1 /* $NetBSD: umap_vfsops.c,v 1.39 2003/06/29 22:31:49 fvdl 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 1.39 2003/06/29 22:31:49 fvdl 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 int error; 80 #ifdef UMAPFS_DIAGNOSTIC 81 int i; 82 #endif 83 if (mp->mnt_flag & MNT_GETARGS) { 84 amp = MOUNTTOUMAPMOUNT(mp); 85 if (amp == NULL) 86 return EIO; 87 args.la.target = NULL; 88 vfs_showexport(mp, &args.la.export, &->umapm_export); 89 args.nentries = amp->info_nentries; 90 args.gnentries = amp->info_gnentries; 91 return copyout(&args, data, sizeof(args)); 92 } 93 94 /* only for root */ 95 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 96 return error; 97 98 #ifdef UMAPFS_DIAGNOSTIC 99 printf("umapfs_mount(mp = %p)\n", mp); 100 #endif 101 102 /* 103 * Get argument 104 */ 105 error = copyin(data, (caddr_t)&args, sizeof(struct umap_args)); 106 if (error) 107 return (error); 108 109 /* 110 * Update only does export updating. 111 */ 112 if (mp->mnt_flag & MNT_UPDATE) { 113 amp = MOUNTTOUMAPMOUNT(mp); 114 if (args.umap_target == 0) 115 return (vfs_export(mp, &->umapm_export, 116 &args.umap_export)); 117 else 118 return (EOPNOTSUPP); 119 } 120 121 /* 122 * Find lower node 123 */ 124 NDINIT(ndp, LOOKUP, FOLLOW|LOCKLEAF, 125 UIO_USERSPACE, args.umap_target, p); 126 if ((error = namei(ndp)) != 0) 127 return (error); 128 129 /* 130 * Sanity check on lower vnode 131 */ 132 lowerrootvp = ndp->ni_vp; 133 #ifdef UMAPFS_DIAGNOSTIC 134 printf("vp = %p, check for VDIR...\n", lowerrootvp); 135 #endif 136 137 if (lowerrootvp->v_type != VDIR) { 138 vput(lowerrootvp); 139 return (EINVAL); 140 } 141 142 #ifdef UMAPFS_DIAGNOSTIC 143 printf("mp = %p\n", mp); 144 #endif 145 146 amp = (struct umap_mount *) malloc(sizeof(struct umap_mount), 147 M_UFSMNT, M_WAITOK); /* XXX */ 148 memset((caddr_t)amp, 0, sizeof(struct umap_mount)); 149 150 mp->mnt_data = amp; 151 amp->umapm_vfs = lowerrootvp->v_mount; 152 if (amp->umapm_vfs->mnt_flag & MNT_LOCAL) 153 mp->mnt_flag |= MNT_LOCAL; 154 155 /* 156 * Now copy in the number of entries and maps for umap mapping. 157 */ 158 if (args.nentries > MAPFILEENTRIES || args.gnentries > GMAPFILEENTRIES) { 159 vput(lowerrootvp); 160 return (error); 161 } 162 163 amp->info_nentries = args.nentries; 164 amp->info_gnentries = args.gnentries; 165 error = copyin(args.mapdata, (caddr_t)amp->info_mapdata, 166 2*sizeof(u_long)*args.nentries); 167 if (error) { 168 vput(lowerrootvp); 169 return (error); 170 } 171 172 #ifdef UMAPFS_DIAGNOSTIC 173 printf("umap_mount:nentries %d\n",args.nentries); 174 for (i = 0; i < args.nentries; i++) 175 printf(" %ld maps to %ld\n", amp->info_mapdata[i][0], 176 amp->info_mapdata[i][1]); 177 #endif 178 179 error = copyin(args.gmapdata, (caddr_t)amp->info_gmapdata, 180 2*sizeof(u_long)*args.gnentries); 181 if (error) { 182 vput(lowerrootvp); 183 return (error); 184 } 185 186 #ifdef UMAPFS_DIAGNOSTIC 187 printf("umap_mount:gnentries %d\n",args.gnentries); 188 for (i = 0; i < args.gnentries; i++) 189 printf("\tgroup %ld maps to %ld\n", 190 amp->info_gmapdata[i][0], 191 amp->info_gmapdata[i][1]); 192 #endif 193 194 /* 195 * Make sure the mount point's sufficiently initialized 196 * that the node create call will work. 197 */ 198 vfs_getnewfsid(mp); 199 amp->umapm_size = sizeof(struct umap_node); 200 amp->umapm_tag = VT_UMAP; 201 amp->umapm_bypass = umap_bypass; 202 amp->umapm_alloc = layer_node_alloc; /* the default alloc is fine */ 203 amp->umapm_vnodeop_p = umap_vnodeop_p; 204 simple_lock_init(&->umapm_hashlock); 205 amp->umapm_node_hashtbl = hashinit(NUMAPNODECACHE, HASH_LIST, M_CACHE, 206 M_WAITOK, &->umapm_node_hash); 207 208 209 /* 210 * fix up umap node for root vnode. 211 */ 212 error = layer_node_create(mp, lowerrootvp, &vp); 213 /* 214 * Make sure the node alias worked 215 */ 216 if (error) { 217 vput(lowerrootvp); 218 free(amp, M_UFSMNT); /* XXX */ 219 return (error); 220 } 221 /* 222 * Unlock the node (either the lower or the alias) 223 */ 224 VOP_UNLOCK(vp, 0); 225 226 /* 227 * Keep a held reference to the root vnode. 228 * It is vrele'd in umapfs_unmount. 229 */ 230 vp->v_flag |= VROOT; 231 amp->umapm_rootvp = vp; 232 233 error = set_statfs_info(path, UIO_USERSPACE, args.umap_target, 234 UIO_USERSPACE, mp, p); 235 #ifdef UMAPFS_DIAGNOSTIC 236 printf("umapfs_mount: lower %s, alias at %s\n", 237 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname); 238 #endif 239 return error; 240 } 241 242 /* 243 * Free reference to umap layer 244 */ 245 int 246 umapfs_unmount(mp, mntflags, p) 247 struct mount *mp; 248 int mntflags; 249 struct proc *p; 250 { 251 struct vnode *rootvp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp; 252 int error; 253 int flags = 0; 254 255 #ifdef UMAPFS_DIAGNOSTIC 256 printf("umapfs_unmount(mp = %p)\n", mp); 257 #endif 258 259 if (mntflags & MNT_FORCE) 260 flags |= FORCECLOSE; 261 262 /* 263 * Clear out buffer cache. I don't think we 264 * ever get anything cached at this level at the 265 * moment, but who knows... 266 */ 267 #ifdef notyet 268 mntflushbuf(mp, 0); 269 if (mntinvalbuf(mp, 1)) 270 return (EBUSY); 271 #endif 272 if (rootvp->v_usecount > 1) 273 return (EBUSY); 274 if ((error = vflush(mp, rootvp, flags)) != 0) 275 return (error); 276 277 #ifdef UMAPFS_DIAGNOSTIC 278 vprint("alias root of lower", rootvp); 279 #endif 280 /* 281 * Release reference on underlying root vnode 282 */ 283 vrele(rootvp); 284 /* 285 * And blow it away for future re-use 286 */ 287 vgone(rootvp); 288 /* 289 * Finally, throw away the umap_mount structure 290 */ 291 free(mp->mnt_data, M_UFSMNT); /* XXX */ 292 mp->mnt_data = 0; 293 return (0); 294 } 295 296 extern const struct vnodeopv_desc umapfs_vnodeop_opv_desc; 297 298 const struct vnodeopv_desc * const umapfs_vnodeopv_descs[] = { 299 &umapfs_vnodeop_opv_desc, 300 NULL, 301 }; 302 303 struct vfsops umapfs_vfsops = { 304 MOUNT_UMAP, 305 umapfs_mount, 306 layerfs_start, 307 umapfs_unmount, 308 layerfs_root, 309 layerfs_quotactl, 310 layerfs_statfs, 311 layerfs_sync, 312 layerfs_vget, 313 layerfs_fhtovp, 314 layerfs_vptofh, 315 layerfs_init, 316 NULL, 317 layerfs_done, 318 layerfs_sysctl, 319 NULL, /* vfs_mountroot */ 320 layerfs_checkexp, 321 umapfs_vnodeopv_descs, 322 }; 323