kernfs_vfsops.c revision 1.43.8.2
1 /* $NetBSD: kernfs_vfsops.c,v 1.43.8.2 2002/08/29 05:23:22 gehenna 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 1.43.8.2 2002/08/29 05:23:22 gehenna 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 dev_t rrootdev = NODEV; 65 66 void kernfs_init __P((void)); 67 void kernfs_done __P((void)); 68 void kernfs_get_rrootdev __P((void)); 69 int kernfs_mount __P((struct mount *, const char *, void *, 70 struct nameidata *, struct proc *)); 71 int kernfs_start __P((struct mount *, int, struct proc *)); 72 int kernfs_unmount __P((struct mount *, int, struct proc *)); 73 int kernfs_root __P((struct mount *, struct vnode **)); 74 int kernfs_statfs __P((struct mount *, struct statfs *, struct proc *)); 75 int kernfs_quotactl __P((struct mount *, int, uid_t, caddr_t, 76 struct proc *)); 77 int kernfs_sync __P((struct mount *, int, struct ucred *, struct proc *)); 78 int kernfs_vget __P((struct mount *, ino_t, struct vnode **)); 79 int kernfs_fhtovp __P((struct mount *, struct fid *, struct vnode **)); 80 int kernfs_checkexp __P((struct mount *, struct mbuf *, int *, 81 struct ucred **)); 82 int kernfs_vptofh __P((struct vnode *, struct fid *)); 83 int kernfs_sysctl __P((int *, u_int, void *, size_t *, void *, size_t, 84 struct proc *)); 85 86 void 87 kernfs_init() 88 { 89 } 90 91 void 92 kernfs_done() 93 { 94 } 95 96 void 97 kernfs_get_rrootdev() 98 { 99 static int tried = 0; 100 101 if (tried) { 102 /* Already did it once. */ 103 return; 104 } 105 tried = 1; 106 107 if (rootdev == NODEV) 108 return; 109 rrootdev = devsw_blk2chr(rootdev); 110 if (rrootdev != NODEV) { 111 #ifdef KERNFS_DIAGNOSTIC 112 printf("kernfs_mount: rootdev = %u.%u; rrootdev = %u.%u\n", 113 major(rootdev), minor(rootdev), major(rrootdev), minor(rrootdev)); 114 #endif 115 return; 116 } 117 rrootdev = NODEV; 118 printf("kernfs_get_rrootdev: no raw root device\n"); 119 } 120 121 /* 122 * Mount the Kernel params filesystem 123 */ 124 int 125 kernfs_mount(mp, path, data, ndp, p) 126 struct mount *mp; 127 const char *path; 128 void *data; 129 struct nameidata *ndp; 130 struct proc *p; 131 { 132 int error = 0; 133 size_t size; 134 struct kernfs_mount *fmp; 135 struct vnode *rvp; 136 137 #ifdef KERNFS_DIAGNOSTIC 138 printf("kernfs_mount(mp = %p)\n", mp); 139 #endif 140 141 /* 142 * Update is a no-op 143 */ 144 if (mp->mnt_flag & MNT_UPDATE) 145 return (EOPNOTSUPP); 146 147 error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp); 148 if (error) 149 return (error); 150 151 MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount), 152 M_MISCFSMNT, M_WAITOK); 153 rvp->v_type = VDIR; 154 rvp->v_flag |= VROOT; 155 #ifdef KERNFS_DIAGNOSTIC 156 printf("kernfs_mount: root vp = %p\n", rvp); 157 #endif 158 fmp->kf_root = rvp; 159 mp->mnt_flag |= MNT_LOCAL; 160 mp->mnt_data = fmp; 161 vfs_getnewfsid(mp); 162 163 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 164 memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size); 165 memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN); 166 memcpy(mp->mnt_stat.f_mntfromname, "kernfs", sizeof("kernfs")); 167 #ifdef KERNFS_DIAGNOSTIC 168 printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname); 169 #endif 170 171 kernfs_get_rrootdev(); 172 return (0); 173 } 174 175 int 176 kernfs_start(mp, flags, p) 177 struct mount *mp; 178 int flags; 179 struct proc *p; 180 { 181 182 return (0); 183 } 184 185 int 186 kernfs_unmount(mp, mntflags, p) 187 struct mount *mp; 188 int mntflags; 189 struct proc *p; 190 { 191 int error; 192 int flags = 0; 193 struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root; 194 195 #ifdef KERNFS_DIAGNOSTIC 196 printf("kernfs_unmount(mp = %p)\n", mp); 197 #endif 198 199 if (mntflags & MNT_FORCE) 200 flags |= FORCECLOSE; 201 202 /* 203 * Clear out buffer cache. I don't think we 204 * ever get anything cached at this level at the 205 * moment, but who knows... 206 */ 207 if (rootvp->v_usecount > 1) 208 return (EBUSY); 209 #ifdef KERNFS_DIAGNOSTIC 210 printf("kernfs_unmount: calling vflush\n"); 211 #endif 212 if ((error = vflush(mp, rootvp, flags)) != 0) 213 return (error); 214 215 #ifdef KERNFS_DIAGNOSTIC 216 vprint("kernfs root", rootvp); 217 #endif 218 /* 219 * Clean out the old root vnode for reuse. 220 */ 221 vrele(rootvp); 222 vgone(rootvp); 223 /* 224 * Finally, throw away the kernfs_mount structure 225 */ 226 free(mp->mnt_data, M_MISCFSMNT); 227 mp->mnt_data = 0; 228 return (0); 229 } 230 231 int 232 kernfs_root(mp, vpp) 233 struct mount *mp; 234 struct vnode **vpp; 235 { 236 struct vnode *vp; 237 238 #ifdef KERNFS_DIAGNOSTIC 239 printf("kernfs_root(mp = %p)\n", mp); 240 #endif 241 242 /* 243 * Return locked reference to root. 244 */ 245 vp = VFSTOKERNFS(mp)->kf_root; 246 VREF(vp); 247 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 248 *vpp = vp; 249 return (0); 250 } 251 252 int 253 kernfs_quotactl(mp, cmd, uid, arg, p) 254 struct mount *mp; 255 int cmd; 256 uid_t uid; 257 caddr_t arg; 258 struct proc *p; 259 { 260 261 return (EOPNOTSUPP); 262 } 263 264 int 265 kernfs_statfs(mp, sbp, p) 266 struct mount *mp; 267 struct statfs *sbp; 268 struct proc *p; 269 { 270 271 #ifdef KERNFS_DIAGNOSTIC 272 printf("kernfs_statfs(mp = %p)\n", mp); 273 #endif 274 275 sbp->f_bsize = DEV_BSIZE; 276 sbp->f_iosize = DEV_BSIZE; 277 sbp->f_blocks = 2; /* 1K to keep df happy */ 278 sbp->f_bfree = 0; 279 sbp->f_bavail = 0; 280 sbp->f_files = 0; 281 sbp->f_ffree = 0; 282 #ifdef COMPAT_09 283 sbp->f_type = 7; 284 #else 285 sbp->f_type = 0; 286 #endif 287 if (sbp != &mp->mnt_stat) { 288 memcpy(&sbp->f_fsid, &mp->mnt_stat.f_fsid, sizeof(sbp->f_fsid)); 289 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 290 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 291 } 292 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 293 return (0); 294 } 295 296 /*ARGSUSED*/ 297 int 298 kernfs_sync(mp, waitfor, uc, p) 299 struct mount *mp; 300 int waitfor; 301 struct ucred *uc; 302 struct proc *p; 303 { 304 305 return (0); 306 } 307 308 /* 309 * Kernfs flat namespace lookup. 310 * Currently unsupported. 311 */ 312 int 313 kernfs_vget(mp, ino, vpp) 314 struct mount *mp; 315 ino_t ino; 316 struct vnode **vpp; 317 { 318 319 return (EOPNOTSUPP); 320 } 321 322 /*ARGSUSED*/ 323 int 324 kernfs_fhtovp(mp, fhp, vpp) 325 struct mount *mp; 326 struct fid *fhp; 327 struct vnode **vpp; 328 { 329 330 return (EOPNOTSUPP); 331 } 332 333 /*ARGSUSED*/ 334 int 335 kernfs_checkexp(mp, mb, what, anon) 336 struct mount *mp; 337 struct mbuf *mb; 338 int *what; 339 struct ucred **anon; 340 { 341 342 return (EOPNOTSUPP); 343 } 344 345 /*ARGSUSED*/ 346 int 347 kernfs_vptofh(vp, fhp) 348 struct vnode *vp; 349 struct fid *fhp; 350 { 351 352 return (EOPNOTSUPP); 353 } 354 355 int 356 kernfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 357 int *name; 358 u_int namelen; 359 void *oldp; 360 size_t *oldlenp; 361 void *newp; 362 size_t newlen; 363 struct proc *p; 364 { 365 return (EOPNOTSUPP); 366 } 367 368 extern const struct vnodeopv_desc kernfs_vnodeop_opv_desc; 369 370 const struct vnodeopv_desc * const kernfs_vnodeopv_descs[] = { 371 &kernfs_vnodeop_opv_desc, 372 NULL, 373 }; 374 375 struct vfsops kernfs_vfsops = { 376 MOUNT_KERNFS, 377 kernfs_mount, 378 kernfs_start, 379 kernfs_unmount, 380 kernfs_root, 381 kernfs_quotactl, 382 kernfs_statfs, 383 kernfs_sync, 384 kernfs_vget, 385 kernfs_fhtovp, 386 kernfs_vptofh, 387 kernfs_init, 388 NULL, 389 kernfs_done, 390 kernfs_sysctl, 391 NULL, /* vfs_mountroot */ 392 kernfs_checkexp, 393 kernfs_vnodeopv_descs, 394 }; 395
Indexes created Mon Sep 29 03:10:08 GMT 2025