1 /* $NetBSD: umap_vfsops.c,v 1.35 2002/09/21 18:09:31 christos 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 1.35 2002/09/21 18:09:31 christos 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 if (mp->mnt_flag & MNT_GETARGS) { 85 amp = MOUNTTOUMAPMOUNT(mp); 86 if (amp == NULL) 87 return EIO; 88 args.la.target = NULL; 89 vfs_showexport(mp, &args.la.export, &->umapm_export); 90 args.nentries = amp->info_nentries; 91 args.gnentries = amp->info_gnentries; 92 return copyout(&args, data, sizeof(args)); 93 } 94 95 /* only for root */ 96 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 97 return error; 98 99 #ifdef UMAPFS_DIAGNOSTIC 100 printf("umapfs_mount(mp = %p)\n", mp); 101 #endif 102 103 /* 104 * Get argument 105 */ 106 error = copyin(data, (caddr_t)&args, sizeof(struct umap_args)); 107 if (error) 108 return (error); 109 110 /* 111 * Update only does export updating. 112 */ 113 if (mp->mnt_flag & MNT_UPDATE) { 114 amp = MOUNTTOUMAPMOUNT(mp); 115 if (args.umap_target == 0) 116 return (vfs_export(mp, &->umapm_export, 117 &args.umap_export)); 118 else 119 return (EOPNOTSUPP); 120 } 121 122 /* 123 * Find lower node 124 */ 125 NDINIT(ndp, LOOKUP, FOLLOW|LOCKLEAF, 126 UIO_USERSPACE, args.umap_target, p); 127 if ((error = namei(ndp)) != 0) 128 return (error); 129 130 /* 131 * Sanity check on lower vnode 132 */ 133 lowerrootvp = ndp->ni_vp; 134 #ifdef UMAPFS_DIAGNOSTIC 135 printf("vp = %p, check for VDIR...\n", lowerrootvp); 136 #endif 137 138 if (lowerrootvp->v_type != VDIR) { 139 vput(lowerrootvp); 140 return (EINVAL); 141 } 142 143 #ifdef UMAPFS_DIAGNOSTIC 144 printf("mp = %p\n", mp); 145 #endif 146 147 amp = (struct umap_mount *) malloc(sizeof(struct umap_mount), 148 M_UFSMNT, M_WAITOK); /* XXX */ 149 memset((caddr_t)amp, 0, sizeof(struct umap_mount)); 150 151 mp->mnt_data = amp; 152 amp->umapm_vfs = lowerrootvp->v_mount; 153 if (amp->umapm_vfs->mnt_flag & MNT_LOCAL) 154 mp->mnt_flag |= MNT_LOCAL; 155 156 /* 157 * Now copy in the number of entries and maps for umap mapping. 158 */ 159 if (args.nentries > MAPFILEENTRIES || args.gnentries > GMAPFILEENTRIES) { 160 vput(lowerrootvp); 161 return (error); 162 } 163 164 amp->info_nentries = args.nentries; 165 amp->info_gnentries = args.gnentries; 166 error = copyin(args.mapdata, (caddr_t)amp->info_mapdata, 167 2*sizeof(u_long)*args.nentries); 168 if (error) { 169 vput(lowerrootvp); 170 return (error); 171 } 172 173 #ifdef UMAPFS_DIAGNOSTIC 174 printf("umap_mount:nentries %d\n",args.nentries); 175 for (i = 0; i < args.nentries; i++) 176 printf(" %ld maps to %ld\n", amp->info_mapdata[i][0], 177 amp->info_mapdata[i][1]); 178 #endif 179 180 error = copyin(args.gmapdata, (caddr_t)amp->info_gmapdata, 181 2*sizeof(u_long)*args.gnentries); 182 if (error) { 183 vput(lowerrootvp); 184 return (error); 185 } 186 187 #ifdef UMAPFS_DIAGNOSTIC 188 printf("umap_mount:gnentries %d\n",args.gnentries); 189 for (i = 0; i < args.gnentries; i++) 190 printf("\tgroup %ld maps to %ld\n", 191 amp->info_gmapdata[i][0], 192 amp->info_gmapdata[i][1]); 193 #endif 194 195 /* 196 * Make sure the mount point's sufficiently initialized 197 * that the node create call will work. 198 */ 199 vfs_getnewfsid(mp); 200 amp->umapm_size = sizeof(struct umap_node); 201 amp->umapm_tag = VT_UMAP; 202 amp->umapm_bypass = umap_bypass; 203 amp->umapm_alloc = layer_node_alloc; /* the default alloc is fine */ 204 amp->umapm_vnodeop_p = umap_vnodeop_p; 205 simple_lock_init(&->umapm_hashlock); 206 amp->umapm_node_hashtbl = hashinit(NUMAPNODECACHE, HASH_LIST, M_CACHE, 207 M_WAITOK, &->umapm_node_hash); 208 209 210 /* 211 * fix up umap node for root vnode. 212 */ 213 error = layer_node_create(mp, lowerrootvp, &vp); 214 /* 215 * Make sure the node alias worked 216 */ 217 if (error) { 218 vput(lowerrootvp); 219 free(amp, M_UFSMNT); /* XXX */ 220 return (error); 221 } 222 /* 223 * Unlock the node (either the lower or the alias) 224 */ 225 VOP_UNLOCK(vp, 0); 226 227 /* 228 * Keep a held reference to the root vnode. 229 * It is vrele'd in umapfs_unmount. 230 */ 231 vp->v_flag |= VROOT; 232 amp->umapm_rootvp = vp; 233 234 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 235 memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size); 236 (void) copyinstr(args.umap_target, mp->mnt_stat.f_mntfromname, 237 MNAMELEN - 1, &size); 238 memset(mp->mnt_stat.f_mntfromname + size, 0, MNAMELEN - size); 239 #ifdef UMAPFS_DIAGNOSTIC 240 printf("umapfs_mount: lower %s, alias at %s\n", 241 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname); 242 #endif 243 return (0); 244 } 245 246 /* 247 * Free reference to umap layer 248 */ 249 int 250 umapfs_unmount(mp, mntflags, p) 251 struct mount *mp; 252 int mntflags; 253 struct proc *p; 254 { 255 struct vnode *rootvp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp; 256 int error; 257 int flags = 0; 258 259 #ifdef UMAPFS_DIAGNOSTIC 260 printf("umapfs_unmount(mp = %p)\n", mp); 261 #endif 262 263 if (mntflags & MNT_FORCE) 264 flags |= FORCECLOSE; 265 266 /* 267 * Clear out buffer cache. I don't think we 268 * ever get anything cached at this level at the 269 * moment, but who knows... 270 */ 271 #ifdef notyet 272 mntflushbuf(mp, 0); 273 if (mntinvalbuf(mp, 1)) 274 return (EBUSY); 275 #endif 276 if (rootvp->v_usecount > 1) 277 return (EBUSY); 278 if ((error = vflush(mp, rootvp, flags)) != 0) 279 return (error); 280 281 #ifdef UMAPFS_DIAGNOSTIC 282 vprint("alias root of lower", rootvp); 283 #endif 284 /* 285 * Release reference on underlying root vnode 286 */ 287 vrele(rootvp); 288 /* 289 * And blow it away for future re-use 290 */ 291 vgone(rootvp); 292 /* 293 * Finally, throw away the umap_mount structure 294 */ 295 free(mp->mnt_data, M_UFSMNT); /* XXX */ 296 mp->mnt_data = 0; 297 return (0); 298 } 299 300 extern const struct vnodeopv_desc umapfs_vnodeop_opv_desc; 301 302 const struct vnodeopv_desc * const umapfs_vnodeopv_descs[] = { 303 &umapfs_vnodeop_opv_desc, 304 NULL, 305 }; 306 307 struct vfsops umapfs_vfsops = { 308 MOUNT_UMAP, 309 umapfs_mount, 310 layerfs_start, 311 umapfs_unmount, 312 layerfs_root, 313 layerfs_quotactl, 314 layerfs_statfs, 315 layerfs_sync, 316 layerfs_vget, 317 layerfs_fhtovp, 318 layerfs_vptofh, 319 layerfs_init, 320 NULL, 321 layerfs_done, 322 layerfs_sysctl, 323 NULL, /* vfs_mountroot */ 324 layerfs_checkexp, 325 umapfs_vnodeopv_descs, 326 }; 327