2c59e5d543
MFC after: 3 days
226 lines
6.4 KiB
C
226 lines
6.4 KiB
C
/*-
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* Copyright (c) 2009-2010 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Pawel Jakub Dawidek under sponsorship from
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* the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <strings.h>
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#include <unistd.h>
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#include <ebuf.h>
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#include <nv.h>
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#include <pjdlog.h>
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#include <subr.h>
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#include "metadata.h"
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int
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metadata_read(struct hast_resource *res, bool openrw)
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{
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unsigned char *buf;
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struct ebuf *eb;
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struct nv *nv;
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ssize_t done;
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const char *str;
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int rerrno;
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bool opened_here;
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opened_here = false;
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rerrno = 0;
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/*
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* Is this first metadata_read() call for this resource?
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*/
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if (res->hr_localfd == -1) {
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if (provinfo(res, openrw) < 0) {
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rerrno = errno;
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goto fail;
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}
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opened_here = true;
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pjdlog_debug(1, "Obtained info about %s.", res->hr_localpath);
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if (openrw) {
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if (flock(res->hr_localfd, LOCK_EX | LOCK_NB) < 0) {
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rerrno = errno;
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if (errno == EOPNOTSUPP) {
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pjdlog_warning("Unable to lock %s (operation not supported), but continuing.",
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res->hr_localpath);
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} else {
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pjdlog_errno(LOG_ERR,
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"Unable to lock %s",
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res->hr_localpath);
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goto fail;
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}
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}
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pjdlog_debug(1, "Locked %s.", res->hr_localpath);
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}
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}
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eb = ebuf_alloc(METADATA_SIZE);
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if (eb == NULL) {
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rerrno = errno;
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pjdlog_errno(LOG_ERR,
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"Unable to allocate memory to read metadata");
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goto fail;
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}
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if (ebuf_add_tail(eb, NULL, METADATA_SIZE) < 0) {
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rerrno = errno;
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pjdlog_errno(LOG_ERR,
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"Unable to allocate memory to read metadata");
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ebuf_free(eb);
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goto fail;
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}
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buf = ebuf_data(eb, NULL);
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PJDLOG_ASSERT(buf != NULL);
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done = pread(res->hr_localfd, buf, METADATA_SIZE, 0);
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if (done < 0 || done != METADATA_SIZE) {
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rerrno = errno;
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pjdlog_errno(LOG_ERR, "Unable to read metadata");
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ebuf_free(eb);
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goto fail;
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}
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nv = nv_ntoh(eb);
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if (nv == NULL) {
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rerrno = errno;
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pjdlog_errno(LOG_ERR, "Metadata read from %s is invalid",
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res->hr_localpath);
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ebuf_free(eb);
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goto fail;
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}
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str = nv_get_string(nv, "resource");
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if (str != NULL && strcmp(str, res->hr_name) != 0) {
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pjdlog_error("Provider %s is not part of resource %s.",
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res->hr_localpath, res->hr_name);
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nv_free(nv);
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goto fail;
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}
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res->hr_datasize = nv_get_uint64(nv, "datasize");
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res->hr_extentsize = (int)nv_get_uint32(nv, "extentsize");
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res->hr_keepdirty = (int)nv_get_uint32(nv, "keepdirty");
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res->hr_localoff = nv_get_uint64(nv, "offset");
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res->hr_resuid = nv_get_uint64(nv, "resuid");
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if (res->hr_role != HAST_ROLE_PRIMARY) {
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/* Secondary or init role. */
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res->hr_secondary_localcnt = nv_get_uint64(nv, "localcnt");
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res->hr_secondary_remotecnt = nv_get_uint64(nv, "remotecnt");
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}
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if (res->hr_role != HAST_ROLE_SECONDARY) {
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/* Primary or init role. */
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res->hr_primary_localcnt = nv_get_uint64(nv, "localcnt");
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res->hr_primary_remotecnt = nv_get_uint64(nv, "remotecnt");
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}
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str = nv_get_string(nv, "prevrole");
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if (str != NULL) {
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if (strcmp(str, "primary") == 0)
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res->hr_previous_role = HAST_ROLE_PRIMARY;
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else if (strcmp(str, "secondary") == 0)
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res->hr_previous_role = HAST_ROLE_SECONDARY;
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}
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if (nv_error(nv) != 0) {
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errno = rerrno = nv_error(nv);
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pjdlog_errno(LOG_ERR, "Unable to read metadata from %s",
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res->hr_localpath);
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nv_free(nv);
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goto fail;
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}
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nv_free(nv);
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return (0);
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fail:
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if (opened_here) {
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close(res->hr_localfd);
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res->hr_localfd = -1;
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}
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errno = rerrno;
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return (-1);
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}
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int
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metadata_write(struct hast_resource *res)
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{
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struct ebuf *eb;
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struct nv *nv;
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unsigned char *buf, *ptr;
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size_t size;
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ssize_t done;
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int ret;
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buf = calloc(1, METADATA_SIZE);
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if (buf == NULL) {
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pjdlog_error("Unable to allocate %zu bytes for metadata.",
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(size_t)METADATA_SIZE);
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return (-1);
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}
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ret = -1;
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nv = nv_alloc();
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nv_add_string(nv, res->hr_name, "resource");
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nv_add_uint64(nv, (uint64_t)res->hr_datasize, "datasize");
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nv_add_uint32(nv, (uint32_t)res->hr_extentsize, "extentsize");
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nv_add_uint32(nv, (uint32_t)res->hr_keepdirty, "keepdirty");
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nv_add_uint64(nv, (uint64_t)res->hr_localoff, "offset");
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nv_add_uint64(nv, res->hr_resuid, "resuid");
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if (res->hr_role == HAST_ROLE_PRIMARY ||
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res->hr_role == HAST_ROLE_INIT) {
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nv_add_uint64(nv, res->hr_primary_localcnt, "localcnt");
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nv_add_uint64(nv, res->hr_primary_remotecnt, "remotecnt");
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} else /* if (res->hr_role == HAST_ROLE_SECONDARY) */ {
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PJDLOG_ASSERT(res->hr_role == HAST_ROLE_SECONDARY);
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nv_add_uint64(nv, res->hr_secondary_localcnt, "localcnt");
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nv_add_uint64(nv, res->hr_secondary_remotecnt, "remotecnt");
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}
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nv_add_string(nv, role2str(res->hr_role), "prevrole");
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if (nv_error(nv) != 0) {
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pjdlog_error("Unable to create metadata.");
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goto end;
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}
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res->hr_previous_role = res->hr_role;
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eb = nv_hton(nv);
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PJDLOG_ASSERT(eb != NULL);
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ptr = ebuf_data(eb, &size);
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PJDLOG_ASSERT(ptr != NULL);
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PJDLOG_ASSERT(size < METADATA_SIZE);
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bcopy(ptr, buf, size);
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done = pwrite(res->hr_localfd, buf, METADATA_SIZE, 0);
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if (done < 0 || done != METADATA_SIZE) {
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pjdlog_errno(LOG_ERR, "Unable to write metadata");
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goto end;
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}
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ret = 0;
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end:
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free(buf);
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nv_free(nv);
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return (ret);
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}
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