1 /* $NetBSD: layer_vfsops.c,v 1.5 2001/11/15 09:48:21 lukem 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 Simulation 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/cdefs.h> 80 __KERNEL_RCSID(0, "$NetBSD: layer_vfsops.c,v 1.5 2001/11/15 09:48:21 lukem Exp $"); 81 82 #include <sys/param.h> 83 #include <sys/systm.h> 84 #include <sys/time.h> 85 #include <sys/proc.h> 86 #include <sys/vnode.h> 87 #include <sys/mount.h> 88 #include <sys/namei.h> 89 #include <sys/malloc.h> 90 #include <miscfs/genfs/layer.h> 91 #include <miscfs/genfs/layer_extern.h> 92 93 /* 94 * VFS start. Nothing needed here - the start routine 95 * on the underlying filesystem will have been called 96 * when that filesystem was mounted. 97 */ 98 int 99 layerfs_start(mp, flags, p) 100 struct mount *mp; 101 int flags; 102 struct proc *p; 103 { 104 105 return (0); 106 /* return VFS_START(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, flags, p); */ 107 } 108 109 int 110 layerfs_root(mp, vpp) 111 struct mount *mp; 112 struct vnode **vpp; 113 { 114 struct vnode *vp; 115 116 #ifdef LAYERFS_DIAGNOSTIC 117 printf("layerfs_root(mp = %p, vp = %p->%p)\n", mp, 118 MOUNTTOLAYERMOUNT(mp)->layerm_rootvp, 119 LAYERVPTOLOWERVP(MOUNTTOLAYERMOUNT(mp)->layerm_rootvp)); 120 #endif 121 122 /* 123 * Return locked reference to root. 124 */ 125 vp = MOUNTTOLAYERMOUNT(mp)->layerm_rootvp; 126 if (vp == NULL) { 127 *vpp = NULL; 128 return (EINVAL); 129 } 130 VREF(vp); 131 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 132 *vpp = vp; 133 return 0; 134 } 135 136 int 137 layerfs_quotactl(mp, cmd, uid, arg, p) 138 struct mount *mp; 139 int cmd; 140 uid_t uid; 141 caddr_t arg; 142 struct proc *p; 143 { 144 145 return VFS_QUOTACTL(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, 146 cmd, uid, arg, p); 147 } 148 149 int 150 layerfs_statfs(mp, sbp, p) 151 struct mount *mp; 152 struct statfs *sbp; 153 struct proc *p; 154 { 155 int error; 156 struct statfs mstat; 157 158 #ifdef LAYERFS_DIAGNOSTIC 159 printf("layerfs_statfs(mp = %p, vp = %p->%p)\n", mp, 160 MOUNTTOLAYERMOUNT(mp)->layerm_rootvp, 161 LAYERVPTOLOWERVP(MOUNTTOLAYERMOUNT(mp)->layerm_rootvp)); 162 #endif 163 164 memset(&mstat, 0, sizeof(mstat)); 165 166 error = VFS_STATFS(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, &mstat, p); 167 if (error) 168 return (error); 169 170 /* now copy across the "interesting" information and fake the rest */ 171 sbp->f_type = mstat.f_type; 172 sbp->f_flags = mstat.f_flags; 173 sbp->f_bsize = mstat.f_bsize; 174 sbp->f_iosize = mstat.f_iosize; 175 sbp->f_blocks = mstat.f_blocks; 176 sbp->f_bfree = mstat.f_bfree; 177 sbp->f_bavail = mstat.f_bavail; 178 sbp->f_files = mstat.f_files; 179 sbp->f_ffree = mstat.f_ffree; 180 if (sbp != &mp->mnt_stat) { 181 memcpy(&sbp->f_fsid, &mp->mnt_stat.f_fsid, sizeof(sbp->f_fsid)); 182 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 183 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 184 } 185 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 186 return (0); 187 } 188 189 int 190 layerfs_sync(mp, waitfor, cred, p) 191 struct mount *mp; 192 int waitfor; 193 struct ucred *cred; 194 struct proc *p; 195 { 196 197 /* 198 * XXX - Assumes no data cached at layer. 199 */ 200 return (0); 201 } 202 203 int 204 layerfs_vget(mp, ino, vpp) 205 struct mount *mp; 206 ino_t ino; 207 struct vnode **vpp; 208 { 209 int error; 210 struct vnode *vp; 211 212 if ((error = VFS_VGET(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, ino, &vp))) { 213 *vpp = NULL; 214 return (error); 215 } 216 if ((error = layer_node_create(mp, vp, vpp))) { 217 vput(vp); 218 *vpp = NULL; 219 return (error); 220 } 221 222 return (0); 223 } 224 225 int 226 layerfs_fhtovp(mp, fidp, vpp) 227 struct mount *mp; 228 struct fid *fidp; 229 struct vnode **vpp; 230 { 231 int error; 232 struct vnode *vp; 233 234 if ((error = VFS_FHTOVP(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, fidp, &vp))) 235 return (error); 236 237 if ((error = layer_node_create(mp, vp, vpp))) { 238 vput(vp); 239 *vpp = NULL; 240 return (error); 241 } 242 243 return (0); 244 } 245 246 int 247 layerfs_checkexp(mp, nam, exflagsp, credanonp) 248 struct mount *mp; 249 struct mbuf *nam; 250 int *exflagsp; 251 struct ucred**credanonp; 252 { 253 struct netcred *np; 254 struct layer_mount *lmp = MOUNTTOLAYERMOUNT(mp); 255 256 /* 257 * get the export permission structure for this <mp, client> tuple. 258 */ 259 if ((np = vfs_export_lookup(mp, &lmp->layerm_export, nam)) == NULL) 260 return (EACCES); 261 262 *exflagsp = np->netc_exflags; 263 *credanonp = &np->netc_anon; 264 return (0); 265 } 266 267 int 268 layerfs_vptofh(vp, fhp) 269 struct vnode *vp; 270 struct fid *fhp; 271 { 272 273 return (VFS_VPTOFH(LAYERVPTOLOWERVP(vp), fhp)); 274 } 275 276 int 277 layerfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 278 int *name; 279 u_int namelen; 280 void *oldp; 281 size_t *oldlenp; 282 void *newp; 283 size_t newlen; 284 struct proc *p; 285 { 286 return (EOPNOTSUPP); 287 } 288