Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/compat/common/vfs_syscalls_43.c
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1 /* $NetBSD: vfs_syscalls_43.c,v 1.47 2008/06/24 11:18:15 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 1.47 2008/06/24 11:18:15 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 static void cvtstat(struct stat *, struct stat43 *); 74 75 /* 76 * Convert from an old to a new stat structure. 77 */ 78 static void 79 cvtstat(struct stat *st, struct stat43 *ost) 80 { 81 82 ost->st_dev = st->st_dev; 83 ost->st_ino = st->st_ino; 84 ost->st_mode = st->st_mode & 0xffff; 85 ost->st_nlink = st->st_nlink; 86 ost->st_uid = st->st_uid; 87 ost->st_gid = st->st_gid; 88 ost->st_rdev = st->st_rdev; 89 if (st->st_size < (quad_t)1 << 32) 90 ost->st_size = st->st_size; 91 else 92 ost->st_size = -2; 93 ost->st_atime = st->st_atime; 94 ost->st_mtime = st->st_mtime; 95 ost->st_ctime = st->st_ctime; 96 ost->st_blksize = st->st_blksize; 97 ost->st_blocks = st->st_blocks; 98 ost->st_flags = st->st_flags; 99 ost->st_gen = st->st_gen; 100 } 101 102 /* 103 * Get file status; this version follows links. 104 */ 105 /* ARGSUSED */ 106 int 107 compat_43_sys_stat(struct lwp *l, const struct compat_43_sys_stat_args *uap, register_t *retval) 108 { 109 /* { 110 syscallarg(char *) path; 111 syscallarg(struct stat43 *) ub; 112 } */ 113 struct stat sb; 114 struct stat43 osb; 115 int error; 116 117 error = do_sys_stat(SCARG(uap, path), FOLLOW, &sb); 118 if (error) 119 return (error); 120 cvtstat(&sb, &osb); 121 error = copyout((void *)&osb, (void *)SCARG(uap, ub), sizeof (osb)); 122 return (error); 123 } 124 125 /* 126 * Get file status; this version does not follow links. 127 */ 128 /* ARGSUSED */ 129 int 130 compat_43_sys_lstat(struct lwp *l, const struct compat_43_sys_lstat_args *uap, register_t *retval) 131 { 132 /* { 133 syscallarg(char *) path; 134 syscallarg(struct ostat *) ub; 135 } */ 136 struct vnode *vp, *dvp; 137 struct stat sb, sb1; 138 struct stat43 osb; 139 int error; 140 struct nameidata nd; 141 int ndflags; 142 143 ndflags = NOFOLLOW | LOCKLEAF | LOCKPARENT | TRYEMULROOT; 144 again: 145 NDINIT(&nd, LOOKUP, ndflags, UIO_USERSPACE, SCARG(uap, path)); 146 if ((error = namei(&nd))) { 147 if (error == EISDIR && (ndflags & LOCKPARENT) != 0) { 148 /* 149 * Should only happen on '/'. Retry without LOCKPARENT; 150 * this is safe since the vnode won't be a VLNK. 151 */ 152 ndflags &= ~LOCKPARENT; 153 goto again; 154 } 155 return (error); 156 } 157 /* 158 * For symbolic links, always return the attributes of its 159 * containing directory, except for mode, size, and links. 160 */ 161 vp = nd.ni_vp; 162 dvp = nd.ni_dvp; 163 if (vp->v_type != VLNK) { 164 if ((ndflags & LOCKPARENT) != 0) { 165 if (dvp == vp) 166 vrele(dvp); 167 else 168 vput(dvp); 169 } 170 error = vn_stat(vp, &sb); 171 vput(vp); 172 if (error) 173 return (error); 174 } else { 175 error = vn_stat(dvp, &sb); 176 vput(dvp); 177 if (error) { 178 vput(vp); 179 return (error); 180 } 181 error = vn_stat(vp, &sb1); 182 vput(vp); 183 if (error) 184 return (error); 185 sb.st_mode &= ~S_IFDIR; 186 sb.st_mode |= S_IFLNK; 187 sb.st_nlink = sb1.st_nlink; 188 sb.st_size = sb1.st_size; 189 sb.st_blocks = sb1.st_blocks; 190 } 191 cvtstat(&sb, &osb); 192 error = copyout((void *)&osb, (void *)SCARG(uap, ub), sizeof (osb)); 193 return (error); 194 } 195 196 /* 197 * Return status information about a file descriptor. 198 */ 199 /* ARGSUSED */ 200 int 201 compat_43_sys_fstat(struct lwp *l, const struct compat_43_sys_fstat_args *uap, register_t *retval) 202 { 203 /* { 204 syscallarg(int) fd; 205 syscallarg(struct stat43 *) sb; 206 } */ 207 int fd = SCARG(uap, fd); 208 struct file *fp; 209 struct stat ub; 210 struct stat43 oub; 211 int error; 212 213 if ((fp = fd_getfile(fd)) == NULL) 214 return (EBADF); 215 error = (*fp->f_ops->fo_stat)(fp, &ub); 216 fd_putfile(fd); 217 if (error == 0) { 218 cvtstat(&ub, &oub); 219 error = copyout((void *)&oub, (void *)SCARG(uap, sb), 220 sizeof (oub)); 221 } 222 223 224 return (error); 225 } 226 227 228 /* 229 * Truncate a file given a file descriptor. 230 */ 231 /* ARGSUSED */ 232 int 233 compat_43_sys_ftruncate(struct lwp *l, const struct compat_43_sys_ftruncate_args *uap, register_t *retval) 234 { 235 /* { 236 syscallarg(int) fd; 237 syscallarg(long) length; 238 } */ 239 struct sys_ftruncate_args /* { 240 syscallarg(int) fd; 241 syscallarg(int) pad; 242 syscallarg(off_t) length; 243 } */ nuap; 244 245 SCARG(&nuap, fd) = SCARG(uap, fd); 246 SCARG(&nuap, length) = SCARG(uap, length); 247 return (sys_ftruncate(l, &nuap, retval)); 248 } 249 250 /* 251 * Truncate a file given its path name. 252 */ 253 /* ARGSUSED */ 254 int 255 compat_43_sys_truncate(struct lwp *l, const struct compat_43_sys_truncate_args *uap, register_t *retval) 256 { 257 /* { 258 syscallarg(char *) path; 259 syscallarg(long) length; 260 } */ 261 struct sys_truncate_args /* { 262 syscallarg(char *) path; 263 syscallarg(int) pad; 264 syscallarg(off_t) length; 265 } */ nuap; 266 267 SCARG(&nuap, path) = SCARG(uap, path); 268 SCARG(&nuap, length) = SCARG(uap, length); 269 return (sys_truncate(l, &nuap, retval)); 270 } 271 272 273 /* 274 * Reposition read/write file offset. 275 */ 276 int 277 compat_43_sys_lseek(struct lwp *l, const struct compat_43_sys_lseek_args *uap, register_t *retval) 278 { 279 /* { 280 syscallarg(int) fd; 281 syscallarg(long) offset; 282 syscallarg(int) whence; 283 } */ 284 struct sys_lseek_args /* { 285 syscallarg(int) fd; 286 syscallarg(int) pad; 287 syscallarg(off_t) offset; 288 syscallarg(int) whence; 289 } */ nuap; 290 off_t qret; 291 int error; 292 293 SCARG(&nuap, fd) = SCARG(uap, fd); 294 SCARG(&nuap, offset) = SCARG(uap, offset); 295 SCARG(&nuap, whence) = SCARG(uap, whence); 296 error = sys_lseek(l, &nuap, (void *)&qret); 297 *(long *)retval = qret; 298 return (error); 299 } 300 301 302 /* 303 * Create a file. 304 */ 305 int 306 compat_43_sys_creat(struct lwp *l, const struct compat_43_sys_creat_args *uap, register_t *retval) 307 { 308 /* { 309 syscallarg(char *) path; 310 syscallarg(int) mode; 311 } */ 312 struct sys_open_args /* { 313 syscallarg(char *) path; 314 syscallarg(int) flags; 315 syscallarg(int) mode; 316 } */ nuap; 317 318 SCARG(&nuap, path) = SCARG(uap, path); 319 SCARG(&nuap, mode) = SCARG(uap, mode); 320 SCARG(&nuap, flags) = O_WRONLY | O_CREAT | O_TRUNC; 321 return (sys_open(l, &nuap, retval)); 322 } 323 324 /*ARGSUSED*/ 325 int 326 compat_43_sys_quota(struct lwp *l, const void *v, register_t *retval) 327 { 328 329 return (ENOSYS); 330 } 331 332 333 /* 334 * Read a block of directory entries in a file system independent format. 335 */ 336 int 337 compat_43_sys_getdirentries(struct lwp *l, const struct compat_43_sys_getdirentries_args *uap, register_t *retval) 338 { 339 /* { 340 syscallarg(int) fd; 341 syscallarg(char *) buf; 342 syscallarg(u_int) count; 343 syscallarg(long *) basep; 344 } */ 345 struct vnode *vp; 346 struct file *fp; 347 struct uio auio, kuio; 348 struct iovec aiov, kiov; 349 struct dirent *dp, *edp; 350 char *dirbuf; 351 size_t count = min(MAXBSIZE, (size_t)SCARG(uap, count)); 352 353 int error, eofflag, readcnt; 354 long loff; 355 356 /* fd_getvnode() will use the descriptor for us */ 357 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 358 return (error); 359 if ((fp->f_flag & FREAD) == 0) { 360 error = EBADF; 361 goto out; 362 } 363 vp = (struct vnode *)fp->f_data; 364 unionread: 365 if (vp->v_type != VDIR) { 366 error = EINVAL; 367 goto out; 368 } 369 aiov.iov_base = SCARG(uap, buf); 370 aiov.iov_len = count; 371 auio.uio_iov = &aiov; 372 auio.uio_iovcnt = 1; 373 auio.uio_rw = UIO_READ; 374 auio.uio_resid = count; 375 KASSERT(l == curlwp); 376 auio.uio_vmspace = curproc->p_vmspace; 377 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 378 loff = auio.uio_offset = fp->f_offset; 379 # if (BYTE_ORDER != LITTLE_ENDIAN) 380 if ((vp->v_mount->mnt_iflag & IMNT_DTYPE) == 0) { 381 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, 382 (off_t **)0, (int *)0); 383 fp->f_offset = auio.uio_offset; 384 } else 385 # endif 386 { 387 kuio = auio; 388 kuio.uio_iov = &kiov; 389 kiov.iov_len = count; 390 dirbuf = malloc(count, M_TEMP, M_WAITOK); 391 kiov.iov_base = dirbuf; 392 UIO_SETUP_SYSSPACE(&kuio); 393 error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag, 394 (off_t **)0, (int *)0); 395 fp->f_offset = kuio.uio_offset; 396 if (error == 0) { 397 readcnt = count - kuio.uio_resid; 398 edp = (struct dirent *)&dirbuf[readcnt]; 399 for (dp = (struct dirent *)dirbuf; dp < edp; ) { 400 # if (BYTE_ORDER == LITTLE_ENDIAN) 401 /* 402 * The expected low byte of 403 * dp->d_namlen is our dp->d_type. 404 * The high MBZ byte of dp->d_namlen 405 * is our dp->d_namlen. 406 */ 407 dp->d_type = dp->d_namlen; 408 dp->d_namlen = 0; 409 # else 410 /* 411 * The dp->d_type is the high byte 412 * of the expected dp->d_namlen, 413 * so must be zero'ed. 414 */ 415 dp->d_type = 0; 416 # endif 417 if (dp->d_reclen > 0) { 418 dp = (struct dirent *) 419 ((char *)dp + dp->d_reclen); 420 } else { 421 error = EIO; 422 break; 423 } 424 } 425 if (dp >= edp) 426 error = uiomove(dirbuf, readcnt, &auio); 427 } 428 free(dirbuf, M_TEMP); 429 } 430 VOP_UNLOCK(vp, 0); 431 if (error) 432 goto out; 433 434 if ((count == auio.uio_resid) && 435 (vp->v_vflag & VV_ROOT) && 436 (vp->v_mount->mnt_flag & MNT_UNION)) { 437 struct vnode *tvp = vp; 438 vp = vp->v_mount->mnt_vnodecovered; 439 VREF(vp); 440 fp->f_data = (void *) vp; 441 fp->f_offset = 0; 442 vrele(tvp); 443 goto unionread; 444 } 445 error = copyout((void *)&loff, (void *)SCARG(uap, basep), 446 sizeof(long)); 447 *retval = count - auio.uio_resid; 448 out: 449 fd_putfile(SCARG(uap, fd)); 450 return (error); 451 } 452 453 /* 454 * sysctl helper routine for vfs.generic.conf lookups. 455 */ 456 #if defined(COMPAT_09) || defined(COMPAT_43) || defined(COMPAT_44) 457 static int 458 sysctl_vfs_generic_conf(SYSCTLFN_ARGS) 459 { 460 struct vfsconf vfc; 461 extern const char * const mountcompatnames[]; 462 extern int nmountcompatnames; 463 struct sysctlnode node; 464 struct vfsops *vfsp; 465 u_int vfsnum; 466 467 if (namelen != 1) 468 return (ENOTDIR); 469 vfsnum = name[0]; 470 if (vfsnum >= nmountcompatnames || 471 mountcompatnames[vfsnum] == NULL) 472 return (EOPNOTSUPP); 473 vfsp = vfs_getopsbyname(mountcompatnames[vfsnum]); 474 if (vfsp == NULL) 475 return (EOPNOTSUPP); 476 477 vfc.vfc_vfsops = vfsp; 478 strncpy(vfc.vfc_name, vfsp->vfs_name, sizeof(vfc.vfc_name)); 479 vfc.vfc_typenum = vfsnum; 480 vfc.vfc_refcount = vfsp->vfs_refcount; 481 vfc.vfc_flags = 0; 482 vfc.vfc_mountroot = vfsp->vfs_mountroot; 483 vfc.vfc_next = NULL; 484 vfs_delref(vfsp); 485 486 node = *rnode; 487 node.sysctl_data = &vfc; 488 return (sysctl_lookup(SYSCTLFN_CALL(&node))); 489 } 490 491 /* 492 * Top level filesystem related information gathering. 493 */ 494 SYSCTL_SETUP(compat_sysctl_vfs_setup, "compat sysctl vfs subtree setup") 495 { 496 extern int nmountcompatnames; 497 498 sysctl_createv(clog, 0, NULL, NULL, 499 CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE, 500 CTLTYPE_INT, "maxtypenum", 501 SYSCTL_DESCR("Highest valid filesystem type number"), 502 NULL, nmountcompatnames, NULL, 0, 503 CTL_VFS, VFS_GENERIC, VFS_MAXTYPENUM, CTL_EOL); 504 sysctl_createv(clog, 0, NULL, NULL, 505 CTLFLAG_PERMANENT, 506 CTLTYPE_STRUCT, "conf", 507 SYSCTL_DESCR("Filesystem configuration information"), 508 sysctl_vfs_generic_conf, 0, NULL, 509 sizeof(struct vfsconf), 510 CTL_VFS, VFS_GENERIC, VFS_CONF, CTL_EOL); 511 } 512 #endif
Cache object: 59e0db98d4df40dfa51ccf223a9641f2
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