1*8a16b7a1SPedro F. Giffuni /*- 2*8a16b7a1SPedro F. Giffuni * SPDX-License-Identifier: BSD-3-Clause 3*8a16b7a1SPedro F. Giffuni * 458f0484fSRodney W. Grimes * Copyright (c) 1989, 1993 558f0484fSRodney W. Grimes * The Regents of the University of California. All rights reserved. 658f0484fSRodney W. Grimes * 758f0484fSRodney W. Grimes * Redistribution and use in source and binary forms, with or without 858f0484fSRodney W. Grimes * modification, are permitted provided that the following conditions 958f0484fSRodney W. Grimes * are met: 1058f0484fSRodney W. Grimes * 1. Redistributions of source code must retain the above copyright 1158f0484fSRodney W. Grimes * notice, this list of conditions and the following disclaimer. 1258f0484fSRodney W. Grimes * 2. Redistributions in binary form must reproduce the above copyright 1358f0484fSRodney W. Grimes * notice, this list of conditions and the following disclaimer in the 1458f0484fSRodney W. Grimes * documentation and/or other materials provided with the distribution. 15fbbd9655SWarner Losh * 3. Neither the name of the University nor the names of its contributors 1658f0484fSRodney W. Grimes * may be used to endorse or promote products derived from this software 1758f0484fSRodney W. Grimes * without specific prior written permission. 1858f0484fSRodney W. Grimes * 1958f0484fSRodney W. Grimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2058f0484fSRodney W. Grimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2158f0484fSRodney W. Grimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2258f0484fSRodney W. Grimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2358f0484fSRodney W. Grimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2458f0484fSRodney W. Grimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2558f0484fSRodney W. Grimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2658f0484fSRodney W. Grimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2758f0484fSRodney W. Grimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2858f0484fSRodney W. Grimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2958f0484fSRodney W. Grimes * SUCH DAMAGE. 3058f0484fSRodney W. Grimes */ 3158f0484fSRodney W. Grimes 3258f0484fSRodney W. Grimes #if defined(LIBC_SCCS) && !defined(lint) 3358f0484fSRodney W. Grimes static char sccsid[] = "@(#)getmntinfo.c 8.1 (Berkeley) 6/4/93"; 3458f0484fSRodney W. Grimes #endif /* LIBC_SCCS and not lint */ 35ea8d448aSDavid E. O'Brien #include <sys/cdefs.h> 36ea8d448aSDavid E. O'Brien __FBSDID("$FreeBSD$"); 3758f0484fSRodney W. Grimes 3858f0484fSRodney W. Grimes #include <sys/param.h> 3958f0484fSRodney W. Grimes #include <sys/ucred.h> 4058f0484fSRodney W. Grimes #include <sys/mount.h> 4158f0484fSRodney W. Grimes #include <stdlib.h> 4258f0484fSRodney W. Grimes 435a28df2eSConrad Meyer #define MAX_TRIES 3 445a28df2eSConrad Meyer #define SCALING_FACTOR 2 455a28df2eSConrad Meyer 4658f0484fSRodney W. Grimes /* 4758f0484fSRodney W. Grimes * Return information about mounted filesystems. 4858f0484fSRodney W. Grimes */ 4958f0484fSRodney W. Grimes int 5034ed0c63SJohn Baldwin getmntinfo(struct statfs **mntbufp, int mode) 5158f0484fSRodney W. Grimes { 5258f0484fSRodney W. Grimes static struct statfs *mntbuf; 5358f0484fSRodney W. Grimes static int mntsize; 5458f0484fSRodney W. Grimes static long bufsize; 555a28df2eSConrad Meyer unsigned tries = 0; 5658f0484fSRodney W. Grimes 5758f0484fSRodney W. Grimes if (mntsize <= 0 && (mntsize = getfsstat(0, 0, MNT_NOWAIT)) < 0) 5858f0484fSRodney W. Grimes return (0); 5934ed0c63SJohn Baldwin if (bufsize > 0 && (mntsize = getfsstat(mntbuf, bufsize, mode)) < 0) 6058f0484fSRodney W. Grimes return (0); 615a28df2eSConrad Meyer while (tries++ < MAX_TRIES && bufsize <= mntsize * sizeof(*mntbuf)) { 625a28df2eSConrad Meyer bufsize = (mntsize * SCALING_FACTOR) * sizeof(*mntbuf); 635a28df2eSConrad Meyer if ((mntbuf = reallocf(mntbuf, bufsize)) == NULL) 6458f0484fSRodney W. Grimes return (0); 6534ed0c63SJohn Baldwin if ((mntsize = getfsstat(mntbuf, bufsize, mode)) < 0) 6658f0484fSRodney W. Grimes return (0); 6758f0484fSRodney W. Grimes } 6858f0484fSRodney W. Grimes *mntbufp = mntbuf; 695a28df2eSConrad Meyer if (mntsize > (bufsize / sizeof(*mntbuf))) 705a28df2eSConrad Meyer return (bufsize / sizeof(*mntbuf)); 7158f0484fSRodney W. Grimes return (mntsize); 7258f0484fSRodney W. Grimes } 73