xref: /netbsd-src/sys/compat/common/vfs_syscalls_43.c (revision aaf4ece63a859a04e37cf3a7229b5fab0157cc06) 
1 /*	$NetBSD: vfs_syscalls_43.c,v 1.31 2005/12/11 12:19:56 christos 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 1.31 2005/12/11 12:19:56 christos 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/sa.h>
68 #include <sys/syscallargs.h>
69 
70 #include <compat/sys/stat.h>
71 #include <compat/sys/mount.h>
72 
73 static void cvtstat __P((struct stat *, struct stat43 *));
74 
75 /*
76  * Convert from an old to a new stat structure.
77  */
78 static void
79 cvtstat(st, ost)
80 	struct stat *st;
81 	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, void *v, register_t *retval)
110 {
111 	struct compat_43_sys_stat_args /* {
112 		syscallarg(char *) path;
113 		syscallarg(struct stat43 *) ub;
114 	} */ *uap = v;
115 	struct stat sb;
116 	struct stat43 osb;
117 	int error;
118 	struct nameidata nd;
119 
120 	NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
121 	    SCARG(uap, path), l);
122 	if ((error = namei(&nd)) != 0)
123 		return (error);
124 	error = vn_stat(nd.ni_vp, &sb, l);
125 	vput(nd.ni_vp);
126 	if (error)
127 		return (error);
128 	cvtstat(&sb, &osb);
129 	error = copyout((caddr_t)&osb, (caddr_t)SCARG(uap, ub), sizeof (osb));
130 	return (error);
131 }
132 
133 /*
134  * Get file status; this version does not follow links.
135  */
136 /* ARGSUSED */
137 int
138 compat_43_sys_lstat(struct lwp *l, void *v, register_t *retval)
139 {
140 	struct compat_43_sys_lstat_args /* {
141 		syscallarg(char *) path;
142 		syscallarg(struct ostat *) ub;
143 	} */ *uap = v;
144 	struct vnode *vp, *dvp;
145 	struct stat sb, sb1;
146 	struct stat43 osb;
147 	int error;
148 	struct nameidata nd;
149 	int ndflags;
150 
151 	ndflags = NOFOLLOW | LOCKLEAF | LOCKPARENT;
152 again:
153 	NDINIT(&nd, LOOKUP, ndflags, UIO_USERSPACE, SCARG(uap, path), l);
154 	if ((error = namei(&nd))) {
155 		if (error == EISDIR && (ndflags & LOCKPARENT) != 0) {
156 			/*
157 			 * Should only happen on '/'. Retry without LOCKPARENT;
158 			 * this is safe since the vnode won't be a VLNK.
159 			 */
160 			ndflags &= ~LOCKPARENT;
161 			goto again;
162 		}
163 		return (error);
164 	}
165 	/*
166 	 * For symbolic links, always return the attributes of its
167 	 * containing directory, except for mode, size, and links.
168 	 */
169 	vp = nd.ni_vp;
170 	dvp = nd.ni_dvp;
171 	if (vp->v_type != VLNK) {
172 		if ((ndflags & LOCKPARENT) != 0) {
173 			if (dvp == vp)
174 				vrele(dvp);
175 			else
176 				vput(dvp);
177 		}
178 		error = vn_stat(vp, &sb, l);
179 		vput(vp);
180 		if (error)
181 			return (error);
182 	} else {
183 		error = vn_stat(dvp, &sb, l);
184 		vput(dvp);
185 		if (error) {
186 			vput(vp);
187 			return (error);
188 		}
189 		error = vn_stat(vp, &sb1, l);
190 		vput(vp);
191 		if (error)
192 			return (error);
193 		sb.st_mode &= ~S_IFDIR;
194 		sb.st_mode |= S_IFLNK;
195 		sb.st_nlink = sb1.st_nlink;
196 		sb.st_size = sb1.st_size;
197 		sb.st_blocks = sb1.st_blocks;
198 	}
199 	cvtstat(&sb, &osb);
200 	error = copyout((caddr_t)&osb, (caddr_t)SCARG(uap, ub), sizeof (osb));
201 	return (error);
202 }
203 
204 /*
205  * Return status information about a file descriptor.
206  */
207 /* ARGSUSED */
208 int
209 compat_43_sys_fstat(struct lwp *l, void *v, register_t *retval)
210 {
211 	struct compat_43_sys_fstat_args /* {
212 		syscallarg(int) fd;
213 		syscallarg(struct stat43 *) sb;
214 	} */ *uap = v;
215 	struct proc *p = l->l_proc;
216 	int fd = SCARG(uap, fd);
217 	struct filedesc *fdp = p->p_fd;
218 	struct file *fp;
219 	struct stat ub;
220 	struct stat43 oub;
221 	int error;
222 
223 	if ((fp = fd_getfile(fdp, fd)) == NULL)
224 		return (EBADF);
225 
226 	FILE_USE(fp);
227 	error = (*fp->f_ops->fo_stat)(fp, &ub, l);
228 	FILE_UNUSE(fp, l);
229 
230 	if (error == 0) {
231 		cvtstat(&ub, &oub);
232 		error = copyout((caddr_t)&oub, (caddr_t)SCARG(uap, sb),
233 		    sizeof (oub));
234 	}
235 
236 
237 	return (error);
238 }
239 
240 
241 /*
242  * Truncate a file given a file descriptor.
243  */
244 /* ARGSUSED */
245 int
246 compat_43_sys_ftruncate(struct lwp *l, void *v, register_t *retval)
247 {
248 	struct compat_43_sys_ftruncate_args /* {
249 		syscallarg(int) fd;
250 		syscallarg(long) length;
251 	} */ *uap = v;
252 	struct sys_ftruncate_args /* {
253 		syscallarg(int) fd;
254 		syscallarg(int) pad;
255 		syscallarg(off_t) length;
256 	} */ nuap;
257 
258 	SCARG(&nuap, fd) = SCARG(uap, fd);
259 	SCARG(&nuap, length) = SCARG(uap, length);
260 	return (sys_ftruncate(l, &nuap, retval));
261 }
262 
263 /*
264  * Truncate a file given its path name.
265  */
266 /* ARGSUSED */
267 int
268 compat_43_sys_truncate(struct lwp *l, void *v, register_t *retval)
269 {
270 	struct compat_43_sys_truncate_args /* {
271 		syscallarg(char *) path;
272 		syscallarg(long) length;
273 	} */ *uap = v;
274 	struct sys_truncate_args /* {
275 		syscallarg(char *) path;
276 		syscallarg(int) pad;
277 		syscallarg(off_t) length;
278 	} */ nuap;
279 
280 	SCARG(&nuap, path) = SCARG(uap, path);
281 	SCARG(&nuap, length) = SCARG(uap, length);
282 	return (sys_truncate(l, &nuap, retval));
283 }
284 
285 
286 /*
287  * Reposition read/write file offset.
288  */
289 int
290 compat_43_sys_lseek(struct lwp *l, void *v, register_t *retval)
291 {
292 	struct compat_43_sys_lseek_args /* {
293 		syscallarg(int) fd;
294 		syscallarg(long) offset;
295 		syscallarg(int) whence;
296 	} */ *uap = v;
297 	struct sys_lseek_args /* {
298 		syscallarg(int) fd;
299 		syscallarg(int) pad;
300 		syscallarg(off_t) offset;
301 		syscallarg(int) whence;
302 	} */ nuap;
303 	off_t qret;
304 	int error;
305 
306 	SCARG(&nuap, fd) = SCARG(uap, fd);
307 	SCARG(&nuap, offset) = SCARG(uap, offset);
308 	SCARG(&nuap, whence) = SCARG(uap, whence);
309 	error = sys_lseek(l, &nuap, (void *)&qret);
310 	*(long *)retval = qret;
311 	return (error);
312 }
313 
314 
315 /*
316  * Create a file.
317  */
318 int
319 compat_43_sys_creat(struct lwp *l, void *v, register_t *retval)
320 {
321 	struct compat_43_sys_creat_args /* {
322 		syscallarg(char *) path;
323 		syscallarg(int) mode;
324 	} */ *uap = v;
325 	struct sys_open_args /* {
326 		syscallarg(char *) path;
327 		syscallarg(int) flags;
328 		syscallarg(int) mode;
329 	} */ nuap;
330 
331 	SCARG(&nuap, path) = SCARG(uap, path);
332 	SCARG(&nuap, mode) = SCARG(uap, mode);
333 	SCARG(&nuap, flags) = O_WRONLY | O_CREAT | O_TRUNC;
334 	return (sys_open(l, &nuap, retval));
335 }
336 
337 /*ARGSUSED*/
338 int
339 compat_43_sys_quota(struct lwp *l, void *v, register_t *retval)
340 {
341 
342 	return (ENOSYS);
343 }
344 
345 
346 /*
347  * Read a block of directory entries in a file system independent format.
348  */
349 int
350 compat_43_sys_getdirentries(struct lwp *l, void *v, register_t *retval)
351 {
352 	struct compat_43_sys_getdirentries_args /* {
353 		syscallarg(int) fd;
354 		syscallarg(char *) buf;
355 		syscallarg(u_int) count;
356 		syscallarg(long *) basep;
357 	} */ *uap = v;
358 	struct proc *p = l->l_proc;
359 	struct vnode *vp;
360 	struct file *fp;
361 	struct uio auio, kuio;
362 	struct iovec aiov, kiov;
363 	struct dirent *dp, *edp;
364 	caddr_t dirbuf;
365 	size_t count = min(MAXBSIZE, (size_t)SCARG(uap, count));
366 
367 	int error, eofflag, readcnt;
368 	long loff;
369 
370 	/* getvnode() will use the descriptor for us */
371 	if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
372 		return (error);
373 	if ((fp->f_flag & FREAD) == 0) {
374 		error = EBADF;
375 		goto out;
376 	}
377 	vp = (struct vnode *)fp->f_data;
378 unionread:
379 	if (vp->v_type != VDIR) {
380 		error = EINVAL;
381 		goto out;
382 	}
383 	aiov.iov_base = SCARG(uap, buf);
384 	aiov.iov_len = count;
385 	auio.uio_iov = &aiov;
386 	auio.uio_iovcnt = 1;
387 	auio.uio_rw = UIO_READ;
388 	auio.uio_segflg = UIO_USERSPACE;
389 	auio.uio_lwp = l;
390 	auio.uio_resid = count;
391 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
392 	loff = auio.uio_offset = fp->f_offset;
393 #	if (BYTE_ORDER != LITTLE_ENDIAN)
394 		if ((vp->v_mount->mnt_iflag & IMNT_DTYPE) == 0) {
395 			error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag,
396 			    (off_t **)0, (int *)0);
397 			fp->f_offset = auio.uio_offset;
398 		} else
399 #	endif
400 	{
401 		kuio = auio;
402 		kuio.uio_iov = &kiov;
403 		kuio.uio_segflg = UIO_SYSSPACE;
404 		kiov.iov_len = count;
405 		dirbuf = malloc(count, M_TEMP, M_WAITOK);
406 		kiov.iov_base = dirbuf;
407 		error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag,
408 			    (off_t **)0, (int *)0);
409 		fp->f_offset = kuio.uio_offset;
410 		if (error == 0) {
411 			readcnt = count - kuio.uio_resid;
412 			edp = (struct dirent *)&dirbuf[readcnt];
413 			for (dp = (struct dirent *)dirbuf; dp < edp; ) {
414 #				if (BYTE_ORDER == LITTLE_ENDIAN)
415 					/*
416 					 * The expected low byte of
417 					 * dp->d_namlen is our dp->d_type.
418 					 * The high MBZ byte of dp->d_namlen
419 					 * is our dp->d_namlen.
420 					 */
421 					dp->d_type = dp->d_namlen;
422 					dp->d_namlen = 0;
423 #				else
424 					/*
425 					 * The dp->d_type is the high byte
426 					 * of the expected dp->d_namlen,
427 					 * so must be zero'ed.
428 					 */
429 					dp->d_type = 0;
430 #				endif
431 				if (dp->d_reclen > 0) {
432 					dp = (struct dirent *)
433 					    ((char *)dp + dp->d_reclen);
434 				} else {
435 					error = EIO;
436 					break;
437 				}
438 			}
439 			if (dp >= edp)
440 				error = uiomove(dirbuf, readcnt, &auio);
441 		}
442 		free(dirbuf, M_TEMP);
443 	}
444 	VOP_UNLOCK(vp, 0);
445 	if (error)
446 		goto out;
447 
448 #ifdef UNION
449 {
450 	extern int (**union_vnodeop_p) __P((void *));
451 	extern struct vnode *union_dircache __P((struct vnode *));
452 
453 	if ((count == auio.uio_resid) &&
454 	    (vp->v_op == union_vnodeop_p)) {
455 		struct vnode *lvp;
456 
457 		lvp = union_dircache(vp);
458 		if (lvp != NULLVP) {
459 			struct vattr va;
460 
461 			/*
462 			 * If the directory is opaque,
463 			 * then don't show lower entries
464 			 */
465 			error = VOP_GETATTR(vp, &va, fp->f_cred, l);
466 			if (va.va_flags & OPAQUE) {
467 				vput(lvp);
468 				lvp = NULL;
469 			}
470 		}
471 
472 		if (lvp != NULLVP) {
473 			error = VOP_OPEN(lvp, FREAD, fp->f_cred, l);
474 			VOP_UNLOCK(lvp, 0);
475 
476 			if (error) {
477 				vrele(lvp);
478 				goto out;
479 			}
480 			fp->f_data = (caddr_t) lvp;
481 			fp->f_offset = 0;
482 			error = vn_close(vp, FREAD, fp->f_cred, l);
483 			if (error)
484 				goto out;
485 			vp = lvp;
486 			goto unionread;
487 		}
488 	}
489 }
490 #endif /* UNION */
491 
492 	if ((count == auio.uio_resid) &&
493 	    (vp->v_flag & VROOT) &&
494 	    (vp->v_mount->mnt_flag & MNT_UNION)) {
495 		struct vnode *tvp = vp;
496 		vp = vp->v_mount->mnt_vnodecovered;
497 		VREF(vp);
498 		fp->f_data = (caddr_t) vp;
499 		fp->f_offset = 0;
500 		vrele(tvp);
501 		goto unionread;
502 	}
503 	error = copyout((caddr_t)&loff, (caddr_t)SCARG(uap, basep),
504 	    sizeof(long));
505 	*retval = count - auio.uio_resid;
506  out:
507 	FILE_UNUSE(fp, l);
508 	return (error);
509 }
510 
511 /*
512  * sysctl helper routine for vfs.generic.conf lookups.
513  */
514 #if defined(COMPAT_09) || defined(COMPAT_43) || defined(COMPAT_44)
515 static int
516 sysctl_vfs_generic_conf(SYSCTLFN_ARGS)
517 {
518         struct vfsconf vfc;
519         extern const char * const mountcompatnames[];
520         extern int nmountcompatnames;
521 	struct sysctlnode node;
522 	struct vfsops *vfsp;
523 	u_int vfsnum;
524 
525 	if (namelen != 1)
526 		return (ENOTDIR);
527 	vfsnum = name[0];
528 	if (vfsnum >= nmountcompatnames ||
529 	    mountcompatnames[vfsnum] == NULL)
530 		return (EOPNOTSUPP);
531 	vfsp = vfs_getopsbyname(mountcompatnames[vfsnum]);
532 	if (vfsp == NULL)
533 		return (EOPNOTSUPP);
534 
535 	vfc.vfc_vfsops = vfsp;
536 	strncpy(vfc.vfc_name, vfsp->vfs_name, MFSNAMELEN);
537 	vfc.vfc_typenum = vfsnum;
538 	vfc.vfc_refcount = vfsp->vfs_refcount;
539 	vfc.vfc_flags = 0;
540 	vfc.vfc_mountroot = vfsp->vfs_mountroot;
541 	vfc.vfc_next = NULL;
542 
543 	node = *rnode;
544 	node.sysctl_data = &vfc;
545 	return (sysctl_lookup(SYSCTLFN_CALL(&node)));
546 }
547 
548 /*
549  * Top level filesystem related information gathering.
550  */
551 SYSCTL_SETUP(compat_sysctl_vfs_setup, "compat sysctl vfs subtree setup")
552 {
553 	extern int nmountcompatnames;
554 
555 	sysctl_createv(clog, 0, NULL, NULL,
556 		       CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
557 		       CTLTYPE_INT, "maxtypenum",
558 		       SYSCTL_DESCR("Highest valid filesystem type number"),
559 		       NULL, nmountcompatnames, NULL, 0,
560 		       CTL_VFS, VFS_GENERIC, VFS_MAXTYPENUM, CTL_EOL);
561 	sysctl_createv(clog, 0, NULL, NULL,
562 		       CTLFLAG_PERMANENT,
563 		       CTLTYPE_STRUCT, "conf",
564 		       SYSCTL_DESCR("Filesystem configuration information"),
565 		       sysctl_vfs_generic_conf, 0, NULL,
566 		       sizeof(struct vfsconf),
567 		       CTL_VFS, VFS_GENERIC, VFS_CONF, CTL_EOL);
568 }
569 #endif
570