umap_vfsops.c revision 1.48
1 /* $NetBSD: umap_vfsops.c,v 1.48 2004/05/29 23:48:08 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. 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 1.48 2004/05/29 23:48:08 wrstuden Exp $"); 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/sysctl.h> 49 #include <sys/proc.h> 50 #include <sys/time.h> 51 #include <sys/vnode.h> 52 #include <sys/mount.h> 53 #include <sys/namei.h> 54 #include <sys/malloc.h> 55 #include <miscfs/umapfs/umap.h> 56 #include <miscfs/genfs/layer_extern.h> 57 58 int umapfs_mount __P((struct mount *, const char *, void *, 59 struct nameidata *, struct proc *)); 60 int umapfs_unmount __P((struct mount *, int, struct proc *)); 61 62 /* 63 * Mount umap layer 64 */ 65 int 66 umapfs_mount(mp, path, data, ndp, p) 67 struct mount *mp; 68 const char *path; 69 void *data; 70 struct nameidata *ndp; 71 struct proc *p; 72 { 73 struct umap_args args; 74 struct vnode *lowerrootvp, *vp; 75 struct umap_mount *amp; 76 int error; 77 #ifdef UMAPFS_DIAGNOSTIC 78 int i; 79 #endif 80 if (mp->mnt_flag & MNT_GETARGS) { 81 amp = MOUNTTOUMAPMOUNT(mp); 82 if (amp == NULL) 83 return EIO; 84 args.la.target = NULL; 85 vfs_showexport(mp, &args.la.export, &->umapm_export); 86 args.nentries = amp->info_nentries; 87 args.gnentries = amp->info_gnentries; 88 return copyout(&args, data, sizeof(args)); 89 } 90 91 /* only for root */ 92 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 93 return error; 94 95 #ifdef UMAPFS_DIAGNOSTIC 96 printf("umapfs_mount(mp = %p)\n", mp); 97 #endif 98 99 /* 100 * Get argument 101 */ 102 error = copyin(data, &args, sizeof(struct umap_args)); 103 if (error) 104 return (error); 105 106 /* 107 * Update only does export updating. 108 */ 109 if (mp->mnt_flag & MNT_UPDATE) { 110 amp = MOUNTTOUMAPMOUNT(mp); 111 if (args.umap_target == 0) 112 return (vfs_export(mp, &->umapm_export, 113 &args.umap_export)); 114 else 115 return (EOPNOTSUPP); 116 } 117 118 /* 119 * Find lower node 120 */ 121 NDINIT(ndp, LOOKUP, FOLLOW|LOCKLEAF, 122 UIO_USERSPACE, args.umap_target, p); 123 if ((error = namei(ndp)) != 0) 124 return (error); 125 126 /* 127 * Sanity check on lower vnode 128 */ 129 lowerrootvp = ndp->ni_vp; 130 #ifdef UMAPFS_DIAGNOSTIC 131 printf("vp = %p, check for VDIR...\n", lowerrootvp); 132 #endif 133 134 if (lowerrootvp->v_type != VDIR) { 135 vput(lowerrootvp); 136 return (EINVAL); 137 } 138 139 #ifdef UMAPFS_DIAGNOSTIC 140 printf("mp = %p\n", mp); 141 #endif 142 143 amp = (struct umap_mount *) malloc(sizeof(struct umap_mount), 144 M_UFSMNT, M_WAITOK); /* XXX */ 145 memset(amp, 0, sizeof(struct umap_mount)); 146 147 mp->mnt_data = amp; 148 amp->umapm_vfs = lowerrootvp->v_mount; 149 if (amp->umapm_vfs->mnt_flag & MNT_LOCAL) 150 mp->mnt_flag |= MNT_LOCAL; 151 152 /* 153 * Now copy in the number of entries and maps for umap mapping. 154 */ 155 if (args.nentries > MAPFILEENTRIES || args.gnentries > GMAPFILEENTRIES) { 156 vput(lowerrootvp); 157 return (error); 158 } 159 160 amp->info_nentries = args.nentries; 161 amp->info_gnentries = args.gnentries; 162 error = copyin(args.mapdata, amp->info_mapdata, 163 2*sizeof(u_long)*args.nentries); 164 if (error) { 165 vput(lowerrootvp); 166 return (error); 167 } 168 169 #ifdef UMAPFS_DIAGNOSTIC 170 printf("umap_mount:nentries %d\n",args.nentries); 171 for (i = 0; i < args.nentries; i++) 172 printf(" %ld maps to %ld\n", amp->info_mapdata[i][0], 173 amp->info_mapdata[i][1]); 174 #endif 175 176 error = copyin(args.gmapdata, amp->info_gmapdata, 177 2*sizeof(u_long)*args.gnentries); 178 if (error) { 179 vput(lowerrootvp); 180 return (error); 181 } 182 183 #ifdef UMAPFS_DIAGNOSTIC 184 printf("umap_mount:gnentries %d\n",args.gnentries); 185 for (i = 0; i < args.gnentries; i++) 186 printf("\tgroup %ld maps to %ld\n", 187 amp->info_gmapdata[i][0], 188 amp->info_gmapdata[i][1]); 189 #endif 190 191 /* 192 * Make sure the mount point's sufficiently initialized 193 * that the node create call will work. 194 */ 195 vfs_getnewfsid(mp); 196 amp->umapm_size = sizeof(struct umap_node); 197 amp->umapm_tag = VT_UMAP; 198 amp->umapm_bypass = umap_bypass; 199 amp->umapm_alloc = layer_node_alloc; /* the default alloc is fine */ 200 amp->umapm_vnodeop_p = umap_vnodeop_p; 201 simple_lock_init(&->umapm_hashlock); 202 amp->umapm_node_hashtbl = hashinit(NUMAPNODECACHE, HASH_LIST, M_CACHE, 203 M_WAITOK, &->umapm_node_hash); 204 205 206 /* 207 * fix up umap node for root vnode. 208 */ 209 error = layer_node_create(mp, lowerrootvp, &vp); 210 /* 211 * Make sure the node alias worked 212 */ 213 if (error) { 214 vput(lowerrootvp); 215 free(amp, M_UFSMNT); /* XXX */ 216 return (error); 217 } 218 /* 219 * Unlock the node (either the lower or the alias) 220 */ 221 VOP_UNLOCK(vp, 0); 222 223 /* 224 * Keep a held reference to the root vnode. 225 * It is vrele'd in umapfs_unmount. 226 */ 227 vp->v_flag |= VROOT; 228 amp->umapm_rootvp = vp; 229 230 error = set_statvfs_info(path, UIO_USERSPACE, args.umap_target, 231 UIO_USERSPACE, mp, p); 232 #ifdef UMAPFS_DIAGNOSTIC 233 printf("umapfs_mount: lower %s, alias at %s\n", 234 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname); 235 #endif 236 return error; 237 } 238 239 /* 240 * Free reference to umap layer 241 */ 242 int 243 umapfs_unmount(mp, mntflags, p) 244 struct mount *mp; 245 int mntflags; 246 struct proc *p; 247 { 248 struct vnode *rootvp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp; 249 int error; 250 int flags = 0; 251 252 #ifdef UMAPFS_DIAGNOSTIC 253 printf("umapfs_unmount(mp = %p)\n", mp); 254 #endif 255 256 if (mntflags & MNT_FORCE) 257 flags |= FORCECLOSE; 258 259 /* 260 * Clear out buffer cache. I don't think we 261 * ever get anything cached at this level at the 262 * moment, but who knows... 263 */ 264 #ifdef notyet 265 mntflushbuf(mp, 0); 266 if (mntinvalbuf(mp, 1)) 267 return (EBUSY); 268 #endif 269 if (rootvp->v_usecount > 1) 270 return (EBUSY); 271 if ((error = vflush(mp, rootvp, flags)) != 0) 272 return (error); 273 274 #ifdef UMAPFS_DIAGNOSTIC 275 vprint("alias root of lower", rootvp); 276 #endif 277 /* 278 * Release reference on underlying root vnode 279 */ 280 vrele(rootvp); 281 /* 282 * And blow it away for future re-use 283 */ 284 vgone(rootvp); 285 /* 286 * Finally, throw away the umap_mount structure 287 */ 288 free(mp->mnt_data, M_UFSMNT); /* XXX */ 289 mp->mnt_data = 0; 290 return (0); 291 } 292 293 SYSCTL_SETUP(sysctl_vfs_umap_setup, "sysctl vfs.umap subtree setup") 294 { 295 296 sysctl_createv(clog, 0, NULL, NULL, 297 CTLFLAG_PERMANENT, 298 CTLTYPE_NODE, "vfs", NULL, 299 NULL, 0, NULL, 0, 300 CTL_VFS, CTL_EOL); 301 sysctl_createv(clog, 0, NULL, NULL, 302 CTLFLAG_PERMANENT, 303 CTLTYPE_NODE, "umap", 304 SYSCTL_DESCR("UID/GID remapping file system"), 305 NULL, 0, NULL, 0, 306 CTL_VFS, 10, CTL_EOL); 307 /* 308 * XXX the "10" above could be dynamic, thereby eliminating 309 * one more instance of the "number to vfs" mapping problem, 310 * but "10" is the order as taken from sys/mount.h 311 */ 312 } 313 314 extern const struct vnodeopv_desc umapfs_vnodeop_opv_desc; 315 316 const struct vnodeopv_desc * const umapfs_vnodeopv_descs[] = { 317 &umapfs_vnodeop_opv_desc, 318 NULL, 319 }; 320 321 struct vfsops umapfs_vfsops = { 322 MOUNT_UMAP, 323 umapfs_mount, 324 layerfs_start, 325 umapfs_unmount, 326 layerfs_root, 327 layerfs_quotactl, 328 layerfs_statvfs, 329 layerfs_sync, 330 layerfs_vget, 331 layerfs_fhtovp, 332 layerfs_vptofh, 333 layerfs_init, 334 NULL, 335 layerfs_done, 336 NULL, 337 NULL, /* vfs_mountroot */ 338 layerfs_checkexp, 339 layerfs_snapshot, 340 umapfs_vnodeopv_descs, 341 }; 342
Indexes created Sun Sep 21 20:09:37 GMT 2025