kernfs_vfsops.c revision 1.35
1 /* $NetBSD: kernfs_vfsops.c,v 1.35 1999/02/26 23:44:45 wrstuden 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_get_rrootdev __P((void)); 66 int kernfs_mount __P((struct mount *, const char *, void *, 67 struct nameidata *, struct proc *)); 68 int kernfs_start __P((struct mount *, int, struct proc *)); 69 int kernfs_unmount __P((struct mount *, int, struct proc *)); 70 int kernfs_root __P((struct mount *, struct vnode **)); 71 int kernfs_statfs __P((struct mount *, struct statfs *, struct proc *)); 72 int kernfs_quotactl __P((struct mount *, int, uid_t, caddr_t, 73 struct proc *)); 74 int kernfs_sync __P((struct mount *, int, struct ucred *, struct proc *)); 75 int kernfs_vget __P((struct mount *, ino_t, struct vnode **)); 76 int kernfs_fhtovp __P((struct mount *, struct fid *, struct vnode **)); 77 int kernfs_checkexp __P((struct mount *, struct mbuf *, int *, 78 struct ucred **)); 79 int kernfs_vptofh __P((struct vnode *, struct fid *)); 80 int kernfs_sysctl __P((int *, u_int, void *, size_t *, void *, size_t, 81 struct proc *)); 82 83 void 84 kernfs_init() 85 { 86 } 87 88 void 89 kernfs_get_rrootdev() 90 { 91 static int tried = 0; 92 int cmaj; 93 94 if (tried) { 95 /* Already did it once. */ 96 return; 97 } 98 tried = 1; 99 100 if (rootdev == NODEV) 101 return; 102 for (cmaj = 0; cmaj < nchrdev; cmaj++) { 103 rrootdev = makedev(cmaj, minor(rootdev)); 104 if (chrtoblk(rrootdev) == rootdev) 105 return; 106 } 107 rrootdev = NODEV; 108 printf("kernfs_get_rrootdev: no raw root device\n"); 109 } 110 111 /* 112 * Mount the Kernel params filesystem 113 */ 114 int 115 kernfs_mount(mp, path, data, ndp, p) 116 struct mount *mp; 117 const char *path; 118 void *data; 119 struct nameidata *ndp; 120 struct proc *p; 121 { 122 int error = 0; 123 size_t size; 124 struct kernfs_mount *fmp; 125 struct vnode *rvp; 126 127 #ifdef KERNFS_DIAGNOSTIC 128 printf("kernfs_mount(mp = %p)\n", mp); 129 #endif 130 131 /* 132 * Update is a no-op 133 */ 134 if (mp->mnt_flag & MNT_UPDATE) 135 return (EOPNOTSUPP); 136 137 error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp); 138 if (error) 139 return (error); 140 141 MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount), 142 M_MISCFSMNT, M_WAITOK); 143 rvp->v_type = VDIR; 144 rvp->v_flag |= VROOT; 145 #ifdef KERNFS_DIAGNOSTIC 146 printf("kernfs_mount: root vp = %p\n", rvp); 147 #endif 148 fmp->kf_root = rvp; 149 mp->mnt_flag |= MNT_LOCAL; 150 mp->mnt_data = (qaddr_t)fmp; 151 vfs_getnewfsid(mp, MOUNT_KERNFS); 152 153 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 154 memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size); 155 memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN); 156 memcpy(mp->mnt_stat.f_mntfromname, "kernfs", sizeof("kernfs")); 157 #ifdef KERNFS_DIAGNOSTIC 158 printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname); 159 #endif 160 161 kernfs_get_rrootdev(); 162 return (0); 163 } 164 165 int 166 kernfs_start(mp, flags, p) 167 struct mount *mp; 168 int flags; 169 struct proc *p; 170 { 171 172 return (0); 173 } 174 175 int 176 kernfs_unmount(mp, mntflags, p) 177 struct mount *mp; 178 int mntflags; 179 struct proc *p; 180 { 181 int error; 182 int flags = 0; 183 struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root; 184 185 #ifdef KERNFS_DIAGNOSTIC 186 printf("kernfs_unmount(mp = %p)\n", mp); 187 #endif 188 189 if (mntflags & MNT_FORCE) 190 flags |= FORCECLOSE; 191 192 /* 193 * Clear out buffer cache. I don't think we 194 * ever get anything cached at this level at the 195 * moment, but who knows... 196 */ 197 if (rootvp->v_usecount > 1) 198 return (EBUSY); 199 #ifdef KERNFS_DIAGNOSTIC 200 printf("kernfs_unmount: calling vflush\n"); 201 #endif 202 if ((error = vflush(mp, rootvp, flags)) != 0) 203 return (error); 204 205 #ifdef KERNFS_DIAGNOSTIC 206 vprint("kernfs root", rootvp); 207 #endif 208 /* 209 * Clean out the old root vnode for reuse. 210 */ 211 vrele(rootvp); 212 vgone(rootvp); 213 /* 214 * Finally, throw away the kernfs_mount structure 215 */ 216 free(mp->mnt_data, M_MISCFSMNT); 217 mp->mnt_data = 0; 218 return (0); 219 } 220 221 int 222 kernfs_root(mp, vpp) 223 struct mount *mp; 224 struct vnode **vpp; 225 { 226 struct vnode *vp; 227 228 #ifdef KERNFS_DIAGNOSTIC 229 printf("kernfs_root(mp = %p)\n", mp); 230 #endif 231 232 /* 233 * Return locked reference to root. 234 */ 235 vp = VFSTOKERNFS(mp)->kf_root; 236 VREF(vp); 237 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 238 *vpp = vp; 239 return (0); 240 } 241 242 int 243 kernfs_quotactl(mp, cmd, uid, arg, p) 244 struct mount *mp; 245 int cmd; 246 uid_t uid; 247 caddr_t arg; 248 struct proc *p; 249 { 250 251 return (EOPNOTSUPP); 252 } 253 254 int 255 kernfs_statfs(mp, sbp, p) 256 struct mount *mp; 257 struct statfs *sbp; 258 struct proc *p; 259 { 260 261 #ifdef KERNFS_DIAGNOSTIC 262 printf("kernfs_statfs(mp = %p)\n", mp); 263 #endif 264 265 sbp->f_bsize = DEV_BSIZE; 266 sbp->f_iosize = DEV_BSIZE; 267 sbp->f_blocks = 2; /* 1K to keep df happy */ 268 sbp->f_bfree = 0; 269 sbp->f_bavail = 0; 270 sbp->f_files = 0; 271 sbp->f_ffree = 0; 272 #ifdef COMPAT_09 273 sbp->f_type = 7; 274 #else 275 sbp->f_type = 0; 276 #endif 277 if (sbp != &mp->mnt_stat) { 278 memcpy(&sbp->f_fsid, &mp->mnt_stat.f_fsid, sizeof(sbp->f_fsid)); 279 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 280 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 281 } 282 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 283 return (0); 284 } 285 286 /*ARGSUSED*/ 287 int 288 kernfs_sync(mp, waitfor, uc, p) 289 struct mount *mp; 290 int waitfor; 291 struct ucred *uc; 292 struct proc *p; 293 { 294 295 return (0); 296 } 297 298 /* 299 * Kernfs flat namespace lookup. 300 * Currently unsupported. 301 */ 302 int 303 kernfs_vget(mp, ino, vpp) 304 struct mount *mp; 305 ino_t ino; 306 struct vnode **vpp; 307 { 308 309 return (EOPNOTSUPP); 310 } 311 312 /*ARGSUSED*/ 313 int 314 kernfs_fhtovp(mp, fhp, vpp) 315 struct mount *mp; 316 struct fid *fhp; 317 struct vnode **vpp; 318 { 319 320 return (EOPNOTSUPP); 321 } 322 323 /*ARGSUSED*/ 324 int 325 kernfs_checkexp(mp, mb, what, anon) 326 struct mount *mp; 327 struct mbuf *mb; 328 int *what; 329 struct ucred **anon; 330 { 331 332 return (EOPNOTSUPP); 333 } 334 335 /*ARGSUSED*/ 336 int 337 kernfs_vptofh(vp, fhp) 338 struct vnode *vp; 339 struct fid *fhp; 340 { 341 342 return (EOPNOTSUPP); 343 } 344 345 int 346 kernfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 347 int *name; 348 u_int namelen; 349 void *oldp; 350 size_t *oldlenp; 351 void *newp; 352 size_t newlen; 353 struct proc *p; 354 { 355 return (EOPNOTSUPP); 356 } 357 358 extern struct vnodeopv_desc kernfs_vnodeop_opv_desc; 359 360 struct vnodeopv_desc *kernfs_vnodeopv_descs[] = { 361 &kernfs_vnodeop_opv_desc, 362 NULL, 363 }; 364 365 struct vfsops kernfs_vfsops = { 366 MOUNT_KERNFS, 367 kernfs_mount, 368 kernfs_start, 369 kernfs_unmount, 370 kernfs_root, 371 kernfs_quotactl, 372 kernfs_statfs, 373 kernfs_sync, 374 kernfs_vget, 375 kernfs_fhtovp, 376 kernfs_vptofh, 377 kernfs_init, 378 kernfs_sysctl, 379 NULL, /* vfs_mountroot */ 380 kernfs_checkexp, 381 kernfs_vnodeopv_descs, 382 }; 383
Indexes created Mon Sep 22 13:09:51 GMT 2025