/*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2009-2010 The FreeBSD Foundation * All rights reserved. * * This software was developed by Pawel Jakub Dawidek under sponsorship from * the FreeBSD Foundation. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include #include #include "metadata.h" int metadata_read(struct hast_resource *res, bool openrw) { unsigned char *buf; struct ebuf *eb; struct nv *nv; ssize_t done; const char *str; int rerrno; bool opened_here; opened_here = false; rerrno = 0; /* * Is this first metadata_read() call for this resource? */ if (res->hr_localfd == -1) { if (provinfo(res, openrw) == -1) { rerrno = errno; goto fail; } opened_here = true; pjdlog_debug(1, "Obtained info about %s.", res->hr_localpath); if (openrw) { if (flock(res->hr_localfd, LOCK_EX | LOCK_NB) == -1) { rerrno = errno; if (errno == EOPNOTSUPP) { pjdlog_warning("Unable to lock %s (operation not supported), but continuing.", res->hr_localpath); } else { pjdlog_errno(LOG_ERR, "Unable to lock %s", res->hr_localpath); goto fail; } } pjdlog_debug(1, "Locked %s.", res->hr_localpath); } } eb = ebuf_alloc(METADATA_SIZE); if (eb == NULL) { rerrno = errno; pjdlog_errno(LOG_ERR, "Unable to allocate memory to read metadata"); goto fail; } if (ebuf_add_tail(eb, NULL, METADATA_SIZE) == -1) { rerrno = errno; pjdlog_errno(LOG_ERR, "Unable to allocate memory to read metadata"); ebuf_free(eb); goto fail; } buf = ebuf_data(eb, NULL); PJDLOG_ASSERT(buf != NULL); done = pread(res->hr_localfd, buf, METADATA_SIZE, 0); if (done == -1 || done != METADATA_SIZE) { rerrno = errno; pjdlog_errno(LOG_ERR, "Unable to read metadata"); ebuf_free(eb); goto fail; } nv = nv_ntoh(eb); if (nv == NULL) { rerrno = errno; pjdlog_errno(LOG_ERR, "Metadata read from %s is invalid", res->hr_localpath); ebuf_free(eb); goto fail; } str = nv_get_string(nv, "resource"); if (str != NULL && strcmp(str, res->hr_name) != 0) { pjdlog_error("Provider %s is not part of resource %s.", res->hr_localpath, res->hr_name); nv_free(nv); goto fail; } res->hr_datasize = nv_get_uint64(nv, "datasize"); res->hr_extentsize = (int)nv_get_uint32(nv, "extentsize"); res->hr_keepdirty = (int)nv_get_uint32(nv, "keepdirty"); res->hr_localoff = nv_get_uint64(nv, "offset"); res->hr_resuid = nv_get_uint64(nv, "resuid"); if (res->hr_role != HAST_ROLE_PRIMARY) { /* Secondary or init role. */ res->hr_secondary_localcnt = nv_get_uint64(nv, "localcnt"); res->hr_secondary_remotecnt = nv_get_uint64(nv, "remotecnt"); } if (res->hr_role != HAST_ROLE_SECONDARY) { /* Primary or init role. */ res->hr_primary_localcnt = nv_get_uint64(nv, "localcnt"); res->hr_primary_remotecnt = nv_get_uint64(nv, "remotecnt"); } str = nv_get_string(nv, "prevrole"); if (str != NULL) { if (strcmp(str, "primary") == 0) res->hr_previous_role = HAST_ROLE_PRIMARY; else if (strcmp(str, "secondary") == 0) res->hr_previous_role = HAST_ROLE_SECONDARY; } if (nv_error(nv) != 0) { errno = rerrno = nv_error(nv); pjdlog_errno(LOG_ERR, "Unable to read metadata from %s", res->hr_localpath); nv_free(nv); goto fail; } nv_free(nv); return (0); fail: if (opened_here) { close(res->hr_localfd); res->hr_localfd = -1; } errno = rerrno; return (-1); } int metadata_write(struct hast_resource *res) { struct ebuf *eb; struct nv *nv; unsigned char *buf, *ptr; size_t size; ssize_t done; int ret; buf = calloc(1, METADATA_SIZE); if (buf == NULL) { pjdlog_error("Unable to allocate %zu bytes for metadata.", (size_t)METADATA_SIZE); return (-1); } ret = -1; nv = nv_alloc(); nv_add_string(nv, res->hr_name, "resource"); nv_add_uint64(nv, (uint64_t)res->hr_datasize, "datasize"); nv_add_uint32(nv, (uint32_t)res->hr_extentsize, "extentsize"); nv_add_uint32(nv, (uint32_t)res->hr_keepdirty, "keepdirty"); nv_add_uint64(nv, (uint64_t)res->hr_localoff, "offset"); nv_add_uint64(nv, res->hr_resuid, "resuid"); if (res->hr_role == HAST_ROLE_PRIMARY || res->hr_role == HAST_ROLE_INIT) { nv_add_uint64(nv, res->hr_primary_localcnt, "localcnt"); nv_add_uint64(nv, res->hr_primary_remotecnt, "remotecnt"); } else /* if (res->hr_role == HAST_ROLE_SECONDARY) */ { PJDLOG_ASSERT(res->hr_role == HAST_ROLE_SECONDARY); nv_add_uint64(nv, res->hr_secondary_localcnt, "localcnt"); nv_add_uint64(nv, res->hr_secondary_remotecnt, "remotecnt"); } nv_add_string(nv, role2str(res->hr_role), "prevrole"); if (nv_error(nv) != 0) { pjdlog_error("Unable to create metadata."); goto end; } res->hr_previous_role = res->hr_role; eb = nv_hton(nv); PJDLOG_ASSERT(eb != NULL); ptr = ebuf_data(eb, &size); PJDLOG_ASSERT(ptr != NULL); PJDLOG_ASSERT(size < METADATA_SIZE); bcopy(ptr, buf, size); done = pwrite(res->hr_localfd, buf, METADATA_SIZE, 0); if (done == -1 || done != METADATA_SIZE) { pjdlog_errno(LOG_ERR, "Unable to write metadata"); goto end; } ret = 0; end: free(buf); nv_free(nv); return (ret); }