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 #include <sys/param.h>
3358f0484fSRodney W. Grimes #include <sys/ucred.h>
3458f0484fSRodney W. Grimes #include <sys/mount.h>
3558f0484fSRodney W. Grimes #include <stdlib.h>
3658f0484fSRodney W. Grimes
375a28df2eSConrad Meyer #define MAX_TRIES 3
385a28df2eSConrad Meyer #define SCALING_FACTOR 2
395a28df2eSConrad Meyer
4058f0484fSRodney W. Grimes /*
4158f0484fSRodney W. Grimes * Return information about mounted filesystems.
4258f0484fSRodney W. Grimes */
4358f0484fSRodney W. Grimes int
getmntinfo(struct statfs ** mntbufp,int mode)4434ed0c63SJohn Baldwin getmntinfo(struct statfs **mntbufp, int mode)
4558f0484fSRodney W. Grimes {
4658f0484fSRodney W. Grimes static struct statfs *mntbuf;
4758f0484fSRodney W. Grimes static int mntsize;
4858f0484fSRodney W. Grimes static long bufsize;
495a28df2eSConrad Meyer unsigned tries = 0;
5058f0484fSRodney W. Grimes
5158f0484fSRodney W. Grimes if (mntsize <= 0 && (mntsize = getfsstat(0, 0, MNT_NOWAIT)) < 0)
5258f0484fSRodney W. Grimes return (0);
5334ed0c63SJohn Baldwin if (bufsize > 0 && (mntsize = getfsstat(mntbuf, bufsize, mode)) < 0)
5458f0484fSRodney W. Grimes return (0);
555a28df2eSConrad Meyer while (tries++ < MAX_TRIES && bufsize <= mntsize * sizeof(*mntbuf)) {
565a28df2eSConrad Meyer bufsize = (mntsize * SCALING_FACTOR) * sizeof(*mntbuf);
575a28df2eSConrad Meyer if ((mntbuf = reallocf(mntbuf, bufsize)) == NULL)
5858f0484fSRodney W. Grimes return (0);
5934ed0c63SJohn Baldwin if ((mntsize = getfsstat(mntbuf, bufsize, mode)) < 0)
6058f0484fSRodney W. Grimes return (0);
6158f0484fSRodney W. Grimes }
6258f0484fSRodney W. Grimes *mntbufp = mntbuf;
635a28df2eSConrad Meyer if (mntsize > (bufsize / sizeof(*mntbuf)))
645a28df2eSConrad Meyer return (bufsize / sizeof(*mntbuf));
6558f0484fSRodney W. Grimes return (mntsize);
6658f0484fSRodney W. Grimes }
67