1 /* $NetBSD: umap_vfsops.c,v 1.33 2001/11/15 09:48:23 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software donated to Berkeley by 8 * the UCLA Ficus project. 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * from: @(#)null_vfsops.c 1.5 (Berkeley) 7/10/92 39 * @(#)umap_vfsops.c 8.8 (Berkeley) 5/14/95 40 */ 41 42 /* 43 * Umap Layer 44 * (See mount_umap(8) for a description of this layer.) 45 */ 46 47 #include <sys/cdefs.h> 48 __KERNEL_RCSID(0, "$NetBSD: umap_vfsops.c,v 1.33 2001/11/15 09:48:23 lukem Exp $"); 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/proc.h> 53 #include <sys/time.h> 54 #include <sys/vnode.h> 55 #include <sys/mount.h> 56 #include <sys/namei.h> 57 #include <sys/malloc.h> 58 #include <miscfs/umapfs/umap.h> 59 #include <miscfs/genfs/layer_extern.h> 60 61 int umapfs_mount __P((struct mount *, const char *, void *, 62 struct nameidata *, struct proc *)); 63 int umapfs_unmount __P((struct mount *, int, struct proc *)); 64 65 /* 66 * Mount umap layer 67 */ 68 int 69 umapfs_mount(mp, path, data, ndp, p) 70 struct mount *mp; 71 const char *path; 72 void *data; 73 struct nameidata *ndp; 74 struct proc *p; 75 { 76 struct umap_args args; 77 struct vnode *lowerrootvp, *vp; 78 struct umap_mount *amp; 79 size_t size; 80 int error; 81 #ifdef UMAPFS_DIAGNOSTIC 82 int i; 83 #endif 84 85 /* only for root */ 86 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 87 return error; 88 89 #ifdef UMAPFS_DIAGNOSTIC 90 printf("umapfs_mount(mp = %p)\n", mp); 91 #endif 92 93 /* 94 * Get argument 95 */ 96 error = copyin(data, (caddr_t)&args, sizeof(struct umap_args)); 97 if (error) 98 return (error); 99 100 /* 101 * Update only does export updating. 102 */ 103 if (mp->mnt_flag & MNT_UPDATE) { 104 amp = MOUNTTOUMAPMOUNT(mp); 105 if (args.umap_target == 0) 106 return (vfs_export(mp, &->umapm_export, 107 &args.umap_export)); 108 else 109 return (EOPNOTSUPP); 110 } 111 112 /* 113 * Find lower node 114 */ 115 NDINIT(ndp, LOOKUP, FOLLOW|LOCKLEAF, 116 UIO_USERSPACE, args.umap_target, p); 117 if ((error = namei(ndp)) != 0) 118 return (error); 119 120 /* 121 * Sanity check on lower vnode 122 */ 123 lowerrootvp = ndp->ni_vp; 124 #ifdef UMAPFS_DIAGNOSTIC 125 printf("vp = %p, check for VDIR...\n", lowerrootvp); 126 #endif 127 128 if (lowerrootvp->v_type != VDIR) { 129 vput(lowerrootvp); 130 return (EINVAL); 131 } 132 133 #ifdef UMAPFS_DIAGNOSTIC 134 printf("mp = %p\n", mp); 135 #endif 136 137 amp = (struct umap_mount *) malloc(sizeof(struct umap_mount), 138 M_UFSMNT, M_WAITOK); /* XXX */ 139 memset((caddr_t)amp, 0, sizeof(struct umap_mount)); 140 141 mp->mnt_data = (qaddr_t) amp; 142 amp->umapm_vfs = lowerrootvp->v_mount; 143 if (amp->umapm_vfs->mnt_flag & MNT_LOCAL) 144 mp->mnt_flag |= MNT_LOCAL; 145 146 /* 147 * Now copy in the number of entries and maps for umap mapping. 148 */ 149 if (args.nentries > MAPFILEENTRIES || args.gnentries > GMAPFILEENTRIES) { 150 vput(lowerrootvp); 151 return (error); 152 } 153 154 amp->info_nentries = args.nentries; 155 amp->info_gnentries = args.gnentries; 156 error = copyin(args.mapdata, (caddr_t)amp->info_mapdata, 157 2*sizeof(u_long)*args.nentries); 158 if (error) { 159 vput(lowerrootvp); 160 return (error); 161 } 162 163 #ifdef UMAPFS_DIAGNOSTIC 164 printf("umap_mount:nentries %d\n",args.nentries); 165 for (i = 0; i < args.nentries; i++) 166 printf(" %ld maps to %ld\n", amp->info_mapdata[i][0], 167 amp->info_mapdata[i][1]); 168 #endif 169 170 error = copyin(args.gmapdata, (caddr_t)amp->info_gmapdata, 171 2*sizeof(u_long)*args.gnentries); 172 if (error) { 173 vput(lowerrootvp); 174 return (error); 175 } 176 177 #ifdef UMAPFS_DIAGNOSTIC 178 printf("umap_mount:gnentries %d\n",args.gnentries); 179 for (i = 0; i < args.gnentries; i++) 180 printf("\tgroup %ld maps to %ld\n", 181 amp->info_gmapdata[i][0], 182 amp->info_gmapdata[i][1]); 183 #endif 184 185 /* 186 * Make sure the mount point's sufficiently initialized 187 * that the node create call will work. 188 */ 189 vfs_getnewfsid(mp); 190 amp->umapm_size = sizeof(struct umap_node); 191 amp->umapm_tag = VT_UMAP; 192 amp->umapm_bypass = umap_bypass; 193 amp->umapm_alloc = layer_node_alloc; /* the default alloc is fine */ 194 amp->umapm_vnodeop_p = umap_vnodeop_p; 195 simple_lock_init(&->umapm_hashlock); 196 amp->umapm_node_hashtbl = hashinit(NUMAPNODECACHE, HASH_LIST, M_CACHE, 197 M_WAITOK, &->umapm_node_hash); 198 199 200 /* 201 * fix up umap node for root vnode. 202 */ 203 error = layer_node_create(mp, lowerrootvp, &vp); 204 /* 205 * Make sure the node alias worked 206 */ 207 if (error) { 208 vput(lowerrootvp); 209 free(amp, M_UFSMNT); /* XXX */ 210 return (error); 211 } 212 /* 213 * Unlock the node (either the lower or the alias) 214 */ 215 VOP_UNLOCK(vp, 0); 216 217 /* 218 * Keep a held reference to the root vnode. 219 * It is vrele'd in umapfs_unmount. 220 */ 221 vp->v_flag |= VROOT; 222 amp->umapm_rootvp = vp; 223 224 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 225 memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size); 226 (void) copyinstr(args.umap_target, mp->mnt_stat.f_mntfromname, 227 MNAMELEN - 1, &size); 228 memset(mp->mnt_stat.f_mntfromname + size, 0, MNAMELEN - size); 229 #ifdef UMAPFS_DIAGNOSTIC 230 printf("umapfs_mount: lower %s, alias at %s\n", 231 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname); 232 #endif 233 return (0); 234 } 235 236 /* 237 * Free reference to umap layer 238 */ 239 int 240 umapfs_unmount(mp, mntflags, p) 241 struct mount *mp; 242 int mntflags; 243 struct proc *p; 244 { 245 struct vnode *rootvp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp; 246 int error; 247 int flags = 0; 248 249 #ifdef UMAPFS_DIAGNOSTIC 250 printf("umapfs_unmount(mp = %p)\n", mp); 251 #endif 252 253 if (mntflags & MNT_FORCE) 254 flags |= FORCECLOSE; 255 256 /* 257 * Clear out buffer cache. I don't think we 258 * ever get anything cached at this level at the 259 * moment, but who knows... 260 */ 261 #ifdef notyet 262 mntflushbuf(mp, 0); 263 if (mntinvalbuf(mp, 1)) 264 return (EBUSY); 265 #endif 266 if (rootvp->v_usecount > 1) 267 return (EBUSY); 268 if ((error = vflush(mp, rootvp, flags)) != 0) 269 return (error); 270 271 #ifdef UMAPFS_DIAGNOSTIC 272 vprint("alias root of lower", rootvp); 273 #endif 274 /* 275 * Release reference on underlying root vnode 276 */ 277 vrele(rootvp); 278 /* 279 * And blow it away for future re-use 280 */ 281 vgone(rootvp); 282 /* 283 * Finally, throw away the umap_mount structure 284 */ 285 free(mp->mnt_data, M_UFSMNT); /* XXX */ 286 mp->mnt_data = 0; 287 return (0); 288 } 289 290 extern const struct vnodeopv_desc umapfs_vnodeop_opv_desc; 291 292 const struct vnodeopv_desc * const umapfs_vnodeopv_descs[] = { 293 &umapfs_vnodeop_opv_desc, 294 NULL, 295 }; 296 297 struct vfsops umapfs_vfsops = { 298 MOUNT_UMAP, 299 umapfs_mount, 300 layerfs_start, 301 umapfs_unmount, 302 layerfs_root, 303 layerfs_quotactl, 304 layerfs_statfs, 305 layerfs_sync, 306 layerfs_vget, 307 layerfs_fhtovp, 308 layerfs_vptofh, 309 layerfs_init, 310 NULL, 311 layerfs_done, 312 layerfs_sysctl, 313 NULL, /* vfs_mountroot */ 314 layerfs_checkexp, 315 umapfs_vnodeopv_descs, 316 }; 317