kernfs_vfsops.c revision 1.9
1 /* 2 * Copyright (c) 1990, 1992 Jan-Simon Pendry 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Jan-Simon Pendry. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * $Id: kernfs_vfsops.c,v 1.9 1993/12/18 03:55:47 mycroft Exp $ 37 */ 38 39 /* 40 * Kernel params Filesystem 41 */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/time.h> 46 #include <sys/types.h> 47 #include <sys/proc.h> 48 #include <sys/vnode.h> 49 #include <sys/mount.h> 50 #include <sys/namei.h> 51 #include <sys/malloc.h> 52 #include <sys/conf.h> 53 54 #include <miscfs/kernfs/kernfs.h> 55 56 /* bring in the spec vnodeops for cdevvp */ 57 extern struct vnodeops spec_vnodeops; 58 59 struct vnode *rrootdevvp; 60 61 kernfs_init() 62 { 63 int error, bmaj, cmaj; 64 65 #ifdef KERNFS_DIAGNOSTIC 66 printf("kernfs_init\n"); /* printed during system boot */ 67 #endif 68 69 bmaj = major(rootdev); 70 71 /* hunt for the raw root device by looking in cdevsw for a matching 72 * open routine... 73 */ 74 for (cmaj = 0; cmaj < nchrdev; cmaj++) { 75 if (cdevsw[cmaj].d_open == bdevsw[bmaj].d_open) { 76 dev_t cdev = makedev(cmaj, minor(rootdev)); 77 error = cdevvp(cdev, &rrootdevvp); 78 if (error == 0) 79 break; 80 } 81 } 82 83 /* this isn't fatal... */ 84 if (error) { 85 printf("kernfs: no raw root device\n"); 86 rrootdevvp = 0; 87 } 88 } 89 90 /* 91 * Mount the kernel parameter filesystem 92 */ 93 kernfs_mount(mp, path, data, ndp, p) 94 struct mount *mp; 95 char *path; 96 caddr_t data; 97 struct nameidata *ndp; 98 struct proc *p; 99 { 100 int error = 0; 101 u_int size; 102 struct kernfs_mount *fmp; 103 struct vnode *rvp; 104 105 #ifdef KERNFS_DIAGNOSTIC 106 printf("kernfs_mount(mp = %x)\n", mp); 107 #endif 108 109 /* 110 * Update is a no-op 111 */ 112 if (mp->mnt_flag & MNT_UPDATE) 113 return (EOPNOTSUPP); 114 115 error = getnewvnode(VT_KERNFS, mp, &kernfs_vnodeops, &rvp); 116 if (error) 117 return (error); 118 119 fmp = (struct kernfs_mount *) malloc(sizeof(struct kernfs_mount), 120 M_MISCFSMNT, M_WAITOK); 121 rvp->v_type = VDIR; 122 rvp->v_flag |= VROOT; 123 VTOKERN(rvp)->kf_kt = &kernfs_targets[KERNFS_TARGET_ROOT]; 124 #ifdef KERNFS_DIAGNOSTIC 125 printf("kernfs_mount: root vp = %x\n", rvp); 126 #endif 127 fmp->kf_root = rvp; 128 mp->mnt_flag |= MNT_LOCAL; 129 mp->mnt_data = (qaddr_t) fmp; 130 getnewfsid(mp, MOUNT_KERNFS); 131 132 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 133 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 134 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 135 bcopy("kernfs", mp->mnt_stat.f_mntfromname, sizeof("kernfs")); 136 #ifdef KERNFS_DIAGNOSTIC 137 printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname); 138 #endif 139 return (0); 140 } 141 142 kernfs_start(mp, flags, p) 143 struct mount *mp; 144 int flags; 145 struct proc *p; 146 { 147 return (0); 148 } 149 150 kernfs_unmount(mp, mntflags, p) 151 struct mount *mp; 152 int mntflags; 153 struct proc *p; 154 { 155 int error; 156 int flags = 0; 157 extern int doforce; 158 struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root; 159 160 #ifdef KERNFS_DIAGNOSTIC 161 printf("kernfs_unmount(mp = %x)\n", mp); 162 #endif 163 164 if (mntflags & MNT_FORCE) { 165 /* kernfs can never be rootfs so don't check for it */ 166 if (!doforce) 167 return (EINVAL); 168 flags |= FORCECLOSE; 169 } 170 171 /* 172 * Clear out buffer cache. I don't think we 173 * ever get anything cached at this level at the 174 * moment, but who knows... 175 */ 176 #ifdef KERNFS_DIAGNOSTIC 177 printf("kernfs_unmount: calling mntflushbuf\n"); 178 #endif 179 mntflushbuf(mp, 0); 180 #ifdef KERNFS_DIAGNOSTIC 181 printf("kernfs_unmount: calling mntinvalbuf\n"); 182 #endif 183 if (mntinvalbuf(mp, 1)) 184 return (EBUSY); 185 if (rootvp->v_usecount > 1) 186 return (EBUSY); 187 #ifdef KERNFS_DIAGNOSTIC 188 printf("kernfs_unmount: calling vflush\n"); 189 #endif 190 if (error = vflush(mp, rootvp, flags)) 191 return (error); 192 193 #ifdef KERNFS_DIAGNOSTIC 194 vprint("kernfs root", rootvp); 195 #endif 196 /* 197 * Release reference on underlying root vnode 198 */ 199 vrele(rootvp); 200 /* 201 * And blow it away for future re-use 202 */ 203 vgone(rootvp); 204 /* 205 * Finally, throw away the kernfs_mount structure 206 */ 207 free(mp->mnt_data, M_MISCFSMNT); 208 mp->mnt_data = 0; 209 return 0; 210 } 211 212 kernfs_root(mp, vpp) 213 struct mount *mp; 214 struct vnode **vpp; 215 { 216 struct vnode *vp; 217 int error; 218 219 #ifdef KERNFS_DIAGNOSTIC 220 printf("kernfs_root(mp = %x)\n", mp); 221 #endif 222 223 /* 224 * Return locked reference to root. 225 */ 226 vp = VFSTOKERNFS(mp)->kf_root; 227 VREF(vp); 228 VOP_LOCK(vp); 229 *vpp = vp; 230 return (0); 231 } 232 233 kernfs_quotactl(mp, cmd, uid, arg, p) 234 struct mount *mp; 235 int cmd; 236 uid_t uid; 237 caddr_t arg; 238 struct proc *p; 239 { 240 return (EOPNOTSUPP); 241 } 242 243 kernfs_statfs(mp, sbp, p) 244 struct mount *mp; 245 struct statfs *sbp; 246 struct proc *p; 247 { 248 struct filedesc *fdp; 249 int lim; 250 int i; 251 int last; 252 int freefd; 253 254 #ifdef KERNFS_DIAGNOSTIC 255 printf("kernfs_statfs(mp = %x)\n", mp); 256 #endif 257 258 sbp->f_type = MOUNT_KERNFS; 259 sbp->f_flags = 0; 260 sbp->f_fsize = DEV_BSIZE; 261 sbp->f_bsize = DEV_BSIZE; 262 sbp->f_blocks = 2; /* 1K to keep df happy */ 263 sbp->f_bfree = 0; 264 sbp->f_bavail = 0; 265 sbp->f_files = 0; /* Allow for "." */ 266 sbp->f_ffree = 0; /* See comments above */ 267 if (sbp != &mp->mnt_stat) { 268 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 269 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 270 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 271 } 272 return (0); 273 } 274 275 kernfs_sync(mp, waitfor) 276 struct mount *mp; 277 int waitfor; 278 { 279 return (0); 280 } 281 282 kernfs_fhtovp(mp, fhp, vpp) 283 struct mount *mp; 284 struct fid *fhp; 285 struct vnode **vpp; 286 { 287 return (EOPNOTSUPP); 288 } 289 290 kernfs_vptofh(vp, fhp) 291 struct vnode *vp; 292 struct fid *fhp; 293 { 294 return (EOPNOTSUPP); 295 } 296 297 struct vfsops kernfs_vfsops = { 298 kernfs_mount, 299 kernfs_start, 300 kernfs_unmount, 301 kernfs_root, 302 kernfs_quotactl, 303 kernfs_statfs, 304 kernfs_sync, 305 kernfs_fhtovp, 306 kernfs_vptofh, 307 kernfs_init, 308 }; 309
Indexes created Wed Sep 24 14:09:57 GMT 2025