| 1 | /* |
| 2 | * Copyright (c) 1992, 1993, 1995 |
| 3 | * The Regents of the University of California. All rights reserved. |
| 4 | * |
| 5 | * This code is derived from software donated to Berkeley by |
| 6 | * the UCLA Ficus project. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. All advertising materials mentioning features or use of this software |
| 17 | * must display the following acknowledgement: |
| 18 | * This product includes software developed by the University of |
| 19 | * California, Berkeley and its contributors. |
| 20 | * 4. Neither the name of the University nor the names of its contributors |
| 21 | * may be used to endorse or promote products derived from this software |
| 22 | * without specific prior written permission. |
| 23 | * |
| 24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 34 | * SUCH DAMAGE. |
| 35 | * |
| 36 | * @(#)umap_vfsops.c 8.8 (Berkeley) 5/14/95 |
| 37 | * |
| 38 | * $FreeBSD: src/sys/miscfs/umapfs/umap_vfsops.c,v 1.31.2.2 2001/09/11 09:49:53 kris Exp $ |
| 39 | * $DragonFly: src/sys/vfs/umapfs/Attic/umap_vfsops.c,v 1.18 2005/09/17 07:43:12 dillon Exp $ |
| 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/kernel.h> |
| 50 | #include <sys/proc.h> |
| 51 | #include <sys/vnode.h> |
| 52 | #include <sys/mount.h> |
| 53 | #include <sys/nlookup.h> |
| 54 | #include <sys/malloc.h> |
| 55 | #include "umap.h" |
| 56 | #include <vm/vm_zone.h> |
| 57 | |
| 58 | extern struct vnodeopv_entry_desc umap_vnodeop_entries[]; |
| 59 | |
| 60 | static MALLOC_DEFINE(M_UMAPFSMNT, "UMAP mount", "UMAP mount structure"); |
| 61 | |
| 62 | static int umapfs_fhtovp (struct mount *mp, struct fid *fidp, |
| 63 | struct vnode **vpp); |
| 64 | static int umapfs_checkexp (struct mount *mp, struct sockaddr *nam, |
| 65 | int *extflagsp, struct ucred **credanonp); |
| 66 | static int umapfs_mount (struct mount *mp, char *path, caddr_t data, |
| 67 | struct thread *td); |
| 68 | static int umapfs_quotactl (struct mount *mp, int cmd, uid_t uid, |
| 69 | caddr_t arg, struct thread *td); |
| 70 | static int umapfs_root (struct mount *mp, struct vnode **vpp); |
| 71 | static int umapfs_statfs (struct mount *mp, struct statfs *sbp, |
| 72 | struct thread *td); |
| 73 | static int umapfs_unmount (struct mount *mp, int mntflags, |
| 74 | struct thread *td); |
| 75 | static int umapfs_vget (struct mount *mp, ino_t ino, |
| 76 | struct vnode **vpp); |
| 77 | static int umapfs_vptofh (struct vnode *vp, struct fid *fhp); |
| 78 | static int umapfs_extattrctl (struct mount *mp, int cmd, |
| 79 | const char *attrname, caddr_t arg, |
| 80 | struct thread *td); |
| 81 | |
| 82 | /* |
| 83 | * Mount umap layer |
| 84 | */ |
| 85 | static int |
| 86 | umapfs_mount(struct mount *mp, char *path, caddr_t data, struct thread *td) |
| 87 | { |
| 88 | struct umap_args args; |
| 89 | struct vnode *lowerrootvp, *vp; |
| 90 | struct vnode *umapm_rootvp; |
| 91 | struct umap_mount *amp; |
| 92 | struct nlookupdata nd; |
| 93 | u_int size; |
| 94 | int error; |
| 95 | #ifdef DEBUG |
| 96 | int i; |
| 97 | #endif |
| 98 | |
| 99 | /* |
| 100 | * Only for root |
| 101 | */ |
| 102 | if ((error = suser(td)) != 0) |
| 103 | return (error); |
| 104 | |
| 105 | #ifdef DEBUG |
| 106 | printf("umapfs_mount(mp = %p)\n", (void *)mp); |
| 107 | #endif |
| 108 | |
| 109 | /* |
| 110 | * Update is a no-op |
| 111 | */ |
| 112 | if (mp->mnt_flag & MNT_UPDATE) { |
| 113 | return (EOPNOTSUPP); |
| 114 | } |
| 115 | |
| 116 | /* |
| 117 | * Get argument |
| 118 | */ |
| 119 | error = copyin(data, (caddr_t)&args, sizeof(struct umap_args)); |
| 120 | if (error) |
| 121 | return (error); |
| 122 | |
| 123 | /* |
| 124 | * Find lower node |
| 125 | */ |
| 126 | lowerrootvp = NULL; |
| 127 | error = nlookup_init(&nd, args.target, UIO_USERSPACE, NLC_FOLLOW); |
| 128 | if (error == 0) |
| 129 | error = nlookup(&nd); |
| 130 | if (error == 0) { |
| 131 | error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, |
| 132 | &lowerrootvp); |
| 133 | } |
| 134 | nlookup_done(&nd); |
| 135 | if (error) |
| 136 | return (error); |
| 137 | |
| 138 | /* |
| 139 | * Sanity check on lower vnode |
| 140 | */ |
| 141 | #ifdef DEBUG |
| 142 | printf("vp = %p, check for VDIR...\n", (void *)lowerrootvp); |
| 143 | #endif |
| 144 | if (lowerrootvp->v_type != VDIR) { |
| 145 | vput(lowerrootvp); |
| 146 | return (EINVAL); |
| 147 | } |
| 148 | |
| 149 | #ifdef DEBUG |
| 150 | printf("mp = %p\n", (void *)mp); |
| 151 | #endif |
| 152 | |
| 153 | amp = (struct umap_mount *) malloc(sizeof(struct umap_mount), |
| 154 | M_UMAPFSMNT, M_WAITOK); /* XXX */ |
| 155 | |
| 156 | /* |
| 157 | * Save reference to underlying FS |
| 158 | */ |
| 159 | amp->umapm_vfs = lowerrootvp->v_mount; |
| 160 | |
| 161 | /* |
| 162 | * Now copy in the number of entries and maps for umap mapping. |
| 163 | */ |
| 164 | if (args.nentries > MAPFILEENTRIES || args.gnentries > |
| 165 | GMAPFILEENTRIES) { |
| 166 | vput(lowerrootvp); |
| 167 | return (error); |
| 168 | } |
| 169 | |
| 170 | amp->info_nentries = args.nentries; |
| 171 | amp->info_gnentries = args.gnentries; |
| 172 | error = copyin(args.mapdata, (caddr_t)amp->info_mapdata, |
| 173 | 2*sizeof(u_long)*args.nentries); |
| 174 | if (error) |
| 175 | return (error); |
| 176 | |
| 177 | #ifdef DEBUG |
| 178 | printf("umap_mount:nentries %d\n",args.nentries); |
| 179 | for (i = 0; i < args.nentries; i++) |
| 180 | printf(" %lu maps to %lu\n", amp->info_mapdata[i][0], |
| 181 | amp->info_mapdata[i][1]); |
| 182 | #endif |
| 183 | |
| 184 | error = copyin(args.gmapdata, (caddr_t)amp->info_gmapdata, |
| 185 | 2*sizeof(u_long)*args.gnentries); |
| 186 | if (error) |
| 187 | return (error); |
| 188 | |
| 189 | #ifdef DEBUG |
| 190 | printf("umap_mount:gnentries %d\n",args.gnentries); |
| 191 | for (i = 0; i < args.gnentries; i++) |
| 192 | printf(" group %lu maps to %lu\n", |
| 193 | amp->info_gmapdata[i][0], |
| 194 | amp->info_gmapdata[i][1]); |
| 195 | #endif |
| 196 | |
| 197 | vfs_add_vnodeops(mp, &mp->mnt_vn_norm_ops, |
| 198 | umap_vnodeop_entries, 0); |
| 199 | |
| 200 | /* |
| 201 | * Save reference. Each mount also holds |
| 202 | * a reference on the root vnode. |
| 203 | */ |
| 204 | error = umap_node_create(mp, lowerrootvp, &vp); |
| 205 | /* |
| 206 | * Unlock the node (either the lower or the alias) |
| 207 | */ |
| 208 | VOP_UNLOCK(vp, 0, td); |
| 209 | /* |
| 210 | * Make sure the node alias worked |
| 211 | */ |
| 212 | if (error) { |
| 213 | vrele(lowerrootvp); |
| 214 | free(amp, M_UMAPFSMNT); /* XXX */ |
| 215 | return (error); |
| 216 | } |
| 217 | |
| 218 | /* |
| 219 | * Keep a held reference to the root vnode. |
| 220 | * It is vrele'd in umapfs_unmount. |
| 221 | */ |
| 222 | umapm_rootvp = vp; |
| 223 | umapm_rootvp->v_flag |= VROOT; |
| 224 | amp->umapm_rootvp = umapm_rootvp; |
| 225 | if (UMAPVPTOLOWERVP(umapm_rootvp)->v_mount->mnt_flag & MNT_LOCAL) |
| 226 | mp->mnt_flag |= MNT_LOCAL; |
| 227 | mp->mnt_data = (qaddr_t) amp; |
| 228 | vfs_getnewfsid(mp); |
| 229 | |
| 230 | (void) copyinstr(args.target, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, |
| 231 | &size); |
| 232 | bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); |
| 233 | (void)umapfs_statfs(mp, &mp->mnt_stat, td); |
| 234 | return (0); |
| 235 | } |
| 236 | |
| 237 | /* |
| 238 | * Free reference to umap layer |
| 239 | */ |
| 240 | static int |
| 241 | umapfs_unmount(struct mount *mp, int mntflags, struct thread *td) |
| 242 | { |
| 243 | int error; |
| 244 | int flags = 0; |
| 245 | |
| 246 | #ifdef DEBUG |
| 247 | printf("umapfs_unmount(mp = %p)\n", (void *)mp); |
| 248 | #endif |
| 249 | |
| 250 | if (mntflags & MNT_FORCE) |
| 251 | flags |= FORCECLOSE; |
| 252 | |
| 253 | /* |
| 254 | * Clear out buffer cache. I don't think we |
| 255 | * ever get anything cached at this level at the |
| 256 | * moment, but who knows... |
| 257 | */ |
| 258 | #ifdef notyet |
| 259 | mntflushbuf(mp, 0); |
| 260 | if (mntinvalbuf(mp, 1)) |
| 261 | return (EBUSY); |
| 262 | #endif |
| 263 | /* There is 1 extra root vnode reference (umapm_rootvp). */ |
| 264 | error = vflush(mp, 1, flags); |
| 265 | if (error) |
| 266 | return (error); |
| 267 | |
| 268 | /* |
| 269 | * Finally, throw away the umap_mount structure |
| 270 | */ |
| 271 | free(mp->mnt_data, M_UMAPFSMNT); /* XXX */ |
| 272 | mp->mnt_data = 0; |
| 273 | return (0); |
| 274 | } |
| 275 | |
| 276 | static int |
| 277 | umapfs_root(struct mount *mp, struct vnode **vpp) |
| 278 | { |
| 279 | struct thread *td = curthread; /* XXX */ |
| 280 | struct vnode *vp; |
| 281 | |
| 282 | #ifdef DEBUG |
| 283 | printf("umapfs_root(mp = %p, vp = %p->%p)\n", |
| 284 | (void *)mp, (void *)MOUNTTOUMAPMOUNT(mp)->umapm_rootvp, |
| 285 | (void *)UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp)); |
| 286 | #endif |
| 287 | |
| 288 | /* |
| 289 | * Return locked reference to root. |
| 290 | */ |
| 291 | vp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp; |
| 292 | vref(vp); |
| 293 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); |
| 294 | *vpp = vp; |
| 295 | return (0); |
| 296 | } |
| 297 | |
| 298 | static int |
| 299 | umapfs_quotactl(struct mount *mp, int cmd, uid_t uid, |
| 300 | caddr_t arg, struct thread *td) |
| 301 | { |
| 302 | return (VFS_QUOTACTL(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, cmd, uid, arg, td)); |
| 303 | } |
| 304 | |
| 305 | static int |
| 306 | umapfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) |
| 307 | { |
| 308 | int error; |
| 309 | struct statfs mstat; |
| 310 | |
| 311 | #ifdef DEBUG |
| 312 | printf("umapfs_statfs(mp = %p, vp = %p->%p)\n", |
| 313 | (void *)mp, (void *)MOUNTTOUMAPMOUNT(mp)->umapm_rootvp, |
| 314 | (void *)UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp)); |
| 315 | #endif |
| 316 | |
| 317 | bzero(&mstat, sizeof(mstat)); |
| 318 | |
| 319 | error = VFS_STATFS(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, &mstat, td); |
| 320 | if (error) |
| 321 | return (error); |
| 322 | |
| 323 | /* now copy across the "interesting" information and fake the rest */ |
| 324 | sbp->f_type = mstat.f_type; |
| 325 | sbp->f_flags = mstat.f_flags; |
| 326 | sbp->f_bsize = mstat.f_bsize; |
| 327 | sbp->f_iosize = mstat.f_iosize; |
| 328 | sbp->f_blocks = mstat.f_blocks; |
| 329 | sbp->f_bfree = mstat.f_bfree; |
| 330 | sbp->f_bavail = mstat.f_bavail; |
| 331 | sbp->f_files = mstat.f_files; |
| 332 | sbp->f_ffree = mstat.f_ffree; |
| 333 | if (sbp != &mp->mnt_stat) { |
| 334 | bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); |
| 335 | bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); |
| 336 | } |
| 337 | return (0); |
| 338 | } |
| 339 | |
| 340 | static int |
| 341 | umapfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) |
| 342 | { |
| 343 | |
| 344 | return (VFS_VGET(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, ino, vpp)); |
| 345 | } |
| 346 | |
| 347 | static int |
| 348 | umapfs_fhtovp(struct mount *mp, struct fid *fidp, struct vnode **vpp) |
| 349 | { |
| 350 | |
| 351 | return (VFS_FHTOVP(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, fidp, vpp)); |
| 352 | } |
| 353 | |
| 354 | static int |
| 355 | umapfs_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp, |
| 356 | struct ucred **credanonp) |
| 357 | { |
| 358 | |
| 359 | return (VFS_CHECKEXP(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, nam, |
| 360 | exflagsp, credanonp)); |
| 361 | } |
| 362 | |
| 363 | static int |
| 364 | umapfs_vptofh(struct vnode *vp, struct fid *fhp) |
| 365 | { |
| 366 | return (VFS_VPTOFH(UMAPVPTOLOWERVP(vp), fhp)); |
| 367 | } |
| 368 | |
| 369 | static int |
| 370 | umapfs_extattrctl(struct mount *mp, int cmd, const char *attrname, |
| 371 | caddr_t arg, struct thread *td) |
| 372 | { |
| 373 | return (VFS_EXTATTRCTL(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, cmd, attrname, |
| 374 | arg, td)); |
| 375 | } |
| 376 | |
| 377 | |
| 378 | static struct vfsops umap_vfsops = { |
| 379 | .vfs_mount = umapfs_mount, |
| 380 | .vfs_unmount = umapfs_unmount, |
| 381 | .vfs_root = umapfs_root, |
| 382 | .vfs_quotactl = umapfs_quotactl, |
| 383 | .vfs_statfs = umapfs_statfs, |
| 384 | .vfs_sync = vfs_stdsync, |
| 385 | .vfs_vget = umapfs_vget, |
| 386 | .vfs_fhtovp = umapfs_fhtovp, |
| 387 | .vfs_checkexp = umapfs_checkexp, |
| 388 | .vfs_vptofh = umapfs_vptofh, |
| 389 | .vfs_init = umapfs_init, |
| 390 | .vfs_extattrctl = umapfs_extattrctl |
| 391 | }; |
| 392 | |
| 393 | VFS_SET(umap_vfsops, umap, VFCF_LOOPBACK); |