kernfs_vfsops.c revision 1.39.2.7
1 /* $NetBSD: kernfs_vfsops.c,v 1.39.2.7 2002/10/18 02:45:03 nathanw 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 1.39.2.7 2002/10/18 02:45:03 nathanw 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 if (mp->mnt_flag & MNT_GETARGS) 142 return 0; 143 /* 144 * Update is a no-op 145 */ 146 if (mp->mnt_flag & MNT_UPDATE) 147 return (EOPNOTSUPP); 148 149 error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp); 150 if (error) 151 return (error); 152 153 MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount), 154 M_MISCFSMNT, M_WAITOK); 155 rvp->v_type = VDIR; 156 rvp->v_flag |= VROOT; 157 #ifdef KERNFS_DIAGNOSTIC 158 printf("kernfs_mount: root vp = %p\n", rvp); 159 #endif 160 fmp->kf_root = rvp; 161 mp->mnt_flag |= MNT_LOCAL; 162 mp->mnt_data = fmp; 163 vfs_getnewfsid(mp); 164 165 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 166 memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size); 167 memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN); 168 memcpy(mp->mnt_stat.f_mntfromname, "kernfs", sizeof("kernfs")); 169 #ifdef KERNFS_DIAGNOSTIC 170 printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname); 171 #endif 172 173 kernfs_get_rrootdev(); 174 return (0); 175 } 176 177 int 178 kernfs_start(mp, flags, p) 179 struct mount *mp; 180 int flags; 181 struct proc *p; 182 { 183 184 return (0); 185 } 186 187 int 188 kernfs_unmount(mp, mntflags, p) 189 struct mount *mp; 190 int mntflags; 191 struct proc *p; 192 { 193 int error; 194 int flags = 0; 195 struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root; 196 197 #ifdef KERNFS_DIAGNOSTIC 198 printf("kernfs_unmount(mp = %p)\n", mp); 199 #endif 200 201 if (mntflags & MNT_FORCE) 202 flags |= FORCECLOSE; 203 204 /* 205 * Clear out buffer cache. I don't think we 206 * ever get anything cached at this level at the 207 * moment, but who knows... 208 */ 209 if (rootvp->v_usecount > 1) 210 return (EBUSY); 211 #ifdef KERNFS_DIAGNOSTIC 212 printf("kernfs_unmount: calling vflush\n"); 213 #endif 214 if ((error = vflush(mp, rootvp, flags)) != 0) 215 return (error); 216 217 #ifdef KERNFS_DIAGNOSTIC 218 vprint("kernfs root", rootvp); 219 #endif 220 /* 221 * Clean out the old root vnode for reuse. 222 */ 223 vrele(rootvp); 224 vgone(rootvp); 225 /* 226 * Finally, throw away the kernfs_mount structure 227 */ 228 free(mp->mnt_data, M_MISCFSMNT); 229 mp->mnt_data = 0; 230 return (0); 231 } 232 233 int 234 kernfs_root(mp, vpp) 235 struct mount *mp; 236 struct vnode **vpp; 237 { 238 struct vnode *vp; 239 240 #ifdef KERNFS_DIAGNOSTIC 241 printf("kernfs_root(mp = %p)\n", mp); 242 #endif 243 244 /* 245 * Return locked reference to root. 246 */ 247 vp = VFSTOKERNFS(mp)->kf_root; 248 VREF(vp); 249 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 250 *vpp = vp; 251 return (0); 252 } 253 254 int 255 kernfs_quotactl(mp, cmd, uid, arg, p) 256 struct mount *mp; 257 int cmd; 258 uid_t uid; 259 caddr_t arg; 260 struct proc *p; 261 { 262 263 return (EOPNOTSUPP); 264 } 265 266 int 267 kernfs_statfs(mp, sbp, p) 268 struct mount *mp; 269 struct statfs *sbp; 270 struct proc *p; 271 { 272 273 #ifdef KERNFS_DIAGNOSTIC 274 printf("kernfs_statfs(mp = %p)\n", mp); 275 #endif 276 277 sbp->f_bsize = DEV_BSIZE; 278 sbp->f_iosize = DEV_BSIZE; 279 sbp->f_blocks = 2; /* 1K to keep df happy */ 280 sbp->f_bfree = 0; 281 sbp->f_bavail = 0; 282 sbp->f_files = 0; 283 sbp->f_ffree = 0; 284 #ifdef COMPAT_09 285 sbp->f_type = 7; 286 #else 287 sbp->f_type = 0; 288 #endif 289 if (sbp != &mp->mnt_stat) { 290 memcpy(&sbp->f_fsid, &mp->mnt_stat.f_fsid, sizeof(sbp->f_fsid)); 291 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 292 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 293 } 294 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 295 return (0); 296 } 297 298 /*ARGSUSED*/ 299 int 300 kernfs_sync(mp, waitfor, uc, p) 301 struct mount *mp; 302 int waitfor; 303 struct ucred *uc; 304 struct proc *p; 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, p) 359 int *name; 360 u_int namelen; 361 void *oldp; 362 size_t *oldlenp; 363 void *newp; 364 size_t newlen; 365 struct proc *p; 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 Mon Sep 29 03:10:08 GMT 2025