1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __SCCSID("@(#)kvm_getvfsbyname.c 8.1 (Berkeley) 4/3/95"); 34 #include <sys/param.h> 35 #include <sys/mount.h> 36 #include <sys/sysctl.h> 37 #include <errno.h> 38 #include <stdbool.h> 39 #include <stdlib.h> 40 #include <string.h> 41 42 /* 43 * fusefs(5) file systems may have a "subtype" which gets appended to 44 * statfs(2)'s f_fstypename field on a per-mount basis. Allow getvfsbyname to 45 * match either the full "fusefs.foobar" or the more general "fusefs". 46 */ 47 static bool 48 are_fusefs(const char *fsname, const char *vfc_name) 49 { 50 const static char fusefs[] = "fusefs"; 51 const static char fusefs_dot[] = "fusefs."; 52 53 return (strncmp(fsname, fusefs_dot, sizeof(fusefs_dot) - 1) == 0 && 54 strcmp(fusefs, vfc_name) == 0); 55 } 56 57 /* 58 * Given a filesystem name, determine if it is resident in the kernel, 59 * and if it is resident, return its xvfsconf structure. 60 */ 61 int 62 getvfsbyname(const char *fsname, struct xvfsconf *vfcp) 63 { 64 struct xvfsconf *xvfsp; 65 size_t buflen; 66 int cnt, i; 67 68 if (sysctlbyname("vfs.conflist", NULL, &buflen, NULL, 0) < 0) 69 return (-1); 70 xvfsp = malloc(buflen); 71 if (xvfsp == NULL) 72 return (-1); 73 if (sysctlbyname("vfs.conflist", xvfsp, &buflen, NULL, 0) < 0) { 74 free(xvfsp); 75 return (-1); 76 } 77 cnt = buflen / sizeof(struct xvfsconf); 78 for (i = 0; i < cnt; i++) { 79 if (strcmp(fsname, xvfsp[i].vfc_name) == 0 || 80 are_fusefs(fsname, xvfsp[i].vfc_name)) { 81 memcpy(vfcp, xvfsp + i, sizeof(struct xvfsconf)); 82 free(xvfsp); 83 return (0); 84 } 85 } 86 free(xvfsp); 87 errno = ENOENT; 88 return (-1); 89 } 90