overlay_vfsops.c revision 1.5.2.2
1 1.5.2.2 bouyer /* $NetBSD: overlay_vfsops.c,v 1.5.2.2 2000/11/20 18:09:47 bouyer Exp $ */ 2 1.5.2.2 bouyer 3 1.5.2.2 bouyer /* 4 1.5.2.2 bouyer * Copyright (c) 1999, 2000 National Aeronautics & Space Administration 5 1.5.2.2 bouyer * All rights reserved. 6 1.5.2.2 bouyer * 7 1.5.2.2 bouyer * This software was written by William Studenmund of the 8 1.5.2.2 bouyer * Numerical Aerospace Similation Facility, NASA Ames Research Center. 9 1.5.2.2 bouyer * 10 1.5.2.2 bouyer * Redistribution and use in source and binary forms, with or without 11 1.5.2.2 bouyer * modification, are permitted provided that the following conditions 12 1.5.2.2 bouyer * are met: 13 1.5.2.2 bouyer * 1. Redistributions of source code must retain the above copyright 14 1.5.2.2 bouyer * notice, this list of conditions and the following disclaimer. 15 1.5.2.2 bouyer * 2. Redistributions in binary form must reproduce the above copyright 16 1.5.2.2 bouyer * notice, this list of conditions and the following disclaimer in the 17 1.5.2.2 bouyer * documentation and/or other materials provided with the distribution. 18 1.5.2.2 bouyer * 3. Neither the name of the National Aeronautics & Space Administration 19 1.5.2.2 bouyer * nor the names of its contributors may be used to endorse or promote 20 1.5.2.2 bouyer * products derived from this software without specific prior written 21 1.5.2.2 bouyer * permission. 22 1.5.2.2 bouyer * 23 1.5.2.2 bouyer * THIS SOFTWARE IS PROVIDED BY THE NATIONAL AERONAUTICS & SPACE ADMINISTRATION 24 1.5.2.2 bouyer * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 1.5.2.2 bouyer * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 1.5.2.2 bouyer * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE ADMINISTRATION OR CONTRIB- 27 1.5.2.2 bouyer * UTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 28 1.5.2.2 bouyer * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 1.5.2.2 bouyer * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 1.5.2.2 bouyer * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 1.5.2.2 bouyer * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 1.5.2.2 bouyer * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 1.5.2.2 bouyer * POSSIBILITY OF SUCH DAMAGE. 34 1.5.2.2 bouyer */ 35 1.5.2.2 bouyer /* 36 1.5.2.2 bouyer * Copyright (c) 1992, 1993, 1995 37 1.5.2.2 bouyer * The Regents of the University of California. All rights reserved. 38 1.5.2.2 bouyer * 39 1.5.2.2 bouyer * This code is derived from software donated to Berkeley by 40 1.5.2.2 bouyer * Jan-Simon Pendry. 41 1.5.2.2 bouyer * 42 1.5.2.2 bouyer * Redistribution and use in source and binary forms, with or without 43 1.5.2.2 bouyer * modification, are permitted provided that the following conditions 44 1.5.2.2 bouyer * are met: 45 1.5.2.2 bouyer * 1. Redistributions of source code must retain the above copyright 46 1.5.2.2 bouyer * notice, this list of conditions and the following disclaimer. 47 1.5.2.2 bouyer * 2. Redistributions in binary form must reproduce the above copyright 48 1.5.2.2 bouyer * notice, this list of conditions and the following disclaimer in the 49 1.5.2.2 bouyer * documentation and/or other materials provided with the distribution. 50 1.5.2.2 bouyer * 3. All advertising materials mentioning features or use of this software 51 1.5.2.2 bouyer * must display the following acknowledgement: 52 1.5.2.2 bouyer * This product includes software developed by the University of 53 1.5.2.2 bouyer * California, Berkeley and its contributors. 54 1.5.2.2 bouyer * 4. Neither the name of the University nor the names of its contributors 55 1.5.2.2 bouyer * may be used to endorse or promote products derived from this software 56 1.5.2.2 bouyer * without specific prior written permission. 57 1.5.2.2 bouyer * 58 1.5.2.2 bouyer * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 59 1.5.2.2 bouyer * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 60 1.5.2.2 bouyer * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 61 1.5.2.2 bouyer * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 62 1.5.2.2 bouyer * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 63 1.5.2.2 bouyer * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 64 1.5.2.2 bouyer * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 65 1.5.2.2 bouyer * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 66 1.5.2.2 bouyer * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 67 1.5.2.2 bouyer * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 68 1.5.2.2 bouyer * SUCH DAMAGE. 69 1.5.2.2 bouyer * 70 1.5.2.2 bouyer * from: Id: lofs_vfsops.c,v 1.9 1992/05/30 10:26:24 jsp Exp 71 1.5.2.2 bouyer * from: @(#)lofs_vfsops.c 1.2 (Berkeley) 6/18/92 72 1.5.2.2 bouyer * @(#)null_vfsops.c 8.7 (Berkeley) 5/14/95 73 1.5.2.2 bouyer */ 74 1.5.2.2 bouyer 75 1.5.2.2 bouyer /* 76 1.5.2.2 bouyer * Null Layer 77 1.5.2.2 bouyer * (See null_vnops.c for a description of what this does.) 78 1.5.2.2 bouyer */ 79 1.5.2.2 bouyer 80 1.5.2.2 bouyer #include <sys/param.h> 81 1.5.2.2 bouyer #include <sys/systm.h> 82 1.5.2.2 bouyer #include <sys/time.h> 83 1.5.2.2 bouyer #include <sys/proc.h> 84 1.5.2.2 bouyer #include <sys/types.h> 85 1.5.2.2 bouyer #include <sys/vnode.h> 86 1.5.2.2 bouyer #include <sys/mount.h> 87 1.5.2.2 bouyer #include <sys/namei.h> 88 1.5.2.2 bouyer #include <sys/malloc.h> 89 1.5.2.2 bouyer #include <miscfs/overlay/overlay.h> 90 1.5.2.2 bouyer #include <miscfs/genfs/layer_extern.h> 91 1.5.2.2 bouyer 92 1.5.2.2 bouyer int ov_mount __P((struct mount *, const char *, void *, 93 1.5.2.2 bouyer struct nameidata *, struct proc *)); 94 1.5.2.2 bouyer int ov_unmount __P((struct mount *, int, struct proc *)); 95 1.5.2.2 bouyer 96 1.5.2.2 bouyer #define NOVERLAYNODECACHE 16 97 1.5.2.2 bouyer 98 1.5.2.2 bouyer /* 99 1.5.2.2 bouyer * Mount overlay layer 100 1.5.2.2 bouyer */ 101 1.5.2.2 bouyer int 102 1.5.2.2 bouyer ov_mount(mp, path, data, ndp, p) 103 1.5.2.2 bouyer struct mount *mp; 104 1.5.2.2 bouyer const char *path; 105 1.5.2.2 bouyer void *data; 106 1.5.2.2 bouyer struct nameidata *ndp; 107 1.5.2.2 bouyer struct proc *p; 108 1.5.2.2 bouyer { 109 1.5.2.2 bouyer int error = 0; 110 1.5.2.2 bouyer struct overlay_args args; 111 1.5.2.2 bouyer struct vnode *lowerrootvp, *vp; 112 1.5.2.2 bouyer struct overlay_mount *nmp; 113 1.5.2.2 bouyer struct layer_mount *lmp; 114 1.5.2.2 bouyer size_t size; 115 1.5.2.2 bouyer 116 1.5.2.2 bouyer #ifdef OVERLAYFS_DIAGNOSTIC 117 1.5.2.2 bouyer printf("ov_mount(mp = %p)\n", mp); 118 1.5.2.2 bouyer #endif 119 1.5.2.2 bouyer 120 1.5.2.2 bouyer /* 121 1.5.2.2 bouyer * Get argument 122 1.5.2.2 bouyer */ 123 1.5.2.2 bouyer error = copyin(data, (caddr_t)&args, sizeof(struct overlay_args)); 124 1.5.2.2 bouyer if (error) 125 1.5.2.2 bouyer return (error); 126 1.5.2.2 bouyer 127 1.5.2.2 bouyer /* 128 1.5.2.2 bouyer * Update only does export updating. 129 1.5.2.2 bouyer */ 130 1.5.2.2 bouyer if (mp->mnt_flag & MNT_UPDATE) { 131 1.5.2.2 bouyer lmp = MOUNTTOLAYERMOUNT(mp); 132 1.5.2.2 bouyer if (args.ova_target == 0) 133 1.5.2.2 bouyer return (vfs_export(mp, &lmp->layerm_export, 134 1.5.2.2 bouyer &args.la.export)); 135 1.5.2.2 bouyer else 136 1.5.2.2 bouyer return (EOPNOTSUPP); 137 1.5.2.2 bouyer } 138 1.5.2.2 bouyer 139 1.5.2.2 bouyer /* 140 1.5.2.2 bouyer * Find lower node 141 1.5.2.2 bouyer */ 142 1.5.2.2 bouyer lowerrootvp = mp->mnt_vnodecovered; 143 1.5.2.2 bouyer if ((error = vget(lowerrootvp, LK_EXCLUSIVE | LK_RETRY))) 144 1.5.2.2 bouyer return (error); 145 1.5.2.2 bouyer 146 1.5.2.2 bouyer /* 147 1.5.2.2 bouyer * First cut at fixing up upper mount point 148 1.5.2.2 bouyer */ 149 1.5.2.2 bouyer nmp = (struct overlay_mount *) malloc(sizeof(struct overlay_mount), 150 1.5.2.2 bouyer M_UFSMNT, M_WAITOK); /* XXX */ 151 1.5.2.2 bouyer memset((caddr_t)nmp, 0, sizeof(struct overlay_mount)); 152 1.5.2.2 bouyer 153 1.5.2.2 bouyer mp->mnt_data = (qaddr_t) nmp; 154 1.5.2.2 bouyer nmp->ovm_vfs = lowerrootvp->v_mount; 155 1.5.2.2 bouyer if (nmp->ovm_vfs->mnt_flag & MNT_LOCAL) 156 1.5.2.2 bouyer mp->mnt_flag |= MNT_LOCAL; 157 1.5.2.2 bouyer 158 1.5.2.2 bouyer /* 159 1.5.2.2 bouyer * Make sure that the mount point is sufficiently initialized 160 1.5.2.2 bouyer * that the node create call will work. 161 1.5.2.2 bouyer */ 162 1.5.2.2 bouyer vfs_getnewfsid(mp); 163 1.5.2.2 bouyer 164 1.5.2.2 bouyer nmp->ovm_size = sizeof (struct overlay_node); 165 1.5.2.2 bouyer nmp->ovm_tag = VT_OVERLAY; 166 1.5.2.2 bouyer nmp->ovm_bypass = layer_bypass; 167 1.5.2.2 bouyer nmp->ovm_alloc = layer_node_alloc; /* the default alloc is fine */ 168 1.5.2.2 bouyer nmp->ovm_vnodeop_p = overlay_vnodeop_p; 169 1.5.2.2 bouyer simple_lock_init(&nmp->ovm_hashlock); 170 1.5.2.2 bouyer nmp->ovm_node_hashtbl = hashinit(NOVERLAYNODECACHE, M_CACHE, M_WAITOK, 171 1.5.2.2 bouyer &nmp->ovm_node_hash); 172 1.5.2.2 bouyer 173 1.5.2.2 bouyer /* 174 1.5.2.2 bouyer * Fix up overlay node for root vnode 175 1.5.2.2 bouyer */ 176 1.5.2.2 bouyer error = layer_node_create(mp, lowerrootvp, &vp); 177 1.5.2.2 bouyer /* 178 1.5.2.2 bouyer * Make sure the fixup worked 179 1.5.2.2 bouyer */ 180 1.5.2.2 bouyer if (error) { 181 1.5.2.2 bouyer vput(lowerrootvp); 182 1.5.2.2 bouyer free(nmp, M_UFSMNT); /* XXX */ 183 1.5.2.2 bouyer return (error); 184 1.5.2.2 bouyer } 185 1.5.2.2 bouyer /* 186 1.5.2.2 bouyer * Unlock the node 187 1.5.2.2 bouyer */ 188 1.5.2.2 bouyer VOP_UNLOCK(vp, 0); 189 1.5.2.2 bouyer 190 1.5.2.2 bouyer /* 191 1.5.2.2 bouyer * Keep a held reference to the root vnode. 192 1.5.2.2 bouyer * It is vrele'd in ov_unmount. 193 1.5.2.2 bouyer */ 194 1.5.2.2 bouyer vp->v_flag |= VROOT; 195 1.5.2.2 bouyer nmp->ovm_rootvp = vp; 196 1.5.2.2 bouyer 197 1.5.2.2 bouyer (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 198 1.5.2.2 bouyer memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size); 199 1.5.2.2 bouyer (void) copyinstr(args.la.target, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 200 1.5.2.2 bouyer &size); 201 1.5.2.2 bouyer memset(mp->mnt_stat.f_mntfromname + size, 0, MNAMELEN - size); 202 1.5.2.2 bouyer #ifdef OVERLAYFS_DIAGNOSTIC 203 1.5.2.2 bouyer printf("ov_mount: lower %s, alias at %s\n", 204 1.5.2.2 bouyer mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname); 205 1.5.2.2 bouyer #endif 206 1.5.2.2 bouyer return (0); 207 1.5.2.2 bouyer } 208 1.5.2.2 bouyer 209 1.5.2.2 bouyer /* 210 1.5.2.2 bouyer * Free reference to overlay layer 211 1.5.2.2 bouyer */ 212 1.5.2.2 bouyer int 213 1.5.2.2 bouyer ov_unmount(mp, mntflags, p) 214 1.5.2.2 bouyer struct mount *mp; 215 1.5.2.2 bouyer int mntflags; 216 1.5.2.2 bouyer struct proc *p; 217 1.5.2.2 bouyer { 218 1.5.2.2 bouyer struct vnode *overlay_rootvp = MOUNTTOOVERLAYMOUNT(mp)->ovm_rootvp; 219 1.5.2.2 bouyer int error; 220 1.5.2.2 bouyer int flags = 0; 221 1.5.2.2 bouyer 222 1.5.2.2 bouyer #ifdef OVERLAYFS_DIAGNOSTIC 223 1.5.2.2 bouyer printf("ov_unmount(mp = %p)\n", mp); 224 1.5.2.2 bouyer #endif 225 1.5.2.2 bouyer 226 1.5.2.2 bouyer if (mntflags & MNT_FORCE) 227 1.5.2.2 bouyer flags |= FORCECLOSE; 228 1.5.2.2 bouyer 229 1.5.2.2 bouyer /* 230 1.5.2.2 bouyer * Clear out buffer cache. I don't think we 231 1.5.2.2 bouyer * ever get anything cached at this level at the 232 1.5.2.2 bouyer * moment, but who knows... 233 1.5.2.2 bouyer */ 234 1.5.2.2 bouyer #if 0 235 1.5.2.2 bouyer mntflushbuf(mp, 0); 236 1.5.2.2 bouyer if (mntinvalbuf(mp, 1)) 237 1.5.2.2 bouyer return (EBUSY); 238 1.5.2.2 bouyer #endif 239 1.5.2.2 bouyer if (overlay_rootvp->v_usecount > 1) 240 1.5.2.2 bouyer return (EBUSY); 241 1.5.2.2 bouyer if ((error = vflush(mp, overlay_rootvp, flags)) != 0) 242 1.5.2.2 bouyer return (error); 243 1.5.2.2 bouyer 244 1.5.2.2 bouyer #ifdef OVERLAYFS_DIAGNOSTIC 245 1.5.2.2 bouyer vprint("alias root of lower", overlay_rootvp); 246 1.5.2.2 bouyer #endif 247 1.5.2.2 bouyer /* 248 1.5.2.2 bouyer * Release reference on underlying root vnode 249 1.5.2.2 bouyer */ 250 1.5.2.2 bouyer vrele(overlay_rootvp); 251 1.5.2.2 bouyer /* 252 1.5.2.2 bouyer * And blow it away for future re-use 253 1.5.2.2 bouyer */ 254 1.5.2.2 bouyer vgone(overlay_rootvp); 255 1.5.2.2 bouyer /* 256 1.5.2.2 bouyer * Finally, throw away the overlay_mount structure 257 1.5.2.2 bouyer */ 258 1.5.2.2 bouyer free(mp->mnt_data, M_UFSMNT); /* XXX */ 259 1.5.2.2 bouyer mp->mnt_data = 0; 260 1.5.2.2 bouyer return 0; 261 1.5.2.2 bouyer } 262 1.5.2.2 bouyer 263 1.5.2.2 bouyer extern struct vnodeopv_desc overlay_vnodeop_opv_desc; 264 1.5.2.2 bouyer 265 1.5.2.2 bouyer struct vnodeopv_desc *ov_vnodeopv_descs[] = { 266 1.5.2.2 bouyer &overlay_vnodeop_opv_desc, 267 1.5.2.2 bouyer NULL, 268 1.5.2.2 bouyer }; 269 1.5.2.2 bouyer 270 1.5.2.2 bouyer struct vfsops overlay_vfsops = { 271 1.5.2.2 bouyer MOUNT_OVERLAY, 272 1.5.2.2 bouyer ov_mount, 273 1.5.2.2 bouyer layerfs_start, 274 1.5.2.2 bouyer ov_unmount, 275 1.5.2.2 bouyer layerfs_root, 276 1.5.2.2 bouyer layerfs_quotactl, 277 1.5.2.2 bouyer layerfs_statfs, 278 1.5.2.2 bouyer layerfs_sync, 279 1.5.2.2 bouyer layerfs_vget, 280 1.5.2.2 bouyer layerfs_fhtovp, 281 1.5.2.2 bouyer layerfs_vptofh, 282 1.5.2.2 bouyer layerfs_init, 283 1.5.2.2 bouyer layerfs_done, 284 1.5.2.2 bouyer layerfs_sysctl, 285 1.5.2.2 bouyer NULL, /* vfs_mountroot */ 286 1.5.2.2 bouyer layerfs_checkexp, 287 1.5.2.2 bouyer ov_vnodeopv_descs, 288 1.5.2.2 bouyer }; 289
Indexes created Mon Oct 20 20:10:13 GMT 2025