umap_vfsops.c revision 1.40
1 /* $NetBSD: umap_vfsops.c,v 1.40 2003/08/07 16:32:46 agc 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from: @(#)null_vfsops.c 1.5 (Berkeley) 7/10/92 35 * @(#)umap_vfsops.c 8.8 (Berkeley) 5/14/95 36 */ 37 38 /* 39 * Umap Layer 40 * (See mount_umap(8) for a description of this layer.) 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: umap_vfsops.c,v 1.40 2003/08/07 16:32:46 agc Exp $"); 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/proc.h> 49 #include <sys/time.h> 50 #include <sys/vnode.h> 51 #include <sys/mount.h> 52 #include <sys/namei.h> 53 #include <sys/malloc.h> 54 #include <miscfs/umapfs/umap.h> 55 #include <miscfs/genfs/layer_extern.h> 56 57 int umapfs_mount __P((struct mount *, const char *, void *, 58 struct nameidata *, struct proc *)); 59 int umapfs_unmount __P((struct mount *, int, struct proc *)); 60 61 /* 62 * Mount umap layer 63 */ 64 int 65 umapfs_mount(mp, path, data, ndp, p) 66 struct mount *mp; 67 const char *path; 68 void *data; 69 struct nameidata *ndp; 70 struct proc *p; 71 { 72 struct umap_args args; 73 struct vnode *lowerrootvp, *vp; 74 struct umap_mount *amp; 75 int error; 76 #ifdef UMAPFS_DIAGNOSTIC 77 int i; 78 #endif 79 if (mp->mnt_flag & MNT_GETARGS) { 80 amp = MOUNTTOUMAPMOUNT(mp); 81 if (amp == NULL) 82 return EIO; 83 args.la.target = NULL; 84 vfs_showexport(mp, &args.la.export, &->umapm_export); 85 args.nentries = amp->info_nentries; 86 args.gnentries = amp->info_gnentries; 87 return copyout(&args, data, sizeof(args)); 88 } 89 90 /* only for root */ 91 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 92 return error; 93 94 #ifdef UMAPFS_DIAGNOSTIC 95 printf("umapfs_mount(mp = %p)\n", mp); 96 #endif 97 98 /* 99 * Get argument 100 */ 101 error = copyin(data, (caddr_t)&args, sizeof(struct umap_args)); 102 if (error) 103 return (error); 104 105 /* 106 * Update only does export updating. 107 */ 108 if (mp->mnt_flag & MNT_UPDATE) { 109 amp = MOUNTTOUMAPMOUNT(mp); 110 if (args.umap_target == 0) 111 return (vfs_export(mp, &->umapm_export, 112 &args.umap_export)); 113 else 114 return (EOPNOTSUPP); 115 } 116 117 /* 118 * Find lower node 119 */ 120 NDINIT(ndp, LOOKUP, FOLLOW|LOCKLEAF, 121 UIO_USERSPACE, args.umap_target, p); 122 if ((error = namei(ndp)) != 0) 123 return (error); 124 125 /* 126 * Sanity check on lower vnode 127 */ 128 lowerrootvp = ndp->ni_vp; 129 #ifdef UMAPFS_DIAGNOSTIC 130 printf("vp = %p, check for VDIR...\n", lowerrootvp); 131 #endif 132 133 if (lowerrootvp->v_type != VDIR) { 134 vput(lowerrootvp); 135 return (EINVAL); 136 } 137 138 #ifdef UMAPFS_DIAGNOSTIC 139 printf("mp = %p\n", mp); 140 #endif 141 142 amp = (struct umap_mount *) malloc(sizeof(struct umap_mount), 143 M_UFSMNT, M_WAITOK); /* XXX */ 144 memset((caddr_t)amp, 0, sizeof(struct umap_mount)); 145 146 mp->mnt_data = amp; 147 amp->umapm_vfs = lowerrootvp->v_mount; 148 if (amp->umapm_vfs->mnt_flag & MNT_LOCAL) 149 mp->mnt_flag |= MNT_LOCAL; 150 151 /* 152 * Now copy in the number of entries and maps for umap mapping. 153 */ 154 if (args.nentries > MAPFILEENTRIES || args.gnentries > GMAPFILEENTRIES) { 155 vput(lowerrootvp); 156 return (error); 157 } 158 159 amp->info_nentries = args.nentries; 160 amp->info_gnentries = args.gnentries; 161 error = copyin(args.mapdata, (caddr_t)amp->info_mapdata, 162 2*sizeof(u_long)*args.nentries); 163 if (error) { 164 vput(lowerrootvp); 165 return (error); 166 } 167 168 #ifdef UMAPFS_DIAGNOSTIC 169 printf("umap_mount:nentries %d\n",args.nentries); 170 for (i = 0; i < args.nentries; i++) 171 printf(" %ld maps to %ld\n", amp->info_mapdata[i][0], 172 amp->info_mapdata[i][1]); 173 #endif 174 175 error = copyin(args.gmapdata, (caddr_t)amp->info_gmapdata, 176 2*sizeof(u_long)*args.gnentries); 177 if (error) { 178 vput(lowerrootvp); 179 return (error); 180 } 181 182 #ifdef UMAPFS_DIAGNOSTIC 183 printf("umap_mount:gnentries %d\n",args.gnentries); 184 for (i = 0; i < args.gnentries; i++) 185 printf("\tgroup %ld maps to %ld\n", 186 amp->info_gmapdata[i][0], 187 amp->info_gmapdata[i][1]); 188 #endif 189 190 /* 191 * Make sure the mount point's sufficiently initialized 192 * that the node create call will work. 193 */ 194 vfs_getnewfsid(mp); 195 amp->umapm_size = sizeof(struct umap_node); 196 amp->umapm_tag = VT_UMAP; 197 amp->umapm_bypass = umap_bypass; 198 amp->umapm_alloc = layer_node_alloc; /* the default alloc is fine */ 199 amp->umapm_vnodeop_p = umap_vnodeop_p; 200 simple_lock_init(&->umapm_hashlock); 201 amp->umapm_node_hashtbl = hashinit(NUMAPNODECACHE, HASH_LIST, M_CACHE, 202 M_WAITOK, &->umapm_node_hash); 203 204 205 /* 206 * fix up umap node for root vnode. 207 */ 208 error = layer_node_create(mp, lowerrootvp, &vp); 209 /* 210 * Make sure the node alias worked 211 */ 212 if (error) { 213 vput(lowerrootvp); 214 free(amp, M_UFSMNT); /* XXX */ 215 return (error); 216 } 217 /* 218 * Unlock the node (either the lower or the alias) 219 */ 220 VOP_UNLOCK(vp, 0); 221 222 /* 223 * Keep a held reference to the root vnode. 224 * It is vrele'd in umapfs_unmount. 225 */ 226 vp->v_flag |= VROOT; 227 amp->umapm_rootvp = vp; 228 229 error = set_statfs_info(path, UIO_USERSPACE, args.umap_target, 230 UIO_USERSPACE, mp, p); 231 #ifdef UMAPFS_DIAGNOSTIC 232 printf("umapfs_mount: lower %s, alias at %s\n", 233 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname); 234 #endif 235 return error; 236 } 237 238 /* 239 * Free reference to umap layer 240 */ 241 int 242 umapfs_unmount(mp, mntflags, p) 243 struct mount *mp; 244 int mntflags; 245 struct proc *p; 246 { 247 struct vnode *rootvp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp; 248 int error; 249 int flags = 0; 250 251 #ifdef UMAPFS_DIAGNOSTIC 252 printf("umapfs_unmount(mp = %p)\n", mp); 253 #endif 254 255 if (mntflags & MNT_FORCE) 256 flags |= FORCECLOSE; 257 258 /* 259 * Clear out buffer cache. I don't think we 260 * ever get anything cached at this level at the 261 * moment, but who knows... 262 */ 263 #ifdef notyet 264 mntflushbuf(mp, 0); 265 if (mntinvalbuf(mp, 1)) 266 return (EBUSY); 267 #endif 268 if (rootvp->v_usecount > 1) 269 return (EBUSY); 270 if ((error = vflush(mp, rootvp, flags)) != 0) 271 return (error); 272 273 #ifdef UMAPFS_DIAGNOSTIC 274 vprint("alias root of lower", rootvp); 275 #endif 276 /* 277 * Release reference on underlying root vnode 278 */ 279 vrele(rootvp); 280 /* 281 * And blow it away for future re-use 282 */ 283 vgone(rootvp); 284 /* 285 * Finally, throw away the umap_mount structure 286 */ 287 free(mp->mnt_data, M_UFSMNT); /* XXX */ 288 mp->mnt_data = 0; 289 return (0); 290 } 291 292 extern const struct vnodeopv_desc umapfs_vnodeop_opv_desc; 293 294 const struct vnodeopv_desc * const umapfs_vnodeopv_descs[] = { 295 &umapfs_vnodeop_opv_desc, 296 NULL, 297 }; 298 299 struct vfsops umapfs_vfsops = { 300 MOUNT_UMAP, 301 umapfs_mount, 302 layerfs_start, 303 umapfs_unmount, 304 layerfs_root, 305 layerfs_quotactl, 306 layerfs_statfs, 307 layerfs_sync, 308 layerfs_vget, 309 layerfs_fhtovp, 310 layerfs_vptofh, 311 layerfs_init, 312 NULL, 313 layerfs_done, 314 layerfs_sysctl, 315 NULL, /* vfs_mountroot */ 316 layerfs_checkexp, 317 umapfs_vnodeopv_descs, 318 }; 319
Indexes created Mon Sep 22 10:09:38 GMT 2025