1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2009-2010 The FreeBSD Foundation 5 * 6 * This software was developed by Pawel Jakub Dawidek under sponsorship from 7 * the FreeBSD Foundation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 #include <errno.h> 33 #include <fcntl.h> 34 #include <string.h> 35 #include <strings.h> 36 #include <unistd.h> 37 38 #include <ebuf.h> 39 #include <nv.h> 40 #include <pjdlog.h> 41 #include <subr.h> 42 43 #include "metadata.h" 44 45 int 46 metadata_read(struct hast_resource *res, bool openrw) 47 { 48 unsigned char *buf; 49 struct ebuf *eb; 50 struct nv *nv; 51 ssize_t done; 52 const char *str; 53 int rerrno; 54 bool opened_here; 55 56 opened_here = false; 57 rerrno = 0; 58 59 /* 60 * Is this first metadata_read() call for this resource? 61 */ 62 if (res->hr_localfd == -1) { 63 if (provinfo(res, openrw) == -1) { 64 rerrno = errno; 65 goto fail; 66 } 67 opened_here = true; 68 pjdlog_debug(1, "Obtained info about %s.", res->hr_localpath); 69 if (openrw) { 70 if (flock(res->hr_localfd, LOCK_EX | LOCK_NB) == -1) { 71 rerrno = errno; 72 if (errno == EOPNOTSUPP) { 73 pjdlog_warning("Unable to lock %s (operation not supported), but continuing.", 74 res->hr_localpath); 75 } else { 76 pjdlog_errno(LOG_ERR, 77 "Unable to lock %s", 78 res->hr_localpath); 79 goto fail; 80 } 81 } 82 pjdlog_debug(1, "Locked %s.", res->hr_localpath); 83 } 84 } 85 86 eb = ebuf_alloc(METADATA_SIZE); 87 if (eb == NULL) { 88 rerrno = errno; 89 pjdlog_errno(LOG_ERR, 90 "Unable to allocate memory to read metadata"); 91 goto fail; 92 } 93 if (ebuf_add_tail(eb, NULL, METADATA_SIZE) == -1) { 94 rerrno = errno; 95 pjdlog_errno(LOG_ERR, 96 "Unable to allocate memory to read metadata"); 97 ebuf_free(eb); 98 goto fail; 99 } 100 buf = ebuf_data(eb, NULL); 101 PJDLOG_ASSERT(buf != NULL); 102 done = pread(res->hr_localfd, buf, METADATA_SIZE, 0); 103 if (done == -1 || done != METADATA_SIZE) { 104 rerrno = errno; 105 pjdlog_errno(LOG_ERR, "Unable to read metadata"); 106 ebuf_free(eb); 107 goto fail; 108 } 109 nv = nv_ntoh(eb); 110 if (nv == NULL) { 111 rerrno = errno; 112 pjdlog_errno(LOG_ERR, "Metadata read from %s is invalid", 113 res->hr_localpath); 114 ebuf_free(eb); 115 goto fail; 116 } 117 118 str = nv_get_string(nv, "resource"); 119 if (str != NULL && strcmp(str, res->hr_name) != 0) { 120 pjdlog_error("Provider %s is not part of resource %s.", 121 res->hr_localpath, res->hr_name); 122 nv_free(nv); 123 goto fail; 124 } 125 126 res->hr_datasize = nv_get_uint64(nv, "datasize"); 127 res->hr_extentsize = (int)nv_get_uint32(nv, "extentsize"); 128 res->hr_keepdirty = (int)nv_get_uint32(nv, "keepdirty"); 129 res->hr_localoff = nv_get_uint64(nv, "offset"); 130 res->hr_resuid = nv_get_uint64(nv, "resuid"); 131 if (res->hr_role != HAST_ROLE_PRIMARY) { 132 /* Secondary or init role. */ 133 res->hr_secondary_localcnt = nv_get_uint64(nv, "localcnt"); 134 res->hr_secondary_remotecnt = nv_get_uint64(nv, "remotecnt"); 135 } 136 if (res->hr_role != HAST_ROLE_SECONDARY) { 137 /* Primary or init role. */ 138 res->hr_primary_localcnt = nv_get_uint64(nv, "localcnt"); 139 res->hr_primary_remotecnt = nv_get_uint64(nv, "remotecnt"); 140 } 141 str = nv_get_string(nv, "prevrole"); 142 if (str != NULL) { 143 if (strcmp(str, "primary") == 0) 144 res->hr_previous_role = HAST_ROLE_PRIMARY; 145 else if (strcmp(str, "secondary") == 0) 146 res->hr_previous_role = HAST_ROLE_SECONDARY; 147 } 148 149 if (nv_error(nv) != 0) { 150 errno = rerrno = nv_error(nv); 151 pjdlog_errno(LOG_ERR, "Unable to read metadata from %s", 152 res->hr_localpath); 153 nv_free(nv); 154 goto fail; 155 } 156 nv_free(nv); 157 return (0); 158 fail: 159 if (opened_here) { 160 close(res->hr_localfd); 161 res->hr_localfd = -1; 162 } 163 errno = rerrno; 164 return (-1); 165 } 166 167 int 168 metadata_write(struct hast_resource *res) 169 { 170 struct ebuf *eb; 171 struct nv *nv; 172 unsigned char *buf, *ptr; 173 size_t size; 174 ssize_t done; 175 int ret; 176 177 buf = calloc(1, METADATA_SIZE); 178 if (buf == NULL) { 179 pjdlog_error("Unable to allocate %zu bytes for metadata.", 180 (size_t)METADATA_SIZE); 181 return (-1); 182 } 183 184 ret = -1; 185 186 nv = nv_alloc(); 187 nv_add_string(nv, res->hr_name, "resource"); 188 nv_add_uint64(nv, (uint64_t)res->hr_datasize, "datasize"); 189 nv_add_uint32(nv, (uint32_t)res->hr_extentsize, "extentsize"); 190 nv_add_uint32(nv, (uint32_t)res->hr_keepdirty, "keepdirty"); 191 nv_add_uint64(nv, (uint64_t)res->hr_localoff, "offset"); 192 nv_add_uint64(nv, res->hr_resuid, "resuid"); 193 if (res->hr_role == HAST_ROLE_PRIMARY || 194 res->hr_role == HAST_ROLE_INIT) { 195 nv_add_uint64(nv, res->hr_primary_localcnt, "localcnt"); 196 nv_add_uint64(nv, res->hr_primary_remotecnt, "remotecnt"); 197 } else /* if (res->hr_role == HAST_ROLE_SECONDARY) */ { 198 PJDLOG_ASSERT(res->hr_role == HAST_ROLE_SECONDARY); 199 nv_add_uint64(nv, res->hr_secondary_localcnt, "localcnt"); 200 nv_add_uint64(nv, res->hr_secondary_remotecnt, "remotecnt"); 201 } 202 nv_add_string(nv, role2str(res->hr_role), "prevrole"); 203 if (nv_error(nv) != 0) { 204 pjdlog_error("Unable to create metadata."); 205 goto end; 206 } 207 res->hr_previous_role = res->hr_role; 208 eb = nv_hton(nv); 209 PJDLOG_ASSERT(eb != NULL); 210 ptr = ebuf_data(eb, &size); 211 PJDLOG_ASSERT(ptr != NULL); 212 PJDLOG_ASSERT(size < METADATA_SIZE); 213 bcopy(ptr, buf, size); 214 done = pwrite(res->hr_localfd, buf, METADATA_SIZE, 0); 215 if (done == -1 || done != METADATA_SIZE) { 216 pjdlog_errno(LOG_ERR, "Unable to write metadata"); 217 goto end; 218 } 219 ret = 0; 220 end: 221 free(buf); 222 nv_free(nv); 223 return (ret); 224 } 225