vfs_syscalls_43.c revision 1.48
1 /* $NetBSD: vfs_syscalls_43.c,v 1.48 2008/11/19 18:36:02 ad 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 1.48 2008/11/19 18:36:02 ad 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 #include <sys/sysctl.h> 65 66 #include <sys/mount.h> 67 #include <sys/syscallargs.h> 68 #include <sys/vfs_syscalls.h> 69 70 #include <compat/sys/stat.h> 71 #include <compat/sys/mount.h> 72 73 #include <compat/common/compat_util.h> 74 75 static void cvtstat(struct stat *, struct stat43 *); 76 77 /* 78 * Convert from an old to a new stat structure. 79 */ 80 static void 81 cvtstat(struct stat *st, struct stat43 *ost) 82 { 83 84 ost->st_dev = st->st_dev; 85 ost->st_ino = st->st_ino; 86 ost->st_mode = st->st_mode & 0xffff; 87 ost->st_nlink = st->st_nlink; 88 ost->st_uid = st->st_uid; 89 ost->st_gid = st->st_gid; 90 ost->st_rdev = st->st_rdev; 91 if (st->st_size < (quad_t)1 << 32) 92 ost->st_size = st->st_size; 93 else 94 ost->st_size = -2; 95 ost->st_atime = st->st_atime; 96 ost->st_mtime = st->st_mtime; 97 ost->st_ctime = st->st_ctime; 98 ost->st_blksize = st->st_blksize; 99 ost->st_blocks = st->st_blocks; 100 ost->st_flags = st->st_flags; 101 ost->st_gen = st->st_gen; 102 } 103 104 /* 105 * Get file status; this version follows links. 106 */ 107 /* ARGSUSED */ 108 int 109 compat_43_sys_stat(struct lwp *l, const struct compat_43_sys_stat_args *uap, register_t *retval) 110 { 111 /* { 112 syscallarg(char *) path; 113 syscallarg(struct stat43 *) ub; 114 } */ 115 struct stat sb; 116 struct stat43 osb; 117 int error; 118 119 error = do_sys_stat(SCARG(uap, path), FOLLOW, &sb); 120 if (error) 121 return (error); 122 cvtstat(&sb, &osb); 123 error = copyout((void *)&osb, (void *)SCARG(uap, ub), sizeof (osb)); 124 return (error); 125 } 126 127 /* 128 * Get file status; this version does not follow links. 129 */ 130 /* ARGSUSED */ 131 int 132 compat_43_sys_lstat(struct lwp *l, const struct compat_43_sys_lstat_args *uap, register_t *retval) 133 { 134 /* { 135 syscallarg(char *) path; 136 syscallarg(struct ostat *) ub; 137 } */ 138 struct vnode *vp, *dvp; 139 struct stat sb, sb1; 140 struct stat43 osb; 141 int error; 142 struct nameidata nd; 143 int ndflags; 144 145 ndflags = NOFOLLOW | LOCKLEAF | LOCKPARENT | TRYEMULROOT; 146 again: 147 NDINIT(&nd, LOOKUP, ndflags, UIO_USERSPACE, SCARG(uap, path)); 148 if ((error = namei(&nd))) { 149 if (error == EISDIR && (ndflags & LOCKPARENT) != 0) { 150 /* 151 * Should only happen on '/'. Retry without LOCKPARENT; 152 * this is safe since the vnode won't be a VLNK. 153 */ 154 ndflags &= ~LOCKPARENT; 155 goto again; 156 } 157 return (error); 158 } 159 /* 160 * For symbolic links, always return the attributes of its 161 * containing directory, except for mode, size, and links. 162 */ 163 vp = nd.ni_vp; 164 dvp = nd.ni_dvp; 165 if (vp->v_type != VLNK) { 166 if ((ndflags & LOCKPARENT) != 0) { 167 if (dvp == vp) 168 vrele(dvp); 169 else 170 vput(dvp); 171 } 172 error = vn_stat(vp, &sb); 173 vput(vp); 174 if (error) 175 return (error); 176 } else { 177 error = vn_stat(dvp, &sb); 178 vput(dvp); 179 if (error) { 180 vput(vp); 181 return (error); 182 } 183 error = vn_stat(vp, &sb1); 184 vput(vp); 185 if (error) 186 return (error); 187 sb.st_mode &= ~S_IFDIR; 188 sb.st_mode |= S_IFLNK; 189 sb.st_nlink = sb1.st_nlink; 190 sb.st_size = sb1.st_size; 191 sb.st_blocks = sb1.st_blocks; 192 } 193 cvtstat(&sb, &osb); 194 error = copyout((void *)&osb, (void *)SCARG(uap, ub), sizeof (osb)); 195 return (error); 196 } 197 198 /* 199 * Return status information about a file descriptor. 200 */ 201 /* ARGSUSED */ 202 int 203 compat_43_sys_fstat(struct lwp *l, const struct compat_43_sys_fstat_args *uap, register_t *retval) 204 { 205 /* { 206 syscallarg(int) fd; 207 syscallarg(struct stat43 *) sb; 208 } */ 209 int fd = SCARG(uap, fd); 210 struct file *fp; 211 struct stat ub; 212 struct stat43 oub; 213 int error; 214 215 if ((fp = fd_getfile(fd)) == NULL) 216 return (EBADF); 217 error = (*fp->f_ops->fo_stat)(fp, &ub); 218 fd_putfile(fd); 219 if (error == 0) { 220 cvtstat(&ub, &oub); 221 error = copyout((void *)&oub, (void *)SCARG(uap, sb), 222 sizeof (oub)); 223 } 224 225 226 return (error); 227 } 228 229 230 /* 231 * Truncate a file given a file descriptor. 232 */ 233 /* ARGSUSED */ 234 int 235 compat_43_sys_ftruncate(struct lwp *l, const struct compat_43_sys_ftruncate_args *uap, register_t *retval) 236 { 237 /* { 238 syscallarg(int) fd; 239 syscallarg(long) length; 240 } */ 241 struct sys_ftruncate_args /* { 242 syscallarg(int) fd; 243 syscallarg(int) pad; 244 syscallarg(off_t) length; 245 } */ nuap; 246 247 SCARG(&nuap, fd) = SCARG(uap, fd); 248 SCARG(&nuap, length) = SCARG(uap, length); 249 return (sys_ftruncate(l, &nuap, retval)); 250 } 251 252 /* 253 * Truncate a file given its path name. 254 */ 255 /* ARGSUSED */ 256 int 257 compat_43_sys_truncate(struct lwp *l, const struct compat_43_sys_truncate_args *uap, register_t *retval) 258 { 259 /* { 260 syscallarg(char *) path; 261 syscallarg(long) length; 262 } */ 263 struct sys_truncate_args /* { 264 syscallarg(char *) path; 265 syscallarg(int) pad; 266 syscallarg(off_t) length; 267 } */ nuap; 268 269 SCARG(&nuap, path) = SCARG(uap, path); 270 SCARG(&nuap, length) = SCARG(uap, length); 271 return (sys_truncate(l, &nuap, retval)); 272 } 273 274 275 /* 276 * Reposition read/write file offset. 277 */ 278 int 279 compat_43_sys_lseek(struct lwp *l, const struct compat_43_sys_lseek_args *uap, register_t *retval) 280 { 281 /* { 282 syscallarg(int) fd; 283 syscallarg(long) offset; 284 syscallarg(int) whence; 285 } */ 286 struct sys_lseek_args /* { 287 syscallarg(int) fd; 288 syscallarg(int) pad; 289 syscallarg(off_t) offset; 290 syscallarg(int) whence; 291 } */ nuap; 292 off_t qret; 293 int error; 294 295 SCARG(&nuap, fd) = SCARG(uap, fd); 296 SCARG(&nuap, offset) = SCARG(uap, offset); 297 SCARG(&nuap, whence) = SCARG(uap, whence); 298 error = sys_lseek(l, &nuap, (void *)&qret); 299 *(long *)retval = qret; 300 return (error); 301 } 302 303 304 /* 305 * Create a file. 306 */ 307 int 308 compat_43_sys_creat(struct lwp *l, const struct compat_43_sys_creat_args *uap, register_t *retval) 309 { 310 /* { 311 syscallarg(char *) path; 312 syscallarg(int) mode; 313 } */ 314 struct sys_open_args /* { 315 syscallarg(char *) path; 316 syscallarg(int) flags; 317 syscallarg(int) mode; 318 } */ nuap; 319 320 SCARG(&nuap, path) = SCARG(uap, path); 321 SCARG(&nuap, mode) = SCARG(uap, mode); 322 SCARG(&nuap, flags) = O_WRONLY | O_CREAT | O_TRUNC; 323 return (sys_open(l, &nuap, retval)); 324 } 325 326 /*ARGSUSED*/ 327 int 328 compat_43_sys_quota(struct lwp *l, const void *v, register_t *retval) 329 { 330 331 return (ENOSYS); 332 } 333 334 335 /* 336 * Read a block of directory entries in a file system independent format. 337 */ 338 int 339 compat_43_sys_getdirentries(struct lwp *l, const struct compat_43_sys_getdirentries_args *uap, register_t *retval) 340 { 341 /* { 342 syscallarg(int) fd; 343 syscallarg(char *) buf; 344 syscallarg(u_int) count; 345 syscallarg(long *) basep; 346 } */ 347 struct vnode *vp; 348 struct file *fp; 349 struct uio auio, kuio; 350 struct iovec aiov, kiov; 351 struct dirent *dp, *edp; 352 char *dirbuf; 353 size_t count = min(MAXBSIZE, (size_t)SCARG(uap, count)); 354 355 int error, eofflag, readcnt; 356 long loff; 357 358 /* fd_getvnode() will use the descriptor for us */ 359 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 360 return (error); 361 if ((fp->f_flag & FREAD) == 0) { 362 error = EBADF; 363 goto out; 364 } 365 vp = (struct vnode *)fp->f_data; 366 unionread: 367 if (vp->v_type != VDIR) { 368 error = EINVAL; 369 goto out; 370 } 371 aiov.iov_base = SCARG(uap, buf); 372 aiov.iov_len = count; 373 auio.uio_iov = &aiov; 374 auio.uio_iovcnt = 1; 375 auio.uio_rw = UIO_READ; 376 auio.uio_resid = count; 377 KASSERT(l == curlwp); 378 auio.uio_vmspace = curproc->p_vmspace; 379 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 380 loff = auio.uio_offset = fp->f_offset; 381 # if (BYTE_ORDER != LITTLE_ENDIAN) 382 if ((vp->v_mount->mnt_iflag & IMNT_DTYPE) == 0) { 383 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, 384 (off_t **)0, (int *)0); 385 fp->f_offset = auio.uio_offset; 386 } else 387 # endif 388 { 389 kuio = auio; 390 kuio.uio_iov = &kiov; 391 kiov.iov_len = count; 392 dirbuf = malloc(count, M_TEMP, M_WAITOK); 393 kiov.iov_base = dirbuf; 394 UIO_SETUP_SYSSPACE(&kuio); 395 error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag, 396 (off_t **)0, (int *)0); 397 fp->f_offset = kuio.uio_offset; 398 if (error == 0) { 399 readcnt = count - kuio.uio_resid; 400 edp = (struct dirent *)&dirbuf[readcnt]; 401 for (dp = (struct dirent *)dirbuf; dp < edp; ) { 402 # if (BYTE_ORDER == LITTLE_ENDIAN) 403 /* 404 * The expected low byte of 405 * dp->d_namlen is our dp->d_type. 406 * The high MBZ byte of dp->d_namlen 407 * is our dp->d_namlen. 408 */ 409 dp->d_type = dp->d_namlen; 410 dp->d_namlen = 0; 411 # else 412 /* 413 * The dp->d_type is the high byte 414 * of the expected dp->d_namlen, 415 * so must be zero'ed. 416 */ 417 dp->d_type = 0; 418 # endif 419 if (dp->d_reclen > 0) { 420 dp = (struct dirent *) 421 ((char *)dp + dp->d_reclen); 422 } else { 423 error = EIO; 424 break; 425 } 426 } 427 if (dp >= edp) 428 error = uiomove(dirbuf, readcnt, &auio); 429 } 430 free(dirbuf, M_TEMP); 431 } 432 VOP_UNLOCK(vp, 0); 433 if (error) 434 goto out; 435 436 if ((count == auio.uio_resid) && 437 (vp->v_vflag & VV_ROOT) && 438 (vp->v_mount->mnt_flag & MNT_UNION)) { 439 struct vnode *tvp = vp; 440 vp = vp->v_mount->mnt_vnodecovered; 441 VREF(vp); 442 fp->f_data = (void *) vp; 443 fp->f_offset = 0; 444 vrele(tvp); 445 goto unionread; 446 } 447 error = copyout((void *)&loff, (void *)SCARG(uap, basep), 448 sizeof(long)); 449 *retval = count - auio.uio_resid; 450 out: 451 fd_putfile(SCARG(uap, fd)); 452 return (error); 453 } 454 455 /* 456 * sysctl helper routine for vfs.generic.conf lookups. 457 */ 458 #if defined(COMPAT_09) || defined(COMPAT_43) || defined(COMPAT_44) 459 static struct sysctllog *compat_clog; 460 461 static int 462 sysctl_vfs_generic_conf(SYSCTLFN_ARGS) 463 { 464 struct vfsconf vfc; 465 extern const char * const mountcompatnames[]; 466 extern int nmountcompatnames; 467 struct sysctlnode node; 468 struct vfsops *vfsp; 469 u_int vfsnum; 470 471 if (namelen != 1) 472 return (ENOTDIR); 473 vfsnum = name[0]; 474 if (vfsnum >= nmountcompatnames || 475 mountcompatnames[vfsnum] == NULL) 476 return (EOPNOTSUPP); 477 vfsp = vfs_getopsbyname(mountcompatnames[vfsnum]); 478 if (vfsp == NULL) 479 return (EOPNOTSUPP); 480 481 vfc.vfc_vfsops = vfsp; 482 strncpy(vfc.vfc_name, vfsp->vfs_name, sizeof(vfc.vfc_name)); 483 vfc.vfc_typenum = vfsnum; 484 vfc.vfc_refcount = vfsp->vfs_refcount; 485 vfc.vfc_flags = 0; 486 vfc.vfc_mountroot = vfsp->vfs_mountroot; 487 vfc.vfc_next = NULL; 488 vfs_delref(vfsp); 489 490 node = *rnode; 491 node.sysctl_data = &vfc; 492 return (sysctl_lookup(SYSCTLFN_CALL(&node))); 493 } 494 495 /* 496 * Top level filesystem related information gathering. 497 */ 498 void 499 compat_sysctl_init(void) 500 { 501 extern int nmountcompatnames; 502 503 sysctl_createv(&compat_clog, 0, NULL, NULL, 504 CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE, 505 CTLTYPE_INT, "maxtypenum", 506 SYSCTL_DESCR("Highest valid filesystem type number"), 507 NULL, nmountcompatnames, NULL, 0, 508 CTL_VFS, VFS_GENERIC, VFS_MAXTYPENUM, CTL_EOL); 509 sysctl_createv(&compat_clog, 0, NULL, NULL, 510 CTLFLAG_PERMANENT, 511 CTLTYPE_STRUCT, "conf", 512 SYSCTL_DESCR("Filesystem configuration information"), 513 sysctl_vfs_generic_conf, 0, NULL, 514 sizeof(struct vfsconf), 515 CTL_VFS, VFS_GENERIC, VFS_CONF, CTL_EOL); 516 } 517 518 void 519 compat_sysctl_fini(void) 520 { 521 522 sysctl_teardown(&compat_clog); 523 } 524 #endif 525
Indexes created Tue Sep 30 11:09:46 GMT 2025