vfs_syscalls_43.c revision 1.49
1 /* $NetBSD: vfs_syscalls_43.c,v 1.49 2009/01/26 13:00:04 njoly 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 1.49 2009/01/26 13:00:04 njoly 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 struct stat ub; 210 struct stat43 oub; 211 int error; 212 213 error = do_sys_fstat(SCARG(uap, fd), &ub); 214 if (error == 0) { 215 cvtstat(&ub, &oub); 216 error = copyout((void *)&oub, (void *)SCARG(uap, sb), 217 sizeof (oub)); 218 } 219 220 return (error); 221 } 222 223 224 /* 225 * Truncate a file given a file descriptor. 226 */ 227 /* ARGSUSED */ 228 int 229 compat_43_sys_ftruncate(struct lwp *l, const struct compat_43_sys_ftruncate_args *uap, register_t *retval) 230 { 231 /* { 232 syscallarg(int) fd; 233 syscallarg(long) length; 234 } */ 235 struct sys_ftruncate_args /* { 236 syscallarg(int) fd; 237 syscallarg(int) pad; 238 syscallarg(off_t) length; 239 } */ nuap; 240 241 SCARG(&nuap, fd) = SCARG(uap, fd); 242 SCARG(&nuap, length) = SCARG(uap, length); 243 return (sys_ftruncate(l, &nuap, retval)); 244 } 245 246 /* 247 * Truncate a file given its path name. 248 */ 249 /* ARGSUSED */ 250 int 251 compat_43_sys_truncate(struct lwp *l, const struct compat_43_sys_truncate_args *uap, register_t *retval) 252 { 253 /* { 254 syscallarg(char *) path; 255 syscallarg(long) length; 256 } */ 257 struct sys_truncate_args /* { 258 syscallarg(char *) path; 259 syscallarg(int) pad; 260 syscallarg(off_t) length; 261 } */ nuap; 262 263 SCARG(&nuap, path) = SCARG(uap, path); 264 SCARG(&nuap, length) = SCARG(uap, length); 265 return (sys_truncate(l, &nuap, retval)); 266 } 267 268 269 /* 270 * Reposition read/write file offset. 271 */ 272 int 273 compat_43_sys_lseek(struct lwp *l, const struct compat_43_sys_lseek_args *uap, register_t *retval) 274 { 275 /* { 276 syscallarg(int) fd; 277 syscallarg(long) offset; 278 syscallarg(int) whence; 279 } */ 280 struct sys_lseek_args /* { 281 syscallarg(int) fd; 282 syscallarg(int) pad; 283 syscallarg(off_t) offset; 284 syscallarg(int) whence; 285 } */ nuap; 286 off_t qret; 287 int error; 288 289 SCARG(&nuap, fd) = SCARG(uap, fd); 290 SCARG(&nuap, offset) = SCARG(uap, offset); 291 SCARG(&nuap, whence) = SCARG(uap, whence); 292 error = sys_lseek(l, &nuap, (void *)&qret); 293 *(long *)retval = qret; 294 return (error); 295 } 296 297 298 /* 299 * Create a file. 300 */ 301 int 302 compat_43_sys_creat(struct lwp *l, const struct compat_43_sys_creat_args *uap, register_t *retval) 303 { 304 /* { 305 syscallarg(char *) path; 306 syscallarg(int) mode; 307 } */ 308 struct sys_open_args /* { 309 syscallarg(char *) path; 310 syscallarg(int) flags; 311 syscallarg(int) mode; 312 } */ nuap; 313 314 SCARG(&nuap, path) = SCARG(uap, path); 315 SCARG(&nuap, mode) = SCARG(uap, mode); 316 SCARG(&nuap, flags) = O_WRONLY | O_CREAT | O_TRUNC; 317 return (sys_open(l, &nuap, retval)); 318 } 319 320 /*ARGSUSED*/ 321 int 322 compat_43_sys_quota(struct lwp *l, const void *v, register_t *retval) 323 { 324 325 return (ENOSYS); 326 } 327 328 329 /* 330 * Read a block of directory entries in a file system independent format. 331 */ 332 int 333 compat_43_sys_getdirentries(struct lwp *l, const struct compat_43_sys_getdirentries_args *uap, register_t *retval) 334 { 335 /* { 336 syscallarg(int) fd; 337 syscallarg(char *) buf; 338 syscallarg(u_int) count; 339 syscallarg(long *) basep; 340 } */ 341 struct vnode *vp; 342 struct file *fp; 343 struct uio auio, kuio; 344 struct iovec aiov, kiov; 345 struct dirent *dp, *edp; 346 char *dirbuf; 347 size_t count = min(MAXBSIZE, (size_t)SCARG(uap, count)); 348 349 int error, eofflag, readcnt; 350 long loff; 351 352 /* fd_getvnode() will use the descriptor for us */ 353 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 354 return (error); 355 if ((fp->f_flag & FREAD) == 0) { 356 error = EBADF; 357 goto out; 358 } 359 vp = (struct vnode *)fp->f_data; 360 unionread: 361 if (vp->v_type != VDIR) { 362 error = EINVAL; 363 goto out; 364 } 365 aiov.iov_base = SCARG(uap, buf); 366 aiov.iov_len = count; 367 auio.uio_iov = &aiov; 368 auio.uio_iovcnt = 1; 369 auio.uio_rw = UIO_READ; 370 auio.uio_resid = count; 371 KASSERT(l == curlwp); 372 auio.uio_vmspace = curproc->p_vmspace; 373 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 374 loff = auio.uio_offset = fp->f_offset; 375 # if (BYTE_ORDER != LITTLE_ENDIAN) 376 if ((vp->v_mount->mnt_iflag & IMNT_DTYPE) == 0) { 377 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, 378 (off_t **)0, (int *)0); 379 fp->f_offset = auio.uio_offset; 380 } else 381 # endif 382 { 383 kuio = auio; 384 kuio.uio_iov = &kiov; 385 kiov.iov_len = count; 386 dirbuf = malloc(count, M_TEMP, M_WAITOK); 387 kiov.iov_base = dirbuf; 388 UIO_SETUP_SYSSPACE(&kuio); 389 error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag, 390 (off_t **)0, (int *)0); 391 fp->f_offset = kuio.uio_offset; 392 if (error == 0) { 393 readcnt = count - kuio.uio_resid; 394 edp = (struct dirent *)&dirbuf[readcnt]; 395 for (dp = (struct dirent *)dirbuf; dp < edp; ) { 396 # if (BYTE_ORDER == LITTLE_ENDIAN) 397 /* 398 * The expected low byte of 399 * dp->d_namlen is our dp->d_type. 400 * The high MBZ byte of dp->d_namlen 401 * is our dp->d_namlen. 402 */ 403 dp->d_type = dp->d_namlen; 404 dp->d_namlen = 0; 405 # else 406 /* 407 * The dp->d_type is the high byte 408 * of the expected dp->d_namlen, 409 * so must be zero'ed. 410 */ 411 dp->d_type = 0; 412 # endif 413 if (dp->d_reclen > 0) { 414 dp = (struct dirent *) 415 ((char *)dp + dp->d_reclen); 416 } else { 417 error = EIO; 418 break; 419 } 420 } 421 if (dp >= edp) 422 error = uiomove(dirbuf, readcnt, &auio); 423 } 424 free(dirbuf, M_TEMP); 425 } 426 VOP_UNLOCK(vp, 0); 427 if (error) 428 goto out; 429 430 if ((count == auio.uio_resid) && 431 (vp->v_vflag & VV_ROOT) && 432 (vp->v_mount->mnt_flag & MNT_UNION)) { 433 struct vnode *tvp = vp; 434 vp = vp->v_mount->mnt_vnodecovered; 435 VREF(vp); 436 fp->f_data = (void *) vp; 437 fp->f_offset = 0; 438 vrele(tvp); 439 goto unionread; 440 } 441 error = copyout((void *)&loff, (void *)SCARG(uap, basep), 442 sizeof(long)); 443 *retval = count - auio.uio_resid; 444 out: 445 fd_putfile(SCARG(uap, fd)); 446 return (error); 447 } 448 449 /* 450 * sysctl helper routine for vfs.generic.conf lookups. 451 */ 452 #if defined(COMPAT_09) || defined(COMPAT_43) || defined(COMPAT_44) 453 static struct sysctllog *compat_clog; 454 455 static int 456 sysctl_vfs_generic_conf(SYSCTLFN_ARGS) 457 { 458 struct vfsconf vfc; 459 extern const char * const mountcompatnames[]; 460 extern int nmountcompatnames; 461 struct sysctlnode node; 462 struct vfsops *vfsp; 463 u_int vfsnum; 464 465 if (namelen != 1) 466 return (ENOTDIR); 467 vfsnum = name[0]; 468 if (vfsnum >= nmountcompatnames || 469 mountcompatnames[vfsnum] == NULL) 470 return (EOPNOTSUPP); 471 vfsp = vfs_getopsbyname(mountcompatnames[vfsnum]); 472 if (vfsp == NULL) 473 return (EOPNOTSUPP); 474 475 vfc.vfc_vfsops = vfsp; 476 strncpy(vfc.vfc_name, vfsp->vfs_name, sizeof(vfc.vfc_name)); 477 vfc.vfc_typenum = vfsnum; 478 vfc.vfc_refcount = vfsp->vfs_refcount; 479 vfc.vfc_flags = 0; 480 vfc.vfc_mountroot = vfsp->vfs_mountroot; 481 vfc.vfc_next = NULL; 482 vfs_delref(vfsp); 483 484 node = *rnode; 485 node.sysctl_data = &vfc; 486 return (sysctl_lookup(SYSCTLFN_CALL(&node))); 487 } 488 489 /* 490 * Top level filesystem related information gathering. 491 */ 492 void 493 compat_sysctl_init(void) 494 { 495 extern int nmountcompatnames; 496 497 sysctl_createv(&compat_clog, 0, NULL, NULL, 498 CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE, 499 CTLTYPE_INT, "maxtypenum", 500 SYSCTL_DESCR("Highest valid filesystem type number"), 501 NULL, nmountcompatnames, NULL, 0, 502 CTL_VFS, VFS_GENERIC, VFS_MAXTYPENUM, CTL_EOL); 503 sysctl_createv(&compat_clog, 0, NULL, NULL, 504 CTLFLAG_PERMANENT, 505 CTLTYPE_STRUCT, "conf", 506 SYSCTL_DESCR("Filesystem configuration information"), 507 sysctl_vfs_generic_conf, 0, NULL, 508 sizeof(struct vfsconf), 509 CTL_VFS, VFS_GENERIC, VFS_CONF, CTL_EOL); 510 } 511 512 void 513 compat_sysctl_fini(void) 514 { 515 516 sysctl_teardown(&compat_clog); 517 } 518 #endif 519
Indexes created Mon Sep 29 21:09:56 GMT 2025