1 /* $NetBSD: vfs_syscalls_43.c,v 1.21 2002/11/25 02:32:51 thorpej 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 8.28 (Berkeley) 12/10/94 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls_43.c,v 1.21 2002/11/25 02:32:51 thorpej Exp $"); 45 46 #if defined(_KERNEL_OPT) 47 #include "fs_union.h" 48 #endif 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/filedesc.h> 53 #include <sys/kernel.h> 54 #include <sys/proc.h> 55 #include <sys/file.h> 56 #include <sys/vnode.h> 57 #include <sys/namei.h> 58 #include <sys/dirent.h> 59 #include <sys/socket.h> 60 #include <sys/socketvar.h> 61 #include <sys/stat.h> 62 #include <sys/ioctl.h> 63 #include <sys/fcntl.h> 64 #include <sys/malloc.h> 65 #include <sys/syslog.h> 66 #include <sys/unistd.h> 67 #include <sys/resourcevar.h> 68 69 #include <sys/mount.h> 70 #include <sys/syscallargs.h> 71 72 static void cvtstat __P((struct stat *, struct stat43 *)); 73 74 /* 75 * Convert from an old to a new stat structure. 76 */ 77 static void 78 cvtstat(st, ost) 79 struct stat *st; 80 struct stat43 *ost; 81 { 82 83 ost->st_dev = st->st_dev; 84 ost->st_ino = st->st_ino; 85 ost->st_mode = st->st_mode & 0xffff; 86 ost->st_nlink = st->st_nlink; 87 ost->st_uid = st->st_uid; 88 ost->st_gid = st->st_gid; 89 ost->st_rdev = st->st_rdev; 90 if (st->st_size < (quad_t)1 << 32) 91 ost->st_size = st->st_size; 92 else 93 ost->st_size = -2; 94 ost->st_atime = st->st_atime; 95 ost->st_mtime = st->st_mtime; 96 ost->st_ctime = st->st_ctime; 97 ost->st_blksize = st->st_blksize; 98 ost->st_blocks = st->st_blocks; 99 ost->st_flags = st->st_flags; 100 ost->st_gen = st->st_gen; 101 } 102 103 /* 104 * Get file status; this version follows links. 105 */ 106 /* ARGSUSED */ 107 int 108 compat_43_sys_stat(p, v, retval) 109 struct proc *p; 110 void *v; 111 register_t *retval; 112 { 113 struct compat_43_sys_stat_args /* { 114 syscallarg(char *) path; 115 syscallarg(struct stat43 *) ub; 116 } */ *uap = v; 117 struct stat sb; 118 struct stat43 osb; 119 int error; 120 struct nameidata nd; 121 122 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 123 SCARG(uap, path), p); 124 if ((error = namei(&nd)) != 0) 125 return (error); 126 error = vn_stat(nd.ni_vp, &sb, p); 127 vput(nd.ni_vp); 128 if (error) 129 return (error); 130 cvtstat(&sb, &osb); 131 error = copyout((caddr_t)&osb, (caddr_t)SCARG(uap, ub), sizeof (osb)); 132 return (error); 133 } 134 135 /* 136 * Get file status; this version does not follow links. 137 */ 138 /* ARGSUSED */ 139 int 140 compat_43_sys_lstat(p, v, retval) 141 struct proc *p; 142 void *v; 143 register_t *retval; 144 { 145 struct compat_43_sys_lstat_args /* { 146 syscallarg(char *) path; 147 syscallarg(struct ostat *) ub; 148 } */ *uap = v; 149 struct vnode *vp, *dvp; 150 struct stat sb, sb1; 151 struct stat43 osb; 152 int error; 153 struct nameidata nd; 154 int ndflags; 155 156 ndflags = NOFOLLOW | LOCKLEAF | LOCKPARENT; 157 again: 158 NDINIT(&nd, LOOKUP, ndflags, UIO_USERSPACE, SCARG(uap, path), p); 159 if ((error = namei(&nd))) { 160 if (error == EISDIR && (ndflags & LOCKPARENT) != 0) { 161 /* 162 * Should only happen on '/'. Retry without LOCKPARENT; 163 * this is safe since the vnode won't be a VLNK. 164 */ 165 ndflags &= ~LOCKPARENT; 166 goto again; 167 } 168 return (error); 169 } 170 /* 171 * For symbolic links, always return the attributes of its 172 * containing directory, except for mode, size, and links. 173 */ 174 vp = nd.ni_vp; 175 dvp = nd.ni_dvp; 176 if (vp->v_type != VLNK) { 177 if ((ndflags & LOCKPARENT) != 0) { 178 if (dvp == vp) 179 vrele(dvp); 180 else 181 vput(dvp); 182 } 183 error = vn_stat(vp, &sb, p); 184 vput(vp); 185 if (error) 186 return (error); 187 } else { 188 error = vn_stat(dvp, &sb, p); 189 vput(dvp); 190 if (error) { 191 vput(vp); 192 return (error); 193 } 194 error = vn_stat(vp, &sb1, p); 195 vput(vp); 196 if (error) 197 return (error); 198 sb.st_mode &= ~S_IFDIR; 199 sb.st_mode |= S_IFLNK; 200 sb.st_nlink = sb1.st_nlink; 201 sb.st_size = sb1.st_size; 202 sb.st_blocks = sb1.st_blocks; 203 } 204 cvtstat(&sb, &osb); 205 error = copyout((caddr_t)&osb, (caddr_t)SCARG(uap, ub), sizeof (osb)); 206 return (error); 207 } 208 209 /* 210 * Return status information about a file descriptor. 211 */ 212 /* ARGSUSED */ 213 int 214 compat_43_sys_fstat(p, v, retval) 215 struct proc *p; 216 void *v; 217 register_t *retval; 218 { 219 struct compat_43_sys_fstat_args /* { 220 syscallarg(int) fd; 221 syscallarg(struct stat43 *) sb; 222 } */ *uap = v; 223 int fd = SCARG(uap, fd); 224 struct filedesc *fdp = p->p_fd; 225 struct file *fp; 226 struct stat ub; 227 struct stat43 oub; 228 int error; 229 230 if ((fp = fd_getfile(fdp, fd)) == NULL) 231 return (EBADF); 232 233 FILE_USE(fp); 234 error = (*fp->f_ops->fo_stat)(fp, &ub, p); 235 FILE_UNUSE(fp, p); 236 237 if (error == 0) { 238 cvtstat(&ub, &oub); 239 error = copyout((caddr_t)&oub, (caddr_t)SCARG(uap, sb), 240 sizeof (oub)); 241 } 242 243 244 return (error); 245 } 246 247 248 /* 249 * Truncate a file given a file descriptor. 250 */ 251 /* ARGSUSED */ 252 int 253 compat_43_sys_ftruncate(p, v, retval) 254 struct proc *p; 255 void *v; 256 register_t *retval; 257 { 258 struct compat_43_sys_ftruncate_args /* { 259 syscallarg(int) fd; 260 syscallarg(long) length; 261 } */ *uap = v; 262 struct sys_ftruncate_args /* { 263 syscallarg(int) fd; 264 syscallarg(int) pad; 265 syscallarg(off_t) length; 266 } */ nuap; 267 268 SCARG(&nuap, fd) = SCARG(uap, fd); 269 SCARG(&nuap, length) = SCARG(uap, length); 270 return (sys_ftruncate(p, &nuap, retval)); 271 } 272 273 /* 274 * Truncate a file given its path name. 275 */ 276 /* ARGSUSED */ 277 int 278 compat_43_sys_truncate(p, v, retval) 279 struct proc *p; 280 void *v; 281 register_t *retval; 282 { 283 struct compat_43_sys_truncate_args /* { 284 syscallarg(char *) path; 285 syscallarg(long) length; 286 } */ *uap = v; 287 struct sys_truncate_args /* { 288 syscallarg(char *) path; 289 syscallarg(int) pad; 290 syscallarg(off_t) length; 291 } */ nuap; 292 293 SCARG(&nuap, path) = SCARG(uap, path); 294 SCARG(&nuap, length) = SCARG(uap, length); 295 return (sys_truncate(p, &nuap, retval)); 296 } 297 298 299 /* 300 * Reposition read/write file offset. 301 */ 302 int 303 compat_43_sys_lseek(p, v, retval) 304 struct proc *p; 305 void *v; 306 register_t *retval; 307 { 308 struct compat_43_sys_lseek_args /* { 309 syscallarg(int) fd; 310 syscallarg(long) offset; 311 syscallarg(int) whence; 312 } */ *uap = v; 313 struct sys_lseek_args /* { 314 syscallarg(int) fd; 315 syscallarg(int) pad; 316 syscallarg(off_t) offset; 317 syscallarg(int) whence; 318 } */ nuap; 319 off_t qret; 320 int error; 321 322 SCARG(&nuap, fd) = SCARG(uap, fd); 323 SCARG(&nuap, offset) = SCARG(uap, offset); 324 SCARG(&nuap, whence) = SCARG(uap, whence); 325 error = sys_lseek(p, &nuap, (void *)&qret); 326 *(long *)retval = qret; 327 return (error); 328 } 329 330 331 /* 332 * Create a file. 333 */ 334 int 335 compat_43_sys_creat(p, v, retval) 336 struct proc *p; 337 void *v; 338 register_t *retval; 339 { 340 struct compat_43_sys_creat_args /* { 341 syscallarg(char *) path; 342 syscallarg(int) mode; 343 } */ *uap = v; 344 struct sys_open_args /* { 345 syscallarg(char *) path; 346 syscallarg(int) flags; 347 syscallarg(int) mode; 348 } */ nuap; 349 350 SCARG(&nuap, path) = SCARG(uap, path); 351 SCARG(&nuap, mode) = SCARG(uap, mode); 352 SCARG(&nuap, flags) = O_WRONLY | O_CREAT | O_TRUNC; 353 return (sys_open(p, &nuap, retval)); 354 } 355 356 /*ARGSUSED*/ 357 int 358 compat_43_sys_quota(p, v, retval) 359 struct proc *p; 360 void *v; 361 register_t *retval; 362 { 363 364 return (ENOSYS); 365 } 366 367 368 /* 369 * Read a block of directory entries in a file system independent format. 370 */ 371 int 372 compat_43_sys_getdirentries(p, v, retval) 373 struct proc *p; 374 void *v; 375 register_t *retval; 376 { 377 struct compat_43_sys_getdirentries_args /* { 378 syscallarg(int) fd; 379 syscallarg(char *) buf; 380 syscallarg(u_int) count; 381 syscallarg(long *) basep; 382 } */ *uap = v; 383 struct vnode *vp; 384 struct file *fp; 385 struct uio auio, kuio; 386 struct iovec aiov, kiov; 387 struct dirent *dp, *edp; 388 caddr_t dirbuf; 389 int error, eofflag, readcnt; 390 long loff; 391 392 /* getvnode() will use the descriptor for us */ 393 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 394 return (error); 395 if ((fp->f_flag & FREAD) == 0) { 396 error = EBADF; 397 goto out; 398 } 399 vp = (struct vnode *)fp->f_data; 400 unionread: 401 if (vp->v_type != VDIR) { 402 error = EINVAL; 403 goto out; 404 } 405 aiov.iov_base = SCARG(uap, buf); 406 aiov.iov_len = SCARG(uap, count); 407 auio.uio_iov = &aiov; 408 auio.uio_iovcnt = 1; 409 auio.uio_rw = UIO_READ; 410 auio.uio_segflg = UIO_USERSPACE; 411 auio.uio_procp = p; 412 auio.uio_resid = SCARG(uap, count); 413 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 414 loff = auio.uio_offset = fp->f_offset; 415 # if (BYTE_ORDER != LITTLE_ENDIAN) 416 if (vp->v_mount->mnt_maxsymlinklen <= 0) { 417 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, 418 (off_t **)0, (int *)0); 419 fp->f_offset = auio.uio_offset; 420 } else 421 # endif 422 { 423 kuio = auio; 424 kuio.uio_iov = &kiov; 425 kuio.uio_segflg = UIO_SYSSPACE; 426 kiov.iov_len = SCARG(uap, count); 427 MALLOC(dirbuf, caddr_t, SCARG(uap, count), M_TEMP, M_WAITOK); 428 kiov.iov_base = dirbuf; 429 error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag, 430 (off_t **)0, (int *)0); 431 fp->f_offset = kuio.uio_offset; 432 if (error == 0) { 433 readcnt = SCARG(uap, count) - kuio.uio_resid; 434 edp = (struct dirent *)&dirbuf[readcnt]; 435 for (dp = (struct dirent *)dirbuf; dp < edp; ) { 436 # if (BYTE_ORDER == LITTLE_ENDIAN) 437 /* 438 * The expected low byte of 439 * dp->d_namlen is our dp->d_type. 440 * The high MBZ byte of dp->d_namlen 441 * is our dp->d_namlen. 442 */ 443 dp->d_type = dp->d_namlen; 444 dp->d_namlen = 0; 445 # else 446 /* 447 * The dp->d_type is the high byte 448 * of the expected dp->d_namlen, 449 * so must be zero'ed. 450 */ 451 dp->d_type = 0; 452 # endif 453 if (dp->d_reclen > 0) { 454 dp = (struct dirent *) 455 ((char *)dp + dp->d_reclen); 456 } else { 457 error = EIO; 458 break; 459 } 460 } 461 if (dp >= edp) 462 error = uiomove(dirbuf, readcnt, &auio); 463 } 464 FREE(dirbuf, M_TEMP); 465 } 466 VOP_UNLOCK(vp, 0); 467 if (error) 468 goto out; 469 470 #ifdef UNION 471 { 472 extern int (**union_vnodeop_p) __P((void *)); 473 extern struct vnode *union_dircache __P((struct vnode *)); 474 475 if ((SCARG(uap, count) == auio.uio_resid) && 476 (vp->v_op == union_vnodeop_p)) { 477 struct vnode *lvp; 478 479 lvp = union_dircache(vp); 480 if (lvp != NULLVP) { 481 struct vattr va; 482 483 /* 484 * If the directory is opaque, 485 * then don't show lower entries 486 */ 487 error = VOP_GETATTR(vp, &va, fp->f_cred, p); 488 if (va.va_flags & OPAQUE) { 489 vput(lvp); 490 lvp = NULL; 491 } 492 } 493 494 if (lvp != NULLVP) { 495 error = VOP_OPEN(lvp, FREAD, fp->f_cred, p); 496 VOP_UNLOCK(lvp, 0); 497 498 if (error) { 499 vrele(lvp); 500 goto out; 501 } 502 fp->f_data = (caddr_t) lvp; 503 fp->f_offset = 0; 504 error = vn_close(vp, FREAD, fp->f_cred, p); 505 if (error) 506 goto out; 507 vp = lvp; 508 goto unionread; 509 } 510 } 511 } 512 #endif /* UNION */ 513 514 if ((SCARG(uap, count) == auio.uio_resid) && 515 (vp->v_flag & VROOT) && 516 (vp->v_mount->mnt_flag & MNT_UNION)) { 517 struct vnode *tvp = vp; 518 vp = vp->v_mount->mnt_vnodecovered; 519 VREF(vp); 520 fp->f_data = (caddr_t) vp; 521 fp->f_offset = 0; 522 vrele(tvp); 523 goto unionread; 524 } 525 error = copyout((caddr_t)&loff, (caddr_t)SCARG(uap, basep), 526 sizeof(long)); 527 *retval = SCARG(uap, count) - auio.uio_resid; 528 out: 529 FILE_UNUSE(fp, p); 530 return (error); 531 } 532