 182 #endif 183 184 if (mntflags & MNT_FORCE) { 185 /* kernfs can never be rootfs so don't check for it */ 186 if (!doforce) 187 return (EINVAL); 188 flags |= FORCECLOSE; 189 } 190 191 /* 192 * Clear out buffer cache. I don't think we 193 * ever get anything cached at this level at the 194 * moment, but who knows... 195 */ 196 if (rootvp->v_usecount > 1) 197 return (EBUSY); 198 #ifdef KERNFS_DIAGNOSTIC 199 printf("kernfs_unmount: calling vflush\n"); 200 #endif 201 if ((error = vflush(mp, rootvp, flags)) != 0) 202 return (error); 203 204 #ifdef KERNFS_DIAGNOSTIC 205 vprint("kernfs root", rootvp); 206 #endif 207 /* 208 * Clean out the old root vnode for reuse. 209 */ 210 vrele(rootvp); 211 vgone(rootvp); 212 /* 213 * Finally, throw away the kernfs_mount structure 214 */ 215 free(mp->mnt_data, M_MISCFSMNT); 216 mp->mnt_data = 0; 217 return (0); 218 } 219 220 int 221 kernfs_root(mp, vpp) 222 struct mount *mp; 223 struct vnode **vpp; 224 { 225 struct vnode *vp; 226 227 #ifdef KERNFS_DIAGNOSTIC 228 printf("kernfs_root(mp = %x)\n", mp); 229 #endif 230 231 /* 232 * Return locked reference to root. 233 */ 234 vp = VFSTOKERNFS(mp)->kf_root; 235 VREF(vp); 236 VOP_LOCK(vp); 237 *vpp = vp; 238 return (0); 239 } 240 241 int 242 kernfs_quotactl(mp, cmd, uid, arg, p) 243 struct mount *mp; 244 int cmd; 245 uid_t uid; 246 caddr_t arg; 247 struct proc *p; 248 { 249 250 return (EOPNOTSUPP); 251 } 252 253 int 254 kernfs_statfs(mp, sbp, p) 255 struct mount *mp; 256 struct statfs *sbp; 257 struct proc *p; 258 { 259 260 #ifdef KERNFS_DIAGNOSTIC 261 printf("kernfs_statfs(mp = %x)\n", mp); 262 #endif 263 264 #ifdef COMPAT_09 265 sbp->f_type = 7; 266 #else 267 sbp->f_type = 0; 268 #endif 269 sbp->f_bsize = DEV_BSIZE; 270 sbp->f_iosize = DEV_BSIZE; 271 sbp->f_blocks = 2; /* 1K to keep df happy */ 272 sbp->f_bfree = 0; 273 sbp->f_bavail = 0; 274 sbp->f_files = 0; 275 sbp->f_ffree = 0; 276 if (sbp != &mp->mnt_stat) { 277 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 278 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 279 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 280 } 281 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 282 return (0); 283 } 284 285 /*ARGSUSED*/ 286 int 287 kernfs_sync(mp, waitfor, uc, p) 288 struct mount *mp; 289 int waitfor; 290 struct ucred *uc; 291 struct proc *p; 292 { 293 294 return (0); 295 } 296 297 /* 298 * Kernfs flat namespace lookup. 299 * Currently unsupported. 300 */ 301 int 302 kernfs_vget(mp, ino, vpp) 303 struct mount *mp; 304 ino_t ino; 305 struct vnode **vpp; 306 { 307 308 return (EOPNOTSUPP); 309 } 310 311 /*ARGSUSED*/ 312 int 313 kernfs_fhtovp(mp, fhp, mb, vpp, what, anon) 314 struct mount *mp; 315 struct fid *fhp; 316 struct mbuf *mb; 317 struct vnode **vpp; 318 int *what; 319 struct ucred **anon; 320 { 321 322 return (EOPNOTSUPP); 323 } 324 325 /*ARGSUSED*/ 326 int 327 kernfs_vptofh(vp, fhp) 328 struct vnode *vp; 329 struct fid *fhp; 330 { 331 332 return (EOPNOTSUPP); 333 } 334 335 struct vfsops kernfs_vfsops = { 336 MOUNT_KERNFS, 337 kernfs_mount, 338 kernfs_start, 339 kernfs_unmount, 340 kernfs_root, 341 kernfs_quotactl, 342 kernfs_statfs, 343 kernfs_sync, 344 kernfs_vget, 345 kernfs_fhtovp, 346 kernfs_vptofh, 347 kernfs_init, 348 }; 349
Indexes created Mon Sep 22 10:09:38 GMT 2025