kernfs_vfsops.c revision 1.51
1 /* $NetBSD: kernfs_vfsops.c,v 1.51 2003/06/29 18:43:32 thorpej 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 1.51 2003/06/29 18:43:32 thorpej 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 **)); 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 **)); 81 int kernfs_fhtovp __P((struct mount *, struct fid *, struct vnode **)); 82 int kernfs_checkexp __P((struct mount *, struct mbuf *, int *, 83 struct ucred **)); 84 int kernfs_vptofh __P((struct vnode *, struct fid *)); 85 int kernfs_sysctl __P((int *, u_int, void *, size_t *, void *, size_t, 86 struct lwp *)); 87 88 void 89 kernfs_init() 90 { 91 #ifdef _LKM 92 malloc_type_attach(M_KERNFSMNT); 93 #endif 94 } 95 96 void 97 kernfs_done() 98 { 99 #ifdef _LKM 100 malloc_type_detach(M_KERNFSMNT); 101 #endif 102 } 103 104 void 105 kernfs_get_rrootdev() 106 { 107 static int tried = 0; 108 109 if (tried) { 110 /* Already did it once. */ 111 return; 112 } 113 tried = 1; 114 115 if (rootdev == NODEV) 116 return; 117 rrootdev = devsw_blk2chr(rootdev); 118 if (rrootdev != NODEV) { 119 #ifdef KERNFS_DIAGNOSTIC 120 printf("kernfs_mount: rootdev = %u.%u; rrootdev = %u.%u\n", 121 major(rootdev), minor(rootdev), major(rrootdev), minor(rrootdev)); 122 #endif 123 return; 124 } 125 rrootdev = NODEV; 126 printf("kernfs_get_rrootdev: no raw root device\n"); 127 } 128 129 /* 130 * Mount the Kernel params filesystem 131 */ 132 int 133 kernfs_mount(mp, path, data, ndp, l) 134 struct mount *mp; 135 const char *path; 136 void *data; 137 struct nameidata *ndp; 138 struct lwp *l; 139 { 140 int error = 0; 141 struct kernfs_mount *fmp; 142 struct vnode *rvp; 143 144 #ifdef KERNFS_DIAGNOSTIC 145 printf("kernfs_mount(mp = %p)\n", mp); 146 #endif 147 148 if (mp->mnt_flag & MNT_GETARGS) 149 return 0; 150 /* 151 * Update is a no-op 152 */ 153 if (mp->mnt_flag & MNT_UPDATE) 154 return (EOPNOTSUPP); 155 156 error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp); 157 if (error) 158 return (error); 159 160 MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount), 161 M_KERNFSMNT, M_WAITOK); 162 rvp->v_type = VDIR; 163 rvp->v_flag |= VROOT; 164 #ifdef KERNFS_DIAGNOSTIC 165 printf("kernfs_mount: root vp = %p\n", rvp); 166 #endif 167 fmp->kf_root = rvp; 168 mp->mnt_flag |= MNT_LOCAL; 169 mp->mnt_data = fmp; 170 vfs_getnewfsid(mp); 171 172 error = set_statfs_info(path, UIO_USERSPACE, "kernfs", UIO_SYSSPACE, 173 mp, l); 174 #ifdef KERNFS_DIAGNOSTIC 175 printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname); 176 #endif 177 178 kernfs_get_rrootdev(); 179 return error; 180 } 181 182 int 183 kernfs_start(mp, flags, l) 184 struct mount *mp; 185 int flags; 186 struct lwp *l; 187 { 188 189 return (0); 190 } 191 192 int 193 kernfs_unmount(mp, mntflags, l) 194 struct mount *mp; 195 int mntflags; 196 struct lwp *l; 197 { 198 int error; 199 int flags = 0; 200 struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root; 201 202 #ifdef KERNFS_DIAGNOSTIC 203 printf("kernfs_unmount(mp = %p)\n", mp); 204 #endif 205 206 if (mntflags & MNT_FORCE) 207 flags |= FORCECLOSE; 208 209 /* 210 * Clear out buffer cache. I don't think we 211 * ever get anything cached at this level at the 212 * moment, but who knows... 213 */ 214 if (rootvp->v_usecount > 1) 215 return (EBUSY); 216 #ifdef KERNFS_DIAGNOSTIC 217 printf("kernfs_unmount: calling vflush\n"); 218 #endif 219 if ((error = vflush(mp, rootvp, flags)) != 0) 220 return (error); 221 222 #ifdef KERNFS_DIAGNOSTIC 223 vprint("kernfs root", rootvp); 224 #endif 225 /* 226 * Clean out the old root vnode for reuse. 227 */ 228 vrele(rootvp); 229 vgone(rootvp); 230 /* 231 * Finally, throw away the kernfs_mount structure 232 */ 233 free(mp->mnt_data, M_KERNFSMNT); 234 mp->mnt_data = 0; 235 return (0); 236 } 237 238 int 239 kernfs_root(mp, vpp) 240 struct mount *mp; 241 struct vnode **vpp; 242 { 243 struct vnode *vp; 244 245 #ifdef KERNFS_DIAGNOSTIC 246 printf("kernfs_root(mp = %p)\n", mp); 247 #endif 248 249 /* 250 * Return locked reference to root. 251 */ 252 vp = VFSTOKERNFS(mp)->kf_root; 253 VREF(vp); 254 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 255 *vpp = vp; 256 return (0); 257 } 258 259 int 260 kernfs_quotactl(mp, cmd, uid, arg, l) 261 struct mount *mp; 262 int cmd; 263 uid_t uid; 264 caddr_t arg; 265 struct lwp *l; 266 { 267 268 return (EOPNOTSUPP); 269 } 270 271 int 272 kernfs_statfs(mp, sbp, l) 273 struct mount *mp; 274 struct statfs *sbp; 275 struct lwp *l; 276 { 277 278 #ifdef KERNFS_DIAGNOSTIC 279 printf("kernfs_statfs(mp = %p)\n", mp); 280 #endif 281 282 sbp->f_bsize = DEV_BSIZE; 283 sbp->f_iosize = DEV_BSIZE; 284 sbp->f_blocks = 2; /* 1K to keep df happy */ 285 sbp->f_bfree = 0; 286 sbp->f_bavail = 0; 287 sbp->f_files = 0; 288 sbp->f_ffree = 0; 289 #ifdef COMPAT_09 290 sbp->f_type = 7; 291 #else 292 sbp->f_type = 0; 293 #endif 294 copy_statfs_info(sbp, mp); 295 return (0); 296 } 297 298 /*ARGSUSED*/ 299 int 300 kernfs_sync(mp, waitfor, uc, l) 301 struct mount *mp; 302 int waitfor; 303 struct ucred *uc; 304 struct lwp *l; 305 { 306 307 return (0); 308 } 309 310 /* 311 * Kernfs flat namespace lookup. 312 * Currently unsupported. 313 */ 314 int 315 kernfs_vget(mp, ino, vpp) 316 struct mount *mp; 317 ino_t ino; 318 struct vnode **vpp; 319 { 320 321 return (EOPNOTSUPP); 322 } 323 324 /*ARGSUSED*/ 325 int 326 kernfs_fhtovp(mp, fhp, vpp) 327 struct mount *mp; 328 struct fid *fhp; 329 struct vnode **vpp; 330 { 331 332 return (EOPNOTSUPP); 333 } 334 335 /*ARGSUSED*/ 336 int 337 kernfs_checkexp(mp, mb, what, anon) 338 struct mount *mp; 339 struct mbuf *mb; 340 int *what; 341 struct ucred **anon; 342 { 343 344 return (EOPNOTSUPP); 345 } 346 347 /*ARGSUSED*/ 348 int 349 kernfs_vptofh(vp, fhp) 350 struct vnode *vp; 351 struct fid *fhp; 352 { 353 354 return (EOPNOTSUPP); 355 } 356 357 int 358 kernfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, l) 359 int *name; 360 u_int namelen; 361 void *oldp; 362 size_t *oldlenp; 363 void *newp; 364 size_t newlen; 365 struct lwp *l; 366 { 367 return (EOPNOTSUPP); 368 } 369 370 extern const struct vnodeopv_desc kernfs_vnodeop_opv_desc; 371 372 const struct vnodeopv_desc * const kernfs_vnodeopv_descs[] = { 373 &kernfs_vnodeop_opv_desc, 374 NULL, 375 }; 376 377 struct vfsops kernfs_vfsops = { 378 MOUNT_KERNFS, 379 kernfs_mount, 380 kernfs_start, 381 kernfs_unmount, 382 kernfs_root, 383 kernfs_quotactl, 384 kernfs_statfs, 385 kernfs_sync, 386 kernfs_vget, 387 kernfs_fhtovp, 388 kernfs_vptofh, 389 kernfs_init, 390 NULL, 391 kernfs_done, 392 kernfs_sysctl, 393 NULL, /* vfs_mountroot */ 394 kernfs_checkexp, 395 kernfs_vnodeopv_descs, 396 }; 397
Indexes created Tue Sep 23 14:10:03 GMT 2025