1 /*- 2 * Copyright (c) 2009-2010 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Pawel Jakub Dawidek under sponsorship from 6 * the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <assert.h> 34 #include <errno.h> 35 #include <fcntl.h> 36 #include <string.h> 37 #include <strings.h> 38 #include <unistd.h> 39 40 #include <ebuf.h> 41 #include <nv.h> 42 #include <pjdlog.h> 43 #include <subr.h> 44 45 #include "metadata.h" 46 47 int 48 metadata_read(struct hast_resource *res, bool openrw) 49 { 50 unsigned char *buf; 51 struct ebuf *eb; 52 struct nv *nv; 53 ssize_t done; 54 const char *str; 55 int rerrno; 56 bool opened_here; 57 58 opened_here = false; 59 rerrno = 0; 60 61 /* 62 * Is this first metadata_read() call for this resource? 63 */ 64 if (res->hr_localfd == -1) { 65 if (provinfo(res, openrw) < 0) { 66 rerrno = errno; 67 goto fail; 68 } 69 opened_here = true; 70 pjdlog_debug(1, "Obtained info about %s.", res->hr_localpath); 71 if (openrw) { 72 if (flock(res->hr_localfd, LOCK_EX | LOCK_NB) < 0) { 73 rerrno = errno; 74 if (errno == EOPNOTSUPP) { 75 pjdlog_warning("Unable to lock %s (operation not supported), but continuing.", 76 res->hr_localpath); 77 } else { 78 pjdlog_errno(LOG_ERR, 79 "Unable to lock %s", 80 res->hr_localpath); 81 goto fail; 82 } 83 } 84 pjdlog_debug(1, "Locked %s.", res->hr_localpath); 85 } 86 } 87 88 eb = ebuf_alloc(METADATA_SIZE); 89 if (eb == NULL) { 90 rerrno = errno; 91 pjdlog_errno(LOG_ERR, 92 "Unable to allocate memory to read metadata"); 93 goto fail; 94 } 95 if (ebuf_add_tail(eb, NULL, METADATA_SIZE) < 0) { 96 rerrno = errno; 97 pjdlog_errno(LOG_ERR, 98 "Unable to allocate memory to read metadata"); 99 ebuf_free(eb); 100 goto fail; 101 } 102 buf = ebuf_data(eb, NULL); 103 assert(buf != NULL); 104 done = pread(res->hr_localfd, buf, METADATA_SIZE, 0); 105 if (done < 0 || done != METADATA_SIZE) { 106 rerrno = errno; 107 pjdlog_errno(LOG_ERR, "Unable to read metadata"); 108 ebuf_free(eb); 109 goto fail; 110 } 111 nv = nv_ntoh(eb); 112 if (nv == NULL) { 113 rerrno = errno; 114 pjdlog_errno(LOG_ERR, "Metadata read from %s is invalid", 115 res->hr_localpath); 116 ebuf_free(eb); 117 goto fail; 118 } 119 120 str = nv_get_string(nv, "resource"); 121 if (str != NULL && strcmp(str, res->hr_name) != 0) { 122 pjdlog_error("Provider %s is not part of resource %s.", 123 res->hr_localpath, res->hr_name); 124 nv_free(nv); 125 goto fail; 126 } 127 128 res->hr_datasize = nv_get_uint64(nv, "datasize"); 129 res->hr_extentsize = (int)nv_get_uint32(nv, "extentsize"); 130 res->hr_keepdirty = (int)nv_get_uint32(nv, "keepdirty"); 131 res->hr_localoff = nv_get_uint64(nv, "offset"); 132 res->hr_resuid = nv_get_uint64(nv, "resuid"); 133 if (res->hr_role != HAST_ROLE_PRIMARY) { 134 /* Secondary or init role. */ 135 res->hr_secondary_localcnt = nv_get_uint64(nv, "localcnt"); 136 res->hr_secondary_remotecnt = nv_get_uint64(nv, "remotecnt"); 137 } 138 if (res->hr_role != HAST_ROLE_SECONDARY) { 139 /* Primary or init role. */ 140 res->hr_primary_localcnt = nv_get_uint64(nv, "localcnt"); 141 res->hr_primary_remotecnt = nv_get_uint64(nv, "remotecnt"); 142 } 143 str = nv_get_string(nv, "prevrole"); 144 if (str != NULL) { 145 if (strcmp(str, "primary") == 0) 146 res->hr_previous_role = HAST_ROLE_PRIMARY; 147 else if (strcmp(str, "secondary") == 0) 148 res->hr_previous_role = HAST_ROLE_SECONDARY; 149 } 150 151 if (nv_error(nv) != 0) { 152 errno = rerrno = nv_error(nv); 153 pjdlog_errno(LOG_ERR, "Unable to read metadata from %s", 154 res->hr_localpath); 155 nv_free(nv); 156 goto fail; 157 } 158 nv_free(nv); 159 return (0); 160 fail: 161 if (opened_here) { 162 close(res->hr_localfd); 163 res->hr_localfd = -1; 164 } 165 errno = rerrno; 166 return (-1); 167 } 168 169 int 170 metadata_write(struct hast_resource *res) 171 { 172 struct ebuf *eb; 173 struct nv *nv; 174 unsigned char *buf, *ptr; 175 size_t size; 176 ssize_t done; 177 int ret; 178 179 buf = calloc(1, METADATA_SIZE); 180 if (buf == NULL) { 181 pjdlog_error("Unable to allocate %zu bytes for metadata.", 182 (size_t)METADATA_SIZE); 183 return (-1); 184 } 185 186 ret = -1; 187 188 nv = nv_alloc(); 189 nv_add_string(nv, res->hr_name, "resource"); 190 nv_add_uint64(nv, (uint64_t)res->hr_datasize, "datasize"); 191 nv_add_uint32(nv, (uint32_t)res->hr_extentsize, "extentsize"); 192 nv_add_uint32(nv, (uint32_t)res->hr_keepdirty, "keepdirty"); 193 nv_add_uint64(nv, (uint64_t)res->hr_localoff, "offset"); 194 nv_add_uint64(nv, res->hr_resuid, "resuid"); 195 if (res->hr_role == HAST_ROLE_PRIMARY || 196 res->hr_role == HAST_ROLE_INIT) { 197 nv_add_uint64(nv, res->hr_primary_localcnt, "localcnt"); 198 nv_add_uint64(nv, res->hr_primary_remotecnt, "remotecnt"); 199 } else /* if (res->hr_role == HAST_ROLE_SECONDARY) */ { 200 assert(res->hr_role == HAST_ROLE_SECONDARY); 201 nv_add_uint64(nv, res->hr_secondary_localcnt, "localcnt"); 202 nv_add_uint64(nv, res->hr_secondary_remotecnt, "remotecnt"); 203 } 204 nv_add_string(nv, role2str(res->hr_role), "prevrole"); 205 if (nv_error(nv) != 0) { 206 pjdlog_error("Unable to create metadata."); 207 goto end; 208 } 209 res->hr_previous_role = res->hr_role; 210 eb = nv_hton(nv); 211 assert(eb != NULL); 212 ptr = ebuf_data(eb, &size); 213 assert(ptr != NULL); 214 assert(size < METADATA_SIZE); 215 bcopy(ptr, buf, size); 216 done = pwrite(res->hr_localfd, buf, METADATA_SIZE, 0); 217 if (done < 0 || done != METADATA_SIZE) { 218 pjdlog_errno(LOG_ERR, "Unable to write metadata"); 219 goto end; 220 } 221 ret = 0; 222 end: 223 free(buf); 224 nv_free(nv); 225 return (ret); 226 } 227