vfs_syscalls_43.c revision 1.24.2.3
1 /* $NetBSD: vfs_syscalls_43.c,v 1.24.2.3 2004/08/25 06:57:33 skrll 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. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)vfs_syscalls.c 8.28 (Berkeley) 12/10/94 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls_43.c,v 1.24.2.3 2004/08/25 06:57:33 skrll Exp $"); 41 42 #if defined(_KERNEL_OPT) 43 #include "fs_union.h" 44 #endif 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/filedesc.h> 49 #include <sys/kernel.h> 50 #include <sys/proc.h> 51 #include <sys/file.h> 52 #include <sys/vnode.h> 53 #include <sys/namei.h> 54 #include <sys/dirent.h> 55 #include <sys/socket.h> 56 #include <sys/socketvar.h> 57 #include <sys/stat.h> 58 #include <sys/malloc.h> 59 #include <sys/ioctl.h> 60 #include <sys/fcntl.h> 61 #include <sys/syslog.h> 62 #include <sys/unistd.h> 63 #include <sys/resourcevar.h> 64 65 #include <sys/mount.h> 66 #include <sys/sa.h> 67 #include <sys/syscallargs.h> 68 69 static void cvtstat __P((struct stat *, struct stat43 *)); 70 71 /* 72 * Convert from an old to a new stat structure. 73 */ 74 static void 75 cvtstat(st, ost) 76 struct stat *st; 77 struct stat43 *ost; 78 { 79 80 ost->st_dev = st->st_dev; 81 ost->st_ino = st->st_ino; 82 ost->st_mode = st->st_mode & 0xffff; 83 ost->st_nlink = st->st_nlink; 84 ost->st_uid = st->st_uid; 85 ost->st_gid = st->st_gid; 86 ost->st_rdev = st->st_rdev; 87 if (st->st_size < (quad_t)1 << 32) 88 ost->st_size = st->st_size; 89 else 90 ost->st_size = -2; 91 ost->st_atime = st->st_atime; 92 ost->st_mtime = st->st_mtime; 93 ost->st_ctime = st->st_ctime; 94 ost->st_blksize = st->st_blksize; 95 ost->st_blocks = st->st_blocks; 96 ost->st_flags = st->st_flags; 97 ost->st_gen = st->st_gen; 98 } 99 100 /* 101 * Get file status; this version follows links. 102 */ 103 /* ARGSUSED */ 104 int 105 compat_43_sys_stat(struct lwp *l, void *v, register_t *retval) 106 { 107 struct compat_43_sys_stat_args /* { 108 syscallarg(char *) path; 109 syscallarg(struct stat43 *) ub; 110 } */ *uap = v; 111 struct stat sb; 112 struct stat43 osb; 113 int error; 114 struct nameidata nd; 115 116 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 117 SCARG(uap, path), l); 118 if ((error = namei(&nd)) != 0) 119 return (error); 120 error = vn_stat(nd.ni_vp, &sb, l); 121 vput(nd.ni_vp); 122 if (error) 123 return (error); 124 cvtstat(&sb, &osb); 125 error = copyout((caddr_t)&osb, (caddr_t)SCARG(uap, ub), sizeof (osb)); 126 return (error); 127 } 128 129 /* 130 * Get file status; this version does not follow links. 131 */ 132 /* ARGSUSED */ 133 int 134 compat_43_sys_lstat(struct lwp *l, void *v, register_t *retval) 135 { 136 struct compat_43_sys_lstat_args /* { 137 syscallarg(char *) path; 138 syscallarg(struct ostat *) ub; 139 } */ *uap = v; 140 struct vnode *vp, *dvp; 141 struct stat sb, sb1; 142 struct stat43 osb; 143 int error; 144 struct nameidata nd; 145 int ndflags; 146 147 ndflags = NOFOLLOW | LOCKLEAF | LOCKPARENT; 148 again: 149 NDINIT(&nd, LOOKUP, ndflags, UIO_USERSPACE, SCARG(uap, path), l); 150 if ((error = namei(&nd))) { 151 if (error == EISDIR && (ndflags & LOCKPARENT) != 0) { 152 /* 153 * Should only happen on '/'. Retry without LOCKPARENT; 154 * this is safe since the vnode won't be a VLNK. 155 */ 156 ndflags &= ~LOCKPARENT; 157 goto again; 158 } 159 return (error); 160 } 161 /* 162 * For symbolic links, always return the attributes of its 163 * containing directory, except for mode, size, and links. 164 */ 165 vp = nd.ni_vp; 166 dvp = nd.ni_dvp; 167 if (vp->v_type != VLNK) { 168 if ((ndflags & LOCKPARENT) != 0) { 169 if (dvp == vp) 170 vrele(dvp); 171 else 172 vput(dvp); 173 } 174 error = vn_stat(vp, &sb, l); 175 vput(vp); 176 if (error) 177 return (error); 178 } else { 179 error = vn_stat(dvp, &sb, l); 180 vput(dvp); 181 if (error) { 182 vput(vp); 183 return (error); 184 } 185 error = vn_stat(vp, &sb1, l); 186 vput(vp); 187 if (error) 188 return (error); 189 sb.st_mode &= ~S_IFDIR; 190 sb.st_mode |= S_IFLNK; 191 sb.st_nlink = sb1.st_nlink; 192 sb.st_size = sb1.st_size; 193 sb.st_blocks = sb1.st_blocks; 194 } 195 cvtstat(&sb, &osb); 196 error = copyout((caddr_t)&osb, (caddr_t)SCARG(uap, ub), sizeof (osb)); 197 return (error); 198 } 199 200 /* 201 * Return status information about a file descriptor. 202 */ 203 /* ARGSUSED */ 204 int 205 compat_43_sys_fstat(struct lwp *l, void *v, register_t *retval) 206 { 207 struct compat_43_sys_fstat_args /* { 208 syscallarg(int) fd; 209 syscallarg(struct stat43 *) sb; 210 } */ *uap = v; 211 struct proc *p = l->l_proc; 212 int fd = SCARG(uap, fd); 213 struct filedesc *fdp = p->p_fd; 214 struct file *fp; 215 struct stat ub; 216 struct stat43 oub; 217 int error; 218 219 if ((fp = fd_getfile(fdp, fd)) == NULL) 220 return (EBADF); 221 222 FILE_USE(fp); 223 error = (*fp->f_ops->fo_stat)(fp, &ub, l); 224 FILE_UNUSE(fp, l); 225 226 if (error == 0) { 227 cvtstat(&ub, &oub); 228 error = copyout((caddr_t)&oub, (caddr_t)SCARG(uap, sb), 229 sizeof (oub)); 230 } 231 232 233 return (error); 234 } 235 236 237 /* 238 * Truncate a file given a file descriptor. 239 */ 240 /* ARGSUSED */ 241 int 242 compat_43_sys_ftruncate(struct lwp *l, void *v, register_t *retval) 243 { 244 struct compat_43_sys_ftruncate_args /* { 245 syscallarg(int) fd; 246 syscallarg(long) length; 247 } */ *uap = v; 248 struct sys_ftruncate_args /* { 249 syscallarg(int) fd; 250 syscallarg(int) pad; 251 syscallarg(off_t) length; 252 } */ nuap; 253 254 SCARG(&nuap, fd) = SCARG(uap, fd); 255 SCARG(&nuap, length) = SCARG(uap, length); 256 return (sys_ftruncate(l, &nuap, retval)); 257 } 258 259 /* 260 * Truncate a file given its path name. 261 */ 262 /* ARGSUSED */ 263 int 264 compat_43_sys_truncate(struct lwp *l, void *v, register_t *retval) 265 { 266 struct compat_43_sys_truncate_args /* { 267 syscallarg(char *) path; 268 syscallarg(long) length; 269 } */ *uap = v; 270 struct sys_truncate_args /* { 271 syscallarg(char *) path; 272 syscallarg(int) pad; 273 syscallarg(off_t) length; 274 } */ nuap; 275 276 SCARG(&nuap, path) = SCARG(uap, path); 277 SCARG(&nuap, length) = SCARG(uap, length); 278 return (sys_truncate(l, &nuap, retval)); 279 } 280 281 282 /* 283 * Reposition read/write file offset. 284 */ 285 int 286 compat_43_sys_lseek(struct lwp *l, void *v, register_t *retval) 287 { 288 struct compat_43_sys_lseek_args /* { 289 syscallarg(int) fd; 290 syscallarg(long) offset; 291 syscallarg(int) whence; 292 } */ *uap = v; 293 struct sys_lseek_args /* { 294 syscallarg(int) fd; 295 syscallarg(int) pad; 296 syscallarg(off_t) offset; 297 syscallarg(int) whence; 298 } */ nuap; 299 off_t qret; 300 int error; 301 302 SCARG(&nuap, fd) = SCARG(uap, fd); 303 SCARG(&nuap, offset) = SCARG(uap, offset); 304 SCARG(&nuap, whence) = SCARG(uap, whence); 305 error = sys_lseek(l, &nuap, (void *)&qret); 306 *(long *)retval = qret; 307 return (error); 308 } 309 310 311 /* 312 * Create a file. 313 */ 314 int 315 compat_43_sys_creat(struct lwp *l, void *v, register_t *retval) 316 { 317 struct compat_43_sys_creat_args /* { 318 syscallarg(char *) path; 319 syscallarg(int) mode; 320 } */ *uap = v; 321 struct sys_open_args /* { 322 syscallarg(char *) path; 323 syscallarg(int) flags; 324 syscallarg(int) mode; 325 } */ nuap; 326 327 SCARG(&nuap, path) = SCARG(uap, path); 328 SCARG(&nuap, mode) = SCARG(uap, mode); 329 SCARG(&nuap, flags) = O_WRONLY | O_CREAT | O_TRUNC; 330 return (sys_open(l, &nuap, retval)); 331 } 332 333 /*ARGSUSED*/ 334 int 335 compat_43_sys_quota(struct lwp *l, void *v, register_t *retval) 336 { 337 338 return (ENOSYS); 339 } 340 341 342 /* 343 * Read a block of directory entries in a file system independent format. 344 */ 345 int 346 compat_43_sys_getdirentries(struct lwp *l, void *v, register_t *retval) 347 { 348 struct compat_43_sys_getdirentries_args /* { 349 syscallarg(int) fd; 350 syscallarg(char *) buf; 351 syscallarg(u_int) count; 352 syscallarg(long *) basep; 353 } */ *uap = v; 354 struct proc *p = l->l_proc; 355 struct vnode *vp; 356 struct file *fp; 357 struct uio auio, kuio; 358 struct iovec aiov, kiov; 359 struct dirent *dp, *edp; 360 caddr_t dirbuf; 361 size_t count = min(MAXBSIZE, (size_t)SCARG(uap, count)); 362 363 int error, eofflag, readcnt; 364 long loff; 365 366 /* getvnode() will use the descriptor for us */ 367 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 368 return (error); 369 if ((fp->f_flag & FREAD) == 0) { 370 error = EBADF; 371 goto out; 372 } 373 vp = (struct vnode *)fp->f_data; 374 unionread: 375 if (vp->v_type != VDIR) { 376 error = EINVAL; 377 goto out; 378 } 379 aiov.iov_base = SCARG(uap, buf); 380 aiov.iov_len = count; 381 auio.uio_iov = &aiov; 382 auio.uio_iovcnt = 1; 383 auio.uio_rw = UIO_READ; 384 auio.uio_segflg = UIO_USERSPACE; 385 auio.uio_lwp = l; 386 auio.uio_resid = count; 387 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 388 loff = auio.uio_offset = fp->f_offset; 389 # if (BYTE_ORDER != LITTLE_ENDIAN) 390 if ((vp->v_mount->mnt_iflag & IMNT_DTYPE) == 0) { 391 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, 392 (off_t **)0, (int *)0); 393 fp->f_offset = auio.uio_offset; 394 } else 395 # endif 396 { 397 kuio = auio; 398 kuio.uio_iov = &kiov; 399 kuio.uio_segflg = UIO_SYSSPACE; 400 kiov.iov_len = count; 401 dirbuf = malloc(count, M_TEMP, M_WAITOK); 402 kiov.iov_base = dirbuf; 403 error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag, 404 (off_t **)0, (int *)0); 405 fp->f_offset = kuio.uio_offset; 406 if (error == 0) { 407 readcnt = count - kuio.uio_resid; 408 edp = (struct dirent *)&dirbuf[readcnt]; 409 for (dp = (struct dirent *)dirbuf; dp < edp; ) { 410 # if (BYTE_ORDER == LITTLE_ENDIAN) 411 /* 412 * The expected low byte of 413 * dp->d_namlen is our dp->d_type. 414 * The high MBZ byte of dp->d_namlen 415 * is our dp->d_namlen. 416 */ 417 dp->d_type = dp->d_namlen; 418 dp->d_namlen = 0; 419 # else 420 /* 421 * The dp->d_type is the high byte 422 * of the expected dp->d_namlen, 423 * so must be zero'ed. 424 */ 425 dp->d_type = 0; 426 # endif 427 if (dp->d_reclen > 0) { 428 dp = (struct dirent *) 429 ((char *)dp + dp->d_reclen); 430 } else { 431 error = EIO; 432 break; 433 } 434 } 435 if (dp >= edp) 436 error = uiomove(dirbuf, readcnt, &auio); 437 } 438 free(dirbuf, M_TEMP); 439 } 440 VOP_UNLOCK(vp, 0); 441 if (error) 442 goto out; 443 444 #ifdef UNION 445 { 446 extern int (**union_vnodeop_p) __P((void *)); 447 extern struct vnode *union_dircache __P((struct vnode *)); 448 449 if ((count == auio.uio_resid) && 450 (vp->v_op == union_vnodeop_p)) { 451 struct vnode *lvp; 452 453 lvp = union_dircache(vp); 454 if (lvp != NULLVP) { 455 struct vattr va; 456 457 /* 458 * If the directory is opaque, 459 * then don't show lower entries 460 */ 461 error = VOP_GETATTR(vp, &va, fp->f_cred, l); 462 if (va.va_flags & OPAQUE) { 463 vput(lvp); 464 lvp = NULL; 465 } 466 } 467 468 if (lvp != NULLVP) { 469 error = VOP_OPEN(lvp, FREAD, fp->f_cred, l); 470 VOP_UNLOCK(lvp, 0); 471 472 if (error) { 473 vrele(lvp); 474 goto out; 475 } 476 fp->f_data = (caddr_t) lvp; 477 fp->f_offset = 0; 478 error = vn_close(vp, FREAD, fp->f_cred, l); 479 if (error) 480 goto out; 481 vp = lvp; 482 goto unionread; 483 } 484 } 485 } 486 #endif /* UNION */ 487 488 if ((count == auio.uio_resid) && 489 (vp->v_flag & VROOT) && 490 (vp->v_mount->mnt_flag & MNT_UNION)) { 491 struct vnode *tvp = vp; 492 vp = vp->v_mount->mnt_vnodecovered; 493 VREF(vp); 494 fp->f_data = (caddr_t) vp; 495 fp->f_offset = 0; 496 vrele(tvp); 497 goto unionread; 498 } 499 error = copyout((caddr_t)&loff, (caddr_t)SCARG(uap, basep), 500 sizeof(long)); 501 *retval = count - auio.uio_resid; 502 out: 503 FILE_UNUSE(fp, l); 504 return (error); 505 } 506
Indexes created Mon Oct 20 20:10:13 GMT 2025