vfs_syscalls.c revision 1.157
1 /* $NetBSD: vfs_syscalls.c,v 1.157 2000/06/15 22:32:44 fvdl 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 return (EPERM); 222 } 223 /* 224 * If the user is not root, ensure that they own the directory 225 * onto which we are attempting to mount. 226 */ 227 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || 228 (va.va_uid != p->p_ucred->cr_uid && 229 (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { 230 vput(vp); 231 return (error); 232 } 233 /* 234 * Do not allow NFS export by non-root users. For non-root users, 235 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 236 * mount point is already MNT_NOEXEC. 237 */ 238 if (p->p_ucred->cr_uid != 0) { 239 if (SCARG(uap, flags) & MNT_EXPORTED) { 240 vput(vp); 241 return (EPERM); 242 } 243 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 244 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 245 SCARG(uap, flags) |= MNT_NOEXEC; 246 } 247 if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 248 return (error); 249 if (vp->v_type != VDIR) { 250 vput(vp); 251 return (ENOTDIR); 252 } 253 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 254 if (error) { 255 #if defined(COMPAT_09) || defined(COMPAT_43) 256 /* 257 * Historically filesystem types were identified by number. 258 * If we get an integer for the filesystem type instead of a 259 * string, we check to see if it matches one of the historic 260 * filesystem types. 261 */ 262 u_long fsindex = (u_long)SCARG(uap, type); 263 if (fsindex >= nmountcompatnames || 264 mountcompatnames[fsindex] == NULL) { 265 vput(vp); 266 return (ENODEV); 267 } 268 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 269 #else 270 vput(vp); 271 return (error); 272 #endif 273 } 274 #ifdef COMPAT_10 275 /* Accept `ufs' as an alias for `ffs'. */ 276 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 277 strncpy(fstypename, "ffs", MFSNAMELEN); 278 #endif 279 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 280 vput(vp); 281 return (ENODEV); 282 } 283 if (vp->v_mountedhere != NULL) { 284 vput(vp); 285 return (EBUSY); 286 } 287 288 /* 289 * Allocate and initialize the file system. 290 */ 291 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 292 M_MOUNT, M_WAITOK); 293 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 294 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 295 (void)vfs_busy(mp, LK_NOWAIT, 0); 296 mp->mnt_op = vfs; 297 vfs->vfs_refcount++; 298 mp->mnt_vnodecovered = vp; 299 mp->mnt_stat.f_owner = p->p_ucred->cr_uid; 300 mp->mnt_unmounter = NULL; 301 update: 302 /* 303 * Set the mount level flags. 304 */ 305 if (SCARG(uap, flags) & MNT_RDONLY) 306 mp->mnt_flag |= MNT_RDONLY; 307 else if (mp->mnt_flag & MNT_RDONLY) 308 mp->mnt_flag |= MNT_WANTRDWR; 309 mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 310 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 311 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP); 312 mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | 313 MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | 314 MNT_NOCOREDUMP | MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | 315 MNT_SOFTDEP); 316 /* 317 * Mount the filesystem. 318 */ 319 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); 320 if (mp->mnt_flag & MNT_UPDATE) { 321 vrele(vp); 322 if (mp->mnt_flag & MNT_WANTRDWR) 323 mp->mnt_flag &= ~MNT_RDONLY; 324 mp->mnt_flag &=~ 325 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR); 326 if (error) 327 mp->mnt_flag = flag; 328 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { 329 if (mp->mnt_syncer == NULL) 330 error = vfs_allocate_syncvnode(mp); 331 } else { 332 if (mp->mnt_syncer != NULL) { 333 vgone(mp->mnt_syncer); 334 mp->mnt_syncer = NULL; 335 } 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 vgone(mp->mnt_syncer); 503 mp->mnt_syncer = NULL; 504 } 505 if (((mp->mnt_flag & MNT_RDONLY) || 506 (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || 507 (flags & MNT_FORCE)) 508 error = VFS_UNMOUNT(mp, flags, p); 509 simple_lock(&mountlist_slock); 510 if (error) { 511 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 512 (void) vfs_allocate_syncvnode(mp); 513 mp->mnt_flag &= ~MNT_UNMOUNT; 514 mp->mnt_unmounter = NULL; 515 mp->mnt_flag |= async; 516 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 517 &mountlist_slock); 518 lockmgr(&syncer_lock, LK_RELEASE, NULL); 519 while (mp->mnt_wcnt > 0) { 520 wakeup((caddr_t)mp); 521 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 0); 522 } 523 return (error); 524 } 525 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 526 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 527 coveredvp->v_mountedhere = NULL; 528 vrele(coveredvp); 529 } 530 mp->mnt_op->vfs_refcount--; 531 if (mp->mnt_vnodelist.lh_first != NULL) 532 panic("unmount: dangling vnode"); 533 mp->mnt_flag |= MNT_GONE; 534 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 535 lockmgr(&syncer_lock, LK_RELEASE, NULL); 536 while(mp->mnt_wcnt > 0) { 537 wakeup((caddr_t)mp); 538 tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0); 539 } 540 free((caddr_t)mp, M_MOUNT); 541 return (0); 542 } 543 544 /* 545 * Sync each mounted filesystem. 546 */ 547 #ifdef DEBUG 548 int syncprt = 0; 549 struct ctldebug debug0 = { "syncprt", &syncprt }; 550 #endif 551 552 /* ARGSUSED */ 553 int 554 sys_sync(p, v, retval) 555 struct proc *p; 556 void *v; 557 register_t *retval; 558 { 559 struct mount *mp, *nmp; 560 int asyncflag; 561 562 simple_lock(&mountlist_slock); 563 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 564 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 565 nmp = mp->mnt_list.cqe_prev; 566 continue; 567 } 568 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 569 asyncflag = mp->mnt_flag & MNT_ASYNC; 570 mp->mnt_flag &= ~MNT_ASYNC; 571 uvm_vnp_sync(mp); 572 VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); 573 if (asyncflag) 574 mp->mnt_flag |= MNT_ASYNC; 575 } 576 simple_lock(&mountlist_slock); 577 nmp = mp->mnt_list.cqe_prev; 578 vfs_unbusy(mp); 579 580 } 581 simple_unlock(&mountlist_slock); 582 #ifdef DEBUG 583 if (syncprt) 584 vfs_bufstats(); 585 #endif /* DEBUG */ 586 return (0); 587 } 588 589 /* 590 * Change filesystem quotas. 591 */ 592 /* ARGSUSED */ 593 int 594 sys_quotactl(p, v, retval) 595 struct proc *p; 596 void *v; 597 register_t *retval; 598 { 599 struct sys_quotactl_args /* { 600 syscallarg(const char *) path; 601 syscallarg(int) cmd; 602 syscallarg(int) uid; 603 syscallarg(caddr_t) arg; 604 } */ *uap = v; 605 struct mount *mp; 606 int error; 607 struct nameidata nd; 608 609 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 610 if ((error = namei(&nd)) != 0) 611 return (error); 612 mp = nd.ni_vp->v_mount; 613 vrele(nd.ni_vp); 614 return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 615 SCARG(uap, arg), p)); 616 } 617 618 /* 619 * Get filesystem statistics. 620 */ 621 /* ARGSUSED */ 622 int 623 sys_statfs(p, v, retval) 624 struct proc *p; 625 void *v; 626 register_t *retval; 627 { 628 struct sys_statfs_args /* { 629 syscallarg(const char *) path; 630 syscallarg(struct statfs *) buf; 631 } */ *uap = v; 632 struct mount *mp; 633 struct statfs *sp; 634 int error; 635 struct nameidata nd; 636 637 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 638 if ((error = namei(&nd)) != 0) 639 return (error); 640 mp = nd.ni_vp->v_mount; 641 sp = &mp->mnt_stat; 642 vrele(nd.ni_vp); 643 if ((error = VFS_STATFS(mp, sp, p)) != 0) 644 return (error); 645 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 646 sp->f_oflags = sp->f_flags & 0xffff; 647 return (copyout(sp, SCARG(uap, buf), sizeof(*sp))); 648 } 649 650 /* 651 * Get filesystem statistics. 652 */ 653 /* ARGSUSED */ 654 int 655 sys_fstatfs(p, v, retval) 656 struct proc *p; 657 void *v; 658 register_t *retval; 659 { 660 struct sys_fstatfs_args /* { 661 syscallarg(int) fd; 662 syscallarg(struct statfs *) buf; 663 } */ *uap = v; 664 struct file *fp; 665 struct mount *mp; 666 struct statfs *sp; 667 int error; 668 669 /* getvnode() will use the descriptor for us */ 670 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 671 return (error); 672 mp = ((struct vnode *)fp->f_data)->v_mount; 673 sp = &mp->mnt_stat; 674 if ((error = VFS_STATFS(mp, sp, p)) != 0) 675 goto out; 676 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 677 sp->f_oflags = sp->f_flags & 0xffff; 678 error = copyout(sp, SCARG(uap, buf), sizeof(*sp)); 679 out: 680 FILE_UNUSE(fp, p); 681 return (error); 682 } 683 684 /* 685 * Get statistics on all filesystems. 686 */ 687 int 688 sys_getfsstat(p, v, retval) 689 struct proc *p; 690 void *v; 691 register_t *retval; 692 { 693 struct sys_getfsstat_args /* { 694 syscallarg(struct statfs *) buf; 695 syscallarg(long) bufsize; 696 syscallarg(int) flags; 697 } */ *uap = v; 698 struct mount *mp, *nmp; 699 struct statfs *sp; 700 caddr_t sfsp; 701 long count, maxcount, error; 702 703 maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); 704 sfsp = (caddr_t)SCARG(uap, buf); 705 simple_lock(&mountlist_slock); 706 count = 0; 707 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 708 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 709 nmp = mp->mnt_list.cqe_next; 710 continue; 711 } 712 if (sfsp && count < maxcount) { 713 sp = &mp->mnt_stat; 714 /* 715 * If MNT_NOWAIT or MNT_LAZY is specified, do not 716 * refresh the fsstat cache. MNT_WAIT or MNT_LAXY 717 * overrides MNT_NOWAIT. 718 */ 719 if (SCARG(uap, flags) != MNT_NOWAIT && 720 SCARG(uap, flags) != MNT_LAZY && 721 (SCARG(uap, flags) == MNT_WAIT || 722 SCARG(uap, flags) == 0) && 723 (error = VFS_STATFS(mp, sp, p)) != 0) { 724 simple_lock(&mountlist_slock); 725 nmp = mp->mnt_list.cqe_next; 726 vfs_unbusy(mp); 727 continue; 728 } 729 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 730 sp->f_oflags = sp->f_flags & 0xffff; 731 error = copyout(sp, sfsp, sizeof(*sp)); 732 if (error) { 733 vfs_unbusy(mp); 734 return (error); 735 } 736 sfsp += sizeof(*sp); 737 } 738 count++; 739 simple_lock(&mountlist_slock); 740 nmp = mp->mnt_list.cqe_next; 741 vfs_unbusy(mp); 742 } 743 simple_unlock(&mountlist_slock); 744 if (sfsp && count > maxcount) 745 *retval = maxcount; 746 else 747 *retval = count; 748 return (0); 749 } 750 751 /* 752 * Change current working directory to a given file descriptor. 753 */ 754 /* ARGSUSED */ 755 int 756 sys_fchdir(p, v, retval) 757 struct proc *p; 758 void *v; 759 register_t *retval; 760 { 761 struct sys_fchdir_args /* { 762 syscallarg(int) fd; 763 } */ *uap = v; 764 struct filedesc *fdp = p->p_fd; 765 struct cwdinfo *cwdi = p->p_cwdi; 766 struct vnode *vp, *tdp; 767 struct mount *mp; 768 struct file *fp; 769 int error; 770 771 /* getvnode() will use the descriptor for us */ 772 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 773 return (error); 774 vp = (struct vnode *)fp->f_data; 775 776 VREF(vp); 777 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 778 if (vp->v_type != VDIR) 779 error = ENOTDIR; 780 else 781 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 782 while (!error && (mp = vp->v_mountedhere) != NULL) { 783 if (vfs_busy(mp, 0, 0)) 784 continue; 785 error = VFS_ROOT(mp, &tdp); 786 vfs_unbusy(mp); 787 if (error) 788 break; 789 vput(vp); 790 vp = tdp; 791 } 792 if (error) { 793 vput(vp); 794 goto out; 795 } 796 VOP_UNLOCK(vp, 0); 797 798 /* 799 * Disallow changing to a directory not under the process's 800 * current root directory (if there is one). 801 */ 802 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { 803 vrele(vp); 804 error = EPERM; /* operation not permitted */ 805 goto out; 806 } 807 808 vrele(cwdi->cwdi_cdir); 809 cwdi->cwdi_cdir = vp; 810 out: 811 FILE_UNUSE(fp, p); 812 return (error); 813 } 814 815 /* 816 * Change this process's notion of the root directory to a given file descriptor. 817 */ 818 819 int 820 sys_fchroot(p, v, retval) 821 struct proc *p; 822 void *v; 823 register_t *retval; 824 { 825 struct sys_fchroot_args *uap = v; 826 struct filedesc *fdp = p->p_fd; 827 struct cwdinfo *cwdi = p->p_cwdi; 828 struct vnode *vp; 829 struct file *fp; 830 int error; 831 832 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 833 return error; 834 /* getvnode() will use the descriptor for us */ 835 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 836 return error; 837 vp = (struct vnode *) fp->f_data; 838 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 839 if (vp->v_type != VDIR) 840 error = ENOTDIR; 841 else 842 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 843 VOP_UNLOCK(vp, 0); 844 if (error) 845 goto out; 846 VREF(vp); 847 848 /* 849 * Prevent escaping from chroot by putting the root under 850 * the working directory. Silently chdir to / if we aren't 851 * already there. 852 */ 853 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 854 /* 855 * XXX would be more failsafe to change directory to a 856 * deadfs node here instead 857 */ 858 vrele(cwdi->cwdi_cdir); 859 VREF(vp); 860 cwdi->cwdi_cdir = vp; 861 } 862 863 if (cwdi->cwdi_rdir != NULL) 864 vrele(cwdi->cwdi_rdir); 865 cwdi->cwdi_rdir = vp; 866 out: 867 FILE_UNUSE(fp, p); 868 return (error); 869 } 870 871 872 873 /* 874 * Change current working directory (``.''). 875 */ 876 /* ARGSUSED */ 877 int 878 sys_chdir(p, v, retval) 879 struct proc *p; 880 void *v; 881 register_t *retval; 882 { 883 struct sys_chdir_args /* { 884 syscallarg(const char *) path; 885 } */ *uap = v; 886 struct cwdinfo *cwdi = p->p_cwdi; 887 int error; 888 struct nameidata nd; 889 890 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 891 SCARG(uap, path), p); 892 if ((error = change_dir(&nd, p)) != 0) 893 return (error); 894 vrele(cwdi->cwdi_cdir); 895 cwdi->cwdi_cdir = nd.ni_vp; 896 return (0); 897 } 898 899 /* 900 * Change notion of root (``/'') directory. 901 */ 902 /* ARGSUSED */ 903 int 904 sys_chroot(p, v, retval) 905 struct proc *p; 906 void *v; 907 register_t *retval; 908 { 909 struct sys_chroot_args /* { 910 syscallarg(const char *) path; 911 } */ *uap = v; 912 struct cwdinfo *cwdi = p->p_cwdi; 913 struct vnode *vp; 914 int error; 915 struct nameidata nd; 916 917 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 918 return (error); 919 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 920 SCARG(uap, path), p); 921 if ((error = change_dir(&nd, p)) != 0) 922 return (error); 923 if (cwdi->cwdi_rdir != NULL) 924 vrele(cwdi->cwdi_rdir); 925 vp = nd.ni_vp; 926 cwdi->cwdi_rdir = vp; 927 928 /* 929 * Prevent escaping from chroot by putting the root under 930 * the working directory. Silently chdir to / if we aren't 931 * already there. 932 */ 933 if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { 934 /* 935 * XXX would be more failsafe to change directory to a 936 * deadfs node here instead 937 */ 938 vrele(cwdi->cwdi_cdir); 939 VREF(vp); 940 cwdi->cwdi_cdir = vp; 941 } 942 943 return (0); 944 } 945 946 /* 947 * Common routine for chroot and chdir. 948 */ 949 static int 950 change_dir(ndp, p) 951 struct nameidata *ndp; 952 struct proc *p; 953 { 954 struct vnode *vp; 955 int error; 956 957 if ((error = namei(ndp)) != 0) 958 return (error); 959 vp = ndp->ni_vp; 960 if (vp->v_type != VDIR) 961 error = ENOTDIR; 962 else 963 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 964 965 if (error) 966 vput(vp); 967 else 968 VOP_UNLOCK(vp, 0); 969 return (error); 970 } 971 972 /* 973 * Check permissions, allocate an open file structure, 974 * and call the device open routine if any. 975 */ 976 int 977 sys_open(p, v, retval) 978 struct proc *p; 979 void *v; 980 register_t *retval; 981 { 982 struct sys_open_args /* { 983 syscallarg(const char *) path; 984 syscallarg(int) flags; 985 syscallarg(int) mode; 986 } */ *uap = v; 987 struct cwdinfo *cwdi = p->p_cwdi; 988 struct filedesc *fdp = p->p_fd; 989 struct file *fp; 990 struct vnode *vp; 991 int flags, cmode; 992 int type, indx, error; 993 struct flock lf; 994 struct nameidata nd; 995 996 flags = FFLAGS(SCARG(uap, flags)); 997 if ((flags & (FREAD | FWRITE)) == 0) 998 return (EINVAL); 999 /* falloc() will use the file descriptor for us */ 1000 if ((error = falloc(p, &fp, &indx)) != 0) 1001 return (error); 1002 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1003 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1004 p->p_dupfd = -indx - 1; /* XXX check for fdopen */ 1005 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1006 FILE_UNUSE(fp, p); 1007 ffree(fp); 1008 if ((error == ENODEV || error == ENXIO) && 1009 p->p_dupfd >= 0 && /* XXX from fdopen */ 1010 (error = 1011 dupfdopen(p, indx, p->p_dupfd, flags, error)) == 0) { 1012 *retval = indx; 1013 return (0); 1014 } 1015 if (error == ERESTART) 1016 error = EINTR; 1017 fdremove(fdp, indx); 1018 return (error); 1019 } 1020 p->p_dupfd = 0; 1021 vp = nd.ni_vp; 1022 fp->f_flag = flags & FMASK; 1023 fp->f_type = DTYPE_VNODE; 1024 fp->f_ops = &vnops; 1025 fp->f_data = (caddr_t)vp; 1026 if (flags & (O_EXLOCK | O_SHLOCK)) { 1027 lf.l_whence = SEEK_SET; 1028 lf.l_start = 0; 1029 lf.l_len = 0; 1030 if (flags & O_EXLOCK) 1031 lf.l_type = F_WRLCK; 1032 else 1033 lf.l_type = F_RDLCK; 1034 type = F_FLOCK; 1035 if ((flags & FNONBLOCK) == 0) 1036 type |= F_WAIT; 1037 VOP_UNLOCK(vp, 0); 1038 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1039 if (error) { 1040 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1041 FILE_UNUSE(fp, p); 1042 ffree(fp); 1043 fdremove(fdp, indx); 1044 return (error); 1045 } 1046 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1047 fp->f_flag |= FHASLOCK; 1048 } 1049 VOP_UNLOCK(vp, 0); 1050 *retval = indx; 1051 FILE_UNUSE(fp, p); 1052 return (0); 1053 } 1054 1055 /* 1056 * Get file handle system call 1057 */ 1058 int 1059 sys_getfh(p, v, retval) 1060 struct proc *p; 1061 void *v; 1062 register_t *retval; 1063 { 1064 struct sys_getfh_args /* { 1065 syscallarg(char *) fname; 1066 syscallarg(fhandle_t *) fhp; 1067 } */ *uap = v; 1068 struct vnode *vp; 1069 fhandle_t fh; 1070 int error; 1071 struct nameidata nd; 1072 1073 /* 1074 * Must be super user 1075 */ 1076 error = suser(p->p_ucred, &p->p_acflag); 1077 if (error) 1078 return (error); 1079 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1080 SCARG(uap, fname), p); 1081 error = namei(&nd); 1082 if (error) 1083 return (error); 1084 vp = nd.ni_vp; 1085 memset((caddr_t)&fh, 0, sizeof(fh)); 1086 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 1087 error = VFS_VPTOFH(vp, &fh.fh_fid); 1088 vput(vp); 1089 if (error) 1090 return (error); 1091 error = copyout((caddr_t)&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); 1092 return (error); 1093 } 1094 1095 /* 1096 * Open a file given a file handle. 1097 * 1098 * Check permissions, allocate an open file structure, 1099 * and call the device open routine if any. 1100 */ 1101 int 1102 sys_fhopen(p, v, retval) 1103 struct proc *p; 1104 void *v; 1105 register_t *retval; 1106 { 1107 struct sys_fhopen_args /* { 1108 syscallarg(const fhandle_t *) fhp; 1109 syscallarg(int) flags; 1110 } */ *uap = v; 1111 struct filedesc *fdp = p->p_fd; 1112 struct file *fp; 1113 struct vnode *vp = NULL; 1114 struct mount *mp; 1115 struct ucred *cred = p->p_ucred; 1116 int flags; 1117 struct file *nfp; 1118 int type, indx, error=0; 1119 struct flock lf; 1120 struct vattr va; 1121 fhandle_t fh; 1122 1123 /* 1124 * Must be super user 1125 */ 1126 if ((error = suser(p->p_ucred, &p->p_acflag))) 1127 return (error); 1128 1129 flags = FFLAGS(SCARG(uap, flags)); 1130 if ((flags & (FREAD | FWRITE)) == 0) 1131 return (EINVAL); 1132 if ((flags & O_CREAT)) 1133 return (EINVAL); 1134 /* falloc() will use the file descriptor for us */ 1135 if ((error = falloc(p, &nfp, &indx)) != 0) 1136 return (error); 1137 fp = nfp; 1138 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1139 goto bad; 1140 1141 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { 1142 error = ESTALE; 1143 goto bad; 1144 } 1145 1146 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { 1147 vp = NULL; /* most likely unnecessary sanity for bad: */ 1148 goto bad; 1149 } 1150 1151 /* Now do an effective vn_open */ 1152 1153 if (vp->v_type == VSOCK) { 1154 error = EOPNOTSUPP; 1155 goto bad; 1156 } 1157 if (flags & FREAD) { 1158 if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) 1159 goto bad; 1160 } 1161 if (flags & (FWRITE | O_TRUNC)) { 1162 if (vp->v_type == VDIR) { 1163 error = EISDIR; 1164 goto bad; 1165 } 1166 if ((error = vn_writechk(vp)) != 0 || 1167 (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) 1168 goto bad; 1169 } 1170 if (flags & O_TRUNC) { 1171 VOP_UNLOCK(vp, 0); /* XXX */ 1172 VOP_LEASE(vp, p, cred, LEASE_WRITE); 1173 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1174 VATTR_NULL(&va); 1175 va.va_size = 0; 1176 if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0) 1177 goto bad; 1178 } 1179 if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) 1180 goto bad; 1181 if (flags & FWRITE) 1182 vp->v_writecount++; 1183 1184 /* done with modified vn_open, now finish what sys_open does. */ 1185 1186 fp->f_flag = flags & FMASK; 1187 fp->f_type = DTYPE_VNODE; 1188 fp->f_ops = &vnops; 1189 fp->f_data = (caddr_t)vp; 1190 if (flags & (O_EXLOCK | O_SHLOCK)) { 1191 lf.l_whence = SEEK_SET; 1192 lf.l_start = 0; 1193 lf.l_len = 0; 1194 if (flags & O_EXLOCK) 1195 lf.l_type = F_WRLCK; 1196 else 1197 lf.l_type = F_RDLCK; 1198 type = F_FLOCK; 1199 if ((flags & FNONBLOCK) == 0) 1200 type |= F_WAIT; 1201 VOP_UNLOCK(vp, 0); 1202 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type); 1203 if (error) { 1204 (void) vn_close(vp, fp->f_flag, fp->f_cred, p); 1205 FILE_UNUSE(fp, p); 1206 ffree(fp); 1207 fdremove(fdp, indx); 1208 return (error); 1209 } 1210 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1211 fp->f_flag |= FHASLOCK; 1212 } 1213 VOP_UNLOCK(vp, 0); 1214 *retval = indx; 1215 FILE_UNUSE(fp, p); 1216 return (0); 1217 1218 bad: 1219 FILE_UNUSE(fp, p); 1220 ffree(fp); 1221 fdremove(fdp, indx); 1222 if (vp != NULL) 1223 vput(vp); 1224 return (error); 1225 } 1226 1227 /* ARGSUSED */ 1228 int 1229 sys_fhstat(p, v, retval) 1230 struct proc *p; 1231 void *v; 1232 register_t *retval; 1233 { 1234 struct sys_fhstat_args /* { 1235 syscallarg(const fhandle_t *) fhp; 1236 syscallarg(struct stat *) sb; 1237 } */ *uap = v; 1238 struct stat sb; 1239 int error; 1240 fhandle_t fh; 1241 struct mount *mp; 1242 struct vnode *vp; 1243 1244 /* 1245 * Must be super user 1246 */ 1247 if ((error = suser(p->p_ucred, &p->p_acflag))) 1248 return (error); 1249 1250 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1251 return (error); 1252 1253 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1254 return (ESTALE); 1255 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1256 return (error); 1257 error = vn_stat(vp, &sb, p); 1258 vput(vp); 1259 if (error) 1260 return (error); 1261 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 1262 return (error); 1263 } 1264 1265 /* ARGSUSED */ 1266 int 1267 sys_fhstatfs(p, v, retval) 1268 struct proc *p; 1269 void *v; 1270 register_t *retval; 1271 { 1272 struct sys_fhstatfs_args /* 1273 syscallarg(const fhandle_t *) fhp; 1274 syscallarg(struct statfs *) buf; 1275 } */ *uap = v; 1276 struct statfs sp; 1277 fhandle_t fh; 1278 struct mount *mp; 1279 struct vnode *vp; 1280 int error; 1281 1282 /* 1283 * Must be super user 1284 */ 1285 if ((error = suser(p->p_ucred, &p->p_acflag))) 1286 return (error); 1287 1288 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 1289 return (error); 1290 1291 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 1292 return (ESTALE); 1293 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 1294 return (error); 1295 mp = vp->v_mount; 1296 vput(vp); 1297 if ((error = VFS_STATFS(mp, &sp, p)) != 0) 1298 return (error); 1299 sp.f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 1300 sp.f_oflags = sp.f_flags & 0xffff; 1301 return (copyout(&sp, SCARG(uap, buf), sizeof(sp))); 1302 } 1303 1304 /* 1305 * Create a special file. 1306 */ 1307 /* ARGSUSED */ 1308 int 1309 sys_mknod(p, v, retval) 1310 struct proc *p; 1311 void *v; 1312 register_t *retval; 1313 { 1314 struct sys_mknod_args /* { 1315 syscallarg(const char *) path; 1316 syscallarg(int) mode; 1317 syscallarg(int) dev; 1318 } */ *uap = v; 1319 struct vnode *vp; 1320 struct vattr vattr; 1321 int error; 1322 int whiteout = 0; 1323 struct nameidata nd; 1324 1325 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1326 return (error); 1327 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1328 if ((error = namei(&nd)) != 0) 1329 return (error); 1330 vp = nd.ni_vp; 1331 if (vp != NULL) 1332 error = EEXIST; 1333 else { 1334 VATTR_NULL(&vattr); 1335 vattr.va_mode = 1336 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1337 vattr.va_rdev = SCARG(uap, dev); 1338 whiteout = 0; 1339 1340 switch (SCARG(uap, mode) & S_IFMT) { 1341 case S_IFMT: /* used by badsect to flag bad sectors */ 1342 vattr.va_type = VBAD; 1343 break; 1344 case S_IFCHR: 1345 vattr.va_type = VCHR; 1346 break; 1347 case S_IFBLK: 1348 vattr.va_type = VBLK; 1349 break; 1350 case S_IFWHT: 1351 whiteout = 1; 1352 break; 1353 default: 1354 error = EINVAL; 1355 break; 1356 } 1357 } 1358 if (!error) { 1359 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1360 if (whiteout) { 1361 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1362 if (error) 1363 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1364 vput(nd.ni_dvp); 1365 } else { 1366 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1367 &nd.ni_cnd, &vattr); 1368 } 1369 } else { 1370 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1371 if (nd.ni_dvp == vp) 1372 vrele(nd.ni_dvp); 1373 else 1374 vput(nd.ni_dvp); 1375 if (vp) 1376 vrele(vp); 1377 } 1378 return (error); 1379 } 1380 1381 /* 1382 * Create a named pipe. 1383 */ 1384 /* ARGSUSED */ 1385 int 1386 sys_mkfifo(p, v, retval) 1387 struct proc *p; 1388 void *v; 1389 register_t *retval; 1390 { 1391 struct sys_mkfifo_args /* { 1392 syscallarg(const char *) path; 1393 syscallarg(int) mode; 1394 } */ *uap = v; 1395 struct vattr vattr; 1396 int error; 1397 struct nameidata nd; 1398 1399 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 1400 if ((error = namei(&nd)) != 0) 1401 return (error); 1402 if (nd.ni_vp != NULL) { 1403 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1404 if (nd.ni_dvp == nd.ni_vp) 1405 vrele(nd.ni_dvp); 1406 else 1407 vput(nd.ni_dvp); 1408 vrele(nd.ni_vp); 1409 return (EEXIST); 1410 } 1411 VATTR_NULL(&vattr); 1412 vattr.va_type = VFIFO; 1413 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1414 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1415 return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr)); 1416 } 1417 1418 /* 1419 * Make a hard file link. 1420 */ 1421 /* ARGSUSED */ 1422 int 1423 sys_link(p, v, retval) 1424 struct proc *p; 1425 void *v; 1426 register_t *retval; 1427 { 1428 struct sys_link_args /* { 1429 syscallarg(const char *) path; 1430 syscallarg(const char *) link; 1431 } */ *uap = v; 1432 struct vnode *vp; 1433 struct nameidata nd; 1434 int error; 1435 1436 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 1437 if ((error = namei(&nd)) != 0) 1438 return (error); 1439 vp = nd.ni_vp; 1440 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1441 if ((error = namei(&nd)) != 0) 1442 goto out; 1443 if (nd.ni_vp) { 1444 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1445 if (nd.ni_dvp == nd.ni_vp) 1446 vrele(nd.ni_dvp); 1447 else 1448 vput(nd.ni_dvp); 1449 vrele(nd.ni_vp); 1450 error = EEXIST; 1451 goto out; 1452 } 1453 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1454 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1455 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1456 out: 1457 vrele(vp); 1458 return (error); 1459 } 1460 1461 /* 1462 * Make a symbolic link. 1463 */ 1464 /* ARGSUSED */ 1465 int 1466 sys_symlink(p, v, retval) 1467 struct proc *p; 1468 void *v; 1469 register_t *retval; 1470 { 1471 struct sys_symlink_args /* { 1472 syscallarg(const char *) path; 1473 syscallarg(const char *) link; 1474 } */ *uap = v; 1475 struct vattr vattr; 1476 char *path; 1477 int error; 1478 struct nameidata nd; 1479 1480 MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1481 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1482 if (error) 1483 goto out; 1484 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); 1485 if ((error = namei(&nd)) != 0) 1486 goto out; 1487 if (nd.ni_vp) { 1488 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1489 if (nd.ni_dvp == nd.ni_vp) 1490 vrele(nd.ni_dvp); 1491 else 1492 vput(nd.ni_dvp); 1493 vrele(nd.ni_vp); 1494 error = EEXIST; 1495 goto out; 1496 } 1497 VATTR_NULL(&vattr); 1498 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1499 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1500 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1501 out: 1502 FREE(path, M_NAMEI); 1503 return (error); 1504 } 1505 1506 /* 1507 * Delete a whiteout from the filesystem. 1508 */ 1509 /* ARGSUSED */ 1510 int 1511 sys_undelete(p, v, retval) 1512 struct proc *p; 1513 void *v; 1514 register_t *retval; 1515 { 1516 struct sys_undelete_args /* { 1517 syscallarg(const char *) path; 1518 } */ *uap = v; 1519 int error; 1520 struct nameidata nd; 1521 1522 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1523 SCARG(uap, path), p); 1524 error = namei(&nd); 1525 if (error) 1526 return (error); 1527 1528 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1529 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1530 if (nd.ni_dvp == nd.ni_vp) 1531 vrele(nd.ni_dvp); 1532 else 1533 vput(nd.ni_dvp); 1534 if (nd.ni_vp) 1535 vrele(nd.ni_vp); 1536 return (EEXIST); 1537 } 1538 1539 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1540 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 1541 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1542 vput(nd.ni_dvp); 1543 return (error); 1544 } 1545 1546 /* 1547 * Delete a name from the filesystem. 1548 */ 1549 /* ARGSUSED */ 1550 int 1551 sys_unlink(p, v, retval) 1552 struct proc *p; 1553 void *v; 1554 register_t *retval; 1555 { 1556 struct sys_unlink_args /* { 1557 syscallarg(const char *) path; 1558 } */ *uap = v; 1559 struct vnode *vp; 1560 int error; 1561 struct nameidata nd; 1562 1563 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 1564 SCARG(uap, path), p); 1565 if ((error = namei(&nd)) != 0) 1566 return (error); 1567 vp = nd.ni_vp; 1568 1569 /* 1570 * The root of a mounted filesystem cannot be deleted. 1571 */ 1572 if (vp->v_flag & VROOT) { 1573 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1574 if (nd.ni_dvp == vp) 1575 vrele(nd.ni_dvp); 1576 else 1577 vput(nd.ni_dvp); 1578 vput(vp); 1579 error = EBUSY; 1580 goto out; 1581 } 1582 1583 (void)uvm_vnp_uncache(vp); 1584 1585 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 1586 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 1587 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 1588 out: 1589 return (error); 1590 } 1591 1592 /* 1593 * Reposition read/write file offset. 1594 */ 1595 int 1596 sys_lseek(p, v, retval) 1597 struct proc *p; 1598 void *v; 1599 register_t *retval; 1600 { 1601 struct sys_lseek_args /* { 1602 syscallarg(int) fd; 1603 syscallarg(int) pad; 1604 syscallarg(off_t) offset; 1605 syscallarg(int) whence; 1606 } */ *uap = v; 1607 struct ucred *cred = p->p_ucred; 1608 struct filedesc *fdp = p->p_fd; 1609 struct file *fp; 1610 struct vnode *vp; 1611 struct vattr vattr; 1612 off_t newoff; 1613 int error; 1614 1615 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 1616 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL || 1617 (fp->f_iflags & FIF_WANTCLOSE) != 0) 1618 return (EBADF); 1619 1620 FILE_USE(fp); 1621 1622 vp = (struct vnode *)fp->f_data; 1623 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1624 error = ESPIPE; 1625 goto out; 1626 } 1627 1628 switch (SCARG(uap, whence)) { 1629 case SEEK_CUR: 1630 newoff = fp->f_offset + SCARG(uap, offset); 1631 break; 1632 case SEEK_END: 1633 error = VOP_GETATTR(vp, &vattr, cred, p); 1634 if (error) 1635 goto out; 1636 newoff = SCARG(uap, offset) + vattr.va_size; 1637 break; 1638 case SEEK_SET: 1639 newoff = SCARG(uap, offset); 1640 break; 1641 default: 1642 error = EINVAL; 1643 goto out; 1644 } 1645 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 1646 goto out; 1647 1648 *(off_t *)retval = fp->f_offset = newoff; 1649 out: 1650 FILE_UNUSE(fp, p); 1651 return (error); 1652 } 1653 1654 /* 1655 * Positional read system call. 1656 */ 1657 int 1658 sys_pread(p, v, retval) 1659 struct proc *p; 1660 void *v; 1661 register_t *retval; 1662 { 1663 struct sys_pread_args /* { 1664 syscallarg(int) fd; 1665 syscallarg(void *) buf; 1666 syscallarg(size_t) nbyte; 1667 syscallarg(off_t) offset; 1668 } */ *uap = v; 1669 struct filedesc *fdp = p->p_fd; 1670 struct file *fp; 1671 struct vnode *vp; 1672 off_t offset; 1673 int error, fd = SCARG(uap, fd); 1674 1675 if ((u_int)fd >= fdp->fd_nfiles || 1676 (fp = fdp->fd_ofiles[fd]) == NULL || 1677 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1678 (fp->f_flag & FREAD) == 0) 1679 return (EBADF); 1680 1681 FILE_USE(fp); 1682 1683 vp = (struct vnode *)fp->f_data; 1684 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1685 error = ESPIPE; 1686 goto out; 1687 } 1688 1689 offset = SCARG(uap, offset); 1690 1691 /* 1692 * XXX This works because no file systems actually 1693 * XXX take any action on the seek operation. 1694 */ 1695 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1696 goto out; 1697 1698 /* dofileread() will unuse the descriptor for us */ 1699 return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1700 &offset, 0, retval)); 1701 1702 out: 1703 FILE_UNUSE(fp, p); 1704 return (error); 1705 } 1706 1707 /* 1708 * Positional scatter read system call. 1709 */ 1710 int 1711 sys_preadv(p, v, retval) 1712 struct proc *p; 1713 void *v; 1714 register_t *retval; 1715 { 1716 struct sys_preadv_args /* { 1717 syscallarg(int) fd; 1718 syscallarg(const struct iovec *) iovp; 1719 syscallarg(int) iovcnt; 1720 syscallarg(off_t) offset; 1721 } */ *uap = v; 1722 struct filedesc *fdp = p->p_fd; 1723 struct file *fp; 1724 struct vnode *vp; 1725 off_t offset; 1726 int error, fd = SCARG(uap, fd); 1727 1728 if ((u_int)fd >= fdp->fd_nfiles || 1729 (fp = fdp->fd_ofiles[fd]) == NULL || 1730 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1731 (fp->f_flag & FREAD) == 0) 1732 return (EBADF); 1733 1734 FILE_USE(fp); 1735 1736 vp = (struct vnode *)fp->f_data; 1737 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1738 error = ESPIPE; 1739 goto out; 1740 } 1741 1742 offset = SCARG(uap, offset); 1743 1744 /* 1745 * XXX This works because no file systems actually 1746 * XXX take any action on the seek operation. 1747 */ 1748 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1749 goto out; 1750 1751 /* dofilereadv() will unuse the descriptor for us */ 1752 return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1753 &offset, 0, retval)); 1754 1755 out: 1756 FILE_UNUSE(fp, p); 1757 return (error); 1758 } 1759 1760 /* 1761 * Positional write system call. 1762 */ 1763 int 1764 sys_pwrite(p, v, retval) 1765 struct proc *p; 1766 void *v; 1767 register_t *retval; 1768 { 1769 struct sys_pwrite_args /* { 1770 syscallarg(int) fd; 1771 syscallarg(const void *) buf; 1772 syscallarg(size_t) nbyte; 1773 syscallarg(off_t) offset; 1774 } */ *uap = v; 1775 struct filedesc *fdp = p->p_fd; 1776 struct file *fp; 1777 struct vnode *vp; 1778 off_t offset; 1779 int error, fd = SCARG(uap, fd); 1780 1781 if ((u_int)fd >= fdp->fd_nfiles || 1782 (fp = fdp->fd_ofiles[fd]) == NULL || 1783 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1784 (fp->f_flag & FWRITE) == 0) 1785 return (EBADF); 1786 1787 FILE_USE(fp); 1788 1789 vp = (struct vnode *)fp->f_data; 1790 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1791 error = ESPIPE; 1792 goto out; 1793 } 1794 1795 offset = SCARG(uap, offset); 1796 1797 /* 1798 * XXX This works because no file systems actually 1799 * XXX take any action on the seek operation. 1800 */ 1801 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1802 goto out; 1803 1804 /* dofilewrite() will unuse the descriptor for us */ 1805 return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 1806 &offset, 0, retval)); 1807 1808 out: 1809 FILE_UNUSE(fp, p); 1810 return (error); 1811 } 1812 1813 /* 1814 * Positional gather write system call. 1815 */ 1816 int 1817 sys_pwritev(p, v, retval) 1818 struct proc *p; 1819 void *v; 1820 register_t *retval; 1821 { 1822 struct sys_pwritev_args /* { 1823 syscallarg(int) fd; 1824 syscallarg(const struct iovec *) iovp; 1825 syscallarg(int) iovcnt; 1826 syscallarg(off_t) offset; 1827 } */ *uap = v; 1828 struct filedesc *fdp = p->p_fd; 1829 struct file *fp; 1830 struct vnode *vp; 1831 off_t offset; 1832 int error, fd = SCARG(uap, fd); 1833 1834 if ((u_int)fd >= fdp->fd_nfiles || 1835 (fp = fdp->fd_ofiles[fd]) == NULL || 1836 (fp->f_iflags & FIF_WANTCLOSE) != 0 || 1837 (fp->f_flag & FWRITE) == 0) 1838 return (EBADF); 1839 1840 FILE_USE(fp); 1841 1842 vp = (struct vnode *)fp->f_data; 1843 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 1844 error = ESPIPE; 1845 goto out; 1846 } 1847 1848 offset = SCARG(uap, offset); 1849 1850 /* 1851 * XXX This works because no file systems actually 1852 * XXX take any action on the seek operation. 1853 */ 1854 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 1855 goto out; 1856 1857 /* dofilewritev() will unuse the descriptor for us */ 1858 return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 1859 &offset, 0, retval)); 1860 1861 out: 1862 FILE_UNUSE(fp, p); 1863 return (error); 1864 } 1865 1866 /* 1867 * Check access permissions. 1868 */ 1869 int 1870 sys_access(p, v, retval) 1871 struct proc *p; 1872 void *v; 1873 register_t *retval; 1874 { 1875 struct sys_access_args /* { 1876 syscallarg(const char *) path; 1877 syscallarg(int) flags; 1878 } */ *uap = v; 1879 struct ucred *cred = p->p_ucred; 1880 struct vnode *vp; 1881 int error, flags, t_gid, t_uid; 1882 struct nameidata nd; 1883 1884 t_uid = cred->cr_uid; 1885 t_gid = cred->cr_gid; 1886 cred->cr_uid = p->p_cred->p_ruid; 1887 cred->cr_gid = p->p_cred->p_rgid; 1888 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1889 SCARG(uap, path), p); 1890 if ((error = namei(&nd)) != 0) 1891 goto out1; 1892 vp = nd.ni_vp; 1893 1894 /* Flags == 0 means only check for existence. */ 1895 if (SCARG(uap, flags)) { 1896 flags = 0; 1897 if (SCARG(uap, flags) & R_OK) 1898 flags |= VREAD; 1899 if (SCARG(uap, flags) & W_OK) 1900 flags |= VWRITE; 1901 if (SCARG(uap, flags) & X_OK) 1902 flags |= VEXEC; 1903 1904 error = VOP_ACCESS(vp, flags, cred, p); 1905 if (!error && (flags & VWRITE)) 1906 error = vn_writechk(vp); 1907 } 1908 vput(vp); 1909 out1: 1910 cred->cr_uid = t_uid; 1911 cred->cr_gid = t_gid; 1912 return (error); 1913 } 1914 1915 /* 1916 * Get file status; this version follows links. 1917 */ 1918 /* ARGSUSED */ 1919 int 1920 sys___stat13(p, v, retval) 1921 struct proc *p; 1922 void *v; 1923 register_t *retval; 1924 { 1925 struct sys___stat13_args /* { 1926 syscallarg(const char *) path; 1927 syscallarg(struct stat *) ub; 1928 } */ *uap = v; 1929 struct stat sb; 1930 int error; 1931 struct nameidata nd; 1932 1933 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1934 SCARG(uap, path), p); 1935 if ((error = namei(&nd)) != 0) 1936 return (error); 1937 error = vn_stat(nd.ni_vp, &sb, p); 1938 vput(nd.ni_vp); 1939 if (error) 1940 return (error); 1941 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1942 return (error); 1943 } 1944 1945 /* 1946 * Get file status; this version does not follow links. 1947 */ 1948 /* ARGSUSED */ 1949 int 1950 sys___lstat13(p, v, retval) 1951 struct proc *p; 1952 void *v; 1953 register_t *retval; 1954 { 1955 struct sys___lstat13_args /* { 1956 syscallarg(const char *) path; 1957 syscallarg(struct stat *) ub; 1958 } */ *uap = v; 1959 struct stat sb; 1960 int error; 1961 struct nameidata nd; 1962 1963 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 1964 SCARG(uap, path), p); 1965 if ((error = namei(&nd)) != 0) 1966 return (error); 1967 error = vn_stat(nd.ni_vp, &sb, p); 1968 vput(nd.ni_vp); 1969 if (error) 1970 return (error); 1971 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 1972 return (error); 1973 } 1974 1975 /* 1976 * Get configurable pathname variables. 1977 */ 1978 /* ARGSUSED */ 1979 int 1980 sys_pathconf(p, v, retval) 1981 struct proc *p; 1982 void *v; 1983 register_t *retval; 1984 { 1985 struct sys_pathconf_args /* { 1986 syscallarg(const char *) path; 1987 syscallarg(int) name; 1988 } */ *uap = v; 1989 int error; 1990 struct nameidata nd; 1991 1992 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1993 SCARG(uap, path), p); 1994 if ((error = namei(&nd)) != 0) 1995 return (error); 1996 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 1997 vput(nd.ni_vp); 1998 return (error); 1999 } 2000 2001 /* 2002 * Return target name of a symbolic link. 2003 */ 2004 /* ARGSUSED */ 2005 int 2006 sys_readlink(p, v, retval) 2007 struct proc *p; 2008 void *v; 2009 register_t *retval; 2010 { 2011 struct sys_readlink_args /* { 2012 syscallarg(const char *) path; 2013 syscallarg(char *) buf; 2014 syscallarg(size_t) count; 2015 } */ *uap = v; 2016 struct vnode *vp; 2017 struct iovec aiov; 2018 struct uio auio; 2019 int error; 2020 struct nameidata nd; 2021 2022 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2023 SCARG(uap, path), p); 2024 if ((error = namei(&nd)) != 0) 2025 return (error); 2026 vp = nd.ni_vp; 2027 if (vp->v_type != VLNK) 2028 error = EINVAL; 2029 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2030 (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { 2031 aiov.iov_base = SCARG(uap, buf); 2032 aiov.iov_len = SCARG(uap, count); 2033 auio.uio_iov = &aiov; 2034 auio.uio_iovcnt = 1; 2035 auio.uio_offset = 0; 2036 auio.uio_rw = UIO_READ; 2037 auio.uio_segflg = UIO_USERSPACE; 2038 auio.uio_procp = p; 2039 auio.uio_resid = SCARG(uap, count); 2040 error = VOP_READLINK(vp, &auio, p->p_ucred); 2041 } 2042 vput(vp); 2043 *retval = SCARG(uap, count) - auio.uio_resid; 2044 return (error); 2045 } 2046 2047 /* 2048 * Change flags of a file given a path name. 2049 */ 2050 /* ARGSUSED */ 2051 int 2052 sys_chflags(p, v, retval) 2053 struct proc *p; 2054 void *v; 2055 register_t *retval; 2056 { 2057 struct sys_chflags_args /* { 2058 syscallarg(const char *) path; 2059 syscallarg(u_long) flags; 2060 } */ *uap = v; 2061 struct vnode *vp; 2062 struct vattr vattr; 2063 int error; 2064 struct nameidata nd; 2065 2066 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2067 if ((error = namei(&nd)) != 0) 2068 return (error); 2069 vp = nd.ni_vp; 2070 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2071 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2072 /* Non-superusers cannot change the flags on devices, even if they 2073 own them. */ 2074 if (suser(p->p_ucred, &p->p_acflag)) { 2075 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2076 goto out; 2077 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2078 error = EINVAL; 2079 goto out; 2080 } 2081 } 2082 VATTR_NULL(&vattr); 2083 vattr.va_flags = SCARG(uap, flags); 2084 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2085 out: 2086 vput(vp); 2087 return (error); 2088 } 2089 2090 /* 2091 * Change flags of a file given a file descriptor. 2092 */ 2093 /* ARGSUSED */ 2094 int 2095 sys_fchflags(p, v, retval) 2096 struct proc *p; 2097 void *v; 2098 register_t *retval; 2099 { 2100 struct sys_fchflags_args /* { 2101 syscallarg(int) fd; 2102 syscallarg(u_long) flags; 2103 } */ *uap = v; 2104 struct vattr vattr; 2105 struct vnode *vp; 2106 struct file *fp; 2107 int error; 2108 2109 /* getvnode() will use the descriptor for us */ 2110 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2111 return (error); 2112 vp = (struct vnode *)fp->f_data; 2113 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2114 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2115 /* Non-superusers cannot change the flags on devices, even if they 2116 own them. */ 2117 if (suser(p->p_ucred, &p->p_acflag)) { 2118 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) 2119 != 0) 2120 goto out; 2121 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2122 error = EINVAL; 2123 goto out; 2124 } 2125 } 2126 VATTR_NULL(&vattr); 2127 vattr.va_flags = SCARG(uap, flags); 2128 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2129 out: 2130 VOP_UNLOCK(vp, 0); 2131 FILE_UNUSE(fp, p); 2132 return (error); 2133 } 2134 2135 /* 2136 * Change flags of a file given a file descriptor; this version does 2137 * not follow links. 2138 */ 2139 int 2140 sys_lchflags(p, v, retval) 2141 struct proc *p; 2142 void *v; 2143 register_t *retval; 2144 { 2145 register struct sys_chflags_args /* { 2146 syscallarg(const char *) path; 2147 syscallarg(u_long) flags; 2148 } */ *uap = v; 2149 register struct vnode *vp; 2150 struct vattr vattr; 2151 int error; 2152 struct nameidata nd; 2153 2154 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2155 if ((error = namei(&nd)) != 0) 2156 return (error); 2157 vp = nd.ni_vp; 2158 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2159 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2160 /* Non-superusers cannot change the flags on devices, even if they 2161 own them. */ 2162 if (suser(p->p_ucred, &p->p_acflag)) { 2163 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2164 goto out; 2165 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2166 error = EINVAL; 2167 goto out; 2168 } 2169 } 2170 VATTR_NULL(&vattr); 2171 vattr.va_flags = SCARG(uap, flags); 2172 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2173 out: 2174 vput(vp); 2175 return (error); 2176 } 2177 2178 /* 2179 * Change mode of a file given path name; this version follows links. 2180 */ 2181 /* ARGSUSED */ 2182 int 2183 sys_chmod(p, v, retval) 2184 struct proc *p; 2185 void *v; 2186 register_t *retval; 2187 { 2188 struct sys_chmod_args /* { 2189 syscallarg(const char *) path; 2190 syscallarg(int) mode; 2191 } */ *uap = v; 2192 int error; 2193 struct nameidata nd; 2194 2195 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2196 if ((error = namei(&nd)) != 0) 2197 return (error); 2198 2199 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2200 2201 vrele(nd.ni_vp); 2202 return (error); 2203 } 2204 2205 /* 2206 * Change mode of a file given a file descriptor. 2207 */ 2208 /* ARGSUSED */ 2209 int 2210 sys_fchmod(p, v, retval) 2211 struct proc *p; 2212 void *v; 2213 register_t *retval; 2214 { 2215 struct sys_fchmod_args /* { 2216 syscallarg(int) fd; 2217 syscallarg(int) mode; 2218 } */ *uap = v; 2219 struct file *fp; 2220 int error; 2221 2222 /* getvnode() will use the descriptor for us */ 2223 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2224 return (error); 2225 2226 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); 2227 FILE_UNUSE(fp, p); 2228 return (error); 2229 } 2230 2231 /* 2232 * Change mode of a file given path name; this version does not follow links. 2233 */ 2234 /* ARGSUSED */ 2235 int 2236 sys_lchmod(p, v, retval) 2237 struct proc *p; 2238 void *v; 2239 register_t *retval; 2240 { 2241 struct sys_lchmod_args /* { 2242 syscallarg(const char *) path; 2243 syscallarg(int) mode; 2244 } */ *uap = v; 2245 int error; 2246 struct nameidata nd; 2247 2248 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2249 if ((error = namei(&nd)) != 0) 2250 return (error); 2251 2252 error = change_mode(nd.ni_vp, SCARG(uap, mode), p); 2253 2254 vrele(nd.ni_vp); 2255 return (error); 2256 } 2257 2258 /* 2259 * Common routine to set mode given a vnode. 2260 */ 2261 static int 2262 change_mode(vp, mode, p) 2263 struct vnode *vp; 2264 int mode; 2265 struct proc *p; 2266 { 2267 struct vattr vattr; 2268 int error; 2269 2270 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2271 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2272 VATTR_NULL(&vattr); 2273 vattr.va_mode = mode & ALLPERMS; 2274 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2275 VOP_UNLOCK(vp, 0); 2276 return (error); 2277 } 2278 2279 /* 2280 * Set ownership given a path name; this version follows links. 2281 */ 2282 /* ARGSUSED */ 2283 int 2284 sys_chown(p, v, retval) 2285 struct proc *p; 2286 void *v; 2287 register_t *retval; 2288 { 2289 struct sys_chown_args /* { 2290 syscallarg(const char *) path; 2291 syscallarg(uid_t) uid; 2292 syscallarg(gid_t) gid; 2293 } */ *uap = v; 2294 int error; 2295 struct nameidata nd; 2296 2297 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2298 if ((error = namei(&nd)) != 0) 2299 return (error); 2300 2301 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2302 2303 vrele(nd.ni_vp); 2304 return (error); 2305 } 2306 2307 /* 2308 * Set ownership given a path name; this version follows links. 2309 * Provides POSIX semantics. 2310 */ 2311 /* ARGSUSED */ 2312 int 2313 sys___posix_chown(p, v, retval) 2314 struct proc *p; 2315 void *v; 2316 register_t *retval; 2317 { 2318 struct sys_chown_args /* { 2319 syscallarg(const char *) path; 2320 syscallarg(uid_t) uid; 2321 syscallarg(gid_t) gid; 2322 } */ *uap = v; 2323 int error; 2324 struct nameidata nd; 2325 2326 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2327 if ((error = namei(&nd)) != 0) 2328 return (error); 2329 2330 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2331 2332 vrele(nd.ni_vp); 2333 return (error); 2334 } 2335 2336 /* 2337 * Set ownership given a file descriptor. 2338 */ 2339 /* ARGSUSED */ 2340 int 2341 sys_fchown(p, v, retval) 2342 struct proc *p; 2343 void *v; 2344 register_t *retval; 2345 { 2346 struct sys_fchown_args /* { 2347 syscallarg(int) fd; 2348 syscallarg(uid_t) uid; 2349 syscallarg(gid_t) gid; 2350 } */ *uap = v; 2351 int error; 2352 struct file *fp; 2353 2354 /* getvnode() will use the descriptor for us */ 2355 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2356 return (error); 2357 2358 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2359 SCARG(uap, gid), p, 0); 2360 FILE_UNUSE(fp, p); 2361 return (error); 2362 } 2363 2364 /* 2365 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2366 */ 2367 /* ARGSUSED */ 2368 int 2369 sys___posix_fchown(p, v, retval) 2370 struct proc *p; 2371 void *v; 2372 register_t *retval; 2373 { 2374 struct sys_fchown_args /* { 2375 syscallarg(int) fd; 2376 syscallarg(uid_t) uid; 2377 syscallarg(gid_t) gid; 2378 } */ *uap = v; 2379 int error; 2380 struct file *fp; 2381 2382 /* getvnode() will use the descriptor for us */ 2383 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2384 return (error); 2385 2386 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2387 SCARG(uap, gid), p, 1); 2388 FILE_UNUSE(fp, p); 2389 return (error); 2390 } 2391 2392 /* 2393 * Set ownership given a path name; this version does not follow links. 2394 */ 2395 /* ARGSUSED */ 2396 int 2397 sys_lchown(p, v, retval) 2398 struct proc *p; 2399 void *v; 2400 register_t *retval; 2401 { 2402 struct sys_lchown_args /* { 2403 syscallarg(const char *) path; 2404 syscallarg(uid_t) uid; 2405 syscallarg(gid_t) gid; 2406 } */ *uap = v; 2407 int error; 2408 struct nameidata nd; 2409 2410 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2411 if ((error = namei(&nd)) != 0) 2412 return (error); 2413 2414 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); 2415 2416 vrele(nd.ni_vp); 2417 return (error); 2418 } 2419 2420 /* 2421 * Set ownership given a path name; this version does not follow links. 2422 * Provides POSIX/XPG semantics. 2423 */ 2424 /* ARGSUSED */ 2425 int 2426 sys___posix_lchown(p, v, retval) 2427 struct proc *p; 2428 void *v; 2429 register_t *retval; 2430 { 2431 struct sys_lchown_args /* { 2432 syscallarg(const char *) path; 2433 syscallarg(uid_t) uid; 2434 syscallarg(gid_t) gid; 2435 } */ *uap = v; 2436 int error; 2437 struct nameidata nd; 2438 2439 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2440 if ((error = namei(&nd)) != 0) 2441 return (error); 2442 2443 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); 2444 2445 vrele(nd.ni_vp); 2446 return (error); 2447 } 2448 2449 /* 2450 * Common routine to set ownership given a vnode. 2451 */ 2452 static int 2453 change_owner(vp, uid, gid, p, posix_semantics) 2454 struct vnode *vp; 2455 uid_t uid; 2456 gid_t gid; 2457 struct proc *p; 2458 int posix_semantics; 2459 { 2460 struct vattr vattr; 2461 mode_t newmode; 2462 int error; 2463 2464 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2465 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2466 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 2467 goto out; 2468 2469 #define CHANGED(x) ((x) != -1) 2470 newmode = vattr.va_mode; 2471 if (posix_semantics) { 2472 /* 2473 * POSIX/XPG semantics: if the caller is not the super-user, 2474 * clear set-user-id and set-group-id bits. Both POSIX and 2475 * the XPG consider the behaviour for calls by the super-user 2476 * implementation-defined; we leave the set-user-id and set- 2477 * group-id settings intact in that case. 2478 */ 2479 if (suser(p->p_ucred, NULL) != 0) 2480 newmode &= ~(S_ISUID | S_ISGID); 2481 } else { 2482 /* 2483 * NetBSD semantics: when changing owner and/or group, 2484 * clear the respective bit(s). 2485 */ 2486 if (CHANGED(uid)) 2487 newmode &= ~S_ISUID; 2488 if (CHANGED(gid)) 2489 newmode &= ~S_ISGID; 2490 } 2491 /* Update va_mode iff altered. */ 2492 if (vattr.va_mode == newmode) 2493 newmode = VNOVAL; 2494 2495 VATTR_NULL(&vattr); 2496 vattr.va_uid = CHANGED(uid) ? uid : VNOVAL; 2497 vattr.va_gid = CHANGED(gid) ? gid : VNOVAL; 2498 vattr.va_mode = newmode; 2499 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2500 #undef CHANGED 2501 2502 out: 2503 VOP_UNLOCK(vp, 0); 2504 return (error); 2505 } 2506 2507 /* 2508 * Set the access and modification times given a path name; this 2509 * version follows links. 2510 */ 2511 /* ARGSUSED */ 2512 int 2513 sys_utimes(p, v, retval) 2514 struct proc *p; 2515 void *v; 2516 register_t *retval; 2517 { 2518 struct sys_utimes_args /* { 2519 syscallarg(const char *) path; 2520 syscallarg(const struct timeval *) tptr; 2521 } */ *uap = v; 2522 int error; 2523 struct nameidata nd; 2524 2525 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2526 if ((error = namei(&nd)) != 0) 2527 return (error); 2528 2529 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2530 2531 vrele(nd.ni_vp); 2532 return (error); 2533 } 2534 2535 /* 2536 * Set the access and modification times given a file descriptor. 2537 */ 2538 /* ARGSUSED */ 2539 int 2540 sys_futimes(p, v, retval) 2541 struct proc *p; 2542 void *v; 2543 register_t *retval; 2544 { 2545 struct sys_futimes_args /* { 2546 syscallarg(int) fd; 2547 syscallarg(const struct timeval *) tptr; 2548 } */ *uap = v; 2549 int error; 2550 struct file *fp; 2551 2552 /* getvnode() will use the descriptor for us */ 2553 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2554 return (error); 2555 2556 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); 2557 FILE_UNUSE(fp, p); 2558 return (error); 2559 } 2560 2561 /* 2562 * Set the access and modification times given a path name; this 2563 * version does not follow links. 2564 */ 2565 /* ARGSUSED */ 2566 int 2567 sys_lutimes(p, v, retval) 2568 struct proc *p; 2569 void *v; 2570 register_t *retval; 2571 { 2572 struct sys_lutimes_args /* { 2573 syscallarg(const char *) path; 2574 syscallarg(const struct timeval *) tptr; 2575 } */ *uap = v; 2576 int error; 2577 struct nameidata nd; 2578 2579 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2580 if ((error = namei(&nd)) != 0) 2581 return (error); 2582 2583 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); 2584 2585 vrele(nd.ni_vp); 2586 return (error); 2587 } 2588 2589 /* 2590 * Common routine to set access and modification times given a vnode. 2591 */ 2592 static int 2593 change_utimes(vp, tptr, p) 2594 struct vnode *vp; 2595 const struct timeval *tptr; 2596 struct proc *p; 2597 { 2598 struct timeval tv[2]; 2599 struct vattr vattr; 2600 int error; 2601 2602 VATTR_NULL(&vattr); 2603 if (tptr == NULL) { 2604 microtime(&tv[0]); 2605 tv[1] = tv[0]; 2606 vattr.va_vaflags |= VA_UTIMES_NULL; 2607 } else { 2608 error = copyin(tptr, tv, sizeof(tv)); 2609 if (error) 2610 return (error); 2611 } 2612 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2613 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2614 vattr.va_atime.tv_sec = tv[0].tv_sec; 2615 vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; 2616 vattr.va_mtime.tv_sec = tv[1].tv_sec; 2617 vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; 2618 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2619 VOP_UNLOCK(vp, 0); 2620 return (error); 2621 } 2622 2623 /* 2624 * Truncate a file given its path name. 2625 */ 2626 /* ARGSUSED */ 2627 int 2628 sys_truncate(p, v, retval) 2629 struct proc *p; 2630 void *v; 2631 register_t *retval; 2632 { 2633 struct sys_truncate_args /* { 2634 syscallarg(const char *) path; 2635 syscallarg(int) pad; 2636 syscallarg(off_t) length; 2637 } */ *uap = v; 2638 struct vnode *vp; 2639 struct vattr vattr; 2640 int error; 2641 struct nameidata nd; 2642 2643 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 2644 if ((error = namei(&nd)) != 0) 2645 return (error); 2646 vp = nd.ni_vp; 2647 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2648 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2649 if (vp->v_type == VDIR) 2650 error = EISDIR; 2651 else if ((error = vn_writechk(vp)) == 0 && 2652 (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { 2653 VATTR_NULL(&vattr); 2654 vattr.va_size = SCARG(uap, length); 2655 error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); 2656 } 2657 vput(vp); 2658 return (error); 2659 } 2660 2661 /* 2662 * Truncate a file given a file descriptor. 2663 */ 2664 /* ARGSUSED */ 2665 int 2666 sys_ftruncate(p, v, retval) 2667 struct proc *p; 2668 void *v; 2669 register_t *retval; 2670 { 2671 struct sys_ftruncate_args /* { 2672 syscallarg(int) fd; 2673 syscallarg(int) pad; 2674 syscallarg(off_t) length; 2675 } */ *uap = v; 2676 struct vattr vattr; 2677 struct vnode *vp; 2678 struct file *fp; 2679 int error; 2680 2681 /* getvnode() will use the descriptor for us */ 2682 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2683 return (error); 2684 if ((fp->f_flag & FWRITE) == 0) { 2685 error = EINVAL; 2686 goto out; 2687 } 2688 vp = (struct vnode *)fp->f_data; 2689 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2690 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2691 if (vp->v_type == VDIR) 2692 error = EISDIR; 2693 else if ((error = vn_writechk(vp)) == 0) { 2694 VATTR_NULL(&vattr); 2695 vattr.va_size = SCARG(uap, length); 2696 error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); 2697 } 2698 VOP_UNLOCK(vp, 0); 2699 out: 2700 FILE_UNUSE(fp, p); 2701 return (error); 2702 } 2703 2704 /* 2705 * Sync an open file. 2706 */ 2707 /* ARGSUSED */ 2708 int 2709 sys_fsync(p, v, retval) 2710 struct proc *p; 2711 void *v; 2712 register_t *retval; 2713 { 2714 struct sys_fsync_args /* { 2715 syscallarg(int) fd; 2716 } */ *uap = v; 2717 struct vnode *vp; 2718 struct file *fp; 2719 int error; 2720 2721 /* getvnode() will use the descriptor for us */ 2722 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2723 return (error); 2724 vp = (struct vnode *)fp->f_data; 2725 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2726 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, p); 2727 if (error == 0 && bioops.io_fsync != NULL && 2728 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 2729 (*bioops.io_fsync)(vp); 2730 VOP_UNLOCK(vp, 0); 2731 FILE_UNUSE(fp, p); 2732 return (error); 2733 } 2734 2735 /* 2736 * Sync the data of an open file. 2737 */ 2738 /* ARGSUSED */ 2739 int 2740 sys_fdatasync(p, v, retval) 2741 struct proc *p; 2742 void *v; 2743 register_t *retval; 2744 { 2745 struct sys_fdatasync_args /* { 2746 syscallarg(int) fd; 2747 } */ *uap = v; 2748 struct vnode *vp; 2749 struct file *fp; 2750 int error; 2751 2752 /* getvnode() will use the descriptor for us */ 2753 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2754 return (error); 2755 vp = (struct vnode *)fp->f_data; 2756 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2757 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, p); 2758 VOP_UNLOCK(vp, 0); 2759 FILE_UNUSE(fp, p); 2760 return (error); 2761 } 2762 2763 /* 2764 * Rename files, (standard) BSD semantics frontend. 2765 */ 2766 /* ARGSUSED */ 2767 int 2768 sys_rename(p, v, retval) 2769 struct proc *p; 2770 void *v; 2771 register_t *retval; 2772 { 2773 struct sys_rename_args /* { 2774 syscallarg(const char *) from; 2775 syscallarg(const char *) to; 2776 } */ *uap = v; 2777 2778 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); 2779 } 2780 2781 /* 2782 * Rename files, POSIX semantics frontend. 2783 */ 2784 /* ARGSUSED */ 2785 int 2786 sys___posix_rename(p, v, retval) 2787 struct proc *p; 2788 void *v; 2789 register_t *retval; 2790 { 2791 struct sys___posix_rename_args /* { 2792 syscallarg(const char *) from; 2793 syscallarg(const char *) to; 2794 } */ *uap = v; 2795 2796 return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); 2797 } 2798 2799 /* 2800 * Rename files. Source and destination must either both be directories, 2801 * or both not be directories. If target is a directory, it must be empty. 2802 * If `from' and `to' refer to the same object, the value of the `retain' 2803 * argument is used to determine whether `from' will be 2804 * 2805 * (retain == 0) deleted unless `from' and `to' refer to the same 2806 * object in the file system's name space (BSD). 2807 * (retain == 1) always retained (POSIX). 2808 */ 2809 static int 2810 rename_files(from, to, p, retain) 2811 const char *from, *to; 2812 struct proc *p; 2813 int retain; 2814 { 2815 struct vnode *tvp, *fvp, *tdvp; 2816 struct nameidata fromnd, tond; 2817 int error; 2818 2819 NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, 2820 from, p); 2821 if ((error = namei(&fromnd)) != 0) 2822 return (error); 2823 fvp = fromnd.ni_vp; 2824 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART, 2825 UIO_USERSPACE, to, p); 2826 if ((error = namei(&tond)) != 0) { 2827 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2828 vrele(fromnd.ni_dvp); 2829 vrele(fvp); 2830 goto out1; 2831 } 2832 tdvp = tond.ni_dvp; 2833 tvp = tond.ni_vp; 2834 2835 if (tvp != NULL) { 2836 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 2837 error = ENOTDIR; 2838 goto out; 2839 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 2840 error = EISDIR; 2841 goto out; 2842 } 2843 } 2844 2845 if (fvp == tdvp) 2846 error = EINVAL; 2847 2848 /* 2849 * Source and destination refer to the same object. 2850 */ 2851 if (fvp == tvp) { 2852 if (retain) 2853 error = -1; 2854 else if (fromnd.ni_dvp == tdvp && 2855 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 2856 !memcmp(fromnd.ni_cnd.cn_nameptr, 2857 tond.ni_cnd.cn_nameptr, 2858 fromnd.ni_cnd.cn_namelen)) 2859 error = -1; 2860 } 2861 2862 out: 2863 if (!error) { 2864 VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); 2865 if (fromnd.ni_dvp != tdvp) 2866 VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2867 if (tvp) { 2868 (void)uvm_vnp_uncache(tvp); 2869 VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); 2870 } 2871 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 2872 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 2873 } else { 2874 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 2875 if (tdvp == tvp) 2876 vrele(tdvp); 2877 else 2878 vput(tdvp); 2879 if (tvp) 2880 vput(tvp); 2881 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 2882 vrele(fromnd.ni_dvp); 2883 vrele(fvp); 2884 } 2885 vrele(tond.ni_startdir); 2886 FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI); 2887 out1: 2888 if (fromnd.ni_startdir) 2889 vrele(fromnd.ni_startdir); 2890 FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI); 2891 return (error == -1 ? 0 : error); 2892 } 2893 2894 /* 2895 * Make a directory file. 2896 */ 2897 /* ARGSUSED */ 2898 int 2899 sys_mkdir(p, v, retval) 2900 struct proc *p; 2901 void *v; 2902 register_t *retval; 2903 { 2904 struct sys_mkdir_args /* { 2905 syscallarg(const char *) path; 2906 syscallarg(int) mode; 2907 } */ *uap = v; 2908 struct vnode *vp; 2909 struct vattr vattr; 2910 int error; 2911 struct nameidata nd; 2912 2913 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 2914 if ((error = namei(&nd)) != 0) 2915 return (error); 2916 vp = nd.ni_vp; 2917 if (vp != NULL) { 2918 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2919 if (nd.ni_dvp == vp) 2920 vrele(nd.ni_dvp); 2921 else 2922 vput(nd.ni_dvp); 2923 vrele(vp); 2924 return (EEXIST); 2925 } 2926 VATTR_NULL(&vattr); 2927 vattr.va_type = VDIR; 2928 vattr.va_mode = 2929 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 2930 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2931 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 2932 if (!error) 2933 vput(nd.ni_vp); 2934 return (error); 2935 } 2936 2937 /* 2938 * Remove a directory file. 2939 */ 2940 /* ARGSUSED */ 2941 int 2942 sys_rmdir(p, v, retval) 2943 struct proc *p; 2944 void *v; 2945 register_t *retval; 2946 { 2947 struct sys_rmdir_args /* { 2948 syscallarg(const char *) path; 2949 } */ *uap = v; 2950 struct vnode *vp; 2951 int error; 2952 struct nameidata nd; 2953 2954 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2955 SCARG(uap, path), p); 2956 if ((error = namei(&nd)) != 0) 2957 return (error); 2958 vp = nd.ni_vp; 2959 if (vp->v_type != VDIR) { 2960 error = ENOTDIR; 2961 goto out; 2962 } 2963 /* 2964 * No rmdir "." please. 2965 */ 2966 if (nd.ni_dvp == vp) { 2967 error = EINVAL; 2968 goto out; 2969 } 2970 /* 2971 * The root of a mounted filesystem cannot be deleted. 2972 */ 2973 if (vp->v_flag & VROOT) 2974 error = EBUSY; 2975 out: 2976 if (!error) { 2977 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); 2978 VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); 2979 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2980 } else { 2981 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2982 if (nd.ni_dvp == vp) 2983 vrele(nd.ni_dvp); 2984 else 2985 vput(nd.ni_dvp); 2986 vput(vp); 2987 } 2988 return (error); 2989 } 2990 2991 /* 2992 * Read a block of directory entries in a file system independent format. 2993 */ 2994 int 2995 sys_getdents(p, v, retval) 2996 struct proc *p; 2997 void *v; 2998 register_t *retval; 2999 { 3000 struct sys_getdents_args /* { 3001 syscallarg(int) fd; 3002 syscallarg(char *) buf; 3003 syscallarg(size_t) count; 3004 } */ *uap = v; 3005 struct file *fp; 3006 int error, done; 3007 3008 /* getvnode() will use the descriptor for us */ 3009 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3010 return (error); 3011 if ((fp->f_flag & FREAD) == 0) { 3012 error = EBADF; 3013 goto out; 3014 } 3015 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 3016 SCARG(uap, count), &done, p, 0, 0); 3017 *retval = done; 3018 out: 3019 FILE_UNUSE(fp, p); 3020 return (error); 3021 } 3022 3023 /* 3024 * Set the mode mask for creation of filesystem nodes. 3025 */ 3026 int 3027 sys_umask(p, v, retval) 3028 struct proc *p; 3029 void *v; 3030 register_t *retval; 3031 { 3032 struct sys_umask_args /* { 3033 syscallarg(mode_t) newmask; 3034 } */ *uap = v; 3035 struct cwdinfo *cwdi; 3036 3037 cwdi = p->p_cwdi; 3038 *retval = cwdi->cwdi_cmask; 3039 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 3040 return (0); 3041 } 3042 3043 /* 3044 * Void all references to file by ripping underlying filesystem 3045 * away from vnode. 3046 */ 3047 /* ARGSUSED */ 3048 int 3049 sys_revoke(p, v, retval) 3050 struct proc *p; 3051 void *v; 3052 register_t *retval; 3053 { 3054 struct sys_revoke_args /* { 3055 syscallarg(const char *) path; 3056 } */ *uap = v; 3057 struct vnode *vp; 3058 struct vattr vattr; 3059 int error; 3060 struct nameidata nd; 3061 3062 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 3063 if ((error = namei(&nd)) != 0) 3064 return (error); 3065 vp = nd.ni_vp; 3066 if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) 3067 goto out; 3068 if (p->p_ucred->cr_uid != vattr.va_uid && 3069 (error = suser(p->p_ucred, &p->p_acflag)) != 0) 3070 goto out; 3071 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3072 VOP_REVOKE(vp, REVOKEALL); 3073 out: 3074 vrele(vp); 3075 return (error); 3076 } 3077 3078 /* 3079 * Convert a user file descriptor to a kernel file entry. 3080 */ 3081 int 3082 getvnode(fdp, fd, fpp) 3083 struct filedesc *fdp; 3084 int fd; 3085 struct file **fpp; 3086 { 3087 struct vnode *vp; 3088 struct file *fp; 3089 3090 if ((u_int)fd >= fdp->fd_nfiles || 3091 (fp = fdp->fd_ofiles[fd]) == NULL || 3092 (fp->f_iflags & FIF_WANTCLOSE) != 0) 3093 return (EBADF); 3094 3095 FILE_USE(fp); 3096 3097 if (fp->f_type != DTYPE_VNODE) { 3098 FILE_UNUSE(fp, NULL); 3099 return (EINVAL); 3100 } 3101 3102 vp = (struct vnode *)fp->f_data; 3103 if (vp->v_type == VBAD) { 3104 FILE_UNUSE(fp, NULL); 3105 return (EBADF); 3106 } 3107 3108 *fpp = fp; 3109 return (0); 3110 } 3111
Indexes created Mon Sep 22 13:09:51 GMT 2025