umap_vfsops.c revision 1.28
1 /* $NetBSD: umap_vfsops.c,v 1.28 2001/08/02 22:40:59 assar 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|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 125 126 if (lowerrootvp->v_type != VDIR) { 127 vput(lowerrootvp); 128 return (EINVAL); 129 } 130 131 #ifdef UMAPFS_DIAGNOSTIC 132 printf("mp = %p\n", mp); 133 #endif 134 135 amp = (struct umap_mount *) malloc(sizeof(struct umap_mount), 136 M_UFSMNT, M_WAITOK); /* XXX */ 137 memset((caddr_t)amp, 0, sizeof(struct umap_mount)); 138 139 mp->mnt_data = (qaddr_t) amp; 140 amp->umapm_vfs = lowerrootvp->v_mount; 141 if (amp->umapm_vfs->mnt_flag & MNT_LOCAL) 142 mp->mnt_flag |= MNT_LOCAL; 143 144 /* 145 * Now copy in the number of entries and maps for umap mapping. 146 */ 147 amp->info_nentries = args.nentries; 148 amp->info_gnentries = args.gnentries; 149 error = copyin(args.mapdata, (caddr_t)amp->info_mapdata, 150 2*sizeof(u_long)*args.nentries); 151 if (error) { 152 vput(lowerrootvp); 153 return (error); 154 } 155 156 #ifdef UMAPFS_DIAGNOSTIC 157 printf("umap_mount:nentries %d\n",args.nentries); 158 for (i = 0; i < args.nentries; i++) 159 printf(" %ld maps to %ld\n", amp->info_mapdata[i][0], 160 amp->info_mapdata[i][1]); 161 #endif 162 163 error = copyin(args.gmapdata, (caddr_t)amp->info_gmapdata, 164 2*sizeof(u_long)*args.gnentries); 165 if (error) { 166 vput(lowerrootvp); 167 return (error); 168 } 169 170 #ifdef UMAPFS_DIAGNOSTIC 171 printf("umap_mount:gnentries %d\n",args.gnentries); 172 for (i = 0; i < args.gnentries; i++) 173 printf("\tgroup %ld maps to %ld\n", 174 amp->info_gmapdata[i][0], 175 amp->info_gmapdata[i][1]); 176 #endif 177 178 /* 179 * Make sure the mount point's sufficiently initialized 180 * that the node create call will work. 181 */ 182 vfs_getnewfsid(mp); 183 amp->umapm_size = sizeof(struct umap_node); 184 amp->umapm_tag = VT_UMAP; 185 amp->umapm_bypass = umap_bypass; 186 amp->umapm_alloc = layer_node_alloc; /* the default alloc is fine */ 187 amp->umapm_vnodeop_p = umap_vnodeop_p; 188 simple_lock_init(&->umapm_hashlock); 189 amp->umapm_node_hashtbl = hashinit(NUMAPNODECACHE, HASH_LIST, M_CACHE, 190 M_WAITOK, &->umapm_node_hash); 191 192 193 /* 194 * fix up umap node for root vnode. 195 */ 196 error = layer_node_create(mp, lowerrootvp, &vp); 197 /* 198 * Make sure the node alias worked 199 */ 200 if (error) { 201 vput(lowerrootvp); 202 free(amp, M_UFSMNT); /* XXX */ 203 return (error); 204 } 205 /* 206 * Unlock the node (either the lower or the alias) 207 */ 208 VOP_UNLOCK(vp, 0); 209 210 /* 211 * Keep a held reference to the root vnode. 212 * It is vrele'd in umapfs_unmount. 213 */ 214 vp->v_flag |= VROOT; 215 amp->umapm_rootvp = vp; 216 217 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 218 memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size); 219 (void) copyinstr(args.umap_target, mp->mnt_stat.f_mntfromname, 220 MNAMELEN - 1, &size); 221 memset(mp->mnt_stat.f_mntfromname + size, 0, MNAMELEN - size); 222 #ifdef UMAPFS_DIAGNOSTIC 223 printf("umapfs_mount: lower %s, alias at %s\n", 224 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname); 225 #endif 226 return (0); 227 } 228 229 /* 230 * Free reference to umap layer 231 */ 232 int 233 umapfs_unmount(mp, mntflags, p) 234 struct mount *mp; 235 int mntflags; 236 struct proc *p; 237 { 238 struct vnode *rootvp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp; 239 int error; 240 int flags = 0; 241 242 #ifdef UMAPFS_DIAGNOSTIC 243 printf("umapfs_unmount(mp = %p)\n", mp); 244 #endif 245 246 if (mntflags & MNT_FORCE) 247 flags |= FORCECLOSE; 248 249 /* 250 * Clear out buffer cache. I don't think we 251 * ever get anything cached at this level at the 252 * moment, but who knows... 253 */ 254 #ifdef notyet 255 mntflushbuf(mp, 0); 256 if (mntinvalbuf(mp, 1)) 257 return (EBUSY); 258 #endif 259 if (rootvp->v_usecount > 1) 260 return (EBUSY); 261 if ((error = vflush(mp, rootvp, flags)) != 0) 262 return (error); 263 264 #ifdef UMAPFS_DIAGNOSTIC 265 vprint("alias root of lower", rootvp); 266 #endif 267 /* 268 * Release reference on underlying root vnode 269 */ 270 vrele(rootvp); 271 /* 272 * And blow it away for future re-use 273 */ 274 vgone(rootvp); 275 /* 276 * Finally, throw away the umap_mount structure 277 */ 278 free(mp->mnt_data, M_UFSMNT); /* XXX */ 279 mp->mnt_data = 0; 280 return (0); 281 } 282 283 extern const struct vnodeopv_desc umapfs_vnodeop_opv_desc; 284 285 const struct vnodeopv_desc * const umapfs_vnodeopv_descs[] = { 286 &umapfs_vnodeop_opv_desc, 287 NULL, 288 }; 289 290 struct vfsops umapfs_vfsops = { 291 MOUNT_UMAP, 292 umapfs_mount, 293 layerfs_start, 294 umapfs_unmount, 295 layerfs_root, 296 layerfs_quotactl, 297 layerfs_statfs, 298 layerfs_sync, 299 layerfs_vget, 300 layerfs_fhtovp, 301 layerfs_vptofh, 302 layerfs_init, 303 layerfs_done, 304 layerfs_sysctl, 305 NULL, /* vfs_mountroot */ 306 layerfs_checkexp, 307 umapfs_vnodeopv_descs, 308 }; 309
Indexes created Thu Sep 25 02:09:54 GMT 2025