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 2005 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 * Attempt to dynamically link in the ZFS libzfs.so.1 so that we can 31 * see if there are any ZFS zpools on any of the slices. 32 */ 33 34 #include <stdlib.h> 35 #include <stdio.h> 36 #include <strings.h> 37 #include <sys/param.h> 38 #include <sys/errno.h> 39 #include <sys/types.h> 40 #include <sys/stat.h> 41 #include <fcntl.h> 42 #include <thread.h> 43 #include <synch.h> 44 #include <dlfcn.h> 45 #include <link.h> 46 #include <ctype.h> 47 48 #include "libdiskmgt.h" 49 #include "disks_private.h" 50 51 /* 52 * Pointers to libzfs.so functions that we dynamically resolve. 53 */ 54 static int (*zfsdl_zpool_in_use)(int fd, char **desc, char **name); 55 56 static mutex_t init_lock = DEFAULTMUTEX; 57 static rwlock_t zpool_lock = DEFAULTRWLOCK; 58 static int initialized = 0; 59 60 static void *init_zpool(); 61 62 int 63 inuse_zpool(char *slice, nvlist_t *attrs, int *errp) 64 { 65 int found = 0; 66 char *desc, *name; 67 int fd; 68 69 *errp = 0; 70 if (slice == NULL) { 71 return (found); 72 } 73 74 (void) mutex_lock(&init_lock); 75 76 /* 77 * Dynamically load libzfs 78 */ 79 if (!initialized) { 80 if (!init_zpool()) { 81 (void) mutex_unlock(&init_lock); 82 return (found); 83 } 84 initialized = 1; 85 } 86 (void) mutex_unlock(&init_lock); 87 (void) rw_rdlock(&zpool_lock); 88 if ((fd = open(slice, O_RDONLY)) > 0) { 89 if (zfsdl_zpool_in_use(fd, &desc, &name)) { 90 libdiskmgt_add_str(attrs, DM_USED_BY, 91 DM_USE_ZPOOL, errp); 92 libdiskmgt_add_str(attrs, DM_USED_NAME, 93 name, errp); 94 found = 1; 95 } 96 } 97 (void) rw_unlock(&zpool_lock); 98 99 return (found); 100 } 101 102 /* 103 * Try to dynamically link the zfs functions we need. 104 */ 105 static void* 106 init_zpool() 107 { 108 void *lh = NULL; 109 110 if ((lh = dlopen("libzfs.so", RTLD_NOW)) == NULL) { 111 return (lh); 112 } 113 /* 114 * Instantiate the functions needed to get zpool configuration 115 * data 116 */ 117 if ((zfsdl_zpool_in_use = (int (*)(int, char **, char **))dlsym(lh, 118 "zpool_in_use")) == NULL) { 119 (void) dlclose(lh); 120 return (NULL); 121 } 122 123 return (lh); 124 } 125