92 lines
3.1 KiB
C
92 lines
3.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1995
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__SCCSID("@(#)kvm_getvfsbyname.c 8.1 (Berkeley) 4/3/95");
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/mount.h>
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#include <sys/sysctl.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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/*
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* fusefs(5) file systems may have a "subtype" which gets appended to
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* statfs(2)'s f_fstypename field on a per-mount basis. Allow getvfsbyname to
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* match either the full "fusefs.foobar" or the more general "fusefs".
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*/
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static bool
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are_fusefs(const char *fsname, const char *vfc_name)
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{
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const static char fusefs[] = "fusefs";
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const static char fusefs_dot[] = "fusefs.";
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return (strncmp(fsname, fusefs_dot, sizeof(fusefs_dot) - 1) == 0 &&
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strcmp(fusefs, vfc_name) == 0);
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}
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/*
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* Given a filesystem name, determine if it is resident in the kernel,
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* and if it is resident, return its xvfsconf structure.
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*/
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int
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getvfsbyname(const char *fsname, struct xvfsconf *vfcp)
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{
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struct xvfsconf *xvfsp;
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size_t buflen;
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int cnt, i;
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if (sysctlbyname("vfs.conflist", NULL, &buflen, NULL, 0) < 0)
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return (-1);
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xvfsp = malloc(buflen);
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if (xvfsp == NULL)
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return (-1);
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if (sysctlbyname("vfs.conflist", xvfsp, &buflen, NULL, 0) < 0) {
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free(xvfsp);
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return (-1);
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}
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cnt = buflen / sizeof(struct xvfsconf);
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for (i = 0; i < cnt; i++) {
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if (strcmp(fsname, xvfsp[i].vfc_name) == 0 ||
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are_fusefs(fsname, xvfsp[i].vfc_name)) {
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memcpy(vfcp, xvfsp + i, sizeof(struct xvfsconf));
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free(xvfsp);
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return (0);
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}
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}
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free(xvfsp);
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errno = ENOENT;
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return (-1);
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}
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