kernfs_vfsops.c revision 1.2
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 1.2 1993/03/25 06:00:23 cgd Exp $ 37 */ 38 39 /* 40 * Kernel params Filesystem 41 */ 42 43 #include "param.h" 44 #include "systm.h" 45 #include "time.h" 46 #include "types.h" 47 #include "proc.h" 48 #include "vnode.h" 49 #include "mount.h" 50 #include "namei.h" 51 #include "malloc.h" 52 #include "miscfs/kernfs/kernfs.h" 53 54 kernfs_init() 55 { 56 #ifdef KERNFS_DIAGNOSTIC 57 printf("kernfs_init\n"); /* printed during system boot */ 58 #endif 59 } 60 61 /* 62 * Mount the kernel parameter filesystem 63 */ 64 kernfs_mount(mp, path, data, ndp, p) 65 struct mount *mp; 66 char *path; 67 caddr_t data; 68 struct nameidata *ndp; 69 struct proc *p; 70 { 71 int error = 0; 72 u_int size; 73 struct kernfs_mount *fmp; 74 struct vnode *rvp; 75 76 #ifdef KERNFS_DIAGNOSTIC 77 printf("kernfs_mount(mp = %x)\n", mp); 78 #endif 79 80 /* 81 * Update is a no-op 82 */ 83 if (mp->mnt_flag & MNT_UPDATE) 84 return (EOPNOTSUPP); 85 86 error = getnewvnode(VT_UFS, mp, &kernfs_vnodeops, &rvp); /* XXX */ 87 if (error) 88 return (error); 89 90 fmp = (struct kernfs_mount *) malloc(sizeof(struct kernfs_mount), 91 M_UFSMNT, M_WAITOK); /* XXX */ 92 rvp->v_type = VDIR; 93 rvp->v_flag |= VROOT; 94 #ifdef KERNFS_DIAGNOSTIC 95 printf("kernfs_mount: root vp = %x\n", rvp); 96 #endif 97 fmp->kf_root = rvp; 98 mp->mnt_flag |= MNT_LOCAL; 99 mp->mnt_data = (qaddr_t) fmp; 100 getnewfsid(mp, MOUNT_KERNFS); 101 102 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 103 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 104 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 105 bcopy("kernfs", mp->mnt_stat.f_mntfromname, sizeof("kernfs")); 106 #ifdef KERNFS_DIAGNOSTIC 107 printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname); 108 #endif 109 return (0); 110 } 111 112 kernfs_start(mp, flags, p) 113 struct mount *mp; 114 int flags; 115 struct proc *p; 116 { 117 return (0); 118 } 119 120 kernfs_unmount(mp, mntflags, p) 121 struct mount *mp; 122 int mntflags; 123 struct proc *p; 124 { 125 int error; 126 int flags = 0; 127 extern int doforce; 128 struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root; 129 130 #ifdef KERNFS_DIAGNOSTIC 131 printf("kernfs_unmount(mp = %x)\n", mp); 132 #endif 133 134 if (mntflags & MNT_FORCE) { 135 /* kernfs can never be rootfs so don't check for it */ 136 if (!doforce) 137 return (EINVAL); 138 flags |= FORCECLOSE; 139 } 140 141 /* 142 * Clear out buffer cache. I don't think we 143 * ever get anything cached at this level at the 144 * moment, but who knows... 145 */ 146 #ifdef KERNFS_DIAGNOSTIC 147 printf("kernfs_unmount: calling mntflushbuf\n"); 148 #endif 149 mntflushbuf(mp, 0); 150 #ifdef KERNFS_DIAGNOSTIC 151 printf("kernfs_unmount: calling mntinvalbuf\n"); 152 #endif 153 if (mntinvalbuf(mp, 1)) 154 return (EBUSY); 155 if (rootvp->v_usecount > 1) 156 return (EBUSY); 157 #ifdef KERNFS_DIAGNOSTIC 158 printf("kernfs_unmount: calling vflush\n"); 159 #endif 160 if (error = vflush(mp, rootvp, flags)) 161 return (error); 162 163 #ifdef KERNFS_DIAGNOSTIC 164 vprint("kernfs root", rootvp); 165 #endif 166 /* 167 * Release reference on underlying root vnode 168 */ 169 vrele(rootvp); 170 /* 171 * And blow it away for future re-use 172 */ 173 vgone(rootvp); 174 /* 175 * Finally, throw away the kernfs_mount structure 176 */ 177 free(mp->mnt_data, M_UFSMNT); /* XXX */ 178 mp->mnt_data = 0; 179 return 0; 180 } 181 182 kernfs_root(mp, vpp) 183 struct mount *mp; 184 struct vnode **vpp; 185 { 186 struct vnode *vp; 187 int error; 188 189 #ifdef KERNFS_DIAGNOSTIC 190 printf("kernfs_root(mp = %x)\n", mp); 191 #endif 192 193 /* 194 * Return locked reference to root. 195 */ 196 vp = VFSTOKERNFS(mp)->kf_root; 197 VREF(vp); 198 VOP_LOCK(vp); 199 *vpp = vp; 200 return (0); 201 } 202 203 kernfs_quotactl(mp, cmd, uid, arg, p) 204 struct mount *mp; 205 int cmd; 206 uid_t uid; 207 caddr_t arg; 208 struct proc *p; 209 { 210 return (EOPNOTSUPP); 211 } 212 213 kernfs_statfs(mp, sbp, p) 214 struct mount *mp; 215 struct statfs *sbp; 216 struct proc *p; 217 { 218 struct filedesc *fdp; 219 int lim; 220 int i; 221 int last; 222 int freefd; 223 224 #ifdef KERNFS_DIAGNOSTIC 225 printf("kernfs_statfs(mp = %x)\n", mp); 226 #endif 227 228 sbp->f_type = MOUNT_KERNFS; 229 sbp->f_flags = 0; 230 sbp->f_fsize = DEV_BSIZE; 231 sbp->f_bsize = DEV_BSIZE; 232 sbp->f_blocks = 2; /* 1K to keep df happy */ 233 sbp->f_bfree = 0; 234 sbp->f_bavail = 0; 235 sbp->f_files = 0; /* Allow for "." */ 236 sbp->f_ffree = 0; /* See comments above */ 237 if (sbp != &mp->mnt_stat) { 238 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 239 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 240 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 241 } 242 return (0); 243 } 244 245 kernfs_sync(mp, waitfor) 246 struct mount *mp; 247 int waitfor; 248 { 249 return (0); 250 } 251 252 kernfs_fhtovp(mp, fhp, vpp) 253 struct mount *mp; 254 struct fid *fhp; 255 struct vnode **vpp; 256 { 257 return (EOPNOTSUPP); 258 } 259 260 kernfs_vptofh(vp, fhp) 261 struct vnode *vp; 262 struct fid *fhp; 263 { 264 return (EOPNOTSUPP); 265 } 266 267 struct vfsops kernfs_vfsops = { 268 kernfs_mount, 269 kernfs_start, 270 kernfs_unmount, 271 kernfs_root, 272 kernfs_quotactl, 273 kernfs_statfs, 274 kernfs_sync, 275 kernfs_fhtovp, 276 kernfs_vptofh, 277 kernfs_init, 278 }; 279
Indexes created Wed Sep 24 05:09:52 GMT 2025