| 1 | /* |
| 2 | * Copyright (c) 1989, 1993 |
| 3 | * The Regents of the University of California. All rights reserved. |
| 4 | * (c) UNIX System Laboratories, Inc. |
| 5 | * All or some portions of this file are derived from material licensed |
| 6 | * to the University of California by American Telephone and Telegraph |
| 7 | * Co. or Unix System Laboratories, Inc. and are reproduced herein with |
| 8 | * the permission of UNIX System Laboratories, Inc. |
| 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. All advertising materials mentioning features or use of this software |
| 19 | * must display the following acknowledgement: |
| 20 | * This product includes software developed by the University of |
| 21 | * California, Berkeley and its contributors. |
| 22 | * 4. Neither the name of the University nor the names of its contributors |
| 23 | * may be used to endorse or promote products derived from this software |
| 24 | * without specific prior written permission. |
| 25 | * |
| 26 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 27 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 30 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 31 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 32 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 33 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 34 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 35 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 36 | * SUCH DAMAGE. |
| 37 | * |
| 38 | * @(#)vfs_syscalls.c 8.13 (Berkeley) 4/15/94 |
| 39 | * $FreeBSD: src/sys/kern/vfs_syscalls.c,v 1.151.2.18 2003/04/04 20:35:58 tegge Exp $ |
| 40 | * $DragonFly: src/sys/kern/vfs_syscalls.c,v 1.46 2004/11/12 00:09:24 dillon Exp $ |
| 41 | */ |
| 42 | |
| 43 | #include <sys/param.h> |
| 44 | #include <sys/systm.h> |
| 45 | #include <sys/buf.h> |
| 46 | #include <sys/conf.h> |
| 47 | #include <sys/sysent.h> |
| 48 | #include <sys/malloc.h> |
| 49 | #include <sys/mount.h> |
| 50 | #include <sys/sysproto.h> |
| 51 | #include <sys/filedesc.h> |
| 52 | #include <sys/kernel.h> |
| 53 | #include <sys/fcntl.h> |
| 54 | #include <sys/file.h> |
| 55 | #include <sys/linker.h> |
| 56 | #include <sys/stat.h> |
| 57 | #include <sys/unistd.h> |
| 58 | #include <sys/vnode.h> |
| 59 | #include <sys/proc.h> |
| 60 | #include <sys/namei.h> |
| 61 | #include <sys/nlookup.h> |
| 62 | #include <sys/dirent.h> |
| 63 | #include <sys/extattr.h> |
| 64 | #include <sys/kern_syscall.h> |
| 65 | |
| 66 | #include <machine/limits.h> |
| 67 | #include <vfs/union/union.h> |
| 68 | #include <sys/sysctl.h> |
| 69 | #include <vm/vm.h> |
| 70 | #include <vm/vm_object.h> |
| 71 | #include <vm/vm_zone.h> |
| 72 | #include <vm/vm_page.h> |
| 73 | |
| 74 | #include <sys/file2.h> |
| 75 | |
| 76 | static int checkvp_chdir (struct vnode *vn, struct thread *td); |
| 77 | static void checkdirs (struct vnode *olddp, struct namecache *ncp); |
| 78 | static int chroot_refuse_vdir_fds (struct filedesc *fdp); |
| 79 | static int getutimes (const struct timeval *, struct timespec *); |
| 80 | static int setfown (struct vnode *, uid_t, gid_t); |
| 81 | static int setfmode (struct vnode *, int); |
| 82 | static int setfflags (struct vnode *, int); |
| 83 | static int setutimes (struct vnode *, const struct timespec *, int); |
| 84 | static int usermount = 0; /* if 1, non-root can mount fs. */ |
| 85 | |
| 86 | int (*union_dircheckp) (struct thread *, struct vnode **, struct file *); |
| 87 | |
| 88 | SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, ""); |
| 89 | |
| 90 | /* |
| 91 | * Virtual File System System Calls |
| 92 | */ |
| 93 | |
| 94 | /* |
| 95 | * Mount a file system. |
| 96 | */ |
| 97 | /* |
| 98 | * mount_args(char *type, char *path, int flags, caddr_t data) |
| 99 | */ |
| 100 | /* ARGSUSED */ |
| 101 | int |
| 102 | mount(struct mount_args *uap) |
| 103 | { |
| 104 | struct thread *td = curthread; |
| 105 | struct proc *p = td->td_proc; |
| 106 | struct vnode *vp; |
| 107 | struct namecache *ncp; |
| 108 | struct mount *mp; |
| 109 | struct vfsconf *vfsp; |
| 110 | int error, flag = 0, flag2 = 0; |
| 111 | struct vattr va; |
| 112 | struct nlookupdata nd; |
| 113 | char fstypename[MFSNAMELEN]; |
| 114 | lwkt_tokref ilock; |
| 115 | struct nlcomponent nlc; |
| 116 | |
| 117 | KKASSERT(p); |
| 118 | if (p->p_ucred->cr_prison != NULL) |
| 119 | return (EPERM); |
| 120 | if (usermount == 0 && (error = suser(td))) |
| 121 | return (error); |
| 122 | /* |
| 123 | * Do not allow NFS export by non-root users. |
| 124 | */ |
| 125 | if (SCARG(uap, flags) & MNT_EXPORTED) { |
| 126 | error = suser(td); |
| 127 | if (error) |
| 128 | return (error); |
| 129 | } |
| 130 | /* |
| 131 | * Silently enforce MNT_NOSUID and MNT_NODEV for non-root users |
| 132 | */ |
| 133 | if (suser(td)) |
| 134 | SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; |
| 135 | |
| 136 | /* |
| 137 | * Lookup the requested path and extract the ncp and vnode. |
| 138 | */ |
| 139 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 140 | if (error == 0) { |
| 141 | if ((error = nlookup(&nd)) == 0) { |
| 142 | if (nd.nl_ncp->nc_vp == NULL) |
| 143 | error = ENOENT; |
| 144 | } |
| 145 | } |
| 146 | if (error) { |
| 147 | nlookup_done(&nd); |
| 148 | return (error); |
| 149 | } |
| 150 | |
| 151 | /* |
| 152 | * Extract the locked+refd ncp and cleanup the nd structure |
| 153 | */ |
| 154 | ncp = nd.nl_ncp; |
| 155 | nd.nl_ncp = NULL; |
| 156 | nlookup_done(&nd); |
| 157 | |
| 158 | /* |
| 159 | * now we have the locked ref'd ncp and unreferenced vnode. |
| 160 | */ |
| 161 | vp = ncp->nc_vp; |
| 162 | if ((error = vget(vp, LK_EXCLUSIVE, td)) != 0) { |
| 163 | cache_put(ncp); |
| 164 | return (error); |
| 165 | } |
| 166 | cache_unlock(ncp); |
| 167 | |
| 168 | /* |
| 169 | * Now we have an unlocked ref'd ncp and a locked ref'd vp |
| 170 | */ |
| 171 | if (SCARG(uap, flags) & MNT_UPDATE) { |
| 172 | if ((vp->v_flag & VROOT) == 0) { |
| 173 | cache_drop(ncp); |
| 174 | vput(vp); |
| 175 | return (EINVAL); |
| 176 | } |
| 177 | mp = vp->v_mount; |
| 178 | flag = mp->mnt_flag; |
| 179 | flag2 = mp->mnt_kern_flag; |
| 180 | /* |
| 181 | * We only allow the filesystem to be reloaded if it |
| 182 | * is currently mounted read-only. |
| 183 | */ |
| 184 | if ((SCARG(uap, flags) & MNT_RELOAD) && |
| 185 | ((mp->mnt_flag & MNT_RDONLY) == 0)) { |
| 186 | cache_drop(ncp); |
| 187 | vput(vp); |
| 188 | return (EOPNOTSUPP); /* Needs translation */ |
| 189 | } |
| 190 | /* |
| 191 | * Only root, or the user that did the original mount is |
| 192 | * permitted to update it. |
| 193 | */ |
| 194 | if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && |
| 195 | (error = suser(td))) { |
| 196 | cache_drop(ncp); |
| 197 | vput(vp); |
| 198 | return (error); |
| 199 | } |
| 200 | if (vfs_busy(mp, LK_NOWAIT, NULL, td)) { |
| 201 | cache_drop(ncp); |
| 202 | vput(vp); |
| 203 | return (EBUSY); |
| 204 | } |
| 205 | if ((vp->v_flag & VMOUNT) != 0 || |
| 206 | vp->v_mountedhere != NULL) { |
| 207 | cache_drop(ncp); |
| 208 | vfs_unbusy(mp, td); |
| 209 | vput(vp); |
| 210 | return (EBUSY); |
| 211 | } |
| 212 | vp->v_flag |= VMOUNT; |
| 213 | mp->mnt_flag |= |
| 214 | SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); |
| 215 | VOP_UNLOCK(vp, 0, td); |
| 216 | goto update; |
| 217 | } |
| 218 | /* |
| 219 | * If the user is not root, ensure that they own the directory |
| 220 | * onto which we are attempting to mount. |
| 221 | */ |
| 222 | if ((error = VOP_GETATTR(vp, &va, td)) || |
| 223 | (va.va_uid != p->p_ucred->cr_uid && |
| 224 | (error = suser(td)))) { |
| 225 | cache_drop(ncp); |
| 226 | vput(vp); |
| 227 | return (error); |
| 228 | } |
| 229 | if ((error = vinvalbuf(vp, V_SAVE, td, 0, 0)) != 0) { |
| 230 | cache_drop(ncp); |
| 231 | vput(vp); |
| 232 | return (error); |
| 233 | } |
| 234 | if (vp->v_type != VDIR) { |
| 235 | cache_drop(ncp); |
| 236 | vput(vp); |
| 237 | return (ENOTDIR); |
| 238 | } |
| 239 | if ((error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL)) != 0) { |
| 240 | cache_drop(ncp); |
| 241 | vput(vp); |
| 242 | return (error); |
| 243 | } |
| 244 | for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) { |
| 245 | if (!strcmp(vfsp->vfc_name, fstypename)) |
| 246 | break; |
| 247 | } |
| 248 | if (vfsp == NULL) { |
| 249 | linker_file_t lf; |
| 250 | |
| 251 | /* Only load modules for root (very important!) */ |
| 252 | if ((error = suser(td)) != 0) { |
| 253 | cache_drop(ncp); |
| 254 | vput(vp); |
| 255 | return error; |
| 256 | } |
| 257 | error = linker_load_file(fstypename, &lf); |
| 258 | if (error || lf == NULL) { |
| 259 | cache_drop(ncp); |
| 260 | vput(vp); |
| 261 | if (lf == NULL) |
| 262 | error = ENODEV; |
| 263 | return error; |
| 264 | } |
| 265 | lf->userrefs++; |
| 266 | /* lookup again, see if the VFS was loaded */ |
| 267 | for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) { |
| 268 | if (!strcmp(vfsp->vfc_name, fstypename)) |
| 269 | break; |
| 270 | } |
| 271 | if (vfsp == NULL) { |
| 272 | lf->userrefs--; |
| 273 | linker_file_unload(lf); |
| 274 | cache_drop(ncp); |
| 275 | vput(vp); |
| 276 | return (ENODEV); |
| 277 | } |
| 278 | } |
| 279 | if ((vp->v_flag & VMOUNT) != 0 || |
| 280 | vp->v_mountedhere != NULL) { |
| 281 | cache_drop(ncp); |
| 282 | vput(vp); |
| 283 | return (EBUSY); |
| 284 | } |
| 285 | vp->v_flag |= VMOUNT; |
| 286 | |
| 287 | /* |
| 288 | * Allocate and initialize the filesystem. |
| 289 | */ |
| 290 | mp = malloc(sizeof(struct mount), M_MOUNT, M_ZERO|M_WAITOK); |
| 291 | TAILQ_INIT(&mp->mnt_nvnodelist); |
| 292 | TAILQ_INIT(&mp->mnt_reservedvnlist); |
| 293 | mp->mnt_nvnodelistsize = 0; |
| 294 | lockinit(&mp->mnt_lock, 0, "vfslock", 0, LK_NOPAUSE); |
| 295 | vfs_busy(mp, LK_NOWAIT, NULL, td); |
| 296 | mp->mnt_op = vfsp->vfc_vfsops; |
| 297 | mp->mnt_vfc = vfsp; |
| 298 | vfsp->vfc_refcount++; |
| 299 | mp->mnt_stat.f_type = vfsp->vfc_typenum; |
| 300 | mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK; |
| 301 | strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); |
| 302 | mp->mnt_vnodecovered = vp; |
| 303 | mp->mnt_stat.f_owner = p->p_ucred->cr_uid; |
| 304 | mp->mnt_iosize_max = DFLTPHYS; |
| 305 | VOP_UNLOCK(vp, 0, td); |
| 306 | update: |
| 307 | /* |
| 308 | * Set the mount level flags. |
| 309 | */ |
| 310 | if (SCARG(uap, flags) & MNT_RDONLY) |
| 311 | mp->mnt_flag |= MNT_RDONLY; |
| 312 | else if (mp->mnt_flag & MNT_RDONLY) |
| 313 | mp->mnt_kern_flag |= MNTK_WANTRDWR; |
| 314 | mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | |
| 315 | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOATIME | |
| 316 | MNT_NOSYMFOLLOW | MNT_IGNORE | |
| 317 | MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR); |
| 318 | mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | |
| 319 | MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_FORCE | |
| 320 | MNT_NOSYMFOLLOW | MNT_IGNORE | |
| 321 | MNT_NOATIME | MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR); |
| 322 | /* |
| 323 | * Mount the filesystem. |
| 324 | * XXX The final recipients of VFS_MOUNT just overwrite the ndp they |
| 325 | * get. |
| 326 | */ |
| 327 | error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), td); |
| 328 | if (mp->mnt_flag & MNT_UPDATE) { |
| 329 | if (mp->mnt_kern_flag & MNTK_WANTRDWR) |
| 330 | mp->mnt_flag &= ~MNT_RDONLY; |
| 331 | mp->mnt_flag &=~ (MNT_UPDATE | MNT_RELOAD | MNT_FORCE); |
| 332 | mp->mnt_kern_flag &=~ MNTK_WANTRDWR; |
| 333 | if (error) { |
| 334 | mp->mnt_flag = flag; |
| 335 | mp->mnt_kern_flag = flag2; |
| 336 | } |
| 337 | vfs_unbusy(mp, td); |
| 338 | vp->v_flag &= ~VMOUNT; |
| 339 | vrele(vp); |
| 340 | cache_drop(ncp); |
| 341 | return (error); |
| 342 | } |
| 343 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); |
| 344 | /* |
| 345 | * Put the new filesystem on the mount list after root. The mount |
| 346 | * point gets its own mnt_ncp which is a special ncp linking the |
| 347 | * vnode-under to the root of the new mount. The lookup code |
| 348 | * detects the mount point going forward and detects the special |
| 349 | * mnt_ncp via NCP_MOUNTPT going backwards. |
| 350 | * |
| 351 | * It is not necessary to invalidate or purge the vnode underneath |
| 352 | * because elements under the mount will be given their own glue |
| 353 | * namecache record. |
| 354 | */ |
| 355 | if (!error) { |
| 356 | nlc.nlc_nameptr = ""; |
| 357 | nlc.nlc_namelen = 0; |
| 358 | mp->mnt_ncp = cache_nlookup(ncp, &nlc); |
| 359 | mp->mnt_ncp->nc_flag |= NCF_MOUNTPT; |
| 360 | mp->mnt_ncp->nc_mount = mp; |
| 361 | cache_drop(ncp); |
| 362 | /* XXX get the root of the fs and cache_setvp(mnt_ncp...) */ |
| 363 | vp->v_flag &= ~VMOUNT; |
| 364 | vp->v_mountedhere = mp; |
| 365 | lwkt_gettoken(&ilock, &mountlist_token); |
| 366 | TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); |
| 367 | lwkt_reltoken(&ilock); |
| 368 | checkdirs(vp, mp->mnt_ncp); |
| 369 | cache_unlock(mp->mnt_ncp); /* leave ref intact */ |
| 370 | VOP_UNLOCK(vp, 0, td); |
| 371 | error = vfs_allocate_syncvnode(mp); |
| 372 | vfs_unbusy(mp, td); |
| 373 | if ((error = VFS_START(mp, 0, td)) != 0) |
| 374 | vrele(vp); |
| 375 | } else { |
| 376 | vfs_rm_vnodeops(&mp->mnt_vn_ops); |
| 377 | vfs_rm_vnodeops(&mp->mnt_vn_spec_ops); |
| 378 | vfs_rm_vnodeops(&mp->mnt_vn_fifo_ops); |
| 379 | vp->v_flag &= ~VMOUNT; |
| 380 | mp->mnt_vfc->vfc_refcount--; |
| 381 | vfs_unbusy(mp, td); |
| 382 | free(mp, M_MOUNT); |
| 383 | cache_drop(ncp); |
| 384 | vput(vp); |
| 385 | } |
| 386 | return (error); |
| 387 | } |
| 388 | |
| 389 | /* |
| 390 | * Scan all active processes to see if any of them have a current |
| 391 | * or root directory onto which the new filesystem has just been |
| 392 | * mounted. If so, replace them with the new mount point. |
| 393 | * |
| 394 | * The passed ncp is ref'd and locked (from the mount code) and |
| 395 | * must be associated with the vnode representing the root of the |
| 396 | * mount point. |
| 397 | */ |
| 398 | static void |
| 399 | checkdirs(struct vnode *olddp, struct namecache *ncp) |
| 400 | { |
| 401 | struct filedesc *fdp; |
| 402 | struct vnode *newdp; |
| 403 | struct mount *mp; |
| 404 | struct proc *p; |
| 405 | |
| 406 | if (olddp->v_usecount == 1) |
| 407 | return; |
| 408 | mp = olddp->v_mountedhere; |
| 409 | if (VFS_ROOT(mp, &newdp)) |
| 410 | panic("mount: lost mount"); |
| 411 | cache_setvp(ncp, newdp); |
| 412 | |
| 413 | if (rootvnode == olddp) { |
| 414 | vref(newdp); |
| 415 | vfs_cache_setroot(newdp, cache_hold(ncp)); |
| 416 | } |
| 417 | |
| 418 | FOREACH_PROC_IN_SYSTEM(p) { |
| 419 | fdp = p->p_fd; |
| 420 | if (fdp->fd_cdir == olddp) { |
| 421 | vrele(fdp->fd_cdir); |
| 422 | vref(newdp); |
| 423 | fdp->fd_cdir = newdp; |
| 424 | cache_drop(fdp->fd_ncdir); |
| 425 | fdp->fd_ncdir = cache_hold(ncp); |
| 426 | } |
| 427 | if (fdp->fd_rdir == olddp) { |
| 428 | vrele(fdp->fd_rdir); |
| 429 | vref(newdp); |
| 430 | fdp->fd_rdir = newdp; |
| 431 | cache_drop(fdp->fd_nrdir); |
| 432 | fdp->fd_nrdir = cache_hold(ncp); |
| 433 | } |
| 434 | } |
| 435 | vput(newdp); |
| 436 | } |
| 437 | |
| 438 | /* |
| 439 | * Unmount a file system. |
| 440 | * |
| 441 | * Note: unmount takes a path to the vnode mounted on as argument, |
| 442 | * not special file (as before). |
| 443 | */ |
| 444 | /* |
| 445 | * umount_args(char *path, int flags) |
| 446 | */ |
| 447 | /* ARGSUSED */ |
| 448 | int |
| 449 | unmount(struct unmount_args *uap) |
| 450 | { |
| 451 | struct thread *td = curthread; |
| 452 | struct proc *p = td->td_proc; |
| 453 | struct vnode *vp; |
| 454 | struct mount *mp; |
| 455 | int error; |
| 456 | struct nlookupdata nd; |
| 457 | |
| 458 | KKASSERT(p); |
| 459 | if (p->p_ucred->cr_prison != NULL) |
| 460 | return (EPERM); |
| 461 | if (usermount == 0 && (error = suser(td))) |
| 462 | return (error); |
| 463 | |
| 464 | vp = NULL; |
| 465 | error = nlookup_init(&nd, SCARG(uap, path), UIO_USERSPACE, NLC_FOLLOW); |
| 466 | if (error == 0) |
| 467 | error = nlookup(&nd); |
| 468 | if (error == 0) |
| 469 | error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp); |
| 470 | nlookup_done(&nd); |
| 471 | if (error) |
| 472 | return (error); |
| 473 | |
| 474 | mp = vp->v_mount; |
| 475 | |
| 476 | /* |
| 477 | * Only root, or the user that did the original mount is |
| 478 | * permitted to unmount this filesystem. |
| 479 | */ |
| 480 | if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && |
| 481 | (error = suser(td))) { |
| 482 | vput(vp); |
| 483 | return (error); |
| 484 | } |
| 485 | |
| 486 | /* |
| 487 | * Don't allow unmounting the root file system. |
| 488 | */ |
| 489 | if (mp->mnt_flag & MNT_ROOTFS) { |
| 490 | vput(vp); |
| 491 | return (EINVAL); |
| 492 | } |
| 493 | |
| 494 | /* |
| 495 | * Must be the root of the filesystem |
| 496 | */ |
| 497 | if ((vp->v_flag & VROOT) == 0) { |
| 498 | vput(vp); |
| 499 | return (EINVAL); |
| 500 | } |
| 501 | vput(vp); |
| 502 | return (dounmount(mp, SCARG(uap, flags), td)); |
| 503 | } |
| 504 | |
| 505 | /* |
| 506 | * Do the actual file system unmount. |
| 507 | */ |
| 508 | int |
| 509 | dounmount(struct mount *mp, int flags, struct thread *td) |
| 510 | { |
| 511 | struct vnode *coveredvp; |
| 512 | int error; |
| 513 | int async_flag; |
| 514 | lwkt_tokref ilock; |
| 515 | |
| 516 | lwkt_gettoken(&ilock, &mountlist_token); |
| 517 | if (mp->mnt_kern_flag & MNTK_UNMOUNT) { |
| 518 | lwkt_reltoken(&ilock); |
| 519 | return (EBUSY); |
| 520 | } |
| 521 | mp->mnt_kern_flag |= MNTK_UNMOUNT; |
| 522 | /* Allow filesystems to detect that a forced unmount is in progress. */ |
| 523 | if (flags & MNT_FORCE) |
| 524 | mp->mnt_kern_flag |= MNTK_UNMOUNTF; |
| 525 | error = lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK | |
| 526 | ((flags & MNT_FORCE) ? 0 : LK_NOWAIT), &ilock, td); |
| 527 | if (error) { |
| 528 | mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); |
| 529 | if (mp->mnt_kern_flag & MNTK_MWAIT) |
| 530 | wakeup(mp); |
| 531 | return (error); |
| 532 | } |
| 533 | |
| 534 | if (mp->mnt_flag & MNT_EXPUBLIC) |
| 535 | vfs_setpublicfs(NULL, NULL, NULL); |
| 536 | |
| 537 | vfs_msync(mp, MNT_WAIT); |
| 538 | async_flag = mp->mnt_flag & MNT_ASYNC; |
| 539 | mp->mnt_flag &=~ MNT_ASYNC; |
| 540 | cache_purgevfs(mp); /* remove cache entries for this file sys */ |
| 541 | if (mp->mnt_syncer != NULL) |
| 542 | vrele(mp->mnt_syncer); |
| 543 | if (((mp->mnt_flag & MNT_RDONLY) || |
| 544 | (error = VFS_SYNC(mp, MNT_WAIT, td)) == 0) || |
| 545 | (flags & MNT_FORCE)) |
| 546 | error = VFS_UNMOUNT(mp, flags, td); |
| 547 | lwkt_gettokref(&ilock); |
| 548 | if (error) { |
| 549 | if (mp->mnt_syncer == NULL) |
| 550 | vfs_allocate_syncvnode(mp); |
| 551 | mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); |
| 552 | mp->mnt_flag |= async_flag; |
| 553 | lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, |
| 554 | &ilock, td); |
| 555 | if (mp->mnt_kern_flag & MNTK_MWAIT) |
| 556 | wakeup(mp); |
| 557 | return (error); |
| 558 | } |
| 559 | TAILQ_REMOVE(&mountlist, mp, mnt_list); |
| 560 | |
| 561 | /* |
| 562 | * Remove any installed vnode ops here so the individual VFSs don't |
| 563 | * have to. |
| 564 | */ |
| 565 | vfs_rm_vnodeops(&mp->mnt_vn_ops); |
| 566 | vfs_rm_vnodeops(&mp->mnt_vn_spec_ops); |
| 567 | vfs_rm_vnodeops(&mp->mnt_vn_fifo_ops); |
| 568 | |
| 569 | if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { |
| 570 | coveredvp->v_mountedhere = NULL; |
| 571 | vrele(coveredvp); |
| 572 | cache_drop(mp->mnt_ncp); |
| 573 | mp->mnt_ncp = NULL; |
| 574 | } |
| 575 | mp->mnt_vfc->vfc_refcount--; |
| 576 | if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) |
| 577 | panic("unmount: dangling vnode"); |
| 578 | lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &ilock, td); |
| 579 | if (mp->mnt_kern_flag & MNTK_MWAIT) |
| 580 | wakeup(mp); |
| 581 | free(mp, M_MOUNT); |
| 582 | return (0); |
| 583 | } |
| 584 | |
| 585 | /* |
| 586 | * Sync each mounted filesystem. |
| 587 | */ |
| 588 | |
| 589 | #ifdef DEBUG |
| 590 | static int syncprt = 0; |
| 591 | SYSCTL_INT(_debug, OID_AUTO, syncprt, CTLFLAG_RW, &syncprt, 0, ""); |
| 592 | #endif /* DEBUG */ |
| 593 | |
| 594 | /* ARGSUSED */ |
| 595 | int |
| 596 | sync(struct sync_args *uap) |
| 597 | { |
| 598 | struct thread *td = curthread; |
| 599 | struct mount *mp, *nmp; |
| 600 | lwkt_tokref ilock; |
| 601 | int asyncflag; |
| 602 | |
| 603 | lwkt_gettoken(&ilock, &mountlist_token); |
| 604 | for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { |
| 605 | if (vfs_busy(mp, LK_NOWAIT, &ilock, td)) { |
| 606 | nmp = TAILQ_NEXT(mp, mnt_list); |
| 607 | continue; |
| 608 | } |
| 609 | if ((mp->mnt_flag & MNT_RDONLY) == 0) { |
| 610 | asyncflag = mp->mnt_flag & MNT_ASYNC; |
| 611 | mp->mnt_flag &= ~MNT_ASYNC; |
| 612 | vfs_msync(mp, MNT_NOWAIT); |
| 613 | VFS_SYNC(mp, MNT_NOWAIT, td); |
| 614 | mp->mnt_flag |= asyncflag; |
| 615 | } |
| 616 | lwkt_gettokref(&ilock); |
| 617 | nmp = TAILQ_NEXT(mp, mnt_list); |
| 618 | vfs_unbusy(mp, td); |
| 619 | } |
| 620 | lwkt_reltoken(&ilock); |
| 621 | /* |
| 622 | * print out buffer pool stat information on each sync() call. |
| 623 | */ |
| 624 | #ifdef DEBUG |
| 625 | if (syncprt) |
| 626 | vfs_bufstats(); |
| 627 | #endif /* DEBUG */ |
| 628 | return (0); |
| 629 | } |
| 630 | |
| 631 | /* XXX PRISON: could be per prison flag */ |
| 632 | static int prison_quotas; |
| 633 | #if 0 |
| 634 | SYSCTL_INT(_kern_prison, OID_AUTO, quotas, CTLFLAG_RW, &prison_quotas, 0, ""); |
| 635 | #endif |
| 636 | |
| 637 | /* |
| 638 | * quotactl_args(char *path, int fcmd, int uid, caddr_t arg) |
| 639 | * |
| 640 | * Change filesystem quotas. |
| 641 | */ |
| 642 | /* ARGSUSED */ |
| 643 | int |
| 644 | quotactl(struct quotactl_args *uap) |
| 645 | { |
| 646 | struct nlookupdata nd; |
| 647 | struct thread *td; |
| 648 | struct proc *p; |
| 649 | struct mount *mp; |
| 650 | int error; |
| 651 | |
| 652 | td = curthread; |
| 653 | p = td->td_proc; |
| 654 | if (p->p_ucred->cr_prison && !prison_quotas) |
| 655 | return (EPERM); |
| 656 | |
| 657 | error = nlookup_init(&nd, SCARG(uap, path), UIO_USERSPACE, NLC_FOLLOW); |
| 658 | if (error == 0) |
| 659 | error = nlookup(&nd); |
| 660 | if (error == 0) { |
| 661 | mp = nd.nl_ncp->nc_mount; |
| 662 | error = VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), |
| 663 | SCARG(uap, arg), nd.nl_td); |
| 664 | } |
| 665 | nlookup_done(&nd); |
| 666 | return (error); |
| 667 | } |
| 668 | |
| 669 | int |
| 670 | kern_statfs(struct nlookupdata *nd, struct statfs *buf) |
| 671 | { |
| 672 | struct thread *td = curthread; |
| 673 | struct mount *mp; |
| 674 | struct statfs *sp; |
| 675 | int error; |
| 676 | |
| 677 | if ((error = nlookup(nd)) != 0) |
| 678 | return (error); |
| 679 | mp = nd->nl_ncp->nc_mount; |
| 680 | sp = &mp->mnt_stat; |
| 681 | if ((error = VFS_STATFS(mp, sp, td)) != 0) |
| 682 | return (error); |
| 683 | sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; |
| 684 | bcopy(sp, buf, sizeof(*buf)); |
| 685 | /* Only root should have access to the fsid's. */ |
| 686 | if (suser(td)) |
| 687 | buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0; |
| 688 | return (0); |
| 689 | } |
| 690 | |
| 691 | /* |
| 692 | * statfs_args(char *path, struct statfs *buf) |
| 693 | * |
| 694 | * Get filesystem statistics. |
| 695 | */ |
| 696 | int |
| 697 | statfs(struct statfs_args *uap) |
| 698 | { |
| 699 | struct nlookupdata nd; |
| 700 | struct statfs buf; |
| 701 | int error; |
| 702 | |
| 703 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 704 | if (error == 0) |
| 705 | error = kern_statfs(&nd, &buf); |
| 706 | nlookup_done(&nd); |
| 707 | if (error == 0) |
| 708 | error = copyout(&buf, uap->buf, sizeof(*uap->buf)); |
| 709 | return (error); |
| 710 | } |
| 711 | |
| 712 | int |
| 713 | kern_fstatfs(int fd, struct statfs *buf) |
| 714 | { |
| 715 | struct thread *td = curthread; |
| 716 | struct proc *p = td->td_proc; |
| 717 | struct file *fp; |
| 718 | struct mount *mp; |
| 719 | struct statfs *sp; |
| 720 | int error; |
| 721 | |
| 722 | KKASSERT(p); |
| 723 | error = getvnode(p->p_fd, fd, &fp); |
| 724 | if (error) |
| 725 | return (error); |
| 726 | mp = ((struct vnode *)fp->f_data)->v_mount; |
| 727 | if (mp == NULL) |
| 728 | return (EBADF); |
| 729 | sp = &mp->mnt_stat; |
| 730 | error = VFS_STATFS(mp, sp, td); |
| 731 | if (error) |
| 732 | return (error); |
| 733 | sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; |
| 734 | bcopy(sp, buf, sizeof(*buf)); |
| 735 | /* Only root should have access to the fsid's. */ |
| 736 | if (suser(td)) |
| 737 | buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0; |
| 738 | return (0); |
| 739 | } |
| 740 | |
| 741 | /* |
| 742 | * fstatfs_args(int fd, struct statfs *buf) |
| 743 | * |
| 744 | * Get filesystem statistics. |
| 745 | */ |
| 746 | int |
| 747 | fstatfs(struct fstatfs_args *uap) |
| 748 | { |
| 749 | struct statfs buf; |
| 750 | int error; |
| 751 | |
| 752 | error = kern_fstatfs(uap->fd, &buf); |
| 753 | |
| 754 | if (error == 0) |
| 755 | error = copyout(&buf, uap->buf, sizeof(*uap->buf)); |
| 756 | return (error); |
| 757 | } |
| 758 | |
| 759 | /* |
| 760 | * getfsstat_args(struct statfs *buf, long bufsize, int flags) |
| 761 | * |
| 762 | * Get statistics on all filesystems. |
| 763 | */ |
| 764 | /* ARGSUSED */ |
| 765 | int |
| 766 | getfsstat(struct getfsstat_args *uap) |
| 767 | { |
| 768 | struct thread *td = curthread; |
| 769 | struct mount *mp, *nmp; |
| 770 | struct statfs *sp; |
| 771 | caddr_t sfsp; |
| 772 | lwkt_tokref ilock; |
| 773 | long count, maxcount, error; |
| 774 | |
| 775 | maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); |
| 776 | sfsp = (caddr_t)SCARG(uap, buf); |
| 777 | count = 0; |
| 778 | lwkt_gettoken(&ilock, &mountlist_token); |
| 779 | for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { |
| 780 | if (vfs_busy(mp, LK_NOWAIT, &ilock, td)) { |
| 781 | nmp = TAILQ_NEXT(mp, mnt_list); |
| 782 | continue; |
| 783 | } |
| 784 | if (sfsp && count < maxcount) { |
| 785 | sp = &mp->mnt_stat; |
| 786 | /* |
| 787 | * If MNT_NOWAIT or MNT_LAZY is specified, do not |
| 788 | * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY |
| 789 | * overrides MNT_WAIT. |
| 790 | */ |
| 791 | if (((SCARG(uap, flags) & (MNT_LAZY|MNT_NOWAIT)) == 0 || |
| 792 | (SCARG(uap, flags) & MNT_WAIT)) && |
| 793 | (error = VFS_STATFS(mp, sp, td))) { |
| 794 | lwkt_gettokref(&ilock); |
| 795 | nmp = TAILQ_NEXT(mp, mnt_list); |
| 796 | vfs_unbusy(mp, td); |
| 797 | continue; |
| 798 | } |
| 799 | sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; |
| 800 | error = copyout(sp, sfsp, sizeof(*sp)); |
| 801 | if (error) { |
| 802 | vfs_unbusy(mp, td); |
| 803 | return (error); |
| 804 | } |
| 805 | sfsp += sizeof(*sp); |
| 806 | } |
| 807 | count++; |
| 808 | lwkt_gettokref(&ilock); |
| 809 | nmp = TAILQ_NEXT(mp, mnt_list); |
| 810 | vfs_unbusy(mp, td); |
| 811 | } |
| 812 | lwkt_reltoken(&ilock); |
| 813 | if (sfsp && count > maxcount) |
| 814 | uap->sysmsg_result = maxcount; |
| 815 | else |
| 816 | uap->sysmsg_result = count; |
| 817 | return (0); |
| 818 | } |
| 819 | |
| 820 | /* |
| 821 | * fchdir_args(int fd) |
| 822 | * |
| 823 | * Change current working directory to a given file descriptor. |
| 824 | */ |
| 825 | /* ARGSUSED */ |
| 826 | int |
| 827 | fchdir(struct fchdir_args *uap) |
| 828 | { |
| 829 | struct thread *td = curthread; |
| 830 | struct proc *p = td->td_proc; |
| 831 | struct filedesc *fdp = p->p_fd; |
| 832 | struct vnode *vp, *ovp; |
| 833 | struct mount *mp; |
| 834 | struct file *fp; |
| 835 | struct namecache *ncp, *oncp; |
| 836 | struct namecache *nct; |
| 837 | int error; |
| 838 | |
| 839 | if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) |
| 840 | return (error); |
| 841 | vp = (struct vnode *)fp->f_data; |
| 842 | vref(vp); |
| 843 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); |
| 844 | if (vp->v_type != VDIR || fp->f_ncp == NULL) |
| 845 | error = ENOTDIR; |
| 846 | else |
| 847 | error = VOP_ACCESS(vp, VEXEC, p->p_ucred, td); |
| 848 | if (error) { |
| 849 | vput(vp); |
| 850 | return (error); |
| 851 | } |
| 852 | ncp = cache_hold(fp->f_ncp); |
| 853 | while (!error && (mp = vp->v_mountedhere) != NULL) { |
| 854 | error = nlookup_mp(mp, &nct); |
| 855 | if (error == 0) { |
| 856 | cache_unlock(nct); /* leave ref intact */ |
| 857 | vput(vp); |
| 858 | vp = nct->nc_vp; |
| 859 | error = vget(vp, LK_SHARED, td); |
| 860 | KKASSERT(error == 0); |
| 861 | cache_drop(ncp); |
| 862 | ncp = nct; |
| 863 | } |
| 864 | } |
| 865 | if (error == 0) { |
| 866 | ovp = fdp->fd_cdir; |
| 867 | oncp = fdp->fd_ncdir; |
| 868 | VOP_UNLOCK(vp, 0, td); /* leave ref intact */ |
| 869 | fdp->fd_cdir = vp; |
| 870 | fdp->fd_ncdir = ncp; |
| 871 | cache_drop(oncp); |
| 872 | vrele(ovp); |
| 873 | } else { |
| 874 | cache_drop(ncp); |
| 875 | vput(vp); |
| 876 | } |
| 877 | return (error); |
| 878 | } |
| 879 | |
| 880 | int |
| 881 | kern_chdir(struct nlookupdata *nd) |
| 882 | { |
| 883 | struct thread *td = curthread; |
| 884 | struct proc *p = td->td_proc; |
| 885 | struct filedesc *fdp = p->p_fd; |
| 886 | struct vnode *vp, *ovp; |
| 887 | struct namecache *oncp; |
| 888 | int error; |
| 889 | |
| 890 | if ((error = nlookup(nd)) != 0) |
| 891 | return (error); |
| 892 | if ((vp = nd->nl_ncp->nc_vp) == NULL) |
| 893 | return (ENOENT); |
| 894 | if ((error = vget(vp, LK_SHARED, td)) != 0) |
| 895 | return (error); |
| 896 | |
| 897 | error = checkvp_chdir(vp, td); |
| 898 | VOP_UNLOCK(vp, 0, td); |
| 899 | if (error == 0) { |
| 900 | ovp = fdp->fd_cdir; |
| 901 | oncp = fdp->fd_ncdir; |
| 902 | cache_unlock(nd->nl_ncp); /* leave reference intact */ |
| 903 | fdp->fd_ncdir = nd->nl_ncp; |
| 904 | fdp->fd_cdir = vp; |
| 905 | cache_drop(oncp); |
| 906 | vrele(ovp); |
| 907 | nd->nl_ncp = NULL; |
| 908 | } else { |
| 909 | vrele(vp); |
| 910 | } |
| 911 | return (error); |
| 912 | } |
| 913 | |
| 914 | /* |
| 915 | * chdir_args(char *path) |
| 916 | * |
| 917 | * Change current working directory (``.''). |
| 918 | */ |
| 919 | int |
| 920 | chdir(struct chdir_args *uap) |
| 921 | { |
| 922 | struct nlookupdata nd; |
| 923 | int error; |
| 924 | |
| 925 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 926 | if (error == 0) |
| 927 | error = kern_chdir(&nd); |
| 928 | nlookup_done(&nd); |
| 929 | return (error); |
| 930 | } |
| 931 | |
| 932 | /* |
| 933 | * Helper function for raised chroot(2) security function: Refuse if |
| 934 | * any filedescriptors are open directories. |
| 935 | */ |
| 936 | static int |
| 937 | chroot_refuse_vdir_fds(fdp) |
| 938 | struct filedesc *fdp; |
| 939 | { |
| 940 | struct vnode *vp; |
| 941 | struct file *fp; |
| 942 | int error; |
| 943 | int fd; |
| 944 | |
| 945 | for (fd = 0; fd < fdp->fd_nfiles ; fd++) { |
| 946 | error = getvnode(fdp, fd, &fp); |
| 947 | if (error) |
| 948 | continue; |
| 949 | vp = (struct vnode *)fp->f_data; |
| 950 | if (vp->v_type != VDIR) |
| 951 | continue; |
| 952 | return(EPERM); |
| 953 | } |
| 954 | return (0); |
| 955 | } |
| 956 | |
| 957 | /* |
| 958 | * This sysctl determines if we will allow a process to chroot(2) if it |
| 959 | * has a directory open: |
| 960 | * 0: disallowed for all processes. |
| 961 | * 1: allowed for processes that were not already chroot(2)'ed. |
| 962 | * 2: allowed for all processes. |
| 963 | */ |
| 964 | |
| 965 | static int chroot_allow_open_directories = 1; |
| 966 | |
| 967 | SYSCTL_INT(_kern, OID_AUTO, chroot_allow_open_directories, CTLFLAG_RW, |
| 968 | &chroot_allow_open_directories, 0, ""); |
| 969 | |
| 970 | /* |
| 971 | * chroot to the specified namecache entry. We obtain the vp from the |
| 972 | * namecache data. The passed ncp must be locked and referenced and will |
| 973 | * remain locked and referenced on return. |
| 974 | */ |
| 975 | static int |
| 976 | kern_chroot(struct nlookupdata *nd) |
| 977 | { |
| 978 | struct thread *td = curthread; |
| 979 | struct proc *p = td->td_proc; |
| 980 | struct filedesc *fdp = p->p_fd; |
| 981 | struct namecache *ncp; |
| 982 | struct vnode *vp; |
| 983 | int error; |
| 984 | |
| 985 | /* |
| 986 | * Only root can chroot |
| 987 | */ |
| 988 | if ((error = suser_cred(p->p_ucred, PRISON_ROOT)) != 0) |
| 989 | return (error); |
| 990 | |
| 991 | if ((error = nlookup(nd)) != 0) |
| 992 | return (error); |
| 993 | ncp = nd->nl_ncp; |
| 994 | |
| 995 | /* |
| 996 | * Disallow open directory descriptors (fchdir() breakouts). |
| 997 | */ |
| 998 | if (chroot_allow_open_directories == 0 || |
| 999 | (chroot_allow_open_directories == 1 && fdp->fd_rdir != rootvnode)) { |
| 1000 | if ((error = chroot_refuse_vdir_fds(fdp)) != 0) |
| 1001 | return (error); |
| 1002 | } |
| 1003 | if ((vp = ncp->nc_vp) == NULL) |
| 1004 | return (ENOENT); |
| 1005 | |
| 1006 | if ((error = vget(vp, LK_SHARED, td)) != 0) |
| 1007 | return (error); |
| 1008 | |
| 1009 | /* |
| 1010 | * Check the validity of vp as a directory to change to and |
| 1011 | * associate it with rdir/jdir. |
| 1012 | */ |
| 1013 | error = checkvp_chdir(vp, td); |
| 1014 | VOP_UNLOCK(vp, 0, td); /* leave reference intact */ |
| 1015 | if (error == 0) { |
| 1016 | vrele(fdp->fd_rdir); |
| 1017 | fdp->fd_rdir = vp; /* reference inherited by fd_rdir */ |
| 1018 | cache_drop(fdp->fd_nrdir); |
| 1019 | fdp->fd_nrdir = cache_hold(ncp); |
| 1020 | if (fdp->fd_jdir == NULL) { |
| 1021 | fdp->fd_jdir = vp; |
| 1022 | vref(fdp->fd_jdir); |
| 1023 | fdp->fd_njdir = cache_hold(ncp); |
| 1024 | } |
| 1025 | } else { |
| 1026 | vrele(vp); |
| 1027 | } |
| 1028 | return (error); |
| 1029 | } |
| 1030 | |
| 1031 | /* |
| 1032 | * chroot_args(char *path) |
| 1033 | * |
| 1034 | * Change notion of root (``/'') directory. |
| 1035 | */ |
| 1036 | /* ARGSUSED */ |
| 1037 | int |
| 1038 | chroot(struct chroot_args *uap) |
| 1039 | { |
| 1040 | struct thread *td = curthread; |
| 1041 | struct nlookupdata nd; |
| 1042 | int error; |
| 1043 | |
| 1044 | KKASSERT(td->td_proc); |
| 1045 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 1046 | if (error == 0) |
| 1047 | error = kern_chroot(&nd); |
| 1048 | nlookup_done(&nd); |
| 1049 | return (error); |
| 1050 | } |
| 1051 | |
| 1052 | /* |
| 1053 | * Common routine for chroot and chdir. Given a locked, referenced vnode, |
| 1054 | * determine whether it is legal to chdir to the vnode. The vnode's state |
| 1055 | * is not changed by this call. |
| 1056 | */ |
| 1057 | int |
| 1058 | checkvp_chdir(struct vnode *vp, struct thread *td) |
| 1059 | { |
| 1060 | int error; |
| 1061 | |
| 1062 | if (vp->v_type != VDIR) |
| 1063 | error = ENOTDIR; |
| 1064 | else |
| 1065 | error = VOP_ACCESS(vp, VEXEC, td->td_proc->p_ucred, td); |
| 1066 | return (error); |
| 1067 | } |
| 1068 | |
| 1069 | int |
| 1070 | kern_open(struct nlookupdata *nd, int oflags, int mode, int *res) |
| 1071 | { |
| 1072 | struct thread *td = curthread; |
| 1073 | struct proc *p = td->td_proc; |
| 1074 | struct filedesc *fdp = p->p_fd; |
| 1075 | int cmode, flags; |
| 1076 | struct file *nfp; |
| 1077 | struct file *fp; |
| 1078 | struct vnode *vp; |
| 1079 | int type, indx, error; |
| 1080 | struct flock lf; |
| 1081 | |
| 1082 | if ((oflags & O_ACCMODE) == O_ACCMODE) |
| 1083 | return (EINVAL); |
| 1084 | flags = FFLAGS(oflags); |
| 1085 | error = falloc(p, &nfp, NULL); |
| 1086 | if (error) |
| 1087 | return (error); |
| 1088 | fp = nfp; |
| 1089 | cmode = ((mode &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; |
| 1090 | |
| 1091 | /* |
| 1092 | * XXX p_dupfd is a real mess. It allows a device to return a |
| 1093 | * file descriptor to be duplicated rather then doing the open |
| 1094 | * itself. |
| 1095 | */ |
| 1096 | p->p_dupfd = -1; |
| 1097 | |
| 1098 | /* |
| 1099 | * Call vn_open() to do the lookup and assign the vnode to the |
| 1100 | * file pointer. vn_open() does not change the ref count on fp |
| 1101 | * and the vnode, on success, will be inherited by the file pointer |
| 1102 | * and unlocked. |
| 1103 | */ |
| 1104 | nd->nl_flags |= NLC_LOCKVP; |
| 1105 | error = vn_open(nd, fp, flags, cmode); |
| 1106 | nlookup_done(nd); |
| 1107 | if (error) { |
| 1108 | /* |
| 1109 | * handle special fdopen() case. bleh. dupfdopen() is |
| 1110 | * responsible for dropping the old contents of ofiles[indx] |
| 1111 | * if it succeeds. |
| 1112 | * |
| 1113 | * Note that if fsetfd() succeeds it will add a ref to fp |
| 1114 | * which represents the fd_ofiles[] assignment. We must still |
| 1115 | * drop our reference. |
| 1116 | */ |
| 1117 | if ((error == ENODEV || error == ENXIO) && p->p_dupfd >= 0) { |
| 1118 | if (fsetfd(p, fp, &indx) == 0) { |
| 1119 | error = dupfdopen(fdp, indx, p->p_dupfd, flags, error); |
| 1120 | if (error == 0) { |
| 1121 | *res = indx; |
| 1122 | fdrop(fp, td); /* our ref */ |
| 1123 | return (0); |
| 1124 | } |
| 1125 | if (fdp->fd_ofiles[indx] == fp) { |
| 1126 | fdp->fd_ofiles[indx] = NULL; |
| 1127 | fdrop(fp, td); /* fd_ofiles[] ref */ |
| 1128 | } |
| 1129 | } |
| 1130 | } |
| 1131 | fdrop(fp, td); /* our ref */ |
| 1132 | if (error == ERESTART) |
| 1133 | error = EINTR; |
| 1134 | return (error); |
| 1135 | } |
| 1136 | |
| 1137 | /* |
| 1138 | * ref the vnode for ourselves so it can't be ripped out from under |
| 1139 | * is. XXX need an ND flag to request that the vnode be returned |
| 1140 | * anyway. |
| 1141 | */ |
| 1142 | vp = (struct vnode *)fp->f_data; |
| 1143 | vref(vp); |
| 1144 | if ((error = fsetfd(p, fp, &indx)) != 0) { |
| 1145 | fdrop(fp, td); |
| 1146 | vrele(vp); |
| 1147 | return (error); |
| 1148 | } |
| 1149 | |
| 1150 | /* |
| 1151 | * If no error occurs the vp will have been assigned to the file |
| 1152 | * pointer. |
| 1153 | */ |
| 1154 | p->p_dupfd = 0; |
| 1155 | |
| 1156 | /* |
| 1157 | * There should be 2 references on the file, one from the descriptor |
| 1158 | * table, and one for us. |
| 1159 | * |
| 1160 | * Handle the case where someone closed the file (via its file |
| 1161 | * descriptor) while we were blocked. The end result should look |
| 1162 | * like opening the file succeeded but it was immediately closed. |
| 1163 | */ |
| 1164 | if (fp->f_count == 1) { |
| 1165 | KASSERT(fdp->fd_ofiles[indx] != fp, |
| 1166 | ("Open file descriptor lost all refs")); |
| 1167 | vrele(vp); |
| 1168 | fo_close(fp, td); |
| 1169 | fdrop(fp, td); |
| 1170 | *res = indx; |
| 1171 | return 0; |
| 1172 | } |
| 1173 | |
| 1174 | if (flags & (O_EXLOCK | O_SHLOCK)) { |
| 1175 | lf.l_whence = SEEK_SET; |
| 1176 | lf.l_start = 0; |
| 1177 | lf.l_len = 0; |
| 1178 | if (flags & O_EXLOCK) |
| 1179 | lf.l_type = F_WRLCK; |
| 1180 | else |
| 1181 | lf.l_type = F_RDLCK; |
| 1182 | type = F_FLOCK; |
| 1183 | if ((flags & FNONBLOCK) == 0) |
| 1184 | type |= F_WAIT; |
| 1185 | |
| 1186 | if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0) { |
| 1187 | /* |
| 1188 | * lock request failed. Normally close the descriptor |
| 1189 | * but handle the case where someone might have dup()d |
| 1190 | * it when we weren't looking. One reference is |
| 1191 | * owned by the descriptor array, the other by us. |
| 1192 | */ |
| 1193 | vrele(vp); |
| 1194 | if (fdp->fd_ofiles[indx] == fp) { |
| 1195 | fdp->fd_ofiles[indx] = NULL; |
| 1196 | fdrop(fp, td); |
| 1197 | } |
| 1198 | fdrop(fp, td); |
| 1199 | return (error); |
| 1200 | } |
| 1201 | fp->f_flag |= FHASLOCK; |
| 1202 | } |
| 1203 | /* assert that vn_open created a backing object if one is needed */ |
| 1204 | KASSERT(!vn_canvmio(vp) || VOP_GETVOBJECT(vp, NULL) == 0, |
| 1205 | ("open: vmio vnode has no backing object after vn_open")); |
| 1206 | |
| 1207 | vrele(vp); |
| 1208 | |
| 1209 | /* |
| 1210 | * release our private reference, leaving the one associated with the |
| 1211 | * descriptor table intact. |
| 1212 | */ |
| 1213 | fdrop(fp, td); |
| 1214 | *res = indx; |
| 1215 | return (0); |
| 1216 | } |
| 1217 | |
| 1218 | /* |
| 1219 | * open_args(char *path, int flags, int mode) |
| 1220 | * |
| 1221 | * Check permissions, allocate an open file structure, |
| 1222 | * and call the device open routine if any. |
| 1223 | */ |
| 1224 | int |
| 1225 | open(struct open_args *uap) |
| 1226 | { |
| 1227 | struct nlookupdata nd; |
| 1228 | int error; |
| 1229 | |
| 1230 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 1231 | if (error == 0) { |
| 1232 | error = kern_open(&nd, uap->flags, |
| 1233 | uap->mode, &uap->sysmsg_result); |
| 1234 | } |
| 1235 | nlookup_done(&nd); |
| 1236 | return (error); |
| 1237 | } |
| 1238 | |
| 1239 | int |
| 1240 | kern_mknod(struct nlookupdata *nd, int mode, int dev) |
| 1241 | { |
| 1242 | struct namecache *ncp; |
| 1243 | struct thread *td = curthread; |
| 1244 | struct proc *p = td->td_proc; |
| 1245 | struct vnode *vp; |
| 1246 | struct vattr vattr; |
| 1247 | int error; |
| 1248 | int whiteout = 0; |
| 1249 | |
| 1250 | KKASSERT(p); |
| 1251 | |
| 1252 | switch (mode & S_IFMT) { |
| 1253 | case S_IFCHR: |
| 1254 | case S_IFBLK: |
| 1255 | error = suser(td); |
| 1256 | break; |
| 1257 | default: |
| 1258 | error = suser_cred(p->p_ucred, PRISON_ROOT); |
| 1259 | break; |
| 1260 | } |
| 1261 | if (error) |
| 1262 | return (error); |
| 1263 | |
| 1264 | bwillwrite(); |
| 1265 | nd->nl_flags |= NLC_CREATE; |
| 1266 | if ((error = nlookup(nd)) != 0) |
| 1267 | return (error); |
| 1268 | ncp = nd->nl_ncp; |
| 1269 | if (ncp->nc_vp) |
| 1270 | return (EEXIST); |
| 1271 | |
| 1272 | VATTR_NULL(&vattr); |
| 1273 | vattr.va_mode = (mode & ALLPERMS) &~ p->p_fd->fd_cmask; |
| 1274 | vattr.va_rdev = dev; |
| 1275 | whiteout = 0; |
| 1276 | |
| 1277 | switch (mode & S_IFMT) { |
| 1278 | case S_IFMT: /* used by badsect to flag bad sectors */ |
| 1279 | vattr.va_type = VBAD; |
| 1280 | break; |
| 1281 | case S_IFCHR: |
| 1282 | vattr.va_type = VCHR; |
| 1283 | break; |
| 1284 | case S_IFBLK: |
| 1285 | vattr.va_type = VBLK; |
| 1286 | break; |
| 1287 | case S_IFWHT: |
| 1288 | whiteout = 1; |
| 1289 | break; |
| 1290 | default: |
| 1291 | error = EINVAL; |
| 1292 | break; |
| 1293 | } |
| 1294 | if (error == 0) { |
| 1295 | if (whiteout) { |
| 1296 | error = VOP_NWHITEOUT(ncp, nd->nl_cred, NAMEI_CREATE); |
| 1297 | } else { |
| 1298 | vp = NULL; |
| 1299 | error = VOP_NMKNOD(ncp, &vp, nd->nl_cred, &vattr); |
| 1300 | if (error == 0) |
| 1301 | vput(vp); |
| 1302 | } |
| 1303 | } |
| 1304 | return (error); |
| 1305 | } |
| 1306 | |
| 1307 | /* |
| 1308 | * mknod_args(char *path, int mode, int dev) |
| 1309 | * |
| 1310 | * Create a special file. |
| 1311 | */ |
| 1312 | int |
| 1313 | mknod(struct mknod_args *uap) |
| 1314 | { |
| 1315 | struct nlookupdata nd; |
| 1316 | int error; |
| 1317 | |
| 1318 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); |
| 1319 | if (error == 0) |
| 1320 | error = kern_mknod(&nd, uap->mode, uap->dev); |
| 1321 | nlookup_done(&nd); |
| 1322 | return (error); |
| 1323 | } |
| 1324 | |
| 1325 | int |
| 1326 | kern_mkfifo(struct nlookupdata *nd, int mode) |
| 1327 | { |
| 1328 | struct namecache *ncp; |
| 1329 | struct thread *td = curthread; |
| 1330 | struct proc *p = td->td_proc; |
| 1331 | struct vattr vattr; |
| 1332 | struct vnode *vp; |
| 1333 | int error; |
| 1334 | |
| 1335 | bwillwrite(); |
| 1336 | |
| 1337 | nd->nl_flags |= NLC_CREATE; |
| 1338 | if ((error = nlookup(nd)) != 0) |
| 1339 | return (error); |
| 1340 | ncp = nd->nl_ncp; |
| 1341 | if (ncp->nc_vp) |
| 1342 | return (EEXIST); |
| 1343 | |
| 1344 | VATTR_NULL(&vattr); |
| 1345 | vattr.va_type = VFIFO; |
| 1346 | vattr.va_mode = (mode & ALLPERMS) &~ p->p_fd->fd_cmask; |
| 1347 | vp = NULL; |
| 1348 | error = VOP_NMKNOD(ncp, &vp, nd->nl_cred, &vattr); |
| 1349 | if (error == 0) |
| 1350 | vput(vp); |
| 1351 | return (error); |
| 1352 | } |
| 1353 | |
| 1354 | /* |
| 1355 | * mkfifo_args(char *path, int mode) |
| 1356 | * |
| 1357 | * Create a named pipe. |
| 1358 | */ |
| 1359 | int |
| 1360 | mkfifo(struct mkfifo_args *uap) |
| 1361 | { |
| 1362 | struct nlookupdata nd; |
| 1363 | int error; |
| 1364 | |
| 1365 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); |
| 1366 | if (error == 0) |
| 1367 | error = kern_mkfifo(&nd, uap->mode); |
| 1368 | nlookup_done(&nd); |
| 1369 | return (error); |
| 1370 | } |
| 1371 | |
| 1372 | int |
| 1373 | kern_link(struct nlookupdata *nd, struct nlookupdata *linknd) |
| 1374 | { |
| 1375 | struct thread *td = curthread; |
| 1376 | struct vnode *vp; |
| 1377 | int error; |
| 1378 | |
| 1379 | /* |
| 1380 | * Lookup the source and obtained a locked vnode. |
| 1381 | * |
| 1382 | * XXX relookup on vget failure / race ? |
| 1383 | */ |
| 1384 | bwillwrite(); |
| 1385 | if ((error = nlookup(nd)) != 0) |
| 1386 | return (error); |
| 1387 | vp = nd->nl_ncp->nc_vp; |
| 1388 | KKASSERT(vp != NULL); |
| 1389 | if (vp->v_type == VDIR) |
| 1390 | return (EPERM); /* POSIX */ |
| 1391 | if ((error = vget(vp, LK_EXCLUSIVE, td)) != 0) |
| 1392 | return (error); |
| 1393 | |
| 1394 | /* |
| 1395 | * Unlock the source so we can lookup the target without deadlocking |
| 1396 | * (XXX vp is locked already, possible other deadlock?). The target |
| 1397 | * must not exist. |
| 1398 | */ |
| 1399 | KKASSERT(nd->nl_flags & NLC_NCPISLOCKED); |
| 1400 | nd->nl_flags &= ~NLC_NCPISLOCKED; |
| 1401 | cache_unlock(nd->nl_ncp); |
| 1402 | |
| 1403 | linknd->nl_flags |= NLC_CREATE; |
| 1404 | if ((error = nlookup(linknd)) != 0) { |
| 1405 | vput(vp); |
| 1406 | return (error); |
| 1407 | } |
| 1408 | if (linknd->nl_ncp->nc_vp) { |
| 1409 | vput(vp); |
| 1410 | return (EEXIST); |
| 1411 | } |
| 1412 | |
| 1413 | /* |
| 1414 | * Finally run the new API VOP. |
| 1415 | */ |
| 1416 | error = VOP_NLINK(linknd->nl_ncp, vp, linknd->nl_cred); |
| 1417 | vput(vp); |
| 1418 | return (error); |
| 1419 | } |
| 1420 | |
| 1421 | /* |
| 1422 | * link_args(char *path, char *link) |
| 1423 | * |
| 1424 | * Make a hard file link. |
| 1425 | */ |
| 1426 | int |
| 1427 | link(struct link_args *uap) |
| 1428 | { |
| 1429 | struct nlookupdata nd, linknd; |
| 1430 | int error; |
| 1431 | |
| 1432 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 1433 | if (error == 0) { |
| 1434 | error = nlookup_init(&linknd, uap->link, UIO_USERSPACE, 0); |
| 1435 | if (error == 0) |
| 1436 | error = kern_link(&nd, &linknd); |
| 1437 | nlookup_done(&linknd); |
| 1438 | } |
| 1439 | nlookup_done(&nd); |
| 1440 | return (error); |
| 1441 | } |
| 1442 | |
| 1443 | int |
| 1444 | kern_symlink(struct nlookupdata *nd, char *path, int mode) |
| 1445 | { |
| 1446 | struct namecache *ncp; |
| 1447 | struct vattr vattr; |
| 1448 | struct vnode *vp; |
| 1449 | int error; |
| 1450 | |
| 1451 | bwillwrite(); |
| 1452 | nd->nl_flags |= NLC_CREATE; |
| 1453 | if ((error = nlookup(nd)) != 0) |
| 1454 | return (error); |
| 1455 | ncp = nd->nl_ncp; |
| 1456 | if (ncp->nc_vp) |
| 1457 | return (EEXIST); |
| 1458 | |
| 1459 | VATTR_NULL(&vattr); |
| 1460 | vattr.va_mode = mode; |
| 1461 | error = VOP_NSYMLINK(ncp, &vp, nd->nl_cred, &vattr, path); |
| 1462 | if (error == 0) |
| 1463 | vput(vp); |
| 1464 | return (error); |
| 1465 | } |
| 1466 | |
| 1467 | /* |
| 1468 | * symlink(char *path, char *link) |
| 1469 | * |
| 1470 | * Make a symbolic link. |
| 1471 | */ |
| 1472 | int |
| 1473 | symlink(struct symlink_args *uap) |
| 1474 | { |
| 1475 | struct thread *td = curthread; |
| 1476 | struct nlookupdata nd; |
| 1477 | char *path; |
| 1478 | int error; |
| 1479 | int mode; |
| 1480 | |
| 1481 | path = zalloc(namei_zone); |
| 1482 | error = copyinstr(uap->path, path, MAXPATHLEN, NULL); |
| 1483 | if (error == 0) { |
| 1484 | error = nlookup_init(&nd, uap->link, UIO_USERSPACE, 0); |
| 1485 | if (error == 0) { |
| 1486 | mode = ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask; |
| 1487 | error = kern_symlink(&nd, path, mode); |
| 1488 | } |
| 1489 | nlookup_done(&nd); |
| 1490 | } |
| 1491 | zfree(namei_zone, path); |
| 1492 | return (error); |
| 1493 | } |
| 1494 | |
| 1495 | /* |
| 1496 | * undelete_args(char *path) |
| 1497 | * |
| 1498 | * Delete a whiteout from the filesystem. |
| 1499 | */ |
| 1500 | /* ARGSUSED */ |
| 1501 | int |
| 1502 | undelete(struct undelete_args *uap) |
| 1503 | { |
| 1504 | struct nlookupdata nd; |
| 1505 | int error; |
| 1506 | |
| 1507 | error = nlookup_init(&nd, SCARG(uap, path), UIO_USERSPACE, 0); |
| 1508 | bwillwrite(); |
| 1509 | nd.nl_flags |= NLC_DELETE; |
| 1510 | if (error == 0) |
| 1511 | error = nlookup(&nd); |
| 1512 | if (error == 0) |
| 1513 | error = VOP_NWHITEOUT(nd.nl_ncp, nd.nl_cred, NAMEI_DELETE); |
| 1514 | nlookup_done(&nd); |
| 1515 | return (error); |
| 1516 | } |
| 1517 | |
| 1518 | int |
| 1519 | kern_unlink(struct nlookupdata *nd) |
| 1520 | { |
| 1521 | struct namecache *ncp; |
| 1522 | int error; |
| 1523 | |
| 1524 | bwillwrite(); |
| 1525 | nd->nl_flags |= NLC_DELETE; |
| 1526 | if ((error = nlookup(nd)) != 0) |
| 1527 | return (error); |
| 1528 | ncp = nd->nl_ncp; |
| 1529 | error = VOP_NREMOVE(ncp, nd->nl_cred); |
| 1530 | return (error); |
| 1531 | } |
| 1532 | |
| 1533 | /* |
| 1534 | * unlink_args(char *path) |
| 1535 | * |
| 1536 | * Delete a name from the filesystem. |
| 1537 | */ |
| 1538 | int |
| 1539 | unlink(struct unlink_args *uap) |
| 1540 | { |
| 1541 | struct nlookupdata nd; |
| 1542 | int error; |
| 1543 | |
| 1544 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); |
| 1545 | if (error == 0) |
| 1546 | error = kern_unlink(&nd); |
| 1547 | nlookup_done(&nd); |
| 1548 | return (error); |
| 1549 | } |
| 1550 | |
| 1551 | int |
| 1552 | kern_lseek(int fd, off_t offset, int whence, off_t *res) |
| 1553 | { |
| 1554 | struct thread *td = curthread; |
| 1555 | struct proc *p = td->td_proc; |
| 1556 | struct filedesc *fdp = p->p_fd; |
| 1557 | struct file *fp; |
| 1558 | struct vattr vattr; |
| 1559 | int error; |
| 1560 | |
| 1561 | if (fd >= fdp->fd_nfiles || |
| 1562 | (fp = fdp->fd_ofiles[fd]) == NULL) |
| 1563 | return (EBADF); |
| 1564 | if (fp->f_type != DTYPE_VNODE) |
| 1565 | return (ESPIPE); |
| 1566 | switch (whence) { |
| 1567 | case L_INCR: |
| 1568 | fp->f_offset += offset; |
| 1569 | break; |
| 1570 | case L_XTND: |
| 1571 | error=VOP_GETATTR((struct vnode *)fp->f_data, &vattr, td); |
| 1572 | if (error) |
| 1573 | return (error); |
| 1574 | fp->f_offset = offset + vattr.va_size; |
| 1575 | break; |
| 1576 | case L_SET: |
| 1577 | fp->f_offset = offset; |
| 1578 | break; |
| 1579 | default: |
| 1580 | return (EINVAL); |
| 1581 | } |
| 1582 | *res = fp->f_offset; |
| 1583 | return (0); |
| 1584 | } |
| 1585 | |
| 1586 | /* |
| 1587 | * lseek_args(int fd, int pad, off_t offset, int whence) |
| 1588 | * |
| 1589 | * Reposition read/write file offset. |
| 1590 | */ |
| 1591 | int |
| 1592 | lseek(struct lseek_args *uap) |
| 1593 | { |
| 1594 | int error; |
| 1595 | |
| 1596 | error = kern_lseek(uap->fd, uap->offset, uap->whence, |
| 1597 | &uap->sysmsg_offset); |
| 1598 | |
| 1599 | return (error); |
| 1600 | } |
| 1601 | |
| 1602 | int |
| 1603 | kern_access(struct nlookupdata *nd, int aflags) |
| 1604 | { |
| 1605 | struct thread *td = curthread; |
| 1606 | struct vnode *vp; |
| 1607 | int error, flags; |
| 1608 | |
| 1609 | if ((error = nlookup(nd)) != 0) |
| 1610 | return (error); |
| 1611 | error = cache_vget(nd->nl_ncp, nd->nl_cred, LK_EXCLUSIVE, &vp); |
| 1612 | if (error) |
| 1613 | return (error); |
| 1614 | |
| 1615 | /* Flags == 0 means only check for existence. */ |
| 1616 | if (aflags) { |
| 1617 | flags = 0; |
| 1618 | if (aflags & R_OK) |
| 1619 | flags |= VREAD; |
| 1620 | if (aflags & W_OK) |
| 1621 | flags |= VWRITE; |
| 1622 | if (aflags & X_OK) |
| 1623 | flags |= VEXEC; |
| 1624 | if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) |
| 1625 | error = VOP_ACCESS(vp, flags, nd->nl_cred, td); |
| 1626 | } |
| 1627 | vput(vp); |
| 1628 | return (error); |
| 1629 | } |
| 1630 | |
| 1631 | /* |
| 1632 | * access_args(char *path, int flags) |
| 1633 | * |
| 1634 | * Check access permissions. |
| 1635 | */ |
| 1636 | int |
| 1637 | access(struct access_args *uap) |
| 1638 | { |
| 1639 | struct nlookupdata nd; |
| 1640 | int error; |
| 1641 | |
| 1642 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 1643 | if (error == 0) |
| 1644 | error = kern_access(&nd, uap->flags); |
| 1645 | nlookup_done(&nd); |
| 1646 | return (error); |
| 1647 | } |
| 1648 | |
| 1649 | int |
| 1650 | kern_stat(struct nlookupdata *nd, struct stat *st) |
| 1651 | { |
| 1652 | int error; |
| 1653 | struct vnode *vp; |
| 1654 | thread_t td; |
| 1655 | |
| 1656 | if ((error = nlookup(nd)) != 0) |
| 1657 | return (error); |
| 1658 | if ((vp = nd->nl_ncp->nc_vp) == NULL) |
| 1659 | return (ENOENT); |
| 1660 | |
| 1661 | td = curthread; |
| 1662 | if ((error = vget(vp, LK_SHARED, td)) != 0) |
| 1663 | return (error); |
| 1664 | error = vn_stat(vp, st, td); |
| 1665 | vput(vp); |
| 1666 | return (error); |
| 1667 | } |
| 1668 | |
| 1669 | /* |
| 1670 | * stat_args(char *path, struct stat *ub) |
| 1671 | * |
| 1672 | * Get file status; this version follows links. |
| 1673 | */ |
| 1674 | int |
| 1675 | stat(struct stat_args *uap) |
| 1676 | { |
| 1677 | struct nlookupdata nd; |
| 1678 | struct stat st; |
| 1679 | int error; |
| 1680 | |
| 1681 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 1682 | if (error == 0) { |
| 1683 | error = kern_stat(&nd, &st); |
| 1684 | if (error == 0) |
| 1685 | error = copyout(&st, uap->ub, sizeof(*uap->ub)); |
| 1686 | } |
| 1687 | nlookup_done(&nd); |
| 1688 | return (error); |
| 1689 | } |
| 1690 | |
| 1691 | /* |
| 1692 | * lstat_args(char *path, struct stat *ub) |
| 1693 | * |
| 1694 | * Get file status; this version does not follow links. |
| 1695 | */ |
| 1696 | int |
| 1697 | lstat(struct lstat_args *uap) |
| 1698 | { |
| 1699 | struct nlookupdata nd; |
| 1700 | struct stat st; |
| 1701 | int error; |
| 1702 | |
| 1703 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); |
| 1704 | if (error == 0) { |
| 1705 | error = kern_stat(&nd, &st); |
| 1706 | if (error == 0) |
| 1707 | error = copyout(&st, uap->ub, sizeof(*uap->ub)); |
| 1708 | } |
| 1709 | nlookup_done(&nd); |
| 1710 | return (error); |
| 1711 | } |
| 1712 | |
| 1713 | void |
| 1714 | cvtnstat(sb, nsb) |
| 1715 | struct stat *sb; |
| 1716 | struct nstat *nsb; |
| 1717 | { |
| 1718 | nsb->st_dev = sb->st_dev; |
| 1719 | nsb->st_ino = sb->st_ino; |
| 1720 | nsb->st_mode = sb->st_mode; |
| 1721 | nsb->st_nlink = sb->st_nlink; |
| 1722 | nsb->st_uid = sb->st_uid; |
| 1723 | nsb->st_gid = sb->st_gid; |
| 1724 | nsb->st_rdev = sb->st_rdev; |
| 1725 | nsb->st_atimespec = sb->st_atimespec; |
| 1726 | nsb->st_mtimespec = sb->st_mtimespec; |
| 1727 | nsb->st_ctimespec = sb->st_ctimespec; |
| 1728 | nsb->st_size = sb->st_size; |
| 1729 | nsb->st_blocks = sb->st_blocks; |
| 1730 | nsb->st_blksize = sb->st_blksize; |
| 1731 | nsb->st_flags = sb->st_flags; |
| 1732 | nsb->st_gen = sb->st_gen; |
| 1733 | nsb->st_qspare[0] = sb->st_qspare[0]; |
| 1734 | nsb->st_qspare[1] = sb->st_qspare[1]; |
| 1735 | } |
| 1736 | |
| 1737 | /* |
| 1738 | * nstat_args(char *path, struct nstat *ub) |
| 1739 | */ |
| 1740 | /* ARGSUSED */ |
| 1741 | int |
| 1742 | nstat(struct nstat_args *uap) |
| 1743 | { |
| 1744 | struct thread *td = curthread; |
| 1745 | struct vnode *vp; |
| 1746 | struct stat sb; |
| 1747 | struct nstat nsb; |
| 1748 | struct nlookupdata nd; |
| 1749 | int error; |
| 1750 | |
| 1751 | vp = NULL; |
| 1752 | error = nlookup_init(&nd, SCARG(uap, path), UIO_USERSPACE, NLC_FOLLOW); |
| 1753 | if (error == 0) |
| 1754 | error = nlookup(&nd); |
| 1755 | if (error == 0) |
| 1756 | error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp); |
| 1757 | nlookup_done(&nd); |
| 1758 | if (error == 0) { |
| 1759 | error = vn_stat(vp, &sb, td); |
| 1760 | vput(vp); |
| 1761 | if (error == 0) { |
| 1762 | cvtnstat(&sb, &nsb); |
| 1763 | error = copyout(&nsb, SCARG(uap, ub), sizeof(nsb)); |
| 1764 | } |
| 1765 | } |
| 1766 | return (error); |
| 1767 | } |
| 1768 | |
| 1769 | /* |
| 1770 | * lstat_args(char *path, struct stat *ub) |
| 1771 | * |
| 1772 | * Get file status; this version does not follow links. |
| 1773 | */ |
| 1774 | /* ARGSUSED */ |
| 1775 | int |
| 1776 | nlstat(struct nlstat_args *uap) |
| 1777 | { |
| 1778 | struct thread *td = curthread; |
| 1779 | struct vnode *vp; |
| 1780 | struct stat sb; |
| 1781 | struct nstat nsb; |
| 1782 | struct nlookupdata nd; |
| 1783 | int error; |
| 1784 | |
| 1785 | vp = NULL; |
| 1786 | error = nlookup_init(&nd, SCARG(uap, path), UIO_USERSPACE, 0); |
| 1787 | if (error == 0) |
| 1788 | error = nlookup(&nd); |
| 1789 | if (error == 0) |
| 1790 | error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp); |
| 1791 | nlookup_done(&nd); |
| 1792 | if (error == 0) { |
| 1793 | error = vn_stat(vp, &sb, td); |
| 1794 | vput(vp); |
| 1795 | if (error == 0) { |
| 1796 | cvtnstat(&sb, &nsb); |
| 1797 | error = copyout(&nsb, SCARG(uap, ub), sizeof(nsb)); |
| 1798 | } |
| 1799 | } |
| 1800 | return (error); |
| 1801 | } |
| 1802 | |
| 1803 | /* |
| 1804 | * pathconf_Args(char *path, int name) |
| 1805 | * |
| 1806 | * Get configurable pathname variables. |
| 1807 | */ |
| 1808 | /* ARGSUSED */ |
| 1809 | int |
| 1810 | pathconf(struct pathconf_args *uap) |
| 1811 | { |
| 1812 | struct nlookupdata nd; |
| 1813 | struct vnode *vp; |
| 1814 | int error; |
| 1815 | |
| 1816 | vp = NULL; |
| 1817 | error = nlookup_init(&nd, SCARG(uap, path), UIO_USERSPACE, NLC_FOLLOW); |
| 1818 | if (error == 0) |
| 1819 | error = nlookup(&nd); |
| 1820 | if (error == 0) |
| 1821 | error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp); |
| 1822 | nlookup_done(&nd); |
| 1823 | if (error == 0) { |
| 1824 | error = VOP_PATHCONF(vp, SCARG(uap, name), uap->sysmsg_fds); |
| 1825 | vput(vp); |
| 1826 | } |
| 1827 | return (error); |
| 1828 | } |
| 1829 | |
| 1830 | /* |
| 1831 | * XXX: daver |
| 1832 | * kern_readlink isn't properly split yet. There is a copyin burried |
| 1833 | * in VOP_READLINK(). |
| 1834 | */ |
| 1835 | int |
| 1836 | kern_readlink(struct nlookupdata *nd, char *buf, int count, int *res) |
| 1837 | { |
| 1838 | struct thread *td = curthread; |
| 1839 | struct proc *p = td->td_proc; |
| 1840 | struct vnode *vp; |
| 1841 | struct iovec aiov; |
| 1842 | struct uio auio; |
| 1843 | int error; |
| 1844 | |
| 1845 | if ((error = nlookup(nd)) != 0) |
| 1846 | return (error); |
| 1847 | error = cache_vget(nd->nl_ncp, nd->nl_cred, LK_EXCLUSIVE, &vp); |
| 1848 | if (error) |
| 1849 | return (error); |
| 1850 | if (vp->v_type != VLNK) { |
| 1851 | error = EINVAL; |
| 1852 | } else { |
| 1853 | aiov.iov_base = buf; |
| 1854 | aiov.iov_len = count; |
| 1855 | auio.uio_iov = &aiov; |
| 1856 | auio.uio_iovcnt = 1; |
| 1857 | auio.uio_offset = 0; |
| 1858 | auio.uio_rw = UIO_READ; |
| 1859 | auio.uio_segflg = UIO_USERSPACE; |
| 1860 | auio.uio_td = td; |
| 1861 | auio.uio_resid = count; |
| 1862 | error = VOP_READLINK(vp, &auio, p->p_ucred); |
| 1863 | } |
| 1864 | vput(vp); |
| 1865 | *res = count - auio.uio_resid; |
| 1866 | return (error); |
| 1867 | } |
| 1868 | |
| 1869 | /* |
| 1870 | * readlink_args(char *path, char *buf, int count) |
| 1871 | * |
| 1872 | * Return target name of a symbolic link. |
| 1873 | */ |
| 1874 | int |
| 1875 | readlink(struct readlink_args *uap) |
| 1876 | { |
| 1877 | struct nlookupdata nd; |
| 1878 | int error; |
| 1879 | |
| 1880 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); |
| 1881 | if (error == 0) { |
| 1882 | error = kern_readlink(&nd, uap->buf, uap->count, |
| 1883 | &uap->sysmsg_result); |
| 1884 | } |
| 1885 | nlookup_done(&nd); |
| 1886 | return (error); |
| 1887 | } |
| 1888 | |
| 1889 | static int |
| 1890 | setfflags(struct vnode *vp, int flags) |
| 1891 | { |
| 1892 | struct thread *td = curthread; |
| 1893 | struct proc *p = td->td_proc; |
| 1894 | int error; |
| 1895 | struct vattr vattr; |
| 1896 | |
| 1897 | /* |
| 1898 | * Prevent non-root users from setting flags on devices. When |
| 1899 | * a device is reused, users can retain ownership of the device |
| 1900 | * if they are allowed to set flags and programs assume that |
| 1901 | * chown can't fail when done as root. |
| 1902 | */ |
| 1903 | if ((vp->v_type == VCHR || vp->v_type == VBLK) && |
| 1904 | ((error = suser_cred(p->p_ucred, PRISON_ROOT)) != 0)) |
| 1905 | return (error); |
| 1906 | |
| 1907 | VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE); |
| 1908 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); |
| 1909 | VATTR_NULL(&vattr); |
| 1910 | vattr.va_flags = flags; |
| 1911 | error = VOP_SETATTR(vp, &vattr, p->p_ucred, td); |
| 1912 | VOP_UNLOCK(vp, 0, td); |
| 1913 | return (error); |
| 1914 | } |
| 1915 | |
| 1916 | /* |
| 1917 | * chflags(char *path, int flags) |
| 1918 | * |
| 1919 | * Change flags of a file given a path name. |
| 1920 | */ |
| 1921 | /* ARGSUSED */ |
| 1922 | int |
| 1923 | chflags(struct chflags_args *uap) |
| 1924 | { |
| 1925 | struct nlookupdata nd; |
| 1926 | struct vnode *vp; |
| 1927 | int error; |
| 1928 | |
| 1929 | vp = NULL; |
| 1930 | error = nlookup_init(&nd, SCARG(uap, path), UIO_USERSPACE, NLC_FOLLOW); |
| 1931 | /* XXX Add NLC flag indicating modifying operation? */ |
| 1932 | if (error == 0) |
| 1933 | error = nlookup(&nd); |
| 1934 | if (error == 0) |
| 1935 | error = cache_vref(nd.nl_ncp, nd.nl_cred, &vp); |
| 1936 | nlookup_done(&nd); |
| 1937 | if (error == 0) { |
| 1938 | error = setfflags(vp, SCARG(uap, flags)); |
| 1939 | vrele(vp); |
| 1940 | } |
| 1941 | return (error); |
| 1942 | } |
| 1943 | |
| 1944 | /* |
| 1945 | * fchflags_args(int fd, int flags) |
| 1946 | * |
| 1947 | * Change flags of a file given a file descriptor. |
| 1948 | */ |
| 1949 | /* ARGSUSED */ |
| 1950 | int |
| 1951 | fchflags(struct fchflags_args *uap) |
| 1952 | { |
| 1953 | struct thread *td = curthread; |
| 1954 | struct proc *p = td->td_proc; |
| 1955 | struct file *fp; |
| 1956 | int error; |
| 1957 | |
| 1958 | if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) |
| 1959 | return (error); |
| 1960 | return setfflags((struct vnode *) fp->f_data, SCARG(uap, flags)); |
| 1961 | } |
| 1962 | |
| 1963 | static int |
| 1964 | setfmode(struct vnode *vp, int mode) |
| 1965 | { |
| 1966 | struct thread *td = curthread; |
| 1967 | struct proc *p = td->td_proc; |
| 1968 | int error; |
| 1969 | struct vattr vattr; |
| 1970 | |
| 1971 | VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE); |
| 1972 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); |
| 1973 | VATTR_NULL(&vattr); |
| 1974 | vattr.va_mode = mode & ALLPERMS; |
| 1975 | error = VOP_SETATTR(vp, &vattr, p->p_ucred, td); |
| 1976 | VOP_UNLOCK(vp, 0, td); |
| 1977 | return error; |
| 1978 | } |
| 1979 | |
| 1980 | int |
| 1981 | kern_chmod(struct nlookupdata *nd, int mode) |
| 1982 | { |
| 1983 | struct vnode *vp; |
| 1984 | int error; |
| 1985 | |
| 1986 | /* XXX Add NLC flag indicating modifying operation? */ |
| 1987 | if ((error = nlookup(nd)) != 0) |
| 1988 | return (error); |
| 1989 | if ((error = cache_vref(nd->nl_ncp, nd->nl_cred, &vp)) != 0) |
| 1990 | return (error); |
| 1991 | error = setfmode(vp, mode); |
| 1992 | vrele(vp); |
| 1993 | return (error); |
| 1994 | } |
| 1995 | |
| 1996 | /* |
| 1997 | * chmod_args(char *path, int mode) |
| 1998 | * |
| 1999 | * Change mode of a file given path name. |
| 2000 | */ |
| 2001 | /* ARGSUSED */ |
| 2002 | int |
| 2003 | chmod(struct chmod_args *uap) |
| 2004 | { |
| 2005 | struct nlookupdata nd; |
| 2006 | int error; |
| 2007 | |
| 2008 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 2009 | if (error == 0) |
| 2010 | error = kern_chmod(&nd, uap->mode); |
| 2011 | nlookup_done(&nd); |
| 2012 | return (error); |
| 2013 | } |
| 2014 | |
| 2015 | /* |
| 2016 | * lchmod_args(char *path, int mode) |
| 2017 | * |
| 2018 | * Change mode of a file given path name (don't follow links.) |
| 2019 | */ |
| 2020 | /* ARGSUSED */ |
| 2021 | int |
| 2022 | lchmod(struct lchmod_args *uap) |
| 2023 | { |
| 2024 | struct nlookupdata nd; |
| 2025 | int error; |
| 2026 | |
| 2027 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); |
| 2028 | if (error == 0) |
| 2029 | error = kern_chmod(&nd, uap->mode); |
| 2030 | nlookup_done(&nd); |
| 2031 | return (error); |
| 2032 | } |
| 2033 | |
| 2034 | /* |
| 2035 | * fchmod_args(int fd, int mode) |
| 2036 | * |
| 2037 | * Change mode of a file given a file descriptor. |
| 2038 | */ |
| 2039 | /* ARGSUSED */ |
| 2040 | int |
| 2041 | fchmod(struct fchmod_args *uap) |
| 2042 | { |
| 2043 | struct thread *td = curthread; |
| 2044 | struct proc *p = td->td_proc; |
| 2045 | struct file *fp; |
| 2046 | int error; |
| 2047 | |
| 2048 | if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) |
| 2049 | return (error); |
| 2050 | return setfmode((struct vnode *)fp->f_data, SCARG(uap, mode)); |
| 2051 | } |
| 2052 | |
| 2053 | static int |
| 2054 | setfown(struct vnode *vp, uid_t uid, gid_t gid) |
| 2055 | { |
| 2056 | struct thread *td = curthread; |
| 2057 | struct proc *p = td->td_proc; |
| 2058 | int error; |
| 2059 | struct vattr vattr; |
| 2060 | |
| 2061 | VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE); |
| 2062 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); |
| 2063 | VATTR_NULL(&vattr); |
| 2064 | vattr.va_uid = uid; |
| 2065 | vattr.va_gid = gid; |
| 2066 | error = VOP_SETATTR(vp, &vattr, p->p_ucred, td); |
| 2067 | VOP_UNLOCK(vp, 0, td); |
| 2068 | return error; |
| 2069 | } |
| 2070 | |
| 2071 | int |
| 2072 | kern_chown(struct nlookupdata *nd, int uid, int gid) |
| 2073 | { |
| 2074 | struct vnode *vp; |
| 2075 | int error; |
| 2076 | |
| 2077 | /* XXX Add NLC flag indicating modifying operation? */ |
| 2078 | if ((error = nlookup(nd)) != 0) |
| 2079 | return (error); |
| 2080 | if ((error = cache_vref(nd->nl_ncp, nd->nl_cred, &vp)) != 0) |
| 2081 | return (error); |
| 2082 | error = setfown(vp, uid, gid); |
| 2083 | vrele(vp); |
| 2084 | return (error); |
| 2085 | } |
| 2086 | |
| 2087 | /* |
| 2088 | * chown(char *path, int uid, int gid) |
| 2089 | * |
| 2090 | * Set ownership given a path name. |
| 2091 | */ |
| 2092 | int |
| 2093 | chown(struct chown_args *uap) |
| 2094 | { |
| 2095 | struct nlookupdata nd; |
| 2096 | int error; |
| 2097 | |
| 2098 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 2099 | if (error == 0) |
| 2100 | error = kern_chown(&nd, uap->uid, uap->gid); |
| 2101 | nlookup_done(&nd); |
| 2102 | return (error); |
| 2103 | } |
| 2104 | |
| 2105 | /* |
| 2106 | * lchown_args(char *path, int uid, int gid) |
| 2107 | * |
| 2108 | * Set ownership given a path name, do not cross symlinks. |
| 2109 | */ |
| 2110 | int |
| 2111 | lchown(struct lchown_args *uap) |
| 2112 | { |
| 2113 | struct nlookupdata nd; |
| 2114 | int error; |
| 2115 | |
| 2116 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); |
| 2117 | if (error == 0) |
| 2118 | error = kern_chown(&nd, uap->uid, uap->gid); |
| 2119 | nlookup_done(&nd); |
| 2120 | return (error); |
| 2121 | } |
| 2122 | |
| 2123 | /* |
| 2124 | * fchown_args(int fd, int uid, int gid) |
| 2125 | * |
| 2126 | * Set ownership given a file descriptor. |
| 2127 | */ |
| 2128 | /* ARGSUSED */ |
| 2129 | int |
| 2130 | fchown(struct fchown_args *uap) |
| 2131 | { |
| 2132 | struct thread *td = curthread; |
| 2133 | struct proc *p = td->td_proc; |
| 2134 | struct file *fp; |
| 2135 | int error; |
| 2136 | |
| 2137 | if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) |
| 2138 | return (error); |
| 2139 | return setfown((struct vnode *)fp->f_data, |
| 2140 | SCARG(uap, uid), SCARG(uap, gid)); |
| 2141 | } |
| 2142 | |
| 2143 | static int |
| 2144 | getutimes(const struct timeval *tvp, struct timespec *tsp) |
| 2145 | { |
| 2146 | struct timeval tv[2]; |
| 2147 | |
| 2148 | if (tvp == NULL) { |
| 2149 | microtime(&tv[0]); |
| 2150 | TIMEVAL_TO_TIMESPEC(&tv[0], &tsp[0]); |
| 2151 | tsp[1] = tsp[0]; |
| 2152 | } else { |
| 2153 | TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]); |
| 2154 | TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]); |
| 2155 | } |
| 2156 | return 0; |
| 2157 | } |
| 2158 | |
| 2159 | static int |
| 2160 | setutimes(struct vnode *vp, const struct timespec *ts, int nullflag) |
| 2161 | { |
| 2162 | struct thread *td = curthread; |
| 2163 | struct proc *p = td->td_proc; |
| 2164 | int error; |
| 2165 | struct vattr vattr; |
| 2166 | |
| 2167 | VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE); |
| 2168 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); |
| 2169 | VATTR_NULL(&vattr); |
| 2170 | vattr.va_atime = ts[0]; |
| 2171 | vattr.va_mtime = ts[1]; |
| 2172 | if (nullflag) |
| 2173 | vattr.va_vaflags |= VA_UTIMES_NULL; |
| 2174 | error = VOP_SETATTR(vp, &vattr, p->p_ucred, td); |
| 2175 | VOP_UNLOCK(vp, 0, td); |
| 2176 | return error; |
| 2177 | } |
| 2178 | |
| 2179 | int |
| 2180 | kern_utimes(struct nlookupdata *nd, struct timeval *tptr) |
| 2181 | { |
| 2182 | struct timespec ts[2]; |
| 2183 | struct vnode *vp; |
| 2184 | int error; |
| 2185 | |
| 2186 | if ((error = getutimes(tptr, ts)) != 0) |
| 2187 | return (error); |
| 2188 | /* XXX Add NLC flag indicating modifying operation? */ |
| 2189 | if ((error = nlookup(nd)) != 0) |
| 2190 | return (error); |
| 2191 | if ((error = cache_vref(nd->nl_ncp, nd->nl_cred, &vp)) != 0) |
| 2192 | return (error); |
| 2193 | error = setutimes(vp, ts, tptr == NULL); |
| 2194 | vrele(vp); |
| 2195 | return (error); |
| 2196 | } |
| 2197 | |
| 2198 | /* |
| 2199 | * utimes_args(char *path, struct timeval *tptr) |
| 2200 | * |
| 2201 | * Set the access and modification times of a file. |
| 2202 | */ |
| 2203 | int |
| 2204 | utimes(struct utimes_args *uap) |
| 2205 | { |
| 2206 | struct timeval tv[2]; |
| 2207 | struct nlookupdata nd; |
| 2208 | int error; |
| 2209 | |
| 2210 | if (uap->tptr) { |
| 2211 | error = copyin(uap->tptr, tv, sizeof(tv)); |
| 2212 | if (error) |
| 2213 | return (error); |
| 2214 | } |
| 2215 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 2216 | if (error == 0) |
| 2217 | error = kern_utimes(&nd, uap->tptr ? tv : NULL); |
| 2218 | nlookup_done(&nd); |
| 2219 | return (error); |
| 2220 | } |
| 2221 | |
| 2222 | /* |
| 2223 | * lutimes_args(char *path, struct timeval *tptr) |
| 2224 | * |
| 2225 | * Set the access and modification times of a file. |
| 2226 | */ |
| 2227 | int |
| 2228 | lutimes(struct lutimes_args *uap) |
| 2229 | { |
| 2230 | struct timeval tv[2]; |
| 2231 | struct nlookupdata nd; |
| 2232 | int error; |
| 2233 | |
| 2234 | if (uap->tptr) { |
| 2235 | error = copyin(uap->tptr, tv, sizeof(tv)); |
| 2236 | if (error) |
| 2237 | return (error); |
| 2238 | } |
| 2239 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); |
| 2240 | if (error == 0) |
| 2241 | error = kern_utimes(&nd, uap->tptr ? tv : NULL); |
| 2242 | nlookup_done(&nd); |
| 2243 | return (error); |
| 2244 | } |
| 2245 | |
| 2246 | int |
| 2247 | kern_futimes(int fd, struct timeval *tptr) |
| 2248 | { |
| 2249 | struct thread *td = curthread; |
| 2250 | struct proc *p = td->td_proc; |
| 2251 | struct timespec ts[2]; |
| 2252 | struct file *fp; |
| 2253 | int error; |
| 2254 | |
| 2255 | error = getutimes(tptr, ts); |
| 2256 | if (error) |
| 2257 | return (error); |
| 2258 | error = getvnode(p->p_fd, fd, &fp); |
| 2259 | if (error) |
| 2260 | return (error); |
| 2261 | error = setutimes((struct vnode *)fp->f_data, ts, tptr == NULL); |
| 2262 | return (error); |
| 2263 | } |
| 2264 | |
| 2265 | /* |
| 2266 | * futimes_args(int fd, struct timeval *tptr) |
| 2267 | * |
| 2268 | * Set the access and modification times of a file. |
| 2269 | */ |
| 2270 | int |
| 2271 | futimes(struct futimes_args *uap) |
| 2272 | { |
| 2273 | struct timeval tv[2]; |
| 2274 | int error; |
| 2275 | |
| 2276 | if (uap->tptr) { |
| 2277 | error = copyin(uap->tptr, tv, sizeof(tv)); |
| 2278 | if (error) |
| 2279 | return (error); |
| 2280 | } |
| 2281 | |
| 2282 | error = kern_futimes(uap->fd, uap->tptr ? tv : NULL); |
| 2283 | |
| 2284 | return (error); |
| 2285 | } |
| 2286 | |
| 2287 | int |
| 2288 | kern_truncate(struct nlookupdata *nd, off_t length) |
| 2289 | { |
| 2290 | struct vnode *vp; |
| 2291 | struct vattr vattr; |
| 2292 | int error; |
| 2293 | |
| 2294 | if (length < 0) |
| 2295 | return(EINVAL); |
| 2296 | /* XXX Add NLC flag indicating modifying operation? */ |
| 2297 | if ((error = nlookup(nd)) != 0) |
| 2298 | return (error); |
| 2299 | if ((error = cache_vref(nd->nl_ncp, nd->nl_cred, &vp)) != 0) |
| 2300 | return (error); |
| 2301 | VOP_LEASE(vp, nd->nl_td, nd->nl_cred, LEASE_WRITE); |
| 2302 | if ((error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, nd->nl_td)) != 0) { |
| 2303 | vrele(vp); |
| 2304 | return (error); |
| 2305 | } |
| 2306 | if (vp->v_type == VDIR) { |
| 2307 | error = EISDIR; |
| 2308 | } else if ((error = vn_writechk(vp)) == 0 && |
| 2309 | (error = VOP_ACCESS(vp, VWRITE, nd->nl_cred, nd->nl_td)) == 0) { |
| 2310 | VATTR_NULL(&vattr); |
| 2311 | vattr.va_size = length; |
| 2312 | error = VOP_SETATTR(vp, &vattr, nd->nl_cred, nd->nl_td); |
| 2313 | } |
| 2314 | vput(vp); |
| 2315 | return (error); |
| 2316 | } |
| 2317 | |
| 2318 | /* |
| 2319 | * truncate(char *path, int pad, off_t length) |
| 2320 | * |
| 2321 | * Truncate a file given its path name. |
| 2322 | */ |
| 2323 | int |
| 2324 | truncate(struct truncate_args *uap) |
| 2325 | { |
| 2326 | struct nlookupdata nd; |
| 2327 | int error; |
| 2328 | |
| 2329 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 2330 | if (error == 0) |
| 2331 | error = kern_truncate(&nd, uap->length); |
| 2332 | nlookup_done(&nd); |
| 2333 | return error; |
| 2334 | } |
| 2335 | |
| 2336 | int |
| 2337 | kern_ftruncate(int fd, off_t length) |
| 2338 | { |
| 2339 | struct thread *td = curthread; |
| 2340 | struct proc *p = td->td_proc; |
| 2341 | struct vattr vattr; |
| 2342 | struct vnode *vp; |
| 2343 | struct file *fp; |
| 2344 | int error; |
| 2345 | |
| 2346 | if (length < 0) |
| 2347 | return(EINVAL); |
| 2348 | if ((error = getvnode(p->p_fd, fd, &fp)) != 0) |
| 2349 | return (error); |
| 2350 | if ((fp->f_flag & FWRITE) == 0) |
| 2351 | return (EINVAL); |
| 2352 | vp = (struct vnode *)fp->f_data; |
| 2353 | VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE); |
| 2354 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); |
| 2355 | if (vp->v_type == VDIR) |
| 2356 | error = EISDIR; |
| 2357 | else if ((error = vn_writechk(vp)) == 0) { |
| 2358 | VATTR_NULL(&vattr); |
| 2359 | vattr.va_size = length; |
| 2360 | error = VOP_SETATTR(vp, &vattr, fp->f_cred, td); |
| 2361 | } |
| 2362 | VOP_UNLOCK(vp, 0, td); |
| 2363 | return (error); |
| 2364 | } |
| 2365 | |
| 2366 | /* |
| 2367 | * ftruncate_args(int fd, int pad, off_t length) |
| 2368 | * |
| 2369 | * Truncate a file given a file descriptor. |
| 2370 | */ |
| 2371 | int |
| 2372 | ftruncate(struct ftruncate_args *uap) |
| 2373 | { |
| 2374 | int error; |
| 2375 | |
| 2376 | error = kern_ftruncate(uap->fd, uap->length); |
| 2377 | |
| 2378 | return (error); |
| 2379 | } |
| 2380 | |
| 2381 | /* |
| 2382 | * fsync(int fd) |
| 2383 | * |
| 2384 | * Sync an open file. |
| 2385 | */ |
| 2386 | /* ARGSUSED */ |
| 2387 | int |
| 2388 | fsync(struct fsync_args *uap) |
| 2389 | { |
| 2390 | struct thread *td = curthread; |
| 2391 | struct proc *p = td->td_proc; |
| 2392 | struct vnode *vp; |
| 2393 | struct file *fp; |
| 2394 | vm_object_t obj; |
| 2395 | int error; |
| 2396 | |
| 2397 | if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) |
| 2398 | return (error); |
| 2399 | vp = (struct vnode *)fp->f_data; |
| 2400 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); |
| 2401 | if (VOP_GETVOBJECT(vp, &obj) == 0) |
| 2402 | vm_object_page_clean(obj, 0, 0, 0); |
| 2403 | if ((error = VOP_FSYNC(vp, MNT_WAIT, td)) == 0 && |
| 2404 | vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP) && |
| 2405 | bioops.io_fsync) |
| 2406 | error = (*bioops.io_fsync)(vp); |
| 2407 | VOP_UNLOCK(vp, 0, td); |
| 2408 | return (error); |
| 2409 | } |
| 2410 | |
| 2411 | int |
| 2412 | kern_rename(struct nlookupdata *fromnd, struct nlookupdata *tond) |
| 2413 | { |
| 2414 | struct namecache *fncpd; |
| 2415 | struct namecache *tncpd; |
| 2416 | struct namecache *ncp; |
| 2417 | struct mount *mp; |
| 2418 | int error; |
| 2419 | |
| 2420 | bwillwrite(); |
| 2421 | if ((error = nlookup(fromnd)) != 0) |
| 2422 | return (error); |
| 2423 | if ((fncpd = fromnd->nl_ncp->nc_parent) == NULL) |
| 2424 | return (ENOENT); |
| 2425 | cache_hold(fncpd); |
| 2426 | |
| 2427 | /* |
| 2428 | * unlock the source ncp so we can lookup the target ncp without |
| 2429 | * deadlocking. The target may or may not exist so we do not check |
| 2430 | * for a target vp like kern_mkdir() and other creation functions do. |
| 2431 | * |
| 2432 | * The source and target directories are ref'd and rechecked after |
| 2433 | * everything is relocked to determine if the source or target file |
| 2434 | * has been renamed. |
| 2435 | */ |
| 2436 | KKASSERT(fromnd->nl_flags & NLC_NCPISLOCKED); |
| 2437 | fromnd->nl_flags &= ~NLC_NCPISLOCKED; |
| 2438 | cache_unlock(fromnd->nl_ncp); |
| 2439 | |
| 2440 | tond->nl_flags |= NLC_CREATE; |
| 2441 | if ((error = nlookup(tond)) != 0) { |
| 2442 | cache_drop(fncpd); |
| 2443 | return (error); |
| 2444 | } |
| 2445 | if ((tncpd = tond->nl_ncp->nc_parent) == NULL) { |
| 2446 | cache_drop(fncpd); |
| 2447 | return (ENOENT); |
| 2448 | } |
| 2449 | cache_hold(tncpd); |
| 2450 | |
| 2451 | /* |
| 2452 | * If the source and target are the same there is nothing to do |
| 2453 | */ |
| 2454 | if (fromnd->nl_ncp == tond->nl_ncp) { |
| 2455 | cache_drop(fncpd); |
| 2456 | cache_drop(tncpd); |
| 2457 | return (0); |
| 2458 | } |
| 2459 | |
| 2460 | /* |
| 2461 | * relock the source ncp |
| 2462 | */ |
| 2463 | if (cache_lock_nonblock(fromnd->nl_ncp) == 0) { |
| 2464 | cache_resolve(fromnd->nl_ncp, fromnd->nl_cred); |
| 2465 | } else if (fromnd->nl_ncp > tond->nl_ncp) { |
| 2466 | cache_lock(fromnd->nl_ncp); |
| 2467 | cache_resolve(fromnd->nl_ncp, fromnd->nl_cred); |
| 2468 | } else { |
| 2469 | cache_unlock(tond->nl_ncp); |
| 2470 | cache_lock(fromnd->nl_ncp); |
| 2471 | cache_resolve(fromnd->nl_ncp, fromnd->nl_cred); |
| 2472 | cache_lock(tond->nl_ncp); |
| 2473 | cache_resolve(tond->nl_ncp, tond->nl_cred); |
| 2474 | } |
| 2475 | fromnd->nl_flags |= NLC_NCPISLOCKED; |
| 2476 | |
| 2477 | /* |
| 2478 | * make sure the parent directories linkages are the same |
| 2479 | */ |
| 2480 | if (fncpd != fromnd->nl_ncp->nc_parent || |
| 2481 | tncpd != tond->nl_ncp->nc_parent) { |
| 2482 | cache_drop(fncpd); |
| 2483 | cache_drop(tncpd); |
| 2484 | return (ENOENT); |
| 2485 | } |
| 2486 | |
| 2487 | /* |
| 2488 | * Both the source and target must be within the same filesystem and |
| 2489 | * in the same filesystem as their parent directories within the |
| 2490 | * namecache topology. |
| 2491 | */ |
| 2492 | mp = fncpd->nc_mount; |
| 2493 | if (mp != tncpd->nc_mount || mp != fromnd->nl_ncp->nc_mount || |
| 2494 | mp != tond->nl_ncp->nc_mount) { |
| 2495 | cache_drop(fncpd); |
| 2496 | cache_drop(tncpd); |
| 2497 | return (EXDEV); |
| 2498 | } |
| 2499 | |
| 2500 | /* |
| 2501 | * If the target exists and either the source or target is a directory, |
| 2502 | * then both must be directories. |
| 2503 | */ |
| 2504 | if (tond->nl_ncp->nc_vp) { |
| 2505 | if (fromnd->nl_ncp->nc_vp->v_type == VDIR) { |
| 2506 | if (tond->nl_ncp->nc_vp->v_type != VDIR) |
| 2507 | error = ENOTDIR; |
| 2508 | } else if (tond->nl_ncp->nc_vp->v_type == VDIR) { |
| 2509 | error = EISDIR; |
| 2510 | } |
| 2511 | } |
| 2512 | |
| 2513 | /* |
| 2514 | * You cannot rename a source into itself or a subdirectory of itself. |
| 2515 | * We check this by travsersing the target directory upwards looking |
| 2516 | * for a match against the source. |
| 2517 | */ |
| 2518 | if (error == 0) { |
| 2519 | for (ncp = tncpd; ncp; ncp = ncp->nc_parent) { |
| 2520 | if (fromnd->nl_ncp == ncp) { |
| 2521 | error = EINVAL; |
| 2522 | break; |
| 2523 | } |
| 2524 | } |
| 2525 | } |
| 2526 | |
| 2527 | cache_drop(fncpd); |
| 2528 | cache_drop(tncpd); |
| 2529 | if (error) |
| 2530 | return (error); |
| 2531 | error = VOP_NRENAME(fromnd->nl_ncp, tond->nl_ncp, tond->nl_cred); |
| 2532 | return (error); |
| 2533 | } |
| 2534 | |
| 2535 | /* |
| 2536 | * rename_args(char *from, char *to) |
| 2537 | * |
| 2538 | * Rename files. Source and destination must either both be directories, |
| 2539 | * or both not be directories. If target is a directory, it must be empty. |
| 2540 | */ |
| 2541 | int |
| 2542 | rename(struct rename_args *uap) |
| 2543 | { |
| 2544 | struct nlookupdata fromnd, tond; |
| 2545 | int error; |
| 2546 | |
| 2547 | error = nlookup_init(&fromnd, uap->from, UIO_USERSPACE, 0); |
| 2548 | if (error == 0) { |
| 2549 | error = nlookup_init(&tond, uap->to, UIO_USERSPACE, 0); |
| 2550 | if (error == 0) |
| 2551 | error = kern_rename(&fromnd, &tond); |
| 2552 | nlookup_done(&tond); |
| 2553 | } |
| 2554 | nlookup_done(&fromnd); |
| 2555 | return (error); |
| 2556 | } |
| 2557 | |
| 2558 | int |
| 2559 | kern_mkdir(struct nlookupdata *nd, int mode) |
| 2560 | { |
| 2561 | struct thread *td = curthread; |
| 2562 | struct proc *p = td->td_proc; |
| 2563 | struct namecache *ncp; |
| 2564 | struct vnode *vp; |
| 2565 | struct vattr vattr; |
| 2566 | int error; |
| 2567 | |
| 2568 | bwillwrite(); |
| 2569 | nd->nl_flags |= NLC_WILLBEDIR | NLC_CREATE; |
| 2570 | if ((error = nlookup(nd)) != 0) |
| 2571 | return (error); |
| 2572 | |
| 2573 | ncp = nd->nl_ncp; |
| 2574 | if (ncp->nc_vp) |
| 2575 | return (EEXIST); |
| 2576 | |
| 2577 | VATTR_NULL(&vattr); |
| 2578 | vattr.va_type = VDIR; |
| 2579 | vattr.va_mode = (mode & ACCESSPERMS) &~ p->p_fd->fd_cmask; |
| 2580 | |
| 2581 | vp = NULL; |
| 2582 | error = VOP_NMKDIR(ncp, &vp, p->p_ucred, &vattr); |
| 2583 | if (error == 0) |
| 2584 | vput(vp); |
| 2585 | return (error); |
| 2586 | } |
| 2587 | |
| 2588 | /* |
| 2589 | * mkdir_args(char *path, int mode) |
| 2590 | * |
| 2591 | * Make a directory file. |
| 2592 | */ |
| 2593 | /* ARGSUSED */ |
| 2594 | int |
| 2595 | mkdir(struct mkdir_args *uap) |
| 2596 | { |
| 2597 | struct nlookupdata nd; |
| 2598 | int error; |
| 2599 | |
| 2600 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); |
| 2601 | if (error == 0) |
| 2602 | error = kern_mkdir(&nd, uap->mode); |
| 2603 | nlookup_done(&nd); |
| 2604 | return (error); |
| 2605 | } |
| 2606 | |
| 2607 | int |
| 2608 | kern_rmdir(struct nlookupdata *nd) |
| 2609 | { |
| 2610 | struct namecache *ncp; |
| 2611 | int error; |
| 2612 | |
| 2613 | bwillwrite(); |
| 2614 | nd->nl_flags |= NLC_DELETE; |
| 2615 | if ((error = nlookup(nd)) != 0) |
| 2616 | return (error); |
| 2617 | |
| 2618 | ncp = nd->nl_ncp; |
| 2619 | error = VOP_NRMDIR(ncp, nd->nl_cred); |
| 2620 | return (error); |
| 2621 | } |
| 2622 | |
| 2623 | /* |
| 2624 | * rmdir_args(char *path) |
| 2625 | * |
| 2626 | * Remove a directory file. |
| 2627 | */ |
| 2628 | /* ARGSUSED */ |
| 2629 | int |
| 2630 | rmdir(struct rmdir_args *uap) |
| 2631 | { |
| 2632 | struct nlookupdata nd; |
| 2633 | int error; |
| 2634 | |
| 2635 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); |
| 2636 | if (error == 0) |
| 2637 | error = kern_rmdir(&nd); |
| 2638 | nlookup_done(&nd); |
| 2639 | return (error); |
| 2640 | } |
| 2641 | |
| 2642 | int |
| 2643 | kern_getdirentries(int fd, char *buf, u_int count, long *basep, int *res) |
| 2644 | { |
| 2645 | struct thread *td = curthread; |
| 2646 | struct proc *p = td->td_proc; |
| 2647 | struct vnode *vp; |
| 2648 | struct file *fp; |
| 2649 | struct uio auio; |
| 2650 | struct iovec aiov; |
| 2651 | long loff; |
| 2652 | int error, eofflag; |
| 2653 | |
| 2654 | if ((error = getvnode(p->p_fd, fd, &fp)) != 0) |
| 2655 | return (error); |
| 2656 | if ((fp->f_flag & FREAD) == 0) |
| 2657 | return (EBADF); |
| 2658 | vp = (struct vnode *)fp->f_data; |
| 2659 | unionread: |
| 2660 | if (vp->v_type != VDIR) |
| 2661 | return (EINVAL); |
| 2662 | aiov.iov_base = buf; |
| 2663 | aiov.iov_len = count; |
| 2664 | auio.uio_iov = &aiov; |
| 2665 | auio.uio_iovcnt = 1; |
| 2666 | auio.uio_rw = UIO_READ; |
| 2667 | auio.uio_segflg = UIO_USERSPACE; |
| 2668 | auio.uio_td = td; |
| 2669 | auio.uio_resid = count; |
| 2670 | /* vn_lock(vp, LK_SHARED | LK_RETRY, td); */ |
| 2671 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); |
| 2672 | loff = auio.uio_offset = fp->f_offset; |
| 2673 | error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, NULL); |
| 2674 | fp->f_offset = auio.uio_offset; |
| 2675 | VOP_UNLOCK(vp, 0, td); |
| 2676 | if (error) |
| 2677 | return (error); |
| 2678 | if (count == auio.uio_resid) { |
| 2679 | if (union_dircheckp) { |
| 2680 | error = union_dircheckp(td, &vp, fp); |
| 2681 | if (error == -1) |
| 2682 | goto unionread; |
| 2683 | if (error) |
| 2684 | return (error); |
| 2685 | } |
| 2686 | if ((vp->v_flag & VROOT) && |
| 2687 | (vp->v_mount->mnt_flag & MNT_UNION)) { |
| 2688 | struct vnode *tvp = vp; |
| 2689 | vp = vp->v_mount->mnt_vnodecovered; |
| 2690 | vref(vp); |
| 2691 | fp->f_data = (caddr_t)vp; |
| 2692 | fp->f_offset = 0; |
| 2693 | vrele(tvp); |
| 2694 | goto unionread; |
| 2695 | } |
| 2696 | } |
| 2697 | if (basep) { |
| 2698 | *basep = loff; |
| 2699 | } |
| 2700 | *res = count - auio.uio_resid; |
| 2701 | return (error); |
| 2702 | } |
| 2703 | |
| 2704 | /* |
| 2705 | * getdirentries_args(int fd, char *buf, u_int conut, long *basep) |
| 2706 | * |
| 2707 | * Read a block of directory entries in a file system independent format. |
| 2708 | */ |
| 2709 | int |
| 2710 | getdirentries(struct getdirentries_args *uap) |
| 2711 | { |
| 2712 | long base; |
| 2713 | int error; |
| 2714 | |
| 2715 | error = kern_getdirentries(uap->fd, uap->buf, uap->count, &base, |
| 2716 | &uap->sysmsg_result); |
| 2717 | |
| 2718 | if (error == 0) |
| 2719 | error = copyout(&base, uap->basep, sizeof(*uap->basep)); |
| 2720 | return (error); |
| 2721 | } |
| 2722 | |
| 2723 | /* |
| 2724 | * getdents_args(int fd, char *buf, size_t count) |
| 2725 | */ |
| 2726 | int |
| 2727 | getdents(struct getdents_args *uap) |
| 2728 | { |
| 2729 | int error; |
| 2730 | |
| 2731 | error = kern_getdirentries(uap->fd, uap->buf, uap->count, NULL, |
| 2732 | &uap->sysmsg_result); |
| 2733 | |
| 2734 | return (error); |
| 2735 | } |
| 2736 | |
| 2737 | /* |
| 2738 | * umask(int newmask) |
| 2739 | * |
| 2740 | * Set the mode mask for creation of filesystem nodes. |
| 2741 | * |
| 2742 | * MP SAFE |
| 2743 | */ |
| 2744 | int |
| 2745 | umask(struct umask_args *uap) |
| 2746 | { |
| 2747 | struct thread *td = curthread; |
| 2748 | struct proc *p = td->td_proc; |
| 2749 | struct filedesc *fdp; |
| 2750 | |
| 2751 | fdp = p->p_fd; |
| 2752 | uap->sysmsg_result = fdp->fd_cmask; |
| 2753 | fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS; |
| 2754 | return (0); |
| 2755 | } |
| 2756 | |
| 2757 | /* |
| 2758 | * revoke(char *path) |
| 2759 | * |
| 2760 | * Void all references to file by ripping underlying filesystem |
| 2761 | * away from vnode. |
| 2762 | */ |
| 2763 | /* ARGSUSED */ |
| 2764 | int |
| 2765 | revoke(struct revoke_args *uap) |
| 2766 | { |
| 2767 | struct thread *td = curthread; |
| 2768 | struct nlookupdata nd; |
| 2769 | struct vattr vattr; |
| 2770 | struct vnode *vp; |
| 2771 | struct ucred *cred; |
| 2772 | int error; |
| 2773 | |
| 2774 | vp = NULL; |
| 2775 | error = nlookup_init(&nd, SCARG(uap, path), UIO_USERSPACE, NLC_FOLLOW); |
| 2776 | if (error == 0) |
| 2777 | error = nlookup(&nd); |
| 2778 | if (error == 0) |
| 2779 | error = cache_vref(nd.nl_ncp, nd.nl_cred, &vp); |
| 2780 | cred = crhold(nd.nl_cred); |
| 2781 | nlookup_done(&nd); |
| 2782 | if (error == 0) { |
| 2783 | if (vp->v_type != VCHR && vp->v_type != VBLK) |
| 2784 | error = EINVAL; |
| 2785 | if (error == 0) |
| 2786 | error = VOP_GETATTR(vp, &vattr, td); |
| 2787 | if (error == 0 && cred->cr_uid != vattr.va_uid) |
| 2788 | error = suser_cred(cred, PRISON_ROOT); |
| 2789 | if (error == 0 && count_udev(vp->v_udev) > 0) { |
| 2790 | if ((error = vx_lock(vp)) == 0) { |
| 2791 | VOP_REVOKE(vp, REVOKEALL); |
| 2792 | vx_unlock(vp); |
| 2793 | } |
| 2794 | } |
| 2795 | vrele(vp); |
| 2796 | } |
| 2797 | crfree(cred); |
| 2798 | return (error); |
| 2799 | } |
| 2800 | |
| 2801 | /* |
| 2802 | * Convert a user file descriptor to a kernel file entry. |
| 2803 | */ |
| 2804 | int |
| 2805 | getvnode(struct filedesc *fdp, int fd, struct file **fpp) |
| 2806 | { |
| 2807 | struct file *fp; |
| 2808 | |
| 2809 | if ((u_int)fd >= fdp->fd_nfiles || |
| 2810 | (fp = fdp->fd_ofiles[fd]) == NULL) |
| 2811 | return (EBADF); |
| 2812 | if (fp->f_type != DTYPE_VNODE && fp->f_type != DTYPE_FIFO) |
| 2813 | return (EINVAL); |
| 2814 | *fpp = fp; |
| 2815 | return (0); |
| 2816 | } |
| 2817 | /* |
| 2818 | * getfh_args(char *fname, fhandle_t *fhp) |
| 2819 | * |
| 2820 | * Get (NFS) file handle |
| 2821 | */ |
| 2822 | int |
| 2823 | getfh(struct getfh_args *uap) |
| 2824 | { |
| 2825 | struct thread *td = curthread; |
| 2826 | struct nlookupdata nd; |
| 2827 | fhandle_t fh; |
| 2828 | struct vnode *vp; |
| 2829 | int error; |
| 2830 | |
| 2831 | /* |
| 2832 | * Must be super user |
| 2833 | */ |
| 2834 | if ((error = suser(td)) != 0) |
| 2835 | return (error); |
| 2836 | |
| 2837 | vp = NULL; |
| 2838 | error = nlookup_init(&nd, uap->fname, UIO_USERSPACE, NLC_FOLLOW); |
| 2839 | if (error == 0) |
| 2840 | error = nlookup(&nd); |
| 2841 | if (error == 0) |
| 2842 | error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp); |
| 2843 | nlookup_done(&nd); |
| 2844 | if (error == 0) { |
| 2845 | bzero(&fh, sizeof(fh)); |
| 2846 | fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; |
| 2847 | error = VFS_VPTOFH(vp, &fh.fh_fid); |
| 2848 | vput(vp); |
| 2849 | if (error == 0) |
| 2850 | error = copyout(&fh, uap->fhp, sizeof(fh)); |
| 2851 | } |
| 2852 | return (error); |
| 2853 | } |
| 2854 | |
| 2855 | /* |
| 2856 | * fhopen_args(const struct fhandle *u_fhp, int flags) |
| 2857 | * |
| 2858 | * syscall for the rpc.lockd to use to translate a NFS file handle into |
| 2859 | * an open descriptor. |
| 2860 | * |
| 2861 | * warning: do not remove the suser() call or this becomes one giant |
| 2862 | * security hole. |
| 2863 | */ |
| 2864 | int |
| 2865 | fhopen(struct fhopen_args *uap) |
| 2866 | { |
| 2867 | struct thread *td = curthread; |
| 2868 | struct proc *p = td->td_proc; |
| 2869 | struct mount *mp; |
| 2870 | struct vnode *vp; |
| 2871 | struct fhandle fhp; |
| 2872 | struct vattr vat; |
| 2873 | struct vattr *vap = &vat; |
| 2874 | struct flock lf; |
| 2875 | struct filedesc *fdp = p->p_fd; |
| 2876 | int fmode, mode, error, type; |
| 2877 | struct file *nfp; |
| 2878 | struct file *fp; |
| 2879 | int indx; |
| 2880 | |
| 2881 | /* |
| 2882 | * Must be super user |
| 2883 | */ |
| 2884 | error = suser(td); |
| 2885 | if (error) |
| 2886 | return (error); |
| 2887 | |
| 2888 | fmode = FFLAGS(SCARG(uap, flags)); |
| 2889 | /* why not allow a non-read/write open for our lockd? */ |
| 2890 | if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT)) |
| 2891 | return (EINVAL); |
| 2892 | error = copyin(SCARG(uap,u_fhp), &fhp, sizeof(fhp)); |
| 2893 | if (error) |
| 2894 | return(error); |
| 2895 | /* find the mount point */ |
| 2896 | mp = vfs_getvfs(&fhp.fh_fsid); |
| 2897 | if (mp == NULL) |
| 2898 | return (ESTALE); |
| 2899 | /* now give me my vnode, it gets returned to me locked */ |
| 2900 | error = VFS_FHTOVP(mp, &fhp.fh_fid, &vp); |
| 2901 | if (error) |
| 2902 | return (error); |
| 2903 | /* |
| 2904 | * from now on we have to make sure not |
| 2905 | * to forget about the vnode |
| 2906 | * any error that causes an abort must vput(vp) |
| 2907 | * just set error = err and 'goto bad;'. |
| 2908 | */ |
| 2909 | |
| 2910 | /* |
| 2911 | * from vn_open |
| 2912 | */ |
| 2913 | if (vp->v_type == VLNK) { |
| 2914 | error = EMLINK; |
| 2915 | goto bad; |
| 2916 | } |
| 2917 | if (vp->v_type == VSOCK) { |
| 2918 | error = EOPNOTSUPP; |
| 2919 | goto bad; |
| 2920 | } |
| 2921 | mode = 0; |
| 2922 | if (fmode & (FWRITE | O_TRUNC)) { |
| 2923 | if (vp->v_type == VDIR) { |
| 2924 | error = EISDIR; |
| 2925 | goto bad; |
| 2926 | } |
| 2927 | error = vn_writechk(vp); |
| 2928 | if (error) |
| 2929 | goto bad; |
| 2930 | mode |= VWRITE; |
| 2931 | } |
| 2932 | if (fmode & FREAD) |
| 2933 | mode |= VREAD; |
| 2934 | if (mode) { |
| 2935 | error = VOP_ACCESS(vp, mode, p->p_ucred, td); |
| 2936 | if (error) |
| 2937 | goto bad; |
| 2938 | } |
| 2939 | if (fmode & O_TRUNC) { |
| 2940 | VOP_UNLOCK(vp, 0, td); /* XXX */ |
| 2941 | VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE); |
| 2942 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); /* XXX */ |
| 2943 | VATTR_NULL(vap); |
| 2944 | vap->va_size = 0; |
| 2945 | error = VOP_SETATTR(vp, vap, p->p_ucred, td); |
| 2946 | if (error) |
| 2947 | goto bad; |
| 2948 | } |
| 2949 | |
| 2950 | /* |
| 2951 | * VOP_OPEN needs the file pointer so it can potentially override |
| 2952 | * it. |
| 2953 | * |
| 2954 | * WARNING! no f_ncp will be associated when fhopen()ing a directory. |
| 2955 | * XXX |
| 2956 | */ |
| 2957 | if ((error = falloc(p, &nfp, NULL)) != 0) |
| 2958 | goto bad; |
| 2959 | fp = nfp; |
| 2960 | |
| 2961 | fp->f_data = (caddr_t)vp; |
| 2962 | fp->f_flag = fmode & FMASK; |
| 2963 | fp->f_ops = &vnode_fileops; |
| 2964 | fp->f_type = DTYPE_VNODE; |
| 2965 | |
| 2966 | error = VOP_OPEN(vp, fmode, p->p_ucred, fp, td); |
| 2967 | if (error) { |
| 2968 | /* |
| 2969 | * setting f_ops this way prevents VOP_CLOSE from being |
| 2970 | * called or fdrop() releasing the vp from v_data. Since |
| 2971 | * the VOP_OPEN failed we don't want to VOP_CLOSE. |
| 2972 | */ |
| 2973 | fp->f_ops = &badfileops; |
| 2974 | fp->f_data = NULL; |
| 2975 | fdrop(fp, td); |
| 2976 | goto bad; |
| 2977 | } |
| 2978 | if (fmode & FWRITE) |
| 2979 | vp->v_writecount++; |
| 2980 | |
| 2981 | /* |
| 2982 | * The fp now owns a reference on the vnode. We still have our own |
| 2983 | * ref+lock. |
| 2984 | */ |
| 2985 | vref(vp); |
| 2986 | |
| 2987 | /* |
| 2988 | * Make sure that a VM object is created for VMIO support. If this |
| 2989 | * fails just fdrop() normally to clean up. |
| 2990 | */ |
| 2991 | if (vn_canvmio(vp) == TRUE) { |
| 2992 | if ((error = vfs_object_create(vp, td)) != 0) { |
| 2993 | fdrop(fp, td); |
| 2994 | goto bad; |
| 2995 | } |
| 2996 | } |
| 2997 | |
| 2998 | /* |
| 2999 | * The open was successful, associate it with a file descriptor. |
| 3000 | */ |
| 3001 | if ((error = fsetfd(p, fp, &indx)) != 0) { |
| 3002 | if (fmode & FWRITE) |
| 3003 | vp->v_writecount--; |
| 3004 | fdrop(fp, td); |
| 3005 | goto bad; |
| 3006 | } |
| 3007 | |
| 3008 | if (fmode & (O_EXLOCK | O_SHLOCK)) { |
| 3009 | lf.l_whence = SEEK_SET; |
| 3010 | lf.l_start = 0; |
| 3011 | lf.l_len = 0; |
| 3012 | if (fmode & O_EXLOCK) |
| 3013 | lf.l_type = F_WRLCK; |
| 3014 | else |
| 3015 | lf.l_type = F_RDLCK; |
| 3016 | type = F_FLOCK; |
| 3017 | if ((fmode & FNONBLOCK) == 0) |
| 3018 | type |= F_WAIT; |
| 3019 | VOP_UNLOCK(vp, 0, td); |
| 3020 | if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0) { |
| 3021 | /* |
| 3022 | * lock request failed. Normally close the descriptor |
| 3023 | * but handle the case where someone might have dup()d |
| 3024 | * or close()d it when we weren't looking. |
| 3025 | */ |
| 3026 | if (fdp->fd_ofiles[indx] == fp) { |
| 3027 | fdp->fd_ofiles[indx] = NULL; |
| 3028 | fdrop(fp, td); |
| 3029 | } |
| 3030 | |
| 3031 | /* |
| 3032 | * release our private reference. |
| 3033 | */ |
| 3034 | fdrop(fp, td); |
| 3035 | vrele(vp); |
| 3036 | return (error); |
| 3037 | } |
| 3038 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); |
| 3039 | fp->f_flag |= FHASLOCK; |
| 3040 | } |
| 3041 | if ((vp->v_type == VREG) && (VOP_GETVOBJECT(vp, NULL) != 0)) |
| 3042 | vfs_object_create(vp, td); |
| 3043 | |
| 3044 | vput(vp); |
| 3045 | fdrop(fp, td); |
| 3046 | uap->sysmsg_result = indx; |
| 3047 | return (0); |
| 3048 | |
| 3049 | bad: |
| 3050 | vput(vp); |
| 3051 | return (error); |
| 3052 | } |
| 3053 | |
| 3054 | /* |
| 3055 | * fhstat_args(struct fhandle *u_fhp, struct stat *sb) |
| 3056 | */ |
| 3057 | int |
| 3058 | fhstat(struct fhstat_args *uap) |
| 3059 | { |
| 3060 | struct thread *td = curthread; |
| 3061 | struct stat sb; |
| 3062 | fhandle_t fh; |
| 3063 | struct mount *mp; |
| 3064 | struct vnode *vp; |
| 3065 | int error; |
| 3066 | |
| 3067 | /* |
| 3068 | * Must be super user |
| 3069 | */ |
| 3070 | error = suser(td); |
| 3071 | if (error) |
| 3072 | return (error); |
| 3073 | |
| 3074 | error = copyin(SCARG(uap, u_fhp), &fh, sizeof(fhandle_t)); |
| 3075 | if (error) |
| 3076 | return (error); |
| 3077 | |
| 3078 | if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) |
| 3079 | return (ESTALE); |
| 3080 | if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) |
| 3081 | return (error); |
| 3082 | error = vn_stat(vp, &sb, td); |
| 3083 | vput(vp); |
| 3084 | if (error) |
| 3085 | return (error); |
| 3086 | error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); |
| 3087 | return (error); |
| 3088 | } |
| 3089 | |
| 3090 | /* |
| 3091 | * fhstatfs_args(struct fhandle *u_fhp, struct statfs *buf) |
| 3092 | */ |
| 3093 | int |
| 3094 | fhstatfs(struct fhstatfs_args *uap) |
| 3095 | { |
| 3096 | struct thread *td = curthread; |
| 3097 | struct statfs *sp; |
| 3098 | struct mount *mp; |
| 3099 | struct vnode *vp; |
| 3100 | struct statfs sb; |
| 3101 | fhandle_t fh; |
| 3102 | int error; |
| 3103 | |
| 3104 | /* |
| 3105 | * Must be super user |
| 3106 | */ |
| 3107 | if ((error = suser(td))) |
| 3108 | return (error); |
| 3109 | |
| 3110 | if ((error = copyin(SCARG(uap, u_fhp), &fh, sizeof(fhandle_t))) != 0) |
| 3111 | return (error); |
| 3112 | |
| 3113 | if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) |
| 3114 | return (ESTALE); |
| 3115 | if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) |
| 3116 | return (error); |
| 3117 | mp = vp->v_mount; |
| 3118 | sp = &mp->mnt_stat; |
| 3119 | vput(vp); |
| 3120 | if ((error = VFS_STATFS(mp, sp, td)) != 0) |
| 3121 | return (error); |
| 3122 | sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; |
| 3123 | if (suser(td)) { |
| 3124 | bcopy(sp, &sb, sizeof(sb)); |
| 3125 | sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0; |
| 3126 | sp = &sb; |
| 3127 | } |
| 3128 | return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); |
| 3129 | } |
| 3130 | |
| 3131 | /* |
| 3132 | * Syscall to push extended attribute configuration information into the |
| 3133 | * VFS. Accepts a path, which it converts to a mountpoint, as well as |
| 3134 | * a command (int cmd), and attribute name and misc data. For now, the |
| 3135 | * attribute name is left in userspace for consumption by the VFS_op. |
| 3136 | * It will probably be changed to be copied into sysspace by the |
| 3137 | * syscall in the future, once issues with various consumers of the |
| 3138 | * attribute code have raised their hands. |
| 3139 | * |
| 3140 | * Currently this is used only by UFS Extended Attributes. |
| 3141 | */ |
| 3142 | int |
| 3143 | extattrctl(struct extattrctl_args *uap) |
| 3144 | { |
| 3145 | struct nlookupdata nd; |
| 3146 | struct mount *mp; |
| 3147 | struct vnode *vp; |
| 3148 | int error; |
| 3149 | |
| 3150 | vp = NULL; |
| 3151 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 3152 | if (error == 0) |
| 3153 | error = nlookup(&nd); |
| 3154 | if (error == 0) { |
| 3155 | mp = nd.nl_ncp->nc_mount; |
| 3156 | error = VFS_EXTATTRCTL(mp, SCARG(uap, cmd), |
| 3157 | SCARG(uap, attrname), SCARG(uap, arg), |
| 3158 | nd.nl_td); |
| 3159 | } |
| 3160 | nlookup_done(&nd); |
| 3161 | return (error); |
| 3162 | } |
| 3163 | |
| 3164 | /* |
| 3165 | * Syscall to set a named extended attribute on a file or directory. |
| 3166 | * Accepts attribute name, and a uio structure pointing to the data to set. |
| 3167 | * The uio is consumed in the style of writev(). The real work happens |
| 3168 | * in VOP_SETEXTATTR(). |
| 3169 | */ |
| 3170 | int |
| 3171 | extattr_set_file(struct extattr_set_file_args *uap) |
| 3172 | { |
| 3173 | char attrname[EXTATTR_MAXNAMELEN]; |
| 3174 | struct iovec aiov[UIO_SMALLIOV]; |
| 3175 | struct iovec *needfree; |
| 3176 | struct nlookupdata nd; |
| 3177 | struct iovec *iov; |
| 3178 | struct vnode *vp; |
| 3179 | struct uio auio; |
| 3180 | u_int iovlen; |
| 3181 | u_int cnt; |
| 3182 | int error; |
| 3183 | int i; |
| 3184 | |
| 3185 | error = copyin(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN); |
| 3186 | if (error) |
| 3187 | return (error); |
| 3188 | |
| 3189 | vp = NULL; |
| 3190 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 3191 | if (error == 0) |
| 3192 | error = nlookup(&nd); |
| 3193 | if (error == 0) |
| 3194 | error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp); |
| 3195 | if (error) { |
| 3196 | nlookup_done(&nd); |
| 3197 | return (error); |
| 3198 | } |
| 3199 | |
| 3200 | needfree = NULL; |
| 3201 | iovlen = uap->iovcnt * sizeof(struct iovec); |
| 3202 | if (uap->iovcnt > UIO_SMALLIOV) { |
| 3203 | if (uap->iovcnt > UIO_MAXIOV) { |
| 3204 | error = EINVAL; |
| 3205 | goto done; |
| 3206 | } |
| 3207 | MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK); |
| 3208 | needfree = iov; |
| 3209 | } else { |
| 3210 | iov = aiov; |
| 3211 | } |
| 3212 | auio.uio_iov = iov; |
| 3213 | auio.uio_iovcnt = uap->iovcnt; |
| 3214 | auio.uio_rw = UIO_WRITE; |
| 3215 | auio.uio_segflg = UIO_USERSPACE; |
| 3216 | auio.uio_td = nd.nl_td; |
| 3217 | auio.uio_offset = 0; |
| 3218 | if ((error = copyin(uap->iovp, iov, iovlen))) |
| 3219 | goto done; |
| 3220 | auio.uio_resid = 0; |
| 3221 | for (i = 0; i < uap->iovcnt; i++) { |
| 3222 | if (iov->iov_len > INT_MAX - auio.uio_resid) { |
| 3223 | error = EINVAL; |
| 3224 | goto done; |
| 3225 | } |
| 3226 | auio.uio_resid += iov->iov_len; |
| 3227 | iov++; |
| 3228 | } |
| 3229 | cnt = auio.uio_resid; |
| 3230 | error = VOP_SETEXTATTR(vp, attrname, &auio, nd.nl_cred, nd.nl_td); |
| 3231 | cnt -= auio.uio_resid; |
| 3232 | uap->sysmsg_result = cnt; |
| 3233 | done: |
| 3234 | vput(vp); |
| 3235 | nlookup_done(&nd); |
| 3236 | if (needfree) |
| 3237 | FREE(needfree, M_IOV); |
| 3238 | return (error); |
| 3239 | } |
| 3240 | |
| 3241 | /* |
| 3242 | * Syscall to get a named extended attribute on a file or directory. |
| 3243 | * Accepts attribute name, and a uio structure pointing to a buffer for the |
| 3244 | * data. The uio is consumed in the style of readv(). The real work |
| 3245 | * happens in VOP_GETEXTATTR(); |
| 3246 | */ |
| 3247 | int |
| 3248 | extattr_get_file(struct extattr_get_file_args *uap) |
| 3249 | { |
| 3250 | char attrname[EXTATTR_MAXNAMELEN]; |
| 3251 | struct iovec aiov[UIO_SMALLIOV]; |
| 3252 | struct iovec *needfree; |
| 3253 | struct nlookupdata nd; |
| 3254 | struct iovec *iov; |
| 3255 | struct vnode *vp; |
| 3256 | struct uio auio; |
| 3257 | u_int iovlen; |
| 3258 | u_int cnt; |
| 3259 | int error; |
| 3260 | int i; |
| 3261 | |
| 3262 | error = copyin(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN); |
| 3263 | if (error) |
| 3264 | return (error); |
| 3265 | |
| 3266 | vp = NULL; |
| 3267 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 3268 | if (error == 0) |
| 3269 | error = nlookup(&nd); |
| 3270 | if (error == 0) |
| 3271 | error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp); |
| 3272 | if (error) { |
| 3273 | nlookup_done(&nd); |
| 3274 | return (error); |
| 3275 | } |
| 3276 | |
| 3277 | iovlen = uap->iovcnt * sizeof (struct iovec); |
| 3278 | needfree = NULL; |
| 3279 | if (uap->iovcnt > UIO_SMALLIOV) { |
| 3280 | if (uap->iovcnt > UIO_MAXIOV) { |
| 3281 | error = EINVAL; |
| 3282 | goto done; |
| 3283 | } |
| 3284 | MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK); |
| 3285 | needfree = iov; |
| 3286 | } else { |
| 3287 | iov = aiov; |
| 3288 | } |
| 3289 | auio.uio_iov = iov; |
| 3290 | auio.uio_iovcnt = uap->iovcnt; |
| 3291 | auio.uio_rw = UIO_READ; |
| 3292 | auio.uio_segflg = UIO_USERSPACE; |
| 3293 | auio.uio_td = nd.nl_td; |
| 3294 | auio.uio_offset = 0; |
| 3295 | if ((error = copyin(uap->iovp, iov, iovlen))) |
| 3296 | goto done; |
| 3297 | auio.uio_resid = 0; |
| 3298 | for (i = 0; i < uap->iovcnt; i++) { |
| 3299 | if (iov->iov_len > INT_MAX - auio.uio_resid) { |
| 3300 | error = EINVAL; |
| 3301 | goto done; |
| 3302 | } |
| 3303 | auio.uio_resid += iov->iov_len; |
| 3304 | iov++; |
| 3305 | } |
| 3306 | cnt = auio.uio_resid; |
| 3307 | error = VOP_GETEXTATTR(vp, attrname, &auio, nd.nl_cred, nd.nl_td); |
| 3308 | cnt -= auio.uio_resid; |
| 3309 | uap->sysmsg_result = cnt; |
| 3310 | done: |
| 3311 | vput(vp); |
| 3312 | nlookup_done(&nd); |
| 3313 | if (needfree) |
| 3314 | FREE(needfree, M_IOV); |
| 3315 | return(error); |
| 3316 | } |
| 3317 | |
| 3318 | /* |
| 3319 | * Syscall to delete a named extended attribute from a file or directory. |
| 3320 | * Accepts attribute name. The real work happens in VOP_SETEXTATTR(). |
| 3321 | */ |
| 3322 | int |
| 3323 | extattr_delete_file(struct extattr_delete_file_args *uap) |
| 3324 | { |
| 3325 | char attrname[EXTATTR_MAXNAMELEN]; |
| 3326 | struct nlookupdata nd; |
| 3327 | struct vnode *vp; |
| 3328 | int error; |
| 3329 | |
| 3330 | error = copyin(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN); |
| 3331 | if (error) |
| 3332 | return(error); |
| 3333 | |
| 3334 | vp = NULL; |
| 3335 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 3336 | if (error == 0) |
| 3337 | error = nlookup(&nd); |
| 3338 | if (error == 0) |
| 3339 | error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp); |
| 3340 | if (error) { |
| 3341 | nlookup_done(&nd); |
| 3342 | return (error); |
| 3343 | } |
| 3344 | |
| 3345 | error = VOP_SETEXTATTR(vp, attrname, NULL, nd.nl_cred, nd.nl_td); |
| 3346 | vput(vp); |
| 3347 | nlookup_done(&nd); |
| 3348 | return(error); |
| 3349 | } |
| 3350 | |
| 3351 | /* |
| 3352 | * print out statistics from the current status of the buffer pool |
| 3353 | * this can be toggeled by the system control option debug.syncprt |
| 3354 | */ |
| 3355 | #ifdef DEBUG |
| 3356 | void |
| 3357 | vfs_bufstats(void) |
| 3358 | { |
| 3359 | int s, i, j, count; |
| 3360 | struct buf *bp; |
| 3361 | struct bqueues *dp; |
| 3362 | int counts[(MAXBSIZE / PAGE_SIZE) + 1]; |
| 3363 | static char *bname[3] = { "LOCKED", "LRU", "AGE" }; |
| 3364 | |
| 3365 | for (dp = bufqueues, i = 0; dp < &bufqueues[3]; dp++, i++) { |
| 3366 | count = 0; |
| 3367 | for (j = 0; j <= MAXBSIZE/PAGE_SIZE; j++) |
| 3368 | counts[j] = 0; |
| 3369 | s = splbio(); |
| 3370 | TAILQ_FOREACH(bp, dp, b_freelist) { |
| 3371 | counts[bp->b_bufsize/PAGE_SIZE]++; |
| 3372 | count++; |
| 3373 | } |
| 3374 | splx(s); |
| 3375 | printf("%s: total-%d", bname[i], count); |
| 3376 | for (j = 0; j <= MAXBSIZE/PAGE_SIZE; j++) |
| 3377 | if (counts[j] != 0) |
| 3378 | printf(", %d-%d", j * PAGE_SIZE, counts[j]); |
| 3379 | printf("\n"); |
| 3380 | } |
| 3381 | } |
| 3382 | #endif |