umap_vfsops.c revision 1.56.10.2
1 /* $NetBSD: umap_vfsops.c,v 1.56.10.2 2006/03/10 13:57:49 elad 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 1.56.10.2 2006/03/10 13:57:49 elad 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(struct mount *, const char *, void *, 59 struct nameidata *, struct lwp *); 60 int umapfs_unmount(struct mount *, int, struct lwp *); 61 62 /* 63 * Mount umap layer 64 */ 65 int 66 umapfs_mount(mp, path, data, ndp, l) 67 struct mount *mp; 68 const char *path; 69 void *data; 70 struct nameidata *ndp; 71 struct lwp *l; 72 { 73 struct umap_args args; 74 struct vnode *lowerrootvp, *vp; 75 struct umap_mount *amp; 76 struct proc *p = l->l_proc; 77 int error; 78 #ifdef UMAPFS_DIAGNOSTIC 79 int i; 80 #endif 81 82 if (mp->mnt_flag & MNT_GETARGS) { 83 amp = MOUNTTOUMAPMOUNT(mp); 84 if (amp == NULL) 85 return EIO; 86 args.la.target = NULL; 87 args.nentries = amp->info_nentries; 88 args.gnentries = amp->info_gnentries; 89 return copyout(&args, data, sizeof(args)); 90 } 91 92 /* only for root */ 93 if ((error = kauth_authorize_generic(p->p_cred, KAUTH_GENERIC_ISSUSER, 94 &p->p_acflag)) != 0) 95 return error; 96 97 #ifdef UMAPFS_DIAGNOSTIC 98 printf("umapfs_mount(mp = %p)\n", mp); 99 #endif 100 101 /* 102 * Get argument 103 */ 104 error = copyin(data, &args, sizeof(struct umap_args)); 105 if (error) 106 return (error); 107 108 /* 109 * Update is not supported 110 */ 111 if (mp->mnt_flag & MNT_UPDATE) 112 return EOPNOTSUPP; 113 114 /* 115 * Find lower node 116 */ 117 NDINIT(ndp, LOOKUP, FOLLOW|LOCKLEAF, 118 UIO_USERSPACE, args.umap_target, l); 119 if ((error = namei(ndp)) != 0) 120 return (error); 121 122 /* 123 * Sanity check on lower vnode 124 */ 125 lowerrootvp = ndp->ni_vp; 126 #ifdef UMAPFS_DIAGNOSTIC 127 printf("vp = %p, check for VDIR...\n", lowerrootvp); 128 #endif 129 130 if (lowerrootvp->v_type != VDIR) { 131 vput(lowerrootvp); 132 return (EINVAL); 133 } 134 135 #ifdef UMAPFS_DIAGNOSTIC 136 printf("mp = %p\n", mp); 137 #endif 138 139 amp = (struct umap_mount *) malloc(sizeof(struct umap_mount), 140 M_UFSMNT, M_WAITOK); /* XXX */ 141 memset(amp, 0, sizeof(struct umap_mount)); 142 143 mp->mnt_data = amp; 144 mp->mnt_leaf = lowerrootvp->v_mount->mnt_leaf; 145 amp->umapm_vfs = lowerrootvp->v_mount; 146 if (amp->umapm_vfs->mnt_flag & MNT_LOCAL) 147 mp->mnt_flag |= MNT_LOCAL; 148 149 /* 150 * Now copy in the number of entries and maps for umap mapping. 151 */ 152 if (args.nentries > MAPFILEENTRIES || args.gnentries > GMAPFILEENTRIES) { 153 vput(lowerrootvp); 154 return (error); 155 } 156 157 amp->info_nentries = args.nentries; 158 amp->info_gnentries = args.gnentries; 159 error = copyin(args.mapdata, amp->info_mapdata, 160 2*sizeof(u_long)*args.nentries); 161 if (error) { 162 vput(lowerrootvp); 163 return (error); 164 } 165 166 #ifdef UMAPFS_DIAGNOSTIC 167 printf("umap_mount:nentries %d\n",args.nentries); 168 for (i = 0; i < args.nentries; i++) 169 printf(" %ld maps to %ld\n", amp->info_mapdata[i][0], 170 amp->info_mapdata[i][1]); 171 #endif 172 173 error = copyin(args.gmapdata, amp->info_gmapdata, 174 2*sizeof(u_long)*args.gnentries); 175 if (error) { 176 vput(lowerrootvp); 177 return (error); 178 } 179 180 #ifdef UMAPFS_DIAGNOSTIC 181 printf("umap_mount:gnentries %d\n",args.gnentries); 182 for (i = 0; i < args.gnentries; i++) 183 printf("\tgroup %ld maps to %ld\n", 184 amp->info_gmapdata[i][0], 185 amp->info_gmapdata[i][1]); 186 #endif 187 188 /* 189 * Make sure the mount point's sufficiently initialized 190 * that the node create call will work. 191 */ 192 vfs_getnewfsid(mp); 193 amp->umapm_size = sizeof(struct umap_node); 194 amp->umapm_tag = VT_UMAP; 195 amp->umapm_bypass = umap_bypass; 196 amp->umapm_alloc = layer_node_alloc; /* the default alloc is fine */ 197 amp->umapm_vnodeop_p = umap_vnodeop_p; 198 simple_lock_init(&->umapm_hashlock); 199 amp->umapm_node_hashtbl = hashinit(NUMAPNODECACHE, HASH_LIST, M_CACHE, 200 M_WAITOK, &->umapm_node_hash); 201 202 203 /* 204 * fix up umap node for root vnode. 205 */ 206 error = layer_node_create(mp, lowerrootvp, &vp); 207 /* 208 * Make sure the node alias worked 209 */ 210 if (error) { 211 vput(lowerrootvp); 212 free(amp, M_UFSMNT); /* XXX */ 213 return (error); 214 } 215 /* 216 * Unlock the node (either the lower or the alias) 217 */ 218 VOP_UNLOCK(vp, 0); 219 220 /* 221 * Keep a held reference to the root vnode. 222 * It is vrele'd in umapfs_unmount. 223 */ 224 vp->v_flag |= VROOT; 225 amp->umapm_rootvp = vp; 226 227 error = set_statvfs_info(path, UIO_USERSPACE, args.umap_target, 228 UIO_USERSPACE, mp, l); 229 #ifdef UMAPFS_DIAGNOSTIC 230 printf("umapfs_mount: lower %s, alias at %s\n", 231 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname); 232 #endif 233 return error; 234 } 235 236 /* 237 * Free reference to umap layer 238 */ 239 int 240 umapfs_unmount(mp, mntflags, l) 241 struct mount *mp; 242 int mntflags; 243 struct lwp *l; 244 { 245 struct vnode *rtvp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp; 246 int error; 247 int flags = 0; 248 249 #ifdef UMAPFS_DIAGNOSTIC 250 printf("umapfs_unmount(mp = %p)\n", mp); 251 #endif 252 253 if (mntflags & MNT_FORCE) 254 flags |= FORCECLOSE; 255 256 /* 257 * Clear out buffer cache. I don't think we 258 * ever get anything cached at this level at the 259 * moment, but who knows... 260 */ 261 #ifdef notyet 262 mntflushbuf(mp, 0); 263 if (mntinvalbuf(mp, 1)) 264 return (EBUSY); 265 #endif 266 if (rtvp->v_usecount > 1) 267 return (EBUSY); 268 if ((error = vflush(mp, rtvp, flags)) != 0) 269 return (error); 270 271 #ifdef UMAPFS_DIAGNOSTIC 272 vprint("alias root of lower", rtvp); 273 #endif 274 /* 275 * Release reference on underlying root vnode 276 */ 277 vrele(rtvp); 278 /* 279 * And blow it away for future re-use 280 */ 281 vgone(rtvp); 282 /* 283 * Finally, throw away the umap_mount structure 284 */ 285 free(mp->mnt_data, M_UFSMNT); /* XXX */ 286 mp->mnt_data = 0; 287 return (0); 288 } 289 290 SYSCTL_SETUP(sysctl_vfs_umap_setup, "sysctl vfs.umap subtree setup") 291 { 292 293 sysctl_createv(clog, 0, NULL, NULL, 294 CTLFLAG_PERMANENT, 295 CTLTYPE_NODE, "vfs", NULL, 296 NULL, 0, NULL, 0, 297 CTL_VFS, CTL_EOL); 298 sysctl_createv(clog, 0, NULL, NULL, 299 CTLFLAG_PERMANENT, 300 CTLTYPE_NODE, "umap", 301 SYSCTL_DESCR("UID/GID remapping file system"), 302 NULL, 0, NULL, 0, 303 CTL_VFS, 10, CTL_EOL); 304 /* 305 * XXX the "10" above could be dynamic, thereby eliminating 306 * one more instance of the "number to vfs" mapping problem, 307 * but "10" is the order as taken from sys/mount.h 308 */ 309 } 310 311 extern const struct vnodeopv_desc umapfs_vnodeop_opv_desc; 312 313 const struct vnodeopv_desc * const umapfs_vnodeopv_descs[] = { 314 &umapfs_vnodeop_opv_desc, 315 NULL, 316 }; 317 318 struct vfsops umapfs_vfsops = { 319 MOUNT_UMAP, 320 umapfs_mount, 321 layerfs_start, 322 umapfs_unmount, 323 layerfs_root, 324 layerfs_quotactl, 325 layerfs_statvfs, 326 layerfs_sync, 327 layerfs_vget, 328 layerfs_fhtovp, 329 layerfs_vptofh, 330 layerfs_init, 331 NULL, 332 layerfs_done, 333 NULL, /* vfs_mountroot */ 334 layerfs_snapshot, 335 vfs_stdextattrctl, 336 umapfs_vnodeopv_descs, 337 }; 338 VFS_ATTACH(umapfs_vfsops); 339
Indexes created Tue Oct 07 21:09:53 GMT 2025