vfs_syscalls_43.c revision 1.14
1 /* $NetBSD: vfs_syscalls_43.c,v 1.14 2000/07/26 11:43:07 pk 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 "fs_union.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/filedesc.h> 48 #include <sys/kernel.h> 49 #include <sys/proc.h> 50 #include <sys/file.h> 51 #include <sys/vnode.h> 52 #include <sys/namei.h> 53 #include <sys/dirent.h> 54 #include <sys/socket.h> 55 #include <sys/socketvar.h> 56 #include <sys/stat.h> 57 #include <sys/ioctl.h> 58 #include <sys/fcntl.h> 59 #include <sys/malloc.h> 60 #include <sys/syslog.h> 61 #include <sys/unistd.h> 62 #include <sys/resourcevar.h> 63 64 #include <sys/mount.h> 65 #include <sys/syscallargs.h> 66 67 static void cvtstat __P((struct stat *, struct stat43 *)); 68 69 /* 70 * Convert from an old to a new stat structure. 71 */ 72 static void 73 cvtstat(st, ost) 74 struct stat *st; 75 struct stat43 *ost; 76 { 77 78 ost->st_dev = st->st_dev; 79 ost->st_ino = st->st_ino; 80 ost->st_mode = st->st_mode & 0xffff; 81 ost->st_nlink = st->st_nlink; 82 ost->st_uid = st->st_uid; 83 ost->st_gid = st->st_gid; 84 ost->st_rdev = st->st_rdev; 85 if (st->st_size < (quad_t)1 << 32) 86 ost->st_size = st->st_size; 87 else 88 ost->st_size = -2; 89 ost->st_atime = st->st_atime; 90 ost->st_mtime = st->st_mtime; 91 ost->st_ctime = st->st_ctime; 92 ost->st_blksize = st->st_blksize; 93 ost->st_blocks = st->st_blocks; 94 ost->st_flags = st->st_flags; 95 ost->st_gen = st->st_gen; 96 } 97 98 /* 99 * Get file status; this version follows links. 100 */ 101 /* ARGSUSED */ 102 int 103 compat_43_sys_stat(p, v, retval) 104 struct proc *p; 105 void *v; 106 register_t *retval; 107 { 108 struct compat_43_sys_stat_args /* { 109 syscallarg(char *) path; 110 syscallarg(struct stat43 *) ub; 111 } */ *uap = v; 112 struct stat sb; 113 struct stat43 osb; 114 int error; 115 struct nameidata nd; 116 117 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 118 SCARG(uap, path), p); 119 if ((error = namei(&nd)) != 0) 120 return (error); 121 error = vn_stat(nd.ni_vp, &sb, p); 122 vput(nd.ni_vp); 123 if (error) 124 return (error); 125 cvtstat(&sb, &osb); 126 error = copyout((caddr_t)&osb, (caddr_t)SCARG(uap, ub), sizeof (osb)); 127 return (error); 128 } 129 130 /* 131 * Get file status; this version does not follow links. 132 */ 133 /* ARGSUSED */ 134 int 135 compat_43_sys_lstat(p, v, retval) 136 struct proc *p; 137 void *v; 138 register_t *retval; 139 { 140 struct compat_43_sys_lstat_args /* { 141 syscallarg(char *) path; 142 syscallarg(struct ostat *) ub; 143 } */ *uap = v; 144 struct vnode *vp, *dvp; 145 struct stat sb, sb1; 146 struct stat43 osb; 147 int error; 148 struct nameidata nd; 149 int ndflags; 150 151 ndflags = NOFOLLOW | LOCKLEAF | LOCKPARENT; 152 again: 153 NDINIT(&nd, LOOKUP, ndflags, UIO_USERSPACE, SCARG(uap, path), p); 154 if ((error = namei(&nd))) { 155 if (error == EISDIR && (ndflags & LOCKPARENT) != 0) { 156 /* 157 * Should only happen on '/'. Retry without LOCKPARENT; 158 * this is safe since the vnode won't be a VLNK. 159 */ 160 ndflags &= ~LOCKPARENT; 161 goto again; 162 } 163 return (error); 164 } 165 /* 166 * For symbolic links, always return the attributes of its 167 * containing directory, except for mode, size, and links. 168 */ 169 vp = nd.ni_vp; 170 dvp = nd.ni_dvp; 171 if (vp->v_type != VLNK) { 172 if ((ndflags & LOCKPARENT) != 0) { 173 if (dvp == vp) 174 vrele(dvp); 175 else 176 vput(dvp); 177 } 178 error = vn_stat(vp, &sb, p); 179 vput(vp); 180 if (error) 181 return (error); 182 } else { 183 error = vn_stat(dvp, &sb, p); 184 vput(dvp); 185 if (error) { 186 vput(vp); 187 return (error); 188 } 189 error = vn_stat(vp, &sb1, p); 190 vput(vp); 191 if (error) 192 return (error); 193 sb.st_mode &= ~S_IFDIR; 194 sb.st_mode |= S_IFLNK; 195 sb.st_nlink = sb1.st_nlink; 196 sb.st_size = sb1.st_size; 197 sb.st_blocks = sb1.st_blocks; 198 } 199 cvtstat(&sb, &osb); 200 error = copyout((caddr_t)&osb, (caddr_t)SCARG(uap, ub), sizeof (osb)); 201 return (error); 202 } 203 204 /* 205 * Return status information about a file descriptor. 206 */ 207 /* ARGSUSED */ 208 int 209 compat_43_sys_fstat(p, v, retval) 210 struct proc *p; 211 void *v; 212 register_t *retval; 213 { 214 struct compat_43_sys_fstat_args /* { 215 syscallarg(int) fd; 216 syscallarg(struct stat43 *) sb; 217 } */ *uap = v; 218 int fd = SCARG(uap, fd); 219 struct filedesc *fdp = p->p_fd; 220 struct file *fp; 221 struct stat ub; 222 struct stat43 oub; 223 int error; 224 225 if ((u_int)fd >= fdp->fd_nfiles || 226 (fp = fdp->fd_ofiles[fd]) == NULL) 227 return (EBADF); 228 switch (fp->f_type) { 229 230 case DTYPE_VNODE: 231 error = vn_stat((struct vnode *)fp->f_data, &ub, p); 232 break; 233 234 case DTYPE_SOCKET: 235 error = soo_stat((struct socket *)fp->f_data, &ub); 236 break; 237 238 default: 239 panic("ofstat"); 240 /*NOTREACHED*/ 241 } 242 cvtstat(&ub, &oub); 243 if (error == 0) 244 error = copyout((caddr_t)&oub, (caddr_t)SCARG(uap, sb), 245 sizeof (oub)); 246 return (error); 247 } 248 249 250 /* 251 * Truncate a file given a file descriptor. 252 */ 253 /* ARGSUSED */ 254 int 255 compat_43_sys_ftruncate(p, v, retval) 256 struct proc *p; 257 void *v; 258 register_t *retval; 259 { 260 struct compat_43_sys_ftruncate_args /* { 261 syscallarg(int) fd; 262 syscallarg(long) length; 263 } */ *uap = v; 264 struct sys_ftruncate_args /* { 265 syscallarg(int) fd; 266 syscallarg(int) pad; 267 syscallarg(off_t) length; 268 } */ nuap; 269 270 SCARG(&nuap, fd) = SCARG(uap, fd); 271 SCARG(&nuap, length) = SCARG(uap, length); 272 return (sys_ftruncate(p, &nuap, retval)); 273 } 274 275 /* 276 * Truncate a file given its path name. 277 */ 278 /* ARGSUSED */ 279 int 280 compat_43_sys_truncate(p, v, retval) 281 struct proc *p; 282 void *v; 283 register_t *retval; 284 { 285 struct compat_43_sys_truncate_args /* { 286 syscallarg(char *) path; 287 syscallarg(long) length; 288 } */ *uap = v; 289 struct sys_truncate_args /* { 290 syscallarg(char *) path; 291 syscallarg(int) pad; 292 syscallarg(off_t) length; 293 } */ nuap; 294 295 SCARG(&nuap, path) = SCARG(uap, path); 296 SCARG(&nuap, length) = SCARG(uap, length); 297 return (sys_truncate(p, &nuap, retval)); 298 } 299 300 301 /* 302 * Reposition read/write file offset. 303 */ 304 int 305 compat_43_sys_lseek(p, v, retval) 306 struct proc *p; 307 void *v; 308 register_t *retval; 309 { 310 struct compat_43_sys_lseek_args /* { 311 syscallarg(int) fd; 312 syscallarg(long) offset; 313 syscallarg(int) whence; 314 } */ *uap = v; 315 struct sys_lseek_args /* { 316 syscallarg(int) fd; 317 syscallarg(int) pad; 318 syscallarg(off_t) offset; 319 syscallarg(int) whence; 320 } */ nuap; 321 off_t qret; 322 int error; 323 324 SCARG(&nuap, fd) = SCARG(uap, fd); 325 SCARG(&nuap, offset) = SCARG(uap, offset); 326 SCARG(&nuap, whence) = SCARG(uap, whence); 327 error = sys_lseek(p, &nuap, (register_t *)&qret); 328 *(long *)retval = qret; 329 return (error); 330 } 331 332 333 /* 334 * Create a file. 335 */ 336 int 337 compat_43_sys_creat(p, v, retval) 338 struct proc *p; 339 void *v; 340 register_t *retval; 341 { 342 struct compat_43_sys_creat_args /* { 343 syscallarg(char *) path; 344 syscallarg(int) mode; 345 } */ *uap = v; 346 struct sys_open_args /* { 347 syscallarg(char *) path; 348 syscallarg(int) flags; 349 syscallarg(int) mode; 350 } */ nuap; 351 352 SCARG(&nuap, path) = SCARG(uap, path); 353 SCARG(&nuap, mode) = SCARG(uap, mode); 354 SCARG(&nuap, flags) = O_WRONLY | O_CREAT | O_TRUNC; 355 return (sys_open(p, &nuap, retval)); 356 } 357 358 /*ARGSUSED*/ 359 int 360 compat_43_sys_quota(p, v, retval) 361 struct proc *p; 362 void *v; 363 register_t *retval; 364 { 365 366 return (ENOSYS); 367 } 368 369 370 /* 371 * Read a block of directory entries in a file system independent format. 372 */ 373 int 374 compat_43_sys_getdirentries(p, v, retval) 375 struct proc *p; 376 void *v; 377 register_t *retval; 378 { 379 struct compat_43_sys_getdirentries_args /* { 380 syscallarg(int) fd; 381 syscallarg(char *) buf; 382 syscallarg(u_int) count; 383 syscallarg(long *) basep; 384 } */ *uap = v; 385 struct vnode *vp; 386 struct file *fp; 387 struct uio auio, kuio; 388 struct iovec aiov, kiov; 389 struct dirent *dp, *edp; 390 caddr_t dirbuf; 391 int error, eofflag, readcnt; 392 long loff; 393 394 /* getvnode() will use the descriptor for us */ 395 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 396 return (error); 397 if ((fp->f_flag & FREAD) == 0) { 398 error = EBADF; 399 goto out; 400 } 401 vp = (struct vnode *)fp->f_data; 402 unionread: 403 if (vp->v_type != VDIR) { 404 error = EINVAL; 405 goto out; 406 } 407 aiov.iov_base = SCARG(uap, buf); 408 aiov.iov_len = SCARG(uap, count); 409 auio.uio_iov = &aiov; 410 auio.uio_iovcnt = 1; 411 auio.uio_rw = UIO_READ; 412 auio.uio_segflg = UIO_USERSPACE; 413 auio.uio_procp = p; 414 auio.uio_resid = SCARG(uap, count); 415 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 416 loff = auio.uio_offset = fp->f_offset; 417 # if (BYTE_ORDER != LITTLE_ENDIAN) 418 if (vp->v_mount->mnt_maxsymlinklen <= 0) { 419 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, 420 (off_t **)0, (int *)0); 421 fp->f_offset = auio.uio_offset; 422 } else 423 # endif 424 { 425 kuio = auio; 426 kuio.uio_iov = &kiov; 427 kuio.uio_segflg = UIO_SYSSPACE; 428 kiov.iov_len = SCARG(uap, count); 429 MALLOC(dirbuf, caddr_t, SCARG(uap, count), M_TEMP, M_WAITOK); 430 kiov.iov_base = dirbuf; 431 error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag, 432 (off_t **)0, (int *)0); 433 fp->f_offset = kuio.uio_offset; 434 if (error == 0) { 435 readcnt = SCARG(uap, count) - kuio.uio_resid; 436 edp = (struct dirent *)&dirbuf[readcnt]; 437 for (dp = (struct dirent *)dirbuf; dp < edp; ) { 438 # if (BYTE_ORDER == LITTLE_ENDIAN) 439 /* 440 * The expected low byte of 441 * dp->d_namlen is our dp->d_type. 442 * The high MBZ byte of dp->d_namlen 443 * is our dp->d_namlen. 444 */ 445 dp->d_type = dp->d_namlen; 446 dp->d_namlen = 0; 447 # else 448 /* 449 * The dp->d_type is the high byte 450 * of the expected dp->d_namlen, 451 * so must be zero'ed. 452 */ 453 dp->d_type = 0; 454 # endif 455 if (dp->d_reclen > 0) { 456 dp = (struct dirent *) 457 ((char *)dp + dp->d_reclen); 458 } else { 459 error = EIO; 460 break; 461 } 462 } 463 if (dp >= edp) 464 error = uiomove(dirbuf, readcnt, &auio); 465 } 466 FREE(dirbuf, M_TEMP); 467 } 468 VOP_UNLOCK(vp, 0); 469 if (error) 470 goto out; 471 472 #ifdef UNION 473 { 474 extern int (**union_vnodeop_p) __P((void *)); 475 extern struct vnode *union_dircache __P((struct vnode *)); 476 477 if ((SCARG(uap, count) == auio.uio_resid) && 478 (vp->v_op == union_vnodeop_p)) { 479 struct vnode *lvp; 480 481 lvp = union_dircache(vp); 482 if (lvp != NULLVP) { 483 struct vattr va; 484 485 /* 486 * If the directory is opaque, 487 * then don't show lower entries 488 */ 489 error = VOP_GETATTR(vp, &va, fp->f_cred, p); 490 if (va.va_flags & OPAQUE) { 491 vput(lvp); 492 lvp = NULL; 493 } 494 } 495 496 if (lvp != NULLVP) { 497 error = VOP_OPEN(lvp, FREAD, fp->f_cred, p); 498 VOP_UNLOCK(lvp, 0); 499 500 if (error) { 501 vrele(lvp); 502 goto out; 503 } 504 fp->f_data = (caddr_t) lvp; 505 fp->f_offset = 0; 506 error = vn_close(vp, FREAD, fp->f_cred, p); 507 if (error) 508 goto out; 509 vp = lvp; 510 goto unionread; 511 } 512 } 513 } 514 #endif /* UNION */ 515 516 if ((SCARG(uap, count) == auio.uio_resid) && 517 (vp->v_flag & VROOT) && 518 (vp->v_mount->mnt_flag & MNT_UNION)) { 519 struct vnode *tvp = vp; 520 vp = vp->v_mount->mnt_vnodecovered; 521 VREF(vp); 522 fp->f_data = (caddr_t) vp; 523 fp->f_offset = 0; 524 vrele(tvp); 525 goto unionread; 526 } 527 error = copyout((caddr_t)&loff, (caddr_t)SCARG(uap, basep), 528 sizeof(long)); 529 *retval = SCARG(uap, count) - auio.uio_resid; 530 out: 531 FILE_UNUSE(fp, p); 532 return (error); 533 } 534
Indexes created Mon Sep 29 21:09:56 GMT 2025