1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* 30 * Checks for a match with the the dump slice. 31 */ 32 33 #include <stdlib.h> 34 #include <stdio.h> 35 #include <unistd.h> 36 #include <string.h> 37 #include <synch.h> 38 #include <sys/param.h> 39 #include <sys/types.h> 40 #include <sys/stat.h> 41 #include <fcntl.h> 42 #include <sys/dumpadm.h> 43 44 #include "libdiskmgt.h" 45 #include "disks_private.h" 46 47 /* Cached file descriptor for /dev/dump. */ 48 static int dump_fd = -1; 49 50 static mutex_t dump_lock = DEFAULTMUTEX; 51 52 /* 53 * Check the dump device against the input slice. 54 */ 55 int 56 inuse_dump(char *slice, nvlist_t *attrs, int *errp) 57 { 58 int found = 0; 59 int fd; 60 char device[MAXPATHLEN]; 61 62 *errp = 0; 63 if (slice == NULL) { 64 return (found); 65 } 66 67 /* 68 * We only want to open /dev/dump once instead of for every 69 * slice so we cache the open file descriptor. The ioctl 70 * is cheap so we can do that for every slice. 71 */ 72 (void) mutex_lock(&dump_lock); 73 74 if (dump_fd == -1) { 75 if ((dump_fd = open("/dev/dump", O_RDONLY)) >= 0) 76 (void) fcntl(dump_fd, F_SETFD, FD_CLOEXEC); 77 } 78 79 fd = dump_fd; 80 81 (void) mutex_unlock(&dump_lock); 82 83 if (fd != -1) { 84 if (ioctl(fd, DIOCGETDEV, device) != -1) { 85 if (strcmp(slice, device) == 0) { 86 libdiskmgt_add_str(attrs, DM_USED_BY, 87 DM_USE_DUMP, errp); 88 libdiskmgt_add_str(attrs, DM_USED_NAME, 89 DM_USE_DUMP, errp); 90 found = 1; 91 } 92 } 93 } 94 95 return (found); 96 } 97