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 2006 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 *
25 * Copyright 2020 Joyent, Inc.
26 */
27
28 /*
29 * libfstyp module for zfs
30 */
31 #include <fcntl.h>
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <sys/debug.h>
35 #include <sys/types.h>
36 #include <unistd.h>
37 #include <libintl.h>
38 #include <locale.h>
39 #include <string.h>
40 #include <libnvpair.h>
41 #include <libzfs.h>
42 #include <libzutil.h>
43 #include <libfstyp_module.h>
44 #include <errno.h>
45
46 struct fstyp_zfs {
47 int fd;
48 nvlist_t *config;
49 };
50
51 int fstyp_mod_init(int fd, off_t offset, fstyp_mod_handle_t *handle);
52 void fstyp_mod_fini(fstyp_mod_handle_t handle);
53 int fstyp_mod_ident(fstyp_mod_handle_t handle);
54 int fstyp_mod_get_attr(fstyp_mod_handle_t handle, nvlist_t **attrp);
55
56 int
fstyp_mod_init(int fd,off_t offset,fstyp_mod_handle_t * handle)57 fstyp_mod_init(int fd, off_t offset, fstyp_mod_handle_t *handle)
58 {
59 struct fstyp_zfs *h;
60
61 if (offset != 0) {
62 return (FSTYP_ERR_OFFSET);
63 }
64
65 if ((h = calloc(1, sizeof (struct fstyp_zfs))) == NULL) {
66 return (FSTYP_ERR_NOMEM);
67 }
68 h->fd = fd;
69
70 *handle = (fstyp_mod_handle_t)h;
71 return (0);
72 }
73
74 void
fstyp_mod_fini(fstyp_mod_handle_t handle)75 fstyp_mod_fini(fstyp_mod_handle_t handle)
76 {
77 struct fstyp_zfs *h = (struct fstyp_zfs *)handle;
78
79 if (h->config != NULL) {
80 nvlist_free(h->config);
81 }
82 free(h);
83 }
84
85 int
fstyp_mod_ident(fstyp_mod_handle_t handle)86 fstyp_mod_ident(fstyp_mod_handle_t handle)
87 {
88 struct fstyp_zfs *h = (struct fstyp_zfs *)handle;
89 uint64_t state;
90 char *str;
91 uint64_t u64;
92 char buf[64];
93 int num_labels = 0;
94
95 if (zpool_read_label(h->fd, &h->config, &num_labels) != 0) {
96 /* This is the only reason zpool_read_label() can fail */
97 VERIFY3S(errno, ==, ENOMEM);
98 return (FSTYP_ERR_NOMEM);
99 }
100
101 if (num_labels == 0)
102 return (FSTYP_ERR_NO_MATCH);
103
104 if (nvlist_lookup_uint64(h->config, ZPOOL_CONFIG_POOL_STATE,
105 &state) != 0 || state == POOL_STATE_DESTROYED) {
106 nvlist_free(h->config);
107 h->config = NULL;
108 return (FSTYP_ERR_NO_MATCH);
109 }
110
111 /* add generic attributes */
112 (void) nvlist_add_boolean_value(h->config, "gen_clean", B_TRUE);
113 if (nvlist_lookup_uint64(h->config, "guid", &u64) == 0) {
114 (void) snprintf(buf, sizeof (buf), "%llu", (u_longlong_t)u64);
115 (void) nvlist_add_string(h->config, "gen_guid", buf);
116 }
117 if (nvlist_lookup_uint64(h->config, "version", &u64) == 0) {
118 (void) snprintf(buf, sizeof (buf), "%llu", (u_longlong_t)u64);
119 (void) nvlist_add_string(h->config, "gen_version", buf);
120 }
121 if (nvlist_lookup_string(h->config, "name", &str) == 0) {
122 (void) nvlist_add_string(h->config, "gen_volume_label", str);
123 }
124
125 return (0);
126 }
127
128 int
fstyp_mod_get_attr(fstyp_mod_handle_t handle,nvlist_t ** attrp)129 fstyp_mod_get_attr(fstyp_mod_handle_t handle, nvlist_t **attrp)
130 {
131 struct fstyp_zfs *h = (struct fstyp_zfs *)handle;
132
133 *attrp = h->config;
134 return (0);
135 }
136