1 /* $NetBSD: layer_vfsops.c,v 1.2 2000/03/13 23:52:40 soren Exp $ */ 2 3 /* 4 * Copyright (c) 1999 National Aeronautics & Space Administration 5 * All rights reserved. 6 * 7 * This software was written by William Studenmund of the 8 * Numerical Aerospace Similation Facility, NASA Ames Research Center. 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. Neither the name of the National Aeronautics & Space Administration 19 * nor the names of its contributors may be used to endorse or promote 20 * products derived from this software without specific prior written 21 * permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE NATIONAL AERONAUTICS & SPACE ADMINISTRATION 24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE ADMINISTRATION OR CONTRIB- 27 * UTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 28 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGE. 34 */ 35 /* 36 * Copyright (c) 1992, 1993, 1995 37 * The Regents of the University of California. All rights reserved. 38 * 39 * This code is derived from software donated to Berkeley by 40 * Jan-Simon Pendry. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by the University of 53 * California, Berkeley and its contributors. 54 * 4. Neither the name of the University nor the names of its contributors 55 * may be used to endorse or promote products derived from this software 56 * without specific prior written permission. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 59 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 60 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 61 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 62 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 63 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 64 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 66 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 67 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 68 * SUCH DAMAGE. 69 * 70 * from: Id: lofs_vfsops.c,v 1.9 1992/05/30 10:26:24 jsp Exp 71 * from: @(#)lofs_vfsops.c 1.2 (Berkeley) 6/18/92 72 * @(#)null_vfsops.c 8.7 (Berkeley) 5/14/95 73 */ 74 75 /* 76 * generic layer vfs ops. 77 */ 78 79 #include <sys/param.h> 80 #include <sys/systm.h> 81 #include <sys/time.h> 82 #include <sys/proc.h> 83 #include <sys/types.h> 84 #include <sys/vnode.h> 85 #include <sys/mount.h> 86 #include <sys/namei.h> 87 #include <sys/malloc.h> 88 #include <miscfs/genfs/layer.h> 89 #include <miscfs/genfs/layer_extern.h> 90 91 /* 92 * VFS start. Nothing needed here - the start routine 93 * on the underlying filesystem will have been called 94 * when that filesystem was mounted. 95 */ 96 int 97 layerfs_start(mp, flags, p) 98 struct mount *mp; 99 int flags; 100 struct proc *p; 101 { 102 103 return (0); 104 /* return VFS_START(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, flags, p); */ 105 } 106 107 int 108 layerfs_root(mp, vpp) 109 struct mount *mp; 110 struct vnode **vpp; 111 { 112 struct vnode *vp; 113 114 #ifdef LAYERFS_DIAGNOSTIC 115 printf("layerfs_root(mp = %p, vp = %p->%p)\n", mp, 116 MOUNTTOLAYERMOUNT(mp)->layerm_rootvp, 117 LAYERVPTOLOWERVP(MOUNTTOLAYERMOUNT(mp)->layerm_rootvp)); 118 #endif 119 120 /* 121 * Return locked reference to root. 122 */ 123 vp = MOUNTTOLAYERMOUNT(mp)->layerm_rootvp; 124 if (vp == NULL) { 125 *vpp = NULL; 126 return (EINVAL); 127 } 128 VREF(vp); 129 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 130 *vpp = vp; 131 return 0; 132 } 133 134 int 135 layerfs_quotactl(mp, cmd, uid, arg, p) 136 struct mount *mp; 137 int cmd; 138 uid_t uid; 139 caddr_t arg; 140 struct proc *p; 141 { 142 143 return VFS_QUOTACTL(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, 144 cmd, uid, arg, p); 145 } 146 147 int 148 layerfs_statfs(mp, sbp, p) 149 struct mount *mp; 150 struct statfs *sbp; 151 struct proc *p; 152 { 153 int error; 154 struct statfs mstat; 155 156 #ifdef LAYERFS_DIAGNOSTIC 157 printf("layerfs_statfs(mp = %p, vp = %p->%p)\n", mp, 158 MOUNTTOLAYERMOUNT(mp)->layerm_rootvp, 159 LAYERVPTOLOWERVP(MOUNTTOLAYERMOUNT(mp)->layerm_rootvp)); 160 #endif 161 162 memset(&mstat, 0, sizeof(mstat)); 163 164 error = VFS_STATFS(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, &mstat, p); 165 if (error) 166 return (error); 167 168 /* now copy across the "interesting" information and fake the rest */ 169 sbp->f_type = mstat.f_type; 170 sbp->f_flags = mstat.f_flags; 171 sbp->f_bsize = mstat.f_bsize; 172 sbp->f_iosize = mstat.f_iosize; 173 sbp->f_blocks = mstat.f_blocks; 174 sbp->f_bfree = mstat.f_bfree; 175 sbp->f_bavail = mstat.f_bavail; 176 sbp->f_files = mstat.f_files; 177 sbp->f_ffree = mstat.f_ffree; 178 if (sbp != &mp->mnt_stat) { 179 memcpy(&sbp->f_fsid, &mp->mnt_stat.f_fsid, sizeof(sbp->f_fsid)); 180 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 181 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 182 } 183 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 184 return (0); 185 } 186 187 int 188 layerfs_sync(mp, waitfor, cred, p) 189 struct mount *mp; 190 int waitfor; 191 struct ucred *cred; 192 struct proc *p; 193 { 194 195 /* 196 * XXX - Assumes no data cached at layer. 197 */ 198 return (0); 199 } 200 201 int 202 layerfs_vget(mp, ino, vpp) 203 struct mount *mp; 204 ino_t ino; 205 struct vnode **vpp; 206 { 207 int error; 208 struct vnode *vp; 209 210 if ((error = VFS_VGET(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, ino, &vp))) { 211 *vpp = NULL; 212 return (error); 213 } 214 if ((error = layer_node_create(mp, vp, vpp))) { 215 vput(vp); 216 *vpp = NULL; 217 return (error); 218 } 219 220 return (0); 221 } 222 223 int 224 layerfs_fhtovp(mp, fidp, vpp) 225 struct mount *mp; 226 struct fid *fidp; 227 struct vnode **vpp; 228 { 229 int error; 230 struct vnode *vp; 231 232 if ((error = VFS_FHTOVP(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, fidp, &vp))) 233 return (error); 234 235 if ((error = layer_node_create(mp, vp, vpp))) { 236 vput(vp); 237 *vpp = NULL; 238 return (error); 239 } 240 241 return (0); 242 } 243 244 int 245 layerfs_checkexp(mp, nam, exflagsp, credanonp) 246 struct mount *mp; 247 struct mbuf *nam; 248 int *exflagsp; 249 struct ucred**credanonp; 250 { 251 struct netcred *np; 252 struct layer_mount *lmp = MOUNTTOLAYERMOUNT(mp); 253 254 /* 255 * get the export permission structure for this <mp, client> tuple. 256 */ 257 if ((np = vfs_export_lookup(mp, &lmp->layerm_export, nam)) == NULL) 258 return (EACCES); 259 260 *exflagsp = np->netc_exflags; 261 *credanonp = &np->netc_anon; 262 return (0); 263 } 264 265 int 266 layerfs_vptofh(vp, fhp) 267 struct vnode *vp; 268 struct fid *fhp; 269 { 270 271 return (VFS_VPTOFH(LAYERVPTOLOWERVP(vp), fhp)); 272 } 273 274 int 275 layerfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 276 int *name; 277 u_int namelen; 278 void *oldp; 279 size_t *oldlenp; 280 void *newp; 281 size_t newlen; 282 struct proc *p; 283 { 284 return (EOPNOTSUPP); 285 } 286