kernfs_vfsops.c revision 1.50
1 /* $NetBSD: kernfs_vfsops.c,v 1.50 2003/06/28 14:22:02 darrenr 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/cdefs.h> 46 __KERNEL_RCSID(0, "$NetBSD: kernfs_vfsops.c,v 1.50 2003/06/28 14:22:02 darrenr Exp $"); 47 48 #if defined(_KERNEL_OPT) 49 #include "opt_compat_netbsd.h" 50 #endif 51 52 #include <sys/param.h> 53 #include <sys/systm.h> 54 #include <sys/conf.h> 55 #include <sys/proc.h> 56 #include <sys/vnode.h> 57 #include <sys/mount.h> 58 #include <sys/namei.h> 59 #include <sys/malloc.h> 60 61 #include <miscfs/specfs/specdev.h> 62 #include <miscfs/kernfs/kernfs.h> 63 64 MALLOC_DEFINE(M_KERNFSMNT, "kernfs mount", "kernfs mount structures"); 65 66 dev_t rrootdev = NODEV; 67 68 void kernfs_init __P((void)); 69 void kernfs_done __P((void)); 70 void kernfs_get_rrootdev __P((void)); 71 int kernfs_mount __P((struct mount *, const char *, void *, 72 struct nameidata *, struct lwp *)); 73 int kernfs_start __P((struct mount *, int, struct lwp *)); 74 int kernfs_unmount __P((struct mount *, int, struct lwp *)); 75 int kernfs_root __P((struct mount *, struct vnode **, struct lwp *)); 76 int kernfs_statfs __P((struct mount *, struct statfs *, struct lwp *)); 77 int kernfs_quotactl __P((struct mount *, int, uid_t, caddr_t, 78 struct lwp *)); 79 int kernfs_sync __P((struct mount *, int, struct ucred *, struct lwp *)); 80 int kernfs_vget __P((struct mount *, ino_t, struct vnode **, struct lwp *)); 81 int kernfs_fhtovp __P((struct mount *, struct fid *, struct vnode **, 82 struct lwp *)); 83 int kernfs_checkexp __P((struct mount *, struct mbuf *, int *, 84 struct ucred **)); 85 int kernfs_vptofh __P((struct vnode *, struct fid *)); 86 int kernfs_sysctl __P((int *, u_int, void *, size_t *, void *, size_t, 87 struct lwp *)); 88 89 void 90 kernfs_init() 91 { 92 #ifdef _LKM 93 malloc_type_attach(M_KERNFSMNT); 94 #endif 95 } 96 97 void 98 kernfs_done() 99 { 100 #ifdef _LKM 101 malloc_type_detach(M_KERNFSMNT); 102 #endif 103 } 104 105 void 106 kernfs_get_rrootdev() 107 { 108 static int tried = 0; 109 110 if (tried) { 111 /* Already did it once. */ 112 return; 113 } 114 tried = 1; 115 116 if (rootdev == NODEV) 117 return; 118 rrootdev = devsw_blk2chr(rootdev); 119 if (rrootdev != NODEV) { 120 #ifdef KERNFS_DIAGNOSTIC 121 printf("kernfs_mount: rootdev = %u.%u; rrootdev = %u.%u\n", 122 major(rootdev), minor(rootdev), major(rrootdev), minor(rrootdev)); 123 #endif 124 return; 125 } 126 rrootdev = NODEV; 127 printf("kernfs_get_rrootdev: no raw root device\n"); 128 } 129 130 /* 131 * Mount the Kernel params filesystem 132 */ 133 int 134 kernfs_mount(mp, path, data, ndp, l) 135 struct mount *mp; 136 const char *path; 137 void *data; 138 struct nameidata *ndp; 139 struct lwp *l; 140 { 141 int error = 0; 142 struct kernfs_mount *fmp; 143 struct vnode *rvp; 144 145 #ifdef KERNFS_DIAGNOSTIC 146 printf("kernfs_mount(mp = %p)\n", mp); 147 #endif 148 149 if (mp->mnt_flag & MNT_GETARGS) 150 return 0; 151 /* 152 * Update is a no-op 153 */ 154 if (mp->mnt_flag & MNT_UPDATE) 155 return (EOPNOTSUPP); 156 157 error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp); 158 if (error) 159 return (error); 160 161 MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount), 162 M_KERNFSMNT, M_WAITOK); 163 rvp->v_type = VDIR; 164 rvp->v_flag |= VROOT; 165 #ifdef KERNFS_DIAGNOSTIC 166 printf("kernfs_mount: root vp = %p\n", rvp); 167 #endif 168 fmp->kf_root = rvp; 169 mp->mnt_flag |= MNT_LOCAL; 170 mp->mnt_data = fmp; 171 vfs_getnewfsid(mp); 172 173 error = set_statfs_info(path, UIO_USERSPACE, "kernfs", UIO_SYSSPACE, 174 mp, l); 175 #ifdef KERNFS_DIAGNOSTIC 176 printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname); 177 #endif 178 179 kernfs_get_rrootdev(); 180 return error; 181 } 182 183 int 184 kernfs_start(mp, flags, l) 185 struct mount *mp; 186 int flags; 187 struct lwp *l; 188 { 189 190 return (0); 191 } 192 193 int 194 kernfs_unmount(mp, mntflags, l) 195 struct mount *mp; 196 int mntflags; 197 struct lwp *l; 198 { 199 int error; 200 int flags = 0; 201 struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root; 202 203 #ifdef KERNFS_DIAGNOSTIC 204 printf("kernfs_unmount(mp = %p)\n", mp); 205 #endif 206 207 if (mntflags & MNT_FORCE) 208 flags |= FORCECLOSE; 209 210 /* 211 * Clear out buffer cache. I don't think we 212 * ever get anything cached at this level at the 213 * moment, but who knows... 214 */ 215 if (rootvp->v_usecount > 1) 216 return (EBUSY); 217 #ifdef KERNFS_DIAGNOSTIC 218 printf("kernfs_unmount: calling vflush\n"); 219 #endif 220 if ((error = vflush(mp, rootvp, flags)) != 0) 221 return (error); 222 223 #ifdef KERNFS_DIAGNOSTIC 224 vprint("kernfs root", rootvp); 225 #endif 226 /* 227 * Clean out the old root vnode for reuse. 228 */ 229 vrele(rootvp); 230 vgone(rootvp); 231 /* 232 * Finally, throw away the kernfs_mount structure 233 */ 234 free(mp->mnt_data, M_KERNFSMNT); 235 mp->mnt_data = 0; 236 return (0); 237 } 238 239 int 240 kernfs_root(mp, vpp, l) 241 struct mount *mp; 242 struct vnode **vpp; 243 struct lwp *l; 244 { 245 struct vnode *vp; 246 247 #ifdef KERNFS_DIAGNOSTIC 248 printf("kernfs_root(mp = %p)\n", mp); 249 #endif 250 251 /* 252 * Return locked reference to root. 253 */ 254 vp = VFSTOKERNFS(mp)->kf_root; 255 VREF(vp); 256 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 257 *vpp = vp; 258 return (0); 259 } 260 261 int 262 kernfs_quotactl(mp, cmd, uid, arg, l) 263 struct mount *mp; 264 int cmd; 265 uid_t uid; 266 caddr_t arg; 267 struct lwp *l; 268 { 269 270 return (EOPNOTSUPP); 271 } 272 273 int 274 kernfs_statfs(mp, sbp, l) 275 struct mount *mp; 276 struct statfs *sbp; 277 struct lwp *l; 278 { 279 280 #ifdef KERNFS_DIAGNOSTIC 281 printf("kernfs_statfs(mp = %p)\n", mp); 282 #endif 283 284 sbp->f_bsize = DEV_BSIZE; 285 sbp->f_iosize = DEV_BSIZE; 286 sbp->f_blocks = 2; /* 1K to keep df happy */ 287 sbp->f_bfree = 0; 288 sbp->f_bavail = 0; 289 sbp->f_files = 0; 290 sbp->f_ffree = 0; 291 #ifdef COMPAT_09 292 sbp->f_type = 7; 293 #else 294 sbp->f_type = 0; 295 #endif 296 copy_statfs_info(sbp, mp); 297 return (0); 298 } 299 300 /*ARGSUSED*/ 301 int 302 kernfs_sync(mp, waitfor, uc, l) 303 struct mount *mp; 304 int waitfor; 305 struct ucred *uc; 306 struct lwp *l; 307 { 308 309 return (0); 310 } 311 312 /* 313 * Kernfs flat namespace lookup. 314 * Currently unsupported. 315 */ 316 int 317 kernfs_vget(mp, ino, vpp, l) 318 struct mount *mp; 319 ino_t ino; 320 struct vnode **vpp; 321 struct lwp *l; 322 { 323 324 return (EOPNOTSUPP); 325 } 326 327 /*ARGSUSED*/ 328 int 329 kernfs_fhtovp(mp, fhp, vpp, l) 330 struct mount *mp; 331 struct fid *fhp; 332 struct vnode **vpp; 333 struct lwp *l; 334 { 335 336 return (EOPNOTSUPP); 337 } 338 339 /*ARGSUSED*/ 340 int 341 kernfs_checkexp(mp, mb, what, anon) 342 struct mount *mp; 343 struct mbuf *mb; 344 int *what; 345 struct ucred **anon; 346 { 347 348 return (EOPNOTSUPP); 349 } 350 351 /*ARGSUSED*/ 352 int 353 kernfs_vptofh(vp, fhp) 354 struct vnode *vp; 355 struct fid *fhp; 356 { 357 358 return (EOPNOTSUPP); 359 } 360 361 int 362 kernfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, l) 363 int *name; 364 u_int namelen; 365 void *oldp; 366 size_t *oldlenp; 367 void *newp; 368 size_t newlen; 369 struct lwp *l; 370 { 371 return (EOPNOTSUPP); 372 } 373 374 extern const struct vnodeopv_desc kernfs_vnodeop_opv_desc; 375 376 const struct vnodeopv_desc * const kernfs_vnodeopv_descs[] = { 377 &kernfs_vnodeop_opv_desc, 378 NULL, 379 }; 380 381 struct vfsops kernfs_vfsops = { 382 MOUNT_KERNFS, 383 kernfs_mount, 384 kernfs_start, 385 kernfs_unmount, 386 kernfs_root, 387 kernfs_quotactl, 388 kernfs_statfs, 389 kernfs_sync, 390 kernfs_vget, 391 kernfs_fhtovp, 392 kernfs_vptofh, 393 kernfs_init, 394 NULL, 395 kernfs_done, 396 kernfs_sysctl, 397 NULL, /* vfs_mountroot */ 398 kernfs_checkexp, 399 kernfs_vnodeopv_descs, 400 }; 401
Indexes created Thu Sep 25 16:09:42 GMT 2025