vfs_syscalls.c revision 1.158.2.1
1 /* $NetBSD: vfs_syscalls.c,v 1.158.2.1 2000/07/27 02:46:49 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)vfs_syscalls.c 8.42 (Berkeley) 7/31/95 41 */ 42 43 #include "opt_compat_netbsd.h" 44 #include "opt_compat_43.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/namei.h> 49 #include <sys/filedesc.h> 50 #include <sys/kernel.h> 51 #include <sys/file.h> 52 #include <sys/stat.h> 53 #include <sys/vnode.h> 54 #include <sys/mount.h> 55 #include <sys/proc.h> 56 #include <sys/uio.h> 57 #include <sys/malloc.h> 58 #include <sys/dirent.h> 59 60 #include <sys/syscallargs.h> 61 62 #include <vm/vm.h> 63 #include <sys/sysctl.h> 64 65 #include <miscfs/genfs/genfs.h> 66 #include <miscfs/syncfs/syncfs.h> 67 68 #include <uvm/uvm_extern.h> 69 70 static int change_dir __P((struct nameidata *, struct proc *)); 71 static int change_mode __P((struct vnode *, int, struct proc *p)); 72 static int change_owner __P((struct vnode *, uid_t, gid_t, struct proc *, 73 int)); 74 static int change_utimes __P((struct vnode *vp, const struct timeval *, 75 struct proc *p)); 76 static int rename_files __P((const char *, const char *, struct proc *, int)); 77 78 void checkdirs __P((struct vnode *)); 79 80 int dovfsusermount = 0; 81 82 /* 83 * Virtual File System System Calls 84 */ 85 86 /* 87 * Mount a file system. 88 */ 89 90 /* 91 * This table is used to maintain compatibility with 4.3BSD 92 * and NetBSD 0.9 mount syscalls. Note, the order is important! 93 * 94 * Also note that not all of these had actual numbers in 4.3BSD 95 * or NetBSD 0.9! 96 */ 97 const char *mountcompatnames[] = { 98 NULL, /* 0 = MOUNT_NONE */ 99 MOUNT_FFS, /* 1 */ 100 MOUNT_NFS, /* 2 */ 101 MOUNT_MFS, /* 3 */ 102 MOUNT_MSDOS, /* 4 */ 103 MOUNT_LFS, /* 5 */ 104 NULL, /* 6 = MOUNT_LOFS */ 105 MOUNT_FDESC, /* 7 */ 106 MOUNT_PORTAL, /* 8 */ 107 MOUNT_NULL, /* 9 */ 108 MOUNT_UMAP, /* 10 */ 109 MOUNT_KERNFS, /* 11 */ 110 MOUNT_PROCFS, /* 12 */ 111 MOUNT_AFS, /* 13 */ 112 MOUNT_CD9660, /* 14 = MOUNT_ISOFS */ 113 MOUNT_UNION, /* 15 */ 114 MOUNT_ADOSFS, /* 16 */ 115 MOUNT_EXT2FS, /* 17 */ 116 MOUNT_CODA, /* 18 */ 117 MOUNT_FILECORE, /* 19 */ 118 MOUNT_NTFS, /* 20 */ 119 }; 120 const int nmountcompatnames = sizeof(mountcompatnames) / 121 sizeof(mountcompatnames[0]); 122 123 /* ARGSUSED */ 124 int 125 sys_mount(p, v, retval) 126 struct proc *p; 127 void *v; 128 register_t *retval; 129 { 130 struct sys_mount_args /* { 131 syscallarg(const char *) type; 132 syscallarg(const char *) path; 133 syscallarg(int) flags; 134 syscallarg(void *) data; 135 } */ *uap = v; 136 struct vnode *vp; 137 struct mount *mp; 138 int error, flag = 0; 139 char fstypename[MFSNAMELEN]; 140 struct vattr va; 141 struct nameidata nd; 142 struct vfsops *vfs; 143 144 if (dovfsusermount == 0 && (error = suser(p->p_ucred, &p->p_acflag))) 145 return (error); 146 /* 147 * Get vnode to be covered 148 */ 149 NDINIT(&nd, LOOKUP, FOLLOW , UIO_USERSPACE, 150 SCARG(uap, path), p); 151 if ((error = namei(&nd)) != 0) 152 return (error); 153 vp = nd.ni_vp; 154 /* 155 * A lookup in VFS_MOUNT might result in an attempt to 156 * lock this vnode again, so make the lock resursive. 157 */ 158 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 159 if (SCARG(uap, flags) & MNT_UPDATE) { 160 if ((vp->v_flag & VROOT) == 0) { 161 vput(vp); 162 return (EINVAL); 163 } 164 mp = vp->v_mount; 165 flag = mp->mnt_flag; 166 vfs = mp->mnt_op; 167 /* 168 * We only allow the filesystem to be reloaded if it 169 * is currently mounted read-only. 170 */ 171 if ((SCARG(uap, flags) & MNT_RELOAD) && 172 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 173 vput(vp); 174 return (EOPNOTSUPP); /* Needs translation */ 175 } 176 /* 177 * In "highly secure" mode, don't let the caller do anything 178 * but downgrade a filesystem from read-write to read-only. 179 * (see also below; MNT_UPDATE is required.) 180 */ 181 if (securelevel >= 2 && 182 (SCARG(uap, flags) != 183 (mp->mnt_flag | MNT_RDONLY | 184 MNT_RELOAD | MNT_FORCE | MNT_UPDATE))) { 185 vput(vp); 186 return (EPERM); 187 } 188 mp->mnt_flag |= 189 SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); 190 /* 191 * Only root, or the user that did the original mount is 192 * permitted to update it. 193 */ 194 if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && 195 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 196 vput(vp); 197 return (error); 198 } 199 /* 200 * Do not allow NFS export by non-root users. For non-root 201 * users, silently enforce MNT_NOSUID and MNT_NODEV, and 202 * MNT_NOEXEC if mount point is already MNT_NOEXEC. 203 */ 204 if (p->p_ucred->cr_uid != 0) { 205 if (SCARG(uap, flags) & MNT_EXPORTED) { 206 vput(vp); 207 return (EPERM); 208 } 209 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 210 if (flag & MNT_NOEXEC) 211 SCARG(uap, flags) |= MNT_NOEXEC; 212 } 213 if (vfs_busy(mp, LK_NOWAIT, 0)) { 214 vput(vp); 215 return (EPERM); 216 } 217 VOP_UNLOCK(vp, 0); 218 goto update; 219 } else { 220 if (securelevel >= 2) { 221 vput(vp); 222 return (EPERM); 223 } 224 } 225 /* 226 * If the user is not root, ensure that they own the directory 227 * onto which we are attempting to mount. 228 */ 229 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 230 (va.va_uid != p->p_ucred->cr_uid && 231 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 232 vput(vp); 233 return (error); 234 } 235 /* 236 * Do not allow NFS export by non-root users. For non-root users, 237 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 238 * mount point is already MNT_NOEXEC. 239 */ 240 if (p->p_ucred->cr_uid != 0) { 241 if (SCARG(uap, flags) & MNT_EXPORTED) { 242 vput(vp); 243 return (EPERM); 244 } 245 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 246 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 247 SCARG(uap, flags) |= MNT_NOEXEC; 248 } 249 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 250 return (error); 251 if (vp->v_type != VDIR) { 252 vput(vp); 253 return (ENOTDIR); 254 } 255 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 256 if (error) { 257 #if defined(COMPAT_09) || defined(COMPAT_43) 258 /* 259 * Historically filesystem types were identified by number. 260 * If we get an integer for the filesystem type instead of a 261 * string, we check to see if it matches one of the historic 262 * filesystem types. 263 */ 264 u_long fsindex = (u_long)SCARG(uap, type); 265 if (fsindex >= nmountcompatnames || 266 mountcompatnames[fsindex] == NULL) { 267 vput(vp); 268 return (ENODEV); 269 } 270 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 271 #else 272 vput(vp); 273 return (error); 274 #endif 275 } 276 #ifdef COMPAT_10 277 /* Accept `ufs' as an alias for `ffs'. */ 278 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 279 strncpy(fstypename, "ffs", MFSNAMELEN); 280 #endif 281 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 282 vput(vp); 283 return (ENODEV); 284 } 285 if (vp->v_mountedhere != NULL) { 286 vput(vp); 287 return (EBUSY); 288 } 289 290 /* 291 * Allocate and initialize the file system. 292 */ 293 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 294 M_MOUNT, M_WAITOK); 295 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 296 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 297 (void)vfs_busy(mp, LK_NOWAIT, 0); 298 mp->mnt_op = vfs; 299 vfs->vfs_refcount++; 300 mp->mnt_vnodecovered = vp; 301 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 302 mp->mnt_unmounter = NULL; 303 update: 304 /* 305 * Set the mount level flags. 306 */ 307 if (SCARG(uap, flags) & MNT_RDONLY) 308 mp->mnt_flag |= MNT_RDONLY; 309 else if (mp->mnt_flag & MNT_RDONLY) 310 mp->mnt_flag |= MNT_WANTRDWR; 311 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 312 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 313 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP); 314 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 315 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 316 MNT_NOCOREDUMP | MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | 317 MNT_SOFTDEP); 318 /* 319 * Mount the filesystem. 320 */ 321 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 322 if (mp->mnt_flag & MNT_UPDATE) { 323 vrele(vp); 324 if (mp->mnt_flag & MNT_WANTRDWR) 325 mp->mnt_flag &= ~MNT_RDONLY; 326 mp->mnt_flag &=~ 327 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 328 if (error) 329 mp->mnt_flag = flag; 330 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { 331 if (mp->mnt_syncer == NULL) 332 error = vfs_allocate_syncvnode(mp); 333 } else { 334 if (mp->mnt_syncer != NULL) 335 vfs_deallocate_syncvnode(mp); 336 } 337 vfs_unbusy(mp); 338 return (error); 339 } 340 /* 341 * Put the new filesystem on the mount list after root. 342 */ 343 cache_purge(vp); 344 if (!error) { 345 vp->v_mountedhere = mp; 346 simple_lock(&mountlist_slock); 347 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 348 simple_unlock(&mountlist_slock); 349 checkdirs(vp); 350 VOP_UNLOCK(vp, 0); 351 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 352 error = vfs_allocate_syncvnode(mp); 353 vfs_unbusy(mp); 354 (void) VFS_STATFS(mp, &mp->mnt_stat, p); 355 if ((error = VFS_START(mp, 0, p))) 356 vrele(vp); 357 } else { 358 vp->v_mountedhere = (struct mount *)0; 359 vfs->vfs_refcount--; 360 vfs_unbusy(mp); 361 free((caddr_t)mp, M_MOUNT); 362 vput(vp); 363 } 364 return (error); 365 } 366 367 /* 368 * Scan all active processes to see if any of them have a current 369 * or root directory onto which the new filesystem has just been 370 * mounted. If so, replace them with the new mount point. 371 */ 372 void 373 checkdirs(olddp) 374 struct vnode *olddp; 375 { 376 struct cwdinfo *cwdi; 377 struct vnode *newdp; 378 struct proc *p; 379 380 if (olddp->v_usecount == 1) 381 return; 382 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 383 panic("mount: lost mount"); 384 proclist_lock_read(); 385 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 386 cwdi = p->p_cwdi; 387 if (cwdi->cwdi_cdir == olddp) { 388 vrele(cwdi->cwdi_cdir); 389 VREF(newdp); 390 cwdi->cwdi_cdir = newdp; 391 } 392 if (cwdi->cwdi_rdir == olddp) { 393 vrele(cwdi->cwdi_rdir); 394 VREF(newdp); 395 cwdi->cwdi_rdir = newdp; 396 } 397 } 398 proclist_unlock_read(); 399 if (rootvnode == olddp) { 400 vrele(rootvnode); 401 VREF(newdp); 402 rootvnode = newdp; 403 } 404 vput(newdp); 405 } 406 407 /* 408 * Unmount a file system. 409 * 410 * Note: unmount takes a path to the vnode mounted on as argument, 411 * not special file (as before). 412 */ 413 /* ARGSUSED */ 414 int 415 sys_unmount(p, v, retval) 416 struct proc *p; 417 void *v; 418 register_t *retval; 419 { 420 struct sys_unmount_args /* { 421 syscallarg(const char *) path; 422 syscallarg(int) flags; 423 } */ *uap = v; 424 struct vnode *vp; 425 struct mount *mp; 426 int error; 427 struct nameidata nd; 428 429 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 430 SCARG(uap, path), p); 431 if ((error = namei(&nd)) != 0) 432 return (error); 433 vp = nd.ni_vp; 434 mp = vp->v_mount; 435 436 /* 437 * Only root, or the user that did the original mount is 438 * permitted to unmount this filesystem. 439 */ 440 if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && 441 (error = suser(p->p_ucred, &p->p_acflag)) != 0) { 442 vput(vp); 443 return (error); 444 } 445 446 /* 447 * Don't allow unmounting the root file system. 448 */ 449 if (mp->mnt_flag & MNT_ROOTFS) { 450 vput(vp); 451 return (EINVAL); 452 } 453 454 /* 455 * Must be the root of the filesystem 456 */ 457 if ((vp->v_flag & VROOT) == 0) { 458 vput(vp); 459 return (EINVAL); 460 } 461 vput(vp); 462 463 if (vfs_busy(mp, 0, 0)) 464 return (EBUSY); 465 466 return (dounmount(mp, SCARG(uap, flags), p)); 467 } 468 469 /* 470 * Do the actual file system unmount. File system is assumed to have been 471 * marked busy by the caller. 472 */ 473 int 474 dounmount(mp, flags, p) 475 struct mount *mp; 476 int flags; 477 struct proc *p; 478 { 479 struct vnode *coveredvp; 480 int error; 481 int async; 482 483 simple_lock(&mountlist_slock); 484 vfs_unbusy(mp); 485 /* 486 * XXX Freeze syncer. This should really be done on a mountpoint 487 * basis, but especially the softdep code possibly called from 488 * the syncer doesn't exactly work on a per-mountpoint basis, 489 * so the softdep code would become a maze of vfs_busy calls. 490 */ 491 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 492 493 mp->mnt_flag |= MNT_UNMOUNT; 494 mp->mnt_unmounter = p; 495 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 496 if (mp->mnt_flag & MNT_EXPUBLIC) 497 vfs_setpublicfs(NULL, NULL, NULL); 498 async = mp->mnt_flag & MNT_ASYNC; 499 mp->mnt_flag &= ~MNT_ASYNC; 500 cache_purgevfs(mp); /* remove cache entries for this file sys */ 501 if (mp->mnt_syncer != NULL) 502 vfs_deallocate_syncvnode(mp); 503 if (((mp->mnt_flag & MNT_RDONLY) || 504 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 505 (flags & MNT_FORCE)) 506 error = VFS_UNMOUNT(mp, flags, p); 507 simple_lock(&mountlist_slock); 508 if (error) { 509 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 510 (void) vfs_allocate_syncvnode(mp); 511 mp->mnt_flag &= ~MNT_UNMOUNT; 512 mp->mnt_unmounter = NULL; 513 mp->mnt_flag |= async; 514 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 515 &mountlist_slock); 516 lockmgr(&syncer_lock, LK_RELEASE, NULL); 517 while (mp->mnt_wcnt > 0) { 518 wakeup((caddr_t)mp); 519 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 0); 520 } 521 return (error); 522 } 523 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 524 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 525 coveredvp->v_mountedhere = NULL; 526 vrele(coveredvp); 527 } 528 mp->mnt_op->vfs_refcount--; 529 if (mp->mnt_vnodelist.lh_first != NULL) 530 panic("unmount: dangling vnode"); 531 mp->mnt_flag |= MNT_GONE; 532 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 533 lockmgr(&syncer_lock, LK_RELEASE, NULL); 534 while(mp->mnt_wcnt > 0) { 535 wakeup((caddr_t)mp); 536 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0); 537 } 538 free((caddr_t)mp, M_MOUNT); 539 return (0); 540 } 541 542 /* 543 * Sync each mounted filesystem. 544 */ 545 #ifdef DEBUG 546 int syncprt = 0; 547 struct ctldebug debug0 = { "syncprt", &syncprt }; 548 #endif 549 550 /* ARGSUSED */ 551 int 552 sys_sync(p, v, retval) 553 struct proc *p; 554 void *v; 555 register_t *retval; 556 { 557 struct mount *mp, *nmp; 558 int asyncflag; 559 560 simple_lock(&mountlist_slock); 561 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 562 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 563 nmp = mp->mnt_list.cqe_prev; 564 continue; 565 } 566 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 567 asyncflag = mp->mnt_flag & MNT_ASYNC; 568 mp->mnt_flag &= ~MNT_ASYNC; 569 uvm_vnp_sync(mp); 570 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 571 if (asyncflag) 572 mp->mnt_flag |= MNT_ASYNC; 573 } 574 simple_lock(&mountlist_slock); 575 nmp = mp->mnt_list.cqe_prev; 576 vfs_unbusy(mp); 577 578 } 579 simple_unlock(&mountlist_slock); 580 #ifdef DEBUG 581 if (syncprt) 582 vfs_bufstats(); 583 #endif /* DEBUG */ 584 return (0); 585 } 586 587 /* 588 * Change filesystem quotas. 589 */ 590 /* ARGSUSED */ 591 int 592 sys_quotactl(p, v, retval) 593 struct proc *p; 594 void *v; 595 register_t *retval; 596 { 597 struct sys_quotactl_args /* { 598 syscallarg(const char *) path; 599 syscallarg(int) cmd; 600 syscallarg(int) uid; 601 syscallarg(caddr_t) arg; 602 } */ *uap = v; 603 struct mount *mp; 604 int error; 605 struct nameidata nd; 606 607 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 608 if ((error = namei(&nd)) != 0) 609 return (error); 610 mp = nd.ni_vp->v_mount; 611 vrele(nd.ni_vp); 612 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 613 SCARG(uap, arg), p)); 614 } 615 616 /* 617 * Get filesystem statistics. 618 */ 619 /* ARGSUSED */ 620 int 621 sys_statfs(p, v, retval) 622 struct proc *p; 623 void *v; 624 register_t *retval; 625 { 626 struct sys_statfs_args /* { 627 syscallarg(const char *) path; 628 syscallarg(struct statfs *) buf; 629 } */ *uap = v; 630 struct mount *mp; 631 struct statfs *sp; 632 int error; 633 struct nameidata nd; 634 635 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 636 if ((error = namei(&nd)) != 0) 637 return (error); 638 mp = nd.ni_vp->v_mount; 639 sp = &mp->mnt_stat; 640 vrele(nd.ni_vp); 641 if ((error = VFS_STATFS(mp, sp, p)) != 0) 642 return (error); 643 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 644 sp->f_oflags = sp->f_flags & 0xffff; 645 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 646 } 647 648 /* 649 * Get filesystem statistics. 650 */ 651 /* ARGSUSED */ 652 int 653 sys_fstatfs(p, v, retval) 654 struct proc *p; 655 void *v; 656 register_t *retval; 657 { 658 struct sys_fstatfs_args /* { 659 syscallarg(int) fd; 660 syscallarg(struct statfs *) buf; 661 } */ *uap = v; 662 struct file *fp; 663 struct mount *mp; 664 struct statfs *sp; 665 int error; 666 667 /* getvnode() will use the descriptor for us */ 668 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 669 return (error); 670 mp = ((struct vnode *)fp->f_data)->v_mount; 671 sp = &mp->mnt_stat; 672 if ((error = VFS_STATFS(mp, sp, p)) != 0) 673 goto out; 674 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 675 sp->f_oflags = sp->f_flags & 0xffff; 676 error = copyout(sp, SCARG(uap, buf), sizeof(*sp)); 677 out: 678 FILE_UNUSE(fp, p); 679 return (error); 680 } 681 682 /* 683 * Get statistics on all filesystems. 684 */ 685 int 686 sys_getfsstat(p, v, retval) 687 struct proc *p; 688 void *v; 689 register_t *retval; 690 { 691 struct sys_getfsstat_args /* { 692 syscallarg(struct statfs *) buf; 693 syscallarg(long) bufsize; 694 syscallarg(int) flags; 695 } */ *uap = v; 696 struct mount *mp, *nmp; 697 struct statfs *sp; 698 caddr_t sfsp; 699 long count, maxcount, error; 700 701 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 702 sfsp = (caddr_t)SCARG(uap, buf); 703 simple_lock(&mountlist_slock); 704 count = 0; 705 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 706 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 707 nmp = mp->mnt_list.cqe_next; 708 continue; 709 } 710 if (sfsp && count < maxcount) { 711 sp = &mp->mnt_stat; 712 /* 713 * If MNT_NOWAIT or MNT_LAZY is specified, do not 714 * refresh the fsstat cache. MNT_WAIT or MNT_LAXY 715 * overrides MNT_NOWAIT. 716 */ 717 if (SCARG(uap, flags) != MNT_NOWAIT && 718 SCARG(uap, flags) != MNT_LAZY && 719 (SCARG(uap, flags) == MNT_WAIT || 720 SCARG(uap, flags) == 0) && 721 (error = VFS_STATFS(mp, sp, p)) != 0) { 722 simple_lock(&mountlist_slock); 723 nmp = mp->mnt_list.cqe_next; 724 vfs_unbusy(mp); 725 continue; 726 } 727 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 728 sp->f_oflags = sp->f_flags & 0xffff; 729 error = copyout(sp, sfsp, sizeof(*sp)); 730 if (error) { 731 vfs_unbusy(mp); 732 return (error); 733 } 734 sfsp += sizeof(*sp); 735 } 736 count++; 737 simple_lock(&mountlist_slock); 738 nmp = mp->mnt_list.cqe_next; 739 vfs_unbusy(mp); 740 } 741 simple_unlock(&mountlist_slock); 742 if (sfsp && count > maxcount) 743 *retval = maxcount; 744 else 745 *retval = count; 746 return (0); 747 } 748 749 /* 750 * Change current working directory to a given file descriptor. 751 */ 752 /* ARGSUSED */ 753 int 754 sys_fchdir(p, v, retval) 755 struct proc *p; 756 void *v; 757 register_t *retval; 758 { 759 struct sys_fchdir_args /* { 760 syscallarg(int) fd; 761 } */ *uap = v; 762 struct filedesc *fdp = p->p_fd; 763 struct cwdinfo *cwdi = p->p_cwdi; 764 struct vnode *vp, *tdp; 765 struct mount *mp; 766 struct file *fp; 767 int error; 768 769 /* getvnode() will use the descriptor for us */ 770 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 771 return (error); 772 vp = (struct vnode *)fp->f_data; 773 774 VREF(vp); 775 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 776 if (vp->v_type != VDIR) 777 error = ENOTDIR; 778 else 779 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 780 while (!error && (mp = vp->v_mountedhere) != NULL) { 781 if (vfs_busy(mp, 0, 0)) 782 continue; 783 error = VFS_ROOT(mp, &tdp); 784 vfs_unbusy(mp); 785 if (error) 786 break; 787 vput(vp); 788 vp = tdp; 789 } 790 if (error) { 791 vput(vp); 792 goto out; 793 } 794 VOP_UNLOCK(vp, 0); 795 796 /* 797 * Disallow changing to a directory not under the process's 798 * current root directory (if there is one). 799 */ 800 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 801 vrele(vp); 802 error = EPERM; /* operation not permitted */ 803 goto out; 804 } 805 806 vrele(cwdi->cwdi_cdir); 807 cwdi->cwdi_cdir = vp; 808 out: 809 FILE_UNUSE(fp, p); 810 return (error); 811 } 812 813 /* 814 * Change this process's notion of the root directory to a given file descriptor. 815 */ 816 817 int 818 sys_fchroot(p, v, retval) 819 struct proc *p; 820 void *v; 821 register_t *retval; 822 { 823 struct sys_fchroot_args *uap = v; 824 struct filedesc *fdp = p->p_fd; 825 struct cwdinfo *cwdi = p->p_cwdi; 826 struct vnode *vp; 827 struct file *fp; 828 int error; 829 830 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 831 return error; 832 /* getvnode() will use the descriptor for us */ 833 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 834 return error; 835 vp = (struct vnode *) fp->f_data; 836 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 837 if (vp->v_type != VDIR) 838 error = ENOTDIR; 839 else 840 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 841 VOP_UNLOCK(vp, 0); 842 if (error) 843 goto out; 844 VREF(vp); 845 846 /* 847 * Prevent escaping from chroot by putting the root under 848 * the working directory. Silently chdir to / if we aren't 849 * already there. 850 */ 851 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 852 /* 853 * XXX would be more failsafe to change directory to a 854 * deadfs node here instead 855 */ 856 vrele(cwdi->cwdi_cdir); 857 VREF(vp); 858 cwdi->cwdi_cdir = vp; 859 } 860 861 if (cwdi->cwdi_rdir != NULL) 862 vrele(cwdi->cwdi_rdir); 863 cwdi->cwdi_rdir = vp; 864 out: 865 FILE_UNUSE(fp, p); 866 return (error); 867 } 868 869 870 871 /* 872 * Change current working directory (``.''). 873 */ 874 /* ARGSUSED */ 875 int 876 sys_chdir(p, v, retval) 877 struct proc *p; 878 void *v; 879 register_t *retval; 880 { 881 struct sys_chdir_args /* { 882 syscallarg(const char *) path; 883 } */ *uap = v; 884 struct cwdinfo *cwdi = p->p_cwdi; 885 int error; 886 struct nameidata nd; 887 888 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 889 SCARG(uap, path), p); 890 if ((error = change_dir(&nd, p)) != 0) 891 return (error); 892 vrele(cwdi->cwdi_cdir); 893 cwdi->cwdi_cdir = nd.ni_vp; 894 return (0); 895 } 896 897 /* 898 * Change notion of root (``/'') directory. 899 */ 900 /* ARGSUSED */ 901 int 902 sys_chroot(p, v, retval) 903 struct proc *p; 904 void *v; 905 register_t *retval; 906 { 907 struct sys_chroot_args /* { 908 syscallarg(const char *) path; 909 } */ *uap = v; 910 struct cwdinfo *cwdi = p->p_cwdi; 911 struct vnode *vp; 912 int error; 913 struct nameidata nd; 914 915 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 916 return (error); 917 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 918 SCARG(uap, path), p); 919 if ((error = change_dir(&nd, p)) != 0) 920 return (error); 921 if (cwdi->cwdi_rdir != NULL) 922 vrele(cwdi->cwdi_rdir); 923 vp = nd.ni_vp; 924 cwdi->cwdi_rdir = vp; 925 926 /* 927 * Prevent escaping from chroot by putting the root under 928 * the working directory. Silently chdir to / if we aren't 929 * already there. 930 */ 931 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 932 /* 933 * XXX would be more failsafe to change directory to a 934 * deadfs node here instead 935 */ 936 vrele(cwdi->cwdi_cdir); 937 VREF(vp); 938 cwdi->cwdi_cdir = vp; 939 } 940 941 return (0); 942 } 943 944 /* 945 * Common routine for chroot and chdir. 946 */ 947 static int 948 change_dir(ndp, p) 949 struct nameidata *ndp; 950 struct proc *p; 951 { 952 struct vnode *vp; 953 int error; 954 955 if ((error = namei(ndp)) != 0) 956 return (error); 957 vp = ndp->ni_vp; 958 if (vp->v_type != VDIR) 959 error = ENOTDIR; 960 else 961 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 962 963 if (error) 964 vput(vp); 965 else 966 VOP_UNLOCK(vp, 0); 967 return (error); 968 } 969 970 /* 971 * Check permissions, allocate an open file structure, 972 * and call the device open routine if any. 973 */ 974 int 975 sys_open(p, v, retval) 976 struct proc *p; 977 void *v; 978 register_t *retval; 979 { 980 struct sys_open_args /* { 981 syscallarg(const char *) path; 982 syscallarg(int) flags; 983 syscallarg(int) mode; 984 } */ *uap = v; 985 struct cwdinfo *cwdi = p->p_cwdi; 986 struct filedesc *fdp = p->p_fd; 987 struct file *fp; 988 struct vnode *vp; 989 int flags, cmode; 990 int type, indx, error; 991 struct flock lf; 992 struct nameidata nd; 993 994 flags = FFLAGS(SCARG(uap, flags)); 995 if ((flags & (FREAD | FWRITE)) == 0) 996 return (EINVAL); 997 /* falloc() will use the file descriptor for us */ 998 if ((error = falloc(p, &fp, &indx)) != 0) 999 return (error); 1000 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1001 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1002 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 1003 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1004 FILE_UNUSE(fp, p); 1005 ffree(fp); 1006 if ((error == ENODEV || error == ENXIO) && 1007 p->p_dupfd >= 0 && /* XXX from fdopen */ 1008 (error = 1009 dupfdopen(p, indx, p->p_dupfd, flags, error)) == 0) { 1010 *retval = indx; 1011 return (0); 1012 } 1013 if (error == ERESTART) 1014 error = EINTR; 1015 fdremove(fdp, indx); 1016 return (error); 1017 } 1018 p->p_dupfd = 0; 1019 vp = nd.ni_vp; 1020 fp->f_flag = flags & FMASK; 1021 fp->f_type = DTYPE_VNODE; 1022 fp->f_ops = &vnops; 1023 fp->f_data = (caddr_t)vp; 1024 if (flags & (O_EXLOCK | O_SHLOCK)) { 1025 lf.l_whence = SEEK_SET; 1026 lf.l_start = 0; 1027 lf.l_len = 0; 1028 if (flags & O_EXLOCK) 1029 lf.l_type = F_WRLCK; 1030 else 1031 lf.l_type = F_RDLCK; 1032 type = F_FLOCK; 1033 if ((flags & FNONBLOCK) == 0) 1034 type |= F_WAIT; 1035 VOP_UNLOCK(vp, 0); 1036 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1037 if (error) { 1038 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1039 FILE_UNUSE(fp, p); 1040 ffree(fp); 1041 fdremove(fdp, indx); 1042 return (error); 1043 } 1044 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1045 fp->f_flag |= FHASLOCK; 1046 } 1047 VOP_UNLOCK(vp, 0); 1048 *retval = indx; 1049 FILE_UNUSE(fp, p); 1050 return (0); 1051 } 1052 1053 /* 1054 * Get file handle system call 1055 */ 1056 int 1057 sys_getfh(p, v, retval) 1058 struct proc *p; 1059 void *v; 1060 register_t *retval; 1061 { 1062 struct sys_getfh_args /* { 1063 syscallarg(char *) fname; 1064 syscallarg(fhandle_t *) fhp; 1065 } */ *uap = v; 1066 struct vnode *vp; 1067 fhandle_t fh; 1068 int error; 1069 struct nameidata nd; 1070 1071 /* 1072 * Must be super user 1073 */ 1074 error = suser(p->p_ucred, &p->p_acflag); 1075 if (error) 1076 return (error); 1077 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1078 SCARG(uap, fname), p); 1079 error = namei(&nd); 1080 if (error) 1081 return (error); 1082 vp = nd.ni_vp; 1083 memset((caddr_t)&fh, 0, sizeof(fh)); 1084 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1085 error = VFS_VPTOFH(vp, &fh.fh_fid); 1086 vput(vp); 1087 if (error) 1088 return (error); 1089 error = copyout((caddr_t)&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1090 return (error); 1091 } 1092 1093 /* 1094 * Open a file given a file handle. 1095 * 1096 * Check permissions, allocate an open file structure, 1097 * and call the device open routine if any. 1098 */ 1099 int 1100 sys_fhopen(p, v, retval) 1101 struct proc *p; 1102 void *v; 1103 register_t *retval; 1104 { 1105 struct sys_fhopen_args /* { 1106 syscallarg(const fhandle_t *) fhp; 1107 syscallarg(int) flags; 1108 } */ *uap = v; 1109 struct filedesc *fdp = p->p_fd; 1110 struct file *fp; 1111 struct vnode *vp = NULL; 1112 struct mount *mp; 1113 struct ucred *cred = p->p_ucred; 1114 int flags; 1115 struct file *nfp; 1116 int type, indx, error=0; 1117 struct flock lf; 1118 struct vattr va; 1119 fhandle_t fh; 1120 1121 /* 1122 * Must be super user 1123 */ 1124 if ((error = suser(p->p_ucred, &p->p_acflag))) 1125 return (error); 1126 1127 flags = FFLAGS(SCARG(uap, flags)); 1128 if ((flags & (FREAD | FWRITE)) == 0) 1129 return (EINVAL); 1130 if ((flags & O_CREAT)) 1131 return (EINVAL); 1132 /* falloc() will use the file descriptor for us */ 1133 if ((error = falloc(p, &nfp, &indx)) != 0) 1134 return (error); 1135 fp = nfp; 1136 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1137 goto bad; 1138 1139 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1140 error = ESTALE; 1141 goto bad; 1142 } 1143 1144 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1145 vp = NULL; /* most likely unnecessary sanity for bad: */ 1146 goto bad; 1147 } 1148 1149 /* Now do an effective vn_open */ 1150 1151 if (vp->v_type == VSOCK) { 1152 error = EOPNOTSUPP; 1153 goto bad; 1154 } 1155 if (flags & FREAD) { 1156 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1157 goto bad; 1158 } 1159 if (flags & (FWRITE | O_TRUNC)) { 1160 if (vp->v_type == VDIR) { 1161 error = EISDIR; 1162 goto bad; 1163 } 1164 if ((error = vn_writechk(vp)) != 0 || 1165 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1166 goto bad; 1167 } 1168 if (flags & O_TRUNC) { 1169 VOP_UNLOCK(vp, 0); /* XXX */ 1170 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1171 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1172 VATTR_NULL(&va); 1173 va.va_size = 0; 1174 if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0) 1175 goto bad; 1176 } 1177 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1178 goto bad; 1179 if (flags & FWRITE) 1180 vp->v_writecount++; 1181 1182 /* done with modified vn_open, now finish what sys_open does. */ 1183 1184 fp->f_flag = flags & FMASK; 1185 fp->f_type = DTYPE_VNODE; 1186 fp->f_ops = &vnops; 1187 fp->f_data = (caddr_t)vp; 1188 if (flags & (O_EXLOCK | O_SHLOCK)) { 1189 lf.l_whence = SEEK_SET; 1190 lf.l_start = 0; 1191 lf.l_len = 0; 1192 if (flags & O_EXLOCK) 1193 lf.l_type = F_WRLCK; 1194 else 1195 lf.l_type = F_RDLCK; 1196 type = F_FLOCK; 1197 if ((flags & FNONBLOCK) == 0) 1198 type |= F_WAIT; 1199 VOP_UNLOCK(vp, 0); 1200 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1201 if (error) { 1202 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1203 FILE_UNUSE(fp, p); 1204 ffree(fp); 1205 fdremove(fdp, indx); 1206 return (error); 1207 } 1208 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1209 fp->f_flag |= FHASLOCK; 1210 } 1211 VOP_UNLOCK(vp, 0); 1212 *retval = indx; 1213 FILE_UNUSE(fp, p); 1214 return (0); 1215 1216 bad: 1217 FILE_UNUSE(fp, p); 1218 ffree(fp); 1219 fdremove(fdp, indx); 1220 if (vp != NULL) 1221 vput(vp); 1222 return (error); 1223 } 1224 1225 /* ARGSUSED */ 1226 int 1227 sys_fhstat(p, v, retval) 1228 struct proc *p; 1229 void *v; 1230 register_t *retval; 1231 { 1232 struct sys_fhstat_args /* { 1233 syscallarg(const fhandle_t *) fhp; 1234 syscallarg(struct stat *) sb; 1235 } */ *uap = v; 1236 struct stat sb; 1237 int error; 1238 fhandle_t fh; 1239 struct mount *mp; 1240 struct vnode *vp; 1241 1242 /* 1243 * Must be super user 1244 */ 1245 if ((error = suser(p->p_ucred, &p->p_acflag))) 1246 return (error); 1247 1248 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1249 return (error); 1250 1251 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1252 return (ESTALE); 1253 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1254 return (error); 1255 error = vn_stat(vp, &sb, p); 1256 vput(vp); 1257 if (error) 1258 return (error); 1259 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1260 return (error); 1261 } 1262 1263 /* ARGSUSED */ 1264 int 1265 sys_fhstatfs(p, v, retval) 1266 struct proc *p; 1267 void *v; 1268 register_t *retval; 1269 { 1270 struct sys_fhstatfs_args /* 1271 syscallarg(const fhandle_t *) fhp; 1272 syscallarg(struct statfs *) buf; 1273 } */ *uap = v; 1274 struct statfs sp; 1275 fhandle_t fh; 1276 struct mount *mp; 1277 struct vnode *vp; 1278 int error; 1279 1280 /* 1281 * Must be super user 1282 */ 1283 if ((error = suser(p->p_ucred, &p->p_acflag))) 1284 return (error); 1285 1286 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1287 return (error); 1288 1289 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1290 return (ESTALE); 1291 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1292 return (error); 1293 mp = vp->v_mount; 1294 vput(vp); 1295 if ((error = VFS_STATFS(mp, &sp, p)) != 0) 1296 return (error); 1297 sp.f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1298 sp.f_oflags = sp.f_flags & 0xffff; 1299 return (copyout(&sp, SCARG(uap, buf), sizeof(sp))); 1300 } 1301 1302 /* 1303 * Create a special file. 1304 */ 1305 /* ARGSUSED */ 1306 int 1307 sys_mknod(p, v, retval) 1308 struct proc *p; 1309 void *v; 1310 register_t *retval; 1311 { 1312 struct sys_mknod_args /* { 1313 syscallarg(const char *) path; 1314 syscallarg(int) mode; 1315 syscallarg(int) dev; 1316 } */ *uap = v; 1317 struct vnode *vp; 1318 struct vattr vattr; 1319 int error; 1320 int whiteout = 0; 1321 struct nameidata nd; 1322 1323 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1324 return (error); 1325 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1326 if ((error = namei(&nd)) != 0) 1327 return (error); 1328 vp = nd.ni_vp; 1329 if (vp != NULL) 1330 error = EEXIST; 1331 else { 1332 VATTR_NULL(&vattr); 1333 vattr.va_mode = 1334 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1335 vattr.va_rdev = SCARG(uap, dev); 1336 whiteout = 0; 1337 1338 switch (SCARG(uap, mode) & S_IFMT) { 1339 case S_IFMT: /* used by badsect to flag bad sectors */ 1340 vattr.va_type = VBAD; 1341 break; 1342 case S_IFCHR: 1343 vattr.va_type = VCHR; 1344 break; 1345 case S_IFBLK: 1346 vattr.va_type = VBLK; 1347 break; 1348 case S_IFWHT: 1349 whiteout = 1; 1350 break; 1351 default: 1352 error = EINVAL; 1353 break; 1354 } 1355 } 1356 if (!error) { 1357 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1358 if (whiteout) { 1359 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1360 if (error) 1361 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1362 vput(nd.ni_dvp); 1363 } else { 1364 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1365 &nd.ni_cnd, &vattr); 1366 } 1367 } else { 1368 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1369 if (nd.ni_dvp == vp) 1370 vrele(nd.ni_dvp); 1371 else 1372 vput(nd.ni_dvp); 1373 if (vp) 1374 vrele(vp); 1375 } 1376 return (error); 1377 } 1378 1379 /* 1380 * Create a named pipe. 1381 */ 1382 /* ARGSUSED */ 1383 int 1384 sys_mkfifo(p, v, retval) 1385 struct proc *p; 1386 void *v; 1387 register_t *retval; 1388 { 1389 struct sys_mkfifo_args /* { 1390 syscallarg(const char *) path; 1391 syscallarg(int) mode; 1392 } */ *uap = v; 1393 struct vattr vattr; 1394 int error; 1395 struct nameidata nd; 1396 1397 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1398 if ((error = namei(&nd)) != 0) 1399 return (error); 1400 if (nd.ni_vp != NULL) { 1401 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1402 if (nd.ni_dvp == nd.ni_vp) 1403 vrele(nd.ni_dvp); 1404 else 1405 vput(nd.ni_dvp); 1406 vrele(nd.ni_vp); 1407 return (EEXIST); 1408 } 1409 VATTR_NULL(&vattr); 1410 vattr.va_type = VFIFO; 1411 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1412 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1413 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 1414 } 1415 1416 /* 1417 * Make a hard file link. 1418 */ 1419 /* ARGSUSED */ 1420 int 1421 sys_link(p, v, retval) 1422 struct proc *p; 1423 void *v; 1424 register_t *retval; 1425 { 1426 struct sys_link_args /* { 1427 syscallarg(const char *) path; 1428 syscallarg(const char *) link; 1429 } */ *uap = v; 1430 struct vnode *vp; 1431 struct nameidata nd; 1432 int error; 1433 1434 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1435 if ((error = namei(&nd)) != 0) 1436 return (error); 1437 vp = nd.ni_vp; 1438 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1439 if ((error = namei(&nd)) != 0) 1440 goto out; 1441 if (nd.ni_vp) { 1442 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1443 if (nd.ni_dvp == nd.ni_vp) 1444 vrele(nd.ni_dvp); 1445 else 1446 vput(nd.ni_dvp); 1447 vrele(nd.ni_vp); 1448 error = EEXIST; 1449 goto out; 1450 } 1451 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1452 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1453 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1454 out: 1455 vrele(vp); 1456 return (error); 1457 } 1458 1459 /* 1460 * Make a symbolic link. 1461 */ 1462 /* ARGSUSED */ 1463 int 1464 sys_symlink(p, v, retval) 1465 struct proc *p; 1466 void *v; 1467 register_t *retval; 1468 { 1469 struct sys_symlink_args /* { 1470 syscallarg(const char *) path; 1471 syscallarg(const char *) link; 1472 } */ *uap = v; 1473 struct vattr vattr; 1474 char *path; 1475 int error; 1476 struct nameidata nd; 1477 1478 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1479 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1480 if (error) 1481 goto out; 1482 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1483 if ((error = namei(&nd)) != 0) 1484 goto out; 1485 if (nd.ni_vp) { 1486 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1487 if (nd.ni_dvp == nd.ni_vp) 1488 vrele(nd.ni_dvp); 1489 else 1490 vput(nd.ni_dvp); 1491 vrele(nd.ni_vp); 1492 error = EEXIST; 1493 goto out; 1494 } 1495 VATTR_NULL(&vattr); 1496 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1497 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1498 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1499 out: 1500 FREE(path, M_NAMEI); 1501 return (error); 1502 } 1503 1504 /* 1505 * Delete a whiteout from the filesystem. 1506 */ 1507 /* ARGSUSED */ 1508 int 1509 sys_undelete(p, v, retval) 1510 struct proc *p; 1511 void *v; 1512 register_t *retval; 1513 { 1514 struct sys_undelete_args /* { 1515 syscallarg(const char *) path; 1516 } */ *uap = v; 1517 int error; 1518 struct nameidata nd; 1519 1520 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1521 SCARG(uap, path), p); 1522 error = namei(&nd); 1523 if (error) 1524 return (error); 1525 1526 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1527 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1528 if (nd.ni_dvp == nd.ni_vp) 1529 vrele(nd.ni_dvp); 1530 else 1531 vput(nd.ni_dvp); 1532 if (nd.ni_vp) 1533 vrele(nd.ni_vp); 1534 return (EEXIST); 1535 } 1536 1537 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1538 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1539 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1540 vput(nd.ni_dvp); 1541 return (error); 1542 } 1543 1544 /* 1545 * Delete a name from the filesystem. 1546 */ 1547 /* ARGSUSED */ 1548 int 1549 sys_unlink(p, v, retval) 1550 struct proc *p; 1551 void *v; 1552 register_t *retval; 1553 { 1554 struct sys_unlink_args /* { 1555 syscallarg(const char *) path; 1556 } */ *uap = v; 1557 struct vnode *vp; 1558 int error; 1559 struct nameidata nd; 1560 1561 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1562 SCARG(uap, path), p); 1563 if ((error = namei(&nd)) != 0) 1564 return (error); 1565 vp = nd.ni_vp; 1566 1567 /* 1568 * The root of a mounted filesystem cannot be deleted. 1569 */ 1570 if (vp->v_flag & VROOT) { 1571 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1572 if (nd.ni_dvp == vp) 1573 vrele(nd.ni_dvp); 1574 else 1575 vput(nd.ni_dvp); 1576 vput(vp); 1577 error = EBUSY; 1578 goto out; 1579 } 1580 1581 (void)uvm_vnp_uncache(vp); 1582 1583 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1584 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1585 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1586 out: 1587 return (error); 1588 } 1589 1590 /* 1591 * Reposition read/write file offset. 1592 */ 1593 int 1594 sys_lseek(p, v, retval) 1595 struct proc *p; 1596 void *v; 1597 register_t *retval; 1598 { 1599 struct sys_lseek_args /* { 1600 syscallarg(int) fd; 1601 syscallarg(int) pad; 1602 syscallarg(off_t) offset; 1603 syscallarg(int) whence; 1604 } */ *uap = v; 1605 struct ucred *cred = p->p_ucred; 1606 struct filedesc *fdp = p->p_fd; 1607 struct file *fp; 1608 struct vnode *vp; 1609 struct vattr vattr; 1610 off_t newoff; 1611 int error; 1612 1613 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1614 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL || 1615 (fp->f_iflags & FIF_WANTCLOSE) != 0) 1616 return (EBADF); 1617 1618 FILE_USE(fp); 1619 1620 vp = (struct vnode *)fp->f_data; 1621 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1622 error = ESPIPE; 1623 goto out; 1624 } 1625 1626 switch (SCARG(uap, whence)) { 1627 case SEEK_CUR: 1628 newoff = fp->f_offset + SCARG(uap, offset); 1629 break; 1630 case SEEK_END: 1631 error = VOP_GETATTR(vp, &vattr, cred, p); 1632 if (error) 1633 goto out; 1634 newoff = SCARG(uap, offset) + vattr.va_size; 1635 break; 1636 case SEEK_SET: 1637 newoff = SCARG(uap, offset); 1638 break; 1639 default: 1640 error = EINVAL; 1641 goto out; 1642 } 1643 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1644 goto out; 1645 1646 *(off_t *)retval = fp->f_offset = newoff; 1647 out: 1648 FILE_UNUSE(fp, p); 1649 return (error); 1650 } 1651 1652 /* 1653 * Positional read system call. 1654 */ 1655 int 1656 sys_pread(p, v, retval) 1657 struct proc *p; 1658 void *v; 1659 register_t *retval; 1660 { 1661 struct sys_pread_args /* { 1662 syscallarg(int) fd; 1663 syscallarg(void *) buf; 1664 syscallarg(size_t) nbyte; 1665 syscallarg(off_t) offset; 1666 } */ *uap = v; 1667 struct filedesc *fdp = p->p_fd; 1668 struct file *fp; 1669 struct vnode *vp; 1670 off_t offset; 1671 int error, fd = SCARG(uap, fd); 1672 1673 if ((u_int)fd >= fdp->fd_nfiles || 1674 (fp = fdp->fd_ofiles[fd]) == NULL || 1675 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1676 (fp->f_flag & FREAD) == 0) 1677 return (EBADF); 1678 1679 FILE_USE(fp); 1680 1681 vp = (struct vnode *)fp->f_data; 1682 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1683 error = ESPIPE; 1684 goto out; 1685 } 1686 1687 offset = SCARG(uap, offset); 1688 1689 /* 1690 * XXX This works because no file systems actually 1691 * XXX take any action on the seek operation. 1692 */ 1693 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1694 goto out; 1695 1696 /* dofileread() will unuse the descriptor for us */ 1697 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1698 &offset, 0, retval)); 1699 1700 out: 1701 FILE_UNUSE(fp, p); 1702 return (error); 1703 } 1704 1705 /* 1706 * Positional scatter read system call. 1707 */ 1708 int 1709 sys_preadv(p, v, retval) 1710 struct proc *p; 1711 void *v; 1712 register_t *retval; 1713 { 1714 struct sys_preadv_args /* { 1715 syscallarg(int) fd; 1716 syscallarg(const struct iovec *) iovp; 1717 syscallarg(int) iovcnt; 1718 syscallarg(off_t) offset; 1719 } */ *uap = v; 1720 struct filedesc *fdp = p->p_fd; 1721 struct file *fp; 1722 struct vnode *vp; 1723 off_t offset; 1724 int error, fd = SCARG(uap, fd); 1725 1726 if ((u_int)fd >= fdp->fd_nfiles || 1727 (fp = fdp->fd_ofiles[fd]) == NULL || 1728 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1729 (fp->f_flag & FREAD) == 0) 1730 return (EBADF); 1731 1732 FILE_USE(fp); 1733 1734 vp = (struct vnode *)fp->f_data; 1735 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1736 error = ESPIPE; 1737 goto out; 1738 } 1739 1740 offset = SCARG(uap, offset); 1741 1742 /* 1743 * XXX This works because no file systems actually 1744 * XXX take any action on the seek operation. 1745 */ 1746 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1747 goto out; 1748 1749 /* dofilereadv() will unuse the descriptor for us */ 1750 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1751 &offset, 0, retval)); 1752 1753 out: 1754 FILE_UNUSE(fp, p); 1755 return (error); 1756 } 1757 1758 /* 1759 * Positional write system call. 1760 */ 1761 int 1762 sys_pwrite(p, v, retval) 1763 struct proc *p; 1764 void *v; 1765 register_t *retval; 1766 { 1767 struct sys_pwrite_args /* { 1768 syscallarg(int) fd; 1769 syscallarg(const void *) buf; 1770 syscallarg(size_t) nbyte; 1771 syscallarg(off_t) offset; 1772 } */ *uap = v; 1773 struct filedesc *fdp = p->p_fd; 1774 struct file *fp; 1775 struct vnode *vp; 1776 off_t offset; 1777 int error, fd = SCARG(uap, fd); 1778 1779 if ((u_int)fd >= fdp->fd_nfiles || 1780 (fp = fdp->fd_ofiles[fd]) == NULL || 1781 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1782 (fp->f_flag & FWRITE) == 0) 1783 return (EBADF); 1784 1785 FILE_USE(fp); 1786 1787 vp = (struct vnode *)fp->f_data; 1788 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1789 error = ESPIPE; 1790 goto out; 1791 } 1792 1793 offset = SCARG(uap, offset); 1794 1795 /* 1796 * XXX This works because no file systems actually 1797 * XXX take any action on the seek operation. 1798 */ 1799 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1800 goto out; 1801 1802 /* dofilewrite() will unuse the descriptor for us */ 1803 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1804 &offset, 0, retval)); 1805 1806 out: 1807 FILE_UNUSE(fp, p); 1808 return (error); 1809 } 1810 1811 /* 1812 * Positional gather write system call. 1813 */ 1814 int 1815 sys_pwritev(p, v, retval) 1816 struct proc *p; 1817 void *v; 1818 register_t *retval; 1819 { 1820 struct sys_pwritev_args /* { 1821 syscallarg(int) fd; 1822 syscallarg(const struct iovec *) iovp; 1823 syscallarg(int) iovcnt; 1824 syscallarg(off_t) offset; 1825 } */ *uap = v; 1826 struct filedesc *fdp = p->p_fd; 1827 struct file *fp; 1828 struct vnode *vp; 1829 off_t offset; 1830 int error, fd = SCARG(uap, fd); 1831 1832 if ((u_int)fd >= fdp->fd_nfiles || 1833 (fp = fdp->fd_ofiles[fd]) == NULL || 1834 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1835 (fp->f_flag & FWRITE) == 0) 1836 return (EBADF); 1837 1838 FILE_USE(fp); 1839 1840 vp = (struct vnode *)fp->f_data; 1841 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1842 error = ESPIPE; 1843 goto out; 1844 } 1845 1846 offset = SCARG(uap, offset); 1847 1848 /* 1849 * XXX This works because no file systems actually 1850 * XXX take any action on the seek operation. 1851 */ 1852 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1853 goto out; 1854 1855 /* dofilewritev() will unuse the descriptor for us */ 1856 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1857 &offset, 0, retval)); 1858 1859 out: 1860 FILE_UNUSE(fp, p); 1861 return (error); 1862 } 1863 1864 /* 1865 * Check access permissions. 1866 */ 1867 int 1868 sys_access(p, v, retval) 1869 struct proc *p; 1870 void *v; 1871 register_t *retval; 1872 { 1873 struct sys_access_args /* { 1874 syscallarg(const char *) path; 1875 syscallarg(int) flags; 1876 } */ *uap = v; 1877 struct ucred *cred = p->p_ucred; 1878 struct vnode *vp; 1879 int error, flags, t_gid, t_uid; 1880 struct nameidata nd; 1881 1882 t_uid = cred->cr_uid; 1883 t_gid = cred->cr_gid; 1884 cred->cr_uid = p->p_cred->p_ruid; 1885 cred->cr_gid = p->p_cred->p_rgid; 1886 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1887 SCARG(uap, path), p); 1888 if ((error = namei(&nd)) != 0) 1889 goto out1; 1890 vp = nd.ni_vp; 1891 1892 /* Flags == 0 means only check for existence. */ 1893 if (SCARG(uap, flags)) { 1894 flags = 0; 1895 if (SCARG(uap, flags) & R_OK) 1896 flags |= VREAD; 1897 if (SCARG(uap, flags) & W_OK) 1898 flags |= VWRITE; 1899 if (SCARG(uap, flags) & X_OK) 1900 flags |= VEXEC; 1901 1902 error = VOP_ACCESS(vp, flags, cred, p); 1903 if (!error && (flags & VWRITE)) 1904 error = vn_writechk(vp); 1905 } 1906 vput(vp); 1907 out1: 1908 cred->cr_uid = t_uid; 1909 cred->cr_gid = t_gid; 1910 return (error); 1911 } 1912 1913 /* 1914 * Get file status; this version follows links. 1915 */ 1916 /* ARGSUSED */ 1917 int 1918 sys___stat13(p, v, retval) 1919 struct proc *p; 1920 void *v; 1921 register_t *retval; 1922 { 1923 struct sys___stat13_args /* { 1924 syscallarg(const char *) path; 1925 syscallarg(struct stat *) ub; 1926 } */ *uap = v; 1927 struct stat sb; 1928 int error; 1929 struct nameidata nd; 1930 1931 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1932 SCARG(uap, path), p); 1933 if ((error = namei(&nd)) != 0) 1934 return (error); 1935 error = vn_stat(nd.ni_vp, &sb, p); 1936 vput(nd.ni_vp); 1937 if (error) 1938 return (error); 1939 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1940 return (error); 1941 } 1942 1943 /* 1944 * Get file status; this version does not follow links. 1945 */ 1946 /* ARGSUSED */ 1947 int 1948 sys___lstat13(p, v, retval) 1949 struct proc *p; 1950 void *v; 1951 register_t *retval; 1952 { 1953 struct sys___lstat13_args /* { 1954 syscallarg(const char *) path; 1955 syscallarg(struct stat *) ub; 1956 } */ *uap = v; 1957 struct stat sb; 1958 int error; 1959 struct nameidata nd; 1960 1961 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1962 SCARG(uap, path), p); 1963 if ((error = namei(&nd)) != 0) 1964 return (error); 1965 error = vn_stat(nd.ni_vp, &sb, p); 1966 vput(nd.ni_vp); 1967 if (error) 1968 return (error); 1969 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1970 return (error); 1971 } 1972 1973 /* 1974 * Get configurable pathname variables. 1975 */ 1976 /* ARGSUSED */ 1977 int 1978 sys_pathconf(p, v, retval) 1979 struct proc *p; 1980 void *v; 1981 register_t *retval; 1982 { 1983 struct sys_pathconf_args /* { 1984 syscallarg(const char *) path; 1985 syscallarg(int) name; 1986 } */ *uap = v; 1987 int error; 1988 struct nameidata nd; 1989 1990 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1991 SCARG(uap, path), p); 1992 if ((error = namei(&nd)) != 0) 1993 return (error); 1994 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1995 vput(nd.ni_vp); 1996 return (error); 1997 } 1998 1999 /* 2000 * Return target name of a symbolic link. 2001 */ 2002 /* ARGSUSED */ 2003 int 2004 sys_readlink(p, v, retval) 2005 struct proc *p; 2006 void *v; 2007 register_t *retval; 2008 { 2009 struct sys_readlink_args /* { 2010 syscallarg(const char *) path; 2011 syscallarg(char *) buf; 2012 syscallarg(size_t) count; 2013 } */ *uap = v; 2014 struct vnode *vp; 2015 struct iovec aiov; 2016 struct uio auio; 2017 int error; 2018 struct nameidata nd; 2019 2020 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2021 SCARG(uap, path), p); 2022 if ((error = namei(&nd)) != 0) 2023 return (error); 2024 vp = nd.ni_vp; 2025 if (vp->v_type != VLNK) 2026 error = EINVAL; 2027 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2028 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 2029 aiov.iov_base = SCARG(uap, buf); 2030 aiov.iov_len = SCARG(uap, count); 2031 auio.uio_iov = &aiov; 2032 auio.uio_iovcnt = 1; 2033 auio.uio_offset = 0; 2034 auio.uio_rw = UIO_READ; 2035 auio.uio_segflg = UIO_USERSPACE; 2036 auio.uio_procp = p; 2037 auio.uio_resid = SCARG(uap, count); 2038 error = VOP_READLINK(vp, &auio, p->p_ucred); 2039 } 2040 vput(vp); 2041 *retval = SCARG(uap, count) - auio.uio_resid; 2042 return (error); 2043 } 2044 2045 /* 2046 * Change flags of a file given a path name. 2047 */ 2048 /* ARGSUSED */ 2049 int 2050 sys_chflags(p, v, retval) 2051 struct proc *p; 2052 void *v; 2053 register_t *retval; 2054 { 2055 struct sys_chflags_args /* { 2056 syscallarg(const char *) path; 2057 syscallarg(u_long) flags; 2058 } */ *uap = v; 2059 struct vnode *vp; 2060 struct vattr vattr; 2061 int error; 2062 struct nameidata nd; 2063 2064 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2065 if ((error = namei(&nd)) != 0) 2066 return (error); 2067 vp = nd.ni_vp; 2068 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2069 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2070 /* Non-superusers cannot change the flags on devices, even if they 2071 own them. */ 2072 if (suser(p->p_ucred, &p->p_acflag)) { 2073 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2074 goto out; 2075 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2076 error = EINVAL; 2077 goto out; 2078 } 2079 } 2080 VATTR_NULL(&vattr); 2081 vattr.va_flags = SCARG(uap, flags); 2082 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2083 out: 2084 vput(vp); 2085 return (error); 2086 } 2087 2088 /* 2089 * Change flags of a file given a file descriptor. 2090 */ 2091 /* ARGSUSED */ 2092 int 2093 sys_fchflags(p, v, retval) 2094 struct proc *p; 2095 void *v; 2096 register_t *retval; 2097 { 2098 struct sys_fchflags_args /* { 2099 syscallarg(int) fd; 2100 syscallarg(u_long) flags; 2101 } */ *uap = v; 2102 struct vattr vattr; 2103 struct vnode *vp; 2104 struct file *fp; 2105 int error; 2106 2107 /* getvnode() will use the descriptor for us */ 2108 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2109 return (error); 2110 vp = (struct vnode *)fp->f_data; 2111 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2112 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2113 /* Non-superusers cannot change the flags on devices, even if they 2114 own them. */ 2115 if (suser(p->p_ucred, &p->p_acflag)) { 2116 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) 2117 != 0) 2118 goto out; 2119 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2120 error = EINVAL; 2121 goto out; 2122 } 2123 } 2124 VATTR_NULL(&vattr); 2125 vattr.va_flags = SCARG(uap, flags); 2126 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2127 out: 2128 VOP_UNLOCK(vp, 0); 2129 FILE_UNUSE(fp, p); 2130 return (error); 2131 } 2132 2133 /* 2134 * Change flags of a file given a file descriptor; this version does 2135 * not follow links. 2136 */ 2137 int 2138 sys_lchflags(p, v, retval) 2139 struct proc *p; 2140 void *v; 2141 register_t *retval; 2142 { 2143 register struct sys_chflags_args /* { 2144 syscallarg(const char *) path; 2145 syscallarg(u_long) flags; 2146 } */ *uap = v; 2147 register struct vnode *vp; 2148 struct vattr vattr; 2149 int error; 2150 struct nameidata nd; 2151 2152 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2153 if ((error = namei(&nd)) != 0) 2154 return (error); 2155 vp = nd.ni_vp; 2156 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2157 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2158 /* Non-superusers cannot change the flags on devices, even if they 2159 own them. */ 2160 if (suser(p->p_ucred, &p->p_acflag)) { 2161 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2162 goto out; 2163 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2164 error = EINVAL; 2165 goto out; 2166 } 2167 } 2168 VATTR_NULL(&vattr); 2169 vattr.va_flags = SCARG(uap, flags); 2170 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2171 out: 2172 vput(vp); 2173 return (error); 2174 } 2175 2176 /* 2177 * Change mode of a file given path name; this version follows links. 2178 */ 2179 /* ARGSUSED */ 2180 int 2181 sys_chmod(p, v, retval) 2182 struct proc *p; 2183 void *v; 2184 register_t *retval; 2185 { 2186 struct sys_chmod_args /* { 2187 syscallarg(const char *) path; 2188 syscallarg(int) mode; 2189 } */ *uap = v; 2190 int error; 2191 struct nameidata nd; 2192 2193 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2194 if ((error = namei(&nd)) != 0) 2195 return (error); 2196 2197 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2198 2199 vrele(nd.ni_vp); 2200 return (error); 2201 } 2202 2203 /* 2204 * Change mode of a file given a file descriptor. 2205 */ 2206 /* ARGSUSED */ 2207 int 2208 sys_fchmod(p, v, retval) 2209 struct proc *p; 2210 void *v; 2211 register_t *retval; 2212 { 2213 struct sys_fchmod_args /* { 2214 syscallarg(int) fd; 2215 syscallarg(int) mode; 2216 } */ *uap = v; 2217 struct file *fp; 2218 int error; 2219 2220 /* getvnode() will use the descriptor for us */ 2221 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2222 return (error); 2223 2224 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2225 FILE_UNUSE(fp, p); 2226 return (error); 2227 } 2228 2229 /* 2230 * Change mode of a file given path name; this version does not follow links. 2231 */ 2232 /* ARGSUSED */ 2233 int 2234 sys_lchmod(p, v, retval) 2235 struct proc *p; 2236 void *v; 2237 register_t *retval; 2238 { 2239 struct sys_lchmod_args /* { 2240 syscallarg(const char *) path; 2241 syscallarg(int) mode; 2242 } */ *uap = v; 2243 int error; 2244 struct nameidata nd; 2245 2246 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2247 if ((error = namei(&nd)) != 0) 2248 return (error); 2249 2250 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2251 2252 vrele(nd.ni_vp); 2253 return (error); 2254 } 2255 2256 /* 2257 * Common routine to set mode given a vnode. 2258 */ 2259 static int 2260 change_mode(vp, mode, p) 2261 struct vnode *vp; 2262 int mode; 2263 struct proc *p; 2264 { 2265 struct vattr vattr; 2266 int error; 2267 2268 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2269 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2270 VATTR_NULL(&vattr); 2271 vattr.va_mode = mode & ALLPERMS; 2272 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2273 VOP_UNLOCK(vp, 0); 2274 return (error); 2275 } 2276 2277 /* 2278 * Set ownership given a path name; this version follows links. 2279 */ 2280 /* ARGSUSED */ 2281 int 2282 sys_chown(p, v, retval) 2283 struct proc *p; 2284 void *v; 2285 register_t *retval; 2286 { 2287 struct sys_chown_args /* { 2288 syscallarg(const char *) path; 2289 syscallarg(uid_t) uid; 2290 syscallarg(gid_t) gid; 2291 } */ *uap = v; 2292 int error; 2293 struct nameidata nd; 2294 2295 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2296 if ((error = namei(&nd)) != 0) 2297 return (error); 2298 2299 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2300 2301 vrele(nd.ni_vp); 2302 return (error); 2303 } 2304 2305 /* 2306 * Set ownership given a path name; this version follows links. 2307 * Provides POSIX semantics. 2308 */ 2309 /* ARGSUSED */ 2310 int 2311 sys___posix_chown(p, v, retval) 2312 struct proc *p; 2313 void *v; 2314 register_t *retval; 2315 { 2316 struct sys_chown_args /* { 2317 syscallarg(const char *) path; 2318 syscallarg(uid_t) uid; 2319 syscallarg(gid_t) gid; 2320 } */ *uap = v; 2321 int error; 2322 struct nameidata nd; 2323 2324 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2325 if ((error = namei(&nd)) != 0) 2326 return (error); 2327 2328 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2329 2330 vrele(nd.ni_vp); 2331 return (error); 2332 } 2333 2334 /* 2335 * Set ownership given a file descriptor. 2336 */ 2337 /* ARGSUSED */ 2338 int 2339 sys_fchown(p, v, retval) 2340 struct proc *p; 2341 void *v; 2342 register_t *retval; 2343 { 2344 struct sys_fchown_args /* { 2345 syscallarg(int) fd; 2346 syscallarg(uid_t) uid; 2347 syscallarg(gid_t) gid; 2348 } */ *uap = v; 2349 int error; 2350 struct file *fp; 2351 2352 /* getvnode() will use the descriptor for us */ 2353 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2354 return (error); 2355 2356 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2357 SCARG(uap, gid), p, 0); 2358 FILE_UNUSE(fp, p); 2359 return (error); 2360 } 2361 2362 /* 2363 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2364 */ 2365 /* ARGSUSED */ 2366 int 2367 sys___posix_fchown(p, v, retval) 2368 struct proc *p; 2369 void *v; 2370 register_t *retval; 2371 { 2372 struct sys_fchown_args /* { 2373 syscallarg(int) fd; 2374 syscallarg(uid_t) uid; 2375 syscallarg(gid_t) gid; 2376 } */ *uap = v; 2377 int error; 2378 struct file *fp; 2379 2380 /* getvnode() will use the descriptor for us */ 2381 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2382 return (error); 2383 2384 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2385 SCARG(uap, gid), p, 1); 2386 FILE_UNUSE(fp, p); 2387 return (error); 2388 } 2389 2390 /* 2391 * Set ownership given a path name; this version does not follow links. 2392 */ 2393 /* ARGSUSED */ 2394 int 2395 sys_lchown(p, v, retval) 2396 struct proc *p; 2397 void *v; 2398 register_t *retval; 2399 { 2400 struct sys_lchown_args /* { 2401 syscallarg(const char *) path; 2402 syscallarg(uid_t) uid; 2403 syscallarg(gid_t) gid; 2404 } */ *uap = v; 2405 int error; 2406 struct nameidata nd; 2407 2408 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2409 if ((error = namei(&nd)) != 0) 2410 return (error); 2411 2412 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2413 2414 vrele(nd.ni_vp); 2415 return (error); 2416 } 2417 2418 /* 2419 * Set ownership given a path name; this version does not follow links. 2420 * Provides POSIX/XPG semantics. 2421 */ 2422 /* ARGSUSED */ 2423 int 2424 sys___posix_lchown(p, v, retval) 2425 struct proc *p; 2426 void *v; 2427 register_t *retval; 2428 { 2429 struct sys_lchown_args /* { 2430 syscallarg(const char *) path; 2431 syscallarg(uid_t) uid; 2432 syscallarg(gid_t) gid; 2433 } */ *uap = v; 2434 int error; 2435 struct nameidata nd; 2436 2437 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2438 if ((error = namei(&nd)) != 0) 2439 return (error); 2440 2441 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2442 2443 vrele(nd.ni_vp); 2444 return (error); 2445 } 2446 2447 /* 2448 * Common routine to set ownership given a vnode. 2449 */ 2450 static int 2451 change_owner(vp, uid, gid, p, posix_semantics) 2452 struct vnode *vp; 2453 uid_t uid; 2454 gid_t gid; 2455 struct proc *p; 2456 int posix_semantics; 2457 { 2458 struct vattr vattr; 2459 mode_t newmode; 2460 int error; 2461 2462 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2463 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2464 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2465 goto out; 2466 2467 #define CHANGED(x) ((x) != -1) 2468 newmode = vattr.va_mode; 2469 if (posix_semantics) { 2470 /* 2471 * POSIX/XPG semantics: if the caller is not the super-user, 2472 * clear set-user-id and set-group-id bits. Both POSIX and 2473 * the XPG consider the behaviour for calls by the super-user 2474 * implementation-defined; we leave the set-user-id and set- 2475 * group-id settings intact in that case. 2476 */ 2477 if (suser(p->p_ucred, NULL) != 0) 2478 newmode &= ~(S_ISUID | S_ISGID); 2479 } else { 2480 /* 2481 * NetBSD semantics: when changing owner and/or group, 2482 * clear the respective bit(s). 2483 */ 2484 if (CHANGED(uid)) 2485 newmode &= ~S_ISUID; 2486 if (CHANGED(gid)) 2487 newmode &= ~S_ISGID; 2488 } 2489 /* Update va_mode iff altered. */ 2490 if (vattr.va_mode == newmode) 2491 newmode = VNOVAL; 2492 2493 VATTR_NULL(&vattr); 2494 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2495 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2496 vattr.va_mode = newmode; 2497 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2498 #undef CHANGED 2499 2500 out: 2501 VOP_UNLOCK(vp, 0); 2502 return (error); 2503 } 2504 2505 /* 2506 * Set the access and modification times given a path name; this 2507 * version follows links. 2508 */ 2509 /* ARGSUSED */ 2510 int 2511 sys_utimes(p, v, retval) 2512 struct proc *p; 2513 void *v; 2514 register_t *retval; 2515 { 2516 struct sys_utimes_args /* { 2517 syscallarg(const char *) path; 2518 syscallarg(const struct timeval *) tptr; 2519 } */ *uap = v; 2520 int error; 2521 struct nameidata nd; 2522 2523 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2524 if ((error = namei(&nd)) != 0) 2525 return (error); 2526 2527 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2528 2529 vrele(nd.ni_vp); 2530 return (error); 2531 } 2532 2533 /* 2534 * Set the access and modification times given a file descriptor. 2535 */ 2536 /* ARGSUSED */ 2537 int 2538 sys_futimes(p, v, retval) 2539 struct proc *p; 2540 void *v; 2541 register_t *retval; 2542 { 2543 struct sys_futimes_args /* { 2544 syscallarg(int) fd; 2545 syscallarg(const struct timeval *) tptr; 2546 } */ *uap = v; 2547 int error; 2548 struct file *fp; 2549 2550 /* getvnode() will use the descriptor for us */ 2551 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2552 return (error); 2553 2554 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2555 FILE_UNUSE(fp, p); 2556 return (error); 2557 } 2558 2559 /* 2560 * Set the access and modification times given a path name; this 2561 * version does not follow links. 2562 */ 2563 /* ARGSUSED */ 2564 int 2565 sys_lutimes(p, v, retval) 2566 struct proc *p; 2567 void *v; 2568 register_t *retval; 2569 { 2570 struct sys_lutimes_args /* { 2571 syscallarg(const char *) path; 2572 syscallarg(const struct timeval *) tptr; 2573 } */ *uap = v; 2574 int error; 2575 struct nameidata nd; 2576 2577 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2578 if ((error = namei(&nd)) != 0) 2579 return (error); 2580 2581 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2582 2583 vrele(nd.ni_vp); 2584 return (error); 2585 } 2586 2587 /* 2588 * Common routine to set access and modification times given a vnode. 2589 */ 2590 static int 2591 change_utimes(vp, tptr, p) 2592 struct vnode *vp; 2593 const struct timeval *tptr; 2594 struct proc *p; 2595 { 2596 struct timeval tv[2]; 2597 struct vattr vattr; 2598 int error; 2599 2600 VATTR_NULL(&vattr); 2601 if (tptr == NULL) { 2602 microtime(&tv[0]); 2603 tv[1] = tv[0]; 2604 vattr.va_vaflags |= VA_UTIMES_NULL; 2605 } else { 2606 error = copyin(tptr, tv, sizeof(tv)); 2607 if (error) 2608 return (error); 2609 } 2610 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2611 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2612 vattr.va_atime.tv_sec = tv[0].tv_sec; 2613 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2614 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2615 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2616 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2617 VOP_UNLOCK(vp, 0); 2618 return (error); 2619 } 2620 2621 /* 2622 * Truncate a file given its path name. 2623 */ 2624 /* ARGSUSED */ 2625 int 2626 sys_truncate(p, v, retval) 2627 struct proc *p; 2628 void *v; 2629 register_t *retval; 2630 { 2631 struct sys_truncate_args /* { 2632 syscallarg(const char *) path; 2633 syscallarg(int) pad; 2634 syscallarg(off_t) length; 2635 } */ *uap = v; 2636 struct vnode *vp; 2637 struct vattr vattr; 2638 int error; 2639 struct nameidata nd; 2640 2641 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2642 if ((error = namei(&nd)) != 0) 2643 return (error); 2644 vp = nd.ni_vp; 2645 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2646 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2647 if (vp->v_type == VDIR) 2648 error = EISDIR; 2649 else if ((error = vn_writechk(vp)) == 0 && 2650 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2651 VATTR_NULL(&vattr); 2652 vattr.va_size = SCARG(uap, length); 2653 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2654 } 2655 vput(vp); 2656 return (error); 2657 } 2658 2659 /* 2660 * Truncate a file given a file descriptor. 2661 */ 2662 /* ARGSUSED */ 2663 int 2664 sys_ftruncate(p, v, retval) 2665 struct proc *p; 2666 void *v; 2667 register_t *retval; 2668 { 2669 struct sys_ftruncate_args /* { 2670 syscallarg(int) fd; 2671 syscallarg(int) pad; 2672 syscallarg(off_t) length; 2673 } */ *uap = v; 2674 struct vattr vattr; 2675 struct vnode *vp; 2676 struct file *fp; 2677 int error; 2678 2679 /* getvnode() will use the descriptor for us */ 2680 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2681 return (error); 2682 if ((fp->f_flag & FWRITE) == 0) { 2683 error = EINVAL; 2684 goto out; 2685 } 2686 vp = (struct vnode *)fp->f_data; 2687 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2688 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2689 if (vp->v_type == VDIR) 2690 error = EISDIR; 2691 else if ((error = vn_writechk(vp)) == 0) { 2692 VATTR_NULL(&vattr); 2693 vattr.va_size = SCARG(uap, length); 2694 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2695 } 2696 VOP_UNLOCK(vp, 0); 2697 out: 2698 FILE_UNUSE(fp, p); 2699 return (error); 2700 } 2701 2702 /* 2703 * Sync an open file. 2704 */ 2705 /* ARGSUSED */ 2706 int 2707 sys_fsync(p, v, retval) 2708 struct proc *p; 2709 void *v; 2710 register_t *retval; 2711 { 2712 struct sys_fsync_args /* { 2713 syscallarg(int) fd; 2714 } */ *uap = v; 2715 struct vnode *vp; 2716 struct file *fp; 2717 int error; 2718 2719 /* getvnode() will use the descriptor for us */ 2720 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2721 return (error); 2722 vp = (struct vnode *)fp->f_data; 2723 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2724 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, p); 2725 if (error == 0 && bioops.io_fsync != NULL && 2726 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 2727 (*bioops.io_fsync)(vp); 2728 VOP_UNLOCK(vp, 0); 2729 FILE_UNUSE(fp, p); 2730 return (error); 2731 } 2732 2733 /* 2734 * Sync the data of an open file. 2735 */ 2736 /* ARGSUSED */ 2737 int 2738 sys_fdatasync(p, v, retval) 2739 struct proc *p; 2740 void *v; 2741 register_t *retval; 2742 { 2743 struct sys_fdatasync_args /* { 2744 syscallarg(int) fd; 2745 } */ *uap = v; 2746 struct vnode *vp; 2747 struct file *fp; 2748 int error; 2749 2750 /* getvnode() will use the descriptor for us */ 2751 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2752 return (error); 2753 vp = (struct vnode *)fp->f_data; 2754 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2755 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, p); 2756 VOP_UNLOCK(vp, 0); 2757 FILE_UNUSE(fp, p); 2758 return (error); 2759 } 2760 2761 /* 2762 * Rename files, (standard) BSD semantics frontend. 2763 */ 2764 /* ARGSUSED */ 2765 int 2766 sys_rename(p, v, retval) 2767 struct proc *p; 2768 void *v; 2769 register_t *retval; 2770 { 2771 struct sys_rename_args /* { 2772 syscallarg(const char *) from; 2773 syscallarg(const char *) to; 2774 } */ *uap = v; 2775 2776 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2777 } 2778 2779 /* 2780 * Rename files, POSIX semantics frontend. 2781 */ 2782 /* ARGSUSED */ 2783 int 2784 sys___posix_rename(p, v, retval) 2785 struct proc *p; 2786 void *v; 2787 register_t *retval; 2788 { 2789 struct sys___posix_rename_args /* { 2790 syscallarg(const char *) from; 2791 syscallarg(const char *) to; 2792 } */ *uap = v; 2793 2794 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2795 } 2796 2797 /* 2798 * Rename files. Source and destination must either both be directories, 2799 * or both not be directories. If target is a directory, it must be empty. 2800 * If `from' and `to' refer to the same object, the value of the `retain' 2801 * argument is used to determine whether `from' will be 2802 * 2803 * (retain == 0) deleted unless `from' and `to' refer to the same 2804 * object in the file system's name space (BSD). 2805 * (retain == 1) always retained (POSIX). 2806 */ 2807 static int 2808 rename_files(from, to, p, retain) 2809 const char *from, *to; 2810 struct proc *p; 2811 int retain; 2812 { 2813 struct vnode *tvp, *fvp, *tdvp; 2814 struct nameidata fromnd, tond; 2815 int error; 2816 2817 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2818 from, p); 2819 if ((error = namei(&fromnd)) != 0) 2820 return (error); 2821 fvp = fromnd.ni_vp; 2822 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2823 UIO_USERSPACE, to, p); 2824 if ((error = namei(&tond)) != 0) { 2825 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2826 vrele(fromnd.ni_dvp); 2827 vrele(fvp); 2828 goto out1; 2829 } 2830 tdvp = tond.ni_dvp; 2831 tvp = tond.ni_vp; 2832 2833 if (tvp != NULL) { 2834 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2835 error = ENOTDIR; 2836 goto out; 2837 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2838 error = EISDIR; 2839 goto out; 2840 } 2841 } 2842 2843 if (fvp == tdvp) 2844 error = EINVAL; 2845 2846 /* 2847 * Source and destination refer to the same object. 2848 */ 2849 if (fvp == tvp) { 2850 if (retain) 2851 error = -1; 2852 else if (fromnd.ni_dvp == tdvp && 2853 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2854 !memcmp(fromnd.ni_cnd.cn_nameptr, 2855 tond.ni_cnd.cn_nameptr, 2856 fromnd.ni_cnd.cn_namelen)) 2857 error = -1; 2858 } 2859 2860 out: 2861 if (!error) { 2862 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2863 if (fromnd.ni_dvp != tdvp) 2864 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2865 if (tvp) { 2866 (void)uvm_vnp_uncache(tvp); 2867 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2868 } 2869 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2870 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2871 } else { 2872 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2873 if (tdvp == tvp) 2874 vrele(tdvp); 2875 else 2876 vput(tdvp); 2877 if (tvp) 2878 vput(tvp); 2879 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2880 vrele(fromnd.ni_dvp); 2881 vrele(fvp); 2882 } 2883 vrele(tond.ni_startdir); 2884 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2885 out1: 2886 if (fromnd.ni_startdir) 2887 vrele(fromnd.ni_startdir); 2888 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2889 return (error == -1 ? 0 : error); 2890 } 2891 2892 /* 2893 * Make a directory file. 2894 */ 2895 /* ARGSUSED */ 2896 int 2897 sys_mkdir(p, v, retval) 2898 struct proc *p; 2899 void *v; 2900 register_t *retval; 2901 { 2902 struct sys_mkdir_args /* { 2903 syscallarg(const char *) path; 2904 syscallarg(int) mode; 2905 } */ *uap = v; 2906 struct vnode *vp; 2907 struct vattr vattr; 2908 int error; 2909 struct nameidata nd; 2910 2911 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2912 if ((error = namei(&nd)) != 0) 2913 return (error); 2914 vp = nd.ni_vp; 2915 if (vp != NULL) { 2916 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2917 if (nd.ni_dvp == vp) 2918 vrele(nd.ni_dvp); 2919 else 2920 vput(nd.ni_dvp); 2921 vrele(vp); 2922 return (EEXIST); 2923 } 2924 VATTR_NULL(&vattr); 2925 vattr.va_type = VDIR; 2926 vattr.va_mode = 2927 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2928 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2929 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2930 if (!error) 2931 vput(nd.ni_vp); 2932 return (error); 2933 } 2934 2935 /* 2936 * Remove a directory file. 2937 */ 2938 /* ARGSUSED */ 2939 int 2940 sys_rmdir(p, v, retval) 2941 struct proc *p; 2942 void *v; 2943 register_t *retval; 2944 { 2945 struct sys_rmdir_args /* { 2946 syscallarg(const char *) path; 2947 } */ *uap = v; 2948 struct vnode *vp; 2949 int error; 2950 struct nameidata nd; 2951 2952 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2953 SCARG(uap, path), p); 2954 if ((error = namei(&nd)) != 0) 2955 return (error); 2956 vp = nd.ni_vp; 2957 if (vp->v_type != VDIR) { 2958 error = ENOTDIR; 2959 goto out; 2960 } 2961 /* 2962 * No rmdir "." please. 2963 */ 2964 if (nd.ni_dvp == vp) { 2965 error = EINVAL; 2966 goto out; 2967 } 2968 /* 2969 * The root of a mounted filesystem cannot be deleted. 2970 */ 2971 if (vp->v_flag & VROOT) 2972 error = EBUSY; 2973 out: 2974 if (!error) { 2975 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2976 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2977 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2978 } else { 2979 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2980 if (nd.ni_dvp == vp) 2981 vrele(nd.ni_dvp); 2982 else 2983 vput(nd.ni_dvp); 2984 vput(vp); 2985 } 2986 return (error); 2987 } 2988 2989 /* 2990 * Read a block of directory entries in a file system independent format. 2991 */ 2992 int 2993 sys_getdents(p, v, retval) 2994 struct proc *p; 2995 void *v; 2996 register_t *retval; 2997 { 2998 struct sys_getdents_args /* { 2999 syscallarg(int) fd; 3000 syscallarg(char *) buf; 3001 syscallarg(size_t) count; 3002 } */ *uap = v; 3003 struct file *fp; 3004 int error, done; 3005 3006 /* getvnode() will use the descriptor for us */ 3007 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3008 return (error); 3009 if ((fp->f_flag & FREAD) == 0) { 3010 error = EBADF; 3011 goto out; 3012 } 3013 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 3014 SCARG(uap, count), &done, p, 0, 0); 3015 *retval = done; 3016 out: 3017 FILE_UNUSE(fp, p); 3018 return (error); 3019 } 3020 3021 /* 3022 * Set the mode mask for creation of filesystem nodes. 3023 */ 3024 int 3025 sys_umask(p, v, retval) 3026 struct proc *p; 3027 void *v; 3028 register_t *retval; 3029 { 3030 struct sys_umask_args /* { 3031 syscallarg(mode_t) newmask; 3032 } */ *uap = v; 3033 struct cwdinfo *cwdi; 3034 3035 cwdi = p->p_cwdi; 3036 *retval = cwdi->cwdi_cmask; 3037 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 3038 return (0); 3039 } 3040 3041 /* 3042 * Void all references to file by ripping underlying filesystem 3043 * away from vnode. 3044 */ 3045 /* ARGSUSED */ 3046 int 3047 sys_revoke(p, v, retval) 3048 struct proc *p; 3049 void *v; 3050 register_t *retval; 3051 { 3052 struct sys_revoke_args /* { 3053 syscallarg(const char *) path; 3054 } */ *uap = v; 3055 struct vnode *vp; 3056 struct vattr vattr; 3057 int error; 3058 struct nameidata nd; 3059 3060 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3061 if ((error = namei(&nd)) != 0) 3062 return (error); 3063 vp = nd.ni_vp; 3064 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 3065 goto out; 3066 if (p->p_ucred->cr_uid != vattr.va_uid && 3067 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 3068 goto out; 3069 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3070 VOP_REVOKE(vp, REVOKEALL); 3071 out: 3072 vrele(vp); 3073 return (error); 3074 } 3075 3076 /* 3077 * Convert a user file descriptor to a kernel file entry. 3078 */ 3079 int 3080 getvnode(fdp, fd, fpp) 3081 struct filedesc *fdp; 3082 int fd; 3083 struct file **fpp; 3084 { 3085 struct vnode *vp; 3086 struct file *fp; 3087 3088 if ((u_int)fd >= fdp->fd_nfiles || 3089 (fp = fdp->fd_ofiles[fd]) == NULL || 3090 (fp->f_iflags & FIF_WANTCLOSE) != 0) 3091 return (EBADF); 3092 3093 FILE_USE(fp); 3094 3095 if (fp->f_type != DTYPE_VNODE) { 3096 FILE_UNUSE(fp, NULL); 3097 return (EINVAL); 3098 } 3099 3100 vp = (struct vnode *)fp->f_data; 3101 if (vp->v_type == VBAD) { 3102 FILE_UNUSE(fp, NULL); 3103 return (EBADF); 3104 } 3105 3106 *fpp = fp; 3107 return (0); 3108 } 3109
Indexes created Fri Oct 03 02:09:57 GMT 2025