umap_vfsops.c revision 1.23.8.1
1 /* $NetBSD: umap_vfsops.c,v 1.23.8.1 1999/12/21 23:20:01 wrstuden 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/param.h> 48 #include <sys/systm.h> 49 #include <sys/proc.h> 50 #include <sys/time.h> 51 #include <sys/types.h> 52 #include <sys/vnode.h> 53 #include <sys/mount.h> 54 #include <sys/namei.h> 55 #include <sys/malloc.h> 56 #include <miscfs/umapfs/umap.h> 57 #include <miscfs/genfs/layer_extern.h> 58 59 int umapfs_mount __P((struct mount *, const char *, void *, 60 struct nameidata *, struct proc *)); 61 int umapfs_unmount __P((struct mount *, int, struct proc *)); 62 63 /* 64 * Mount umap layer 65 */ 66 int 67 umapfs_mount(mp, path, data, ndp, p) 68 struct mount *mp; 69 const char *path; 70 void *data; 71 struct nameidata *ndp; 72 struct proc *p; 73 { 74 struct umap_args args; 75 struct vnode *lowerrootvp, *vp; 76 struct umap_mount *amp; 77 size_t size; 78 int error; 79 #ifdef UMAPFS_DIAGNOSTIC 80 int i; 81 #endif 82 83 /* only for root */ 84 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 85 return error; 86 87 #ifdef UMAPFS_DIAGNOSTIC 88 printf("umapfs_mount(mp = %p)\n", mp); 89 #endif 90 91 /* 92 * Get argument 93 */ 94 error = copyin(data, (caddr_t)&args, sizeof(struct umap_args)); 95 if (error) 96 return (error); 97 98 /* 99 * Update only does export updating. 100 */ 101 if (mp->mnt_flag & MNT_UPDATE) { 102 amp = MOUNTTOUMAPMOUNT(mp); 103 if (args.umap_target == 0) 104 return (vfs_export(mp, &->umapm_export, 105 &args.umap_export)); 106 else 107 return (EOPNOTSUPP); 108 } 109 110 /* 111 * Find lower node 112 */ 113 NDINIT(ndp, LOOKUP, FOLLOW|WANTPARENT|LOCKLEAF, 114 UIO_USERSPACE, args.umap_target, p); 115 if ((error = namei(ndp)) != 0) 116 return (error); 117 118 /* 119 * Sanity check on lower vnode 120 */ 121 lowerrootvp = ndp->ni_vp; 122 #ifdef UMAPFS_DIAGNOSTIC 123 printf("vp = %p, check for VDIR...\n", lowerrootvp); 124 #endif 125 vrele(ndp->ni_dvp); 126 ndp->ni_dvp = 0; 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 mp->mnt_bshift = amp->umapm_vfs->mnt_bshift; 146 147 /* 148 * Now copy in the number of entries and maps for umap mapping. 149 */ 150 amp->info_nentries = args.nentries; 151 amp->info_gnentries = args.gnentries; 152 error = copyin(args.mapdata, (caddr_t)amp->info_mapdata, 153 2*sizeof(u_long)*args.nentries); 154 if (error) { 155 vput(lowerrootvp); 156 return (error); 157 } 158 159 #ifdef UMAPFS_DIAGNOSTIC 160 printf("umap_mount:nentries %d\n",args.nentries); 161 for (i = 0; i < args.nentries; i++) 162 printf(" %ld maps to %ld\n", amp->info_mapdata[i][0], 163 amp->info_mapdata[i][1]); 164 #endif 165 166 error = copyin(args.gmapdata, (caddr_t)amp->info_gmapdata, 167 2*sizeof(u_long)*args.gnentries); 168 if (error) { 169 vput(lowerrootvp); 170 return (error); 171 } 172 173 #ifdef UMAPFS_DIAGNOSTIC 174 printf("umap_mount:gnentries %d\n",args.gnentries); 175 for (i = 0; i < args.gnentries; i++) 176 printf("\tgroup %ld maps to %ld\n", 177 amp->info_gmapdata[i][0], 178 amp->info_gmapdata[i][1]); 179 #endif 180 181 /* 182 * Make sure the mount point's sufficiently initialized 183 * that the node create call will work. 184 */ 185 vfs_getnewfsid(mp, MOUNT_UMAP); 186 amp->umapm_size = sizeof(struct umap_node); 187 amp->umapm_tag = VT_UMAP; 188 amp->umapm_bypass = umap_bypass; 189 amp->umapm_alloc = layer_node_alloc; /* the default alloc is fine */ 190 amp->umapm_vnodeop_p = umap_vnodeop_p; 191 simple_lock_init(&->umapm_hashlock); 192 amp->umapm_node_hashtbl = hashinit(NUMAPNODECACHE, M_CACHE, M_WAITOK, 193 &->umapm_node_hash); 194 195 196 /* 197 * fix up umap node for root vnode. 198 */ 199 error = layer_node_create(mp, lowerrootvp, &vp); 200 /* 201 * Make sure the node alias worked 202 */ 203 if (error) { 204 vput(lowerrootvp); 205 free(amp, M_UFSMNT); /* XXX */ 206 return (error); 207 } 208 /* 209 * Unlock the node (either the lower or the alias) 210 */ 211 VOP_UNLOCK(vp, 0); 212 213 /* 214 * Keep a held reference to the root vnode. 215 * It is vrele'd in umapfs_unmount. 216 */ 217 vp->v_flag |= VROOT; 218 amp->umapm_rootvp = vp; 219 220 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 221 memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size); 222 (void) copyinstr(args.umap_target, mp->mnt_stat.f_mntfromname, 223 MNAMELEN - 1, &size); 224 memset(mp->mnt_stat.f_mntfromname + size, 0, MNAMELEN - size); 225 #ifdef UMAPFS_DIAGNOSTIC 226 printf("umapfs_mount: lower %s, alias at %s\n", 227 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname); 228 #endif 229 return (0); 230 } 231 232 /* 233 * Free reference to umap layer 234 */ 235 int 236 umapfs_unmount(mp, mntflags, p) 237 struct mount *mp; 238 int mntflags; 239 struct proc *p; 240 { 241 struct vnode *rootvp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp; 242 int error; 243 int flags = 0; 244 245 #ifdef UMAPFS_DIAGNOSTIC 246 printf("umapfs_unmount(mp = %p)\n", mp); 247 #endif 248 249 if (mntflags & MNT_FORCE) 250 flags |= FORCECLOSE; 251 252 /* 253 * Clear out buffer cache. I don't think we 254 * ever get anything cached at this level at the 255 * moment, but who knows... 256 */ 257 #ifdef notyet 258 mntflushbuf(mp, 0); 259 if (mntinvalbuf(mp, 1)) 260 return (EBUSY); 261 #endif 262 if (rootvp->v_usecount > 1) 263 return (EBUSY); 264 if ((error = vflush(mp, rootvp, flags)) != 0) 265 return (error); 266 267 #ifdef UMAPFS_DIAGNOSTIC 268 vprint("alias root of lower", rootvp); 269 #endif 270 /* 271 * Release reference on underlying root vnode 272 */ 273 vrele(rootvp); 274 /* 275 * And blow it away for future re-use 276 */ 277 vgone(rootvp); 278 /* 279 * Finally, throw away the umap_mount structure 280 */ 281 free(mp->mnt_data, M_UFSMNT); /* XXX */ 282 mp->mnt_data = 0; 283 return (0); 284 } 285 286 extern struct vnodeopv_desc umapfs_vnodeop_opv_desc; 287 288 struct vnodeopv_desc *umapfs_vnodeopv_descs[] = { 289 &umapfs_vnodeop_opv_desc, 290 NULL, 291 }; 292 293 struct vfsops umapfs_vfsops = { 294 MOUNT_UMAP, 295 umapfs_mount, 296 layerfs_start, 297 umapfs_unmount, 298 layerfs_root, 299 layerfs_quotactl, 300 layerfs_statfs, 301 layerfs_sync, 302 layerfs_vget, 303 layerfs_fhtovp, 304 layerfs_vptofh, 305 layerfs_init, 306 layerfs_sysctl, 307 NULL, /* vfs_mountroot */ 308 layerfs_checkexp, 309 umapfs_vnodeopv_descs, 310 }; 311
Indexes created Tue Oct 07 21:09:53 GMT 2025