kernfs_vfsops.c revision 1.18
1 /* $NetBSD: kernfs_vfsops.c,v 1.18 1994/06/29 06:34:27 cgd Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 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 8.5 (Berkeley) 6/15/94 39 */ 40 41 /* 42 * Kernel params Filesystem 43 */ 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/conf.h> 48 #include <sys/types.h> 49 #include <sys/proc.h> 50 #include <sys/vnode.h> 51 #include <sys/mount.h> 52 #include <sys/namei.h> 53 #include <sys/malloc.h> 54 55 #include <miscfs/specfs/specdev.h> 56 #include <miscfs/kernfs/kernfs.h> 57 58 dev_t rrootdev = NODEV; 59 60 kernfs_init() 61 { 62 63 } 64 65 void 66 kernfs_get_rrootdev() 67 { 68 static int tried = 0; 69 int cmaj; 70 71 if (tried) { 72 /* Already did it once. */ 73 return; 74 } 75 tried = 1; 76 77 if (rootdev == NODEV) 78 return; 79 for (cmaj = 0; cmaj < nchrdev; cmaj++) { 80 rrootdev = makedev(cmaj, minor(rootdev)); 81 if (chrtoblk(rrootdev) == rootdev) 82 return; 83 } 84 rrootdev = NODEV; 85 printf("kernfs_get_rrootdev: no raw root device\n"); 86 } 87 88 /* 89 * Mount the Kernel params filesystem 90 */ 91 kernfs_mount(mp, path, data, ndp, p) 92 struct mount *mp; 93 char *path; 94 caddr_t data; 95 struct nameidata *ndp; 96 struct proc *p; 97 { 98 int error = 0; 99 u_int size; 100 struct kernfs_mount *fmp; 101 struct vnode *rvp; 102 103 #ifdef KERNFS_DIAGNOSTIC 104 printf("kernfs_mount(mp = %x)\n", mp); 105 #endif 106 107 /* 108 * Update is a no-op 109 */ 110 if (mp->mnt_flag & MNT_UPDATE) 111 return (EOPNOTSUPP); 112 113 if (error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp)) 114 return (error); 115 116 MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount), 117 M_MISCFSMNT, M_WAITOK); 118 rvp->v_type = VDIR; 119 rvp->v_flag |= VROOT; 120 #ifdef KERNFS_DIAGNOSTIC 121 printf("kernfs_mount: root vp = %x\n", rvp); 122 #endif 123 fmp->kf_root = rvp; 124 mp->mnt_flag |= MNT_LOCAL; 125 mp->mnt_data = (qaddr_t)fmp; 126 getnewfsid(mp, makefstype(MOUNT_KERNFS)); 127 128 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 129 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 130 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 131 bcopy("kernfs", mp->mnt_stat.f_mntfromname, sizeof("kernfs")); 132 #ifdef KERNFS_DIAGNOSTIC 133 printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname); 134 #endif 135 136 kernfs_get_rrootdev(); 137 return (0); 138 } 139 140 kernfs_start(mp, flags, p) 141 struct mount *mp; 142 int flags; 143 struct proc *p; 144 { 145 146 return (0); 147 } 148 149 kernfs_unmount(mp, mntflags, p) 150 struct mount *mp; 151 int mntflags; 152 struct proc *p; 153 { 154 int error; 155 int flags = 0; 156 extern int doforce; 157 struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root; 158 159 #ifdef KERNFS_DIAGNOSTIC 160 printf("kernfs_unmount(mp = %x)\n", mp); 161 #endif 162 163 if (mntflags & MNT_FORCE) { 164 /* kernfs can never be rootfs so don't check for it */ 165 if (!doforce) 166 return (EINVAL); 167 flags |= FORCECLOSE; 168 } 169 170 /* 171 * Clear out buffer cache. I don't think we 172 * ever get anything cached at this level at the 173 * moment, but who knows... 174 */ 175 if (rootvp->v_usecount > 1) 176 return (EBUSY); 177 #ifdef KERNFS_DIAGNOSTIC 178 printf("kernfs_unmount: calling vflush\n"); 179 #endif 180 if (error = vflush(mp, rootvp, flags)) 181 return (error); 182 183 #ifdef KERNFS_DIAGNOSTIC 184 vprint("kernfs root", rootvp); 185 #endif 186 /* 187 * Clean out the old root vnode for reuse. 188 */ 189 vrele(rootvp); 190 vgone(rootvp); 191 /* 192 * Finally, throw away the kernfs_mount structure 193 */ 194 free(mp->mnt_data, M_MISCFSMNT); 195 mp->mnt_data = 0; 196 return (0); 197 } 198 199 kernfs_root(mp, vpp) 200 struct mount *mp; 201 struct vnode **vpp; 202 { 203 struct vnode *vp; 204 205 #ifdef KERNFS_DIAGNOSTIC 206 printf("kernfs_root(mp = %x)\n", mp); 207 #endif 208 209 /* 210 * Return locked reference to root. 211 */ 212 vp = VFSTOKERNFS(mp)->kf_root; 213 VREF(vp); 214 VOP_LOCK(vp); 215 *vpp = vp; 216 return (0); 217 } 218 219 kernfs_quotactl(mp, cmd, uid, arg, p) 220 struct mount *mp; 221 int cmd; 222 uid_t uid; 223 caddr_t arg; 224 struct proc *p; 225 { 226 227 return (EOPNOTSUPP); 228 } 229 230 kernfs_statfs(mp, sbp, p) 231 struct mount *mp; 232 struct statfs *sbp; 233 struct proc *p; 234 { 235 236 #ifdef KERNFS_DIAGNOSTIC 237 printf("kernfs_statfs(mp = %x)\n", mp); 238 #endif 239 240 #ifdef COMPAT_09 241 sbp->f_type = 7; 242 #else 243 sbp->f_type = 0; 244 #endif 245 sbp->f_flags = 0; 246 sbp->f_bsize = DEV_BSIZE; 247 sbp->f_iosize = DEV_BSIZE; 248 sbp->f_blocks = 2; /* 1K to keep df happy */ 249 sbp->f_bfree = 0; 250 sbp->f_bavail = 0; 251 sbp->f_files = 0; 252 sbp->f_ffree = 0; 253 if (sbp != &mp->mnt_stat) { 254 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 255 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 256 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 257 } 258 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 259 sbp->f_fstypename[MFSNAMELEN] = '\0'; 260 return (0); 261 } 262 263 kernfs_sync(mp, waitfor) 264 struct mount *mp; 265 int waitfor; 266 { 267 268 return (0); 269 } 270 271 /* 272 * Kernfs flat namespace lookup. 273 * Currently unsupported. 274 */ 275 kernfs_vget(mp, ino, vpp) 276 struct mount *mp; 277 ino_t ino; 278 struct vnode **vpp; 279 { 280 281 return (EOPNOTSUPP); 282 } 283 284 285 kernfs_fhtovp(mp, fhp, setgen, vpp) 286 struct mount *mp; 287 struct fid *fhp; 288 int setgen; 289 struct vnode **vpp; 290 { 291 292 return (EOPNOTSUPP); 293 } 294 295 kernfs_vptofh(vp, fhp) 296 struct vnode *vp; 297 struct fid *fhp; 298 { 299 300 return (EOPNOTSUPP); 301 } 302 303 struct vfsops kernfs_vfsops = { 304 MOUNT_KERNFS, 305 kernfs_mount, 306 kernfs_start, 307 kernfs_unmount, 308 kernfs_root, 309 kernfs_quotactl, 310 kernfs_statfs, 311 kernfs_sync, 312 kernfs_vget, 313 kernfs_fhtovp, 314 kernfs_vptofh, 315 kernfs_init, 316 }; 317
Indexes created Mon Sep 22 10:09:38 GMT 2025