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 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 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 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 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