xref: /titanic_50/usr/src/uts/common/syscall/pathconf.c (revision da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0)
17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate  * CDDL HEADER START
37c478bd9Sstevel@tonic-gate  *
47c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5dd29fa4aSprabahar  * Common Development and Distribution License (the "License").
6dd29fa4aSprabahar  * You may not use this file except in compliance with the License.
77c478bd9Sstevel@tonic-gate  *
87c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
97c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
107c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
117c478bd9Sstevel@tonic-gate  * and limitations under the License.
127c478bd9Sstevel@tonic-gate  *
137c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
147c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
157c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
167c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
177c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
187c478bd9Sstevel@tonic-gate  *
197c478bd9Sstevel@tonic-gate  * CDDL HEADER END
207c478bd9Sstevel@tonic-gate  */
217c478bd9Sstevel@tonic-gate /*
22*da6c28aaSamw  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
237c478bd9Sstevel@tonic-gate  * Use is subject to license terms.
247c478bd9Sstevel@tonic-gate  */
257c478bd9Sstevel@tonic-gate 
267c478bd9Sstevel@tonic-gate /*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
277c478bd9Sstevel@tonic-gate /*	  All Rights Reserved  	*/
287c478bd9Sstevel@tonic-gate 
297c478bd9Sstevel@tonic-gate /*
307c478bd9Sstevel@tonic-gate  * Portions of this source code were derived from Berkeley 4.3 BSD
317c478bd9Sstevel@tonic-gate  * under license from the Regents of the University of California.
327c478bd9Sstevel@tonic-gate  */
337c478bd9Sstevel@tonic-gate 
347c478bd9Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"
357c478bd9Sstevel@tonic-gate 
367c478bd9Sstevel@tonic-gate #include <sys/param.h>
377c478bd9Sstevel@tonic-gate #include <sys/isa_defs.h>
387c478bd9Sstevel@tonic-gate #include <sys/types.h>
397c478bd9Sstevel@tonic-gate #include <sys/sysmacros.h>
407c478bd9Sstevel@tonic-gate #include <sys/cred.h>
417c478bd9Sstevel@tonic-gate #include <sys/systm.h>
427c478bd9Sstevel@tonic-gate #include <sys/errno.h>
437c478bd9Sstevel@tonic-gate #include <sys/pathname.h>
447c478bd9Sstevel@tonic-gate #include <sys/vnode.h>
457c478bd9Sstevel@tonic-gate #include <sys/vfs.h>
467c478bd9Sstevel@tonic-gate #include <sys/file.h>
477c478bd9Sstevel@tonic-gate #include <sys/uio.h>
487c478bd9Sstevel@tonic-gate #include <sys/debug.h>
49dd29fa4aSprabahar #include <fs/fs_subr.h>
507c478bd9Sstevel@tonic-gate 
517c478bd9Sstevel@tonic-gate /*
527c478bd9Sstevel@tonic-gate  * Common code for pathconf(), fpathconf() system calls
537c478bd9Sstevel@tonic-gate  */
547c478bd9Sstevel@tonic-gate static long
557c478bd9Sstevel@tonic-gate cpathconf(register vnode_t *vp, int cmd, struct cred *cr)
567c478bd9Sstevel@tonic-gate {
577c478bd9Sstevel@tonic-gate 	int error;
587c478bd9Sstevel@tonic-gate 	ulong_t val;
597c478bd9Sstevel@tonic-gate 
607c478bd9Sstevel@tonic-gate 	switch (cmd) {
617c478bd9Sstevel@tonic-gate 	case _PC_2_SYMLINKS:
62*da6c28aaSamw 		if (error = VOP_PATHCONF(vp, _PC_SYMLINK_MAX, &val, cr, NULL))
637c478bd9Sstevel@tonic-gate 			return ((long)set_errno(error));
647c478bd9Sstevel@tonic-gate 		return ((long)(val > 0));
657c478bd9Sstevel@tonic-gate 
667c478bd9Sstevel@tonic-gate 	case _PC_ALLOC_SIZE_MIN:
677c478bd9Sstevel@tonic-gate 	case _PC_REC_INCR_XFER_SIZE:
687c478bd9Sstevel@tonic-gate 	case _PC_REC_MAX_XFER_SIZE:
697c478bd9Sstevel@tonic-gate 	case _PC_REC_MIN_XFER_SIZE:
707c478bd9Sstevel@tonic-gate 	case _PC_REC_XFER_ALIGN:
717c478bd9Sstevel@tonic-gate 		return ((long)set_errno(EINVAL));
727c478bd9Sstevel@tonic-gate 
737c478bd9Sstevel@tonic-gate 	case _PC_ASYNC_IO:
747c478bd9Sstevel@tonic-gate 		return (1l);
757c478bd9Sstevel@tonic-gate 
767c478bd9Sstevel@tonic-gate 	case _PC_PRIO_IO:
777c478bd9Sstevel@tonic-gate 		return ((long)set_errno(EINVAL));
787c478bd9Sstevel@tonic-gate 
797c478bd9Sstevel@tonic-gate 	case _PC_SYNC_IO:
80*da6c28aaSamw 		if (!(error = VOP_FSYNC(vp, FSYNC, cr, NULL)))
817c478bd9Sstevel@tonic-gate 			return (1l);
827c478bd9Sstevel@tonic-gate 		return ((long)set_errno(error));
837c478bd9Sstevel@tonic-gate 
847c478bd9Sstevel@tonic-gate 	case _PC_XATTR_ENABLED:
857c478bd9Sstevel@tonic-gate 		return ((vp->v_vfsp->vfs_flag & VFS_XATTR) ? 1 : 0);
867c478bd9Sstevel@tonic-gate 
877c478bd9Sstevel@tonic-gate 	default:
88*da6c28aaSamw 		if (error = VOP_PATHCONF(vp, cmd, &val, cr, NULL))
897c478bd9Sstevel@tonic-gate 			return ((long)set_errno(error));
907c478bd9Sstevel@tonic-gate 		return (val);
917c478bd9Sstevel@tonic-gate 	}
927c478bd9Sstevel@tonic-gate 	/* NOTREACHED */
937c478bd9Sstevel@tonic-gate }
947c478bd9Sstevel@tonic-gate 
957c478bd9Sstevel@tonic-gate /* fpathconf/pathconf interfaces */
967c478bd9Sstevel@tonic-gate 
977c478bd9Sstevel@tonic-gate long
987c478bd9Sstevel@tonic-gate fpathconf(int fdes, int name)
997c478bd9Sstevel@tonic-gate {
1007c478bd9Sstevel@tonic-gate 	file_t *fp;
1017c478bd9Sstevel@tonic-gate 	long retval;
1027c478bd9Sstevel@tonic-gate 
1037c478bd9Sstevel@tonic-gate 	if ((fp = getf(fdes)) == NULL)
1047c478bd9Sstevel@tonic-gate 		return (set_errno(EBADF));
1057c478bd9Sstevel@tonic-gate 	retval = cpathconf(fp->f_vnode, name, fp->f_cred);
1067c478bd9Sstevel@tonic-gate 	releasef(fdes);
1077c478bd9Sstevel@tonic-gate 	return (retval);
1087c478bd9Sstevel@tonic-gate }
1097c478bd9Sstevel@tonic-gate 
1107c478bd9Sstevel@tonic-gate long
1117c478bd9Sstevel@tonic-gate pathconf(char *fname, int name)
1127c478bd9Sstevel@tonic-gate {
1137c478bd9Sstevel@tonic-gate 	vnode_t *vp;
1147c478bd9Sstevel@tonic-gate 	long	retval;
1157c478bd9Sstevel@tonic-gate 	int	error;
116dd29fa4aSprabahar 	int 	estale_retry = 0;
1177c478bd9Sstevel@tonic-gate 
1187c478bd9Sstevel@tonic-gate lookup:
1197c478bd9Sstevel@tonic-gate 	if (error = lookupname(fname, UIO_USERSPACE, FOLLOW, NULLVPP, &vp)) {
120dd29fa4aSprabahar 		if ((error == ESTALE) && fs_need_estale_retry(estale_retry++))
1217c478bd9Sstevel@tonic-gate 			goto lookup;
1227c478bd9Sstevel@tonic-gate 		return ((long)set_errno(error));
1237c478bd9Sstevel@tonic-gate 	}
1247c478bd9Sstevel@tonic-gate 
1257c478bd9Sstevel@tonic-gate 	retval = cpathconf(vp, name, CRED());
1267c478bd9Sstevel@tonic-gate 	VN_RELE(vp);
1277c478bd9Sstevel@tonic-gate 	return (retval);
1287c478bd9Sstevel@tonic-gate }
129