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 <errno.h> 34 #include <fcntl.h> 35 #include <string.h> 36 #include <strings.h> 37 #include <unistd.h> 38 39 #include <ebuf.h> 40 #include <nv.h> 41 #include <pjdlog.h> 42 #include <subr.h> 43 44 #include "metadata.h" 45 46 int 47 metadata_read(struct hast_resource *res, bool openrw) 48 { 49 unsigned char *buf; 50 struct ebuf *eb; 51 struct nv *nv; 52 ssize_t done; 53 const char *str; 54 int rerrno; 55 bool opened_here; 56 57 opened_here = false; 58 rerrno = 0; 59 60 /* 61 * Is this first metadata_read() call for this resource? 62 */ 63 if (res->hr_localfd == -1) { 64 if (provinfo(res, openrw) == -1) { 65 rerrno = errno; 66 goto fail; 67 } 68 opened_here = true; 69 pjdlog_debug(1, "Obtained info about %s.", res->hr_localpath); 70 if (openrw) { 71 if (flock(res->hr_localfd, LOCK_EX | LOCK_NB) == -1) { 72 rerrno = errno; 73 if (errno == EOPNOTSUPP) { 74 pjdlog_warning("Unable to lock %s (operation not supported), but continuing.", 75 res->hr_localpath); 76 } else { 77 pjdlog_errno(LOG_ERR, 78 "Unable to lock %s", 79 res->hr_localpath); 80 goto fail; 81 } 82 } 83 pjdlog_debug(1, "Locked %s.", res->hr_localpath); 84 } 85 } 86 87 eb = ebuf_alloc(METADATA_SIZE); 88 if (eb == NULL) { 89 rerrno = errno; 90 pjdlog_errno(LOG_ERR, 91 "Unable to allocate memory to read metadata"); 92 goto fail; 93 } 94 if (ebuf_add_tail(eb, NULL, METADATA_SIZE) == -1) { 95 rerrno = errno; 96 pjdlog_errno(LOG_ERR, 97 "Unable to allocate memory to read metadata"); 98 ebuf_free(eb); 99 goto fail; 100 } 101 buf = ebuf_data(eb, NULL); 102 PJDLOG_ASSERT(buf != NULL); 103 done = pread(res->hr_localfd, buf, METADATA_SIZE, 0); 104 if (done == -1 || done != METADATA_SIZE) { 105 rerrno = errno; 106 pjdlog_errno(LOG_ERR, "Unable to read metadata"); 107 ebuf_free(eb); 108 goto fail; 109 } 110 nv = nv_ntoh(eb); 111 if (nv == NULL) { 112 rerrno = errno; 113 pjdlog_errno(LOG_ERR, "Metadata read from %s is invalid", 114 res->hr_localpath); 115 ebuf_free(eb); 116 goto fail; 117 } 118 119 str = nv_get_string(nv, "resource"); 120 if (str != NULL && strcmp(str, res->hr_name) != 0) { 121 pjdlog_error("Provider %s is not part of resource %s.", 122 res->hr_localpath, res->hr_name); 123 nv_free(nv); 124 goto fail; 125 } 126 127 res->hr_datasize = nv_get_uint64(nv, "datasize"); 128 res->hr_extentsize = (int)nv_get_uint32(nv, "extentsize"); 129 res->hr_keepdirty = (int)nv_get_uint32(nv, "keepdirty"); 130 res->hr_localoff = nv_get_uint64(nv, "offset"); 131 res->hr_resuid = nv_get_uint64(nv, "resuid"); 132 if (res->hr_role != HAST_ROLE_PRIMARY) { 133 /* Secondary or init role. */ 134 res->hr_secondary_localcnt = nv_get_uint64(nv, "localcnt"); 135 res->hr_secondary_remotecnt = nv_get_uint64(nv, "remotecnt"); 136 } 137 if (res->hr_role != HAST_ROLE_SECONDARY) { 138 /* Primary or init role. */ 139 res->hr_primary_localcnt = nv_get_uint64(nv, "localcnt"); 140 res->hr_primary_remotecnt = nv_get_uint64(nv, "remotecnt"); 141 } 142 str = nv_get_string(nv, "prevrole"); 143 if (str != NULL) { 144 if (strcmp(str, "primary") == 0) 145 res->hr_previous_role = HAST_ROLE_PRIMARY; 146 else if (strcmp(str, "secondary") == 0) 147 res->hr_previous_role = HAST_ROLE_SECONDARY; 148 } 149 150 if (nv_error(nv) != 0) { 151 errno = rerrno = nv_error(nv); 152 pjdlog_errno(LOG_ERR, "Unable to read metadata from %s", 153 res->hr_localpath); 154 nv_free(nv); 155 goto fail; 156 } 157 nv_free(nv); 158 return (0); 159 fail: 160 if (opened_here) { 161 close(res->hr_localfd); 162 res->hr_localfd = -1; 163 } 164 errno = rerrno; 165 return (-1); 166 } 167 168 int 169 metadata_write(struct hast_resource *res) 170 { 171 struct ebuf *eb; 172 struct nv *nv; 173 unsigned char *buf, *ptr; 174 size_t size; 175 ssize_t done; 176 int ret; 177 178 buf = calloc(1, METADATA_SIZE); 179 if (buf == NULL) { 180 pjdlog_error("Unable to allocate %zu bytes for metadata.", 181 (size_t)METADATA_SIZE); 182 return (-1); 183 } 184 185 ret = -1; 186 187 nv = nv_alloc(); 188 nv_add_string(nv, res->hr_name, "resource"); 189 nv_add_uint64(nv, (uint64_t)res->hr_datasize, "datasize"); 190 nv_add_uint32(nv, (uint32_t)res->hr_extentsize, "extentsize"); 191 nv_add_uint32(nv, (uint32_t)res->hr_keepdirty, "keepdirty"); 192 nv_add_uint64(nv, (uint64_t)res->hr_localoff, "offset"); 193 nv_add_uint64(nv, res->hr_resuid, "resuid"); 194 if (res->hr_role == HAST_ROLE_PRIMARY || 195 res->hr_role == HAST_ROLE_INIT) { 196 nv_add_uint64(nv, res->hr_primary_localcnt, "localcnt"); 197 nv_add_uint64(nv, res->hr_primary_remotecnt, "remotecnt"); 198 } else /* if (res->hr_role == HAST_ROLE_SECONDARY) */ { 199 PJDLOG_ASSERT(res->hr_role == HAST_ROLE_SECONDARY); 200 nv_add_uint64(nv, res->hr_secondary_localcnt, "localcnt"); 201 nv_add_uint64(nv, res->hr_secondary_remotecnt, "remotecnt"); 202 } 203 nv_add_string(nv, role2str(res->hr_role), "prevrole"); 204 if (nv_error(nv) != 0) { 205 pjdlog_error("Unable to create metadata."); 206 goto end; 207 } 208 res->hr_previous_role = res->hr_role; 209 eb = nv_hton(nv); 210 PJDLOG_ASSERT(eb != NULL); 211 ptr = ebuf_data(eb, &size); 212 PJDLOG_ASSERT(ptr != NULL); 213 PJDLOG_ASSERT(size < METADATA_SIZE); 214 bcopy(ptr, buf, size); 215 done = pwrite(res->hr_localfd, buf, METADATA_SIZE, 0); 216 if (done == -1 || done != METADATA_SIZE) { 217 pjdlog_errno(LOG_ERR, "Unable to write metadata"); 218 goto end; 219 } 220 ret = 0; 221 end: 222 free(buf); 223 nv_free(nv); 224 return (ret); 225 } 226