umap_vfsops.c revision 1.66
1 /* $NetBSD: umap_vfsops.c,v 1.66 2007/07/12 19:35:35 dsl 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 1.66 2007/07/12 19:35:35 dsl 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 <sys/kauth.h> 56 57 #include <miscfs/umapfs/umap.h> 58 #include <miscfs/genfs/layer_extern.h> 59 60 int umapfs_mount(struct mount *, const char *, void *, size_t *, 61 struct nameidata *, struct lwp *); 62 int umapfs_unmount(struct mount *, int, struct lwp *); 63 64 /* 65 * Mount umap layer 66 */ 67 int 68 umapfs_mount(mp, path, data, data_len, ndp, l) 69 struct mount *mp; 70 const char *path; 71 void *data; 72 size_t *data_len; 73 struct nameidata *ndp; 74 struct lwp *l; 75 { 76 struct umap_args *args = data; 77 struct vnode *lowerrootvp, *vp; 78 struct umap_mount *amp; 79 int error; 80 #ifdef UMAPFS_DIAGNOSTIC 81 int i; 82 #endif 83 84 if (*data_len < sizeof *args) 85 return EINVAL; 86 87 if (mp->mnt_flag & MNT_GETARGS) { 88 amp = MOUNTTOUMAPMOUNT(mp); 89 if (amp == NULL) 90 return EIO; 91 args->la.target = NULL; 92 args->nentries = amp->info_nentries; 93 args->gnentries = amp->info_gnentries; 94 *data_len = sizeof *args; 95 return 0; 96 } 97 98 /* only for root */ 99 if ((error = kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, 100 NULL)) != 0) 101 return error; 102 103 #ifdef UMAPFS_DIAGNOSTIC 104 printf("umapfs_mount(mp = %p)\n", mp); 105 #endif 106 107 /* 108 * Update is not supported 109 */ 110 if (mp->mnt_flag & MNT_UPDATE) 111 return EOPNOTSUPP; 112 113 /* 114 * Find lower node 115 */ 116 NDINIT(ndp, LOOKUP, FOLLOW|LOCKLEAF, 117 UIO_USERSPACE, args->umap_target, l); 118 if ((error = namei(ndp)) != 0) 119 return (error); 120 121 /* 122 * Sanity check on lower vnode 123 */ 124 lowerrootvp = ndp->ni_vp; 125 #ifdef UMAPFS_DIAGNOSTIC 126 printf("vp = %p, check for VDIR...\n", lowerrootvp); 127 #endif 128 129 if (lowerrootvp->v_type != VDIR) { 130 vput(lowerrootvp); 131 return (EINVAL); 132 } 133 134 #ifdef UMAPFS_DIAGNOSTIC 135 printf("mp = %p\n", mp); 136 #endif 137 138 amp = (struct umap_mount *) malloc(sizeof(struct umap_mount), 139 M_UFSMNT, M_WAITOK); /* XXX */ 140 memset(amp, 0, sizeof(struct umap_mount)); 141 142 mp->mnt_data = amp; 143 amp->umapm_vfs = lowerrootvp->v_mount; 144 if (amp->umapm_vfs->mnt_flag & MNT_LOCAL) 145 mp->mnt_flag |= MNT_LOCAL; 146 147 /* 148 * Now copy in the number of entries and maps for umap mapping. 149 */ 150 if (args->nentries > MAPFILEENTRIES || args->gnentries > GMAPFILEENTRIES) { 151 vput(lowerrootvp); 152 return (error); 153 } 154 155 amp->info_nentries = args->nentries; 156 amp->info_gnentries = args->gnentries; 157 error = copyin(args->mapdata, amp->info_mapdata, 158 2*sizeof(u_long)*args->nentries); 159 if (error) { 160 vput(lowerrootvp); 161 return (error); 162 } 163 164 #ifdef UMAPFS_DIAGNOSTIC 165 printf("umap_mount:nentries %d\n",args->nentries); 166 for (i = 0; i < args->nentries; i++) 167 printf(" %ld maps to %ld\n", amp->info_mapdata[i][0], 168 amp->info_mapdata[i][1]); 169 #endif 170 171 error = copyin(args->gmapdata, amp->info_gmapdata, 172 2*sizeof(u_long)*args->gnentries); 173 if (error) { 174 vput(lowerrootvp); 175 return (error); 176 } 177 178 #ifdef UMAPFS_DIAGNOSTIC 179 printf("umap_mount:gnentries %d\n",args->gnentries); 180 for (i = 0; i < args->gnentries; i++) 181 printf("\tgroup %ld maps to %ld\n", 182 amp->info_gmapdata[i][0], 183 amp->info_gmapdata[i][1]); 184 #endif 185 186 /* 187 * Make sure the mount point's sufficiently initialized 188 * that the node create call will work. 189 */ 190 vfs_getnewfsid(mp); 191 amp->umapm_size = sizeof(struct umap_node); 192 amp->umapm_tag = VT_UMAP; 193 amp->umapm_bypass = umap_bypass; 194 amp->umapm_alloc = layer_node_alloc; /* the default alloc is fine */ 195 amp->umapm_vnodeop_p = umap_vnodeop_p; 196 simple_lock_init(&->umapm_hashlock); 197 amp->umapm_node_hashtbl = hashinit(NUMAPNODECACHE, HASH_LIST, M_CACHE, 198 M_WAITOK, &->umapm_node_hash); 199 200 201 /* 202 * fix up umap node for root vnode. 203 */ 204 error = layer_node_create(mp, lowerrootvp, &vp); 205 /* 206 * Make sure the node alias worked 207 */ 208 if (error) { 209 vput(lowerrootvp); 210 free(amp, M_UFSMNT); /* XXX */ 211 return (error); 212 } 213 /* 214 * Unlock the node (either the lower or the alias) 215 */ 216 VOP_UNLOCK(vp, 0); 217 218 /* 219 * Keep a held reference to the root vnode. 220 * It is vrele'd in umapfs_unmount. 221 */ 222 vp->v_flag |= VROOT; 223 amp->umapm_rootvp = vp; 224 225 error = set_statvfs_info(path, UIO_USERSPACE, args->umap_target, 226 UIO_USERSPACE, mp, l); 227 #ifdef UMAPFS_DIAGNOSTIC 228 printf("umapfs_mount: lower %s, alias at %s\n", 229 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname); 230 #endif 231 return error; 232 } 233 234 /* 235 * Free reference to umap layer 236 */ 237 int 238 umapfs_unmount(struct mount *mp, int mntflags, struct lwp *l) 239 { 240 struct vnode *rtvp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp; 241 int error; 242 int flags = 0; 243 244 #ifdef UMAPFS_DIAGNOSTIC 245 printf("umapfs_unmount(mp = %p)\n", mp); 246 #endif 247 248 if (mntflags & MNT_FORCE) 249 flags |= FORCECLOSE; 250 251 if (rtvp->v_usecount > 1 && (mntflags & MNT_FORCE) == 0) 252 return (EBUSY); 253 if ((error = vflush(mp, rtvp, flags)) != 0) 254 return (error); 255 256 #ifdef UMAPFS_DIAGNOSTIC 257 vprint("alias root of lower", rtvp); 258 #endif 259 /* 260 * Release reference on underlying root vnode 261 */ 262 vrele(rtvp); 263 /* 264 * And blow it away for future re-use 265 */ 266 vgone(rtvp); 267 /* 268 * Finally, throw away the umap_mount structure 269 */ 270 free(mp->mnt_data, M_UFSMNT); /* XXX */ 271 mp->mnt_data = 0; 272 return (0); 273 } 274 275 SYSCTL_SETUP(sysctl_vfs_umap_setup, "sysctl vfs.umap subtree setup") 276 { 277 278 sysctl_createv(clog, 0, NULL, NULL, 279 CTLFLAG_PERMANENT, 280 CTLTYPE_NODE, "vfs", NULL, 281 NULL, 0, NULL, 0, 282 CTL_VFS, CTL_EOL); 283 sysctl_createv(clog, 0, NULL, NULL, 284 CTLFLAG_PERMANENT, 285 CTLTYPE_NODE, "umap", 286 SYSCTL_DESCR("UID/GID remapping file system"), 287 NULL, 0, NULL, 0, 288 CTL_VFS, 10, CTL_EOL); 289 /* 290 * XXX the "10" above could be dynamic, thereby eliminating 291 * one more instance of the "number to vfs" mapping problem, 292 * but "10" is the order as taken from sys/mount.h 293 */ 294 } 295 296 extern const struct vnodeopv_desc umapfs_vnodeop_opv_desc; 297 298 const struct vnodeopv_desc * const umapfs_vnodeopv_descs[] = { 299 &umapfs_vnodeop_opv_desc, 300 NULL, 301 }; 302 303 struct vfsops umapfs_vfsops = { 304 MOUNT_UMAP, 305 sizeof (struct umap_args), 306 umapfs_mount, 307 layerfs_start, 308 umapfs_unmount, 309 layerfs_root, 310 layerfs_quotactl, 311 layerfs_statvfs, 312 layerfs_sync, 313 layerfs_vget, 314 layerfs_fhtovp, 315 layerfs_vptofh, 316 layerfs_init, 317 NULL, 318 layerfs_done, 319 NULL, /* vfs_mountroot */ 320 layerfs_snapshot, 321 vfs_stdextattrctl, 322 vfs_stdsuspendctl, 323 umapfs_vnodeopv_descs, 324 0, /* vfs_refcount */ 325 { NULL, NULL }, 326 }; 327 VFS_ATTACH(umapfs_vfsops); 328
Indexes created Mon Sep 22 21:09:42 GMT 2025