metadata.c revision 204076
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: head/sbin/hastd/metadata.c 204076 2010-02-18 23:16:19Z pjd $"); 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 47int 48metadata_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 goto fail; 100 } 101 buf = ebuf_data(eb, NULL); 102 assert(buf != NULL); 103 done = pread(res->hr_localfd, buf, METADATA_SIZE, 0); 104 if (done < 0 || 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 (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 return (0); 158fail: 159 if (opened_here) { 160 close(res->hr_localfd); 161 res->hr_localfd = -1; 162 } 163 errno = rerrno; 164 return (-1); 165} 166 167int 168metadata_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; 175 176 buf = calloc(1, METADATA_SIZE); 177 if (buf == NULL) { 178 pjdlog_error("Unable to allocate %zu bytes for metadata.", 179 (size_t)METADATA_SIZE); 180 return (-1); 181 } 182 183 nv = nv_alloc(); 184 nv_add_string(nv, res->hr_name, "resource"); 185 nv_add_uint64(nv, (uint64_t)res->hr_datasize, "datasize"); 186 nv_add_uint32(nv, (uint32_t)res->hr_extentsize, "extentsize"); 187 nv_add_uint32(nv, (uint32_t)res->hr_keepdirty, "keepdirty"); 188 nv_add_uint64(nv, (uint64_t)res->hr_localoff, "offset"); 189 nv_add_uint64(nv, res->hr_resuid, "resuid"); 190 if (res->hr_role == HAST_ROLE_PRIMARY || 191 res->hr_role == HAST_ROLE_INIT) { 192 nv_add_uint64(nv, res->hr_primary_localcnt, "localcnt"); 193 nv_add_uint64(nv, res->hr_primary_remotecnt, "remotecnt"); 194 } else /* if (res->hr_role == HAST_ROLE_SECONDARY) */ { 195 assert(res->hr_role == HAST_ROLE_SECONDARY); 196 nv_add_uint64(nv, res->hr_secondary_localcnt, "localcnt"); 197 nv_add_uint64(nv, res->hr_secondary_remotecnt, "remotecnt"); 198 } 199 nv_add_string(nv, role2str(res->hr_role), "prevrole"); 200 if (nv_error(nv) != 0) { 201 pjdlog_error("Unable to create metadata."); 202 goto fail; 203 } 204 res->hr_previous_role = res->hr_role; 205 eb = nv_hton(nv); 206 assert(eb != NULL); 207 ptr = ebuf_data(eb, &size); 208 assert(ptr != NULL); 209 assert(size < METADATA_SIZE); 210 bcopy(ptr, buf, size); 211 done = pwrite(res->hr_localfd, buf, METADATA_SIZE, 0); 212 if (done < 0 || done != METADATA_SIZE) { 213 pjdlog_errno(LOG_ERR, "Unable to write metadata"); 214 goto fail; 215 } 216 217 return (0); 218fail: 219 free(buf); 220 nv_free(nv); 221 return (-1); 222} 223