layer_vfsops.c revision 1.14
1 /* $NetBSD: layer_vfsops.c,v 1.14 2004/04/21 01:05:41 christos 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. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * from: Id: lofs_vfsops.c,v 1.9 1992/05/30 10:26:24 jsp Exp 67 * from: @(#)lofs_vfsops.c 1.2 (Berkeley) 6/18/92 68 * @(#)null_vfsops.c 8.7 (Berkeley) 5/14/95 69 */ 70 71 /* 72 * generic layer vfs ops. 73 */ 74 75 #include <sys/cdefs.h> 76 __KERNEL_RCSID(0, "$NetBSD: layer_vfsops.c,v 1.14 2004/04/21 01:05:41 christos Exp $"); 77 78 #include <sys/param.h> 79 #include <sys/sysctl.h> 80 #include <sys/systm.h> 81 #include <sys/time.h> 82 #include <sys/proc.h> 83 #include <sys/vnode.h> 84 #include <sys/mount.h> 85 #include <sys/namei.h> 86 #include <sys/malloc.h> 87 #include <miscfs/genfs/layer.h> 88 #include <miscfs/genfs/layer_extern.h> 89 90 /* 91 * VFS start. Nothing needed here - the start routine 92 * on the underlying filesystem will have been called 93 * when that filesystem was mounted. 94 */ 95 int 96 layerfs_start(mp, flags, p) 97 struct mount *mp; 98 int flags; 99 struct proc *p; 100 { 101 102 return (0); 103 /* return VFS_START(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, flags, p); */ 104 } 105 106 int 107 layerfs_root(mp, vpp) 108 struct mount *mp; 109 struct vnode **vpp; 110 { 111 struct vnode *vp; 112 113 #ifdef LAYERFS_DIAGNOSTIC 114 printf("layerfs_root(mp = %p, vp = %p->%p)\n", mp, 115 MOUNTTOLAYERMOUNT(mp)->layerm_rootvp, 116 LAYERVPTOLOWERVP(MOUNTTOLAYERMOUNT(mp)->layerm_rootvp)); 117 #endif 118 119 /* 120 * Return locked reference to root. 121 */ 122 vp = MOUNTTOLAYERMOUNT(mp)->layerm_rootvp; 123 if (vp == NULL) { 124 *vpp = NULL; 125 return (EINVAL); 126 } 127 VREF(vp); 128 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 129 *vpp = vp; 130 return 0; 131 } 132 133 int 134 layerfs_quotactl(mp, cmd, uid, arg, p) 135 struct mount *mp; 136 int cmd; 137 uid_t uid; 138 caddr_t arg; 139 struct proc *p; 140 { 141 142 return VFS_QUOTACTL(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, 143 cmd, uid, arg, p); 144 } 145 146 int 147 layerfs_statvfs(mp, sbp, p) 148 struct mount *mp; 149 struct statvfs *sbp; 150 struct proc *p; 151 { 152 int error; 153 struct statvfs mstat; 154 155 #ifdef LAYERFS_DIAGNOSTIC 156 printf("layerfs_statvfs(mp = %p, vp = %p->%p)\n", mp, 157 MOUNTTOLAYERMOUNT(mp)->layerm_rootvp, 158 LAYERVPTOLOWERVP(MOUNTTOLAYERMOUNT(mp)->layerm_rootvp)); 159 #endif 160 161 memset(&mstat, 0, sizeof(mstat)); 162 163 error = VFS_STATVFS(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, &mstat, p); 164 if (error) 165 return (error); 166 167 /* now copy across the "interesting" information and fake the rest */ 168 sbp->f_flag = mstat.f_flag; 169 sbp->f_bsize = mstat.f_bsize; 170 sbp->f_frsize = mstat.f_frsize; 171 sbp->f_iosize = mstat.f_iosize; 172 sbp->f_blocks = mstat.f_blocks; 173 sbp->f_bfree = mstat.f_bfree; 174 sbp->f_bavail = mstat.f_bavail; 175 sbp->f_bresvd = mstat.f_bresvd; 176 sbp->f_files = mstat.f_files; 177 sbp->f_ffree = mstat.f_ffree; 178 sbp->f_favail = mstat.f_favail; 179 sbp->f_fresvd = mstat.f_fresvd; 180 sbp->f_namemax = mstat.f_namemax; 181 copy_statvfs_info(sbp, mp); 182 return (0); 183 } 184 185 int 186 layerfs_sync(mp, waitfor, cred, p) 187 struct mount *mp; 188 int waitfor; 189 struct ucred *cred; 190 struct proc *p; 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) 201 struct mount *mp; 202 ino_t ino; 203 struct vnode **vpp; 204 { 205 int error; 206 struct vnode *vp; 207 208 if ((error = VFS_VGET(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, ino, &vp))) { 209 *vpp = NULL; 210 return (error); 211 } 212 if ((error = layer_node_create(mp, vp, vpp))) { 213 vput(vp); 214 *vpp = NULL; 215 return (error); 216 } 217 218 return (0); 219 } 220 221 int 222 layerfs_fhtovp(mp, fidp, vpp) 223 struct mount *mp; 224 struct fid *fidp; 225 struct vnode **vpp; 226 { 227 int error; 228 struct vnode *vp; 229 230 if ((error = VFS_FHTOVP(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, fidp, &vp))) 231 return (error); 232 233 if ((error = layer_node_create(mp, vp, vpp))) { 234 vput(vp); 235 *vpp = NULL; 236 return (error); 237 } 238 239 return (0); 240 } 241 242 int 243 layerfs_checkexp(mp, nam, exflagsp, credanonp) 244 struct mount *mp; 245 struct mbuf *nam; 246 int *exflagsp; 247 struct ucred**credanonp; 248 { 249 struct netcred *np; 250 struct layer_mount *lmp = MOUNTTOLAYERMOUNT(mp); 251 252 /* 253 * get the export permission structure for this <mp, client> tuple. 254 */ 255 if ((np = vfs_export_lookup(mp, &lmp->layerm_export, nam)) == NULL) 256 return (EACCES); 257 258 *exflagsp = np->netc_exflags; 259 *credanonp = &np->netc_anon; 260 return (0); 261 } 262 263 int 264 layerfs_vptofh(vp, fhp) 265 struct vnode *vp; 266 struct fid *fhp; 267 { 268 269 return (VFS_VPTOFH(LAYERVPTOLOWERVP(vp), fhp)); 270 } 271 272 SYSCTL_SETUP(sysctl_vfs_layerfs_setup, "sysctl vfs.layerfs subtree setup") 273 { 274 275 sysctl_createv(clog, 0, NULL, NULL, 276 CTLFLAG_PERMANENT, 277 CTLTYPE_NODE, "vfs", NULL, 278 NULL, 0, NULL, 0, 279 CTL_VFS, CTL_EOL); 280 sysctl_createv(clog, 0, NULL, NULL, 281 CTLFLAG_PERMANENT, 282 CTLTYPE_NODE, "layerfs", NULL, 283 NULL, 0, NULL, 0, 284 CTL_VFS, CTL_CREATE); 285 /* 286 * other subtrees should really be aliases to this, but since 287 * they can't tell if layerfs has been instantiated yet, they 288 * can't do that...not easily. not yet. :-) 289 */ 290 } 291
Indexes created Mon Sep 22 21:09:42 GMT 2025