kernfs_vfsops.c revision 1.10.2.2
1 1.10.2.2 pk /* 2 1.10.2.2 pk * Copyright (c) 1990, 1992 Jan-Simon Pendry 3 1.10.2.2 pk * All rights reserved. 4 1.10.2.2 pk * 5 1.10.2.2 pk * This code is derived from software contributed to Berkeley by 6 1.10.2.2 pk * Jan-Simon Pendry. 7 1.10.2.2 pk * 8 1.10.2.2 pk * Redistribution and use in source and binary forms, with or without 9 1.10.2.2 pk * modification, are permitted provided that the following conditions 10 1.10.2.2 pk * are met: 11 1.10.2.2 pk * 1. Redistributions of source code must retain the above copyright 12 1.10.2.2 pk * notice, this list of conditions and the following disclaimer. 13 1.10.2.2 pk * 2. Redistributions in binary form must reproduce the above copyright 14 1.10.2.2 pk * notice, this list of conditions and the following disclaimer in the 15 1.10.2.2 pk * documentation and/or other materials provided with the distribution. 16 1.10.2.2 pk * 3. All advertising materials mentioning features or use of this software 17 1.10.2.2 pk * must display the following acknowledgement: 18 1.10.2.2 pk * This product includes software developed by the University of 19 1.10.2.2 pk * California, Berkeley and its contributors. 20 1.10.2.2 pk * 4. Neither the name of the University nor the names of its contributors 21 1.10.2.2 pk * may be used to endorse or promote products derived from this software 22 1.10.2.2 pk * without specific prior written permission. 23 1.10.2.2 pk * 24 1.10.2.2 pk * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 1.10.2.2 pk * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 1.10.2.2 pk * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 1.10.2.2 pk * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 1.10.2.2 pk * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 1.10.2.2 pk * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 1.10.2.2 pk * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 1.10.2.2 pk * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 1.10.2.2 pk * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 1.10.2.2 pk * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 1.10.2.2 pk * SUCH DAMAGE. 35 1.10.2.2 pk * 36 1.10.2.2 pk * $Id: kernfs_vfsops.c,v 1.10.2.2 1993/12/28 16:21:43 pk Exp $ 37 1.10.2.2 pk */ 38 1.10.2.2 pk 39 1.10.2.2 pk /* 40 1.10.2.2 pk * Kernel params Filesystem 41 1.10.2.2 pk */ 42 1.10.2.2 pk 43 1.10.2.2 pk #include <sys/param.h> 44 1.10.2.2 pk #include <sys/systm.h> 45 1.10.2.2 pk #include <sys/time.h> 46 1.10.2.2 pk #include <sys/types.h> 47 1.10.2.2 pk #include <sys/proc.h> 48 1.10.2.2 pk #include <sys/vnode.h> 49 1.10.2.2 pk #include <sys/mount.h> 50 1.10.2.2 pk #include <sys/namei.h> 51 1.10.2.2 pk #include <sys/malloc.h> 52 1.10.2.2 pk #include <sys/conf.h> 53 1.10.2.2 pk 54 1.10.2.2 pk #include <miscfs/kernfs/kernfs.h> 55 1.10.2.2 pk 56 1.10.2.2 pk /* bring in the spec vnodeops for cdevvp */ 57 1.10.2.2 pk extern struct vnodeops spec_vnodeops; 58 1.10.2.2 pk 59 1.10.2.2 pk struct vnode *rrootdevvp; 60 1.10.2.2 pk 61 1.10.2.2 pk kernfs_init() 62 1.10.2.2 pk { 63 1.10.2.2 pk #ifdef KERNFS_DIAGNOSTIC 64 1.10.2.2 pk printf("kernfs_init\n"); /* printed during system boot */ 65 1.10.2.2 pk #endif 66 1.10.2.2 pk 67 1.10.2.2 pk /* DO NOTHING */ 68 1.10.2.2 pk } 69 1.10.2.2 pk 70 1.10.2.2 pk static void 71 1.10.2.2 pk kernfs_rrootdevvp_init() 72 1.10.2.2 pk { 73 1.10.2.2 pk int error, bmaj, cmaj; 74 1.10.2.2 pk 75 1.10.2.2 pk if (rrootdevvp != NULL) /* then we've already done this */ 76 1.10.2.2 pk return; 77 1.10.2.2 pk 78 1.10.2.2 pk error = ENXIO; 79 1.10.2.2 pk bmaj = major(rootdev); 80 1.10.2.2 pk 81 1.10.2.2 pk /* hunt for the raw root device by looking in cdevsw for a matching 82 1.10.2.2 pk * open routine... 83 1.10.2.2 pk */ 84 1.10.2.2 pk for (cmaj = 0; cmaj < nchrdev; cmaj++) { 85 1.10.2.2 pk if (cdevsw[cmaj].d_open == bdevsw[bmaj].d_open) { 86 1.10.2.2 pk dev_t cdev = makedev(cmaj, minor(rootdev)); 87 1.10.2.2 pk error = cdevvp(cdev, &rrootdevvp); 88 1.10.2.2 pk if (!error) 89 1.10.2.2 pk return; 90 1.10.2.2 pk } 91 1.10.2.2 pk } 92 1.10.2.2 pk 93 1.10.2.2 pk /* this isn't fatal... */ 94 1.10.2.2 pk if (error) { 95 1.10.2.2 pk printf("kernfs: no raw root device\n"); 96 1.10.2.2 pk rrootdevvp = NULL; 97 1.10.2.2 pk } 98 1.10.2.2 pk } 99 1.10.2.2 pk 100 1.10.2.2 pk /* 101 1.10.2.2 pk * Mount the kernel parameter filesystem 102 1.10.2.2 pk */ 103 1.10.2.2 pk kernfs_mount(mp, path, data, ndp, p) 104 1.10.2.2 pk struct mount *mp; 105 1.10.2.2 pk char *path; 106 1.10.2.2 pk caddr_t data; 107 1.10.2.2 pk struct nameidata *ndp; 108 1.10.2.2 pk struct proc *p; 109 1.10.2.2 pk { 110 1.10.2.2 pk int error = 0; 111 1.10.2.2 pk u_int size; 112 1.10.2.2 pk struct kernfs_mount *fmp; 113 1.10.2.2 pk struct vnode *rvp; 114 1.10.2.2 pk 115 1.10.2.2 pk #ifdef KERNFS_DIAGNOSTIC 116 1.10.2.2 pk printf("kernfs_mount(mp = %x)\n", mp); 117 1.10.2.2 pk #endif 118 1.10.2.2 pk 119 1.10.2.2 pk /* 120 1.10.2.2 pk * Update is a no-op 121 1.10.2.2 pk */ 122 1.10.2.2 pk if (mp->mnt_flag & MNT_UPDATE) 123 1.10.2.2 pk return (ENODEV); 124 1.10.2.2 pk 125 1.10.2.2 pk error = getnewvnode(VT_KERNFS, mp, &kernfs_vnodeops, &rvp); 126 1.10.2.2 pk if (error) 127 1.10.2.2 pk return (error); 128 1.10.2.2 pk 129 1.10.2.2 pk fmp = (struct kernfs_mount *) malloc(sizeof(struct kernfs_mount), 130 1.10.2.2 pk M_MISCFSMNT, M_WAITOK); 131 1.10.2.2 pk rvp->v_type = VDIR; 132 1.10.2.2 pk rvp->v_flag |= VROOT; 133 1.10.2.2 pk VTOKERN(rvp)->kf_kt = &kernfs_targets[KERNFS_TARGET_ROOT]; 134 1.10.2.2 pk #ifdef KERNFS_DIAGNOSTIC 135 1.10.2.2 pk printf("kernfs_mount: root vp = %x\n", rvp); 136 1.10.2.2 pk #endif 137 1.10.2.2 pk fmp->kf_root = rvp; 138 1.10.2.2 pk mp->mnt_flag |= MNT_LOCAL; 139 1.10.2.2 pk mp->mnt_data = (qaddr_t) fmp; 140 1.10.2.2 pk getnewfsid(mp, MOUNT_KERNFS); 141 1.10.2.2 pk 142 1.10.2.2 pk (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 143 1.10.2.2 pk bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 144 1.10.2.2 pk bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 145 1.10.2.2 pk bcopy("kernfs", mp->mnt_stat.f_mntfromname, sizeof("kernfs")); 146 1.10.2.2 pk #ifdef KERNFS_DIAGNOSTIC 147 1.10.2.2 pk printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname); 148 1.10.2.2 pk #endif 149 1.10.2.2 pk 150 1.10.2.2 pk kernfs_rrootdevvp_init(); 151 1.10.2.2 pk 152 1.10.2.2 pk return (0); 153 1.10.2.2 pk } 154 1.10.2.2 pk 155 1.10.2.2 pk kernfs_start(mp, flags, p) 156 1.10.2.2 pk struct mount *mp; 157 1.10.2.2 pk int flags; 158 1.10.2.2 pk struct proc *p; 159 1.10.2.2 pk { 160 1.10.2.2 pk return (0); 161 1.10.2.2 pk } 162 1.10.2.2 pk 163 1.10.2.2 pk kernfs_unmount(mp, mntflags, p) 164 1.10.2.2 pk struct mount *mp; 165 1.10.2.2 pk int mntflags; 166 1.10.2.2 pk struct proc *p; 167 1.10.2.2 pk { 168 1.10.2.2 pk int error; 169 1.10.2.2 pk int flags = 0; 170 1.10.2.2 pk extern int doforce; 171 1.10.2.2 pk struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root; 172 1.10.2.2 pk 173 1.10.2.2 pk #ifdef KERNFS_DIAGNOSTIC 174 1.10.2.2 pk printf("kernfs_unmount(mp = %x)\n", mp); 175 1.10.2.2 pk #endif 176 1.10.2.2 pk 177 1.10.2.2 pk if (mntflags & MNT_FORCE) { 178 1.10.2.2 pk /* kernfs can never be rootfs so don't check for it */ 179 1.10.2.2 pk if (!doforce) 180 1.10.2.2 pk return (EINVAL); 181 1.10.2.2 pk flags |= FORCECLOSE; 182 1.10.2.2 pk } 183 1.10.2.2 pk 184 1.10.2.2 pk /* 185 1.10.2.2 pk * Clear out buffer cache. I don't think we 186 1.10.2.2 pk * ever get anything cached at this level at the 187 1.10.2.2 pk * moment, but who knows... 188 1.10.2.2 pk */ 189 1.10.2.2 pk #ifdef KERNFS_DIAGNOSTIC 190 1.10.2.2 pk printf("kernfs_unmount: calling mntflushbuf\n"); 191 1.10.2.2 pk #endif 192 1.10.2.2 pk mntflushbuf(mp, 0); 193 1.10.2.2 pk #ifdef KERNFS_DIAGNOSTIC 194 1.10.2.2 pk printf("kernfs_unmount: calling mntinvalbuf\n"); 195 1.10.2.2 pk #endif 196 1.10.2.2 pk if (mntinvalbuf(mp, 1)) 197 1.10.2.2 pk return (EBUSY); 198 1.10.2.2 pk if (rootvp->v_usecount > 1) 199 1.10.2.2 pk return (EBUSY); 200 1.10.2.2 pk #ifdef KERNFS_DIAGNOSTIC 201 1.10.2.2 pk printf("kernfs_unmount: calling vflush\n"); 202 1.10.2.2 pk #endif 203 1.10.2.2 pk if (error = vflush(mp, rootvp, flags)) 204 1.10.2.2 pk return (error); 205 1.10.2.2 pk 206 1.10.2.2 pk #ifdef KERNFS_DIAGNOSTIC 207 1.10.2.2 pk vprint("kernfs root", rootvp); 208 1.10.2.2 pk #endif 209 1.10.2.2 pk /* 210 1.10.2.2 pk * Release reference on underlying root vnode 211 1.10.2.2 pk */ 212 1.10.2.2 pk vrele(rootvp); 213 1.10.2.2 pk /* 214 1.10.2.2 pk * And blow it away for future re-use 215 1.10.2.2 pk */ 216 1.10.2.2 pk vgone(rootvp); 217 1.10.2.2 pk /* 218 1.10.2.2 pk * Finally, throw away the kernfs_mount structure 219 1.10.2.2 pk */ 220 1.10.2.2 pk free(mp->mnt_data, M_MISCFSMNT); 221 1.10.2.2 pk mp->mnt_data = 0; 222 1.10.2.2 pk return 0; 223 1.10.2.2 pk } 224 1.10.2.2 pk 225 1.10.2.2 pk kernfs_root(mp, vpp) 226 1.10.2.2 pk struct mount *mp; 227 1.10.2.2 pk struct vnode **vpp; 228 1.10.2.2 pk { 229 1.10.2.2 pk struct vnode *vp; 230 1.10.2.2 pk int error; 231 1.10.2.2 pk 232 1.10.2.2 pk #ifdef KERNFS_DIAGNOSTIC 233 1.10.2.2 pk printf("kernfs_root(mp = %x)\n", mp); 234 1.10.2.2 pk #endif 235 1.10.2.2 pk 236 1.10.2.2 pk /* 237 1.10.2.2 pk * Return locked reference to root. 238 1.10.2.2 pk */ 239 1.10.2.2 pk vp = VFSTOKERNFS(mp)->kf_root; 240 1.10.2.2 pk VREF(vp); 241 1.10.2.2 pk VOP_LOCK(vp); 242 1.10.2.2 pk *vpp = vp; 243 1.10.2.2 pk return (0); 244 1.10.2.2 pk } 245 1.10.2.2 pk 246 1.10.2.2 pk kernfs_quotactl(mp, cmd, uid, arg, p) 247 1.10.2.2 pk struct mount *mp; 248 1.10.2.2 pk int cmd; 249 1.10.2.2 pk uid_t uid; 250 1.10.2.2 pk caddr_t arg; 251 1.10.2.2 pk struct proc *p; 252 1.10.2.2 pk { 253 1.10.2.2 pk return (ENODEV); 254 1.10.2.2 pk } 255 1.10.2.2 pk 256 1.10.2.2 pk kernfs_statfs(mp, sbp, p) 257 1.10.2.2 pk struct mount *mp; 258 1.10.2.2 pk struct statfs *sbp; 259 1.10.2.2 pk struct proc *p; 260 1.10.2.2 pk { 261 1.10.2.2 pk struct filedesc *fdp; 262 1.10.2.2 pk int lim; 263 1.10.2.2 pk int i; 264 1.10.2.2 pk int last; 265 1.10.2.2 pk int freefd; 266 1.10.2.2 pk 267 1.10.2.2 pk #ifdef KERNFS_DIAGNOSTIC 268 1.10.2.2 pk printf("kernfs_statfs(mp = %x)\n", mp); 269 1.10.2.2 pk #endif 270 1.10.2.2 pk 271 1.10.2.2 pk sbp->f_type = MOUNT_KERNFS; 272 1.10.2.2 pk sbp->f_flags = 0; 273 1.10.2.2 pk sbp->f_fsize = DEV_BSIZE; 274 1.10.2.2 pk sbp->f_bsize = DEV_BSIZE; 275 1.10.2.2 pk sbp->f_blocks = 2; /* 1K to keep df happy */ 276 1.10.2.2 pk sbp->f_bfree = 0; 277 1.10.2.2 pk sbp->f_bavail = 0; 278 1.10.2.2 pk sbp->f_files = 0; /* Allow for "." */ 279 1.10.2.2 pk sbp->f_ffree = 0; /* See comments above */ 280 1.10.2.2 pk if (sbp != &mp->mnt_stat) { 281 1.10.2.2 pk bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 282 1.10.2.2 pk bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 283 1.10.2.2 pk bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 284 1.10.2.2 pk } 285 1.10.2.2 pk return (0); 286 1.10.2.2 pk } 287 1.10.2.2 pk 288 1.10.2.2 pk kernfs_sync(mp, waitfor) 289 1.10.2.2 pk struct mount *mp; 290 1.10.2.2 pk int waitfor; 291 1.10.2.2 pk { 292 1.10.2.2 pk return (0); 293 1.10.2.2 pk } 294 1.10.2.2 pk 295 1.10.2.2 pk kernfs_fhtovp(mp, fhp, vpp) 296 1.10.2.2 pk struct mount *mp; 297 1.10.2.2 pk struct fid *fhp; 298 1.10.2.2 pk struct vnode **vpp; 299 1.10.2.2 pk { 300 1.10.2.2 pk return (ENODEV); 301 1.10.2.2 pk } 302 1.10.2.2 pk 303 1.10.2.2 pk kernfs_vptofh(vp, fhp) 304 1.10.2.2 pk struct vnode *vp; 305 1.10.2.2 pk struct fid *fhp; 306 1.10.2.2 pk { 307 1.10.2.2 pk return (ENODEV); 308 1.10.2.2 pk } 309 1.10.2.2 pk 310 1.10.2.2 pk struct vfsops kernfs_vfsops = { 311 1.10.2.2 pk kernfs_mount, 312 1.10.2.2 pk kernfs_start, 313 1.10.2.2 pk kernfs_unmount, 314 1.10.2.2 pk kernfs_root, 315 1.10.2.2 pk kernfs_quotactl, 316 1.10.2.2 pk kernfs_statfs, 317 1.10.2.2 pk kernfs_sync, 318 1.10.2.2 pk kernfs_fhtovp, 319 1.10.2.2 pk kernfs_vptofh, 320 1.10.2.2 pk kernfs_init, 321 1.10.2.2 pk }; 322
Indexes created Mon Sep 29 21:09:56 GMT 2025