layer_vfsops.c revision 1.7
1 /* $NetBSD: layer_vfsops.c,v 1.7 2003/06/28 14:22:02 darrenr 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 1.7 2003/06/28 14:22:02 darrenr 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, l) 100 struct mount *mp; 101 int flags; 102 struct lwp *l; 103 { 104 105 return (0); 106 /* return VFS_START(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, flags, l); */ 107 } 108 109 int 110 layerfs_root(mp, vpp, l) 111 struct mount *mp; 112 struct vnode **vpp; 113 struct lwp *l; 114 { 115 struct vnode *vp; 116 117 #ifdef LAYERFS_DIAGNOSTIC 118 printf("layerfs_root(mp = %p, vp = %p->%p)\n", mp, 119 MOUNTTOLAYERMOUNT(mp)->layerm_rootvp, 120 LAYERVPTOLOWERVP(MOUNTTOLAYERMOUNT(mp)->layerm_rootvp)); 121 #endif 122 123 /* 124 * Return locked reference to root. 125 */ 126 vp = MOUNTTOLAYERMOUNT(mp)->layerm_rootvp; 127 if (vp == NULL) { 128 *vpp = NULL; 129 return (EINVAL); 130 } 131 VREF(vp); 132 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 133 *vpp = vp; 134 return 0; 135 } 136 137 int 138 layerfs_quotactl(mp, cmd, uid, arg, l) 139 struct mount *mp; 140 int cmd; 141 uid_t uid; 142 caddr_t arg; 143 struct lwp *l; 144 { 145 146 return VFS_QUOTACTL(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, 147 cmd, uid, arg, l); 148 } 149 150 int 151 layerfs_statfs(mp, sbp, l) 152 struct mount *mp; 153 struct statfs *sbp; 154 struct lwp *l; 155 { 156 int error; 157 struct statfs mstat; 158 159 #ifdef LAYERFS_DIAGNOSTIC 160 printf("layerfs_statfs(mp = %p, vp = %p->%p)\n", mp, 161 MOUNTTOLAYERMOUNT(mp)->layerm_rootvp, 162 LAYERVPTOLOWERVP(MOUNTTOLAYERMOUNT(mp)->layerm_rootvp)); 163 #endif 164 165 memset(&mstat, 0, sizeof(mstat)); 166 167 error = VFS_STATFS(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, &mstat, l); 168 if (error) 169 return (error); 170 171 /* now copy across the "interesting" information and fake the rest */ 172 sbp->f_type = mstat.f_type; 173 sbp->f_flags = mstat.f_flags; 174 sbp->f_bsize = mstat.f_bsize; 175 sbp->f_iosize = mstat.f_iosize; 176 sbp->f_blocks = mstat.f_blocks; 177 sbp->f_bfree = mstat.f_bfree; 178 sbp->f_bavail = mstat.f_bavail; 179 sbp->f_files = mstat.f_files; 180 sbp->f_ffree = mstat.f_ffree; 181 copy_statfs_info(sbp, mp); 182 return (0); 183 } 184 185 int 186 layerfs_sync(mp, waitfor, cred, l) 187 struct mount *mp; 188 int waitfor; 189 struct ucred *cred; 190 struct lwp *l; 191 { 192 193 /* 194 * XXX - Assumes no data cached at layer. 195 */ 196 return (0); 197 } 198 199 int 200 layerfs_vget(mp, ino, vpp, l) 201 struct mount *mp; 202 ino_t ino; 203 struct vnode **vpp; 204 struct lwp *l; 205 { 206 int error; 207 struct vnode *vp; 208 209 if ((error = VFS_VGET(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, 210 ino, &vp, l))) { 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, l) 225 struct mount *mp; 226 struct fid *fidp; 227 struct vnode **vpp; 228 struct lwp *l; 229 { 230 int error; 231 struct vnode *vp; 232 233 if ((error = VFS_FHTOVP(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, 234 fidp, &vp, l))) 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, l) 278 int *name; 279 u_int namelen; 280 void *oldp; 281 size_t *oldlenp; 282 void *newp; 283 size_t newlen; 284 struct lwp *l; 285 { 286 return (EOPNOTSUPP); 287 } 288
Indexes created Tue Sep 23 20:09:58 GMT 2025