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 /* 27 * Attempt to dynamically link in the ZFS libzfs.so.1 so that we can 28 * see if there are any ZFS zpools on any of the slices. 29 */ 30 31 #include <stdlib.h> 32 #include <stdio.h> 33 #include <strings.h> 34 #include <unistd.h> 35 #include <sys/param.h> 36 #include <sys/errno.h> 37 #include <sys/types.h> 38 #include <sys/stat.h> 39 #include <fcntl.h> 40 #include <thread.h> 41 #include <synch.h> 42 #include <dlfcn.h> 43 #include <link.h> 44 #include <ctype.h> 45 #include <sys/fs/zfs.h> 46 47 #include <libzfs.h> 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)(libzfs_handle_t *hdl, int fd, 55 pool_state_t *state, char **name, boolean_t *); 56 static libzfs_handle_t *(*zfsdl_libzfs_init)(boolean_t); 57 58 static mutex_t init_lock = DEFAULTMUTEX; 59 static rwlock_t zpool_lock = DEFAULTRWLOCK; 60 static boolean_t initialized; 61 static libzfs_handle_t *zfs_hdl; 62 63 static void *init_zpool(); 64 65 static int 66 inuse_zpool_common(char *slice, nvlist_t *attrs, int *errp, char *type) 67 { 68 int found = 0; 69 char *name; 70 int fd; 71 pool_state_t state; 72 boolean_t used; 73 74 *errp = 0; 75 if (slice == NULL) { 76 return (found); 77 } 78 79 (void) mutex_lock(&init_lock); 80 81 /* 82 * Dynamically load libzfs 83 */ 84 if (!initialized) { 85 if (!init_zpool()) { 86 (void) mutex_unlock(&init_lock); 87 return (found); 88 } 89 initialized = B_TRUE; 90 } 91 (void) mutex_unlock(&init_lock); 92 (void) rw_rdlock(&zpool_lock); 93 if ((fd = open(slice, O_RDONLY)) > 0) { 94 name = NULL; 95 if (zfsdl_zpool_in_use(zfs_hdl, fd, &state, 96 &name, &used) == 0 && used) { 97 if (strcmp(type, DM_USE_ACTIVE_ZPOOL) == 0) { 98 if (state == POOL_STATE_ACTIVE) { 99 found = 1; 100 } else if (state == POOL_STATE_SPARE) { 101 found = 1; 102 type = DM_USE_SPARE_ZPOOL; 103 } else if (state == POOL_STATE_L2CACHE) { 104 found = 1; 105 type = DM_USE_L2CACHE_ZPOOL; 106 } 107 } else { 108 found = 1; 109 } 110 111 if (found) { 112 libdiskmgt_add_str(attrs, DM_USED_BY, 113 type, errp); 114 libdiskmgt_add_str(attrs, DM_USED_NAME, 115 name, errp); 116 } 117 } 118 if (name) 119 free(name); 120 (void) close(fd); 121 } 122 (void) rw_unlock(&zpool_lock); 123 124 return (found); 125 } 126 127 int 128 inuse_active_zpool(char *slice, nvlist_t *attrs, int *errp) 129 { 130 return (inuse_zpool_common(slice, attrs, errp, DM_USE_ACTIVE_ZPOOL)); 131 } 132 133 int 134 inuse_exported_zpool(char *slice, nvlist_t *attrs, int *errp) 135 { 136 return (inuse_zpool_common(slice, attrs, errp, DM_USE_EXPORTED_ZPOOL)); 137 } 138 139 /* 140 * Try to dynamically link the zfs functions we need. 141 */ 142 static void* 143 init_zpool() 144 { 145 void *lh = NULL; 146 147 if ((lh = dlopen("libzfs.so", RTLD_NOW)) == NULL) { 148 return (lh); 149 } 150 151 /* 152 * Instantiate the functions needed to get zpool configuration 153 * data 154 */ 155 if ((zfsdl_libzfs_init = (libzfs_handle_t *(*)(boolean_t)) 156 dlsym(lh, "libzfs_init")) == NULL || 157 (zfsdl_zpool_in_use = (int (*)(libzfs_handle_t *, int, 158 pool_state_t *, char **, boolean_t *)) 159 dlsym(lh, "zpool_in_use")) == NULL) { 160 (void) dlclose(lh); 161 return (NULL); 162 } 163 164 if ((zfs_hdl = (*zfsdl_libzfs_init)(B_FALSE)) == NULL) { 165 (void) dlclose(lh); 166 return (NULL); 167 } 168 169 return (lh); 170 } 171