1 /*
2 *
3 * CDDL HEADER START
4 *
5 * The contents of this file are subject to the terms of the
6 * Common Development and Distribution License (the "License").
7 * You may not use this file except in compliance 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 /*
24 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
25 * Copyright 2013 Nexenta Systems, Inc. All rights reserved.
26 */
27
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <errno.h>
32 #include <ctype.h>
33 #include <alloca.h>
34 #include <limits.h>
35 #include <fm/topo_mod.h>
36 #include <sys/param.h>
37 #include <sys/systeminfo.h>
38 #include <sys/fm/protocol.h>
39 #include <sys/stat.h>
40
41 #include <topo_method.h>
42 #include <topo_subr.h>
43 #include <libzfs.h>
44 #include <zfs.h>
45 #include <pthread.h>
46
47 static int zfs_enum(topo_mod_t *, tnode_t *, const char *, topo_instance_t,
48 topo_instance_t, void *, void *);
49 static void zfs_rele(topo_mod_t *, tnode_t *);
50 static int zfs_fmri_nvl2str(topo_mod_t *, tnode_t *, topo_version_t,
51 nvlist_t *, nvlist_t **);
52
53 const topo_method_t zfs_methods[] = {
54 { TOPO_METH_NVL2STR, TOPO_METH_NVL2STR_DESC, TOPO_METH_NVL2STR_VERSION,
55 TOPO_STABILITY_INTERNAL, zfs_fmri_nvl2str },
56 { NULL }
57 };
58
59 static const topo_modops_t zfs_ops =
60 { zfs_enum, zfs_rele };
61 static const topo_modinfo_t zfs_info =
62 { ZFS, FM_FMRI_SCHEME_ZFS, ZFS_VERSION, &zfs_ops };
63
64 static libzfs_handle_t *g_zfs = NULL;
65 static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
66 static int g_refcount = 0;
67
68 int
zfs_init(topo_mod_t * mod,topo_version_t version)69 zfs_init(topo_mod_t *mod, topo_version_t version)
70 {
71 /*
72 * Turn on module debugging output
73 */
74 if (getenv("TOPOZFSDEBUG"))
75 topo_mod_setdebug(mod);
76
77 topo_mod_dprintf(mod, "initializing zfs builtin\n");
78
79 if (version != ZFS_VERSION)
80 return (topo_mod_seterrno(mod, EMOD_VER_NEW));
81
82 if (topo_mod_register(mod, &zfs_info, TOPO_VERSION) != 0) {
83 topo_mod_dprintf(mod, "failed to register zfs: "
84 "%s\n", topo_mod_errmsg(mod));
85 return (-1); /* mod errno already set */
86 }
87
88 (void) pthread_mutex_lock(&g_lock);
89 if (g_refcount == 0) {
90 if ((g_zfs = libzfs_init()) == NULL) {
91 (void) pthread_mutex_unlock(&g_lock);
92 topo_mod_dprintf(mod, "libzfs_init() failed");
93 topo_mod_unregister(mod);
94 return (topo_mod_seterrno(mod, EMOD_UNKNOWN));
95 }
96 }
97 g_refcount++;
98 (void) pthread_mutex_unlock(&g_lock);
99
100 return (0);
101 }
102
103 void
zfs_fini(topo_mod_t * mod)104 zfs_fini(topo_mod_t *mod)
105 {
106 (void) pthread_mutex_lock(&g_lock);
107 g_refcount--;
108 if (g_refcount == 0) {
109 libzfs_fini(g_zfs);
110 g_zfs = NULL;
111 }
112 (void) pthread_mutex_unlock(&g_lock);
113 topo_mod_unregister(mod);
114 }
115
116
117 /*ARGSUSED*/
118 int
zfs_enum(topo_mod_t * mod,tnode_t * pnode,const char * name,topo_instance_t min,topo_instance_t max,void * notused1,void * notused2)119 zfs_enum(topo_mod_t *mod, tnode_t *pnode, const char *name, topo_instance_t min,
120 topo_instance_t max, void *notused1, void *notused2)
121 {
122 /*
123 * Methods are registered, but there is no enumeration. Should
124 * enumeration be added be sure to cater for global vs non-global
125 * zones.
126 */
127 (void) topo_method_register(mod, pnode, zfs_methods);
128 return (0);
129 }
130
131 /*ARGSUSED*/
132 static void
zfs_rele(topo_mod_t * mp,tnode_t * node)133 zfs_rele(topo_mod_t *mp, tnode_t *node)
134 {
135 topo_method_unregister_all(mp, node);
136 }
137
138 typedef struct cbdata {
139 uint64_t cb_guid;
140 zpool_handle_t *cb_pool;
141 } cbdata_t;
142
143 static int
find_pool(zpool_handle_t * zhp,void * data)144 find_pool(zpool_handle_t *zhp, void *data)
145 {
146 cbdata_t *cbp = data;
147
148 if (zpool_get_prop_int(zhp, ZPOOL_PROP_GUID, NULL) == cbp->cb_guid) {
149 cbp->cb_pool = zhp;
150 return (1);
151 }
152
153 zpool_close(zhp);
154
155 return (0);
156 }
157
158 static ssize_t
fmri_nvl2str(nvlist_t * nvl,char * buf,size_t buflen)159 fmri_nvl2str(nvlist_t *nvl, char *buf, size_t buflen)
160 {
161 uint64_t pool_guid, vdev_guid;
162 cbdata_t cb;
163 ssize_t len;
164 const char *name;
165 char guidbuf[64];
166
167 (void) nvlist_lookup_uint64(nvl, FM_FMRI_ZFS_POOL, &pool_guid);
168
169 /*
170 * Attempt to convert the pool guid to a name.
171 */
172 cb.cb_guid = pool_guid;
173 cb.cb_pool = NULL;
174
175 if (zpool_iter(g_zfs, find_pool, &cb) == 1) {
176 name = zpool_get_name(cb.cb_pool);
177 } else {
178 (void) snprintf(guidbuf, sizeof (guidbuf), "%llx", pool_guid);
179 name = guidbuf;
180 }
181
182 if (nvlist_lookup_uint64(nvl, FM_FMRI_ZFS_VDEV, &vdev_guid) == 0)
183 len = snprintf(buf, buflen, "%s://pool=%s/vdev=%llx",
184 FM_FMRI_SCHEME_ZFS, name, vdev_guid);
185 else
186 len = snprintf(buf, buflen, "%s://pool=%s",
187 FM_FMRI_SCHEME_ZFS, name);
188
189 if (cb.cb_pool)
190 zpool_close(cb.cb_pool);
191
192 return (len);
193 }
194
195 /*ARGSUSED*/
196 static int
zfs_fmri_nvl2str(topo_mod_t * mod,tnode_t * node,topo_version_t version,nvlist_t * nvl,nvlist_t ** out)197 zfs_fmri_nvl2str(topo_mod_t *mod, tnode_t *node, topo_version_t version,
198 nvlist_t *nvl, nvlist_t **out)
199 {
200 ssize_t len;
201 char *name = NULL;
202 nvlist_t *fmristr;
203
204 if (version > TOPO_METH_NVL2STR_VERSION)
205 return (topo_mod_seterrno(mod, EMOD_VER_NEW));
206
207 if ((len = fmri_nvl2str(nvl, NULL, 0)) == 0 ||
208 (name = topo_mod_alloc(mod, len + 1)) == NULL ||
209 fmri_nvl2str(nvl, name, len + 1) == 0) {
210 if (name != NULL)
211 topo_mod_free(mod, name, len + 1);
212 return (topo_mod_seterrno(mod, EMOD_FMRI_NVL));
213 }
214
215 if (topo_mod_nvalloc(mod, &fmristr, NV_UNIQUE_NAME) != 0) {
216 topo_mod_free(mod, name, len + 1);
217 return (topo_mod_seterrno(mod, EMOD_FMRI_NVL));
218 }
219 if (nvlist_add_string(fmristr, "fmri-string", name) != 0) {
220 topo_mod_free(mod, name, len + 1);
221 nvlist_free(fmristr);
222 return (topo_mod_seterrno(mod, EMOD_FMRI_NVL));
223 }
224 topo_mod_free(mod, name, len + 1);
225 *out = fmristr;
226
227 return (0);
228 }
229