vfs_syscalls_43.c revision 1.28
1 /* $NetBSD: vfs_syscalls_43.c,v 1.28 2004/08/15 07:19:54 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. 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 1.28 2004/08/15 07:19:54 mycroft 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 proc *p = l->l_proc; 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(struct lwp *l, void *v, register_t *retval) 136 { 137 struct compat_43_sys_lstat_args /* { 138 syscallarg(char *) path; 139 syscallarg(struct ostat *) ub; 140 } */ *uap = v; 141 struct proc *p = l->l_proc; 142 struct vnode *vp, *dvp; 143 struct stat sb, sb1; 144 struct stat43 osb; 145 int error; 146 struct nameidata nd; 147 int ndflags; 148 149 ndflags = NOFOLLOW | LOCKLEAF | LOCKPARENT; 150 again: 151 NDINIT(&nd, LOOKUP, ndflags, UIO_USERSPACE, SCARG(uap, path), p); 152 if ((error = namei(&nd))) { 153 if (error == EISDIR && (ndflags & LOCKPARENT) != 0) { 154 /* 155 * Should only happen on '/'. Retry without LOCKPARENT; 156 * this is safe since the vnode won't be a VLNK. 157 */ 158 ndflags &= ~LOCKPARENT; 159 goto again; 160 } 161 return (error); 162 } 163 /* 164 * For symbolic links, always return the attributes of its 165 * containing directory, except for mode, size, and links. 166 */ 167 vp = nd.ni_vp; 168 dvp = nd.ni_dvp; 169 if (vp->v_type != VLNK) { 170 if ((ndflags & LOCKPARENT) != 0) { 171 if (dvp == vp) 172 vrele(dvp); 173 else 174 vput(dvp); 175 } 176 error = vn_stat(vp, &sb, p); 177 vput(vp); 178 if (error) 179 return (error); 180 } else { 181 error = vn_stat(dvp, &sb, p); 182 vput(dvp); 183 if (error) { 184 vput(vp); 185 return (error); 186 } 187 error = vn_stat(vp, &sb1, p); 188 vput(vp); 189 if (error) 190 return (error); 191 sb.st_mode &= ~S_IFDIR; 192 sb.st_mode |= S_IFLNK; 193 sb.st_nlink = sb1.st_nlink; 194 sb.st_size = sb1.st_size; 195 sb.st_blocks = sb1.st_blocks; 196 } 197 cvtstat(&sb, &osb); 198 error = copyout((caddr_t)&osb, (caddr_t)SCARG(uap, ub), sizeof (osb)); 199 return (error); 200 } 201 202 /* 203 * Return status information about a file descriptor. 204 */ 205 /* ARGSUSED */ 206 int 207 compat_43_sys_fstat(struct lwp *l, void *v, register_t *retval) 208 { 209 struct compat_43_sys_fstat_args /* { 210 syscallarg(int) fd; 211 syscallarg(struct stat43 *) sb; 212 } */ *uap = v; 213 struct proc *p = l->l_proc; 214 int fd = SCARG(uap, fd); 215 struct filedesc *fdp = p->p_fd; 216 struct file *fp; 217 struct stat ub; 218 struct stat43 oub; 219 int error; 220 221 if ((fp = fd_getfile(fdp, fd)) == NULL) 222 return (EBADF); 223 224 FILE_USE(fp); 225 error = (*fp->f_ops->fo_stat)(fp, &ub, p); 226 FILE_UNUSE(fp, p); 227 228 if (error == 0) { 229 cvtstat(&ub, &oub); 230 error = copyout((caddr_t)&oub, (caddr_t)SCARG(uap, sb), 231 sizeof (oub)); 232 } 233 234 235 return (error); 236 } 237 238 239 /* 240 * Truncate a file given a file descriptor. 241 */ 242 /* ARGSUSED */ 243 int 244 compat_43_sys_ftruncate(struct lwp *l, void *v, register_t *retval) 245 { 246 struct compat_43_sys_ftruncate_args /* { 247 syscallarg(int) fd; 248 syscallarg(long) length; 249 } */ *uap = v; 250 struct sys_ftruncate_args /* { 251 syscallarg(int) fd; 252 syscallarg(int) pad; 253 syscallarg(off_t) length; 254 } */ nuap; 255 256 SCARG(&nuap, fd) = SCARG(uap, fd); 257 SCARG(&nuap, length) = SCARG(uap, length); 258 return (sys_ftruncate(l, &nuap, retval)); 259 } 260 261 /* 262 * Truncate a file given its path name. 263 */ 264 /* ARGSUSED */ 265 int 266 compat_43_sys_truncate(struct lwp *l, void *v, register_t *retval) 267 { 268 struct compat_43_sys_truncate_args /* { 269 syscallarg(char *) path; 270 syscallarg(long) length; 271 } */ *uap = v; 272 struct sys_truncate_args /* { 273 syscallarg(char *) path; 274 syscallarg(int) pad; 275 syscallarg(off_t) length; 276 } */ nuap; 277 278 SCARG(&nuap, path) = SCARG(uap, path); 279 SCARG(&nuap, length) = SCARG(uap, length); 280 return (sys_truncate(l, &nuap, retval)); 281 } 282 283 284 /* 285 * Reposition read/write file offset. 286 */ 287 int 288 compat_43_sys_lseek(struct lwp *l, void *v, register_t *retval) 289 { 290 struct compat_43_sys_lseek_args /* { 291 syscallarg(int) fd; 292 syscallarg(long) offset; 293 syscallarg(int) whence; 294 } */ *uap = v; 295 struct sys_lseek_args /* { 296 syscallarg(int) fd; 297 syscallarg(int) pad; 298 syscallarg(off_t) offset; 299 syscallarg(int) whence; 300 } */ nuap; 301 off_t qret; 302 int error; 303 304 SCARG(&nuap, fd) = SCARG(uap, fd); 305 SCARG(&nuap, offset) = SCARG(uap, offset); 306 SCARG(&nuap, whence) = SCARG(uap, whence); 307 error = sys_lseek(l, &nuap, (void *)&qret); 308 *(long *)retval = qret; 309 return (error); 310 } 311 312 313 /* 314 * Create a file. 315 */ 316 int 317 compat_43_sys_creat(struct lwp *l, void *v, register_t *retval) 318 { 319 struct compat_43_sys_creat_args /* { 320 syscallarg(char *) path; 321 syscallarg(int) mode; 322 } */ *uap = v; 323 struct sys_open_args /* { 324 syscallarg(char *) path; 325 syscallarg(int) flags; 326 syscallarg(int) mode; 327 } */ nuap; 328 329 SCARG(&nuap, path) = SCARG(uap, path); 330 SCARG(&nuap, mode) = SCARG(uap, mode); 331 SCARG(&nuap, flags) = O_WRONLY | O_CREAT | O_TRUNC; 332 return (sys_open(l, &nuap, retval)); 333 } 334 335 /*ARGSUSED*/ 336 int 337 compat_43_sys_quota(struct lwp *l, void *v, register_t *retval) 338 { 339 340 return (ENOSYS); 341 } 342 343 344 /* 345 * Read a block of directory entries in a file system independent format. 346 */ 347 int 348 compat_43_sys_getdirentries(struct lwp *l, void *v, register_t *retval) 349 { 350 struct compat_43_sys_getdirentries_args /* { 351 syscallarg(int) fd; 352 syscallarg(char *) buf; 353 syscallarg(u_int) count; 354 syscallarg(long *) basep; 355 } */ *uap = v; 356 struct proc *p = l->l_proc; 357 struct vnode *vp; 358 struct file *fp; 359 struct uio auio, kuio; 360 struct iovec aiov, kiov; 361 struct dirent *dp, *edp; 362 caddr_t dirbuf; 363 size_t count = min(MAXBSIZE, (size_t)SCARG(uap, count)); 364 365 int error, eofflag, readcnt; 366 long loff; 367 368 /* getvnode() will use the descriptor for us */ 369 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 370 return (error); 371 if ((fp->f_flag & FREAD) == 0) { 372 error = EBADF; 373 goto out; 374 } 375 vp = (struct vnode *)fp->f_data; 376 unionread: 377 if (vp->v_type != VDIR) { 378 error = EINVAL; 379 goto out; 380 } 381 aiov.iov_base = SCARG(uap, buf); 382 aiov.iov_len = count; 383 auio.uio_iov = &aiov; 384 auio.uio_iovcnt = 1; 385 auio.uio_rw = UIO_READ; 386 auio.uio_segflg = UIO_USERSPACE; 387 auio.uio_procp = p; 388 auio.uio_resid = count; 389 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 390 loff = auio.uio_offset = fp->f_offset; 391 # if (BYTE_ORDER != LITTLE_ENDIAN) 392 if ((vp->v_mount->mnt_iflag & IMNT_DTYPE) == 0) { 393 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, 394 (off_t **)0, (int *)0); 395 fp->f_offset = auio.uio_offset; 396 } else 397 # endif 398 { 399 kuio = auio; 400 kuio.uio_iov = &kiov; 401 kuio.uio_segflg = UIO_SYSSPACE; 402 kiov.iov_len = count; 403 dirbuf = malloc(count, M_TEMP, M_WAITOK); 404 kiov.iov_base = dirbuf; 405 error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag, 406 (off_t **)0, (int *)0); 407 fp->f_offset = kuio.uio_offset; 408 if (error == 0) { 409 readcnt = count - kuio.uio_resid; 410 edp = (struct dirent *)&dirbuf[readcnt]; 411 for (dp = (struct dirent *)dirbuf; dp < edp; ) { 412 # if (BYTE_ORDER == LITTLE_ENDIAN) 413 /* 414 * The expected low byte of 415 * dp->d_namlen is our dp->d_type. 416 * The high MBZ byte of dp->d_namlen 417 * is our dp->d_namlen. 418 */ 419 dp->d_type = dp->d_namlen; 420 dp->d_namlen = 0; 421 # else 422 /* 423 * The dp->d_type is the high byte 424 * of the expected dp->d_namlen, 425 * so must be zero'ed. 426 */ 427 dp->d_type = 0; 428 # endif 429 if (dp->d_reclen > 0) { 430 dp = (struct dirent *) 431 ((char *)dp + dp->d_reclen); 432 } else { 433 error = EIO; 434 break; 435 } 436 } 437 if (dp >= edp) 438 error = uiomove(dirbuf, readcnt, &auio); 439 } 440 free(dirbuf, M_TEMP); 441 } 442 VOP_UNLOCK(vp, 0); 443 if (error) 444 goto out; 445 446 #ifdef UNION 447 { 448 extern int (**union_vnodeop_p) __P((void *)); 449 extern struct vnode *union_dircache __P((struct vnode *)); 450 451 if ((count == auio.uio_resid) && 452 (vp->v_op == union_vnodeop_p)) { 453 struct vnode *lvp; 454 455 lvp = union_dircache(vp); 456 if (lvp != NULLVP) { 457 struct vattr va; 458 459 /* 460 * If the directory is opaque, 461 * then don't show lower entries 462 */ 463 error = VOP_GETATTR(vp, &va, fp->f_cred, p); 464 if (va.va_flags & OPAQUE) { 465 vput(lvp); 466 lvp = NULL; 467 } 468 } 469 470 if (lvp != NULLVP) { 471 error = VOP_OPEN(lvp, FREAD, fp->f_cred, p); 472 VOP_UNLOCK(lvp, 0); 473 474 if (error) { 475 vrele(lvp); 476 goto out; 477 } 478 fp->f_data = (caddr_t) lvp; 479 fp->f_offset = 0; 480 error = vn_close(vp, FREAD, fp->f_cred, p); 481 if (error) 482 goto out; 483 vp = lvp; 484 goto unionread; 485 } 486 } 487 } 488 #endif /* UNION */ 489 490 if ((count == auio.uio_resid) && 491 (vp->v_flag & VROOT) && 492 (vp->v_mount->mnt_flag & MNT_UNION)) { 493 struct vnode *tvp = vp; 494 vp = vp->v_mount->mnt_vnodecovered; 495 VREF(vp); 496 fp->f_data = (caddr_t) vp; 497 fp->f_offset = 0; 498 vrele(tvp); 499 goto unionread; 500 } 501 error = copyout((caddr_t)&loff, (caddr_t)SCARG(uap, basep), 502 sizeof(long)); 503 *retval = count - auio.uio_resid; 504 out: 505 FILE_UNUSE(fp, p); 506 return (error); 507 } 508
Indexes created Mon Sep 29 21:09:56 GMT 2025