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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 /* 29 * Attempt to dynamically link in the ZFS libzfs.so.1 so that we can 30 * see if there are any ZFS zpools on any of the slices. 31 */ 32 33 #include <stdlib.h> 34 #include <stdio.h> 35 #include <strings.h> 36 #include <unistd.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 #include <sys/fs/zfs.h> 48 49 #include <libzfs.h> 50 #include "libdiskmgt.h" 51 #include "disks_private.h" 52 53 /* 54 * Pointers to libzfs.so functions that we dynamically resolve. 55 */ 56 static int (*zfsdl_zpool_in_use)(libzfs_handle_t *hdl, int fd, 57 pool_state_t *state, char **name, boolean_t *); 58 static libzfs_handle_t *(*zfsdl_libzfs_init)(boolean_t); 59 60 static mutex_t init_lock = DEFAULTMUTEX; 61 static rwlock_t zpool_lock = DEFAULTRWLOCK; 62 static boolean_t initialized; 63 static libzfs_handle_t *zfs_hdl; 64 65 static void *init_zpool(); 66 67 static int 68 inuse_zpool_common(char *slice, nvlist_t *attrs, int *errp, char *type) 69 { 70 int found = 0; 71 char *name; 72 int fd; 73 pool_state_t state; 74 boolean_t used; 75 76 *errp = 0; 77 if (slice == NULL) { 78 return (found); 79 } 80 81 (void) mutex_lock(&init_lock); 82 83 /* 84 * Dynamically load libzfs 85 */ 86 if (!initialized) { 87 if (!init_zpool()) { 88 (void) mutex_unlock(&init_lock); 89 return (found); 90 } 91 initialized = B_TRUE; 92 } 93 (void) mutex_unlock(&init_lock); 94 (void) rw_rdlock(&zpool_lock); 95 if ((fd = open(slice, O_RDONLY)) > 0) { 96 name = NULL; 97 if (zfsdl_zpool_in_use(zfs_hdl, fd, &state, 98 &name, &used) == 0 && used) { 99 if (strcmp(type, DM_USE_ACTIVE_ZPOOL) == 0) { 100 if (state == POOL_STATE_ACTIVE) { 101 found = 1; 102 } else if (state == POOL_STATE_SPARE) { 103 found = 1; 104 type = DM_USE_SPARE_ZPOOL; 105 } else if (state == POOL_STATE_L2CACHE) { 106 found = 1; 107 type = DM_USE_L2CACHE_ZPOOL; 108 } 109 } else { 110 found = 1; 111 } 112 113 if (found) { 114 libdiskmgt_add_str(attrs, DM_USED_BY, 115 type, errp); 116 libdiskmgt_add_str(attrs, DM_USED_NAME, 117 name, errp); 118 } 119 } 120 if (name) 121 free(name); 122 (void) close(fd); 123 } 124 (void) rw_unlock(&zpool_lock); 125 126 return (found); 127 } 128 129 int 130 inuse_active_zpool(char *slice, nvlist_t *attrs, int *errp) 131 { 132 return (inuse_zpool_common(slice, attrs, errp, DM_USE_ACTIVE_ZPOOL)); 133 } 134 135 int 136 inuse_exported_zpool(char *slice, nvlist_t *attrs, int *errp) 137 { 138 return (inuse_zpool_common(slice, attrs, errp, DM_USE_EXPORTED_ZPOOL)); 139 } 140 141 /* 142 * Try to dynamically link the zfs functions we need. 143 */ 144 static void* 145 init_zpool() 146 { 147 void *lh = NULL; 148 149 if ((lh = dlopen("libzfs.so", RTLD_NOW)) == NULL) { 150 return (lh); 151 } 152 153 /* 154 * Instantiate the functions needed to get zpool configuration 155 * data 156 */ 157 if ((zfsdl_libzfs_init = (libzfs_handle_t *(*)(boolean_t)) 158 dlsym(lh, "libzfs_init")) == NULL || 159 (zfsdl_zpool_in_use = (int (*)(libzfs_handle_t *, int, 160 pool_state_t *, char **, boolean_t *)) 161 dlsym(lh, "zpool_in_use")) == NULL) { 162 (void) dlclose(lh); 163 return (NULL); 164 } 165 166 if ((zfs_hdl = (*zfsdl_libzfs_init)(B_FALSE)) == NULL) { 167 (void) dlclose(lh); 168 return (NULL); 169 } 170 171 return (lh); 172 } 173