148 lines
4.0 KiB
C
148 lines
4.0 KiB
C
/* $NetBSD: getfsspecname.c,v 1.3 2012/04/08 20:56:12 christos Exp $ */
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/*-
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* Copyright (c) 2012 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: getfsspecname.c,v 1.3 2012/04/08 20:56:12 christos Exp $");
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#include <sys/disk.h>
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#include <stdio.h>
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#include <vis.h>
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#include <string.h>
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#include <fstab.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <unistd.h>
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#include <util.h>
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#define COMPAT_DKWEDGE /* To be removed */
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const char *
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getfsspecname(char *buf, size_t bufsiz, const char *name)
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{
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static const int mib[] = { CTL_HW, HW_DISKNAMES };
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static const unsigned int miblen = __arraycount(mib);
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char *drives, *dk;
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size_t len;
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int fd, savee;
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char *vname;
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drives = NULL;
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vname = NULL;
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if (strncasecmp(name, "NAME=", 5) != 0) {
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#ifdef COMPAT_DKWEDGE
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/*
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* We try to open the disk name, and if we fail with EBUSY
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* we use the name as the label to find the wedge.
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*/
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char rbuf[MAXPATHLEN];
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if (name[0] == '/') {
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if (getdiskrawname(rbuf, sizeof(rbuf), name) != NULL) {
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if ((fd = open(rbuf, O_RDONLY)) == -1) {
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if (errno == EBUSY) {
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name = strrchr(name, '/') + 1;
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goto search;
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}
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} else
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close(fd);
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}
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}
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#endif
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strlcpy(buf, name, bufsiz);
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return buf;
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} else
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name += 5;
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#ifdef COMPAT_DKWEDGE
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search:
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#endif
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vname = malloc(strlen(name) * 4 + 1);
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if (vname == NULL) {
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savee = errno;
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strlcpy(buf, "malloc failed", bufsiz);
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goto out;
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}
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strunvis(vname, name);
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if (sysctl(mib, miblen, NULL, &len, NULL, 0) == -1) {
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savee = errno;
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strlcpy(buf, "sysctl hw.disknames failed", bufsiz);
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goto out;
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}
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drives = malloc(len);
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if (drives == NULL) {
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savee = errno;
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strlcpy(buf, "malloc failed", bufsiz);
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goto out;
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}
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if (sysctl(mib, miblen, drives, &len, NULL, 0) == -1) {
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savee = errno;
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strlcpy(buf, "sysctl hw.disknames failed", bufsiz);
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goto out;
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}
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for (dk = strtok(drives, " "); dk != NULL; dk = strtok(NULL, " ")) {
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struct dkwedge_info dkw;
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if (strncmp(dk, "dk", 2) != 0)
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continue;
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fd = opendisk(dk, O_RDONLY, buf, bufsiz, 0);
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if (fd == -1)
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continue;
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if (ioctl(fd, DIOCGWEDGEINFO, &dkw) == -1) {
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savee = errno;
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snprintf(buf, bufsiz, "%s: getwedgeinfo", dk);
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(void)close(fd);
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goto out;
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}
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(void)close(fd);
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if (strcmp(vname, (char *)dkw.dkw_wname) == 0) {
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char *p = strstr(buf, "/rdk");
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if (p++ == NULL)
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return buf;
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strcpy(p, p + 1);
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free(drives);
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free(vname);
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return buf;
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}
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}
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savee = ESRCH;
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snprintf(buf, bufsiz, "no match for `%s'", vname);
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out:
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free(drives);
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free(vname);
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errno = savee;
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return NULL;
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}
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