vfs_syscalls_43.c revision 1.9
1 /* $NetBSD: vfs_syscalls_43.c,v 1.9 1998/02/19 00:35:26 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 "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; 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 register 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 /* 132 * Get file status; this version does not follow links. 133 */ 134 /* ARGSUSED */ 135 int 136 compat_43_sys_lstat(p, v, retval) 137 struct proc *p; 138 void *v; 139 register_t *retval; 140 { 141 register struct compat_43_sys_lstat_args /* { 142 syscallarg(char *) path; 143 syscallarg(struct stat43 *) ub; 144 } */ *uap = v; 145 struct stat sb; 146 struct stat43 osb; 147 int error; 148 struct nameidata nd; 149 150 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 151 SCARG(uap, path), p); 152 if ((error = namei(&nd)) != 0) 153 return (error); 154 error = vn_stat(nd.ni_vp, &sb, p); 155 vput(nd.ni_vp); 156 if (error) 157 return (error); 158 cvtstat(&sb, &osb); 159 error = copyout(&osb, SCARG(uap, ub), sizeof (osb)); 160 return (error); 161 } 162 163 164 /* 165 * Return status information about a file descriptor. 166 */ 167 /* ARGSUSED */ 168 int 169 compat_43_sys_fstat(p, v, retval) 170 struct proc *p; 171 void *v; 172 register_t *retval; 173 { 174 register struct compat_43_sys_fstat_args /* { 175 syscallarg(int) fd; 176 syscallarg(struct stat43 *) sb; 177 } */ *uap = v; 178 int fd = SCARG(uap, fd); 179 register struct filedesc *fdp = p->p_fd; 180 register struct file *fp; 181 struct stat ub; 182 struct stat43 oub; 183 int error; 184 185 if ((u_int)fd >= fdp->fd_nfiles || 186 (fp = fdp->fd_ofiles[fd]) == NULL) 187 return (EBADF); 188 switch (fp->f_type) { 189 190 case DTYPE_VNODE: 191 error = vn_stat((struct vnode *)fp->f_data, &ub, p); 192 break; 193 194 case DTYPE_SOCKET: 195 error = soo_stat((struct socket *)fp->f_data, &ub); 196 break; 197 198 default: 199 panic("ofstat"); 200 /*NOTREACHED*/ 201 } 202 cvtstat(&ub, &oub); 203 if (error == 0) 204 error = copyout((caddr_t)&oub, (caddr_t)SCARG(uap, sb), 205 sizeof (oub)); 206 return (error); 207 } 208 209 210 /* 211 * Truncate a file given a file descriptor. 212 */ 213 /* ARGSUSED */ 214 int 215 compat_43_sys_ftruncate(p, v, retval) 216 struct proc *p; 217 void *v; 218 register_t *retval; 219 { 220 register struct compat_43_sys_ftruncate_args /* { 221 syscallarg(int) fd; 222 syscallarg(long) length; 223 } */ *uap = v; 224 struct sys_ftruncate_args /* { 225 syscallarg(int) fd; 226 syscallarg(int) pad; 227 syscallarg(off_t) length; 228 } */ nuap; 229 230 SCARG(&nuap, fd) = SCARG(uap, fd); 231 SCARG(&nuap, length) = SCARG(uap, length); 232 return (sys_ftruncate(p, &nuap, retval)); 233 } 234 235 /* 236 * Truncate a file given its path name. 237 */ 238 /* ARGSUSED */ 239 int 240 compat_43_sys_truncate(p, v, retval) 241 struct proc *p; 242 void *v; 243 register_t *retval; 244 { 245 register struct compat_43_sys_truncate_args /* { 246 syscallarg(char *) path; 247 syscallarg(long) length; 248 } */ *uap = v; 249 struct sys_truncate_args /* { 250 syscallarg(char *) path; 251 syscallarg(int) pad; 252 syscallarg(off_t) length; 253 } */ nuap; 254 255 SCARG(&nuap, path) = SCARG(uap, path); 256 SCARG(&nuap, length) = SCARG(uap, length); 257 return (sys_truncate(p, &nuap, retval)); 258 } 259 260 261 /* 262 * Reposition read/write file offset. 263 */ 264 int 265 compat_43_sys_lseek(p, v, retval) 266 struct proc *p; 267 void *v; 268 register_t *retval; 269 { 270 register struct compat_43_sys_lseek_args /* { 271 syscallarg(int) fd; 272 syscallarg(long) offset; 273 syscallarg(int) whence; 274 } */ *uap = v; 275 struct sys_lseek_args /* { 276 syscallarg(int) fd; 277 syscallarg(int) pad; 278 syscallarg(off_t) offset; 279 syscallarg(int) whence; 280 } */ nuap; 281 off_t qret; 282 int error; 283 284 SCARG(&nuap, fd) = SCARG(uap, fd); 285 SCARG(&nuap, offset) = SCARG(uap, offset); 286 SCARG(&nuap, whence) = SCARG(uap, whence); 287 error = sys_lseek(p, &nuap, (register_t *)&qret); 288 *(long *)retval = qret; 289 return (error); 290 } 291 292 293 /* 294 * Create a file. 295 */ 296 int 297 compat_43_sys_creat(p, v, retval) 298 struct proc *p; 299 void *v; 300 register_t *retval; 301 { 302 register struct compat_43_sys_creat_args /* { 303 syscallarg(char *) path; 304 syscallarg(int) mode; 305 } */ *uap = v; 306 struct sys_open_args /* { 307 syscallarg(char *) path; 308 syscallarg(int) flags; 309 syscallarg(int) mode; 310 } */ nuap; 311 312 SCARG(&nuap, path) = SCARG(uap, path); 313 SCARG(&nuap, mode) = SCARG(uap, mode); 314 SCARG(&nuap, flags) = O_WRONLY | O_CREAT | O_TRUNC; 315 return (sys_open(p, &nuap, retval)); 316 } 317 318 /*ARGSUSED*/ 319 int 320 compat_43_sys_quota(p, v, retval) 321 struct proc *p; 322 void *v; 323 register_t *retval; 324 { 325 326 return (ENOSYS); 327 } 328 329 330 /* 331 * Read a block of directory entries in a file system independent format. 332 */ 333 int 334 compat_43_sys_getdirentries(p, v, retval) 335 struct proc *p; 336 void *v; 337 register_t *retval; 338 { 339 register struct compat_43_sys_getdirentries_args /* { 340 syscallarg(int) fd; 341 syscallarg(char *) buf; 342 syscallarg(u_int) count; 343 syscallarg(long *) basep; 344 } */ *uap = v; 345 register struct vnode *vp; 346 struct file *fp; 347 struct uio auio, kuio; 348 struct iovec aiov, kiov; 349 struct dirent *dp, *edp; 350 caddr_t dirbuf; 351 int error, eofflag, readcnt; 352 long loff; 353 354 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 355 return (error); 356 if ((fp->f_flag & FREAD) == 0) 357 return (EBADF); 358 vp = (struct vnode *)fp->f_data; 359 unionread: 360 if (vp->v_type != VDIR) 361 return (EINVAL); 362 aiov.iov_base = SCARG(uap, buf); 363 aiov.iov_len = SCARG(uap, count); 364 auio.uio_iov = &aiov; 365 auio.uio_iovcnt = 1; 366 auio.uio_rw = UIO_READ; 367 auio.uio_segflg = UIO_USERSPACE; 368 auio.uio_procp = p; 369 auio.uio_resid = SCARG(uap, count); 370 VOP_LOCK(vp); 371 loff = auio.uio_offset = fp->f_offset; 372 # if (BYTE_ORDER != LITTLE_ENDIAN) 373 if (vp->v_mount->mnt_maxsymlinklen <= 0) { 374 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, 375 (off_t *)0, 0); 376 fp->f_offset = auio.uio_offset; 377 } else 378 # endif 379 { 380 kuio = auio; 381 kuio.uio_iov = &kiov; 382 kuio.uio_segflg = UIO_SYSSPACE; 383 kiov.iov_len = SCARG(uap, count); 384 MALLOC(dirbuf, caddr_t, SCARG(uap, count), M_TEMP, M_WAITOK); 385 kiov.iov_base = dirbuf; 386 error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag, 387 (off_t *)0, 0); 388 fp->f_offset = kuio.uio_offset; 389 if (error == 0) { 390 readcnt = SCARG(uap, count) - kuio.uio_resid; 391 edp = (struct dirent *)&dirbuf[readcnt]; 392 for (dp = (struct dirent *)dirbuf; dp < edp; ) { 393 # if (BYTE_ORDER == LITTLE_ENDIAN) 394 /* 395 * The expected low byte of 396 * dp->d_namlen is our dp->d_type. 397 * The high MBZ byte of dp->d_namlen 398 * is our dp->d_namlen. 399 */ 400 dp->d_type = dp->d_namlen; 401 dp->d_namlen = 0; 402 # else 403 /* 404 * The dp->d_type is the high byte 405 * of the expected dp->d_namlen, 406 * so must be zero'ed. 407 */ 408 dp->d_type = 0; 409 # endif 410 if (dp->d_reclen > 0) { 411 dp = (struct dirent *) 412 ((char *)dp + dp->d_reclen); 413 } else { 414 error = EIO; 415 break; 416 } 417 } 418 if (dp >= edp) 419 error = uiomove(dirbuf, readcnt, &auio); 420 } 421 FREE(dirbuf, M_TEMP); 422 } 423 VOP_UNLOCK(vp); 424 if (error) 425 return (error); 426 427 #ifdef UNION 428 { 429 extern int (**union_vnodeop_p) __P((void *)); 430 extern struct vnode *union_dircache __P((struct vnode *)); 431 432 if ((SCARG(uap, count) == auio.uio_resid) && 433 (vp->v_op == union_vnodeop_p)) { 434 struct vnode *lvp; 435 436 lvp = union_dircache(vp); 437 if (lvp != NULLVP) { 438 struct vattr va; 439 440 /* 441 * If the directory is opaque, 442 * then don't show lower entries 443 */ 444 error = VOP_GETATTR(vp, &va, fp->f_cred, p); 445 if (va.va_flags & OPAQUE) { 446 vput(lvp); 447 lvp = NULL; 448 } 449 } 450 451 if (lvp != NULLVP) { 452 error = VOP_OPEN(lvp, FREAD, fp->f_cred, p); 453 VOP_UNLOCK(lvp); 454 455 if (error) { 456 vrele(lvp); 457 return (error); 458 } 459 fp->f_data = (caddr_t) lvp; 460 fp->f_offset = 0; 461 error = vn_close(vp, FREAD, fp->f_cred, p); 462 if (error) 463 return (error); 464 vp = lvp; 465 goto unionread; 466 } 467 } 468 } 469 #endif /* UNION */ 470 471 if ((SCARG(uap, count) == auio.uio_resid) && 472 (vp->v_flag & VROOT) && 473 (vp->v_mount->mnt_flag & MNT_UNION)) { 474 struct vnode *tvp = vp; 475 vp = vp->v_mount->mnt_vnodecovered; 476 VREF(vp); 477 fp->f_data = (caddr_t) vp; 478 fp->f_offset = 0; 479 vrele(tvp); 480 goto unionread; 481 } 482 error = copyout((caddr_t)&loff, (caddr_t)SCARG(uap, basep), 483 sizeof(long)); 484 *retval = SCARG(uap, count) - auio.uio_resid; 485 return (error); 486 } 487
Indexes created Tue Sep 30 11:09:46 GMT 2025