| 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 1.32 2004/04/21 04:49:00 hmp Exp $ |
| 41 | */ |
| 42 | |
| 43 | #include <sys/param.h> |
| 44 | #include <sys/systm.h> |
| 45 | #include <sys/buf.h> |
| 46 | #include <sys/sysent.h> |
| 47 | #include <sys/malloc.h> |
| 48 | #include <sys/mount.h> |
| 49 | #include <sys/sysproto.h> |
| 50 | #include <sys/filedesc.h> |
| 51 | #include <sys/kernel.h> |
| 52 | #include <sys/fcntl.h> |
| 53 | #include <sys/file.h> |
| 54 | #include <sys/linker.h> |
| 55 | #include <sys/stat.h> |
| 56 | #include <sys/unistd.h> |
| 57 | #include <sys/vnode.h> |
| 58 | #include <sys/proc.h> |
| 59 | #include <sys/namei.h> |
| 60 | #include <sys/dirent.h> |
| 61 | #include <sys/extattr.h> |
| 62 | #include <sys/kern_syscall.h> |
| 63 | |
| 64 | #include <machine/limits.h> |
| 65 | #include <vfs/union/union.h> |
| 66 | #include <sys/sysctl.h> |
| 67 | #include <vm/vm.h> |
| 68 | #include <vm/vm_object.h> |
| 69 | #include <vm/vm_zone.h> |
| 70 | #include <vm/vm_page.h> |
| 71 | |
| 72 | #include <sys/file2.h> |
| 73 | |
| 74 | static int checkvp_chdir (struct vnode *vn, struct thread *td); |
| 75 | static void checkdirs (struct vnode *olddp); |
| 76 | static int chroot_refuse_vdir_fds (struct filedesc *fdp); |
| 77 | static int getutimes (const struct timeval *, struct timespec *); |
| 78 | static int setfown (struct vnode *, uid_t, gid_t); |
| 79 | static int setfmode (struct vnode *, int); |
| 80 | static int setfflags (struct vnode *, int); |
| 81 | static int setutimes (struct vnode *, const struct timespec *, int); |
| 82 | static int usermount = 0; /* if 1, non-root can mount fs. */ |
| 83 | |
| 84 | int (*union_dircheckp) (struct thread *, struct vnode **, struct file *); |
| 85 | |
| 86 | SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, ""); |
| 87 | |
| 88 | /* |
| 89 | * Virtual File System System Calls |
| 90 | */ |
| 91 | |
| 92 | /* |
| 93 | * Mount a file system. |
| 94 | */ |
| 95 | /* |
| 96 | * mount_args(char *type, char *path, int flags, caddr_t data) |
| 97 | */ |
| 98 | /* ARGSUSED */ |
| 99 | int |
| 100 | mount(struct mount_args *uap) |
| 101 | { |
| 102 | struct thread *td = curthread; |
| 103 | struct proc *p = td->td_proc; |
| 104 | struct vnode *vp; |
| 105 | struct mount *mp; |
| 106 | struct vfsconf *vfsp; |
| 107 | int error, flag = 0, flag2 = 0; |
| 108 | struct vattr va; |
| 109 | struct nameidata nd; |
| 110 | char fstypename[MFSNAMELEN]; |
| 111 | lwkt_tokref vlock; |
| 112 | lwkt_tokref ilock; |
| 113 | |
| 114 | KKASSERT(p); |
| 115 | if (p->p_ucred->cr_prison != NULL) |
| 116 | return (EPERM); |
| 117 | if (usermount == 0 && (error = suser(td))) |
| 118 | return (error); |
| 119 | /* |
| 120 | * Do not allow NFS export by non-root users. |
| 121 | */ |
| 122 | if (SCARG(uap, flags) & MNT_EXPORTED) { |
| 123 | error = suser(td); |
| 124 | if (error) |
| 125 | return (error); |
| 126 | } |
| 127 | /* |
| 128 | * Silently enforce MNT_NOSUID and MNT_NODEV for non-root users |
| 129 | */ |
| 130 | if (suser(td)) |
| 131 | SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; |
| 132 | /* |
| 133 | * Get vnode to be covered |
| 134 | */ |
| 135 | NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_LOCKLEAF, UIO_USERSPACE, |
| 136 | SCARG(uap, path), td); |
| 137 | if ((error = namei(&nd)) != 0) |
| 138 | return (error); |
| 139 | NDFREE(&nd, NDF_ONLY_PNBUF); |
| 140 | vp = nd.ni_vp; |
| 141 | if (SCARG(uap, flags) & MNT_UPDATE) { |
| 142 | if ((vp->v_flag & VROOT) == 0) { |
| 143 | vput(vp); |
| 144 | return (EINVAL); |
| 145 | } |
| 146 | mp = vp->v_mount; |
| 147 | flag = mp->mnt_flag; |
| 148 | flag2 = mp->mnt_kern_flag; |
| 149 | /* |
| 150 | * We only allow the filesystem to be reloaded if it |
| 151 | * is currently mounted read-only. |
| 152 | */ |
| 153 | if ((SCARG(uap, flags) & MNT_RELOAD) && |
| 154 | ((mp->mnt_flag & MNT_RDONLY) == 0)) { |
| 155 | vput(vp); |
| 156 | return (EOPNOTSUPP); /* Needs translation */ |
| 157 | } |
| 158 | /* |
| 159 | * Only root, or the user that did the original mount is |
| 160 | * permitted to update it. |
| 161 | */ |
| 162 | if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && |
| 163 | (error = suser(td))) { |
| 164 | vput(vp); |
| 165 | return (error); |
| 166 | } |
| 167 | if (vfs_busy(mp, LK_NOWAIT, NULL, td)) { |
| 168 | vput(vp); |
| 169 | return (EBUSY); |
| 170 | } |
| 171 | lwkt_gettoken(&vlock, vp->v_interlock); |
| 172 | if ((vp->v_flag & VMOUNT) != 0 || |
| 173 | vp->v_mountedhere != NULL) { |
| 174 | lwkt_reltoken(&vlock); |
| 175 | vfs_unbusy(mp, td); |
| 176 | vput(vp); |
| 177 | return (EBUSY); |
| 178 | } |
| 179 | vp->v_flag |= VMOUNT; |
| 180 | lwkt_reltoken(&vlock); |
| 181 | mp->mnt_flag |= |
| 182 | SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); |
| 183 | VOP_UNLOCK(vp, NULL, 0, td); |
| 184 | goto update; |
| 185 | } |
| 186 | /* |
| 187 | * If the user is not root, ensure that they own the directory |
| 188 | * onto which we are attempting to mount. |
| 189 | */ |
| 190 | if ((error = VOP_GETATTR(vp, &va, td)) || |
| 191 | (va.va_uid != p->p_ucred->cr_uid && |
| 192 | (error = suser(td)))) { |
| 193 | vput(vp); |
| 194 | return (error); |
| 195 | } |
| 196 | if ((error = vinvalbuf(vp, V_SAVE, td, 0, 0)) != 0) { |
| 197 | vput(vp); |
| 198 | return (error); |
| 199 | } |
| 200 | if (vp->v_type != VDIR) { |
| 201 | vput(vp); |
| 202 | return (ENOTDIR); |
| 203 | } |
| 204 | if ((error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL)) != 0) { |
| 205 | vput(vp); |
| 206 | return (error); |
| 207 | } |
| 208 | for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) |
| 209 | if (!strcmp(vfsp->vfc_name, fstypename)) |
| 210 | break; |
| 211 | if (vfsp == NULL) { |
| 212 | linker_file_t lf; |
| 213 | |
| 214 | /* Only load modules for root (very important!) */ |
| 215 | if ((error = suser(td)) != 0) { |
| 216 | vput(vp); |
| 217 | return error; |
| 218 | } |
| 219 | error = linker_load_file(fstypename, &lf); |
| 220 | if (error || lf == NULL) { |
| 221 | vput(vp); |
| 222 | if (lf == NULL) |
| 223 | error = ENODEV; |
| 224 | return error; |
| 225 | } |
| 226 | lf->userrefs++; |
| 227 | /* lookup again, see if the VFS was loaded */ |
| 228 | for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) |
| 229 | if (!strcmp(vfsp->vfc_name, fstypename)) |
| 230 | break; |
| 231 | if (vfsp == NULL) { |
| 232 | lf->userrefs--; |
| 233 | linker_file_unload(lf); |
| 234 | vput(vp); |
| 235 | return (ENODEV); |
| 236 | } |
| 237 | } |
| 238 | lwkt_gettoken(&vlock, vp->v_interlock); |
| 239 | if ((vp->v_flag & VMOUNT) != 0 || |
| 240 | vp->v_mountedhere != NULL) { |
| 241 | lwkt_reltoken(&vlock); |
| 242 | vput(vp); |
| 243 | return (EBUSY); |
| 244 | } |
| 245 | vp->v_flag |= VMOUNT; |
| 246 | lwkt_reltoken(&vlock); |
| 247 | |
| 248 | /* |
| 249 | * Allocate and initialize the filesystem. |
| 250 | */ |
| 251 | mp = malloc(sizeof(struct mount), M_MOUNT, M_WAITOK); |
| 252 | bzero((char *)mp, (u_long)sizeof(struct mount)); |
| 253 | TAILQ_INIT(&mp->mnt_nvnodelist); |
| 254 | TAILQ_INIT(&mp->mnt_reservedvnlist); |
| 255 | mp->mnt_nvnodelistsize = 0; |
| 256 | lockinit(&mp->mnt_lock, 0, "vfslock", 0, LK_NOPAUSE); |
| 257 | vfs_busy(mp, LK_NOWAIT, NULL, td); |
| 258 | mp->mnt_op = vfsp->vfc_vfsops; |
| 259 | mp->mnt_vfc = vfsp; |
| 260 | vfsp->vfc_refcount++; |
| 261 | mp->mnt_stat.f_type = vfsp->vfc_typenum; |
| 262 | mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK; |
| 263 | strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); |
| 264 | mp->mnt_vnodecovered = vp; |
| 265 | mp->mnt_stat.f_owner = p->p_ucred->cr_uid; |
| 266 | mp->mnt_iosize_max = DFLTPHYS; |
| 267 | VOP_UNLOCK(vp, NULL, 0, td); |
| 268 | update: |
| 269 | /* |
| 270 | * Set the mount level flags. |
| 271 | */ |
| 272 | if (SCARG(uap, flags) & MNT_RDONLY) |
| 273 | mp->mnt_flag |= MNT_RDONLY; |
| 274 | else if (mp->mnt_flag & MNT_RDONLY) |
| 275 | mp->mnt_kern_flag |= MNTK_WANTRDWR; |
| 276 | mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | |
| 277 | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOATIME | |
| 278 | MNT_NOSYMFOLLOW | MNT_IGNORE | |
| 279 | MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR); |
| 280 | mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | |
| 281 | MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_FORCE | |
| 282 | MNT_NOSYMFOLLOW | MNT_IGNORE | |
| 283 | MNT_NOATIME | MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR); |
| 284 | /* |
| 285 | * Mount the filesystem. |
| 286 | * XXX The final recipients of VFS_MOUNT just overwrite the ndp they |
| 287 | * get. No freeing of cn_pnbuf. |
| 288 | */ |
| 289 | error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, td); |
| 290 | if (mp->mnt_flag & MNT_UPDATE) { |
| 291 | if (mp->mnt_kern_flag & MNTK_WANTRDWR) |
| 292 | mp->mnt_flag &= ~MNT_RDONLY; |
| 293 | mp->mnt_flag &=~ (MNT_UPDATE | MNT_RELOAD | MNT_FORCE); |
| 294 | mp->mnt_kern_flag &=~ MNTK_WANTRDWR; |
| 295 | if (error) { |
| 296 | mp->mnt_flag = flag; |
| 297 | mp->mnt_kern_flag = flag2; |
| 298 | } |
| 299 | vfs_unbusy(mp, td); |
| 300 | lwkt_gettoken(&vlock, vp->v_interlock); |
| 301 | vp->v_flag &= ~VMOUNT; |
| 302 | lwkt_reltoken(&vlock); |
| 303 | vrele(vp); |
| 304 | return (error); |
| 305 | } |
| 306 | vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td); |
| 307 | /* |
| 308 | * Put the new filesystem on the mount list after root. |
| 309 | */ |
| 310 | cache_purge(vp); |
| 311 | if (!error) { |
| 312 | lwkt_gettoken(&vlock, vp->v_interlock); |
| 313 | vp->v_flag &= ~VMOUNT; |
| 314 | vp->v_mountedhere = mp; |
| 315 | lwkt_reltoken(&vlock); |
| 316 | lwkt_gettoken(&ilock, &mountlist_token); |
| 317 | TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); |
| 318 | lwkt_reltoken(&ilock); |
| 319 | checkdirs(vp); |
| 320 | VOP_UNLOCK(vp, NULL, 0, td); |
| 321 | error = vfs_allocate_syncvnode(mp); |
| 322 | vfs_unbusy(mp, td); |
| 323 | if ((error = VFS_START(mp, 0, td)) != 0) |
| 324 | vrele(vp); |
| 325 | } else { |
| 326 | lwkt_gettoken(&vlock, vp->v_interlock); |
| 327 | vp->v_flag &= ~VMOUNT; |
| 328 | lwkt_reltoken(&vlock); |
| 329 | mp->mnt_vfc->vfc_refcount--; |
| 330 | vfs_unbusy(mp, td); |
| 331 | free((caddr_t)mp, M_MOUNT); |
| 332 | vput(vp); |
| 333 | } |
| 334 | return (error); |
| 335 | } |
| 336 | |
| 337 | /* |
| 338 | * Scan all active processes to see if any of them have a current |
| 339 | * or root directory onto which the new filesystem has just been |
| 340 | * mounted. If so, replace them with the new mount point. |
| 341 | */ |
| 342 | static void |
| 343 | checkdirs(struct vnode *olddp) |
| 344 | { |
| 345 | struct filedesc *fdp; |
| 346 | struct vnode *newdp; |
| 347 | struct proc *p; |
| 348 | |
| 349 | if (olddp->v_usecount == 1) |
| 350 | return; |
| 351 | if (VFS_ROOT(olddp->v_mountedhere, &newdp)) |
| 352 | panic("mount: lost mount"); |
| 353 | FOREACH_PROC_IN_SYSTEM(p) { |
| 354 | fdp = p->p_fd; |
| 355 | if (fdp->fd_cdir == olddp) { |
| 356 | vrele(fdp->fd_cdir); |
| 357 | VREF(newdp); |
| 358 | fdp->fd_cdir = newdp; |
| 359 | } |
| 360 | if (fdp->fd_rdir == olddp) { |
| 361 | vrele(fdp->fd_rdir); |
| 362 | VREF(newdp); |
| 363 | fdp->fd_rdir = newdp; |
| 364 | } |
| 365 | } |
| 366 | if (rootvnode == olddp) { |
| 367 | vrele(rootvnode); |
| 368 | VREF(newdp); |
| 369 | rootvnode = newdp; |
| 370 | vfs_cache_setroot(rootvnode); |
| 371 | } |
| 372 | vput(newdp); |
| 373 | } |
| 374 | |
| 375 | /* |
| 376 | * Unmount a file system. |
| 377 | * |
| 378 | * Note: unmount takes a path to the vnode mounted on as argument, |
| 379 | * not special file (as before). |
| 380 | */ |
| 381 | /* |
| 382 | * umount_args(char *path, int flags) |
| 383 | */ |
| 384 | /* ARGSUSED */ |
| 385 | int |
| 386 | unmount(struct unmount_args *uap) |
| 387 | { |
| 388 | struct thread *td = curthread; |
| 389 | struct proc *p = td->td_proc; |
| 390 | struct vnode *vp; |
| 391 | struct mount *mp; |
| 392 | int error; |
| 393 | struct nameidata nd; |
| 394 | |
| 395 | KKASSERT(p); |
| 396 | if (p->p_ucred->cr_prison != NULL) |
| 397 | return (EPERM); |
| 398 | if (usermount == 0 && (error = suser(td))) |
| 399 | return (error); |
| 400 | |
| 401 | NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_LOCKLEAF, UIO_USERSPACE, |
| 402 | SCARG(uap, path), td); |
| 403 | if ((error = namei(&nd)) != 0) |
| 404 | return (error); |
| 405 | vp = nd.ni_vp; |
| 406 | NDFREE(&nd, NDF_ONLY_PNBUF); |
| 407 | mp = vp->v_mount; |
| 408 | |
| 409 | /* |
| 410 | * Only root, or the user that did the original mount is |
| 411 | * permitted to unmount this filesystem. |
| 412 | */ |
| 413 | if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && |
| 414 | (error = suser(td))) { |
| 415 | vput(vp); |
| 416 | return (error); |
| 417 | } |
| 418 | |
| 419 | /* |
| 420 | * Don't allow unmounting the root file system. |
| 421 | */ |
| 422 | if (mp->mnt_flag & MNT_ROOTFS) { |
| 423 | vput(vp); |
| 424 | return (EINVAL); |
| 425 | } |
| 426 | |
| 427 | /* |
| 428 | * Must be the root of the filesystem |
| 429 | */ |
| 430 | if ((vp->v_flag & VROOT) == 0) { |
| 431 | vput(vp); |
| 432 | return (EINVAL); |
| 433 | } |
| 434 | vput(vp); |
| 435 | return (dounmount(mp, SCARG(uap, flags), td)); |
| 436 | } |
| 437 | |
| 438 | /* |
| 439 | * Do the actual file system unmount. |
| 440 | */ |
| 441 | int |
| 442 | dounmount(struct mount *mp, int flags, struct thread *td) |
| 443 | { |
| 444 | struct vnode *coveredvp; |
| 445 | int error; |
| 446 | int async_flag; |
| 447 | lwkt_tokref ilock; |
| 448 | |
| 449 | lwkt_gettoken(&ilock, &mountlist_token); |
| 450 | if (mp->mnt_kern_flag & MNTK_UNMOUNT) { |
| 451 | lwkt_reltoken(&ilock); |
| 452 | return (EBUSY); |
| 453 | } |
| 454 | mp->mnt_kern_flag |= MNTK_UNMOUNT; |
| 455 | /* Allow filesystems to detect that a forced unmount is in progress. */ |
| 456 | if (flags & MNT_FORCE) |
| 457 | mp->mnt_kern_flag |= MNTK_UNMOUNTF; |
| 458 | error = lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK | |
| 459 | ((flags & MNT_FORCE) ? 0 : LK_NOWAIT), &ilock, td); |
| 460 | if (error) { |
| 461 | mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); |
| 462 | if (mp->mnt_kern_flag & MNTK_MWAIT) |
| 463 | wakeup((caddr_t)mp); |
| 464 | return (error); |
| 465 | } |
| 466 | |
| 467 | if (mp->mnt_flag & MNT_EXPUBLIC) |
| 468 | vfs_setpublicfs(NULL, NULL, NULL); |
| 469 | |
| 470 | vfs_msync(mp, MNT_WAIT); |
| 471 | async_flag = mp->mnt_flag & MNT_ASYNC; |
| 472 | mp->mnt_flag &=~ MNT_ASYNC; |
| 473 | cache_purgevfs(mp); /* remove cache entries for this file sys */ |
| 474 | if (mp->mnt_syncer != NULL) |
| 475 | vrele(mp->mnt_syncer); |
| 476 | if (((mp->mnt_flag & MNT_RDONLY) || |
| 477 | (error = VFS_SYNC(mp, MNT_WAIT, td)) == 0) || |
| 478 | (flags & MNT_FORCE)) |
| 479 | error = VFS_UNMOUNT(mp, flags, td); |
| 480 | lwkt_gettokref(&ilock); |
| 481 | if (error) { |
| 482 | if (mp->mnt_syncer == NULL) |
| 483 | vfs_allocate_syncvnode(mp); |
| 484 | mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); |
| 485 | mp->mnt_flag |= async_flag; |
| 486 | lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, |
| 487 | &ilock, td); |
| 488 | if (mp->mnt_kern_flag & MNTK_MWAIT) |
| 489 | wakeup((caddr_t)mp); |
| 490 | return (error); |
| 491 | } |
| 492 | TAILQ_REMOVE(&mountlist, mp, mnt_list); |
| 493 | if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { |
| 494 | coveredvp->v_mountedhere = NULL; |
| 495 | vrele(coveredvp); |
| 496 | } |
| 497 | mp->mnt_vfc->vfc_refcount--; |
| 498 | if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) |
| 499 | panic("unmount: dangling vnode"); |
| 500 | lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &ilock, td); |
| 501 | if (mp->mnt_kern_flag & MNTK_MWAIT) |
| 502 | wakeup((caddr_t)mp); |
| 503 | free((caddr_t)mp, M_MOUNT); |
| 504 | return (0); |
| 505 | } |
| 506 | |
| 507 | /* |
| 508 | * Sync each mounted filesystem. |
| 509 | */ |
| 510 | |
| 511 | #ifdef DEBUG |
| 512 | static int syncprt = 0; |
| 513 | SYSCTL_INT(_debug, OID_AUTO, syncprt, CTLFLAG_RW, &syncprt, 0, ""); |
| 514 | #endif |
| 515 | |
| 516 | /* ARGSUSED */ |
| 517 | int |
| 518 | sync(struct sync_args *uap) |
| 519 | { |
| 520 | struct thread *td = curthread; |
| 521 | struct mount *mp, *nmp; |
| 522 | lwkt_tokref ilock; |
| 523 | int asyncflag; |
| 524 | |
| 525 | lwkt_gettoken(&ilock, &mountlist_token); |
| 526 | for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { |
| 527 | if (vfs_busy(mp, LK_NOWAIT, &ilock, td)) { |
| 528 | nmp = TAILQ_NEXT(mp, mnt_list); |
| 529 | continue; |
| 530 | } |
| 531 | if ((mp->mnt_flag & MNT_RDONLY) == 0) { |
| 532 | asyncflag = mp->mnt_flag & MNT_ASYNC; |
| 533 | mp->mnt_flag &= ~MNT_ASYNC; |
| 534 | vfs_msync(mp, MNT_NOWAIT); |
| 535 | VFS_SYNC(mp, MNT_NOWAIT, td); |
| 536 | mp->mnt_flag |= asyncflag; |
| 537 | } |
| 538 | lwkt_gettokref(&ilock); |
| 539 | nmp = TAILQ_NEXT(mp, mnt_list); |
| 540 | vfs_unbusy(mp, td); |
| 541 | } |
| 542 | lwkt_reltoken(&ilock); |
| 543 | #if 0 |
| 544 | /* |
| 545 | * XXX don't call vfs_bufstats() yet because that routine |
| 546 | * was not imported in the Lite2 merge. |
| 547 | */ |
| 548 | #ifdef DIAGNOSTIC |
| 549 | if (syncprt) |
| 550 | vfs_bufstats(); |
| 551 | #endif /* DIAGNOSTIC */ |
| 552 | #endif |
| 553 | return (0); |
| 554 | } |
| 555 | |
| 556 | /* XXX PRISON: could be per prison flag */ |
| 557 | static int prison_quotas; |
| 558 | #if 0 |
| 559 | SYSCTL_INT(_kern_prison, OID_AUTO, quotas, CTLFLAG_RW, &prison_quotas, 0, ""); |
| 560 | #endif |
| 561 | |
| 562 | /* |
| 563 | * quotactl_args(char *path, int fcmd, int uid, caddr_t arg) |
| 564 | * |
| 565 | * Change filesystem quotas. |
| 566 | */ |
| 567 | /* ARGSUSED */ |
| 568 | int |
| 569 | quotactl(struct quotactl_args *uap) |
| 570 | { |
| 571 | struct thread *td = curthread; |
| 572 | struct proc *p = td->td_proc; |
| 573 | struct mount *mp; |
| 574 | int error; |
| 575 | struct nameidata nd; |
| 576 | |
| 577 | KKASSERT(p); |
| 578 | if (p->p_ucred->cr_prison && !prison_quotas) |
| 579 | return (EPERM); |
| 580 | NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, |
| 581 | SCARG(uap, path), td); |
| 582 | if ((error = namei(&nd)) != 0) |
| 583 | return (error); |
| 584 | mp = nd.ni_vp->v_mount; |
| 585 | NDFREE(&nd, NDF_ONLY_PNBUF); |
| 586 | vrele(nd.ni_vp); |
| 587 | return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), |
| 588 | SCARG(uap, arg), td)); |
| 589 | } |
| 590 | |
| 591 | int |
| 592 | kern_statfs(struct nameidata *nd, struct statfs *buf) |
| 593 | { |
| 594 | struct thread *td = curthread; |
| 595 | struct mount *mp; |
| 596 | struct statfs *sp; |
| 597 | int error; |
| 598 | |
| 599 | error = namei(nd); |
| 600 | if (error) |
| 601 | return (error); |
| 602 | mp = nd->ni_vp->v_mount; |
| 603 | sp = &mp->mnt_stat; |
| 604 | NDFREE(nd, NDF_ONLY_PNBUF); |
| 605 | vrele(nd->ni_vp); |
| 606 | error = VFS_STATFS(mp, sp, td); |
| 607 | if (error) |
| 608 | return (error); |
| 609 | sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; |
| 610 | bcopy(sp, buf, sizeof(*buf)); |
| 611 | /* Only root should have access to the fsid's. */ |
| 612 | if (suser(td)) |
| 613 | buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0; |
| 614 | return (0); |
| 615 | } |
| 616 | |
| 617 | /* |
| 618 | * statfs_args(char *path, struct statfs *buf) |
| 619 | * |
| 620 | * Get filesystem statistics. |
| 621 | */ |
| 622 | int |
| 623 | statfs(struct statfs_args *uap) |
| 624 | { |
| 625 | struct thread *td = curthread; |
| 626 | struct nameidata nd; |
| 627 | struct statfs buf; |
| 628 | int error; |
| 629 | |
| 630 | NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, uap->path, td); |
| 631 | |
| 632 | error = kern_statfs(&nd, &buf); |
| 633 | |
| 634 | if (error == 0) |
| 635 | error = copyout(&buf, uap->buf, sizeof(*uap->buf)); |
| 636 | return (error); |
| 637 | } |
| 638 | |
| 639 | int |
| 640 | kern_fstatfs(int fd, struct statfs *buf) |
| 641 | { |
| 642 | struct thread *td = curthread; |
| 643 | struct proc *p = td->td_proc; |
| 644 | struct file *fp; |
| 645 | struct mount *mp; |
| 646 | struct statfs *sp; |
| 647 | int error; |
| 648 | |
| 649 | KKASSERT(p); |
| 650 | error = getvnode(p->p_fd, fd, &fp); |
| 651 | if (error) |
| 652 | return (error); |
| 653 | mp = ((struct vnode *)fp->f_data)->v_mount; |
| 654 | if (mp == NULL) |
| 655 | return (EBADF); |
| 656 | sp = &mp->mnt_stat; |
| 657 | error = VFS_STATFS(mp, sp, td); |
| 658 | if (error) |
| 659 | return (error); |
| 660 | sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; |
| 661 | bcopy(sp, buf, sizeof(*buf)); |
| 662 | /* Only root should have access to the fsid's. */ |
| 663 | if (suser(td)) |
| 664 | buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0; |
| 665 | return (0); |
| 666 | } |
| 667 | |
| 668 | /* |
| 669 | * fstatfs_args(int fd, struct statfs *buf) |
| 670 | * |
| 671 | * Get filesystem statistics. |
| 672 | */ |
| 673 | int |
| 674 | fstatfs(struct fstatfs_args *uap) |
| 675 | { |
| 676 | struct statfs buf; |
| 677 | int error; |
| 678 | |
| 679 | error = kern_fstatfs(uap->fd, &buf); |
| 680 | |
| 681 | if (error == 0) |
| 682 | error = copyout(&buf, uap->buf, sizeof(*uap->buf)); |
| 683 | return (error); |
| 684 | } |
| 685 | |
| 686 | /* |
| 687 | * getfsstat_args(struct statfs *buf, long bufsize, int flags) |
| 688 | * |
| 689 | * Get statistics on all filesystems. |
| 690 | */ |
| 691 | /* ARGSUSED */ |
| 692 | int |
| 693 | getfsstat(struct getfsstat_args *uap) |
| 694 | { |
| 695 | struct thread *td = curthread; |
| 696 | struct mount *mp, *nmp; |
| 697 | struct statfs *sp; |
| 698 | caddr_t sfsp; |
| 699 | lwkt_tokref ilock; |
| 700 | long count, maxcount, error; |
| 701 | |
| 702 | maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); |
| 703 | sfsp = (caddr_t)SCARG(uap, buf); |
| 704 | count = 0; |
| 705 | lwkt_gettoken(&ilock, &mountlist_token); |
| 706 | for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { |
| 707 | if (vfs_busy(mp, LK_NOWAIT, &ilock, td)) { |
| 708 | nmp = TAILQ_NEXT(mp, mnt_list); |
| 709 | continue; |
| 710 | } |
| 711 | if (sfsp && count < maxcount) { |
| 712 | sp = &mp->mnt_stat; |
| 713 | /* |
| 714 | * If MNT_NOWAIT or MNT_LAZY is specified, do not |
| 715 | * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY |
| 716 | * overrides MNT_WAIT. |
| 717 | */ |
| 718 | if (((SCARG(uap, flags) & (MNT_LAZY|MNT_NOWAIT)) == 0 || |
| 719 | (SCARG(uap, flags) & MNT_WAIT)) && |
| 720 | (error = VFS_STATFS(mp, sp, td))) { |
| 721 | lwkt_gettokref(&ilock); |
| 722 | nmp = TAILQ_NEXT(mp, mnt_list); |
| 723 | vfs_unbusy(mp, td); |
| 724 | continue; |
| 725 | } |
| 726 | sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; |
| 727 | error = copyout((caddr_t)sp, sfsp, sizeof(*sp)); |
| 728 | if (error) { |
| 729 | vfs_unbusy(mp, td); |
| 730 | return (error); |
| 731 | } |
| 732 | sfsp += sizeof(*sp); |
| 733 | } |
| 734 | count++; |
| 735 | lwkt_gettokref(&ilock); |
| 736 | nmp = TAILQ_NEXT(mp, mnt_list); |
| 737 | vfs_unbusy(mp, td); |
| 738 | } |
| 739 | lwkt_reltoken(&ilock); |
| 740 | if (sfsp && count > maxcount) |
| 741 | uap->sysmsg_result = maxcount; |
| 742 | else |
| 743 | uap->sysmsg_result = count; |
| 744 | return (0); |
| 745 | } |
| 746 | |
| 747 | /* |
| 748 | * fchdir_args(int fd) |
| 749 | * |
| 750 | * Change current working directory to a given file descriptor. |
| 751 | */ |
| 752 | /* ARGSUSED */ |
| 753 | int |
| 754 | fchdir(struct fchdir_args *uap) |
| 755 | { |
| 756 | struct thread *td = curthread; |
| 757 | struct proc *p = td->td_proc; |
| 758 | struct filedesc *fdp = p->p_fd; |
| 759 | struct vnode *vp, *tdp; |
| 760 | struct mount *mp; |
| 761 | struct file *fp; |
| 762 | int error; |
| 763 | |
| 764 | if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) |
| 765 | return (error); |
| 766 | vp = (struct vnode *)fp->f_data; |
| 767 | VREF(vp); |
| 768 | vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td); |
| 769 | if (vp->v_type != VDIR) |
| 770 | error = ENOTDIR; |
| 771 | else |
| 772 | error = VOP_ACCESS(vp, VEXEC, p->p_ucred, td); |
| 773 | while (!error && (mp = vp->v_mountedhere) != NULL) { |
| 774 | if (vfs_busy(mp, 0, NULL, td)) |
| 775 | continue; |
| 776 | error = VFS_ROOT(mp, &tdp); |
| 777 | vfs_unbusy(mp, td); |
| 778 | if (error) |
| 779 | break; |
| 780 | vput(vp); |
| 781 | vp = tdp; |
| 782 | } |
| 783 | if (error) { |
| 784 | vput(vp); |
| 785 | return (error); |
| 786 | } |
| 787 | VOP_UNLOCK(vp, NULL, 0, td); |
| 788 | vrele(fdp->fd_cdir); |
| 789 | fdp->fd_cdir = vp; |
| 790 | return (0); |
| 791 | } |
| 792 | |
| 793 | int |
| 794 | kern_chdir(struct nameidata *nd) |
| 795 | { |
| 796 | struct thread *td = curthread; |
| 797 | struct proc *p = td->td_proc; |
| 798 | struct filedesc *fdp = p->p_fd; |
| 799 | int error; |
| 800 | |
| 801 | if ((error = namei(nd)) != 0) |
| 802 | return (error); |
| 803 | if ((error = checkvp_chdir(nd->ni_vp, td)) == 0) { |
| 804 | vrele(fdp->fd_cdir); |
| 805 | fdp->fd_cdir = nd->ni_vp; |
| 806 | VREF(fdp->fd_cdir); |
| 807 | } |
| 808 | NDFREE(nd, ~(NDF_NO_FREE_PNBUF | NDF_NO_VP_PUT)); |
| 809 | return (error); |
| 810 | } |
| 811 | |
| 812 | /* |
| 813 | * chdir_args(char *path) |
| 814 | * |
| 815 | * Change current working directory (``.''). |
| 816 | */ |
| 817 | int |
| 818 | chdir(struct chdir_args *uap) |
| 819 | { |
| 820 | struct thread *td = curthread; |
| 821 | struct nameidata nd; |
| 822 | int error; |
| 823 | |
| 824 | NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_LOCKLEAF, UIO_USERSPACE, |
| 825 | uap->path, td); |
| 826 | |
| 827 | error = kern_chdir(&nd); |
| 828 | |
| 829 | return (error); |
| 830 | } |
| 831 | |
| 832 | /* |
| 833 | * Helper function for raised chroot(2) security function: Refuse if |
| 834 | * any filedescriptors are open directories. |
| 835 | */ |
| 836 | static int |
| 837 | chroot_refuse_vdir_fds(fdp) |
| 838 | struct filedesc *fdp; |
| 839 | { |
| 840 | struct vnode *vp; |
| 841 | struct file *fp; |
| 842 | int error; |
| 843 | int fd; |
| 844 | |
| 845 | for (fd = 0; fd < fdp->fd_nfiles ; fd++) { |
| 846 | error = getvnode(fdp, fd, &fp); |
| 847 | if (error) |
| 848 | continue; |
| 849 | vp = (struct vnode *)fp->f_data; |
| 850 | if (vp->v_type != VDIR) |
| 851 | continue; |
| 852 | return(EPERM); |
| 853 | } |
| 854 | return (0); |
| 855 | } |
| 856 | |
| 857 | /* |
| 858 | * This sysctl determines if we will allow a process to chroot(2) if it |
| 859 | * has a directory open: |
| 860 | * 0: disallowed for all processes. |
| 861 | * 1: allowed for processes that were not already chroot(2)'ed. |
| 862 | * 2: allowed for all processes. |
| 863 | */ |
| 864 | |
| 865 | static int chroot_allow_open_directories = 1; |
| 866 | |
| 867 | SYSCTL_INT(_kern, OID_AUTO, chroot_allow_open_directories, CTLFLAG_RW, |
| 868 | &chroot_allow_open_directories, 0, ""); |
| 869 | |
| 870 | /* |
| 871 | * Chroot to the specified vnode. vp must be locked and referenced on |
| 872 | * call, and will be left locked and referenced on return. This routine |
| 873 | * may acquire additional refs on the vnode when associating it with |
| 874 | * the process's root and/or jail dirs. |
| 875 | */ |
| 876 | int |
| 877 | kern_chroot(struct vnode *vp) |
| 878 | { |
| 879 | struct thread *td = curthread; |
| 880 | struct proc *p = td->td_proc; |
| 881 | struct filedesc *fdp = p->p_fd; |
| 882 | int error; |
| 883 | |
| 884 | /* |
| 885 | * Only root can chroot |
| 886 | */ |
| 887 | if ((error = suser_cred(p->p_ucred, PRISON_ROOT)) != 0) |
| 888 | return (error); |
| 889 | |
| 890 | /* |
| 891 | * Disallow open directory descriptors (fchdir() breakouts). |
| 892 | */ |
| 893 | if (chroot_allow_open_directories == 0 || |
| 894 | (chroot_allow_open_directories == 1 && fdp->fd_rdir != rootvnode)) { |
| 895 | if ((error = chroot_refuse_vdir_fds(fdp)) != 0) |
| 896 | return (error); |
| 897 | } |
| 898 | |
| 899 | /* |
| 900 | * Check the validity of vp as a directory to change to and |
| 901 | * associate it with rdir/jdir. |
| 902 | */ |
| 903 | if ((error = checkvp_chdir(vp, td)) == 0) { |
| 904 | vrele(fdp->fd_rdir); |
| 905 | fdp->fd_rdir = vp; |
| 906 | VREF(fdp->fd_rdir); |
| 907 | if (fdp->fd_jdir == NULL) { |
| 908 | fdp->fd_jdir = vp; |
| 909 | VREF(fdp->fd_jdir); |
| 910 | } |
| 911 | } |
| 912 | return (error); |
| 913 | } |
| 914 | |
| 915 | /* |
| 916 | * chroot_args(char *path) |
| 917 | * |
| 918 | * Change notion of root (``/'') directory. |
| 919 | */ |
| 920 | /* ARGSUSED */ |
| 921 | int |
| 922 | chroot(struct chroot_args *uap) |
| 923 | { |
| 924 | struct thread *td = curthread; |
| 925 | struct nameidata nd; |
| 926 | int error; |
| 927 | |
| 928 | KKASSERT(td->td_proc); |
| 929 | NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_LOCKLEAF, UIO_USERSPACE, |
| 930 | SCARG(uap, path), td); |
| 931 | if ((error = namei(&nd)) == 0) { |
| 932 | error = kern_chroot(nd.ni_vp); |
| 933 | NDFREE(&nd, ~(NDF_NO_FREE_PNBUF | NDF_NO_VP_PUT)); |
| 934 | } |
| 935 | return (error); |
| 936 | } |
| 937 | |
| 938 | /* |
| 939 | * Common routine for chroot and chdir. Given a locked, referenced vnode, |
| 940 | * determine whether it is legal to chdir to the vnode. The vnode's state |
| 941 | * is not changed by this call. |
| 942 | */ |
| 943 | int |
| 944 | checkvp_chdir(struct vnode *vp, struct thread *td) |
| 945 | { |
| 946 | int error; |
| 947 | |
| 948 | if (vp->v_type != VDIR) |
| 949 | error = ENOTDIR; |
| 950 | else |
| 951 | error = VOP_ACCESS(vp, VEXEC, td->td_proc->p_ucred, td); |
| 952 | return (error); |
| 953 | } |
| 954 | |
| 955 | int |
| 956 | kern_open(struct nameidata *nd, int oflags, int mode, int *res) |
| 957 | { |
| 958 | struct thread *td = curthread; |
| 959 | struct proc *p = td->td_proc; |
| 960 | struct filedesc *fdp = p->p_fd; |
| 961 | struct file *fp; |
| 962 | struct vnode *vp; |
| 963 | int cmode, flags; |
| 964 | struct file *nfp; |
| 965 | int type, indx, error; |
| 966 | struct flock lf; |
| 967 | |
| 968 | if ((oflags & O_ACCMODE) == O_ACCMODE) |
| 969 | return (EINVAL); |
| 970 | flags = FFLAGS(oflags); |
| 971 | error = falloc(p, &nfp, &indx); |
| 972 | if (error) |
| 973 | return (error); |
| 974 | fp = nfp; |
| 975 | cmode = ((mode &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; |
| 976 | p->p_dupfd = -indx - 1; /* XXX check for fdopen */ |
| 977 | /* |
| 978 | * Bump the ref count to prevent another process from closing |
| 979 | * the descriptor while we are blocked in vn_open() |
| 980 | */ |
| 981 | fhold(fp); |
| 982 | error = vn_open(nd, flags, cmode); |
| 983 | if (error) { |
| 984 | /* |
| 985 | * release our own reference |
| 986 | */ |
| 987 | fdrop(fp, td); |
| 988 | |
| 989 | /* |
| 990 | * handle special fdopen() case. bleh. dupfdopen() is |
| 991 | * responsible for dropping the old contents of ofiles[indx] |
| 992 | * if it succeeds. |
| 993 | */ |
| 994 | if ((error == ENODEV || error == ENXIO) && |
| 995 | p->p_dupfd >= 0 && /* XXX from fdopen */ |
| 996 | (error = |
| 997 | dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) { |
| 998 | *res = indx; |
| 999 | return (0); |
| 1000 | } |
| 1001 | /* |
| 1002 | * Clean up the descriptor, but only if another thread hadn't |
| 1003 | * replaced or closed it. |
| 1004 | */ |
| 1005 | if (fdp->fd_ofiles[indx] == fp) { |
| 1006 | fdp->fd_ofiles[indx] = NULL; |
| 1007 | fdrop(fp, td); |
| 1008 | } |
| 1009 | |
| 1010 | if (error == ERESTART) |
| 1011 | error = EINTR; |
| 1012 | return (error); |
| 1013 | } |
| 1014 | p->p_dupfd = 0; |
| 1015 | NDFREE(nd, NDF_ONLY_PNBUF); |
| 1016 | vp = nd->ni_vp; |
| 1017 | |
| 1018 | /* |
| 1019 | * There should be 2 references on the file, one from the descriptor |
| 1020 | * table, and one for us. |
| 1021 | * |
| 1022 | * Handle the case where someone closed the file (via its file |
| 1023 | * descriptor) while we were blocked. The end result should look |
| 1024 | * like opening the file succeeded but it was immediately closed. |
| 1025 | */ |
| 1026 | if (fp->f_count == 1) { |
| 1027 | KASSERT(fdp->fd_ofiles[indx] != fp, |
| 1028 | ("Open file descriptor lost all refs")); |
| 1029 | VOP_UNLOCK(vp, NULL, 0, td); |
| 1030 | vn_close(vp, flags & FMASK, td); |
| 1031 | fdrop(fp, td); |
| 1032 | *res = indx; |
| 1033 | return 0; |
| 1034 | } |
| 1035 | |
| 1036 | fp->f_data = (caddr_t)vp; |
| 1037 | fp->f_flag = flags & FMASK; |
| 1038 | fp->f_ops = &vnops; |
| 1039 | fp->f_type = (vp->v_type == VFIFO ? DTYPE_FIFO : DTYPE_VNODE); |
| 1040 | if (flags & (O_EXLOCK | O_SHLOCK)) { |
| 1041 | lf.l_whence = SEEK_SET; |
| 1042 | lf.l_start = 0; |
| 1043 | lf.l_len = 0; |
| 1044 | if (flags & O_EXLOCK) |
| 1045 | lf.l_type = F_WRLCK; |
| 1046 | else |
| 1047 | lf.l_type = F_RDLCK; |
| 1048 | type = F_FLOCK; |
| 1049 | if ((flags & FNONBLOCK) == 0) |
| 1050 | type |= F_WAIT; |
| 1051 | VOP_UNLOCK(vp, NULL, 0, td); |
| 1052 | if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0) { |
| 1053 | /* |
| 1054 | * lock request failed. Normally close the descriptor |
| 1055 | * but handle the case where someone might have dup()d |
| 1056 | * it when we weren't looking. One reference is |
| 1057 | * owned by the descriptor array, the other by us. |
| 1058 | */ |
| 1059 | if (fdp->fd_ofiles[indx] == fp) { |
| 1060 | fdp->fd_ofiles[indx] = NULL; |
| 1061 | fdrop(fp, td); |
| 1062 | } |
| 1063 | fdrop(fp, td); |
| 1064 | return (error); |
| 1065 | } |
| 1066 | vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td); |
| 1067 | fp->f_flag |= FHASLOCK; |
| 1068 | } |
| 1069 | /* assert that vn_open created a backing object if one is needed */ |
| 1070 | KASSERT(!vn_canvmio(vp) || VOP_GETVOBJECT(vp, NULL) == 0, |
| 1071 | ("open: vmio vnode has no backing object after vn_open")); |
| 1072 | VOP_UNLOCK(vp, NULL, 0, td); |
| 1073 | |
| 1074 | /* |
| 1075 | * release our private reference, leaving the one associated with the |
| 1076 | * descriptor table intact. |
| 1077 | */ |
| 1078 | fdrop(fp, td); |
| 1079 | *res = indx; |
| 1080 | return (0); |
| 1081 | } |
| 1082 | |
| 1083 | /* |
| 1084 | * open_args(char *path, int flags, int mode) |
| 1085 | * |
| 1086 | * Check permissions, allocate an open file structure, |
| 1087 | * and call the device open routine if any. |
| 1088 | */ |
| 1089 | int |
| 1090 | open(struct open_args *uap) |
| 1091 | { |
| 1092 | struct thread *td = curthread; |
| 1093 | struct nameidata nd; |
| 1094 | int error; |
| 1095 | |
| 1096 | NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, uap->path, td); |
| 1097 | |
| 1098 | error = kern_open(&nd, uap->flags, uap->mode, &uap->sysmsg_result); |
| 1099 | |
| 1100 | return (error); |
| 1101 | } |
| 1102 | |
| 1103 | int |
| 1104 | kern_mknod(struct nameidata *nd, int mode, int dev) |
| 1105 | { |
| 1106 | struct thread *td = curthread; |
| 1107 | struct proc *p = td->td_proc; |
| 1108 | struct vnode *vp; |
| 1109 | struct vattr vattr; |
| 1110 | int error; |
| 1111 | int whiteout = 0; |
| 1112 | |
| 1113 | KKASSERT(p); |
| 1114 | |
| 1115 | switch (mode & S_IFMT) { |
| 1116 | case S_IFCHR: |
| 1117 | case S_IFBLK: |
| 1118 | error = suser(td); |
| 1119 | break; |
| 1120 | default: |
| 1121 | error = suser_cred(p->p_ucred, PRISON_ROOT); |
| 1122 | break; |
| 1123 | } |
| 1124 | if (error) |
| 1125 | return (error); |
| 1126 | bwillwrite(); |
| 1127 | error = namei(nd); |
| 1128 | if (error) |
| 1129 | return (error); |
| 1130 | vp = nd->ni_vp; |
| 1131 | if (vp != NULL) |
| 1132 | error = EEXIST; |
| 1133 | else { |
| 1134 | VATTR_NULL(&vattr); |
| 1135 | vattr.va_mode = (mode & ALLPERMS) &~ p->p_fd->fd_cmask; |
| 1136 | vattr.va_rdev = dev; |
| 1137 | whiteout = 0; |
| 1138 | |
| 1139 | switch (mode & S_IFMT) { |
| 1140 | case S_IFMT: /* used by badsect to flag bad sectors */ |
| 1141 | vattr.va_type = VBAD; |
| 1142 | break; |
| 1143 | case S_IFCHR: |
| 1144 | vattr.va_type = VCHR; |
| 1145 | break; |
| 1146 | case S_IFBLK: |
| 1147 | vattr.va_type = VBLK; |
| 1148 | break; |
| 1149 | case S_IFWHT: |
| 1150 | whiteout = 1; |
| 1151 | break; |
| 1152 | default: |
| 1153 | error = EINVAL; |
| 1154 | break; |
| 1155 | } |
| 1156 | } |
| 1157 | if (error == 0) { |
| 1158 | VOP_LEASE(nd->ni_dvp, td, p->p_ucred, LEASE_WRITE); |
| 1159 | if (whiteout) |
| 1160 | error = VOP_WHITEOUT(nd->ni_dvp, NCPNULL, |
| 1161 | &nd->ni_cnd, NAMEI_CREATE); |
| 1162 | else { |
| 1163 | error = VOP_MKNOD(nd->ni_dvp, NCPNULL, &nd->ni_vp, |
| 1164 | &nd->ni_cnd, &vattr); |
| 1165 | if (error == 0) |
| 1166 | vput(nd->ni_vp); |
| 1167 | } |
| 1168 | NDFREE(nd, NDF_ONLY_PNBUF); |
| 1169 | vput(nd->ni_dvp); |
| 1170 | } else { |
| 1171 | NDFREE(nd, NDF_ONLY_PNBUF); |
| 1172 | if (nd->ni_dvp == vp) |
| 1173 | vrele(nd->ni_dvp); |
| 1174 | else |
| 1175 | vput(nd->ni_dvp); |
| 1176 | if (vp) |
| 1177 | vrele(vp); |
| 1178 | } |
| 1179 | ASSERT_VOP_UNLOCKED(nd->ni_dvp, "mknod"); |
| 1180 | ASSERT_VOP_UNLOCKED(nd->ni_vp, "mknod"); |
| 1181 | return (error); |
| 1182 | } |
| 1183 | |
| 1184 | /* |
| 1185 | * mknod_args(char *path, int mode, int dev) |
| 1186 | * |
| 1187 | * Create a special file. |
| 1188 | */ |
| 1189 | int |
| 1190 | mknod(struct mknod_args *uap) |
| 1191 | { |
| 1192 | struct thread *td = curthread; |
| 1193 | struct nameidata nd; |
| 1194 | int error; |
| 1195 | |
| 1196 | NDINIT(&nd, NAMEI_CREATE, CNP_LOCKPARENT, UIO_USERSPACE, uap->path, |
| 1197 | td); |
| 1198 | |
| 1199 | error = kern_mknod(&nd, uap->mode, uap->dev); |
| 1200 | |
| 1201 | return (error); |
| 1202 | } |
| 1203 | |
| 1204 | int |
| 1205 | kern_mkfifo(struct nameidata *nd, int mode) |
| 1206 | { |
| 1207 | struct thread *td = curthread; |
| 1208 | struct proc *p = td->td_proc; |
| 1209 | struct vattr vattr; |
| 1210 | int error; |
| 1211 | |
| 1212 | bwillwrite(); |
| 1213 | error = namei(nd); |
| 1214 | if (error) |
| 1215 | return (error); |
| 1216 | if (nd->ni_vp != NULL) { |
| 1217 | NDFREE(nd, NDF_ONLY_PNBUF); |
| 1218 | if (nd->ni_dvp == nd->ni_vp) |
| 1219 | vrele(nd->ni_dvp); |
| 1220 | else |
| 1221 | vput(nd->ni_dvp); |
| 1222 | vrele(nd->ni_vp); |
| 1223 | return (EEXIST); |
| 1224 | } |
| 1225 | VATTR_NULL(&vattr); |
| 1226 | vattr.va_type = VFIFO; |
| 1227 | vattr.va_mode = (mode & ALLPERMS) &~ p->p_fd->fd_cmask; |
| 1228 | VOP_LEASE(nd->ni_dvp, td, p->p_ucred, LEASE_WRITE); |
| 1229 | error = VOP_MKNOD(nd->ni_dvp, NCPNULL, &nd->ni_vp, &nd->ni_cnd, &vattr); |
| 1230 | if (error == 0) |
| 1231 | vput(nd->ni_vp); |
| 1232 | NDFREE(nd, NDF_ONLY_PNBUF); |
| 1233 | vput(nd->ni_dvp); |
| 1234 | return (error); |
| 1235 | } |
| 1236 | |
| 1237 | /* |
| 1238 | * mkfifo_args(char *path, int mode) |
| 1239 | * |
| 1240 | * Create a named pipe. |
| 1241 | */ |
| 1242 | int |
| 1243 | mkfifo(struct mkfifo_args *uap) |
| 1244 | { |
| 1245 | struct thread *td = curthread; |
| 1246 | struct nameidata nd; |
| 1247 | int error; |
| 1248 | |
| 1249 | NDINIT(&nd, NAMEI_CREATE, CNP_LOCKPARENT, UIO_USERSPACE, uap->path, |
| 1250 | td); |
| 1251 | |
| 1252 | error = kern_mkfifo(&nd, uap->mode); |
| 1253 | |
| 1254 | return (error); |
| 1255 | } |
| 1256 | |
| 1257 | int |
| 1258 | kern_link(struct nameidata *nd, struct nameidata *linknd) |
| 1259 | { |
| 1260 | struct thread *td = curthread; |
| 1261 | struct proc *p = td->td_proc; |
| 1262 | struct vnode *vp; |
| 1263 | int error; |
| 1264 | |
| 1265 | bwillwrite(); |
| 1266 | error = namei(nd); |
| 1267 | if (error) |
| 1268 | return (error); |
| 1269 | NDFREE(nd, NDF_ONLY_PNBUF); |
| 1270 | vp = nd->ni_vp; |
| 1271 | if (vp->v_type == VDIR) |
| 1272 | error = EPERM; /* POSIX */ |
| 1273 | else { |
| 1274 | error = namei(linknd); |
| 1275 | if (error == 0) { |
| 1276 | if (linknd->ni_vp != NULL) { |
| 1277 | if (linknd->ni_vp) |
| 1278 | vrele(linknd->ni_vp); |
| 1279 | error = EEXIST; |
| 1280 | } else { |
| 1281 | VOP_LEASE(linknd->ni_dvp, td, p->p_ucred, |
| 1282 | LEASE_WRITE); |
| 1283 | VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE); |
| 1284 | error = VOP_LINK(linknd->ni_dvp, NCPNULL, vp, |
| 1285 | &linknd->ni_cnd); |
| 1286 | } |
| 1287 | NDFREE(linknd, NDF_ONLY_PNBUF); |
| 1288 | if (linknd->ni_dvp == linknd->ni_vp) |
| 1289 | vrele(linknd->ni_dvp); |
| 1290 | else |
| 1291 | vput(linknd->ni_dvp); |
| 1292 | ASSERT_VOP_UNLOCKED(linknd->ni_dvp, "link"); |
| 1293 | ASSERT_VOP_UNLOCKED(linknd->ni_vp, "link"); |
| 1294 | } |
| 1295 | } |
| 1296 | vrele(vp); |
| 1297 | return (error); |
| 1298 | } |
| 1299 | |
| 1300 | /* |
| 1301 | * link_args(char *path, char *link) |
| 1302 | * |
| 1303 | * Make a hard file link. |
| 1304 | */ |
| 1305 | int |
| 1306 | link(struct link_args *uap) |
| 1307 | { |
| 1308 | struct thread *td = curthread; |
| 1309 | struct nameidata nd, linknd; |
| 1310 | int error; |
| 1311 | |
| 1312 | NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_NOOBJ, UIO_USERSPACE, |
| 1313 | uap->path, td); |
| 1314 | NDINIT(&linknd, NAMEI_CREATE, CNP_LOCKPARENT | CNP_NOOBJ, |
| 1315 | UIO_USERSPACE, uap->link, td); |
| 1316 | |
| 1317 | error = kern_link(&nd, &linknd); |
| 1318 | |
| 1319 | return (error); |
| 1320 | } |
| 1321 | |
| 1322 | int |
| 1323 | kern_symlink(char *path, struct nameidata *nd) |
| 1324 | { |
| 1325 | struct thread *td = curthread; |
| 1326 | struct proc *p = td->td_proc; |
| 1327 | struct vattr vattr; |
| 1328 | int error; |
| 1329 | |
| 1330 | bwillwrite(); |
| 1331 | error = namei(nd); |
| 1332 | if (error) |
| 1333 | return (error); |
| 1334 | if (nd->ni_vp) { |
| 1335 | NDFREE(nd, NDF_ONLY_PNBUF); |
| 1336 | if (nd->ni_dvp == nd->ni_vp) |
| 1337 | vrele(nd->ni_dvp); |
| 1338 | else |
| 1339 | vput(nd->ni_dvp); |
| 1340 | vrele(nd->ni_vp); |
| 1341 | return (EEXIST); |
| 1342 | } |
| 1343 | VATTR_NULL(&vattr); |
| 1344 | vattr.va_mode = ACCESSPERMS &~ p->p_fd->fd_cmask; |
| 1345 | VOP_LEASE(nd->ni_dvp, td, p->p_ucred, LEASE_WRITE); |
| 1346 | error = VOP_SYMLINK(nd->ni_dvp, NCPNULL, &nd->ni_vp, &nd->ni_cnd, |
| 1347 | &vattr, path); |
| 1348 | NDFREE(nd, NDF_ONLY_PNBUF); |
| 1349 | if (error == 0) |
| 1350 | vput(nd->ni_vp); |
| 1351 | vput(nd->ni_dvp); |
| 1352 | ASSERT_VOP_UNLOCKED(nd->ni_dvp, "symlink"); |
| 1353 | ASSERT_VOP_UNLOCKED(nd->ni_vp, "symlink"); |
| 1354 | |
| 1355 | return (error); |
| 1356 | } |
| 1357 | |
| 1358 | /* |
| 1359 | * symlink(char *path, char *link) |
| 1360 | * |
| 1361 | * Make a symbolic link. |
| 1362 | */ |
| 1363 | int |
| 1364 | symlink(struct symlink_args *uap) |
| 1365 | { |
| 1366 | struct thread *td = curthread; |
| 1367 | struct nameidata nd; |
| 1368 | char *path; |
| 1369 | int error; |
| 1370 | |
| 1371 | path = zalloc(namei_zone); |
| 1372 | error = copyinstr(uap->path, path, MAXPATHLEN, NULL); |
| 1373 | if (error == 0) { |
| 1374 | NDINIT(&nd, NAMEI_CREATE, CNP_LOCKPARENT | CNP_NOOBJ, |
| 1375 | UIO_USERSPACE, uap->link, td); |
| 1376 | error = kern_symlink(path, &nd); |
| 1377 | } |
| 1378 | zfree(namei_zone, path); |
| 1379 | return (error); |
| 1380 | } |
| 1381 | |
| 1382 | /* |
| 1383 | * undelete_args(char *path) |
| 1384 | * |
| 1385 | * Delete a whiteout from the filesystem. |
| 1386 | */ |
| 1387 | /* ARGSUSED */ |
| 1388 | int |
| 1389 | undelete(struct undelete_args *uap) |
| 1390 | { |
| 1391 | struct thread *td = curthread; |
| 1392 | struct proc *p = td->td_proc; |
| 1393 | int error; |
| 1394 | struct nameidata nd; |
| 1395 | |
| 1396 | bwillwrite(); |
| 1397 | NDINIT(&nd, NAMEI_DELETE, CNP_LOCKPARENT | CNP_DOWHITEOUT, UIO_USERSPACE, |
| 1398 | SCARG(uap, path), td); |
| 1399 | error = namei(&nd); |
| 1400 | if (error) |
| 1401 | return (error); |
| 1402 | |
| 1403 | if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & CNP_ISWHITEOUT)) { |
| 1404 | NDFREE(&nd, NDF_ONLY_PNBUF); |
| 1405 | if (nd.ni_dvp == nd.ni_vp) |
| 1406 | vrele(nd.ni_dvp); |
| 1407 | else |
| 1408 | vput(nd.ni_dvp); |
| 1409 | if (nd.ni_vp) |
| 1410 | vrele(nd.ni_vp); |
| 1411 | return (EEXIST); |
| 1412 | } |
| 1413 | |
| 1414 | VOP_LEASE(nd.ni_dvp, td, p->p_ucred, LEASE_WRITE); |
| 1415 | error = VOP_WHITEOUT(nd.ni_dvp, NCPNULL, &nd.ni_cnd, NAMEI_DELETE); |
| 1416 | NDFREE(&nd, NDF_ONLY_PNBUF); |
| 1417 | vput(nd.ni_dvp); |
| 1418 | ASSERT_VOP_UNLOCKED(nd.ni_dvp, "undelete"); |
| 1419 | ASSERT_VOP_UNLOCKED(nd.ni_vp, "undelete"); |
| 1420 | return (error); |
| 1421 | } |
| 1422 | |
| 1423 | int |
| 1424 | kern_unlink(struct nameidata *nd) |
| 1425 | { |
| 1426 | struct thread *td = curthread; |
| 1427 | struct proc *p = td->td_proc; |
| 1428 | struct vnode *vp; |
| 1429 | int error; |
| 1430 | |
| 1431 | bwillwrite(); |
| 1432 | error = namei(nd); |
| 1433 | if (error) |
| 1434 | return (error); |
| 1435 | vp = nd->ni_vp; |
| 1436 | VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE); |
| 1437 | vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td); |
| 1438 | |
| 1439 | if (vp->v_type == VDIR) |
| 1440 | error = EPERM; /* POSIX */ |
| 1441 | else { |
| 1442 | /* |
| 1443 | * The root of a mounted filesystem cannot be deleted. |
| 1444 | * |
| 1445 | * XXX: can this only be a VDIR case? |
| 1446 | */ |
| 1447 | if (vp->v_flag & VROOT) |
| 1448 | error = EBUSY; |
| 1449 | } |
| 1450 | |
| 1451 | if (error == 0) { |
| 1452 | VOP_LEASE(nd->ni_dvp, td, p->p_ucred, LEASE_WRITE); |
| 1453 | error = VOP_REMOVE(nd->ni_dvp, NCPNULL, vp, &nd->ni_cnd); |
| 1454 | } |
| 1455 | NDFREE(nd, NDF_ONLY_PNBUF); |
| 1456 | if (nd->ni_dvp == vp) |
| 1457 | vrele(nd->ni_dvp); |
| 1458 | else |
| 1459 | vput(nd->ni_dvp); |
| 1460 | if (vp != NULLVP) |
| 1461 | vput(vp); |
| 1462 | ASSERT_VOP_UNLOCKED(nd->ni_dvp, "unlink"); |
| 1463 | ASSERT_VOP_UNLOCKED(nd->ni_vp, "unlink"); |
| 1464 | return (error); |
| 1465 | } |
| 1466 | |
| 1467 | /* |
| 1468 | * unlink_args(char *path) |
| 1469 | * |
| 1470 | * Delete a name from the filesystem. |
| 1471 | */ |
| 1472 | int |
| 1473 | unlink(struct unlink_args *uap) |
| 1474 | { |
| 1475 | struct thread *td = curthread; |
| 1476 | struct nameidata nd; |
| 1477 | int error; |
| 1478 | |
| 1479 | NDINIT(&nd, NAMEI_DELETE, CNP_LOCKPARENT, UIO_USERSPACE, uap->path, |
| 1480 | td); |
| 1481 | |
| 1482 | error = kern_unlink(&nd); |
| 1483 | |
| 1484 | return (error); |
| 1485 | } |
| 1486 | |
| 1487 | int |
| 1488 | kern_lseek(int fd, off_t offset, int whence, off_t *res) |
| 1489 | { |
| 1490 | struct thread *td = curthread; |
| 1491 | struct proc *p = td->td_proc; |
| 1492 | struct filedesc *fdp = p->p_fd; |
| 1493 | struct file *fp; |
| 1494 | struct vattr vattr; |
| 1495 | int error; |
| 1496 | |
| 1497 | if (fd >= fdp->fd_nfiles || |
| 1498 | (fp = fdp->fd_ofiles[fd]) == NULL) |
| 1499 | return (EBADF); |
| 1500 | if (fp->f_type != DTYPE_VNODE) |
| 1501 | return (ESPIPE); |
| 1502 | switch (whence) { |
| 1503 | case L_INCR: |
| 1504 | fp->f_offset += offset; |
| 1505 | break; |
| 1506 | case L_XTND: |
| 1507 | error=VOP_GETATTR((struct vnode *)fp->f_data, &vattr, td); |
| 1508 | if (error) |
| 1509 | return (error); |
| 1510 | fp->f_offset = offset + vattr.va_size; |
| 1511 | break; |
| 1512 | case L_SET: |
| 1513 | fp->f_offset = offset; |
| 1514 | break; |
| 1515 | default: |
| 1516 | return (EINVAL); |
| 1517 | } |
| 1518 | *res = fp->f_offset; |
| 1519 | return (0); |
| 1520 | } |
| 1521 | |
| 1522 | /* |
| 1523 | * lseek_args(int fd, int pad, off_t offset, int whence) |
| 1524 | * |
| 1525 | * Reposition read/write file offset. |
| 1526 | */ |
| 1527 | int |
| 1528 | lseek(struct lseek_args *uap) |
| 1529 | { |
| 1530 | int error; |
| 1531 | |
| 1532 | error = kern_lseek(uap->fd, uap->offset, uap->whence, |
| 1533 | &uap->sysmsg_offset); |
| 1534 | |
| 1535 | return (error); |
| 1536 | } |
| 1537 | |
| 1538 | int |
| 1539 | kern_access(struct nameidata *nd, int aflags) |
| 1540 | { |
| 1541 | struct thread *td = curthread; |
| 1542 | struct proc *p = td->td_proc; |
| 1543 | struct ucred *cred, *tmpcred; |
| 1544 | struct vnode *vp; |
| 1545 | int error, flags; |
| 1546 | |
| 1547 | cred = p->p_ucred; |
| 1548 | /* |
| 1549 | * Create and modify a temporary credential instead of one that |
| 1550 | * is potentially shared. This could also mess up socket |
| 1551 | * buffer accounting which can run in an interrupt context. |
| 1552 | */ |
| 1553 | tmpcred = crdup(cred); |
| 1554 | tmpcred->cr_uid = p->p_ucred->cr_ruid; |
| 1555 | tmpcred->cr_groups[0] = p->p_ucred->cr_rgid; |
| 1556 | p->p_ucred = tmpcred; |
| 1557 | nd->ni_cnd.cn_cred = tmpcred; |
| 1558 | error = namei(nd); |
| 1559 | if (error) |
| 1560 | goto out1; |
| 1561 | vp = nd->ni_vp; |
| 1562 | |
| 1563 | /* Flags == 0 means only check for existence. */ |
| 1564 | if (aflags) { |
| 1565 | flags = 0; |
| 1566 | if (aflags & R_OK) |
| 1567 | flags |= VREAD; |
| 1568 | if (aflags & W_OK) |
| 1569 | flags |= VWRITE; |
| 1570 | if (aflags & X_OK) |
| 1571 | flags |= VEXEC; |
| 1572 | if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) |
| 1573 | error = VOP_ACCESS(vp, flags, tmpcred, td); |
| 1574 | } |
| 1575 | NDFREE(nd, NDF_ONLY_PNBUF); |
| 1576 | vput(vp); |
| 1577 | out1: |
| 1578 | p->p_ucred = cred; |
| 1579 | crfree(tmpcred); |
| 1580 | return (error); |
| 1581 | } |
| 1582 | |
| 1583 | /* |
| 1584 | * access_args(char *path, int flags) |
| 1585 | * |
| 1586 | * Check access permissions. |
| 1587 | */ |
| 1588 | int |
| 1589 | access(struct access_args *uap) |
| 1590 | { |
| 1591 | struct thread *td = curthread; |
| 1592 | struct nameidata nd; |
| 1593 | int error; |
| 1594 | |
| 1595 | NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_LOCKLEAF | CNP_NOOBJ, |
| 1596 | UIO_USERSPACE, uap->path, td); |
| 1597 | |
| 1598 | error = kern_access(&nd, uap->flags); |
| 1599 | |
| 1600 | return (error); |
| 1601 | } |
| 1602 | |
| 1603 | int |
| 1604 | kern_stat(struct nameidata *nd, struct stat *st) |
| 1605 | { |
| 1606 | struct thread *td = curthread; |
| 1607 | int error; |
| 1608 | |
| 1609 | error = namei(nd); |
| 1610 | if (error) |
| 1611 | return (error); |
| 1612 | error = vn_stat(nd->ni_vp, st, td); |
| 1613 | NDFREE(nd, NDF_ONLY_PNBUF); |
| 1614 | vput(nd->ni_vp); |
| 1615 | return (error); |
| 1616 | } |
| 1617 | |
| 1618 | /* |
| 1619 | * stat_args(char *path, struct stat *ub) |
| 1620 | * |
| 1621 | * Get file status; this version follows links. |
| 1622 | */ |
| 1623 | int |
| 1624 | stat(struct stat_args *uap) |
| 1625 | { |
| 1626 | struct thread *td = curthread; |
| 1627 | struct nameidata nd; |
| 1628 | struct stat st; |
| 1629 | int error; |
| 1630 | |
| 1631 | NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_LOCKLEAF | CNP_NOOBJ, |
| 1632 | UIO_USERSPACE, uap->path, td); |
| 1633 | |
| 1634 | error = kern_stat(&nd, &st); |
| 1635 | |
| 1636 | if (error == 0) |
| 1637 | error = copyout(&st, uap->ub, sizeof(*uap->ub)); |
| 1638 | return (error); |
| 1639 | } |
| 1640 | |
| 1641 | /* |
| 1642 | * lstat_args(char *path, struct stat *ub) |
| 1643 | * |
| 1644 | * Get file status; this version does not follow links. |
| 1645 | */ |
| 1646 | int |
| 1647 | lstat(struct lstat_args *uap) |
| 1648 | { |
| 1649 | struct thread *td = curthread; |
| 1650 | struct nameidata nd; |
| 1651 | struct stat st; |
| 1652 | int error; |
| 1653 | |
| 1654 | NDINIT(&nd, NAMEI_LOOKUP, CNP_LOCKLEAF | CNP_NOOBJ, |
| 1655 | UIO_USERSPACE, SCARG(uap, path), td); |
| 1656 | |
| 1657 | error = kern_stat(&nd, &st); |
| 1658 | |
| 1659 | if (error == 0) |
| 1660 | error = copyout(&st, uap->ub, sizeof(*uap->ub)); |
| 1661 | return (error); |
| 1662 | } |
| 1663 | |
| 1664 | void |
| 1665 | cvtnstat(sb, nsb) |
| 1666 | struct stat *sb; |
| 1667 | struct nstat *nsb; |
| 1668 | { |
| 1669 | nsb->st_dev = sb->st_dev; |
| 1670 | nsb->st_ino = sb->st_ino; |
| 1671 | nsb->st_mode = sb->st_mode; |
| 1672 | nsb->st_nlink = sb->st_nlink; |
| 1673 | nsb->st_uid = sb->st_uid; |
| 1674 | nsb->st_gid = sb->st_gid; |
| 1675 | nsb->st_rdev = sb->st_rdev; |
| 1676 | nsb->st_atimespec = sb->st_atimespec; |
| 1677 | nsb->st_mtimespec = sb->st_mtimespec; |
| 1678 | nsb->st_ctimespec = sb->st_ctimespec; |
| 1679 | nsb->st_size = sb->st_size; |
| 1680 | nsb->st_blocks = sb->st_blocks; |
| 1681 | nsb->st_blksize = sb->st_blksize; |
| 1682 | nsb->st_flags = sb->st_flags; |
| 1683 | nsb->st_gen = sb->st_gen; |
| 1684 | nsb->st_qspare[0] = sb->st_qspare[0]; |
| 1685 | nsb->st_qspare[1] = sb->st_qspare[1]; |
| 1686 | } |
| 1687 | |
| 1688 | /* |
| 1689 | * nstat_args(char *path, struct nstat *ub) |
| 1690 | */ |
| 1691 | /* ARGSUSED */ |
| 1692 | int |
| 1693 | nstat(struct nstat_args *uap) |
| 1694 | { |
| 1695 | struct thread *td = curthread; |
| 1696 | struct stat sb; |
| 1697 | struct nstat nsb; |
| 1698 | int error; |
| 1699 | struct nameidata nd; |
| 1700 | |
| 1701 | NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_LOCKLEAF | CNP_NOOBJ, |
| 1702 | UIO_USERSPACE, SCARG(uap, path), td); |
| 1703 | if ((error = namei(&nd)) != 0) |
| 1704 | return (error); |
| 1705 | NDFREE(&nd, NDF_ONLY_PNBUF); |
| 1706 | error = vn_stat(nd.ni_vp, &sb, td); |
| 1707 | vput(nd.ni_vp); |
| 1708 | if (error) |
| 1709 | return (error); |
| 1710 | cvtnstat(&sb, &nsb); |
| 1711 | error = copyout((caddr_t)&nsb, (caddr_t)SCARG(uap, ub), sizeof (nsb)); |
| 1712 | return (error); |
| 1713 | } |
| 1714 | |
| 1715 | /* |
| 1716 | * lstat_args(char *path, struct stat *ub) |
| 1717 | * |
| 1718 | * Get file status; this version does not follow links. |
| 1719 | */ |
| 1720 | /* ARGSUSED */ |
| 1721 | int |
| 1722 | nlstat(struct nlstat_args *uap) |
| 1723 | { |
| 1724 | struct thread *td = curthread; |
| 1725 | int error; |
| 1726 | struct vnode *vp; |
| 1727 | struct stat sb; |
| 1728 | struct nstat nsb; |
| 1729 | struct nameidata nd; |
| 1730 | |
| 1731 | NDINIT(&nd, NAMEI_LOOKUP, CNP_LOCKLEAF | CNP_NOOBJ, |
| 1732 | UIO_USERSPACE, SCARG(uap, path), td); |
| 1733 | if ((error = namei(&nd)) != 0) |
| 1734 | return (error); |
| 1735 | vp = nd.ni_vp; |
| 1736 | NDFREE(&nd, NDF_ONLY_PNBUF); |
| 1737 | error = vn_stat(vp, &sb, td); |
| 1738 | vput(vp); |
| 1739 | if (error) |
| 1740 | return (error); |
| 1741 | cvtnstat(&sb, &nsb); |
| 1742 | error = copyout((caddr_t)&nsb, (caddr_t)SCARG(uap, ub), sizeof (nsb)); |
| 1743 | return (error); |
| 1744 | } |
| 1745 | |
| 1746 | /* |
| 1747 | * pathconf_Args(char *path, int name) |
| 1748 | * |
| 1749 | * Get configurable pathname variables. |
| 1750 | */ |
| 1751 | /* ARGSUSED */ |
| 1752 | int |
| 1753 | pathconf(struct pathconf_args *uap) |
| 1754 | { |
| 1755 | struct thread *td = curthread; |
| 1756 | int error; |
| 1757 | struct nameidata nd; |
| 1758 | |
| 1759 | NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_LOCKLEAF | CNP_NOOBJ, |
| 1760 | UIO_USERSPACE, SCARG(uap, path), td); |
| 1761 | if ((error = namei(&nd)) != 0) |
| 1762 | return (error); |
| 1763 | NDFREE(&nd, NDF_ONLY_PNBUF); |
| 1764 | error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), uap->sysmsg_fds); |
| 1765 | vput(nd.ni_vp); |
| 1766 | return (error); |
| 1767 | } |
| 1768 | |
| 1769 | /* |
| 1770 | * XXX: daver |
| 1771 | * kern_readlink isn't properly split yet. There is a copyin burried |
| 1772 | * in VOP_READLINK(). |
| 1773 | */ |
| 1774 | int |
| 1775 | kern_readlink(struct nameidata *nd, char *buf, int count, int *res) |
| 1776 | { |
| 1777 | struct thread *td = curthread; |
| 1778 | struct proc *p = td->td_proc; |
| 1779 | struct vnode *vp; |
| 1780 | struct iovec aiov; |
| 1781 | struct uio auio; |
| 1782 | int error; |
| 1783 | |
| 1784 | error = namei(nd); |
| 1785 | if (error) |
| 1786 | return (error); |
| 1787 | NDFREE(nd, NDF_ONLY_PNBUF); |
| 1788 | vp = nd->ni_vp; |
| 1789 | if (vp->v_type != VLNK) |
| 1790 | error = EINVAL; |
| 1791 | else { |
| 1792 | aiov.iov_base = buf; |
| 1793 | aiov.iov_len = count; |
| 1794 | auio.uio_iov = &aiov; |
| 1795 | auio.uio_iovcnt = 1; |
| 1796 | auio.uio_offset = 0; |
| 1797 | auio.uio_rw = UIO_READ; |
| 1798 | auio.uio_segflg = UIO_USERSPACE; |
| 1799 | auio.uio_td = td; |
| 1800 | auio.uio_resid = count; |
| 1801 | error = VOP_READLINK(vp, &auio, p->p_ucred); |
| 1802 | } |
| 1803 | vput(vp); |
| 1804 | *res = count - auio.uio_resid; |
| 1805 | return (error); |
| 1806 | } |
| 1807 | |
| 1808 | /* |
| 1809 | * readlink_args(char *path, char *buf, int count) |
| 1810 | * |
| 1811 | * Return target name of a symbolic link. |
| 1812 | */ |
| 1813 | int |
| 1814 | readlink(struct readlink_args *uap) |
| 1815 | { |
| 1816 | struct thread *td = curthread; |
| 1817 | struct nameidata nd; |
| 1818 | int error; |
| 1819 | |
| 1820 | NDINIT(&nd, NAMEI_LOOKUP, CNP_LOCKLEAF | CNP_NOOBJ, UIO_USERSPACE, |
| 1821 | uap->path, td); |
| 1822 | |
| 1823 | error = kern_readlink(&nd, uap->buf, uap->count, |
| 1824 | &uap->sysmsg_result); |
| 1825 | |
| 1826 | return (error); |
| 1827 | } |
| 1828 | |
| 1829 | static int |
| 1830 | setfflags(struct vnode *vp, int flags) |
| 1831 | { |
| 1832 | struct thread *td = curthread; |
| 1833 | struct proc *p = td->td_proc; |
| 1834 | int error; |
| 1835 | struct vattr vattr; |
| 1836 | |
| 1837 | /* |
| 1838 | * Prevent non-root users from setting flags on devices. When |
| 1839 | * a device is reused, users can retain ownership of the device |
| 1840 | * if they are allowed to set flags and programs assume that |
| 1841 | * chown can't fail when done as root. |
| 1842 | */ |
| 1843 | if ((vp->v_type == VCHR || vp->v_type == VBLK) && |
| 1844 | ((error = suser_cred(p->p_ucred, PRISON_ROOT)) != 0)) |
| 1845 | return (error); |
| 1846 | |
| 1847 | VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE); |
| 1848 | vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td); |
| 1849 | VATTR_NULL(&vattr); |
| 1850 | vattr.va_flags = flags; |
| 1851 | error = VOP_SETATTR(vp, &vattr, p->p_ucred, td); |
| 1852 | VOP_UNLOCK(vp, NULL, 0, td); |
| 1853 | return (error); |
| 1854 | } |
| 1855 | |
| 1856 | /* |
| 1857 | * chflags(char *path, int flags) |
| 1858 | * |
| 1859 | * Change flags of a file given a path name. |
| 1860 | */ |
| 1861 | /* ARGSUSED */ |
| 1862 | int |
| 1863 | chflags(struct chflags_args *uap) |
| 1864 | { |
| 1865 | struct thread *td = curthread; |
| 1866 | int error; |
| 1867 | struct nameidata nd; |
| 1868 | |
| 1869 | NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, |
| 1870 | SCARG(uap, path), td); |
| 1871 | if ((error = namei(&nd)) != 0) |
| 1872 | return (error); |
| 1873 | NDFREE(&nd, NDF_ONLY_PNBUF); |
| 1874 | error = setfflags(nd.ni_vp, SCARG(uap, flags)); |
| 1875 | vrele(nd.ni_vp); |
| 1876 | return error; |
| 1877 | } |
| 1878 | |
| 1879 | /* |
| 1880 | * fchflags_args(int fd, int flags) |
| 1881 | * |
| 1882 | * Change flags of a file given a file descriptor. |
| 1883 | */ |
| 1884 | /* ARGSUSED */ |
| 1885 | int |
| 1886 | fchflags(struct fchflags_args *uap) |
| 1887 | { |
| 1888 | struct thread *td = curthread; |
| 1889 | struct proc *p = td->td_proc; |
| 1890 | struct file *fp; |
| 1891 | int error; |
| 1892 | |
| 1893 | if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) |
| 1894 | return (error); |
| 1895 | return setfflags((struct vnode *) fp->f_data, SCARG(uap, flags)); |
| 1896 | } |
| 1897 | |
| 1898 | static int |
| 1899 | setfmode(struct vnode *vp, int mode) |
| 1900 | { |
| 1901 | struct thread *td = curthread; |
| 1902 | struct proc *p = td->td_proc; |
| 1903 | int error; |
| 1904 | struct vattr vattr; |
| 1905 | |
| 1906 | VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE); |
| 1907 | vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td); |
| 1908 | VATTR_NULL(&vattr); |
| 1909 | vattr.va_mode = mode & ALLPERMS; |
| 1910 | error = VOP_SETATTR(vp, &vattr, p->p_ucred, td); |
| 1911 | VOP_UNLOCK(vp, NULL, 0, td); |
| 1912 | return error; |
| 1913 | } |
| 1914 | |
| 1915 | int |
| 1916 | kern_chmod(struct nameidata *nd, int mode) |
| 1917 | { |
| 1918 | int error; |
| 1919 | |
| 1920 | error = namei(nd); |
| 1921 | if (error) |
| 1922 | return (error); |
| 1923 | NDFREE(nd, NDF_ONLY_PNBUF); |
| 1924 | error = setfmode(nd->ni_vp, mode); |
| 1925 | vrele(nd->ni_vp); |
| 1926 | return error; |
| 1927 | } |
| 1928 | |
| 1929 | /* |
| 1930 | * chmod_args(char *path, int mode) |
| 1931 | * |
| 1932 | * Change mode of a file given path name. |
| 1933 | */ |
| 1934 | /* ARGSUSED */ |
| 1935 | int |
| 1936 | chmod(struct chmod_args *uap) |
| 1937 | { |
| 1938 | struct thread *td = curthread; |
| 1939 | struct nameidata nd; |
| 1940 | int error; |
| 1941 | |
| 1942 | NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, uap->path, td); |
| 1943 | |
| 1944 | error = kern_chmod(&nd, uap->mode); |
| 1945 | |
| 1946 | return (error); |
| 1947 | } |
| 1948 | |
| 1949 | /* |
| 1950 | * lchmod_args(char *path, int mode) |
| 1951 | * |
| 1952 | * Change mode of a file given path name (don't follow links.) |
| 1953 | */ |
| 1954 | /* ARGSUSED */ |
| 1955 | int |
| 1956 | lchmod(struct lchmod_args *uap) |
| 1957 | { |
| 1958 | struct thread *td = curthread; |
| 1959 | int error; |
| 1960 | struct nameidata nd; |
| 1961 | |
| 1962 | NDINIT(&nd, NAMEI_LOOKUP, 0, UIO_USERSPACE, SCARG(uap, path), td); |
| 1963 | if ((error = namei(&nd)) != 0) |
| 1964 | return (error); |
| 1965 | NDFREE(&nd, NDF_ONLY_PNBUF); |
| 1966 | error = setfmode(nd.ni_vp, SCARG(uap, mode)); |
| 1967 | vrele(nd.ni_vp); |
| 1968 | return error; |
| 1969 | } |
| 1970 | |
| 1971 | /* |
| 1972 | * fchmod_args(int fd, int mode) |
| 1973 | * |
| 1974 | * Change mode of a file given a file descriptor. |
| 1975 | */ |
| 1976 | /* ARGSUSED */ |
| 1977 | int |
| 1978 | fchmod(struct fchmod_args *uap) |
| 1979 | { |
| 1980 | struct thread *td = curthread; |
| 1981 | struct proc *p = td->td_proc; |
| 1982 | struct file *fp; |
| 1983 | int error; |
| 1984 | |
| 1985 | if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) |
| 1986 | return (error); |
| 1987 | return setfmode((struct vnode *)fp->f_data, SCARG(uap, mode)); |
| 1988 | } |
| 1989 | |
| 1990 | static int |
| 1991 | setfown(struct vnode *vp, uid_t uid, gid_t gid) |
| 1992 | { |
| 1993 | struct thread *td = curthread; |
| 1994 | struct proc *p = td->td_proc; |
| 1995 | int error; |
| 1996 | struct vattr vattr; |
| 1997 | |
| 1998 | VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE); |
| 1999 | vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td); |
| 2000 | VATTR_NULL(&vattr); |
| 2001 | vattr.va_uid = uid; |
| 2002 | vattr.va_gid = gid; |
| 2003 | error = VOP_SETATTR(vp, &vattr, p->p_ucred, td); |
| 2004 | VOP_UNLOCK(vp, NULL, 0, td); |
| 2005 | return error; |
| 2006 | } |
| 2007 | |
| 2008 | int |
| 2009 | kern_chown(struct nameidata *nd, int uid, int gid) |
| 2010 | { |
| 2011 | int error; |
| 2012 | |
| 2013 | error = namei(nd); |
| 2014 | if (error) |
| 2015 | return (error); |
| 2016 | NDFREE(nd, NDF_ONLY_PNBUF); |
| 2017 | error = setfown(nd->ni_vp, uid, gid); |
| 2018 | vrele(nd->ni_vp); |
| 2019 | return (error); |
| 2020 | } |
| 2021 | |
| 2022 | /* |
| 2023 | * chown(char *path, int uid, int gid) |
| 2024 | * |
| 2025 | * Set ownership given a path name. |
| 2026 | */ |
| 2027 | int |
| 2028 | chown(struct chown_args *uap) |
| 2029 | { |
| 2030 | struct thread *td = curthread; |
| 2031 | struct nameidata nd; |
| 2032 | int error; |
| 2033 | |
| 2034 | NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, uap->path, td); |
| 2035 | |
| 2036 | error = kern_chown(&nd, uap->uid, uap->gid); |
| 2037 | |
| 2038 | return (error); |
| 2039 | } |
| 2040 | |
| 2041 | /* |
| 2042 | * lchown_args(char *path, int uid, int gid) |
| 2043 | * |
| 2044 | * Set ownership given a path name, do not cross symlinks. |
| 2045 | */ |
| 2046 | int |
| 2047 | lchown(struct lchown_args *uap) |
| 2048 | { |
| 2049 | struct thread *td = curthread; |
| 2050 | int error; |
| 2051 | struct nameidata nd; |
| 2052 | |
| 2053 | NDINIT(&nd, NAMEI_LOOKUP, 0, UIO_USERSPACE, uap->path, td); |
| 2054 | |
| 2055 | error = kern_chown(&nd, uap->uid, uap->gid); |
| 2056 | |
| 2057 | return (error); |
| 2058 | } |
| 2059 | |
| 2060 | /* |
| 2061 | * fchown_args(int fd, int uid, int gid) |
| 2062 | * |
| 2063 | * Set ownership given a file descriptor. |
| 2064 | */ |
| 2065 | /* ARGSUSED */ |
| 2066 | int |
| 2067 | fchown(struct fchown_args *uap) |
| 2068 | { |
| 2069 | struct thread *td = curthread; |
| 2070 | struct proc *p = td->td_proc; |
| 2071 | struct file *fp; |
| 2072 | int error; |
| 2073 | |
| 2074 | if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) |
| 2075 | return (error); |
| 2076 | return setfown((struct vnode *)fp->f_data, |
| 2077 | SCARG(uap, uid), SCARG(uap, gid)); |
| 2078 | } |
| 2079 | |
| 2080 | static int |
| 2081 | getutimes(const struct timeval *tvp, struct timespec *tsp) |
| 2082 | { |
| 2083 | struct timeval tv[2]; |
| 2084 | |
| 2085 | if (tvp == NULL) { |
| 2086 | microtime(&tv[0]); |
| 2087 | TIMEVAL_TO_TIMESPEC(&tv[0], &tsp[0]); |
| 2088 | tsp[1] = tsp[0]; |
| 2089 | } else { |
| 2090 | TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]); |
| 2091 | TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]); |
| 2092 | } |
| 2093 | return 0; |
| 2094 | } |
| 2095 | |
| 2096 | static int |
| 2097 | setutimes(struct vnode *vp, const struct timespec *ts, int nullflag) |
| 2098 | { |
| 2099 | struct thread *td = curthread; |
| 2100 | struct proc *p = td->td_proc; |
| 2101 | int error; |
| 2102 | struct vattr vattr; |
| 2103 | |
| 2104 | VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE); |
| 2105 | vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td); |
| 2106 | VATTR_NULL(&vattr); |
| 2107 | vattr.va_atime = ts[0]; |
| 2108 | vattr.va_mtime = ts[1]; |
| 2109 | if (nullflag) |
| 2110 | vattr.va_vaflags |= VA_UTIMES_NULL; |
| 2111 | error = VOP_SETATTR(vp, &vattr, p->p_ucred, td); |
| 2112 | VOP_UNLOCK(vp, NULL, 0, td); |
| 2113 | return error; |
| 2114 | } |
| 2115 | |
| 2116 | int |
| 2117 | kern_utimes(struct nameidata *nd, struct timeval *tptr) |
| 2118 | { |
| 2119 | struct timespec ts[2]; |
| 2120 | int error; |
| 2121 | |
| 2122 | error = getutimes(tptr, ts); |
| 2123 | if (error) |
| 2124 | return (error); |
| 2125 | error = namei(nd); |
| 2126 | if (error) |
| 2127 | return (error); |
| 2128 | NDFREE(nd, NDF_ONLY_PNBUF); |
| 2129 | error = setutimes(nd->ni_vp, ts, tptr == NULL); |
| 2130 | vrele(nd->ni_vp); |
| 2131 | return (error); |
| 2132 | } |
| 2133 | |
| 2134 | /* |
| 2135 | * utimes_args(char *path, struct timeval *tptr) |
| 2136 | * |
| 2137 | * Set the access and modification times of a file. |
| 2138 | */ |
| 2139 | int |
| 2140 | utimes(struct utimes_args *uap) |
| 2141 | { |
| 2142 | struct thread *td = curthread; |
| 2143 | struct timeval tv[2]; |
| 2144 | struct nameidata nd; |
| 2145 | int error; |
| 2146 | |
| 2147 | if (uap->tptr) { |
| 2148 | error = copyin(uap->tptr, tv, sizeof(tv)); |
| 2149 | if (error) |
| 2150 | return (error); |
| 2151 | } |
| 2152 | NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, uap->path, td); |
| 2153 | |
| 2154 | error = kern_utimes(&nd, uap->tptr ? tv : NULL); |
| 2155 | |
| 2156 | return (error); |
| 2157 | } |
| 2158 | |
| 2159 | /* |
| 2160 | * lutimes_args(char *path, struct timeval *tptr) |
| 2161 | * |
| 2162 | * Set the access and modification times of a file. |
| 2163 | */ |
| 2164 | int |
| 2165 | lutimes(struct lutimes_args *uap) |
| 2166 | { |
| 2167 | struct thread *td = curthread; |
| 2168 | struct timeval tv[2]; |
| 2169 | struct nameidata nd; |
| 2170 | int error; |
| 2171 | |
| 2172 | if (uap->tptr) { |
| 2173 | error = copyin(uap->tptr, tv, sizeof(tv)); |
| 2174 | if (error) |
| 2175 | return (error); |
| 2176 | } |
| 2177 | NDINIT(&nd, NAMEI_LOOKUP, 0, UIO_USERSPACE, uap->path, td); |
| 2178 | |
| 2179 | error = kern_utimes(&nd, uap->tptr ? tv : NULL); |
| 2180 | |
| 2181 | return (error); |
| 2182 | } |
| 2183 | |
| 2184 | int |
| 2185 | kern_futimes(int fd, struct timeval *tptr) |
| 2186 | { |
| 2187 | struct thread *td = curthread; |
| 2188 | struct proc *p = td->td_proc; |
| 2189 | struct timespec ts[2]; |
| 2190 | struct file *fp; |
| 2191 | int error; |
| 2192 | |
| 2193 | error = getutimes(tptr, ts); |
| 2194 | if (error) |
| 2195 | return (error); |
| 2196 | error = getvnode(p->p_fd, fd, &fp); |
| 2197 | if (error) |
| 2198 | return (error); |
| 2199 | error = setutimes((struct vnode *)fp->f_data, ts, tptr == NULL); |
| 2200 | return (error); |
| 2201 | } |
| 2202 | |
| 2203 | /* |
| 2204 | * futimes_args(int fd, struct timeval *tptr) |
| 2205 | * |
| 2206 | * Set the access and modification times of a file. |
| 2207 | */ |
| 2208 | int |
| 2209 | futimes(struct futimes_args *uap) |
| 2210 | { |
| 2211 | struct timeval tv[2]; |
| 2212 | int error; |
| 2213 | |
| 2214 | if (uap->tptr) { |
| 2215 | error = copyin(uap->tptr, tv, sizeof(tv)); |
| 2216 | if (error) |
| 2217 | return (error); |
| 2218 | } |
| 2219 | |
| 2220 | error = kern_futimes(uap->fd, uap->tptr ? tv : NULL); |
| 2221 | |
| 2222 | return (error); |
| 2223 | } |
| 2224 | |
| 2225 | int |
| 2226 | kern_truncate(struct nameidata* nd, off_t length) |
| 2227 | { |
| 2228 | struct thread *td = curthread; |
| 2229 | struct proc *p = td->td_proc; |
| 2230 | struct vnode *vp; |
| 2231 | struct vattr vattr; |
| 2232 | int error; |
| 2233 | |
| 2234 | if (length < 0) |
| 2235 | return(EINVAL); |
| 2236 | if ((error = namei(nd)) != 0) |
| 2237 | return (error); |
| 2238 | vp = nd->ni_vp; |
| 2239 | NDFREE(nd, NDF_ONLY_PNBUF); |
| 2240 | VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE); |
| 2241 | vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td); |
| 2242 | if (vp->v_type == VDIR) |
| 2243 | error = EISDIR; |
| 2244 | else if ((error = vn_writechk(vp)) == 0 && |
| 2245 | (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, td)) == 0) { |
| 2246 | VATTR_NULL(&vattr); |
| 2247 | vattr.va_size = length; |
| 2248 | error = VOP_SETATTR(vp, &vattr, p->p_ucred, td); |
| 2249 | } |
| 2250 | vput(vp); |
| 2251 | return (error); |
| 2252 | } |
| 2253 | |
| 2254 | /* |
| 2255 | * truncate(char *path, int pad, off_t length) |
| 2256 | * |
| 2257 | * Truncate a file given its path name. |
| 2258 | */ |
| 2259 | int |
| 2260 | truncate(struct truncate_args *uap) |
| 2261 | { |
| 2262 | struct thread *td = curthread; |
| 2263 | struct nameidata nd; |
| 2264 | int error; |
| 2265 | |
| 2266 | NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, uap->path, td); |
| 2267 | |
| 2268 | error = kern_truncate(&nd, uap->length); |
| 2269 | |
| 2270 | return error; |
| 2271 | } |
| 2272 | |
| 2273 | int |
| 2274 | kern_ftruncate(int fd, off_t length) |
| 2275 | { |
| 2276 | struct thread *td = curthread; |
| 2277 | struct proc *p = td->td_proc; |
| 2278 | struct vattr vattr; |
| 2279 | struct vnode *vp; |
| 2280 | struct file *fp; |
| 2281 | int error; |
| 2282 | |
| 2283 | if (length < 0) |
| 2284 | return(EINVAL); |
| 2285 | if ((error = getvnode(p->p_fd, fd, &fp)) != 0) |
| 2286 | return (error); |
| 2287 | if ((fp->f_flag & FWRITE) == 0) |
| 2288 | return (EINVAL); |
| 2289 | vp = (struct vnode *)fp->f_data; |
| 2290 | VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE); |
| 2291 | vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td); |
| 2292 | if (vp->v_type == VDIR) |
| 2293 | error = EISDIR; |
| 2294 | else if ((error = vn_writechk(vp)) == 0) { |
| 2295 | VATTR_NULL(&vattr); |
| 2296 | vattr.va_size = length; |
| 2297 | error = VOP_SETATTR(vp, &vattr, fp->f_cred, td); |
| 2298 | } |
| 2299 | VOP_UNLOCK(vp, NULL, 0, td); |
| 2300 | return (error); |
| 2301 | } |
| 2302 | |
| 2303 | /* |
| 2304 | * ftruncate_args(int fd, int pad, off_t length) |
| 2305 | * |
| 2306 | * Truncate a file given a file descriptor. |
| 2307 | */ |
| 2308 | int |
| 2309 | ftruncate(struct ftruncate_args *uap) |
| 2310 | { |
| 2311 | int error; |
| 2312 | |
| 2313 | error = kern_ftruncate(uap->fd, uap->length); |
| 2314 | |
| 2315 | return (error); |
| 2316 | } |
| 2317 | |
| 2318 | /* |
| 2319 | * fsync(int fd) |
| 2320 | * |
| 2321 | * Sync an open file. |
| 2322 | */ |
| 2323 | /* ARGSUSED */ |
| 2324 | int |
| 2325 | fsync(struct fsync_args *uap) |
| 2326 | { |
| 2327 | struct thread *td = curthread; |
| 2328 | struct proc *p = td->td_proc; |
| 2329 | struct vnode *vp; |
| 2330 | struct file *fp; |
| 2331 | vm_object_t obj; |
| 2332 | int error; |
| 2333 | |
| 2334 | if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) |
| 2335 | return (error); |
| 2336 | vp = (struct vnode *)fp->f_data; |
| 2337 | vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td); |
| 2338 | if (VOP_GETVOBJECT(vp, &obj) == 0) |
| 2339 | vm_object_page_clean(obj, 0, 0, 0); |
| 2340 | if ((error = VOP_FSYNC(vp, MNT_WAIT, td)) == 0 && |
| 2341 | vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP) && |
| 2342 | bioops.io_fsync) |
| 2343 | error = (*bioops.io_fsync)(vp); |
| 2344 | VOP_UNLOCK(vp, NULL, 0, td); |
| 2345 | return (error); |
| 2346 | } |
| 2347 | |
| 2348 | int |
| 2349 | kern_rename(struct nameidata *fromnd, struct nameidata *tond) |
| 2350 | { |
| 2351 | struct thread *td = curthread; |
| 2352 | struct proc *p = td->td_proc; |
| 2353 | struct vnode *tvp, *fvp, *tdvp; |
| 2354 | int error; |
| 2355 | |
| 2356 | bwillwrite(); |
| 2357 | error = namei(fromnd); |
| 2358 | if (error) |
| 2359 | return (error); |
| 2360 | fvp = fromnd->ni_vp; |
| 2361 | if (fromnd->ni_vp->v_type == VDIR) |
| 2362 | tond->ni_cnd.cn_flags |= CNP_WILLBEDIR; |
| 2363 | error = namei(tond); |
| 2364 | if (error) { |
| 2365 | /* Translate error code for rename("dir1", "dir2/."). */ |
| 2366 | if (error == EISDIR && fvp->v_type == VDIR) |
| 2367 | error = EINVAL; |
| 2368 | NDFREE(fromnd, NDF_ONLY_PNBUF); |
| 2369 | vrele(fromnd->ni_dvp); |
| 2370 | vrele(fvp); |
| 2371 | goto out1; |
| 2372 | } |
| 2373 | tdvp = tond->ni_dvp; |
| 2374 | tvp = tond->ni_vp; |
| 2375 | if (tvp != NULL) { |
| 2376 | if (fvp->v_type == VDIR && tvp->v_type != VDIR) { |
| 2377 | error = ENOTDIR; |
| 2378 | goto out; |
| 2379 | } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { |
| 2380 | error = EISDIR; |
| 2381 | goto out; |
| 2382 | } |
| 2383 | } |
| 2384 | if (fvp == tdvp) |
| 2385 | error = EINVAL; |
| 2386 | /* |
| 2387 | * If the source is the same as the destination (that is, if they |
| 2388 | * are links to the same vnode), then there is nothing to do. |
| 2389 | */ |
| 2390 | if (fvp == tvp) |
| 2391 | error = -1; |
| 2392 | out: |
| 2393 | if (!error) { |
| 2394 | VOP_LEASE(tdvp, td, p->p_ucred, LEASE_WRITE); |
| 2395 | if (fromnd->ni_dvp != tdvp) { |
| 2396 | VOP_LEASE(fromnd->ni_dvp, td, p->p_ucred, LEASE_WRITE); |
| 2397 | } |
| 2398 | if (tvp) { |
| 2399 | VOP_LEASE(tvp, td, p->p_ucred, LEASE_WRITE); |
| 2400 | } |
| 2401 | error = VOP_RENAME(fromnd->ni_dvp, NCPNULL, fromnd->ni_vp, |
| 2402 | &fromnd->ni_cnd, tond->ni_dvp, NCPNULL, tond->ni_vp, |
| 2403 | &tond->ni_cnd); |
| 2404 | NDFREE(fromnd, NDF_ONLY_PNBUF); |
| 2405 | NDFREE(tond, NDF_ONLY_PNBUF); |
| 2406 | } else { |
| 2407 | NDFREE(fromnd, NDF_ONLY_PNBUF); |
| 2408 | NDFREE(tond, NDF_ONLY_PNBUF); |
| 2409 | if (tdvp == tvp) |
| 2410 | vrele(tdvp); |
| 2411 | else |
| 2412 | vput(tdvp); |
| 2413 | if (tvp) |
| 2414 | vput(tvp); |
| 2415 | vrele(fromnd->ni_dvp); |
| 2416 | vrele(fvp); |
| 2417 | } |
| 2418 | vrele(tond->ni_startdir); |
| 2419 | ASSERT_VOP_UNLOCKED(fromnd->ni_dvp, "rename"); |
| 2420 | ASSERT_VOP_UNLOCKED(fromnd->ni_vp, "rename"); |
| 2421 | ASSERT_VOP_UNLOCKED(tond->ni_dvp, "rename"); |
| 2422 | ASSERT_VOP_UNLOCKED(tond->ni_vp, "rename"); |
| 2423 | out1: |
| 2424 | if (fromnd->ni_startdir) |
| 2425 | vrele(fromnd->ni_startdir); |
| 2426 | if (error == -1) |
| 2427 | return (0); |
| 2428 | return (error); |
| 2429 | } |
| 2430 | |
| 2431 | /* |
| 2432 | * rename_args(char *from, char *to) |
| 2433 | * |
| 2434 | * Rename files. Source and destination must either both be directories, |
| 2435 | * or both not be directories. If target is a directory, it must be empty. |
| 2436 | */ |
| 2437 | int |
| 2438 | rename(struct rename_args *uap) |
| 2439 | { |
| 2440 | struct thread *td = curthread; |
| 2441 | struct nameidata fromnd, tond; |
| 2442 | int error; |
| 2443 | |
| 2444 | NDINIT(&fromnd, NAMEI_DELETE, CNP_WANTPARENT | CNP_SAVESTART, |
| 2445 | UIO_USERSPACE, uap->from, td); |
| 2446 | NDINIT(&tond, NAMEI_RENAME, |
| 2447 | CNP_LOCKPARENT | CNP_LOCKLEAF | CNP_NOCACHE | |
| 2448 | CNP_SAVESTART | CNP_NOOBJ, |
| 2449 | UIO_USERSPACE, uap->to, td); |
| 2450 | |
| 2451 | error = kern_rename(&fromnd, &tond); |
| 2452 | |
| 2453 | return (error); |
| 2454 | } |
| 2455 | |
| 2456 | int |
| 2457 | kern_mkdir(struct nameidata *nd, int mode) |
| 2458 | { |
| 2459 | struct thread *td = curthread; |
| 2460 | struct proc *p = td->td_proc; |
| 2461 | struct vnode *vp; |
| 2462 | struct vattr vattr; |
| 2463 | int error; |
| 2464 | |
| 2465 | bwillwrite(); |
| 2466 | nd->ni_cnd.cn_flags |= CNP_WILLBEDIR; |
| 2467 | error = namei(nd); |
| 2468 | if (error) |
| 2469 | return (error); |
| 2470 | vp = nd->ni_vp; |
| 2471 | if (vp) { |
| 2472 | NDFREE(nd, NDF_ONLY_PNBUF); |
| 2473 | if (nd->ni_dvp == vp) |
| 2474 | vrele(nd->ni_dvp); |
| 2475 | else |
| 2476 | vput(nd->ni_dvp); |
| 2477 | vrele(vp); |
| 2478 | return (EEXIST); |
| 2479 | } |
| 2480 | VATTR_NULL(&vattr); |
| 2481 | vattr.va_type = VDIR; |
| 2482 | vattr.va_mode = (mode & ACCESSPERMS) &~ p->p_fd->fd_cmask; |
| 2483 | VOP_LEASE(nd->ni_dvp, td, p->p_ucred, LEASE_WRITE); |
| 2484 | error = VOP_MKDIR(nd->ni_dvp, NCPNULL, &nd->ni_vp, &nd->ni_cnd, |
| 2485 | &vattr); |
| 2486 | NDFREE(nd, NDF_ONLY_PNBUF); |
| 2487 | vput(nd->ni_dvp); |
| 2488 | if (error == 0) |
| 2489 | vput(nd->ni_vp); |
| 2490 | ASSERT_VOP_UNLOCKED(nd->ni_dvp, "mkdir"); |
| 2491 | ASSERT_VOP_UNLOCKED(nd->ni_vp, "mkdir"); |
| 2492 | return (error); |
| 2493 | } |
| 2494 | |
| 2495 | /* |
| 2496 | * mkdir_args(char *path, int mode) |
| 2497 | * |
| 2498 | * Make a directory file. |
| 2499 | */ |
| 2500 | /* ARGSUSED */ |
| 2501 | int |
| 2502 | mkdir(struct mkdir_args *uap) |
| 2503 | { |
| 2504 | struct thread *td = curthread; |
| 2505 | struct nameidata nd; |
| 2506 | int error; |
| 2507 | |
| 2508 | NDINIT(&nd, NAMEI_CREATE, CNP_LOCKPARENT, UIO_USERSPACE, uap->path, |
| 2509 | td); |
| 2510 | |
| 2511 | error = kern_mkdir(&nd, uap->mode); |
| 2512 | |
| 2513 | return (error); |
| 2514 | } |
| 2515 | |
| 2516 | int |
| 2517 | kern_rmdir(struct nameidata *nd) |
| 2518 | { |
| 2519 | struct thread *td = curthread; |
| 2520 | struct proc *p = td->td_proc; |
| 2521 | struct vnode *vp; |
| 2522 | int error; |
| 2523 | |
| 2524 | bwillwrite(); |
| 2525 | error = namei(nd); |
| 2526 | if (error) |
| 2527 | return (error); |
| 2528 | vp = nd->ni_vp; |
| 2529 | if (vp->v_type != VDIR) { |
| 2530 | error = ENOTDIR; |
| 2531 | goto out; |
| 2532 | } |
| 2533 | /* |
| 2534 | * No rmdir "." please. |
| 2535 | */ |
| 2536 | if (nd->ni_dvp == vp) { |
| 2537 | error = EINVAL; |
| 2538 | goto out; |
| 2539 | } |
| 2540 | /* |
| 2541 | * The root of a mounted filesystem cannot be deleted. |
| 2542 | */ |
| 2543 | if (vp->v_flag & VROOT) |
| 2544 | error = EBUSY; |
| 2545 | else { |
| 2546 | VOP_LEASE(nd->ni_dvp, td, p->p_ucred, LEASE_WRITE); |
| 2547 | VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE); |
| 2548 | error = VOP_RMDIR(nd->ni_dvp, NCPNULL, nd->ni_vp, |
| 2549 | &nd->ni_cnd); |
| 2550 | } |
| 2551 | out: |
| 2552 | NDFREE(nd, NDF_ONLY_PNBUF); |
| 2553 | if (nd->ni_dvp == vp) |
| 2554 | vrele(nd->ni_dvp); |
| 2555 | else |
| 2556 | vput(nd->ni_dvp); |
| 2557 | if (vp != NULLVP) |
| 2558 | vput(vp); |
| 2559 | ASSERT_VOP_UNLOCKED(nd->ni_dvp, "rmdir"); |
| 2560 | ASSERT_VOP_UNLOCKED(nd->ni_vp, "rmdir"); |
| 2561 | return (error); |
| 2562 | } |
| 2563 | |
| 2564 | /* |
| 2565 | * rmdir_args(char *path) |
| 2566 | * |
| 2567 | * Remove a directory file. |
| 2568 | */ |
| 2569 | /* ARGSUSED */ |
| 2570 | int |
| 2571 | rmdir(struct rmdir_args *uap) |
| 2572 | { |
| 2573 | struct thread *td = curthread; |
| 2574 | struct nameidata nd; |
| 2575 | int error; |
| 2576 | |
| 2577 | NDINIT(&nd, NAMEI_DELETE, CNP_LOCKPARENT | CNP_LOCKLEAF, |
| 2578 | UIO_USERSPACE, uap->path, td); |
| 2579 | |
| 2580 | error = kern_rmdir(&nd); |
| 2581 | |
| 2582 | return (error); |
| 2583 | } |
| 2584 | |
| 2585 | int |
| 2586 | kern_getdirentries(int fd, char *buf, u_int count, long *basep, int *res) |
| 2587 | { |
| 2588 | struct thread *td = curthread; |
| 2589 | struct proc *p = td->td_proc; |
| 2590 | struct vnode *vp; |
| 2591 | struct file *fp; |
| 2592 | struct uio auio; |
| 2593 | struct iovec aiov; |
| 2594 | long loff; |
| 2595 | int error, eofflag; |
| 2596 | |
| 2597 | if ((error = getvnode(p->p_fd, fd, &fp)) != 0) |
| 2598 | return (error); |
| 2599 | if ((fp->f_flag & FREAD) == 0) |
| 2600 | return (EBADF); |
| 2601 | vp = (struct vnode *)fp->f_data; |
| 2602 | unionread: |
| 2603 | if (vp->v_type != VDIR) |
| 2604 | return (EINVAL); |
| 2605 | aiov.iov_base = buf; |
| 2606 | aiov.iov_len = count; |
| 2607 | auio.uio_iov = &aiov; |
| 2608 | auio.uio_iovcnt = 1; |
| 2609 | auio.uio_rw = UIO_READ; |
| 2610 | auio.uio_segflg = UIO_USERSPACE; |
| 2611 | auio.uio_td = td; |
| 2612 | auio.uio_resid = count; |
| 2613 | /* vn_lock(vp, NULL, LK_SHARED | LK_RETRY, td); */ |
| 2614 | vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td); |
| 2615 | loff = auio.uio_offset = fp->f_offset; |
| 2616 | error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, NULL); |
| 2617 | fp->f_offset = auio.uio_offset; |
| 2618 | VOP_UNLOCK(vp, NULL, 0, td); |
| 2619 | if (error) |
| 2620 | return (error); |
| 2621 | if (count == auio.uio_resid) { |
| 2622 | if (union_dircheckp) { |
| 2623 | error = union_dircheckp(td, &vp, fp); |
| 2624 | if (error == -1) |
| 2625 | goto unionread; |
| 2626 | if (error) |
| 2627 | return (error); |
| 2628 | } |
| 2629 | if ((vp->v_flag & VROOT) && |
| 2630 | (vp->v_mount->mnt_flag & MNT_UNION)) { |
| 2631 | struct vnode *tvp = vp; |
| 2632 | vp = vp->v_mount->mnt_vnodecovered; |
| 2633 | VREF(vp); |
| 2634 | fp->f_data = (caddr_t) vp; |
| 2635 | fp->f_offset = 0; |
| 2636 | vrele(tvp); |
| 2637 | goto unionread; |
| 2638 | } |
| 2639 | } |
| 2640 | if (basep) { |
| 2641 | *basep = loff; |
| 2642 | } |
| 2643 | *res = count - auio.uio_resid; |
| 2644 | return (error); |
| 2645 | } |
| 2646 | |
| 2647 | /* |
| 2648 | * getdirentries_args(int fd, char *buf, u_int conut, long *basep) |
| 2649 | * |
| 2650 | * Read a block of directory entries in a file system independent format. |
| 2651 | */ |
| 2652 | int |
| 2653 | getdirentries(struct getdirentries_args *uap) |
| 2654 | { |
| 2655 | long base; |
| 2656 | int error; |
| 2657 | |
| 2658 | error = kern_getdirentries(uap->fd, uap->buf, uap->count, &base, |
| 2659 | &uap->sysmsg_result); |
| 2660 | |
| 2661 | if (error == 0) |
| 2662 | error = copyout(&base, uap->basep, sizeof(*uap->basep)); |
| 2663 | return (error); |
| 2664 | } |
| 2665 | |
| 2666 | /* |
| 2667 | * getdents_args(int fd, char *buf, size_t count) |
| 2668 | */ |
| 2669 | int |
| 2670 | getdents(struct getdents_args *uap) |
| 2671 | { |
| 2672 | int error; |
| 2673 | |
| 2674 | error = kern_getdirentries(uap->fd, uap->buf, uap->count, NULL, |
| 2675 | &uap->sysmsg_result); |
| 2676 | |
| 2677 | return (error); |
| 2678 | } |
| 2679 | |
| 2680 | /* |
| 2681 | * umask(int newmask) |
| 2682 | * |
| 2683 | * Set the mode mask for creation of filesystem nodes. |
| 2684 | * |
| 2685 | * MP SAFE |
| 2686 | */ |
| 2687 | int |
| 2688 | umask(struct umask_args *uap) |
| 2689 | { |
| 2690 | struct thread *td = curthread; |
| 2691 | struct proc *p = td->td_proc; |
| 2692 | struct filedesc *fdp; |
| 2693 | |
| 2694 | fdp = p->p_fd; |
| 2695 | uap->sysmsg_result = fdp->fd_cmask; |
| 2696 | fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS; |
| 2697 | return (0); |
| 2698 | } |
| 2699 | |
| 2700 | /* |
| 2701 | * revoke(char *path) |
| 2702 | * |
| 2703 | * Void all references to file by ripping underlying filesystem |
| 2704 | * away from vnode. |
| 2705 | */ |
| 2706 | /* ARGSUSED */ |
| 2707 | int |
| 2708 | revoke(struct revoke_args *uap) |
| 2709 | { |
| 2710 | struct thread *td = curthread; |
| 2711 | struct proc *p = td->td_proc; |
| 2712 | struct vnode *vp; |
| 2713 | struct vattr vattr; |
| 2714 | int error; |
| 2715 | struct nameidata nd; |
| 2716 | |
| 2717 | NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, SCARG(uap, path), td); |
| 2718 | if ((error = namei(&nd)) != 0) |
| 2719 | return (error); |
| 2720 | vp = nd.ni_vp; |
| 2721 | NDFREE(&nd, NDF_ONLY_PNBUF); |
| 2722 | if (vp->v_type != VCHR && vp->v_type != VBLK) { |
| 2723 | error = EINVAL; |
| 2724 | goto out; |
| 2725 | } |
| 2726 | if ((error = VOP_GETATTR(vp, &vattr, td)) != 0) |
| 2727 | goto out; |
| 2728 | if (p->p_ucred->cr_uid != vattr.va_uid && |
| 2729 | (error = suser_cred(p->p_ucred, PRISON_ROOT))) |
| 2730 | goto out; |
| 2731 | if (vcount(vp) > 1) |
| 2732 | VOP_REVOKE(vp, REVOKEALL); |
| 2733 | out: |
| 2734 | vrele(vp); |
| 2735 | return (error); |
| 2736 | } |
| 2737 | |
| 2738 | /* |
| 2739 | * Convert a user file descriptor to a kernel file entry. |
| 2740 | */ |
| 2741 | int |
| 2742 | getvnode(struct filedesc *fdp, int fd, struct file **fpp) |
| 2743 | { |
| 2744 | struct file *fp; |
| 2745 | |
| 2746 | if ((u_int)fd >= fdp->fd_nfiles || |
| 2747 | (fp = fdp->fd_ofiles[fd]) == NULL) |
| 2748 | return (EBADF); |
| 2749 | if (fp->f_type != DTYPE_VNODE && fp->f_type != DTYPE_FIFO) |
| 2750 | return (EINVAL); |
| 2751 | *fpp = fp; |
| 2752 | return (0); |
| 2753 | } |
| 2754 | /* |
| 2755 | * getfh_args(char *fname, fhandle_t *fhp) |
| 2756 | * |
| 2757 | * Get (NFS) file handle |
| 2758 | */ |
| 2759 | int |
| 2760 | getfh(struct getfh_args *uap) |
| 2761 | { |
| 2762 | struct thread *td = curthread; |
| 2763 | struct nameidata nd; |
| 2764 | fhandle_t fh; |
| 2765 | struct vnode *vp; |
| 2766 | int error; |
| 2767 | |
| 2768 | /* |
| 2769 | * Must be super user |
| 2770 | */ |
| 2771 | error = suser(td); |
| 2772 | if (error) |
| 2773 | return (error); |
| 2774 | NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_LOCKLEAF, UIO_USERSPACE, uap->fname, td); |
| 2775 | error = namei(&nd); |
| 2776 | if (error) |
| 2777 | return (error); |
| 2778 | NDFREE(&nd, NDF_ONLY_PNBUF); |
| 2779 | vp = nd.ni_vp; |
| 2780 | bzero(&fh, sizeof(fh)); |
| 2781 | fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; |
| 2782 | error = VFS_VPTOFH(vp, &fh.fh_fid); |
| 2783 | vput(vp); |
| 2784 | if (error) |
| 2785 | return (error); |
| 2786 | error = copyout(&fh, uap->fhp, sizeof (fh)); |
| 2787 | return (error); |
| 2788 | } |
| 2789 | |
| 2790 | /* |
| 2791 | * fhopen_args(const struct fhandle *u_fhp, int flags) |
| 2792 | * |
| 2793 | * syscall for the rpc.lockd to use to translate a NFS file handle into |
| 2794 | * an open descriptor. |
| 2795 | * |
| 2796 | * warning: do not remove the suser() call or this becomes one giant |
| 2797 | * security hole. |
| 2798 | */ |
| 2799 | int |
| 2800 | fhopen(struct fhopen_args *uap) |
| 2801 | { |
| 2802 | struct thread *td = curthread; |
| 2803 | struct proc *p = td->td_proc; |
| 2804 | struct mount *mp; |
| 2805 | struct vnode *vp; |
| 2806 | struct fhandle fhp; |
| 2807 | struct vattr vat; |
| 2808 | struct vattr *vap = &vat; |
| 2809 | struct flock lf; |
| 2810 | struct file *fp; |
| 2811 | struct filedesc *fdp = p->p_fd; |
| 2812 | int fmode, mode, error, type; |
| 2813 | struct file *nfp; |
| 2814 | int indx; |
| 2815 | |
| 2816 | /* |
| 2817 | * Must be super user |
| 2818 | */ |
| 2819 | error = suser(td); |
| 2820 | if (error) |
| 2821 | return (error); |
| 2822 | |
| 2823 | fmode = FFLAGS(SCARG(uap, flags)); |
| 2824 | /* why not allow a non-read/write open for our lockd? */ |
| 2825 | if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT)) |
| 2826 | return (EINVAL); |
| 2827 | error = copyin(SCARG(uap,u_fhp), &fhp, sizeof(fhp)); |
| 2828 | if (error) |
| 2829 | return(error); |
| 2830 | /* find the mount point */ |
| 2831 | mp = vfs_getvfs(&fhp.fh_fsid); |
| 2832 | if (mp == NULL) |
| 2833 | return (ESTALE); |
| 2834 | /* now give me my vnode, it gets returned to me locked */ |
| 2835 | error = VFS_FHTOVP(mp, &fhp.fh_fid, &vp); |
| 2836 | if (error) |
| 2837 | return (error); |
| 2838 | /* |
| 2839 | * from now on we have to make sure not |
| 2840 | * to forget about the vnode |
| 2841 | * any error that causes an abort must vput(vp) |
| 2842 | * just set error = err and 'goto bad;'. |
| 2843 | */ |
| 2844 | |
| 2845 | /* |
| 2846 | * from vn_open |
| 2847 | */ |
| 2848 | if (vp->v_type == VLNK) { |
| 2849 | error = EMLINK; |
| 2850 | goto bad; |
| 2851 | } |
| 2852 | if (vp->v_type == VSOCK) { |
| 2853 | error = EOPNOTSUPP; |
| 2854 | goto bad; |
| 2855 | } |
| 2856 | mode = 0; |
| 2857 | if (fmode & (FWRITE | O_TRUNC)) { |
| 2858 | if (vp->v_type == VDIR) { |
| 2859 | error = EISDIR; |
| 2860 | goto bad; |
| 2861 | } |
| 2862 | error = vn_writechk(vp); |
| 2863 | if (error) |
| 2864 | goto bad; |
| 2865 | mode |= VWRITE; |
| 2866 | } |
| 2867 | if (fmode & FREAD) |
| 2868 | mode |= VREAD; |
| 2869 | if (mode) { |
| 2870 | error = VOP_ACCESS(vp, mode, p->p_ucred, td); |
| 2871 | if (error) |
| 2872 | goto bad; |
| 2873 | } |
| 2874 | if (fmode & O_TRUNC) { |
| 2875 | VOP_UNLOCK(vp, NULL, 0, td); /* XXX */ |
| 2876 | VOP_LEASE(vp, td, p->p_ucred, LEASE_WRITE); |
| 2877 | vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td); /* XXX */ |
| 2878 | VATTR_NULL(vap); |
| 2879 | vap->va_size = 0; |
| 2880 | error = VOP_SETATTR(vp, vap, p->p_ucred, td); |
| 2881 | if (error) |
| 2882 | goto bad; |
| 2883 | } |
| 2884 | error = VOP_OPEN(vp, fmode, p->p_ucred, td); |
| 2885 | if (error) |
| 2886 | goto bad; |
| 2887 | /* |
| 2888 | * Make sure that a VM object is created for VMIO support. |
| 2889 | */ |
| 2890 | if (vn_canvmio(vp) == TRUE) { |
| 2891 | if ((error = vfs_object_create(vp, td)) != 0) |
| 2892 | goto bad; |
| 2893 | } |
| 2894 | if (fmode & FWRITE) |
| 2895 | vp->v_writecount++; |
| 2896 | |
| 2897 | /* |
| 2898 | * end of vn_open code |
| 2899 | */ |
| 2900 | |
| 2901 | if ((error = falloc(p, &nfp, &indx)) != 0) { |
| 2902 | if (fmode & FWRITE) |
| 2903 | vp->v_writecount--; |
| 2904 | goto bad; |
| 2905 | } |
| 2906 | fp = nfp; |
| 2907 | |
| 2908 | /* |
| 2909 | * hold an extra reference to avoid having fp ripped out |
| 2910 | * from under us while we block in the lock op. |
| 2911 | */ |
| 2912 | fhold(fp); |
| 2913 | nfp->f_data = (caddr_t)vp; |
| 2914 | nfp->f_flag = fmode & FMASK; |
| 2915 | nfp->f_ops = &vnops; |
| 2916 | nfp->f_type = DTYPE_VNODE; |
| 2917 | if (fmode & (O_EXLOCK | O_SHLOCK)) { |
| 2918 | lf.l_whence = SEEK_SET; |
| 2919 | lf.l_start = 0; |
| 2920 | lf.l_len = 0; |
| 2921 | if (fmode & O_EXLOCK) |
| 2922 | lf.l_type = F_WRLCK; |
| 2923 | else |
| 2924 | lf.l_type = F_RDLCK; |
| 2925 | type = F_FLOCK; |
| 2926 | if ((fmode & FNONBLOCK) == 0) |
| 2927 | type |= F_WAIT; |
| 2928 | VOP_UNLOCK(vp, NULL, 0, td); |
| 2929 | if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0) { |
| 2930 | /* |
| 2931 | * lock request failed. Normally close the descriptor |
| 2932 | * but handle the case where someone might have dup()d |
| 2933 | * or close()d it when we weren't looking. |
| 2934 | */ |
| 2935 | if (fdp->fd_ofiles[indx] == fp) { |
| 2936 | fdp->fd_ofiles[indx] = NULL; |
| 2937 | fdrop(fp, td); |
| 2938 | } |
| 2939 | |
| 2940 | /* |
| 2941 | * release our private reference. |
| 2942 | */ |
| 2943 | fdrop(fp, td); |
| 2944 | return (error); |
| 2945 | } |
| 2946 | vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td); |
| 2947 | fp->f_flag |= FHASLOCK; |
| 2948 | } |
| 2949 | if ((vp->v_type == VREG) && (VOP_GETVOBJECT(vp, NULL) != 0)) |
| 2950 | vfs_object_create(vp, td); |
| 2951 | |
| 2952 | VOP_UNLOCK(vp, NULL, 0, td); |
| 2953 | fdrop(fp, td); |
| 2954 | uap->sysmsg_result = indx; |
| 2955 | return (0); |
| 2956 | |
| 2957 | bad: |
| 2958 | vput(vp); |
| 2959 | return (error); |
| 2960 | } |
| 2961 | |
| 2962 | /* |
| 2963 | * fhstat_args(struct fhandle *u_fhp, struct stat *sb) |
| 2964 | */ |
| 2965 | int |
| 2966 | fhstat(struct fhstat_args *uap) |
| 2967 | { |
| 2968 | struct thread *td = curthread; |
| 2969 | struct stat sb; |
| 2970 | fhandle_t fh; |
| 2971 | struct mount *mp; |
| 2972 | struct vnode *vp; |
| 2973 | int error; |
| 2974 | |
| 2975 | /* |
| 2976 | * Must be super user |
| 2977 | */ |
| 2978 | error = suser(td); |
| 2979 | if (error) |
| 2980 | return (error); |
| 2981 | |
| 2982 | error = copyin(SCARG(uap, u_fhp), &fh, sizeof(fhandle_t)); |
| 2983 | if (error) |
| 2984 | return (error); |
| 2985 | |
| 2986 | if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) |
| 2987 | return (ESTALE); |
| 2988 | if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) |
| 2989 | return (error); |
| 2990 | error = vn_stat(vp, &sb, td); |
| 2991 | vput(vp); |
| 2992 | if (error) |
| 2993 | return (error); |
| 2994 | error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); |
| 2995 | return (error); |
| 2996 | } |
| 2997 | |
| 2998 | /* |
| 2999 | * fhstatfs_args(struct fhandle *u_fhp, struct statfs *buf) |
| 3000 | */ |
| 3001 | int |
| 3002 | fhstatfs(struct fhstatfs_args *uap) |
| 3003 | { |
| 3004 | struct thread *td = curthread; |
| 3005 | struct statfs *sp; |
| 3006 | struct mount *mp; |
| 3007 | struct vnode *vp; |
| 3008 | struct statfs sb; |
| 3009 | fhandle_t fh; |
| 3010 | int error; |
| 3011 | |
| 3012 | /* |
| 3013 | * Must be super user |
| 3014 | */ |
| 3015 | if ((error = suser(td))) |
| 3016 | return (error); |
| 3017 | |
| 3018 | if ((error = copyin(SCARG(uap, u_fhp), &fh, sizeof(fhandle_t))) != 0) |
| 3019 | return (error); |
| 3020 | |
| 3021 | if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) |
| 3022 | return (ESTALE); |
| 3023 | if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) |
| 3024 | return (error); |
| 3025 | mp = vp->v_mount; |
| 3026 | sp = &mp->mnt_stat; |
| 3027 | vput(vp); |
| 3028 | if ((error = VFS_STATFS(mp, sp, td)) != 0) |
| 3029 | return (error); |
| 3030 | sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; |
| 3031 | if (suser(td)) { |
| 3032 | bcopy((caddr_t)sp, (caddr_t)&sb, sizeof(sb)); |
| 3033 | sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0; |
| 3034 | sp = &sb; |
| 3035 | } |
| 3036 | return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); |
| 3037 | } |
| 3038 | |
| 3039 | /* |
| 3040 | * Syscall to push extended attribute configuration information into the |
| 3041 | * VFS. Accepts a path, which it converts to a mountpoint, as well as |
| 3042 | * a command (int cmd), and attribute name and misc data. For now, the |
| 3043 | * attribute name is left in userspace for consumption by the VFS_op. |
| 3044 | * It will probably be changed to be copied into sysspace by the |
| 3045 | * syscall in the future, once issues with various consumers of the |
| 3046 | * attribute code have raised their hands. |
| 3047 | * |
| 3048 | * Currently this is used only by UFS Extended Attributes. |
| 3049 | */ |
| 3050 | int |
| 3051 | extattrctl(struct extattrctl_args *uap) |
| 3052 | { |
| 3053 | struct thread *td = curthread; |
| 3054 | struct nameidata nd; |
| 3055 | struct mount *mp; |
| 3056 | int error; |
| 3057 | |
| 3058 | NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, SCARG(uap, path), td); |
| 3059 | if ((error = namei(&nd)) != 0) |
| 3060 | return (error); |
| 3061 | mp = nd.ni_vp->v_mount; |
| 3062 | NDFREE(&nd, 0); |
| 3063 | return (VFS_EXTATTRCTL(mp, SCARG(uap, cmd), SCARG(uap, attrname), |
| 3064 | SCARG(uap, arg), td)); |
| 3065 | } |
| 3066 | |
| 3067 | /* |
| 3068 | * Syscall to set a named extended attribute on a file or directory. |
| 3069 | * Accepts attribute name, and a uio structure pointing to the data to set. |
| 3070 | * The uio is consumed in the style of writev(). The real work happens |
| 3071 | * in VOP_SETEXTATTR(). |
| 3072 | */ |
| 3073 | int |
| 3074 | extattr_set_file(struct extattr_set_file_args *uap) |
| 3075 | { |
| 3076 | struct thread *td = curthread; |
| 3077 | struct proc *p = td->td_proc; |
| 3078 | struct nameidata nd; |
| 3079 | struct uio auio; |
| 3080 | struct iovec *iov, *needfree = NULL, aiov[UIO_SMALLIOV]; |
| 3081 | char attrname[EXTATTR_MAXNAMELEN]; |
| 3082 | u_int iovlen, cnt; |
| 3083 | int error, i; |
| 3084 | |
| 3085 | error = copyin(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN); |
| 3086 | if (error) |
| 3087 | return (error); |
| 3088 | NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_LOCKLEAF, UIO_USERSPACE, |
| 3089 | SCARG(uap, path), td); |
| 3090 | if ((error = namei(&nd)) != 0) |
| 3091 | return(error); |
| 3092 | iovlen = uap->iovcnt * sizeof(struct iovec); |
| 3093 | if (uap->iovcnt > UIO_SMALLIOV) { |
| 3094 | if (uap->iovcnt > UIO_MAXIOV) { |
| 3095 | error = EINVAL; |
| 3096 | goto done; |
| 3097 | } |
| 3098 | MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK); |
| 3099 | needfree = iov; |
| 3100 | } else |
| 3101 | iov = aiov; |
| 3102 | auio.uio_iov = iov; |
| 3103 | auio.uio_iovcnt = uap->iovcnt; |
| 3104 | auio.uio_rw = UIO_WRITE; |
| 3105 | auio.uio_segflg = UIO_USERSPACE; |
| 3106 | auio.uio_td = td; |
| 3107 | auio.uio_offset = 0; |
| 3108 | if ((error = copyin((caddr_t)uap->iovp, (caddr_t)iov, iovlen))) |
| 3109 | goto done; |
| 3110 | auio.uio_resid = 0; |
| 3111 | for (i = 0; i < uap->iovcnt; i++) { |
| 3112 | if (iov->iov_len > INT_MAX - auio.uio_resid) { |
| 3113 | error = EINVAL; |
| 3114 | goto done; |
| 3115 | } |
| 3116 | auio.uio_resid += iov->iov_len; |
| 3117 | iov++; |
| 3118 | } |
| 3119 | cnt = auio.uio_resid; |
| 3120 | error = VOP_SETEXTATTR(nd.ni_vp, attrname, &auio, p->p_ucred, td); |
| 3121 | cnt -= auio.uio_resid; |
| 3122 | uap->sysmsg_result = cnt; |
| 3123 | done: |
| 3124 | if (needfree) |
| 3125 | FREE(needfree, M_IOV); |
| 3126 | NDFREE(&nd, 0); |
| 3127 | return (error); |
| 3128 | } |
| 3129 | |
| 3130 | /* |
| 3131 | * Syscall to get a named extended attribute on a file or directory. |
| 3132 | * Accepts attribute name, and a uio structure pointing to a buffer for the |
| 3133 | * data. The uio is consumed in the style of readv(). The real work |
| 3134 | * happens in VOP_GETEXTATTR(); |
| 3135 | */ |
| 3136 | int |
| 3137 | extattr_get_file(struct extattr_get_file_args *uap) |
| 3138 | { |
| 3139 | struct thread *td = curthread; |
| 3140 | struct proc *p = td->td_proc; |
| 3141 | struct nameidata nd; |
| 3142 | struct uio auio; |
| 3143 | struct iovec *iov, *needfree, aiov[UIO_SMALLIOV]; |
| 3144 | char attrname[EXTATTR_MAXNAMELEN]; |
| 3145 | u_int iovlen, cnt; |
| 3146 | int error, i; |
| 3147 | |
| 3148 | error = copyin(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN); |
| 3149 | if (error) |
| 3150 | return (error); |
| 3151 | NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_LOCKLEAF, UIO_USERSPACE, |
| 3152 | SCARG(uap, path), td); |
| 3153 | if ((error = namei(&nd)) != 0) |
| 3154 | return (error); |
| 3155 | iovlen = uap->iovcnt * sizeof (struct iovec); |
| 3156 | if (uap->iovcnt > UIO_SMALLIOV) { |
| 3157 | if (uap->iovcnt > UIO_MAXIOV) { |
| 3158 | NDFREE(&nd, 0); |
| 3159 | return (EINVAL); |
| 3160 | } |
| 3161 | MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK); |
| 3162 | needfree = iov; |
| 3163 | } else { |
| 3164 | iov = aiov; |
| 3165 | needfree = NULL; |
| 3166 | } |
| 3167 | auio.uio_iov = iov; |
| 3168 | auio.uio_iovcnt = uap->iovcnt; |
| 3169 | auio.uio_rw = UIO_READ; |
| 3170 | auio.uio_segflg = UIO_USERSPACE; |
| 3171 | auio.uio_td = td; |
| 3172 | auio.uio_offset = 0; |
| 3173 | if ((error = copyin((caddr_t)uap->iovp, (caddr_t)iov, iovlen))) |
| 3174 | goto done; |
| 3175 | auio.uio_resid = 0; |
| 3176 | for (i = 0; i < uap->iovcnt; i++) { |
| 3177 | if (iov->iov_len > INT_MAX - auio.uio_resid) { |
| 3178 | error = EINVAL; |
| 3179 | goto done; |
| 3180 | } |
| 3181 | auio.uio_resid += iov->iov_len; |
| 3182 | iov++; |
| 3183 | } |
| 3184 | cnt = auio.uio_resid; |
| 3185 | error = VOP_GETEXTATTR(nd.ni_vp, attrname, &auio, p->p_ucred, td); |
| 3186 | cnt -= auio.uio_resid; |
| 3187 | uap->sysmsg_result = cnt; |
| 3188 | done: |
| 3189 | if (needfree) |
| 3190 | FREE(needfree, M_IOV); |
| 3191 | NDFREE(&nd, 0); |
| 3192 | return(error); |
| 3193 | } |
| 3194 | |
| 3195 | /* |
| 3196 | * Syscall to delete a named extended attribute from a file or directory. |
| 3197 | * Accepts attribute name. The real work happens in VOP_SETEXTATTR(). |
| 3198 | */ |
| 3199 | int |
| 3200 | extattr_delete_file(struct extattr_delete_file_args *uap) |
| 3201 | { |
| 3202 | struct thread *td = curthread; |
| 3203 | struct proc *p = td->td_proc; |
| 3204 | struct nameidata nd; |
| 3205 | char attrname[EXTATTR_MAXNAMELEN]; |
| 3206 | int error; |
| 3207 | |
| 3208 | error = copyin(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN); |
| 3209 | if (error) |
| 3210 | return(error); |
| 3211 | NDINIT(&nd, NAMEI_LOOKUP, CNP_FOLLOW | CNP_LOCKLEAF, UIO_USERSPACE, |
| 3212 | SCARG(uap, path), td); |
| 3213 | if ((error = namei(&nd)) != 0) |
| 3214 | return(error); |
| 3215 | error = VOP_SETEXTATTR(nd.ni_vp, attrname, NULL, p->p_ucred, td); |
| 3216 | NDFREE(&nd, 0); |
| 3217 | return(error); |
| 3218 | } |