umap_vfsops.c revision 1.38
1 /* $NetBSD: umap_vfsops.c,v 1.38 2003/06/29 02:17:00 thorpej 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 1.38 2003/06/29 02:17:00 thorpej 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 lwp *)); 63 int umapfs_unmount __P((struct mount *, int, struct lwp *)); 64 65 /* 66 * Mount umap layer 67 */ 68 int 69 umapfs_mount(mp, path, data, ndp, l) 70 struct mount *mp; 71 const char *path; 72 void *data; 73 struct nameidata *ndp; 74 struct lwp *l; 75 { 76 struct umap_args args; 77 struct vnode *lowerrootvp, *vp; 78 struct umap_mount *amp; 79 struct proc *p; 80 int error; 81 #ifdef UMAPFS_DIAGNOSTIC 82 int i; 83 #endif 84 85 if (mp->mnt_flag & MNT_GETARGS) { 86 amp = MOUNTTOUMAPMOUNT(mp); 87 if (amp == NULL) 88 return EIO; 89 args.la.target = NULL; 90 vfs_showexport(mp, &args.la.export, &->umapm_export); 91 args.nentries = amp->info_nentries; 92 args.gnentries = amp->info_gnentries; 93 return copyout(&args, data, sizeof(args)); 94 } 95 96 /* only for root */ 97 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 98 return error; 99 100 #ifdef UMAPFS_DIAGNOSTIC 101 printf("umapfs_mount(mp = %p)\n", mp); 102 #endif 103 104 /* 105 * Get argument 106 */ 107 error = copyin(data, (caddr_t)&args, sizeof(struct umap_args)); 108 if (error) 109 return (error); 110 111 /* 112 * Update only does export updating. 113 */ 114 if (mp->mnt_flag & MNT_UPDATE) { 115 amp = MOUNTTOUMAPMOUNT(mp); 116 if (args.umap_target == 0) 117 return (vfs_export(mp, &->umapm_export, 118 &args.umap_export)); 119 else 120 return (EOPNOTSUPP); 121 } 122 123 /* 124 * Find lower node 125 */ 126 NDINIT(ndp, LOOKUP, FOLLOW|LOCKLEAF, 127 UIO_USERSPACE, args.umap_target, l); 128 if ((error = namei(ndp)) != 0) 129 return (error); 130 131 /* 132 * Sanity check on lower vnode 133 */ 134 lowerrootvp = ndp->ni_vp; 135 #ifdef UMAPFS_DIAGNOSTIC 136 printf("vp = %p, check for VDIR...\n", lowerrootvp); 137 #endif 138 139 if (lowerrootvp->v_type != VDIR) { 140 vput(lowerrootvp); 141 return (EINVAL); 142 } 143 144 #ifdef UMAPFS_DIAGNOSTIC 145 printf("mp = %p\n", mp); 146 #endif 147 148 amp = (struct umap_mount *) malloc(sizeof(struct umap_mount), 149 M_UFSMNT, M_WAITOK); /* XXX */ 150 memset((caddr_t)amp, 0, sizeof(struct umap_mount)); 151 152 mp->mnt_data = amp; 153 amp->umapm_vfs = lowerrootvp->v_mount; 154 if (amp->umapm_vfs->mnt_flag & MNT_LOCAL) 155 mp->mnt_flag |= MNT_LOCAL; 156 157 /* 158 * Now copy in the number of entries and maps for umap mapping. 159 */ 160 if (args.nentries > MAPFILEENTRIES || args.gnentries > GMAPFILEENTRIES) { 161 vput(lowerrootvp); 162 return (error); 163 } 164 165 amp->info_nentries = args.nentries; 166 amp->info_gnentries = args.gnentries; 167 error = copyin(args.mapdata, (caddr_t)amp->info_mapdata, 168 2*sizeof(u_long)*args.nentries); 169 if (error) { 170 vput(lowerrootvp); 171 return (error); 172 } 173 174 #ifdef UMAPFS_DIAGNOSTIC 175 printf("umap_mount:nentries %d\n",args.nentries); 176 for (i = 0; i < args.nentries; i++) 177 printf(" %ld maps to %ld\n", amp->info_mapdata[i][0], 178 amp->info_mapdata[i][1]); 179 #endif 180 181 error = copyin(args.gmapdata, (caddr_t)amp->info_gmapdata, 182 2*sizeof(u_long)*args.gnentries); 183 if (error) { 184 vput(lowerrootvp); 185 return (error); 186 } 187 188 #ifdef UMAPFS_DIAGNOSTIC 189 printf("umap_mount:gnentries %d\n",args.gnentries); 190 for (i = 0; i < args.gnentries; i++) 191 printf("\tgroup %ld maps to %ld\n", 192 amp->info_gmapdata[i][0], 193 amp->info_gmapdata[i][1]); 194 #endif 195 196 /* 197 * Make sure the mount point's sufficiently initialized 198 * that the node create call will work. 199 */ 200 vfs_getnewfsid(mp); 201 amp->umapm_size = sizeof(struct umap_node); 202 amp->umapm_tag = VT_UMAP; 203 amp->umapm_bypass = umap_bypass; 204 amp->umapm_alloc = layer_node_alloc; /* the default alloc is fine */ 205 amp->umapm_vnodeop_p = umap_vnodeop_p; 206 simple_lock_init(&->umapm_hashlock); 207 amp->umapm_node_hashtbl = hashinit(NUMAPNODECACHE, HASH_LIST, M_CACHE, 208 M_WAITOK, &->umapm_node_hash); 209 210 211 /* 212 * fix up umap node for root vnode. 213 */ 214 error = layer_node_create(mp, lowerrootvp, &vp); 215 /* 216 * Make sure the node alias worked 217 */ 218 if (error) { 219 vput(lowerrootvp); 220 free(amp, M_UFSMNT); /* XXX */ 221 return (error); 222 } 223 /* 224 * Unlock the node (either the lower or the alias) 225 */ 226 VOP_UNLOCK(vp, 0); 227 228 /* 229 * Keep a held reference to the root vnode. 230 * It is vrele'd in umapfs_unmount. 231 */ 232 vp->v_flag |= VROOT; 233 amp->umapm_rootvp = vp; 234 235 error = set_statfs_info(path, UIO_USERSPACE, args.umap_target, 236 UIO_USERSPACE, mp, l); 237 #ifdef UMAPFS_DIAGNOSTIC 238 printf("umapfs_mount: lower %s, alias at %s\n", 239 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname); 240 #endif 241 return error; 242 } 243 244 /* 245 * Free reference to umap layer 246 */ 247 int 248 umapfs_unmount(mp, mntflags, l) 249 struct mount *mp; 250 int mntflags; 251 struct lwp *l; 252 { 253 struct vnode *rootvp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp; 254 int error; 255 int flags = 0; 256 257 #ifdef UMAPFS_DIAGNOSTIC 258 printf("umapfs_unmount(mp = %p)\n", mp); 259 #endif 260 261 if (mntflags & MNT_FORCE) 262 flags |= FORCECLOSE; 263 264 /* 265 * Clear out buffer cache. I don't think we 266 * ever get anything cached at this level at the 267 * moment, but who knows... 268 */ 269 #ifdef notyet 270 mntflushbuf(mp, 0); 271 if (mntinvalbuf(mp, 1)) 272 return (EBUSY); 273 #endif 274 if (rootvp->v_usecount > 1) 275 return (EBUSY); 276 if ((error = vflush(mp, rootvp, flags)) != 0) 277 return (error); 278 279 #ifdef UMAPFS_DIAGNOSTIC 280 vprint("alias root of lower", rootvp); 281 #endif 282 /* 283 * Release reference on underlying root vnode 284 */ 285 vrele(rootvp); 286 /* 287 * And blow it away for future re-use 288 */ 289 vgone(rootvp); 290 /* 291 * Finally, throw away the umap_mount structure 292 */ 293 free(mp->mnt_data, M_UFSMNT); /* XXX */ 294 mp->mnt_data = 0; 295 return (0); 296 } 297 298 extern const struct vnodeopv_desc umapfs_vnodeop_opv_desc; 299 300 const struct vnodeopv_desc * const umapfs_vnodeopv_descs[] = { 301 &umapfs_vnodeop_opv_desc, 302 NULL, 303 }; 304 305 struct vfsops umapfs_vfsops = { 306 MOUNT_UMAP, 307 umapfs_mount, 308 layerfs_start, 309 umapfs_unmount, 310 layerfs_root, 311 layerfs_quotactl, 312 layerfs_statfs, 313 layerfs_sync, 314 layerfs_vget, 315 layerfs_fhtovp, 316 layerfs_vptofh, 317 layerfs_init, 318 NULL, 319 layerfs_done, 320 layerfs_sysctl, 321 NULL, /* vfs_mountroot */ 322 layerfs_checkexp, 323 umapfs_vnodeopv_descs, 324 }; 325
Indexes created Tue Oct 07 21:09:53 GMT 2025