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 /* 28 * Checks for a match with the the dump slice. 29 */ 30 31 #include <stdlib.h> 32 #include <stdio.h> 33 #include <unistd.h> 34 #include <string.h> 35 #include <synch.h> 36 #include <sys/param.h> 37 #include <sys/types.h> 38 #include <sys/stat.h> 39 #include <fcntl.h> 40 #include <sys/dumpadm.h> 41 42 #include "libdiskmgt.h" 43 #include "disks_private.h" 44 45 /* Cached file descriptor for /dev/dump. */ 46 static int dump_fd = -1; 47 48 static mutex_t dump_lock = DEFAULTMUTEX; 49 50 /* 51 * Check the dump device against the input slice. 52 */ 53 int 54 inuse_dump(char *slice, nvlist_t *attrs, int *errp) 55 { 56 int found = 0; 57 int fd; 58 char device[MAXPATHLEN]; 59 60 *errp = 0; 61 if (slice == NULL) { 62 return (found); 63 } 64 65 /* 66 * We only want to open /dev/dump once instead of for every 67 * slice so we cache the open file descriptor. The ioctl 68 * is cheap so we can do that for every slice. 69 */ 70 (void) mutex_lock(&dump_lock); 71 72 if (dump_fd == -1) { 73 if ((dump_fd = open("/dev/dump", O_RDONLY)) >= 0) 74 (void) fcntl(dump_fd, F_SETFD, FD_CLOEXEC); 75 } 76 77 fd = dump_fd; 78 79 (void) mutex_unlock(&dump_lock); 80 81 if (fd != -1) { 82 if (ioctl(fd, DIOCGETDEV, device) != -1) { 83 if (strcmp(slice, device) == 0) { 84 libdiskmgt_add_str(attrs, DM_USED_BY, 85 DM_USE_DUMP, errp); 86 libdiskmgt_add_str(attrs, DM_USED_NAME, 87 DM_USE_DUMP, errp); 88 found = 1; 89 } 90 } 91 } 92 93 return (found); 94 } 95